1 /* Read coff symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1987-2013 Free Software Foundation, Inc.
3 Contributed by David D. Johnson, Brown University (ddj@cs.brown.edu).
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "breakpoint.h"
27 #include "gdb_obstack.h"
29 #include "gdb_string.h"
32 #include "coff/internal.h" /* Internal format of COFF symbols in BFD */
33 #include "libcoff.h" /* FIXME secret internal data from BFD */
36 #include "gdb-stabs.h"
37 #include "stabsread.h"
38 #include "complaints.h"
40 #include "gdb_assert.h"
42 #include "dictionary.h"
44 #include "coff-pe-read.h"
48 extern void _initialize_coffread (void);
50 /* Key for COFF-associated data. */
52 static const struct objfile_data *coff_objfile_data_key;
54 /* The objfile we are currently reading. */
56 static struct objfile *coffread_objfile;
58 struct coff_symfile_info
60 file_ptr min_lineno_offset; /* Where in file lowest line#s are. */
61 file_ptr max_lineno_offset; /* 1+last byte of line#s in file. */
63 CORE_ADDR textaddr; /* Addr of .text section. */
64 unsigned int textsize; /* Size of .text section. */
65 struct stab_section_list *stabsects; /* .stab sections. */
66 asection *stabstrsect; /* Section pointer for .stab section. */
70 /* Translate an external name string into a user-visible name. */
71 #define EXTERNAL_NAME(string, abfd) \
72 (string[0] == bfd_get_symbol_leading_char (abfd) \
73 ? string + 1 : string)
75 /* To be an sdb debug type, type must have at least a basic or primary
76 derived type. Using this rather than checking against T_NULL is
77 said to prevent core dumps if we try to operate on Michael Bloom
80 #define SDB_TYPE(type) (BTYPE(type) | (type & N_TMASK))
82 /* Core address of start and end of text of current source file.
83 This comes from a ".text" symbol where x_nlinno > 0. */
85 static CORE_ADDR current_source_start_addr;
86 static CORE_ADDR current_source_end_addr;
88 /* The addresses of the symbol table stream and number of symbols
89 of the object file we are reading (as copied into core). */
91 static bfd *nlist_bfd_global;
92 static int nlist_nsyms_global;
95 /* Pointers to scratch storage, used for reading raw symbols and
98 static char *temp_sym;
99 static char *temp_aux;
101 /* Local variables that hold the shift and mask values for the
102 COFF file that we are currently reading. These come back to us
103 from BFD, and are referenced by their macro names, as well as
104 internally to the BTYPE, ISPTR, ISFCN, ISARY, ISTAG, and DECREF
105 macros from include/coff/internal.h . */
107 static unsigned local_n_btmask;
108 static unsigned local_n_btshft;
109 static unsigned local_n_tmask;
110 static unsigned local_n_tshift;
112 #define N_BTMASK local_n_btmask
113 #define N_BTSHFT local_n_btshft
114 #define N_TMASK local_n_tmask
115 #define N_TSHIFT local_n_tshift
117 /* Local variables that hold the sizes in the file of various COFF
118 structures. (We only need to know this to read them from the file
119 -- BFD will then translate the data in them, into `internal_xxx'
120 structs in the right byte order, alignment, etc.) */
122 static unsigned local_linesz;
123 static unsigned local_symesz;
124 static unsigned local_auxesz;
126 /* This is set if this is a PE format file. */
130 /* Chain of typedefs of pointers to empty struct/union types.
131 They are chained thru the SYMBOL_VALUE_CHAIN. */
133 static struct symbol *opaque_type_chain[HASHSIZE];
135 /* Simplified internal version of coff symbol table information. */
140 int c_symnum; /* Symbol number of this entry. */
141 int c_naux; /* 0 if syment only, 1 if syment +
149 extern void stabsread_clear_cache (void);
151 static struct type *coff_read_struct_type (int, int, int,
154 static struct type *decode_base_type (struct coff_symbol *,
156 union internal_auxent *,
159 static struct type *decode_type (struct coff_symbol *, unsigned int,
160 union internal_auxent *,
163 static struct type *decode_function_type (struct coff_symbol *,
165 union internal_auxent *,
168 static struct type *coff_read_enum_type (int, int, int,
171 static struct symbol *process_coff_symbol (struct coff_symbol *,
172 union internal_auxent *,
175 static void patch_opaque_types (struct symtab *);
177 static void enter_linenos (long, int, int, struct objfile *);
179 static void free_linetab (void);
181 static void free_linetab_cleanup (void *ignore);
183 static int init_lineno (bfd *, long, int);
185 static char *getsymname (struct internal_syment *);
187 static const char *coff_getfilename (union internal_auxent *);
189 static void free_stringtab (void);
191 static void free_stringtab_cleanup (void *ignore);
193 static int init_stringtab (bfd *, long);
195 static void read_one_sym (struct coff_symbol *,
196 struct internal_syment *,
197 union internal_auxent *);
199 static void coff_symtab_read (long, unsigned int, struct objfile *);
201 /* We are called once per section from coff_symfile_read. We
202 need to examine each section we are passed, check to see
203 if it is something we are interested in processing, and
204 if so, stash away some access information for the section.
206 FIXME: The section names should not be hardwired strings (what
207 should they be? I don't think most object file formats have enough
208 section flags to specify what kind of debug section it is
212 coff_locate_sections (bfd *abfd, asection *sectp, void *csip)
214 struct coff_symfile_info *csi;
217 csi = (struct coff_symfile_info *) csip;
218 name = bfd_get_section_name (abfd, sectp);
219 if (strcmp (name, ".text") == 0)
221 csi->textaddr = bfd_section_vma (abfd, sectp);
222 csi->textsize += bfd_section_size (abfd, sectp);
224 else if (strncmp (name, ".text", sizeof ".text" - 1) == 0)
226 csi->textsize += bfd_section_size (abfd, sectp);
228 else if (strcmp (name, ".stabstr") == 0)
230 csi->stabstrsect = sectp;
232 else if (strncmp (name, ".stab", sizeof ".stab" - 1) == 0)
236 /* We can have multiple .stab sections if linked with
238 for (s = name + sizeof ".stab" - 1; *s != '\0'; s++)
243 struct stab_section_list *n, **pn;
245 n = ((struct stab_section_list *)
246 xmalloc (sizeof (struct stab_section_list)));
249 for (pn = &csi->stabsects; *pn != NULL; pn = &(*pn)->next)
253 /* This will be run after coffstab_build_psymtabs is called
254 in coff_symfile_read, at which point we no longer need
256 make_cleanup (xfree, n);
261 /* Return the section_offsets* that CS points to. */
262 static int cs_to_section (struct coff_symbol *, struct objfile *);
264 struct find_targ_sec_arg
271 find_targ_sec (bfd *abfd, asection *sect, void *obj)
273 struct find_targ_sec_arg *args = (struct find_targ_sec_arg *) obj;
275 if (sect->target_index == args->targ_index)
276 *args->resultp = sect;
279 /* Return the bfd_section that CS points to. */
280 static struct bfd_section*
281 cs_to_bfd_section (struct coff_symbol *cs, struct objfile *objfile)
283 asection *sect = NULL;
284 struct find_targ_sec_arg args;
286 args.targ_index = cs->c_secnum;
287 args.resultp = §
288 bfd_map_over_sections (objfile->obfd, find_targ_sec, &args);
292 /* Return the section number (SECT_OFF_*) that CS points to. */
294 cs_to_section (struct coff_symbol *cs, struct objfile *objfile)
296 asection *sect = cs_to_bfd_section (cs, objfile);
299 return SECT_OFF_TEXT (objfile);
303 /* Return the address of the section of a COFF symbol. */
305 static CORE_ADDR cs_section_address (struct coff_symbol *, bfd *);
308 cs_section_address (struct coff_symbol *cs, bfd *abfd)
310 asection *sect = NULL;
311 struct find_targ_sec_arg args;
314 args.targ_index = cs->c_secnum;
315 args.resultp = §
316 bfd_map_over_sections (abfd, find_targ_sec, &args);
318 addr = bfd_get_section_vma (abfd, sect);
322 /* Look up a coff type-number index. Return the address of the slot
323 where the type for that index is stored.
324 The type-number is in INDEX.
326 This can be used for finding the type associated with that index
327 or for associating a new type with the index. */
329 static struct type **
330 coff_lookup_type (int index)
332 if (index >= type_vector_length)
334 int old_vector_length = type_vector_length;
336 type_vector_length *= 2;
337 if (index /* is still */ >= type_vector_length)
338 type_vector_length = index * 2;
340 type_vector = (struct type **)
341 xrealloc ((char *) type_vector,
342 type_vector_length * sizeof (struct type *));
343 memset (&type_vector[old_vector_length], 0,
344 (type_vector_length - old_vector_length) * sizeof (struct type *));
346 return &type_vector[index];
349 /* Make sure there is a type allocated for type number index
350 and return the type object.
351 This can create an empty (zeroed) type object. */
354 coff_alloc_type (int index)
356 struct type **type_addr = coff_lookup_type (index);
357 struct type *type = *type_addr;
359 /* If we are referring to a type not known at all yet,
360 allocate an empty type for it.
361 We will fill it in later if we find out how. */
364 type = alloc_type (coffread_objfile);
370 /* Start a new symtab for a new source file.
371 This is called when a COFF ".file" symbol is seen;
372 it indicates the start of data for one original source file. */
375 coff_start_symtab (const char *name)
378 /* We fill in the filename later. start_symtab puts this pointer
379 into last_source_file and we put it in subfiles->name, which
380 end_symtab frees; that's why it must be malloc'd. */
382 /* We never know the directory name for COFF. */
384 /* The start address is irrelevant, since we set
385 last_source_start_addr in coff_end_symtab. */
387 record_debugformat ("COFF");
390 /* Save the vital information from when starting to read a file,
391 for use when closing off the current file.
392 NAME is the file name the symbols came from, START_ADDR is the
393 first text address for the file, and SIZE is the number of bytes of
397 complete_symtab (const char *name, CORE_ADDR start_addr, unsigned int size)
399 set_last_source_file (name);
400 current_source_start_addr = start_addr;
401 current_source_end_addr = start_addr + size;
404 /* Finish the symbol definitions for one main source file, close off
405 all the lexical contexts for that file (creating struct block's for
406 them), then make the struct symtab for that file and put it in the
410 coff_end_symtab (struct objfile *objfile)
412 last_source_start_addr = current_source_start_addr;
414 end_symtab (current_source_end_addr, objfile,
415 SECT_OFF_TEXT (objfile));
417 /* Reinitialize for beginning of new file. */
418 set_last_source_file (NULL);
421 /* The linker sometimes generates some non-function symbols inside
422 functions referencing variables imported from another DLL.
423 Return nonzero if the given symbol corresponds to one of them. */
426 is_import_fixup_symbol (struct coff_symbol *cs,
427 enum minimal_symbol_type type)
429 /* The following is a bit of a heuristic using the characterictics
430 of these fixup symbols, but should work well in practice... */
433 /* Must be a non-static text symbol. */
434 if (type != mst_text)
437 /* Must be a non-function symbol. */
438 if (ISFCN (cs->c_type))
441 /* The name must start with "__fu<digits>__". */
442 if (strncmp (cs->c_name, "__fu", 4) != 0)
444 if (! isdigit (cs->c_name[4]))
446 for (i = 5; cs->c_name[i] != '\0' && isdigit (cs->c_name[i]); i++)
447 /* Nothing, just incrementing index past all digits. */;
448 if (cs->c_name[i] != '_' || cs->c_name[i + 1] != '_')
454 static struct minimal_symbol *
455 record_minimal_symbol (struct coff_symbol *cs, CORE_ADDR address,
456 enum minimal_symbol_type type, int section,
457 struct objfile *objfile)
459 struct bfd_section *bfd_section;
461 /* We don't want TDESC entry points in the minimal symbol table. */
462 if (cs->c_name[0] == '@')
465 if (is_import_fixup_symbol (cs, type))
467 /* Because the value of these symbols is within a function code
468 range, these symbols interfere with the symbol-from-address
469 reverse lookup; this manifests itselfs in backtraces, or any
470 other commands that prints symbolic addresses. Just pretend
471 these symbols do not exist. */
475 bfd_section = cs_to_bfd_section (cs, objfile);
476 return prim_record_minimal_symbol_and_info (cs->c_name, address,
478 bfd_section, objfile);
481 /* coff_symfile_init ()
482 is the coff-specific initialization routine for reading symbols.
483 It is passed a struct objfile which contains, among other things,
484 the BFD for the file whose symbols are being read, and a slot for
485 a pointer to "private data" which we fill with cookies and other
486 treats for coff_symfile_read ().
488 We will only be called if this is a COFF or COFF-like file. BFD
489 handles figuring out the format of the file, and code in symtab.c
490 uses BFD's determination to vector to us.
492 The ultimate result is a new symtab (or, FIXME, eventually a
496 coff_symfile_init (struct objfile *objfile)
498 struct dbx_symfile_info *dbx;
499 struct coff_symfile_info *coff;
501 /* Allocate struct to keep track of stab reading. */
502 dbx = XCNEW (struct dbx_symfile_info);
503 set_objfile_data (objfile, dbx_objfile_data_key, dbx);
505 /* Allocate struct to keep track of the symfile. */
506 coff = XCNEW (struct coff_symfile_info);
507 set_objfile_data (objfile, coff_objfile_data_key, coff);
509 /* COFF objects may be reordered, so set OBJF_REORDERED. If we
510 find this causes a significant slowdown in gdb then we could
511 set it in the debug symbol readers only when necessary. */
512 objfile->flags |= OBJF_REORDERED;
515 /* This function is called for every section; it finds the outer
516 limits of the line table (minimum and maximum file offset) so that
517 the mainline code can read the whole thing for efficiency. */
520 find_linenos (bfd *abfd, struct bfd_section *asect, void *vpinfo)
522 struct coff_symfile_info *info;
524 file_ptr offset, maxoff;
526 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
527 count = asect->lineno_count;
528 /* End of warning. */
532 size = count * local_linesz;
534 info = (struct coff_symfile_info *) vpinfo;
535 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
536 offset = asect->line_filepos;
537 /* End of warning. */
539 if (offset < info->min_lineno_offset || info->min_lineno_offset == 0)
540 info->min_lineno_offset = offset;
542 maxoff = offset + size;
543 if (maxoff > info->max_lineno_offset)
544 info->max_lineno_offset = maxoff;
548 /* The BFD for this file -- only good while we're actively reading
549 symbols into a psymtab or a symtab. */
551 static bfd *symfile_bfd;
553 /* Read a symbol file, after initialization by coff_symfile_init. */
556 coff_symfile_read (struct objfile *objfile, int symfile_flags)
558 struct coff_symfile_info *info;
559 struct dbx_symfile_info *dbxinfo;
560 bfd *abfd = objfile->obfd;
561 coff_data_type *cdata = coff_data (abfd);
562 char *name = bfd_get_filename (abfd);
564 unsigned int num_symbols;
566 int stringtab_offset;
567 struct cleanup *back_to, *cleanup_minimal_symbols;
570 info = objfile_data (objfile, coff_objfile_data_key);
571 dbxinfo = DBX_SYMFILE_INFO (objfile);
572 symfile_bfd = abfd; /* Kludge for swap routines. */
574 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
575 num_symbols = bfd_get_symcount (abfd); /* How many syms */
576 symtab_offset = cdata->sym_filepos; /* Symbol table file offset */
577 stringtab_offset = symtab_offset + /* String table file offset */
578 num_symbols * cdata->local_symesz;
580 /* Set a few file-statics that give us specific information about
581 the particular COFF file format we're reading. */
582 local_n_btmask = cdata->local_n_btmask;
583 local_n_btshft = cdata->local_n_btshft;
584 local_n_tmask = cdata->local_n_tmask;
585 local_n_tshift = cdata->local_n_tshift;
586 local_linesz = cdata->local_linesz;
587 local_symesz = cdata->local_symesz;
588 local_auxesz = cdata->local_auxesz;
590 /* Allocate space for raw symbol and aux entries, based on their
591 space requirements as reported by BFD. */
592 temp_sym = (char *) xmalloc
593 (cdata->local_symesz + cdata->local_auxesz);
594 temp_aux = temp_sym + cdata->local_symesz;
595 back_to = make_cleanup (free_current_contents, &temp_sym);
597 /* We need to know whether this is a PE file, because in PE files,
598 unlike standard COFF files, symbol values are stored as offsets
599 from the section address, rather than as absolute addresses.
600 FIXME: We should use BFD to read the symbol table, and thus avoid
603 strncmp (bfd_get_target (objfile->obfd), "pe", 2) == 0
604 || strncmp (bfd_get_target (objfile->obfd), "epoc-pe", 7) == 0;
606 /* End of warning. */
608 info->min_lineno_offset = 0;
609 info->max_lineno_offset = 0;
611 /* Only read line number information if we have symbols.
613 On Windows NT, some of the system's DLL's have sections with
614 PointerToLinenumbers fields that are non-zero, but point at
615 random places within the image file. (In the case I found,
616 KERNEL32.DLL's .text section has a line number info pointer that
617 points into the middle of the string `lib\\i386\kernel32.dll'.)
619 However, these DLL's also have no symbols. The line number
620 tables are meaningless without symbols. And in fact, GDB never
621 uses the line number information unless there are symbols. So we
622 can avoid spurious error messages (and maybe run a little
623 faster!) by not even reading the line number table unless we have
627 /* Read the line number table, all at once. */
628 bfd_map_over_sections (abfd, find_linenos, (void *) info);
630 make_cleanup (free_linetab_cleanup, 0 /*ignore*/);
631 val = init_lineno (abfd, info->min_lineno_offset,
632 info->max_lineno_offset - info->min_lineno_offset);
634 error (_("\"%s\": error reading line numbers."), name);
637 /* Now read the string table, all at once. */
639 make_cleanup (free_stringtab_cleanup, 0 /*ignore*/);
640 val = init_stringtab (abfd, stringtab_offset);
642 error (_("\"%s\": can't get string table"), name);
644 init_minimal_symbol_collection ();
645 cleanup_minimal_symbols = make_cleanup_discard_minimal_symbols ();
647 /* Now that the executable file is positioned at symbol table,
648 process it and define symbols accordingly. */
650 coff_symtab_read ((long) symtab_offset, num_symbols, objfile);
652 /* Install any minimal symbols that have been collected as the
653 current minimal symbols for this objfile. */
655 install_minimal_symbols (objfile);
657 /* Free the installed minimal symbol data. */
658 do_cleanups (cleanup_minimal_symbols);
660 bfd_map_over_sections (abfd, coff_locate_sections, (void *) info);
664 if (!info->stabstrsect)
666 error (_("The debugging information in `%s' is corrupted.\nThe "
667 "file has a `.stabs' section, but no `.stabstr' section."),
671 /* FIXME: dubious. Why can't we use something normal like
672 bfd_get_section_contents? */
673 bfd_seek (abfd, abfd->where, 0);
675 stabstrsize = bfd_section_size (abfd, info->stabstrsect);
677 coffstab_build_psymtabs (objfile,
678 info->textaddr, info->textsize,
680 info->stabstrsect->filepos, stabstrsize);
682 if (dwarf2_has_info (objfile, NULL))
684 /* DWARF2 sections. */
685 dwarf2_build_psymtabs (objfile);
688 dwarf2_build_frame_info (objfile);
690 /* Try to add separate debug file if no symbols table found. */
691 if (!objfile_has_partial_symbols (objfile))
695 debugfile = find_separate_debug_file_by_debuglink (objfile);
696 make_cleanup (xfree, debugfile);
700 bfd *abfd = symfile_bfd_open (debugfile);
702 make_cleanup_bfd_unref (abfd);
703 symbol_file_add_separate (abfd, symfile_flags, objfile);
707 do_cleanups (back_to);
711 coff_new_init (struct objfile *ignore)
715 /* Perform any local cleanups required when we are done with a
716 particular objfile. I.E, we are in the process of discarding all
717 symbol information for an objfile, freeing up all memory held for
718 it, and unlinking the objfile struct from the global list of known
722 coff_symfile_finish (struct objfile *objfile)
724 /* Let stabs reader clean up. */
725 stabsread_clear_cache ();
727 dwarf2_free_objfile (objfile);
731 /* Given pointers to a symbol table in coff style exec file,
732 analyze them and create struct symtab's describing the symbols.
733 NSYMS is the number of symbols in the symbol table.
734 We read them one at a time using read_one_sym (). */
737 coff_symtab_read (long symtab_offset, unsigned int nsyms,
738 struct objfile *objfile)
740 struct gdbarch *gdbarch = get_objfile_arch (objfile);
741 struct context_stack *new;
742 struct coff_symbol coff_symbol;
743 struct coff_symbol *cs = &coff_symbol;
744 static struct internal_syment main_sym;
745 static union internal_auxent main_aux;
746 struct coff_symbol fcn_cs_saved;
747 static struct internal_syment fcn_sym_saved;
748 static union internal_auxent fcn_aux_saved;
750 /* A .file is open. */
751 int in_source_file = 0;
752 int next_file_symnum = -1;
753 /* Name of the current file. */
754 const char *filestring = "";
756 int fcn_first_line = 0;
757 CORE_ADDR fcn_first_line_addr = 0;
758 int fcn_last_line = 0;
759 int fcn_start_addr = 0;
760 long fcn_line_ptr = 0;
763 struct minimal_symbol *msym;
765 /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous....
766 it's hard to know I've really worked around it. The fix should
767 be harmless, anyway). The symptom of the bug is that the first
768 fread (in read_one_sym), will (in my example) actually get data
769 from file offset 268, when the fseek was to 264 (and ftell shows
770 264). This causes all hell to break loose. I was unable to
771 reproduce this on a short test program which operated on the same
772 file, performing (I think) the same sequence of operations.
774 It stopped happening when I put in this (former) rewind().
776 FIXME: Find out if this has been reported to Sun, whether it has
777 been fixed in a later release, etc. */
779 bfd_seek (objfile->obfd, 0, 0);
781 /* Position to read the symbol table. */
782 val = bfd_seek (objfile->obfd, (long) symtab_offset, 0);
784 perror_with_name (objfile->name);
786 coffread_objfile = objfile;
787 nlist_bfd_global = objfile->obfd;
788 nlist_nsyms_global = nsyms;
789 set_last_source_file (NULL);
790 memset (opaque_type_chain, 0, sizeof opaque_type_chain);
792 if (type_vector) /* Get rid of previous one. */
794 type_vector_length = 160;
795 type_vector = (struct type **)
796 xmalloc (type_vector_length * sizeof (struct type *));
797 memset (type_vector, 0, type_vector_length * sizeof (struct type *));
799 coff_start_symtab ("");
802 while (symnum < nsyms)
804 QUIT; /* Make this command interruptable. */
806 read_one_sym (cs, &main_sym, &main_aux);
808 if (cs->c_symnum == next_file_symnum && cs->c_sclass != C_FILE)
810 if (get_last_source_file ())
811 coff_end_symtab (objfile);
813 coff_start_symtab ("_globals_");
814 /* coff_start_symtab will set the language of this symtab to
815 language_unknown, since such a ``file name'' is not
816 recognized. Override that with the minimal language to
817 allow printing values in this symtab. */
818 current_subfile->language = language_minimal;
819 complete_symtab ("_globals_", 0, 0);
820 /* Done with all files, everything from here on out is
824 /* Special case for file with type declarations only, no
826 if (!get_last_source_file () && SDB_TYPE (cs->c_type)
827 && cs->c_secnum == N_DEBUG)
828 complete_symtab (filestring, 0, 0);
830 /* Typedefs should not be treated as symbol definitions. */
831 if (ISFCN (cs->c_type) && cs->c_sclass != C_TPDEF)
833 /* Record all functions -- external and static -- in
835 int section = cs_to_section (cs, objfile);
837 tmpaddr = cs->c_value + ANOFFSET (objfile->section_offsets,
838 SECT_OFF_TEXT (objfile));
839 record_minimal_symbol (cs, tmpaddr, mst_text,
842 fcn_line_ptr = main_aux.x_sym.x_fcnary.x_fcn.x_lnnoptr;
843 fcn_start_addr = tmpaddr;
845 fcn_sym_saved = main_sym;
846 fcn_aux_saved = main_aux;
850 switch (cs->c_sclass)
859 complaint (&symfile_complaints,
860 _("Bad n_sclass for symbol %s"),
865 /* c_value field contains symnum of next .file entry in
866 table or symnum of first global after last .file. */
867 next_file_symnum = cs->c_value;
869 filestring = coff_getfilename (&main_aux);
873 /* Complete symbol table for last object file
874 containing debugging information. */
875 if (get_last_source_file ())
877 coff_end_symtab (objfile);
878 coff_start_symtab (filestring);
883 /* C_LABEL is used for labels and static functions.
884 Including it here allows gdb to see static functions when
885 no debug info is available. */
887 /* However, labels within a function can make weird
888 backtraces, so filter them out (from phdm@macqel.be). */
894 case C_THUMBSTATFUNC:
895 if (cs->c_name[0] == '.')
897 if (strcmp (cs->c_name, ".text") == 0)
899 /* FIXME: don't wire in ".text" as section name or
901 /* Check for in_source_file deals with case of a
902 file with debugging symbols followed by a later
903 file with no symbols. */
905 complete_symtab (filestring,
906 cs->c_value + ANOFFSET (objfile->section_offsets,
907 SECT_OFF_TEXT (objfile)),
908 main_aux.x_scn.x_scnlen);
911 /* Flush rest of '.' symbols. */
914 else if (!SDB_TYPE (cs->c_type)
915 && cs->c_name[0] == 'L'
916 && (strncmp (cs->c_name, "LI%", 3) == 0
917 || strncmp (cs->c_name, "LF%", 3) == 0
918 || strncmp (cs->c_name, "LC%", 3) == 0
919 || strncmp (cs->c_name, "LP%", 3) == 0
920 || strncmp (cs->c_name, "LPB%", 4) == 0
921 || strncmp (cs->c_name, "LBB%", 4) == 0
922 || strncmp (cs->c_name, "LBE%", 4) == 0
923 || strncmp (cs->c_name, "LPBX%", 5) == 0))
924 /* At least on a 3b1, gcc generates swbeg and string labels
925 that look like this. Ignore them. */
927 /* Fall in for static symbols that don't start with '.' */
932 /* Record it in the minimal symbols regardless of
933 SDB_TYPE. This parallels what we do for other debug
934 formats, and probably is needed to make
935 print_address_symbolic work right without the (now
936 gone) "set fast-symbolic-addr off" kludge. */
938 enum minimal_symbol_type ms_type;
941 if (cs->c_secnum == N_UNDEF)
943 /* This is a common symbol. We used to rely on
944 the target to tell us whether it knows where
945 the symbol has been relocated to, but none of
946 the target implementations actually provided
947 that operation. So we just ignore the symbol,
948 the same way we would do if we had a target-side
949 symbol lookup which returned no match. */
952 else if (cs->c_secnum == N_ABS)
954 /* Use the correct minimal symbol type (and don't
955 relocate) for absolute values. */
957 sec = cs_to_section (cs, objfile);
958 tmpaddr = cs->c_value;
962 asection *bfd_section = cs_to_bfd_section (cs, objfile);
964 sec = cs_to_section (cs, objfile);
965 tmpaddr = cs->c_value;
966 /* Statics in a PE file also get relocated. */
967 if (cs->c_sclass == C_EXT
968 || cs->c_sclass == C_THUMBEXTFUNC
969 || cs->c_sclass == C_THUMBEXT
970 || (pe_file && (cs->c_sclass == C_STAT)))
971 tmpaddr += ANOFFSET (objfile->section_offsets, sec);
973 if (bfd_section->flags & SEC_CODE)
976 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC
977 || cs->c_sclass == C_THUMBEXT ?
978 mst_text : mst_file_text;
979 tmpaddr = gdbarch_addr_bits_remove (gdbarch, tmpaddr);
981 else if (bfd_section->flags & SEC_ALLOC
982 && bfd_section->flags & SEC_LOAD)
985 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
986 ? mst_data : mst_file_data;
988 else if (bfd_section->flags & SEC_ALLOC)
991 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
992 ? mst_bss : mst_file_bss;
995 ms_type = mst_unknown;
998 msym = record_minimal_symbol (cs, tmpaddr, ms_type,
1001 gdbarch_coff_make_msymbol_special (gdbarch,
1002 cs->c_sclass, msym);
1004 if (SDB_TYPE (cs->c_type))
1008 sym = process_coff_symbol
1009 (cs, &main_aux, objfile);
1010 SYMBOL_VALUE (sym) = tmpaddr;
1011 SYMBOL_SECTION (sym) = sec;
1017 if (strcmp (cs->c_name, ".bf") == 0)
1019 within_function = 1;
1021 /* Value contains address of first non-init type
1023 /* main_aux.x_sym.x_misc.x_lnsz.x_lnno
1024 contains line number of '{' }. */
1025 if (cs->c_naux != 1)
1026 complaint (&symfile_complaints,
1027 _("`.bf' symbol %d has no aux entry"),
1029 fcn_first_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1030 fcn_first_line_addr = cs->c_value;
1032 /* Might want to check that locals are 0 and
1033 context_stack_depth is zero, and complain if not. */
1036 new = push_context (depth, fcn_start_addr);
1037 fcn_cs_saved.c_name = getsymname (&fcn_sym_saved);
1039 process_coff_symbol (&fcn_cs_saved,
1040 &fcn_aux_saved, objfile);
1042 else if (strcmp (cs->c_name, ".ef") == 0)
1044 if (!within_function)
1045 error (_("Bad coff function information."));
1046 /* The value of .ef is the address of epilogue code;
1047 not useful for gdb. */
1048 /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
1049 contains number of lines to '}' */
1051 if (context_stack_depth <= 0)
1052 { /* We attempted to pop an empty context stack. */
1053 complaint (&symfile_complaints,
1054 _("`.ef' symbol without matching `.bf' "
1055 "symbol ignored starting at symnum %d"),
1057 within_function = 0;
1061 new = pop_context ();
1062 /* Stack must be empty now. */
1063 if (context_stack_depth > 0 || new == NULL)
1065 complaint (&symfile_complaints,
1066 _("Unmatched .ef symbol(s) ignored "
1067 "starting at symnum %d"),
1069 within_function = 0;
1072 if (cs->c_naux != 1)
1074 complaint (&symfile_complaints,
1075 _("`.ef' symbol %d has no aux entry"),
1077 fcn_last_line = 0x7FFFFFFF;
1081 fcn_last_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1083 /* fcn_first_line is the line number of the opening '{'.
1084 Do not record it - because it would affect gdb's idea
1085 of the line number of the first statement of the
1086 function - except for one-line functions, for which
1087 it is also the line number of all the statements and
1088 of the closing '}', and for which we do not have any
1089 other statement-line-number. */
1090 if (fcn_last_line == 1)
1091 record_line (current_subfile, fcn_first_line,
1092 gdbarch_addr_bits_remove (gdbarch,
1093 fcn_first_line_addr));
1095 enter_linenos (fcn_line_ptr, fcn_first_line,
1096 fcn_last_line, objfile);
1098 finish_block (new->name, &local_symbols,
1099 new->old_blocks, new->start_addr,
1100 fcn_cs_saved.c_value
1101 + fcn_aux_saved.x_sym.x_misc.x_fsize
1102 + ANOFFSET (objfile->section_offsets,
1103 SECT_OFF_TEXT (objfile)),
1106 within_function = 0;
1111 if (strcmp (cs->c_name, ".bb") == 0)
1113 tmpaddr = cs->c_value;
1114 tmpaddr += ANOFFSET (objfile->section_offsets,
1115 SECT_OFF_TEXT (objfile));
1116 push_context (++depth, tmpaddr);
1118 else if (strcmp (cs->c_name, ".eb") == 0)
1120 if (context_stack_depth <= 0)
1121 { /* We attempted to pop an empty context stack. */
1122 complaint (&symfile_complaints,
1123 _("`.eb' symbol without matching `.bb' "
1124 "symbol ignored starting at symnum %d"),
1129 new = pop_context ();
1130 if (depth-- != new->depth)
1132 complaint (&symfile_complaints,
1133 _("Mismatched .eb symbol ignored "
1134 "starting at symnum %d"),
1138 if (local_symbols && context_stack_depth > 0)
1141 cs->c_value + ANOFFSET (objfile->section_offsets,
1142 SECT_OFF_TEXT (objfile));
1143 /* Make a block for the local symbols within. */
1144 finish_block (0, &local_symbols, new->old_blocks,
1145 new->start_addr, tmpaddr, objfile);
1147 /* Now pop locals of block just finished. */
1148 local_symbols = new->locals;
1153 process_coff_symbol (cs, &main_aux, objfile);
1158 if ((nsyms == 0) && (pe_file))
1160 /* We've got no debugging symbols, but it's a portable
1161 executable, so try to read the export table. */
1162 read_pe_exported_syms (objfile);
1165 if (get_last_source_file ())
1166 coff_end_symtab (objfile);
1168 /* Patch up any opaque types (references to types that are not defined
1169 in the file where they are referenced, e.g. "struct foo *bar"). */
1170 ALL_OBJFILE_SYMTABS (objfile, s)
1171 patch_opaque_types (s);
1173 coffread_objfile = NULL;
1176 /* Routines for reading headers and symbols from executable. */
1178 /* Read the next symbol, swap it, and return it in both
1179 internal_syment form, and coff_symbol form. Also return its first
1180 auxent, if any, in internal_auxent form, and skip any other
1184 read_one_sym (struct coff_symbol *cs,
1185 struct internal_syment *sym,
1186 union internal_auxent *aux)
1189 bfd_size_type bytes;
1191 cs->c_symnum = symnum;
1192 bytes = bfd_bread (temp_sym, local_symesz, nlist_bfd_global);
1193 if (bytes != local_symesz)
1194 error (_("%s: error reading symbols"), coffread_objfile->name);
1195 bfd_coff_swap_sym_in (symfile_bfd, temp_sym, (char *) sym);
1196 cs->c_naux = sym->n_numaux & 0xff;
1197 if (cs->c_naux >= 1)
1199 bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1200 if (bytes != local_auxesz)
1201 error (_("%s: error reading symbols"), coffread_objfile->name);
1202 bfd_coff_swap_aux_in (symfile_bfd, temp_aux,
1203 sym->n_type, sym->n_sclass,
1204 0, cs->c_naux, (char *) aux);
1205 /* If more than one aux entry, read past it (only the first aux
1207 for (i = 1; i < cs->c_naux; i++)
1209 bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1210 if (bytes != local_auxesz)
1211 error (_("%s: error reading symbols"), coffread_objfile->name);
1214 cs->c_name = getsymname (sym);
1215 cs->c_value = sym->n_value;
1216 cs->c_sclass = (sym->n_sclass & 0xff);
1217 cs->c_secnum = sym->n_scnum;
1218 cs->c_type = (unsigned) sym->n_type;
1219 if (!SDB_TYPE (cs->c_type))
1223 if (cs->c_sclass & 128)
1224 printf (_("thumb symbol %s, class 0x%x\n"), cs->c_name, cs->c_sclass);
1227 symnum += 1 + cs->c_naux;
1229 /* The PE file format stores symbol values as offsets within the
1230 section, rather than as absolute addresses. We correct that
1231 here, if the symbol has an appropriate storage class. FIXME: We
1232 should use BFD to read the symbols, rather than duplicating the
1236 switch (cs->c_sclass)
1240 case C_THUMBEXTFUNC:
1245 case C_THUMBSTATFUNC:
1251 if (cs->c_secnum != 0)
1252 cs->c_value += cs_section_address (cs, symfile_bfd);
1258 /* Support for string table handling. */
1260 static char *stringtab = NULL;
1263 init_stringtab (bfd *abfd, long offset)
1267 unsigned char lengthbuf[4];
1271 /* If the file is stripped, the offset might be zero, indicating no
1272 string table. Just return with `stringtab' set to null. */
1276 if (bfd_seek (abfd, offset, 0) < 0)
1279 val = bfd_bread ((char *) lengthbuf, sizeof lengthbuf, abfd);
1280 length = bfd_h_get_32 (symfile_bfd, lengthbuf);
1282 /* If no string table is needed, then the file may end immediately
1283 after the symbols. Just return with `stringtab' set to null. */
1284 if (val != sizeof lengthbuf || length < sizeof lengthbuf)
1287 stringtab = (char *) xmalloc (length);
1288 /* This is in target format (probably not very useful, and not
1289 currently used), not host format. */
1290 memcpy (stringtab, lengthbuf, sizeof lengthbuf);
1291 if (length == sizeof length) /* Empty table -- just the count. */
1294 val = bfd_bread (stringtab + sizeof lengthbuf,
1295 length - sizeof lengthbuf, abfd);
1296 if (val != length - sizeof lengthbuf || stringtab[length - 1] != '\0')
1303 free_stringtab (void)
1311 free_stringtab_cleanup (void *ignore)
1317 getsymname (struct internal_syment *symbol_entry)
1319 static char buffer[SYMNMLEN + 1];
1322 if (symbol_entry->_n._n_n._n_zeroes == 0)
1324 /* FIXME: Probably should be detecting corrupt symbol files by
1325 seeing whether offset points to within the stringtab. */
1326 result = stringtab + symbol_entry->_n._n_n._n_offset;
1330 strncpy (buffer, symbol_entry->_n._n_name, SYMNMLEN);
1331 buffer[SYMNMLEN] = '\0';
1337 /* Extract the file name from the aux entry of a C_FILE symbol.
1338 Return only the last component of the name. Result is in static
1339 storage and is only good for temporary use. */
1342 coff_getfilename (union internal_auxent *aux_entry)
1344 static char buffer[BUFSIZ];
1347 if (aux_entry->x_file.x_n.x_zeroes == 0)
1349 if (strlen (stringtab + aux_entry->x_file.x_n.x_offset) >= BUFSIZ)
1350 internal_error (__FILE__, __LINE__, _("coff file name too long"));
1351 strcpy (buffer, stringtab + aux_entry->x_file.x_n.x_offset);
1355 strncpy (buffer, aux_entry->x_file.x_fname, FILNMLEN);
1356 buffer[FILNMLEN] = '\0';
1360 /* FIXME: We should not be throwing away the information about what
1361 directory. It should go into dirname of the symtab, or some such
1363 result = lbasename (result);
1367 /* Support for line number handling. */
1369 static char *linetab = NULL;
1370 static long linetab_offset;
1371 static unsigned long linetab_size;
1373 /* Read in all the line numbers for fast lookups later. Leave them in
1374 external (unswapped) format in memory; we'll swap them as we enter
1375 them into GDB's data structures. */
1378 init_lineno (bfd *abfd, long offset, int size)
1382 linetab_offset = offset;
1383 linetab_size = size;
1390 if (bfd_seek (abfd, offset, 0) < 0)
1393 /* Allocate the desired table, plus a sentinel. */
1394 linetab = (char *) xmalloc (size + local_linesz);
1396 val = bfd_bread (linetab, size, abfd);
1400 /* Terminate it with an all-zero sentinel record. */
1401 memset (linetab + size, 0, local_linesz);
1415 free_linetab_cleanup (void *ignore)
1420 #if !defined (L_LNNO32)
1421 #define L_LNNO32(lp) ((lp)->l_lnno)
1425 enter_linenos (long file_offset, int first_line,
1426 int last_line, struct objfile *objfile)
1428 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1430 struct internal_lineno lptr;
1434 if (file_offset < linetab_offset)
1436 complaint (&symfile_complaints,
1437 _("Line number pointer %ld lower than start of line numbers"),
1439 if (file_offset > linetab_size) /* Too big to be an offset? */
1441 file_offset += linetab_offset; /* Try reading at that linetab
1445 rawptr = &linetab[file_offset - linetab_offset];
1447 /* Skip first line entry for each function. */
1448 rawptr += local_linesz;
1449 /* Line numbers start at one for the first line of the function. */
1452 /* If the line number table is full (e.g. 64K lines in COFF debug
1453 info), the next function's L_LNNO32 might not be zero, so don't
1454 overstep the table's end in any case. */
1455 while (rawptr <= &linetab[0] + linetab_size)
1457 bfd_coff_swap_lineno_in (symfile_bfd, rawptr, &lptr);
1458 rawptr += local_linesz;
1459 /* The next function, or the sentinel, will have L_LNNO32 zero;
1461 if (L_LNNO32 (&lptr) && L_LNNO32 (&lptr) <= last_line)
1463 CORE_ADDR addr = lptr.l_addr.l_paddr;
1464 addr += ANOFFSET (objfile->section_offsets,
1465 SECT_OFF_TEXT (objfile));
1466 record_line (current_subfile,
1467 first_line + L_LNNO32 (&lptr),
1468 gdbarch_addr_bits_remove (gdbarch, addr));
1476 patch_type (struct type *type, struct type *real_type)
1478 struct type *target = TYPE_TARGET_TYPE (type);
1479 struct type *real_target = TYPE_TARGET_TYPE (real_type);
1480 int field_size = TYPE_NFIELDS (real_target) * sizeof (struct field);
1482 TYPE_LENGTH (target) = TYPE_LENGTH (real_target);
1483 TYPE_NFIELDS (target) = TYPE_NFIELDS (real_target);
1484 TYPE_FIELDS (target) = (struct field *) TYPE_ALLOC (target,
1487 memcpy (TYPE_FIELDS (target),
1488 TYPE_FIELDS (real_target),
1491 if (TYPE_NAME (real_target))
1493 /* The previous copy of TYPE_NAME is allocated by
1494 process_coff_symbol. */
1495 if (TYPE_NAME (target))
1496 xfree ((char*) TYPE_NAME (target));
1497 TYPE_NAME (target) = xstrdup (TYPE_NAME (real_target));
1501 /* Patch up all appropriate typedef symbols in the opaque_type_chains
1502 so that they can be used to print out opaque data structures
1506 patch_opaque_types (struct symtab *s)
1509 struct block_iterator iter;
1510 struct symbol *real_sym;
1512 /* Go through the per-file symbols only. */
1513 b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), STATIC_BLOCK);
1514 ALL_BLOCK_SYMBOLS (b, iter, real_sym)
1516 /* Find completed typedefs to use to fix opaque ones.
1517 Remove syms from the chain when their types are stored,
1518 but search the whole chain, as there may be several syms
1519 from different files with the same name. */
1520 if (SYMBOL_CLASS (real_sym) == LOC_TYPEDEF
1521 && SYMBOL_DOMAIN (real_sym) == VAR_DOMAIN
1522 && TYPE_CODE (SYMBOL_TYPE (real_sym)) == TYPE_CODE_PTR
1523 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym))) != 0)
1525 const char *name = SYMBOL_LINKAGE_NAME (real_sym);
1526 int hash = hashname (name);
1527 struct symbol *sym, *prev;
1530 for (sym = opaque_type_chain[hash]; sym;)
1532 if (name[0] == SYMBOL_LINKAGE_NAME (sym)[0]
1533 && strcmp (name + 1, SYMBOL_LINKAGE_NAME (sym) + 1) == 0)
1537 SYMBOL_VALUE_CHAIN (prev) = SYMBOL_VALUE_CHAIN (sym);
1541 opaque_type_chain[hash] = SYMBOL_VALUE_CHAIN (sym);
1544 patch_type (SYMBOL_TYPE (sym), SYMBOL_TYPE (real_sym));
1548 sym = SYMBOL_VALUE_CHAIN (prev);
1552 sym = opaque_type_chain[hash];
1558 sym = SYMBOL_VALUE_CHAIN (sym);
1566 coff_reg_to_regnum (struct symbol *sym, struct gdbarch *gdbarch)
1568 return gdbarch_sdb_reg_to_regnum (gdbarch, SYMBOL_VALUE (sym));
1571 static const struct symbol_register_ops coff_register_funcs = {
1575 /* The "aclass" index for computed COFF symbols. */
1577 static int coff_register_index;
1579 static struct symbol *
1580 process_coff_symbol (struct coff_symbol *cs,
1581 union internal_auxent *aux,
1582 struct objfile *objfile)
1584 struct symbol *sym = allocate_symbol (objfile);
1588 name = EXTERNAL_NAME (name, objfile->obfd);
1589 SYMBOL_SET_LANGUAGE (sym, current_subfile->language);
1590 SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
1592 /* default assumptions */
1593 SYMBOL_VALUE (sym) = cs->c_value;
1594 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1595 SYMBOL_SECTION (sym) = cs_to_section (cs, objfile);
1597 if (ISFCN (cs->c_type))
1599 SYMBOL_VALUE (sym) += ANOFFSET (objfile->section_offsets,
1600 SECT_OFF_TEXT (objfile));
1602 lookup_function_type (decode_function_type (cs, cs->c_type,
1605 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
1606 if (cs->c_sclass == C_STAT || cs->c_sclass == C_THUMBSTAT
1607 || cs->c_sclass == C_THUMBSTATFUNC)
1608 add_symbol_to_list (sym, &file_symbols);
1609 else if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1610 || cs->c_sclass == C_THUMBEXTFUNC)
1611 add_symbol_to_list (sym, &global_symbols);
1615 SYMBOL_TYPE (sym) = decode_type (cs, cs->c_type, aux, objfile);
1616 switch (cs->c_sclass)
1622 SYMBOL_ACLASS_INDEX (sym) = LOC_LOCAL;
1623 add_symbol_to_list (sym, &local_symbols);
1627 case C_THUMBEXTFUNC:
1629 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
1630 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1631 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
1632 SECT_OFF_TEXT (objfile));
1633 add_symbol_to_list (sym, &global_symbols);
1637 case C_THUMBSTATFUNC:
1639 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
1640 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1641 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
1642 SECT_OFF_TEXT (objfile));
1643 if (within_function)
1645 /* Static symbol of local scope. */
1646 add_symbol_to_list (sym, &local_symbols);
1650 /* Static symbol at top level of file. */
1651 add_symbol_to_list (sym, &file_symbols);
1655 #ifdef C_GLBLREG /* AMD coff */
1659 SYMBOL_ACLASS_INDEX (sym) = coff_register_index;
1660 SYMBOL_VALUE (sym) = cs->c_value;
1661 add_symbol_to_list (sym, &local_symbols);
1669 SYMBOL_ACLASS_INDEX (sym) = LOC_ARG;
1670 SYMBOL_IS_ARGUMENT (sym) = 1;
1671 add_symbol_to_list (sym, &local_symbols);
1675 SYMBOL_ACLASS_INDEX (sym) = coff_register_index;
1676 SYMBOL_IS_ARGUMENT (sym) = 1;
1677 SYMBOL_VALUE (sym) = cs->c_value;
1678 add_symbol_to_list (sym, &local_symbols);
1682 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
1683 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1685 /* If type has no name, give it one. */
1686 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
1688 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1689 || TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_FUNC)
1691 /* If we are giving a name to a type such as
1692 "pointer to foo" or "function returning foo", we
1693 better not set the TYPE_NAME. If the program
1694 contains "typedef char *caddr_t;", we don't want
1695 all variables of type char * to print as caddr_t.
1696 This is not just a consequence of GDB's type
1697 management; CC and GCC (at least through version
1698 2.4) both output variables of either type char *
1699 or caddr_t with the type refering to the C_TPDEF
1700 symbol for caddr_t. If a future compiler cleans
1701 this up it GDB is not ready for it yet, but if it
1702 becomes ready we somehow need to disable this
1703 check (without breaking the PCC/GCC2.4 case).
1707 Fortunately, this check seems not to be necessary
1708 for anything except pointers or functions. */
1712 TYPE_NAME (SYMBOL_TYPE (sym)) =
1713 xstrdup (SYMBOL_LINKAGE_NAME (sym));
1716 /* Keep track of any type which points to empty structured
1717 type, so it can be filled from a definition from another
1718 file. A simple forward reference (TYPE_CODE_UNDEF) is
1719 not an empty structured type, though; the forward
1720 references work themselves out via the magic of
1721 coff_lookup_type. */
1722 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1723 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym))) == 0
1724 && TYPE_CODE (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)))
1727 int i = hashname (SYMBOL_LINKAGE_NAME (sym));
1729 SYMBOL_VALUE_CHAIN (sym) = opaque_type_chain[i];
1730 opaque_type_chain[i] = sym;
1732 add_symbol_to_list (sym, &file_symbols);
1738 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
1739 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
1741 /* Some compilers try to be helpful by inventing "fake"
1742 names for anonymous enums, structures, and unions, like
1743 "~0fake" or ".0fake". Thanks, but no thanks... */
1744 if (TYPE_TAG_NAME (SYMBOL_TYPE (sym)) == 0)
1745 if (SYMBOL_LINKAGE_NAME (sym) != NULL
1746 && *SYMBOL_LINKAGE_NAME (sym) != '~'
1747 && *SYMBOL_LINKAGE_NAME (sym) != '.')
1748 TYPE_TAG_NAME (SYMBOL_TYPE (sym)) =
1749 concat (SYMBOL_LINKAGE_NAME (sym), (char *)NULL);
1751 add_symbol_to_list (sym, &file_symbols);
1761 /* Decode a coff type specifier; return the type that is meant. */
1763 static struct type *
1764 decode_type (struct coff_symbol *cs, unsigned int c_type,
1765 union internal_auxent *aux, struct objfile *objfile)
1767 struct type *type = 0;
1768 unsigned int new_c_type;
1770 if (c_type & ~N_BTMASK)
1772 new_c_type = DECREF (c_type);
1775 type = decode_type (cs, new_c_type, aux, objfile);
1776 type = lookup_pointer_type (type);
1778 else if (ISFCN (c_type))
1780 type = decode_type (cs, new_c_type, aux, objfile);
1781 type = lookup_function_type (type);
1783 else if (ISARY (c_type))
1786 unsigned short *dim;
1787 struct type *base_type, *index_type, *range_type;
1789 /* Define an array type. */
1790 /* auxent refers to array, not base type. */
1791 if (aux->x_sym.x_tagndx.l == 0)
1794 /* Shift the indices down. */
1795 dim = &aux->x_sym.x_fcnary.x_ary.x_dimen[0];
1798 for (i = 0; *dim && i < DIMNUM - 1; i++, dim++)
1802 base_type = decode_type (cs, new_c_type, aux, objfile);
1803 index_type = objfile_type (objfile)->builtin_int;
1805 create_range_type ((struct type *) NULL,
1806 index_type, 0, n - 1);
1808 create_array_type ((struct type *) NULL,
1809 base_type, range_type);
1814 /* Reference to existing type. This only occurs with the struct,
1815 union, and enum types. EPI a29k coff fakes us out by producing
1816 aux entries with a nonzero x_tagndx for definitions of structs,
1817 unions, and enums, so we have to check the c_sclass field. SCO
1818 3.2v4 cc gets confused with pointers to pointers to defined
1819 structs, and generates negative x_tagndx fields. */
1820 if (cs->c_naux > 0 && aux->x_sym.x_tagndx.l != 0)
1822 if (cs->c_sclass != C_STRTAG
1823 && cs->c_sclass != C_UNTAG
1824 && cs->c_sclass != C_ENTAG
1825 && aux->x_sym.x_tagndx.l >= 0)
1827 type = coff_alloc_type (aux->x_sym.x_tagndx.l);
1832 complaint (&symfile_complaints,
1833 _("Symbol table entry for %s has bad tagndx value"),
1835 /* And fall through to decode_base_type... */
1839 return decode_base_type (cs, BTYPE (c_type), aux, objfile);
1842 /* Decode a coff type specifier for function definition;
1843 return the type that the function returns. */
1845 static struct type *
1846 decode_function_type (struct coff_symbol *cs,
1847 unsigned int c_type,
1848 union internal_auxent *aux,
1849 struct objfile *objfile)
1851 if (aux->x_sym.x_tagndx.l == 0)
1852 cs->c_naux = 0; /* auxent refers to function, not base
1855 return decode_type (cs, DECREF (c_type), aux, objfile);
1858 /* Basic C types. */
1860 static struct type *
1861 decode_base_type (struct coff_symbol *cs,
1862 unsigned int c_type,
1863 union internal_auxent *aux,
1864 struct objfile *objfile)
1866 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1872 /* Shows up with "void (*foo)();" structure members. */
1873 return objfile_type (objfile)->builtin_void;
1877 /* Intel 960 COFF has this symbol and meaning. */
1878 return objfile_type (objfile)->builtin_void;
1882 return objfile_type (objfile)->builtin_char;
1885 return objfile_type (objfile)->builtin_short;
1888 return objfile_type (objfile)->builtin_int;
1891 if (cs->c_sclass == C_FIELD
1892 && aux->x_sym.x_misc.x_lnsz.x_size
1893 > gdbarch_long_bit (gdbarch))
1894 return objfile_type (objfile)->builtin_long_long;
1896 return objfile_type (objfile)->builtin_long;
1899 return objfile_type (objfile)->builtin_float;
1902 return objfile_type (objfile)->builtin_double;
1905 return objfile_type (objfile)->builtin_long_double;
1908 if (cs->c_naux != 1)
1910 /* Anonymous structure type. */
1911 type = coff_alloc_type (cs->c_symnum);
1912 TYPE_CODE (type) = TYPE_CODE_STRUCT;
1913 TYPE_NAME (type) = NULL;
1914 /* This used to set the tag to "<opaque>". But I think
1915 setting it to NULL is right, and the printing code can
1916 print it as "struct {...}". */
1917 TYPE_TAG_NAME (type) = NULL;
1918 INIT_CPLUS_SPECIFIC (type);
1919 TYPE_LENGTH (type) = 0;
1920 TYPE_FIELDS (type) = 0;
1921 TYPE_NFIELDS (type) = 0;
1925 type = coff_read_struct_type (cs->c_symnum,
1926 aux->x_sym.x_misc.x_lnsz.x_size,
1927 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1933 if (cs->c_naux != 1)
1935 /* Anonymous union type. */
1936 type = coff_alloc_type (cs->c_symnum);
1937 TYPE_NAME (type) = NULL;
1938 /* This used to set the tag to "<opaque>". But I think
1939 setting it to NULL is right, and the printing code can
1940 print it as "union {...}". */
1941 TYPE_TAG_NAME (type) = NULL;
1942 INIT_CPLUS_SPECIFIC (type);
1943 TYPE_LENGTH (type) = 0;
1944 TYPE_FIELDS (type) = 0;
1945 TYPE_NFIELDS (type) = 0;
1949 type = coff_read_struct_type (cs->c_symnum,
1950 aux->x_sym.x_misc.x_lnsz.x_size,
1951 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1954 TYPE_CODE (type) = TYPE_CODE_UNION;
1958 if (cs->c_naux != 1)
1960 /* Anonymous enum type. */
1961 type = coff_alloc_type (cs->c_symnum);
1962 TYPE_CODE (type) = TYPE_CODE_ENUM;
1963 TYPE_NAME (type) = NULL;
1964 /* This used to set the tag to "<opaque>". But I think
1965 setting it to NULL is right, and the printing code can
1966 print it as "enum {...}". */
1967 TYPE_TAG_NAME (type) = NULL;
1968 TYPE_LENGTH (type) = 0;
1969 TYPE_FIELDS (type) = 0;
1970 TYPE_NFIELDS (type) = 0;
1974 type = coff_read_enum_type (cs->c_symnum,
1975 aux->x_sym.x_misc.x_lnsz.x_size,
1976 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1982 /* Shouldn't show up here. */
1986 return objfile_type (objfile)->builtin_unsigned_char;
1989 return objfile_type (objfile)->builtin_unsigned_short;
1992 return objfile_type (objfile)->builtin_unsigned_int;
1995 if (cs->c_sclass == C_FIELD
1996 && aux->x_sym.x_misc.x_lnsz.x_size
1997 > gdbarch_long_bit (gdbarch))
1998 return objfile_type (objfile)->builtin_unsigned_long_long;
2000 return objfile_type (objfile)->builtin_unsigned_long;
2002 complaint (&symfile_complaints,
2003 _("Unexpected type for symbol %s"), cs->c_name);
2004 return objfile_type (objfile)->builtin_void;
2007 /* This page contains subroutines of read_type. */
2009 /* Read the description of a structure (or union type) and return an
2010 object describing the type. */
2012 static struct type *
2013 coff_read_struct_type (int index, int length, int lastsym,
2014 struct objfile *objfile)
2018 struct nextfield *next;
2023 struct nextfield *list = 0;
2024 struct nextfield *new;
2028 struct coff_symbol member_sym;
2029 struct coff_symbol *ms = &member_sym;
2030 struct internal_syment sub_sym;
2031 union internal_auxent sub_aux;
2034 type = coff_alloc_type (index);
2035 TYPE_CODE (type) = TYPE_CODE_STRUCT;
2036 INIT_CPLUS_SPECIFIC (type);
2037 TYPE_LENGTH (type) = length;
2039 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2041 read_one_sym (ms, &sub_sym, &sub_aux);
2043 name = EXTERNAL_NAME (name, objfile->obfd);
2045 switch (ms->c_sclass)
2050 /* Get space to record the next field's data. */
2051 new = (struct nextfield *) alloca (sizeof (struct nextfield));
2055 /* Save the data. */
2056 list->field.name = obstack_copy0 (&objfile->objfile_obstack,
2057 name, strlen (name));
2058 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type,
2060 SET_FIELD_BITPOS (list->field, 8 * ms->c_value);
2061 FIELD_BITSIZE (list->field) = 0;
2067 /* Get space to record the next field's data. */
2068 new = (struct nextfield *) alloca (sizeof (struct nextfield));
2072 /* Save the data. */
2073 list->field.name = obstack_copy0 (&objfile->objfile_obstack,
2074 name, strlen (name));
2075 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type,
2077 SET_FIELD_BITPOS (list->field, ms->c_value);
2078 FIELD_BITSIZE (list->field) = sub_aux.x_sym.x_misc.x_lnsz.x_size;
2087 /* Now create the vector of fields, and record how big it is. */
2089 TYPE_NFIELDS (type) = nfields;
2090 TYPE_FIELDS (type) = (struct field *)
2091 TYPE_ALLOC (type, sizeof (struct field) * nfields);
2093 /* Copy the saved-up fields into the field vector. */
2095 for (n = nfields; list; list = list->next)
2096 TYPE_FIELD (type, --n) = list->field;
2101 /* Read a definition of an enumeration type,
2102 and create and return a suitable type object.
2103 Also defines the symbols that represent the values of the type. */
2105 static struct type *
2106 coff_read_enum_type (int index, int length, int lastsym,
2107 struct objfile *objfile)
2109 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2114 struct pending **symlist;
2115 struct coff_symbol member_sym;
2116 struct coff_symbol *ms = &member_sym;
2117 struct internal_syment sub_sym;
2118 union internal_auxent sub_aux;
2119 struct pending *osyms, *syms;
2123 int unsigned_enum = 1;
2125 type = coff_alloc_type (index);
2126 if (within_function)
2127 symlist = &local_symbols;
2129 symlist = &file_symbols;
2131 o_nsyms = osyms ? osyms->nsyms : 0;
2133 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2135 read_one_sym (ms, &sub_sym, &sub_aux);
2137 name = EXTERNAL_NAME (name, objfile->obfd);
2139 switch (ms->c_sclass)
2142 sym = allocate_symbol (objfile);
2144 SYMBOL_SET_LINKAGE_NAME (sym,
2145 obstack_copy0 (&objfile->objfile_obstack,
2146 name, strlen (name)));
2147 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
2148 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2149 SYMBOL_VALUE (sym) = ms->c_value;
2150 add_symbol_to_list (sym, symlist);
2155 /* Sometimes the linker (on 386/ix 2.0.2 at least) screws
2156 up the count of how many symbols to read. So stop
2163 /* Now fill in the fields of the type-structure. */
2166 TYPE_LENGTH (type) = length;
2167 else /* Assume ints. */
2168 TYPE_LENGTH (type) = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
2169 TYPE_CODE (type) = TYPE_CODE_ENUM;
2170 TYPE_NFIELDS (type) = nsyms;
2171 TYPE_FIELDS (type) = (struct field *)
2172 TYPE_ALLOC (type, sizeof (struct field) * nsyms);
2174 /* Find the symbols for the values and put them into the type.
2175 The symbols can be found in the symlist that we put them on
2176 to cause them to be defined. osyms contains the old value
2177 of that symlist; everything up to there was defined by us. */
2178 /* Note that we preserve the order of the enum constants, so
2179 that in something like "enum {FOO, LAST_THING=FOO}" we print
2180 FOO, not LAST_THING. */
2182 for (syms = *symlist, n = 0; syms; syms = syms->next)
2188 for (; j < syms->nsyms; j++, n++)
2190 struct symbol *xsym = syms->symbol[j];
2192 SYMBOL_TYPE (xsym) = type;
2193 TYPE_FIELD_NAME (type, n) = SYMBOL_LINKAGE_NAME (xsym);
2194 SET_FIELD_ENUMVAL (TYPE_FIELD (type, n), SYMBOL_VALUE (xsym));
2195 if (SYMBOL_VALUE (xsym) < 0)
2197 TYPE_FIELD_BITSIZE (type, n) = 0;
2204 TYPE_UNSIGNED (type) = 1;
2209 /* Register our ability to parse symbols for coff BFD files. */
2211 static const struct sym_fns coff_sym_fns =
2213 bfd_target_coff_flavour,
2214 coff_new_init, /* sym_new_init: init anything gbl to
2216 coff_symfile_init, /* sym_init: read initial info, setup
2218 coff_symfile_read, /* sym_read: read a symbol file into
2220 NULL, /* sym_read_psymbols */
2221 coff_symfile_finish, /* sym_finish: finished with file,
2223 default_symfile_offsets, /* sym_offsets: xlate external to
2225 default_symfile_segments, /* sym_segments: Get segment
2226 information from a file */
2227 NULL, /* sym_read_linetable */
2229 default_symfile_relocate, /* sym_relocate: Relocate a debug
2231 NULL, /* sym_probe_fns */
2235 /* Free the per-objfile COFF data. */
2238 coff_free_info (struct objfile *objfile, void *arg)
2244 _initialize_coffread (void)
2246 add_symtab_fns (&coff_sym_fns);
2248 coff_objfile_data_key = register_objfile_data_with_cleanup (NULL,
2252 = register_symbol_register_impl (LOC_REGISTER, &coff_register_funcs);