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" |
7a292a7a | 56 | |
c906108c SS |
57 | /* Prototypes for local functions */ |
58 | ||
0d0e1a63 MK |
59 | static void objfile_alloc_data (struct objfile *objfile); |
60 | static void objfile_free_data (struct objfile *objfile); | |
61 | ||
c906108c | 62 | /* Externally visible variables that are owned by this module. |
0df8b418 | 63 | See declarations in objfile.h for more info. */ |
c906108c | 64 | |
c906108c SS |
65 | struct objfile *rt_common_objfile; /* For runtime common symbols */ |
66 | ||
6c95b8df PA |
67 | struct objfile_pspace_info |
68 | { | |
69 | int objfiles_changed_p; | |
70 | struct obj_section **sections; | |
71 | int num_sections; | |
72 | }; | |
73 | ||
74 | /* Per-program-space data key. */ | |
75 | static const struct program_space_data *objfiles_pspace_data; | |
76 | ||
77 | static void | |
78 | objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
79 | { | |
80 | struct objfile_pspace_info *info; | |
81 | ||
82 | info = program_space_data (pspace, objfiles_pspace_data); | |
83 | if (info != NULL) | |
84 | { | |
85 | xfree (info->sections); | |
86 | xfree (info); | |
87 | } | |
88 | } | |
89 | ||
90 | /* Get the current svr4 data. If none is found yet, add it now. This | |
91 | function always returns a valid object. */ | |
92 | ||
93 | static struct objfile_pspace_info * | |
94 | get_objfile_pspace_data (struct program_space *pspace) | |
95 | { | |
96 | struct objfile_pspace_info *info; | |
97 | ||
98 | info = program_space_data (pspace, objfiles_pspace_data); | |
99 | if (info == NULL) | |
100 | { | |
101 | info = XZALLOC (struct objfile_pspace_info); | |
102 | set_program_space_data (pspace, objfiles_pspace_data, info); | |
103 | } | |
104 | ||
105 | return info; | |
106 | } | |
107 | ||
a845f5cb PP |
108 | /* Records whether any objfiles appeared or disappeared since we last updated |
109 | address to obj section map. */ | |
110 | ||
0df8b418 | 111 | /* Locate all mappable sections of a BFD file. |
c906108c SS |
112 | objfile_p_char is a char * to get it through |
113 | bfd_map_over_sections; we cast it back to its proper type. */ | |
114 | ||
96baa820 JM |
115 | /* Called via bfd_map_over_sections to build up the section table that |
116 | the objfile references. The objfile contains pointers to the start | |
117 | of the table (objfile->sections) and to the first location after | |
0df8b418 | 118 | the end of the table (objfile->sections_end). */ |
96baa820 | 119 | |
c906108c | 120 | static void |
7be0c536 AC |
121 | add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect, |
122 | void *objfile_p_char) | |
c906108c SS |
123 | { |
124 | struct objfile *objfile = (struct objfile *) objfile_p_char; | |
125 | struct obj_section section; | |
126 | flagword aflag; | |
127 | ||
128 | aflag = bfd_get_section_flags (abfd, asect); | |
129 | ||
ed7c5e43 | 130 | if (!(aflag & SEC_ALLOC)) |
c906108c SS |
131 | return; |
132 | ||
133 | if (0 == bfd_section_size (abfd, asect)) | |
134 | return; | |
c906108c SS |
135 | section.objfile = objfile; |
136 | section.the_bfd_section = asect; | |
137 | section.ovly_mapped = 0; | |
3e43a32a MS |
138 | obstack_grow (&objfile->objfile_obstack, |
139 | (char *) §ion, sizeof (section)); | |
f1f6aadf PA |
140 | objfile->sections_end |
141 | = (struct obj_section *) (((size_t) objfile->sections_end) + 1); | |
c906108c SS |
142 | } |
143 | ||
144 | /* Builds a section table for OBJFILE. | |
145 | Returns 0 if OK, 1 on error (in which case bfd_error contains the | |
96baa820 JM |
146 | error). |
147 | ||
148 | Note that while we are building the table, which goes into the | |
149 | psymbol obstack, we hijack the sections_end pointer to instead hold | |
150 | a count of the number of sections. When bfd_map_over_sections | |
151 | returns, this count is used to compute the pointer to the end of | |
152 | the sections table, which then overwrites the count. | |
153 | ||
154 | Also note that the OFFSET and OVLY_MAPPED in each table entry | |
155 | are initialized to zero. | |
156 | ||
157 | Also note that if anything else writes to the psymbol obstack while | |
0df8b418 | 158 | we are building the table, we're pretty much hosed. */ |
c906108c SS |
159 | |
160 | int | |
fba45db2 | 161 | build_objfile_section_table (struct objfile *objfile) |
c906108c | 162 | { |
c906108c | 163 | objfile->sections_end = 0; |
f1f6aadf PA |
164 | bfd_map_over_sections (objfile->obfd, |
165 | add_to_objfile_sections, (void *) objfile); | |
166 | objfile->sections = obstack_finish (&objfile->objfile_obstack); | |
167 | objfile->sections_end = objfile->sections + (size_t) objfile->sections_end; | |
c5aa993b | 168 | return (0); |
c906108c SS |
169 | } |
170 | ||
2df3850c JM |
171 | /* Given a pointer to an initialized bfd (ABFD) and some flag bits |
172 | allocate a new objfile struct, fill it in as best we can, link it | |
173 | into the list of all known objfiles, and return a pointer to the | |
174 | new objfile struct. | |
c906108c | 175 | |
2df3850c | 176 | The FLAGS word contains various bits (OBJF_*) that can be taken as |
78a4a9b9 | 177 | requests for specific operations. Other bits like OBJF_SHARED are |
0df8b418 | 178 | simply copied through to the new objfile flags member. */ |
c906108c | 179 | |
eb9a305d DC |
180 | /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0 |
181 | by jv-lang.c, to create an artificial objfile used to hold | |
182 | information about dynamically-loaded Java classes. Unfortunately, | |
183 | that branch of this function doesn't get tested very frequently, so | |
184 | it's prone to breakage. (E.g. at one time the name was set to NULL | |
185 | in that situation, which broke a loop over all names in the dynamic | |
186 | library loader.) If you change this function, please try to leave | |
187 | things in a consistent state even if abfd is NULL. */ | |
188 | ||
c906108c | 189 | struct objfile * |
fba45db2 | 190 | allocate_objfile (bfd *abfd, int flags) |
c906108c | 191 | { |
2f6e5d7e | 192 | struct objfile *objfile; |
c906108c | 193 | |
6a0fa043 | 194 | objfile = (struct objfile *) xzalloc (sizeof (struct objfile)); |
710e1a31 | 195 | objfile->psymbol_cache = psymbol_bcache_init (); |
cbd70537 SW |
196 | objfile->macro_cache = bcache_xmalloc (NULL, NULL); |
197 | objfile->filename_cache = bcache_xmalloc (NULL, NULL); | |
2f6e5d7e TG |
198 | /* We could use obstack_specify_allocation here instead, but |
199 | gdb_obstack.h specifies the alloc/dealloc functions. */ | |
200 | obstack_init (&objfile->objfile_obstack); | |
201 | terminate_minimal_symbol_table (objfile); | |
c906108c | 202 | |
0d0e1a63 MK |
203 | objfile_alloc_data (objfile); |
204 | ||
c906108c SS |
205 | /* Update the per-objfile information that comes from the bfd, ensuring |
206 | that any data that is reference is saved in the per-objfile data | |
0df8b418 | 207 | region. */ |
c906108c | 208 | |
3db741ef | 209 | objfile->obfd = gdb_bfd_ref (abfd); |
c906108c SS |
210 | if (abfd != NULL) |
211 | { | |
5e2b427d UW |
212 | /* Look up the gdbarch associated with the BFD. */ |
213 | objfile->gdbarch = gdbarch_from_bfd (abfd); | |
214 | ||
982526a1 | 215 | objfile->name = xstrdup (bfd_get_filename (abfd)); |
c5aa993b | 216 | objfile->mtime = bfd_get_mtime (abfd); |
c906108c SS |
217 | |
218 | /* Build section table. */ | |
219 | ||
220 | if (build_objfile_section_table (objfile)) | |
221 | { | |
8a3fe4f8 | 222 | error (_("Can't find the file sections in `%s': %s"), |
c5aa993b | 223 | objfile->name, bfd_errmsg (bfd_get_error ())); |
c906108c SS |
224 | } |
225 | } | |
eb9a305d DC |
226 | else |
227 | { | |
982526a1 | 228 | objfile->name = xstrdup ("<<anonymous objfile>>"); |
eb9a305d | 229 | } |
c906108c | 230 | |
6c95b8df PA |
231 | objfile->pspace = current_program_space; |
232 | ||
b8fbeb18 | 233 | /* Initialize the section indexes for this objfile, so that we can |
0df8b418 | 234 | later detect if they are used w/o being properly assigned to. */ |
b8fbeb18 | 235 | |
5c4e30ca DC |
236 | objfile->sect_index_text = -1; |
237 | objfile->sect_index_data = -1; | |
238 | objfile->sect_index_bss = -1; | |
239 | objfile->sect_index_rodata = -1; | |
240 | ||
0df8b418 | 241 | /* Add this file onto the tail of the linked list of other such files. */ |
c906108c | 242 | |
c5aa993b | 243 | objfile->next = NULL; |
c906108c SS |
244 | if (object_files == NULL) |
245 | object_files = objfile; | |
246 | else | |
247 | { | |
2f6e5d7e TG |
248 | struct objfile *last_one; |
249 | ||
c906108c | 250 | for (last_one = object_files; |
c5aa993b JM |
251 | last_one->next; |
252 | last_one = last_one->next); | |
253 | last_one->next = objfile; | |
c906108c SS |
254 | } |
255 | ||
0df8b418 | 256 | /* Save passed in flag bits. */ |
2df3850c | 257 | objfile->flags |= flags; |
c906108c | 258 | |
6c95b8df PA |
259 | /* Rebuild section map next time we need it. */ |
260 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; | |
bb272892 | 261 | |
6c95b8df | 262 | return objfile; |
c906108c SS |
263 | } |
264 | ||
5e2b427d UW |
265 | /* Retrieve the gdbarch associated with OBJFILE. */ |
266 | struct gdbarch * | |
267 | get_objfile_arch (struct objfile *objfile) | |
268 | { | |
269 | return objfile->gdbarch; | |
270 | } | |
271 | ||
0df8b418 | 272 | /* Initialize entry point information for this objfile. */ |
9ab9195f EZ |
273 | |
274 | void | |
275 | init_entry_point_info (struct objfile *objfile) | |
276 | { | |
277 | /* Save startup file's range of PC addresses to help blockframe.c | |
278 | decide where the bottom of the stack is. */ | |
279 | ||
280 | if (bfd_get_file_flags (objfile->obfd) & EXEC_P) | |
281 | { | |
282 | /* Executable file -- record its entry point so we'll recognize | |
283 | the startup file because it contains the entry point. */ | |
284 | objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); | |
abd0a5fa | 285 | objfile->ei.entry_point_p = 1; |
9ab9195f | 286 | } |
574dffa2 DJ |
287 | else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC |
288 | && bfd_get_start_address (objfile->obfd) != 0) | |
abd0a5fa JK |
289 | { |
290 | /* Some shared libraries may have entry points set and be | |
291 | runnable. There's no clear way to indicate this, so just check | |
292 | for values other than zero. */ | |
293 | objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); | |
294 | objfile->ei.entry_point_p = 1; | |
295 | } | |
9ab9195f EZ |
296 | else |
297 | { | |
298 | /* Examination of non-executable.o files. Short-circuit this stuff. */ | |
abd0a5fa | 299 | objfile->ei.entry_point_p = 0; |
9ab9195f | 300 | } |
9ab9195f EZ |
301 | } |
302 | ||
abd0a5fa JK |
303 | /* If there is a valid and known entry point, function fills *ENTRY_P with it |
304 | and returns non-zero; otherwise it returns zero. */ | |
9ab9195f | 305 | |
abd0a5fa JK |
306 | int |
307 | entry_point_address_query (CORE_ADDR *entry_p) | |
9ab9195f | 308 | { |
3612b192 DJ |
309 | struct gdbarch *gdbarch; |
310 | CORE_ADDR entry_point; | |
311 | ||
abd0a5fa | 312 | if (symfile_objfile == NULL || !symfile_objfile->ei.entry_point_p) |
3612b192 DJ |
313 | return 0; |
314 | ||
315 | gdbarch = get_objfile_arch (symfile_objfile); | |
316 | ||
317 | entry_point = symfile_objfile->ei.entry_point; | |
318 | ||
319 | /* Make certain that the address points at real code, and not a | |
320 | function descriptor. */ | |
321 | entry_point = gdbarch_convert_from_func_ptr_addr (gdbarch, entry_point, | |
322 | ¤t_target); | |
323 | ||
324 | /* Remove any ISA markers, so that this matches entries in the | |
325 | symbol table. */ | |
326 | entry_point = gdbarch_addr_bits_remove (gdbarch, entry_point); | |
327 | ||
abd0a5fa JK |
328 | *entry_p = entry_point; |
329 | return 1; | |
330 | } | |
331 | ||
332 | /* Get current entry point address. Call error if it is not known. */ | |
333 | ||
334 | CORE_ADDR | |
335 | entry_point_address (void) | |
336 | { | |
337 | CORE_ADDR retval; | |
338 | ||
339 | if (!entry_point_address_query (&retval)) | |
340 | error (_("Entry point address is not known.")); | |
341 | ||
342 | return retval; | |
9ab9195f | 343 | } |
15831452 | 344 | |
15d123c9 TG |
345 | /* Iterator on PARENT and every separate debug objfile of PARENT. |
346 | The usage pattern is: | |
347 | for (objfile = parent; | |
348 | objfile; | |
349 | objfile = objfile_separate_debug_iterate (parent, objfile)) | |
350 | ... | |
351 | */ | |
352 | ||
353 | struct objfile * | |
354 | objfile_separate_debug_iterate (const struct objfile *parent, | |
355 | const struct objfile *objfile) | |
356 | { | |
357 | struct objfile *res; | |
358 | ||
399f313b | 359 | /* If any, return the first child. */ |
15d123c9 TG |
360 | res = objfile->separate_debug_objfile; |
361 | if (res) | |
362 | return res; | |
363 | ||
15d123c9 TG |
364 | /* Common case where there is no separate debug objfile. */ |
365 | if (objfile == parent) | |
366 | return NULL; | |
367 | ||
399f313b TG |
368 | /* Return the brother if any. Note that we don't iterate on brothers of |
369 | the parents. */ | |
370 | res = objfile->separate_debug_objfile_link; | |
371 | if (res) | |
372 | return res; | |
373 | ||
15d123c9 TG |
374 | for (res = objfile->separate_debug_objfile_backlink; |
375 | res != parent; | |
376 | res = res->separate_debug_objfile_backlink) | |
377 | { | |
378 | gdb_assert (res != NULL); | |
379 | if (res->separate_debug_objfile_link) | |
380 | return res->separate_debug_objfile_link; | |
381 | } | |
382 | return NULL; | |
383 | } | |
15831452 | 384 | |
5b5d99cf JB |
385 | /* Put one object file before a specified on in the global list. |
386 | This can be used to make sure an object file is destroyed before | |
0df8b418 | 387 | another when using ALL_OBJFILES_SAFE to free all objfiles. */ |
5b5d99cf JB |
388 | void |
389 | put_objfile_before (struct objfile *objfile, struct objfile *before_this) | |
390 | { | |
391 | struct objfile **objp; | |
392 | ||
393 | unlink_objfile (objfile); | |
394 | ||
395 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
396 | { | |
397 | if (*objp == before_this) | |
398 | { | |
399 | objfile->next = *objp; | |
400 | *objp = objfile; | |
401 | return; | |
402 | } | |
403 | } | |
404 | ||
405 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 406 | _("put_objfile_before: before objfile not in list")); |
5b5d99cf JB |
407 | } |
408 | ||
c906108c SS |
409 | /* Put OBJFILE at the front of the list. */ |
410 | ||
411 | void | |
fba45db2 | 412 | objfile_to_front (struct objfile *objfile) |
c906108c SS |
413 | { |
414 | struct objfile **objp; | |
415 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
416 | { | |
417 | if (*objp == objfile) | |
418 | { | |
419 | /* Unhook it from where it is. */ | |
420 | *objp = objfile->next; | |
421 | /* Put it in the front. */ | |
422 | objfile->next = object_files; | |
423 | object_files = objfile; | |
424 | break; | |
425 | } | |
426 | } | |
427 | } | |
428 | ||
429 | /* Unlink OBJFILE from the list of known objfiles, if it is found in the | |
430 | list. | |
431 | ||
432 | It is not a bug, or error, to call this function if OBJFILE is not known | |
433 | to be in the current list. This is done in the case of mapped objfiles, | |
434 | for example, just to ensure that the mapped objfile doesn't appear twice | |
435 | in the list. Since the list is threaded, linking in a mapped objfile | |
436 | twice would create a circular list. | |
437 | ||
438 | If OBJFILE turns out to be in the list, we zap it's NEXT pointer after | |
439 | unlinking it, just to ensure that we have completely severed any linkages | |
0df8b418 | 440 | between the OBJFILE and the list. */ |
c906108c SS |
441 | |
442 | void | |
fba45db2 | 443 | unlink_objfile (struct objfile *objfile) |
c906108c | 444 | { |
c5aa993b | 445 | struct objfile **objpp; |
c906108c | 446 | |
c5aa993b | 447 | for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next)) |
c906108c | 448 | { |
c5aa993b | 449 | if (*objpp == objfile) |
c906108c | 450 | { |
c5aa993b JM |
451 | *objpp = (*objpp)->next; |
452 | objfile->next = NULL; | |
07cd4b97 | 453 | return; |
c906108c SS |
454 | } |
455 | } | |
07cd4b97 | 456 | |
8e65ff28 | 457 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 458 | _("unlink_objfile: objfile already unlinked")); |
c906108c SS |
459 | } |
460 | ||
15d123c9 TG |
461 | /* Add OBJFILE as a separate debug objfile of PARENT. */ |
462 | ||
463 | void | |
464 | add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent) | |
465 | { | |
466 | gdb_assert (objfile && parent); | |
467 | ||
468 | /* Must not be already in a list. */ | |
469 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
470 | gdb_assert (objfile->separate_debug_objfile_link == NULL); | |
471 | ||
472 | objfile->separate_debug_objfile_backlink = parent; | |
473 | objfile->separate_debug_objfile_link = parent->separate_debug_objfile; | |
474 | parent->separate_debug_objfile = objfile; | |
475 | ||
476 | /* Put the separate debug object before the normal one, this is so that | |
0df8b418 | 477 | usage of the ALL_OBJFILES_SAFE macro will stay safe. */ |
15d123c9 TG |
478 | put_objfile_before (objfile, parent); |
479 | } | |
480 | ||
481 | /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE | |
482 | itself. */ | |
483 | ||
484 | void | |
485 | free_objfile_separate_debug (struct objfile *objfile) | |
486 | { | |
487 | struct objfile *child; | |
488 | ||
489 | for (child = objfile->separate_debug_objfile; child;) | |
490 | { | |
491 | struct objfile *next_child = child->separate_debug_objfile_link; | |
492 | free_objfile (child); | |
493 | child = next_child; | |
494 | } | |
495 | } | |
c906108c SS |
496 | |
497 | /* Destroy an objfile and all the symtabs and psymtabs under it. Note | |
4a146b47 EZ |
498 | that as much as possible is allocated on the objfile_obstack |
499 | so that the memory can be efficiently freed. | |
c906108c SS |
500 | |
501 | Things which we do NOT free because they are not in malloc'd memory | |
502 | or not in memory specific to the objfile include: | |
503 | ||
c5aa993b | 504 | objfile -> sf |
c906108c SS |
505 | |
506 | FIXME: If the objfile is using reusable symbol information (via mmalloc), | |
507 | then we need to take into account the fact that more than one process | |
508 | may be using the symbol information at the same time (when mmalloc is | |
509 | extended to support cooperative locking). When more than one process | |
510 | is using the mapped symbol info, we need to be more careful about when | |
0df8b418 | 511 | we free objects in the reusable area. */ |
c906108c SS |
512 | |
513 | void | |
fba45db2 | 514 | free_objfile (struct objfile *objfile) |
c906108c | 515 | { |
15d123c9 TG |
516 | /* Free all separate debug objfiles. */ |
517 | free_objfile_separate_debug (objfile); | |
518 | ||
5b5d99cf JB |
519 | if (objfile->separate_debug_objfile_backlink) |
520 | { | |
521 | /* We freed the separate debug file, make sure the base objfile | |
522 | doesn't reference it. */ | |
15d123c9 TG |
523 | struct objfile *child; |
524 | ||
525 | child = objfile->separate_debug_objfile_backlink->separate_debug_objfile; | |
526 | ||
527 | if (child == objfile) | |
528 | { | |
529 | /* OBJFILE is the first child. */ | |
530 | objfile->separate_debug_objfile_backlink->separate_debug_objfile = | |
531 | objfile->separate_debug_objfile_link; | |
532 | } | |
533 | else | |
534 | { | |
535 | /* Find OBJFILE in the list. */ | |
536 | while (1) | |
537 | { | |
538 | if (child->separate_debug_objfile_link == objfile) | |
539 | { | |
540 | child->separate_debug_objfile_link = | |
541 | objfile->separate_debug_objfile_link; | |
542 | break; | |
543 | } | |
544 | child = child->separate_debug_objfile_link; | |
545 | gdb_assert (child); | |
546 | } | |
547 | } | |
5b5d99cf JB |
548 | } |
549 | ||
ae5a43e0 DJ |
550 | /* Remove any references to this objfile in the global value |
551 | lists. */ | |
552 | preserve_values (objfile); | |
553 | ||
9f743ef6 JK |
554 | /* It still may reference data modules have associated with the objfile and |
555 | the symbol file data. */ | |
556 | forget_cached_source_info_for_objfile (objfile); | |
557 | ||
c906108c SS |
558 | /* First do any symbol file specific actions required when we are |
559 | finished with a particular symbol file. Note that if the objfile | |
560 | is using reusable symbol information (via mmalloc) then each of | |
561 | these routines is responsible for doing the correct thing, either | |
562 | freeing things which are valid only during this particular gdb | |
0df8b418 | 563 | execution, or leaving them to be reused during the next one. */ |
c906108c | 564 | |
c5aa993b | 565 | if (objfile->sf != NULL) |
c906108c | 566 | { |
c5aa993b | 567 | (*objfile->sf->sym_finish) (objfile); |
c906108c SS |
568 | } |
569 | ||
9f743ef6 JK |
570 | /* Discard any data modules have associated with the objfile. The function |
571 | still may reference objfile->obfd. */ | |
c5bc3a77 DJ |
572 | objfile_free_data (objfile); |
573 | ||
e3c69974 | 574 | gdb_bfd_unref (objfile->obfd); |
c906108c | 575 | |
0df8b418 | 576 | /* Remove it from the chain of all objfiles. */ |
c906108c SS |
577 | |
578 | unlink_objfile (objfile); | |
579 | ||
adb7f338 JK |
580 | if (objfile == symfile_objfile) |
581 | symfile_objfile = NULL; | |
c906108c SS |
582 | |
583 | if (objfile == rt_common_objfile) | |
584 | rt_common_objfile = NULL; | |
585 | ||
586 | /* Before the symbol table code was redone to make it easier to | |
587 | selectively load and remove information particular to a specific | |
588 | linkage unit, gdb used to do these things whenever the monolithic | |
589 | symbol table was blown away. How much still needs to be done | |
590 | is unknown, but we play it safe for now and keep each action until | |
0df8b418 | 591 | it is shown to be no longer needed. */ |
c5aa993b | 592 | |
cb5d864f FF |
593 | /* Not all our callers call clear_symtab_users (objfile_purge_solibs, |
594 | for example), so we need to call this here. */ | |
c906108c SS |
595 | clear_pc_function_cache (); |
596 | ||
9bdcbae7 DJ |
597 | /* Clear globals which might have pointed into a removed objfile. |
598 | FIXME: It's not clear which of these are supposed to persist | |
599 | between expressions and which ought to be reset each time. */ | |
600 | expression_context_block = NULL; | |
601 | innermost_block = NULL; | |
602 | ||
cb5d864f | 603 | /* Check to see if the current_source_symtab belongs to this objfile, |
0df8b418 | 604 | and if so, call clear_current_source_symtab_and_line. */ |
cb5d864f FF |
605 | |
606 | { | |
607 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
cb5d864f | 608 | |
00174a86 TT |
609 | if (cursal.symtab && cursal.symtab->objfile == objfile) |
610 | clear_current_source_symtab_and_line (); | |
cb5d864f FF |
611 | } |
612 | ||
0df8b418 | 613 | /* The last thing we do is free the objfile struct itself. */ |
c906108c | 614 | |
d31d2fc3 | 615 | xfree (objfile->name); |
78a4a9b9 | 616 | if (objfile->global_psymbols.list) |
2dc74dc1 | 617 | xfree (objfile->global_psymbols.list); |
78a4a9b9 | 618 | if (objfile->static_psymbols.list) |
2dc74dc1 | 619 | xfree (objfile->static_psymbols.list); |
0df8b418 | 620 | /* Free the obstacks for non-reusable objfiles. */ |
710e1a31 | 621 | psymbol_bcache_free (objfile->psymbol_cache); |
78a4a9b9 | 622 | bcache_xfree (objfile->macro_cache); |
10abe6bf | 623 | bcache_xfree (objfile->filename_cache); |
78a4a9b9 AC |
624 | if (objfile->demangled_names_hash) |
625 | htab_delete (objfile->demangled_names_hash); | |
b99607ea | 626 | obstack_free (&objfile->objfile_obstack, 0); |
6c95b8df PA |
627 | |
628 | /* Rebuild section map next time we need it. */ | |
629 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; | |
630 | ||
2dc74dc1 | 631 | xfree (objfile); |
c906108c SS |
632 | } |
633 | ||
74b7792f AC |
634 | static void |
635 | do_free_objfile_cleanup (void *obj) | |
636 | { | |
637 | free_objfile (obj); | |
638 | } | |
639 | ||
640 | struct cleanup * | |
641 | make_cleanup_free_objfile (struct objfile *obj) | |
642 | { | |
643 | return make_cleanup (do_free_objfile_cleanup, obj); | |
644 | } | |
c906108c SS |
645 | |
646 | /* Free all the object files at once and clean up their users. */ | |
647 | ||
648 | void | |
fba45db2 | 649 | free_all_objfiles (void) |
c906108c SS |
650 | { |
651 | struct objfile *objfile, *temp; | |
0133421a JK |
652 | struct so_list *so; |
653 | ||
654 | /* Any objfile referencewould become stale. */ | |
655 | for (so = master_so_list (); so; so = so->next) | |
656 | gdb_assert (so->objfile == NULL); | |
c906108c SS |
657 | |
658 | ALL_OBJFILES_SAFE (objfile, temp) | |
c5aa993b JM |
659 | { |
660 | free_objfile (objfile); | |
661 | } | |
c1e56572 | 662 | clear_symtab_users (0); |
c906108c SS |
663 | } |
664 | \f | |
34eaf542 TT |
665 | /* A helper function for objfile_relocate1 that relocates a single |
666 | symbol. */ | |
667 | ||
668 | static void | |
669 | relocate_one_symbol (struct symbol *sym, struct objfile *objfile, | |
670 | struct section_offsets *delta) | |
671 | { | |
672 | fixup_symbol_section (sym, objfile); | |
673 | ||
674 | /* The RS6000 code from which this was taken skipped | |
675 | any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN. | |
676 | But I'm leaving out that test, on the theory that | |
677 | they can't possibly pass the tests below. */ | |
678 | if ((SYMBOL_CLASS (sym) == LOC_LABEL | |
679 | || SYMBOL_CLASS (sym) == LOC_STATIC) | |
680 | && SYMBOL_SECTION (sym) >= 0) | |
681 | { | |
682 | SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym)); | |
683 | } | |
684 | } | |
685 | ||
c906108c | 686 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS |
b260e109 JK |
687 | entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here. |
688 | Return non-zero iff any change happened. */ | |
567995e1 | 689 | |
b260e109 | 690 | static int |
5cc80db3 MS |
691 | objfile_relocate1 (struct objfile *objfile, |
692 | struct section_offsets *new_offsets) | |
c906108c | 693 | { |
30510692 | 694 | struct obj_section *s; |
d4f3574e | 695 | struct section_offsets *delta = |
a39a16c4 MM |
696 | ((struct section_offsets *) |
697 | alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections))); | |
c906108c | 698 | |
5cc80db3 MS |
699 | int i; |
700 | int something_changed = 0; | |
701 | ||
702 | for (i = 0; i < objfile->num_sections; ++i) | |
703 | { | |
704 | delta->offsets[i] = | |
705 | ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i); | |
706 | if (ANOFFSET (delta, i) != 0) | |
707 | something_changed = 1; | |
708 | } | |
709 | if (!something_changed) | |
710 | return 0; | |
c906108c SS |
711 | |
712 | /* OK, get all the symtabs. */ | |
713 | { | |
714 | struct symtab *s; | |
715 | ||
716 | ALL_OBJFILE_SYMTABS (objfile, s) | |
c5aa993b JM |
717 | { |
718 | struct linetable *l; | |
719 | struct blockvector *bv; | |
720 | int i; | |
721 | ||
722 | /* First the line table. */ | |
723 | l = LINETABLE (s); | |
724 | if (l) | |
725 | { | |
726 | for (i = 0; i < l->nitems; ++i) | |
727 | l->item[i].pc += ANOFFSET (delta, s->block_line_section); | |
728 | } | |
c906108c | 729 | |
c5aa993b JM |
730 | /* Don't relocate a shared blockvector more than once. */ |
731 | if (!s->primary) | |
732 | continue; | |
c906108c | 733 | |
c5aa993b | 734 | bv = BLOCKVECTOR (s); |
b101f7a1 UW |
735 | if (BLOCKVECTOR_MAP (bv)) |
736 | addrmap_relocate (BLOCKVECTOR_MAP (bv), | |
737 | ANOFFSET (delta, s->block_line_section)); | |
738 | ||
c5aa993b JM |
739 | for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i) |
740 | { | |
741 | struct block *b; | |
e88c90f2 | 742 | struct symbol *sym; |
de4f826b | 743 | struct dict_iterator iter; |
c5aa993b JM |
744 | |
745 | b = BLOCKVECTOR_BLOCK (bv, i); | |
746 | BLOCK_START (b) += ANOFFSET (delta, s->block_line_section); | |
747 | BLOCK_END (b) += ANOFFSET (delta, s->block_line_section); | |
748 | ||
de4f826b | 749 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
c5aa993b | 750 | { |
34eaf542 | 751 | relocate_one_symbol (sym, objfile, delta); |
c5aa993b JM |
752 | } |
753 | } | |
754 | } | |
c906108c SS |
755 | } |
756 | ||
34eaf542 TT |
757 | /* Relocate isolated symbols. */ |
758 | { | |
759 | struct symbol *iter; | |
760 | ||
761 | for (iter = objfile->template_symbols; iter; iter = iter->hash_next) | |
762 | relocate_one_symbol (iter, objfile, delta); | |
763 | } | |
764 | ||
9b14d7aa JK |
765 | if (objfile->psymtabs_addrmap) |
766 | addrmap_relocate (objfile->psymtabs_addrmap, | |
767 | ANOFFSET (delta, SECT_OFF_TEXT (objfile))); | |
768 | ||
ccefe4c4 TT |
769 | if (objfile->sf) |
770 | objfile->sf->qf->relocate (objfile, new_offsets, delta); | |
c906108c SS |
771 | |
772 | { | |
773 | struct minimal_symbol *msym; | |
5cc80db3 | 774 | |
c906108c SS |
775 | ALL_OBJFILE_MSYMBOLS (objfile, msym) |
776 | if (SYMBOL_SECTION (msym) >= 0) | |
c5aa993b | 777 | SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym)); |
c906108c SS |
778 | } |
779 | /* Relocating different sections by different amounts may cause the symbols | |
780 | to be out of order. */ | |
781 | msymbols_sort (objfile); | |
782 | ||
abd0a5fa | 783 | if (objfile->ei.entry_point_p) |
36b0c0e0 PS |
784 | { |
785 | /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT | |
786 | only as a fallback. */ | |
787 | struct obj_section *s; | |
788 | s = find_pc_section (objfile->ei.entry_point); | |
789 | if (s) | |
790 | objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index); | |
791 | else | |
792 | objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); | |
793 | } | |
794 | ||
f1f2b5f4 PA |
795 | { |
796 | int i; | |
5cc80db3 | 797 | |
f1f2b5f4 PA |
798 | for (i = 0; i < objfile->num_sections; ++i) |
799 | (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i); | |
800 | } | |
801 | ||
802 | /* Rebuild section map next time we need it. */ | |
6c95b8df | 803 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; |
f1f2b5f4 | 804 | |
30510692 DJ |
805 | /* Update the table in exec_ops, used to read memory. */ |
806 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
807 | { | |
808 | int idx = s->the_bfd_section->index; | |
809 | ||
810 | exec_set_section_address (bfd_get_filename (objfile->obfd), idx, | |
f1f6aadf | 811 | obj_section_addr (s)); |
30510692 | 812 | } |
b260e109 JK |
813 | |
814 | /* Data changed. */ | |
815 | return 1; | |
567995e1 JK |
816 | } |
817 | ||
818 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS | |
819 | entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs. | |
820 | ||
821 | The number and ordering of sections does differ between the two objfiles. | |
822 | Only their names match. Also the file offsets will differ (objfile being | |
823 | possibly prelinked but separate_debug_objfile is probably not prelinked) but | |
824 | the in-memory absolute address as specified by NEW_OFFSETS must match both | |
825 | files. */ | |
826 | ||
827 | void | |
828 | objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets) | |
829 | { | |
830 | struct objfile *debug_objfile; | |
b260e109 | 831 | int changed = 0; |
567995e1 | 832 | |
b260e109 | 833 | changed |= objfile_relocate1 (objfile, new_offsets); |
567995e1 JK |
834 | |
835 | for (debug_objfile = objfile->separate_debug_objfile; | |
836 | debug_objfile; | |
837 | debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile)) | |
838 | { | |
839 | struct section_addr_info *objfile_addrs; | |
840 | struct section_offsets *new_debug_offsets; | |
567995e1 JK |
841 | struct cleanup *my_cleanups; |
842 | ||
843 | objfile_addrs = build_section_addr_info_from_objfile (objfile); | |
844 | my_cleanups = make_cleanup (xfree, objfile_addrs); | |
845 | ||
846 | /* Here OBJFILE_ADDRS contain the correct absolute addresses, the | |
847 | relative ones must be already created according to debug_objfile. */ | |
848 | ||
849 | addr_info_make_relative (objfile_addrs, debug_objfile->obfd); | |
850 | ||
851 | gdb_assert (debug_objfile->num_sections | |
852 | == bfd_count_sections (debug_objfile->obfd)); | |
4fc06681 MS |
853 | new_debug_offsets = |
854 | xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections)); | |
567995e1 JK |
855 | make_cleanup (xfree, new_debug_offsets); |
856 | relative_addr_info_to_section_offsets (new_debug_offsets, | |
857 | debug_objfile->num_sections, | |
858 | objfile_addrs); | |
859 | ||
b260e109 | 860 | changed |= objfile_relocate1 (debug_objfile, new_debug_offsets); |
567995e1 JK |
861 | |
862 | do_cleanups (my_cleanups); | |
863 | } | |
30510692 | 864 | |
0df8b418 | 865 | /* Relocate breakpoints as necessary, after things are relocated. */ |
b260e109 JK |
866 | if (changed) |
867 | breakpoint_re_set (); | |
c906108c SS |
868 | } |
869 | \f | |
55333a84 DE |
870 | /* Return non-zero if OBJFILE has partial symbols. */ |
871 | ||
872 | int | |
873 | objfile_has_partial_symbols (struct objfile *objfile) | |
874 | { | |
b11896a5 TT |
875 | if (!objfile->sf) |
876 | return 0; | |
3e03848b JK |
877 | |
878 | /* If we have not read psymbols, but we have a function capable of reading | |
879 | them, then that is an indication that they are in fact available. Without | |
880 | this function the symbols may have been already read in but they also may | |
881 | not be present in this objfile. */ | |
882 | if ((objfile->flags & OBJF_PSYMTABS_READ) == 0 | |
883 | && objfile->sf->sym_read_psymbols != NULL) | |
884 | return 1; | |
885 | ||
b11896a5 | 886 | return objfile->sf->qf->has_symbols (objfile); |
55333a84 DE |
887 | } |
888 | ||
889 | /* Return non-zero if OBJFILE has full symbols. */ | |
890 | ||
891 | int | |
892 | objfile_has_full_symbols (struct objfile *objfile) | |
893 | { | |
894 | return objfile->symtabs != NULL; | |
895 | } | |
896 | ||
e361b228 | 897 | /* Return non-zero if OBJFILE has full or partial symbols, either directly |
15d123c9 | 898 | or through a separate debug file. */ |
e361b228 TG |
899 | |
900 | int | |
901 | objfile_has_symbols (struct objfile *objfile) | |
902 | { | |
15d123c9 | 903 | struct objfile *o; |
e361b228 | 904 | |
15d123c9 TG |
905 | for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o)) |
906 | if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o)) | |
907 | return 1; | |
e361b228 TG |
908 | return 0; |
909 | } | |
910 | ||
911 | ||
c906108c SS |
912 | /* Many places in gdb want to test just to see if we have any partial |
913 | symbols available. This function returns zero if none are currently | |
0df8b418 | 914 | available, nonzero otherwise. */ |
c906108c SS |
915 | |
916 | int | |
fba45db2 | 917 | have_partial_symbols (void) |
c906108c SS |
918 | { |
919 | struct objfile *ofp; | |
920 | ||
921 | ALL_OBJFILES (ofp) | |
c5aa993b | 922 | { |
55333a84 DE |
923 | if (objfile_has_partial_symbols (ofp)) |
924 | return 1; | |
c5aa993b | 925 | } |
c906108c SS |
926 | return 0; |
927 | } | |
928 | ||
929 | /* Many places in gdb want to test just to see if we have any full | |
930 | symbols available. This function returns zero if none are currently | |
0df8b418 | 931 | available, nonzero otherwise. */ |
c906108c SS |
932 | |
933 | int | |
fba45db2 | 934 | have_full_symbols (void) |
c906108c SS |
935 | { |
936 | struct objfile *ofp; | |
937 | ||
938 | ALL_OBJFILES (ofp) | |
c5aa993b | 939 | { |
55333a84 DE |
940 | if (objfile_has_full_symbols (ofp)) |
941 | return 1; | |
c5aa993b | 942 | } |
c906108c SS |
943 | return 0; |
944 | } | |
945 | ||
946 | ||
947 | /* This operations deletes all objfile entries that represent solibs that | |
948 | weren't explicitly loaded by the user, via e.g., the add-symbol-file | |
0df8b418 MS |
949 | command. */ |
950 | ||
c906108c | 951 | void |
fba45db2 | 952 | objfile_purge_solibs (void) |
c906108c | 953 | { |
c5aa993b JM |
954 | struct objfile *objf; |
955 | struct objfile *temp; | |
c906108c SS |
956 | |
957 | ALL_OBJFILES_SAFE (objf, temp) | |
958 | { | |
959 | /* We assume that the solib package has been purged already, or will | |
0df8b418 MS |
960 | be soon. */ |
961 | ||
2df3850c | 962 | if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED)) |
c906108c SS |
963 | free_objfile (objf); |
964 | } | |
965 | } | |
966 | ||
967 | ||
968 | /* Many places in gdb want to test just to see if we have any minimal | |
969 | symbols available. This function returns zero if none are currently | |
0df8b418 | 970 | available, nonzero otherwise. */ |
c906108c SS |
971 | |
972 | int | |
fba45db2 | 973 | have_minimal_symbols (void) |
c906108c SS |
974 | { |
975 | struct objfile *ofp; | |
976 | ||
977 | ALL_OBJFILES (ofp) | |
c5aa993b | 978 | { |
15831452 | 979 | if (ofp->minimal_symbol_count > 0) |
c5aa993b JM |
980 | { |
981 | return 1; | |
982 | } | |
983 | } | |
c906108c SS |
984 | return 0; |
985 | } | |
986 | ||
a845f5cb PP |
987 | /* Qsort comparison function. */ |
988 | ||
989 | static int | |
990 | qsort_cmp (const void *a, const void *b) | |
991 | { | |
992 | const struct obj_section *sect1 = *(const struct obj_section **) a; | |
993 | const struct obj_section *sect2 = *(const struct obj_section **) b; | |
994 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
995 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
996 | ||
997 | if (sect1_addr < sect2_addr) | |
6fbf07cd | 998 | return -1; |
a845f5cb | 999 | else if (sect1_addr > sect2_addr) |
6fbf07cd PP |
1000 | return 1; |
1001 | else | |
5cc80db3 MS |
1002 | { |
1003 | /* Sections are at the same address. This could happen if | |
1004 | A) we have an objfile and a separate debuginfo. | |
1005 | B) we are confused, and have added sections without proper relocation, | |
0df8b418 | 1006 | or something like that. */ |
5cc80db3 MS |
1007 | |
1008 | const struct objfile *const objfile1 = sect1->objfile; | |
1009 | const struct objfile *const objfile2 = sect2->objfile; | |
1010 | ||
1011 | if (objfile1->separate_debug_objfile == objfile2 | |
1012 | || objfile2->separate_debug_objfile == objfile1) | |
1013 | { | |
1014 | /* Case A. The ordering doesn't matter: separate debuginfo files | |
1015 | will be filtered out later. */ | |
1016 | ||
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | /* Case B. Maintain stable sort order, so bugs in GDB are easier to | |
1021 | triage. This section could be slow (since we iterate over all | |
1022 | objfiles in each call to qsort_cmp), but this shouldn't happen | |
1023 | very often (GDB is already in a confused state; one hopes this | |
1024 | doesn't happen at all). If you discover that significant time is | |
1025 | spent in the loops below, do 'set complaints 100' and examine the | |
1026 | resulting complaints. */ | |
1027 | ||
1028 | if (objfile1 == objfile2) | |
1029 | { | |
1030 | /* Both sections came from the same objfile. We are really confused. | |
1031 | Sort on sequence order of sections within the objfile. */ | |
1032 | ||
1033 | const struct obj_section *osect; | |
1034 | ||
1035 | ALL_OBJFILE_OSECTIONS (objfile1, osect) | |
1036 | if (osect == sect1) | |
1037 | return -1; | |
1038 | else if (osect == sect2) | |
1039 | return 1; | |
1040 | ||
1041 | /* We should have found one of the sections before getting here. */ | |
f3574227 | 1042 | gdb_assert_not_reached ("section not found"); |
5cc80db3 MS |
1043 | } |
1044 | else | |
1045 | { | |
1046 | /* Sort on sequence number of the objfile in the chain. */ | |
1047 | ||
1048 | const struct objfile *objfile; | |
1049 | ||
1050 | ALL_OBJFILES (objfile) | |
1051 | if (objfile == objfile1) | |
1052 | return -1; | |
1053 | else if (objfile == objfile2) | |
1054 | return 1; | |
1055 | ||
1056 | /* We should have found one of the objfiles before getting here. */ | |
f3574227 | 1057 | gdb_assert_not_reached ("objfile not found"); |
5cc80db3 MS |
1058 | } |
1059 | } | |
6fbf07cd PP |
1060 | |
1061 | /* Unreachable. */ | |
f3574227 | 1062 | gdb_assert_not_reached ("unexpected code path"); |
a845f5cb PP |
1063 | return 0; |
1064 | } | |
1065 | ||
3aad21cf PP |
1066 | /* Select "better" obj_section to keep. We prefer the one that came from |
1067 | the real object, rather than the one from separate debuginfo. | |
1068 | Most of the time the two sections are exactly identical, but with | |
1069 | prelinking the .rel.dyn section in the real object may have different | |
1070 | size. */ | |
1071 | ||
1072 | static struct obj_section * | |
1073 | preferred_obj_section (struct obj_section *a, struct obj_section *b) | |
1074 | { | |
1075 | gdb_assert (obj_section_addr (a) == obj_section_addr (b)); | |
1076 | gdb_assert ((a->objfile->separate_debug_objfile == b->objfile) | |
1077 | || (b->objfile->separate_debug_objfile == a->objfile)); | |
1078 | gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile) | |
1079 | || (b->objfile->separate_debug_objfile_backlink == a->objfile)); | |
1080 | ||
1081 | if (a->objfile->separate_debug_objfile != NULL) | |
1082 | return a; | |
1083 | return b; | |
1084 | } | |
1085 | ||
6fbf07cd PP |
1086 | /* Return 1 if SECTION should be inserted into the section map. |
1087 | We want to insert only non-overlay and non-TLS section. */ | |
1088 | ||
1089 | static int | |
1090 | insert_section_p (const struct bfd *abfd, | |
1091 | const struct bfd_section *section) | |
1092 | { | |
1093 | const bfd_vma lma = bfd_section_lma (abfd, section); | |
1094 | ||
50f8ea94 | 1095 | if (overlay_debugging && lma != 0 && lma != bfd_section_vma (abfd, section) |
6fbf07cd PP |
1096 | && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0) |
1097 | /* This is an overlay section. IN_MEMORY check is needed to avoid | |
1098 | discarding sections from the "system supplied DSO" (aka vdso) | |
1099 | on some Linux systems (e.g. Fedora 11). */ | |
1100 | return 0; | |
1101 | if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0) | |
1102 | /* This is a TLS section. */ | |
1103 | return 0; | |
1104 | ||
1105 | return 1; | |
1106 | } | |
1107 | ||
1108 | /* Filter out overlapping sections where one section came from the real | |
1109 | objfile, and the other from a separate debuginfo file. | |
1110 | Return the size of table after redundant sections have been eliminated. */ | |
1111 | ||
1112 | static int | |
1113 | filter_debuginfo_sections (struct obj_section **map, int map_size) | |
1114 | { | |
1115 | int i, j; | |
1116 | ||
1117 | for (i = 0, j = 0; i < map_size - 1; i++) | |
1118 | { | |
1119 | struct obj_section *const sect1 = map[i]; | |
1120 | struct obj_section *const sect2 = map[i + 1]; | |
1121 | const struct objfile *const objfile1 = sect1->objfile; | |
1122 | const struct objfile *const objfile2 = sect2->objfile; | |
1123 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1124 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1125 | ||
1126 | if (sect1_addr == sect2_addr | |
1127 | && (objfile1->separate_debug_objfile == objfile2 | |
1128 | || objfile2->separate_debug_objfile == objfile1)) | |
1129 | { | |
1130 | map[j++] = preferred_obj_section (sect1, sect2); | |
1131 | ++i; | |
1132 | } | |
1133 | else | |
1134 | map[j++] = sect1; | |
1135 | } | |
1136 | ||
1137 | if (i < map_size) | |
1138 | { | |
1139 | gdb_assert (i == map_size - 1); | |
1140 | map[j++] = map[i]; | |
1141 | } | |
1142 | ||
1143 | /* The map should not have shrunk to less than half the original size. */ | |
1144 | gdb_assert (map_size / 2 <= j); | |
1145 | ||
1146 | return j; | |
1147 | } | |
1148 | ||
1149 | /* Filter out overlapping sections, issuing a warning if any are found. | |
1150 | Overlapping sections could really be overlay sections which we didn't | |
1151 | classify as such in insert_section_p, or we could be dealing with a | |
1152 | corrupt binary. */ | |
1153 | ||
1154 | static int | |
1155 | filter_overlapping_sections (struct obj_section **map, int map_size) | |
1156 | { | |
1157 | int i, j; | |
1158 | ||
1159 | for (i = 0, j = 0; i < map_size - 1; ) | |
1160 | { | |
1161 | int k; | |
1162 | ||
1163 | map[j++] = map[i]; | |
1164 | for (k = i + 1; k < map_size; k++) | |
1165 | { | |
1166 | struct obj_section *const sect1 = map[i]; | |
1167 | struct obj_section *const sect2 = map[k]; | |
1168 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1169 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1170 | const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1); | |
1171 | ||
1172 | gdb_assert (sect1_addr <= sect2_addr); | |
1173 | ||
1174 | if (sect1_endaddr <= sect2_addr) | |
1175 | break; | |
1176 | else | |
1177 | { | |
1178 | /* We have an overlap. Report it. */ | |
1179 | ||
1180 | struct objfile *const objf1 = sect1->objfile; | |
1181 | struct objfile *const objf2 = sect2->objfile; | |
1182 | ||
1183 | const struct bfd *const abfd1 = objf1->obfd; | |
1184 | const struct bfd *const abfd2 = objf2->obfd; | |
1185 | ||
1186 | const struct bfd_section *const bfds1 = sect1->the_bfd_section; | |
1187 | const struct bfd_section *const bfds2 = sect2->the_bfd_section; | |
1188 | ||
1189 | const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2); | |
1190 | ||
1191 | struct gdbarch *const gdbarch = get_objfile_arch (objf1); | |
1192 | ||
1193 | complaint (&symfile_complaints, | |
1194 | _("unexpected overlap between:\n" | |
1195 | " (A) section `%s' from `%s' [%s, %s)\n" | |
1196 | " (B) section `%s' from `%s' [%s, %s).\n" | |
1197 | "Will ignore section B"), | |
1198 | bfd_section_name (abfd1, bfds1), objf1->name, | |
1199 | paddress (gdbarch, sect1_addr), | |
1200 | paddress (gdbarch, sect1_endaddr), | |
1201 | bfd_section_name (abfd2, bfds2), objf2->name, | |
1202 | paddress (gdbarch, sect2_addr), | |
1203 | paddress (gdbarch, sect2_endaddr)); | |
1204 | } | |
1205 | } | |
1206 | i = k; | |
1207 | } | |
1208 | ||
1209 | if (i < map_size) | |
1210 | { | |
1211 | gdb_assert (i == map_size - 1); | |
1212 | map[j++] = map[i]; | |
1213 | } | |
1214 | ||
1215 | return j; | |
1216 | } | |
1217 | ||
1218 | ||
1219 | /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any | |
1220 | TLS, overlay and overlapping sections. */ | |
a845f5cb PP |
1221 | |
1222 | static void | |
6c95b8df PA |
1223 | update_section_map (struct program_space *pspace, |
1224 | struct obj_section ***pmap, int *pmap_size) | |
a845f5cb | 1225 | { |
6fbf07cd | 1226 | int alloc_size, map_size, i; |
a845f5cb PP |
1227 | struct obj_section *s, **map; |
1228 | struct objfile *objfile; | |
1229 | ||
6c95b8df | 1230 | gdb_assert (get_objfile_pspace_data (pspace)->objfiles_changed_p != 0); |
a845f5cb PP |
1231 | |
1232 | map = *pmap; | |
1233 | xfree (map); | |
1234 | ||
6fbf07cd | 1235 | alloc_size = 0; |
6c95b8df PA |
1236 | ALL_PSPACE_OBJFILES (pspace, objfile) |
1237 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
1238 | if (insert_section_p (objfile->obfd, s->the_bfd_section)) | |
1239 | alloc_size += 1; | |
a845f5cb | 1240 | |
65a97ab3 PP |
1241 | /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */ |
1242 | if (alloc_size == 0) | |
1243 | { | |
1244 | *pmap = NULL; | |
1245 | *pmap_size = 0; | |
1246 | return; | |
1247 | } | |
1248 | ||
6fbf07cd | 1249 | map = xmalloc (alloc_size * sizeof (*map)); |
a845f5cb | 1250 | |
3aad21cf | 1251 | i = 0; |
6c95b8df PA |
1252 | ALL_PSPACE_OBJFILES (pspace, objfile) |
1253 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
1254 | if (insert_section_p (objfile->obfd, s->the_bfd_section)) | |
1255 | map[i++] = s; | |
a845f5cb | 1256 | |
6fbf07cd PP |
1257 | qsort (map, alloc_size, sizeof (*map), qsort_cmp); |
1258 | map_size = filter_debuginfo_sections(map, alloc_size); | |
1259 | map_size = filter_overlapping_sections(map, map_size); | |
a845f5cb | 1260 | |
6fbf07cd PP |
1261 | if (map_size < alloc_size) |
1262 | /* Some sections were eliminated. Trim excess space. */ | |
1263 | map = xrealloc (map, map_size * sizeof (*map)); | |
3aad21cf | 1264 | else |
6fbf07cd | 1265 | gdb_assert (alloc_size == map_size); |
3aad21cf | 1266 | |
a845f5cb PP |
1267 | *pmap = map; |
1268 | *pmap_size = map_size; | |
1269 | } | |
1270 | ||
0df8b418 | 1271 | /* Bsearch comparison function. */ |
a845f5cb PP |
1272 | |
1273 | static int | |
1274 | bsearch_cmp (const void *key, const void *elt) | |
1275 | { | |
1276 | const CORE_ADDR pc = *(CORE_ADDR *) key; | |
1277 | const struct obj_section *section = *(const struct obj_section **) elt; | |
1278 | ||
1279 | if (pc < obj_section_addr (section)) | |
1280 | return -1; | |
1281 | if (pc < obj_section_endaddr (section)) | |
1282 | return 0; | |
1283 | return 1; | |
1284 | } | |
1285 | ||
714835d5 | 1286 | /* Returns a section whose range includes PC or NULL if none found. */ |
c906108c SS |
1287 | |
1288 | struct obj_section * | |
714835d5 | 1289 | find_pc_section (CORE_ADDR pc) |
c906108c | 1290 | { |
6c95b8df | 1291 | struct objfile_pspace_info *pspace_info; |
a845f5cb | 1292 | struct obj_section *s, **sp; |
c5aa993b | 1293 | |
714835d5 UW |
1294 | /* Check for mapped overlay section first. */ |
1295 | s = find_pc_mapped_section (pc); | |
1296 | if (s) | |
1297 | return s; | |
c906108c | 1298 | |
6c95b8df PA |
1299 | pspace_info = get_objfile_pspace_data (current_program_space); |
1300 | if (pspace_info->objfiles_changed_p != 0) | |
a845f5cb | 1301 | { |
6c95b8df PA |
1302 | update_section_map (current_program_space, |
1303 | &pspace_info->sections, | |
1304 | &pspace_info->num_sections); | |
c906108c | 1305 | |
6c95b8df PA |
1306 | /* Don't need updates to section map until objfiles are added, |
1307 | removed or relocated. */ | |
1308 | pspace_info->objfiles_changed_p = 0; | |
a845f5cb PP |
1309 | } |
1310 | ||
65a97ab3 PP |
1311 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1312 | bsearch be non-NULL. */ | |
1313 | if (pspace_info->sections == NULL) | |
1314 | { | |
1315 | gdb_assert (pspace_info->num_sections == 0); | |
1316 | return NULL; | |
1317 | } | |
1318 | ||
6c95b8df PA |
1319 | sp = (struct obj_section **) bsearch (&pc, |
1320 | pspace_info->sections, | |
1321 | pspace_info->num_sections, | |
1322 | sizeof (*pspace_info->sections), | |
1323 | bsearch_cmp); | |
a845f5cb PP |
1324 | if (sp != NULL) |
1325 | return *sp; | |
714835d5 | 1326 | return NULL; |
c906108c | 1327 | } |
c5aa993b | 1328 | |
c906108c SS |
1329 | |
1330 | /* In SVR4, we recognize a trampoline by it's section name. | |
1331 | That is, if the pc is in a section named ".plt" then we are in | |
1332 | a trampoline. */ | |
1333 | ||
1334 | int | |
fba45db2 | 1335 | in_plt_section (CORE_ADDR pc, char *name) |
c906108c SS |
1336 | { |
1337 | struct obj_section *s; | |
1338 | int retval = 0; | |
c5aa993b JM |
1339 | |
1340 | s = find_pc_section (pc); | |
1341 | ||
c906108c SS |
1342 | retval = (s != NULL |
1343 | && s->the_bfd_section->name != NULL | |
6314a349 | 1344 | && strcmp (s->the_bfd_section->name, ".plt") == 0); |
c5aa993b | 1345 | return (retval); |
c906108c | 1346 | } |
0d0e1a63 MK |
1347 | \f |
1348 | ||
1349 | /* Keep a registry of per-objfile data-pointers required by other GDB | |
1350 | modules. */ | |
1351 | ||
1352 | struct objfile_data | |
1353 | { | |
1354 | unsigned index; | |
c1bd65d0 DE |
1355 | void (*save) (struct objfile *, void *); |
1356 | void (*free) (struct objfile *, void *); | |
0d0e1a63 MK |
1357 | }; |
1358 | ||
1359 | struct objfile_data_registration | |
1360 | { | |
1361 | struct objfile_data *data; | |
1362 | struct objfile_data_registration *next; | |
1363 | }; | |
1364 | ||
1365 | struct objfile_data_registry | |
1366 | { | |
1367 | struct objfile_data_registration *registrations; | |
1368 | unsigned num_registrations; | |
1369 | }; | |
1370 | ||
1371 | static struct objfile_data_registry objfile_data_registry = { NULL, 0 }; | |
1372 | ||
1373 | const struct objfile_data * | |
c1bd65d0 DE |
1374 | register_objfile_data_with_cleanup (void (*save) (struct objfile *, void *), |
1375 | void (*free) (struct objfile *, void *)) | |
0d0e1a63 MK |
1376 | { |
1377 | struct objfile_data_registration **curr; | |
1378 | ||
1379 | /* Append new registration. */ | |
1380 | for (curr = &objfile_data_registry.registrations; | |
1381 | *curr != NULL; curr = &(*curr)->next); | |
7be570e7 | 1382 | |
0d0e1a63 MK |
1383 | *curr = XMALLOC (struct objfile_data_registration); |
1384 | (*curr)->next = NULL; | |
1385 | (*curr)->data = XMALLOC (struct objfile_data); | |
1386 | (*curr)->data->index = objfile_data_registry.num_registrations++; | |
c1bd65d0 DE |
1387 | (*curr)->data->save = save; |
1388 | (*curr)->data->free = free; | |
0d0e1a63 MK |
1389 | |
1390 | return (*curr)->data; | |
1391 | } | |
1392 | ||
60c5725c DJ |
1393 | const struct objfile_data * |
1394 | register_objfile_data (void) | |
1395 | { | |
c1bd65d0 | 1396 | return register_objfile_data_with_cleanup (NULL, NULL); |
60c5725c DJ |
1397 | } |
1398 | ||
0d0e1a63 MK |
1399 | static void |
1400 | objfile_alloc_data (struct objfile *objfile) | |
1401 | { | |
1402 | gdb_assert (objfile->data == NULL); | |
1403 | objfile->num_data = objfile_data_registry.num_registrations; | |
1404 | objfile->data = XCALLOC (objfile->num_data, void *); | |
1405 | } | |
1406 | ||
1407 | static void | |
1408 | objfile_free_data (struct objfile *objfile) | |
1409 | { | |
1410 | gdb_assert (objfile->data != NULL); | |
60c5725c | 1411 | clear_objfile_data (objfile); |
0d0e1a63 MK |
1412 | xfree (objfile->data); |
1413 | objfile->data = NULL; | |
1414 | } | |
1415 | ||
7b097ae3 MK |
1416 | void |
1417 | clear_objfile_data (struct objfile *objfile) | |
1418 | { | |
60c5725c DJ |
1419 | struct objfile_data_registration *registration; |
1420 | int i; | |
1421 | ||
7b097ae3 | 1422 | gdb_assert (objfile->data != NULL); |
60c5725c | 1423 | |
c1bd65d0 DE |
1424 | /* Process all the save handlers. */ |
1425 | ||
1426 | for (registration = objfile_data_registry.registrations, i = 0; | |
1427 | i < objfile->num_data; | |
1428 | registration = registration->next, i++) | |
1429 | if (objfile->data[i] != NULL && registration->data->save != NULL) | |
1430 | registration->data->save (objfile, objfile->data[i]); | |
1431 | ||
1432 | /* Now process all the free handlers. */ | |
1433 | ||
60c5725c DJ |
1434 | for (registration = objfile_data_registry.registrations, i = 0; |
1435 | i < objfile->num_data; | |
1436 | registration = registration->next, i++) | |
c1bd65d0 DE |
1437 | if (objfile->data[i] != NULL && registration->data->free != NULL) |
1438 | registration->data->free (objfile, objfile->data[i]); | |
60c5725c | 1439 | |
7b097ae3 MK |
1440 | memset (objfile->data, 0, objfile->num_data * sizeof (void *)); |
1441 | } | |
1442 | ||
0d0e1a63 MK |
1443 | void |
1444 | set_objfile_data (struct objfile *objfile, const struct objfile_data *data, | |
1445 | void *value) | |
1446 | { | |
1447 | gdb_assert (data->index < objfile->num_data); | |
1448 | objfile->data[data->index] = value; | |
1449 | } | |
1450 | ||
1451 | void * | |
1452 | objfile_data (struct objfile *objfile, const struct objfile_data *data) | |
1453 | { | |
1454 | gdb_assert (data->index < objfile->num_data); | |
1455 | return objfile->data[data->index]; | |
1456 | } | |
a845f5cb | 1457 | |
bb272892 PP |
1458 | /* Set objfiles_changed_p so section map will be rebuilt next time it |
1459 | is used. Called by reread_symbols. */ | |
a845f5cb PP |
1460 | |
1461 | void | |
bb272892 | 1462 | objfiles_changed (void) |
a845f5cb | 1463 | { |
6c95b8df PA |
1464 | /* Rebuild section map next time we need it. */ |
1465 | get_objfile_pspace_data (current_program_space)->objfiles_changed_p = 1; | |
a845f5cb | 1466 | } |
e3c69974 | 1467 | |
516ba659 PA |
1468 | /* Close ABFD, and warn if that fails. */ |
1469 | ||
1470 | int | |
1471 | gdb_bfd_close_or_warn (struct bfd *abfd) | |
1472 | { | |
1473 | int ret; | |
1474 | char *name = bfd_get_filename (abfd); | |
1475 | ||
1476 | ret = bfd_close (abfd); | |
1477 | ||
1478 | if (!ret) | |
1479 | warning (_("cannot close \"%s\": %s"), | |
1480 | name, bfd_errmsg (bfd_get_error ())); | |
1481 | ||
1482 | return ret; | |
1483 | } | |
1484 | ||
3db741ef PP |
1485 | /* Add reference to ABFD. Returns ABFD. */ |
1486 | struct bfd * | |
1487 | gdb_bfd_ref (struct bfd *abfd) | |
1488 | { | |
6f451e5e TT |
1489 | int *p_refcount; |
1490 | ||
1491 | if (abfd == NULL) | |
1492 | return NULL; | |
1493 | ||
1494 | p_refcount = bfd_usrdata (abfd); | |
3db741ef PP |
1495 | |
1496 | if (p_refcount != NULL) | |
1497 | { | |
1498 | *p_refcount += 1; | |
1499 | return abfd; | |
1500 | } | |
1501 | ||
1502 | p_refcount = xmalloc (sizeof (*p_refcount)); | |
1503 | *p_refcount = 1; | |
1504 | bfd_usrdata (abfd) = p_refcount; | |
1505 | ||
1506 | return abfd; | |
1507 | } | |
1508 | ||
1509 | /* Unreference and possibly close ABFD. */ | |
e3c69974 PP |
1510 | void |
1511 | gdb_bfd_unref (struct bfd *abfd) | |
1512 | { | |
1513 | int *p_refcount; | |
1514 | char *name; | |
1515 | ||
1516 | if (abfd == NULL) | |
1517 | return; | |
1518 | ||
4f6f9936 | 1519 | p_refcount = bfd_usrdata (abfd); |
e3c69974 | 1520 | |
3db741ef PP |
1521 | /* Valid range for p_refcount: a pointer to int counter, which has a |
1522 | value of 1 (single owner) or 2 (shared). */ | |
1523 | gdb_assert (*p_refcount == 1 || *p_refcount == 2); | |
1524 | ||
1525 | *p_refcount -= 1; | |
1526 | if (*p_refcount > 0) | |
1527 | return; | |
e3c69974 | 1528 | |
e3c69974 | 1529 | xfree (p_refcount); |
4f6f9936 | 1530 | bfd_usrdata (abfd) = NULL; /* Paranoia. */ |
e3c69974 PP |
1531 | |
1532 | name = bfd_get_filename (abfd); | |
516ba659 | 1533 | gdb_bfd_close_or_warn (abfd); |
e3c69974 PP |
1534 | xfree (name); |
1535 | } | |
6c95b8df PA |
1536 | |
1537 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
1538 | extern initialize_file_ftype _initialize_objfiles; | |
1539 | ||
1540 | void | |
1541 | _initialize_objfiles (void) | |
1542 | { | |
1543 | objfiles_pspace_data | |
1544 | = register_program_space_data_with_cleanup (objfiles_pspace_data_cleanup); | |
1545 | } |