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* partial-stab.h ('f', 'F'): Don't reference pst->textlow if pst
[thirdparty/binutils-gdb.git] / gdb / partial-stab.h
1 /* Shared code to pre-read a stab (dbx-style), when building a psymtab.
2 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992 Free Software Foundation,
3 Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20
21 /* The following need to be defined:
22 SET_NAMESTRING() --Set namestring to name of symbol.
23 CUR_SYMBOL_TYPE --Type code of current symbol.
24 CUR_SYMBOL_VALUE --Value field of current symbol. May be adjusted here.
25 */
26
27 /* End of macro definitions, now let's handle them symbols! */
28
29 switch (CUR_SYMBOL_TYPE)
30 {
31 char *p;
32 /*
33 * Standard, external, non-debugger, symbols
34 */
35
36 case N_TEXT | N_EXT:
37 case N_NBTEXT | N_EXT:
38 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
39 goto record_it;
40
41 case N_DATA | N_EXT:
42 case N_NBDATA | N_EXT:
43 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
44 goto record_it;
45
46 case N_BSS | N_EXT:
47 case N_NBBSS | N_EXT:
48 case N_SETV | N_EXT: /* FIXME, is this in BSS? */
49 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_BSS);
50 goto record_it;
51
52 case N_ABS | N_EXT:
53 record_it:
54 #ifdef DBXREAD_ONLY
55 SET_NAMESTRING();
56
57 bss_ext_symbol:
58 record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
59 CUR_SYMBOL_TYPE, objfile); /* Always */
60 #endif /* DBXREAD_ONLY */
61 continue;
62
63 /* Standard, local, non-debugger, symbols */
64
65 case N_NBTEXT:
66
67 /* We need to be able to deal with both N_FN or N_TEXT,
68 because we have no way of knowing whether the sys-supplied ld
69 or GNU ld was used to make the executable. Sequents throw
70 in another wrinkle -- they renumbered N_FN. */
71
72 case N_FN:
73 case N_FN_SEQ:
74 case N_TEXT:
75 #ifdef DBXREAD_ONLY
76 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
77 SET_NAMESTRING();
78 if ((namestring[0] == '-' && namestring[1] == 'l')
79 || (namestring [(nsl = strlen (namestring)) - 1] == 'o'
80 && namestring [nsl - 2] == '.')
81 #ifdef GDB_TARGET_IS_HPPA
82 /* some cooperation from gcc to get around ld stupidity */
83 || (namestring[0] == 'e' && !strcmp (namestring, "end_file."))
84 #endif
85 )
86 {
87 #ifndef GDB_TARGET_IS_HPPA
88 if (objfile -> ei.entry_point < CUR_SYMBOL_VALUE &&
89 objfile -> ei.entry_point >= last_o_file_start)
90 {
91 objfile -> ei.entry_file_lowpc = last_o_file_start;
92 objfile -> ei.entry_file_highpc = CUR_SYMBOL_VALUE;
93 }
94 #endif
95 if (past_first_source_file && pst
96 /* The gould NP1 uses low values for .o and -l symbols
97 which are not the address. */
98 && CUR_SYMBOL_VALUE >= pst->textlow)
99 {
100 END_PSYMTAB (pst, psymtab_include_list, includes_used,
101 symnum * symbol_size, CUR_SYMBOL_VALUE,
102 dependency_list, dependencies_used);
103 pst = (struct partial_symtab *) 0;
104 includes_used = 0;
105 dependencies_used = 0;
106 }
107 else
108 past_first_source_file = 1;
109 last_o_file_start = CUR_SYMBOL_VALUE;
110 }
111 #endif /* DBXREAD_ONLY */
112 continue;
113
114 case N_DATA:
115 #ifdef DBXREAD_ONLY
116 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
117 SET_NAMESTRING ();
118 /* Check for __DYNAMIC, which is used by Sun shared libraries.
119 Record it even if it's local, not global, so we can find it.
120 Same with virtual function tables, both global and static. */
121 if ((namestring[8] == 'C' && (strcmp ("__DYNAMIC", namestring) == 0))
122 || VTBL_PREFIX_P ((namestring+HASH_OFFSET)))
123 {
124 record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
125 CUR_SYMBOL_TYPE, objfile); /* Always */
126 }
127 #endif /* DBXREAD_ONLY */
128 continue;
129
130 case N_UNDF | N_EXT:
131 #ifdef DBXREAD_ONLY
132 if (CUR_SYMBOL_VALUE != 0) {
133 /* This is a "Fortran COMMON" symbol. See if the target
134 environment knows where it has been relocated to. */
135
136 CORE_ADDR reladdr;
137
138 SET_NAMESTRING();
139 if (target_lookup_symbol (namestring, &reladdr)) {
140 continue; /* Error in lookup; ignore symbol for now. */
141 }
142 CUR_SYMBOL_TYPE ^= (N_BSS^N_UNDF); /* Define it as a bss-symbol */
143 CUR_SYMBOL_VALUE = reladdr;
144 goto bss_ext_symbol;
145 }
146 #endif /* DBXREAD_ONLY */
147 continue; /* Just undefined, not COMMON */
148
149 case N_UNDF:
150 #ifdef DBXREAD_ONLY
151 if (processing_acc_compilation && bufp->n_strx == 1) {
152 /* Deal with relative offsets in the string table
153 used in ELF+STAB under Solaris. If we want to use the
154 n_strx field, which contains the name of the file,
155 we must adjust file_string_table_offset *before* calling
156 SET_NAMESTRING(). */
157 past_first_source_file = 1;
158 file_string_table_offset = next_file_string_table_offset;
159 next_file_string_table_offset =
160 file_string_table_offset + bufp->n_value;
161 if (next_file_string_table_offset < file_string_table_offset)
162 error ("string table offset backs up at %d", symnum);
163 /* FIXME -- replace error() with complaint. */
164 continue;
165 }
166 #endif /* DBXREAD_ONLY */
167 continue;
168
169 /* Lots of symbol types we can just ignore. */
170
171 case N_ABS:
172 case N_BSS:
173 case N_NBDATA:
174 case N_NBBSS:
175 continue;
176
177 /* Keep going . . .*/
178
179 /*
180 * Special symbol types for GNU
181 */
182 case N_INDR:
183 case N_INDR | N_EXT:
184 case N_SETA:
185 case N_SETA | N_EXT:
186 case N_SETT:
187 case N_SETT | N_EXT:
188 case N_SETD:
189 case N_SETD | N_EXT:
190 case N_SETB:
191 case N_SETB | N_EXT:
192 case N_SETV:
193 continue;
194
195 /*
196 * Debugger symbols
197 */
198
199 case N_SO: {
200 unsigned long valu = CUR_SYMBOL_VALUE;
201 static int prev_so_symnum = -10;
202 static int first_so_symnum;
203 char *p;
204
205 past_first_source_file = 1;
206
207 if (prev_so_symnum != symnum - 1)
208 { /* Here if prev stab wasn't N_SO */
209 first_so_symnum = symnum;
210
211 if (pst)
212 {
213 END_PSYMTAB (pst, psymtab_include_list, includes_used,
214 symnum * symbol_size, valu,
215 dependency_list, dependencies_used);
216 pst = (struct partial_symtab *) 0;
217 includes_used = 0;
218 dependencies_used = 0;
219 }
220 }
221
222 prev_so_symnum = symnum;
223
224 /* End the current partial symtab and start a new one */
225
226 SET_NAMESTRING();
227
228 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
229
230 /* Some compilers (including gcc) emit a pair of initial N_SOs.
231 The first one is a directory name; the second the file name.
232 If pst exists, is empty, and has a filename ending in '/',
233 we assume the previous N_SO was a directory name. */
234
235 p = strrchr (namestring, '/');
236 if (p && *(p+1) == '\000')
237 continue; /* Simply ignore directory name SOs */
238
239 /* Some other compilers (C++ ones in particular) emit useless
240 SOs for non-existant .c files. We ignore all subsequent SOs that
241 immediately follow the first. */
242
243 if (!pst)
244 pst = START_PSYMTAB (objfile, section_offsets,
245 namestring, valu,
246 first_so_symnum * symbol_size,
247 objfile -> global_psymbols.next,
248 objfile -> static_psymbols.next);
249 continue;
250 }
251
252 case N_BINCL:
253 #ifdef DBXREAD_ONLY
254 /* Add this bincl to the bincl_list for future EXCLs. No
255 need to save the string; it'll be around until
256 read_dbx_symtab function returns */
257
258 SET_NAMESTRING();
259
260 add_bincl_to_list (pst, namestring, CUR_SYMBOL_VALUE);
261
262 /* Mark down an include file in the current psymtab */
263
264 psymtab_include_list[includes_used++] = namestring;
265 if (includes_used >= includes_allocated)
266 {
267 char **orig = psymtab_include_list;
268
269 psymtab_include_list = (char **)
270 alloca ((includes_allocated *= 2) *
271 sizeof (char *));
272 memcpy ((PTR)psymtab_include_list, (PTR)orig,
273 includes_used * sizeof (char *));
274 }
275
276 #endif /* DBXREAD_ONLY */
277 continue;
278
279 case N_SOL:
280 /* Mark down an include file in the current psymtab */
281
282 SET_NAMESTRING();
283
284 /* In C++, one may expect the same filename to come round many
285 times, when code is coming alternately from the main file
286 and from inline functions in other files. So I check to see
287 if this is a file we've seen before -- either the main
288 source file, or a previously included file.
289
290 This seems to be a lot of time to be spending on N_SOL, but
291 things like "break c-exp.y:435" need to work (I
292 suppose the psymtab_include_list could be hashed or put
293 in a binary tree, if profiling shows this is a major hog). */
294 if (pst && !strcmp (namestring, pst->filename))
295 continue;
296 {
297 register int i;
298 for (i = 0; i < includes_used; i++)
299 if (!strcmp (namestring, psymtab_include_list[i]))
300 {
301 i = -1;
302 break;
303 }
304 if (i == -1)
305 continue;
306 }
307
308 psymtab_include_list[includes_used++] = namestring;
309 if (includes_used >= includes_allocated)
310 {
311 char **orig = psymtab_include_list;
312
313 psymtab_include_list = (char **)
314 alloca ((includes_allocated *= 2) *
315 sizeof (char *));
316 memcpy ((PTR)psymtab_include_list, (PTR)orig,
317 includes_used * sizeof (char *));
318 }
319 continue;
320
321 case N_LSYM: /* Typedef or automatic variable. */
322 case N_STSYM: /* Data seg var -- static */
323 case N_LCSYM: /* BSS " */
324 case N_ROSYM: /* Read-only data seg var -- static. */
325 case N_NBSTS: /* Gould nobase. */
326 case N_NBLCS: /* symbols. */
327
328 SET_NAMESTRING();
329
330 p = (char *) strchr (namestring, ':');
331
332 /* Skip if there is no :. */
333 if (!p) continue;
334
335 switch (p[1])
336 {
337 case 'T':
338 if (p != namestring) /* a name is there, not just :T... */
339 {
340 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
341 STRUCT_NAMESPACE, LOC_TYPEDEF,
342 objfile->static_psymbols, CUR_SYMBOL_VALUE);
343 if (p[2] == 't')
344 {
345 /* Also a typedef with the same name. */
346 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
347 VAR_NAMESPACE, LOC_TYPEDEF,
348 objfile->static_psymbols, CUR_SYMBOL_VALUE);
349 p += 1;
350 }
351 }
352 goto check_enum;
353 case 't':
354 if (p != namestring) /* a name is there, not just :T... */
355 {
356 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
357 VAR_NAMESPACE, LOC_TYPEDEF,
358 objfile->static_psymbols, CUR_SYMBOL_VALUE);
359 }
360 check_enum:
361 /* If this is an enumerated type, we need to
362 add all the enum constants to the partial symbol
363 table. This does not cover enums without names, e.g.
364 "enum {a, b} c;" in C, but fortunately those are
365 rare. There is no way for GDB to find those from the
366 enum type without spending too much time on it. Thus
367 to solve this problem, the compiler needs to put out separate
368 constant symbols ('c' N_LSYMS) for enum constants in
369 enums without names, or put out a dummy type. */
370
371 /* We are looking for something of the form
372 <name> ":" ("t" | "T") [<number> "="] "e"
373 {<constant> ":" <value> ","} ";". */
374
375 /* Skip over the colon and the 't' or 'T'. */
376 p += 2;
377 /* This type may be given a number. Also, numbers can come
378 in pairs like (0,26). Skip over it. */
379 while ((*p >= '0' && *p <= '9')
380 || *p == '(' || *p == ',' || *p == ')'
381 || *p == '=')
382 p++;
383
384 if (*p++ == 'e')
385 {
386 /* We have found an enumerated type. */
387 /* According to comments in read_enum_type
388 a comma could end it instead of a semicolon.
389 I don't know where that happens.
390 Accept either. */
391 while (*p && *p != ';' && *p != ',')
392 {
393 char *q;
394
395 /* Check for and handle cretinous dbx symbol name
396 continuation! */
397 if (*p == '\\')
398 p = next_symbol_text ();
399
400 /* Point to the character after the name
401 of the enum constant. */
402 for (q = p; *q && *q != ':'; q++)
403 ;
404 /* Note that the value doesn't matter for
405 enum constants in psymtabs, just in symtabs. */
406 ADD_PSYMBOL_TO_LIST (p, q - p,
407 VAR_NAMESPACE, LOC_CONST,
408 objfile->static_psymbols, 0);
409 /* Point past the name. */
410 p = q;
411 /* Skip over the value. */
412 while (*p && *p != ',')
413 p++;
414 /* Advance past the comma. */
415 if (*p)
416 p++;
417 }
418 }
419 continue;
420 case 'c':
421 /* Constant, e.g. from "const" in Pascal. */
422 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
423 VAR_NAMESPACE, LOC_CONST,
424 objfile->static_psymbols, CUR_SYMBOL_VALUE);
425 continue;
426 default:
427 /* Skip if the thing following the : is
428 not a letter (which indicates declaration of a local
429 variable, which we aren't interested in). */
430 continue;
431 }
432
433 case N_FUN:
434 case N_GSYM: /* Global (extern) variable; can be
435 data or bss (sigh FIXME). */
436
437 /* Following may probably be ignored; I'll leave them here
438 for now (until I do Pascal and Modula 2 extensions). */
439
440 case N_PC: /* I may or may not need this; I
441 suspect not. */
442 case N_M2C: /* I suspect that I can ignore this here. */
443 case N_SCOPE: /* Same. */
444
445 SET_NAMESTRING();
446
447 p = (char *) strchr (namestring, ':');
448 if (!p)
449 continue; /* Not a debugging symbol. */
450
451
452
453 /* Main processing section for debugging symbols which
454 the initial read through the symbol tables needs to worry
455 about. If we reach this point, the symbol which we are
456 considering is definitely one we are interested in.
457 p must also contain the (valid) index into the namestring
458 which indicates the debugging type symbol. */
459
460 switch (p[1])
461 {
462 case 'c':
463 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
464 VAR_NAMESPACE, LOC_CONST,
465 objfile->static_psymbols, CUR_SYMBOL_VALUE);
466 continue;
467 case 'S':
468 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
469 ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
470 VAR_NAMESPACE, LOC_STATIC,
471 objfile->static_psymbols, CUR_SYMBOL_VALUE);
472 continue;
473 case 'G':
474 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
475 /* The addresses in these entries are reported to be
476 wrong. See the code that reads 'G's for symtabs. */
477 ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
478 VAR_NAMESPACE, LOC_STATIC,
479 objfile->global_psymbols, CUR_SYMBOL_VALUE);
480 continue;
481
482 case 't':
483 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
484 VAR_NAMESPACE, LOC_TYPEDEF,
485 objfile->static_psymbols, CUR_SYMBOL_VALUE);
486 continue;
487
488 case 'f':
489 #ifdef DBXREAD_ONLY
490 /* Kludges for ELF/STABS with Sun ACC */
491 last_function_name = namestring;
492 if (pst && pst->textlow == 0)
493 pst->textlow = CUR_SYMBOL_VALUE;
494 #if 0
495 if (startup_file_end == 0)
496 startup_file_end = CUR_SYMBOL_VALUE;
497 #endif
498 /* End kludge. */
499 #endif /* DBXREAD_ONLY */
500 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
501 VAR_NAMESPACE, LOC_BLOCK,
502 objfile->static_psymbols, CUR_SYMBOL_VALUE);
503 continue;
504
505 /* Global functions were ignored here, but now they
506 are put into the global psymtab like one would expect.
507 They're also in the misc fn vector...
508 FIXME, why did it used to ignore these? That broke
509 "i fun" on these functions. */
510 case 'F':
511 #ifdef DBXREAD_ONLY
512 /* Kludges for ELF/STABS with Sun ACC */
513 last_function_name = namestring;
514 if (pst && pst->textlow == 0)
515 pst->textlow = CUR_SYMBOL_VALUE;
516 #if 0
517 if (startup_file_end == 0)
518 startup_file_end = CUR_SYMBOL_VALUE;
519 #endif
520 /* End kludge. */
521 #endif /* DBXREAD_ONLY */
522 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
523 VAR_NAMESPACE, LOC_BLOCK,
524 objfile->global_psymbols, CUR_SYMBOL_VALUE);
525 continue;
526
527 /* Two things show up here (hopefully); static symbols of
528 local scope (static used inside braces) or extensions
529 of structure symbols. We can ignore both. */
530 case 'V':
531 case '(':
532 case '0':
533 case '1':
534 case '2':
535 case '3':
536 case '4':
537 case '5':
538 case '6':
539 case '7':
540 case '8':
541 case '9':
542 continue;
543
544 default:
545 /* Unexpected symbol. Ignore it; perhaps it is an extension
546 that we don't know about.
547
548 Someone says sun cc puts out symbols like
549 /foo/baz/maclib::/usr/local/bin/maclib,
550 which would get here with a symbol type of ':'. */
551 continue;
552 }
553
554 case N_EXCL:
555 #ifdef DBXREAD_ONLY
556
557 SET_NAMESTRING();
558
559 /* Find the corresponding bincl and mark that psymtab on the
560 psymtab dependency list */
561 {
562 struct partial_symtab *needed_pst =
563 find_corresponding_bincl_psymtab (namestring, CUR_SYMBOL_VALUE);
564
565 /* If this include file was defined earlier in this file,
566 leave it alone. */
567 if (needed_pst == pst) continue;
568
569 if (needed_pst)
570 {
571 int i;
572 int found = 0;
573
574 for (i = 0; i < dependencies_used; i++)
575 if (dependency_list[i] == needed_pst)
576 {
577 found = 1;
578 break;
579 }
580
581 /* If it's already in the list, skip the rest. */
582 if (found) continue;
583
584 dependency_list[dependencies_used++] = needed_pst;
585 if (dependencies_used >= dependencies_allocated)
586 {
587 struct partial_symtab **orig = dependency_list;
588 dependency_list =
589 (struct partial_symtab **)
590 alloca ((dependencies_allocated *= 2)
591 * sizeof (struct partial_symtab *));
592 memcpy ((PTR)dependency_list, (PTR)orig,
593 (dependencies_used
594 * sizeof (struct partial_symtab *)));
595 #ifdef DEBUG_INFO
596 fprintf (stderr, "Had to reallocate dependency list.\n");
597 fprintf (stderr, "New dependencies allocated: %d\n",
598 dependencies_allocated);
599 #endif
600 }
601 }
602 else
603 error ("Invalid symbol data: \"repeated\" header file not previously seen, at symtab pos %d.",
604 symnum);
605 }
606 #endif /* DBXREAD_ONLY */
607 continue;
608
609 case N_RBRAC:
610 #ifdef HANDLE_RBRAC
611 HANDLE_RBRAC(CUR_SYMBOL_VALUE);
612 continue;
613 #endif
614 case N_EINCL:
615 case N_DSLINE:
616 case N_BSLINE:
617 case N_SSYM: /* Claim: Structure or union element.
618 Hopefully, I can ignore this. */
619 case N_ENTRY: /* Alternate entry point; can ignore. */
620 case N_MAIN: /* Can definitely ignore this. */
621 case N_CATCH: /* These are GNU C++ extensions */
622 case N_EHDECL: /* that can safely be ignored here. */
623 case N_LENG:
624 case N_BCOMM:
625 case N_ECOMM:
626 case N_ECOML:
627 case N_FNAME:
628 case N_SLINE:
629 case N_RSYM:
630 case N_PSYM:
631 case N_LBRAC:
632 case N_NSYMS: /* Ultrix 4.0: symbol count */
633 case N_DEFD: /* GNU Modula-2 */
634
635 case N_OBJ: /* useless types from Solaris */
636 case N_OPT:
637 case N_ENDM:
638 /* These symbols aren't interesting; don't worry about them */
639
640 continue;
641
642 default:
643 /* If we haven't found it yet, ignore it. It's probably some
644 new type we don't know about yet. */
645 complain (&unknown_symtype_complaint, local_hex_string(CUR_SYMBOL_TYPE));
646 continue;
647 }