Commit | Line | Data |
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c906108c | 1 | /* GDB routines for manipulating objfiles. |
af5f3db6 | 2 | |
6aba47ca | 3 | Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, |
7b6bb8da JB |
4 | 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011 |
5 | Free Software Foundation, Inc. | |
af5f3db6 | 6 | |
c906108c SS |
7 | Contributed by Cygnus Support, using pieces from other GDB modules. |
8 | ||
c5aa993b | 9 | This file is part of GDB. |
c906108c | 10 | |
c5aa993b JM |
11 | This program is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 13 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 14 | (at your option) any later version. |
c906108c | 15 | |
c5aa993b JM |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
c906108c | 20 | |
c5aa993b | 21 | You should have received a copy of the GNU General Public License |
a9762ec7 | 22 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
23 | |
24 | /* This file contains support routines for creating, manipulating, and | |
0df8b418 | 25 | destroying objfile structures. */ |
c906108c SS |
26 | |
27 | #include "defs.h" | |
28 | #include "bfd.h" /* Binary File Description */ | |
29 | #include "symtab.h" | |
30 | #include "symfile.h" | |
31 | #include "objfiles.h" | |
32 | #include "gdb-stabs.h" | |
33 | #include "target.h" | |
af5f3db6 | 34 | #include "bcache.h" |
5b123146 | 35 | #include "mdebugread.h" |
9bdcbae7 DJ |
36 | #include "expression.h" |
37 | #include "parser-defs.h" | |
38 | ||
0d0e1a63 | 39 | #include "gdb_assert.h" |
c906108c SS |
40 | #include <sys/types.h> |
41 | #include "gdb_stat.h" | |
42 | #include <fcntl.h> | |
04ea0df1 | 43 | #include "gdb_obstack.h" |
c906108c | 44 | #include "gdb_string.h" |
2de7ced7 | 45 | #include "hashtab.h" |
c906108c | 46 | |
7a292a7a | 47 | #include "breakpoint.h" |
fe898f56 | 48 | #include "block.h" |
de4f826b | 49 | #include "dictionary.h" |
cb5d864f | 50 | #include "source.h" |
801e3a5b | 51 | #include "addrmap.h" |
5e2b427d | 52 | #include "arch-utils.h" |
30510692 | 53 | #include "exec.h" |
a845f5cb | 54 | #include "observer.h" |
6fbf07cd | 55 | #include "complaints.h" |
ccefe4c4 | 56 | #include "psymtab.h" |
0133421a | 57 | #include "solist.h" |
7a292a7a | 58 | |
c906108c SS |
59 | /* Prototypes for local functions */ |
60 | ||
0d0e1a63 MK |
61 | static void objfile_alloc_data (struct objfile *objfile); |
62 | static void objfile_free_data (struct objfile *objfile); | |
63 | ||
c906108c | 64 | /* Externally visible variables that are owned by this module. |
0df8b418 | 65 | See declarations in objfile.h for more info. */ |
c906108c | 66 | |
c906108c SS |
67 | struct objfile *rt_common_objfile; /* For runtime common symbols */ |
68 | ||
6c95b8df PA |
69 | struct objfile_pspace_info |
70 | { | |
71 | int objfiles_changed_p; | |
72 | struct obj_section **sections; | |
73 | int num_sections; | |
74 | }; | |
75 | ||
76 | /* Per-program-space data key. */ | |
77 | static const struct program_space_data *objfiles_pspace_data; | |
78 | ||
79 | static void | |
80 | objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
81 | { | |
82 | struct objfile_pspace_info *info; | |
83 | ||
84 | info = program_space_data (pspace, objfiles_pspace_data); | |
85 | if (info != NULL) | |
86 | { | |
87 | xfree (info->sections); | |
88 | xfree (info); | |
89 | } | |
90 | } | |
91 | ||
92 | /* Get the current svr4 data. If none is found yet, add it now. This | |
93 | function always returns a valid object. */ | |
94 | ||
95 | static struct objfile_pspace_info * | |
96 | get_objfile_pspace_data (struct program_space *pspace) | |
97 | { | |
98 | struct objfile_pspace_info *info; | |
99 | ||
100 | info = program_space_data (pspace, objfiles_pspace_data); | |
101 | if (info == NULL) | |
102 | { | |
103 | info = XZALLOC (struct objfile_pspace_info); | |
104 | set_program_space_data (pspace, objfiles_pspace_data, info); | |
105 | } | |
106 | ||
107 | return info; | |
108 | } | |
109 | ||
a845f5cb PP |
110 | /* Records whether any objfiles appeared or disappeared since we last updated |
111 | address to obj section map. */ | |
112 | ||
0df8b418 | 113 | /* Locate all mappable sections of a BFD file. |
c906108c SS |
114 | objfile_p_char is a char * to get it through |
115 | bfd_map_over_sections; we cast it back to its proper type. */ | |
116 | ||
96baa820 JM |
117 | /* Called via bfd_map_over_sections to build up the section table that |
118 | the objfile references. The objfile contains pointers to the start | |
119 | of the table (objfile->sections) and to the first location after | |
0df8b418 | 120 | the end of the table (objfile->sections_end). */ |
96baa820 | 121 | |
c906108c | 122 | static void |
7be0c536 AC |
123 | add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect, |
124 | void *objfile_p_char) | |
c906108c SS |
125 | { |
126 | struct objfile *objfile = (struct objfile *) objfile_p_char; | |
127 | struct obj_section section; | |
128 | flagword aflag; | |
129 | ||
130 | aflag = bfd_get_section_flags (abfd, asect); | |
131 | ||
ed7c5e43 | 132 | if (!(aflag & SEC_ALLOC)) |
c906108c SS |
133 | return; |
134 | ||
135 | if (0 == bfd_section_size (abfd, asect)) | |
136 | return; | |
c906108c SS |
137 | section.objfile = objfile; |
138 | section.the_bfd_section = asect; | |
139 | section.ovly_mapped = 0; | |
3e43a32a MS |
140 | obstack_grow (&objfile->objfile_obstack, |
141 | (char *) §ion, sizeof (section)); | |
f1f6aadf PA |
142 | objfile->sections_end |
143 | = (struct obj_section *) (((size_t) objfile->sections_end) + 1); | |
c906108c SS |
144 | } |
145 | ||
146 | /* Builds a section table for OBJFILE. | |
147 | Returns 0 if OK, 1 on error (in which case bfd_error contains the | |
96baa820 JM |
148 | error). |
149 | ||
150 | Note that while we are building the table, which goes into the | |
151 | psymbol obstack, we hijack the sections_end pointer to instead hold | |
152 | a count of the number of sections. When bfd_map_over_sections | |
153 | returns, this count is used to compute the pointer to the end of | |
154 | the sections table, which then overwrites the count. | |
155 | ||
156 | Also note that the OFFSET and OVLY_MAPPED in each table entry | |
157 | are initialized to zero. | |
158 | ||
159 | Also note that if anything else writes to the psymbol obstack while | |
0df8b418 | 160 | we are building the table, we're pretty much hosed. */ |
c906108c SS |
161 | |
162 | int | |
fba45db2 | 163 | build_objfile_section_table (struct objfile *objfile) |
c906108c | 164 | { |
c906108c | 165 | objfile->sections_end = 0; |
f1f6aadf PA |
166 | bfd_map_over_sections (objfile->obfd, |
167 | add_to_objfile_sections, (void *) objfile); | |
168 | objfile->sections = obstack_finish (&objfile->objfile_obstack); | |
169 | objfile->sections_end = objfile->sections + (size_t) objfile->sections_end; | |
c5aa993b | 170 | return (0); |
c906108c SS |
171 | } |
172 | ||
2df3850c JM |
173 | /* Given a pointer to an initialized bfd (ABFD) and some flag bits |
174 | allocate a new objfile struct, fill it in as best we can, link it | |
175 | into the list of all known objfiles, and return a pointer to the | |
176 | new objfile struct. | |
c906108c | 177 | |
2df3850c | 178 | The FLAGS word contains various bits (OBJF_*) that can be taken as |
78a4a9b9 | 179 | requests for specific operations. Other bits like OBJF_SHARED are |
0df8b418 | 180 | simply copied through to the new objfile flags member. */ |
c906108c | 181 | |
eb9a305d DC |
182 | /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0 |
183 | by jv-lang.c, to create an artificial objfile used to hold | |
184 | information about dynamically-loaded Java classes. Unfortunately, | |
185 | that branch of this function doesn't get tested very frequently, so | |
186 | it's prone to breakage. (E.g. at one time the name was set to NULL | |
187 | in that situation, which broke a loop over all names in the dynamic | |
188 | library loader.) If you change this function, please try to leave | |
189 | things in a consistent state even if abfd is NULL. */ | |
190 | ||
c906108c | 191 | struct objfile * |
fba45db2 | 192 | allocate_objfile (bfd *abfd, int flags) |
c906108c | 193 | { |
2f6e5d7e | 194 | struct objfile *objfile; |
c906108c | 195 | |
6a0fa043 | 196 | objfile = (struct objfile *) xzalloc (sizeof (struct objfile)); |
710e1a31 | 197 | objfile->psymbol_cache = psymbol_bcache_init (); |
cbd70537 SW |
198 | objfile->macro_cache = bcache_xmalloc (NULL, NULL); |
199 | objfile->filename_cache = bcache_xmalloc (NULL, NULL); | |
2f6e5d7e TG |
200 | /* We could use obstack_specify_allocation here instead, but |
201 | gdb_obstack.h specifies the alloc/dealloc functions. */ | |
202 | obstack_init (&objfile->objfile_obstack); | |
203 | terminate_minimal_symbol_table (objfile); | |
c906108c | 204 | |
0d0e1a63 MK |
205 | objfile_alloc_data (objfile); |
206 | ||
c906108c SS |
207 | /* Update the per-objfile information that comes from the bfd, ensuring |
208 | that any data that is reference is saved in the per-objfile data | |
0df8b418 | 209 | region. */ |
c906108c | 210 | |
3db741ef | 211 | objfile->obfd = gdb_bfd_ref (abfd); |
c906108c SS |
212 | if (abfd != NULL) |
213 | { | |
5e2b427d UW |
214 | /* Look up the gdbarch associated with the BFD. */ |
215 | objfile->gdbarch = gdbarch_from_bfd (abfd); | |
216 | ||
982526a1 | 217 | objfile->name = xstrdup (bfd_get_filename (abfd)); |
c5aa993b | 218 | objfile->mtime = bfd_get_mtime (abfd); |
c906108c SS |
219 | |
220 | /* Build section table. */ | |
221 | ||
222 | if (build_objfile_section_table (objfile)) | |
223 | { | |
8a3fe4f8 | 224 | error (_("Can't find the file sections in `%s': %s"), |
c5aa993b | 225 | objfile->name, bfd_errmsg (bfd_get_error ())); |
c906108c SS |
226 | } |
227 | } | |
eb9a305d DC |
228 | else |
229 | { | |
982526a1 | 230 | objfile->name = xstrdup ("<<anonymous objfile>>"); |
eb9a305d | 231 | } |
c906108c | 232 | |
6c95b8df PA |
233 | objfile->pspace = current_program_space; |
234 | ||
b8fbeb18 | 235 | /* Initialize the section indexes for this objfile, so that we can |
0df8b418 | 236 | later detect if they are used w/o being properly assigned to. */ |
b8fbeb18 | 237 | |
5c4e30ca DC |
238 | objfile->sect_index_text = -1; |
239 | objfile->sect_index_data = -1; | |
240 | objfile->sect_index_bss = -1; | |
241 | objfile->sect_index_rodata = -1; | |
242 | ||
0df8b418 | 243 | /* Add this file onto the tail of the linked list of other such files. */ |
c906108c | 244 | |
c5aa993b | 245 | objfile->next = NULL; |
c906108c SS |
246 | if (object_files == NULL) |
247 | object_files = objfile; | |
248 | else | |
249 | { | |
2f6e5d7e TG |
250 | struct objfile *last_one; |
251 | ||
c906108c | 252 | for (last_one = object_files; |
c5aa993b JM |
253 | last_one->next; |
254 | last_one = last_one->next); | |
255 | last_one->next = objfile; | |
c906108c SS |
256 | } |
257 | ||
0df8b418 | 258 | /* Save passed in flag bits. */ |
2df3850c | 259 | objfile->flags |= flags; |
c906108c | 260 | |
6c95b8df PA |
261 | /* Rebuild section map next time we need it. */ |
262 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; | |
bb272892 | 263 | |
6c95b8df | 264 | return objfile; |
c906108c SS |
265 | } |
266 | ||
5e2b427d UW |
267 | /* Retrieve the gdbarch associated with OBJFILE. */ |
268 | struct gdbarch * | |
269 | get_objfile_arch (struct objfile *objfile) | |
270 | { | |
271 | return objfile->gdbarch; | |
272 | } | |
273 | ||
0df8b418 | 274 | /* Initialize entry point information for this objfile. */ |
9ab9195f EZ |
275 | |
276 | void | |
277 | init_entry_point_info (struct objfile *objfile) | |
278 | { | |
279 | /* Save startup file's range of PC addresses to help blockframe.c | |
280 | decide where the bottom of the stack is. */ | |
281 | ||
282 | if (bfd_get_file_flags (objfile->obfd) & EXEC_P) | |
283 | { | |
284 | /* Executable file -- record its entry point so we'll recognize | |
285 | the startup file because it contains the entry point. */ | |
286 | objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); | |
abd0a5fa | 287 | objfile->ei.entry_point_p = 1; |
9ab9195f | 288 | } |
574dffa2 DJ |
289 | else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC |
290 | && bfd_get_start_address (objfile->obfd) != 0) | |
abd0a5fa JK |
291 | { |
292 | /* Some shared libraries may have entry points set and be | |
293 | runnable. There's no clear way to indicate this, so just check | |
294 | for values other than zero. */ | |
295 | objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); | |
296 | objfile->ei.entry_point_p = 1; | |
297 | } | |
9ab9195f EZ |
298 | else |
299 | { | |
300 | /* Examination of non-executable.o files. Short-circuit this stuff. */ | |
abd0a5fa | 301 | objfile->ei.entry_point_p = 0; |
9ab9195f | 302 | } |
9ab9195f EZ |
303 | } |
304 | ||
abd0a5fa JK |
305 | /* If there is a valid and known entry point, function fills *ENTRY_P with it |
306 | and returns non-zero; otherwise it returns zero. */ | |
9ab9195f | 307 | |
abd0a5fa JK |
308 | int |
309 | entry_point_address_query (CORE_ADDR *entry_p) | |
9ab9195f | 310 | { |
3612b192 DJ |
311 | struct gdbarch *gdbarch; |
312 | CORE_ADDR entry_point; | |
313 | ||
abd0a5fa | 314 | if (symfile_objfile == NULL || !symfile_objfile->ei.entry_point_p) |
3612b192 DJ |
315 | return 0; |
316 | ||
317 | gdbarch = get_objfile_arch (symfile_objfile); | |
318 | ||
319 | entry_point = symfile_objfile->ei.entry_point; | |
320 | ||
321 | /* Make certain that the address points at real code, and not a | |
322 | function descriptor. */ | |
323 | entry_point = gdbarch_convert_from_func_ptr_addr (gdbarch, entry_point, | |
324 | ¤t_target); | |
325 | ||
326 | /* Remove any ISA markers, so that this matches entries in the | |
327 | symbol table. */ | |
328 | entry_point = gdbarch_addr_bits_remove (gdbarch, entry_point); | |
329 | ||
abd0a5fa JK |
330 | *entry_p = entry_point; |
331 | return 1; | |
332 | } | |
333 | ||
334 | /* Get current entry point address. Call error if it is not known. */ | |
335 | ||
336 | CORE_ADDR | |
337 | entry_point_address (void) | |
338 | { | |
339 | CORE_ADDR retval; | |
340 | ||
341 | if (!entry_point_address_query (&retval)) | |
342 | error (_("Entry point address is not known.")); | |
343 | ||
344 | return retval; | |
9ab9195f | 345 | } |
15831452 JB |
346 | |
347 | /* Create the terminating entry of OBJFILE's minimal symbol table. | |
348 | If OBJFILE->msymbols is zero, allocate a single entry from | |
4a146b47 | 349 | OBJFILE->objfile_obstack; otherwise, just initialize |
15831452 JB |
350 | OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */ |
351 | void | |
352 | terminate_minimal_symbol_table (struct objfile *objfile) | |
353 | { | |
354 | if (! objfile->msymbols) | |
355 | objfile->msymbols = ((struct minimal_symbol *) | |
4a146b47 | 356 | obstack_alloc (&objfile->objfile_obstack, |
15831452 JB |
357 | sizeof (objfile->msymbols[0]))); |
358 | ||
359 | { | |
360 | struct minimal_symbol *m | |
361 | = &objfile->msymbols[objfile->minimal_symbol_count]; | |
362 | ||
363 | memset (m, 0, sizeof (*m)); | |
5bf0017e EZ |
364 | /* Don't rely on these enumeration values being 0's. */ |
365 | MSYMBOL_TYPE (m) = mst_unknown; | |
33e5013e | 366 | SYMBOL_SET_LANGUAGE (m, language_unknown); |
15831452 JB |
367 | } |
368 | } | |
369 | ||
15d123c9 TG |
370 | /* Iterator on PARENT and every separate debug objfile of PARENT. |
371 | The usage pattern is: | |
372 | for (objfile = parent; | |
373 | objfile; | |
374 | objfile = objfile_separate_debug_iterate (parent, objfile)) | |
375 | ... | |
376 | */ | |
377 | ||
378 | struct objfile * | |
379 | objfile_separate_debug_iterate (const struct objfile *parent, | |
380 | const struct objfile *objfile) | |
381 | { | |
382 | struct objfile *res; | |
383 | ||
399f313b | 384 | /* If any, return the first child. */ |
15d123c9 TG |
385 | res = objfile->separate_debug_objfile; |
386 | if (res) | |
387 | return res; | |
388 | ||
15d123c9 TG |
389 | /* Common case where there is no separate debug objfile. */ |
390 | if (objfile == parent) | |
391 | return NULL; | |
392 | ||
399f313b TG |
393 | /* Return the brother if any. Note that we don't iterate on brothers of |
394 | the parents. */ | |
395 | res = objfile->separate_debug_objfile_link; | |
396 | if (res) | |
397 | return res; | |
398 | ||
15d123c9 TG |
399 | for (res = objfile->separate_debug_objfile_backlink; |
400 | res != parent; | |
401 | res = res->separate_debug_objfile_backlink) | |
402 | { | |
403 | gdb_assert (res != NULL); | |
404 | if (res->separate_debug_objfile_link) | |
405 | return res->separate_debug_objfile_link; | |
406 | } | |
407 | return NULL; | |
408 | } | |
15831452 | 409 | |
5b5d99cf JB |
410 | /* Put one object file before a specified on in the global list. |
411 | This can be used to make sure an object file is destroyed before | |
0df8b418 | 412 | another when using ALL_OBJFILES_SAFE to free all objfiles. */ |
5b5d99cf JB |
413 | void |
414 | put_objfile_before (struct objfile *objfile, struct objfile *before_this) | |
415 | { | |
416 | struct objfile **objp; | |
417 | ||
418 | unlink_objfile (objfile); | |
419 | ||
420 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
421 | { | |
422 | if (*objp == before_this) | |
423 | { | |
424 | objfile->next = *objp; | |
425 | *objp = objfile; | |
426 | return; | |
427 | } | |
428 | } | |
429 | ||
430 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 431 | _("put_objfile_before: before objfile not in list")); |
5b5d99cf JB |
432 | } |
433 | ||
c906108c SS |
434 | /* Put OBJFILE at the front of the list. */ |
435 | ||
436 | void | |
fba45db2 | 437 | objfile_to_front (struct objfile *objfile) |
c906108c SS |
438 | { |
439 | struct objfile **objp; | |
440 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
441 | { | |
442 | if (*objp == objfile) | |
443 | { | |
444 | /* Unhook it from where it is. */ | |
445 | *objp = objfile->next; | |
446 | /* Put it in the front. */ | |
447 | objfile->next = object_files; | |
448 | object_files = objfile; | |
449 | break; | |
450 | } | |
451 | } | |
452 | } | |
453 | ||
454 | /* Unlink OBJFILE from the list of known objfiles, if it is found in the | |
455 | list. | |
456 | ||
457 | It is not a bug, or error, to call this function if OBJFILE is not known | |
458 | to be in the current list. This is done in the case of mapped objfiles, | |
459 | for example, just to ensure that the mapped objfile doesn't appear twice | |
460 | in the list. Since the list is threaded, linking in a mapped objfile | |
461 | twice would create a circular list. | |
462 | ||
463 | If OBJFILE turns out to be in the list, we zap it's NEXT pointer after | |
464 | unlinking it, just to ensure that we have completely severed any linkages | |
0df8b418 | 465 | between the OBJFILE and the list. */ |
c906108c SS |
466 | |
467 | void | |
fba45db2 | 468 | unlink_objfile (struct objfile *objfile) |
c906108c | 469 | { |
c5aa993b | 470 | struct objfile **objpp; |
c906108c | 471 | |
c5aa993b | 472 | for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next)) |
c906108c | 473 | { |
c5aa993b | 474 | if (*objpp == objfile) |
c906108c | 475 | { |
c5aa993b JM |
476 | *objpp = (*objpp)->next; |
477 | objfile->next = NULL; | |
07cd4b97 | 478 | return; |
c906108c SS |
479 | } |
480 | } | |
07cd4b97 | 481 | |
8e65ff28 | 482 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 483 | _("unlink_objfile: objfile already unlinked")); |
c906108c SS |
484 | } |
485 | ||
15d123c9 TG |
486 | /* Add OBJFILE as a separate debug objfile of PARENT. */ |
487 | ||
488 | void | |
489 | add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent) | |
490 | { | |
491 | gdb_assert (objfile && parent); | |
492 | ||
493 | /* Must not be already in a list. */ | |
494 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
495 | gdb_assert (objfile->separate_debug_objfile_link == NULL); | |
496 | ||
497 | objfile->separate_debug_objfile_backlink = parent; | |
498 | objfile->separate_debug_objfile_link = parent->separate_debug_objfile; | |
499 | parent->separate_debug_objfile = objfile; | |
500 | ||
501 | /* Put the separate debug object before the normal one, this is so that | |
0df8b418 | 502 | usage of the ALL_OBJFILES_SAFE macro will stay safe. */ |
15d123c9 TG |
503 | put_objfile_before (objfile, parent); |
504 | } | |
505 | ||
506 | /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE | |
507 | itself. */ | |
508 | ||
509 | void | |
510 | free_objfile_separate_debug (struct objfile *objfile) | |
511 | { | |
512 | struct objfile *child; | |
513 | ||
514 | for (child = objfile->separate_debug_objfile; child;) | |
515 | { | |
516 | struct objfile *next_child = child->separate_debug_objfile_link; | |
517 | free_objfile (child); | |
518 | child = next_child; | |
519 | } | |
520 | } | |
c906108c SS |
521 | |
522 | /* Destroy an objfile and all the symtabs and psymtabs under it. Note | |
4a146b47 EZ |
523 | that as much as possible is allocated on the objfile_obstack |
524 | so that the memory can be efficiently freed. | |
c906108c SS |
525 | |
526 | Things which we do NOT free because they are not in malloc'd memory | |
527 | or not in memory specific to the objfile include: | |
528 | ||
c5aa993b | 529 | objfile -> sf |
c906108c SS |
530 | |
531 | FIXME: If the objfile is using reusable symbol information (via mmalloc), | |
532 | then we need to take into account the fact that more than one process | |
533 | may be using the symbol information at the same time (when mmalloc is | |
534 | extended to support cooperative locking). When more than one process | |
535 | is using the mapped symbol info, we need to be more careful about when | |
0df8b418 | 536 | we free objects in the reusable area. */ |
c906108c SS |
537 | |
538 | void | |
fba45db2 | 539 | free_objfile (struct objfile *objfile) |
c906108c | 540 | { |
15d123c9 TG |
541 | /* Free all separate debug objfiles. */ |
542 | free_objfile_separate_debug (objfile); | |
543 | ||
5b5d99cf JB |
544 | if (objfile->separate_debug_objfile_backlink) |
545 | { | |
546 | /* We freed the separate debug file, make sure the base objfile | |
547 | doesn't reference it. */ | |
15d123c9 TG |
548 | struct objfile *child; |
549 | ||
550 | child = objfile->separate_debug_objfile_backlink->separate_debug_objfile; | |
551 | ||
552 | if (child == objfile) | |
553 | { | |
554 | /* OBJFILE is the first child. */ | |
555 | objfile->separate_debug_objfile_backlink->separate_debug_objfile = | |
556 | objfile->separate_debug_objfile_link; | |
557 | } | |
558 | else | |
559 | { | |
560 | /* Find OBJFILE in the list. */ | |
561 | while (1) | |
562 | { | |
563 | if (child->separate_debug_objfile_link == objfile) | |
564 | { | |
565 | child->separate_debug_objfile_link = | |
566 | objfile->separate_debug_objfile_link; | |
567 | break; | |
568 | } | |
569 | child = child->separate_debug_objfile_link; | |
570 | gdb_assert (child); | |
571 | } | |
572 | } | |
5b5d99cf JB |
573 | } |
574 | ||
ae5a43e0 DJ |
575 | /* Remove any references to this objfile in the global value |
576 | lists. */ | |
577 | preserve_values (objfile); | |
578 | ||
9f743ef6 JK |
579 | /* It still may reference data modules have associated with the objfile and |
580 | the symbol file data. */ | |
581 | forget_cached_source_info_for_objfile (objfile); | |
582 | ||
c906108c SS |
583 | /* First do any symbol file specific actions required when we are |
584 | finished with a particular symbol file. Note that if the objfile | |
585 | is using reusable symbol information (via mmalloc) then each of | |
586 | these routines is responsible for doing the correct thing, either | |
587 | freeing things which are valid only during this particular gdb | |
0df8b418 | 588 | execution, or leaving them to be reused during the next one. */ |
c906108c | 589 | |
c5aa993b | 590 | if (objfile->sf != NULL) |
c906108c | 591 | { |
c5aa993b | 592 | (*objfile->sf->sym_finish) (objfile); |
c906108c SS |
593 | } |
594 | ||
9f743ef6 JK |
595 | /* Discard any data modules have associated with the objfile. The function |
596 | still may reference objfile->obfd. */ | |
c5bc3a77 DJ |
597 | objfile_free_data (objfile); |
598 | ||
e3c69974 | 599 | gdb_bfd_unref (objfile->obfd); |
c906108c | 600 | |
0df8b418 | 601 | /* Remove it from the chain of all objfiles. */ |
c906108c SS |
602 | |
603 | unlink_objfile (objfile); | |
604 | ||
adb7f338 JK |
605 | if (objfile == symfile_objfile) |
606 | symfile_objfile = NULL; | |
c906108c SS |
607 | |
608 | if (objfile == rt_common_objfile) | |
609 | rt_common_objfile = NULL; | |
610 | ||
611 | /* Before the symbol table code was redone to make it easier to | |
612 | selectively load and remove information particular to a specific | |
613 | linkage unit, gdb used to do these things whenever the monolithic | |
614 | symbol table was blown away. How much still needs to be done | |
615 | is unknown, but we play it safe for now and keep each action until | |
0df8b418 | 616 | it is shown to be no longer needed. */ |
c5aa993b | 617 | |
cb5d864f FF |
618 | /* Not all our callers call clear_symtab_users (objfile_purge_solibs, |
619 | for example), so we need to call this here. */ | |
c906108c SS |
620 | clear_pc_function_cache (); |
621 | ||
9bdcbae7 DJ |
622 | /* Clear globals which might have pointed into a removed objfile. |
623 | FIXME: It's not clear which of these are supposed to persist | |
624 | between expressions and which ought to be reset each time. */ | |
625 | expression_context_block = NULL; | |
626 | innermost_block = NULL; | |
627 | ||
cb5d864f | 628 | /* Check to see if the current_source_symtab belongs to this objfile, |
0df8b418 | 629 | and if so, call clear_current_source_symtab_and_line. */ |
cb5d864f FF |
630 | |
631 | { | |
632 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
cb5d864f | 633 | |
00174a86 TT |
634 | if (cursal.symtab && cursal.symtab->objfile == objfile) |
635 | clear_current_source_symtab_and_line (); | |
cb5d864f FF |
636 | } |
637 | ||
0df8b418 | 638 | /* The last thing we do is free the objfile struct itself. */ |
c906108c | 639 | |
d31d2fc3 | 640 | xfree (objfile->name); |
78a4a9b9 | 641 | if (objfile->global_psymbols.list) |
2dc74dc1 | 642 | xfree (objfile->global_psymbols.list); |
78a4a9b9 | 643 | if (objfile->static_psymbols.list) |
2dc74dc1 | 644 | xfree (objfile->static_psymbols.list); |
0df8b418 | 645 | /* Free the obstacks for non-reusable objfiles. */ |
710e1a31 | 646 | psymbol_bcache_free (objfile->psymbol_cache); |
78a4a9b9 | 647 | bcache_xfree (objfile->macro_cache); |
10abe6bf | 648 | bcache_xfree (objfile->filename_cache); |
78a4a9b9 AC |
649 | if (objfile->demangled_names_hash) |
650 | htab_delete (objfile->demangled_names_hash); | |
b99607ea | 651 | obstack_free (&objfile->objfile_obstack, 0); |
6c95b8df PA |
652 | |
653 | /* Rebuild section map next time we need it. */ | |
654 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; | |
655 | ||
2dc74dc1 | 656 | xfree (objfile); |
c906108c SS |
657 | } |
658 | ||
74b7792f AC |
659 | static void |
660 | do_free_objfile_cleanup (void *obj) | |
661 | { | |
662 | free_objfile (obj); | |
663 | } | |
664 | ||
665 | struct cleanup * | |
666 | make_cleanup_free_objfile (struct objfile *obj) | |
667 | { | |
668 | return make_cleanup (do_free_objfile_cleanup, obj); | |
669 | } | |
c906108c SS |
670 | |
671 | /* Free all the object files at once and clean up their users. */ | |
672 | ||
673 | void | |
fba45db2 | 674 | free_all_objfiles (void) |
c906108c SS |
675 | { |
676 | struct objfile *objfile, *temp; | |
0133421a JK |
677 | struct so_list *so; |
678 | ||
679 | /* Any objfile referencewould become stale. */ | |
680 | for (so = master_so_list (); so; so = so->next) | |
681 | gdb_assert (so->objfile == NULL); | |
c906108c SS |
682 | |
683 | ALL_OBJFILES_SAFE (objfile, temp) | |
c5aa993b JM |
684 | { |
685 | free_objfile (objfile); | |
686 | } | |
c1e56572 | 687 | clear_symtab_users (0); |
c906108c SS |
688 | } |
689 | \f | |
34eaf542 TT |
690 | /* A helper function for objfile_relocate1 that relocates a single |
691 | symbol. */ | |
692 | ||
693 | static void | |
694 | relocate_one_symbol (struct symbol *sym, struct objfile *objfile, | |
695 | struct section_offsets *delta) | |
696 | { | |
697 | fixup_symbol_section (sym, objfile); | |
698 | ||
699 | /* The RS6000 code from which this was taken skipped | |
700 | any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN. | |
701 | But I'm leaving out that test, on the theory that | |
702 | they can't possibly pass the tests below. */ | |
703 | if ((SYMBOL_CLASS (sym) == LOC_LABEL | |
704 | || SYMBOL_CLASS (sym) == LOC_STATIC) | |
705 | && SYMBOL_SECTION (sym) >= 0) | |
706 | { | |
707 | SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym)); | |
708 | } | |
709 | } | |
710 | ||
c906108c | 711 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS |
b260e109 JK |
712 | entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here. |
713 | Return non-zero iff any change happened. */ | |
567995e1 | 714 | |
b260e109 | 715 | static int |
5cc80db3 MS |
716 | objfile_relocate1 (struct objfile *objfile, |
717 | struct section_offsets *new_offsets) | |
c906108c | 718 | { |
30510692 | 719 | struct obj_section *s; |
d4f3574e | 720 | struct section_offsets *delta = |
a39a16c4 MM |
721 | ((struct section_offsets *) |
722 | alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections))); | |
c906108c | 723 | |
5cc80db3 MS |
724 | int i; |
725 | int something_changed = 0; | |
726 | ||
727 | for (i = 0; i < objfile->num_sections; ++i) | |
728 | { | |
729 | delta->offsets[i] = | |
730 | ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i); | |
731 | if (ANOFFSET (delta, i) != 0) | |
732 | something_changed = 1; | |
733 | } | |
734 | if (!something_changed) | |
735 | return 0; | |
c906108c SS |
736 | |
737 | /* OK, get all the symtabs. */ | |
738 | { | |
739 | struct symtab *s; | |
740 | ||
741 | ALL_OBJFILE_SYMTABS (objfile, s) | |
c5aa993b JM |
742 | { |
743 | struct linetable *l; | |
744 | struct blockvector *bv; | |
745 | int i; | |
746 | ||
747 | /* First the line table. */ | |
748 | l = LINETABLE (s); | |
749 | if (l) | |
750 | { | |
751 | for (i = 0; i < l->nitems; ++i) | |
752 | l->item[i].pc += ANOFFSET (delta, s->block_line_section); | |
753 | } | |
c906108c | 754 | |
c5aa993b JM |
755 | /* Don't relocate a shared blockvector more than once. */ |
756 | if (!s->primary) | |
757 | continue; | |
c906108c | 758 | |
c5aa993b | 759 | bv = BLOCKVECTOR (s); |
b101f7a1 UW |
760 | if (BLOCKVECTOR_MAP (bv)) |
761 | addrmap_relocate (BLOCKVECTOR_MAP (bv), | |
762 | ANOFFSET (delta, s->block_line_section)); | |
763 | ||
c5aa993b JM |
764 | for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i) |
765 | { | |
766 | struct block *b; | |
e88c90f2 | 767 | struct symbol *sym; |
de4f826b | 768 | struct dict_iterator iter; |
c5aa993b JM |
769 | |
770 | b = BLOCKVECTOR_BLOCK (bv, i); | |
771 | BLOCK_START (b) += ANOFFSET (delta, s->block_line_section); | |
772 | BLOCK_END (b) += ANOFFSET (delta, s->block_line_section); | |
773 | ||
de4f826b | 774 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
c5aa993b | 775 | { |
34eaf542 | 776 | relocate_one_symbol (sym, objfile, delta); |
c5aa993b JM |
777 | } |
778 | } | |
779 | } | |
c906108c SS |
780 | } |
781 | ||
34eaf542 TT |
782 | /* Relocate isolated symbols. */ |
783 | { | |
784 | struct symbol *iter; | |
785 | ||
786 | for (iter = objfile->template_symbols; iter; iter = iter->hash_next) | |
787 | relocate_one_symbol (iter, objfile, delta); | |
788 | } | |
789 | ||
9b14d7aa JK |
790 | if (objfile->psymtabs_addrmap) |
791 | addrmap_relocate (objfile->psymtabs_addrmap, | |
792 | ANOFFSET (delta, SECT_OFF_TEXT (objfile))); | |
793 | ||
ccefe4c4 TT |
794 | if (objfile->sf) |
795 | objfile->sf->qf->relocate (objfile, new_offsets, delta); | |
c906108c SS |
796 | |
797 | { | |
798 | struct minimal_symbol *msym; | |
5cc80db3 | 799 | |
c906108c SS |
800 | ALL_OBJFILE_MSYMBOLS (objfile, msym) |
801 | if (SYMBOL_SECTION (msym) >= 0) | |
c5aa993b | 802 | SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym)); |
c906108c SS |
803 | } |
804 | /* Relocating different sections by different amounts may cause the symbols | |
805 | to be out of order. */ | |
806 | msymbols_sort (objfile); | |
807 | ||
abd0a5fa | 808 | if (objfile->ei.entry_point_p) |
36b0c0e0 PS |
809 | { |
810 | /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT | |
811 | only as a fallback. */ | |
812 | struct obj_section *s; | |
813 | s = find_pc_section (objfile->ei.entry_point); | |
814 | if (s) | |
815 | objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index); | |
816 | else | |
817 | objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); | |
818 | } | |
819 | ||
f1f2b5f4 PA |
820 | { |
821 | int i; | |
5cc80db3 | 822 | |
f1f2b5f4 PA |
823 | for (i = 0; i < objfile->num_sections; ++i) |
824 | (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i); | |
825 | } | |
826 | ||
827 | /* Rebuild section map next time we need it. */ | |
6c95b8df | 828 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; |
f1f2b5f4 | 829 | |
30510692 DJ |
830 | /* Update the table in exec_ops, used to read memory. */ |
831 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
832 | { | |
833 | int idx = s->the_bfd_section->index; | |
834 | ||
835 | exec_set_section_address (bfd_get_filename (objfile->obfd), idx, | |
f1f6aadf | 836 | obj_section_addr (s)); |
30510692 | 837 | } |
b260e109 JK |
838 | |
839 | /* Data changed. */ | |
840 | return 1; | |
567995e1 JK |
841 | } |
842 | ||
843 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS | |
844 | entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs. | |
845 | ||
846 | The number and ordering of sections does differ between the two objfiles. | |
847 | Only their names match. Also the file offsets will differ (objfile being | |
848 | possibly prelinked but separate_debug_objfile is probably not prelinked) but | |
849 | the in-memory absolute address as specified by NEW_OFFSETS must match both | |
850 | files. */ | |
851 | ||
852 | void | |
853 | objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets) | |
854 | { | |
855 | struct objfile *debug_objfile; | |
b260e109 | 856 | int changed = 0; |
567995e1 | 857 | |
b260e109 | 858 | changed |= objfile_relocate1 (objfile, new_offsets); |
567995e1 JK |
859 | |
860 | for (debug_objfile = objfile->separate_debug_objfile; | |
861 | debug_objfile; | |
862 | debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile)) | |
863 | { | |
864 | struct section_addr_info *objfile_addrs; | |
865 | struct section_offsets *new_debug_offsets; | |
567995e1 JK |
866 | struct cleanup *my_cleanups; |
867 | ||
868 | objfile_addrs = build_section_addr_info_from_objfile (objfile); | |
869 | my_cleanups = make_cleanup (xfree, objfile_addrs); | |
870 | ||
871 | /* Here OBJFILE_ADDRS contain the correct absolute addresses, the | |
872 | relative ones must be already created according to debug_objfile. */ | |
873 | ||
874 | addr_info_make_relative (objfile_addrs, debug_objfile->obfd); | |
875 | ||
876 | gdb_assert (debug_objfile->num_sections | |
877 | == bfd_count_sections (debug_objfile->obfd)); | |
4fc06681 MS |
878 | new_debug_offsets = |
879 | xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections)); | |
567995e1 JK |
880 | make_cleanup (xfree, new_debug_offsets); |
881 | relative_addr_info_to_section_offsets (new_debug_offsets, | |
882 | debug_objfile->num_sections, | |
883 | objfile_addrs); | |
884 | ||
b260e109 | 885 | changed |= objfile_relocate1 (debug_objfile, new_debug_offsets); |
567995e1 JK |
886 | |
887 | do_cleanups (my_cleanups); | |
888 | } | |
30510692 | 889 | |
0df8b418 | 890 | /* Relocate breakpoints as necessary, after things are relocated. */ |
b260e109 JK |
891 | if (changed) |
892 | breakpoint_re_set (); | |
c906108c SS |
893 | } |
894 | \f | |
55333a84 DE |
895 | /* Return non-zero if OBJFILE has partial symbols. */ |
896 | ||
897 | int | |
898 | objfile_has_partial_symbols (struct objfile *objfile) | |
899 | { | |
b11896a5 TT |
900 | if (!objfile->sf) |
901 | return 0; | |
3e03848b JK |
902 | |
903 | /* If we have not read psymbols, but we have a function capable of reading | |
904 | them, then that is an indication that they are in fact available. Without | |
905 | this function the symbols may have been already read in but they also may | |
906 | not be present in this objfile. */ | |
907 | if ((objfile->flags & OBJF_PSYMTABS_READ) == 0 | |
908 | && objfile->sf->sym_read_psymbols != NULL) | |
909 | return 1; | |
910 | ||
b11896a5 | 911 | return objfile->sf->qf->has_symbols (objfile); |
55333a84 DE |
912 | } |
913 | ||
914 | /* Return non-zero if OBJFILE has full symbols. */ | |
915 | ||
916 | int | |
917 | objfile_has_full_symbols (struct objfile *objfile) | |
918 | { | |
919 | return objfile->symtabs != NULL; | |
920 | } | |
921 | ||
e361b228 | 922 | /* Return non-zero if OBJFILE has full or partial symbols, either directly |
15d123c9 | 923 | or through a separate debug file. */ |
e361b228 TG |
924 | |
925 | int | |
926 | objfile_has_symbols (struct objfile *objfile) | |
927 | { | |
15d123c9 | 928 | struct objfile *o; |
e361b228 | 929 | |
15d123c9 TG |
930 | for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o)) |
931 | if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o)) | |
932 | return 1; | |
e361b228 TG |
933 | return 0; |
934 | } | |
935 | ||
936 | ||
c906108c SS |
937 | /* Many places in gdb want to test just to see if we have any partial |
938 | symbols available. This function returns zero if none are currently | |
0df8b418 | 939 | available, nonzero otherwise. */ |
c906108c SS |
940 | |
941 | int | |
fba45db2 | 942 | have_partial_symbols (void) |
c906108c SS |
943 | { |
944 | struct objfile *ofp; | |
945 | ||
946 | ALL_OBJFILES (ofp) | |
c5aa993b | 947 | { |
55333a84 DE |
948 | if (objfile_has_partial_symbols (ofp)) |
949 | return 1; | |
c5aa993b | 950 | } |
c906108c SS |
951 | return 0; |
952 | } | |
953 | ||
954 | /* Many places in gdb want to test just to see if we have any full | |
955 | symbols available. This function returns zero if none are currently | |
0df8b418 | 956 | available, nonzero otherwise. */ |
c906108c SS |
957 | |
958 | int | |
fba45db2 | 959 | have_full_symbols (void) |
c906108c SS |
960 | { |
961 | struct objfile *ofp; | |
962 | ||
963 | ALL_OBJFILES (ofp) | |
c5aa993b | 964 | { |
55333a84 DE |
965 | if (objfile_has_full_symbols (ofp)) |
966 | return 1; | |
c5aa993b | 967 | } |
c906108c SS |
968 | return 0; |
969 | } | |
970 | ||
971 | ||
972 | /* This operations deletes all objfile entries that represent solibs that | |
973 | weren't explicitly loaded by the user, via e.g., the add-symbol-file | |
0df8b418 MS |
974 | command. */ |
975 | ||
c906108c | 976 | void |
fba45db2 | 977 | objfile_purge_solibs (void) |
c906108c | 978 | { |
c5aa993b JM |
979 | struct objfile *objf; |
980 | struct objfile *temp; | |
c906108c SS |
981 | |
982 | ALL_OBJFILES_SAFE (objf, temp) | |
983 | { | |
984 | /* We assume that the solib package has been purged already, or will | |
0df8b418 MS |
985 | be soon. */ |
986 | ||
2df3850c | 987 | if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED)) |
c906108c SS |
988 | free_objfile (objf); |
989 | } | |
990 | } | |
991 | ||
992 | ||
993 | /* Many places in gdb want to test just to see if we have any minimal | |
994 | symbols available. This function returns zero if none are currently | |
0df8b418 | 995 | available, nonzero otherwise. */ |
c906108c SS |
996 | |
997 | int | |
fba45db2 | 998 | have_minimal_symbols (void) |
c906108c SS |
999 | { |
1000 | struct objfile *ofp; | |
1001 | ||
1002 | ALL_OBJFILES (ofp) | |
c5aa993b | 1003 | { |
15831452 | 1004 | if (ofp->minimal_symbol_count > 0) |
c5aa993b JM |
1005 | { |
1006 | return 1; | |
1007 | } | |
1008 | } | |
c906108c SS |
1009 | return 0; |
1010 | } | |
1011 | ||
a845f5cb PP |
1012 | /* Qsort comparison function. */ |
1013 | ||
1014 | static int | |
1015 | qsort_cmp (const void *a, const void *b) | |
1016 | { | |
1017 | const struct obj_section *sect1 = *(const struct obj_section **) a; | |
1018 | const struct obj_section *sect2 = *(const struct obj_section **) b; | |
1019 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1020 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1021 | ||
1022 | if (sect1_addr < sect2_addr) | |
6fbf07cd | 1023 | return -1; |
a845f5cb | 1024 | else if (sect1_addr > sect2_addr) |
6fbf07cd PP |
1025 | return 1; |
1026 | else | |
5cc80db3 MS |
1027 | { |
1028 | /* Sections are at the same address. This could happen if | |
1029 | A) we have an objfile and a separate debuginfo. | |
1030 | B) we are confused, and have added sections without proper relocation, | |
0df8b418 | 1031 | or something like that. */ |
5cc80db3 MS |
1032 | |
1033 | const struct objfile *const objfile1 = sect1->objfile; | |
1034 | const struct objfile *const objfile2 = sect2->objfile; | |
1035 | ||
1036 | if (objfile1->separate_debug_objfile == objfile2 | |
1037 | || objfile2->separate_debug_objfile == objfile1) | |
1038 | { | |
1039 | /* Case A. The ordering doesn't matter: separate debuginfo files | |
1040 | will be filtered out later. */ | |
1041 | ||
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | /* Case B. Maintain stable sort order, so bugs in GDB are easier to | |
1046 | triage. This section could be slow (since we iterate over all | |
1047 | objfiles in each call to qsort_cmp), but this shouldn't happen | |
1048 | very often (GDB is already in a confused state; one hopes this | |
1049 | doesn't happen at all). If you discover that significant time is | |
1050 | spent in the loops below, do 'set complaints 100' and examine the | |
1051 | resulting complaints. */ | |
1052 | ||
1053 | if (objfile1 == objfile2) | |
1054 | { | |
1055 | /* Both sections came from the same objfile. We are really confused. | |
1056 | Sort on sequence order of sections within the objfile. */ | |
1057 | ||
1058 | const struct obj_section *osect; | |
1059 | ||
1060 | ALL_OBJFILE_OSECTIONS (objfile1, osect) | |
1061 | if (osect == sect1) | |
1062 | return -1; | |
1063 | else if (osect == sect2) | |
1064 | return 1; | |
1065 | ||
1066 | /* We should have found one of the sections before getting here. */ | |
f3574227 | 1067 | gdb_assert_not_reached ("section not found"); |
5cc80db3 MS |
1068 | } |
1069 | else | |
1070 | { | |
1071 | /* Sort on sequence number of the objfile in the chain. */ | |
1072 | ||
1073 | const struct objfile *objfile; | |
1074 | ||
1075 | ALL_OBJFILES (objfile) | |
1076 | if (objfile == objfile1) | |
1077 | return -1; | |
1078 | else if (objfile == objfile2) | |
1079 | return 1; | |
1080 | ||
1081 | /* We should have found one of the objfiles before getting here. */ | |
f3574227 | 1082 | gdb_assert_not_reached ("objfile not found"); |
5cc80db3 MS |
1083 | } |
1084 | } | |
6fbf07cd PP |
1085 | |
1086 | /* Unreachable. */ | |
f3574227 | 1087 | gdb_assert_not_reached ("unexpected code path"); |
a845f5cb PP |
1088 | return 0; |
1089 | } | |
1090 | ||
3aad21cf PP |
1091 | /* Select "better" obj_section to keep. We prefer the one that came from |
1092 | the real object, rather than the one from separate debuginfo. | |
1093 | Most of the time the two sections are exactly identical, but with | |
1094 | prelinking the .rel.dyn section in the real object may have different | |
1095 | size. */ | |
1096 | ||
1097 | static struct obj_section * | |
1098 | preferred_obj_section (struct obj_section *a, struct obj_section *b) | |
1099 | { | |
1100 | gdb_assert (obj_section_addr (a) == obj_section_addr (b)); | |
1101 | gdb_assert ((a->objfile->separate_debug_objfile == b->objfile) | |
1102 | || (b->objfile->separate_debug_objfile == a->objfile)); | |
1103 | gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile) | |
1104 | || (b->objfile->separate_debug_objfile_backlink == a->objfile)); | |
1105 | ||
1106 | if (a->objfile->separate_debug_objfile != NULL) | |
1107 | return a; | |
1108 | return b; | |
1109 | } | |
1110 | ||
6fbf07cd PP |
1111 | /* Return 1 if SECTION should be inserted into the section map. |
1112 | We want to insert only non-overlay and non-TLS section. */ | |
1113 | ||
1114 | static int | |
1115 | insert_section_p (const struct bfd *abfd, | |
1116 | const struct bfd_section *section) | |
1117 | { | |
1118 | const bfd_vma lma = bfd_section_lma (abfd, section); | |
1119 | ||
1120 | if (lma != 0 && lma != bfd_section_vma (abfd, section) | |
1121 | && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0) | |
1122 | /* This is an overlay section. IN_MEMORY check is needed to avoid | |
1123 | discarding sections from the "system supplied DSO" (aka vdso) | |
1124 | on some Linux systems (e.g. Fedora 11). */ | |
1125 | return 0; | |
1126 | if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0) | |
1127 | /* This is a TLS section. */ | |
1128 | return 0; | |
1129 | ||
1130 | return 1; | |
1131 | } | |
1132 | ||
1133 | /* Filter out overlapping sections where one section came from the real | |
1134 | objfile, and the other from a separate debuginfo file. | |
1135 | Return the size of table after redundant sections have been eliminated. */ | |
1136 | ||
1137 | static int | |
1138 | filter_debuginfo_sections (struct obj_section **map, int map_size) | |
1139 | { | |
1140 | int i, j; | |
1141 | ||
1142 | for (i = 0, j = 0; i < map_size - 1; i++) | |
1143 | { | |
1144 | struct obj_section *const sect1 = map[i]; | |
1145 | struct obj_section *const sect2 = map[i + 1]; | |
1146 | const struct objfile *const objfile1 = sect1->objfile; | |
1147 | const struct objfile *const objfile2 = sect2->objfile; | |
1148 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1149 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1150 | ||
1151 | if (sect1_addr == sect2_addr | |
1152 | && (objfile1->separate_debug_objfile == objfile2 | |
1153 | || objfile2->separate_debug_objfile == objfile1)) | |
1154 | { | |
1155 | map[j++] = preferred_obj_section (sect1, sect2); | |
1156 | ++i; | |
1157 | } | |
1158 | else | |
1159 | map[j++] = sect1; | |
1160 | } | |
1161 | ||
1162 | if (i < map_size) | |
1163 | { | |
1164 | gdb_assert (i == map_size - 1); | |
1165 | map[j++] = map[i]; | |
1166 | } | |
1167 | ||
1168 | /* The map should not have shrunk to less than half the original size. */ | |
1169 | gdb_assert (map_size / 2 <= j); | |
1170 | ||
1171 | return j; | |
1172 | } | |
1173 | ||
1174 | /* Filter out overlapping sections, issuing a warning if any are found. | |
1175 | Overlapping sections could really be overlay sections which we didn't | |
1176 | classify as such in insert_section_p, or we could be dealing with a | |
1177 | corrupt binary. */ | |
1178 | ||
1179 | static int | |
1180 | filter_overlapping_sections (struct obj_section **map, int map_size) | |
1181 | { | |
1182 | int i, j; | |
1183 | ||
1184 | for (i = 0, j = 0; i < map_size - 1; ) | |
1185 | { | |
1186 | int k; | |
1187 | ||
1188 | map[j++] = map[i]; | |
1189 | for (k = i + 1; k < map_size; k++) | |
1190 | { | |
1191 | struct obj_section *const sect1 = map[i]; | |
1192 | struct obj_section *const sect2 = map[k]; | |
1193 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1194 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1195 | const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1); | |
1196 | ||
1197 | gdb_assert (sect1_addr <= sect2_addr); | |
1198 | ||
1199 | if (sect1_endaddr <= sect2_addr) | |
1200 | break; | |
1201 | else | |
1202 | { | |
1203 | /* We have an overlap. Report it. */ | |
1204 | ||
1205 | struct objfile *const objf1 = sect1->objfile; | |
1206 | struct objfile *const objf2 = sect2->objfile; | |
1207 | ||
1208 | const struct bfd *const abfd1 = objf1->obfd; | |
1209 | const struct bfd *const abfd2 = objf2->obfd; | |
1210 | ||
1211 | const struct bfd_section *const bfds1 = sect1->the_bfd_section; | |
1212 | const struct bfd_section *const bfds2 = sect2->the_bfd_section; | |
1213 | ||
1214 | const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2); | |
1215 | ||
1216 | struct gdbarch *const gdbarch = get_objfile_arch (objf1); | |
1217 | ||
1218 | complaint (&symfile_complaints, | |
1219 | _("unexpected overlap between:\n" | |
1220 | " (A) section `%s' from `%s' [%s, %s)\n" | |
1221 | " (B) section `%s' from `%s' [%s, %s).\n" | |
1222 | "Will ignore section B"), | |
1223 | bfd_section_name (abfd1, bfds1), objf1->name, | |
1224 | paddress (gdbarch, sect1_addr), | |
1225 | paddress (gdbarch, sect1_endaddr), | |
1226 | bfd_section_name (abfd2, bfds2), objf2->name, | |
1227 | paddress (gdbarch, sect2_addr), | |
1228 | paddress (gdbarch, sect2_endaddr)); | |
1229 | } | |
1230 | } | |
1231 | i = k; | |
1232 | } | |
1233 | ||
1234 | if (i < map_size) | |
1235 | { | |
1236 | gdb_assert (i == map_size - 1); | |
1237 | map[j++] = map[i]; | |
1238 | } | |
1239 | ||
1240 | return j; | |
1241 | } | |
1242 | ||
1243 | ||
1244 | /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any | |
1245 | TLS, overlay and overlapping sections. */ | |
a845f5cb PP |
1246 | |
1247 | static void | |
6c95b8df PA |
1248 | update_section_map (struct program_space *pspace, |
1249 | struct obj_section ***pmap, int *pmap_size) | |
a845f5cb | 1250 | { |
6fbf07cd | 1251 | int alloc_size, map_size, i; |
a845f5cb PP |
1252 | struct obj_section *s, **map; |
1253 | struct objfile *objfile; | |
1254 | ||
6c95b8df | 1255 | gdb_assert (get_objfile_pspace_data (pspace)->objfiles_changed_p != 0); |
a845f5cb PP |
1256 | |
1257 | map = *pmap; | |
1258 | xfree (map); | |
1259 | ||
6fbf07cd | 1260 | alloc_size = 0; |
6c95b8df PA |
1261 | ALL_PSPACE_OBJFILES (pspace, objfile) |
1262 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
1263 | if (insert_section_p (objfile->obfd, s->the_bfd_section)) | |
1264 | alloc_size += 1; | |
a845f5cb | 1265 | |
65a97ab3 PP |
1266 | /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */ |
1267 | if (alloc_size == 0) | |
1268 | { | |
1269 | *pmap = NULL; | |
1270 | *pmap_size = 0; | |
1271 | return; | |
1272 | } | |
1273 | ||
6fbf07cd | 1274 | map = xmalloc (alloc_size * sizeof (*map)); |
a845f5cb | 1275 | |
3aad21cf | 1276 | i = 0; |
6c95b8df PA |
1277 | ALL_PSPACE_OBJFILES (pspace, objfile) |
1278 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
1279 | if (insert_section_p (objfile->obfd, s->the_bfd_section)) | |
1280 | map[i++] = s; | |
a845f5cb | 1281 | |
6fbf07cd PP |
1282 | qsort (map, alloc_size, sizeof (*map), qsort_cmp); |
1283 | map_size = filter_debuginfo_sections(map, alloc_size); | |
1284 | map_size = filter_overlapping_sections(map, map_size); | |
a845f5cb | 1285 | |
6fbf07cd PP |
1286 | if (map_size < alloc_size) |
1287 | /* Some sections were eliminated. Trim excess space. */ | |
1288 | map = xrealloc (map, map_size * sizeof (*map)); | |
3aad21cf | 1289 | else |
6fbf07cd | 1290 | gdb_assert (alloc_size == map_size); |
3aad21cf | 1291 | |
a845f5cb PP |
1292 | *pmap = map; |
1293 | *pmap_size = map_size; | |
1294 | } | |
1295 | ||
0df8b418 | 1296 | /* Bsearch comparison function. */ |
a845f5cb PP |
1297 | |
1298 | static int | |
1299 | bsearch_cmp (const void *key, const void *elt) | |
1300 | { | |
1301 | const CORE_ADDR pc = *(CORE_ADDR *) key; | |
1302 | const struct obj_section *section = *(const struct obj_section **) elt; | |
1303 | ||
1304 | if (pc < obj_section_addr (section)) | |
1305 | return -1; | |
1306 | if (pc < obj_section_endaddr (section)) | |
1307 | return 0; | |
1308 | return 1; | |
1309 | } | |
1310 | ||
714835d5 | 1311 | /* Returns a section whose range includes PC or NULL if none found. */ |
c906108c SS |
1312 | |
1313 | struct obj_section * | |
714835d5 | 1314 | find_pc_section (CORE_ADDR pc) |
c906108c | 1315 | { |
6c95b8df | 1316 | struct objfile_pspace_info *pspace_info; |
a845f5cb | 1317 | struct obj_section *s, **sp; |
c5aa993b | 1318 | |
714835d5 UW |
1319 | /* Check for mapped overlay section first. */ |
1320 | s = find_pc_mapped_section (pc); | |
1321 | if (s) | |
1322 | return s; | |
c906108c | 1323 | |
6c95b8df PA |
1324 | pspace_info = get_objfile_pspace_data (current_program_space); |
1325 | if (pspace_info->objfiles_changed_p != 0) | |
a845f5cb | 1326 | { |
6c95b8df PA |
1327 | update_section_map (current_program_space, |
1328 | &pspace_info->sections, | |
1329 | &pspace_info->num_sections); | |
c906108c | 1330 | |
6c95b8df PA |
1331 | /* Don't need updates to section map until objfiles are added, |
1332 | removed or relocated. */ | |
1333 | pspace_info->objfiles_changed_p = 0; | |
a845f5cb PP |
1334 | } |
1335 | ||
65a97ab3 PP |
1336 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1337 | bsearch be non-NULL. */ | |
1338 | if (pspace_info->sections == NULL) | |
1339 | { | |
1340 | gdb_assert (pspace_info->num_sections == 0); | |
1341 | return NULL; | |
1342 | } | |
1343 | ||
6c95b8df PA |
1344 | sp = (struct obj_section **) bsearch (&pc, |
1345 | pspace_info->sections, | |
1346 | pspace_info->num_sections, | |
1347 | sizeof (*pspace_info->sections), | |
1348 | bsearch_cmp); | |
a845f5cb PP |
1349 | if (sp != NULL) |
1350 | return *sp; | |
714835d5 | 1351 | return NULL; |
c906108c | 1352 | } |
c5aa993b | 1353 | |
c906108c SS |
1354 | |
1355 | /* In SVR4, we recognize a trampoline by it's section name. | |
1356 | That is, if the pc is in a section named ".plt" then we are in | |
1357 | a trampoline. */ | |
1358 | ||
1359 | int | |
fba45db2 | 1360 | in_plt_section (CORE_ADDR pc, char *name) |
c906108c SS |
1361 | { |
1362 | struct obj_section *s; | |
1363 | int retval = 0; | |
c5aa993b JM |
1364 | |
1365 | s = find_pc_section (pc); | |
1366 | ||
c906108c SS |
1367 | retval = (s != NULL |
1368 | && s->the_bfd_section->name != NULL | |
6314a349 | 1369 | && strcmp (s->the_bfd_section->name, ".plt") == 0); |
c5aa993b | 1370 | return (retval); |
c906108c | 1371 | } |
0d0e1a63 MK |
1372 | \f |
1373 | ||
1374 | /* Keep a registry of per-objfile data-pointers required by other GDB | |
1375 | modules. */ | |
1376 | ||
1377 | struct objfile_data | |
1378 | { | |
1379 | unsigned index; | |
c1bd65d0 DE |
1380 | void (*save) (struct objfile *, void *); |
1381 | void (*free) (struct objfile *, void *); | |
0d0e1a63 MK |
1382 | }; |
1383 | ||
1384 | struct objfile_data_registration | |
1385 | { | |
1386 | struct objfile_data *data; | |
1387 | struct objfile_data_registration *next; | |
1388 | }; | |
1389 | ||
1390 | struct objfile_data_registry | |
1391 | { | |
1392 | struct objfile_data_registration *registrations; | |
1393 | unsigned num_registrations; | |
1394 | }; | |
1395 | ||
1396 | static struct objfile_data_registry objfile_data_registry = { NULL, 0 }; | |
1397 | ||
1398 | const struct objfile_data * | |
c1bd65d0 DE |
1399 | register_objfile_data_with_cleanup (void (*save) (struct objfile *, void *), |
1400 | void (*free) (struct objfile *, void *)) | |
0d0e1a63 MK |
1401 | { |
1402 | struct objfile_data_registration **curr; | |
1403 | ||
1404 | /* Append new registration. */ | |
1405 | for (curr = &objfile_data_registry.registrations; | |
1406 | *curr != NULL; curr = &(*curr)->next); | |
7be570e7 | 1407 | |
0d0e1a63 MK |
1408 | *curr = XMALLOC (struct objfile_data_registration); |
1409 | (*curr)->next = NULL; | |
1410 | (*curr)->data = XMALLOC (struct objfile_data); | |
1411 | (*curr)->data->index = objfile_data_registry.num_registrations++; | |
c1bd65d0 DE |
1412 | (*curr)->data->save = save; |
1413 | (*curr)->data->free = free; | |
0d0e1a63 MK |
1414 | |
1415 | return (*curr)->data; | |
1416 | } | |
1417 | ||
60c5725c DJ |
1418 | const struct objfile_data * |
1419 | register_objfile_data (void) | |
1420 | { | |
c1bd65d0 | 1421 | return register_objfile_data_with_cleanup (NULL, NULL); |
60c5725c DJ |
1422 | } |
1423 | ||
0d0e1a63 MK |
1424 | static void |
1425 | objfile_alloc_data (struct objfile *objfile) | |
1426 | { | |
1427 | gdb_assert (objfile->data == NULL); | |
1428 | objfile->num_data = objfile_data_registry.num_registrations; | |
1429 | objfile->data = XCALLOC (objfile->num_data, void *); | |
1430 | } | |
1431 | ||
1432 | static void | |
1433 | objfile_free_data (struct objfile *objfile) | |
1434 | { | |
1435 | gdb_assert (objfile->data != NULL); | |
60c5725c | 1436 | clear_objfile_data (objfile); |
0d0e1a63 MK |
1437 | xfree (objfile->data); |
1438 | objfile->data = NULL; | |
1439 | } | |
1440 | ||
7b097ae3 MK |
1441 | void |
1442 | clear_objfile_data (struct objfile *objfile) | |
1443 | { | |
60c5725c DJ |
1444 | struct objfile_data_registration *registration; |
1445 | int i; | |
1446 | ||
7b097ae3 | 1447 | gdb_assert (objfile->data != NULL); |
60c5725c | 1448 | |
c1bd65d0 DE |
1449 | /* Process all the save handlers. */ |
1450 | ||
1451 | for (registration = objfile_data_registry.registrations, i = 0; | |
1452 | i < objfile->num_data; | |
1453 | registration = registration->next, i++) | |
1454 | if (objfile->data[i] != NULL && registration->data->save != NULL) | |
1455 | registration->data->save (objfile, objfile->data[i]); | |
1456 | ||
1457 | /* Now process all the free handlers. */ | |
1458 | ||
60c5725c DJ |
1459 | for (registration = objfile_data_registry.registrations, i = 0; |
1460 | i < objfile->num_data; | |
1461 | registration = registration->next, i++) | |
c1bd65d0 DE |
1462 | if (objfile->data[i] != NULL && registration->data->free != NULL) |
1463 | registration->data->free (objfile, objfile->data[i]); | |
60c5725c | 1464 | |
7b097ae3 MK |
1465 | memset (objfile->data, 0, objfile->num_data * sizeof (void *)); |
1466 | } | |
1467 | ||
0d0e1a63 MK |
1468 | void |
1469 | set_objfile_data (struct objfile *objfile, const struct objfile_data *data, | |
1470 | void *value) | |
1471 | { | |
1472 | gdb_assert (data->index < objfile->num_data); | |
1473 | objfile->data[data->index] = value; | |
1474 | } | |
1475 | ||
1476 | void * | |
1477 | objfile_data (struct objfile *objfile, const struct objfile_data *data) | |
1478 | { | |
1479 | gdb_assert (data->index < objfile->num_data); | |
1480 | return objfile->data[data->index]; | |
1481 | } | |
a845f5cb | 1482 | |
bb272892 PP |
1483 | /* Set objfiles_changed_p so section map will be rebuilt next time it |
1484 | is used. Called by reread_symbols. */ | |
a845f5cb PP |
1485 | |
1486 | void | |
bb272892 | 1487 | objfiles_changed (void) |
a845f5cb | 1488 | { |
6c95b8df PA |
1489 | /* Rebuild section map next time we need it. */ |
1490 | get_objfile_pspace_data (current_program_space)->objfiles_changed_p = 1; | |
a845f5cb | 1491 | } |
e3c69974 | 1492 | |
516ba659 PA |
1493 | /* Close ABFD, and warn if that fails. */ |
1494 | ||
1495 | int | |
1496 | gdb_bfd_close_or_warn (struct bfd *abfd) | |
1497 | { | |
1498 | int ret; | |
1499 | char *name = bfd_get_filename (abfd); | |
1500 | ||
1501 | ret = bfd_close (abfd); | |
1502 | ||
1503 | if (!ret) | |
1504 | warning (_("cannot close \"%s\": %s"), | |
1505 | name, bfd_errmsg (bfd_get_error ())); | |
1506 | ||
1507 | return ret; | |
1508 | } | |
1509 | ||
3db741ef PP |
1510 | /* Add reference to ABFD. Returns ABFD. */ |
1511 | struct bfd * | |
1512 | gdb_bfd_ref (struct bfd *abfd) | |
1513 | { | |
6f451e5e TT |
1514 | int *p_refcount; |
1515 | ||
1516 | if (abfd == NULL) | |
1517 | return NULL; | |
1518 | ||
1519 | p_refcount = bfd_usrdata (abfd); | |
3db741ef PP |
1520 | |
1521 | if (p_refcount != NULL) | |
1522 | { | |
1523 | *p_refcount += 1; | |
1524 | return abfd; | |
1525 | } | |
1526 | ||
1527 | p_refcount = xmalloc (sizeof (*p_refcount)); | |
1528 | *p_refcount = 1; | |
1529 | bfd_usrdata (abfd) = p_refcount; | |
1530 | ||
1531 | return abfd; | |
1532 | } | |
1533 | ||
1534 | /* Unreference and possibly close ABFD. */ | |
e3c69974 PP |
1535 | void |
1536 | gdb_bfd_unref (struct bfd *abfd) | |
1537 | { | |
1538 | int *p_refcount; | |
1539 | char *name; | |
1540 | ||
1541 | if (abfd == NULL) | |
1542 | return; | |
1543 | ||
4f6f9936 | 1544 | p_refcount = bfd_usrdata (abfd); |
e3c69974 | 1545 | |
3db741ef PP |
1546 | /* Valid range for p_refcount: a pointer to int counter, which has a |
1547 | value of 1 (single owner) or 2 (shared). */ | |
1548 | gdb_assert (*p_refcount == 1 || *p_refcount == 2); | |
1549 | ||
1550 | *p_refcount -= 1; | |
1551 | if (*p_refcount > 0) | |
1552 | return; | |
e3c69974 | 1553 | |
e3c69974 | 1554 | xfree (p_refcount); |
4f6f9936 | 1555 | bfd_usrdata (abfd) = NULL; /* Paranoia. */ |
e3c69974 PP |
1556 | |
1557 | name = bfd_get_filename (abfd); | |
516ba659 | 1558 | gdb_bfd_close_or_warn (abfd); |
e3c69974 PP |
1559 | xfree (name); |
1560 | } | |
6c95b8df PA |
1561 | |
1562 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
1563 | extern initialize_file_ftype _initialize_objfiles; | |
1564 | ||
1565 | void | |
1566 | _initialize_objfiles (void) | |
1567 | { | |
1568 | objfiles_pspace_data | |
1569 | = register_program_space_data_with_cleanup (objfiles_pspace_data_cleanup); | |
1570 | } |