1 /* Read coff symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1987-2019 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 */
33 #include "buildsym-legacy.h"
34 #include "stabsread.h"
35 #include "complaints.h"
38 #include "dictionary.h"
40 #include "coff-pe-read.h"
45 /* The objfile we are currently reading. */
47 static struct objfile *coffread_objfile;
49 struct coff_symfile_info
51 file_ptr min_lineno_offset = 0; /* Where in file lowest line#s are. */
52 file_ptr max_lineno_offset = 0; /* 1+last byte of line#s in file. */
54 CORE_ADDR textaddr = 0; /* Addr of .text section. */
55 unsigned int textsize = 0; /* Size of .text section. */
56 std::vector<asection *> *stabsects; /* .stab sections. */
57 asection *stabstrsect = nullptr; /* Section pointer for .stab section. */
58 char *stabstrdata = nullptr;
61 /* Key for COFF-associated data. */
63 static const struct objfile_key<coff_symfile_info> coff_objfile_data_key;
65 /* Translate an external name string into a user-visible name. */
66 #define EXTERNAL_NAME(string, abfd) \
67 (string[0] == bfd_get_symbol_leading_char (abfd) \
68 ? string + 1 : string)
70 /* To be an sdb debug type, type must have at least a basic or primary
71 derived type. Using this rather than checking against T_NULL is
72 said to prevent core dumps if we try to operate on Michael Bloom
75 #define SDB_TYPE(type) (BTYPE(type) | (type & N_TMASK))
77 /* Core address of start and end of text of current source file.
78 This comes from a ".text" symbol where x_nlinno > 0. */
80 static CORE_ADDR current_source_start_addr;
81 static CORE_ADDR current_source_end_addr;
83 /* The addresses of the symbol table stream and number of symbols
84 of the object file we are reading (as copied into core). */
86 static bfd *nlist_bfd_global;
87 static int nlist_nsyms_global;
90 /* Pointers to scratch storage, used for reading raw symbols and
93 static char *temp_sym;
94 static char *temp_aux;
96 /* Local variables that hold the shift and mask values for the
97 COFF file that we are currently reading. These come back to us
98 from BFD, and are referenced by their macro names, as well as
99 internally to the BTYPE, ISPTR, ISFCN, ISARY, ISTAG, and DECREF
100 macros from include/coff/internal.h . */
102 static unsigned local_n_btmask;
103 static unsigned local_n_btshft;
104 static unsigned local_n_tmask;
105 static unsigned local_n_tshift;
107 #define N_BTMASK local_n_btmask
108 #define N_BTSHFT local_n_btshft
109 #define N_TMASK local_n_tmask
110 #define N_TSHIFT local_n_tshift
112 /* Local variables that hold the sizes in the file of various COFF
113 structures. (We only need to know this to read them from the file
114 -- BFD will then translate the data in them, into `internal_xxx'
115 structs in the right byte order, alignment, etc.) */
117 static unsigned local_linesz;
118 static unsigned local_symesz;
119 static unsigned local_auxesz;
121 /* This is set if this is a PE format file. */
125 /* Chain of typedefs of pointers to empty struct/union types.
126 They are chained thru the SYMBOL_VALUE_CHAIN. */
128 static struct symbol *opaque_type_chain[HASHSIZE];
130 /* Simplified internal version of coff symbol table information. */
135 int c_symnum; /* Symbol number of this entry. */
136 int c_naux; /* 0 if syment only, 1 if syment +
144 /* Vector of types defined so far, indexed by their type numbers. */
146 static struct type **type_vector;
148 /* Number of elements allocated for type_vector currently. */
150 static int type_vector_length;
152 /* Initial size of type vector. Is realloc'd larger if needed, and
153 realloc'd down to the size actually used, when completed. */
155 #define INITIAL_TYPE_VECTOR_LENGTH 160
157 static char *linetab = NULL;
158 static long linetab_offset;
159 static unsigned long linetab_size;
161 static char *stringtab = NULL;
163 extern void stabsread_clear_cache (void);
165 static struct type *coff_read_struct_type (int, int, int,
168 static struct type *decode_base_type (struct coff_symbol *,
170 union internal_auxent *,
173 static struct type *decode_type (struct coff_symbol *, unsigned int,
174 union internal_auxent *,
177 static struct type *decode_function_type (struct coff_symbol *,
179 union internal_auxent *,
182 static struct type *coff_read_enum_type (int, int, int,
185 static struct symbol *process_coff_symbol (struct coff_symbol *,
186 union internal_auxent *,
189 static void patch_opaque_types (struct symtab *);
191 static void enter_linenos (long, int, int, struct objfile *);
193 static int init_lineno (bfd *, long, int, gdb::unique_xmalloc_ptr<char> *);
195 static char *getsymname (struct internal_syment *);
197 static const char *coff_getfilename (union internal_auxent *);
199 static int init_stringtab (bfd *, long, gdb::unique_xmalloc_ptr<char> *);
201 static void read_one_sym (struct coff_symbol *,
202 struct internal_syment *,
203 union internal_auxent *);
205 static void coff_symtab_read (minimal_symbol_reader &,
206 long, unsigned int, struct objfile *);
208 /* We are called once per section from coff_symfile_read. We
209 need to examine each section we are passed, check to see
210 if it is something we are interested in processing, and
211 if so, stash away some access information for the section.
213 FIXME: The section names should not be hardwired strings (what
214 should they be? I don't think most object file formats have enough
215 section flags to specify what kind of debug section it is
219 coff_locate_sections (bfd *abfd, asection *sectp, void *csip)
221 struct coff_symfile_info *csi;
224 csi = (struct coff_symfile_info *) csip;
225 name = bfd_get_section_name (abfd, sectp);
226 if (strcmp (name, ".text") == 0)
228 csi->textaddr = bfd_section_vma (abfd, sectp);
229 csi->textsize += bfd_section_size (abfd, sectp);
231 else if (startswith (name, ".text"))
233 csi->textsize += bfd_section_size (abfd, sectp);
235 else if (strcmp (name, ".stabstr") == 0)
237 csi->stabstrsect = sectp;
239 else if (startswith (name, ".stab"))
243 /* We can have multiple .stab sections if linked with
245 for (s = name + sizeof ".stab" - 1; *s != '\0'; s++)
249 csi->stabsects->push_back (sectp);
253 /* Return the section_offsets* that CS points to. */
254 static int cs_to_section (struct coff_symbol *, struct objfile *);
256 struct find_targ_sec_arg
263 find_targ_sec (bfd *abfd, asection *sect, void *obj)
265 struct find_targ_sec_arg *args = (struct find_targ_sec_arg *) obj;
267 if (sect->target_index == args->targ_index)
268 *args->resultp = sect;
271 /* Return the bfd_section that CS points to. */
272 static struct bfd_section*
273 cs_to_bfd_section (struct coff_symbol *cs, struct objfile *objfile)
275 asection *sect = NULL;
276 struct find_targ_sec_arg args;
278 args.targ_index = cs->c_secnum;
279 args.resultp = §
280 bfd_map_over_sections (objfile->obfd, find_targ_sec, &args);
284 /* Return the section number (SECT_OFF_*) that CS points to. */
286 cs_to_section (struct coff_symbol *cs, struct objfile *objfile)
288 asection *sect = cs_to_bfd_section (cs, objfile);
291 return SECT_OFF_TEXT (objfile);
292 return gdb_bfd_section_index (objfile->obfd, sect);
295 /* Return the address of the section of a COFF symbol. */
297 static CORE_ADDR cs_section_address (struct coff_symbol *, bfd *);
300 cs_section_address (struct coff_symbol *cs, bfd *abfd)
302 asection *sect = NULL;
303 struct find_targ_sec_arg args;
306 args.targ_index = cs->c_secnum;
307 args.resultp = §
308 bfd_map_over_sections (abfd, find_targ_sec, &args);
310 addr = bfd_get_section_vma (abfd, sect);
314 /* Look up a coff type-number index. Return the address of the slot
315 where the type for that index is stored.
316 The type-number is in INDEX.
318 This can be used for finding the type associated with that index
319 or for associating a new type with the index. */
321 static struct type **
322 coff_lookup_type (int index)
324 if (index >= type_vector_length)
326 int old_vector_length = type_vector_length;
328 type_vector_length *= 2;
329 if (index /* is still */ >= type_vector_length)
330 type_vector_length = index * 2;
332 type_vector = (struct type **)
333 xrealloc ((char *) type_vector,
334 type_vector_length * sizeof (struct type *));
335 memset (&type_vector[old_vector_length], 0,
336 (type_vector_length - old_vector_length) * sizeof (struct type *));
338 return &type_vector[index];
341 /* Make sure there is a type allocated for type number index
342 and return the type object.
343 This can create an empty (zeroed) type object. */
346 coff_alloc_type (int index)
348 struct type **type_addr = coff_lookup_type (index);
349 struct type *type = *type_addr;
351 /* If we are referring to a type not known at all yet,
352 allocate an empty type for it.
353 We will fill it in later if we find out how. */
356 type = alloc_type (coffread_objfile);
362 /* Start a new symtab for a new source file.
363 This is called when a COFF ".file" symbol is seen;
364 it indicates the start of data for one original source file. */
367 coff_start_symtab (struct objfile *objfile, const char *name)
370 start_symtab (objfile,
372 /* We never know the directory name for COFF. */
374 /* The start address is irrelevant, since we call
375 set_last_source_start_addr in coff_end_symtab. */
377 /* Let buildsym.c deduce the language for this symtab. */
379 record_debugformat ("COFF");
382 /* Save the vital information from when starting to read a file,
383 for use when closing off the current file.
384 NAME is the file name the symbols came from, START_ADDR is the
385 first text address for the file, and SIZE is the number of bytes of
389 complete_symtab (const char *name, CORE_ADDR start_addr, unsigned int size)
391 set_last_source_file (name);
392 current_source_start_addr = start_addr;
393 current_source_end_addr = start_addr + size;
396 /* Finish the symbol definitions for one main source file, close off
397 all the lexical contexts for that file (creating struct block's for
398 them), then make the struct symtab for that file and put it in the
402 coff_end_symtab (struct objfile *objfile)
404 set_last_source_start_addr (current_source_start_addr);
406 end_symtab (current_source_end_addr, SECT_OFF_TEXT (objfile));
408 /* Reinitialize for beginning of new file. */
409 set_last_source_file (NULL);
412 /* The linker sometimes generates some non-function symbols inside
413 functions referencing variables imported from another DLL.
414 Return nonzero if the given symbol corresponds to one of them. */
417 is_import_fixup_symbol (struct coff_symbol *cs,
418 enum minimal_symbol_type type)
420 /* The following is a bit of a heuristic using the characterictics
421 of these fixup symbols, but should work well in practice... */
424 /* Must be a non-static text symbol. */
425 if (type != mst_text)
428 /* Must be a non-function symbol. */
429 if (ISFCN (cs->c_type))
432 /* The name must start with "__fu<digits>__". */
433 if (!startswith (cs->c_name, "__fu"))
435 if (! isdigit (cs->c_name[4]))
437 for (i = 5; cs->c_name[i] != '\0' && isdigit (cs->c_name[i]); i++)
438 /* Nothing, just incrementing index past all digits. */;
439 if (cs->c_name[i] != '_' || cs->c_name[i + 1] != '_')
445 static struct minimal_symbol *
446 record_minimal_symbol (minimal_symbol_reader &reader,
447 struct coff_symbol *cs, CORE_ADDR address,
448 enum minimal_symbol_type type, int section,
449 struct objfile *objfile)
451 /* We don't want TDESC entry points in the minimal symbol table. */
452 if (cs->c_name[0] == '@')
455 if (is_import_fixup_symbol (cs, type))
457 /* Because the value of these symbols is within a function code
458 range, these symbols interfere with the symbol-from-address
459 reverse lookup; this manifests itselfs in backtraces, or any
460 other commands that prints symbolic addresses. Just pretend
461 these symbols do not exist. */
465 return reader.record_full (cs->c_name, strlen (cs->c_name), true, address,
469 /* coff_symfile_init ()
470 is the coff-specific initialization routine for reading symbols.
471 It is passed a struct objfile which contains, among other things,
472 the BFD for the file whose symbols are being read, and a slot for
473 a pointer to "private data" which we fill with cookies and other
474 treats for coff_symfile_read ().
476 We will only be called if this is a COFF or COFF-like file. BFD
477 handles figuring out the format of the file, and code in symtab.c
478 uses BFD's determination to vector to us.
480 The ultimate result is a new symtab (or, FIXME, eventually a
484 coff_symfile_init (struct objfile *objfile)
486 /* Allocate struct to keep track of the symfile. */
487 coff_objfile_data_key.emplace (objfile);
489 /* COFF objects may be reordered, so set OBJF_REORDERED. If we
490 find this causes a significant slowdown in gdb then we could
491 set it in the debug symbol readers only when necessary. */
492 objfile->flags |= OBJF_REORDERED;
495 /* This function is called for every section; it finds the outer
496 limits of the line table (minimum and maximum file offset) so that
497 the mainline code can read the whole thing for efficiency. */
500 find_linenos (bfd *abfd, struct bfd_section *asect, void *vpinfo)
502 struct coff_symfile_info *info;
504 file_ptr offset, maxoff;
506 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
507 count = asect->lineno_count;
508 /* End of warning. */
512 size = count * local_linesz;
514 info = (struct coff_symfile_info *) vpinfo;
515 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
516 offset = asect->line_filepos;
517 /* End of warning. */
519 if (offset < info->min_lineno_offset || info->min_lineno_offset == 0)
520 info->min_lineno_offset = offset;
522 maxoff = offset + size;
523 if (maxoff > info->max_lineno_offset)
524 info->max_lineno_offset = maxoff;
528 /* The BFD for this file -- only good while we're actively reading
529 symbols into a psymtab or a symtab. */
531 static bfd *symfile_bfd;
533 /* Read a symbol file, after initialization by coff_symfile_init. */
536 coff_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
538 struct coff_symfile_info *info;
539 bfd *abfd = objfile->obfd;
540 coff_data_type *cdata = coff_data (abfd);
541 char *filename = bfd_get_filename (abfd);
543 unsigned int num_symbols;
545 int stringtab_offset;
548 info = coff_objfile_data_key.get (objfile);
549 symfile_bfd = abfd; /* Kludge for swap routines. */
551 std::vector<asection *> stabsects;
552 scoped_restore restore_stabsects
553 = make_scoped_restore (&info->stabsects, &stabsects);
555 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
556 num_symbols = bfd_get_symcount (abfd); /* How many syms */
557 symtab_offset = cdata->sym_filepos; /* Symbol table file offset */
558 stringtab_offset = symtab_offset + /* String table file offset */
559 num_symbols * cdata->local_symesz;
561 /* Set a few file-statics that give us specific information about
562 the particular COFF file format we're reading. */
563 local_n_btmask = cdata->local_n_btmask;
564 local_n_btshft = cdata->local_n_btshft;
565 local_n_tmask = cdata->local_n_tmask;
566 local_n_tshift = cdata->local_n_tshift;
567 local_linesz = cdata->local_linesz;
568 local_symesz = cdata->local_symesz;
569 local_auxesz = cdata->local_auxesz;
571 /* Allocate space for raw symbol and aux entries, based on their
572 space requirements as reported by BFD. */
573 gdb::def_vector<char> temp_storage (cdata->local_symesz
574 + cdata->local_auxesz);
575 temp_sym = temp_storage.data ();
576 temp_aux = temp_sym + cdata->local_symesz;
578 /* We need to know whether this is a PE file, because in PE files,
579 unlike standard COFF files, symbol values are stored as offsets
580 from the section address, rather than as absolute addresses.
581 FIXME: We should use BFD to read the symbol table, and thus avoid
584 startswith (bfd_get_target (objfile->obfd), "pe")
585 || startswith (bfd_get_target (objfile->obfd), "epoc-pe");
587 /* End of warning. */
589 info->min_lineno_offset = 0;
590 info->max_lineno_offset = 0;
592 /* Only read line number information if we have symbols.
594 On Windows NT, some of the system's DLL's have sections with
595 PointerToLinenumbers fields that are non-zero, but point at
596 random places within the image file. (In the case I found,
597 KERNEL32.DLL's .text section has a line number info pointer that
598 points into the middle of the string `lib\\i386\kernel32.dll'.)
600 However, these DLL's also have no symbols. The line number
601 tables are meaningless without symbols. And in fact, GDB never
602 uses the line number information unless there are symbols. So we
603 can avoid spurious error messages (and maybe run a little
604 faster!) by not even reading the line number table unless we have
606 scoped_restore restore_linetab = make_scoped_restore (&linetab);
607 gdb::unique_xmalloc_ptr<char> linetab_storage;
610 /* Read the line number table, all at once. */
611 bfd_map_over_sections (abfd, find_linenos, (void *) info);
613 val = init_lineno (abfd, info->min_lineno_offset,
614 info->max_lineno_offset - info->min_lineno_offset,
617 error (_("\"%s\": error reading line numbers."), filename);
620 /* Now read the string table, all at once. */
622 scoped_restore restore_stringtab = make_scoped_restore (&stringtab);
623 gdb::unique_xmalloc_ptr<char> stringtab_storage;
624 val = init_stringtab (abfd, stringtab_offset, &stringtab_storage);
626 error (_("\"%s\": can't get string table"), filename);
628 minimal_symbol_reader reader (objfile);
630 /* Now that the executable file is positioned at symbol table,
631 process it and define symbols accordingly. */
633 coff_symtab_read (reader, (long) symtab_offset, num_symbols, objfile);
635 /* Install any minimal symbols that have been collected as the
636 current minimal symbols for this objfile. */
642 for (minimal_symbol *msym : objfile->msymbols ())
644 const char *name = MSYMBOL_LINKAGE_NAME (msym);
646 /* If the minimal symbols whose name are prefixed by "__imp_"
647 or "_imp_", get rid of the prefix, and search the minimal
648 symbol in OBJFILE. Note that 'maintenance print msymbols'
649 shows that type of these "_imp_XXXX" symbols is mst_data. */
650 if (MSYMBOL_TYPE (msym) == mst_data)
652 const char *name1 = NULL;
654 if (startswith (name, "_imp_"))
656 else if (startswith (name, "__imp_"))
660 int lead = bfd_get_symbol_leading_char (objfile->obfd);
661 struct bound_minimal_symbol found;
663 if (lead != '\0' && *name1 == lead)
666 found = lookup_minimal_symbol (name1, NULL, objfile);
668 /* If found, there are symbols named "_imp_foo" and "foo"
669 respectively in OBJFILE. Set the type of symbol "foo"
670 as 'mst_solib_trampoline'. */
671 if (found.minsym != NULL
672 && MSYMBOL_TYPE (found.minsym) == mst_text)
673 MSYMBOL_TYPE (found.minsym) = mst_solib_trampoline;
679 if (!(objfile->flags & OBJF_READNEVER))
680 bfd_map_over_sections (abfd, coff_locate_sections, (void *) info);
682 if (!info->stabsects->empty())
684 if (!info->stabstrsect)
686 error (_("The debugging information in `%s' is corrupted.\nThe "
687 "file has a `.stabs' section, but no `.stabstr' section."),
691 /* FIXME: dubious. Why can't we use something normal like
692 bfd_get_section_contents? */
693 bfd_seek (abfd, abfd->where, 0);
695 stabstrsize = bfd_section_size (abfd, info->stabstrsect);
697 coffstab_build_psymtabs (objfile,
698 info->textaddr, info->textsize,
700 info->stabstrsect->filepos, stabstrsize);
702 if (dwarf2_has_info (objfile, NULL))
704 /* DWARF2 sections. */
705 dwarf2_build_psymtabs (objfile);
708 dwarf2_build_frame_info (objfile);
710 /* Try to add separate debug file if no symbols table found. */
711 if (!objfile_has_partial_symbols (objfile))
713 std::string debugfile = find_separate_debug_file_by_buildid (objfile);
715 if (debugfile.empty ())
716 debugfile = find_separate_debug_file_by_debuglink (objfile);
718 if (!debugfile.empty ())
720 gdb_bfd_ref_ptr debug_bfd (symfile_bfd_open (debugfile.c_str ()));
722 symbol_file_add_separate (debug_bfd.get (), debugfile.c_str (),
723 symfile_flags, objfile);
729 coff_new_init (struct objfile *ignore)
733 /* Perform any local cleanups required when we are done with a
734 particular objfile. I.E, we are in the process of discarding all
735 symbol information for an objfile, freeing up all memory held for
736 it, and unlinking the objfile struct from the global list of known
740 coff_symfile_finish (struct objfile *objfile)
742 /* Let stabs reader clean up. */
743 stabsread_clear_cache ();
747 /* Given pointers to a symbol table in coff style exec file,
748 analyze them and create struct symtab's describing the symbols.
749 NSYMS is the number of symbols in the symbol table.
750 We read them one at a time using read_one_sym (). */
753 coff_symtab_read (minimal_symbol_reader &reader,
754 long symtab_offset, unsigned int nsyms,
755 struct objfile *objfile)
757 struct gdbarch *gdbarch = get_objfile_arch (objfile);
758 struct context_stack *newobj = nullptr;
759 struct coff_symbol coff_symbol;
760 struct coff_symbol *cs = &coff_symbol;
761 static struct internal_syment main_sym;
762 static union internal_auxent main_aux;
763 struct coff_symbol fcn_cs_saved;
764 static struct internal_syment fcn_sym_saved;
765 static union internal_auxent fcn_aux_saved;
766 /* A .file is open. */
767 int in_source_file = 0;
768 int next_file_symnum = -1;
769 /* Name of the current file. */
770 const char *filestring = "";
772 int fcn_first_line = 0;
773 CORE_ADDR fcn_first_line_addr = 0;
774 int fcn_last_line = 0;
775 int fcn_start_addr = 0;
776 long fcn_line_ptr = 0;
779 struct minimal_symbol *msym;
781 scoped_free_pendings free_pending;
783 /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous....
784 it's hard to know I've really worked around it. The fix should
785 be harmless, anyway). The symptom of the bug is that the first
786 fread (in read_one_sym), will (in my example) actually get data
787 from file offset 268, when the fseek was to 264 (and ftell shows
788 264). This causes all hell to break loose. I was unable to
789 reproduce this on a short test program which operated on the same
790 file, performing (I think) the same sequence of operations.
792 It stopped happening when I put in this (former) rewind().
794 FIXME: Find out if this has been reported to Sun, whether it has
795 been fixed in a later release, etc. */
797 bfd_seek (objfile->obfd, 0, 0);
799 /* Position to read the symbol table. */
800 val = bfd_seek (objfile->obfd, (long) symtab_offset, 0);
802 perror_with_name (objfile_name (objfile));
804 coffread_objfile = objfile;
805 nlist_bfd_global = objfile->obfd;
806 nlist_nsyms_global = nsyms;
807 set_last_source_file (NULL);
808 memset (opaque_type_chain, 0, sizeof opaque_type_chain);
810 if (type_vector) /* Get rid of previous one. */
812 type_vector_length = INITIAL_TYPE_VECTOR_LENGTH;
813 type_vector = XCNEWVEC (struct type *, type_vector_length);
815 coff_start_symtab (objfile, "");
818 while (symnum < nsyms)
820 QUIT; /* Make this command interruptable. */
822 read_one_sym (cs, &main_sym, &main_aux);
824 if (cs->c_symnum == next_file_symnum && cs->c_sclass != C_FILE)
826 if (get_last_source_file ())
827 coff_end_symtab (objfile);
829 coff_start_symtab (objfile, "_globals_");
830 /* coff_start_symtab will set the language of this symtab to
831 language_unknown, since such a ``file name'' is not
832 recognized. Override that with the minimal language to
833 allow printing values in this symtab. */
834 get_current_subfile ()->language = language_minimal;
835 complete_symtab ("_globals_", 0, 0);
836 /* Done with all files, everything from here on out is
840 /* Special case for file with type declarations only, no
842 if (!get_last_source_file () && SDB_TYPE (cs->c_type)
843 && cs->c_secnum == N_DEBUG)
844 complete_symtab (filestring, 0, 0);
846 /* Typedefs should not be treated as symbol definitions. */
847 if (ISFCN (cs->c_type) && cs->c_sclass != C_TPDEF)
849 /* Record all functions -- external and static -- in
851 int section = cs_to_section (cs, objfile);
853 tmpaddr = cs->c_value;
854 /* Don't record unresolved symbols. */
855 if (!(cs->c_secnum <= 0 && cs->c_value == 0))
856 record_minimal_symbol (reader, cs, tmpaddr, mst_text,
859 fcn_line_ptr = main_aux.x_sym.x_fcnary.x_fcn.x_lnnoptr;
860 fcn_start_addr = tmpaddr;
862 fcn_sym_saved = main_sym;
863 fcn_aux_saved = main_aux;
867 switch (cs->c_sclass)
876 complaint (_("Bad n_sclass for symbol %s"),
881 /* c_value field contains symnum of next .file entry in
882 table or symnum of first global after last .file. */
883 next_file_symnum = cs->c_value;
885 filestring = coff_getfilename (&main_aux);
889 /* Complete symbol table for last object file
890 containing debugging information. */
891 if (get_last_source_file ())
893 coff_end_symtab (objfile);
894 coff_start_symtab (objfile, filestring);
899 /* C_LABEL is used for labels and static functions.
900 Including it here allows gdb to see static functions when
901 no debug info is available. */
903 /* However, labels within a function can make weird
904 backtraces, so filter them out (from phdm@macqel.be). */
911 case C_THUMBSTATFUNC:
912 if (cs->c_name[0] == '.')
914 if (strcmp (cs->c_name, ".text") == 0)
916 /* FIXME: don't wire in ".text" as section name or
918 /* Check for in_source_file deals with case of a
919 file with debugging symbols followed by a later
920 file with no symbols. */
922 complete_symtab (filestring,
923 cs->c_value + ANOFFSET (objfile->section_offsets,
924 SECT_OFF_TEXT (objfile)),
925 main_aux.x_scn.x_scnlen);
928 /* Flush rest of '.' symbols. */
931 else if (!SDB_TYPE (cs->c_type)
932 && cs->c_name[0] == 'L'
933 && (startswith (cs->c_name, "LI%")
934 || startswith (cs->c_name, "LF%")
935 || startswith (cs->c_name, "LC%")
936 || startswith (cs->c_name, "LP%")
937 || startswith (cs->c_name, "LPB%")
938 || startswith (cs->c_name, "LBB%")
939 || startswith (cs->c_name, "LBE%")
940 || startswith (cs->c_name, "LPBX%")))
941 /* At least on a 3b1, gcc generates swbeg and string labels
942 that look like this. Ignore them. */
944 /* For static symbols that don't start with '.'... */
950 /* Record it in the minimal symbols regardless of
951 SDB_TYPE. This parallels what we do for other debug
952 formats, and probably is needed to make
953 print_address_symbolic work right without the (now
954 gone) "set fast-symbolic-addr off" kludge. */
956 enum minimal_symbol_type ms_type;
958 CORE_ADDR offset = 0;
960 if (cs->c_secnum == N_UNDEF)
962 /* This is a common symbol. We used to rely on
963 the target to tell us whether it knows where
964 the symbol has been relocated to, but none of
965 the target implementations actually provided
966 that operation. So we just ignore the symbol,
967 the same way we would do if we had a target-side
968 symbol lookup which returned no match. */
971 else if (cs->c_secnum == N_ABS)
973 /* Use the correct minimal symbol type (and don't
974 relocate) for absolute values. */
976 sec = cs_to_section (cs, objfile);
977 tmpaddr = cs->c_value;
981 asection *bfd_section = cs_to_bfd_section (cs, objfile);
983 sec = cs_to_section (cs, objfile);
984 tmpaddr = cs->c_value;
985 /* Statics in a PE file also get relocated. */
986 if (cs->c_sclass == C_EXT
987 || cs->c_sclass == C_THUMBEXTFUNC
988 || cs->c_sclass == C_THUMBEXT
989 || (pe_file && (cs->c_sclass == C_STAT)))
990 offset = ANOFFSET (objfile->section_offsets, sec);
992 if (bfd_section->flags & SEC_CODE)
995 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC
996 || cs->c_sclass == C_THUMBEXT ?
997 mst_text : mst_file_text;
998 tmpaddr = gdbarch_addr_bits_remove (gdbarch, tmpaddr);
1000 else if (bfd_section->flags & SEC_ALLOC
1001 && bfd_section->flags & SEC_LOAD)
1004 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1005 ? mst_data : mst_file_data;
1007 else if (bfd_section->flags & SEC_ALLOC)
1010 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1011 ? mst_bss : mst_file_bss;
1014 ms_type = mst_unknown;
1017 msym = record_minimal_symbol (reader, cs, tmpaddr, ms_type,
1020 gdbarch_coff_make_msymbol_special (gdbarch,
1021 cs->c_sclass, msym);
1023 if (SDB_TYPE (cs->c_type))
1027 sym = process_coff_symbol
1028 (cs, &main_aux, objfile);
1029 SYMBOL_VALUE (sym) = tmpaddr + offset;
1030 SYMBOL_SECTION (sym) = sec;
1036 if (strcmp (cs->c_name, ".bf") == 0)
1038 within_function = 1;
1040 /* Value contains address of first non-init type
1042 /* main_aux.x_sym.x_misc.x_lnsz.x_lnno
1043 contains line number of '{' }. */
1044 if (cs->c_naux != 1)
1045 complaint (_("`.bf' symbol %d has no aux entry"),
1047 fcn_first_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1048 fcn_first_line_addr = cs->c_value;
1050 /* Might want to check that locals are 0 and
1051 context_stack_depth is zero, and complain if not. */
1054 newobj = push_context (depth, fcn_start_addr);
1055 fcn_cs_saved.c_name = getsymname (&fcn_sym_saved);
1057 process_coff_symbol (&fcn_cs_saved,
1058 &fcn_aux_saved, objfile);
1060 else if (strcmp (cs->c_name, ".ef") == 0)
1062 if (!within_function)
1063 error (_("Bad coff function information."));
1064 /* The value of .ef is the address of epilogue code;
1065 not useful for gdb. */
1066 /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
1067 contains number of lines to '}' */
1069 if (outermost_context_p ())
1070 { /* We attempted to pop an empty context stack. */
1071 complaint (_("`.ef' symbol without matching `.bf' "
1072 "symbol ignored starting at symnum %d"),
1074 within_function = 0;
1078 struct context_stack cstk = pop_context ();
1079 /* Stack must be empty now. */
1080 if (!outermost_context_p () || newobj == NULL)
1082 complaint (_("Unmatched .ef symbol(s) ignored "
1083 "starting at symnum %d"),
1085 within_function = 0;
1088 if (cs->c_naux != 1)
1090 complaint (_("`.ef' symbol %d has no aux entry"),
1092 fcn_last_line = 0x7FFFFFFF;
1096 fcn_last_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1098 /* fcn_first_line is the line number of the opening '{'.
1099 Do not record it - because it would affect gdb's idea
1100 of the line number of the first statement of the
1101 function - except for one-line functions, for which
1102 it is also the line number of all the statements and
1103 of the closing '}', and for which we do not have any
1104 other statement-line-number. */
1105 if (fcn_last_line == 1)
1106 record_line (get_current_subfile (), fcn_first_line,
1107 gdbarch_addr_bits_remove (gdbarch,
1108 fcn_first_line_addr));
1110 enter_linenos (fcn_line_ptr, fcn_first_line,
1111 fcn_last_line, objfile);
1113 finish_block (cstk.name, cstk.old_blocks,
1114 NULL, cstk.start_addr,
1115 fcn_cs_saved.c_value
1116 + fcn_aux_saved.x_sym.x_misc.x_fsize
1117 + ANOFFSET (objfile->section_offsets,
1118 SECT_OFF_TEXT (objfile)));
1119 within_function = 0;
1124 if (strcmp (cs->c_name, ".bb") == 0)
1126 tmpaddr = cs->c_value;
1127 tmpaddr += ANOFFSET (objfile->section_offsets,
1128 SECT_OFF_TEXT (objfile));
1129 push_context (++depth, tmpaddr);
1131 else if (strcmp (cs->c_name, ".eb") == 0)
1133 if (outermost_context_p ())
1134 { /* We attempted to pop an empty context stack. */
1135 complaint (_("`.eb' symbol without matching `.bb' "
1136 "symbol ignored starting at symnum %d"),
1141 struct context_stack cstk = pop_context ();
1142 if (depth-- != cstk.depth)
1144 complaint (_("Mismatched .eb symbol ignored "
1145 "starting at symnum %d"),
1149 if (*get_local_symbols () && !outermost_context_p ())
1152 cs->c_value + ANOFFSET (objfile->section_offsets,
1153 SECT_OFF_TEXT (objfile));
1154 /* Make a block for the local symbols within. */
1155 finish_block (0, cstk.old_blocks, NULL,
1156 cstk.start_addr, tmpaddr);
1158 /* Now pop locals of block just finished. */
1159 *get_local_symbols () = cstk.locals;
1164 process_coff_symbol (cs, &main_aux, objfile);
1169 if ((nsyms == 0) && (pe_file))
1171 /* We've got no debugging symbols, but it's a portable
1172 executable, so try to read the export table. */
1173 read_pe_exported_syms (reader, objfile);
1176 if (get_last_source_file ())
1177 coff_end_symtab (objfile);
1179 /* Patch up any opaque types (references to types that are not defined
1180 in the file where they are referenced, e.g. "struct foo *bar"). */
1182 for (compunit_symtab *cu : objfile->compunits ())
1184 for (symtab *s : compunit_filetabs (cu))
1185 patch_opaque_types (s);
1189 coffread_objfile = NULL;
1192 /* Routines for reading headers and symbols from executable. */
1194 /* Read the next symbol, swap it, and return it in both
1195 internal_syment form, and coff_symbol form. Also return its first
1196 auxent, if any, in internal_auxent form, and skip any other
1200 read_one_sym (struct coff_symbol *cs,
1201 struct internal_syment *sym,
1202 union internal_auxent *aux)
1205 bfd_size_type bytes;
1207 cs->c_symnum = symnum;
1208 bytes = bfd_bread (temp_sym, local_symesz, nlist_bfd_global);
1209 if (bytes != local_symesz)
1210 error (_("%s: error reading symbols"), objfile_name (coffread_objfile));
1211 bfd_coff_swap_sym_in (symfile_bfd, temp_sym, (char *) sym);
1212 cs->c_naux = sym->n_numaux & 0xff;
1213 if (cs->c_naux >= 1)
1215 bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1216 if (bytes != local_auxesz)
1217 error (_("%s: error reading symbols"), objfile_name (coffread_objfile));
1218 bfd_coff_swap_aux_in (symfile_bfd, temp_aux,
1219 sym->n_type, sym->n_sclass,
1220 0, cs->c_naux, (char *) aux);
1221 /* If more than one aux entry, read past it (only the first aux
1223 for (i = 1; i < cs->c_naux; i++)
1225 bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1226 if (bytes != local_auxesz)
1227 error (_("%s: error reading symbols"),
1228 objfile_name (coffread_objfile));
1231 cs->c_name = getsymname (sym);
1232 cs->c_value = sym->n_value;
1233 cs->c_sclass = (sym->n_sclass & 0xff);
1234 cs->c_secnum = sym->n_scnum;
1235 cs->c_type = (unsigned) sym->n_type;
1236 if (!SDB_TYPE (cs->c_type))
1240 if (cs->c_sclass & 128)
1241 printf (_("thumb symbol %s, class 0x%x\n"), cs->c_name, cs->c_sclass);
1244 symnum += 1 + cs->c_naux;
1246 /* The PE file format stores symbol values as offsets within the
1247 section, rather than as absolute addresses. We correct that
1248 here, if the symbol has an appropriate storage class. FIXME: We
1249 should use BFD to read the symbols, rather than duplicating the
1253 switch (cs->c_sclass)
1257 case C_THUMBEXTFUNC:
1262 case C_THUMBSTATFUNC:
1268 if (cs->c_secnum != 0)
1269 cs->c_value += cs_section_address (cs, symfile_bfd);
1275 /* Support for string table handling. */
1278 init_stringtab (bfd *abfd, long offset, gdb::unique_xmalloc_ptr<char> *storage)
1282 unsigned char lengthbuf[4];
1284 /* If the file is stripped, the offset might be zero, indicating no
1285 string table. Just return with `stringtab' set to null. */
1289 if (bfd_seek (abfd, offset, 0) < 0)
1292 val = bfd_bread ((char *) lengthbuf, sizeof lengthbuf, abfd);
1293 length = bfd_h_get_32 (symfile_bfd, lengthbuf);
1295 /* If no string table is needed, then the file may end immediately
1296 after the symbols. Just return with `stringtab' set to null. */
1297 if (val != sizeof lengthbuf || length < sizeof lengthbuf)
1300 storage->reset ((char *) xmalloc (length));
1301 stringtab = storage->get ();
1302 /* This is in target format (probably not very useful, and not
1303 currently used), not host format. */
1304 memcpy (stringtab, lengthbuf, sizeof lengthbuf);
1305 if (length == sizeof length) /* Empty table -- just the count. */
1308 val = bfd_bread (stringtab + sizeof lengthbuf,
1309 length - sizeof lengthbuf, abfd);
1310 if (val != length - sizeof lengthbuf || stringtab[length - 1] != '\0')
1317 getsymname (struct internal_syment *symbol_entry)
1319 static char buffer[SYMNMLEN + 1];
1322 if (symbol_entry->_n._n_n._n_zeroes == 0)
1324 /* FIXME: Probably should be detecting corrupt symbol files by
1325 seeing whether offset points to within the stringtab. */
1326 result = stringtab + symbol_entry->_n._n_n._n_offset;
1330 strncpy (buffer, symbol_entry->_n._n_name, SYMNMLEN);
1331 buffer[SYMNMLEN] = '\0';
1337 /* Extract the file name from the aux entry of a C_FILE symbol.
1338 Return only the last component of the name. Result is in static
1339 storage and is only good for temporary use. */
1342 coff_getfilename (union internal_auxent *aux_entry)
1344 static char buffer[BUFSIZ];
1347 if (aux_entry->x_file.x_n.x_zeroes == 0)
1349 if (strlen (stringtab + aux_entry->x_file.x_n.x_offset) >= BUFSIZ)
1350 internal_error (__FILE__, __LINE__, _("coff file name too long"));
1351 strcpy (buffer, stringtab + aux_entry->x_file.x_n.x_offset);
1355 strncpy (buffer, aux_entry->x_file.x_fname, FILNMLEN);
1356 buffer[FILNMLEN] = '\0';
1360 /* FIXME: We should not be throwing away the information about what
1361 directory. It should go into dirname of the symtab, or some such
1363 result = lbasename (result);
1367 /* Support for line number handling. */
1369 /* Read in all the line numbers for fast lookups later. Leave them in
1370 external (unswapped) format in memory; we'll swap them as we enter
1371 them into GDB's data structures. */
1374 init_lineno (bfd *abfd, long offset, int size,
1375 gdb::unique_xmalloc_ptr<char> *storage)
1379 linetab_offset = offset;
1380 linetab_size = size;
1385 if (bfd_seek (abfd, offset, 0) < 0)
1388 /* Allocate the desired table, plus a sentinel. */
1389 storage->reset ((char *) xmalloc (size + local_linesz));
1390 linetab = storage->get ();
1392 val = bfd_bread (storage->get (), size, abfd);
1396 /* Terminate it with an all-zero sentinel record. */
1397 memset (linetab + size, 0, local_linesz);
1402 #if !defined (L_LNNO32)
1403 #define L_LNNO32(lp) ((lp)->l_lnno)
1407 enter_linenos (long file_offset, int first_line,
1408 int last_line, struct objfile *objfile)
1410 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1412 struct internal_lineno lptr;
1416 if (file_offset < linetab_offset)
1418 complaint (_("Line number pointer %ld lower than start of line numbers"),
1420 if (file_offset > linetab_size) /* Too big to be an offset? */
1422 file_offset += linetab_offset; /* Try reading at that linetab
1426 rawptr = &linetab[file_offset - linetab_offset];
1428 /* Skip first line entry for each function. */
1429 rawptr += local_linesz;
1430 /* Line numbers start at one for the first line of the function. */
1433 /* If the line number table is full (e.g. 64K lines in COFF debug
1434 info), the next function's L_LNNO32 might not be zero, so don't
1435 overstep the table's end in any case. */
1436 while (rawptr <= &linetab[0] + linetab_size)
1438 bfd_coff_swap_lineno_in (symfile_bfd, rawptr, &lptr);
1439 rawptr += local_linesz;
1440 /* The next function, or the sentinel, will have L_LNNO32 zero;
1442 if (L_LNNO32 (&lptr) && L_LNNO32 (&lptr) <= last_line)
1444 CORE_ADDR addr = lptr.l_addr.l_paddr;
1445 addr += ANOFFSET (objfile->section_offsets,
1446 SECT_OFF_TEXT (objfile));
1447 record_line (get_current_subfile (),
1448 first_line + L_LNNO32 (&lptr),
1449 gdbarch_addr_bits_remove (gdbarch, addr));
1457 patch_type (struct type *type, struct type *real_type)
1459 struct type *target = TYPE_TARGET_TYPE (type);
1460 struct type *real_target = TYPE_TARGET_TYPE (real_type);
1461 int field_size = TYPE_NFIELDS (real_target) * sizeof (struct field);
1463 TYPE_LENGTH (target) = TYPE_LENGTH (real_target);
1464 TYPE_NFIELDS (target) = TYPE_NFIELDS (real_target);
1465 TYPE_FIELDS (target) = (struct field *) TYPE_ALLOC (target,
1468 memcpy (TYPE_FIELDS (target),
1469 TYPE_FIELDS (real_target),
1472 if (TYPE_NAME (real_target))
1474 /* The previous copy of TYPE_NAME is allocated by
1475 process_coff_symbol. */
1476 if (TYPE_NAME (target))
1477 xfree ((char*) TYPE_NAME (target));
1478 TYPE_NAME (target) = xstrdup (TYPE_NAME (real_target));
1482 /* Patch up all appropriate typedef symbols in the opaque_type_chains
1483 so that they can be used to print out opaque data structures
1487 patch_opaque_types (struct symtab *s)
1489 const struct block *b;
1490 struct block_iterator iter;
1491 struct symbol *real_sym;
1493 /* Go through the per-file symbols only. */
1494 b = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (s), STATIC_BLOCK);
1495 ALL_BLOCK_SYMBOLS (b, iter, real_sym)
1497 /* Find completed typedefs to use to fix opaque ones.
1498 Remove syms from the chain when their types are stored,
1499 but search the whole chain, as there may be several syms
1500 from different files with the same name. */
1501 if (SYMBOL_CLASS (real_sym) == LOC_TYPEDEF
1502 && SYMBOL_DOMAIN (real_sym) == VAR_DOMAIN
1503 && TYPE_CODE (SYMBOL_TYPE (real_sym)) == TYPE_CODE_PTR
1504 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym))) != 0)
1506 const char *name = SYMBOL_LINKAGE_NAME (real_sym);
1507 int hash = hashname (name);
1508 struct symbol *sym, *prev;
1511 for (sym = opaque_type_chain[hash]; sym;)
1513 if (name[0] == SYMBOL_LINKAGE_NAME (sym)[0]
1514 && strcmp (name + 1, SYMBOL_LINKAGE_NAME (sym) + 1) == 0)
1518 SYMBOL_VALUE_CHAIN (prev) = SYMBOL_VALUE_CHAIN (sym);
1522 opaque_type_chain[hash] = SYMBOL_VALUE_CHAIN (sym);
1525 patch_type (SYMBOL_TYPE (sym), SYMBOL_TYPE (real_sym));
1529 sym = SYMBOL_VALUE_CHAIN (prev);
1533 sym = opaque_type_chain[hash];
1539 sym = SYMBOL_VALUE_CHAIN (sym);
1547 coff_reg_to_regnum (struct symbol *sym, struct gdbarch *gdbarch)
1549 return gdbarch_sdb_reg_to_regnum (gdbarch, SYMBOL_VALUE (sym));
1552 static const struct symbol_register_ops coff_register_funcs = {
1556 /* The "aclass" index for computed COFF symbols. */
1558 static int coff_register_index;
1560 static struct symbol *
1561 process_coff_symbol (struct coff_symbol *cs,
1562 union internal_auxent *aux,
1563 struct objfile *objfile)
1565 struct symbol *sym = allocate_symbol (objfile);
1569 name = EXTERNAL_NAME (name, objfile->obfd);
1570 SYMBOL_SET_LANGUAGE (sym, get_current_subfile ()->language,
1571 &objfile->objfile_obstack);
1572 SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile);
1574 /* default assumptions */
1575 SYMBOL_VALUE (sym) = cs->c_value;
1576 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1577 SYMBOL_SECTION (sym) = cs_to_section (cs, objfile);
1579 if (ISFCN (cs->c_type))
1581 SYMBOL_VALUE (sym) += ANOFFSET (objfile->section_offsets,
1582 SECT_OFF_TEXT (objfile));
1584 lookup_function_type (decode_function_type (cs, cs->c_type,
1587 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
1588 if (cs->c_sclass == C_STAT || cs->c_sclass == C_THUMBSTAT
1589 || cs->c_sclass == C_THUMBSTATFUNC)
1590 add_symbol_to_list (sym, get_file_symbols ());
1591 else if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1592 || cs->c_sclass == C_THUMBEXTFUNC)
1593 add_symbol_to_list (sym, get_global_symbols ());
1597 SYMBOL_TYPE (sym) = decode_type (cs, cs->c_type, aux, objfile);
1598 switch (cs->c_sclass)
1604 SYMBOL_ACLASS_INDEX (sym) = LOC_LOCAL;
1605 add_symbol_to_list (sym, get_local_symbols ());
1609 case C_THUMBEXTFUNC:
1611 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
1612 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1613 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
1614 SECT_OFF_TEXT (objfile));
1615 add_symbol_to_list (sym, get_global_symbols ());
1619 case C_THUMBSTATFUNC:
1621 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
1622 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1623 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
1624 SECT_OFF_TEXT (objfile));
1625 if (within_function)
1627 /* Static symbol of local scope. */
1628 add_symbol_to_list (sym, get_local_symbols ());
1632 /* Static symbol at top level of file. */
1633 add_symbol_to_list (sym, get_file_symbols ());
1637 #ifdef C_GLBLREG /* AMD coff */
1641 SYMBOL_ACLASS_INDEX (sym) = coff_register_index;
1642 SYMBOL_VALUE (sym) = cs->c_value;
1643 add_symbol_to_list (sym, get_local_symbols ());
1651 SYMBOL_ACLASS_INDEX (sym) = LOC_ARG;
1652 SYMBOL_IS_ARGUMENT (sym) = 1;
1653 add_symbol_to_list (sym, get_local_symbols ());
1657 SYMBOL_ACLASS_INDEX (sym) = coff_register_index;
1658 SYMBOL_IS_ARGUMENT (sym) = 1;
1659 SYMBOL_VALUE (sym) = cs->c_value;
1660 add_symbol_to_list (sym, get_local_symbols ());
1664 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
1665 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1667 /* If type has no name, give it one. */
1668 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
1670 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1671 || TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_FUNC)
1673 /* If we are giving a name to a type such as
1674 "pointer to foo" or "function returning foo", we
1675 better not set the TYPE_NAME. If the program
1676 contains "typedef char *caddr_t;", we don't want
1677 all variables of type char * to print as caddr_t.
1678 This is not just a consequence of GDB's type
1679 management; CC and GCC (at least through version
1680 2.4) both output variables of either type char *
1681 or caddr_t with the type refering to the C_TPDEF
1682 symbol for caddr_t. If a future compiler cleans
1683 this up it GDB is not ready for it yet, but if it
1684 becomes ready we somehow need to disable this
1685 check (without breaking the PCC/GCC2.4 case).
1689 Fortunately, this check seems not to be necessary
1690 for anything except pointers or functions. */
1694 TYPE_NAME (SYMBOL_TYPE (sym)) =
1695 xstrdup (SYMBOL_LINKAGE_NAME (sym));
1698 /* Keep track of any type which points to empty structured
1699 type, so it can be filled from a definition from another
1700 file. A simple forward reference (TYPE_CODE_UNDEF) is
1701 not an empty structured type, though; the forward
1702 references work themselves out via the magic of
1703 coff_lookup_type. */
1704 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1705 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym))) == 0
1706 && TYPE_CODE (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)))
1709 int i = hashname (SYMBOL_LINKAGE_NAME (sym));
1711 SYMBOL_VALUE_CHAIN (sym) = opaque_type_chain[i];
1712 opaque_type_chain[i] = sym;
1714 add_symbol_to_list (sym, get_file_symbols ());
1720 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
1721 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
1723 /* Some compilers try to be helpful by inventing "fake"
1724 names for anonymous enums, structures, and unions, like
1725 "~0fake" or ".0fake". Thanks, but no thanks... */
1726 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
1727 if (SYMBOL_LINKAGE_NAME (sym) != NULL
1728 && *SYMBOL_LINKAGE_NAME (sym) != '~'
1729 && *SYMBOL_LINKAGE_NAME (sym) != '.')
1730 TYPE_NAME (SYMBOL_TYPE (sym)) =
1731 xstrdup (SYMBOL_LINKAGE_NAME (sym));
1733 add_symbol_to_list (sym, get_file_symbols ());
1743 /* Decode a coff type specifier; return the type that is meant. */
1745 static struct type *
1746 decode_type (struct coff_symbol *cs, unsigned int c_type,
1747 union internal_auxent *aux, struct objfile *objfile)
1749 struct type *type = 0;
1750 unsigned int new_c_type;
1752 if (c_type & ~N_BTMASK)
1754 new_c_type = DECREF (c_type);
1757 type = decode_type (cs, new_c_type, aux, objfile);
1758 type = lookup_pointer_type (type);
1760 else if (ISFCN (c_type))
1762 type = decode_type (cs, new_c_type, aux, objfile);
1763 type = lookup_function_type (type);
1765 else if (ISARY (c_type))
1768 unsigned short *dim;
1769 struct type *base_type, *index_type, *range_type;
1771 /* Define an array type. */
1772 /* auxent refers to array, not base type. */
1773 if (aux->x_sym.x_tagndx.l == 0)
1776 /* Shift the indices down. */
1777 dim = &aux->x_sym.x_fcnary.x_ary.x_dimen[0];
1780 for (i = 0; *dim && i < DIMNUM - 1; i++, dim++)
1784 base_type = decode_type (cs, new_c_type, aux, objfile);
1785 index_type = objfile_type (objfile)->builtin_int;
1787 = create_static_range_type (NULL, index_type, 0, n - 1);
1789 create_array_type (NULL, base_type, range_type);
1794 /* Reference to existing type. This only occurs with the struct,
1795 union, and enum types. EPI a29k coff fakes us out by producing
1796 aux entries with a nonzero x_tagndx for definitions of structs,
1797 unions, and enums, so we have to check the c_sclass field. SCO
1798 3.2v4 cc gets confused with pointers to pointers to defined
1799 structs, and generates negative x_tagndx fields. */
1800 if (cs->c_naux > 0 && aux->x_sym.x_tagndx.l != 0)
1802 if (cs->c_sclass != C_STRTAG
1803 && cs->c_sclass != C_UNTAG
1804 && cs->c_sclass != C_ENTAG
1805 && aux->x_sym.x_tagndx.l >= 0)
1807 type = coff_alloc_type (aux->x_sym.x_tagndx.l);
1812 complaint (_("Symbol table entry for %s has bad tagndx value"),
1814 /* And fall through to decode_base_type... */
1818 return decode_base_type (cs, BTYPE (c_type), aux, objfile);
1821 /* Decode a coff type specifier for function definition;
1822 return the type that the function returns. */
1824 static struct type *
1825 decode_function_type (struct coff_symbol *cs,
1826 unsigned int c_type,
1827 union internal_auxent *aux,
1828 struct objfile *objfile)
1830 if (aux->x_sym.x_tagndx.l == 0)
1831 cs->c_naux = 0; /* auxent refers to function, not base
1834 return decode_type (cs, DECREF (c_type), aux, objfile);
1837 /* Basic C types. */
1839 static struct type *
1840 decode_base_type (struct coff_symbol *cs,
1841 unsigned int c_type,
1842 union internal_auxent *aux,
1843 struct objfile *objfile)
1845 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1851 /* Shows up with "void (*foo)();" structure members. */
1852 return objfile_type (objfile)->builtin_void;
1856 /* Intel 960 COFF has this symbol and meaning. */
1857 return objfile_type (objfile)->builtin_void;
1861 return objfile_type (objfile)->builtin_char;
1864 return objfile_type (objfile)->builtin_short;
1867 return objfile_type (objfile)->builtin_int;
1870 if (cs->c_sclass == C_FIELD
1871 && aux->x_sym.x_misc.x_lnsz.x_size
1872 > gdbarch_long_bit (gdbarch))
1873 return objfile_type (objfile)->builtin_long_long;
1875 return objfile_type (objfile)->builtin_long;
1878 return objfile_type (objfile)->builtin_float;
1881 return objfile_type (objfile)->builtin_double;
1884 return objfile_type (objfile)->builtin_long_double;
1887 if (cs->c_naux != 1)
1889 /* Anonymous structure type. */
1890 type = coff_alloc_type (cs->c_symnum);
1891 TYPE_CODE (type) = TYPE_CODE_STRUCT;
1892 TYPE_NAME (type) = NULL;
1893 INIT_CPLUS_SPECIFIC (type);
1894 TYPE_LENGTH (type) = 0;
1895 TYPE_FIELDS (type) = 0;
1896 TYPE_NFIELDS (type) = 0;
1900 type = coff_read_struct_type (cs->c_symnum,
1901 aux->x_sym.x_misc.x_lnsz.x_size,
1902 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1908 if (cs->c_naux != 1)
1910 /* Anonymous union type. */
1911 type = coff_alloc_type (cs->c_symnum);
1912 TYPE_NAME (type) = NULL;
1913 INIT_CPLUS_SPECIFIC (type);
1914 TYPE_LENGTH (type) = 0;
1915 TYPE_FIELDS (type) = 0;
1916 TYPE_NFIELDS (type) = 0;
1920 type = coff_read_struct_type (cs->c_symnum,
1921 aux->x_sym.x_misc.x_lnsz.x_size,
1922 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1925 TYPE_CODE (type) = TYPE_CODE_UNION;
1929 if (cs->c_naux != 1)
1931 /* Anonymous enum type. */
1932 type = coff_alloc_type (cs->c_symnum);
1933 TYPE_CODE (type) = TYPE_CODE_ENUM;
1934 TYPE_NAME (type) = NULL;
1935 TYPE_LENGTH (type) = 0;
1936 TYPE_FIELDS (type) = 0;
1937 TYPE_NFIELDS (type) = 0;
1941 type = coff_read_enum_type (cs->c_symnum,
1942 aux->x_sym.x_misc.x_lnsz.x_size,
1943 aux->x_sym.x_fcnary.x_fcn.x_endndx.l,
1949 /* Shouldn't show up here. */
1953 return objfile_type (objfile)->builtin_unsigned_char;
1956 return objfile_type (objfile)->builtin_unsigned_short;
1959 return objfile_type (objfile)->builtin_unsigned_int;
1962 if (cs->c_sclass == C_FIELD
1963 && aux->x_sym.x_misc.x_lnsz.x_size
1964 > gdbarch_long_bit (gdbarch))
1965 return objfile_type (objfile)->builtin_unsigned_long_long;
1967 return objfile_type (objfile)->builtin_unsigned_long;
1969 complaint (_("Unexpected type for symbol %s"), cs->c_name);
1970 return objfile_type (objfile)->builtin_void;
1973 /* This page contains subroutines of read_type. */
1975 /* Read the description of a structure (or union type) and return an
1976 object describing the type. */
1978 static struct type *
1979 coff_read_struct_type (int index, int length, int lastsym,
1980 struct objfile *objfile)
1984 struct nextfield *next;
1989 struct nextfield *list = 0;
1990 struct nextfield *newobj;
1994 struct coff_symbol member_sym;
1995 struct coff_symbol *ms = &member_sym;
1996 struct internal_syment sub_sym;
1997 union internal_auxent sub_aux;
2000 type = coff_alloc_type (index);
2001 TYPE_CODE (type) = TYPE_CODE_STRUCT;
2002 INIT_CPLUS_SPECIFIC (type);
2003 TYPE_LENGTH (type) = length;
2005 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2007 read_one_sym (ms, &sub_sym, &sub_aux);
2009 name = EXTERNAL_NAME (name, objfile->obfd);
2011 switch (ms->c_sclass)
2016 /* Get space to record the next field's data. */
2017 newobj = XALLOCA (struct nextfield);
2018 newobj->next = list;
2021 /* Save the data. */
2023 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
2024 name, strlen (name));
2025 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type,
2027 SET_FIELD_BITPOS (list->field, 8 * ms->c_value);
2028 FIELD_BITSIZE (list->field) = 0;
2034 /* Get space to record the next field's data. */
2035 newobj = XALLOCA (struct nextfield);
2036 newobj->next = list;
2039 /* Save the data. */
2041 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
2042 name, strlen (name));
2043 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type,
2045 SET_FIELD_BITPOS (list->field, ms->c_value);
2046 FIELD_BITSIZE (list->field) = sub_aux.x_sym.x_misc.x_lnsz.x_size;
2055 /* Now create the vector of fields, and record how big it is. */
2057 TYPE_NFIELDS (type) = nfields;
2058 TYPE_FIELDS (type) = (struct field *)
2059 TYPE_ALLOC (type, sizeof (struct field) * nfields);
2061 /* Copy the saved-up fields into the field vector. */
2063 for (n = nfields; list; list = list->next)
2064 TYPE_FIELD (type, --n) = list->field;
2069 /* Read a definition of an enumeration type,
2070 and create and return a suitable type object.
2071 Also defines the symbols that represent the values of the type. */
2073 static struct type *
2074 coff_read_enum_type (int index, int length, int lastsym,
2075 struct objfile *objfile)
2077 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2082 struct pending **symlist;
2083 struct coff_symbol member_sym;
2084 struct coff_symbol *ms = &member_sym;
2085 struct internal_syment sub_sym;
2086 union internal_auxent sub_aux;
2087 struct pending *osyms, *syms;
2091 int unsigned_enum = 1;
2093 type = coff_alloc_type (index);
2094 if (within_function)
2095 symlist = get_local_symbols ();
2097 symlist = get_file_symbols ();
2099 o_nsyms = osyms ? osyms->nsyms : 0;
2101 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2103 read_one_sym (ms, &sub_sym, &sub_aux);
2105 name = EXTERNAL_NAME (name, objfile->obfd);
2107 switch (ms->c_sclass)
2110 sym = allocate_symbol (objfile);
2112 name = (char *) obstack_copy0 (&objfile->objfile_obstack, name,
2114 SYMBOL_SET_LINKAGE_NAME (sym, name);
2115 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
2116 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2117 SYMBOL_VALUE (sym) = ms->c_value;
2118 add_symbol_to_list (sym, symlist);
2123 /* Sometimes the linker (on 386/ix 2.0.2 at least) screws
2124 up the count of how many symbols to read. So stop
2131 /* Now fill in the fields of the type-structure. */
2134 TYPE_LENGTH (type) = length;
2135 else /* Assume ints. */
2136 TYPE_LENGTH (type) = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
2137 TYPE_CODE (type) = TYPE_CODE_ENUM;
2138 TYPE_NFIELDS (type) = nsyms;
2139 TYPE_FIELDS (type) = (struct field *)
2140 TYPE_ALLOC (type, sizeof (struct field) * nsyms);
2142 /* Find the symbols for the values and put them into the type.
2143 The symbols can be found in the symlist that we put them on
2144 to cause them to be defined. osyms contains the old value
2145 of that symlist; everything up to there was defined by us. */
2146 /* Note that we preserve the order of the enum constants, so
2147 that in something like "enum {FOO, LAST_THING=FOO}" we print
2148 FOO, not LAST_THING. */
2150 for (syms = *symlist, n = 0; syms; syms = syms->next)
2156 for (; j < syms->nsyms; j++, n++)
2158 struct symbol *xsym = syms->symbol[j];
2160 SYMBOL_TYPE (xsym) = type;
2161 TYPE_FIELD_NAME (type, n) = SYMBOL_LINKAGE_NAME (xsym);
2162 SET_FIELD_ENUMVAL (TYPE_FIELD (type, n), SYMBOL_VALUE (xsym));
2163 if (SYMBOL_VALUE (xsym) < 0)
2165 TYPE_FIELD_BITSIZE (type, n) = 0;
2172 TYPE_UNSIGNED (type) = 1;
2177 /* Register our ability to parse symbols for coff BFD files. */
2179 static const struct sym_fns coff_sym_fns =
2181 coff_new_init, /* sym_new_init: init anything gbl to
2183 coff_symfile_init, /* sym_init: read initial info, setup
2185 coff_symfile_read, /* sym_read: read a symbol file into
2187 NULL, /* sym_read_psymbols */
2188 coff_symfile_finish, /* sym_finish: finished with file,
2190 default_symfile_offsets, /* sym_offsets: xlate external to
2192 default_symfile_segments, /* sym_segments: Get segment
2193 information from a file */
2194 NULL, /* sym_read_linetable */
2196 default_symfile_relocate, /* sym_relocate: Relocate a debug
2198 NULL, /* sym_probe_fns */
2203 _initialize_coffread (void)
2205 add_symtab_fns (bfd_target_coff_flavour, &coff_sym_fns);
2208 = register_symbol_register_impl (LOC_REGISTER, &coff_register_funcs);