1 /* Shared code to pre-read a stab (dbx-style), when building a psymtab.
2 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
3 Free Software Foundation, Inc.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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.
25 namestring - variable pointing to the name of the stab.
26 section_offsets - variable pointing to the section offsets.
27 pst - the partial symbol table being built.
29 psymtab_include_list, includes_used, includes_allocated - list of include
30 file names (N_SOL) seen so far.
31 dependency_list, dependencies_used, dependencies_allocated - list of
32 N_EXCL stabs seen so far.
34 END_PSYMTAB -- end a partial symbol table.
35 START_PSYMTAB -- start a partial symbol table.
38 /* End of macro definitions, now let's handle them symbols! */
40 switch (CUR_SYMBOL_TYPE)
44 * Standard, external, non-debugger, symbols
48 case N_NBTEXT | N_EXT:
49 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
53 case N_NBDATA | N_EXT:
54 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
60 case N_SETV | N_EXT: /* FIXME, is this in BSS? */
61 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_BSS);
70 record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
71 CUR_SYMBOL_TYPE, objfile); /* Always */
72 #endif /* DBXREAD_ONLY */
75 /* Standard, local, non-debugger, symbols */
79 /* We need to be able to deal with both N_FN or N_TEXT,
80 because we have no way of knowing whether the sys-supplied ld
81 or GNU ld was used to make the executable. Sequents throw
82 in another wrinkle -- they renumbered N_FN. */
88 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
90 if ((namestring[0] == '-' && namestring[1] == 'l')
91 || (namestring [(nsl = strlen (namestring)) - 1] == 'o'
92 && namestring [nsl - 2] == '.'))
94 if (objfile -> ei.entry_point < CUR_SYMBOL_VALUE &&
95 objfile -> ei.entry_point >= last_o_file_start)
97 objfile -> ei.entry_file_lowpc = last_o_file_start;
98 objfile -> ei.entry_file_highpc = CUR_SYMBOL_VALUE;
100 if (past_first_source_file && pst
101 /* The gould NP1 uses low values for .o and -l symbols
102 which are not the address. */
103 && CUR_SYMBOL_VALUE >= pst->textlow)
105 END_PSYMTAB (pst, psymtab_include_list, includes_used,
106 symnum * symbol_size,
107 CUR_SYMBOL_VALUE > pst->texthigh
108 ? CUR_SYMBOL_VALUE : pst->texthigh,
109 dependency_list, dependencies_used, textlow_not_set);
110 pst = (struct partial_symtab *) 0;
112 dependencies_used = 0;
115 past_first_source_file = 1;
116 last_o_file_start = CUR_SYMBOL_VALUE;
120 #endif /* DBXREAD_ONLY */
124 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
129 if (CUR_SYMBOL_VALUE != 0) {
130 /* This is a "Fortran COMMON" symbol. See if the target
131 environment knows where it has been relocated to. */
136 if (target_lookup_symbol (namestring, &reladdr)) {
137 continue; /* Error in lookup; ignore symbol for now. */
139 CUR_SYMBOL_TYPE ^= (N_BSS^N_UNDF); /* Define it as a bss-symbol */
140 CUR_SYMBOL_VALUE = reladdr;
143 #endif /* DBXREAD_ONLY */
144 continue; /* Just undefined, not COMMON */
148 if (processing_acc_compilation && bufp->n_strx == 1) {
149 /* Deal with relative offsets in the string table
150 used in ELF+STAB under Solaris. If we want to use the
151 n_strx field, which contains the name of the file,
152 we must adjust file_string_table_offset *before* calling
154 past_first_source_file = 1;
155 file_string_table_offset = next_file_string_table_offset;
156 next_file_string_table_offset =
157 file_string_table_offset + bufp->n_value;
158 if (next_file_string_table_offset < file_string_table_offset)
159 error ("string table offset backs up at %d", symnum);
160 /* FIXME -- replace error() with complaint. */
163 #endif /* DBXREAD_ONLY */
166 /* Lots of symbol types we can just ignore. */
173 /* Keep going . . .*/
176 * Special symbol types for GNU
197 static int prev_so_symnum = -10;
198 static int first_so_symnum;
200 int prev_textlow_not_set;
202 valu = CUR_SYMBOL_VALUE + ANOFFSET (section_offsets, SECT_OFF_TEXT);
204 prev_textlow_not_set = textlow_not_set;
206 #ifdef SOFUN_ADDRESS_MAYBE_MISSING
207 /* A zero value is probably an indication for the SunPRO 3.0
208 compiler. end_psymtab explicitly tests for zero, so
209 don't relocate it. */
211 if (CUR_SYMBOL_VALUE == 0)
221 past_first_source_file = 1;
223 if (prev_so_symnum != symnum - 1)
224 { /* Here if prev stab wasn't N_SO */
225 first_so_symnum = symnum;
229 END_PSYMTAB (pst, psymtab_include_list, includes_used,
230 symnum * symbol_size,
231 valu > pst->texthigh ? valu : pst->texthigh,
232 dependency_list, dependencies_used,
233 prev_textlow_not_set);
234 pst = (struct partial_symtab *) 0;
236 dependencies_used = 0;
240 prev_so_symnum = symnum;
242 /* End the current partial symtab and start a new one */
246 /* Null name means end of .o file. Don't start a new one. */
247 if (*namestring == '\000')
250 /* Some compilers (including gcc) emit a pair of initial N_SOs.
251 The first one is a directory name; the second the file name.
252 If pst exists, is empty, and has a filename ending in '/',
253 we assume the previous N_SO was a directory name. */
255 p = strrchr (namestring, '/');
256 if (p && *(p+1) == '\000')
257 continue; /* Simply ignore directory name SOs */
259 /* Some other compilers (C++ ones in particular) emit useless
260 SOs for non-existant .c files. We ignore all subsequent SOs that
261 immediately follow the first. */
264 pst = START_PSYMTAB (objfile, section_offsets,
266 first_so_symnum * symbol_size,
267 objfile -> global_psymbols.next,
268 objfile -> static_psymbols.next);
275 enum language tmp_language;
276 /* Add this bincl to the bincl_list for future EXCLs. No
277 need to save the string; it'll be around until
278 read_dbx_symtab function returns */
282 tmp_language = deduce_language_from_filename (namestring);
284 /* Only change the psymtab's language if we've learned
285 something useful (eg. tmp_language is not language_unknown).
286 In addition, to match what start_subfile does, never change
288 if (tmp_language != language_unknown
289 && (tmp_language != language_c
290 || psymtab_language != language_cplus))
291 psymtab_language = tmp_language;
293 add_bincl_to_list (pst, namestring, CUR_SYMBOL_VALUE);
295 /* Mark down an include file in the current psymtab */
297 goto record_include_file;
299 #else /* DBXREAD_ONLY */
306 enum language tmp_language;
307 /* Mark down an include file in the current psymtab */
311 tmp_language = deduce_language_from_filename (namestring);
313 /* Only change the psymtab's language if we've learned
314 something useful (eg. tmp_language is not language_unknown).
315 In addition, to match what start_subfile does, never change
317 if (tmp_language != language_unknown
318 && (tmp_language != language_c
319 || psymtab_language != language_cplus))
320 psymtab_language = tmp_language;
322 /* In C++, one may expect the same filename to come round many
323 times, when code is coming alternately from the main file
324 and from inline functions in other files. So I check to see
325 if this is a file we've seen before -- either the main
326 source file, or a previously included file.
328 This seems to be a lot of time to be spending on N_SOL, but
329 things like "break c-exp.y:435" need to work (I
330 suppose the psymtab_include_list could be hashed or put
331 in a binary tree, if profiling shows this is a major hog). */
332 if (pst && STREQ (namestring, pst->filename))
336 for (i = 0; i < includes_used; i++)
337 if (STREQ (namestring, psymtab_include_list[i]))
350 psymtab_include_list[includes_used++] = namestring;
351 if (includes_used >= includes_allocated)
353 char **orig = psymtab_include_list;
355 psymtab_include_list = (char **)
356 alloca ((includes_allocated *= 2) *
358 memcpy ((PTR)psymtab_include_list, (PTR)orig,
359 includes_used * sizeof (char *));
363 case N_LSYM: /* Typedef or automatic variable. */
364 case N_STSYM: /* Data seg var -- static */
365 case N_LCSYM: /* BSS " */
366 case N_ROSYM: /* Read-only data seg var -- static. */
367 case N_NBSTS: /* Gould nobase. */
368 case N_NBLCS: /* symbols. */
370 case N_GSYM: /* Global (extern) variable; can be
371 data or bss (sigh FIXME). */
373 /* Following may probably be ignored; I'll leave them here
374 for now (until I do Pascal and Modula 2 extensions). */
376 case N_PC: /* I may or may not need this; I
378 case N_M2C: /* I suspect that I can ignore this here. */
379 case N_SCOPE: /* Same. */
384 /* See if this is an end of function stab. */
385 if (CUR_SYMBOL_TYPE == N_FUN && ! strcmp (namestring, ""))
389 /* It's value is the size (in bytes) of the function for
390 function relative stabs, or the address of the function's
391 end for old style stabs. */
392 valu = CUR_SYMBOL_VALUE + last_function_start;
393 if (pst->texthigh == 0 || valu > pst->texthigh)
394 pst->texthigh = valu;
399 p = (char *) strchr (namestring, ':');
401 continue; /* Not a debugging symbol. */
405 /* Main processing section for debugging symbols which
406 the initial read through the symbol tables needs to worry
407 about. If we reach this point, the symbol which we are
408 considering is definitely one we are interested in.
409 p must also contain the (valid) index into the namestring
410 which indicates the debugging type symbol. */
415 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
416 #ifdef STATIC_TRANSFORM_NAME
417 namestring = STATIC_TRANSFORM_NAME (namestring);
419 add_psymbol_to_list (namestring, p - namestring,
420 VAR_NAMESPACE, LOC_STATIC,
421 &objfile->static_psymbols,
423 psymtab_language, objfile);
426 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
427 /* The addresses in these entries are reported to be
428 wrong. See the code that reads 'G's for symtabs. */
429 add_psymbol_to_list (namestring, p - namestring,
430 VAR_NAMESPACE, LOC_STATIC,
431 &objfile->global_psymbols,
433 psymtab_language, objfile);
437 if (p != namestring) /* a name is there, not just :T... */
439 add_psymbol_to_list (namestring, p - namestring,
440 STRUCT_NAMESPACE, LOC_TYPEDEF,
441 &objfile->static_psymbols,
443 psymtab_language, objfile);
446 /* Also a typedef with the same name. */
447 add_psymbol_to_list (namestring, p - namestring,
448 VAR_NAMESPACE, LOC_TYPEDEF,
449 &objfile->static_psymbols,
451 psymtab_language, objfile);
454 /* The semantics of C++ state that "struct foo { ... }"
455 also defines a typedef for "foo". Unfortuantely, cfront
456 never makes the typedef when translating from C++ to C.
457 We make the typedef here so that "ptype foo" works as
458 expected for cfront translated code. */
459 else if (psymtab_language == language_cplus)
461 /* Also a typedef with the same name. */
462 add_psymbol_to_list (namestring, p - namestring,
463 VAR_NAMESPACE, LOC_TYPEDEF,
464 &objfile->static_psymbols,
466 psymtab_language, objfile);
471 if (p != namestring) /* a name is there, not just :T... */
473 add_psymbol_to_list (namestring, p - namestring,
474 VAR_NAMESPACE, LOC_TYPEDEF,
475 &objfile->static_psymbols,
477 psymtab_language, objfile);
480 /* If this is an enumerated type, we need to
481 add all the enum constants to the partial symbol
482 table. This does not cover enums without names, e.g.
483 "enum {a, b} c;" in C, but fortunately those are
484 rare. There is no way for GDB to find those from the
485 enum type without spending too much time on it. Thus
486 to solve this problem, the compiler needs to put out the
487 enum in a nameless type. GCC2 does this. */
489 /* We are looking for something of the form
490 <name> ":" ("t" | "T") [<number> "="] "e"
491 {<constant> ":" <value> ","} ";". */
493 /* Skip over the colon and the 't' or 'T'. */
495 /* This type may be given a number. Also, numbers can come
496 in pairs like (0,26). Skip over it. */
497 while ((*p >= '0' && *p <= '9')
498 || *p == '(' || *p == ',' || *p == ')'
504 /* The aix4 compiler emits extra crud before the members. */
507 /* Skip over the type (?). */
511 /* Skip over the colon. */
515 /* We have found an enumerated type. */
516 /* According to comments in read_enum_type
517 a comma could end it instead of a semicolon.
518 I don't know where that happens.
520 while (*p && *p != ';' && *p != ',')
524 /* Check for and handle cretinous dbx symbol name
526 if (*p == '\\' || (*p == '?' && p[1] == '\0'))
527 p = next_symbol_text (objfile);
529 /* Point to the character after the name
530 of the enum constant. */
531 for (q = p; *q && *q != ':'; q++)
533 /* Note that the value doesn't matter for
534 enum constants in psymtabs, just in symtabs. */
535 add_psymbol_to_list (p, q - p,
536 VAR_NAMESPACE, LOC_CONST,
537 &objfile->static_psymbols, 0,
538 0, psymtab_language, objfile);
539 /* Point past the name. */
541 /* Skip over the value. */
542 while (*p && *p != ',')
544 /* Advance past the comma. */
551 /* Constant, e.g. from "const" in Pascal. */
552 add_psymbol_to_list (namestring, p - namestring,
553 VAR_NAMESPACE, LOC_CONST,
554 &objfile->static_psymbols, CUR_SYMBOL_VALUE,
555 0, psymtab_language, objfile);
559 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
561 /* Keep track of the start of the last function so we
562 can handle end of function symbols. */
563 last_function_start = CUR_SYMBOL_VALUE;
564 /* Kludges for ELF/STABS with Sun ACC */
565 last_function_name = namestring;
566 #ifdef SOFUN_ADDRESS_MAYBE_MISSING
567 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
568 value for the bottom of the text seg in those cases. */
569 if (pst && textlow_not_set)
572 find_stab_function_addr (namestring, pst, objfile);
577 if (startup_file_end == 0)
578 startup_file_end = CUR_SYMBOL_VALUE;
582 /* In reordered executables this function may lie outside
583 the bounds created by N_SO symbols. If that's the case
584 use the address of this function as the low bound for
585 the partial symbol table. */
587 || (CUR_SYMBOL_VALUE < pst->textlow
589 != ANOFFSET (section_offsets, SECT_OFF_TEXT)))
591 pst->textlow = CUR_SYMBOL_VALUE;
594 #endif /* DBXREAD_ONLY */
595 add_psymbol_to_list (namestring, p - namestring,
596 VAR_NAMESPACE, LOC_BLOCK,
597 &objfile->static_psymbols, CUR_SYMBOL_VALUE,
598 0, psymtab_language, objfile);
601 /* Global functions were ignored here, but now they
602 are put into the global psymtab like one would expect.
603 They're also in the minimal symbol table. */
605 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
607 /* Keep track of the start of the last function so we
608 can handle end of function symbols. */
609 last_function_start = CUR_SYMBOL_VALUE;
610 /* Kludges for ELF/STABS with Sun ACC */
611 last_function_name = namestring;
612 #ifdef SOFUN_ADDRESS_MAYBE_MISSING
613 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
614 value for the bottom of the text seg in those cases. */
615 if (pst && textlow_not_set)
618 find_stab_function_addr (namestring, pst, objfile);
623 if (startup_file_end == 0)
624 startup_file_end = CUR_SYMBOL_VALUE;
627 /* In reordered executables this function may lie outside
628 the bounds created by N_SO symbols. If that's the case
629 use the address of this function as the low bound for
630 the partial symbol table. */
632 || (CUR_SYMBOL_VALUE < pst->textlow
634 != ANOFFSET (section_offsets, SECT_OFF_TEXT)))
636 pst->textlow = CUR_SYMBOL_VALUE;
639 #endif /* DBXREAD_ONLY */
640 add_psymbol_to_list (namestring, p - namestring,
641 VAR_NAMESPACE, LOC_BLOCK,
642 &objfile->global_psymbols, CUR_SYMBOL_VALUE,
643 0, psymtab_language, objfile);
646 /* Two things show up here (hopefully); static symbols of
647 local scope (static used inside braces) or extensions
648 of structure symbols. We can ignore both. */
662 /* added to support cfront stabs strings */
663 case 'Z': /* for definition continuations */
664 case 'P': /* for prototypes */
668 /* It is a C++ nested symbol. We don't need to record it
669 (I don't think); if we try to look up foo::bar::baz,
670 then symbols for the symtab containing foo should get
672 /* Someone says sun cc puts out symbols like
673 /foo/baz/maclib::/usr/local/bin/maclib,
674 which would get here with a symbol type of ':'. */
678 /* Unexpected symbol descriptor. The second and subsequent stabs
679 of a continued stab can show up here. The question is
680 whether they ever can mimic a normal stab--it would be
681 nice if not, since we certainly don't want to spend the
682 time searching to the end of every string looking for
685 complain (&unknown_symchar_complaint, p[1]);
687 /* Ignore it; perhaps it is an extension that we don't
697 /* Find the corresponding bincl and mark that psymtab on the
698 psymtab dependency list */
700 struct partial_symtab *needed_pst =
701 find_corresponding_bincl_psymtab (namestring, CUR_SYMBOL_VALUE);
703 /* If this include file was defined earlier in this file,
705 if (needed_pst == pst) continue;
712 for (i = 0; i < dependencies_used; i++)
713 if (dependency_list[i] == needed_pst)
719 /* If it's already in the list, skip the rest. */
722 dependency_list[dependencies_used++] = needed_pst;
723 if (dependencies_used >= dependencies_allocated)
725 struct partial_symtab **orig = dependency_list;
727 (struct partial_symtab **)
728 alloca ((dependencies_allocated *= 2)
729 * sizeof (struct partial_symtab *));
730 memcpy ((PTR)dependency_list, (PTR)orig,
732 * sizeof (struct partial_symtab *)));
734 fprintf_unfiltered (gdb_stderr, "Had to reallocate dependency list.\n");
735 fprintf_unfiltered (gdb_stderr, "New dependencies allocated: %d\n",
736 dependencies_allocated);
741 #endif /* DBXREAD_ONLY */
745 #ifdef SOFUN_ADDRESS_MAYBE_MISSING
746 /* Solaris 2 end of module, finish current partial symbol table.
747 END_PSYMTAB will set pst->texthigh to the proper value, which
748 is necessary if a module compiled without debugging info
749 follows this module. */
752 END_PSYMTAB (pst, psymtab_include_list, includes_used,
753 symnum * symbol_size,
755 dependency_list, dependencies_used, textlow_not_set);
756 pst = (struct partial_symtab *) 0;
758 dependencies_used = 0;
765 HANDLE_RBRAC(CUR_SYMBOL_VALUE);
771 case N_SSYM: /* Claim: Structure or union element.
772 Hopefully, I can ignore this. */
773 case N_ENTRY: /* Alternate entry point; can ignore. */
774 case N_MAIN: /* Can definitely ignore this. */
775 case N_CATCH: /* These are GNU C++ extensions */
776 case N_EHDECL: /* that can safely be ignored here. */
786 case N_NSYMS: /* Ultrix 4.0: symbol count */
787 case N_DEFD: /* GNU Modula-2 */
789 case N_OBJ: /* useless types from Solaris */
791 /* These symbols aren't interesting; don't worry about them */
796 /* If we haven't found it yet, ignore it. It's probably some
797 new type we don't know about yet. */
798 complain (&unknown_symtype_complaint,
799 local_hex_string (CUR_SYMBOL_TYPE));