Commit | Line | Data |
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c906108c | 1 | /* GDB routines for manipulating objfiles. |
af5f3db6 | 2 | |
0b302171 | 3 | Copyright (C) 1992-2004, 2007-2012 Free Software Foundation, Inc. |
af5f3db6 | 4 | |
c906108c SS |
5 | Contributed by Cygnus Support, using pieces from other GDB modules. |
6 | ||
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
21 | |
22 | /* This file contains support routines for creating, manipulating, and | |
0df8b418 | 23 | destroying objfile structures. */ |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "bfd.h" /* Binary File Description */ | |
27 | #include "symtab.h" | |
28 | #include "symfile.h" | |
29 | #include "objfiles.h" | |
30 | #include "gdb-stabs.h" | |
31 | #include "target.h" | |
af5f3db6 | 32 | #include "bcache.h" |
5b123146 | 33 | #include "mdebugread.h" |
9bdcbae7 DJ |
34 | #include "expression.h" |
35 | #include "parser-defs.h" | |
36 | ||
0d0e1a63 | 37 | #include "gdb_assert.h" |
c906108c SS |
38 | #include <sys/types.h> |
39 | #include "gdb_stat.h" | |
40 | #include <fcntl.h> | |
04ea0df1 | 41 | #include "gdb_obstack.h" |
c906108c | 42 | #include "gdb_string.h" |
2de7ced7 | 43 | #include "hashtab.h" |
c906108c | 44 | |
7a292a7a | 45 | #include "breakpoint.h" |
fe898f56 | 46 | #include "block.h" |
de4f826b | 47 | #include "dictionary.h" |
cb5d864f | 48 | #include "source.h" |
801e3a5b | 49 | #include "addrmap.h" |
5e2b427d | 50 | #include "arch-utils.h" |
30510692 | 51 | #include "exec.h" |
a845f5cb | 52 | #include "observer.h" |
6fbf07cd | 53 | #include "complaints.h" |
ccefe4c4 | 54 | #include "psymtab.h" |
0133421a | 55 | #include "solist.h" |
cbb099e8 | 56 | #include "gdb_bfd.h" |
7a292a7a | 57 | |
8e260fc0 TT |
58 | /* Keep a registry of per-objfile data-pointers required by other GDB |
59 | modules. */ | |
c906108c | 60 | |
6b81941e | 61 | DEFINE_REGISTRY (objfile, REGISTRY_ACCESS_FIELD) |
0d0e1a63 | 62 | |
c906108c | 63 | /* Externally visible variables that are owned by this module. |
0df8b418 | 64 | See declarations in objfile.h for more info. */ |
c906108c | 65 | |
c906108c SS |
66 | struct objfile *rt_common_objfile; /* For runtime common symbols */ |
67 | ||
6c95b8df PA |
68 | struct objfile_pspace_info |
69 | { | |
70 | int objfiles_changed_p; | |
71 | struct obj_section **sections; | |
72 | int num_sections; | |
73 | }; | |
74 | ||
75 | /* Per-program-space data key. */ | |
76 | static const struct program_space_data *objfiles_pspace_data; | |
77 | ||
78 | static void | |
79 | objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
80 | { | |
81 | struct objfile_pspace_info *info; | |
82 | ||
83 | info = program_space_data (pspace, objfiles_pspace_data); | |
84 | if (info != NULL) | |
85 | { | |
86 | xfree (info->sections); | |
87 | xfree (info); | |
88 | } | |
89 | } | |
90 | ||
91 | /* Get the current svr4 data. If none is found yet, add it now. This | |
92 | function always returns a valid object. */ | |
93 | ||
94 | static struct objfile_pspace_info * | |
95 | get_objfile_pspace_data (struct program_space *pspace) | |
96 | { | |
97 | struct objfile_pspace_info *info; | |
98 | ||
99 | info = program_space_data (pspace, objfiles_pspace_data); | |
100 | if (info == NULL) | |
101 | { | |
102 | info = XZALLOC (struct objfile_pspace_info); | |
103 | set_program_space_data (pspace, objfiles_pspace_data, info); | |
104 | } | |
105 | ||
106 | return info; | |
107 | } | |
108 | ||
96baa820 JM |
109 | /* Called via bfd_map_over_sections to build up the section table that |
110 | the objfile references. The objfile contains pointers to the start | |
111 | of the table (objfile->sections) and to the first location after | |
0df8b418 | 112 | the end of the table (objfile->sections_end). */ |
96baa820 | 113 | |
c906108c | 114 | static void |
7be0c536 | 115 | add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect, |
d82ea6a8 | 116 | void *objfilep) |
c906108c | 117 | { |
d82ea6a8 | 118 | struct objfile *objfile = (struct objfile *) objfilep; |
c906108c SS |
119 | struct obj_section section; |
120 | flagword aflag; | |
121 | ||
122 | aflag = bfd_get_section_flags (abfd, asect); | |
ed7c5e43 | 123 | if (!(aflag & SEC_ALLOC)) |
c906108c | 124 | return; |
d82ea6a8 | 125 | if (bfd_section_size (abfd, asect) == 0) |
c906108c | 126 | return; |
d82ea6a8 | 127 | |
c906108c SS |
128 | section.objfile = objfile; |
129 | section.the_bfd_section = asect; | |
130 | section.ovly_mapped = 0; | |
3e43a32a MS |
131 | obstack_grow (&objfile->objfile_obstack, |
132 | (char *) §ion, sizeof (section)); | |
f1f6aadf PA |
133 | objfile->sections_end |
134 | = (struct obj_section *) (((size_t) objfile->sections_end) + 1); | |
c906108c SS |
135 | } |
136 | ||
137 | /* Builds a section table for OBJFILE. | |
96baa820 JM |
138 | |
139 | Note that while we are building the table, which goes into the | |
d82ea6a8 | 140 | objfile obstack, we hijack the sections_end pointer to instead hold |
96baa820 JM |
141 | a count of the number of sections. When bfd_map_over_sections |
142 | returns, this count is used to compute the pointer to the end of | |
143 | the sections table, which then overwrites the count. | |
144 | ||
145 | Also note that the OFFSET and OVLY_MAPPED in each table entry | |
146 | are initialized to zero. | |
147 | ||
d82ea6a8 | 148 | Also note that if anything else writes to the objfile obstack while |
0df8b418 | 149 | we are building the table, we're pretty much hosed. */ |
c906108c | 150 | |
d82ea6a8 | 151 | void |
fba45db2 | 152 | build_objfile_section_table (struct objfile *objfile) |
c906108c | 153 | { |
c906108c | 154 | objfile->sections_end = 0; |
f1f6aadf PA |
155 | bfd_map_over_sections (objfile->obfd, |
156 | add_to_objfile_sections, (void *) objfile); | |
157 | objfile->sections = obstack_finish (&objfile->objfile_obstack); | |
158 | objfile->sections_end = objfile->sections + (size_t) objfile->sections_end; | |
c906108c SS |
159 | } |
160 | ||
2df3850c JM |
161 | /* Given a pointer to an initialized bfd (ABFD) and some flag bits |
162 | allocate a new objfile struct, fill it in as best we can, link it | |
163 | into the list of all known objfiles, and return a pointer to the | |
164 | new objfile struct. | |
c906108c | 165 | |
2df3850c | 166 | The FLAGS word contains various bits (OBJF_*) that can be taken as |
78a4a9b9 | 167 | requests for specific operations. Other bits like OBJF_SHARED are |
0df8b418 | 168 | simply copied through to the new objfile flags member. */ |
c906108c | 169 | |
eb9a305d DC |
170 | /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0 |
171 | by jv-lang.c, to create an artificial objfile used to hold | |
172 | information about dynamically-loaded Java classes. Unfortunately, | |
173 | that branch of this function doesn't get tested very frequently, so | |
174 | it's prone to breakage. (E.g. at one time the name was set to NULL | |
175 | in that situation, which broke a loop over all names in the dynamic | |
176 | library loader.) If you change this function, please try to leave | |
177 | things in a consistent state even if abfd is NULL. */ | |
178 | ||
c906108c | 179 | struct objfile * |
fba45db2 | 180 | allocate_objfile (bfd *abfd, int flags) |
c906108c | 181 | { |
2f6e5d7e | 182 | struct objfile *objfile; |
c906108c | 183 | |
6a0fa043 | 184 | objfile = (struct objfile *) xzalloc (sizeof (struct objfile)); |
710e1a31 | 185 | objfile->psymbol_cache = psymbol_bcache_init (); |
cbd70537 SW |
186 | objfile->macro_cache = bcache_xmalloc (NULL, NULL); |
187 | objfile->filename_cache = bcache_xmalloc (NULL, NULL); | |
2f6e5d7e TG |
188 | /* We could use obstack_specify_allocation here instead, but |
189 | gdb_obstack.h specifies the alloc/dealloc functions. */ | |
190 | obstack_init (&objfile->objfile_obstack); | |
191 | terminate_minimal_symbol_table (objfile); | |
c906108c | 192 | |
0d0e1a63 MK |
193 | objfile_alloc_data (objfile); |
194 | ||
c906108c SS |
195 | /* Update the per-objfile information that comes from the bfd, ensuring |
196 | that any data that is reference is saved in the per-objfile data | |
8ac244b4 | 197 | region. */ |
c906108c | 198 | |
cbb099e8 | 199 | objfile->obfd = abfd; |
8ac244b4 | 200 | gdb_bfd_ref (abfd); |
c906108c SS |
201 | if (abfd != NULL) |
202 | { | |
5e2b427d UW |
203 | /* Look up the gdbarch associated with the BFD. */ |
204 | objfile->gdbarch = gdbarch_from_bfd (abfd); | |
205 | ||
982526a1 | 206 | objfile->name = xstrdup (bfd_get_filename (abfd)); |
c5aa993b | 207 | objfile->mtime = bfd_get_mtime (abfd); |
c906108c SS |
208 | |
209 | /* Build section table. */ | |
d82ea6a8 | 210 | build_objfile_section_table (objfile); |
c906108c | 211 | } |
eb9a305d DC |
212 | else |
213 | { | |
982526a1 | 214 | objfile->name = xstrdup ("<<anonymous objfile>>"); |
eb9a305d | 215 | } |
c906108c | 216 | |
6c95b8df PA |
217 | objfile->pspace = current_program_space; |
218 | ||
b8fbeb18 | 219 | /* Initialize the section indexes for this objfile, so that we can |
0df8b418 | 220 | later detect if they are used w/o being properly assigned to. */ |
b8fbeb18 | 221 | |
5c4e30ca DC |
222 | objfile->sect_index_text = -1; |
223 | objfile->sect_index_data = -1; | |
224 | objfile->sect_index_bss = -1; | |
225 | objfile->sect_index_rodata = -1; | |
226 | ||
0df8b418 | 227 | /* Add this file onto the tail of the linked list of other such files. */ |
c906108c | 228 | |
c5aa993b | 229 | objfile->next = NULL; |
c906108c SS |
230 | if (object_files == NULL) |
231 | object_files = objfile; | |
232 | else | |
233 | { | |
2f6e5d7e TG |
234 | struct objfile *last_one; |
235 | ||
c906108c | 236 | for (last_one = object_files; |
c5aa993b JM |
237 | last_one->next; |
238 | last_one = last_one->next); | |
239 | last_one->next = objfile; | |
c906108c SS |
240 | } |
241 | ||
0df8b418 | 242 | /* Save passed in flag bits. */ |
2df3850c | 243 | objfile->flags |= flags; |
c906108c | 244 | |
6c95b8df PA |
245 | /* Rebuild section map next time we need it. */ |
246 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; | |
bb272892 | 247 | |
6c95b8df | 248 | return objfile; |
c906108c SS |
249 | } |
250 | ||
5e2b427d UW |
251 | /* Retrieve the gdbarch associated with OBJFILE. */ |
252 | struct gdbarch * | |
253 | get_objfile_arch (struct objfile *objfile) | |
254 | { | |
255 | return objfile->gdbarch; | |
256 | } | |
257 | ||
0df8b418 | 258 | /* Initialize entry point information for this objfile. */ |
9ab9195f EZ |
259 | |
260 | void | |
261 | init_entry_point_info (struct objfile *objfile) | |
262 | { | |
263 | /* Save startup file's range of PC addresses to help blockframe.c | |
264 | decide where the bottom of the stack is. */ | |
265 | ||
266 | if (bfd_get_file_flags (objfile->obfd) & EXEC_P) | |
267 | { | |
268 | /* Executable file -- record its entry point so we'll recognize | |
269 | the startup file because it contains the entry point. */ | |
270 | objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); | |
abd0a5fa | 271 | objfile->ei.entry_point_p = 1; |
9ab9195f | 272 | } |
574dffa2 DJ |
273 | else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC |
274 | && bfd_get_start_address (objfile->obfd) != 0) | |
abd0a5fa JK |
275 | { |
276 | /* Some shared libraries may have entry points set and be | |
277 | runnable. There's no clear way to indicate this, so just check | |
278 | for values other than zero. */ | |
279 | objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); | |
280 | objfile->ei.entry_point_p = 1; | |
281 | } | |
9ab9195f EZ |
282 | else |
283 | { | |
284 | /* Examination of non-executable.o files. Short-circuit this stuff. */ | |
abd0a5fa | 285 | objfile->ei.entry_point_p = 0; |
9ab9195f | 286 | } |
9ab9195f EZ |
287 | } |
288 | ||
abd0a5fa JK |
289 | /* If there is a valid and known entry point, function fills *ENTRY_P with it |
290 | and returns non-zero; otherwise it returns zero. */ | |
9ab9195f | 291 | |
abd0a5fa JK |
292 | int |
293 | entry_point_address_query (CORE_ADDR *entry_p) | |
9ab9195f | 294 | { |
3612b192 DJ |
295 | struct gdbarch *gdbarch; |
296 | CORE_ADDR entry_point; | |
297 | ||
abd0a5fa | 298 | if (symfile_objfile == NULL || !symfile_objfile->ei.entry_point_p) |
3612b192 DJ |
299 | return 0; |
300 | ||
301 | gdbarch = get_objfile_arch (symfile_objfile); | |
302 | ||
303 | entry_point = symfile_objfile->ei.entry_point; | |
304 | ||
305 | /* Make certain that the address points at real code, and not a | |
306 | function descriptor. */ | |
307 | entry_point = gdbarch_convert_from_func_ptr_addr (gdbarch, entry_point, | |
308 | ¤t_target); | |
309 | ||
310 | /* Remove any ISA markers, so that this matches entries in the | |
311 | symbol table. */ | |
312 | entry_point = gdbarch_addr_bits_remove (gdbarch, entry_point); | |
313 | ||
abd0a5fa JK |
314 | *entry_p = entry_point; |
315 | return 1; | |
316 | } | |
317 | ||
318 | /* Get current entry point address. Call error if it is not known. */ | |
319 | ||
320 | CORE_ADDR | |
321 | entry_point_address (void) | |
322 | { | |
323 | CORE_ADDR retval; | |
324 | ||
325 | if (!entry_point_address_query (&retval)) | |
326 | error (_("Entry point address is not known.")); | |
327 | ||
328 | return retval; | |
9ab9195f | 329 | } |
15831452 | 330 | |
15d123c9 TG |
331 | /* Iterator on PARENT and every separate debug objfile of PARENT. |
332 | The usage pattern is: | |
333 | for (objfile = parent; | |
334 | objfile; | |
335 | objfile = objfile_separate_debug_iterate (parent, objfile)) | |
336 | ... | |
337 | */ | |
338 | ||
339 | struct objfile * | |
340 | objfile_separate_debug_iterate (const struct objfile *parent, | |
341 | const struct objfile *objfile) | |
342 | { | |
343 | struct objfile *res; | |
344 | ||
399f313b | 345 | /* If any, return the first child. */ |
15d123c9 TG |
346 | res = objfile->separate_debug_objfile; |
347 | if (res) | |
348 | return res; | |
349 | ||
15d123c9 TG |
350 | /* Common case where there is no separate debug objfile. */ |
351 | if (objfile == parent) | |
352 | return NULL; | |
353 | ||
399f313b TG |
354 | /* Return the brother if any. Note that we don't iterate on brothers of |
355 | the parents. */ | |
356 | res = objfile->separate_debug_objfile_link; | |
357 | if (res) | |
358 | return res; | |
359 | ||
15d123c9 TG |
360 | for (res = objfile->separate_debug_objfile_backlink; |
361 | res != parent; | |
362 | res = res->separate_debug_objfile_backlink) | |
363 | { | |
364 | gdb_assert (res != NULL); | |
365 | if (res->separate_debug_objfile_link) | |
366 | return res->separate_debug_objfile_link; | |
367 | } | |
368 | return NULL; | |
369 | } | |
15831452 | 370 | |
5b5d99cf JB |
371 | /* Put one object file before a specified on in the global list. |
372 | This can be used to make sure an object file is destroyed before | |
0df8b418 | 373 | another when using ALL_OBJFILES_SAFE to free all objfiles. */ |
5b5d99cf JB |
374 | void |
375 | put_objfile_before (struct objfile *objfile, struct objfile *before_this) | |
376 | { | |
377 | struct objfile **objp; | |
378 | ||
379 | unlink_objfile (objfile); | |
380 | ||
381 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
382 | { | |
383 | if (*objp == before_this) | |
384 | { | |
385 | objfile->next = *objp; | |
386 | *objp = objfile; | |
387 | return; | |
388 | } | |
389 | } | |
390 | ||
391 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 392 | _("put_objfile_before: before objfile not in list")); |
5b5d99cf JB |
393 | } |
394 | ||
c906108c SS |
395 | /* Put OBJFILE at the front of the list. */ |
396 | ||
397 | void | |
fba45db2 | 398 | objfile_to_front (struct objfile *objfile) |
c906108c SS |
399 | { |
400 | struct objfile **objp; | |
401 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
402 | { | |
403 | if (*objp == objfile) | |
404 | { | |
405 | /* Unhook it from where it is. */ | |
406 | *objp = objfile->next; | |
407 | /* Put it in the front. */ | |
408 | objfile->next = object_files; | |
409 | object_files = objfile; | |
410 | break; | |
411 | } | |
412 | } | |
413 | } | |
414 | ||
415 | /* Unlink OBJFILE from the list of known objfiles, if it is found in the | |
416 | list. | |
417 | ||
418 | It is not a bug, or error, to call this function if OBJFILE is not known | |
419 | to be in the current list. This is done in the case of mapped objfiles, | |
420 | for example, just to ensure that the mapped objfile doesn't appear twice | |
421 | in the list. Since the list is threaded, linking in a mapped objfile | |
422 | twice would create a circular list. | |
423 | ||
424 | If OBJFILE turns out to be in the list, we zap it's NEXT pointer after | |
425 | unlinking it, just to ensure that we have completely severed any linkages | |
0df8b418 | 426 | between the OBJFILE and the list. */ |
c906108c SS |
427 | |
428 | void | |
fba45db2 | 429 | unlink_objfile (struct objfile *objfile) |
c906108c | 430 | { |
c5aa993b | 431 | struct objfile **objpp; |
c906108c | 432 | |
c5aa993b | 433 | for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next)) |
c906108c | 434 | { |
c5aa993b | 435 | if (*objpp == objfile) |
c906108c | 436 | { |
c5aa993b JM |
437 | *objpp = (*objpp)->next; |
438 | objfile->next = NULL; | |
07cd4b97 | 439 | return; |
c906108c SS |
440 | } |
441 | } | |
07cd4b97 | 442 | |
8e65ff28 | 443 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 444 | _("unlink_objfile: objfile already unlinked")); |
c906108c SS |
445 | } |
446 | ||
15d123c9 TG |
447 | /* Add OBJFILE as a separate debug objfile of PARENT. */ |
448 | ||
449 | void | |
450 | add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent) | |
451 | { | |
452 | gdb_assert (objfile && parent); | |
453 | ||
454 | /* Must not be already in a list. */ | |
455 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
456 | gdb_assert (objfile->separate_debug_objfile_link == NULL); | |
457 | ||
458 | objfile->separate_debug_objfile_backlink = parent; | |
459 | objfile->separate_debug_objfile_link = parent->separate_debug_objfile; | |
460 | parent->separate_debug_objfile = objfile; | |
461 | ||
462 | /* Put the separate debug object before the normal one, this is so that | |
0df8b418 | 463 | usage of the ALL_OBJFILES_SAFE macro will stay safe. */ |
15d123c9 TG |
464 | put_objfile_before (objfile, parent); |
465 | } | |
466 | ||
467 | /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE | |
468 | itself. */ | |
469 | ||
470 | void | |
471 | free_objfile_separate_debug (struct objfile *objfile) | |
472 | { | |
473 | struct objfile *child; | |
474 | ||
475 | for (child = objfile->separate_debug_objfile; child;) | |
476 | { | |
477 | struct objfile *next_child = child->separate_debug_objfile_link; | |
478 | free_objfile (child); | |
479 | child = next_child; | |
480 | } | |
481 | } | |
c906108c SS |
482 | |
483 | /* Destroy an objfile and all the symtabs and psymtabs under it. Note | |
4a146b47 EZ |
484 | that as much as possible is allocated on the objfile_obstack |
485 | so that the memory can be efficiently freed. | |
c906108c SS |
486 | |
487 | Things which we do NOT free because they are not in malloc'd memory | |
488 | or not in memory specific to the objfile include: | |
489 | ||
c5aa993b | 490 | objfile -> sf |
c906108c SS |
491 | |
492 | FIXME: If the objfile is using reusable symbol information (via mmalloc), | |
493 | then we need to take into account the fact that more than one process | |
494 | may be using the symbol information at the same time (when mmalloc is | |
495 | extended to support cooperative locking). When more than one process | |
496 | is using the mapped symbol info, we need to be more careful about when | |
0df8b418 | 497 | we free objects in the reusable area. */ |
c906108c SS |
498 | |
499 | void | |
fba45db2 | 500 | free_objfile (struct objfile *objfile) |
c906108c | 501 | { |
15d123c9 TG |
502 | /* Free all separate debug objfiles. */ |
503 | free_objfile_separate_debug (objfile); | |
504 | ||
5b5d99cf JB |
505 | if (objfile->separate_debug_objfile_backlink) |
506 | { | |
507 | /* We freed the separate debug file, make sure the base objfile | |
508 | doesn't reference it. */ | |
15d123c9 TG |
509 | struct objfile *child; |
510 | ||
511 | child = objfile->separate_debug_objfile_backlink->separate_debug_objfile; | |
512 | ||
513 | if (child == objfile) | |
514 | { | |
515 | /* OBJFILE is the first child. */ | |
516 | objfile->separate_debug_objfile_backlink->separate_debug_objfile = | |
517 | objfile->separate_debug_objfile_link; | |
518 | } | |
519 | else | |
520 | { | |
521 | /* Find OBJFILE in the list. */ | |
522 | while (1) | |
523 | { | |
524 | if (child->separate_debug_objfile_link == objfile) | |
525 | { | |
526 | child->separate_debug_objfile_link = | |
527 | objfile->separate_debug_objfile_link; | |
528 | break; | |
529 | } | |
530 | child = child->separate_debug_objfile_link; | |
531 | gdb_assert (child); | |
532 | } | |
533 | } | |
5b5d99cf JB |
534 | } |
535 | ||
ae5a43e0 DJ |
536 | /* Remove any references to this objfile in the global value |
537 | lists. */ | |
538 | preserve_values (objfile); | |
539 | ||
9f743ef6 JK |
540 | /* It still may reference data modules have associated with the objfile and |
541 | the symbol file data. */ | |
542 | forget_cached_source_info_for_objfile (objfile); | |
543 | ||
c906108c SS |
544 | /* First do any symbol file specific actions required when we are |
545 | finished with a particular symbol file. Note that if the objfile | |
546 | is using reusable symbol information (via mmalloc) then each of | |
547 | these routines is responsible for doing the correct thing, either | |
548 | freeing things which are valid only during this particular gdb | |
0df8b418 | 549 | execution, or leaving them to be reused during the next one. */ |
c906108c | 550 | |
c5aa993b | 551 | if (objfile->sf != NULL) |
c906108c | 552 | { |
c5aa993b | 553 | (*objfile->sf->sym_finish) (objfile); |
c906108c SS |
554 | } |
555 | ||
9f743ef6 JK |
556 | /* Discard any data modules have associated with the objfile. The function |
557 | still may reference objfile->obfd. */ | |
c5bc3a77 DJ |
558 | objfile_free_data (objfile); |
559 | ||
e3c69974 | 560 | gdb_bfd_unref (objfile->obfd); |
c906108c | 561 | |
0df8b418 | 562 | /* Remove it from the chain of all objfiles. */ |
c906108c SS |
563 | |
564 | unlink_objfile (objfile); | |
565 | ||
adb7f338 JK |
566 | if (objfile == symfile_objfile) |
567 | symfile_objfile = NULL; | |
c906108c SS |
568 | |
569 | if (objfile == rt_common_objfile) | |
570 | rt_common_objfile = NULL; | |
571 | ||
572 | /* Before the symbol table code was redone to make it easier to | |
573 | selectively load and remove information particular to a specific | |
574 | linkage unit, gdb used to do these things whenever the monolithic | |
575 | symbol table was blown away. How much still needs to be done | |
576 | is unknown, but we play it safe for now and keep each action until | |
0df8b418 | 577 | it is shown to be no longer needed. */ |
c5aa993b | 578 | |
cb5d864f FF |
579 | /* Not all our callers call clear_symtab_users (objfile_purge_solibs, |
580 | for example), so we need to call this here. */ | |
c906108c SS |
581 | clear_pc_function_cache (); |
582 | ||
9bdcbae7 DJ |
583 | /* Clear globals which might have pointed into a removed objfile. |
584 | FIXME: It's not clear which of these are supposed to persist | |
585 | between expressions and which ought to be reset each time. */ | |
586 | expression_context_block = NULL; | |
587 | innermost_block = NULL; | |
588 | ||
cb5d864f | 589 | /* Check to see if the current_source_symtab belongs to this objfile, |
0df8b418 | 590 | and if so, call clear_current_source_symtab_and_line. */ |
cb5d864f FF |
591 | |
592 | { | |
593 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
cb5d864f | 594 | |
00174a86 TT |
595 | if (cursal.symtab && cursal.symtab->objfile == objfile) |
596 | clear_current_source_symtab_and_line (); | |
cb5d864f FF |
597 | } |
598 | ||
0df8b418 | 599 | /* The last thing we do is free the objfile struct itself. */ |
c906108c | 600 | |
d31d2fc3 | 601 | xfree (objfile->name); |
78a4a9b9 | 602 | if (objfile->global_psymbols.list) |
2dc74dc1 | 603 | xfree (objfile->global_psymbols.list); |
78a4a9b9 | 604 | if (objfile->static_psymbols.list) |
2dc74dc1 | 605 | xfree (objfile->static_psymbols.list); |
0df8b418 | 606 | /* Free the obstacks for non-reusable objfiles. */ |
710e1a31 | 607 | psymbol_bcache_free (objfile->psymbol_cache); |
78a4a9b9 | 608 | bcache_xfree (objfile->macro_cache); |
10abe6bf | 609 | bcache_xfree (objfile->filename_cache); |
78a4a9b9 AC |
610 | if (objfile->demangled_names_hash) |
611 | htab_delete (objfile->demangled_names_hash); | |
b99607ea | 612 | obstack_free (&objfile->objfile_obstack, 0); |
6c95b8df PA |
613 | |
614 | /* Rebuild section map next time we need it. */ | |
615 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; | |
616 | ||
2dc74dc1 | 617 | xfree (objfile); |
c906108c SS |
618 | } |
619 | ||
74b7792f AC |
620 | static void |
621 | do_free_objfile_cleanup (void *obj) | |
622 | { | |
623 | free_objfile (obj); | |
624 | } | |
625 | ||
626 | struct cleanup * | |
627 | make_cleanup_free_objfile (struct objfile *obj) | |
628 | { | |
629 | return make_cleanup (do_free_objfile_cleanup, obj); | |
630 | } | |
c906108c SS |
631 | |
632 | /* Free all the object files at once and clean up their users. */ | |
633 | ||
634 | void | |
fba45db2 | 635 | free_all_objfiles (void) |
c906108c SS |
636 | { |
637 | struct objfile *objfile, *temp; | |
0133421a JK |
638 | struct so_list *so; |
639 | ||
640 | /* Any objfile referencewould become stale. */ | |
641 | for (so = master_so_list (); so; so = so->next) | |
642 | gdb_assert (so->objfile == NULL); | |
c906108c SS |
643 | |
644 | ALL_OBJFILES_SAFE (objfile, temp) | |
c5aa993b JM |
645 | { |
646 | free_objfile (objfile); | |
647 | } | |
c1e56572 | 648 | clear_symtab_users (0); |
c906108c SS |
649 | } |
650 | \f | |
34eaf542 TT |
651 | /* A helper function for objfile_relocate1 that relocates a single |
652 | symbol. */ | |
653 | ||
654 | static void | |
655 | relocate_one_symbol (struct symbol *sym, struct objfile *objfile, | |
656 | struct section_offsets *delta) | |
657 | { | |
658 | fixup_symbol_section (sym, objfile); | |
659 | ||
660 | /* The RS6000 code from which this was taken skipped | |
661 | any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN. | |
662 | But I'm leaving out that test, on the theory that | |
663 | they can't possibly pass the tests below. */ | |
664 | if ((SYMBOL_CLASS (sym) == LOC_LABEL | |
665 | || SYMBOL_CLASS (sym) == LOC_STATIC) | |
666 | && SYMBOL_SECTION (sym) >= 0) | |
667 | { | |
668 | SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym)); | |
669 | } | |
670 | } | |
671 | ||
c906108c | 672 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS |
b260e109 JK |
673 | entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here. |
674 | Return non-zero iff any change happened. */ | |
567995e1 | 675 | |
b260e109 | 676 | static int |
5cc80db3 MS |
677 | objfile_relocate1 (struct objfile *objfile, |
678 | struct section_offsets *new_offsets) | |
c906108c | 679 | { |
30510692 | 680 | struct obj_section *s; |
d4f3574e | 681 | struct section_offsets *delta = |
a39a16c4 MM |
682 | ((struct section_offsets *) |
683 | alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections))); | |
c906108c | 684 | |
5cc80db3 MS |
685 | int i; |
686 | int something_changed = 0; | |
687 | ||
688 | for (i = 0; i < objfile->num_sections; ++i) | |
689 | { | |
690 | delta->offsets[i] = | |
691 | ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i); | |
692 | if (ANOFFSET (delta, i) != 0) | |
693 | something_changed = 1; | |
694 | } | |
695 | if (!something_changed) | |
696 | return 0; | |
c906108c SS |
697 | |
698 | /* OK, get all the symtabs. */ | |
699 | { | |
700 | struct symtab *s; | |
701 | ||
702 | ALL_OBJFILE_SYMTABS (objfile, s) | |
c5aa993b JM |
703 | { |
704 | struct linetable *l; | |
705 | struct blockvector *bv; | |
706 | int i; | |
707 | ||
708 | /* First the line table. */ | |
709 | l = LINETABLE (s); | |
710 | if (l) | |
711 | { | |
712 | for (i = 0; i < l->nitems; ++i) | |
713 | l->item[i].pc += ANOFFSET (delta, s->block_line_section); | |
714 | } | |
c906108c | 715 | |
c5aa993b JM |
716 | /* Don't relocate a shared blockvector more than once. */ |
717 | if (!s->primary) | |
718 | continue; | |
c906108c | 719 | |
c5aa993b | 720 | bv = BLOCKVECTOR (s); |
b101f7a1 UW |
721 | if (BLOCKVECTOR_MAP (bv)) |
722 | addrmap_relocate (BLOCKVECTOR_MAP (bv), | |
723 | ANOFFSET (delta, s->block_line_section)); | |
724 | ||
c5aa993b JM |
725 | for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i) |
726 | { | |
727 | struct block *b; | |
e88c90f2 | 728 | struct symbol *sym; |
de4f826b | 729 | struct dict_iterator iter; |
c5aa993b JM |
730 | |
731 | b = BLOCKVECTOR_BLOCK (bv, i); | |
732 | BLOCK_START (b) += ANOFFSET (delta, s->block_line_section); | |
733 | BLOCK_END (b) += ANOFFSET (delta, s->block_line_section); | |
734 | ||
8157b174 TT |
735 | /* We only want to iterate over the local symbols, not any |
736 | symbols in included symtabs. */ | |
737 | ALL_DICT_SYMBOLS (BLOCK_DICT (b), iter, sym) | |
c5aa993b | 738 | { |
34eaf542 | 739 | relocate_one_symbol (sym, objfile, delta); |
c5aa993b JM |
740 | } |
741 | } | |
742 | } | |
c906108c SS |
743 | } |
744 | ||
34eaf542 TT |
745 | /* Relocate isolated symbols. */ |
746 | { | |
747 | struct symbol *iter; | |
748 | ||
749 | for (iter = objfile->template_symbols; iter; iter = iter->hash_next) | |
750 | relocate_one_symbol (iter, objfile, delta); | |
751 | } | |
752 | ||
9b14d7aa JK |
753 | if (objfile->psymtabs_addrmap) |
754 | addrmap_relocate (objfile->psymtabs_addrmap, | |
755 | ANOFFSET (delta, SECT_OFF_TEXT (objfile))); | |
756 | ||
ccefe4c4 TT |
757 | if (objfile->sf) |
758 | objfile->sf->qf->relocate (objfile, new_offsets, delta); | |
c906108c SS |
759 | |
760 | { | |
761 | struct minimal_symbol *msym; | |
5cc80db3 | 762 | |
c906108c SS |
763 | ALL_OBJFILE_MSYMBOLS (objfile, msym) |
764 | if (SYMBOL_SECTION (msym) >= 0) | |
c5aa993b | 765 | SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym)); |
c906108c SS |
766 | } |
767 | /* Relocating different sections by different amounts may cause the symbols | |
768 | to be out of order. */ | |
769 | msymbols_sort (objfile); | |
770 | ||
abd0a5fa | 771 | if (objfile->ei.entry_point_p) |
36b0c0e0 PS |
772 | { |
773 | /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT | |
774 | only as a fallback. */ | |
775 | struct obj_section *s; | |
776 | s = find_pc_section (objfile->ei.entry_point); | |
777 | if (s) | |
778 | objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index); | |
779 | else | |
780 | objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); | |
781 | } | |
782 | ||
f1f2b5f4 PA |
783 | { |
784 | int i; | |
5cc80db3 | 785 | |
f1f2b5f4 PA |
786 | for (i = 0; i < objfile->num_sections; ++i) |
787 | (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i); | |
788 | } | |
789 | ||
790 | /* Rebuild section map next time we need it. */ | |
6c95b8df | 791 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; |
f1f2b5f4 | 792 | |
30510692 DJ |
793 | /* Update the table in exec_ops, used to read memory. */ |
794 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
795 | { | |
796 | int idx = s->the_bfd_section->index; | |
797 | ||
798 | exec_set_section_address (bfd_get_filename (objfile->obfd), idx, | |
f1f6aadf | 799 | obj_section_addr (s)); |
30510692 | 800 | } |
b260e109 | 801 | |
55aa24fb SDJ |
802 | /* Relocating probes. */ |
803 | if (objfile->sf && objfile->sf->sym_probe_fns) | |
804 | objfile->sf->sym_probe_fns->sym_relocate_probe (objfile, | |
805 | new_offsets, delta); | |
806 | ||
b260e109 JK |
807 | /* Data changed. */ |
808 | return 1; | |
567995e1 JK |
809 | } |
810 | ||
811 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS | |
812 | entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs. | |
813 | ||
814 | The number and ordering of sections does differ between the two objfiles. | |
815 | Only their names match. Also the file offsets will differ (objfile being | |
816 | possibly prelinked but separate_debug_objfile is probably not prelinked) but | |
817 | the in-memory absolute address as specified by NEW_OFFSETS must match both | |
818 | files. */ | |
819 | ||
820 | void | |
821 | objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets) | |
822 | { | |
823 | struct objfile *debug_objfile; | |
b260e109 | 824 | int changed = 0; |
567995e1 | 825 | |
b260e109 | 826 | changed |= objfile_relocate1 (objfile, new_offsets); |
567995e1 JK |
827 | |
828 | for (debug_objfile = objfile->separate_debug_objfile; | |
829 | debug_objfile; | |
830 | debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile)) | |
831 | { | |
832 | struct section_addr_info *objfile_addrs; | |
833 | struct section_offsets *new_debug_offsets; | |
567995e1 JK |
834 | struct cleanup *my_cleanups; |
835 | ||
836 | objfile_addrs = build_section_addr_info_from_objfile (objfile); | |
837 | my_cleanups = make_cleanup (xfree, objfile_addrs); | |
838 | ||
839 | /* Here OBJFILE_ADDRS contain the correct absolute addresses, the | |
840 | relative ones must be already created according to debug_objfile. */ | |
841 | ||
842 | addr_info_make_relative (objfile_addrs, debug_objfile->obfd); | |
843 | ||
844 | gdb_assert (debug_objfile->num_sections | |
845 | == bfd_count_sections (debug_objfile->obfd)); | |
4fc06681 MS |
846 | new_debug_offsets = |
847 | xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections)); | |
567995e1 JK |
848 | make_cleanup (xfree, new_debug_offsets); |
849 | relative_addr_info_to_section_offsets (new_debug_offsets, | |
850 | debug_objfile->num_sections, | |
851 | objfile_addrs); | |
852 | ||
b260e109 | 853 | changed |= objfile_relocate1 (debug_objfile, new_debug_offsets); |
567995e1 JK |
854 | |
855 | do_cleanups (my_cleanups); | |
856 | } | |
30510692 | 857 | |
0df8b418 | 858 | /* Relocate breakpoints as necessary, after things are relocated. */ |
b260e109 JK |
859 | if (changed) |
860 | breakpoint_re_set (); | |
c906108c SS |
861 | } |
862 | \f | |
55333a84 DE |
863 | /* Return non-zero if OBJFILE has partial symbols. */ |
864 | ||
865 | int | |
866 | objfile_has_partial_symbols (struct objfile *objfile) | |
867 | { | |
b11896a5 TT |
868 | if (!objfile->sf) |
869 | return 0; | |
3e03848b JK |
870 | |
871 | /* If we have not read psymbols, but we have a function capable of reading | |
872 | them, then that is an indication that they are in fact available. Without | |
873 | this function the symbols may have been already read in but they also may | |
874 | not be present in this objfile. */ | |
875 | if ((objfile->flags & OBJF_PSYMTABS_READ) == 0 | |
876 | && objfile->sf->sym_read_psymbols != NULL) | |
877 | return 1; | |
878 | ||
b11896a5 | 879 | return objfile->sf->qf->has_symbols (objfile); |
55333a84 DE |
880 | } |
881 | ||
882 | /* Return non-zero if OBJFILE has full symbols. */ | |
883 | ||
884 | int | |
885 | objfile_has_full_symbols (struct objfile *objfile) | |
886 | { | |
887 | return objfile->symtabs != NULL; | |
888 | } | |
889 | ||
e361b228 | 890 | /* Return non-zero if OBJFILE has full or partial symbols, either directly |
15d123c9 | 891 | or through a separate debug file. */ |
e361b228 TG |
892 | |
893 | int | |
894 | objfile_has_symbols (struct objfile *objfile) | |
895 | { | |
15d123c9 | 896 | struct objfile *o; |
e361b228 | 897 | |
15d123c9 TG |
898 | for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o)) |
899 | if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o)) | |
900 | return 1; | |
e361b228 TG |
901 | return 0; |
902 | } | |
903 | ||
904 | ||
c906108c SS |
905 | /* Many places in gdb want to test just to see if we have any partial |
906 | symbols available. This function returns zero if none are currently | |
0df8b418 | 907 | available, nonzero otherwise. */ |
c906108c SS |
908 | |
909 | int | |
fba45db2 | 910 | have_partial_symbols (void) |
c906108c SS |
911 | { |
912 | struct objfile *ofp; | |
913 | ||
914 | ALL_OBJFILES (ofp) | |
c5aa993b | 915 | { |
55333a84 DE |
916 | if (objfile_has_partial_symbols (ofp)) |
917 | return 1; | |
c5aa993b | 918 | } |
c906108c SS |
919 | return 0; |
920 | } | |
921 | ||
922 | /* Many places in gdb want to test just to see if we have any full | |
923 | symbols available. This function returns zero if none are currently | |
0df8b418 | 924 | available, nonzero otherwise. */ |
c906108c SS |
925 | |
926 | int | |
fba45db2 | 927 | have_full_symbols (void) |
c906108c SS |
928 | { |
929 | struct objfile *ofp; | |
930 | ||
931 | ALL_OBJFILES (ofp) | |
c5aa993b | 932 | { |
55333a84 DE |
933 | if (objfile_has_full_symbols (ofp)) |
934 | return 1; | |
c5aa993b | 935 | } |
c906108c SS |
936 | return 0; |
937 | } | |
938 | ||
939 | ||
940 | /* This operations deletes all objfile entries that represent solibs that | |
941 | weren't explicitly loaded by the user, via e.g., the add-symbol-file | |
0df8b418 MS |
942 | command. */ |
943 | ||
c906108c | 944 | void |
fba45db2 | 945 | objfile_purge_solibs (void) |
c906108c | 946 | { |
c5aa993b JM |
947 | struct objfile *objf; |
948 | struct objfile *temp; | |
c906108c SS |
949 | |
950 | ALL_OBJFILES_SAFE (objf, temp) | |
951 | { | |
952 | /* We assume that the solib package has been purged already, or will | |
0df8b418 MS |
953 | be soon. */ |
954 | ||
2df3850c | 955 | if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED)) |
c906108c SS |
956 | free_objfile (objf); |
957 | } | |
958 | } | |
959 | ||
960 | ||
961 | /* Many places in gdb want to test just to see if we have any minimal | |
962 | symbols available. This function returns zero if none are currently | |
0df8b418 | 963 | available, nonzero otherwise. */ |
c906108c SS |
964 | |
965 | int | |
fba45db2 | 966 | have_minimal_symbols (void) |
c906108c SS |
967 | { |
968 | struct objfile *ofp; | |
969 | ||
970 | ALL_OBJFILES (ofp) | |
c5aa993b | 971 | { |
15831452 | 972 | if (ofp->minimal_symbol_count > 0) |
c5aa993b JM |
973 | { |
974 | return 1; | |
975 | } | |
976 | } | |
c906108c SS |
977 | return 0; |
978 | } | |
979 | ||
a845f5cb PP |
980 | /* Qsort comparison function. */ |
981 | ||
982 | static int | |
983 | qsort_cmp (const void *a, const void *b) | |
984 | { | |
985 | const struct obj_section *sect1 = *(const struct obj_section **) a; | |
986 | const struct obj_section *sect2 = *(const struct obj_section **) b; | |
987 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
988 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
989 | ||
990 | if (sect1_addr < sect2_addr) | |
6fbf07cd | 991 | return -1; |
a845f5cb | 992 | else if (sect1_addr > sect2_addr) |
6fbf07cd PP |
993 | return 1; |
994 | else | |
5cc80db3 MS |
995 | { |
996 | /* Sections are at the same address. This could happen if | |
997 | A) we have an objfile and a separate debuginfo. | |
998 | B) we are confused, and have added sections without proper relocation, | |
0df8b418 | 999 | or something like that. */ |
5cc80db3 MS |
1000 | |
1001 | const struct objfile *const objfile1 = sect1->objfile; | |
1002 | const struct objfile *const objfile2 = sect2->objfile; | |
1003 | ||
1004 | if (objfile1->separate_debug_objfile == objfile2 | |
1005 | || objfile2->separate_debug_objfile == objfile1) | |
1006 | { | |
1007 | /* Case A. The ordering doesn't matter: separate debuginfo files | |
1008 | will be filtered out later. */ | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | /* Case B. Maintain stable sort order, so bugs in GDB are easier to | |
1014 | triage. This section could be slow (since we iterate over all | |
1015 | objfiles in each call to qsort_cmp), but this shouldn't happen | |
1016 | very often (GDB is already in a confused state; one hopes this | |
1017 | doesn't happen at all). If you discover that significant time is | |
1018 | spent in the loops below, do 'set complaints 100' and examine the | |
1019 | resulting complaints. */ | |
1020 | ||
1021 | if (objfile1 == objfile2) | |
1022 | { | |
1023 | /* Both sections came from the same objfile. We are really confused. | |
1024 | Sort on sequence order of sections within the objfile. */ | |
1025 | ||
1026 | const struct obj_section *osect; | |
1027 | ||
1028 | ALL_OBJFILE_OSECTIONS (objfile1, osect) | |
1029 | if (osect == sect1) | |
1030 | return -1; | |
1031 | else if (osect == sect2) | |
1032 | return 1; | |
1033 | ||
1034 | /* We should have found one of the sections before getting here. */ | |
f3574227 | 1035 | gdb_assert_not_reached ("section not found"); |
5cc80db3 MS |
1036 | } |
1037 | else | |
1038 | { | |
1039 | /* Sort on sequence number of the objfile in the chain. */ | |
1040 | ||
1041 | const struct objfile *objfile; | |
1042 | ||
1043 | ALL_OBJFILES (objfile) | |
1044 | if (objfile == objfile1) | |
1045 | return -1; | |
1046 | else if (objfile == objfile2) | |
1047 | return 1; | |
1048 | ||
1049 | /* We should have found one of the objfiles before getting here. */ | |
f3574227 | 1050 | gdb_assert_not_reached ("objfile not found"); |
5cc80db3 MS |
1051 | } |
1052 | } | |
6fbf07cd PP |
1053 | |
1054 | /* Unreachable. */ | |
f3574227 | 1055 | gdb_assert_not_reached ("unexpected code path"); |
a845f5cb PP |
1056 | return 0; |
1057 | } | |
1058 | ||
3aad21cf PP |
1059 | /* Select "better" obj_section to keep. We prefer the one that came from |
1060 | the real object, rather than the one from separate debuginfo. | |
1061 | Most of the time the two sections are exactly identical, but with | |
1062 | prelinking the .rel.dyn section in the real object may have different | |
1063 | size. */ | |
1064 | ||
1065 | static struct obj_section * | |
1066 | preferred_obj_section (struct obj_section *a, struct obj_section *b) | |
1067 | { | |
1068 | gdb_assert (obj_section_addr (a) == obj_section_addr (b)); | |
1069 | gdb_assert ((a->objfile->separate_debug_objfile == b->objfile) | |
1070 | || (b->objfile->separate_debug_objfile == a->objfile)); | |
1071 | gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile) | |
1072 | || (b->objfile->separate_debug_objfile_backlink == a->objfile)); | |
1073 | ||
1074 | if (a->objfile->separate_debug_objfile != NULL) | |
1075 | return a; | |
1076 | return b; | |
1077 | } | |
1078 | ||
6fbf07cd PP |
1079 | /* Return 1 if SECTION should be inserted into the section map. |
1080 | We want to insert only non-overlay and non-TLS section. */ | |
1081 | ||
1082 | static int | |
1083 | insert_section_p (const struct bfd *abfd, | |
1084 | const struct bfd_section *section) | |
1085 | { | |
1086 | const bfd_vma lma = bfd_section_lma (abfd, section); | |
1087 | ||
50f8ea94 | 1088 | if (overlay_debugging && lma != 0 && lma != bfd_section_vma (abfd, section) |
6fbf07cd PP |
1089 | && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0) |
1090 | /* This is an overlay section. IN_MEMORY check is needed to avoid | |
1091 | discarding sections from the "system supplied DSO" (aka vdso) | |
1092 | on some Linux systems (e.g. Fedora 11). */ | |
1093 | return 0; | |
1094 | if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0) | |
1095 | /* This is a TLS section. */ | |
1096 | return 0; | |
1097 | ||
1098 | return 1; | |
1099 | } | |
1100 | ||
1101 | /* Filter out overlapping sections where one section came from the real | |
1102 | objfile, and the other from a separate debuginfo file. | |
1103 | Return the size of table after redundant sections have been eliminated. */ | |
1104 | ||
1105 | static int | |
1106 | filter_debuginfo_sections (struct obj_section **map, int map_size) | |
1107 | { | |
1108 | int i, j; | |
1109 | ||
1110 | for (i = 0, j = 0; i < map_size - 1; i++) | |
1111 | { | |
1112 | struct obj_section *const sect1 = map[i]; | |
1113 | struct obj_section *const sect2 = map[i + 1]; | |
1114 | const struct objfile *const objfile1 = sect1->objfile; | |
1115 | const struct objfile *const objfile2 = sect2->objfile; | |
1116 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1117 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1118 | ||
1119 | if (sect1_addr == sect2_addr | |
1120 | && (objfile1->separate_debug_objfile == objfile2 | |
1121 | || objfile2->separate_debug_objfile == objfile1)) | |
1122 | { | |
1123 | map[j++] = preferred_obj_section (sect1, sect2); | |
1124 | ++i; | |
1125 | } | |
1126 | else | |
1127 | map[j++] = sect1; | |
1128 | } | |
1129 | ||
1130 | if (i < map_size) | |
1131 | { | |
1132 | gdb_assert (i == map_size - 1); | |
1133 | map[j++] = map[i]; | |
1134 | } | |
1135 | ||
1136 | /* The map should not have shrunk to less than half the original size. */ | |
1137 | gdb_assert (map_size / 2 <= j); | |
1138 | ||
1139 | return j; | |
1140 | } | |
1141 | ||
1142 | /* Filter out overlapping sections, issuing a warning if any are found. | |
1143 | Overlapping sections could really be overlay sections which we didn't | |
1144 | classify as such in insert_section_p, or we could be dealing with a | |
1145 | corrupt binary. */ | |
1146 | ||
1147 | static int | |
1148 | filter_overlapping_sections (struct obj_section **map, int map_size) | |
1149 | { | |
1150 | int i, j; | |
1151 | ||
1152 | for (i = 0, j = 0; i < map_size - 1; ) | |
1153 | { | |
1154 | int k; | |
1155 | ||
1156 | map[j++] = map[i]; | |
1157 | for (k = i + 1; k < map_size; k++) | |
1158 | { | |
1159 | struct obj_section *const sect1 = map[i]; | |
1160 | struct obj_section *const sect2 = map[k]; | |
1161 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1162 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1163 | const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1); | |
1164 | ||
1165 | gdb_assert (sect1_addr <= sect2_addr); | |
1166 | ||
1167 | if (sect1_endaddr <= sect2_addr) | |
1168 | break; | |
1169 | else | |
1170 | { | |
1171 | /* We have an overlap. Report it. */ | |
1172 | ||
1173 | struct objfile *const objf1 = sect1->objfile; | |
1174 | struct objfile *const objf2 = sect2->objfile; | |
1175 | ||
1176 | const struct bfd *const abfd1 = objf1->obfd; | |
1177 | const struct bfd *const abfd2 = objf2->obfd; | |
1178 | ||
1179 | const struct bfd_section *const bfds1 = sect1->the_bfd_section; | |
1180 | const struct bfd_section *const bfds2 = sect2->the_bfd_section; | |
1181 | ||
1182 | const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2); | |
1183 | ||
1184 | struct gdbarch *const gdbarch = get_objfile_arch (objf1); | |
1185 | ||
1186 | complaint (&symfile_complaints, | |
1187 | _("unexpected overlap between:\n" | |
1188 | " (A) section `%s' from `%s' [%s, %s)\n" | |
1189 | " (B) section `%s' from `%s' [%s, %s).\n" | |
1190 | "Will ignore section B"), | |
1191 | bfd_section_name (abfd1, bfds1), objf1->name, | |
1192 | paddress (gdbarch, sect1_addr), | |
1193 | paddress (gdbarch, sect1_endaddr), | |
1194 | bfd_section_name (abfd2, bfds2), objf2->name, | |
1195 | paddress (gdbarch, sect2_addr), | |
1196 | paddress (gdbarch, sect2_endaddr)); | |
1197 | } | |
1198 | } | |
1199 | i = k; | |
1200 | } | |
1201 | ||
1202 | if (i < map_size) | |
1203 | { | |
1204 | gdb_assert (i == map_size - 1); | |
1205 | map[j++] = map[i]; | |
1206 | } | |
1207 | ||
1208 | return j; | |
1209 | } | |
1210 | ||
1211 | ||
1212 | /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any | |
1213 | TLS, overlay and overlapping sections. */ | |
a845f5cb PP |
1214 | |
1215 | static void | |
6c95b8df PA |
1216 | update_section_map (struct program_space *pspace, |
1217 | struct obj_section ***pmap, int *pmap_size) | |
a845f5cb | 1218 | { |
6fbf07cd | 1219 | int alloc_size, map_size, i; |
a845f5cb PP |
1220 | struct obj_section *s, **map; |
1221 | struct objfile *objfile; | |
1222 | ||
6c95b8df | 1223 | gdb_assert (get_objfile_pspace_data (pspace)->objfiles_changed_p != 0); |
a845f5cb PP |
1224 | |
1225 | map = *pmap; | |
1226 | xfree (map); | |
1227 | ||
6fbf07cd | 1228 | alloc_size = 0; |
6c95b8df PA |
1229 | ALL_PSPACE_OBJFILES (pspace, objfile) |
1230 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
1231 | if (insert_section_p (objfile->obfd, s->the_bfd_section)) | |
1232 | alloc_size += 1; | |
a845f5cb | 1233 | |
65a97ab3 PP |
1234 | /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */ |
1235 | if (alloc_size == 0) | |
1236 | { | |
1237 | *pmap = NULL; | |
1238 | *pmap_size = 0; | |
1239 | return; | |
1240 | } | |
1241 | ||
6fbf07cd | 1242 | map = xmalloc (alloc_size * sizeof (*map)); |
a845f5cb | 1243 | |
3aad21cf | 1244 | i = 0; |
6c95b8df PA |
1245 | ALL_PSPACE_OBJFILES (pspace, objfile) |
1246 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
1247 | if (insert_section_p (objfile->obfd, s->the_bfd_section)) | |
1248 | map[i++] = s; | |
a845f5cb | 1249 | |
6fbf07cd PP |
1250 | qsort (map, alloc_size, sizeof (*map), qsort_cmp); |
1251 | map_size = filter_debuginfo_sections(map, alloc_size); | |
1252 | map_size = filter_overlapping_sections(map, map_size); | |
a845f5cb | 1253 | |
6fbf07cd PP |
1254 | if (map_size < alloc_size) |
1255 | /* Some sections were eliminated. Trim excess space. */ | |
1256 | map = xrealloc (map, map_size * sizeof (*map)); | |
3aad21cf | 1257 | else |
6fbf07cd | 1258 | gdb_assert (alloc_size == map_size); |
3aad21cf | 1259 | |
a845f5cb PP |
1260 | *pmap = map; |
1261 | *pmap_size = map_size; | |
1262 | } | |
1263 | ||
0df8b418 | 1264 | /* Bsearch comparison function. */ |
a845f5cb PP |
1265 | |
1266 | static int | |
1267 | bsearch_cmp (const void *key, const void *elt) | |
1268 | { | |
1269 | const CORE_ADDR pc = *(CORE_ADDR *) key; | |
1270 | const struct obj_section *section = *(const struct obj_section **) elt; | |
1271 | ||
1272 | if (pc < obj_section_addr (section)) | |
1273 | return -1; | |
1274 | if (pc < obj_section_endaddr (section)) | |
1275 | return 0; | |
1276 | return 1; | |
1277 | } | |
1278 | ||
714835d5 | 1279 | /* Returns a section whose range includes PC or NULL if none found. */ |
c906108c SS |
1280 | |
1281 | struct obj_section * | |
714835d5 | 1282 | find_pc_section (CORE_ADDR pc) |
c906108c | 1283 | { |
6c95b8df | 1284 | struct objfile_pspace_info *pspace_info; |
a845f5cb | 1285 | struct obj_section *s, **sp; |
c5aa993b | 1286 | |
714835d5 UW |
1287 | /* Check for mapped overlay section first. */ |
1288 | s = find_pc_mapped_section (pc); | |
1289 | if (s) | |
1290 | return s; | |
c906108c | 1291 | |
6c95b8df PA |
1292 | pspace_info = get_objfile_pspace_data (current_program_space); |
1293 | if (pspace_info->objfiles_changed_p != 0) | |
a845f5cb | 1294 | { |
6c95b8df PA |
1295 | update_section_map (current_program_space, |
1296 | &pspace_info->sections, | |
1297 | &pspace_info->num_sections); | |
c906108c | 1298 | |
6c95b8df PA |
1299 | /* Don't need updates to section map until objfiles are added, |
1300 | removed or relocated. */ | |
1301 | pspace_info->objfiles_changed_p = 0; | |
a845f5cb PP |
1302 | } |
1303 | ||
65a97ab3 PP |
1304 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1305 | bsearch be non-NULL. */ | |
1306 | if (pspace_info->sections == NULL) | |
1307 | { | |
1308 | gdb_assert (pspace_info->num_sections == 0); | |
1309 | return NULL; | |
1310 | } | |
1311 | ||
6c95b8df PA |
1312 | sp = (struct obj_section **) bsearch (&pc, |
1313 | pspace_info->sections, | |
1314 | pspace_info->num_sections, | |
1315 | sizeof (*pspace_info->sections), | |
1316 | bsearch_cmp); | |
a845f5cb PP |
1317 | if (sp != NULL) |
1318 | return *sp; | |
714835d5 | 1319 | return NULL; |
c906108c | 1320 | } |
c5aa993b | 1321 | |
c906108c SS |
1322 | |
1323 | /* In SVR4, we recognize a trampoline by it's section name. | |
1324 | That is, if the pc is in a section named ".plt" then we are in | |
1325 | a trampoline. */ | |
1326 | ||
1327 | int | |
fba45db2 | 1328 | in_plt_section (CORE_ADDR pc, char *name) |
c906108c SS |
1329 | { |
1330 | struct obj_section *s; | |
1331 | int retval = 0; | |
c5aa993b JM |
1332 | |
1333 | s = find_pc_section (pc); | |
1334 | ||
c906108c SS |
1335 | retval = (s != NULL |
1336 | && s->the_bfd_section->name != NULL | |
6314a349 | 1337 | && strcmp (s->the_bfd_section->name, ".plt") == 0); |
c5aa993b | 1338 | return (retval); |
c906108c | 1339 | } |
0d0e1a63 MK |
1340 | \f |
1341 | ||
bb272892 PP |
1342 | /* Set objfiles_changed_p so section map will be rebuilt next time it |
1343 | is used. Called by reread_symbols. */ | |
a845f5cb PP |
1344 | |
1345 | void | |
bb272892 | 1346 | objfiles_changed (void) |
a845f5cb | 1347 | { |
6c95b8df PA |
1348 | /* Rebuild section map next time we need it. */ |
1349 | get_objfile_pspace_data (current_program_space)->objfiles_changed_p = 1; | |
a845f5cb | 1350 | } |
e3c69974 | 1351 | |
19630284 JB |
1352 | /* The default implementation for the "iterate_over_objfiles_in_search_order" |
1353 | gdbarch method. It is equivalent to use the ALL_OBJFILES macro, | |
1354 | searching the objfiles in the order they are stored internally, | |
1355 | ignoring CURRENT_OBJFILE. | |
1356 | ||
1357 | On most platorms, it should be close enough to doing the best | |
1358 | we can without some knowledge specific to the architecture. */ | |
1359 | ||
1360 | void | |
1361 | default_iterate_over_objfiles_in_search_order | |
1362 | (struct gdbarch *gdbarch, | |
1363 | iterate_over_objfiles_in_search_order_cb_ftype *cb, | |
1364 | void *cb_data, struct objfile *current_objfile) | |
1365 | { | |
1366 | int stop = 0; | |
1367 | struct objfile *objfile; | |
1368 | ||
1369 | ALL_OBJFILES (objfile) | |
1370 | { | |
1371 | stop = cb (objfile, cb_data); | |
1372 | if (stop) | |
1373 | return; | |
1374 | } | |
1375 | } | |
1376 | ||
6c95b8df PA |
1377 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1378 | extern initialize_file_ftype _initialize_objfiles; | |
1379 | ||
1380 | void | |
1381 | _initialize_objfiles (void) | |
1382 | { | |
1383 | objfiles_pspace_data | |
8e260fc0 TT |
1384 | = register_program_space_data_with_cleanup (NULL, |
1385 | objfiles_pspace_data_cleanup); | |
6c95b8df | 1386 | } |