1 /* Read dbx symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1986-2013 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
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.
10
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.
15
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/>. */
18
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.
24
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 */
32
33 #include "defs.h"
34 #include "gdb_string.h"
35
36 #if defined(__CYGNUSCLIB__)
37 #include <sys/types.h>
38 #include <fcntl.h>
39 #endif
40
41 #include "gdb_obstack.h"
42 #include "gdb_stat.h"
43 #include "symtab.h"
44 #include "breakpoint.h"
45 #include "target.h"
46 #include "gdbcore.h" /* for bfd stuff */
47 #include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */
48 #include "filenames.h"
49 #include "objfiles.h"
50 #include "buildsym.h"
51 #include "stabsread.h"
52 #include "gdb-stabs.h"
53 #include "demangle.h"
54 #include "complaints.h"
55 #include "cp-abi.h"
56 #include "cp-support.h"
57 #include "psympriv.h"
58 #include "block.h"
59
60 #include "gdb_assert.h"
61 #include "gdb_string.h"
62
63 #include "aout/aout64.h"
64 #include "aout/stab_gnu.h" /* We always use GNU stabs, not
65 native, now. */
66
67
68 /* Key for dbx-associated data. */
69
70 const struct objfile_data *dbx_objfile_data_key;
71
72 /* We put a pointer to this structure in the read_symtab_private field
73 of the psymtab. */
74
75 struct symloc
76 {
77 /* Offset within the file symbol table of first local symbol for this
78 file. */
79
80 int ldsymoff;
81
82 /* Length (in bytes) of the section of the symbol table devoted to
83 this file's symbols (actually, the section bracketed may contain
84 more than just this file's symbols). If ldsymlen is 0, the only
85 reason for this thing's existence is the dependency list. Nothing
86 else will happen when it is read in. */
87
88 int ldsymlen;
89
90 /* The size of each symbol in the symbol file (in external form). */
91
92 int symbol_size;
93
94 /* Further information needed to locate the symbols if they are in
95 an ELF file. */
96
97 int symbol_offset;
98 int string_offset;
99 int file_string_offset;
100 };
101
102 #define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff)
103 #define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen)
104 #define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private))
105 #define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size)
106 #define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset)
107 #define STRING_OFFSET(p) (SYMLOC(p)->string_offset)
108 #define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset)
109
110
111 /* The objfile we are currently reading. */
112
113 static struct objfile *dbxread_objfile;
114
115 /* Remember what we deduced to be the source language of this psymtab. */
116
117 static enum language psymtab_language = language_unknown;
118
119 /* The BFD for this file -- implicit parameter to next_symbol_text. */
120
121 static bfd *symfile_bfd;
122
123 /* The size of each symbol in the symbol file (in external form).
124 This is set by dbx_symfile_read when building psymtabs, and by
125 dbx_psymtab_to_symtab when building symtabs. */
126
127 static unsigned symbol_size;
128
129 /* This is the offset of the symbol table in the executable file. */
130
131 static unsigned symbol_table_offset;
132
133 /* This is the offset of the string table in the executable file. */
134
135 static unsigned string_table_offset;
136
137 /* For elf+stab executables, the n_strx field is not a simple index
138 into the string table. Instead, each .o file has a base offset in
139 the string table, and the associated symbols contain offsets from
140 this base. The following two variables contain the base offset for
141 the current and next .o files. */
142
143 static unsigned int file_string_table_offset;
144 static unsigned int next_file_string_table_offset;
145
146 /* .o and NLM files contain unrelocated addresses which are based at
147 0. When non-zero, this flag disables some of the special cases for
148 Solaris elf+stab text addresses at location 0. */
149
150 static int symfile_relocatable = 0;
151
152 /* If this is nonzero, N_LBRAC, N_RBRAC, and N_SLINE entries are
153 relative to the function start address. */
154
155 static int block_address_function_relative = 0;
156
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). */
162
163 static CORE_ADDR lowest_text_address;
164
165 /* Non-zero if there is any line number info in the objfile. Prevents
166 end_psymtab from discarding an otherwise empty psymtab. */
167
168 static int has_line_numbers;
169
170 /* Complaints about the symbols we have encountered. */
171
172 static void
unknown_symtype_complaint(const char * arg1)173 unknown_symtype_complaint (const char *arg1)
174 {
175 complaint (&symfile_complaints, _("unknown symbol type %s"), arg1);
176 }
177
178 static void
lbrac_mismatch_complaint(int arg1)179 lbrac_mismatch_complaint (int arg1)
180 {
181 complaint (&symfile_complaints,
182 _("N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d"), arg1);
183 }
184
185 static void
repeated_header_complaint(const char * arg1,int arg2)186 repeated_header_complaint (const char *arg1, int arg2)
187 {
188 complaint (&symfile_complaints,
189 _("\"repeated\" header file %s not "
190 "previously seen, at symtab pos %d"),
191 arg1, arg2);
192 }
193
194 /* find_text_range --- find start and end of loadable code sections
195
196 The find_text_range function finds the shortest address range that
197 encloses all sections containing executable code, and stores it in
198 objfile's text_addr and text_size members.
199
200 dbx_symfile_read will use this to finish off the partial symbol
201 table, in some cases. */
202
203 static void
find_text_range(bfd * sym_bfd,struct objfile * objfile)204 find_text_range (bfd * sym_bfd, struct objfile *objfile)
205 {
206 asection *sec;
207 int found_any = 0;
208 CORE_ADDR start = 0;
209 CORE_ADDR end = 0;
210
211 for (sec = sym_bfd->sections; sec; sec = sec->next)
212 if (bfd_get_section_flags (sym_bfd, sec) & SEC_CODE)
213 {
214 CORE_ADDR sec_start = bfd_section_vma (sym_bfd, sec);
215 CORE_ADDR sec_end = sec_start + bfd_section_size (sym_bfd, sec);
216
217 if (found_any)
218 {
219 if (sec_start < start)
220 start = sec_start;
221 if (sec_end > end)
222 end = sec_end;
223 }
224 else
225 {
226 start = sec_start;
227 end = sec_end;
228 }
229
230 found_any = 1;
231 }
232
233 if (!found_any)
234 error (_("Can't find any code sections in symbol file"));
235
236 DBX_TEXT_ADDR (objfile) = start;
237 DBX_TEXT_SIZE (objfile) = end - start;
238 }
239
240
241
242 /* During initial symbol readin, we need to have a structure to keep
243 track of which psymtabs have which bincls in them. This structure
244 is used during readin to setup the list of dependencies within each
245 partial symbol table. */
246
247 struct header_file_location
248 {
249 char *name; /* Name of header file */
250 int instance; /* See above */
251 struct partial_symtab *pst; /* Partial symtab that has the
252 BINCL/EINCL defs for this file. */
253 };
254
255 /* The actual list and controling variables. */
256 static struct header_file_location *bincl_list, *next_bincl;
257 static int bincls_allocated;
258
259 /* Local function prototypes. */
260
261 extern void _initialize_dbxread (void);
262
263 static void read_ofile_symtab (struct objfile *, struct partial_symtab *);
264
265 static void dbx_read_symtab (struct partial_symtab *self,
266 struct objfile *objfile);
267
268 static void dbx_psymtab_to_symtab_1 (struct objfile *, struct partial_symtab *);
269
270 static void read_dbx_dynamic_symtab (struct objfile *objfile);
271
272 static void read_dbx_symtab (struct objfile *);
273
274 static void free_bincl_list (struct objfile *);
275
276 static struct partial_symtab *find_corresponding_bincl_psymtab (char *, int);
277
278 static void add_bincl_to_list (struct partial_symtab *, char *, int);
279
280 static void init_bincl_list (int, struct objfile *);
281
282 static char *dbx_next_symbol_text (struct objfile *);
283
284 static void fill_symbuf (bfd *);
285
286 static void dbx_symfile_init (struct objfile *);
287
288 static void dbx_new_init (struct objfile *);
289
290 static void dbx_symfile_read (struct objfile *, int);
291
292 static void dbx_symfile_finish (struct objfile *);
293
294 static void record_minimal_symbol (char *, CORE_ADDR, int, struct objfile *);
295
296 static void add_new_header_file (char *, int);
297
298 static void add_old_header_file (char *, int);
299
300 static void add_this_object_header_file (int);
301
302 static struct partial_symtab *start_psymtab (struct objfile *, char *,
303 CORE_ADDR, int,
304 struct partial_symbol **,
305 struct partial_symbol **);
306
307 /* Free up old header file tables. */
308
309 void
free_header_files(void)310 free_header_files (void)
311 {
312 if (this_object_header_files)
313 {
314 xfree (this_object_header_files);
315 this_object_header_files = NULL;
316 }
317 n_allocated_this_object_header_files = 0;
318 }
319
320 /* Allocate new header file tables. */
321
322 void
init_header_files(void)323 init_header_files (void)
324 {
325 n_allocated_this_object_header_files = 10;
326 this_object_header_files = (int *) xmalloc (10 * sizeof (int));
327 }
328
329 /* Add header file number I for this object file
330 at the next successive FILENUM. */
331
332 static void
add_this_object_header_file(int i)333 add_this_object_header_file (int i)
334 {
335 if (n_this_object_header_files == n_allocated_this_object_header_files)
336 {
337 n_allocated_this_object_header_files *= 2;
338 this_object_header_files
339 = (int *) xrealloc ((char *) this_object_header_files,
340 n_allocated_this_object_header_files * sizeof (int));
341 }
342
343 this_object_header_files[n_this_object_header_files++] = i;
344 }
345
346 /* Add to this file an "old" header file, one already seen in
347 a previous object file. NAME is the header file's name.
348 INSTANCE is its instance code, to select among multiple
349 symbol tables for the same header file. */
350
351 static void
add_old_header_file(char * name,int instance)352 add_old_header_file (char *name, int instance)
353 {
354 struct header_file *p = HEADER_FILES (dbxread_objfile);
355 int i;
356
357 for (i = 0; i < N_HEADER_FILES (dbxread_objfile); i++)
358 if (filename_cmp (p[i].name, name) == 0 && instance == p[i].instance)
359 {
360 add_this_object_header_file (i);
361 return;
362 }
363 repeated_header_complaint (name, symnum);
364 }
365
366 /* Add to this file a "new" header file: definitions for its types follow.
367 NAME is the header file's name.
368 Most often this happens only once for each distinct header file,
369 but not necessarily. If it happens more than once, INSTANCE has
370 a different value each time, and references to the header file
371 use INSTANCE values to select among them.
372
373 dbx output contains "begin" and "end" markers for each new header file,
374 but at this level we just need to know which files there have been;
375 so we record the file when its "begin" is seen and ignore the "end". */
376
377 static void
add_new_header_file(char * name,int instance)378 add_new_header_file (char *name, int instance)
379 {
380 int i;
381 struct header_file *hfile;
382
383 /* Make sure there is room for one more header file. */
384
385 i = N_ALLOCATED_HEADER_FILES (dbxread_objfile);
386
387 if (N_HEADER_FILES (dbxread_objfile) == i)
388 {
389 if (i == 0)
390 {
391 N_ALLOCATED_HEADER_FILES (dbxread_objfile) = 10;
392 HEADER_FILES (dbxread_objfile) = (struct header_file *)
393 xmalloc (10 * sizeof (struct header_file));
394 }
395 else
396 {
397 i *= 2;
398 N_ALLOCATED_HEADER_FILES (dbxread_objfile) = i;
399 HEADER_FILES (dbxread_objfile) = (struct header_file *)
400 xrealloc ((char *) HEADER_FILES (dbxread_objfile),
401 (i * sizeof (struct header_file)));
402 }
403 }
404
405 /* Create an entry for this header file. */
406
407 i = N_HEADER_FILES (dbxread_objfile)++;
408 hfile = HEADER_FILES (dbxread_objfile) + i;
409 hfile->name = xstrdup (name);
410 hfile->instance = instance;
411 hfile->length = 10;
412 hfile->vector
413 = (struct type **) xmalloc (10 * sizeof (struct type *));
414 memset (hfile->vector, 0, 10 * sizeof (struct type *));
415
416 add_this_object_header_file (i);
417 }
418
419 #if 0
420 static struct type **
421 explicit_lookup_type (int real_filenum, int index)
422 {
423 struct header_file *f = &HEADER_FILES (dbxread_objfile)[real_filenum];
424
425 if (index >= f->length)
426 {
427 f->length *= 2;
428 f->vector = (struct type **)
429 xrealloc (f->vector, f->length * sizeof (struct type *));
430 memset (&f->vector[f->length / 2],
431 '\0', f->length * sizeof (struct type *) / 2);
432 }
433 return &f->vector[index];
434 }
435 #endif
436
437 static void
record_minimal_symbol(char * name,CORE_ADDR address,int type,struct objfile * objfile)438 record_minimal_symbol (char *name, CORE_ADDR address, int type,
439 struct objfile *objfile)
440 {
441 enum minimal_symbol_type ms_type;
442 int section;
443 asection *bfd_section;
444
445 switch (type)
446 {
447 case N_TEXT | N_EXT:
448 ms_type = mst_text;
449 section = SECT_OFF_TEXT (objfile);
450 bfd_section = DBX_TEXT_SECTION (objfile);
451 break;
452 case N_DATA | N_EXT:
453 ms_type = mst_data;
454 section = SECT_OFF_DATA (objfile);
455 bfd_section = DBX_DATA_SECTION (objfile);
456 break;
457 case N_BSS | N_EXT:
458 ms_type = mst_bss;
459 section = SECT_OFF_BSS (objfile);
460 bfd_section = DBX_BSS_SECTION (objfile);
461 break;
462 case N_ABS | N_EXT:
463 ms_type = mst_abs;
464 section = -1;
465 bfd_section = NULL;
466 break;
467 #ifdef N_SETV
468 case N_SETV | N_EXT:
469 ms_type = mst_data;
470 section = SECT_OFF_DATA (objfile);
471 bfd_section = DBX_DATA_SECTION (objfile);
472 break;
473 case N_SETV:
474 /* I don't think this type actually exists; since a N_SETV is the result
475 of going over many .o files, it doesn't make sense to have one
476 file local. */
477 ms_type = mst_file_data;
478 section = SECT_OFF_DATA (objfile);
479 bfd_section = DBX_DATA_SECTION (objfile);
480 break;
481 #endif
482 case N_TEXT:
483 case N_NBTEXT:
484 case N_FN:
485 case N_FN_SEQ:
486 ms_type = mst_file_text;
487 section = SECT_OFF_TEXT (objfile);
488 bfd_section = DBX_TEXT_SECTION (objfile);
489 break;
490 case N_DATA:
491 ms_type = mst_file_data;
492
493 /* Check for __DYNAMIC, which is used by Sun shared libraries.
494 Record it as global even if it's local, not global, so
495 lookup_minimal_symbol can find it. We don't check symbol_leading_char
496 because for SunOS4 it always is '_'. */
497 if (name[8] == 'C' && strcmp ("__DYNAMIC", name) == 0)
498 ms_type = mst_data;
499
500 /* Same with virtual function tables, both global and static. */
501 {
502 char *tempstring = name;
503
504 if (tempstring[0] == bfd_get_symbol_leading_char (objfile->obfd))
505 ++tempstring;
506 if (is_vtable_name (tempstring))
507 ms_type = mst_data;
508 }
509 section = SECT_OFF_DATA (objfile);
510 bfd_section = DBX_DATA_SECTION (objfile);
511 break;
512 case N_BSS:
513 ms_type = mst_file_bss;
514 section = SECT_OFF_BSS (objfile);
515 bfd_section = DBX_BSS_SECTION (objfile);
516 break;
517 default:
518 ms_type = mst_unknown;
519 section = -1;
520 bfd_section = NULL;
521 break;
522 }
523
524 if ((ms_type == mst_file_text || ms_type == mst_text)
525 && address < lowest_text_address)
526 lowest_text_address = address;
527
528 prim_record_minimal_symbol_and_info
529 (name, address, ms_type, section, bfd_section, objfile);
530 }
531
532 /* Scan and build partial symbols for a symbol file.
533 We have been initialized by a call to dbx_symfile_init, which
534 put all the relevant info into a "struct dbx_symfile_info",
535 hung off the objfile structure. */
536
537 static void
dbx_symfile_read(struct objfile * objfile,int symfile_flags)538 dbx_symfile_read (struct objfile *objfile, int symfile_flags)
539 {
540 bfd *sym_bfd;
541 int val;
542 struct cleanup *back_to;
543
544 sym_bfd = objfile->obfd;
545
546 /* .o and .nlm files are relocatables with text, data and bss segs based at
547 0. This flag disables special (Solaris stabs-in-elf only) fixups for
548 symbols with a value of 0. */
549
550 symfile_relocatable = bfd_get_file_flags (sym_bfd) & HAS_RELOC;
551
552 /* This is true for Solaris (and all other systems which put stabs
553 in sections, hopefully, since it would be silly to do things
554 differently from Solaris), and false for SunOS4 and other a.out
555 file formats. */
556 block_address_function_relative =
557 ((0 == strncmp (bfd_get_target (sym_bfd), "elf", 3))
558 || (0 == strncmp (bfd_get_target (sym_bfd), "som", 3))
559 || (0 == strncmp (bfd_get_target (sym_bfd), "coff", 4))
560 || (0 == strncmp (bfd_get_target (sym_bfd), "pe", 2))
561 || (0 == strncmp (bfd_get_target (sym_bfd), "epoc-pe", 7))
562 || (0 == strncmp (bfd_get_target (sym_bfd), "nlm", 3)));
563
564 val = bfd_seek (sym_bfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET);
565 if (val < 0)
566 perror_with_name (objfile->name);
567
568 /* Size the symbol table. */
569 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
570 init_psymbol_list (objfile, DBX_SYMCOUNT (objfile));
571
572 symbol_size = DBX_SYMBOL_SIZE (objfile);
573 symbol_table_offset = DBX_SYMTAB_OFFSET (objfile);
574
575 free_pending_blocks ();
576 back_to = make_cleanup (really_free_pendings, 0);
577
578 init_minimal_symbol_collection ();
579 make_cleanup_discard_minimal_symbols ();
580
581 /* Read stabs data from executable file and define symbols. */
582
583 read_dbx_symtab (objfile);
584
585 /* Add the dynamic symbols. */
586
587 read_dbx_dynamic_symtab (objfile);
588
589 /* Install any minimal symbols that have been collected as the current
590 minimal symbols for this objfile. */
591
592 install_minimal_symbols (objfile);
593
594 do_cleanups (back_to);
595 }
596
597 /* Initialize anything that needs initializing when a completely new
598 symbol file is specified (not just adding some symbols from another
599 file, e.g. a shared library). */
600
601 static void
dbx_new_init(struct objfile * ignore)602 dbx_new_init (struct objfile *ignore)
603 {
604 stabsread_new_init ();
605 buildsym_new_init ();
606 init_header_files ();
607 }
608
609
610 /* dbx_symfile_init ()
611 is the dbx-specific initialization routine for reading symbols.
612 It is passed a struct objfile which contains, among other things,
613 the BFD for the file whose symbols are being read, and a slot for a pointer
614 to "private data" which we fill with goodies.
615
616 We read the string table into malloc'd space and stash a pointer to it.
617
618 Since BFD doesn't know how to read debug symbols in a format-independent
619 way (and may never do so...), we have to do it ourselves. We will never
620 be called unless this is an a.out (or very similar) file.
621 FIXME, there should be a cleaner peephole into the BFD environment here. */
622
623 #define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */
624
625 static void
dbx_symfile_init(struct objfile * objfile)626 dbx_symfile_init (struct objfile *objfile)
627 {
628 int val;
629 bfd *sym_bfd = objfile->obfd;
630 char *name = bfd_get_filename (sym_bfd);
631 asection *text_sect;
632 unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE];
633 struct dbx_symfile_info *dbx;
634
635 /* Allocate struct to keep track of the symfile. */
636 dbx = XCNEW (struct dbx_symfile_info);
637 set_objfile_data (objfile, dbx_objfile_data_key, dbx);
638
639 DBX_TEXT_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
640 DBX_DATA_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".data");
641 DBX_BSS_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".bss");
642
643 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */
644 #define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd))
645 #define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd))
646
647 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */
648
649 DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL;
650
651 text_sect = bfd_get_section_by_name (sym_bfd, ".text");
652 if (!text_sect)
653 error (_("Can't find .text section in symbol file"));
654 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect);
655 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect);
656
657 DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd);
658 DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd);
659 DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
660
661 /* Read the string table and stash it away in the objfile_obstack.
662 When we blow away the objfile the string table goes away as well.
663 Note that gdb used to use the results of attempting to malloc the
664 string table, based on the size it read, as a form of sanity check
665 for botched byte swapping, on the theory that a byte swapped string
666 table size would be so totally bogus that the malloc would fail. Now
667 that we put in on the objfile_obstack, we can't do this since gdb gets
668 a fatal error (out of virtual memory) if the size is bogus. We can
669 however at least check to see if the size is less than the size of
670 the size field itself, or larger than the size of the entire file.
671 Note that all valid string tables have a size greater than zero, since
672 the bytes used to hold the size are included in the count. */
673
674 if (STRING_TABLE_OFFSET == 0)
675 {
676 /* It appears that with the existing bfd code, STRING_TABLE_OFFSET
677 will never be zero, even when there is no string table. This
678 would appear to be a bug in bfd. */
679 DBX_STRINGTAB_SIZE (objfile) = 0;
680 DBX_STRINGTAB (objfile) = NULL;
681 }
682 else
683 {
684 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
685 if (val < 0)
686 perror_with_name (name);
687
688 memset (size_temp, 0, sizeof (size_temp));
689 val = bfd_bread (size_temp, sizeof (size_temp), sym_bfd);
690 if (val < 0)
691 {
692 perror_with_name (name);
693 }
694 else if (val == 0)
695 {
696 /* With the existing bfd code, STRING_TABLE_OFFSET will be set to
697 EOF if there is no string table, and attempting to read the size
698 from EOF will read zero bytes. */
699 DBX_STRINGTAB_SIZE (objfile) = 0;
700 DBX_STRINGTAB (objfile) = NULL;
701 }
702 else
703 {
704 /* Read some data that would appear to be the string table size.
705 If there really is a string table, then it is probably the right
706 size. Byteswap if necessary and validate the size. Note that
707 the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some
708 random data that happened to be at STRING_TABLE_OFFSET, because
709 bfd can't tell us there is no string table, the sanity checks may
710 or may not catch this. */
711 DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp);
712
713 if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp)
714 || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
715 error (_("ridiculous string table size (%d bytes)."),
716 DBX_STRINGTAB_SIZE (objfile));
717
718 DBX_STRINGTAB (objfile) =
719 (char *) obstack_alloc (&objfile->objfile_obstack,
720 DBX_STRINGTAB_SIZE (objfile));
721 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile));
722
723 /* Now read in the string table in one big gulp. */
724
725 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
726 if (val < 0)
727 perror_with_name (name);
728 val = bfd_bread (DBX_STRINGTAB (objfile),
729 DBX_STRINGTAB_SIZE (objfile),
730 sym_bfd);
731 if (val != DBX_STRINGTAB_SIZE (objfile))
732 perror_with_name (name);
733 }
734 }
735 }
736
737 /* Perform any local cleanups required when we are done with a particular
738 objfile. I.E, we are in the process of discarding all symbol information
739 for an objfile, freeing up all memory held for it, and unlinking the
740 objfile struct from the global list of known objfiles. */
741
742 static void
dbx_symfile_finish(struct objfile * objfile)743 dbx_symfile_finish (struct objfile *objfile)
744 {
745 free_header_files ();
746 }
747
748 static void
dbx_free_symfile_info(struct objfile * objfile,void * arg)749 dbx_free_symfile_info (struct objfile *objfile, void *arg)
750 {
751 struct dbx_symfile_info *dbx = arg;
752
753 if (dbx->header_files != NULL)
754 {
755 int i = dbx->n_header_files;
756 struct header_file *hfiles = dbx->header_files;
757
758 while (--i >= 0)
759 {
760 xfree (hfiles[i].name);
761 xfree (hfiles[i].vector);
762 }
763 xfree (hfiles);
764 }
765
766 xfree (dbx);
767 }
768
769
770
771 /* Buffer for reading the symbol table entries. */
772 static struct external_nlist symbuf[4096];
773 static int symbuf_idx;
774 static int symbuf_end;
775
776 /* Name of last function encountered. Used in Solaris to approximate
777 object file boundaries. */
778 static char *last_function_name;
779
780 /* The address in memory of the string table of the object file we are
781 reading (which might not be the "main" object file, but might be a
782 shared library or some other dynamically loaded thing). This is
783 set by read_dbx_symtab when building psymtabs, and by
784 read_ofile_symtab when building symtabs, and is used only by
785 next_symbol_text. FIXME: If that is true, we don't need it when
786 building psymtabs, right? */
787 static char *stringtab_global;
788
789 /* These variables are used to control fill_symbuf when the stabs
790 symbols are not contiguous (as may be the case when a COFF file is
791 linked using --split-by-reloc). */
792 static struct stab_section_list *symbuf_sections;
793 static unsigned int symbuf_left;
794 static unsigned int symbuf_read;
795
796 /* This variable stores a global stabs buffer, if we read stabs into
797 memory in one chunk in order to process relocations. */
798 static bfd_byte *stabs_data;
799
800 /* Refill the symbol table input buffer
801 and set the variables that control fetching entries from it.
802 Reports an error if no data available.
803 This function can read past the end of the symbol table
804 (into the string table) but this does no harm. */
805
806 static void
fill_symbuf(bfd * sym_bfd)807 fill_symbuf (bfd *sym_bfd)
808 {
809 unsigned int count;
810 int nbytes;
811
812 if (stabs_data)
813 {
814 nbytes = sizeof (symbuf);
815 if (nbytes > symbuf_left)
816 nbytes = symbuf_left;
817 memcpy (symbuf, stabs_data + symbuf_read, nbytes);
818 }
819 else if (symbuf_sections == NULL)
820 {
821 count = sizeof (symbuf);
822 nbytes = bfd_bread (symbuf, count, sym_bfd);
823 }
824 else
825 {
826 if (symbuf_left <= 0)
827 {
828 file_ptr filepos = symbuf_sections->section->filepos;
829
830 if (bfd_seek (sym_bfd, filepos, SEEK_SET) != 0)
831 perror_with_name (bfd_get_filename (sym_bfd));
832 symbuf_left = bfd_section_size (sym_bfd, symbuf_sections->section);
833 symbol_table_offset = filepos - symbuf_read;
834 symbuf_sections = symbuf_sections->next;
835 }
836
837 count = symbuf_left;
838 if (count > sizeof (symbuf))
839 count = sizeof (symbuf);
840 nbytes = bfd_bread (symbuf, count, sym_bfd);
841 }
842
843 if (nbytes < 0)
844 perror_with_name (bfd_get_filename (sym_bfd));
845 else if (nbytes == 0)
846 error (_("Premature end of file reading symbol table"));
847 symbuf_end = nbytes / symbol_size;
848 symbuf_idx = 0;
849 symbuf_left -= nbytes;
850 symbuf_read += nbytes;
851 }
852
853 static void
stabs_seek(int sym_offset)854 stabs_seek (int sym_offset)
855 {
856 if (stabs_data)
857 {
858 symbuf_read += sym_offset;
859 symbuf_left -= sym_offset;
860 }
861 else
862 bfd_seek (symfile_bfd, sym_offset, SEEK_CUR);
863 }
864
865 #define INTERNALIZE_SYMBOL(intern, extern, abfd) \
866 { \
867 (intern).n_strx = bfd_h_get_32 (abfd, (extern)->e_strx); \
868 (intern).n_type = bfd_h_get_8 (abfd, (extern)->e_type); \
869 (intern).n_other = 0; \
870 (intern).n_desc = bfd_h_get_16 (abfd, (extern)->e_desc); \
871 if (bfd_get_sign_extend_vma (abfd)) \
872 (intern).n_value = bfd_h_get_signed_32 (abfd, (extern)->e_value); \
873 else \
874 (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \
875 }
876
877 /* Invariant: The symbol pointed to by symbuf_idx is the first one
878 that hasn't been swapped. Swap the symbol at the same time
879 that symbuf_idx is incremented. */
880
881 /* dbx allows the text of a symbol name to be continued into the
882 next symbol name! When such a continuation is encountered
883 (a \ at the end of the text of a name)
884 call this function to get the continuation. */
885
886 static char *
dbx_next_symbol_text(struct objfile * objfile)887 dbx_next_symbol_text (struct objfile *objfile)
888 {
889 struct internal_nlist nlist;
890
891 if (symbuf_idx == symbuf_end)
892 fill_symbuf (symfile_bfd);
893
894 symnum++;
895 INTERNALIZE_SYMBOL (nlist, &symbuf[symbuf_idx], symfile_bfd);
896 OBJSTAT (objfile, n_stabs++);
897
898 symbuf_idx++;
899
900 return nlist.n_strx + stringtab_global + file_string_table_offset;
901 }
902
903 /* Initialize the list of bincls to contain none and have some
904 allocated. */
905
906 static void
init_bincl_list(int number,struct objfile * objfile)907 init_bincl_list (int number, struct objfile *objfile)
908 {
909 bincls_allocated = number;
910 next_bincl = bincl_list = (struct header_file_location *)
911 xmalloc (bincls_allocated * sizeof (struct header_file_location));
912 }
913
914 /* Add a bincl to the list. */
915
916 static void
add_bincl_to_list(struct partial_symtab * pst,char * name,int instance)917 add_bincl_to_list (struct partial_symtab *pst, char *name, int instance)
918 {
919 if (next_bincl >= bincl_list + bincls_allocated)
920 {
921 int offset = next_bincl - bincl_list;
922
923 bincls_allocated *= 2;
924 bincl_list = (struct header_file_location *)
925 xrealloc ((char *) bincl_list,
926 bincls_allocated * sizeof (struct header_file_location));
927 next_bincl = bincl_list + offset;
928 }
929 next_bincl->pst = pst;
930 next_bincl->instance = instance;
931 next_bincl++->name = name;
932 }
933
934 /* Given a name, value pair, find the corresponding
935 bincl in the list. Return the partial symtab associated
936 with that header_file_location. */
937
938 static struct partial_symtab *
find_corresponding_bincl_psymtab(char * name,int instance)939 find_corresponding_bincl_psymtab (char *name, int instance)
940 {
941 struct header_file_location *bincl;
942
943 for (bincl = bincl_list; bincl < next_bincl; bincl++)
944 if (bincl->instance == instance
945 && strcmp (name, bincl->name) == 0)
946 return bincl->pst;
947
948 repeated_header_complaint (name, symnum);
949 return (struct partial_symtab *) 0;
950 }
951
952 /* Free the storage allocated for the bincl list. */
953
954 static void
free_bincl_list(struct objfile * objfile)955 free_bincl_list (struct objfile *objfile)
956 {
957 xfree (bincl_list);
958 bincls_allocated = 0;
959 }
960
961 static void
do_free_bincl_list_cleanup(void * objfile)962 do_free_bincl_list_cleanup (void *objfile)
963 {
964 free_bincl_list (objfile);
965 }
966
967 static struct cleanup *
make_cleanup_free_bincl_list(struct objfile * objfile)968 make_cleanup_free_bincl_list (struct objfile *objfile)
969 {
970 return make_cleanup (do_free_bincl_list_cleanup, objfile);
971 }
972
973 /* Set namestring based on nlist. If the string table index is invalid,
974 give a fake name, and print a single error message per symbol file read,
975 rather than abort the symbol reading or flood the user with messages. */
976
977 static char *
set_namestring(struct objfile * objfile,const struct internal_nlist * nlist)978 set_namestring (struct objfile *objfile, const struct internal_nlist *nlist)
979 {
980 char *namestring;
981
982 if (nlist->n_strx + file_string_table_offset
983 >= DBX_STRINGTAB_SIZE (objfile)
984 || nlist->n_strx + file_string_table_offset < nlist->n_strx)
985 {
986 complaint (&symfile_complaints,
987 _("bad string table offset in symbol %d"),
988 symnum);
989 namestring = "<bad string table offset>";
990 }
991 else
992 namestring = (nlist->n_strx + file_string_table_offset
993 + DBX_STRINGTAB (objfile));
994 return namestring;
995 }
996
997 /* Scan a SunOs dynamic symbol table for symbols of interest and
998 add them to the minimal symbol table. */
999
1000 static void
read_dbx_dynamic_symtab(struct objfile * objfile)1001 read_dbx_dynamic_symtab (struct objfile *objfile)
1002 {
1003 bfd *abfd = objfile->obfd;
1004 struct cleanup *back_to;
1005 int counter;
1006 long dynsym_size;
1007 long dynsym_count;
1008 asymbol **dynsyms;
1009 asymbol **symptr;
1010 arelent **relptr;
1011 long dynrel_size;
1012 long dynrel_count;
1013 arelent **dynrels;
1014 CORE_ADDR sym_value;
1015 char *name;
1016
1017 /* Check that the symbol file has dynamic symbols that we know about.
1018 bfd_arch_unknown can happen if we are reading a sun3 symbol file
1019 on a sun4 host (and vice versa) and bfd is not configured
1020 --with-target=all. This would trigger an assertion in bfd/sunos.c,
1021 so we ignore the dynamic symbols in this case. */
1022 if (bfd_get_flavour (abfd) != bfd_target_aout_flavour
1023 || (bfd_get_file_flags (abfd) & DYNAMIC) == 0
1024 || bfd_get_arch (abfd) == bfd_arch_unknown)
1025 return;
1026
1027 dynsym_size = bfd_get_dynamic_symtab_upper_bound (abfd);
1028 if (dynsym_size < 0)
1029 return;
1030
1031 dynsyms = (asymbol **) xmalloc (dynsym_size);
1032 back_to = make_cleanup (xfree, dynsyms);
1033
1034 dynsym_count = bfd_canonicalize_dynamic_symtab (abfd, dynsyms);
1035 if (dynsym_count < 0)
1036 {
1037 do_cleanups (back_to);
1038 return;
1039 }
1040
1041 /* Enter dynamic symbols into the minimal symbol table
1042 if this is a stripped executable. */
1043 if (bfd_get_symcount (abfd) <= 0)
1044 {
1045 symptr = dynsyms;
1046 for (counter = 0; counter < dynsym_count; counter++, symptr++)
1047 {
1048 asymbol *sym = *symptr;
1049 asection *sec;
1050 int type;
1051
1052 sec = bfd_get_section (sym);
1053
1054 /* BFD symbols are section relative. */
1055 sym_value = sym->value + sec->vma;
1056
1057 if (bfd_get_section_flags (abfd, sec) & SEC_CODE)
1058 {
1059 sym_value += ANOFFSET (objfile->section_offsets,
1060 SECT_OFF_TEXT (objfile));
1061 type = N_TEXT;
1062 }
1063 else if (bfd_get_section_flags (abfd, sec) & SEC_DATA)
1064 {
1065 sym_value += ANOFFSET (objfile->section_offsets,
1066 SECT_OFF_DATA (objfile));
1067 type = N_DATA;
1068 }
1069 else if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
1070 {
1071 sym_value += ANOFFSET (objfile->section_offsets,
1072 SECT_OFF_BSS (objfile));
1073 type = N_BSS;
1074 }
1075 else
1076 continue;
1077
1078 if (sym->flags & BSF_GLOBAL)
1079 type |= N_EXT;
1080
1081 record_minimal_symbol ((char *) bfd_asymbol_name (sym), sym_value,
1082 type, objfile);
1083 }
1084 }
1085
1086 /* Symbols from shared libraries have a dynamic relocation entry
1087 that points to the associated slot in the procedure linkage table.
1088 We make a mininal symbol table entry with type mst_solib_trampoline
1089 at the address in the procedure linkage table. */
1090 dynrel_size = bfd_get_dynamic_reloc_upper_bound (abfd);
1091 if (dynrel_size < 0)
1092 {
1093 do_cleanups (back_to);
1094 return;
1095 }
1096
1097 dynrels = (arelent **) xmalloc (dynrel_size);
1098 make_cleanup (xfree, dynrels);
1099
1100 dynrel_count = bfd_canonicalize_dynamic_reloc (abfd, dynrels, dynsyms);
1101 if (dynrel_count < 0)
1102 {
1103 do_cleanups (back_to);
1104 return;
1105 }
1106
1107 for (counter = 0, relptr = dynrels;
1108 counter < dynrel_count;
1109 counter++, relptr++)
1110 {
1111 arelent *rel = *relptr;
1112 CORE_ADDR address =
1113 rel->address + ANOFFSET (objfile->section_offsets,
1114 SECT_OFF_DATA (objfile));
1115
1116 switch (bfd_get_arch (abfd))
1117 {
1118 case bfd_arch_sparc:
1119 if (rel->howto->type != RELOC_JMP_SLOT)
1120 continue;
1121 break;
1122 case bfd_arch_m68k:
1123 /* `16' is the type BFD produces for a jump table relocation. */
1124 if (rel->howto->type != 16)
1125 continue;
1126
1127 /* Adjust address in the jump table to point to
1128 the start of the bsr instruction. */
1129 address -= 2;
1130 break;
1131 default:
1132 continue;
1133 }
1134
1135 name = (char *) bfd_asymbol_name (*rel->sym_ptr_ptr);
1136 prim_record_minimal_symbol (name, address, mst_solib_trampoline,
1137 objfile);
1138 }
1139
1140 do_cleanups (back_to);
1141 }
1142
1143 static CORE_ADDR
find_stab_function_addr(char * namestring,const char * filename,struct objfile * objfile)1144 find_stab_function_addr (char *namestring, const char *filename,
1145 struct objfile *objfile)
1146 {
1147 struct minimal_symbol *msym;
1148 char *p;
1149 int n;
1150
1151 p = strchr (namestring, ':');
1152 if (p == NULL)
1153 p = namestring;
1154 n = p - namestring;
1155 p = alloca (n + 2);
1156 strncpy (p, namestring, n);
1157 p[n] = 0;
1158
1159 msym = lookup_minimal_symbol (p, filename, objfile);
1160 if (msym == NULL)
1161 {
1162 /* Sun Fortran appends an underscore to the minimal symbol name,
1163 try again with an appended underscore if the minimal symbol
1164 was not found. */
1165 p[n] = '_';
1166 p[n + 1] = 0;
1167 msym = lookup_minimal_symbol (p, filename, objfile);
1168 }
1169
1170 if (msym == NULL && filename != NULL)
1171 {
1172 /* Try again without the filename. */
1173 p[n] = 0;
1174 msym = lookup_minimal_symbol (p, NULL, objfile);
1175 }
1176 if (msym == NULL && filename != NULL)
1177 {
1178 /* And try again for Sun Fortran, but without the filename. */
1179 p[n] = '_';
1180 p[n + 1] = 0;
1181 msym = lookup_minimal_symbol (p, NULL, objfile);
1182 }
1183
1184 return msym == NULL ? 0 : SYMBOL_VALUE_ADDRESS (msym);
1185 }
1186
1187 static void
function_outside_compilation_unit_complaint(const char * arg1)1188 function_outside_compilation_unit_complaint (const char *arg1)
1189 {
1190 complaint (&symfile_complaints,
1191 _("function `%s' appears to be defined "
1192 "outside of all compilation units"),
1193 arg1);
1194 }
1195
1196 /* Setup partial_symtab's describing each source file for which
1197 debugging information is available. */
1198
1199 static void
read_dbx_symtab(struct objfile * objfile)1200 read_dbx_symtab (struct objfile *objfile)
1201 {
1202 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1203 struct external_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch. */
1204 struct internal_nlist nlist;
1205 CORE_ADDR text_addr;
1206 int text_size;
1207 char *sym_name;
1208 int sym_len;
1209
1210 char *namestring;
1211 int nsl;
1212 int past_first_source_file = 0;
1213 CORE_ADDR last_o_file_start = 0;
1214 CORE_ADDR last_function_start = 0;
1215 struct cleanup *back_to;
1216 bfd *abfd;
1217 int textlow_not_set;
1218 int data_sect_index;
1219
1220 /* Current partial symtab. */
1221 struct partial_symtab *pst;
1222
1223 /* List of current psymtab's include files. */
1224 const char **psymtab_include_list;
1225 int includes_allocated;
1226 int includes_used;
1227
1228 /* Index within current psymtab dependency list. */
1229 struct partial_symtab **dependency_list;
1230 int dependencies_used, dependencies_allocated;
1231
1232 text_addr = DBX_TEXT_ADDR (objfile);
1233 text_size = DBX_TEXT_SIZE (objfile);
1234
1235 /* FIXME. We probably want to change stringtab_global rather than add this
1236 while processing every symbol entry. FIXME. */
1237 file_string_table_offset = 0;
1238 next_file_string_table_offset = 0;
1239
1240 stringtab_global = DBX_STRINGTAB (objfile);
1241
1242 pst = (struct partial_symtab *) 0;
1243
1244 includes_allocated = 30;
1245 includes_used = 0;
1246 psymtab_include_list = (const char **) alloca (includes_allocated *
1247 sizeof (const char *));
1248
1249 dependencies_allocated = 30;
1250 dependencies_used = 0;
1251 dependency_list =
1252 (struct partial_symtab **) alloca (dependencies_allocated *
1253 sizeof (struct partial_symtab *));
1254
1255 /* Init bincl list */
1256 init_bincl_list (20, objfile);
1257 back_to = make_cleanup_free_bincl_list (objfile);
1258
1259 set_last_source_file (NULL);
1260
1261 lowest_text_address = (CORE_ADDR) -1;
1262
1263 symfile_bfd = objfile->obfd; /* For next_text_symbol. */
1264 abfd = objfile->obfd;
1265 symbuf_end = symbuf_idx = 0;
1266 next_symbol_text_func = dbx_next_symbol_text;
1267 textlow_not_set = 1;
1268 has_line_numbers = 0;
1269
1270 /* FIXME: jimb/2003-09-12: We don't apply the right section's offset
1271 to global and static variables. The stab for a global or static
1272 variable doesn't give us any indication of which section it's in,
1273 so we can't tell immediately which offset in
1274 objfile->section_offsets we should apply to the variable's
1275 address.
1276
1277 We could certainly find out which section contains the variable
1278 by looking up the variable's unrelocated address with
1279 find_pc_section, but that would be expensive; this is the
1280 function that constructs the partial symbol tables by examining
1281 every symbol in the entire executable, and it's
1282 performance-critical. So that expense would not be welcome. I'm
1283 not sure what to do about this at the moment.
1284
1285 What we have done for years is to simply assume that the .data
1286 section's offset is appropriate for all global and static
1287 variables. Recently, this was expanded to fall back to the .bss
1288 section's offset if there is no .data section, and then to the
1289 .rodata section's offset. */
1290 data_sect_index = objfile->sect_index_data;
1291 if (data_sect_index == -1)
1292 data_sect_index = SECT_OFF_BSS (objfile);
1293 if (data_sect_index == -1)
1294 data_sect_index = SECT_OFF_RODATA (objfile);
1295
1296 /* If data_sect_index is still -1, that's okay. It's perfectly fine
1297 for the file to have no .data, no .bss, and no .text at all, if
1298 it also has no global or static variables. If it does, we will
1299 get an internal error from an ANOFFSET macro below when we try to
1300 use data_sect_index. */
1301
1302 for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++)
1303 {
1304 /* Get the symbol for this run and pull out some info. */
1305 QUIT; /* Allow this to be interruptable. */
1306 if (symbuf_idx == symbuf_end)
1307 fill_symbuf (abfd);
1308 bufp = &symbuf[symbuf_idx++];
1309
1310 /*
1311 * Special case to speed up readin.
1312 */
1313 if (bfd_h_get_8 (abfd, bufp->e_type) == N_SLINE)
1314 {
1315 has_line_numbers = 1;
1316 continue;
1317 }
1318
1319 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
1320 OBJSTAT (objfile, n_stabs++);
1321
1322 /* Ok. There is a lot of code duplicated in the rest of this
1323 switch statement (for efficiency reasons). Since I don't
1324 like duplicating code, I will do my penance here, and
1325 describe the code which is duplicated:
1326
1327 *) The assignment to namestring.
1328 *) The call to strchr.
1329 *) The addition of a partial symbol the two partial
1330 symbol lists. This last is a large section of code, so
1331 I've imbedded it in the following macro. */
1332
1333 switch (nlist.n_type)
1334 {
1335 /*
1336 * Standard, external, non-debugger, symbols
1337 */
1338
1339 case N_TEXT | N_EXT:
1340 case N_NBTEXT | N_EXT:
1341 nlist.n_value += ANOFFSET (objfile->section_offsets,
1342 SECT_OFF_TEXT (objfile));
1343 goto record_it;
1344
1345 case N_DATA | N_EXT:
1346 case N_NBDATA | N_EXT:
1347 nlist.n_value += ANOFFSET (objfile->section_offsets,
1348 SECT_OFF_DATA (objfile));
1349 goto record_it;
1350
1351 case N_BSS:
1352 case N_BSS | N_EXT:
1353 case N_NBBSS | N_EXT:
1354 case N_SETV | N_EXT: /* FIXME, is this in BSS? */
1355 nlist.n_value += ANOFFSET (objfile->section_offsets,
1356 SECT_OFF_BSS (objfile));
1357 goto record_it;
1358
1359 case N_ABS | N_EXT:
1360 record_it:
1361 namestring = set_namestring (objfile, &nlist);
1362
1363 bss_ext_symbol:
1364 record_minimal_symbol (namestring, nlist.n_value,
1365 nlist.n_type, objfile); /* Always */
1366 continue;
1367
1368 /* Standard, local, non-debugger, symbols. */
1369
1370 case N_NBTEXT:
1371
1372 /* We need to be able to deal with both N_FN or N_TEXT,
1373 because we have no way of knowing whether the sys-supplied ld
1374 or GNU ld was used to make the executable. Sequents throw
1375 in another wrinkle -- they renumbered N_FN. */
1376
1377 case N_FN:
1378 case N_FN_SEQ:
1379 case N_TEXT:
1380 nlist.n_value += ANOFFSET (objfile->section_offsets,
1381 SECT_OFF_TEXT (objfile));
1382 namestring = set_namestring (objfile, &nlist);
1383
1384 if ((namestring[0] == '-' && namestring[1] == 'l')
1385 || (namestring[(nsl = strlen (namestring)) - 1] == 'o'
1386 && namestring[nsl - 2] == '.'))
1387 {
1388 if (past_first_source_file && pst
1389 /* The gould NP1 uses low values for .o and -l symbols
1390 which are not the address. */
1391 && nlist.n_value >= pst->textlow)
1392 {
1393 end_psymtab (objfile, pst, psymtab_include_list,
1394 includes_used, symnum * symbol_size,
1395 nlist.n_value > pst->texthigh
1396 ? nlist.n_value : pst->texthigh,
1397 dependency_list, dependencies_used,
1398 textlow_not_set);
1399 pst = (struct partial_symtab *) 0;
1400 includes_used = 0;
1401 dependencies_used = 0;
1402 has_line_numbers = 0;
1403 }
1404 else
1405 past_first_source_file = 1;
1406 last_o_file_start = nlist.n_value;
1407 }
1408 else
1409 goto record_it;
1410 continue;
1411
1412 case N_DATA:
1413 nlist.n_value += ANOFFSET (objfile->section_offsets,
1414 SECT_OFF_DATA (objfile));
1415 goto record_it;
1416
1417 case N_UNDF | N_EXT:
1418 /* The case (nlist.n_value != 0) is a "Fortran COMMON" symbol.
1419 We used to rely on the target to tell us whether it knows
1420 where the symbol has been relocated to, but none of the
1421 target implementations actually provided that operation.
1422 So we just ignore the symbol, the same way we would do if
1423 we had a target-side symbol lookup which returned no match.
1424
1425 All other symbols (with nlist.n_value == 0), are really
1426 undefined, and so we ignore them too. */
1427 continue;
1428
1429 case N_UNDF:
1430 if (processing_acc_compilation && nlist.n_strx == 1)
1431 {
1432 /* Deal with relative offsets in the string table
1433 used in ELF+STAB under Solaris. If we want to use the
1434 n_strx field, which contains the name of the file,
1435 we must adjust file_string_table_offset *before* calling
1436 set_namestring(). */
1437 past_first_source_file = 1;
1438 file_string_table_offset = next_file_string_table_offset;
1439 next_file_string_table_offset =
1440 file_string_table_offset + nlist.n_value;
1441 if (next_file_string_table_offset < file_string_table_offset)
1442 error (_("string table offset backs up at %d"), symnum);
1443 /* FIXME -- replace error() with complaint. */
1444 continue;
1445 }
1446 continue;
1447
1448 /* Lots of symbol types we can just ignore. */
1449
1450 case N_ABS:
1451 case N_NBDATA:
1452 case N_NBBSS:
1453 continue;
1454
1455 /* Keep going . . . */
1456
1457 /*
1458 * Special symbol types for GNU
1459 */
1460 case N_INDR:
1461 case N_INDR | N_EXT:
1462 case N_SETA:
1463 case N_SETA | N_EXT:
1464 case N_SETT:
1465 case N_SETT | N_EXT:
1466 case N_SETD:
1467 case N_SETD | N_EXT:
1468 case N_SETB:
1469 case N_SETB | N_EXT:
1470 case N_SETV:
1471 continue;
1472
1473 /*
1474 * Debugger symbols
1475 */
1476
1477 case N_SO:
1478 {
1479 CORE_ADDR valu;
1480 static int prev_so_symnum = -10;
1481 static int first_so_symnum;
1482 const char *p;
1483 static char *dirname_nso;
1484 int prev_textlow_not_set;
1485
1486 valu = nlist.n_value + ANOFFSET (objfile->section_offsets,
1487 SECT_OFF_TEXT (objfile));
1488
1489 prev_textlow_not_set = textlow_not_set;
1490
1491 /* A zero value is probably an indication for the SunPRO 3.0
1492 compiler. end_psymtab explicitly tests for zero, so
1493 don't relocate it. */
1494
1495 if (nlist.n_value == 0
1496 && gdbarch_sofun_address_maybe_missing (gdbarch))
1497 {
1498 textlow_not_set = 1;
1499 valu = 0;
1500 }
1501 else
1502 textlow_not_set = 0;
1503
1504 past_first_source_file = 1;
1505
1506 if (prev_so_symnum != symnum - 1)
1507 { /* Here if prev stab wasn't N_SO. */
1508 first_so_symnum = symnum;
1509
1510 if (pst)
1511 {
1512 end_psymtab (objfile, pst, psymtab_include_list,
1513 includes_used, symnum * symbol_size,
1514 valu > pst->texthigh ? valu : pst->texthigh,
1515 dependency_list, dependencies_used,
1516 prev_textlow_not_set);
1517 pst = (struct partial_symtab *) 0;
1518 includes_used = 0;
1519 dependencies_used = 0;
1520 has_line_numbers = 0;
1521 }
1522 }
1523
1524 prev_so_symnum = symnum;
1525
1526 /* End the current partial symtab and start a new one. */
1527
1528 namestring = set_namestring (objfile, &nlist);
1529
1530 /* Null name means end of .o file. Don't start a new one. */
1531 if (*namestring == '\000')
1532 continue;
1533
1534 /* Some compilers (including gcc) emit a pair of initial N_SOs.
1535 The first one is a directory name; the second the file name.
1536 If pst exists, is empty, and has a filename ending in '/',
1537 we assume the previous N_SO was a directory name. */
1538
1539 p = lbasename (namestring);
1540 if (p != namestring && *p == '\000')
1541 {
1542 /* Save the directory name SOs locally, then save it into
1543 the psymtab when it's created below. */
1544 dirname_nso = namestring;
1545 continue;
1546 }
1547
1548 /* Some other compilers (C++ ones in particular) emit useless
1549 SOs for non-existant .c files. We ignore all subsequent SOs
1550 that immediately follow the first. */
1551
1552 if (!pst)
1553 {
1554 pst = start_psymtab (objfile,
1555 namestring, valu,
1556 first_so_symnum * symbol_size,
1557 objfile->global_psymbols.next,
1558 objfile->static_psymbols.next);
1559 pst->dirname = dirname_nso;
1560 dirname_nso = NULL;
1561 }
1562 continue;
1563 }
1564
1565 case N_BINCL:
1566 {
1567 enum language tmp_language;
1568
1569 /* Add this bincl to the bincl_list for future EXCLs. No
1570 need to save the string; it'll be around until
1571 read_dbx_symtab function returns. */
1572
1573 namestring = set_namestring (objfile, &nlist);
1574 tmp_language = deduce_language_from_filename (namestring);
1575
1576 /* Only change the psymtab's language if we've learned
1577 something useful (eg. tmp_language is not language_unknown).
1578 In addition, to match what start_subfile does, never change
1579 from C++ to C. */
1580 if (tmp_language != language_unknown
1581 && (tmp_language != language_c
1582 || psymtab_language != language_cplus))
1583 psymtab_language = tmp_language;
1584
1585 if (pst == NULL)
1586 {
1587 /* FIXME: we should not get here without a PST to work on.
1588 Attempt to recover. */
1589 complaint (&symfile_complaints,
1590 _("N_BINCL %s not in entries for "
1591 "any file, at symtab pos %d"),
1592 namestring, symnum);
1593 continue;
1594 }
1595 add_bincl_to_list (pst, namestring, nlist.n_value);
1596
1597 /* Mark down an include file in the current psymtab. */
1598
1599 goto record_include_file;
1600 }
1601
1602 case N_SOL:
1603 {
1604 enum language tmp_language;
1605
1606 /* Mark down an include file in the current psymtab. */
1607 namestring = set_namestring (objfile, &nlist);
1608 tmp_language = deduce_language_from_filename (namestring);
1609
1610 /* Only change the psymtab's language if we've learned
1611 something useful (eg. tmp_language is not language_unknown).
1612 In addition, to match what start_subfile does, never change
1613 from C++ to C. */
1614 if (tmp_language != language_unknown
1615 && (tmp_language != language_c
1616 || psymtab_language != language_cplus))
1617 psymtab_language = tmp_language;
1618
1619 /* In C++, one may expect the same filename to come round many
1620 times, when code is coming alternately from the main file
1621 and from inline functions in other files. So I check to see
1622 if this is a file we've seen before -- either the main
1623 source file, or a previously included file.
1624
1625 This seems to be a lot of time to be spending on N_SOL, but
1626 things like "break c-exp.y:435" need to work (I
1627 suppose the psymtab_include_list could be hashed or put
1628 in a binary tree, if profiling shows this is a major hog). */
1629 if (pst && filename_cmp (namestring, pst->filename) == 0)
1630 continue;
1631 {
1632 int i;
1633
1634 for (i = 0; i < includes_used; i++)
1635 if (filename_cmp (namestring, psymtab_include_list[i]) == 0)
1636 {
1637 i = -1;
1638 break;
1639 }
1640 if (i == -1)
1641 continue;
1642 }
1643
1644 record_include_file:
1645
1646 psymtab_include_list[includes_used++] = namestring;
1647 if (includes_used >= includes_allocated)
1648 {
1649 const char **orig = psymtab_include_list;
1650
1651 psymtab_include_list = (const char **)
1652 alloca ((includes_allocated *= 2) * sizeof (const char *));
1653 memcpy (psymtab_include_list, orig,
1654 includes_used * sizeof (const char *));
1655 }
1656 continue;
1657 }
1658 case N_LSYM: /* Typedef or automatic variable. */
1659 case N_STSYM: /* Data seg var -- static. */
1660 case N_LCSYM: /* BSS " */
1661 case N_ROSYM: /* Read-only data seg var -- static. */
1662 case N_NBSTS: /* Gould nobase. */
1663 case N_NBLCS: /* symbols. */
1664 case N_FUN:
1665 case N_GSYM: /* Global (extern) variable; can be
1666 data or bss (sigh FIXME). */
1667
1668 /* Following may probably be ignored; I'll leave them here
1669 for now (until I do Pascal and Modula 2 extensions). */
1670
1671 case N_PC: /* I may or may not need this; I
1672 suspect not. */
1673 case N_M2C: /* I suspect that I can ignore this here. */
1674 case N_SCOPE: /* Same. */
1675 {
1676 char *p;
1677
1678 namestring = set_namestring (objfile, &nlist);
1679
1680 /* See if this is an end of function stab. */
1681 if (pst && nlist.n_type == N_FUN && *namestring == '\000')
1682 {
1683 CORE_ADDR valu;
1684
1685 /* It's value is the size (in bytes) of the function for
1686 function relative stabs, or the address of the function's
1687 end for old style stabs. */
1688 valu = nlist.n_value + last_function_start;
1689 if (pst->texthigh == 0 || valu > pst->texthigh)
1690 pst->texthigh = valu;
1691 break;
1692 }
1693
1694 p = (char *) strchr (namestring, ':');
1695 if (!p)
1696 continue; /* Not a debugging symbol. */
1697
1698 sym_len = 0;
1699 sym_name = NULL; /* pacify "gcc -Werror" */
1700 if (psymtab_language == language_cplus)
1701 {
1702 char *new_name, *name = xmalloc (p - namestring + 1);
1703 memcpy (name, namestring, p - namestring);
1704
1705 name[p - namestring] = '\0';
1706 new_name = cp_canonicalize_string (name);
1707 if (new_name != NULL)
1708 {
1709 sym_len = strlen (new_name);
1710 sym_name = obstack_copy0 (&objfile->objfile_obstack,
1711 new_name, sym_len);
1712 xfree (new_name);
1713 }
1714 xfree (name);
1715 }
1716
1717 if (sym_len == 0)
1718 {
1719 sym_name = namestring;
1720 sym_len = p - namestring;
1721 }
1722
1723 /* Main processing section for debugging symbols which
1724 the initial read through the symbol tables needs to worry
1725 about. If we reach this point, the symbol which we are
1726 considering is definitely one we are interested in.
1727 p must also contain the (valid) index into the namestring
1728 which indicates the debugging type symbol. */
1729
1730 switch (p[1])
1731 {
1732 case 'S':
1733 nlist.n_value += ANOFFSET (objfile->section_offsets,
1734 data_sect_index);
1735
1736 if (gdbarch_static_transform_name_p (gdbarch))
1737 gdbarch_static_transform_name (gdbarch, namestring);
1738
1739 add_psymbol_to_list (sym_name, sym_len, 1,
1740 VAR_DOMAIN, LOC_STATIC,
1741 &objfile->static_psymbols,
1742 0, nlist.n_value,
1743 psymtab_language, objfile);
1744 continue;
1745
1746 case 'G':
1747 nlist.n_value += ANOFFSET (objfile->section_offsets,
1748 data_sect_index);
1749 /* The addresses in these entries are reported to be
1750 wrong. See the code that reads 'G's for symtabs. */
1751 add_psymbol_to_list (sym_name, sym_len, 1,
1752 VAR_DOMAIN, LOC_STATIC,
1753 &objfile->global_psymbols,
1754 0, nlist.n_value,
1755 psymtab_language, objfile);
1756 continue;
1757
1758 case 'T':
1759 /* When a 'T' entry is defining an anonymous enum, it
1760 may have a name which is the empty string, or a
1761 single space. Since they're not really defining a
1762 symbol, those shouldn't go in the partial symbol
1763 table. We do pick up the elements of such enums at
1764 'check_enum:', below. */
1765 if (p >= namestring + 2
1766 || (p == namestring + 1
1767 && namestring[0] != ' '))
1768 {
1769 add_psymbol_to_list (sym_name, sym_len, 1,
1770 STRUCT_DOMAIN, LOC_TYPEDEF,
1771 &objfile->static_psymbols,
1772 nlist.n_value, 0,
1773 psymtab_language, objfile);
1774 if (p[2] == 't')
1775 {
1776 /* Also a typedef with the same name. */
1777 add_psymbol_to_list (sym_name, sym_len, 1,
1778 VAR_DOMAIN, LOC_TYPEDEF,
1779 &objfile->static_psymbols,
1780 nlist.n_value, 0,
1781 psymtab_language, objfile);
1782 p += 1;
1783 }
1784 }
1785 goto check_enum;
1786
1787 case 't':
1788 if (p != namestring) /* a name is there, not just :T... */
1789 {
1790 add_psymbol_to_list (sym_name, sym_len, 1,
1791 VAR_DOMAIN, LOC_TYPEDEF,
1792 &objfile->static_psymbols,
1793 nlist.n_value, 0,
1794 psymtab_language, objfile);
1795 }
1796 check_enum:
1797 /* If this is an enumerated type, we need to
1798 add all the enum constants to the partial symbol
1799 table. This does not cover enums without names, e.g.
1800 "enum {a, b} c;" in C, but fortunately those are
1801 rare. There is no way for GDB to find those from the
1802 enum type without spending too much time on it. Thus
1803 to solve this problem, the compiler needs to put out the
1804 enum in a nameless type. GCC2 does this. */
1805
1806 /* We are looking for something of the form
1807 <name> ":" ("t" | "T") [<number> "="] "e"
1808 {<constant> ":" <value> ","} ";". */
1809
1810 /* Skip over the colon and the 't' or 'T'. */
1811 p += 2;
1812 /* This type may be given a number. Also, numbers can come
1813 in pairs like (0,26). Skip over it. */
1814 while ((*p >= '0' && *p <= '9')
1815 || *p == '(' || *p == ',' || *p == ')'
1816 || *p == '=')
1817 p++;
1818
1819 if (*p++ == 'e')
1820 {
1821 /* The aix4 compiler emits extra crud before the members. */
1822 if (*p == '-')
1823 {
1824 /* Skip over the type (?). */
1825 while (*p != ':')
1826 p++;
1827
1828 /* Skip over the colon. */
1829 p++;
1830 }
1831
1832 /* We have found an enumerated type. */
1833 /* According to comments in read_enum_type
1834 a comma could end it instead of a semicolon.
1835 I don't know where that happens.
1836 Accept either. */
1837 while (*p && *p != ';' && *p != ',')
1838 {
1839 char *q;
1840
1841 /* Check for and handle cretinous dbx symbol name
1842 continuation! */
1843 if (*p == '\\' || (*p == '?' && p[1] == '\0'))
1844 p = next_symbol_text (objfile);
1845
1846 /* Point to the character after the name
1847 of the enum constant. */
1848 for (q = p; *q && *q != ':'; q++)
1849 ;
1850 /* Note that the value doesn't matter for
1851 enum constants in psymtabs, just in symtabs. */
1852 add_psymbol_to_list (p, q - p, 1,
1853 VAR_DOMAIN, LOC_CONST,
1854 &objfile->static_psymbols, 0,
1855 0, psymtab_language, objfile);
1856 /* Point past the name. */
1857 p = q;
1858 /* Skip over the value. */
1859 while (*p && *p != ',')
1860 p++;
1861 /* Advance past the comma. */
1862 if (*p)
1863 p++;
1864 }
1865 }
1866 continue;
1867
1868 case 'c':
1869 /* Constant, e.g. from "const" in Pascal. */
1870 add_psymbol_to_list (sym_name, sym_len, 1,
1871 VAR_DOMAIN, LOC_CONST,
1872 &objfile->static_psymbols, nlist.n_value,
1873 0, psymtab_language, objfile);
1874 continue;
1875
1876 case 'f':
1877 if (! pst)
1878 {
1879 int name_len = p - namestring;
1880 char *name = xmalloc (name_len + 1);
1881
1882 memcpy (name, namestring, name_len);
1883 name[name_len] = '\0';
1884 function_outside_compilation_unit_complaint (name);
1885 xfree (name);
1886 }
1887 nlist.n_value += ANOFFSET (objfile->section_offsets,
1888 SECT_OFF_TEXT (objfile));
1889 /* Kludges for ELF/STABS with Sun ACC. */
1890 last_function_name = namestring;
1891 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
1892 value for the bottom of the text seg in those cases. */
1893 if (nlist.n_value == ANOFFSET (objfile->section_offsets,
1894 SECT_OFF_TEXT (objfile))
1895 && gdbarch_sofun_address_maybe_missing (gdbarch))
1896 {
1897 CORE_ADDR minsym_valu =
1898 find_stab_function_addr (namestring,
1899 pst ? pst->filename : NULL,
1900 objfile);
1901
1902 /* find_stab_function_addr will return 0 if the minimal
1903 symbol wasn't found. (Unfortunately, this might also
1904 be a valid address.) Anyway, if it *does* return 0,
1905 it is likely that the value was set correctly to begin
1906 with... */
1907 if (minsym_valu != 0)
1908 nlist.n_value = minsym_valu;
1909 }
1910 if (pst && textlow_not_set
1911 && gdbarch_sofun_address_maybe_missing (gdbarch))
1912 {
1913 pst->textlow = nlist.n_value;
1914 textlow_not_set = 0;
1915 }
1916 /* End kludge. */
1917
1918 /* Keep track of the start of the last function so we
1919 can handle end of function symbols. */
1920 last_function_start = nlist.n_value;
1921
1922 /* In reordered executables this function may lie outside
1923 the bounds created by N_SO symbols. If that's the case
1924 use the address of this function as the low bound for
1925 the partial symbol table. */
1926 if (pst
1927 && (textlow_not_set
1928 || (nlist.n_value < pst->textlow
1929 && (nlist.n_value
1930 != ANOFFSET (objfile->section_offsets,
1931 SECT_OFF_TEXT (objfile))))))
1932 {
1933 pst->textlow = nlist.n_value;
1934 textlow_not_set = 0;
1935 }
1936 add_psymbol_to_list (sym_name, sym_len, 1,
1937 VAR_DOMAIN, LOC_BLOCK,
1938 &objfile->static_psymbols,
1939 0, nlist.n_value,
1940 psymtab_language, objfile);
1941 continue;
1942
1943 /* Global functions were ignored here, but now they
1944 are put into the global psymtab like one would expect.
1945 They're also in the minimal symbol table. */
1946 case 'F':
1947 if (! pst)
1948 {
1949 int name_len = p - namestring;
1950 char *name = xmalloc (name_len + 1);
1951
1952 memcpy (name, namestring, name_len);
1953 name[name_len] = '\0';
1954 function_outside_compilation_unit_complaint (name);
1955 xfree (name);
1956 }
1957 nlist.n_value += ANOFFSET (objfile->section_offsets,
1958 SECT_OFF_TEXT (objfile));
1959 /* Kludges for ELF/STABS with Sun ACC. */
1960 last_function_name = namestring;
1961 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
1962 value for the bottom of the text seg in those cases. */
1963 if (nlist.n_value == ANOFFSET (objfile->section_offsets,
1964 SECT_OFF_TEXT (objfile))
1965 && gdbarch_sofun_address_maybe_missing (gdbarch))
1966 {
1967 CORE_ADDR minsym_valu =
1968 find_stab_function_addr (namestring,
1969 pst ? pst->filename : NULL,
1970 objfile);
1971
1972 /* find_stab_function_addr will return 0 if the minimal
1973 symbol wasn't found. (Unfortunately, this might also
1974 be a valid address.) Anyway, if it *does* return 0,
1975 it is likely that the value was set correctly to begin
1976 with... */
1977 if (minsym_valu != 0)
1978 nlist.n_value = minsym_valu;
1979 }
1980 if (pst && textlow_not_set
1981 && gdbarch_sofun_address_maybe_missing (gdbarch))
1982 {
1983 pst->textlow = nlist.n_value;
1984 textlow_not_set = 0;
1985 }
1986 /* End kludge. */
1987
1988 /* Keep track of the start of the last function so we
1989 can handle end of function symbols. */
1990 last_function_start = nlist.n_value;
1991
1992 /* In reordered executables this function may lie outside
1993 the bounds created by N_SO symbols. If that's the case
1994 use the address of this function as the low bound for
1995 the partial symbol table. */
1996 if (pst
1997 && (textlow_not_set
1998 || (nlist.n_value < pst->textlow
1999 && (nlist.n_value
2000 != ANOFFSET (objfile->section_offsets,
2001 SECT_OFF_TEXT (objfile))))))
2002 {
2003 pst->textlow = nlist.n_value;
2004 textlow_not_set = 0;
2005 }
2006 add_psymbol_to_list (sym_name, sym_len, 1,
2007 VAR_DOMAIN, LOC_BLOCK,
2008 &objfile->global_psymbols,
2009 0, nlist.n_value,
2010 psymtab_language, objfile);
2011 continue;
2012
2013 /* Two things show up here (hopefully); static symbols of
2014 local scope (static used inside braces) or extensions
2015 of structure symbols. We can ignore both. */
2016 case 'V':
2017 case '(':
2018 case '0':
2019 case '1':
2020 case '2':
2021 case '3':
2022 case '4':
2023 case '5':
2024 case '6':
2025 case '7':
2026 case '8':
2027 case '9':
2028 case '-':
2029 case '#': /* For symbol identification (used in live ranges). */
2030 continue;
2031
2032 case ':':
2033 /* It is a C++ nested symbol. We don't need to record it
2034 (I don't think); if we try to look up foo::bar::baz,
2035 then symbols for the symtab containing foo should get
2036 read in, I think. */
2037 /* Someone says sun cc puts out symbols like
2038 /foo/baz/maclib::/usr/local/bin/maclib,
2039 which would get here with a symbol type of ':'. */
2040 continue;
2041
2042 default:
2043 /* Unexpected symbol descriptor. The second and subsequent stabs
2044 of a continued stab can show up here. The question is
2045 whether they ever can mimic a normal stab--it would be
2046 nice if not, since we certainly don't want to spend the
2047 time searching to the end of every string looking for
2048 a backslash. */
2049
2050 complaint (&symfile_complaints,
2051 _("unknown symbol descriptor `%c'"),
2052 p[1]);
2053
2054 /* Ignore it; perhaps it is an extension that we don't
2055 know about. */
2056 continue;
2057 }
2058 }
2059
2060 case N_EXCL:
2061
2062 namestring = set_namestring (objfile, &nlist);
2063
2064 /* Find the corresponding bincl and mark that psymtab on the
2065 psymtab dependency list. */
2066 {
2067 struct partial_symtab *needed_pst =
2068 find_corresponding_bincl_psymtab (namestring, nlist.n_value);
2069
2070 /* If this include file was defined earlier in this file,
2071 leave it alone. */
2072 if (needed_pst == pst)
2073 continue;
2074
2075 if (needed_pst)
2076 {
2077 int i;
2078 int found = 0;
2079
2080 for (i = 0; i < dependencies_used; i++)
2081 if (dependency_list[i] == needed_pst)
2082 {
2083 found = 1;
2084 break;
2085 }
2086
2087 /* If it's already in the list, skip the rest. */
2088 if (found)
2089 continue;
2090
2091 dependency_list[dependencies_used++] = needed_pst;
2092 if (dependencies_used >= dependencies_allocated)
2093 {
2094 struct partial_symtab **orig = dependency_list;
2095
2096 dependency_list =
2097 (struct partial_symtab **)
2098 alloca ((dependencies_allocated *= 2)
2099 * sizeof (struct partial_symtab *));
2100 memcpy (dependency_list, orig,
2101 (dependencies_used
2102 * sizeof (struct partial_symtab *)));
2103 #ifdef DEBUG_INFO
2104 fprintf_unfiltered (gdb_stderr,
2105 "Had to reallocate "
2106 "dependency list.\n");
2107 fprintf_unfiltered (gdb_stderr,
2108 "New dependencies allocated: %d\n",
2109 dependencies_allocated);
2110 #endif
2111 }
2112 }
2113 }
2114 continue;
2115
2116 case N_ENDM:
2117 /* Solaris 2 end of module, finish current partial symbol table.
2118 end_psymtab will set pst->texthigh to the proper value, which
2119 is necessary if a module compiled without debugging info
2120 follows this module. */
2121 if (pst && gdbarch_sofun_address_maybe_missing (gdbarch))
2122 {
2123 end_psymtab (objfile, pst, psymtab_include_list, includes_used,
2124 symnum * symbol_size,
2125 (CORE_ADDR) 0, dependency_list,
2126 dependencies_used, textlow_not_set);
2127 pst = (struct partial_symtab *) 0;
2128 includes_used = 0;
2129 dependencies_used = 0;
2130 has_line_numbers = 0;
2131 }
2132 continue;
2133
2134 case N_RBRAC:
2135 #ifdef HANDLE_RBRAC
2136 HANDLE_RBRAC (nlist.n_value);
2137 continue;
2138 #endif
2139 case N_EINCL:
2140 case N_DSLINE:
2141 case N_BSLINE:
2142 case N_SSYM: /* Claim: Structure or union element.
2143 Hopefully, I can ignore this. */
2144 case N_ENTRY: /* Alternate entry point; can ignore. */
2145 case N_MAIN: /* Can definitely ignore this. */
2146 case N_CATCH: /* These are GNU C++ extensions */
2147 case N_EHDECL: /* that can safely be ignored here. */
2148 case N_LENG:
2149 case N_BCOMM:
2150 case N_ECOMM:
2151 case N_ECOML:
2152 case N_FNAME:
2153 case N_SLINE:
2154 case N_RSYM:
2155 case N_PSYM:
2156 case N_LBRAC:
2157 case N_NSYMS: /* Ultrix 4.0: symbol count */
2158 case N_DEFD: /* GNU Modula-2 */
2159 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */
2160
2161 case N_OBJ: /* Useless types from Solaris. */
2162 case N_OPT:
2163 case N_PATCH:
2164 /* These symbols aren't interesting; don't worry about them. */
2165 continue;
2166
2167 default:
2168 /* If we haven't found it yet, ignore it. It's probably some
2169 new type we don't know about yet. */
2170 unknown_symtype_complaint (hex_string (nlist.n_type));
2171 continue;
2172 }
2173 }
2174
2175 /* If there's stuff to be cleaned up, clean it up. */
2176 if (pst)
2177 {
2178 /* Don't set pst->texthigh lower than it already is. */
2179 CORE_ADDR text_end =
2180 (lowest_text_address == (CORE_ADDR) -1
2181 ? (text_addr + ANOFFSET (objfile->section_offsets,
2182 SECT_OFF_TEXT (objfile)))
2183 : lowest_text_address)
2184 + text_size;
2185
2186 end_psymtab (objfile, pst, psymtab_include_list, includes_used,
2187 symnum * symbol_size,
2188 text_end > pst->texthigh ? text_end : pst->texthigh,
2189 dependency_list, dependencies_used, textlow_not_set);
2190 }
2191
2192 do_cleanups (back_to);
2193 }
2194
2195 /* Allocate and partially fill a partial symtab. It will be
2196 completely filled at the end of the symbol list.
2197
2198 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
2199 is the address relative to which its symbols are (incremental) or 0
2200 (normal). */
2201
2202 static struct partial_symtab *
start_psymtab(struct objfile * objfile,char * filename,CORE_ADDR textlow,int ldsymoff,struct partial_symbol ** global_syms,struct partial_symbol ** static_syms)2203 start_psymtab (struct objfile *objfile, char *filename, CORE_ADDR textlow,
2204 int ldsymoff, struct partial_symbol **global_syms,
2205 struct partial_symbol **static_syms)
2206 {
2207 struct partial_symtab *result =
2208 start_psymtab_common (objfile, objfile->section_offsets,
2209 filename, textlow, global_syms, static_syms);
2210
2211 result->read_symtab_private = obstack_alloc (&objfile->objfile_obstack,
2212 sizeof (struct symloc));
2213 LDSYMOFF (result) = ldsymoff;
2214 result->read_symtab = dbx_read_symtab;
2215 SYMBOL_SIZE (result) = symbol_size;
2216 SYMBOL_OFFSET (result) = symbol_table_offset;
2217 STRING_OFFSET (result) = string_table_offset;
2218 FILE_STRING_OFFSET (result) = file_string_table_offset;
2219
2220 #ifdef HAVE_ELF
2221 /* If we're handling an ELF file, drag some section-relocation info
2222 for this source file out of the ELF symbol table, to compensate for
2223 Sun brain death. This replaces the section_offsets in this psymtab,
2224 if successful. */
2225 elfstab_offset_sections (objfile, result);
2226 #endif
2227
2228 /* Deduce the source language from the filename for this psymtab. */
2229 psymtab_language = deduce_language_from_filename (filename);
2230
2231 return result;
2232 }
2233
2234 /* Close off the current usage of PST.
2235 Returns PST or NULL if the partial symtab was empty and thrown away.
2236
2237 FIXME: List variables and peculiarities of same. */
2238
2239 struct partial_symtab *
end_psymtab(struct objfile * objfile,struct partial_symtab * pst,const char ** include_list,int num_includes,int capping_symbol_offset,CORE_ADDR capping_text,struct partial_symtab ** dependency_list,int number_dependencies,int textlow_not_set)2240 end_psymtab (struct objfile *objfile, struct partial_symtab *pst,
2241 const char **include_list, int num_includes,
2242 int capping_symbol_offset, CORE_ADDR capping_text,
2243 struct partial_symtab **dependency_list, int number_dependencies,
2244 int textlow_not_set)
2245 {
2246 int i;
2247 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2248
2249 if (capping_symbol_offset != -1)
2250 LDSYMLEN (pst) = capping_symbol_offset - LDSYMOFF (pst);
2251 pst->texthigh = capping_text;
2252
2253 /* Under Solaris, the N_SO symbols always have a value of 0,
2254 instead of the usual address of the .o file. Therefore,
2255 we have to do some tricks to fill in texthigh and textlow.
2256 The first trick is: if we see a static
2257 or global function, and the textlow for the current pst
2258 is not set (ie: textlow_not_set), then we use that function's
2259 address for the textlow of the pst. */
2260
2261 /* Now, to fill in texthigh, we remember the last function seen
2262 in the .o file. Also, there's a hack in
2263 bfd/elf.c and gdb/elfread.c to pass the ELF st_size field
2264 to here via the misc_info field. Therefore, we can fill in
2265 a reliable texthigh by taking the address plus size of the
2266 last function in the file. */
2267
2268 if (pst->texthigh == 0 && last_function_name
2269 && gdbarch_sofun_address_maybe_missing (gdbarch))
2270 {
2271 char *p;
2272 int n;
2273 struct minimal_symbol *minsym;
2274
2275 p = strchr (last_function_name, ':');
2276 if (p == NULL)
2277 p = last_function_name;
2278 n = p - last_function_name;
2279 p = alloca (n + 2);
2280 strncpy (p, last_function_name, n);
2281 p[n] = 0;
2282
2283 minsym = lookup_minimal_symbol (p, pst->filename, objfile);
2284 if (minsym == NULL)
2285 {
2286 /* Sun Fortran appends an underscore to the minimal symbol name,
2287 try again with an appended underscore if the minimal symbol
2288 was not found. */
2289 p[n] = '_';
2290 p[n + 1] = 0;
2291 minsym = lookup_minimal_symbol (p, pst->filename, objfile);
2292 }
2293
2294 if (minsym)
2295 pst->texthigh = SYMBOL_VALUE_ADDRESS (minsym) + MSYMBOL_SIZE (minsym);
2296
2297 last_function_name = NULL;
2298 }
2299
2300 if (!gdbarch_sofun_address_maybe_missing (gdbarch))
2301 ;
2302 /* This test will be true if the last .o file is only data. */
2303 else if (textlow_not_set)
2304 pst->textlow = pst->texthigh;
2305 else
2306 {
2307 struct partial_symtab *p1;
2308
2309 /* If we know our own starting text address, then walk through all other
2310 psymtabs for this objfile, and if any didn't know their ending text
2311 address, set it to our starting address. Take care to not set our
2312 own ending address to our starting address, nor to set addresses on
2313 `dependency' files that have both textlow and texthigh zero. */
2314
2315 ALL_OBJFILE_PSYMTABS (objfile, p1)
2316 {
2317 if (p1->texthigh == 0 && p1->textlow != 0 && p1 != pst)
2318 {
2319 p1->texthigh = pst->textlow;
2320 /* If this file has only data, then make textlow match
2321 texthigh. */
2322 if (p1->textlow == 0)
2323 p1->textlow = p1->texthigh;
2324 }
2325 }
2326 }
2327
2328 /* End of kludge for patching Solaris textlow and texthigh. */
2329
2330 pst->n_global_syms =
2331 objfile->global_psymbols.next - (objfile->global_psymbols.list
2332 + pst->globals_offset);
2333 pst->n_static_syms =
2334 objfile->static_psymbols.next - (objfile->static_psymbols.list
2335 + pst->statics_offset);
2336
2337 pst->number_of_dependencies = number_dependencies;
2338 if (number_dependencies)
2339 {
2340 pst->dependencies = (struct partial_symtab **)
2341 obstack_alloc (&objfile->objfile_obstack,
2342 number_dependencies * sizeof (struct partial_symtab *));
2343 memcpy (pst->dependencies, dependency_list,
2344 number_dependencies * sizeof (struct partial_symtab *));
2345 }
2346 else
2347 pst->dependencies = 0;
2348
2349 for (i = 0; i < num_includes; i++)
2350 {
2351 struct partial_symtab *subpst =
2352 allocate_psymtab (include_list[i], objfile);
2353
2354 /* Copy the sesction_offsets array from the main psymtab. */
2355 subpst->section_offsets = pst->section_offsets;
2356 subpst->read_symtab_private =
2357 obstack_alloc (&objfile->objfile_obstack, sizeof (struct symloc));
2358 LDSYMOFF (subpst) =
2359 LDSYMLEN (subpst) =
2360 subpst->textlow =
2361 subpst->texthigh = 0;
2362
2363 /* We could save slight bits of space by only making one of these,
2364 shared by the entire set of include files. FIXME-someday. */
2365 subpst->dependencies = (struct partial_symtab **)
2366 obstack_alloc (&objfile->objfile_obstack,
2367 sizeof (struct partial_symtab *));
2368 subpst->dependencies[0] = pst;
2369 subpst->number_of_dependencies = 1;
2370
2371 subpst->globals_offset =
2372 subpst->n_global_syms =
2373 subpst->statics_offset =
2374 subpst->n_static_syms = 0;
2375
2376 subpst->readin = 0;
2377 subpst->symtab = 0;
2378 subpst->read_symtab = pst->read_symtab;
2379 }
2380
2381 sort_pst_symbols (objfile, pst);
2382
2383 if (num_includes == 0
2384 && number_dependencies == 0
2385 && pst->n_global_syms == 0
2386 && pst->n_static_syms == 0
2387 && has_line_numbers == 0)
2388 {
2389 /* Throw away this psymtab, it's empty. We can't deallocate it, since
2390 it is on the obstack, but we can forget to chain it on the list. */
2391 /* Empty psymtabs happen as a result of header files which don't have
2392 any symbols in them. There can be a lot of them. But this check
2393 is wrong, in that a psymtab with N_SLINE entries but nothing else
2394 is not empty, but we don't realize that. Fixing that without slowing
2395 things down might be tricky. */
2396
2397 discard_psymtab (objfile, pst);
2398
2399 /* Indicate that psymtab was thrown away. */
2400 pst = (struct partial_symtab *) NULL;
2401 }
2402 return pst;
2403 }
2404
2405 static void
dbx_psymtab_to_symtab_1(struct objfile * objfile,struct partial_symtab * pst)2406 dbx_psymtab_to_symtab_1 (struct objfile *objfile, struct partial_symtab *pst)
2407 {
2408 struct cleanup *old_chain;
2409 int i;
2410
2411 if (pst->readin)
2412 {
2413 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. "
2414 "Shouldn't happen.\n",
2415 pst->filename);
2416 return;
2417 }
2418
2419 /* Read in all partial symtabs on which this one is dependent. */
2420 for (i = 0; i < pst->number_of_dependencies; i++)
2421 if (!pst->dependencies[i]->readin)
2422 {
2423 /* Inform about additional files that need to be read in. */
2424 if (info_verbose)
2425 {
2426 fputs_filtered (" ", gdb_stdout);
2427 wrap_here ("");
2428 fputs_filtered ("and ", gdb_stdout);
2429 wrap_here ("");
2430 printf_filtered ("%s...", pst->dependencies[i]->filename);
2431 wrap_here (""); /* Flush output. */
2432 gdb_flush (gdb_stdout);
2433 }
2434 dbx_psymtab_to_symtab_1 (objfile, pst->dependencies[i]);
2435 }
2436
2437 if (LDSYMLEN (pst)) /* Otherwise it's a dummy. */
2438 {
2439 /* Init stuff necessary for reading in symbols */
2440 stabsread_init ();
2441 buildsym_init ();
2442 old_chain = make_cleanup (really_free_pendings, 0);
2443 file_string_table_offset = FILE_STRING_OFFSET (pst);
2444 symbol_size = SYMBOL_SIZE (pst);
2445
2446 /* Read in this file's symbols. */
2447 bfd_seek (objfile->obfd, SYMBOL_OFFSET (pst), SEEK_SET);
2448 read_ofile_symtab (objfile, pst);
2449
2450 do_cleanups (old_chain);
2451 }
2452
2453 pst->readin = 1;
2454 }
2455
2456 /* Read in all of the symbols for a given psymtab for real.
2457 Be verbose about it if the user wants that. SELF is not NULL. */
2458
2459 static void
dbx_read_symtab(struct partial_symtab * self,struct objfile * objfile)2460 dbx_read_symtab (struct partial_symtab *self, struct objfile *objfile)
2461 {
2462 bfd *sym_bfd;
2463 struct cleanup *back_to = NULL;
2464
2465 if (self->readin)
2466 {
2467 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. "
2468 "Shouldn't happen.\n",
2469 self->filename);
2470 return;
2471 }
2472
2473 if (LDSYMLEN (self) || self->number_of_dependencies)
2474 {
2475 /* Print the message now, before reading the string table,
2476 to avoid disconcerting pauses. */
2477 if (info_verbose)
2478 {
2479 printf_filtered ("Reading in symbols for %s...", self->filename);
2480 gdb_flush (gdb_stdout);
2481 }
2482
2483 sym_bfd = objfile->obfd;
2484
2485 next_symbol_text_func = dbx_next_symbol_text;
2486
2487 if (DBX_STAB_SECTION (objfile))
2488 {
2489 stabs_data
2490 = symfile_relocate_debug_section (objfile,
2491 DBX_STAB_SECTION (objfile),
2492 NULL);
2493
2494 if (stabs_data)
2495 back_to = make_cleanup (free_current_contents,
2496 (void *) &stabs_data);
2497 }
2498
2499 dbx_psymtab_to_symtab_1 (objfile, self);
2500
2501 if (back_to)
2502 do_cleanups (back_to);
2503
2504 /* Match with global symbols. This only needs to be done once,
2505 after all of the symtabs and dependencies have been read in. */
2506 scan_file_globals (objfile);
2507
2508 /* Finish up the debug error message. */
2509 if (info_verbose)
2510 printf_filtered ("done.\n");
2511 }
2512 }
2513
2514 /* Read in a defined section of a specific object file's symbols. */
2515
2516 static void
read_ofile_symtab(struct objfile * objfile,struct partial_symtab * pst)2517 read_ofile_symtab (struct objfile *objfile, struct partial_symtab *pst)
2518 {
2519 char *namestring;
2520 struct external_nlist *bufp;
2521 struct internal_nlist nlist;
2522 unsigned char type;
2523 unsigned max_symnum;
2524 bfd *abfd;
2525 int sym_offset; /* Offset to start of symbols to read */
2526 int sym_size; /* Size of symbols to read */
2527 CORE_ADDR text_offset; /* Start of text segment for symbols */
2528 int text_size; /* Size of text segment for symbols */
2529 struct section_offsets *section_offsets;
2530
2531 sym_offset = LDSYMOFF (pst);
2532 sym_size = LDSYMLEN (pst);
2533 text_offset = pst->textlow;
2534 text_size = pst->texthigh - pst->textlow;
2535 /* This cannot be simply objfile->section_offsets because of
2536 elfstab_offset_sections() which initializes the psymtab section
2537 offsets information in a special way, and that is different from
2538 objfile->section_offsets. */
2539 section_offsets = pst->section_offsets;
2540
2541 dbxread_objfile = objfile;
2542 subfile_stack = NULL;
2543
2544 stringtab_global = DBX_STRINGTAB (objfile);
2545 set_last_source_file (NULL);
2546
2547 abfd = objfile->obfd;
2548 symfile_bfd = objfile->obfd; /* Implicit param to next_text_symbol. */
2549 symbuf_end = symbuf_idx = 0;
2550 symbuf_read = 0;
2551 symbuf_left = sym_offset + sym_size;
2552
2553 /* It is necessary to actually read one symbol *before* the start
2554 of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL
2555 occurs before the N_SO symbol.
2556
2557 Detecting this in read_dbx_symtab
2558 would slow down initial readin, so we look for it here instead. */
2559 if (!processing_acc_compilation && sym_offset >= (int) symbol_size)
2560 {
2561 stabs_seek (sym_offset - symbol_size);
2562 fill_symbuf (abfd);
2563 bufp = &symbuf[symbuf_idx++];
2564 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
2565 OBJSTAT (objfile, n_stabs++);
2566
2567 namestring = set_namestring (objfile, &nlist);
2568
2569 processing_gcc_compilation = 0;
2570 if (nlist.n_type == N_TEXT)
2571 {
2572 const char *tempstring = namestring;
2573
2574 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0)
2575 processing_gcc_compilation = 1;
2576 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2577 processing_gcc_compilation = 2;
2578 if (tempstring[0] == bfd_get_symbol_leading_char (symfile_bfd))
2579 ++tempstring;
2580 if (strncmp (tempstring, "__gnu_compiled", 14) == 0)
2581 processing_gcc_compilation = 2;
2582 }
2583
2584 /* Try to select a C++ demangling based on the compilation unit
2585 producer. */
2586
2587 #if 0
2588 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't
2589 know whether it will use the old style or v3 mangling. */
2590 if (processing_gcc_compilation)
2591 {
2592 if (AUTO_DEMANGLING)
2593 {
2594 set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
2595 }
2596 }
2597 #endif
2598 }
2599 else
2600 {
2601 /* The N_SO starting this symtab is the first symbol, so we
2602 better not check the symbol before it. I'm not this can
2603 happen, but it doesn't hurt to check for it. */
2604 stabs_seek (sym_offset);
2605 processing_gcc_compilation = 0;
2606 }
2607
2608 if (symbuf_idx == symbuf_end)
2609 fill_symbuf (abfd);
2610 bufp = &symbuf[symbuf_idx];
2611 if (bfd_h_get_8 (abfd, bufp->e_type) != N_SO)
2612 error (_("First symbol in segment of executable not a source symbol"));
2613
2614 max_symnum = sym_size / symbol_size;
2615
2616 for (symnum = 0;
2617 symnum < max_symnum;
2618 symnum++)
2619 {
2620 QUIT; /* Allow this to be interruptable. */
2621 if (symbuf_idx == symbuf_end)
2622 fill_symbuf (abfd);
2623 bufp = &symbuf[symbuf_idx++];
2624 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
2625 OBJSTAT (objfile, n_stabs++);
2626
2627 type = bfd_h_get_8 (abfd, bufp->e_type);
2628
2629 namestring = set_namestring (objfile, &nlist);
2630
2631 if (type & N_STAB)
2632 {
2633 if (sizeof (nlist.n_value) > 4
2634 /* We are a 64-bit debugger debugging a 32-bit program. */
2635 && (type == N_LSYM || type == N_PSYM))
2636 /* We have to be careful with the n_value in the case of N_LSYM
2637 and N_PSYM entries, because they are signed offsets from frame
2638 pointer, but we actually read them as unsigned 32-bit values.
2639 This is not a problem for 32-bit debuggers, for which negative
2640 values end up being interpreted correctly (as negative
2641 offsets) due to integer overflow.
2642 But we need to sign-extend the value for 64-bit debuggers,
2643 or we'll end up interpreting negative values as very large
2644 positive offsets. */
2645 nlist.n_value = (nlist.n_value ^ 0x80000000) - 0x80000000;
2646 process_one_symbol (type, nlist.n_desc, nlist.n_value,
2647 namestring, section_offsets, objfile);
2648 }
2649 /* We skip checking for a new .o or -l file; that should never
2650 happen in this routine. */
2651 else if (type == N_TEXT)
2652 {
2653 /* I don't think this code will ever be executed, because
2654 the GCC_COMPILED_FLAG_SYMBOL usually is right before
2655 the N_SO symbol which starts this source file.
2656 However, there is no reason not to accept
2657 the GCC_COMPILED_FLAG_SYMBOL anywhere. */
2658
2659 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0)
2660 processing_gcc_compilation = 1;
2661 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2662 processing_gcc_compilation = 2;
2663
2664 #if 0
2665 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't
2666 know whether it will use the old style or v3 mangling. */
2667 if (AUTO_DEMANGLING)
2668 {
2669 set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
2670 }
2671 #endif
2672 }
2673 else if (type & N_EXT || type == (unsigned char) N_TEXT
2674 || type == (unsigned char) N_NBTEXT)
2675 {
2676 /* Global symbol: see if we came across a dbx defintion for
2677 a corresponding symbol. If so, store the value. Remove
2678 syms from the chain when their values are stored, but
2679 search the whole chain, as there may be several syms from
2680 different files with the same name. */
2681 /* This is probably not true. Since the files will be read
2682 in one at a time, each reference to a global symbol will
2683 be satisfied in each file as it appears. So we skip this
2684 section. */
2685 ;
2686 }
2687 }
2688
2689 /* In a Solaris elf file, this variable, which comes from the
2690 value of the N_SO symbol, will still be 0. Luckily, text_offset,
2691 which comes from pst->textlow is correct. */
2692 if (last_source_start_addr == 0)
2693 last_source_start_addr = text_offset;
2694
2695 /* In reordered executables last_source_start_addr may not be the
2696 lower bound for this symtab, instead use text_offset which comes
2697 from pst->textlow which is correct. */
2698 if (last_source_start_addr > text_offset)
2699 last_source_start_addr = text_offset;
2700
2701 pst->symtab = end_symtab (text_offset + text_size, objfile,
2702 SECT_OFF_TEXT (objfile));
2703
2704 end_stabs ();
2705
2706 dbxread_objfile = NULL;
2707 }
2708
2709
2710 /* Record the namespace that the function defined by SYMBOL was
2711 defined in, if necessary. BLOCK is the associated block; use
2712 OBSTACK for allocation. */
2713
2714 static void
cp_set_block_scope(const struct symbol * symbol,struct block * block,struct obstack * obstack)2715 cp_set_block_scope (const struct symbol *symbol,
2716 struct block *block,
2717 struct obstack *obstack)
2718 {
2719 if (SYMBOL_DEMANGLED_NAME (symbol) != NULL)
2720 {
2721 /* Try to figure out the appropriate namespace from the
2722 demangled name. */
2723
2724 /* FIXME: carlton/2003-04-15: If the function in question is
2725 a method of a class, the name will actually include the
2726 name of the class as well. This should be harmless, but
2727 is a little unfortunate. */
2728
2729 const char *name = SYMBOL_DEMANGLED_NAME (symbol);
2730 unsigned int prefix_len = cp_entire_prefix_len (name);
2731
2732 block_set_scope (block,
2733 obstack_copy0 (obstack, name, prefix_len),
2734 obstack);
2735 }
2736 }
2737
2738 /* This handles a single symbol from the symbol-file, building symbols
2739 into a GDB symtab. It takes these arguments and an implicit argument.
2740
2741 TYPE is the type field of the ".stab" symbol entry.
2742 DESC is the desc field of the ".stab" entry.
2743 VALU is the value field of the ".stab" entry.
2744 NAME is the symbol name, in our address space.
2745 SECTION_OFFSETS is a set of amounts by which the sections of this
2746 object file were relocated when it was loaded into memory. Note
2747 that these section_offsets are not the objfile->section_offsets but
2748 the pst->section_offsets. All symbols that refer to memory
2749 locations need to be offset by these amounts.
2750 OBJFILE is the object file from which we are reading symbols. It
2751 is used in end_symtab. */
2752
2753 void
process_one_symbol(int type,int desc,CORE_ADDR valu,char * name,struct section_offsets * section_offsets,struct objfile * objfile)2754 process_one_symbol (int type, int desc, CORE_ADDR valu, char *name,
2755 struct section_offsets *section_offsets,
2756 struct objfile *objfile)
2757 {
2758 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2759 struct context_stack *new;
2760 /* This remembers the address of the start of a function. It is
2761 used because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries
2762 are relative to the current function's start address. On systems
2763 other than Solaris 2, this just holds the SECT_OFF_TEXT value,
2764 and is used to relocate these symbol types rather than
2765 SECTION_OFFSETS. */
2766 static CORE_ADDR function_start_offset;
2767
2768 /* This holds the address of the start of a function, without the
2769 system peculiarities of function_start_offset. */
2770 static CORE_ADDR last_function_start;
2771
2772 /* If this is nonzero, we've seen an N_SLINE since the start of the
2773 current function. We use this to tell us to move the first sline
2774 to the beginning of the function regardless of what its given
2775 value is. */
2776 static int sline_found_in_function = 1;
2777
2778 /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this
2779 source file. Used to detect the SunPRO solaris compiler. */
2780 static int n_opt_found;
2781
2782 /* The stab type used for the definition of the last function.
2783 N_STSYM or N_GSYM for SunOS4 acc; N_FUN for other compilers. */
2784 static int function_stab_type = 0;
2785
2786 if (!block_address_function_relative)
2787 {
2788 /* N_LBRAC, N_RBRAC and N_SLINE entries are not relative to the
2789 function start address, so just use the text offset. */
2790 function_start_offset =
2791 ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2792 }
2793
2794 /* Something is wrong if we see real data before seeing a source
2795 file name. */
2796
2797 if (get_last_source_file () == NULL && type != (unsigned char) N_SO)
2798 {
2799 /* Ignore any symbols which appear before an N_SO symbol.
2800 Currently no one puts symbols there, but we should deal
2801 gracefully with the case. A complain()t might be in order,
2802 but this should not be an error (). */
2803 return;
2804 }
2805
2806 switch (type)
2807 {
2808 case N_FUN:
2809 case N_FNAME:
2810
2811 if (*name == '\000')
2812 {
2813 /* This N_FUN marks the end of a function. This closes off
2814 the current block. */
2815 struct block *block;
2816
2817 if (context_stack_depth <= 0)
2818 {
2819 lbrac_mismatch_complaint (symnum);
2820 break;
2821 }
2822
2823 /* The following check is added before recording line 0 at
2824 end of function so as to handle hand-generated stabs
2825 which may have an N_FUN stabs at the end of the function,
2826 but no N_SLINE stabs. */
2827 if (sline_found_in_function)
2828 {
2829 CORE_ADDR addr = last_function_start + valu;
2830
2831 record_line (current_subfile, 0,
2832 gdbarch_addr_bits_remove (gdbarch, addr));
2833 }
2834
2835 within_function = 0;
2836 new = pop_context ();
2837
2838 /* Make a block for the local symbols within. */
2839 block = finish_block (new->name, &local_symbols, new->old_blocks,
2840 new->start_addr, new->start_addr + valu,
2841 objfile);
2842
2843 /* For C++, set the block's scope. */
2844 if (SYMBOL_LANGUAGE (new->name) == language_cplus)
2845 cp_set_block_scope (new->name, block, &objfile->objfile_obstack);
2846
2847 /* May be switching to an assembler file which may not be using
2848 block relative stabs, so reset the offset. */
2849 if (block_address_function_relative)
2850 function_start_offset = 0;
2851
2852 break;
2853 }
2854
2855 sline_found_in_function = 0;
2856
2857 /* Relocate for dynamic loading. */
2858 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2859 valu = gdbarch_addr_bits_remove (gdbarch, valu);
2860 last_function_start = valu;
2861
2862 goto define_a_symbol;
2863
2864 case N_LBRAC:
2865 /* This "symbol" just indicates the start of an inner lexical
2866 context within a function. */
2867
2868 /* Ignore extra outermost context from SunPRO cc and acc. */
2869 if (n_opt_found && desc == 1)
2870 break;
2871
2872 if (block_address_function_relative)
2873 /* Relocate for Sun ELF acc fn-relative syms. */
2874 valu += function_start_offset;
2875 else
2876 /* On most machines, the block addresses are relative to the
2877 N_SO, the linker did not relocate them (sigh). */
2878 valu += last_source_start_addr;
2879
2880 push_context (desc, valu);
2881 break;
2882
2883 case N_RBRAC:
2884 /* This "symbol" just indicates the end of an inner lexical
2885 context that was started with N_LBRAC. */
2886
2887 /* Ignore extra outermost context from SunPRO cc and acc. */
2888 if (n_opt_found && desc == 1)
2889 break;
2890
2891 if (block_address_function_relative)
2892 /* Relocate for Sun ELF acc fn-relative syms. */
2893 valu += function_start_offset;
2894 else
2895 /* On most machines, the block addresses are relative to the
2896 N_SO, the linker did not relocate them (sigh). */
2897 valu += last_source_start_addr;
2898
2899 if (context_stack_depth <= 0)
2900 {
2901 lbrac_mismatch_complaint (symnum);
2902 break;
2903 }
2904
2905 new = pop_context ();
2906 if (desc != new->depth)
2907 lbrac_mismatch_complaint (symnum);
2908
2909 if (local_symbols != NULL)
2910 {
2911 /* GCC development snapshots from March to December of
2912 2000 would output N_LSYM entries after N_LBRAC
2913 entries. As a consequence, these symbols are simply
2914 discarded. Complain if this is the case. */
2915 complaint (&symfile_complaints,
2916 _("misplaced N_LBRAC entry; discarding local "
2917 "symbols which have no enclosing block"));
2918 }
2919 local_symbols = new->locals;
2920
2921 if (context_stack_depth > 1)
2922 {
2923 /* This is not the outermost LBRAC...RBRAC pair in the
2924 function, its local symbols preceded it, and are the ones
2925 just recovered from the context stack. Define the block
2926 for them (but don't bother if the block contains no
2927 symbols. Should we complain on blocks without symbols?
2928 I can't think of any useful purpose for them). */
2929 if (local_symbols != NULL)
2930 {
2931 /* Muzzle a compiler bug that makes end < start.
2932
2933 ??? Which compilers? Is this ever harmful?. */
2934 if (new->start_addr > valu)
2935 {
2936 complaint (&symfile_complaints,
2937 _("block start larger than block end"));
2938 new->start_addr = valu;
2939 }
2940 /* Make a block for the local symbols within. */
2941 finish_block (0, &local_symbols, new->old_blocks,
2942 new->start_addr, valu, objfile);
2943 }
2944 }
2945 else
2946 {
2947 /* This is the outermost LBRAC...RBRAC pair. There is no
2948 need to do anything; leave the symbols that preceded it
2949 to be attached to the function's own block. We need to
2950 indicate that we just moved outside of the function. */
2951 within_function = 0;
2952 }
2953
2954 break;
2955
2956 case N_FN:
2957 case N_FN_SEQ:
2958 /* This kind of symbol indicates the start of an object file.
2959 Relocate for dynamic loading. */
2960 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2961 break;
2962
2963 case N_SO:
2964 /* This type of symbol indicates the start of data for one
2965 source file. Finish the symbol table of the previous source
2966 file (if any) and start accumulating a new symbol table.
2967 Relocate for dynamic loading. */
2968 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2969
2970 n_opt_found = 0;
2971
2972 if (get_last_source_file ())
2973 {
2974 /* Check if previous symbol was also an N_SO (with some
2975 sanity checks). If so, that one was actually the
2976 directory name, and the current one is the real file
2977 name. Patch things up. */
2978 if (previous_stab_code == (unsigned char) N_SO)
2979 {
2980 patch_subfile_names (current_subfile, name);
2981 break; /* Ignore repeated SOs. */
2982 }
2983 end_symtab (valu, objfile, SECT_OFF_TEXT (objfile));
2984 end_stabs ();
2985 }
2986
2987 /* Null name means this just marks the end of text for this .o
2988 file. Don't start a new symtab in this case. */
2989 if (*name == '\000')
2990 break;
2991
2992 if (block_address_function_relative)
2993 function_start_offset = 0;
2994
2995 start_stabs ();
2996 start_symtab (name, NULL, valu);
2997 record_debugformat ("stabs");
2998 break;
2999
3000 case N_SOL:
3001 /* This type of symbol indicates the start of data for a
3002 sub-source-file, one whose contents were copied or included
3003 in the compilation of the main source file (whose name was
3004 given in the N_SO symbol). Relocate for dynamic loading. */
3005 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
3006 start_subfile (name, current_subfile->dirname);
3007 break;
3008
3009 case N_BINCL:
3010 push_subfile ();
3011 add_new_header_file (name, valu);
3012 start_subfile (name, current_subfile->dirname);
3013 break;
3014
3015 case N_EINCL:
3016 start_subfile (pop_subfile (), current_subfile->dirname);
3017 break;
3018
3019 case N_EXCL:
3020 add_old_header_file (name, valu);
3021 break;
3022
3023 case N_SLINE:
3024 /* This type of "symbol" really just records one line-number --
3025 core-address correspondence. Enter it in the line list for
3026 this symbol table. */
3027
3028 /* Relocate for dynamic loading and for ELF acc
3029 function-relative symbols. */
3030 valu += function_start_offset;
3031
3032 /* GCC 2.95.3 emits the first N_SLINE stab somwehere in the
3033 middle of the prologue instead of right at the start of the
3034 function. To deal with this we record the address for the
3035 first N_SLINE stab to be the start of the function instead of
3036 the listed location. We really shouldn't to this. When
3037 compiling with optimization, this first N_SLINE stab might be
3038 optimized away. Other (non-GCC) compilers don't emit this
3039 stab at all. There is no real harm in having an extra
3040 numbered line, although it can be a bit annoying for the
3041 user. However, it totally screws up our testsuite.
3042
3043 So for now, keep adjusting the address of the first N_SLINE
3044 stab, but only for code compiled with GCC. */
3045
3046 if (within_function && sline_found_in_function == 0)
3047 {
3048 CORE_ADDR addr = processing_gcc_compilation == 2 ?
3049 last_function_start : valu;
3050
3051 record_line (current_subfile, desc,
3052 gdbarch_addr_bits_remove (gdbarch, addr));
3053 sline_found_in_function = 1;
3054 }
3055 else
3056 record_line (current_subfile, desc,
3057 gdbarch_addr_bits_remove (gdbarch, valu));
3058 break;
3059
3060 case N_BCOMM:
3061 common_block_start (name, objfile);
3062 break;
3063
3064 case N_ECOMM:
3065 common_block_end (objfile);
3066 break;
3067
3068 /* The following symbol types need to have the appropriate
3069 offset added to their value; then we process symbol
3070 definitions in the name. */
3071
3072 case N_STSYM: /* Static symbol in data segment. */
3073 case N_LCSYM: /* Static symbol in BSS segment. */
3074 case N_ROSYM: /* Static symbol in read-only data segment. */
3075 /* HORRID HACK DEPT. However, it's Sun's furgin' fault.
3076 Solaris 2's stabs-in-elf makes *most* symbols relative but
3077 leaves a few absolute (at least for Solaris 2.1 and version
3078 2.0.1 of the SunPRO compiler). N_STSYM and friends sit on
3079 the fence. .stab "foo:S...",N_STSYM is absolute (ld
3080 relocates it) .stab "foo:V...",N_STSYM is relative (section
3081 base subtracted). This leaves us no choice but to search for
3082 the 'S' or 'V'... (or pass the whole section_offsets stuff
3083 down ONE MORE function call level, which we really don't want
3084 to do). */
3085 {
3086 char *p;
3087
3088 /* Normal object file and NLMs have non-zero text seg offsets,
3089 but don't need their static syms offset in this fashion.
3090 XXX - This is really a crock that should be fixed in the
3091 solib handling code so that I don't have to work around it
3092 here. */
3093
3094 if (!symfile_relocatable)
3095 {
3096 p = strchr (name, ':');
3097 if (p != 0 && p[1] == 'S')
3098 {
3099 /* The linker relocated it. We don't want to add an
3100 elfstab_offset_sections-type offset, but we *do*
3101 want to add whatever solib.c passed to
3102 symbol_file_add as addr (this is known to affect
3103 SunOS 4, and I suspect ELF too). Since
3104 elfstab_offset_sections currently does not muck
3105 with the text offset (there is no Ttext.text
3106 symbol), we can get addr from the text offset. If
3107 elfstab_offset_sections ever starts dealing with
3108 the text offset, and we still need to do this, we
3109 need to invent a SECT_OFF_ADDR_KLUDGE or something. */
3110 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
3111 goto define_a_symbol;
3112 }
3113 }
3114 /* Since it's not the kludge case, re-dispatch to the right
3115 handler. */
3116 switch (type)
3117 {
3118 case N_STSYM:
3119 goto case_N_STSYM;
3120 case N_LCSYM:
3121 goto case_N_LCSYM;
3122 case N_ROSYM:
3123 goto case_N_ROSYM;
3124 default:
3125 internal_error (__FILE__, __LINE__,
3126 _("failed internal consistency check"));
3127 }
3128 }
3129
3130 case_N_STSYM: /* Static symbol in data segment. */
3131 case N_DSLINE: /* Source line number, data segment. */
3132 valu += ANOFFSET (section_offsets, SECT_OFF_DATA (objfile));
3133 goto define_a_symbol;
3134
3135 case_N_LCSYM: /* Static symbol in BSS segment. */
3136 case N_BSLINE: /* Source line number, BSS segment. */
3137 /* N_BROWS: overlaps with N_BSLINE. */
3138 valu += ANOFFSET (section_offsets, SECT_OFF_BSS (objfile));
3139 goto define_a_symbol;
3140
3141 case_N_ROSYM: /* Static symbol in read-only data segment. */
3142 valu += ANOFFSET (section_offsets, SECT_OFF_RODATA (objfile));
3143 goto define_a_symbol;
3144
3145 case N_ENTRY: /* Alternate entry point. */
3146 /* Relocate for dynamic loading. */
3147 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
3148 goto define_a_symbol;
3149
3150 /* The following symbol types we don't know how to process.
3151 Handle them in a "default" way, but complain to people who
3152 care. */
3153 default:
3154 case N_CATCH: /* Exception handler catcher. */
3155 case N_EHDECL: /* Exception handler name. */
3156 case N_PC: /* Global symbol in Pascal. */
3157 case N_M2C: /* Modula-2 compilation unit. */
3158 /* N_MOD2: overlaps with N_EHDECL. */
3159 case N_SCOPE: /* Modula-2 scope information. */
3160 case N_ECOML: /* End common (local name). */
3161 case N_NBTEXT: /* Gould Non-Base-Register symbols??? */
3162 case N_NBDATA:
3163 case N_NBBSS:
3164 case N_NBSTS:
3165 case N_NBLCS:
3166 unknown_symtype_complaint (hex_string (type));
3167 /* FALLTHROUGH */
3168
3169 /* The following symbol types don't need the address field
3170 relocated, since it is either unused, or is absolute. */
3171 define_a_symbol:
3172 case N_GSYM: /* Global variable. */
3173 case N_NSYMS: /* Number of symbols (Ultrix). */
3174 case N_NOMAP: /* No map? (Ultrix). */
3175 case N_RSYM: /* Register variable. */
3176 case N_DEFD: /* Modula-2 GNU module dependency. */
3177 case N_SSYM: /* Struct or union element. */
3178 case N_LSYM: /* Local symbol in stack. */
3179 case N_PSYM: /* Parameter variable. */
3180 case N_LENG: /* Length of preceding symbol type. */
3181 if (name)
3182 {
3183 int deftype;
3184 char *colon_pos = strchr (name, ':');
3185
3186 if (colon_pos == NULL)
3187 deftype = '\0';
3188 else
3189 deftype = colon_pos[1];
3190
3191 switch (deftype)
3192 {
3193 case 'f':
3194 case 'F':
3195 function_stab_type = type;
3196
3197 /* Deal with the SunPRO 3.0 compiler which omits the
3198 address from N_FUN symbols. */
3199 if (type == N_FUN
3200 && valu == ANOFFSET (section_offsets,
3201 SECT_OFF_TEXT (objfile))
3202 && gdbarch_sofun_address_maybe_missing (gdbarch))
3203 {
3204 CORE_ADDR minsym_valu =
3205 find_stab_function_addr (name, get_last_source_file (),
3206 objfile);
3207
3208 /* The function find_stab_function_addr will return
3209 0 if the minimal symbol wasn't found.
3210 (Unfortunately, this might also be a valid
3211 address.) Anyway, if it *does* return 0, it is
3212 likely that the value was set correctly to begin
3213 with... */
3214 if (minsym_valu != 0)
3215 valu = minsym_valu;
3216 }
3217
3218 if (block_address_function_relative)
3219 /* For Solaris 2 compilers, the block addresses and
3220 N_SLINE's are relative to the start of the
3221 function. On normal systems, and when using GCC on
3222 Solaris 2, these addresses are just absolute, or
3223 relative to the N_SO, depending on
3224 BLOCK_ADDRESS_ABSOLUTE. */
3225 function_start_offset = valu;
3226
3227 within_function = 1;
3228
3229 if (context_stack_depth > 1)
3230 {
3231 complaint (&symfile_complaints,
3232 _("unmatched N_LBRAC before symtab pos %d"),
3233 symnum);
3234 break;
3235 }
3236
3237 if (context_stack_depth > 0)
3238 {
3239 struct block *block;
3240
3241 new = pop_context ();
3242 /* Make a block for the local symbols within. */
3243 block = finish_block (new->name, &local_symbols,
3244 new->old_blocks, new->start_addr,
3245 valu, objfile);
3246
3247 /* For C++, set the block's scope. */
3248 if (SYMBOL_LANGUAGE (new->name) == language_cplus)
3249 cp_set_block_scope (new->name, block,
3250 &objfile->objfile_obstack);
3251 }
3252
3253 new = push_context (0, valu);
3254 new->name = define_symbol (valu, name, desc, type, objfile);
3255 break;
3256
3257 default:
3258 define_symbol (valu, name, desc, type, objfile);
3259 break;
3260 }
3261 }
3262 break;
3263
3264 /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it
3265 for a bunch of other flags, too. Someday we may parse their
3266 flags; for now we ignore theirs and hope they'll ignore ours. */
3267 case N_OPT: /* Solaris 2: Compiler options. */
3268 if (name)
3269 {
3270 if (strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0)
3271 {
3272 processing_gcc_compilation = 2;
3273 #if 0 /* Works, but is experimental. -fnf */
3274 /* For now, stay with AUTO_DEMANGLING for g++ output, as
3275 we don't know whether it will use the old style or v3
3276 mangling. */
3277 if (AUTO_DEMANGLING)
3278 {
3279 set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
3280 }
3281 #endif
3282 }
3283 else
3284 n_opt_found = 1;
3285 }
3286 break;
3287
3288 case N_MAIN: /* Name of main routine. */
3289 /* FIXME: If one has a symbol file with N_MAIN and then replaces
3290 it with a symbol file with "main" and without N_MAIN. I'm
3291 not sure exactly what rule to follow but probably something
3292 like: N_MAIN takes precedence over "main" no matter what
3293 objfile it is in; If there is more than one N_MAIN, choose
3294 the one in the symfile_objfile; If there is more than one
3295 N_MAIN within a given objfile, complain() and choose
3296 arbitrarily. (kingdon) */
3297 if (name != NULL)
3298 set_main_name (name);
3299 break;
3300
3301 /* The following symbol types can be ignored. */
3302 case N_OBJ: /* Solaris 2: Object file dir and name. */
3303 case N_PATCH: /* Solaris 2: Patch Run Time Checker. */
3304 /* N_UNDF: Solaris 2: File separator mark. */
3305 /* N_UNDF: -- we will never encounter it, since we only process
3306 one file's symbols at once. */
3307 case N_ENDM: /* Solaris 2: End of module. */
3308 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */
3309 break;
3310 }
3311
3312 /* '#' is a GNU C extension to allow one symbol to refer to another
3313 related symbol.
3314
3315 Generally this is used so that an alias can refer to its main
3316 symbol. */
3317 gdb_assert (name);
3318 if (name[0] == '#')
3319 {
3320 /* Initialize symbol reference names and determine if this is a
3321 definition. If a symbol reference is being defined, go ahead
3322 and add it. Otherwise, just return. */
3323
3324 char *s = name;
3325 int refnum;
3326
3327 /* If this stab defines a new reference ID that is not on the
3328 reference list, then put it on the reference list.
3329
3330 We go ahead and advance NAME past the reference, even though
3331 it is not strictly necessary at this time. */
3332 refnum = symbol_reference_defined (&s);
3333 if (refnum >= 0)
3334 if (!ref_search (refnum))
3335 ref_add (refnum, 0, name, valu);
3336 name = s;
3337 }
3338
3339 previous_stab_code = type;
3340 }
3341
3342 /* FIXME: The only difference between this and elfstab_build_psymtabs
3343 is the call to install_minimal_symbols for elf, and the support for
3344 split sections. If the differences are really that small, the code
3345 should be shared. */
3346
3347 /* Scan and build partial symbols for an coff symbol file.
3348 The coff file has already been processed to get its minimal symbols.
3349
3350 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
3351 rolled into one.
3352
3353 OBJFILE is the object file we are reading symbols from.
3354 ADDR is the address relative to which the symbols are (e.g.
3355 the base address of the text segment).
3356 TEXTADDR is the address of the text section.
3357 TEXTSIZE is the size of the text section.
3358 STABSECTS is the list of .stab sections in OBJFILE.
3359 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
3360 .stabstr section exists.
3361
3362 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
3363 adjusted for coff details. */
3364
3365 void
coffstab_build_psymtabs(struct objfile * objfile,CORE_ADDR textaddr,unsigned int textsize,struct stab_section_list * stabsects,file_ptr stabstroffset,unsigned int stabstrsize)3366 coffstab_build_psymtabs (struct objfile *objfile,
3367 CORE_ADDR textaddr, unsigned int textsize,
3368 struct stab_section_list *stabsects,
3369 file_ptr stabstroffset, unsigned int stabstrsize)
3370 {
3371 int val;
3372 bfd *sym_bfd = objfile->obfd;
3373 char *name = bfd_get_filename (sym_bfd);
3374 struct dbx_symfile_info *info;
3375 unsigned int stabsize;
3376
3377 /* There is already a dbx_symfile_info allocated by our caller.
3378 It might even contain some info from the coff symtab to help us. */
3379 info = DBX_SYMFILE_INFO (objfile);
3380
3381 DBX_TEXT_ADDR (objfile) = textaddr;
3382 DBX_TEXT_SIZE (objfile) = textsize;
3383
3384 #define COFF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */
3385 DBX_SYMBOL_SIZE (objfile) = COFF_STABS_SYMBOL_SIZE;
3386 DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
3387
3388 if (stabstrsize > bfd_get_size (sym_bfd))
3389 error (_("ridiculous string table size: %d bytes"), stabstrsize);
3390 DBX_STRINGTAB (objfile) = (char *)
3391 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1);
3392 OBJSTAT (objfile, sz_strtab += stabstrsize + 1);
3393
3394 /* Now read in the string table in one big gulp. */
3395
3396 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET);
3397 if (val < 0)
3398 perror_with_name (name);
3399 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd);
3400 if (val != stabstrsize)
3401 perror_with_name (name);
3402
3403 stabsread_new_init ();
3404 buildsym_new_init ();
3405 free_header_files ();
3406 init_header_files ();
3407
3408 processing_acc_compilation = 1;
3409
3410 /* In a coff file, we've already installed the minimal symbols that came
3411 from the coff (non-stab) symbol table, so always act like an
3412 incremental load here. */
3413 if (stabsects->next == NULL)
3414 {
3415 stabsize = bfd_section_size (sym_bfd, stabsects->section);
3416 DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile);
3417 DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos;
3418 }
3419 else
3420 {
3421 struct stab_section_list *stabsect;
3422
3423 DBX_SYMCOUNT (objfile) = 0;
3424 for (stabsect = stabsects; stabsect != NULL; stabsect = stabsect->next)
3425 {
3426 stabsize = bfd_section_size (sym_bfd, stabsect->section);
3427 DBX_SYMCOUNT (objfile) += stabsize / DBX_SYMBOL_SIZE (objfile);
3428 }
3429
3430 DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos;
3431
3432 symbuf_sections = stabsects->next;
3433 symbuf_left = bfd_section_size (sym_bfd, stabsects->section);
3434 symbuf_read = 0;
3435 }
3436
3437 dbx_symfile_read (objfile, 0);
3438 }
3439
3440 /* Scan and build partial symbols for an ELF symbol file.
3441 This ELF file has already been processed to get its minimal symbols.
3442
3443 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
3444 rolled into one.
3445
3446 OBJFILE is the object file we are reading symbols from.
3447 ADDR is the address relative to which the symbols are (e.g.
3448 the base address of the text segment).
3449 STABSECT is the BFD section information for the .stab section.
3450 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
3451 .stabstr section exists.
3452
3453 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
3454 adjusted for elf details. */
3455
3456 void
elfstab_build_psymtabs(struct objfile * objfile,asection * stabsect,file_ptr stabstroffset,unsigned int stabstrsize)3457 elfstab_build_psymtabs (struct objfile *objfile, asection *stabsect,
3458 file_ptr stabstroffset, unsigned int stabstrsize)
3459 {
3460 int val;
3461 bfd *sym_bfd = objfile->obfd;
3462 char *name = bfd_get_filename (sym_bfd);
3463 struct dbx_symfile_info *info;
3464 struct cleanup *back_to = make_cleanup (null_cleanup, NULL);
3465
3466 /* There is already a dbx_symfile_info allocated by our caller.
3467 It might even contain some info from the ELF symtab to help us. */
3468 info = DBX_SYMFILE_INFO (objfile);
3469
3470 /* Find the first and last text address. dbx_symfile_read seems to
3471 want this. */
3472 find_text_range (sym_bfd, objfile);
3473
3474 #define ELF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */
3475 DBX_SYMBOL_SIZE (objfile) = ELF_STABS_SYMBOL_SIZE;
3476 DBX_SYMCOUNT (objfile)
3477 = bfd_section_size (objfile->obfd, stabsect) / DBX_SYMBOL_SIZE (objfile);
3478 DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
3479 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos;
3480 DBX_STAB_SECTION (objfile) = stabsect;
3481
3482 if (stabstrsize > bfd_get_size (sym_bfd))
3483 error (_("ridiculous string table size: %d bytes"), stabstrsize);
3484 DBX_STRINGTAB (objfile) = (char *)
3485 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1);
3486 OBJSTAT (objfile, sz_strtab += stabstrsize + 1);
3487
3488 /* Now read in the string table in one big gulp. */
3489
3490 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET);
3491 if (val < 0)
3492 perror_with_name (name);
3493 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd);
3494 if (val != stabstrsize)
3495 perror_with_name (name);
3496
3497 stabsread_new_init ();
3498 buildsym_new_init ();
3499 free_header_files ();
3500 init_header_files ();
3501
3502 processing_acc_compilation = 1;
3503
3504 symbuf_read = 0;
3505 symbuf_left = bfd_section_size (objfile->obfd, stabsect);
3506 stabs_data = symfile_relocate_debug_section (objfile, stabsect, NULL);
3507 if (stabs_data)
3508 make_cleanup (free_current_contents, (void *) &stabs_data);
3509
3510 /* In an elf file, we've already installed the minimal symbols that came
3511 from the elf (non-stab) symbol table, so always act like an
3512 incremental load here. dbx_symfile_read should not generate any new
3513 minimal symbols, since we will have already read the ELF dynamic symbol
3514 table and normal symbol entries won't be in the ".stab" section; but in
3515 case it does, it will install them itself. */
3516 dbx_symfile_read (objfile, 0);
3517
3518 do_cleanups (back_to);
3519 }
3520
3521 /* Scan and build partial symbols for a file with special sections for stabs
3522 and stabstrings. The file has already been processed to get its minimal
3523 symbols, and any other symbols that might be necessary to resolve GSYMs.
3524
3525 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
3526 rolled into one.
3527
3528 OBJFILE is the object file we are reading symbols from.
3529 ADDR is the address relative to which the symbols are (e.g. the base address
3530 of the text segment).
3531 STAB_NAME is the name of the section that contains the stabs.
3532 STABSTR_NAME is the name of the section that contains the stab strings.
3533
3534 This routine is mostly copied from dbx_symfile_init and
3535 dbx_symfile_read. */
3536
3537 void
stabsect_build_psymtabs(struct objfile * objfile,char * stab_name,char * stabstr_name,char * text_name)3538 stabsect_build_psymtabs (struct objfile *objfile, char *stab_name,
3539 char *stabstr_name, char *text_name)
3540 {
3541 int val;
3542 bfd *sym_bfd = objfile->obfd;
3543 char *name = bfd_get_filename (sym_bfd);
3544 asection *stabsect;
3545 asection *stabstrsect;
3546 asection *text_sect;
3547 struct dbx_symfile_info *dbx;
3548
3549 stabsect = bfd_get_section_by_name (sym_bfd, stab_name);
3550 stabstrsect = bfd_get_section_by_name (sym_bfd, stabstr_name);
3551
3552 if (!stabsect)
3553 return;
3554
3555 if (!stabstrsect)
3556 error (_("stabsect_build_psymtabs: Found stabs (%s), "
3557 "but not string section (%s)"),
3558 stab_name, stabstr_name);
3559
3560 dbx = XCNEW (struct dbx_symfile_info);
3561 set_objfile_data (objfile, dbx_objfile_data_key, dbx);
3562
3563 text_sect = bfd_get_section_by_name (sym_bfd, text_name);
3564 if (!text_sect)
3565 error (_("Can't find %s section in symbol file"), text_name);
3566 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect);
3567 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect);
3568
3569 DBX_SYMBOL_SIZE (objfile) = sizeof (struct external_nlist);
3570 DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect)
3571 / DBX_SYMBOL_SIZE (objfile);
3572 DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stabstrsect);
3573 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; /* XXX - FIXME: POKING
3574 INSIDE BFD DATA
3575 STRUCTURES */
3576
3577 if (DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
3578 error (_("ridiculous string table size: %d bytes"),
3579 DBX_STRINGTAB_SIZE (objfile));
3580 DBX_STRINGTAB (objfile) = (char *)
3581 obstack_alloc (&objfile->objfile_obstack,
3582 DBX_STRINGTAB_SIZE (objfile) + 1);
3583 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile) + 1);
3584
3585 /* Now read in the string table in one big gulp. */
3586
3587 val = bfd_get_section_contents (sym_bfd, /* bfd */
3588 stabstrsect, /* bfd section */
3589 DBX_STRINGTAB (objfile), /* input buffer */
3590 0, /* offset into section */
3591 DBX_STRINGTAB_SIZE (objfile)); /* amount to
3592 read */
3593
3594 if (!val)
3595 perror_with_name (name);
3596
3597 stabsread_new_init ();
3598 buildsym_new_init ();
3599 free_header_files ();
3600 init_header_files ();
3601
3602 /* Now, do an incremental load. */
3603
3604 processing_acc_compilation = 1;
3605 dbx_symfile_read (objfile, 0);
3606 }
3607
3608 static const struct sym_fns aout_sym_fns =
3609 {
3610 bfd_target_aout_flavour,
3611 dbx_new_init, /* init anything gbl to entire symtab */
3612 dbx_symfile_init, /* read initial info, setup for sym_read() */
3613 dbx_symfile_read, /* read a symbol file into symtab */
3614 NULL, /* sym_read_psymbols */
3615 dbx_symfile_finish, /* finished with file, cleanup */
3616 default_symfile_offsets, /* parse user's offsets to internal form */
3617 default_symfile_segments, /* Get segment information from a file. */
3618 NULL,
3619 default_symfile_relocate, /* Relocate a debug section. */
3620 NULL, /* sym_probe_fns */
3621 &psym_functions
3622 };
3623
3624 void
_initialize_dbxread(void)3625 _initialize_dbxread (void)
3626 {
3627 add_symtab_fns (&aout_sym_fns);
3628
3629 dbx_objfile_data_key
3630 = register_objfile_data_with_cleanup (NULL, dbx_free_symfile_info);
3631 }
3632