Add a comment for the ARM_F{0..7}_REGNUM registers
[binutils-gdb.git] / gdb / dbxread.c
blob99f47c0c9177caa728b4280faa429fe0a3189470
1 /* Read dbx symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1986-2020 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* This module provides three functions: dbx_symfile_init,
20 which initializes to read a symbol file; dbx_new_init, which
21 discards existing cached information when all symbols are being
22 discarded; and dbx_symfile_read, which reads a symbol table
23 from a file.
25 dbx_symfile_read only does the minimum work necessary for letting the
26 user "name" things symbolically; it does not read the entire symtab.
27 Instead, it reads the external and static symbols and puts them in partial
28 symbol tables. When more extensive information is requested of a
29 file, the corresponding partial symbol table is mutated into a full
30 fledged symbol table by going back and reading the symbols
31 for real. dbx_psymtab_to_symtab() is the function that does this */
33 #include "defs.h"
34 #if defined(__CYGNUSCLIB__)
35 #include <sys/types.h>
36 #include <fcntl.h>
37 #endif
39 #include "gdb_obstack.h"
40 #include <sys/stat.h>
41 #include "symtab.h"
42 #include "breakpoint.h"
43 #include "target.h"
44 #include "gdbcore.h" /* for bfd stuff */
45 #include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */
46 #include "filenames.h"
47 #include "objfiles.h"
48 #include "buildsym-legacy.h"
49 #include "stabsread.h"
50 #include "gdb-stabs.h"
51 #include "demangle.h"
52 #include "complaints.h"
53 #include "cp-abi.h"
54 #include "cp-support.h"
55 #include "psympriv.h"
56 #include "block.h"
57 #include "aout/aout64.h"
58 #include "aout/stab_gnu.h" /* We always use GNU stabs, not
59 native, now. */
62 /* Key for dbx-associated data. */
64 objfile_key<dbx_symfile_info> dbx_objfile_data_key;
66 /* We put a pointer to this structure in the read_symtab_private field
67 of the psymtab. */
69 struct symloc
71 /* Offset within the file symbol table of first local symbol for this
72 file. */
74 int ldsymoff;
76 /* Length (in bytes) of the section of the symbol table devoted to
77 this file's symbols (actually, the section bracketed may contain
78 more than just this file's symbols). If ldsymlen is 0, the only
79 reason for this thing's existence is the dependency list. Nothing
80 else will happen when it is read in. */
82 int ldsymlen;
84 /* The size of each symbol in the symbol file (in external form). */
86 int symbol_size;
88 /* Further information needed to locate the symbols if they are in
89 an ELF file. */
91 int symbol_offset;
92 int string_offset;
93 int file_string_offset;
94 enum language pst_language;
97 #define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff)
98 #define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen)
99 #define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private))
100 #define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size)
101 #define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset)
102 #define STRING_OFFSET(p) (SYMLOC(p)->string_offset)
103 #define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset)
104 #define PST_LANGUAGE(p) (SYMLOC(p)->pst_language)
107 /* The objfile we are currently reading. */
109 static struct objfile *dbxread_objfile;
111 /* Remember what we deduced to be the source language of this psymtab. */
113 static enum language psymtab_language = language_unknown;
115 /* The BFD for this file -- implicit parameter to next_symbol_text. */
117 static bfd *symfile_bfd;
119 /* The size of each symbol in the symbol file (in external form).
120 This is set by dbx_symfile_read when building psymtabs, and by
121 dbx_psymtab_to_symtab when building symtabs. */
123 static unsigned symbol_size;
125 /* This is the offset of the symbol table in the executable file. */
127 static unsigned symbol_table_offset;
129 /* This is the offset of the string table in the executable file. */
131 static unsigned string_table_offset;
133 /* For elf+stab executables, the n_strx field is not a simple index
134 into the string table. Instead, each .o file has a base offset in
135 the string table, and the associated symbols contain offsets from
136 this base. The following two variables contain the base offset for
137 the current and next .o files. */
139 static unsigned int file_string_table_offset;
140 static unsigned int next_file_string_table_offset;
142 /* .o and NLM files contain unrelocated addresses which are based at
143 0. When non-zero, this flag disables some of the special cases for
144 Solaris elf+stab text addresses at location 0. */
146 static int symfile_relocatable = 0;
148 /* When set, we are processing a .o file compiled by sun acc. This is
149 misnamed; it refers to all stabs-in-elf implementations which use
150 N_UNDF the way Sun does, including Solaris gcc. Hopefully all
151 stabs-in-elf implementations ever invented will choose to be
152 compatible. */
154 static unsigned char processing_acc_compilation;
157 /* The lowest text address we have yet encountered. This is needed
158 because in an a.out file, there is no header field which tells us
159 what address the program is actually going to be loaded at, so we
160 need to make guesses based on the symbols (which *are* relocated to
161 reflect the address it will be loaded at). */
163 static CORE_ADDR lowest_text_address;
165 /* Non-zero if there is any line number info in the objfile. Prevents
166 dbx_end_psymtab from discarding an otherwise empty psymtab. */
168 static int has_line_numbers;
170 /* Complaints about the symbols we have encountered. */
172 static void
173 unknown_symtype_complaint (const char *arg1)
175 complaint (_("unknown symbol type %s"), arg1);
178 static void
179 lbrac_mismatch_complaint (int arg1)
181 complaint (_("N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d"), arg1);
184 static void
185 repeated_header_complaint (const char *arg1, int arg2)
187 complaint (_("\"repeated\" header file %s not "
188 "previously seen, at symtab pos %d"),
189 arg1, arg2);
192 /* find_text_range --- find start and end of loadable code sections
194 The find_text_range function finds the shortest address range that
195 encloses all sections containing executable code, and stores it in
196 objfile's text_addr and text_size members.
198 dbx_symfile_read will use this to finish off the partial symbol
199 table, in some cases. */
201 static void
202 find_text_range (bfd * sym_bfd, struct objfile *objfile)
204 asection *sec;
205 int found_any = 0;
206 CORE_ADDR start = 0;
207 CORE_ADDR end = 0;
209 for (sec = sym_bfd->sections; sec; sec = sec->next)
210 if (bfd_section_flags (sec) & SEC_CODE)
212 CORE_ADDR sec_start = bfd_section_vma (sec);
213 CORE_ADDR sec_end = sec_start + bfd_section_size (sec);
215 if (found_any)
217 if (sec_start < start)
218 start = sec_start;
219 if (sec_end > end)
220 end = sec_end;
222 else
224 start = sec_start;
225 end = sec_end;
228 found_any = 1;
231 if (!found_any)
232 error (_("Can't find any code sections in symbol file"));
234 DBX_TEXT_ADDR (objfile) = start;
235 DBX_TEXT_SIZE (objfile) = end - start;
240 /* During initial symbol readin, we need to have a structure to keep
241 track of which psymtabs have which bincls in them. This structure
242 is used during readin to setup the list of dependencies within each
243 partial symbol table. */
245 struct header_file_location
247 header_file_location (const char *name_, int instance_,
248 legacy_psymtab *pst_)
249 : name (name_),
250 instance (instance_),
251 pst (pst_)
255 const char *name; /* Name of header file */
256 int instance; /* See above */
257 legacy_psymtab *pst; /* Partial symtab that has the
258 BINCL/EINCL defs for this file. */
261 /* The list of bincls. */
262 static std::vector<struct header_file_location> *bincl_list;
264 /* Local function prototypes. */
266 static void read_ofile_symtab (struct objfile *, legacy_psymtab *);
268 static void dbx_read_symtab (legacy_psymtab *self,
269 struct objfile *objfile);
271 static void dbx_psymtab_to_symtab_1 (legacy_psymtab *, struct objfile *);
273 static void read_dbx_symtab (minimal_symbol_reader &, struct objfile *);
275 static legacy_psymtab *find_corresponding_bincl_psymtab (const char *,
276 int);
278 static const char *dbx_next_symbol_text (struct objfile *);
280 static void fill_symbuf (bfd *);
282 static void dbx_symfile_init (struct objfile *);
284 static void dbx_new_init (struct objfile *);
286 static void dbx_symfile_read (struct objfile *, symfile_add_flags);
288 static void dbx_symfile_finish (struct objfile *);
290 static void record_minimal_symbol (minimal_symbol_reader &,
291 const char *, CORE_ADDR, int,
292 struct objfile *);
294 static void add_new_header_file (const char *, int);
296 static void add_old_header_file (const char *, int);
298 static void add_this_object_header_file (int);
300 static legacy_psymtab *start_psymtab (struct objfile *, const char *,
301 CORE_ADDR, int);
303 /* Free up old header file tables. */
305 void
306 free_header_files (void)
308 if (this_object_header_files)
310 xfree (this_object_header_files);
311 this_object_header_files = NULL;
313 n_allocated_this_object_header_files = 0;
316 /* Allocate new header file tables. */
318 void
319 init_header_files (void)
321 n_allocated_this_object_header_files = 10;
322 this_object_header_files = XNEWVEC (int, 10);
325 /* Add header file number I for this object file
326 at the next successive FILENUM. */
328 static void
329 add_this_object_header_file (int i)
331 if (n_this_object_header_files == n_allocated_this_object_header_files)
333 n_allocated_this_object_header_files *= 2;
334 this_object_header_files
335 = (int *) xrealloc ((char *) this_object_header_files,
336 n_allocated_this_object_header_files * sizeof (int));
339 this_object_header_files[n_this_object_header_files++] = i;
342 /* Add to this file an "old" header file, one already seen in
343 a previous object file. NAME is the header file's name.
344 INSTANCE is its instance code, to select among multiple
345 symbol tables for the same header file. */
347 static void
348 add_old_header_file (const char *name, int instance)
350 struct header_file *p = HEADER_FILES (dbxread_objfile);
351 int i;
353 for (i = 0; i < N_HEADER_FILES (dbxread_objfile); i++)
354 if (filename_cmp (p[i].name, name) == 0 && instance == p[i].instance)
356 add_this_object_header_file (i);
357 return;
359 repeated_header_complaint (name, symnum);
362 /* Add to this file a "new" header file: definitions for its types follow.
363 NAME is the header file's name.
364 Most often this happens only once for each distinct header file,
365 but not necessarily. If it happens more than once, INSTANCE has
366 a different value each time, and references to the header file
367 use INSTANCE values to select among them.
369 dbx output contains "begin" and "end" markers for each new header file,
370 but at this level we just need to know which files there have been;
371 so we record the file when its "begin" is seen and ignore the "end". */
373 static void
374 add_new_header_file (const char *name, int instance)
376 int i;
377 struct header_file *hfile;
379 /* Make sure there is room for one more header file. */
381 i = N_ALLOCATED_HEADER_FILES (dbxread_objfile);
383 if (N_HEADER_FILES (dbxread_objfile) == i)
385 if (i == 0)
387 N_ALLOCATED_HEADER_FILES (dbxread_objfile) = 10;
388 HEADER_FILES (dbxread_objfile) = (struct header_file *)
389 xmalloc (10 * sizeof (struct header_file));
391 else
393 i *= 2;
394 N_ALLOCATED_HEADER_FILES (dbxread_objfile) = i;
395 HEADER_FILES (dbxread_objfile) = (struct header_file *)
396 xrealloc ((char *) HEADER_FILES (dbxread_objfile),
397 (i * sizeof (struct header_file)));
401 /* Create an entry for this header file. */
403 i = N_HEADER_FILES (dbxread_objfile)++;
404 hfile = HEADER_FILES (dbxread_objfile) + i;
405 hfile->name = xstrdup (name);
406 hfile->instance = instance;
407 hfile->length = 10;
408 hfile->vector = XCNEWVEC (struct type *, 10);
410 add_this_object_header_file (i);
413 #if 0
414 static struct type **
415 explicit_lookup_type (int real_filenum, int index)
417 struct header_file *f = &HEADER_FILES (dbxread_objfile)[real_filenum];
419 if (index >= f->length)
421 f->length *= 2;
422 f->vector = (struct type **)
423 xrealloc (f->vector, f->length * sizeof (struct type *));
424 memset (&f->vector[f->length / 2],
425 '\0', f->length * sizeof (struct type *) / 2);
427 return &f->vector[index];
429 #endif
431 static void
432 record_minimal_symbol (minimal_symbol_reader &reader,
433 const char *name, CORE_ADDR address, int type,
434 struct objfile *objfile)
436 enum minimal_symbol_type ms_type;
437 int section;
439 switch (type)
441 case N_TEXT | N_EXT:
442 ms_type = mst_text;
443 section = SECT_OFF_TEXT (objfile);
444 break;
445 case N_DATA | N_EXT:
446 ms_type = mst_data;
447 section = SECT_OFF_DATA (objfile);
448 break;
449 case N_BSS | N_EXT:
450 ms_type = mst_bss;
451 section = SECT_OFF_BSS (objfile);
452 break;
453 case N_ABS | N_EXT:
454 ms_type = mst_abs;
455 section = -1;
456 break;
457 #ifdef N_SETV
458 case N_SETV | N_EXT:
459 ms_type = mst_data;
460 section = SECT_OFF_DATA (objfile);
461 break;
462 case N_SETV:
463 /* I don't think this type actually exists; since a N_SETV is the result
464 of going over many .o files, it doesn't make sense to have one
465 file local. */
466 ms_type = mst_file_data;
467 section = SECT_OFF_DATA (objfile);
468 break;
469 #endif
470 case N_TEXT:
471 case N_NBTEXT:
472 case N_FN:
473 case N_FN_SEQ:
474 ms_type = mst_file_text;
475 section = SECT_OFF_TEXT (objfile);
476 break;
477 case N_DATA:
478 ms_type = mst_file_data;
480 /* Check for __DYNAMIC, which is used by Sun shared libraries.
481 Record it as global even if it's local, not global, so
482 lookup_minimal_symbol can find it. We don't check symbol_leading_char
483 because for SunOS4 it always is '_'. */
484 if (name[8] == 'C' && strcmp ("__DYNAMIC", name) == 0)
485 ms_type = mst_data;
487 /* Same with virtual function tables, both global and static. */
489 const char *tempstring = name;
491 if (tempstring[0] == bfd_get_symbol_leading_char (objfile->obfd))
492 ++tempstring;
493 if (is_vtable_name (tempstring))
494 ms_type = mst_data;
496 section = SECT_OFF_DATA (objfile);
497 break;
498 case N_BSS:
499 ms_type = mst_file_bss;
500 section = SECT_OFF_BSS (objfile);
501 break;
502 default:
503 ms_type = mst_unknown;
504 section = -1;
505 break;
508 if ((ms_type == mst_file_text || ms_type == mst_text)
509 && address < lowest_text_address)
510 lowest_text_address = address;
512 reader.record_with_info (name, address, ms_type, section);
515 /* Scan and build partial symbols for a symbol file.
516 We have been initialized by a call to dbx_symfile_init, which
517 put all the relevant info into a "struct dbx_symfile_info",
518 hung off the objfile structure. */
520 static void
521 dbx_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
523 bfd *sym_bfd;
524 int val;
526 sym_bfd = objfile->obfd;
528 /* .o and .nlm files are relocatables with text, data and bss segs based at
529 0. This flag disables special (Solaris stabs-in-elf only) fixups for
530 symbols with a value of 0. */
532 symfile_relocatable = bfd_get_file_flags (sym_bfd) & HAS_RELOC;
534 val = bfd_seek (sym_bfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET);
535 if (val < 0)
536 perror_with_name (objfile_name (objfile));
538 /* Size the symbol table. */
539 init_psymbol_list (objfile, DBX_SYMCOUNT (objfile));
541 symbol_size = DBX_SYMBOL_SIZE (objfile);
542 symbol_table_offset = DBX_SYMTAB_OFFSET (objfile);
544 scoped_free_pendings free_pending;
546 minimal_symbol_reader reader (objfile);
548 /* Read stabs data from executable file and define symbols. */
550 read_dbx_symtab (reader, objfile);
552 /* Install any minimal symbols that have been collected as the current
553 minimal symbols for this objfile. */
555 reader.install ();
558 /* Initialize anything that needs initializing when a completely new
559 symbol file is specified (not just adding some symbols from another
560 file, e.g. a shared library). */
562 static void
563 dbx_new_init (struct objfile *ignore)
565 stabsread_new_init ();
566 init_header_files ();
570 /* dbx_symfile_init ()
571 is the dbx-specific initialization routine for reading symbols.
572 It is passed a struct objfile which contains, among other things,
573 the BFD for the file whose symbols are being read, and a slot for a pointer
574 to "private data" which we fill with goodies.
576 We read the string table into malloc'd space and stash a pointer to it.
578 Since BFD doesn't know how to read debug symbols in a format-independent
579 way (and may never do so...), we have to do it ourselves. We will never
580 be called unless this is an a.out (or very similar) file.
581 FIXME, there should be a cleaner peephole into the BFD environment here. */
583 #define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */
585 static void
586 dbx_symfile_init (struct objfile *objfile)
588 int val;
589 bfd *sym_bfd = objfile->obfd;
590 const char *name = bfd_get_filename (sym_bfd);
591 asection *text_sect;
592 unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE];
594 /* Allocate struct to keep track of the symfile. */
595 dbx_objfile_data_key.emplace (objfile);
597 DBX_TEXT_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
598 DBX_DATA_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".data");
599 DBX_BSS_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".bss");
601 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */
602 #define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd))
603 #define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd))
605 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */
607 text_sect = bfd_get_section_by_name (sym_bfd, ".text");
608 if (!text_sect)
609 error (_("Can't find .text section in symbol file"));
610 DBX_TEXT_ADDR (objfile) = bfd_section_vma (text_sect);
611 DBX_TEXT_SIZE (objfile) = bfd_section_size (text_sect);
613 DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd);
614 DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd);
615 DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
617 /* Read the string table and stash it away in the objfile_obstack.
618 When we blow away the objfile the string table goes away as well.
619 Note that gdb used to use the results of attempting to malloc the
620 string table, based on the size it read, as a form of sanity check
621 for botched byte swapping, on the theory that a byte swapped string
622 table size would be so totally bogus that the malloc would fail. Now
623 that we put in on the objfile_obstack, we can't do this since gdb gets
624 a fatal error (out of virtual memory) if the size is bogus. We can
625 however at least check to see if the size is less than the size of
626 the size field itself, or larger than the size of the entire file.
627 Note that all valid string tables have a size greater than zero, since
628 the bytes used to hold the size are included in the count. */
630 if (STRING_TABLE_OFFSET == 0)
632 /* It appears that with the existing bfd code, STRING_TABLE_OFFSET
633 will never be zero, even when there is no string table. This
634 would appear to be a bug in bfd. */
635 DBX_STRINGTAB_SIZE (objfile) = 0;
636 DBX_STRINGTAB (objfile) = NULL;
638 else
640 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
641 if (val < 0)
642 perror_with_name (name);
644 memset (size_temp, 0, sizeof (size_temp));
645 val = bfd_bread (size_temp, sizeof (size_temp), sym_bfd);
646 if (val < 0)
648 perror_with_name (name);
650 else if (val == 0)
652 /* With the existing bfd code, STRING_TABLE_OFFSET will be set to
653 EOF if there is no string table, and attempting to read the size
654 from EOF will read zero bytes. */
655 DBX_STRINGTAB_SIZE (objfile) = 0;
656 DBX_STRINGTAB (objfile) = NULL;
658 else
660 /* Read some data that would appear to be the string table size.
661 If there really is a string table, then it is probably the right
662 size. Byteswap if necessary and validate the size. Note that
663 the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some
664 random data that happened to be at STRING_TABLE_OFFSET, because
665 bfd can't tell us there is no string table, the sanity checks may
666 or may not catch this. */
667 DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp);
669 if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp)
670 || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
671 error (_("ridiculous string table size (%d bytes)."),
672 DBX_STRINGTAB_SIZE (objfile));
674 DBX_STRINGTAB (objfile) =
675 (char *) obstack_alloc (&objfile->objfile_obstack,
676 DBX_STRINGTAB_SIZE (objfile));
677 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile));
679 /* Now read in the string table in one big gulp. */
681 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
682 if (val < 0)
683 perror_with_name (name);
684 val = bfd_bread (DBX_STRINGTAB (objfile),
685 DBX_STRINGTAB_SIZE (objfile),
686 sym_bfd);
687 if (val != DBX_STRINGTAB_SIZE (objfile))
688 perror_with_name (name);
693 /* Perform any local cleanups required when we are done with a particular
694 objfile. I.E, we are in the process of discarding all symbol information
695 for an objfile, freeing up all memory held for it, and unlinking the
696 objfile struct from the global list of known objfiles. */
698 static void
699 dbx_symfile_finish (struct objfile *objfile)
701 free_header_files ();
704 dbx_symfile_info::~dbx_symfile_info ()
706 if (header_files != NULL)
708 int i = n_header_files;
709 struct header_file *hfiles = header_files;
711 while (--i >= 0)
713 xfree (hfiles[i].name);
714 xfree (hfiles[i].vector);
716 xfree (hfiles);
722 /* Buffer for reading the symbol table entries. */
723 static struct external_nlist symbuf[4096];
724 static int symbuf_idx;
725 static int symbuf_end;
727 /* Name of last function encountered. Used in Solaris to approximate
728 object file boundaries. */
729 static const char *last_function_name;
731 /* The address in memory of the string table of the object file we are
732 reading (which might not be the "main" object file, but might be a
733 shared library or some other dynamically loaded thing). This is
734 set by read_dbx_symtab when building psymtabs, and by
735 read_ofile_symtab when building symtabs, and is used only by
736 next_symbol_text. FIXME: If that is true, we don't need it when
737 building psymtabs, right? */
738 static char *stringtab_global;
740 /* These variables are used to control fill_symbuf when the stabs
741 symbols are not contiguous (as may be the case when a COFF file is
742 linked using --split-by-reloc). */
743 static const std::vector<asection *> *symbuf_sections;
744 static size_t sect_idx;
745 static unsigned int symbuf_left;
746 static unsigned int symbuf_read;
748 /* This variable stores a global stabs buffer, if we read stabs into
749 memory in one chunk in order to process relocations. */
750 static bfd_byte *stabs_data;
752 /* Refill the symbol table input buffer
753 and set the variables that control fetching entries from it.
754 Reports an error if no data available.
755 This function can read past the end of the symbol table
756 (into the string table) but this does no harm. */
758 static void
759 fill_symbuf (bfd *sym_bfd)
761 unsigned int count;
762 int nbytes;
764 if (stabs_data)
766 nbytes = sizeof (symbuf);
767 if (nbytes > symbuf_left)
768 nbytes = symbuf_left;
769 memcpy (symbuf, stabs_data + symbuf_read, nbytes);
771 else if (symbuf_sections == NULL)
773 count = sizeof (symbuf);
774 nbytes = bfd_bread (symbuf, count, sym_bfd);
776 else
778 if (symbuf_left <= 0)
780 file_ptr filepos = (*symbuf_sections)[sect_idx]->filepos;
782 if (bfd_seek (sym_bfd, filepos, SEEK_SET) != 0)
783 perror_with_name (bfd_get_filename (sym_bfd));
784 symbuf_left = bfd_section_size ((*symbuf_sections)[sect_idx]);
785 symbol_table_offset = filepos - symbuf_read;
786 ++sect_idx;
789 count = symbuf_left;
790 if (count > sizeof (symbuf))
791 count = sizeof (symbuf);
792 nbytes = bfd_bread (symbuf, count, sym_bfd);
795 if (nbytes < 0)
796 perror_with_name (bfd_get_filename (sym_bfd));
797 else if (nbytes == 0)
798 error (_("Premature end of file reading symbol table"));
799 symbuf_end = nbytes / symbol_size;
800 symbuf_idx = 0;
801 symbuf_left -= nbytes;
802 symbuf_read += nbytes;
805 static void
806 stabs_seek (int sym_offset)
808 if (stabs_data)
810 symbuf_read += sym_offset;
811 symbuf_left -= sym_offset;
813 else
814 bfd_seek (symfile_bfd, sym_offset, SEEK_CUR);
817 #define INTERNALIZE_SYMBOL(intern, extern, abfd) \
819 (intern).n_strx = bfd_h_get_32 (abfd, (extern)->e_strx); \
820 (intern).n_type = bfd_h_get_8 (abfd, (extern)->e_type); \
821 (intern).n_other = 0; \
822 (intern).n_desc = bfd_h_get_16 (abfd, (extern)->e_desc); \
823 if (bfd_get_sign_extend_vma (abfd)) \
824 (intern).n_value = bfd_h_get_signed_32 (abfd, (extern)->e_value); \
825 else \
826 (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \
829 /* Invariant: The symbol pointed to by symbuf_idx is the first one
830 that hasn't been swapped. Swap the symbol at the same time
831 that symbuf_idx is incremented. */
833 /* dbx allows the text of a symbol name to be continued into the
834 next symbol name! When such a continuation is encountered
835 (a \ at the end of the text of a name)
836 call this function to get the continuation. */
838 static const char *
839 dbx_next_symbol_text (struct objfile *objfile)
841 struct internal_nlist nlist;
843 if (symbuf_idx == symbuf_end)
844 fill_symbuf (symfile_bfd);
846 symnum++;
847 INTERNALIZE_SYMBOL (nlist, &symbuf[symbuf_idx], symfile_bfd);
848 OBJSTAT (objfile, n_stabs++);
850 symbuf_idx++;
852 return nlist.n_strx + stringtab_global + file_string_table_offset;
856 /* Given a name, value pair, find the corresponding
857 bincl in the list. Return the partial symtab associated
858 with that header_file_location. */
860 static legacy_psymtab *
861 find_corresponding_bincl_psymtab (const char *name, int instance)
863 for (const header_file_location &bincl : *bincl_list)
864 if (bincl.instance == instance
865 && strcmp (name, bincl.name) == 0)
866 return bincl.pst;
868 repeated_header_complaint (name, symnum);
869 return (legacy_psymtab *) 0;
872 /* Set namestring based on nlist. If the string table index is invalid,
873 give a fake name, and print a single error message per symbol file read,
874 rather than abort the symbol reading or flood the user with messages. */
876 static const char *
877 set_namestring (struct objfile *objfile, const struct internal_nlist *nlist)
879 const char *namestring;
881 if (nlist->n_strx + file_string_table_offset
882 >= DBX_STRINGTAB_SIZE (objfile)
883 || nlist->n_strx + file_string_table_offset < nlist->n_strx)
885 complaint (_("bad string table offset in symbol %d"),
886 symnum);
887 namestring = "<bad string table offset>";
889 else
890 namestring = (nlist->n_strx + file_string_table_offset
891 + DBX_STRINGTAB (objfile));
892 return namestring;
895 static struct bound_minimal_symbol
896 find_stab_function (const char *namestring, const char *filename,
897 struct objfile *objfile)
899 struct bound_minimal_symbol msym;
900 int n;
902 const char *colon = strchr (namestring, ':');
903 if (colon == NULL)
904 n = 0;
905 else
906 n = colon - namestring;
908 char *p = (char *) alloca (n + 2);
909 strncpy (p, namestring, n);
910 p[n] = 0;
912 msym = lookup_minimal_symbol (p, filename, objfile);
913 if (msym.minsym == NULL)
915 /* Sun Fortran appends an underscore to the minimal symbol name,
916 try again with an appended underscore if the minimal symbol
917 was not found. */
918 p[n] = '_';
919 p[n + 1] = 0;
920 msym = lookup_minimal_symbol (p, filename, objfile);
923 if (msym.minsym == NULL && filename != NULL)
925 /* Try again without the filename. */
926 p[n] = 0;
927 msym = lookup_minimal_symbol (p, NULL, objfile);
929 if (msym.minsym == NULL && filename != NULL)
931 /* And try again for Sun Fortran, but without the filename. */
932 p[n] = '_';
933 p[n + 1] = 0;
934 msym = lookup_minimal_symbol (p, NULL, objfile);
937 return msym;
940 static void
941 function_outside_compilation_unit_complaint (const char *arg1)
943 complaint (_("function `%s' appears to be defined "
944 "outside of all compilation units"),
945 arg1);
948 /* Setup partial_symtab's describing each source file for which
949 debugging information is available. */
951 static void
952 read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
954 struct gdbarch *gdbarch = get_objfile_arch (objfile);
955 struct external_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch. */
956 struct internal_nlist nlist;
957 CORE_ADDR text_addr;
958 int text_size;
959 const char *sym_name;
960 int sym_len;
962 const char *namestring;
963 int nsl;
964 int past_first_source_file = 0;
965 CORE_ADDR last_function_start = 0;
966 bfd *abfd;
967 int textlow_not_set;
968 int data_sect_index;
970 /* Current partial symtab. */
971 legacy_psymtab *pst;
973 /* List of current psymtab's include files. */
974 const char **psymtab_include_list;
975 int includes_allocated;
976 int includes_used;
978 /* Index within current psymtab dependency list. */
979 legacy_psymtab **dependency_list;
980 int dependencies_used, dependencies_allocated;
982 text_addr = DBX_TEXT_ADDR (objfile);
983 text_size = DBX_TEXT_SIZE (objfile);
985 /* FIXME. We probably want to change stringtab_global rather than add this
986 while processing every symbol entry. FIXME. */
987 file_string_table_offset = 0;
988 next_file_string_table_offset = 0;
990 stringtab_global = DBX_STRINGTAB (objfile);
992 pst = (legacy_psymtab *) 0;
994 includes_allocated = 30;
995 includes_used = 0;
996 psymtab_include_list = (const char **) alloca (includes_allocated *
997 sizeof (const char *));
999 dependencies_allocated = 30;
1000 dependencies_used = 0;
1001 dependency_list =
1002 (legacy_psymtab **) alloca (dependencies_allocated *
1003 sizeof (legacy_psymtab *));
1005 /* Init bincl list */
1006 std::vector<struct header_file_location> bincl_storage;
1007 scoped_restore restore_bincl_global
1008 = make_scoped_restore (&bincl_list, &bincl_storage);
1010 set_last_source_file (NULL);
1012 lowest_text_address = (CORE_ADDR) -1;
1014 symfile_bfd = objfile->obfd; /* For next_text_symbol. */
1015 abfd = objfile->obfd;
1016 symbuf_end = symbuf_idx = 0;
1017 next_symbol_text_func = dbx_next_symbol_text;
1018 textlow_not_set = 1;
1019 has_line_numbers = 0;
1021 /* FIXME: jimb/2003-09-12: We don't apply the right section's offset
1022 to global and static variables. The stab for a global or static
1023 variable doesn't give us any indication of which section it's in,
1024 so we can't tell immediately which offset in
1025 objfile->section_offsets we should apply to the variable's
1026 address.
1028 We could certainly find out which section contains the variable
1029 by looking up the variable's unrelocated address with
1030 find_pc_section, but that would be expensive; this is the
1031 function that constructs the partial symbol tables by examining
1032 every symbol in the entire executable, and it's
1033 performance-critical. So that expense would not be welcome. I'm
1034 not sure what to do about this at the moment.
1036 What we have done for years is to simply assume that the .data
1037 section's offset is appropriate for all global and static
1038 variables. Recently, this was expanded to fall back to the .bss
1039 section's offset if there is no .data section, and then to the
1040 .rodata section's offset. */
1041 data_sect_index = objfile->sect_index_data;
1042 if (data_sect_index == -1)
1043 data_sect_index = SECT_OFF_BSS (objfile);
1044 if (data_sect_index == -1)
1045 data_sect_index = SECT_OFF_RODATA (objfile);
1047 /* If data_sect_index is still -1, that's okay. It's perfectly fine
1048 for the file to have no .data, no .bss, and no .text at all, if
1049 it also has no global or static variables. */
1051 for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++)
1053 /* Get the symbol for this run and pull out some info. */
1054 QUIT; /* Allow this to be interruptable. */
1055 if (symbuf_idx == symbuf_end)
1056 fill_symbuf (abfd);
1057 bufp = &symbuf[symbuf_idx++];
1060 * Special case to speed up readin.
1062 if (bfd_h_get_8 (abfd, bufp->e_type) == N_SLINE)
1064 has_line_numbers = 1;
1065 continue;
1068 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
1069 OBJSTAT (objfile, n_stabs++);
1071 /* Ok. There is a lot of code duplicated in the rest of this
1072 switch statement (for efficiency reasons). Since I don't
1073 like duplicating code, I will do my penance here, and
1074 describe the code which is duplicated:
1076 *) The assignment to namestring.
1077 *) The call to strchr.
1078 *) The addition of a partial symbol the two partial
1079 symbol lists. This last is a large section of code, so
1080 I've imbedded it in the following macro. */
1082 switch (nlist.n_type)
1085 * Standard, external, non-debugger, symbols
1088 case N_TEXT | N_EXT:
1089 case N_NBTEXT | N_EXT:
1090 goto record_it;
1092 case N_DATA | N_EXT:
1093 case N_NBDATA | N_EXT:
1094 goto record_it;
1096 case N_BSS:
1097 case N_BSS | N_EXT:
1098 case N_NBBSS | N_EXT:
1099 case N_SETV | N_EXT: /* FIXME, is this in BSS? */
1100 goto record_it;
1102 case N_ABS | N_EXT:
1103 record_it:
1104 namestring = set_namestring (objfile, &nlist);
1106 record_minimal_symbol (reader, namestring, nlist.n_value,
1107 nlist.n_type, objfile); /* Always */
1108 continue;
1110 /* Standard, local, non-debugger, symbols. */
1112 case N_NBTEXT:
1114 /* We need to be able to deal with both N_FN or N_TEXT,
1115 because we have no way of knowing whether the sys-supplied ld
1116 or GNU ld was used to make the executable. Sequents throw
1117 in another wrinkle -- they renumbered N_FN. */
1119 case N_FN:
1120 case N_FN_SEQ:
1121 case N_TEXT:
1122 namestring = set_namestring (objfile, &nlist);
1124 if ((namestring[0] == '-' && namestring[1] == 'l')
1125 || (namestring[(nsl = strlen (namestring)) - 1] == 'o'
1126 && namestring[nsl - 2] == '.'))
1128 if (past_first_source_file && pst
1129 /* The gould NP1 uses low values for .o and -l symbols
1130 which are not the address. */
1131 && nlist.n_value >= pst->raw_text_low ())
1133 dbx_end_psymtab (objfile, pst, psymtab_include_list,
1134 includes_used, symnum * symbol_size,
1135 nlist.n_value > pst->raw_text_high ()
1136 ? nlist.n_value : pst->raw_text_high (),
1137 dependency_list, dependencies_used,
1138 textlow_not_set);
1139 pst = (legacy_psymtab *) 0;
1140 includes_used = 0;
1141 dependencies_used = 0;
1142 has_line_numbers = 0;
1144 else
1145 past_first_source_file = 1;
1147 else
1148 goto record_it;
1149 continue;
1151 case N_DATA:
1152 goto record_it;
1154 case N_UNDF | N_EXT:
1155 /* The case (nlist.n_value != 0) is a "Fortran COMMON" symbol.
1156 We used to rely on the target to tell us whether it knows
1157 where the symbol has been relocated to, but none of the
1158 target implementations actually provided that operation.
1159 So we just ignore the symbol, the same way we would do if
1160 we had a target-side symbol lookup which returned no match.
1162 All other symbols (with nlist.n_value == 0), are really
1163 undefined, and so we ignore them too. */
1164 continue;
1166 case N_UNDF:
1167 if (processing_acc_compilation && nlist.n_strx == 1)
1169 /* Deal with relative offsets in the string table
1170 used in ELF+STAB under Solaris. If we want to use the
1171 n_strx field, which contains the name of the file,
1172 we must adjust file_string_table_offset *before* calling
1173 set_namestring(). */
1174 past_first_source_file = 1;
1175 file_string_table_offset = next_file_string_table_offset;
1176 next_file_string_table_offset =
1177 file_string_table_offset + nlist.n_value;
1178 if (next_file_string_table_offset < file_string_table_offset)
1179 error (_("string table offset backs up at %d"), symnum);
1180 /* FIXME -- replace error() with complaint. */
1181 continue;
1183 continue;
1185 /* Lots of symbol types we can just ignore. */
1187 case N_ABS:
1188 case N_NBDATA:
1189 case N_NBBSS:
1190 continue;
1192 /* Keep going . . . */
1195 * Special symbol types for GNU
1197 case N_INDR:
1198 case N_INDR | N_EXT:
1199 case N_SETA:
1200 case N_SETA | N_EXT:
1201 case N_SETT:
1202 case N_SETT | N_EXT:
1203 case N_SETD:
1204 case N_SETD | N_EXT:
1205 case N_SETB:
1206 case N_SETB | N_EXT:
1207 case N_SETV:
1208 continue;
1211 * Debugger symbols
1214 case N_SO:
1216 CORE_ADDR valu;
1217 static int prev_so_symnum = -10;
1218 static int first_so_symnum;
1219 const char *p;
1220 static const char *dirname_nso;
1221 int prev_textlow_not_set;
1223 valu = nlist.n_value;
1225 prev_textlow_not_set = textlow_not_set;
1227 /* A zero value is probably an indication for the SunPRO 3.0
1228 compiler. dbx_end_psymtab explicitly tests for zero, so
1229 don't relocate it. */
1231 if (nlist.n_value == 0
1232 && gdbarch_sofun_address_maybe_missing (gdbarch))
1234 textlow_not_set = 1;
1235 valu = 0;
1237 else
1238 textlow_not_set = 0;
1240 past_first_source_file = 1;
1242 if (prev_so_symnum != symnum - 1)
1243 { /* Here if prev stab wasn't N_SO. */
1244 first_so_symnum = symnum;
1246 if (pst)
1248 dbx_end_psymtab (objfile, pst, psymtab_include_list,
1249 includes_used, symnum * symbol_size,
1250 (valu > pst->raw_text_high ()
1251 ? valu : pst->raw_text_high ()),
1252 dependency_list, dependencies_used,
1253 prev_textlow_not_set);
1254 pst = (legacy_psymtab *) 0;
1255 includes_used = 0;
1256 dependencies_used = 0;
1257 has_line_numbers = 0;
1261 prev_so_symnum = symnum;
1263 /* End the current partial symtab and start a new one. */
1265 namestring = set_namestring (objfile, &nlist);
1267 /* Null name means end of .o file. Don't start a new one. */
1268 if (*namestring == '\000')
1269 continue;
1271 /* Some compilers (including gcc) emit a pair of initial N_SOs.
1272 The first one is a directory name; the second the file name.
1273 If pst exists, is empty, and has a filename ending in '/',
1274 we assume the previous N_SO was a directory name. */
1276 p = lbasename (namestring);
1277 if (p != namestring && *p == '\000')
1279 /* Save the directory name SOs locally, then save it into
1280 the psymtab when it's created below. */
1281 dirname_nso = namestring;
1282 continue;
1285 /* Some other compilers (C++ ones in particular) emit useless
1286 SOs for non-existant .c files. We ignore all subsequent SOs
1287 that immediately follow the first. */
1289 if (!pst)
1291 pst = start_psymtab (objfile,
1292 namestring, valu,
1293 first_so_symnum * symbol_size);
1294 pst->dirname = dirname_nso;
1295 dirname_nso = NULL;
1297 continue;
1300 case N_BINCL:
1302 enum language tmp_language;
1304 /* Add this bincl to the bincl_list for future EXCLs. No
1305 need to save the string; it'll be around until
1306 read_dbx_symtab function returns. */
1308 namestring = set_namestring (objfile, &nlist);
1309 tmp_language = deduce_language_from_filename (namestring);
1311 /* Only change the psymtab's language if we've learned
1312 something useful (eg. tmp_language is not language_unknown).
1313 In addition, to match what start_subfile does, never change
1314 from C++ to C. */
1315 if (tmp_language != language_unknown
1316 && (tmp_language != language_c
1317 || psymtab_language != language_cplus))
1318 psymtab_language = tmp_language;
1320 if (pst == NULL)
1322 /* FIXME: we should not get here without a PST to work on.
1323 Attempt to recover. */
1324 complaint (_("N_BINCL %s not in entries for "
1325 "any file, at symtab pos %d"),
1326 namestring, symnum);
1327 continue;
1329 bincl_list->emplace_back (namestring, nlist.n_value, pst);
1331 /* Mark down an include file in the current psymtab. */
1333 goto record_include_file;
1336 case N_SOL:
1338 enum language tmp_language;
1340 /* Mark down an include file in the current psymtab. */
1341 namestring = set_namestring (objfile, &nlist);
1342 tmp_language = deduce_language_from_filename (namestring);
1344 /* Only change the psymtab's language if we've learned
1345 something useful (eg. tmp_language is not language_unknown).
1346 In addition, to match what start_subfile does, never change
1347 from C++ to C. */
1348 if (tmp_language != language_unknown
1349 && (tmp_language != language_c
1350 || psymtab_language != language_cplus))
1351 psymtab_language = tmp_language;
1353 /* In C++, one may expect the same filename to come round many
1354 times, when code is coming alternately from the main file
1355 and from inline functions in other files. So I check to see
1356 if this is a file we've seen before -- either the main
1357 source file, or a previously included file.
1359 This seems to be a lot of time to be spending on N_SOL, but
1360 things like "break c-exp.y:435" need to work (I
1361 suppose the psymtab_include_list could be hashed or put
1362 in a binary tree, if profiling shows this is a major hog). */
1363 if (pst && filename_cmp (namestring, pst->filename) == 0)
1364 continue;
1366 int i;
1368 for (i = 0; i < includes_used; i++)
1369 if (filename_cmp (namestring, psymtab_include_list[i]) == 0)
1371 i = -1;
1372 break;
1374 if (i == -1)
1375 continue;
1378 record_include_file:
1380 psymtab_include_list[includes_used++] = namestring;
1381 if (includes_used >= includes_allocated)
1383 const char **orig = psymtab_include_list;
1385 psymtab_include_list = (const char **)
1386 alloca ((includes_allocated *= 2) * sizeof (const char *));
1387 memcpy (psymtab_include_list, orig,
1388 includes_used * sizeof (const char *));
1390 continue;
1392 case N_LSYM: /* Typedef or automatic variable. */
1393 case N_STSYM: /* Data seg var -- static. */
1394 case N_LCSYM: /* BSS " */
1395 case N_ROSYM: /* Read-only data seg var -- static. */
1396 case N_NBSTS: /* Gould nobase. */
1397 case N_NBLCS: /* symbols. */
1398 case N_FUN:
1399 case N_GSYM: /* Global (extern) variable; can be
1400 data or bss (sigh FIXME). */
1402 /* Following may probably be ignored; I'll leave them here
1403 for now (until I do Pascal and Modula 2 extensions). */
1405 case N_PC: /* I may or may not need this; I
1406 suspect not. */
1407 case N_M2C: /* I suspect that I can ignore this here. */
1408 case N_SCOPE: /* Same. */
1410 const char *p;
1412 namestring = set_namestring (objfile, &nlist);
1414 /* See if this is an end of function stab. */
1415 if (pst && nlist.n_type == N_FUN && *namestring == '\000')
1417 CORE_ADDR valu;
1419 /* It's value is the size (in bytes) of the function for
1420 function relative stabs, or the address of the function's
1421 end for old style stabs. */
1422 valu = nlist.n_value + last_function_start;
1423 if (pst->raw_text_high () == 0 || valu > pst->raw_text_high ())
1424 pst->set_text_high (valu);
1425 break;
1428 p = (char *) strchr (namestring, ':');
1429 if (!p)
1430 continue; /* Not a debugging symbol. */
1432 sym_len = 0;
1433 sym_name = NULL; /* pacify "gcc -Werror" */
1434 if (psymtab_language == language_cplus)
1436 std::string name (namestring, p - namestring);
1437 std::string new_name = cp_canonicalize_string (name.c_str ());
1438 if (!new_name.empty ())
1440 sym_len = new_name.length ();
1441 sym_name = obstack_strdup (&objfile->objfile_obstack,
1442 new_name);
1446 if (sym_len == 0)
1448 sym_name = namestring;
1449 sym_len = p - namestring;
1452 /* Main processing section for debugging symbols which
1453 the initial read through the symbol tables needs to worry
1454 about. If we reach this point, the symbol which we are
1455 considering is definitely one we are interested in.
1456 p must also contain the (valid) index into the namestring
1457 which indicates the debugging type symbol. */
1459 switch (p[1])
1461 case 'S':
1462 if (gdbarch_static_transform_name_p (gdbarch))
1463 gdbarch_static_transform_name (gdbarch, namestring);
1465 add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
1466 VAR_DOMAIN, LOC_STATIC,
1467 data_sect_index,
1468 psymbol_placement::STATIC,
1469 nlist.n_value, psymtab_language, objfile);
1470 continue;
1472 case 'G':
1473 /* The addresses in these entries are reported to be
1474 wrong. See the code that reads 'G's for symtabs. */
1475 add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
1476 VAR_DOMAIN, LOC_STATIC,
1477 data_sect_index,
1478 psymbol_placement::GLOBAL,
1479 nlist.n_value, psymtab_language, objfile);
1480 continue;
1482 case 'T':
1483 /* When a 'T' entry is defining an anonymous enum, it
1484 may have a name which is the empty string, or a
1485 single space. Since they're not really defining a
1486 symbol, those shouldn't go in the partial symbol
1487 table. We do pick up the elements of such enums at
1488 'check_enum:', below. */
1489 if (p >= namestring + 2
1490 || (p == namestring + 1
1491 && namestring[0] != ' '))
1493 add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
1494 true, STRUCT_DOMAIN, LOC_TYPEDEF, -1,
1495 psymbol_placement::STATIC,
1496 0, psymtab_language, objfile);
1497 if (p[2] == 't')
1499 /* Also a typedef with the same name. */
1500 add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
1501 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
1502 psymbol_placement::STATIC,
1503 0, psymtab_language, objfile);
1504 p += 1;
1507 goto check_enum;
1509 case 't':
1510 if (p != namestring) /* a name is there, not just :T... */
1512 add_psymbol_to_list (gdb::string_view (sym_name, sym_len),
1513 true, VAR_DOMAIN, LOC_TYPEDEF, -1,
1514 psymbol_placement::STATIC,
1515 0, psymtab_language, objfile);
1517 check_enum:
1518 /* If this is an enumerated type, we need to
1519 add all the enum constants to the partial symbol
1520 table. This does not cover enums without names, e.g.
1521 "enum {a, b} c;" in C, but fortunately those are
1522 rare. There is no way for GDB to find those from the
1523 enum type without spending too much time on it. Thus
1524 to solve this problem, the compiler needs to put out the
1525 enum in a nameless type. GCC2 does this. */
1527 /* We are looking for something of the form
1528 <name> ":" ("t" | "T") [<number> "="] "e"
1529 {<constant> ":" <value> ","} ";". */
1531 /* Skip over the colon and the 't' or 'T'. */
1532 p += 2;
1533 /* This type may be given a number. Also, numbers can come
1534 in pairs like (0,26). Skip over it. */
1535 while ((*p >= '0' && *p <= '9')
1536 || *p == '(' || *p == ',' || *p == ')'
1537 || *p == '=')
1538 p++;
1540 if (*p++ == 'e')
1542 /* The aix4 compiler emits extra crud before the members. */
1543 if (*p == '-')
1545 /* Skip over the type (?). */
1546 while (*p != ':')
1547 p++;
1549 /* Skip over the colon. */
1550 p++;
1553 /* We have found an enumerated type. */
1554 /* According to comments in read_enum_type
1555 a comma could end it instead of a semicolon.
1556 I don't know where that happens.
1557 Accept either. */
1558 while (*p && *p != ';' && *p != ',')
1560 const char *q;
1562 /* Check for and handle cretinous dbx symbol name
1563 continuation! */
1564 if (*p == '\\' || (*p == '?' && p[1] == '\0'))
1565 p = next_symbol_text (objfile);
1567 /* Point to the character after the name
1568 of the enum constant. */
1569 for (q = p; *q && *q != ':'; q++)
1571 /* Note that the value doesn't matter for
1572 enum constants in psymtabs, just in symtabs. */
1573 add_psymbol_to_list (gdb::string_view (p, q - p), true,
1574 VAR_DOMAIN, LOC_CONST, -1,
1575 psymbol_placement::STATIC, 0,
1576 psymtab_language, objfile);
1577 /* Point past the name. */
1578 p = q;
1579 /* Skip over the value. */
1580 while (*p && *p != ',')
1581 p++;
1582 /* Advance past the comma. */
1583 if (*p)
1584 p++;
1587 continue;
1589 case 'c':
1590 /* Constant, e.g. from "const" in Pascal. */
1591 add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
1592 VAR_DOMAIN, LOC_CONST, -1,
1593 psymbol_placement::STATIC, 0,
1594 psymtab_language, objfile);
1595 continue;
1597 case 'f':
1598 if (! pst)
1600 int name_len = p - namestring;
1601 char *name = (char *) xmalloc (name_len + 1);
1603 memcpy (name, namestring, name_len);
1604 name[name_len] = '\0';
1605 function_outside_compilation_unit_complaint (name);
1606 xfree (name);
1608 /* Kludges for ELF/STABS with Sun ACC. */
1609 last_function_name = namestring;
1610 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
1611 value for the bottom of the text seg in those cases. */
1612 if (nlist.n_value == 0
1613 && gdbarch_sofun_address_maybe_missing (gdbarch))
1615 struct bound_minimal_symbol minsym
1616 = find_stab_function (namestring,
1617 pst ? pst->filename : NULL,
1618 objfile);
1619 if (minsym.minsym != NULL)
1620 nlist.n_value = MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym);
1622 if (pst && textlow_not_set
1623 && gdbarch_sofun_address_maybe_missing (gdbarch))
1625 pst->set_text_low (nlist.n_value);
1626 textlow_not_set = 0;
1628 /* End kludge. */
1630 /* Keep track of the start of the last function so we
1631 can handle end of function symbols. */
1632 last_function_start = nlist.n_value;
1634 /* In reordered executables this function may lie outside
1635 the bounds created by N_SO symbols. If that's the case
1636 use the address of this function as the low bound for
1637 the partial symbol table. */
1638 if (pst
1639 && (textlow_not_set
1640 || (nlist.n_value < pst->raw_text_low ()
1641 && (nlist.n_value != 0))))
1643 pst->set_text_low (nlist.n_value);
1644 textlow_not_set = 0;
1646 add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
1647 VAR_DOMAIN, LOC_BLOCK,
1648 SECT_OFF_TEXT (objfile),
1649 psymbol_placement::STATIC,
1650 nlist.n_value, psymtab_language, objfile);
1651 continue;
1653 /* Global functions were ignored here, but now they
1654 are put into the global psymtab like one would expect.
1655 They're also in the minimal symbol table. */
1656 case 'F':
1657 if (! pst)
1659 int name_len = p - namestring;
1660 char *name = (char *) xmalloc (name_len + 1);
1662 memcpy (name, namestring, name_len);
1663 name[name_len] = '\0';
1664 function_outside_compilation_unit_complaint (name);
1665 xfree (name);
1667 /* Kludges for ELF/STABS with Sun ACC. */
1668 last_function_name = namestring;
1669 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
1670 value for the bottom of the text seg in those cases. */
1671 if (nlist.n_value == 0
1672 && gdbarch_sofun_address_maybe_missing (gdbarch))
1674 struct bound_minimal_symbol minsym
1675 = find_stab_function (namestring,
1676 pst ? pst->filename : NULL,
1677 objfile);
1678 if (minsym.minsym != NULL)
1679 nlist.n_value = MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym);
1681 if (pst && textlow_not_set
1682 && gdbarch_sofun_address_maybe_missing (gdbarch))
1684 pst->set_text_low (nlist.n_value);
1685 textlow_not_set = 0;
1687 /* End kludge. */
1689 /* Keep track of the start of the last function so we
1690 can handle end of function symbols. */
1691 last_function_start = nlist.n_value;
1693 /* In reordered executables this function may lie outside
1694 the bounds created by N_SO symbols. If that's the case
1695 use the address of this function as the low bound for
1696 the partial symbol table. */
1697 if (pst
1698 && (textlow_not_set
1699 || (nlist.n_value < pst->raw_text_low ()
1700 && (nlist.n_value != 0))))
1702 pst->set_text_low (nlist.n_value);
1703 textlow_not_set = 0;
1705 add_psymbol_to_list (gdb::string_view (sym_name, sym_len), true,
1706 VAR_DOMAIN, LOC_BLOCK,
1707 SECT_OFF_TEXT (objfile),
1708 psymbol_placement::GLOBAL,
1709 nlist.n_value, psymtab_language, objfile);
1710 continue;
1712 /* Two things show up here (hopefully); static symbols of
1713 local scope (static used inside braces) or extensions
1714 of structure symbols. We can ignore both. */
1715 case 'V':
1716 case '(':
1717 case '0':
1718 case '1':
1719 case '2':
1720 case '3':
1721 case '4':
1722 case '5':
1723 case '6':
1724 case '7':
1725 case '8':
1726 case '9':
1727 case '-':
1728 case '#': /* For symbol identification (used in live ranges). */
1729 continue;
1731 case ':':
1732 /* It is a C++ nested symbol. We don't need to record it
1733 (I don't think); if we try to look up foo::bar::baz,
1734 then symbols for the symtab containing foo should get
1735 read in, I think. */
1736 /* Someone says sun cc puts out symbols like
1737 /foo/baz/maclib::/usr/local/bin/maclib,
1738 which would get here with a symbol type of ':'. */
1739 continue;
1741 default:
1742 /* Unexpected symbol descriptor. The second and subsequent stabs
1743 of a continued stab can show up here. The question is
1744 whether they ever can mimic a normal stab--it would be
1745 nice if not, since we certainly don't want to spend the
1746 time searching to the end of every string looking for
1747 a backslash. */
1749 complaint (_("unknown symbol descriptor `%c'"),
1750 p[1]);
1752 /* Ignore it; perhaps it is an extension that we don't
1753 know about. */
1754 continue;
1758 case N_EXCL:
1760 namestring = set_namestring (objfile, &nlist);
1762 /* Find the corresponding bincl and mark that psymtab on the
1763 psymtab dependency list. */
1765 legacy_psymtab *needed_pst =
1766 find_corresponding_bincl_psymtab (namestring, nlist.n_value);
1768 /* If this include file was defined earlier in this file,
1769 leave it alone. */
1770 if (needed_pst == pst)
1771 continue;
1773 if (needed_pst)
1775 int i;
1776 int found = 0;
1778 for (i = 0; i < dependencies_used; i++)
1779 if (dependency_list[i] == needed_pst)
1781 found = 1;
1782 break;
1785 /* If it's already in the list, skip the rest. */
1786 if (found)
1787 continue;
1789 dependency_list[dependencies_used++] = needed_pst;
1790 if (dependencies_used >= dependencies_allocated)
1792 legacy_psymtab **orig = dependency_list;
1794 dependency_list =
1795 (legacy_psymtab **)
1796 alloca ((dependencies_allocated *= 2)
1797 * sizeof (legacy_psymtab *));
1798 memcpy (dependency_list, orig,
1799 (dependencies_used
1800 * sizeof (legacy_psymtab *)));
1801 #ifdef DEBUG_INFO
1802 fprintf_unfiltered (gdb_stderr,
1803 "Had to reallocate "
1804 "dependency list.\n");
1805 fprintf_unfiltered (gdb_stderr,
1806 "New dependencies allocated: %d\n",
1807 dependencies_allocated);
1808 #endif
1812 continue;
1814 case N_ENDM:
1815 /* Solaris 2 end of module, finish current partial symbol
1816 table. dbx_end_psymtab will set the high text address of
1817 PST to the proper value, which is necessary if a module
1818 compiled without debugging info follows this module. */
1819 if (pst && gdbarch_sofun_address_maybe_missing (gdbarch))
1821 dbx_end_psymtab (objfile, pst,
1822 psymtab_include_list, includes_used,
1823 symnum * symbol_size,
1824 (CORE_ADDR) 0, dependency_list,
1825 dependencies_used, textlow_not_set);
1826 pst = (legacy_psymtab *) 0;
1827 includes_used = 0;
1828 dependencies_used = 0;
1829 has_line_numbers = 0;
1831 continue;
1833 case N_RBRAC:
1834 #ifdef HANDLE_RBRAC
1835 HANDLE_RBRAC (nlist.n_value);
1836 continue;
1837 #endif
1838 case N_EINCL:
1839 case N_DSLINE:
1840 case N_BSLINE:
1841 case N_SSYM: /* Claim: Structure or union element.
1842 Hopefully, I can ignore this. */
1843 case N_ENTRY: /* Alternate entry point; can ignore. */
1844 case N_MAIN: /* Can definitely ignore this. */
1845 case N_CATCH: /* These are GNU C++ extensions */
1846 case N_EHDECL: /* that can safely be ignored here. */
1847 case N_LENG:
1848 case N_BCOMM:
1849 case N_ECOMM:
1850 case N_ECOML:
1851 case N_FNAME:
1852 case N_SLINE:
1853 case N_RSYM:
1854 case N_PSYM:
1855 case N_BNSYM:
1856 case N_ENSYM:
1857 case N_LBRAC:
1858 case N_NSYMS: /* Ultrix 4.0: symbol count */
1859 case N_DEFD: /* GNU Modula-2 */
1860 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */
1862 case N_OBJ: /* Useless types from Solaris. */
1863 case N_OPT:
1864 case N_PATCH:
1865 /* These symbols aren't interesting; don't worry about them. */
1866 continue;
1868 default:
1869 /* If we haven't found it yet, ignore it. It's probably some
1870 new type we don't know about yet. */
1871 unknown_symtype_complaint (hex_string (nlist.n_type));
1872 continue;
1876 /* If there's stuff to be cleaned up, clean it up. */
1877 if (pst)
1879 /* Don't set high text address of PST lower than it already
1880 is. */
1881 CORE_ADDR text_end =
1882 (lowest_text_address == (CORE_ADDR) -1
1883 ? text_addr
1884 : lowest_text_address)
1885 + text_size;
1887 dbx_end_psymtab (objfile, pst, psymtab_include_list, includes_used,
1888 symnum * symbol_size,
1889 (text_end > pst->raw_text_high ()
1890 ? text_end : pst->raw_text_high ()),
1891 dependency_list, dependencies_used, textlow_not_set);
1895 /* Allocate and partially fill a partial symtab. It will be
1896 completely filled at the end of the symbol list.
1898 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
1899 is the address relative to which its symbols are (incremental) or 0
1900 (normal). */
1902 static legacy_psymtab *
1903 start_psymtab (struct objfile *objfile, const char *filename, CORE_ADDR textlow,
1904 int ldsymoff)
1906 legacy_psymtab *result = new legacy_psymtab (filename, objfile, textlow);
1908 result->read_symtab_private =
1909 XOBNEW (&objfile->objfile_obstack, struct symloc);
1910 LDSYMOFF (result) = ldsymoff;
1911 result->legacy_read_symtab = dbx_read_symtab;
1912 result->legacy_expand_psymtab = dbx_psymtab_to_symtab_1;
1913 SYMBOL_SIZE (result) = symbol_size;
1914 SYMBOL_OFFSET (result) = symbol_table_offset;
1915 STRING_OFFSET (result) = string_table_offset;
1916 FILE_STRING_OFFSET (result) = file_string_table_offset;
1918 /* Deduce the source language from the filename for this psymtab. */
1919 psymtab_language = deduce_language_from_filename (filename);
1920 PST_LANGUAGE (result) = psymtab_language;
1922 return result;
1925 /* Close off the current usage of PST.
1926 Returns PST or NULL if the partial symtab was empty and thrown away.
1928 FIXME: List variables and peculiarities of same. */
1930 legacy_psymtab *
1931 dbx_end_psymtab (struct objfile *objfile, legacy_psymtab *pst,
1932 const char **include_list, int num_includes,
1933 int capping_symbol_offset, CORE_ADDR capping_text,
1934 legacy_psymtab **dependency_list,
1935 int number_dependencies,
1936 int textlow_not_set)
1938 int i;
1939 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1941 if (capping_symbol_offset != -1)
1942 LDSYMLEN (pst) = capping_symbol_offset - LDSYMOFF (pst);
1943 pst->set_text_high (capping_text);
1945 /* Under Solaris, the N_SO symbols always have a value of 0,
1946 instead of the usual address of the .o file. Therefore,
1947 we have to do some tricks to fill in texthigh and textlow.
1948 The first trick is: if we see a static
1949 or global function, and the textlow for the current pst
1950 is not set (ie: textlow_not_set), then we use that function's
1951 address for the textlow of the pst. */
1953 /* Now, to fill in texthigh, we remember the last function seen
1954 in the .o file. Also, there's a hack in
1955 bfd/elf.c and gdb/elfread.c to pass the ELF st_size field
1956 to here via the misc_info field. Therefore, we can fill in
1957 a reliable texthigh by taking the address plus size of the
1958 last function in the file. */
1960 if (!pst->text_high_valid && last_function_name
1961 && gdbarch_sofun_address_maybe_missing (gdbarch))
1963 int n;
1964 struct bound_minimal_symbol minsym;
1966 const char *colon = strchr (last_function_name, ':');
1967 if (colon == NULL)
1968 n = 0;
1969 else
1970 n = colon - last_function_name;
1971 char *p = (char *) alloca (n + 2);
1972 strncpy (p, last_function_name, n);
1973 p[n] = 0;
1975 minsym = lookup_minimal_symbol (p, pst->filename, objfile);
1976 if (minsym.minsym == NULL)
1978 /* Sun Fortran appends an underscore to the minimal symbol name,
1979 try again with an appended underscore if the minimal symbol
1980 was not found. */
1981 p[n] = '_';
1982 p[n + 1] = 0;
1983 minsym = lookup_minimal_symbol (p, pst->filename, objfile);
1986 if (minsym.minsym)
1987 pst->set_text_high (MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym)
1988 + MSYMBOL_SIZE (minsym.minsym));
1990 last_function_name = NULL;
1993 if (!gdbarch_sofun_address_maybe_missing (gdbarch))
1995 /* This test will be true if the last .o file is only data. */
1996 else if (textlow_not_set)
1997 pst->set_text_low (pst->raw_text_high ());
1998 else
2000 /* If we know our own starting text address, then walk through all other
2001 psymtabs for this objfile, and if any didn't know their ending text
2002 address, set it to our starting address. Take care to not set our
2003 own ending address to our starting address. */
2005 for (partial_symtab *p1 : objfile->psymtabs ())
2006 if (!p1->text_high_valid && p1->text_low_valid && p1 != pst)
2007 p1->set_text_high (pst->raw_text_low ());
2010 /* End of kludge for patching Solaris textlow and texthigh. */
2012 end_psymtab_common (objfile, pst);
2014 pst->number_of_dependencies = number_dependencies;
2015 if (number_dependencies)
2017 pst->dependencies
2018 = objfile->partial_symtabs->allocate_dependencies (number_dependencies);
2019 memcpy (pst->dependencies, dependency_list,
2020 number_dependencies * sizeof (legacy_psymtab *));
2022 else
2023 pst->dependencies = 0;
2025 for (i = 0; i < num_includes; i++)
2027 legacy_psymtab *subpst =
2028 new legacy_psymtab (include_list[i], objfile);
2030 subpst->read_symtab_private =
2031 XOBNEW (&objfile->objfile_obstack, struct symloc);
2032 LDSYMOFF (subpst) =
2033 LDSYMLEN (subpst) = 0;
2035 /* We could save slight bits of space by only making one of these,
2036 shared by the entire set of include files. FIXME-someday. */
2037 subpst->dependencies =
2038 objfile->partial_symtabs->allocate_dependencies (1);
2039 subpst->dependencies[0] = pst;
2040 subpst->number_of_dependencies = 1;
2042 subpst->legacy_read_symtab = pst->legacy_read_symtab;
2043 subpst->legacy_expand_psymtab = pst->legacy_expand_psymtab;
2046 if (num_includes == 0
2047 && number_dependencies == 0
2048 && pst->n_global_syms == 0
2049 && pst->n_static_syms == 0
2050 && has_line_numbers == 0)
2052 /* Throw away this psymtab, it's empty. We can't deallocate it, since
2053 it is on the obstack, but we can forget to chain it on the list. */
2054 /* Empty psymtabs happen as a result of header files which don't have
2055 any symbols in them. There can be a lot of them. But this check
2056 is wrong, in that a psymtab with N_SLINE entries but nothing else
2057 is not empty, but we don't realize that. Fixing that without slowing
2058 things down might be tricky. */
2060 discard_psymtab (objfile, pst);
2062 /* Indicate that psymtab was thrown away. */
2063 pst = NULL;
2065 return pst;
2068 static void
2069 dbx_psymtab_to_symtab_1 (legacy_psymtab *pst, struct objfile *objfile)
2071 gdb_assert (!pst->readin);
2073 /* Read in all partial symtabs on which this one is dependent. */
2074 pst->read_dependencies (objfile);
2076 if (LDSYMLEN (pst)) /* Otherwise it's a dummy. */
2078 /* Init stuff necessary for reading in symbols */
2079 stabsread_init ();
2080 scoped_free_pendings free_pending;
2081 file_string_table_offset = FILE_STRING_OFFSET (pst);
2082 symbol_size = SYMBOL_SIZE (pst);
2084 /* Read in this file's symbols. */
2085 bfd_seek (objfile->obfd, SYMBOL_OFFSET (pst), SEEK_SET);
2086 read_ofile_symtab (objfile, pst);
2089 pst->readin = true;
2092 /* Read in all of the symbols for a given psymtab for real.
2093 Be verbose about it if the user wants that. SELF is not NULL. */
2095 static void
2096 dbx_read_symtab (legacy_psymtab *self, struct objfile *objfile)
2098 gdb_assert (!self->readin);
2100 if (LDSYMLEN (self) || self->number_of_dependencies)
2102 next_symbol_text_func = dbx_next_symbol_text;
2105 scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data);
2106 gdb::unique_xmalloc_ptr<gdb_byte> data_holder;
2107 if (DBX_STAB_SECTION (objfile))
2109 stabs_data
2110 = symfile_relocate_debug_section (objfile,
2111 DBX_STAB_SECTION (objfile),
2112 NULL);
2113 data_holder.reset (stabs_data);
2116 self->expand_psymtab (objfile);
2119 /* Match with global symbols. This only needs to be done once,
2120 after all of the symtabs and dependencies have been read in. */
2121 scan_file_globals (objfile);
2125 /* Read in a defined section of a specific object file's symbols. */
2127 static void
2128 read_ofile_symtab (struct objfile *objfile, legacy_psymtab *pst)
2130 const char *namestring;
2131 struct external_nlist *bufp;
2132 struct internal_nlist nlist;
2133 unsigned char type;
2134 unsigned max_symnum;
2135 bfd *abfd;
2136 int sym_offset; /* Offset to start of symbols to read */
2137 int sym_size; /* Size of symbols to read */
2138 CORE_ADDR text_offset; /* Start of text segment for symbols */
2139 int text_size; /* Size of text segment for symbols */
2141 sym_offset = LDSYMOFF (pst);
2142 sym_size = LDSYMLEN (pst);
2143 text_offset = pst->text_low (objfile);
2144 text_size = pst->text_high (objfile) - pst->text_low (objfile);
2145 const section_offsets &section_offsets = objfile->section_offsets;
2147 dbxread_objfile = objfile;
2149 stringtab_global = DBX_STRINGTAB (objfile);
2150 set_last_source_file (NULL);
2152 abfd = objfile->obfd;
2153 symfile_bfd = objfile->obfd; /* Implicit param to next_text_symbol. */
2154 symbuf_end = symbuf_idx = 0;
2155 symbuf_read = 0;
2156 symbuf_left = sym_offset + sym_size;
2158 /* It is necessary to actually read one symbol *before* the start
2159 of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL
2160 occurs before the N_SO symbol.
2162 Detecting this in read_dbx_symtab
2163 would slow down initial readin, so we look for it here instead. */
2164 if (!processing_acc_compilation && sym_offset >= (int) symbol_size)
2166 stabs_seek (sym_offset - symbol_size);
2167 fill_symbuf (abfd);
2168 bufp = &symbuf[symbuf_idx++];
2169 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
2170 OBJSTAT (objfile, n_stabs++);
2172 namestring = set_namestring (objfile, &nlist);
2174 processing_gcc_compilation = 0;
2175 if (nlist.n_type == N_TEXT)
2177 const char *tempstring = namestring;
2179 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0)
2180 processing_gcc_compilation = 1;
2181 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2182 processing_gcc_compilation = 2;
2183 if (tempstring[0] == bfd_get_symbol_leading_char (symfile_bfd))
2184 ++tempstring;
2185 if (startswith (tempstring, "__gnu_compiled"))
2186 processing_gcc_compilation = 2;
2189 else
2191 /* The N_SO starting this symtab is the first symbol, so we
2192 better not check the symbol before it. I'm not this can
2193 happen, but it doesn't hurt to check for it. */
2194 stabs_seek (sym_offset);
2195 processing_gcc_compilation = 0;
2198 if (symbuf_idx == symbuf_end)
2199 fill_symbuf (abfd);
2200 bufp = &symbuf[symbuf_idx];
2201 if (bfd_h_get_8 (abfd, bufp->e_type) != N_SO)
2202 error (_("First symbol in segment of executable not a source symbol"));
2204 max_symnum = sym_size / symbol_size;
2206 for (symnum = 0;
2207 symnum < max_symnum;
2208 symnum++)
2210 QUIT; /* Allow this to be interruptable. */
2211 if (symbuf_idx == symbuf_end)
2212 fill_symbuf (abfd);
2213 bufp = &symbuf[symbuf_idx++];
2214 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
2215 OBJSTAT (objfile, n_stabs++);
2217 type = bfd_h_get_8 (abfd, bufp->e_type);
2219 namestring = set_namestring (objfile, &nlist);
2221 if (type & N_STAB)
2223 if (sizeof (nlist.n_value) > 4
2224 /* We are a 64-bit debugger debugging a 32-bit program. */
2225 && (type == N_LSYM || type == N_PSYM))
2226 /* We have to be careful with the n_value in the case of N_LSYM
2227 and N_PSYM entries, because they are signed offsets from frame
2228 pointer, but we actually read them as unsigned 32-bit values.
2229 This is not a problem for 32-bit debuggers, for which negative
2230 values end up being interpreted correctly (as negative
2231 offsets) due to integer overflow.
2232 But we need to sign-extend the value for 64-bit debuggers,
2233 or we'll end up interpreting negative values as very large
2234 positive offsets. */
2235 nlist.n_value = (nlist.n_value ^ 0x80000000) - 0x80000000;
2236 process_one_symbol (type, nlist.n_desc, nlist.n_value,
2237 namestring, section_offsets, objfile,
2238 PST_LANGUAGE (pst));
2240 /* We skip checking for a new .o or -l file; that should never
2241 happen in this routine. */
2242 else if (type == N_TEXT)
2244 /* I don't think this code will ever be executed, because
2245 the GCC_COMPILED_FLAG_SYMBOL usually is right before
2246 the N_SO symbol which starts this source file.
2247 However, there is no reason not to accept
2248 the GCC_COMPILED_FLAG_SYMBOL anywhere. */
2250 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0)
2251 processing_gcc_compilation = 1;
2252 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2253 processing_gcc_compilation = 2;
2255 else if (type & N_EXT || type == (unsigned char) N_TEXT
2256 || type == (unsigned char) N_NBTEXT)
2258 /* Global symbol: see if we came across a dbx definition for
2259 a corresponding symbol. If so, store the value. Remove
2260 syms from the chain when their values are stored, but
2261 search the whole chain, as there may be several syms from
2262 different files with the same name. */
2263 /* This is probably not true. Since the files will be read
2264 in one at a time, each reference to a global symbol will
2265 be satisfied in each file as it appears. So we skip this
2266 section. */
2271 /* In a Solaris elf file, this variable, which comes from the value
2272 of the N_SO symbol, will still be 0. Luckily, text_offset, which
2273 comes from low text address of PST, is correct. */
2274 if (get_last_source_start_addr () == 0)
2275 set_last_source_start_addr (text_offset);
2277 /* In reordered executables last_source_start_addr may not be the
2278 lower bound for this symtab, instead use text_offset which comes
2279 from the low text address of PST, which is correct. */
2280 if (get_last_source_start_addr () > text_offset)
2281 set_last_source_start_addr (text_offset);
2283 pst->compunit_symtab = end_symtab (text_offset + text_size,
2284 SECT_OFF_TEXT (objfile));
2286 end_stabs ();
2288 dbxread_objfile = NULL;
2292 /* Record the namespace that the function defined by SYMBOL was
2293 defined in, if necessary. BLOCK is the associated block; use
2294 OBSTACK for allocation. */
2296 static void
2297 cp_set_block_scope (const struct symbol *symbol,
2298 struct block *block,
2299 struct obstack *obstack)
2301 if (symbol->demangled_name () != NULL)
2303 /* Try to figure out the appropriate namespace from the
2304 demangled name. */
2306 /* FIXME: carlton/2003-04-15: If the function in question is
2307 a method of a class, the name will actually include the
2308 name of the class as well. This should be harmless, but
2309 is a little unfortunate. */
2311 const char *name = symbol->demangled_name ();
2312 unsigned int prefix_len = cp_entire_prefix_len (name);
2314 block_set_scope (block, obstack_strndup (obstack, name, prefix_len),
2315 obstack);
2319 /* This handles a single symbol from the symbol-file, building symbols
2320 into a GDB symtab. It takes these arguments and an implicit argument.
2322 TYPE is the type field of the ".stab" symbol entry.
2323 DESC is the desc field of the ".stab" entry.
2324 VALU is the value field of the ".stab" entry.
2325 NAME is the symbol name, in our address space.
2326 SECTION_OFFSETS is a set of amounts by which the sections of this
2327 object file were relocated when it was loaded into memory. Note
2328 that these section_offsets are not the objfile->section_offsets but
2329 the pst->section_offsets. All symbols that refer to memory
2330 locations need to be offset by these amounts.
2331 OBJFILE is the object file from which we are reading symbols. It
2332 is used in end_symtab.
2333 LANGUAGE is the language of the symtab.
2336 void
2337 process_one_symbol (int type, int desc, CORE_ADDR valu, const char *name,
2338 const section_offsets &section_offsets,
2339 struct objfile *objfile, enum language language)
2341 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2342 struct context_stack *newobj;
2343 struct context_stack cstk;
2344 /* This remembers the address of the start of a function. It is
2345 used because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries
2346 are relative to the current function's start address. On systems
2347 other than Solaris 2, this just holds the SECT_OFF_TEXT value,
2348 and is used to relocate these symbol types rather than
2349 SECTION_OFFSETS. */
2350 static CORE_ADDR function_start_offset;
2352 /* This holds the address of the start of a function, without the
2353 system peculiarities of function_start_offset. */
2354 static CORE_ADDR last_function_start;
2356 /* If this is nonzero, we've seen an N_SLINE since the start of the
2357 current function. We use this to tell us to move the first sline
2358 to the beginning of the function regardless of what its given
2359 value is. */
2360 static int sline_found_in_function = 1;
2362 /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this
2363 source file. Used to detect the SunPRO solaris compiler. */
2364 static int n_opt_found;
2366 /* Something is wrong if we see real data before seeing a source
2367 file name. */
2369 if (get_last_source_file () == NULL && type != (unsigned char) N_SO)
2371 /* Ignore any symbols which appear before an N_SO symbol.
2372 Currently no one puts symbols there, but we should deal
2373 gracefully with the case. A complain()t might be in order,
2374 but this should not be an error (). */
2375 return;
2378 switch (type)
2380 case N_FUN:
2381 case N_FNAME:
2383 if (*name == '\000')
2385 /* This N_FUN marks the end of a function. This closes off
2386 the current block. */
2387 struct block *block;
2389 if (outermost_context_p ())
2391 lbrac_mismatch_complaint (symnum);
2392 break;
2395 /* The following check is added before recording line 0 at
2396 end of function so as to handle hand-generated stabs
2397 which may have an N_FUN stabs at the end of the function,
2398 but no N_SLINE stabs. */
2399 if (sline_found_in_function)
2401 CORE_ADDR addr = last_function_start + valu;
2403 record_line (get_current_subfile (), 0,
2404 gdbarch_addr_bits_remove (gdbarch, addr));
2407 within_function = 0;
2408 cstk = pop_context ();
2410 /* Make a block for the local symbols within. */
2411 block = finish_block (cstk.name,
2412 cstk.old_blocks, NULL,
2413 cstk.start_addr, cstk.start_addr + valu);
2415 /* For C++, set the block's scope. */
2416 if (cstk.name->language () == language_cplus)
2417 cp_set_block_scope (cstk.name, block, &objfile->objfile_obstack);
2419 /* May be switching to an assembler file which may not be using
2420 block relative stabs, so reset the offset. */
2421 function_start_offset = 0;
2423 break;
2426 sline_found_in_function = 0;
2428 /* Relocate for dynamic loading. */
2429 valu += section_offsets[SECT_OFF_TEXT (objfile)];
2430 valu = gdbarch_addr_bits_remove (gdbarch, valu);
2431 last_function_start = valu;
2433 goto define_a_symbol;
2435 case N_LBRAC:
2436 /* This "symbol" just indicates the start of an inner lexical
2437 context within a function. */
2439 /* Ignore extra outermost context from SunPRO cc and acc. */
2440 if (n_opt_found && desc == 1)
2441 break;
2443 valu += function_start_offset;
2445 push_context (desc, valu);
2446 break;
2448 case N_RBRAC:
2449 /* This "symbol" just indicates the end of an inner lexical
2450 context that was started with N_LBRAC. */
2452 /* Ignore extra outermost context from SunPRO cc and acc. */
2453 if (n_opt_found && desc == 1)
2454 break;
2456 valu += function_start_offset;
2458 if (outermost_context_p ())
2460 lbrac_mismatch_complaint (symnum);
2461 break;
2464 cstk = pop_context ();
2465 if (desc != cstk.depth)
2466 lbrac_mismatch_complaint (symnum);
2468 if (*get_local_symbols () != NULL)
2470 /* GCC development snapshots from March to December of
2471 2000 would output N_LSYM entries after N_LBRAC
2472 entries. As a consequence, these symbols are simply
2473 discarded. Complain if this is the case. */
2474 complaint (_("misplaced N_LBRAC entry; discarding local "
2475 "symbols which have no enclosing block"));
2477 *get_local_symbols () = cstk.locals;
2479 if (get_context_stack_depth () > 1)
2481 /* This is not the outermost LBRAC...RBRAC pair in the
2482 function, its local symbols preceded it, and are the ones
2483 just recovered from the context stack. Define the block
2484 for them (but don't bother if the block contains no
2485 symbols. Should we complain on blocks without symbols?
2486 I can't think of any useful purpose for them). */
2487 if (*get_local_symbols () != NULL)
2489 /* Muzzle a compiler bug that makes end < start.
2491 ??? Which compilers? Is this ever harmful?. */
2492 if (cstk.start_addr > valu)
2494 complaint (_("block start larger than block end"));
2495 cstk.start_addr = valu;
2497 /* Make a block for the local symbols within. */
2498 finish_block (0, cstk.old_blocks, NULL,
2499 cstk.start_addr, valu);
2502 else
2504 /* This is the outermost LBRAC...RBRAC pair. There is no
2505 need to do anything; leave the symbols that preceded it
2506 to be attached to the function's own block. We need to
2507 indicate that we just moved outside of the function. */
2508 within_function = 0;
2511 break;
2513 case N_FN:
2514 case N_FN_SEQ:
2515 /* This kind of symbol indicates the start of an object file.
2516 Relocate for dynamic loading. */
2517 valu += section_offsets[SECT_OFF_TEXT (objfile)];
2518 break;
2520 case N_SO:
2521 /* This type of symbol indicates the start of data for one
2522 source file. Finish the symbol table of the previous source
2523 file (if any) and start accumulating a new symbol table.
2524 Relocate for dynamic loading. */
2525 valu += section_offsets[SECT_OFF_TEXT (objfile)];
2527 n_opt_found = 0;
2529 if (get_last_source_file ())
2531 /* Check if previous symbol was also an N_SO (with some
2532 sanity checks). If so, that one was actually the
2533 directory name, and the current one is the real file
2534 name. Patch things up. */
2535 if (previous_stab_code == (unsigned char) N_SO)
2537 patch_subfile_names (get_current_subfile (), name);
2538 break; /* Ignore repeated SOs. */
2540 end_symtab (valu, SECT_OFF_TEXT (objfile));
2541 end_stabs ();
2544 /* Null name means this just marks the end of text for this .o
2545 file. Don't start a new symtab in this case. */
2546 if (*name == '\000')
2547 break;
2549 function_start_offset = 0;
2551 start_stabs ();
2552 start_symtab (objfile, name, NULL, valu, language);
2553 record_debugformat ("stabs");
2554 break;
2556 case N_SOL:
2557 /* This type of symbol indicates the start of data for a
2558 sub-source-file, one whose contents were copied or included
2559 in the compilation of the main source file (whose name was
2560 given in the N_SO symbol). Relocate for dynamic loading. */
2561 valu += section_offsets[SECT_OFF_TEXT (objfile)];
2562 start_subfile (name);
2563 break;
2565 case N_BINCL:
2566 push_subfile ();
2567 add_new_header_file (name, valu);
2568 start_subfile (name);
2569 break;
2571 case N_EINCL:
2572 start_subfile (pop_subfile ());
2573 break;
2575 case N_EXCL:
2576 add_old_header_file (name, valu);
2577 break;
2579 case N_SLINE:
2580 /* This type of "symbol" really just records one line-number --
2581 core-address correspondence. Enter it in the line list for
2582 this symbol table. */
2584 /* Relocate for dynamic loading and for ELF acc
2585 function-relative symbols. */
2586 valu += function_start_offset;
2588 /* GCC 2.95.3 emits the first N_SLINE stab somewhere in the
2589 middle of the prologue instead of right at the start of the
2590 function. To deal with this we record the address for the
2591 first N_SLINE stab to be the start of the function instead of
2592 the listed location. We really shouldn't to this. When
2593 compiling with optimization, this first N_SLINE stab might be
2594 optimized away. Other (non-GCC) compilers don't emit this
2595 stab at all. There is no real harm in having an extra
2596 numbered line, although it can be a bit annoying for the
2597 user. However, it totally screws up our testsuite.
2599 So for now, keep adjusting the address of the first N_SLINE
2600 stab, but only for code compiled with GCC. */
2602 if (within_function && sline_found_in_function == 0)
2604 CORE_ADDR addr = processing_gcc_compilation == 2 ?
2605 last_function_start : valu;
2607 record_line (get_current_subfile (), desc,
2608 gdbarch_addr_bits_remove (gdbarch, addr));
2609 sline_found_in_function = 1;
2611 else
2612 record_line (get_current_subfile (), desc,
2613 gdbarch_addr_bits_remove (gdbarch, valu));
2614 break;
2616 case N_BCOMM:
2617 common_block_start (name, objfile);
2618 break;
2620 case N_ECOMM:
2621 common_block_end (objfile);
2622 break;
2624 /* The following symbol types need to have the appropriate
2625 offset added to their value; then we process symbol
2626 definitions in the name. */
2628 case N_STSYM: /* Static symbol in data segment. */
2629 case N_LCSYM: /* Static symbol in BSS segment. */
2630 case N_ROSYM: /* Static symbol in read-only data segment. */
2631 /* HORRID HACK DEPT. However, it's Sun's furgin' fault.
2632 Solaris 2's stabs-in-elf makes *most* symbols relative but
2633 leaves a few absolute (at least for Solaris 2.1 and version
2634 2.0.1 of the SunPRO compiler). N_STSYM and friends sit on
2635 the fence. .stab "foo:S...",N_STSYM is absolute (ld
2636 relocates it) .stab "foo:V...",N_STSYM is relative (section
2637 base subtracted). This leaves us no choice but to search for
2638 the 'S' or 'V'... (or pass the whole section_offsets stuff
2639 down ONE MORE function call level, which we really don't want
2640 to do). */
2642 const char *p;
2644 /* Normal object file and NLMs have non-zero text seg offsets,
2645 but don't need their static syms offset in this fashion.
2646 XXX - This is really a crock that should be fixed in the
2647 solib handling code so that I don't have to work around it
2648 here. */
2650 if (!symfile_relocatable)
2652 p = strchr (name, ':');
2653 if (p != 0 && p[1] == 'S')
2655 /* The linker relocated it. We don't want to add a
2656 Sun-stabs Tfoo.foo-like offset, but we *do*
2657 want to add whatever solib.c passed to
2658 symbol_file_add as addr (this is known to affect
2659 SunOS 4, and I suspect ELF too). Since there is no
2660 Ttext.text symbol, we can get addr from the text offset. */
2661 valu += section_offsets[SECT_OFF_TEXT (objfile)];
2662 goto define_a_symbol;
2665 /* Since it's not the kludge case, re-dispatch to the right
2666 handler. */
2667 switch (type)
2669 case N_STSYM:
2670 goto case_N_STSYM;
2671 case N_LCSYM:
2672 goto case_N_LCSYM;
2673 case N_ROSYM:
2674 goto case_N_ROSYM;
2675 default:
2676 internal_error (__FILE__, __LINE__,
2677 _("failed internal consistency check"));
2681 case_N_STSYM: /* Static symbol in data segment. */
2682 case N_DSLINE: /* Source line number, data segment. */
2683 valu += section_offsets[SECT_OFF_DATA (objfile)];
2684 goto define_a_symbol;
2686 case_N_LCSYM: /* Static symbol in BSS segment. */
2687 case N_BSLINE: /* Source line number, BSS segment. */
2688 /* N_BROWS: overlaps with N_BSLINE. */
2689 valu += section_offsets[SECT_OFF_BSS (objfile)];
2690 goto define_a_symbol;
2692 case_N_ROSYM: /* Static symbol in read-only data segment. */
2693 valu += section_offsets[SECT_OFF_RODATA (objfile)];
2694 goto define_a_symbol;
2696 case N_ENTRY: /* Alternate entry point. */
2697 /* Relocate for dynamic loading. */
2698 valu += section_offsets[SECT_OFF_TEXT (objfile)];
2699 goto define_a_symbol;
2701 /* The following symbol types we don't know how to process.
2702 Handle them in a "default" way, but complain to people who
2703 care. */
2704 default:
2705 case N_CATCH: /* Exception handler catcher. */
2706 case N_EHDECL: /* Exception handler name. */
2707 case N_PC: /* Global symbol in Pascal. */
2708 case N_M2C: /* Modula-2 compilation unit. */
2709 /* N_MOD2: overlaps with N_EHDECL. */
2710 case N_SCOPE: /* Modula-2 scope information. */
2711 case N_ECOML: /* End common (local name). */
2712 case N_NBTEXT: /* Gould Non-Base-Register symbols??? */
2713 case N_NBDATA:
2714 case N_NBBSS:
2715 case N_NBSTS:
2716 case N_NBLCS:
2717 unknown_symtype_complaint (hex_string (type));
2718 /* FALLTHROUGH */
2720 define_a_symbol:
2721 /* These symbol types don't need the address field relocated,
2722 since it is either unused, or is absolute. */
2723 case N_GSYM: /* Global variable. */
2724 case N_NSYMS: /* Number of symbols (Ultrix). */
2725 case N_NOMAP: /* No map? (Ultrix). */
2726 case N_RSYM: /* Register variable. */
2727 case N_DEFD: /* Modula-2 GNU module dependency. */
2728 case N_SSYM: /* Struct or union element. */
2729 case N_LSYM: /* Local symbol in stack. */
2730 case N_PSYM: /* Parameter variable. */
2731 case N_LENG: /* Length of preceding symbol type. */
2732 if (name)
2734 int deftype;
2735 const char *colon_pos = strchr (name, ':');
2737 if (colon_pos == NULL)
2738 deftype = '\0';
2739 else
2740 deftype = colon_pos[1];
2742 switch (deftype)
2744 case 'f':
2745 case 'F':
2746 /* Deal with the SunPRO 3.0 compiler which omits the
2747 address from N_FUN symbols. */
2748 if (type == N_FUN
2749 && valu == section_offsets[SECT_OFF_TEXT (objfile)]
2750 && gdbarch_sofun_address_maybe_missing (gdbarch))
2752 struct bound_minimal_symbol minsym
2753 = find_stab_function (name, get_last_source_file (),
2754 objfile);
2755 if (minsym.minsym != NULL)
2756 valu = BMSYMBOL_VALUE_ADDRESS (minsym);
2759 /* These addresses are absolute. */
2760 function_start_offset = valu;
2762 within_function = 1;
2764 if (get_context_stack_depth () > 1)
2766 complaint (_("unmatched N_LBRAC before symtab pos %d"),
2767 symnum);
2768 break;
2771 if (!outermost_context_p ())
2773 struct block *block;
2775 cstk = pop_context ();
2776 /* Make a block for the local symbols within. */
2777 block = finish_block (cstk.name,
2778 cstk.old_blocks, NULL,
2779 cstk.start_addr, valu);
2781 /* For C++, set the block's scope. */
2782 if (cstk.name->language () == language_cplus)
2783 cp_set_block_scope (cstk.name, block,
2784 &objfile->objfile_obstack);
2787 newobj = push_context (0, valu);
2788 newobj->name = define_symbol (valu, name, desc, type, objfile);
2789 break;
2791 default:
2792 define_symbol (valu, name, desc, type, objfile);
2793 break;
2796 break;
2798 /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it
2799 for a bunch of other flags, too. Someday we may parse their
2800 flags; for now we ignore theirs and hope they'll ignore ours. */
2801 case N_OPT: /* Solaris 2: Compiler options. */
2802 if (name)
2804 if (strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2806 processing_gcc_compilation = 2;
2808 else
2809 n_opt_found = 1;
2811 break;
2813 case N_MAIN: /* Name of main routine. */
2814 /* FIXME: If one has a symbol file with N_MAIN and then replaces
2815 it with a symbol file with "main" and without N_MAIN. I'm
2816 not sure exactly what rule to follow but probably something
2817 like: N_MAIN takes precedence over "main" no matter what
2818 objfile it is in; If there is more than one N_MAIN, choose
2819 the one in the symfile_objfile; If there is more than one
2820 N_MAIN within a given objfile, complain() and choose
2821 arbitrarily. (kingdon) */
2822 if (name != NULL)
2823 set_objfile_main_name (objfile, name, language_unknown);
2824 break;
2826 /* The following symbol types can be ignored. */
2827 case N_OBJ: /* Solaris 2: Object file dir and name. */
2828 case N_PATCH: /* Solaris 2: Patch Run Time Checker. */
2829 /* N_UNDF: Solaris 2: File separator mark. */
2830 /* N_UNDF: -- we will never encounter it, since we only process
2831 one file's symbols at once. */
2832 case N_ENDM: /* Solaris 2: End of module. */
2833 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */
2834 break;
2837 /* '#' is a GNU C extension to allow one symbol to refer to another
2838 related symbol.
2840 Generally this is used so that an alias can refer to its main
2841 symbol. */
2842 gdb_assert (name);
2843 if (name[0] == '#')
2845 /* Initialize symbol reference names and determine if this is a
2846 definition. If a symbol reference is being defined, go ahead
2847 and add it. Otherwise, just return. */
2849 const char *s = name;
2850 int refnum;
2852 /* If this stab defines a new reference ID that is not on the
2853 reference list, then put it on the reference list.
2855 We go ahead and advance NAME past the reference, even though
2856 it is not strictly necessary at this time. */
2857 refnum = symbol_reference_defined (&s);
2858 if (refnum >= 0)
2859 if (!ref_search (refnum))
2860 ref_add (refnum, 0, name, valu);
2861 name = s;
2864 previous_stab_code = type;
2867 /* FIXME: The only difference between this and elfstab_build_psymtabs
2868 is the call to install_minimal_symbols for elf, and the support for
2869 split sections. If the differences are really that small, the code
2870 should be shared. */
2872 /* Scan and build partial symbols for an coff symbol file.
2873 The coff file has already been processed to get its minimal symbols.
2875 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
2876 rolled into one.
2878 OBJFILE is the object file we are reading symbols from.
2879 ADDR is the address relative to which the symbols are (e.g.
2880 the base address of the text segment).
2881 TEXTADDR is the address of the text section.
2882 TEXTSIZE is the size of the text section.
2883 STABSECTS is the list of .stab sections in OBJFILE.
2884 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
2885 .stabstr section exists.
2887 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
2888 adjusted for coff details. */
2890 void
2891 coffstab_build_psymtabs (struct objfile *objfile,
2892 CORE_ADDR textaddr, unsigned int textsize,
2893 const std::vector<asection *> &stabsects,
2894 file_ptr stabstroffset, unsigned int stabstrsize)
2896 int val;
2897 bfd *sym_bfd = objfile->obfd;
2898 const char *name = bfd_get_filename (sym_bfd);
2899 unsigned int stabsize;
2901 /* Allocate struct to keep track of stab reading. */
2902 dbx_objfile_data_key.emplace (objfile);
2904 DBX_TEXT_ADDR (objfile) = textaddr;
2905 DBX_TEXT_SIZE (objfile) = textsize;
2907 #define COFF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */
2908 DBX_SYMBOL_SIZE (objfile) = COFF_STABS_SYMBOL_SIZE;
2909 DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
2911 if (stabstrsize > bfd_get_size (sym_bfd))
2912 error (_("ridiculous string table size: %d bytes"), stabstrsize);
2913 DBX_STRINGTAB (objfile) = (char *)
2914 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1);
2915 OBJSTAT (objfile, sz_strtab += stabstrsize + 1);
2917 /* Now read in the string table in one big gulp. */
2919 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET);
2920 if (val < 0)
2921 perror_with_name (name);
2922 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd);
2923 if (val != stabstrsize)
2924 perror_with_name (name);
2926 stabsread_new_init ();
2927 free_header_files ();
2928 init_header_files ();
2930 processing_acc_compilation = 1;
2932 /* In a coff file, we've already installed the minimal symbols that came
2933 from the coff (non-stab) symbol table, so always act like an
2934 incremental load here. */
2935 scoped_restore save_symbuf_sections
2936 = make_scoped_restore (&symbuf_sections);
2937 if (stabsects.size () == 1)
2939 stabsize = bfd_section_size (stabsects[0]);
2940 DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile);
2941 DBX_SYMTAB_OFFSET (objfile) = stabsects[0]->filepos;
2943 else
2945 DBX_SYMCOUNT (objfile) = 0;
2946 for (asection *section : stabsects)
2948 stabsize = bfd_section_size (section);
2949 DBX_SYMCOUNT (objfile) += stabsize / DBX_SYMBOL_SIZE (objfile);
2952 DBX_SYMTAB_OFFSET (objfile) = stabsects[0]->filepos;
2954 sect_idx = 1;
2955 symbuf_sections = &stabsects;
2956 symbuf_left = bfd_section_size (stabsects[0]);
2957 symbuf_read = 0;
2960 dbx_symfile_read (objfile, 0);
2963 /* Scan and build partial symbols for an ELF symbol file.
2964 This ELF file has already been processed to get its minimal symbols.
2966 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
2967 rolled into one.
2969 OBJFILE is the object file we are reading symbols from.
2970 ADDR is the address relative to which the symbols are (e.g.
2971 the base address of the text segment).
2972 STABSECT is the BFD section information for the .stab section.
2973 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
2974 .stabstr section exists.
2976 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
2977 adjusted for elf details. */
2979 void
2980 elfstab_build_psymtabs (struct objfile *objfile, asection *stabsect,
2981 file_ptr stabstroffset, unsigned int stabstrsize)
2983 int val;
2984 bfd *sym_bfd = objfile->obfd;
2985 const char *name = bfd_get_filename (sym_bfd);
2987 stabsread_new_init ();
2989 /* Allocate struct to keep track of stab reading. */
2990 dbx_objfile_data_key.emplace (objfile);
2992 /* Find the first and last text address. dbx_symfile_read seems to
2993 want this. */
2994 find_text_range (sym_bfd, objfile);
2996 #define ELF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */
2997 DBX_SYMBOL_SIZE (objfile) = ELF_STABS_SYMBOL_SIZE;
2998 DBX_SYMCOUNT (objfile)
2999 = bfd_section_size (stabsect) / DBX_SYMBOL_SIZE (objfile);
3000 DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
3001 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos;
3002 DBX_STAB_SECTION (objfile) = stabsect;
3004 if (stabstrsize > bfd_get_size (sym_bfd))
3005 error (_("ridiculous string table size: %d bytes"), stabstrsize);
3006 DBX_STRINGTAB (objfile) = (char *)
3007 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1);
3008 OBJSTAT (objfile, sz_strtab += stabstrsize + 1);
3010 /* Now read in the string table in one big gulp. */
3012 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET);
3013 if (val < 0)
3014 perror_with_name (name);
3015 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd);
3016 if (val != stabstrsize)
3017 perror_with_name (name);
3019 stabsread_new_init ();
3020 free_header_files ();
3021 init_header_files ();
3023 processing_acc_compilation = 1;
3025 symbuf_read = 0;
3026 symbuf_left = bfd_section_size (stabsect);
3028 scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data);
3029 gdb::unique_xmalloc_ptr<gdb_byte> data_holder;
3031 stabs_data = symfile_relocate_debug_section (objfile, stabsect, NULL);
3032 if (stabs_data)
3033 data_holder.reset (stabs_data);
3035 /* In an elf file, we've already installed the minimal symbols that came
3036 from the elf (non-stab) symbol table, so always act like an
3037 incremental load here. dbx_symfile_read should not generate any new
3038 minimal symbols, since we will have already read the ELF dynamic symbol
3039 table and normal symbol entries won't be in the ".stab" section; but in
3040 case it does, it will install them itself. */
3041 dbx_symfile_read (objfile, 0);
3044 /* Scan and build partial symbols for a file with special sections for stabs
3045 and stabstrings. The file has already been processed to get its minimal
3046 symbols, and any other symbols that might be necessary to resolve GSYMs.
3048 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
3049 rolled into one.
3051 OBJFILE is the object file we are reading symbols from.
3052 ADDR is the address relative to which the symbols are (e.g. the base address
3053 of the text segment).
3054 STAB_NAME is the name of the section that contains the stabs.
3055 STABSTR_NAME is the name of the section that contains the stab strings.
3057 This routine is mostly copied from dbx_symfile_init and
3058 dbx_symfile_read. */
3060 void
3061 stabsect_build_psymtabs (struct objfile *objfile, char *stab_name,
3062 char *stabstr_name, char *text_name)
3064 int val;
3065 bfd *sym_bfd = objfile->obfd;
3066 const char *name = bfd_get_filename (sym_bfd);
3067 asection *stabsect;
3068 asection *stabstrsect;
3069 asection *text_sect;
3071 stabsect = bfd_get_section_by_name (sym_bfd, stab_name);
3072 stabstrsect = bfd_get_section_by_name (sym_bfd, stabstr_name);
3074 if (!stabsect)
3075 return;
3077 if (!stabstrsect)
3078 error (_("stabsect_build_psymtabs: Found stabs (%s), "
3079 "but not string section (%s)"),
3080 stab_name, stabstr_name);
3082 dbx_objfile_data_key.emplace (objfile);
3084 text_sect = bfd_get_section_by_name (sym_bfd, text_name);
3085 if (!text_sect)
3086 error (_("Can't find %s section in symbol file"), text_name);
3087 DBX_TEXT_ADDR (objfile) = bfd_section_vma (text_sect);
3088 DBX_TEXT_SIZE (objfile) = bfd_section_size (text_sect);
3090 DBX_SYMBOL_SIZE (objfile) = sizeof (struct external_nlist);
3091 DBX_SYMCOUNT (objfile) = bfd_section_size (stabsect)
3092 / DBX_SYMBOL_SIZE (objfile);
3093 DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (stabstrsect);
3094 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; /* XXX - FIXME: POKING
3095 INSIDE BFD DATA
3096 STRUCTURES */
3098 if (DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
3099 error (_("ridiculous string table size: %d bytes"),
3100 DBX_STRINGTAB_SIZE (objfile));
3101 DBX_STRINGTAB (objfile) = (char *)
3102 obstack_alloc (&objfile->objfile_obstack,
3103 DBX_STRINGTAB_SIZE (objfile) + 1);
3104 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile) + 1);
3106 /* Now read in the string table in one big gulp. */
3108 val = bfd_get_section_contents (sym_bfd, /* bfd */
3109 stabstrsect, /* bfd section */
3110 DBX_STRINGTAB (objfile), /* input buffer */
3111 0, /* offset into section */
3112 DBX_STRINGTAB_SIZE (objfile)); /* amount to
3113 read */
3115 if (!val)
3116 perror_with_name (name);
3118 stabsread_new_init ();
3119 free_header_files ();
3120 init_header_files ();
3122 /* Now, do an incremental load. */
3124 processing_acc_compilation = 1;
3125 dbx_symfile_read (objfile, 0);
3128 static const struct sym_fns aout_sym_fns =
3130 dbx_new_init, /* init anything gbl to entire symtab */
3131 dbx_symfile_init, /* read initial info, setup for sym_read() */
3132 dbx_symfile_read, /* read a symbol file into symtab */
3133 NULL, /* sym_read_psymbols */
3134 dbx_symfile_finish, /* finished with file, cleanup */
3135 default_symfile_offsets, /* parse user's offsets to internal form */
3136 default_symfile_segments, /* Get segment information from a file. */
3137 NULL,
3138 default_symfile_relocate, /* Relocate a debug section. */
3139 NULL, /* sym_probe_fns */
3140 &psym_functions
3143 void _initialize_dbxread ();
3144 void
3145 _initialize_dbxread ()
3147 add_symtab_fns (bfd_target_aout_flavour, &aout_sym_fns);