blob: 80475c6aea1b12bc885c1d2822f1d8f2f9755b69 [file] [log] [blame]
/* Output Dwarf format symbol table information from the GNU C compiler.
Copyright (C) 1992, 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
Contributed by Ron Guilmette (rfg@monkeys.com) of Network Computing Devices.
This file is part of GNU CC.
GNU CC 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 2, or (at your option)
any later version.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "config.h"
#ifdef DWARF_DEBUGGING_INFO
#include "system.h"
#include "dwarf.h"
#include "tree.h"
#include "flags.h"
#include "rtl.h"
#include "hard-reg-set.h"
#include "insn-config.h"
#include "reload.h"
#include "output.h"
#include "defaults.h"
#include "dwarfout.h"
#include "toplev.h"
#if defined(DWARF_TIMESTAMPS)
#if !defined(POSIX)
extern time_t time PROTO ((time_t *)); /* FIXME: use NEED_DECLARATION_TIME */
#endif /* !defined(POSIX) */
#endif /* defined(DWARF_TIMESTAMPS) */
/* We cannot use <assert.h> in GCC source, since that would include
GCC's assert.h, which may not be compatible with the host compiler. */
#undef assert
#ifdef NDEBUG
# define assert(e)
#else
# define assert(e) do { if (! (e)) abort (); } while (0)
#endif
extern char *getpwd PROTO((void));
/* IMPORTANT NOTE: Please see the file README.DWARF for important details
regarding the GNU implementation of Dwarf. */
/* NOTE: In the comments in this file, many references are made to
so called "Debugging Information Entries". For the sake of brevity,
this term is abbreviated to `DIE' throughout the remainder of this
file. */
/* Note that the implementation of C++ support herein is (as yet) unfinished.
If you want to try to complete it, more power to you. */
#if !defined(__GNUC__) || (NDEBUG != 1)
#define inline
#endif
/* How to start an assembler comment. */
#ifndef ASM_COMMENT_START
#define ASM_COMMENT_START ";#"
#endif
/* How to print out a register name. */
#ifndef PRINT_REG
#define PRINT_REG(RTX, CODE, FILE) \
fprintf ((FILE), "%s", reg_names[REGNO (RTX)])
#endif
/* Define a macro which returns non-zero for any tagged type which is
used (directly or indirectly) in the specification of either some
function's return type or some formal parameter of some function.
We use this macro when we are operating in "terse" mode to help us
know what tagged types have to be represented in Dwarf (even in
terse mode) and which ones don't.
A flag bit with this meaning really should be a part of the normal
GCC ..._TYPE nodes, but at the moment, there is no such bit defined
for these nodes. For now, we have to just fake it. It it safe for
us to simply return zero for all complete tagged types (which will
get forced out anyway if they were used in the specification of some
formal or return type) and non-zero for all incomplete tagged types.
*/
#define TYPE_USED_FOR_FUNCTION(tagged_type) (TYPE_SIZE (tagged_type) == 0)
/* Define a macro which returns non-zero for a TYPE_DECL which was
implicitly generated for a tagged type.
Note that unlike the gcc front end (which generates a NULL named
TYPE_DECL node for each complete tagged type, each array type, and
each function type node created) the g++ front end generates a
_named_ TYPE_DECL node for each tagged type node created.
These TYPE_DECLs have DECL_ARTIFICIAL set, so we know not to
generate a DW_TAG_typedef DIE for them. */
#define TYPE_DECL_IS_STUB(decl) \
(DECL_NAME (decl) == NULL \
|| (DECL_ARTIFICIAL (decl) \
&& is_tagged_type (TREE_TYPE (decl)) \
&& decl == TYPE_STUB_DECL (TREE_TYPE (decl))))
extern int flag_traditional;
extern char *version_string;
extern char *language_string;
/* Maximum size (in bytes) of an artificially generated label. */
#define MAX_ARTIFICIAL_LABEL_BYTES 30
/* Make sure we know the sizes of the various types dwarf can describe.
These are only defaults. If the sizes are different for your target,
you should override these values by defining the appropriate symbols
in your tm.h file. */
#ifndef CHAR_TYPE_SIZE
#define CHAR_TYPE_SIZE BITS_PER_UNIT
#endif
#ifndef SHORT_TYPE_SIZE
#define SHORT_TYPE_SIZE (BITS_PER_UNIT * 2)
#endif
#ifndef INT_TYPE_SIZE
#define INT_TYPE_SIZE BITS_PER_WORD
#endif
#ifndef LONG_TYPE_SIZE
#define LONG_TYPE_SIZE BITS_PER_WORD
#endif
#ifndef LONG_LONG_TYPE_SIZE
#define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
#endif
#ifndef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
#endif
#ifndef WCHAR_UNSIGNED
#define WCHAR_UNSIGNED 0
#endif
#ifndef FLOAT_TYPE_SIZE
#define FLOAT_TYPE_SIZE BITS_PER_WORD
#endif
#ifndef DOUBLE_TYPE_SIZE
#define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
#endif
#ifndef LONG_DOUBLE_TYPE_SIZE
#define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
#endif
/* Structure to keep track of source filenames. */
struct filename_entry {
unsigned number;
char * name;
};
typedef struct filename_entry filename_entry;
/* Pointer to an array of elements, each one having the structure above. */
static filename_entry *filename_table;
/* Total number of entries in the table (i.e. array) pointed to by
`filename_table'. This is the *total* and includes both used and
unused slots. */
static unsigned ft_entries_allocated;
/* Number of entries in the filename_table which are actually in use. */
static unsigned ft_entries;
/* Size (in elements) of increments by which we may expand the filename
table. Actually, a single hunk of space of this size should be enough
for most typical programs. */
#define FT_ENTRIES_INCREMENT 64
/* Local pointer to the name of the main input file. Initialized in
dwarfout_init. */
static char *primary_filename;
/* Pointer to the most recent filename for which we produced some line info. */
static char *last_filename;
/* For Dwarf output, we must assign lexical-blocks id numbers
in the order in which their beginnings are encountered.
We output Dwarf debugging info that refers to the beginnings
and ends of the ranges of code for each lexical block with
assembler labels ..Bn and ..Bn.e, where n is the block number.
The labels themselves are generated in final.c, which assigns
numbers to the blocks in the same way. */
static unsigned next_block_number = 2;
/* Counter to generate unique names for DIEs. */
static unsigned next_unused_dienum = 1;
/* Number of the DIE which is currently being generated. */
static unsigned current_dienum;
/* Number to use for the special "pubname" label on the next DIE which
represents a function or data object defined in this compilation
unit which has "extern" linkage. */
static int next_pubname_number = 0;
#define NEXT_DIE_NUM pending_sibling_stack[pending_siblings-1]
/* Pointer to a dynamically allocated list of pre-reserved and still
pending sibling DIE numbers. Note that this list will grow as needed. */
static unsigned *pending_sibling_stack;
/* Counter to keep track of the number of pre-reserved and still pending
sibling DIE numbers. */
static unsigned pending_siblings;
/* The currently allocated size of the above list (expressed in number of
list elements). */
static unsigned pending_siblings_allocated;
/* Size (in elements) of increments by which we may expand the pending
sibling stack. Actually, a single hunk of space of this size should
be enough for most typical programs. */
#define PENDING_SIBLINGS_INCREMENT 64
/* Non-zero if we are performing our file-scope finalization pass and if
we should force out Dwarf descriptions of any and all file-scope
tagged types which are still incomplete types. */
static int finalizing = 0;
/* A pointer to the base of a list of pending types which we haven't
generated DIEs for yet, but which we will have to come back to
later on. */
static tree *pending_types_list;
/* Number of elements currently allocated for the pending_types_list. */
static unsigned pending_types_allocated;
/* Number of elements of pending_types_list currently in use. */
static unsigned pending_types;
/* Size (in elements) of increments by which we may expand the pending
types list. Actually, a single hunk of space of this size should
be enough for most typical programs. */
#define PENDING_TYPES_INCREMENT 64
/* Pointer to an artificial RECORD_TYPE which we create in dwarfout_init.
This is used in a hack to help us get the DIEs describing types of
formal parameters to come *after* all of the DIEs describing the formal
parameters themselves. That's necessary in order to be compatible
with what the brain-damaged svr4 SDB debugger requires. */
static tree fake_containing_scope;
/* The number of the current function definition that we are generating
debugging information for. These numbers range from 1 up to the maximum
number of function definitions contained within the current compilation
unit. These numbers are used to create unique labels for various things
contained within various function definitions. */
static unsigned current_funcdef_number = 1;
/* A pointer to the ..._DECL node which we have most recently been working
on. We keep this around just in case something about it looks screwy
and we want to tell the user what the source coordinates for the actual
declaration are. */
static tree dwarf_last_decl;
/* A flag indicating that we are emitting the member declarations of a
class, so member functions and variables should not be entirely emitted.
This is a kludge to avoid passing a second argument to output_*_die. */
static int in_class;
/* Forward declarations for functions defined in this file. */
static char *dwarf_tag_name PROTO((unsigned));
static char *dwarf_attr_name PROTO((unsigned));
static char *dwarf_stack_op_name PROTO((unsigned));
static char *dwarf_typemod_name PROTO((unsigned));
static char *dwarf_fmt_byte_name PROTO((unsigned));
static char *dwarf_fund_type_name PROTO((unsigned));
static tree decl_ultimate_origin PROTO((tree));
static tree block_ultimate_origin PROTO((tree));
static tree decl_class_context PROTO((tree));
#if 0
static void output_unsigned_leb128 PROTO((unsigned long));
static void output_signed_leb128 PROTO((long));
#endif
static inline int is_body_block PROTO((tree));
static int fundamental_type_code PROTO((tree));
static tree root_type_1 PROTO((tree, int));
static tree root_type PROTO((tree));
static void write_modifier_bytes_1 PROTO((tree, int, int, int));
static void write_modifier_bytes PROTO((tree, int, int));
static inline int type_is_fundamental PROTO((tree));
static void equate_decl_number_to_die_number PROTO((tree));
static inline void equate_type_number_to_die_number PROTO((tree));
static void output_reg_number PROTO((rtx));
static void output_mem_loc_descriptor PROTO((rtx));
static void output_loc_descriptor PROTO((rtx));
static void output_bound_representation PROTO((tree, unsigned, int));
static void output_enumeral_list PROTO((tree));
static inline unsigned ceiling PROTO((unsigned, unsigned));
static inline tree field_type PROTO((tree));
static inline unsigned simple_type_align_in_bits PROTO((tree));
static inline unsigned simple_type_size_in_bits PROTO((tree));
static unsigned field_byte_offset PROTO((tree));
static inline void sibling_attribute PROTO((void));
static void location_attribute PROTO((rtx));
static void data_member_location_attribute PROTO((tree));
static void const_value_attribute PROTO((rtx));
static void location_or_const_value_attribute PROTO((tree));
static inline void name_attribute PROTO((char *));
static inline void fund_type_attribute PROTO((unsigned));
static void mod_fund_type_attribute PROTO((tree, int, int));
static inline void user_def_type_attribute PROTO((tree));
static void mod_u_d_type_attribute PROTO((tree, int, int));
#ifdef USE_ORDERING_ATTRIBUTE
static inline void ordering_attribute PROTO((unsigned));
#endif /* defined(USE_ORDERING_ATTRIBUTE) */
static void subscript_data_attribute PROTO((tree));
static void byte_size_attribute PROTO((tree));
static inline void bit_offset_attribute PROTO((tree));
static inline void bit_size_attribute PROTO((tree));
static inline void element_list_attribute PROTO((tree));
static inline void stmt_list_attribute PROTO((char *));
static inline void low_pc_attribute PROTO((char *));
static inline void high_pc_attribute PROTO((char *));
static inline void body_begin_attribute PROTO((char *));
static inline void body_end_attribute PROTO((char *));
static inline void language_attribute PROTO((unsigned));
static inline void member_attribute PROTO((tree));
#if 0
static inline void string_length_attribute PROTO((tree));
#endif
static inline void comp_dir_attribute PROTO((char *));
static inline void sf_names_attribute PROTO((char *));
static inline void src_info_attribute PROTO((char *));
static inline void mac_info_attribute PROTO((char *));
static inline void prototyped_attribute PROTO((tree));
static inline void producer_attribute PROTO((char *));
static inline void inline_attribute PROTO((tree));
static inline void containing_type_attribute PROTO((tree));
static inline void abstract_origin_attribute PROTO((tree));
#ifdef DWARF_DECL_COORDINATES
static inline void src_coords_attribute PROTO((unsigned, unsigned));
#endif /* defined(DWARF_DECL_COORDINATES) */
static inline void pure_or_virtual_attribute PROTO((tree));
static void name_and_src_coords_attributes PROTO((tree));
static void type_attribute PROTO((tree, int, int));
static char *type_tag PROTO((tree));
static inline void dienum_push PROTO((void));
static inline void dienum_pop PROTO((void));
static inline tree member_declared_type PROTO((tree));
static char *function_start_label PROTO((tree));
static void output_array_type_die PROTO((void *));
static void output_set_type_die PROTO((void *));
#if 0
static void output_entry_point_die PROTO((void *));
#endif
static void output_inlined_enumeration_type_die PROTO((void *));
static void output_inlined_structure_type_die PROTO((void *));
static void output_inlined_union_type_die PROTO((void *));
static void output_enumeration_type_die PROTO((void *));
static void output_formal_parameter_die PROTO((void *));
static void output_global_subroutine_die PROTO((void *));
static void output_global_variable_die PROTO((void *));
static void output_label_die PROTO((void *));
static void output_lexical_block_die PROTO((void *));
static void output_inlined_subroutine_die PROTO((void *));
static void output_local_variable_die PROTO((void *));
static void output_member_die PROTO((void *));
#if 0
static void output_pointer_type_die PROTO((void *));
static void output_reference_type_die PROTO((void *));
#endif
static void output_ptr_to_mbr_type_die PROTO((void *));
static void output_compile_unit_die PROTO((void *));
static void output_string_type_die PROTO((void *));
static void output_inheritance_die PROTO((void *));
static void output_structure_type_die PROTO((void *));
static void output_local_subroutine_die PROTO((void *));
static void output_subroutine_type_die PROTO((void *));
static void output_typedef_die PROTO((void *));
static void output_union_type_die PROTO((void *));
static void output_unspecified_parameters_die PROTO((void *));
static void output_padded_null_die PROTO((void *));
static void output_die PROTO((void (*) PROTO((void *)), void *));
static void end_sibling_chain PROTO((void));
static void output_formal_types PROTO((tree));
static void pend_type PROTO((tree));
static int type_ok_for_scope PROTO((tree, tree));
static void output_pending_types_for_scope PROTO((tree));
static void output_type PROTO((tree, tree));
static void output_tagged_type_instantiation PROTO((tree));
static void output_block PROTO((tree, int));
static void output_decls_for_scope PROTO((tree, int));
static void output_decl PROTO((tree, tree));
static void shuffle_filename_entry PROTO((filename_entry *));
static void generate_new_sfname_entry PROTO((void));
static unsigned lookup_filename PROTO((char *));
static void generate_srcinfo_entry PROTO((unsigned, unsigned));
static void generate_macinfo_entry PROTO((char *, char *));
static int is_pseudo_reg PROTO((rtx));
static tree type_main_variant PROTO((tree));
static int is_tagged_type PROTO((tree));
static int is_redundant_typedef PROTO((tree));
/* Definitions of defaults for assembler-dependent names of various
pseudo-ops and section names.
Theses may be overridden in your tm.h file (if necessary) for your
particular assembler. The default values provided here correspond to
what is expected by "standard" AT&T System V.4 assemblers. */
#ifndef FILE_ASM_OP
#define FILE_ASM_OP ".file"
#endif
#ifndef VERSION_ASM_OP
#define VERSION_ASM_OP ".version"
#endif
#ifndef UNALIGNED_SHORT_ASM_OP
#define UNALIGNED_SHORT_ASM_OP ".2byte"
#endif
#ifndef UNALIGNED_INT_ASM_OP
#define UNALIGNED_INT_ASM_OP ".4byte"
#endif
#ifndef ASM_BYTE_OP
#define ASM_BYTE_OP ".byte"
#endif
#ifndef SET_ASM_OP
#define SET_ASM_OP ".set"
#endif
/* Pseudo-ops for pushing the current section onto the section stack (and
simultaneously changing to a new section) and for poping back to the
section we were in immediately before this one. Note that most svr4
assemblers only maintain a one level stack... you can push all the
sections you want, but you can only pop out one level. (The sparc
svr4 assembler is an exception to this general rule.) That's
OK because we only use at most one level of the section stack herein. */
#ifndef PUSHSECTION_ASM_OP
#define PUSHSECTION_ASM_OP ".section"
#endif
#ifndef POPSECTION_ASM_OP
#define POPSECTION_ASM_OP ".previous"
#endif
/* The default format used by the ASM_OUTPUT_PUSH_SECTION macro (see below)
to print the PUSHSECTION_ASM_OP and the section name. The default here
works for almost all svr4 assemblers, except for the sparc, where the
section name must be enclosed in double quotes. (See sparcv4.h.) */
#ifndef PUSHSECTION_FORMAT
#define PUSHSECTION_FORMAT "\t%s\t%s\n"
#endif
#ifndef DEBUG_SECTION
#define DEBUG_SECTION ".debug"
#endif
#ifndef LINE_SECTION
#define LINE_SECTION ".line"
#endif
#ifndef SFNAMES_SECTION
#define SFNAMES_SECTION ".debug_sfnames"
#endif
#ifndef SRCINFO_SECTION
#define SRCINFO_SECTION ".debug_srcinfo"
#endif
#ifndef MACINFO_SECTION
#define MACINFO_SECTION ".debug_macinfo"
#endif
#ifndef PUBNAMES_SECTION
#define PUBNAMES_SECTION ".debug_pubnames"
#endif
#ifndef ARANGES_SECTION
#define ARANGES_SECTION ".debug_aranges"
#endif
#ifndef TEXT_SECTION
#define TEXT_SECTION ".text"
#endif
#ifndef DATA_SECTION
#define DATA_SECTION ".data"
#endif
#ifndef DATA1_SECTION
#define DATA1_SECTION ".data1"
#endif
#ifndef RODATA_SECTION
#define RODATA_SECTION ".rodata"
#endif
#ifndef RODATA1_SECTION
#define RODATA1_SECTION ".rodata1"
#endif
#ifndef BSS_SECTION
#define BSS_SECTION ".bss"
#endif
/* Definitions of defaults for formats and names of various special
(artificial) labels which may be generated within this file (when
the -g options is used and DWARF_DEBUGGING_INFO is in effect.
If necessary, these may be overridden from within your tm.h file,
but typically, you should never need to override these.
These labels have been hacked (temporarily) so that they all begin with
a `.L' sequence so as to appease the stock sparc/svr4 assembler and the
stock m88k/svr4 assembler, both of which need to see .L at the start of
a label in order to prevent that label from going into the linker symbol
table). When I get time, I'll have to fix this the right way so that we
will use ASM_GENERATE_INTERNAL_LABEL and ASM_OUTPUT_INTERNAL_LABEL herein,
but that will require a rather massive set of changes. For the moment,
the following definitions out to produce the right results for all svr4
and svr3 assemblers. -- rfg
*/
#ifndef TEXT_BEGIN_LABEL
#define TEXT_BEGIN_LABEL "*.L_text_b"
#endif
#ifndef TEXT_END_LABEL
#define TEXT_END_LABEL "*.L_text_e"
#endif
#ifndef DATA_BEGIN_LABEL
#define DATA_BEGIN_LABEL "*.L_data_b"
#endif
#ifndef DATA_END_LABEL
#define DATA_END_LABEL "*.L_data_e"
#endif
#ifndef DATA1_BEGIN_LABEL
#define DATA1_BEGIN_LABEL "*.L_data1_b"
#endif
#ifndef DATA1_END_LABEL
#define DATA1_END_LABEL "*.L_data1_e"
#endif
#ifndef RODATA_BEGIN_LABEL
#define RODATA_BEGIN_LABEL "*.L_rodata_b"
#endif
#ifndef RODATA_END_LABEL
#define RODATA_END_LABEL "*.L_rodata_e"
#endif
#ifndef RODATA1_BEGIN_LABEL
#define RODATA1_BEGIN_LABEL "*.L_rodata1_b"
#endif
#ifndef RODATA1_END_LABEL
#define RODATA1_END_LABEL "*.L_rodata1_e"
#endif
#ifndef BSS_BEGIN_LABEL
#define BSS_BEGIN_LABEL "*.L_bss_b"
#endif
#ifndef BSS_END_LABEL
#define BSS_END_LABEL "*.L_bss_e"
#endif
#ifndef LINE_BEGIN_LABEL
#define LINE_BEGIN_LABEL "*.L_line_b"
#endif
#ifndef LINE_LAST_ENTRY_LABEL
#define LINE_LAST_ENTRY_LABEL "*.L_line_last"
#endif
#ifndef LINE_END_LABEL
#define LINE_END_LABEL "*.L_line_e"
#endif
#ifndef DEBUG_BEGIN_LABEL
#define DEBUG_BEGIN_LABEL "*.L_debug_b"
#endif
#ifndef SFNAMES_BEGIN_LABEL
#define SFNAMES_BEGIN_LABEL "*.L_sfnames_b"
#endif
#ifndef SRCINFO_BEGIN_LABEL
#define SRCINFO_BEGIN_LABEL "*.L_srcinfo_b"
#endif
#ifndef MACINFO_BEGIN_LABEL
#define MACINFO_BEGIN_LABEL "*.L_macinfo_b"
#endif
#ifndef DIE_BEGIN_LABEL_FMT
#define DIE_BEGIN_LABEL_FMT "*.L_D%u"
#endif
#ifndef DIE_END_LABEL_FMT
#define DIE_END_LABEL_FMT "*.L_D%u_e"
#endif
#ifndef PUB_DIE_LABEL_FMT
#define PUB_DIE_LABEL_FMT "*.L_P%u"
#endif
#ifndef INSN_LABEL_FMT
#define INSN_LABEL_FMT "*.L_I%u_%u"
#endif
#ifndef BLOCK_BEGIN_LABEL_FMT
#define BLOCK_BEGIN_LABEL_FMT "*.L_B%u"
#endif
#ifndef BLOCK_END_LABEL_FMT
#define BLOCK_END_LABEL_FMT "*.L_B%u_e"
#endif
#ifndef SS_BEGIN_LABEL_FMT
#define SS_BEGIN_LABEL_FMT "*.L_s%u"
#endif
#ifndef SS_END_LABEL_FMT
#define SS_END_LABEL_FMT "*.L_s%u_e"
#endif
#ifndef EE_BEGIN_LABEL_FMT
#define EE_BEGIN_LABEL_FMT "*.L_e%u"
#endif
#ifndef EE_END_LABEL_FMT
#define EE_END_LABEL_FMT "*.L_e%u_e"
#endif
#ifndef MT_BEGIN_LABEL_FMT
#define MT_BEGIN_LABEL_FMT "*.L_t%u"
#endif
#ifndef MT_END_LABEL_FMT
#define MT_END_LABEL_FMT "*.L_t%u_e"
#endif
#ifndef LOC_BEGIN_LABEL_FMT
#define LOC_BEGIN_LABEL_FMT "*.L_l%u"
#endif
#ifndef LOC_END_LABEL_FMT
#define LOC_END_LABEL_FMT "*.L_l%u_e"
#endif
#ifndef BOUND_BEGIN_LABEL_FMT
#define BOUND_BEGIN_LABEL_FMT "*.L_b%u_%u_%c"
#endif
#ifndef BOUND_END_LABEL_FMT
#define BOUND_END_LABEL_FMT "*.L_b%u_%u_%c_e"
#endif
#ifndef DERIV_BEGIN_LABEL_FMT
#define DERIV_BEGIN_LABEL_FMT "*.L_d%u"
#endif
#ifndef DERIV_END_LABEL_FMT
#define DERIV_END_LABEL_FMT "*.L_d%u_e"
#endif
#ifndef SL_BEGIN_LABEL_FMT
#define SL_BEGIN_LABEL_FMT "*.L_sl%u"
#endif
#ifndef SL_END_LABEL_FMT
#define SL_END_LABEL_FMT "*.L_sl%u_e"
#endif
#ifndef BODY_BEGIN_LABEL_FMT
#define BODY_BEGIN_LABEL_FMT "*.L_b%u"
#endif
#ifndef BODY_END_LABEL_FMT
#define BODY_END_LABEL_FMT "*.L_b%u_e"
#endif
#ifndef FUNC_END_LABEL_FMT
#define FUNC_END_LABEL_FMT "*.L_f%u_e"
#endif
#ifndef TYPE_NAME_FMT
#define TYPE_NAME_FMT "*.L_T%u"
#endif
#ifndef DECL_NAME_FMT
#define DECL_NAME_FMT "*.L_E%u"
#endif
#ifndef LINE_CODE_LABEL_FMT
#define LINE_CODE_LABEL_FMT "*.L_LC%u"
#endif
#ifndef SFNAMES_ENTRY_LABEL_FMT
#define SFNAMES_ENTRY_LABEL_FMT "*.L_F%u"
#endif
#ifndef LINE_ENTRY_LABEL_FMT
#define LINE_ENTRY_LABEL_FMT "*.L_LE%u"
#endif
/* Definitions of defaults for various types of primitive assembly language
output operations.
If necessary, these may be overridden from within your tm.h file,
but typically, you shouldn't need to override these. */
#ifndef ASM_OUTPUT_PUSH_SECTION
#define ASM_OUTPUT_PUSH_SECTION(FILE, SECTION) \
fprintf ((FILE), PUSHSECTION_FORMAT, PUSHSECTION_ASM_OP, SECTION)
#endif
#ifndef ASM_OUTPUT_POP_SECTION
#define ASM_OUTPUT_POP_SECTION(FILE) \
fprintf ((FILE), "\t%s\n", POPSECTION_ASM_OP)
#endif
#ifndef ASM_OUTPUT_DWARF_DELTA2
#define ASM_OUTPUT_DWARF_DELTA2(FILE,LABEL1,LABEL2) \
do { fprintf ((FILE), "\t%s\t", UNALIGNED_SHORT_ASM_OP); \
assemble_name (FILE, LABEL1); \
fprintf (FILE, "-"); \
assemble_name (FILE, LABEL2); \
fprintf (FILE, "\n"); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_DELTA4
#define ASM_OUTPUT_DWARF_DELTA4(FILE,LABEL1,LABEL2) \
do { fprintf ((FILE), "\t%s\t", UNALIGNED_INT_ASM_OP); \
assemble_name (FILE, LABEL1); \
fprintf (FILE, "-"); \
assemble_name (FILE, LABEL2); \
fprintf (FILE, "\n"); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_TAG
#define ASM_OUTPUT_DWARF_TAG(FILE,TAG) \
do { \
fprintf ((FILE), "\t%s\t0x%x", \
UNALIGNED_SHORT_ASM_OP, (unsigned) TAG); \
if (flag_debug_asm) \
fprintf ((FILE), "\t%s %s", \
ASM_COMMENT_START, dwarf_tag_name (TAG)); \
fputc ('\n', (FILE)); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_ATTRIBUTE
#define ASM_OUTPUT_DWARF_ATTRIBUTE(FILE,ATTR) \
do { \
fprintf ((FILE), "\t%s\t0x%x", \
UNALIGNED_SHORT_ASM_OP, (unsigned) ATTR); \
if (flag_debug_asm) \
fprintf ((FILE), "\t%s %s", \
ASM_COMMENT_START, dwarf_attr_name (ATTR)); \
fputc ('\n', (FILE)); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_STACK_OP
#define ASM_OUTPUT_DWARF_STACK_OP(FILE,OP) \
do { \
fprintf ((FILE), "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) OP); \
if (flag_debug_asm) \
fprintf ((FILE), "\t%s %s", \
ASM_COMMENT_START, dwarf_stack_op_name (OP)); \
fputc ('\n', (FILE)); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_FUND_TYPE
#define ASM_OUTPUT_DWARF_FUND_TYPE(FILE,FT) \
do { \
fprintf ((FILE), "\t%s\t0x%x", \
UNALIGNED_SHORT_ASM_OP, (unsigned) FT); \
if (flag_debug_asm) \
fprintf ((FILE), "\t%s %s", \
ASM_COMMENT_START, dwarf_fund_type_name (FT)); \
fputc ('\n', (FILE)); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_FMT_BYTE
#define ASM_OUTPUT_DWARF_FMT_BYTE(FILE,FMT) \
do { \
fprintf ((FILE), "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) FMT); \
if (flag_debug_asm) \
fprintf ((FILE), "\t%s %s", \
ASM_COMMENT_START, dwarf_fmt_byte_name (FMT)); \
fputc ('\n', (FILE)); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_TYPE_MODIFIER
#define ASM_OUTPUT_DWARF_TYPE_MODIFIER(FILE,MOD) \
do { \
fprintf ((FILE), "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) MOD); \
if (flag_debug_asm) \
fprintf ((FILE), "\t%s %s", \
ASM_COMMENT_START, dwarf_typemod_name (MOD)); \
fputc ('\n', (FILE)); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_ADDR
#define ASM_OUTPUT_DWARF_ADDR(FILE,LABEL) \
do { fprintf ((FILE), "\t%s\t", UNALIGNED_INT_ASM_OP); \
assemble_name (FILE, LABEL); \
fprintf (FILE, "\n"); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_ADDR_CONST
#define ASM_OUTPUT_DWARF_ADDR_CONST(FILE,RTX) \
do { \
fprintf ((FILE), "\t%s\t", UNALIGNED_INT_ASM_OP); \
output_addr_const ((FILE), (RTX)); \
fputc ('\n', (FILE)); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_REF
#define ASM_OUTPUT_DWARF_REF(FILE,LABEL) \
do { fprintf ((FILE), "\t%s\t", UNALIGNED_INT_ASM_OP); \
assemble_name (FILE, LABEL); \
fprintf (FILE, "\n"); \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_DATA1
#define ASM_OUTPUT_DWARF_DATA1(FILE,VALUE) \
fprintf ((FILE), "\t%s\t0x%x\n", ASM_BYTE_OP, VALUE)
#endif
#ifndef ASM_OUTPUT_DWARF_DATA2
#define ASM_OUTPUT_DWARF_DATA2(FILE,VALUE) \
fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_SHORT_ASM_OP, (unsigned) VALUE)
#endif
#ifndef ASM_OUTPUT_DWARF_DATA4
#define ASM_OUTPUT_DWARF_DATA4(FILE,VALUE) \
fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, (unsigned) VALUE)
#endif
#ifndef ASM_OUTPUT_DWARF_DATA8
#define ASM_OUTPUT_DWARF_DATA8(FILE,HIGH_VALUE,LOW_VALUE) \
do { \
if (WORDS_BIG_ENDIAN) \
{ \
fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, HIGH_VALUE); \
fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, LOW_VALUE);\
} \
else \
{ \
fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, LOW_VALUE);\
fprintf ((FILE), "\t%s\t0x%x\n", UNALIGNED_INT_ASM_OP, HIGH_VALUE); \
} \
} while (0)
#endif
#ifndef ASM_OUTPUT_DWARF_STRING
#define ASM_OUTPUT_DWARF_STRING(FILE,P) \
ASM_OUTPUT_ASCII ((FILE), P, strlen (P)+1)
#endif
/************************ general utility functions **************************/
inline static int
is_pseudo_reg (rtl)
register rtx rtl;
{
return (((GET_CODE (rtl) == REG) && (REGNO (rtl) >= FIRST_PSEUDO_REGISTER))
|| ((GET_CODE (rtl) == SUBREG)
&& (REGNO (XEXP (rtl, 0)) >= FIRST_PSEUDO_REGISTER)));
}
inline static tree
type_main_variant (type)
register tree type;
{
type = TYPE_MAIN_VARIANT (type);
/* There really should be only one main variant among any group of variants
of a given type (and all of the MAIN_VARIANT values for all members of
the group should point to that one type) but sometimes the C front-end
messes this up for array types, so we work around that bug here. */
if (TREE_CODE (type) == ARRAY_TYPE)
{
while (type != TYPE_MAIN_VARIANT (type))
type = TYPE_MAIN_VARIANT (type);
}
return type;
}
/* Return non-zero if the given type node represents a tagged type. */
inline static int
is_tagged_type (type)
register tree type;
{
register enum tree_code code = TREE_CODE (type);
return (code == RECORD_TYPE || code == UNION_TYPE
|| code == QUAL_UNION_TYPE || code == ENUMERAL_TYPE);
}
static char *
dwarf_tag_name (tag)
register unsigned tag;
{
switch (tag)
{
case TAG_padding: return "TAG_padding";
case TAG_array_type: return "TAG_array_type";
case TAG_class_type: return "TAG_class_type";
case TAG_entry_point: return "TAG_entry_point";
case TAG_enumeration_type: return "TAG_enumeration_type";
case TAG_formal_parameter: return "TAG_formal_parameter";
case TAG_global_subroutine: return "TAG_global_subroutine";
case TAG_global_variable: return "TAG_global_variable";
case TAG_label: return "TAG_label";
case TAG_lexical_block: return "TAG_lexical_block";
case TAG_local_variable: return "TAG_local_variable";
case TAG_member: return "TAG_member";
case TAG_pointer_type: return "TAG_pointer_type";
case TAG_reference_type: return "TAG_reference_type";
case TAG_compile_unit: return "TAG_compile_unit";
case TAG_string_type: return "TAG_string_type";
case TAG_structure_type: return "TAG_structure_type";
case TAG_subroutine: return "TAG_subroutine";
case TAG_subroutine_type: return "TAG_subroutine_type";
case TAG_typedef: return "TAG_typedef";
case TAG_union_type: return "TAG_union_type";
case TAG_unspecified_parameters: return "TAG_unspecified_parameters";
case TAG_variant: return "TAG_variant";
case TAG_common_block: return "TAG_common_block";
case TAG_common_inclusion: return "TAG_common_inclusion";
case TAG_inheritance: return "TAG_inheritance";
case TAG_inlined_subroutine: return "TAG_inlined_subroutine";
case TAG_module: return "TAG_module";
case TAG_ptr_to_member_type: return "TAG_ptr_to_member_type";
case TAG_set_type: return "TAG_set_type";
case TAG_subrange_type: return "TAG_subrange_type";
case TAG_with_stmt: return "TAG_with_stmt";
/* GNU extensions. */
case TAG_format_label: return "TAG_format_label";
case TAG_namelist: return "TAG_namelist";
case TAG_function_template: return "TAG_function_template";
case TAG_class_template: return "TAG_class_template";
default: return "TAG_<unknown>";
}
}
static char *
dwarf_attr_name (attr)
register unsigned attr;
{
switch (attr)
{
case AT_sibling: return "AT_sibling";
case AT_location: return "AT_location";
case AT_name: return "AT_name";
case AT_fund_type: return "AT_fund_type";
case AT_mod_fund_type: return "AT_mod_fund_type";
case AT_user_def_type: return "AT_user_def_type";
case AT_mod_u_d_type: return "AT_mod_u_d_type";
case AT_ordering: return "AT_ordering";
case AT_subscr_data: return "AT_subscr_data";
case AT_byte_size: return "AT_byte_size";
case AT_bit_offset: return "AT_bit_offset";
case AT_bit_size: return "AT_bit_size";
case AT_element_list: return "AT_element_list";
case AT_stmt_list: return "AT_stmt_list";
case AT_low_pc: return "AT_low_pc";
case AT_high_pc: return "AT_high_pc";
case AT_language: return "AT_language";
case AT_member: return "AT_member";
case AT_discr: return "AT_discr";
case AT_discr_value: return "AT_discr_value";
case AT_string_length: return "AT_string_length";
case AT_common_reference: return "AT_common_reference";
case AT_comp_dir: return "AT_comp_dir";
case AT_const_value_string: return "AT_const_value_string";
case AT_const_value_data2: return "AT_const_value_data2";
case AT_const_value_data4: return "AT_const_value_data4";
case AT_const_value_data8: return "AT_const_value_data8";
case AT_const_value_block2: return "AT_const_value_block2";
case AT_const_value_block4: return "AT_const_value_block4";
case AT_containing_type: return "AT_containing_type";
case AT_default_value_addr: return "AT_default_value_addr";
case AT_default_value_data2: return "AT_default_value_data2";
case AT_default_value_data4: return "AT_default_value_data4";
case AT_default_value_data8: return "AT_default_value_data8";
case AT_default_value_string: return "AT_default_value_string";
case AT_friends: return "AT_friends";
case AT_inline: return "AT_inline";
case AT_is_optional: return "AT_is_optional";
case AT_lower_bound_ref: return "AT_lower_bound_ref";
case AT_lower_bound_data2: return "AT_lower_bound_data2";
case AT_lower_bound_data4: return "AT_lower_bound_data4";
case AT_lower_bound_data8: return "AT_lower_bound_data8";
case AT_private: return "AT_private";
case AT_producer: return "AT_producer";
case AT_program: return "AT_program";
case AT_protected: return "AT_protected";
case AT_prototyped: return "AT_prototyped";
case AT_public: return "AT_public";
case AT_pure_virtual: return "AT_pure_virtual";
case AT_return_addr: return "AT_return_addr";
case AT_abstract_origin: return "AT_abstract_origin";
case AT_start_scope: return "AT_start_scope";
case AT_stride_size: return "AT_stride_size";
case AT_upper_bound_ref: return "AT_upper_bound_ref";
case AT_upper_bound_data2: return "AT_upper_bound_data2";
case AT_upper_bound_data4: return "AT_upper_bound_data4";
case AT_upper_bound_data8: return "AT_upper_bound_data8";
case AT_virtual: return "AT_virtual";
/* GNU extensions */
case AT_sf_names: return "AT_sf_names";
case AT_src_info: return "AT_src_info";
case AT_mac_info: return "AT_mac_info";
case AT_src_coords: return "AT_src_coords";
case AT_body_begin: return "AT_body_begin";
case AT_body_end: return "AT_body_end";
default: return "AT_<unknown>";
}
}
static char *
dwarf_stack_op_name (op)
register unsigned op;
{
switch (op)
{
case OP_REG: return "OP_REG";
case OP_BASEREG: return "OP_BASEREG";
case OP_ADDR: return "OP_ADDR";
case OP_CONST: return "OP_CONST";
case OP_DEREF2: return "OP_DEREF2";
case OP_DEREF4: return "OP_DEREF4";
case OP_ADD: return "OP_ADD";
default: return "OP_<unknown>";
}
}
static char *
dwarf_typemod_name (mod)
register unsigned mod;
{
switch (mod)
{
case MOD_pointer_to: return "MOD_pointer_to";
case MOD_reference_to: return "MOD_reference_to";
case MOD_const: return "MOD_const";
case MOD_volatile: return "MOD_volatile";
default: return "MOD_<unknown>";
}
}
static char *
dwarf_fmt_byte_name (fmt)
register unsigned fmt;
{
switch (fmt)
{
case FMT_FT_C_C: return "FMT_FT_C_C";
case FMT_FT_C_X: return "FMT_FT_C_X";
case FMT_FT_X_C: return "FMT_FT_X_C";
case FMT_FT_X_X: return "FMT_FT_X_X";
case FMT_UT_C_C: return "FMT_UT_C_C";
case FMT_UT_C_X: return "FMT_UT_C_X";
case FMT_UT_X_C: return "FMT_UT_X_C";
case FMT_UT_X_X: return "FMT_UT_X_X";
case FMT_ET: return "FMT_ET";
default: return "FMT_<unknown>";
}
}
static char *
dwarf_fund_type_name (ft)
register unsigned ft;
{
switch (ft)
{
case FT_char: return "FT_char";
case FT_signed_char: return "FT_signed_char";
case FT_unsigned_char: return "FT_unsigned_char";
case FT_short: return "FT_short";
case FT_signed_short: return "FT_signed_short";
case FT_unsigned_short: return "FT_unsigned_short";
case FT_integer: return "FT_integer";
case FT_signed_integer: return "FT_signed_integer";
case FT_unsigned_integer: return "FT_unsigned_integer";
case FT_long: return "FT_long";
case FT_signed_long: return "FT_signed_long";
case FT_unsigned_long: return "FT_unsigned_long";
case FT_pointer: return "FT_pointer";
case FT_float: return "FT_float";
case FT_dbl_prec_float: return "FT_dbl_prec_float";
case FT_ext_prec_float: return "FT_ext_prec_float";
case FT_complex: return "FT_complex";
case FT_dbl_prec_complex: return "FT_dbl_prec_complex";
case FT_void: return "FT_void";
case FT_boolean: return "FT_boolean";
case FT_ext_prec_complex: return "FT_ext_prec_complex";
case FT_label: return "FT_label";
/* GNU extensions. */
case FT_long_long: return "FT_long_long";
case FT_signed_long_long: return "FT_signed_long_long";
case FT_unsigned_long_long: return "FT_unsigned_long_long";
case FT_int8: return "FT_int8";
case FT_signed_int8: return "FT_signed_int8";
case FT_unsigned_int8: return "FT_unsigned_int8";
case FT_int16: return "FT_int16";
case FT_signed_int16: return "FT_signed_int16";
case FT_unsigned_int16: return "FT_unsigned_int16";
case FT_int32: return "FT_int32";
case FT_signed_int32: return "FT_signed_int32";
case FT_unsigned_int32: return "FT_unsigned_int32";
case FT_int64: return "FT_int64";
case FT_signed_int64: return "FT_signed_int64";
case FT_unsigned_int64: return "FT_unsigned_int64";
case FT_real32: return "FT_real32";
case FT_real64: return "FT_real64";
case FT_real96: return "FT_real96";
case FT_real128: return "FT_real128";
default: return "FT_<unknown>";
}
}
/* Determine the "ultimate origin" of a decl. The decl may be an
inlined instance of an inlined instance of a decl which is local
to an inline function, so we have to trace all of the way back
through the origin chain to find out what sort of node actually
served as the original seed for the given block. */
static tree
decl_ultimate_origin (decl)
register tree decl;
{
register tree immediate_origin = DECL_ABSTRACT_ORIGIN (decl);
if (immediate_origin == NULL)
return NULL;
else
{
register tree ret_val;
register tree lookahead = immediate_origin;
do
{
ret_val = lookahead;
lookahead = DECL_ABSTRACT_ORIGIN (ret_val);
}
while (lookahead != NULL && lookahead != ret_val);
return ret_val;
}
}
/* Determine the "ultimate origin" of a block. The block may be an
inlined instance of an inlined instance of a block which is local
to an inline function, so we have to trace all of the way back
through the origin chain to find out what sort of node actually
served as the original seed for the given block. */
static tree
block_ultimate_origin (block)
register tree block;
{
register tree immediate_origin = BLOCK_ABSTRACT_ORIGIN (block);
if (immediate_origin == NULL)
return NULL;
else
{
register tree ret_val;
register tree lookahead = immediate_origin;
do
{
ret_val = lookahead;
lookahead = (TREE_CODE (ret_val) == BLOCK)
? BLOCK_ABSTRACT_ORIGIN (ret_val)
: NULL;
}
while (lookahead != NULL && lookahead != ret_val);
return ret_val;
}
}
/* Get the class to which DECL belongs, if any. In g++, the DECL_CONTEXT
of a virtual function may refer to a base class, so we check the 'this'
parameter. */
static tree
decl_class_context (decl)
tree decl;
{
tree context = NULL_TREE;
if (TREE_CODE (decl) != FUNCTION_DECL || ! DECL_VINDEX (decl))
context = DECL_CONTEXT (decl);
else
context = TYPE_MAIN_VARIANT
(TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
if (context && TREE_CODE_CLASS (TREE_CODE (context)) != 't')
context = NULL_TREE;
return context;
}
#if 0
static void
output_unsigned_leb128 (value)
register unsigned long value;
{
register unsigned long orig_value = value;
do
{
register unsigned byte = (value & 0x7f);
value >>= 7;
if (value != 0) /* more bytes to follow */
byte |= 0x80;
fprintf (asm_out_file, "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) byte);
if (flag_debug_asm && value == 0)
fprintf (asm_out_file, "\t%s ULEB128 number - value = %lu",
ASM_COMMENT_START, orig_value);
fputc ('\n', asm_out_file);
}
while (value != 0);
}
static void
output_signed_leb128 (value)
register long value;
{
register long orig_value = value;
register int negative = (value < 0);
register int more;
do
{
register unsigned byte = (value & 0x7f);
value >>= 7;
if (negative)
value |= 0xfe000000; /* manually sign extend */
if (((value == 0) && ((byte & 0x40) == 0))
|| ((value == -1) && ((byte & 0x40) == 1)))
more = 0;
else
{
byte |= 0x80;
more = 1;
}
fprintf (asm_out_file, "\t%s\t0x%x", ASM_BYTE_OP, (unsigned) byte);
if (flag_debug_asm && more == 0)
fprintf (asm_out_file, "\t%s SLEB128 number - value = %ld",
ASM_COMMENT_START, orig_value);
fputc ('\n', asm_out_file);
}
while (more);
}
#endif
/**************** utility functions for attribute functions ******************/
/* Given a pointer to a BLOCK node return non-zero if (and only if) the
node in question represents the outermost pair of curly braces (i.e.
the "body block") of a function or method.
For any BLOCK node representing a "body block" of a function or method,
the BLOCK_SUPERCONTEXT of the node will point to another BLOCK node
which represents the outermost (function) scope for the function or
method (i.e. the one which includes the formal parameters). The
BLOCK_SUPERCONTEXT of *that* node in turn will point to the relevant
FUNCTION_DECL node.
*/
static inline int
is_body_block (stmt)
register tree stmt;
{
if (TREE_CODE (stmt) == BLOCK)
{
register tree parent = BLOCK_SUPERCONTEXT (stmt);
if (TREE_CODE (parent) == BLOCK)
{
register tree grandparent = BLOCK_SUPERCONTEXT (parent);
if (TREE_CODE (grandparent) == FUNCTION_DECL)
return 1;
}
}
return 0;
}
/* Given a pointer to a tree node for some type, return a Dwarf fundamental
type code for the given type.
This routine must only be called for GCC type nodes that correspond to
Dwarf fundamental types.
The current Dwarf draft specification calls for Dwarf fundamental types
to accurately reflect the fact that a given type was either a "plain"
integral type or an explicitly "signed" integral type. Unfortunately,
we can't always do this, because GCC may already have thrown away the
information about the precise way in which the type was originally
specified, as in:
typedef signed int my_type;
struct s { my_type f; };
Since we may be stuck here without enought information to do exactly
what is called for in the Dwarf draft specification, we do the best
that we can under the circumstances and always use the "plain" integral
fundamental type codes for int, short, and long types. That's probably
good enough. The additional accuracy called for in the current DWARF
draft specification is probably never even useful in practice. */
static int
fundamental_type_code (type)
register tree type;
{
if (TREE_CODE (type) == ERROR_MARK)
return 0;
switch (TREE_CODE (type))
{
case ERROR_MARK:
return FT_void;
case VOID_TYPE:
return FT_void;
case INTEGER_TYPE:
/* Carefully distinguish all the standard types of C,
without messing up if the language is not C.
Note that we check only for the names that contain spaces;
other names might occur by coincidence in other languages. */
if (TYPE_NAME (type) != 0
&& TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& DECL_NAME (TYPE_NAME (type)) != 0
&& TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE)
{
char *name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
if (!strcmp (name, "unsigned char"))
return FT_unsigned_char;
if (!strcmp (name, "signed char"))
return FT_signed_char;
if (!strcmp (name, "unsigned int"))
return FT_unsigned_integer;
if (!strcmp (name, "short int"))
return FT_short;
if (!strcmp (name, "short unsigned int"))
return FT_unsigned_short;
if (!strcmp (name, "long int"))
return FT_long;
if (!strcmp (name, "long unsigned int"))
return FT_unsigned_long;
if (!strcmp (name, "long long int"))
return FT_long_long; /* Not grok'ed by svr4 SDB */
if (!strcmp (name, "long long unsigned int"))
return FT_unsigned_long_long; /* Not grok'ed by svr4 SDB */
}
/* Most integer types will be sorted out above, however, for the
sake of special `array index' integer types, the following code
is also provided. */
if (TYPE_PRECISION (type) == INT_TYPE_SIZE)
return (TREE_UNSIGNED (type) ? FT_unsigned_integer : FT_integer);
if (TYPE_PRECISION (type) == LONG_TYPE_SIZE)
return (TREE_UNSIGNED (type) ? FT_unsigned_long : FT_long);
if (TYPE_PRECISION (type) == LONG_LONG_TYPE_SIZE)
return (TREE_UNSIGNED (type) ? FT_unsigned_long_long : FT_long_long);
if (TYPE_PRECISION (type) == SHORT_TYPE_SIZE)
return (TREE_UNSIGNED (type) ? FT_unsigned_short : FT_short);
if (TYPE_PRECISION (type) == CHAR_TYPE_SIZE)
return (TREE_UNSIGNED (type) ? FT_unsigned_char : FT_char);
abort ();
case REAL_TYPE:
/* Carefully distinguish all the standard types of C,
without messing up if the language is not C. */
if (TYPE_NAME (type) != 0
&& TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& DECL_NAME (TYPE_NAME (type)) != 0
&& TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE)
{
char *name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
/* Note that here we can run afowl of a serious bug in "classic"
svr4 SDB debuggers. They don't seem to understand the
FT_ext_prec_float type (even though they should). */
if (!strcmp (name, "long double"))
return FT_ext_prec_float;
}
if (TYPE_PRECISION (type) == DOUBLE_TYPE_SIZE)
return FT_dbl_prec_float;
if (TYPE_PRECISION (type) == FLOAT_TYPE_SIZE)
return FT_float;
/* Note that here we can run afowl of a serious bug in "classic"
svr4 SDB debuggers. They don't seem to understand the
FT_ext_prec_float type (even though they should). */
if (TYPE_PRECISION (type) == LONG_DOUBLE_TYPE_SIZE)
return FT_ext_prec_float;
abort ();
case COMPLEX_TYPE:
return FT_complex; /* GNU FORTRAN COMPLEX type. */
case CHAR_TYPE:
return FT_char; /* GNU Pascal CHAR type. Not used in C. */
case BOOLEAN_TYPE:
return FT_boolean; /* GNU FORTRAN BOOLEAN type. */
default:
abort (); /* No other TREE_CODEs are Dwarf fundamental types. */
}
return 0;
}
/* Given a pointer to an arbitrary ..._TYPE tree node, return a pointer to
the Dwarf "root" type for the given input type. The Dwarf "root" type
of a given type is generally the same as the given type, except that if
the given type is a pointer or reference type, then the root type of
the given type is the root type of the "basis" type for the pointer or
reference type. (This definition of the "root" type is recursive.)
Also, the root type of a `const' qualified type or a `volatile'
qualified type is the root type of the given type without the
qualifiers. */
static tree
root_type_1 (type, count)
register tree type;
register int count;
{
/* Give up after searching 1000 levels, in case this is a recursive
pointer type. Such types are possible in Ada, but it is not possible
to represent them in DWARF1 debug info. */
if (count > 1000)
return error_mark_node;
switch (TREE_CODE (type))
{
case ERROR_MARK:
return error_mark_node;
case POINTER_TYPE:
case REFERENCE_TYPE:
return root_type_1 (TREE_TYPE (type), count+1);
default:
return type;
}
}
static tree
root_type (type)
register tree type;
{
type = root_type_1 (type, 0);
if (type != error_mark_node)
type = type_main_variant (type);
return type;
}
/* Given a pointer to an arbitrary ..._TYPE tree node, write out a sequence
of zero or more Dwarf "type-modifier" bytes applicable to the type. */
static void
write_modifier_bytes_1 (type, decl_const, decl_volatile, count)
register tree type;
register int decl_const;
register int decl_volatile;
register int count;
{
if (TREE_CODE (type) == ERROR_MARK)
return;
/* Give up after searching 1000 levels, in case this is a recursive
pointer type. Such types are possible in Ada, but it is not possible
to represent them in DWARF1 debug info. */
if (count > 1000)
return;
if (TYPE_READONLY (type) || decl_const)
ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_const);
if (TYPE_VOLATILE (type) || decl_volatile)
ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_volatile);
switch (TREE_CODE (type))
{
case POINTER_TYPE:
ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_pointer_to);
write_modifier_bytes_1 (TREE_TYPE (type), 0, 0, count+1);
return;
case REFERENCE_TYPE:
ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_reference_to);
write_modifier_bytes_1 (TREE_TYPE (type), 0, 0, count+1);
return;
case ERROR_MARK:
default:
return;
}
}
static void
write_modifier_bytes (type, decl_const, decl_volatile)
register tree type;
register int decl_const;
register int decl_volatile;
{
write_modifier_bytes_1 (type, decl_const, decl_volatile, 0);
}
/* Given a pointer to an arbitrary ..._TYPE tree node, return non-zero if the
given input type is a Dwarf "fundamental" type. Otherwise return zero. */
static inline int
type_is_fundamental (type)
register tree type;
{
switch (TREE_CODE (type))
{
case ERROR_MARK:
case VOID_TYPE:
case INTEGER_TYPE:
case REAL_TYPE:
case COMPLEX_TYPE:
case BOOLEAN_TYPE:
case CHAR_TYPE:
return 1;
case SET_TYPE:
case ARRAY_TYPE:
case RECORD_TYPE:
case UNION_TYPE:
case QUAL_UNION_TYPE:
case ENUMERAL_TYPE:
case FUNCTION_TYPE:
case METHOD_TYPE:
case POINTER_TYPE:
case REFERENCE_TYPE:
case FILE_TYPE:
case OFFSET_TYPE:
case LANG_TYPE:
return 0;
default:
abort ();
}
return 0;
}
/* Given a pointer to some ..._DECL tree node, generate an assembly language
equate directive which will associate a symbolic name with the current DIE.
The name used is an artificial label generated from the DECL_UID number
associated with the given decl node. The name it gets equated to is the
symbolic label that we (previously) output at the start of the DIE that
we are currently generating.
Calling this function while generating some "decl related" form of DIE
makes it possible to later refer to the DIE which represents the given
decl simply by re-generating the symbolic name from the ..._DECL node's
UID number. */
static void
equate_decl_number_to_die_number (decl)
register tree decl;
{
/* In the case where we are generating a DIE for some ..._DECL node
which represents either some inline function declaration or some
entity declared within an inline function declaration/definition,
setup a symbolic name for the current DIE so that we have a name
for this DIE that we can easily refer to later on within
AT_abstract_origin attributes. */
char decl_label[MAX_ARTIFICIAL_LABEL_BYTES];
char die_label[MAX_ARTIFICIAL_LABEL_BYTES];
sprintf (decl_label, DECL_NAME_FMT, DECL_UID (decl));
sprintf (die_label, DIE_BEGIN_LABEL_FMT, current_dienum);
ASM_OUTPUT_DEF (asm_out_file, decl_label, die_label);
}
/* Given a pointer to some ..._TYPE tree node, generate an assembly language
equate directive which will associate a symbolic name with the current DIE.
The name used is an artificial label generated from the TYPE_UID number
associated with the given type node. The name it gets equated to is the
symbolic label that we (previously) output at the start of the DIE that
we are currently generating.
Calling this function while generating some "type related" form of DIE
makes it easy to later refer to the DIE which represents the given type
simply by re-generating the alternative name from the ..._TYPE node's
UID number. */
static inline void
equate_type_number_to_die_number (type)
register tree type;
{
char type_label[MAX_ARTIFICIAL_LABEL_BYTES];
char die_label[MAX_ARTIFICIAL_LABEL_BYTES];
/* We are generating a DIE to represent the main variant of this type
(i.e the type without any const or volatile qualifiers) so in order
to get the equate to come out right, we need to get the main variant
itself here. */
type = type_main_variant (type);
sprintf (type_label, TYPE_NAME_FMT, TYPE_UID (type));
sprintf (die_label, DIE_BEGIN_LABEL_FMT, current_dienum);
ASM_OUTPUT_DEF (asm_out_file, type_label, die_label);
}
static void
output_reg_number (rtl)
register rtx rtl;
{
register unsigned regno = REGNO (rtl);
if (regno >= FIRST_PSEUDO_REGISTER)
{
warning_with_decl (dwarf_last_decl, "internal regno botch: regno = %d\n",
regno);
regno = 0;
}
fprintf (asm_out_file, "\t%s\t0x%x",
UNALIGNED_INT_ASM_OP, DBX_REGISTER_NUMBER (regno));
if (flag_debug_asm)
{
fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
PRINT_REG (rtl, 0, asm_out_file);
}
fputc ('\n', asm_out_file);
}
/* The following routine is a nice and simple transducer. It converts the
RTL for a variable or parameter (resident in memory) into an equivalent
Dwarf representation of a mechanism for getting the address of that same
variable onto the top of a hypothetical "address evaluation" stack.
When creating memory location descriptors, we are effectively trans-
forming the RTL for a memory-resident object into its Dwarf postfix
expression equivalent. This routine just recursively descends an
RTL tree, turning it into Dwarf postfix code as it goes. */
static void
output_mem_loc_descriptor (rtl)
register rtx rtl;
{
/* Note that for a dynamically sized array, the location we will
generate a description of here will be the lowest numbered location
which is actually within the array. That's *not* necessarily the
same as the zeroth element of the array. */
switch (GET_CODE (rtl))
{
case SUBREG:
/* The case of a subreg may arise when we have a local (register)
variable or a formal (register) parameter which doesn't quite
fill up an entire register. For now, just assume that it is
legitimate to make the Dwarf info refer to the whole register
which contains the given subreg. */
rtl = XEXP (rtl, 0);
/* Drop thru. */
case REG:
/* Whenever a register number forms a part of the description of
the method for calculating the (dynamic) address of a memory
resident object, DWARF rules require the register number to
be referred to as a "base register". This distinction is not
based in any way upon what category of register the hardware
believes the given register belongs to. This is strictly
DWARF terminology we're dealing with here.
Note that in cases where the location of a memory-resident data
object could be expressed as:
OP_ADD (OP_BASEREG (basereg), OP_CONST (0))
the actual DWARF location descriptor that we generate may just
be OP_BASEREG (basereg). This may look deceptively like the
object in question was allocated to a register (rather than
in memory) so DWARF consumers need to be aware of the subtle
distinction between OP_REG and OP_BASEREG. */
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_BASEREG);
output_reg_number (rtl);
break;
case MEM:
output_mem_loc_descriptor (XEXP (rtl, 0));
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_DEREF4);
break;
case CONST:
case SYMBOL_REF:
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADDR);
ASM_OUTPUT_DWARF_ADDR_CONST (asm_out_file, rtl);
break;
case PLUS:
output_mem_loc_descriptor (XEXP (rtl, 0));
output_mem_loc_descriptor (XEXP (rtl, 1));
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADD);
break;
case CONST_INT:
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_CONST);
ASM_OUTPUT_DWARF_DATA4 (asm_out_file, INTVAL (rtl));
break;
case MULT:
/* If a pseudo-reg is optimized away, it is possible for it to
be replaced with a MEM containing a multiply. Use a GNU extension
to describe it. */
output_mem_loc_descriptor (XEXP (rtl, 0));
output_mem_loc_descriptor (XEXP (rtl, 1));
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_MULT);
break;
default:
abort ();
}
}
/* Output a proper Dwarf location descriptor for a variable or parameter
which is either allocated in a register or in a memory location. For
a register, we just generate an OP_REG and the register number. For a
memory location we provide a Dwarf postfix expression describing how to
generate the (dynamic) address of the object onto the address stack. */
static void
output_loc_descriptor (rtl)
register rtx rtl;
{
switch (GET_CODE (rtl))
{
case SUBREG:
/* The case of a subreg may arise when we have a local (register)
variable or a formal (register) parameter which doesn't quite
fill up an entire register. For now, just assume that it is
legitimate to make the Dwarf info refer to the whole register
which contains the given subreg. */
rtl = XEXP (rtl, 0);
/* Drop thru. */
case REG:
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_REG);
output_reg_number (rtl);
break;
case MEM:
output_mem_loc_descriptor (XEXP (rtl, 0));
break;
default:
abort (); /* Should never happen */
}
}
/* Given a tree node describing an array bound (either lower or upper)
output a representation for that bound. */
static void
output_bound_representation (bound, dim_num, u_or_l)
register tree bound;
register unsigned dim_num; /* For multi-dimensional arrays. */
register char u_or_l; /* Designates upper or lower bound. */
{
switch (TREE_CODE (bound))
{
case ERROR_MARK:
return;
/* All fixed-bounds are represented by INTEGER_CST nodes. */
case INTEGER_CST:
ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
(unsigned) TREE_INT_CST_LOW (bound));
break;
default:
/* Dynamic bounds may be represented by NOP_EXPR nodes containing
SAVE_EXPR nodes, in which case we can do something, or as
an expression, which we cannot represent. */
{
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
sprintf (begin_label, BOUND_BEGIN_LABEL_FMT,
current_dienum, dim_num, u_or_l);
sprintf (end_label, BOUND_END_LABEL_FMT,
current_dienum, dim_num, u_or_l);
ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
/* If optimization is turned on, the SAVE_EXPRs that describe
how to access the upper bound values are essentially bogus.
They only describe (at best) how to get at these values at
the points in the generated code right after they have just
been computed. Worse yet, in the typical case, the upper
bound values will not even *be* computed in the optimized
code, so these SAVE_EXPRs are entirely bogus.
In order to compensate for this fact, we check here to see
if optimization is enabled, and if so, we effectively create
an empty location description for the (unknown and unknowable)
upper bound.
This should not cause too much trouble for existing (stupid?)
debuggers because they have to deal with empty upper bounds
location descriptions anyway in order to be able to deal with
incomplete array types.
Of course an intelligent debugger (GDB?) should be able to
comprehend that a missing upper bound specification in a
array type used for a storage class `auto' local array variable
indicates that the upper bound is both unknown (at compile-
time) and unknowable (at run-time) due to optimization. */
if (! optimize)
{
while (TREE_CODE (bound) == NOP_EXPR
|| TREE_CODE (bound) == CONVERT_EXPR)
bound = TREE_OPERAND (bound, 0);
if (TREE_CODE (bound) == SAVE_EXPR)
output_loc_descriptor
(eliminate_regs (SAVE_EXPR_RTL (bound), 0, NULL_RTX));
}
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
break;
}
}
/* Recursive function to output a sequence of value/name pairs for
enumeration constants in reversed order. This is called from
enumeration_type_die. */
static void
output_enumeral_list (link)
register tree link;
{
if (link)
{
output_enumeral_list (TREE_CHAIN (link));
ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
(unsigned) TREE_INT_CST_LOW (TREE_VALUE (link)));
ASM_OUTPUT_DWARF_STRING (asm_out_file,
IDENTIFIER_POINTER (TREE_PURPOSE (link)));
}
}
/* Given an unsigned value, round it up to the lowest multiple of `boundary'
which is not less than the value itself. */
static inline unsigned
ceiling (value, boundary)
register unsigned value;
register unsigned boundary;
{
return (((value + boundary - 1) / boundary) * boundary);
}
/* Given a pointer to what is assumed to be a FIELD_DECL node, return a
pointer to the declared type for the relevant field variable, or return
`integer_type_node' if the given node turns out to be an ERROR_MARK node. */
static inline tree
field_type (decl)
register tree decl;
{
register tree type;
if (TREE_CODE (decl) == ERROR_MARK)
return integer_type_node;
type = DECL_BIT_FIELD_TYPE (decl);
if (type == NULL)
type = TREE_TYPE (decl);
return type;
}
/* Given a pointer to a tree node, assumed to be some kind of a ..._TYPE
node, return the alignment in bits for the type, or else return
BITS_PER_WORD if the node actually turns out to be an ERROR_MARK node. */
static inline unsigned
simple_type_align_in_bits (type)
register tree type;
{
return (TREE_CODE (type) != ERROR_MARK) ? TYPE_ALIGN (type) : BITS_PER_WORD;
}
/* Given a pointer to a tree node, assumed to be some kind of a ..._TYPE
node, return the size in bits for the type if it is a constant, or
else return the alignment for the type if the type's size is not
constant, or else return BITS_PER_WORD if the type actually turns out
to be an ERROR_MARK node. */
static inline unsigned
simple_type_size_in_bits (type)
register tree type;
{
if (TREE_CODE (type) == ERROR_MARK)
return BITS_PER_WORD;
else
{
register tree type_size_tree = TYPE_SIZE (type);
if (TREE_CODE (type_size_tree) != INTEGER_CST)
return TYPE_ALIGN (type);
return (unsigned) TREE_INT_CST_LOW (type_size_tree);
}
}
/* Given a pointer to what is assumed to be a FIELD_DECL node, compute and
return the byte offset of the lowest addressed byte of the "containing
object" for the given FIELD_DECL, or return 0 if we are unable to deter-
mine what that offset is, either because the argument turns out to be a
pointer to an ERROR_MARK node, or because the offset is actually variable.
(We can't handle the latter case just yet.) */
static unsigned
field_byte_offset (decl)
register tree decl;
{
register unsigned type_align_in_bytes;
register unsigned type_align_in_bits;
register unsigned type_size_in_bits;
register unsigned object_offset_in_align_units;
register unsigned object_offset_in_bits;
register unsigned object_offset_in_bytes;
register tree type;
register tree bitpos_tree;
register tree field_size_tree;
register unsigned bitpos_int;
register unsigned deepest_bitpos;
register unsigned field_size_in_bits;
if (TREE_CODE (decl) == ERROR_MARK)
return 0;
if (TREE_CODE (decl) != FIELD_DECL)
abort ();
type = field_type (decl);
bitpos_tree = DECL_FIELD_BITPOS (decl);
field_size_tree = DECL_SIZE (decl);
/* We cannot yet cope with fields whose positions or sizes are variable,
so for now, when we see such things, we simply return 0. Someday,
we may be able to handle such cases, but it will be damn difficult. */
if (TREE_CODE (bitpos_tree) != INTEGER_CST)
return 0;
bitpos_int = (unsigned) TREE_INT_CST_LOW (bitpos_tree);
if (TREE_CODE (field_size_tree) != INTEGER_CST)
return 0;
field_size_in_bits = (unsigned) TREE_INT_CST_LOW (field_size_tree);
type_size_in_bits = simple_type_size_in_bits (type);
type_align_in_bits = simple_type_align_in_bits (type);
type_align_in_bytes = type_align_in_bits / BITS_PER_UNIT;
/* Note that the GCC front-end doesn't make any attempt to keep track
of the starting bit offset (relative to the start of the containing
structure type) of the hypothetical "containing object" for a bit-
field. Thus, when computing the byte offset value for the start of
the "containing object" of a bit-field, we must deduce this infor-
mation on our own.
This can be rather tricky to do in some cases. For example, handling
the following structure type definition when compiling for an i386/i486
target (which only aligns long long's to 32-bit boundaries) can be very
tricky:
struct S {
int field1;
long long field2:31;
};
Fortunately, there is a simple rule-of-thumb which can be used in such
cases. When compiling for an i386/i486, GCC will allocate 8 bytes for
the structure shown above. It decides to do this based upon one simple
rule for bit-field allocation. Quite simply, GCC allocates each "con-
taining object" for each bit-field at the first (i.e. lowest addressed)
legitimate alignment boundary (based upon the required minimum alignment
for the declared type of the field) which it can possibly use, subject
to the condition that there is still enough available space remaining
in the containing object (when allocated at the selected point) to
fully accommodate all of the bits of the bit-field itself.
This simple rule makes it obvious why GCC allocates 8 bytes for each
object of the structure type shown above. When looking for a place to
allocate the "containing object" for `field2', the compiler simply tries
to allocate a 64-bit "containing object" at each successive 32-bit
boundary (starting at zero) until it finds a place to allocate that 64-
bit field such that at least 31 contiguous (and previously unallocated)
bits remain within that selected 64 bit field. (As it turns out, for
the example above, the compiler finds that it is OK to allocate the
"containing object" 64-bit field at bit-offset zero within the
structure type.)
Here we attempt to work backwards from the limited set of facts we're
given, and we try to deduce from those facts, where GCC must have
believed that the containing object started (within the structure type).
The value we deduce is then used (by the callers of this routine) to
generate AT_location and AT_bit_offset attributes for fields (both
bit-fields and, in the case of AT_location, regular fields as well).
*/
/* Figure out the bit-distance from the start of the structure to the
"deepest" bit of the bit-field. */
deepest_bitpos = bitpos_int + field_size_in_bits;
/* This is the tricky part. Use some fancy footwork to deduce where the
lowest addressed bit of the containing object must be. */
object_offset_in_bits
= ceiling (deepest_bitpos, type_align_in_bits) - type_size_in_bits;
/* Compute the offset of the containing object in "alignment units". */
object_offset_in_align_units = object_offset_in_bits / type_align_in_bits;
/* Compute the offset of the containing object in bytes. */
object_offset_in_bytes = object_offset_in_align_units * type_align_in_bytes;
/* The above code assumes that the field does not cross an alignment
boundary. This can happen if PCC_BITFIELD_TYPE_MATTERS is not defined,
or if the structure is packed. If this happens, then we get an object
which starts after the bitfield, which means that the bit offset is
negative. Gdb fails when given negative bit offsets. We avoid this
by recomputing using the first bit of the bitfield. This will give
us an object which does not completely contain the bitfield, but it
will be aligned, and it will contain the first bit of the bitfield. */
if (object_offset_in_bits > bitpos_int)
{
deepest_bitpos = bitpos_int + 1;
object_offset_in_bits
= ceiling (deepest_bitpos, type_align_in_bits) - type_size_in_bits;
object_offset_in_align_units = (object_offset_in_bits
/ type_align_in_bits);
object_offset_in_bytes = (object_offset_in_align_units
* type_align_in_bytes);
}
return object_offset_in_bytes;
}
/****************************** attributes *********************************/
/* The following routines are responsible for writing out the various types
of Dwarf attributes (and any following data bytes associated with them).
These routines are listed in order based on the numerical codes of their
associated attributes. */
/* Generate an AT_sibling attribute. */
static inline void
sibling_attribute ()
{
char label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_sibling);
sprintf (label, DIE_BEGIN_LABEL_FMT, NEXT_DIE_NUM);
ASM_OUTPUT_DWARF_REF (asm_out_file, label);
}
/* Output the form of location attributes suitable for whole variables and
whole parameters. Note that the location attributes for struct fields
are generated by the routine `data_member_location_attribute' below. */
static void
location_attribute (rtl)
register rtx rtl;
{
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_location);
sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
/* Handle a special case. If we are about to output a location descriptor
for a variable or parameter which has been optimized out of existence,
don't do that. Instead we output a zero-length location descriptor
value as part of the location attribute.
A variable which has been optimized out of existence will have a
DECL_RTL value which denotes a pseudo-reg.
Currently, in some rare cases, variables can have DECL_RTL values
which look like (MEM (REG pseudo-reg#)). These cases are due to
bugs elsewhere in the compiler. We treat such cases
as if the variable(s) in question had been optimized out of existence.
Note that in all cases where we wish to express the fact that a
variable has been optimized out of existence, we do not simply
suppress the generation of the entire location attribute because
the absence of a location attribute in certain kinds of DIEs is
used to indicate something else entirely... i.e. that the DIE
represents an object declaration, but not a definition. So saith
the PLSIG.
*/
if (! is_pseudo_reg (rtl)
&& (GET_CODE (rtl) != MEM || ! is_pseudo_reg (XEXP (rtl, 0))))
output_loc_descriptor (rtl);
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
/* Output the specialized form of location attribute used for data members
of struct and union types.
In the special case of a FIELD_DECL node which represents a bit-field,
the "offset" part of this special location descriptor must indicate the
distance in bytes from the lowest-addressed byte of the containing
struct or union type to the lowest-addressed byte of the "containing
object" for the bit-field. (See the `field_byte_offset' function above.)
For any given bit-field, the "containing object" is a hypothetical
object (of some integral or enum type) within which the given bit-field
lives. The type of this hypothetical "containing object" is always the
same as the declared type of the individual bit-field itself (for GCC
anyway... the DWARF spec doesn't actually mandate this).
Note that it is the size (in bytes) of the hypothetical "containing
object" which will be given in the AT_byte_size attribute for this
bit-field. (See the `byte_size_attribute' function below.) It is
also used when calculating the value of the AT_bit_offset attribute.
(See the `bit_offset_attribute' function below.) */
static void
data_member_location_attribute (t)
register tree t;
{
register unsigned object_offset_in_bytes;
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
if (TREE_CODE (t) == TREE_VEC)
object_offset_in_bytes = TREE_INT_CST_LOW (BINFO_OFFSET (t));
else
object_offset_in_bytes = field_byte_offset (t);
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_location);
sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_CONST);
ASM_OUTPUT_DWARF_DATA4 (asm_out_file, object_offset_in_bytes);
ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADD);
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
/* Output an AT_const_value attribute for a variable or a parameter which
does not have a "location" either in memory or in a register. These
things can arise in GNU C when a constant is passed as an actual
parameter to an inlined function. They can also arise in C++ where
declared constants do not necessarily get memory "homes". */
static void
const_value_attribute (rtl)
register rtx rtl;
{
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_const_value_block4);
sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
switch (GET_CODE (rtl))
{
case CONST_INT:
/* Note that a CONST_INT rtx could represent either an integer or
a floating-point constant. A CONST_INT is used whenever the
constant will fit into a single word. In all such cases, the
original mode of the constant value is wiped out, and the
CONST_INT rtx is assigned VOIDmode. Since we no longer have
precise mode information for these constants, we always just
output them using 4 bytes. */
ASM_OUTPUT_DWARF_DATA4 (asm_out_file, (unsigned) INTVAL (rtl));
break;
case CONST_DOUBLE:
/* Note that a CONST_DOUBLE rtx could represent either an integer
or a floating-point constant. A CONST_DOUBLE is used whenever
the constant requires more than one word in order to be adequately
represented. In all such cases, the original mode of the constant
value is preserved as the mode of the CONST_DOUBLE rtx, but for
simplicity we always just output CONST_DOUBLEs using 8 bytes. */
ASM_OUTPUT_DWARF_DATA8 (asm_out_file,
(unsigned HOST_WIDE_INT) CONST_DOUBLE_HIGH (rtl),
(unsigned HOST_WIDE_INT) CONST_DOUBLE_LOW (rtl));
break;
case CONST_STRING:
ASM_OUTPUT_DWARF_STRING (asm_out_file, XSTR (rtl, 0));
break;
case SYMBOL_REF:
case LABEL_REF:
case CONST:
ASM_OUTPUT_DWARF_ADDR_CONST (asm_out_file, rtl);
break;
case PLUS:
/* In cases where an inlined instance of an inline function is passed
the address of an `auto' variable (which is local to the caller)
we can get a situation where the DECL_RTL of the artificial
local variable (for the inlining) which acts as a stand-in for
the corresponding formal parameter (of the inline function)
will look like (plus:SI (reg:SI FRAME_PTR) (const_int ...)).
This is not exactly a compile-time constant expression, but it
isn't the address of the (artificial) local variable either.
Rather, it represents the *value* which the artificial local
variable always has during its lifetime. We currently have no
way to represent such quasi-constant values in Dwarf, so for now
we just punt and generate an AT_const_value attribute with form
FORM_BLOCK4 and a length of zero. */
break;
default:
abort (); /* No other kinds of rtx should be possible here. */
}
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
/* Generate *either* an AT_location attribute or else an AT_const_value
data attribute for a variable or a parameter. We generate the
AT_const_value attribute only in those cases where the given
variable or parameter does not have a true "location" either in
memory or in a register. This can happen (for example) when a
constant is passed as an actual argument in a call to an inline
function. (It's possible that these things can crop up in other
ways also.) Note that one type of constant value which can be
passed into an inlined function is a constant pointer. This can
happen for example if an actual argument in an inlined function
call evaluates to a compile-time constant address. */
static void
location_or_const_value_attribute (decl)
register tree decl;
{
register rtx rtl;
if (TREE_CODE (decl) == ERROR_MARK)
return;
if ((TREE_CODE (decl) != VAR_DECL) && (TREE_CODE (decl) != PARM_DECL))
{
/* Should never happen. */
abort ();
return;
}
/* Here we have to decide where we are going to say the parameter "lives"
(as far as the debugger is concerned). We only have a couple of choices.
GCC provides us with DECL_RTL and with DECL_INCOMING_RTL. DECL_RTL
normally indicates where the parameter lives during most of the activa-
tion of the function. If optimization is enabled however, this could
be either NULL or else a pseudo-reg. Both of those cases indicate that
the parameter doesn't really live anywhere (as far as the code generation
parts of GCC are concerned) during most of the function's activation.
That will happen (for example) if the parameter is never referenced
within the function.
We could just generate a location descriptor here for all non-NULL
non-pseudo values of DECL_RTL and ignore all of the rest, but we can
be a little nicer than that if we also consider DECL_INCOMING_RTL in
cases where DECL_RTL is NULL or is a pseudo-reg.
Note however that we can only get away with using DECL_INCOMING_RTL as
a backup substitute for DECL_RTL in certain limited cases. In cases
where DECL_ARG_TYPE(decl) indicates the same type as TREE_TYPE(decl)
we can be sure that the parameter was passed using the same type as it
is declared to have within the function, and that its DECL_INCOMING_RTL
points us to a place where a value of that type is passed. In cases
where DECL_ARG_TYPE(decl) and TREE_TYPE(decl) are different types
however, we cannot (in general) use DECL_INCOMING_RTL as a backup
substitute for DECL_RTL because in these cases, DECL_INCOMING_RTL
points us to a value of some type which is *different* from the type
of the parameter itself. Thus, if we tried to use DECL_INCOMING_RTL
to generate a location attribute in such cases, the debugger would
end up (for example) trying to fetch a `float' from a place which
actually contains the first part of a `double'. That would lead to
really incorrect and confusing output at debug-time, and we don't
want that now do we?
So in general, we DO NOT use DECL_INCOMING_RTL as a backup for DECL_RTL
in cases where DECL_ARG_TYPE(decl) != TREE_TYPE(decl). There are a
couple of cute exceptions however. On little-endian machines we can
get away with using DECL_INCOMING_RTL even when DECL_ARG_TYPE(decl) is
not the same as TREE_TYPE(decl) but only when DECL_ARG_TYPE(decl) is
an integral type which is smaller than TREE_TYPE(decl). These cases
arise when (on a little-endian machine) a non-prototyped function has
a parameter declared to be of type `short' or `char'. In such cases,
TREE_TYPE(decl) will be `short' or `char', DECL_ARG_TYPE(decl) will be
`int', and DECL_INCOMING_RTL will point to the lowest-order byte of the
passed `int' value. If the debugger then uses that address to fetch a
`short' or a `char' (on a little-endian machine) the result will be the
correct data, so we allow for such exceptional cases below.
Note that our goal here is to describe the place where the given formal
parameter lives during most of the function's activation (i.e. between
the end of the prologue and the start of the epilogue). We'll do that
as best as we can. Note however that if the given formal parameter is
modified sometime during the execution of the function, then a stack
backtrace (at debug-time) will show the function as having been called
with the *new* value rather than the value which was originally passed
in. This happens rarely enough that it is not a major problem, but it
*is* a problem, and I'd like to fix it. A future version of dwarfout.c
may generate two additional attributes for any given TAG_formal_parameter
DIE which will describe the "passed type" and the "passed location" for
the given formal parameter in addition to the attributes we now generate
to indicate the "declared type" and the "active location" for each
parameter. This additional set of attributes could be used by debuggers
for stack backtraces.
Separately, note that sometimes DECL_RTL can be NULL and DECL_INCOMING_RTL
can be NULL also. This happens (for example) for inlined-instances of
inline function formal parameters which are never referenced. This really
shouldn't be happening. All PARM_DECL nodes should get valid non-NULL
DECL_INCOMING_RTL values, but integrate.c doesn't currently generate
these values for inlined instances of inline function parameters, so
when we see such cases, we are just out-of-luck for the time
being (until integrate.c gets fixed).
*/
/* Use DECL_RTL as the "location" unless we find something better. */
rtl = DECL_RTL (decl);
if (TREE_CODE (decl) == PARM_DECL)
if (rtl == NULL_RTX || is_pseudo_reg (rtl))
{
/* This decl represents a formal parameter which was optimized out. */
register tree declared_type = type_main_variant (TREE_TYPE (decl));
register tree passed_type = type_main_variant (DECL_ARG_TYPE (decl));
/* Note that DECL_INCOMING_RTL may be NULL in here, but we handle
*all* cases where (rtl == NULL_RTX) just below. */
if (declared_type == passed_type)
rtl = DECL_INCOMING_RTL (decl);
else if (! BYTES_BIG_ENDIAN)
if (TREE_CODE (declared_type) == INTEGER_TYPE)
if (TYPE_SIZE (declared_type) <= TYPE_SIZE (passed_type))
rtl = DECL_INCOMING_RTL (decl);
}
if (rtl == NULL_RTX)
return;
rtl = eliminate_regs (rtl, 0, NULL_RTX);
#ifdef LEAF_REG_REMAP
if (leaf_function)
leaf_renumber_regs_insn (rtl);
#endif
switch (GET_CODE (rtl))
{
case ADDRESSOF:
/* The address of a variable that was optimized away; don't emit
anything. */
break;
case CONST_INT:
case CONST_DOUBLE:
case CONST_STRING:
case SYMBOL_REF:
case LABEL_REF:
case CONST:
case PLUS: /* DECL_RTL could be (plus (reg ...) (const_int ...)) */
const_value_attribute (rtl);
break;
case MEM:
case REG:
case SUBREG:
location_attribute (rtl);
break;
case CONCAT:
/* ??? CONCAT is used for complex variables, which may have the real
part stored in one place and the imag part stored somewhere else.
DWARF1 has no way to describe a variable that lives in two different
places, so we just describe where the first part lives, and hope that
the second part is stored after it. */
location_attribute (XEXP (rtl, 0));
break;
default:
abort (); /* Should never happen. */
}
}
/* Generate an AT_name attribute given some string value to be included as
the value of the attribute. */
static inline void
name_attribute (name_string)
register char *name_string;
{
if (name_string && *name_string)
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_name);
ASM_OUTPUT_DWARF_STRING (asm_out_file, name_string);
}
}
static inline void
fund_type_attribute (ft_code)
register unsigned ft_code;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_fund_type);
ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, ft_code);
}
static void
mod_fund_type_attribute (type, decl_const, decl_volatile)
register tree type;
register int decl_const;
register int decl_volatile;
{
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mod_fund_type);
sprintf (begin_label, MT_BEGIN_LABEL_FMT, current_dienum);
sprintf (end_label, MT_END_LABEL_FMT, current_dienum);
ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
write_modifier_bytes (type, decl_const, decl_volatile);
ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file,
fundamental_type_code (root_type (type)));
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
static inline void
user_def_type_attribute (type)
register tree type;
{
char ud_type_name[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_user_def_type);
sprintf (ud_type_name, TYPE_NAME_FMT, TYPE_UID (type));
ASM_OUTPUT_DWARF_REF (asm_out_file, ud_type_name);
}
static void
mod_u_d_type_attribute (type, decl_const, decl_volatile)
register tree type;
register int decl_const;
register int decl_volatile;
{
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
char ud_type_name[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mod_u_d_type);
sprintf (begin_label, MT_BEGIN_LABEL_FMT, current_dienum);
sprintf (end_label, MT_END_LABEL_FMT, current_dienum);
ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
write_modifier_bytes (type, decl_const, decl_volatile);
sprintf (ud_type_name, TYPE_NAME_FMT, TYPE_UID (root_type (type)));
ASM_OUTPUT_DWARF_REF (asm_out_file, ud_type_name);
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
#ifdef USE_ORDERING_ATTRIBUTE
static inline void
ordering_attribute (ordering)
register unsigned ordering;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_ordering);
ASM_OUTPUT_DWARF_DATA2 (asm_out_file, ordering);
}
#endif /* defined(USE_ORDERING_ATTRIBUTE) */
/* Note that the block of subscript information for an array type also
includes information about the element type of type given array type. */
static void
subscript_data_attribute (type)
register tree type;
{
register unsigned dimension_number;
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_subscr_data);
sprintf (begin_label, SS_BEGIN_LABEL_FMT, current_dienum);
sprintf (end_label, SS_END_LABEL_FMT, current_dienum);
ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
/* The GNU compilers represent multidimensional array types as sequences
of one dimensional array types whose element types are themselves array
types. Here we squish that down, so that each multidimensional array
type gets only one array_type DIE in the Dwarf debugging info. The
draft Dwarf specification say that we are allowed to do this kind
of compression in C (because there is no difference between an
array or arrays and a multidimensional array in C) but for other
source languages (e.g. Ada) we probably shouldn't do this. */
for (dimension_number = 0;
TREE_CODE (type) == ARRAY_TYPE;
type = TREE_TYPE (type), dimension_number++)
{
register tree domain = TYPE_DOMAIN (type);
/* Arrays come in three flavors. Unspecified bounds, fixed
bounds, and (in GNU C only) variable bounds. Handle all
three forms here. */
if (domain)
{
/* We have an array type with specified bounds. */
register tree lower = TYPE_MIN_VALUE (domain);
register tree upper = TYPE_MAX_VALUE (domain);
/* Handle only fundamental types as index types for now. */
if (! type_is_fundamental (domain))
abort ();
/* Output the representation format byte for this dimension. */
ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file,
FMT_CODE (1, TREE_CODE (lower) == INTEGER_CST,
(upper && TREE_CODE (upper) == INTEGER_CST)));
/* Output the index type for this dimension. */
ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file,
fundamental_type_code (domain));
/* Output the representation for the lower bound. */
output_bound_representation (lower, dimension_number, 'l');
/* Output the representation for the upper bound. */
output_bound_representation (upper, dimension_number, 'u');
}
else
{
/* We have an array type with an unspecified length. For C and
C++ we can assume that this really means that (a) the index
type is an integral type, and (b) the lower bound is zero.
Note that Dwarf defines the representation of an unspecified
(upper) bound as being a zero-length location description. */
/* Output the array-bounds format byte. */
ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, FMT_FT_C_X);
/* Output the (assumed) index type. */
ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, FT_integer);
/* Output the (assumed) lower bound (constant) value. */
ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
/* Output the (empty) location description for the upper bound. */
ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0);
}
}
/* Output the prefix byte that says that the element type is coming up. */
ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, FMT_ET);
/* Output a representation of the type of the elements of this array type. */
type_attribute (type, 0, 0);
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
static void
byte_size_attribute (tree_node)
register tree tree_node;
{
register unsigned size;
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_byte_size);
switch (TREE_CODE (tree_node))
{
case ERROR_MARK:
size = 0;
break;
case ENUMERAL_TYPE:
case RECORD_TYPE:
case UNION_TYPE:
case QUAL_UNION_TYPE:
case ARRAY_TYPE:
size = int_size_in_bytes (tree_node);
break;
case FIELD_DECL:
/* For a data member of a struct or union, the AT_byte_size is
generally given as the number of bytes normally allocated for
an object of the *declared* type of the member itself. This
is true even for bit-fields. */
size = simple_type_size_in_bits (field_type (tree_node))
/ BITS_PER_UNIT;
break;
default:
abort ();
}
/* Note that `size' might be -1 when we get to this point. If it
is, that indicates that the byte size of the entity in question
is variable. We have no good way of expressing this fact in Dwarf
at the present time, so just let the -1 pass on through. */
ASM_OUTPUT_DWARF_DATA4 (asm_out_file, size);
}
/* For a FIELD_DECL node which represents a bit-field, output an attribute
which specifies the distance in bits from the highest order bit of the
"containing object" for the bit-field to the highest order bit of the
bit-field itself.
For any given bit-field, the "containing object" is a hypothetical
object (of some integral or enum type) within which the given bit-field
lives. The type of this hypothetical "containing object" is always the
same as the declared type of the individual bit-field itself.
The determination of the exact location of the "containing object" for
a bit-field is rather complicated. It's handled by the `field_byte_offset'
function (above).
Note that it is the size (in bytes) of the hypothetical "containing
object" which will be given in the AT_byte_size attribute for this
bit-field. (See `byte_size_attribute' above.) */
static inline void
bit_offset_attribute (decl)
register tree decl;
{
register unsigned object_offset_in_bytes = field_byte_offset (decl);
register tree type = DECL_BIT_FIELD_TYPE (decl);
register tree bitpos_tree = DECL_FIELD_BITPOS (decl);
register unsigned bitpos_int;
register unsigned highest_order_object_bit_offset;
register unsigned highest_order_field_bit_offset;
register unsigned bit_offset;
/* Must be a bit field. */
if (!type
|| TREE_CODE (decl) != FIELD_DECL)
abort ();
/* We can't yet handle bit-fields whose offsets are variable, so if we
encounter such things, just return without generating any attribute
whatsoever. */
if (TREE_CODE (bitpos_tree) != INTEGER_CST)
return;
bitpos_int = (unsigned) TREE_INT_CST_LOW (bitpos_tree);
/* Note that the bit offset is always the distance (in bits) from the
highest-order bit of the "containing object" to the highest-order
bit of the bit-field itself. Since the "high-order end" of any
object or field is different on big-endian and little-endian machines,
the computation below must take account of these differences. */
highest_order_object_bit_offset = object_offset_in_bytes * BITS_PER_UNIT;
highest_order_field_bit_offset = bitpos_int;
if (! BYTES_BIG_ENDIAN)
{
highest_order_field_bit_offset
+= (unsigned) TREE_INT_CST_LOW (DECL_SIZE (decl));
highest_order_object_bit_offset += simple_type_size_in_bits (type);
}
bit_offset =
(! BYTES_BIG_ENDIAN
? highest_order_object_bit_offset - highest_order_field_bit_offset
: highest_order_field_bit_offset - highest_order_object_bit_offset);
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_bit_offset);
ASM_OUTPUT_DWARF_DATA2 (asm_out_file, bit_offset);
}
/* For a FIELD_DECL node which represents a bit field, output an attribute
which specifies the length in bits of the given field. */
static inline void
bit_size_attribute (decl)
register tree decl;
{
/* Must be a field and a bit field. */
if (TREE_CODE (decl) != FIELD_DECL
|| ! DECL_BIT_FIELD_TYPE (decl))
abort ();
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_bit_size);
ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
(unsigned) TREE_INT_CST_LOW (DECL_SIZE (decl)));
}
/* The following routine outputs the `element_list' attribute for enumeration
type DIEs. The element_lits attribute includes the names and values of
all of the enumeration constants associated with the given enumeration
type. */
static inline void
element_list_attribute (element)
register tree element;
{
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_element_list);
sprintf (begin_label, EE_BEGIN_LABEL_FMT, current_dienum);
sprintf (end_label, EE_END_LABEL_FMT, current_dienum);
ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
/* Here we output a list of value/name pairs for each enumeration constant
defined for this enumeration type (as required), but we do it in REVERSE
order. The order is the one required by the draft #5 Dwarf specification
published by the UI/PLSIG. */
output_enumeral_list (element); /* Recursively output the whole list. */
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
/* Generate an AT_stmt_list attribute. These are normally present only in
DIEs with a TAG_compile_unit tag. */
static inline void
stmt_list_attribute (label)
register char *label;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_stmt_list);
/* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
ASM_OUTPUT_DWARF_ADDR (asm_out_file, label);
}
/* Generate an AT_low_pc attribute for a label DIE, a lexical_block DIE or
for a subroutine DIE. */
static inline void
low_pc_attribute (asm_low_label)
register char *asm_low_label;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_low_pc);
ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_low_label);
}
/* Generate an AT_high_pc attribute for a lexical_block DIE or for a
subroutine DIE. */
static inline void
high_pc_attribute (asm_high_label)
register char *asm_high_label;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_high_pc);
ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_high_label);
}
/* Generate an AT_body_begin attribute for a subroutine DIE. */
static inline void
body_begin_attribute (asm_begin_label)
register char *asm_begin_label;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_body_begin);
ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_begin_label);
}
/* Generate an AT_body_end attribute for a subroutine DIE. */
static inline void
body_end_attribute (asm_end_label)
register char *asm_end_label;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_body_end);
ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_end_label);
}
/* Generate an AT_language attribute given a LANG value. These attributes
are used only within TAG_compile_unit DIEs. */
static inline void
language_attribute (language_code)
register unsigned language_code;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_language);
ASM_OUTPUT_DWARF_DATA4 (asm_out_file, language_code);
}
static inline void
member_attribute (context)
register tree context;
{
char label[MAX_ARTIFICIAL_LABEL_BYTES];
/* Generate this attribute only for members in C++. */
if (context != NULL && is_tagged_type (context))
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_member);
sprintf (label, TYPE_NAME_FMT, TYPE_UID (context));
ASM_OUTPUT_DWARF_REF (asm_out_file, label);
}
}
#if 0
static inline void
string_length_attribute (upper_bound)
register tree upper_bound;
{
char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_string_length);
sprintf (begin_label, SL_BEGIN_LABEL_FMT, current_dienum);
sprintf (end_label, SL_END_LABEL_FMT, current_dienum);
ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
ASM_OUTPUT_LABEL (asm_out_file, begin_label);
output_bound_representation (upper_bound, 0, 'u');
ASM_OUTPUT_LABEL (asm_out_file, end_label);
}
#endif
static inline void
comp_dir_attribute (dirname)
register char *dirname;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_comp_dir);
ASM_OUTPUT_DWARF_STRING (asm_out_file, dirname);
}
static inline void
sf_names_attribute (sf_names_start_label)
register char *sf_names_start_label;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_sf_names);
/* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
ASM_OUTPUT_DWARF_ADDR (asm_out_file, sf_names_start_label);
}
static inline void
src_info_attribute (src_info_start_label)
register char *src_info_start_label;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_src_info);
/* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
ASM_OUTPUT_DWARF_ADDR (asm_out_file, src_info_start_label);
}
static inline void
mac_info_attribute (mac_info_start_label)
register char *mac_info_start_label;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mac_info);
/* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
ASM_OUTPUT_DWARF_ADDR (asm_out_file, mac_info_start_label);
}
static inline void
prototyped_attribute (func_type)
register tree func_type;
{
if ((strcmp (language_string, "GNU C") == 0)
&& (TYPE_ARG_TYPES (func_type) != NULL))
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_prototyped);
ASM_OUTPUT_DWARF_STRING (asm_out_file, "");
}
}
static inline void
producer_attribute (producer)
register char *producer;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_producer);
ASM_OUTPUT_DWARF_STRING (asm_out_file, producer);
}
static inline void
inline_attribute (decl)
register tree decl;
{
if (DECL_INLINE (decl))
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_inline);
ASM_OUTPUT_DWARF_STRING (asm_out_file, "");
}
}
static inline void
containing_type_attribute (containing_type)
register tree containing_type;
{
char label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_containing_type);
sprintf (label, TYPE_NAME_FMT, TYPE_UID (containing_type));
ASM_OUTPUT_DWARF_REF (asm_out_file, label);
}
static inline void
abstract_origin_attribute (origin)
register tree origin;
{
char label[MAX_ARTIFICIAL_LABEL_BYTES];
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_abstract_origin);
switch (TREE_CODE_CLASS (TREE_CODE (origin)))
{
case 'd':
sprintf (label, DECL_NAME_FMT, DECL_UID (origin));
break;
case 't':
sprintf (label, TYPE_NAME_FMT, TYPE_UID (origin));
break;
default:
abort (); /* Should never happen. */
}
ASM_OUTPUT_DWARF_REF (asm_out_file, label);
}
#ifdef DWARF_DECL_COORDINATES
static inline void
src_coords_attribute (src_fileno, src_lineno)
register unsigned src_fileno;
register unsigned src_lineno;
{
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_src_coords);
ASM_OUTPUT_DWARF_DATA2 (asm_out_file, src_fileno);
ASM_OUTPUT_DWARF_DATA2 (asm_out_file, src_lineno);
}
#endif /* defined(DWARF_DECL_COORDINATES) */
static inline void
pure_or_virtual_attribute (func_decl)
register tree func_decl;
{
if (DECL_VIRTUAL_P (func_decl))
{
#if 0 /* DECL_ABSTRACT_VIRTUAL_P is C++-specific. */
if (DECL_ABSTRACT_VIRTUAL_P (func_decl))
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_pure_virtual);
else
#endif
ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_virtual);
ASM_OUTPUT_DWARF_STRING (asm_out_file, "");
}
}
/************************* end of attributes *****************************/
/********************* utility routines for DIEs *************************/
/* Output an AT_name attribute and an AT_src_coords attribute for the
given decl, but only if it actually has a name. */
static void
name_and_src_coords_attributes (decl)
register tree decl;
{
register tree decl_name = DECL_NAME (decl);
if (decl_name && IDENTIFIER_POINTER (decl_name))
{
name_attribute (IDENTIFIER_POINTER (decl_name));
#ifdef DWARF_DECL_COORDINATES
{
register unsigned file_index;
/* This is annoying, but we have to pop out of the .debug section
for a moment while we call `lookup_filename' because calling it
may cause a temporary switch into the .debug_sfnames section and
most svr4 assemblers are not smart enough to be able to nest
section switches to any depth greater than one. Note that we
also can't skirt this issue by delaying all output to the
.debug_sfnames section unit the end of compilation because that
would cause us to have inter-section forward references and
Fred Fish sez that m68k/svr4 assemblers botch those. */
ASM_OUTPUT_POP_SECTION (asm_out_file);
file_index = lookup_filename (DECL_SOURCE_FILE (decl));
ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
src_coords_attribute (file_index, DECL_SOURCE_LINE (decl));
}
#endif /* defined(DWARF_DECL_COORDINATES) */
}
}
/* Many forms of DIEs contain a "type description" part. The following
routine writes out these "type descriptor" parts. */
static void
type_attribute (type, decl_const, decl_volatile)
register tree type;
register int decl_const;
register int decl_volatile;
{
register enum tree_code code = TREE_CODE (type);
register int root_type_modified;
if (code == ERROR_MARK)
return;
/* Handle a special case. For functions whose return type is void,
we generate *no* type attribute. (Note that no object may have
type `void', so this only applies to function return types. */
if (code == VOID_TYPE)
return;
/* If this is a subtype, find the underlying type. Eventually,
this should write out the appropriate subtype info. */
while ((code == INTEGER_TYPE || code == REAL_TYPE)
&& TREE_TYPE (type) != 0)
type = TREE_TYPE (type), code = TREE_CODE (type);
root_type_modified = (code == POINTER_TYPE || code == REFERENCE_TYPE
|| decl_const || decl_volatile
|| TYPE_READONLY (type) || TYPE_VOLATILE (type));
if (type_is_fundamental (root_type (type)))
{
if (root_type_modified)
mod_fund_type_attribute (type, decl_const, decl_volatile);
else
fund_type_attribute (fundamental_type_code (type));
}
else
{
if (root_type_modified)
mod_u_d_type_attribute (type, decl_const, decl_volatile);
else
/* We have to get the type_main_variant here (and pass that to the
`user_def_type_attribute' routine) because the ..._TYPE node we
have might simply be a *copy* of some original type node (where
the copy was created to help us keep track of typedef names)
and that copy might have a different TYPE_UID from the original
..._TYPE node. (Note that when `equate_type_number_to_die_number'
is labeling a given type DIE for future reference, it always and
only creates labels for DIEs representing *main variants*, and it
never even knows about non-main-variants.) */
user_def_type_attribute (type_main_variant (type));
}
}
/* Given a tree pointer to a struct, class, union, or enum type node, return
a pointer to the (string) tag name for the given type, or zero if the
type was declared without a tag. */
static char *
type_tag (type)
register tree type;
{
register char *name = 0;
if (TYPE_NAME (type) != 0)
{
register tree t = 0;
/* Find the IDENTIFIER_NODE for the type name. */
if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
t = TYPE_NAME (type);
/* The g++ front end makes the TYPE_NAME of *each* tagged type point to
a TYPE_DECL node, regardless of whether or not a `typedef' was
involved. */
else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& ! DECL_IGNORED_P (TYPE_NAME (type)))
t = DECL_NAME (TYPE_NAME (type));
/* Now get the name as a string, or invent one. */
if (t != 0)
name = IDENTIFIER_POINTER (t);
}
return (name == 0 || *name == '\0') ? 0 : name;
}
static inline void
dienum_push ()
{
/* Start by checking if the pending_sibling_stack needs to be expanded.
If necessary, expand it. */
if (pending_siblings == pending_siblings_allocated)
{
pending_siblings_allocated += PENDING_SIBLINGS_INCREMENT;
pending_sibling_stack
= (unsigned *) xrealloc (pending_sibling_stack,
pending_siblings_allocated * sizeof(unsigned));
}
pending_siblings++;
NEXT_DIE_NUM = next_unused_dienum++;
}
/* Pop the sibling stack so that the most recently pushed DIEnum becomes the
NEXT_DIE_NUM. */
static inline void
dienum_pop ()
{
pending_siblings--;
}
static inline tree
member_declared_type (member)
register tree member;
{
return (DECL_BIT_FIELD_TYPE (member))
? DECL_BIT_FIELD_TYPE (member)
: TREE_TYPE (member);
}
/* Get the function's label, as described by its RTL.
This may be different from the DECL_NAME name used
in the source file. */
static char *
function_start_label (decl)
register tree decl;
{
rtx x;
char *fnname;
x = DECL_RTL (decl);
if (GET_CODE (x) != MEM)
abort ();
x = XEXP (x, 0);
if (GET_CODE (x) != SYMBOL_REF)
abort ();
fnname = XSTR (x, 0);
return fnname;
}
/******************************* DIEs ************************************/
/* Output routines for individual types of DIEs. */
/* Note that every type of DIE (except a null DIE) gets a sibling. */
static void
output_array_type_die (arg)
register void *arg;
{
register tree type = arg;
ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_array_type);
sibling_attribute ();
equate_type_number_to_die_number (type);
member_attribute (TYPE_CONTEXT (type));
/* I believe that we can default the array ordering. SDB will probably
do the right things even if AT_ordering is not present. It's not
even an issue until we start to get into multidimensional arrays
anyway. If SDB is ever caught doing the Wrong Thing for multi-
dimensional arrays, then we'll have to put the AT_ordering attribute
back in. (But if and when we find out that we need to put these in,
we will only do so for multidimensional arrays. After all, we don't
want to waste space in the .debug section now do we?) */
#ifdef USE_ORDERING_ATTRIBUTE
ordering_attribute (ORD_row_major);
#endif /* defined(USE_ORDERING_ATTRIBUTE) */
subscript_data_attribute (type);
}
static void
output_set_type_die (arg)
register void *arg;
{
register tree type = arg;
ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_set_type);
sibling_attribute ();
equate_type_number_to_die_number (type);
member_attribute (TYPE_CONTEXT (type));
type_attribute (TREE_TYPE (type), 0, 0);
}
#if 0
/* Implement this when there is a GNU FORTRAN or GNU Ada front end. */
static void
output_entry_point_die (arg)
register void *arg;
{
register tree decl = arg;
register tree origin = decl_ultimate_origin (decl);
ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_entry_point);
sibling_attribute ();
dienum_push ();
if (origin != NULL)
abstract_origin_attribute (origin);
else
{
name_and_src_coords_attributes (decl);
member_attribute (DECL_CONTEXT (decl));
type_attribute (TREE_TYPE (TREE_TYPE (decl)), 0, 0);
}
if (DECL_ABSTRACT (decl))
equate_decl_number_to_die_number (decl);
else
low_pc_attribute (function_start_label (decl));
}
#endif
/* Output a DIE to represent an inlined instance of an enumeration type. */
static void
output_inlined_enumeration_type_die (arg)
register void *arg;
{
register tree type = arg;
ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_enumeration_type);
sibling_attribute ();
if (!TREE_ASM_WRITTEN (type))
abort ();
abstract_origin_attribute (type);
}
/* Output a DIE to represent an inlined instance of a structure type. */
static void
output_inlined_structure_type_die (arg)
register void *arg;
{
register tree type = arg;
ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_structure_type);
sibling_attribute ();
if (!TREE_ASM_WRITTEN (type))
abort ();
abstract_origin_attribute (type);
}
/* Output a DIE to represent an inlined instance of a union type. */
static void
output_inlined_union_type_die (arg)
register void *arg;
{
register tree type = arg;
ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_union_type);
sibling_attribute ();
if (!TREE_ASM_WRITTEN (type))
abort ();
abstract_origin_attribute (type);
}
/* Output a DIE to represent an enumeration type. Note that these DIEs
include all of the information about the enumeration values also.
This information is encoded into the element_list attribute. */
static void
output_enumeration_type_die (arg)
register void *arg;
{
register tree type = arg;
ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_enumeration_type);
sibling_attribute ();
equate_type_number_to_die_number (type);
name_attribute (type_tag (type));
member_attribute (TYPE_CONTEXT (type));
/* Handle a GNU C/C++ extension, i.e. incomplete enum types. If the
given enum type is incomplete, do not generate the AT_byte_size
attribute or the AT_element_list attribute. */