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c906108c | 1 | /* GDB routines for manipulating the minimal symbol tables. |
213516ef | 2 | Copyright (C) 1992-2023 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> |
e0f4b3ec | 55 | #include "gdbsupport/gdb-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 | { |
b1e678d9 AB |
388 | symbol_lookup_debug_printf ("lookup_minimal_symbol (%s, %s, %s)", |
389 | name, sfile != NULL ? sfile : "NULL", | |
390 | objfile_debug_name (objfile)); | |
b5ec771e | 391 | |
9227b5eb JB |
392 | /* Do two passes: the first over the ordinary hash table, |
393 | and the second over the demangled hash table. */ | |
b5ec771e PA |
394 | lookup_minimal_symbol_mangled (name, sfile, objfile, |
395 | objfile->per_bfd->msymbol_hash, | |
396 | mangled_hash, mangled_cmp, found); | |
cc485e62 | 397 | |
b5ec771e PA |
398 | /* If not found, try the demangled hash table. */ |
399 | if (found.external_symbol.minsym == NULL) | |
c906108c | 400 | { |
b5ec771e PA |
401 | /* Once for each language in the demangled hash names |
402 | table (usually just zero or one languages). */ | |
1b7a07cb | 403 | for (unsigned iter = 0; iter < nr_languages; ++iter) |
c906108c | 404 | { |
1b7a07cb TT |
405 | if (!objfile->per_bfd->demangled_hash_languages.test (iter)) |
406 | continue; | |
407 | enum language lang = (enum language) iter; | |
408 | ||
b5ec771e PA |
409 | unsigned int hash |
410 | = (lookup_name.search_name_hash (lang) | |
411 | % MINIMAL_SYMBOL_HASH_SIZE); | |
412 | ||
413 | symbol_name_matcher_ftype *match | |
c9debfb9 AB |
414 | = language_def (lang)->get_symbol_name_matcher |
415 | (lookup_name); | |
b5ec771e PA |
416 | struct minimal_symbol **msymbol_demangled_hash |
417 | = objfile->per_bfd->msymbol_demangled_hash; | |
418 | ||
419 | lookup_minimal_symbol_demangled (lookup_name, sfile, objfile, | |
420 | msymbol_demangled_hash, | |
421 | hash, match, found); | |
422 | ||
423 | if (found.external_symbol.minsym != NULL) | |
424 | break; | |
9227b5eb | 425 | } |
c906108c SS |
426 | } |
427 | } | |
428 | } | |
71c25dea | 429 | |
c906108c | 430 | /* External symbols are best. */ |
b5ec771e | 431 | if (found.external_symbol.minsym != NULL) |
cc485e62 DE |
432 | { |
433 | if (symbol_lookup_debug) | |
434 | { | |
b5ec771e PA |
435 | minimal_symbol *minsym = found.external_symbol.minsym; |
436 | ||
b1e678d9 AB |
437 | symbol_lookup_debug_printf |
438 | ("lookup_minimal_symbol (...) = %s (external)", | |
439 | host_address_to_string (minsym)); | |
cc485e62 | 440 | } |
b5ec771e | 441 | return found.external_symbol; |
cc485e62 | 442 | } |
c906108c SS |
443 | |
444 | /* File-local symbols are next best. */ | |
b5ec771e | 445 | if (found.file_symbol.minsym != NULL) |
cc485e62 DE |
446 | { |
447 | if (symbol_lookup_debug) | |
448 | { | |
b5ec771e PA |
449 | minimal_symbol *minsym = found.file_symbol.minsym; |
450 | ||
b1e678d9 AB |
451 | symbol_lookup_debug_printf |
452 | ("lookup_minimal_symbol (...) = %s (file-local)", | |
453 | host_address_to_string (minsym)); | |
cc485e62 | 454 | } |
b5ec771e | 455 | return found.file_symbol; |
cc485e62 | 456 | } |
c906108c SS |
457 | |
458 | /* Symbols for shared library trampolines are next best. */ | |
b5ec771e | 459 | if (found.trampoline_symbol.minsym != NULL) |
cc485e62 | 460 | { |
b5ec771e PA |
461 | if (symbol_lookup_debug) |
462 | { | |
463 | minimal_symbol *minsym = found.trampoline_symbol.minsym; | |
464 | ||
b1e678d9 AB |
465 | symbol_lookup_debug_printf |
466 | ("lookup_minimal_symbol (...) = %s (trampoline)", | |
467 | host_address_to_string (minsym)); | |
b5ec771e PA |
468 | } |
469 | ||
470 | return found.trampoline_symbol; | |
cc485e62 | 471 | } |
b5ec771e PA |
472 | |
473 | /* Not found. */ | |
b1e678d9 | 474 | symbol_lookup_debug_printf ("lookup_minimal_symbol (...) = NULL"); |
b5ec771e | 475 | return {}; |
7c7b6655 TT |
476 | } |
477 | ||
478 | /* See minsyms.h. */ | |
c906108c | 479 | |
7c7b6655 TT |
480 | struct bound_minimal_symbol |
481 | lookup_bound_minimal_symbol (const char *name) | |
482 | { | |
3b7344d5 | 483 | return lookup_minimal_symbol (name, NULL, NULL); |
c906108c SS |
484 | } |
485 | ||
268a13a5 | 486 | /* See gdbsupport/symbol.h. */ |
bd9269f7 GB |
487 | |
488 | int | |
489 | find_minimal_symbol_address (const char *name, CORE_ADDR *addr, | |
490 | struct objfile *objfile) | |
491 | { | |
492 | struct bound_minimal_symbol sym | |
493 | = lookup_minimal_symbol (name, NULL, objfile); | |
494 | ||
495 | if (sym.minsym != NULL) | |
4aeddc50 | 496 | *addr = sym.value_address (); |
bd9269f7 GB |
497 | |
498 | return sym.minsym == NULL; | |
499 | } | |
500 | ||
8825213e PA |
501 | /* Get the lookup name form best suitable for linkage name |
502 | matching. */ | |
503 | ||
504 | static const char * | |
505 | linkage_name_str (const lookup_name_info &lookup_name) | |
506 | { | |
507 | /* Unlike most languages (including C++), Ada uses the | |
508 | encoded/linkage name as the search name recorded in symbols. So | |
509 | if debugging in Ada mode, prefer the Ada-encoded name. This also | |
510 | makes Ada's verbatim match syntax ("<...>") work, because | |
511 | "lookup_name.name()" includes the "<>"s, while | |
512 | "lookup_name.ada().lookup_name()" is the encoded name with "<>"s | |
513 | stripped. */ | |
514 | if (current_language->la_language == language_ada) | |
515 | return lookup_name.ada ().lookup_name ().c_str (); | |
516 | ||
e0802d59 | 517 | return lookup_name.c_str (); |
8825213e PA |
518 | } |
519 | ||
b19686e0 | 520 | /* See minsyms.h. */ |
f8eba3c6 TT |
521 | |
522 | void | |
41c1efc6 TT |
523 | iterate_over_minimal_symbols |
524 | (struct objfile *objf, const lookup_name_info &lookup_name, | |
ca31ab1d | 525 | gdb::function_view<bool (struct minimal_symbol *)> callback) |
f8eba3c6 | 526 | { |
f8eba3c6 | 527 | /* The first pass is over the ordinary hash table. */ |
f8eba3c6 | 528 | { |
8825213e | 529 | const char *name = linkage_name_str (lookup_name); |
b5ec771e PA |
530 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
531 | auto *mangled_cmp | |
532 | = (case_sensitivity == case_sensitive_on | |
533 | ? strcmp | |
534 | : strcasecmp); | |
535 | ||
536 | for (minimal_symbol *iter = objf->per_bfd->msymbol_hash[hash]; | |
537 | iter != NULL; | |
538 | iter = iter->hash_next) | |
539 | { | |
c9d95fa3 | 540 | if (mangled_cmp (iter->linkage_name (), name) == 0) |
ca31ab1d PA |
541 | if (callback (iter)) |
542 | return; | |
b5ec771e | 543 | } |
f8eba3c6 TT |
544 | } |
545 | ||
b5ec771e PA |
546 | /* The second pass is over the demangled table. Once for each |
547 | language in the demangled hash names table (usually just zero or | |
548 | one). */ | |
1b7a07cb | 549 | for (unsigned liter = 0; liter < nr_languages; ++liter) |
f8eba3c6 | 550 | { |
1b7a07cb TT |
551 | if (!objf->per_bfd->demangled_hash_languages.test (liter)) |
552 | continue; | |
553 | ||
554 | enum language lang = (enum language) liter; | |
b5ec771e PA |
555 | const language_defn *lang_def = language_def (lang); |
556 | symbol_name_matcher_ftype *name_match | |
c9debfb9 | 557 | = lang_def->get_symbol_name_matcher (lookup_name); |
b5ec771e PA |
558 | |
559 | unsigned int hash | |
560 | = lookup_name.search_name_hash (lang) % MINIMAL_SYMBOL_HASH_SIZE; | |
561 | for (minimal_symbol *iter = objf->per_bfd->msymbol_demangled_hash[hash]; | |
562 | iter != NULL; | |
563 | iter = iter->demangled_hash_next) | |
c9d95fa3 | 564 | if (name_match (iter->search_name (), lookup_name, NULL)) |
ca31ab1d PA |
565 | if (callback (iter)) |
566 | return; | |
f8eba3c6 TT |
567 | } |
568 | } | |
569 | ||
b19686e0 | 570 | /* See minsyms.h. */ |
c5aa993b | 571 | |
4b610737 TT |
572 | bound_minimal_symbol |
573 | lookup_minimal_symbol_linkage (const char *name, struct objfile *objf) | |
574 | { | |
575 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
576 | ||
577 | for (objfile *objfile : objf->separate_debug_objfiles ()) | |
578 | { | |
579 | for (minimal_symbol *msymbol = objfile->per_bfd->msymbol_hash[hash]; | |
580 | msymbol != NULL; | |
581 | msymbol = msymbol->hash_next) | |
582 | { | |
c9d95fa3 | 583 | if (strcmp (msymbol->linkage_name (), name) == 0 |
60f62e2b SM |
584 | && (msymbol->type () == mst_data |
585 | || msymbol->type () == mst_bss)) | |
4b610737 TT |
586 | return {msymbol, objfile}; |
587 | } | |
588 | } | |
589 | ||
590 | return {}; | |
591 | } | |
592 | ||
593 | /* See minsyms.h. */ | |
594 | ||
47ef0ac7 TT |
595 | struct bound_minimal_symbol |
596 | lookup_minimal_symbol_linkage (const char *name, bool only_main) | |
597 | { | |
598 | for (objfile *objfile : current_program_space->objfiles ()) | |
599 | { | |
600 | if (objfile->separate_debug_objfile_backlink != nullptr) | |
601 | continue; | |
602 | ||
603 | if (only_main && (objfile->flags & OBJF_MAINLINE) == 0) | |
604 | continue; | |
605 | ||
606 | bound_minimal_symbol minsym = lookup_minimal_symbol_linkage (name, | |
607 | objfile); | |
608 | if (minsym.minsym != nullptr) | |
609 | return minsym; | |
610 | } | |
611 | ||
612 | return {}; | |
613 | } | |
614 | ||
615 | /* See minsyms.h. */ | |
616 | ||
3b7344d5 | 617 | struct bound_minimal_symbol |
5520a790 | 618 | lookup_minimal_symbol_text (const char *name, struct objfile *objf) |
c906108c | 619 | { |
c906108c | 620 | struct minimal_symbol *msymbol; |
f6b3ad54 TT |
621 | struct bound_minimal_symbol found_symbol; |
622 | struct bound_minimal_symbol found_file_symbol; | |
c906108c | 623 | |
72a5efb3 DJ |
624 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
625 | ||
bf227d61 | 626 | for (objfile *objfile : current_program_space->objfiles ()) |
c906108c | 627 | { |
bf227d61 TT |
628 | if (found_symbol.minsym != NULL) |
629 | break; | |
630 | ||
56e3f43c | 631 | if (objf == NULL || objf == objfile |
15d123c9 | 632 | || objf == objfile->separate_debug_objfile_backlink) |
c906108c | 633 | { |
34643a32 | 634 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
3b7344d5 | 635 | msymbol != NULL && found_symbol.minsym == NULL; |
72a5efb3 | 636 | msymbol = msymbol->hash_next) |
c906108c | 637 | { |
c9d95fa3 | 638 | if (strcmp (msymbol->linkage_name (), name) == 0 && |
60f62e2b SM |
639 | (msymbol->type () == mst_text |
640 | || msymbol->type () == mst_text_gnu_ifunc | |
641 | || msymbol->type () == mst_file_text)) | |
c906108c | 642 | { |
60f62e2b | 643 | switch (msymbol->type ()) |
c906108c SS |
644 | { |
645 | case mst_file_text: | |
3b7344d5 TT |
646 | found_file_symbol.minsym = msymbol; |
647 | found_file_symbol.objfile = objfile; | |
c906108c SS |
648 | break; |
649 | default: | |
3b7344d5 TT |
650 | found_symbol.minsym = msymbol; |
651 | found_symbol.objfile = objfile; | |
c906108c SS |
652 | break; |
653 | } | |
654 | } | |
655 | } | |
656 | } | |
657 | } | |
658 | /* External symbols are best. */ | |
3b7344d5 | 659 | if (found_symbol.minsym) |
c906108c SS |
660 | return found_symbol; |
661 | ||
662 | /* File-local symbols are next best. */ | |
3b7344d5 | 663 | return found_file_symbol; |
c906108c SS |
664 | } |
665 | ||
b19686e0 | 666 | /* See minsyms.h. */ |
907fc202 UW |
667 | |
668 | struct minimal_symbol * | |
669 | lookup_minimal_symbol_by_pc_name (CORE_ADDR pc, const char *name, | |
670 | struct objfile *objf) | |
671 | { | |
907fc202 UW |
672 | struct minimal_symbol *msymbol; |
673 | ||
674 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
675 | ||
bf227d61 | 676 | for (objfile *objfile : current_program_space->objfiles ()) |
907fc202 UW |
677 | { |
678 | if (objf == NULL || objf == objfile | |
15d123c9 | 679 | || objf == objfile->separate_debug_objfile_backlink) |
907fc202 | 680 | { |
34643a32 | 681 | for (msymbol = objfile->per_bfd->msymbol_hash[hash]; |
907fc202 UW |
682 | msymbol != NULL; |
683 | msymbol = msymbol->hash_next) | |
684 | { | |
4aeddc50 | 685 | if (msymbol->value_address (objfile) == pc |
c9d95fa3 | 686 | && strcmp (msymbol->linkage_name (), name) == 0) |
907fc202 UW |
687 | return msymbol; |
688 | } | |
689 | } | |
690 | } | |
691 | ||
692 | return NULL; | |
693 | } | |
694 | ||
77e371c0 TT |
695 | /* A helper function that makes *PC section-relative. This searches |
696 | the sections of OBJFILE and if *PC is in a section, it subtracts | |
9675da25 TT |
697 | the section offset, stores the result into UNREL_ADDR, and returns |
698 | true. Otherwise it returns false. */ | |
77e371c0 TT |
699 | |
700 | static int | |
9675da25 TT |
701 | frob_address (struct objfile *objfile, CORE_ADDR pc, |
702 | unrelocated_addr *unrel_addr) | |
77e371c0 | 703 | { |
5250cbc8 | 704 | for (obj_section *iter : objfile->sections ()) |
77e371c0 | 705 | { |
9675da25 | 706 | if (pc >= iter->addr () && pc < iter->endaddr ()) |
77e371c0 | 707 | { |
9675da25 | 708 | *unrel_addr = unrelocated_addr (pc - iter->offset ()); |
77e371c0 TT |
709 | return 1; |
710 | } | |
711 | } | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
6ae50267 PA |
716 | /* Helper for lookup_minimal_symbol_by_pc_section. Convert a |
717 | lookup_msym_prefer to a minimal_symbol_type. */ | |
718 | ||
719 | static minimal_symbol_type | |
720 | msym_prefer_to_msym_type (lookup_msym_prefer prefer) | |
721 | { | |
722 | switch (prefer) | |
723 | { | |
724 | case lookup_msym_prefer::TEXT: | |
725 | return mst_text; | |
726 | case lookup_msym_prefer::TRAMPOLINE: | |
727 | return mst_solib_trampoline; | |
728 | case lookup_msym_prefer::GNU_IFUNC: | |
729 | return mst_text_gnu_ifunc; | |
730 | } | |
731 | ||
732 | /* Assert here instead of in a default switch case above so that | |
733 | -Wswitch warns if a new enumerator is added. */ | |
734 | gdb_assert_not_reached ("unhandled lookup_msym_prefer"); | |
735 | } | |
736 | ||
733d0a67 AB |
737 | /* See minsyms.h. |
738 | ||
00878c6e PP |
739 | Note that we need to look through ALL the minimal symbol tables |
740 | before deciding on the symbol that comes closest to the specified PC. | |
741 | This is because objfiles can overlap, for example objfile A has .text | |
742 | at 0x100 and .data at 0x40000 and objfile B has .text at 0x234 and | |
733d0a67 | 743 | .data at 0x40048. */ |
2eaf8d2a | 744 | |
20944a6e PA |
745 | bound_minimal_symbol |
746 | lookup_minimal_symbol_by_pc_section (CORE_ADDR pc_in, struct obj_section *section, | |
733d0a67 AB |
747 | lookup_msym_prefer prefer, |
748 | bound_minimal_symbol *previous) | |
c906108c SS |
749 | { |
750 | int lo; | |
751 | int hi; | |
fe978cb0 | 752 | int newobj; |
c906108c SS |
753 | struct minimal_symbol *msymbol; |
754 | struct minimal_symbol *best_symbol = NULL; | |
7cbd4a93 TT |
755 | struct objfile *best_objfile = NULL; |
756 | struct bound_minimal_symbol result; | |
c906108c | 757 | |
733d0a67 AB |
758 | if (previous != nullptr) |
759 | { | |
760 | previous->minsym = nullptr; | |
761 | previous->objfile = nullptr; | |
762 | } | |
763 | ||
20944a6e PA |
764 | if (section == NULL) |
765 | { | |
766 | section = find_pc_section (pc_in); | |
767 | if (section == NULL) | |
768 | return {}; | |
769 | } | |
770 | ||
6ae50267 | 771 | minimal_symbol_type want_type = msym_prefer_to_msym_type (prefer); |
00878c6e PP |
772 | |
773 | /* We can not require the symbol found to be in section, because | |
96225718 DJ |
774 | e.g. IRIX 6.5 mdebug relies on this code returning an absolute |
775 | symbol - but find_pc_section won't return an absolute section and | |
776 | hence the code below would skip over absolute symbols. We can | |
777 | still take advantage of the call to find_pc_section, though - the | |
778 | object file still must match. In case we have separate debug | |
779 | files, search both the file and its separate debug file. There's | |
780 | no telling which one will have the minimal symbols. */ | |
781 | ||
00878c6e | 782 | gdb_assert (section != NULL); |
96225718 | 783 | |
bde09ab7 | 784 | for (objfile *objfile : section->objfile->separate_debug_objfiles ()) |
c906108c | 785 | { |
77e371c0 TT |
786 | CORE_ADDR pc = pc_in; |
787 | ||
741d7538 | 788 | /* If this objfile has a minimal symbol table, go search it |
dda83cd7 | 789 | using a binary search. */ |
c906108c | 790 | |
34643a32 | 791 | if (objfile->per_bfd->minimal_symbol_count > 0) |
c906108c | 792 | { |
29e8a844 DJ |
793 | int best_zero_sized = -1; |
794 | ||
dda83cd7 | 795 | msymbol = objfile->per_bfd->msymbols.get (); |
c906108c | 796 | lo = 0; |
34643a32 | 797 | hi = objfile->per_bfd->minimal_symbol_count - 1; |
c906108c SS |
798 | |
799 | /* This code assumes that the minimal symbols are sorted by | |
800 | ascending address values. If the pc value is greater than or | |
801 | equal to the first symbol's address, then some symbol in this | |
802 | minimal symbol table is a suitable candidate for being the | |
803 | "best" symbol. This includes the last real symbol, for cases | |
804 | where the pc value is larger than any address in this vector. | |
805 | ||
806 | By iterating until the address associated with the current | |
807 | hi index (the endpoint of the test interval) is less than | |
808 | or equal to the desired pc value, we accomplish two things: | |
809 | (1) the case where the pc value is larger than any minimal | |
810 | symbol address is trivially solved, (2) the address associated | |
30baf67b | 811 | with the hi index is always the one we want when the iteration |
c906108c SS |
812 | terminates. In essence, we are iterating the test interval |
813 | down until the pc value is pushed out of it from the high end. | |
814 | ||
025bb325 | 815 | Warning: this code is trickier than it would appear at first. */ |
c906108c | 816 | |
9675da25 TT |
817 | unrelocated_addr unrel_pc; |
818 | if (frob_address (objfile, pc, &unrel_pc) | |
93d50cd8 | 819 | && unrel_pc >= msymbol[lo].unrelocated_address ()) |
c906108c | 820 | { |
93d50cd8 | 821 | while (msymbol[hi].unrelocated_address () > unrel_pc) |
c906108c | 822 | { |
025bb325 MS |
823 | /* pc is still strictly less than highest address. */ |
824 | /* Note "new" will always be >= lo. */ | |
fe978cb0 | 825 | newobj = (lo + hi) / 2; |
93d50cd8 | 826 | if ((msymbol[newobj].unrelocated_address () >= unrel_pc) |
fe978cb0 | 827 | || (lo == newobj)) |
c906108c | 828 | { |
fe978cb0 | 829 | hi = newobj; |
c906108c SS |
830 | } |
831 | else | |
832 | { | |
fe978cb0 | 833 | lo = newobj; |
c906108c SS |
834 | } |
835 | } | |
836 | ||
837 | /* If we have multiple symbols at the same address, we want | |
dda83cd7 SM |
838 | hi to point to the last one. That way we can find the |
839 | right symbol if it has an index greater than hi. */ | |
34643a32 | 840 | while (hi < objfile->per_bfd->minimal_symbol_count - 1 |
93d50cd8 TT |
841 | && (msymbol[hi].unrelocated_address () |
842 | == msymbol[hi + 1].unrelocated_address ())) | |
c906108c SS |
843 | hi++; |
844 | ||
29e8a844 DJ |
845 | /* Skip various undesirable symbols. */ |
846 | while (hi >= 0) | |
847 | { | |
848 | /* Skip any absolute symbols. This is apparently | |
849 | what adb and dbx do, and is needed for the CM-5. | |
850 | There are two known possible problems: (1) on | |
851 | ELF, apparently end, edata, etc. are absolute. | |
852 | Not sure ignoring them here is a big deal, but if | |
853 | we want to use them, the fix would go in | |
854 | elfread.c. (2) I think shared library entry | |
855 | points on the NeXT are absolute. If we want | |
856 | special handling for this it probably should be | |
857 | triggered by a special mst_abs_or_lib or some | |
858 | such. */ | |
859 | ||
60f62e2b | 860 | if (msymbol[hi].type () == mst_abs) |
29e8a844 DJ |
861 | { |
862 | hi--; | |
863 | continue; | |
864 | } | |
865 | ||
866 | /* If SECTION was specified, skip any symbol from | |
867 | wrong section. */ | |
868 | if (section | |
869 | /* Some types of debug info, such as COFF, | |
870 | don't fill the bfd_section member, so don't | |
871 | throw away symbols on those platforms. */ | |
ebbc3a7d | 872 | && msymbol[hi].obj_section (objfile) != nullptr |
714835d5 | 873 | && (!matching_obj_sections |
ebbc3a7d | 874 | (msymbol[hi].obj_section (objfile), |
e27d198c | 875 | section))) |
29e8a844 DJ |
876 | { |
877 | hi--; | |
878 | continue; | |
879 | } | |
880 | ||
2eaf8d2a DJ |
881 | /* If we are looking for a trampoline and this is a |
882 | text symbol, or the other way around, check the | |
177b42fe | 883 | preceding symbol too. If they are otherwise |
2eaf8d2a DJ |
884 | identical prefer that one. */ |
885 | if (hi > 0 | |
60f62e2b SM |
886 | && msymbol[hi].type () != want_type |
887 | && msymbol[hi - 1].type () == want_type | |
5bbfd12d | 888 | && (msymbol[hi].size () == msymbol[hi - 1].size ()) |
93d50cd8 TT |
889 | && (msymbol[hi].unrelocated_address () |
890 | == msymbol[hi - 1].unrelocated_address ()) | |
ebbc3a7d AB |
891 | && (msymbol[hi].obj_section (objfile) |
892 | == msymbol[hi - 1].obj_section (objfile))) | |
2eaf8d2a DJ |
893 | { |
894 | hi--; | |
895 | continue; | |
896 | } | |
897 | ||
29e8a844 DJ |
898 | /* If the minimal symbol has a zero size, save it |
899 | but keep scanning backwards looking for one with | |
900 | a non-zero size. A zero size may mean that the | |
901 | symbol isn't an object or function (e.g. a | |
902 | label), or it may just mean that the size was not | |
903 | specified. */ | |
5bbfd12d | 904 | if (msymbol[hi].size () == 0) |
29e8a844 | 905 | { |
5506f9f6 KB |
906 | if (best_zero_sized == -1) |
907 | best_zero_sized = hi; | |
29e8a844 DJ |
908 | hi--; |
909 | continue; | |
910 | } | |
911 | ||
f7a6bb70 DJ |
912 | /* If we are past the end of the current symbol, try |
913 | the previous symbol if it has a larger overlapping | |
914 | size. This happens on i686-pc-linux-gnu with glibc; | |
915 | the nocancel variants of system calls are inside | |
916 | the cancellable variants, but both have sizes. */ | |
917 | if (hi > 0 | |
5bbfd12d | 918 | && msymbol[hi].size () != 0 |
93d50cd8 TT |
919 | && unrel_pc >= msymbol[hi].unrelocated_end_address () |
920 | && unrel_pc < msymbol[hi - 1].unrelocated_end_address ()) | |
f7a6bb70 DJ |
921 | { |
922 | hi--; | |
923 | continue; | |
924 | } | |
925 | ||
29e8a844 DJ |
926 | /* Otherwise, this symbol must be as good as we're going |
927 | to get. */ | |
928 | break; | |
929 | } | |
930 | ||
931 | /* If HI has a zero size, and best_zero_sized is set, | |
932 | then we had two or more zero-sized symbols; prefer | |
933 | the first one we found (which may have a higher | |
934 | address). Also, if we ran off the end, be sure | |
935 | to back up. */ | |
936 | if (best_zero_sized != -1 | |
5bbfd12d | 937 | && (hi < 0 || msymbol[hi].size () == 0)) |
29e8a844 DJ |
938 | hi = best_zero_sized; |
939 | ||
940 | /* If the minimal symbol has a non-zero size, and this | |
941 | PC appears to be outside the symbol's contents, then | |
942 | refuse to use this symbol. If we found a zero-sized | |
943 | symbol with an address greater than this symbol's, | |
944 | use that instead. We assume that if symbols have | |
945 | specified sizes, they do not overlap. */ | |
946 | ||
947 | if (hi >= 0 | |
5bbfd12d | 948 | && msymbol[hi].size () != 0 |
93d50cd8 | 949 | && unrel_pc >= msymbol[hi].unrelocated_end_address ()) |
29e8a844 DJ |
950 | { |
951 | if (best_zero_sized != -1) | |
952 | hi = best_zero_sized; | |
953 | else | |
733d0a67 AB |
954 | { |
955 | /* If needed record this symbol as the closest | |
956 | previous symbol. */ | |
957 | if (previous != nullptr) | |
958 | { | |
959 | if (previous->minsym == nullptr | |
93d50cd8 TT |
960 | || (msymbol[hi].unrelocated_address () |
961 | > previous->minsym->unrelocated_address ())) | |
733d0a67 AB |
962 | { |
963 | previous->minsym = &msymbol[hi]; | |
964 | previous->objfile = objfile; | |
965 | } | |
966 | } | |
967 | /* Go on to the next object file. */ | |
968 | continue; | |
969 | } | |
29e8a844 DJ |
970 | } |
971 | ||
c906108c | 972 | /* The minimal symbol indexed by hi now is the best one in this |
dda83cd7 SM |
973 | objfile's minimal symbol table. See if it is the best one |
974 | overall. */ | |
c906108c | 975 | |
c906108c SS |
976 | if (hi >= 0 |
977 | && ((best_symbol == NULL) || | |
93d50cd8 TT |
978 | (best_symbol->unrelocated_address () < |
979 | msymbol[hi].unrelocated_address ()))) | |
c906108c SS |
980 | { |
981 | best_symbol = &msymbol[hi]; | |
7cbd4a93 | 982 | best_objfile = objfile; |
c906108c SS |
983 | } |
984 | } | |
985 | } | |
986 | } | |
7cbd4a93 TT |
987 | |
988 | result.minsym = best_symbol; | |
989 | result.objfile = best_objfile; | |
990 | return result; | |
c906108c SS |
991 | } |
992 | ||
b19686e0 | 993 | /* See minsyms.h. */ |
c906108c | 994 | |
7cbd4a93 | 995 | struct bound_minimal_symbol |
fba45db2 | 996 | lookup_minimal_symbol_by_pc (CORE_ADDR pc) |
c906108c | 997 | { |
20944a6e | 998 | return lookup_minimal_symbol_by_pc_section (pc, NULL); |
c906108c | 999 | } |
0d5392b8 | 1000 | |
0875794a JK |
1001 | /* Return non-zero iff PC is in an STT_GNU_IFUNC function resolver. */ |
1002 | ||
ececd218 | 1003 | bool |
0875794a JK |
1004 | in_gnu_ifunc_stub (CORE_ADDR pc) |
1005 | { | |
20944a6e PA |
1006 | bound_minimal_symbol msymbol |
1007 | = lookup_minimal_symbol_by_pc_section (pc, NULL, | |
1008 | lookup_msym_prefer::GNU_IFUNC); | |
60f62e2b | 1009 | return msymbol.minsym && msymbol.minsym->type () == mst_text_gnu_ifunc; |
0875794a JK |
1010 | } |
1011 | ||
07be84bf JK |
1012 | /* See elf_gnu_ifunc_resolve_addr for its real implementation. */ |
1013 | ||
1014 | static CORE_ADDR | |
1015 | stub_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1016 | { | |
1017 | error (_("GDB cannot resolve STT_GNU_IFUNC symbol at address %s without " | |
1018 | "the ELF support compiled in."), | |
1019 | paddress (gdbarch, pc)); | |
1020 | } | |
1021 | ||
1022 | /* See elf_gnu_ifunc_resolve_name for its real implementation. */ | |
1023 | ||
ececd218 | 1024 | static bool |
07be84bf JK |
1025 | stub_gnu_ifunc_resolve_name (const char *function_name, |
1026 | CORE_ADDR *function_address_p) | |
1027 | { | |
1028 | error (_("GDB cannot resolve STT_GNU_IFUNC symbol \"%s\" without " | |
1029 | "the ELF support compiled in."), | |
1030 | function_name); | |
1031 | } | |
1032 | ||
0e30163f JK |
1033 | /* See elf_gnu_ifunc_resolver_stop for its real implementation. */ |
1034 | ||
1035 | static void | |
74421c0b | 1036 | stub_gnu_ifunc_resolver_stop (code_breakpoint *b) |
0e30163f | 1037 | { |
f34652de | 1038 | internal_error (_("elf_gnu_ifunc_resolver_stop cannot be reached.")); |
0e30163f JK |
1039 | } |
1040 | ||
1041 | /* See elf_gnu_ifunc_resolver_return_stop for its real implementation. */ | |
1042 | ||
1043 | static void | |
74421c0b | 1044 | stub_gnu_ifunc_resolver_return_stop (code_breakpoint *b) |
0e30163f | 1045 | { |
f34652de | 1046 | internal_error (_("elf_gnu_ifunc_resolver_return_stop cannot be reached.")); |
0e30163f JK |
1047 | } |
1048 | ||
07be84bf JK |
1049 | /* See elf_gnu_ifunc_fns for its real implementation. */ |
1050 | ||
1051 | static const struct gnu_ifunc_fns stub_gnu_ifunc_fns = | |
1052 | { | |
1053 | stub_gnu_ifunc_resolve_addr, | |
1054 | stub_gnu_ifunc_resolve_name, | |
0e30163f JK |
1055 | stub_gnu_ifunc_resolver_stop, |
1056 | stub_gnu_ifunc_resolver_return_stop, | |
07be84bf JK |
1057 | }; |
1058 | ||
1059 | /* A placeholder for &elf_gnu_ifunc_fns. */ | |
1060 | ||
1061 | const struct gnu_ifunc_fns *gnu_ifunc_fns_p = &stub_gnu_ifunc_fns; | |
1062 | ||
c906108c | 1063 | \f |
c5aa993b | 1064 | |
025bb325 | 1065 | /* Return leading symbol character for a BFD. If BFD is NULL, |
c906108c SS |
1066 | return the leading symbol character from the main objfile. */ |
1067 | ||
c906108c | 1068 | static int |
fba45db2 | 1069 | get_symbol_leading_char (bfd *abfd) |
c906108c SS |
1070 | { |
1071 | if (abfd != NULL) | |
1072 | return bfd_get_symbol_leading_char (abfd); | |
a42d7dd8 TT |
1073 | if (current_program_space->symfile_object_file != NULL) |
1074 | { | |
1075 | objfile *objf = current_program_space->symfile_object_file; | |
1076 | if (objf->obfd != NULL) | |
98badbfd | 1077 | return bfd_get_symbol_leading_char (objf->obfd.get ()); |
a42d7dd8 | 1078 | } |
c906108c SS |
1079 | return 0; |
1080 | } | |
1081 | ||
b19686e0 | 1082 | /* See minsyms.h. */ |
c906108c | 1083 | |
d25e8719 | 1084 | minimal_symbol_reader::minimal_symbol_reader (struct objfile *obj) |
8dddcb8f TT |
1085 | : m_objfile (obj), |
1086 | m_msym_bunch (NULL), | |
1087 | /* Note that presetting m_msym_bunch_index to BUNCH_SIZE causes the | |
b19686e0 TT |
1088 | first call to save a minimal symbol to allocate the memory for |
1089 | the first bunch. */ | |
8dddcb8f TT |
1090 | m_msym_bunch_index (BUNCH_SIZE), |
1091 | m_msym_count (0) | |
1092 | { | |
c906108c SS |
1093 | } |
1094 | ||
873a915e TT |
1095 | /* Discard the currently collected minimal symbols, if any. If we wish |
1096 | to save them for later use, we must have already copied them somewhere | |
79e7ae11 | 1097 | else before calling this function. */ |
873a915e TT |
1098 | |
1099 | minimal_symbol_reader::~minimal_symbol_reader () | |
1100 | { | |
1101 | struct msym_bunch *next; | |
1102 | ||
8dddcb8f | 1103 | while (m_msym_bunch != NULL) |
873a915e | 1104 | { |
8dddcb8f TT |
1105 | next = m_msym_bunch->next; |
1106 | xfree (m_msym_bunch); | |
1107 | m_msym_bunch = next; | |
873a915e TT |
1108 | } |
1109 | } | |
1110 | ||
b19686e0 TT |
1111 | /* See minsyms.h. */ |
1112 | ||
c906108c | 1113 | void |
9675da25 | 1114 | minimal_symbol_reader::record (const char *name, unrelocated_addr address, |
ce6c454e | 1115 | enum minimal_symbol_type ms_type) |
c906108c SS |
1116 | { |
1117 | int section; | |
1118 | ||
1119 | switch (ms_type) | |
1120 | { | |
1121 | case mst_text: | |
0875794a | 1122 | case mst_text_gnu_ifunc: |
c906108c SS |
1123 | case mst_file_text: |
1124 | case mst_solib_trampoline: | |
8dddcb8f | 1125 | section = SECT_OFF_TEXT (m_objfile); |
c906108c SS |
1126 | break; |
1127 | case mst_data: | |
f50776aa | 1128 | case mst_data_gnu_ifunc: |
c906108c | 1129 | case mst_file_data: |
8dddcb8f | 1130 | section = SECT_OFF_DATA (m_objfile); |
c906108c SS |
1131 | break; |
1132 | case mst_bss: | |
1133 | case mst_file_bss: | |
8dddcb8f | 1134 | section = SECT_OFF_BSS (m_objfile); |
c906108c SS |
1135 | break; |
1136 | default: | |
1137 | section = -1; | |
1138 | } | |
1139 | ||
8dddcb8f | 1140 | record_with_info (name, address, ms_type, section); |
c906108c SS |
1141 | } |
1142 | ||
e08b849e SM |
1143 | /* Convert an enumerator of type minimal_symbol_type to its string |
1144 | representation. */ | |
1145 | ||
1146 | static const char * | |
1147 | mst_str (minimal_symbol_type t) | |
1148 | { | |
1149 | #define MST_TO_STR(x) case x: return #x; | |
1150 | switch (t) | |
1151 | { | |
1152 | MST_TO_STR (mst_unknown); | |
1153 | MST_TO_STR (mst_text); | |
1154 | MST_TO_STR (mst_text_gnu_ifunc); | |
1155 | MST_TO_STR (mst_slot_got_plt); | |
1156 | MST_TO_STR (mst_data); | |
1157 | MST_TO_STR (mst_bss); | |
1158 | MST_TO_STR (mst_abs); | |
1159 | MST_TO_STR (mst_solib_trampoline); | |
1160 | MST_TO_STR (mst_file_text); | |
1161 | MST_TO_STR (mst_file_data); | |
1162 | MST_TO_STR (mst_file_bss); | |
1163 | ||
1164 | default: | |
1165 | return "mst_???"; | |
1166 | } | |
1167 | #undef MST_TO_STR | |
1168 | } | |
1169 | ||
b19686e0 | 1170 | /* See minsyms.h. */ |
c906108c SS |
1171 | |
1172 | struct minimal_symbol * | |
8082468f | 1173 | minimal_symbol_reader::record_full (std::string_view name, |
9675da25 | 1174 | bool copy_name, unrelocated_addr address, |
ce6c454e TT |
1175 | enum minimal_symbol_type ms_type, |
1176 | int section) | |
c906108c | 1177 | { |
fe978cb0 | 1178 | struct msym_bunch *newobj; |
52f0bd74 | 1179 | struct minimal_symbol *msymbol; |
c906108c | 1180 | |
66337bb1 CV |
1181 | /* Don't put gcc_compiled, __gnu_compiled_cplus, and friends into |
1182 | the minimal symbols, because if there is also another symbol | |
1183 | at the same address (e.g. the first function of the file), | |
1184 | lookup_minimal_symbol_by_pc would have no way of getting the | |
1185 | right one. */ | |
1186 | if (ms_type == mst_file_text && name[0] == 'g' | |
31edb802 CB |
1187 | && (name == GCC_COMPILED_FLAG_SYMBOL |
1188 | || name == GCC2_COMPILED_FLAG_SYMBOL)) | |
66337bb1 CV |
1189 | return (NULL); |
1190 | ||
1191 | /* It's safe to strip the leading char here once, since the name | |
025bb325 | 1192 | is also stored stripped in the minimal symbol table. */ |
98badbfd | 1193 | if (name[0] == get_symbol_leading_char (m_objfile->obfd.get ())) |
31edb802 | 1194 | name = name.substr (1); |
66337bb1 | 1195 | |
61012eef | 1196 | if (ms_type == mst_file_text && startswith (name, "__gnu_compiled")) |
66337bb1 | 1197 | return (NULL); |
c906108c | 1198 | |
2ab317fb | 1199 | symtab_create_debug_printf_v ("recording minsym: %-21s %18s %4d %.*s", |
9675da25 TT |
1200 | mst_str (ms_type), |
1201 | hex_string (LONGEST (address)), | |
1202 | section, (int) name.size (), name.data ()); | |
e08b849e | 1203 | |
8dddcb8f | 1204 | if (m_msym_bunch_index == BUNCH_SIZE) |
c906108c | 1205 | { |
fe978cb0 | 1206 | newobj = XCNEW (struct msym_bunch); |
8dddcb8f TT |
1207 | m_msym_bunch_index = 0; |
1208 | newobj->next = m_msym_bunch; | |
1209 | m_msym_bunch = newobj; | |
c906108c | 1210 | } |
8dddcb8f | 1211 | msymbol = &m_msym_bunch->contents[m_msym_bunch_index]; |
129bce36 | 1212 | msymbol->set_language (language_unknown, |
d3ecddab | 1213 | &m_objfile->per_bfd->storage_obstack); |
5a79c107 TT |
1214 | |
1215 | if (copy_name) | |
4d4eaa30 CB |
1216 | msymbol->m_name = obstack_strndup (&m_objfile->per_bfd->storage_obstack, |
1217 | name.data (), name.size ()); | |
5a79c107 | 1218 | else |
4d4eaa30 | 1219 | msymbol->m_name = name.data (); |
2de7ced7 | 1220 | |
9675da25 | 1221 | msymbol->set_unrelocated_address (address); |
a52d653e | 1222 | msymbol->set_section_index (section); |
714835d5 | 1223 | |
60f62e2b | 1224 | msymbol->set_type (ms_type); |
9227b5eb | 1225 | |
34643a32 TT |
1226 | /* If we already read minimal symbols for this objfile, then don't |
1227 | ever allocate a new one. */ | |
8dddcb8f | 1228 | if (!m_objfile->per_bfd->minsyms_read) |
5f6cac40 | 1229 | { |
8dddcb8f TT |
1230 | m_msym_bunch_index++; |
1231 | m_objfile->per_bfd->n_minsyms++; | |
5f6cac40 | 1232 | } |
8dddcb8f | 1233 | m_msym_count++; |
c906108c SS |
1234 | return msymbol; |
1235 | } | |
1236 | ||
6fb08628 CB |
1237 | /* Compare two minimal symbols by address and return true if FN1's address |
1238 | is less than FN2's, so that we sort into unsigned numeric order. | |
c906108c SS |
1239 | Within groups with the same address, sort by name. */ |
1240 | ||
6fb08628 CB |
1241 | static inline bool |
1242 | minimal_symbol_is_less_than (const minimal_symbol &fn1, | |
1243 | const minimal_symbol &fn2) | |
c906108c | 1244 | { |
93d50cd8 | 1245 | if ((&fn1)->unrelocated_address () < (&fn2)->unrelocated_address ()) |
c906108c | 1246 | { |
6fb08628 | 1247 | return true; /* addr 1 is less than addr 2. */ |
c906108c | 1248 | } |
93d50cd8 | 1249 | else if ((&fn1)->unrelocated_address () > (&fn2)->unrelocated_address ()) |
c906108c | 1250 | { |
6fb08628 | 1251 | return false; /* addr 1 is greater than addr 2. */ |
c906108c | 1252 | } |
c5aa993b JM |
1253 | else |
1254 | /* addrs are equal: sort by name */ | |
c906108c | 1255 | { |
c9d95fa3 CB |
1256 | const char *name1 = fn1.linkage_name (); |
1257 | const char *name2 = fn2.linkage_name (); | |
c906108c SS |
1258 | |
1259 | if (name1 && name2) /* both have names */ | |
6fb08628 | 1260 | return strcmp (name1, name2) < 0; |
c906108c | 1261 | else if (name2) |
6fb08628 | 1262 | return true; /* fn1 has no name, so it is "less". */ |
025bb325 | 1263 | else if (name1) /* fn2 has no name, so it is "less". */ |
6fb08628 | 1264 | return false; |
c906108c | 1265 | else |
6fb08628 | 1266 | return false; /* Neither has a name, so they're equal. */ |
c906108c SS |
1267 | } |
1268 | } | |
1269 | ||
c906108c SS |
1270 | /* Compact duplicate entries out of a minimal symbol table by walking |
1271 | through the table and compacting out entries with duplicate addresses | |
1272 | and matching names. Return the number of entries remaining. | |
1273 | ||
1274 | On entry, the table resides between msymbol[0] and msymbol[mcount]. | |
1275 | On exit, it resides between msymbol[0] and msymbol[result_count]. | |
1276 | ||
1277 | When files contain multiple sources of symbol information, it is | |
1278 | possible for the minimal symbol table to contain many duplicate entries. | |
1279 | As an example, SVR4 systems use ELF formatted object files, which | |
1280 | usually contain at least two different types of symbol tables (a | |
1281 | standard ELF one and a smaller dynamic linking table), as well as | |
1282 | DWARF debugging information for files compiled with -g. | |
1283 | ||
1284 | Without compacting, the minimal symbol table for gdb itself contains | |
1285 | over a 1000 duplicates, about a third of the total table size. Aside | |
1286 | from the potential trap of not noticing that two successive entries | |
1287 | identify the same location, this duplication impacts the time required | |
1288 | to linearly scan the table, which is done in a number of places. So we | |
1289 | just do one linear scan here and toss out the duplicates. | |
1290 | ||
c906108c SS |
1291 | Since the different sources of information for each symbol may |
1292 | have different levels of "completeness", we may have duplicates | |
1293 | that have one entry with type "mst_unknown" and the other with a | |
1294 | known type. So if the one we are leaving alone has type mst_unknown, | |
1295 | overwrite its type with the type from the one we are compacting out. */ | |
1296 | ||
1297 | static int | |
fba45db2 KB |
1298 | compact_minimal_symbols (struct minimal_symbol *msymbol, int mcount, |
1299 | struct objfile *objfile) | |
c906108c SS |
1300 | { |
1301 | struct minimal_symbol *copyfrom; | |
1302 | struct minimal_symbol *copyto; | |
1303 | ||
1304 | if (mcount > 0) | |
1305 | { | |
1306 | copyfrom = copyto = msymbol; | |
1307 | while (copyfrom < msymbol + mcount - 1) | |
1308 | { | |
93d50cd8 TT |
1309 | if (copyfrom->unrelocated_address () |
1310 | == (copyfrom + 1)->unrelocated_address () | |
a52d653e AB |
1311 | && (copyfrom->section_index () |
1312 | == (copyfrom + 1)->section_index ()) | |
c9d95fa3 CB |
1313 | && strcmp (copyfrom->linkage_name (), |
1314 | (copyfrom + 1)->linkage_name ()) == 0) | |
c906108c | 1315 | { |
60f62e2b SM |
1316 | if ((copyfrom + 1)->type () == mst_unknown) |
1317 | (copyfrom + 1)->set_type (copyfrom->type ()); | |
1318 | ||
c906108c SS |
1319 | copyfrom++; |
1320 | } | |
1321 | else | |
afbb8d7a | 1322 | *copyto++ = *copyfrom++; |
c906108c SS |
1323 | } |
1324 | *copyto++ = *copyfrom++; | |
1325 | mcount = copyto - msymbol; | |
1326 | } | |
1327 | return (mcount); | |
1328 | } | |
1329 | ||
808590ec CB |
1330 | static void |
1331 | clear_minimal_symbol_hash_tables (struct objfile *objfile) | |
1332 | { | |
1333 | for (size_t i = 0; i < MINIMAL_SYMBOL_HASH_SIZE; i++) | |
1334 | { | |
1335 | objfile->per_bfd->msymbol_hash[i] = 0; | |
1336 | objfile->per_bfd->msymbol_demangled_hash[i] = 0; | |
1337 | } | |
1338 | } | |
1339 | ||
e76b2246 CB |
1340 | /* This struct is used to store values we compute for msymbols on the |
1341 | background threads but don't need to keep around long term. */ | |
1342 | struct computed_hash_values | |
1343 | { | |
1344 | /* Length of the linkage_name of the symbol. */ | |
1345 | size_t name_length; | |
1346 | /* Hash code (using fast_hash) of the linkage_name. */ | |
1347 | hashval_t mangled_name_hash; | |
f29d7f6b CB |
1348 | /* The msymbol_hash of the linkage_name. */ |
1349 | unsigned int minsym_hash; | |
1350 | /* The msymbol_hash of the search_name. */ | |
1351 | unsigned int minsym_demangled_hash; | |
e76b2246 CB |
1352 | }; |
1353 | ||
afbb8d7a KB |
1354 | /* Build (or rebuild) the minimal symbol hash tables. This is necessary |
1355 | after compacting or sorting the table since the entries move around | |
025bb325 | 1356 | thus causing the internal minimal_symbol pointers to become jumbled. */ |
afbb8d7a KB |
1357 | |
1358 | static void | |
f29d7f6b CB |
1359 | build_minimal_symbol_hash_tables |
1360 | (struct objfile *objfile, | |
1361 | const std::vector<computed_hash_values>& hash_values) | |
afbb8d7a KB |
1362 | { |
1363 | int i; | |
1364 | struct minimal_symbol *msym; | |
1365 | ||
808590ec | 1366 | /* (Re)insert the actual entries. */ |
f29d7f6b CB |
1367 | int mcount = objfile->per_bfd->minimal_symbol_count; |
1368 | for ((i = 0, | |
042d75e4 | 1369 | msym = objfile->per_bfd->msymbols.get ()); |
f29d7f6b CB |
1370 | i < mcount; |
1371 | i++, msym++) | |
afbb8d7a KB |
1372 | { |
1373 | msym->hash_next = 0; | |
f29d7f6b CB |
1374 | add_minsym_to_hash_table (msym, objfile->per_bfd->msymbol_hash, |
1375 | hash_values[i].minsym_hash); | |
afbb8d7a KB |
1376 | |
1377 | msym->demangled_hash_next = 0; | |
c9d95fa3 | 1378 | if (msym->search_name () != msym->linkage_name ()) |
f29d7f6b CB |
1379 | add_minsym_to_demangled_hash_table |
1380 | (msym, objfile, hash_values[i].minsym_demangled_hash); | |
afbb8d7a KB |
1381 | } |
1382 | } | |
1383 | ||
c906108c SS |
1384 | /* Add the minimal symbols in the existing bunches to the objfile's official |
1385 | minimal symbol table. In most cases there is no minimal symbol table yet | |
1386 | for this objfile, and the existing bunches are used to create one. Once | |
1387 | in a while (for shared libraries for example), we add symbols (e.g. common | |
79e7ae11 | 1388 | symbols) to an existing objfile. */ |
c906108c SS |
1389 | |
1390 | void | |
d25e8719 | 1391 | minimal_symbol_reader::install () |
c906108c | 1392 | { |
52f0bd74 AC |
1393 | int mcount; |
1394 | struct msym_bunch *bunch; | |
1395 | struct minimal_symbol *msymbols; | |
c906108c | 1396 | int alloc_count; |
c906108c | 1397 | |
d25e8719 | 1398 | if (m_objfile->per_bfd->minsyms_read) |
34643a32 TT |
1399 | return; |
1400 | ||
8dddcb8f | 1401 | if (m_msym_count > 0) |
c906108c | 1402 | { |
2ab317fb SM |
1403 | symtab_create_debug_printf ("installing %d minimal symbols of objfile %s", |
1404 | m_msym_count, objfile_name (m_objfile)); | |
45cfd468 | 1405 | |
79e7ae11 | 1406 | /* Allocate enough space, into which we will gather the bunches |
dda83cd7 SM |
1407 | of new and existing minimal symbols, sort them, and then |
1408 | compact out the duplicate entries. Once we have a final | |
1409 | table, we will give back the excess space. */ | |
c906108c | 1410 | |
741d7538 | 1411 | alloc_count = m_msym_count + m_objfile->per_bfd->minimal_symbol_count; |
042d75e4 TT |
1412 | gdb::unique_xmalloc_ptr<minimal_symbol> |
1413 | msym_holder (XNEWVEC (minimal_symbol, alloc_count)); | |
1414 | msymbols = msym_holder.get (); | |
c906108c SS |
1415 | |
1416 | /* Copy in the existing minimal symbols, if there are any. */ | |
1417 | ||
d25e8719 | 1418 | if (m_objfile->per_bfd->minimal_symbol_count) |
042d75e4 TT |
1419 | memcpy (msymbols, m_objfile->per_bfd->msymbols.get (), |
1420 | m_objfile->per_bfd->minimal_symbol_count | |
1421 | * sizeof (struct minimal_symbol)); | |
c906108c SS |
1422 | |
1423 | /* Walk through the list of minimal symbol bunches, adding each symbol | |
dda83cd7 SM |
1424 | to the new contiguous array of symbols. Note that we start with the |
1425 | current, possibly partially filled bunch (thus we use the current | |
1426 | msym_bunch_index for the first bunch we copy over), and thereafter | |
1427 | each bunch is full. */ | |
c5aa993b | 1428 | |
d25e8719 | 1429 | mcount = m_objfile->per_bfd->minimal_symbol_count; |
c5aa993b | 1430 | |
8dddcb8f | 1431 | for (bunch = m_msym_bunch; bunch != NULL; bunch = bunch->next) |
c906108c | 1432 | { |
0de2420c TT |
1433 | memcpy (&msymbols[mcount], &bunch->contents[0], |
1434 | m_msym_bunch_index * sizeof (struct minimal_symbol)); | |
1435 | mcount += m_msym_bunch_index; | |
8dddcb8f | 1436 | m_msym_bunch_index = BUNCH_SIZE; |
c906108c SS |
1437 | } |
1438 | ||
1439 | /* Sort the minimal symbols by address. */ | |
c5aa993b | 1440 | |
6fb08628 | 1441 | std::sort (msymbols, msymbols + mcount, minimal_symbol_is_less_than); |
c5aa993b | 1442 | |
c906108c | 1443 | /* Compact out any duplicates, and free up whatever space we are |
dda83cd7 | 1444 | no longer using. */ |
c5aa993b | 1445 | |
d25e8719 | 1446 | mcount = compact_minimal_symbols (msymbols, mcount, m_objfile); |
042d75e4 TT |
1447 | msym_holder.reset (XRESIZEVEC (struct minimal_symbol, |
1448 | msym_holder.release (), | |
1449 | mcount)); | |
c906108c | 1450 | |
c906108c | 1451 | /* Attach the minimal symbol table to the specified objfile. |
dda83cd7 SM |
1452 | The strings themselves are also located in the storage_obstack |
1453 | of this objfile. */ | |
c906108c | 1454 | |
808590ec CB |
1455 | if (m_objfile->per_bfd->minimal_symbol_count != 0) |
1456 | clear_minimal_symbol_hash_tables (m_objfile); | |
1457 | ||
d25e8719 | 1458 | m_objfile->per_bfd->minimal_symbol_count = mcount; |
042d75e4 | 1459 | m_objfile->per_bfd->msymbols = std::move (msym_holder); |
c906108c | 1460 | |
d55c9a68 TT |
1461 | #if CXX_STD_THREAD |
1462 | /* Mutex that is used when modifying or accessing the demangled | |
1463 | hash table. */ | |
1464 | std::mutex demangled_mutex; | |
1465 | #endif | |
1466 | ||
e76b2246 CB |
1467 | std::vector<computed_hash_values> hash_values (mcount); |
1468 | ||
5a79c107 | 1469 | msymbols = m_objfile->per_bfd->msymbols.get (); |
82d734f7 TT |
1470 | /* Arbitrarily require at least 10 elements in a thread. */ |
1471 | gdb::parallel_for_each (10, &msymbols[0], &msymbols[mcount], | |
d55c9a68 TT |
1472 | [&] (minimal_symbol *start, minimal_symbol *end) |
1473 | { | |
1474 | for (minimal_symbol *msym = start; msym < end; ++msym) | |
1475 | { | |
e76b2246 | 1476 | size_t idx = msym - msymbols; |
4d4eaa30 | 1477 | hash_values[idx].name_length = strlen (msym->linkage_name ()); |
d55c9a68 TT |
1478 | if (!msym->name_set) |
1479 | { | |
4d4eaa30 | 1480 | /* This will be freed later, by compute_and_set_names. */ |
3456e70c | 1481 | gdb::unique_xmalloc_ptr<char> demangled_name |
4d4eaa30 | 1482 | = symbol_find_demangled_name (msym, msym->linkage_name ()); |
ff985671 | 1483 | msym->set_demangled_name |
3456e70c TT |
1484 | (demangled_name.release (), |
1485 | &m_objfile->per_bfd->storage_obstack); | |
d55c9a68 TT |
1486 | msym->name_set = 1; |
1487 | } | |
62e77f56 | 1488 | /* This mangled_name_hash computation has to be outside of |
4d4eaa30 | 1489 | the name_set check, or compute_and_set_names below will |
62e77f56 CB |
1490 | be called with an invalid hash value. */ |
1491 | hash_values[idx].mangled_name_hash | |
4d4eaa30 CB |
1492 | = fast_hash (msym->linkage_name (), |
1493 | hash_values[idx].name_length); | |
f29d7f6b CB |
1494 | hash_values[idx].minsym_hash |
1495 | = msymbol_hash (msym->linkage_name ()); | |
1496 | /* We only use this hash code if the search name differs | |
1497 | from the linkage name. See the code in | |
1498 | build_minimal_symbol_hash_tables. */ | |
1499 | if (msym->search_name () != msym->linkage_name ()) | |
1500 | hash_values[idx].minsym_demangled_hash | |
c1b5c1eb | 1501 | = search_name_hash (msym->language (), msym->search_name ()); |
d55c9a68 TT |
1502 | } |
1503 | { | |
1504 | /* To limit how long we hold the lock, we only acquire it here | |
dda83cd7 | 1505 | and not while we demangle the names above. */ |
d55c9a68 TT |
1506 | #if CXX_STD_THREAD |
1507 | std::lock_guard<std::mutex> guard (demangled_mutex); | |
1508 | #endif | |
1509 | for (minimal_symbol *msym = start; msym < end; ++msym) | |
1510 | { | |
e76b2246 | 1511 | size_t idx = msym - msymbols; |
4d4eaa30 | 1512 | msym->compute_and_set_names |
8082468f | 1513 | (std::string_view (msym->linkage_name (), |
4d4eaa30 | 1514 | hash_values[idx].name_length), |
e76b2246 CB |
1515 | false, |
1516 | m_objfile->per_bfd, | |
1517 | hash_values[idx].mangled_name_hash); | |
d55c9a68 TT |
1518 | } |
1519 | } | |
1520 | }); | |
5a79c107 | 1521 | |
f29d7f6b | 1522 | build_minimal_symbol_hash_tables (m_objfile, hash_values); |
c906108c SS |
1523 | } |
1524 | } | |
1525 | ||
c9630d9c TT |
1526 | /* Check if PC is in a shared library trampoline code stub. |
1527 | Return minimal symbol for the trampoline entry or NULL if PC is not | |
1528 | in a trampoline code stub. */ | |
c906108c | 1529 | |
c9630d9c | 1530 | static struct minimal_symbol * |
fba45db2 | 1531 | lookup_solib_trampoline_symbol_by_pc (CORE_ADDR pc) |
c906108c | 1532 | { |
20944a6e PA |
1533 | bound_minimal_symbol msymbol |
1534 | = lookup_minimal_symbol_by_pc_section (pc, NULL, | |
1535 | lookup_msym_prefer::TRAMPOLINE); | |
c906108c | 1536 | |
7cbd4a93 | 1537 | if (msymbol.minsym != NULL |
60f62e2b | 1538 | && msymbol.minsym->type () == mst_solib_trampoline) |
7cbd4a93 | 1539 | return msymbol.minsym; |
c906108c SS |
1540 | return NULL; |
1541 | } | |
1542 | ||
1543 | /* If PC is in a shared library trampoline code stub, return the | |
1544 | address of the `real' function belonging to the stub. | |
1545 | Return 0 if PC is not in a trampoline code stub or if the real | |
1546 | function is not found in the minimal symbol table. | |
1547 | ||
1548 | We may fail to find the right function if a function with the | |
1549 | same name is defined in more than one shared library, but this | |
025bb325 | 1550 | is considered bad programming style. We could return 0 if we find |
c906108c SS |
1551 | a duplicate function in case this matters someday. */ |
1552 | ||
1553 | CORE_ADDR | |
bd2b40ac | 1554 | find_solib_trampoline_target (frame_info_ptr frame, CORE_ADDR pc) |
c906108c | 1555 | { |
c906108c SS |
1556 | struct minimal_symbol *tsymbol = lookup_solib_trampoline_symbol_by_pc (pc); |
1557 | ||
1558 | if (tsymbol != NULL) | |
1559 | { | |
2030c079 | 1560 | for (objfile *objfile : current_program_space->objfiles ()) |
5325b9bf | 1561 | { |
7932255d | 1562 | for (minimal_symbol *msymbol : objfile->msymbols ()) |
5325b9bf TT |
1563 | { |
1564 | /* Also handle minimal symbols pointing to function | |
1565 | descriptors. */ | |
60f62e2b SM |
1566 | if ((msymbol->type () == mst_text |
1567 | || msymbol->type () == mst_text_gnu_ifunc | |
1568 | || msymbol->type () == mst_data | |
1569 | || msymbol->type () == mst_data_gnu_ifunc) | |
c9d95fa3 CB |
1570 | && strcmp (msymbol->linkage_name (), |
1571 | tsymbol->linkage_name ()) == 0) | |
5325b9bf TT |
1572 | { |
1573 | CORE_ADDR func; | |
b8d56208 | 1574 | |
5325b9bf TT |
1575 | /* Ignore data symbols that are not function |
1576 | descriptors. */ | |
1577 | if (msymbol_is_function (objfile, msymbol, &func)) | |
1578 | return func; | |
1579 | } | |
1580 | } | |
1581 | } | |
c906108c SS |
1582 | } |
1583 | return 0; | |
1584 | } | |
50e65b17 TT |
1585 | |
1586 | /* See minsyms.h. */ | |
1587 | ||
1588 | CORE_ADDR | |
1589 | minimal_symbol_upper_bound (struct bound_minimal_symbol minsym) | |
1590 | { | |
50e65b17 TT |
1591 | short section; |
1592 | struct obj_section *obj_section; | |
1593 | CORE_ADDR result; | |
20dc7e9b | 1594 | struct minimal_symbol *iter, *msymbol; |
50e65b17 TT |
1595 | |
1596 | gdb_assert (minsym.minsym != NULL); | |
1597 | ||
1598 | /* If the minimal symbol has a size, use it. Otherwise use the | |
1599 | lesser of the next minimal symbol in the same section, or the end | |
1600 | of the section, as the end of the function. */ | |
1601 | ||
5bbfd12d SM |
1602 | if (minsym.minsym->size () != 0) |
1603 | return minsym.value_address () + minsym.minsym->size (); | |
50e65b17 TT |
1604 | |
1605 | /* Step over other symbols at this same address, and symbols in | |
1606 | other sections, to find the next symbol in this section with a | |
1607 | different address. */ | |
1608 | ||
20dc7e9b PW |
1609 | struct minimal_symbol *past_the_end |
1610 | = (minsym.objfile->per_bfd->msymbols.get () | |
1611 | + minsym.objfile->per_bfd->minimal_symbol_count); | |
50e65b17 | 1612 | msymbol = minsym.minsym; |
a52d653e | 1613 | section = msymbol->section_index (); |
20dc7e9b | 1614 | for (iter = msymbol + 1; iter != past_the_end; ++iter) |
50e65b17 | 1615 | { |
93d50cd8 TT |
1616 | if ((iter->unrelocated_address () |
1617 | != msymbol->unrelocated_address ()) | |
a52d653e | 1618 | && iter->section_index () == section) |
50e65b17 TT |
1619 | break; |
1620 | } | |
1621 | ||
1db66e34 | 1622 | obj_section = minsym.obj_section (); |
20dc7e9b | 1623 | if (iter != past_the_end |
4aeddc50 | 1624 | && (iter->value_address (minsym.objfile) |
0c1bcd23 | 1625 | < obj_section->endaddr ())) |
4aeddc50 | 1626 | result = iter->value_address (minsym.objfile); |
50e65b17 TT |
1627 | else |
1628 | /* We got the start address from the last msymbol in the objfile. | |
1629 | So the end address is the end of the section. */ | |
0c1bcd23 | 1630 | result = obj_section->endaddr (); |
50e65b17 TT |
1631 | |
1632 | return result; | |
1633 | } | |
005b65e8 TT |
1634 | |
1635 | /* See minsyms.h. */ | |
1636 | ||
1637 | type * | |
1638 | find_minsym_type_and_address (minimal_symbol *msymbol, | |
1639 | struct objfile *objfile, | |
1640 | CORE_ADDR *address_p) | |
1641 | { | |
1642 | bound_minimal_symbol bound_msym = {msymbol, objfile}; | |
1643 | struct obj_section *section = msymbol->obj_section (objfile); | |
1644 | enum minimal_symbol_type type = msymbol->type (); | |
1645 | ||
1646 | bool is_tls = (section != NULL | |
1647 | && section->the_bfd_section->flags & SEC_THREAD_LOCAL); | |
1648 | ||
1649 | /* The minimal symbol might point to a function descriptor; | |
1650 | resolve it to the actual code address instead. */ | |
1651 | CORE_ADDR addr; | |
1652 | if (is_tls) | |
1653 | { | |
1654 | /* Addresses of TLS symbols are really offsets into a | |
1655 | per-objfile/per-thread storage block. */ | |
1656 | addr = CORE_ADDR (bound_msym.minsym->unrelocated_address ()); | |
1657 | } | |
1658 | else if (msymbol_is_function (objfile, msymbol, &addr)) | |
1659 | { | |
1660 | if (addr != bound_msym.value_address ()) | |
1661 | { | |
1662 | /* This means we resolved a function descriptor, and we now | |
1663 | have an address for a code/text symbol instead of a data | |
1664 | symbol. */ | |
1665 | if (msymbol->type () == mst_data_gnu_ifunc) | |
1666 | type = mst_text_gnu_ifunc; | |
1667 | else | |
1668 | type = mst_text; | |
1669 | section = NULL; | |
1670 | } | |
1671 | } | |
1672 | else | |
1673 | addr = bound_msym.value_address (); | |
1674 | ||
1675 | if (overlay_debugging) | |
1676 | addr = symbol_overlayed_address (addr, section); | |
1677 | ||
1678 | if (is_tls) | |
1679 | { | |
1680 | /* Skip translation if caller does not need the address. */ | |
1681 | if (address_p != NULL) | |
1682 | *address_p = target_translate_tls_address (objfile, addr); | |
1683 | return builtin_type (objfile)->nodebug_tls_symbol; | |
1684 | } | |
1685 | ||
1686 | if (address_p != NULL) | |
1687 | *address_p = addr; | |
1688 | ||
1689 | switch (type) | |
1690 | { | |
1691 | case mst_text: | |
1692 | case mst_file_text: | |
1693 | case mst_solib_trampoline: | |
1694 | return builtin_type (objfile)->nodebug_text_symbol; | |
1695 | ||
1696 | case mst_text_gnu_ifunc: | |
1697 | return builtin_type (objfile)->nodebug_text_gnu_ifunc_symbol; | |
1698 | ||
1699 | case mst_data: | |
1700 | case mst_file_data: | |
1701 | case mst_bss: | |
1702 | case mst_file_bss: | |
1703 | return builtin_type (objfile)->nodebug_data_symbol; | |
1704 | ||
1705 | case mst_slot_got_plt: | |
1706 | return builtin_type (objfile)->nodebug_got_plt_symbol; | |
1707 | ||
1708 | default: | |
1709 | return builtin_type (objfile)->nodebug_unknown_symbol; | |
1710 | } | |
1711 | } |