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, |
4c38e0a4 | 4 | 2002, 2003, 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
af5f3db6 | 5 | |
c906108c SS |
6 | Contributed by Cygnus Support, using pieces from other GDB modules. |
7 | ||
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 13 | (at your option) any later version. |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b | 20 | You should have received a copy of the GNU General Public License |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
22 | |
23 | /* This file contains support routines for creating, manipulating, and | |
24 | destroying objfile structures. */ | |
25 | ||
26 | #include "defs.h" | |
27 | #include "bfd.h" /* Binary File Description */ | |
28 | #include "symtab.h" | |
29 | #include "symfile.h" | |
30 | #include "objfiles.h" | |
31 | #include "gdb-stabs.h" | |
32 | #include "target.h" | |
af5f3db6 | 33 | #include "bcache.h" |
5b123146 | 34 | #include "mdebugread.h" |
9bdcbae7 DJ |
35 | #include "expression.h" |
36 | #include "parser-defs.h" | |
37 | ||
0d0e1a63 | 38 | #include "gdb_assert.h" |
c906108c SS |
39 | #include <sys/types.h> |
40 | #include "gdb_stat.h" | |
41 | #include <fcntl.h> | |
04ea0df1 | 42 | #include "gdb_obstack.h" |
c906108c | 43 | #include "gdb_string.h" |
2de7ced7 | 44 | #include "hashtab.h" |
c906108c | 45 | |
7a292a7a | 46 | #include "breakpoint.h" |
fe898f56 | 47 | #include "block.h" |
de4f826b | 48 | #include "dictionary.h" |
cb5d864f | 49 | #include "source.h" |
801e3a5b | 50 | #include "addrmap.h" |
5e2b427d | 51 | #include "arch-utils.h" |
30510692 | 52 | #include "exec.h" |
a845f5cb | 53 | #include "observer.h" |
6fbf07cd | 54 | #include "complaints.h" |
7a292a7a | 55 | |
c906108c SS |
56 | /* Prototypes for local functions */ |
57 | ||
0d0e1a63 MK |
58 | static void objfile_alloc_data (struct objfile *objfile); |
59 | static void objfile_free_data (struct objfile *objfile); | |
60 | ||
c906108c SS |
61 | /* Externally visible variables that are owned by this module. |
62 | See declarations in objfile.h for more info. */ | |
63 | ||
c906108c | 64 | struct objfile *current_objfile; /* For symbol file being read in */ |
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 | ||
c906108c SS |
111 | /* Locate all mappable sections of a BFD file. |
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 | |
118 | the end of the table (objfile->sections_end). */ | |
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; | |
8b92e4d5 | 138 | obstack_grow (&objfile->objfile_obstack, (char *) §ion, sizeof (section)); |
f1f6aadf PA |
139 | objfile->sections_end |
140 | = (struct obj_section *) (((size_t) objfile->sections_end) + 1); | |
c906108c SS |
141 | } |
142 | ||
143 | /* Builds a section table for OBJFILE. | |
144 | Returns 0 if OK, 1 on error (in which case bfd_error contains the | |
96baa820 JM |
145 | error). |
146 | ||
147 | Note that while we are building the table, which goes into the | |
148 | psymbol obstack, we hijack the sections_end pointer to instead hold | |
149 | a count of the number of sections. When bfd_map_over_sections | |
150 | returns, this count is used to compute the pointer to the end of | |
151 | the sections table, which then overwrites the count. | |
152 | ||
153 | Also note that the OFFSET and OVLY_MAPPED in each table entry | |
154 | are initialized to zero. | |
155 | ||
156 | Also note that if anything else writes to the psymbol obstack while | |
157 | we are building the table, we're pretty much hosed. */ | |
c906108c SS |
158 | |
159 | int | |
fba45db2 | 160 | build_objfile_section_table (struct objfile *objfile) |
c906108c SS |
161 | { |
162 | /* objfile->sections can be already set when reading a mapped symbol | |
163 | file. I believe that we do need to rebuild the section table in | |
164 | this case (we rebuild other things derived from the bfd), but we | |
8b92e4d5 | 165 | can't free the old one (it's in the objfile_obstack). So we just |
c906108c SS |
166 | waste some memory. */ |
167 | ||
168 | objfile->sections_end = 0; | |
f1f6aadf PA |
169 | bfd_map_over_sections (objfile->obfd, |
170 | add_to_objfile_sections, (void *) objfile); | |
171 | objfile->sections = obstack_finish (&objfile->objfile_obstack); | |
172 | objfile->sections_end = objfile->sections + (size_t) objfile->sections_end; | |
c5aa993b | 173 | return (0); |
c906108c SS |
174 | } |
175 | ||
2df3850c JM |
176 | /* Given a pointer to an initialized bfd (ABFD) and some flag bits |
177 | allocate a new objfile struct, fill it in as best we can, link it | |
178 | into the list of all known objfiles, and return a pointer to the | |
179 | new objfile struct. | |
c906108c | 180 | |
2df3850c | 181 | The FLAGS word contains various bits (OBJF_*) that can be taken as |
78a4a9b9 AC |
182 | requests for specific operations. Other bits like OBJF_SHARED are |
183 | simply copied through to the new objfile flags member. */ | |
c906108c | 184 | |
eb9a305d DC |
185 | /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0 |
186 | by jv-lang.c, to create an artificial objfile used to hold | |
187 | information about dynamically-loaded Java classes. Unfortunately, | |
188 | that branch of this function doesn't get tested very frequently, so | |
189 | it's prone to breakage. (E.g. at one time the name was set to NULL | |
190 | in that situation, which broke a loop over all names in the dynamic | |
191 | library loader.) If you change this function, please try to leave | |
192 | things in a consistent state even if abfd is NULL. */ | |
193 | ||
c906108c | 194 | struct objfile * |
fba45db2 | 195 | allocate_objfile (bfd *abfd, int flags) |
c906108c | 196 | { |
2f6e5d7e | 197 | struct objfile *objfile; |
c906108c | 198 | |
6a0fa043 | 199 | objfile = (struct objfile *) xzalloc (sizeof (struct objfile)); |
2f6e5d7e TG |
200 | objfile->psymbol_cache = bcache_xmalloc (); |
201 | objfile->macro_cache = bcache_xmalloc (); | |
10abe6bf | 202 | objfile->filename_cache = bcache_xmalloc (); |
2f6e5d7e TG |
203 | /* We could use obstack_specify_allocation here instead, but |
204 | gdb_obstack.h specifies the alloc/dealloc functions. */ | |
205 | obstack_init (&objfile->objfile_obstack); | |
206 | terminate_minimal_symbol_table (objfile); | |
c906108c | 207 | |
0d0e1a63 MK |
208 | objfile_alloc_data (objfile); |
209 | ||
c906108c SS |
210 | /* Update the per-objfile information that comes from the bfd, ensuring |
211 | that any data that is reference is saved in the per-objfile data | |
212 | region. */ | |
213 | ||
3db741ef | 214 | objfile->obfd = gdb_bfd_ref (abfd); |
c5aa993b | 215 | if (objfile->name != NULL) |
c906108c | 216 | { |
2dc74dc1 | 217 | xfree (objfile->name); |
c906108c SS |
218 | } |
219 | if (abfd != NULL) | |
220 | { | |
5e2b427d UW |
221 | /* Look up the gdbarch associated with the BFD. */ |
222 | objfile->gdbarch = gdbarch_from_bfd (abfd); | |
223 | ||
982526a1 | 224 | objfile->name = xstrdup (bfd_get_filename (abfd)); |
c5aa993b | 225 | objfile->mtime = bfd_get_mtime (abfd); |
c906108c SS |
226 | |
227 | /* Build section table. */ | |
228 | ||
229 | if (build_objfile_section_table (objfile)) | |
230 | { | |
8a3fe4f8 | 231 | error (_("Can't find the file sections in `%s': %s"), |
c5aa993b | 232 | objfile->name, bfd_errmsg (bfd_get_error ())); |
c906108c SS |
233 | } |
234 | } | |
eb9a305d DC |
235 | else |
236 | { | |
982526a1 | 237 | objfile->name = xstrdup ("<<anonymous objfile>>"); |
eb9a305d | 238 | } |
c906108c | 239 | |
6c95b8df PA |
240 | objfile->pspace = current_program_space; |
241 | ||
b8fbeb18 EZ |
242 | /* Initialize the section indexes for this objfile, so that we can |
243 | later detect if they are used w/o being properly assigned to. */ | |
244 | ||
5c4e30ca DC |
245 | objfile->sect_index_text = -1; |
246 | objfile->sect_index_data = -1; | |
247 | objfile->sect_index_bss = -1; | |
248 | objfile->sect_index_rodata = -1; | |
249 | ||
250 | /* We don't yet have a C++-specific namespace symtab. */ | |
251 | ||
252 | objfile->cp_namespace_symtab = NULL; | |
b8fbeb18 | 253 | |
c906108c SS |
254 | /* Add this file onto the tail of the linked list of other such files. */ |
255 | ||
c5aa993b | 256 | objfile->next = NULL; |
c906108c SS |
257 | if (object_files == NULL) |
258 | object_files = objfile; | |
259 | else | |
260 | { | |
2f6e5d7e TG |
261 | struct objfile *last_one; |
262 | ||
c906108c | 263 | for (last_one = object_files; |
c5aa993b JM |
264 | last_one->next; |
265 | last_one = last_one->next); | |
266 | last_one->next = objfile; | |
c906108c SS |
267 | } |
268 | ||
2df3850c JM |
269 | /* Save passed in flag bits. */ |
270 | objfile->flags |= flags; | |
c906108c | 271 | |
6c95b8df PA |
272 | /* Rebuild section map next time we need it. */ |
273 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; | |
bb272892 | 274 | |
6c95b8df | 275 | return objfile; |
c906108c SS |
276 | } |
277 | ||
5e2b427d UW |
278 | /* Retrieve the gdbarch associated with OBJFILE. */ |
279 | struct gdbarch * | |
280 | get_objfile_arch (struct objfile *objfile) | |
281 | { | |
282 | return objfile->gdbarch; | |
283 | } | |
284 | ||
9ab9195f EZ |
285 | /* Initialize entry point information for this objfile. */ |
286 | ||
287 | void | |
288 | init_entry_point_info (struct objfile *objfile) | |
289 | { | |
290 | /* Save startup file's range of PC addresses to help blockframe.c | |
291 | decide where the bottom of the stack is. */ | |
292 | ||
293 | if (bfd_get_file_flags (objfile->obfd) & EXEC_P) | |
294 | { | |
295 | /* Executable file -- record its entry point so we'll recognize | |
296 | the startup file because it contains the entry point. */ | |
297 | objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); | |
abd0a5fa | 298 | objfile->ei.entry_point_p = 1; |
9ab9195f | 299 | } |
574dffa2 DJ |
300 | else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC |
301 | && bfd_get_start_address (objfile->obfd) != 0) | |
abd0a5fa JK |
302 | { |
303 | /* Some shared libraries may have entry points set and be | |
304 | runnable. There's no clear way to indicate this, so just check | |
305 | for values other than zero. */ | |
306 | objfile->ei.entry_point = bfd_get_start_address (objfile->obfd); | |
307 | objfile->ei.entry_point_p = 1; | |
308 | } | |
9ab9195f EZ |
309 | else |
310 | { | |
311 | /* Examination of non-executable.o files. Short-circuit this stuff. */ | |
abd0a5fa | 312 | objfile->ei.entry_point_p = 0; |
9ab9195f | 313 | } |
9ab9195f EZ |
314 | } |
315 | ||
abd0a5fa JK |
316 | /* If there is a valid and known entry point, function fills *ENTRY_P with it |
317 | and returns non-zero; otherwise it returns zero. */ | |
9ab9195f | 318 | |
abd0a5fa JK |
319 | int |
320 | entry_point_address_query (CORE_ADDR *entry_p) | |
9ab9195f | 321 | { |
3612b192 DJ |
322 | struct gdbarch *gdbarch; |
323 | CORE_ADDR entry_point; | |
324 | ||
abd0a5fa | 325 | if (symfile_objfile == NULL || !symfile_objfile->ei.entry_point_p) |
3612b192 DJ |
326 | return 0; |
327 | ||
328 | gdbarch = get_objfile_arch (symfile_objfile); | |
329 | ||
330 | entry_point = symfile_objfile->ei.entry_point; | |
331 | ||
332 | /* Make certain that the address points at real code, and not a | |
333 | function descriptor. */ | |
334 | entry_point = gdbarch_convert_from_func_ptr_addr (gdbarch, entry_point, | |
335 | ¤t_target); | |
336 | ||
337 | /* Remove any ISA markers, so that this matches entries in the | |
338 | symbol table. */ | |
339 | entry_point = gdbarch_addr_bits_remove (gdbarch, entry_point); | |
340 | ||
abd0a5fa JK |
341 | *entry_p = entry_point; |
342 | return 1; | |
343 | } | |
344 | ||
345 | /* Get current entry point address. Call error if it is not known. */ | |
346 | ||
347 | CORE_ADDR | |
348 | entry_point_address (void) | |
349 | { | |
350 | CORE_ADDR retval; | |
351 | ||
352 | if (!entry_point_address_query (&retval)) | |
353 | error (_("Entry point address is not known.")); | |
354 | ||
355 | return retval; | |
9ab9195f | 356 | } |
15831452 JB |
357 | |
358 | /* Create the terminating entry of OBJFILE's minimal symbol table. | |
359 | If OBJFILE->msymbols is zero, allocate a single entry from | |
4a146b47 | 360 | OBJFILE->objfile_obstack; otherwise, just initialize |
15831452 JB |
361 | OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */ |
362 | void | |
363 | terminate_minimal_symbol_table (struct objfile *objfile) | |
364 | { | |
365 | if (! objfile->msymbols) | |
366 | objfile->msymbols = ((struct minimal_symbol *) | |
4a146b47 | 367 | obstack_alloc (&objfile->objfile_obstack, |
15831452 JB |
368 | sizeof (objfile->msymbols[0]))); |
369 | ||
370 | { | |
371 | struct minimal_symbol *m | |
372 | = &objfile->msymbols[objfile->minimal_symbol_count]; | |
373 | ||
374 | memset (m, 0, sizeof (*m)); | |
5bf0017e EZ |
375 | /* Don't rely on these enumeration values being 0's. */ |
376 | MSYMBOL_TYPE (m) = mst_unknown; | |
15831452 JB |
377 | SYMBOL_INIT_LANGUAGE_SPECIFIC (m, language_unknown); |
378 | } | |
379 | } | |
380 | ||
15d123c9 TG |
381 | /* Iterator on PARENT and every separate debug objfile of PARENT. |
382 | The usage pattern is: | |
383 | for (objfile = parent; | |
384 | objfile; | |
385 | objfile = objfile_separate_debug_iterate (parent, objfile)) | |
386 | ... | |
387 | */ | |
388 | ||
389 | struct objfile * | |
390 | objfile_separate_debug_iterate (const struct objfile *parent, | |
391 | const struct objfile *objfile) | |
392 | { | |
393 | struct objfile *res; | |
394 | ||
395 | res = objfile->separate_debug_objfile; | |
396 | if (res) | |
397 | return res; | |
398 | ||
399 | res = objfile->separate_debug_objfile_link; | |
400 | if (res) | |
401 | return res; | |
402 | ||
403 | /* Common case where there is no separate debug objfile. */ | |
404 | if (objfile == parent) | |
405 | return NULL; | |
406 | ||
407 | for (res = objfile->separate_debug_objfile_backlink; | |
408 | res != parent; | |
409 | res = res->separate_debug_objfile_backlink) | |
410 | { | |
411 | gdb_assert (res != NULL); | |
412 | if (res->separate_debug_objfile_link) | |
413 | return res->separate_debug_objfile_link; | |
414 | } | |
415 | return NULL; | |
416 | } | |
15831452 | 417 | |
5b5d99cf JB |
418 | /* Put one object file before a specified on in the global list. |
419 | This can be used to make sure an object file is destroyed before | |
420 | another when using ALL_OBJFILES_SAFE to free all objfiles. */ | |
421 | void | |
422 | put_objfile_before (struct objfile *objfile, struct objfile *before_this) | |
423 | { | |
424 | struct objfile **objp; | |
425 | ||
426 | unlink_objfile (objfile); | |
427 | ||
428 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
429 | { | |
430 | if (*objp == before_this) | |
431 | { | |
432 | objfile->next = *objp; | |
433 | *objp = objfile; | |
434 | return; | |
435 | } | |
436 | } | |
437 | ||
438 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 439 | _("put_objfile_before: before objfile not in list")); |
5b5d99cf JB |
440 | } |
441 | ||
c906108c SS |
442 | /* Put OBJFILE at the front of the list. */ |
443 | ||
444 | void | |
fba45db2 | 445 | objfile_to_front (struct objfile *objfile) |
c906108c SS |
446 | { |
447 | struct objfile **objp; | |
448 | for (objp = &object_files; *objp != NULL; objp = &((*objp)->next)) | |
449 | { | |
450 | if (*objp == objfile) | |
451 | { | |
452 | /* Unhook it from where it is. */ | |
453 | *objp = objfile->next; | |
454 | /* Put it in the front. */ | |
455 | objfile->next = object_files; | |
456 | object_files = objfile; | |
457 | break; | |
458 | } | |
459 | } | |
460 | } | |
461 | ||
462 | /* Unlink OBJFILE from the list of known objfiles, if it is found in the | |
463 | list. | |
464 | ||
465 | It is not a bug, or error, to call this function if OBJFILE is not known | |
466 | to be in the current list. This is done in the case of mapped objfiles, | |
467 | for example, just to ensure that the mapped objfile doesn't appear twice | |
468 | in the list. Since the list is threaded, linking in a mapped objfile | |
469 | twice would create a circular list. | |
470 | ||
471 | If OBJFILE turns out to be in the list, we zap it's NEXT pointer after | |
472 | unlinking it, just to ensure that we have completely severed any linkages | |
473 | between the OBJFILE and the list. */ | |
474 | ||
475 | void | |
fba45db2 | 476 | unlink_objfile (struct objfile *objfile) |
c906108c | 477 | { |
c5aa993b | 478 | struct objfile **objpp; |
c906108c | 479 | |
c5aa993b | 480 | for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next)) |
c906108c | 481 | { |
c5aa993b | 482 | if (*objpp == objfile) |
c906108c | 483 | { |
c5aa993b JM |
484 | *objpp = (*objpp)->next; |
485 | objfile->next = NULL; | |
07cd4b97 | 486 | return; |
c906108c SS |
487 | } |
488 | } | |
07cd4b97 | 489 | |
8e65ff28 | 490 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 491 | _("unlink_objfile: objfile already unlinked")); |
c906108c SS |
492 | } |
493 | ||
15d123c9 TG |
494 | /* Add OBJFILE as a separate debug objfile of PARENT. */ |
495 | ||
496 | void | |
497 | add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent) | |
498 | { | |
499 | gdb_assert (objfile && parent); | |
500 | ||
501 | /* Must not be already in a list. */ | |
502 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
503 | gdb_assert (objfile->separate_debug_objfile_link == NULL); | |
504 | ||
505 | objfile->separate_debug_objfile_backlink = parent; | |
506 | objfile->separate_debug_objfile_link = parent->separate_debug_objfile; | |
507 | parent->separate_debug_objfile = objfile; | |
508 | ||
509 | /* Put the separate debug object before the normal one, this is so that | |
510 | usage of the ALL_OBJFILES_SAFE macro will stay safe. */ | |
511 | put_objfile_before (objfile, parent); | |
512 | } | |
513 | ||
514 | /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE | |
515 | itself. */ | |
516 | ||
517 | void | |
518 | free_objfile_separate_debug (struct objfile *objfile) | |
519 | { | |
520 | struct objfile *child; | |
521 | ||
522 | for (child = objfile->separate_debug_objfile; child;) | |
523 | { | |
524 | struct objfile *next_child = child->separate_debug_objfile_link; | |
525 | free_objfile (child); | |
526 | child = next_child; | |
527 | } | |
528 | } | |
c906108c SS |
529 | |
530 | /* Destroy an objfile and all the symtabs and psymtabs under it. Note | |
4a146b47 EZ |
531 | that as much as possible is allocated on the objfile_obstack |
532 | so that the memory can be efficiently freed. | |
c906108c SS |
533 | |
534 | Things which we do NOT free because they are not in malloc'd memory | |
535 | or not in memory specific to the objfile include: | |
536 | ||
c5aa993b | 537 | objfile -> sf |
c906108c SS |
538 | |
539 | FIXME: If the objfile is using reusable symbol information (via mmalloc), | |
540 | then we need to take into account the fact that more than one process | |
541 | may be using the symbol information at the same time (when mmalloc is | |
542 | extended to support cooperative locking). When more than one process | |
543 | is using the mapped symbol info, we need to be more careful about when | |
544 | we free objects in the reusable area. */ | |
545 | ||
546 | void | |
fba45db2 | 547 | free_objfile (struct objfile *objfile) |
c906108c | 548 | { |
15d123c9 TG |
549 | /* Free all separate debug objfiles. */ |
550 | free_objfile_separate_debug (objfile); | |
551 | ||
5b5d99cf JB |
552 | if (objfile->separate_debug_objfile_backlink) |
553 | { | |
554 | /* We freed the separate debug file, make sure the base objfile | |
555 | doesn't reference it. */ | |
15d123c9 TG |
556 | struct objfile *child; |
557 | ||
558 | child = objfile->separate_debug_objfile_backlink->separate_debug_objfile; | |
559 | ||
560 | if (child == objfile) | |
561 | { | |
562 | /* OBJFILE is the first child. */ | |
563 | objfile->separate_debug_objfile_backlink->separate_debug_objfile = | |
564 | objfile->separate_debug_objfile_link; | |
565 | } | |
566 | else | |
567 | { | |
568 | /* Find OBJFILE in the list. */ | |
569 | while (1) | |
570 | { | |
571 | if (child->separate_debug_objfile_link == objfile) | |
572 | { | |
573 | child->separate_debug_objfile_link = | |
574 | objfile->separate_debug_objfile_link; | |
575 | break; | |
576 | } | |
577 | child = child->separate_debug_objfile_link; | |
578 | gdb_assert (child); | |
579 | } | |
580 | } | |
5b5d99cf JB |
581 | } |
582 | ||
ae5a43e0 DJ |
583 | /* Remove any references to this objfile in the global value |
584 | lists. */ | |
585 | preserve_values (objfile); | |
586 | ||
c906108c SS |
587 | /* First do any symbol file specific actions required when we are |
588 | finished with a particular symbol file. Note that if the objfile | |
589 | is using reusable symbol information (via mmalloc) then each of | |
590 | these routines is responsible for doing the correct thing, either | |
591 | freeing things which are valid only during this particular gdb | |
592 | execution, or leaving them to be reused during the next one. */ | |
593 | ||
c5aa993b | 594 | if (objfile->sf != NULL) |
c906108c | 595 | { |
c5aa993b | 596 | (*objfile->sf->sym_finish) (objfile); |
c906108c SS |
597 | } |
598 | ||
c5bc3a77 DJ |
599 | /* Discard any data modules have associated with the objfile. */ |
600 | objfile_free_data (objfile); | |
601 | ||
e3c69974 | 602 | gdb_bfd_unref (objfile->obfd); |
c906108c SS |
603 | |
604 | /* Remove it from the chain of all objfiles. */ | |
605 | ||
606 | unlink_objfile (objfile); | |
607 | ||
adb7f338 JK |
608 | if (objfile == symfile_objfile) |
609 | symfile_objfile = NULL; | |
c906108c SS |
610 | |
611 | if (objfile == rt_common_objfile) | |
612 | rt_common_objfile = NULL; | |
613 | ||
614 | /* Before the symbol table code was redone to make it easier to | |
615 | selectively load and remove information particular to a specific | |
616 | linkage unit, gdb used to do these things whenever the monolithic | |
617 | symbol table was blown away. How much still needs to be done | |
618 | is unknown, but we play it safe for now and keep each action until | |
619 | it is shown to be no longer needed. */ | |
c5aa993b | 620 | |
cb5d864f FF |
621 | /* Not all our callers call clear_symtab_users (objfile_purge_solibs, |
622 | for example), so we need to call this here. */ | |
c906108c SS |
623 | clear_pc_function_cache (); |
624 | ||
9bdcbae7 DJ |
625 | /* Clear globals which might have pointed into a removed objfile. |
626 | FIXME: It's not clear which of these are supposed to persist | |
627 | between expressions and which ought to be reset each time. */ | |
628 | expression_context_block = NULL; | |
629 | innermost_block = NULL; | |
630 | ||
cb5d864f FF |
631 | /* Check to see if the current_source_symtab belongs to this objfile, |
632 | and if so, call clear_current_source_symtab_and_line. */ | |
633 | ||
634 | { | |
635 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
636 | struct symtab *s; | |
637 | ||
638 | ALL_OBJFILE_SYMTABS (objfile, s) | |
639 | { | |
640 | if (s == cursal.symtab) | |
641 | clear_current_source_symtab_and_line (); | |
642 | } | |
643 | } | |
644 | ||
78a4a9b9 | 645 | /* The last thing we do is free the objfile struct itself. */ |
c906108c | 646 | |
78a4a9b9 | 647 | if (objfile->name != NULL) |
c906108c | 648 | { |
2dc74dc1 | 649 | xfree (objfile->name); |
c906108c | 650 | } |
78a4a9b9 | 651 | if (objfile->global_psymbols.list) |
2dc74dc1 | 652 | xfree (objfile->global_psymbols.list); |
78a4a9b9 | 653 | if (objfile->static_psymbols.list) |
2dc74dc1 | 654 | xfree (objfile->static_psymbols.list); |
78a4a9b9 AC |
655 | /* Free the obstacks for non-reusable objfiles */ |
656 | bcache_xfree (objfile->psymbol_cache); | |
657 | bcache_xfree (objfile->macro_cache); | |
10abe6bf | 658 | bcache_xfree (objfile->filename_cache); |
78a4a9b9 AC |
659 | if (objfile->demangled_names_hash) |
660 | htab_delete (objfile->demangled_names_hash); | |
b99607ea | 661 | obstack_free (&objfile->objfile_obstack, 0); |
6c95b8df PA |
662 | |
663 | /* Rebuild section map next time we need it. */ | |
664 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; | |
665 | ||
2dc74dc1 | 666 | xfree (objfile); |
c906108c SS |
667 | } |
668 | ||
74b7792f AC |
669 | static void |
670 | do_free_objfile_cleanup (void *obj) | |
671 | { | |
672 | free_objfile (obj); | |
673 | } | |
674 | ||
675 | struct cleanup * | |
676 | make_cleanup_free_objfile (struct objfile *obj) | |
677 | { | |
678 | return make_cleanup (do_free_objfile_cleanup, obj); | |
679 | } | |
c906108c SS |
680 | |
681 | /* Free all the object files at once and clean up their users. */ | |
682 | ||
683 | void | |
fba45db2 | 684 | free_all_objfiles (void) |
c906108c SS |
685 | { |
686 | struct objfile *objfile, *temp; | |
687 | ||
688 | ALL_OBJFILES_SAFE (objfile, temp) | |
c5aa993b JM |
689 | { |
690 | free_objfile (objfile); | |
691 | } | |
c906108c SS |
692 | clear_symtab_users (); |
693 | } | |
694 | \f | |
695 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS | |
567995e1 JK |
696 | entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here. */ |
697 | ||
698 | static void | |
699 | objfile_relocate1 (struct objfile *objfile, struct section_offsets *new_offsets) | |
c906108c | 700 | { |
30510692 | 701 | struct obj_section *s; |
d4f3574e | 702 | struct section_offsets *delta = |
a39a16c4 MM |
703 | ((struct section_offsets *) |
704 | alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections))); | |
c906108c SS |
705 | |
706 | { | |
707 | int i; | |
708 | int something_changed = 0; | |
709 | for (i = 0; i < objfile->num_sections; ++i) | |
710 | { | |
a4c8257b | 711 | delta->offsets[i] = |
c906108c SS |
712 | ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i); |
713 | if (ANOFFSET (delta, i) != 0) | |
714 | something_changed = 1; | |
715 | } | |
716 | if (!something_changed) | |
717 | return; | |
718 | } | |
719 | ||
720 | /* OK, get all the symtabs. */ | |
721 | { | |
722 | struct symtab *s; | |
723 | ||
724 | ALL_OBJFILE_SYMTABS (objfile, s) | |
c5aa993b JM |
725 | { |
726 | struct linetable *l; | |
727 | struct blockvector *bv; | |
728 | int i; | |
729 | ||
730 | /* First the line table. */ | |
731 | l = LINETABLE (s); | |
732 | if (l) | |
733 | { | |
734 | for (i = 0; i < l->nitems; ++i) | |
735 | l->item[i].pc += ANOFFSET (delta, s->block_line_section); | |
736 | } | |
c906108c | 737 | |
c5aa993b JM |
738 | /* Don't relocate a shared blockvector more than once. */ |
739 | if (!s->primary) | |
740 | continue; | |
c906108c | 741 | |
c5aa993b | 742 | bv = BLOCKVECTOR (s); |
b101f7a1 UW |
743 | if (BLOCKVECTOR_MAP (bv)) |
744 | addrmap_relocate (BLOCKVECTOR_MAP (bv), | |
745 | ANOFFSET (delta, s->block_line_section)); | |
746 | ||
c5aa993b JM |
747 | for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i) |
748 | { | |
749 | struct block *b; | |
e88c90f2 | 750 | struct symbol *sym; |
de4f826b | 751 | struct dict_iterator iter; |
c5aa993b JM |
752 | |
753 | b = BLOCKVECTOR_BLOCK (bv, i); | |
754 | BLOCK_START (b) += ANOFFSET (delta, s->block_line_section); | |
755 | BLOCK_END (b) += ANOFFSET (delta, s->block_line_section); | |
756 | ||
de4f826b | 757 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
c5aa993b | 758 | { |
7a78d0ee KB |
759 | fixup_symbol_section (sym, objfile); |
760 | ||
c5aa993b | 761 | /* The RS6000 code from which this was taken skipped |
176620f1 | 762 | any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN. |
c5aa993b JM |
763 | But I'm leaving out that test, on the theory that |
764 | they can't possibly pass the tests below. */ | |
765 | if ((SYMBOL_CLASS (sym) == LOC_LABEL | |
0bb4e8c4 | 766 | || SYMBOL_CLASS (sym) == LOC_STATIC) |
c5aa993b JM |
767 | && SYMBOL_SECTION (sym) >= 0) |
768 | { | |
769 | SYMBOL_VALUE_ADDRESS (sym) += | |
770 | ANOFFSET (delta, SYMBOL_SECTION (sym)); | |
771 | } | |
c5aa993b JM |
772 | } |
773 | } | |
774 | } | |
c906108c SS |
775 | } |
776 | ||
9b14d7aa JK |
777 | if (objfile->psymtabs_addrmap) |
778 | addrmap_relocate (objfile->psymtabs_addrmap, | |
779 | ANOFFSET (delta, SECT_OFF_TEXT (objfile))); | |
780 | ||
c906108c SS |
781 | { |
782 | struct partial_symtab *p; | |
783 | ||
784 | ALL_OBJFILE_PSYMTABS (objfile, p) | |
c5aa993b | 785 | { |
b8fbeb18 EZ |
786 | p->textlow += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); |
787 | p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); | |
c5aa993b | 788 | } |
c906108c SS |
789 | } |
790 | ||
791 | { | |
792 | struct partial_symbol **psym; | |
793 | ||
794 | for (psym = objfile->global_psymbols.list; | |
795 | psym < objfile->global_psymbols.next; | |
796 | psym++) | |
7a78d0ee KB |
797 | { |
798 | fixup_psymbol_section (*psym, objfile); | |
799 | if (SYMBOL_SECTION (*psym) >= 0) | |
800 | SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta, | |
801 | SYMBOL_SECTION (*psym)); | |
802 | } | |
c906108c SS |
803 | for (psym = objfile->static_psymbols.list; |
804 | psym < objfile->static_psymbols.next; | |
805 | psym++) | |
7a78d0ee KB |
806 | { |
807 | fixup_psymbol_section (*psym, objfile); | |
808 | if (SYMBOL_SECTION (*psym) >= 0) | |
809 | SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta, | |
810 | SYMBOL_SECTION (*psym)); | |
811 | } | |
c906108c SS |
812 | } |
813 | ||
814 | { | |
815 | struct minimal_symbol *msym; | |
816 | ALL_OBJFILE_MSYMBOLS (objfile, msym) | |
817 | if (SYMBOL_SECTION (msym) >= 0) | |
c5aa993b | 818 | SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym)); |
c906108c SS |
819 | } |
820 | /* Relocating different sections by different amounts may cause the symbols | |
821 | to be out of order. */ | |
822 | msymbols_sort (objfile); | |
823 | ||
abd0a5fa | 824 | if (objfile->ei.entry_point_p) |
36b0c0e0 PS |
825 | { |
826 | /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT | |
827 | only as a fallback. */ | |
828 | struct obj_section *s; | |
829 | s = find_pc_section (objfile->ei.entry_point); | |
830 | if (s) | |
831 | objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index); | |
832 | else | |
833 | objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); | |
834 | } | |
835 | ||
f1f2b5f4 PA |
836 | { |
837 | int i; | |
838 | for (i = 0; i < objfile->num_sections; ++i) | |
839 | (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i); | |
840 | } | |
841 | ||
842 | /* Rebuild section map next time we need it. */ | |
6c95b8df | 843 | get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1; |
f1f2b5f4 | 844 | |
30510692 DJ |
845 | /* Update the table in exec_ops, used to read memory. */ |
846 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
847 | { | |
848 | int idx = s->the_bfd_section->index; | |
849 | ||
850 | exec_set_section_address (bfd_get_filename (objfile->obfd), idx, | |
f1f6aadf | 851 | obj_section_addr (s)); |
30510692 | 852 | } |
567995e1 JK |
853 | } |
854 | ||
855 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS | |
856 | entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs. | |
857 | ||
858 | The number and ordering of sections does differ between the two objfiles. | |
859 | Only their names match. Also the file offsets will differ (objfile being | |
860 | possibly prelinked but separate_debug_objfile is probably not prelinked) but | |
861 | the in-memory absolute address as specified by NEW_OFFSETS must match both | |
862 | files. */ | |
863 | ||
864 | void | |
865 | objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets) | |
866 | { | |
867 | struct objfile *debug_objfile; | |
868 | ||
869 | objfile_relocate1 (objfile, new_offsets); | |
870 | ||
871 | for (debug_objfile = objfile->separate_debug_objfile; | |
872 | debug_objfile; | |
873 | debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile)) | |
874 | { | |
875 | struct section_addr_info *objfile_addrs; | |
876 | struct section_offsets *new_debug_offsets; | |
877 | int new_debug_num_sections; | |
878 | struct cleanup *my_cleanups; | |
879 | ||
880 | objfile_addrs = build_section_addr_info_from_objfile (objfile); | |
881 | my_cleanups = make_cleanup (xfree, objfile_addrs); | |
882 | ||
883 | /* Here OBJFILE_ADDRS contain the correct absolute addresses, the | |
884 | relative ones must be already created according to debug_objfile. */ | |
885 | ||
886 | addr_info_make_relative (objfile_addrs, debug_objfile->obfd); | |
887 | ||
888 | gdb_assert (debug_objfile->num_sections | |
889 | == bfd_count_sections (debug_objfile->obfd)); | |
890 | new_debug_offsets = xmalloc (SIZEOF_N_SECTION_OFFSETS | |
891 | (debug_objfile->num_sections)); | |
892 | make_cleanup (xfree, new_debug_offsets); | |
893 | relative_addr_info_to_section_offsets (new_debug_offsets, | |
894 | debug_objfile->num_sections, | |
895 | objfile_addrs); | |
896 | ||
897 | objfile_relocate1 (debug_objfile, new_debug_offsets); | |
898 | ||
899 | do_cleanups (my_cleanups); | |
900 | } | |
30510692 | 901 | |
c906108c | 902 | /* Relocate breakpoints as necessary, after things are relocated. */ |
69de3c6a | 903 | breakpoint_re_set (); |
c906108c SS |
904 | } |
905 | \f | |
55333a84 DE |
906 | /* Return non-zero if OBJFILE has partial symbols. */ |
907 | ||
908 | int | |
909 | objfile_has_partial_symbols (struct objfile *objfile) | |
910 | { | |
911 | return objfile->psymtabs != NULL; | |
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 | |
939 | available, nonzero otherwise. */ | |
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 | |
956 | available, nonzero otherwise. */ | |
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 | |
974 | command. | |
c5aa993b | 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 | |
985 | be soon. | |
c5aa993b | 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 | |
995 | available, nonzero otherwise. */ | |
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 | |
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, | |
1031 | or something like that. */ | |
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. */ | |
1067 | gdb_assert (0); | |
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. */ | |
1082 | gdb_assert (0); | |
1083 | } | |
1084 | ||
1085 | } | |
1086 | ||
1087 | /* Unreachable. */ | |
1088 | gdb_assert (0); | |
a845f5cb PP |
1089 | return 0; |
1090 | } | |
1091 | ||
3aad21cf PP |
1092 | /* Select "better" obj_section to keep. We prefer the one that came from |
1093 | the real object, rather than the one from separate debuginfo. | |
1094 | Most of the time the two sections are exactly identical, but with | |
1095 | prelinking the .rel.dyn section in the real object may have different | |
1096 | size. */ | |
1097 | ||
1098 | static struct obj_section * | |
1099 | preferred_obj_section (struct obj_section *a, struct obj_section *b) | |
1100 | { | |
1101 | gdb_assert (obj_section_addr (a) == obj_section_addr (b)); | |
1102 | gdb_assert ((a->objfile->separate_debug_objfile == b->objfile) | |
1103 | || (b->objfile->separate_debug_objfile == a->objfile)); | |
1104 | gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile) | |
1105 | || (b->objfile->separate_debug_objfile_backlink == a->objfile)); | |
1106 | ||
1107 | if (a->objfile->separate_debug_objfile != NULL) | |
1108 | return a; | |
1109 | return b; | |
1110 | } | |
1111 | ||
6fbf07cd PP |
1112 | /* Return 1 if SECTION should be inserted into the section map. |
1113 | We want to insert only non-overlay and non-TLS section. */ | |
1114 | ||
1115 | static int | |
1116 | insert_section_p (const struct bfd *abfd, | |
1117 | const struct bfd_section *section) | |
1118 | { | |
1119 | const bfd_vma lma = bfd_section_lma (abfd, section); | |
1120 | ||
1121 | if (lma != 0 && lma != bfd_section_vma (abfd, section) | |
1122 | && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0) | |
1123 | /* This is an overlay section. IN_MEMORY check is needed to avoid | |
1124 | discarding sections from the "system supplied DSO" (aka vdso) | |
1125 | on some Linux systems (e.g. Fedora 11). */ | |
1126 | return 0; | |
1127 | if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0) | |
1128 | /* This is a TLS section. */ | |
1129 | return 0; | |
1130 | ||
1131 | return 1; | |
1132 | } | |
1133 | ||
1134 | /* Filter out overlapping sections where one section came from the real | |
1135 | objfile, and the other from a separate debuginfo file. | |
1136 | Return the size of table after redundant sections have been eliminated. */ | |
1137 | ||
1138 | static int | |
1139 | filter_debuginfo_sections (struct obj_section **map, int map_size) | |
1140 | { | |
1141 | int i, j; | |
1142 | ||
1143 | for (i = 0, j = 0; i < map_size - 1; i++) | |
1144 | { | |
1145 | struct obj_section *const sect1 = map[i]; | |
1146 | struct obj_section *const sect2 = map[i + 1]; | |
1147 | const struct objfile *const objfile1 = sect1->objfile; | |
1148 | const struct objfile *const objfile2 = sect2->objfile; | |
1149 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1150 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1151 | ||
1152 | if (sect1_addr == sect2_addr | |
1153 | && (objfile1->separate_debug_objfile == objfile2 | |
1154 | || objfile2->separate_debug_objfile == objfile1)) | |
1155 | { | |
1156 | map[j++] = preferred_obj_section (sect1, sect2); | |
1157 | ++i; | |
1158 | } | |
1159 | else | |
1160 | map[j++] = sect1; | |
1161 | } | |
1162 | ||
1163 | if (i < map_size) | |
1164 | { | |
1165 | gdb_assert (i == map_size - 1); | |
1166 | map[j++] = map[i]; | |
1167 | } | |
1168 | ||
1169 | /* The map should not have shrunk to less than half the original size. */ | |
1170 | gdb_assert (map_size / 2 <= j); | |
1171 | ||
1172 | return j; | |
1173 | } | |
1174 | ||
1175 | /* Filter out overlapping sections, issuing a warning if any are found. | |
1176 | Overlapping sections could really be overlay sections which we didn't | |
1177 | classify as such in insert_section_p, or we could be dealing with a | |
1178 | corrupt binary. */ | |
1179 | ||
1180 | static int | |
1181 | filter_overlapping_sections (struct obj_section **map, int map_size) | |
1182 | { | |
1183 | int i, j; | |
1184 | ||
1185 | for (i = 0, j = 0; i < map_size - 1; ) | |
1186 | { | |
1187 | int k; | |
1188 | ||
1189 | map[j++] = map[i]; | |
1190 | for (k = i + 1; k < map_size; k++) | |
1191 | { | |
1192 | struct obj_section *const sect1 = map[i]; | |
1193 | struct obj_section *const sect2 = map[k]; | |
1194 | const CORE_ADDR sect1_addr = obj_section_addr (sect1); | |
1195 | const CORE_ADDR sect2_addr = obj_section_addr (sect2); | |
1196 | const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1); | |
1197 | ||
1198 | gdb_assert (sect1_addr <= sect2_addr); | |
1199 | ||
1200 | if (sect1_endaddr <= sect2_addr) | |
1201 | break; | |
1202 | else | |
1203 | { | |
1204 | /* We have an overlap. Report it. */ | |
1205 | ||
1206 | struct objfile *const objf1 = sect1->objfile; | |
1207 | struct objfile *const objf2 = sect2->objfile; | |
1208 | ||
1209 | const struct bfd *const abfd1 = objf1->obfd; | |
1210 | const struct bfd *const abfd2 = objf2->obfd; | |
1211 | ||
1212 | const struct bfd_section *const bfds1 = sect1->the_bfd_section; | |
1213 | const struct bfd_section *const bfds2 = sect2->the_bfd_section; | |
1214 | ||
1215 | const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2); | |
1216 | ||
1217 | struct gdbarch *const gdbarch = get_objfile_arch (objf1); | |
1218 | ||
1219 | complaint (&symfile_complaints, | |
1220 | _("unexpected overlap between:\n" | |
1221 | " (A) section `%s' from `%s' [%s, %s)\n" | |
1222 | " (B) section `%s' from `%s' [%s, %s).\n" | |
1223 | "Will ignore section B"), | |
1224 | bfd_section_name (abfd1, bfds1), objf1->name, | |
1225 | paddress (gdbarch, sect1_addr), | |
1226 | paddress (gdbarch, sect1_endaddr), | |
1227 | bfd_section_name (abfd2, bfds2), objf2->name, | |
1228 | paddress (gdbarch, sect2_addr), | |
1229 | paddress (gdbarch, sect2_endaddr)); | |
1230 | } | |
1231 | } | |
1232 | i = k; | |
1233 | } | |
1234 | ||
1235 | if (i < map_size) | |
1236 | { | |
1237 | gdb_assert (i == map_size - 1); | |
1238 | map[j++] = map[i]; | |
1239 | } | |
1240 | ||
1241 | return j; | |
1242 | } | |
1243 | ||
1244 | ||
1245 | /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any | |
1246 | TLS, overlay and overlapping sections. */ | |
a845f5cb PP |
1247 | |
1248 | static void | |
6c95b8df PA |
1249 | update_section_map (struct program_space *pspace, |
1250 | struct obj_section ***pmap, int *pmap_size) | |
a845f5cb | 1251 | { |
6fbf07cd | 1252 | int alloc_size, map_size, i; |
a845f5cb PP |
1253 | struct obj_section *s, **map; |
1254 | struct objfile *objfile; | |
1255 | ||
6c95b8df | 1256 | gdb_assert (get_objfile_pspace_data (pspace)->objfiles_changed_p != 0); |
a845f5cb PP |
1257 | |
1258 | map = *pmap; | |
1259 | xfree (map); | |
1260 | ||
6fbf07cd | 1261 | alloc_size = 0; |
6c95b8df PA |
1262 | ALL_PSPACE_OBJFILES (pspace, objfile) |
1263 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
1264 | if (insert_section_p (objfile->obfd, s->the_bfd_section)) | |
1265 | alloc_size += 1; | |
a845f5cb | 1266 | |
65a97ab3 PP |
1267 | /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */ |
1268 | if (alloc_size == 0) | |
1269 | { | |
1270 | *pmap = NULL; | |
1271 | *pmap_size = 0; | |
1272 | return; | |
1273 | } | |
1274 | ||
6fbf07cd | 1275 | map = xmalloc (alloc_size * sizeof (*map)); |
a845f5cb | 1276 | |
3aad21cf | 1277 | i = 0; |
6c95b8df PA |
1278 | ALL_PSPACE_OBJFILES (pspace, objfile) |
1279 | ALL_OBJFILE_OSECTIONS (objfile, s) | |
1280 | if (insert_section_p (objfile->obfd, s->the_bfd_section)) | |
1281 | map[i++] = s; | |
a845f5cb | 1282 | |
6fbf07cd PP |
1283 | qsort (map, alloc_size, sizeof (*map), qsort_cmp); |
1284 | map_size = filter_debuginfo_sections(map, alloc_size); | |
1285 | map_size = filter_overlapping_sections(map, map_size); | |
a845f5cb | 1286 | |
6fbf07cd PP |
1287 | if (map_size < alloc_size) |
1288 | /* Some sections were eliminated. Trim excess space. */ | |
1289 | map = xrealloc (map, map_size * sizeof (*map)); | |
3aad21cf | 1290 | else |
6fbf07cd | 1291 | gdb_assert (alloc_size == map_size); |
3aad21cf | 1292 | |
a845f5cb PP |
1293 | *pmap = map; |
1294 | *pmap_size = map_size; | |
1295 | } | |
1296 | ||
1297 | /* Bsearch comparison function. */ | |
1298 | ||
1299 | static int | |
1300 | bsearch_cmp (const void *key, const void *elt) | |
1301 | { | |
1302 | const CORE_ADDR pc = *(CORE_ADDR *) key; | |
1303 | const struct obj_section *section = *(const struct obj_section **) elt; | |
1304 | ||
1305 | if (pc < obj_section_addr (section)) | |
1306 | return -1; | |
1307 | if (pc < obj_section_endaddr (section)) | |
1308 | return 0; | |
1309 | return 1; | |
1310 | } | |
1311 | ||
714835d5 | 1312 | /* Returns a section whose range includes PC or NULL if none found. */ |
c906108c SS |
1313 | |
1314 | struct obj_section * | |
714835d5 | 1315 | find_pc_section (CORE_ADDR pc) |
c906108c | 1316 | { |
6c95b8df | 1317 | struct objfile_pspace_info *pspace_info; |
a845f5cb | 1318 | struct obj_section *s, **sp; |
c5aa993b | 1319 | |
714835d5 UW |
1320 | /* Check for mapped overlay section first. */ |
1321 | s = find_pc_mapped_section (pc); | |
1322 | if (s) | |
1323 | return s; | |
c906108c | 1324 | |
6c95b8df PA |
1325 | pspace_info = get_objfile_pspace_data (current_program_space); |
1326 | if (pspace_info->objfiles_changed_p != 0) | |
a845f5cb | 1327 | { |
6c95b8df PA |
1328 | update_section_map (current_program_space, |
1329 | &pspace_info->sections, | |
1330 | &pspace_info->num_sections); | |
c906108c | 1331 | |
6c95b8df PA |
1332 | /* Don't need updates to section map until objfiles are added, |
1333 | removed or relocated. */ | |
1334 | pspace_info->objfiles_changed_p = 0; | |
a845f5cb PP |
1335 | } |
1336 | ||
65a97ab3 PP |
1337 | /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to |
1338 | bsearch be non-NULL. */ | |
1339 | if (pspace_info->sections == NULL) | |
1340 | { | |
1341 | gdb_assert (pspace_info->num_sections == 0); | |
1342 | return NULL; | |
1343 | } | |
1344 | ||
6c95b8df PA |
1345 | sp = (struct obj_section **) bsearch (&pc, |
1346 | pspace_info->sections, | |
1347 | pspace_info->num_sections, | |
1348 | sizeof (*pspace_info->sections), | |
1349 | bsearch_cmp); | |
a845f5cb PP |
1350 | if (sp != NULL) |
1351 | return *sp; | |
714835d5 | 1352 | return NULL; |
c906108c | 1353 | } |
c5aa993b | 1354 | |
c906108c SS |
1355 | |
1356 | /* In SVR4, we recognize a trampoline by it's section name. | |
1357 | That is, if the pc is in a section named ".plt" then we are in | |
1358 | a trampoline. */ | |
1359 | ||
1360 | int | |
fba45db2 | 1361 | in_plt_section (CORE_ADDR pc, char *name) |
c906108c SS |
1362 | { |
1363 | struct obj_section *s; | |
1364 | int retval = 0; | |
c5aa993b JM |
1365 | |
1366 | s = find_pc_section (pc); | |
1367 | ||
c906108c SS |
1368 | retval = (s != NULL |
1369 | && s->the_bfd_section->name != NULL | |
6314a349 | 1370 | && strcmp (s->the_bfd_section->name, ".plt") == 0); |
c5aa993b | 1371 | return (retval); |
c906108c | 1372 | } |
0d0e1a63 MK |
1373 | \f |
1374 | ||
1375 | /* Keep a registry of per-objfile data-pointers required by other GDB | |
1376 | modules. */ | |
1377 | ||
1378 | struct objfile_data | |
1379 | { | |
1380 | unsigned index; | |
c1bd65d0 DE |
1381 | void (*save) (struct objfile *, void *); |
1382 | void (*free) (struct objfile *, void *); | |
0d0e1a63 MK |
1383 | }; |
1384 | ||
1385 | struct objfile_data_registration | |
1386 | { | |
1387 | struct objfile_data *data; | |
1388 | struct objfile_data_registration *next; | |
1389 | }; | |
1390 | ||
1391 | struct objfile_data_registry | |
1392 | { | |
1393 | struct objfile_data_registration *registrations; | |
1394 | unsigned num_registrations; | |
1395 | }; | |
1396 | ||
1397 | static struct objfile_data_registry objfile_data_registry = { NULL, 0 }; | |
1398 | ||
1399 | const struct objfile_data * | |
c1bd65d0 DE |
1400 | register_objfile_data_with_cleanup (void (*save) (struct objfile *, void *), |
1401 | void (*free) (struct objfile *, void *)) | |
0d0e1a63 MK |
1402 | { |
1403 | struct objfile_data_registration **curr; | |
1404 | ||
1405 | /* Append new registration. */ | |
1406 | for (curr = &objfile_data_registry.registrations; | |
1407 | *curr != NULL; curr = &(*curr)->next); | |
7be570e7 | 1408 | |
0d0e1a63 MK |
1409 | *curr = XMALLOC (struct objfile_data_registration); |
1410 | (*curr)->next = NULL; | |
1411 | (*curr)->data = XMALLOC (struct objfile_data); | |
1412 | (*curr)->data->index = objfile_data_registry.num_registrations++; | |
c1bd65d0 DE |
1413 | (*curr)->data->save = save; |
1414 | (*curr)->data->free = free; | |
0d0e1a63 MK |
1415 | |
1416 | return (*curr)->data; | |
1417 | } | |
1418 | ||
60c5725c DJ |
1419 | const struct objfile_data * |
1420 | register_objfile_data (void) | |
1421 | { | |
c1bd65d0 | 1422 | return register_objfile_data_with_cleanup (NULL, NULL); |
60c5725c DJ |
1423 | } |
1424 | ||
0d0e1a63 MK |
1425 | static void |
1426 | objfile_alloc_data (struct objfile *objfile) | |
1427 | { | |
1428 | gdb_assert (objfile->data == NULL); | |
1429 | objfile->num_data = objfile_data_registry.num_registrations; | |
1430 | objfile->data = XCALLOC (objfile->num_data, void *); | |
1431 | } | |
1432 | ||
1433 | static void | |
1434 | objfile_free_data (struct objfile *objfile) | |
1435 | { | |
1436 | gdb_assert (objfile->data != NULL); | |
60c5725c | 1437 | clear_objfile_data (objfile); |
0d0e1a63 MK |
1438 | xfree (objfile->data); |
1439 | objfile->data = NULL; | |
1440 | } | |
1441 | ||
7b097ae3 MK |
1442 | void |
1443 | clear_objfile_data (struct objfile *objfile) | |
1444 | { | |
60c5725c DJ |
1445 | struct objfile_data_registration *registration; |
1446 | int i; | |
1447 | ||
7b097ae3 | 1448 | gdb_assert (objfile->data != NULL); |
60c5725c | 1449 | |
c1bd65d0 DE |
1450 | /* Process all the save handlers. */ |
1451 | ||
1452 | for (registration = objfile_data_registry.registrations, i = 0; | |
1453 | i < objfile->num_data; | |
1454 | registration = registration->next, i++) | |
1455 | if (objfile->data[i] != NULL && registration->data->save != NULL) | |
1456 | registration->data->save (objfile, objfile->data[i]); | |
1457 | ||
1458 | /* Now process all the free handlers. */ | |
1459 | ||
60c5725c DJ |
1460 | for (registration = objfile_data_registry.registrations, i = 0; |
1461 | i < objfile->num_data; | |
1462 | registration = registration->next, i++) | |
c1bd65d0 DE |
1463 | if (objfile->data[i] != NULL && registration->data->free != NULL) |
1464 | registration->data->free (objfile, objfile->data[i]); | |
60c5725c | 1465 | |
7b097ae3 MK |
1466 | memset (objfile->data, 0, objfile->num_data * sizeof (void *)); |
1467 | } | |
1468 | ||
0d0e1a63 MK |
1469 | void |
1470 | set_objfile_data (struct objfile *objfile, const struct objfile_data *data, | |
1471 | void *value) | |
1472 | { | |
1473 | gdb_assert (data->index < objfile->num_data); | |
1474 | objfile->data[data->index] = value; | |
1475 | } | |
1476 | ||
1477 | void * | |
1478 | objfile_data (struct objfile *objfile, const struct objfile_data *data) | |
1479 | { | |
1480 | gdb_assert (data->index < objfile->num_data); | |
1481 | return objfile->data[data->index]; | |
1482 | } | |
a845f5cb | 1483 | |
bb272892 PP |
1484 | /* Set objfiles_changed_p so section map will be rebuilt next time it |
1485 | is used. Called by reread_symbols. */ | |
a845f5cb PP |
1486 | |
1487 | void | |
bb272892 | 1488 | objfiles_changed (void) |
a845f5cb | 1489 | { |
6c95b8df PA |
1490 | /* Rebuild section map next time we need it. */ |
1491 | get_objfile_pspace_data (current_program_space)->objfiles_changed_p = 1; | |
a845f5cb | 1492 | } |
e3c69974 | 1493 | |
3db741ef PP |
1494 | /* Add reference to ABFD. Returns ABFD. */ |
1495 | struct bfd * | |
1496 | gdb_bfd_ref (struct bfd *abfd) | |
1497 | { | |
1498 | int *p_refcount = bfd_usrdata (abfd); | |
1499 | ||
1500 | if (p_refcount != NULL) | |
1501 | { | |
1502 | *p_refcount += 1; | |
1503 | return abfd; | |
1504 | } | |
1505 | ||
1506 | p_refcount = xmalloc (sizeof (*p_refcount)); | |
1507 | *p_refcount = 1; | |
1508 | bfd_usrdata (abfd) = p_refcount; | |
1509 | ||
1510 | return abfd; | |
1511 | } | |
1512 | ||
1513 | /* Unreference and possibly close ABFD. */ | |
e3c69974 PP |
1514 | void |
1515 | gdb_bfd_unref (struct bfd *abfd) | |
1516 | { | |
1517 | int *p_refcount; | |
1518 | char *name; | |
1519 | ||
1520 | if (abfd == NULL) | |
1521 | return; | |
1522 | ||
4f6f9936 | 1523 | p_refcount = bfd_usrdata (abfd); |
e3c69974 | 1524 | |
3db741ef PP |
1525 | /* Valid range for p_refcount: a pointer to int counter, which has a |
1526 | value of 1 (single owner) or 2 (shared). */ | |
1527 | gdb_assert (*p_refcount == 1 || *p_refcount == 2); | |
1528 | ||
1529 | *p_refcount -= 1; | |
1530 | if (*p_refcount > 0) | |
1531 | return; | |
e3c69974 | 1532 | |
e3c69974 | 1533 | xfree (p_refcount); |
4f6f9936 | 1534 | bfd_usrdata (abfd) = NULL; /* Paranoia. */ |
e3c69974 PP |
1535 | |
1536 | name = bfd_get_filename (abfd); | |
1537 | if (!bfd_close (abfd)) | |
1538 | warning (_("cannot close \"%s\": %s"), | |
1539 | name, bfd_errmsg (bfd_get_error ())); | |
1540 | xfree (name); | |
1541 | } | |
6c95b8df PA |
1542 | |
1543 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
1544 | extern initialize_file_ftype _initialize_objfiles; | |
1545 | ||
1546 | void | |
1547 | _initialize_objfiles (void) | |
1548 | { | |
1549 | objfiles_pspace_data | |
1550 | = register_program_space_data_with_cleanup (objfiles_pspace_data_cleanup); | |
1551 | } |