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gnu / binutils-gdb / 211aafd18d10b7739a16df5cc637952fd3f508e8 / . / gdb / dwarf2 / read.c
blob: 192df2ac84374e1528e598d9bcb50e59ae8b3302 [file] [log] [blame]
/* DWARF 2 debugging format support for GDB.
Copyright (C) 1994-2021 Free Software Foundation, Inc.
Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
Inc. with support from Florida State University (under contract
with the Ada Joint Program Office), and Silicon Graphics, Inc.
Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
based on Fred Fish's (Cygnus Support) implementation of DWARF 1
support.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* FIXME: Various die-reading functions need to be more careful with
reading off the end of the section.
E.g., load_partial_dies, read_partial_die. */
#include "defs.h"
#include "dwarf2/read.h"
#include "dwarf2/abbrev.h"
#include "dwarf2/attribute.h"
#include "dwarf2/comp-unit-head.h"
#include "dwarf2/cu.h"
#include "dwarf2/index-cache.h"
#include "dwarf2/index-common.h"
#include "dwarf2/leb.h"
#include "dwarf2/line-header.h"
#include "dwarf2/dwz.h"
#include "dwarf2/macro.h"
#include "dwarf2/die.h"
#include "dwarf2/sect-names.h"
#include "dwarf2/stringify.h"
#include "dwarf2/public.h"
#include "bfd.h"
#include "elf-bfd.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "objfiles.h"
#include "dwarf2.h"
#include "demangle.h"
#include "gdb-demangle.h"
#include "filenames.h" /* for DOSish file names */
#include "language.h"
#include "complaints.h"
#include "dwarf2/expr.h"
#include "dwarf2/loc.h"
#include "cp-support.h"
#include "hashtab.h"
#include "command.h"
#include "gdbcmd.h"
#include "block.h"
#include "addrmap.h"
#include "typeprint.h"
#include "psympriv.h"
#include "c-lang.h"
#include "go-lang.h"
#include "valprint.h"
#include "gdbcore.h" /* for gnutarget */
#include "gdb/gdb-index.h"
#include "gdb_bfd.h"
#include "f-lang.h"
#include "source.h"
#include "build-id.h"
#include "namespace.h"
#include "gdbsupport/function-view.h"
#include "gdbsupport/gdb_optional.h"
#include "gdbsupport/underlying.h"
#include "gdbsupport/hash_enum.h"
#include "filename-seen-cache.h"
#include "producer.h"
#include <fcntl.h>
#include <algorithm>
#include <unordered_map>
#include "gdbsupport/selftest.h"
#include "rust-lang.h"
#include "gdbsupport/pathstuff.h"
#include "count-one-bits.h"
#include <unordered_set>
/* When == 1, print basic high level tracing messages.
When > 1, be more verbose.
This is in contrast to the low level DIE reading of dwarf_die_debug. */
static unsigned int dwarf_read_debug = 0;
/* Print a "dwarf-read" debug statement if dwarf_read_debug is >= 1. */
#define dwarf_read_debug_printf(fmt, ...) \
debug_prefixed_printf_cond (dwarf_read_debug >= 1, "dwarf-read", fmt, \
##__VA_ARGS__)
/* Print a "dwarf-read" debug statement if dwarf_read_debug is >= 2. */
#define dwarf_read_debug_printf_v(fmt, ...) \
debug_prefixed_printf_cond (dwarf_read_debug >= 2, "dwarf-read", fmt, \
##__VA_ARGS__)
/* When non-zero, dump DIEs after they are read in. */
static unsigned int dwarf_die_debug = 0;
/* When non-zero, dump line number entries as they are read in. */
unsigned int dwarf_line_debug = 0;
/* When true, cross-check physname against demangler. */
static bool check_physname = false;
/* When true, do not reject deprecated .gdb_index sections. */
static bool use_deprecated_index_sections = false;
/* This is used to store the data that is always per objfile. */
static const objfile_key<dwarf2_per_objfile> dwarf2_objfile_data_key;
/* These are used to store the dwarf2_per_bfd objects.
objfiles having the same BFD, which doesn't require relocations, are going to
share a dwarf2_per_bfd object, which is held in the _bfd_data_key version.
Other objfiles are not going to share a dwarf2_per_bfd with any other
objfiles, so they'll have their own version kept in the _objfile_data_key
version. */
static const struct bfd_key<dwarf2_per_bfd> dwarf2_per_bfd_bfd_data_key;
static const struct objfile_key<dwarf2_per_bfd> dwarf2_per_bfd_objfile_data_key;
/* The "aclass" indices for various kinds of computed DWARF symbols. */
static int dwarf2_locexpr_index;
static int dwarf2_loclist_index;
static int dwarf2_locexpr_block_index;
static int dwarf2_loclist_block_index;
/* Size of .debug_loclists section header for 32-bit DWARF format. */
#define LOCLIST_HEADER_SIZE32 12
/* Size of .debug_loclists section header for 64-bit DWARF format. */
#define LOCLIST_HEADER_SIZE64 20
/* Size of .debug_rnglists section header for 32-bit DWARF format. */
#define RNGLIST_HEADER_SIZE32 12
/* Size of .debug_rnglists section header for 64-bit DWARF format. */
#define RNGLIST_HEADER_SIZE64 20
/* An index into a (C++) symbol name component in a symbol name as
recorded in the mapped_index's symbol table. For each C++ symbol
in the symbol table, we record one entry for the start of each
component in the symbol in a table of name components, and then
sort the table, in order to be able to binary search symbol names,
ignoring leading namespaces, both completion and regular look up.
For example, for symbol "A::B::C", we'll have an entry that points
to "A::B::C", another that points to "B::C", and another for "C".
Note that function symbols in GDB index have no parameter
information, just the function/method names. You can convert a
name_component to a "const char *" using the
'mapped_index::symbol_name_at(offset_type)' method. */
struct name_component
{
/* Offset in the symbol name where the component starts. Stored as
a (32-bit) offset instead of a pointer to save memory and improve
locality on 64-bit architectures. */
offset_type name_offset;
/* The symbol's index in the symbol and constant pool tables of a
mapped_index. */
offset_type idx;
};
/* Base class containing bits shared by both .gdb_index and
.debug_name indexes. */
struct mapped_index_base
{
mapped_index_base () = default;
DISABLE_COPY_AND_ASSIGN (mapped_index_base);
/* The name_component table (a sorted vector). See name_component's
description above. */
std::vector<name_component> name_components;
/* How NAME_COMPONENTS is sorted. */
enum case_sensitivity name_components_casing;
/* Return the number of names in the symbol table. */
virtual size_t symbol_name_count () const = 0;
/* Get the name of the symbol at IDX in the symbol table. */
virtual const char *symbol_name_at
(offset_type idx, dwarf2_per_objfile *per_objfile) const = 0;
/* Return whether the name at IDX in the symbol table should be
ignored. */
virtual bool symbol_name_slot_invalid (offset_type idx) const
{
return false;
}
/* Build the symbol name component sorted vector, if we haven't
yet. */
void build_name_components (dwarf2_per_objfile *per_objfile);
/* Returns the lower (inclusive) and upper (exclusive) bounds of the
possible matches for LN_NO_PARAMS in the name component
vector. */
std::pair<std::vector<name_component>::const_iterator,
std::vector<name_component>::const_iterator>
find_name_components_bounds (const lookup_name_info &ln_no_params,
enum language lang,
dwarf2_per_objfile *per_objfile) const;
/* Prevent deleting/destroying via a base class pointer. */
protected:
~mapped_index_base() = default;
};
/* This is a view into the index that converts from bytes to an
offset_type, and allows indexing. Unaligned bytes are specifically
allowed here, and handled via unpacking. */
class offset_view
{
public:
offset_view () = default;
explicit offset_view (gdb::array_view<const gdb_byte> bytes)
: m_bytes (bytes)
{
}
/* Extract the INDEXth offset_type from the array. */
offset_type operator[] (size_t index) const
{
const gdb_byte *bytes = &m_bytes[index * sizeof (offset_type)];
return (offset_type) extract_unsigned_integer (bytes,
sizeof (offset_type),
BFD_ENDIAN_LITTLE);
}
/* Return the number of offset_types in this array. */
size_t size () const
{
return m_bytes.size () / sizeof (offset_type);
}
/* Return true if this view is empty. */
bool empty () const
{
return m_bytes.empty ();
}
private:
/* The underlying bytes. */
gdb::array_view<const gdb_byte> m_bytes;
};
/* A description of the mapped index. The file format is described in
a comment by the code that writes the index. */
struct mapped_index final : public mapped_index_base
{
/* Index data format version. */
int version = 0;
/* The address table data. */
gdb::array_view<const gdb_byte> address_table;
/* The symbol table, implemented as a hash table. */
offset_view symbol_table;
/* A pointer to the constant pool. */
gdb::array_view<const gdb_byte> constant_pool;
/* Return the index into the constant pool of the name of the IDXth
symbol in the symbol table. */
offset_type symbol_name_index (offset_type idx) const
{
return symbol_table[2 * idx];
}
/* Return the index into the constant pool of the CU vector of the
IDXth symbol in the symbol table. */
offset_type symbol_vec_index (offset_type idx) const
{
return symbol_table[2 * idx + 1];
}
bool symbol_name_slot_invalid (offset_type idx) const override
{
return (symbol_name_index (idx) == 0
&& symbol_vec_index (idx) == 0);
}
/* Convenience method to get at the name of the symbol at IDX in the
symbol table. */
const char *symbol_name_at
(offset_type idx, dwarf2_per_objfile *per_objfile) const override
{
return (const char *) (this->constant_pool.data ()
+ symbol_name_index (idx));
}
size_t symbol_name_count () const override
{ return this->symbol_table.size () / 2; }
};
/* A description of the mapped .debug_names.
Uninitialized map has CU_COUNT 0. */
struct mapped_debug_names final : public mapped_index_base
{
bfd_endian dwarf5_byte_order;
bool dwarf5_is_dwarf64;
bool augmentation_is_gdb;
uint8_t offset_size;
uint32_t cu_count = 0;
uint32_t tu_count, bucket_count, name_count;
const gdb_byte *cu_table_reordered, *tu_table_reordered;
const uint32_t *bucket_table_reordered, *hash_table_reordered;
const gdb_byte *name_table_string_offs_reordered;
const gdb_byte *name_table_entry_offs_reordered;
const gdb_byte *entry_pool;
struct index_val
{
ULONGEST dwarf_tag;
struct attr
{
/* Attribute name DW_IDX_*. */
ULONGEST dw_idx;
/* Attribute form DW_FORM_*. */
ULONGEST form;
/* Value if FORM is DW_FORM_implicit_const. */
LONGEST implicit_const;
};
std::vector<attr> attr_vec;
};
std::unordered_map<ULONGEST, index_val> abbrev_map;
const char *namei_to_name
(uint32_t namei, dwarf2_per_objfile *per_objfile) const;
/* Implementation of the mapped_index_base virtual interface, for
the name_components cache. */
const char *symbol_name_at
(offset_type idx, dwarf2_per_objfile *per_objfile) const override
{ return namei_to_name (idx, per_objfile); }
size_t symbol_name_count () const override
{ return this->name_count; }
};
/* See dwarf2read.h. */
dwarf2_per_objfile *
get_dwarf2_per_objfile (struct objfile *objfile)
{
return dwarf2_objfile_data_key.get (objfile);
}
/* Default names of the debugging sections. */
/* Note that if the debugging section has been compressed, it might
have a name like .zdebug_info. */
const struct dwarf2_debug_sections dwarf2_elf_names =
{
{ ".debug_info", ".zdebug_info" },
{ ".debug_abbrev", ".zdebug_abbrev" },
{ ".debug_line", ".zdebug_line" },
{ ".debug_loc", ".zdebug_loc" },
{ ".debug_loclists", ".zdebug_loclists" },
{ ".debug_macinfo", ".zdebug_macinfo" },
{ ".debug_macro", ".zdebug_macro" },
{ ".debug_str", ".zdebug_str" },
{ ".debug_str_offsets", ".zdebug_str_offsets" },
{ ".debug_line_str", ".zdebug_line_str" },
{ ".debug_ranges", ".zdebug_ranges" },
{ ".debug_rnglists", ".zdebug_rnglists" },
{ ".debug_types", ".zdebug_types" },
{ ".debug_addr", ".zdebug_addr" },
{ ".debug_frame", ".zdebug_frame" },
{ ".eh_frame", NULL },
{ ".gdb_index", ".zgdb_index" },
{ ".debug_names", ".zdebug_names" },
{ ".debug_aranges", ".zdebug_aranges" },
23
};
/* List of DWO/DWP sections. */
static const struct dwop_section_names
{
struct dwarf2_section_names abbrev_dwo;
struct dwarf2_section_names info_dwo;
struct dwarf2_section_names line_dwo;
struct dwarf2_section_names loc_dwo;
struct dwarf2_section_names loclists_dwo;
struct dwarf2_section_names macinfo_dwo;
struct dwarf2_section_names macro_dwo;
struct dwarf2_section_names rnglists_dwo;
struct dwarf2_section_names str_dwo;
struct dwarf2_section_names str_offsets_dwo;
struct dwarf2_section_names types_dwo;
struct dwarf2_section_names cu_index;
struct dwarf2_section_names tu_index;
}
dwop_section_names =
{
{ ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
{ ".debug_info.dwo", ".zdebug_info.dwo" },
{ ".debug_line.dwo", ".zdebug_line.dwo" },
{ ".debug_loc.dwo", ".zdebug_loc.dwo" },
{ ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
{ ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
{ ".debug_macro.dwo", ".zdebug_macro.dwo" },
{ ".debug_rnglists.dwo", ".zdebug_rnglists.dwo" },
{ ".debug_str.dwo", ".zdebug_str.dwo" },
{ ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
{ ".debug_types.dwo", ".zdebug_types.dwo" },
{ ".debug_cu_index", ".zdebug_cu_index" },
{ ".debug_tu_index", ".zdebug_tu_index" },
};
/* local data types */
/* The location list and range list sections (.debug_loclists & .debug_rnglists)
begin with a header, which contains the following information. */
struct loclists_rnglists_header
{
/* A 4-byte or 12-byte length containing the length of the
set of entries for this compilation unit, not including the
length field itself. */
unsigned int length;
/* A 2-byte version identifier. */
short version;
/* A 1-byte unsigned integer containing the size in bytes of an address on
the target system. */
unsigned char addr_size;
/* A 1-byte unsigned integer containing the size in bytes of a segment selector
on the target system. */
unsigned char segment_collector_size;
/* A 4-byte count of the number of offsets that follow the header. */
unsigned int offset_entry_count;
};
/* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
This includes type_unit_group and quick_file_names. */
struct stmt_list_hash
{
/* The DWO unit this table is from or NULL if there is none. */
struct dwo_unit *dwo_unit;
/* Offset in .debug_line or .debug_line.dwo. */
sect_offset line_sect_off;
};
/* Each element of dwarf2_per_bfd->type_unit_groups is a pointer to
an object of this type. This contains elements of type unit groups
that can be shared across objfiles. The non-shareable parts are in
type_unit_group_unshareable. */
struct type_unit_group : public dwarf2_per_cu_data
{
/* The TUs that share this DW_AT_stmt_list entry.
This is added to while parsing type units to build partial symtabs,
and is deleted afterwards and not used again. */
std::vector<signatured_type *> *tus = nullptr;
/* The data used to construct the hash key. */
struct stmt_list_hash hash {};
};
/* These sections are what may appear in a (real or virtual) DWO file. */
struct dwo_sections
{
struct dwarf2_section_info abbrev;
struct dwarf2_section_info line;
struct dwarf2_section_info loc;
struct dwarf2_section_info loclists;
struct dwarf2_section_info macinfo;
struct dwarf2_section_info macro;
struct dwarf2_section_info rnglists;
struct dwarf2_section_info str;
struct dwarf2_section_info str_offsets;
/* In the case of a virtual DWO file, these two are unused. */
struct dwarf2_section_info info;
std::vector<dwarf2_section_info> types;
};
/* CUs/TUs in DWP/DWO files. */
struct dwo_unit
{
/* Backlink to the containing struct dwo_file. */
struct dwo_file *dwo_file;
/* The "id" that distinguishes this CU/TU.
.debug_info calls this "dwo_id", .debug_types calls this "signature".
Since signatures came first, we stick with it for consistency. */
ULONGEST signature;
/* The section this CU/TU lives in, in the DWO file. */
struct dwarf2_section_info *section;
/* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
sect_offset sect_off;
unsigned int length;
/* For types, offset in the type's DIE of the type defined by this TU. */
cu_offset type_offset_in_tu;
};
/* include/dwarf2.h defines the DWP section codes.
It defines a max value but it doesn't define a min value, which we
use for error checking, so provide one. */
enum dwp_v2_section_ids
{
DW_SECT_MIN = 1
};
/* Data for one DWO file.
This includes virtual DWO files (a virtual DWO file is a DWO file as it
appears in a DWP file). DWP files don't really have DWO files per se -
comdat folding of types "loses" the DWO file they came from, and from
a high level view DWP files appear to contain a mass of random types.
However, to maintain consistency with the non-DWP case we pretend DWP
files contain virtual DWO files, and we assign each TU with one virtual
DWO file (generally based on the line and abbrev section offsets -
a heuristic that seems to work in practice). */
struct dwo_file
{
dwo_file () = default;
DISABLE_COPY_AND_ASSIGN (dwo_file);
/* The DW_AT_GNU_dwo_name or DW_AT_dwo_name attribute.
For virtual DWO files the name is constructed from the section offsets
of abbrev,line,loc,str_offsets so that we combine virtual DWO files
from related CU+TUs. */
const char *dwo_name = nullptr;
/* The DW_AT_comp_dir attribute. */
const char *comp_dir = nullptr;
/* The bfd, when the file is open. Otherwise this is NULL.
This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
gdb_bfd_ref_ptr dbfd;
/* The sections that make up this DWO file.
Remember that for virtual DWO files in DWP V2 or DWP V5, these are virtual
sections (for lack of a better name). */
struct dwo_sections sections {};
/* The CUs in the file.
Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
an extension to handle LLVM's Link Time Optimization output (where
multiple source files may be compiled into a single object/dwo pair). */
htab_up cus;
/* Table of TUs in the file.
Each element is a struct dwo_unit. */
htab_up tus;
};
/* These sections are what may appear in a DWP file. */
struct dwp_sections
{
/* These are used by all DWP versions (1, 2 and 5). */
struct dwarf2_section_info str;
struct dwarf2_section_info cu_index;
struct dwarf2_section_info tu_index;
/* These are only used by DWP version 2 and version 5 files.
In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
sections are referenced by section number, and are not recorded here.
In DWP version 2 or 5 there is at most one copy of all these sections,
each section being (effectively) comprised of the concatenation of all of
the individual sections that exist in the version 1 format.
To keep the code simple we treat each of these concatenated pieces as a
section itself (a virtual section?). */
struct dwarf2_section_info abbrev;
struct dwarf2_section_info info;
struct dwarf2_section_info line;
struct dwarf2_section_info loc;
struct dwarf2_section_info loclists;
struct dwarf2_section_info macinfo;
struct dwarf2_section_info macro;
struct dwarf2_section_info rnglists;
struct dwarf2_section_info str_offsets;
struct dwarf2_section_info types;
};
/* These sections are what may appear in a virtual DWO file in DWP version 1.
A virtual DWO file is a DWO file as it appears in a DWP file. */
struct virtual_v1_dwo_sections
{
struct dwarf2_section_info abbrev;
struct dwarf2_section_info line;
struct dwarf2_section_info loc;
struct dwarf2_section_info macinfo;
struct dwarf2_section_info macro;
struct dwarf2_section_info str_offsets;
/* Each DWP hash table entry records one CU or one TU.
That is recorded here, and copied to dwo_unit.section. */
struct dwarf2_section_info info_or_types;
};
/* Similar to virtual_v1_dwo_sections, but for DWP version 2 or 5.
In version 2, the sections of the DWO files are concatenated together
and stored in one section of that name. Thus each ELF section contains
several "virtual" sections. */
struct virtual_v2_or_v5_dwo_sections
{
bfd_size_type abbrev_offset;
bfd_size_type abbrev_size;
bfd_size_type line_offset;
bfd_size_type line_size;
bfd_size_type loc_offset;
bfd_size_type loc_size;
bfd_size_type loclists_offset;
bfd_size_type loclists_size;
bfd_size_type macinfo_offset;
bfd_size_type macinfo_size;
bfd_size_type macro_offset;
bfd_size_type macro_size;
bfd_size_type rnglists_offset;
bfd_size_type rnglists_size;
bfd_size_type str_offsets_offset;
bfd_size_type str_offsets_size;
/* Each DWP hash table entry records one CU or one TU.
That is recorded here, and copied to dwo_unit.section. */
bfd_size_type info_or_types_offset;
bfd_size_type info_or_types_size;
};
/* Contents of DWP hash tables. */
struct dwp_hash_table
{
uint32_t version, nr_columns;
uint32_t nr_units, nr_slots;
const gdb_byte *hash_table, *unit_table;
union
{
struct
{
const gdb_byte *indices;
} v1;
struct
{
/* This is indexed by column number and gives the id of the section
in that column. */
#define MAX_NR_V2_DWO_SECTIONS \
(1 /* .debug_info or .debug_types */ \
+ 1 /* .debug_abbrev */ \
+ 1 /* .debug_line */ \
+ 1 /* .debug_loc */ \
+ 1 /* .debug_str_offsets */ \
+ 1 /* .debug_macro or .debug_macinfo */)
int section_ids[MAX_NR_V2_DWO_SECTIONS];
const gdb_byte *offsets;
const gdb_byte *sizes;
} v2;
struct
{
/* This is indexed by column number and gives the id of the section
in that column. */
#define MAX_NR_V5_DWO_SECTIONS \
(1 /* .debug_info */ \
+ 1 /* .debug_abbrev */ \
+ 1 /* .debug_line */ \
+ 1 /* .debug_loclists */ \
+ 1 /* .debug_str_offsets */ \
+ 1 /* .debug_macro */ \
+ 1 /* .debug_rnglists */)
int section_ids[MAX_NR_V5_DWO_SECTIONS];
const gdb_byte *offsets;
const gdb_byte *sizes;
} v5;
} section_pool;
};
/* Data for one DWP file. */
struct dwp_file
{
dwp_file (const char *name_, gdb_bfd_ref_ptr &&abfd)
: name (name_),
dbfd (std::move (abfd))
{
}
/* Name of the file. */
const char *name;
/* File format version. */
int version = 0;
/* The bfd. */
gdb_bfd_ref_ptr dbfd;
/* Section info for this file. */
struct dwp_sections sections {};
/* Table of CUs in the file. */
const struct dwp_hash_table *cus = nullptr;
/* Table of TUs in the file. */
const struct dwp_hash_table *tus = nullptr;
/* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
htab_up loaded_cus;
htab_up loaded_tus;
/* Table to map ELF section numbers to their sections.
This is only needed for the DWP V1 file format. */
unsigned int num_sections = 0;
asection **elf_sections = nullptr;
};
/* Struct used to pass misc. parameters to read_die_and_children, et
al. which are used for both .debug_info and .debug_types dies.
All parameters here are unchanging for the life of the call. This
struct exists to abstract away the constant parameters of die reading. */
struct die_reader_specs
{
/* The bfd of die_section. */
bfd *abfd;
/* The CU of the DIE we are parsing. */
struct dwarf2_cu *cu;
/* Non-NULL if reading a DWO file (including one packaged into a DWP). */
struct dwo_file *dwo_file;
/* The section the die comes from.
This is either .debug_info or .debug_types, or the .dwo variants. */
struct dwarf2_section_info *die_section;
/* die_section->buffer. */
const gdb_byte *buffer;
/* The end of the buffer. */
const gdb_byte *buffer_end;
/* The abbreviation table to use when reading the DIEs. */
struct abbrev_table *abbrev_table;
};
/* A subclass of die_reader_specs that holds storage and has complex
constructor and destructor behavior. */
class cutu_reader : public die_reader_specs
{
public:
cutu_reader (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
struct abbrev_table *abbrev_table,
dwarf2_cu *existing_cu,
bool skip_partial);
explicit cutu_reader (struct dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
struct dwarf2_cu *parent_cu = nullptr,
struct dwo_file *dwo_file = nullptr);
DISABLE_COPY_AND_ASSIGN (cutu_reader);
const gdb_byte *info_ptr = nullptr;
struct die_info *comp_unit_die = nullptr;
bool dummy_p = false;
/* Release the new CU, putting it on the chain. This cannot be done
for dummy CUs. */
void keep ();
private:
void init_tu_and_read_dwo_dies (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
dwarf2_cu *existing_cu);
struct dwarf2_per_cu_data *m_this_cu;
std::unique_ptr<dwarf2_cu> m_new_cu;
/* The ordinary abbreviation table. */
abbrev_table_up m_abbrev_table_holder;
/* The DWO abbreviation table. */
abbrev_table_up m_dwo_abbrev_table;
};
/* When we construct a partial symbol table entry we only
need this much information. */
struct partial_die_info : public allocate_on_obstack
{
partial_die_info (sect_offset sect_off, const struct abbrev_info *abbrev);
/* Disable assign but still keep copy ctor, which is needed
load_partial_dies. */
partial_die_info& operator=(const partial_die_info& rhs) = delete;
partial_die_info (const partial_die_info &) = default;
/* Adjust the partial die before generating a symbol for it. This
function may set the is_external flag or change the DIE's
name. */
void fixup (struct dwarf2_cu *cu);
/* Read a minimal amount of information into the minimal die
structure. */
const gdb_byte *read (const struct die_reader_specs *reader,
const struct abbrev_info &abbrev,
const gdb_byte *info_ptr);
/* Compute the name of this partial DIE. This memoizes the
result, so it is safe to call multiple times. */
const char *name (dwarf2_cu *cu);
/* Offset of this DIE. */
const sect_offset sect_off;
/* DWARF-2 tag for this DIE. */
const ENUM_BITFIELD(dwarf_tag) tag : 16;
/* Assorted flags describing the data found in this DIE. */
const unsigned int has_children : 1;
unsigned int is_external : 1;
unsigned int is_declaration : 1;
unsigned int has_type : 1;
unsigned int has_specification : 1;
unsigned int has_pc_info : 1;
unsigned int has_range_info : 1;
unsigned int may_be_inlined : 1;
/* This DIE has been marked DW_AT_main_subprogram. */
unsigned int main_subprogram : 1;
/* Flag set if the SCOPE field of this structure has been
computed. */
unsigned int scope_set : 1;
/* Flag set if the DIE has a byte_size attribute. */
unsigned int has_byte_size : 1;
/* Flag set if the DIE has a DW_AT_const_value attribute. */
unsigned int has_const_value : 1;
/* Flag set if any of the DIE's children are template arguments. */
unsigned int has_template_arguments : 1;
/* Flag set if fixup has been called on this die. */
unsigned int fixup_called : 1;
/* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
unsigned int is_dwz : 1;
/* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
unsigned int spec_is_dwz : 1;
unsigned int canonical_name : 1;
/* The name of this DIE. Normally the value of DW_AT_name, but
sometimes a default name for unnamed DIEs. */
const char *raw_name = nullptr;
/* The linkage name, if present. */
const char *linkage_name = nullptr;
/* The scope to prepend to our children. This is generally
allocated on the comp_unit_obstack, so will disappear
when this compilation unit leaves the cache. */
const char *scope = nullptr;
/* Some data associated with the partial DIE. The tag determines
which field is live. */
union
{
/* The location description associated with this DIE, if any. */
struct dwarf_block *locdesc;
/* The offset of an import, for DW_TAG_imported_unit. */
sect_offset sect_off;
} d {};
union
{
/* If HAS_PC_INFO, the PC range associated with this DIE. */
struct
{
CORE_ADDR lowpc = 0;
CORE_ADDR highpc = 0;
};
/* If HAS_RANGE_INFO, the ranges offset associated with this DIE. */
ULONGEST ranges_offset;
};
/* Pointer into the info_buffer (or types_buffer) pointing at the target of
DW_AT_sibling, if any. */
/* NOTE: This member isn't strictly necessary, partial_die_info::read
could return DW_AT_sibling values to its caller load_partial_dies. */
const gdb_byte *sibling = nullptr;
/* If HAS_SPECIFICATION, the offset of the DIE referred to by
DW_AT_specification (or DW_AT_abstract_origin or
DW_AT_extension). */
sect_offset spec_offset {};
/* Pointers to this DIE's parent, first child, and next sibling,
if any. */
struct partial_die_info *die_parent = nullptr;
struct partial_die_info *die_child = nullptr;
struct partial_die_info *die_sibling = nullptr;
friend struct partial_die_info *
dwarf2_cu::find_partial_die (sect_offset sect_off);
private:
/* Only need to do look up in dwarf2_cu::find_partial_die. */
partial_die_info (sect_offset sect_off)
: partial_die_info (sect_off, DW_TAG_padding, 0)
{
}
partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_,
int has_children_)
: sect_off (sect_off_), tag (tag_), has_children (has_children_)
{
is_external = 0;
is_declaration = 0;
has_type = 0;
has_specification = 0;
has_pc_info = 0;
has_range_info = 0;
may_be_inlined = 0;
main_subprogram = 0;
scope_set = 0;
has_byte_size = 0;
has_const_value = 0;
has_template_arguments = 0;
fixup_called = 0;
is_dwz = 0;
spec_is_dwz = 0;
canonical_name = 0;
}
};
/* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
but this would require a corresponding change in unpack_field_as_long
and friends. */
static int bits_per_byte = 8;
struct variant_part_builder;
/* When reading a variant, we track a bit more information about the
field, and store it in an object of this type. */
struct variant_field
{
int first_field = -1;
int last_field = -1;
/* A variant can contain other variant parts. */
std::vector<variant_part_builder> variant_parts;
/* If we see a DW_TAG_variant, then this will be set if this is the
default branch. */
bool default_branch = false;
/* If we see a DW_AT_discr_value, then this will be the discriminant
value. */
ULONGEST discriminant_value = 0;
/* If we see a DW_AT_discr_list, then this is a pointer to the list
data. */
struct dwarf_block *discr_list_data = nullptr;
};
/* This represents a DW_TAG_variant_part. */
struct variant_part_builder
{
/* The offset of the discriminant field. */
sect_offset discriminant_offset {};
/* Variants that are direct children of this variant part. */
std::vector<variant_field> variants;
/* True if we're currently reading a variant. */
bool processing_variant = false;
};
struct nextfield
{
int accessibility = 0;
int virtuality = 0;
/* Variant parts need to find the discriminant, which is a DIE
reference. We track the section offset of each field to make
this link. */
sect_offset offset;
struct field field {};
};
struct fnfieldlist
{
const char *name = nullptr;
std::vector<struct fn_field> fnfields;
};
/* The routines that read and process dies for a C struct or C++ class
pass lists of data member fields and lists of member function fields
in an instance of a field_info structure, as defined below. */
struct field_info
{
/* List of data member and baseclasses fields. */
std::vector<struct nextfield> fields;
std::vector<struct nextfield> baseclasses;
/* Set if the accessibility of one of the fields is not public. */
bool non_public_fields = false;
/* Member function fieldlist array, contains name of possibly overloaded
member function, number of overloaded member functions and a pointer
to the head of the member function field chain. */
std::vector<struct fnfieldlist> fnfieldlists;
/* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
std::vector<struct decl_field> typedef_field_list;
/* Nested types defined by this class and the number of elements in this
list. */
std::vector<struct decl_field> nested_types_list;
/* If non-null, this is the variant part we are currently
reading. */
variant_part_builder *current_variant_part = nullptr;
/* This holds all the top-level variant parts attached to the type
we're reading. */
std::vector<variant_part_builder> variant_parts;
/* Return the total number of fields (including baseclasses). */
int nfields () const
{
return fields.size () + baseclasses.size ();
}
};
/* Loaded secondary compilation units are kept in memory until they
have not been referenced for the processing of this many
compilation units. Set this to zero to disable caching. Cache
sizes of up to at least twenty will improve startup time for
typical inter-CU-reference binaries, at an obvious memory cost. */
static int dwarf_max_cache_age = 5;
static void
show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("The upper bound on the age of cached "
"DWARF compilation units is %s.\n"),
value);
}
/* local function prototypes */
static void dwarf2_find_base_address (struct die_info *die,
struct dwarf2_cu *cu);
static dwarf2_psymtab *create_partial_symtab
(dwarf2_per_cu_data *per_cu, dwarf2_per_objfile *per_objfile,
const char *name);
static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
const gdb_byte *info_ptr,
struct die_info *type_unit_die);
static void dwarf2_build_psymtabs_hard (dwarf2_per_objfile *per_objfile);
static void scan_partial_symbols (struct partial_die_info *,
CORE_ADDR *, CORE_ADDR *,
int, struct dwarf2_cu *);
static void add_partial_symbol (struct partial_die_info *,
struct dwarf2_cu *);
static void add_partial_namespace (struct partial_die_info *pdi,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
int set_addrmap, struct dwarf2_cu *cu);
static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
CORE_ADDR *highpc, int set_addrmap,
struct dwarf2_cu *cu);
static void add_partial_enumeration (struct partial_die_info *enum_pdi,
struct dwarf2_cu *cu);
static void add_partial_subprogram (struct partial_die_info *pdi,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
int need_pc, struct dwarf2_cu *cu);
static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
static struct partial_die_info *load_partial_dies
(const struct die_reader_specs *, const gdb_byte *, int);
/* A pair of partial_die_info and compilation unit. */
struct cu_partial_die_info
{
/* The compilation unit of the partial_die_info. */
struct dwarf2_cu *cu;
/* A partial_die_info. */
struct partial_die_info *pdi;
cu_partial_die_info (struct dwarf2_cu *cu, struct partial_die_info *pdi)
: cu (cu),
pdi (pdi)
{ /* Nothing. */ }
private:
cu_partial_die_info () = delete;
};
static const struct cu_partial_die_info find_partial_die (sect_offset, int,
struct dwarf2_cu *);
static const gdb_byte *read_attribute (const struct die_reader_specs *,
struct attribute *,
const struct attr_abbrev *,
const gdb_byte *);
static void read_attribute_reprocess (const struct die_reader_specs *reader,
struct attribute *attr, dwarf_tag tag);
static CORE_ADDR read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index);
static sect_offset read_abbrev_offset (dwarf2_per_objfile *per_objfile,
dwarf2_section_info *, sect_offset);
static const char *read_indirect_string
(dwarf2_per_objfile *per_objfile, bfd *, const gdb_byte *,
const struct comp_unit_head *, unsigned int *);
static const char *read_indirect_string_at_offset
(dwarf2_per_objfile *per_objfile, LONGEST str_offset);
static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
const gdb_byte *,
unsigned int *);
static const char *read_dwo_str_index (const struct die_reader_specs *reader,
ULONGEST str_index);
static const char *read_stub_str_index (struct dwarf2_cu *cu,
ULONGEST str_index);
static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
struct dwarf2_cu *);
static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
struct dwarf2_cu *cu);
static const char *dwarf2_dwo_name (struct die_info *die, struct dwarf2_cu *cu);
static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
struct dwarf2_cu *cu);
static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
static struct die_info *die_specification (struct die_info *die,
struct dwarf2_cu **);
static line_header_up dwarf_decode_line_header (sect_offset sect_off,
struct dwarf2_cu *cu);
struct file_and_directory;
static void dwarf_decode_lines (struct line_header *,
const file_and_directory &,
struct dwarf2_cu *, dwarf2_psymtab *,
CORE_ADDR, int decode_mapping);
static void dwarf2_start_subfile (struct dwarf2_cu *, const char *,
const char *);
static struct symbol *new_symbol (struct die_info *, struct type *,
struct dwarf2_cu *, struct symbol * = NULL);
static void dwarf2_const_value (const struct attribute *, struct symbol *,
struct dwarf2_cu *);
static void dwarf2_const_value_attr (const struct attribute *attr,
struct type *type,
const char *name,
struct obstack *obstack,
struct dwarf2_cu *cu, LONGEST *value,
const gdb_byte **bytes,
struct dwarf2_locexpr_baton **baton);
static struct type *read_subrange_index_type (struct die_info *die,
struct dwarf2_cu *cu);
static struct type *die_type (struct die_info *, struct dwarf2_cu *);
static int need_gnat_info (struct dwarf2_cu *);
static struct type *die_descriptive_type (struct die_info *,
struct dwarf2_cu *);
static void set_descriptive_type (struct type *, struct die_info *,
struct dwarf2_cu *);
static struct type *die_containing_type (struct die_info *,
struct dwarf2_cu *);
static struct type *lookup_die_type (struct die_info *, const struct attribute *,
struct dwarf2_cu *);
static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
static char *typename_concat (struct obstack *obs, const char *prefix,
const char *suffix, int physname,
struct dwarf2_cu *cu);
static void read_file_scope (struct die_info *, struct dwarf2_cu *);
static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
static void read_func_scope (struct die_info *, struct dwarf2_cu *);
static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
/* Return the .debug_loclists section to use for cu. */
static struct dwarf2_section_info *cu_debug_loc_section (struct dwarf2_cu *cu);
/* Return the .debug_rnglists section to use for cu. */
static struct dwarf2_section_info *cu_debug_rnglists_section
(struct dwarf2_cu *cu, dwarf_tag tag);
/* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
values. Keep the items ordered with increasing constraints compliance. */
enum pc_bounds_kind
{
/* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
PC_BOUNDS_NOT_PRESENT,
/* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
were present but they do not form a valid range of PC addresses. */
PC_BOUNDS_INVALID,
/* Discontiguous range was found - that is DW_AT_ranges was found. */
PC_BOUNDS_RANGES,
/* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
PC_BOUNDS_HIGH_LOW,
};
static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
CORE_ADDR *, CORE_ADDR *,
struct dwarf2_cu *,
dwarf2_psymtab *);
static void get_scope_pc_bounds (struct die_info *,
CORE_ADDR *, CORE_ADDR *,
struct dwarf2_cu *);
static void dwarf2_record_block_ranges (struct die_info *, struct block *,
CORE_ADDR, struct dwarf2_cu *);
static void dwarf2_add_field (struct field_info *, struct die_info *,
struct dwarf2_cu *);
static void dwarf2_attach_fields_to_type (struct field_info *,
struct type *, struct dwarf2_cu *);
static void dwarf2_add_member_fn (struct field_info *,
struct die_info *, struct type *,
struct dwarf2_cu *);
static void dwarf2_attach_fn_fields_to_type (struct field_info *,
struct type *,
struct dwarf2_cu *);
static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
static void read_common_block (struct die_info *, struct dwarf2_cu *);
static void read_namespace (struct die_info *die, struct dwarf2_cu *);
static void read_module (struct die_info *die, struct dwarf2_cu *cu);
static struct using_direct **using_directives (struct dwarf2_cu *cu);
static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
static struct type *read_module_type (struct die_info *die,
struct dwarf2_cu *cu);
static const char *namespace_name (struct die_info *die,
int *is_anonymous, struct dwarf2_cu *);
static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *,
bool * = nullptr);
static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
struct dwarf2_cu *);
static struct die_info *read_die_and_siblings_1
(const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
struct die_info *);
static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
const gdb_byte *info_ptr,
const gdb_byte **new_info_ptr,
struct die_info *parent);
static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
struct die_info **, const gdb_byte *,
int);
static const gdb_byte *read_full_die (const struct die_reader_specs *,
struct die_info **, const gdb_byte *);
static void process_die (struct die_info *, struct dwarf2_cu *);
static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
struct objfile *);
static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
static const char *dwarf2_full_name (const char *name,
struct die_info *die,
struct dwarf2_cu *cu);
static const char *dwarf2_physname (const char *name, struct die_info *die,
struct dwarf2_cu *cu);
static struct die_info *dwarf2_extension (struct die_info *die,
struct dwarf2_cu **);
static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
static void dump_die_for_error (struct die_info *);
static void dump_die_1 (struct ui_file *, int level, int max_level,
struct die_info *);
/*static*/ void dump_die (struct die_info *, int max_level);
static void store_in_ref_table (struct die_info *,
struct dwarf2_cu *);
static struct die_info *follow_die_ref_or_sig (struct die_info *,
const struct attribute *,
struct dwarf2_cu **);
static struct die_info *follow_die_ref (struct die_info *,
const struct attribute *,
struct dwarf2_cu **);
static struct die_info *follow_die_sig (struct die_info *,
const struct attribute *,
struct dwarf2_cu **);
static struct type *get_signatured_type (struct die_info *, ULONGEST,
struct dwarf2_cu *);
static struct type *get_DW_AT_signature_type (struct die_info *,
const struct attribute *,
struct dwarf2_cu *);
static void load_full_type_unit (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile);
static void read_signatured_type (signatured_type *sig_type,
dwarf2_per_objfile *per_objfile);
static int attr_to_dynamic_prop (const struct attribute *attr,
struct die_info *die, struct dwarf2_cu *cu,
struct dynamic_prop *prop, struct type *type);
/* memory allocation interface */
static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
static void fill_in_loclist_baton (struct dwarf2_cu *cu,
struct dwarf2_loclist_baton *baton,
const struct attribute *attr);
static void dwarf2_symbol_mark_computed (const struct attribute *attr,
struct symbol *sym,
struct dwarf2_cu *cu,
int is_block);
static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
const gdb_byte *info_ptr,
const struct abbrev_info *abbrev);
static hashval_t partial_die_hash (const void *item);
static int partial_die_eq (const void *item_lhs, const void *item_rhs);
static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
(sect_offset sect_off, unsigned int offset_in_dwz,
dwarf2_per_objfile *per_objfile);
static void prepare_one_comp_unit (struct dwarf2_cu *cu,
struct die_info *comp_unit_die,
enum language pretend_language);
static struct type *set_die_type (struct die_info *, struct type *,
struct dwarf2_cu *, bool = false);
static void create_all_comp_units (dwarf2_per_objfile *per_objfile);
static void load_full_comp_unit (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
dwarf2_cu *existing_cu,
bool skip_partial,
enum language pretend_language);
static void process_full_comp_unit (dwarf2_cu *cu,
enum language pretend_language);
static void process_full_type_unit (dwarf2_cu *cu,
enum language pretend_language);
static struct type *get_die_type_at_offset (sect_offset,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile);
static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
static void queue_comp_unit (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
enum language pretend_language);
static void process_queue (dwarf2_per_objfile *per_objfile);
/* Class, the destructor of which frees all allocated queue entries. This
will only have work to do if an error was thrown while processing the
dwarf. If no error was thrown then the queue entries should have all
been processed, and freed, as we went along. */
class dwarf2_queue_guard
{
public:
explicit dwarf2_queue_guard (dwarf2_per_objfile *per_objfile)
: m_per_objfile (per_objfile)
{
gdb_assert (!m_per_objfile->per_bfd->queue.has_value ());
m_per_objfile->per_bfd->queue.emplace ();
}
/* Free any entries remaining on the queue. There should only be
entries left if we hit an error while processing the dwarf. */
~dwarf2_queue_guard ()
{
gdb_assert (m_per_objfile->per_bfd->queue.has_value ());
m_per_objfile->per_bfd->queue.reset ();
}
DISABLE_COPY_AND_ASSIGN (dwarf2_queue_guard);
private:
dwarf2_per_objfile *m_per_objfile;
};
dwarf2_queue_item::~dwarf2_queue_item ()
{
/* Anything still marked queued is likely to be in an
inconsistent state, so discard it. */
if (per_cu->queued)
{
per_objfile->remove_cu (per_cu);
per_cu->queued = 0;
}
}
/* See dwarf2/read.h. */
void
dwarf2_per_cu_data_deleter::operator() (dwarf2_per_cu_data *data)
{
if (data->is_debug_types)
delete static_cast<signatured_type *> (data);
else
delete data;
}
/* The return type of find_file_and_directory. Note, the enclosed
string pointers are only valid while this object is valid. */
struct file_and_directory
{
/* The filename. This is never NULL. */
const char *name;
/* The compilation directory. NULL if not known. If we needed to
compute a new string, it will be stored in the per-BFD string
bcache; otherwise, points directly to the DW_AT_comp_dir string
attribute owned by the obstack that owns the DIE. */
const char *comp_dir;
};
static file_and_directory find_file_and_directory (struct die_info *die,
struct dwarf2_cu *cu);
static const char *compute_include_file_name
(const struct line_header *lh,
const file_entry &fe,
const file_and_directory &cu_info,
gdb::unique_xmalloc_ptr<char> *name_holder);
static htab_up allocate_signatured_type_table ();
static htab_up allocate_dwo_unit_table ();
static struct dwo_unit *lookup_dwo_unit_in_dwp
(dwarf2_per_objfile *per_objfile, struct dwp_file *dwp_file,
const char *comp_dir, ULONGEST signature, int is_debug_types);
static struct dwp_file *get_dwp_file (dwarf2_per_objfile *per_objfile);
static struct dwo_unit *lookup_dwo_comp_unit
(dwarf2_cu *cu, const char *dwo_name, const char *comp_dir,
ULONGEST signature);
static struct dwo_unit *lookup_dwo_type_unit
(dwarf2_cu *cu, const char *dwo_name, const char *comp_dir);
static void queue_and_load_all_dwo_tus (dwarf2_cu *cu);
/* A unique pointer to a dwo_file. */
typedef std::unique_ptr<struct dwo_file> dwo_file_up;
static void process_cu_includes (dwarf2_per_objfile *per_objfile);
static void check_producer (struct dwarf2_cu *cu);
/* Various complaints about symbol reading that don't abort the process. */
static void
dwarf2_debug_line_missing_file_complaint (void)
{
complaint (_(".debug_line section has line data without a file"));
}
static void
dwarf2_debug_line_missing_end_sequence_complaint (void)
{
complaint (_(".debug_line section has line "
"program sequence without an end"));
}
static void
dwarf2_complex_location_expr_complaint (void)
{
complaint (_("location expression too complex"));
}
static void
dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
int arg3)
{
complaint (_("const value length mismatch for '%s', got %d, expected %d"),
arg1, arg2, arg3);
}
static void
dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
{
complaint (_("invalid attribute class or form for '%s' in '%s'"),
arg1, arg2);
}
/* Hash function for line_header_hash. */
static hashval_t
line_header_hash (const struct line_header *ofs)
{
return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
}
/* Hash function for htab_create_alloc_ex for line_header_hash. */
static hashval_t
line_header_hash_voidp (const void *item)
{
const struct line_header *ofs = (const struct line_header *) item;
return line_header_hash (ofs);
}
/* Equality function for line_header_hash. */
static int
line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
{
const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
return (ofs_lhs->sect_off == ofs_rhs->sect_off
&& ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
}
/* An iterator for all_comp_units that is based on index. This
approach makes it possible to iterate over all_comp_units safely,
when some caller in the loop may add new units. */
class all_comp_units_iterator
{
public:
all_comp_units_iterator (dwarf2_per_bfd *per_bfd, bool start)
: m_per_bfd (per_bfd),
m_index (start ? 0 : per_bfd->all_comp_units.size ())
{
}
all_comp_units_iterator &operator++ ()
{
++m_index;
return *this;
}
dwarf2_per_cu_data *operator* () const
{
return m_per_bfd->get_cu (m_index);
}
bool operator== (const all_comp_units_iterator &other) const
{
return m_index == other.m_index;
}
bool operator!= (const all_comp_units_iterator &other) const
{
return m_index != other.m_index;
}
private:
dwarf2_per_bfd *m_per_bfd;
size_t m_index;
};
/* A range adapter for the all_comp_units_iterator. */
class all_comp_units_range
{
public:
all_comp_units_range (dwarf2_per_bfd *per_bfd)
: m_per_bfd (per_bfd)
{
}
all_comp_units_iterator begin ()
{
return all_comp_units_iterator (m_per_bfd, true);
}
all_comp_units_iterator end ()
{
return all_comp_units_iterator (m_per_bfd, false);
}
private:
dwarf2_per_bfd *m_per_bfd;
};
/* See declaration. */
dwarf2_per_bfd::dwarf2_per_bfd (bfd *obfd, const dwarf2_debug_sections *names,
bool can_copy_)
: obfd (obfd),
can_copy (can_copy_)
{
if (names == NULL)
names = &dwarf2_elf_names;
for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
locate_sections (obfd, sec, *names);
}
dwarf2_per_bfd::~dwarf2_per_bfd ()
{
for (auto &per_cu : all_comp_units)
{
per_cu->imported_symtabs_free ();
per_cu->free_cached_file_names ();
}
/* Everything else should be on this->obstack. */
}
/* See read.h. */
void
dwarf2_per_objfile::remove_all_cus ()
{
gdb_assert (!this->per_bfd->queue.has_value ());
for (auto pair : m_dwarf2_cus)
delete pair.second;
m_dwarf2_cus.clear ();
}
/* A helper class that calls free_cached_comp_units on
destruction. */
class free_cached_comp_units
{
public:
explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile)
: m_per_objfile (per_objfile)
{
}
~free_cached_comp_units ()
{
m_per_objfile->remove_all_cus ();
}
DISABLE_COPY_AND_ASSIGN (free_cached_comp_units);
private:
dwarf2_per_objfile *m_per_objfile;
};
/* See read.h. */
bool
dwarf2_per_objfile::symtab_set_p (const dwarf2_per_cu_data *per_cu) const
{
if (per_cu->index < this->m_symtabs.size ())
return this->m_symtabs[per_cu->index] != nullptr;
return false;
}
/* See read.h. */
compunit_symtab *
dwarf2_per_objfile::get_symtab (const dwarf2_per_cu_data *per_cu) const
{
if (per_cu->index < this->m_symtabs.size ())
return this->m_symtabs[per_cu->index];
return nullptr;
}
/* See read.h. */
void
dwarf2_per_objfile::set_symtab (const dwarf2_per_cu_data *per_cu,
compunit_symtab *symtab)
{
if (per_cu->index >= this->m_symtabs.size ())
this->m_symtabs.resize (per_cu->index + 1);
gdb_assert (this->m_symtabs[per_cu->index] == nullptr);
this->m_symtabs[per_cu->index] = symtab;
}
/* Try to locate the sections we need for DWARF 2 debugging
information and return true if we have enough to do something.
NAMES points to the dwarf2 section names, or is NULL if the standard
ELF names are used. CAN_COPY is true for formats where symbol
interposition is possible and so symbol values must follow copy
relocation rules. */
int
dwarf2_has_info (struct objfile *objfile,
const struct dwarf2_debug_sections *names,
bool can_copy)
{
if (objfile->flags & OBJF_READNEVER)
return 0;
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
if (per_objfile == NULL)
{
dwarf2_per_bfd *per_bfd;
/* We can share a "dwarf2_per_bfd" with other objfiles if the
BFD doesn't require relocations.
We don't share with objfiles for which -readnow was requested,
because it would complicate things when loading the same BFD with
-readnow and then without -readnow. */
if (!gdb_bfd_requires_relocations (objfile->obfd)
&& (objfile->flags & OBJF_READNOW) == 0)
{
/* See if one has been created for this BFD yet. */
per_bfd = dwarf2_per_bfd_bfd_data_key.get (objfile->obfd);
if (per_bfd == nullptr)
{
/* No, create it now. */
per_bfd = new dwarf2_per_bfd (objfile->obfd, names, can_copy);
dwarf2_per_bfd_bfd_data_key.set (objfile->obfd, per_bfd);
}
}
else
{
/* No sharing possible, create one specifically for this objfile. */
per_bfd = new dwarf2_per_bfd (objfile->obfd, names, can_copy);
dwarf2_per_bfd_objfile_data_key.set (objfile, per_bfd);
}
per_objfile = dwarf2_objfile_data_key.emplace (objfile, objfile, per_bfd);
}
return (!per_objfile->per_bfd->info.is_virtual
&& per_objfile->per_bfd->info.s.section != NULL
&& !per_objfile->per_bfd->abbrev.is_virtual
&& per_objfile->per_bfd->abbrev.s.section != NULL);
}
/* See declaration. */
void
dwarf2_per_bfd::locate_sections (bfd *abfd, asection *sectp,
const dwarf2_debug_sections &names)
{
flagword aflag = bfd_section_flags (sectp);
if ((aflag & SEC_HAS_CONTENTS) == 0)
{
}
else if (elf_section_data (sectp)->this_hdr.sh_size
> bfd_get_file_size (abfd))
{
bfd_size_type size = elf_section_data (sectp)->this_hdr.sh_size;
warning (_("Discarding section %s which has a section size (%s"
") larger than the file size [in module %s]"),
bfd_section_name (sectp), phex_nz (size, sizeof (size)),
bfd_get_filename (abfd));
}
else if (names.info.matches (sectp->name))
{
this->info.s.section = sectp;
this->info.size = bfd_section_size (sectp);
}
else if (names.abbrev.matches (sectp->name))
{
this->abbrev.s.section = sectp;
this->abbrev.size = bfd_section_size (sectp);
}
else if (names.line.matches (sectp->name))
{
this->line.s.section = sectp;
this->line.size = bfd_section_size (sectp);
}
else if (names.loc.matches (sectp->name))
{
this->loc.s.section = sectp;
this->loc.size = bfd_section_size (sectp);
}
else if (names.loclists.matches (sectp->name))
{
this->loclists.s.section = sectp;
this->loclists.size = bfd_section_size (sectp);
}
else if (names.macinfo.matches (sectp->name))
{
this->macinfo.s.section = sectp;
this->macinfo.size = bfd_section_size (sectp);
}
else if (names.macro.matches (sectp->name))
{
this->macro.s.section = sectp;
this->macro.size = bfd_section_size (sectp);
}
else if (names.str.matches (sectp->name))
{
this->str.s.section = sectp;
this->str.size = bfd_section_size (sectp);
}
else if (names.str_offsets.matches (sectp->name))
{
this->str_offsets.s.section = sectp;
this->str_offsets.size = bfd_section_size (sectp);
}
else if (names.line_str.matches (sectp->name))
{
this->line_str.s.section = sectp;
this->line_str.size = bfd_section_size (sectp);
}
else if (names.addr.matches (sectp->name))
{
this->addr.s.section = sectp;
this->addr.size = bfd_section_size (sectp);
}
else if (names.frame.matches (sectp->name))
{
this->frame.s.section = sectp;
this->frame.size = bfd_section_size (sectp);
}
else if (names.eh_frame.matches (sectp->name))
{
this->eh_frame.s.section = sectp;
this->eh_frame.size = bfd_section_size (sectp);
}
else if (names.ranges.matches (sectp->name))
{
this->ranges.s.section = sectp;
this->ranges.size = bfd_section_size (sectp);
}
else if (names.rnglists.matches (sectp->name))
{
this->rnglists.s.section = sectp;
this->rnglists.size = bfd_section_size (sectp);
}
else if (names.types.matches (sectp->name))
{
struct dwarf2_section_info type_section;
memset (&type_section, 0, sizeof (type_section));
type_section.s.section = sectp;
type_section.size = bfd_section_size (sectp);
this->types.push_back (type_section);
}
else if (names.gdb_index.matches (sectp->name))
{
this->gdb_index.s.section = sectp;
this->gdb_index.size = bfd_section_size (sectp);
}
else if (names.debug_names.matches (sectp->name))
{
this->debug_names.s.section = sectp;
this->debug_names.size = bfd_section_size (sectp);
}
else if (names.debug_aranges.matches (sectp->name))
{
this->debug_aranges.s.section = sectp;
this->debug_aranges.size = bfd_section_size (sectp);
}
if ((bfd_section_flags (sectp) & (SEC_LOAD | SEC_ALLOC))
&& bfd_section_vma (sectp) == 0)
this->has_section_at_zero = true;
}
/* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
SECTION_NAME. */
void
dwarf2_get_section_info (struct objfile *objfile,
enum dwarf2_section_enum sect,
asection **sectp, const gdb_byte **bufp,
bfd_size_type *sizep)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
struct dwarf2_section_info *info;
/* We may see an objfile without any DWARF, in which case we just
return nothing. */
if (per_objfile == NULL)
{
*sectp = NULL;
*bufp = NULL;
*sizep = 0;
return;
}
switch (sect)
{
case DWARF2_DEBUG_FRAME:
info = &per_objfile->per_bfd->frame;
break;
case DWARF2_EH_FRAME:
info = &per_objfile->per_bfd->eh_frame;
break;
default:
gdb_assert_not_reached ("unexpected section");
}
info->read (objfile);
*sectp = info->get_bfd_section ();
*bufp = info->buffer;
*sizep = info->size;
}
/* DWARF quick_symbol_functions support. */
/* TUs can share .debug_line entries, and there can be a lot more TUs than
unique line tables, so we maintain a separate table of all .debug_line
derived entries to support the sharing.
All the quick functions need is the list of file names. We discard the
line_header when we're done and don't need to record it here. */
struct quick_file_names
{
/* The data used to construct the hash key. */
struct stmt_list_hash hash;
/* The number of entries in file_names, real_names. */
unsigned int num_file_names;
/* The CU directory, as given by DW_AT_comp_dir. May be
nullptr. */
const char *comp_dir;
/* The file names from the line table, after being run through
file_full_name. */
const char **file_names;
/* The file names from the line table after being run through
gdb_realpath. These are computed lazily. */
const char **real_names;
};
/* When using the index (and thus not using psymtabs), each CU has an
object of this type. This is used to hold information needed by
the various "quick" methods. */
struct dwarf2_per_cu_quick_data
{
/* The file table. This can be NULL if there was no file table
or it's currently not read in.
NOTE: This points into dwarf2_per_objfile->per_bfd->quick_file_names_table. */
struct quick_file_names *file_names;
/* A temporary mark bit used when iterating over all CUs in
expand_symtabs_matching. */
unsigned int mark : 1;
/* True if we've tried to read the file table. There will be no
point in trying to read it again next time. */
bool files_read : 1;
};
/* A subclass of psymbol_functions that arranges to read the DWARF
partial symbols when needed. */
struct lazy_dwarf_reader : public psymbol_functions
{
using psymbol_functions::psymbol_functions;
bool can_lazily_read_symbols () override
{
return true;
}
void read_partial_symbols (struct objfile *objfile) override
{
if (dwarf2_has_info (objfile, nullptr))
dwarf2_build_psymtabs (objfile, this);
}
};
static quick_symbol_functions_up
make_lazy_dwarf_reader ()
{
return quick_symbol_functions_up (new lazy_dwarf_reader);
}
struct dwarf2_base_index_functions : public quick_symbol_functions
{
bool has_symbols (struct objfile *objfile) override;
bool has_unexpanded_symtabs (struct objfile *objfile) override;
struct symtab *find_last_source_symtab (struct objfile *objfile) override;
void forget_cached_source_info (struct objfile *objfile) override;
enum language lookup_global_symbol_language (struct objfile *objfile,
const char *name,
domain_enum domain,
bool *symbol_found_p) override
{
*symbol_found_p = false;
return language_unknown;
}
void print_stats (struct objfile *objfile, bool print_bcache) override;
void expand_all_symtabs (struct objfile *objfile) override;
struct compunit_symtab *find_pc_sect_compunit_symtab
(struct objfile *objfile, struct bound_minimal_symbol msymbol,
CORE_ADDR pc, struct obj_section *section, int warn_if_readin) override;
struct compunit_symtab *find_compunit_symtab_by_address
(struct objfile *objfile, CORE_ADDR address) override
{
return nullptr;
}
void map_symbol_filenames (struct objfile *objfile,
gdb::function_view<symbol_filename_ftype> fun,
bool need_fullname) override;
};
struct dwarf2_gdb_index : public dwarf2_base_index_functions
{
void dump (struct objfile *objfile) override;
void expand_matching_symbols
(struct objfile *,
const lookup_name_info &lookup_name,
domain_enum domain,
int global,
symbol_compare_ftype *ordered_compare) override;
bool expand_symtabs_matching
(struct objfile *objfile,
gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
const lookup_name_info *lookup_name,
gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
block_search_flags search_flags,
domain_enum domain,
enum search_domain kind) override;
};
struct dwarf2_debug_names_index : public dwarf2_base_index_functions
{
void dump (struct objfile *objfile) override;
void expand_matching_symbols
(struct objfile *,
const lookup_name_info &lookup_name,
domain_enum domain,
int global,
symbol_compare_ftype *ordered_compare) override;
bool expand_symtabs_matching
(struct objfile *objfile,
gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
const lookup_name_info *lookup_name,
gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
block_search_flags search_flags,
domain_enum domain,
enum search_domain kind) override;
};
static quick_symbol_functions_up
make_dwarf_gdb_index ()
{
return quick_symbol_functions_up (new dwarf2_gdb_index);
}
static quick_symbol_functions_up
make_dwarf_debug_names ()
{
return quick_symbol_functions_up (new dwarf2_debug_names_index);
}
/* Utility hash function for a stmt_list_hash. */
static hashval_t
hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
{
hashval_t v = 0;
if (stmt_list_hash->dwo_unit != NULL)
v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
v += to_underlying (stmt_list_hash->line_sect_off);
return v;
}
/* Utility equality function for a stmt_list_hash. */
static int
eq_stmt_list_entry (const struct stmt_list_hash *lhs,
const struct stmt_list_hash *rhs)
{
if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
return 0;
if (lhs->dwo_unit != NULL
&& lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
return 0;
return lhs->line_sect_off == rhs->line_sect_off;
}
/* Hash function for a quick_file_names. */
static hashval_t
hash_file_name_entry (const void *e)
{
const struct quick_file_names *file_data
= (const struct quick_file_names *) e;
return hash_stmt_list_entry (&file_data->hash);
}
/* Equality function for a quick_file_names. */
static int
eq_file_name_entry (const void *a, const void *b)
{
const struct quick_file_names *ea = (const struct quick_file_names *) a;
const struct quick_file_names *eb = (const struct quick_file_names *) b;
return eq_stmt_list_entry (&ea->hash, &eb->hash);
}
/* Create a quick_file_names hash table. */
static htab_up
create_quick_file_names_table (unsigned int nr_initial_entries)
{
return htab_up (htab_create_alloc (nr_initial_entries,
hash_file_name_entry, eq_file_name_entry,
nullptr, xcalloc, xfree));
}
/* Read in CU (dwarf2_cu object) for PER_CU in the context of PER_OBJFILE. This
function is unrelated to symtabs, symtab would have to be created afterwards.
You should call age_cached_comp_units after processing the CU. */
static dwarf2_cu *
load_cu (dwarf2_per_cu_data *per_cu, dwarf2_per_objfile *per_objfile,
bool skip_partial)
{
if (per_cu->is_debug_types)
load_full_type_unit (per_cu, per_objfile);
else
load_full_comp_unit (per_cu, per_objfile, per_objfile->get_cu (per_cu),
skip_partial, language_minimal);
dwarf2_cu *cu = per_objfile->get_cu (per_cu);
if (cu == nullptr)
return nullptr; /* Dummy CU. */
dwarf2_find_base_address (cu->dies, cu);
return cu;
}
/* Read in the symbols for PER_CU in the context of PER_OBJFILE. */
static void
dw2_do_instantiate_symtab (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile, bool skip_partial)
{
/* Skip type_unit_groups, reading the type units they contain
is handled elsewhere. */
if (per_cu->type_unit_group_p ())
return;
{
/* The destructor of dwarf2_queue_guard frees any entries left on
the queue. After this point we're guaranteed to leave this function
with the dwarf queue empty. */
dwarf2_queue_guard q_guard (per_objfile);
if (!per_objfile->symtab_set_p (per_cu))
{
queue_comp_unit (per_cu, per_objfile, language_minimal);
dwarf2_cu *cu = load_cu (per_cu, per_objfile, skip_partial);
/* If we just loaded a CU from a DWO, and we're working with an index
that may badly handle TUs, load all the TUs in that DWO as well.
http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
if (!per_cu->is_debug_types
&& cu != NULL
&& cu->dwo_unit != NULL
&& per_objfile->per_bfd->index_table != NULL
&& per_objfile->per_bfd->index_table->version <= 7
/* DWP files aren't supported yet. */
&& get_dwp_file (per_objfile) == NULL)
queue_and_load_all_dwo_tus (cu);
}
process_queue (per_objfile);
}
/* Age the cache, releasing compilation units that have not
been used recently. */
per_objfile->age_comp_units ();
}
/* Ensure that the symbols for PER_CU have been read in. DWARF2_PER_OBJFILE is
the per-objfile for which this symtab is instantiated.
Returns the resulting symbol table. */
static struct compunit_symtab *
dw2_instantiate_symtab (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
bool skip_partial)
{
gdb_assert (per_objfile->per_bfd->using_index);
if (!per_objfile->symtab_set_p (per_cu))
{
free_cached_comp_units freer (per_objfile);
scoped_restore decrementer = increment_reading_symtab ();
dw2_do_instantiate_symtab (per_cu, per_objfile, skip_partial);
process_cu_includes (per_objfile);
}
return per_objfile->get_symtab (per_cu);
}
/* See read.h. */
dwarf2_per_cu_data_up
dwarf2_per_bfd::allocate_per_cu ()
{
dwarf2_per_cu_data_up result (new dwarf2_per_cu_data);
result->per_bfd = this;
result->index = all_comp_units.size ();
return result;
}
/* See read.h. */
signatured_type_up
dwarf2_per_bfd::allocate_signatured_type (ULONGEST signature)
{
signatured_type_up result (new signatured_type (signature));
result->per_bfd = this;
result->index = all_comp_units.size ();
result->is_debug_types = true;
tu_stats.nr_tus++;
return result;
}
/* Return a new dwarf2_per_cu_data allocated on the per-bfd
obstack, and constructed with the specified field values. */
static dwarf2_per_cu_data_up
create_cu_from_index_list (dwarf2_per_bfd *per_bfd,
struct dwarf2_section_info *section,
int is_dwz,
sect_offset sect_off, ULONGEST length)
{
dwarf2_per_cu_data_up the_cu = per_bfd->allocate_per_cu ();
the_cu->sect_off = sect_off;
the_cu->length = length;
the_cu->section = section;
the_cu->v.quick = OBSTACK_ZALLOC (&per_bfd->obstack,
struct dwarf2_per_cu_quick_data);
the_cu->is_dwz = is_dwz;
return the_cu;
}
/* A helper for create_cus_from_index that handles a given list of
CUs. */
static void
create_cus_from_index_list (dwarf2_per_bfd *per_bfd,
const gdb_byte *cu_list, offset_type n_elements,
struct dwarf2_section_info *section,
int is_dwz)
{
for (offset_type i = 0; i < n_elements; i += 2)
{
gdb_static_assert (sizeof (ULONGEST) >= 8);
sect_offset sect_off
= (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
cu_list += 2 * 8;
dwarf2_per_cu_data_up per_cu
= create_cu_from_index_list (per_bfd, section, is_dwz, sect_off,
length);
per_bfd->all_comp_units.push_back (std::move (per_cu));
}
}
/* Read the CU list from the mapped index, and use it to create all
the CU objects for PER_BFD. */
static void
create_cus_from_index (dwarf2_per_bfd *per_bfd,
const gdb_byte *cu_list, offset_type cu_list_elements,
const gdb_byte *dwz_list, offset_type dwz_elements)
{
gdb_assert (per_bfd->all_comp_units.empty ());
per_bfd->all_comp_units.reserve ((cu_list_elements + dwz_elements) / 2);
create_cus_from_index_list (per_bfd, cu_list, cu_list_elements,
&per_bfd->info, 0);
if (dwz_elements == 0)
return;
dwz_file *dwz = dwarf2_get_dwz_file (per_bfd);
create_cus_from_index_list (per_bfd, dwz_list, dwz_elements,
&dwz->info, 1);
}
/* Create the signatured type hash table from the index. */
static void
create_signatured_type_table_from_index
(dwarf2_per_bfd *per_bfd, struct dwarf2_section_info *section,
const gdb_byte *bytes, offset_type elements)
{
htab_up sig_types_hash = allocate_signatured_type_table ();
for (offset_type i = 0; i < elements; i += 3)
{
signatured_type_up sig_type;
ULONGEST signature;
void **slot;
cu_offset type_offset_in_tu;
gdb_static_assert (sizeof (ULONGEST) >= 8);
sect_offset sect_off
= (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
type_offset_in_tu
= (cu_offset) extract_unsigned_integer (bytes + 8, 8,
BFD_ENDIAN_LITTLE);
signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
bytes += 3 * 8;
sig_type = per_bfd->allocate_signatured_type (signature);
sig_type->type_offset_in_tu = type_offset_in_tu;
sig_type->section = section;
sig_type->sect_off = sect_off;
sig_type->v.quick
= OBSTACK_ZALLOC (&per_bfd->obstack,
struct dwarf2_per_cu_quick_data);
slot = htab_find_slot (sig_types_hash.get (), sig_type.get (), INSERT);
*slot = sig_type.get ();
per_bfd->all_comp_units.emplace_back (sig_type.release ());
}
per_bfd->signatured_types = std::move (sig_types_hash);
}
/* Create the signatured type hash table from .debug_names. */
static void
create_signatured_type_table_from_debug_names
(dwarf2_per_objfile *per_objfile,
const mapped_debug_names &map,
struct dwarf2_section_info *section,
struct dwarf2_section_info *abbrev_section)
{
struct objfile *objfile = per_objfile->objfile;
section->read (objfile);
abbrev_section->read (objfile);
htab_up sig_types_hash = allocate_signatured_type_table ();
for (uint32_t i = 0; i < map.tu_count; ++i)
{
signatured_type_up sig_type;
void **slot;
sect_offset sect_off
= (sect_offset) (extract_unsigned_integer
(map.tu_table_reordered + i * map.offset_size,
map.offset_size,
map.dwarf5_byte_order));
comp_unit_head cu_header;
read_and_check_comp_unit_head (per_objfile, &cu_header, section,
abbrev_section,
section->buffer + to_underlying (sect_off),
rcuh_kind::TYPE);
sig_type = per_objfile->per_bfd->allocate_signatured_type
(cu_header.signature);
sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
sig_type->section = section;
sig_type->sect_off = sect_off;
sig_type->v.quick
= OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack,
struct dwarf2_per_cu_quick_data);
slot = htab_find_slot (sig_types_hash.get (), sig_type.get (), INSERT);
*slot = sig_type.get ();
per_objfile->per_bfd->all_comp_units.emplace_back (sig_type.release ());
}
per_objfile->per_bfd->signatured_types = std::move (sig_types_hash);
}
/* Read the address map data from the mapped index, and use it to
populate the psymtabs_addrmap. */
static void
create_addrmap_from_index (dwarf2_per_objfile *per_objfile,
struct mapped_index *index)
{
struct objfile *objfile = per_objfile->objfile;
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
struct gdbarch *gdbarch = objfile->arch ();
const gdb_byte *iter, *end;
struct addrmap *mutable_map;
CORE_ADDR baseaddr;
auto_obstack temp_obstack;
mutable_map = addrmap_create_mutable (&temp_obstack);
iter = index->address_table.data ();
end = iter + index->address_table.size ();
baseaddr = objfile->text_section_offset ();
while (iter < end)
{
ULONGEST hi, lo, cu_index;
lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
iter += 8;
hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
iter += 8;
cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
iter += 4;
if (lo > hi)
{
complaint (_(".gdb_index address table has invalid range (%s - %s)"),
hex_string (lo), hex_string (hi));
continue;
}
if (cu_index >= per_bfd->all_comp_units.size ())
{
complaint (_(".gdb_index address table has invalid CU number %u"),
(unsigned) cu_index);
continue;
}
lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr) - baseaddr;
hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr) - baseaddr;
addrmap_set_empty (mutable_map, lo, hi - 1,
per_bfd->get_cu (cu_index));
}
per_bfd->index_addrmap = addrmap_create_fixed (mutable_map,
&per_bfd->obstack);
}
/* Read the address map data from DWARF-5 .debug_aranges, and use it to
populate the psymtabs_addrmap. */
static void
create_addrmap_from_aranges (dwarf2_per_objfile *per_objfile,
struct dwarf2_section_info *section)
{
struct objfile *objfile = per_objfile->objfile;
bfd *abfd = objfile->obfd;
struct gdbarch *gdbarch = objfile->arch ();
const CORE_ADDR baseaddr = objfile->text_section_offset ();
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
auto_obstack temp_obstack;
addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
std::unordered_map<sect_offset,
dwarf2_per_cu_data *,
gdb::hash_enum<sect_offset>>
debug_info_offset_to_per_cu;
for (const auto &per_cu : per_bfd->all_comp_units)
{
/* A TU will not need aranges, and skipping them here is an easy
way of ignoring .debug_types -- and possibly seeing a
duplicate section offset -- entirely. */
if (per_cu->is_debug_types)
continue;
const auto insertpair
= debug_info_offset_to_per_cu.emplace (per_cu->sect_off,
per_cu.get ());
if (!insertpair.second)
{
warning (_("Section .debug_aranges in %s has duplicate "
"debug_info_offset %s, ignoring .debug_aranges."),
objfile_name (objfile), sect_offset_str (per_cu->sect_off));
return;
}
}
section->read (objfile);
const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
const gdb_byte *addr = section->buffer;
while (addr < section->buffer + section->size)
{
const gdb_byte *const entry_addr = addr;
unsigned int bytes_read;
const LONGEST entry_length = read_initial_length (abfd, addr,
&bytes_read);
addr += bytes_read;
const gdb_byte *const entry_end = addr + entry_length;
const bool dwarf5_is_dwarf64 = bytes_read != 4;
const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
if (addr + entry_length > section->buffer + section->size)
{
warning (_("Section .debug_aranges in %s entry at offset %s "
"length %s exceeds section length %s, "
"ignoring .debug_aranges."),
objfile_name (objfile),
plongest (entry_addr - section->buffer),
plongest (bytes_read + entry_length),
pulongest (section->size));
return;
}
/* The version number. */
const uint16_t version = read_2_bytes (abfd, addr);
addr += 2;
if (version != 2)
{
warning (_("Section .debug_aranges in %s entry at offset %s "
"has unsupported version %d, ignoring .debug_aranges."),
objfile_name (objfile),
plongest (entry_addr - section->buffer), version);
return;
}
const uint64_t debug_info_offset
= extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
addr += offset_size;
const auto per_cu_it
= debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
if (per_cu_it == debug_info_offset_to_per_cu.cend ())
{
warning (_("Section .debug_aranges in %s entry at offset %s "
"debug_info_offset %s does not exists, "
"ignoring .debug_aranges."),
objfile_name (objfile),
plongest (entry_addr - section->buffer),
pulongest (debug_info_offset));
return;
}
dwarf2_per_cu_data *const per_cu = per_cu_it->second;
const uint8_t address_size = *addr++;
if (address_size < 1 || address_size > 8)
{
warning (_("Section .debug_aranges in %s entry at offset %s "
"address_size %u is invalid, ignoring .debug_aranges."),
objfile_name (objfile),
plongest (entry_addr - section->buffer), address_size);
return;
}
const uint8_t segment_selector_size = *addr++;
if (segment_selector_size != 0)
{
warning (_("Section .debug_aranges in %s entry at offset %s "
"segment_selector_size %u is not supported, "
"ignoring .debug_aranges."),
objfile_name (objfile),
plongest (entry_addr - section->buffer),
segment_selector_size);
return;
}
/* Must pad to an alignment boundary that is twice the address
size. It is undocumented by the DWARF standard but GCC does
use it. However, not every compiler does this. We can see
whether it has happened by looking at the total length of the
contents of the aranges for this CU -- it if isn't a multiple
of twice the address size, then we skip any leftover
bytes. */
addr += (entry_end - addr) % (2 * address_size);
for (;;)
{
if (addr + 2 * address_size > entry_end)
{
warning (_("Section .debug_aranges in %s entry at offset %s "
"address list is not properly terminated, "
"ignoring .debug_aranges."),
objfile_name (objfile),
plongest (entry_addr - section->buffer));
return;
}
ULONGEST start = extract_unsigned_integer (addr, address_size,
dwarf5_byte_order);
addr += address_size;
ULONGEST length = extract_unsigned_integer (addr, address_size,
dwarf5_byte_order);
addr += address_size;
if (start == 0 && length == 0)
break;
if (start == 0 && !per_bfd->has_section_at_zero)
{
/* Symbol was eliminated due to a COMDAT group. */
continue;
}
ULONGEST end = start + length;
start = (gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr)
- baseaddr);
end = (gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr)
- baseaddr);
addrmap_set_empty (mutable_map, start, end - 1, per_cu);
}
}
per_bfd->index_addrmap = addrmap_create_fixed (mutable_map,
&per_bfd->obstack);
}
/* A helper function that reads the .gdb_index from BUFFER and fills
in MAP. FILENAME is the name of the file containing the data;
it is used for error reporting. DEPRECATED_OK is true if it is
ok to use deprecated sections.
CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
out parameters that are filled in with information about the CU and
TU lists in the section.
Returns true if all went well, false otherwise. */
static bool
read_gdb_index_from_buffer (const char *filename,
bool deprecated_ok,
gdb::array_view<const gdb_byte> buffer,
struct mapped_index *map,
const gdb_byte **cu_list,
offset_type *cu_list_elements,
const gdb_byte **types_list,
offset_type *types_list_elements)
{
const gdb_byte *addr = &buffer[0];
offset_view metadata (buffer);
/* Version check. */
offset_type version = metadata[0];
/* Versions earlier than 3 emitted every copy of a psymbol. This
causes the index to behave very poorly for certain requests. Version 3
contained incomplete addrmap. So, it seems better to just ignore such
indices. */
if (version < 4)
{
static int warning_printed = 0;
if (!warning_printed)
{
warning (_("Skipping obsolete .gdb_index section in %s."),
filename);
warning_printed = 1;
}
return 0;
}
/* Index version 4 uses a different hash function than index version
5 and later.
Versions earlier than 6 did not emit psymbols for inlined
functions. Using these files will cause GDB not to be able to
set breakpoints on inlined functions by name, so we ignore these
indices unless the user has done
"set use-deprecated-index-sections on". */
if (version < 6 && !deprecated_ok)
{
static int warning_printed = 0;
if (!warning_printed)
{
warning (_("\
Skipping deprecated .gdb_index section in %s.\n\
Do \"set use-deprecated-index-sections on\" before the file is read\n\
to use the section anyway."),
filename);
warning_printed = 1;
}
return 0;
}
/* Version 7 indices generated by gold refer to the CU for a symbol instead
of the TU (for symbols coming from TUs),
http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
Plus gold-generated indices can have duplicate entries for global symbols,
http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
These are just performance bugs, and we can't distinguish gdb-generated
indices from gold-generated ones, so issue no warning here. */
/* Indexes with higher version than the one supported by GDB may be no
longer backward compatible. */
if (version > 8)
return 0;
map->version = version;
int i = 1;
*cu_list = addr + metadata[i];
*cu_list_elements = (metadata[i + 1] - metadata[i]) / 8;
++i;
*types_list = addr + metadata[i];
*types_list_elements = (metadata[i + 1] - metadata[i]) / 8;
++i;
const gdb_byte *address_table = addr + metadata[i];
const gdb_byte *address_table_end = addr + metadata[i + 1];
map->address_table
= gdb::array_view<const gdb_byte> (address_table, address_table_end);
++i;
const gdb_byte *symbol_table = addr + metadata[i];
const gdb_byte *symbol_table_end = addr + metadata[i + 1];
map->symbol_table
= offset_view (gdb::array_view<const gdb_byte> (symbol_table,
symbol_table_end));
++i;
map->constant_pool = buffer.slice (metadata[i]);
if (map->constant_pool.empty () && !map->symbol_table.empty ())
{
/* An empty constant pool implies that all symbol table entries are
empty. Make map->symbol_table.empty () == true. */
map->symbol_table
= offset_view (gdb::array_view<const gdb_byte> (symbol_table,
symbol_table));
}
return 1;
}
/* Callback types for dwarf2_read_gdb_index. */
typedef gdb::function_view
<gdb::array_view<const gdb_byte>(objfile *, dwarf2_per_bfd *)>
get_gdb_index_contents_ftype;
typedef gdb::function_view
<gdb::array_view<const gdb_byte>(objfile *, dwz_file *)>
get_gdb_index_contents_dwz_ftype;
/* Read .gdb_index. If everything went ok, initialize the "quick"
elements of all the CUs and return 1. Otherwise, return 0. */
static int
dwarf2_read_gdb_index
(dwarf2_per_objfile *per_objfile,
get_gdb_index_contents_ftype get_gdb_index_contents,
get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz)
{
const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
struct dwz_file *dwz;
struct objfile *objfile = per_objfile->objfile;
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
gdb::array_view<const gdb_byte> main_index_contents
= get_gdb_index_contents (objfile, per_bfd);
if (main_index_contents.empty ())
return 0;
std::unique_ptr<struct mapped_index> map (new struct mapped_index);
if (!read_gdb_index_from_buffer (objfile_name (objfile),
use_deprecated_index_sections,
main_index_contents, map.get (), &cu_list,
&cu_list_elements, &types_list,
&types_list_elements))
return 0;
/* Don't use the index if it's empty. */
if (map->symbol_table.empty ())
return 0;
/* If there is a .dwz file, read it so we can get its CU list as
well. */
dwz = dwarf2_get_dwz_file (per_bfd);
if (dwz != NULL)
{
struct mapped_index dwz_map;
const gdb_byte *dwz_types_ignore;
offset_type dwz_types_elements_ignore;
gdb::array_view<const gdb_byte> dwz_index_content
= get_gdb_index_contents_dwz (objfile, dwz);
if (dwz_index_content.empty ())
return 0;
if (!read_gdb_index_from_buffer (bfd_get_filename (dwz->dwz_bfd.get ()),
1, dwz_index_content, &dwz_map,
&dwz_list, &dwz_list_elements,
&dwz_types_ignore,
&dwz_types_elements_ignore))
{
warning (_("could not read '.gdb_index' section from %s; skipping"),
bfd_get_filename (dwz->dwz_bfd.get ()));
return 0;
}
}
create_cus_from_index (per_bfd, cu_list, cu_list_elements, dwz_list,
dwz_list_elements);
if (types_list_elements)
{
/* We can only handle a single .debug_types when we have an
index. */
if (per_bfd->types.size () != 1)
return 0;
dwarf2_section_info *section = &per_bfd->types[0];
create_signatured_type_table_from_index (per_bfd, section, types_list,
types_list_elements);
}
create_addrmap_from_index (per_objfile, map.get ());
per_bfd->index_table = std::move (map);
per_bfd->using_index = 1;
per_bfd->quick_file_names_table =
create_quick_file_names_table (per_bfd->all_comp_units.size ());
return 1;
}
/* die_reader_func for dw2_get_file_names. */
static void
dw2_get_file_names_reader (const struct die_reader_specs *reader,
struct die_info *comp_unit_die)
{
struct dwarf2_cu *cu = reader->cu;
struct dwarf2_per_cu_data *this_cu = cu->per_cu;
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct dwarf2_per_cu_data *lh_cu;
struct attribute *attr;
void **slot;
struct quick_file_names *qfn;
gdb_assert (! this_cu->is_debug_types);
this_cu->v.quick->files_read = true;
/* Our callers never want to match partial units -- instead they
will match the enclosing full CU. */
if (comp_unit_die->tag == DW_TAG_partial_unit)
return;
lh_cu = this_cu;
slot = NULL;
line_header_up lh;
sect_offset line_offset {};
attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
if (attr != nullptr && attr->form_is_unsigned ())
{
struct quick_file_names find_entry;
line_offset = (sect_offset) attr->as_unsigned ();
/* We may have already read in this line header (TU line header sharing).
If we have we're done. */
find_entry.hash.dwo_unit = cu->dwo_unit;
find_entry.hash.line_sect_off = line_offset;
slot = htab_find_slot (per_objfile->per_bfd->quick_file_names_table.get (),
&find_entry, INSERT);
if (*slot != NULL)
{
lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
return;
}
lh = dwarf_decode_line_header (line_offset, cu);
}
file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
int offset = 0;
if (strcmp (fnd.name, "<unknown>") != 0)
++offset;
else if (lh == nullptr)
return;
qfn = XOBNEW (&per_objfile->per_bfd->obstack, struct quick_file_names);
qfn->hash.dwo_unit = cu->dwo_unit;
qfn->hash.line_sect_off = line_offset;
/* There may not be a DW_AT_stmt_list. */
if (slot != nullptr)
*slot = qfn;
std::vector<const char *> include_names;
if (lh != nullptr)
{
for (const auto &entry : lh->file_names ())
{
gdb::unique_xmalloc_ptr<char> name_holder;
const char *include_name =
compute_include_file_name (lh.get (), entry, fnd, &name_holder);
if (include_name != nullptr)
{
include_name = per_objfile->objfile->intern (include_name);
include_names.push_back (include_name);
}
}
}
qfn->num_file_names = offset + include_names.size ();
qfn->comp_dir = fnd.comp_dir;
qfn->file_names =
XOBNEWVEC (&per_objfile->per_bfd->obstack, const char *,
qfn->num_file_names);
if (offset != 0)
qfn->file_names[0] = xstrdup (fnd.name);
if (!include_names.empty ())
memcpy (&qfn->file_names[offset], include_names.data (),
include_names.size () * sizeof (const char *));
qfn->real_names = NULL;
lh_cu->v.quick->file_names = qfn;
}
/* A helper for the "quick" functions which attempts to read the line
table for THIS_CU. */
static struct quick_file_names *
dw2_get_file_names (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile)
{
/* This should never be called for TUs. */
gdb_assert (! this_cu->is_debug_types);
/* Nor type unit groups. */
gdb_assert (! this_cu->type_unit_group_p ());
if (this_cu->v.quick->files_read)
return this_cu->v.quick->file_names;
cutu_reader reader (this_cu, per_objfile);
if (!reader.dummy_p)
dw2_get_file_names_reader (&reader, reader.comp_unit_die);
return this_cu->v.quick->file_names;
}
/* A helper for the "quick" functions which computes and caches the
real path for a given file name from the line table. */
static const char *
dw2_get_real_path (dwarf2_per_objfile *per_objfile,
struct quick_file_names *qfn, int index)
{
if (qfn->real_names == NULL)
qfn->real_names = OBSTACK_CALLOC (&per_objfile->per_bfd->obstack,
qfn->num_file_names, const char *);
if (qfn->real_names[index] == NULL)
{
const char *dirname = nullptr;
if (!IS_ABSOLUTE_PATH (qfn->file_names[index]))
dirname = qfn->comp_dir;
gdb::unique_xmalloc_ptr<char> fullname;
fullname = find_source_or_rewrite (qfn->file_names[index], dirname);
qfn->real_names[index] = fullname.release ();
}
return qfn->real_names[index];
}
struct symtab *
dwarf2_base_index_functions::find_last_source_symtab (struct objfile *objfile)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
dwarf2_per_cu_data *dwarf_cu
= per_objfile->per_bfd->all_comp_units.back ().get ();
compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu, per_objfile, false);
if (cust == NULL)
return NULL;
return compunit_primary_filetab (cust);
}
/* See read.h. */
void
dwarf2_per_cu_data::free_cached_file_names ()
{
if (per_bfd == nullptr || !per_bfd->using_index || v.quick == nullptr)
return;
struct quick_file_names *file_data = v.quick->file_names;
if (file_data != nullptr && file_data->real_names != nullptr)
{
for (int i = 0; i < file_data->num_file_names; ++i)
{
xfree ((void *) file_data->real_names[i]);
file_data->real_names[i] = nullptr;
}
}
}
void
dwarf2_base_index_functions::forget_cached_source_info
(struct objfile *objfile)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
for (auto &per_cu : per_objfile->per_bfd->all_comp_units)
per_cu->free_cached_file_names ();
}
/* Struct used to manage iterating over all CUs looking for a symbol. */
struct dw2_symtab_iterator
{
/* The dwarf2_per_objfile owning the CUs we are iterating on. */
dwarf2_per_objfile *per_objfile;
/* If set, only look for symbols that match that block. Valid values are
GLOBAL_BLOCK and STATIC_BLOCK. */
gdb::optional<block_enum> block_index;
/* The kind of symbol we're looking for. */
domain_enum domain;
/* The list of CUs from the index entry of the symbol,
or NULL if not found. */
offset_view vec;
/* The next element in VEC to look at. */
int next;
/* The number of elements in VEC, or zero if there is no match. */
int length;
/* Have we seen a global version of the symbol?
If so we can ignore all further global instances.
This is to work around gold/15646, inefficient gold-generated
indices. */
int global_seen;
};
/* Initialize the index symtab iterator ITER, offset_type NAMEI variant. */
static void
dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
dwarf2_per_objfile *per_objfile,
gdb::optional<block_enum> block_index,
domain_enum domain, offset_type namei)
{
iter->per_objfile = per_objfile;
iter->block_index = block_index;
iter->domain = domain;
iter->next = 0;
iter->global_seen = 0;
iter->vec = {};
iter->length = 0;
mapped_index *index = per_objfile->per_bfd->index_table.get ();
/* index is NULL if OBJF_READNOW. */
if (index == NULL)
return;
gdb_assert (!index->symbol_name_slot_invalid (namei));
offset_type vec_idx = index->symbol_vec_index (namei);
iter->vec = offset_view (index->constant_pool.slice (vec_idx));
iter->length = iter->vec[0];
}
/* Return the next matching CU or NULL if there are no more. */
static struct dwarf2_per_cu_data *
dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
{
dwarf2_per_objfile *per_objfile = iter->per_objfile;
for ( ; iter->next < iter->length; ++iter->next)
{
offset_type cu_index_and_attrs = iter->vec[iter->next + 1];
offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
gdb_index_symbol_kind symbol_kind =
GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
/* Only check the symbol attributes if they're present.
Indices prior to version 7 don't record them,
and indices >= 7 may elide them for certain symbols
(gold does this). */
int attrs_valid =
(per_objfile->per_bfd->index_table->version >= 7
&& symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
/* Don't crash on bad data. */
if (cu_index >= per_objfile->per_bfd->all_comp_units.size ())
{
complaint (_(".gdb_index entry has bad CU index"
" [in module %s]"), objfile_name (per_objfile->objfile));
continue;
}
dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cu (cu_index);
/* Skip if already read in. */
if (per_objfile->symtab_set_p (per_cu))
continue;
/* Check static vs global. */
if (attrs_valid)
{
bool is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
if (iter->block_index.has_value ())
{
bool want_static = *iter->block_index == STATIC_BLOCK;
if (is_static != want_static)
continue;
}
/* Work around gold/15646. */
if (!is_static
&& symbol_kind == GDB_INDEX_SYMBOL_KIND_TYPE)
{
if (iter->global_seen)
continue;
iter->global_seen = 1;
}
}
/* Only check the symbol's kind if it has one. */
if (attrs_valid)
{
switch (iter->domain)
{
case VAR_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
&& symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
/* Some types are also in VAR_DOMAIN. */
&& symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
continue;
break;
case STRUCT_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
continue;
break;
case LABEL_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
continue;
break;
case MODULE_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
continue;
break;
default:
break;
}
}
++iter->next;
return per_cu;
}
return NULL;
}
void
dwarf2_base_index_functions::print_stats (struct objfile *objfile,
bool print_bcache)
{
if (print_bcache)
return;
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
int total = per_objfile->per_bfd->all_comp_units.size ();
int count = 0;
for (int i = 0; i < total; ++i)
{
dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cu (i);
if (!per_objfile->symtab_set_p (per_cu))
++count;
}
printf_filtered (_(" Number of read CUs: %d\n"), total - count);
printf_filtered (_(" Number of unread CUs: %d\n"), count);
}
/* This dumps minimal information about the index.
It is called via "mt print objfiles".
One use is to verify .gdb_index has been loaded by the
gdb.dwarf2/gdb-index.exp testcase. */
void
dwarf2_gdb_index::dump (struct objfile *objfile)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
gdb_assert (per_objfile->per_bfd->using_index);
printf_filtered (".gdb_index:");
if (per_objfile->per_bfd->index_table != NULL)
{
printf_filtered (" version %d\n",
per_objfile->per_bfd->index_table->version);
}
else
printf_filtered (" faked for \"readnow\"\n");
printf_filtered ("\n");
}
void
dwarf2_base_index_functions::expand_all_symtabs (struct objfile *objfile)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
int total_units = per_objfile->per_bfd->all_comp_units.size ();
for (int i = 0; i < total_units; ++i)
{
dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cu (i);
/* We don't want to directly expand a partial CU, because if we
read it with the wrong language, then assertion failures can
be triggered later on. See PR symtab/23010. So, tell
dw2_instantiate_symtab to skip partial CUs -- any important
partial CU will be read via DW_TAG_imported_unit anyway. */
dw2_instantiate_symtab (per_cu, per_objfile, true);
}
}
static bool
dw2_expand_symtabs_matching_symbol
(mapped_index_base &index,
const lookup_name_info &lookup_name_in,
gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
gdb::function_view<bool (offset_type)> match_callback,
dwarf2_per_objfile *per_objfile);
static bool
dw2_expand_symtabs_matching_one
(dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify);
void
dwarf2_gdb_index::expand_matching_symbols
(struct objfile *objfile,
const lookup_name_info &name, domain_enum domain,
int global,
symbol_compare_ftype *ordered_compare)
{
/* Used for Ada. */
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
const block_enum block_kind = global ? GLOBAL_BLOCK : STATIC_BLOCK;
if (per_objfile->per_bfd->index_table != nullptr)
{
mapped_index &index = *per_objfile->per_bfd->index_table;
const char *match_name = name.ada ().lookup_name ().c_str ();
auto matcher = [&] (const char *symname)
{
if (ordered_compare == nullptr)
return true;
return ordered_compare (symname, match_name) == 0;
};
dw2_expand_symtabs_matching_symbol (index, name, matcher,
[&] (offset_type namei)
{
struct dw2_symtab_iterator iter;
struct dwarf2_per_cu_data *per_cu;
dw2_symtab_iter_init (&iter, per_objfile, block_kind, domain,
namei);
while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
dw2_expand_symtabs_matching_one (per_cu, per_objfile, nullptr,
nullptr);
return true;
}, per_objfile);
}
else
{
/* We have -readnow: no .gdb_index, but no partial symtabs either. So,
proceed assuming all symtabs have been read in. */
}
}
/* Starting from a search name, return the string that finds the upper
bound of all strings that start with SEARCH_NAME in a sorted name
list. Returns the empty string to indicate that the upper bound is
the end of the list. */
static std::string
make_sort_after_prefix_name (const char *search_name)
{
/* When looking to complete "func", we find the upper bound of all
symbols that start with "func" by looking for where we'd insert
the closest string that would follow "func" in lexicographical
order. Usually, that's "func"-with-last-character-incremented,
i.e. "fund". Mind non-ASCII characters, though. Usually those
will be UTF-8 multi-byte sequences, but we can't be certain.
Especially mind the 0xff character, which is a valid character in
non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
rule out compilers allowing it in identifiers. Note that
conveniently, strcmp/strcasecmp are specified to compare
characters interpreted as unsigned char. So what we do is treat
the whole string as a base 256 number composed of a sequence of
base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
to 0, and carries 1 to the following more-significant position.
If the very first character in SEARCH_NAME ends up incremented
and carries/overflows, then the upper bound is the end of the
list. The string after the empty string is also the empty
string.
Some examples of this operation:
SEARCH_NAME => "+1" RESULT
"abc" => "abd"
"ab\xff" => "ac"
"\xff" "a" "\xff" => "\xff" "b"
"\xff" => ""
"\xff\xff" => ""
"" => ""
Then, with these symbols for example:
func
func1
fund
completing "func" looks for symbols between "func" and
"func"-with-last-character-incremented, i.e. "fund" (exclusive),
which finds "func" and "func1", but not "fund".
And with:
funcÿ (Latin1 'ÿ' [0xff])
funcÿ1
fund
completing "funcÿ" looks for symbols between "funcÿ" and "fund"
(exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
And with:
ÿÿ (Latin1 'ÿ' [0xff])
ÿÿ1
completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
the end of the list.
*/
std::string after = search_name;
while (!after.empty () && (unsigned char) after.back () == 0xff)
after.pop_back ();
if (!after.empty ())
after.back () = (unsigned char) after.back () + 1;
return after;
}
/* See declaration. */
std::pair<std::vector<name_component>::const_iterator,
std::vector<name_component>::const_iterator>
mapped_index_base::find_name_components_bounds
(const lookup_name_info &lookup_name_without_params, language lang,
dwarf2_per_objfile *per_objfile) const
{
auto *name_cmp
= this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
const char *lang_name
= lookup_name_without_params.language_lookup_name (lang);
/* Comparison function object for lower_bound that matches against a
given symbol name. */
auto lookup_compare_lower = [&] (const name_component &elem,
const char *name)
{
const char *elem_qualified = this->symbol_name_at (elem.idx, per_objfile);
const char *elem_name = elem_qualified + elem.name_offset;
return name_cmp (elem_name, name) < 0;
};
/* Comparison function object for upper_bound that matches against a
given symbol name. */
auto lookup_compare_upper = [&] (const char *name,
const name_component &elem)
{
const char *elem_qualified = this->symbol_name_at (elem.idx, per_objfile);
const char *elem_name = elem_qualified + elem.name_offset;
return name_cmp (name, elem_name) < 0;
};
auto begin = this->name_components.begin ();
auto end = this->name_components.end ();
/* Find the lower bound. */
auto lower = [&] ()
{
if (lookup_name_without_params.completion_mode () && lang_name[0] == '\0')
return begin;
else
return std::lower_bound (begin, end, lang_name, lookup_compare_lower);
} ();
/* Find the upper bound. */
auto upper = [&] ()
{
if (lookup_name_without_params.completion_mode ())
{
/* In completion mode, we want UPPER to point past all
symbols names that have the same prefix. I.e., with
these symbols, and completing "func":
function << lower bound
function1
other_function << upper bound
We find the upper bound by looking for the insertion
point of "func"-with-last-character-incremented,
i.e. "fund". */
std::string after = make_sort_after_prefix_name (lang_name);
if (after.empty ())
return end;
return std::lower_bound (lower, end, after.c_str (),
lookup_compare_lower);
}
else
return std::upper_bound (lower, end, lang_name, lookup_compare_upper);
} ();
return {lower, upper};
}
/* See declaration. */
void
mapped_index_base::build_name_components (dwarf2_per_objfile *per_objfile)
{
if (!this->name_components.empty ())
return;
this->name_components_casing = case_sensitivity;
auto *name_cmp
= this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
/* The code below only knows how to break apart components of C++
symbol names (and other languages that use '::' as
namespace/module separator) and Ada symbol names. */
auto count = this->symbol_name_count ();
for (offset_type idx = 0; idx < count; idx++)
{
if (this->symbol_name_slot_invalid (idx))
continue;
const char *name = this->symbol_name_at (idx, per_objfile);
/* Add each name component to the name component table. */
unsigned int previous_len = 0;
if (strstr (name, "::") != nullptr)
{
for (unsigned int current_len = cp_find_first_component (name);
name[current_len] != '\0';
current_len += cp_find_first_component (name + current_len))
{
gdb_assert (name[current_len] == ':');
this->name_components.push_back ({previous_len, idx});
/* Skip the '::'. */
current_len += 2;
previous_len = current_len;
}
}
else
{
/* Handle the Ada encoded (aka mangled) form here. */
for (const char *iter = strstr (name, "__");
iter != nullptr;
iter = strstr (iter, "__"))
{
this->name_components.push_back ({previous_len, idx});
iter += 2;
previous_len = iter - name;
}
}
this->name_components.push_back ({previous_len, idx});
}
/* Sort name_components elements by name. */
auto name_comp_compare = [&] (const name_component &left,
const name_component &right)
{
const char *left_qualified
= this->symbol_name_at (left.idx, per_objfile);
const char *right_qualified
= this->symbol_name_at (right.idx, per_objfile);
const char *left_name = left_qualified + left.name_offset;
const char *right_name = right_qualified + right.name_offset;
return name_cmp (left_name, right_name) < 0;
};
std::sort (this->name_components.begin (),
this->name_components.end (),
name_comp_compare);
}
/* Helper for dw2_expand_symtabs_matching that works with a
mapped_index_base instead of the containing objfile. This is split
to a separate function in order to be able to unit test the
name_components matching using a mock mapped_index_base. For each
symbol name that matches, calls MATCH_CALLBACK, passing it the
symbol's index in the mapped_index_base symbol table. */
static bool
dw2_expand_symtabs_matching_symbol
(mapped_index_base &index,
const lookup_name_info &lookup_name_in,
gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
gdb::function_view<bool (offset_type)> match_callback,
dwarf2_per_objfile *per_objfile)
{
lookup_name_info lookup_name_without_params
= lookup_name_in.make_ignore_params ();
/* Build the symbol name component sorted vector, if we haven't
yet. */
index.build_name_components (per_objfile);
/* The same symbol may appear more than once in the range though.
E.g., if we're looking for symbols that complete "w", and we have
a symbol named "w1::w2", we'll find the two name components for
that same symbol in the range. To be sure we only call the
callback once per symbol, we first collect the symbol name
indexes that matched in a temporary vector and ignore
duplicates. */
std::vector<offset_type> matches;
struct name_and_matcher
{
symbol_name_matcher_ftype *matcher;
const char *name;
bool operator== (const name_and_matcher &other) const
{
return matcher == other.matcher && strcmp (name, other.name) == 0;
}
};
/* A vector holding all the different symbol name matchers, for all
languages. */
std::vector<name_and_matcher> matchers;
for (int i = 0; i < nr_languages; i++)
{
enum language lang_e = (enum language) i;
const language_defn *lang = language_def (lang_e);
symbol_name_matcher_ftype *name_matcher
= lang->get_symbol_name_matcher (lookup_name_without_params);
name_and_matcher key {
name_matcher,
lookup_name_without_params.language_lookup_name (lang_e)
};
/* Don't insert the same comparison routine more than once.
Note that we do this linear walk. This is not a problem in
practice because the number of supported languages is
low. */
if (std::find (matchers.begin (), matchers.end (), key)
!= matchers.end ())
continue;
matchers.push_back (std::move (key));
auto bounds
= index.find_name_components_bounds (lookup_name_without_params,
lang_e, per_objfile);
/* Now for each symbol name in range, check to see if we have a name
match, and if so, call the MATCH_CALLBACK callback. */
for (; bounds.first != bounds.second; ++bounds.first)
{
const char *qualified
= index.symbol_name_at (bounds.first->idx, per_objfile);
if (!name_matcher (qualified, lookup_name_without_params, NULL)
|| (symbol_matcher != NULL && !symbol_matcher (qualified)))
continue;
matches.push_back (bounds.first->idx);
}
}
std::sort (matches.begin (), matches.end ());
/* Finally call the callback, once per match. */
ULONGEST prev = -1;
bool result = true;
for (offset_type idx : matches)
{
if (prev != idx)
{
if (!match_callback (idx))
{
result = false;
break;
}
prev = idx;
}
}
/* Above we use a type wider than idx's for 'prev', since 0 and
(offset_type)-1 are both possible values. */
static_assert (sizeof (prev) > sizeof (offset_type), "");
return result;
}
#if GDB_SELF_TEST
namespace selftests { namespace dw2_expand_symtabs_matching {
/* A mock .gdb_index/.debug_names-like name index table, enough to
exercise dw2_expand_symtabs_matching_symbol, which works with the
mapped_index_base interface. Builds an index from the symbol list
passed as parameter to the constructor. */
class mock_mapped_index : public mapped_index_base
{
public:
mock_mapped_index (gdb::array_view<const char *> symbols)
: m_symbol_table (symbols)
{}
DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
/* Return the number of names in the symbol table. */
size_t symbol_name_count () const override
{
return m_symbol_table.size ();
}
/* Get the name of the symbol at IDX in the symbol table. */
const char *symbol_name_at
(offset_type idx, dwarf2_per_objfile *per_objfile) const override
{
return m_symbol_table[idx];
}
private:
gdb::array_view<const char *> m_symbol_table;
};
/* Convenience function that converts a NULL pointer to a "<null>"
string, to pass to print routines. */
static const char *
string_or_null (const char *str)
{
return str != NULL ? str : "<null>";
}
/* Check if a lookup_name_info built from
NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
index. EXPECTED_LIST is the list of expected matches, in expected
matching order. If no match expected, then an empty list is
specified. Returns true on success. On failure prints a warning
indicating the file:line that failed, and returns false. */
static bool
check_match (const char *file, int line,
mock_mapped_index &mock_index,
const char *name, symbol_name_match_type match_type,
bool completion_mode,
std::initializer_list<const char *> expected_list,
dwarf2_per_objfile *per_objfile)
{
lookup_name_info lookup_name (name, match_type, completion_mode);
bool matched = true;
auto mismatch = [&] (const char *expected_str,
const char *got)
{
warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
"expected=\"%s\", got=\"%s\"\n"),
file, line,
(match_type == symbol_name_match_type::FULL
? "FULL" : "WILD"),
name, string_or_null (expected_str), string_or_null (got));
matched = false;
};
auto expected_it = expected_list.begin ();
auto expected_end = expected_list.end ();
dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
nullptr,
[&] (offset_type idx)
{
const char *matched_name = mock_index.symbol_name_at (idx, per_objfile);
const char *expected_str
= expected_it == expected_end ? NULL : *expected_it++;
if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
mismatch (expected_str, matched_name);
return true;
}, per_objfile);
const char *expected_str
= expected_it == expected_end ? NULL : *expected_it++;
if (expected_str != NULL)
mismatch (expected_str, NULL);
return matched;
}
/* The symbols added to the mock mapped_index for testing (in
canonical form). */
static const char *test_symbols[] = {
"function",
"std::bar",
"std::zfunction",
"std::zfunction2",
"w1::w2",
"ns::foo<char*>",
"ns::foo<int>",
"ns::foo<long>",
"ns2::tmpl<int>::foo2",
"(anonymous namespace)::A::B::C",
/* These are used to check that the increment-last-char in the
matching algorithm for completion doesn't match "t1_fund" when
completing "t1_func". */
"t1_func",
"t1_func1",
"t1_fund",
"t1_fund1",
/* A UTF-8 name with multi-byte sequences to make sure that
cp-name-parser understands this as a single identifier ("função"
is "function" in PT). */
u8"u8função",
/* \377 (0xff) is Latin1 'ÿ'. */
"yfunc\377",
/* \377 (0xff) is Latin1 'ÿ'. */
"\377",
"\377\377123",
/* A name with all sorts of complications. Starts with "z" to make
it easier for the completion tests below. */
#define Z_SYM_NAME \
"z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
"::tuple<(anonymous namespace)::ui*, " \
"std::default_delete<(anonymous namespace)::ui>, void>"
Z_SYM_NAME
};
/* Returns true if the mapped_index_base::find_name_component_bounds
method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
in completion mode. */
static bool
check_find_bounds_finds (mapped_index_base &index,
const char *search_name,
gdb::array_view<const char *> expected_syms,
dwarf2_per_objfile *per_objfile)
{
lookup_name_info lookup_name (search_name,
symbol_name_match_type::FULL, true);
auto bounds = index.find_name_components_bounds (lookup_name,
language_cplus,
per_objfile);
size_t distance = std::distance (bounds.first, bounds.second);
if (distance != expected_syms.size ())
return false;
for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
{
auto nc_elem = bounds.first + exp_elem;
const char *qualified = index.symbol_name_at (nc_elem->idx, per_objfile);
if (strcmp (qualified, expected_syms[exp_elem]) != 0)
return false;
}
return true;
}
/* Test the lower-level mapped_index::find_name_component_bounds
method. */
static void
test_mapped_index_find_name_component_bounds ()
{
mock_mapped_index mock_index (test_symbols);
mock_index.build_name_components (NULL /* per_objfile */);
/* Test the lower-level mapped_index::find_name_component_bounds
method in completion mode. */
{
static const char *expected_syms[] = {
"t1_func",
"t1_func1",
};
SELF_CHECK (check_find_bounds_finds
(mock_index, "t1_func", expected_syms,
NULL /* per_objfile */));
}
/* Check that the increment-last-char in the name matching algorithm
for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
{
static const char *expected_syms1[] = {
"\377",
"\377\377123",
};
SELF_CHECK (check_find_bounds_finds
(mock_index, "\377", expected_syms1, NULL /* per_objfile */));
static const char *expected_syms2[] = {
"\377\377123",
};
SELF_CHECK (check_find_bounds_finds
(mock_index, "\377\377", expected_syms2,
NULL /* per_objfile */));
}
}
/* Test dw2_expand_symtabs_matching_symbol. */
static void
test_dw2_expand_symtabs_matching_symbol ()
{
mock_mapped_index mock_index (test_symbols);
/* We let all tests run until the end even if some fails, for debug
convenience. */
bool any_mismatch = false;
/* Create the expected symbols list (an initializer_list). Needed
because lists have commas, and we need to pass them to CHECK,
which is a macro. */
#define EXPECT(...) { __VA_ARGS__ }
/* Wrapper for check_match that passes down the current
__FILE__/__LINE__. */
#define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
any_mismatch |= !check_match (__FILE__, __LINE__, \
mock_index, \
NAME, MATCH_TYPE, COMPLETION_MODE, \
EXPECTED_LIST, NULL)
/* Identity checks. */
for (const char *sym : test_symbols)
{
/* Should be able to match all existing symbols. */
CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
EXPECT (sym));
/* Should be able to match all existing symbols with
parameters. */
std::string with_params = std::string (sym) + "(int)";
CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
EXPECT (sym));
/* Should be able to match all existing symbols with
parameters and qualifiers. */
with_params = std::string (sym) + " ( int ) const";
CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
EXPECT (sym));
/* This should really find sym, but cp-name-parser.y doesn't
know about lvalue/rvalue qualifiers yet. */
with_params = std::string (sym) + " ( int ) &&";
CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
{});
}
/* Check that the name matching algorithm for completion doesn't get
confused with Latin1 'ÿ' / 0xff. */
{
static const char str[] = "\377";
CHECK_MATCH (str, symbol_name_match_type::FULL, true,
EXPECT ("\377", "\377\377123"));
}
/* Check that the increment-last-char in the matching algorithm for
completion doesn't match "t1_fund" when completing "t1_func". */
{
static const char str[] = "t1_func";
CHECK_MATCH (str, symbol_name_match_type::FULL, true,
EXPECT ("t1_func", "t1_func1"));
}
/* Check that completion mode works at each prefix of the expected
symbol name. */
{
static const char str[] = "function(int)";
size_t len = strlen (str);
std::string lookup;
for (size_t i = 1; i < len; i++)
{
lookup.assign (str, i);
CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
EXPECT ("function"));
}
}
/* While "w" is a prefix of both components, the match function
should still only be called once. */
{
CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
EXPECT ("w1::w2"));
CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
EXPECT ("w1::w2"));
}
/* Same, with a "complicated" symbol. */
{
static const char str[] = Z_SYM_NAME;
size_t len = strlen (str);
std::string lookup;
for (size_t i = 1; i < len; i++)
{
lookup.assign (str, i);
CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
EXPECT (Z_SYM_NAME));
}
}
/* In FULL mode, an incomplete symbol doesn't match. */
{
CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
{});
}
/* A complete symbol with parameters matches any overload, since the
index has no overload info. */
{
CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
EXPECT ("std::zfunction", "std::zfunction2"));
CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
EXPECT ("std::zfunction", "std::zfunction2"));
CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
EXPECT ("std::zfunction", "std::zfunction2"));
}
/* Check that whitespace is ignored appropriately. A symbol with a
template argument list. */
{
static const char expected[] = "ns::foo<int>";
CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
EXPECT (expected));
CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
EXPECT (expected));
}
/* Check that whitespace is ignored appropriately. A symbol with a
template argument list that includes a pointer. */
{
static const char expected[] = "ns::foo<char*>";
/* Try both completion and non-completion modes. */
static const bool completion_mode[2] = {false, true};
for (size_t i = 0; i < 2; i++)
{
CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
completion_mode[i], EXPECT (expected));
CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
completion_mode[i], EXPECT (expected));
CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
completion_mode[i], EXPECT (expected));
CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
completion_mode[i], EXPECT (expected));
}
}
{
/* Check method qualifiers are ignored. */
static const char expected[] = "ns::foo<char*>";
CHECK_MATCH ("ns :: foo < char * > ( int ) const",
symbol_name_match_type::FULL, true, EXPECT (expected));
CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
symbol_name_match_type::FULL, true, EXPECT (expected));
CHECK_MATCH ("foo < char * > ( int ) const",
symbol_name_match_type::WILD, true, EXPECT (expected));
CHECK_MATCH ("foo < char * > ( int ) &&",
symbol_name_match_type::WILD, true, EXPECT (expected));
}
/* Test lookup names that don't match anything. */
{
CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
{});
CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
{});
}
/* Some wild matching tests, exercising "(anonymous namespace)",
which should not be confused with a parameter list. */
{
static const char *syms[] = {
"A::B::C",
"B::C",
"C",
"A :: B :: C ( int )",
"B :: C ( int )",
"C ( int )",
};
for (const char *s : syms)
{
CHECK_MATCH (s, symbol_name_match_type::WILD, false,
EXPECT ("(anonymous namespace)::A::B::C"));
}
}
{
static const char expected[] = "ns2::tmpl<int>::foo2";
CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
EXPECT (expected));
CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
EXPECT (expected));
}
SELF_CHECK (!any_mismatch);
#undef EXPECT
#undef CHECK_MATCH
}
static void
run_test ()
{
test_mapped_index_find_name_component_bounds ();
test_dw2_expand_symtabs_matching_symbol ();
}
}} // namespace selftests::dw2_expand_symtabs_matching
#endif /* GDB_SELF_TEST */
/* If FILE_MATCHER is NULL or if PER_CU has
dwarf2_per_cu_quick_data::MARK set (see
dw_expand_symtabs_matching_file_matcher), expand the CU and call
EXPANSION_NOTIFY on it. */
static bool
dw2_expand_symtabs_matching_one
(dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
{
if (file_matcher == NULL || per_cu->v.quick->mark)
{
bool symtab_was_null = !per_objfile->symtab_set_p (per_cu);
compunit_symtab *symtab
= dw2_instantiate_symtab (per_cu, per_objfile, false);
gdb_assert (symtab != nullptr);
if (expansion_notify != NULL && symtab_was_null)
return expansion_notify (symtab);
}
return true;
}
/* Helper for dw2_expand_matching symtabs. Called on each symbol
matched, to expand corresponding CUs that were marked. IDX is the
index of the symbol name that matched. */
static bool
dw2_expand_marked_cus
(dwarf2_per_objfile *per_objfile, offset_type idx,
gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
block_search_flags search_flags,
search_domain kind)
{
offset_type vec_len, vec_idx;
bool global_seen = false;
mapped_index &index = *per_objfile->per_bfd->index_table;
offset_view vec (index.constant_pool.slice (index.symbol_vec_index (idx)));
vec_len = vec[0];
for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
{
offset_type cu_index_and_attrs = vec[vec_idx + 1];
/* This value is only valid for index versions >= 7. */
int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
gdb_index_symbol_kind symbol_kind =
GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
/* Only check the symbol attributes if they're present.
Indices prior to version 7 don't record them,
and indices >= 7 may elide them for certain symbols
(gold does this). */
int attrs_valid =
(index.version >= 7
&& symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
/* Work around gold/15646. */
if (attrs_valid
&& !is_static
&& symbol_kind == GDB_INDEX_SYMBOL_KIND_TYPE)
{
if (global_seen)
continue;
global_seen = true;
}
/* Only check the symbol's kind if it has one. */
if (attrs_valid)
{
if (is_static)
{
if ((search_flags & SEARCH_STATIC_BLOCK) == 0)
continue;
}
else
{
if ((search_flags & SEARCH_GLOBAL_BLOCK) == 0)
continue;
}
switch (kind)
{
case VARIABLES_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
continue;
break;
case FUNCTIONS_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
continue;
break;
case TYPES_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
continue;
break;
case MODULES_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
continue;
break;
default:
break;
}
}
/* Don't crash on bad data. */
if (cu_index >= per_objfile->per_bfd->all_comp_units.size ())
{
complaint (_(".gdb_index entry has bad CU index"
" [in module %s]"), objfile_name (per_objfile->objfile));
continue;
}
dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cu (cu_index);
if (!dw2_expand_symtabs_matching_one (per_cu, per_objfile, file_matcher,
expansion_notify))
return false;
}
return true;
}
/* If FILE_MATCHER is non-NULL, set all the
dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
that match FILE_MATCHER. */
static void
dw_expand_symtabs_matching_file_matcher
(dwarf2_per_objfile *per_objfile,
gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
{
if (file_matcher == NULL)
return;
htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
htab_eq_pointer,
NULL, xcalloc, xfree));
htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
htab_eq_pointer,
NULL, xcalloc, xfree));
/* The rule is CUs specify all the files, including those used by
any TU, so there's no need to scan TUs here. */
for (const auto &per_cu : per_objfile->per_bfd->all_comp_units)
{
QUIT;
if (per_cu->is_debug_types)
continue;
per_cu->v.quick->mark = 0;
/* We only need to look at symtabs not already expanded. */
if (per_objfile->symtab_set_p (per_cu.get ()))
continue;
quick_file_names *file_data = dw2_get_file_names (per_cu.get (),
per_objfile);
if (file_data == NULL)
continue;
if (htab_find (visited_not_found.get (), file_data) != NULL)
continue;
else if (htab_find (visited_found.get (), file_data) != NULL)
{
per_cu->v.quick->mark = 1;
continue;
}
for (int j = 0; j < file_data->num_file_names; ++j)
{
const char *this_real_name;
if (file_matcher (file_data->file_names[j], false))
{
per_cu->v.quick->mark = 1;
break;
}
/* Before we invoke realpath, which can get expensive when many
files are involved, do a quick comparison of the basenames. */
if (!basenames_may_differ
&& !file_matcher (lbasename (file_data->file_names[j]),
true))
continue;
this_real_name = dw2_get_real_path (per_objfile, file_data, j);
if (file_matcher (this_real_name, false))
{
per_cu->v.quick->mark = 1;
break;
}
}
void **slot = htab_find_slot (per_cu->v.quick->mark
? visited_found.get ()
: visited_not_found.get (),
file_data, INSERT);
*slot = file_data;
}
}
bool
dwarf2_gdb_index::expand_symtabs_matching
(struct objfile *objfile,
gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
const lookup_name_info *lookup_name,
gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
block_search_flags search_flags,
domain_enum domain,
enum search_domain kind)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
/* index_table is NULL if OBJF_READNOW. */
if (!per_objfile->per_bfd->index_table)
return true;
dw_expand_symtabs_matching_file_matcher (per_objfile, file_matcher);
/* This invariant is documented in quick-functions.h. */
gdb_assert (lookup_name != nullptr || symbol_matcher == nullptr);
if (lookup_name == nullptr)
{
for (dwarf2_per_cu_data *per_cu
: all_comp_units_range (per_objfile->per_bfd))
{
QUIT;
if (!dw2_expand_symtabs_matching_one (per_cu, per_objfile,
file_matcher,
expansion_notify))
return false;
}
return true;
}
mapped_index &index = *per_objfile->per_bfd->index_table;
bool result
= dw2_expand_symtabs_matching_symbol (index, *lookup_name,
symbol_matcher,
[&] (offset_type idx)
{
if (!dw2_expand_marked_cus (per_objfile, idx, file_matcher,
expansion_notify, search_flags, kind))
return false;
return true;
}, per_objfile);
return result;
}
/* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
symtab. */
static struct compunit_symtab *
recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
CORE_ADDR pc)
{
int i;
if (COMPUNIT_BLOCKVECTOR (cust) != NULL
&& blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
return cust;
if (cust->includes == NULL)
return NULL;
for (i = 0; cust->includes[i]; ++i)
{
struct compunit_symtab *s = cust->includes[i];
s = recursively_find_pc_sect_compunit_symtab (s, pc);
if (s != NULL)
return s;
}
return NULL;
}
struct compunit_symtab *
dwarf2_base_index_functions::find_pc_sect_compunit_symtab
(struct objfile *objfile,
struct bound_minimal_symbol msymbol,
CORE_ADDR pc,
struct obj_section *section,
int warn_if_readin)
{
struct dwarf2_per_cu_data *data;
struct compunit_symtab *result;
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
if (per_objfile->per_bfd->index_addrmap == nullptr)
return NULL;
CORE_ADDR baseaddr = objfile->text_section_offset ();
data = ((struct dwarf2_per_cu_data *)
addrmap_find (per_objfile->per_bfd->index_addrmap,
pc - baseaddr));
if (!data)
return NULL;
if (warn_if_readin && per_objfile->symtab_set_p (data))
warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
paddress (objfile->arch (), pc));
result = recursively_find_pc_sect_compunit_symtab
(dw2_instantiate_symtab (data, per_objfile, false), pc);
gdb_assert (result != NULL);
return result;
}
void
dwarf2_base_index_functions::map_symbol_filenames
(struct objfile *objfile,
gdb::function_view<symbol_filename_ftype> fun,
bool need_fullname)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
/* Use caches to ensure we only call FUN once for each filename. */
filename_seen_cache filenames_cache;
std::unordered_set<quick_file_names *> qfn_cache;
/* The rule is CUs specify all the files, including those used by any TU,
so there's no need to scan TUs here. We can ignore file names coming
from already-expanded CUs. It is possible that an expanded CU might
reuse the file names data from a currently unexpanded CU, in this
case we don't want to report the files from the unexpanded CU. */
for (const auto &per_cu : per_objfile->per_bfd->all_comp_units)
{
if (!per_cu->is_debug_types
&& per_objfile->symtab_set_p (per_cu.get ()))
{
if (per_cu->v.quick->file_names != nullptr)
qfn_cache.insert (per_cu->v.quick->file_names);
}
}
for (dwarf2_per_cu_data *per_cu
: all_comp_units_range (per_objfile->per_bfd))
{
/* We only need to look at symtabs not already expanded. */
if (per_cu->is_debug_types || per_objfile->symtab_set_p (per_cu))
continue;
quick_file_names *file_data = dw2_get_file_names (per_cu, per_objfile);
if (file_data == nullptr
|| qfn_cache.find (file_data) != qfn_cache.end ())
continue;
for (int j = 0; j < file_data->num_file_names; ++j)
{
const char *filename = file_data->file_names[j];
const char *key = filename;
const char *fullname = nullptr;
if (need_fullname)
{
fullname = dw2_get_real_path (per_objfile, file_data, j);
key = fullname;
}
if (!filenames_cache.seen (key))
fun (filename, fullname);
}
}
}
bool
dwarf2_base_index_functions::has_symbols (struct objfile *objfile)
{
return true;
}
/* See quick_symbol_functions::has_unexpanded_symtabs in quick-symbol.h. */
bool
dwarf2_base_index_functions::has_unexpanded_symtabs (struct objfile *objfile)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
for (const auto &per_cu : per_objfile->per_bfd->all_comp_units)
{
/* Is this already expanded? */
if (per_objfile->symtab_set_p (per_cu.get ()))
continue;
/* It has not yet been expanded. */
return true;
}
return false;
}
/* DWARF-5 debug_names reader. */
/* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
/* A helper function that reads the .debug_names section in SECTION
and fills in MAP. FILENAME is the name of the file containing the
section; it is used for error reporting.
Returns true if all went well, false otherwise. */
static bool
read_debug_names_from_section (struct objfile *objfile,
const char *filename,
struct dwarf2_section_info *section,
mapped_debug_names &map)
{
if (section->empty ())
return false;
/* Older elfutils strip versions could keep the section in the main
executable while splitting it for the separate debug info file. */
if ((section->get_flags () & SEC_HAS_CONTENTS) == 0)
return false;
section->read (objfile);
map.dwarf5_byte_order = gdbarch_byte_order (objfile->arch ());
const gdb_byte *addr = section->buffer;
bfd *const abfd = section->get_bfd_owner ();
unsigned int bytes_read;
LONGEST length = read_initial_length (abfd, addr, &bytes_read);
addr += bytes_read;
map.dwarf5_is_dwarf64 = bytes_read != 4;
map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
if (bytes_read + length != section->size)
{
/* There may be multiple per-CU indices. */
warning (_("Section .debug_names in %s length %s does not match "
"section length %s, ignoring .debug_names."),
filename, plongest (bytes_read + length),
pulongest (section->size));
return false;
}
/* The version number. */
uint16_t version = read_2_bytes (abfd, addr);
addr += 2;
if (version != 5)
{
warning (_("Section .debug_names in %s has unsupported version %d, "
"ignoring .debug_names."),
filename, version);
return false;
}
/* Padding. */
uint16_t padding = read_2_bytes (abfd, addr);
addr += 2;
if (padding != 0)
{
warning (_("Section .debug_names in %s has unsupported padding %d, "
"ignoring .debug_names."),
filename, padding);
return false;
}
/* comp_unit_count - The number of CUs in the CU list. */
map.cu_count = read_4_bytes (abfd, addr);
addr += 4;
/* local_type_unit_count - The number of TUs in the local TU
list. */
map.tu_count = read_4_bytes (abfd, addr);
addr += 4;
/* foreign_type_unit_count - The number of TUs in the foreign TU
list. */
uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
addr += 4;
if (foreign_tu_count != 0)
{
warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
"ignoring .debug_names."),
filename, static_cast<unsigned long> (foreign_tu_count));
return false;
}
/* bucket_count - The number of hash buckets in the hash lookup
table. */
map.bucket_count = read_4_bytes (abfd, addr);
addr += 4;
/* name_count - The number of unique names in the index. */
map.name_count = read_4_bytes (abfd, addr);
addr += 4;
/* abbrev_table_size - The size in bytes of the abbreviations
table. */
uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
addr += 4;
/* augmentation_string_size - The size in bytes of the augmentation
string. This value is rounded up to a multiple of 4. */
uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
addr += 4;
map.augmentation_is_gdb = ((augmentation_string_size
== sizeof (dwarf5_augmentation))
&& memcmp (addr, dwarf5_augmentation,
sizeof (dwarf5_augmentation)) == 0);
augmentation_string_size += (-augmentation_string_size) & 3;
addr += augmentation_string_size;
/* List of CUs */
map.cu_table_reordered = addr;
addr += map.cu_count * map.offset_size;
/* List of Local TUs */
map.tu_table_reordered = addr;
addr += map.tu_count * map.offset_size;
/* Hash Lookup Table */
map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
addr += map.bucket_count * 4;
map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
addr += map.name_count * 4;
/* Name Table */
map.name_table_string_offs_reordered = addr;
addr += map.name_count * map.offset_size;
map.name_table_entry_offs_reordered = addr;
addr += map.name_count * map.offset_size;
const gdb_byte *abbrev_table_start = addr;
for (;;)
{
const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
addr += bytes_read;
if (index_num == 0)
break;
const auto insertpair
= map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
if (!insertpair.second)
{
warning (_("Section .debug_names in %s has duplicate index %s, "
"ignoring .debug_names."),
filename, pulongest (index_num));
return false;
}
mapped_debug_names::index_val &indexval = insertpair.first->second;
indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
addr += bytes_read;
for (;;)
{
mapped_debug_names::index_val::attr attr;
attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
addr += bytes_read;
attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
addr += bytes_read;
if (attr.form == DW_FORM_implicit_const)
{
attr.implicit_const = read_signed_leb128 (abfd, addr,
&bytes_read);
addr += bytes_read;
}
if (attr.dw_idx == 0 && attr.form == 0)
break;
indexval.attr_vec.push_back (std::move (attr));
}
}
if (addr != abbrev_table_start + abbrev_table_size)
{
warning (_("Section .debug_names in %s has abbreviation_table "
"of size %s vs. written as %u, ignoring .debug_names."),
filename, plongest (addr - abbrev_table_start),
abbrev_table_size);
return false;
}
map.entry_pool = addr;
return true;
}
/* A helper for create_cus_from_debug_names that handles the MAP's CU
list. */
static void
create_cus_from_debug_names_list (dwarf2_per_bfd *per_bfd,
const mapped_debug_names &map,
dwarf2_section_info &section,
bool is_dwz)
{
if (!map.augmentation_is_gdb)
{
for (uint32_t i = 0; i < map.cu_count; ++i)
{
sect_offset sect_off
= (sect_offset) (extract_unsigned_integer
(map.cu_table_reordered + i * map.offset_size,
map.offset_size,
map.dwarf5_byte_order));
/* We don't know the length of the CU, because the CU list in a
.debug_names index can be incomplete, so we can't use the start
of the next CU as end of this CU. We create the CUs here with
length 0, and in cutu_reader::cutu_reader we'll fill in the
actual length. */
dwarf2_per_cu_data_up per_cu
= create_cu_from_index_list (per_bfd, &section, is_dwz,
sect_off, 0);
per_bfd->all_comp_units.push_back (std::move (per_cu));
}
return;
}
sect_offset sect_off_prev;
for (uint32_t i = 0; i <= map.cu_count; ++i)
{
sect_offset sect_off_next;
if (i < map.cu_count)
{
sect_off_next
= (sect_offset) (extract_unsigned_integer
(map.cu_table_reordered + i * map.offset_size,
map.offset_size,
map.dwarf5_byte_order));
}
else
sect_off_next = (sect_offset) section.size;
if (i >= 1)
{
const ULONGEST length = sect_off_next - sect_off_prev;
dwarf2_per_cu_data_up per_cu
= create_cu_from_index_list (per_bfd, &section, is_dwz,
sect_off_prev, length);
per_bfd->all_comp_units.push_back (std::move (per_cu));
}
sect_off_prev = sect_off_next;
}
}
/* Read the CU list from the mapped index, and use it to create all
the CU objects for this dwarf2_per_objfile. */
static void
create_cus_from_debug_names (dwarf2_per_bfd *per_bfd,
const mapped_debug_names &map,
const mapped_debug_names &dwz_map)
{
gdb_assert (per_bfd->all_comp_units.empty ());
per_bfd->all_comp_units.reserve (map.cu_count + dwz_map.cu_count);
create_cus_from_debug_names_list (per_bfd, map, per_bfd->info,
false /* is_dwz */);
if (dwz_map.cu_count == 0)
return;
dwz_file *dwz = dwarf2_get_dwz_file (per_bfd);
create_cus_from_debug_names_list (per_bfd, dwz_map, dwz->info,
true /* is_dwz */);
}
/* Read .debug_names. If everything went ok, initialize the "quick"
elements of all the CUs and return true. Otherwise, return false. */
static bool
dwarf2_read_debug_names (dwarf2_per_objfile *per_objfile)
{
std::unique_ptr<mapped_debug_names> map (new mapped_debug_names);
mapped_debug_names dwz_map;
struct objfile *objfile = per_objfile->objfile;
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
if (!read_debug_names_from_section (objfile, objfile_name (objfile),
&per_bfd->debug_names, *map))
return false;
/* Don't use the index if it's empty. */
if (map->name_count == 0)
return false;
/* If there is a .dwz file, read it so we can get its CU list as
well. */
dwz_file *dwz = dwarf2_get_dwz_file (per_bfd);
if (dwz != NULL)
{
if (!read_debug_names_from_section (objfile,
bfd_get_filename (dwz->dwz_bfd.get ()),
&dwz->debug_names, dwz_map))
{
warning (_("could not read '.debug_names' section from %s; skipping"),
bfd_get_filename (dwz->dwz_bfd.get ()));
return false;
}
}
create_cus_from_debug_names (per_bfd, *map, dwz_map);
if (map->tu_count != 0)
{
/* We can only handle a single .debug_types when we have an
index. */
if (per_bfd->types.size () != 1)
return false;
dwarf2_section_info *section = &per_bfd->types[0];
create_signatured_type_table_from_debug_names
(per_objfile, *map, section, &per_bfd->abbrev);
}
create_addrmap_from_aranges (per_objfile, &per_bfd->debug_aranges);
per_bfd->debug_names_table = std::move (map);
per_bfd->using_index = 1;
per_bfd->quick_file_names_table =
create_quick_file_names_table (per_bfd->all_comp_units.size ());
return true;
}
/* Type used to manage iterating over all CUs looking for a symbol for
.debug_names. */
class dw2_debug_names_iterator
{
public:
dw2_debug_names_iterator (const mapped_debug_names &map,
block_search_flags block_index,
domain_enum domain,
const char *name, dwarf2_per_objfile *per_objfile)
: m_map (map), m_block_index (block_index), m_domain (domain),
m_addr (find_vec_in_debug_names (map, name, per_objfile)),
m_per_objfile (per_objfile)
{}
dw2_debug_names_iterator (const mapped_debug_names &map,
search_domain search, uint32_t namei,
dwarf2_per_objfile *per_objfile,
domain_enum domain = UNDEF_DOMAIN)
: m_map (map),
m_domain (domain),
m_search (search),
m_addr (find_vec_in_debug_names (map, namei, per_objfile)),
m_per_objfile (per_objfile)
{}
dw2_debug_names_iterator (const mapped_debug_names &map,
block_search_flags block_index, domain_enum domain,
uint32_t namei, dwarf2_per_objfile *per_objfile)
: m_map (map), m_block_index (block_index), m_domain (domain),
m_addr (find_vec_in_debug_names (map, namei, per_objfile)),
m_per_objfile (per_objfile)
{}
/* Return the next matching CU or NULL if there are no more. */
dwarf2_per_cu_data *next ();
private:
static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
const char *name,
dwarf2_per_objfile *per_objfile);
static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
uint32_t namei,
dwarf2_per_objfile *per_objfile);
/* The internalized form of .debug_names. */
const mapped_debug_names &m_map;
/* Restrict the search to these blocks. */
block_search_flags m_block_index = (SEARCH_GLOBAL_BLOCK
| SEARCH_STATIC_BLOCK);
/* The kind of symbol we're looking for. */
const domain_enum m_domain = UNDEF_DOMAIN;
const search_domain m_search = ALL_DOMAIN;
/* The list of CUs from the index entry of the symbol, or NULL if
not found. */
const gdb_byte *m_addr;
dwarf2_per_objfile *m_per_objfile;
};
const char *
mapped_debug_names::namei_to_name
(uint32_t namei, dwarf2_per_objfile *per_objfile) const
{
const ULONGEST namei_string_offs
= extract_unsigned_integer ((name_table_string_offs_reordered
+ namei * offset_size),
offset_size,
dwarf5_byte_order);
return read_indirect_string_at_offset (per_objfile, namei_string_offs);
}
/* Find a slot in .debug_names for the object named NAME. If NAME is
found, return pointer to its pool data. If NAME cannot be found,
return NULL. */
const gdb_byte *
dw2_debug_names_iterator::find_vec_in_debug_names
(const mapped_debug_names &map, const char *name,
dwarf2_per_objfile *per_objfile)
{
int (*cmp) (const char *, const char *);
gdb::unique_xmalloc_ptr<char> without_params;
if (current_language->la_language == language_cplus
|| current_language->la_language == language_fortran
|| current_language->la_language == language_d)
{
/* NAME is already canonical. Drop any qualifiers as
.debug_names does not contain any. */
if (strchr (name, '(') != NULL)
{
without_params = cp_remove_params (name);
if (without_params != NULL)
name = without_params.get ();
}
}
cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
const uint32_t full_hash = dwarf5_djb_hash (name);
uint32_t namei
= extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
(map.bucket_table_reordered
+ (full_hash % map.bucket_count)), 4,
map.dwarf5_byte_order);
if (namei == 0)
return NULL;
--namei;
if (namei >= map.name_count)
{
complaint (_("Wrong .debug_names with name index %u but name_count=%u "
"[in module %s]"),
namei, map.name_count,
objfile_name (per_objfile->objfile));
return NULL;
}
for (;;)
{
const uint32_t namei_full_hash
= extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
(map.hash_table_reordered + namei), 4,
map.dwarf5_byte_order);
if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
return NULL;
if (full_hash == namei_full_hash)
{
const char *const namei_string = map.namei_to_name (namei, per_objfile);
#if 0 /* An expensive sanity check. */
if (namei_full_hash != dwarf5_djb_hash (namei_string))
{
complaint (_("Wrong .debug_names hash for string at index %u "
"[in module %s]"),
namei, objfile_name (dwarf2_per_objfile->objfile));
return NULL;
}
#endif
if (cmp (namei_string, name) == 0)
{
const ULONGEST namei_entry_offs
= extract_unsigned_integer ((map.name_table_entry_offs_reordered
+ namei * map.offset_size),
map.offset_size, map.dwarf5_byte_order);
return map.entry_pool + namei_entry_offs;
}
}
++namei;
if (namei >= map.name_count)
return NULL;
}
}
const gdb_byte *
dw2_debug_names_iterator::find_vec_in_debug_names
(const mapped_debug_names &map, uint32_t namei, dwarf2_per_objfile *per_objfile)
{
if (namei >= map.name_count)
{
complaint (_("Wrong .debug_names with name index %u but name_count=%u "
"[in module %s]"),
namei, map.name_count,
objfile_name (per_objfile->objfile));
return NULL;
}
const ULONGEST namei_entry_offs
= extract_unsigned_integer ((map.name_table_entry_offs_reordered
+ namei * map.offset_size),
map.offset_size, map.dwarf5_byte_order);
return map.entry_pool + namei_entry_offs;
}
/* See dw2_debug_names_iterator. */
dwarf2_per_cu_data *
dw2_debug_names_iterator::next ()
{
if (m_addr == NULL)
return NULL;
dwarf2_per_bfd *per_bfd = m_per_objfile->per_bfd;
struct objfile *objfile = m_per_objfile->objfile;
bfd *const abfd = objfile->obfd;
again:
unsigned int bytes_read;
const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
m_addr += bytes_read;
if (abbrev == 0)
return NULL;
const auto indexval_it = m_map.abbrev_map.find (abbrev);
if (indexval_it == m_map.abbrev_map.cend ())
{
complaint (_("Wrong .debug_names undefined abbrev code %s "
"[in module %s]"),
pulongest (abbrev), objfile_name (objfile));
return NULL;
}
const mapped_debug_names::index_val &indexval = indexval_it->second;
enum class symbol_linkage {
unknown,
static_,
extern_,
} symbol_linkage_ = symbol_linkage::unknown;
dwarf2_per_cu_data *per_cu = NULL;
for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
{
ULONGEST ull;
switch (attr.form)
{
case DW_FORM_implicit_const:
ull = attr.implicit_const;
break;
case DW_FORM_flag_present:
ull = 1;
break;
case DW_FORM_udata:
ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
m_addr += bytes_read;
break;
case DW_FORM_ref4:
ull = read_4_bytes (abfd, m_addr);
m_addr += 4;
break;
case DW_FORM_ref8:
ull = read_8_bytes (abfd, m_addr);
m_addr += 8;
break;
case DW_FORM_ref_sig8:
ull = read_8_bytes (abfd, m_addr);
m_addr += 8;
break;
default:
complaint (_("Unsupported .debug_names form %s [in module %s]"),
dwarf_form_name (attr.form),
objfile_name (objfile));
return NULL;
}
switch (attr.dw_idx)
{
case DW_IDX_compile_unit:
/* Don't crash on bad data. */
if (ull >= per_bfd->all_comp_units.size ())
{
complaint (_(".debug_names entry has bad CU index %s"
" [in module %s]"),
pulongest (ull),
objfile_name (objfile));
continue;
}
per_cu = per_bfd->get_cu (ull);
break;
case DW_IDX_type_unit:
/* Don't crash on bad data. */
if (ull >= per_bfd->tu_stats.nr_tus)
{
complaint (_(".debug_names entry has bad TU index %s"
" [in module %s]"),
pulongest (ull),
objfile_name (objfile));
continue;
}
per_cu = per_bfd->get_cu (ull + per_bfd->tu_stats.nr_tus);
break;
case DW_IDX_die_offset:
/* In a per-CU index (as opposed to a per-module index), index
entries without CU attribute implicitly refer to the single CU. */
if (per_cu == NULL)
per_cu = per_bfd->get_cu (0);
break;
case DW_IDX_GNU_internal:
if (!m_map.augmentation_is_gdb)
break;
symbol_linkage_ = symbol_linkage::static_;
break;
case DW_IDX_GNU_external:
if (!m_map.augmentation_is_gdb)
break;
symbol_linkage_ = symbol_linkage::extern_;
break;
}
}
/* Skip if already read in. */
if (m_per_objfile->symtab_set_p (per_cu))
goto again;
/* Check static vs global. */
if (symbol_linkage_ != symbol_linkage::unknown)
{
if (symbol_linkage_ == symbol_linkage::static_)
{
if ((m_block_index & SEARCH_STATIC_BLOCK) == 0)
goto again;
}
else
{
if ((m_block_index & SEARCH_GLOBAL_BLOCK) == 0)
goto again;
}
}
/* Match dw2_symtab_iter_next, symbol_kind
and debug_names::psymbol_tag. */
switch (m_domain)
{
case VAR_DOMAIN:
switch (indexval.dwarf_tag)
{
case DW_TAG_variable:
case DW_TAG_subprogram:
/* Some types are also in VAR_DOMAIN. */
case DW_TAG_typedef:
case DW_TAG_structure_type:
break;
default:
goto again;
}
break;
case STRUCT_DOMAIN:
switch (indexval.dwarf_tag)
{
case DW_TAG_typedef:
case DW_TAG_structure_type:
break;
default:
goto again;
}
break;
case LABEL_DOMAIN:
switch (indexval.dwarf_tag)
{
case 0:
case DW_TAG_variable:
break;
default:
goto again;
}
break;
case MODULE_DOMAIN:
switch (indexval.dwarf_tag)
{
case DW_TAG_module:
break;
default:
goto again;
}
break;
default:
break;
}
/* Match dw2_expand_symtabs_matching, symbol_kind and
debug_names::psymbol_tag. */
switch (m_search)
{
case VARIABLES_DOMAIN:
switch (indexval.dwarf_tag)
{
case DW_TAG_variable:
break;
default:
goto again;
}
break;
case FUNCTIONS_DOMAIN:
switch (indexval.dwarf_tag)
{
case DW_TAG_subprogram:
break;
default:
goto again;
}
break;
case TYPES_DOMAIN:
switch (indexval.dwarf_tag)
{
case DW_TAG_typedef:
case DW_TAG_structure_type:
break;
default:
goto again;
}
break;
case MODULES_DOMAIN:
switch (indexval.dwarf_tag)
{
case DW_TAG_module:
break;
default:
goto again;
}
default:
break;
}
return per_cu;
}
/* This dumps minimal information about .debug_names. It is called
via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
uses this to verify that .debug_names has been loaded. */
void
dwarf2_debug_names_index::dump (struct objfile *objfile)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
gdb_assert (per_objfile->per_bfd->using_index);
printf_filtered (".debug_names:");
if (per_objfile->per_bfd->debug_names_table)
printf_filtered (" exists\n");
else
printf_filtered (" faked for \"readnow\"\n");
printf_filtered ("\n");
}
void
dwarf2_debug_names_index::expand_matching_symbols
(struct objfile *objfile,
const lookup_name_info &name, domain_enum domain,
int global,
symbol_compare_ftype *ordered_compare)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
/* debug_names_table is NULL if OBJF_READNOW. */
if (!per_objfile->per_bfd->debug_names_table)
return;
mapped_debug_names &map = *per_objfile->per_bfd->debug_names_table;
const block_search_flags block_flags
= global ? SEARCH_GLOBAL_BLOCK : SEARCH_STATIC_BLOCK;
const char *match_name = name.ada ().lookup_name ().c_str ();
auto matcher = [&] (const char *symname)
{
if (ordered_compare == nullptr)
return true;
return ordered_compare (symname, match_name) == 0;
};
dw2_expand_symtabs_matching_symbol (map, name, matcher,
[&] (offset_type namei)
{
/* The name was matched, now expand corresponding CUs that were
marked. */
dw2_debug_names_iterator iter (map, block_flags, domain, namei,
per_objfile);
struct dwarf2_per_cu_data *per_cu;
while ((per_cu = iter.next ()) != NULL)
dw2_expand_symtabs_matching_one (per_cu, per_objfile, nullptr,
nullptr);
return true;
}, per_objfile);
}
bool
dwarf2_debug_names_index::expand_symtabs_matching
(struct objfile *objfile,
gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
const lookup_name_info *lookup_name,
gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
block_search_flags search_flags,
domain_enum domain,
enum search_domain kind)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
/* debug_names_table is NULL if OBJF_READNOW. */
if (!per_objfile->per_bfd->debug_names_table)
return true;
dw_expand_symtabs_matching_file_matcher (per_objfile, file_matcher);
/* This invariant is documented in quick-functions.h. */
gdb_assert (lookup_name != nullptr || symbol_matcher == nullptr);
if (lookup_name == nullptr)
{
for (dwarf2_per_cu_data *per_cu
: all_comp_units_range (per_objfile->per_bfd))
{
QUIT;
if (!dw2_expand_symtabs_matching_one (per_cu, per_objfile,
file_matcher,
expansion_notify))
return false;
}
return true;
}
mapped_debug_names &map = *per_objfile->per_bfd->debug_names_table;
bool result
= dw2_expand_symtabs_matching_symbol (map, *lookup_name,
symbol_matcher,
[&] (offset_type namei)
{
/* The name was matched, now expand corresponding CUs that were
marked. */
dw2_debug_names_iterator iter (map, kind, namei, per_objfile, domain);
struct dwarf2_per_cu_data *per_cu;
while ((per_cu = iter.next ()) != NULL)
if (!dw2_expand_symtabs_matching_one (per_cu, per_objfile,
file_matcher,
expansion_notify))
return false;
return true;
}, per_objfile);
return result;
}
/* Get the content of the .gdb_index section of OBJ. SECTION_OWNER should point
to either a dwarf2_per_bfd or dwz_file object. */
template <typename T>
static gdb::array_view<const gdb_byte>
get_gdb_index_contents_from_section (objfile *obj, T *section_owner)
{
dwarf2_section_info *section = &section_owner->gdb_index;
if (section->empty ())
return {};
/* Older elfutils strip versions could keep the section in the main
executable while splitting it for the separate debug info file. */
if ((section->get_flags () & SEC_HAS_CONTENTS) == 0)
return {};
section->read (obj);
/* dwarf2_section_info::size is a bfd_size_type, while
gdb::array_view works with size_t. On 32-bit hosts, with
--enable-64-bit-bfd, bfd_size_type is a 64-bit type, while size_t
is 32-bit. So we need an explicit narrowing conversion here.
This is fine, because it's impossible to allocate or mmap an
array/buffer larger than what size_t can represent. */
return gdb::make_array_view (section->buffer, section->size);
}
/* Lookup the index cache for the contents of the index associated to
DWARF2_OBJ. */
static gdb::array_view<const gdb_byte>
get_gdb_index_contents_from_cache (objfile *obj, dwarf2_per_bfd *dwarf2_per_bfd)
{
const bfd_build_id *build_id = build_id_bfd_get (obj->obfd);
if (build_id == nullptr)
return {};
return global_index_cache.lookup_gdb_index (build_id,
&dwarf2_per_bfd->index_cache_res);
}
/* Same as the above, but for DWZ. */
static gdb::array_view<const gdb_byte>
get_gdb_index_contents_from_cache_dwz (objfile *obj, dwz_file *dwz)
{
const bfd_build_id *build_id = build_id_bfd_get (dwz->dwz_bfd.get ());
if (build_id == nullptr)
return {};
return global_index_cache.lookup_gdb_index (build_id, &dwz->index_cache_res);
}
/* See dwarf2/public.h. */
void
dwarf2_initialize_objfile (struct objfile *objfile)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
dwarf_read_debug_printf ("called");
/* If we're about to read full symbols, don't bother with the
indices. In this case we also don't care if some other debug
format is making psymtabs, because they are all about to be
expanded anyway. */
if ((objfile->flags & OBJF_READNOW))
{
dwarf_read_debug_printf ("readnow requested");
/* When using READNOW, the using_index flag (set below) indicates that
PER_BFD was already initialized, when we loaded some other objfile. */
if (per_bfd->using_index)
{
dwarf_read_debug_printf ("using_index already set");
objfile->qf.push_front (make_dwarf_gdb_index ());
return;
}
per_bfd->using_index = 1;
create_all_comp_units (per_objfile);
per_bfd->quick_file_names_table
= create_quick_file_names_table (per_bfd->all_comp_units.size ());
for (int i = 0; i < per_bfd->all_comp_units.size (); ++i)
{
dwarf2_per_cu_data *per_cu = per_bfd->get_cu (i);
per_cu->v.quick = OBSTACK_ZALLOC (&per_bfd->obstack,
struct dwarf2_per_cu_quick_data);
}
/* Arrange for gdb to see the "quick" functions. However, these
functions will be no-ops because we will have expanded all
symtabs. */
objfile->qf.push_front (make_dwarf_gdb_index ());
return;
}
/* Was a debug names index already read when we processed an objfile sharing
PER_BFD? */
if (per_bfd->debug_names_table != nullptr)
{
dwarf_read_debug_printf ("re-using shared debug names table");
objfile->qf.push_front (make_dwarf_debug_names ());
return;
}
/* Was a GDB index already read when we processed an objfile sharing
PER_BFD? */
if (per_bfd->index_table != nullptr)
{
dwarf_read_debug_printf ("re-using shared index table");
objfile->qf.push_front (make_dwarf_gdb_index ());
return;
}
/* There might already be partial symtabs built for this BFD. This happens
when loading the same binary twice with the index-cache enabled. If so,
don't try to read an index. The objfile / per_objfile initialization will
be completed in dwarf2_build_psymtabs, in the standard partial symtabs
code path. */
if (per_bfd->partial_symtabs != nullptr)
{
dwarf_read_debug_printf ("re-using shared partial symtabs");
objfile->qf.push_front (make_lazy_dwarf_reader ());
return;
}
if (dwarf2_read_debug_names (per_objfile))
{
dwarf_read_debug_printf ("found debug names");
objfile->qf.push_front (make_dwarf_debug_names ());
return;
}
if (dwarf2_read_gdb_index (per_objfile,
get_gdb_index_contents_from_section<struct dwarf2_per_bfd>,
get_gdb_index_contents_from_section<dwz_file>))
{
dwarf_read_debug_printf ("found gdb index from file");
objfile->qf.push_front (make_dwarf_gdb_index ());
return;
}
/* ... otherwise, try to find the index in the index cache. */
if (dwarf2_read_gdb_index (per_objfile,
get_gdb_index_contents_from_cache,
get_gdb_index_contents_from_cache_dwz))
{
dwarf_read_debug_printf ("found gdb index from cache");
global_index_cache.hit ();
objfile->qf.push_front (make_dwarf_gdb_index ());
return;
}
global_index_cache.miss ();
objfile->qf.push_front (make_lazy_dwarf_reader ());
}
/* Build a partial symbol table. */
void
dwarf2_build_psymtabs (struct objfile *objfile, psymbol_functions *psf)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
if (per_bfd->partial_symtabs != nullptr)
{
/* Partial symbols were already read, so now we can simply
attach them. */
if (psf == nullptr)
{
psf = new psymbol_functions (per_bfd->partial_symtabs);
objfile->qf.emplace_front (psf);
}
else
psf->set_partial_symtabs (per_bfd->partial_symtabs);
return;
}
if (psf == nullptr)
{
psf = new psymbol_functions;
objfile->qf.emplace_front (psf);
}
const std::shared_ptr<psymtab_storage> &partial_symtabs
= psf->get_partial_symtabs ();
/* Set the local reference to partial symtabs, so that we don't try
to read them again if reading another objfile with the same BFD.
If we can't in fact share, this won't make a difference anyway as
the dwarf2_per_bfd object won't be shared. */
per_bfd->partial_symtabs = partial_symtabs;
try
{
/* This isn't really ideal: all the data we allocate on the
objfile's obstack is still uselessly kept around. However,
freeing it seems unsafe. */
psymtab_discarder psymtabs (partial_symtabs.get ());
dwarf2_build_psymtabs_hard (per_objfile);
psymtabs.keep ();
/* (maybe) store an index in the cache. */
global_index_cache.store (per_objfile);
}
catch (const gdb_exception_error &except)
{
exception_print (gdb_stderr, except);
}
}
/* Find the base address of the compilation unit for range lists and
location lists. It will normally be specified by DW_AT_low_pc.
In DWARF-3 draft 4, the base address could be overridden by
DW_AT_entry_pc. It's been removed, but GCC still uses this for
compilation units with discontinuous ranges. */
static void
dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
cu->base_address.reset ();
attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
if (attr != nullptr)
cu->base_address = attr->as_address ();
else
{
attr = dwarf2_attr (die, DW_AT_low_pc, cu);
if (attr != nullptr)
cu->base_address = attr->as_address ();
}
}
/* Helper function that returns the proper abbrev section for
THIS_CU. */
static struct dwarf2_section_info *
get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
{
struct dwarf2_section_info *abbrev;
dwarf2_per_bfd *per_bfd = this_cu->per_bfd;
if (this_cu->is_dwz)
abbrev = &dwarf2_get_dwz_file (per_bfd, true)->abbrev;
else
abbrev = &per_bfd->abbrev;
return abbrev;
}
/* Fetch the abbreviation table offset from a comp or type unit header. */
static sect_offset
read_abbrev_offset (dwarf2_per_objfile *per_objfile,
struct dwarf2_section_info *section,
sect_offset sect_off)
{
bfd *abfd = section->get_bfd_owner ();
const gdb_byte *info_ptr;
unsigned int initial_length_size, offset_size;
uint16_t version;
section->read (per_objfile->objfile);
info_ptr = section->buffer + to_underlying (sect_off);
read_initial_length (abfd, info_ptr, &initial_length_size);
offset_size = initial_length_size == 4 ? 4 : 8;
info_ptr += initial_length_size;
version = read_2_bytes (abfd, info_ptr);
info_ptr += 2;
if (version >= 5)
{
/* Skip unit type and address size. */
info_ptr += 2;
}
return (sect_offset) read_offset (abfd, info_ptr, offset_size);
}
/* A partial symtab that is used only for include files. */
struct dwarf2_include_psymtab : public partial_symtab
{
dwarf2_include_psymtab (const char *filename,
psymtab_storage *partial_symtabs,
objfile_per_bfd_storage *objfile_per_bfd)
: partial_symtab (filename, partial_symtabs, objfile_per_bfd)
{
}
void read_symtab (struct objfile *objfile) override
{
/* It's an include file, no symbols to read for it.
Everything is in the includer symtab. */
/* The expansion of a dwarf2_include_psymtab is just a trigger for
expansion of the includer psymtab. We use the dependencies[0] field to
model the includer. But if we go the regular route of calling
expand_psymtab here, and having expand_psymtab call expand_dependencies
to expand the includer, we'll only use expand_psymtab on the includer
(making it a non-toplevel psymtab), while if we expand the includer via
another path, we'll use read_symtab (making it a toplevel psymtab).
So, don't pretend a dwarf2_include_psymtab is an actual toplevel
psymtab, and trigger read_symtab on the includer here directly. */
includer ()->read_symtab (objfile);
}
void expand_psymtab (struct objfile *objfile) override
{
/* This is not called by read_symtab, and should not be called by any
expand_dependencies. */
gdb_assert (false);
}
bool readin_p (struct objfile *objfile) const override
{
return includer ()->readin_p (objfile);
}
compunit_symtab *get_compunit_symtab (struct objfile *objfile) const override
{
return nullptr;
}
private:
partial_symtab *includer () const
{
/* An include psymtab has exactly one dependency: the psymtab that
includes it. */
gdb_assert (this->number_of_dependencies == 1);
return this->dependencies[0];
}
};
/* Allocate a new partial symtab for file named NAME and mark this new
partial symtab as being an include of PST. */
static void
dwarf2_create_include_psymtab (dwarf2_per_bfd *per_bfd,
const char *name,
dwarf2_psymtab *pst,
psymtab_storage *partial_symtabs,
objfile_per_bfd_storage *objfile_per_bfd)
{
dwarf2_include_psymtab *subpst
= new dwarf2_include_psymtab (name, partial_symtabs, objfile_per_bfd);
if (!IS_ABSOLUTE_PATH (subpst->filename))
subpst->dirname = pst->dirname;
subpst->dependencies = per_bfd->partial_symtabs->allocate_dependencies (1);
subpst->dependencies[0] = pst;
subpst->number_of_dependencies = 1;
}
/* Read the Line Number Program data and extract the list of files
included by the source file represented by PST. Build an include
partial symtab for each of these included files. */
static void
dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
struct die_info *die,
const file_and_directory &fnd,
dwarf2_psymtab *pst)
{
line_header_up lh;
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
if (attr != nullptr && attr->form_is_unsigned ())
lh = dwarf_decode_line_header ((sect_offset) attr->as_unsigned (), cu);
if (lh == NULL)
return; /* No linetable, so no includes. */
/* NOTE: pst->dirname is DW_AT_comp_dir (if present). Also note
that we pass in the raw text_low here; that is ok because we're
only decoding the line table to make include partial symtabs, and
so the addresses aren't really used. */
dwarf_decode_lines (lh.get (), fnd, cu, pst,
pst->raw_text_low (), 1);
}
static hashval_t
hash_signatured_type (const void *item)
{
const struct signatured_type *sig_type
= (const struct signatured_type *) item;
/* This drops the top 32 bits of the signature, but is ok for a hash. */
return sig_type->signature;
}
static int
eq_signatured_type (const void *item_lhs, const void *item_rhs)
{
const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
return lhs->signature == rhs->signature;
}
/* Allocate a hash table for signatured types. */
static htab_up
allocate_signatured_type_table ()
{
return htab_up (htab_create_alloc (41,
hash_signatured_type,
eq_signatured_type,
NULL, xcalloc, xfree));
}
/* A helper for create_debug_types_hash_table. Read types from SECTION
and fill them into TYPES_HTAB. It will process only type units,
therefore DW_UT_type. */
static void
create_debug_type_hash_table (dwarf2_per_objfile *per_objfile,
struct dwo_file *dwo_file,
dwarf2_section_info *section, htab_up &types_htab,
rcuh_kind section_kind)
{
struct objfile *objfile = per_objfile->objfile;
struct dwarf2_section_info *abbrev_section;
bfd *abfd;
const gdb_byte *info_ptr, *end_ptr;
abbrev_section = &dwo_file->sections.abbrev;
dwarf_read_debug_printf ("Reading %s for %s",
section->get_name (),
abbrev_section->get_file_name ());
section->read (objfile);
info_ptr = section->buffer;
if (info_ptr == NULL)
return;
/* We can't set abfd until now because the section may be empty or
not present, in which case the bfd is unknown. */
abfd = section->get_bfd_owner ();
/* We don't use cutu_reader here because we don't need to read
any dies: the signature is in the header. */
end_ptr = info_ptr + section->size;
while (info_ptr < end_ptr)
{
signatured_type_up sig_type;
struct dwo_unit *dwo_tu;
void **slot;
const gdb_byte *ptr = info_ptr;
struct comp_unit_head header;
unsigned int length;
sect_offset sect_off = (sect_offset) (ptr - section->buffer);
/* Initialize it due to a false compiler warning. */
header.signature = -1;
header.type_cu_offset_in_tu = (cu_offset) -1;
/* We need to read the type's signature in order to build the hash
table, but we don't need anything else just yet. */
ptr = read_and_check_comp_unit_head (per_objfile, &header, section,
abbrev_section, ptr, section_kind);
length = header.get_length ();
/* Skip dummy type units. */
if (ptr >= info_ptr + length
|| peek_abbrev_code (abfd, ptr) == 0
|| (header.unit_type != DW_UT_type
&& header.unit_type != DW_UT_split_type))
{
info_ptr += length;
continue;
}
if (types_htab == NULL)
types_htab = allocate_dwo_unit_table ();
dwo_tu = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, dwo_unit);
dwo_tu->dwo_file = dwo_file;
dwo_tu->signature = header.signature;
dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
dwo_tu->section = section;
dwo_tu->sect_off = sect_off;
dwo_tu->length = length;
slot = htab_find_slot (types_htab.get (), dwo_tu, INSERT);
gdb_assert (slot != NULL);
if (*slot != NULL)
complaint (_("debug type entry at offset %s is duplicate to"
" the entry at offset %s, signature %s"),
sect_offset_str (sect_off),
sect_offset_str (dwo_tu->sect_off),
hex_string (header.signature));
*slot = dwo_tu;
dwarf_read_debug_printf_v (" offset %s, signature %s",
sect_offset_str (sect_off),
hex_string (header.signature));
info_ptr += length;
}
}
/* Create the hash table of all entries in the .debug_types
(or .debug_types.dwo) section(s).
DWO_FILE is a pointer to the DWO file object.
The result is a pointer to the hash table or NULL if there are no types.
Note: This function processes DWO files only, not DWP files. */
static void
create_debug_types_hash_table (dwarf2_per_objfile *per_objfile,
struct dwo_file *dwo_file,
gdb::array_view<dwarf2_section_info> type_sections,
htab_up &types_htab)
{
for (dwarf2_section_info &section : type_sections)
create_debug_type_hash_table (per_objfile, dwo_file, &section, types_htab,
rcuh_kind::TYPE);
}
/* Add an entry for signature SIG to dwarf2_per_objfile->per_bfd->signatured_types.
If SLOT is non-NULL, it is the entry to use in the hash table.
Otherwise we find one. */
static struct signatured_type *
add_type_unit (dwarf2_per_objfile *per_objfile, ULONGEST sig, void **slot)
{
if (per_objfile->per_bfd->all_comp_units.size ()
== per_objfile->per_bfd->all_comp_units.capacity ())
++per_objfile->per_bfd->tu_stats.nr_all_type_units_reallocs;
signatured_type_up sig_type_holder
= per_objfile->per_bfd->allocate_signatured_type (sig);
signatured_type *sig_type = sig_type_holder.get ();
per_objfile->per_bfd->all_comp_units.emplace_back
(sig_type_holder.release ());
if (per_objfile->per_bfd->using_index)
{
sig_type->v.quick =
OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack,
struct dwarf2_per_cu_quick_data);
}
if (slot == NULL)
{
slot = htab_find_slot (per_objfile->per_bfd->signatured_types.get (),
sig_type, INSERT);
}
gdb_assert (*slot == NULL);
*slot = sig_type;
/* The rest of sig_type must be filled in by the caller. */
return sig_type;
}
/* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
Fill in SIG_ENTRY with DWO_ENTRY. */
static void
fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile *per_objfile,
struct signatured_type *sig_entry,
struct dwo_unit *dwo_entry)
{
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
/* Make sure we're not clobbering something we don't expect to. */
gdb_assert (! sig_entry->queued);
gdb_assert (per_objfile->get_cu (sig_entry) == NULL);
if (per_bfd->using_index)
{
gdb_assert (sig_entry->v.quick != NULL);
gdb_assert (!per_objfile->symtab_set_p (sig_entry));
}
else
gdb_assert (sig_entry->v.psymtab == NULL);
gdb_assert (sig_entry->signature == dwo_entry->signature);
gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
gdb_assert (sig_entry->type_unit_group == NULL);
gdb_assert (sig_entry->dwo_unit == NULL);
sig_entry->section = dwo_entry->section;
sig_entry->sect_off = dwo_entry->sect_off;
sig_entry->length = dwo_entry->length;
sig_entry->reading_dwo_directly = 1;
sig_entry->per_bfd = per_bfd;
sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
sig_entry->dwo_unit = dwo_entry;
}
/* Subroutine of lookup_signatured_type.
If we haven't read the TU yet, create the signatured_type data structure
for a TU to be read in directly from a DWO file, bypassing the stub.
This is the "Stay in DWO Optimization": When there is no DWP file and we're
using .gdb_index, then when reading a CU we want to stay in the DWO file
containing that CU. Otherwise we could end up reading several other DWO
files (due to comdat folding) to process the transitive closure of all the
mentioned TUs, and that can be slow. The current DWO file will have every
type signature that it needs.
We only do this for .gdb_index because in the psymtab case we already have
to read all the DWOs to build the type unit groups. */
static struct signatured_type *
lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct dwo_file *dwo_file;
struct dwo_unit find_dwo_entry, *dwo_entry;
void **slot;
gdb_assert (cu->dwo_unit && per_objfile->per_bfd->using_index);
/* If TU skeletons have been removed then we may not have read in any
TUs yet. */
if (per_objfile->per_bfd->signatured_types == NULL)
per_objfile->per_bfd->signatured_types = allocate_signatured_type_table ();
/* We only ever need to read in one copy of a signatured type.
Use the global signatured_types array to do our own comdat-folding
of types. If this is the first time we're reading this TU, and
the TU has an entry in .gdb_index, replace the recorded data from
.gdb_index with this TU. */
signatured_type find_sig_entry (sig);
slot = htab_find_slot (per_objfile->per_bfd->signatured_types.get (),
&find_sig_entry, INSERT);
signatured_type *sig_entry = (struct signatured_type *) *slot;
/* We can get here with the TU already read, *or* in the process of being
read. Don't reassign the global entry to point to this DWO if that's
the case. Also note that if the TU is already being read, it may not
have come from a DWO, the program may be a mix of Fission-compiled
code and non-Fission-compiled code. */
/* Have we already tried to read this TU?
Note: sig_entry can be NULL if the skeleton TU was removed (thus it
needn't exist in the global table yet). */
if (sig_entry != NULL && sig_entry->tu_read)
return sig_entry;
/* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
dwo_unit of the TU itself. */
dwo_file = cu->dwo_unit->dwo_file;
/* Ok, this is the first time we're reading this TU. */
if (dwo_file->tus == NULL)
return NULL;
find_dwo_entry.signature = sig;
dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus.get (),
&find_dwo_entry);
if (dwo_entry == NULL)
return NULL;
/* If the global table doesn't have an entry for this TU, add one. */
if (sig_entry == NULL)
sig_entry = add_type_unit (per_objfile, sig, slot);
fill_in_sig_entry_from_dwo_entry (per_objfile, sig_entry, dwo_entry);
sig_entry->tu_read = 1;
return sig_entry;
}
/* Subroutine of lookup_signatured_type.
Look up the type for signature SIG, and if we can't find SIG in .gdb_index
then try the DWP file. If the TU stub (skeleton) has been removed then
it won't be in .gdb_index. */
static struct signatured_type *
lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct dwp_file *dwp_file = get_dwp_file (per_objfile);
struct dwo_unit *dwo_entry;
void **slot;
gdb_assert (cu->dwo_unit && per_objfile->per_bfd->using_index);
gdb_assert (dwp_file != NULL);
/* If TU skeletons have been removed then we may not have read in any
TUs yet. */
if (per_objfile->per_bfd->signatured_types == NULL)
per_objfile->per_bfd->signatured_types = allocate_signatured_type_table ();
signatured_type find_sig_entry (sig);
slot = htab_find_slot (per_objfile->per_bfd->signatured_types.get (),
&find_sig_entry, INSERT);
signatured_type *sig_entry = (struct signatured_type *) *slot;
/* Have we already tried to read this TU?
Note: sig_entry can be NULL if the skeleton TU was removed (thus it
needn't exist in the global table yet). */
if (sig_entry != NULL)
return sig_entry;
if (dwp_file->tus == NULL)
return NULL;
dwo_entry = lookup_dwo_unit_in_dwp (per_objfile, dwp_file, NULL, sig,
1 /* is_debug_types */);
if (dwo_entry == NULL)
return NULL;
sig_entry = add_type_unit (per_objfile, sig, slot);
fill_in_sig_entry_from_dwo_entry (per_objfile, sig_entry, dwo_entry);
return sig_entry;
}
/* Lookup a signature based type for DW_FORM_ref_sig8.
Returns NULL if signature SIG is not present in the table.
It is up to the caller to complain about this. */
static struct signatured_type *
lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
if (cu->dwo_unit && per_objfile->per_bfd->using_index)
{
/* We're in a DWO/DWP file, and we're using .gdb_index.
These cases require special processing. */
if (get_dwp_file (per_objfile) == NULL)
return lookup_dwo_signatured_type (cu, sig);
else
return lookup_dwp_signatured_type (cu, sig);
}
else
{
if (per_objfile->per_bfd->signatured_types == NULL)
return NULL;
signatured_type find_entry (sig);
return ((struct signatured_type *)
htab_find (per_objfile->per_bfd->signatured_types.get (),
&find_entry));
}
}
/* Low level DIE reading support. */
/* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
static void
init_cu_die_reader (struct die_reader_specs *reader,
struct dwarf2_cu *cu,
struct dwarf2_section_info *section,
struct dwo_file *dwo_file,
struct abbrev_table *abbrev_table)
{
gdb_assert (section->readin && section->buffer != NULL);
reader->abfd = section->get_bfd_owner ();
reader->cu = cu;
reader->dwo_file = dwo_file;
reader->die_section = section;
reader->buffer = section->buffer;
reader->buffer_end = section->buffer + section->size;
reader->abbrev_table = abbrev_table;
}
/* Subroutine of cutu_reader to simplify it.
Read in the rest of a CU/TU top level DIE from DWO_UNIT.
There's just a lot of work to do, and cutu_reader is big enough
already.
STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
from it to the DIE in the DWO. If NULL we are skipping the stub.
STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
STUB_COMP_DIR may be non-NULL.
*RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE
are filled in with the info of the DIE from the DWO file.
*RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
from the dwo. Since *RESULT_READER references this abbrev table, it must be
kept around for at least as long as *RESULT_READER.
The result is non-zero if a valid (non-dummy) DIE was found. */
static int
read_cutu_die_from_dwo (dwarf2_cu *cu,
struct dwo_unit *dwo_unit,
struct die_info *stub_comp_unit_die,
const char *stub_comp_dir,
struct die_reader_specs *result_reader,
const gdb_byte **result_info_ptr,
struct die_info **result_comp_unit_die,
abbrev_table_up *result_dwo_abbrev_table)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
dwarf2_per_cu_data *per_cu = cu->per_cu;
struct objfile *objfile = per_objfile->objfile;
bfd *abfd;
const gdb_byte *begin_info_ptr, *info_ptr;
struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
int i,num_extra_attrs;
struct dwarf2_section_info *dwo_abbrev_section;
struct die_info *comp_unit_die;
/* At most one of these may be provided. */
gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
/* These attributes aren't processed until later:
DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
DW_AT_comp_dir is used now, to find the DWO file, but it is also
referenced later. However, these attributes are found in the stub
which we won't have later. In order to not impose this complication
on the rest of the code, we read them here and copy them to the
DWO CU/TU die. */
stmt_list = NULL;
low_pc = NULL;
high_pc = NULL;
ranges = NULL;
comp_dir = NULL;
if (stub_comp_unit_die != NULL)
{
/* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
DWO file. */
if (!per_cu->is_debug_types)
stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
cu->addr_base = stub_comp_unit_die->addr_base ();
/* There should be a DW_AT_GNU_ranges_base attribute here (if needed).
We need the value before we can process DW_AT_ranges values from the
DWO. */
cu->gnu_ranges_base = stub_comp_unit_die->gnu_ranges_base ();
/* For DWARF5: record the DW_AT_rnglists_base value from the skeleton. If
there are attributes of form DW_FORM_rnglistx in the skeleton, they'll
need the rnglists base. Attributes of form DW_FORM_rnglistx in the
split unit don't use it, as the DWO has its own .debug_rnglists.dwo
section. */
cu->rnglists_base = stub_comp_unit_die->rnglists_base ();
}
else if (stub_comp_dir != NULL)
{
/* Reconstruct the comp_dir attribute to simplify the code below. */
comp_dir = OBSTACK_ZALLOC (&cu->comp_unit_obstack, struct attribute);
comp_dir->name = DW_AT_comp_dir;
comp_dir->form = DW_FORM_string;
comp_dir->set_string_noncanonical (stub_comp_dir);
}
/* Set up for reading the DWO CU/TU. */
cu->dwo_unit = dwo_unit;
dwarf2_section_info *section = dwo_unit->section;
section->read (objfile);
abfd = section->get_bfd_owner ();
begin_info_ptr = info_ptr = (section->buffer
+ to_underlying (dwo_unit->sect_off));
dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
if (per_cu->is_debug_types)
{
signatured_type *sig_type = (struct signatured_type *) per_cu;
info_ptr = read_and_check_comp_unit_head (per_objfile, &cu->header,
section, dwo_abbrev_section,
info_ptr, rcuh_kind::TYPE);
/* This is not an assert because it can be caused by bad debug info. */
if (sig_type->signature != cu->header.signature)
{
error (_("Dwarf Error: signature mismatch %s vs %s while reading"
" TU at offset %s [in module %s]"),
hex_string (sig_type->signature),
hex_string (cu->header.signature),
sect_offset_str (dwo_unit->sect_off),
bfd_get_filename (abfd));
}
gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
/* For DWOs coming from DWP files, we don't know the CU length
nor the type's offset in the TU until now. */
dwo_unit->length = cu->header.get_length ();
dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
/* Establish the type offset that can be used to lookup the type.
For DWO files, we don't know it until now. */
sig_type->type_offset_in_section
= dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
}
else
{
info_ptr = read_and_check_comp_unit_head (per_objfile, &cu->header,
section, dwo_abbrev_section,
info_ptr, rcuh_kind::COMPILE);
gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
/* For DWOs coming from DWP files, we don't know the CU length
until now. */
dwo_unit->length = cu->header.get_length ();
}
dwo_abbrev_section->read (objfile);
*result_dwo_abbrev_table
= abbrev_table::read (dwo_abbrev_section, cu->header.abbrev_sect_off);
init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
result_dwo_abbrev_table->get ());
/* Read in the die, but leave space to copy over the attributes
from the stub. This has the benefit of simplifying the rest of
the code - all the work to maintain the illusion of a single
DW_TAG_{compile,type}_unit DIE is done here. */
num_extra_attrs = ((stmt_list != NULL)
+ (low_pc != NULL)
+ (high_pc != NULL)
+ (ranges != NULL)
+ (comp_dir != NULL));
info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
num_extra_attrs);
/* Copy over the attributes from the stub to the DIE we just read in. */
comp_unit_die = *result_comp_unit_die;
i = comp_unit_die->num_attrs;
if (stmt_list != NULL)
comp_unit_die->attrs[i++] = *stmt_list;
if (low_pc != NULL)
comp_unit_die->attrs[i++] = *low_pc;
if (high_pc != NULL)
comp_unit_die->attrs[i++] = *high_pc;
if (ranges != NULL)
comp_unit_die->attrs[i++] = *ranges;
if (comp_dir != NULL)
comp_unit_die->attrs[i++] = *comp_dir;
comp_unit_die->num_attrs += num_extra_attrs;
if (dwarf_die_debug)
{
fprintf_unfiltered (gdb_stdlog,
"Read die from %s@0x%x of %s:\n",
section->get_name (),
(unsigned) (begin_info_ptr - section->buffer),
bfd_get_filename (abfd));
dump_die (comp_unit_die, dwarf_die_debug);
}
/* Skip dummy compilation units. */
if (info_ptr >= begin_info_ptr + dwo_unit->length
|| peek_abbrev_code (abfd, info_ptr) == 0)
return 0;
*result_info_ptr = info_ptr;
return 1;
}
/* Return the signature of the compile unit, if found. In DWARF 4 and before,
the signature is in the DW_AT_GNU_dwo_id attribute. In DWARF 5 and later, the
signature is part of the header. */
static gdb::optional<ULONGEST>
lookup_dwo_id (struct dwarf2_cu *cu, struct die_info* comp_unit_die)
{
if (cu->header.version >= 5)
return cu->header.signature;
struct attribute *attr;
attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
if (attr == nullptr || !attr->form_is_unsigned ())
return gdb::optional<ULONGEST> ();
return attr->as_unsigned ();
}
/* Subroutine of cutu_reader to simplify it.
Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
Returns NULL if the specified DWO unit cannot be found. */
static struct dwo_unit *
lookup_dwo_unit (dwarf2_cu *cu, die_info *comp_unit_die, const char *dwo_name)
{
dwarf2_per_cu_data *per_cu = cu->per_cu;
struct dwo_unit *dwo_unit;
const char *comp_dir;
gdb_assert (cu != NULL);
/* Yeah, we look dwo_name up again, but it simplifies the code. */
dwo_name = dwarf2_dwo_name (comp_unit_die, cu);
comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
if (per_cu->is_debug_types)
dwo_unit = lookup_dwo_type_unit (cu, dwo_name, comp_dir);
else
{
gdb::optional<ULONGEST> signature = lookup_dwo_id (cu, comp_unit_die);
if (!signature.has_value ())
error (_("Dwarf Error: missing dwo_id for dwo_name %s"
" [in module %s]"),
dwo_name, bfd_get_filename (per_cu->per_bfd->obfd));
dwo_unit = lookup_dwo_comp_unit (cu, dwo_name, comp_dir, *signature);
}
return dwo_unit;
}
/* Subroutine of cutu_reader to simplify it.
See it for a description of the parameters.
Read a TU directly from a DWO file, bypassing the stub. */
void
cutu_reader::init_tu_and_read_dwo_dies (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
dwarf2_cu *existing_cu)
{
struct signatured_type *sig_type;
/* Verify we can do the following downcast, and that we have the
data we need. */
gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
sig_type = (struct signatured_type *) this_cu;
gdb_assert (sig_type->dwo_unit != NULL);
dwarf2_cu *cu;
if (existing_cu != nullptr)
{
cu = existing_cu;
gdb_assert (cu->dwo_unit == sig_type->dwo_unit);
/* There's no need to do the rereading_dwo_cu handling that
cutu_reader does since we don't read the stub. */
}
else
{
/* If an existing_cu is provided, a dwarf2_cu must not exist for this_cu
in per_objfile yet. */
gdb_assert (per_objfile->get_cu (this_cu) == nullptr);
m_new_cu.reset (new dwarf2_cu (this_cu, per_objfile));
cu = m_new_cu.get ();
}
/* A future optimization, if needed, would be to use an existing
abbrev table. When reading DWOs with skeletonless TUs, all the TUs
could share abbrev tables. */
if (read_cutu_die_from_dwo (cu, sig_type->dwo_unit,
NULL /* stub_comp_unit_die */,
sig_type->dwo_unit->dwo_file->comp_dir,
this, &info_ptr,
&comp_unit_die,
&m_dwo_abbrev_table) == 0)
{
/* Dummy die. */
dummy_p = true;
}
}
/* Initialize a CU (or TU) and read its DIEs.
If the CU defers to a DWO file, read the DWO file as well.
ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
Otherwise the table specified in the comp unit header is read in and used.
This is an optimization for when we already have the abbrev table.
If EXISTING_CU is non-NULL, then use it. Otherwise, a new CU is
allocated. */
cutu_reader::cutu_reader (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
struct abbrev_table *abbrev_table,
dwarf2_cu *existing_cu,
bool skip_partial)
: die_reader_specs {},
m_this_cu (this_cu)
{
struct objfile *objfile = per_objfile->objfile;
struct dwarf2_section_info *section = this_cu->section;
bfd *abfd = section->get_bfd_owner ();
const gdb_byte *begin_info_ptr;
struct signatured_type *sig_type = NULL;
struct dwarf2_section_info *abbrev_section;
/* Non-zero if CU currently points to a DWO file and we need to
reread it. When this happens we need to reread the skeleton die
before we can reread the DWO file (this only applies to CUs, not TUs). */
int rereading_dwo_cu = 0;
if (dwarf_die_debug)
fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
this_cu->is_debug_types ? "type" : "comp",
sect_offset_str (this_cu->sect_off));
/* If we're reading a TU directly from a DWO file, including a virtual DWO
file (instead of going through the stub), short-circuit all of this. */
if (this_cu->reading_dwo_directly)
{
/* Narrow down the scope of possibilities to have to understand. */
gdb_assert (this_cu->is_debug_types);
gdb_assert (abbrev_table == NULL);
init_tu_and_read_dwo_dies (this_cu, per_objfile, existing_cu);
return;
}
/* This is cheap if the section is already read in. */
section->read (objfile);
begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
abbrev_section = get_abbrev_section_for_cu (this_cu);
dwarf2_cu *cu;
if (existing_cu != nullptr)
{
cu = existing_cu;
/* If this CU is from a DWO file we need to start over, we need to
refetch the attributes from the skeleton CU.
This could be optimized by retrieving those attributes from when we
were here the first time: the previous comp_unit_die was stored in
comp_unit_obstack. But there's no data yet that we need this
optimization. */
if (cu->dwo_unit != NULL)
rereading_dwo_cu = 1;
}
else
{
/* If an existing_cu is provided, a dwarf2_cu must not exist for this_cu
in per_objfile yet. */
gdb_assert (per_objfile->get_cu (this_cu) == nullptr);
m_new_cu.reset (new dwarf2_cu (this_cu, per_objfile));
cu = m_new_cu.get ();
}
/* Get the header. */
if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
{
/* We already have the header, there's no need to read it in again. */
info_ptr += to_underlying (cu->header.first_die_cu_offset);
}
else
{
if (this_cu->is_debug_types)
{
info_ptr = read_and_check_comp_unit_head (per_objfile, &cu->header,
section, abbrev_section,
info_ptr, rcuh_kind::TYPE);
/* Since per_cu is the first member of struct signatured_type,
we can go from a pointer to one to a pointer to the other. */
sig_type = (struct signatured_type *) this_cu;
gdb_assert (sig_type->signature == cu->header.signature);
gdb_assert (sig_type->type_offset_in_tu
== cu->header.type_cu_offset_in_tu);
gdb_assert (this_cu->sect_off == cu->header.sect_off);
/* LENGTH has not been set yet for type units if we're
using .gdb_index. */
this_cu->length = cu->header.get_length ();
/* Establish the type offset that can be used to lookup the type. */
sig_type->type_offset_in_section =
this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
this_cu->dwarf_version = cu->header.version;
}
else
{
info_ptr = read_and_check_comp_unit_head (per_objfile, &cu->header,
section, abbrev_section,
info_ptr,
rcuh_kind::COMPILE);
gdb_assert (this_cu->sect_off == cu->header.sect_off);
if (this_cu->length == 0)
this_cu->length = cu->header.get_length ();
else
gdb_assert (this_cu->length == cu->header.get_length ());
this_cu->dwarf_version = cu->header.version;
}
}
/* Skip dummy compilation units. */
if (info_ptr >= begin_info_ptr + this_cu->length
|| peek_abbrev_code (abfd, info_ptr) == 0)
{
dummy_p = true;
return;
}
/* If we don't have them yet, read the abbrevs for this compilation unit.
And if we need to read them now, make sure they're freed when we're
done. */
if (abbrev_table != NULL)
gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
else
{
abbrev_section->read (objfile);
m_abbrev_table_holder
= abbrev_table::read (abbrev_section, cu->header.abbrev_sect_off);
abbrev_table = m_abbrev_table_holder.get ();
}
/* Read the top level CU/TU die. */
init_cu_die_reader (this, cu, section, NULL, abbrev_table);
info_ptr = read_full_die (this, &comp_unit_die, info_ptr);
if (skip_partial && comp_unit_die->tag == DW_TAG_partial_unit)
{
dummy_p = true;
return;
}
/* If we are in a DWO stub, process it and then read in the "real" CU/TU
from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
table from the DWO file and pass the ownership over to us. It will be
referenced from READER, so we must make sure to free it after we're done
with READER.
Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
DWO CU, that this test will fail (the attribute will not be present). */
const char *dwo_name = dwarf2_dwo_name (comp_unit_die, cu);
if (dwo_name != nullptr)
{
struct dwo_unit *dwo_unit;
struct die_info *dwo_comp_unit_die;
if (comp_unit_die->has_children)
{
complaint (_("compilation unit with DW_AT_GNU_dwo_name"
" has children (offset %s) [in module %s]"),
sect_offset_str (this_cu->sect_off),
bfd_get_filename (abfd));
}
dwo_unit = lookup_dwo_unit (cu, comp_unit_die, dwo_name);
if (dwo_unit != NULL)
{
if (read_cutu_die_from_dwo (cu, dwo_unit,
comp_unit_die, NULL,
this, &info_ptr,
&dwo_comp_unit_die,
&m_dwo_abbrev_table) == 0)
{
/* Dummy die. */
dummy_p = true;
return;
}
comp_unit_die = dwo_comp_unit_die;
}
else
{
/* Yikes, we couldn't find the rest of the DIE, we only have
the stub. A complaint has already been logged. There's
not much more we can do except pass on the stub DIE to
die_reader_func. We don't want to throw an error on bad
debug info. */
}
}
}
void
cutu_reader::keep ()
{
/* Done, clean up. */
gdb_assert (!dummy_p);
if (m_new_cu != NULL)
{
/* Save this dwarf2_cu in the per_objfile. The per_objfile owns it
now. */
dwarf2_per_objfile *per_objfile = m_new_cu->per_objfile;
per_objfile->set_cu (m_this_cu, m_new_cu.release ());
}
}
/* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name (DW_AT_dwo_name)
if present. DWO_FILE, if non-NULL, is the DWO file to read (the caller is
assumed to have already done the lookup to find the DWO file).
The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
THIS_CU->is_debug_types, but nothing else.
We fill in THIS_CU->length.
THIS_CU->cu is always freed when done.
This is done in order to not leave THIS_CU->cu in a state where we have
to care whether it refers to the "main" CU or the DWO CU.
When parent_cu is passed, it is used to provide a default value for
str_offsets_base and addr_base from the parent. */
cutu_reader::cutu_reader (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
struct dwarf2_cu *parent_cu,
struct dwo_file *dwo_file)
: die_reader_specs {},
m_this_cu (this_cu)
{
struct objfile *objfile = per_objfile->objfile;
struct dwarf2_section_info *section = this_cu->section;
bfd *abfd = section->get_bfd_owner ();
struct dwarf2_section_info *abbrev_section;
const gdb_byte *begin_info_ptr, *info_ptr;
if (dwarf_die_debug)
fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
this_cu->is_debug_types ? "type" : "comp",
sect_offset_str (this_cu->sect_off));
gdb_assert (per_objfile->get_cu (this_cu) == nullptr);
abbrev_section = (dwo_file != NULL
? &dwo_file->sections.abbrev
: get_abbrev_section_for_cu (this_cu));
/* This is cheap if the section is already read in. */
section->read (objfile);
m_new_cu.reset (new dwarf2_cu (this_cu, per_objfile));
begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
info_ptr = read_and_check_comp_unit_head (per_objfile, &m_new_cu->header,
section, abbrev_section, info_ptr,
(this_cu->is_debug_types
? rcuh_kind::TYPE
: rcuh_kind::COMPILE));
if (parent_cu != nullptr)
{
m_new_cu->str_offsets_base = parent_cu->str_offsets_base;
m_new_cu->addr_base = parent_cu->addr_base;
}
this_cu->length = m_new_cu->header.get_length ();
/* Skip dummy compilation units. */
if (info_ptr >= begin_info_ptr + this_cu->length
|| peek_abbrev_code (abfd, info_ptr) == 0)
{
dummy_p = true;
return;
}
abbrev_section->read (objfile);
m_abbrev_table_holder
= abbrev_table::read (abbrev_section, m_new_cu->header.abbrev_sect_off);
init_cu_die_reader (this, m_new_cu.get (), section, dwo_file,
m_abbrev_table_holder.get ());
info_ptr = read_full_die (this, &comp_unit_die, info_ptr);
}
/* Type Unit Groups.
Type Unit Groups are a way to collapse the set of all TUs (type units) into
a more manageable set. The grouping is done by DW_AT_stmt_list entry
so that all types coming from the same compilation (.o file) are grouped
together. A future step could be to put the types in the same symtab as
the CU the types ultimately came from. */
static hashval_t
hash_type_unit_group (const void *item)
{
const struct type_unit_group *tu_group
= (const struct type_unit_group *) item;
return hash_stmt_list_entry (&tu_group->hash);
}
static int
eq_type_unit_group (const void *item_lhs, const void *item_rhs)
{
const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
}
/* Allocate a hash table for type unit groups. */
static htab_up
allocate_type_unit_groups_table ()
{
return htab_up (htab_create_alloc (3,
hash_type_unit_group,
eq_type_unit_group,
htab_delete_entry<type_unit_group>,
xcalloc, xfree));
}
/* Type units that don't have DW_AT_stmt_list are grouped into their own
partial symtabs. We combine several TUs per psymtab to not let the size
of any one psymtab grow too big. */
#define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
#define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
/* Helper routine for get_type_unit_group.
Create the type_unit_group object used to hold one or more TUs. */
static std::unique_ptr<type_unit_group>
create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
std::unique_ptr<type_unit_group> tu_group (new type_unit_group);
tu_group->per_bfd = per_bfd;
if (per_bfd->using_index)
{
tu_group->v.quick = OBSTACK_ZALLOC (&per_bfd->obstack,
struct dwarf2_per_cu_quick_data);
}
else
{
unsigned int line_offset = to_underlying (line_offset_struct);
dwarf2_psymtab *pst;
std::string name;
/* Give the symtab a useful name for debug purposes. */
if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
name = string_printf ("<type_units_%d>",
(line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
else
name = string_printf ("<type_units_at_0x%x>", line_offset);
pst = create_partial_symtab (tu_group.get (), per_objfile,
name.c_str ());
pst->anonymous = true;
}
tu_group->hash.dwo_unit = cu->dwo_unit;
tu_group->hash.line_sect_off = line_offset_struct;
return tu_group;
}
/* Look up the type_unit_group for type unit CU, and create it if necessary.
STMT_LIST is a DW_AT_stmt_list attribute. */
static struct type_unit_group *
get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct tu_stats *tu_stats = &per_objfile->per_bfd->tu_stats;
struct type_unit_group *tu_group;
void **slot;
unsigned int line_offset;
struct type_unit_group type_unit_group_for_lookup;
if (per_objfile->per_bfd->type_unit_groups == NULL)
per_objfile->per_bfd->type_unit_groups = allocate_type_unit_groups_table ();
/* Do we need to create a new group, or can we use an existing one? */
if (stmt_list != nullptr && stmt_list->form_is_unsigned ())
{
line_offset = stmt_list->as_unsigned ();
++tu_stats->nr_symtab_sharers;
}
else
{
/* Ugh, no stmt_list. Rare, but we have to handle it.
We can do various things here like create one group per TU or
spread them over multiple groups to split up the expansion work.
To avoid worst case scenarios (too many groups or too large groups)
we, umm, group them in bunches. */
line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
| (tu_stats->nr_stmt_less_type_units
/ NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
++tu_stats->nr_stmt_less_type_units;
}
type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
slot = htab_find_slot (per_objfile->per_bfd->type_unit_groups.get (),
&type_unit_group_for_lookup, INSERT);
if (*slot == nullptr)
{
sect_offset line_offset_struct = (sect_offset) line_offset;
std::unique_ptr<type_unit_group> grp
= create_type_unit_group (cu, line_offset_struct);
*slot = grp.release ();
++tu_stats->nr_symtabs;
}
tu_group = (struct type_unit_group *) *slot;
gdb_assert (tu_group != nullptr);
return tu_group;
}
/* Partial symbol tables. */
/* Create a psymtab named NAME and assign it to PER_CU.
The caller must fill in the following details:
dirname, textlow, texthigh. */
static dwarf2_psymtab *
create_partial_symtab (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
const char *name)
{
dwarf2_psymtab *pst
= new dwarf2_psymtab (name, per_objfile->per_bfd->partial_symtabs.get (),
per_objfile->objfile->per_bfd, per_cu);
pst->psymtabs_addrmap_supported = true;
/* This is the glue that links PST into GDB's symbol API. */
per_cu->v.psymtab = pst;
return pst;
}
/* DIE reader function for process_psymtab_comp_unit. */
static void
process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
const gdb_byte *info_ptr,
struct die_info *comp_unit_die,
enum language pretend_language)
{
struct dwarf2_cu *cu = reader->cu;
dwarf2_per_objfile *per_objfile = cu->per_objfile;
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
struct objfile *objfile = per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
struct dwarf2_per_cu_data *per_cu = cu->per_cu;
CORE_ADDR baseaddr;
CORE_ADDR best_lowpc = 0, best_highpc = 0;
dwarf2_psymtab *pst;
enum pc_bounds_kind cu_bounds_kind;
gdb_assert (! per_cu->is_debug_types);
prepare_one_comp_unit (cu, comp_unit_die, pretend_language);
/* Allocate a new partial symbol table structure. */
gdb::unique_xmalloc_ptr<char> debug_filename;
static const char artificial[] = "<artificial>";
file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
if (strcmp (fnd.name, artificial) == 0)
{
debug_filename.reset (concat (artificial, "@",
sect_offset_str (per_cu->sect_off),
(char *) NULL));
fnd.name = debug_filename.get ();
}
pst = create_partial_symtab (per_cu, per_objfile, fnd.name);
/* This must be done before calling dwarf2_build_include_psymtabs. */
pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
baseaddr = objfile->text_section_offset ();
dwarf2_find_base_address (comp_unit_die, cu);
/* Possibly set the default values of LOWPC and HIGHPC from
`DW_AT_ranges'. */
cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
&best_highpc, cu, pst);
if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
{
CORE_ADDR low
= (gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr)
- baseaddr);
CORE_ADDR high
= (gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr)
- baseaddr - 1);
/* Store the contiguous range if it is not empty; it can be
empty for CUs with no code. */
addrmap_set_empty (per_bfd->partial_symtabs->psymtabs_addrmap,
low, high, pst);
}
/* Check if comp unit has_children.
If so, read the rest of the partial symbols from this comp unit.
If not, there's no more debug_info for this comp unit. */
if (comp_unit_die->has_children)
{
struct partial_die_info *first_die;
CORE_ADDR lowpc, highpc;
lowpc = ((CORE_ADDR) -1);
highpc = ((CORE_ADDR) 0);
first_die = load_partial_dies (reader, info_ptr, 1);
scan_partial_symbols (first_die, &lowpc, &highpc,
cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
/* If we didn't find a lowpc, set it to highpc to avoid
complaints from `maint check'. */
if (lowpc == ((CORE_ADDR) -1))
lowpc = highpc;
/* If the compilation unit didn't have an explicit address range,
then use the information extracted from its child dies. */
if (cu_bounds_kind <= PC_BOUNDS_INVALID)
{
best_lowpc = lowpc;
best_highpc = highpc;
}
}
pst->set_text_low (gdbarch_adjust_dwarf2_addr (gdbarch,
best_lowpc + baseaddr)
- baseaddr);
pst->set_text_high (gdbarch_adjust_dwarf2_addr (gdbarch,
best_highpc + baseaddr)
- baseaddr);
pst->end ();
if (!cu->per_cu->imported_symtabs_empty ())
{
int i;
int len = cu->per_cu->imported_symtabs_size ();
/* Fill in 'dependencies' here; we fill in 'users' in a
post-pass. */
pst->number_of_dependencies = len;
pst->dependencies
= per_bfd->partial_symtabs->allocate_dependencies (len);
for (i = 0; i < len; ++i)
{
pst->dependencies[i]
= cu->per_cu->imported_symtabs->at (i)->v.psymtab;
}
cu->per_cu->imported_symtabs_free ();
}
/* Get the list of files included in the current compilation unit,
and build a psymtab for each of them. */
dwarf2_build_include_psymtabs (cu, comp_unit_die, fnd, pst);
dwarf_read_debug_printf ("Psymtab for %s unit @%s: %s - %s"
", %d global, %d static syms",
per_cu->is_debug_types ? "type" : "comp",
sect_offset_str (per_cu->sect_off),
paddress (gdbarch, pst->text_low (objfile)),
paddress (gdbarch, pst->text_high (objfile)),
(int) pst->global_psymbols.size (),
(int) pst->static_psymbols.size ());
}
/* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
Process compilation unit THIS_CU for a psymtab. */
static void
process_psymtab_comp_unit (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
bool want_partial_unit,
enum language pretend_language)
{
/* If this compilation unit was already read in, free the
cached copy in order to read it in again. This is
necessary because we skipped some symbols when we first
read in the compilation unit (see load_partial_dies).
This problem could be avoided, but the benefit is unclear. */
per_objfile->remove_cu (this_cu);
cutu_reader reader (this_cu, per_objfile, nullptr, nullptr, false);
if (reader.comp_unit_die == nullptr)
return;
switch (reader.comp_unit_die->tag)
{
case DW_TAG_compile_unit:
this_cu->unit_type = DW_UT_compile;
break;
case DW_TAG_partial_unit:
this_cu->unit_type = DW_UT_partial;
break;
case DW_TAG_type_unit:
this_cu->unit_type = DW_UT_type;
break;
default:
error (_("Dwarf Error: unexpected tag '%s' at offset %s [in module %s]"),
dwarf_tag_name (reader.comp_unit_die->tag),
sect_offset_str (reader.cu->per_cu->sect_off),
objfile_name (per_objfile->objfile));
}
if (reader.dummy_p)
{
/* Nothing. */
}
else if (this_cu->is_debug_types)
build_type_psymtabs_reader (&reader, reader.info_ptr,
reader.comp_unit_die);
else if (want_partial_unit
|| reader.comp_unit_die->tag != DW_TAG_partial_unit)
process_psymtab_comp_unit_reader (&reader, reader.info_ptr,
reader.comp_unit_die,
pretend_language);
/* Age out any secondary CUs. */
per_objfile->age_comp_units ();
}
/* Reader function for build_type_psymtabs. */
static void
build_type_psymtabs_reader (const struct die_reader_specs *reader,
const gdb_byte *info_ptr,
struct die_info *type_unit_die)
{
dwarf2_per_objfile *per_objfile = reader->cu->per_objfile;
struct dwarf2_cu *cu = reader->cu;
struct dwarf2_per_cu_data *per_cu = cu->per_cu;
struct signatured_type *sig_type;
struct type_unit_group *tu_group;
struct attribute *attr;
struct partial_die_info *first_die;
CORE_ADDR lowpc, highpc;
dwarf2_psymtab *pst;
gdb_assert (per_cu->is_debug_types);
sig_type = (struct signatured_type *) per_cu;
if (! type_unit_die->has_children)
return;
attr = type_unit_die->attr (DW_AT_stmt_list);
tu_group = get_type_unit_group (cu, attr);
if (tu_group->tus == nullptr)
tu_group->tus = new std::vector<signatured_type *>;
tu_group->tus->push_back (sig_type);
prepare_one_comp_unit (cu, type_unit_die, language_minimal);
pst = create_partial_symtab (per_cu, per_objfile, "");
pst->anonymous = true;
first_die = load_partial_dies (reader, info_ptr, 1);
lowpc = (CORE_ADDR) -1;
highpc = (CORE_ADDR) 0;
scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
pst->end ();
}
/* Struct used to sort TUs by their abbreviation table offset. */
struct tu_abbrev_offset
{
tu_abbrev_offset (signatured_type *sig_type_, sect_offset abbrev_offset_)
: sig_type (sig_type_), abbrev_offset (abbrev_offset_)
{}
/* This is used when sorting. */
bool operator< (const tu_abbrev_offset &other) const
{
return abbrev_offset < other.abbrev_offset;
}
signatured_type *sig_type;
sect_offset abbrev_offset;
};
/* Efficiently read all the type units.
The efficiency is because we sort TUs by the abbrev table they use and
only read each abbrev table once. In one program there are 200K TUs
sharing 8K abbrev tables.
The main purpose of this function is to support building the
dwarf2_per_objfile->per_bfd->type_unit_groups table.
TUs typically share the DW_AT_stmt_list of the CU they came from, so we
can collapse the search space by grouping them by stmt_list.
The savings can be significant, in the same program from above the 200K TUs
share 8K stmt_list tables.
FUNC is expected to call get_type_unit_group, which will create the
struct type_unit_group if necessary and add it to
dwarf2_per_objfile->per_bfd->type_unit_groups. */
static void
build_type_psymtabs (dwarf2_per_objfile *per_objfile)
{
struct tu_stats *tu_stats = &per_objfile->per_bfd->tu_stats;
abbrev_table_up abbrev_table;
sect_offset abbrev_offset;
/* It's up to the caller to not call us multiple times. */
gdb_assert (per_objfile->per_bfd->type_unit_groups == NULL);
if (per_objfile->per_bfd->tu_stats.nr_tus == 0)
return;
/* TUs typically share abbrev tables, and there can be way more TUs than
abbrev tables. Sort by abbrev table to reduce the number of times we
read each abbrev table in.
Alternatives are to punt or to maintain a cache of abbrev tables.
This is simpler and efficient enough for now.
Later we group TUs by their DW_AT_stmt_list value (as this defines the
symtab to use). Typically TUs with the same abbrev offset have the same
stmt_list value too so in practice this should work well.
The basic algorithm here is:
sort TUs by abbrev table
for each TU with same abbrev table:
read abbrev table if first user
read TU top level DIE
[IWBN if DWO skeletons had DW_AT_stmt_list]
call FUNC */
dwarf_read_debug_printf ("Building type unit groups ...");
/* Sort in a separate table to maintain the order of all_comp_units
for .gdb_index: TU indices directly index all_type_units. */
std::vector<tu_abbrev_offset> sorted_by_abbrev;
sorted_by_abbrev.reserve (per_objfile->per_bfd->tu_stats.nr_tus);
for (const auto &cu : per_objfile->per_bfd->all_comp_units)
{
if (cu->is_debug_types)
{
auto sig_type = static_cast<signatured_type *> (cu.get ());
sorted_by_abbrev.emplace_back
(sig_type, read_abbrev_offset (per_objfile, sig_type->section,
sig_type->sect_off));
}
}
std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end ());
abbrev_offset = (sect_offset) ~(unsigned) 0;
for (const tu_abbrev_offset &tu : sorted_by_abbrev)
{
/* Switch to the next abbrev table if necessary. */
if (abbrev_table == NULL
|| tu.abbrev_offset != abbrev_offset)
{
abbrev_offset = tu.abbrev_offset;
per_objfile->per_bfd->abbrev.read (per_objfile->objfile);
abbrev_table =
abbrev_table::read (&per_objfile->per_bfd->abbrev, abbrev_offset);
++tu_stats->nr_uniq_abbrev_tables;
}
cutu_reader reader (tu.sig_type, per_objfile,
abbrev_table.get (), nullptr, false);
if (!reader.dummy_p)
build_type_psymtabs_reader (&reader, reader.info_ptr,
reader.comp_unit_die);
}
}
/* Print collected type unit statistics. */
static void
print_tu_stats (dwarf2_per_objfile *per_objfile)
{
struct tu_stats *tu_stats = &per_objfile->per_bfd->tu_stats;
dwarf_read_debug_printf ("Type unit statistics:");
dwarf_read_debug_printf (" %d TUs", tu_stats->nr_tus);
dwarf_read_debug_printf (" %d uniq abbrev tables",
tu_stats->nr_uniq_abbrev_tables);
dwarf_read_debug_printf (" %d symtabs from stmt_list entries",
tu_stats->nr_symtabs);
dwarf_read_debug_printf (" %d symtab sharers",
tu_stats->nr_symtab_sharers);
dwarf_read_debug_printf (" %d type units without a stmt_list",
tu_stats->nr_stmt_less_type_units);
dwarf_read_debug_printf (" %d all_type_units reallocs",
tu_stats->nr_all_type_units_reallocs);
}
/* Traversal function for build_type_psymtabs. */
static int
build_type_psymtab_dependencies (void **slot, void *info)
{
dwarf2_per_objfile *per_objfile = (dwarf2_per_objfile *) info;
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
dwarf2_psymtab *pst = tu_group->v.psymtab;
int len = (tu_group->tus == nullptr) ? 0 : tu_group->tus->size ();
int i;
gdb_assert (len > 0);
gdb_assert (tu_group->type_unit_group_p ());
pst->number_of_dependencies = len;
pst->dependencies = per_bfd->partial_symtabs->allocate_dependencies (len);
for (i = 0; i < len; ++i)
{
struct signatured_type *iter = tu_group->tus->at (i);
gdb_assert (iter->is_debug_types);
pst->dependencies[i] = iter->v.psymtab;
iter->type_unit_group = tu_group;
}
delete tu_group->tus;
tu_group->tus = nullptr;
return 1;
}
/* Traversal function for process_skeletonless_type_unit.
Read a TU in a DWO file and build partial symbols for it. */
static int
process_skeletonless_type_unit (void **slot, void *info)
{
struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
dwarf2_per_objfile *per_objfile = (dwarf2_per_objfile *) info;
/* If this TU doesn't exist in the global table, add it and read it in. */
if (per_objfile->per_bfd->signatured_types == NULL)
per_objfile->per_bfd->signatured_types = allocate_signatured_type_table ();
signatured_type find_entry (dwo_unit->signature);
slot = htab_find_slot (per_objfile->per_bfd->signatured_types.get (),
&find_entry, INSERT);
/* If we've already seen this type there's nothing to do. What's happening
is we're doing our own version of comdat-folding here. */
if (*slot != NULL)
return 1;
/* This does the job that create_all_comp_units would have done for
this TU. */
signatured_type *entry
= add_type_unit (per_objfile, dwo_unit->signature, slot);
fill_in_sig_entry_from_dwo_entry (per_objfile, entry, dwo_unit);
*slot = entry;
/* This does the job that build_type_psymtabs would have done. */
cutu_reader reader (entry, per_objfile, nullptr, nullptr, false);
if (!reader.dummy_p)
build_type_psymtabs_reader (&reader, reader.info_ptr,
reader.comp_unit_die);
return 1;
}
/* Traversal function for process_skeletonless_type_units. */
static int
process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
{
struct dwo_file *dwo_file = (struct dwo_file *) *slot;
if (dwo_file->tus != NULL)
htab_traverse_noresize (dwo_file->tus.get (),
process_skeletonless_type_unit, info);
return 1;
}
/* Scan all TUs of DWO files, verifying we've processed them.
This is needed in case a TU was emitted without its skeleton.
Note: This can't be done until we know what all the DWO files are. */
static void
process_skeletonless_type_units (dwarf2_per_objfile *per_objfile)
{
/* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
if (get_dwp_file (per_objfile) == NULL
&& per_objfile->per_bfd->dwo_files != NULL)
{
htab_traverse_noresize (per_objfile->per_bfd->dwo_files.get (),
process_dwo_file_for_skeletonless_type_units,
per_objfile);
}
}
/* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
static void
set_partial_user (dwarf2_per_objfile *per_objfile)
{
for (const auto &per_cu : per_objfile->per_bfd->all_comp_units)
{
dwarf2_psymtab *pst = per_cu->v.psymtab;
if (pst == NULL)
continue;
for (int j = 0; j < pst->number_of_dependencies; ++j)
{
/* Set the 'user' field only if it is not already set. */
if (pst->dependencies[j]->user == NULL)
pst->dependencies[j]->user = pst;
}
}
}
/* Build the partial symbol table by doing a quick pass through the
.debug_info and .debug_abbrev sections. */
static void
dwarf2_build_psymtabs_hard (dwarf2_per_objfile *per_objfile)
{
struct objfile *objfile = per_objfile->objfile;
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
dwarf_read_debug_printf ("Building psymtabs of objfile %s ...",
objfile_name (objfile));
scoped_restore restore_reading_psyms
= make_scoped_restore (&per_bfd->reading_partial_symbols, true);
per_bfd->info.read (objfile);
/* Any cached compilation units will be linked by the per-objfile
read_in_chain. Make sure to free them when we're done. */
free_cached_comp_units freer (per_objfile);
create_all_comp_units (per_objfile);
build_type_psymtabs (per_objfile);
/* Create a temporary address map on a temporary obstack. We later
copy this to the final obstack. */
auto_obstack temp_obstack;
scoped_restore save_psymtabs_addrmap
= make_scoped_restore (&per_bfd->partial_symtabs->psymtabs_addrmap,
addrmap_create_mutable (&temp_obstack));
for (const auto &per_cu : per_bfd->all_comp_units)
{
if (per_cu->v.psymtab != NULL)
/* In case a forward DW_TAG_imported_unit has read the CU already. */
continue;
process_psymtab_comp_unit (per_cu.get (), per_objfile, false,
language_minimal);
}
/* This has to wait until we read the CUs, we need the list of DWOs. */
process_skeletonless_type_units (per_objfile);
/* Now that all TUs have been processed we can fill in the dependencies. */
if (per_bfd->type_unit_groups != NULL)
{
htab_traverse_noresize (per_bfd->type_unit_groups.get (),
build_type_psymtab_dependencies, per_objfile);
}
if (dwarf_read_debug > 0)
print_tu_stats (per_objfile);
set_partial_user (per_objfile);
per_bfd->partial_symtabs->psymtabs_addrmap
= addrmap_create_fixed (per_bfd->partial_symtabs->psymtabs_addrmap,
per_bfd->partial_symtabs->obstack ());
/* At this point we want to keep the address map. */
save_psymtabs_addrmap.release ();
dwarf_read_debug_printf ("Done building psymtabs of %s",
objfile_name (objfile));
}
/* Load the partial DIEs for a secondary CU into memory.
This is also used when rereading a primary CU with load_all_dies. */
static void
load_partial_comp_unit (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
dwarf2_cu *existing_cu)
{
cutu_reader reader (this_cu, per_objfile, nullptr, existing_cu, false);
if (!reader.dummy_p)
{
prepare_one_comp_unit (reader.cu, reader.comp_unit_die,
language_minimal);
/* Check if comp unit has_children.
If so, read the rest of the partial symbols from this comp unit.
If not, there's no more debug_info for this comp unit. */
if (reader.comp_unit_die->has_children)
load_partial_dies (&reader, reader.info_ptr, 0);
reader.keep ();
}
}
static void
read_comp_units_from_section (dwarf2_per_objfile *per_objfile,
struct dwarf2_section_info *section,
struct dwarf2_section_info *abbrev_section,
unsigned int is_dwz,
htab_up &types_htab,
rcuh_kind section_kind)
{
const gdb_byte *info_ptr;
struct objfile *objfile = per_objfile->objfile;
dwarf_read_debug_printf ("Reading %s for %s",
section->get_name (),
section->get_file_name ());
section->read (objfile);
info_ptr = section->buffer;
while (info_ptr < section->buffer + section->size)
{
dwarf2_per_cu_data_up this_cu;
sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
comp_unit_head cu_header;
read_and_check_comp_unit_head (per_objfile, &cu_header, section,
abbrev_section, info_ptr,
section_kind);
/* Save the compilation unit for later lookup. */
if (cu_header.unit_type != DW_UT_type)
this_cu = per_objfile->per_bfd->allocate_per_cu ();
else
{
if (types_htab == nullptr)
types_htab = allocate_signatured_type_table ();
auto sig_type = per_objfile->per_bfd->allocate_signatured_type
(cu_header.signature);
signatured_type *sig_ptr = sig_type.get ();
sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
this_cu.reset (sig_type.release ());
void **slot = htab_find_slot (types_htab.get (), sig_ptr, INSERT);
gdb_assert (slot != nullptr);
if (*slot != nullptr)
complaint (_("debug type entry at offset %s is duplicate to"
" the entry at offset %s, signature %s"),
sect_offset_str (sect_off),
sect_offset_str (sig_ptr->sect_off),
hex_string (sig_ptr->signature));
*slot = sig_ptr;
}
this_cu->sect_off = sect_off;
this_cu->length = cu_header.length + cu_header.initial_length_size;
this_cu->is_dwz = is_dwz;
this_cu->section = section;
info_ptr = info_ptr + this_cu->length;
per_objfile->per_bfd->all_comp_units.push_back (std::move (this_cu));
}
}
/* Create a list of all compilation units in OBJFILE.
This is only done for -readnow and building partial symtabs. */
static void
create_all_comp_units (dwarf2_per_objfile *per_objfile)
{
htab_up types_htab;
read_comp_units_from_section (per_objfile, &per_objfile->per_bfd->info,
&per_objfile->per_bfd->abbrev, 0,
types_htab, rcuh_kind::COMPILE);
for (dwarf2_section_info &section : per_objfile->per_bfd->types)
read_comp_units_from_section (per_objfile, &section,
&per_objfile->per_bfd->abbrev, 0,
types_htab, rcuh_kind::TYPE);
dwz_file *dwz = dwarf2_get_dwz_file (per_objfile->per_bfd);
if (dwz != NULL)
read_comp_units_from_section (per_objfile, &dwz->info, &dwz->abbrev, 1,
types_htab, rcuh_kind::COMPILE);
per_objfile->per_bfd->signatured_types = std::move (types_htab);
}
/* Process all loaded DIEs for compilation unit CU, starting at
FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
DW_AT_ranges). See the comments of add_partial_subprogram on how
SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
static void
scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
CORE_ADDR *highpc, int set_addrmap,
struct dwarf2_cu *cu)
{
struct partial_die_info *pdi;
/* Now, march along the PDI's, descending into ones which have
interesting children but skipping the children of the other ones,
until we reach the end of the compilation unit. */
pdi = first_die;
while (pdi != NULL)
{
pdi->fixup (cu);
/* Anonymous namespaces or modules have no name but have interesting
children, so we need to look at them. Ditto for anonymous
enums. */
if (pdi->raw_name != NULL || pdi->tag == DW_TAG_namespace
|| pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
|| pdi->tag == DW_TAG_imported_unit
|| pdi->tag == DW_TAG_inlined_subroutine)
{
switch (pdi->tag)
{
case DW_TAG_subprogram:
case DW_TAG_inlined_subroutine:
add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
if (cu->per_cu->lang == language_cplus)
scan_partial_symbols (pdi->die_child, lowpc, highpc,
set_addrmap, cu);
break;
case DW_TAG_constant:
case DW_TAG_variable:
case DW_TAG_typedef:
case DW_TAG_union_type:
if (!pdi->is_declaration
|| (pdi->tag == DW_TAG_variable && pdi->is_external))
{
add_partial_symbol (pdi, cu);
}
break;
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
if (!pdi->is_declaration)
{
add_partial_symbol (pdi, cu);
}
if ((cu->per_cu->lang == language_rust
|| cu->per_cu->lang == language_cplus)
&& pdi->has_children)
scan_partial_symbols (pdi->die_child, lowpc, highpc,
set_addrmap, cu);
break;
case DW_TAG_enumeration_type:
if (!pdi->is_declaration)
add_partial_enumeration (pdi, cu);
break;
case DW_TAG_base_type:
case DW_TAG_subrange_type:
/* File scope base type definitions are added to the partial
symbol table. */
add_partial_symbol (pdi, cu);
break;
case DW_TAG_namespace:
add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
break;
case DW_TAG_module:
if (!pdi->is_declaration)
add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
break;
case DW_TAG_imported_unit:
{
struct dwarf2_per_cu_data *per_cu;
/* For now we don't handle imported units in type units. */
if (cu->per_cu->is_debug_types)
{
error (_("Dwarf Error: DW_TAG_imported_unit is not"
" supported in type units [in module %s]"),
objfile_name (cu->per_objfile->objfile));
}
per_cu = dwarf2_find_containing_comp_unit
(pdi->d.sect_off, pdi->is_dwz, cu->per_objfile);
/* Go read the partial unit, if needed. */
if (per_cu->v.psymtab == NULL)
process_psymtab_comp_unit (per_cu, cu->per_objfile, true,
cu->per_cu->lang);
if (pdi->die_parent == nullptr
&& per_cu->unit_type == DW_UT_compile
&& per_cu->lang == language_cplus)
/* Regard import as hint. See corresponding code in
process_imported_unit_die. */
break;
cu->per_cu->imported_symtabs_push (per_cu);
}
break;
case DW_TAG_imported_declaration:
add_partial_symbol (pdi, cu);
break;
default:
break;
}
}
/* If the die has a sibling, skip to the sibling. */
pdi = pdi->die_sibling;
}
}
/* Functions used to compute the fully scoped name of a partial DIE.
Normally, this is simple. For C++, the parent DIE's fully scoped
name is concatenated with "::" and the partial DIE's name.
Enumerators are an exception; they use the scope of their parent
enumeration type, i.e. the name of the enumeration type is not
prepended to the enumerator.
There are two complexities. One is DW_AT_specification; in this
case "parent" means the parent of the target of the specification,
instead of the direct parent of the DIE. The other is compilers
which do not emit DW_TAG_namespace; in this case we try to guess
the fully qualified name of structure types from their members'
linkage names. This must be done using the DIE's children rather
than the children of any DW_AT_specification target. We only need
to do this for structures at the top level, i.e. if the target of
any DW_AT_specification (if any; otherwise the DIE itself) does not
have a parent. */
/* Compute the scope prefix associated with PDI's parent, in
compilation unit CU. The result will be allocated on CU's
comp_unit_obstack, or a copy of the already allocated PDI->NAME
field. NULL is returned if no prefix is necessary. */
static const char *
partial_die_parent_scope (struct partial_die_info *pdi,
struct dwarf2_cu *cu)
{
const char *grandparent_scope;
struct partial_die_info *parent, *real_pdi;
/* We need to look at our parent DIE; if we have a DW_AT_specification,
then this means the parent of the specification DIE. */
real_pdi = pdi;
while (real_pdi->has_specification)
{
auto res = find_partial_die (real_pdi->spec_offset,
real_pdi->spec_is_dwz, cu);
real_pdi = res.pdi;
cu = res.cu;
}
parent = real_pdi->die_parent;
if (parent == NULL)
return NULL;
if (parent->scope_set)
return parent->scope;
parent->fixup (cu);
grandparent_scope = partial_die_parent_scope (parent, cu);
/* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
DW_TAG_namespace DIEs with a name of "::" for the global namespace.
Work around this problem here. */
if (cu->per_cu->lang == language_cplus
&& parent->tag == DW_TAG_namespace
&& strcmp (parent->name (cu), "::") == 0
&& grandparent_scope == NULL)
{
parent->scope = NULL;
parent->scope_set = 1;
return NULL;
}
/* Nested subroutines in Fortran get a prefix. */
if (pdi->tag == DW_TAG_enumerator)
/* Enumerators should not get the name of the enumeration as a prefix. */
parent->scope = grandparent_scope;
else if (parent->tag == DW_TAG_namespace
|| parent->tag == DW_TAG_module
|| parent->tag == DW_TAG_structure_type
|| parent->tag == DW_TAG_class_type
|| parent->tag == DW_TAG_interface_type
|| parent->tag == DW_TAG_union_type
|| parent->tag == DW_TAG_enumeration_type
|| (cu->per_cu->lang == language_fortran
&& parent->tag == DW_TAG_subprogram
&& pdi->tag == DW_TAG_subprogram))
{
if (grandparent_scope == NULL)
parent->scope = parent->name (cu);
else
parent->scope = typename_concat (&cu->comp_unit_obstack,
grandparent_scope,
parent->name (cu), 0, cu);
}
else
{
/* FIXME drow/2004-04-01: What should we be doing with
function-local names? For partial symbols, we should probably be
ignoring them. */
complaint (_("unhandled containing DIE tag %s for DIE at %s"),
dwarf_tag_name (parent->tag),
sect_offset_str (pdi->sect_off));
parent->scope = grandparent_scope;
}
parent->scope_set = 1;
return parent->scope;
}
/* Return the fully scoped name associated with PDI, from compilation unit
CU. The result will be allocated with malloc. */
static gdb::unique_xmalloc_ptr<char>
partial_die_full_name (struct partial_die_info *pdi,
struct dwarf2_cu *cu)
{
const char *parent_scope;
/* If this is a template instantiation, we can not work out the
template arguments from partial DIEs. So, unfortunately, we have
to go through the full DIEs. At least any work we do building
types here will be reused if full symbols are loaded later. */
if (pdi->has_template_arguments)
{
pdi->fixup (cu);
if (pdi->name (cu) != NULL && strchr (pdi->name (cu), '<') == NULL)
{
struct die_info *die;
struct attribute attr;
struct dwarf2_cu *ref_cu = cu;
/* DW_FORM_ref_addr is using section offset. */
attr.name = (enum dwarf_attribute) 0;
attr.form = DW_FORM_ref_addr;
attr.u.unsnd = to_underlying (pdi->sect_off);
die = follow_die_ref (NULL, &attr, &ref_cu);
return make_unique_xstrdup (dwarf2_full_name (NULL, die, ref_cu));
}
}
parent_scope = partial_die_parent_scope (pdi, cu);
if (parent_scope == NULL)
return NULL;
else
return gdb::unique_xmalloc_ptr<char> (typename_concat (NULL, parent_scope,
pdi->name (cu),
0, cu));
}
static void
add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
CORE_ADDR addr = 0;
const char *actual_name = NULL;
CORE_ADDR baseaddr;
baseaddr = objfile->text_section_offset ();
gdb::unique_xmalloc_ptr<char> built_actual_name
= partial_die_full_name (pdi, cu);
if (built_actual_name != NULL)
actual_name = built_actual_name.get ();
if (actual_name == NULL)
actual_name = pdi->name (cu);
partial_symbol psymbol;
memset (&psymbol, 0, sizeof (psymbol));
psymbol.ginfo.set_language (cu->per_cu->lang,
&objfile->objfile_obstack);
psymbol.ginfo.set_section_index (-1);
/* The code below indicates that the psymbol should be installed by
setting this. */
gdb::optional<psymbol_placement> where;
switch (pdi->tag)
{
case DW_TAG_inlined_subroutine:
case DW_TAG_subprogram:
addr = (gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr)
- baseaddr);
if (pdi->is_external
|| cu->per_cu->lang == language_ada
|| (cu->per_cu->lang == language_fortran
&& pdi->die_parent != NULL
&& pdi->die_parent->tag == DW_TAG_subprogram))
{
/* Normally, only "external" DIEs are part of the global scope.
But in Ada and Fortran, we want to be able to access nested
procedures globally. So all Ada and Fortran subprograms are
stored in the global scope. */
where = psymbol_placement::GLOBAL;
}
else
where = psymbol_placement::STATIC;
psymbol.domain = VAR_DOMAIN;
psymbol.aclass = LOC_BLOCK;
psymbol.ginfo.set_section_index (SECT_OFF_TEXT (objfile));
psymbol.ginfo.value.address = addr;
if (pdi->main_subprogram && actual_name != NULL)
set_objfile_main_name (objfile, actual_name, cu->per_cu->lang);
break;
case DW_TAG_constant:
psymbol.domain = VAR_DOMAIN;
psymbol.aclass = LOC_STATIC;
where = (pdi->is_external
? psymbol_placement::GLOBAL
: psymbol_placement::STATIC);
break;
case DW_TAG_variable:
if (pdi->d.locdesc)
addr = decode_locdesc (pdi->d.locdesc, cu);
if (pdi->d.locdesc
&& addr == 0
&& !per_objfile->per_bfd->has_section_at_zero)
{
/* A global or static variable may also have been stripped
out by the linker if unused, in which case its address
will be nullified; do not add such variables into partial
symbol table then. */
}
else if (pdi->is_external)
{
/* Global Variable.
Don't enter into the minimal symbol tables as there is
a minimal symbol table entry from the ELF symbols already.
Enter into partial symbol table if it has a location
descriptor or a type.
If the location descriptor is missing, new_symbol will create
a LOC_UNRESOLVED symbol, the address of the variable will then
be determined from the minimal symbol table whenever the variable
is referenced.
The address for the partial symbol table entry is not
used by GDB, but it comes in handy for debugging partial symbol
table building. */
if (pdi->d.locdesc || pdi->has_type)
{
psymbol.domain = VAR_DOMAIN;
psymbol.aclass = LOC_STATIC;
psymbol.ginfo.set_section_index (SECT_OFF_TEXT (objfile));
psymbol.ginfo.value.address = addr;
where = psymbol_placement::GLOBAL;
}
}
else
{
int has_loc = pdi->d.locdesc != NULL;
/* Static Variable. Skip symbols whose value we cannot know (those
without location descriptors or constant values). */
if (!has_loc && !pdi->has_const_value)
return;
psymbol.domain = VAR_DOMAIN;
psymbol.aclass = LOC_STATIC;
psymbol.ginfo.set_section_index (SECT_OFF_TEXT (objfile));
if (has_loc)
psymbol.ginfo.value.address = addr;
where = psymbol_placement::STATIC;
}
break;
case DW_TAG_array_type:
case DW_TAG_typedef:
case DW_TAG_base_type:
case DW_TAG_subrange_type:
psymbol.domain = VAR_DOMAIN;
psymbol.aclass = LOC_TYPEDEF;
where = psymbol_placement::STATIC;
break;
case DW_TAG_imported_declaration:
case DW_TAG_namespace:
psymbol.domain = VAR_DOMAIN;
psymbol.aclass = LOC_TYPEDEF;
where = psymbol_placement::GLOBAL;
break;
case DW_TAG_module:
/* With Fortran 77 there might be a "BLOCK DATA" module
available without any name. If so, we skip the module as it
doesn't bring any value. */
if (actual_name != nullptr)
{
psymbol.domain = MODULE_DOMAIN;
psymbol.aclass = LOC_TYPEDEF;
where = psymbol_placement::GLOBAL;
}
break;
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_enumeration_type:
/* Skip external references. The DWARF standard says in the section
about "Structure, Union, and Class Type Entries": "An incomplete
structure, union or class type is represented by a structure,
union or class entry that does not have a byte size attribute
and that has a DW_AT_declaration attribute." */
if (!pdi->has_byte_size && pdi->is_declaration)
return;
/* NOTE: carlton/2003-10-07: See comment in new_symbol about
static vs. global. */
psymbol.domain = STRUCT_DOMAIN;
psymbol.aclass = LOC_TYPEDEF;
where = (cu->per_cu->lang == language_cplus
? psymbol_placement::GLOBAL
: psymbol_placement::STATIC);
break;
case DW_TAG_enumerator:
psymbol.domain = VAR_DOMAIN;
psymbol.aclass = LOC_CONST;
where = (cu->per_cu->lang == language_cplus
? psymbol_placement::GLOBAL
: psymbol_placement::STATIC);
break;
default:
break;
}
if (where.has_value ())
{
if (built_actual_name != nullptr)
actual_name = objfile->intern (actual_name);
if (pdi->linkage_name == nullptr
|| cu->per_cu->lang == language_ada)
psymbol.ginfo.set_linkage_name (actual_name);
else
{
psymbol.ginfo.set_demangled_name (actual_name,
&objfile->objfile_obstack);
psymbol.ginfo.set_linkage_name (pdi->linkage_name);
}
cu->per_cu->v.psymtab->add_psymbol
(psymbol, *where, per_objfile->per_bfd->partial_symtabs.get (),
objfile);
}
}
/* Read a partial die corresponding to a namespace; also, add a symbol
corresponding to that namespace to the symbol table. NAMESPACE is
the name of the enclosing namespace. */
static void
add_partial_namespace (struct partial_die_info *pdi,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
int set_addrmap, struct dwarf2_cu *cu)
{
/* Add a symbol for the namespace. */
add_partial_symbol (pdi, cu);
/* Now scan partial symbols in that namespace. */
if (pdi->has_children)
scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
}
/* Read a partial die corresponding to a Fortran module. */
static void
add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
{
/* Add a symbol for the namespace. */
add_partial_symbol (pdi, cu);
/* Now scan partial symbols in that module. */
if (pdi->has_children)
scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
}
static int
dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
dwarf2_psymtab *, dwarf_tag);
/* Read a partial die corresponding to a subprogram or an inlined
subprogram and create a partial symbol for that subprogram.
When the CU language allows it, this routine also defines a partial
symbol for each nested subprogram that this subprogram contains.
If SET_ADDRMAP is true, record the covered ranges in the addrmap.
Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
PDI may also be a lexical block, in which case we simply search
recursively for subprograms defined inside that lexical block.
Again, this is only performed when the CU language allows this
type of definitions. */
static void
add_partial_subprogram (struct partial_die_info *pdi,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
int set_addrmap, struct dwarf2_cu *cu)
{
if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
{
if (pdi->has_pc_info)
{
if (pdi->lowpc < *lowpc)
*lowpc = pdi->lowpc;
if (pdi->highpc > *highpc)
*highpc = pdi->highpc;
if (set_addrmap)
{
struct objfile *objfile = cu->per_objfile->objfile;
dwarf2_per_bfd *per_bfd = cu->per_objfile->per_bfd;
struct gdbarch *gdbarch = objfile->arch ();
CORE_ADDR baseaddr;
CORE_ADDR this_highpc;
CORE_ADDR this_lowpc;
baseaddr = objfile->text_section_offset ();
this_lowpc
= (gdbarch_adjust_dwarf2_addr (gdbarch,
pdi->lowpc + baseaddr)
- baseaddr);
this_highpc
= (gdbarch_adjust_dwarf2_addr (gdbarch,
pdi->highpc + baseaddr)
- baseaddr);
addrmap_set_empty (per_bfd->partial_symtabs->psymtabs_addrmap,
this_lowpc, this_highpc - 1,
cu->per_cu->v.psymtab);
}
}
if (pdi->has_range_info
&& dwarf2_ranges_read (pdi->ranges_offset, &pdi->lowpc, &pdi->highpc,
cu,
set_addrmap ? cu->per_cu->v.psymtab : nullptr,
pdi->tag))
{
if (pdi->lowpc < *lowpc)
*lowpc = pdi->lowpc;
if (pdi->highpc > *highpc)
*highpc = pdi->highpc;
}
if (pdi->has_pc_info || pdi->has_range_info
|| (!pdi->is_external && pdi->may_be_inlined))
{
if (!pdi->is_declaration)
/* Ignore subprogram DIEs that do not have a name, they are
illegal. Do not emit a complaint at this point, we will
do so when we convert this psymtab into a symtab. */
if (pdi->name (cu))
add_partial_symbol (pdi, cu);
}
}
if (! pdi->has_children)
return;
if (cu->per_cu->lang == language_ada
|| cu->per_cu->lang == language_fortran)
{
pdi = pdi->die_child;
while (pdi != NULL)
{
pdi->fixup (cu);
if (pdi->tag == DW_TAG_subprogram
|| pdi->tag == DW_TAG_inlined_subroutine
|| pdi->tag == DW_TAG_lexical_block)
add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
pdi = pdi->die_sibling;
}
}
}
/* Read a partial die corresponding to an enumeration type. */
static void
add_partial_enumeration (struct partial_die_info *enum_pdi,
struct dwarf2_cu *cu)
{
struct partial_die_info *pdi;
if (enum_pdi->name (cu) != NULL)
add_partial_symbol (enum_pdi, cu);
pdi = enum_pdi->die_child;
while (pdi)
{
if (pdi->tag != DW_TAG_enumerator || pdi->raw_name == NULL)
complaint (_("malformed enumerator DIE ignored"));
else
add_partial_symbol (pdi, cu);
pdi = pdi->die_sibling;
}
}
/* Return the initial uleb128 in the die at INFO_PTR. */
static unsigned int
peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
{
unsigned int bytes_read;
return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
}
/* Read the initial uleb128 in the die at INFO_PTR in compilation unit
READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
Return the corresponding abbrev, or NULL if the number is zero (indicating
an empty DIE). In either case *BYTES_READ will be set to the length of
the initial number. */
static const struct abbrev_info *
peek_die_abbrev (const die_reader_specs &reader,
const gdb_byte *info_ptr, unsigned int *bytes_read)
{
dwarf2_cu *cu = reader.cu;
bfd *abfd = reader.abfd;
unsigned int abbrev_number
= read_unsigned_leb128 (abfd, info_ptr, bytes_read);
if (abbrev_number == 0)
return NULL;
const abbrev_info *abbrev
= reader.abbrev_table->lookup_abbrev (abbrev_number);
if (!abbrev)
{
error (_("Dwarf Error: Could not find abbrev number %d in %s"
" at offset %s [in module %s]"),
abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd));
}
return abbrev;
}
/* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
Returns a pointer to the end of a series of DIEs, terminated by an empty
DIE. Any children of the skipped DIEs will also be skipped. */
static const gdb_byte *
skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
{
while (1)
{
unsigned int bytes_read;
const abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr,
&bytes_read);
if (abbrev == NULL)
return info_ptr + bytes_read;
else
info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
}
}
/* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
INFO_PTR should point just after the initial uleb128 of a DIE, and the
abbrev corresponding to that skipped uleb128 should be passed in
ABBREV. Returns a pointer to this DIE's sibling, skipping any
children. */
static const gdb_byte *
skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
const struct abbrev_info *abbrev)
{
unsigned int bytes_read;
struct attribute attr;
bfd *abfd = reader->abfd;
struct dwarf2_cu *cu = reader->cu;
const gdb_byte *buffer = reader->buffer;
const gdb_byte *buffer_end = reader->buffer_end;
unsigned int form, i;
for (i = 0; i < abbrev->num_attrs; i++)
{
/* The only abbrev we care about is DW_AT_sibling. */
if (abbrev->attrs[i].name == DW_AT_sibling)
{
read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
if (attr.form == DW_FORM_ref_addr)
complaint (_("ignoring absolute DW_AT_sibling"));
else
{
sect_offset off = attr.get_ref_die_offset ();
const gdb_byte *sibling_ptr = buffer + to_underlying (off);
if (sibling_ptr < info_ptr)
complaint (_("DW_AT_sibling points backwards"));
else if (sibling_ptr > reader->buffer_end)
reader->die_section->overflow_complaint ();
else
return sibling_ptr;
}
}
/* If it isn't DW_AT_sibling, skip this attribute. */
form = abbrev->attrs[i].form;
skip_attribute:
switch (form)
{
case DW_FORM_ref_addr:
/* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
and later it is offset sized. */
if (cu->header.version == 2)
info_ptr += cu->header.addr_size;
else
info_ptr += cu->header.offset_size;
break;
case DW_FORM_GNU_ref_alt:
info_ptr += cu->header.offset_size;
break;
case DW_FORM_addr:
info_ptr += cu->header.addr_size;
break;
case DW_FORM_data1:
case DW_FORM_ref1:
case DW_FORM_flag:
case DW_FORM_strx1:
info_ptr += 1;
break;
case DW_FORM_flag_present:
case DW_FORM_implicit_const:
break;
case DW_FORM_data2:
case DW_FORM_ref2:
case DW_FORM_strx2:
info_ptr += 2;
break;
case DW_FORM_strx3:
info_ptr += 3;
break;
case DW_FORM_data4:
case DW_FORM_ref4:
case DW_FORM_strx4:
info_ptr += 4;
break;
case DW_FORM_data8:
case DW_FORM_ref8:
case DW_FORM_ref_sig8:
info_ptr += 8;
break;
case DW_FORM_data16:
info_ptr += 16;
break;
case DW_FORM_string:
read_direct_string (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
break;
case DW_FORM_sec_offset:
case DW_FORM_strp:
case DW_FORM_GNU_strp_alt:
info_ptr += cu->header.offset_size;
break;
case DW_FORM_exprloc:
case DW_FORM_block:
info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
break;
case DW_FORM_block1:
info_ptr += 1 + read_1_byte (abfd, info_ptr);
break;
case DW_FORM_block2:
info_ptr += 2 + read_2_bytes (abfd, info_ptr);
break;
case DW_FORM_block4:
info_ptr += 4 + read_4_bytes (abfd, info_ptr);
break;
case DW_FORM_addrx:
case DW_FORM_strx:
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
case DW_FORM_GNU_addr_index:
case DW_FORM_GNU_str_index:
case DW_FORM_rnglistx:
case DW_FORM_loclistx:
info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
break;
case DW_FORM_indirect:
form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
/* We need to continue parsing from here, so just go back to
the top. */
goto skip_attribute;
default:
error (_("Dwarf Error: Cannot handle %s "
"in DWARF reader [in module %s]"),
dwarf_form_name (form),
bfd_get_filename (abfd));
}
}
if (abbrev->has_children)
return skip_children (reader, info_ptr);
else
return info_ptr;
}
/* Locate ORIG_PDI's sibling.
INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
static const gdb_byte *
locate_pdi_sibling (const struct die_reader_specs *reader,
struct partial_die_info *orig_pdi,
const gdb_byte *info_ptr)
{
/* Do we know the sibling already? */
if (orig_pdi->sibling)
return orig_pdi->sibling;
/* Are there any children to deal with? */
if (!orig_pdi->has_children)
return info_ptr;
/* Skip the children the long way. */
return skip_children (reader, info_ptr);
}
/* Expand this partial symbol table into a full symbol table. SELF is
not NULL. */
void
dwarf2_psymtab::read_symtab (struct objfile *objfile)
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
gdb_assert (!per_objfile->symtab_set_p (per_cu_data));
/* If this psymtab is constructed from a debug-only objfile, the
has_section_at_zero flag will not necessarily be correct. We
can get the correct value for this flag by looking at the data
associated with the (presumably stripped) associated objfile. */
if (objfile->separate_debug_objfile_backlink)
{
dwarf2_per_objfile *per_objfile_backlink
= get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
per_objfile->per_bfd->has_section_at_zero
= per_objfile_backlink->per_bfd->has_section_at_zero;
}
expand_psymtab (objfile);
process_cu_includes (per_objfile);
}
/* Reading in full CUs. */
/* Add PER_CU to the queue. */
static void
queue_comp_unit (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
enum language pretend_language)
{
per_cu->queued = 1;
gdb_assert (per_objfile->per_bfd->queue.has_value ());
per_cu->per_bfd->queue->emplace (per_cu, per_objfile, pretend_language);
}
/* If PER_CU is not yet expanded of queued for expansion, add it to the queue.
If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
dependency.
Return true if maybe_queue_comp_unit requires the caller to load the CU's
DIEs, false otherwise.
Explanation: there is an invariant that if a CU is queued for expansion
(present in `dwarf2_per_bfd::queue`), then its DIEs are loaded
(a dwarf2_cu object exists for this CU, and `dwarf2_per_objfile::get_cu`
returns non-nullptr). If the CU gets enqueued by this function but its DIEs
are not yet loaded, the the caller must load the CU's DIEs to ensure the
invariant is respected.
The caller is therefore not required to load the CU's DIEs (we return false)
if:
- the CU is already expanded, and therefore does not get enqueued
- the CU gets enqueued for expansion, but its DIEs are already loaded
Note that the caller should not use this function's return value as an
indicator of whether the CU's DIEs are loaded right now, it should check
that by calling `dwarf2_per_objfile::get_cu` instead. */
static int
maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
enum language pretend_language)
{
/* We may arrive here during partial symbol reading, if we need full
DIEs to process an unusual case (e.g. template arguments). Do
not queue PER_CU, just tell our caller to load its DIEs. */
if (per_cu->per_bfd->reading_partial_symbols)
{
dwarf2_cu *cu = per_objfile->get_cu (per_cu);
if (cu == NULL || cu->dies == NULL)
return 1;
return 0;
}
/* Mark the dependence relation so that we don't flush PER_CU
too early. */
if (dependent_cu != NULL)
dependent_cu->add_dependence (per_cu);
/* If it's already on the queue, we have nothing to do. */
if (per_cu->queued)
{
/* Verify the invariant that if a CU is queued for expansion, its DIEs are
loaded. */
gdb_assert (per_objfile->get_cu (per_cu) != nullptr);
/* If the CU is queued for expansion, it should not already be
expanded. */
gdb_assert (!per_objfile->symtab_set_p (per_cu));
/* The DIEs are already loaded, the caller doesn't need to do it. */
return 0;
}
bool queued = false;
if (!per_objfile->symtab_set_p (per_cu))
{
/* Add it to the queue. */
queue_comp_unit (per_cu, per_objfile, pretend_language);
queued = true;
}
/* If the compilation unit is already loaded, just mark it as
used. */
dwarf2_cu *cu = per_objfile->get_cu (per_cu);
if (cu != nullptr)
cu->last_used = 0;
/* Ask the caller to load the CU's DIEs if the CU got enqueued for expansion
and the DIEs are not already loaded. */
return queued && cu == nullptr;
}
/* Process the queue. */
static void
process_queue (dwarf2_per_objfile *per_objfile)
{
dwarf_read_debug_printf ("Expanding one or more symtabs of objfile %s ...",
objfile_name (per_objfile->objfile));
/* The queue starts out with one item, but following a DIE reference
may load a new CU, adding it to the end of the queue. */
while (!per_objfile->per_bfd->queue->empty ())
{
dwarf2_queue_item &item = per_objfile->per_bfd->queue->front ();
dwarf2_per_cu_data *per_cu = item.per_cu;
if (!per_objfile->symtab_set_p (per_cu))
{
dwarf2_cu *cu = per_objfile->get_cu (per_cu);
/* Skip dummy CUs. */
if (cu != nullptr)
{
unsigned int debug_print_threshold;
char buf[100];
if (per_cu->is_debug_types)
{
struct signatured_type *sig_type =
(struct signatured_type *) per_cu;
sprintf (buf, "TU %s at offset %s",
hex_string (sig_type->signature),
sect_offset_str (per_cu->sect_off));
/* There can be 100s of TUs.
Only print them in verbose mode. */
debug_print_threshold = 2;
}
else
{
sprintf (buf, "CU at offset %s",
sect_offset_str (per_cu->sect_off));
debug_print_threshold = 1;
}
if (dwarf_read_debug >= debug_print_threshold)
dwarf_read_debug_printf ("Expanding symtab of %s", buf);
if (per_cu->is_debug_types)
process_full_type_unit (cu, item.pretend_language);
else
process_full_comp_unit (cu, item.pretend_language);
if (dwarf_read_debug >= debug_print_threshold)
dwarf_read_debug_printf ("Done expanding %s", buf);
}
}
per_cu->queued = 0;
per_objfile->per_bfd->queue->pop ();
}
dwarf_read_debug_printf ("Done expanding symtabs of %s.",
objfile_name (per_objfile->objfile));
}
/* Read in full symbols for PST, and anything it depends on. */
void
dwarf2_psymtab::expand_psymtab (struct objfile *objfile)
{
gdb_assert (!readin_p (objfile));
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
free_cached_comp_units freer (per_objfile);
expand_dependencies (objfile);
dw2_do_instantiate_symtab (per_cu_data, per_objfile, false);
gdb_assert (get_compunit_symtab (objfile) != nullptr);
}
/* See psympriv.h. */
bool
dwarf2_psymtab::readin_p (struct objfile *objfile) const
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
return per_objfile->symtab_set_p (per_cu_data);
}
/* See psympriv.h. */
compunit_symtab *
dwarf2_psymtab::get_compunit_symtab (struct objfile *objfile) const
{
dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
return per_objfile->get_symtab (per_cu_data);
}
/* Trivial hash function for die_info: the hash value of a DIE
is its offset in .debug_info for this objfile. */
static hashval_t
die_hash (const void *item)
{
const struct die_info *die = (const struct die_info *) item;
return to_underlying (die->sect_off);
}
/* Trivial comparison function for die_info structures: two DIEs
are equal if they have the same offset. */
static int
die_eq (const void *item_lhs, const void *item_rhs)
{
const struct die_info *die_lhs = (const struct die_info *) item_lhs;
const struct die_info *die_rhs = (const struct die_info *) item_rhs;
return die_lhs->sect_off == die_rhs->sect_off;
}
/* Load the DIEs associated with PER_CU into memory.
In some cases, the caller, while reading partial symbols, will need to load
the full symbols for the CU for some reason. It will already have a
dwarf2_cu object for THIS_CU and pass it as EXISTING_CU, so it can be re-used
rather than creating a new one. */
static void
load_full_comp_unit (dwarf2_per_cu_data *this_cu,
dwarf2_per_objfile *per_objfile,
dwarf2_cu *existing_cu,
bool skip_partial,
enum language pretend_language)
{
gdb_assert (! this_cu->is_debug_types);
cutu_reader reader (this_cu, per_objfile, NULL, existing_cu, skip_partial);
if (reader.dummy_p)
return;
struct dwarf2_cu *cu = reader.cu;
const gdb_byte *info_ptr = reader.info_ptr;
gdb_assert (cu->die_hash == NULL);
cu->die_hash =
htab_create_alloc_ex (cu->header.length / 12,
die_hash,
die_eq,
NULL,
&cu->comp_unit_obstack,
hashtab_obstack_allocate,
dummy_obstack_deallocate);
if (reader.comp_unit_die->has_children)
reader.comp_unit_die->child
= read_die_and_siblings (&reader, reader.info_ptr,
&info_ptr, reader.comp_unit_die);
cu->dies = reader.comp_unit_die;
/* comp_unit_die is not stored in die_hash, no need. */
/* We try not to read any attributes in this function, because not
all CUs needed for references have been loaded yet, and symbol
table processing isn't initialized. But we have to set the CU language,
or we won't be able to build types correctly.
Similarly, if we do not read the producer, we can not apply
producer-specific interpretation. */
prepare_one_comp_unit (cu, cu->dies, pretend_language);
reader.keep ();
}
/* Add a DIE to the delayed physname list. */
static void
add_to_method_list (struct type *type, int fnfield_index, int index,
const char *name, struct die_info *die,
struct dwarf2_cu *cu)
{
struct delayed_method_info mi;
mi.type = type;
mi.fnfield_index = fnfield_index;
mi.index = index;
mi.name = name;
mi.die = die;
cu->method_list.push_back (mi);
}
/* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
"const" / "volatile". If so, decrements LEN by the length of the
modifier and return true. Otherwise return false. */
template<size_t N>
static bool
check_modifier (const char *physname, size_t &len, const char (&mod)[N])
{
size_t mod_len = sizeof (mod) - 1;
if (len > mod_len && startswith (physname + (len - mod_len), mod))
{
len -= mod_len;
return true;
}
return false;
}
/* Compute the physnames of any methods on the CU's method list.
The computation of method physnames is delayed in order to avoid the
(bad) condition that one of the method's formal parameters is of an as yet
incomplete type. */
static void
compute_delayed_physnames (struct dwarf2_cu *cu)
{
/* Only C++ delays computing physnames. */
if (cu->method_list.empty ())
return;
gdb_assert (cu->per_cu->lang == language_cplus);
for (const delayed_method_info &mi : cu->method_list)
{
const char *physname;
struct fn_fieldlist *fn_flp
= &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
physname = dwarf2_physname (mi.name, mi.die, cu);
TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
= physname ? physname : "";
/* Since there's no tag to indicate whether a method is a
const/volatile overload, extract that information out of the
demangled name. */
if (physname != NULL)
{
size_t len = strlen (physname);
while (1)
{
if (physname[len] == ')') /* shortcut */
break;
else if (check_modifier (physname, len, " const"))
TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
else if (check_modifier (physname, len, " volatile"))
TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
else
break;
}
}
}
/* The list is no longer needed. */
cu->method_list.clear ();
}
/* Go objects should be embedded in a DW_TAG_module DIE,
and it's not clear if/how imported objects will appear.
To keep Go support simple until that's worked out,
go back through what we've read and create something usable.
We could do this while processing each DIE, and feels kinda cleaner,
but that way is more invasive.
This is to, for example, allow the user to type "p var" or "b main"
without having to specify the package name, and allow lookups
of module.object to work in contexts that use the expression
parser. */
static void
fixup_go_packaging (struct dwarf2_cu *cu)
{
gdb::unique_xmalloc_ptr<char> package_name;
struct pending *list;
int i;
for (list = *cu->get_builder ()->get_global_symbols ();
list != NULL;
list = list->next)
{
for (i = 0; i < list->nsyms; ++i)
{
struct symbol *sym = list->symbol[i];
if (sym->language () == language_go
&& SYMBOL_CLASS (sym) == LOC_BLOCK)
{
gdb::unique_xmalloc_ptr<char> this_package_name
(go_symbol_package_name (sym));
if (this_package_name == NULL)
continue;
if (package_name == NULL)
package_name = std::move (this_package_name);
else
{
struct objfile *objfile = cu->per_objfile->objfile;
if (strcmp (package_name.get (), this_package_name.get ()) != 0)
complaint (_("Symtab %s has objects from two different Go packages: %s and %s"),
(symbol_symtab (sym) != NULL
? symtab_to_filename_for_display
(symbol_symtab (sym))
: objfile_name (objfile)),
this_package_name.get (), package_name.get ());
}
}
}
}
if (package_name != NULL)
{
struct objfile *objfile = cu->per_objfile->objfile;
const char *saved_package_name = objfile->intern (package_name.get ());
struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
saved_package_name);
struct symbol *sym;
sym = new (&objfile->objfile_obstack) symbol;
sym->set_language (language_go, &objfile->objfile_obstack);
sym->compute_and_set_names (saved_package_name, false, objfile->per_bfd);
/* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
e.g., "main" finds the "main" module and not C's main(). */
SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
SYMBOL_TYPE (sym) = type;
add_symbol_to_list (sym, cu->get_builder ()->get_global_symbols ());
}
}
/* Allocate a fully-qualified name consisting of the two parts on the
obstack. */
static const char *
rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
{
return obconcat (obstack, p1, "::", p2, (char *) NULL);
}
/* A helper that allocates a variant part to attach to a Rust enum
type. OBSTACK is where the results should be allocated. TYPE is
the type we're processing. DISCRIMINANT_INDEX is the index of the
discriminant. It must be the index of one of the fields of TYPE,
or -1 to mean there is no discriminant (univariant enum).
DEFAULT_INDEX is the index of the default field; or -1 if there is
no default. RANGES is indexed by "effective" field number (the
field index, but omitting the discriminant and default fields) and
must hold the discriminant values used by the variants. Note that
RANGES must have a lifetime at least as long as OBSTACK -- either
already allocated on it, or static. */
static void
alloc_rust_variant (struct obstack *obstack, struct type *type,
int discriminant_index, int default_index,
gdb::array_view<discriminant_range> ranges)
{
/* When DISCRIMINANT_INDEX == -1, we have a univariant enum. */
gdb_assert (discriminant_index == -1
|| (discriminant_index >= 0
&& discriminant_index < type->num_fields ()));
gdb_assert (default_index == -1
|| (default_index >= 0 && default_index < type->num_fields ()));
/* We have one variant for each non-discriminant field. */
int n_variants = type->num_fields ();
if (discriminant_index != -1)
--n_variants;
variant *variants = new (obstack) variant[n_variants];
int var_idx = 0;
int range_idx = 0;
for (int i = 0; i < type->num_fields (); ++i)
{
if (i == discriminant_index)
continue;
variants[var_idx].first_field = i;
variants[var_idx].last_field = i + 1;
/* The default field does not need a range, but other fields do.
We skipped the discriminant above. */
if (i != default_index)
{
variants[var_idx].discriminants = ranges.slice (range_idx, 1);
++range_idx;
}
++var_idx;
}
gdb_assert (range_idx == ranges.size ());
gdb_assert (var_idx == n_variants);
variant_part *part = new (obstack) variant_part;
part->discriminant_index = discriminant_index;
/* If there is no discriminant, then whether it is signed is of no
consequence. */
part->is_unsigned
= (discriminant_index == -1
? false
: type->field (discriminant_index).type ()->is_unsigned ());
part->variants = gdb::array_view<variant> (variants, n_variants);
void *storage = obstack_alloc (obstack, sizeof (gdb::array_view<variant_part>));
gdb::array_view<variant_part> *prop_value
= new (storage) gdb::array_view<variant_part> (part, 1);
struct dynamic_prop prop;
prop.set_variant_parts (prop_value);
type->add_dyn_prop (DYN_PROP_VARIANT_PARTS, prop);
}
/* Some versions of rustc emitted enums in an unusual way.
Ordinary enums were emitted as unions. The first element of each
structure in the union was named "RUST$ENUM$DISR". This element
held the discriminant.
These versions of Rust also implemented the "non-zero"
optimization. When the enum had two values, and one is empty and
the other holds a pointer that cannot be zero, the pointer is used
as the discriminant, with a zero value meaning the empty variant.
Here, the union's first member is of the form
RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
where the fieldnos are the indices of the fields that should be
traversed in order to find the field (which may be several fields deep)
and the variantname is the name of the variant of the case when the
field is zero.
This function recognizes whether TYPE is of one of these forms,
and, if so, smashes it to be a variant type. */
static void
quirk_rust_enum (struct type *type, struct objfile *objfile)
{
gdb_assert (type->code () == TYPE_CODE_UNION);
/* We don't need to deal with empty enums. */
if (type->num_fields () == 0)
return;
#define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
if (type->num_fields () == 1
&& startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
{
const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
/* Decode the field name to find the offset of the
discriminant. */
ULONGEST bit_offset = 0;
struct type *field_type = type->field (0).type ();
while (name[0] >= '0' && name[0] <= '9')
{
char *tail;
unsigned long index = strtoul (name, &tail, 10);
name = tail;
if (*name != '$'
|| index >= field_type->num_fields ()
|| (TYPE_FIELD_LOC_KIND (field_type, index)
!= FIELD_LOC_KIND_BITPOS))
{
complaint (_("Could not parse Rust enum encoding string \"%s\""
"[in module %s]"),
TYPE_FIELD_NAME (type, 0),
objfile_name (objfile));
return;
}
++name;
bit_offset += TYPE_FIELD_BITPOS (field_type, index);
field_type = field_type->field (index).type ();
}
/* Smash this type to be a structure type. We have to do this
because the type has already been recorded. */
type->set_code (TYPE_CODE_STRUCT);
type->set_num_fields (3);
/* Save the field we care about. */
struct field saved_field = type->field (0);
type->set_fields
((struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field)));
/* Put the discriminant at index 0. */
type->field (0).set_type (field_type);
TYPE_FIELD_ARTIFICIAL (type, 0) = 1;
TYPE_FIELD_NAME (type, 0) = "<<discriminant>>";
SET_FIELD_BITPOS (type->field (0), bit_offset);
/* The order of fields doesn't really matter, so put the real
field at index 1 and the data-less field at index 2. */
type->field (1) = saved_field;
TYPE_FIELD_NAME (type, 1)
= rust_last_path_segment (type->field (1).type ()->name ());
type->field (1).type ()->set_name
(rust_fully_qualify (&objfile->objfile_obstack, type->name (),
TYPE_FIELD_NAME (type, 1)));
const char *dataless_name
= rust_fully_qualify (&objfile->objfile_obstack, type->name (),
name);
struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
dataless_name);
type->field (2).set_type (dataless_type);
/* NAME points into the original discriminant name, which
already has the correct lifetime. */
TYPE_FIELD_NAME (type, 2) = name;
SET_FIELD_BITPOS (type->field (2), 0);
/* Indicate that this is a variant type. */
static discriminant_range ranges[1] = { { 0, 0 } };
alloc_rust_variant (&objfile->objfile_obstack, type, 0, 1, ranges);
}
/* A union with a single anonymous field is probably an old-style
univariant enum. */
else if (type->num_fields () == 1 && streq (TYPE_FIELD_NAME (type, 0), ""))
{
/* Smash this type to be a structure type. We have to do this
because the type has already been recorded. */
type->set_code (TYPE_CODE_STRUCT);
struct type *field_type = type->field (0).type ();
const char *variant_name
= rust_last_path_segment (field_type->name ());
TYPE_FIELD_NAME (type, 0) = variant_name;
field_type->set_name
(rust_fully_qualify (&objfile->objfile_obstack,
type->name (), variant_name));
alloc_rust_variant (&objfile->objfile_obstack, type, -1, 0, {});
}
else
{
struct type *disr_type = nullptr;
for (int i = 0; i < type->num_fields (); ++i)
{
disr_type = type->field (i).type ();
if (disr_type->code () != TYPE_CODE_STRUCT)
{
/* All fields of a true enum will be structs. */
return;
}
else if (disr_type->num_fields () == 0)
{
/* Could be data-less variant, so keep going. */
disr_type = nullptr;
}
else if (strcmp (TYPE_FIELD_NAME (disr_type, 0),
"RUST$ENUM$DISR") != 0)
{
/* Not a Rust enum. */
return;
}
else
{
/* Found one. */
break;
}
}
/* If we got here without a discriminant, then it's probably
just a union. */
if (disr_type == nullptr)
return;
/* Smash this type to be a structure type. We have to do this
because the type has already been recorded. */
type->set_code (TYPE_CODE_STRUCT);
/* Make space for the discriminant field. */
struct field *disr_field = &disr_type->field (0);
field *new_fields
= (struct field *) TYPE_ZALLOC (type, ((type->num_fields () + 1)
* sizeof (struct field)));
memcpy (new_fields + 1, type->fields (),
type->num_fields () * sizeof (struct field));
type->set_fields (new_fields);
type->set_num_fields (type->num_fields () + 1);
/* Install the discriminant at index 0 in the union. */
type->field (0) = *disr_field;
TYPE_FIELD_ARTIFICIAL (type, 0) = 1;
TYPE_FIELD_NAME (type, 0) = "<<discriminant>>";
/* We need a way to find the correct discriminant given a
variant name. For convenience we build a map here. */
struct type *enum_type = disr_field->type ();
std::unordered_map<std::string, ULONGEST> discriminant_map;
for (int i = 0; i < enum_type->num_fields (); ++i)
{
if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
{
const char *name
= rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
}
}
int n_fields = type->num_fields ();
/* We don't need a range entry for the discriminant, but we do
need one for every other field, as there is no default
variant. */
discriminant_range *ranges = XOBNEWVEC (&objfile->objfile_obstack,
discriminant_range,
n_fields - 1);
/* Skip the discriminant here. */
for (int i = 1; i < n_fields; ++i)
{
/* Find the final word in the name of this variant's type.
That name can be used to look up the correct
discriminant. */
const char *variant_name
= rust_last_path_segment (type->field (i).type ()->name ());
auto iter = discriminant_map.find (variant_name);
if (iter != discriminant_map.end ())
{
ranges[i - 1].low = iter->second;
ranges[i - 1].high = iter->second;
}
/* In Rust, each element should have the size of the
enclosing enum. */
TYPE_LENGTH (type->field (i).type ()) = TYPE_LENGTH (type);
/* Remove the discriminant field, if it exists. */
struct type *sub_type = type->field (i).type ();
if (sub_type->num_fields () > 0)
{
sub_type->set_num_fields (sub_type->num_fields () - 1);
sub_type->set_fields (sub_type->fields () + 1);
}
TYPE_FIELD_NAME (type, i) = variant_name;
sub_type->set_name
(rust_fully_qualify (&objfile->objfile_obstack,
type->name (), variant_name));
}
/* Indicate that this is a variant type. */
alloc_rust_variant (&objfile->objfile_obstack, type, 0, -1,
gdb::array_view<discriminant_range> (ranges,
n_fields - 1));
}
}
/* Rewrite some Rust unions to be structures with variants parts. */
static void
rust_union_quirks (struct dwarf2_cu *cu)
{
gdb_assert (cu->per_cu->lang == language_rust);
for (type *type_ : cu->rust_unions)
quirk_rust_enum (type_, cu->per_objfile->objfile);
/* We don't need this any more. */
cu->rust_unions.clear ();
}
/* See read.h. */
type_unit_group_unshareable *
dwarf2_per_objfile::get_type_unit_group_unshareable (type_unit_group *tu_group)
{
auto iter = this->m_type_units.find (tu_group);
if (iter != this->m_type_units.end ())
return iter->second.get ();
type_unit_group_unshareable_up uniq (new type_unit_group_unshareable);
type_unit_group_unshareable *result = uniq.get ();
this->m_type_units[tu_group] = std::move (uniq);
return result;
}
struct type *
dwarf2_per_objfile::get_type_for_signatured_type
(signatured_type *sig_type) const
{
auto iter = this->m_type_map.find (sig_type);
if (iter == this->m_type_map.end ())
return nullptr;
return iter->second;
}
void dwarf2_per_objfile::set_type_for_signatured_type
(signatured_type *sig_type, struct type *type)
{
gdb_assert (this->m_type_map.find (sig_type) == this->m_type_map.end ());
this->m_type_map[sig_type] = type;
}
/* A helper function for computing the list of all symbol tables
included by PER_CU. */
static void
recursively_compute_inclusions (std::vector<compunit_symtab *> *result,
htab_t all_children, htab_t all_type_symtabs,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
struct compunit_symtab *immediate_parent)
{
void **slot = htab_find_slot (all_children, per_cu, INSERT);
if (*slot != NULL)
{
/* This inclusion and its children have been processed. */
return;
}
*slot = per_cu;
/* Only add a CU if it has a symbol table. */
compunit_symtab *cust = per_objfile->get_symtab (per_cu);
if (cust != NULL)
{
/* If this is a type unit only add its symbol table if we haven't
seen it yet (type unit per_cu's can share symtabs). */
if (per_cu->is_debug_types)
{
slot = htab_find_slot (all_type_symtabs, cust, INSERT);
if (*slot == NULL)
{
*slot = cust;
result->push_back (cust);
if (cust->user == NULL)
cust->user = immediate_parent;
}
}
else
{
result->push_back (cust);
if (cust->user == NULL)
cust->user = immediate_parent;
}
}
if (!per_cu->imported_symtabs_empty ())
for (dwarf2_per_cu_data *ptr : *per_cu->imported_symtabs)
{
recursively_compute_inclusions (result, all_children,
all_type_symtabs, ptr, per_objfile,
cust);
}
}
/* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
PER_CU. */
static void
compute_compunit_symtab_includes (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile)
{
gdb_assert (! per_cu->is_debug_types);
if (!per_cu->imported_symtabs_empty ())
{
int len;
std::vector<compunit_symtab *> result_symtabs;
compunit_symtab *cust = per_objfile->get_symtab (per_cu);
/* If we don't have a symtab, we can just skip this case. */
if (cust == NULL)
return;
htab_up all_children (htab_create_alloc (1, htab_hash_pointer,
htab_eq_pointer,
NULL, xcalloc, xfree));
htab_up all_type_symtabs (htab_create_alloc (1, htab_hash_pointer,
htab_eq_pointer,
NULL, xcalloc, xfree));
for (dwarf2_per_cu_data *ptr : *per_cu->imported_symtabs)
{
recursively_compute_inclusions (&result_symtabs, all_children.get (),
all_type_symtabs.get (), ptr,
per_objfile, cust);
}
/* Now we have a transitive closure of all the included symtabs. */
len = result_symtabs.size ();
cust->includes
= XOBNEWVEC (&per_objfile->objfile->objfile_obstack,
struct compunit_symtab *, len + 1);
memcpy (cust->includes, result_symtabs.data (),
len * sizeof (compunit_symtab *));
cust->includes[len] = NULL;
}
}
/* Compute the 'includes' field for the symtabs of all the CUs we just
read. */
static void
process_cu_includes (dwarf2_per_objfile *per_objfile)
{
for (dwarf2_per_cu_data *iter : per_objfile->per_bfd->just_read_cus)
{
if (! iter->is_debug_types)
compute_compunit_symtab_includes (iter, per_objfile);
}
per_objfile->per_bfd->just_read_cus.clear ();
}
/* Generate full symbol information for CU, whose DIEs have
already been loaded into memory. */
static void
process_full_comp_unit (dwarf2_cu *cu, enum language pretend_language)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
CORE_ADDR lowpc, highpc;
struct compunit_symtab *cust;
CORE_ADDR baseaddr;
struct block *static_block;
CORE_ADDR addr;
baseaddr = objfile->text_section_offset ();
/* Clear the list here in case something was left over. */
cu->method_list.clear ();
dwarf2_find_base_address (cu->dies, cu);
/* Before we start reading the top-level DIE, ensure it has a valid tag
type. */
switch (cu->dies->tag)
{
case DW_TAG_compile_unit:
case DW_TAG_partial_unit:
case DW_TAG_type_unit:
break;
default:
error (_("Dwarf Error: unexpected tag '%s' at offset %s [in module %s]"),
dwarf_tag_name (cu->dies->tag),
sect_offset_str (cu->per_cu->sect_off),
objfile_name (per_objfile->objfile));
}
/* Do line number decoding in read_file_scope () */
process_die (cu->dies, cu);
/* For now fudge the Go package. */
if (cu->per_cu->lang == language_go)
fixup_go_packaging (cu);
/* Now that we have processed all the DIEs in the CU, all the types
should be complete, and it should now be safe to compute all of the
physnames. */
compute_delayed_physnames (cu);
if (cu->per_cu->lang == language_rust)
rust_union_quirks (cu);
/* Some compilers don't define a DW_AT_high_pc attribute for the
compilation unit. If the DW_AT_high_pc is missing, synthesize
it, by scanning the DIE's below the compilation unit. */
get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
static_block = cu->get_builder ()->end_symtab_get_static_block (addr, 0, 1);
/* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
Also, DW_AT_ranges may record ranges not belonging to any child DIEs
(such as virtual method tables). Record the ranges in STATIC_BLOCK's
addrmap to help ensure it has an accurate map of pc values belonging to
this comp unit. */
dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
cust = cu->get_builder ()->end_symtab_from_static_block (static_block,
SECT_OFF_TEXT (objfile),
0);
if (cust != NULL)
{
int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
/* Set symtab language to language from DW_AT_language. If the
compilation is from a C file generated by language preprocessors, do
not set the language if it was already deduced by start_subfile. */
if (!(cu->per_cu->lang == language_c
&& COMPUNIT_FILETABS (cust)->language != language_unknown))
COMPUNIT_FILETABS (cust)->language = cu->per_cu->lang;
/* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
produce DW_AT_location with location lists but it can be possibly
invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
there were bugs in prologue debug info, fixed later in GCC-4.5
by "unwind info for epilogues" patch (which is not directly related).
For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
needed, it would be wrong due to missing DW_AT_producer there.
Still one can confuse GDB by using non-standard GCC compilation
options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
*/
if (cu->has_loclist && gcc_4_minor >= 5)
cust->locations_valid = 1;
if (gcc_4_minor >= 5)
cust->epilogue_unwind_valid = 1;
cust->call_site_htab = cu->call_site_htab;
}
per_objfile->set_symtab (cu->per_cu, cust);
/* Push it for inclusion processing later. */
per_objfile->per_bfd->just_read_cus.push_back (cu->per_cu);
/* Not needed any more. */
cu->reset_builder ();
}
/* Generate full symbol information for type unit CU, whose DIEs have
already been loaded into memory. */
static void
process_full_type_unit (dwarf2_cu *cu,
enum language pretend_language)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct compunit_symtab *cust;
struct signatured_type *sig_type;
gdb_assert (cu->per_cu->is_debug_types);
sig_type = (struct signatured_type *) cu->per_cu;
/* Clear the list here in case something was left over. */
cu->method_list.clear ();
/* The symbol tables are set up in read_type_unit_scope. */
process_die (cu->dies, cu);
/* For now fudge the Go package. */
if (cu->per_cu->lang == language_go)
fixup_go_packaging (cu);
/* Now that we have processed all the DIEs in the CU, all the types
should be complete, and it should now be safe to compute all of the
physnames. */
compute_delayed_physnames (cu);
if (cu->per_cu->lang == language_rust)
rust_union_quirks (cu);
/* TUs share symbol tables.
If this is the first TU to use this symtab, complete the construction
of it with end_expandable_symtab. Otherwise, complete the addition of
this TU's symbols to the existing symtab. */
type_unit_group_unshareable *tug_unshare =
per_objfile->get_type_unit_group_unshareable (sig_type->type_unit_group);
if (tug_unshare->compunit_symtab == NULL)
{
buildsym_compunit *builder = cu->get_builder ();
cust = builder->end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
tug_unshare->compunit_symtab = cust;
if (cust != NULL)
{
/* Set symtab language to language from DW_AT_language. If the
compilation is from a C file generated by language preprocessors,
do not set the language if it was already deduced by
start_subfile. */
if (!(cu->per_cu->lang == language_c
&& COMPUNIT_FILETABS (cust)->language != language_c))
COMPUNIT_FILETABS (cust)->language = cu->per_cu->lang;
}
}
else
{
cu->get_builder ()->augment_type_symtab ();
cust = tug_unshare->compunit_symtab;
}
per_objfile->set_symtab (cu->per_cu, cust);
/* Not needed any more. */
cu->reset_builder ();
}
/* Process an imported unit DIE. */
static void
process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
/* For now we don't handle imported units in type units. */
if (cu->per_cu->is_debug_types)
{
error (_("Dwarf Error: DW_TAG_imported_unit is not"
" supported in type units [in module %s]"),
objfile_name (cu->per_objfile->objfile));
}
attr = dwarf2_attr (die, DW_AT_import, cu);
if (attr != NULL)
{
sect_offset sect_off = attr->get_ref_die_offset ();
bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
dwarf2_per_objfile *per_objfile = cu->per_objfile;
dwarf2_per_cu_data *per_cu
= dwarf2_find_containing_comp_unit (sect_off, is_dwz, per_objfile);
/* We're importing a C++ compilation unit with tag DW_TAG_compile_unit
into another compilation unit, at root level. Regard this as a hint,
and ignore it. */
if (die->parent && die->parent->parent == NULL
&& per_cu->unit_type == DW_UT_compile
&& per_cu->lang == language_cplus)
return;
/* If necessary, add it to the queue and load its DIEs. */
if (maybe_queue_comp_unit (cu, per_cu, per_objfile,
cu->per_cu->lang))
load_full_comp_unit (per_cu, per_objfile, per_objfile->get_cu (per_cu),
false, cu->per_cu->lang);
cu->per_cu->imported_symtabs_push (per_cu);
}
}
/* RAII object that represents a process_die scope: i.e.,
starts/finishes processing a DIE. */
class process_die_scope
{
public:
process_die_scope (die_info *die, dwarf2_cu *cu)
: m_die (die), m_cu (cu)
{
/* We should only be processing DIEs not already in process. */
gdb_assert (!m_die->in_process);
m_die->in_process = true;
}
~process_die_scope ()
{
m_die->in_process = false;
/* If we're done processing the DIE for the CU that owns the line
header, we don't need the line header anymore. */
if (m_cu->line_header_die_owner == m_die)
{
delete m_cu->line_header;
m_cu->line_header = NULL;
m_cu->line_header_die_owner = NULL;
}
}
private:
die_info *m_die;
dwarf2_cu *m_cu;
};
/* Process a die and its children. */
static void
process_die (struct die_info *die, struct dwarf2_cu *cu)
{
process_die_scope scope (die, cu);
switch (die->tag)
{
case DW_TAG_padding:
break;
case DW_TAG_compile_unit:
case DW_TAG_partial_unit:
read_file_scope (die, cu);
break;
case DW_TAG_type_unit:
read_type_unit_scope (die, cu);
break;
case DW_TAG_subprogram:
/* Nested subprograms in Fortran get a prefix. */
if (cu->per_cu->lang == language_fortran
&& die->parent != NULL
&& die->parent->tag == DW_TAG_subprogram)
cu->processing_has_namespace_info = true;
/* Fall through. */
case DW_TAG_inlined_subroutine:
read_func_scope (die, cu);
break;
case DW_TAG_lexical_block:
case DW_TAG_try_block:
case DW_TAG_catch_block:
read_lexical_block_scope (die, cu);
break;
case DW_TAG_call_site:
case DW_TAG_GNU_call_site:
read_call_site_scope (die, cu);
break;
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
process_structure_scope (die, cu);
break;
case DW_TAG_enumeration_type:
process_enumeration_scope (die, cu);
break;
/* These dies have a type, but processing them does not create
a symbol or recurse to process the children. Therefore we can
read them on-demand through read_type_die. */
case DW_TAG_subroutine_type:
case DW_TAG_set_type:
case DW_TAG_pointer_type:
case DW_TAG_ptr_to_member_type:
case DW_TAG_reference_type:
case DW_TAG_rvalue_reference_type:
case DW_TAG_string_type:
break;
case DW_TAG_array_type:
/* We only need to handle this case for Ada -- in other
languages, it's normal for the compiler to emit a typedef
instead. */
if (cu->per_cu->lang != language_ada)
break;
/* FALLTHROUGH */
case DW_TAG_base_type:
case DW_TAG_subrange_type:
case DW_TAG_typedef:
/* Add a typedef symbol for the type definition, if it has a
DW_AT_name. */
new_symbol (die, read_type_die (die, cu), cu);
break;
case DW_TAG_common_block:
read_common_block (die, cu);
break;
case DW_TAG_common_inclusion:
break;
case DW_TAG_namespace:
cu->processing_has_namespace_info = true;
read_namespace (die, cu);
break;
case DW_TAG_module:
cu->processing_has_namespace_info = true;
read_module (die, cu);
break;
case DW_TAG_imported_declaration:
cu->processing_has_namespace_info = true;
if (read_namespace_alias (die, cu))
break;
/* The declaration is not a global namespace alias. */
/* Fall through. */
case DW_TAG_imported_module:
cu->processing_has_namespace_info = true;
if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
|| cu->per_cu->lang != language_fortran))
complaint (_("Tag '%s' has unexpected children"),
dwarf_tag_name (die->tag));
read_import_statement (die, cu);
break;
case DW_TAG_imported_unit:
process_imported_unit_die (die, cu);
break;
case DW_TAG_variable:
read_variable (die, cu);
break;
default:
new_symbol (die, NULL, cu);
break;
}
}
/* DWARF name computation. */
/* A helper function for dwarf2_compute_name which determines whether DIE
needs to have the name of the scope prepended to the name listed in the
die. */
static int
die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
switch (die->tag)
{
case DW_TAG_namespace:
case DW_TAG_typedef:
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_enumeration_type:
case DW_TAG_enumerator:
case DW_TAG_subprogram:
case DW_TAG_inlined_subroutine:
case DW_TAG_member:
case DW_TAG_imported_declaration:
return 1;
case DW_TAG_variable:
case DW_TAG_constant:
/* We only need to prefix "globally" visible variables. These include
any variable marked with DW_AT_external or any variable that
lives in a namespace. [Variables in anonymous namespaces
require prefixing, but they are not DW_AT_external.] */
if (dwarf2_attr (die, DW_AT_specification, cu))
{
struct dwarf2_cu *spec_cu = cu;
return die_needs_namespace (die_specification (die, &spec_cu),
spec_cu);
}
attr = dwarf2_attr (die, DW_AT_external, cu);
if (attr == NULL && die->parent->tag != DW_TAG_namespace
&& die->parent->tag != DW_TAG_module)
return 0;
/* A variable in a lexical block of some kind does not need a
namespace, even though in C++ such variables may be external
and have a mangled name. */
if (die->parent->tag == DW_TAG_lexical_block
|| die->parent->tag == DW_TAG_try_block
|| die->parent->tag == DW_TAG_catch_block
|| die->parent->tag == DW_TAG_subprogram)
return 0;
return 1;
default:
return 0;
}
}
/* Return the DIE's linkage name attribute, either DW_AT_linkage_name
or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
defined for the given DIE. */
static struct attribute *
dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
if (attr == NULL)
attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
return attr;
}
/* Return the DIE's linkage name as a string, either DW_AT_linkage_name
or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
defined for the given DIE. */
static const char *
dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
{
const char *linkage_name;
linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
if (linkage_name == NULL)
linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
/* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
See https://github.com/rust-lang/rust/issues/32925. */
if (cu->per_cu->lang == language_rust && linkage_name != NULL
&& strchr (linkage_name, '{') != NULL)
linkage_name = NULL;
return linkage_name;
}
/* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
compute the physname for the object, which include a method's:
- formal parameters (C++),
- receiver type (Go),
The term "physname" is a bit confusing.
For C++, for example, it is the demangled name.
For Go, for example, it's the mangled name.
For Ada, return the DIE's linkage name rather than the fully qualified
name. PHYSNAME is ignored..
The result is allocated on the objfile->per_bfd's obstack and
canonicalized. */
static const char *
dwarf2_compute_name (const char *name,
struct die_info *die, struct dwarf2_cu *cu,
int physname)
{
struct objfile *objfile = cu->per_objfile->objfile;
if (name == NULL)
name = dwarf2_name (die, cu);
enum language lang = cu->per_cu->lang;
/* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
but otherwise compute it by typename_concat inside GDB.
FIXME: Actually this is not really true, or at least not always true.
It's all very confusing. compute_and_set_names doesn't try to demangle
Fortran names because there is no mangling standard. So new_symbol
will set the demangled name to the result of dwarf2_full_name, and it is
the demangled name that GDB uses if it exists. */
if (lang == language_ada
|| (lang == language_fortran && physname))
{
/* For Ada unit, we prefer the linkage name over the name, as
the former contains the exported name, which the user expects
to be able to reference. Ideally, we want the user to be able
to reference this entity using either natural or linkage name,
but we haven't started looking at this enhancement yet. */
const char *linkage_name = dw2_linkage_name (die, cu);
if (linkage_name != NULL)
return linkage_name;
}
/* These are the only languages we know how to qualify names in. */
if (name != NULL
&& (lang == language_cplus
|| lang == language_fortran || lang == language_d
|| lang == language_rust))
{
if (die_needs_namespace (die, cu))
{
const char *prefix;
const char *canonical_name = NULL;
string_file buf;
prefix = determine_prefix (die, cu);
if (*prefix != '\0')
{
gdb::unique_xmalloc_ptr<char> prefixed_name
(typename_concat (NULL, prefix, name, physname, cu));
buf.puts (prefixed_name.get ());
}
else
buf.puts (name);
/* Template parameters may be specified in the DIE's DW_AT_name, or
as children with DW_TAG_template_type_param or
DW_TAG_value_type_param. If the latter, add them to the name
here. If the name already has template parameters, then
skip this step; some versions of GCC emit both, and
it is more efficient to use the pre-computed name.
Something to keep in mind about this process: it is very
unlikely, or in some cases downright impossible, to produce
something that will match the mangled name of a function.
If the definition of the function has the same debug info,
we should be able to match up with it anyway. But fallbacks
using the minimal symbol, for instance to find a method
implemented in a stripped copy of libstdc++, will not work.
If we do not have debug info for the definition, we will have to
match them up some other way.
When we do name matching there is a related problem with function
templates; two instantiated function templates are allowed to
differ only by their return types, which we do not add here. */
if (lang == language_cplus && strchr (name, '<') == NULL)
{
struct attribute *attr;
struct die_info *child;
int first = 1;
die->building_fullname = 1;
for (child = die->child; child != NULL; child = child->sibling)
{
struct type *type;
LONGEST value;
const gdb_byte *bytes;
struct dwarf2_locexpr_baton *baton;
struct value *v;
if (child->tag != DW_TAG_template_type_param
&& child->tag != DW_TAG_template_value_param)
continue;
if (first)
{
buf.puts ("<");
first = 0;
}
else
buf.puts (", ");
attr = dwarf2_attr (child, DW_AT_type, cu);
if (attr == NULL)
{
complaint (_("template parameter missing DW_AT_type"));
buf.puts ("UNKNOWN_TYPE");
continue;
}
type = die_type (child, cu);
if (child->tag == DW_TAG_template_type_param)
{
cu->language_defn->print_type (type, "", &buf, -1, 0,
&type_print_raw_options);
continue;
}
attr = dwarf2_attr (child, DW_AT_const_value, cu);
if (attr == NULL)
{
complaint (_("template parameter missing "
"DW_AT_const_value"));
buf.puts ("UNKNOWN_VALUE");
continue;
}
dwarf2_const_value_attr (attr, type, name,
&cu->comp_unit_obstack, cu,
&value, &bytes, &baton);
if (type->has_no_signedness ())
/* GDB prints characters as NUMBER 'CHAR'. If that's
changed, this can use value_print instead. */
cu->language_defn->printchar (value, type, &buf);
else
{
struct value_print_options opts;
if (baton != NULL)
v = dwarf2_evaluate_loc_desc (type, NULL,
baton->data,
baton->size,
baton->per_cu,
baton->per_objfile);
else if (bytes != NULL)
{
v = allocate_value (type);
memcpy (value_contents_writeable (v), bytes,
TYPE_LENGTH (type));
}
else
v = value_from_longest (type, value);
/* Specify decimal so that we do not depend on
the radix. */
get_formatted_print_options (&opts, 'd');
opts.raw = 1;
value_print (v, &buf, &opts);
release_value (v);
}
}
die->building_fullname = 0;
if (!first)
{
/* Close the argument list, with a space if necessary
(nested templates). */
if (!buf.empty () && buf.string ().back () == '>')
buf.puts (" >");
else
buf.puts (">");
}
}
/* For C++ methods, append formal parameter type
information, if PHYSNAME. */
if (physname && die->tag == DW_TAG_subprogram
&& lang == language_cplus)
{
struct type *type = read_type_die (die, cu);
c_type_print_args (type, &buf, 1, lang,
&type_print_raw_options);
if (lang == language_cplus)
{
/* Assume that an artificial first parameter is
"this", but do not crash if it is not. RealView
marks unnamed (and thus unused) parameters as
artificial; there is no way to differentiate
the two cases. */
if (type->num_fields () > 0
&& TYPE_FIELD_ARTIFICIAL (type, 0)
&& type->field (0).type ()->code () == TYPE_CODE_PTR
&& TYPE_CONST (TYPE_TARGET_TYPE (type->field (0).type ())))
buf.puts (" const");
}
}
const std::string &intermediate_name = buf.string ();
if (lang == language_cplus)
canonical_name
= dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
objfile);
/* If we only computed INTERMEDIATE_NAME, or if
INTERMEDIATE_NAME is already canonical, then we need to
intern it. */
if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
name = objfile->intern (intermediate_name);
else
name = canonical_name;
}
}
return name;
}
/* Return the fully qualified name of DIE, based on its DW_AT_name.
If scope qualifiers are appropriate they will be added. The result
will be allocated on the storage_obstack, or NULL if the DIE does
not have a name. NAME may either be from a previous call to
dwarf2_name or NULL.
The output string will be canonicalized (if C++). */
static const char *
dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
{
return dwarf2_compute_name (name, die, cu, 0);
}
/* Construct a physname for the given DIE in CU. NAME may either be
from a previous call to dwarf2_name or NULL. The result will be
allocated on the objfile_objstack or NULL if the DIE does not have a
name.
The output string will be canonicalized (if C++). */
static const char *
dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
const char *retval, *mangled = NULL, *canon = NULL;
int need_copy = 1;
/* In this case dwarf2_compute_name is just a shortcut not building anything
on its own. */
if (!die_needs_namespace (die, cu))
return dwarf2_compute_name (name, die, cu, 1);
if (cu->per_cu->lang != language_rust)
mangled = dw2_linkage_name (die, cu);
/* DW_AT_linkage_name is missing in some cases - depend on what GDB
has computed. */
gdb::unique_xmalloc_ptr<char> demangled;
if (mangled != NULL)
{
if (cu->language_defn->store_sym_names_in_linkage_form_p ())
{
/* Do nothing (do not demangle the symbol name). */
}
else
{
/* Use DMGL_RET_DROP for C++ template functions to suppress
their return type. It is easier for GDB users to search
for such functions as `name(params)' than `long name(params)'.
In such case the minimal symbol names do not match the full
symbol names but for template functions there is never a need
to look up their definition from their declaration so
the only disadvantage remains the minimal symbol variant
`long name(params)' does not have the proper inferior type. */
demangled.reset (gdb_demangle (mangled,
(DMGL_PARAMS | DMGL_ANSI
| DMGL_RET_DROP)));
}
if (demangled)
canon = demangled.get ();
else
{
canon = mangled;
need_copy = 0;
}
}
if (canon == NULL || check_physname)
{
const char *physname = dwarf2_compute_name (name, die, cu, 1);
if (canon != NULL && strcmp (physname, canon) != 0)
{
/* It may not mean a bug in GDB. The compiler could also
compute DW_AT_linkage_name incorrectly. But in such case
GDB would need to be bug-to-bug compatible. */
complaint (_("Computed physname <%s> does not match demangled <%s> "
"(from linkage <%s>) - DIE at %s [in module %s]"),
physname, canon, mangled, sect_offset_str (die->sect_off),
objfile_name (objfile));
/* Prefer DW_AT_linkage_name (in the CANON form) - when it
is available here - over computed PHYSNAME. It is safer
against both buggy GDB and buggy compilers. */
retval = canon;
}
else
{
retval = physname;
need_copy = 0;
}
}
else
retval = canon;
if (need_copy)
retval = objfile->intern (retval);
return retval;
}
/* Inspect DIE in CU for a namespace alias. If one exists, record
a new symbol for it.
Returns 1 if a namespace alias was recorded, 0 otherwise. */
static int
read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
/* If the die does not have a name, this is not a namespace
alias. */
attr = dwarf2_attr (die, DW_AT_name, cu);
if (attr != NULL)
{
int num;
struct die_info *d = die;
struct dwarf2_cu *imported_cu = cu;
/* If the compiler has nested DW_AT_imported_declaration DIEs,
keep inspecting DIEs until we hit the underlying import. */
#define MAX_NESTED_IMPORTED_DECLARATIONS 100
for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
{
attr = dwarf2_attr (d, DW_AT_import, cu);
if (attr == NULL)
break;
d = follow_die_ref (d, attr, &imported_cu);
if (d->tag != DW_TAG_imported_declaration)
break;
}
if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
{
complaint (_("DIE at %s has too many recursively imported "
"declarations"), sect_offset_str (d->sect_off));
return 0;
}
if (attr != NULL)
{
struct type *type;
sect_offset sect_off = attr->get_ref_die_offset ();
type = get_die_type_at_offset (sect_off, cu->per_cu, cu->per_objfile);
if (type != NULL && type->code () == TYPE_CODE_NAMESPACE)
{
/* This declaration is a global namespace alias. Add
a symbol for it whose type is the aliased namespace. */
new_symbol (die, type, cu);
return 1;
}
}
}
return 0;
}
/* Return the using directives repository (global or local?) to use in the
current context for CU.
For Ada, imported declarations can materialize renamings, which *may* be
global. However it is impossible (for now?) in DWARF to distinguish
"external" imported declarations and "static" ones. As all imported
declarations seem to be static in all other languages, make them all CU-wide
global only in Ada. */
static struct using_direct **
using_directives (struct dwarf2_cu *cu)
{
if (cu->per_cu->lang == language_ada
&& cu->get_builder ()->outermost_context_p ())
return cu->get_builder ()->get_global_using_directives ();
else
return cu->get_builder ()->get_local_using_directives ();
}
/* Read the import statement specified by the given die and record it. */
static void
read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct attribute *import_attr;
struct die_info *imported_die, *child_die;
struct dwarf2_cu *imported_cu;
const char *imported_name;
const char *imported_name_prefix;
const char *canonical_name;
const char *import_alias;
const char *imported_declaration = NULL;
const char *import_prefix;
std::vector<const char *> excludes;
import_attr = dwarf2_attr (die, DW_AT_import, cu);
if (import_attr == NULL)
{
complaint (_("Tag '%s' has no DW_AT_import"),
dwarf_tag_name (die->tag));
return;
}
imported_cu = cu;
imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
imported_name = dwarf2_name (imported_die, imported_cu);
if (imported_name == NULL)
{
/* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
The import in the following code:
namespace A
{
typedef int B;
}
int main ()
{
using A::B;
B b;
return b;
}
...
<2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
<52> DW_AT_decl_file : 1
<53> DW_AT_decl_line : 6
<54> DW_AT_import : <0x75>
<2><58>: Abbrev Number: 4 (DW_TAG_typedef)
<59> DW_AT_name : B
<5b> DW_AT_decl_file : 1
<5c> DW_AT_decl_line : 2
<5d> DW_AT_type : <0x6e>
...
<1><75>: Abbrev Number: 7 (DW_TAG_base_type)
<76> DW_AT_byte_size : 4
<77> DW_AT_encoding : 5 (signed)
imports the wrong die ( 0x75 instead of 0x58 ).
This case will be ignored until the gcc bug is fixed. */
return;
}
/* Figure out the local name after import. */
import_alias = dwarf2_name (die, cu);
/* Figure out where the statement is being imported to. */
import_prefix = determine_prefix (die, cu);
/* Figure out what the scope of the imported die is and prepend it
to the name of the imported die. */
imported_name_prefix = determine_prefix (imported_die, imported_cu);
if (imported_die->tag != DW_TAG_namespace
&& imported_die->tag != DW_TAG_module)
{
imported_declaration = imported_name;
canonical_name = imported_name_prefix;
}
else if (strlen (imported_name_prefix) > 0)
canonical_name = obconcat (&objfile->objfile_obstack,
imported_name_prefix,
(cu->per_cu->lang == language_d
? "."
: "::"),
imported_name, (char *) NULL);
else
canonical_name = imported_name;
if (die->tag == DW_TAG_imported_module
&& cu->per_cu->lang == language_fortran)
for (child_die = die->child; child_die && child_die->tag;
child_die = child_die->sibling)
{
/* DWARF-4: A Fortran use statement with a “rename list” may be
represented by an imported module entry with an import attribute
referring to the module and owned entries corresponding to those
entities that are renamed as part of being imported. */
if (child_die->tag != DW_TAG_imported_declaration)
{
complaint (_("child DW_TAG_imported_declaration expected "
"- DIE at %s [in module %s]"),
sect_offset_str (child_die->sect_off),
objfile_name (objfile));
continue;
}
import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
if (import_attr == NULL)
{
complaint (_("Tag '%s' has no DW_AT_import"),
dwarf_tag_name (child_die->tag));
continue;
}
imported_cu = cu;
imported_die = follow_die_ref_or_sig (child_die, import_attr,
&imported_cu);
imported_name = dwarf2_name (imported_die, imported_cu);
if (imported_name == NULL)
{
complaint (_("child DW_TAG_imported_declaration has unknown "
"imported name - DIE at %s [in module %s]"),
sect_offset_str (child_die->sect_off),
objfile_name (objfile));
continue;
}
excludes.push_back (imported_name);
process_die (child_die, cu);
}
add_using_directive (using_directives (cu),
import_prefix,
canonical_name,
import_alias,
imported_declaration,
excludes,
0,
&objfile->objfile_obstack);
}
/* ICC<14 does not output the required DW_AT_declaration on incomplete
types, but gives them a size of zero. Starting with version 14,
ICC is compatible with GCC. */
static bool
producer_is_icc_lt_14 (struct dwarf2_cu *cu)
{
if (!cu->checked_producer)
check_producer (cu);
return cu->producer_is_icc_lt_14;
}
/* ICC generates a DW_AT_type for C void functions. This was observed on
ICC 14.0.5.212, and appears to be against the DWARF spec (V5 3.3.2)
which says that void functions should not have a DW_AT_type. */
static bool
producer_is_icc (struct dwarf2_cu *cu)
{
if (!cu->checked_producer)
check_producer (cu);
return cu->producer_is_icc;
}
/* Check for possibly missing DW_AT_comp_dir with relative .debug_line
directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
this, it was first present in GCC release 4.3.0. */
static bool
producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
{
if (!cu->checked_producer)
check_producer (cu);
return cu->producer_is_gcc_lt_4_3;
}
static file_and_directory
find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
{
file_and_directory res;
/* Find the filename. Do not use dwarf2_name here, since the filename
is not a source language identifier. */
res.name = dwarf2_string_attr (die, DW_AT_name, cu);
res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
if (res.comp_dir == NULL
&& producer_is_gcc_lt_4_3 (cu) && res.name != NULL
&& IS_ABSOLUTE_PATH (res.name))
{
std::string comp_dir_storage = ldirname (res.name);
if (!comp_dir_storage.empty ())
res.comp_dir
= cu->per_objfile->objfile->intern (comp_dir_storage.c_str ());
}
if (res.comp_dir != NULL)
{
/* Irix 6.2 native cc prepends <machine>.: to the compilation
directory, get rid of it. */
const char *cp = strchr (res.comp_dir, ':');
if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
res.comp_dir = cp + 1;
}
if (res.name == NULL)
res.name = "<unknown>";
return res;
}
/* Handle DW_AT_stmt_list for a compilation unit.
DIE is the DW_TAG_compile_unit die for CU.
COMP_DIR is the compilation directory. LOWPC is passed to
dwarf_decode_lines. See dwarf_decode_lines comments about it. */
static void
handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
const file_and_directory &fnd, CORE_ADDR lowpc) /* ARI: editCase function */
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct attribute *attr;
struct line_header line_header_local;
hashval_t line_header_local_hash;
void **slot;
int decode_mapping;
gdb_assert (! cu->per_cu->is_debug_types);
attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
if (attr == NULL || !attr->form_is_unsigned ())
return;
sect_offset line_offset = (sect_offset) attr->as_unsigned ();
/* The line header hash table is only created if needed (it exists to
prevent redundant reading of the line table for partial_units).
If we're given a partial_unit, we'll need it. If we're given a
compile_unit, then use the line header hash table if it's already
created, but don't create one just yet. */
if (per_objfile->line_header_hash == NULL
&& die->tag == DW_TAG_partial_unit)
{
per_objfile->line_header_hash
.reset (htab_create_alloc (127, line_header_hash_voidp,
line_header_eq_voidp,
htab_delete_entry<line_header>,
xcalloc, xfree));
}
line_header_local.sect_off = line_offset;
line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
line_header_local_hash = line_header_hash (&line_header_local);
if (per_objfile->line_header_hash != NULL)
{
slot = htab_find_slot_with_hash (per_objfile->line_header_hash.get (),
&line_header_local,
line_header_local_hash, NO_INSERT);
/* For DW_TAG_compile_unit we need info like symtab::linetable which
is not present in *SLOT (since if there is something in *SLOT then
it will be for a partial_unit). */
if (die->tag == DW_TAG_partial_unit && slot != NULL)
{
gdb_assert (*slot != NULL);
cu->line_header = (struct line_header *) *slot;
return;
}
}
/* dwarf_decode_line_header does not yet provide sufficient information.
We always have to call also dwarf_decode_lines for it. */
line_header_up lh = dwarf_decode_line_header (line_offset, cu);
if (lh == NULL)
return;
cu->line_header = lh.release ();
cu->line_header_die_owner = die;
if (per_objfile->line_header_hash == NULL)
slot = NULL;
else
{
slot = htab_find_slot_with_hash (per_objfile->line_header_hash.get (),
&line_header_local,
line_header_local_hash, INSERT);
gdb_assert (slot != NULL);
}
if (slot != NULL && *slot == NULL)
{
/* This newly decoded line number information unit will be owned
by line_header_hash hash table. */
*slot = cu->line_header;
cu->line_header_die_owner = NULL;
}
else
{
/* We cannot free any current entry in (*slot) as that struct line_header
may be already used by multiple CUs. Create only temporary decoded
line_header for this CU - it may happen at most once for each line
number information unit. And if we're not using line_header_hash
then this is what we want as well. */
gdb_assert (die->tag != DW_TAG_partial_unit);
}
decode_mapping = (die->tag != DW_TAG_partial_unit);
dwarf_decode_lines (cu->line_header, fnd, cu, nullptr, lowpc,
decode_mapping);
}
/* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
static void
read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
CORE_ADDR lowpc = ((CORE_ADDR) -1);
CORE_ADDR highpc = ((CORE_ADDR) 0);
struct attribute *attr;
struct die_info *child_die;
CORE_ADDR baseaddr;
prepare_one_comp_unit (cu, die, cu->per_cu->lang);
baseaddr = objfile->text_section_offset ();
get_scope_pc_bounds (die, &lowpc, &highpc, cu);
/* If we didn't find a lowpc, set it to highpc to avoid complaints
from finish_block. */
if (lowpc == ((CORE_ADDR) -1))
lowpc = highpc;
lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
file_and_directory fnd = find_file_and_directory (die, cu);
cu->start_symtab (fnd.name, fnd.comp_dir, lowpc);
gdb_assert (per_objfile->sym_cu == nullptr);
scoped_restore restore_sym_cu
= make_scoped_restore (&per_objfile->sym_cu, cu);
/* Decode line number information if present. We do this before
processing child DIEs, so that the line header table is available
for DW_AT_decl_file. */
handle_DW_AT_stmt_list (die, cu, fnd, lowpc);
/* Process all dies in compilation unit. */
if (die->child != NULL)
{
child_die = die->child;
while (child_die && child_die->tag)
{
process_die (child_die, cu);
child_die = child_die->sibling;
}
}
per_objfile->sym_cu = nullptr;
/* Decode macro information, if present. Dwarf 2 macro information
refers to information in the line number info statement program
header, so we can only read it if we've read the header
successfully. */
attr = dwarf2_attr (die, DW_AT_macros, cu);
if (attr == NULL)
attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
if (attr != nullptr && attr->form_is_unsigned () && cu->line_header)
{
if (dwarf2_attr (die, DW_AT_macro_info, cu))
complaint (_("CU refers to both DW_AT_macros and DW_AT_macro_info"));
dwarf_decode_macros (cu, attr->as_unsigned (), 1);
}
else
{
attr = dwarf2_attr (die, DW_AT_macro_info, cu);
if (attr != nullptr && attr->form_is_unsigned () && cu->line_header)
{
unsigned int macro_offset = attr->as_unsigned ();
dwarf_decode_macros (cu, macro_offset, 0);
}
}
}
void
dwarf2_cu::setup_type_unit_groups (struct die_info *die)
{
struct type_unit_group *tu_group;
int first_time;
struct attribute *attr;
unsigned int i;
struct signatured_type *sig_type;
gdb_assert (per_cu->is_debug_types);
sig_type = (struct signatured_type *) per_cu;
attr = dwarf2_attr (die, DW_AT_stmt_list, this);
/* If we're using .gdb_index (includes -readnow) then
per_cu->type_unit_group may not have been set up yet. */
if (sig_type->type_unit_group == NULL)
sig_type->type_unit_group = get_type_unit_group (this, attr);
tu_group = sig_type->type_unit_group;
/* If we've already processed this stmt_list there's no real need to
do it again, we could fake it and just recreate the part we need
(file name,index -> symtab mapping). If data shows this optimization
is useful we can do it then. */
type_unit_group_unshareable *tug_unshare
= per_objfile->get_type_unit_group_unshareable (tu_group);
first_time = tug_unshare->compunit_symtab == NULL;
/* We have to handle the case of both a missing DW_AT_stmt_list or bad
debug info. */
line_header_up lh;
if (attr != NULL && attr->form_is_unsigned ())
{
sect_offset line_offset = (sect_offset) attr->as_unsigned ();
lh = dwarf_decode_line_header (line_offset, this);
}
if (lh == NULL)
{
if (first_time)
start_symtab ("", NULL, 0);
else
{
gdb_assert (tug_unshare->symtabs == NULL);
gdb_assert (m_builder == nullptr);
struct compunit_symtab *cust = tug_unshare->compunit_symtab;
m_builder.reset (new struct buildsym_compunit
(COMPUNIT_OBJFILE (cust), "",
COMPUNIT_DIRNAME (cust),
compunit_language (cust),
0, cust));
list_in_scope = get_builder ()->get_file_symbols ();
}
return;
}
line_header = lh.release ();
line_header_die_owner = die;
if (first_time)
{
struct compunit_symtab *cust = start_symtab ("", NULL, 0);
/* Note: We don't assign tu_group->compunit_symtab yet because we're
still initializing it, and our caller (a few levels up)
process_full_type_unit still needs to know if this is the first
time. */
tug_unshare->symtabs
= XOBNEWVEC (&COMPUNIT_OBJFILE (cust)->objfile_obstack,
struct symtab *, line_header->file_names_size ());
auto &file_names = line_header->file_names ();
for (i = 0; i < file_names.size (); ++i)
{
file_entry &fe = file_names[i];
dwarf2_start_subfile (this, fe.name,
fe.include_dir (line_header));
buildsym_compunit *b = get_builder ();
if (b->get_current_subfile ()->symtab == NULL)
{
/* NOTE: start_subfile will recognize when it's been
passed a file it has already seen. So we can't
assume there's a simple mapping from
cu->line_header->file_names to subfiles, plus
cu->line_header->file_names may contain dups. */
b->get_current_subfile ()->symtab
= allocate_symtab (cust, b->get_current_subfile ()->name);
}
fe.symtab = b->get_current_subfile ()->symtab;
tug_unshare->symtabs[i] = fe.symtab;
}
}
else
{
gdb_assert (m_builder == nullptr);
struct compunit_symtab *cust = tug_unshare->compunit_symtab;
m_builder.reset (new struct buildsym_compunit
(COMPUNIT_OBJFILE (cust), "",
COMPUNIT_DIRNAME (cust),
compunit_language (cust),
0, cust));
list_in_scope = get_builder ()->get_file_symbols ();
auto &file_names = line_header->file_names ();
for (i = 0; i < file_names.size (); ++i)
{
file_entry &fe = file_names[i];
fe.symtab = tug_unshare->symtabs[i];
}
}
/* The main symtab is allocated last. Type units don't have DW_AT_name
so they don't have a "real" (so to speak) symtab anyway.
There is later code that will assign the main symtab to all symbols
that don't have one. We need to handle the case of a symbol with a
missing symtab (DW_AT_decl_file) anyway. */
}
/* Process DW_TAG_type_unit.
For TUs we want to skip the first top level sibling if it's not the
actual type being defined by this TU. In this case the first top
level sibling is there to provide context only. */
static void
read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
{
struct die_info *child_die;
prepare_one_comp_unit (cu, die, language_minimal);
/* Initialize (or reinitialize) the machinery for building symtabs.
We do this before processing child DIEs, so that the line header table
is available for DW_AT_decl_file. */
cu->setup_type_unit_groups (die);
if (die->child != NULL)
{
child_die = die->child;
while (child_die && child_die->tag)
{
process_die (child_die, cu);
child_die = child_die->sibling;
}
}
}
/* DWO/DWP files.
http://gcc.gnu.org/wiki/DebugFission
http://gcc.gnu.org/wiki/DebugFissionDWP
To simplify handling of both DWO files ("object" files with the DWARF info)
and DWP files (a file with the DWOs packaged up into one file), we treat
DWP files as having a collection of virtual DWO files. */
static hashval_t
hash_dwo_file (const void *item)
{
const struct dwo_file *dwo_file = (const struct dwo_file *) item;
hashval_t hash;
hash = htab_hash_string (dwo_file->dwo_name);
if (dwo_file->comp_dir != NULL)
hash += htab_hash_string (dwo_file->comp_dir);
return hash;
}
static int
eq_dwo_file (const void *item_lhs, const void *item_rhs)
{
const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
return 0;
if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
return lhs->comp_dir == rhs->comp_dir;
return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
}
/* Allocate a hash table for DWO files. */
static htab_up
allocate_dwo_file_hash_table ()
{
return htab_up (htab_create_alloc (41,
hash_dwo_file,
eq_dwo_file,
htab_delete_entry<dwo_file>,
xcalloc, xfree));
}
/* Lookup DWO file DWO_NAME. */
static void **
lookup_dwo_file_slot (dwarf2_per_objfile *per_objfile,
const char *dwo_name,
const char *comp_dir)
{
struct dwo_file find_entry;
void **slot;
if (per_objfile->per_bfd->dwo_files == NULL)
per_objfile->per_bfd->dwo_files = allocate_dwo_file_hash_table ();
find_entry.dwo_name = dwo_name;
find_entry.comp_dir = comp_dir;
slot = htab_find_slot (per_objfile->per_bfd->dwo_files.get (), &find_entry,
INSERT);
return slot;
}
static hashval_t
hash_dwo_unit (const void *item)
{
const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
/* This drops the top 32 bits of the id, but is ok for a hash. */
return dwo_unit->signature;
}
static int
eq_dwo_unit (const void *item_lhs, const void *item_rhs)
{
const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
/* The signature is assumed to be unique within the DWO file.
So while object file CU dwo_id's always have the value zero,
that's OK, assuming each object file DWO file has only one CU,
and that's the rule for now. */
return lhs->signature == rhs->signature;
}
/* Allocate a hash table for DWO CUs,TUs.
There is one of these tables for each of CUs,TUs for each DWO file. */
static htab_up
allocate_dwo_unit_table ()
{
/* Start out with a pretty small number.
Generally DWO files contain only one CU and maybe some TUs. */
return htab_up (htab_create_alloc (3,
hash_dwo_unit,
eq_dwo_unit,
NULL, xcalloc, xfree));
}
/* die_reader_func for create_dwo_cu. */
static void
create_dwo_cu_reader (const struct die_reader_specs *reader,
const gdb_byte *info_ptr,
struct die_info *comp_unit_die,
struct dwo_file *dwo_file,
struct dwo_unit *dwo_unit)
{
struct dwarf2_cu *cu = reader->cu;
sect_offset sect_off = cu->per_cu->sect_off;
struct dwarf2_section_info *section = cu->per_cu->section;
gdb::optional<ULONGEST> signature = lookup_dwo_id (cu, comp_unit_die);
if (!signature.has_value ())
{
complaint (_("Dwarf Error: debug entry at offset %s is missing"
" its dwo_id [in module %s]"),
sect_offset_str (sect_off), dwo_file->dwo_name);
return;
}
dwo_unit->dwo_file = dwo_file;
dwo_unit->signature = *signature;
dwo_unit->section = section;
dwo_unit->sect_off = sect_off;
dwo_unit->length = cu->per_cu->length;
dwarf_read_debug_printf (" offset %s, dwo_id %s",
sect_offset_str (sect_off),
hex_string (dwo_unit->signature));
}
/* Create the dwo_units for the CUs in a DWO_FILE.
Note: This function processes DWO files only, not DWP files. */
static void
create_cus_hash_table (dwarf2_per_objfile *per_objfile,
dwarf2_cu *cu, struct dwo_file &dwo_file,
dwarf2_section_info &section, htab_up &cus_htab)
{
struct objfile *objfile = per_objfile->objfile;
dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
const gdb_byte *info_ptr, *end_ptr;
section.read (objfile);
info_ptr = section.buffer;
if (info_ptr == NULL)
return;
dwarf_read_debug_printf ("Reading %s for %s:",
section.get_name (),
section.get_file_name ());
end_ptr = info_ptr + section.size;
while (info_ptr < end_ptr)
{
struct dwarf2_per_cu_data per_cu;
struct dwo_unit read_unit {};
struct dwo_unit *dwo_unit;
void **slot;
sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
per_cu.per_bfd = per_bfd;
per_cu.is_debug_types = 0;
per_cu.sect_off = sect_offset (info_ptr - section.buffer);
per_cu.section = &section;
cutu_reader reader (&per_cu, per_objfile, cu, &dwo_file);
if (!reader.dummy_p)
create_dwo_cu_reader (&reader, reader.info_ptr, reader.comp_unit_die,
&dwo_file, &read_unit);
info_ptr += per_cu.length;
// If the unit could not be parsed, skip it.
if (read_unit.dwo_file == NULL)
continue;
if (cus_htab == NULL)
cus_htab = allocate_dwo_unit_table ();
dwo_unit = OBSTACK_ZALLOC (&per_bfd->obstack,
struct dwo_unit);
*dwo_unit = read_unit;
slot = htab_find_slot (cus_htab.get (), dwo_unit, INSERT);
gdb_assert (slot != NULL);
if (*slot != NULL)
{
const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
sect_offset dup_sect_off = dup_cu->sect_off;
complaint (_("debug cu entry at offset %s is duplicate to"
" the entry at offset %s, signature %s"),
sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
hex_string (dwo_unit->signature));
}
*slot = (void *)dwo_unit;
}
}
/* DWP file .debug_{cu,tu}_index section format:
[ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
[ref: http://dwarfstd.org/doc/DWARF5.pdf, sect 7.3.5 "DWARF Package Files"]
DWP Versions 1 & 2 are older, pre-standard format versions. The first
officially standard DWP format was published with DWARF v5 and is called
Version 5. There are no versions 3 or 4.
DWP Version 1:
Both index sections have the same format, and serve to map a 64-bit
signature to a set of section numbers. Each section begins with a header,
followed by a hash table of 64-bit signatures, a parallel table of 32-bit
indexes, and a pool of 32-bit section numbers. The index sections will be
aligned at 8-byte boundaries in the file.
The index section header consists of:
V, 32 bit version number
-, 32 bits unused
N, 32 bit number of compilation units or type units in the index
M, 32 bit number of slots in the hash table
Numbers are recorded using the byte order of the application binary.
The hash table begins at offset 16 in the section, and consists of an array
of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
order of the application binary). Unused slots in the hash table are 0.
(We rely on the extreme unlikeliness of a signature being exactly 0.)
The parallel table begins immediately after the hash table
(at offset 16 + 8 * M from the beginning of the section), and consists of an
array of 32-bit indexes (using the byte order of the application binary),
corresponding 1-1 with slots in the hash table. Each entry in the parallel
table contains a 32-bit index into the pool of section numbers. For unused
hash table slots, the corresponding entry in the parallel table will be 0.
The pool of section numbers begins immediately following the hash table
(at offset 16 + 12 * M from the beginning of the section). The pool of
section numbers consists of an array of 32-bit words (using the byte order
of the application binary). Each item in the array is indexed starting
from 0. The hash table entry provides the index of the first section
number in the set. Additional section numbers in the set follow, and the
set is terminated by a 0 entry (section number 0 is not used in ELF).
In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
section must be the first entry in the set, and the .debug_abbrev.dwo must
be the second entry. Other members of the set may follow in any order.
---
DWP Versions 2 and 5:
DWP Versions 2 and 5 combine all the .debug_info, etc. sections into one,
and the entries in the index tables are now offsets into these sections.
CU offsets begin at 0. TU offsets begin at the size of the .debug_info
section.
Index Section Contents:
Header
Hash Table of Signatures dwp_hash_table.hash_table
Parallel Table of Indices dwp_hash_table.unit_table
Table of Section Offsets dwp_hash_table.{v2|v5}.{section_ids,offsets}
Table of Section Sizes dwp_hash_table.{v2|v5}.sizes
The index section header consists of:
V, 32 bit version number
L, 32 bit number of columns in the table of section offsets
N, 32 bit number of compilation units or type units in the index
M, 32 bit number of slots in the hash table
Numbers are recorded using the byte order of the application binary.
The hash table has the same format as version 1.
The parallel table of indices has the same format as version 1,
except that the entries are origin-1 indices into the table of sections
offsets and the table of section sizes.
The table of offsets begins immediately following the parallel table
(at offset 16 + 12 * M from the beginning of the section). The table is
a two-dimensional array of 32-bit words (using the byte order of the
application binary), with L columns and N+1 rows, in row-major order.
Each row in the array is indexed starting from 0. The first row provides
a key to the remaining rows: each column in this row provides an identifier
for a debug section, and the offsets in the same column of subsequent rows
refer to that section. The section identifiers for Version 2 are:
DW_SECT_INFO 1 .debug_info.dwo
DW_SECT_TYPES 2 .debug_types.dwo
DW_SECT_ABBREV 3 .debug_abbrev.dwo
DW_SECT_LINE 4 .debug_line.dwo
DW_SECT_LOC 5 .debug_loc.dwo
DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
DW_SECT_MACINFO 7 .debug_macinfo.dwo
DW_SECT_MACRO 8 .debug_macro.dwo
The section identifiers for Version 5 are:
DW_SECT_INFO_V5 1 .debug_info.dwo
DW_SECT_RESERVED_V5 2 --
DW_SECT_ABBREV_V5 3 .debug_abbrev.dwo
DW_SECT_LINE_V5 4 .debug_line.dwo
DW_SECT_LOCLISTS_V5 5 .debug_loclists.dwo
DW_SECT_STR_OFFSETS_V5 6 .debug_str_offsets.dwo
DW_SECT_MACRO_V5 7 .debug_macro.dwo
DW_SECT_RNGLISTS_V5 8 .debug_rnglists.dwo
The offsets provided by the CU and TU index sections are the base offsets
for the contributions made by each CU or TU to the corresponding section
in the package file. Each CU and TU header contains an abbrev_offset
field, used to find the abbreviations table for that CU or TU within the
contribution to the .debug_abbrev.dwo section for that CU or TU, and should
be interpreted as relative to the base offset given in the index section.
Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
should be interpreted as relative to the base offset for .debug_line.dwo,
and offsets into other debug sections obtained from DWARF attributes should
also be interpreted as relative to the corresponding base offset.
The table of sizes begins immediately following the table of offsets.
Like the table of offsets, it is a two-dimensional array of 32-bit words,
with L columns and N rows, in row-major order. Each row in the array is
indexed starting from 1 (row 0 is shared by the two tables).
---
Hash table lookup is handled the same in version 1 and 2:
We assume that N and M will not exceed 2^32 - 1.
The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
Given a 64-bit compilation unit signature or a type signature S, an entry
in the hash table is located as follows:
1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
the low-order k bits all set to 1.
2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
3) If the hash table entry at index H matches the signature, use that
entry. If the hash table entry at index H is unused (all zeroes),
terminate the search: the signature is not present in the table.
4) Let H = (H + H') modulo M. Repeat at Step 3.
Because M > N and H' and M are relatively prime, the search is guaranteed
to stop at an unused slot or find the match. */
/* Create a hash table to map DWO IDs to their CU/TU entry in
.debug_{info,types}.dwo in DWP_FILE.
Returns NULL if there isn't one.
Note: This function processes DWP files only, not DWO files. */
static struct dwp_hash_table *
create_dwp_hash_table (dwarf2_per_objfile *per_objfile,
struct dwp_file *dwp_file, int is_debug_types)
{
struct objfile *objfile = per_objfile->objfile;
bfd *dbfd = dwp_file->dbfd.get ();
const gdb_byte *index_ptr, *index_end;
struct dwarf2_section_info *index;
uint32_t version, nr_columns, nr_units, nr_slots;
struct dwp_hash_table *htab;
if (is_debug_types)
index = &dwp_file->sections.tu_index;
else
index = &dwp_file->sections.cu_index;
if (index->empty ())
return NULL;
index->read (objfile);
index_ptr = index->buffer;
index_end = index_ptr + index->size;
/* For Version 5, the version is really 2 bytes of data & 2 bytes of padding.
For now it's safe to just read 4 bytes (particularly as it's difficult to
tell if you're dealing with Version 5 before you've read the version). */
version = read_4_bytes (dbfd, index_ptr);
index_ptr += 4;
if (version == 2 || version == 5)
nr_columns = read_4_bytes (dbfd, index_ptr);
else
nr_columns = 0;
index_ptr += 4;
nr_units = read_4_bytes (dbfd, index_ptr);
index_ptr += 4;
nr_slots = read_4_bytes (dbfd, index_ptr);
index_ptr += 4;
if (version != 1 && version != 2 && version != 5)
{
error (_("Dwarf Error: unsupported DWP file version (%s)"
" [in module %s]"),
pulongest (version), dwp_file->name);
}
if (nr_slots != (nr_slots & -nr_slots))
{
error (_("Dwarf Error: number of slots in DWP hash table (%s)"
" is not power of 2 [in module %s]"),
pulongest (nr_slots), dwp_file->name);
}
htab = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, struct dwp_hash_table);
htab->version = version;
htab->nr_columns = nr_columns;
htab->nr_units = nr_units;
htab->nr_slots = nr_slots;
htab->hash_table = index_ptr;
htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
/* Exit early if the table is empty. */
if (nr_slots == 0 || nr_units == 0
|| (version == 2 && nr_columns == 0)
|| (version == 5 && nr_columns == 0))
{
/* All must be zero. */
if (nr_slots != 0 || nr_units != 0
|| (version == 2 && nr_columns != 0)
|| (version == 5 && nr_columns != 0))
{
complaint (_("Empty DWP but nr_slots,nr_units,nr_columns not"
" all zero [in modules %s]"),
dwp_file->name);
}
return htab;
}
if (version == 1)
{
htab->section_pool.v1.indices =
htab->unit_table + sizeof (uint32_t) * nr_slots;
/* It's harder to decide whether the section is too small in v1.
V1 is deprecated anyway so we punt. */
}
else if (version == 2)
{
const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
int *ids = htab->section_pool.v2.section_ids;
size_t sizeof_ids = sizeof (htab->section_pool.v2.section_ids);
/* Reverse map for error checking. */
int ids_seen[DW_SECT_MAX + 1];
int i;
if (nr_columns < 2)
{
error (_("Dwarf Error: bad DWP hash table, too few columns"
" in section table [in module %s]"),
dwp_file->name);
}
if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
{
error (_("Dwarf Error: bad DWP hash table, too many columns"
" in section table [in module %s]"),
dwp_file->name);
}
memset (ids, 255, sizeof_ids);
memset (ids_seen, 255, sizeof (ids_seen));
for (i = 0; i < nr_columns; ++i)
{
int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
if (id < DW_SECT_MIN || id > DW_SECT_MAX)
{
error (_("Dwarf Error: bad DWP hash table, bad section id %d"
" in section table [in module %s]"),
id, dwp_file->name);
}
if (ids_seen[id] != -1)
{
error (_("Dwarf Error: bad DWP hash table, duplicate section"
" id %d in section table [in module %s]"),
id, dwp_file->name);
}
ids_seen[id] = i;
ids[i] = id;
}
/* Must have exactly one info or types section. */
if (((ids_seen[DW_SECT_INFO] != -1)
+ (ids_seen[DW_SECT_TYPES] != -1))
!= 1)
{
error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
" DWO info/types section [in module %s]"),
dwp_file->name);
}
/* Must have an abbrev section. */
if (ids_seen[DW_SECT_ABBREV] == -1)
{
error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
" section [in module %s]"),
dwp_file->name);
}
htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
htab->section_pool.v2.sizes =
htab->section_pool.v2.offsets + (sizeof (uint32_t)
* nr_units * nr_columns);
if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
* nr_units * nr_columns))
> index_end)
{
error (_("Dwarf Error: DWP index section is corrupt (too small)"
" [in module %s]"),
dwp_file->name);
}
}
else /* version == 5 */
{
const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
int *ids = htab->section_pool.v5.section_ids;
size_t sizeof_ids = sizeof (htab->section_pool.v5.section_ids);
/* Reverse map for error checking. */
int ids_seen[DW_SECT_MAX_V5 + 1];
if (nr_columns < 2)
{
error (_("Dwarf Error: bad DWP hash table, too few columns"
" in section table [in module %s]"),
dwp_file->name);
}
if (nr_columns > MAX_NR_V5_DWO_SECTIONS)
{
error (_("Dwarf Error: bad DWP hash table, too many columns"
" in section table [in module %s]"),
dwp_file->name);
}
memset (ids, 255, sizeof_ids);
memset (ids_seen, 255, sizeof (ids_seen));
for (int i = 0; i < nr_columns; ++i)
{
int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
if (id < DW_SECT_MIN || id > DW_SECT_MAX_V5)
{
error (_("Dwarf Error: bad DWP hash table, bad section id %d"
" in section table [in module %s]"),
id, dwp_file->name);
}
if (ids_seen[id] != -1)
{
error (_("Dwarf Error: bad DWP hash table, duplicate section"
" id %d in section table [in module %s]"),
id, dwp_file->name);
}
ids_seen[id] = i;
ids[i] = id;
}
/* Must have seen an info section. */
if (ids_seen[DW_SECT_INFO_V5] == -1)
{
error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
" DWO info/types section [in module %s]"),
dwp_file->name);
}
/* Must have an abbrev section. */
if (ids_seen[DW_SECT_ABBREV_V5] == -1)
{
error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
" section [in module %s]"),
dwp_file->name);
}
htab->section_pool.v5.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
htab->section_pool.v5.sizes
= htab->section_pool.v5.offsets + (sizeof (uint32_t)
* nr_units * nr_columns);
if ((htab->section_pool.v5.sizes + (sizeof (uint32_t)
* nr_units * nr_columns))
> index_end)
{
error (_("Dwarf Error: DWP index section is corrupt (too small)"
" [in module %s]"),
dwp_file->name);
}
}
return htab;
}
/* Update SECTIONS with the data from SECTP.
This function is like the other "locate" section routines, but in
this context the sections to read comes from the DWP V1 hash table,
not the full ELF section table.
The result is non-zero for success, or zero if an error was found. */
static int
locate_v1_virtual_dwo_sections (asection *sectp,
struct virtual_v1_dwo_sections *sections)
{
const struct dwop_section_names *names = &dwop_section_names;
if (names->abbrev_dwo.matches (sectp->name))
{
/* There can be only one. */
if (sections->abbrev.s.section != NULL)
return 0;
sections->abbrev.s.section = sectp;
sections->abbrev.size = bfd_section_size (sectp);
}
else if (names->info_dwo.matches (sectp->name)
|| names->types_dwo.matches (sectp->name))
{
/* There can be only one. */
if (sections->info_or_types.s.section != NULL)
return 0;
sections->info_or_types.s.section = sectp;
sections->info_or_types.size = bfd_section_size (sectp);
}
else if (names->line_dwo.matches (sectp->name))
{
/* There can be only one. */
if (sections->line.s.section != NULL)
return 0;
sections->line.s.section = sectp;
sections->line.size = bfd_section_size (sectp);
}
else if (names->loc_dwo.matches (sectp->name))
{
/* There can be only one. */
if (sections->loc.s.section != NULL)
return 0;
sections->loc.s.section = sectp;
sections->loc.size = bfd_section_size (sectp);
}
else if (names->macinfo_dwo.matches (sectp->name))
{
/* There can be only one. */
if (sections->macinfo.s.section != NULL)
return 0;
sections->macinfo.s.section = sectp;
sections->macinfo.size = bfd_section_size (sectp);
}
else if (names->macro_dwo.matches (sectp->name))
{
/* There can be only one. */
if (sections->macro.s.section != NULL)
return 0;
sections->macro.s.section = sectp;
sections->macro.size = bfd_section_size (sectp);
}
else if (names->str_offsets_dwo.matches (sectp->name))
{
/* There can be only one. */
if (sections->str_offsets.s.section != NULL)
return 0;
sections->str_offsets.s.section = sectp;
sections->str_offsets.size = bfd_section_size (sectp);
}
else
{
/* No other kind of section is valid. */
return 0;
}
return 1;
}
/* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
UNIT_INDEX is the index of the DWO unit in the DWP hash table.
COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
This is for DWP version 1 files. */
static struct dwo_unit *
create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile *per_objfile,
struct dwp_file *dwp_file,
uint32_t unit_index,
const char *comp_dir,
ULONGEST signature, int is_debug_types)
{
const struct dwp_hash_table *dwp_htab =
is_debug_types ? dwp_file->tus : dwp_file->cus;
bfd *dbfd = dwp_file->dbfd.get ();
const char *kind = is_debug_types ? "TU" : "CU";
struct dwo_file *dwo_file;
struct dwo_unit *dwo_unit;
struct virtual_v1_dwo_sections sections;
void **dwo_file_slot;
int i;
gdb_assert (dwp_file->version == 1);
dwarf_read_debug_printf ("Reading %s %s/%s in DWP V1 file: %s",
kind, pulongest (unit_index), hex_string (signature),
dwp_file->name);
/* Fetch the sections of this DWO unit.
Put a limit on the number of sections we look for so that bad data
doesn't cause us to loop forever. */
#define MAX_NR_V1_DWO_SECTIONS \
(1 /* .debug_info or .debug_types */ \
+ 1 /* .debug_abbrev */ \
+ 1 /* .debug_line */ \
+ 1 /* .debug_loc */ \
+ 1 /* .debug_str_offsets */ \
+ 1 /* .debug_macro or .debug_macinfo */ \
+ 1 /* trailing zero */)
memset (&sections, 0, sizeof (sections));
for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
{
asection *sectp;
uint32_t section_nr =
read_4_bytes (dbfd,
dwp_htab->section_pool.v1.indices
+ (unit_index + i) * sizeof (uint32_t));
if (section_nr == 0)
break;
if (section_nr >= dwp_file->num_sections)
{
error (_("Dwarf Error: bad DWP hash table, section number too large"
" [in module %s]"),
dwp_file->name);
}
sectp = dwp_file->elf_sections[section_nr];
if (! locate_v1_virtual_dwo_sections (sectp, &sections))
{
error (_("Dwarf Error: bad DWP hash table, invalid section found"
" [in module %s]"),
dwp_file->name);
}
}
if (i < 2
|| sections.info_or_types.empty ()
|| sections.abbrev.empty ())
{
error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
" [in module %s]"),
dwp_file->name);
}
if (i == MAX_NR_V1_DWO_SECTIONS)
{
error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
" [in module %s]"),
dwp_file->name);
}
/* It's easier for the rest of the code if we fake a struct dwo_file and
have dwo_unit "live" in that. At least for now.
The DWP file can be made up of a random collection of CUs and TUs.
However, for each CU + set of TUs that came from the same original DWO
file, we can combine them back into a virtual DWO file to save space
(fewer struct dwo_file objects to allocate). Remember that for really
large apps there can be on the order of 8K CUs and 200K TUs, or more. */
std::string virtual_dwo_name =
string_printf ("virtual-dwo/%d-%d-%d-%d",
sections.abbrev.get_id (),
sections.line.get_id (),
sections.loc.get_id (),
sections.str_offsets.get_id ());
/* Can we use an existing virtual DWO file? */
dwo_file_slot = lookup_dwo_file_slot (per_objfile, virtual_dwo_name.c_str (),
comp_dir);
/* Create one if necessary. */
if (*dwo_file_slot == NULL)
{
dwarf_read_debug_printf ("Creating virtual DWO: %s",
virtual_dwo_name.c_str ());
dwo_file = new struct dwo_file;
dwo_file->dwo_name = per_objfile->objfile->intern (virtual_dwo_name);
dwo_file->comp_dir = comp_dir;
dwo_file->sections.abbrev = sections.abbrev;
dwo_file->sections.line = sections.line;
dwo_file->sections.loc = sections.loc;
dwo_file->sections.macinfo = sections.macinfo;
dwo_file->sections.macro = sections.macro;
dwo_file->sections.str_offsets = sections.str_offsets;
/* The "str" section is global to the entire DWP file. */
dwo_file->sections.str = dwp_file->sections.str;
/* The info or types section is assigned below to dwo_unit,
there's no need to record it in dwo_file.
Also, we can't simply record type sections in dwo_file because
we record a pointer into the vector in dwo_unit. As we collect more
types we'll grow the vector and eventually have to reallocate space
for it, invalidating all copies of pointers into the previous
contents. */
*dwo_file_slot = dwo_file;
}
else
{
dwarf_read_debug_printf ("Using existing virtual DWO: %s",
virtual_dwo_name.c_str ());
dwo_file = (struct dwo_file *) *dwo_file_slot;
}
dwo_unit = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, struct dwo_unit);
dwo_unit->dwo_file = dwo_file;
dwo_unit->signature = signature;
dwo_unit->section =
XOBNEW (&per_objfile->per_bfd->obstack, struct dwarf2_section_info);
*dwo_unit->section = sections.info_or_types;
/* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
return dwo_unit;
}
/* Subroutine of create_dwo_unit_in_dwp_v2 and create_dwo_unit_in_dwp_v5 to
simplify them. Given a pointer to the containing section SECTION, and
OFFSET,SIZE of the piece within that section used by a TU/CU, return a
virtual section of just that piece. */
static struct dwarf2_section_info
create_dwp_v2_or_v5_section (dwarf2_per_objfile *per_objfile,
struct dwarf2_section_info *section,
bfd_size_type offset, bfd_size_type size)
{
struct dwarf2_section_info result;
asection *sectp;
gdb_assert (section != NULL);
gdb_assert (!section->is_virtual);
memset (&result, 0, sizeof (result));
result.s.containing_section = section;
result.is_virtual = true;
if (size == 0)
return result;
sectp = section->get_bfd_section ();
/* Flag an error if the piece denoted by OFFSET,SIZE is outside the
bounds of the real section. This is a pretty-rare event, so just
flag an error (easier) instead of a warning and trying to cope. */
if (sectp == NULL
|| offset + size > bfd_section_size (sectp))
{
error (_("Dwarf Error: Bad DWP V2 or V5 section info, doesn't fit"
" in section %s [in module %s]"),
sectp ? bfd_section_name (sectp) : "<unknown>",
objfile_name (per_objfile->objfile));
}
result.virtual_offset = offset;
result.size = size;
return result;
}
/* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
UNIT_INDEX is the index of the DWO unit in the DWP hash table.
COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
This is for DWP version 2 files. */
static struct dwo_unit *
create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile *per_objfile,
struct dwp_file *dwp_file,
uint32_t unit_index,
const char *comp_dir,
ULONGEST signature, int is_debug_types)
{
const struct dwp_hash_table *dwp_htab =
is_debug_types ? dwp_file->tus : dwp_file->cus;
bfd *dbfd = dwp_file->dbfd.get ();
const char *kind = is_debug_types ? "TU" : "CU";
struct dwo_file *dwo_file;
struct dwo_unit *dwo_unit;
struct virtual_v2_or_v5_dwo_sections sections;
void **dwo_file_slot;
int i;
gdb_assert (dwp_file->version == 2);
dwarf_read_debug_printf ("Reading %s %s/%s in DWP V2 file: %s",
kind, pulongest (unit_index), hex_string (signature),
dwp_file->name);
/* Fetch the section offsets of this DWO unit. */
memset (&sections, 0, sizeof (sections));
for (i = 0; i < dwp_htab->nr_columns; ++i)
{
uint32_t offset = read_4_bytes (dbfd,
dwp_htab->section_pool.v2.offsets
+ (((unit_index - 1) * dwp_htab->nr_columns
+ i)
* sizeof (uint32_t)));
uint32_t size = read_4_bytes (dbfd,
dwp_htab->section_pool.v2.sizes
+ (((unit_index - 1) * dwp_htab->nr_columns
+ i)
* sizeof (uint32_t)));
switch (dwp_htab->section_pool.v2.section_ids[i])
{
case DW_SECT_INFO:
case DW_SECT_TYPES:
sections.info_or_types_offset = offset;
sections.info_or_types_size = size;
break;
case DW_SECT_ABBREV:
sections.abbrev_offset = offset;
sections.abbrev_size = size;
break;
case DW_SECT_LINE:
sections.line_offset = offset;
sections.line_size = size;
break;
case DW_SECT_LOC:
sections.loc_offset = offset;
sections.loc_size = size;
break;
case DW_SECT_STR_OFFSETS:
sections.str_offsets_offset = offset;
sections.str_offsets_size = size;
break;
case DW_SECT_MACINFO:
sections.macinfo_offset = offset;
sections.macinfo_size = size;
break;
case DW_SECT_MACRO:
sections.macro_offset = offset;
sections.macro_size = size;
break;
}
}
/* It's easier for the rest of the code if we fake a struct dwo_file and
have dwo_unit "live" in that. At least for now.
The DWP file can be made up of a random collection of CUs and TUs.
However, for each CU + set of TUs that came from the same original DWO
file, we can combine them back into a virtual DWO file to save space
(fewer struct dwo_file objects to allocate). Remember that for really
large apps there can be on the order of 8K CUs and 200K TUs, or more. */
std::string virtual_dwo_name =
string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
(long) (sections.abbrev_size ? sections.abbrev_offset : 0),
(long) (sections.line_size ? sections.line_offset : 0),
(long) (sections.loc_size ? sections.loc_offset : 0),
(long) (sections.str_offsets_size
? sections.str_offsets_offset : 0));
/* Can we use an existing virtual DWO file? */
dwo_file_slot = lookup_dwo_file_slot (per_objfile, virtual_dwo_name.c_str (),
comp_dir);
/* Create one if necessary. */
if (*dwo_file_slot == NULL)
{
dwarf_read_debug_printf ("Creating virtual DWO: %s",
virtual_dwo_name.c_str ());
dwo_file = new struct dwo_file;
dwo_file->dwo_name = per_objfile->objfile->intern (virtual_dwo_name);
dwo_file->comp_dir = comp_dir;
dwo_file->sections.abbrev =
create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.abbrev,
sections.abbrev_offset,
sections.abbrev_size);
dwo_file->sections.line =
create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.line,
sections.line_offset,
sections.line_size);
dwo_file->sections.loc =
create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.loc,
sections.loc_offset, sections.loc_size);
dwo_file->sections.macinfo =
create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.macinfo,
sections.macinfo_offset,
sections.macinfo_size);
dwo_file->sections.macro =
create_dwp_v2_or_v5_section (per_objfile, &dwp_file->sections.macro,
sections.macro_offset,
sections.macro_size);
dwo_file->sections.str_offsets =
create_dwp_v2_or_v5_section (per_objfile,
&dwp_file->sections.str_offsets,
sections.str_offsets_offset,
sections.str_offsets_size);
/* The "str" section is global to the entire DWP file. */
dwo_file->sections.str = dwp_file->sections.str;
/* The info or types section is assigned below to dwo_unit,
there's no need to record it in dwo_file.
Also, we can't simply record type sections in dwo_file because
we record a pointer into the vector in dwo_unit. As we collect more
types we'll grow the vector and eventually have to reallocate space
for it, invalidating all copies of pointers into the previous
contents. */
*dwo_file_slot = dwo_file;
}
else
{
dwarf_read_debug_printf ("Using existing virtual DWO: %s",
virtual_dwo_name.c_str ());
dwo_file = (struct dwo_file *) *dwo_file_slot;
}
dwo_unit = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, struct dwo_unit);
dwo_unit->dwo_file = dwo_file;
dwo_unit->signature = signature;
dwo_unit->section =
XOBNEW (&per_objfile->per_bfd->obstack, struct dwarf2_section_info);
*dwo_unit->section = create_dwp_v2_or_v5_section
(per_objfile,
is_debug_types
? &dwp_file->sections.types
: &dwp_file->sections.info,
sections.info_or_types_offset,
sections.info_or_types_size);
/* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
return dwo_unit;
}
/* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
UNIT_INDEX is the index of the DWO unit in the DWP hash table.
COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
This is for DWP version 5 files. */
static struct dwo_unit *
create_dwo_unit_in_dwp_v5 (dwarf2_per_objfile *per_objfile,
struct dwp_file *dwp_file,
uint32_t unit_index,
const char *comp_dir,
ULONGEST signature, int is_debug_types)
{
const struct dwp_hash_table *dwp_htab
= is_debug_types ? dwp_file->tus : dwp_file->cus;
bfd *dbfd = dwp_file->dbfd.get ();
const char *kind = is_debug_types ? "TU" : "CU";
struct dwo_file *dwo_file;
struct dwo_unit *dwo_unit;
struct virtual_v2_or_v5_dwo_sections sections {};
void **dwo_file_slot;
gdb_assert (dwp_file->version == 5);
dwarf_read_debug_printf ("Reading %s %s/%s in DWP V5 file: %s",
kind, pulongest (unit_index), hex_string (signature),
dwp_file->name);
/* Fetch the section offsets of this DWO unit. */
/* memset (&sections, 0, sizeof (sections)); */
for (int i = 0; i < dwp_htab->nr_columns; ++i)
{
uint32_t offset = read_4_bytes (dbfd,
dwp_htab->section_pool.v5.offsets
+ (((unit_index - 1)
* dwp_htab->nr_columns
+ i)
* sizeof (uint32_t)));
uint32_t size = read_4_bytes (dbfd,
dwp_htab->section_pool.v5.sizes
+ (((unit_index - 1) * dwp_htab->nr_columns
+ i)
* sizeof (uint32_t)));
switch (dwp_htab->section_pool.v5.section_ids[i])
{
case DW_SECT_ABBREV_V5:
sections.abbrev_offset = offset;
sections.abbrev_size = size;
break;
case DW_SECT_INFO_V5:
sections.info_or_types_offset = offset;
sections.info_or_types_size = size;
break;
case DW_SECT_LINE_V5:
sections.line_offset = offset;
sections.line_size = size;
break;
case DW_SECT_LOCLISTS_V5:
sections.loclists_offset = offset;
sections.loclists_size = size;
break;
case DW_SECT_MACRO_V5:
sections.macro_offset = offset;
sections.macro_size = size;
break;
case DW_SECT_RNGLISTS_V5:
sections.rnglists_offset = offset;
sections.rnglists_size = size;
break;
case DW_SECT_STR_OFFSETS_V5:
sections.str_offsets_offset = offset;
sections.str_offsets_size = size;
break;
case DW_SECT_RESERVED_V5:
default:
break;
}
}
/* It's easier for the rest of the code if we fake a struct dwo_file and
have dwo_unit "live" in that. At least for now.
The DWP file can be made up of a random collection of CUs and TUs.
However, for each CU + set of TUs that came from the same original DWO
file, we can combine them back into a virtual DWO file to save space
(fewer struct dwo_file objects to allocate). Remember that for really
large apps there can be on the order of 8K CUs and 200K TUs, or more. */
std::string virtual_dwo_name =
string_printf ("virtual-dwo/%ld-%ld-%ld-%ld-%ld-%ld",
(long) (sections.abbrev_size ? sections.abbrev_offset : 0),
(long) (sections.line_size ? sections.line_offset : 0),
(long) (sections.loclists_size ? sections.loclists_offset : 0),
(long) (sections.str_offsets_size
? sections.str_offsets_offset : 0),
(long) (sections.macro_size ? sections.macro_offset : 0),
(long) (sections.rnglists_size ? sections.rnglists_offset: 0));
/* Can we use an existing virtual DWO file? */
dwo_file_slot = lookup_dwo_file_slot (per_objfile,
virtual_dwo_name.c_str (),
comp_dir);
/* Create one if necessary. */
if (*dwo_file_slot == NULL)
{
dwarf_read_debug_printf ("Creating virtual DWO: %s",
virtual_dwo_name.c_str ());
dwo_file = new struct dwo_file;
dwo_file->dwo_name = per_objfile->objfile->intern (virtual_dwo_name);
dwo_file->comp_dir = comp_dir;
dwo_file->sections.abbrev =
create_dwp_v2_or_v5_section (per_objfile,
&dwp_file->sections.abbrev,
sections.abbrev_offset,
sections.abbrev_size);
dwo_file->sections.line =
create_dwp_v2_or_v5_section (per_objfile,
&dwp_file->sections.line,
sections.line_offset, sections.line_size);
dwo_file->sections.macro =
create_dwp_v2_or_v5_section (per_objfile,
&dwp_file->sections.macro,
sections.macro_offset,
sections.macro_size);
dwo_file->sections.loclists =
create_dwp_v2_or_v5_section (per_objfile,
&dwp_file->sections.loclists,
sections.loclists_offset,
sections.loclists_size);
dwo_file->sections.rnglists =
create_dwp_v2_or_v5_section (per_objfile,
&dwp_file->sections.rnglists,
sections.rnglists_offset,
sections.rnglists_size);
dwo_file->sections.str_offsets =
create_dwp_v2_or_v5_section (per_objfile,
&dwp_file->sections.str_offsets,
sections.str_offsets_offset,
sections.str_offsets_size);
/* The "str" section is global to the entire DWP file. */
dwo_file->sections.str = dwp_file->sections.str;
/* The info or types section is assigned below to dwo_unit,
there's no need to record it in dwo_file.
Also, we can't simply record type sections in dwo_file because
we record a pointer into the vector in dwo_unit. As we collect more
types we'll grow the vector and eventually have to reallocate space
for it, invalidating all copies of pointers into the previous
contents. */
*dwo_file_slot = dwo_file;
}
else
{
dwarf_read_debug_printf ("Using existing virtual DWO: %s",
virtual_dwo_name.c_str ());
dwo_file = (struct dwo_file *) *dwo_file_slot;
}
dwo_unit = OBSTACK_ZALLOC (&per_objfile->per_bfd->obstack, struct dwo_unit);
dwo_unit->dwo_file = dwo_file;
dwo_unit->signature = signature;
dwo_unit->section
= XOBNEW (&per_objfile->per_bfd->obstack, struct dwarf2_section_info);
*dwo_unit->section = create_dwp_v2_or_v5_section (per_objfile,
&dwp_file->sections.info,
sections.info_or_types_offset,
sections.info_or_types_size);
/* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
return dwo_unit;
}
/* Lookup the DWO unit with SIGNATURE in DWP_FILE.
Returns NULL if the signature isn't found. */
static struct dwo_unit *
lookup_dwo_unit_in_dwp (dwarf2_per_objfile *per_objfile,
struct dwp_file *dwp_file, const char *comp_dir,
ULONGEST signature, int is_debug_types)
{
const struct dwp_hash_table *dwp_htab =
is_debug_types ? dwp_file->tus : dwp_file->cus;
bfd *dbfd = dwp_file->dbfd.get ();
uint32_t mask = dwp_htab->nr_slots - 1;
uint32_t hash = signature & mask;
uint32_t hash2 = ((signature >> 32) & mask) | 1;
unsigned int i;
void **slot;
struct dwo_unit find_dwo_cu;
memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
find_dwo_cu.signature = signature;
slot = htab_find_slot (is_debug_types
? dwp_file->loaded_tus.get ()
: dwp_file->loaded_cus.get (),
&find_dwo_cu, INSERT);
if (*slot != NULL)
return (struct dwo_unit *) *slot;
/* Use a for loop so that we don't loop forever on bad debug info. */
for (i = 0; i < dwp_htab->nr_slots; ++i)
{
ULONGEST signature_in_table;
signature_in_table =
read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
if (signature_in_table == signature)
{
uint32_t unit_index =
read_4_bytes (dbfd,
dwp_htab->unit_table + hash * sizeof (uint32_t));
if (dwp_file->version == 1)
{
*slot = create_dwo_unit_in_dwp_v1 (per_objfile, dwp_file,
unit_index, comp_dir,
signature, is_debug_types);
}
else if (dwp_file->version == 2)
{
*slot = create_dwo_unit_in_dwp_v2 (per_objfile, dwp_file,
unit_index, comp_dir,
signature, is_debug_types);
}
else /* version == 5 */
{
*slot = create_dwo_unit_in_dwp_v5 (per_objfile, dwp_file,
unit_index, comp_dir,
signature, is_debug_types);
}
return (struct dwo_unit *) *slot;
}
if (signature_in_table == 0)
return NULL;
hash = (hash + hash2) & mask;
}
error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
" [in module %s]"),
dwp_file->name);
}
/* Subroutine of open_dwo_file,open_dwp_file to simplify them.
Open the file specified by FILE_NAME and hand it off to BFD for
preliminary analysis. Return a newly initialized bfd *, which
includes a canonicalized copy of FILE_NAME.
If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
SEARCH_CWD is true if the current directory is to be searched.
It will be searched before debug-file-directory.
If successful, the file is added to the bfd include table of the
objfile's bfd (see gdb_bfd_record_inclusion).
If unable to find/open the file, return NULL.
NOTE: This function is derived from symfile_bfd_open. */
static gdb_bfd_ref_ptr
try_open_dwop_file (dwarf2_per_objfile *per_objfile,
const char *file_name, int is_dwp, int search_cwd)
{
int desc;
/* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
to debug_file_directory. */
const char *search_path;
static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
gdb::unique_xmalloc_ptr<char> search_path_holder;
if (search_cwd)
{
if (*debug_file_directory != '\0')
{
search_path_holder.reset (concat (".", dirname_separator_string,
debug_file_directory,
(char *) NULL));
search_path = search_path_holder.get ();
}
else
search_path = ".";
}
else
search_path = debug_file_directory;
/* Add the path for the executable binary to the list of search paths. */
std::string objfile_dir = ldirname (objfile_name (per_objfile->objfile));
search_path_holder.reset (concat (objfile_dir.c_str (),
dirname_separator_string,
search_path, nullptr));
search_path = search_path_holder.get ();
openp_flags flags = OPF_RETURN_REALPATH;
if (is_dwp)
flags |= OPF_SEARCH_IN_PATH;
gdb::unique_xmalloc_ptr<char> absolute_name;
desc = openp (search_path, flags, file_name,
O_RDONLY | O_BINARY, &absolute_name);
if (desc < 0)
return NULL;
gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
gnutarget, desc));
if (sym_bfd == NULL)
return NULL;
bfd_set_cacheable (sym_bfd.get (), 1);
if (!bfd_check_format (sym_bfd.get (), bfd_object))
return NULL;
/* Success. Record the bfd as having been included by the objfile's bfd.
This is important because things like demangled_names_hash lives in the
objfile's per_bfd space and may have references to things like symbol
names that live in the DWO/DWP file's per_bfd space. PR 16426. */
gdb_bfd_record_inclusion (per_objfile->objfile->obfd, sym_bfd.get ());
return sym_bfd;
}
/* Try to open DWO file FILE_NAME.
COMP_DIR is the DW_AT_comp_dir attribute.
The result is the bfd handle of the file.
If there is a problem finding or opening the file, return NULL.
Upon success, the canonicalized path of the file is stored in the bfd,
same as symfile_bfd_open. */
static gdb_bfd_ref_ptr
open_dwo_file (dwarf2_per_objfile *per_objfile,
const char *file_name, const char *comp_dir)
{
if (IS_ABSOLUTE_PATH (file_name))
return try_open_dwop_file (per_objfile, file_name,
0 /*is_dwp*/, 0 /*search_cwd*/);
/* Before trying the search path, try DWO_NAME in COMP_DIR. */
if (comp_dir != NULL)
{
gdb::unique_xmalloc_ptr<char> path_to_try
(concat (comp_dir, SLASH_STRING, file_name, (char *) NULL));
/* NOTE: If comp_dir is a relative path, this will also try the
search path, which seems useful. */
gdb_bfd_ref_ptr abfd (try_open_dwop_file (per_objfile, path_to_try.get (),
0 /*is_dwp*/,
1 /*search_cwd*/));
if (abfd != NULL)
return abfd;
}
/* That didn't work, try debug-file-directory, which, despite its name,
is a list of paths. */
if (*debug_file_directory == '\0')
return NULL;
return try_open_dwop_file (per_objfile, file_name,
0 /*is_dwp*/, 1 /*search_cwd*/);
}
/* This function is mapped across the sections and remembers the offset and
size of each of the DWO debugging sections we are interested in. */
static void
dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp,
dwo_sections *dwo_sections)
{
const struct dwop_section_names *names = &dwop_section_names;
if (names->abbrev_dwo.matches (sectp->name))
{
dwo_sections->abbrev.s.section = sectp;
dwo_sections->abbrev.size = bfd_section_size (sectp);
}
else if (names->info_dwo.matches (sectp->name))
{
dwo_sections->info.s.section = sectp;
dwo_sections->info.size = bfd_section_size (sectp);
}
else if (names->line_dwo.matches (sectp->name))
{
dwo_sections->line.s.section = sectp;
dwo_sections->line.size = bfd_section_size (sectp);
}
else if (names->loc_dwo.matches (sectp->name))
{
dwo_sections->loc.s.section = sectp;
dwo_sections->loc.size = bfd_section_size (sectp);
}
else if (names->loclists_dwo.matches (sectp->name))
{
dwo_sections->loclists.s.section = sectp;
dwo_sections->loclists.size = bfd_section_size (sectp);
}
else if (names->macinfo_dwo.matches (sectp->name))
{
dwo_sections->macinfo.s.section = sectp;
dwo_sections->macinfo.size = bfd_section_size (sectp);
}
else if (names->macro_dwo.matches (sectp->name))
{
dwo_sections->macro.s.section = sectp;
dwo_sections->macro.size = bfd_section_size (sectp);
}
else if (names->rnglists_dwo.matches (sectp->name))
{
dwo_sections->rnglists.s.section = sectp;
dwo_sections->rnglists.size = bfd_section_size (sectp);
}
else if (names->str_dwo.matches (sectp->name))
{
dwo_sections->str.s.section = sectp;
dwo_sections->str.size = bfd_section_size (sectp);
}
else if (names->str_offsets_dwo.matches (sectp->name))
{
dwo_sections->str_offsets.s.section = sectp;
dwo_sections->str_offsets.size = bfd_section_size (sectp);
}
else if (names->types_dwo.matches (sectp->name))
{
struct dwarf2_section_info type_section;
memset (&type_section, 0, sizeof (type_section));
type_section.s.section = sectp;
type_section.size = bfd_section_size (sectp);
dwo_sections->types.push_back (type_section);
}
}
/* Initialize the use of the DWO file specified by DWO_NAME and referenced
by PER_CU. This is for the non-DWP case.
The result is NULL if DWO_NAME can't be found. */
static struct dwo_file *
open_and_init_dwo_file (dwarf2_cu *cu, const char *dwo_name,
const char *comp_dir)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
gdb_bfd_ref_ptr dbfd = open_dwo_file (per_objfile, dwo_name, comp_dir);
if (dbfd == NULL)
{
dwarf_read_debug_printf ("DWO file not found: %s", dwo_name);
return NULL;
}
dwo_file_up dwo_file (new struct dwo_file);
dwo_file->dwo_name = dwo_name;
dwo_file->comp_dir = comp_dir;
dwo_file->dbfd = std::move (dbfd);
for (asection *sec : gdb_bfd_sections (dwo_file->dbfd))
dwarf2_locate_dwo_sections (dwo_file->dbfd.get (), sec,
&dwo_file->sections);
create_cus_hash_table (per_objfile, cu, *dwo_file, dwo_file->sections.info,
dwo_file->cus);
if (cu->per_cu->dwarf_version < 5)
{
create_debug_types_hash_table (per_objfile, dwo_file.get (),
dwo_file->sections.types, dwo_file->tus);
}
else
{
create_debug_type_hash_table (per_objfile, dwo_file.get (),
&dwo_file->sections.info, dwo_file->tus,
rcuh_kind::COMPILE);
}
dwarf_read_debug_printf ("DWO file found: %s", dwo_name);
return dwo_file.release ();
}
/* This function is mapped across the sections and remembers the offset and
size of each of the DWP debugging sections common to version 1 and 2 that
we are interested in. */
static void
dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
dwp_file *dwp_file)
{
const struct dwop_section_names *names = &dwop_section_names;
unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
/* Record the ELF section number for later lookup: this is what the
.debug_cu_index,.debug_tu_index tables use in DWP V1. */
gdb_assert (elf_section_nr < dwp_file->num_sections);
dwp_file->elf_sections[elf_section_nr] = sectp;
/* Look for specific sections that we need. */
if (names->str_dwo.matches (sectp->name))
{
dwp_file->sections.str.s.section = sectp;
dwp_file->sections.str.size = bfd_section_size (sectp);
}
else if (names->cu_index.matches (sectp->name))
{
dwp_file->sections.cu_index.s.section = sectp;
dwp_file->sections.cu_index.size = bfd_section_size (sectp);
}
else if (names->tu_index.matches (sectp->name))
{
dwp_file->sections.tu_index.s.section = sectp;
dwp_file->sections.tu_index.size = bfd_section_size (sectp);
}
}
/* This function is mapped across the sections and remembers the offset and
size of each of the DWP version 2 debugging sections that we are interested
in. This is split into a separate function because we don't know if we
have version 1 or 2 or 5 until we parse the cu_index/tu_index sections. */
static void
dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
{
struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
const struct dwop_section_names *names = &dwop_section_names;
unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
/* Record the ELF section number for later lookup: this is what the
.debug_cu_index,.debug_tu_index tables use in DWP V1. */
gdb_assert (elf_section_nr < dwp_file->num_sections);
dwp_file->elf_sections[elf_section_nr] = sectp;
/* Look for specific sections that we need. */
if (names->abbrev_dwo.matches (sectp->name))
{
dwp_file->sections.abbrev.s.section = sectp;
dwp_file->sections.abbrev.size = bfd_section_size (sectp);
}
else if (names->info_dwo.matches (sectp->name))
{
dwp_file->sections.info.s.section = sectp;
dwp_file->sections.info.size = bfd_section_size (sectp);
}
else if (names->line_dwo.matches (sectp->name))
{
dwp_file->sections.line.s.section = sectp;
dwp_file->sections.line.size = bfd_section_size (sectp);
}
else if (names->loc_dwo.matches (sectp->name))
{
dwp_file->sections.loc.s.section = sectp;
dwp_file->sections.loc.size = bfd_section_size (sectp);
}
else if (names->macinfo_dwo.matches (sectp->name))
{
dwp_file->sections.macinfo.s.section = sectp;
dwp_file->sections.macinfo.size = bfd_section_size (sectp);
}
else if (names->macro_dwo.matches (sectp->name))
{
dwp_file->sections.macro.s.section = sectp;
dwp_file->sections.macro.size = bfd_section_size (sectp);
}
else if (names->str_offsets_dwo.matches (sectp->name))
{
dwp_file->sections.str_offsets.s.section = sectp;
dwp_file->sections.str_offsets.size = bfd_section_size (sectp);
}
else if (names->types_dwo.matches (sectp->name))
{
dwp_file->sections.types.s.section = sectp;
dwp_file->sections.types.size = bfd_section_size (sectp);
}
}
/* This function is mapped across the sections and remembers the offset and
size of each of the DWP version 5 debugging sections that we are interested
in. This is split into a separate function because we don't know if we
have version 1 or 2 or 5 until we parse the cu_index/tu_index sections. */
static void
dwarf2_locate_v5_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
{
struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
const struct dwop_section_names *names = &dwop_section_names;
unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
/* Record the ELF section number for later lookup: this is what the
.debug_cu_index,.debug_tu_index tables use in DWP V1. */
gdb_assert (elf_section_nr < dwp_file->num_sections);
dwp_file->elf_sections[elf_section_nr] = sectp;
/* Look for specific sections that we need. */
if (names->abbrev_dwo.matches (sectp->name))
{
dwp_file->sections.abbrev.s.section = sectp;
dwp_file->sections.abbrev.size = bfd_section_size (sectp);
}
else if (names->info_dwo.matches (sectp->name))
{
dwp_file->sections.info.s.section = sectp;
dwp_file->sections.info.size = bfd_section_size (sectp);
}
else if (names->line_dwo.matches (sectp->name))
{
dwp_file->sections.line.s.section = sectp;
dwp_file->sections.line.size = bfd_section_size (sectp);
}
else if (names->loclists_dwo.matches (sectp->name))
{
dwp_file->sections.loclists.s.section = sectp;
dwp_file->sections.loclists.size = bfd_section_size (sectp);
}
else if (names->macro_dwo.matches (sectp->name))
{
dwp_file->sections.macro.s.section = sectp;
dwp_file->sections.macro.size = bfd_section_size (sectp);
}
else if (names->rnglists_dwo.matches (sectp->name))
{
dwp_file->sections.rnglists.s.section = sectp;
dwp_file->sections.rnglists.size = bfd_section_size (sectp);
}
else if (names->str_offsets_dwo.matches (sectp->name))
{
dwp_file->sections.str_offsets.s.section = sectp;
dwp_file->sections.str_offsets.size = bfd_section_size (sectp);
}
}
/* Hash function for dwp_file loaded CUs/TUs. */
static hashval_t
hash_dwp_loaded_cutus (const void *item)
{
const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
/* This drops the top 32 bits of the signature, but is ok for a hash. */
return dwo_unit->signature;
}
/* Equality function for dwp_file loaded CUs/TUs. */
static int
eq_dwp_loaded_cutus (const void *a, const void *b)
{
const struct dwo_unit *dua = (const struct dwo_unit *) a;
const struct dwo_unit *dub = (const struct dwo_unit *) b;
return dua->signature == dub->signature;
}
/* Allocate a hash table for dwp_file loaded CUs/TUs. */
static htab_up
allocate_dwp_loaded_cutus_table ()
{
return htab_up (htab_create_alloc (3,
hash_dwp_loaded_cutus,
eq_dwp_loaded_cutus,
NULL, xcalloc, xfree));
}
/* Try to open DWP file FILE_NAME.
The result is the bfd handle of the file.
If there is a problem finding or opening the file, return NULL.
Upon success, the canonicalized path of the file is stored in the bfd,
same as symfile_bfd_open. */
static gdb_bfd_ref_ptr
open_dwp_file (dwarf2_per_objfile *per_objfile, const char *file_name)
{
gdb_bfd_ref_ptr abfd (try_open_dwop_file (per_objfile, file_name,
1 /*is_dwp*/,
1 /*search_cwd*/));
if (abfd != NULL)
return abfd;
/* Work around upstream bug 15652.
http://sourceware.org/bugzilla/show_bug.cgi?id=15652
[Whether that's a "bug" is debatable, but it is getting in our way.]
We have no real idea where the dwp file is, because gdb's realpath-ing
of the executable's path may have discarded the needed info.
[IWBN if the dwp file name was recorded in the executable, akin to
.gnu_debuglink, but that doesn't exist yet.]
Strip the directory from FILE_NAME and search again. */
if (*debug_file_directory != '\0')
{
/* Don't implicitly search the current directory here.
If the user wants to search "." to handle this case,
it must be added to debug-file-directory. */
return try_open_dwop_file (per_objfile, lbasename (file_name),
1 /*is_dwp*/,
0 /*search_cwd*/);
}
return NULL;
}
/* Initialize the use of the DWP file for the current objfile.
By convention the name of the DWP file is ${objfile}.dwp.
The result is NULL if it can't be found. */
static std::unique_ptr<struct dwp_file>
open_and_init_dwp_file (dwarf2_per_objfile *per_objfile)
{
struct objfile *objfile = per_objfile->objfile;
/* Try to find first .dwp for the binary file before any symbolic links
resolving. */
/* If the objfile is a debug file, find the name of the real binary
file and get the name of dwp file from there. */
std::string dwp_name;
if (objfile->separate_debug_objfile_backlink != NULL)
{
struct objfile *backlink = objfile->separate_debug_objfile_backlink;
const char *backlink_basename = lbasename (backlink->original_name);
dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
}
else
dwp_name = objfile->original_name;
dwp_name += ".dwp";
gdb_bfd_ref_ptr dbfd (open_dwp_file (per_objfile, dwp_name.c_str ()));
if (dbfd == NULL
&& strcmp (objfile->original_name, objfile_name (objfile)) != 0)
{
/* Try to find .dwp for the binary file after gdb_realpath resolving. */
dwp_name = objfile_name (objfile);
dwp_name += ".dwp";
dbfd = open_dwp_file (per_objfile, dwp_name.c_str ());
}
if (dbfd == NULL)
{
dwarf_read_debug_printf ("DWP file not found: %s", dwp_name.c_str ());
return std::unique_ptr<dwp_file> ();
}
const char *name = bfd_get_filename (dbfd.get ());
std::unique_ptr<struct dwp_file> dwp_file
(new struct dwp_file (name, std::move (dbfd)));
dwp_file->num_sections = elf_numsections (dwp_file->dbfd);
dwp_file->elf_sections =
OBSTACK_CALLOC (&per_objfile->per_bfd->obstack,
dwp_file->num_sections, asection *);
for (asection *sec : gdb_bfd_sections (dwp_file->dbfd))
dwarf2_locate_common_dwp_sections (dwp_file->dbfd.get (), sec,
dwp_file.get ());
dwp_file->cus = create_dwp_hash_table (per_objfile, dwp_file.get (), 0);
dwp_file->tus = create_dwp_hash_table (per_objfile, dwp_file.get (), 1);
/* The DWP file version is stored in the hash table. Oh well. */
if (dwp_file->cus && dwp_file->tus
&& dwp_file->cus->version != dwp_file->tus->version)
{
/* Technically speaking, we should try to limp along, but this is
pretty bizarre. We use pulongest here because that's the established
portability solution (e.g, we cannot use %u for uint32_t). */
error (_("Dwarf Error: DWP file CU version %s doesn't match"
" TU version %s [in DWP file %s]"),
pulongest (dwp_file->cus->version),
pulongest (dwp_file->tus->version), dwp_name.c_str ());
}
if (dwp_file->cus)
dwp_file->version = dwp_file->cus->version;
else if (dwp_file->tus)
dwp_file->version = dwp_file->tus->version;
else
dwp_file->version = 2;
for (asection *sec : gdb_bfd_sections (dwp_file->dbfd))
{
if (dwp_file->version == 2)
dwarf2_locate_v2_dwp_sections (dwp_file->dbfd.get (), sec,
dwp_file.get ());
else
dwarf2_locate_v5_dwp_sections (dwp_file->dbfd.get (), sec,
dwp_file.get ());
}
dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table ();
dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table ();
dwarf_read_debug_printf ("DWP file found: %s", dwp_file->name);
dwarf_read_debug_printf (" %s CUs, %s TUs",
pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
return dwp_file;
}
/* Wrapper around open_and_init_dwp_file, only open it once. */
static struct dwp_file *
get_dwp_file (dwarf2_per_objfile *per_objfile)
{
if (!per_objfile->per_bfd->dwp_checked)
{
per_objfile->per_bfd->dwp_file = open_and_init_dwp_file (per_objfile);
per_objfile->per_bfd->dwp_checked = 1;
}
return per_objfile->per_bfd->dwp_file.get ();
}
/* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
or in the DWP file for the objfile, referenced by THIS_UNIT.
If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
This is called, for example, when wanting to read a variable with a
complex location. Therefore we don't want to do file i/o for every call.
Therefore we don't want to look for a DWO file on every call.
Therefore we first see if we've already seen SIGNATURE in a DWP file,
then we check if we've already seen DWO_NAME, and only THEN do we check
for a DWO file.
The result is a pointer to the dwo_unit object or NULL if we didn't find it
(dwo_id mismatch or couldn't find the DWO/DWP file). */
static struct dwo_unit *
lookup_dwo_cutu (dwarf2_cu *cu, const char *dwo_name, const char *comp_dir,
ULONGEST signature, int is_debug_types)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
const char *kind = is_debug_types ? "TU" : "CU";
void **dwo_file_slot;
struct dwo_file *dwo_file;
struct dwp_file *dwp_file;
/* First see if there's a DWP file.
If we have a DWP file but didn't find the DWO inside it, don't
look for the original DWO file. It makes gdb behave differently
depending on whether one is debugging in the build tree. */
dwp_file = get_dwp_file (per_objfile);
if (dwp_file != NULL)
{
const struct dwp_hash_table *dwp_htab =
is_debug_types ? dwp_file->tus : dwp_file->cus;
if (dwp_htab != NULL)
{
struct dwo_unit *dwo_cutu =
lookup_dwo_unit_in_dwp (per_objfile, dwp_file, comp_dir, signature,
is_debug_types);
if (dwo_cutu != NULL)
{
dwarf_read_debug_printf ("Virtual DWO %s %s found: @%s",
kind, hex_string (signature),
host_address_to_string (dwo_cutu));
return dwo_cutu;
}
}
}
else
{
/* No DWP file, look for the DWO file. */
dwo_file_slot = lookup_dwo_file_slot (per_objfile, dwo_name, comp_dir);
if (*dwo_file_slot == NULL)
{
/* Read in the file and build a table of the CUs/TUs it contains. */
*dwo_file_slot = open_and_init_dwo_file (cu, dwo_name, comp_dir);
}
/* NOTE: This will be NULL if unable to open the file. */
dwo_file = (struct dwo_file *) *dwo_file_slot;
if (dwo_file != NULL)
{
struct dwo_unit *dwo_cutu = NULL;
if (is_debug_types && dwo_file->tus)
{
struct dwo_unit find_dwo_cutu;
memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
find_dwo_cutu.signature = signature;
dwo_cutu
= (struct dwo_unit *) htab_find (dwo_file->tus.get (),
&find_dwo_cutu);
}
else if (!is_debug_types && dwo_file->cus)
{
struct dwo_unit find_dwo_cutu;
memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
find_dwo_cutu.signature = signature;
dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus.get (),
&find_dwo_cutu);
}
if (dwo_cutu != NULL)
{
dwarf_read_debug_printf ("DWO %s %s(%s) found: @%s",
kind, dwo_name, hex_string (signature),
host_address_to_string (dwo_cutu));
return dwo_cutu;
}
}
}
/* We didn't find it. This could mean a dwo_id mismatch, or
someone deleted the DWO/DWP file, or the search path isn't set up
correctly to find the file. */
dwarf_read_debug_printf ("DWO %s %s(%s) not found",
kind, dwo_name, hex_string (signature));
/* This is a warning and not a complaint because it can be caused by
pilot error (e.g., user accidentally deleting the DWO). */
{
/* Print the name of the DWP file if we looked there, helps the user
better diagnose the problem. */
std::string dwp_text;
if (dwp_file != NULL)
dwp_text = string_printf (" [in DWP file %s]",
lbasename (dwp_file->name));
warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
" [in module %s]"),
kind, dwo_name, hex_string (signature), dwp_text.c_str (), kind,
sect_offset_str (cu->per_cu->sect_off), objfile_name (objfile));
}
return NULL;
}
/* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
See lookup_dwo_cutu_unit for details. */
static struct dwo_unit *
lookup_dwo_comp_unit (dwarf2_cu *cu, const char *dwo_name, const char *comp_dir,
ULONGEST signature)
{
gdb_assert (!cu->per_cu->is_debug_types);
return lookup_dwo_cutu (cu, dwo_name, comp_dir, signature, 0);
}
/* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
See lookup_dwo_cutu_unit for details. */
static struct dwo_unit *
lookup_dwo_type_unit (dwarf2_cu *cu, const char *dwo_name, const char *comp_dir)
{
gdb_assert (cu->per_cu->is_debug_types);
signatured_type *sig_type = (signatured_type *) cu->per_cu;
return lookup_dwo_cutu (cu, dwo_name, comp_dir, sig_type->signature, 1);
}
/* Traversal function for queue_and_load_all_dwo_tus. */
static int
queue_and_load_dwo_tu (void **slot, void *info)
{
struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
dwarf2_cu *cu = (dwarf2_cu *) info;
ULONGEST signature = dwo_unit->signature;
signatured_type *sig_type = lookup_dwo_signatured_type (cu, signature);
if (sig_type != NULL)
{
/* We pass NULL for DEPENDENT_CU because we don't yet know if there's
a real dependency of PER_CU on SIG_TYPE. That is detected later
while processing PER_CU. */
if (maybe_queue_comp_unit (NULL, sig_type, cu->per_objfile,
cu->per_cu->lang))
load_full_type_unit (sig_type, cu->per_objfile);
cu->per_cu->imported_symtabs_push (sig_type);
}
return 1;
}
/* Queue all TUs contained in the DWO of CU to be read in.
The DWO may have the only definition of the type, though it may not be
referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
static void
queue_and_load_all_dwo_tus (dwarf2_cu *cu)
{
struct dwo_unit *dwo_unit;
struct dwo_file *dwo_file;
gdb_assert (cu != nullptr);
gdb_assert (!cu->per_cu->is_debug_types);
gdb_assert (get_dwp_file (cu->per_objfile) == nullptr);
dwo_unit = cu->dwo_unit;
gdb_assert (dwo_unit != NULL);
dwo_file = dwo_unit->dwo_file;
if (dwo_file->tus != NULL)
htab_traverse_noresize (dwo_file->tus.get (), queue_and_load_dwo_tu, cu);
}
/* Read in various DIEs. */
/* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
Inherit only the children of the DW_AT_abstract_origin DIE not being
already referenced by DW_AT_abstract_origin from the children of the
current DIE. */
static void
inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
{
struct die_info *child_die;
sect_offset *offsetp;
/* Parent of DIE - referenced by DW_AT_abstract_origin. */
struct die_info *origin_die;
/* Iterator of the ORIGIN_DIE children. */
struct die_info *origin_child_die;
struct attribute *attr;
struct dwarf2_cu *origin_cu;
struct pending **origin_previous_list_in_scope;
attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
if (!attr)
return;
/* Note that following die references may follow to a die in a
different cu. */
origin_cu = cu;
origin_die = follow_die_ref (die, attr, &origin_cu);
/* We're inheriting ORIGIN's children into the scope we'd put DIE's
symbols in. */
origin_previous_list_in_scope = origin_cu->list_in_scope;
origin_cu->list_in_scope = cu->list_in_scope;
if (die->tag != origin_die->tag
&& !(die->tag == DW_TAG_inlined_subroutine
&& origin_die->tag == DW_TAG_subprogram))
complaint (_("DIE %s and its abstract origin %s have different tags"),
sect_offset_str (die->sect_off),
sect_offset_str (origin_die->sect_off));
/* Find if the concrete and abstract trees are structurally the
same. This is a shallow traversal and it is not bullet-proof;
the compiler can trick the debugger into believing that the trees
are isomorphic, whereas they actually are not. However, the
likelyhood of this happening is pretty low, and a full-fledged
check would be an overkill. */
bool are_isomorphic = true;
die_info *concrete_child = die->child;
die_info *abstract_child = origin_die->child;
while (concrete_child != nullptr || abstract_child != nullptr)
{
if (concrete_child == nullptr
|| abstract_child == nullptr
|| concrete_child->tag != abstract_child->tag)
{
are_isomorphic = false;
break;
}
concrete_child = concrete_child->sibling;
abstract_child = abstract_child->sibling;
}
/* Walk the origin's children in parallel to the concrete children.
This helps match an origin child in case the debug info misses
DW_AT_abstract_origin attributes. Keep in mind that the abstract
origin tree may not have the same tree structure as the concrete
DIE, though. */
die_info *corresponding_abstract_child
= are_isomorphic ? origin_die->child : nullptr;
std::vector<sect_offset> offsets;
for (child_die = die->child;
child_die && child_die->tag;
child_die = child_die->sibling)
{
struct die_info *child_origin_die;
struct dwarf2_cu *child_origin_cu;
/* We are trying to process concrete instance entries:
DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
it's not relevant to our analysis here. i.e. detecting DIEs that are
present in the abstract instance but not referenced in the concrete
one. */
if (child_die->tag == DW_TAG_call_site
|| child_die->tag == DW_TAG_GNU_call_site)
{
if (are_isomorphic)
corresponding_abstract_child
= corresponding_abstract_child->sibling;
continue;
}
/* For each CHILD_DIE, find the corresponding child of
ORIGIN_DIE. If there is more than one layer of
DW_AT_abstract_origin, follow them all; there shouldn't be,
but GCC versions at least through 4.4 generate this (GCC PR
40573). */
child_origin_die = child_die;
child_origin_cu = cu;
while (1)
{
attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
child_origin_cu);
if (attr == NULL)
break;
child_origin_die = follow_die_ref (child_origin_die, attr,
&child_origin_cu);
}
/* If missing DW_AT_abstract_origin, try the corresponding child
of the origin. Clang emits such lexical scopes. */
if (child_origin_die == child_die
&& dwarf2_attr (child_die, DW_AT_abstract_origin, cu) == nullptr
&& are_isomorphic
&& child_die->tag == DW_TAG_lexical_block)
child_origin_die = corresponding_abstract_child;
/* According to DWARF3 3.3.8.2 #3 new entries without their abstract
counterpart may exist. */
if (child_origin_die != child_die)
{
if (child_die->tag != child_origin_die->tag
&& !(child_die->tag == DW_TAG_inlined_subroutine
&& child_origin_die->tag == DW_TAG_subprogram))
complaint (_("Child DIE %s and its abstract origin %s have "
"different tags"),
sect_offset_str (child_die->sect_off),
sect_offset_str (child_origin_die->sect_off));
if (child_origin_die->parent != origin_die)
complaint (_("Child DIE %s and its abstract origin %s have "
"different parents"),
sect_offset_str (child_die->sect_off),
sect_offset_str (child_origin_die->sect_off));
else
offsets.push_back (child_origin_die->sect_off);
}
if (are_isomorphic)
corresponding_abstract_child = corresponding_abstract_child->sibling;
}
std::sort (offsets.begin (), offsets.end ());
sect_offset *offsets_end = offsets.data () + offsets.size ();
for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
if (offsetp[-1] == *offsetp)
complaint (_("Multiple children of DIE %s refer "
"to DIE %s as their abstract origin"),
sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
offsetp = offsets.data ();
origin_child_die = origin_die->child;
while (origin_child_die && origin_child_die->tag)
{
/* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
while (offsetp < offsets_end
&& *offsetp < origin_child_die->sect_off)
offsetp++;
if (offsetp >= offsets_end
|| *offsetp > origin_child_die->sect_off)
{
/* Found that ORIGIN_CHILD_DIE is really not referenced.
Check whether we're already processing ORIGIN_CHILD_DIE.
This can happen with mutually referenced abstract_origins.
PR 16581. */
if (!origin_child_die->in_process)
process_die (origin_child_die, origin_cu);
}
origin_child_die = origin_child_die->sibling;
}
origin_cu->list_in_scope = origin_previous_list_in_scope;
if (cu != origin_cu)
compute_delayed_physnames (origin_cu);
}
static void
read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
struct context_stack *newobj;
CORE_ADDR lowpc;
CORE_ADDR highpc;
struct die_info *child_die;
struct attribute *attr, *call_line, *call_file;
const char *name;
CORE_ADDR baseaddr;
struct block *block;
int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
std::vector<struct symbol *> template_args;
struct template_symbol *templ_func = NULL;
if (inlined_func)
{
/* If we do not have call site information, we can't show the
caller of this inlined function. That's too confusing, so
only use the scope for local variables. */
call_line = dwarf2_attr (die, DW_AT_call_line, cu);
call_file = dwarf2_attr (die, DW_AT_call_file, cu);
if (call_line == NULL || call_file == NULL)
{
read_lexical_block_scope (die, cu);
return;
}
}
baseaddr = objfile->text_section_offset ();
name = dwarf2_name (die, cu);
/* Ignore functions with missing or empty names. These are actually
illegal according to the DWARF standard. */
if (name == NULL)
{
complaint (_("missing name for subprogram DIE at %s"),
sect_offset_str (die->sect_off));
return;
}
/* Ignore functions with missing or invalid low and high pc attributes. */
if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
<= PC_BOUNDS_INVALID)
{
attr = dwarf2_attr (die, DW_AT_external, cu);
if (attr == nullptr || !attr->as_boolean ())
complaint (_("cannot get low and high bounds "
"for subprogram DIE at %s"),
sect_offset_str (die->sect_off));
return;
}
lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
/* If we have any template arguments, then we must allocate a
different sort of symbol. */
for (child_die = die->child; child_die; child_die = child_die->sibling)
{
if (child_die->tag == DW_TAG_template_type_param
|| child_die->tag == DW_TAG_template_value_param)
{
templ_func = new (&objfile->objfile_obstack) template_symbol;
templ_func->subclass = SYMBOL_TEMPLATE;
break;
}
}
gdb_assert (cu->get_builder () != nullptr);
newobj = cu->get_builder ()->push_context (0, lowpc);
newobj->name = new_symbol (die, read_type_die (die, cu), cu,
(struct symbol *) templ_func);
if (dwarf2_flag_true_p (die, DW_AT_main_subprogram, cu))
set_objfile_main_name (objfile, newobj->name->linkage_name (),
cu->per_cu->lang);
/* If there is a location expression for DW_AT_frame_base, record
it. */
attr = dwarf2_attr (die, DW_AT_frame_base, cu);
if (attr != nullptr)
dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
/* If there is a location for the static link, record it. */
newobj->static_link = NULL;
attr = dwarf2_attr (die, DW_AT_static_link, cu);
if (attr != nullptr)
{
newobj->static_link
= XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
attr_to_dynamic_prop (attr, die, cu, newobj->static_link,
cu->addr_type ());
}
cu->list_in_scope = cu->get_builder ()->get_local_symbols ();
if (die->child != NULL)
{
child_die = die->child;
while (child_die && child_die->tag)
{
if (child_die->tag == DW_TAG_template_type_param
|| child_die->tag == DW_TAG_template_value_param)
{
struct symbol *arg = new_symbol (child_die, NULL, cu);
if (arg != NULL)
template_args.push_back (arg);
}
else
process_die (child_die, cu);
child_die = child_die->sibling;
}
}
inherit_abstract_dies (die, cu);
/* If we have a DW_AT_specification, we might need to import using
directives from the context of the specification DIE. See the
comment in determine_prefix. */
if (cu->per_cu->lang == language_cplus
&& dwarf2_attr (die, DW_AT_specification, cu))
{
struct dwarf2_cu *spec_cu = cu;
struct die_info *spec_die = die_specification (die, &spec_cu);
while (spec_die)
{
child_die = spec_die->child;
while (child_die && child_die->tag)
{
if (child_die->tag == DW_TAG_imported_module)
process_die (child_die, spec_cu);
child_die = child_die->sibling;
}
/* In some cases, GCC generates specification DIEs that
themselves contain DW_AT_specification attributes. */
spec_die = die_specification (spec_die, &spec_cu);
}
}
struct context_stack cstk = cu->get_builder ()->pop_context ();
/* Make a block for the local symbols within. */
block = cu->get_builder ()->finish_block (cstk.name, cstk.old_blocks,
cstk.static_link, lowpc, highpc);
/* For C++, set the block's scope. */
if ((cu->per_cu->lang == language_cplus
|| cu->per_cu->lang == language_fortran
|| cu->per_cu->lang == language_d
|| cu->per_cu->lang == language_rust)
&& cu->processing_has_namespace_info)
block_set_scope (block, determine_prefix (die, cu),
&objfile->objfile_obstack);
/* If we have address ranges, record them. */
dwarf2_record_block_ranges (die, block, baseaddr, cu);
gdbarch_make_symbol_special (gdbarch, cstk.name, objfile);
/* Attach template arguments to function. */
if (!template_args.empty ())
{
gdb_assert (templ_func != NULL);
templ_func->n_template_arguments = template_args.size ();
templ_func->template_arguments
= XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
templ_func->n_template_arguments);
memcpy (templ_func->template_arguments,
template_args.data (),
(templ_func->n_template_arguments * sizeof (struct symbol *)));
/* Make sure that the symtab is set on the new symbols. Even
though they don't appear in this symtab directly, other parts
of gdb assume that symbols do, and this is reasonably
true. */
for (symbol *sym : template_args)
symbol_set_symtab (sym, symbol_symtab (templ_func));
}
/* In C++, we can have functions nested inside functions (e.g., when
a function declares a class that has methods). This means that
when we finish processing a function scope, we may need to go
back to building a containing block's symbol lists. */
*cu->get_builder ()->get_local_symbols () = cstk.locals;
cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
/* If we've finished processing a top-level function, subsequent
symbols go in the file symbol list. */
if (cu->get_builder ()->outermost_context_p ())
cu->list_in_scope = cu->get_builder ()->get_file_symbols ();
}
/* Process all the DIES contained within a lexical block scope. Start
a new scope, process the dies, and then close the scope. */
static void
read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
CORE_ADDR lowpc, highpc;
struct die_info *child_die;
CORE_ADDR baseaddr;
baseaddr = objfile->text_section_offset ();
/* Ignore blocks with missing or invalid low and high pc attributes. */
/* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
as multiple lexical blocks? Handling children in a sane way would
be nasty. Might be easier to properly extend generic blocks to
describe ranges. */
switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
{
case PC_BOUNDS_NOT_PRESENT:
/* DW_TAG_lexical_block has no attributes, process its children as if
there was no wrapping by that DW_TAG_lexical_block.
GCC does no longer produces such DWARF since GCC r224161. */
for (child_die = die->child;
child_die != NULL && child_die->tag;
child_die = child_die->sibling)
{
/* We might already be processing this DIE. This can happen
in an unusual circumstance -- where a subroutine A
appears lexically in another subroutine B, but A actually
inlines B. The recursion is broken here, rather than in
inherit_abstract_dies, because it seems better to simply
drop concrete children here. */
if (!child_die->in_process)
process_die (child_die, cu);
}
return;
case PC_BOUNDS_INVALID:
return;
}
lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
cu->get_builder ()->push_context (0, lowpc);
if (die->child != NULL)
{
child_die = die->child;
while (child_die && child_die->tag)
{
process_die (child_die, cu);
child_die = child_die->sibling;
}
}
inherit_abstract_dies (die, cu);
struct context_stack cstk = cu->get_builder ()->pop_context ();
if (*cu->get_builder ()->get_local_symbols () != NULL
|| (*cu->get_builder ()->get_local_using_directives ()) != NULL)
{
struct block *block
= cu->get_builder ()->finish_block (0, cstk.old_blocks, NULL,
cstk.start_addr, highpc);
/* Note that recording ranges after traversing children, as we
do here, means that recording a parent's ranges entails
walking across all its children's ranges as they appear in
the address map, which is quadratic behavior.
It would be nicer to record the parent's ranges before
traversing its children, simply overriding whatever you find
there. But since we don't even decide whether to create a
block until after we've traversed its children, that's hard
to do. */
dwarf2_record_block_ranges (die, block, baseaddr, cu);
}
*cu->get_builder ()->get_local_symbols () = cstk.locals;
cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
}
/* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
static void
read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
CORE_ADDR pc, baseaddr;
struct attribute *attr;
struct call_site *call_site, call_site_local;
void **slot;
int nparams;
struct die_info *child_die;
baseaddr = objfile->text_section_offset ();
attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
if (attr == NULL)
{
/* This was a pre-DWARF-5 GNU extension alias
for DW_AT_call_return_pc. */
attr = dwarf2_attr (die, DW_AT_low_pc, cu);
}
if (!attr)
{
complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site "
"DIE %s [in module %s]"),
sect_offset_str (die->sect_off), objfile_name (objfile));
return;
}
pc = attr->as_address () + baseaddr;
pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
if (cu->call_site_htab == NULL)
cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
NULL, &objfile->objfile_obstack,
hashtab_obstack_allocate, NULL);
call_site_local.pc = pc;
slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
if (*slot != NULL)
{
complaint (_("Duplicate PC %s for DW_TAG_call_site "
"DIE %s [in module %s]"),
paddress (gdbarch, pc), sect_offset_str (die->sect_off),
objfile_name (objfile));
return;
}
/* Count parameters at the caller. */
nparams = 0;
for (child_die = die->child; child_die && child_die->tag;
child_die = child_die->sibling)
{
if (child_die->tag != DW_TAG_call_site_parameter
&& child_die->tag != DW_TAG_GNU_call_site_parameter)
{
complaint (_("Tag %d is not DW_TAG_call_site_parameter in "
"DW_TAG_call_site child DIE %s [in module %s]"),
child_die->tag, sect_offset_str (child_die->sect_off),
objfile_name (objfile));
continue;
}
nparams++;
}
call_site
= ((struct call_site *)
obstack_alloc (&objfile->objfile_obstack,
sizeof (*call_site)
+ (sizeof (*call_site->parameter) * (nparams - 1))));
*slot = call_site;
memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
call_site->pc = pc;
if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
|| dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
{
struct die_info *func_die;
/* Skip also over DW_TAG_inlined_subroutine. */
for (func_die = die->parent;
func_die && func_die->tag != DW_TAG_subprogram
&& func_die->tag != DW_TAG_subroutine_type;
func_die = func_die->parent);
/* DW_AT_call_all_calls is a superset
of DW_AT_call_all_tail_calls. */
if (func_die
&& !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
&& !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
&& !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
&& !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
{
/* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
not complete. But keep CALL_SITE for look ups via call_site_htab,
both the initial caller containing the real return address PC and
the final callee containing the current PC of a chain of tail
calls do not need to have the tail call list complete. But any
function candidate for a virtual tail call frame searched via
TYPE_TAIL_CALL_LIST must have the tail call list complete to be
determined unambiguously. */
}
else
{
struct type *func_type = NULL;
if (func_die)
func_type = get_die_type (func_die, cu);
if (func_type != NULL)
{
gdb_assert (func_type->code () == TYPE_CODE_FUNC);
/* Enlist this call site to the function. */
call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
TYPE_TAIL_CALL_LIST (func_type) = call_site;
}
else
complaint (_("Cannot find function owning DW_TAG_call_site "
"DIE %s [in module %s]"),
sect_offset_str (die->sect_off), objfile_name (objfile));
}
}
attr = dwarf2_attr (die, DW_AT_call_target, cu);
if (attr == NULL)
attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
if (attr == NULL)
attr = dwarf2_attr (die, DW_AT_call_origin, cu);
if (attr == NULL)
{
/* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
}
SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
if (!attr || (attr->form_is_block () && attr->as_block ()->size == 0))
/* Keep NULL DWARF_BLOCK. */;
else if (attr->form_is_block ())
{
struct dwarf2_locexpr_baton *dlbaton;
struct dwarf_block *block = attr->as_block ();
dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
dlbaton->data = block->data;
dlbaton->size = block->size;
dlbaton->per_objfile = per_objfile;
dlbaton->per_cu = cu->per_cu;
SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
}
else if (attr->form_is_ref ())
{
struct dwarf2_cu *target_cu = cu;
struct die_info *target_die;
target_die = follow_die_ref (die, attr, &target_cu);
gdb_assert (target_cu->per_objfile->objfile == objfile);
if (die_is_declaration (target_die, target_cu))
{
const char *target_physname;
/* Prefer the mangled name; otherwise compute the demangled one. */
target_physname = dw2_linkage_name (target_die, target_cu);
if (target_physname == NULL)
target_physname = dwarf2_physname (NULL, target_die, target_cu);
if (target_physname == NULL)
complaint (_("DW_AT_call_target target DIE has invalid "
"physname, for referencing DIE %s [in module %s]"),
sect_offset_str (die->sect_off), objfile_name (objfile));
else
SET_FIELD_PHYSNAME (call_site->target, target_physname);
}
else
{
CORE_ADDR lowpc;
/* DW_AT_entry_pc should be preferred. */
if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
<= PC_BOUNDS_INVALID)
complaint (_("DW_AT_call_target target DIE has invalid "
"low pc, for referencing DIE %s [in module %s]"),
sect_offset_str (die->sect_off), objfile_name (objfile));
else
{
lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
SET_FIELD_PHYSADDR (call_site->target, lowpc);
}
}
}
else
complaint (_("DW_TAG_call_site DW_AT_call_target is neither "
"block nor reference, for DIE %s [in module %s]"),
sect_offset_str (die->sect_off), objfile_name (objfile));
call_site->per_cu = cu->per_cu;
call_site->per_objfile = per_objfile;
for (child_die = die->child;
child_die && child_die->tag;
child_die = child_die->sibling)
{
struct call_site_parameter *parameter;
struct attribute *loc, *origin;
if (child_die->tag != DW_TAG_call_site_parameter
&& child_die->tag != DW_TAG_GNU_call_site_parameter)
{
/* Already printed the complaint above. */
continue;
}
gdb_assert (call_site->parameter_count < nparams);
parameter = &call_site->parameter[call_site->parameter_count];
/* DW_AT_location specifies the register number or DW_AT_abstract_origin
specifies DW_TAG_formal_parameter. Value of the data assumed for the
register is contained in DW_AT_call_value. */
loc = dwarf2_attr (child_die, DW_AT_location, cu);
origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
if (origin == NULL)
{
/* This was a pre-DWARF-5 GNU extension alias
for DW_AT_call_parameter. */
origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
}
if (loc == NULL && origin != NULL && origin->form_is_ref ())
{
parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
sect_offset sect_off = origin->get_ref_die_offset ();
if (!cu->header.offset_in_cu_p (sect_off))
{
/* As DW_OP_GNU_parameter_ref uses CU-relative offset this
binding can be done only inside one CU. Such referenced DIE
therefore cannot be even moved to DW_TAG_partial_unit. */
complaint (_("DW_AT_call_parameter offset is not in CU for "
"DW_TAG_call_site child DIE %s [in module %s]"),
sect_offset_str (child_die->sect_off),
objfile_name (objfile));
continue;
}
parameter->u.param_cu_off
= (cu_offset) (sect_off - cu->header.sect_off);
}
else if (loc == NULL || origin != NULL || !loc->form_is_block ())
{
complaint (_("No DW_FORM_block* DW_AT_location for "
"DW_TAG_call_site child DIE %s [in module %s]"),
sect_offset_str (child_die->sect_off), objfile_name (objfile));
continue;
}
else
{
struct dwarf_block *block = loc->as_block ();
parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
(block->data, &block->data[block->size]);
if (parameter->u.dwarf_reg != -1)
parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
else if (dwarf_block_to_sp_offset (gdbarch, block->data,
&block->data[block->size],
&parameter->u.fb_offset))
parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
else
{
complaint (_("Only single DW_OP_reg or DW_OP_fbreg is supported "
"for DW_FORM_block* DW_AT_location is supported for "
"DW_TAG_call_site child DIE %s "
"[in module %s]"),
sect_offset_str (child_die->sect_off),
objfile_name (objfile));
continue;
}
}
attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
if (attr == NULL)
attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
if (attr == NULL || !attr->form_is_block ())
{
complaint (_("No DW_FORM_block* DW_AT_call_value for "
"DW_TAG_call_site child DIE %s [in module %s]"),
sect_offset_str (child_die->sect_off),
objfile_name (objfile));
continue;
}
struct dwarf_block *block = attr->as_block ();
parameter->value = block->data;
parameter->value_size = block->size;
/* Parameters are not pre-cleared by memset above. */
parameter->data_value = NULL;
parameter->data_value_size = 0;
call_site->parameter_count++;
attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
if (attr == NULL)
attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
if (attr != nullptr)
{
if (!attr->form_is_block ())
complaint (_("No DW_FORM_block* DW_AT_call_data_value for "
"DW_TAG_call_site child DIE %s [in module %s]"),
sect_offset_str (child_die->sect_off),
objfile_name (objfile));
else
{
block = attr->as_block ();
parameter->data_value = block->data;
parameter->data_value_size = block->size;
}
}
}
}
/* Helper function for read_variable. If DIE represents a virtual
table, then return the type of the concrete object that is
associated with the virtual table. Otherwise, return NULL. */
static struct type *
rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
if (attr == NULL)
return NULL;
/* Find the type DIE. */
struct die_info *type_die = NULL;
struct dwarf2_cu *type_cu = cu;
if (attr->form_is_ref ())
type_die = follow_die_ref (die, attr, &type_cu);
if (type_die == NULL)
return NULL;
if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
return NULL;
return die_containing_type (type_die, type_cu);
}
/* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
static void
read_variable (struct die_info *die, struct dwarf2_cu *cu)
{
struct rust_vtable_symbol *storage = NULL;
if (cu->per_cu->lang == language_rust)
{
struct type *containing_type = rust_containing_type (die, cu);
if (containing_type != NULL)
{
struct objfile *objfile = cu->per_objfile->objfile;
storage = new (&objfile->objfile_obstack) rust_vtable_symbol;
storage->concrete_type = containing_type;
storage->subclass = SYMBOL_RUST_VTABLE;
}
}
struct symbol *res = new_symbol (die, NULL, cu, storage);
struct attribute *abstract_origin
= dwarf2_attr (die, DW_AT_abstract_origin, cu);
struct attribute *loc = dwarf2_attr (die, DW_AT_location, cu);
if (res == NULL && loc && abstract_origin)
{
/* We have a variable without a name, but with a location and an abstract
origin. This may be a concrete instance of an abstract variable
referenced from an DW_OP_GNU_variable_value, so save it to find it back
later. */
struct dwarf2_cu *origin_cu = cu;
struct die_info *origin_die
= follow_die_ref (die, abstract_origin, &origin_cu);
dwarf2_per_objfile *per_objfile = cu->per_objfile;
per_objfile->per_bfd->abstract_to_concrete
[origin_die->sect_off].push_back (die->sect_off);
}
}
/* Call CALLBACK from DW_AT_ranges attribute value OFFSET
reading .debug_rnglists.
Callback's type should be:
void (CORE_ADDR range_beginning, CORE_ADDR range_end)
Return true if the attributes are present and valid, otherwise,
return false. */
template <typename Callback>
static bool
dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
dwarf_tag tag, Callback &&callback)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
bfd *obfd = objfile->obfd;
/* Base address selection entry. */
gdb::optional<CORE_ADDR> base;
const gdb_byte *buffer;
bool overflow = false;
ULONGEST addr_index;
struct dwarf2_section_info *rnglists_section;
base = cu->base_address;
rnglists_section = cu_debug_rnglists_section (cu, tag);
rnglists_section->read (objfile);
if (offset >= rnglists_section->size)
{
complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
offset);
return false;
}
buffer = rnglists_section->buffer + offset;
while (1)
{
/* Initialize it due to a false compiler warning. */
CORE_ADDR range_beginning = 0, range_end = 0;
const gdb_byte *buf_end = (rnglists_section->buffer
+ rnglists_section->size);
unsigned int bytes_read;
if (buffer == buf_end)
{
overflow = true;
break;
}
const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
switch (rlet)
{
case DW_RLE_end_of_list:
break;
case DW_RLE_base_address:
if (buffer + cu->header.addr_size > buf_end)
{
overflow = true;
break;
}
base = cu->header.read_address (obfd, buffer, &bytes_read);
buffer += bytes_read;
break;
case DW_RLE_base_addressx:
addr_index = read_unsigned_leb128 (obfd, buffer, &bytes_read);
buffer += bytes_read;
base = read_addr_index (cu, addr_index);
break;
case DW_RLE_start_length:
if (buffer + cu->header.addr_size > buf_end)
{
overflow = true;
break;
}
range_beginning = cu->header.read_address (obfd, buffer,
&bytes_read);
buffer += bytes_read;
range_end = (range_beginning
+ read_unsigned_leb128 (obfd, buffer, &bytes_read));
buffer += bytes_read;
if (buffer > buf_end)
{
overflow = true;
break;
}
break;
case DW_RLE_startx_length:
addr_index = read_unsigned_leb128 (obfd, buffer, &bytes_read);
buffer += bytes_read;
range_beginning = read_addr_index (cu, addr_index);
if (buffer > buf_end)
{
overflow = true;
break;
}
range_end = (range_beginning
+ read_unsigned_leb128 (obfd, buffer, &bytes_read));
buffer += bytes_read;
break;
case DW_RLE_offset_pair:
range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
buffer += bytes_read;
if (buffer > buf_end)
{
overflow = true;
break;
}
range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
buffer += bytes_read;
if (buffer > buf_end)
{
overflow = true;
break;
}
break;
case DW_RLE_start_end:
if (buffer + 2 * cu->header.addr_size > buf_end)
{
overflow = true;
break;
}
range_beginning = cu->header.read_address (obfd, buffer,
&bytes_read);
buffer += bytes_read;
range_end = cu->header.read_address (obfd, buffer, &bytes_read);
buffer += bytes_read;
break;
case DW_RLE_startx_endx:
addr_index = read_unsigned_leb128 (obfd, buffer, &bytes_read);
buffer += bytes_read;
range_beginning = read_addr_index (cu, addr_index);
if (buffer > buf_end)
{
overflow = true;
break;
}
addr_index = read_unsigned_leb128 (obfd, buffer, &bytes_read);
buffer += bytes_read;
range_end = read_addr_index (cu, addr_index);
break;
default:
complaint (_("Invalid .debug_rnglists data (no base address)"));
return false;
}
if (rlet == DW_RLE_end_of_list || overflow)
break;
if (rlet == DW_RLE_base_address)
continue;
if (range_beginning > range_end)
{
/* Inverted range entries are invalid. */
complaint (_("Invalid .debug_rnglists data (inverted range)"));
return false;
}
/* Empty range entries have no effect. */
if (range_beginning == range_end)
continue;
/* Only DW_RLE_offset_pair needs the base address added. */
if (rlet == DW_RLE_offset_pair)
{
if (!base.has_value ())
{
/* We have no valid base address for the DW_RLE_offset_pair. */
complaint (_("Invalid .debug_rnglists data (no base address for "
"DW_RLE_offset_pair)"));
return false;
}
range_beginning += *base;
range_end += *base;
}
/* A not-uncommon case of bad debug info.
Don't pollute the addrmap with bad data. */
if (range_beginning == 0
&& !per_objfile->per_bfd->has_section_at_zero)
{
complaint (_(".debug_rnglists entry has start address of zero"
" [in module %s]"), objfile_name (objfile));
continue;
}
callback (range_beginning, range_end);
}
if (overflow)
{
complaint (_("Offset %d is not terminated "
"for DW_AT_ranges attribute"),
offset);
return false;
}
return true;
}
/* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
Callback's type should be:
void (CORE_ADDR range_beginning, CORE_ADDR range_end)
Return 1 if the attributes are present and valid, otherwise, return 0. */
template <typename Callback>
static int
dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu, dwarf_tag tag,
Callback &&callback)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct comp_unit_head *cu_header = &cu->header;
bfd *obfd = objfile->obfd;
unsigned int addr_size = cu_header->addr_size;
CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
/* Base address selection entry. */
gdb::optional<CORE_ADDR> base;
unsigned int dummy;
const gdb_byte *buffer;
if (cu_header->version >= 5)
return dwarf2_rnglists_process (offset, cu, tag, callback);
base = cu->base_address;
per_objfile->per_bfd->ranges.read (objfile);
if (offset >= per_objfile->per_bfd->ranges.size)
{
complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
offset);
return 0;
}
buffer = per_objfile->per_bfd->ranges.buffer + offset;
while (1)
{
CORE_ADDR range_beginning, range_end;
range_beginning = cu->header.read_address (obfd, buffer, &dummy);
buffer += addr_size;
range_end = cu->header.read_address (obfd, buffer, &dummy);
buffer += addr_size;
offset += 2 * addr_size;
/* An end of list marker is a pair of zero addresses. */
if (range_beginning == 0 && range_end == 0)
/* Found the end of list entry. */
break;
/* Each base address selection entry is a pair of 2 values.
The first is the largest possible address, the second is
the base address. Check for a base address here. */
if ((range_beginning & mask) == mask)
{
/* If we found the largest possible address, then we already
have the base address in range_end. */
base = range_end;
continue;
}
if (!base.has_value ())
{
/* We have no valid base address for the ranges
data. */
complaint (_("Invalid .debug_ranges data (no base address)"));
return 0;
}
if (range_beginning > range_end)
{
/* Inverted range entries are invalid. */
complaint (_("Invalid .debug_ranges data (inverted range)"));
return 0;
}
/* Empty range entries have no effect. */
if (range_beginning == range_end)
continue;
range_beginning += *base;
range_end += *base;
/* A not-uncommon case of bad debug info.
Don't pollute the addrmap with bad data. */
if (range_beginning == 0
&& !per_objfile->per_bfd->has_section_at_zero)
{
complaint (_(".debug_ranges entry has start address of zero"
" [in module %s]"), objfile_name (objfile));
continue;
}
callback (range_beginning, range_end);
}
return 1;
}
/* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
Return 1 if the attributes are present and valid, otherwise, return 0.
If RANGES_PST is not NULL we should set up the `psymtabs_addrmap'. */
static int
dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
CORE_ADDR *high_return, struct dwarf2_cu *cu,
dwarf2_psymtab *ranges_pst, dwarf_tag tag)
{
struct objfile *objfile = cu->per_objfile->objfile;
dwarf2_per_bfd *per_bfd = cu->per_objfile->per_bfd;
struct gdbarch *gdbarch = objfile->arch ();
const CORE_ADDR baseaddr = objfile->text_section_offset ();
int low_set = 0;
CORE_ADDR low = 0;
CORE_ADDR high = 0;
int retval;
retval = dwarf2_ranges_process (offset, cu, tag,
[&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
{
if (ranges_pst != NULL)
{
CORE_ADDR lowpc;
CORE_ADDR highpc;
lowpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
range_beginning + baseaddr)
- baseaddr);
highpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
range_end + baseaddr)
- baseaddr);
addrmap_set_empty (per_bfd->partial_symtabs->psymtabs_addrmap,
lowpc, highpc - 1, ranges_pst);
}
/* FIXME: This is recording everything as a low-high
segment of consecutive addresses. We should have a
data structure for discontiguous block ranges
instead. */
if (! low_set)
{
low = range_beginning;
high = range_end;
low_set = 1;
}
else
{
if (range_beginning < low)
low = range_beginning;
if (range_end > high)
high = range_end;
}
});
if (!retval)
return 0;
if (! low_set)
/* If the first entry is an end-of-list marker, the range
describes an empty scope, i.e. no instructions. */
return 0;
if (low_return)
*low_return = low;
if (high_return)
*high_return = high;
return 1;
}
/* Get low and high pc attributes from a die. See enum pc_bounds_kind
definition for the return value. *LOWPC and *HIGHPC are set iff
neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
static enum pc_bounds_kind
dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
CORE_ADDR *highpc, struct dwarf2_cu *cu,
dwarf2_psymtab *pst)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct attribute *attr;
struct attribute *attr_high;
CORE_ADDR low = 0;
CORE_ADDR high = 0;
enum pc_bounds_kind ret;
attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
if (attr_high)
{
attr = dwarf2_attr (die, DW_AT_low_pc, cu);
if (attr != nullptr)
{
low = attr->as_address ();
high = attr_high->as_address ();
if (cu->header.version >= 4 && attr_high->form_is_constant ())
high += low;
}
else
/* Found high w/o low attribute. */
return PC_BOUNDS_INVALID;
/* Found consecutive range of addresses. */
ret = PC_BOUNDS_HIGH_LOW;
}
else
{
attr = dwarf2_attr (die, DW_AT_ranges, cu);
if (attr != nullptr && attr->form_is_unsigned ())
{
/* Offset in the .debug_ranges or .debug_rnglist section (depending
on DWARF version). */
ULONGEST ranges_offset = attr->as_unsigned ();
/* See dwarf2_cu::gnu_ranges_base's doc for why we might want to add
this value. */
if (die->tag != DW_TAG_compile_unit)
ranges_offset += cu->gnu_ranges_base;
/* Value of the DW_AT_ranges attribute is the offset in the
.debug_ranges section. */
if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst,
die->tag))
return PC_BOUNDS_INVALID;
/* Found discontinuous range of addresses. */
ret = PC_BOUNDS_RANGES;
}
else
return PC_BOUNDS_NOT_PRESENT;
}
/* partial_die_info::read has also the strict LOW < HIGH requirement. */
if (high <= low)
return PC_BOUNDS_INVALID;
/* When using the GNU linker, .gnu.linkonce. sections are used to
eliminate duplicate copies of functions and vtables and such.
The linker will arbitrarily choose one and discard the others.
The AT_*_pc values for such functions refer to local labels in
these sections. If the section from that file was discarded, the
labels are not in the output, so the relocs get a value of 0.
If this is a discarded function, mark the pc bounds as invalid,
so that GDB will ignore it. */
if (low == 0 && !per_objfile->per_bfd->has_section_at_zero)
return PC_BOUNDS_INVALID;
*lowpc = low;
if (highpc)
*highpc = high;
return ret;
}
/* Assuming that DIE represents a subprogram DIE or a lexical block, get
its low and high PC addresses. Do nothing if these addresses could not
be determined. Otherwise, set LOWPC to the low address if it is smaller,
and HIGHPC to the high address if greater than HIGHPC. */
static void
dwarf2_get_subprogram_pc_bounds (struct die_info *die,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
struct dwarf2_cu *cu)
{
CORE_ADDR low, high;
struct die_info *child = die->child;
if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
{
*lowpc = std::min (*lowpc, low);
*highpc = std::max (*highpc, high);
}
/* If the language does not allow nested subprograms (either inside
subprograms or lexical blocks), we're done. */
if (cu->per_cu->lang != language_ada)
return;
/* Check all the children of the given DIE. If it contains nested
subprograms, then check their pc bounds. Likewise, we need to
check lexical blocks as well, as they may also contain subprogram
definitions. */
while (child && child->tag)
{
if (child->tag == DW_TAG_subprogram
|| child->tag == DW_TAG_lexical_block)
dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
child = child->sibling;
}
}
/* Get the low and high pc's represented by the scope DIE, and store
them in *LOWPC and *HIGHPC. If the correct values can't be
determined, set *LOWPC to -1 and *HIGHPC to 0. */
static void
get_scope_pc_bounds (struct die_info *die,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
struct dwarf2_cu *cu)
{
CORE_ADDR best_low = (CORE_ADDR) -1;
CORE_ADDR best_high = (CORE_ADDR) 0;
CORE_ADDR current_low, current_high;
if (dwarf2_get_pc_bounds (die, &current_low, &current_high, cu, NULL)
>= PC_BOUNDS_RANGES)
{
best_low = current_low;
best_high = current_high;
}
else
{
struct die_info *child = die->child;
while (child && child->tag)
{
switch (child->tag) {
case DW_TAG_subprogram:
dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
break;
case DW_TAG_namespace:
case DW_TAG_module:
/* FIXME: carlton/2004-01-16: Should we do this for
DW_TAG_class_type/DW_TAG_structure_type, too? I think
that current GCC's always emit the DIEs corresponding
to definitions of methods of classes as children of a
DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
the DIEs giving the declarations, which could be
anywhere). But I don't see any reason why the
standards says that they have to be there. */
get_scope_pc_bounds (child, &current_low, &current_high, cu);
if (current_low != ((CORE_ADDR) -1))
{
best_low = std::min (best_low, current_low);
best_high = std::max (best_high, current_high);
}
break;
default:
/* Ignore. */
break;
}
child = child->sibling;
}
}
*lowpc = best_low;
*highpc = best_high;
}
/* Record the address ranges for BLOCK, offset by BASEADDR, as given
in DIE. */
static void
dwarf2_record_block_ranges (struct die_info *die, struct block *block,
CORE_ADDR baseaddr, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
struct attribute *attr;
struct attribute *attr_high;
attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
if (attr_high)
{
attr = dwarf2_attr (die, DW_AT_low_pc, cu);
if (attr != nullptr)
{
CORE_ADDR low = attr->as_address ();
CORE_ADDR high = attr_high->as_address ();
if (cu->header.version >= 4 && attr_high->form_is_constant ())
high += low;
low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
cu->get_builder ()->record_block_range (block, low, high - 1);
}
}
attr = dwarf2_attr (die, DW_AT_ranges, cu);
if (attr != nullptr && attr->form_is_unsigned ())
{
/* Offset in the .debug_ranges or .debug_rnglist section (depending
on DWARF version). */
ULONGEST ranges_offset = attr->as_unsigned ();
/* See dwarf2_cu::gnu_ranges_base's doc for why we might want to add
this value. */
if (die->tag != DW_TAG_compile_unit)
ranges_offset += cu->gnu_ranges_base;
std::vector<blockrange> blockvec;
dwarf2_ranges_process (ranges_offset, cu, die->tag,
[&] (CORE_ADDR start, CORE_ADDR end)
{
start += baseaddr;
end += baseaddr;
start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
cu->get_builder ()->record_block_range (block, start, end - 1);
blockvec.emplace_back (start, end);
});
BLOCK_RANGES(block) = make_blockranges (objfile, blockvec);
}
}
/* Check whether the producer field indicates either of GCC < 4.6, or the
Intel C/C++ compiler, and cache the result in CU. */
static void
check_producer (struct dwarf2_cu *cu)
{
int major, minor;
if (cu->producer == NULL)
{
/* For unknown compilers expect their behavior is DWARF version
compliant.
GCC started to support .debug_types sections by -gdwarf-4 since
gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
interpreted incorrectly by GDB now - GCC PR debug/48229. */
}
else if (producer_is_gcc (cu->producer, &major, &minor))
{
cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
}
else if (producer_is_icc (cu->producer, &major, &minor))
{
cu->producer_is_icc = true;
cu->producer_is_icc_lt_14 = major < 14;
}
else if (startswith (cu->producer, "CodeWarrior S12/L-ISA"))
cu->producer_is_codewarrior = true;
else
{
/* For other non-GCC compilers, expect their behavior is DWARF version
compliant. */
}
cu->checked_producer = true;
}
/* Check for GCC PR debug/45124 fix which is not present in any G++ version up
to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
during 4.6.0 experimental. */
static bool
producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
{
if (!cu->checked_producer)
check_producer (cu);
return cu->producer_is_gxx_lt_4_6;
}
/* Codewarrior (at least as of version 5.0.40) generates dwarf line information
with incorrect is_stmt attributes. */
static bool
producer_is_codewarrior (struct dwarf2_cu *cu)
{
if (!cu->checked_producer)
check_producer (cu);
return cu->producer_is_codewarrior;
}
/* Return the accessibility of DIE, as given by DW_AT_accessibility.
If that attribute is not available, return the appropriate
default. */
static enum dwarf_access_attribute
dwarf2_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
{
attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
if (attr != nullptr)
{
LONGEST value = attr->constant_value (-1);
if (value == DW_ACCESS_public
|| value == DW_ACCESS_protected
|| value == DW_ACCESS_private)
return (dwarf_access_attribute) value;
complaint (_("Unhandled DW_AT_accessibility value (%s)"),
plongest (value));
}
if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
{
/* The default DWARF 2 accessibility for members is public, the default
accessibility for inheritance is private. */
if (die->tag != DW_TAG_inheritance)
return DW_ACCESS_public;
else
return DW_ACCESS_private;
}
else
{
/* DWARF 3+ defines the default accessibility a different way. The same
rules apply now for DW_TAG_inheritance as for the members and it only
depends on the container kind. */
if (die->parent->tag == DW_TAG_class_type)
return DW_ACCESS_private;
else
return DW_ACCESS_public;
}
}
/* Look for DW_AT_data_member_location. Set *OFFSET to the byte
offset. If the attribute was not found return 0, otherwise return
1. If it was found but could not properly be handled, set *OFFSET
to 0. */
static int
handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
LONGEST *offset)
{
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
if (attr != NULL)
{
*offset = 0;
/* Note that we do not check for a section offset first here.
This is because DW_AT_data_member_location is new in DWARF 4,
so if we see it, we can assume that a constant form is really
a constant and not a section offset. */
if (attr->form_is_constant ())
*offset = attr->constant_value (0);
else if (attr->form_is_section_offset ())
dwarf2_complex_location_expr_complaint ();
else if (attr->form_is_block ())
*offset = decode_locdesc (attr->as_block (), cu);
else
dwarf2_complex_location_expr_complaint ();
return 1;
}
return 0;
}
/* Look for DW_AT_data_member_location and store the results in FIELD. */
static void
handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
struct field *field)
{
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
if (attr != NULL)
{
if (attr->form_is_constant ())
{
LONGEST offset = attr->constant_value (0);
SET_FIELD_BITPOS (*field, offset * bits_per_byte);
}
else if (attr->form_is_section_offset ())
dwarf2_complex_location_expr_complaint ();
else if (attr->form_is_block ())
{
bool handled;
CORE_ADDR offset = decode_locdesc (attr->as_block (), cu, &handled);
if (handled)
SET_FIELD_BITPOS (*field, offset * bits_per_byte);
else
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct dwarf2_locexpr_baton *dlbaton
= XOBNEW (&objfile->objfile_obstack,
struct dwarf2_locexpr_baton);
dlbaton->data = attr->as_block ()->data;
dlbaton->size = attr->as_block ()->size;
/* When using this baton, we want to compute the address
of the field, not the value. This is why
is_reference is set to false here. */
dlbaton->is_reference = false;
dlbaton->per_objfile = per_objfile;
dlbaton->per_cu = cu->per_cu;
SET_FIELD_DWARF_BLOCK (*field, dlbaton);
}
}
else
dwarf2_complex_location_expr_complaint ();
}
}
/* Add an aggregate field to the field list. */
static void
dwarf2_add_field (struct field_info *fip, struct die_info *die,
struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
struct nextfield *new_field;
struct attribute *attr;
struct field *fp;
const char *fieldname = "";
if (die->tag == DW_TAG_inheritance)
{
fip->baseclasses.emplace_back ();
new_field = &fip->baseclasses.back ();
}
else
{
fip->fields.emplace_back ();
new_field = &fip->fields.back ();
}
new_field->offset = die->sect_off;
new_field->accessibility = dwarf2_access_attribute (die, cu);
if (new_field->accessibility != DW_ACCESS_public)
fip->non_public_fields = true;
attr = dwarf2_attr (die, DW_AT_virtuality, cu);
if (attr != nullptr)
new_field->virtuality = attr->as_virtuality ();
else
new_field->virtuality = DW_VIRTUALITY_none;
fp = &new_field->field;
if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
{
/* Data member other than a C++ static data member. */
/* Get type of field. */
fp->set_type (die_type (die, cu));
SET_FIELD_BITPOS (*fp, 0);
/* Get bit size of field (zero if none). */
attr = dwarf2_attr (die, DW_AT_bit_size, cu);
if (attr != nullptr)
{
FIELD_BITSIZE (*fp) = attr->constant_value (0);
}
else
{
FIELD_BITSIZE (*fp) = 0;
}
/* Get bit offset of field. */
handle_data_member_location (die, cu, fp);
attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
if (attr != nullptr && attr->form_is_constant ())
{
if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
{
/* For big endian bits, the DW_AT_bit_offset gives the
additional bit offset from the MSB of the containing
anonymous object to the MSB of the field. We don't
have to do anything special since we don't need to
know the size of the anonymous object. */
SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
+ attr->constant_value (0)));
}
else
{
/* For little endian bits, compute the bit offset to the
MSB of the anonymous object, subtract off the number of
bits from the MSB of the field to the MSB of the
object, and then subtract off the number of bits of
the field itself. The result is the bit offset of
the LSB of the field. */
int anonymous_size;
int bit_offset = attr->constant_value (0);
attr = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr != nullptr && attr->form_is_constant ())
{
/* The size of the anonymous object containing
the bit field is explicit, so use the
indicated size (in bytes). */
anonymous_size = attr->constant_value (0);
}
else
{
/* The size of the anonymous object containing
the bit field must be inferred from the type
attribute of the data member containing the
bit field. */
anonymous_size = TYPE_LENGTH (fp->type ());
}
SET_FIELD_BITPOS (*fp,
(FIELD_BITPOS (*fp)
+ anonymous_size * bits_per_byte
- bit_offset - FIELD_BITSIZE (*fp)));
}
}
attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
if (attr != NULL)
SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
+ attr->constant_value (0)));
/* Get name of field. */
fieldname = dwarf2_name (die, cu);
if (fieldname == NULL)
fieldname = "";
/* The name is already allocated along with this objfile, so we don't
need to duplicate it for the type. */
fp->name = fieldname;
/* Change accessibility for artificial fields (e.g. virtual table
pointer or virtual base class pointer) to private. */
if (dwarf2_attr (die, DW_AT_artificial, cu))
{
FIELD_ARTIFICIAL (*fp) = 1;
new_field->accessibility = DW_ACCESS_private;
fip->non_public_fields = true;
}
}
else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
{
/* C++ static member. */
/* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
is a declaration, but all versions of G++ as of this writing
(so through at least 3.2.1) incorrectly generate
DW_TAG_variable tags. */
const char *physname;
/* Get name of field. */
fieldname = dwarf2_name (die, cu);
if (fieldname == NULL)
return;
attr = dwarf2_attr (die, DW_AT_const_value, cu);
if (attr
/* Only create a symbol if this is an external value.
new_symbol checks this and puts the value in the global symbol
table, which we want. If it is not external, new_symbol
will try to put the value in cu->list_in_scope which is wrong. */
&& dwarf2_flag_true_p (die, DW_AT_external, cu))
{
/* A static const member, not much different than an enum as far as
we're concerned, except that we can support more types. */
new_symbol (die, NULL, cu);
}
/* Get physical name. */
physname = dwarf2_physname (fieldname, die, cu);
/* The name is already allocated along with this objfile, so we don't
need to duplicate it for the type. */
SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
fp->set_type (die_type (die, cu));
FIELD_NAME (*fp) = fieldname;
}
else if (die->tag == DW_TAG_inheritance)
{
/* C++ base class field. */
handle_data_member_location (die, cu, fp);
FIELD_BITSIZE (*fp) = 0;
fp->set_type (die_type (die, cu));
FIELD_NAME (*fp) = fp->type ()->name ();
}
else
gdb_assert_not_reached ("missing case in dwarf2_add_field");
}
/* Can the type given by DIE define another type? */
static bool
type_can_define_types (const struct die_info *die)
{
switch (die->tag)
{
case DW_TAG_typedef:
case DW_TAG_class_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_enumeration_type:
return true;
default:
return false;
}
}
/* Add a type definition defined in the scope of the FIP's class. */
static void
dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
struct dwarf2_cu *cu)
{
struct decl_field fp;
memset (&fp, 0, sizeof (fp));
gdb_assert (type_can_define_types (die));
/* Get name of field. NULL is okay here, meaning an anonymous type. */
fp.name = dwarf2_name (die, cu);
fp.type = read_type_die (die, cu);
/* Save accessibility. */
dwarf_access_attribute accessibility = dwarf2_access_attribute (die, cu);
switch (accessibility)
{
case DW_ACCESS_public:
/* The assumed value if neither private nor protected. */
break;
case DW_ACCESS_private:
fp.is_private = 1;
break;
case DW_ACCESS_protected:
fp.is_protected = 1;
break;
}
if (die->tag == DW_TAG_typedef)
fip->typedef_field_list.push_back (fp);
else
fip->nested_types_list.push_back (fp);
}
/* A convenience typedef that's used when finding the discriminant
field for a variant part. */
typedef std::unordered_map<sect_offset, int, gdb::hash_enum<sect_offset>>
offset_map_type;
/* Compute the discriminant range for a given variant. OBSTACK is
where the results will be stored. VARIANT is the variant to
process. IS_UNSIGNED indicates whether the discriminant is signed
or unsigned. */
static const gdb::array_view<discriminant_range>
convert_variant_range (struct obstack *obstack, const variant_field &variant,
bool is_unsigned)
{
std::vector<discriminant_range> ranges;
if (variant.default_branch)
return {};
if (variant.discr_list_data == nullptr)
{
discriminant_range r
= {variant.discriminant_value, variant.discriminant_value};
ranges.push_back (r);
}
else
{
gdb::array_view<const gdb_byte> data (variant.discr_list_data->data,
variant.discr_list_data->size);
while (!data.empty ())
{
if (data[0] != DW_DSC_range && data[0] != DW_DSC_label)
{
complaint (_("invalid discriminant marker: %d"), data[0]);
break;
}
bool is_range = data[0] == DW_DSC_range;
data = data.slice (1);
ULONGEST low, high;
unsigned int bytes_read;
if (data.empty ())
{
complaint (_("DW_AT_discr_list missing low value"));
break;
}
if (is_unsigned)
low = read_unsigned_leb128 (nullptr, data.data (), &bytes_read);
else
low = (ULONGEST) read_signed_leb128 (nullptr, data.data (),
&bytes_read);
data = data.slice (bytes_read);
if (is_range)
{
if (data.empty ())
{
complaint (_("DW_AT_discr_list missing high value"));
break;
}
if (is_unsigned)
high = read_unsigned_leb128 (nullptr, data.data (),
&bytes_read);
else
high = (LONGEST) read_signed_leb128 (nullptr, data.data (),
&bytes_read);
data = data.slice (bytes_read);
}
else
high = low;
ranges.push_back ({ low, high });
}
}
discriminant_range *result = XOBNEWVEC (obstack, discriminant_range,
ranges.size ());
std::copy (ranges.begin (), ranges.end (), result);
return gdb::array_view<discriminant_range> (result, ranges.size ());
}
static const gdb::array_view<variant_part> create_variant_parts
(struct obstack *obstack,
const offset_map_type &offset_map,
struct field_info *fi,
const std::vector<variant_part_builder> &variant_parts);
/* Fill in a "struct variant" for a given variant field. RESULT is
the variant to fill in. OBSTACK is where any needed allocations
will be done. OFFSET_MAP holds the mapping from section offsets to
fields for the type. FI describes the fields of the type we're
processing. FIELD is the variant field we're converting. */
static void
create_one_variant (variant &result, struct obstack *obstack,
const offset_map_type &offset_map,
struct field_info *fi, const variant_field &field)
{
result.discriminants = convert_variant_range (obstack, field, false);
result.first_field = field.first_field + fi->baseclasses.size ();
result.last_field = field.last_field + fi->baseclasses.size ();
result.parts = create_variant_parts (obstack, offset_map, fi,
field.variant_parts);
}
/* Fill in a "struct variant_part" for a given variant part. RESULT
is the variant part to fill in. OBSTACK is where any needed
allocations will be done. OFFSET_MAP holds the mapping from
section offsets to fields for the type. FI describes the fields of
the type we're processing. BUILDER is the variant part to be
converted. */
static void
create_one_variant_part (variant_part &result,
struct obstack *obstack,
const offset_map_type &offset_map,
struct field_info *fi,
const variant_part_builder &builder)
{
auto iter = offset_map.find (builder.discriminant_offset);
if (iter == offset_map.end ())
{
result.discriminant_index = -1;
/* Doesn't matter. */
result.is_unsigned = false;
}
else
{
result.discriminant_index = iter->second;
result.is_unsigned
= fi->fields[result.discriminant_index].field.type ()->is_unsigned ();
}
size_t n = builder.variants.size ();
variant *output = new (obstack) variant[n];
for (size_t i = 0; i < n; ++i)
create_one_variant (output[i], obstack, offset_map, fi,
builder.variants[i]);
result.variants = gdb::array_view<variant> (output, n);
}
/* Create a vector of variant parts that can be attached to a type.
OBSTACK is where any needed allocations will be done. OFFSET_MAP
holds the mapping from section offsets to fields for the type. FI
describes the fields of the type we're processing. VARIANT_PARTS
is the vector to convert. */
static const gdb::array_view<variant_part>
create_variant_parts (struct obstack *obstack,
const offset_map_type &offset_map,
struct field_info *fi,
const std::vector<variant_part_builder> &variant_parts)
{
if (variant_parts.empty ())
return {};
size_t n = variant_parts.size ();
variant_part *result = new (obstack) variant_part[n];
for (size_t i = 0; i < n; ++i)
create_one_variant_part (result[i], obstack, offset_map, fi,
variant_parts[i]);
return gdb::array_view<variant_part> (result, n);
}
/* Compute the variant part vector for FIP, attaching it to TYPE when
done. */
static void
add_variant_property (struct field_info *fip, struct type *type,
struct dwarf2_cu *cu)
{
/* Map section offsets of fields to their field index. Note the
field index here does not take the number of baseclasses into
account. */
offset_map_type offset_map;
for (int i = 0; i < fip->fields.size (); ++i)
offset_map[fip->fields[i].offset] = i;
struct objfile *objfile = cu->per_objfile->objfile;
gdb::array_view<variant_part> parts
= create_variant_parts (&objfile->objfile_obstack, offset_map, fip,
fip->variant_parts);
struct dynamic_prop prop;
prop.set_variant_parts ((gdb::array_view<variant_part> *)
obstack_copy (&objfile->objfile_obstack, &parts,
sizeof (parts)));
type->add_dyn_prop (DYN_PROP_VARIANT_PARTS, prop);
}
/* Create the vector of fields, and attach it to the type. */
static void
dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
struct dwarf2_cu *cu)
{
int nfields = fip->nfields ();
/* Record the field count, allocate space for the array of fields,
and create blank accessibility bitfields if necessary. */
type->set_num_fields (nfields);
type->set_fields
((struct field *) TYPE_ZALLOC (type, sizeof (struct field) * nfields));
if (fip->non_public_fields && cu->per_cu->lang != language_ada)
{
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_FIELD_PRIVATE_BITS (type) =
(B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
TYPE_FIELD_PROTECTED_BITS (type) =
(B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
TYPE_FIELD_IGNORE_BITS (type) =
(B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
}
/* If the type has baseclasses, allocate and clear a bit vector for
TYPE_FIELD_VIRTUAL_BITS. */
if (!fip->baseclasses.empty () && cu->per_cu->lang != language_ada)
{
int num_bytes = B_BYTES (fip->baseclasses.size ());
unsigned char *pointer;
ALLOCATE_CPLUS_STRUCT_TYPE (type);
pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
}
if (!fip->variant_parts.empty ())
add_variant_property (fip, type, cu);
/* Copy the saved-up fields into the field vector. */
for (int i = 0; i < nfields; ++i)
{
struct nextfield &field
= ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
: fip->fields[i - fip->baseclasses.size ()]);
type->field (i) = field.field;
switch (field.accessibility)
{
case DW_ACCESS_private:
if (cu->per_cu->lang != language_ada)
SET_TYPE_FIELD_PRIVATE (type, i);
break;
case DW_ACCESS_protected:
if (cu->per_cu->lang != language_ada)
SET_TYPE_FIELD_PROTECTED (type, i);
break;
case DW_ACCESS_public:
break;
default:
/* Unknown accessibility. Complain and treat it as public. */
{
complaint (_("unsupported accessibility %d"),
field.accessibility);
}
break;
}
if (i < fip->baseclasses.size ())
{
switch (field.virtuality)
{
case DW_VIRTUALITY_virtual:
case DW_VIRTUALITY_pure_virtual:
if (cu->per_cu->lang == language_ada)
error (_("unexpected virtuality in component of Ada type"));
SET_TYPE_FIELD_VIRTUAL (type, i);
break;
}
}
}
}
/* Return true if this member function is a constructor, false
otherwise. */
static int
dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
{
const char *fieldname;
const char *type_name;
int len;
if (die->parent == NULL)
return 0;
if (die->parent->tag != DW_TAG_structure_type
&& die->parent->tag != DW_TAG_union_type
&& die->parent->tag != DW_TAG_class_type)
return 0;
fieldname = dwarf2_name (die, cu);
type_name = dwarf2_name (die->parent, cu);
if (fieldname == NULL || type_name == NULL)
return 0;
len = strlen (fieldname);
return (strncmp (fieldname, type_name, len) == 0
&& (type_name[len] == '\0' || type_name[len] == '<'));
}
/* Add a member function to the proper fieldlist. */
static void
dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
struct type *type, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct attribute *attr;
int i;
struct fnfieldlist *flp = nullptr;
struct fn_field *fnp;
const char *fieldname;
struct type *this_type;
if (cu->per_cu->lang == language_ada)
error (_("unexpected member function in Ada type"));
/* Get name of member function. */
fieldname = dwarf2_name (die, cu);
if (fieldname == NULL)
return;
/* Look up member function name in fieldlist. */
for (i = 0; i < fip->fnfieldlists.size (); i++)
{
if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
{
flp = &fip->fnfieldlists[i];
break;
}
}
/* Create a new fnfieldlist if necessary. */
if (flp == nullptr)
{
fip->fnfieldlists.emplace_back ();
flp = &fip->fnfieldlists.back ();
flp->name = fieldname;
i = fip->fnfieldlists.size () - 1;
}
/* Create a new member function field and add it to the vector of
fnfieldlists. */
flp->fnfields.emplace_back ();
fnp = &flp->fnfields.back ();
/* Delay processing of the physname until later. */
if (cu->per_cu->lang == language_cplus)
add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
die, cu);
else
{
const char *physname = dwarf2_physname (fieldname, die, cu);
fnp->physname = physname ? physname : "";
}
fnp->type = alloc_type (objfile);
this_type = read_type_die (die, cu);
if (this_type && this_type->code () == TYPE_CODE_FUNC)
{
int nparams = this_type->num_fields ();
/* TYPE is the domain of this method, and THIS_TYPE is the type
of the method itself (TYPE_CODE_METHOD). */
smash_to_method_type (fnp->type, type,
TYPE_TARGET_TYPE (this_type),
this_type->fields (),
this_type->num_fields (),
this_type->has_varargs ());
/* Handle static member functions.
Dwarf2 has no clean way to discern C++ static and non-static
member functions. G++ helps GDB by marking the first
parameter for non-static member functions (which is the this
pointer) as artificial. We obtain this information from
read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
fnp->voffset = VOFFSET_STATIC;
}
else
complaint (_("member function type missing for '%s'"),
dwarf2_full_name (fieldname, die, cu));
/* Get fcontext from DW_AT_containing_type if present. */
if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
fnp->fcontext = die_containing_type (die, cu);
/* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
/* Get accessibility. */
dwarf_access_attribute accessibility = dwarf2_access_attribute (die, cu);
switch (accessibility)
{
case DW_ACCESS_private:
fnp->is_private = 1;
break;
case DW_ACCESS_protected:
fnp->is_protected = 1;
break;
}
/* Check for artificial methods. */
attr = dwarf2_attr (die, DW_AT_artificial, cu);
if (attr && attr->as_boolean ())
fnp->is_artificial = 1;
/* Check for defaulted methods. */
attr = dwarf2_attr (die, DW_AT_defaulted, cu);
if (attr != nullptr)
fnp->defaulted = attr->defaulted ();
/* Check for deleted methods. */
attr = dwarf2_attr (die, DW_AT_deleted, cu);
if (attr != nullptr && attr->as_boolean ())
fnp->is_deleted = 1;
fnp->is_constructor = dwarf2_is_constructor (die, cu);
/* Get index in virtual function table if it is a virtual member
function. For older versions of GCC, this is an offset in the
appropriate virtual table, as specified by DW_AT_containing_type.
For everyone else, it is an expression to be evaluated relative
to the object address. */
attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
if (attr != nullptr)
{
if (attr->form_is_block () && attr->as_block ()->size > 0)
{
struct dwarf_block *block = attr->as_block ();
if (block->data[0] == DW_OP_constu)
{
/* Old-style GCC. */
fnp->voffset = decode_locdesc (block, cu) + 2;
}
else if (block->data[0] == DW_OP_deref
|| (block->size > 1
&& block->data[0] == DW_OP_deref_size
&& block->data[1] == cu->header.addr_size))
{
fnp->voffset = decode_locdesc (block, cu);
if ((fnp->voffset % cu->header.addr_size) != 0)
dwarf2_complex_location_expr_complaint ();
else
fnp->voffset /= cu->header.addr_size;
fnp->voffset += 2;
}
else
dwarf2_complex_location_expr_complaint ();
if (!fnp->fcontext)
{
/* If there is no `this' field and no DW_AT_containing_type,
we cannot actually find a base class context for the
vtable! */
if (this_type->num_fields () == 0
|| !TYPE_FIELD_ARTIFICIAL (this_type, 0))
{
complaint (_("cannot determine context for virtual member "
"function \"%s\" (offset %s)"),
fieldname, sect_offset_str (die->sect_off));
}
else
{
fnp->fcontext
= TYPE_TARGET_TYPE (this_type->field (0).type ());
}
}
}
else if (attr->form_is_section_offset ())
{
dwarf2_complex_location_expr_complaint ();
}
else
{
dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
fieldname);
}
}
else
{
attr = dwarf2_attr (die, DW_AT_virtuality, cu);
if (attr != nullptr && attr->as_virtuality () != DW_VIRTUALITY_none)
{
/* GCC does this, as of 2008-08-25; PR debug/37237. */
complaint (_("Member function \"%s\" (offset %s) is virtual "
"but the vtable offset is not specified"),
fieldname, sect_offset_str (die->sect_off));
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_CPLUS_DYNAMIC (type) = 1;
}
}
}
/* Create the vector of member function fields, and attach it to the type. */
static void
dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
struct dwarf2_cu *cu)
{
if (cu->per_cu->lang == language_ada)
error (_("unexpected member functions in Ada type"));
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
TYPE_ALLOC (type,
sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
for (int i = 0; i < fip->fnfieldlists.size (); i++)
{
struct fnfieldlist &nf = fip->fnfieldlists[i];
struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
fn_flp->fn_fields = (struct fn_field *)
TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
for (int k = 0; k < nf.fnfields.size (); ++k)
fn_flp->fn_fields[k] = nf.fnfields[k];
}
TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
}
/* Returns non-zero if NAME is the name of a vtable member in CU's
language, zero otherwise. */
static int
is_vtable_name (const char *name, struct dwarf2_cu *cu)
{
static const char vptr[] = "_vptr";
/* Look for the C++ form of the vtable. */
if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
return 1;
return 0;
}
/* GCC outputs unnamed structures that are really pointers to member
functions, with the ABI-specified layout. If TYPE describes
such a structure, smash it into a member function type.
GCC shouldn't do this; it should just output pointer to member DIEs.
This is GCC PR debug/28767. */
static void
quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
{
struct type *pfn_type, *self_type, *new_type;
/* Check for a structure with no name and two children. */
if (type->code () != TYPE_CODE_STRUCT || type->num_fields () != 2)
return;
/* Check for __pfn and __delta members. */
if (TYPE_FIELD_NAME (type, 0) == NULL
|| strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
|| TYPE_FIELD_NAME (type, 1) == NULL
|| strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
return;
/* Find the type of the method. */
pfn_type = type->field (0).type ();
if (pfn_type == NULL
|| pfn_type->code () != TYPE_CODE_PTR
|| TYPE_TARGET_TYPE (pfn_type)->code () != TYPE_CODE_FUNC)
return;
/* Look for the "this" argument. */
pfn_type = TYPE_TARGET_TYPE (pfn_type);
if (pfn_type->num_fields () == 0
/* || pfn_type->field (0).type () == NULL */
|| pfn_type->field (0).type ()->code () != TYPE_CODE_PTR)
return;
self_type = TYPE_TARGET_TYPE (pfn_type->field (0).type ());
new_type = alloc_type (objfile);
smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
pfn_type->fields (), pfn_type->num_fields (),
pfn_type->has_varargs ());
smash_to_methodptr_type (type, new_type);
}
/* Helper for quirk_ada_thick_pointer. If TYPE is an array type that
requires rewriting, then copy it and return the updated copy.
Otherwise return nullptr. */
static struct type *
rewrite_array_type (struct type *type)
{
if (type->code () != TYPE_CODE_ARRAY)
return nullptr;
struct type *index_type = type->index_type ();
range_bounds *current_bounds = index_type->bounds ();
/* Handle multi-dimensional arrays. */
struct type *new_target = rewrite_array_type (TYPE_TARGET_TYPE (type));
if (new_target == nullptr)
{
/* Maybe we don't need to rewrite this array. */
if (current_bounds->low.kind () == PROP_CONST
&& current_bounds->high.kind () == PROP_CONST)
return nullptr;
}
/* Either the target type was rewritten, or the bounds have to be
updated. Either way we want to copy the type and update
everything. */
struct type *copy = copy_type (type);
int nfields = copy->num_fields ();
field *new_fields
= ((struct field *) TYPE_ZALLOC (copy,
nfields * sizeof (struct field)));
memcpy (new_fields, copy->fields (), nfields * sizeof (struct field));
copy->set_fields (new_fields);
if (new_target != nullptr)
TYPE_TARGET_TYPE (copy) = new_target;
struct type *index_copy = copy_type (index_type);
range_bounds *bounds
= (struct range_bounds *) TYPE_ZALLOC (index_copy,
sizeof (range_bounds));
*bounds = *current_bounds;
bounds->low.set_const_val (1);
bounds->high.set_const_val (0);
index_copy->set_bounds (bounds);
copy->set_index_type (index_copy);
return copy;
}
/* While some versions of GCC will generate complicated DWARF for an
array (see quirk_ada_thick_pointer), more recent versions were
modified to emit an explicit thick pointer structure. However, in
this case, the array still has DWARF expressions for its ranges,
and these must be ignored. */
static void
quirk_ada_thick_pointer_struct (struct die_info *die, struct dwarf2_cu *cu,
struct type *type)
{
gdb_assert (cu->per_cu->lang == language_ada);
/* Check for a structure with two children. */
if (type->code () != TYPE_CODE_STRUCT || type->num_fields () != 2)
return;
/* Check for P_ARRAY and P_BOUNDS members. */
if (TYPE_FIELD_NAME (type, 0) == NULL
|| strcmp (TYPE_FIELD_NAME (type, 0), "P_ARRAY") != 0
|| TYPE_FIELD_NAME (type, 1) == NULL
|| strcmp (TYPE_FIELD_NAME (type, 1), "P_BOUNDS") != 0)
return;
/* Make sure we're looking at a pointer to an array. */
if (type->field (0).type ()->code () != TYPE_CODE_PTR)
return;
/* The Ada code already knows how to handle these types, so all that
we need to do is turn the bounds into static bounds. However, we
don't want to rewrite existing array or index types in-place,
because those may be referenced in other contexts where this
rewriting is undesirable. */
struct type *new_ary_type
= rewrite_array_type (TYPE_TARGET_TYPE (type->field (0).type ()));
if (new_ary_type != nullptr)
type->field (0).set_type (lookup_pointer_type (new_ary_type));
}
/* If the DIE has a DW_AT_alignment attribute, return its value, doing
appropriate error checking and issuing complaints if there is a
problem. */
static ULONGEST
get_alignment (struct dwarf2_cu *cu, struct die_info *die)
{
struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu);
if (attr == nullptr)
return 0;
if (!attr->form_is_constant ())
{
complaint (_("DW_AT_alignment must have constant form"
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
return 0;
}
LONGEST val = attr->constant_value (0);
if (val < 0)
{
complaint (_("DW_AT_alignment value must not be negative"
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
return 0;
}
ULONGEST align = val;
if (align == 0)
{
complaint (_("DW_AT_alignment value must not be zero"
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
return 0;
}
if ((align & (align - 1)) != 0)
{
complaint (_("DW_AT_alignment value must be a power of 2"
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
return 0;
}
return align;
}
/* If the DIE has a DW_AT_alignment attribute, use its value to set
the alignment for TYPE. */
static void
maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die,
struct type *type)
{
if (!set_type_align (type, get_alignment (cu, die)))
complaint (_("DW_AT_alignment value too large"
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
}
/* Check if the given VALUE is a valid enum dwarf_calling_convention
constant for a type, according to DWARF5 spec, Table 5.5. */
static bool
is_valid_DW_AT_calling_convention_for_type (ULONGEST value)
{
switch (value)
{
case DW_CC_normal:
case DW_CC_pass_by_reference:
case DW_CC_pass_by_value:
return true;
default:
complaint (_("unrecognized DW_AT_calling_convention value "
"(%s) for a type"), pulongest (value));
return false;
}
}
/* Check if the given VALUE is a valid enum dwarf_calling_convention
constant for a subroutine, according to DWARF5 spec, Table 3.3, and
also according to GNU-specific values (see include/dwarf2.h). */
static bool
is_valid_DW_AT_calling_convention_for_subroutine (ULONGEST value)
{
switch (value)
{
case DW_CC_normal:
case DW_CC_program:
case DW_CC_nocall:
return true;
case DW_CC_GNU_renesas_sh:
case DW_CC_GNU_borland_fastcall_i386:
case DW_CC_GDB_IBM_OpenCL:
return true;
default:
complaint (_("unrecognized DW_AT_calling_convention value "
"(%s) for a subroutine"), pulongest (value));
return false;
}
}
/* Called when we find the DIE that starts a structure or union scope
(definition) to create a type for the structure or union. Fill in
the type's name and general properties; the members will not be
processed until process_structure_scope. A symbol table entry for
the type will also not be done until process_structure_scope (assuming
the type has a name).
NOTE: we need to call these functions regardless of whether or not the
DIE has a DW_AT_name attribute, since it might be an anonymous
structure or union. This gets the type entered into our set of
user defined types. */
static struct type *
read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct type *type;
struct attribute *attr;
const char *name;
/* If the definition of this type lives in .debug_types, read that type.
Don't follow DW_AT_specification though, that will take us back up
the chain and we want to go down. */
attr = die->attr (DW_AT_signature);
if (attr != nullptr)
{
type = get_DW_AT_signature_type (die, attr, cu);
/* The type's CU may not be the same as CU.
Ensure TYPE is recorded with CU in die_type_hash. */
return set_die_type (die, type, cu);
}
type = alloc_type (objfile);
INIT_CPLUS_SPECIFIC (type);
name = dwarf2_name (die, cu);
if (name != NULL)
{
if (cu->per_cu->lang == language_cplus
|| cu->per_cu->lang == language_d
|| cu->per_cu->lang == language_rust)
{
const char *full_name = dwarf2_full_name (name, die, cu);
/* dwarf2_full_name might have already finished building the DIE's
type. If so, there is no need to continue. */
if (get_die_type (die, cu) != NULL)
return get_die_type (die, cu);
type->set_name (full_name);
}
else
{
/* The name is already allocated along with this objfile, so
we don't need to duplicate it for the type. */
type->set_name (name);
}
}
if (die->tag == DW_TAG_structure_type)
{
type->set_code (TYPE_CODE_STRUCT);
}
else if (die->tag == DW_TAG_union_type)
{
type->set_code (TYPE_CODE_UNION);
}
else
{
type->set_code (TYPE_CODE_STRUCT);
}
if (cu->per_cu->lang == language_cplus && die->tag == DW_TAG_class_type)
type->set_is_declared_class (true);
/* Store the calling convention in the type if it's available in
the die. Otherwise the calling convention remains set to
the default value DW_CC_normal. */
attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
if (attr != nullptr
&& is_valid_DW_AT_calling_convention_for_type (attr->constant_value (0)))
{
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_CPLUS_CALLING_CONVENTION (type)
= (enum dwarf_calling_convention) (attr->constant_value (0));
}
attr = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr != nullptr)
{
if (attr->form_is_constant ())
TYPE_LENGTH (type) = attr->constant_value (0);
else
{
struct dynamic_prop prop;
if (attr_to_dynamic_prop (attr, die, cu, &prop, cu->addr_type ()))
type->add_dyn_prop (DYN_PROP_BYTE_SIZE, prop);
TYPE_LENGTH (type) = 0;
}
}
else
{
TYPE_LENGTH (type) = 0;
}
maybe_set_alignment (cu, die, type);
if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
{
/* ICC<14 does not output the required DW_AT_declaration on
incomplete types, but gives them a size of zero. */
type->set_is_stub (true);
}
else
type->set_stub_is_supported (true);
if (die_is_declaration (die, cu))
type->set_is_stub (true);
else if (attr == NULL && die->child == NULL
&& producer_is_realview (cu->producer))
/* RealView does not output the required DW_AT_declaration
on incomplete types. */
type->set_is_stub (true);
/* We need to add the type field to the die immediately so we don't
infinitely recurse when dealing with pointers to the structure
type within the structure itself. */
set_die_type (die, type, cu);
/* set_die_type should be already done. */
set_descriptive_type (type, die, cu);
return type;
}
static void handle_struct_member_die
(struct die_info *child_die,
struct type *type,
struct field_info *fi,
std::vector<struct symbol *> *template_args,
struct dwarf2_cu *cu);
/* A helper for handle_struct_member_die that handles
DW_TAG_variant_part. */
static void
handle_variant_part (struct die_info *die, struct type *type,
struct field_info *fi,
std::vector<struct symbol *> *template_args,
struct dwarf2_cu *cu)
{
variant_part_builder *new_part;
if (fi->current_variant_part == nullptr)
{
fi->variant_parts.emplace_back ();
new_part = &fi->variant_parts.back ();
}
else if (!fi->current_variant_part->processing_variant)
{
complaint (_("nested DW_TAG_variant_part seen "
"- DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
return;
}
else
{
variant_field &current = fi->current_variant_part->variants.back ();
current.variant_parts.emplace_back ();
new_part = &current.variant_parts.back ();
}
/* When we recurse, we want callees to add to this new variant
part. */
scoped_restore save_current_variant_part
= make_scoped_restore (&fi->current_variant_part, new_part);
struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
if (discr == NULL)
{
/* It's a univariant form, an extension we support. */
}
else if (discr->form_is_ref ())
{
struct dwarf2_cu *target_cu = cu;
struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
new_part->discriminant_offset = target_die->sect_off;
}
else
{
complaint (_("DW_AT_discr does not have DIE reference form"
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
}
for (die_info *child_die = die->child;
child_die != NULL;
child_die = child_die->sibling)
handle_struct_member_die (child_die, type, fi, template_args, cu);
}
/* A helper for handle_struct_member_die that handles
DW_TAG_variant. */
static void
handle_variant (struct die_info *die, struct type *type,
struct field_info *fi,
std::vector<struct symbol *> *template_args,
struct dwarf2_cu *cu)
{
if (fi->current_variant_part == nullptr)
{
complaint (_("saw DW_TAG_variant outside DW_TAG_variant_part "
"- DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
return;
}
if (fi->current_variant_part->processing_variant)
{
complaint (_("nested DW_TAG_variant seen "
"- DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
return;
}
scoped_restore save_processing_variant
= make_scoped_restore (&fi->current_variant_part->processing_variant,
true);
fi->current_variant_part->variants.emplace_back ();
variant_field &variant = fi->current_variant_part->variants.back ();
variant.first_field = fi->fields.size ();
/* In a variant we want to get the discriminant and also add a
field for our sole member child. */
struct attribute *discr = dwarf2_attr (die, DW_AT_discr_value, cu);
if (discr == nullptr || !discr->form_is_constant ())
{
discr = dwarf2_attr (die, DW_AT_discr_list, cu);
if (discr == nullptr || discr->as_block ()->size == 0)
variant.default_branch = true;
else
variant.discr_list_data = discr->as_block ();
}
else
variant.discriminant_value = discr->constant_value (0);
for (die_info *variant_child = die->child;
variant_child != NULL;
variant_child = variant_child->sibling)
handle_struct_member_die (variant_child, type, fi, template_args, cu);
variant.last_field = fi->fields.size ();
}
/* A helper for process_structure_scope that handles a single member
DIE. */
static void
handle_struct_member_die (struct die_info *child_die, struct type *type,
struct field_info *fi,
std::vector<struct symbol *> *template_args,
struct dwarf2_cu *cu)
{
if (child_die->tag == DW_TAG_member
|| child_die->tag == DW_TAG_variable)
{
/* NOTE: carlton/2002-11-05: A C++ static data member
should be a DW_TAG_member that is a declaration, but
all versions of G++ as of this writing (so through at
least 3.2.1) incorrectly generate DW_TAG_variable
tags for them instead. */
dwarf2_add_field (fi, child_die, cu);
}
else if (child_die->tag == DW_TAG_subprogram)
{
/* Rust doesn't have member functions in the C++ sense.
However, it does emit ordinary functions as children
of a struct DIE. */
if (cu->per_cu->lang == language_rust)
read_func_scope (child_die, cu);
else
{
/* C++ member function. */
dwarf2_add_member_fn (fi, child_die, type, cu);
}
}
else if (child_die->tag == DW_TAG_inheritance)
{
/* C++ base class field. */
dwarf2_add_field (fi, child_die, cu);
}
else if (type_can_define_types (child_die))
dwarf2_add_type_defn (fi, child_die, cu);
else if (child_die->tag == DW_TAG_template_type_param
|| child_die->tag == DW_TAG_template_value_param)
{
struct symbol *arg = new_symbol (child_die, NULL, cu);
if (arg != NULL)
template_args->push_back (arg);
}
else if (child_die->tag == DW_TAG_variant_part)
handle_variant_part (child_die, type, fi, template_args, cu);
else if (child_die->tag == DW_TAG_variant)
handle_variant (child_die, type, fi, template_args, cu);
}
/* Finish creating a structure or union type, including filling in
its members and creating a symbol for it. */
static void
process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct die_info *child_die;
struct type *type;
type = get_die_type (die, cu);
if (type == NULL)
type = read_structure_type (die, cu);
bool has_template_parameters = false;
if (die->child != NULL && ! die_is_declaration (die, cu))
{
struct field_info fi;
std::vector<struct symbol *> template_args;
child_die = die->child;
while (child_die && child_die->tag)
{
handle_struct_member_die (child_die, type, &fi, &template_args, cu);
child_die = child_die->sibling;
}
/* Attach template arguments to type. */
if (!template_args.empty ())
{
has_template_parameters = true;
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
TYPE_TEMPLATE_ARGUMENTS (type)
= XOBNEWVEC (&objfile->objfile_obstack,
struct symbol *,
TYPE_N_TEMPLATE_ARGUMENTS (type));
memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
template_args.data (),
(TYPE_N_TEMPLATE_ARGUMENTS (type)
* sizeof (struct symbol *)));
}
/* Attach fields and member functions to the type. */
if (fi.nfields () > 0)
dwarf2_attach_fields_to_type (&fi, type, cu);
if (!fi.fnfieldlists.empty ())
{
dwarf2_attach_fn_fields_to_type (&fi, type, cu);
/* Get the type which refers to the base class (possibly this
class itself) which contains the vtable pointer for the current
class from the DW_AT_containing_type attribute. This use of
DW_AT_containing_type is a GNU extension. */
if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
{
struct type *t = die_containing_type (die, cu);
set_type_vptr_basetype (type, t);
if (type == t)
{
int i;
/* Our own class provides vtbl ptr. */
for (i = t->num_fields () - 1;
i >= TYPE_N_BASECLASSES (t);
--i)
{
const char *fieldname = TYPE_FIELD_NAME (t, i);
if (is_vtable_name (fieldname, cu))
{
set_type_vptr_fieldno (type, i);
break;
}
}
/* Complain if virtual function table field not found. */
if (i < TYPE_N_BASECLASSES (t))
complaint (_("virtual function table pointer "
"not found when defining class '%s'"),
type->name () ? type->name () : "");
}
else
{
set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
}
}
else if (cu->producer
&& startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
{
/* The IBM XLC compiler does not provide direct indication
of the containing type, but the vtable pointer is
always named __vfp. */
int i;
for (i = type->num_fields () - 1;
i >= TYPE_N_BASECLASSES (type);
--i)
{
if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
{
set_type_vptr_fieldno (type, i);
set_type_vptr_basetype (type, type);
break;
}
}
}
}
/* Copy fi.typedef_field_list linked list elements content into the
allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
if (!fi.typedef_field_list.empty ())
{
int count = fi.typedef_field_list.size ();
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_TYPEDEF_FIELD_ARRAY (type)
= ((struct decl_field *)
TYPE_ALLOC (type,
sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
TYPE_TYPEDEF_FIELD_COUNT (type) = count;
for (int i = 0; i < fi.typedef_field_list.size (); ++i)
TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
}
/* Copy fi.nested_types_list linked list elements content into the
allocated array TYPE_NESTED_TYPES_ARRAY (type). */
if (!fi.nested_types_list.empty ()
&& cu->per_cu->lang != language_ada)
{
int count = fi.nested_types_list.size ();
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_NESTED_TYPES_ARRAY (type)
= ((struct decl_field *)
TYPE_ALLOC (type, sizeof (struct decl_field) * count));
TYPE_NESTED_TYPES_COUNT (type) = count;
for (int i = 0; i < fi.nested_types_list.size (); ++i)
TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
}
}
quirk_gcc_member_function_pointer (type, objfile);
if (cu->per_cu->lang == language_rust && die->tag == DW_TAG_union_type)
cu->rust_unions.push_back (type);
else if (cu->per_cu->lang == language_ada)
quirk_ada_thick_pointer_struct (die, cu, type);
/* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
snapshots) has been known to create a die giving a declaration
for a class that has, as a child, a die giving a definition for a
nested class. So we have to process our children even if the
current die is a declaration. Normally, of course, a declaration
won't have any children at all. */
child_die = die->child;
while (child_die != NULL && child_die->tag)
{
if (child_die->tag == DW_TAG_member
|| child_die->tag == DW_TAG_variable
|| child_die->tag == DW_TAG_inheritance
|| child_die->tag == DW_TAG_template_value_param
|| child_die->tag == DW_TAG_template_type_param)
{
/* Do nothing. */
}
else
process_die (child_die, cu);
child_die = child_die->sibling;
}
/* Do not consider external references. According to the DWARF standard,
these DIEs are identified by the fact that they have no byte_size
attribute, and a declaration attribute. */
if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
|| !die_is_declaration (die, cu)
|| dwarf2_attr (die, DW_AT_signature, cu) != NULL)
{
struct symbol *sym = new_symbol (die, type, cu);
if (has_template_parameters)
{
struct symtab *symtab;
if (sym != nullptr)
symtab = symbol_symtab (sym);
else if (cu->line_header != nullptr)
{
/* Any related symtab will do. */
symtab
= cu->line_header->file_names ()[0].symtab;
}
else
{
symtab = nullptr;
complaint (_("could not find suitable "
"symtab for template parameter"
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (objfile));
}
if (symtab != nullptr)
{
/* Make sure that the symtab is set on the new symbols.
Even though they don't appear in this symtab directly,
other parts of gdb assume that symbols do, and this is
reasonably true. */
for (int i = 0; i < TYPE_N_TEMPLATE_ARGUMENTS (type); ++i)
symbol_set_symtab (TYPE_TEMPLATE_ARGUMENT (type, i), symtab);
}
}
}
}
/* Assuming DIE is an enumeration type, and TYPE is its associated
type, update TYPE using some information only available in DIE's
children. In particular, the fields are computed. */
static void
update_enumeration_type_from_children (struct die_info *die,
struct type *type,
struct dwarf2_cu *cu)
{
struct die_info *child_die;
int unsigned_enum = 1;
int flag_enum = 1;
auto_obstack obstack;
std::vector<struct field> fields;
for (child_die = die->child;
child_die != NULL && child_die->tag;
child_die = child_die->sibling)
{
struct attribute *attr;
LONGEST value;
const gdb_byte *bytes;
struct dwarf2_locexpr_baton *baton;
const char *name;
if (child_die->tag != DW_TAG_enumerator)
continue;
attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
if (attr == NULL)
continue;
name = dwarf2_name (child_die, cu);
if (name == NULL)
name = "<anonymous enumerator>";
dwarf2_const_value_attr (attr, type, name, &obstack, cu,
&value, &bytes, &baton);
if (value < 0)
{
unsigned_enum = 0;
flag_enum = 0;
}
else
{
if (count_one_bits_ll (value) >= 2)
flag_enum = 0;
}
fields.emplace_back ();
struct field &field = fields.back ();
FIELD_NAME (field) = dwarf2_physname (name, child_die, cu);
SET_FIELD_ENUMVAL (field, value);
}
if (!fields.empty ())
{
type->set_num_fields (fields.size ());
type->set_fields
((struct field *)
TYPE_ALLOC (type, sizeof (struct field) * fields.size ()));
memcpy (type->fields (), fields.data (),
sizeof (struct field) * fields.size ());
}
if (unsigned_enum)
type->set_is_unsigned (true);
if (flag_enum)
type->set_is_flag_enum (true);
}
/* Given a DW_AT_enumeration_type die, set its type. We do not
complete the type's fields yet, or create any symbols. */
static struct type *
read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct type *type;
struct attribute *attr;
const char *name;
/* If the definition of this type lives in .debug_types, read that type.
Don't follow DW_AT_specification though, that will take us back up
the chain and we want to go down. */
attr = die->attr (DW_AT_signature);
if (attr != nullptr)
{
type = get_DW_AT_signature_type (die, attr, cu);
/* The type's CU may not be the same as CU.
Ensure TYPE is recorded with CU in die_type_hash. */
return set_die_type (die, type, cu);
}
type = alloc_type (objfile);
type->set_code (TYPE_CODE_ENUM);
name = dwarf2_full_name (NULL, die, cu);
if (name != NULL)
type->set_name (name);
attr = dwarf2_attr (die, DW_AT_type, cu);
if (attr != NULL)
{
struct type *underlying_type = die_type (die, cu);
TYPE_TARGET_TYPE (type) = underlying_type;
}
attr = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr != nullptr)
{
TYPE_LENGTH (type) = attr->constant_value (0);
}
else
{
TYPE_LENGTH (type) = 0;
}
maybe_set_alignment (cu, die, type);
/* The enumeration DIE can be incomplete. In Ada, any type can be
declared as private in the package spec, and then defined only
inside the package body. Such types are known as Taft Amendment
Types. When another package uses such a type, an incomplete DIE
may be generated by the compiler. */
if (die_is_declaration (die, cu))
type->set_is_stub (true);
/* If this type has an underlying type that is not a stub, then we
may use its attributes. We always use the "unsigned" attribute
in this situation, because ordinarily we guess whether the type
is unsigned -- but the guess can be wrong and the underlying type
can tell us the reality. However, we defer to a local size
attribute if one exists, because this lets the compiler override
the underlying type if needed. */
if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_TARGET_TYPE (type)->is_stub ())
{
struct type *underlying_type = TYPE_TARGET_TYPE (type);
underlying_type = check_typedef (underlying_type);
type->set_is_unsigned (underlying_type->is_unsigned ());
if (TYPE_LENGTH (type) == 0)
TYPE_LENGTH (type) = TYPE_LENGTH (underlying_type);
if (TYPE_RAW_ALIGN (type) == 0
&& TYPE_RAW_ALIGN (underlying_type) != 0)
set_type_align (type, TYPE_RAW_ALIGN (underlying_type));
}
type->set_is_declared_class (dwarf2_flag_true_p (die, DW_AT_enum_class, cu));
set_die_type (die, type, cu);
/* Finish the creation of this type by using the enum's children.
Note that, as usual, this must come after set_die_type to avoid
infinite recursion when trying to compute the names of the
enumerators. */
update_enumeration_type_from_children (die, type, cu);
return type;
}
/* Given a pointer to a die which begins an enumeration, process all
the dies that define the members of the enumeration, and create the
symbol for the enumeration type.
NOTE: We reverse the order of the element list. */
static void
process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *this_type;
this_type = get_die_type (die, cu);
if (this_type == NULL)
this_type = read_enumeration_type (die, cu);
if (die->child != NULL)
{
struct die_info *child_die;
const char *name;
child_die = die->child;
while (child_die && child_die->tag)
{
if (child_die->tag != DW_TAG_enumerator)
{
process_die (child_die, cu);
}
else
{
name = dwarf2_name (child_die, cu);
if (name)
new_symbol (child_die, this_type, cu);
}
child_die = child_die->sibling;
}
}
/* If we are reading an enum from a .debug_types unit, and the enum
is a declaration, and the enum is not the signatured type in the
unit, then we do not want to add a symbol for it. Adding a
symbol would in some cases obscure the true definition of the
enum, giving users an incomplete type when the definition is
actually available. Note that we do not want to do this for all
enums which are just declarations, because C++0x allows forward
enum declarations. */
if (cu->per_cu->is_debug_types
&& die_is_declaration (die, cu))
{
struct signatured_type *sig_type;
sig_type = (struct signatured_type *) cu->per_cu;
gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
if (sig_type->type_offset_in_section != die->sect_off)
return;
}
new_symbol (die, this_type, cu);
}
/* Helper function for quirk_ada_thick_pointer that examines a bounds
expression for an index type and finds the corresponding field
offset in the hidden "P_BOUNDS" structure. Returns true on success
and updates *FIELD, false if it fails to recognize an
expression. */
static bool
recognize_bound_expression (struct die_info *die, enum dwarf_attribute name,
int *bounds_offset, struct field *field,
struct dwarf2_cu *cu)
{
struct attribute *attr = dwarf2_attr (die, name, cu);
if (attr == nullptr || !attr->form_is_block ())
return false;
const struct dwarf_block *block = attr->as_block ();
const gdb_byte *start = block->data;
const gdb_byte *end = block->data + block->size;
/* The expression to recognize generally looks like:
(DW_OP_push_object_address; DW_OP_plus_uconst: 8; DW_OP_deref;
DW_OP_plus_uconst: 4; DW_OP_deref_size: 4)
However, the second "plus_uconst" may be missing:
(DW_OP_push_object_address; DW_OP_plus_uconst: 8; DW_OP_deref;
DW_OP_deref_size: 4)
This happens when the field is at the start of the structure.
Also, the final deref may not be sized:
(DW_OP_push_object_address; DW_OP_plus_uconst: 4; DW_OP_deref;
DW_OP_deref)
This happens when the size of the index type happens to be the
same as the architecture's word size. This can occur with or
without the second plus_uconst. */
if (end - start < 2)
return false;
if (*start++ != DW_OP_push_object_address)
return false;
if (*start++ != DW_OP_plus_uconst)
return false;
uint64_t this_bound_off;
start = gdb_read_uleb128 (start, end, &this_bound_off);
if (start == nullptr || (int) this_bound_off != this_bound_off)
return false;
/* Update *BOUNDS_OFFSET if needed, or alternatively verify that it
is consistent among all bounds. */
if (*bounds_offset == -1)
*bounds_offset = this_bound_off;
else if (*bounds_offset != this_bound_off)
return false;
if (start == end || *start++ != DW_OP_deref)
return false;
int offset = 0;
if (start ==end)
return false;
else if (*start == DW_OP_deref_size || *start == DW_OP_deref)
{
/* This means an offset of 0. */
}
else if (*start++ != DW_OP_plus_uconst)
return false;
else
{
/* The size is the parameter to DW_OP_plus_uconst. */
uint64_t val;
start = gdb_read_uleb128 (start, end, &val);
if (start == nullptr)
return false;
if ((int) val != val)
return false;
offset = val;
}
if (start == end)
return false;
uint64_t size;
if (*start == DW_OP_deref_size)
{
start = gdb_read_uleb128 (start + 1, end, &size);
if (start == nullptr)
return false;
}
else if (*start == DW_OP_deref)
{
size = cu->header.addr_size;
++start;
}
else
return false;
SET_FIELD_BITPOS (*field, 8 * offset);
if (size != TYPE_LENGTH (field->type ()))
FIELD_BITSIZE (*field) = 8 * size;
return true;
}
/* With -fgnat-encodings=minimal, gcc will emit some unusual DWARF for
some kinds of Ada arrays:
<1><11db>: Abbrev Number: 7 (DW_TAG_array_type)
<11dc> DW_AT_name : (indirect string, offset: 0x1bb8): string
<11e0> DW_AT_data_location: 2 byte block: 97 6
(DW_OP_push_object_address; DW_OP_deref)
<11e3> DW_AT_type : <0x1173>
<11e7> DW_AT_sibling : <0x1201>
<2><11eb>: Abbrev Number: 8 (DW_TAG_subrange_type)
<11ec> DW_AT_type : <0x1206>
<11f0> DW_AT_lower_bound : 6 byte block: 97 23 8 6 94 4
(DW_OP_push_object_address; DW_OP_plus_uconst: 8; DW_OP_deref;
DW_OP_deref_size: 4)
<11f7> DW_AT_upper_bound : 8 byte block: 97 23 8 6 23 4 94 4
(DW_OP_push_object_address; DW_OP_plus_uconst: 8; DW_OP_deref;
DW_OP_plus_uconst: 4; DW_OP_deref_size: 4)
This actually represents a "thick pointer", which is a structure
with two elements: one that is a pointer to the array data, and one
that is a pointer to another structure; this second structure holds
the array bounds.
This returns a new type on success, or nullptr if this didn't
recognize the type. */
static struct type *
quirk_ada_thick_pointer (struct die_info *die, struct dwarf2_cu *cu,
struct type *type)
{
struct attribute *attr = dwarf2_attr (die, DW_AT_data_location, cu);
/* So far we've only seen this with block form. */
if (attr == nullptr || !attr->form_is_block ())
return nullptr;
/* Note that this will fail if the structure layout is changed by
the compiler. However, we have no good way to recognize some
other layout, because we don't know what expression the compiler
might choose to emit should this happen. */
struct dwarf_block *blk = attr->as_block ();
if (blk->size != 2
|| blk->data[0] != DW_OP_push_object_address
|| blk->data[1] != DW_OP_deref)
return nullptr;
int bounds_offset = -1;
int max_align = -1;
std::vector<struct field> range_fields;
for (struct die_info *child_die = die->child;
child_die;
child_die = child_die->sibling)
{
if (child_die->tag == DW_TAG_subrange_type)
{
struct type *underlying = read_subrange_index_type (child_die, cu);
int this_align = type_align (underlying);
if (this_align > max_align)
max_align = this_align;
range_fields.emplace_back ();
range_fields.emplace_back ();
struct field &lower = range_fields[range_fields.size () - 2];
struct field &upper = range_fields[range_fields.size () - 1];
lower.set_type (underlying);
FIELD_ARTIFICIAL (lower) = 1;
upper.set_type (underlying);
FIELD_ARTIFICIAL (upper) = 1;
if (!recognize_bound_expression (child_die, DW_AT_lower_bound,
&bounds_offset, &lower, cu)
|| !recognize_bound_expression (child_die, DW_AT_upper_bound,
&bounds_offset, &upper, cu))
return nullptr;
}
}
/* This shouldn't really happen, but double-check that we found
where the bounds are stored. */
if (bounds_offset == -1)
return nullptr;
struct objfile *objfile = cu->per_objfile->objfile;
for (int i = 0; i < range_fields.size (); i += 2)
{
char name[20];
/* Set the name of each field in the bounds. */
xsnprintf (name, sizeof (name), "LB%d", i / 2);
FIELD_NAME (range_fields[i]) = objfile->intern (name);
xsnprintf (name, sizeof (name), "UB%d", i / 2);
FIELD_NAME (range_fields[i + 1]) = objfile->intern (name);
}
struct type *bounds = alloc_type (objfile);
bounds->set_code (TYPE_CODE_STRUCT);
bounds->set_num_fields (range_fields.size ());
bounds->set_fields
((struct field *) TYPE_ALLOC (bounds, (bounds->num_fields ()
* sizeof (struct field))));
memcpy (bounds->fields (), range_fields.data (),
bounds->num_fields () * sizeof (struct field));
int last_fieldno = range_fields.size () - 1;
int bounds_size = (TYPE_FIELD_BITPOS (bounds, last_fieldno) / 8
+ TYPE_LENGTH (bounds->field (last_fieldno).type ()));
TYPE_LENGTH (bounds) = align_up (bounds_size, max_align);
/* Rewrite the existing array type in place. Specifically, we
remove any dynamic properties we might have read, and we replace
the index types. */
struct type *iter = type;
for (int i = 0; i < range_fields.size (); i += 2)
{
gdb_assert (iter->code () == TYPE_CODE_ARRAY);
iter->main_type->dyn_prop_list = nullptr;
iter->set_index_type
(create_static_range_type (NULL, bounds->field (i).type (), 1, 0));
iter = TYPE_TARGET_TYPE (iter);
}
struct type *result = alloc_type (objfile);
result->set_code (TYPE_CODE_STRUCT);
result->set_num_fields (2);
result->set_fields
((struct field *) TYPE_ZALLOC (result, (result->num_fields ()
* sizeof (struct field))));
/* The names are chosen to coincide with what the compiler does with
-fgnat-encodings=all, which the Ada code in gdb already
understands. */
TYPE_FIELD_NAME (result, 0) = "P_ARRAY";
result->field (0).set_type (lookup_pointer_type (type));
TYPE_FIELD_NAME (result, 1) = "P_BOUNDS";
result->field (1).set_type (lookup_pointer_type (bounds));
SET_FIELD_BITPOS (result->field (1), 8 * bounds_offset);
result->set_name (type->name ());
TYPE_LENGTH (result) = (TYPE_LENGTH (result->field (0).type ())
+ TYPE_LENGTH (result->field (1).type ()));
return result;
}
/* Extract all information from a DW_TAG_array_type DIE and put it in
the DIE's type field. For now, this only handles one dimensional
arrays. */
static struct type *
read_array_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct die_info *child_die;
struct type *type;
struct type *element_type, *range_type, *index_type;
struct attribute *attr;
const char *name;
struct dynamic_prop *byte_stride_prop = NULL;
unsigned int bit_stride = 0;
element_type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
type = get_die_type (die, cu);
if (type)
return type;
attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
if (attr != NULL)
{
int stride_ok;
struct type *prop_type = cu->addr_sized_int_type (false);
byte_stride_prop
= (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop,
prop_type);
if (!stride_ok)
{
complaint (_("unable to read array DW_AT_byte_stride "
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
/* Ignore this attribute. We will likely not be able to print
arrays of this type correctly, but there is little we can do
to help if we cannot read the attribute's value. */
byte_stride_prop = NULL;
}
}
attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
if (attr != NULL)
bit_stride = attr->constant_value (0);
/* Irix 6.2 native cc creates array types without children for
arrays with unspecified length. */
if (die->child == NULL)
{
index_type = objfile_type (objfile)->builtin_int;
range_type = create_static_range_type (NULL, index_type, 0, -1);
type = create_array_type_with_stride (NULL, element_type, range_type,
byte_stride_prop, bit_stride);
return set_die_type (die, type, cu);
}
std::vector<struct type *> range_types;
child_die = die->child;
while (child_die && child_die->tag)
{
if (child_die->tag == DW_TAG_subrange_type)
{
struct type *child_type = read_type_die (child_die, cu);
if (child_type != NULL)
{
/* The range type was succesfully read. Save it for the
array type creation. */
range_types.push_back (child_type);
}
}
child_die = child_die->sibling;
}
if (range_types.empty ())
{
complaint (_("unable to find array range - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
return NULL;
}
/* Dwarf2 dimensions are output from left to right, create the
necessary array types in backwards order. */
type = element_type;
if (read_array_order (die, cu) == DW_ORD_col_major)
{
int i = 0;
while (i < range_types.size ())
{
type = create_array_type_with_stride (NULL, type, range_types[i++],
byte_stride_prop, bit_stride);
bit_stride = 0;
byte_stride_prop = nullptr;
}
}
else
{
size_t ndim = range_types.size ();
while (ndim-- > 0)
{
type = create_array_type_with_stride (NULL, type, range_types[ndim],
byte_stride_prop, bit_stride);
bit_stride = 0;
byte_stride_prop = nullptr;
}
}
gdb_assert (type != element_type);
/* Understand Dwarf2 support for vector types (like they occur on
the PowerPC w/ AltiVec). Gcc just adds another attribute to the
array type. This is not part of the Dwarf2/3 standard yet, but a
custom vendor extension. The main difference between a regular
array and the vector variant is that vectors are passed by value
to functions. */
attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
if (attr != nullptr)
make_vector_type (type);
/* The DIE may have DW_AT_byte_size set. For example an OpenCL
implementation may choose to implement triple vectors using this
attribute. */
attr = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr != nullptr && attr->form_is_unsigned ())
{
if (attr->as_unsigned () >= TYPE_LENGTH (type))
TYPE_LENGTH (type) = attr->as_unsigned ();
else
complaint (_("DW_AT_byte_size for array type smaller "
"than the total size of elements"));
}
name = dwarf2_name (die, cu);
if (name)
type->set_name (name);
maybe_set_alignment (cu, die, type);
struct type *replacement_type = nullptr;
if (cu->per_cu->lang == language_ada)
{
replacement_type = quirk_ada_thick_pointer (die, cu, type);
if (replacement_type != nullptr)
type = replacement_type;
}
/* Install the type in the die. */
set_die_type (die, type, cu, replacement_type != nullptr);
/* set_die_type should be already done. */
set_descriptive_type (type, die, cu);
return type;
}
static enum dwarf_array_dim_ordering
read_array_order (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_ordering, cu);
if (attr != nullptr)
{
LONGEST val = attr->constant_value (-1);
if (val == DW_ORD_row_major || val == DW_ORD_col_major)
return (enum dwarf_array_dim_ordering) val;
}
/* GNU F77 is a special case, as at 08/2004 array type info is the
opposite order to the dwarf2 specification, but data is still
laid out as per normal fortran.
FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
version checking. */
if (cu->per_cu->lang == language_fortran
&& cu->producer && strstr (cu->producer, "GNU F77"))
{
return DW_ORD_row_major;
}
switch (cu->language_defn->array_ordering ())
{
case array_column_major:
return DW_ORD_col_major;
case array_row_major:
default:
return DW_ORD_row_major;
};
}
/* Extract all information from a DW_TAG_set_type DIE and put it in
the DIE's type field. */
static struct type *
read_set_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *domain_type, *set_type;
struct attribute *attr;
domain_type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
set_type = get_die_type (die, cu);
if (set_type)
return set_type;
set_type = create_set_type (NULL, domain_type);
attr = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr != nullptr && attr->form_is_unsigned ())
TYPE_LENGTH (set_type) = attr->as_unsigned ();
maybe_set_alignment (cu, die, set_type);
return set_die_type (die, set_type, cu);
}
/* A helper for read_common_block that creates a locexpr baton.
SYM is the symbol which we are marking as computed.
COMMON_DIE is the DIE for the common block.
COMMON_LOC is the location expression attribute for the common
block itself.
MEMBER_LOC is the location expression attribute for the particular
member of the common block that we are processing.
CU is the CU from which the above come. */
static void
mark_common_block_symbol_computed (struct symbol *sym,
struct die_info *common_die,
struct attribute *common_loc,
struct attribute *member_loc,
struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct dwarf2_locexpr_baton *baton;
gdb_byte *ptr;
unsigned int cu_off;
enum bfd_endian byte_order = gdbarch_byte_order (objfile->arch ());
LONGEST offset = 0;
gdb_assert (common_loc && member_loc);
gdb_assert (common_loc->form_is_block ());
gdb_assert (member_loc->form_is_block ()
|| member_loc->form_is_constant ());
baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
baton->per_objfile = per_objfile;
baton->per_cu = cu->per_cu;
gdb_assert (baton->per_cu);
baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
if (member_loc->form_is_constant ())
{
offset = member_loc->constant_value (0);
baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
}
else
baton->size += member_loc->as_block ()->size;
ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
baton->data = ptr;
*ptr++ = DW_OP_call4;
cu_off = common_die->sect_off - cu->per_cu->sect_off;
store_unsigned_integer (ptr, 4, byte_order, cu_off);
ptr += 4;
if (member_loc->form_is_constant ())
{
*ptr++ = DW_OP_addr;
store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
ptr += cu->header.addr_size;
}
else
{
/* We have to copy the data here, because DW_OP_call4 will only
use a DW_AT_location attribute. */
struct dwarf_block *block = member_loc->as_block ();
memcpy (ptr, block->data, block->size);
ptr += block->size;
}
*ptr++ = DW_OP_plus;
gdb_assert (ptr - baton->data == baton->size);
SYMBOL_LOCATION_BATON (sym) = baton;
SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
}
/* Create appropriate locally-scoped variables for all the
DW_TAG_common_block entries. Also create a struct common_block
listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
is used to separate the common blocks name namespace from regular
variable names. */
static void
read_common_block (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_location, cu);
if (attr != nullptr)
{
/* Support the .debug_loc offsets. */
if (attr->form_is_block ())
{
/* Ok. */
}
else if (attr->form_is_section_offset ())
{
dwarf2_complex_location_expr_complaint ();
attr = NULL;
}
else
{
dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
"common block member");
attr = NULL;
}
}
if (die->child != NULL)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct die_info *child_die;
size_t n_entries = 0, size;
struct common_block *common_block;
struct symbol *sym;
for (child_die = die->child;
child_die && child_die->tag;
child_die = child_die->sibling)
++n_entries;
size = (sizeof (struct common_block)
+ (n_entries - 1) * sizeof (struct symbol *));
common_block
= (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
size);
memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
common_block->n_entries = 0;
for (child_die = die->child;
child_die && child_die->tag;
child_die = child_die->sibling)
{
/* Create the symbol in the DW_TAG_common_block block in the current
symbol scope. */
sym = new_symbol (child_die, NULL, cu);
if (sym != NULL)
{
struct attribute *member_loc;
common_block->contents[common_block->n_entries++] = sym;
member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
cu);
if (member_loc)
{
/* GDB has handled this for a long time, but it is
not specified by DWARF. It seems to have been
emitted by gfortran at least as recently as:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
complaint (_("Variable in common block has "
"DW_AT_data_member_location "
"- DIE at %s [in module %s]"),
sect_offset_str (child_die->sect_off),
objfile_name (objfile));
if (member_loc->form_is_section_offset ())
dwarf2_complex_location_expr_complaint ();
else if (member_loc->form_is_constant ()
|| member_loc->form_is_block ())
{
if (attr != nullptr)
mark_common_block_symbol_computed (sym, die, attr,
member_loc, cu);
}
else
dwarf2_complex_location_expr_complaint ();
}
}
}
sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
}
}
/* Create a type for a C++ namespace. */
static struct type *
read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
const char *previous_prefix, *name;
int is_anonymous;
struct type *type;
/* For extensions, reuse the type of the original namespace. */
if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
{
struct die_info *ext_die;
struct dwarf2_cu *ext_cu = cu;
ext_die = dwarf2_extension (die, &ext_cu);
type = read_type_die (ext_die, ext_cu);
/* EXT_CU may not be the same as CU.
Ensure TYPE is recorded with CU in die_type_hash. */
return set_die_type (die, type, cu);
}
name = namespace_name (die, &is_anonymous, cu);
/* Now build the name of the current namespace. */
previous_prefix = determine_prefix (die, cu);
if (previous_prefix[0] != '\0')
name = typename_concat (&objfile->objfile_obstack,
previous_prefix, name, 0, cu);
/* Create the type. */
type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
return set_die_type (die, type, cu);
}
/* Read a namespace scope. */
static void
read_namespace (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
int is_anonymous;
/* Add a symbol associated to this if we haven't seen the namespace
before. Also, add a using directive if it's an anonymous
namespace. */
if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
{
struct type *type;
type = read_type_die (die, cu);
new_symbol (die, type, cu);
namespace_name (die, &is_anonymous, cu);
if (is_anonymous)
{
const char *previous_prefix = determine_prefix (die, cu);
std::vector<const char *> excludes;
add_using_directive (using_directives (cu),
previous_prefix, type->name (), NULL,
NULL, excludes, 0, &objfile->objfile_obstack);
}
}
if (die->child != NULL)
{
struct die_info *child_die = die->child;
while (child_die && child_die->tag)
{
process_die (child_die, cu);
child_die = child_die->sibling;
}
}
}
/* Read a Fortran module as type. This DIE can be only a declaration used for
imported module. Still we need that type as local Fortran "use ... only"
declaration imports depend on the created type in determine_prefix. */
static struct type *
read_module_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
const char *module_name;
struct type *type;
module_name = dwarf2_name (die, cu);
type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
return set_die_type (die, type, cu);
}
/* Read a Fortran module. */
static void
read_module (struct die_info *die, struct dwarf2_cu *cu)
{
struct die_info *child_die = die->child;
struct type *type;
type = read_type_die (die, cu);
new_symbol (die, type, cu);
while (child_die && child_die->tag)
{
process_die (child_die, cu);
child_die = child_die->sibling;
}
}
/* Return the name of the namespace represented by DIE. Set
*IS_ANONYMOUS to tell whether or not the namespace is an anonymous
namespace. */
static const char *
namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
{
struct die_info *current_die;
const char *name = NULL;
/* Loop through the extensions until we find a name. */
for (current_die = die;
current_die != NULL;
current_die = dwarf2_extension (die, &cu))
{
/* We don't use dwarf2_name here so that we can detect the absence
of a name -> anonymous namespace. */
name = dwarf2_string_attr (die, DW_AT_name, cu);
if (name != NULL)
break;
}
/* Is it an anonymous namespace? */
*is_anonymous = (name == NULL);
if (*is_anonymous)
name = CP_ANONYMOUS_NAMESPACE_STR;
return name;
}
/* Extract all information from a DW_TAG_pointer_type DIE and add to
the user defined type vector. */
static struct type *
read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct gdbarch *gdbarch = cu->per_objfile->objfile->arch ();
struct comp_unit_head *cu_header = &cu->header;
struct type *type;
struct attribute *attr_byte_size;
struct attribute *attr_address_class;
int byte_size, addr_class;
struct type *target_type;
target_type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
type = get_die_type (die, cu);
if (type)
return type;
type = lookup_pointer_type (target_type);
attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr_byte_size)
byte_size = attr_byte_size->constant_value (cu_header->addr_size);
else
byte_size = cu_header->addr_size;
attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
if (attr_address_class)
addr_class = attr_address_class->constant_value (DW_ADDR_none);
else
addr_class = DW_ADDR_none;
ULONGEST alignment = get_alignment (cu, die);
/* If the pointer size, alignment, or address class is different
than the default, create a type variant marked as such and set
the length accordingly. */
if (TYPE_LENGTH (type) != byte_size
|| (alignment != 0 && TYPE_RAW_ALIGN (type) != 0
&& alignment != TYPE_RAW_ALIGN (type))
|| addr_class != DW_ADDR_none)
{
if (gdbarch_address_class_type_flags_p (gdbarch))
{
type_instance_flags type_flags
= gdbarch_address_class_type_flags (gdbarch, byte_size,
addr_class);
gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
== 0);
type = make_type_with_address_space (type, type_flags);
}
else if (TYPE_LENGTH (type) != byte_size)
{
complaint (_("invalid pointer size %d"), byte_size);
}
else if (TYPE_RAW_ALIGN (type) != alignment)
{
complaint (_("Invalid DW_AT_alignment"
" - DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
}
else
{
/* Should we also complain about unhandled address classes? */
}
}
TYPE_LENGTH (type) = byte_size;
set_type_align (type, alignment);
return set_die_type (die, type, cu);
}
/* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
the user defined type vector. */
static struct type *
read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *type;
struct type *to_type;
struct type *domain;
to_type = die_type (die, cu);
domain = die_containing_type (die, cu);
/* The calls above may have already set the type for this DIE. */
type = get_die_type (die, cu);
if (type)
return type;
if (check_typedef (to_type)->code () == TYPE_CODE_METHOD)
type = lookup_methodptr_type (to_type);
else if (check_typedef (to_type)->code () == TYPE_CODE_FUNC)
{
struct type *new_type = alloc_type (cu->per_objfile->objfile);
smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
to_type->fields (), to_type->num_fields (),
to_type->has_varargs ());
type = lookup_methodptr_type (new_type);
}
else
type = lookup_memberptr_type (to_type, domain);
return set_die_type (die, type, cu);
}
/* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
the user defined type vector. */
static struct type *
read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
enum type_code refcode)
{
struct comp_unit_head *cu_header = &cu->header;
struct type *type, *target_type;
struct attribute *attr;
gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
target_type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
type = get_die_type (die, cu);
if (type)
return type;
type = lookup_reference_type (target_type, refcode);
attr = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr != nullptr)
{
TYPE_LENGTH (type) = attr->constant_value (cu_header->addr_size);
}
else
{
TYPE_LENGTH (type) = cu_header->addr_size;
}
maybe_set_alignment (cu, die, type);
return set_die_type (die, type, cu);
}
/* Add the given cv-qualifiers to the element type of the array. GCC
outputs DWARF type qualifiers that apply to an array, not the
element type. But GDB relies on the array element type to carry
the cv-qualifiers. This mimics section 6.7.3 of the C99
specification. */
static struct type *
add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
struct type *base_type, int cnst, int voltl)
{
struct type *el_type, *inner_array;
base_type = copy_type (base_type);
inner_array = base_type;
while (TYPE_TARGET_TYPE (inner_array)->code () == TYPE_CODE_ARRAY)
{
TYPE_TARGET_TYPE (inner_array) =
copy_type (TYPE_TARGET_TYPE (inner_array));
inner_array = TYPE_TARGET_TYPE (inner_array);
}
el_type = TYPE_TARGET_TYPE (inner_array);
cnst |= TYPE_CONST (el_type);
voltl |= TYPE_VOLATILE (el_type);
TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
return set_die_type (die, base_type, cu);
}
static struct type *
read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *base_type, *cv_type;
base_type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
cv_type = get_die_type (die, cu);
if (cv_type)
return cv_type;
/* In case the const qualifier is applied to an array type, the element type
is so qualified, not the array type (section 6.7.3 of C99). */
if (base_type->code () == TYPE_CODE_ARRAY)
return add_array_cv_type (die, cu, base_type, 1, 0);
cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
return set_die_type (die, cv_type, cu);
}
static struct type *
read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *base_type, *cv_type;
base_type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
cv_type = get_die_type (die, cu);
if (cv_type)
return cv_type;
/* In case the volatile qualifier is applied to an array type, the
element type is so qualified, not the array type (section 6.7.3
of C99). */
if (base_type->code () == TYPE_CODE_ARRAY)
return add_array_cv_type (die, cu, base_type, 0, 1);
cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
return set_die_type (die, cv_type, cu);
}
/* Handle DW_TAG_restrict_type. */
static struct type *
read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *base_type, *cv_type;
base_type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
cv_type = get_die_type (die, cu);
if (cv_type)
return cv_type;
cv_type = make_restrict_type (base_type);
return set_die_type (die, cv_type, cu);
}
/* Handle DW_TAG_atomic_type. */
static struct type *
read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *base_type, *cv_type;
base_type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
cv_type = get_die_type (die, cu);
if (cv_type)
return cv_type;
cv_type = make_atomic_type (base_type);
return set_die_type (die, cv_type, cu);
}
/* Extract all information from a DW_TAG_string_type DIE and add to
the user defined type vector. It isn't really a user defined type,
but it behaves like one, with other DIE's using an AT_user_def_type
attribute to reference it. */
static struct type *
read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
struct type *type, *range_type, *index_type, *char_type;
struct attribute *attr;
struct dynamic_prop prop;
bool length_is_constant = true;
LONGEST length;
/* There are a couple of places where bit sizes might be made use of
when parsing a DW_TAG_string_type, however, no producer that we know
of make use of these. Handling bit sizes that are a multiple of the
byte size is easy enough, but what about other bit sizes? Lets deal
with that problem when we have to. Warn about these attributes being
unsupported, then parse the type and ignore them like we always
have. */
if (dwarf2_attr (die, DW_AT_bit_size, cu) != nullptr
|| dwarf2_attr (die, DW_AT_string_length_bit_size, cu) != nullptr)
{
static bool warning_printed = false;
if (!warning_printed)
{
warning (_("DW_AT_bit_size and DW_AT_string_length_bit_size not "
"currently supported on DW_TAG_string_type."));
warning_printed = true;
}
}
attr = dwarf2_attr (die, DW_AT_string_length, cu);
if (attr != nullptr && !attr->form_is_constant ())
{
/* The string length describes the location at which the length of
the string can be found. The size of the length field can be
specified with one of the attributes below. */
struct type *prop_type;
struct attribute *len
= dwarf2_attr (die, DW_AT_string_length_byte_size, cu);
if (len == nullptr)
len = dwarf2_attr (die, DW_AT_byte_size, cu);
if (len != nullptr && len->form_is_constant ())
{
/* Pass 0 as the default as we know this attribute is constant
and the default value will not be returned. */
LONGEST sz = len->constant_value (0);
prop_type = cu->per_objfile->int_type (sz, true);
}
else
{
/* If the size is not specified then we assume it is the size of
an address on this target. */
prop_type = cu->addr_sized_int_type (true);
}
/* Convert the attribute into a dynamic property. */
if (!attr_to_dynamic_prop (attr, die, cu, &prop, prop_type))
length = 1;
else
length_is_constant = false;
}
else if (attr != nullptr)
{
/* This DW_AT_string_length just contains the length with no
indirection. There's no need to create a dynamic property in this
case. Pass 0 for the default value as we know it will not be
returned in this case. */
length = attr->constant_value (0);
}
else if ((attr = dwarf2_attr (die, DW_AT_byte_size, cu)) != nullptr)
{
/* We don't currently support non-constant byte sizes for strings. */
length = attr->constant_value (1);
}
else
{
/* Use 1 as a fallback length if we have nothing else. */
length = 1;
}
index_type = objfile_type (objfile)->builtin_int;
if (length_is_constant)
range_type = create_static_range_type (NULL, index_type, 1, length);
else
{
struct dynamic_prop low_bound;
low_bound.set_const_val (1);
range_type = create_range_type (NULL, index_type, &low_bound, &prop, 0);
}
char_type = language_string_char_type (cu->language_defn, gdbarch);
type = create_string_type (NULL, char_type, range_type);
return set_die_type (die, type, cu);
}
/* Assuming that DIE corresponds to a function, returns nonzero
if the function is prototyped. */
static int
prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_prototyped, cu);
if (attr && attr->as_boolean ())
return 1;
/* The DWARF standard implies that the DW_AT_prototyped attribute
is only meaningful for C, but the concept also extends to other
languages that allow unprototyped functions (Eg: Objective C).
For all other languages, assume that functions are always
prototyped. */
if (cu->per_cu->lang != language_c
&& cu->per_cu->lang != language_objc
&& cu->per_cu->lang != language_opencl)
return 1;
/* RealView does not emit DW_AT_prototyped. We can not distinguish
prototyped and unprototyped functions; default to prototyped,
since that is more common in modern code (and RealView warns
about unprototyped functions). */
if (producer_is_realview (cu->producer))
return 1;
return 0;
}
/* Handle DIES due to C code like:
struct foo
{
int (*funcp)(int a, long l);
int b;
};
('funcp' generates a DW_TAG_subroutine_type DIE). */
static struct type *
read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct type *type; /* Type that this function returns. */
struct type *ftype; /* Function that returns above type. */
struct attribute *attr;
type = die_type (die, cu);
/* The die_type call above may have already set the type for this DIE. */
ftype = get_die_type (die, cu);
if (ftype)
return ftype;
ftype = lookup_function_type (type);
if (prototyped_function_p (die, cu))
ftype->set_is_prototyped (true);
/* Store the calling convention in the type if it's available in
the subroutine die. Otherwise set the calling convention to
the default value DW_CC_normal. */
attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
if (attr != nullptr
&& is_valid_DW_AT_calling_convention_for_subroutine (attr->constant_value (0)))
TYPE_CALLING_CONVENTION (ftype)
= (enum dwarf_calling_convention) attr->constant_value (0);
else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
else
TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
/* Record whether the function returns normally to its caller or not
if the DWARF producer set that information. */
attr = dwarf2_attr (die, DW_AT_noreturn, cu);
if (attr && attr->as_boolean ())
TYPE_NO_RETURN (ftype) = 1;
/* We need to add the subroutine type to the die immediately so
we don't infinitely recurse when dealing with parameters
declared as the same subroutine type. */
set_die_type (die, ftype, cu);
if (die->child != NULL)
{
struct type *void_type = objfile_type (objfile)->builtin_void;
struct die_info *child_die;
int nparams, iparams;
/* Count the number of parameters.
FIXME: GDB currently ignores vararg functions, but knows about
vararg member functions. */
nparams = 0;
child_die = die->child;
while (child_die && child_die->tag)
{
if (child_die->tag == DW_TAG_formal_parameter)
nparams++;
else if (child_die->tag == DW_TAG_unspecified_parameters)
ftype->set_has_varargs (true);
child_die = child_die->sibling;
}
/* Allocate storage for parameters and fill them in. */
ftype->set_num_fields (nparams);
ftype->set_fields
((struct field *) TYPE_ZALLOC (ftype, nparams * sizeof (struct field)));
/* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
even if we error out during the parameters reading below. */
for (iparams = 0; iparams < nparams; iparams++)
ftype->field (iparams).set_type (void_type);
iparams = 0;
child_die = die->child;
while (child_die && child_die->tag)
{
if (child_die->tag == DW_TAG_formal_parameter)
{
struct type *arg_type;
/* DWARF version 2 has no clean way to discern C++
static and non-static member functions. G++ helps
GDB by marking the first parameter for non-static
member functions (which is the this pointer) as
artificial. We pass this information to
dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
DWARF version 3 added DW_AT_object_pointer, which GCC
4.5 does not yet generate. */
attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
if (attr != nullptr)
TYPE_FIELD_ARTIFICIAL (ftype, iparams) = attr->as_boolean ();
else
TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
arg_type = die_type (child_die, cu);
/* RealView does not mark THIS as const, which the testsuite
expects. GCC marks THIS as const in method definitions,
but not in the class specifications (GCC PR 43053). */
if (cu->per_cu->lang == language_cplus
&& !TYPE_CONST (arg_type)
&& TYPE_FIELD_ARTIFICIAL (ftype, iparams))
{
int is_this = 0;
struct dwarf2_cu *arg_cu = cu;
const char *name = dwarf2_name (child_die, cu);
attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
if (attr != nullptr)
{
/* If the compiler emits this, use it. */
if (follow_die_ref (die, attr, &arg_cu) == child_die)
is_this = 1;
}
else if (name && strcmp (name, "this") == 0)
/* Function definitions will have the argument names. */
is_this = 1;
else if (name == NULL && iparams == 0)
/* Declarations may not have the names, so like
elsewhere in GDB, assume an artificial first
argument is "this". */
is_this = 1;
if (is_this)
arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
arg_type, 0);
}
ftype->field (iparams).set_type (arg_type);
iparams++;
}
child_die = child_die->sibling;
}
}
return ftype;
}
static struct type *
read_typedef (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
const char *name = NULL;
struct type *this_type, *target_type;
name = dwarf2_full_name (NULL, die, cu);
this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
this_type->set_target_is_stub (true);
set_die_type (die, this_type, cu);
target_type = die_type (die, cu);
if (target_type != this_type)
TYPE_TARGET_TYPE (this_type) = target_type;
else
{
/* Self-referential typedefs are, it seems, not allowed by the DWARF
spec and cause infinite loops in GDB. */
complaint (_("Self-referential DW_TAG_typedef "
"- DIE at %s [in module %s]"),
sect_offset_str (die->sect_off), objfile_name (objfile));
TYPE_TARGET_TYPE (this_type) = NULL;
}
if (name == NULL)
{
/* Gcc-7 and before supports -feliminate-dwarf2-dups, which generates
anonymous typedefs, which is, strictly speaking, invalid DWARF.
Handle these by just returning the target type, rather than
constructing an anonymous typedef type and trying to handle this
elsewhere. */
set_die_type (die, target_type, cu);
return target_type;
}
return this_type;
}
/* Helper for get_dwarf2_rational_constant that computes the value of
a given gmp_mpz given an attribute. */
static void
get_mpz (struct dwarf2_cu *cu, gdb_mpz *value, struct attribute *attr)
{
/* GCC will sometimes emit a 16-byte constant value as a DWARF
location expression that pushes an implicit value. */
if (attr->form == DW_FORM_exprloc)
{
dwarf_block *blk = attr->as_block ();
if (blk->size > 0 && blk->data[0] == DW_OP_implicit_value)
{
uint64_t len;
const gdb_byte *ptr = safe_read_uleb128 (blk->data + 1,
blk->data + blk->size,
&len);
if (ptr - blk->data + len <= blk->size)
{
mpz_import (value->val, len,
bfd_big_endian (cu->per_objfile->objfile->obfd) ? 1 : -1,
1, 0, 0, ptr);
return;
}
}
/* On failure set it to 1. */
*value = gdb_mpz (1);
}
else if (attr->form_is_block ())
{
dwarf_block *blk = attr->as_block ();
mpz_import (value->val, blk->size,
bfd_big_endian (cu->per_objfile->objfile->obfd) ? 1 : -1,
1, 0, 0, blk->data);
}
else
*value = gdb_mpz (attr->constant_value (1));
}
/* Assuming DIE is a rational DW_TAG_constant, read the DIE's
numerator and denominator into NUMERATOR and DENOMINATOR (resp).
If the numerator and/or numerator attribute is missing,
a complaint is filed, and NUMERATOR and DENOMINATOR are left
untouched. */
static void
get_dwarf2_rational_constant (struct die_info *die, struct dwarf2_cu *cu,
gdb_mpz *numerator, gdb_mpz *denominator)
{
struct attribute *num_attr, *denom_attr;
num_attr = dwarf2_attr (die, DW_AT_GNU_numerator, cu);
if (num_attr == nullptr)
complaint (_("DW_AT_GNU_numerator missing in %s DIE at %s"),
dwarf_tag_name (die->tag), sect_offset_str (die->sect_off));
denom_attr = dwarf2_attr (die, DW_AT_GNU_denominator, cu);
if (denom_attr == nullptr)
complaint (_("DW_AT_GNU_denominator missing in %s DIE at %s"),
dwarf_tag_name (die->tag), sect_offset_str (die->sect_off));
if (num_attr == nullptr || denom_attr == nullptr)
return;
get_mpz (cu, numerator, num_attr);
get_mpz (cu, denominator, denom_attr);
}
/* Same as get_dwarf2_rational_constant, but extracting an unsigned
rational constant, rather than a signed one.
If the rational constant has a negative value, a complaint
is filed, and NUMERATOR and DENOMINATOR are left untouched. */
static void
get_dwarf2_unsigned_rational_constant (struct die_info *die,
struct dwarf2_cu *cu,
gdb_mpz *numerator,
gdb_mpz *denominator)
{
gdb_mpz num (1);
gdb_mpz denom (1);
get_dwarf2_rational_constant (die, cu, &num, &denom);
if (mpz_sgn (num.val) == -1 && mpz_sgn (denom.val) == -1)
{
mpz_neg (num.val, num.val);
mpz_neg (denom.val, denom.val);
}
else if (mpz_sgn (num.val) == -1)
{
complaint (_("unexpected negative value for DW_AT_GNU_numerator"
" in DIE at %s"),
sect_offset_str (die->sect_off));
return;
}
else if (mpz_sgn (denom.val) == -1)
{
complaint (_("unexpected negative value for DW_AT_GNU_denominator"
" in DIE at %s"),
sect_offset_str (die->sect_off));
return;
}
*numerator = std::move (num);
*denominator = std::move (denom);
}
/* Assuming that ENCODING is a string whose contents starting at the
K'th character is "_nn" where "nn" is a decimal number, scan that
number and set RESULT to the value. K is updated to point to the
character immediately following the number.
If the string does not conform to the format described above, false
is returned, and K may or may not be changed. */
static bool
ada_get_gnat_encoded_number (const char *encoding, int &k, gdb_mpz *result)
{
/* The next character should be an underscore ('_') followed
by a digit. */
if (encoding[k] != '_' || !isdigit (encoding[k + 1]))
return false;
/* Skip the underscore. */
k++;
int start = k;
/* Determine the number of digits for our number. */
while (isdigit (encoding[k]))
k++;
if (k == start)
return false;
std::string copy (&encoding[start], k - start);
if (mpz_set_str (result->val, copy.c_str (), 10) == -1)
return false;
return true;
}
/* Scan two numbers from ENCODING at OFFSET, assuming the string is of
the form _NN_DD, where NN and DD are decimal numbers. Set NUM and
DENOM, update OFFSET, and return true on success. Return false on
failure. */
static bool
ada_get_gnat_encoded_ratio (const char *encoding, int &offset,
gdb_mpz *num, gdb_mpz *denom)
{
if (!ada_get_gnat_encoded_number (encoding, offset, num))
return false;
return ada_get_gnat_encoded_number (encoding, offset, denom);
}
/* Assuming DIE corresponds to a fixed point type, finish the creation
of the corresponding TYPE by setting its type-specific data. CU is
the DIE's CU. SUFFIX is the "XF" type name suffix coming from GNAT
encodings. It is nullptr if the GNAT encoding should be
ignored. */
static void
finish_fixed_point_type (struct type *type, const char *suffix,
struct die_info *die, struct dwarf2_cu *cu)
{
gdb_assert (type->code () == TYPE_CODE_FIXED_POINT
&& TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_FIXED_POINT);
/* If GNAT encodings are preferred, don't examine the
attributes. */
struct attribute *attr = nullptr;
if (suffix == nullptr)
{
attr = dwarf2_attr (die, DW_AT_binary_scale, cu);
if (attr == nullptr)
attr = dwarf2_attr (die, DW_AT_decimal_scale, cu);
if (attr == nullptr)
attr = dwarf2_attr (die, DW_AT_small, cu);
}
/* Numerator and denominator of our fixed-point type's scaling factor.
The default is a scaling factor of 1, which we use as a fallback
when we are not able to decode it (problem with the debugging info,
unsupported forms, bug in GDB, etc...). Using that as the default
allows us to at least print the unscaled value, which might still
be useful to a user. */
gdb_mpz scale_num (1);
gdb_mpz scale_denom (1);
if (attr == nullptr)
{
int offset = 0;
if (suffix != nullptr
&& ada_get_gnat_encoded_ratio (suffix, offset, &scale_num,
&scale_denom)
/* The number might be encoded as _nn_dd_nn_dd, where the
second ratio is the 'small value. In this situation, we
want the second value. */
&& (suffix[offset] != '_'
|| ada_get_gnat_encoded_ratio (suffix, offset, &scale_num,
&scale_denom)))
{
/* Found it. */
}
else
{
/* Scaling factor not found. Assume a scaling factor of 1,
and hope for the best. At least the user will be able to
see the encoded value. */
scale_num = 1;
scale_denom = 1;
complaint (_("no scale found for fixed-point type (DIE at %s)"),
sect_offset_str (die->sect_off));
}
}
else if (attr->name == DW_AT_binary_scale)
{
LONGEST scale_exp = attr->constant_value (0);
gdb_mpz *num_or_denom = scale_exp > 0 ? &scale_num : &scale_denom;
mpz_mul_2exp (num_or_denom->val, num_or_denom->val, std::abs (scale_exp));
}
else if (attr->name == DW_AT_decimal_scale)
{
LONGEST scale_exp = attr->constant_value (0);
gdb_mpz *num_or_denom = scale_exp > 0 ? &scale_num : &scale_denom;
mpz_ui_pow_ui (num_or_denom->val, 10, std::abs (scale_exp));
}
else if (attr->name == DW_AT_small)
{
struct die_info *scale_die;
struct dwarf2_cu *scale_cu = cu;
scale_die = follow_die_ref (die, attr, &scale_cu);
if (scale_die->tag == DW_TAG_constant)
get_dwarf2_unsigned_rational_constant (scale_die, scale_cu,
&scale_num, &scale_denom);
else
complaint (_("%s DIE not supported as target of DW_AT_small attribute"
" (DIE at %s)"),
dwarf_tag_name (die->tag), sect_offset_str (die->sect_off));
}
else
{
complaint (_("unsupported scale attribute %s for fixed-point type"
" (DIE at %s)"),
dwarf_attr_name (attr->name),
sect_offset_str (die->sect_off));
}
gdb_mpq &scaling_factor = type->fixed_point_info ().scaling_factor;
mpz_set (mpq_numref (scaling_factor.val), scale_num.val);
mpz_set (mpq_denref (scaling_factor.val), scale_denom.val);
mpq_canonicalize (scaling_factor.val);
}
/* The gnat-encoding suffix for fixed point. */
#define GNAT_FIXED_POINT_SUFFIX "___XF_"
/* If NAME encodes an Ada fixed-point type, return a pointer to the
"XF" suffix of the name. The text after this is what encodes the
'small and 'delta information. Otherwise, return nullptr. */
static const char *
gnat_encoded_fixed_point_type_info (const char *name)
{
return strstr (name, GNAT_FIXED_POINT_SUFFIX);
}
/* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
(which may be different from NAME) to the architecture back-end to allow
it to guess the correct format if necessary. */
static struct type *
dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
const char *name_hint, enum bfd_endian byte_order)
{
struct gdbarch *gdbarch = objfile->arch ();
const struct floatformat **format;
struct type *type;
format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
if (format)
type = init_float_type (objfile, bits, name, format, byte_order);
else
type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
return type;
}
/* Allocate an integer type of size BITS and name NAME. */
static struct type *
dwarf2_init_integer_type (struct dwarf2_cu *cu, struct objfile *objfile,
int bits, int unsigned_p, const char *name)
{
struct type *type;
/* Versions of Intel's C Compiler generate an integer type called "void"
instead of using DW_TAG_unspecified_type. This has been seen on
at least versions 14, 17, and 18. */
if (bits == 0 && producer_is_icc (cu) && name != nullptr
&& strcmp (name, "void") == 0)
type = objfile_type (objfile)->builtin_void;
else
type = init_integer_type (objfile, bits, unsigned_p, name);
return type;
}
/* Return true if DIE has a DW_AT_small attribute whose value is
a constant rational, where both the numerator and denominator
are equal to zero.
CU is the DIE's Compilation Unit. */
static bool
has_zero_over_zero_small_attribute (struct die_info *die,
struct dwarf2_cu *cu)
{
struct attribute *attr = dwarf2_attr (die, DW_AT_small, cu);
if (attr == nullptr)
return false;
struct dwarf2_cu *scale_cu = cu;
struct die_info *scale_die
= follow_die_ref (die, attr, &scale_cu);
if (scale_die->tag != DW_TAG_constant)
return false;
gdb_mpz num (1), denom (1);
get_dwarf2_rational_constant (scale_die, cu, &num, &denom);
return mpz_sgn (num.val) == 0 && mpz_sgn (denom.val) == 0;
}
/* Initialise and return a floating point type of size BITS suitable for
use as a component of a complex number. The NAME_HINT is passed through
when initialising the floating point type and is the name of the complex
type.
As DWARF doesn't currently provide an explicit name for the components
of a complex number, but it can be helpful to have these components
named, we try to select a suitable name based on the size of the
component. */
static struct type *
dwarf2_init_complex_target_type (struct dwarf2_cu *cu,
struct objfile *objfile,
int bits, const char *name_hint,
enum bfd_endian byte_order)
{
gdbarch *gdbarch = objfile->arch ();
struct type *tt = nullptr;
/* Try to find a suitable floating point builtin type of size BITS.
We're going to use the name of this type as the name for the complex
target type that we are about to create. */
switch (cu->per_cu->lang)
{
case language_fortran:
switch (bits)
{
case 32:
tt = builtin_f_type (gdbarch)->builtin_real;
break;
case 64:
tt = builtin_f_type (gdbarch)->builtin_real_s8;
break;
case 96: /* The x86-32 ABI specifies 96-bit long double. */
case 128:
tt = builtin_f_type (gdbarch)->builtin_real_s16;
break;
}
break;
default:
switch (bits)
{
case 32:
tt = builtin_type (gdbarch)->builtin_float;
break;
case 64:
tt = builtin_type (gdbarch)->builtin_double;
break;
case 96: /* The x86-32 ABI specifies 96-bit long double. */
case 128:
tt = builtin_type (gdbarch)->builtin_long_double;
break;
}
break;
}
/* If the type we found doesn't match the size we were looking for, then
pretend we didn't find a type at all, the complex target type we
create will then be nameless. */
if (tt != nullptr && TYPE_LENGTH (tt) * TARGET_CHAR_BIT != bits)
tt = nullptr;
const char *name = (tt == nullptr) ? nullptr : tt->name ();
return dwarf2_init_float_type (objfile, bits, name, name_hint, byte_order);
}
/* Find a representation of a given base type and install
it in the TYPE field of the die. */
static struct type *
read_base_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct type *type;
struct attribute *attr;
int encoding = 0, bits = 0;
const char *name;
gdbarch *arch;
attr = dwarf2_attr (die, DW_AT_encoding, cu);
if (attr != nullptr && attr->form_is_constant ())
encoding = attr->constant_value (0);
attr = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr != nullptr)
bits = attr->constant_value (0) * TARGET_CHAR_BIT;
name = dwarf2_name (die, cu);
if (!name)
complaint (_("DW_AT_name missing from DW_TAG_base_type"));
arch = objfile->arch ();
enum bfd_endian byte_order = gdbarch_byte_order (arch);
attr = dwarf2_attr (die, DW_AT_endianity, cu);
if (attr != nullptr && attr->form_is_constant ())
{
int endianity = attr->constant_value (0);
switch (endianity)
{
case DW_END_big:
byte_order = BFD_ENDIAN_BIG;
break;
case DW_END_little:
byte_order = BFD_ENDIAN_LITTLE;
break;
default:
complaint (_("DW_AT_endianity has unrecognized value %d"), endianity);
break;
}
}
if ((encoding == DW_ATE_signed_fixed || encoding == DW_ATE_unsigned_fixed)
&& cu->per_cu->lang == language_ada
&& has_zero_over_zero_small_attribute (die, cu))
{
/* brobecker/2018-02-24: This is a fixed point type for which
the scaling factor is represented as fraction whose value
does not make sense (zero divided by zero), so we should
normally never see these. However, there is a small category
of fixed point types for which GNAT is unable to provide
the scaling factor via the standard DWARF mechanisms, and
for which the info is provided via the GNAT encodings instead.
This is likely what this DIE is about. */
encoding = (encoding == DW_ATE_signed_fixed
? DW_ATE_signed
: DW_ATE_unsigned);
}
/* With GNAT encodings, fixed-point information will be encoded in
the type name. Note that this can also occur with the above
zero-over-zero case, which is why this is a separate "if" rather
than an "else if". */
const char *gnat_encoding_suffix = nullptr;
if ((encoding == DW_ATE_signed || encoding == DW_ATE_unsigned)
&& cu->per_cu->lang == language_ada
&& name != nullptr)
{
gnat_encoding_suffix = gnat_encoded_fixed_point_type_info (name);
if (gnat_encoding_suffix != nullptr)
{
gdb_assert (startswith (gnat_encoding_suffix,
GNAT_FIXED_POINT_SUFFIX));
name = obstack_strndup (&cu->per_objfile->objfile->objfile_obstack,
name, gnat_encoding_suffix - name);
/* Use -1 here so that SUFFIX points at the "_" after the
"XF". */
gnat_encoding_suffix += strlen (GNAT_FIXED_POINT_SUFFIX) - 1;
encoding = (encoding == DW_ATE_signed
? DW_ATE_signed_fixed
: DW_ATE_unsigned_fixed);
}
}
switch (encoding)
{
case DW_ATE_address:
/* Turn DW_ATE_address into a void * pointer. */
type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
type = init_pointer_type (objfile, bits, name, type);
break;
case DW_ATE_boolean:
type = init_boolean_type (objfile, bits, 1, name);
break;
case DW_ATE_complex_float:
type = dwarf2_init_complex_target_type (cu, objfile, bits / 2, name,
byte_order);
if (type->code () == TYPE_CODE_ERROR)
{
if (name == nullptr)
{
struct obstack *obstack
= &cu->per_objfile->objfile->objfile_obstack;
name = obconcat (obstack, "_Complex ", type->name (),
nullptr);
}
type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
}
else
type = init_complex_type (name, type);
break;
case DW_ATE_decimal_float:
type = init_decfloat_type (objfile, bits, name);
break;
case DW_ATE_float:
type = dwarf2_init_float_type (objfile, bits, name, name, byte_order);
break;
case DW_ATE_signed:
type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
break;
case DW_ATE_unsigned:
if (cu->per_cu->lang == language_fortran
&& name
&& startswith (name, "character("))
type = init_character_type (objfile, bits, 1, name);
else
type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
break;
case DW_ATE_signed_char:
if (cu->per_cu->lang == language_ada
|| cu->per_cu->lang == language_m2
|| cu->per_cu->lang == language_pascal
|| cu->per_cu->lang == language_fortran)
type = init_character_type (objfile, bits, 0, name);
else
type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
break;
case DW_ATE_unsigned_char:
if (cu->per_cu->lang == language_ada
|| cu->per_cu->lang == language_m2
|| cu->per_cu->lang == language_pascal
|| cu->per_cu->lang == language_fortran
|| cu->per_cu->lang == language_rust)
type = init_character_type (objfile, bits, 1, name);
else
type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
break;
case DW_ATE_UTF:
{
if (bits == 16)
type = builtin_type (arch)->builtin_char16;
else if (bits == 32)
type = builtin_type (arch)->builtin_char32;
else
{
complaint (_("unsupported DW_ATE_UTF bit size: '%d'"),
bits);
type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
}
return set_die_type (die, type, cu);
}
break;
case DW_ATE_signed_fixed:
type = init_fixed_point_type (objfile, bits, 0, name);
finish_fixed_point_type (type, gnat_encoding_suffix, die, cu);
break;
case DW_ATE_unsigned_fixed:
type = init_fixed_point_type (objfile, bits, 1, name);
finish_fixed_point_type (type, gnat_encoding_suffix, die, cu);
break;
default:
complaint (_("unsupported DW_AT_encoding: '%s'"),
dwarf_type_encoding_name (encoding));
type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
break;
}
if (name && strcmp (name, "char") == 0)
type->set_has_no_signedness (true);
maybe_set_alignment (cu, die, type);
type->set_endianity_is_not_default (gdbarch_byte_order (arch) != byte_order);
if (TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_INT)
{
attr = dwarf2_attr (die, DW_AT_bit_size, cu);
if (attr != nullptr && attr->as_unsigned () <= 8 * TYPE_LENGTH (type))
{
unsigned real_bit_size = attr->as_unsigned ();
attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
/* Only use the attributes if they make sense together. */
if (attr == nullptr
|| (attr->as_unsigned () + real_bit_size
<= 8 * TYPE_LENGTH (type)))
{
TYPE_MAIN_TYPE (type)->type_specific.int_stuff.bit_size
= real_bit_size;
if (attr != nullptr)
TYPE_MAIN_TYPE (type)->type_specific.int_stuff.bit_offset
= attr->as_unsigned ();
}
}
}
return set_die_type (die, type, cu);
}
/* A helper function that returns the name of DIE, if it refers to a
variable declaration. */
static const char *
var_decl_name (struct die_info *die, struct dwarf2_cu *cu)
{
if (die->tag != DW_TAG_variable)
return nullptr;
attribute *attr = dwarf2_attr (die, DW_AT_declaration, cu);
if (attr == nullptr || !attr->as_boolean ())
return nullptr;
attr = dwarf2_attr (die, DW_AT_name, cu);
if (attr == nullptr)
return nullptr;
return attr->as_string ();
}
/* Parse dwarf attribute if it's a block, reference or constant and put the
resulting value of the attribute into struct bound_prop.
Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
static int
attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
struct dwarf2_cu *cu, struct dynamic_prop *prop,
struct type *default_type)
{
struct dwarf2_property_baton *baton;
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct obstack *obstack = &objfile->objfile_obstack;
gdb_assert (default_type != NULL);
if (attr == NULL || prop == NULL)
return 0;
if (attr->form_is_block ())
{
baton = XOBNEW (obstack, struct dwarf2_property_baton);
baton->property_type = default_type;
baton->locexpr.per_cu = cu->per_cu;
baton->locexpr.per_objfile = per_objfile;
struct dwarf_block *block;
if (attr->form == DW_FORM_data16)
{
size_t data_size = 16;
block = XOBNEW (obstack, struct dwarf_block);
block->size = (data_size
+ 2 /* Extra bytes for DW_OP and arg. */);
gdb_byte *data = XOBNEWVEC (obstack, gdb_byte, block->size);
data[0] = DW_OP_implicit_value;
data[1] = data_size;
memcpy (&data[2], attr->as_block ()->data, data_size);
block->data = data;
}
else
block = attr->as_block ();
baton->locexpr.size = block->size;
baton->locexpr.data = block->data;
switch (attr->name)
{
case DW_AT_string_length:
baton->locexpr.is_reference = true;
break;
default:
baton->locexpr.is_reference = false;
break;
}
prop->set_locexpr (baton);
gdb_assert (prop->baton () != NULL);
}
else if (attr->form_is_ref ())
{
struct dwarf2_cu *target_cu = cu;
struct die_info *target_die;
struct attribute *target_attr;
target_die = follow_die_ref (die, attr, &target_cu);
target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
if (target_attr == NULL)
target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
target_cu);
if (target_attr == NULL)
{
const char *name = var_decl_name (target_die, target_cu);
if (name != nullptr)
{
prop->set_variable_name (name);
return 1;
}
return 0;
}
switch (target_attr->name)
{
case DW_AT_location:
if (target_attr->form_is_section_offset ())
{
baton = XOBNEW (obstack, struct dwarf2_property_baton);
baton->property_type = die_type (target_die, target_cu);
fill_in_loclist_baton (cu, &baton->loclist, target_attr);
prop->set_loclist (baton);
gdb_assert (prop->baton () != NULL);
}
else if (target_attr->form_is_block ())
{
baton = XOBNEW (obstack, struct dwarf2_property_baton);
baton->property_type = die_type (target_die, target_cu);
baton->locexpr.per_cu = cu->per_cu;
baton->locexpr.per_objfile = per_objfile;
struct dwarf_block *block = target_attr->as_block ();
baton->locexpr.size = block->size;
baton->locexpr.data = block->data;
baton->locexpr.is_reference = true;
prop->set_locexpr (baton);
gdb_assert (prop->baton () != NULL);
}
else
{
dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
"dynamic property");
return 0;
}
break;
case DW_AT_data_member_location:
{
LONGEST offset;
if (!handle_data_member_location (target_die, target_cu,
&offset))
return 0;
baton = XOBNEW (obstack, struct dwarf2_property_baton);
baton->property_type = read_type_die (target_die->parent,
target_cu);
baton->offset_info.offset = offset;
baton->offset_info.type = die_type (target_die, target_cu);
prop->set_addr_offset (baton);
break;
}
}
}
else if (attr->form_is_constant ())
prop->set_const_val (attr->constant_value (0));
else
{
dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
dwarf2_name (die, cu));
return 0;
}
return 1;
}
/* See read.h. */
struct type *
dwarf2_per_objfile::int_type (int size_in_bytes, bool unsigned_p) const
{
struct type *int_type;
/* Helper macro to examine the various builtin types. */
#define TRY_TYPE(F) \
int_type = (unsigned_p \
? objfile_type (objfile)->builtin_unsigned_ ## F \
: objfile_type (objfile)->builtin_ ## F); \
if (int_type != NULL && TYPE_LENGTH (int_type) == size_in_bytes) \
return int_type
TRY_TYPE (char);
TRY_TYPE (short);
TRY_TYPE (int);
TRY_TYPE (long);
TRY_TYPE (long_long);
#undef TRY_TYPE
gdb_assert_not_reached ("unable to find suitable integer type");
}
/* Read the DW_AT_type attribute for a sub-range. If this attribute is not
present (which is valid) then compute the default type based on the
compilation units address size. */
static struct type *
read_subrange_index_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *index_type = die_type (die, cu);
/* Dwarf-2 specifications explicitly allows to create subrange types
without specifying a base type.
In that case, the base type must be set to the type of
the lower bound, upper bound or count, in that order, if any of these
three attributes references an object that has a type.
If no base type is found, the Dwarf-2 specifications say that
a signed integer type of size equal to the size of an address should
be used.
For the following C code: `extern char gdb_int [];'
GCC produces an empty range DIE.
FIXME: muller/2010-05-28: Possible references to object for low bound,
high bound or count are not yet handled by this code. */
if (index_type->code () == TYPE_CODE_VOID)
index_type = cu->addr_sized_int_type (false);
return index_type;
}
/* Read the given DW_AT_subrange DIE. */
static struct type *
read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *base_type, *orig_base_type;
struct type *range_type;
struct attribute *attr;
struct dynamic_prop low, high;
int low_default_is_valid;
int high_bound_is_count = 0;
const char *name;
ULONGEST negative_mask;
orig_base_type = read_subrange_index_type (die, cu);
/* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
whereas the real type might be. So, we use ORIG_BASE_TYPE when
creating the range type, but we use the result of check_typedef
when examining properties of the type. */
base_type = check_typedef (orig_base_type);
/* The die_type call above may have already set the type for this DIE. */
range_type = get_die_type (die, cu);
if (range_type)
return range_type;
high.set_const_val (0);
/* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
omitting DW_AT_lower_bound. */
switch (cu->per_cu->lang)
{
case language_c:
case language_cplus:
low.set_const_val (0);
low_default_is_valid = 1;
break;
case language_fortran:
low.set_const_val (1);
low_default_is_valid = 1;
break;
case language_d:
case language_objc:
case language_rust:
low.set_const_val (0);
low_default_is_valid = (cu->header.version >= 4);
break;
case language_ada:
case language_m2:
case language_pascal:
low.set_const_val (1);
low_default_is_valid = (cu->header.version >= 4);
break;
default:
low.set_const_val (0);
low_default_is_valid = 0;
break;
}
attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
if (attr != nullptr)
attr_to_dynamic_prop (attr, die, cu, &low, base_type);
else if (!low_default_is_valid)
complaint (_("Missing DW_AT_lower_bound "
"- DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
struct attribute *attr_ub, *attr_count;
attr = attr_ub = dwarf2_attr (die, DW_AT_upper_bound, cu);
if (!attr_to_dynamic_prop (attr, die, cu, &high, base_type))
{
attr = attr_count = dwarf2_attr (die, DW_AT_count, cu);
if (attr_to_dynamic_prop (attr, die, cu, &high, base_type))
{
/* If bounds are constant do the final calculation here. */
if (low.kind () == PROP_CONST && high.kind () == PROP_CONST)
high.set_const_val (low.const_val () + high.const_val () - 1);
else
high_bound_is_count = 1;
}
else
{
if (attr_ub != NULL)
complaint (_("Unresolved DW_AT_upper_bound "
"- DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
if (attr_count != NULL)
complaint (_("Unresolved DW_AT_count "
"- DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
}
}
LONGEST bias = 0;
struct attribute *bias_attr = dwarf2_attr (die, DW_AT_GNU_bias, cu);
if (bias_attr != nullptr && bias_attr->form_is_constant ())
bias = bias_attr->constant_value (0);
/* Normally, the DWARF producers are expected to use a signed
constant form (Eg. DW_FORM_sdata) to express negative bounds.
But this is unfortunately not always the case, as witnessed
with GCC, for instance, where the ambiguous DW_FORM_dataN form
is used instead. To work around that ambiguity, we treat
the bounds as signed, and thus sign-extend their values, when
the base type is signed. */
negative_mask =
-((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
if (low.kind () == PROP_CONST
&& !base_type->is_unsigned () && (low.const_val () & negative_mask))
low.set_const_val (low.const_val () | negative_mask);
if (high.kind () == PROP_CONST
&& !base_type->is_unsigned () && (high.const_val () & negative_mask))
high.set_const_val (high.const_val () | negative_mask);
/* Check for bit and byte strides. */
struct dynamic_prop byte_stride_prop;
attribute *attr_byte_stride = dwarf2_attr (die, DW_AT_byte_stride, cu);
if (attr_byte_stride != nullptr)
{
struct type *prop_type = cu->addr_sized_int_type (false);
attr_to_dynamic_prop (attr_byte_stride, die, cu, &byte_stride_prop,
prop_type);
}
struct dynamic_prop bit_stride_prop;
attribute *attr_bit_stride = dwarf2_attr (die, DW_AT_bit_stride, cu);
if (attr_bit_stride != nullptr)
{
/* It only makes sense to have either a bit or byte stride. */
if (attr_byte_stride != nullptr)
{
complaint (_("Found DW_AT_bit_stride and DW_AT_byte_stride "
"- DIE at %s [in module %s]"),
sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
attr_bit_stride = nullptr;
}
else
{
struct type *prop_type = cu->addr_sized_int_type (false);
attr_to_dynamic_prop (attr_bit_stride, die, cu, &bit_stride_prop,
prop_type);
}
}
if (attr_byte_stride != nullptr
|| attr_bit_stride != nullptr)
{
bool byte_stride_p = (attr_byte_stride != nullptr);
struct dynamic_prop *stride
= byte_stride_p ? &byte_stride_prop : &bit_stride_prop;
range_type
= create_range_type_with_stride (NULL, orig_base_type, &low,
&high, bias, stride, byte_stride_p);
}
else
range_type = create_range_type (NULL, orig_base_type, &low, &high, bias);
if (high_bound_is_count)
range_type->bounds ()->flag_upper_bound_is_count = 1;
/* Ada expects an empty array on no boundary attributes. */
if (attr == NULL && cu->per_cu->lang != language_ada)
range_type->bounds ()->high.set_undefined ();
name = dwarf2_name (die, cu);
if (name)
range_type->set_name (name);
attr = dwarf2_attr (die, DW_AT_byte_size, cu);
if (attr != nullptr)
TYPE_LENGTH (range_type) = attr->constant_value (0);
maybe_set_alignment (cu, die, range_type);
set_die_type (die, range_type, cu);
/* set_die_type should be already done. */
set_descriptive_type (range_type, die, cu);
return range_type;
}
static struct type *
read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *type;
type = init_type (cu->per_objfile->objfile, TYPE_CODE_VOID, 0, NULL);
type->set_name (dwarf2_name (die, cu));
/* In Ada, an unspecified type is typically used when the description
of the type is deferred to a different unit. When encountering
such a type, we treat it as a stub, and try to resolve it later on,
when needed. */
if (cu->per_cu->lang == language_ada)
type->set_is_stub (true);
return set_die_type (die, type, cu);
}
/* Read a single die and all its descendents. Set the die's sibling
field to NULL; set other fields in the die correctly, and set all
of the descendents' fields correctly. Set *NEW_INFO_PTR to the
location of the info_ptr after reading all of those dies. PARENT
is the parent of the die in question. */
static struct die_info *
read_die_and_children (const struct die_reader_specs *reader,
const gdb_byte *info_ptr,
const gdb_byte **new_info_ptr,
struct die_info *parent)
{
struct die_info *die;
const gdb_byte *cur_ptr;
cur_ptr = read_full_die_1 (reader, &die, info_ptr, 0);
if (die == NULL)
{
*new_info_ptr = cur_ptr;
return NULL;
}
store_in_ref_table (die, reader->cu);
if (die->has_children)
die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
else
{
die->child = NULL;
*new_info_ptr = cur_ptr;
}
die->sibling = NULL;
die->parent = parent;
return die;
}
/* Read a die, all of its descendents, and all of its siblings; set
all of the fields of all of the dies correctly. Arguments are as
in read_die_and_children. */
static struct die_info *
read_die_and_siblings_1 (const struct die_reader_specs *reader,
const gdb_byte *info_ptr,
const gdb_byte **new_info_ptr,
struct die_info *parent)
{
struct die_info *first_die, *last_sibling;
const gdb_byte *cur_ptr;
cur_ptr = info_ptr;
first_die = last_sibling = NULL;
while (1)
{
struct die_info *die
= read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
if (die == NULL)
{
*new_info_ptr = cur_ptr;
return first_die;
}
if (!first_die)
first_die = die;
else
last_sibling->sibling = die;
last_sibling = die;
}
}
/* Read a die, all of its descendents, and all of its siblings; set
all of the fields of all of the dies correctly. Arguments are as
in read_die_and_children.
This the main entry point for reading a DIE and all its children. */
static struct die_info *
read_die_and_siblings (const struct die_reader_specs *reader,
const gdb_byte *info_ptr,
const gdb_byte **new_info_ptr,
struct die_info *parent)
{
struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
new_info_ptr, parent);
if (dwarf_die_debug)
{
fprintf_unfiltered (gdb_stdlog,
"Read die from %s@0x%x of %s:\n",
reader->die_section->get_name (),
(unsigned) (info_ptr - reader->die_section->buffer),
bfd_get_filename (reader->abfd));
dump_die (die, dwarf_die_debug);
}
return die;
}
/* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
attributes.
The caller is responsible for filling in the extra attributes
and updating (*DIEP)->num_attrs.
Set DIEP to point to a newly allocated die with its information,
except for its child, sibling, and parent fields. */
static const gdb_byte *
read_full_die_1 (const struct die_reader_specs *reader,
struct die_info **diep, const gdb_byte *info_ptr,
int num_extra_attrs)
{
unsigned int abbrev_number, bytes_read, i;
const struct abbrev_info *abbrev;
struct die_info *die;
struct dwarf2_cu *cu = reader->cu;
bfd *abfd = reader->abfd;
sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
if (!abbrev_number)
{
*diep = NULL;
return info_ptr;
}
abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
if (!abbrev)
error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
abbrev_number,
bfd_get_filename (abfd));
die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
die->sect_off = sect_off;
die->tag = abbrev->tag;
die->abbrev = abbrev_number;
die->has_children = abbrev->has_children;
/* Make the result usable.
The caller needs to update num_attrs after adding the extra
attributes. */
die->num_attrs = abbrev->num_attrs;
bool any_need_reprocess = false;
for (i = 0; i < abbrev->num_attrs; ++i)
{
info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
info_ptr);
if (die->attrs[i].requires_reprocessing_p ())
any_need_reprocess = true;
}
struct attribute *attr = die->attr (DW_AT_str_offsets_base);
if (attr != nullptr && attr->form_is_unsigned ())
cu->str_offsets_base = attr->as_unsigned ();
attr = die->attr (DW_AT_loclists_base);
if (attr != nullptr)
cu->loclist_base = attr->as_unsigned ();
auto maybe_addr_base = die->addr_base ();
if (maybe_addr_base.has_value ())
cu->addr_base = *maybe_addr_base;
attr = die->attr (DW_AT_rnglists_base);
if (attr != nullptr)
cu->rnglists_base = attr->as_unsigned ();
if (any_need_reprocess)
{
for (i = 0; i < abbrev->num_attrs; ++i)
{
if (die->attrs[i].requires_reprocessing_p ())
read_attribute_reprocess (reader, &die->attrs[i], die->tag);
}
}
*diep = die;
return info_ptr;
}
/* Read a die and all its attributes.
Set DIEP to point to a newly allocated die with its information,
except for its child, sibling, and parent fields. */
static const gdb_byte *
read_full_die (const struct die_reader_specs *reader,
struct die_info **diep, const gdb_byte *info_ptr)
{
const gdb_byte *result;
result = read_full_die_1 (reader, diep, info_ptr, 0);
if (dwarf_die_debug)
{
fprintf_unfiltered (gdb_stdlog,
"Read die from %s@0x%x of %s:\n",
reader->die_section->get_name (),
(unsigned) (info_ptr - reader->die_section->buffer),
bfd_get_filename (reader->abfd));
dump_die (*diep, dwarf_die_debug);
}
return result;
}
/* Returns nonzero if TAG represents a type that we might generate a partial
symbol for. */
static int
is_type_tag_for_partial (int tag, enum language lang)
{
switch (tag)
{
#if 0
/* Some types that would be reasonable to generate partial symbols for,
that we don't at present. Note that normally this does not
matter, mainly because C compilers don't give names to these
types, but instead emit DW_TAG_typedef. */
case DW_TAG_file_type:
case DW_TAG_ptr_to_member_type:
case DW_TAG_set_type:
case DW_TAG_string_type:
case DW_TAG_subroutine_type:
#endif
/* GNAT may emit an array with a name, but no typedef, so we
need to make a symbol in this case. */
case DW_TAG_array_type:
return lang == language_ada;
case DW_TAG_base_type:
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_enumeration_type:
case DW_TAG_structure_type:
case DW_TAG_subrange_type:
case DW_TAG_typedef:
case DW_TAG_union_type:
return 1;
default:
return 0;
}
}
/* Load all DIEs that are interesting for partial symbols into memory. */
static struct partial_die_info *
load_partial_dies (const struct die_reader_specs *reader,
const gdb_byte *info_ptr, int building_psymtab)
{
struct dwarf2_cu *cu = reader->cu;
struct objfile *objfile = cu->per_objfile->objfile;
struct partial_die_info *parent_die, *last_die, *first_die = NULL;
unsigned int bytes_read;
unsigned int load_all = 0;
int nesting_level = 1;
parent_die = NULL;
last_die = NULL;
gdb_assert (cu->per_cu != NULL);
if (cu->load_all_dies)
load_all = 1;
cu->partial_dies
= htab_create_alloc_ex (cu->header.length / 12,
partial_die_hash,
partial_die_eq,
NULL,
&cu->comp_unit_obstack,
hashtab_obstack_allocate,
dummy_obstack_deallocate);
while (1)
{
const abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr,
&bytes_read);
/* A NULL abbrev means the end of a series of children. */
if (abbrev == NULL)
{
if (--nesting_level == 0)
return first_die;
info_ptr += bytes_read;
last_die = parent_die;
parent_die = parent_die->die_parent;
continue;
}
/* Check for template arguments. We never save these; if
they're seen, we just mark the parent, and go on our way. */
if (parent_die != NULL
&& cu->per_cu->lang == language_cplus
&& (abbrev->tag == DW_TAG_template_type_param
|| abbrev->tag == DW_TAG_template_value_param))
{
parent_die->has_template_arguments = 1;
if (!load_all)
{
/* We don't need a partial DIE for the template argument. */
info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
continue;
}
}
/* We only recurse into c++ subprograms looking for template arguments.
Skip their other children. */
if (!load_all
&& cu->per_cu->lang == language_cplus
&& parent_die != NULL
&& parent_die->tag == DW_TAG_subprogram
&& abbrev->tag != DW_TAG_inlined_subroutine)
{
info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
continue;
}
/* Check whether this DIE is interesting enough to save. Normally
we would not be interested in members here, but there may be
later variables referencing them via DW_AT_specification (for
static members). */
if (!load_all
&& !is_type_tag_for_partial (abbrev->tag, cu->per_cu->lang)
&& abbrev->tag != DW_TAG_constant
&& abbrev->tag != DW_TAG_enumerator
&& abbrev->tag != DW_TAG_subprogram
&& abbrev->tag != DW_TAG_inlined_subroutine
&& abbrev->tag != DW_TAG_lexical_block
&& abbrev->tag != DW_TAG_variable
&& abbrev->tag != DW_TAG_namespace
&& abbrev->tag != DW_TAG_module
&& abbrev->tag != DW_TAG_member
&& abbrev->tag != DW_TAG_imported_unit
&& abbrev->tag != DW_TAG_imported_declaration)
{
/* Otherwise we skip to the next sibling, if any. */
info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
continue;
}
struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
abbrev);
info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
/* This two-pass algorithm for processing partial symbols has a
high cost in cache pressure. Thus, handle some simple cases
here which cover the majority of C partial symbols. DIEs
which neither have specification tags in them, nor could have
specification tags elsewhere pointing at them, can simply be
processed and discarded.
This segment is also optional; scan_partial_symbols and
add_partial_symbol will handle these DIEs if we chain
them in normally. When compilers which do not emit large
quantities of duplicate debug information are more common,
this code can probably be removed. */
/* Any complete simple types at the top level (pretty much all
of them, for a language without namespaces), can be processed
directly. */
if (parent_die == NULL
&& pdi.has_specification == 0
&& pdi.is_declaration == 0
&& ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
|| pdi.tag == DW_TAG_base_type
|| pdi.tag == DW_TAG_array_type
|| pdi.tag == DW_TAG_subrange_type))
{
if (building_psymtab && pdi.raw_name != NULL)
add_partial_symbol (&pdi, cu);
info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
continue;
}
/* The exception for DW_TAG_typedef with has_children above is
a workaround of GCC PR debug/47510. In the case of this complaint
type_name_or_error will error on such types later.
GDB skipped children of DW_TAG_typedef by the shortcut above and then
it could not find the child DIEs referenced later, this is checked
above. In correct DWARF DW_TAG_typedef should have no children. */
if (pdi.tag == DW_TAG_typedef && pdi.has_children)
complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
"- DIE at %s [in module %s]"),
sect_offset_str (pdi.sect_off), objfile_name (objfile));
/* If we're at the second level, and we're an enumerator, and
our parent has no specification (meaning possibly lives in a
namespace elsewhere), then we can add the partial symbol now
instead of queueing it. */
if (pdi.tag == DW_TAG_enumerator
&& parent_die != NULL
&& parent_die->die_parent == NULL
&& parent_die->tag == DW_TAG_enumeration_type
&& parent_die->has_specification == 0)
{
if (pdi.raw_name == NULL)
complaint (_("malformed enumerator DIE ignored"));
else if (building_psymtab)
add_partial_symbol (&pdi, cu);
info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
continue;
}
struct partial_die_info *part_die
= new (&cu->comp_unit_obstack) partial_die_info (pdi);
/* We'll save this DIE so link it in. */
part_die->die_parent = parent_die;
part_die->die_sibling = NULL;
part_die->die_child = NULL;
if (last_die && last_die == parent_die)
last_die->die_child = part_die;
else if (last_die)
last_die->die_sibling = part_die;
last_die = part_die;
if (first_die == NULL)
first_die = part_die;
/* Maybe add the DIE to the hash table. Not all DIEs that we
find interesting need to be in the hash table, because we
also have the parent/sibling/child chains; only those that we
might refer to by offset later during partial symbol reading.
For now this means things that might have be the target of a
DW_AT_specification, DW_AT_abstract_origin, or
DW_AT_extension. DW_AT_extension will refer only to
namespaces; DW_AT_abstract_origin refers to functions (and
many things under the function DIE, but we do not recurse
into function DIEs during partial symbol reading) and
possibly variables as well; DW_AT_specification refers to
declarations. Declarations ought to have the DW_AT_declaration
flag. It happens that GCC forgets to put it in sometimes, but
only for functions, not for types.
Adding more things than necessary to the hash table is harmless
except for the performance cost. Adding too few will result in
wasted time in find_partial_die, when we reread the compilation
unit with load_all_dies set. */
if (load_all
|| abbrev->tag == DW_TAG_constant
|| abbrev->tag == DW_TAG_subprogram
|| abbrev->tag == DW_TAG_variable
|| abbrev->tag == DW_TAG_namespace
|| part_die->is_declaration)
{
void **slot;
slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
to_underlying (part_die->sect_off),
INSERT);
*slot = part_die;
}
/* For some DIEs we want to follow their children (if any). For C
we have no reason to follow the children of structures; for other
languages we have to, so that we can get at method physnames
to infer fully qualified class names, for DW_AT_specification,
and for C++ template arguments. For C++, we also look one level
inside functions to find template arguments (if the name of the
function does not already contain the template arguments).
For Ada and Fortran, we need to scan the children of subprograms
and lexical blocks as well because these languages allow the
definition of nested entities that could be interesting for the
debugger, such as nested subprograms for instance. */
if (last_die->has_children
&& (load_all
|| last_die->tag == DW_TAG_namespace
|| last_die->tag == DW_TAG_module
|| last_die->tag == DW_TAG_enumeration_type
|| (cu->per_cu->lang == language_cplus
&& last_die->tag == DW_TAG_subprogram
&& (last_die->raw_name == NULL
|| strchr (last_die->raw_name, '<') == NULL))
|| (cu->per_cu->lang != language_c
&& (last_die->tag == DW_TAG_class_type
|| last_die->tag == DW_TAG_interface_type
|| last_die->tag == DW_TAG_structure_type
|| last_die->tag == DW_TAG_union_type))
|| ((cu->per_cu->lang == language_ada
|| cu->per_cu->lang == language_fortran)
&& (last_die->tag == DW_TAG_subprogram
|| last_die->tag == DW_TAG_lexical_block))))
{
nesting_level++;
parent_die = last_die;
continue;
}
/* Otherwise we skip to the next sibling, if any. */
info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
/* Back to the top, do it again. */
}
}
partial_die_info::partial_die_info (sect_offset sect_off_,
const struct abbrev_info *abbrev)
: partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
{
}
/* See class definition. */
const char *
partial_die_info::name (dwarf2_cu *cu)
{
if (!canonical_name && raw_name != nullptr)
{
struct objfile *objfile = cu->per_objfile->objfile;
raw_name = dwarf2_canonicalize_name (raw_name, cu, objfile);
canonical_name = 1;
}
return raw_name;
}
/* Read a minimal amount of information into the minimal die structure.
INFO_PTR should point just after the initial uleb128 of a DIE. */
const gdb_byte *
partial_die_info::read (const struct die_reader_specs *reader,
const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
{
struct dwarf2_cu *cu = reader->cu;
dwarf2_per_objfile *per_objfile = cu->per_objfile;
unsigned int i;
int has_low_pc_attr = 0;
int has_high_pc_attr = 0;
int high_pc_relative = 0;
for (i = 0; i < abbrev.num_attrs; ++i)
{
attribute attr;
info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
/* String and address offsets that need to do the reprocessing have
already been read at this point, so there is no need to wait until
the loop terminates to do the reprocessing. */
if (attr.requires_reprocessing_p ())
read_attribute_reprocess (reader, &attr, tag);
/* Store the data if it is of an attribute we want to keep in a
partial symbol table. */
switch (attr.name)
{
case DW_AT_name:
switch (tag)
{
case DW_TAG_compile_unit:
case DW_TAG_partial_unit:
case DW_TAG_type_unit:
/* Compilation units have a DW_AT_name that is a filename, not
a source language identifier. */
case DW_TAG_enumeration_type:
case DW_TAG_enumerator:
/* These tags always have simple identifiers already; no need
to canonicalize them. */
canonical_name = 1;
raw_name = attr.as_string ();
break;
default:
canonical_name = 0;
raw_name = attr.as_string ();
break;
}
break;
case DW_AT_linkage_name:
case DW_AT_MIPS_linkage_name:
/* Note that both forms of linkage name might appear. We
assume they will be the same, and we only store the last
one we see. */
linkage_name = attr.as_string ();
break;
case DW_AT_low_pc:
has_low_pc_attr = 1;
lowpc = attr.as_address ();
break;
case DW_AT_high_pc:
has_high_pc_attr = 1;
highpc = attr.as_address ();
if (cu->header.version >= 4 && attr.form_is_constant ())
high_pc_relative = 1;
break;
case DW_AT_location:
/* Support the .debug_loc offsets. */
if (attr.form_is_block ())
{
d.locdesc = attr.as_block ();
}
else if (attr.form_is_section_offset ())
{
dwarf2_complex_location_expr_complaint ();
}
else
{
dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
"partial symbol information");
}
break;
case DW_AT_external:
is_external = attr.as_boolean ();
break;
case DW_AT_declaration:
is_declaration = attr.as_boolean ();
break;
case DW_AT_type:
has_type = 1;
break;
case DW_AT_abstract_origin:
case DW_AT_specification:
case DW_AT_extension:
has_specification = 1;
spec_offset = attr.get_ref_die_offset ();
spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
|| cu->per_cu->is_dwz);
break;
case DW_AT_sibling:
/* Ignore absolute siblings, they might point outside of
the current compile unit. */
if (attr.form == DW_FORM_ref_addr)
complaint (_("ignoring absolute DW_AT_sibling"));
else
{
const gdb_byte *buffer = reader->buffer;
sect_offset off = attr.get_ref_die_offset ();
const gdb_byte *sibling_ptr = buffer + to_underlying (off);
if (sibling_ptr < info_ptr)
complaint (_("DW_AT_sibling points backwards"));
else if (sibling_ptr > reader->buffer_end)
reader->die_section->overflow_complaint ();
else
sibling = sibling_ptr;
}
break;
case DW_AT_byte_size:
has_byte_size = 1;
break;
case DW_AT_const_value:
has_const_value = 1;
break;
case DW_AT_calling_convention:
/* DWARF doesn't provide a way to identify a program's source-level
entry point. DW_AT_calling_convention attributes are only meant
to describe functions' calling conventions.
However, because it's a necessary piece of information in
Fortran, and before DWARF 4 DW_CC_program was the only
piece of debugging information whose definition refers to
a 'main program' at all, several compilers marked Fortran
main programs with DW_CC_program --- even when those
functions use the standard calling conventions.
Although DWARF now specifies a way to provide this
information, we support this practice for backward
compatibility. */
if (attr.constant_value (0) == DW_CC_program
&& cu->per_cu->lang == language_fortran)
main_subprogram = 1;
break;
case DW_AT_inline:
{
LONGEST value = attr.constant_value (-1);
if (value == DW_INL_inlined
|| value == DW_INL_declared_inlined)
may_be_inlined = 1;
}
break;
case DW_AT_import:
if (tag == DW_TAG_imported_unit)
{
d.sect_off = attr.get_ref_die_offset ();
is_dwz = (attr.form == DW_FORM_GNU_ref_alt
|| cu->per_cu->is_dwz);
}
break;
case DW_AT_main_subprogram:
main_subprogram = attr.as_boolean ();
break;
case DW_AT_ranges:
{
/* Offset in the .debug_ranges or .debug_rnglist section (depending
on DWARF version). */
ranges_offset = attr.as_unsigned ();
/* See dwarf2_cu::gnu_ranges_base's doc for why we might want to add
this value. */
if (tag != DW_TAG_compile_unit)
ranges_offset += cu->gnu_ranges_base;
has_range_info = 1;
}
break;
default:
break;
}
}
/* For Ada, if both the name and the linkage name appear, we prefer
the latter. This lets "catch exception" work better, regardless
of the order in which the name and linkage name were emitted.
Really, though, this is just a workaround for the fact that gdb
doesn't store both the name and the linkage name. */
if (cu->per_cu->lang == language_ada && linkage_name != nullptr)
raw_name = linkage_name;
if (high_pc_relative)
highpc += lowpc;
if (has_low_pc_attr && has_high_pc_attr)
{
/* When using the GNU linker, .gnu.linkonce. sections are used to
eliminate duplicate copies of functions and vtables and such.
The linker will arbitrarily choose one and discard the others.
The AT_*_pc values for such functions refer to local labels in
these sections. If the section from that file was discarded, the
labels are not in the output, so the relocs get a value of 0.
If this is a discarded function, mark the pc bounds as invalid,
so that GDB will ignore it. */
if (lowpc == 0 && !per_objfile->per_bfd->has_section_at_zero)
{
struct objfile *objfile = per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
complaint (_("DW_AT_low_pc %s is zero "
"for DIE at %s [in module %s]"),
paddress (gdbarch, lowpc),
sect_offset_str (sect_off),
objfile_name (objfile));
}
/* dwarf2_get_pc_bounds has also the strict low < high requirement. */
else if (lowpc >= highpc)
{
struct objfile *objfile = per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
"for DIE at %s [in module %s]"),
paddress (gdbarch, lowpc),
paddress (gdbarch, highpc),
sect_offset_str (sect_off),
objfile_name (objfile));
}
else
has_pc_info = 1;
}
return info_ptr;
}
/* Find a cached partial DIE at OFFSET in CU. */
struct partial_die_info *
dwarf2_cu::find_partial_die (sect_offset sect_off)
{
struct partial_die_info *lookup_die = NULL;
struct partial_die_info part_die (sect_off);
lookup_die = ((struct partial_die_info *)
htab_find_with_hash (partial_dies, &part_die,
to_underlying (sect_off)));
return lookup_die;
}
/* Find a partial DIE at OFFSET, which may or may not be in CU,
except in the case of .debug_types DIEs which do not reference
outside their CU (they do however referencing other types via
DW_FORM_ref_sig8). */
static const struct cu_partial_die_info
find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct partial_die_info *pd = NULL;
if (offset_in_dwz == cu->per_cu->is_dwz
&& cu->header.offset_in_cu_p (sect_off))
{
pd = cu->find_partial_die (sect_off);
if (pd != NULL)
return { cu, pd };
/* We missed recording what we needed.
Load all dies and try again. */
}
else
{
/* TUs don't reference other CUs/TUs (except via type signatures). */
if (cu->per_cu->is_debug_types)
{
error (_("Dwarf Error: Type Unit at offset %s contains"
" external reference to offset %s [in module %s].\n"),
sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
bfd_get_filename (objfile->obfd));
}
dwarf2_per_cu_data *per_cu
= dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
per_objfile);
cu = per_objfile->get_cu (per_cu);
if (cu == NULL || cu->partial_dies == NULL)
load_partial_comp_unit (per_cu, per_objfile, nullptr);
cu = per_objfile->get_cu (per_cu);
cu->last_used = 0;
pd = cu->find_partial_die (sect_off);
}
/* If we didn't find it, and not all dies have been loaded,
load them all and try again. */
if (pd == NULL && cu->load_all_dies == 0)
{
cu->load_all_dies = 1;
/* This is nasty. When we reread the DIEs, somewhere up the call chain
THIS_CU->cu may already be in use. So we can't just free it and
replace its DIEs with the ones we read in. Instead, we leave those
DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
and clobber THIS_CU->cu->partial_dies with the hash table for the new
set. */
load_partial_comp_unit (cu->per_cu, per_objfile, cu);
pd = cu->find_partial_die (sect_off);
}
if (pd == NULL)
error (_("Dwarf Error: Cannot find DIE at %s [from module %s]\n"),
sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
return { cu, pd };
}
/* See if we can figure out if the class lives in a namespace. We do
this by looking for a member function; its demangled name will
contain namespace info, if there is any. */
static void
guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
struct dwarf2_cu *cu)
{
/* NOTE: carlton/2003-10-07: Getting the info this way changes
what template types look like, because the demangler
frequently doesn't give the same name as the debug info. We
could fix this by only using the demangled name to get the
prefix (but see comment in read_structure_type). */
struct partial_die_info *real_pdi;
struct partial_die_info *child_pdi;
/* If this DIE (this DIE's specification, if any) has a parent, then
we should not do this. We'll prepend the parent's fully qualified
name when we create the partial symbol. */
real_pdi = struct_pdi;
while (real_pdi->has_specification)
{
auto res = find_partial_die (real_pdi->spec_offset,
real_pdi->spec_is_dwz, cu);
real_pdi = res.pdi;
cu = res.cu;
}
if (real_pdi->die_parent != NULL)
return;
for (child_pdi = struct_pdi->die_child;
child_pdi != NULL;
child_pdi = child_pdi->die_sibling)
{
if (child_pdi->tag == DW_TAG_subprogram
&& child_pdi->linkage_name != NULL)
{
gdb::unique_xmalloc_ptr<char> actual_class_name
(cu->language_defn->class_name_from_physname
(child_pdi->linkage_name));
if (actual_class_name != NULL)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct_pdi->raw_name = objfile->intern (actual_class_name.get ());
struct_pdi->canonical_name = 1;
}
break;
}
}
}
/* Return true if a DIE with TAG may have the DW_AT_const_value
attribute. */
static bool
can_have_DW_AT_const_value_p (enum dwarf_tag tag)
{
switch (tag)
{
case DW_TAG_constant:
case DW_TAG_enumerator:
case DW_TAG_formal_parameter:
case DW_TAG_template_value_param:
case DW_TAG_variable:
return true;
}
return false;
}
void
partial_die_info::fixup (struct dwarf2_cu *cu)
{
/* Once we've fixed up a die, there's no point in doing so again.
This also avoids a memory leak if we were to call
guess_partial_die_structure_name multiple times. */
if (fixup_called)
return;
/* If we found a reference attribute and the DIE has no name, try
to find a name in the referred to DIE. */
if (raw_name == NULL && has_specification)
{
struct partial_die_info *spec_die;
auto res = find_partial_die (spec_offset, spec_is_dwz, cu);
spec_die = res.pdi;
cu = res.cu;
spec_die->fixup (cu);
if (spec_die->raw_name)
{
raw_name = spec_die->raw_name;
canonical_name = spec_die->canonical_name;
/* Copy DW_AT_external attribute if it is set. */
if (spec_die->is_external)
is_external = spec_die->is_external;
}
}
if (!has_const_value && has_specification
&& can_have_DW_AT_const_value_p (tag))
{
struct partial_die_info *spec_die;
auto res = find_partial_die (spec_offset, spec_is_dwz, cu);
spec_die = res.pdi;
cu = res.cu;
spec_die->fixup (cu);
if (spec_die->has_const_value)
{
/* Copy DW_AT_const_value attribute if it is set. */
has_const_value = spec_die->has_const_value;
}
}
/* Set default names for some unnamed DIEs. */
if (raw_name == NULL && tag == DW_TAG_namespace)
{
raw_name = CP_ANONYMOUS_NAMESPACE_STR;
canonical_name = 1;
}
/* If there is no parent die to provide a namespace, and there are
children, see if we can determine the namespace from their linkage
name. */
if (cu->per_cu->lang == language_cplus
&& !cu->per_objfile->per_bfd->types.empty ()
&& die_parent == NULL
&& has_children
&& (tag == DW_TAG_class_type
|| tag == DW_TAG_structure_type
|| tag == DW_TAG_union_type))
guess_partial_die_structure_name (this, cu);
/* GCC might emit a nameless struct or union that has a linkage
name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
if (raw_name == NULL
&& (tag == DW_TAG_class_type
|| tag == DW_TAG_interface_type
|| tag == DW_TAG_structure_type
|| tag == DW_TAG_union_type)
&& linkage_name != NULL)
{
gdb::unique_xmalloc_ptr<char> demangled
(gdb_demangle (linkage_name, DMGL_TYPES));
if (demangled != nullptr)
{
const char *base;
/* Strip any leading namespaces/classes, keep only the base name.
DW_AT_name for named DIEs does not contain the prefixes. */
base = strrchr (demangled.get (), ':');
if (base && base > demangled.get () && base[-1] == ':')
base++;
else
base = demangled.get ();
struct objfile *objfile = cu->per_objfile->objfile;
raw_name = objfile->intern (base);
canonical_name = 1;
}
}
fixup_called = 1;
}
/* Read the .debug_loclists or .debug_rnglists header (they are the same format)
contents from the given SECTION in the HEADER.
HEADER_OFFSET is the offset of the header in the section. */
static void
read_loclists_rnglists_header (struct loclists_rnglists_header *header,
struct dwarf2_section_info *section,
sect_offset header_offset)
{
unsigned int bytes_read;
bfd *abfd = section->get_bfd_owner ();
const gdb_byte *info_ptr = section->buffer + to_underlying (header_offset);
header->length = read_initial_length (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
header->version = read_2_bytes (abfd, info_ptr);
info_ptr += 2;
header->addr_size = read_1_byte (abfd, info_ptr);
info_ptr += 1;
header->segment_collector_size = read_1_byte (abfd, info_ptr);
info_ptr += 1;
header->offset_entry_count = read_4_bytes (abfd, info_ptr);
}
/* Return the DW_AT_loclists_base value for the CU. */
static ULONGEST
lookup_loclist_base (struct dwarf2_cu *cu)
{
/* For the .dwo unit, the loclist_base points to the first offset following
the header. The header consists of the following entities-
1. Unit Length (4 bytes for 32 bit DWARF format, and 12 bytes for the 64
bit format)
2. version (2 bytes)
3. address size (1 byte)
4. segment selector size (1 byte)
5. offset entry count (4 bytes)
These sizes are derived as per the DWARFv5 standard. */
if (cu->dwo_unit != nullptr)
{
if (cu->header.initial_length_size == 4)
return LOCLIST_HEADER_SIZE32;
return LOCLIST_HEADER_SIZE64;
}
return cu->loclist_base;
}
/* Given a DW_FORM_loclistx value LOCLIST_INDEX, fetch the offset from the
array of offsets in the .debug_loclists section. */
static sect_offset
read_loclist_index (struct dwarf2_cu *cu, ULONGEST loclist_index)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
bfd *abfd = objfile->obfd;
ULONGEST loclist_header_size =
(cu->header.initial_length_size == 4 ? LOCLIST_HEADER_SIZE32
: LOCLIST_HEADER_SIZE64);
ULONGEST loclist_base = lookup_loclist_base (cu);
/* Offset in .debug_loclists of the offset for LOCLIST_INDEX. */
ULONGEST start_offset =
loclist_base + loclist_index * cu->header.offset_size;
/* Get loclists section. */
struct dwarf2_section_info *section = cu_debug_loc_section (cu);
/* Read the loclists section content. */
section->read (objfile);
if (section->buffer == NULL)
error (_("DW_FORM_loclistx used without .debug_loclists "
"section [in module %s]"), objfile_name (objfile));
/* DW_AT_loclists_base points after the .debug_loclists contribution header,
so if loclist_base is smaller than the header size, we have a problem. */
if (loclist_base < loclist_header_size)
error (_("DW_AT_loclists_base is smaller than header size [in module %s]"),
objfile_name (objfile));
/* Read the header of the loclists contribution. */
struct loclists_rnglists_header header;
read_loclists_rnglists_header (&header, section,
(sect_offset) (loclist_base - loclist_header_size));
/* Verify the loclist index is valid. */
if (loclist_index >= header.offset_entry_count)
error (_("DW_FORM_loclistx pointing outside of "
".debug_loclists offset array [in module %s]"),
objfile_name (objfile));
/* Validate that reading won't go beyond the end of the section. */
if (start_offset + cu->header.offset_size > section->size)
error (_("Reading DW_FORM_loclistx index beyond end of"
".debug_loclists section [in module %s]"),
objfile_name (objfile));
const gdb_byte *info_ptr = section->buffer + start_offset;
if (cu->header.offset_size == 4)
return (sect_offset) (bfd_get_32 (abfd, info_ptr) + loclist_base);
else
return (sect_offset) (bfd_get_64 (abfd, info_ptr) + loclist_base);
}
/* Given a DW_FORM_rnglistx value RNGLIST_INDEX, fetch the offset from the
array of offsets in the .debug_rnglists section. */
static sect_offset
read_rnglist_index (struct dwarf2_cu *cu, ULONGEST rnglist_index,
dwarf_tag tag)
{
struct dwarf2_per_objfile *dwarf2_per_objfile = cu->per_objfile;
struct objfile *objfile = dwarf2_per_objfile->objfile;
bfd *abfd = objfile->obfd;
ULONGEST rnglist_header_size =
(cu->header.initial_length_size == 4 ? RNGLIST_HEADER_SIZE32
: RNGLIST_HEADER_SIZE64);
/* When reading a DW_FORM_rnglistx from a DWO, we read from the DWO's
.debug_rnglists.dwo section. The rnglists base given in the skeleton
doesn't apply. */
ULONGEST rnglist_base =
(cu->dwo_unit != nullptr) ? rnglist_header_size : cu->rnglists_base;
/* Offset in .debug_rnglists of the offset for RNGLIST_INDEX. */
ULONGEST start_offset =
rnglist_base + rnglist_index * cu->header.offset_size;
/* Get rnglists section. */
struct dwarf2_section_info *section = cu_debug_rnglists_section (cu, tag);
/* Read the rnglists section content. */
section->read (objfile);
if (section->buffer == nullptr)
error (_("DW_FORM_rnglistx used without .debug_rnglists section "
"[in module %s]"),
objfile_name (objfile));
/* DW_AT_rnglists_base points after the .debug_rnglists contribution header,
so if rnglist_base is smaller than the header size, we have a problem. */
if (rnglist_base < rnglist_header_size)
error (_("DW_AT_rnglists_base is smaller than header size [in module %s]"),
objfile_name (objfile));
/* Read the header of the rnglists contribution. */
struct loclists_rnglists_header header;
read_loclists_rnglists_header (&header, section,
(sect_offset) (rnglist_base - rnglist_header_size));
/* Verify the rnglist index is valid. */
if (rnglist_index >= header.offset_entry_count)
error (_("DW_FORM_rnglistx index pointing outside of "
".debug_rnglists offset array [in module %s]"),
objfile_name (objfile));
/* Validate that reading won't go beyond the end of the section. */
if (start_offset + cu->header.offset_size > section->size)
error (_("Reading DW_FORM_rnglistx index beyond end of"
".debug_rnglists section [in module %s]"),
objfile_name (objfile));
const gdb_byte *info_ptr = section->buffer + start_offset;
if (cu->header.offset_size == 4)
return (sect_offset) (read_4_bytes (abfd, info_ptr) + rnglist_base);
else
return (sect_offset) (read_8_bytes (abfd, info_ptr) + rnglist_base);
}
/* Process the attributes that had to be skipped in the first round. These
attributes are the ones that need str_offsets_base or addr_base attributes.
They could not have been processed in the first round, because at the time
the values of str_offsets_base or addr_base may not have been known. */
static void
read_attribute_reprocess (const struct die_reader_specs *reader,
struct attribute *attr, dwarf_tag tag)
{
struct dwarf2_cu *cu = reader->cu;
switch (attr->form)
{
case DW_FORM_addrx:
case DW_FORM_GNU_addr_index:
attr->set_address (read_addr_index (cu,
attr->as_unsigned_reprocess ()));
break;
case DW_FORM_loclistx:
{
sect_offset loclists_sect_off
= read_loclist_index (cu, attr->as_unsigned_reprocess ());
attr->set_unsigned (to_underlying (loclists_sect_off));
}
break;
case DW_FORM_rnglistx:
{
sect_offset rnglists_sect_off
= read_rnglist_index (cu, attr->as_unsigned_reprocess (), tag);
attr->set_unsigned (to_underlying (rnglists_sect_off));
}
break;
case DW_FORM_strx:
case DW_FORM_strx1:
case DW_FORM_strx2:
case DW_FORM_strx3:
case DW_FORM_strx4:
case DW_FORM_GNU_str_index:
{
unsigned int str_index = attr->as_unsigned_reprocess ();
gdb_assert (!attr->canonical_string_p ());
if (reader->dwo_file != NULL)
attr->set_string_noncanonical (read_dwo_str_index (reader,
str_index));
else
attr->set_string_noncanonical (read_stub_str_index (cu,
str_index));
break;
}
default:
gdb_assert_not_reached (_("Unexpected DWARF form."));
}
}
/* Read an attribute value described by an attribute form. */
static const gdb_byte *
read_attribute_value (const struct die_reader_specs *reader,
struct attribute *attr, unsigned form,
LONGEST implicit_const, const gdb_byte *info_ptr)
{
struct dwarf2_cu *cu = reader->cu;
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
bfd *abfd = reader->abfd;
struct comp_unit_head *cu_header = &cu->header;
unsigned int bytes_read;
struct dwarf_block *blk;
attr->form = (enum dwarf_form) form;
switch (form)
{
case DW_FORM_ref_addr:
if (cu_header->version == 2)
attr->set_unsigned (cu_header->read_address (abfd, info_ptr,
&bytes_read));
else
attr->set_unsigned (cu_header->read_offset (abfd, info_ptr,
&bytes_read));
info_ptr += bytes_read;
break;
case DW_FORM_GNU_ref_alt:
attr->set_unsigned (cu_header->read_offset (abfd, info_ptr,
&bytes_read));
info_ptr += bytes_read;
break;
case DW_FORM_addr:
{
struct gdbarch *gdbarch = objfile->arch ();
CORE_ADDR addr = cu_header->read_address (abfd, info_ptr, &bytes_read);
addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr);
attr->set_address (addr);
info_ptr += bytes_read;
}
break;
case DW_FORM_block2:
blk = dwarf_alloc_block (cu);
blk->size = read_2_bytes (abfd, info_ptr);
info_ptr += 2;
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
info_ptr += blk->size;
attr->set_block (blk);
break;
case DW_FORM_block4:
blk = dwarf_alloc_block (cu);
blk->size = read_4_bytes (abfd, info_ptr);
info_ptr += 4;
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
info_ptr += blk->size;
attr->set_block (blk);
break;
case DW_FORM_data2:
attr->set_unsigned (read_2_bytes (abfd, info_ptr));
info_ptr += 2;
break;
case DW_FORM_data4:
attr->set_unsigned (read_4_bytes (abfd, info_ptr));
info_ptr += 4;
break;
case DW_FORM_data8:
attr->set_unsigned (read_8_bytes (abfd, info_ptr));
info_ptr += 8;
break;
case DW_FORM_data16:
blk = dwarf_alloc_block (cu);
blk->size = 16;
blk->data = read_n_bytes (abfd, info_ptr, 16);
info_ptr += 16;
attr->set_block (blk);
break;
case DW_FORM_sec_offset:
attr->set_unsigned (cu_header->read_offset (abfd, info_ptr,
&bytes_read));
info_ptr += bytes_read;
break;
case DW_FORM_loclistx:
{
attr->set_unsigned_reprocess (read_unsigned_leb128 (abfd, info_ptr,
&bytes_read));
info_ptr += bytes_read;
}
break;
case DW_FORM_string:
attr->set_string_noncanonical (read_direct_string (abfd, info_ptr,
&bytes_read));
info_ptr += bytes_read;
break;
case DW_FORM_strp:
if (!cu->per_cu->is_dwz)
{
attr->set_string_noncanonical
(read_indirect_string (per_objfile,
abfd, info_ptr, cu_header,
&bytes_read));
info_ptr += bytes_read;
break;
}
/* FALLTHROUGH */
case DW_FORM_line_strp:
if (!cu->per_cu->is_dwz)
{
attr->set_string_noncanonical
(per_objfile->read_line_string (info_ptr, cu_header,
&bytes_read));
info_ptr += bytes_read;
break;
}
/* FALLTHROUGH */
case DW_FORM_GNU_strp_alt:
{
dwz_file *dwz = dwarf2_get_dwz_file (per_objfile->per_bfd, true);
LONGEST str_offset = cu_header->read_offset (abfd, info_ptr,
&bytes_read);
attr->set_string_noncanonical
(dwz->read_string (objfile, str_offset));
info_ptr += bytes_read;
}
break;
case DW_FORM_exprloc:
case DW_FORM_block:
blk = dwarf_alloc_block (cu);
blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
info_ptr += blk->size;
attr->set_block (blk);
break;
case DW_FORM_block1:
blk = dwarf_alloc_block (cu);
blk->size = read_1_byte (abfd, info_ptr);
info_ptr += 1;
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
info_ptr += blk->size;
attr->set_block (blk);
break;
case DW_FORM_data1:
case DW_FORM_flag:
attr->set_unsigned (read_1_byte (abfd, info_ptr));
info_ptr += 1;
break;
case DW_FORM_flag_present:
attr->set_unsigned (1);
break;
case DW_FORM_sdata:
attr->set_signed (read_signed_leb128 (abfd, info_ptr, &bytes_read));
info_ptr += bytes_read;
break;
case DW_FORM_rnglistx:
{
attr->set_unsigned_reprocess (read_unsigned_leb128 (abfd, info_ptr,
&bytes_read));
info_ptr += bytes_read;
}
break;
case DW_FORM_udata:
attr->set_unsigned (read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
info_ptr += bytes_read;
break;
case DW_FORM_ref1:
attr->set_unsigned ((to_underlying (cu_header->sect_off)
+ read_1_byte (abfd, info_ptr)));
info_ptr += 1;
break;
case DW_FORM_ref2:
attr->set_unsigned ((to_underlying (cu_header->sect_off)
+ read_2_bytes (abfd, info_ptr)));
info_ptr += 2;
break;
case DW_FORM_ref4:
attr->set_unsigned ((to_underlying (cu_header->sect_off)
+ read_4_bytes (abfd, info_ptr)));
info_ptr += 4;
break;
case DW_FORM_ref8:
attr->set_unsigned ((to_underlying (cu_header->sect_off)
+ read_8_bytes (abfd, info_ptr)));
info_ptr += 8;
break;
case DW_FORM_ref_sig8:
attr->set_signature (read_8_bytes (abfd, info_ptr));
info_ptr += 8;
break;
case DW_FORM_ref_udata:
attr->set_unsigned ((to_underlying (cu_header->sect_off)
+ read_unsigned_leb128 (abfd, info_ptr,
&bytes_read)));
info_ptr += bytes_read;
break;
case DW_FORM_indirect:
form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
if (form == DW_FORM_implicit_const)
{
implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
}
info_ptr = read_attribute_value (reader, attr, form, implicit_const,
info_ptr);
break;
case DW_FORM_implicit_const:
attr->set_signed (implicit_const);
break;
case DW_FORM_addrx:
case DW_FORM_GNU_addr_index:
attr->set_unsigned_reprocess (read_unsigned_leb128 (abfd, info_ptr,
&bytes_read));
info_ptr += bytes_read;
break;
case DW_FORM_strx:
case DW_FORM_strx1:
case DW_FORM_strx2:
case DW_FORM_strx3:
case DW_FORM_strx4:
case DW_FORM_GNU_str_index:
{
ULONGEST str_index;
if (form == DW_FORM_strx1)
{
str_index = read_1_byte (abfd, info_ptr);
info_ptr += 1;
}
else if (form == DW_FORM_strx2)
{
str_index = read_2_bytes (abfd, info_ptr);
info_ptr += 2;
}
else if (form == DW_FORM_strx3)
{
str_index = read_3_bytes (abfd, info_ptr);
info_ptr += 3;
}
else if (form == DW_FORM_strx4)
{
str_index = read_4_bytes (abfd, info_ptr);
info_ptr += 4;
}
else
{
str_index = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
}
attr->set_unsigned_reprocess (str_index);
}
break;
default:
error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
dwarf_form_name (form),
bfd_get_filename (abfd));
}
/* Super hack. */
if (cu->per_cu->is_dwz && attr->form_is_ref ())
attr->form = DW_FORM_GNU_ref_alt;
/* We have seen instances where the compiler tried to emit a byte
size attribute of -1 which ended up being encoded as an unsigned
0xffffffff. Although 0xffffffff is technically a valid size value,
an object of this size seems pretty unlikely so we can relatively
safely treat these cases as if the size attribute was invalid and
treat them as zero by default. */
if (attr->name == DW_AT_byte_size
&& form == DW_FORM_data4
&& attr->as_unsigned () >= 0xffffffff)
{
complaint
(_("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
hex_string (attr->as_unsigned ()));
attr->set_unsigned (0);
}
return info_ptr;
}
/* Read an attribute described by an abbreviated attribute. */
static const gdb_byte *
read_attribute (const struct die_reader_specs *reader,
struct attribute *attr, const struct attr_abbrev *abbrev,
const gdb_byte *info_ptr)
{
attr->name = abbrev->name;
attr->string_is_canonical = 0;
attr->requires_reprocessing = 0;
return read_attribute_value (reader, attr, abbrev->form,
abbrev->implicit_const, info_ptr);
}
/* Return pointer to string at .debug_str offset STR_OFFSET. */
static const char *
read_indirect_string_at_offset (dwarf2_per_objfile *per_objfile,
LONGEST str_offset)
{
return per_objfile->per_bfd->str.read_string (per_objfile->objfile,
str_offset, "DW_FORM_strp");
}
/* Return pointer to string at .debug_str offset as read from BUF.
BUF is assumed to be in a compilation unit described by CU_HEADER.
Return *BYTES_READ_PTR count of bytes read from BUF. */
static const char *
read_indirect_string (dwarf2_per_objfile *per_objfile, bfd *abfd,
const gdb_byte *buf,
const struct comp_unit_head *cu_header,
unsigned int *bytes_read_ptr)
{
LONGEST str_offset = cu_header->read_offset (abfd, buf, bytes_read_ptr);
return read_indirect_string_at_offset (per_objfile, str_offset);
}
/* See read.h. */
const char *
dwarf2_per_objfile::read_line_string (const gdb_byte *buf,
const struct comp_unit_head *cu_header,
unsigned int *bytes_read_ptr)
{
bfd *abfd = objfile->obfd;
LONGEST str_offset = cu_header->read_offset (abfd, buf, bytes_read_ptr);
return per_bfd->line_str.read_string (objfile, str_offset, "DW_FORM_line_strp");
}
/* Given index ADDR_INDEX in .debug_addr, fetch the value.
ADDR_BASE is the DW_AT_addr_base (DW_AT_GNU_addr_base) attribute or zero.
ADDR_SIZE is the size of addresses from the CU header. */
static CORE_ADDR
read_addr_index_1 (dwarf2_per_objfile *per_objfile, unsigned int addr_index,
gdb::optional<ULONGEST> addr_base, int addr_size)
{
struct objfile *objfile = per_objfile->objfile;
bfd *abfd = objfile->obfd;
const gdb_byte *info_ptr;
ULONGEST addr_base_or_zero = addr_base.has_value () ? *addr_base : 0;
per_objfile->per_bfd->addr.read (objfile);
if (per_objfile->per_bfd->addr.buffer == NULL)
error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
objfile_name (objfile));
if (addr_base_or_zero + addr_index * addr_size
>= per_objfile->per_bfd->addr.size)
error (_("DW_FORM_addr_index pointing outside of "
".debug_addr section [in module %s]"),
objfile_name (objfile));
info_ptr = (per_objfile->per_bfd->addr.buffer + addr_base_or_zero
+ addr_index * addr_size);
if (addr_size == 4)
return bfd_get_32 (abfd, info_ptr);
else
return bfd_get_64 (abfd, info_ptr);
}
/* Given index ADDR_INDEX in .debug_addr, fetch the value. */
static CORE_ADDR
read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
{
return read_addr_index_1 (cu->per_objfile, addr_index,
cu->addr_base, cu->header.addr_size);
}
/* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
static CORE_ADDR
read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
unsigned int *bytes_read)
{
bfd *abfd = cu->per_objfile->objfile->obfd;
unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
return read_addr_index (cu, addr_index);
}
/* See read.h. */
CORE_ADDR
dwarf2_read_addr_index (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
unsigned int addr_index)
{
struct dwarf2_cu *cu = per_objfile->get_cu (per_cu);
gdb::optional<ULONGEST> addr_base;
int addr_size;
/* We need addr_base and addr_size.
If we don't have PER_CU->cu, we have to get it.
Nasty, but the alternative is storing the needed info in PER_CU,
which at this point doesn't seem justified: it's not clear how frequently
it would get used and it would increase the size of every PER_CU.
Entry points like dwarf2_per_cu_addr_size do a similar thing
so we're not in uncharted territory here.
Alas we need to be a bit more complicated as addr_base is contained
in the DIE.
We don't need to read the entire CU(/TU).
We just need the header and top level die.
IWBN to use the aging mechanism to let us lazily later discard the CU.
For now we skip this optimization. */
if (cu != NULL)
{
addr_base = cu->addr_base;
addr_size = cu->header.addr_size;
}
else
{
cutu_reader reader (per_cu, per_objfile, nullptr, nullptr, false);
addr_base = reader.cu->addr_base;
addr_size = reader.cu->header.addr_size;
}
return read_addr_index_1 (per_objfile, addr_index, addr_base, addr_size);
}
/* Given a DW_FORM_GNU_str_index value STR_INDEX, fetch the string.
STR_SECTION, STR_OFFSETS_SECTION can be from a Fission stub or a
DWO file. */
static const char *
read_str_index (struct dwarf2_cu *cu,
struct dwarf2_section_info *str_section,
struct dwarf2_section_info *str_offsets_section,
ULONGEST str_offsets_base, ULONGEST str_index)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
const char *objf_name = objfile_name (objfile);
bfd *abfd = objfile->obfd;
const gdb_byte *info_ptr;
ULONGEST str_offset;
static const char form_name[] = "DW_FORM_GNU_str_index or DW_FORM_strx";
str_section->read (objfile);
str_offsets_section->read (objfile);
if (str_section->buffer == NULL)
error (_("%s used without %s section"
" in CU at offset %s [in module %s]"),
form_name, str_section->get_name (),
sect_offset_str (cu->header.sect_off), objf_name);
if (str_offsets_section->buffer == NULL)
error (_("%s used without %s section"
" in CU at offset %s [in module %s]"),
form_name, str_section->get_name (),
sect_offset_str (cu->header.sect_off), objf_name);
info_ptr = (str_offsets_section->buffer
+ str_offsets_base
+ str_index * cu->header.offset_size);
if (cu->header.offset_size == 4)
str_offset = bfd_get_32 (abfd, info_ptr);
else
str_offset = bfd_get_64 (abfd, info_ptr);
if (str_offset >= str_section->size)
error (_("Offset from %s pointing outside of"
" .debug_str.dwo section in CU at offset %s [in module %s]"),
form_name, sect_offset_str (cu->header.sect_off), objf_name);
return (const char *) (str_section->buffer + str_offset);
}
/* Given a DW_FORM_GNU_str_index from a DWO file, fetch the string. */
static const char *
read_dwo_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
{
ULONGEST str_offsets_base = reader->cu->header.version >= 5
? reader->cu->header.addr_size : 0;
return read_str_index (reader->cu,
&reader->dwo_file->sections.str,
&reader->dwo_file->sections.str_offsets,
str_offsets_base, str_index);
}
/* Given a DW_FORM_GNU_str_index from a Fission stub, fetch the string. */
static const char *
read_stub_str_index (struct dwarf2_cu *cu, ULONGEST str_index)
{
struct objfile *objfile = cu->per_objfile->objfile;
const char *objf_name = objfile_name (objfile);
static const char form_name[] = "DW_FORM_GNU_str_index";
static const char str_offsets_attr_name[] = "DW_AT_str_offsets";
if (!cu->str_offsets_base.has_value ())
error (_("%s used in Fission stub without %s"
" in CU at offset 0x%lx [in module %s]"),
form_name, str_offsets_attr_name,
(long) cu->header.offset_size, objf_name);
return read_str_index (cu,
&cu->per_objfile->per_bfd->str,
&cu->per_objfile->per_bfd->str_offsets,
*cu->str_offsets_base, str_index);
}
/* Return the length of an LEB128 number in BUF. */
static int
leb128_size (const gdb_byte *buf)
{
const gdb_byte *begin = buf;
gdb_byte byte;
while (1)
{
byte = *buf++;
if ((byte & 128) == 0)
return buf - begin;
}
}
static enum language
dwarf_lang_to_enum_language (unsigned int lang)
{
enum language language;
switch (lang)
{
case DW_LANG_C89:
case DW_LANG_C99:
case DW_LANG_C11:
case DW_LANG_C:
case DW_LANG_UPC:
language = language_c;
break;
case DW_LANG_Java:
case DW_LANG_C_plus_plus:
case DW_LANG_C_plus_plus_11:
case DW_LANG_C_plus_plus_14:
language = language_cplus;
break;
case DW_LANG_D:
language = language_d;
break;
case DW_LANG_Fortran77:
case DW_LANG_Fortran90:
case DW_LANG_Fortran95:
case DW_LANG_Fortran03:
case DW_LANG_Fortran08:
language = language_fortran;
break;
case DW_LANG_Go:
language = language_go;
break;
case DW_LANG_Mips_Assembler:
language = language_asm;
break;
case DW_LANG_Ada83:
case DW_LANG_Ada95:
language = language_ada;
break;
case DW_LANG_Modula2:
language = language_m2;
break;
case DW_LANG_Pascal83:
language = language_pascal;
break;
case DW_LANG_ObjC:
language = language_objc;
break;
case DW_LANG_Rust:
case DW_LANG_Rust_old:
language = language_rust;
break;
case DW_LANG_OpenCL:
language = language_opencl;
break;
case DW_LANG_Cobol74:
case DW_LANG_Cobol85:
default:
language = language_minimal;
break;
}
return language;
}
/* Return the named attribute or NULL if not there. */
static struct attribute *
dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
{
for (;;)
{
unsigned int i;
struct attribute *spec = NULL;
for (i = 0; i < die->num_attrs; ++i)
{
if (die->attrs[i].name == name)
return &die->attrs[i];
if (die->attrs[i].name == DW_AT_specification
|| die->attrs[i].name == DW_AT_abstract_origin)
spec = &die->attrs[i];
}
if (!spec)
break;
die = follow_die_ref (die, spec, &cu);
}
return NULL;
}
/* Return the string associated with a string-typed attribute, or NULL if it
is either not found or is of an incorrect type. */
static const char *
dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
{
struct attribute *attr;
const char *str = NULL;
attr = dwarf2_attr (die, name, cu);
if (attr != NULL)
{
str = attr->as_string ();
if (str == nullptr)
complaint (_("string type expected for attribute %s for "
"DIE at %s in module %s"),
dwarf_attr_name (name), sect_offset_str (die->sect_off),
objfile_name (cu->per_objfile->objfile));
}
return str;
}
/* Return the dwo name or NULL if not present. If present, it is in either
DW_AT_GNU_dwo_name or DW_AT_dwo_name attribute. */
static const char *
dwarf2_dwo_name (struct die_info *die, struct dwarf2_cu *cu)
{
const char *dwo_name = dwarf2_string_attr (die, DW_AT_GNU_dwo_name, cu);
if (dwo_name == nullptr)
dwo_name = dwarf2_string_attr (die, DW_AT_dwo_name, cu);
return dwo_name;
}
/* Return non-zero iff the attribute NAME is defined for the given DIE,
and holds a non-zero value. This function should only be used for
DW_FORM_flag or DW_FORM_flag_present attributes. */
static int
dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
{
struct attribute *attr = dwarf2_attr (die, name, cu);
return attr != nullptr && attr->as_boolean ();
}
static int
die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
{
/* A DIE is a declaration if it has a DW_AT_declaration attribute
which value is non-zero. However, we have to be careful with
DIEs having a DW_AT_specification attribute, because dwarf2_attr()
(via dwarf2_flag_true_p) follows this attribute. So we may
end up accidently finding a declaration attribute that belongs
to a different DIE referenced by the specification attribute,
even though the given DIE does not have a declaration attribute. */
return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
&& dwarf2_attr (die, DW_AT_specification, cu) == NULL);
}
/* Return the die giving the specification for DIE, if there is
one. *SPEC_CU is the CU containing DIE on input, and the CU
containing the return value on output. If there is no
specification, but there is an abstract origin, that is
returned. */
static struct die_info *
die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
{
struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
*spec_cu);
if (spec_attr == NULL)
spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
if (spec_attr == NULL)
return NULL;
else
return follow_die_ref (die, spec_attr, spec_cu);
}
/* A convenience function to find the proper .debug_line section for a CU. */
static struct dwarf2_section_info *
get_debug_line_section (struct dwarf2_cu *cu)
{
struct dwarf2_section_info *section;
dwarf2_per_objfile *per_objfile = cu->per_objfile;
/* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
DWO file. */
if (cu->dwo_unit && cu->per_cu->is_debug_types)
section = &cu->dwo_unit->dwo_file->sections.line;
else if (cu->per_cu->is_dwz)
{
dwz_file *dwz = dwarf2_get_dwz_file (per_objfile->per_bfd, true);
section = &dwz->line;
}
else
section = &per_objfile->per_bfd->line;
return section;
}
/* Read the statement program header starting at OFFSET in
.debug_line, or .debug_line.dwo. Return a pointer
to a struct line_header, allocated using xmalloc.
Returns NULL if there is a problem reading the header, e.g., if it
has a version we don't understand.
NOTE: the strings in the include directory and file name tables of
the returned object point into the dwarf line section buffer,
and must not be freed. */
static line_header_up
dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
{
struct dwarf2_section_info *section;
dwarf2_per_objfile *per_objfile = cu->per_objfile;
section = get_debug_line_section (cu);
section->read (per_objfile->objfile);
if (section->buffer == NULL)
{
if (cu->dwo_unit && cu->per_cu->is_debug_types)
complaint (_("missing .debug_line.dwo section"));
else
complaint (_("missing .debug_line section"));
return 0;
}
return dwarf_decode_line_header (sect_off, cu->per_cu->is_dwz,
per_objfile, section, &cu->header);
}
/* Subroutine of dwarf_decode_lines to simplify it.
Return the file name for the given file_entry.
CU_INFO describes the CU's DW_AT_name and DW_AT_comp_dir.
If space for the result is malloc'd, *NAME_HOLDER will be set.
Returns NULL if FILE_INDEX should be ignored, i.e., it is
equivalent to CU_INFO. */
static const char *
compute_include_file_name (const struct line_header *lh, const file_entry &fe,
const file_and_directory &cu_info,
gdb::unique_xmalloc_ptr<char> *name_holder)
{
const char *include_name = fe.name;
const char *include_name_to_compare = include_name;
const char *dir_name = fe.include_dir (lh);
gdb::unique_xmalloc_ptr<char> hold_compare;
if (!IS_ABSOLUTE_PATH (include_name)
&& (dir_name != NULL || cu_info.comp_dir != NULL))
{
/* Avoid creating a duplicate name for CU_INFO.
We do this by comparing INCLUDE_NAME and CU_INFO.
Before we do the comparison, however, we need to account
for DIR_NAME and COMP_DIR.
First prepend dir_name (if non-NULL). If we still don't
have an absolute path prepend comp_dir (if non-NULL).
However, the directory we record in the include-file's
psymtab does not contain COMP_DIR (to match the
corresponding symtab(s)).
Example:
bash$ cd /tmp
bash$ gcc -g ./hello.c
include_name = "hello.c"
dir_name = "."
DW_AT_comp_dir = comp_dir = "/tmp"
DW_AT_name = "./hello.c"
*/
if (dir_name != NULL)
{
name_holder->reset (concat (dir_name, SLASH_STRING,
include_name, (char *) NULL));
include_name = name_holder->get ();
include_name_to_compare = include_name;
}
if (!IS_ABSOLUTE_PATH (include_name) && cu_info.comp_dir != nullptr)
{
hold_compare.reset (concat (cu_info.comp_dir, SLASH_STRING,
include_name, (char *) NULL));
include_name_to_compare = hold_compare.get ();
}
}
gdb::unique_xmalloc_ptr<char> copied_name;
const char *cu_filename = cu_info.name;
if (!IS_ABSOLUTE_PATH (cu_filename) && cu_info.comp_dir != nullptr)
{
copied_name.reset (concat (cu_info.comp_dir, SLASH_STRING,
cu_filename, (char *) NULL));
cu_filename = copied_name.get ();
}
if (FILENAME_CMP (include_name_to_compare, cu_filename) == 0)
return nullptr;
return include_name;
}
/* State machine to track the state of the line number program. */
class lnp_state_machine
{
public:
/* Initialize a machine state for the start of a line number
program. */
lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, line_header *lh,
bool record_lines_p);
file_entry *current_file ()
{
/* lh->file_names is 0-based, but the file name numbers in the
statement program are 1-based. */
return m_line_header->file_name_at (m_file);
}
/* Record the line in the state machine. END_SEQUENCE is true if
we're processing the end of a sequence. */
void record_line (bool end_sequence);
/* Check ADDRESS is -1, or zero and less than UNRELOCATED_LOWPC, and if true
nop-out rest of the lines in this sequence. */
void check_line_address (struct dwarf2_cu *cu,
const gdb_byte *line_ptr,
CORE_ADDR unrelocated_lowpc, CORE_ADDR address);
void handle_set_discriminator (unsigned int discriminator)
{
m_discriminator = discriminator;
m_line_has_non_zero_discriminator |= discriminator != 0;
}
/* Handle DW_LNE_set_address. */
void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
{
m_op_index = 0;
address += baseaddr;
m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
}
/* Handle DW_LNS_advance_pc. */
void handle_advance_pc (CORE_ADDR adjust);
/* Handle a special opcode. */
void handle_special_opcode (unsigned char op_code);
/* Handle DW_LNS_advance_line. */
void handle_advance_line (int line_delta)
{
advance_line (line_delta);
}
/* Handle DW_LNS_set_file. */
void handle_set_file (file_name_index file);
/* Handle DW_LNS_negate_stmt. */
void handle_negate_stmt ()
{
m_is_stmt = !m_is_stmt;
}
/* Handle DW_LNS_const_add_pc. */
void handle_const_add_pc ();
/* Handle DW_LNS_fixed_advance_pc. */
void handle_fixed_advance_pc (CORE_ADDR addr_adj)
{
m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
m_op_index = 0;
}
/* Handle DW_LNS_copy. */
void handle_copy ()
{
record_line (false);
m_discriminator = 0;
}
/* Handle DW_LNE_end_sequence. */
void handle_end_sequence ()
{
m_currently_recording_lines = true;
}
private:
/* Advance the line by LINE_DELTA. */
void advance_line (int line_delta)
{
m_line += line_delta;
if (line_delta != 0)
m_line_has_non_zero_discriminator = m_discriminator != 0;
}
struct dwarf2_cu *m_cu;
gdbarch *m_gdbarch;
/* True if we're recording lines.
Otherwise we're building partial symtabs and are just interested in
finding include files mentioned by the line number program. */
bool m_record_lines_p;
/* The line number header. */
line_header *m_line_header;
/* These are part of the standard DWARF line number state machine,
and initialized according to the DWARF spec. */
unsigned char m_op_index = 0;
/* The line table index of the current file. */
file_name_index m_file = 1;
unsigned int m_line = 1;
/* These are initialized in the constructor. */
CORE_ADDR m_address;
bool m_is_stmt;
unsigned int m_discriminator;
/* Additional bits of state we need to track. */
/* The last file that we called dwarf2_start_subfile for.
This is only used for TLLs. */
unsigned int m_last_file = 0;
/* The last file a line number was recorded for. */
struct subfile *m_last_subfile = NULL;
/* The address of the last line entry. */
CORE_ADDR m_last_address;
/* Set to true when a previous line at the same address (using
m_last_address) had m_is_stmt true. This is reset to false when a
line entry at a new address (m_address different to m_last_address) is
processed. */
bool m_stmt_at_address = false;
/* When true, record the lines we decode. */
bool m_currently_recording_lines = false;
/* The last line number that was recorded, used to coalesce
consecutive entries for the same line. This can happen, for
example, when discriminators are present. PR 17276. */
unsigned int m_last_line = 0;
bool m_line_has_non_zero_discriminator = false;
};
void
lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
{
CORE_ADDR addr_adj = (((m_op_index + adjust)
/ m_line_header->maximum_ops_per_instruction)
* m_line_header->minimum_instruction_length);
m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
m_op_index = ((m_op_index + adjust)
% m_line_header->maximum_ops_per_instruction);
}
void
lnp_state_machine::handle_special_opcode (unsigned char op_code)
{
unsigned char adj_opcode = op_code - m_line_header->opcode_base;
unsigned char adj_opcode_d = adj_opcode / m_line_header->line_range;
unsigned char adj_opcode_r = adj_opcode % m_line_header->line_range;
CORE_ADDR addr_adj = (((m_op_index + adj_opcode_d)
/ m_line_header->maximum_ops_per_instruction)
* m_line_header->minimum_instruction_length);
m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
m_op_index = ((m_op_index + adj_opcode_d)
% m_line_header->maximum_ops_per_instruction);
int line_delta = m_line_header->line_base + adj_opcode_r;
advance_line (line_delta);
record_line (false);
m_discriminator = 0;
}
void
lnp_state_machine::handle_set_file (file_name_index file)
{
m_file = file;
const file_entry *fe = current_file ();
if (fe == NULL)
dwarf2_debug_line_missing_file_complaint ();
else if (m_record_lines_p)
{
const char *dir = fe->include_dir (m_line_header);
m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
m_line_has_non_zero_discriminator = m_discriminator != 0;
dwarf2_start_subfile (m_cu, fe->name, dir);
}
}
void
lnp_state_machine::handle_const_add_pc ()
{
CORE_ADDR adjust
= (255 - m_line_header->opcode_base) / m_line_header->line_range;
CORE_ADDR addr_adj
= (((m_op_index + adjust)
/ m_line_header->maximum_ops_per_instruction)
* m_line_header->minimum_instruction_length);
m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
m_op_index = ((m_op_index + adjust)
% m_line_header->maximum_ops_per_instruction);
}
/* Return non-zero if we should add LINE to the line number table.
LINE is the line to add, LAST_LINE is the last line that was added,
LAST_SUBFILE is the subfile for LAST_LINE.
LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
had a non-zero discriminator.
We have to be careful in the presence of discriminators.
E.g., for this line:
for (i = 0; i < 100000; i++);
clang can emit four line number entries for that one line,
each with a different discriminator.
See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
However, we want gdb to coalesce all four entries into one.
Otherwise the user could stepi into the middle of the line and
gdb would get confused about whether the pc really was in the
middle of the line.
Things are further complicated by the fact that two consecutive
line number entries for the same line is a heuristic used by gcc
to denote the end of the prologue. So we can't just discard duplicate
entries, we have to be selective about it. The heuristic we use is
that we only collapse consecutive entries for the same line if at least
one of those entries has a non-zero discriminator. PR 17276.
Note: Addresses in the line number state machine can never go backwards
within one sequence, thus this coalescing is ok. */
static int
dwarf_record_line_p (struct dwarf2_cu *cu,
unsigned int line, unsigned int last_line,
int line_has_non_zero_discriminator,
struct subfile *last_subfile)
{
if (cu->get_builder ()->get_current_subfile () != last_subfile)
return 1;
if (line != last_line)
return 1;
/* Same line for the same file that we've seen already.
As a last check, for pr 17276, only record the line if the line
has never had a non-zero discriminator. */
if (!line_has_non_zero_discriminator)
return 1;
return 0;
}
/* Use the CU's builder to record line number LINE beginning at
address ADDRESS in the line table of subfile SUBFILE. */
static void
dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
unsigned int line, CORE_ADDR address, bool is_stmt,
struct dwarf2_cu *cu)
{
CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
if (dwarf_line_debug)
{
fprintf_unfiltered (gdb_stdlog,
"Recording line %u, file %s, address %s\n",
line, lbasename (subfile->name),
paddress (gdbarch, address));
}
if (cu != nullptr)
cu->get_builder ()->record_line (subfile, line, addr, is_stmt);
}
/* Subroutine of dwarf_decode_lines_1 to simplify it.
Mark the end of a set of line number records.
The arguments are the same as for dwarf_record_line_1.
If SUBFILE is NULL the request is ignored. */
static void
dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
CORE_ADDR address, struct dwarf2_cu *cu)
{
if (subfile == NULL)
return;
if (dwarf_line_debug)
{
fprintf_unfiltered (gdb_stdlog,
"Finishing current line, file %s, address %s\n",
lbasename (subfile->name),
paddress (gdbarch, address));
}
dwarf_record_line_1 (gdbarch, subfile, 0, address, true, cu);
}
void
lnp_state_machine::record_line (bool end_sequence)
{
if (dwarf_line_debug)
{
fprintf_unfiltered (gdb_stdlog,
"Processing actual line %u: file %u,"
" address %s, is_stmt %u, discrim %u%s\n",
m_line, m_file,
paddress (m_gdbarch, m_address),
m_is_stmt, m_discriminator,
(end_sequence ? "\t(end sequence)" : ""));
}
file_entry *fe = current_file ();
if (fe == NULL)
dwarf2_debug_line_missing_file_complaint ();
/* For now we ignore lines not starting on an instruction boundary.
But not when processing end_sequence for compatibility with the
previous version of the code. */
else if (m_op_index == 0 || end_sequence)
{
fe->included_p = true;
if (m_record_lines_p)
{
/* When we switch files we insert an end maker in the first file,
switch to the second file and add a new line entry. The
problem is that the end marker inserted in the first file will
discard any previous line entries at the same address. If the
line entries in the first file are marked as is-stmt, while
the new line in the second file is non-stmt, then this means
the end marker will discard is-stmt lines so we can have a
non-stmt line. This means that there are less addresses at
which the user can insert a breakpoint.
To improve this we track the last address in m_last_address,
and whether we have seen an is-stmt at this address. Then
when switching files, if we have seen a stmt at the current
address, and we are switching to create a non-stmt line, then
discard the new line. */
bool file_changed
= m_last_subfile != m_cu->get_builder ()->get_current_subfile ();
bool ignore_this_line
= ((file_changed && !end_sequence && m_last_address == m_address
&& !m_is_stmt && m_stmt_at_address)
|| (!end_sequence && m_line == 0));
if ((file_changed && !ignore_this_line) || end_sequence)
{
dwarf_finish_line (m_gdbarch, m_last_subfile, m_address,
m_currently_recording_lines ? m_cu : nullptr);
}
if (!end_sequence && !ignore_this_line)
{
bool is_stmt = producer_is_codewarrior (m_cu) || m_is_stmt;
if (dwarf_record_line_p (m_cu, m_line, m_last_line,
m_line_has_non_zero_discriminator,
m_last_subfile))
{
buildsym_compunit *builder = m_cu->get_builder ();
dwarf_record_line_1 (m_gdbarch,
builder->get_current_subfile (),
m_line, m_address, is_stmt,
m_currently_recording_lines ? m_cu : nullptr);
}
m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
m_last_line = m_line;
}
}
}
/* Track whether we have seen any m_is_stmt true at m_address in case we
have multiple line table entries all at m_address. */
if (m_last_address != m_address)
{
m_stmt_at_address = false;
m_last_address = m_address;
}
m_stmt_at_address |= m_is_stmt;
}
lnp_state_machine::lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch,
line_header *lh, bool record_lines_p)
{
m_cu = cu;
m_gdbarch = arch;
m_record_lines_p = record_lines_p;
m_line_header = lh;
m_currently_recording_lines = true;
/* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
was a line entry for it so that the backend has a chance to adjust it
and also record it in case it needs it. This is currently used by MIPS
code, cf. `mips_adjust_dwarf2_line'. */
m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
m_is_stmt = lh->default_is_stmt;
m_discriminator = 0;
m_last_address = m_address;
m_stmt_at_address = false;
}
void
lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
const gdb_byte *line_ptr,
CORE_ADDR unrelocated_lowpc, CORE_ADDR address)
{
/* Linkers resolve a symbolic relocation referencing a GC'd function to 0 or
-1. If ADDRESS is 0, ignoring the opcode will err if the text section is
located at 0x0. In this case, additionally check that if
ADDRESS < UNRELOCATED_LOWPC. */
if ((address == 0 && address < unrelocated_lowpc)
|| address == (CORE_ADDR) -1)
{
/* This line table is for a function which has been
GCd by the linker. Ignore it. PR gdb/12528 */
struct objfile *objfile = cu->per_objfile->objfile;
long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"),
line_offset, objfile_name (objfile));
m_currently_recording_lines = false;
/* Note: m_currently_recording_lines is left as false until we see
DW_LNE_end_sequence. */
}
}
/* Subroutine of dwarf_decode_lines to simplify it.
Process the line number information in LH.
If DECODE_FOR_PST_P is non-zero, all we do is process the line number
program in order to set included_p for every referenced header. */
static void
dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
const int decode_for_pst_p, CORE_ADDR lowpc)
{
const gdb_byte *line_ptr, *extended_end;
const gdb_byte *line_end;
unsigned int bytes_read, extended_len;
unsigned char op_code, extended_op;
CORE_ADDR baseaddr;
struct objfile *objfile = cu->per_objfile->objfile;
bfd *abfd = objfile->obfd;
struct gdbarch *gdbarch = objfile->arch ();
/* True if we're recording line info (as opposed to building partial
symtabs and just interested in finding include files mentioned by
the line number program). */
bool record_lines_p = !decode_for_pst_p;
baseaddr = objfile->text_section_offset ();
line_ptr = lh->statement_program_start;
line_end = lh->statement_program_end;
/* Read the statement sequences until there's nothing left. */
while (line_ptr < line_end)
{
/* The DWARF line number program state machine. Reset the state
machine at the start of each sequence. */
lnp_state_machine state_machine (cu, gdbarch, lh, record_lines_p);
bool end_sequence = false;
if (record_lines_p)
{
/* Start a subfile for the current file of the state
machine. */
const file_entry *fe = state_machine.current_file ();
if (fe != NULL)
dwarf2_start_subfile (cu, fe->name, fe->include_dir (lh));
}
/* Decode the table. */
while (line_ptr < line_end && !end_sequence)
{
op_code = read_1_byte (abfd, line_ptr);
line_ptr += 1;
if (op_code >= lh->opcode_base)
{
/* Special opcode. */
state_machine.handle_special_opcode (op_code);
}
else switch (op_code)
{
case DW_LNS_extended_op:
extended_len = read_unsigned_leb128 (abfd, line_ptr,
&bytes_read);
line_ptr += bytes_read;
extended_end = line_ptr + extended_len;
extended_op = read_1_byte (abfd, line_ptr);
line_ptr += 1;
if (DW_LNE_lo_user <= extended_op
&& extended_op <= DW_LNE_hi_user)
{
/* Vendor extension, ignore. */
line_ptr = extended_end;
break;
}
switch (extended_op)
{
case DW_LNE_end_sequence:
state_machine.handle_end_sequence ();
end_sequence = true;
break;
case DW_LNE_set_address:
{
CORE_ADDR address
= cu->header.read_address (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
state_machine.check_line_address (cu, line_ptr,
lowpc - baseaddr, address);
state_machine.handle_set_address (baseaddr, address);
}
break;
case DW_LNE_define_file:
{
const char *cur_file;
unsigned int mod_time, length;
dir_index dindex;
cur_file = read_direct_string (abfd, line_ptr,
&bytes_read);
line_ptr += bytes_read;
dindex = (dir_index)
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
mod_time =
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
length =
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
lh->add_file_name (cur_file, dindex, mod_time, length);
}
break;
case DW_LNE_set_discriminator:
{
/* The discriminator is not interesting to the
debugger; just ignore it. We still need to
check its value though:
if there are consecutive entries for the same
(non-prologue) line we want to coalesce them.
PR 17276. */
unsigned int discr
= read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
state_machine.handle_set_discriminator (discr);
}
break;
default:
complaint (_("mangled .debug_line section"));
return;
}
/* Make sure that we parsed the extended op correctly. If e.g.
we expected a different address size than the producer used,
we may have read the wrong number of bytes. */
if (line_ptr != extended_end)
{
complaint (_("mangled .debug_line section"));
return;
}
break;
case DW_LNS_copy:
state_machine.handle_copy ();
break;
case DW_LNS_advance_pc:
{
CORE_ADDR adjust
= read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
state_machine.handle_advance_pc (adjust);
}
break;
case DW_LNS_advance_line:
{
int line_delta
= read_signed_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
state_machine.handle_advance_line (line_delta);
}
break;
case DW_LNS_set_file:
{
file_name_index file
= (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
&bytes_read);
line_ptr += bytes_read;
state_machine.handle_set_file (file);
}
break;
case DW_LNS_set_column:
(void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
break;
case DW_LNS_negate_stmt:
state_machine.handle_negate_stmt ();
break;
case DW_LNS_set_basic_block:
break;
/* Add to the address register of the state machine the
address increment value corresponding to special opcode
255. I.e., this value is scaled by the minimum
instruction length since special opcode 255 would have
scaled the increment. */
case DW_LNS_const_add_pc:
state_machine.handle_const_add_pc ();
break;
case DW_LNS_fixed_advance_pc:
{
CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
line_ptr += 2;
state_machine.handle_fixed_advance_pc (addr_adj);
}
break;
default:
{
/* Unknown standard opcode, ignore it. */
int i;
for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
{
(void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
}
}
}
}
if (!end_sequence)
dwarf2_debug_line_missing_end_sequence_complaint ();
/* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
in which case we still finish recording the last line). */
state_machine.record_line (true);
}
}
/* Decode the Line Number Program (LNP) for the given line_header
structure and CU. The actual information extracted and the type
of structures created from the LNP depends on the value of PST.
1. If PST is NULL, then this procedure uses the data from the program
to create all necessary symbol tables, and their linetables.
2. If PST is not NULL, this procedure reads the program to determine
the list of files included by the unit represented by PST, and
builds all the associated partial symbol tables.
FND holds the CU file name and directory, if known.
It is used for relative paths in the line table.
NOTE: It is important that psymtabs have the same file name (via
strcmp) as the corresponding symtab. Since the directory is not
used in the name of the symtab we don't use it in the name of the
psymtabs we create. E.g. expand_line_sal requires this when
finding psymtabs to expand. A good testcase for this is
mb-inline.exp.
LOWPC is the lowest address in CU (or 0 if not known).
Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
for its PC<->lines mapping information. Otherwise only the filename
table is read in. */
static void
dwarf_decode_lines (struct line_header *lh, const file_and_directory &fnd,
struct dwarf2_cu *cu, dwarf2_psymtab *pst,
CORE_ADDR lowpc, int decode_mapping)
{
struct objfile *objfile = cu->per_objfile->objfile;
const int decode_for_pst_p = (pst != NULL);
if (decode_mapping)
dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
if (decode_for_pst_p)
{
/* Now that we're done scanning the Line Header Program, we can
create the psymtab of each included file. */
for (auto &file_entry : lh->file_names ())
if (file_entry.included_p)
{
gdb::unique_xmalloc_ptr<char> name_holder;
const char *include_name =
compute_include_file_name (lh, file_entry, fnd, &name_holder);
if (include_name != NULL)
dwarf2_create_include_psymtab
(cu->per_objfile->per_bfd, include_name, pst,
cu->per_objfile->per_bfd->partial_symtabs.get (),
objfile->per_bfd);
}
}
else
{
/* Make sure a symtab is created for every file, even files
which contain only variables (i.e. no code with associated
line numbers). */
buildsym_compunit *builder = cu->get_builder ();
struct compunit_symtab *cust = builder->get_compunit_symtab ();
for (auto &fe : lh->file_names ())
{
dwarf2_start_subfile (cu, fe.name, fe.include_dir (lh));
if (builder->get_current_subfile ()->symtab == NULL)
{
builder->get_current_subfile ()->symtab
= allocate_symtab (cust,
builder->get_current_subfile ()->name);
}
fe.symtab = builder->get_current_subfile ()->symtab;
}
}
}
/* Start a subfile for DWARF. FILENAME is the name of the file and
DIRNAME the name of the source directory which contains FILENAME
or NULL if not known.
This routine tries to keep line numbers from identical absolute and
relative file names in a common subfile.
Using the `list' example from the GDB testsuite, which resides in
/srcdir and compiling it with Irix6.2 cc in /compdir using a filename
of /srcdir/list0.c yields the following debugging information for list0.c:
DW_AT_name: /srcdir/list0.c
DW_AT_comp_dir: /compdir
files.files[0].name: list0.h
files.files[0].dir: /srcdir
files.files[1].name: list0.c
files.files[1].dir: /srcdir
The line number information for list0.c has to end up in a single
subfile, so that `break /srcdir/list0.c:1' works as expected.
start_subfile will ensure that this happens provided that we pass the
concatenation of files.files[1].dir and files.files[1].name as the
subfile's name. */
static void
dwarf2_start_subfile (struct dwarf2_cu *cu, const char *filename,
const char *dirname)
{
gdb::unique_xmalloc_ptr<char> copy;
/* In order not to lose the line information directory,
we concatenate it to the filename when it makes sense.
Note that the Dwarf3 standard says (speaking of filenames in line
information): ``The directory index is ignored for file names
that represent full path names''. Thus ignoring dirname in the
`else' branch below isn't an issue. */
if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
{
copy.reset (concat (dirname, SLASH_STRING, filename, (char *) NULL));
filename = copy.get ();
}
cu->get_builder ()->start_subfile (filename);
}
static void
var_decode_location (struct attribute *attr, struct symbol *sym,
struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
struct comp_unit_head *cu_header = &cu->header;
/* NOTE drow/2003-01-30: There used to be a comment and some special
code here to turn a symbol with DW_AT_external and a
SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
with some versions of binutils) where shared libraries could have
relocations against symbols in their debug information - the
minimal symbol would have the right address, but the debug info
would not. It's no longer necessary, because we will explicitly
apply relocations when we read in the debug information now. */
/* A DW_AT_location attribute with no contents indicates that a
variable has been optimized away. */
if (attr->form_is_block () && attr->as_block ()->size == 0)
{
SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
return;
}
/* Handle one degenerate form of location expression specially, to
preserve GDB's previous behavior when section offsets are
specified. If this is just a DW_OP_addr, DW_OP_addrx, or
DW_OP_GNU_addr_index then mark this symbol as LOC_STATIC. */
if (attr->form_is_block ())
{
struct dwarf_block *block = attr->as_block ();
if ((block->data[0] == DW_OP_addr
&& block->size == 1 + cu_header->addr_size)
|| ((block->data[0] == DW_OP_GNU_addr_index
|| block->data[0] == DW_OP_addrx)
&& (block->size
== 1 + leb128_size (&block->data[1]))))
{
unsigned int dummy;
if (block->data[0] == DW_OP_addr)
SET_SYMBOL_VALUE_ADDRESS
(sym, cu->header.read_address (objfile->obfd,
block->data + 1,
&dummy));
else
SET_SYMBOL_VALUE_ADDRESS
(sym, read_addr_index_from_leb128 (cu, block->data + 1,
&dummy));
SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
fixup_symbol_section (sym, objfile);
SET_SYMBOL_VALUE_ADDRESS
(sym,
SYMBOL_VALUE_ADDRESS (sym)
+ objfile->section_offsets[sym->section_index ()]);
return;
}
}
/* NOTE drow/2002-01-30: It might be worthwhile to have a static
expression evaluator, and use LOC_COMPUTED only when necessary
(i.e. when the value of a register or memory location is
referenced, or a thread-local block, etc.). Then again, it might
not be worthwhile. I'm assuming that it isn't unless performance
or memory numbers show me otherwise. */
dwarf2_symbol_mark_computed (attr, sym, cu, 0);
if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
cu->has_loclist = true;
}
/* Given a pointer to a DWARF information entry, figure out if we need
to make a symbol table entry for it, and if so, create a new entry
and return a pointer to it.
If TYPE is NULL, determine symbol type from the die, otherwise
used the passed type.
If SPACE is not NULL, use it to hold the new symbol. If it is
NULL, allocate a new symbol on the objfile's obstack. */
static struct symbol *
new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
struct symbol *space)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct gdbarch *gdbarch = objfile->arch ();
struct symbol *sym = NULL;
const char *name;
struct attribute *attr = NULL;
struct attribute *attr2 = NULL;
CORE_ADDR baseaddr;
struct pending **list_to_add = NULL;
int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
baseaddr = objfile->text_section_offset ();
name = dwarf2_name (die, cu);
if (name)
{
int suppress_add = 0;
if (space)
sym = space;
else
sym = new (&objfile->objfile_obstack) symbol;
OBJSTAT (objfile, n_syms++);
/* Cache this symbol's name and the name's demangled form (if any). */
sym->set_language (cu->per_cu->lang, &objfile->objfile_obstack);
/* Fortran does not have mangling standard and the mangling does differ
between gfortran, iFort etc. */
const char *physname
= (cu->per_cu->lang == language_fortran
? dwarf2_full_name (name, die, cu)
: dwarf2_physname (name, die, cu));
const char *linkagename = dw2_linkage_name (die, cu);
if (linkagename == nullptr || cu->per_cu->lang == language_ada)
sym->set_linkage_name (physname);
else
{
sym->set_demangled_name (physname, &objfile->objfile_obstack);
sym->set_linkage_name (linkagename);
}
/* Default assumptions.
Use the passed type or decode it from the die. */
SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
if (type != NULL)
SYMBOL_TYPE (sym) = type;
else
SYMBOL_TYPE (sym) = die_type (die, cu);
attr = dwarf2_attr (die,
inlined_func ? DW_AT_call_line : DW_AT_decl_line,
cu);
if (attr != nullptr)
SYMBOL_LINE (sym) = attr->constant_value (0);
attr = dwarf2_attr (die,
inlined_func ? DW_AT_call_file : DW_AT_decl_file,
cu);
if (attr != nullptr && attr->is_nonnegative ())
{
file_name_index file_index
= (file_name_index) attr->as_nonnegative ();
struct file_entry *fe;
if (cu->line_header != NULL)
fe = cu->line_header->file_name_at (file_index);
else
fe = NULL;
if (fe == NULL)
complaint (_("file index out of range"));
else
symbol_set_symtab (sym, fe->symtab);
}
switch (die->tag)
{
case DW_TAG_label:
attr = dwarf2_attr (die, DW_AT_low_pc, cu);
if (attr != nullptr)
{
CORE_ADDR addr;
addr = attr->as_address ();
addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
SET_SYMBOL_VALUE_ADDRESS (sym, addr);
SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
}
else
SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
add_symbol_to_list (sym, cu->list_in_scope);
break;
case DW_TAG_subprogram:
/* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
finish_block. */
SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
attr2 = dwarf2_attr (die, DW_AT_external, cu);
if ((attr2 != nullptr && attr2->as_boolean ())
|| cu->per_cu->lang == language_ada
|| cu->per_cu->lang == language_fortran)
{
/* Subprograms marked external are stored as a global symbol.
Ada and Fortran subprograms, whether marked external or
not, are always stored as a global symbol, because we want
to be able to access them globally. For instance, we want
to be able to break on a nested subprogram without having
to specify the context. */
list_to_add = cu->get_builder ()->get_global_symbols ();
}
else
{
list_to_add = cu->list_in_scope;
}
break;
case DW_TAG_inlined_subroutine:
/* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
finish_block. */
SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
SYMBOL_INLINED (sym) = 1;
list_to_add = cu->list_in_scope;
break;
case DW_TAG_template_value_param:
suppress_add = 1;
/* Fall through. */
case DW_TAG_constant:
case DW_TAG_variable:
case DW_TAG_member:
/* Compilation with minimal debug info may result in
variables with missing type entries. Change the
misleading `void' type to something sensible. */
if (SYMBOL_TYPE (sym)->code () == TYPE_CODE_VOID)
SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
attr = dwarf2_attr (die, DW_AT_const_value, cu);
/* In the case of DW_TAG_member, we should only be called for
static const members. */
if (die->tag == DW_TAG_member)
{
/* dwarf2_add_field uses die_is_declaration,
so we do the same. */
gdb_assert (die_is_declaration (die, cu));
gdb_assert (attr);
}
if (attr != nullptr)
{
dwarf2_const_value (attr, sym, cu);
attr2 = dwarf2_attr (die, DW_AT_external, cu);
if (!suppress_add)
{
if (attr2 != nullptr && attr2->as_boolean ())
list_to_add = cu->get_builder ()->get_global_symbols ();
else
list_to_add = cu->list_in_scope;
}
break;
}
attr = dwarf2_attr (die, DW_AT_location, cu);
if (attr != nullptr)
{
var_decode_location (attr, sym, cu);
attr2 = dwarf2_attr (die, DW_AT_external, cu);
/* Fortran explicitly imports any global symbols to the local
scope by DW_TAG_common_block. */
if (cu->per_cu->lang == language_fortran && die->parent
&& die->parent->tag == DW_TAG_common_block)
attr2 = NULL;
if (SYMBOL_CLASS (sym) == LOC_STATIC
&& SYMBOL_VALUE_ADDRESS (sym) == 0
&& !per_objfile->per_bfd->has_section_at_zero)
{
/* When a static variable is eliminated by the linker,
the corresponding debug information is not stripped
out, but the variable address is set to null;
do not add such variables into symbol table. */
}
else if (attr2 != nullptr && attr2->as_boolean ())
{
if (SYMBOL_CLASS (sym) == LOC_STATIC
&& (objfile->flags & OBJF_MAINLINE) == 0
&& per_objfile->per_bfd->can_copy)
{
/* A global static variable might be subject to
copy relocation. We first check for a local
minsym, though, because maybe the symbol was
marked hidden, in which case this would not
apply. */
bound_minimal_symbol found
= (lookup_minimal_symbol_linkage
(sym->linkage_name (), objfile));
if (found.minsym != nullptr)
sym->maybe_copied = 1;
}
/* A variable with DW_AT_external is never static,
but it may be block-scoped. */
list_to_add
= ((cu->list_in_scope
== cu->get_builder ()->get_file_symbols ())
? cu->get_builder ()->get_global_symbols ()
: cu->list_in_scope);
}
else
list_to_add = cu->list_in_scope;
}
else
{
/* We do not know the address of this symbol.
If it is an external symbol and we have type information
for it, enter the symbol as a LOC_UNRESOLVED symbol.
The address of the variable will then be determined from
the minimal symbol table whenever the variable is
referenced. */
attr2 = dwarf2_attr (die, DW_AT_external, cu);
/* Fortran explicitly imports any global symbols to the local
scope by DW_TAG_common_block. */
if (cu->per_cu->lang == language_fortran && die->parent
&& die->parent->tag == DW_TAG_common_block)
{
/* SYMBOL_CLASS doesn't matter here because
read_common_block is going to reset it. */
if (!suppress_add)
list_to_add = cu->list_in_scope;
}
else if (attr2 != nullptr && attr2->as_boolean ()
&& dwarf2_attr (die, DW_AT_type, cu) != NULL)
{
/* A variable with DW_AT_external is never static, but it
may be block-scoped. */
list_to_add
= ((cu->list_in_scope
== cu->get_builder ()->get_file_symbols ())
? cu->get_builder ()->get_global_symbols ()
: cu->list_in_scope);
SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
}
else if (!die_is_declaration (die, cu))
{
/* Use the default LOC_OPTIMIZED_OUT class. */
gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
if (!suppress_add)
list_to_add = cu->list_in_scope;
}
}
break;
case DW_TAG_formal_parameter:
{
/* If we are inside a function, mark this as an argument. If
not, we might be looking at an argument to an inlined function
when we do not have enough information to show inlined frames;
pretend it's a local variable in that case so that the user can
still see it. */
struct context_stack *curr
= cu->get_builder ()->get_current_context_stack ();
if (curr != nullptr && curr->name != nullptr)
SYMBOL_IS_ARGUMENT (sym) = 1;
attr = dwarf2_attr (die, DW_AT_location, cu);
if (attr != nullptr)
{
var_decode_location (attr, sym, cu);
}
attr = dwarf2_attr (die, DW_AT_const_value, cu);
if (attr != nullptr)
{
dwarf2_const_value (attr, sym, cu);
}
list_to_add = cu->list_in_scope;
}
break;
case DW_TAG_unspecified_parameters:
/* From varargs functions; gdb doesn't seem to have any
interest in this information, so just ignore it for now.
(FIXME?) */
break;
case DW_TAG_template_type_param:
suppress_add = 1;
/* Fall through. */
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_set_type:
case DW_TAG_enumeration_type:
SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
{
/* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
really ever be static objects: otherwise, if you try
to, say, break of a class's method and you're in a file
which doesn't mention that class, it won't work unless
the check for all static symbols in lookup_symbol_aux
saves you. See the OtherFileClass tests in
gdb.c++/namespace.exp. */
if (!suppress_add)
{
buildsym_compunit *builder = cu->get_builder ();
list_to_add
= (cu->list_in_scope == builder->get_file_symbols ()
&& cu->per_cu->lang == language_cplus
? builder->get_global_symbols ()
: cu->list_in_scope);
/* The semantics of C++ state that "struct foo {
... }" also defines a typedef for "foo". */
if (cu->per_cu->lang == language_cplus
|| cu->per_cu->lang == language_ada
|| cu->per_cu->lang == language_d
|| cu->per_cu->lang == language_rust)
{
/* The symbol's name is already allocated along
with this objfile, so we don't need to
duplicate it for the type. */
if (SYMBOL_TYPE (sym)->name () == 0)
SYMBOL_TYPE (sym)->set_name (sym->search_name ());
}
}
}
break;
case DW_TAG_typedef:
SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
list_to_add = cu->list_in_scope;
break;
case DW_TAG_array_type:
case DW_TAG_base_type:
case DW_TAG_subrange_type:
SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
list_to_add = cu->list_in_scope;
break;
case DW_TAG_enumerator:
attr = dwarf2_attr (die, DW_AT_const_value, cu);
if (attr != nullptr)
{
dwarf2_const_value (attr, sym, cu);
}
{
/* NOTE: carlton/2003-11-10: See comment above in the
DW_TAG_class_type, etc. block. */
list_to_add
= (cu->list_in_scope == cu->get_builder ()->get_file_symbols ()
&& cu->per_cu->lang == language_cplus
? cu->get_builder ()->get_global_symbols ()
: cu->list_in_scope);
}
break;
case DW_TAG_imported_declaration:
case DW_TAG_namespace:
SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
list_to_add = cu->get_builder ()->get_global_symbols ();
break;
case DW_TAG_module:
SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
list_to_add = cu->get_builder ()->get_global_symbols ();
break;
case DW_TAG_common_block:
SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
add_symbol_to_list (sym, cu->list_in_scope);
break;
default:
/* Not a tag we recognize. Hopefully we aren't processing
trash data, but since we must specifically ignore things
we don't recognize, there is nothing else we should do at
this point. */
complaint (_("unsupported tag: '%s'"),
dwarf_tag_name (die->tag));
break;
}
if (suppress_add)
{
sym->hash_next = objfile->template_symbols;
objfile->template_symbols = sym;
list_to_add = NULL;
}
if (list_to_add != NULL)
add_symbol_to_list (sym, list_to_add);
/* For the benefit of old versions of GCC, check for anonymous
namespaces based on the demangled name. */
if (!cu->processing_has_namespace_info
&& cu->per_cu->lang == language_cplus)
cp_scan_for_anonymous_namespaces (cu->get_builder (), sym, objfile);
}
return (sym);
}
/* Given an attr with a DW_FORM_dataN value in host byte order,
zero-extend it as appropriate for the symbol's type. The DWARF
standard (v4) is not entirely clear about the meaning of using
DW_FORM_dataN for a constant with a signed type, where the type is
wider than the data. The conclusion of a discussion on the DWARF
list was that this is unspecified. We choose to always zero-extend
because that is the interpretation long in use by GCC. */
static gdb_byte *
dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
struct dwarf2_cu *cu, LONGEST *value, int bits)
{
struct objfile *objfile = cu->per_objfile->objfile;
enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
LONGEST l = attr->constant_value (0);
if (bits < sizeof (*value) * 8)
{
l &= ((LONGEST) 1 << bits) - 1;
*value = l;
}
else if (bits == sizeof (*value) * 8)
*value = l;
else
{
gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
store_unsigned_integer (bytes, bits / 8, byte_order, l);
return bytes;
}
return NULL;
}
/* Read a constant value from an attribute. Either set *VALUE, or if
the value does not fit in *VALUE, set *BYTES - either already
allocated on the objfile obstack, or newly allocated on OBSTACK,
or, set *BATON, if we translated the constant to a location
expression. */
static void
dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
const char *name, struct obstack *obstack,
struct dwarf2_cu *cu,
LONGEST *value, const gdb_byte **bytes,
struct dwarf2_locexpr_baton **baton)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct comp_unit_head *cu_header = &cu->header;
struct dwarf_block *blk;
enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
*value = 0;
*bytes = NULL;
*baton = NULL;
switch (attr->form)
{
case DW_FORM_addr:
case DW_FORM_addrx:
case DW_FORM_GNU_addr_index:
{
gdb_byte *data;
if (TYPE_LENGTH (type) != cu_header->addr_size)
dwarf2_const_value_length_mismatch_complaint (name,
cu_header->addr_size,
TYPE_LENGTH (type));
/* Symbols of this form are reasonably rare, so we just
piggyback on the existing location code rather than writing
a new implementation of symbol_computed_ops. */
*baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
(*baton)->per_objfile = per_objfile;
(*baton)->per_cu = cu->per_cu;
gdb_assert ((*baton)->per_cu);
(*baton)->size = 2 + cu_header->addr_size;
data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
(*baton)->data = data;
data[0] = DW_OP_addr;
store_unsigned_integer (&data[1], cu_header->addr_size,
byte_order, attr->as_address ());
data[cu_header->addr_size + 1] = DW_OP_stack_value;
}
break;
case DW_FORM_string:
case DW_FORM_strp:
case DW_FORM_strx:
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_strp_alt:
/* The string is already allocated on the objfile obstack, point
directly to it. */
*bytes = (const gdb_byte *) attr->as_string ();
break;
case DW_FORM_block1:
case DW_FORM_block2:
case DW_FORM_block4:
case DW_FORM_block:
case DW_FORM_exprloc:
case DW_FORM_data16:
blk = attr->as_block ();
if (TYPE_LENGTH (type) != blk->size)
dwarf2_const_value_length_mismatch_complaint (name, blk->size,
TYPE_LENGTH (type));
*bytes = blk->data;
break;
/* The DW_AT_const_value attributes are supposed to carry the
symbol's value "represented as it would be on the target
architecture." By the time we get here, it's already been
converted to host endianness, so we just need to sign- or
zero-extend it as appropriate. */
case DW_FORM_data1:
*bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
break;
case DW_FORM_data2:
*bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
break;
case DW_FORM_data4:
*bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
break;
case DW_FORM_data8:
*bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
break;
case DW_FORM_sdata:
case DW_FORM_implicit_const:
*value = attr->as_signed ();
break;
case DW_FORM_udata:
*value = attr->as_unsigned ();
break;
default:
complaint (_("unsupported const value attribute form: '%s'"),
dwarf_form_name (attr->form));
*value = 0;
break;
}
}
/* Copy constant value from an attribute to a symbol. */
static void
dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
struct dwarf2_cu *cu)
{
struct objfile *objfile = cu->per_objfile->objfile;
LONGEST value;
const gdb_byte *bytes;
struct dwarf2_locexpr_baton *baton;
dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
sym->print_name (),
&objfile->objfile_obstack, cu,
&value, &bytes, &baton);
if (baton != NULL)
{
SYMBOL_LOCATION_BATON (sym) = baton;
SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
}
else if (bytes != NULL)
{
SYMBOL_VALUE_BYTES (sym) = bytes;
SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
}
else
{
SYMBOL_VALUE (sym) = value;
SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
}
}
/* Return the type of the die in question using its DW_AT_type attribute. */
static struct type *
die_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *type_attr;
type_attr = dwarf2_attr (die, DW_AT_type, cu);
if (!type_attr)
{
struct objfile *objfile = cu->per_objfile->objfile;
/* A missing DW_AT_type represents a void type. */
return objfile_type (objfile)->builtin_void;
}
return lookup_die_type (die, type_attr, cu);
}
/* True iff CU's producer generates GNAT Ada auxiliary information
that allows to find parallel types through that information instead
of having to do expensive parallel lookups by type name. */
static int
need_gnat_info (struct dwarf2_cu *cu)
{
/* Assume that the Ada compiler was GNAT, which always produces
the auxiliary information. */
return (cu->per_cu->lang == language_ada);
}
/* Return the auxiliary type of the die in question using its
DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
attribute is not present. */
static struct type *
die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *type_attr;
type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
if (!type_attr)
return NULL;
return lookup_die_type (die, type_attr, cu);
}
/* If DIE has a descriptive_type attribute, then set the TYPE's
descriptive type accordingly. */
static void
set_descriptive_type (struct type *type, struct die_info *die,
struct dwarf2_cu *cu)
{
struct type *descriptive_type = die_descriptive_type (die, cu);
if (descriptive_type)
{
ALLOCATE_GNAT_AUX_TYPE (type);
TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
}
}
/* Return the containing type of the die in question using its
DW_AT_containing_type attribute. */
static struct type *
die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *type_attr;
struct objfile *objfile = cu->per_objfile->objfile;
type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
if (!type_attr)
error (_("Dwarf Error: Problem turning containing type into gdb type "
"[in module %s]"), objfile_name (objfile));
return lookup_die_type (die, type_attr, cu);
}
/* Return an error marker type to use for the ill formed type in DIE/CU. */
static struct type *
build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
char *saved;
std::string message
= string_printf (_("<unknown type in %s, CU %s, DIE %s>"),
objfile_name (objfile),
sect_offset_str (cu->header.sect_off),
sect_offset_str (die->sect_off));
saved = obstack_strdup (&objfile->objfile_obstack, message);
return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
}
/* Look up the type of DIE in CU using its type attribute ATTR.
ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
DW_AT_containing_type.
If there is no type substitute an error marker. */
static struct type *
lookup_die_type (struct die_info *die, const struct attribute *attr,
struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct type *this_type;
gdb_assert (attr->name == DW_AT_type
|| attr->name == DW_AT_GNAT_descriptive_type
|| attr->name == DW_AT_containing_type);
/* First see if we have it cached. */
if (attr->form == DW_FORM_GNU_ref_alt)
{
struct dwarf2_per_cu_data *per_cu;
sect_offset sect_off = attr->get_ref_die_offset ();
per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, per_objfile);
this_type = get_die_type_at_offset (sect_off, per_cu, per_objfile);
}
else if (attr->form_is_ref ())
{
sect_offset sect_off = attr->get_ref_die_offset ();
this_type = get_die_type_at_offset (sect_off, cu->per_cu, per_objfile);
}
else if (attr->form == DW_FORM_ref_sig8)
{
ULONGEST signature = attr->as_signature ();
return get_signatured_type (die, signature, cu);
}
else
{
complaint (_("Dwarf Error: Bad type attribute %s in DIE"
" at %s [in module %s]"),
dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
objfile_name (objfile));
return build_error_marker_type (cu, die);
}
/* If not cached we need to read it in. */
if (this_type == NULL)
{
struct die_info *type_die = NULL;
struct dwarf2_cu *type_cu = cu;
if (attr->form_is_ref ())
type_die = follow_die_ref (die, attr, &type_cu);
if (type_die == NULL)
return build_error_marker_type (cu, die);
/* If we find the type now, it's probably because the type came
from an inter-CU reference and the type's CU got expanded before
ours. */
this_type = read_type_die (type_die, type_cu);
}
/* If we still don't have a type use an error marker. */
if (this_type == NULL)
return build_error_marker_type (cu, die);
return this_type;
}
/* Return the type in DIE, CU.
Returns NULL for invalid types.
This first does a lookup in die_type_hash,
and only reads the die in if necessary.
NOTE: This can be called when reading in partial or full symbols. */
static struct type *
read_type_die (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *this_type;
this_type = get_die_type (die, cu);
if (this_type)
return this_type;
return read_type_die_1 (die, cu);
}
/* Read the type in DIE, CU.
Returns NULL for invalid types. */
static struct type *
read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
{
struct type *this_type = NULL;
switch (die->tag)
{
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
this_type = read_structure_type (die, cu);
break;
case DW_TAG_enumeration_type:
this_type = read_enumeration_type (die, cu);
break;
case DW_TAG_subprogram:
case DW_TAG_subroutine_type:
case DW_TAG_inlined_subroutine:
this_type = read_subroutine_type (die, cu);
break;
case DW_TAG_array_type:
this_type = read_array_type (die, cu);
break;
case DW_TAG_set_type:
this_type = read_set_type (die, cu);
break;
case DW_TAG_pointer_type:
this_type = read_tag_pointer_type (die, cu);
break;
case DW_TAG_ptr_to_member_type:
this_type = read_tag_ptr_to_member_type (die, cu);
break;
case DW_TAG_reference_type:
this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
break;
case DW_TAG_rvalue_reference_type:
this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
break;
case DW_TAG_const_type:
this_type = read_tag_const_type (die, cu);
break;
case DW_TAG_volatile_type:
this_type = read_tag_volatile_type (die, cu);
break;
case DW_TAG_restrict_type:
this_type = read_tag_restrict_type (die, cu);
break;
case DW_TAG_string_type:
this_type = read_tag_string_type (die, cu);
break;
case DW_TAG_typedef:
this_type = read_typedef (die, cu);
break;
case DW_TAG_subrange_type:
this_type = read_subrange_type (die, cu);
break;
case DW_TAG_base_type:
this_type = read_base_type (die, cu);
break;
case DW_TAG_unspecified_type:
this_type = read_unspecified_type (die, cu);
break;
case DW_TAG_namespace:
this_type = read_namespace_type (die, cu);
break;
case DW_TAG_module:
this_type = read_module_type (die, cu);
break;
case DW_TAG_atomic_type:
this_type = read_tag_atomic_type (die, cu);
break;
default:
complaint (_("unexpected tag in read_type_die: '%s'"),
dwarf_tag_name (die->tag));
break;
}
return this_type;
}
/* See if we can figure out if the class lives in a namespace. We do
this by looking for a member function; its demangled name will
contain namespace info, if there is any.
Return the computed name or NULL.
Space for the result is allocated on the objfile's obstack.
This is the full-die version of guess_partial_die_structure_name.
In this case we know DIE has no useful parent. */
static const char *
guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
{
struct die_info *spec_die;
struct dwarf2_cu *spec_cu;
struct die_info *child;
struct objfile *objfile = cu->per_objfile->objfile;
spec_cu = cu;
spec_die = die_specification (die, &spec_cu);
if (spec_die != NULL)
{
die = spec_die;
cu = spec_cu;
}
for (child = die->child;
child != NULL;
child = child->sibling)
{
if (child->tag == DW_TAG_subprogram)
{
const char *linkage_name = dw2_linkage_name (child, cu);
if (linkage_name != NULL)
{
gdb::unique_xmalloc_ptr<char> actual_name
(cu->language_defn->class_name_from_physname (linkage_name));
const char *name = NULL;
if (actual_name != NULL)
{
const char *die_name = dwarf2_name (die, cu);
if (die_name != NULL
&& strcmp (die_name, actual_name.get ()) != 0)
{
/* Strip off the class name from the full name.
We want the prefix. */
int die_name_len = strlen (die_name);
int actual_name_len = strlen (actual_name.get ());
const char *ptr = actual_name.get ();
/* Test for '::' as a sanity check. */
if (actual_name_len > die_name_len + 2
&& ptr[actual_name_len - die_name_len - 1] == ':')
name = obstack_strndup (
&objfile->per_bfd->storage_obstack,
ptr, actual_name_len - die_name_len - 2);
}
}
return name;
}
}
}
return NULL;
}
/* GCC might emit a nameless typedef that has a linkage name. Determine the
prefix part in such case. See
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
static const char *
anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
const char *base;
if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
&& die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
return NULL;
if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
return NULL;
attr = dw2_linkage_name_attr (die, cu);
const char *attr_name = attr->as_string ();
if (attr == NULL || attr_name == NULL)
return NULL;
/* dwarf2_name had to be already called. */
gdb_assert (attr->canonical_string_p ());
/* Strip the base name, keep any leading namespaces/classes. */
base = strrchr (attr_name, ':');
if (base == NULL || base == attr_name || base[-1] != ':')
return "";
struct objfile *objfile = cu->per_objfile->objfile;
return obstack_strndup (&objfile->per_bfd->storage_obstack,
attr_name,
&base[-1] - attr_name);
}
/* Return the name of the namespace/class that DIE is defined within,
or "" if we can't tell. The caller should not xfree the result.
For example, if we're within the method foo() in the following
code:
namespace N {
class C {
void foo () {
}
};
}
then determine_prefix on foo's die will return "N::C". */
static const char *
determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct die_info *parent, *spec_die;
struct dwarf2_cu *spec_cu;
struct type *parent_type;
const char *retval;
if (cu->per_cu->lang != language_cplus
&& cu->per_cu->lang != language_fortran
&& cu->per_cu->lang != language_d
&& cu->per_cu->lang != language_rust)
return "";
retval = anonymous_struct_prefix (die, cu);
if (retval)
return retval;
/* We have to be careful in the presence of DW_AT_specification.
For example, with GCC 3.4, given the code
namespace N {
void foo() {
// Definition of N::foo.
}
}
then we'll have a tree of DIEs like this:
1: DW_TAG_compile_unit
2: DW_TAG_namespace // N
3: DW_TAG_subprogram // declaration of N::foo
4: DW_TAG_subprogram // definition of N::foo
DW_AT_specification // refers to die #3
Thus, when processing die #4, we have to pretend that we're in
the context of its DW_AT_specification, namely the contex of die
#3. */
spec_cu = cu;
spec_die = die_specification (die, &spec_cu);
if (spec_die == NULL)
parent = die->parent;
else
{
parent = spec_die->parent;
cu = spec_cu;
}
if (parent == NULL)
return "";
else if (parent->building_fullname)
{
const char *name;
const char *parent_name;
/* It has been seen on RealView 2.2 built binaries,
DW_TAG_template_type_param types actually _defined_ as
children of the parent class:
enum E {};
template class <class Enum> Class{};
Class<enum E> class_e;
1: DW_TAG_class_type (Class)
2: DW_TAG_enumeration_type (E)
3: DW_TAG_enumerator (enum1:0)
3: DW_TAG_enumerator (enum2:1)
...
2: DW_TAG_template_type_param
DW_AT_type DW_FORM_ref_udata (E)
Besides being broken debug info, it can put GDB into an
infinite loop. Consider:
When we're building the full name for Class<E>, we'll start
at Class, and go look over its template type parameters,
finding E. We'll then try to build the full name of E, and
reach here. We're now trying to build the full name of E,
and look over the parent DIE for containing scope. In the
broken case, if we followed the parent DIE of E, we'd again
find Class, and once again go look at its template type
arguments, etc., etc. Simply don't consider such parent die
as source-level parent of this die (it can't be, the language
doesn't allow it), and break the loop here. */
name = dwarf2_name (die, cu);
parent_name = dwarf2_name (parent, cu);
complaint (_("template param type '%s' defined within parent '%s'"),
name ? name : "<unknown>",
parent_name ? parent_name : "<unknown>");
return "";
}
else
switch (parent->tag)
{
case DW_TAG_namespace:
parent_type = read_type_die (parent, cu);
/* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
DW_TAG_namespace DIEs with a name of "::" for the global namespace.
Work around this problem here. */
if (cu->per_cu->lang == language_cplus
&& strcmp (parent_type->name (), "::") == 0)
return "";
/* We give a name to even anonymous namespaces. */
return parent_type->name ();
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_module:
parent_type = read_type_die (parent, cu);
if (parent_type->name () != NULL)
return parent_type->name ();
else
/* An anonymous structure is only allowed non-static data
members; no typedefs, no member functions, et cetera.
So it does not need a prefix. */
return "";
case DW_TAG_compile_unit:
case DW_TAG_partial_unit:
/* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
if (cu->per_cu->lang == language_cplus
&& !per_objfile->per_bfd->types.empty ()
&& die->child != NULL
&& (die->tag == DW_TAG_class_type
|| die->tag == DW_TAG_structure_type
|| die->tag == DW_TAG_union_type))
{
const char *name = guess_full_die_structure_name (die, cu);
if (name != NULL)
return name;
}
return "";
case DW_TAG_subprogram:
/* Nested subroutines in Fortran get a prefix with the name
of the parent's subroutine. */
if (cu->per_cu->lang == language_fortran)
{
if ((die->tag == DW_TAG_subprogram)
&& (dwarf2_name (parent, cu) != NULL))
return dwarf2_name (parent, cu);
}
return "";
case DW_TAG_enumeration_type:
parent_type = read_type_die (parent, cu);
if (parent_type->is_declared_class ())
{
if (parent_type->name () != NULL)
return parent_type->name ();
return "";
}
/* Fall through. */
default:
return determine_prefix (parent, cu);
}
}
/* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
an obconcat, otherwise allocate storage for the result. The CU argument is
used to determine the language and hence, the appropriate separator. */
#define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
static char *
typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
int physname, struct dwarf2_cu *cu)
{
const char *lead = "";
const char *sep;
if (suffix == NULL || suffix[0] == '\0'
|| prefix == NULL || prefix[0] == '\0')
sep = "";
else if (cu->per_cu->lang == language_d)
{
/* For D, the 'main' function could be defined in any module, but it
should never be prefixed. */
if (strcmp (suffix, "D main") == 0)
{
prefix = "";
sep = "";
}
else
sep = ".";
}
else if (cu->per_cu->lang == language_fortran && physname)
{
/* This is gfortran specific mangling. Normally DW_AT_linkage_name or
DW_AT_MIPS_linkage_name is preferred and used instead. */
lead = "__";
sep = "_MOD_";
}
else
sep = "::";
if (prefix == NULL)
prefix = "";
if (suffix == NULL)
suffix = "";
if (obs == NULL)
{
char *retval
= ((char *)
xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
strcpy (retval, lead);
strcat (retval, prefix);
strcat (retval, sep);
strcat (retval, suffix);
return retval;
}
else
{
/* We have an obstack. */
return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
}
}
/* Get name of a die, return NULL if not found. */
static const char *
dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
struct objfile *objfile)
{
if (name && cu->per_cu->lang == language_cplus)
{
gdb::unique_xmalloc_ptr<char> canon_name
= cp_canonicalize_string (name);
if (canon_name != nullptr)
name = objfile->intern (canon_name.get ());
}
return name;
}
/* Get name of a die, return NULL if not found.
Anonymous namespaces are converted to their magic string. */
static const char *
dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
{
struct attribute *attr;
struct objfile *objfile = cu->per_objfile->objfile;
attr = dwarf2_attr (die, DW_AT_name, cu);
const char *attr_name = attr == nullptr ? nullptr : attr->as_string ();
if (attr_name == nullptr
&& die->tag != DW_TAG_namespace
&& die->tag != DW_TAG_class_type
&& die->tag != DW_TAG_interface_type
&& die->tag != DW_TAG_structure_type
&& die->tag != DW_TAG_union_type)
return NULL;
switch (die->tag)
{
case DW_TAG_compile_unit:
case DW_TAG_partial_unit:
/* Compilation units have a DW_AT_name that is a filename, not
a source language identifier. */
case DW_TAG_enumeration_type:
case DW_TAG_enumerator:
/* These tags always have simple identifiers already; no need
to canonicalize them. */
return attr_name;
case DW_TAG_namespace:
if (attr_name != nullptr)
return attr_name;
return CP_ANONYMOUS_NAMESPACE_STR;
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
/* Some GCC versions emit spurious DW_AT_name attributes for unnamed
structures or unions. These were of the form "._%d" in GCC 4.1,
or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
and GCC 4.4. We work around this problem by ignoring these. */
if (attr_name != nullptr
&& (startswith (attr_name, "._")
|| startswith (attr_name, "<anonymous")))
return NULL;
/* GCC might emit a nameless typedef that has a linkage name. See
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
if (!attr || attr_name == NULL)
{
attr = dw2_linkage_name_attr (die, cu);
attr_name = attr == nullptr ? nullptr : attr->as_string ();
if (attr == NULL || attr_name == NULL)
return NULL;
/* Avoid demangling attr_name the second time on a second
call for the same DIE. */
if (!attr->canonical_string_p ())
{
gdb::unique_xmalloc_ptr<char> demangled
(gdb_demangle (attr_name, DMGL_TYPES));
if (demangled == nullptr)
return nullptr;
attr->set_string_canonical (objfile->intern (demangled.get ()));
attr_name = attr->as_string ();
}
/* Strip any leading namespaces/classes, keep only the
base name. DW_AT_name for named DIEs does not
contain the prefixes. */
const char *base = strrchr (attr_name, ':');
if (base && base > attr_name && base[-1] == ':')
return &base[1];
else
return attr_name;
}
break;
default:
break;
}
if (!attr->canonical_string_p ())
attr->set_string_canonical (dwarf2_canonicalize_name (attr_name, cu,
objfile));
return attr->as_string ();
}
/* Return the die that this die in an extension of, or NULL if there
is none. *EXT_CU is the CU containing DIE on input, and the CU
containing the return value on output. */
static struct die_info *
dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
{
struct attribute *attr;
attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
if (attr == NULL)
return NULL;
return follow_die_ref (die, attr, ext_cu);
}
static void
dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
{
unsigned int i;
print_spaces (indent, f);
fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
dwarf_tag_name (die->tag), die->abbrev,
sect_offset_str (die->sect_off));
if (die->parent != NULL)
{
print_spaces (indent, f);
fprintf_unfiltered (f, " parent at offset: %s\n",
sect_offset_str (die->parent->sect_off));
}
print_spaces (indent, f);
fprintf_unfiltered (f, " has children: %s\n",
dwarf_bool_name (die->child != NULL));
print_spaces (indent, f);
fprintf_unfiltered (f, " attributes:\n");
for (i = 0; i < die->num_attrs; ++i)
{
print_spaces (indent, f);
fprintf_unfiltered (f, " %s (%s) ",
dwarf_attr_name (die->attrs[i].name),
dwarf_form_name (die->attrs[i].form));
switch (die->attrs[i].form)
{
case DW_FORM_addr:
case DW_FORM_addrx:
case DW_FORM_GNU_addr_index:
fprintf_unfiltered (f, "address: ");
fputs_filtered (hex_string (die->attrs[i].as_address ()), f);
break;
case DW_FORM_block2:
case DW_FORM_block4:
case DW_FORM_block:
case DW_FORM_block1:
fprintf_unfiltered (f, "block: size %s",
pulongest (die->attrs[i].as_block ()->size));
break;
case DW_FORM_exprloc:
fprintf_unfiltered (f, "expression: size %s",
pulongest (die->attrs[i].as_block ()->size));
break;
case DW_FORM_data16:
fprintf_unfiltered (f, "constant of 16 bytes");
break;
case DW_FORM_ref_addr:
fprintf_unfiltered (f, "ref address: ");
fputs_filtered (hex_string (die->attrs[i].as_unsigned ()), f);
break;
case DW_FORM_GNU_ref_alt:
fprintf_unfiltered (f, "alt ref address: ");
fputs_filtered (hex_string (die->attrs[i].as_unsigned ()), f);
break;
case DW_FORM_ref1:
case DW_FORM_ref2:
case DW_FORM_ref4:
case DW_FORM_ref8:
case DW_FORM_ref_udata:
fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
(long) (die->attrs[i].as_unsigned ()));
break;
case DW_FORM_data1:
case DW_FORM_data2:
case DW_FORM_data4:
case DW_FORM_data8:
case DW_FORM_udata:
fprintf_unfiltered (f, "constant: %s",
pulongest (die->attrs[i].as_unsigned ()));
break;
case DW_FORM_sec_offset:
fprintf_unfiltered (f, "section offset: %s",
pulongest (die->attrs[i].as_unsigned ()));
break;
case DW_FORM_ref_sig8:
fprintf_unfiltered (f, "signature: %s",
hex_string (die->attrs[i].as_signature ()));
break;
case DW_FORM_string:
case DW_FORM_strp:
case DW_FORM_line_strp:
case DW_FORM_strx:
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_strp_alt:
fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
die->attrs[i].as_string ()
? die->attrs[i].as_string () : "",
die->attrs[i].canonical_string_p () ? "is" : "not");
break;
case DW_FORM_flag:
if (die->attrs[i].as_boolean ())
fprintf_unfiltered (f, "flag: TRUE");
else
fprintf_unfiltered (f, "flag: FALSE");
break;
case DW_FORM_flag_present:
fprintf_unfiltered (f, "flag: TRUE");
break;
case DW_FORM_indirect:
/* The reader will have reduced the indirect form to
the "base form" so this form should not occur. */
fprintf_unfiltered (f,
"unexpected attribute form: DW_FORM_indirect");
break;
case DW_FORM_sdata:
case DW_FORM_implicit_const:
fprintf_unfiltered (f, "constant: %s",
plongest (die->attrs[i].as_signed ()));
break;
default:
fprintf_unfiltered (f, "unsupported attribute form: %d.",
die->attrs[i].form);
break;
}
fprintf_unfiltered (f, "\n");
}
}
static void
dump_die_for_error (struct die_info *die)
{
dump_die_shallow (gdb_stderr, 0, die);
}
static void
dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
{
int indent = level * 4;
gdb_assert (die != NULL);
if (level >= max_level)
return;
dump_die_shallow (f, indent, die);
if (die->child != NULL)
{
print_spaces (indent, f);
fprintf_unfiltered (f, " Children:");
if (level + 1 < max_level)
{
fprintf_unfiltered (f, "\n");
dump_die_1 (f, level + 1, max_level, die->child);
}
else
{
fprintf_unfiltered (f,
" [not printed, max nesting level reached]\n");
}
}
if (die->sibling != NULL && level > 0)
{
dump_die_1 (f, level, max_level, die->sibling);
}
}
/* This is called from the pdie macro in gdbinit.in.
It's not static so gcc will keep a copy callable from gdb. */
void
dump_die (struct die_info *die, int max_level)
{
dump_die_1 (gdb_stdlog, 0, max_level, die);
}
static void
store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
{
void **slot;
slot = htab_find_slot_with_hash (cu->die_hash, die,
to_underlying (die->sect_off),
INSERT);
*slot = die;
}
/* Follow reference or signature attribute ATTR of SRC_DIE.
On entry *REF_CU is the CU of SRC_DIE.
On exit *REF_CU is the CU of the result. */
static struct die_info *
follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
struct dwarf2_cu **ref_cu)
{
struct die_info *die;
if (attr->form_is_ref ())
die = follow_die_ref (src_die, attr, ref_cu);
else if (attr->form == DW_FORM_ref_sig8)
die = follow_die_sig (src_die, attr, ref_cu);
else
{
dump_die_for_error (src_die);
error (_("Dwarf Error: Expected reference attribute [in module %s]"),
objfile_name ((*ref_cu)->per_objfile->objfile));
}
return die;
}
/* Follow reference OFFSET.
On entry *REF_CU is the CU of the source die referencing OFFSET.
On exit *REF_CU is the CU of the result.
Returns NULL if OFFSET is invalid. */
static struct die_info *
follow_die_offset (sect_offset sect_off, int offset_in_dwz,
struct dwarf2_cu **ref_cu)
{
struct die_info temp_die;
struct dwarf2_cu *target_cu, *cu = *ref_cu;
dwarf2_per_objfile *per_objfile = cu->per_objfile;
gdb_assert (cu->per_cu != NULL);
target_cu = cu;
dwarf_read_debug_printf_v ("source CU offset: %s, target offset: %s, "
"source CU contains target offset: %d",
sect_offset_str (cu->per_cu->sect_off),
sect_offset_str (sect_off),
cu->header.offset_in_cu_p (sect_off));
if (cu->per_cu->is_debug_types)
{
/* .debug_types CUs cannot reference anything outside their CU.
If they need to, they have to reference a signatured type via
DW_FORM_ref_sig8. */
if (!cu->header.offset_in_cu_p (sect_off))
return NULL;
}
else if (offset_in_dwz != cu->per_cu->is_dwz
|| !cu->header.offset_in_cu_p (sect_off))
{
struct dwarf2_per_cu_data *per_cu;
per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
per_objfile);
dwarf_read_debug_printf_v ("target CU offset: %s, "
"target CU DIEs loaded: %d",
sect_offset_str (per_cu->sect_off),
per_objfile->get_cu (per_cu) != nullptr);
/* If necessary, add it to the queue and load its DIEs.
Even if maybe_queue_comp_unit doesn't require us to load the CU's DIEs,
it doesn't mean they are currently loaded. Since we require them
to be loaded, we must check for ourselves. */
if (maybe_queue_comp_unit (cu, per_cu, per_objfile, cu->per_cu->lang)
|| per_objfile->get_cu (per_cu) == nullptr)
load_full_comp_unit (per_cu, per_objfile, per_objfile->get_cu (per_cu),
false, cu->per_cu->lang);
target_cu = per_objfile->get_cu (per_cu);
gdb_assert (target_cu != nullptr);
}
else if (cu->dies == NULL)
{
/* We're loading full DIEs during partial symbol reading. */
gdb_assert (per_objfile->per_bfd->reading_partial_symbols);
load_full_comp_unit (cu->per_cu, per_objfile, cu, false,
language_minimal);
}
*ref_cu = target_cu;
temp_die.sect_off = sect_off;
return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
&temp_die,
to_underlying (sect_off));
}
/* Follow reference attribute ATTR of SRC_DIE.
On entry *REF_CU is the CU of SRC_DIE.
On exit *REF_CU is the CU of the result. */
static struct die_info *
follow_die_ref (struct die_info *src_die, const struct attribute *attr,
struct dwarf2_cu **ref_cu)
{
sect_offset sect_off = attr->get_ref_die_offset ();
struct dwarf2_cu *cu = *ref_cu;
struct die_info *die;
die = follow_die_offset (sect_off,
(attr->form == DW_FORM_GNU_ref_alt
|| cu->per_cu->is_dwz),
ref_cu);
if (!die)
error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
"at %s [in module %s]"),
sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
objfile_name (cu->per_objfile->objfile));
return die;
}
/* See read.h. */
struct dwarf2_locexpr_baton
dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
gdb::function_view<CORE_ADDR ()> get_frame_pc,
bool resolve_abstract_p)
{
struct die_info *die;
struct attribute *attr;
struct dwarf2_locexpr_baton retval;
struct objfile *objfile = per_objfile->objfile;
dwarf2_cu *cu = per_objfile->get_cu (per_cu);
if (cu == nullptr)
cu = load_cu (per_cu, per_objfile, false);
if (cu == nullptr)
{
/* We shouldn't get here for a dummy CU, but don't crash on the user.
Instead just throw an error, not much else we can do. */
error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
sect_offset_str (sect_off), objfile_name (objfile));
}
die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
if (!die)
error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
sect_offset_str (sect_off), objfile_name (objfile));
attr = dwarf2_attr (die, DW_AT_location, cu);
if (!attr && resolve_abstract_p
&& (per_objfile->per_bfd->abstract_to_concrete.find (die->sect_off)
!= per_objfile->per_bfd->abstract_to_concrete.end ()))
{
CORE_ADDR pc = get_frame_pc ();
CORE_ADDR baseaddr = objfile->text_section_offset ();
struct gdbarch *gdbarch = objfile->arch ();
for (const auto &cand_off
: per_objfile->per_bfd->abstract_to_concrete[die->sect_off])
{
struct dwarf2_cu *cand_cu = cu;
struct die_info *cand
= follow_die_offset (cand_off, per_cu->is_dwz, &cand_cu);
if (!cand
|| !cand->parent
|| cand->parent->tag != DW_TAG_subprogram)
continue;
CORE_ADDR pc_low, pc_high;
get_scope_pc_bounds (cand->parent, &pc_low, &pc_high, cu);
if (pc_low == ((CORE_ADDR) -1))
continue;
pc_low = gdbarch_adjust_dwarf2_addr (gdbarch, pc_low + baseaddr);
pc_high = gdbarch_adjust_dwarf2_addr (gdbarch, pc_high + baseaddr);
if (!(pc_low <= pc && pc < pc_high))
continue;
die = cand;
attr = dwarf2_attr (die, DW_AT_location, cu);
break;
}
}
if (!attr)
{
/* DWARF: "If there is no such attribute, then there is no effect.".
DATA is ignored if SIZE is 0. */
retval.data = NULL;
retval.size = 0;
}
else if (attr->form_is_section_offset ())
{
struct dwarf2_loclist_baton loclist_baton;
CORE_ADDR pc = get_frame_pc ();
size_t size;
fill_in_loclist_baton (cu, &loclist_baton, attr);
retval.data = dwarf2_find_location_expression (&loclist_baton,
&size, pc);
retval.size = size;
}
else
{
if (!attr->form_is_block ())
error (_("Dwarf Error: DIE at %s referenced in module %s "
"is neither DW_FORM_block* nor DW_FORM_exprloc"),
sect_offset_str (sect_off), objfile_name (objfile));
struct dwarf_block *block = attr->as_block ();
retval.data = block->data;
retval.size = block->size;
}
retval.per_objfile = per_objfile;
retval.per_cu = cu->per_cu;
per_objfile->age_comp_units ();
return retval;
}
/* See read.h. */
struct dwarf2_locexpr_baton
dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
gdb::function_view<CORE_ADDR ()> get_frame_pc)
{
sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, per_objfile,
get_frame_pc);
}
/* Write a constant of a given type as target-ordered bytes into
OBSTACK. */
static const gdb_byte *
write_constant_as_bytes (struct obstack *obstack,
enum bfd_endian byte_order,
struct type *type,
ULONGEST value,
LONGEST *len)
{
gdb_byte *result;
*len = TYPE_LENGTH (type);
result = (gdb_byte *) obstack_alloc (obstack, *len);
store_unsigned_integer (result, *len, byte_order, value);
return result;
}
/* See read.h. */
const gdb_byte *
dwarf2_fetch_constant_bytes (sect_offset sect_off,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
obstack *obstack,
LONGEST *len)
{
struct die_info *die;
struct attribute *attr;
const gdb_byte *result = NULL;
struct type *type;
LONGEST value;
enum bfd_endian byte_order;
struct objfile *objfile = per_objfile->objfile;
dwarf2_cu *cu = per_objfile->get_cu (per_cu);
if (cu == nullptr)
cu = load_cu (per_cu, per_objfile, false);
if (cu == nullptr)
{
/* We shouldn't get here for a dummy CU, but don't crash on the user.
Instead just throw an error, not much else we can do. */
error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
sect_offset_str (sect_off), objfile_name (objfile));
}
die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
if (!die)
error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
sect_offset_str (sect_off), objfile_name (objfile));
attr = dwarf2_attr (die, DW_AT_const_value, cu);
if (attr == NULL)
return NULL;
byte_order = (bfd_big_endian (objfile->obfd)
? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
switch (attr->form)
{
case DW_FORM_addr:
case DW_FORM_addrx:
case DW_FORM_GNU_addr_index:
{
gdb_byte *tem;
*len = cu->header.addr_size;
tem = (gdb_byte *) obstack_alloc (obstack, *len);
store_unsigned_integer (tem, *len, byte_order, attr->as_address ());
result = tem;
}
break;
case DW_FORM_string:
case DW_FORM_strp:
case DW_FORM_strx:
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_strp_alt:
/* The string is already allocated on the objfile obstack, point
directly to it. */
{
const char *attr_name = attr->as_string ();
result = (const gdb_byte *) attr_name;
*len = strlen (attr_name);
}
break;
case DW_FORM_block1:
case DW_FORM_block2:
case DW_FORM_block4:
case DW_FORM_block:
case DW_FORM_exprloc:
case DW_FORM_data16:
{
struct dwarf_block *block = attr->as_block ();
result = block->data;
*len = block->size;
}
break;
/* The DW_AT_const_value attributes are supposed to carry the
symbol's value "represented as it would be on the target
architecture." By the time we get here, it's already been
converted to host endianness, so we just need to sign- or
zero-extend it as appropriate. */
case DW_FORM_data1:
type = die_type (die, cu);
result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
if (result == NULL)
result = write_constant_as_bytes (obstack, byte_order,
type, value, len);
break;
case DW_FORM_data2:
type = die_type (die, cu);
result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
if (result == NULL)
result = write_constant_as_bytes (obstack, byte_order,
type, value, len);
break;
case DW_FORM_data4:
type = die_type (die, cu);
result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
if (result == NULL)
result = write_constant_as_bytes (obstack, byte_order,
type, value, len);
break;
case DW_FORM_data8:
type = die_type (die, cu);
result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
if (result == NULL)
result = write_constant_as_bytes (obstack, byte_order,
type, value, len);
break;
case DW_FORM_sdata:
case DW_FORM_implicit_const:
type = die_type (die, cu);
result = write_constant_as_bytes (obstack, byte_order,
type, attr->as_signed (), len);
break;
case DW_FORM_udata:
type = die_type (die, cu);
result = write_constant_as_bytes (obstack, byte_order,
type, attr->as_unsigned (), len);
break;
default:
complaint (_("unsupported const value attribute form: '%s'"),
dwarf_form_name (attr->form));
break;
}
return result;
}
/* See read.h. */
struct type *
dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile,
const char **var_name)
{
struct die_info *die;
dwarf2_cu *cu = per_objfile->get_cu (per_cu);
if (cu == nullptr)
cu = load_cu (per_cu, per_objfile, false);
if (cu == nullptr)
return nullptr;
die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
if (!die)
return NULL;
if (var_name != nullptr)
*var_name = var_decl_name (die, cu);
return die_type (die, cu);
}
/* See read.h. */
struct type *
dwarf2_get_die_type (cu_offset die_offset,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile)
{
sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
return get_die_type_at_offset (die_offset_sect, per_cu, per_objfile);
}
/* Follow type unit SIG_TYPE referenced by SRC_DIE.
On entry *REF_CU is the CU of SRC_DIE.
On exit *REF_CU is the CU of the result.
Returns NULL if the referenced DIE isn't found. */
static struct die_info *
follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
struct dwarf2_cu **ref_cu)
{
struct die_info temp_die;
struct dwarf2_cu *sig_cu;
struct die_info *die;
dwarf2_per_objfile *per_objfile = (*ref_cu)->per_objfile;
/* While it might be nice to assert sig_type->type == NULL here,
we can get here for DW_AT_imported_declaration where we need
the DIE not the type. */
/* If necessary, add it to the queue and load its DIEs.
Even if maybe_queue_comp_unit doesn't require us to load the CU's DIEs,
it doesn't mean they are currently loaded. Since we require them
to be loaded, we must check for ourselves. */
if (maybe_queue_comp_unit (*ref_cu, sig_type, per_objfile,
language_minimal)
|| per_objfile->get_cu (sig_type) == nullptr)
read_signatured_type (sig_type, per_objfile);
sig_cu = per_objfile->get_cu (sig_type);
gdb_assert (sig_cu != NULL);
gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
temp_die.sect_off = sig_type->type_offset_in_section;
die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
to_underlying (temp_die.sect_off));
if (die)
{
/* For .gdb_index version 7 keep track of included TUs.
http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
if (per_objfile->per_bfd->index_table != NULL
&& per_objfile->per_bfd->index_table->version <= 7)
{
(*ref_cu)->per_cu->imported_symtabs_push (sig_cu->per_cu);
}
*ref_cu = sig_cu;
return die;
}
return NULL;
}
/* Follow signatured type referenced by ATTR in SRC_DIE.
On entry *REF_CU is the CU of SRC_DIE.
On exit *REF_CU is the CU of the result.
The result is the DIE of the type.
If the referenced type cannot be found an error is thrown. */
static struct die_info *
follow_die_sig (struct die_info *src_die, const struct attribute *attr,
struct dwarf2_cu **ref_cu)
{
ULONGEST signature = attr->as_signature ();
struct signatured_type *sig_type;
struct die_info *die;
gdb_assert (attr->form == DW_FORM_ref_sig8);
sig_type = lookup_signatured_type (*ref_cu, signature);
/* sig_type will be NULL if the signatured type is missing from
the debug info. */
if (sig_type == NULL)
{
error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
" from DIE at %s [in module %s]"),
hex_string (signature), sect_offset_str (src_die->sect_off),
objfile_name ((*ref_cu)->per_objfile->objfile));
}
die = follow_die_sig_1 (src_die, sig_type, ref_cu);
if (die == NULL)
{
dump_die_for_error (src_die);
error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
" from DIE at %s [in module %s]"),
hex_string (signature), sect_offset_str (src_die->sect_off),
objfile_name ((*ref_cu)->per_objfile->objfile));
}
return die;
}
/* Get the type specified by SIGNATURE referenced in DIE/CU,
reading in and processing the type unit if necessary. */
static struct type *
get_signatured_type (struct die_info *die, ULONGEST signature,
struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct signatured_type *sig_type;
struct dwarf2_cu *type_cu;
struct die_info *type_die;
struct type *type;
sig_type = lookup_signatured_type (cu, signature);
/* sig_type will be NULL if the signatured type is missing from
the debug info. */
if (sig_type == NULL)
{
complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced"
" from DIE at %s [in module %s]"),
hex_string (signature), sect_offset_str (die->sect_off),
objfile_name (per_objfile->objfile));
return build_error_marker_type (cu, die);
}
/* If we already know the type we're done. */
type = per_objfile->get_type_for_signatured_type (sig_type);
if (type != nullptr)
return type;
type_cu = cu;
type_die = follow_die_sig_1 (die, sig_type, &type_cu);
if (type_die != NULL)
{
/* N.B. We need to call get_die_type to ensure only one type for this DIE
is created. This is important, for example, because for c++ classes
we need TYPE_NAME set which is only done by new_symbol. Blech. */
type = read_type_die (type_die, type_cu);
if (type == NULL)
{
complaint (_("Dwarf Error: Cannot build signatured type %s"
" referenced from DIE at %s [in module %s]"),
hex_string (signature), sect_offset_str (die->sect_off),
objfile_name (per_objfile->objfile));
type = build_error_marker_type (cu, die);
}
}
else
{
complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced"
" from DIE at %s [in module %s]"),
hex_string (signature), sect_offset_str (die->sect_off),
objfile_name (per_objfile->objfile));
type = build_error_marker_type (cu, die);
}
per_objfile->set_type_for_signatured_type (sig_type, type);
return type;
}
/* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
reading in and processing the type unit if necessary. */
static struct type *
get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
struct dwarf2_cu *cu) /* ARI: editCase function */
{
/* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
if (attr->form_is_ref ())
{
struct dwarf2_cu *type_cu = cu;
struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
return read_type_die (type_die, type_cu);
}
else if (attr->form == DW_FORM_ref_sig8)
{
return get_signatured_type (die, attr->as_signature (), cu);
}
else
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE"
" at %s [in module %s]"),
dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
objfile_name (per_objfile->objfile));
return build_error_marker_type (cu, die);
}
}
/* Load the DIEs associated with type unit PER_CU into memory. */
static void
load_full_type_unit (dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile)
{
struct signatured_type *sig_type;
/* Caller is responsible for ensuring type_unit_groups don't get here. */
gdb_assert (! per_cu->type_unit_group_p ());
/* We have the per_cu, but we need the signatured_type.
Fortunately this is an easy translation. */
gdb_assert (per_cu->is_debug_types);
sig_type = (struct signatured_type *) per_cu;
gdb_assert (per_objfile->get_cu (per_cu) == nullptr);
read_signatured_type (sig_type, per_objfile);
gdb_assert (per_objfile->get_cu (per_cu) != nullptr);
}
/* Read in a signatured type and build its CU and DIEs.
If the type is a stub for the real type in a DWO file,
read in the real type from the DWO file as well. */
static void
read_signatured_type (signatured_type *sig_type,
dwarf2_per_objfile *per_objfile)
{
gdb_assert (sig_type->is_debug_types);
gdb_assert (per_objfile->get_cu (sig_type) == nullptr);
cutu_reader reader (sig_type, per_objfile, nullptr, nullptr, false);
if (!reader.dummy_p)
{
struct dwarf2_cu *cu = reader.cu;
const gdb_byte *info_ptr = reader.info_ptr;
gdb_assert (cu->die_hash == NULL);
cu->die_hash =
htab_create_alloc_ex (cu->header.length / 12,
die_hash,
die_eq,
NULL,
&cu->comp_unit_obstack,
hashtab_obstack_allocate,
dummy_obstack_deallocate);
if (reader.comp_unit_die->has_children)
reader.comp_unit_die->child
= read_die_and_siblings (&reader, info_ptr, &info_ptr,
reader.comp_unit_die);
cu->dies = reader.comp_unit_die;
/* comp_unit_die is not stored in die_hash, no need. */
/* We try not to read any attributes in this function, because
not all CUs needed for references have been loaded yet, and
symbol table processing isn't initialized. But we have to
set the CU language, or we won't be able to build types
correctly. Similarly, if we do not read the producer, we can
not apply producer-specific interpretation. */
prepare_one_comp_unit (cu, cu->dies, language_minimal);
reader.keep ();
}
sig_type->tu_read = 1;
}
/* Decode simple location descriptions.
Given a pointer to a dwarf block that defines a location, compute
the location and return the value. If COMPUTED is non-null, it is
set to true to indicate that decoding was successful, and false
otherwise. If COMPUTED is null, then this function may emit a
complaint. */
static CORE_ADDR
decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu, bool *computed)
{
struct objfile *objfile = cu->per_objfile->objfile;
size_t i;
size_t size = blk->size;
const gdb_byte *data = blk->data;
CORE_ADDR stack[64];
int stacki;
unsigned int bytes_read, unsnd;
gdb_byte op;
if (computed != nullptr)
*computed = false;
i = 0;
stacki = 0;
stack[stacki] = 0;
stack[++stacki] = 0;
while (i < size)
{
op = data[i++];
switch (op)
{
case DW_OP_lit0:
case DW_OP_lit1:
case DW_OP_lit2:
case DW_OP_lit3:
case DW_OP_lit4:
case DW_OP_lit5:
case DW_OP_lit6:
case DW_OP_lit7:
case DW_OP_lit8:
case DW_OP_lit9:
case DW_OP_lit10:
case DW_OP_lit11:
case DW_OP_lit12:
case DW_OP_lit13:
case DW_OP_lit14:
case DW_OP_lit15:
case DW_OP_lit16:
case DW_OP_lit17:
case DW_OP_lit18:
case DW_OP_lit19:
case DW_OP_lit20:
case DW_OP_lit21:
case DW_OP_lit22:
case DW_OP_lit23:
case DW_OP_lit24:
case DW_OP_lit25:
case DW_OP_lit26:
case DW_OP_lit27:
case DW_OP_lit28:
case DW_OP_lit29:
case DW_OP_lit30:
case DW_OP_lit31:
stack[++stacki] = op - DW_OP_lit0;
break;
case DW_OP_reg0:
case DW_OP_reg1:
case DW_OP_reg2:
case DW_OP_reg3:
case DW_OP_reg4:
case DW_OP_reg5:
case DW_OP_reg6:
case DW_OP_reg7:
case DW_OP_reg8:
case DW_OP_reg9:
case DW_OP_reg10:
case DW_OP_reg11:
case DW_OP_reg12:
case DW_OP_reg13:
case DW_OP_reg14:
case DW_OP_reg15:
case DW_OP_reg16:
case DW_OP_reg17:
case DW_OP_reg18:
case DW_OP_reg19:
case DW_OP_reg20:
case DW_OP_reg21:
case DW_OP_reg22:
case DW_OP_reg23:
case DW_OP_reg24:
case DW_OP_reg25:
case DW_OP_reg26:
case DW_OP_reg27:
case DW_OP_reg28:
case DW_OP_reg29:
case DW_OP_reg30:
case DW_OP_reg31:
stack[++stacki] = op - DW_OP_reg0;
if (i < size)
{
if (computed == nullptr)
dwarf2_complex_location_expr_complaint ();
else
return 0;
}
break;
case DW_OP_regx:
unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
i += bytes_read;
stack[++stacki] = unsnd;
if (i < size)
{
if (computed == nullptr)
dwarf2_complex_location_expr_complaint ();
else
return 0;
}
break;
case DW_OP_addr:
stack[++stacki] = cu->header.read_address (objfile->obfd, &data[i],
&bytes_read);
i += bytes_read;
break;
case DW_OP_const1u:
stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
i += 1;
break;
case DW_OP_const1s:
stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
i += 1;
break;
case DW_OP_const2u:
stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
i += 2;
break;
case DW_OP_const2s:
stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
i += 2;
break;
case DW_OP_const4u:
stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
i += 4;
break;
case DW_OP_const4s:
stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
i += 4;
break;
case DW_OP_const8u:
stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
i += 8;
break;
case DW_OP_constu:
stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
&bytes_read);
i += bytes_read;
break;
case DW_OP_consts:
stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
i += bytes_read;
break;
case DW_OP_dup:
stack[stacki + 1] = stack[stacki];
stacki++;
break;
case DW_OP_plus:
stack[stacki - 1] += stack[stacki];
stacki--;
break;
case DW_OP_plus_uconst:
stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
&bytes_read);
i += bytes_read;
break;
case DW_OP_minus:
stack[stacki - 1] -= stack[stacki];
stacki--;
break;
case DW_OP_deref:
/* If we're not the last op, then we definitely can't encode
this using GDB's address_class enum. This is valid for partial
global symbols, although the variable's address will be bogus
in the psymtab. */
if (i < size)
{
if (computed == nullptr)
dwarf2_complex_location_expr_complaint ();
else
return 0;
}
break;
case DW_OP_GNU_push_tls_address:
case DW_OP_form_tls_address:
/* The top of the stack has the offset from the beginning
of the thread control block at which the variable is located. */
/* Nothing should follow this operator, so the top of stack would
be returned. */
/* This is valid for partial global symbols, but the variable's
address will be bogus in the psymtab. Make it always at least
non-zero to not look as a variable garbage collected by linker
which have DW_OP_addr 0. */
if (i < size)
{
if (computed == nullptr)
dwarf2_complex_location_expr_complaint ();
else
return 0;
}
stack[stacki]++;
break;
case DW_OP_GNU_uninit:
if (computed != nullptr)
return 0;
break;
case DW_OP_addrx:
case DW_OP_GNU_addr_index:
case DW_OP_GNU_const_index:
stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
&bytes_read);
i += bytes_read;
break;
default:
if (computed == nullptr)
{
const char *name = get_DW_OP_name (op);
if (name)
complaint (_("unsupported stack op: '%s'"),
name);
else
complaint (_("unsupported stack op: '%02x'"),
op);
}
return (stack[stacki]);
}
/* Enforce maximum stack depth of SIZE-1 to avoid writing
outside of the allocated space. Also enforce minimum>0. */
if (stacki >= ARRAY_SIZE (stack) - 1)
{
if (computed == nullptr)
complaint (_("location description stack overflow"));
return 0;
}
if (stacki <= 0)
{
if (computed == nullptr)
complaint (_("location description stack underflow"));
return 0;
}
}
if (computed != nullptr)
*computed = true;
return (stack[stacki]);
}
/* memory allocation interface */
static struct dwarf_block *
dwarf_alloc_block (struct dwarf2_cu *cu)
{
return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
}
static struct die_info *
dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
{
struct die_info *die;
size_t size = sizeof (struct die_info);
if (num_attrs > 1)
size += (num_attrs - 1) * sizeof (struct attribute);
die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
memset (die, 0, sizeof (struct die_info));
return (die);
}
/* Macro support. */
/* An overload of dwarf_decode_macros that finds the correct section
and ensures it is read in before calling the other overload. */
static void
dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
int section_is_gnu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
const struct line_header *lh = cu->line_header;
unsigned int offset_size = cu->header.offset_size;
struct dwarf2_section_info *section;
const char *section_name;
if (cu->dwo_unit != nullptr)
{
if (section_is_gnu)
{
section = &cu->dwo_unit->dwo_file->sections.macro;
section_name = ".debug_macro.dwo";
}
else
{
section = &cu->dwo_unit->dwo_file->sections.macinfo;
section_name = ".debug_macinfo.dwo";
}
}
else
{
if (section_is_gnu)
{
section = &per_objfile->per_bfd->macro;
section_name = ".debug_macro";
}
else
{
section = &per_objfile->per_bfd->macinfo;
section_name = ".debug_macinfo";
}
}
section->read (objfile);
if (section->buffer == nullptr)
{
complaint (_("missing %s section"), section_name);
return;
}
buildsym_compunit *builder = cu->get_builder ();
struct dwarf2_section_info *str_offsets_section;
struct dwarf2_section_info *str_section;
gdb::optional<ULONGEST> str_offsets_base;
if (cu->dwo_unit != nullptr)
{
str_offsets_section = &cu->dwo_unit->dwo_file
->sections.str_offsets;
str_section = &cu->dwo_unit->dwo_file->sections.str;
str_offsets_base = cu->header.addr_size;
}
else
{
str_offsets_section = &per_objfile->per_bfd->str_offsets;
str_section = &per_objfile->per_bfd->str;
str_offsets_base = cu->str_offsets_base;
}
dwarf_decode_macros (per_objfile, builder, section, lh,
offset_size, offset, str_section, str_offsets_section,
str_offsets_base, section_is_gnu);
}
/* Return the .debug_loc section to use for CU.
For DWO files use .debug_loc.dwo. */
static struct dwarf2_section_info *
cu_debug_loc_section (struct dwarf2_cu *cu)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
if (cu->dwo_unit)
{
struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
return cu->header.version >= 5 ? &sections->loclists : &sections->loc;
}
return (cu->header.version >= 5 ? &per_objfile->per_bfd->loclists
: &per_objfile->per_bfd->loc);
}
/* Return the .debug_rnglists section to use for CU. */
static struct dwarf2_section_info *
cu_debug_rnglists_section (struct dwarf2_cu *cu, dwarf_tag tag)
{
if (cu->header.version < 5)
error (_(".debug_rnglists section cannot be used in DWARF %d"),
cu->header.version);
struct dwarf2_per_objfile *dwarf2_per_objfile = cu->per_objfile;
/* Make sure we read the .debug_rnglists section from the file that
contains the DW_AT_ranges attribute we are reading. Normally that
would be the .dwo file, if there is one. However for DW_TAG_compile_unit
or DW_TAG_skeleton unit, we always want to read from objfile/linked
program. */
if (cu->dwo_unit != nullptr
&& tag != DW_TAG_compile_unit
&& tag != DW_TAG_skeleton_unit)
{
struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
if (sections->rnglists.size > 0)
return &sections->rnglists;
else
error (_(".debug_rnglists section is missing from .dwo file."));
}
return &dwarf2_per_objfile->per_bfd->rnglists;
}
/* A helper function that fills in a dwarf2_loclist_baton. */
static void
fill_in_loclist_baton (struct dwarf2_cu *cu,
struct dwarf2_loclist_baton *baton,
const struct attribute *attr)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct dwarf2_section_info *section = cu_debug_loc_section (cu);
section->read (per_objfile->objfile);
baton->per_objfile = per_objfile;
baton->per_cu = cu->per_cu;
gdb_assert (baton->per_cu);
/* We don't know how long the location list is, but make sure we
don't run off the edge of the section. */
baton->size = section->size - attr->as_unsigned ();
baton->data = section->buffer + attr->as_unsigned ();
if (cu->base_address.has_value ())
baton->base_address = *cu->base_address;
else
baton->base_address = 0;
baton->from_dwo = cu->dwo_unit != NULL;
}
static void
dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
struct dwarf2_cu *cu, int is_block)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct objfile *objfile = per_objfile->objfile;
struct dwarf2_section_info *section = cu_debug_loc_section (cu);
if (attr->form_is_section_offset ()
/* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
the section. If so, fall through to the complaint in the
other branch. */
&& attr->as_unsigned () < section->get_size (objfile))
{
struct dwarf2_loclist_baton *baton;
baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
fill_in_loclist_baton (cu, baton, attr);
if (!cu->base_address.has_value ())
complaint (_("Location list used without "
"specifying the CU base address."));
SYMBOL_ACLASS_INDEX (sym) = (is_block
? dwarf2_loclist_block_index
: dwarf2_loclist_index);
SYMBOL_LOCATION_BATON (sym) = baton;
}
else
{
struct dwarf2_locexpr_baton *baton;
baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
baton->per_objfile = per_objfile;
baton->per_cu = cu->per_cu;
gdb_assert (baton->per_cu);
if (attr->form_is_block ())
{
/* Note that we're just copying the block's data pointer
here, not the actual data. We're still pointing into the
info_buffer for SYM's objfile; right now we never release
that buffer, but when we do clean up properly this may
need to change. */
struct dwarf_block *block = attr->as_block ();
baton->size = block->size;
baton->data = block->data;
}
else
{
dwarf2_invalid_attrib_class_complaint ("location description",
sym->natural_name ());
baton->size = 0;
}
SYMBOL_ACLASS_INDEX (sym) = (is_block
? dwarf2_locexpr_block_index
: dwarf2_locexpr_index);
SYMBOL_LOCATION_BATON (sym) = baton;
}
}
/* See read.h. */
const comp_unit_head *
dwarf2_per_cu_data::get_header () const
{
if (!m_header_read_in)
{
const gdb_byte *info_ptr
= this->section->buffer + to_underlying (this->sect_off);
memset (&m_header, 0, sizeof (m_header));
read_comp_unit_head (&m_header, info_ptr, this->section,
rcuh_kind::COMPILE);
m_header_read_in = true;
}
return &m_header;
}
/* See read.h. */
int
dwarf2_per_cu_data::addr_size () const
{
return this->get_header ()->addr_size;
}
/* See read.h. */
int
dwarf2_per_cu_data::offset_size () const
{
return this->get_header ()->offset_size;
}
/* See read.h. */
int
dwarf2_per_cu_data::ref_addr_size () const
{
const comp_unit_head *header = this->get_header ();
if (header->version == 2)
return header->addr_size;
else
return header->offset_size;
}
/* A helper function for dwarf2_find_containing_comp_unit that returns
the index of the result, and that searches a vector. It will
return a result even if the offset in question does not actually
occur in any CU. This is separate so that it can be unit
tested. */
static int
dwarf2_find_containing_comp_unit
(sect_offset sect_off,
unsigned int offset_in_dwz,
const std::vector<dwarf2_per_cu_data_up> &all_comp_units)
{
int low, high;
low = 0;
high = all_comp_units.size () - 1;
while (high > low)
{
struct dwarf2_per_cu_data *mid_cu;
int mid = low + (high - low) / 2;
mid_cu = all_comp_units[mid].get ();
if (mid_cu->is_dwz > offset_in_dwz
|| (mid_cu->is_dwz == offset_in_dwz
&& mid_cu->sect_off + mid_cu->length > sect_off))
high = mid;
else
low = mid + 1;
}
gdb_assert (low == high);
return low;
}
/* Locate the .debug_info compilation unit from CU's objfile which contains
the DIE at OFFSET. Raises an error on failure. */
static struct dwarf2_per_cu_data *
dwarf2_find_containing_comp_unit (sect_offset sect_off,
unsigned int offset_in_dwz,
dwarf2_per_objfile *per_objfile)
{
int low = dwarf2_find_containing_comp_unit
(sect_off, offset_in_dwz, per_objfile->per_bfd->all_comp_units);
dwarf2_per_cu_data *this_cu
= per_objfile->per_bfd->all_comp_units[low].get ();
if (this_cu->is_dwz != offset_in_dwz || this_cu->sect_off > sect_off)
{
if (low == 0 || this_cu->is_dwz != offset_in_dwz)
error (_("Dwarf Error: could not find partial DIE containing "
"offset %s [in module %s]"),
sect_offset_str (sect_off),
bfd_get_filename (per_objfile->objfile->obfd));
gdb_assert (per_objfile->per_bfd->all_comp_units[low-1]->sect_off
<= sect_off);
return per_objfile->per_bfd->all_comp_units[low - 1].get ();
}
else
{
if (low == per_objfile->per_bfd->all_comp_units.size () - 1
&& sect_off >= this_cu->sect_off + this_cu->length)
error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
return this_cu;
}
}
#if GDB_SELF_TEST
namespace selftests {
namespace find_containing_comp_unit {
static void
run_test ()
{
dwarf2_per_cu_data_up one (new dwarf2_per_cu_data);
dwarf2_per_cu_data *one_ptr = one.get ();
dwarf2_per_cu_data_up two (new dwarf2_per_cu_data);
dwarf2_per_cu_data *two_ptr = two.get ();
dwarf2_per_cu_data_up three (new dwarf2_per_cu_data);
dwarf2_per_cu_data *three_ptr = three.get ();
dwarf2_per_cu_data_up four (new dwarf2_per_cu_data);
dwarf2_per_cu_data *four_ptr = four.get ();
one->length = 5;
two->sect_off = sect_offset (one->length);
two->length = 7;
three->length = 5;
three->is_dwz = 1;
four->sect_off = sect_offset (three->length);
four->length = 7;
four->is_dwz = 1;
std::vector<dwarf2_per_cu_data_up> units;
units.push_back (std::move (one));
units.push_back (std::move (two));
units.push_back (std::move (three));
units.push_back (std::move (four));
int result;
result = dwarf2_find_containing_comp_unit (sect_offset (0), 0, units);
SELF_CHECK (units[result].get () == one_ptr);
result = dwarf2_find_containing_comp_unit (sect_offset (3), 0, units);
SELF_CHECK (units[result].get () == one_ptr);
result = dwarf2_find_containing_comp_unit (sect_offset (5), 0, units);
SELF_CHECK (units[result].get () == two_ptr);
result = dwarf2_find_containing_comp_unit (sect_offset (0), 1, units);
SELF_CHECK (units[result].get () == three_ptr);
result = dwarf2_find_containing_comp_unit (sect_offset (3), 1, units);
SELF_CHECK (units[result].get () == three_ptr);
result = dwarf2_find_containing_comp_unit (sect_offset (5), 1, units);
SELF_CHECK (units[result].get () == four_ptr);
}
}
}
#endif /* GDB_SELF_TEST */
/* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
static void
prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
enum language pretend_language)
{
struct attribute *attr;
cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
/* Set the language we're debugging. */
attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
if (cu->producer != nullptr
&& strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
{
/* The XLCL doesn't generate DW_LANG_OpenCL because this
attribute is not standardised yet. As a workaround for the
language detection we fall back to the DW_AT_producer
string. */
cu->per_cu->lang = language_opencl;
}
else if (cu->producer != nullptr
&& strstr (cu->producer, "GNU Go ") != NULL)
{
/* Similar hack for Go. */
cu->per_cu->lang = language_go;
}
else if (attr != nullptr)
cu->per_cu->lang = dwarf_lang_to_enum_language (attr->constant_value (0));
else
cu->per_cu->lang = pretend_language;
cu->language_defn = language_def (cu->per_cu->lang);
}
/* See read.h. */
dwarf2_cu *
dwarf2_per_objfile::get_cu (dwarf2_per_cu_data *per_cu)
{
auto it = m_dwarf2_cus.find (per_cu);
if (it == m_dwarf2_cus.end ())
return nullptr;
return it->second;
}
/* See read.h. */
void
dwarf2_per_objfile::set_cu (dwarf2_per_cu_data *per_cu, dwarf2_cu *cu)
{
gdb_assert (this->get_cu (per_cu) == nullptr);
m_dwarf2_cus[per_cu] = cu;
}
/* See read.h. */
void
dwarf2_per_objfile::age_comp_units ()
{
dwarf_read_debug_printf_v ("running");
/* This is not expected to be called in the middle of CU expansion. There is
an invariant that if a CU is in the CUs-to-expand queue, its DIEs are
loaded in memory. Calling age_comp_units while the queue is in use could
make us free the DIEs for a CU that is in the queue and therefore break
that invariant. */
gdb_assert (!this->per_bfd->queue.has_value ());
/* Start by clearing all marks. */
for (auto pair : m_dwarf2_cus)
pair.second->clear_mark ();
/* Traverse all CUs, mark them and their dependencies if used recently
enough. */
for (auto pair : m_dwarf2_cus)
{
dwarf2_cu *cu = pair.second;
cu->last_used++;
if (cu->last_used <= dwarf_max_cache_age)
cu->mark ();
}
/* Delete all CUs still not marked. */
for (auto it = m_dwarf2_cus.begin (); it != m_dwarf2_cus.end ();)
{
dwarf2_cu *cu = it->second;
if (!cu->is_marked ())
{
dwarf_read_debug_printf_v ("deleting old CU %s",
sect_offset_str (cu->per_cu->sect_off));
delete cu;
it = m_dwarf2_cus.erase (it);
}
else
it++;
}
}
/* See read.h. */
void
dwarf2_per_objfile::remove_cu (dwarf2_per_cu_data *per_cu)
{
auto it = m_dwarf2_cus.find (per_cu);
if (it == m_dwarf2_cus.end ())
return;
delete it->second;
m_dwarf2_cus.erase (it);
}
dwarf2_per_objfile::~dwarf2_per_objfile ()
{
remove_all_cus ();
}
/* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
We store these in a hash table separate from the DIEs, and preserve them
when the DIEs are flushed out of cache.
The CU "per_cu" pointer is needed because offset alone is not enough to
uniquely identify the type. A file may have multiple .debug_types sections,
or the type may come from a DWO file. Furthermore, while it's more logical
to use per_cu->section+offset, with Fission the section with the data is in
the DWO file but we don't know that section at the point we need it.
We have to use something in dwarf2_per_cu_data (or the pointer to it)
because we can enter the lookup routine, get_die_type_at_offset, from
outside this file, and thus won't necessarily have PER_CU->cu.
Fortunately, PER_CU is stable for the life of the objfile. */
struct dwarf2_per_cu_offset_and_type
{
const struct dwarf2_per_cu_data *per_cu;
sect_offset sect_off;
struct type *type;
};
/* Hash function for a dwarf2_per_cu_offset_and_type. */
static hashval_t
per_cu_offset_and_type_hash (const void *item)
{
const struct dwarf2_per_cu_offset_and_type *ofs
= (const struct dwarf2_per_cu_offset_and_type *) item;
return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
}
/* Equality function for a dwarf2_per_cu_offset_and_type. */
static int
per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
{
const struct dwarf2_per_cu_offset_and_type *ofs_lhs
= (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
const struct dwarf2_per_cu_offset_and_type *ofs_rhs
= (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
return (ofs_lhs->per_cu == ofs_rhs->per_cu
&& ofs_lhs->sect_off == ofs_rhs->sect_off);
}
/* Set the type associated with DIE to TYPE. Save it in CU's hash
table if necessary. For convenience, return TYPE.
The DIEs reading must have careful ordering to:
* Not cause infinite loops trying to read in DIEs as a prerequisite for
reading current DIE.
* Not trying to dereference contents of still incompletely read in types
while reading in other DIEs.
* Enable referencing still incompletely read in types just by a pointer to
the type without accessing its fields.
Therefore caller should follow these rules:
* Try to fetch any prerequisite types we may need to build this DIE type
before building the type and calling set_die_type.
* After building type call set_die_type for current DIE as soon as
possible before fetching more types to complete the current type.
* Make the type as complete as possible before fetching more types. */
static struct type *
set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
bool skip_data_location)
{
dwarf2_per_objfile *per_objfile = cu->per_objfile;
struct dwarf2_per_cu_offset_and_type **slot, ofs;
struct objfile *objfile = per_objfile->objfile;
struct attribute *attr;
struct dynamic_prop prop;
/* For Ada types, make sure that the gnat-specific data is always
initialized (if not already set). There are a few types where
we should not be doing so, because the type-specific area is
already used to hold some other piece of info (eg: TYPE_CODE_FLT
where the type-specific area is used to store the floatformat).
But this is not a problem, because the gnat-specific information
is actually not needed for these types. */
if (need_gnat_info (cu)
&& type->code () != TYPE_CODE_FUNC
&& type->code () != TYPE_CODE_FLT
&& type->code () != TYPE_CODE_METHODPTR
&& type->code () != TYPE_CODE_MEMBERPTR
&& type->code () != TYPE_CODE_METHOD
&& type->code () != TYPE_CODE_FIXED_POINT
&& !HAVE_GNAT_AUX_INFO (type))
INIT_GNAT_SPECIFIC (type);
/* Read DW_AT_allocated and set in type. */
attr = dwarf2_attr (die, DW_AT_allocated, cu);
if (attr != NULL)
{
struct type *prop_type = cu->addr_sized_int_type (false);
if (attr_to_dynamic_prop (attr, die, cu, &prop, prop_type))
type->add_dyn_prop (DYN_PROP_ALLOCATED, prop);
}
/* Read DW_AT_associated and set in type. */
attr = dwarf2_attr (die, DW_AT_associated, cu);
if (attr != NULL)
{
struct type *prop_type = cu->addr_sized_int_type (false);
if (attr_to_dynamic_prop (attr, die, cu, &prop, prop_type))
type->add_dyn_prop (DYN_PROP_ASSOCIATED, prop);
}
/* Read DW_AT_data_location and set in type. */
if (!skip_data_location)
{
attr = dwarf2_attr (die, DW_AT_data_location, cu);
if (attr_to_dynamic_prop (attr, die, cu, &prop, cu->addr_type ()))
type->add_dyn_prop (DYN_PROP_DATA_LOCATION, prop);
}
if (per_objfile->die_type_hash == NULL)
per_objfile->die_type_hash
= htab_up (htab_create_alloc (127,
per_cu_offset_and_type_hash,
per_cu_offset_and_type_eq,
NULL, xcalloc, xfree));
ofs.per_cu = cu->per_cu;
ofs.sect_off = die->sect_off;
ofs.type = type;
slot = (struct dwarf2_per_cu_offset_and_type **)
htab_find_slot (per_objfile->die_type_hash.get (), &ofs, INSERT);
if (*slot)
complaint (_("A problem internal to GDB: DIE %s has type already set"),
sect_offset_str (die->sect_off));
*slot = XOBNEW (&objfile->objfile_obstack,
struct dwarf2_per_cu_offset_and_type);
**slot = ofs;
return type;
}
/* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
or return NULL if the die does not have a saved type. */
static struct type *
get_die_type_at_offset (sect_offset sect_off,
dwarf2_per_cu_data *per_cu,
dwarf2_per_objfile *per_objfile)
{
struct dwarf2_per_cu_offset_and_type *slot, ofs;
if (per_objfile->die_type_hash == NULL)
return NULL;
ofs.per_cu = per_cu;
ofs.sect_off = sect_off;
slot = ((struct dwarf2_per_cu_offset_and_type *)
htab_find (per_objfile->die_type_hash.get (), &ofs));
if (slot)
return slot->type;
else
return NULL;
}
/* Look up the type for DIE in CU in die_type_hash,
or return NULL if DIE does not have a saved type. */
static struct type *
get_die_type (struct die_info *die, struct dwarf2_cu *cu)
{
return get_die_type_at_offset (die->sect_off, cu->per_cu, cu->per_objfile);
}
/* Trivial hash function for partial_die_info: the hash value of a DIE
is its offset in .debug_info for this objfile. */
static hashval_t
partial_die_hash (const void *item)
{
const struct partial_die_info *part_die
= (const struct partial_die_info *) item;
return to_underlying (part_die->sect_off);
}
/* Trivial comparison function for partial_die_info structures: two DIEs
are equal if they have the same offset. */
static int
partial_die_eq (const void *item_lhs, const void *item_rhs)
{
const struct partial_die_info *part_die_lhs
= (const struct partial_die_info *) item_lhs;
const struct partial_die_info *part_die_rhs
= (const struct partial_die_info *) item_rhs;
return part_die_lhs->sect_off == part_die_rhs->sect_off;
}
struct cmd_list_element *set_dwarf_cmdlist;
struct cmd_list_element *show_dwarf_cmdlist;
static void
show_check_physname (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file,
_("Whether to check \"physname\" is %s.\n"),
value);
}
void _initialize_dwarf2_read ();
void
_initialize_dwarf2_read ()
{
add_basic_prefix_cmd ("dwarf", class_maintenance, _("\
Set DWARF specific variables.\n\
Configure DWARF variables such as the cache size."),
&set_dwarf_cmdlist,
0/*allow-unknown*/, &maintenance_set_cmdlist);
add_show_prefix_cmd ("dwarf", class_maintenance, _("\
Show DWARF specific variables.\n\
Show DWARF variables such as the cache size."),
&show_dwarf_cmdlist,
0/*allow-unknown*/, &maintenance_show_cmdlist);
add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
&dwarf_max_cache_age, _("\
Set the upper bound on the age of cached DWARF compilation units."), _("\
Show the upper bound on the age of cached DWARF compilation units."), _("\
A higher limit means that cached compilation units will be stored\n\
in memory longer, and more total memory will be used. Zero disables\n\
caching, which can slow down startup."),
NULL,
show_dwarf_max_cache_age,
&set_dwarf_cmdlist,
&show_dwarf_cmdlist);
add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
Set debugging of the DWARF reader."), _("\
Show debugging of the DWARF reader."), _("\
When enabled (non-zero), debugging messages are printed during DWARF\n\
reading and symtab expansion. A value of 1 (one) provides basic\n\
information. A value greater than 1 provides more verbose information."),
NULL,
NULL,
&setdebuglist, &showdebuglist);
add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
Set debugging of the DWARF DIE reader."), _("\
Show debugging of the DWARF DIE reader."), _("\
When enabled (non-zero), DIEs are dumped after they are read in.\n\
The value is the maximum depth to print."),
NULL,
NULL,
&setdebuglist, &showdebuglist);
add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
Set debugging of the dwarf line reader."), _("\
Show debugging of the dwarf line reader."), _("\
When enabled (non-zero), line number entries are dumped as they are read in.\n\
A value of 1 (one) provides basic information.\n\
A value greater than 1 provides more verbose information."),
NULL,
NULL,
&setdebuglist, &showdebuglist);
add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
Set cross-checking of \"physname\" code against demangler."), _("\
Show cross-checking of \"physname\" code against demangler."), _("\
When enabled, GDB's internal \"physname\" code is checked against\n\
the demangler."),
NULL, show_check_physname,
&setdebuglist, &showdebuglist);
add_setshow_boolean_cmd ("use-deprecated-index-sections",
no_class, &use_deprecated_index_sections, _("\
Set whether to use deprecated gdb_index sections."), _("\
Show whether to use deprecated gdb_index sections."), _("\
When enabled, deprecated .gdb_index sections are used anyway.\n\
Normally they are ignored either because of a missing feature or\n\
performance issue.\n\
Warning: This option must be enabled before gdb reads the file."),
NULL,
NULL,
&setlist, &showlist);
dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
&dwarf2_locexpr_funcs);
dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
&dwarf2_loclist_funcs);
dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
&dwarf2_block_frame_base_locexpr_funcs);
dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
&dwarf2_block_frame_base_loclist_funcs);
#if GDB_SELF_TEST
selftests::register_test ("dw2_expand_symtabs_matching",
selftests::dw2_expand_symtabs_matching::run_test);
selftests::register_test ("dwarf2_find_containing_comp_unit",
selftests::find_containing_comp_unit::run_test);
#endif
}