1 /* Read coff symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1987-2018 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"
30 #include "coff/internal.h" /* Internal format of COFF symbols in BFD */
31 #include "libcoff.h" /* FIXME secret internal data from BFD */
34 #include "gdb-stabs.h"
35 #include "stabsread.h"
36 #include "complaints.h"
39 #include "dictionary.h"
41 #include "coff-pe-read.h"
46 /* Key for COFF-associated data. */
48 static const struct objfile_data *coff_objfile_data_key;
50 /* The objfile we are currently reading. */
52 static struct objfile *coffread_objfile;
54 struct coff_symfile_info
56 file_ptr min_lineno_offset; /* Where in file lowest line#s are. */
57 file_ptr max_lineno_offset; /* 1+last byte of line#s in file. */
59 CORE_ADDR textaddr; /* Addr of .text section. */
60 unsigned int textsize; /* Size of .text section. */
61 struct stab_section_list *stabsects; /* .stab sections. */
62 asection *stabstrsect; /* Section pointer for .stab section. */
66 /* Translate an external name string into a user-visible name. */
67 #define EXTERNAL_NAME(string, abfd) \
68 (string[0] == bfd_get_symbol_leading_char (abfd) \
69 ? string + 1 : string)
71 /* To be an sdb debug type, type must have at least a basic or primary
72 derived type. Using this rather than checking against T_NULL is
73 said to prevent core dumps if we try to operate on Michael Bloom
76 #define SDB_TYPE(type) (BTYPE(type) | (type & N_TMASK))
78 /* Core address of start and end of text of current source file.
79 This comes from a ".text" symbol where x_nlinno > 0. */
81 static CORE_ADDR current_source_start_addr;
82 static CORE_ADDR current_source_end_addr;
84 /* The addresses of the symbol table stream and number of symbols
85 of the object file we are reading (as copied into core). */
87 static bfd *nlist_bfd_global;
88 static int nlist_nsyms_global;
91 /* Pointers to scratch storage, used for reading raw symbols and
94 static char *temp_sym;
95 static char *temp_aux;
97 /* Local variables that hold the shift and mask values for the
98 COFF file that we are currently reading. These come back to us
99 from BFD, and are referenced by their macro names, as well as
100 internally to the BTYPE, ISPTR, ISFCN, ISARY, ISTAG, and DECREF
101 macros from include/coff/internal.h . */
103 static unsigned local_n_btmask;
104 static unsigned local_n_btshft;
105 static unsigned local_n_tmask;
106 static unsigned local_n_tshift;
108 #define N_BTMASK local_n_btmask
109 #define N_BTSHFT local_n_btshft
110 #define N_TMASK local_n_tmask
111 #define N_TSHIFT local_n_tshift
113 /* Local variables that hold the sizes in the file of various COFF
114 structures. (We only need to know this to read them from the file
115 -- BFD will then translate the data in them, into `internal_xxx'
116 structs in the right byte order, alignment, etc.) */
118 static unsigned local_linesz;
119 static unsigned local_symesz;
120 static unsigned local_auxesz;
122 /* This is set if this is a PE format file. */
126 /* Chain of typedefs of pointers to empty struct/union types.
127 They are chained thru the SYMBOL_VALUE_CHAIN. */
129 static struct symbol *opaque_type_chain[HASHSIZE];
131 /* Simplified internal version of coff symbol table information. */
136 int c_symnum; /* Symbol number of this entry. */
137 int c_naux; /* 0 if syment only, 1 if syment +
145 /* Vector of types defined so far, indexed by their type numbers. */
147 static struct type **type_vector;
149 /* Number of elements allocated for type_vector currently. */
151 static int type_vector_length;
153 /* Initial size of type vector. Is realloc'd larger if needed, and
154 realloc'd down to the size actually used, when completed. */
156 #define INITIAL_TYPE_VECTOR_LENGTH 160
158 extern void stabsread_clear_cache (void);
160 static struct type *coff_read_struct_type (int, int, int,
163 static struct type *decode_base_type (struct coff_symbol *,
165 union internal_auxent *,
168 static struct type *decode_type (struct coff_symbol *, unsigned int,
169 union internal_auxent *,
172 static struct type *decode_function_type (struct coff_symbol *,
174 union internal_auxent *,
177 static struct type *coff_read_enum_type (int, int, int,
180 static struct symbol *process_coff_symbol (struct coff_symbol *,
181 union internal_auxent *,
184 static void patch_opaque_types (struct symtab *);
186 static void enter_linenos (long, int, int, struct objfile *);
188 static void free_linetab (void);
190 static void free_linetab_cleanup (void *ignore);
192 static int init_lineno (bfd *, long, int);
194 static char *getsymname (struct internal_syment *);
196 static const char *coff_getfilename (union internal_auxent *);
198 static void free_stringtab (void);
200 static void free_stringtab_cleanup (void *ignore);
202 static int init_stringtab (bfd *, long);
204 static void read_one_sym (struct coff_symbol *,
205 struct internal_syment *,
206 union internal_auxent *);
208 static void coff_symtab_read (minimal_symbol_reader &,
209 long, unsigned int, struct objfile *);
211 /* We are called once per section from coff_symfile_read. We
212 need to examine each section we are passed, check to see
213 if it is something we are interested in processing, and
214 if so, stash away some access information for the section.
216 FIXME: The section names should not be hardwired strings (what
217 should they be? I don't think most object file formats have enough
218 section flags to specify what kind of debug section it is
222 coff_locate_sections (bfd *abfd, asection *sectp, void *csip)
224 struct coff_symfile_info *csi;
227 csi = (struct coff_symfile_info *) csip;
228 name = bfd_get_section_name (abfd, sectp);
229 if (strcmp (name, ".text") == 0)
231 csi->textaddr = bfd_section_vma (abfd, sectp);
232 csi->textsize += bfd_section_size (abfd, sectp);
234 else if (startswith (name, ".text"))
236 csi->textsize += bfd_section_size (abfd, sectp);
238 else if (strcmp (name, ".stabstr") == 0)
240 csi->stabstrsect = sectp;
242 else if (startswith (name, ".stab"))
246 /* We can have multiple .stab sections if linked with
248 for (s = name + sizeof ".stab" - 1; *s != '\0'; s++)
253 struct stab_section_list *n, **pn;
255 n = XNEW (struct stab_section_list);
258 for (pn = &csi->stabsects; *pn != NULL; pn = &(*pn)->next)
262 /* This will be run after coffstab_build_psymtabs is called
263 in coff_symfile_read, at which point we no longer need
265 make_cleanup (xfree, n);
270 /* Return the section_offsets* that CS points to. */
271 static int cs_to_section (struct coff_symbol *, struct objfile *);
273 struct find_targ_sec_arg
280 find_targ_sec (bfd *abfd, asection *sect, void *obj)
282 struct find_targ_sec_arg *args = (struct find_targ_sec_arg *) obj;
284 if (sect->target_index == args->targ_index)
285 *args->resultp = sect;
288 /* Return the bfd_section that CS points to. */
289 static struct bfd_section*
290 cs_to_bfd_section (struct coff_symbol *cs, struct objfile *objfile)
292 asection *sect = NULL;
293 struct find_targ_sec_arg args;
295 args.targ_index = cs->c_secnum;
296 args.resultp = §
297 bfd_map_over_sections (objfile->obfd, find_targ_sec, &args);
301 /* Return the section number (SECT_OFF_*) that CS points to. */
303 cs_to_section (struct coff_symbol *cs, struct objfile *objfile)
305 asection *sect = cs_to_bfd_section (cs, objfile);
308 return SECT_OFF_TEXT (objfile);
309 return gdb_bfd_section_index (objfile->obfd, sect);
312 /* Return the address of the section of a COFF symbol. */
314 static CORE_ADDR cs_section_address (struct coff_symbol *, bfd *);
317 cs_section_address (struct coff_symbol *cs, bfd *abfd)
319 asection *sect = NULL;
320 struct find_targ_sec_arg args;
323 args.targ_index = cs->c_secnum;
324 args.resultp = §
325 bfd_map_over_sections (abfd, find_targ_sec, &args);
327 addr = bfd_get_section_vma (abfd, sect);
331 /* Look up a coff type-number index. Return the address of the slot
332 where the type for that index is stored.
333 The type-number is in INDEX.
335 This can be used for finding the type associated with that index
336 or for associating a new type with the index. */
338 static struct type **
339 coff_lookup_type (int index)
341 if (index >= type_vector_length)
343 int old_vector_length = type_vector_length;
345 type_vector_length *= 2;
346 if (index /* is still */ >= type_vector_length)
347 type_vector_length = index * 2;
349 type_vector = (struct type **)
350 xrealloc ((char *) type_vector,
351 type_vector_length * sizeof (struct type *));
352 memset (&type_vector[old_vector_length], 0,
353 (type_vector_length - old_vector_length) * sizeof (struct type *));
355 return &type_vector[index];
358 /* Make sure there is a type allocated for type number index
359 and return the type object.
360 This can create an empty (zeroed) type object. */
363 coff_alloc_type (int index)
365 struct type **type_addr = coff_lookup_type (index);
366 struct type *type = *type_addr;
368 /* If we are referring to a type not known at all yet,
369 allocate an empty type for it.
370 We will fill it in later if we find out how. */
373 type = alloc_type (coffread_objfile);
379 /* Start a new symtab for a new source file.
380 This is called when a COFF ".file" symbol is seen;
381 it indicates the start of data for one original source file. */
384 coff_start_symtab (struct objfile *objfile, const char *name)
387 start_symtab (objfile,
388 /* We fill in the filename later. start_symtab puts this pointer
389 into last_source_file and we put it in subfiles->name, which
390 end_symtab frees; that's why it must be malloc'd. */
392 /* We never know the directory name for COFF. */
394 /* The start address is irrelevant, since we call
395 set_last_source_start_addr in coff_end_symtab. */
397 /* Let buildsym.c deduce the language for this symtab. */
399 record_debugformat ("COFF");
402 /* Save the vital information from when starting to read a file,
403 for use when closing off the current file.
404 NAME is the file name the symbols came from, START_ADDR is the
405 first text address for the file, and SIZE is the number of bytes of
409 complete_symtab (const char *name, CORE_ADDR start_addr, unsigned int size)
411 set_last_source_file (name);
412 current_source_start_addr = start_addr;
413 current_source_end_addr = start_addr + size;
416 /* Finish the symbol definitions for one main source file, close off
417 all the lexical contexts for that file (creating struct block's for
418 them), then make the struct symtab for that file and put it in the
422 coff_end_symtab (struct objfile *objfile)
424 set_last_source_start_addr (current_source_start_addr);
426 end_symtab (current_source_end_addr, SECT_OFF_TEXT (objfile));
428 /* Reinitialize for beginning of new file. */
429 set_last_source_file (NULL);
432 /* The linker sometimes generates some non-function symbols inside
433 functions referencing variables imported from another DLL.
434 Return nonzero if the given symbol corresponds to one of them. */
437 is_import_fixup_symbol (struct coff_symbol *cs,
438 enum minimal_symbol_type type)
440 /* The following is a bit of a heuristic using the characterictics
441 of these fixup symbols, but should work well in practice... */
444 /* Must be a non-static text symbol. */
445 if (type != mst_text)
448 /* Must be a non-function symbol. */
449 if (ISFCN (cs->c_type))
452 /* The name must start with "__fu<digits>__". */
453 if (!startswith (cs->c_name, "__fu"))
455 if (! isdigit (cs->c_name[4]))
457 for (i = 5; cs->c_name[i] != '\0' && isdigit (cs->c_name[i]); i++)
458 /* Nothing, just incrementing index past all digits. */;
459 if (cs->c_name[i] != '_' || cs->c_name[i + 1] != '_')
465 static struct minimal_symbol *
466 record_minimal_symbol (minimal_symbol_reader &reader,
467 struct coff_symbol *cs, CORE_ADDR address,
468 enum minimal_symbol_type type, int section,
469 struct objfile *objfile)
471 /* We don't want TDESC entry points in the minimal symbol table. */
472 if (cs->c_name[0] == '@')
475 if (is_import_fixup_symbol (cs, type))
477 /* Because the value of these symbols is within a function code
478 range, these symbols interfere with the symbol-from-address
479 reverse lookup; this manifests itselfs in backtraces, or any
480 other commands that prints symbolic addresses. Just pretend
481 these symbols do not exist. */
485 return reader.record_with_info (cs->c_name, address, type, section);
488 /* coff_symfile_init ()
489 is the coff-specific initialization routine for reading symbols.
490 It is passed a struct objfile which contains, among other things,
491 the BFD for the file whose symbols are being read, and a slot for
492 a pointer to "private data" which we fill with cookies and other
493 treats for coff_symfile_read ().
495 We will only be called if this is a COFF or COFF-like file. BFD
496 handles figuring out the format of the file, and code in symtab.c
497 uses BFD's determination to vector to us.
499 The ultimate result is a new symtab (or, FIXME, eventually a
503 coff_symfile_init (struct objfile *objfile)
505 struct dbx_symfile_info *dbx;
506 struct coff_symfile_info *coff;
508 /* Allocate struct to keep track of stab reading. */
509 dbx = XCNEW (struct dbx_symfile_info);
510 set_objfile_data (objfile, dbx_objfile_data_key, dbx);
512 /* Allocate struct to keep track of the symfile. */
513 coff = XCNEW (struct coff_symfile_info);
514 set_objfile_data (objfile, coff_objfile_data_key, coff);
516 /* COFF objects may be reordered, so set OBJF_REORDERED. If we
517 find this causes a significant slowdown in gdb then we could
518 set it in the debug symbol readers only when necessary. */
519 objfile->flags |= OBJF_REORDERED;
522 /* This function is called for every section; it finds the outer
523 limits of the line table (minimum and maximum file offset) so that
524 the mainline code can read the whole thing for efficiency. */
527 find_linenos (bfd *abfd, struct bfd_section *asect, void *vpinfo)
529 struct coff_symfile_info *info;
531 file_ptr offset, maxoff;
533 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
534 count = asect->lineno_count;
535 /* End of warning. */
539 size = count * local_linesz;
541 info = (struct coff_symfile_info *) vpinfo;
542 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
543 offset = asect->line_filepos;
544 /* End of warning. */
546 if (offset < info->min_lineno_offset || info->min_lineno_offset == 0)
547 info->min_lineno_offset = offset;
549 maxoff = offset + size;
550 if (maxoff > info->max_lineno_offset)
551 info->max_lineno_offset = maxoff;
555 /* The BFD for this file -- only good while we're actively reading
556 symbols into a psymtab or a symtab. */
558 static bfd *symfile_bfd;
560 /* Read a symbol file, after initialization by coff_symfile_init. */
563 coff_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
565 struct coff_symfile_info *info;
566 bfd *abfd = objfile->obfd;
567 coff_data_type *cdata = coff_data (abfd);
568 char *name = bfd_get_filename (abfd);
570 unsigned int num_symbols;
572 int stringtab_offset;
573 struct cleanup *back_to;
576 info = (struct coff_symfile_info *) objfile_data (objfile,
577 coff_objfile_data_key);
578 symfile_bfd = abfd; /* Kludge for swap routines. */
580 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
581 num_symbols = bfd_get_symcount (abfd); /* How many syms */
582 symtab_offset = cdata->sym_filepos; /* Symbol table file offset */
583 stringtab_offset = symtab_offset + /* String table file offset */
584 num_symbols * cdata->local_symesz;
586 /* Set a few file-statics that give us specific information about
587 the particular COFF file format we're reading. */
588 local_n_btmask = cdata->local_n_btmask;
589 local_n_btshft = cdata->local_n_btshft;
590 local_n_tmask = cdata->local_n_tmask;
591 local_n_tshift = cdata->local_n_tshift;
592 local_linesz = cdata->local_linesz;
593 local_symesz = cdata->local_symesz;
594 local_auxesz = cdata->local_auxesz;
596 /* Allocate space for raw symbol and aux entries, based on their
597 space requirements as reported by BFD. */
598 temp_sym = (char *) xmalloc
599 (cdata->local_symesz + cdata->local_auxesz);
600 temp_aux = temp_sym + cdata->local_symesz;
601 back_to = make_cleanup (free_current_contents, &temp_sym);
603 /* We need to know whether this is a PE file, because in PE files,
604 unlike standard COFF files, symbol values are stored as offsets
605 from the section address, rather than as absolute addresses.
606 FIXME: We should use BFD to read the symbol table, and thus avoid
609 startswith (bfd_get_target (objfile->obfd), "pe")
610 || startswith (bfd_get_target (objfile->obfd), "epoc-pe");
612 /* End of warning. */
614 info->min_lineno_offset = 0;
615 info->max_lineno_offset = 0;
617 /* Only read line number information if we have symbols.
619 On Windows NT, some of the system's DLL's have sections with
620 PointerToLinenumbers fields that are non-zero, but point at
621 random places within the image file. (In the case I found,
622 KERNEL32.DLL's .text section has a line number info pointer that
623 points into the middle of the string `lib\\i386\kernel32.dll'.)
625 However, these DLL's also have no symbols. The line number
626 tables are meaningless without symbols. And in fact, GDB never
627 uses the line number information unless there are symbols. So we
628 can avoid spurious error messages (and maybe run a little
629 faster!) by not even reading the line number table unless we have
633 /* Read the line number table, all at once. */
634 bfd_map_over_sections (abfd, find_linenos, (void *) info);
636 make_cleanup (free_linetab_cleanup, 0 /*ignore*/);
637 val = init_lineno (abfd, info->min_lineno_offset,
638 info->max_lineno_offset - info->min_lineno_offset);
640 error (_("\"%s\": error reading line numbers."), name);
643 /* Now read the string table, all at once. */
645 make_cleanup (free_stringtab_cleanup, 0 /*ignore*/);
646 val = init_stringtab (abfd, stringtab_offset);
648 error (_("\"%s\": can't get string table"), name);
650 minimal_symbol_reader reader (objfile);
652 /* Now that the executable file is positioned at symbol table,
653 process it and define symbols accordingly. */
655 coff_symtab_read (reader, (long) symtab_offset, num_symbols, objfile);
657 /* Install any minimal symbols that have been collected as the
658 current minimal symbols for this objfile. */
664 struct minimal_symbol *msym;
666 ALL_OBJFILE_MSYMBOLS (objfile, msym)
668 const char *name = MSYMBOL_LINKAGE_NAME (msym);
670 /* If the minimal symbols whose name are prefixed by "__imp_"
671 or "_imp_", get rid of the prefix, and search the minimal
672 symbol in OBJFILE. Note that 'maintenance print msymbols'
673 shows that type of these "_imp_XXXX" symbols is mst_data. */
674 if (MSYMBOL_TYPE (msym) == mst_data)
676 const char *name1 = NULL;
678 if (startswith (name, "_imp_"))
680 else if (startswith (name, "__imp_"))
684 int lead = bfd_get_symbol_leading_char (objfile->obfd);
685 struct bound_minimal_symbol found;
687 if (lead != '\0' && *name1 == lead)
690 found = lookup_minimal_symbol (name1, NULL, objfile);
692 /* If found, there are symbols named "_imp_foo" and "foo"
693 respectively in OBJFILE. Set the type of symbol "foo"
694 as 'mst_solib_trampoline'. */
695 if (found.minsym != NULL
696 && MSYMBOL_TYPE (found.minsym) == mst_text)
697 MSYMBOL_TYPE (found.minsym) = mst_solib_trampoline;
703 if (!(objfile->flags & OBJF_READNEVER))
704 bfd_map_over_sections (abfd, coff_locate_sections, (void *) info);
708 if (!info->stabstrsect)
710 error (_("The debugging information in `%s' is corrupted.\nThe "
711 "file has a `.stabs' section, but no `.stabstr' section."),
715 /* FIXME: dubious. Why can't we use something normal like
716 bfd_get_section_contents? */
717 bfd_seek (abfd, abfd->where, 0);
719 stabstrsize = bfd_section_size (abfd, info->stabstrsect);
721 coffstab_build_psymtabs (objfile,
722 info->textaddr, info->textsize,
724 info->stabstrsect->filepos, stabstrsize);
726 if (dwarf2_has_info (objfile, NULL))
728 /* DWARF2 sections. */
729 dwarf2_build_psymtabs (objfile);
732 dwarf2_build_frame_info (objfile);
734 /* Try to add separate debug file if no symbols table found. */
735 if (!objfile_has_partial_symbols (objfile))
737 std::string debugfile = find_separate_debug_file_by_buildid (objfile);
739 if (debugfile.empty ())
740 debugfile = find_separate_debug_file_by_debuglink (objfile);
742 if (!debugfile.empty ())
744 gdb_bfd_ref_ptr abfd (symfile_bfd_open (debugfile.c_str ()));
746 symbol_file_add_separate (abfd.get (), debugfile.c_str (),
747 symfile_flags, objfile);
751 do_cleanups (back_to);
755 coff_new_init (struct objfile *ignore)
759 /* Perform any local cleanups required when we are done with a
760 particular objfile. I.E, we are in the process of discarding all
761 symbol information for an objfile, freeing up all memory held for
762 it, and unlinking the objfile struct from the global list of known
766 coff_symfile_finish (struct objfile *objfile)
768 /* Let stabs reader clean up. */
769 stabsread_clear_cache ();
773 /* Given pointers to a symbol table in coff style exec file,
774 analyze them and create struct symtab's describing the symbols.
775 NSYMS is the number of symbols in the symbol table.
776 We read them one at a time using read_one_sym (). */
779 coff_symtab_read (minimal_symbol_reader &reader,
780 long symtab_offset, unsigned int nsyms,
781 struct objfile *objfile)
783 struct gdbarch *gdbarch = get_objfile_arch (objfile);
784 struct context_stack *newobj;
785 struct coff_symbol coff_symbol;
786 struct coff_symbol *cs = &coff_symbol;
787 static struct internal_syment main_sym;
788 static union internal_auxent main_aux;
789 struct coff_symbol fcn_cs_saved;
790 static struct internal_syment fcn_sym_saved;
791 static union internal_auxent fcn_aux_saved;
792 /* A .file is open. */
793 int in_source_file = 0;
794 int next_file_symnum = -1;
795 /* Name of the current file. */
796 const char *filestring = "";
798 int fcn_first_line = 0;
799 CORE_ADDR fcn_first_line_addr = 0;
800 int fcn_last_line = 0;
801 int fcn_start_addr = 0;
802 long fcn_line_ptr = 0;
805 struct minimal_symbol *msym;
807 /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous....
808 it's hard to know I've really worked around it. The fix should
809 be harmless, anyway). The symptom of the bug is that the first
810 fread (in read_one_sym), will (in my example) actually get data
811 from file offset 268, when the fseek was to 264 (and ftell shows
812 264). This causes all hell to break loose. I was unable to
813 reproduce this on a short test program which operated on the same
814 file, performing (I think) the same sequence of operations.
816 It stopped happening when I put in this (former) rewind().
818 FIXME: Find out if this has been reported to Sun, whether it has
819 been fixed in a later release, etc. */
821 bfd_seek (objfile->obfd, 0, 0);
823 /* Position to read the symbol table. */
824 val = bfd_seek (objfile->obfd, (long) symtab_offset, 0);
826 perror_with_name (objfile_name (objfile));
828 coffread_objfile = objfile;
829 nlist_bfd_global = objfile->obfd;
830 nlist_nsyms_global = nsyms;
831 set_last_source_file (NULL);
832 memset (opaque_type_chain, 0, sizeof opaque_type_chain);
834 if (type_vector) /* Get rid of previous one. */
836 type_vector_length = INITIAL_TYPE_VECTOR_LENGTH;
837 type_vector = XCNEWVEC (struct type *, type_vector_length);
839 coff_start_symtab (objfile, "");
842 while (symnum < nsyms)
844 QUIT; /* Make this command interruptable. */
846 read_one_sym (cs, &main_sym, &main_aux);
848 if (cs->c_symnum == next_file_symnum && cs->c_sclass != C_FILE)
850 if (get_last_source_file ())
851 coff_end_symtab (objfile);
853 coff_start_symtab (objfile, "_globals_");
854 /* coff_start_symtab will set the language of this symtab to
855 language_unknown, since such a ``file name'' is not
856 recognized. Override that with the minimal language to
857 allow printing values in this symtab. */
858 current_subfile->language = language_minimal;
859 complete_symtab ("_globals_", 0, 0);
860 /* Done with all files, everything from here on out is
864 /* Special case for file with type declarations only, no
866 if (!get_last_source_file () && SDB_TYPE (cs->c_type)
867 && cs->c_secnum == N_DEBUG)
868 complete_symtab (filestring, 0, 0);
870 /* Typedefs should not be treated as symbol definitions. */
871 if (ISFCN (cs->c_type) && cs->c_sclass != C_TPDEF)
873 /* Record all functions -- external and static -- in
875 int section = cs_to_section (cs, objfile);
877 tmpaddr = cs->c_value;
878 record_minimal_symbol (reader, cs, tmpaddr, mst_text,
881 fcn_line_ptr = main_aux.x_sym.x_fcnary.x_fcn.x_lnnoptr;
882 fcn_start_addr = tmpaddr;
884 fcn_sym_saved = main_sym;
885 fcn_aux_saved = main_aux;
889 switch (cs->c_sclass)
898 complaint (_("Bad n_sclass for symbol %s"),
903 /* c_value field contains symnum of next .file entry in
904 table or symnum of first global after last .file. */
905 next_file_symnum = cs->c_value;
907 filestring = coff_getfilename (&main_aux);
911 /* Complete symbol table for last object file
912 containing debugging information. */
913 if (get_last_source_file ())
915 coff_end_symtab (objfile);
916 coff_start_symtab (objfile, filestring);
921 /* C_LABEL is used for labels and static functions.
922 Including it here allows gdb to see static functions when
923 no debug info is available. */
925 /* However, labels within a function can make weird
926 backtraces, so filter them out (from phdm@macqel.be). */
933 case C_THUMBSTATFUNC:
934 if (cs->c_name[0] == '.')
936 if (strcmp (cs->c_name, ".text") == 0)
938 /* FIXME: don't wire in ".text" as section name or
940 /* Check for in_source_file deals with case of a
941 file with debugging symbols followed by a later
942 file with no symbols. */
944 complete_symtab (filestring,
945 cs->c_value + ANOFFSET (objfile->section_offsets,
946 SECT_OFF_TEXT (objfile)),
947 main_aux.x_scn.x_scnlen);
950 /* Flush rest of '.' symbols. */
953 else if (!SDB_TYPE (cs->c_type)
954 && cs->c_name[0] == 'L'
955 && (startswith (cs->c_name, "LI%")
956 || startswith (cs->c_name, "LF%")
957 || startswith (cs->c_name, "LC%")
958 || startswith (cs->c_name, "LP%")
959 || startswith (cs->c_name, "LPB%")
960 || startswith (cs->c_name, "LBB%")
961 || startswith (cs->c_name, "LBE%")
962 || startswith (cs->c_name, "LPBX%")))
963 /* At least on a 3b1, gcc generates swbeg and string labels
964 that look like this. Ignore them. */
966 /* For static symbols that don't start with '.'... */
972 /* Record it in the minimal symbols regardless of
973 SDB_TYPE. This parallels what we do for other debug
974 formats, and probably is needed to make
975 print_address_symbolic work right without the (now
976 gone) "set fast-symbolic-addr off" kludge. */
978 enum minimal_symbol_type ms_type;
980 CORE_ADDR offset = 0;
982 if (cs->c_secnum == N_UNDEF)
984 /* This is a common symbol. We used to rely on
985 the target to tell us whether it knows where
986 the symbol has been relocated to, but none of
987 the target implementations actually provided
988 that operation. So we just ignore the symbol,
989 the same way we would do if we had a target-side
990 symbol lookup which returned no match. */
993 else if (cs->c_secnum == N_ABS)
995 /* Use the correct minimal symbol type (and don't
996 relocate) for absolute values. */
998 sec = cs_to_section (cs, objfile);
999 tmpaddr = cs->c_value;
1003 asection *bfd_section = cs_to_bfd_section (cs, objfile);
1005 sec = cs_to_section (cs, objfile);
1006 tmpaddr = cs->c_value;
1007 /* Statics in a PE file also get relocated. */
1008 if (cs->c_sclass == C_EXT
1009 || cs->c_sclass == C_THUMBEXTFUNC
1010 || cs->c_sclass == C_THUMBEXT
1011 || (pe_file && (cs->c_sclass == C_STAT)))
1012 offset = ANOFFSET (objfile->section_offsets, sec);
1014 if (bfd_section->flags & SEC_CODE)
1017 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC
1018 || cs->c_sclass == C_THUMBEXT ?
1019 mst_text : mst_file_text;
1020 tmpaddr = gdbarch_addr_bits_remove (gdbarch, tmpaddr);
1022 else if (bfd_section->flags & SEC_ALLOC
1023 && bfd_section->flags & SEC_LOAD)
1026 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1027 ? mst_data : mst_file_data;
1029 else if (bfd_section->flags & SEC_ALLOC)
1032 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1033 ? mst_bss : mst_file_bss;
1036 ms_type = mst_unknown;
1039 msym = record_minimal_symbol (reader, cs, tmpaddr, ms_type,
1042 gdbarch_coff_make_msymbol_special (gdbarch,
1043 cs->c_sclass, msym);
1045 if (SDB_TYPE (cs->c_type))
1049 sym = process_coff_symbol
1050 (cs, &main_aux, objfile);
1051 SYMBOL_VALUE (sym) = tmpaddr + offset;
1052 SYMBOL_SECTION (sym) = sec;
1058 if (strcmp (cs->c_name, ".bf") == 0)
1060 within_function = 1;
1062 /* Value contains address of first non-init type
1064 /* main_aux.x_sym.x_misc.x_lnsz.x_lnno
1065 contains line number of '{' }. */
1066 if (cs->c_naux != 1)
1067 complaint (_("`.bf' symbol %d has no aux entry"),
1069 fcn_first_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1070 fcn_first_line_addr = cs->c_value;
1072 /* Might want to check that locals are 0 and
1073 context_stack_depth is zero, and complain if not. */
1076 newobj = push_context (depth, fcn_start_addr);
1077 fcn_cs_saved.c_name = getsymname (&fcn_sym_saved);
1079 process_coff_symbol (&fcn_cs_saved,
1080 &fcn_aux_saved, objfile);
1082 else if (strcmp (cs->c_name, ".ef") == 0)
1084 if (!within_function)
1085 error (_("Bad coff function information."));
1086 /* The value of .ef is the address of epilogue code;
1087 not useful for gdb. */
1088 /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
1089 contains number of lines to '}' */
1091 if (context_stack_depth <= 0)
1092 { /* We attempted to pop an empty context stack. */
1093 complaint (_("`.ef' symbol without matching `.bf' "
1094 "symbol ignored starting at symnum %d"),
1096 within_function = 0;
1100 newobj = pop_context ();
1101 /* Stack must be empty now. */
1102 if (context_stack_depth > 0 || newobj == NULL)
1104 complaint (_("Unmatched .ef symbol(s) ignored "
1105 "starting at symnum %d"),
1107 within_function = 0;
1110 if (cs->c_naux != 1)
1112 complaint (_("`.ef' symbol %d has no aux entry"),
1114 fcn_last_line = 0x7FFFFFFF;
1118 fcn_last_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1120 /* fcn_first_line is the line number of the opening '{'.
1121 Do not record it - because it would affect gdb's idea
1122 of the line number of the first statement of the
1123 function - except for one-line functions, for which
1124 it is also the line number of all the statements and
1125 of the closing '}', and for which we do not have any
1126 other statement-line-number. */
1127 if (fcn_last_line == 1)
1128 record_line (current_subfile, fcn_first_line,
1129 gdbarch_addr_bits_remove (gdbarch,
1130 fcn_first_line_addr));
1132 enter_linenos (fcn_line_ptr, fcn_first_line,
1133 fcn_last_line, objfile);
1135 finish_block (newobj->name, &local_symbols, newobj->old_blocks,
1136 NULL, newobj->start_addr,
1137 fcn_cs_saved.c_value
1138 + fcn_aux_saved.x_sym.x_misc.x_fsize
1139 + ANOFFSET (objfile->section_offsets,
1140 SECT_OFF_TEXT (objfile)));
1141 within_function = 0;
1146 if (strcmp (cs->c_name, ".bb") == 0)
1148 tmpaddr = cs->c_value;
1149 tmpaddr += ANOFFSET (objfile->section_offsets,
1150 SECT_OFF_TEXT (objfile));
1151 push_context (++depth, tmpaddr);
1153 else if (strcmp (cs->c_name, ".eb") == 0)
1155 if (context_stack_depth <= 0)
1156 { /* We attempted to pop an empty context stack. */
1157 complaint (_("`.eb' symbol without matching `.bb' "
1158 "symbol ignored starting at symnum %d"),
1163 newobj = pop_context ();
1164 if (depth-- != newobj->depth)
1166 complaint (_("Mismatched .eb symbol ignored "
1167 "starting at symnum %d"),
1171 if (local_symbols && context_stack_depth > 0)
1174 cs->c_value + ANOFFSET (objfile->section_offsets,
1175 SECT_OFF_TEXT (objfile));
1176 /* Make a block for the local symbols within. */
1177 finish_block (0, &local_symbols, newobj->old_blocks, NULL,
1178 newobj->start_addr, tmpaddr);
1180 /* Now pop locals of block just finished. */
1181 local_symbols = newobj->locals;
1186 process_coff_symbol (cs, &main_aux, objfile);
1191 if ((nsyms == 0) && (pe_file))
1193 /* We've got no debugging symbols, but it's a portable
1194 executable, so try to read the export table. */
1195 read_pe_exported_syms (reader, objfile);
1198 if (get_last_source_file ())
1199 coff_end_symtab (objfile);
1201 /* Patch up any opaque types (references to types that are not defined
1202 in the file where they are referenced, e.g. "struct foo *bar"). */
1204 struct compunit_symtab *cu;
1207 ALL_OBJFILE_FILETABS (objfile, cu, s)
1208 patch_opaque_types (s);
1211 coffread_objfile = NULL;
1214 /* Routines for reading headers and symbols from executable. */
1216 /* Read the next symbol, swap it, and return it in both
1217 internal_syment form, and coff_symbol form. Also return its first
1218 auxent, if any, in internal_auxent form, and skip any other
1222 read_one_sym (struct coff_symbol *cs,
1223 struct internal_syment *sym,
1224 union internal_auxent *aux)
1227 bfd_size_type bytes;
1229 cs->c_symnum = symnum;
1230 bytes = bfd_bread (temp_sym, local_symesz, nlist_bfd_global);
1231 if (bytes != local_symesz)
1232 error (_("%s: error reading symbols"), objfile_name (coffread_objfile));
1233 bfd_coff_swap_sym_in (symfile_bfd, temp_sym, (char *) sym);
1234 cs->c_naux = sym->n_numaux & 0xff;
1235 if (cs->c_naux >= 1)
1237 bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1238 if (bytes != local_auxesz)
1239 error (_("%s: error reading symbols"), objfile_name (coffread_objfile));
1240 bfd_coff_swap_aux_in (symfile_bfd, temp_aux,
1241 sym->n_type, sym->n_sclass,
1242 0, cs->c_naux, (char *) aux);
1243 /* If more than one aux entry, read past it (only the first aux
1245 for (i = 1; i < cs->c_naux; i++)
1247 bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1248 if (bytes != local_auxesz)
1249 error (_("%s: error reading symbols"),
1250 objfile_name (coffread_objfile));
1253 cs->c_name = getsymname (sym);
1254 cs->c_value = sym->n_value;
1255 cs->c_sclass = (sym->n_sclass & 0xff);
1256 cs->c_secnum = sym->n_scnum;
1257 cs->c_type = (unsigned) sym->n_type;
1258 if (!SDB_TYPE (cs->c_type))
1262 if (cs->c_sclass & 128)
1263 printf (_("thumb symbol %s, class 0x%x\n"), cs->c_name, cs->c_sclass);
1266 symnum += 1 + cs->c_naux;
1268 /* The PE file format stores symbol values as offsets within the
1269 section, rather than as absolute addresses. We correct that
1270 here, if the symbol has an appropriate storage class. FIXME: We
1271 should use BFD to read the symbols, rather than duplicating the
1275 switch (cs->c_sclass)
1279 case C_THUMBEXTFUNC:
1284 case C_THUMBSTATFUNC:
1290 if (cs->c_secnum != 0)
1291 cs->c_value += cs_section_address (cs, symfile_bfd);
1297 /* Support for string table handling. */
1299 static char *stringtab = NULL;
1302 init_stringtab (bfd *abfd, long offset)
1306 unsigned char lengthbuf[4];
1310 /* If the file is stripped, the offset might be zero, indicating no
1311 string table. Just return with `stringtab' set to null. */
1315 if (bfd_seek (abfd, offset, 0) < 0)
1318 val = bfd_bread ((char *) lengthbuf, sizeof lengthbuf, abfd);
1319 length = bfd_h_get_32 (symfile_bfd, lengthbuf);
1321 /* If no string table is needed, then the file may end immediately
1322 after the symbols. Just return with `stringtab' set to null. */
1323 if (val != sizeof lengthbuf || length < sizeof lengthbuf)
1326 stringtab = (char *) xmalloc (length);
1327 /* This is in target format (probably not very useful, and not
1328 currently used), not host format. */
1329 memcpy (stringtab, lengthbuf, sizeof lengthbuf);
1330 if (length == sizeof length) /* Empty table -- just the count. */
1333 val = bfd_bread (stringtab + sizeof lengthbuf,
1334 length - sizeof lengthbuf, abfd);
1335 if (val != length - sizeof lengthbuf || stringtab[length - 1] != '\0')
1342 free_stringtab (void)
1350 free_stringtab_cleanup (void *ignore)
1356 getsymname (struct internal_syment *symbol_entry)
1358 static char buffer[SYMNMLEN + 1];
1361 if (symbol_entry->_n._n_n._n_zeroes == 0)
1363 /* FIXME: Probably should be detecting corrupt symbol files by
1364 seeing whether offset points to within the stringtab. */
1365 result = stringtab + symbol_entry->_n._n_n._n_offset;
1369 strncpy (buffer, symbol_entry->_n._n_name, SYMNMLEN);
1370 buffer[SYMNMLEN] = '\0';
1376 /* Extract the file name from the aux entry of a C_FILE symbol.
1377 Return only the last component of the name. Result is in static
1378 storage and is only good for temporary use. */
1381 coff_getfilename (union internal_auxent *aux_entry)
1383 static char buffer[BUFSIZ];
1386 if (aux_entry->x_file.x_n.x_zeroes == 0)
1388 if (strlen (stringtab + aux_entry->x_file.x_n.x_offset) >= BUFSIZ)
1389 internal_error (__FILE__, __LINE__, _("coff file name too long"));
1390 strcpy (buffer, stringtab + aux_entry->x_file.x_n.x_offset);
1394 strncpy (buffer, aux_entry->x_file.x_fname, FILNMLEN);
1395 buffer[FILNMLEN] = '\0';
1399 /* FIXME: We should not be throwing away the information about what
1400 directory. It should go into dirname of the symtab, or some such
1402 result = lbasename (result);
1406 /* Support for line number handling. */
1408 static char *linetab = NULL;
1409 static long linetab_offset;
1410 static unsigned long linetab_size;
1412 /* Read in all the line numbers for fast lookups later. Leave them in
1413 external (unswapped) format in memory; we'll swap them as we enter
1414 them into GDB's data structures. */
1417 init_lineno (bfd *abfd, long offset, int size)
1421 linetab_offset = offset;
1422 linetab_size = size;
1429 if (bfd_seek (abfd, offset, 0) < 0)
1432 /* Allocate the desired table, plus a sentinel. */
1433 linetab = (char *) xmalloc (size + local_linesz);
1435 val = bfd_bread (linetab, size, abfd);
1439 /* Terminate it with an all-zero sentinel record. */
1440 memset (linetab + size, 0, local_linesz);
1454 free_linetab_cleanup (void *ignore)
1459 #if !defined (L_LNNO32)
1460 #define L_LNNO32(lp) ((lp)->l_lnno)
1464 enter_linenos (long file_offset, int first_line,
1465 int last_line, struct objfile *objfile)
1467 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1469 struct internal_lineno lptr;
1473 if (file_offset < linetab_offset)
1475 complaint (_("Line number pointer %ld lower than start of line numbers"),
1477 if (file_offset > linetab_size) /* Too big to be an offset? */
1479 file_offset += linetab_offset; /* Try reading at that linetab
1483 rawptr = &linetab[file_offset - linetab_offset];
1485 /* Skip first line entry for each function. */
1486 rawptr += local_linesz;
1487 /* Line numbers start at one for the first line of the function. */
1490 /* If the line number table is full (e.g. 64K lines in COFF debug
1491 info), the next function's L_LNNO32 might not be zero, so don't
1492 overstep the table's end in any case. */
1493 while (rawptr <= &linetab[0] + linetab_size)
1495 bfd_coff_swap_lineno_in (symfile_bfd, rawptr, &lptr);
1496 rawptr += local_linesz;
1497 /* The next function, or the sentinel, will have L_LNNO32 zero;
1499 if (L_LNNO32 (&lptr) && L_LNNO32 (&lptr) <= last_line)
1501 CORE_ADDR addr = lptr.l_addr.l_paddr;
1502 addr += ANOFFSET (objfile->section_offsets,
1503 SECT_OFF_TEXT (objfile));
1504 record_line (current_subfile,
1505 first_line + L_LNNO32 (&lptr),
1506 gdbarch_addr_bits_remove (gdbarch, addr));
1514 patch_type (struct type *type, struct type *real_type)
1516 struct type *target = TYPE_TARGET_TYPE (type);
1517 struct type *real_target = TYPE_TARGET_TYPE (real_type);
1518 int field_size = TYPE_NFIELDS (real_target) * sizeof (struct field);
1520 TYPE_LENGTH (target) = TYPE_LENGTH (real_target);
1521 TYPE_NFIELDS (target) = TYPE_NFIELDS (real_target);
1522 TYPE_FIELDS (target) = (struct field *) TYPE_ALLOC (target,
1525 memcpy (TYPE_FIELDS (target),
1526 TYPE_FIELDS (real_target),
1529 if (TYPE_NAME (real_target))
1531 /* The previous copy of TYPE_NAME is allocated by
1532 process_coff_symbol. */
1533 if (TYPE_NAME (target))
1534 xfree ((char*) TYPE_NAME (target));
1535 TYPE_NAME (target) = xstrdup (TYPE_NAME (real_target));
1539 /* Patch up all appropriate typedef symbols in the opaque_type_chains
1540 so that they can be used to print out opaque data structures
1544 patch_opaque_types (struct symtab *s)
1547 struct block_iterator iter;
1548 struct symbol *real_sym;
1550 /* Go through the per-file symbols only. */
1551 b = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (s), STATIC_BLOCK);
1552 ALL_BLOCK_SYMBOLS (b, iter, real_sym)
1554 /* Find completed typedefs to use to fix opaque ones.
1555 Remove syms from the chain when their types are stored,
1556 but search the whole chain, as there may be several syms
1557 from different files with the same name. */
1558 if (SYMBOL_CLASS (real_sym) == LOC_TYPEDEF
1559 && SYMBOL_DOMAIN (real_sym) == VAR_DOMAIN
1560 && TYPE_CODE (SYMBOL_TYPE (real_sym)) == TYPE_CODE_PTR
1561 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym))) != 0)
1563 const char *name = SYMBOL_LINKAGE_NAME (real_sym);
1564 int hash = hashname (name);
1565 struct symbol *sym, *prev;
1568 for (sym = opaque_type_chain[hash]; sym;)
1570 if (name[0] == SYMBOL_LINKAGE_NAME (sym)[0]
1571 && strcmp (name + 1, SYMBOL_LINKAGE_NAME (sym) + 1) == 0)
1575 SYMBOL_VALUE_CHAIN (prev) = SYMBOL_VALUE_CHAIN (sym);
1579 opaque_type_chain[hash] = SYMBOL_VALUE_CHAIN (sym);
1582 patch_type (SYMBOL_TYPE (sym), SYMBOL_TYPE (real_sym));
1586 sym = SYMBOL_VALUE_CHAIN (prev);
1590 sym = opaque_type_chain[hash];
1596 sym = SYMBOL_VALUE_CHAIN (sym);
1604 coff_reg_to_regnum (struct symbol *sym, struct gdbarch *gdbarch)
1606 return gdbarch_sdb_reg_to_regnum (gdbarch, SYMBOL_VALUE (sym));
1609 static const struct symbol_register_ops coff_register_funcs = {
1613 /* The "aclass" index for computed COFF symbols. */
1615 static int coff_register_index;
1617 static struct symbol *
1618 process_coff_symbol (struct coff_symbol *cs,
1619 union internal_auxent *aux,
1620 struct objfile *objfile)
1622 struct symbol *sym = allocate_symbol (objfile);
1626 name = EXTERNAL_NAME (name, objfile->obfd);
1627 SYMBOL_SET_LANGUAGE (sym, current_subfile->language,
1628 &objfile->objfile_obstack);
1629 SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
1631 /* default assumptions */
1632 SYMBOL_VALUE (sym) = cs->c_value;
1633 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1634 SYMBOL_SECTION (sym) = cs_to_section (cs, objfile);
1636 if (ISFCN (cs->c_type))
1638 SYMBOL_VALUE (sym) += ANOFFSET (objfile->section_offsets,
1639 SECT_OFF_TEXT (objfile));
1641 lookup_function_type (decode_function_type (cs, cs->c_type,
1644 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
1645 if (cs->c_sclass == C_STAT || cs->c_sclass == C_THUMBSTAT
1646 || cs->c_sclass == C_THUMBSTATFUNC)
1647 add_symbol_to_list (sym, &file_symbols);
1648 else if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1649 || cs->c_sclass == C_THUMBEXTFUNC)
1650 add_symbol_to_list (sym, &global_symbols);
1654 SYMBOL_TYPE (sym) = decode_type (cs, cs->c_type, aux, objfile);
1655 switch (cs->c_sclass)
1661 SYMBOL_ACLASS_INDEX (sym) = LOC_LOCAL;
1662 add_symbol_to_list (sym, &local_symbols);
1666 case C_THUMBEXTFUNC:
1668 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
1669 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1670 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
1671 SECT_OFF_TEXT (objfile));
1672 add_symbol_to_list (sym, &global_symbols);
1676 case C_THUMBSTATFUNC:
1678 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
1679 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1680 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
1681 SECT_OFF_TEXT (objfile));
1682 if (within_function)
1684 /* Static symbol of local scope. */
1685 add_symbol_to_list (sym, &local_symbols);
1689 /* Static symbol at top level of file. */
1690 add_symbol_to_list (sym, &file_symbols);
1694 #ifdef C_GLBLREG /* AMD coff */
1698 SYMBOL_ACLASS_INDEX (sym) = coff_register_index;
1699 SYMBOL_VALUE (sym) = cs->c_value;
1700 add_symbol_to_list (sym, &local_symbols);
1708 SYMBOL_ACLASS_INDEX (sym) = LOC_ARG;
1709 SYMBOL_IS_ARGUMENT (sym) = 1;
1710 add_symbol_to_list (sym, &local_symbols);
1714 SYMBOL_ACLASS_INDEX (sym) = coff_register_index;
1715 SYMBOL_IS_ARGUMENT (sym) = 1;
1716 SYMBOL_VALUE (sym) = cs->c_value;
1717 add_symbol_to_list (sym, &local_symbols);
1721 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
1722 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1724 /* If type has no name, give it one. */
1725 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
1727 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1728 || TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_FUNC)
1730 /* If we are giving a name to a type such as
1731 "pointer to foo" or "function returning foo", we
1732 better not set the TYPE_NAME. If the program
1733 contains "typedef char *caddr_t;", we don't want
1734 all variables of type char * to print as caddr_t.
1735 This is not just a consequence of GDB's type
1736 management; CC and GCC (at least through version
1737 2.4) both output variables of either type char *
1738 or caddr_t with the type refering to the C_TPDEF
1739 symbol for caddr_t. If a future compiler cleans
1740 this up it GDB is not ready for it yet, but if it
1741 becomes ready we somehow need to disable this
1742 check (without breaking the PCC/GCC2.4 case).
1746 Fortunately, this check seems not to be necessary
1747 for anything except pointers or functions. */
1751 TYPE_NAME (SYMBOL_TYPE (sym)) =
1752 xstrdup (SYMBOL_LINKAGE_NAME (sym));
1755 /* Keep track of any type which points to empty structured
1756 type, so it can be filled from a definition from another
1757 file. A simple forward reference (TYPE_CODE_UNDEF) is
1758 not an empty structured type, though; the forward
1759 references work themselves out via the magic of
1760 coff_lookup_type. */
1761 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1762 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym))) == 0
1763 && TYPE_CODE (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)))
1766 int i = hashname (SYMBOL_LINKAGE_NAME (sym));
1768 SYMBOL_VALUE_CHAIN (sym) = opaque_type_chain[i];
1769 opaque_type_chain[i] = sym;
1771 add_symbol_to_list (sym, &file_symbols);
1777 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
1778 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
1780 /* Some compilers try to be helpful by inventing "fake"
1781 names for anonymous enums, structures, and unions, like
1782 "~0fake" or ".0fake". Thanks, but no thanks... */
1783 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
1784 if (SYMBOL_LINKAGE_NAME (sym) != NULL
1785 && *SYMBOL_LINKAGE_NAME (sym) != '~'
1786 && *SYMBOL_LINKAGE_NAME (sym) != '.')
1787 TYPE_NAME (SYMBOL_TYPE (sym)) =
1788 concat (SYMBOL_LINKAGE_NAME (sym), (char *)NULL);
1790 add_symbol_to_list (sym, &file_symbols);
1800 /* Decode a coff type specifier; return the type that is meant. */
1802 static struct type *
1803 decode_type (struct coff_symbol *cs, unsigned int c_type,
1804 union internal_auxent *aux, struct objfile *objfile)
1806 struct type *type = 0;
1807 unsigned int new_c_type;
1809 if (c_type & ~N_BTMASK)
1811 new_c_type = DECREF (c_type);
1814 type = decode_type (cs, new_c_type, aux, objfile);
1815 type = lookup_pointer_type (type);
1817 else if (ISFCN (c_type))
1819 type = decode_type (cs, new_c_type, aux, objfile);
1820 type = lookup_function_type (type);
1822 else if (ISARY (c_type))
1825 unsigned short *dim;
1826 struct type *base_type, *index_type, *range_type;
1828 /* Define an array type. */
1829 /* auxent refers to array, not base type. */
1830 if (aux->x_sym.x_tagndx.l == 0)
1833 /* Shift the indices down. */
1834 dim = &aux->x_sym.x_fcnary.x_ary.x_dimen[0];
1837 for (i = 0; *dim && i < DIMNUM - 1; i++, dim++)
1841 base_type = decode_type (cs, new_c_type, aux, objfile);
1842 index_type = objfile_type (objfile)->builtin_int;
1844 = create_static_range_type ((struct type *) NULL,
1845 index_type, 0, n - 1);
1847 create_array_type ((struct type *) NULL,
1848 base_type, range_type);
1853 /* Reference to existing type. This only occurs with the struct,
1854 union, and enum types. EPI a29k coff fakes us out by producing
1855 aux entries with a nonzero x_tagndx for definitions of structs,
1856 unions, and enums, so we have to check the c_sclass field. SCO
1857 3.2v4 cc gets confused with pointers to pointers to defined
1858 structs, and generates negative x_tagndx fields. */
1859 if (cs->c_naux > 0 && aux->x_sym.x_tagndx.l != 0)
1861 if (cs->c_sclass != C_STRTAG
1862 && cs->c_sclass != C_UNTAG
1863 && cs->c_sclass != C_ENTAG
1864 && aux->x_sym.x_tagndx.l >= 0)
1866 type = coff_alloc_type (aux->x_sym.x_tagndx.l);
1871 complaint (_("Symbol table entry for %s has bad tagndx value"),
1873 /* And fall through to decode_base_type... */
1877 return decode_base_type (cs, BTYPE (c_type), aux, objfile);
1880 /* Decode a coff type specifier for function definition;
1881 return the type that the function returns. */
1883 static struct type *
1884 decode_function_type (struct coff_symbol *cs,
1885 unsigned int c_type,
1886 union internal_auxent *aux,
1887 struct objfile *objfile)
1889 if (aux->x_sym.x_tagndx.l == 0)
1890 cs->c_naux = 0; /* auxent refers to function, not base
1893 return decode_type (cs, DECREF (c_type), aux, objfile);
1896 /* Basic C types. */
1898 static struct type *
1899 decode_base_type (struct coff_symbol *cs,
1900 unsigned int c_type,
1901 union internal_auxent *aux,
1902 struct objfile *objfile)
1904 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1910 /* Shows up with "void (*foo)();" structure members. */
1911 return objfile_type (objfile)->builtin_void;
1915 /* Intel 960 COFF has this symbol and meaning. */
1916 return objfile_type (objfile)->builtin_void;
1920 return objfile_type (objfile)->builtin_char;
1923 return objfile_type (objfile)->builtin_short;
1926 return objfile_type (objfile)->builtin_int;
1929 if (cs->c_sclass == C_FIELD
1930 && aux->x_sym.x_misc.x_lnsz.x_size
1931 > gdbarch_long_bit (gdbarch))
1932 return objfile_type (objfile)->builtin_long_long;
1934 return objfile_type (objfile)->builtin_long;
1937 return objfile_type (objfile)->builtin_float;
1940 return objfile_type (objfile)->builtin_double;
1943 return objfile_type (objfile)->builtin_long_double;
1946 if (cs->c_naux != 1)
1948 /* Anonymous structure type. */
1949 type = coff_alloc_type (cs->c_symnum);
1950 TYPE_CODE (type) = TYPE_CODE_STRUCT;
1951 TYPE_NAME (type) = NULL;
1952 INIT_CPLUS_SPECIFIC (type);
1953 TYPE_LENGTH (type) = 0;
1954 TYPE_FIELDS (type) = 0;
1955 TYPE_NFIELDS (type) = 0;
1959 type = coff_read_struct_type (cs->c_symnum,
1960 aux->x_sym.x_misc.x_lnsz.x_size,
1961 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1967 if (cs->c_naux != 1)
1969 /* Anonymous union type. */
1970 type = coff_alloc_type (cs->c_symnum);
1971 TYPE_NAME (type) = NULL;
1972 INIT_CPLUS_SPECIFIC (type);
1973 TYPE_LENGTH (type) = 0;
1974 TYPE_FIELDS (type) = 0;
1975 TYPE_NFIELDS (type) = 0;
1979 type = coff_read_struct_type (cs->c_symnum,
1980 aux->x_sym.x_misc.x_lnsz.x_size,
1981 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1984 TYPE_CODE (type) = TYPE_CODE_UNION;
1988 if (cs->c_naux != 1)
1990 /* Anonymous enum type. */
1991 type = coff_alloc_type (cs->c_symnum);
1992 TYPE_CODE (type) = TYPE_CODE_ENUM;
1993 TYPE_NAME (type) = NULL;
1994 TYPE_LENGTH (type) = 0;
1995 TYPE_FIELDS (type) = 0;
1996 TYPE_NFIELDS (type) = 0;
2000 type = coff_read_enum_type (cs->c_symnum,
2001 aux->x_sym.x_misc.x_lnsz.x_size,
2002 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
2008 /* Shouldn't show up here. */
2012 return objfile_type (objfile)->builtin_unsigned_char;
2015 return objfile_type (objfile)->builtin_unsigned_short;
2018 return objfile_type (objfile)->builtin_unsigned_int;
2021 if (cs->c_sclass == C_FIELD
2022 && aux->x_sym.x_misc.x_lnsz.x_size
2023 > gdbarch_long_bit (gdbarch))
2024 return objfile_type (objfile)->builtin_unsigned_long_long;
2026 return objfile_type (objfile)->builtin_unsigned_long;
2028 complaint (_("Unexpected type for symbol %s"), cs->c_name);
2029 return objfile_type (objfile)->builtin_void;
2032 /* This page contains subroutines of read_type. */
2034 /* Read the description of a structure (or union type) and return an
2035 object describing the type. */
2037 static struct type *
2038 coff_read_struct_type (int index, int length, int lastsym,
2039 struct objfile *objfile)
2043 struct nextfield *next;
2048 struct nextfield *list = 0;
2049 struct nextfield *newobj;
2053 struct coff_symbol member_sym;
2054 struct coff_symbol *ms = &member_sym;
2055 struct internal_syment sub_sym;
2056 union internal_auxent sub_aux;
2059 type = coff_alloc_type (index);
2060 TYPE_CODE (type) = TYPE_CODE_STRUCT;
2061 INIT_CPLUS_SPECIFIC (type);
2062 TYPE_LENGTH (type) = length;
2064 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2066 read_one_sym (ms, &sub_sym, &sub_aux);
2068 name = EXTERNAL_NAME (name, objfile->obfd);
2070 switch (ms->c_sclass)
2075 /* Get space to record the next field's data. */
2076 newobj = XALLOCA (struct nextfield);
2077 newobj->next = list;
2080 /* Save the data. */
2082 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
2083 name, strlen (name));
2084 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type,
2086 SET_FIELD_BITPOS (list->field, 8 * ms->c_value);
2087 FIELD_BITSIZE (list->field) = 0;
2093 /* Get space to record the next field's data. */
2094 newobj = XALLOCA (struct nextfield);
2095 newobj->next = list;
2098 /* Save the data. */
2100 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
2101 name, strlen (name));
2102 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type,
2104 SET_FIELD_BITPOS (list->field, ms->c_value);
2105 FIELD_BITSIZE (list->field) = sub_aux.x_sym.x_misc.x_lnsz.x_size;
2114 /* Now create the vector of fields, and record how big it is. */
2116 TYPE_NFIELDS (type) = nfields;
2117 TYPE_FIELDS (type) = (struct field *)
2118 TYPE_ALLOC (type, sizeof (struct field) * nfields);
2120 /* Copy the saved-up fields into the field vector. */
2122 for (n = nfields; list; list = list->next)
2123 TYPE_FIELD (type, --n) = list->field;
2128 /* Read a definition of an enumeration type,
2129 and create and return a suitable type object.
2130 Also defines the symbols that represent the values of the type. */
2132 static struct type *
2133 coff_read_enum_type (int index, int length, int lastsym,
2134 struct objfile *objfile)
2136 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2141 struct pending **symlist;
2142 struct coff_symbol member_sym;
2143 struct coff_symbol *ms = &member_sym;
2144 struct internal_syment sub_sym;
2145 union internal_auxent sub_aux;
2146 struct pending *osyms, *syms;
2150 int unsigned_enum = 1;
2152 type = coff_alloc_type (index);
2153 if (within_function)
2154 symlist = &local_symbols;
2156 symlist = &file_symbols;
2158 o_nsyms = osyms ? osyms->nsyms : 0;
2160 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2162 read_one_sym (ms, &sub_sym, &sub_aux);
2164 name = EXTERNAL_NAME (name, objfile->obfd);
2166 switch (ms->c_sclass)
2169 sym = allocate_symbol (objfile);
2171 name = (char *) obstack_copy0 (&objfile->objfile_obstack, name,
2173 SYMBOL_SET_LINKAGE_NAME (sym, name);
2174 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
2175 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2176 SYMBOL_VALUE (sym) = ms->c_value;
2177 add_symbol_to_list (sym, symlist);
2182 /* Sometimes the linker (on 386/ix 2.0.2 at least) screws
2183 up the count of how many symbols to read. So stop
2190 /* Now fill in the fields of the type-structure. */
2193 TYPE_LENGTH (type) = length;
2194 else /* Assume ints. */
2195 TYPE_LENGTH (type) = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
2196 TYPE_CODE (type) = TYPE_CODE_ENUM;
2197 TYPE_NFIELDS (type) = nsyms;
2198 TYPE_FIELDS (type) = (struct field *)
2199 TYPE_ALLOC (type, sizeof (struct field) * nsyms);
2201 /* Find the symbols for the values and put them into the type.
2202 The symbols can be found in the symlist that we put them on
2203 to cause them to be defined. osyms contains the old value
2204 of that symlist; everything up to there was defined by us. */
2205 /* Note that we preserve the order of the enum constants, so
2206 that in something like "enum {FOO, LAST_THING=FOO}" we print
2207 FOO, not LAST_THING. */
2209 for (syms = *symlist, n = 0; syms; syms = syms->next)
2215 for (; j < syms->nsyms; j++, n++)
2217 struct symbol *xsym = syms->symbol[j];
2219 SYMBOL_TYPE (xsym) = type;
2220 TYPE_FIELD_NAME (type, n) = SYMBOL_LINKAGE_NAME (xsym);
2221 SET_FIELD_ENUMVAL (TYPE_FIELD (type, n), SYMBOL_VALUE (xsym));
2222 if (SYMBOL_VALUE (xsym) < 0)
2224 TYPE_FIELD_BITSIZE (type, n) = 0;
2231 TYPE_UNSIGNED (type) = 1;
2236 /* Register our ability to parse symbols for coff BFD files. */
2238 static const struct sym_fns coff_sym_fns =
2240 coff_new_init, /* sym_new_init: init anything gbl to
2242 coff_symfile_init, /* sym_init: read initial info, setup
2244 coff_symfile_read, /* sym_read: read a symbol file into
2246 NULL, /* sym_read_psymbols */
2247 coff_symfile_finish, /* sym_finish: finished with file,
2249 default_symfile_offsets, /* sym_offsets: xlate external to
2251 default_symfile_segments, /* sym_segments: Get segment
2252 information from a file */
2253 NULL, /* sym_read_linetable */
2255 default_symfile_relocate, /* sym_relocate: Relocate a debug
2257 NULL, /* sym_probe_fns */
2261 /* Free the per-objfile COFF data. */
2264 coff_free_info (struct objfile *objfile, void *arg)
2270 _initialize_coffread (void)
2272 add_symtab_fns (bfd_target_coff_flavour, &coff_sym_fns);
2274 coff_objfile_data_key = register_objfile_data_with_cleanup (NULL,
2278 = register_symbol_register_impl (LOC_REGISTER, &coff_register_funcs);