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c906108c | 1 | /* GDB routines for manipulating the minimal symbol tables. |
197e01b6 | 2 | Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, |
6aba47ca | 3 | 2002, 2003, 2004, 2007 Free Software Foundation, Inc. |
c906108c SS |
4 | Contributed by Cygnus Support, using pieces from other GDB modules. |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
c906108c SS |
22 | |
23 | ||
24 | /* This file contains support routines for creating, manipulating, and | |
25 | destroying minimal symbol tables. | |
26 | ||
27 | Minimal symbol tables are used to hold some very basic information about | |
28 | all defined global symbols (text, data, bss, abs, etc). The only two | |
29 | required pieces of information are the symbol's name and the address | |
30 | associated with that symbol. | |
31 | ||
32 | In many cases, even if a file was compiled with no special options for | |
33 | debugging at all, as long as was not stripped it will contain sufficient | |
34 | information to build useful minimal symbol tables using this structure. | |
c5aa993b | 35 | |
c906108c SS |
36 | Even when a file contains enough debugging information to build a full |
37 | symbol table, these minimal symbols are still useful for quickly mapping | |
38 | between names and addresses, and vice versa. They are also sometimes used | |
39 | to figure out what full symbol table entries need to be read in. */ | |
40 | ||
41 | ||
42 | #include "defs.h" | |
9227b5eb | 43 | #include <ctype.h> |
c906108c SS |
44 | #include "gdb_string.h" |
45 | #include "symtab.h" | |
46 | #include "bfd.h" | |
47 | #include "symfile.h" | |
48 | #include "objfiles.h" | |
49 | #include "demangle.h" | |
7ed49443 JB |
50 | #include "value.h" |
51 | #include "cp-abi.h" | |
c906108c SS |
52 | |
53 | /* Accumulate the minimal symbols for each objfile in bunches of BUNCH_SIZE. | |
54 | At the end, copy them all into one newly allocated location on an objfile's | |
55 | symbol obstack. */ | |
56 | ||
57 | #define BUNCH_SIZE 127 | |
58 | ||
59 | struct msym_bunch | |
c5aa993b JM |
60 | { |
61 | struct msym_bunch *next; | |
62 | struct minimal_symbol contents[BUNCH_SIZE]; | |
63 | }; | |
c906108c SS |
64 | |
65 | /* Bunch currently being filled up. | |
66 | The next field points to chain of filled bunches. */ | |
67 | ||
68 | static struct msym_bunch *msym_bunch; | |
69 | ||
70 | /* Number of slots filled in current bunch. */ | |
71 | ||
72 | static int msym_bunch_index; | |
73 | ||
74 | /* Total number of minimal symbols recorded so far for the objfile. */ | |
75 | ||
76 | static int msym_count; | |
77 | ||
9227b5eb JB |
78 | /* Compute a hash code based using the same criteria as `strcmp_iw'. */ |
79 | ||
80 | unsigned int | |
81 | msymbol_hash_iw (const char *string) | |
82 | { | |
83 | unsigned int hash = 0; | |
84 | while (*string && *string != '(') | |
85 | { | |
86 | while (isspace (*string)) | |
87 | ++string; | |
88 | if (*string && *string != '(') | |
375f3d86 DJ |
89 | { |
90 | hash = hash * 67 + *string - 113; | |
91 | ++string; | |
92 | } | |
9227b5eb | 93 | } |
261397f8 | 94 | return hash; |
9227b5eb JB |
95 | } |
96 | ||
97 | /* Compute a hash code for a string. */ | |
98 | ||
99 | unsigned int | |
100 | msymbol_hash (const char *string) | |
101 | { | |
102 | unsigned int hash = 0; | |
103 | for (; *string; ++string) | |
375f3d86 | 104 | hash = hash * 67 + *string - 113; |
261397f8 | 105 | return hash; |
9227b5eb JB |
106 | } |
107 | ||
108 | /* Add the minimal symbol SYM to an objfile's minsym hash table, TABLE. */ | |
109 | void | |
110 | add_minsym_to_hash_table (struct minimal_symbol *sym, | |
111 | struct minimal_symbol **table) | |
112 | { | |
113 | if (sym->hash_next == NULL) | |
114 | { | |
f56f77c1 DC |
115 | unsigned int hash |
116 | = msymbol_hash (SYMBOL_LINKAGE_NAME (sym)) % MINIMAL_SYMBOL_HASH_SIZE; | |
9227b5eb JB |
117 | sym->hash_next = table[hash]; |
118 | table[hash] = sym; | |
119 | } | |
120 | } | |
121 | ||
0729fd50 DB |
122 | /* Add the minimal symbol SYM to an objfile's minsym demangled hash table, |
123 | TABLE. */ | |
124 | static void | |
125 | add_minsym_to_demangled_hash_table (struct minimal_symbol *sym, | |
126 | struct minimal_symbol **table) | |
127 | { | |
128 | if (sym->demangled_hash_next == NULL) | |
129 | { | |
261397f8 | 130 | unsigned int hash = msymbol_hash_iw (SYMBOL_DEMANGLED_NAME (sym)) % MINIMAL_SYMBOL_HASH_SIZE; |
0729fd50 DB |
131 | sym->demangled_hash_next = table[hash]; |
132 | table[hash] = sym; | |
133 | } | |
134 | } | |
135 | ||
c906108c SS |
136 | |
137 | /* Look through all the current minimal symbol tables and find the | |
138 | first minimal symbol that matches NAME. If OBJF is non-NULL, limit | |
72a5efb3 DJ |
139 | the search to that objfile. If SFILE is non-NULL, the only file-scope |
140 | symbols considered will be from that source file (global symbols are | |
141 | still preferred). Returns a pointer to the minimal symbol that | |
c906108c SS |
142 | matches, or NULL if no match is found. |
143 | ||
144 | Note: One instance where there may be duplicate minimal symbols with | |
145 | the same name is when the symbol tables for a shared library and the | |
146 | symbol tables for an executable contain global symbols with the same | |
d73f140a JB |
147 | names (the dynamic linker deals with the duplication). |
148 | ||
149 | It's also possible to have minimal symbols with different mangled | |
150 | names, but identical demangled names. For example, the GNU C++ v3 | |
151 | ABI requires the generation of two (or perhaps three) copies of | |
152 | constructor functions --- "in-charge", "not-in-charge", and | |
153 | "allocate" copies; destructors may be duplicated as well. | |
154 | Obviously, there must be distinct mangled names for each of these, | |
155 | but the demangled names are all the same: S::S or S::~S. */ | |
c906108c SS |
156 | |
157 | struct minimal_symbol * | |
aa1ee363 | 158 | lookup_minimal_symbol (const char *name, const char *sfile, |
fba45db2 | 159 | struct objfile *objf) |
c906108c SS |
160 | { |
161 | struct objfile *objfile; | |
162 | struct minimal_symbol *msymbol; | |
163 | struct minimal_symbol *found_symbol = NULL; | |
164 | struct minimal_symbol *found_file_symbol = NULL; | |
165 | struct minimal_symbol *trampoline_symbol = NULL; | |
166 | ||
261397f8 DJ |
167 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
168 | unsigned int dem_hash = msymbol_hash_iw (name) % MINIMAL_SYMBOL_HASH_SIZE; | |
9227b5eb | 169 | |
c906108c SS |
170 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
171 | if (sfile != NULL) | |
172 | { | |
173 | char *p = strrchr (sfile, '/'); | |
174 | if (p != NULL) | |
175 | sfile = p + 1; | |
176 | } | |
177 | #endif | |
178 | ||
179 | for (objfile = object_files; | |
180 | objfile != NULL && found_symbol == NULL; | |
c5aa993b | 181 | objfile = objfile->next) |
c906108c SS |
182 | { |
183 | if (objf == NULL || objf == objfile) | |
184 | { | |
9227b5eb JB |
185 | /* Do two passes: the first over the ordinary hash table, |
186 | and the second over the demangled hash table. */ | |
0729fd50 | 187 | int pass; |
9227b5eb | 188 | |
0729fd50 | 189 | for (pass = 1; pass <= 2 && found_symbol == NULL; pass++) |
c906108c | 190 | { |
0729fd50 DB |
191 | /* Select hash list according to pass. */ |
192 | if (pass == 1) | |
193 | msymbol = objfile->msymbol_hash[hash]; | |
194 | else | |
195 | msymbol = objfile->msymbol_demangled_hash[dem_hash]; | |
196 | ||
197 | while (msymbol != NULL && found_symbol == NULL) | |
c906108c | 198 | { |
e06963ff AC |
199 | /* FIXME: carlton/2003-02-27: This is an unholy |
200 | mixture of linkage names and natural names. If | |
201 | you want to test the linkage names with strcmp, | |
202 | do that. If you want to test the natural names | |
203 | with strcmp_iw, use SYMBOL_MATCHES_NATURAL_NAME. */ | |
204 | if (strcmp (DEPRECATED_SYMBOL_NAME (msymbol), (name)) == 0 | |
205 | || (SYMBOL_DEMANGLED_NAME (msymbol) != NULL | |
206 | && strcmp_iw (SYMBOL_DEMANGLED_NAME (msymbol), | |
207 | (name)) == 0)) | |
c906108c | 208 | { |
0729fd50 DB |
209 | switch (MSYMBOL_TYPE (msymbol)) |
210 | { | |
211 | case mst_file_text: | |
212 | case mst_file_data: | |
213 | case mst_file_bss: | |
c906108c | 214 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
6314a349 AC |
215 | if (sfile == NULL |
216 | || strcmp (msymbol->filename, sfile) == 0) | |
0729fd50 | 217 | found_file_symbol = msymbol; |
c906108c | 218 | #else |
0729fd50 DB |
219 | /* We have neither the ability nor the need to |
220 | deal with the SFILE parameter. If we find | |
221 | more than one symbol, just return the latest | |
222 | one (the user can't expect useful behavior in | |
223 | that case). */ | |
224 | found_file_symbol = msymbol; | |
c906108c | 225 | #endif |
0729fd50 DB |
226 | break; |
227 | ||
228 | case mst_solib_trampoline: | |
229 | ||
230 | /* If a trampoline symbol is found, we prefer to | |
231 | keep looking for the *real* symbol. If the | |
232 | actual symbol is not found, then we'll use the | |
233 | trampoline entry. */ | |
234 | if (trampoline_symbol == NULL) | |
235 | trampoline_symbol = msymbol; | |
236 | break; | |
237 | ||
238 | case mst_unknown: | |
239 | default: | |
240 | found_symbol = msymbol; | |
241 | break; | |
242 | } | |
c906108c | 243 | } |
9227b5eb | 244 | |
0729fd50 DB |
245 | /* Find the next symbol on the hash chain. */ |
246 | if (pass == 1) | |
247 | msymbol = msymbol->hash_next; | |
248 | else | |
249 | msymbol = msymbol->demangled_hash_next; | |
9227b5eb | 250 | } |
c906108c SS |
251 | } |
252 | } | |
253 | } | |
254 | /* External symbols are best. */ | |
255 | if (found_symbol) | |
256 | return found_symbol; | |
257 | ||
258 | /* File-local symbols are next best. */ | |
259 | if (found_file_symbol) | |
260 | return found_file_symbol; | |
261 | ||
262 | /* Symbols for shared library trampolines are next best. */ | |
263 | if (trampoline_symbol) | |
264 | return trampoline_symbol; | |
265 | ||
266 | return NULL; | |
267 | } | |
268 | ||
269 | /* Look through all the current minimal symbol tables and find the | |
72a5efb3 | 270 | first minimal symbol that matches NAME and has text type. If OBJF |
5520a790 EZ |
271 | is non-NULL, limit the search to that objfile. Returns a pointer |
272 | to the minimal symbol that matches, or NULL if no match is found. | |
72a5efb3 DJ |
273 | |
274 | This function only searches the mangled (linkage) names. */ | |
c5aa993b | 275 | |
c906108c | 276 | struct minimal_symbol * |
5520a790 | 277 | lookup_minimal_symbol_text (const char *name, struct objfile *objf) |
c906108c SS |
278 | { |
279 | struct objfile *objfile; | |
280 | struct minimal_symbol *msymbol; | |
281 | struct minimal_symbol *found_symbol = NULL; | |
282 | struct minimal_symbol *found_file_symbol = NULL; | |
283 | ||
72a5efb3 DJ |
284 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
285 | ||
c906108c SS |
286 | for (objfile = object_files; |
287 | objfile != NULL && found_symbol == NULL; | |
c5aa993b | 288 | objfile = objfile->next) |
c906108c SS |
289 | { |
290 | if (objf == NULL || objf == objfile) | |
291 | { | |
72a5efb3 DJ |
292 | for (msymbol = objfile->msymbol_hash[hash]; |
293 | msymbol != NULL && found_symbol == NULL; | |
294 | msymbol = msymbol->hash_next) | |
c906108c | 295 | { |
f56f77c1 | 296 | if (strcmp (SYMBOL_LINKAGE_NAME (msymbol), name) == 0 && |
c906108c SS |
297 | (MSYMBOL_TYPE (msymbol) == mst_text || |
298 | MSYMBOL_TYPE (msymbol) == mst_file_text)) | |
299 | { | |
300 | switch (MSYMBOL_TYPE (msymbol)) | |
301 | { | |
302 | case mst_file_text: | |
c906108c | 303 | found_file_symbol = msymbol; |
c906108c SS |
304 | break; |
305 | default: | |
306 | found_symbol = msymbol; | |
307 | break; | |
308 | } | |
309 | } | |
310 | } | |
311 | } | |
312 | } | |
313 | /* External symbols are best. */ | |
314 | if (found_symbol) | |
315 | return found_symbol; | |
316 | ||
317 | /* File-local symbols are next best. */ | |
318 | if (found_file_symbol) | |
319 | return found_file_symbol; | |
320 | ||
321 | return NULL; | |
322 | } | |
323 | ||
324 | /* Look through all the current minimal symbol tables and find the | |
5520a790 EZ |
325 | first minimal symbol that matches NAME and is a solib trampoline. |
326 | If OBJF is non-NULL, limit the search to that objfile. Returns a | |
327 | pointer to the minimal symbol that matches, or NULL if no match is | |
328 | found. | |
72a5efb3 DJ |
329 | |
330 | This function only searches the mangled (linkage) names. */ | |
c5aa993b | 331 | |
c906108c | 332 | struct minimal_symbol * |
aa1ee363 | 333 | lookup_minimal_symbol_solib_trampoline (const char *name, |
aa1ee363 | 334 | struct objfile *objf) |
c906108c SS |
335 | { |
336 | struct objfile *objfile; | |
337 | struct minimal_symbol *msymbol; | |
338 | struct minimal_symbol *found_symbol = NULL; | |
339 | ||
72a5efb3 DJ |
340 | unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE; |
341 | ||
c906108c SS |
342 | for (objfile = object_files; |
343 | objfile != NULL && found_symbol == NULL; | |
c5aa993b | 344 | objfile = objfile->next) |
c906108c SS |
345 | { |
346 | if (objf == NULL || objf == objfile) | |
347 | { | |
72a5efb3 DJ |
348 | for (msymbol = objfile->msymbol_hash[hash]; |
349 | msymbol != NULL && found_symbol == NULL; | |
350 | msymbol = msymbol->hash_next) | |
c906108c | 351 | { |
f56f77c1 | 352 | if (strcmp (SYMBOL_LINKAGE_NAME (msymbol), name) == 0 && |
c906108c SS |
353 | MSYMBOL_TYPE (msymbol) == mst_solib_trampoline) |
354 | return msymbol; | |
355 | } | |
356 | } | |
357 | } | |
358 | ||
359 | return NULL; | |
360 | } | |
361 | ||
c906108c SS |
362 | /* Search through the minimal symbol table for each objfile and find |
363 | the symbol whose address is the largest address that is still less | |
43b54b88 | 364 | than or equal to PC, and matches SECTION (if non-NULL). Returns a |
c906108c SS |
365 | pointer to the minimal symbol if such a symbol is found, or NULL if |
366 | PC is not in a suitable range. Note that we need to look through | |
367 | ALL the minimal symbol tables before deciding on the symbol that | |
368 | comes closest to the specified PC. This is because objfiles can | |
369 | overlap, for example objfile A has .text at 0x100 and .data at | |
370 | 0x40000 and objfile B has .text at 0x234 and .data at 0x40048. */ | |
371 | ||
372 | struct minimal_symbol * | |
fba45db2 | 373 | lookup_minimal_symbol_by_pc_section (CORE_ADDR pc, asection *section) |
c906108c SS |
374 | { |
375 | int lo; | |
376 | int hi; | |
377 | int new; | |
378 | struct objfile *objfile; | |
379 | struct minimal_symbol *msymbol; | |
380 | struct minimal_symbol *best_symbol = NULL; | |
64ae9269 | 381 | struct obj_section *pc_section; |
c906108c | 382 | |
43b54b88 AC |
383 | /* PC has to be in a known section. This ensures that anything |
384 | beyond the end of the last segment doesn't appear to be part of | |
385 | the last function in the last segment. */ | |
64ae9269 DJ |
386 | pc_section = find_pc_section (pc); |
387 | if (pc_section == NULL) | |
c906108c SS |
388 | return NULL; |
389 | ||
43b54b88 AC |
390 | /* NOTE: cagney/2004-01-27: Removed code (added 2003-07-19) that was |
391 | trying to force the PC into a valid section as returned by | |
392 | find_pc_section. It broke IRIX 6.5 mdebug which relies on this | |
393 | code returning an absolute symbol - the problem was that | |
394 | find_pc_section wasn't returning an absolute section and hence | |
395 | the code below would skip over absolute symbols. Since the | |
396 | original problem was with finding a frame's function, and that | |
397 | uses [indirectly] lookup_minimal_symbol_by_pc, the original | |
398 | problem has been fixed by having that function use | |
399 | find_pc_section. */ | |
64ae9269 | 400 | |
c906108c SS |
401 | for (objfile = object_files; |
402 | objfile != NULL; | |
c5aa993b | 403 | objfile = objfile->next) |
c906108c SS |
404 | { |
405 | /* If this objfile has a minimal symbol table, go search it using | |
c5aa993b JM |
406 | a binary search. Note that a minimal symbol table always consists |
407 | of at least two symbols, a "real" symbol and the terminating | |
408 | "null symbol". If there are no real symbols, then there is no | |
409 | minimal symbol table at all. */ | |
c906108c | 410 | |
15831452 | 411 | if (objfile->minimal_symbol_count > 0) |
c906108c | 412 | { |
29e8a844 DJ |
413 | int best_zero_sized = -1; |
414 | ||
15831452 | 415 | msymbol = objfile->msymbols; |
c906108c | 416 | lo = 0; |
c5aa993b | 417 | hi = objfile->minimal_symbol_count - 1; |
c906108c SS |
418 | |
419 | /* This code assumes that the minimal symbols are sorted by | |
420 | ascending address values. If the pc value is greater than or | |
421 | equal to the first symbol's address, then some symbol in this | |
422 | minimal symbol table is a suitable candidate for being the | |
423 | "best" symbol. This includes the last real symbol, for cases | |
424 | where the pc value is larger than any address in this vector. | |
425 | ||
426 | By iterating until the address associated with the current | |
427 | hi index (the endpoint of the test interval) is less than | |
428 | or equal to the desired pc value, we accomplish two things: | |
429 | (1) the case where the pc value is larger than any minimal | |
430 | symbol address is trivially solved, (2) the address associated | |
431 | with the hi index is always the one we want when the interation | |
432 | terminates. In essence, we are iterating the test interval | |
433 | down until the pc value is pushed out of it from the high end. | |
434 | ||
435 | Warning: this code is trickier than it would appear at first. */ | |
436 | ||
437 | /* Should also require that pc is <= end of objfile. FIXME! */ | |
438 | if (pc >= SYMBOL_VALUE_ADDRESS (&msymbol[lo])) | |
439 | { | |
440 | while (SYMBOL_VALUE_ADDRESS (&msymbol[hi]) > pc) | |
441 | { | |
442 | /* pc is still strictly less than highest address */ | |
443 | /* Note "new" will always be >= lo */ | |
444 | new = (lo + hi) / 2; | |
445 | if ((SYMBOL_VALUE_ADDRESS (&msymbol[new]) >= pc) || | |
446 | (lo == new)) | |
447 | { | |
448 | hi = new; | |
449 | } | |
450 | else | |
451 | { | |
452 | lo = new; | |
453 | } | |
454 | } | |
455 | ||
456 | /* If we have multiple symbols at the same address, we want | |
c5aa993b JM |
457 | hi to point to the last one. That way we can find the |
458 | right symbol if it has an index greater than hi. */ | |
459 | while (hi < objfile->minimal_symbol_count - 1 | |
c906108c | 460 | && (SYMBOL_VALUE_ADDRESS (&msymbol[hi]) |
c5aa993b | 461 | == SYMBOL_VALUE_ADDRESS (&msymbol[hi + 1]))) |
c906108c SS |
462 | hi++; |
463 | ||
29e8a844 DJ |
464 | /* Skip various undesirable symbols. */ |
465 | while (hi >= 0) | |
466 | { | |
467 | /* Skip any absolute symbols. This is apparently | |
468 | what adb and dbx do, and is needed for the CM-5. | |
469 | There are two known possible problems: (1) on | |
470 | ELF, apparently end, edata, etc. are absolute. | |
471 | Not sure ignoring them here is a big deal, but if | |
472 | we want to use them, the fix would go in | |
473 | elfread.c. (2) I think shared library entry | |
474 | points on the NeXT are absolute. If we want | |
475 | special handling for this it probably should be | |
476 | triggered by a special mst_abs_or_lib or some | |
477 | such. */ | |
478 | ||
479 | if (msymbol[hi].type == mst_abs) | |
480 | { | |
481 | hi--; | |
482 | continue; | |
483 | } | |
484 | ||
485 | /* If SECTION was specified, skip any symbol from | |
486 | wrong section. */ | |
487 | if (section | |
488 | /* Some types of debug info, such as COFF, | |
489 | don't fill the bfd_section member, so don't | |
490 | throw away symbols on those platforms. */ | |
491 | && SYMBOL_BFD_SECTION (&msymbol[hi]) != NULL | |
94277a38 DJ |
492 | && (!matching_bfd_sections |
493 | (SYMBOL_BFD_SECTION (&msymbol[hi]), section))) | |
29e8a844 DJ |
494 | { |
495 | hi--; | |
496 | continue; | |
497 | } | |
498 | ||
499 | /* If the minimal symbol has a zero size, save it | |
500 | but keep scanning backwards looking for one with | |
501 | a non-zero size. A zero size may mean that the | |
502 | symbol isn't an object or function (e.g. a | |
503 | label), or it may just mean that the size was not | |
504 | specified. */ | |
505 | if (MSYMBOL_SIZE (&msymbol[hi]) == 0 | |
506 | && best_zero_sized == -1) | |
507 | { | |
508 | best_zero_sized = hi; | |
509 | hi--; | |
510 | continue; | |
511 | } | |
512 | ||
513 | /* Otherwise, this symbol must be as good as we're going | |
514 | to get. */ | |
515 | break; | |
516 | } | |
517 | ||
518 | /* If HI has a zero size, and best_zero_sized is set, | |
519 | then we had two or more zero-sized symbols; prefer | |
520 | the first one we found (which may have a higher | |
521 | address). Also, if we ran off the end, be sure | |
522 | to back up. */ | |
523 | if (best_zero_sized != -1 | |
524 | && (hi < 0 || MSYMBOL_SIZE (&msymbol[hi]) == 0)) | |
525 | hi = best_zero_sized; | |
526 | ||
527 | /* If the minimal symbol has a non-zero size, and this | |
528 | PC appears to be outside the symbol's contents, then | |
529 | refuse to use this symbol. If we found a zero-sized | |
530 | symbol with an address greater than this symbol's, | |
531 | use that instead. We assume that if symbols have | |
532 | specified sizes, they do not overlap. */ | |
533 | ||
534 | if (hi >= 0 | |
535 | && MSYMBOL_SIZE (&msymbol[hi]) != 0 | |
536 | && pc >= (SYMBOL_VALUE_ADDRESS (&msymbol[hi]) | |
537 | + MSYMBOL_SIZE (&msymbol[hi]))) | |
538 | { | |
539 | if (best_zero_sized != -1) | |
540 | hi = best_zero_sized; | |
541 | else | |
542 | /* Go on to the next object file. */ | |
543 | continue; | |
544 | } | |
545 | ||
c906108c | 546 | /* The minimal symbol indexed by hi now is the best one in this |
c5aa993b JM |
547 | objfile's minimal symbol table. See if it is the best one |
548 | overall. */ | |
c906108c | 549 | |
c906108c SS |
550 | if (hi >= 0 |
551 | && ((best_symbol == NULL) || | |
c5aa993b | 552 | (SYMBOL_VALUE_ADDRESS (best_symbol) < |
c906108c SS |
553 | SYMBOL_VALUE_ADDRESS (&msymbol[hi])))) |
554 | { | |
555 | best_symbol = &msymbol[hi]; | |
556 | } | |
557 | } | |
558 | } | |
559 | } | |
560 | return (best_symbol); | |
561 | } | |
562 | ||
563 | /* Backward compatibility: search through the minimal symbol table | |
564 | for a matching PC (no section given) */ | |
565 | ||
566 | struct minimal_symbol * | |
fba45db2 | 567 | lookup_minimal_symbol_by_pc (CORE_ADDR pc) |
c906108c | 568 | { |
43b54b88 AC |
569 | /* NOTE: cagney/2004-01-27: This was using find_pc_mapped_section to |
570 | force the section but that (well unless you're doing overlay | |
571 | debugging) always returns NULL making the call somewhat useless. */ | |
572 | struct obj_section *section = find_pc_section (pc); | |
573 | if (section == NULL) | |
574 | return NULL; | |
575 | return lookup_minimal_symbol_by_pc_section (pc, section->the_bfd_section); | |
c906108c | 576 | } |
c906108c | 577 | \f |
c5aa993b | 578 | |
c906108c SS |
579 | /* Return leading symbol character for a BFD. If BFD is NULL, |
580 | return the leading symbol character from the main objfile. */ | |
581 | ||
a14ed312 | 582 | static int get_symbol_leading_char (bfd *); |
c906108c SS |
583 | |
584 | static int | |
fba45db2 | 585 | get_symbol_leading_char (bfd *abfd) |
c906108c SS |
586 | { |
587 | if (abfd != NULL) | |
588 | return bfd_get_symbol_leading_char (abfd); | |
589 | if (symfile_objfile != NULL && symfile_objfile->obfd != NULL) | |
590 | return bfd_get_symbol_leading_char (symfile_objfile->obfd); | |
591 | return 0; | |
592 | } | |
593 | ||
594 | /* Prepare to start collecting minimal symbols. Note that presetting | |
595 | msym_bunch_index to BUNCH_SIZE causes the first call to save a minimal | |
596 | symbol to allocate the memory for the first bunch. */ | |
597 | ||
598 | void | |
fba45db2 | 599 | init_minimal_symbol_collection (void) |
c906108c SS |
600 | { |
601 | msym_count = 0; | |
602 | msym_bunch = NULL; | |
603 | msym_bunch_index = BUNCH_SIZE; | |
604 | } | |
605 | ||
606 | void | |
fba45db2 KB |
607 | prim_record_minimal_symbol (const char *name, CORE_ADDR address, |
608 | enum minimal_symbol_type ms_type, | |
609 | struct objfile *objfile) | |
c906108c SS |
610 | { |
611 | int section; | |
612 | ||
613 | switch (ms_type) | |
614 | { | |
615 | case mst_text: | |
616 | case mst_file_text: | |
617 | case mst_solib_trampoline: | |
b8fbeb18 | 618 | section = SECT_OFF_TEXT (objfile); |
c906108c SS |
619 | break; |
620 | case mst_data: | |
621 | case mst_file_data: | |
b8fbeb18 | 622 | section = SECT_OFF_DATA (objfile); |
c906108c SS |
623 | break; |
624 | case mst_bss: | |
625 | case mst_file_bss: | |
b8fbeb18 | 626 | section = SECT_OFF_BSS (objfile); |
c906108c SS |
627 | break; |
628 | default: | |
629 | section = -1; | |
630 | } | |
631 | ||
632 | prim_record_minimal_symbol_and_info (name, address, ms_type, | |
633 | NULL, section, NULL, objfile); | |
634 | } | |
635 | ||
636 | /* Record a minimal symbol in the msym bunches. Returns the symbol | |
637 | newly created. */ | |
638 | ||
639 | struct minimal_symbol * | |
fba45db2 KB |
640 | prim_record_minimal_symbol_and_info (const char *name, CORE_ADDR address, |
641 | enum minimal_symbol_type ms_type, | |
642 | char *info, int section, | |
643 | asection *bfd_section, | |
644 | struct objfile *objfile) | |
c906108c | 645 | { |
52f0bd74 AC |
646 | struct msym_bunch *new; |
647 | struct minimal_symbol *msymbol; | |
c906108c | 648 | |
66337bb1 CV |
649 | /* Don't put gcc_compiled, __gnu_compiled_cplus, and friends into |
650 | the minimal symbols, because if there is also another symbol | |
651 | at the same address (e.g. the first function of the file), | |
652 | lookup_minimal_symbol_by_pc would have no way of getting the | |
653 | right one. */ | |
654 | if (ms_type == mst_file_text && name[0] == 'g' | |
655 | && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0 | |
656 | || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0)) | |
657 | return (NULL); | |
658 | ||
659 | /* It's safe to strip the leading char here once, since the name | |
660 | is also stored stripped in the minimal symbol table. */ | |
661 | if (name[0] == get_symbol_leading_char (objfile->obfd)) | |
662 | ++name; | |
663 | ||
664 | if (ms_type == mst_file_text && strncmp (name, "__gnu_compiled", 14) == 0) | |
665 | return (NULL); | |
c906108c SS |
666 | |
667 | if (msym_bunch_index == BUNCH_SIZE) | |
668 | { | |
669 | new = (struct msym_bunch *) xmalloc (sizeof (struct msym_bunch)); | |
670 | msym_bunch_index = 0; | |
c5aa993b | 671 | new->next = msym_bunch; |
c906108c SS |
672 | msym_bunch = new; |
673 | } | |
c5aa993b | 674 | msymbol = &msym_bunch->contents[msym_bunch_index]; |
c906108c | 675 | SYMBOL_INIT_LANGUAGE_SPECIFIC (msymbol, language_unknown); |
2de7ced7 DJ |
676 | SYMBOL_LANGUAGE (msymbol) = language_auto; |
677 | SYMBOL_SET_NAMES (msymbol, (char *)name, strlen (name), objfile); | |
678 | ||
c906108c SS |
679 | SYMBOL_VALUE_ADDRESS (msymbol) = address; |
680 | SYMBOL_SECTION (msymbol) = section; | |
681 | SYMBOL_BFD_SECTION (msymbol) = bfd_section; | |
682 | ||
683 | MSYMBOL_TYPE (msymbol) = ms_type; | |
684 | /* FIXME: This info, if it remains, needs its own field. */ | |
c5aa993b | 685 | MSYMBOL_INFO (msymbol) = info; /* FIXME! */ |
f594e5e9 | 686 | MSYMBOL_SIZE (msymbol) = 0; |
9227b5eb | 687 | |
a79dea61 | 688 | /* The hash pointers must be cleared! If they're not, |
72a0cf8f | 689 | add_minsym_to_hash_table will NOT add this msymbol to the hash table. */ |
9227b5eb JB |
690 | msymbol->hash_next = NULL; |
691 | msymbol->demangled_hash_next = NULL; | |
692 | ||
c906108c SS |
693 | msym_bunch_index++; |
694 | msym_count++; | |
695 | OBJSTAT (objfile, n_minsyms++); | |
696 | return msymbol; | |
697 | } | |
698 | ||
699 | /* Compare two minimal symbols by address and return a signed result based | |
700 | on unsigned comparisons, so that we sort into unsigned numeric order. | |
701 | Within groups with the same address, sort by name. */ | |
702 | ||
703 | static int | |
12b9c64f | 704 | compare_minimal_symbols (const void *fn1p, const void *fn2p) |
c906108c | 705 | { |
52f0bd74 AC |
706 | const struct minimal_symbol *fn1; |
707 | const struct minimal_symbol *fn2; | |
c906108c SS |
708 | |
709 | fn1 = (const struct minimal_symbol *) fn1p; | |
710 | fn2 = (const struct minimal_symbol *) fn2p; | |
711 | ||
712 | if (SYMBOL_VALUE_ADDRESS (fn1) < SYMBOL_VALUE_ADDRESS (fn2)) | |
713 | { | |
c5aa993b | 714 | return (-1); /* addr 1 is less than addr 2 */ |
c906108c SS |
715 | } |
716 | else if (SYMBOL_VALUE_ADDRESS (fn1) > SYMBOL_VALUE_ADDRESS (fn2)) | |
717 | { | |
c5aa993b | 718 | return (1); /* addr 1 is greater than addr 2 */ |
c906108c | 719 | } |
c5aa993b JM |
720 | else |
721 | /* addrs are equal: sort by name */ | |
c906108c | 722 | { |
f56f77c1 DC |
723 | char *name1 = SYMBOL_LINKAGE_NAME (fn1); |
724 | char *name2 = SYMBOL_LINKAGE_NAME (fn2); | |
c906108c SS |
725 | |
726 | if (name1 && name2) /* both have names */ | |
727 | return strcmp (name1, name2); | |
728 | else if (name2) | |
c5aa993b JM |
729 | return 1; /* fn1 has no name, so it is "less" */ |
730 | else if (name1) /* fn2 has no name, so it is "less" */ | |
c906108c SS |
731 | return -1; |
732 | else | |
c5aa993b | 733 | return (0); /* neither has a name, so they're equal. */ |
c906108c SS |
734 | } |
735 | } | |
736 | ||
737 | /* Discard the currently collected minimal symbols, if any. If we wish | |
738 | to save them for later use, we must have already copied them somewhere | |
739 | else before calling this function. | |
740 | ||
741 | FIXME: We could allocate the minimal symbol bunches on their own | |
742 | obstack and then simply blow the obstack away when we are done with | |
743 | it. Is it worth the extra trouble though? */ | |
744 | ||
56e290f4 AC |
745 | static void |
746 | do_discard_minimal_symbols_cleanup (void *arg) | |
c906108c | 747 | { |
52f0bd74 | 748 | struct msym_bunch *next; |
c906108c SS |
749 | |
750 | while (msym_bunch != NULL) | |
751 | { | |
c5aa993b | 752 | next = msym_bunch->next; |
b8c9b27d | 753 | xfree (msym_bunch); |
c906108c SS |
754 | msym_bunch = next; |
755 | } | |
756 | } | |
757 | ||
56e290f4 AC |
758 | struct cleanup * |
759 | make_cleanup_discard_minimal_symbols (void) | |
760 | { | |
761 | return make_cleanup (do_discard_minimal_symbols_cleanup, 0); | |
762 | } | |
763 | ||
764 | ||
9227b5eb | 765 | |
c906108c SS |
766 | /* Compact duplicate entries out of a minimal symbol table by walking |
767 | through the table and compacting out entries with duplicate addresses | |
768 | and matching names. Return the number of entries remaining. | |
769 | ||
770 | On entry, the table resides between msymbol[0] and msymbol[mcount]. | |
771 | On exit, it resides between msymbol[0] and msymbol[result_count]. | |
772 | ||
773 | When files contain multiple sources of symbol information, it is | |
774 | possible for the minimal symbol table to contain many duplicate entries. | |
775 | As an example, SVR4 systems use ELF formatted object files, which | |
776 | usually contain at least two different types of symbol tables (a | |
777 | standard ELF one and a smaller dynamic linking table), as well as | |
778 | DWARF debugging information for files compiled with -g. | |
779 | ||
780 | Without compacting, the minimal symbol table for gdb itself contains | |
781 | over a 1000 duplicates, about a third of the total table size. Aside | |
782 | from the potential trap of not noticing that two successive entries | |
783 | identify the same location, this duplication impacts the time required | |
784 | to linearly scan the table, which is done in a number of places. So we | |
785 | just do one linear scan here and toss out the duplicates. | |
786 | ||
787 | Note that we are not concerned here about recovering the space that | |
788 | is potentially freed up, because the strings themselves are allocated | |
4a146b47 | 789 | on the objfile_obstack, and will get automatically freed when the symbol |
c906108c SS |
790 | table is freed. The caller can free up the unused minimal symbols at |
791 | the end of the compacted region if their allocation strategy allows it. | |
792 | ||
793 | Also note we only go up to the next to last entry within the loop | |
794 | and then copy the last entry explicitly after the loop terminates. | |
795 | ||
796 | Since the different sources of information for each symbol may | |
797 | have different levels of "completeness", we may have duplicates | |
798 | that have one entry with type "mst_unknown" and the other with a | |
799 | known type. So if the one we are leaving alone has type mst_unknown, | |
800 | overwrite its type with the type from the one we are compacting out. */ | |
801 | ||
802 | static int | |
fba45db2 KB |
803 | compact_minimal_symbols (struct minimal_symbol *msymbol, int mcount, |
804 | struct objfile *objfile) | |
c906108c SS |
805 | { |
806 | struct minimal_symbol *copyfrom; | |
807 | struct minimal_symbol *copyto; | |
808 | ||
809 | if (mcount > 0) | |
810 | { | |
811 | copyfrom = copyto = msymbol; | |
812 | while (copyfrom < msymbol + mcount - 1) | |
813 | { | |
6314a349 AC |
814 | if (SYMBOL_VALUE_ADDRESS (copyfrom) |
815 | == SYMBOL_VALUE_ADDRESS ((copyfrom + 1)) | |
816 | && strcmp (SYMBOL_LINKAGE_NAME (copyfrom), | |
817 | SYMBOL_LINKAGE_NAME ((copyfrom + 1))) == 0) | |
c906108c | 818 | { |
c5aa993b | 819 | if (MSYMBOL_TYPE ((copyfrom + 1)) == mst_unknown) |
c906108c SS |
820 | { |
821 | MSYMBOL_TYPE ((copyfrom + 1)) = MSYMBOL_TYPE (copyfrom); | |
822 | } | |
823 | copyfrom++; | |
824 | } | |
825 | else | |
afbb8d7a | 826 | *copyto++ = *copyfrom++; |
c906108c SS |
827 | } |
828 | *copyto++ = *copyfrom++; | |
829 | mcount = copyto - msymbol; | |
830 | } | |
831 | return (mcount); | |
832 | } | |
833 | ||
afbb8d7a KB |
834 | /* Build (or rebuild) the minimal symbol hash tables. This is necessary |
835 | after compacting or sorting the table since the entries move around | |
836 | thus causing the internal minimal_symbol pointers to become jumbled. */ | |
837 | ||
838 | static void | |
839 | build_minimal_symbol_hash_tables (struct objfile *objfile) | |
840 | { | |
841 | int i; | |
842 | struct minimal_symbol *msym; | |
843 | ||
844 | /* Clear the hash tables. */ | |
845 | for (i = 0; i < MINIMAL_SYMBOL_HASH_SIZE; i++) | |
846 | { | |
847 | objfile->msymbol_hash[i] = 0; | |
848 | objfile->msymbol_demangled_hash[i] = 0; | |
849 | } | |
850 | ||
851 | /* Now, (re)insert the actual entries. */ | |
852 | for (i = objfile->minimal_symbol_count, msym = objfile->msymbols; | |
853 | i > 0; | |
854 | i--, msym++) | |
855 | { | |
856 | msym->hash_next = 0; | |
857 | add_minsym_to_hash_table (msym, objfile->msymbol_hash); | |
858 | ||
859 | msym->demangled_hash_next = 0; | |
4725b721 | 860 | if (SYMBOL_SEARCH_NAME (msym) != SYMBOL_LINKAGE_NAME (msym)) |
afbb8d7a KB |
861 | add_minsym_to_demangled_hash_table (msym, |
862 | objfile->msymbol_demangled_hash); | |
863 | } | |
864 | } | |
865 | ||
c906108c SS |
866 | /* Add the minimal symbols in the existing bunches to the objfile's official |
867 | minimal symbol table. In most cases there is no minimal symbol table yet | |
868 | for this objfile, and the existing bunches are used to create one. Once | |
869 | in a while (for shared libraries for example), we add symbols (e.g. common | |
870 | symbols) to an existing objfile. | |
871 | ||
872 | Because of the way minimal symbols are collected, we generally have no way | |
873 | of knowing what source language applies to any particular minimal symbol. | |
874 | Specifically, we have no way of knowing if the minimal symbol comes from a | |
875 | C++ compilation unit or not. So for the sake of supporting cached | |
876 | demangled C++ names, we have no choice but to try and demangle each new one | |
877 | that comes in. If the demangling succeeds, then we assume it is a C++ | |
878 | symbol and set the symbol's language and demangled name fields | |
879 | appropriately. Note that in order to avoid unnecessary demanglings, and | |
880 | allocating obstack space that subsequently can't be freed for the demangled | |
881 | names, we mark all newly added symbols with language_auto. After | |
882 | compaction of the minimal symbols, we go back and scan the entire minimal | |
883 | symbol table looking for these new symbols. For each new symbol we attempt | |
884 | to demangle it, and if successful, record it as a language_cplus symbol | |
885 | and cache the demangled form on the symbol obstack. Symbols which don't | |
886 | demangle are marked as language_unknown symbols, which inhibits future | |
887 | attempts to demangle them if we later add more minimal symbols. */ | |
888 | ||
889 | void | |
fba45db2 | 890 | install_minimal_symbols (struct objfile *objfile) |
c906108c | 891 | { |
52f0bd74 AC |
892 | int bindex; |
893 | int mcount; | |
894 | struct msym_bunch *bunch; | |
895 | struct minimal_symbol *msymbols; | |
c906108c | 896 | int alloc_count; |
c906108c SS |
897 | |
898 | if (msym_count > 0) | |
899 | { | |
900 | /* Allocate enough space in the obstack, into which we will gather the | |
c5aa993b JM |
901 | bunches of new and existing minimal symbols, sort them, and then |
902 | compact out the duplicate entries. Once we have a final table, | |
903 | we will give back the excess space. */ | |
c906108c SS |
904 | |
905 | alloc_count = msym_count + objfile->minimal_symbol_count + 1; | |
4a146b47 | 906 | obstack_blank (&objfile->objfile_obstack, |
c906108c SS |
907 | alloc_count * sizeof (struct minimal_symbol)); |
908 | msymbols = (struct minimal_symbol *) | |
4a146b47 | 909 | obstack_base (&objfile->objfile_obstack); |
c906108c SS |
910 | |
911 | /* Copy in the existing minimal symbols, if there are any. */ | |
912 | ||
913 | if (objfile->minimal_symbol_count) | |
c5aa993b JM |
914 | memcpy ((char *) msymbols, (char *) objfile->msymbols, |
915 | objfile->minimal_symbol_count * sizeof (struct minimal_symbol)); | |
c906108c SS |
916 | |
917 | /* Walk through the list of minimal symbol bunches, adding each symbol | |
c5aa993b JM |
918 | to the new contiguous array of symbols. Note that we start with the |
919 | current, possibly partially filled bunch (thus we use the current | |
920 | msym_bunch_index for the first bunch we copy over), and thereafter | |
921 | each bunch is full. */ | |
922 | ||
c906108c | 923 | mcount = objfile->minimal_symbol_count; |
c5aa993b JM |
924 | |
925 | for (bunch = msym_bunch; bunch != NULL; bunch = bunch->next) | |
c906108c SS |
926 | { |
927 | for (bindex = 0; bindex < msym_bunch_index; bindex++, mcount++) | |
66337bb1 | 928 | msymbols[mcount] = bunch->contents[bindex]; |
c906108c SS |
929 | msym_bunch_index = BUNCH_SIZE; |
930 | } | |
931 | ||
932 | /* Sort the minimal symbols by address. */ | |
c5aa993b | 933 | |
c906108c SS |
934 | qsort (msymbols, mcount, sizeof (struct minimal_symbol), |
935 | compare_minimal_symbols); | |
c5aa993b | 936 | |
c906108c | 937 | /* Compact out any duplicates, and free up whatever space we are |
c5aa993b JM |
938 | no longer using. */ |
939 | ||
9227b5eb | 940 | mcount = compact_minimal_symbols (msymbols, mcount, objfile); |
c906108c | 941 | |
4a146b47 | 942 | obstack_blank (&objfile->objfile_obstack, |
c5aa993b | 943 | (mcount + 1 - alloc_count) * sizeof (struct minimal_symbol)); |
c906108c | 944 | msymbols = (struct minimal_symbol *) |
4a146b47 | 945 | obstack_finish (&objfile->objfile_obstack); |
c906108c SS |
946 | |
947 | /* We also terminate the minimal symbol table with a "null symbol", | |
c5aa993b JM |
948 | which is *not* included in the size of the table. This makes it |
949 | easier to find the end of the table when we are handed a pointer | |
950 | to some symbol in the middle of it. Zero out the fields in the | |
951 | "null symbol" allocated at the end of the array. Note that the | |
952 | symbol count does *not* include this null symbol, which is why it | |
953 | is indexed by mcount and not mcount-1. */ | |
c906108c | 954 | |
f56f77c1 | 955 | SYMBOL_LINKAGE_NAME (&msymbols[mcount]) = NULL; |
c906108c SS |
956 | SYMBOL_VALUE_ADDRESS (&msymbols[mcount]) = 0; |
957 | MSYMBOL_INFO (&msymbols[mcount]) = NULL; | |
f594e5e9 | 958 | MSYMBOL_SIZE (&msymbols[mcount]) = 0; |
c906108c SS |
959 | MSYMBOL_TYPE (&msymbols[mcount]) = mst_unknown; |
960 | SYMBOL_INIT_LANGUAGE_SPECIFIC (&msymbols[mcount], language_unknown); | |
961 | ||
962 | /* Attach the minimal symbol table to the specified objfile. | |
4a146b47 | 963 | The strings themselves are also located in the objfile_obstack |
c5aa993b | 964 | of this objfile. */ |
c906108c | 965 | |
c5aa993b JM |
966 | objfile->minimal_symbol_count = mcount; |
967 | objfile->msymbols = msymbols; | |
c906108c | 968 | |
7ed49443 JB |
969 | /* Try to guess the appropriate C++ ABI by looking at the names |
970 | of the minimal symbols in the table. */ | |
971 | { | |
972 | int i; | |
973 | ||
974 | for (i = 0; i < mcount; i++) | |
975 | { | |
6aca59a3 DJ |
976 | /* If a symbol's name starts with _Z and was successfully |
977 | demangled, then we can assume we've found a GNU v3 symbol. | |
978 | For now we set the C++ ABI globally; if the user is | |
979 | mixing ABIs then the user will need to "set cp-abi" | |
980 | manually. */ | |
f56f77c1 | 981 | const char *name = SYMBOL_LINKAGE_NAME (&objfile->msymbols[i]); |
6aca59a3 DJ |
982 | if (name[0] == '_' && name[1] == 'Z' |
983 | && SYMBOL_DEMANGLED_NAME (&objfile->msymbols[i]) != NULL) | |
7ed49443 | 984 | { |
fe1f4a5e | 985 | set_cp_abi_as_auto_default ("gnu-v3"); |
7ed49443 JB |
986 | break; |
987 | } | |
988 | } | |
989 | } | |
afbb8d7a KB |
990 | |
991 | /* Now build the hash tables; we can't do this incrementally | |
992 | at an earlier point since we weren't finished with the obstack | |
993 | yet. (And if the msymbol obstack gets moved, all the internal | |
994 | pointers to other msymbols need to be adjusted.) */ | |
995 | build_minimal_symbol_hash_tables (objfile); | |
c906108c SS |
996 | } |
997 | } | |
998 | ||
999 | /* Sort all the minimal symbols in OBJFILE. */ | |
1000 | ||
1001 | void | |
fba45db2 | 1002 | msymbols_sort (struct objfile *objfile) |
c906108c SS |
1003 | { |
1004 | qsort (objfile->msymbols, objfile->minimal_symbol_count, | |
1005 | sizeof (struct minimal_symbol), compare_minimal_symbols); | |
afbb8d7a | 1006 | build_minimal_symbol_hash_tables (objfile); |
c906108c SS |
1007 | } |
1008 | ||
1009 | /* Check if PC is in a shared library trampoline code stub. | |
1010 | Return minimal symbol for the trampoline entry or NULL if PC is not | |
1011 | in a trampoline code stub. */ | |
1012 | ||
1013 | struct minimal_symbol * | |
fba45db2 | 1014 | lookup_solib_trampoline_symbol_by_pc (CORE_ADDR pc) |
c906108c SS |
1015 | { |
1016 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (pc); | |
1017 | ||
1018 | if (msymbol != NULL && MSYMBOL_TYPE (msymbol) == mst_solib_trampoline) | |
1019 | return msymbol; | |
1020 | return NULL; | |
1021 | } | |
1022 | ||
1023 | /* If PC is in a shared library trampoline code stub, return the | |
1024 | address of the `real' function belonging to the stub. | |
1025 | Return 0 if PC is not in a trampoline code stub or if the real | |
1026 | function is not found in the minimal symbol table. | |
1027 | ||
1028 | We may fail to find the right function if a function with the | |
1029 | same name is defined in more than one shared library, but this | |
1030 | is considered bad programming style. We could return 0 if we find | |
1031 | a duplicate function in case this matters someday. */ | |
1032 | ||
1033 | CORE_ADDR | |
fba45db2 | 1034 | find_solib_trampoline_target (CORE_ADDR pc) |
c906108c SS |
1035 | { |
1036 | struct objfile *objfile; | |
1037 | struct minimal_symbol *msymbol; | |
1038 | struct minimal_symbol *tsymbol = lookup_solib_trampoline_symbol_by_pc (pc); | |
1039 | ||
1040 | if (tsymbol != NULL) | |
1041 | { | |
1042 | ALL_MSYMBOLS (objfile, msymbol) | |
c5aa993b JM |
1043 | { |
1044 | if (MSYMBOL_TYPE (msymbol) == mst_text | |
6314a349 AC |
1045 | && strcmp (SYMBOL_LINKAGE_NAME (msymbol), |
1046 | SYMBOL_LINKAGE_NAME (tsymbol)) == 0) | |
c5aa993b JM |
1047 | return SYMBOL_VALUE_ADDRESS (msymbol); |
1048 | } | |
c906108c SS |
1049 | } |
1050 | return 0; | |
1051 | } |