Commit | Line | Data |
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5489fcc3 KR |
1 | #include "libiberty.h" |
2 | #include "gprof.h" | |
3 | #include "core.h" | |
4 | #include "symtab.h" | |
5 | ||
6 | bfd *core_bfd; | |
7 | int core_num_syms; | |
8 | asymbol **core_syms; | |
9 | asection *core_text_sect; | |
10 | PTR core_text_space; | |
11 | ||
12 | ||
13 | void | |
14 | DEFUN(core_init, (a_out_name), const char *a_out_name) | |
15 | { | |
16 | core_bfd = bfd_openr(a_out_name, 0); | |
17 | ||
18 | if (!core_bfd) { | |
19 | perror(a_out_name); | |
20 | done(1); | |
21 | } /* if */ | |
22 | ||
23 | if (!bfd_check_format(core_bfd, bfd_object)) { | |
24 | fprintf(stderr, "%s: %s: not in a.out format\n", whoami, a_out_name); | |
25 | done(1); | |
26 | } /* if */ | |
27 | ||
28 | /* get core's text section: */ | |
29 | core_text_sect = bfd_get_section_by_name(core_bfd, ".text"); | |
30 | if (!core_text_sect) { | |
31 | core_text_sect = bfd_get_section_by_name(core_bfd, "$CODE$"); | |
32 | if (!core_text_sect) { | |
33 | fprintf(stderr, "%s: can't find .text section in %s\n", | |
34 | whoami, a_out_name); | |
35 | done(1); | |
36 | } /* if */ | |
37 | } /* if */ | |
38 | ||
39 | /* read core's symbol table: */ | |
40 | ||
41 | /* this will probably give us more than we need, but that's ok: */ | |
42 | core_num_syms = bfd_get_symtab_upper_bound(core_bfd); | |
43 | if (core_num_syms < 0) { | |
44 | fprintf(stderr, "%s: %s: %s\n", whoami, a_out_name, | |
45 | bfd_errmsg(bfd_get_error())); | |
46 | done(1); | |
47 | } /* if */ | |
48 | ||
49 | core_syms = (asymbol**)xmalloc(core_num_syms); | |
50 | core_num_syms = bfd_canonicalize_symtab(core_bfd, core_syms); | |
51 | if (core_num_syms < 0) { | |
52 | fprintf(stderr, "%s: %s: %s\n", whoami, a_out_name, | |
53 | bfd_errmsg(bfd_get_error())); | |
54 | done(1); | |
55 | } /* if */ | |
56 | } /* core_init */ | |
57 | ||
58 | ||
59 | /* | |
60 | * Read in the text space of an a.out file | |
61 | */ | |
62 | void | |
63 | DEFUN(core_get_text_space, (core_bfd), bfd *core_bfd) | |
64 | { | |
65 | core_text_space = (PTR) malloc(core_text_sect->_raw_size); | |
66 | ||
67 | if (!core_text_space) { | |
68 | fprintf(stderr, "%s: ran out room for %ld bytes of text space\n", | |
69 | whoami, core_text_sect->_raw_size); | |
70 | done(1); | |
71 | } /* if */ | |
72 | if (!bfd_get_section_contents(core_bfd, core_text_sect, core_text_space, | |
73 | 0, core_text_sect->_raw_size)) | |
74 | { | |
75 | bfd_perror("bfd_get_section_contents"); | |
76 | free(core_text_space); | |
77 | core_text_space = 0; | |
78 | } /* if */ | |
79 | if (!core_text_space) { | |
80 | fprintf(stderr, "%s: can't do -c\n", whoami); | |
81 | } /* if */ | |
82 | } /* core_get_text_space */ | |
83 | ||
84 | ||
85 | /* | |
86 | * Return class of symbol SYM. The returned class can be any of: | |
87 | * 0 -> symbol is not interesting to us | |
88 | * 'T' -> symbol is a global name | |
89 | * 't' -> symbol is a local (static) name | |
90 | */ | |
91 | static int | |
92 | DEFUN(core_sym_class, (sym), asymbol *sym) | |
93 | { | |
94 | symbol_info syminfo; | |
95 | const char *name; | |
96 | char sym_prefix; | |
97 | int i; | |
98 | ||
99 | /* | |
100 | * Must be a text symbol, and static text symbols don't qualify if | |
101 | * ignore_static_funcs set. | |
102 | */ | |
103 | if (!sym->section) { | |
104 | return 0; | |
105 | } /* if */ | |
106 | ||
107 | if (ignore_static_funcs && (sym->flags & BSF_LOCAL)) { | |
108 | DBG(AOUTDEBUG, printf("[core_sym_class] %s: not a function\n", | |
109 | sym->name)); | |
110 | return 0; | |
111 | } /* if */ | |
112 | ||
113 | bfd_get_symbol_info(core_bfd, sym, &syminfo); | |
114 | i = syminfo.type; | |
115 | ||
116 | if (i == 'T') { | |
117 | return i; /* it's a global symbol */ | |
118 | } /* if */ | |
119 | ||
120 | if (i != 't') { | |
121 | /* not a static text symbol */ | |
122 | DBG(AOUTDEBUG, printf("[core_sym_class] %s is of class %c\n", | |
123 | sym->name, i)); | |
124 | return 0; | |
125 | } /* if */ | |
126 | ||
127 | /* do some more filtering on static function-names: */ | |
128 | ||
129 | if (ignore_static_funcs) { | |
130 | return 0; | |
131 | } /* if */ | |
132 | /* | |
133 | * Can't zero-length name or funny characters in name, where | |
134 | * `funny' includes: `.' (.o file names) and `$' (Pascal labels). | |
135 | */ | |
136 | if (!sym->name || sym->name[0] == '\0') { | |
137 | return 0; | |
138 | } /* if */ | |
139 | ||
140 | for (name = sym->name; *name; ++name) { | |
141 | if (*name == '.' || *name == '$') { | |
142 | return 0; | |
143 | } /* if */ | |
144 | } /* if */ | |
145 | /* | |
146 | * On systems where the C compiler adds an underscore to all | |
147 | * names, static names without underscores seem usually to be | |
148 | * labels in hand written assembler in the library. We don't want | |
149 | * these names. This is certainly necessary on a Sparc running | |
150 | * SunOS 4.1 (try profiling a program that does a lot of | |
151 | * division). I don't know whether it has harmful side effects on | |
152 | * other systems. Perhaps it should be made configurable. | |
153 | */ | |
154 | sym_prefix = bfd_get_symbol_leading_char(core_bfd); | |
155 | if (sym_prefix && sym_prefix != sym->name[0] | |
156 | /* | |
157 | * GCC may add special symbols to help gdb figure out the file | |
158 | * language. We want to ignore these, since sometimes they mask | |
159 | * the real function. (dj@ctron) | |
160 | */ | |
161 | || !strncmp (sym->name, "__gnu_compiled", 14) | |
162 | || !strncmp (sym->name, "___gnu_compiled", 15)) | |
163 | { | |
164 | return 0; | |
165 | } /* if */ | |
166 | return 't'; /* it's a static text symbol */ | |
167 | } /* core_sym_class */ | |
168 | ||
169 | ||
170 | /* | |
171 | * Get whatever source info we can get regarding address ADDR: | |
172 | */ | |
173 | static bool | |
174 | DEFUN(get_src_info, (addr, filename, name, line_num), | |
175 | bfd_vma addr AND const char **filename AND const char **name | |
176 | AND int *line_num) | |
177 | { | |
178 | const char *fname = 0, *func_name = 0; | |
179 | int l = 0; | |
180 | ||
181 | if (bfd_find_nearest_line(core_bfd, core_text_sect, core_syms, | |
182 | addr - core_text_sect->vma, | |
183 | &fname, &func_name, &l) | |
184 | && fname && func_name && l) | |
185 | { | |
186 | DBG(AOUTDEBUG, printf("[get_src_info] 0x%lx -> %s:%d (%s)\n", | |
187 | addr, fname, l, func_name)); | |
188 | *filename = fname; | |
189 | *name = func_name; | |
190 | *line_num = l; | |
191 | return TRUE; | |
192 | } else { | |
193 | DBG(AOUTDEBUG, printf("[get_src_info] no info for 0x%lx (%s:%d,%s)\n", | |
194 | (long) addr, fname ? fname : "<unknown>", l, | |
195 | func_name ? func_name : "<unknown>")); | |
196 | return FALSE; | |
197 | } /* if */ | |
198 | } /* get_src_info */ | |
199 | ||
200 | ||
201 | /* | |
202 | * Read in symbol table from core. One symbol per function is | |
203 | * entered. | |
204 | */ | |
205 | void | |
206 | DEFUN(core_create_function_syms, (core_bfd), bfd *core_bfd) | |
207 | { | |
208 | bfd_vma min_vma = ~0, max_vma = 0; | |
209 | const char *filename, *func_name; | |
210 | int class; | |
211 | long i; | |
212 | ||
213 | /* pass 1 - determine upper bound on number of function names: */ | |
214 | symtab.len = 0; | |
215 | for (i = 0; i < core_num_syms; ++i) { | |
216 | if (!core_sym_class(core_syms[i])) { | |
217 | continue; | |
218 | } /* if */ | |
219 | ++symtab.len; | |
220 | } /* for */ | |
221 | ||
222 | if (symtab.len == 0) { | |
223 | fprintf(stderr, "%s: file `%s' has no symbols\n", whoami, a_out_name); | |
224 | done(1); | |
225 | } /* if */ | |
226 | ||
227 | /* the "+ 2" is for the sentinels: */ | |
228 | symtab.base = (Sym*)xmalloc((symtab.len + 2) * sizeof(Sym)); | |
229 | ||
230 | /* pass 2 - create symbols: */ | |
231 | ||
232 | symtab.limit = symtab.base; | |
233 | for (i = 0; i < core_num_syms; ++i) { | |
234 | class = core_sym_class(core_syms[i]); | |
235 | if (!class) { | |
236 | DBG(AOUTDEBUG, | |
237 | printf("[core_create_function_syms] rejecting: 0x%lx %s\n", | |
238 | core_syms[i]->value, core_syms[i]->name)); | |
239 | continue; | |
240 | } /* if */ | |
241 | ||
242 | sym_init(symtab.limit); | |
243 | ||
244 | /* symbol offsets are always section-relative: */ | |
245 | ||
246 | symtab.limit->addr = core_syms[i]->value + core_syms[i]->section->vma; | |
247 | symtab.limit->name = core_syms[i]->name; | |
248 | ||
249 | #ifdef __osf__ | |
250 | /* | |
251 | * Suppress symbols that are not function names. This is | |
252 | * useful to suppress code-labels and aliases. | |
253 | * | |
254 | * This is known to be useful under DEC's OSF/1. Under SunOS 4.x, | |
255 | * labels do not appear in the symbol table info, so this isn't | |
256 | * necessary. | |
257 | */ | |
258 | if (get_src_info(symtab.limit->addr, &filename, &func_name, | |
259 | &symtab.limit->line_num)) | |
260 | { | |
261 | symtab.limit->file = source_file_lookup_path(filename); | |
262 | ||
263 | if (strcmp(symtab.limit->name, func_name) != 0) { | |
264 | /* | |
265 | * The symbol's address maps to a different name, so | |
266 | * it can't be a function-entry point. This happens | |
267 | * for labels, for example. | |
268 | */ | |
269 | DBG(AOUTDEBUG, | |
270 | printf("[core_create_function_syms: rej %s (maps to %s)\n", | |
271 | symtab.limit->name, func_name)); | |
272 | continue; | |
273 | } /* if */ | |
274 | } /* if */ | |
275 | #endif | |
276 | ||
277 | symtab.limit->is_func = TRUE; | |
278 | symtab.limit->is_bb_head = TRUE; | |
279 | if (class == 't') { | |
280 | symtab.limit->is_static = TRUE; | |
281 | } /* if */ | |
282 | ||
283 | min_vma = MIN(symtab.limit->addr, min_vma); | |
284 | max_vma = MAX(symtab.limit->addr, max_vma); | |
285 | ||
286 | /* | |
287 | * If we see "main" without an initial '_', we assume names | |
288 | * are *not* prefixed by '_'. | |
289 | */ | |
290 | if (symtab.limit->name[0] == 'm' && discard_underscores | |
291 | && strcmp(symtab.limit->name, "main") == 0) | |
292 | { | |
293 | discard_underscores = 0; | |
294 | } /* if */ | |
295 | ||
296 | DBG(AOUTDEBUG, printf("[core_create_function_syms] %ld %s 0x%lx\n", | |
297 | (long)(symtab.limit - symtab.base), | |
298 | symtab.limit->name, symtab.limit->addr)); | |
299 | ++symtab.limit; | |
300 | } /* for */ | |
301 | ||
302 | /* create sentinels: */ | |
303 | ||
304 | sym_init(symtab.limit); | |
305 | symtab.limit->name = "<locore>"; | |
306 | symtab.limit->addr = 0; | |
307 | symtab.limit->end_addr = min_vma - 1; | |
308 | ++symtab.limit; | |
309 | ||
310 | sym_init(symtab.limit); | |
311 | symtab.limit->name = "<hicore>"; | |
312 | symtab.limit->addr = max_vma + 1; | |
313 | symtab.limit->end_addr = ~0; | |
314 | ++symtab.limit; | |
315 | ||
316 | symtab.len = symtab.limit - symtab.base; | |
317 | symtab_finalize(&symtab); | |
318 | } /* core_create_function_syms */ | |
319 | ||
320 | ||
321 | /* | |
322 | * Read in symbol table from core. One symbol per line of source code | |
323 | * is entered. | |
324 | */ | |
325 | void | |
326 | DEFUN(core_create_line_syms, (core_bfd), bfd *core_bfd) | |
327 | { | |
328 | char prev_name[PATH_MAX], prev_filename[PATH_MAX]; | |
329 | bfd_vma vma, min_vma = ~0, max_vma = 0; | |
330 | bfd_vma offset, prev_offset, min_dist; | |
331 | Sym *prev, dummy, *sentinel, *sym; | |
332 | const char *filename; | |
333 | int prev_line_num, i; | |
334 | Sym_Table ltab; | |
335 | /* | |
336 | * Create symbols for functions as usual. This is necessary in | |
337 | * cases where parts of a program were not compiled with -g. For | |
338 | * those parts we still want to get info at the function level: | |
339 | */ | |
340 | core_create_function_syms(core_bfd); | |
341 | ||
342 | /* pass 1 - counter number of symbols: */ | |
343 | ||
344 | /* | |
345 | * To find all line information, walk through all possible | |
346 | * text-space addresses (one by one!) and get the debugging | |
347 | * info for each address. When the debugging info changes, | |
348 | * it is time to create a new symbol. | |
349 | * | |
350 | * Of course, this is rather slow and it would be better if | |
351 | * bfd would provide an iterator for enumerating all line | |
352 | * infos, but for now, we try to speed up the second pass | |
353 | * by determining what the minimum code distance between two | |
354 | * lines is. | |
355 | */ | |
356 | prev_name[0] = '\0'; | |
357 | ltab.len = 0; | |
358 | min_dist = core_text_sect->_raw_size; | |
359 | prev_offset = -min_dist; | |
360 | prev_filename[0] = '\0'; | |
361 | prev_line_num = 0; | |
362 | for (offset = 0; offset < core_text_sect->_raw_size; ++offset) { | |
363 | vma = core_text_sect->vma + offset; | |
364 | if (!get_src_info(vma, &filename, &dummy.name, &dummy.line_num) | |
365 | || (prev_line_num == dummy.line_num && | |
366 | strcmp(prev_name, dummy.name) == 0 | |
367 | && strcmp(prev_filename, filename) == 0)) | |
368 | { | |
369 | continue; | |
370 | } /* if */ | |
371 | ||
372 | ++ltab.len; | |
373 | prev_line_num = dummy.line_num; | |
374 | strcpy(prev_name, dummy.name); | |
375 | strcpy(prev_filename, filename); | |
376 | ||
377 | if (offset - prev_offset < min_dist) { | |
378 | min_dist = offset - prev_offset; | |
379 | } /* if */ | |
380 | prev_offset = offset; | |
381 | ||
382 | min_vma = MIN(vma, min_vma); | |
383 | max_vma = MAX(vma, max_vma); | |
384 | } /* for */ | |
385 | ||
386 | DBG(AOUTDEBUG, printf("[core_create_line_syms] min_dist=%lx\n", min_dist)); | |
387 | ||
388 | /* make room for function symbols, too: */ | |
389 | ltab.len += symtab.len; | |
390 | ltab.base = (Sym*) xmalloc(ltab.len * sizeof(Sym)); | |
391 | ltab.limit = ltab.base; | |
392 | ||
393 | /* pass 2 - create symbols: */ | |
394 | ||
395 | prev = 0; | |
396 | for (offset = 0; offset < core_text_sect->_raw_size; offset += min_dist) { | |
397 | sym_init(ltab.limit); | |
398 | if (!get_src_info(core_text_sect->vma + offset, &filename, | |
399 | <ab.limit->name, <ab.limit->line_num) | |
400 | || (prev && prev->line_num == ltab.limit->line_num | |
401 | && strcmp(prev->name, ltab.limit->name) == 0 | |
402 | && strcmp(prev->file->name, filename) == 0)) | |
403 | { | |
404 | continue; | |
405 | } /* if */ | |
406 | ||
407 | /* make name pointer a malloc'ed string: */ | |
408 | ltab.limit->name = strdup(ltab.limit->name); | |
409 | ltab.limit->file = source_file_lookup_path(filename); | |
410 | ||
411 | ltab.limit->addr = core_text_sect->vma + offset; | |
412 | prev = ltab.limit; | |
413 | ||
414 | /* | |
415 | * If we see "main" without an initial '_', we assume names | |
416 | * are *not* prefixed by '_'. | |
417 | */ | |
418 | if (ltab.limit->name[0] == 'm' && discard_underscores | |
419 | && strcmp(ltab.limit->name, "main") == 0) | |
420 | { | |
421 | discard_underscores = 0; | |
422 | } /* if */ | |
423 | ||
424 | DBG(AOUTDEBUG, printf("[core_create_line_syms] %d %s 0x%lx\n", | |
425 | ltab.len, ltab.limit->name, | |
426 | ltab.limit->addr)); | |
427 | ++ltab.limit; | |
428 | } /* for */ | |
429 | ||
430 | /* update sentinels: */ | |
431 | ||
432 | sentinel = sym_lookup(&symtab, 0); | |
433 | if (strcmp(sentinel->name, "<locore>") == 0 | |
434 | && min_vma <= sentinel->end_addr) | |
435 | { | |
436 | sentinel->end_addr = min_vma - 1; | |
437 | } /* if */ | |
438 | ||
439 | sentinel = sym_lookup(&symtab, ~0); | |
440 | if (strcmp(sentinel->name, "<hicore>") == 0 && max_vma >= sentinel->addr) { | |
441 | sentinel->addr = max_vma + 1; | |
442 | } /* if */ | |
443 | ||
444 | /* copy in function symbols: */ | |
445 | memcpy(ltab.limit, symtab.base, symtab.len * sizeof(Sym)); | |
446 | ltab.limit += symtab.len; | |
447 | ||
448 | if (ltab.limit - ltab.base != ltab.len) { | |
449 | fprintf(stderr, | |
450 | "%s: somebody miscounted: ltab.len=%ld instead of %d\n", | |
451 | whoami, (long) (ltab.limit - ltab.base), ltab.len); | |
452 | done(1); | |
453 | } /* if */ | |
454 | ||
455 | /* finalize ltab and make it symbol table: */ | |
456 | ||
457 | symtab_finalize(<ab); | |
458 | free(symtab.base); | |
459 | symtab = ltab; | |
460 | ||
461 | /* now go through all core symbols and set is_static accordingly: */ | |
462 | ||
463 | for (i = 0; i < core_num_syms; ++i) { | |
464 | if (core_sym_class(core_syms[i]) == 't') { | |
465 | sym = sym_lookup(&symtab, core_syms[i]->value | |
466 | + core_syms[i]->section->vma); | |
467 | do { | |
468 | sym++->is_static = TRUE; | |
469 | } while (sym->file == sym[-1].file && | |
470 | strcmp(sym->name, sym[-1].name) == 0); | |
471 | } /* if */ | |
472 | } /* for */ | |
473 | ||
474 | } /* core_create_line_syms */ | |
475 | ||
476 | /*** end of core.c ***/ |