Commit | Line | Data |
---|---|---|
7cc19214 AC |
1 | /* Get info from stack frames; convert between frames, blocks, |
2 | functions and pc values. | |
3 | ||
6aba47ca | 4 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
4c38e0a4 | 5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, |
7b6bb8da | 6 | 2010, 2011 Free Software Foundation, Inc. |
c906108c | 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 | #include "defs.h" | |
24 | #include "symtab.h" | |
25 | #include "bfd.h" | |
c906108c SS |
26 | #include "objfiles.h" |
27 | #include "frame.h" | |
28 | #include "gdbcore.h" | |
7157eed4 UW |
29 | #include "value.h" |
30 | #include "target.h" | |
31 | #include "inferior.h" | |
c906108c | 32 | #include "annotate.h" |
4e052eda | 33 | #include "regcache.h" |
4f460812 | 34 | #include "gdb_assert.h" |
9c1412c1 | 35 | #include "dummy-frame.h" |
51603483 DJ |
36 | #include "command.h" |
37 | #include "gdbcmd.h" | |
fe898f56 | 38 | #include "block.h" |
edb3359d | 39 | #include "inline-frame.h" |
ccefe4c4 | 40 | #include "psymtab.h" |
c906108c | 41 | |
4a64f543 MS |
42 | /* Return the innermost lexical block in execution in a specified |
43 | stack frame. The frame address is assumed valid. | |
ae767bfb JB |
44 | |
45 | If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code | |
46 | address we used to choose the block. We use this to find a source | |
47 | line, to decide which macro definitions are in scope. | |
48 | ||
49 | The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's | |
50 | PC, and may not really be a valid PC at all. For example, in the | |
51 | caller of a function declared to never return, the code at the | |
52 | return address will never be reached, so the call instruction may | |
53 | be the very last instruction in the block. So the address we use | |
54 | to choose the block is actually one byte before the return address | |
55 | --- hopefully pointing us at the call instruction, or its delay | |
56 | slot instruction. */ | |
c906108c SS |
57 | |
58 | struct block * | |
ae767bfb | 59 | get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block) |
c906108c | 60 | { |
e3eebbd7 | 61 | CORE_ADDR pc; |
edb3359d DJ |
62 | struct block *bl; |
63 | int inline_count; | |
ae767bfb | 64 | |
e3eebbd7 PA |
65 | if (!get_frame_address_in_block_if_available (frame, &pc)) |
66 | return NULL; | |
67 | ||
ae767bfb JB |
68 | if (addr_in_block) |
69 | *addr_in_block = pc; | |
70 | ||
edb3359d DJ |
71 | bl = block_for_pc (pc); |
72 | if (bl == NULL) | |
73 | return NULL; | |
74 | ||
75 | inline_count = frame_inlined_callees (frame); | |
76 | ||
77 | while (inline_count > 0) | |
78 | { | |
79 | if (block_inlined_p (bl)) | |
80 | inline_count--; | |
81 | ||
82 | bl = BLOCK_SUPERBLOCK (bl); | |
83 | gdb_assert (bl != NULL); | |
84 | } | |
85 | ||
86 | return bl; | |
c906108c SS |
87 | } |
88 | ||
c906108c | 89 | CORE_ADDR |
fba45db2 | 90 | get_pc_function_start (CORE_ADDR pc) |
c906108c | 91 | { |
2cdd89cb MK |
92 | struct block *bl; |
93 | struct minimal_symbol *msymbol; | |
c906108c | 94 | |
2cdd89cb MK |
95 | bl = block_for_pc (pc); |
96 | if (bl) | |
c906108c | 97 | { |
7f0df278 | 98 | struct symbol *symbol = block_linkage_function (bl); |
2cdd89cb MK |
99 | |
100 | if (symbol) | |
101 | { | |
102 | bl = SYMBOL_BLOCK_VALUE (symbol); | |
103 | return BLOCK_START (bl); | |
104 | } | |
c906108c | 105 | } |
2cdd89cb MK |
106 | |
107 | msymbol = lookup_minimal_symbol_by_pc (pc); | |
108 | if (msymbol) | |
c906108c | 109 | { |
2cdd89cb MK |
110 | CORE_ADDR fstart = SYMBOL_VALUE_ADDRESS (msymbol); |
111 | ||
112 | if (find_pc_section (fstart)) | |
113 | return fstart; | |
c906108c | 114 | } |
2cdd89cb MK |
115 | |
116 | return 0; | |
c906108c SS |
117 | } |
118 | ||
119 | /* Return the symbol for the function executing in frame FRAME. */ | |
120 | ||
121 | struct symbol * | |
fba45db2 | 122 | get_frame_function (struct frame_info *frame) |
c906108c | 123 | { |
52f0bd74 | 124 | struct block *bl = get_frame_block (frame, 0); |
edb3359d DJ |
125 | |
126 | if (bl == NULL) | |
127 | return NULL; | |
128 | ||
129 | while (BLOCK_FUNCTION (bl) == NULL && BLOCK_SUPERBLOCK (bl) != NULL) | |
130 | bl = BLOCK_SUPERBLOCK (bl); | |
131 | ||
132 | return BLOCK_FUNCTION (bl); | |
c906108c SS |
133 | } |
134 | \f | |
135 | ||
c906108c SS |
136 | /* Return the function containing pc value PC in section SECTION. |
137 | Returns 0 if function is not known. */ | |
138 | ||
139 | struct symbol * | |
714835d5 | 140 | find_pc_sect_function (CORE_ADDR pc, struct obj_section *section) |
c906108c | 141 | { |
52f0bd74 | 142 | struct block *b = block_for_pc_sect (pc, section); |
cc59ec59 | 143 | |
c906108c SS |
144 | if (b == 0) |
145 | return 0; | |
7f0df278 | 146 | return block_linkage_function (b); |
c906108c SS |
147 | } |
148 | ||
149 | /* Return the function containing pc value PC. | |
4a64f543 MS |
150 | Returns 0 if function is not known. |
151 | Backward compatibility, no section */ | |
c906108c SS |
152 | |
153 | struct symbol * | |
fba45db2 | 154 | find_pc_function (CORE_ADDR pc) |
c906108c SS |
155 | { |
156 | return find_pc_sect_function (pc, find_pc_mapped_section (pc)); | |
157 | } | |
158 | ||
159 | /* These variables are used to cache the most recent result | |
4a64f543 | 160 | of find_pc_partial_function. */ |
c906108c | 161 | |
c5aa993b JM |
162 | static CORE_ADDR cache_pc_function_low = 0; |
163 | static CORE_ADDR cache_pc_function_high = 0; | |
164 | static char *cache_pc_function_name = 0; | |
714835d5 | 165 | static struct obj_section *cache_pc_function_section = NULL; |
c906108c | 166 | |
4a64f543 | 167 | /* Clear cache, e.g. when symbol table is discarded. */ |
c906108c SS |
168 | |
169 | void | |
fba45db2 | 170 | clear_pc_function_cache (void) |
c906108c SS |
171 | { |
172 | cache_pc_function_low = 0; | |
173 | cache_pc_function_high = 0; | |
c5aa993b | 174 | cache_pc_function_name = (char *) 0; |
c906108c SS |
175 | cache_pc_function_section = NULL; |
176 | } | |
177 | ||
178 | /* Finds the "function" (text symbol) that is smaller than PC but | |
179 | greatest of all of the potential text symbols in SECTION. Sets | |
180 | *NAME and/or *ADDRESS conditionally if that pointer is non-null. | |
181 | If ENDADDR is non-null, then set *ENDADDR to be the end of the | |
182 | function (exclusive), but passing ENDADDR as non-null means that | |
183 | the function might cause symbols to be read. This function either | |
184 | succeeds or fails (not halfway succeeds). If it succeeds, it sets | |
185 | *NAME, *ADDRESS, and *ENDADDR to real information and returns 1. | |
186 | If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and | |
187 | returns 0. */ | |
188 | ||
73912b9b AC |
189 | /* Backward compatibility, no section argument. */ |
190 | ||
c906108c | 191 | int |
73912b9b AC |
192 | find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address, |
193 | CORE_ADDR *endaddr) | |
c906108c | 194 | { |
714835d5 | 195 | struct obj_section *section; |
c5aa993b | 196 | struct symbol *f; |
c906108c | 197 | struct minimal_symbol *msymbol; |
ccefe4c4 TT |
198 | struct symtab *symtab = NULL; |
199 | struct objfile *objfile; | |
c906108c SS |
200 | int i; |
201 | CORE_ADDR mapped_pc; | |
202 | ||
73912b9b AC |
203 | /* To ensure that the symbol returned belongs to the correct setion |
204 | (and that the last [random] symbol from the previous section | |
205 | isn't returned) try to find the section containing PC. First try | |
206 | the overlay code (which by default returns NULL); and second try | |
207 | the normal section code (which almost always succeeds). */ | |
208 | section = find_pc_overlay (pc); | |
209 | if (section == NULL) | |
714835d5 | 210 | section = find_pc_section (pc); |
73912b9b | 211 | |
c906108c SS |
212 | mapped_pc = overlay_mapped_address (pc, section); |
213 | ||
247055de MK |
214 | if (mapped_pc >= cache_pc_function_low |
215 | && mapped_pc < cache_pc_function_high | |
216 | && section == cache_pc_function_section) | |
c906108c SS |
217 | goto return_cached_value; |
218 | ||
c906108c | 219 | msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section); |
ccefe4c4 TT |
220 | ALL_OBJFILES (objfile) |
221 | { | |
222 | if (objfile->sf) | |
223 | symtab = objfile->sf->qf->find_pc_sect_symtab (objfile, msymbol, | |
224 | mapped_pc, section, 0); | |
225 | if (symtab) | |
226 | break; | |
227 | } | |
228 | ||
229 | if (symtab) | |
c906108c | 230 | { |
ccefe4c4 TT |
231 | /* Checking whether the msymbol has a larger value is for the |
232 | "pathological" case mentioned in print_frame_info. */ | |
233 | f = find_pc_sect_function (mapped_pc, section); | |
234 | if (f != NULL | |
235 | && (msymbol == NULL | |
236 | || (BLOCK_START (SYMBOL_BLOCK_VALUE (f)) | |
237 | >= SYMBOL_VALUE_ADDRESS (msymbol)))) | |
c906108c | 238 | { |
ccefe4c4 TT |
239 | cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f)); |
240 | cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f)); | |
241 | cache_pc_function_name = SYMBOL_LINKAGE_NAME (f); | |
242 | cache_pc_function_section = section; | |
243 | goto return_cached_value; | |
c906108c SS |
244 | } |
245 | } | |
246 | ||
4a64f543 MS |
247 | /* Not in the normal symbol tables, see if the pc is in a known |
248 | section. If it's not, then give up. This ensures that anything | |
249 | beyond the end of the text seg doesn't appear to be part of the | |
250 | last function in the text segment. */ | |
c906108c | 251 | |
714835d5 | 252 | if (!section) |
c906108c SS |
253 | msymbol = NULL; |
254 | ||
255 | /* Must be in the minimal symbol table. */ | |
256 | if (msymbol == NULL) | |
257 | { | |
258 | /* No available symbol. */ | |
259 | if (name != NULL) | |
260 | *name = 0; | |
261 | if (address != NULL) | |
262 | *address = 0; | |
263 | if (endaddr != NULL) | |
264 | *endaddr = 0; | |
265 | return 0; | |
266 | } | |
267 | ||
c5aa993b | 268 | cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol); |
3567439c | 269 | cache_pc_function_name = SYMBOL_LINKAGE_NAME (msymbol); |
c906108c SS |
270 | cache_pc_function_section = section; |
271 | ||
29e8a844 DJ |
272 | /* If the minimal symbol has a size, use it for the cache. |
273 | Otherwise use the lesser of the next minimal symbol in the same | |
274 | section, or the end of the section, as the end of the | |
275 | function. */ | |
c5aa993b | 276 | |
29e8a844 DJ |
277 | if (MSYMBOL_SIZE (msymbol) != 0) |
278 | cache_pc_function_high = cache_pc_function_low + MSYMBOL_SIZE (msymbol); | |
279 | else | |
c906108c | 280 | { |
29e8a844 DJ |
281 | /* Step over other symbols at this same address, and symbols in |
282 | other sections, to find the next symbol in this section with | |
283 | a different address. */ | |
c906108c | 284 | |
3567439c | 285 | for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++) |
29e8a844 | 286 | { |
3e43a32a MS |
287 | if (SYMBOL_VALUE_ADDRESS (msymbol + i) |
288 | != SYMBOL_VALUE_ADDRESS (msymbol) | |
289 | && SYMBOL_OBJ_SECTION (msymbol + i) | |
290 | == SYMBOL_OBJ_SECTION (msymbol)) | |
29e8a844 DJ |
291 | break; |
292 | } | |
293 | ||
3567439c | 294 | if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL |
3e43a32a MS |
295 | && SYMBOL_VALUE_ADDRESS (msymbol + i) |
296 | < obj_section_endaddr (section)) | |
29e8a844 DJ |
297 | cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i); |
298 | else | |
299 | /* We got the start address from the last msymbol in the objfile. | |
300 | So the end address is the end of the section. */ | |
714835d5 | 301 | cache_pc_function_high = obj_section_endaddr (section); |
29e8a844 | 302 | } |
c906108c | 303 | |
247055de | 304 | return_cached_value: |
c906108c SS |
305 | |
306 | if (address) | |
307 | { | |
308 | if (pc_in_unmapped_range (pc, section)) | |
c5aa993b | 309 | *address = overlay_unmapped_address (cache_pc_function_low, section); |
c906108c | 310 | else |
c5aa993b | 311 | *address = cache_pc_function_low; |
c906108c | 312 | } |
c5aa993b | 313 | |
c906108c SS |
314 | if (name) |
315 | *name = cache_pc_function_name; | |
316 | ||
317 | if (endaddr) | |
318 | { | |
319 | if (pc_in_unmapped_range (pc, section)) | |
c5aa993b | 320 | { |
c906108c SS |
321 | /* Because the high address is actually beyond the end of |
322 | the function (and therefore possibly beyond the end of | |
247055de | 323 | the overlay), we must actually convert (high - 1) and |
4a64f543 | 324 | then add one to that. */ |
c906108c | 325 | |
c5aa993b | 326 | *endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1, |
c906108c | 327 | section); |
c5aa993b | 328 | } |
c906108c | 329 | else |
c5aa993b | 330 | *endaddr = cache_pc_function_high; |
c906108c SS |
331 | } |
332 | ||
333 | return 1; | |
334 | } | |
335 | ||
4a64f543 MS |
336 | /* Return the innermost stack frame executing inside of BLOCK, or NULL |
337 | if there is no such frame. If BLOCK is NULL, just return NULL. */ | |
c906108c SS |
338 | |
339 | struct frame_info * | |
fba45db2 | 340 | block_innermost_frame (struct block *block) |
c906108c SS |
341 | { |
342 | struct frame_info *frame; | |
52f0bd74 AC |
343 | CORE_ADDR start; |
344 | CORE_ADDR end; | |
c906108c SS |
345 | |
346 | if (block == NULL) | |
347 | return NULL; | |
348 | ||
349 | start = BLOCK_START (block); | |
350 | end = BLOCK_END (block); | |
351 | ||
631b0ed0 JB |
352 | frame = get_current_frame (); |
353 | while (frame != NULL) | |
c906108c | 354 | { |
edb3359d DJ |
355 | struct block *frame_block = get_frame_block (frame, NULL); |
356 | if (frame_block != NULL && contained_in (frame_block, block)) | |
c906108c | 357 | return frame; |
631b0ed0 JB |
358 | |
359 | frame = get_prev_frame (frame); | |
c906108c | 360 | } |
631b0ed0 JB |
361 | |
362 | return NULL; | |
c906108c | 363 | } |