1 /* Shared code to pre-read a stab (dbx-style), when building a psymtab.
2 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993
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., 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);
49 case N_SETV | N_EXT: /* FIXME, is this in BSS? */
50 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_BSS);
59 record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
60 CUR_SYMBOL_TYPE, objfile); /* Always */
61 #endif /* DBXREAD_ONLY */
64 /* Standard, local, non-debugger, symbols */
68 /* We need to be able to deal with both N_FN or N_TEXT,
69 because we have no way of knowing whether the sys-supplied ld
70 or GNU ld was used to make the executable. Sequents throw
71 in another wrinkle -- they renumbered N_FN. */
77 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
79 if ((namestring[0] == '-' && namestring[1] == 'l')
80 || (namestring [(nsl = strlen (namestring)) - 1] == 'o'
81 && namestring [nsl - 2] == '.')
82 #ifdef GDB_TARGET_IS_HPPA
83 /* some cooperation from gcc to get around ld stupidity */
84 || (namestring[0] == 'e' && STREQ (namestring, "end_file."))
88 #ifndef GDB_TARGET_IS_HPPA
89 if (objfile -> ei.entry_point < CUR_SYMBOL_VALUE &&
90 objfile -> ei.entry_point >= last_o_file_start)
92 objfile -> ei.entry_file_lowpc = last_o_file_start;
93 objfile -> ei.entry_file_highpc = CUR_SYMBOL_VALUE;
96 if (past_first_source_file && pst
97 /* The gould NP1 uses low values for .o and -l symbols
98 which are not the address. */
99 && CUR_SYMBOL_VALUE >= pst->textlow)
101 END_PSYMTAB (pst, psymtab_include_list, includes_used,
102 symnum * symbol_size, CUR_SYMBOL_VALUE,
103 dependency_list, dependencies_used);
104 pst = (struct partial_symtab *) 0;
106 dependencies_used = 0;
109 past_first_source_file = 1;
110 last_o_file_start = CUR_SYMBOL_VALUE;
114 #endif /* DBXREAD_ONLY */
118 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
123 if (CUR_SYMBOL_VALUE != 0) {
124 /* This is a "Fortran COMMON" symbol. See if the target
125 environment knows where it has been relocated to. */
130 if (target_lookup_symbol (namestring, &reladdr)) {
131 continue; /* Error in lookup; ignore symbol for now. */
133 CUR_SYMBOL_TYPE ^= (N_BSS^N_UNDF); /* Define it as a bss-symbol */
134 CUR_SYMBOL_VALUE = reladdr;
137 #endif /* DBXREAD_ONLY */
138 continue; /* Just undefined, not COMMON */
142 if (processing_acc_compilation && bufp->n_strx == 1) {
143 /* Deal with relative offsets in the string table
144 used in ELF+STAB under Solaris. If we want to use the
145 n_strx field, which contains the name of the file,
146 we must adjust file_string_table_offset *before* calling
148 past_first_source_file = 1;
149 file_string_table_offset = next_file_string_table_offset;
150 next_file_string_table_offset =
151 file_string_table_offset + bufp->n_value;
152 if (next_file_string_table_offset < file_string_table_offset)
153 error ("string table offset backs up at %d", symnum);
154 /* FIXME -- replace error() with complaint. */
157 #endif /* DBXREAD_ONLY */
160 /* Lots of symbol types we can just ignore. */
167 /* Keep going . . .*/
170 * Special symbol types for GNU
191 static int prev_so_symnum = -10;
192 static int first_so_symnum;
195 valu = CUR_SYMBOL_VALUE + ANOFFSET (section_offsets, SECT_OFF_TEXT);
197 past_first_source_file = 1;
199 if (prev_so_symnum != symnum - 1)
200 { /* Here if prev stab wasn't N_SO */
201 first_so_symnum = symnum;
205 END_PSYMTAB (pst, psymtab_include_list, includes_used,
206 symnum * symbol_size, valu,
207 dependency_list, dependencies_used);
208 pst = (struct partial_symtab *) 0;
210 dependencies_used = 0;
214 prev_so_symnum = symnum;
216 /* End the current partial symtab and start a new one */
220 /* Some compilers (including gcc) emit a pair of initial N_SOs.
221 The first one is a directory name; the second the file name.
222 If pst exists, is empty, and has a filename ending in '/',
223 we assume the previous N_SO was a directory name. */
225 p = strrchr (namestring, '/');
226 if (p && *(p+1) == '\000')
227 continue; /* Simply ignore directory name SOs */
229 /* Some other compilers (C++ ones in particular) emit useless
230 SOs for non-existant .c files. We ignore all subsequent SOs that
231 immediately follow the first. */
234 pst = START_PSYMTAB (objfile, section_offsets,
236 first_so_symnum * symbol_size,
237 objfile -> global_psymbols.next,
238 objfile -> static_psymbols.next);
244 /* Add this bincl to the bincl_list for future EXCLs. No
245 need to save the string; it'll be around until
246 read_dbx_symtab function returns */
250 add_bincl_to_list (pst, namestring, CUR_SYMBOL_VALUE);
252 /* Mark down an include file in the current psymtab */
254 goto record_include_file;
256 #else /* DBXREAD_ONLY */
261 /* Mark down an include file in the current psymtab */
265 /* In C++, one may expect the same filename to come round many
266 times, when code is coming alternately from the main file
267 and from inline functions in other files. So I check to see
268 if this is a file we've seen before -- either the main
269 source file, or a previously included file.
271 This seems to be a lot of time to be spending on N_SOL, but
272 things like "break c-exp.y:435" need to work (I
273 suppose the psymtab_include_list could be hashed or put
274 in a binary tree, if profiling shows this is a major hog). */
275 if (pst && STREQ (namestring, pst->filename))
279 for (i = 0; i < includes_used; i++)
280 if (STREQ (namestring, psymtab_include_list[i]))
293 psymtab_include_list[includes_used++] = namestring;
294 if (includes_used >= includes_allocated)
296 char **orig = psymtab_include_list;
298 psymtab_include_list = (char **)
299 alloca ((includes_allocated *= 2) *
301 memcpy ((PTR)psymtab_include_list, (PTR)orig,
302 includes_used * sizeof (char *));
306 case N_LSYM: /* Typedef or automatic variable. */
307 case N_STSYM: /* Data seg var -- static */
308 case N_LCSYM: /* BSS " */
309 case N_ROSYM: /* Read-only data seg var -- static. */
310 case N_NBSTS: /* Gould nobase. */
311 case N_NBLCS: /* symbols. */
313 case N_GSYM: /* Global (extern) variable; can be
314 data or bss (sigh FIXME). */
316 /* Following may probably be ignored; I'll leave them here
317 for now (until I do Pascal and Modula 2 extensions). */
319 case N_PC: /* I may or may not need this; I
321 case N_M2C: /* I suspect that I can ignore this here. */
322 case N_SCOPE: /* Same. */
326 p = (char *) strchr (namestring, ':');
328 continue; /* Not a debugging symbol. */
332 /* Main processing section for debugging symbols which
333 the initial read through the symbol tables needs to worry
334 about. If we reach this point, the symbol which we are
335 considering is definitely one we are interested in.
336 p must also contain the (valid) index into the namestring
337 which indicates the debugging type symbol. */
342 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
343 ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
344 VAR_NAMESPACE, LOC_STATIC,
345 objfile->static_psymbols,
347 psymtab_language, objfile);
350 CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
351 /* The addresses in these entries are reported to be
352 wrong. See the code that reads 'G's for symtabs. */
353 ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
354 VAR_NAMESPACE, LOC_STATIC,
355 objfile->global_psymbols,
357 psymtab_language, objfile);
361 if (p != namestring) /* a name is there, not just :T... */
363 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
364 STRUCT_NAMESPACE, LOC_TYPEDEF,
365 objfile->static_psymbols,
367 psymtab_language, objfile);
370 /* Also a typedef with the same name. */
371 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
372 VAR_NAMESPACE, LOC_TYPEDEF,
373 objfile->static_psymbols,
374 CUR_SYMBOL_VALUE, psymtab_language,
381 if (p != namestring) /* a name is there, not just :T... */
383 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
384 VAR_NAMESPACE, LOC_TYPEDEF,
385 objfile->static_psymbols,
387 psymtab_language, objfile);
390 /* If this is an enumerated type, we need to
391 add all the enum constants to the partial symbol
392 table. This does not cover enums without names, e.g.
393 "enum {a, b} c;" in C, but fortunately those are
394 rare. There is no way for GDB to find those from the
395 enum type without spending too much time on it. Thus
396 to solve this problem, the compiler needs to put out the
397 enum in a nameless type. GCC2 does this. */
399 /* We are looking for something of the form
400 <name> ":" ("t" | "T") [<number> "="] "e"
401 {<constant> ":" <value> ","} ";". */
403 /* Skip over the colon and the 't' or 'T'. */
405 /* This type may be given a number. Also, numbers can come
406 in pairs like (0,26). Skip over it. */
407 while ((*p >= '0' && *p <= '9')
408 || *p == '(' || *p == ',' || *p == ')'
414 /* We have found an enumerated type. */
415 /* According to comments in read_enum_type
416 a comma could end it instead of a semicolon.
417 I don't know where that happens.
419 while (*p && *p != ';' && *p != ',')
423 /* Check for and handle cretinous dbx symbol name
426 p = next_symbol_text ();
428 /* Point to the character after the name
429 of the enum constant. */
430 for (q = p; *q && *q != ':'; q++)
432 /* Note that the value doesn't matter for
433 enum constants in psymtabs, just in symtabs. */
434 ADD_PSYMBOL_TO_LIST (p, q - p,
435 VAR_NAMESPACE, LOC_CONST,
436 objfile->static_psymbols, 0,
437 psymtab_language, objfile);
438 /* Point past the name. */
440 /* Skip over the value. */
441 while (*p && *p != ',')
443 /* Advance past the comma. */
450 /* Constant, e.g. from "const" in Pascal. */
451 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
452 VAR_NAMESPACE, LOC_CONST,
453 objfile->static_psymbols, CUR_SYMBOL_VALUE,
454 psymtab_language, objfile);
459 /* Kludges for ELF/STABS with Sun ACC */
460 last_function_name = namestring;
461 if (pst && pst->textlow == 0)
462 pst->textlow = CUR_SYMBOL_VALUE;
464 if (startup_file_end == 0)
465 startup_file_end = CUR_SYMBOL_VALUE;
468 #endif /* DBXREAD_ONLY */
469 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
470 VAR_NAMESPACE, LOC_BLOCK,
471 objfile->static_psymbols, CUR_SYMBOL_VALUE,
472 psymtab_language, objfile);
475 /* Global functions were ignored here, but now they
476 are put into the global psymtab like one would expect.
477 They're also in the minimal symbol table. */
480 /* Kludges for ELF/STABS with Sun ACC */
481 last_function_name = namestring;
482 if (pst && pst->textlow == 0)
483 pst->textlow = CUR_SYMBOL_VALUE;
485 if (startup_file_end == 0)
486 startup_file_end = CUR_SYMBOL_VALUE;
489 #endif /* DBXREAD_ONLY */
490 ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
491 VAR_NAMESPACE, LOC_BLOCK,
492 objfile->global_psymbols, CUR_SYMBOL_VALUE,
493 psymtab_language, objfile);
496 /* Two things show up here (hopefully); static symbols of
497 local scope (static used inside braces) or extensions
498 of structure symbols. We can ignore both. */
514 /* Unexpected symbol. Ignore it; perhaps it is an extension
515 that we don't know about.
517 Someone says sun cc puts out symbols like
518 /foo/baz/maclib::/usr/local/bin/maclib,
519 which would get here with a symbol type of ':'. */
520 complain (&unknown_symchar_complaint, p[1]);
529 /* Find the corresponding bincl and mark that psymtab on the
530 psymtab dependency list */
532 struct partial_symtab *needed_pst =
533 find_corresponding_bincl_psymtab (namestring, CUR_SYMBOL_VALUE);
535 /* If this include file was defined earlier in this file,
537 if (needed_pst == pst) continue;
544 for (i = 0; i < dependencies_used; i++)
545 if (dependency_list[i] == needed_pst)
551 /* If it's already in the list, skip the rest. */
554 dependency_list[dependencies_used++] = needed_pst;
555 if (dependencies_used >= dependencies_allocated)
557 struct partial_symtab **orig = dependency_list;
559 (struct partial_symtab **)
560 alloca ((dependencies_allocated *= 2)
561 * sizeof (struct partial_symtab *));
562 memcpy ((PTR)dependency_list, (PTR)orig,
564 * sizeof (struct partial_symtab *)));
566 fprintf (stderr, "Had to reallocate dependency list.\n");
567 fprintf (stderr, "New dependencies allocated: %d\n",
568 dependencies_allocated);
573 error ("Invalid symbol data: \"repeated\" header file not previously seen, at symtab pos %d.",
576 #endif /* DBXREAD_ONLY */
581 HANDLE_RBRAC(CUR_SYMBOL_VALUE);
587 case N_SSYM: /* Claim: Structure or union element.
588 Hopefully, I can ignore this. */
589 case N_ENTRY: /* Alternate entry point; can ignore. */
590 case N_MAIN: /* Can definitely ignore this. */
591 case N_CATCH: /* These are GNU C++ extensions */
592 case N_EHDECL: /* that can safely be ignored here. */
602 case N_NSYMS: /* Ultrix 4.0: symbol count */
603 case N_DEFD: /* GNU Modula-2 */
605 case N_OBJ: /* useless types from Solaris */
608 /* These symbols aren't interesting; don't worry about them */
613 /* If we haven't found it yet, ignore it. It's probably some
614 new type we don't know about yet. */
615 complain (&unknown_symtype_complaint,
616 local_hex_string ((unsigned long) CUR_SYMBOL_TYPE));