| /* Read dbx symbol tables and convert to internal format, for GDB. |
| Copyright (C) 1986-2024 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| /* This module provides three functions: dbx_symfile_init, |
| which initializes to read a symbol file; dbx_new_init, which |
| discards existing cached information when all symbols are being |
| discarded; and dbx_symfile_read, which reads a symbol table |
| from a file. |
| |
| dbx_symfile_read only does the minimum work necessary for letting the |
| user "name" things symbolically; it does not read the entire symtab. |
| Instead, it reads the external and static symbols and puts them in partial |
| symbol tables. When more extensive information is requested of a |
| file, the corresponding partial symbol table is mutated into a full |
| fledged symbol table by going back and reading the symbols |
| for real. dbx_psymtab_to_symtab() is the function that does this */ |
| |
| |
| #include "event-top.h" |
| #include "gdbsupport/gdb_obstack.h" |
| #include <sys/stat.h> |
| #include "symtab.h" |
| #include "breakpoint.h" |
| #include "target.h" |
| #include "gdbcore.h" |
| #include "libaout.h" |
| #include "filenames.h" |
| #include "objfiles.h" |
| #include "buildsym-legacy.h" |
| #include "stabsread.h" |
| #include "gdb-stabs.h" |
| #include "demangle.h" |
| #include "complaints.h" |
| #include "cp-abi.h" |
| #include "cp-support.h" |
| #include "c-lang.h" |
| #include "psymtab.h" |
| #include "block.h" |
| #include "aout/aout64.h" |
| #include "aout/stab_gnu.h" |
| |
| |
| /* Key for dbx-associated data. */ |
| |
| const registry<objfile>::key<dbx_symfile_info> dbx_objfile_data_key; |
| |
| /* We put a pointer to this structure in the read_symtab_private field |
| of the psymtab. */ |
| |
| struct symloc |
| { |
| /* Offset within the file symbol table of first local symbol for this |
| file. */ |
| |
| int ldsymoff; |
| |
| /* Length (in bytes) of the section of the symbol table devoted to |
| this file's symbols (actually, the section bracketed may contain |
| more than just this file's symbols). If ldsymlen is 0, the only |
| reason for this thing's existence is the dependency list. Nothing |
| else will happen when it is read in. */ |
| |
| int ldsymlen; |
| |
| /* The size of each symbol in the symbol file (in external form). */ |
| |
| int symbol_size; |
| |
| /* Further information needed to locate the symbols if they are in |
| an ELF file. */ |
| |
| int symbol_offset; |
| int string_offset; |
| int file_string_offset; |
| enum language pst_language; |
| }; |
| |
| #define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff) |
| #define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen) |
| #define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private)) |
| #define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size) |
| #define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset) |
| #define STRING_OFFSET(p) (SYMLOC(p)->string_offset) |
| #define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset) |
| #define PST_LANGUAGE(p) (SYMLOC(p)->pst_language) |
| |
| |
| /* The objfile we are currently reading. */ |
| |
| static struct objfile *dbxread_objfile; |
| |
| /* Remember what we deduced to be the source language of this psymtab. */ |
| |
| static enum language psymtab_language = language_unknown; |
| |
| /* The BFD for this file -- implicit parameter to next_symbol_text. */ |
| |
| static bfd *symfile_bfd; |
| |
| /* The size of each symbol in the symbol file (in external form). |
| This is set by dbx_symfile_read when building psymtabs, and by |
| dbx_psymtab_to_symtab when building symtabs. */ |
| |
| static unsigned symbol_size; |
| |
| /* This is the offset of the symbol table in the executable file. */ |
| |
| static unsigned symbol_table_offset; |
| |
| /* This is the offset of the string table in the executable file. */ |
| |
| static unsigned string_table_offset; |
| |
| /* For elf+stab executables, the n_strx field is not a simple index |
| into the string table. Instead, each .o file has a base offset in |
| the string table, and the associated symbols contain offsets from |
| this base. The following two variables contain the base offset for |
| the current and next .o files. */ |
| |
| static unsigned int file_string_table_offset; |
| static unsigned int next_file_string_table_offset; |
| |
| /* .o and NLM files contain unrelocated addresses which are based at |
| 0. When non-zero, this flag disables some of the special cases for |
| Solaris elf+stab text addresses at location 0. */ |
| |
| static int symfile_relocatable = 0; |
| |
| /* When set, we are processing a .o file compiled by sun acc. This is |
| misnamed; it refers to all stabs-in-elf implementations which use |
| N_UNDF the way Sun does, including Solaris gcc. Hopefully all |
| stabs-in-elf implementations ever invented will choose to be |
| compatible. */ |
| |
| static unsigned char processing_acc_compilation; |
| |
| |
| /* The lowest text address we have yet encountered. This is needed |
| because in an a.out file, there is no header field which tells us |
| what address the program is actually going to be loaded at, so we |
| need to make guesses based on the symbols (which *are* relocated to |
| reflect the address it will be loaded at). */ |
| |
| static unrelocated_addr lowest_text_address; |
| |
| /* Non-zero if there is any line number info in the objfile. Prevents |
| dbx_end_psymtab from discarding an otherwise empty psymtab. */ |
| |
| static int has_line_numbers; |
| |
| /* Complaints about the symbols we have encountered. */ |
| |
| static void |
| unknown_symtype_complaint (const char *arg1) |
| { |
| complaint (_("unknown symbol type %s"), arg1); |
| } |
| |
| static void |
| lbrac_mismatch_complaint (int arg1) |
| { |
| complaint (_("N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d"), arg1); |
| } |
| |
| static void |
| repeated_header_complaint (const char *arg1, int arg2) |
| { |
| complaint (_("\"repeated\" header file %s not " |
| "previously seen, at symtab pos %d"), |
| arg1, arg2); |
| } |
| |
| /* find_text_range --- find start and end of loadable code sections |
| |
| The find_text_range function finds the shortest address range that |
| encloses all sections containing executable code, and stores it in |
| objfile's text_addr and text_size members. |
| |
| dbx_symfile_read will use this to finish off the partial symbol |
| table, in some cases. */ |
| |
| static void |
| find_text_range (bfd * sym_bfd, struct objfile *objfile) |
| { |
| asection *sec; |
| int found_any = 0; |
| CORE_ADDR start = 0; |
| CORE_ADDR end = 0; |
| |
| for (sec = sym_bfd->sections; sec; sec = sec->next) |
| if (bfd_section_flags (sec) & SEC_CODE) |
| { |
| CORE_ADDR sec_start = bfd_section_vma (sec); |
| CORE_ADDR sec_end = sec_start + bfd_section_size (sec); |
| |
| if (found_any) |
| { |
| if (sec_start < start) |
| start = sec_start; |
| if (sec_end > end) |
| end = sec_end; |
| } |
| else |
| { |
| start = sec_start; |
| end = sec_end; |
| } |
| |
| found_any = 1; |
| } |
| |
| if (!found_any) |
| error (_("Can't find any code sections in symbol file")); |
| |
| DBX_TEXT_ADDR (objfile) = start; |
| DBX_TEXT_SIZE (objfile) = end - start; |
| } |
| |
| |
| |
| /* During initial symbol readin, we need to have a structure to keep |
| track of which psymtabs have which bincls in them. This structure |
| is used during readin to setup the list of dependencies within each |
| partial symbol table. */ |
| |
| struct header_file_location |
| { |
| header_file_location (const char *name_, int instance_, |
| legacy_psymtab *pst_) |
| : name (name_), |
| instance (instance_), |
| pst (pst_) |
| { |
| } |
| |
| const char *name; /* Name of header file */ |
| int instance; /* See above */ |
| legacy_psymtab *pst; /* Partial symtab that has the |
| BINCL/EINCL defs for this file. */ |
| }; |
| |
| /* The list of bincls. */ |
| static std::vector<struct header_file_location> *bincl_list; |
| |
| /* Local function prototypes. */ |
| |
| static void read_ofile_symtab (struct objfile *, legacy_psymtab *); |
| |
| static void dbx_read_symtab (legacy_psymtab *self, |
| struct objfile *objfile); |
| |
| static void dbx_expand_psymtab (legacy_psymtab *, struct objfile *); |
| |
| static void read_dbx_symtab (minimal_symbol_reader &, psymtab_storage *, |
| struct objfile *); |
| |
| static legacy_psymtab *find_corresponding_bincl_psymtab (const char *, |
| int); |
| |
| static const char *dbx_next_symbol_text (struct objfile *); |
| |
| static void fill_symbuf (bfd *); |
| |
| static void dbx_symfile_init (struct objfile *); |
| |
| static void dbx_new_init (struct objfile *); |
| |
| static void dbx_symfile_read (struct objfile *, symfile_add_flags); |
| |
| static void dbx_symfile_finish (struct objfile *); |
| |
| static void record_minimal_symbol (minimal_symbol_reader &, |
| const char *, unrelocated_addr, int, |
| struct objfile *); |
| |
| static void add_new_header_file (const char *, int); |
| |
| static void add_old_header_file (const char *, int); |
| |
| static void add_this_object_header_file (int); |
| |
| static legacy_psymtab *start_psymtab (psymtab_storage *, struct objfile *, |
| const char *, unrelocated_addr, int); |
| |
| /* Free up old header file tables. */ |
| |
| void |
| free_header_files (void) |
| { |
| if (this_object_header_files) |
| { |
| xfree (this_object_header_files); |
| this_object_header_files = NULL; |
| } |
| n_allocated_this_object_header_files = 0; |
| } |
| |
| /* Allocate new header file tables. */ |
| |
| void |
| init_header_files (void) |
| { |
| n_allocated_this_object_header_files = 10; |
| this_object_header_files = XNEWVEC (int, 10); |
| } |
| |
| /* Add header file number I for this object file |
| at the next successive FILENUM. */ |
| |
| static void |
| add_this_object_header_file (int i) |
| { |
| if (n_this_object_header_files == n_allocated_this_object_header_files) |
| { |
| n_allocated_this_object_header_files *= 2; |
| this_object_header_files |
| = (int *) xrealloc ((char *) this_object_header_files, |
| n_allocated_this_object_header_files * sizeof (int)); |
| } |
| |
| this_object_header_files[n_this_object_header_files++] = i; |
| } |
| |
| /* Add to this file an "old" header file, one already seen in |
| a previous object file. NAME is the header file's name. |
| INSTANCE is its instance code, to select among multiple |
| symbol tables for the same header file. */ |
| |
| static void |
| add_old_header_file (const char *name, int instance) |
| { |
| struct header_file *p = HEADER_FILES (dbxread_objfile); |
| int i; |
| |
| for (i = 0; i < N_HEADER_FILES (dbxread_objfile); i++) |
| if (filename_cmp (p[i].name, name) == 0 && instance == p[i].instance) |
| { |
| add_this_object_header_file (i); |
| return; |
| } |
| repeated_header_complaint (name, symnum); |
| } |
| |
| /* Add to this file a "new" header file: definitions for its types follow. |
| NAME is the header file's name. |
| Most often this happens only once for each distinct header file, |
| but not necessarily. If it happens more than once, INSTANCE has |
| a different value each time, and references to the header file |
| use INSTANCE values to select among them. |
| |
| dbx output contains "begin" and "end" markers for each new header file, |
| but at this level we just need to know which files there have been; |
| so we record the file when its "begin" is seen and ignore the "end". */ |
| |
| static void |
| add_new_header_file (const char *name, int instance) |
| { |
| int i; |
| struct header_file *hfile; |
| |
| /* Make sure there is room for one more header file. */ |
| |
| i = N_ALLOCATED_HEADER_FILES (dbxread_objfile); |
| |
| if (N_HEADER_FILES (dbxread_objfile) == i) |
| { |
| if (i == 0) |
| { |
| N_ALLOCATED_HEADER_FILES (dbxread_objfile) = 10; |
| HEADER_FILES (dbxread_objfile) = (struct header_file *) |
| xmalloc (10 * sizeof (struct header_file)); |
| } |
| else |
| { |
| i *= 2; |
| N_ALLOCATED_HEADER_FILES (dbxread_objfile) = i; |
| HEADER_FILES (dbxread_objfile) = (struct header_file *) |
| xrealloc ((char *) HEADER_FILES (dbxread_objfile), |
| (i * sizeof (struct header_file))); |
| } |
| } |
| |
| /* Create an entry for this header file. */ |
| |
| i = N_HEADER_FILES (dbxread_objfile)++; |
| hfile = HEADER_FILES (dbxread_objfile) + i; |
| hfile->name = xstrdup (name); |
| hfile->instance = instance; |
| hfile->length = 10; |
| hfile->vector = XCNEWVEC (struct type *, 10); |
| |
| add_this_object_header_file (i); |
| } |
| |
| #if 0 |
| static struct type ** |
| explicit_lookup_type (int real_filenum, int index) |
| { |
| struct header_file *f = &HEADER_FILES (dbxread_objfile)[real_filenum]; |
| |
| if (index >= f->length) |
| { |
| f->length *= 2; |
| f->vector = (struct type **) |
| xrealloc (f->vector, f->length * sizeof (struct type *)); |
| memset (&f->vector[f->length / 2], |
| '\0', f->length * sizeof (struct type *) / 2); |
| } |
| return &f->vector[index]; |
| } |
| #endif |
| |
| static void |
| record_minimal_symbol (minimal_symbol_reader &reader, |
| const char *name, unrelocated_addr address, int type, |
| struct objfile *objfile) |
| { |
| enum minimal_symbol_type ms_type; |
| int section; |
| |
| switch (type) |
| { |
| case N_TEXT | N_EXT: |
| ms_type = mst_text; |
| section = SECT_OFF_TEXT (objfile); |
| break; |
| case N_DATA | N_EXT: |
| ms_type = mst_data; |
| section = SECT_OFF_DATA (objfile); |
| break; |
| case N_BSS | N_EXT: |
| ms_type = mst_bss; |
| section = SECT_OFF_BSS (objfile); |
| break; |
| case N_ABS | N_EXT: |
| ms_type = mst_abs; |
| section = -1; |
| break; |
| #ifdef N_SETV |
| case N_SETV | N_EXT: |
| ms_type = mst_data; |
| section = SECT_OFF_DATA (objfile); |
| break; |
| case N_SETV: |
| /* I don't think this type actually exists; since a N_SETV is the result |
| of going over many .o files, it doesn't make sense to have one |
| file local. */ |
| ms_type = mst_file_data; |
| section = SECT_OFF_DATA (objfile); |
| break; |
| #endif |
| case N_TEXT: |
| case N_NBTEXT: |
| case N_FN: |
| case N_FN_SEQ: |
| ms_type = mst_file_text; |
| section = SECT_OFF_TEXT (objfile); |
| break; |
| case N_DATA: |
| ms_type = mst_file_data; |
| |
| /* Check for __DYNAMIC, which is used by Sun shared libraries. |
| Record it as global even if it's local, not global, so |
| lookup_minimal_symbol can find it. We don't check symbol_leading_char |
| because for SunOS4 it always is '_'. */ |
| if (strcmp ("__DYNAMIC", name) == 0) |
| ms_type = mst_data; |
| |
| /* Same with virtual function tables, both global and static. */ |
| { |
| const char *tempstring = name; |
| |
| if (*tempstring != '\0' |
| && *tempstring == bfd_get_symbol_leading_char (objfile->obfd.get ())) |
| ++tempstring; |
| if (is_vtable_name (tempstring)) |
| ms_type = mst_data; |
| } |
| section = SECT_OFF_DATA (objfile); |
| break; |
| case N_BSS: |
| ms_type = mst_file_bss; |
| section = SECT_OFF_BSS (objfile); |
| break; |
| default: |
| ms_type = mst_unknown; |
| section = -1; |
| break; |
| } |
| |
| if ((ms_type == mst_file_text || ms_type == mst_text) |
| && address < lowest_text_address) |
| lowest_text_address = address; |
| |
| reader.record_with_info (name, address, ms_type, section); |
| } |
| |
| /* Scan and build partial symbols for a symbol file. |
| We have been initialized by a call to dbx_symfile_init, which |
| put all the relevant info into a "struct dbx_symfile_info", |
| hung off the objfile structure. */ |
| |
| static void |
| dbx_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) |
| { |
| bfd *sym_bfd; |
| int val; |
| |
| sym_bfd = objfile->obfd.get (); |
| |
| /* .o and .nlm files are relocatables with text, data and bss segs based at |
| 0. This flag disables special (Solaris stabs-in-elf only) fixups for |
| symbols with a value of 0. */ |
| |
| symfile_relocatable = bfd_get_file_flags (sym_bfd) & HAS_RELOC; |
| |
| val = bfd_seek (sym_bfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET); |
| if (val < 0) |
| perror_with_name (objfile_name (objfile)); |
| |
| symbol_size = DBX_SYMBOL_SIZE (objfile); |
| symbol_table_offset = DBX_SYMTAB_OFFSET (objfile); |
| |
| scoped_free_pendings free_pending; |
| |
| minimal_symbol_reader reader (objfile); |
| |
| /* Read stabs data from executable file and define symbols. */ |
| |
| psymbol_functions *psf = new psymbol_functions (); |
| psymtab_storage *partial_symtabs = psf->get_partial_symtabs ().get (); |
| objfile->qf.emplace_front (psf); |
| read_dbx_symtab (reader, partial_symtabs, objfile); |
| |
| /* Install any minimal symbols that have been collected as the current |
| minimal symbols for this objfile. */ |
| |
| reader.install (); |
| } |
| |
| /* Initialize anything that needs initializing when a completely new |
| symbol file is specified (not just adding some symbols from another |
| file, e.g. a shared library). */ |
| |
| static void |
| dbx_new_init (struct objfile *ignore) |
| { |
| stabsread_new_init (); |
| init_header_files (); |
| } |
| |
| |
| /* dbx_symfile_init () |
| is the dbx-specific initialization routine for reading symbols. |
| It is passed a struct objfile which contains, among other things, |
| the BFD for the file whose symbols are being read, and a slot for a pointer |
| to "private data" which we fill with goodies. |
| |
| We read the string table into malloc'd space and stash a pointer to it. |
| |
| Since BFD doesn't know how to read debug symbols in a format-independent |
| way (and may never do so...), we have to do it ourselves. We will never |
| be called unless this is an a.out (or very similar) file. |
| FIXME, there should be a cleaner peephole into the BFD environment here. */ |
| |
| #define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */ |
| |
| static void |
| dbx_symfile_init (struct objfile *objfile) |
| { |
| int val; |
| bfd *sym_bfd = objfile->obfd.get (); |
| const char *name = bfd_get_filename (sym_bfd); |
| asection *text_sect; |
| unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE]; |
| |
| /* Allocate struct to keep track of the symfile. */ |
| dbx_objfile_data_key.emplace (objfile); |
| |
| DBX_TEXT_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".text"); |
| DBX_DATA_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".data"); |
| DBX_BSS_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".bss"); |
| |
| /* FIXME POKING INSIDE BFD DATA STRUCTURES. */ |
| #define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd)) |
| #define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd)) |
| |
| /* FIXME POKING INSIDE BFD DATA STRUCTURES. */ |
| |
| text_sect = bfd_get_section_by_name (sym_bfd, ".text"); |
| if (!text_sect) |
| error (_("Can't find .text section in symbol file")); |
| DBX_TEXT_ADDR (objfile) = bfd_section_vma (text_sect); |
| DBX_TEXT_SIZE (objfile) = bfd_section_size (text_sect); |
| |
| DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd); |
| DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd); |
| DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET; |
| |
| /* Read the string table and stash it away in the objfile_obstack. |
| When we blow away the objfile the string table goes away as well. |
| Note that gdb used to use the results of attempting to malloc the |
| string table, based on the size it read, as a form of sanity check |
| for botched byte swapping, on the theory that a byte swapped string |
| table size would be so totally bogus that the malloc would fail. Now |
| that we put in on the objfile_obstack, we can't do this since gdb gets |
| a fatal error (out of virtual memory) if the size is bogus. We can |
| however at least check to see if the size is less than the size of |
| the size field itself, or larger than the size of the entire file. |
| Note that all valid string tables have a size greater than zero, since |
| the bytes used to hold the size are included in the count. */ |
| |
| if (STRING_TABLE_OFFSET == 0) |
| { |
| /* It appears that with the existing bfd code, STRING_TABLE_OFFSET |
| will never be zero, even when there is no string table. This |
| would appear to be a bug in bfd. */ |
| DBX_STRINGTAB_SIZE (objfile) = 0; |
| DBX_STRINGTAB (objfile) = NULL; |
| } |
| else |
| { |
| val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET); |
| if (val < 0) |
| perror_with_name (name); |
| |
| memset (size_temp, 0, sizeof (size_temp)); |
| val = bfd_read (size_temp, sizeof (size_temp), sym_bfd); |
| if (val < 0) |
| { |
| perror_with_name (name); |
| } |
| else if (val == 0) |
| { |
| /* With the existing bfd code, STRING_TABLE_OFFSET will be set to |
| EOF if there is no string table, and attempting to read the size |
| from EOF will read zero bytes. */ |
| DBX_STRINGTAB_SIZE (objfile) = 0; |
| DBX_STRINGTAB (objfile) = NULL; |
| } |
| else |
| { |
| /* Read some data that would appear to be the string table size. |
| If there really is a string table, then it is probably the right |
| size. Byteswap if necessary and validate the size. Note that |
| the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some |
| random data that happened to be at STRING_TABLE_OFFSET, because |
| bfd can't tell us there is no string table, the sanity checks may |
| or may not catch this. */ |
| DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp); |
| |
| if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp) |
| || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) |
| error (_("ridiculous string table size (%d bytes)."), |
| DBX_STRINGTAB_SIZE (objfile)); |
| |
| DBX_STRINGTAB (objfile) = |
| (char *) obstack_alloc (&objfile->objfile_obstack, |
| DBX_STRINGTAB_SIZE (objfile)); |
| OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile)); |
| |
| /* Now read in the string table in one big gulp. */ |
| |
| val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET); |
| if (val < 0) |
| perror_with_name (name); |
| val = bfd_read (DBX_STRINGTAB (objfile), |
| DBX_STRINGTAB_SIZE (objfile), |
| sym_bfd); |
| if (val != DBX_STRINGTAB_SIZE (objfile)) |
| perror_with_name (name); |
| } |
| } |
| } |
| |
| /* Perform any local cleanups required when we are done with a particular |
| objfile. I.E, we are in the process of discarding all symbol information |
| for an objfile, freeing up all memory held for it, and unlinking the |
| objfile struct from the global list of known objfiles. */ |
| |
| static void |
| dbx_symfile_finish (struct objfile *objfile) |
| { |
| free_header_files (); |
| } |
| |
| dbx_symfile_info::~dbx_symfile_info () |
| { |
| if (header_files != NULL) |
| { |
| int i = n_header_files; |
| struct header_file *hfiles = header_files; |
| |
| while (--i >= 0) |
| { |
| xfree (hfiles[i].name); |
| xfree (hfiles[i].vector); |
| } |
| xfree (hfiles); |
| } |
| } |
| |
| |
| |
| /* Buffer for reading the symbol table entries. */ |
| static struct external_nlist symbuf[4096]; |
| static int symbuf_idx; |
| static int symbuf_end; |
| |
| /* Name of last function encountered. Used in Solaris to approximate |
| object file boundaries. */ |
| static const char *last_function_name; |
| |
| /* The address in memory of the string table of the object file we are |
| reading (which might not be the "main" object file, but might be a |
| shared library or some other dynamically loaded thing). This is |
| set by read_dbx_symtab when building psymtabs, and by |
| read_ofile_symtab when building symtabs, and is used only by |
| next_symbol_text. FIXME: If that is true, we don't need it when |
| building psymtabs, right? */ |
| static char *stringtab_global; |
| |
| /* These variables are used to control fill_symbuf when the stabs |
| symbols are not contiguous (as may be the case when a COFF file is |
| linked using --split-by-reloc). */ |
| static const std::vector<asection *> *symbuf_sections; |
| static size_t sect_idx; |
| static unsigned int symbuf_left; |
| static unsigned int symbuf_read; |
| |
| /* This variable stores a global stabs buffer, if we read stabs into |
| memory in one chunk in order to process relocations. */ |
| static bfd_byte *stabs_data; |
| |
| /* Refill the symbol table input buffer |
| and set the variables that control fetching entries from it. |
| Reports an error if no data available. |
| This function can read past the end of the symbol table |
| (into the string table) but this does no harm. */ |
| |
| static void |
| fill_symbuf (bfd *sym_bfd) |
| { |
| unsigned int count; |
| int nbytes; |
| |
| if (stabs_data) |
| { |
| nbytes = sizeof (symbuf); |
| if (nbytes > symbuf_left) |
| nbytes = symbuf_left; |
| memcpy (symbuf, stabs_data + symbuf_read, nbytes); |
| } |
| else if (symbuf_sections == NULL) |
| { |
| count = sizeof (symbuf); |
| nbytes = bfd_read (symbuf, count, sym_bfd); |
| } |
| else |
| { |
| if (symbuf_left <= 0) |
| { |
| file_ptr filepos = (*symbuf_sections)[sect_idx]->filepos; |
| |
| if (bfd_seek (sym_bfd, filepos, SEEK_SET) != 0) |
| perror_with_name (bfd_get_filename (sym_bfd)); |
| symbuf_left = bfd_section_size ((*symbuf_sections)[sect_idx]); |
| symbol_table_offset = filepos - symbuf_read; |
| ++sect_idx; |
| } |
| |
| count = symbuf_left; |
| if (count > sizeof (symbuf)) |
| count = sizeof (symbuf); |
| nbytes = bfd_read (symbuf, count, sym_bfd); |
| } |
| |
| if (nbytes < 0) |
| perror_with_name (bfd_get_filename (sym_bfd)); |
| else if (nbytes == 0) |
| error (_("Premature end of file reading symbol table")); |
| symbuf_end = nbytes / symbol_size; |
| symbuf_idx = 0; |
| symbuf_left -= nbytes; |
| symbuf_read += nbytes; |
| } |
| |
| static void |
| stabs_seek (int sym_offset) |
| { |
| if (stabs_data) |
| { |
| symbuf_read += sym_offset; |
| symbuf_left -= sym_offset; |
| } |
| else |
| if (bfd_seek (symfile_bfd, sym_offset, SEEK_CUR) != 0) |
| perror_with_name (bfd_get_filename (symfile_bfd)); |
| } |
| |
| #define INTERNALIZE_SYMBOL(intern, extern, abfd) \ |
| { \ |
| (intern).n_strx = bfd_h_get_32 (abfd, (extern)->e_strx); \ |
| (intern).n_type = bfd_h_get_8 (abfd, (extern)->e_type); \ |
| (intern).n_other = 0; \ |
| (intern).n_desc = bfd_h_get_16 (abfd, (extern)->e_desc); \ |
| if (bfd_get_sign_extend_vma (abfd)) \ |
| (intern).n_value = bfd_h_get_signed_32 (abfd, (extern)->e_value); \ |
| else \ |
| (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \ |
| } |
| |
| /* Invariant: The symbol pointed to by symbuf_idx is the first one |
| that hasn't been swapped. Swap the symbol at the same time |
| that symbuf_idx is incremented. */ |
| |
| /* dbx allows the text of a symbol name to be continued into the |
| next symbol name! When such a continuation is encountered |
| (a \ at the end of the text of a name) |
| call this function to get the continuation. */ |
| |
| static const char * |
| dbx_next_symbol_text (struct objfile *objfile) |
| { |
| struct internal_nlist nlist; |
| |
| if (symbuf_idx == symbuf_end) |
| fill_symbuf (symfile_bfd); |
| |
| symnum++; |
| INTERNALIZE_SYMBOL (nlist, &symbuf[symbuf_idx], symfile_bfd); |
| OBJSTAT (objfile, n_stabs++); |
| |
| symbuf_idx++; |
| |
| return nlist.n_strx + stringtab_global + file_string_table_offset; |
| } |
| |
| |
| /* Given a name, value pair, find the corresponding |
| bincl in the list. Return the partial symtab associated |
| with that header_file_location. */ |
| |
| static legacy_psymtab * |
| find_corresponding_bincl_psymtab (const char *name, int instance) |
| { |
| for (const header_file_location &bincl : *bincl_list) |
| if (bincl.instance == instance |
| && strcmp (name, bincl.name) == 0) |
| return bincl.pst; |
| |
| repeated_header_complaint (name, symnum); |
| return (legacy_psymtab *) 0; |
| } |
| |
| /* Set namestring based on nlist. If the string table index is invalid, |
| give a fake name, and print a single error message per symbol file read, |
| rather than abort the symbol reading or flood the user with messages. */ |
| |
| static const char * |
| set_namestring (struct objfile *objfile, const struct internal_nlist *nlist) |
| { |
| const char *namestring; |
| |
| if (nlist->n_strx + file_string_table_offset |
| >= DBX_STRINGTAB_SIZE (objfile) |
| || nlist->n_strx + file_string_table_offset < nlist->n_strx) |
| { |
| complaint (_("bad string table offset in symbol %d"), |
| symnum); |
| namestring = "<bad string table offset>"; |
| } |
| else |
| namestring = (nlist->n_strx + file_string_table_offset |
| + DBX_STRINGTAB (objfile)); |
| return namestring; |
| } |
| |
| static bound_minimal_symbol |
| find_stab_function (const char *namestring, const char *filename, |
| struct objfile *objfile) |
| { |
| int n; |
| |
| const char *colon = strchr (namestring, ':'); |
| if (colon == NULL) |
| n = 0; |
| else |
| n = colon - namestring; |
| |
| char *p = (char *) alloca (n + 2); |
| strncpy (p, namestring, n); |
| p[n] = 0; |
| |
| bound_minimal_symbol msym |
| = lookup_minimal_symbol (current_program_space, p, objfile, filename); |
| if (msym.minsym == NULL) |
| { |
| /* Sun Fortran appends an underscore to the minimal symbol name, |
| try again with an appended underscore if the minimal symbol |
| was not found. */ |
| p[n] = '_'; |
| p[n + 1] = 0; |
| msym |
| = lookup_minimal_symbol (current_program_space, p, objfile, filename); |
| } |
| |
| if (msym.minsym == NULL && filename != NULL) |
| { |
| /* Try again without the filename. */ |
| p[n] = 0; |
| msym = lookup_minimal_symbol (current_program_space, p, objfile); |
| } |
| if (msym.minsym == NULL && filename != NULL) |
| { |
| /* And try again for Sun Fortran, but without the filename. */ |
| p[n] = '_'; |
| p[n + 1] = 0; |
| msym = lookup_minimal_symbol (current_program_space, p, objfile); |
| } |
| |
| return msym; |
| } |
| |
| static void |
| function_outside_compilation_unit_complaint (const char *arg1) |
| { |
| complaint (_("function `%s' appears to be defined " |
| "outside of all compilation units"), |
| arg1); |
| } |
| |
| /* Setup partial_symtab's describing each source file for which |
| debugging information is available. */ |
| |
| static void |
| read_dbx_symtab (minimal_symbol_reader &reader, |
| psymtab_storage *partial_symtabs, |
| struct objfile *objfile) |
| { |
| struct gdbarch *gdbarch = objfile->arch (); |
| struct external_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch. */ |
| struct internal_nlist nlist; |
| CORE_ADDR text_addr; |
| int text_size; |
| const char *sym_name; |
| int sym_len; |
| |
| const char *namestring; |
| int nsl; |
| int past_first_source_file = 0; |
| CORE_ADDR last_function_start = 0; |
| bfd *abfd; |
| int textlow_not_set; |
| int data_sect_index; |
| |
| /* Current partial symtab. */ |
| legacy_psymtab *pst; |
| |
| /* List of current psymtab's include files. */ |
| const char **psymtab_include_list; |
| int includes_allocated; |
| int includes_used; |
| |
| /* Index within current psymtab dependency list. */ |
| legacy_psymtab **dependency_list; |
| int dependencies_used, dependencies_allocated; |
| |
| text_addr = DBX_TEXT_ADDR (objfile); |
| text_size = DBX_TEXT_SIZE (objfile); |
| |
| /* FIXME. We probably want to change stringtab_global rather than add this |
| while processing every symbol entry. FIXME. */ |
| file_string_table_offset = 0; |
| next_file_string_table_offset = 0; |
| |
| stringtab_global = DBX_STRINGTAB (objfile); |
| |
| pst = (legacy_psymtab *) 0; |
| |
| includes_allocated = 30; |
| includes_used = 0; |
| psymtab_include_list = (const char **) alloca (includes_allocated * |
| sizeof (const char *)); |
| |
| dependencies_allocated = 30; |
| dependencies_used = 0; |
| dependency_list = |
| (legacy_psymtab **) alloca (dependencies_allocated * |
| sizeof (legacy_psymtab *)); |
| |
| /* Init bincl list */ |
| std::vector<struct header_file_location> bincl_storage; |
| scoped_restore restore_bincl_global |
| = make_scoped_restore (&bincl_list, &bincl_storage); |
| |
| set_last_source_file (NULL); |
| |
| lowest_text_address = (unrelocated_addr) -1; |
| |
| symfile_bfd = objfile->obfd.get (); /* For next_text_symbol. */ |
| abfd = objfile->obfd.get (); |
| symbuf_end = symbuf_idx = 0; |
| next_symbol_text_func = dbx_next_symbol_text; |
| textlow_not_set = 1; |
| has_line_numbers = 0; |
| |
| /* FIXME: jimb/2003-09-12: We don't apply the right section's offset |
| to global and static variables. The stab for a global or static |
| variable doesn't give us any indication of which section it's in, |
| so we can't tell immediately which offset in |
| objfile->section_offsets we should apply to the variable's |
| address. |
| |
| We could certainly find out which section contains the variable |
| by looking up the variable's unrelocated address with |
| find_pc_section, but that would be expensive; this is the |
| function that constructs the partial symbol tables by examining |
| every symbol in the entire executable, and it's |
| performance-critical. So that expense would not be welcome. I'm |
| not sure what to do about this at the moment. |
| |
| What we have done for years is to simply assume that the .data |
| section's offset is appropriate for all global and static |
| variables. Recently, this was expanded to fall back to the .bss |
| section's offset if there is no .data section, and then to the |
| .rodata section's offset. */ |
| data_sect_index = objfile->sect_index_data; |
| if (data_sect_index == -1) |
| data_sect_index = SECT_OFF_BSS (objfile); |
| if (data_sect_index == -1) |
| data_sect_index = SECT_OFF_RODATA (objfile); |
| |
| /* If data_sect_index is still -1, that's okay. It's perfectly fine |
| for the file to have no .data, no .bss, and no .text at all, if |
| it also has no global or static variables. */ |
| |
| for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++) |
| { |
| /* Get the symbol for this run and pull out some info. */ |
| QUIT; /* Allow this to be interruptable. */ |
| if (symbuf_idx == symbuf_end) |
| fill_symbuf (abfd); |
| bufp = &symbuf[symbuf_idx++]; |
| |
| /* |
| * Special case to speed up readin. |
| */ |
| if (bfd_h_get_8 (abfd, bufp->e_type) == N_SLINE) |
| { |
| has_line_numbers = 1; |
| continue; |
| } |
| |
| INTERNALIZE_SYMBOL (nlist, bufp, abfd); |
| OBJSTAT (objfile, n_stabs++); |
| |
| /* Ok. There is a lot of code duplicated in the rest of this |
| switch statement (for efficiency reasons). Since I don't |
| like duplicating code, I will do my penance here, and |
| describe the code which is duplicated: |
| |
| *) The assignment to namestring. |
| *) The call to strchr. |
| *) The addition of a partial symbol the two partial |
| symbol lists. This last is a large section of code, so |
| I've embedded it in the following macro. */ |
| |
| switch (nlist.n_type) |
| { |
| /* |
| * Standard, external, non-debugger, symbols |
| */ |
| |
| case N_TEXT | N_EXT: |
| case N_NBTEXT | N_EXT: |
| goto record_it; |
| |
| case N_DATA | N_EXT: |
| case N_NBDATA | N_EXT: |
| goto record_it; |
| |
| case N_BSS: |
| case N_BSS | N_EXT: |
| case N_NBBSS | N_EXT: |
| case N_SETV | N_EXT: /* FIXME, is this in BSS? */ |
| goto record_it; |
| |
| case N_ABS | N_EXT: |
| record_it: |
| namestring = set_namestring (objfile, &nlist); |
| |
| record_minimal_symbol (reader, namestring, |
| unrelocated_addr (nlist.n_value), |
| nlist.n_type, objfile); /* Always */ |
| continue; |
| |
| /* Standard, local, non-debugger, symbols. */ |
| |
| case N_NBTEXT: |
| |
| /* We need to be able to deal with both N_FN or N_TEXT, |
| because we have no way of knowing whether the sys-supplied ld |
| or GNU ld was used to make the executable. Sequents throw |
| in another wrinkle -- they renumbered N_FN. */ |
| |
| case N_FN: |
| case N_FN_SEQ: |
| case N_TEXT: |
| namestring = set_namestring (objfile, &nlist); |
| |
| if ((namestring[0] == '-' && namestring[1] == 'l') |
| || (namestring[(nsl = strlen (namestring)) - 1] == 'o' |
| && namestring[nsl - 2] == '.')) |
| { |
| unrelocated_addr unrel_val = unrelocated_addr (nlist.n_value); |
| |
| if (past_first_source_file && pst |
| /* The gould NP1 uses low values for .o and -l symbols |
| which are not the address. */ |
| && unrel_val >= pst->unrelocated_text_low ()) |
| { |
| dbx_end_psymtab (objfile, partial_symtabs, |
| pst, psymtab_include_list, |
| includes_used, symnum * symbol_size, |
| unrel_val > pst->unrelocated_text_high () |
| ? unrel_val : pst->unrelocated_text_high (), |
| dependency_list, dependencies_used, |
| textlow_not_set); |
| pst = (legacy_psymtab *) 0; |
| includes_used = 0; |
| dependencies_used = 0; |
| has_line_numbers = 0; |
| } |
| else |
| past_first_source_file = 1; |
| } |
| else |
| goto record_it; |
| continue; |
| |
| case N_DATA: |
| goto record_it; |
| |
| case N_UNDF | N_EXT: |
| /* The case (nlist.n_value != 0) is a "Fortran COMMON" symbol. |
| We used to rely on the target to tell us whether it knows |
| where the symbol has been relocated to, but none of the |
| target implementations actually provided that operation. |
| So we just ignore the symbol, the same way we would do if |
| we had a target-side symbol lookup which returned no match. |
| |
| All other symbols (with nlist.n_value == 0), are really |
| undefined, and so we ignore them too. */ |
| continue; |
| |
| case N_UNDF: |
| if (processing_acc_compilation && nlist.n_strx == 1) |
| { |
| /* Deal with relative offsets in the string table |
| used in ELF+STAB under Solaris. If we want to use the |
| n_strx field, which contains the name of the file, |
| we must adjust file_string_table_offset *before* calling |
| set_namestring(). */ |
| past_first_source_file = 1; |
| file_string_table_offset = next_file_string_table_offset; |
| next_file_string_table_offset = |
| file_string_table_offset + nlist.n_value; |
| if (next_file_string_table_offset < file_string_table_offset) |
| error (_("string table offset backs up at %d"), symnum); |
| /* FIXME -- replace error() with complaint. */ |
| continue; |
| } |
| continue; |
| |
| /* Lots of symbol types we can just ignore. */ |
| |
| case N_ABS: |
| case N_NBDATA: |
| case N_NBBSS: |
| continue; |
| |
| /* Keep going . . . */ |
| |
| /* |
| * Special symbol types for GNU |
| */ |
| case N_INDR: |
| case N_INDR | N_EXT: |
| case N_SETA: |
| case N_SETA | N_EXT: |
| case N_SETT: |
| case N_SETT | N_EXT: |
| case N_SETD: |
| case N_SETD | N_EXT: |
| case N_SETB: |
| case N_SETB | N_EXT: |
| case N_SETV: |
| continue; |
| |
| /* |
| * Debugger symbols |
| */ |
| |
| case N_SO: |
| { |
| CORE_ADDR valu; |
| static int prev_so_symnum = -10; |
| static int first_so_symnum; |
| const char *p; |
| static const char *dirname_nso; |
| int prev_textlow_not_set; |
| |
| valu = nlist.n_value; |
| |
| prev_textlow_not_set = textlow_not_set; |
| |
| /* A zero value is probably an indication for the SunPRO 3.0 |
| compiler. dbx_end_psymtab explicitly tests for zero, so |
| don't relocate it. */ |
| |
| if (nlist.n_value == 0 |
| && gdbarch_sofun_address_maybe_missing (gdbarch)) |
| { |
| textlow_not_set = 1; |
| valu = 0; |
| } |
| else |
| textlow_not_set = 0; |
| |
| past_first_source_file = 1; |
| |
| if (prev_so_symnum != symnum - 1) |
| { /* Here if prev stab wasn't N_SO. */ |
| first_so_symnum = symnum; |
| |
| if (pst) |
| { |
| unrelocated_addr unrel_value = unrelocated_addr (valu); |
| dbx_end_psymtab (objfile, partial_symtabs, |
| pst, psymtab_include_list, |
| includes_used, symnum * symbol_size, |
| unrel_value > pst->unrelocated_text_high () |
| ? unrel_value |
| : pst->unrelocated_text_high (), |
| dependency_list, dependencies_used, |
| prev_textlow_not_set); |
| pst = (legacy_psymtab *) 0; |
| includes_used = 0; |
| dependencies_used = 0; |
| has_line_numbers = 0; |
| } |
| } |
| |
| prev_so_symnum = symnum; |
| |
| /* End the current partial symtab and start a new one. */ |
| |
| namestring = set_namestring (objfile, &nlist); |
| |
| /* Null name means end of .o file. Don't start a new one. */ |
| if (*namestring == '\000') |
| continue; |
| |
| /* Some compilers (including gcc) emit a pair of initial N_SOs. |
| The first one is a directory name; the second the file name. |
| If pst exists, is empty, and has a filename ending in '/', |
| we assume the previous N_SO was a directory name. */ |
| |
| p = lbasename (namestring); |
| if (p != namestring && *p == '\000') |
| { |
| /* Save the directory name SOs locally, then save it into |
| the psymtab when it's created below. */ |
| dirname_nso = namestring; |
| continue; |
| } |
| |
| /* Some other compilers (C++ ones in particular) emit useless |
| SOs for non-existant .c files. We ignore all subsequent SOs |
| that immediately follow the first. */ |
| |
| if (!pst) |
| { |
| pst = start_psymtab (partial_symtabs, objfile, |
| namestring, |
| unrelocated_addr (valu), |
| first_so_symnum * symbol_size); |
| pst->dirname = dirname_nso; |
| dirname_nso = NULL; |
| } |
| continue; |
| } |
| |
| case N_BINCL: |
| { |
| enum language tmp_language; |
| |
| /* Add this bincl to the bincl_list for future EXCLs. No |
| need to save the string; it'll be around until |
| read_dbx_symtab function returns. */ |
| |
| namestring = set_namestring (objfile, &nlist); |
| tmp_language = deduce_language_from_filename (namestring); |
| |
| /* Only change the psymtab's language if we've learned |
| something useful (eg. tmp_language is not language_unknown). |
| In addition, to match what start_subfile does, never change |
| from C++ to C. */ |
| if (tmp_language != language_unknown |
| && (tmp_language != language_c |
| || psymtab_language != language_cplus)) |
| psymtab_language = tmp_language; |
| |
| if (pst == NULL) |
| { |
| /* FIXME: we should not get here without a PST to work on. |
| Attempt to recover. */ |
| complaint (_("N_BINCL %s not in entries for " |
| "any file, at symtab pos %d"), |
| namestring, symnum); |
| continue; |
| } |
| bincl_list->emplace_back (namestring, nlist.n_value, pst); |
| |
| /* Mark down an include file in the current psymtab. */ |
| |
| goto record_include_file; |
| } |
| |
| case N_SOL: |
| { |
| enum language tmp_language; |
| |
| /* Mark down an include file in the current psymtab. */ |
| namestring = set_namestring (objfile, &nlist); |
| tmp_language = deduce_language_from_filename (namestring); |
| |
| /* Only change the psymtab's language if we've learned |
| something useful (eg. tmp_language is not language_unknown). |
| In addition, to match what start_subfile does, never change |
| from C++ to C. */ |
| if (tmp_language != language_unknown |
| && (tmp_language != language_c |
| || psymtab_language != language_cplus)) |
| psymtab_language = tmp_language; |
| |
| /* In C++, one may expect the same filename to come round many |
| times, when code is coming alternately from the main file |
| and from inline functions in other files. So I check to see |
| if this is a file we've seen before -- either the main |
| source file, or a previously included file. |
| |
| This seems to be a lot of time to be spending on N_SOL, but |
| things like "break c-exp.y:435" need to work (I |
| suppose the psymtab_include_list could be hashed or put |
| in a binary tree, if profiling shows this is a major hog). */ |
| if (pst && filename_cmp (namestring, pst->filename) == 0) |
| continue; |
| { |
| int i; |
| |
| for (i = 0; i < includes_used; i++) |
| if (filename_cmp (namestring, psymtab_include_list[i]) == 0) |
| { |
| i = -1; |
| break; |
| } |
| if (i == -1) |
| continue; |
| } |
| |
| record_include_file: |
| |
| psymtab_include_list[includes_used++] = namestring; |
| if (includes_used >= includes_allocated) |
| { |
| const char **orig = psymtab_include_list; |
| |
| psymtab_include_list = (const char **) |
| alloca ((includes_allocated *= 2) * sizeof (const char *)); |
| memcpy (psymtab_include_list, orig, |
| includes_used * sizeof (const char *)); |
| } |
| continue; |
| } |
| case N_LSYM: /* Typedef or automatic variable. */ |
| case N_STSYM: /* Data seg var -- static. */ |
| case N_LCSYM: /* BSS " */ |
| case N_ROSYM: /* Read-only data seg var -- static. */ |
| case N_NBSTS: /* Gould nobase. */ |
| case N_NBLCS: /* symbols. */ |
| case N_FUN: |
| case N_GSYM: /* Global (extern) variable; can be |
| data or bss (sigh FIXME). */ |
| |
| /* Following may probably be ignored; I'll leave them here |
| for now (until I do Pascal and Modula 2 extensions). */ |
| |
| case N_PC: /* I may or may not need this; I |
| suspect not. */ |
| case N_M2C: /* I suspect that I can ignore this here. */ |
| case N_SCOPE: /* Same. */ |
| { |
| const char *p; |
| |
| namestring = set_namestring (objfile, &nlist); |
| |
| /* See if this is an end of function stab. */ |
| if (pst && nlist.n_type == N_FUN && *namestring == '\000') |
| { |
| unrelocated_addr valu; |
| |
| /* It's value is the size (in bytes) of the function for |
| function relative stabs, or the address of the function's |
| end for old style stabs. */ |
| valu = unrelocated_addr (nlist.n_value + last_function_start); |
| if (pst->unrelocated_text_high () == unrelocated_addr (0) |
| || valu > pst->unrelocated_text_high ()) |
| pst->set_text_high (valu); |
| break; |
| } |
| |
| p = (char *) strchr (namestring, ':'); |
| if (!p) |
| continue; /* Not a debugging symbol. */ |
| |
| sym_len = 0; |
| sym_name = NULL; /* pacify "gcc -Werror" */ |
| if (psymtab_language == language_cplus) |
| { |
| std::string name (namestring, p - namestring); |
| gdb::unique_xmalloc_ptr<char> new_name |
| = cp_canonicalize_string (name.c_str ()); |
| if (new_name != nullptr) |
| { |
| sym_len = strlen (new_name.get ()); |
| sym_name = obstack_strdup (&objfile->objfile_obstack, |
| new_name.get ()); |
| } |
| } |
| else if (psymtab_language == language_c) |
| { |
| std::string name (namestring, p - namestring); |
| gdb::unique_xmalloc_ptr<char> new_name |
| = c_canonicalize_name (name.c_str ()); |
| if (new_name != nullptr) |
| { |
| sym_len = strlen (new_name.get ()); |
| sym_name = obstack_strdup (&objfile->objfile_obstack, |
| new_name.get ()); |
| } |
| } |
| |
| if (sym_len == 0) |
| { |
| sym_name = namestring; |
| sym_len = p - namestring; |
| } |
| |
| /* Main processing section for debugging symbols which |
| the initial read through the symbol tables needs to worry |
| about. If we reach this point, the symbol which we are |
| considering is definitely one we are interested in. |
| p must also contain the (valid) index into the namestring |
| which indicates the debugging type symbol. */ |
| |
| switch (p[1]) |
| { |
| case 'S': |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (sym_name, sym_len), true, |
| VAR_DOMAIN, LOC_STATIC, |
| data_sect_index, |
| psymbol_placement::STATIC, |
| unrelocated_addr (nlist.n_value), |
| psymtab_language, |
| partial_symtabs, objfile); |
| else |
| complaint (_("static `%*s' appears to be defined " |
| "outside of all compilation units"), |
| sym_len, sym_name); |
| continue; |
| |
| case 'G': |
| /* The addresses in these entries are reported to be |
| wrong. See the code that reads 'G's for symtabs. */ |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (sym_name, sym_len), true, |
| VAR_DOMAIN, LOC_STATIC, |
| data_sect_index, |
| psymbol_placement::GLOBAL, |
| unrelocated_addr (nlist.n_value), |
| psymtab_language, |
| partial_symtabs, objfile); |
| else |
| complaint (_("global `%*s' appears to be defined " |
| "outside of all compilation units"), |
| sym_len, sym_name); |
| continue; |
| |
| case 'T': |
| /* When a 'T' entry is defining an anonymous enum, it |
| may have a name which is the empty string, or a |
| single space. Since they're not really defining a |
| symbol, those shouldn't go in the partial symbol |
| table. We do pick up the elements of such enums at |
| 'check_enum:', below. */ |
| if (p >= namestring + 2 |
| || (p == namestring + 1 |
| && namestring[0] != ' ')) |
| { |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (sym_name, sym_len), |
| true, STRUCT_DOMAIN, LOC_TYPEDEF, -1, |
| psymbol_placement::STATIC, |
| unrelocated_addr (0), |
| psymtab_language, |
| partial_symtabs, objfile); |
| else |
| complaint (_("enum, struct, or union `%*s' appears " |
| "to be defined outside of all " |
| "compilation units"), |
| sym_len, sym_name); |
| if (p[2] == 't') |
| { |
| /* Also a typedef with the same name. */ |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (sym_name, sym_len), |
| true, VAR_DOMAIN, LOC_TYPEDEF, -1, |
| psymbol_placement::STATIC, |
| unrelocated_addr (0), |
| psymtab_language, |
| partial_symtabs, objfile); |
| else |
| complaint (_("typedef `%*s' appears to be defined " |
| "outside of all compilation units"), |
| sym_len, sym_name); |
| p += 1; |
| } |
| } |
| goto check_enum; |
| |
| case 't': |
| if (p != namestring) /* a name is there, not just :T... */ |
| { |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (sym_name, sym_len), |
| true, VAR_DOMAIN, LOC_TYPEDEF, -1, |
| psymbol_placement::STATIC, |
| unrelocated_addr (0), |
| psymtab_language, |
| partial_symtabs, objfile); |
| else |
| complaint (_("typename `%*s' appears to be defined " |
| "outside of all compilation units"), |
| sym_len, sym_name); |
| } |
| check_enum: |
| /* If this is an enumerated type, we need to |
| add all the enum constants to the partial symbol |
| table. This does not cover enums without names, e.g. |
| "enum {a, b} c;" in C, but fortunately those are |
| rare. There is no way for GDB to find those from the |
| enum type without spending too much time on it. Thus |
| to solve this problem, the compiler needs to put out the |
| enum in a nameless type. GCC2 does this. */ |
| |
| /* We are looking for something of the form |
| <name> ":" ("t" | "T") [<number> "="] "e" |
| {<constant> ":" <value> ","} ";". */ |
| |
| /* Skip over the colon and the 't' or 'T'. */ |
| p += 2; |
| /* This type may be given a number. Also, numbers can come |
| in pairs like (0,26). Skip over it. */ |
| while ((*p >= '0' && *p <= '9') |
| || *p == '(' || *p == ',' || *p == ')' |
| || *p == '=') |
| p++; |
| |
| if (*p++ == 'e') |
| { |
| /* The aix4 compiler emits extra crud before the members. */ |
| if (*p == '-') |
| { |
| /* Skip over the type (?). */ |
| while (*p != ':') |
| p++; |
| |
| /* Skip over the colon. */ |
| p++; |
| } |
| |
| /* We have found an enumerated type. */ |
| /* According to comments in read_enum_type |
| a comma could end it instead of a semicolon. |
| I don't know where that happens. |
| Accept either. */ |
| while (*p && *p != ';' && *p != ',') |
| { |
| const char *q; |
| |
| /* Check for and handle cretinous dbx symbol name |
| continuation! */ |
| if (*p == '\\' || (*p == '?' && p[1] == '\0')) |
| p = next_symbol_text (objfile); |
| |
| /* Point to the character after the name |
| of the enum constant. */ |
| for (q = p; *q && *q != ':'; q++) |
| ; |
| /* Note that the value doesn't matter for |
| enum constants in psymtabs, just in symtabs. */ |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (p, q - p), true, |
| VAR_DOMAIN, LOC_CONST, -1, |
| psymbol_placement::STATIC, |
| unrelocated_addr (0), |
| psymtab_language, |
| partial_symtabs, objfile); |
| else |
| complaint (_("enum constant `%*s' appears to be defined " |
| "outside of all compilation units"), |
| ((int) (q - p)), p); |
| /* Point past the name. */ |
| p = q; |
| /* Skip over the value. */ |
| while (*p && *p != ',') |
| p++; |
| /* Advance past the comma. */ |
| if (*p) |
| p++; |
| } |
| } |
| continue; |
| |
| case 'c': |
| /* Constant, e.g. from "const" in Pascal. */ |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (sym_name, sym_len), true, |
| VAR_DOMAIN, LOC_CONST, -1, |
| psymbol_placement::STATIC, |
| unrelocated_addr (0), |
| psymtab_language, |
| partial_symtabs, objfile); |
| else |
| complaint (_("constant `%*s' appears to be defined " |
| "outside of all compilation units"), |
| sym_len, sym_name); |
| |
| continue; |
| |
| case 'f': |
| if (! pst) |
| { |
| std::string name (namestring, (p - namestring)); |
| function_outside_compilation_unit_complaint (name.c_str ()); |
| } |
| /* Kludges for ELF/STABS with Sun ACC. */ |
| last_function_name = namestring; |
| /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit |
| value for the bottom of the text seg in those cases. */ |
| if (nlist.n_value == 0 |
| && gdbarch_sofun_address_maybe_missing (gdbarch)) |
| { |
| bound_minimal_symbol minsym |
| = find_stab_function (namestring, |
| pst ? pst->filename : NULL, objfile); |
| if (minsym.minsym != NULL) |
| nlist.n_value |
| = CORE_ADDR (minsym.minsym->unrelocated_address ()); |
| } |
| if (pst && textlow_not_set |
| && gdbarch_sofun_address_maybe_missing (gdbarch)) |
| { |
| pst->set_text_low (unrelocated_addr (nlist.n_value)); |
| textlow_not_set = 0; |
| } |
| /* End kludge. */ |
| |
| /* Keep track of the start of the last function so we |
| can handle end of function symbols. */ |
| last_function_start = nlist.n_value; |
| |
| /* In reordered executables this function may lie outside |
| the bounds created by N_SO symbols. If that's the case |
| use the address of this function as the low bound for |
| the partial symbol table. */ |
| if (pst |
| && (textlow_not_set |
| || (unrelocated_addr (nlist.n_value) |
| < pst->unrelocated_text_low () |
| && (nlist.n_value != 0)))) |
| { |
| pst->set_text_low (unrelocated_addr (nlist.n_value)); |
| textlow_not_set = 0; |
| } |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (sym_name, sym_len), true, |
| VAR_DOMAIN, LOC_BLOCK, |
| SECT_OFF_TEXT (objfile), |
| psymbol_placement::STATIC, |
| unrelocated_addr (nlist.n_value), |
| psymtab_language, |
| partial_symtabs, objfile); |
| continue; |
| |
| /* Global functions were ignored here, but now they |
| are put into the global psymtab like one would expect. |
| They're also in the minimal symbol table. */ |
| case 'F': |
| if (! pst) |
| { |
| std::string name (namestring, (p - namestring)); |
| function_outside_compilation_unit_complaint (name.c_str ()); |
| } |
| /* Kludges for ELF/STABS with Sun ACC. */ |
| last_function_name = namestring; |
| /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit |
| value for the bottom of the text seg in those cases. */ |
| if (nlist.n_value == 0 |
| && gdbarch_sofun_address_maybe_missing (gdbarch)) |
| { |
| bound_minimal_symbol minsym |
| = find_stab_function (namestring, |
| pst ? pst->filename : NULL, objfile); |
| if (minsym.minsym != NULL) |
| nlist.n_value |
| = CORE_ADDR (minsym.minsym->unrelocated_address ()); |
| } |
| if (pst && textlow_not_set |
| && gdbarch_sofun_address_maybe_missing (gdbarch)) |
| { |
| pst->set_text_low (unrelocated_addr (nlist.n_value)); |
| textlow_not_set = 0; |
| } |
| /* End kludge. */ |
| |
| /* Keep track of the start of the last function so we |
| can handle end of function symbols. */ |
| last_function_start = nlist.n_value; |
| |
| /* In reordered executables this function may lie outside |
| the bounds created by N_SO symbols. If that's the case |
| use the address of this function as the low bound for |
| the partial symbol table. */ |
| if (pst |
| && (textlow_not_set |
| || (unrelocated_addr (nlist.n_value) |
| < pst->unrelocated_text_low () |
| && (nlist.n_value != 0)))) |
| { |
| pst->set_text_low (unrelocated_addr (nlist.n_value)); |
| textlow_not_set = 0; |
| } |
| if (pst != nullptr) |
| pst->add_psymbol (std::string_view (sym_name, sym_len), true, |
| VAR_DOMAIN, LOC_BLOCK, |
| SECT_OFF_TEXT (objfile), |
| psymbol_placement::GLOBAL, |
| unrelocated_addr (nlist.n_value), |
| psymtab_language, |
| partial_symtabs, objfile); |
| continue; |
| |
| /* Two things show up here (hopefully); static symbols of |
| local scope (static used inside braces) or extensions |
| of structure symbols. We can ignore both. */ |
| case 'V': |
| case '(': |
| case '0': |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| case '8': |
| case '9': |
| case '-': |
| case '#': /* For symbol identification (used in live ranges). */ |
| continue; |
| |
| case ':': |
| /* It is a C++ nested symbol. We don't need to record it |
| (I don't think); if we try to look up foo::bar::baz, |
| then symbols for the symtab containing foo should get |
| read in, I think. */ |
| /* Someone says sun cc puts out symbols like |
| /foo/baz/maclib::/usr/local/bin/maclib, |
| which would get here with a symbol type of ':'. */ |
| continue; |
| |
| default: |
| /* Unexpected symbol descriptor. The second and subsequent stabs |
| of a continued stab can show up here. The question is |
| whether they ever can mimic a normal stab--it would be |
| nice if not, since we certainly don't want to spend the |
| time searching to the end of every string looking for |
| a backslash. */ |
| |
| complaint (_("unknown symbol descriptor `%c'"), |
| p[1]); |
| |
| /* Ignore it; perhaps it is an extension that we don't |
| know about. */ |
| continue; |
| } |
| } |
| |
| case N_EXCL: |
| |
| namestring = set_namestring (objfile, &nlist); |
| |
| /* Find the corresponding bincl and mark that psymtab on the |
| psymtab dependency list. */ |
| { |
| legacy_psymtab *needed_pst = |
| find_corresponding_bincl_psymtab (namestring, nlist.n_value); |
| |
| /* If this include file was defined earlier in this file, |
| leave it alone. */ |
| if (needed_pst == pst) |
| continue; |
| |
| if (needed_pst) |
| { |
| int i; |
| int found = 0; |
| |
| for (i = 0; i < dependencies_used; i++) |
| if (dependency_list[i] == needed_pst) |
| { |
| found = 1; |
| break; |
| } |
| |
| /* If it's already in the list, skip the rest. */ |
| if (found) |
| continue; |
| |
| dependency_list[dependencies_used++] = needed_pst; |
| if (dependencies_used >= dependencies_allocated) |
| { |
| legacy_psymtab **orig = dependency_list; |
| |
| dependency_list = |
| (legacy_psymtab **) |
| alloca ((dependencies_allocated *= 2) |
| * sizeof (legacy_psymtab *)); |
| memcpy (dependency_list, orig, |
| (dependencies_used |
| * sizeof (legacy_psymtab *))); |
| #ifdef DEBUG_INFO |
| gdb_printf (gdb_stderr, |
| "Had to reallocate " |
| "dependency list.\n"); |
| gdb_printf (gdb_stderr, |
| "New dependencies allocated: %d\n", |
| dependencies_allocated); |
| #endif |
| } |
| } |
| } |
| continue; |
| |
| case N_ENDM: |
| /* Solaris 2 end of module, finish current partial symbol |
| table. dbx_end_psymtab will set the high text address of |
| PST to the proper value, which is necessary if a module |
| compiled without debugging info follows this module. */ |
| if (pst && gdbarch_sofun_address_maybe_missing (gdbarch)) |
| { |
| dbx_end_psymtab (objfile, partial_symtabs, pst, |
| psymtab_include_list, includes_used, |
| symnum * symbol_size, |
| (unrelocated_addr) 0, dependency_list, |
| dependencies_used, textlow_not_set); |
| pst = (legacy_psymtab *) 0; |
| includes_used = 0; |
| dependencies_used = 0; |
| has_line_numbers = 0; |
| } |
| continue; |
| |
| case N_RBRAC: |
| #ifdef HANDLE_RBRAC |
| HANDLE_RBRAC (nlist.n_value); |
| continue; |
| #endif |
| case N_EINCL: |
| case N_DSLINE: |
| case N_BSLINE: |
| case N_SSYM: /* Claim: Structure or union element. |
| Hopefully, I can ignore this. */ |
| case N_ENTRY: /* Alternate entry point; can ignore. */ |
| case N_MAIN: /* Can definitely ignore this. */ |
| case N_CATCH: /* These are GNU C++ extensions */ |
| case N_EHDECL: /* that can safely be ignored here. */ |
| case N_LENG: |
| case N_BCOMM: |
| case N_ECOMM: |
| case N_ECOML: |
| case N_FNAME: |
| case N_SLINE: |
| case N_RSYM: |
| case N_PSYM: |
| case N_BNSYM: |
| case N_ENSYM: |
| case N_LBRAC: |
| case N_NSYMS: /* Ultrix 4.0: symbol count */ |
| case N_DEFD: /* GNU Modula-2 */ |
| case N_ALIAS: /* SunPro F77: alias name, ignore for now. */ |
| |
| case N_OBJ: /* Useless types from Solaris. */ |
| case N_OPT: |
| case N_PATCH: |
| /* These symbols aren't interesting; don't worry about them. */ |
| continue; |
| |
| default: |
| /* If we haven't found it yet, ignore it. It's probably some |
| new type we don't know about yet. */ |
| unknown_symtype_complaint (hex_string (nlist.n_type)); |
| continue; |
| } |
| } |
| |
| /* If there's stuff to be cleaned up, clean it up. */ |
| if (pst) |
| { |
| /* Don't set high text address of PST lower than it already |
| is. */ |
| unrelocated_addr text_end |
| = (unrelocated_addr |
| ((lowest_text_address == (unrelocated_addr) -1 |
| ? text_addr |
| : CORE_ADDR (lowest_text_address)) |
| + text_size)); |
| |
| dbx_end_psymtab (objfile, partial_symtabs, |
| pst, psymtab_include_list, includes_used, |
| symnum * symbol_size, |
| (text_end > pst->unrelocated_text_high () |
| ? text_end : pst->unrelocated_text_high ()), |
| dependency_list, dependencies_used, textlow_not_set); |
| } |
| } |
| |
| /* Allocate and partially fill a partial symtab. It will be |
| completely filled at the end of the symbol list. |
| |
| SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR |
| is the address relative to which its symbols are (incremental) or 0 |
| (normal). */ |
| |
| static legacy_psymtab * |
| start_psymtab (psymtab_storage *partial_symtabs, struct objfile *objfile, |
| const char *filename, unrelocated_addr textlow, int ldsymoff) |
| { |
| legacy_psymtab *result = new legacy_psymtab (filename, partial_symtabs, |
| objfile->per_bfd, textlow); |
| |
| result->read_symtab_private = |
| XOBNEW (&objfile->objfile_obstack, struct symloc); |
| LDSYMOFF (result) = ldsymoff; |
| result->legacy_read_symtab = dbx_read_symtab; |
| result->legacy_expand_psymtab = dbx_expand_psymtab; |
| SYMBOL_SIZE (result) = symbol_size; |
| SYMBOL_OFFSET (result) = symbol_table_offset; |
| STRING_OFFSET (result) = string_table_offset; |
| FILE_STRING_OFFSET (result) = file_string_table_offset; |
| |
| /* Deduce the source language from the filename for this psymtab. */ |
| psymtab_language = deduce_language_from_filename (filename); |
| PST_LANGUAGE (result) = psymtab_language; |
| |
| return result; |
| } |
| |
| /* Close off the current usage of PST. |
| Returns PST or NULL if the partial symtab was empty and thrown away. |
| |
| FIXME: List variables and peculiarities of same. */ |
| |
| legacy_psymtab * |
| dbx_end_psymtab (struct objfile *objfile, psymtab_storage *partial_symtabs, |
| legacy_psymtab *pst, |
| const char **include_list, int num_includes, |
| int capping_symbol_offset, unrelocated_addr capping_text, |
| legacy_psymtab **dependency_list, |
| int number_dependencies, |
| int textlow_not_set) |
| { |
| int i; |
| struct gdbarch *gdbarch = objfile->arch (); |
| |
| if (capping_symbol_offset != -1) |
| LDSYMLEN (pst) = capping_symbol_offset - LDSYMOFF (pst); |
| pst->set_text_high (capping_text); |
| |
| /* Under Solaris, the N_SO symbols always have a value of 0, |
| instead of the usual address of the .o file. Therefore, |
| we have to do some tricks to fill in texthigh and textlow. |
| The first trick is: if we see a static |
| or global function, and the textlow for the current pst |
| is not set (ie: textlow_not_set), then we use that function's |
| address for the textlow of the pst. */ |
| |
| /* Now, to fill in texthigh, we remember the last function seen |
| in the .o file. Also, there's a hack in |
| bfd/elf.c and gdb/elfread.c to pass the ELF st_size field |
| to here via the misc_info field. Therefore, we can fill in |
| a reliable texthigh by taking the address plus size of the |
| last function in the file. */ |
| |
| if (!pst->text_high_valid && last_function_name |
| && gdbarch_sofun_address_maybe_missing (gdbarch)) |
| { |
| int n; |
| |
| const char *colon = strchr (last_function_name, ':'); |
| if (colon == NULL) |
| n = 0; |
| else |
| n = colon - last_function_name; |
| char *p = (char *) alloca (n + 2); |
| strncpy (p, last_function_name, n); |
| p[n] = 0; |
| |
| bound_minimal_symbol minsym |
| = lookup_minimal_symbol (current_program_space, p, objfile, |
| pst->filename); |
| if (minsym.minsym == NULL) |
| { |
| /* Sun Fortran appends an underscore to the minimal symbol name, |
| try again with an appended underscore if the minimal symbol |
| was not found. */ |
| p[n] = '_'; |
| p[n + 1] = 0; |
| minsym = lookup_minimal_symbol (current_program_space, p, objfile, |
| pst->filename); |
| } |
| |
| if (minsym.minsym) |
| pst->set_text_high |
| (unrelocated_addr (CORE_ADDR (minsym.minsym->unrelocated_address ()) |
| + minsym.minsym->size ())); |
| |
| last_function_name = NULL; |
| } |
| |
| if (!gdbarch_sofun_address_maybe_missing (gdbarch)) |
| ; |
| /* This test will be true if the last .o file is only data. */ |
| else if (textlow_not_set) |
| pst->set_text_low (pst->unrelocated_text_high ()); |
| else |
| { |
| /* If we know our own starting text address, then walk through all other |
| psymtabs for this objfile, and if any didn't know their ending text |
| address, set it to our starting address. Take care to not set our |
| own ending address to our starting address. */ |
| |
| for (partial_symtab *p1 : partial_symtabs->range ()) |
| if (!p1->text_high_valid && p1->text_low_valid && p1 != pst) |
| p1->set_text_high (pst->unrelocated_text_low ()); |
| } |
| |
| /* End of kludge for patching Solaris textlow and texthigh. */ |
| |
| pst->end (); |
| |
| pst->number_of_dependencies = number_dependencies; |
| if (number_dependencies) |
| { |
| pst->dependencies |
| = partial_symtabs->allocate_dependencies (number_dependencies); |
| memcpy (pst->dependencies, dependency_list, |
| number_dependencies * sizeof (legacy_psymtab *)); |
| } |
| else |
| pst->dependencies = 0; |
| |
| for (i = 0; i < num_includes; i++) |
| { |
| legacy_psymtab *subpst = |
| new legacy_psymtab (include_list[i], partial_symtabs, objfile->per_bfd); |
| |
| subpst->read_symtab_private = |
| XOBNEW (&objfile->objfile_obstack, struct symloc); |
| LDSYMOFF (subpst) = |
| LDSYMLEN (subpst) = 0; |
| |
| /* We could save slight bits of space by only making one of these, |
| shared by the entire set of include files. FIXME-someday. */ |
| subpst->dependencies = |
| partial_symtabs->allocate_dependencies (1); |
| subpst->dependencies[0] = pst; |
| subpst->number_of_dependencies = 1; |
| |
| subpst->legacy_read_symtab = pst->legacy_read_symtab; |
| subpst->legacy_expand_psymtab = pst->legacy_expand_psymtab; |
| } |
| |
| if (num_includes == 0 |
| && number_dependencies == 0 |
| && pst->empty () |
| && has_line_numbers == 0) |
| { |
| /* Throw away this psymtab, it's empty. */ |
| /* Empty psymtabs happen as a result of header files which don't have |
| any symbols in them. There can be a lot of them. But this check |
| is wrong, in that a psymtab with N_SLINE entries but nothing else |
| is not empty, but we don't realize that. Fixing that without slowing |
| things down might be tricky. */ |
| |
| partial_symtabs->discard_psymtab (pst); |
| |
| /* Indicate that psymtab was thrown away. */ |
| pst = NULL; |
| } |
| return pst; |
| } |
| |
| static void |
| dbx_expand_psymtab (legacy_psymtab *pst, struct objfile *objfile) |
| { |
| gdb_assert (!pst->readin); |
| |
| /* Read in all partial symtabs on which this one is dependent. */ |
| pst->expand_dependencies (objfile); |
| |
| if (LDSYMLEN (pst)) /* Otherwise it's a dummy. */ |
| { |
| /* Init stuff necessary for reading in symbols */ |
| stabsread_init (); |
| scoped_free_pendings free_pending; |
| file_string_table_offset = FILE_STRING_OFFSET (pst); |
| symbol_size = SYMBOL_SIZE (pst); |
| |
| /* Read in this file's symbols. */ |
| if (bfd_seek (objfile->obfd.get (), SYMBOL_OFFSET (pst), SEEK_SET) == 0) |
| read_ofile_symtab (objfile, pst); |
| } |
| |
| pst->readin = true; |
| } |
| |
| /* Read in all of the symbols for a given psymtab for real. |
| Be verbose about it if the user wants that. SELF is not NULL. */ |
| |
| static void |
| dbx_read_symtab (legacy_psymtab *self, struct objfile *objfile) |
| { |
| gdb_assert (!self->readin); |
| |
| if (LDSYMLEN (self) || self->number_of_dependencies) |
| { |
| next_symbol_text_func = dbx_next_symbol_text; |
| |
| { |
| scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data); |
| gdb::unique_xmalloc_ptr<gdb_byte> data_holder; |
| if (DBX_STAB_SECTION (objfile)) |
| { |
| stabs_data |
| = symfile_relocate_debug_section (objfile, |
| DBX_STAB_SECTION (objfile), |
| NULL); |
| data_holder.reset (stabs_data); |
| } |
| |
| self->expand_psymtab (objfile); |
| } |
| |
| /* Match with global symbols. This only needs to be done once, |
| after all of the symtabs and dependencies have been read in. */ |
| scan_file_globals (objfile); |
| } |
| } |
| |
| /* Read in a defined section of a specific object file's symbols. */ |
| |
| static void |
| read_ofile_symtab (struct objfile *objfile, legacy_psymtab *pst) |
| { |
| const char *namestring; |
| struct external_nlist *bufp; |
| struct internal_nlist nlist; |
| unsigned char type; |
| unsigned max_symnum; |
| bfd *abfd; |
| int sym_offset; /* Offset to start of symbols to read */ |
| int sym_size; /* Size of symbols to read */ |
| CORE_ADDR text_offset; /* Start of text segment for symbols */ |
| int text_size; /* Size of text segment for symbols */ |
| |
| sym_offset = LDSYMOFF (pst); |
| sym_size = LDSYMLEN (pst); |
| text_offset = pst->text_low (objfile); |
| text_size = pst->text_high (objfile) - pst->text_low (objfile); |
| const section_offsets §ion_offsets = objfile->section_offsets; |
| |
| dbxread_objfile = objfile; |
| |
| stringtab_global = DBX_STRINGTAB (objfile); |
| set_last_source_file (NULL); |
| |
| abfd = objfile->obfd.get (); |
| symfile_bfd = objfile->obfd.get (); /* Implicit param to next_text_symbol. */ |
| symbuf_end = symbuf_idx = 0; |
| symbuf_read = 0; |
| symbuf_left = sym_offset + sym_size; |
| |
| /* It is necessary to actually read one symbol *before* the start |
| of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL |
| occurs before the N_SO symbol. |
| |
| Detecting this in read_dbx_symtab |
| would slow down initial readin, so we look for it here instead. */ |
| if (!processing_acc_compilation && sym_offset >= (int) symbol_size) |
| { |
| stabs_seek (sym_offset - symbol_size); |
| fill_symbuf (abfd); |
| bufp = &symbuf[symbuf_idx++]; |
| INTERNALIZE_SYMBOL (nlist, bufp, abfd); |
| OBJSTAT (objfile, n_stabs++); |
| |
| namestring = set_namestring (objfile, &nlist); |
| |
| processing_gcc_compilation = 0; |
| if (nlist.n_type == N_TEXT) |
| { |
| const char *tempstring = namestring; |
| |
| if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0) |
| processing_gcc_compilation = 1; |
| else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0) |
| processing_gcc_compilation = 2; |
| if (*tempstring != '\0' |
| && *tempstring == bfd_get_symbol_leading_char (symfile_bfd)) |
| ++tempstring; |
| if (startswith (tempstring, "__gnu_compiled")) |
| processing_gcc_compilation = 2; |
| } |
| } |
| else |
| { |
| /* The N_SO starting this symtab is the first symbol, so we |
| better not check the symbol before it. I'm not this can |
| happen, but it doesn't hurt to check for it. */ |
| stabs_seek (sym_offset); |
| processing_gcc_compilation = 0; |
| } |
| |
| if (symbuf_idx == symbuf_end) |
| fill_symbuf (abfd); |
| bufp = &symbuf[symbuf_idx]; |
| if (bfd_h_get_8 (abfd, bufp->e_type) != N_SO) |
| error (_("First symbol in segment of executable not a source symbol")); |
| |
| max_symnum = sym_size / symbol_size; |
| |
| for (symnum = 0; |
| symnum < max_symnum; |
| symnum++) |
| { |
| QUIT; /* Allow this to be interruptable. */ |
| if (symbuf_idx == symbuf_end) |
| fill_symbuf (abfd); |
| bufp = &symbuf[symbuf_idx++]; |
| INTERNALIZE_SYMBOL (nlist, bufp, abfd); |
| OBJSTAT (objfile, n_stabs++); |
| |
| type = bfd_h_get_8 (abfd, bufp->e_type); |
| |
| namestring = set_namestring (objfile, &nlist); |
| |
| if (type & N_STAB) |
| { |
| if (sizeof (nlist.n_value) > 4 |
| /* We are a 64-bit debugger debugging a 32-bit program. */ |
| && (type == N_LSYM || type == N_PSYM)) |
| /* We have to be careful with the n_value in the case of N_LSYM |
| and N_PSYM entries, because they are signed offsets from frame |
| pointer, but we actually read them as unsigned 32-bit values. |
| This is not a problem for 32-bit debuggers, for which negative |
| values end up being interpreted correctly (as negative |
| offsets) due to integer overflow. |
| But we need to sign-extend the value for 64-bit debuggers, |
| or we'll end up interpreting negative values as very large |
| positive offsets. */ |
| nlist.n_value = (nlist.n_value ^ 0x80000000) - 0x80000000; |
| process_one_symbol (type, nlist.n_desc, nlist.n_value, |
| namestring, section_offsets, objfile, |
| PST_LANGUAGE (pst)); |
| } |
| /* We skip checking for a new .o or -l file; that should never |
| happen in this routine. */ |
| else if (type == N_TEXT) |
| { |
| /* I don't think this code will ever be executed, because |
| the GCC_COMPILED_FLAG_SYMBOL usually is right before |
| the N_SO symbol which starts this source file. |
| However, there is no reason not to accept |
| the GCC_COMPILED_FLAG_SYMBOL anywhere. */ |
| |
| if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0) |
| processing_gcc_compilation = 1; |
| else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0) |
| processing_gcc_compilation = 2; |
| } |
| else if (type & N_EXT || type == (unsigned char) N_TEXT |
| || type == (unsigned char) N_NBTEXT) |
| { |
| /* Global symbol: see if we came across a dbx definition for |
| a corresponding symbol. If so, store the value. Remove |
| syms from the chain when their values are stored, but |
| search the whole chain, as there may be several syms from |
| different files with the same name. */ |
| /* This is probably not true. Since the files will be read |
| in one at a time, each reference to a global symbol will |
| be satisfied in each file as it appears. So we skip this |
| section. */ |
| ; |
| } |
| } |
| |
| /* In a Solaris elf file, this variable, which comes from the value |
| of the N_SO symbol, will still be 0. Luckily, text_offset, which |
| comes from low text address of PST, is correct. */ |
| if (get_last_source_start_addr () == 0) |
| set_last_source_start_addr (text_offset); |
| |
| /* In reordered executables last_source_start_addr may not be the |
| lower bound for this symtab, instead use text_offset which comes |
| from the low text address of PST, which is correct. */ |
| if (get_last_source_start_addr () > text_offset) |
| set_last_source_start_addr (text_offset); |
| |
| pst->compunit_symtab = end_compunit_symtab (text_offset + text_size); |
| |
| end_stabs (); |
| |
| dbxread_objfile = NULL; |
| } |
| |
| |
| /* Record the namespace that the function defined by SYMBOL was |
| defined in, if necessary. BLOCK is the associated block; use |
| OBSTACK for allocation. */ |
| |
| static void |
| cp_set_block_scope (const struct symbol *symbol, |
| struct block *block, |
| struct obstack *obstack) |
| { |
| if (symbol->demangled_name () != NULL) |
| { |
| /* Try to figure out the appropriate namespace from the |
| demangled name. */ |
| |
| /* FIXME: carlton/2003-04-15: If the function in question is |
| a method of a class, the name will actually include the |
| name of the class as well. This should be harmless, but |
| is a little unfortunate. */ |
| |
| const char *name = symbol->demangled_name (); |
| unsigned int prefix_len = cp_entire_prefix_len (name); |
| |
| block->set_scope (obstack_strndup (obstack, name, prefix_len), |
| obstack); |
| } |
| } |
| |
| /* This handles a single symbol from the symbol-file, building symbols |
| into a GDB symtab. It takes these arguments and an implicit argument. |
| |
| TYPE is the type field of the ".stab" symbol entry. |
| DESC is the desc field of the ".stab" entry. |
| VALU is the value field of the ".stab" entry. |
| NAME is the symbol name, in our address space. |
| SECTION_OFFSETS is a set of amounts by which the sections of this |
| object file were relocated when it was loaded into memory. Note |
| that these section_offsets are not the objfile->section_offsets but |
| the pst->section_offsets. All symbols that refer to memory |
| locations need to be offset by these amounts. |
| OBJFILE is the object file from which we are reading symbols. It |
| is used in end_compunit_symtab. |
| LANGUAGE is the language of the symtab. |
| */ |
| |
| void |
| process_one_symbol (int type, int desc, CORE_ADDR valu, const char *name, |
| const section_offsets §ion_offsets, |
| struct objfile *objfile, enum language language) |
| { |
| struct gdbarch *gdbarch = objfile->arch (); |
| struct context_stack *newobj; |
| struct context_stack cstk; |
| /* This remembers the address of the start of a function. It is |
| used because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries |
| are relative to the current function's start address. On systems |
| other than Solaris 2, this just holds the SECT_OFF_TEXT value, |
| and is used to relocate these symbol types rather than |
| SECTION_OFFSETS. */ |
| static CORE_ADDR function_start_offset; |
| |
| /* This holds the address of the start of a function, without the |
| system peculiarities of function_start_offset. */ |
| static CORE_ADDR last_function_start; |
| |
| /* If this is nonzero, we've seen an N_SLINE since the start of the |
| current function. We use this to tell us to move the first sline |
| to the beginning of the function regardless of what its given |
| value is. */ |
| static int sline_found_in_function = 1; |
| |
| /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this |
| source file. Used to detect the SunPRO solaris compiler. */ |
| static int n_opt_found; |
| |
| /* The section index for this symbol. */ |
| int section_index = -1; |
| |
| /* Something is wrong if we see real data before seeing a source |
| file name. */ |
| |
| if (get_last_source_file () == NULL && type != (unsigned char) N_SO) |
| { |
| /* Ignore any symbols which appear before an N_SO symbol. |
| Currently no one puts symbols there, but we should deal |
| gracefully with the case. A complain()t might be in order, |
| but this should not be an error (). */ |
| return; |
| } |
| |
| switch (type) |
| { |
| case N_FUN: |
| case N_FNAME: |
| |
| if (*name == '\000') |
| { |
| /* This N_FUN marks the end of a function. This closes off |
| the current block. */ |
| struct block *block; |
| |
| if (outermost_context_p ()) |
| { |
| lbrac_mismatch_complaint (symnum); |
| break; |
| } |
| |
| /* The following check is added before recording line 0 at |
| end of function so as to handle hand-generated stabs |
| which may have an N_FUN stabs at the end of the function, |
| but no N_SLINE stabs. */ |
| if (sline_found_in_function) |
| { |
| CORE_ADDR addr = last_function_start + valu; |
| |
| record_line |
| (get_current_subfile (), 0, |
| unrelocated_addr (gdbarch_addr_bits_remove (gdbarch, addr) |
| - objfile->text_section_offset ())); |
| } |
| |
| within_function = 0; |
| cstk = pop_context (); |
| |
| /* Make a block for the local symbols within. */ |
| block = finish_block (cstk.name, |
| cstk.old_blocks, NULL, |
| cstk.start_addr, cstk.start_addr + valu); |
| |
| /* For C++, set the block's scope. */ |
| if (cstk.name->language () == language_cplus) |
| cp_set_block_scope (cstk.name, block, &objfile->objfile_obstack); |
| |
| /* May be switching to an assembler file which may not be using |
| block relative stabs, so reset the offset. */ |
| function_start_offset = 0; |
| |
| break; |
| } |
| |
| sline_found_in_function = 0; |
| |
| /* Relocate for dynamic loading. */ |
| section_index = SECT_OFF_TEXT (objfile); |
| valu += section_offsets[SECT_OFF_TEXT (objfile)]; |
| valu = gdbarch_addr_bits_remove (gdbarch, valu); |
| last_function_start = valu; |
| |
| goto define_a_symbol; |
| |
| case N_LBRAC: |
| /* This "symbol" just indicates the start of an inner lexical |
| context within a function. */ |
| |
| /* Ignore extra outermost context from SunPRO cc and acc. */ |
| if (n_opt_found && desc == 1) |
| break; |
| |
| valu += function_start_offset; |
| |
| push_context (desc, valu); |
| break; |
| |
| case N_RBRAC: |
| /* This "symbol" just indicates the end of an inner lexical |
| context that was started with N_LBRAC. */ |
| |
| /* Ignore extra outermost context from SunPRO cc and acc. */ |
| if (n_opt_found && desc == 1) |
| break; |
| |
| valu += function_start_offset; |
| |
| if (outermost_context_p ()) |
| { |
| lbrac_mismatch_complaint (symnum); |
| break; |
| } |
| |
| cstk = pop_context (); |
| if (desc != cstk.depth) |
| lbrac_mismatch_complaint (symnum); |
| |
| if (*get_local_symbols () != NULL) |
| { |
| /* GCC development snapshots from March to December of |
| 2000 would output N_LSYM entries after N_LBRAC |
| entries. As a consequence, these symbols are simply |
| discarded. Complain if this is the case. */ |
| complaint (_("misplaced N_LBRAC entry; discarding local " |
| "symbols which have no enclosing block")); |
| } |
| *get_local_symbols () = cstk.locals; |
| |
| if (get_context_stack_depth () > 1) |
| { |
| /* This is not the outermost LBRAC...RBRAC pair in the |
| function, its local symbols preceded it, and are the ones |
| just recovered from the context stack. Define the block |
| for them (but don't bother if the block contains no |
| symbols. Should we complain on blocks without symbols? |
| I can't think of any useful purpose for them). */ |
| if (*get_local_symbols () != NULL) |
| { |
| /* Muzzle a compiler bug that makes end < start. |
| |
| ??? Which compilers? Is this ever harmful?. */ |
| if (cstk.start_addr > valu) |
| { |
| complaint (_("block start larger than block end")); |
| cstk.start_addr = valu; |
| } |
| /* Make a block for the local symbols within. */ |
| finish_block (0, cstk.old_blocks, NULL, |
| cstk.start_addr, valu); |
| } |
| } |
| else |
| { |
| /* This is the outermost LBRAC...RBRAC pair. There is no |
| need to do anything; leave the symbols that preceded it |
| to be attached to the function's own block. We need to |
| indicate that we just moved outside of the function. */ |
| within_function = 0; |
| } |
| |
| break; |
| |
| case N_FN: |
| case N_FN_SEQ: |
| /* This kind of symbol indicates the start of an object file. |
| Relocate for dynamic loading. */ |
| section_index = SECT_OFF_TEXT (objfile); |
| valu += section_offsets[SECT_OFF_TEXT (objfile)]; |
| break; |
| |
| case N_SO: |
| /* This type of symbol indicates the start of data for one |
| source file. Finish the symbol table of the previous source |
| file (if any) and start accumulating a new symbol table. |
| Relocate for dynamic loading. */ |
| section_index = SECT_OFF_TEXT (objfile); |
| valu += section_offsets[SECT_OFF_TEXT (objfile)]; |
| |
| n_opt_found = 0; |
| |
| if (get_last_source_file ()) |
| { |
| /* Check if previous symbol was also an N_SO (with some |
| sanity checks). If so, that one was actually the |
| directory name, and the current one is the real file |
| name. Patch things up. */ |
| if (previous_stab_code == (unsigned char) N_SO) |
| { |
| patch_subfile_names (get_current_subfile (), name); |
| break; /* Ignore repeated SOs. */ |
| } |
| end_compunit_symtab (valu); |
| end_stabs (); |
| } |
| |
| /* Null name means this just marks the end of text for this .o |
| file. Don't start a new symtab in this case. */ |
| if (*name == '\000') |
| break; |
| |
| function_start_offset = 0; |
| |
| start_stabs (); |
| start_compunit_symtab (objfile, name, NULL, valu, language); |
| record_debugformat ("stabs"); |
| break; |
| |
| case N_SOL: |
| /* This type of symbol indicates the start of data for a |
| sub-source-file, one whose contents were copied or included |
| in the compilation of the main source file (whose name was |
| given in the N_SO symbol). Relocate for dynamic loading. */ |
| section_index = SECT_OFF_TEXT (objfile); |
| valu += section_offsets[SECT_OFF_TEXT (objfile)]; |
| start_subfile (name); |
| break; |
| |
| case N_BINCL: |
| push_subfile (); |
| add_new_header_file (name, valu); |
| start_subfile (name); |
| break; |
| |
| case N_EINCL: |
| start_subfile (pop_subfile ()); |
| break; |
| |
| case N_EXCL: |
| add_old_header_file (name, valu); |
| break; |
| |
| case N_SLINE: |
| /* This type of "symbol" really just records one line-number -- |
| core-address correspondence. Enter it in the line list for |
| this symbol table. */ |
| |
| /* Relocate for dynamic loading and for ELF acc |
| function-relative symbols. */ |
| valu += function_start_offset; |
| |
| /* GCC 2.95.3 emits the first N_SLINE stab somewhere in the |
| middle of the prologue instead of right at the start of the |
| function. To deal with this we record the address for the |
| first N_SLINE stab to be the start of the function instead of |
| the listed location. We really shouldn't to this. When |
| compiling with optimization, this first N_SLINE stab might be |
| optimized away. Other (non-GCC) compilers don't emit this |
| stab at all. There is no real harm in having an extra |
| numbered line, although it can be a bit annoying for the |
| user. However, it totally screws up our testsuite. |
| |
| So for now, keep adjusting the address of the first N_SLINE |
| stab, but only for code compiled with GCC. */ |
| |
| if (within_function && sline_found_in_function == 0) |
| { |
| CORE_ADDR addr = processing_gcc_compilation == 2 ? |
| last_function_start : valu; |
| |
| record_line |
| (get_current_subfile (), desc, |
| unrelocated_addr (gdbarch_addr_bits_remove (gdbarch, addr) |
| - objfile->text_section_offset ())); |
| sline_found_in_function = 1; |
| } |
| else |
| record_line |
| (get_current_subfile (), desc, |
| unrelocated_addr (gdbarch_addr_bits_remove (gdbarch, valu) |
| - objfile->text_section_offset ())); |
| break; |
| |
| case N_BCOMM: |
| common_block_start (name, objfile); |
| break; |
| |
| case N_ECOMM: |
| common_block_end (objfile); |
| break; |
| |
| /* The following symbol types need to have the appropriate |
| offset added to their value; then we process symbol |
| definitions in the name. */ |
| |
| case N_STSYM: /* Static symbol in data segment. */ |
| case N_LCSYM: /* Static symbol in BSS segment. */ |
| case N_ROSYM: /* Static symbol in read-only data segment. */ |
| /* HORRID HACK DEPT. However, it's Sun's furgin' fault. |
| Solaris 2's stabs-in-elf makes *most* symbols relative but |
| leaves a few absolute (at least for Solaris 2.1 and version |
| 2.0.1 of the SunPRO compiler). N_STSYM and friends sit on |
| the fence. .stab "foo:S...",N_STSYM is absolute (ld |
| relocates it) .stab "foo:V...",N_STSYM is relative (section |
| base subtracted). This leaves us no choice but to search for |
| the 'S' or 'V'... (or pass the whole section_offsets stuff |
| down ONE MORE function call level, which we really don't want |
| to do). */ |
| { |
| const char *p; |
| |
| /* Normal object file and NLMs have non-zero text seg offsets, |
| but don't need their static syms offset in this fashion. |
| XXX - This is really a crock that should be fixed in the |
| solib handling code so that I don't have to work around it |
| here. */ |
| |
| if (!symfile_relocatable) |
| { |
| p = strchr (name, ':'); |
| if (p != 0 && p[1] == 'S') |
| { |
| /* The linker relocated it. We don't want to add a |
| Sun-stabs Tfoo.foo-like offset, but we *do* |
| want to add whatever solib.c passed to |
| symbol_file_add as addr (this is known to affect |
| SunOS 4, and I suspect ELF too). Since there is no |
| Ttext.text symbol, we can get addr from the text offset. */ |
| section_index = SECT_OFF_TEXT (objfile); |
| valu += section_offsets[SECT_OFF_TEXT (objfile)]; |
| goto define_a_symbol; |
| } |
| } |
| /* Since it's not the kludge case, re-dispatch to the right |
| handler. */ |
| switch (type) |
| { |
| case N_STSYM: |
| goto case_N_STSYM; |
| case N_LCSYM: |
| goto case_N_LCSYM; |
| case N_ROSYM: |
| goto case_N_ROSYM; |
| default: |
| internal_error (_("failed internal consistency check")); |
| } |
| } |
| |
| case_N_STSYM: /* Static symbol in data segment. */ |
| case N_DSLINE: /* Source line number, data segment. */ |
| section_index = SECT_OFF_DATA (objfile); |
| valu += section_offsets[SECT_OFF_DATA (objfile)]; |
| goto define_a_symbol; |
| |
| case_N_LCSYM: /* Static symbol in BSS segment. */ |
| case N_BSLINE: /* Source line number, BSS segment. */ |
| /* N_BROWS: overlaps with N_BSLINE. */ |
| section_index = SECT_OFF_BSS (objfile); |
| valu += section_offsets[SECT_OFF_BSS (objfile)]; |
| goto define_a_symbol; |
| |
| case_N_ROSYM: /* Static symbol in read-only data segment. */ |
| section_index = SECT_OFF_RODATA (objfile); |
| valu += section_offsets[SECT_OFF_RODATA (objfile)]; |
| goto define_a_symbol; |
| |
| case N_ENTRY: /* Alternate entry point. */ |
| /* Relocate for dynamic loading. */ |
| section_index = SECT_OFF_TEXT (objfile); |
| valu += section_offsets[SECT_OFF_TEXT (objfile)]; |
| goto define_a_symbol; |
| |
| /* The following symbol types we don't know how to process. |
| Handle them in a "default" way, but complain to people who |
| care. */ |
| default: |
| case N_CATCH: /* Exception handler catcher. */ |
| case N_EHDECL: /* Exception handler name. */ |
| case N_PC: /* Global symbol in Pascal. */ |
| case N_M2C: /* Modula-2 compilation unit. */ |
| /* N_MOD2: overlaps with N_EHDECL. */ |
| case N_SCOPE: /* Modula-2 scope information. */ |
| case N_ECOML: /* End common (local name). */ |
| case N_NBTEXT: /* Gould Non-Base-Register symbols??? */ |
| case N_NBDATA: |
| case N_NBBSS: |
| case N_NBSTS: |
| case N_NBLCS: |
| unknown_symtype_complaint (hex_string (type)); |
| |
| define_a_symbol: |
| [[fallthrough]]; |
| /* These symbol types don't need the address field relocated, |
| since it is either unused, or is absolute. */ |
| case N_GSYM: /* Global variable. */ |
| case N_NSYMS: /* Number of symbols (Ultrix). */ |
| case N_NOMAP: /* No map? (Ultrix). */ |
| case N_RSYM: /* Register variable. */ |
| case N_DEFD: /* Modula-2 GNU module dependency. */ |
| case N_SSYM: /* Struct or union element. */ |
| case N_LSYM: /* Local symbol in stack. */ |
| case N_PSYM: /* Parameter variable. */ |
| case N_LENG: /* Length of preceding symbol type. */ |
| if (name) |
| { |
| int deftype; |
| const char *colon_pos = strchr (name, ':'); |
| |
| if (colon_pos == NULL) |
| deftype = '\0'; |
| else |
| deftype = colon_pos[1]; |
| |
| switch (deftype) |
| { |
| case 'f': |
| case 'F': |
| /* Deal with the SunPRO 3.0 compiler which omits the |
| address from N_FUN symbols. */ |
| if (type == N_FUN |
| && valu == section_offsets[SECT_OFF_TEXT (objfile)] |
| && gdbarch_sofun_address_maybe_missing (gdbarch)) |
| { |
| bound_minimal_symbol minsym |
| = find_stab_function (name, get_last_source_file (), |
| objfile); |
| if (minsym.minsym != NULL) |
| valu = minsym.value_address (); |
| } |
| |
| /* These addresses are absolute. */ |
| function_start_offset = valu; |
| |
| within_function = 1; |
| |
| if (get_context_stack_depth () > 1) |
| { |
| complaint (_("unmatched N_LBRAC before symtab pos %d"), |
| symnum); |
| break; |
| } |
| |
| if (!outermost_context_p ()) |
| { |
| struct block *block; |
| |
| cstk = pop_context (); |
| /* Make a block for the local symbols within. */ |
| block = finish_block (cstk.name, |
| cstk.old_blocks, NULL, |
| cstk.start_addr, valu); |
| |
| /* For C++, set the block's scope. */ |
| if (cstk.name->language () == language_cplus) |
| cp_set_block_scope (cstk.name, block, |
| &objfile->objfile_obstack); |
| } |
| |
| newobj = push_context (0, valu); |
| newobj->name = define_symbol (valu, name, desc, type, objfile); |
| if (newobj->name != nullptr) |
| newobj->name->set_section_index (section_index); |
| break; |
| |
| default: |
| { |
| struct symbol *sym = define_symbol (valu, name, desc, type, |
| objfile); |
| if (sym != nullptr) |
| sym->set_section_index (section_index); |
| } |
| break; |
| } |
| } |
| break; |
| |
| /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it |
| for a bunch of other flags, too. Someday we may parse their |
| flags; for now we ignore theirs and hope they'll ignore ours. */ |
| case N_OPT: /* Solaris 2: Compiler options. */ |
| if (name) |
| { |
| if (strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0) |
| { |
| processing_gcc_compilation = 2; |
| } |
| else |
| n_opt_found = 1; |
| } |
| break; |
| |
| case N_MAIN: /* Name of main routine. */ |
| /* FIXME: If one has a symbol file with N_MAIN and then replaces |
| it with a symbol file with "main" and without N_MAIN. I'm |
| not sure exactly what rule to follow but probably something |
| like: N_MAIN takes precedence over "main" no matter what |
| objfile it is in; If there is more than one N_MAIN, choose |
| the one in the symfile_objfile; If there is more than one |
| N_MAIN within a given objfile, complain() and choose |
| arbitrarily. (kingdon) */ |
| if (name != NULL) |
| set_objfile_main_name (objfile, name, language_unknown); |
| break; |
| |
| /* The following symbol types can be ignored. */ |
| case N_OBJ: /* Solaris 2: Object file dir and name. */ |
| case N_PATCH: /* Solaris 2: Patch Run Time Checker. */ |
| /* N_UNDF: Solaris 2: File separator mark. */ |
| /* N_UNDF: -- we will never encounter it, since we only process |
| one file's symbols at once. */ |
| case N_ENDM: /* Solaris 2: End of module. */ |
| case N_ALIAS: /* SunPro F77: alias name, ignore for now. */ |
| break; |
| } |
| |
| /* '#' is a GNU C extension to allow one symbol to refer to another |
| related symbol. |
| |
| Generally this is used so that an alias can refer to its main |
| symbol. */ |
| gdb_assert (name); |
| if (name[0] == '#') |
| { |
| /* Initialize symbol reference names and determine if this is a |
| definition. If a symbol reference is being defined, go ahead |
| and add it. Otherwise, just return. */ |
| |
| const char *s = name; |
| int refnum; |
| |
| /* If this stab defines a new reference ID that is not on the |
| reference list, then put it on the reference list. |
| |
| We go ahead and advance NAME past the reference, even though |
| it is not strictly necessary at this time. */ |
| refnum = symbol_reference_defined (&s); |
| if (refnum >= 0) |
| if (!ref_search (refnum)) |
| ref_add (refnum, 0, name, valu); |
| name = s; |
| } |
| |
| previous_stab_code = type; |
| } |
| |
| /* FIXME: The only difference between this and elfstab_build_psymtabs |
| is the call to install_minimal_symbols for elf, and the support for |
| split sections. If the differences are really that small, the code |
| should be shared. */ |
| |
| /* Scan and build partial symbols for an coff symbol file. |
| The coff file has already been processed to get its minimal symbols. |
| |
| This routine is the equivalent of dbx_symfile_init and dbx_symfile_read |
| rolled into one. |
| |
| OBJFILE is the object file we are reading symbols from. |
| ADDR is the address relative to which the symbols are (e.g. |
| the base address of the text segment). |
| TEXTADDR is the address of the text section. |
| TEXTSIZE is the size of the text section. |
| STABSECTS is the list of .stab sections in OBJFILE. |
| STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the |
| .stabstr section exists. |
| |
| This routine is mostly copied from dbx_symfile_init and dbx_symfile_read, |
| adjusted for coff details. */ |
| |
| void |
| coffstab_build_psymtabs (struct objfile *objfile, |
| CORE_ADDR textaddr, unsigned int textsize, |
| const std::vector<asection *> &stabsects, |
| file_ptr stabstroffset, unsigned int stabstrsize) |
| { |
| int val; |
| bfd *sym_bfd = objfile->obfd.get (); |
| const char *name = bfd_get_filename (sym_bfd); |
| unsigned int stabsize; |
| |
| /* Allocate struct to keep track of stab reading. */ |
| dbx_objfile_data_key.emplace (objfile); |
| |
| DBX_TEXT_ADDR (objfile) = textaddr; |
| DBX_TEXT_SIZE (objfile) = textsize; |
| |
| #define COFF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */ |
| DBX_SYMBOL_SIZE (objfile) = COFF_STABS_SYMBOL_SIZE; |
| DBX_STRINGTAB_SIZE (objfile) = stabstrsize; |
| |
| if (stabstrsize > bfd_get_size (sym_bfd)) |
| error (_("ridiculous string table size: %d bytes"), stabstrsize); |
| DBX_STRINGTAB (objfile) = (char *) |
| obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1); |
| OBJSTAT (objfile, sz_strtab += stabstrsize + 1); |
| |
| /* Now read in the string table in one big gulp. */ |
| |
| val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET); |
| if (val < 0) |
| perror_with_name (name); |
| val = bfd_read (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd); |
| if (val != stabstrsize) |
| perror_with_name (name); |
| |
| stabsread_new_init (); |
| free_header_files (); |
| init_header_files (); |
| |
| processing_acc_compilation = 1; |
| |
| /* In a coff file, we've already installed the minimal symbols that came |
| from the coff (non-stab) symbol table, so always act like an |
| incremental load here. */ |
| scoped_restore save_symbuf_sections |
| = make_scoped_restore (&symbuf_sections); |
| if (stabsects.size () == 1) |
| { |
| stabsize = bfd_section_size (stabsects[0]); |
| DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile); |
| DBX_SYMTAB_OFFSET (objfile) = stabsects[0]->filepos; |
| } |
| else |
| { |
| DBX_SYMCOUNT (objfile) = 0; |
| for (asection *section : stabsects) |
| { |
| stabsize = bfd_section_size (section); |
| DBX_SYMCOUNT (objfile) += stabsize / DBX_SYMBOL_SIZE (objfile); |
| } |
| |
| DBX_SYMTAB_OFFSET (objfile) = stabsects[0]->filepos; |
| |
| sect_idx = 1; |
| symbuf_sections = &stabsects; |
| symbuf_left = bfd_section_size (stabsects[0]); |
| symbuf_read = 0; |
| } |
| |
| dbx_symfile_read (objfile, 0); |
| } |
| |
| /* Scan and build partial symbols for an ELF symbol file. |
| This ELF file has already been processed to get its minimal symbols. |
| |
| This routine is the equivalent of dbx_symfile_init and dbx_symfile_read |
| rolled into one. |
| |
| OBJFILE is the object file we are reading symbols from. |
| ADDR is the address relative to which the symbols are (e.g. |
| the base address of the text segment). |
| STABSECT is the BFD section information for the .stab section. |
| STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the |
| .stabstr section exists. |
| |
| This routine is mostly copied from dbx_symfile_init and dbx_symfile_read, |
| adjusted for elf details. */ |
| |
| void |
| elfstab_build_psymtabs (struct objfile *objfile, asection *stabsect, |
| file_ptr stabstroffset, unsigned int stabstrsize) |
| { |
| int val; |
| bfd *sym_bfd = objfile->obfd.get (); |
| const char *name = bfd_get_filename (sym_bfd); |
| |
| stabsread_new_init (); |
| |
| /* Allocate struct to keep track of stab reading. */ |
| dbx_objfile_data_key.emplace (objfile); |
| |
| /* Find the first and last text address. dbx_symfile_read seems to |
| want this. */ |
| find_text_range (sym_bfd, objfile); |
| |
| #define ELF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */ |
| DBX_SYMBOL_SIZE (objfile) = ELF_STABS_SYMBOL_SIZE; |
| DBX_SYMCOUNT (objfile) |
| = bfd_section_size (stabsect) / DBX_SYMBOL_SIZE (objfile); |
| DBX_STRINGTAB_SIZE (objfile) = stabstrsize; |
| DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; |
| DBX_STAB_SECTION (objfile) = stabsect; |
| |
| if (stabstrsize > bfd_get_size (sym_bfd)) |
| error (_("ridiculous string table size: %d bytes"), stabstrsize); |
| DBX_STRINGTAB (objfile) = (char *) |
| obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1); |
| OBJSTAT (objfile, sz_strtab += stabstrsize + 1); |
| |
| /* Now read in the string table in one big gulp. */ |
| |
| val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET); |
| if (val < 0) |
| perror_with_name (name); |
| val = bfd_read (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd); |
| if (val != stabstrsize) |
| perror_with_name (name); |
| |
| stabsread_new_init (); |
| free_header_files (); |
| init_header_files (); |
| |
| processing_acc_compilation = 1; |
| |
| symbuf_read = 0; |
| symbuf_left = bfd_section_size (stabsect); |
| |
| scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data); |
| gdb::unique_xmalloc_ptr<gdb_byte> data_holder; |
| |
| stabs_data = symfile_relocate_debug_section (objfile, stabsect, NULL); |
| if (stabs_data) |
| data_holder.reset (stabs_data); |
| |
| /* In an elf file, we've already installed the minimal symbols that came |
| from the elf (non-stab) symbol table, so always act like an |
| incremental load here. dbx_symfile_read should not generate any new |
| minimal symbols, since we will have already read the ELF dynamic symbol |
| table and normal symbol entries won't be in the ".stab" section; but in |
| case it does, it will install them itself. */ |
| dbx_symfile_read (objfile, 0); |
| } |
| |
| /* Scan and build partial symbols for a file with special sections for stabs |
| and stabstrings. The file has already been processed to get its minimal |
| symbols, and any other symbols that might be necessary to resolve GSYMs. |
| |
| This routine is the equivalent of dbx_symfile_init and dbx_symfile_read |
| rolled into one. |
| |
| OBJFILE is the object file we are reading symbols from. |
| ADDR is the address relative to which the symbols are (e.g. the base address |
| of the text segment). |
| STAB_NAME is the name of the section that contains the stabs. |
| STABSTR_NAME is the name of the section that contains the stab strings. |
| |
| This routine is mostly copied from dbx_symfile_init and |
| dbx_symfile_read. */ |
| |
| void |
| stabsect_build_psymtabs (struct objfile *objfile, char *stab_name, |
| char *stabstr_name, char *text_name) |
| { |
| int val; |
| bfd *sym_bfd = objfile->obfd.get (); |
| const char *name = bfd_get_filename (sym_bfd); |
| asection *stabsect; |
| asection *stabstrsect; |
| asection *text_sect; |
| |
| stabsect = bfd_get_section_by_name (sym_bfd, stab_name); |
| stabstrsect = bfd_get_section_by_name (sym_bfd, stabstr_name); |
| |
| if (!stabsect) |
| return; |
| |
| if (!stabstrsect) |
| error (_("stabsect_build_psymtabs: Found stabs (%s), " |
| "but not string section (%s)"), |
| stab_name, stabstr_name); |
| |
| dbx_objfile_data_key.emplace (objfile); |
| |
| text_sect = bfd_get_section_by_name (sym_bfd, text_name); |
| if (!text_sect) |
| error (_("Can't find %s section in symbol file"), text_name); |
| DBX_TEXT_ADDR (objfile) = bfd_section_vma (text_sect); |
| DBX_TEXT_SIZE (objfile) = bfd_section_size (text_sect); |
| |
| DBX_SYMBOL_SIZE (objfile) = sizeof (struct external_nlist); |
| DBX_SYMCOUNT (objfile) = bfd_section_size (stabsect) |
| / DBX_SYMBOL_SIZE (objfile); |
| DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (stabstrsect); |
| DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; /* XXX - FIXME: POKING |
| INSIDE BFD DATA |
| STRUCTURES */ |
| |
| if (DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) |
| error (_("ridiculous string table size: %d bytes"), |
| DBX_STRINGTAB_SIZE (objfile)); |
| DBX_STRINGTAB (objfile) = (char *) |
| obstack_alloc (&objfile->objfile_obstack, |
| DBX_STRINGTAB_SIZE (objfile) + 1); |
| OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile) + 1); |
| |
| /* Now read in the string table in one big gulp. */ |
| |
| val = bfd_get_section_contents (sym_bfd, /* bfd */ |
| stabstrsect, /* bfd section */ |
| DBX_STRINGTAB (objfile), /* input buffer */ |
| 0, /* offset into section */ |
| DBX_STRINGTAB_SIZE (objfile)); /* amount to |
| read */ |
| |
| if (!val) |
| perror_with_name (name); |
| |
| stabsread_new_init (); |
| free_header_files (); |
| init_header_files (); |
| |
| /* Now, do an incremental load. */ |
| |
| processing_acc_compilation = 1; |
| dbx_symfile_read (objfile, 0); |
| } |
| |
| static const struct sym_fns aout_sym_fns = |
| { |
| dbx_new_init, /* init anything gbl to entire symtab */ |
| dbx_symfile_init, /* read initial info, setup for sym_read() */ |
| dbx_symfile_read, /* read a symbol file into symtab */ |
| dbx_symfile_finish, /* finished with file, cleanup */ |
| default_symfile_offsets, /* parse user's offsets to internal form */ |
| default_symfile_segments, /* Get segment information from a file. */ |
| NULL, |
| default_symfile_relocate, /* Relocate a debug section. */ |
| NULL, /* sym_probe_fns */ |
| }; |
| |
| void _initialize_dbxread (); |
| void |
| _initialize_dbxread () |
| { |
| add_symtab_fns (bfd_target_aout_flavour, &aout_sym_fns); |
| } |