1 /* Read coff symbol tables and convert to internal format, for GDB.
2 Copyright 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
3 1997, 1998, 1999, 2000, 2001, 2002, 2003
4 Free Software Foundation, Inc.
5 Contributed by David D. Johnson, Brown University (ddj@cs.brown.edu).
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
28 #include "breakpoint.h"
31 #include "gdb_obstack.h"
33 #include "gdb_string.h"
36 #include "coff/internal.h" /* Internal format of COFF symbols in BFD */
37 #include "libcoff.h" /* FIXME secret internal data from BFD */
42 #include "gdb-stabs.h"
43 #include "stabsread.h"
44 #include "complaints.h"
46 #include "gdb_assert.h"
49 #include "coff-pe-read.h"
51 extern void _initialize_coffread (void);
53 struct coff_symfile_info
55 file_ptr min_lineno_offset; /* Where in file lowest line#s are */
56 file_ptr max_lineno_offset; /* 1+last byte of line#s in file */
58 CORE_ADDR textaddr; /* Addr of .text section. */
59 unsigned int textsize; /* Size of .text section. */
60 struct stab_section_list *stabsects; /* .stab sections. */
61 asection *stabstrsect; /* Section pointer for .stab section */
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)? string+1: string)
69 /* To be an sdb debug type, type must have at least a basic or primary
70 derived type. Using this rather than checking against T_NULL is
71 said to prevent core dumps if we try to operate on Michael Bloom
74 #define SDB_TYPE(type) (BTYPE(type) | (type & N_TMASK))
76 /* Core address of start and end of text of current source file.
77 This comes from a ".text" symbol where x_nlinno > 0. */
79 static CORE_ADDR current_source_start_addr;
80 static CORE_ADDR current_source_end_addr;
82 /* The addresses of the symbol table stream and number of symbols
83 of the object file we are reading (as copied into core). */
85 static bfd *nlist_bfd_global;
86 static int nlist_nsyms_global;
89 /* Pointers to scratch storage, used for reading raw symbols and auxents. */
91 static char *temp_sym;
92 static char *temp_aux;
94 /* Local variables that hold the shift and mask values for the
95 COFF file that we are currently reading. These come back to us
96 from BFD, and are referenced by their macro names, as well as
97 internally to the BTYPE, ISPTR, ISFCN, ISARY, ISTAG, and DECREF
98 macros from include/coff/internal.h . */
100 static unsigned local_n_btmask;
101 static unsigned local_n_btshft;
102 static unsigned local_n_tmask;
103 static unsigned local_n_tshift;
105 #define N_BTMASK local_n_btmask
106 #define N_BTSHFT local_n_btshft
107 #define N_TMASK local_n_tmask
108 #define N_TSHIFT local_n_tshift
110 /* Local variables that hold the sizes in the file of various COFF structures.
111 (We only need to know this to read them from the file -- BFD will then
112 translate the data in them, into `internal_xxx' structs in the right
113 byte order, alignment, etc.) */
115 static unsigned local_linesz;
116 static unsigned local_symesz;
117 static unsigned local_auxesz;
119 /* This is set if this is a PE format file. */
123 /* Chain of typedefs of pointers to empty struct/union types.
124 They are chained thru the SYMBOL_VALUE_CHAIN. */
126 static struct symbol *opaque_type_chain[HASHSIZE];
128 /* Simplified internal version of coff symbol table information */
133 int c_symnum; /* symbol number of this entry */
134 int c_naux; /* 0 if syment only, 1 if syment + auxent, etc */
141 extern void stabsread_clear_cache (void);
143 static struct type *coff_read_struct_type (int, int, int);
145 static struct type *decode_base_type (struct coff_symbol *,
146 unsigned int, union internal_auxent *);
148 static struct type *decode_type (struct coff_symbol *, unsigned int,
149 union internal_auxent *);
151 static struct type *decode_function_type (struct coff_symbol *,
153 union internal_auxent *);
155 static struct type *coff_read_enum_type (int, int, int);
157 static struct symbol *process_coff_symbol (struct coff_symbol *,
158 union internal_auxent *,
161 static void patch_opaque_types (struct symtab *);
163 static void enter_linenos (long, int, int, struct objfile *);
165 static void free_linetab (void);
167 static void free_linetab_cleanup (void *ignore);
169 static int init_lineno (bfd *, long, int);
171 static char *getsymname (struct internal_syment *);
173 static char *coff_getfilename (union internal_auxent *);
175 static void free_stringtab (void);
177 static void free_stringtab_cleanup (void *ignore);
179 static int init_stringtab (bfd *, long);
181 static void read_one_sym (struct coff_symbol *,
182 struct internal_syment *, union internal_auxent *);
184 static void coff_symtab_read (long, unsigned int, struct objfile *);
186 /* We are called once per section from coff_symfile_read. We
187 need to examine each section we are passed, check to see
188 if it is something we are interested in processing, and
189 if so, stash away some access information for the section.
191 FIXME: The section names should not be hardwired strings (what
192 should they be? I don't think most object file formats have enough
193 section flags to specify what kind of debug section it is
197 coff_locate_sections (bfd *abfd, asection *sectp, void *csip)
199 register struct coff_symfile_info *csi;
202 csi = (struct coff_symfile_info *) csip;
203 name = bfd_get_section_name (abfd, sectp);
204 if (STREQ (name, ".text"))
206 csi->textaddr = bfd_section_vma (abfd, sectp);
207 csi->textsize += bfd_section_size (abfd, sectp);
209 else if (strncmp (name, ".text", sizeof ".text" - 1) == 0)
211 csi->textsize += bfd_section_size (abfd, sectp);
213 else if (STREQ (name, ".stabstr"))
215 csi->stabstrsect = sectp;
217 else if (strncmp (name, ".stab", sizeof ".stab" - 1) == 0)
221 /* We can have multiple .stab sections if linked with
223 for (s = name + sizeof ".stab" - 1; *s != '\0'; s++)
228 struct stab_section_list *n, **pn;
230 n = ((struct stab_section_list *)
231 xmalloc (sizeof (struct stab_section_list)));
234 for (pn = &csi->stabsects; *pn != NULL; pn = &(*pn)->next)
238 /* This will be run after coffstab_build_psymtabs is called
239 in coff_symfile_read, at which point we no longer need
241 make_cleanup (xfree, n);
246 /* Return the section_offsets* that CS points to. */
247 static int cs_to_section (struct coff_symbol *, struct objfile *);
249 struct find_targ_sec_arg
256 find_targ_sec (bfd *abfd, asection *sect, void *obj)
258 struct find_targ_sec_arg *args = (struct find_targ_sec_arg *) obj;
259 if (sect->target_index == args->targ_index)
260 *args->resultp = sect;
263 /* Return the section number (SECT_OFF_*) that CS points to. */
265 cs_to_section (struct coff_symbol *cs, struct objfile *objfile)
267 asection *sect = NULL;
268 struct find_targ_sec_arg args;
269 int off = SECT_OFF_TEXT (objfile);
271 args.targ_index = cs->c_secnum;
272 args.resultp = §
273 bfd_map_over_sections (objfile->obfd, find_targ_sec, &args);
276 /* This is the section. Figure out what SECT_OFF_* code it is. */
277 if (bfd_get_section_flags (abfd, sect) & SEC_CODE)
278 off = SECT_OFF_TEXT (objfile);
279 else if (bfd_get_section_flags (abfd, sect) & SEC_LOAD)
280 off = SECT_OFF_DATA (objfile);
282 /* Just return the bfd section index. */
288 /* Return the address of the section of a COFF symbol. */
290 static CORE_ADDR cs_section_address (struct coff_symbol *, bfd *);
293 cs_section_address (struct coff_symbol *cs, bfd *abfd)
295 asection *sect = NULL;
296 struct find_targ_sec_arg args;
299 args.targ_index = cs->c_secnum;
300 args.resultp = §
301 bfd_map_over_sections (abfd, find_targ_sec, &args);
303 addr = bfd_get_section_vma (objfile->obfd, sect);
307 /* Look up a coff type-number index. Return the address of the slot
308 where the type for that index is stored.
309 The type-number is in INDEX.
311 This can be used for finding the type associated with that index
312 or for associating a new type with the index. */
314 static struct type **
315 coff_lookup_type (register int index)
317 if (index >= type_vector_length)
319 int old_vector_length = type_vector_length;
321 type_vector_length *= 2;
322 if (index /* is still */ >= type_vector_length)
323 type_vector_length = index * 2;
325 type_vector = (struct type **)
326 xrealloc ((char *) type_vector,
327 type_vector_length * sizeof (struct type *));
328 memset (&type_vector[old_vector_length], 0,
329 (type_vector_length - old_vector_length) * sizeof (struct type *));
331 return &type_vector[index];
334 /* Make sure there is a type allocated for type number index
335 and return the type object.
336 This can create an empty (zeroed) type object. */
339 coff_alloc_type (int index)
341 register struct type **type_addr = coff_lookup_type (index);
342 register struct type *type = *type_addr;
344 /* If we are referring to a type not known at all yet,
345 allocate an empty type for it.
346 We will fill it in later if we find out how. */
349 type = alloc_type (current_objfile);
355 /* Start a new symtab for a new source file.
356 This is called when a COFF ".file" symbol is seen;
357 it indicates the start of data for one original source file. */
360 coff_start_symtab (char *name)
363 /* We fill in the filename later. start_symtab puts
364 this pointer into last_source_file and we put it in
365 subfiles->name, which end_symtab frees; that's why
366 it must be malloc'd. */
367 savestring (name, strlen (name)),
368 /* We never know the directory name for COFF. */
370 /* The start address is irrelevant, since we set
371 last_source_start_addr in coff_end_symtab. */
373 record_debugformat ("COFF");
376 /* Save the vital information from when starting to read a file,
377 for use when closing off the current file.
378 NAME is the file name the symbols came from, START_ADDR is the first
379 text address for the file, and SIZE is the number of bytes of text. */
382 complete_symtab (char *name, CORE_ADDR start_addr, unsigned int size)
384 if (last_source_file != NULL)
385 xfree (last_source_file);
386 last_source_file = savestring (name, strlen (name));
387 current_source_start_addr = start_addr;
388 current_source_end_addr = start_addr + size;
390 if (current_objfile->ei.entry_point >= current_source_start_addr &&
391 current_objfile->ei.entry_point < current_source_end_addr)
393 current_objfile->ei.entry_file_lowpc = current_source_start_addr;
394 current_objfile->ei.entry_file_highpc = current_source_end_addr;
398 /* Finish the symbol definitions for one main source file,
399 close off all the lexical contexts for that file
400 (creating struct block's for them), then make the
401 struct symtab for that file and put it in the list of all such. */
404 coff_end_symtab (struct objfile *objfile)
406 struct symtab *symtab;
408 last_source_start_addr = current_source_start_addr;
410 symtab = end_symtab (current_source_end_addr, objfile, SECT_OFF_TEXT (objfile));
413 free_named_symtabs (symtab->filename);
415 /* Reinitialize for beginning of new file. */
416 last_source_file = NULL;
420 record_minimal_symbol (char *name, CORE_ADDR address,
421 enum minimal_symbol_type type, struct objfile *objfile)
423 /* We don't want TDESC entry points in the minimal symbol table */
427 prim_record_minimal_symbol (name, address, type, objfile);
430 /* coff_symfile_init ()
431 is the coff-specific initialization routine for reading symbols.
432 It is passed a struct objfile which contains, among other things,
433 the BFD for the file whose symbols are being read, and a slot for
434 a pointer to "private data" which we fill with cookies and other
435 treats for coff_symfile_read ().
437 We will only be called if this is a COFF or COFF-like file.
438 BFD handles figuring out the format of the file, and code in symtab.c
439 uses BFD's determination to vector to us.
441 The ultimate result is a new symtab (or, FIXME, eventually a psymtab). */
444 coff_symfile_init (struct objfile *objfile)
446 /* Allocate struct to keep track of stab reading. */
447 objfile->sym_stab_info = (struct dbx_symfile_info *)
448 xmmalloc (objfile->md, sizeof (struct dbx_symfile_info));
450 memset (objfile->sym_stab_info, 0,
451 sizeof (struct dbx_symfile_info));
453 /* Allocate struct to keep track of the symfile */
454 objfile->sym_private = xmmalloc (objfile->md,
455 sizeof (struct coff_symfile_info));
457 memset (objfile->sym_private, 0, sizeof (struct coff_symfile_info));
459 /* COFF objects may be reordered, so set OBJF_REORDERED. If we
460 find this causes a significant slowdown in gdb then we could
461 set it in the debug symbol readers only when necessary. */
462 objfile->flags |= OBJF_REORDERED;
464 init_entry_point_info (objfile);
467 /* This function is called for every section; it finds the outer limits
468 of the line table (minimum and maximum file offset) so that the
469 mainline code can read the whole thing for efficiency. */
473 find_linenos (bfd *abfd, sec_ptr asect, void *vpinfo)
475 struct coff_symfile_info *info;
477 file_ptr offset, maxoff;
479 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
480 count = asect->lineno_count;
485 size = count * local_linesz;
487 info = (struct coff_symfile_info *) vpinfo;
488 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
489 offset = asect->line_filepos;
492 if (offset < info->min_lineno_offset || info->min_lineno_offset == 0)
493 info->min_lineno_offset = offset;
495 maxoff = offset + size;
496 if (maxoff > info->max_lineno_offset)
497 info->max_lineno_offset = maxoff;
501 /* The BFD for this file -- only good while we're actively reading
502 symbols into a psymtab or a symtab. */
504 static bfd *symfile_bfd;
506 /* Read a symbol file, after initialization by coff_symfile_init. */
510 coff_symfile_read (struct objfile *objfile, int mainline)
512 struct coff_symfile_info *info;
513 struct dbx_symfile_info *dbxinfo;
514 bfd *abfd = objfile->obfd;
515 coff_data_type *cdata = coff_data (abfd);
516 char *name = bfd_get_filename (abfd);
518 unsigned int num_symbols;
520 int stringtab_offset;
521 struct cleanup *back_to;
526 info = (struct coff_symfile_info *) objfile->sym_private;
527 dbxinfo = objfile->sym_stab_info;
528 symfile_bfd = abfd; /* Kludge for swap routines */
530 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
531 num_symbols = bfd_get_symcount (abfd); /* How many syms */
532 symtab_offset = cdata->sym_filepos; /* Symbol table file offset */
533 stringtab_offset = symtab_offset + /* String table file offset */
534 num_symbols * cdata->local_symesz;
536 /* Set a few file-statics that give us specific information about
537 the particular COFF file format we're reading. */
538 local_n_btmask = cdata->local_n_btmask;
539 local_n_btshft = cdata->local_n_btshft;
540 local_n_tmask = cdata->local_n_tmask;
541 local_n_tshift = cdata->local_n_tshift;
542 local_linesz = cdata->local_linesz;
543 local_symesz = cdata->local_symesz;
544 local_auxesz = cdata->local_auxesz;
546 /* Allocate space for raw symbol and aux entries, based on their
547 space requirements as reported by BFD. */
548 temp_sym = (char *) xmalloc
549 (cdata->local_symesz + cdata->local_auxesz);
550 temp_aux = temp_sym + cdata->local_symesz;
551 back_to = make_cleanup (free_current_contents, &temp_sym);
553 /* We need to know whether this is a PE file, because in PE files,
554 unlike standard COFF files, symbol values are stored as offsets
555 from the section address, rather than as absolute addresses.
556 FIXME: We should use BFD to read the symbol table, and thus avoid
559 strncmp (bfd_get_target (objfile->obfd), "pe", 2) == 0
560 || strncmp (bfd_get_target (objfile->obfd), "epoc-pe", 7) == 0;
564 info->min_lineno_offset = 0;
565 info->max_lineno_offset = 0;
567 /* Only read line number information if we have symbols.
569 On Windows NT, some of the system's DLL's have sections with
570 PointerToLinenumbers fields that are non-zero, but point at
571 random places within the image file. (In the case I found,
572 KERNEL32.DLL's .text section has a line number info pointer that
573 points into the middle of the string `lib\\i386\kernel32.dll'.)
575 However, these DLL's also have no symbols. The line number
576 tables are meaningless without symbols. And in fact, GDB never
577 uses the line number information unless there are symbols. So we
578 can avoid spurious error messages (and maybe run a little
579 faster!) by not even reading the line number table unless we have
583 /* Read the line number table, all at once. */
584 bfd_map_over_sections (abfd, find_linenos, (void *) info);
586 make_cleanup (free_linetab_cleanup, 0 /*ignore*/);
587 val = init_lineno (abfd, info->min_lineno_offset,
588 info->max_lineno_offset - info->min_lineno_offset);
590 error ("\"%s\": error reading line numbers\n", name);
593 /* Now read the string table, all at once. */
595 make_cleanup (free_stringtab_cleanup, 0 /*ignore*/);
596 val = init_stringtab (abfd, stringtab_offset);
598 error ("\"%s\": can't get string table", name);
600 init_minimal_symbol_collection ();
601 make_cleanup_discard_minimal_symbols ();
603 /* Now that the executable file is positioned at symbol table,
604 process it and define symbols accordingly. */
606 coff_symtab_read ((long) symtab_offset, num_symbols, objfile);
608 /* Sort symbols alphabetically within each block. */
613 for (s = objfile->symtabs; s != NULL; s = s->next)
614 sort_symtab_syms (s);
617 /* Install any minimal symbols that have been collected as the current
618 minimal symbols for this objfile. */
620 install_minimal_symbols (objfile);
622 bfd_map_over_sections (abfd, coff_locate_sections, (void *) info);
626 if (!info->stabstrsect)
628 error (("The debugging information in `%s' is corrupted.\n"
629 "The file has a `.stabs' section, but no `.stabstr' "
634 /* FIXME: dubious. Why can't we use something normal like
635 bfd_get_section_contents? */
636 bfd_seek (abfd, abfd->where, 0);
638 stabstrsize = bfd_section_size (abfd, info->stabstrsect);
640 coffstab_build_psymtabs (objfile,
642 info->textaddr, info->textsize,
644 info->stabstrsect->filepos, stabstrsize);
646 if (dwarf2_has_info (abfd))
648 /* DWARF2 sections. */
649 dwarf2_build_psymtabs (objfile, mainline);
652 do_cleanups (back_to);
656 coff_new_init (struct objfile *ignore)
660 /* Perform any local cleanups required when we are done with a particular
661 objfile. I.E, we are in the process of discarding all symbol information
662 for an objfile, freeing up all memory held for it, and unlinking the
663 objfile struct from the global list of known objfiles. */
666 coff_symfile_finish (struct objfile *objfile)
668 if (objfile->sym_private != NULL)
670 xmfree (objfile->md, objfile->sym_private);
673 /* Let stabs reader clean up */
674 stabsread_clear_cache ();
678 /* Given pointers to a symbol table in coff style exec file,
679 analyze them and create struct symtab's describing the symbols.
680 NSYMS is the number of symbols in the symbol table.
681 We read them one at a time using read_one_sym (). */
684 coff_symtab_read (long symtab_offset, unsigned int nsyms,
685 struct objfile *objfile)
687 register struct context_stack *new;
688 struct coff_symbol coff_symbol;
689 register struct coff_symbol *cs = &coff_symbol;
690 static struct internal_syment main_sym;
691 static union internal_auxent main_aux;
692 struct coff_symbol fcn_cs_saved;
693 static struct internal_syment fcn_sym_saved;
694 static union internal_auxent fcn_aux_saved;
696 /* A .file is open. */
697 int in_source_file = 0;
698 int next_file_symnum = -1;
699 /* Name of the current file. */
700 char *filestring = "";
702 int fcn_first_line = 0;
703 CORE_ADDR fcn_first_line_addr = 0;
704 int fcn_last_line = 0;
705 int fcn_start_addr = 0;
706 long fcn_line_ptr = 0;
710 /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous....
711 it's hard to know I've really worked around it. The fix should be
712 harmless, anyway). The symptom of the bug is that the first
713 fread (in read_one_sym), will (in my example) actually get data
714 from file offset 268, when the fseek was to 264 (and ftell shows
715 264). This causes all hell to break loose. I was unable to
716 reproduce this on a short test program which operated on the same
717 file, performing (I think) the same sequence of operations.
719 It stopped happening when I put in this (former) rewind().
721 FIXME: Find out if this has been reported to Sun, whether it has
722 been fixed in a later release, etc. */
724 bfd_seek (objfile->obfd, 0, 0);
726 /* Position to read the symbol table. */
727 val = bfd_seek (objfile->obfd, (long) symtab_offset, 0);
729 perror_with_name (objfile->name);
731 current_objfile = objfile;
732 nlist_bfd_global = objfile->obfd;
733 nlist_nsyms_global = nsyms;
734 last_source_file = NULL;
735 memset (opaque_type_chain, 0, sizeof opaque_type_chain);
737 if (type_vector) /* Get rid of previous one */
739 type_vector_length = 160;
740 type_vector = (struct type **)
741 xmalloc (type_vector_length * sizeof (struct type *));
742 memset (type_vector, 0, type_vector_length * sizeof (struct type *));
744 coff_start_symtab ("");
747 while (symnum < nsyms)
749 QUIT; /* Make this command interruptable. */
751 read_one_sym (cs, &main_sym, &main_aux);
753 if (cs->c_symnum == next_file_symnum && cs->c_sclass != C_FILE)
755 if (last_source_file)
756 coff_end_symtab (objfile);
758 coff_start_symtab ("_globals_");
759 complete_symtab ("_globals_", 0, 0);
760 /* done with all files, everything from here on out is globals */
763 /* Special case for file with type declarations only, no text. */
764 if (!last_source_file && SDB_TYPE (cs->c_type)
765 && cs->c_secnum == N_DEBUG)
766 complete_symtab (filestring, 0, 0);
768 /* Typedefs should not be treated as symbol definitions. */
769 if (ISFCN (cs->c_type) && cs->c_sclass != C_TPDEF)
771 /* Record all functions -- external and static -- in minsyms. */
772 tmpaddr = cs->c_value + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
773 record_minimal_symbol (cs->c_name, tmpaddr, mst_text, objfile);
775 fcn_line_ptr = main_aux.x_sym.x_fcnary.x_fcn.x_lnnoptr;
776 fcn_start_addr = tmpaddr;
778 fcn_sym_saved = main_sym;
779 fcn_aux_saved = main_aux;
783 switch (cs->c_sclass)
792 complaint (&symfile_complaints, "Bad n_sclass for symbol %s",
797 /* c_value field contains symnum of next .file entry in table
798 or symnum of first global after last .file. */
799 next_file_symnum = cs->c_value;
801 filestring = coff_getfilename (&main_aux);
805 /* Complete symbol table for last object file
806 containing debugging information. */
807 if (last_source_file)
809 coff_end_symtab (objfile);
810 coff_start_symtab (filestring);
815 /* C_LABEL is used for labels and static functions. Including
816 it here allows gdb to see static functions when no debug
817 info is available. */
819 /* However, labels within a function can make weird backtraces,
820 so filter them out (from phdm@macqel.be). */
826 case C_THUMBSTATFUNC:
827 if (cs->c_name[0] == '.')
829 if (STREQ (cs->c_name, ".text"))
831 /* FIXME: don't wire in ".text" as section name
833 /* Check for in_source_file deals with case of
834 a file with debugging symbols
835 followed by a later file with no symbols. */
837 complete_symtab (filestring,
838 cs->c_value + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)),
839 main_aux.x_scn.x_scnlen);
842 /* flush rest of '.' symbols */
845 else if (!SDB_TYPE (cs->c_type)
846 && cs->c_name[0] == 'L'
847 && (strncmp (cs->c_name, "LI%", 3) == 0
848 || strncmp (cs->c_name, "LF%", 3) == 0
849 || strncmp (cs->c_name, "LC%", 3) == 0
850 || strncmp (cs->c_name, "LP%", 3) == 0
851 || strncmp (cs->c_name, "LPB%", 4) == 0
852 || strncmp (cs->c_name, "LBB%", 4) == 0
853 || strncmp (cs->c_name, "LBE%", 4) == 0
854 || strncmp (cs->c_name, "LPBX%", 5) == 0))
855 /* At least on a 3b1, gcc generates swbeg and string labels
856 that look like this. Ignore them. */
858 /* fall in for static symbols that don't start with '.' */
863 /* Record it in the minimal symbols regardless of
864 SDB_TYPE. This parallels what we do for other debug
865 formats, and probably is needed to make
866 print_address_symbolic work right without the (now
867 gone) "set fast-symbolic-addr off" kludge. */
869 /* FIXME: should use mst_abs, and not relocate, if absolute. */
870 enum minimal_symbol_type ms_type;
873 if (cs->c_secnum == N_UNDEF)
875 /* This is a common symbol. See if the target
876 environment knows where it has been relocated to. */
878 if (target_lookup_symbol (cs->c_name, &reladdr))
880 /* Error in lookup; ignore symbol. */
884 /* The address has already been relocated; make sure that
885 objfile_relocate doesn't relocate it again. */
887 ms_type = cs->c_sclass == C_EXT
888 || cs->c_sclass == C_THUMBEXT ?
889 mst_bss : mst_file_bss;
893 sec = cs_to_section (cs, objfile);
894 tmpaddr = cs->c_value;
895 if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC
896 || cs->c_sclass == C_THUMBEXT)
897 tmpaddr += ANOFFSET (objfile->section_offsets, sec);
899 if (sec == SECT_OFF_TEXT (objfile))
902 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC
903 || cs->c_sclass == C_THUMBEXT ?
904 mst_text : mst_file_text;
905 tmpaddr = SMASH_TEXT_ADDRESS (tmpaddr);
907 else if (sec == SECT_OFF_DATA (objfile))
910 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT ?
911 mst_data : mst_file_data;
913 else if (sec == SECT_OFF_BSS (objfile))
916 cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT ?
917 mst_data : mst_file_data;
920 ms_type = mst_unknown;
923 if (cs->c_name[0] != '@' /* Skip tdesc symbols */ )
925 struct minimal_symbol *msym;
927 /* FIXME: cagney/2001-02-01: The nasty (int) -> (long)
928 -> (void*) cast is to ensure that that the value of
929 cs->c_sclass can be correctly stored in a void
930 pointer in MSYMBOL_INFO. Better solutions
932 gdb_assert (sizeof (void *) >= sizeof (cs->c_sclass));
933 msym = prim_record_minimal_symbol_and_info
934 (cs->c_name, tmpaddr, ms_type, (void *) (long) cs->c_sclass,
937 COFF_MAKE_MSYMBOL_SPECIAL (cs->c_sclass, msym);
939 if (SDB_TYPE (cs->c_type))
942 sym = process_coff_symbol
943 (cs, &main_aux, objfile);
944 SYMBOL_VALUE (sym) = tmpaddr;
945 SYMBOL_SECTION (sym) = sec;
951 if (STREQ (cs->c_name, ".bf"))
955 /* value contains address of first non-init type code */
956 /* main_aux.x_sym.x_misc.x_lnsz.x_lnno
957 contains line number of '{' } */
959 complaint (&symfile_complaints,
960 "`.bf' symbol %d has no aux entry", cs->c_symnum);
961 fcn_first_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
962 fcn_first_line_addr = cs->c_value;
964 /* Might want to check that locals are 0 and
965 context_stack_depth is zero, and complain if not. */
968 new = push_context (depth, fcn_start_addr);
969 fcn_cs_saved.c_name = getsymname (&fcn_sym_saved);
971 process_coff_symbol (&fcn_cs_saved, &fcn_aux_saved, objfile);
973 else if (STREQ (cs->c_name, ".ef"))
975 if (!within_function)
976 error ("Bad coff function information\n");
977 /* the value of .ef is the address of epilogue code;
978 not useful for gdb. */
979 /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
980 contains number of lines to '}' */
982 if (context_stack_depth <= 0)
983 { /* We attempted to pop an empty context stack */
984 complaint (&symfile_complaints,
985 "`.ef' symbol without matching `.bf' symbol ignored starting at symnum %d",
991 new = pop_context ();
992 /* Stack must be empty now. */
993 if (context_stack_depth > 0 || new == NULL)
995 complaint (&symfile_complaints,
996 "Unmatched .ef symbol(s) ignored starting at symnum %d",
1001 if (cs->c_naux != 1)
1003 complaint (&symfile_complaints,
1004 "`.ef' symbol %d has no aux entry", cs->c_symnum);
1005 fcn_last_line = 0x7FFFFFFF;
1009 fcn_last_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno;
1011 /* fcn_first_line is the line number of the opening '{'.
1012 Do not record it - because it would affect gdb's idea
1013 of the line number of the first statement of the function -
1014 except for one-line functions, for which it is also the line
1015 number of all the statements and of the closing '}', and
1016 for which we do not have any other statement-line-number. */
1017 if (fcn_last_line == 1)
1018 record_line (current_subfile, fcn_first_line,
1019 fcn_first_line_addr);
1021 enter_linenos (fcn_line_ptr, fcn_first_line, fcn_last_line,
1024 finish_block (new->name, &local_symbols, new->old_blocks,
1026 #if defined (FUNCTION_EPILOGUE_SIZE)
1027 /* This macro should be defined only on
1029 fcn_aux_saved.x_sym.x_misc.x_fsize
1030 field is always zero.
1031 So use the .bf record information that
1032 points to the epilogue and add the size
1035 + FUNCTION_EPILOGUE_SIZE
1036 + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)),
1038 fcn_cs_saved.c_value
1039 + fcn_aux_saved.x_sym.x_misc.x_fsize
1040 + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)),
1044 within_function = 0;
1049 if (STREQ (cs->c_name, ".bb"))
1051 tmpaddr = cs->c_value;
1052 tmpaddr += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
1053 push_context (++depth, tmpaddr);
1055 else if (STREQ (cs->c_name, ".eb"))
1057 if (context_stack_depth <= 0)
1058 { /* We attempted to pop an empty context stack */
1059 complaint (&symfile_complaints,
1060 "`.eb' symbol without matching `.bb' symbol ignored starting at symnum %d",
1065 new = pop_context ();
1066 if (depth-- != new->depth)
1068 complaint (&symfile_complaints,
1069 "Mismatched .eb symbol ignored starting at symnum %d",
1073 if (local_symbols && context_stack_depth > 0)
1076 cs->c_value + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
1077 /* Make a block for the local symbols within. */
1078 finish_block (0, &local_symbols, new->old_blocks,
1079 new->start_addr, tmpaddr, objfile);
1081 /* Now pop locals of block just finished. */
1082 local_symbols = new->locals;
1087 process_coff_symbol (cs, &main_aux, objfile);
1092 if ((nsyms == 0) && (pe_file))
1094 /* We've got no debugging symbols, but it's is a portable
1095 executable, so try to read the export table */
1096 read_pe_exported_syms (objfile);
1099 if (last_source_file)
1100 coff_end_symtab (objfile);
1102 /* Patch up any opaque types (references to types that are not defined
1103 in the file where they are referenced, e.g. "struct foo *bar"). */
1104 ALL_OBJFILE_SYMTABS (objfile, s)
1105 patch_opaque_types (s);
1107 current_objfile = NULL;
1110 /* Routines for reading headers and symbols from executable. */
1112 /* Read the next symbol, swap it, and return it in both internal_syment
1113 form, and coff_symbol form. Also return its first auxent, if any,
1114 in internal_auxent form, and skip any other auxents. */
1117 read_one_sym (register struct coff_symbol *cs,
1118 register struct internal_syment *sym,
1119 register union internal_auxent *aux)
1123 cs->c_symnum = symnum;
1124 bfd_bread (temp_sym, local_symesz, nlist_bfd_global);
1125 bfd_coff_swap_sym_in (symfile_bfd, temp_sym, (char *) sym);
1126 cs->c_naux = sym->n_numaux & 0xff;
1127 if (cs->c_naux >= 1)
1129 bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1130 bfd_coff_swap_aux_in (symfile_bfd, temp_aux, sym->n_type, sym->n_sclass,
1131 0, cs->c_naux, (char *) aux);
1132 /* If more than one aux entry, read past it (only the first aux
1134 for (i = 1; i < cs->c_naux; i++)
1135 bfd_bread (temp_aux, local_auxesz, nlist_bfd_global);
1137 cs->c_name = getsymname (sym);
1138 cs->c_value = sym->n_value;
1139 cs->c_sclass = (sym->n_sclass & 0xff);
1140 cs->c_secnum = sym->n_scnum;
1141 cs->c_type = (unsigned) sym->n_type;
1142 if (!SDB_TYPE (cs->c_type))
1146 if (cs->c_sclass & 128)
1147 printf ("thumb symbol %s, class 0x%x\n", cs->c_name, cs->c_sclass);
1150 symnum += 1 + cs->c_naux;
1152 /* The PE file format stores symbol values as offsets within the
1153 section, rather than as absolute addresses. We correct that
1154 here, if the symbol has an appropriate storage class. FIXME: We
1155 should use BFD to read the symbols, rather than duplicating the
1159 switch (cs->c_sclass)
1163 case C_THUMBEXTFUNC:
1168 case C_THUMBSTATFUNC:
1174 if (cs->c_secnum != 0)
1175 cs->c_value += cs_section_address (cs, symfile_bfd);
1181 /* Support for string table handling */
1183 static char *stringtab = NULL;
1186 init_stringtab (bfd *abfd, long offset)
1190 unsigned char lengthbuf[4];
1194 /* If the file is stripped, the offset might be zero, indicating no
1195 string table. Just return with `stringtab' set to null. */
1199 if (bfd_seek (abfd, offset, 0) < 0)
1202 val = bfd_bread ((char *) lengthbuf, sizeof lengthbuf, abfd);
1203 length = bfd_h_get_32 (symfile_bfd, lengthbuf);
1205 /* If no string table is needed, then the file may end immediately
1206 after the symbols. Just return with `stringtab' set to null. */
1207 if (val != sizeof lengthbuf || length < sizeof lengthbuf)
1210 stringtab = (char *) xmalloc (length);
1211 /* This is in target format (probably not very useful, and not currently
1212 used), not host format. */
1213 memcpy (stringtab, lengthbuf, sizeof lengthbuf);
1214 if (length == sizeof length) /* Empty table -- just the count */
1217 val = bfd_bread (stringtab + sizeof lengthbuf, length - sizeof lengthbuf,
1219 if (val != length - sizeof lengthbuf || stringtab[length - 1] != '\0')
1226 free_stringtab (void)
1234 free_stringtab_cleanup (void *ignore)
1240 getsymname (struct internal_syment *symbol_entry)
1242 static char buffer[SYMNMLEN + 1];
1245 if (symbol_entry->_n._n_n._n_zeroes == 0)
1247 /* FIXME: Probably should be detecting corrupt symbol files by
1248 seeing whether offset points to within the stringtab. */
1249 result = stringtab + symbol_entry->_n._n_n._n_offset;
1253 strncpy (buffer, symbol_entry->_n._n_name, SYMNMLEN);
1254 buffer[SYMNMLEN] = '\0';
1260 /* Extract the file name from the aux entry of a C_FILE symbol. Return
1261 only the last component of the name. Result is in static storage and
1262 is only good for temporary use. */
1265 coff_getfilename (union internal_auxent *aux_entry)
1267 static char buffer[BUFSIZ];
1268 register char *temp;
1271 if (aux_entry->x_file.x_n.x_zeroes == 0)
1272 strcpy (buffer, stringtab + aux_entry->x_file.x_n.x_offset);
1275 strncpy (buffer, aux_entry->x_file.x_fname, FILNMLEN);
1276 buffer[FILNMLEN] = '\0';
1280 /* FIXME: We should not be throwing away the information about what
1281 directory. It should go into dirname of the symtab, or some such
1283 if ((temp = strrchr (result, '/')) != NULL)
1288 /* Support for line number handling. */
1290 static char *linetab = NULL;
1291 static long linetab_offset;
1292 static unsigned long linetab_size;
1294 /* Read in all the line numbers for fast lookups later. Leave them in
1295 external (unswapped) format in memory; we'll swap them as we enter
1296 them into GDB's data structures. */
1299 init_lineno (bfd *abfd, long offset, int size)
1303 linetab_offset = offset;
1304 linetab_size = size;
1311 if (bfd_seek (abfd, offset, 0) < 0)
1314 /* Allocate the desired table, plus a sentinel */
1315 linetab = (char *) xmalloc (size + local_linesz);
1317 val = bfd_bread (linetab, size, abfd);
1321 /* Terminate it with an all-zero sentinel record */
1322 memset (linetab + size, 0, local_linesz);
1336 free_linetab_cleanup (void *ignore)
1341 #if !defined (L_LNNO32)
1342 #define L_LNNO32(lp) ((lp)->l_lnno)
1346 enter_linenos (long file_offset, register int first_line,
1347 register int last_line, struct objfile *objfile)
1349 register char *rawptr;
1350 struct internal_lineno lptr;
1354 if (file_offset < linetab_offset)
1356 complaint (&symfile_complaints,
1357 "Line number pointer %ld lower than start of line numbers",
1359 if (file_offset > linetab_size) /* Too big to be an offset? */
1361 file_offset += linetab_offset; /* Try reading at that linetab offset */
1364 rawptr = &linetab[file_offset - linetab_offset];
1366 /* skip first line entry for each function */
1367 rawptr += local_linesz;
1368 /* line numbers start at one for the first line of the function */
1373 bfd_coff_swap_lineno_in (symfile_bfd, rawptr, &lptr);
1374 rawptr += local_linesz;
1375 /* The next function, or the sentinel, will have L_LNNO32 zero; we exit. */
1376 if (L_LNNO32 (&lptr) && L_LNNO32 (&lptr) <= last_line)
1377 record_line (current_subfile, first_line + L_LNNO32 (&lptr),
1379 + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)));
1386 patch_type (struct type *type, struct type *real_type)
1388 register struct type *target = TYPE_TARGET_TYPE (type);
1389 register struct type *real_target = TYPE_TARGET_TYPE (real_type);
1390 int field_size = TYPE_NFIELDS (real_target) * sizeof (struct field);
1392 TYPE_LENGTH (target) = TYPE_LENGTH (real_target);
1393 TYPE_NFIELDS (target) = TYPE_NFIELDS (real_target);
1394 TYPE_FIELDS (target) = (struct field *) TYPE_ALLOC (target, field_size);
1396 memcpy (TYPE_FIELDS (target), TYPE_FIELDS (real_target), field_size);
1398 if (TYPE_NAME (real_target))
1400 if (TYPE_NAME (target))
1401 xfree (TYPE_NAME (target));
1402 TYPE_NAME (target) = concat (TYPE_NAME (real_target), NULL);
1406 /* Patch up all appropriate typedef symbols in the opaque_type_chains
1407 so that they can be used to print out opaque data structures properly. */
1410 patch_opaque_types (struct symtab *s)
1412 register struct block *b;
1414 register struct symbol *real_sym;
1416 /* Go through the per-file symbols only */
1417 b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), STATIC_BLOCK);
1418 ALL_BLOCK_SYMBOLS (b, i, real_sym)
1420 /* Find completed typedefs to use to fix opaque ones.
1421 Remove syms from the chain when their types are stored,
1422 but search the whole chain, as there may be several syms
1423 from different files with the same name. */
1424 if (SYMBOL_CLASS (real_sym) == LOC_TYPEDEF &&
1425 SYMBOL_NAMESPACE (real_sym) == VAR_NAMESPACE &&
1426 TYPE_CODE (SYMBOL_TYPE (real_sym)) == TYPE_CODE_PTR &&
1427 TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym))) != 0)
1429 register char *name = SYMBOL_NAME (real_sym);
1430 register int hash = hashname (name);
1431 register struct symbol *sym, *prev;
1434 for (sym = opaque_type_chain[hash]; sym;)
1436 if (name[0] == SYMBOL_NAME (sym)[0] &&
1437 STREQ (name + 1, SYMBOL_NAME (sym) + 1))
1441 SYMBOL_VALUE_CHAIN (prev) = SYMBOL_VALUE_CHAIN (sym);
1445 opaque_type_chain[hash] = SYMBOL_VALUE_CHAIN (sym);
1448 patch_type (SYMBOL_TYPE (sym), SYMBOL_TYPE (real_sym));
1452 sym = SYMBOL_VALUE_CHAIN (prev);
1456 sym = opaque_type_chain[hash];
1462 sym = SYMBOL_VALUE_CHAIN (sym);
1469 static struct symbol *
1470 process_coff_symbol (register struct coff_symbol *cs,
1471 register union internal_auxent *aux,
1472 struct objfile *objfile)
1474 register struct symbol *sym
1475 = (struct symbol *) obstack_alloc (&objfile->symbol_obstack,
1476 sizeof (struct symbol));
1479 memset (sym, 0, sizeof (struct symbol));
1481 name = EXTERNAL_NAME (name, objfile->obfd);
1482 SYMBOL_LANGUAGE (sym) = language_auto;
1483 SYMBOL_SET_NAMES (sym, name, strlen (name), objfile);
1485 /* default assumptions */
1486 SYMBOL_VALUE (sym) = cs->c_value;
1487 SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
1488 SYMBOL_SECTION (sym) = cs_to_section (cs, objfile);
1490 if (ISFCN (cs->c_type))
1492 SYMBOL_VALUE (sym) += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
1494 lookup_function_type (decode_function_type (cs, cs->c_type, aux));
1496 SYMBOL_CLASS (sym) = LOC_BLOCK;
1497 if (cs->c_sclass == C_STAT || cs->c_sclass == C_THUMBSTAT
1498 || cs->c_sclass == C_THUMBSTATFUNC)
1499 add_symbol_to_list (sym, &file_symbols);
1500 else if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT
1501 || cs->c_sclass == C_THUMBEXTFUNC)
1502 add_symbol_to_list (sym, &global_symbols);
1506 SYMBOL_TYPE (sym) = decode_type (cs, cs->c_type, aux);
1507 switch (cs->c_sclass)
1513 SYMBOL_CLASS (sym) = LOC_LOCAL;
1514 add_symbol_to_list (sym, &local_symbols);
1518 case C_THUMBEXTFUNC:
1520 SYMBOL_CLASS (sym) = LOC_STATIC;
1521 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1522 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
1523 add_symbol_to_list (sym, &global_symbols);
1527 case C_THUMBSTATFUNC:
1529 SYMBOL_CLASS (sym) = LOC_STATIC;
1530 SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value;
1531 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
1532 if (within_function)
1534 /* Static symbol of local scope */
1535 add_symbol_to_list (sym, &local_symbols);
1539 /* Static symbol at top level of file */
1540 add_symbol_to_list (sym, &file_symbols);
1544 #ifdef C_GLBLREG /* AMD coff */
1548 SYMBOL_CLASS (sym) = LOC_REGISTER;
1549 SYMBOL_VALUE (sym) = SDB_REG_TO_REGNUM (cs->c_value);
1550 add_symbol_to_list (sym, &local_symbols);
1558 SYMBOL_CLASS (sym) = LOC_ARG;
1559 add_symbol_to_list (sym, &local_symbols);
1560 #if !defined (BELIEVE_PCC_PROMOTION)
1561 if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
1563 /* If PCC says a parameter is a short or a char,
1564 aligned on an int boundary, realign it to the
1565 "little end" of the int. */
1566 struct type *temptype;
1567 temptype = lookup_fundamental_type (current_objfile,
1569 if (TYPE_LENGTH (SYMBOL_TYPE (sym)) < TYPE_LENGTH (temptype)
1570 && TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_INT
1571 && 0 == SYMBOL_VALUE (sym) % TYPE_LENGTH (temptype))
1573 SYMBOL_VALUE (sym) +=
1574 TYPE_LENGTH (temptype)
1575 - TYPE_LENGTH (SYMBOL_TYPE (sym));
1582 SYMBOL_CLASS (sym) = LOC_REGPARM;
1583 SYMBOL_VALUE (sym) = SDB_REG_TO_REGNUM (cs->c_value);
1584 add_symbol_to_list (sym, &local_symbols);
1585 #if !defined (BELIEVE_PCC_PROMOTION)
1586 /* FIXME: This should retain the current type, since it's just
1587 a register value. gnu@adobe, 26Feb93 */
1589 /* If PCC says a parameter is a short or a char,
1590 it is really an int. */
1591 struct type *temptype;
1593 lookup_fundamental_type (current_objfile, FT_INTEGER);
1594 if (TYPE_LENGTH (SYMBOL_TYPE (sym)) < TYPE_LENGTH (temptype)
1595 && TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_INT)
1598 (TYPE_UNSIGNED (SYMBOL_TYPE (sym))
1599 ? lookup_fundamental_type (current_objfile,
1600 FT_UNSIGNED_INTEGER)
1608 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
1609 SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
1611 /* If type has no name, give it one */
1612 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
1614 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR
1615 || TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_FUNC)
1617 /* If we are giving a name to a type such as "pointer to
1618 foo" or "function returning foo", we better not set
1619 the TYPE_NAME. If the program contains "typedef char
1620 *caddr_t;", we don't want all variables of type char
1621 * to print as caddr_t. This is not just a
1622 consequence of GDB's type management; CC and GCC (at
1623 least through version 2.4) both output variables of
1624 either type char * or caddr_t with the type
1625 refering to the C_TPDEF symbol for caddr_t. If a future
1626 compiler cleans this up it GDB is not ready for it
1627 yet, but if it becomes ready we somehow need to
1628 disable this check (without breaking the PCC/GCC2.4
1633 Fortunately, this check seems not to be necessary
1634 for anything except pointers or functions. */
1638 TYPE_NAME (SYMBOL_TYPE (sym)) =
1639 concat (SYMBOL_NAME (sym), NULL);
1642 /* Ignore vendor section for Harris CX/UX targets. */
1643 else if (cs->c_name[0] == '$')
1645 #endif /* CXUX_TARGET */
1647 /* Keep track of any type which points to empty structured type,
1648 so it can be filled from a definition from another file. A
1649 simple forward reference (TYPE_CODE_UNDEF) is not an
1650 empty structured type, though; the forward references
1651 work themselves out via the magic of coff_lookup_type. */
1652 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR &&
1653 TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym))) == 0 &&
1654 TYPE_CODE (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym))) !=
1657 register int i = hashname (SYMBOL_NAME (sym));
1659 SYMBOL_VALUE_CHAIN (sym) = opaque_type_chain[i];
1660 opaque_type_chain[i] = sym;
1662 add_symbol_to_list (sym, &file_symbols);
1668 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
1669 SYMBOL_NAMESPACE (sym) = STRUCT_NAMESPACE;
1671 /* Some compilers try to be helpful by inventing "fake"
1672 names for anonymous enums, structures, and unions, like
1673 "~0fake" or ".0fake". Thanks, but no thanks... */
1674 if (TYPE_TAG_NAME (SYMBOL_TYPE (sym)) == 0)
1675 if (SYMBOL_NAME (sym) != NULL
1676 && *SYMBOL_NAME (sym) != '~'
1677 && *SYMBOL_NAME (sym) != '.')
1678 TYPE_TAG_NAME (SYMBOL_TYPE (sym)) =
1679 concat (SYMBOL_NAME (sym), NULL);
1681 add_symbol_to_list (sym, &file_symbols);
1691 /* Decode a coff type specifier; return the type that is meant. */
1693 static struct type *
1694 decode_type (register struct coff_symbol *cs, unsigned int c_type,
1695 register union internal_auxent *aux)
1697 register struct type *type = 0;
1698 unsigned int new_c_type;
1700 if (c_type & ~N_BTMASK)
1702 new_c_type = DECREF (c_type);
1705 type = decode_type (cs, new_c_type, aux);
1706 type = lookup_pointer_type (type);
1708 else if (ISFCN (c_type))
1710 type = decode_type (cs, new_c_type, aux);
1711 type = lookup_function_type (type);
1713 else if (ISARY (c_type))
1716 register unsigned short *dim;
1717 struct type *base_type, *index_type, *range_type;
1719 /* Define an array type. */
1720 /* auxent refers to array, not base type */
1721 if (aux->x_sym.x_tagndx.l == 0)
1724 /* shift the indices down */
1725 dim = &aux->x_sym.x_fcnary.x_ary.x_dimen[0];
1728 for (i = 0; *dim && i < DIMNUM - 1; i++, dim++)
1732 base_type = decode_type (cs, new_c_type, aux);
1733 index_type = lookup_fundamental_type (current_objfile, FT_INTEGER);
1735 create_range_type ((struct type *) NULL, index_type, 0, n - 1);
1737 create_array_type ((struct type *) NULL, base_type, range_type);
1742 /* Reference to existing type. This only occurs with the
1743 struct, union, and enum types. EPI a29k coff
1744 fakes us out by producing aux entries with a nonzero
1745 x_tagndx for definitions of structs, unions, and enums, so we
1746 have to check the c_sclass field. SCO 3.2v4 cc gets confused
1747 with pointers to pointers to defined structs, and generates
1748 negative x_tagndx fields. */
1749 if (cs->c_naux > 0 && aux->x_sym.x_tagndx.l != 0)
1751 if (cs->c_sclass != C_STRTAG
1752 && cs->c_sclass != C_UNTAG
1753 && cs->c_sclass != C_ENTAG
1754 && aux->x_sym.x_tagndx.l >= 0)
1756 type = coff_alloc_type (aux->x_sym.x_tagndx.l);
1761 complaint (&symfile_complaints,
1762 "Symbol table entry for %s has bad tagndx value",
1764 /* And fall through to decode_base_type... */
1768 return decode_base_type (cs, BTYPE (c_type), aux);
1771 /* Decode a coff type specifier for function definition;
1772 return the type that the function returns. */
1774 static struct type *
1775 decode_function_type (register struct coff_symbol *cs, unsigned int c_type,
1776 register union internal_auxent *aux)
1778 if (aux->x_sym.x_tagndx.l == 0)
1779 cs->c_naux = 0; /* auxent refers to function, not base type */
1781 return decode_type (cs, DECREF (c_type), aux);
1786 static struct type *
1787 decode_base_type (register struct coff_symbol *cs, unsigned int c_type,
1788 register union internal_auxent *aux)
1795 /* shows up with "void (*foo)();" structure members */
1796 return lookup_fundamental_type (current_objfile, FT_VOID);
1799 /* DGUX actually defines both T_ARG and T_VOID to the same value. */
1802 /* Shows up in DGUX, I think. Not sure where. */
1803 return lookup_fundamental_type (current_objfile, FT_VOID); /* shouldn't show up here */
1809 /* Intel 960 COFF has this symbol and meaning. */
1810 return lookup_fundamental_type (current_objfile, FT_VOID);
1814 return lookup_fundamental_type (current_objfile, FT_CHAR);
1817 return lookup_fundamental_type (current_objfile, FT_SHORT);
1820 return lookup_fundamental_type (current_objfile, FT_INTEGER);
1823 if (cs->c_sclass == C_FIELD
1824 && aux->x_sym.x_misc.x_lnsz.x_size > TARGET_LONG_BIT)
1825 return lookup_fundamental_type (current_objfile, FT_LONG_LONG);
1827 return lookup_fundamental_type (current_objfile, FT_LONG);
1830 return lookup_fundamental_type (current_objfile, FT_FLOAT);
1833 return lookup_fundamental_type (current_objfile, FT_DBL_PREC_FLOAT);
1836 return lookup_fundamental_type (current_objfile, FT_EXT_PREC_FLOAT);
1839 if (cs->c_naux != 1)
1841 /* anonymous structure type */
1842 type = coff_alloc_type (cs->c_symnum);
1843 TYPE_CODE (type) = TYPE_CODE_STRUCT;
1844 TYPE_NAME (type) = NULL;
1845 /* This used to set the tag to "<opaque>". But I think setting it
1846 to NULL is right, and the printing code can print it as
1848 TYPE_TAG_NAME (type) = NULL;
1849 INIT_CPLUS_SPECIFIC (type);
1850 TYPE_LENGTH (type) = 0;
1851 TYPE_FIELDS (type) = 0;
1852 TYPE_NFIELDS (type) = 0;
1856 type = coff_read_struct_type (cs->c_symnum,
1857 aux->x_sym.x_misc.x_lnsz.x_size,
1858 aux->x_sym.x_fcnary.x_fcn.x_endndx.l);
1863 if (cs->c_naux != 1)
1865 /* anonymous union type */
1866 type = coff_alloc_type (cs->c_symnum);
1867 TYPE_NAME (type) = NULL;
1868 /* This used to set the tag to "<opaque>". But I think setting it
1869 to NULL is right, and the printing code can print it as
1871 TYPE_TAG_NAME (type) = NULL;
1872 INIT_CPLUS_SPECIFIC (type);
1873 TYPE_LENGTH (type) = 0;
1874 TYPE_FIELDS (type) = 0;
1875 TYPE_NFIELDS (type) = 0;
1879 type = coff_read_struct_type (cs->c_symnum,
1880 aux->x_sym.x_misc.x_lnsz.x_size,
1881 aux->x_sym.x_fcnary.x_fcn.x_endndx.l);
1883 TYPE_CODE (type) = TYPE_CODE_UNION;
1887 if (cs->c_naux != 1)
1889 /* anonymous enum type */
1890 type = coff_alloc_type (cs->c_symnum);
1891 TYPE_CODE (type) = TYPE_CODE_ENUM;
1892 TYPE_NAME (type) = NULL;
1893 /* This used to set the tag to "<opaque>". But I think setting it
1894 to NULL is right, and the printing code can print it as
1896 TYPE_TAG_NAME (type) = NULL;
1897 TYPE_LENGTH (type) = 0;
1898 TYPE_FIELDS (type) = 0;
1899 TYPE_NFIELDS (type) = 0;
1903 type = coff_read_enum_type (cs->c_symnum,
1904 aux->x_sym.x_misc.x_lnsz.x_size,
1905 aux->x_sym.x_fcnary.x_fcn.x_endndx.l);
1910 /* shouldn't show up here */
1914 return lookup_fundamental_type (current_objfile, FT_UNSIGNED_CHAR);
1917 return lookup_fundamental_type (current_objfile, FT_UNSIGNED_SHORT);
1920 return lookup_fundamental_type (current_objfile, FT_UNSIGNED_INTEGER);
1923 if (cs->c_sclass == C_FIELD
1924 && aux->x_sym.x_misc.x_lnsz.x_size > TARGET_LONG_BIT)
1925 return lookup_fundamental_type (current_objfile, FT_UNSIGNED_LONG_LONG);
1927 return lookup_fundamental_type (current_objfile, FT_UNSIGNED_LONG);
1929 complaint (&symfile_complaints, "Unexpected type for symbol %s", cs->c_name);
1930 return lookup_fundamental_type (current_objfile, FT_VOID);
1933 /* This page contains subroutines of read_type. */
1935 /* Read the description of a structure (or union type) and return an
1936 object describing the type. */
1938 static struct type *
1939 coff_read_struct_type (int index, int length, int lastsym)
1943 struct nextfield *next;
1947 register struct type *type;
1948 register struct nextfield *list = 0;
1949 struct nextfield *new;
1953 struct coff_symbol member_sym;
1954 register struct coff_symbol *ms = &member_sym;
1955 struct internal_syment sub_sym;
1956 union internal_auxent sub_aux;
1959 type = coff_alloc_type (index);
1960 TYPE_CODE (type) = TYPE_CODE_STRUCT;
1961 INIT_CPLUS_SPECIFIC (type);
1962 TYPE_LENGTH (type) = length;
1964 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
1966 read_one_sym (ms, &sub_sym, &sub_aux);
1968 name = EXTERNAL_NAME (name, current_objfile->obfd);
1970 switch (ms->c_sclass)
1975 /* Get space to record the next field's data. */
1976 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1980 /* Save the data. */
1984 ¤t_objfile->symbol_obstack);
1985 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type, &sub_aux);
1986 FIELD_BITPOS (list->field) = 8 * ms->c_value;
1987 FIELD_BITSIZE (list->field) = 0;
1988 FIELD_STATIC_KIND (list->field) = 0;
1994 /* Get space to record the next field's data. */
1995 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1999 /* Save the data. */
2003 ¤t_objfile->symbol_obstack);
2004 FIELD_TYPE (list->field) = decode_type (ms, ms->c_type, &sub_aux);
2005 FIELD_BITPOS (list->field) = ms->c_value;
2006 FIELD_BITSIZE (list->field) = sub_aux.x_sym.x_misc.x_lnsz.x_size;
2007 FIELD_STATIC_KIND (list->field) = 0;
2016 /* Now create the vector of fields, and record how big it is. */
2018 TYPE_NFIELDS (type) = nfields;
2019 TYPE_FIELDS (type) = (struct field *)
2020 TYPE_ALLOC (type, sizeof (struct field) * nfields);
2022 /* Copy the saved-up fields into the field vector. */
2024 for (n = nfields; list; list = list->next)
2025 TYPE_FIELD (type, --n) = list->field;
2030 /* Read a definition of an enumeration type,
2031 and create and return a suitable type object.
2032 Also defines the symbols that represent the values of the type. */
2035 static struct type *
2036 coff_read_enum_type (int index, int length, int lastsym)
2038 register struct symbol *sym;
2039 register struct type *type;
2042 struct pending **symlist;
2043 struct coff_symbol member_sym;
2044 register struct coff_symbol *ms = &member_sym;
2045 struct internal_syment sub_sym;
2046 union internal_auxent sub_aux;
2047 struct pending *osyms, *syms;
2051 int unsigned_enum = 1;
2053 type = coff_alloc_type (index);
2054 if (within_function)
2055 symlist = &local_symbols;
2057 symlist = &file_symbols;
2059 o_nsyms = osyms ? osyms->nsyms : 0;
2061 while (!done && symnum < lastsym && symnum < nlist_nsyms_global)
2063 read_one_sym (ms, &sub_sym, &sub_aux);
2065 name = EXTERNAL_NAME (name, current_objfile->obfd);
2067 switch (ms->c_sclass)
2070 sym = (struct symbol *) obstack_alloc
2071 (¤t_objfile->symbol_obstack,
2072 sizeof (struct symbol));
2073 memset (sym, 0, sizeof (struct symbol));
2076 obsavestring (name, strlen (name),
2077 ¤t_objfile->symbol_obstack);
2078 SYMBOL_CLASS (sym) = LOC_CONST;
2079 SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
2080 SYMBOL_VALUE (sym) = ms->c_value;
2081 add_symbol_to_list (sym, symlist);
2086 /* Sometimes the linker (on 386/ix 2.0.2 at least) screws
2087 up the count of how many symbols to read. So stop
2094 /* Now fill in the fields of the type-structure. */
2097 TYPE_LENGTH (type) = length;
2099 TYPE_LENGTH (type) = TARGET_INT_BIT / TARGET_CHAR_BIT; /* Assume ints */
2100 TYPE_CODE (type) = TYPE_CODE_ENUM;
2101 TYPE_NFIELDS (type) = nsyms;
2102 TYPE_FIELDS (type) = (struct field *)
2103 TYPE_ALLOC (type, sizeof (struct field) * nsyms);
2105 /* Find the symbols for the values and put them into the type.
2106 The symbols can be found in the symlist that we put them on
2107 to cause them to be defined. osyms contains the old value
2108 of that symlist; everything up to there was defined by us. */
2109 /* Note that we preserve the order of the enum constants, so
2110 that in something like "enum {FOO, LAST_THING=FOO}" we print
2111 FOO, not LAST_THING. */
2113 for (syms = *symlist, n = 0; syms; syms = syms->next)
2119 for (; j < syms->nsyms; j++, n++)
2121 struct symbol *xsym = syms->symbol[j];
2122 SYMBOL_TYPE (xsym) = type;
2123 TYPE_FIELD_NAME (type, n) = SYMBOL_NAME (xsym);
2124 TYPE_FIELD_BITPOS (type, n) = SYMBOL_VALUE (xsym);
2125 if (SYMBOL_VALUE (xsym) < 0)
2127 TYPE_FIELD_BITSIZE (type, n) = 0;
2128 TYPE_FIELD_STATIC_KIND (type, n) = 0;
2135 TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED;
2140 /* Register our ability to parse symbols for coff BFD files. */
2142 static struct sym_fns coff_sym_fns =
2144 bfd_target_coff_flavour,
2145 coff_new_init, /* sym_new_init: init anything gbl to entire symtab */
2146 coff_symfile_init, /* sym_init: read initial info, setup for sym_read() */
2147 coff_symfile_read, /* sym_read: read a symbol file into symtab */
2148 coff_symfile_finish, /* sym_finish: finished with file, cleanup */
2149 default_symfile_offsets, /* sym_offsets: xlate external to internal form */
2150 NULL /* next: pointer to next struct sym_fns */
2154 _initialize_coffread (void)
2156 add_symtab_fns (&coff_sym_fns);