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c906108c | 1 | /* GDB routines for manipulating the minimal symbol tables. |
4a94e368 | 2 | Copyright (C) 1992-2022 Free Software Foundation, Inc. |
c906108c SS |
3 | Contributed by Cygnus Support, using pieces from other GDB modules. |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
19 | |
20 | ||
21 | /* This file contains support routines for creating, manipulating, and | |
22 | destroying minimal symbol tables. | |
23 | ||
24 | Minimal symbol tables are used to hold some very basic information about | |
25 | all defined global symbols (text, data, bss, abs, etc). The only two | |
26 | required pieces of information are the symbol's name and the address | |
27 | associated with that symbol. | |
28 | ||
29 | In many cases, even if a file was compiled with no special options for | |
30 | debugging at all, as long as was not stripped it will contain sufficient | |
31 | information to build useful minimal symbol tables using this structure. | |
c5aa993b | 32 | |
c906108c SS |
33 | Even when a file contains enough debugging information to build a full |
34 | symbol table, these minimal symbols are still useful for quickly mapping | |
35 | between names and addresses, and vice versa. They are also sometimes used | |
025bb325 | 36 | to figure out what full symbol table entries need to be read in. */ |
c906108c SS |
37 | |
38 | ||
39 | #include "defs.h" | |
9227b5eb | 40 | #include <ctype.h> |
c906108c SS |
41 | #include "symtab.h" |
42 | #include "bfd.h" | |
0ba1096a | 43 | #include "filenames.h" |
c906108c SS |
44 | #include "symfile.h" |
45 | #include "objfiles.h" | |
46 | #include "demangle.h" | |
7ed49443 JB |
47 | #include "value.h" |
48 | #include "cp-abi.h" | |
42848c96 | 49 | #include "target.h" |
71c25dea TT |
50 | #include "cp-support.h" |
51 | #include "language.h" | |
529480d0 | 52 | #include "cli/cli-utils.h" |
268a13a5 | 53 | #include "gdbsupport/symbol.h" |
b5ec771e | 54 | #include <algorithm> |
deeeba55 | 55 | #include "safe-ctype.h" |
d55c9a68 | 56 | #include "gdbsupport/parallel-for.h" |
328d42d8 | 57 | #include "inferior.h" |
d55c9a68 TT |
58 | |
59 | #if CXX_STD_THREAD | |
60 | #include <mutex> | |
61 | #endif | |
c906108c | 62 | |
17d305ef TV |
63 | /* Return true if MINSYM is a cold clone symbol. |
64 | Recognize f.i. these symbols (mangled/demangled): | |
65 | - _ZL3foov.cold | |
66 | foo() [clone .cold] | |
67 | - _ZL9do_rpo_vnP8functionP8edge_defP11bitmap_headbb.cold.138 | |
68 | do_rpo_vn(function*, edge_def*, bitmap_head*, bool, bool) \ | |
69 | [clone .cold.138]. */ | |
70 | ||
71 | static bool | |
72 | msymbol_is_cold_clone (minimal_symbol *minsym) | |
73 | { | |
74 | const char *name = minsym->natural_name (); | |
75 | size_t name_len = strlen (name); | |
76 | if (name_len < 1) | |
77 | return false; | |
78 | ||
79 | const char *last = &name[name_len - 1]; | |
80 | if (*last != ']') | |
81 | return false; | |
82 | ||
83 | const char *suffix = " [clone .cold"; | |
84 | size_t suffix_len = strlen (suffix); | |
85 | const char *found = strstr (name, suffix); | |
86 | if (found == nullptr) | |
87 | return false; | |
88 | ||
89 | const char *start = &found[suffix_len]; | |
90 | if (*start == ']') | |
91 | return true; | |
92 | ||
93 | if (*start != '.') | |
94 | return false; | |
95 | ||
96 | const char *p; | |
97 | for (p = start + 1; p <= last; ++p) | |
98 | { | |
99 | if (*p >= '0' && *p <= '9') | |
100 | continue; | |
101 | break; | |
102 | } | |
103 | ||
104 | if (p == last) | |
105 | return true; | |
106 | ||
107 | return false; | |
108 | } | |
109 | ||
bf223d3e PA |
110 | /* See minsyms.h. */ |
111 | ||
112 | bool | |
4024cf2b PA |
113 | msymbol_is_function (struct objfile *objfile, minimal_symbol *minsym, |
114 | CORE_ADDR *func_address_p) | |
bf223d3e | 115 | { |
4aeddc50 | 116 | CORE_ADDR msym_addr = minsym->value_address (objfile); |
4024cf2b | 117 | |
60f62e2b | 118 | switch (minsym->type ()) |
bf223d3e | 119 | { |
4024cf2b PA |
120 | case mst_slot_got_plt: |
121 | case mst_data: | |
122 | case mst_bss: | |
123 | case mst_abs: | |
124 | case mst_file_data: | |
125 | case mst_file_bss: | |
f50776aa | 126 | case mst_data_gnu_ifunc: |
4024cf2b | 127 | { |
08feed99 | 128 | struct gdbarch *gdbarch = objfile->arch (); |
328d42d8 SM |
129 | CORE_ADDR pc = gdbarch_convert_from_func_ptr_addr |
130 | (gdbarch, msym_addr, current_inferior ()->top_target ()); | |
4024cf2b PA |
131 | if (pc != msym_addr) |
132 | { | |
133 | if (func_address_p != NULL) | |
134 | *func_address_p = pc; | |
135 | return true; | |
136 | } | |
137 | return false; | |
138 | } | |
17d305ef TV |
139 | case mst_file_text: |
140 | /* Ignore function symbol that is not a function entry. */ | |
141 | if (msymbol_is_cold_clone (minsym)) | |
142 | return false; | |
143 | /* fallthru */ | |
bf223d3e | 144 | default: |
4024cf2b PA |
145 | if (func_address_p != NULL) |
146 | *func_address_p = msym_addr; | |
147 | return true; | |
bf223d3e PA |
148 | } |
149 | } | |
150 | ||
c906108c | 151 | /* Accumulate the minimal symbols for each objfile in bunches of BUNCH_SIZE. |
79e7ae11 | 152 | At the end, copy them all into one newly allocated array. */ |
c906108c SS |
153 | |
154 | #define BUNCH_SIZE 127 | |
155 | ||
156 | struct msym_bunch | |
c5aa993b JM |
157 | { |
158 | struct msym_bunch *next; | |
159 | struct minimal_symbol contents[BUNCH_SIZE]; | |
160 | }; | |
c906108c | 161 | |
b19686e0 | 162 | /* See minsyms.h. */ |
9227b5eb JB |
163 | |
164 | unsigned int | |
165 | msymbol_hash_iw (const char *string) | |
166 | { | |
167 | unsigned int hash = 0; | |
b8d56208 | 168 | |
9227b5eb JB |
169 | while (*string && *string != '(') |
170 | { | |
f1735a53 | 171 | string = skip_spaces (string); |
9227b5eb | 172 | if (*string && *string != '(') |
375f3d86 | 173 | { |
59d7bcaf | 174 | hash = SYMBOL_HASH_NEXT (hash, *string); |
375f3d86 DJ |
175 | ++string; |
176 | } | |
9227b5eb | 177 | } |
261397f8 | 178 | return hash; |
9227b5eb JB |
179 | } |
180 | ||
b19686e0 | 181 | /* See minsyms.h. */ |
9227b5eb JB |
182 | |
183 | unsigned int | |
184 | msymbol_hash (const char *string) | |
185 | { | |
186 | unsigned int hash = 0; | |
b8d56208 | 187 | |
9227b5eb | 188 | for (; *string; ++string) |
59d7bcaf | 189 | hash = SYMBOL_HASH_NEXT (hash, *string); |
261397f8 | 190 | return hash; |
9227b5eb JB |
191 | } |
192 | ||
193 | /* Add the minimal symbol SYM to an objfile's minsym hash table, TABLE. */ | |
984ac464 | 194 | static void |
9227b5eb | 195 | add_minsym_to_hash_table (struct minimal_symbol *sym, |
f29d7f6b CB |
196 | struct minimal_symbol **table, |
197 | unsigned int hash_value) | |
9227b5eb JB |
198 | { |
199 | if (sym->hash_next == NULL) | |
200 | { | |
f29d7f6b | 201 | unsigned int hash = hash_value % MINIMAL_SYMBOL_HASH_SIZE; |
b8d56208 | 202 | |
9227b5eb JB |
203 | sym->hash_next = table[hash]; |
204 | table[hash] = sym; | |
205 | } | |
206 | } | |
207 | ||
0729fd50 DB |
208 | /* Add the minimal symbol SYM to an objfile's minsym demangled hash table, |
209 | TABLE. */ | |
210 | static void | |
211 | add_minsym_to_demangled_hash_table (struct minimal_symbol *sym, | |
f29d7f6b CB |
212 | struct objfile *objfile, |
213 | unsigned int hash_value) | |
0729fd50 DB |
214 | { |
215 | if (sym->demangled_hash_next == NULL) | |
216 | { | |
c1b5c1eb | 217 | objfile->per_bfd->demangled_hash_languages.set (sym->language ()); |
b5ec771e PA |
218 | |
219 | struct minimal_symbol **table | |
220 | = objfile->per_bfd->msymbol_demangled_hash; | |
f29d7f6b | 221 | unsigned int hash_index = hash_value % MINIMAL_SYMBOL_HASH_SIZE; |
b5ec771e PA |
222 | sym->demangled_hash_next = table[hash_index]; |
223 | table[hash_index] = sym; | |
224 | } | |
225 | } | |
b8d56208 | 226 | |
b5ec771e PA |
227 | /* Worker object for lookup_minimal_symbol. Stores temporary results |
228 | while walking the symbol tables. */ | |
229 | ||
230 | struct found_minimal_symbols | |
231 | { | |
232 | /* External symbols are best. */ | |
f6b3ad54 | 233 | bound_minimal_symbol external_symbol; |
b5ec771e PA |
234 | |
235 | /* File-local symbols are next best. */ | |
f6b3ad54 | 236 | bound_minimal_symbol file_symbol; |
b5ec771e PA |
237 | |
238 | /* Symbols for shared library trampolines are next best. */ | |
f6b3ad54 | 239 | bound_minimal_symbol trampoline_symbol; |
b5ec771e PA |
240 | |
241 | /* Called when a symbol name matches. Check if the minsym is a | |
242 | better type than what we had already found, and record it in one | |
243 | of the members fields if so. Returns true if we collected the | |
244 | real symbol, in which case we can stop searching. */ | |
245 | bool maybe_collect (const char *sfile, objfile *objf, | |
246 | minimal_symbol *msymbol); | |
247 | }; | |
248 | ||
249 | /* See declaration above. */ | |
250 | ||
251 | bool | |
252 | found_minimal_symbols::maybe_collect (const char *sfile, | |
253 | struct objfile *objfile, | |
254 | minimal_symbol *msymbol) | |
255 | { | |
60f62e2b | 256 | switch (msymbol->type ()) |
b5ec771e PA |
257 | { |
258 | case mst_file_text: | |
259 | case mst_file_data: | |
260 | case mst_file_bss: | |
261 | if (sfile == NULL | |
262 | || filename_cmp (msymbol->filename, sfile) == 0) | |
263 | { | |
264 | file_symbol.minsym = msymbol; | |
265 | file_symbol.objfile = objfile; | |
266 | } | |
267 | break; | |
268 | ||
269 | case mst_solib_trampoline: | |
270 | ||
271 | /* If a trampoline symbol is found, we prefer to keep | |
272 | looking for the *real* symbol. If the actual symbol | |
273 | is not found, then we'll use the trampoline | |
274 | entry. */ | |
275 | if (trampoline_symbol.minsym == NULL) | |
276 | { | |
277 | trampoline_symbol.minsym = msymbol; | |
278 | trampoline_symbol.objfile = objfile; | |
279 | } | |
280 | break; | |
281 | ||
282 | case mst_unknown: | |
283 | default: | |
284 | external_symbol.minsym = msymbol; | |
285 | external_symbol.objfile = objfile; | |
286 | /* We have the real symbol. No use looking further. */ | |
287 | return true; | |
288 | } | |
289 | ||
290 | /* Keep looking. */ | |
291 | return false; | |
292 | } | |
293 | ||
294 | /* Walk the mangled name hash table, and pass each symbol whose name | |
295 | matches LOOKUP_NAME according to NAMECMP to FOUND. */ | |
296 | ||
297 | static void | |
298 | lookup_minimal_symbol_mangled (const char *lookup_name, | |
299 | const char *sfile, | |
300 | struct objfile *objfile, | |
301 | struct minimal_symbol **table, | |
302 | unsigned int hash, | |
303 | int (*namecmp) (const char *, const char *), | |
304 | found_minimal_symbols &found) | |
305 | { | |
306 | for (minimal_symbol *msymbol = table[hash]; | |
307 | msymbol != NULL; | |
308 | msymbol = msymbol->hash_next) | |
309 | { | |
c9d95fa3 | 310 | const char *symbol_name = msymbol->linkage_name (); |
b5ec771e PA |
311 | |
312 | if (namecmp (symbol_name, lookup_name) == 0 | |
313 | && found.maybe_collect (sfile, objfile, msymbol)) | |
314 | return; | |
315 | } | |
316 | } | |
317 | ||
318 | /* Walk the demangled name hash table, and pass each symbol whose name | |
319 | matches LOOKUP_NAME according to MATCHER to FOUND. */ | |
320 | ||
321 | static void | |
322 | lookup_minimal_symbol_demangled (const lookup_name_info &lookup_name, | |
323 | const char *sfile, | |
324 | struct objfile *objfile, | |
325 | struct minimal_symbol **table, | |
326 | unsigned int hash, | |
327 | symbol_name_matcher_ftype *matcher, | |
328 | found_minimal_symbols &found) | |
329 | { | |
330 | for (minimal_symbol *msymbol = table[hash]; | |
331 | msymbol != NULL; | |
332 | msymbol = msymbol->demangled_hash_next) | |
333 | { | |
c9d95fa3 | 334 | const char *symbol_name = msymbol->search_name (); |
b5ec771e PA |
335 | |
336 | if (matcher (symbol_name, lookup_name, NULL) | |
337 | && found.maybe_collect (sfile, objfile, msymbol)) | |
338 | return; | |
0729fd50 DB |
339 | } |
340 | } | |
341 | ||
c906108c SS |
342 | /* Look through all the current minimal symbol tables and find the |
343 | first minimal symbol that matches NAME. If OBJF is non-NULL, limit | |
72a5efb3 DJ |
344 | the search to that objfile. If SFILE is non-NULL, the only file-scope |
345 | symbols considered will be from that source file (global symbols are | |
346 | still preferred). Returns a pointer to the minimal symbol that | |
c906108c SS |
347 | matches, or NULL if no match is found. |
348 | ||
349 | Note: One instance where there may be duplicate minimal symbols with | |
350 | the same name is when the symbol tables for a shared library and the | |
351 | symbol tables for an executable contain global symbols with the same | |
d73f140a JB |
352 | names (the dynamic linker deals with the duplication). |
353 | ||
354 | It's also possible to have minimal symbols with different mangled | |
355 | names, but identical demangled names. For example, the GNU C++ v3 | |
356 | ABI requires the generation of two (or perhaps three) copies of | |
357 | constructor functions --- "in-charge", "not-in-charge", and | |
358 | "allocate" copies; destructors may be duplicated as well. | |
359 | Obviously, there must be distinct mangled names for each of these, | |
360 | but the demangled names are all the same: S::S or S::~S. */ | |
c906108c | 361 | |
3b7344d5 TT |
362 | struct bound_minimal_symbol |
363 | lookup_minimal_symbol (const char *name, const char *sfile, | |
364 | struct objfile *objf) | |
c906108c | 365 | { |
b5ec771e | 366 | found_minimal_symbols found; |
c906108c | 367 | |
b5ec771e | 368 | unsigned int mangled_hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
9227b5eb | 369 | |
b5ec771e PA |
370 | auto *mangled_cmp |
371 | = (case_sensitivity == case_sensitive_on | |
372 | ? strcmp | |
373 | : strcasecmp); | |
71c25dea | 374 | |
c906108c | 375 | if (sfile != NULL) |
9f37bbcc | 376 | sfile = lbasename (sfile); |
c906108c | 377 | |
b5ec771e | 378 | lookup_name_info lookup_name (name, symbol_name_match_type::FULL); |
71c25dea | 379 | |
bf227d61 | 380 | for (objfile *objfile : current_program_space->objfiles ()) |
c906108c | 381 | { |
bf227d61 TT |
382 | if (found.external_symbol.minsym != NULL) |
383 | break; | |
384 | ||
56e3f43c | 385 | if (objf == NULL || objf == objfile |
15d123c9 | 386 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 387 | { |
b5ec771e PA |
388 | if (symbol_lookup_debug) |
389 | { | |
6cb06a8c TT |
390 | gdb_printf (gdb_stdlog, |
391 | "lookup_minimal_symbol (%s, %s, %s)\n", | |
392 | name, sfile != NULL ? sfile : "NULL", | |
393 | objfile_debug_name (objfile)); | |
b5ec771e PA |
394 | } |
395 | ||
9227b5eb JB |
396 | /* Do two passes: the first over the ordinary hash table, |
397 | and the second over the demangled hash table. */ | |
b5ec771e PA |
398 | lookup_minimal_symbol_mangled (name, sfile, objfile, |
399 | objfile->per_bfd->msymbol_hash, | |
400 | mangled_hash, mangled_cmp, found); | |
cc485e62 | 401 | |
b5ec771e PA |
402 | /* If not found, try the demangled hash table. */ |
403 | if (found.external_symbol.minsym == NULL) | |
c906108c | 404 | { |
b5ec771e PA |
405 | /* Once for each language in the demangled hash names |
406 | table (usually just zero or one languages). */ | |
1b7a07cb | 407 | for (unsigned iter = 0; iter < nr_languages; ++iter) |
c906108c | 408 | { |
1b7a07cb TT |
409 | if (!objfile->per_bfd->demangled_hash_languages.test (iter)) |
410 | continue; | |
411 | enum language lang = (enum language) iter; | |
412 | ||
b5ec771e PA |
413 | unsigned int hash |
414 | = (lookup_name.search_name_hash (lang) | |
415 | % MINIMAL_SYMBOL_HASH_SIZE); | |
416 | ||
417 | symbol_name_matcher_ftype *match | |
c9debfb9 AB |
418 | = language_def (lang)->get_symbol_name_matcher |
419 | (lookup_name); | |
b5ec771e PA |
420 | struct minimal_symbol **msymbol_demangled_hash |
421 | = objfile->per_bfd->msymbol_demangled_hash; | |
422 | ||
423 | lookup_minimal_symbol_demangled (lookup_name, sfile, objfile, | |
424 | msymbol_demangled_hash, | |
425 | hash, match, found); | |
426 | ||
427 | if (found.external_symbol.minsym != NULL) | |
428 | break; | |
9227b5eb | 429 | } |
c906108c SS |
430 | } |
431 | } | |
432 | } | |
71c25dea | 433 | |
c906108c | 434 | /* External symbols are best. */ |
b5ec771e | 435 | if (found.external_symbol.minsym != NULL) |
cc485e62 DE |
436 | { |
437 | if (symbol_lookup_debug) | |
438 | { | |
b5ec771e PA |
439 | minimal_symbol *minsym = found.external_symbol.minsym; |
440 | ||
6cb06a8c TT |
441 | gdb_printf (gdb_stdlog, |
442 | "lookup_minimal_symbol (...) = %s (external)\n", | |
443 | host_address_to_string (minsym)); | |
cc485e62 | 444 | } |
b5ec771e | 445 | return found.external_symbol; |
cc485e62 | 446 | } |
c906108c SS |
447 | |
448 | /* File-local symbols are next best. */ | |
b5ec771e | 449 | if (found.file_symbol.minsym != NULL) |
cc485e62 DE |
450 | { |
451 | if (symbol_lookup_debug) | |
452 | { | |
b5ec771e PA |
453 | minimal_symbol *minsym = found.file_symbol.minsym; |
454 | ||
6cb06a8c TT |
455 | gdb_printf (gdb_stdlog, |
456 | "lookup_minimal_symbol (...) = %s (file-local)\n", | |
457 | host_address_to_string (minsym)); | |
cc485e62 | 458 | } |
b5ec771e | 459 | return found.file_symbol; |
cc485e62 | 460 | } |
c906108c SS |
461 | |
462 | /* Symbols for shared library trampolines are next best. */ | |
b5ec771e | 463 | if (found.trampoline_symbol.minsym != NULL) |
cc485e62 | 464 | { |
b5ec771e PA |
465 | if (symbol_lookup_debug) |
466 | { | |
467 | minimal_symbol *minsym = found.trampoline_symbol.minsym; | |
468 | ||
6cb06a8c TT |
469 | gdb_printf (gdb_stdlog, |
470 | "lookup_minimal_symbol (...) = %s (trampoline)\n", | |
471 | host_address_to_string (minsym)); | |
b5ec771e PA |
472 | } |
473 | ||
474 | return found.trampoline_symbol; | |
cc485e62 | 475 | } |
b5ec771e PA |
476 | |
477 | /* Not found. */ | |
478 | if (symbol_lookup_debug) | |
6cb06a8c | 479 | gdb_printf (gdb_stdlog, "lookup_minimal_symbol (...) = NULL\n"); |
b5ec771e | 480 | return {}; |
7c7b6655 TT |
481 | } |
482 | ||
483 | /* See minsyms.h. */ | |
c906108c | 484 | |
7c7b6655 TT |
485 | struct bound_minimal_symbol |
486 | lookup_bound_minimal_symbol (const char *name) | |
487 | { | |
3b7344d5 | 488 | return lookup_minimal_symbol (name, NULL, NULL); |
c906108c SS |
489 | } |
490 | ||
268a13a5 | 491 | /* See gdbsupport/symbol.h. */ |
bd9269f7 GB |
492 | |
493 | int | |
494 | find_minimal_symbol_address (const char *name, CORE_ADDR *addr, | |
495 | struct objfile *objfile) | |
496 | { | |
497 | struct bound_minimal_symbol sym | |
498 | = lookup_minimal_symbol (name, NULL, objfile); | |
499 | ||
500 | if (sym.minsym != NULL) | |
4aeddc50 | 501 | *addr = sym.value_address (); |
bd9269f7 GB |
502 | |
503 | return sym.minsym == NULL; | |
504 | } | |
505 | ||
8825213e PA |
506 | /* Get the lookup name form best suitable for linkage name |
507 | matching. */ | |
508 | ||
509 | static const char * | |
510 | linkage_name_str (const lookup_name_info &lookup_name) | |
511 | { | |
512 | /* Unlike most languages (including C++), Ada uses the | |
513 | encoded/linkage name as the search name recorded in symbols. So | |
514 | if debugging in Ada mode, prefer the Ada-encoded name. This also | |
515 | makes Ada's verbatim match syntax ("<...>") work, because | |
516 | "lookup_name.name()" includes the "<>"s, while | |
517 | "lookup_name.ada().lookup_name()" is the encoded name with "<>"s | |
518 | stripped. */ | |
519 | if (current_language->la_language == language_ada) | |
520 | return lookup_name.ada ().lookup_name ().c_str (); | |
521 | ||
e0802d59 | 522 | return lookup_name.c_str (); |
8825213e PA |
523 | } |
524 | ||
b19686e0 | 525 | /* See minsyms.h. */ |
f8eba3c6 TT |
526 | |
527 | void | |
41c1efc6 TT |
528 | iterate_over_minimal_symbols |
529 | (struct objfile *objf, const lookup_name_info &lookup_name, | |
ca31ab1d | 530 | gdb::function_view<bool (struct minimal_symbol *)> callback) |
f8eba3c6 | 531 | { |
f8eba3c6 | 532 | /* The first pass is over the ordinary hash table. */ |
f8eba3c6 | 533 | { |
8825213e | 534 | const char *name = linkage_name_str (lookup_name); |
b5ec771e PA |
535 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
536 | auto *mangled_cmp | |
537 | = (case_sensitivity == case_sensitive_on | |
538 | ? strcmp | |
539 | : strcasecmp); | |
540 | ||
541 | for (minimal_symbol *iter = objf->per_bfd->msymbol_hash[hash]; | |
542 | iter != NULL; | |
543 | iter = iter->hash_next) | |
544 | { | |
c9d95fa3 | 545 | if (mangled_cmp (iter->linkage_name (), name) == 0) |
ca31ab1d PA |
546 | if (callback (iter)) |
547 | return; | |
b5ec771e | 548 | } |
f8eba3c6 TT |
549 | } |
550 | ||
b5ec771e PA |
551 | /* The second pass is over the demangled table. Once for each |
552 | language in the demangled hash names table (usually just zero or | |
553 | one). */ | |
1b7a07cb | 554 | for (unsigned liter = 0; liter < nr_languages; ++liter) |
f8eba3c6 | 555 | { |
1b7a07cb TT |
556 | if (!objf->per_bfd->demangled_hash_languages.test (liter)) |
557 | continue; | |
558 | ||
559 | enum language lang = (enum language) liter; | |
b5ec771e PA |
560 | const language_defn *lang_def = language_def (lang); |
561 | symbol_name_matcher_ftype *name_match | |
c9debfb9 | 562 | = lang_def->get_symbol_name_matcher (lookup_name); |
b5ec771e PA |
563 | |
564 | unsigned int hash | |
565 | = lookup_name.search_name_hash (lang) % MINIMAL_SYMBOL_HASH_SIZE; | |
566 | for (minimal_symbol *iter = objf->per_bfd->msymbol_demangled_hash[hash]; | |
567 | iter != NULL; | |
568 | iter = iter->demangled_hash_next) | |
c9d95fa3 | 569 | if (name_match (iter->search_name (), lookup_name, NULL)) |
ca31ab1d PA |
570 | if (callback (iter)) |
571 | return; | |
f8eba3c6 TT |
572 | } |
573 | } | |
574 | ||
b19686e0 | 575 | /* See minsyms.h. */ |
c5aa993b | 576 | |
4b610737 TT |
577 | bound_minimal_symbol |
578 | lookup_minimal_symbol_linkage (const char *name, struct objfile *objf) | |
579 | { | |
580 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
581 | ||
582 | for (objfile *objfile : objf->separate_debug_objfiles ()) | |
583 | { | |
584 | for (minimal_symbol *msymbol = objfile->per_bfd->msymbol_hash[hash]; | |
585 | msymbol != NULL; | |
586 | msymbol = msymbol->hash_next) | |
587 | { | |
c9d95fa3 | 588 | if (strcmp (msymbol->linkage_name (), name) == 0 |
60f62e2b SM |
589 | && (msymbol->type () == mst_data |
590 | || msymbol->type () == mst_bss)) | |
4b610737 TT |
591 | return {msymbol, objfile}; |
592 | } | |
593 | } | |
594 | ||
595 | return {}; | |
596 | } | |
597 | ||
598 | /* See minsyms.h. */ | |
599 | ||
3b7344d5 | 600 | struct bound_minimal_symbol |
5520a790 | 601 | lookup_minimal_symbol_text (const char *name, struct objfile *objf) |
c906108c | 602 | { |
c906108c | 603 | struct minimal_symbol *msymbol; |
f6b3ad54 TT |
604 | struct bound_minimal_symbol found_symbol; |
605 | struct bound_minimal_symbol found_file_symbol; | |
c906108c | 606 | |
72a5efb3 DJ |
607 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
608 | ||
bf227d61 | 609 | for (objfile *objfile : current_program_space->objfiles ()) |
c906108c | 610 | { |
bf227d61 TT |
611 | if (found_symbol.minsym != NULL) |
612 | break; | |
613 | ||
56e3f43c | 614 | if (objf == NULL || objf == objfile |
15d123c9 | 615 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 616 | { |
34643a32 | 617 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
3b7344d5 | 618 | msymbol != NULL && found_symbol.minsym == NULL; |
72a5efb3 | 619 | msymbol = msymbol->hash_next) |
c906108c | 620 | { |
c9d95fa3 | 621 | if (strcmp (msymbol->linkage_name (), name) == 0 && |
60f62e2b SM |
622 | (msymbol->type () == mst_text |
623 | || msymbol->type () == mst_text_gnu_ifunc | |
624 | || msymbol->type () == mst_file_text)) | |
c906108c | 625 | { |
60f62e2b | 626 | switch (msymbol->type ()) |
c906108c SS |
627 | { |
628 | case mst_file_text: | |
3b7344d5 TT |
629 | found_file_symbol.minsym = msymbol; |
630 | found_file_symbol.objfile = objfile; | |
c906108c SS |
631 | break; |
632 | default: | |
3b7344d5 TT |
633 | found_symbol.minsym = msymbol; |
634 | found_symbol.objfile = objfile; | |
c906108c SS |
635 | break; |
636 | } | |
637 | } | |
638 | } | |
639 | } | |
640 | } | |
641 | /* External symbols are best. */ | |
3b7344d5 | 642 | if (found_symbol.minsym) |
c906108c SS |
643 | return found_symbol; |
644 | ||
645 | /* File-local symbols are next best. */ | |
3b7344d5 | 646 | return found_file_symbol; |
c906108c SS |
647 | } |
648 | ||
b19686e0 | 649 | /* See minsyms.h. */ |
907fc202 UW |
650 | |
651 | struct minimal_symbol * | |
652 | lookup_minimal_symbol_by_pc_name (CORE_ADDR pc, const char *name, | |
653 | struct objfile *objf) | |
654 | { | |
907fc202 UW |
655 | struct minimal_symbol *msymbol; |
656 | ||
657 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
658 | ||
bf227d61 | 659 | for (objfile *objfile : current_program_space->objfiles ()) |
907fc202 UW |
660 | { |
661 | if (objf == NULL || objf == objfile | |
15d123c9 | 662 | || objf == objfile->separate_debug_objfile_backlink) |
907fc202 | 663 | { |
34643a32 | 664 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
907fc202 UW |
665 | msymbol != NULL; |
666 | msymbol = msymbol->hash_next) | |
667 | { | |
4aeddc50 | 668 | if (msymbol->value_address (objfile) == pc |
c9d95fa3 | 669 | && strcmp (msymbol->linkage_name (), name) == 0) |
907fc202 UW |
670 | return msymbol; |
671 | } | |
672 | } | |
673 | } | |
674 | ||
675 | return NULL; | |
676 | } | |
677 | ||
77e371c0 TT |
678 | /* A helper function that makes *PC section-relative. This searches |
679 | the sections of OBJFILE and if *PC is in a section, it subtracts | |
680 | the section offset and returns true. Otherwise it returns | |
681 | false. */ | |
682 | ||
683 | static int | |
684 | frob_address (struct objfile *objfile, CORE_ADDR *pc) | |
685 | { | |
686 | struct obj_section *iter; | |
687 | ||
688 | ALL_OBJFILE_OSECTIONS (objfile, iter) | |
689 | { | |
0c1bcd23 | 690 | if (*pc >= iter->addr () && *pc < iter->endaddr ()) |
77e371c0 | 691 | { |
0c1bcd23 | 692 | *pc -= iter->offset (); |
77e371c0 TT |
693 | return 1; |
694 | } | |
695 | } | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
6ae50267 PA |
700 | /* Helper for lookup_minimal_symbol_by_pc_section. Convert a |
701 | lookup_msym_prefer to a minimal_symbol_type. */ | |
702 | ||
703 | static minimal_symbol_type | |
704 | msym_prefer_to_msym_type (lookup_msym_prefer prefer) | |
705 | { | |
706 | switch (prefer) | |
707 | { | |
708 | case lookup_msym_prefer::TEXT: | |
709 | return mst_text; | |
710 | case lookup_msym_prefer::TRAMPOLINE: | |
711 | return mst_solib_trampoline; | |
712 | case lookup_msym_prefer::GNU_IFUNC: | |
713 | return mst_text_gnu_ifunc; | |
714 | } | |
715 | ||
716 | /* Assert here instead of in a default switch case above so that | |
717 | -Wswitch warns if a new enumerator is added. */ | |
718 | gdb_assert_not_reached ("unhandled lookup_msym_prefer"); | |
719 | } | |
720 | ||
733d0a67 AB |
721 | /* See minsyms.h. |
722 | ||
00878c6e PP |
723 | Note that we need to look through ALL the minimal symbol tables |
724 | before deciding on the symbol that comes closest to the specified PC. | |
725 | This is because objfiles can overlap, for example objfile A has .text | |
726 | at 0x100 and .data at 0x40000 and objfile B has .text at 0x234 and | |
733d0a67 | 727 | .data at 0x40048. */ |
2eaf8d2a | 728 | |
20944a6e PA |
729 | bound_minimal_symbol |
730 | lookup_minimal_symbol_by_pc_section (CORE_ADDR pc_in, struct obj_section *section, | |
733d0a67 AB |
731 | lookup_msym_prefer prefer, |
732 | bound_minimal_symbol *previous) | |
c906108c SS |
733 | { |
734 | int lo; | |
735 | int hi; | |
fe978cb0 | 736 | int newobj; |
c906108c SS |
737 | struct minimal_symbol *msymbol; |
738 | struct minimal_symbol *best_symbol = NULL; | |
7cbd4a93 TT |
739 | struct objfile *best_objfile = NULL; |
740 | struct bound_minimal_symbol result; | |
c906108c | 741 | |
733d0a67 AB |
742 | if (previous != nullptr) |
743 | { | |
744 | previous->minsym = nullptr; | |
745 | previous->objfile = nullptr; | |
746 | } | |
747 | ||
20944a6e PA |
748 | if (section == NULL) |
749 | { | |
750 | section = find_pc_section (pc_in); | |
751 | if (section == NULL) | |
752 | return {}; | |
753 | } | |
754 | ||
6ae50267 | 755 | minimal_symbol_type want_type = msym_prefer_to_msym_type (prefer); |
00878c6e PP |
756 | |
757 | /* We can not require the symbol found to be in section, because | |
96225718 DJ |
758 | e.g. IRIX 6.5 mdebug relies on this code returning an absolute |
759 | symbol - but find_pc_section won't return an absolute section and | |
760 | hence the code below would skip over absolute symbols. We can | |
761 | still take advantage of the call to find_pc_section, though - the | |
762 | object file still must match. In case we have separate debug | |
763 | files, search both the file and its separate debug file. There's | |
764 | no telling which one will have the minimal symbols. */ | |
765 | ||
00878c6e | 766 | gdb_assert (section != NULL); |
96225718 | 767 | |
bde09ab7 | 768 | for (objfile *objfile : section->objfile->separate_debug_objfiles ()) |
c906108c | 769 | { |
77e371c0 TT |
770 | CORE_ADDR pc = pc_in; |
771 | ||
741d7538 | 772 | /* If this objfile has a minimal symbol table, go search it |
dda83cd7 | 773 | using a binary search. */ |
c906108c | 774 | |
34643a32 | 775 | if (objfile->per_bfd->minimal_symbol_count > 0) |
c906108c | 776 | { |
29e8a844 DJ |
777 | int best_zero_sized = -1; |
778 | ||
dda83cd7 | 779 | msymbol = objfile->per_bfd->msymbols.get (); |
c906108c | 780 | lo = 0; |
34643a32 | 781 | hi = objfile->per_bfd->minimal_symbol_count - 1; |
c906108c SS |
782 | |
783 | /* This code assumes that the minimal symbols are sorted by | |
784 | ascending address values. If the pc value is greater than or | |
785 | equal to the first symbol's address, then some symbol in this | |
786 | minimal symbol table is a suitable candidate for being the | |
787 | "best" symbol. This includes the last real symbol, for cases | |
788 | where the pc value is larger than any address in this vector. | |
789 | ||
790 | By iterating until the address associated with the current | |
791 | hi index (the endpoint of the test interval) is less than | |
792 | or equal to the desired pc value, we accomplish two things: | |
793 | (1) the case where the pc value is larger than any minimal | |
794 | symbol address is trivially solved, (2) the address associated | |
30baf67b | 795 | with the hi index is always the one we want when the iteration |
c906108c SS |
796 | terminates. In essence, we are iterating the test interval |
797 | down until the pc value is pushed out of it from the high end. | |
798 | ||
025bb325 | 799 | Warning: this code is trickier than it would appear at first. */ |
c906108c | 800 | |
77e371c0 | 801 | if (frob_address (objfile, &pc) |
4aeddc50 | 802 | && pc >= msymbol[lo].value_raw_address ()) |
c906108c | 803 | { |
4aeddc50 | 804 | while (msymbol[hi].value_raw_address () > pc) |
c906108c | 805 | { |
025bb325 MS |
806 | /* pc is still strictly less than highest address. */ |
807 | /* Note "new" will always be >= lo. */ | |
fe978cb0 | 808 | newobj = (lo + hi) / 2; |
4aeddc50 | 809 | if ((msymbol[newobj].value_raw_address () >= pc) |
fe978cb0 | 810 | || (lo == newobj)) |
c906108c | 811 | { |
fe978cb0 | 812 | hi = newobj; |
c906108c SS |
813 | } |
814 | else | |
815 | { | |
fe978cb0 | 816 | lo = newobj; |
c906108c SS |
817 | } |
818 | } | |
819 | ||
820 | /* If we have multiple symbols at the same address, we want | |
dda83cd7 SM |
821 | hi to point to the last one. That way we can find the |
822 | right symbol if it has an index greater than hi. */ | |
34643a32 | 823 | while (hi < objfile->per_bfd->minimal_symbol_count - 1 |
4aeddc50 SM |
824 | && (msymbol[hi].value_raw_address () |
825 | == msymbol[hi + 1].value_raw_address ())) | |
c906108c SS |
826 | hi++; |
827 | ||
29e8a844 DJ |
828 | /* Skip various undesirable symbols. */ |
829 | while (hi >= 0) | |
830 | { | |
831 | /* Skip any absolute symbols. This is apparently | |
832 | what adb and dbx do, and is needed for the CM-5. | |
833 | There are two known possible problems: (1) on | |
834 | ELF, apparently end, edata, etc. are absolute. | |
835 | Not sure ignoring them here is a big deal, but if | |
836 | we want to use them, the fix would go in | |
837 | elfread.c. (2) I think shared library entry | |
838 | points on the NeXT are absolute. If we want | |
839 | special handling for this it probably should be | |
840 | triggered by a special mst_abs_or_lib or some | |
841 | such. */ | |
842 | ||
60f62e2b | 843 | if (msymbol[hi].type () == mst_abs) |
29e8a844 DJ |
844 | { |
845 | hi--; | |
846 | continue; | |
847 | } | |
848 | ||
849 | /* If SECTION was specified, skip any symbol from | |
850 | wrong section. */ | |
851 | if (section | |
852 | /* Some types of debug info, such as COFF, | |
853 | don't fill the bfd_section member, so don't | |
854 | throw away symbols on those platforms. */ | |
ebbc3a7d | 855 | && msymbol[hi].obj_section (objfile) != nullptr |
714835d5 | 856 | && (!matching_obj_sections |
ebbc3a7d | 857 | (msymbol[hi].obj_section (objfile), |
e27d198c | 858 | section))) |
29e8a844 DJ |
859 | { |
860 | hi--; | |
861 | continue; | |
862 | } | |
863 | ||
2eaf8d2a DJ |
864 | /* If we are looking for a trampoline and this is a |
865 | text symbol, or the other way around, check the | |
177b42fe | 866 | preceding symbol too. If they are otherwise |
2eaf8d2a DJ |
867 | identical prefer that one. */ |
868 | if (hi > 0 | |
60f62e2b SM |
869 | && msymbol[hi].type () != want_type |
870 | && msymbol[hi - 1].type () == want_type | |
5bbfd12d | 871 | && (msymbol[hi].size () == msymbol[hi - 1].size ()) |
4aeddc50 SM |
872 | && (msymbol[hi].value_raw_address () |
873 | == msymbol[hi - 1].value_raw_address ()) | |
ebbc3a7d AB |
874 | && (msymbol[hi].obj_section (objfile) |
875 | == msymbol[hi - 1].obj_section (objfile))) | |
2eaf8d2a DJ |
876 | { |
877 | hi--; | |
878 | continue; | |
879 | } | |
880 | ||
29e8a844 DJ |
881 | /* If the minimal symbol has a zero size, save it |
882 | but keep scanning backwards looking for one with | |
883 | a non-zero size. A zero size may mean that the | |
884 | symbol isn't an object or function (e.g. a | |
885 | label), or it may just mean that the size was not | |
886 | specified. */ | |
5bbfd12d | 887 | if (msymbol[hi].size () == 0) |
29e8a844 | 888 | { |
5506f9f6 KB |
889 | if (best_zero_sized == -1) |
890 | best_zero_sized = hi; | |
29e8a844 DJ |
891 | hi--; |
892 | continue; | |
893 | } | |
894 | ||
f7a6bb70 DJ |
895 | /* If we are past the end of the current symbol, try |
896 | the previous symbol if it has a larger overlapping | |
897 | size. This happens on i686-pc-linux-gnu with glibc; | |
898 | the nocancel variants of system calls are inside | |
899 | the cancellable variants, but both have sizes. */ | |
900 | if (hi > 0 | |
5bbfd12d | 901 | && msymbol[hi].size () != 0 |
4aeddc50 | 902 | && pc >= (msymbol[hi].value_raw_address () |
5bbfd12d | 903 | + msymbol[hi].size ()) |
4aeddc50 | 904 | && pc < (msymbol[hi - 1].value_raw_address () |
5bbfd12d | 905 | + msymbol[hi - 1].size ())) |
f7a6bb70 DJ |
906 | { |
907 | hi--; | |
908 | continue; | |
909 | } | |
910 | ||
29e8a844 DJ |
911 | /* Otherwise, this symbol must be as good as we're going |
912 | to get. */ | |
913 | break; | |
914 | } | |
915 | ||
916 | /* If HI has a zero size, and best_zero_sized is set, | |
917 | then we had two or more zero-sized symbols; prefer | |
918 | the first one we found (which may have a higher | |
919 | address). Also, if we ran off the end, be sure | |
920 | to back up. */ | |
921 | if (best_zero_sized != -1 | |
5bbfd12d | 922 | && (hi < 0 || msymbol[hi].size () == 0)) |
29e8a844 DJ |
923 | hi = best_zero_sized; |
924 | ||
925 | /* If the minimal symbol has a non-zero size, and this | |
926 | PC appears to be outside the symbol's contents, then | |
927 | refuse to use this symbol. If we found a zero-sized | |
928 | symbol with an address greater than this symbol's, | |
929 | use that instead. We assume that if symbols have | |
930 | specified sizes, they do not overlap. */ | |
931 | ||
932 | if (hi >= 0 | |
5bbfd12d | 933 | && msymbol[hi].size () != 0 |
4aeddc50 | 934 | && pc >= (msymbol[hi].value_raw_address () |
5bbfd12d | 935 | + msymbol[hi].size ())) |
29e8a844 DJ |
936 | { |
937 | if (best_zero_sized != -1) | |
938 | hi = best_zero_sized; | |
939 | else | |
733d0a67 AB |
940 | { |
941 | /* If needed record this symbol as the closest | |
942 | previous symbol. */ | |
943 | if (previous != nullptr) | |
944 | { | |
945 | if (previous->minsym == nullptr | |
4aeddc50 SM |
946 | || (msymbol[hi].value_raw_address () |
947 | > previous->minsym->value_raw_address ())) | |
733d0a67 AB |
948 | { |
949 | previous->minsym = &msymbol[hi]; | |
950 | previous->objfile = objfile; | |
951 | } | |
952 | } | |
953 | /* Go on to the next object file. */ | |
954 | continue; | |
955 | } | |
29e8a844 DJ |
956 | } |
957 | ||
c906108c | 958 | /* The minimal symbol indexed by hi now is the best one in this |
dda83cd7 SM |
959 | objfile's minimal symbol table. See if it is the best one |
960 | overall. */ | |
c906108c | 961 | |
c906108c SS |
962 | if (hi >= 0 |
963 | && ((best_symbol == NULL) || | |
4aeddc50 SM |
964 | (best_symbol->value_raw_address () < |
965 | msymbol[hi].value_raw_address ()))) | |
c906108c SS |
966 | { |
967 | best_symbol = &msymbol[hi]; | |
7cbd4a93 | 968 | best_objfile = objfile; |
c906108c SS |
969 | } |
970 | } | |
971 | } | |
972 | } | |
7cbd4a93 TT |
973 | |
974 | result.minsym = best_symbol; | |
975 | result.objfile = best_objfile; | |
976 | return result; | |
c906108c SS |
977 | } |
978 | ||
b19686e0 | 979 | /* See minsyms.h. */ |
c906108c | 980 | |
7cbd4a93 | 981 | struct bound_minimal_symbol |
fba45db2 | 982 | lookup_minimal_symbol_by_pc (CORE_ADDR pc) |
c906108c | 983 | { |
20944a6e | 984 | return lookup_minimal_symbol_by_pc_section (pc, NULL); |
c906108c | 985 | } |
0d5392b8 | 986 | |
0875794a JK |
987 | /* Return non-zero iff PC is in an STT_GNU_IFUNC function resolver. */ |
988 | ||
ececd218 | 989 | bool |
0875794a JK |
990 | in_gnu_ifunc_stub (CORE_ADDR pc) |
991 | { | |
20944a6e PA |
992 | bound_minimal_symbol msymbol |
993 | = lookup_minimal_symbol_by_pc_section (pc, NULL, | |
994 | lookup_msym_prefer::GNU_IFUNC); | |
60f62e2b | 995 | return msymbol.minsym && msymbol.minsym->type () == mst_text_gnu_ifunc; |
0875794a JK |
996 | } |
997 | ||
07be84bf JK |
998 | /* See elf_gnu_ifunc_resolve_addr for its real implementation. */ |
999 | ||
1000 | static CORE_ADDR | |
1001 | stub_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1002 | { | |
1003 | error (_("GDB cannot resolve STT_GNU_IFUNC symbol at address %s without " | |
1004 | "the ELF support compiled in."), | |
1005 | paddress (gdbarch, pc)); | |
1006 | } | |
1007 | ||
1008 | /* See elf_gnu_ifunc_resolve_name for its real implementation. */ | |
1009 | ||
ececd218 | 1010 | static bool |
07be84bf JK |
1011 | stub_gnu_ifunc_resolve_name (const char *function_name, |
1012 | CORE_ADDR *function_address_p) | |
1013 | { | |
1014 | error (_("GDB cannot resolve STT_GNU_IFUNC symbol \"%s\" without " | |
1015 | "the ELF support compiled in."), | |
1016 | function_name); | |
1017 | } | |
1018 | ||
0e30163f JK |
1019 | /* See elf_gnu_ifunc_resolver_stop for its real implementation. */ |
1020 | ||
1021 | static void | |
74421c0b | 1022 | stub_gnu_ifunc_resolver_stop (code_breakpoint *b) |
0e30163f JK |
1023 | { |
1024 | internal_error (__FILE__, __LINE__, | |
1025 | _("elf_gnu_ifunc_resolver_stop cannot be reached.")); | |
1026 | } | |
1027 | ||
1028 | /* See elf_gnu_ifunc_resolver_return_stop for its real implementation. */ | |
1029 | ||
1030 | static void | |
74421c0b | 1031 | stub_gnu_ifunc_resolver_return_stop (code_breakpoint *b) |
0e30163f JK |
1032 | { |
1033 | internal_error (__FILE__, __LINE__, | |
1034 | _("elf_gnu_ifunc_resolver_return_stop cannot be reached.")); | |
1035 | } | |
1036 | ||
07be84bf JK |
1037 | /* See elf_gnu_ifunc_fns for its real implementation. */ |
1038 | ||
1039 | static const struct gnu_ifunc_fns stub_gnu_ifunc_fns = | |
1040 | { | |
1041 | stub_gnu_ifunc_resolve_addr, | |
1042 | stub_gnu_ifunc_resolve_name, | |
0e30163f JK |
1043 | stub_gnu_ifunc_resolver_stop, |
1044 | stub_gnu_ifunc_resolver_return_stop, | |
07be84bf JK |
1045 | }; |
1046 | ||
1047 | /* A placeholder for &elf_gnu_ifunc_fns. */ | |
1048 | ||
1049 | const struct gnu_ifunc_fns *gnu_ifunc_fns_p = &stub_gnu_ifunc_fns; | |
1050 | ||
c906108c | 1051 | \f |
c5aa993b | 1052 | |
025bb325 | 1053 | /* Return leading symbol character for a BFD. If BFD is NULL, |
c906108c SS |
1054 | return the leading symbol character from the main objfile. */ |
1055 | ||
c906108c | 1056 | static int |
fba45db2 | 1057 | get_symbol_leading_char (bfd *abfd) |
c906108c SS |
1058 | { |
1059 | if (abfd != NULL) | |
1060 | return bfd_get_symbol_leading_char (abfd); | |
a42d7dd8 TT |
1061 | if (current_program_space->symfile_object_file != NULL) |
1062 | { | |
1063 | objfile *objf = current_program_space->symfile_object_file; | |
1064 | if (objf->obfd != NULL) | |
1065 | return bfd_get_symbol_leading_char (objf->obfd); | |
1066 | } | |
c906108c SS |
1067 | return 0; |
1068 | } | |
1069 | ||
b19686e0 | 1070 | /* See minsyms.h. */ |
c906108c | 1071 | |
d25e8719 | 1072 | minimal_symbol_reader::minimal_symbol_reader (struct objfile *obj) |
8dddcb8f TT |
1073 | : m_objfile (obj), |
1074 | m_msym_bunch (NULL), | |
1075 | /* Note that presetting m_msym_bunch_index to BUNCH_SIZE causes the | |
b19686e0 TT |
1076 | first call to save a minimal symbol to allocate the memory for |
1077 | the first bunch. */ | |
8dddcb8f TT |
1078 | m_msym_bunch_index (BUNCH_SIZE), |
1079 | m_msym_count (0) | |
1080 | { | |
c906108c SS |
1081 | } |
1082 | ||
873a915e TT |
1083 | /* Discard the currently collected minimal symbols, if any. If we wish |
1084 | to save them for later use, we must have already copied them somewhere | |
79e7ae11 | 1085 | else before calling this function. */ |
873a915e TT |
1086 | |
1087 | minimal_symbol_reader::~minimal_symbol_reader () | |
1088 | { | |
1089 | struct msym_bunch *next; | |
1090 | ||
8dddcb8f | 1091 | while (m_msym_bunch != NULL) |
873a915e | 1092 | { |
8dddcb8f TT |
1093 | next = m_msym_bunch->next; |
1094 | xfree (m_msym_bunch); | |
1095 | m_msym_bunch = next; | |
873a915e TT |
1096 | } |
1097 | } | |
1098 | ||
b19686e0 TT |
1099 | /* See minsyms.h. */ |
1100 | ||
c906108c | 1101 | void |
8dddcb8f | 1102 | minimal_symbol_reader::record (const char *name, CORE_ADDR address, |
ce6c454e | 1103 | enum minimal_symbol_type ms_type) |
c906108c SS |
1104 | { |
1105 | int section; | |
1106 | ||
1107 | switch (ms_type) | |
1108 | { | |
1109 | case mst_text: | |
0875794a | 1110 | case mst_text_gnu_ifunc: |
c906108c SS |
1111 | case mst_file_text: |
1112 | case mst_solib_trampoline: | |
8dddcb8f | 1113 | section = SECT_OFF_TEXT (m_objfile); |
c906108c SS |
1114 | break; |
1115 | case mst_data: | |
f50776aa | 1116 | case mst_data_gnu_ifunc: |
c906108c | 1117 | case mst_file_data: |
8dddcb8f | 1118 | section = SECT_OFF_DATA (m_objfile); |
c906108c SS |
1119 | break; |
1120 | case mst_bss: | |
1121 | case mst_file_bss: | |
8dddcb8f | 1122 | section = SECT_OFF_BSS (m_objfile); |
c906108c SS |
1123 | break; |
1124 | default: | |
1125 | section = -1; | |
1126 | } | |
1127 | ||
8dddcb8f | 1128 | record_with_info (name, address, ms_type, section); |
c906108c SS |
1129 | } |
1130 | ||
e08b849e SM |
1131 | /* Convert an enumerator of type minimal_symbol_type to its string |
1132 | representation. */ | |
1133 | ||
1134 | static const char * | |
1135 | mst_str (minimal_symbol_type t) | |
1136 | { | |
1137 | #define MST_TO_STR(x) case x: return #x; | |
1138 | switch (t) | |
1139 | { | |
1140 | MST_TO_STR (mst_unknown); | |
1141 | MST_TO_STR (mst_text); | |
1142 | MST_TO_STR (mst_text_gnu_ifunc); | |
1143 | MST_TO_STR (mst_slot_got_plt); | |
1144 | MST_TO_STR (mst_data); | |
1145 | MST_TO_STR (mst_bss); | |
1146 | MST_TO_STR (mst_abs); | |
1147 | MST_TO_STR (mst_solib_trampoline); | |
1148 | MST_TO_STR (mst_file_text); | |
1149 | MST_TO_STR (mst_file_data); | |
1150 | MST_TO_STR (mst_file_bss); | |
1151 | ||
1152 | default: | |
1153 | return "mst_???"; | |
1154 | } | |
1155 | #undef MST_TO_STR | |
1156 | } | |
1157 | ||
b19686e0 | 1158 | /* See minsyms.h. */ |
c906108c SS |
1159 | |
1160 | struct minimal_symbol * | |
31edb802 | 1161 | minimal_symbol_reader::record_full (gdb::string_view name, |
ce6c454e TT |
1162 | bool copy_name, CORE_ADDR address, |
1163 | enum minimal_symbol_type ms_type, | |
1164 | int section) | |
c906108c | 1165 | { |
fe978cb0 | 1166 | struct msym_bunch *newobj; |
52f0bd74 | 1167 | struct minimal_symbol *msymbol; |
c906108c | 1168 | |
66337bb1 CV |
1169 | /* Don't put gcc_compiled, __gnu_compiled_cplus, and friends into |
1170 | the minimal symbols, because if there is also another symbol | |
1171 | at the same address (e.g. the first function of the file), | |
1172 | lookup_minimal_symbol_by_pc would have no way of getting the | |
1173 | right one. */ | |
1174 | if (ms_type == mst_file_text && name[0] == 'g' | |
31edb802 CB |
1175 | && (name == GCC_COMPILED_FLAG_SYMBOL |
1176 | || name == GCC2_COMPILED_FLAG_SYMBOL)) | |
66337bb1 CV |
1177 | return (NULL); |
1178 | ||
1179 | /* It's safe to strip the leading char here once, since the name | |
025bb325 | 1180 | is also stored stripped in the minimal symbol table. */ |
8dddcb8f | 1181 | if (name[0] == get_symbol_leading_char (m_objfile->obfd)) |
31edb802 | 1182 | name = name.substr (1); |
66337bb1 | 1183 | |
61012eef | 1184 | if (ms_type == mst_file_text && startswith (name, "__gnu_compiled")) |
66337bb1 | 1185 | return (NULL); |
c906108c | 1186 | |
2ab317fb SM |
1187 | symtab_create_debug_printf_v ("recording minsym: %-21s %18s %4d %.*s", |
1188 | mst_str (ms_type), hex_string (address), section, | |
1189 | (int) name.size (), name.data ()); | |
e08b849e | 1190 | |
8dddcb8f | 1191 | if (m_msym_bunch_index == BUNCH_SIZE) |
c906108c | 1192 | { |
fe978cb0 | 1193 | newobj = XCNEW (struct msym_bunch); |
8dddcb8f TT |
1194 | m_msym_bunch_index = 0; |
1195 | newobj->next = m_msym_bunch; | |
1196 | m_msym_bunch = newobj; | |
c906108c | 1197 | } |
8dddcb8f | 1198 | msymbol = &m_msym_bunch->contents[m_msym_bunch_index]; |
d3ecddab CB |
1199 | msymbol->set_language (language_auto, |
1200 | &m_objfile->per_bfd->storage_obstack); | |
5a79c107 TT |
1201 | |
1202 | if (copy_name) | |
4d4eaa30 CB |
1203 | msymbol->m_name = obstack_strndup (&m_objfile->per_bfd->storage_obstack, |
1204 | name.data (), name.size ()); | |
5a79c107 | 1205 | else |
4d4eaa30 | 1206 | msymbol->m_name = name.data (); |
2de7ced7 | 1207 | |
4aeddc50 | 1208 | msymbol->set_value_address (address); |
a52d653e | 1209 | msymbol->set_section_index (section); |
714835d5 | 1210 | |
60f62e2b | 1211 | msymbol->set_type (ms_type); |
9227b5eb | 1212 | |
34643a32 TT |
1213 | /* If we already read minimal symbols for this objfile, then don't |
1214 | ever allocate a new one. */ | |
8dddcb8f | 1215 | if (!m_objfile->per_bfd->minsyms_read) |
5f6cac40 | 1216 | { |
8dddcb8f TT |
1217 | m_msym_bunch_index++; |
1218 | m_objfile->per_bfd->n_minsyms++; | |
5f6cac40 | 1219 | } |
8dddcb8f | 1220 | m_msym_count++; |
c906108c SS |
1221 | return msymbol; |
1222 | } | |
1223 | ||
6fb08628 CB |
1224 | /* Compare two minimal symbols by address and return true if FN1's address |
1225 | is less than FN2's, so that we sort into unsigned numeric order. | |
c906108c SS |
1226 | Within groups with the same address, sort by name. */ |
1227 | ||
6fb08628 CB |
1228 | static inline bool |
1229 | minimal_symbol_is_less_than (const minimal_symbol &fn1, | |
1230 | const minimal_symbol &fn2) | |
c906108c | 1231 | { |
4aeddc50 | 1232 | if ((&fn1)->value_raw_address () < (&fn2)->value_raw_address ()) |
c906108c | 1233 | { |
6fb08628 | 1234 | return true; /* addr 1 is less than addr 2. */ |
c906108c | 1235 | } |
4aeddc50 | 1236 | else if ((&fn1)->value_raw_address () > (&fn2)->value_raw_address ()) |
c906108c | 1237 | { |
6fb08628 | 1238 | return false; /* addr 1 is greater than addr 2. */ |
c906108c | 1239 | } |
c5aa993b JM |
1240 | else |
1241 | /* addrs are equal: sort by name */ | |
c906108c | 1242 | { |
c9d95fa3 CB |
1243 | const char *name1 = fn1.linkage_name (); |
1244 | const char *name2 = fn2.linkage_name (); | |
c906108c SS |
1245 | |
1246 | if (name1 && name2) /* both have names */ | |
6fb08628 | 1247 | return strcmp (name1, name2) < 0; |
c906108c | 1248 | else if (name2) |
6fb08628 | 1249 | return true; /* fn1 has no name, so it is "less". */ |
025bb325 | 1250 | else if (name1) /* fn2 has no name, so it is "less". */ |
6fb08628 | 1251 | return false; |
c906108c | 1252 | else |
6fb08628 | 1253 | return false; /* Neither has a name, so they're equal. */ |
c906108c SS |
1254 | } |
1255 | } | |
1256 | ||
c906108c SS |
1257 | /* Compact duplicate entries out of a minimal symbol table by walking |
1258 | through the table and compacting out entries with duplicate addresses | |
1259 | and matching names. Return the number of entries remaining. | |
1260 | ||
1261 | On entry, the table resides between msymbol[0] and msymbol[mcount]. | |
1262 | On exit, it resides between msymbol[0] and msymbol[result_count]. | |
1263 | ||
1264 | When files contain multiple sources of symbol information, it is | |
1265 | possible for the minimal symbol table to contain many duplicate entries. | |
1266 | As an example, SVR4 systems use ELF formatted object files, which | |
1267 | usually contain at least two different types of symbol tables (a | |
1268 | standard ELF one and a smaller dynamic linking table), as well as | |
1269 | DWARF debugging information for files compiled with -g. | |
1270 | ||
1271 | Without compacting, the minimal symbol table for gdb itself contains | |
1272 | over a 1000 duplicates, about a third of the total table size. Aside | |
1273 | from the potential trap of not noticing that two successive entries | |
1274 | identify the same location, this duplication impacts the time required | |
1275 | to linearly scan the table, which is done in a number of places. So we | |
1276 | just do one linear scan here and toss out the duplicates. | |
1277 | ||
c906108c SS |
1278 | Since the different sources of information for each symbol may |
1279 | have different levels of "completeness", we may have duplicates | |
1280 | that have one entry with type "mst_unknown" and the other with a | |
1281 | known type. So if the one we are leaving alone has type mst_unknown, | |
1282 | overwrite its type with the type from the one we are compacting out. */ | |
1283 | ||
1284 | static int | |
fba45db2 KB |
1285 | compact_minimal_symbols (struct minimal_symbol *msymbol, int mcount, |
1286 | struct objfile *objfile) | |
c906108c SS |
1287 | { |
1288 | struct minimal_symbol *copyfrom; | |
1289 | struct minimal_symbol *copyto; | |
1290 | ||
1291 | if (mcount > 0) | |
1292 | { | |
1293 | copyfrom = copyto = msymbol; | |
1294 | while (copyfrom < msymbol + mcount - 1) | |
1295 | { | |
4aeddc50 SM |
1296 | if (copyfrom->value_raw_address () |
1297 | == (copyfrom + 1)->value_raw_address () | |
a52d653e AB |
1298 | && (copyfrom->section_index () |
1299 | == (copyfrom + 1)->section_index ()) | |
c9d95fa3 CB |
1300 | && strcmp (copyfrom->linkage_name (), |
1301 | (copyfrom + 1)->linkage_name ()) == 0) | |
c906108c | 1302 | { |
60f62e2b SM |
1303 | if ((copyfrom + 1)->type () == mst_unknown) |
1304 | (copyfrom + 1)->set_type (copyfrom->type ()); | |
1305 | ||
c906108c SS |
1306 | copyfrom++; |
1307 | } | |
1308 | else | |
afbb8d7a | 1309 | *copyto++ = *copyfrom++; |
c906108c SS |
1310 | } |
1311 | *copyto++ = *copyfrom++; | |
1312 | mcount = copyto - msymbol; | |
1313 | } | |
1314 | return (mcount); | |
1315 | } | |
1316 | ||
808590ec CB |
1317 | static void |
1318 | clear_minimal_symbol_hash_tables (struct objfile *objfile) | |
1319 | { | |
1320 | for (size_t i = 0; i < MINIMAL_SYMBOL_HASH_SIZE; i++) | |
1321 | { | |
1322 | objfile->per_bfd->msymbol_hash[i] = 0; | |
1323 | objfile->per_bfd->msymbol_demangled_hash[i] = 0; | |
1324 | } | |
1325 | } | |
1326 | ||
e76b2246 CB |
1327 | /* This struct is used to store values we compute for msymbols on the |
1328 | background threads but don't need to keep around long term. */ | |
1329 | struct computed_hash_values | |
1330 | { | |
1331 | /* Length of the linkage_name of the symbol. */ | |
1332 | size_t name_length; | |
1333 | /* Hash code (using fast_hash) of the linkage_name. */ | |
1334 | hashval_t mangled_name_hash; | |
f29d7f6b CB |
1335 | /* The msymbol_hash of the linkage_name. */ |
1336 | unsigned int minsym_hash; | |
1337 | /* The msymbol_hash of the search_name. */ | |
1338 | unsigned int minsym_demangled_hash; | |
e76b2246 CB |
1339 | }; |
1340 | ||
afbb8d7a KB |
1341 | /* Build (or rebuild) the minimal symbol hash tables. This is necessary |
1342 | after compacting or sorting the table since the entries move around | |
025bb325 | 1343 | thus causing the internal minimal_symbol pointers to become jumbled. */ |
afbb8d7a KB |
1344 | |
1345 | static void | |
f29d7f6b CB |
1346 | build_minimal_symbol_hash_tables |
1347 | (struct objfile *objfile, | |
1348 | const std::vector<computed_hash_values>& hash_values) | |
afbb8d7a KB |
1349 | { |
1350 | int i; | |
1351 | struct minimal_symbol *msym; | |
1352 | ||
808590ec | 1353 | /* (Re)insert the actual entries. */ |
f29d7f6b CB |
1354 | int mcount = objfile->per_bfd->minimal_symbol_count; |
1355 | for ((i = 0, | |
042d75e4 | 1356 | msym = objfile->per_bfd->msymbols.get ()); |
f29d7f6b CB |
1357 | i < mcount; |
1358 | i++, msym++) | |
afbb8d7a KB |
1359 | { |
1360 | msym->hash_next = 0; | |
f29d7f6b CB |
1361 | add_minsym_to_hash_table (msym, objfile->per_bfd->msymbol_hash, |
1362 | hash_values[i].minsym_hash); | |
afbb8d7a KB |
1363 | |
1364 | msym->demangled_hash_next = 0; | |
c9d95fa3 | 1365 | if (msym->search_name () != msym->linkage_name ()) |
f29d7f6b CB |
1366 | add_minsym_to_demangled_hash_table |
1367 | (msym, objfile, hash_values[i].minsym_demangled_hash); | |
afbb8d7a KB |
1368 | } |
1369 | } | |
1370 | ||
c906108c SS |
1371 | /* Add the minimal symbols in the existing bunches to the objfile's official |
1372 | minimal symbol table. In most cases there is no minimal symbol table yet | |
1373 | for this objfile, and the existing bunches are used to create one. Once | |
1374 | in a while (for shared libraries for example), we add symbols (e.g. common | |
79e7ae11 | 1375 | symbols) to an existing objfile. */ |
c906108c SS |
1376 | |
1377 | void | |
d25e8719 | 1378 | minimal_symbol_reader::install () |
c906108c | 1379 | { |
52f0bd74 AC |
1380 | int mcount; |
1381 | struct msym_bunch *bunch; | |
1382 | struct minimal_symbol *msymbols; | |
c906108c | 1383 | int alloc_count; |
c906108c | 1384 | |
d25e8719 | 1385 | if (m_objfile->per_bfd->minsyms_read) |
34643a32 TT |
1386 | return; |
1387 | ||
8dddcb8f | 1388 | if (m_msym_count > 0) |
c906108c | 1389 | { |
2ab317fb SM |
1390 | symtab_create_debug_printf ("installing %d minimal symbols of objfile %s", |
1391 | m_msym_count, objfile_name (m_objfile)); | |
45cfd468 | 1392 | |
79e7ae11 | 1393 | /* Allocate enough space, into which we will gather the bunches |
dda83cd7 SM |
1394 | of new and existing minimal symbols, sort them, and then |
1395 | compact out the duplicate entries. Once we have a final | |
1396 | table, we will give back the excess space. */ | |
c906108c | 1397 | |
741d7538 | 1398 | alloc_count = m_msym_count + m_objfile->per_bfd->minimal_symbol_count; |
042d75e4 TT |
1399 | gdb::unique_xmalloc_ptr<minimal_symbol> |
1400 | msym_holder (XNEWVEC (minimal_symbol, alloc_count)); | |
1401 | msymbols = msym_holder.get (); | |
c906108c SS |
1402 | |
1403 | /* Copy in the existing minimal symbols, if there are any. */ | |
1404 | ||
d25e8719 | 1405 | if (m_objfile->per_bfd->minimal_symbol_count) |
042d75e4 TT |
1406 | memcpy (msymbols, m_objfile->per_bfd->msymbols.get (), |
1407 | m_objfile->per_bfd->minimal_symbol_count | |
1408 | * sizeof (struct minimal_symbol)); | |
c906108c SS |
1409 | |
1410 | /* Walk through the list of minimal symbol bunches, adding each symbol | |
dda83cd7 SM |
1411 | to the new contiguous array of symbols. Note that we start with the |
1412 | current, possibly partially filled bunch (thus we use the current | |
1413 | msym_bunch_index for the first bunch we copy over), and thereafter | |
1414 | each bunch is full. */ | |
c5aa993b | 1415 | |
d25e8719 | 1416 | mcount = m_objfile->per_bfd->minimal_symbol_count; |
c5aa993b | 1417 | |
8dddcb8f | 1418 | for (bunch = m_msym_bunch; bunch != NULL; bunch = bunch->next) |
c906108c | 1419 | { |
0de2420c TT |
1420 | memcpy (&msymbols[mcount], &bunch->contents[0], |
1421 | m_msym_bunch_index * sizeof (struct minimal_symbol)); | |
1422 | mcount += m_msym_bunch_index; | |
8dddcb8f | 1423 | m_msym_bunch_index = BUNCH_SIZE; |
c906108c SS |
1424 | } |
1425 | ||
1426 | /* Sort the minimal symbols by address. */ | |
c5aa993b | 1427 | |
6fb08628 | 1428 | std::sort (msymbols, msymbols + mcount, minimal_symbol_is_less_than); |
c5aa993b | 1429 | |
c906108c | 1430 | /* Compact out any duplicates, and free up whatever space we are |
dda83cd7 | 1431 | no longer using. */ |
c5aa993b | 1432 | |
d25e8719 | 1433 | mcount = compact_minimal_symbols (msymbols, mcount, m_objfile); |
042d75e4 TT |
1434 | msym_holder.reset (XRESIZEVEC (struct minimal_symbol, |
1435 | msym_holder.release (), | |
1436 | mcount)); | |
c906108c | 1437 | |
c906108c | 1438 | /* Attach the minimal symbol table to the specified objfile. |
dda83cd7 SM |
1439 | The strings themselves are also located in the storage_obstack |
1440 | of this objfile. */ | |
c906108c | 1441 | |
808590ec CB |
1442 | if (m_objfile->per_bfd->minimal_symbol_count != 0) |
1443 | clear_minimal_symbol_hash_tables (m_objfile); | |
1444 | ||
d25e8719 | 1445 | m_objfile->per_bfd->minimal_symbol_count = mcount; |
042d75e4 | 1446 | m_objfile->per_bfd->msymbols = std::move (msym_holder); |
c906108c | 1447 | |
d55c9a68 TT |
1448 | #if CXX_STD_THREAD |
1449 | /* Mutex that is used when modifying or accessing the demangled | |
1450 | hash table. */ | |
1451 | std::mutex demangled_mutex; | |
1452 | #endif | |
1453 | ||
e76b2246 CB |
1454 | std::vector<computed_hash_values> hash_values (mcount); |
1455 | ||
5a79c107 | 1456 | msymbols = m_objfile->per_bfd->msymbols.get (); |
82d734f7 TT |
1457 | /* Arbitrarily require at least 10 elements in a thread. */ |
1458 | gdb::parallel_for_each (10, &msymbols[0], &msymbols[mcount], | |
d55c9a68 TT |
1459 | [&] (minimal_symbol *start, minimal_symbol *end) |
1460 | { | |
1461 | for (minimal_symbol *msym = start; msym < end; ++msym) | |
1462 | { | |
e76b2246 | 1463 | size_t idx = msym - msymbols; |
4d4eaa30 | 1464 | hash_values[idx].name_length = strlen (msym->linkage_name ()); |
d55c9a68 TT |
1465 | if (!msym->name_set) |
1466 | { | |
4d4eaa30 | 1467 | /* This will be freed later, by compute_and_set_names. */ |
3456e70c | 1468 | gdb::unique_xmalloc_ptr<char> demangled_name |
4d4eaa30 | 1469 | = symbol_find_demangled_name (msym, msym->linkage_name ()); |
ff985671 | 1470 | msym->set_demangled_name |
3456e70c TT |
1471 | (demangled_name.release (), |
1472 | &m_objfile->per_bfd->storage_obstack); | |
d55c9a68 TT |
1473 | msym->name_set = 1; |
1474 | } | |
62e77f56 | 1475 | /* This mangled_name_hash computation has to be outside of |
4d4eaa30 | 1476 | the name_set check, or compute_and_set_names below will |
62e77f56 CB |
1477 | be called with an invalid hash value. */ |
1478 | hash_values[idx].mangled_name_hash | |
4d4eaa30 CB |
1479 | = fast_hash (msym->linkage_name (), |
1480 | hash_values[idx].name_length); | |
f29d7f6b CB |
1481 | hash_values[idx].minsym_hash |
1482 | = msymbol_hash (msym->linkage_name ()); | |
1483 | /* We only use this hash code if the search name differs | |
1484 | from the linkage name. See the code in | |
1485 | build_minimal_symbol_hash_tables. */ | |
1486 | if (msym->search_name () != msym->linkage_name ()) | |
1487 | hash_values[idx].minsym_demangled_hash | |
c1b5c1eb | 1488 | = search_name_hash (msym->language (), msym->search_name ()); |
d55c9a68 TT |
1489 | } |
1490 | { | |
1491 | /* To limit how long we hold the lock, we only acquire it here | |
dda83cd7 | 1492 | and not while we demangle the names above. */ |
d55c9a68 TT |
1493 | #if CXX_STD_THREAD |
1494 | std::lock_guard<std::mutex> guard (demangled_mutex); | |
1495 | #endif | |
1496 | for (minimal_symbol *msym = start; msym < end; ++msym) | |
1497 | { | |
e76b2246 | 1498 | size_t idx = msym - msymbols; |
4d4eaa30 CB |
1499 | msym->compute_and_set_names |
1500 | (gdb::string_view (msym->linkage_name (), | |
1501 | hash_values[idx].name_length), | |
e76b2246 CB |
1502 | false, |
1503 | m_objfile->per_bfd, | |
1504 | hash_values[idx].mangled_name_hash); | |
d55c9a68 TT |
1505 | } |
1506 | } | |
1507 | }); | |
5a79c107 | 1508 | |
f29d7f6b | 1509 | build_minimal_symbol_hash_tables (m_objfile, hash_values); |
c906108c SS |
1510 | } |
1511 | } | |
1512 | ||
c9630d9c TT |
1513 | /* Check if PC is in a shared library trampoline code stub. |
1514 | Return minimal symbol for the trampoline entry or NULL if PC is not | |
1515 | in a trampoline code stub. */ | |
c906108c | 1516 | |
c9630d9c | 1517 | static struct minimal_symbol * |
fba45db2 | 1518 | lookup_solib_trampoline_symbol_by_pc (CORE_ADDR pc) |
c906108c | 1519 | { |
20944a6e PA |
1520 | bound_minimal_symbol msymbol |
1521 | = lookup_minimal_symbol_by_pc_section (pc, NULL, | |
1522 | lookup_msym_prefer::TRAMPOLINE); | |
c906108c | 1523 | |
7cbd4a93 | 1524 | if (msymbol.minsym != NULL |
60f62e2b | 1525 | && msymbol.minsym->type () == mst_solib_trampoline) |
7cbd4a93 | 1526 | return msymbol.minsym; |
c906108c SS |
1527 | return NULL; |
1528 | } | |
1529 | ||
1530 | /* If PC is in a shared library trampoline code stub, return the | |
1531 | address of the `real' function belonging to the stub. | |
1532 | Return 0 if PC is not in a trampoline code stub or if the real | |
1533 | function is not found in the minimal symbol table. | |
1534 | ||
1535 | We may fail to find the right function if a function with the | |
1536 | same name is defined in more than one shared library, but this | |
025bb325 | 1537 | is considered bad programming style. We could return 0 if we find |
c906108c SS |
1538 | a duplicate function in case this matters someday. */ |
1539 | ||
1540 | CORE_ADDR | |
52f729a7 | 1541 | find_solib_trampoline_target (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 1542 | { |
c906108c SS |
1543 | struct minimal_symbol *tsymbol = lookup_solib_trampoline_symbol_by_pc (pc); |
1544 | ||
1545 | if (tsymbol != NULL) | |
1546 | { | |
2030c079 | 1547 | for (objfile *objfile : current_program_space->objfiles ()) |
5325b9bf | 1548 | { |
7932255d | 1549 | for (minimal_symbol *msymbol : objfile->msymbols ()) |
5325b9bf TT |
1550 | { |
1551 | /* Also handle minimal symbols pointing to function | |
1552 | descriptors. */ | |
60f62e2b SM |
1553 | if ((msymbol->type () == mst_text |
1554 | || msymbol->type () == mst_text_gnu_ifunc | |
1555 | || msymbol->type () == mst_data | |
1556 | || msymbol->type () == mst_data_gnu_ifunc) | |
c9d95fa3 CB |
1557 | && strcmp (msymbol->linkage_name (), |
1558 | tsymbol->linkage_name ()) == 0) | |
5325b9bf TT |
1559 | { |
1560 | CORE_ADDR func; | |
b8d56208 | 1561 | |
5325b9bf TT |
1562 | /* Ignore data symbols that are not function |
1563 | descriptors. */ | |
1564 | if (msymbol_is_function (objfile, msymbol, &func)) | |
1565 | return func; | |
1566 | } | |
1567 | } | |
1568 | } | |
c906108c SS |
1569 | } |
1570 | return 0; | |
1571 | } | |
50e65b17 TT |
1572 | |
1573 | /* See minsyms.h. */ | |
1574 | ||
1575 | CORE_ADDR | |
1576 | minimal_symbol_upper_bound (struct bound_minimal_symbol minsym) | |
1577 | { | |
50e65b17 TT |
1578 | short section; |
1579 | struct obj_section *obj_section; | |
1580 | CORE_ADDR result; | |
20dc7e9b | 1581 | struct minimal_symbol *iter, *msymbol; |
50e65b17 TT |
1582 | |
1583 | gdb_assert (minsym.minsym != NULL); | |
1584 | ||
1585 | /* If the minimal symbol has a size, use it. Otherwise use the | |
1586 | lesser of the next minimal symbol in the same section, or the end | |
1587 | of the section, as the end of the function. */ | |
1588 | ||
5bbfd12d SM |
1589 | if (minsym.minsym->size () != 0) |
1590 | return minsym.value_address () + minsym.minsym->size (); | |
50e65b17 TT |
1591 | |
1592 | /* Step over other symbols at this same address, and symbols in | |
1593 | other sections, to find the next symbol in this section with a | |
1594 | different address. */ | |
1595 | ||
20dc7e9b PW |
1596 | struct minimal_symbol *past_the_end |
1597 | = (minsym.objfile->per_bfd->msymbols.get () | |
1598 | + minsym.objfile->per_bfd->minimal_symbol_count); | |
50e65b17 | 1599 | msymbol = minsym.minsym; |
a52d653e | 1600 | section = msymbol->section_index (); |
20dc7e9b | 1601 | for (iter = msymbol + 1; iter != past_the_end; ++iter) |
50e65b17 | 1602 | { |
4aeddc50 SM |
1603 | if ((iter->value_raw_address () |
1604 | != msymbol->value_raw_address ()) | |
a52d653e | 1605 | && iter->section_index () == section) |
50e65b17 TT |
1606 | break; |
1607 | } | |
1608 | ||
1db66e34 | 1609 | obj_section = minsym.obj_section (); |
20dc7e9b | 1610 | if (iter != past_the_end |
4aeddc50 | 1611 | && (iter->value_address (minsym.objfile) |
0c1bcd23 | 1612 | < obj_section->endaddr ())) |
4aeddc50 | 1613 | result = iter->value_address (minsym.objfile); |
50e65b17 TT |
1614 | else |
1615 | /* We got the start address from the last msymbol in the objfile. | |
1616 | So the end address is the end of the section. */ | |
0c1bcd23 | 1617 | result = obj_section->endaddr (); |
50e65b17 TT |
1618 | |
1619 | return result; | |
1620 | } |