1 /* Read coff symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
3 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009,
4 2010, 2011 Free Software Foundation, Inc.
5 Contributed by David D. Johnson, Brown University (ddj@cs.brown.edu).
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "breakpoint.h"
29 #include "gdb_obstack.h"
31 #include "gdb_string.h"
34 #include "coff/internal.h" /* Internal format of COFF symbols in BFD */
35 #include "libcoff.h" /* FIXME secret internal data from BFD */
38 #include "gdb-stabs.h"
39 #include "stabsread.h"
40 #include "complaints.h"
42 #include "gdb_assert.h"
44 #include "dictionary.h"
46 #include "coff-pe-read.h"
50 extern void _initialize_coffread (void);
52 struct coff_symfile_info
54 file_ptr min_lineno_offset; /* Where in file lowest line#s are. */
55 file_ptr max_lineno_offset; /* 1+last byte of line#s in file. */
57 CORE_ADDR textaddr; /* Addr of .text section. */
58 unsigned int textsize; /* Size of .text section. */
59 struct stab_section_list *stabsects; /* .stab sections. */
60 asection *stabstrsect; /* Section pointer for .stab section. */
64 /* Translate an external name string into a user-visible name. */
65 #define EXTERNAL_NAME(string, abfd) \
66 (string[0] == bfd_get_symbol_leading_char (abfd) \
67 ? string + 1 : string)
69 /* To be an sdb debug type, type must have at least a basic or primary
70 derived type. Using this rather than checking against T_NULL is
71 said to prevent core dumps if we try to operate on Michael Bloom
74 #define SDB_TYPE(type) (BTYPE(type) | (type & N_TMASK))
76 /* Core address of start and end of text of current source file.
77 This comes from a ".text" symbol where x_nlinno > 0. */
79 static CORE_ADDR current_source_start_addr;
80 static CORE_ADDR current_source_end_addr;
82 /* The addresses of the symbol table stream and number of symbols
83 of the object file we are reading (as copied into core). */
85 static bfd *nlist_bfd_global;
86 static int nlist_nsyms_global;
89 /* Pointers to scratch storage, used for reading raw symbols and
92 static char *temp_sym;
93 static char *temp_aux;
95 /* Local variables that hold the shift and mask values for the
96 COFF file that we are currently reading. These come back to us
97 from BFD, and are referenced by their macro names, as well as
98 internally to the BTYPE, ISPTR, ISFCN, ISARY, ISTAG, and DECREF
99 macros from include/coff/internal.h . */
101 static unsigned local_n_btmask;
102 static unsigned local_n_btshft;
103 static unsigned local_n_tmask;
104 static unsigned local_n_tshift;
106 #define N_BTMASK local_n_btmask
107 #define N_BTSHFT local_n_btshft
108 #define N_TMASK local_n_tmask
109 #define N_TSHIFT local_n_tshift
111 /* Local variables that hold the sizes in the file of various COFF
112 structures. (We only need to know this to read them from the file
113 -- BFD will then translate the data in them, into `internal_xxx'
114 structs in the right byte order, alignment, etc.) */
116 static unsigned local_linesz;
117 static unsigned local_symesz;
118 static unsigned local_auxesz;
120 /* This is set if this is a PE format file. */
124 /* Chain of typedefs of pointers to empty struct/union types.
125 They are chained thru the SYMBOL_VALUE_CHAIN. */
127 static struct symbol *opaque_type_chain[HASHSIZE];
129 /* Simplified internal version of coff symbol table information. */
134 int c_symnum; /* Symbol number of this entry. */
135 int c_naux; /* 0 if syment only, 1 if syment +
143 extern void stabsread_clear_cache (void);
145 static struct type *coff_read_struct_type (int, int, int,
148 static struct type *decode_base_type (struct coff_symbol *,
150 union internal_auxent *,
153 static struct type *decode_type (struct coff_symbol *, unsigned int,
154 union internal_auxent *,
157 static struct type *decode_function_type (struct coff_symbol *,
159 union internal_auxent *,
162 static struct type *coff_read_enum_type (int, int, int,
165 static struct symbol *process_coff_symbol (struct coff_symbol *,
166 union internal_auxent *,
169 static void patch_opaque_types (struct symtab *);
171 static void enter_linenos (long, int, int, struct objfile *);
173 static void free_linetab (void);
175 static void free_linetab_cleanup (void *ignore);
177 static int init_lineno (bfd *, long, int);
179 static char *getsymname (struct internal_syment *);
181 static char *coff_getfilename (union internal_auxent *);
183 static void free_stringtab (void);
185 static void free_stringtab_cleanup (void *ignore);
187 static int init_stringtab (bfd *, long);
189 static void read_one_sym (struct coff_symbol *,
190 struct internal_syment *,
191 union internal_auxent *);
193 static void coff_symtab_read (long, unsigned int, struct objfile *);
195 /* We are called once per section from coff_symfile_read. We
196 need to examine each section we are passed, check to see
197 if it is something we are interested in processing, and
198 if so, stash away some access information for the section.
200 FIXME: The section names should not be hardwired strings (what
201 should they be? I don't think most object file formats have enough
202 section flags to specify what kind of debug section it is
206 coff_locate_sections (bfd *abfd, asection *sectp, void *csip)
208 struct coff_symfile_info *csi;
211 csi = (struct coff_symfile_info *) csip;
212 name = bfd_get_section_name (abfd, sectp);
213 if (strcmp (name, ".text") == 0)
215 csi->textaddr = bfd_section_vma (abfd, sectp);
216 csi->textsize += bfd_section_size (abfd, sectp);
218 else if (strncmp (name, ".text", sizeof ".text" - 1) == 0)
220 csi->textsize += bfd_section_size (abfd, sectp);
222 else if (strcmp (name, ".stabstr") == 0)
224 csi->stabstrsect = sectp;
226 else if (strncmp (name, ".stab", sizeof ".stab" - 1) == 0)
230 /* We can have multiple .stab sections if linked with
232 for (s = name + sizeof ".stab" - 1; *s != '\0'; s++)
237 struct stab_section_list *n, **pn;
239 n = ((struct stab_section_list *)
240 xmalloc (sizeof (struct stab_section_list)));
243 for (pn = &csi->stabsects; *pn != NULL; pn = &(*pn)->next)
247 /* This will be run after coffstab_build_psymtabs is called
248 in coff_symfile_read, at which point we no longer need
250 make_cleanup (xfree, n);
255 /* Return the section_offsets* that CS points to. */
256 static int cs_to_section (struct coff_symbol *, struct objfile *);
258 struct find_targ_sec_arg
265 find_targ_sec (bfd *abfd, asection *sect, void *obj)
267 struct find_targ_sec_arg *args = (struct find_targ_sec_arg *) obj;
269 if (sect->target_index == args->targ_index)
270 *args->resultp = sect;
273 /* Return the bfd_section that CS points to. */
274 static struct bfd_section*
275 cs_to_bfd_section (struct coff_symbol *cs, struct objfile *objfile)
277 asection *sect = NULL;
278 struct find_targ_sec_arg args;
280 args.targ_index = cs->c_secnum;
281 args.resultp = §
282 bfd_map_over_sections (objfile->obfd, find_targ_sec, &args);
286 /* Return the section number (SECT_OFF_*) that CS points to. */
288 cs_to_section (struct coff_symbol *cs, struct objfile *objfile)
290 asection *sect = cs_to_bfd_section (cs, objfile);
293 return SECT_OFF_TEXT (objfile);
297 /* Return the address of the section of a COFF symbol. */
299 static CORE_ADDR cs_section_address (struct coff_symbol *, bfd *);
302 cs_section_address (struct coff_symbol *cs, bfd *abfd)
304 asection *sect = NULL;
305 struct find_targ_sec_arg args;
308 args.targ_index = cs->c_secnum;
309 args.resultp = §
310 bfd_map_over_sections (abfd, find_targ_sec, &args);
312 addr = bfd_get_section_vma (objfile->obfd, sect);
316 /* Look up a coff type-number index. Return the address of the slot
317 where the type for that index is stored.
318 The type-number is in INDEX.
320 This can be used for finding the type associated with that index
321 or for associating a new type with the index. */
323 static struct type **
324 coff_lookup_type (int index)
326 if (index >= type_vector_length)
328 int old_vector_length = type_vector_length;
330 type_vector_length *= 2;
331 if (index /* is still */ >= type_vector_length)
332 type_vector_length = index * 2;
334 type_vector = (struct type **)
335 xrealloc ((char *) type_vector,
336 type_vector_length * sizeof (struct type *));
337 memset (&type_vector[old_vector_length], 0,
338 (type_vector_length - old_vector_length) * sizeof (struct type *));
340 return &type_vector[index];
343 /* Make sure there is a type allocated for type number index
344 and return the type object.
345 This can create an empty (zeroed) type object. */
348 coff_alloc_type (int index)
350 struct type **type_addr = coff_lookup_type (index);
351 struct type *type = *type_addr;
353 /* If we are referring to a type not known at all yet,
354 allocate an empty type for it.
355 We will fill it in later if we find out how. */
358 type = alloc_type (current_objfile);
364 /* Start a new symtab for a new source file.
365 This is called when a COFF ".file" symbol is seen;
366 it indicates the start of data for one original source file. */
369 coff_start_symtab (char *name)
372 /* We fill in the filename later. start_symtab puts this pointer
373 into last_source_file and we put it in subfiles->name, which
374 end_symtab frees; that's why it must be malloc'd. */
376 /* We never know the directory name for COFF. */
378 /* The start address is irrelevant, since we set
379 last_source_start_addr in coff_end_symtab. */
381 record_debugformat ("COFF");
384 /* Save the vital information from when starting to read a file,
385 for use when closing off the current file.
386 NAME is the file name the symbols came from, START_ADDR is the
387 first text address for the file, and SIZE is the number of bytes of
391 complete_symtab (char *name, CORE_ADDR start_addr, unsigned int size)
393 if (last_source_file != NULL)
394 xfree (last_source_file);
395 last_source_file = xstrdup (name);
396 current_source_start_addr = start_addr;
397 current_source_end_addr = start_addr + size;
400 /* Finish the symbol definitions for one main source file, close off
401 all the lexical contexts for that file (creating struct block's for
402 them), then make the struct symtab for that file and put it in the
406 coff_end_symtab (struct objfile *objfile)
408 last_source_start_addr = current_source_start_addr;
410 end_symtab (current_source_end_addr, objfile,
411 SECT_OFF_TEXT (objfile));
413 /* Reinitialize for beginning of new file. */
414 last_source_file = NULL;
417 static struct minimal_symbol *
418 record_minimal_symbol (struct coff_symbol *cs, CORE_ADDR address,
419 enum minimal_symbol_type type, int section,
420 struct objfile *objfile)
422 struct bfd_section *bfd_section;
424 /* We don't want TDESC entry points in the minimal symbol table. */
425 if (cs->c_name[0] == '@')
428 bfd_section = cs_to_bfd_section (cs, objfile);
429 return prim_record_minimal_symbol_and_info (cs->c_name, address,
431 bfd_section, objfile);
434 /* coff_symfile_init ()
435 is the coff-specific initialization routine for reading symbols.
436 It is passed a struct objfile which contains, among other things,
437 the BFD for the file whose symbols are being read, and a slot for
438 a pointer to "private data" which we fill with cookies and other
439 treats for coff_symfile_read ().
441 We will only be called if this is a COFF or COFF-like file. BFD
442 handles figuring out the format of the file, and code in symtab.c
443 uses BFD's determination to vector to us.
445 The ultimate result is a new symtab (or, FIXME, eventually a
449 coff_symfile_init (struct objfile *objfile)
451 /* Allocate struct to keep track of stab reading. */
452 objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *)
453 xmalloc (sizeof (struct dbx_symfile_info));
455 memset (objfile->deprecated_sym_stab_info, 0,
456 sizeof (struct dbx_symfile_info));
458 /* Allocate struct to keep track of the symfile. */
459 objfile->deprecated_sym_private
460 = xmalloc (sizeof (struct coff_symfile_info));
462 memset (objfile->deprecated_sym_private, 0,
463 sizeof (struct coff_symfile_info));
465 /* COFF objects may be reordered, so set OBJF_REORDERED. If we
466 find this causes a significant slowdown in gdb then we could
467 set it in the debug symbol readers only when necessary. */
468 objfile->flags |= OBJF_REORDERED;
470 init_entry_point_info (objfile);
473 /* This function is called for every section; it finds the outer
474 limits of the line table (minimum and maximum file offset) so that
475 the mainline code can read the whole thing for efficiency. */
478 find_linenos (bfd *abfd, struct bfd_section *asect, void *vpinfo)
480 struct coff_symfile_info *info;
482 file_ptr offset, maxoff;
484 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
485 count = asect->lineno_count;
486 /* End of warning. */
490 size = count * local_linesz;
492 info = (struct coff_symfile_info *) vpinfo;
493 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
494 offset = asect->line_filepos;
495 /* End of warning. */
497 if (offset < info->min_lineno_offset || info->min_lineno_offset == 0)
498 info->min_lineno_offset = offset;
500 maxoff = offset + size;
501 if (maxoff > info->max_lineno_offset)
502 info->max_lineno_offset = maxoff;
506 /* The BFD for this file -- only good while we're actively reading
507 symbols into a psymtab or a symtab. */
509 static bfd *symfile_bfd;
511 /* Read a symbol file, after initialization by coff_symfile_init. */
514 coff_symfile_read (struct objfile *objfile, int symfile_flags)
516 struct coff_symfile_info *info;
517 struct dbx_symfile_info *dbxinfo;
518 bfd *abfd = objfile->obfd;
519 coff_data_type *cdata = coff_data (abfd);
520 char *name = bfd_get_filename (abfd);
522 unsigned int num_symbols;
524 int stringtab_offset;
525 struct cleanup *back_to, *cleanup_minimal_symbols;
528 info = (struct coff_symfile_info *) objfile->deprecated_sym_private;
529 dbxinfo = objfile->deprecated_sym_stab_info;
530 symfile_bfd = abfd; /* Kludge for swap routines. */
532 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
533 num_symbols = bfd_get_symcount (abfd); /* How many syms */
534 symtab_offset = cdata->sym_filepos; /* Symbol table file offset */
535 stringtab_offset = symtab_offset + /* String table file offset */
536 num_symbols * cdata->local_symesz;
538 /* Set a few file-statics that give us specific information about
539 the particular COFF file format we're reading. */
540 local_n_btmask = cdata->local_n_btmask;
541 local_n_btshft = cdata->local_n_btshft;
542 local_n_tmask = cdata->local_n_tmask;
543 local_n_tshift = cdata->local_n_tshift;
544 local_linesz = cdata->local_linesz;
545 local_symesz = cdata->local_symesz;
546 local_auxesz = cdata->local_auxesz;
548 /* Allocate space for raw symbol and aux entries, based on their
549 space requirements as reported by BFD. */
550 temp_sym = (char *) xmalloc
551 (cdata->local_symesz + cdata->local_auxesz);
552 temp_aux = temp_sym + cdata->local_symesz;
553 back_to = make_cleanup (free_current_contents, &temp_sym);
555 /* We need to know whether this is a PE file, because in PE files,
556 unlike standard COFF files, symbol values are stored as offsets
557 from the section address, rather than as absolute addresses.
558 FIXME: We should use BFD to read the symbol table, and thus avoid
561 strncmp (bfd_get_target (objfile->obfd), "pe", 2) == 0
562 || strncmp (bfd_get_target (objfile->obfd), "epoc-pe", 7) == 0;
564 /* End of warning. */
566 info->min_lineno_offset = 0;
567 info->max_lineno_offset = 0;
569 /* Only read line number information if we have symbols.
571 On Windows NT, some of the system's DLL's have sections with
572 PointerToLinenumbers fields that are non-zero, but point at
573 random places within the image file. (In the case I found,
574 KERNEL32.DLL's .text section has a line number info pointer that
575 points into the middle of the string `lib\\i386\kernel32.dll'.)
577 However, these DLL's also have no symbols. The line number
578 tables are meaningless without symbols. And in fact, GDB never
579 uses the line number information unless there are symbols. So we
580 can avoid spurious error messages (and maybe run a little
581 faster!) by not even reading the line number table unless we have
585 /* Read the line number table, all at once. */
586 bfd_map_over_sections (abfd, find_linenos, (void *) info);
588 make_cleanup (free_linetab_cleanup, 0 /*ignore*/);
589 val = init_lineno (abfd, info->min_lineno_offset,
590 info->max_lineno_offset - info->min_lineno_offset);
592 error (_("\"%s\": error reading line numbers."), name);
595 /* Now read the string table, all at once. */
597 make_cleanup (free_stringtab_cleanup, 0 /*ignore*/);
598 val = init_stringtab (abfd, stringtab_offset);
600 error (_("\"%s\": can't get string table"), name);
602 init_minimal_symbol_collection ();
603 cleanup_minimal_symbols = make_cleanup_discard_minimal_symbols ();
605 /* Now that the executable file is positioned at symbol table,
606 process it and define symbols accordingly. */
608 coff_symtab_read ((long) symtab_offset, num_symbols, objfile);
610 /* Install any minimal symbols that have been collected as the
611 current minimal symbols for this objfile. */
613 install_minimal_symbols (objfile);
615 /* Free the installed minimal symbol data. */
616 do_cleanups (cleanup_minimal_symbols);
618 bfd_map_over_sections (abfd, coff_locate_sections, (void *) info);
622 if (!info->stabstrsect)
624 error (_("The debugging information in `%s' is corrupted.\nThe "
625 "file has a `.stabs' section, but no `.stabstr' section."),
629 /* FIXME: dubious. Why can't we use something normal like
630 bfd_get_section_contents? */
631 bfd_seek (abfd, abfd->where, 0);
633 stabstrsize = bfd_section_size (abfd, info->stabstrsect);
635 coffstab_build_psymtabs (objfile,
636 info->textaddr, info->textsize,
638 info->stabstrsect->filepos, stabstrsize);
640 if (dwarf2_has_info (objfile))
642 /* DWARF2 sections. */
643 dwarf2_build_psymtabs (objfile);
646 dwarf2_build_frame_info (objfile);
648 /* Try to add separate debug file if no symbols table found. */
649 if (!objfile_has_partial_symbols (objfile))
653 debugfile = find_separate_debug_file_by_debuglink (objfile);
657 bfd *abfd = symfile_bfd_open (debugfile);
659 symbol_file_add_separate (abfd, symfile_flags, objfile);
664 do_cleanups (back_to);
668 coff_new_init (struct objfile *ignore)
672 /* Perform any local cleanups required when we are done with a
673 particular objfile. I.E, we are in the process of discarding all
674 symbol information for an objfile, freeing up all memory held for
675 it, and unlinking the objfile struct from the global list of known
679 coff_symfile_finish (struct objfile *objfile)
681 if (objfile->deprecated_sym_private != NULL)
683 xfree (objfile->deprecated_sym_private);
686 /* Let stabs reader clean up. */
687 stabsread_clear_cache ();
689 dwarf2_free_objfile (objfile);
693 /* Given pointers to a symbol table in coff style exec file,
694 analyze them and create struct symtab's describing the symbols.
695 NSYMS is the number of symbols in the symbol table.
696 We read them one at a time using read_one_sym (). */
699 coff_symtab_read (long symtab_offset, unsigned int nsyms,
700 struct objfile *objfile)
702 struct gdbarch *gdbarch = get_objfile_arch (objfile);
703 struct context_stack *new;
704 struct coff_symbol coff_symbol;
705 struct coff_symbol *cs = &coff_symbol;
706 static struct internal_syment main_sym;
707 static union internal_auxent main_aux;
708 struct coff_symbol fcn_cs_saved;
709 static struct internal_syment fcn_sym_saved;
710 static union internal_auxent fcn_aux_saved;
712 /* A .file is open. */
713 int in_source_file = 0;
714 int next_file_symnum = -1;
715 /* Name of the current file. */
716 char *filestring = "";
718 int fcn_first_line = 0;
719 CORE_ADDR fcn_first_line_addr = 0;
720 int fcn_last_line = 0;
721 int fcn_start_addr = 0;
722 long fcn_line_ptr = 0;
725 struct minimal_symbol *msym;
727 /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous....
728 it's hard to know I've really worked around it. The fix should
729 be harmless, anyway). The symptom of the bug is that the first
730 fread (in read_one_sym), will (in my example) actually get data
731 from file offset 268, when the fseek was to 264 (and ftell shows
732 264). This causes all hell to break loose. I was unable to
733 reproduce this on a short test program which operated on the same
734 file, performing (I think) the same sequence of operations.
736 It stopped happening when I put in this (former) rewind().
738 FIXME: Find out if this has been reported to Sun, whether it has
739 been fixed in a later release, etc. */
741 bfd_seek (objfile->obfd, 0, 0);
743 /* Position to read the symbol table. */
744 val = bfd_seek (objfile->obfd, (long) symtab_offset, 0);
746 perror_with_name (objfile->name);
748 current_objfile = objfile;
749 nlist_bfd_global = objfile->obfd;
750 nlist_nsyms_global = nsyms;
751 last_source_file = NULL;
752 memset (opaque_type_chain, 0, sizeof opaque_type_chain);
754 if (type_vector) /* Get rid of previous one. */
756 type_vector_length = 160;
757 type_vector = (struct type **)
758 xmalloc (type_vector_length * sizeof (struct type *));
759 memset (type_vector, 0, type_vector_length * sizeof (struct type *));
761 coff_start_symtab ("");
764 while (symnum < nsyms)
766 QUIT; /* Make this command interruptable. */
768 read_one_sym (cs, &main_sym, &main_aux);
770 if (cs->c_symnum == next_file_symnum && cs->c_sclass != C_FILE)
772 if (last_source_file)
773 coff_end_symtab (objfile);
775 coff_start_symtab ("_globals_");
776 /* coff_start_symtab will set the language of this symtab to
777 language_unknown, since such a ``file name'' is not
778 recognized. Override that with the minimal language to
779 allow printing values in this symtab. */
780 current_subfile->language = language_minimal;
781 complete_symtab ("_globals_", 0, 0);
782 /* Done with all files, everything from here on out is
786 /* Special case for file with type declarations only, no
788 if (!last_source_file && SDB_TYPE (cs->c_type)
789 && cs->c_secnum == N_DEBUG)
790 complete_symtab (filestring, 0, 0);
792 /* Typedefs should not be treated as symbol definitions. */
793 if (ISFCN (cs->c_type) && cs->c_sclass != C_TPDEF)
795 /* Record all functions -- external and static -- in
797 int section = cs_to_section (cs, objfile);
799 tmpaddr = cs->c_value + ANOFFSET (objfile->section_offsets,
800 SECT_OFF_TEXT (objfile));
801 record_minimal_symbol (cs, tmpaddr, mst_text,
804 fcn_line_ptr = main_aux.x_sym.x_fcnary.x_fcn.x_lnnoptr;
805 fcn_start_addr = tmpaddr;
807 fcn_sym_saved = main_sym;
808 fcn_aux_saved = main_aux;
812 switch (cs->c_sclass)
821 complaint (&symfile_complaints,
822 _("Bad n_sclass for symbol %s"),
827 /* c_value field contains symnum of next .file entry in
828 table or symnum of first global after last .file. */
829 next_file_symnum = cs->c_value;
831 filestring = coff_getfilename (&main_aux);
835 /* Complete symbol table for last object file
836 containing debugging information. */
837 if (last_source_file)
839 coff_end_symtab (objfile);
840 coff_start_symtab (filestring);
845 /* C_LABEL is used for labels and static functions.
846 Including it here allows gdb to see static functions when
847 no debug info is available. */
849 /* However, labels within a function can make weird
850 backtraces, so filter them out (from phdm@macqel.be). */
856 case C_THUMBSTATFUNC:
857 if (cs->c_name[0] == '.')
859 if (strcmp (cs->c_name, ".text") == 0)
861 /* FIXME: don't wire in ".text" as section name or
863 /* Check for in_source_file deals with case of a
864 file with debugging symbols followed by a later
865 file with no symbols. */
867 complete_symtab (filestring,
868 cs->c_value + ANOFFSET (objfile->section_offsets,
869 SECT_OFF_TEXT (objfile)),
870 main_aux.x_scn.x_scnlen);
873 /* Flush rest of '.' symbols. */
876 else if (!SDB_TYPE (cs->c_type)
877 && cs->c_name[0] == 'L'
878 && (strncmp (cs->c_name, "LI%", 3) == 0
879 || strncmp (cs->c_name, "LF%", 3) == 0
880 || strncmp (cs->c_name, "LC%", 3) == 0
881 || strncmp (cs->c_name, "LP%", 3) == 0
882 || strncmp (cs->c_name, "LPB%", 4) == 0
883 || strncmp (cs->c_name, "LBB%", 4) == 0
884 || strncmp (cs->c_name, "LBE%", 4) == 0
885 || strncmp (cs->c_name, "LPBX%", 5) == 0))
886 /* At least on a 3b1, gcc generates swbeg and string labels
887 that look like this. Ignore them. */
889 /* Fall in for static symbols that don't start with '.' */
894 /* Record it in the minimal symbols regardless of
895 SDB_TYPE. This parallels what we do for other debug
896 formats, and probably is needed to make
897 print_address_symbolic work right without the (now
898 gone) "set fast-symbolic-addr off" kludge. */
900 enum minimal_symbol_type ms_type;
903 if (cs->c_secnum == N_UNDEF)
905 /* This is a common symbol. See if the target
906 environment knows where it has been relocated to. */
909 if (target_lookup_symbol (cs->c_name, &reladdr))
911 /* Error in lookup; ignore symbol. */
915 /* The address has already been relocated; make sure that
916 objfile_relocate doesn't relocate it again. */
918 ms_type = cs->c_sclass == C_EXT
919 || cs->c_sclass == C_THUMBEXT ?
920 mst_bss : mst_file_bss;
922 else if (cs->c_secnum == N_ABS)
924 /* Use the correct minimal symbol type (and don't
925 relocate) for absolute values. */
927 sec = cs_to_section (cs, objfile);
928 tmpaddr = cs->c_value;
932 asection *bfd_section = cs_to_bfd_section (cs, objfile);
934 sec = cs_to_section (cs, objfile);
935 tmpaddr = cs->c_value;
936 /* Statics in a PE file also get relocated. */
937 if (cs->c_sclass == C_EXT
938 || cs->c_sclass == C_THUMBEXTFUNC
939 || cs->c_sclass == C_THUMBEXT
940 || (pe_file && (cs->c_sclass == C_STAT)))
941 tmpaddr += ANOFFSET (objfile->section_offsets, sec);
943 if (bfd_section->flags & SEC_CODE)
946 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC
947 || cs->c_sclass == C_THUMBEXT ?
948 mst_text : mst_file_text;
949 tmpaddr = gdbarch_smash_text_address (gdbarch, tmpaddr);
951 else if (bfd_section->flags & SEC_ALLOC
952 && bfd_section->flags & SEC_LOAD)
955 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
956 ? mst_data : mst_file_data;
958 else if (bfd_section->flags & SEC_ALLOC)
961 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
962 ? mst_bss : mst_file_bss;
965 ms_type = mst_unknown;
968 msym = record_minimal_symbol (cs, tmpaddr, ms_type,
971 gdbarch_coff_make_msymbol_special (gdbarch,
974 if (SDB_TYPE (cs->c_type))
978 sym = process_coff_symbol
979 (cs, &main_aux, objfile);
980 SYMBOL_VALUE (sym) = tmpaddr;
981 SYMBOL_SECTION (sym) = sec;
987 if (strcmp (cs->c_name, ".bf") == 0)
991 /* Value contains address of first non-init type
993 /* main_aux.x_sym.x_misc.x_lnsz.x_lnno
994 contains line number of '{' }. */
996 complaint (&symfile_complaints,
997 _("`.bf' symbol %d has no aux entry"),
999 fcn_first_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1000 fcn_first_line_addr = cs->c_value;
1002 /* Might want to check that locals are 0 and
1003 context_stack_depth is zero, and complain if not. */
1006 new = push_context (depth, fcn_start_addr);
1007 fcn_cs_saved.c_name = getsymname (&fcn_sym_saved);
1009 process_coff_symbol (&fcn_cs_saved,
1010 &fcn_aux_saved, objfile);
1012 else if (strcmp (cs->c_name, ".ef") == 0)
1014 if (!within_function)
1015 error (_("Bad coff function information."));
1016 /* The value of .ef is the address of epilogue code;
1017 not useful for gdb. */
1018 /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
1019 contains number of lines to '}' */
1021 if (context_stack_depth <= 0)
1022 { /* We attempted to pop an empty context stack. */
1023 complaint (&symfile_complaints,
1024 _("`.ef' symbol without matching `.bf' "
1025 "symbol ignored starting at symnum %d"),
1027 within_function = 0;
1031 new = pop_context ();
1032 /* Stack must be empty now. */
1033 if (context_stack_depth > 0 || new == NULL)
1035 complaint (&symfile_complaints,
1036 _("Unmatched .ef symbol(s) ignored "
1037 "starting at symnum %d"),
1039 within_function = 0;
1042 if (cs->c_naux != 1)
1044 complaint (&symfile_complaints,
1045 _("`.ef' symbol %d has no aux entry"),
1047 fcn_last_line = 0x7FFFFFFF;
1051 fcn_last_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1053 /* fcn_first_line is the line number of the opening '{'.
1054 Do not record it - because it would affect gdb's idea
1055 of the line number of the first statement of the
1056 function - except for one-line functions, for which
1057 it is also the line number of all the statements and
1058 of the closing '}', and for which we do not have any
1059 other statement-line-number. */
1060 if (fcn_last_line == 1)
1061 record_line (current_subfile, fcn_first_line,
1062 gdbarch_addr_bits_remove (gdbarch,
1063 fcn_first_line_addr));
1065 enter_linenos (fcn_line_ptr, fcn_first_line,
1066 fcn_last_line, objfile);
1068 finish_block (new->name, &local_symbols,
1069 new->old_blocks, new->start_addr,
1070 fcn_cs_saved.c_value
1071 + fcn_aux_saved.x_sym.x_misc.x_fsize
1072 + ANOFFSET (objfile->section_offsets,
1073 SECT_OFF_TEXT (objfile)),
1076 within_function = 0;
1081 if (strcmp (cs->c_name, ".bb") == 0)
1083 tmpaddr = cs->c_value;
1084 tmpaddr += ANOFFSET (objfile->section_offsets,
1085 SECT_OFF_TEXT (objfile));
1086 push_context (++depth, tmpaddr);
1088 else if (strcmp (cs->c_name, ".eb") == 0)
1090 if (context_stack_depth <= 0)
1091 { /* We attempted to pop an empty context stack. */
1092 complaint (&symfile_complaints,
1093 _("`.eb' symbol without matching `.bb' "
1094 "symbol ignored starting at symnum %d"),
1099 new = pop_context ();
1100 if (depth-- != new->depth)
1102 complaint (&symfile_complaints,
1103 _("Mismatched .eb symbol ignored "
1104 "starting at symnum %d"),
1108 if (local_symbols && context_stack_depth > 0)
1111 cs->c_value + ANOFFSET (objfile->section_offsets,
1112 SECT_OFF_TEXT (objfile));
1113 /* Make a block for the local symbols within. */
1114 finish_block (0, &local_symbols, new->old_blocks,
1115 new->start_addr, tmpaddr, objfile);
1117 /* Now pop locals of block just finished. */
1118 local_symbols = new->locals;
1123 process_coff_symbol (cs, &main_aux, objfile);
1128 if ((nsyms == 0) && (pe_file))
1130 /* We've got no debugging symbols, but it's a portable
1131 executable, so try to read the export table. */
1132 read_pe_exported_syms (objfile);
1135 if (last_source_file)
1136 coff_end_symtab (objfile);
1138 /* Patch up any opaque types (references to types that are not defined
1139 in the file where they are referenced, e.g. "struct foo *bar"). */
1140 ALL_OBJFILE_SYMTABS (objfile, s)
1141 patch_opaque_types (s);
1143 current_objfile = NULL;
1146 /* Routines for reading headers and symbols from executable. */
1148 /* Read the next symbol, swap it, and return it in both
1149 internal_syment form, and coff_symbol form. Also return its first
1150 auxent, if any, in internal_auxent form, and skip any other
1154 read_one_sym (struct coff_symbol *cs,
1155 struct internal_syment *sym,
1156 union internal_auxent *aux)
1159 bfd_size_type bytes;
1161 cs->c_symnum = symnum;
1162 bytes = bfd_bread (temp_sym, local_symesz, nlist_bfd_global);
1163 if (bytes != local_symesz)
1164 error (_("%s: error reading symbols"), current_objfile->name);
1165 bfd_coff_swap_sym_in (symfile_bfd, temp_sym, (char *) sym);
1166 cs->c_naux = sym->n_numaux & 0xff;
1167 if (cs->c_naux >= 1)
1169 bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1170 if (bytes != local_auxesz)
1171 error (_("%s: error reading symbols"), current_objfile->name);
1172 bfd_coff_swap_aux_in (symfile_bfd, temp_aux,
1173 sym->n_type, sym->n_sclass,
1174 0, cs->c_naux, (char *) aux);
1175 /* If more than one aux entry, read past it (only the first aux
1177 for (i = 1; i < cs->c_naux; i++)
1179 bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1180 if (bytes != local_auxesz)
1181 error (_("%s: error reading symbols"), current_objfile->name);
1184 cs->c_name = getsymname (sym);
1185 cs->c_value = sym->n_value;
1186 cs->c_sclass = (sym->n_sclass & 0xff);
1187 cs->c_secnum = sym->n_scnum;
1188 cs->c_type = (unsigned) sym->n_type;
1189 if (!SDB_TYPE (cs->c_type))
1193 if (cs->c_sclass & 128)
1194 printf (_("thumb symbol %s, class 0x%x\n"), cs->c_name, cs->c_sclass);
1197 symnum += 1 + cs->c_naux;
1199 /* The PE file format stores symbol values as offsets within the
1200 section, rather than as absolute addresses. We correct that
1201 here, if the symbol has an appropriate storage class. FIXME: We
1202 should use BFD to read the symbols, rather than duplicating the
1206 switch (cs->c_sclass)
1210 case C_THUMBEXTFUNC:
1215 case C_THUMBSTATFUNC:
1221 if (cs->c_secnum != 0)
1222 cs->c_value += cs_section_address (cs, symfile_bfd);
1228 /* Support for string table handling. */
1230 static char *stringtab = NULL;
1233 init_stringtab (bfd *abfd, long offset)
1237 unsigned char lengthbuf[4];
1241 /* If the file is stripped, the offset might be zero, indicating no
1242 string table. Just return with `stringtab' set to null. */
1246 if (bfd_seek (abfd, offset, 0) < 0)
1249 val = bfd_bread ((char *) lengthbuf, sizeof lengthbuf, abfd);
1250 length = bfd_h_get_32 (symfile_bfd, lengthbuf);
1252 /* If no string table is needed, then the file may end immediately
1253 after the symbols. Just return with `stringtab' set to null. */
1254 if (val != sizeof lengthbuf || length < sizeof lengthbuf)
1257 stringtab = (char *) xmalloc (length);
1258 /* This is in target format (probably not very useful, and not
1259 currently used), not host format. */
1260 memcpy (stringtab, lengthbuf, sizeof lengthbuf);
1261 if (length == sizeof length) /* Empty table -- just the count. */
1264 val = bfd_bread (stringtab + sizeof lengthbuf,
1265 length - sizeof lengthbuf, abfd);
1266 if (val != length - sizeof lengthbuf || stringtab[length - 1] != '\0')
1273 free_stringtab (void)
1281 free_stringtab_cleanup (void *ignore)
1287 getsymname (struct internal_syment *symbol_entry)
1289 static char buffer[SYMNMLEN + 1];
1292 if (symbol_entry->_n._n_n._n_zeroes == 0)
1294 /* FIXME: Probably should be detecting corrupt symbol files by
1295 seeing whether offset points to within the stringtab. */
1296 result = stringtab + symbol_entry->_n._n_n._n_offset;
1300 strncpy (buffer, symbol_entry->_n._n_name, SYMNMLEN);
1301 buffer[SYMNMLEN] = '\0';
1307 /* Extract the file name from the aux entry of a C_FILE symbol.
1308 Return only the last component of the name. Result is in static
1309 storage and is only good for temporary use. */
1312 coff_getfilename (union internal_auxent *aux_entry)
1314 static char buffer[BUFSIZ];
1318 if (aux_entry->x_file.x_n.x_zeroes == 0)
1320 if (strlen (stringtab + aux_entry->x_file.x_n.x_offset) >= BUFSIZ)
1321 internal_error (__FILE__, __LINE__, _("coff file name too long"));
1322 strcpy (buffer, stringtab + aux_entry->x_file.x_n.x_offset);
1326 strncpy (buffer, aux_entry->x_file.x_fname, FILNMLEN);
1327 buffer[FILNMLEN] = '\0';
1331 /* FIXME: We should not be throwing away the information about what
1332 directory. It should go into dirname of the symtab, or some such
1334 if ((temp = strrchr (result, '/')) != NULL)
1339 /* Support for line number handling. */
1341 static char *linetab = NULL;
1342 static long linetab_offset;
1343 static unsigned long linetab_size;
1345 /* Read in all the line numbers for fast lookups later. Leave them in
1346 external (unswapped) format in memory; we'll swap them as we enter
1347 them into GDB's data structures. */
1350 init_lineno (bfd *abfd, long offset, int size)
1354 linetab_offset = offset;
1355 linetab_size = size;
1362 if (bfd_seek (abfd, offset, 0) < 0)
1365 /* Allocate the desired table, plus a sentinel. */
1366 linetab = (char *) xmalloc (size + local_linesz);
1368 val = bfd_bread (linetab, size, abfd);
1372 /* Terminate it with an all-zero sentinel record. */
1373 memset (linetab + size, 0, local_linesz);
1387 free_linetab_cleanup (void *ignore)
1392 #if !defined (L_LNNO32)
1393 #define L_LNNO32(lp) ((lp)->l_lnno)
1397 enter_linenos (long file_offset, int first_line,
1398 int last_line, struct objfile *objfile)
1400 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1402 struct internal_lineno lptr;
1406 if (file_offset < linetab_offset)
1408 complaint (&symfile_complaints,
1409 _("Line number pointer %ld lower than start of line numbers"),
1411 if (file_offset > linetab_size) /* Too big to be an offset? */
1413 file_offset += linetab_offset; /* Try reading at that linetab
1417 rawptr = &linetab[file_offset - linetab_offset];
1419 /* Skip first line entry for each function. */
1420 rawptr += local_linesz;
1421 /* Line numbers start at one for the first line of the function. */
1424 /* If the line number table is full (e.g. 64K lines in COFF debug
1425 info), the next function's L_LNNO32 might not be zero, so don't
1426 overstep the table's end in any case. */
1427 while (rawptr <= &linetab[0] + linetab_size)
1429 bfd_coff_swap_lineno_in (symfile_bfd, rawptr, &lptr);
1430 rawptr += local_linesz;
1431 /* The next function, or the sentinel, will have L_LNNO32 zero;
1433 if (L_LNNO32 (&lptr) && L_LNNO32 (&lptr) <= last_line)
1435 CORE_ADDR addr = lptr.l_addr.l_paddr;
1436 addr += ANOFFSET (objfile->section_offsets,
1437 SECT_OFF_TEXT (objfile));
1438 record_line (current_subfile,
1439 first_line + L_LNNO32 (&lptr),
1440 gdbarch_addr_bits_remove (gdbarch, addr));
1448 patch_type (struct type *type, struct type *real_type)
1450 struct type *target = TYPE_TARGET_TYPE (type);
1451 struct type *real_target = TYPE_TARGET_TYPE (real_type);
1452 int field_size = TYPE_NFIELDS (real_target) * sizeof (struct field);
1454 TYPE_LENGTH (target) = TYPE_LENGTH (real_target);
1455 TYPE_NFIELDS (target) = TYPE_NFIELDS (real_target);
1456 TYPE_FIELDS (target) = (struct field *) TYPE_ALLOC (target,
1459 memcpy (TYPE_FIELDS (target),
1460 TYPE_FIELDS (real_target),
1463 if (TYPE_NAME (real_target))
1465 if (TYPE_NAME (target))
1466 xfree (TYPE_NAME (target));
1467 TYPE_NAME (target) = concat (TYPE_NAME (real_target),
1472 /* Patch up all appropriate typedef symbols in the opaque_type_chains
1473 so that they can be used to print out opaque data structures
1477 patch_opaque_types (struct symtab *s)
1480 struct dict_iterator iter;
1481 struct symbol *real_sym;
1483 /* Go through the per-file symbols only. */
1484 b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), STATIC_BLOCK);
1485 ALL_BLOCK_SYMBOLS (b, iter, real_sym)
1487 /* Find completed typedefs to use to fix opaque ones.
1488 Remove syms from the chain when their types are stored,
1489 but search the whole chain, as there may be several syms
1490 from different files with the same name. */
1491 if (SYMBOL_CLASS (real_sym) == LOC_TYPEDEF
1492 && SYMBOL_DOMAIN (real_sym) == VAR_DOMAIN
1493 && TYPE_CODE (SYMBOL_TYPE (real_sym)) == TYPE_CODE_PTR
1494 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym))) != 0)
1496 char *name = SYMBOL_LINKAGE_NAME (real_sym);
1497 int hash = hashname (name);
1498 struct symbol *sym, *prev;
1501 for (sym = opaque_type_chain[hash]; sym;)
1503 if (name[0] == SYMBOL_LINKAGE_NAME (sym)[0]
1504 && strcmp (name + 1, SYMBOL_LINKAGE_NAME (sym) + 1) == 0)
1508 SYMBOL_VALUE_CHAIN (prev) = SYMBOL_VALUE_CHAIN (sym);
1512 opaque_type_chain[hash] = SYMBOL_VALUE_CHAIN (sym);
1515 patch_type (SYMBOL_TYPE (sym), SYMBOL_TYPE (real_sym));
1519 sym = SYMBOL_VALUE_CHAIN (prev);
1523 sym = opaque_type_chain[hash];
1529 sym = SYMBOL_VALUE_CHAIN (sym);
1537 coff_reg_to_regnum (struct symbol *sym, struct gdbarch *gdbarch)
1539 return gdbarch_sdb_reg_to_regnum (gdbarch, SYMBOL_VALUE (sym));
1542 static const struct symbol_register_ops coff_register_funcs = {
1546 static struct symbol *
1547 process_coff_symbol (struct coff_symbol *cs,
1548 union internal_auxent *aux,
1549 struct objfile *objfile)
1552 = (struct symbol *) obstack_alloc (&objfile->objfile_obstack,
1553 sizeof (struct symbol));
1556 memset (sym, 0, sizeof (struct symbol));
1558 name = EXTERNAL_NAME (name, objfile->obfd);
1559 SYMBOL_SET_LANGUAGE (sym, current_subfile->language);
1560 SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
1562 /* default assumptions */
1563 SYMBOL_VALUE (sym) = cs->c_value;
1564 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1565 SYMBOL_SECTION (sym) = cs_to_section (cs, objfile);
1567 if (ISFCN (cs->c_type))
1569 SYMBOL_VALUE (sym) += ANOFFSET (objfile->section_offsets,
1570 SECT_OFF_TEXT (objfile));
1572 lookup_function_type (decode_function_type (cs, cs->c_type,
1575 SYMBOL_CLASS (sym) = LOC_BLOCK;
1576 if (cs->c_sclass == C_STAT || cs->c_sclass == C_THUMBSTAT
1577 || cs->c_sclass == C_THUMBSTATFUNC)
1578 add_symbol_to_list (sym, &file_symbols);
1579 else if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1580 || cs->c_sclass == C_THUMBEXTFUNC)
1581 add_symbol_to_list (sym, &global_symbols);
1585 SYMBOL_TYPE (sym) = decode_type (cs, cs->c_type, aux, objfile);
1586 switch (cs->c_sclass)
1592 SYMBOL_CLASS (sym) = LOC_LOCAL;
1593 add_symbol_to_list (sym, &local_symbols);
1597 case C_THUMBEXTFUNC:
1599 SYMBOL_CLASS (sym) = LOC_STATIC;
1600 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1601 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
1602 SECT_OFF_TEXT (objfile));
1603 add_symbol_to_list (sym, &global_symbols);
1607 case C_THUMBSTATFUNC:
1609 SYMBOL_CLASS (sym) = LOC_STATIC;
1610 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1611 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
1612 SECT_OFF_TEXT (objfile));
1613 if (within_function)
1615 /* Static symbol of local scope. */
1616 add_symbol_to_list (sym, &local_symbols);
1620 /* Static symbol at top level of file. */
1621 add_symbol_to_list (sym, &file_symbols);
1625 #ifdef C_GLBLREG /* AMD coff */
1629 SYMBOL_CLASS (sym) = LOC_REGISTER;
1630 SYMBOL_REGISTER_OPS (sym) = &coff_register_funcs;
1631 SYMBOL_VALUE (sym) = cs->c_value;
1632 add_symbol_to_list (sym, &local_symbols);
1640 SYMBOL_CLASS (sym) = LOC_ARG;
1641 SYMBOL_IS_ARGUMENT (sym) = 1;
1642 add_symbol_to_list (sym, &local_symbols);
1646 SYMBOL_CLASS (sym) = LOC_REGISTER;
1647 SYMBOL_REGISTER_OPS (sym) = &coff_register_funcs;
1648 SYMBOL_IS_ARGUMENT (sym) = 1;
1649 SYMBOL_VALUE (sym) = cs->c_value;
1650 add_symbol_to_list (sym, &local_symbols);
1654 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
1655 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1657 /* If type has no name, give it one. */
1658 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
1660 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1661 || TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_FUNC)
1663 /* If we are giving a name to a type such as
1664 "pointer to foo" or "function returning foo", we
1665 better not set the TYPE_NAME. If the program
1666 contains "typedef char *caddr_t;", we don't want
1667 all variables of type char * to print as caddr_t.
1668 This is not just a consequence of GDB's type
1669 management; CC and GCC (at least through version
1670 2.4) both output variables of either type char *
1671 or caddr_t with the type refering to the C_TPDEF
1672 symbol for caddr_t. If a future compiler cleans
1673 this up it GDB is not ready for it yet, but if it
1674 becomes ready we somehow need to disable this
1675 check (without breaking the PCC/GCC2.4 case).
1679 Fortunately, this check seems not to be necessary
1680 for anything except pointers or functions. */
1684 TYPE_NAME (SYMBOL_TYPE (sym)) =
1685 concat (SYMBOL_LINKAGE_NAME (sym), (char *) NULL);
1688 /* Keep track of any type which points to empty structured
1689 type, so it can be filled from a definition from another
1690 file. A simple forward reference (TYPE_CODE_UNDEF) is
1691 not an empty structured type, though; the forward
1692 references work themselves out via the magic of
1693 coff_lookup_type. */
1694 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1695 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym))) == 0
1696 && TYPE_CODE (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)))
1699 int i = hashname (SYMBOL_LINKAGE_NAME (sym));
1701 SYMBOL_VALUE_CHAIN (sym) = opaque_type_chain[i];
1702 opaque_type_chain[i] = sym;
1704 add_symbol_to_list (sym, &file_symbols);
1710 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
1711 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
1713 /* Some compilers try to be helpful by inventing "fake"
1714 names for anonymous enums, structures, and unions, like
1715 "~0fake" or ".0fake". Thanks, but no thanks... */
1716 if (TYPE_TAG_NAME (SYMBOL_TYPE (sym)) == 0)
1717 if (SYMBOL_LINKAGE_NAME (sym) != NULL
1718 && *SYMBOL_LINKAGE_NAME (sym) != '~'
1719 && *SYMBOL_LINKAGE_NAME (sym) != '.')
1720 TYPE_TAG_NAME (SYMBOL_TYPE (sym)) =
1721 concat (SYMBOL_LINKAGE_NAME (sym), (char *)NULL);
1723 add_symbol_to_list (sym, &file_symbols);
1733 /* Decode a coff type specifier; return the type that is meant. */
1735 static struct type *
1736 decode_type (struct coff_symbol *cs, unsigned int c_type,
1737 union internal_auxent *aux, struct objfile *objfile)
1739 struct type *type = 0;
1740 unsigned int new_c_type;
1742 if (c_type & ~N_BTMASK)
1744 new_c_type = DECREF (c_type);
1747 type = decode_type (cs, new_c_type, aux, objfile);
1748 type = lookup_pointer_type (type);
1750 else if (ISFCN (c_type))
1752 type = decode_type (cs, new_c_type, aux, objfile);
1753 type = lookup_function_type (type);
1755 else if (ISARY (c_type))
1758 unsigned short *dim;
1759 struct type *base_type, *index_type, *range_type;
1761 /* Define an array type. */
1762 /* auxent refers to array, not base type. */
1763 if (aux->x_sym.x_tagndx.l == 0)
1766 /* Shift the indices down. */
1767 dim = &aux->x_sym.x_fcnary.x_ary.x_dimen[0];
1770 for (i = 0; *dim && i < DIMNUM - 1; i++, dim++)
1774 base_type = decode_type (cs, new_c_type, aux, objfile);
1775 index_type = objfile_type (objfile)->builtin_int;
1777 create_range_type ((struct type *) NULL,
1778 index_type, 0, n - 1);
1780 create_array_type ((struct type *) NULL,
1781 base_type, range_type);
1786 /* Reference to existing type. This only occurs with the struct,
1787 union, and enum types. EPI a29k coff fakes us out by producing
1788 aux entries with a nonzero x_tagndx for definitions of structs,
1789 unions, and enums, so we have to check the c_sclass field. SCO
1790 3.2v4 cc gets confused with pointers to pointers to defined
1791 structs, and generates negative x_tagndx fields. */
1792 if (cs->c_naux > 0 && aux->x_sym.x_tagndx.l != 0)
1794 if (cs->c_sclass != C_STRTAG
1795 && cs->c_sclass != C_UNTAG
1796 && cs->c_sclass != C_ENTAG
1797 && aux->x_sym.x_tagndx.l >= 0)
1799 type = coff_alloc_type (aux->x_sym.x_tagndx.l);
1804 complaint (&symfile_complaints,
1805 _("Symbol table entry for %s has bad tagndx value"),
1807 /* And fall through to decode_base_type... */
1811 return decode_base_type (cs, BTYPE (c_type), aux, objfile);
1814 /* Decode a coff type specifier for function definition;
1815 return the type that the function returns. */
1817 static struct type *
1818 decode_function_type (struct coff_symbol *cs,
1819 unsigned int c_type,
1820 union internal_auxent *aux,
1821 struct objfile *objfile)
1823 if (aux->x_sym.x_tagndx.l == 0)
1824 cs->c_naux = 0; /* auxent refers to function, not base
1827 return decode_type (cs, DECREF (c_type), aux, objfile);
1830 /* Basic C types. */
1832 static struct type *
1833 decode_base_type (struct coff_symbol *cs,
1834 unsigned int c_type,
1835 union internal_auxent *aux,
1836 struct objfile *objfile)
1838 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1844 /* Shows up with "void (*foo)();" structure members. */
1845 return objfile_type (objfile)->builtin_void;
1849 /* Intel 960 COFF has this symbol and meaning. */
1850 return objfile_type (objfile)->builtin_void;
1854 return objfile_type (objfile)->builtin_char;
1857 return objfile_type (objfile)->builtin_short;
1860 return objfile_type (objfile)->builtin_int;
1863 if (cs->c_sclass == C_FIELD
1864 && aux->x_sym.x_misc.x_lnsz.x_size
1865 > gdbarch_long_bit (gdbarch))
1866 return objfile_type (objfile)->builtin_long_long;
1868 return objfile_type (objfile)->builtin_long;
1871 return objfile_type (objfile)->builtin_float;
1874 return objfile_type (objfile)->builtin_double;
1877 return objfile_type (objfile)->builtin_long_double;
1880 if (cs->c_naux != 1)
1882 /* Anonymous structure type. */
1883 type = coff_alloc_type (cs->c_symnum);
1884 TYPE_CODE (type) = TYPE_CODE_STRUCT;
1885 TYPE_NAME (type) = NULL;
1886 /* This used to set the tag to "<opaque>". But I think
1887 setting it to NULL is right, and the printing code can
1888 print it as "struct {...}". */
1889 TYPE_TAG_NAME (type) = NULL;
1890 INIT_CPLUS_SPECIFIC (type);
1891 TYPE_LENGTH (type) = 0;
1892 TYPE_FIELDS (type) = 0;
1893 TYPE_NFIELDS (type) = 0;
1897 type = coff_read_struct_type (cs->c_symnum,
1898 aux->x_sym.x_misc.x_lnsz.x_size,
1899 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1905 if (cs->c_naux != 1)
1907 /* Anonymous union type. */
1908 type = coff_alloc_type (cs->c_symnum);
1909 TYPE_NAME (type) = NULL;
1910 /* This used to set the tag to "<opaque>". But I think
1911 setting it to NULL is right, and the printing code can
1912 print it as "union {...}". */
1913 TYPE_TAG_NAME (type) = NULL;
1914 INIT_CPLUS_SPECIFIC (type);
1915 TYPE_LENGTH (type) = 0;
1916 TYPE_FIELDS (type) = 0;
1917 TYPE_NFIELDS (type) = 0;
1921 type = coff_read_struct_type (cs->c_symnum,
1922 aux->x_sym.x_misc.x_lnsz.x_size,
1923 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1926 TYPE_CODE (type) = TYPE_CODE_UNION;
1930 if (cs->c_naux != 1)
1932 /* Anonymous enum type. */
1933 type = coff_alloc_type (cs->c_symnum);
1934 TYPE_CODE (type) = TYPE_CODE_ENUM;
1935 TYPE_NAME (type) = NULL;
1936 /* This used to set the tag to "<opaque>". But I think
1937 setting it to NULL is right, and the printing code can
1938 print it as "enum {...}". */
1939 TYPE_TAG_NAME (type) = NULL;
1940 TYPE_LENGTH (type) = 0;
1941 TYPE_FIELDS (type) = 0;
1942 TYPE_NFIELDS (type) = 0;
1946 type = coff_read_enum_type (cs->c_symnum,
1947 aux->x_sym.x_misc.x_lnsz.x_size,
1948 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1954 /* Shouldn't show up here. */
1958 return objfile_type (objfile)->builtin_unsigned_char;
1961 return objfile_type (objfile)->builtin_unsigned_short;
1964 return objfile_type (objfile)->builtin_unsigned_int;
1967 if (cs->c_sclass == C_FIELD
1968 && aux->x_sym.x_misc.x_lnsz.x_size
1969 > gdbarch_long_bit (gdbarch))
1970 return objfile_type (objfile)->builtin_unsigned_long_long;
1972 return objfile_type (objfile)->builtin_unsigned_long;
1974 complaint (&symfile_complaints,
1975 _("Unexpected type for symbol %s"), cs->c_name);
1976 return objfile_type (objfile)->builtin_void;
1979 /* This page contains subroutines of read_type. */
1981 /* Read the description of a structure (or union type) and return an
1982 object describing the type. */
1984 static struct type *
1985 coff_read_struct_type (int index, int length, int lastsym,
1986 struct objfile *objfile)
1990 struct nextfield *next;
1995 struct nextfield *list = 0;
1996 struct nextfield *new;
2000 struct coff_symbol member_sym;
2001 struct coff_symbol *ms = &member_sym;
2002 struct internal_syment sub_sym;
2003 union internal_auxent sub_aux;
2006 type = coff_alloc_type (index);
2007 TYPE_CODE (type) = TYPE_CODE_STRUCT;
2008 INIT_CPLUS_SPECIFIC (type);
2009 TYPE_LENGTH (type) = length;
2011 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2013 read_one_sym (ms, &sub_sym, &sub_aux);
2015 name = EXTERNAL_NAME (name, objfile->obfd);
2017 switch (ms->c_sclass)
2022 /* Get space to record the next field's data. */
2023 new = (struct nextfield *) alloca (sizeof (struct nextfield));
2027 /* Save the data. */
2028 list->field.name = obsavestring (name, strlen (name),
2029 &objfile->objfile_obstack);
2030 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type,
2032 SET_FIELD_BITPOS (list->field, 8 * ms->c_value);
2033 FIELD_BITSIZE (list->field) = 0;
2039 /* Get space to record the next field's data. */
2040 new = (struct nextfield *) alloca (sizeof (struct nextfield));
2044 /* Save the data. */
2045 list->field.name = obsavestring (name, strlen (name),
2046 &objfile->objfile_obstack);
2047 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type,
2049 SET_FIELD_BITPOS (list->field, ms->c_value);
2050 FIELD_BITSIZE (list->field) = sub_aux.x_sym.x_misc.x_lnsz.x_size;
2059 /* Now create the vector of fields, and record how big it is. */
2061 TYPE_NFIELDS (type) = nfields;
2062 TYPE_FIELDS (type) = (struct field *)
2063 TYPE_ALLOC (type, sizeof (struct field) * nfields);
2065 /* Copy the saved-up fields into the field vector. */
2067 for (n = nfields; list; list = list->next)
2068 TYPE_FIELD (type, --n) = list->field;
2073 /* Read a definition of an enumeration type,
2074 and create and return a suitable type object.
2075 Also defines the symbols that represent the values of the type. */
2077 static struct type *
2078 coff_read_enum_type (int index, int length, int lastsym,
2079 struct objfile *objfile)
2081 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2086 struct pending **symlist;
2087 struct coff_symbol member_sym;
2088 struct coff_symbol *ms = &member_sym;
2089 struct internal_syment sub_sym;
2090 union internal_auxent sub_aux;
2091 struct pending *osyms, *syms;
2095 int unsigned_enum = 1;
2097 type = coff_alloc_type (index);
2098 if (within_function)
2099 symlist = &local_symbols;
2101 symlist = &file_symbols;
2103 o_nsyms = osyms ? osyms->nsyms : 0;
2105 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2107 read_one_sym (ms, &sub_sym, &sub_aux);
2109 name = EXTERNAL_NAME (name, objfile->obfd);
2111 switch (ms->c_sclass)
2114 sym = (struct symbol *) obstack_alloc
2115 (&objfile->objfile_obstack, sizeof (struct symbol));
2116 memset (sym, 0, sizeof (struct symbol));
2118 SYMBOL_SET_LINKAGE_NAME (sym,
2119 obsavestring (name, strlen (name),
2120 &objfile->objfile_obstack));
2121 SYMBOL_CLASS (sym) = LOC_CONST;
2122 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2123 SYMBOL_VALUE (sym) = ms->c_value;
2124 add_symbol_to_list (sym, symlist);
2129 /* Sometimes the linker (on 386/ix 2.0.2 at least) screws
2130 up the count of how many symbols to read. So stop
2137 /* Now fill in the fields of the type-structure. */
2140 TYPE_LENGTH (type) = length;
2141 else /* Assume ints. */
2142 TYPE_LENGTH (type) = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
2143 TYPE_CODE (type) = TYPE_CODE_ENUM;
2144 TYPE_NFIELDS (type) = nsyms;
2145 TYPE_FIELDS (type) = (struct field *)
2146 TYPE_ALLOC (type, sizeof (struct field) * nsyms);
2148 /* Find the symbols for the values and put them into the type.
2149 The symbols can be found in the symlist that we put them on
2150 to cause them to be defined. osyms contains the old value
2151 of that symlist; everything up to there was defined by us. */
2152 /* Note that we preserve the order of the enum constants, so
2153 that in something like "enum {FOO, LAST_THING=FOO}" we print
2154 FOO, not LAST_THING. */
2156 for (syms = *symlist, n = 0; syms; syms = syms->next)
2162 for (; j < syms->nsyms; j++, n++)
2164 struct symbol *xsym = syms->symbol[j];
2166 SYMBOL_TYPE (xsym) = type;
2167 TYPE_FIELD_NAME (type, n) = SYMBOL_LINKAGE_NAME (xsym);
2168 SET_FIELD_BITPOS (TYPE_FIELD (type, n), SYMBOL_VALUE (xsym));
2169 if (SYMBOL_VALUE (xsym) < 0)
2171 TYPE_FIELD_BITSIZE (type, n) = 0;
2178 TYPE_UNSIGNED (type) = 1;
2183 /* Register our ability to parse symbols for coff BFD files. */
2185 static const struct sym_fns coff_sym_fns =
2187 bfd_target_coff_flavour,
2188 coff_new_init, /* sym_new_init: init anything gbl to
2190 coff_symfile_init, /* sym_init: read initial info, setup
2192 coff_symfile_read, /* sym_read: read a symbol file into
2194 NULL, /* sym_read_psymbols */
2195 coff_symfile_finish, /* sym_finish: finished with file,
2197 default_symfile_offsets, /* sym_offsets: xlate external to
2199 default_symfile_segments, /* sym_segments: Get segment
2200 information from a file */
2201 NULL, /* sym_read_linetable */
2203 default_symfile_relocate, /* sym_relocate: Relocate a debug
2209 _initialize_coffread (void)
2211 add_symtab_fns (&coff_sym_fns);