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,
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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.
27 /* End of macro definitions, now let's handle them symbols! */
29 switch (CUR_SYMBOL_TYPE)
33 * Standard, external, non-debugger, symbols
37 case N_NBTEXT | N_EXT:
38 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
42 case N_NBDATA | N_EXT:
43 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
48 case N_SETV | N_EXT: /* FIXME, is this in BSS? */
49 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_BSS);
58 record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
59 CUR_SYMBOL_TYPE, objfile); /* Always */
60 #endif /* DBXREAD_ONLY */
63 /* Standard, local, non-debugger, symbols */
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. */
76 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
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' && STREQ (namestring, "end_file."))
87 #ifndef GDB_TARGET_IS_HPPA
88 if (objfile -> ei.entry_point < CUR_SYMBOL_VALUE &&
89 objfile -> ei.entry_point >= last_o_file_start)
91 objfile -> ei.entry_file_lowpc = last_o_file_start;
92 objfile -> ei.entry_file_highpc = CUR_SYMBOL_VALUE;
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)
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;
105 dependencies_used = 0;
108 past_first_source_file = 1;
109 last_o_file_start = CUR_SYMBOL_VALUE;
111 #endif /* DBXREAD_ONLY */
116 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
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 FIXME: this might want to check for _DYNAMIC and the current
121 symbol_leading_char. */
122 if (namestring[8] == 'C' && STREQ ("__DYNAMIC", namestring))
125 /* Same with virtual function tables, both global and static. */
127 char *tempstring = namestring;
128 if (tempstring[0] == bfd_get_symbol_leading_char (objfile->obfd))
130 if (VTBL_PREFIX_P ((tempstring)))
133 #endif /* DBXREAD_ONLY */
138 if (CUR_SYMBOL_VALUE != 0) {
139 /* This is a "Fortran COMMON" symbol. See if the target
140 environment knows where it has been relocated to. */
145 if (target_lookup_symbol (namestring, &reladdr)) {
146 continue; /* Error in lookup; ignore symbol for now. */
148 CUR_SYMBOL_TYPE ^= (N_BSS^N_UNDF); /* Define it as a bss-symbol */
149 CUR_SYMBOL_VALUE = reladdr;
152 #endif /* DBXREAD_ONLY */
153 continue; /* Just undefined, not COMMON */
157 if (processing_acc_compilation && bufp->n_strx == 1) {
158 /* Deal with relative offsets in the string table
159 used in ELF+STAB under Solaris. If we want to use the
160 n_strx field, which contains the name of the file,
161 we must adjust file_string_table_offset *before* calling
163 past_first_source_file = 1;
164 file_string_table_offset = next_file_string_table_offset;
165 next_file_string_table_offset =
166 file_string_table_offset + bufp->n_value;
167 if (next_file_string_table_offset < file_string_table_offset)
168 error ("string table offset backs up at %d", symnum);
169 /* FIXME -- replace error() with complaint. */
172 #endif /* DBXREAD_ONLY */
175 /* Lots of symbol types we can just ignore. */
183 /* Keep going . . .*/
186 * Special symbol types for GNU
206 unsigned long valu = CUR_SYMBOL_VALUE;
207 static int prev_so_symnum = -10;
208 static int first_so_symnum;
211 past_first_source_file = 1;
213 if (prev_so_symnum != symnum - 1)
214 { /* Here if prev stab wasn't N_SO */
215 first_so_symnum = symnum;
219 END_PSYMTAB (pst, psymtab_include_list, includes_used,
220 symnum * symbol_size, valu,
221 dependency_list, dependencies_used);
222 pst = (struct partial_symtab *) 0;
224 dependencies_used = 0;
228 prev_so_symnum = symnum;
230 /* End the current partial symtab and start a new one */
234 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
236 /* Some compilers (including gcc) emit a pair of initial N_SOs.
237 The first one is a directory name; the second the file name.
238 If pst exists, is empty, and has a filename ending in '/',
239 we assume the previous N_SO was a directory name. */
241 p = strrchr (namestring, '/');
242 if (p && *(p+1) == '\000')
243 continue; /* Simply ignore directory name SOs */
245 /* Some other compilers (C++ ones in particular) emit useless
246 SOs for non-existant .c files. We ignore all subsequent SOs that
247 immediately follow the first. */
250 pst = START_PSYMTAB (objfile, section_offsets,
252 first_so_symnum * symbol_size,
253 objfile -> global_psymbols.next,
254 objfile -> static_psymbols.next);
260 /* Add this bincl to the bincl_list for future EXCLs. No
261 need to save the string; it'll be around until
262 read_dbx_symtab function returns */
266 add_bincl_to_list (pst, namestring, CUR_SYMBOL_VALUE);
268 /* Mark down an include file in the current psymtab */
270 goto record_include_file;
272 #else /* DBXREAD_ONLY */
277 /* Mark down an include file in the current psymtab */
281 /* In C++, one may expect the same filename to come round many
282 times, when code is coming alternately from the main file
283 and from inline functions in other files. So I check to see
284 if this is a file we've seen before -- either the main
285 source file, or a previously included file.
287 This seems to be a lot of time to be spending on N_SOL, but
288 things like "break c-exp.y:435" need to work (I
289 suppose the psymtab_include_list could be hashed or put
290 in a binary tree, if profiling shows this is a major hog). */
291 if (pst && STREQ (namestring, pst->filename))
295 for (i = 0; i < includes_used; i++)
296 if (STREQ (namestring, psymtab_include_list[i]))
307 psymtab_include_list[includes_used++] = namestring;
308 if (includes_used >= includes_allocated)
310 char **orig = psymtab_include_list;
312 psymtab_include_list = (char **)
313 alloca ((includes_allocated *= 2) *
315 memcpy ((PTR)psymtab_include_list, (PTR)orig,
316 includes_used * sizeof (char *));
320 case N_LSYM: /* Typedef or automatic variable. */
321 case N_STSYM: /* Data seg var -- static */
322 case N_LCSYM: /* BSS " */
323 case N_ROSYM: /* Read-only data seg var -- static. */
324 case N_NBSTS: /* Gould nobase. */
325 case N_NBLCS: /* symbols. */
329 p = (char *) strchr (namestring, ':');
331 /* Skip if there is no :. */
337 if (p != namestring) /* a name is there, not just :T... */
339 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
340 STRUCT_NAMESPACE, LOC_TYPEDEF,
341 objfile->static_psymbols,
343 psymtab_language, objfile);
346 /* Also a typedef with the same name. */
347 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
348 VAR_NAMESPACE, LOC_TYPEDEF,
349 objfile->static_psymbols,
350 CUR_SYMBOL_VALUE, psymtab_language,
357 if (p != namestring) /* a name is there, not just :T... */
359 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
360 VAR_NAMESPACE, LOC_TYPEDEF,
361 objfile->static_psymbols,
363 psymtab_language, objfile);
366 /* If this is an enumerated type, we need to
367 add all the enum constants to the partial symbol
368 table. This does not cover enums without names, e.g.
369 "enum {a, b} c;" in C, but fortunately those are
370 rare. There is no way for GDB to find those from the
371 enum type without spending too much time on it. Thus
372 to solve this problem, the compiler needs to put out separate
373 constant symbols ('c' N_LSYMS) for enum constants in
374 enums without names, or put out a dummy type. */
376 /* We are looking for something of the form
377 <name> ":" ("t" | "T") [<number> "="] "e"
378 {<constant> ":" <value> ","} ";". */
380 /* Skip over the colon and the 't' or 'T'. */
382 /* This type may be given a number. Also, numbers can come
383 in pairs like (0,26). Skip over it. */
384 while ((*p >= '0' && *p <= '9')
385 || *p == '(' || *p == ',' || *p == ')'
391 /* We have found an enumerated type. */
392 /* According to comments in read_enum_type
393 a comma could end it instead of a semicolon.
394 I don't know where that happens.
396 while (*p && *p != ';' && *p != ',')
400 /* Check for and handle cretinous dbx symbol name
403 p = next_symbol_text ();
405 /* Point to the character after the name
406 of the enum constant. */
407 for (q = p; *q && *q != ':'; q++)
409 /* Note that the value doesn't matter for
410 enum constants in psymtabs, just in symtabs. */
411 ADD_PSYMBOL_TO_LIST (p, q - p,
412 VAR_NAMESPACE, LOC_CONST,
413 objfile->static_psymbols, 0,
414 psymtab_language, objfile);
415 /* Point past the name. */
417 /* Skip over the value. */
418 while (*p && *p != ',')
420 /* Advance past the comma. */
427 /* Constant, e.g. from "const" in Pascal. */
428 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
429 VAR_NAMESPACE, LOC_CONST,
430 objfile->static_psymbols, CUR_SYMBOL_VALUE,
431 psymtab_language, objfile);
434 /* Skip if the thing following the : is
435 not a letter (which indicates declaration of a local
436 variable, which we aren't interested in). */
441 case N_GSYM: /* Global (extern) variable; can be
442 data or bss (sigh FIXME). */
444 /* Following may probably be ignored; I'll leave them here
445 for now (until I do Pascal and Modula 2 extensions). */
447 case N_PC: /* I may or may not need this; I
449 case N_M2C: /* I suspect that I can ignore this here. */
450 case N_SCOPE: /* Same. */
454 p = (char *) strchr (namestring, ':');
456 continue; /* Not a debugging symbol. */
460 /* Main processing section for debugging symbols which
461 the initial read through the symbol tables needs to worry
462 about. If we reach this point, the symbol which we are
463 considering is definitely one we are interested in.
464 p must also contain the (valid) index into the namestring
465 which indicates the debugging type symbol. */
470 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
471 VAR_NAMESPACE, LOC_CONST,
472 objfile->static_psymbols, CUR_SYMBOL_VALUE,
473 psymtab_language, objfile);
476 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
477 ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
478 VAR_NAMESPACE, LOC_STATIC,
479 objfile->static_psymbols,
481 psymtab_language, objfile);
484 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
485 /* The addresses in these entries are reported to be
486 wrong. See the code that reads 'G's for symtabs. */
487 ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
488 VAR_NAMESPACE, LOC_STATIC,
489 objfile->global_psymbols,
491 psymtab_language, objfile);
495 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
496 VAR_NAMESPACE, LOC_TYPEDEF,
497 objfile->static_psymbols, CUR_SYMBOL_VALUE,
498 psymtab_language, objfile);
503 /* Kludges for ELF/STABS with Sun ACC */
504 last_function_name = namestring;
505 if (pst && pst->textlow == 0)
506 pst->textlow = CUR_SYMBOL_VALUE;
508 if (startup_file_end == 0)
509 startup_file_end = CUR_SYMBOL_VALUE;
512 #endif /* DBXREAD_ONLY */
513 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
514 VAR_NAMESPACE, LOC_BLOCK,
515 objfile->static_psymbols, CUR_SYMBOL_VALUE,
516 psymtab_language, objfile);
519 /* Global functions were ignored here, but now they
520 are put into the global psymtab like one would expect.
521 They're also in the misc fn vector...
522 FIXME, why did it used to ignore these? That broke
523 "i fun" on these functions. */
526 /* Kludges for ELF/STABS with Sun ACC */
527 last_function_name = namestring;
528 if (pst && pst->textlow == 0)
529 pst->textlow = CUR_SYMBOL_VALUE;
531 if (startup_file_end == 0)
532 startup_file_end = CUR_SYMBOL_VALUE;
535 #endif /* DBXREAD_ONLY */
536 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
537 VAR_NAMESPACE, LOC_BLOCK,
538 objfile->global_psymbols, CUR_SYMBOL_VALUE,
539 psymtab_language, objfile);
542 /* Two things show up here (hopefully); static symbols of
543 local scope (static used inside braces) or extensions
544 of structure symbols. We can ignore both. */
560 /* Unexpected symbol. Ignore it; perhaps it is an extension
561 that we don't know about.
563 Someone says sun cc puts out symbols like
564 /foo/baz/maclib::/usr/local/bin/maclib,
565 which would get here with a symbol type of ':'. */
574 /* Find the corresponding bincl and mark that psymtab on the
575 psymtab dependency list */
577 struct partial_symtab *needed_pst =
578 find_corresponding_bincl_psymtab (namestring, CUR_SYMBOL_VALUE);
580 /* If this include file was defined earlier in this file,
582 if (needed_pst == pst) continue;
589 for (i = 0; i < dependencies_used; i++)
590 if (dependency_list[i] == needed_pst)
596 /* If it's already in the list, skip the rest. */
599 dependency_list[dependencies_used++] = needed_pst;
600 if (dependencies_used >= dependencies_allocated)
602 struct partial_symtab **orig = dependency_list;
604 (struct partial_symtab **)
605 alloca ((dependencies_allocated *= 2)
606 * sizeof (struct partial_symtab *));
607 memcpy ((PTR)dependency_list, (PTR)orig,
609 * sizeof (struct partial_symtab *)));
611 fprintf (stderr, "Had to reallocate dependency list.\n");
612 fprintf (stderr, "New dependencies allocated: %d\n",
613 dependencies_allocated);
618 error ("Invalid symbol data: \"repeated\" header file not previously seen, at symtab pos %d.",
621 #endif /* DBXREAD_ONLY */
626 HANDLE_RBRAC(CUR_SYMBOL_VALUE);
632 case N_SSYM: /* Claim: Structure or union element.
633 Hopefully, I can ignore this. */
634 case N_ENTRY: /* Alternate entry point; can ignore. */
635 case N_MAIN: /* Can definitely ignore this. */
636 case N_CATCH: /* These are GNU C++ extensions */
637 case N_EHDECL: /* that can safely be ignored here. */
647 case N_NSYMS: /* Ultrix 4.0: symbol count */
648 case N_DEFD: /* GNU Modula-2 */
650 case N_OBJ: /* useless types from Solaris */
653 /* These symbols aren't interesting; don't worry about them */
658 /* If we haven't found it yet, ignore it. It's probably some
659 new type we don't know about yet. */
660 complain (&unknown_symtype_complaint,
661 local_hex_string (CUR_SYMBOL_TYPE));