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4f460812 | 1 | /* Cache and manage frames for GDB, the GNU debugger. |
96cb11df | 2 | |
1d506c26 | 3 | Copyright (C) 1986-2024 Free Software Foundation, Inc. |
d65fe839 AC |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
d65fe839 AC |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
d65fe839 | 19 | |
d55e5aa6 | 20 | #include "frame.h" |
e5dc0d5d | 21 | #include "event-top.h" |
ec452525 | 22 | #include "extract-store-integer.h" |
4de283e4 TT |
23 | #include "target.h" |
24 | #include "value.h" | |
ef0f16cc | 25 | #include "inferior.h" |
4de283e4 TT |
26 | #include "regcache.h" |
27 | #include "user-regs.h" | |
bf31fd38 | 28 | #include "gdbsupport/gdb_obstack.h" |
4de283e4 TT |
29 | #include "dummy-frame.h" |
30 | #include "sentinel-frame.h" | |
d55e5aa6 | 31 | #include "gdbcore.h" |
4de283e4 | 32 | #include "annotate.h" |
d55e5aa6 | 33 | #include "language.h" |
4de283e4 TT |
34 | #include "frame-unwind.h" |
35 | #include "frame-base.h" | |
36 | #include "command.h" | |
37 | #include "gdbcmd.h" | |
d55e5aa6 | 38 | #include "observable.h" |
4de283e4 TT |
39 | #include "objfiles.h" |
40 | #include "gdbthread.h" | |
41 | #include "block.h" | |
42 | #include "inline-frame.h" | |
983dc440 | 43 | #include "tracepoint.h" |
4de283e4 | 44 | #include "hashtab.h" |
f6c01fc5 | 45 | #include "valprint.h" |
d4c16835 | 46 | #include "cli/cli-option.h" |
19b83d5c | 47 | #include "dwarf2/loc.h" |
eb4f72c5 | 48 | |
df433d31 KB |
49 | /* The sentinel frame terminates the innermost end of the frame chain. |
50 | If unwound, it returns the information needed to construct an | |
51 | innermost frame. | |
52 | ||
53 | The current frame, which is the innermost frame, can be found at | |
19f98835 SM |
54 | sentinel_frame->prev. |
55 | ||
56 | This is an optimization to be able to find the sentinel frame quickly, | |
57 | it could otherwise be found in the frame cache. */ | |
df433d31 | 58 | |
bd2b40ac | 59 | static frame_info *sentinel_frame; |
df433d31 | 60 | |
e7bc9db8 PA |
61 | /* Number of calls to reinit_frame_cache. */ |
62 | static unsigned int frame_cache_generation = 0; | |
63 | ||
64 | /* See frame.h. */ | |
65 | ||
66 | unsigned int | |
67 | get_frame_cache_generation () | |
68 | { | |
69 | return frame_cache_generation; | |
70 | } | |
71 | ||
d4c16835 PA |
72 | /* The values behind the global "set backtrace ..." settings. */ |
73 | set_backtrace_options user_set_backtrace_options; | |
74 | ||
8480a37e | 75 | static frame_info_ptr get_prev_frame_raw (const frame_info_ptr &this_frame); |
a7300869 | 76 | static const char *frame_stop_reason_symbol_string (enum unwind_stop_reason reason); |
bc2cbe81 | 77 | static frame_info_ptr create_new_frame (frame_id id); |
5613d8d3 | 78 | |
782d47df PA |
79 | /* Status of some values cached in the frame_info object. */ |
80 | ||
81 | enum cached_copy_status | |
82 | { | |
83 | /* Value is unknown. */ | |
84 | CC_UNKNOWN, | |
85 | ||
86 | /* We have a value. */ | |
87 | CC_VALUE, | |
88 | ||
89 | /* Value was not saved. */ | |
90 | CC_NOT_SAVED, | |
91 | ||
92 | /* Value is unavailable. */ | |
93 | CC_UNAVAILABLE | |
94 | }; | |
95 | ||
d19c3068 SM |
96 | enum class frame_id_status |
97 | { | |
98 | /* Frame id is not computed. */ | |
99 | NOT_COMPUTED = 0, | |
100 | ||
101 | /* Frame id is being computed (compute_frame_id is active). */ | |
102 | COMPUTING, | |
103 | ||
104 | /* Frame id has been computed. */ | |
105 | COMPUTED, | |
106 | }; | |
107 | ||
bd013d54 AC |
108 | /* We keep a cache of stack frames, each of which is a "struct |
109 | frame_info". The innermost one gets allocated (in | |
df433d31 | 110 | wait_for_inferior) each time the inferior stops; sentinel_frame |
bd013d54 AC |
111 | points to it. Additional frames get allocated (in get_prev_frame) |
112 | as needed, and are chained through the next and prev fields. Any | |
113 | time that the frame cache becomes invalid (most notably when we | |
114 | execute something, but also if we change how we interpret the | |
115 | frames (e.g. "set heuristic-fence-post" in mips-tdep.c, or anything | |
116 | which reads new symbols)), we should call reinit_frame_cache. */ | |
117 | ||
118 | struct frame_info | |
119 | { | |
a05a883f SM |
120 | /* Return a string representation of this frame. */ |
121 | std::string to_string () const; | |
122 | ||
bd013d54 AC |
123 | /* Level of this frame. The inner-most (youngest) frame is at level |
124 | 0. As you move towards the outer-most (oldest) frame, the level | |
125 | increases. This is a cached value. It could just as easily be | |
126 | computed by counting back from the selected frame to the inner | |
127 | most frame. */ | |
bbde78fa | 128 | /* NOTE: cagney/2002-04-05: Perhaps a level of ``-1'' should be |
bd013d54 AC |
129 | reserved to indicate a bogus frame - one that has been created |
130 | just to keep GDB happy (GDB always needs a frame). For the | |
131 | moment leave this as speculation. */ | |
132 | int level; | |
133 | ||
6c95b8df PA |
134 | /* The frame's program space. */ |
135 | struct program_space *pspace; | |
136 | ||
137 | /* The frame's address space. */ | |
8b86c959 | 138 | const address_space *aspace; |
6c95b8df | 139 | |
bd013d54 AC |
140 | /* The frame's low-level unwinder and corresponding cache. The |
141 | low-level unwinder is responsible for unwinding register values | |
142 | for the previous frame. The low-level unwind methods are | |
bbde78fa | 143 | selected based on the presence, or otherwise, of register unwind |
bd013d54 AC |
144 | information such as CFI. */ |
145 | void *prologue_cache; | |
146 | const struct frame_unwind *unwind; | |
147 | ||
36f15f55 UW |
148 | /* Cached copy of the previous frame's architecture. */ |
149 | struct | |
150 | { | |
97916bfe | 151 | bool p; |
36f15f55 UW |
152 | struct gdbarch *arch; |
153 | } prev_arch; | |
154 | ||
bd013d54 AC |
155 | /* Cached copy of the previous frame's resume address. */ |
156 | struct { | |
fedfee88 | 157 | cached_copy_status status; |
3d31bc39 AH |
158 | /* Did VALUE require unmasking when being read. */ |
159 | bool masked; | |
bd013d54 AC |
160 | CORE_ADDR value; |
161 | } prev_pc; | |
97916bfe | 162 | |
bd013d54 AC |
163 | /* Cached copy of the previous frame's function address. */ |
164 | struct | |
165 | { | |
166 | CORE_ADDR addr; | |
fedfee88 | 167 | cached_copy_status status; |
bd013d54 | 168 | } prev_func; |
97916bfe | 169 | |
bd013d54 AC |
170 | /* This frame's ID. */ |
171 | struct | |
172 | { | |
d19c3068 | 173 | frame_id_status p; |
bd013d54 AC |
174 | struct frame_id value; |
175 | } this_id; | |
97916bfe | 176 | |
bd013d54 AC |
177 | /* The frame's high-level base methods, and corresponding cache. |
178 | The high level base methods are selected based on the frame's | |
179 | debug info. */ | |
180 | const struct frame_base *base; | |
181 | void *base_cache; | |
182 | ||
183 | /* Pointers to the next (down, inner, younger) and previous (up, | |
184 | outer, older) frame_info's in the frame cache. */ | |
185 | struct frame_info *next; /* down, inner, younger */ | |
97916bfe | 186 | bool prev_p; |
bd013d54 | 187 | struct frame_info *prev; /* up, outer, older */ |
55feb689 DJ |
188 | |
189 | /* The reason why we could not set PREV, or UNWIND_NO_REASON if we | |
190 | could. Only valid when PREV_P is set. */ | |
191 | enum unwind_stop_reason stop_reason; | |
53e8a631 AB |
192 | |
193 | /* A frame specific string describing the STOP_REASON in more detail. | |
194 | Only valid when PREV_P is set, but even then may still be NULL. */ | |
195 | const char *stop_string; | |
bd013d54 AC |
196 | }; |
197 | ||
3d31bc39 AH |
198 | /* See frame.h. */ |
199 | ||
200 | void | |
8480a37e | 201 | set_frame_previous_pc_masked (const frame_info_ptr &frame) |
3d31bc39 AH |
202 | { |
203 | frame->prev_pc.masked = true; | |
204 | } | |
205 | ||
206 | /* See frame.h. */ | |
207 | ||
208 | bool | |
8480a37e | 209 | get_frame_pc_masked (const frame_info_ptr &frame) |
3d31bc39 AH |
210 | { |
211 | gdb_assert (frame->next != nullptr); | |
212 | gdb_assert (frame->next->prev_pc.status == CC_VALUE); | |
213 | ||
214 | return frame->next->prev_pc.masked; | |
215 | } | |
216 | ||
3de661e6 PM |
217 | /* A frame stash used to speed up frame lookups. Create a hash table |
218 | to stash frames previously accessed from the frame cache for | |
219 | quicker subsequent retrieval. The hash table is emptied whenever | |
220 | the frame cache is invalidated. */ | |
b83e9eb7 | 221 | |
3de661e6 | 222 | static htab_t frame_stash; |
b83e9eb7 | 223 | |
3de661e6 PM |
224 | /* Internal function to calculate a hash from the frame_id addresses, |
225 | using as many valid addresses as possible. Frames below level 0 | |
226 | are not stored in the hash table. */ | |
227 | ||
228 | static hashval_t | |
229 | frame_addr_hash (const void *ap) | |
230 | { | |
bd2b40ac | 231 | const frame_info *frame = (const frame_info *) ap; |
3de661e6 PM |
232 | const struct frame_id f_id = frame->this_id.value; |
233 | hashval_t hash = 0; | |
234 | ||
5ce0145d PA |
235 | gdb_assert (f_id.stack_status != FID_STACK_INVALID |
236 | || f_id.code_addr_p | |
3de661e6 PM |
237 | || f_id.special_addr_p); |
238 | ||
5ce0145d | 239 | if (f_id.stack_status == FID_STACK_VALID) |
3de661e6 PM |
240 | hash = iterative_hash (&f_id.stack_addr, |
241 | sizeof (f_id.stack_addr), hash); | |
242 | if (f_id.code_addr_p) | |
243 | hash = iterative_hash (&f_id.code_addr, | |
244 | sizeof (f_id.code_addr), hash); | |
245 | if (f_id.special_addr_p) | |
246 | hash = iterative_hash (&f_id.special_addr, | |
247 | sizeof (f_id.special_addr), hash); | |
248 | ||
f649a718 SM |
249 | char user_created_p = f_id.user_created_p; |
250 | hash = iterative_hash (&user_created_p, sizeof (user_created_p), hash); | |
251 | ||
3de661e6 PM |
252 | return hash; |
253 | } | |
254 | ||
255 | /* Internal equality function for the hash table. This function | |
a0cbd650 | 256 | defers equality operations to frame_id::operator==. */ |
3de661e6 PM |
257 | |
258 | static int | |
259 | frame_addr_hash_eq (const void *a, const void *b) | |
260 | { | |
bd2b40ac TT |
261 | const frame_info *f_entry = (const frame_info *) a; |
262 | const frame_info *f_element = (const frame_info *) b; | |
3de661e6 | 263 | |
a0cbd650 | 264 | return f_entry->this_id.value == f_element->this_id.value; |
3de661e6 PM |
265 | } |
266 | ||
6d3717d4 SM |
267 | /* Deletion function for the frame cache hash table. */ |
268 | ||
269 | static void | |
bc32f8e7 | 270 | frame_info_del (frame_info *frame) |
6d3717d4 | 271 | { |
6d3717d4 SM |
272 | if (frame->prologue_cache != nullptr |
273 | && frame->unwind->dealloc_cache != nullptr) | |
274 | frame->unwind->dealloc_cache (frame, frame->prologue_cache); | |
275 | ||
276 | if (frame->base_cache != nullptr | |
277 | && frame->base->unwind->dealloc_cache != nullptr) | |
278 | frame->base->unwind->dealloc_cache (frame, frame->base_cache); | |
279 | } | |
280 | ||
3de661e6 PM |
281 | /* Internal function to create the frame_stash hash table. 100 seems |
282 | to be a good compromise to start the hash table at. */ | |
283 | ||
284 | static void | |
285 | frame_stash_create (void) | |
286 | { | |
bc32f8e7 SM |
287 | frame_stash = htab_create |
288 | (100, frame_addr_hash, frame_addr_hash_eq, | |
289 | [] (void *p) | |
290 | { | |
291 | auto frame = static_cast<frame_info *> (p); | |
292 | frame_info_del (frame); | |
293 | }); | |
3de661e6 PM |
294 | } |
295 | ||
194cca41 PA |
296 | /* Internal function to add a frame to the frame_stash hash table. |
297 | Returns false if a frame with the same ID was already stashed, true | |
298 | otherwise. */ | |
b83e9eb7 | 299 | |
97916bfe SM |
300 | static bool |
301 | frame_stash_add (frame_info *frame) | |
b83e9eb7 | 302 | { |
19f98835 SM |
303 | /* Valid frame levels are -1 (sentinel frames) and above. */ |
304 | gdb_assert (frame->level >= -1); | |
194cca41 | 305 | |
bd2b40ac TT |
306 | frame_info **slot = (frame_info **) htab_find_slot (frame_stash, |
307 | frame, INSERT); | |
194cca41 PA |
308 | |
309 | /* If we already have a frame in the stack with the same id, we | |
310 | either have a stack cycle (corrupted stack?), or some bug | |
311 | elsewhere in GDB. In any case, ignore the duplicate and return | |
312 | an indication to the caller. */ | |
97916bfe SM |
313 | if (*slot != nullptr) |
314 | return false; | |
194cca41 PA |
315 | |
316 | *slot = frame; | |
97916bfe | 317 | return true; |
b83e9eb7 JB |
318 | } |
319 | ||
3de661e6 PM |
320 | /* Internal function to search the frame stash for an entry with the |
321 | given frame ID. If found, return that frame. Otherwise return | |
322 | NULL. */ | |
b83e9eb7 | 323 | |
9efe17a3 | 324 | static frame_info_ptr |
b83e9eb7 JB |
325 | frame_stash_find (struct frame_id id) |
326 | { | |
3de661e6 | 327 | struct frame_info dummy; |
bd2b40ac | 328 | frame_info *frame; |
b83e9eb7 | 329 | |
3de661e6 | 330 | dummy.this_id.value = id; |
bd2b40ac TT |
331 | frame = (frame_info *) htab_find (frame_stash, &dummy); |
332 | return frame_info_ptr (frame); | |
b83e9eb7 JB |
333 | } |
334 | ||
3de661e6 PM |
335 | /* Internal function to invalidate the frame stash by removing all |
336 | entries in it. This only occurs when the frame cache is | |
337 | invalidated. */ | |
b83e9eb7 JB |
338 | |
339 | static void | |
340 | frame_stash_invalidate (void) | |
341 | { | |
3de661e6 | 342 | htab_empty (frame_stash); |
b83e9eb7 JB |
343 | } |
344 | ||
45f25d6c AB |
345 | /* See frame.h */ |
346 | scoped_restore_selected_frame::scoped_restore_selected_frame () | |
347 | { | |
79952e69 PA |
348 | m_lang = current_language->la_language; |
349 | save_selected_frame (&m_fid, &m_level); | |
45f25d6c AB |
350 | } |
351 | ||
352 | /* See frame.h */ | |
353 | scoped_restore_selected_frame::~scoped_restore_selected_frame () | |
354 | { | |
79952e69 PA |
355 | restore_selected_frame (m_fid, m_level); |
356 | set_language (m_lang); | |
45f25d6c AB |
357 | } |
358 | ||
ac2bd0a9 AC |
359 | /* Flag to control debugging. */ |
360 | ||
dd4f75f2 SM |
361 | bool frame_debug; |
362 | ||
920d2a44 AC |
363 | static void |
364 | show_frame_debug (struct ui_file *file, int from_tty, | |
365 | struct cmd_list_element *c, const char *value) | |
366 | { | |
6cb06a8c | 367 | gdb_printf (file, _("Frame debugging is %s.\n"), value); |
920d2a44 | 368 | } |
ac2bd0a9 | 369 | |
d4c16835 | 370 | /* Implementation of "show backtrace past-main". */ |
25d29d70 | 371 | |
920d2a44 AC |
372 | static void |
373 | show_backtrace_past_main (struct ui_file *file, int from_tty, | |
374 | struct cmd_list_element *c, const char *value) | |
375 | { | |
6cb06a8c TT |
376 | gdb_printf (file, |
377 | _("Whether backtraces should " | |
378 | "continue past \"main\" is %s.\n"), | |
379 | value); | |
920d2a44 AC |
380 | } |
381 | ||
d4c16835 PA |
382 | /* Implementation of "show backtrace past-entry". */ |
383 | ||
920d2a44 AC |
384 | static void |
385 | show_backtrace_past_entry (struct ui_file *file, int from_tty, | |
386 | struct cmd_list_element *c, const char *value) | |
387 | { | |
6cb06a8c TT |
388 | gdb_printf (file, _("Whether backtraces should continue past the " |
389 | "entry point of a program is %s.\n"), | |
390 | value); | |
920d2a44 AC |
391 | } |
392 | ||
d4c16835 PA |
393 | /* Implementation of "show backtrace limit". */ |
394 | ||
920d2a44 AC |
395 | static void |
396 | show_backtrace_limit (struct ui_file *file, int from_tty, | |
397 | struct cmd_list_element *c, const char *value) | |
398 | { | |
6cb06a8c TT |
399 | gdb_printf (file, |
400 | _("An upper bound on the number " | |
401 | "of backtrace levels is %s.\n"), | |
402 | value); | |
920d2a44 AC |
403 | } |
404 | ||
927c4e35 | 405 | /* See frame.h. */ |
eb4f72c5 | 406 | |
927c4e35 AB |
407 | std::string |
408 | frame_id::to_string () const | |
ca73dd9d | 409 | { |
927c4e35 | 410 | const struct frame_id &id = *this; |
d65fe839 | 411 | |
927c4e35 | 412 | std::string res = "{"; |
5ce0145d PA |
413 | |
414 | if (id.stack_status == FID_STACK_INVALID) | |
927c4e35 | 415 | res += "!stack"; |
5ce0145d | 416 | else if (id.stack_status == FID_STACK_UNAVAILABLE) |
927c4e35 | 417 | res += "stack=<unavailable>"; |
df433d31 | 418 | else if (id.stack_status == FID_STACK_SENTINEL) |
927c4e35 | 419 | res += "stack=<sentinel>"; |
84154d16 | 420 | else if (id.stack_status == FID_STACK_OUTER) |
927c4e35 | 421 | res += "stack=<outer>"; |
5ce0145d | 422 | else |
927c4e35 | 423 | res += std::string ("stack=") + hex_string (id.stack_addr); |
84154d16 | 424 | |
927c4e35 AB |
425 | /* Helper function to format 'N=A' if P is true, otherwise '!N'. */ |
426 | auto field_to_string = [] (const char *n, bool p, CORE_ADDR a) -> std::string | |
427 | { | |
428 | if (p) | |
429 | return std::string (n) + "=" + core_addr_to_string (a); | |
430 | else | |
431 | return std::string ("!") + std::string (n); | |
432 | }; | |
5ce0145d | 433 | |
927c4e35 AB |
434 | res += (std::string (",") |
435 | + field_to_string ("code", id.code_addr_p, id.code_addr) | |
436 | + std::string (",") | |
437 | + field_to_string ("special", id.special_addr_p, id.special_addr)); | |
5ce0145d | 438 | |
193facb3 | 439 | if (id.artificial_depth) |
927c4e35 AB |
440 | res += ",artificial=" + std::to_string (id.artificial_depth); |
441 | res += "}"; | |
442 | return res; | |
7f78e237 AC |
443 | } |
444 | ||
be016879 | 445 | /* See frame.h. */ |
a05a883f | 446 | |
be016879 | 447 | const char * |
a05a883f | 448 | frame_type_str (frame_type type) |
7f78e237 AC |
449 | { |
450 | switch (type) | |
451 | { | |
7f78e237 | 452 | case NORMAL_FRAME: |
a05a883f SM |
453 | return "NORMAL_FRAME"; |
454 | ||
7f78e237 | 455 | case DUMMY_FRAME: |
a05a883f SM |
456 | return "DUMMY_FRAME"; |
457 | ||
edb3359d | 458 | case INLINE_FRAME: |
a05a883f SM |
459 | return "INLINE_FRAME"; |
460 | ||
b5eef7aa | 461 | case TAILCALL_FRAME: |
a05a883f SM |
462 | return "TAILCALL_FRAME"; |
463 | ||
7f78e237 | 464 | case SIGTRAMP_FRAME: |
a05a883f SM |
465 | return "SIGTRAMP_FRAME"; |
466 | ||
36f15f55 | 467 | case ARCH_FRAME: |
a05a883f SM |
468 | return "ARCH_FRAME"; |
469 | ||
b5eef7aa | 470 | case SENTINEL_FRAME: |
a05a883f SM |
471 | return "SENTINEL_FRAME"; |
472 | ||
7f78e237 | 473 | default: |
a05a883f | 474 | return "<unknown type>"; |
7f78e237 AC |
475 | }; |
476 | } | |
477 | ||
a05a883f SM |
478 | /* See struct frame_info. */ |
479 | ||
480 | std::string | |
481 | frame_info::to_string () const | |
7f78e237 | 482 | { |
a05a883f | 483 | const frame_info *fi = this; |
d19c3068 | 484 | |
a05a883f SM |
485 | std::string res; |
486 | ||
487 | res += string_printf ("{level=%d,", fi->level); | |
d19c3068 | 488 | |
c1bf6f65 | 489 | if (fi->unwind != NULL) |
a05a883f | 490 | res += string_printf ("type=%s,", frame_type_str (fi->unwind->type)); |
c1bf6f65 | 491 | else |
a05a883f | 492 | res += "type=<unknown>,"; |
d19c3068 | 493 | |
7f78e237 | 494 | if (fi->unwind != NULL) |
8085fa01 | 495 | res += string_printf ("unwinder=\"%s\",", fi->unwind->name); |
7f78e237 | 496 | else |
8085fa01 | 497 | res += "unwinder=<unknown>,"; |
d19c3068 | 498 | |
782d47df | 499 | if (fi->next == NULL || fi->next->prev_pc.status == CC_UNKNOWN) |
a05a883f | 500 | res += "pc=<unknown>,"; |
782d47df | 501 | else if (fi->next->prev_pc.status == CC_VALUE) |
a05a883f SM |
502 | res += string_printf ("pc=%s%s,", hex_string (fi->next->prev_pc.value), |
503 | fi->next->prev_pc.masked ? "[PAC]" : ""); | |
782d47df | 504 | else if (fi->next->prev_pc.status == CC_NOT_SAVED) |
a05a883f | 505 | res += "pc=<not saved>,"; |
782d47df | 506 | else if (fi->next->prev_pc.status == CC_UNAVAILABLE) |
a05a883f | 507 | res += "pc=<unavailable>,"; |
d19c3068 | 508 | |
d19c3068 | 509 | if (fi->this_id.p == frame_id_status::NOT_COMPUTED) |
a05a883f | 510 | res += "id=<not computed>,"; |
d19c3068 | 511 | else if (fi->this_id.p == frame_id_status::COMPUTING) |
a05a883f | 512 | res += "id=<computing>,"; |
7f78e237 | 513 | else |
a05a883f | 514 | res += string_printf ("id=%s,", fi->this_id.value.to_string ().c_str ()); |
d19c3068 | 515 | |
fedfee88 | 516 | if (fi->next != NULL && fi->next->prev_func.status == CC_VALUE) |
a05a883f | 517 | res += string_printf ("func=%s", hex_string (fi->next->prev_func.addr)); |
7f78e237 | 518 | else |
a05a883f SM |
519 | res += "func=<unknown>"; |
520 | ||
521 | res += "}"; | |
522 | ||
523 | return res; | |
7f78e237 AC |
524 | } |
525 | ||
193facb3 JK |
526 | /* Given FRAME, return the enclosing frame as found in real frames read-in from |
527 | inferior memory. Skip any previous frames which were made up by GDB. | |
33b4777c MM |
528 | Return FRAME if FRAME is a non-artificial frame. |
529 | Return NULL if FRAME is the start of an artificial-only chain. */ | |
edb3359d | 530 | |
9efe17a3 | 531 | static frame_info_ptr |
8480a37e | 532 | skip_artificial_frames (const frame_info_ptr &initial_frame) |
edb3359d | 533 | { |
51d48146 PA |
534 | /* Note we use get_prev_frame_always, and not get_prev_frame. The |
535 | latter will truncate the frame chain, leading to this function | |
536 | unintentionally returning a null_frame_id (e.g., when the user | |
33b4777c MM |
537 | sets a backtrace limit). |
538 | ||
539 | Note that for record targets we may get a frame chain that consists | |
540 | of artificial frames only. */ | |
8480a37e | 541 | frame_info_ptr frame = initial_frame; |
1ab3b62c JK |
542 | while (get_frame_type (frame) == INLINE_FRAME |
543 | || get_frame_type (frame) == TAILCALL_FRAME) | |
33b4777c MM |
544 | { |
545 | frame = get_prev_frame_always (frame); | |
546 | if (frame == NULL) | |
547 | break; | |
548 | } | |
edb3359d DJ |
549 | |
550 | return frame; | |
551 | } | |
552 | ||
9efe17a3 | 553 | frame_info_ptr |
8480a37e | 554 | skip_unwritable_frames (const frame_info_ptr &initial_frame) |
7eb89530 | 555 | { |
8480a37e | 556 | frame_info_ptr frame = initial_frame; |
7eb89530 YQ |
557 | while (gdbarch_code_of_frame_writable (get_frame_arch (frame), frame) == 0) |
558 | { | |
559 | frame = get_prev_frame (frame); | |
560 | if (frame == NULL) | |
561 | break; | |
562 | } | |
563 | ||
564 | return frame; | |
565 | } | |
566 | ||
2f3ef606 MM |
567 | /* See frame.h. */ |
568 | ||
9efe17a3 | 569 | frame_info_ptr |
8480a37e | 570 | skip_tailcall_frames (const frame_info_ptr &initial_frame) |
2f3ef606 | 571 | { |
8480a37e | 572 | frame_info_ptr frame = initial_frame; |
2f3ef606 | 573 | while (get_frame_type (frame) == TAILCALL_FRAME) |
33b4777c MM |
574 | { |
575 | /* Note that for record targets we may get a frame chain that consists of | |
576 | tailcall frames only. */ | |
577 | frame = get_prev_frame (frame); | |
578 | if (frame == NULL) | |
579 | break; | |
580 | } | |
2f3ef606 MM |
581 | |
582 | return frame; | |
583 | } | |
584 | ||
194cca41 PA |
585 | /* Compute the frame's uniq ID that can be used to, later, re-find the |
586 | frame. */ | |
587 | ||
588 | static void | |
8480a37e | 589 | compute_frame_id (const frame_info_ptr &fi) |
194cca41 | 590 | { |
fe67a58f SM |
591 | FRAME_SCOPED_DEBUG_ENTER_EXIT; |
592 | ||
d19c3068 | 593 | gdb_assert (fi->this_id.p == frame_id_status::NOT_COMPUTED); |
194cca41 | 594 | |
d19c3068 SM |
595 | unsigned int entry_generation = get_frame_cache_generation (); |
596 | ||
597 | try | |
194cca41 | 598 | { |
d19c3068 SM |
599 | /* Mark this frame's id as "being computed. */ |
600 | fi->this_id.p = frame_id_status::COMPUTING; | |
601 | ||
a05a883f | 602 | frame_debug_printf ("fi=%d", fi->level); |
d19c3068 SM |
603 | |
604 | /* Find the unwinder. */ | |
605 | if (fi->unwind == NULL) | |
606 | frame_unwind_find_by_frame (fi, &fi->prologue_cache); | |
607 | ||
608 | /* Find THIS frame's ID. */ | |
609 | /* Default to outermost if no ID is found. */ | |
610 | fi->this_id.value = outer_frame_id; | |
611 | fi->unwind->this_id (fi, &fi->prologue_cache, &fi->this_id.value); | |
612 | gdb_assert (frame_id_p (fi->this_id.value)); | |
613 | ||
614 | /* Mark this frame's id as "computed". */ | |
615 | fi->this_id.p = frame_id_status::COMPUTED; | |
616 | ||
a05a883f | 617 | frame_debug_printf (" -> %s", fi->this_id.value.to_string ().c_str ()); |
d19c3068 SM |
618 | } |
619 | catch (const gdb_exception &ex) | |
620 | { | |
621 | /* On error, revert the frame id status to not computed. If the frame | |
dda83cd7 | 622 | cache generation changed, the frame object doesn't exist anymore, so |
d19c3068 SM |
623 | don't touch it. */ |
624 | if (get_frame_cache_generation () == entry_generation) | |
625 | fi->this_id.p = frame_id_status::NOT_COMPUTED; | |
626 | ||
627 | throw; | |
194cca41 PA |
628 | } |
629 | } | |
630 | ||
7a424e99 | 631 | /* Return a frame uniq ID that can be used to, later, re-find the |
101dcfbe AC |
632 | frame. */ |
633 | ||
7a424e99 | 634 | struct frame_id |
8480a37e | 635 | get_frame_id (const frame_info_ptr &fi) |
101dcfbe AC |
636 | { |
637 | if (fi == NULL) | |
b83e9eb7 JB |
638 | return null_frame_id; |
639 | ||
d19c3068 SM |
640 | /* It's always invalid to try to get a frame's id while it is being |
641 | computed. */ | |
642 | gdb_assert (fi->this_id.p != frame_id_status::COMPUTING); | |
643 | ||
644 | if (fi->this_id.p == frame_id_status::NOT_COMPUTED) | |
f245535c | 645 | { |
f245535c PA |
646 | /* If we haven't computed the frame id yet, then it must be that |
647 | this is the current frame. Compute it now, and stash the | |
648 | result. The IDs of other frames are computed as soon as | |
649 | they're created, in order to detect cycles. See | |
650 | get_prev_frame_if_no_cycle. */ | |
651 | gdb_assert (fi->level == 0); | |
652 | ||
653 | /* Compute. */ | |
654 | compute_frame_id (fi); | |
655 | ||
656 | /* Since this is the first frame in the chain, this should | |
657 | always succeed. */ | |
bd2b40ac | 658 | bool stashed = frame_stash_add (fi.get ()); |
f245535c PA |
659 | gdb_assert (stashed); |
660 | } | |
661 | ||
18adea3f | 662 | return fi->this_id.value; |
101dcfbe AC |
663 | } |
664 | ||
edb3359d | 665 | struct frame_id |
8480a37e | 666 | get_stack_frame_id (const frame_info_ptr &next_frame) |
edb3359d | 667 | { |
193facb3 | 668 | return get_frame_id (skip_artificial_frames (next_frame)); |
edb3359d DJ |
669 | } |
670 | ||
5613d8d3 | 671 | struct frame_id |
8480a37e | 672 | frame_unwind_caller_id (const frame_info_ptr &initial_next_frame) |
5613d8d3 | 673 | { |
51d48146 PA |
674 | /* Use get_prev_frame_always, and not get_prev_frame. The latter |
675 | will truncate the frame chain, leading to this function | |
676 | unintentionally returning a null_frame_id (e.g., when a caller | |
677 | requests the frame ID of "main()"s caller. */ | |
edb3359d | 678 | |
8480a37e | 679 | frame_info_ptr next_frame = skip_artificial_frames (initial_next_frame); |
33b4777c MM |
680 | if (next_frame == NULL) |
681 | return null_frame_id; | |
682 | ||
8480a37e | 683 | frame_info_ptr this_frame = get_prev_frame_always (next_frame); |
edb3359d | 684 | if (this_frame) |
193facb3 | 685 | return get_frame_id (skip_artificial_frames (this_frame)); |
edb3359d DJ |
686 | else |
687 | return null_frame_id; | |
5613d8d3 AC |
688 | } |
689 | ||
f8904751 | 690 | const struct frame_id null_frame_id = { 0 }; /* All zeros. */ |
84154d16 | 691 | const struct frame_id outer_frame_id = { 0, 0, 0, FID_STACK_OUTER, 0, 1, 0 }; |
7a424e99 AC |
692 | |
693 | struct frame_id | |
48c66725 | 694 | frame_id_build_special (CORE_ADDR stack_addr, CORE_ADDR code_addr, |
dda83cd7 | 695 | CORE_ADDR special_addr) |
7a424e99 | 696 | { |
12b0b6de | 697 | struct frame_id id = null_frame_id; |
1c4d3f96 | 698 | |
d0a55772 | 699 | id.stack_addr = stack_addr; |
5ce0145d | 700 | id.stack_status = FID_STACK_VALID; |
d0a55772 | 701 | id.code_addr = code_addr; |
97916bfe | 702 | id.code_addr_p = true; |
48c66725 | 703 | id.special_addr = special_addr; |
97916bfe | 704 | id.special_addr_p = true; |
7a424e99 AC |
705 | return id; |
706 | } | |
707 | ||
5ce0145d PA |
708 | /* See frame.h. */ |
709 | ||
710 | struct frame_id | |
711 | frame_id_build_unavailable_stack (CORE_ADDR code_addr) | |
712 | { | |
713 | struct frame_id id = null_frame_id; | |
714 | ||
715 | id.stack_status = FID_STACK_UNAVAILABLE; | |
716 | id.code_addr = code_addr; | |
97916bfe | 717 | id.code_addr_p = true; |
5ce0145d PA |
718 | return id; |
719 | } | |
720 | ||
8372a7cb MM |
721 | /* See frame.h. */ |
722 | ||
723 | struct frame_id | |
724 | frame_id_build_unavailable_stack_special (CORE_ADDR code_addr, | |
725 | CORE_ADDR special_addr) | |
726 | { | |
727 | struct frame_id id = null_frame_id; | |
728 | ||
729 | id.stack_status = FID_STACK_UNAVAILABLE; | |
730 | id.code_addr = code_addr; | |
97916bfe | 731 | id.code_addr_p = true; |
8372a7cb | 732 | id.special_addr = special_addr; |
97916bfe | 733 | id.special_addr_p = true; |
8372a7cb MM |
734 | return id; |
735 | } | |
736 | ||
48c66725 JJ |
737 | struct frame_id |
738 | frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr) | |
739 | { | |
12b0b6de | 740 | struct frame_id id = null_frame_id; |
1c4d3f96 | 741 | |
12b0b6de | 742 | id.stack_addr = stack_addr; |
5ce0145d | 743 | id.stack_status = FID_STACK_VALID; |
12b0b6de | 744 | id.code_addr = code_addr; |
97916bfe | 745 | id.code_addr_p = true; |
12b0b6de UW |
746 | return id; |
747 | } | |
748 | ||
749 | struct frame_id | |
750 | frame_id_build_wild (CORE_ADDR stack_addr) | |
751 | { | |
752 | struct frame_id id = null_frame_id; | |
1c4d3f96 | 753 | |
12b0b6de | 754 | id.stack_addr = stack_addr; |
5ce0145d | 755 | id.stack_status = FID_STACK_VALID; |
12b0b6de | 756 | return id; |
48c66725 JJ |
757 | } |
758 | ||
19f98835 SM |
759 | /* See frame.h. */ |
760 | ||
761 | frame_id | |
762 | frame_id_build_sentinel (CORE_ADDR stack_addr, CORE_ADDR code_addr) | |
763 | { | |
764 | frame_id id = null_frame_id; | |
765 | ||
766 | id.stack_status = FID_STACK_SENTINEL; | |
767 | id.special_addr_p = 1; | |
768 | ||
769 | if (stack_addr != 0 || code_addr != 0) | |
770 | { | |
771 | /* The purpose of saving these in the sentinel frame ID is to be able to | |
772 | differentiate the IDs of several sentinel frames that could exist | |
773 | simultaneously in the frame cache. */ | |
774 | id.stack_addr = stack_addr; | |
775 | id.code_addr = code_addr; | |
776 | id.code_addr_p = 1; | |
777 | } | |
778 | ||
779 | return id; | |
780 | } | |
781 | ||
97916bfe SM |
782 | bool |
783 | frame_id_p (frame_id l) | |
7a424e99 | 784 | { |
12b0b6de | 785 | /* The frame is valid iff it has a valid stack address. */ |
97916bfe SM |
786 | bool p = l.stack_status != FID_STACK_INVALID; |
787 | ||
a05a883f | 788 | frame_debug_printf ("l=%s -> %d", l.to_string ().c_str (), p); |
97916bfe | 789 | |
d0a55772 | 790 | return p; |
7a424e99 AC |
791 | } |
792 | ||
97916bfe SM |
793 | bool |
794 | frame_id_artificial_p (frame_id l) | |
edb3359d DJ |
795 | { |
796 | if (!frame_id_p (l)) | |
97916bfe | 797 | return false; |
edb3359d | 798 | |
97916bfe | 799 | return l.artificial_depth != 0; |
edb3359d DJ |
800 | } |
801 | ||
97916bfe | 802 | bool |
a0cbd650 | 803 | frame_id::operator== (const frame_id &r) const |
7a424e99 | 804 | { |
97916bfe | 805 | bool eq; |
1c4d3f96 | 806 | |
a0cbd650 | 807 | if (stack_status == FID_STACK_INVALID |
f3bd50f1 | 808 | || r.stack_status == FID_STACK_INVALID) |
12b0b6de UW |
809 | /* Like a NaN, if either ID is invalid, the result is false. |
810 | Note that a frame ID is invalid iff it is the null frame ID. */ | |
97916bfe | 811 | eq = false; |
a0cbd650 | 812 | else if (stack_status != r.stack_status || stack_addr != r.stack_addr) |
d0a55772 | 813 | /* If .stack addresses are different, the frames are different. */ |
97916bfe | 814 | eq = false; |
a0cbd650 | 815 | else if (code_addr_p && r.code_addr_p && code_addr != r.code_addr) |
edb3359d DJ |
816 | /* An invalid code addr is a wild card. If .code addresses are |
817 | different, the frames are different. */ | |
97916bfe | 818 | eq = false; |
a0cbd650 TT |
819 | else if (special_addr_p && r.special_addr_p |
820 | && special_addr != r.special_addr) | |
edb3359d DJ |
821 | /* An invalid special addr is a wild card (or unused). Otherwise |
822 | if special addresses are different, the frames are different. */ | |
97916bfe | 823 | eq = false; |
a0cbd650 | 824 | else if (artificial_depth != r.artificial_depth) |
85102364 | 825 | /* If artificial depths are different, the frames must be different. */ |
97916bfe | 826 | eq = false; |
f649a718 SM |
827 | else if (user_created_p != r.user_created_p) |
828 | eq = false; | |
edb3359d | 829 | else |
48c66725 | 830 | /* Frames are equal. */ |
97916bfe | 831 | eq = true; |
edb3359d | 832 | |
a05a883f | 833 | frame_debug_printf ("l=%s, r=%s -> %d", |
a0cbd650 | 834 | to_string ().c_str (), r.to_string ().c_str (), eq); |
97916bfe | 835 | |
d0a55772 | 836 | return eq; |
7a424e99 AC |
837 | } |
838 | ||
a45ae3ed UW |
839 | /* Safety net to check whether frame ID L should be inner to |
840 | frame ID R, according to their stack addresses. | |
841 | ||
842 | This method cannot be used to compare arbitrary frames, as the | |
843 | ranges of valid stack addresses may be discontiguous (e.g. due | |
844 | to sigaltstack). | |
845 | ||
846 | However, it can be used as safety net to discover invalid frame | |
0963b4bd | 847 | IDs in certain circumstances. Assuming that NEXT is the immediate |
f06eadd9 | 848 | inner frame to THIS and that NEXT and THIS are both NORMAL frames: |
a45ae3ed | 849 | |
f06eadd9 JB |
850 | * The stack address of NEXT must be inner-than-or-equal to the stack |
851 | address of THIS. | |
a45ae3ed UW |
852 | |
853 | Therefore, if frame_id_inner (THIS, NEXT) holds, some unwind | |
854 | error has occurred. | |
855 | ||
f06eadd9 JB |
856 | * If NEXT and THIS have different stack addresses, no other frame |
857 | in the frame chain may have a stack address in between. | |
a45ae3ed UW |
858 | |
859 | Therefore, if frame_id_inner (TEST, THIS) holds, but | |
860 | frame_id_inner (TEST, NEXT) does not hold, TEST cannot refer | |
f06eadd9 JB |
861 | to a valid frame in the frame chain. |
862 | ||
863 | The sanity checks above cannot be performed when a SIGTRAMP frame | |
864 | is involved, because signal handlers might be executed on a different | |
865 | stack than the stack used by the routine that caused the signal | |
866 | to be raised. This can happen for instance when a thread exceeds | |
0963b4bd | 867 | its maximum stack size. In this case, certain compilers implement |
f06eadd9 JB |
868 | a stack overflow strategy that cause the handler to be run on a |
869 | different stack. */ | |
a45ae3ed | 870 | |
97916bfe | 871 | static bool |
09a7aba8 | 872 | frame_id_inner (struct gdbarch *gdbarch, struct frame_id l, struct frame_id r) |
7a424e99 | 873 | { |
97916bfe | 874 | bool inner; |
1c4d3f96 | 875 | |
5ce0145d PA |
876 | if (l.stack_status != FID_STACK_VALID || r.stack_status != FID_STACK_VALID) |
877 | /* Like NaN, any operation involving an invalid ID always fails. | |
878 | Likewise if either ID has an unavailable stack address. */ | |
97916bfe | 879 | inner = false; |
193facb3 | 880 | else if (l.artificial_depth > r.artificial_depth |
edb3359d DJ |
881 | && l.stack_addr == r.stack_addr |
882 | && l.code_addr_p == r.code_addr_p | |
883 | && l.special_addr_p == r.special_addr_p | |
884 | && l.special_addr == r.special_addr) | |
885 | { | |
886 | /* Same function, different inlined functions. */ | |
3977b71f | 887 | const struct block *lb, *rb; |
edb3359d DJ |
888 | |
889 | gdb_assert (l.code_addr_p && r.code_addr_p); | |
890 | ||
891 | lb = block_for_pc (l.code_addr); | |
892 | rb = block_for_pc (r.code_addr); | |
893 | ||
894 | if (lb == NULL || rb == NULL) | |
895 | /* Something's gone wrong. */ | |
97916bfe | 896 | inner = false; |
edb3359d DJ |
897 | else |
898 | /* This will return true if LB and RB are the same block, or | |
899 | if the block with the smaller depth lexically encloses the | |
900 | block with the greater depth. */ | |
0d191295 | 901 | inner = rb->contains (lb); |
edb3359d | 902 | } |
d0a55772 AC |
903 | else |
904 | /* Only return non-zero when strictly inner than. Note that, per | |
905 | comment in "frame.h", there is some fuzz here. Frameless | |
906 | functions are not strictly inner than (same .stack but | |
48c66725 | 907 | different .code and/or .special address). */ |
09a7aba8 | 908 | inner = gdbarch_inner_than (gdbarch, l.stack_addr, r.stack_addr); |
97916bfe | 909 | |
a05a883f SM |
910 | frame_debug_printf ("is l=%s inner than r=%s? %d", |
911 | l.to_string ().c_str (), r.to_string ().c_str (), | |
912 | inner); | |
97916bfe | 913 | |
d0a55772 | 914 | return inner; |
7a424e99 AC |
915 | } |
916 | ||
9efe17a3 | 917 | frame_info_ptr |
101dcfbe AC |
918 | frame_find_by_id (struct frame_id id) |
919 | { | |
bd2b40ac | 920 | frame_info_ptr frame, prev_frame; |
101dcfbe AC |
921 | |
922 | /* ZERO denotes the null frame, let the caller decide what to do | |
923 | about it. Should it instead return get_current_frame()? */ | |
7a424e99 | 924 | if (!frame_id_p (id)) |
101dcfbe AC |
925 | return NULL; |
926 | ||
df433d31 | 927 | /* Check for the sentinel frame. */ |
19f98835 | 928 | if (id == frame_id_build_sentinel (0, 0)) |
bd2b40ac | 929 | return frame_info_ptr (sentinel_frame); |
df433d31 | 930 | |
b83e9eb7 JB |
931 | /* Try using the frame stash first. Finding it there removes the need |
932 | to perform the search by looping over all frames, which can be very | |
933 | CPU-intensive if the number of frames is very high (the loop is O(n) | |
934 | and get_prev_frame performs a series of checks that are relatively | |
935 | expensive). This optimization is particularly useful when this function | |
936 | is called from another function (such as value_fetch_lazy, case | |
736355f2 | 937 | val->lval () == lval_register) which already loops over all frames, |
b83e9eb7 JB |
938 | making the overall behavior O(n^2). */ |
939 | frame = frame_stash_find (id); | |
940 | if (frame) | |
941 | return frame; | |
942 | ||
a45ae3ed | 943 | for (frame = get_current_frame (); ; frame = prev_frame) |
101dcfbe | 944 | { |
fe978cb0 | 945 | struct frame_id self = get_frame_id (frame); |
bb9bcb69 | 946 | |
a0cbd650 | 947 | if (id == self) |
7a424e99 AC |
948 | /* An exact match. */ |
949 | return frame; | |
a45ae3ed UW |
950 | |
951 | prev_frame = get_prev_frame (frame); | |
952 | if (!prev_frame) | |
953 | return NULL; | |
954 | ||
955 | /* As a safety net to avoid unnecessary backtracing while trying | |
956 | to find an invalid ID, we check for a common situation where | |
957 | we can detect from comparing stack addresses that no other | |
958 | frame in the current frame chain can have this ID. See the | |
959 | comment at frame_id_inner for details. */ | |
960 | if (get_frame_type (frame) == NORMAL_FRAME | |
fe978cb0 | 961 | && !frame_id_inner (get_frame_arch (frame), id, self) |
a45ae3ed UW |
962 | && frame_id_inner (get_frame_arch (prev_frame), id, |
963 | get_frame_id (prev_frame))) | |
101dcfbe | 964 | return NULL; |
101dcfbe AC |
965 | } |
966 | return NULL; | |
967 | } | |
968 | ||
782d47df | 969 | static CORE_ADDR |
8480a37e | 970 | frame_unwind_pc (const frame_info_ptr &this_frame) |
f18c5a73 | 971 | { |
782d47df | 972 | if (this_frame->prev_pc.status == CC_UNKNOWN) |
f18c5a73 | 973 | { |
8bcb5208 AB |
974 | struct gdbarch *prev_gdbarch; |
975 | CORE_ADDR pc = 0; | |
97916bfe | 976 | bool pc_p = false; |
8bcb5208 AB |
977 | |
978 | /* The right way. The `pure' way. The one true way. This | |
979 | method depends solely on the register-unwind code to | |
980 | determine the value of registers in THIS frame, and hence | |
981 | the value of this frame's PC (resume address). A typical | |
982 | implementation is no more than: | |
983 | ||
984 | frame_unwind_register (this_frame, ISA_PC_REGNUM, buf); | |
985 | return extract_unsigned_integer (buf, size of ISA_PC_REGNUM); | |
986 | ||
987 | Note: this method is very heavily dependent on a correct | |
988 | register-unwind implementation, it pays to fix that | |
989 | method first; this method is frame type agnostic, since | |
990 | it only deals with register values, it works with any | |
991 | frame. This is all in stark contrast to the old | |
992 | FRAME_SAVED_PC which would try to directly handle all the | |
993 | different ways that a PC could be unwound. */ | |
994 | prev_gdbarch = frame_unwind_arch (this_frame); | |
995 | ||
a70b8144 | 996 | try |
12cc2063 | 997 | { |
8bcb5208 | 998 | pc = gdbarch_unwind_pc (prev_gdbarch, this_frame); |
97916bfe | 999 | pc_p = true; |
8bcb5208 | 1000 | } |
230d2906 | 1001 | catch (const gdb_exception_error &ex) |
8bcb5208 AB |
1002 | { |
1003 | if (ex.error == NOT_AVAILABLE_ERROR) | |
e3eebbd7 | 1004 | { |
8bcb5208 AB |
1005 | this_frame->prev_pc.status = CC_UNAVAILABLE; |
1006 | ||
a05a883f SM |
1007 | frame_debug_printf ("this_frame=%d -> <unavailable>", |
1008 | this_frame->level); | |
e3eebbd7 | 1009 | } |
8bcb5208 | 1010 | else if (ex.error == OPTIMIZED_OUT_ERROR) |
e3eebbd7 | 1011 | { |
8bcb5208 | 1012 | this_frame->prev_pc.status = CC_NOT_SAVED; |
492d29ea | 1013 | |
a05a883f SM |
1014 | frame_debug_printf ("this_frame=%d -> <not saved>", |
1015 | this_frame->level); | |
e3eebbd7 | 1016 | } |
8bcb5208 | 1017 | else |
eedc3f4f | 1018 | throw; |
8bcb5208 | 1019 | } |
8bcb5208 AB |
1020 | |
1021 | if (pc_p) | |
1022 | { | |
1023 | this_frame->prev_pc.value = pc; | |
1024 | this_frame->prev_pc.status = CC_VALUE; | |
a05a883f SM |
1025 | |
1026 | frame_debug_printf ("this_frame=%d -> %s", | |
1027 | this_frame->level, | |
1028 | hex_string (this_frame->prev_pc.value)); | |
12cc2063 | 1029 | } |
f18c5a73 | 1030 | } |
e3eebbd7 | 1031 | |
782d47df PA |
1032 | if (this_frame->prev_pc.status == CC_VALUE) |
1033 | return this_frame->prev_pc.value; | |
1034 | else if (this_frame->prev_pc.status == CC_UNAVAILABLE) | |
e3eebbd7 | 1035 | throw_error (NOT_AVAILABLE_ERROR, _("PC not available")); |
782d47df PA |
1036 | else if (this_frame->prev_pc.status == CC_NOT_SAVED) |
1037 | throw_error (OPTIMIZED_OUT_ERROR, _("PC not saved")); | |
e3eebbd7 | 1038 | else |
f34652de | 1039 | internal_error ("unexpected prev_pc status: %d", |
782d47df | 1040 | (int) this_frame->prev_pc.status); |
f18c5a73 AC |
1041 | } |
1042 | ||
edb3359d | 1043 | CORE_ADDR |
8480a37e | 1044 | frame_unwind_caller_pc (const frame_info_ptr &initial_this_frame) |
edb3359d | 1045 | { |
8480a37e | 1046 | frame_info_ptr this_frame = skip_artificial_frames (initial_this_frame); |
33b4777c MM |
1047 | |
1048 | /* We must have a non-artificial frame. The caller is supposed to check | |
1049 | the result of frame_unwind_caller_id (), which returns NULL_FRAME_ID | |
1050 | in this case. */ | |
8480a37e | 1051 | gdb_assert (this_frame != nullptr); |
33b4777c MM |
1052 | |
1053 | return frame_unwind_pc (this_frame); | |
edb3359d DJ |
1054 | } |
1055 | ||
97916bfe | 1056 | bool |
8480a37e | 1057 | get_frame_func_if_available (const frame_info_ptr &this_frame, CORE_ADDR *pc) |
be41e9f4 | 1058 | { |
bd2b40ac | 1059 | frame_info *next_frame = this_frame->next; |
ef02daa9 | 1060 | |
fedfee88 | 1061 | if (next_frame->prev_func.status == CC_UNKNOWN) |
be41e9f4 | 1062 | { |
e3eebbd7 PA |
1063 | CORE_ADDR addr_in_block; |
1064 | ||
57bfe177 | 1065 | /* Make certain that this, and not the adjacent, function is |
dda83cd7 | 1066 | found. */ |
e3eebbd7 PA |
1067 | if (!get_frame_address_in_block_if_available (this_frame, &addr_in_block)) |
1068 | { | |
fedfee88 | 1069 | next_frame->prev_func.status = CC_UNAVAILABLE; |
a05a883f SM |
1070 | |
1071 | frame_debug_printf ("this_frame=%d -> unavailable", | |
1072 | this_frame->level); | |
e3eebbd7 PA |
1073 | } |
1074 | else | |
1075 | { | |
fedfee88 | 1076 | next_frame->prev_func.status = CC_VALUE; |
e3eebbd7 | 1077 | next_frame->prev_func.addr = get_pc_function_start (addr_in_block); |
a05a883f SM |
1078 | |
1079 | frame_debug_printf ("this_frame=%d -> %s", | |
1080 | this_frame->level, | |
1081 | hex_string (next_frame->prev_func.addr)); | |
e3eebbd7 | 1082 | } |
be41e9f4 | 1083 | } |
e3eebbd7 | 1084 | |
fedfee88 | 1085 | if (next_frame->prev_func.status == CC_UNAVAILABLE) |
e3eebbd7 PA |
1086 | { |
1087 | *pc = -1; | |
97916bfe | 1088 | return false; |
e3eebbd7 PA |
1089 | } |
1090 | else | |
1091 | { | |
fedfee88 SM |
1092 | gdb_assert (next_frame->prev_func.status == CC_VALUE); |
1093 | ||
e3eebbd7 | 1094 | *pc = next_frame->prev_func.addr; |
97916bfe | 1095 | return true; |
e3eebbd7 PA |
1096 | } |
1097 | } | |
1098 | ||
1099 | CORE_ADDR | |
8480a37e | 1100 | get_frame_func (const frame_info_ptr &this_frame) |
e3eebbd7 PA |
1101 | { |
1102 | CORE_ADDR pc; | |
1103 | ||
1104 | if (!get_frame_func_if_available (this_frame, &pc)) | |
1105 | throw_error (NOT_AVAILABLE_ERROR, _("PC not available")); | |
1106 | ||
1107 | return pc; | |
be41e9f4 AC |
1108 | } |
1109 | ||
daf6667d | 1110 | std::unique_ptr<readonly_detached_regcache> |
8480a37e | 1111 | frame_save_as_regcache (const frame_info_ptr &this_frame) |
a81dcb05 | 1112 | { |
51e6b8cf | 1113 | auto cooked_read = [this_frame] (int regnum, gdb::array_view<gdb_byte> buf) |
302abd6e | 1114 | { |
51e6b8cf | 1115 | if (!deprecated_frame_register_read (this_frame, regnum, buf.data ())) |
302abd6e SM |
1116 | return REG_UNAVAILABLE; |
1117 | else | |
1118 | return REG_VALID; | |
1119 | }; | |
1120 | ||
daf6667d | 1121 | std::unique_ptr<readonly_detached_regcache> regcache |
302abd6e | 1122 | (new readonly_detached_regcache (get_frame_arch (this_frame), cooked_read)); |
1c4d3f96 | 1123 | |
a81dcb05 AC |
1124 | return regcache; |
1125 | } | |
1126 | ||
dbe9fe58 | 1127 | void |
8480a37e | 1128 | frame_pop (const frame_info_ptr &this_frame) |
7a25a7c1 | 1129 | { |
bd2b40ac | 1130 | frame_info_ptr prev_frame; |
348473d5 | 1131 | |
b89667eb DE |
1132 | if (get_frame_type (this_frame) == DUMMY_FRAME) |
1133 | { | |
1134 | /* Popping a dummy frame involves restoring more than just registers. | |
1135 | dummy_frame_pop does all the work. */ | |
00431a78 | 1136 | dummy_frame_pop (get_frame_id (this_frame), inferior_thread ()); |
b89667eb DE |
1137 | return; |
1138 | } | |
1139 | ||
348473d5 | 1140 | /* Ensure that we have a frame to pop to. */ |
51d48146 | 1141 | prev_frame = get_prev_frame_always (this_frame); |
348473d5 NF |
1142 | |
1143 | if (!prev_frame) | |
1144 | error (_("Cannot pop the initial frame.")); | |
1145 | ||
1ab3b62c JK |
1146 | /* Ignore TAILCALL_FRAME type frames, they were executed already before |
1147 | entering THISFRAME. */ | |
2f3ef606 | 1148 | prev_frame = skip_tailcall_frames (prev_frame); |
1ab3b62c | 1149 | |
33b4777c MM |
1150 | if (prev_frame == NULL) |
1151 | error (_("Cannot find the caller frame.")); | |
1152 | ||
c1bf6f65 AC |
1153 | /* Make a copy of all the register values unwound from this frame. |
1154 | Save them in a scratch buffer so that there isn't a race between | |
594f7785 | 1155 | trying to extract the old values from the current regcache while |
c1bf6f65 | 1156 | at the same time writing new values into that same cache. */ |
daf6667d | 1157 | std::unique_ptr<readonly_detached_regcache> scratch |
9ac86b52 | 1158 | = frame_save_as_regcache (prev_frame); |
c1bf6f65 AC |
1159 | |
1160 | /* FIXME: cagney/2003-03-16: It should be possible to tell the | |
1161 | target's register cache that it is about to be hit with a burst | |
1162 | register transfer and that the sequence of register writes should | |
1163 | be batched. The pair target_prepare_to_store() and | |
1164 | target_store_registers() kind of suggest this functionality. | |
1165 | Unfortunately, they don't implement it. Their lack of a formal | |
1166 | definition can lead to targets writing back bogus values | |
1167 | (arguably a bug in the target code mind). */ | |
fc5b8736 | 1168 | /* Now copy those saved registers into the current regcache. */ |
9c742269 | 1169 | get_thread_regcache (inferior_thread ())->restore (scratch.get ()); |
7a25a7c1 | 1170 | |
7a25a7c1 AC |
1171 | /* We've made right mess of GDB's local state, just discard |
1172 | everything. */ | |
35f196d9 | 1173 | reinit_frame_cache (); |
dbe9fe58 | 1174 | } |
c689142b | 1175 | |
4f460812 | 1176 | void |
8480a37e | 1177 | frame_register_unwind (const frame_info_ptr &next_frame, int regnum, |
0fdb4f18 PA |
1178 | int *optimizedp, int *unavailablep, |
1179 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
1180 | int *realnump, gdb_byte *bufferp) | |
4f460812 | 1181 | { |
669fac23 | 1182 | struct value *value; |
7f78e237 | 1183 | |
4f460812 AC |
1184 | /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates |
1185 | that the value proper does not need to be fetched. */ | |
1186 | gdb_assert (optimizedp != NULL); | |
1187 | gdb_assert (lvalp != NULL); | |
1188 | gdb_assert (addrp != NULL); | |
1189 | gdb_assert (realnump != NULL); | |
1190 | /* gdb_assert (bufferp != NULL); */ | |
1191 | ||
0ee6c332 | 1192 | value = frame_unwind_register_value (next_frame, regnum); |
4f460812 | 1193 | |
669fac23 | 1194 | gdb_assert (value != NULL); |
c50901fd | 1195 | |
d00664db TT |
1196 | *optimizedp = value->optimized_out (); |
1197 | *unavailablep = !value->entirely_available (); | |
736355f2 | 1198 | *lvalp = value->lval (); |
9feb2d07 | 1199 | *addrp = value->address (); |
7c2ba67e | 1200 | if (*lvalp == lval_register) |
78f2fd84 | 1201 | *realnump = value->regnum (); |
7c2ba67e YQ |
1202 | else |
1203 | *realnump = -1; | |
6dc42492 | 1204 | |
0fdb4f18 PA |
1205 | if (bufferp) |
1206 | { | |
1207 | if (!*optimizedp && !*unavailablep) | |
efaf1ae0 | 1208 | memcpy (bufferp, value->contents_all ().data (), |
d0c97917 | 1209 | value->type ()->length ()); |
0fdb4f18 | 1210 | else |
d0c97917 | 1211 | memset (bufferp, 0, value->type ()->length ()); |
0fdb4f18 | 1212 | } |
669fac23 DJ |
1213 | |
1214 | /* Dispose of the new value. This prevents watchpoints from | |
1215 | trying to watch the saved frame pointer. */ | |
1216 | release_value (value); | |
4f460812 AC |
1217 | } |
1218 | ||
135c175f | 1219 | void |
8480a37e | 1220 | frame_unwind_register (const frame_info_ptr &next_frame, int regnum, gdb_byte *buf) |
135c175f AC |
1221 | { |
1222 | int optimized; | |
0fdb4f18 | 1223 | int unavailable; |
135c175f AC |
1224 | CORE_ADDR addr; |
1225 | int realnum; | |
1226 | enum lval_type lval; | |
1c4d3f96 | 1227 | |
0ee6c332 | 1228 | frame_register_unwind (next_frame, regnum, &optimized, &unavailable, |
0fdb4f18 | 1229 | &lval, &addr, &realnum, buf); |
8fbca658 PA |
1230 | |
1231 | if (optimized) | |
710409a2 PA |
1232 | throw_error (OPTIMIZED_OUT_ERROR, |
1233 | _("Register %d was not saved"), regnum); | |
8fbca658 PA |
1234 | if (unavailable) |
1235 | throw_error (NOT_AVAILABLE_ERROR, | |
1236 | _("Register %d is not available"), regnum); | |
5b181d62 AC |
1237 | } |
1238 | ||
f0e7d0e8 | 1239 | void |
8480a37e | 1240 | get_frame_register (const frame_info_ptr &frame, |
10c42a71 | 1241 | int regnum, gdb_byte *buf) |
f0e7d0e8 | 1242 | { |
bd2b40ac | 1243 | frame_unwind_register (frame_info_ptr (frame->next), regnum, buf); |
f0e7d0e8 AC |
1244 | } |
1245 | ||
669fac23 | 1246 | struct value * |
8480a37e | 1247 | frame_unwind_register_value (const frame_info_ptr &next_frame, int regnum) |
669fac23 | 1248 | { |
fe67a58f | 1249 | FRAME_SCOPED_DEBUG_ENTER_EXIT; |
669fac23 | 1250 | |
0ee6c332 | 1251 | gdb_assert (next_frame != NULL); |
fe67a58f | 1252 | gdbarch *gdbarch = frame_unwind_arch (next_frame); |
a05a883f SM |
1253 | frame_debug_printf ("frame=%d, regnum=%d(%s)", |
1254 | next_frame->level, regnum, | |
1255 | user_reg_map_regnum_to_name (gdbarch, regnum)); | |
669fac23 DJ |
1256 | |
1257 | /* Find the unwinder. */ | |
0ee6c332 SM |
1258 | if (next_frame->unwind == NULL) |
1259 | frame_unwind_find_by_frame (next_frame, &next_frame->prologue_cache); | |
669fac23 DJ |
1260 | |
1261 | /* Ask this frame to unwind its register. */ | |
b3245cef SM |
1262 | value *value |
1263 | = next_frame->unwind->prev_register (next_frame, | |
1264 | &next_frame->prologue_cache, regnum); | |
1265 | if (value == nullptr) | |
1266 | { | |
1267 | if (gdbarch_pseudo_register_read_value_p (gdbarch)) | |
1268 | { | |
1269 | /* This is a pseudo register, we don't know how how what raw registers | |
1270 | this pseudo register is made of. Ask the gdbarch to read the | |
1271 | value, it will itself ask the next frame to unwind the values of | |
1272 | the raw registers it needs to compose the value of the pseudo | |
1273 | register. */ | |
1274 | value = gdbarch_pseudo_register_read_value | |
1275 | (gdbarch, next_frame, regnum); | |
1276 | } | |
1277 | else if (gdbarch_pseudo_register_read_p (gdbarch)) | |
1278 | { | |
1279 | value = value::allocate_register (next_frame, regnum); | |
1280 | ||
1281 | /* Passing the current regcache is known to be broken, the pseudo | |
1282 | register value will be constructed using the current raw registers, | |
1283 | rather than reading them using NEXT_FRAME. Architectures should be | |
1284 | migrated to gdbarch_pseudo_register_read_value. */ | |
1285 | register_status status = gdbarch_pseudo_register_read | |
1286 | (gdbarch, get_thread_regcache (inferior_thread ()), regnum, | |
1287 | value->contents_writeable ().data ()); | |
1288 | if (status == REG_UNAVAILABLE) | |
1289 | value->mark_bytes_unavailable (0, value->type ()->length ()); | |
1290 | } | |
1291 | else | |
1292 | error (_("Can't unwind value of register %d (%s)"), regnum, | |
1293 | user_reg_map_regnum_to_name (gdbarch, regnum)); | |
1294 | } | |
669fac23 DJ |
1295 | |
1296 | if (frame_debug) | |
1297 | { | |
a05a883f SM |
1298 | string_file debug_file; |
1299 | ||
6cb06a8c | 1300 | gdb_printf (&debug_file, " ->"); |
d00664db | 1301 | if (value->optimized_out ()) |
f6c01fc5 | 1302 | { |
6cb06a8c | 1303 | gdb_printf (&debug_file, " "); |
a05a883f | 1304 | val_print_not_saved (&debug_file); |
f6c01fc5 | 1305 | } |
669fac23 DJ |
1306 | else |
1307 | { | |
736355f2 | 1308 | if (value->lval () == lval_register) |
78f2fd84 | 1309 | gdb_printf (&debug_file, " register=%d", value->regnum ()); |
736355f2 | 1310 | else if (value->lval () == lval_memory) |
6cb06a8c TT |
1311 | gdb_printf (&debug_file, " address=%s", |
1312 | paddress (gdbarch, | |
9feb2d07 | 1313 | value->address ())); |
669fac23 | 1314 | else |
6cb06a8c | 1315 | gdb_printf (&debug_file, " computed"); |
669fac23 | 1316 | |
3ee3b270 | 1317 | if (value->lazy ()) |
6cb06a8c | 1318 | gdb_printf (&debug_file, " lazy"); |
306361f0 | 1319 | else if (value->entirely_available ()) |
669fac23 DJ |
1320 | { |
1321 | int i; | |
efaf1ae0 | 1322 | gdb::array_view<const gdb_byte> buf = value->contents (); |
669fac23 | 1323 | |
6cb06a8c TT |
1324 | gdb_printf (&debug_file, " bytes="); |
1325 | gdb_printf (&debug_file, "["); | |
36f15f55 | 1326 | for (i = 0; i < register_size (gdbarch, regnum); i++) |
6cb06a8c TT |
1327 | gdb_printf (&debug_file, "%02x", buf[i]); |
1328 | gdb_printf (&debug_file, "]"); | |
669fac23 | 1329 | } |
306361f0 TV |
1330 | else if (value->entirely_unavailable ()) |
1331 | gdb_printf (&debug_file, " unavailable"); | |
1332 | else | |
1333 | gdb_printf (&debug_file, " partly unavailable"); | |
669fac23 DJ |
1334 | } |
1335 | ||
a05a883f | 1336 | frame_debug_printf ("%s", debug_file.c_str ()); |
669fac23 DJ |
1337 | } |
1338 | ||
1339 | return value; | |
1340 | } | |
1341 | ||
1342 | struct value * | |
8480a37e | 1343 | get_frame_register_value (const frame_info_ptr &frame, int regnum) |
669fac23 | 1344 | { |
bd2b40ac | 1345 | return frame_unwind_register_value (frame_info_ptr (frame->next), regnum); |
669fac23 DJ |
1346 | } |
1347 | ||
f0e7d0e8 | 1348 | LONGEST |
8480a37e | 1349 | frame_unwind_register_signed (const frame_info_ptr &next_frame, int regnum) |
f0e7d0e8 | 1350 | { |
0ee6c332 | 1351 | struct gdbarch *gdbarch = frame_unwind_arch (next_frame); |
e17a4113 | 1352 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0ee6c332 | 1353 | struct value *value = frame_unwind_register_value (next_frame, regnum); |
1c4d3f96 | 1354 | |
9f7fb0aa AH |
1355 | gdb_assert (value != NULL); |
1356 | ||
d00664db | 1357 | if (value->optimized_out ()) |
9f7fb0aa AH |
1358 | { |
1359 | throw_error (OPTIMIZED_OUT_ERROR, | |
1360 | _("Register %d was not saved"), regnum); | |
1361 | } | |
d00664db | 1362 | if (!value->entirely_available ()) |
9f7fb0aa AH |
1363 | { |
1364 | throw_error (NOT_AVAILABLE_ERROR, | |
1365 | _("Register %d is not available"), regnum); | |
1366 | } | |
1367 | ||
efaf1ae0 | 1368 | LONGEST r = extract_signed_integer (value->contents_all (), byte_order); |
9f7fb0aa AH |
1369 | |
1370 | release_value (value); | |
9f7fb0aa | 1371 | return r; |
f0e7d0e8 AC |
1372 | } |
1373 | ||
1374 | LONGEST | |
8480a37e | 1375 | get_frame_register_signed (const frame_info_ptr &frame, int regnum) |
f0e7d0e8 | 1376 | { |
bd2b40ac | 1377 | return frame_unwind_register_signed (frame_info_ptr (frame->next), regnum); |
f0e7d0e8 AC |
1378 | } |
1379 | ||
1380 | ULONGEST | |
8480a37e | 1381 | frame_unwind_register_unsigned (const frame_info_ptr &next_frame, int regnum) |
f0e7d0e8 | 1382 | { |
0ee6c332 | 1383 | struct gdbarch *gdbarch = frame_unwind_arch (next_frame); |
e17a4113 UW |
1384 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
1385 | int size = register_size (gdbarch, regnum); | |
0ee6c332 | 1386 | struct value *value = frame_unwind_register_value (next_frame, regnum); |
1c4d3f96 | 1387 | |
2cad08ea YQ |
1388 | gdb_assert (value != NULL); |
1389 | ||
d00664db | 1390 | if (value->optimized_out ()) |
2cad08ea YQ |
1391 | { |
1392 | throw_error (OPTIMIZED_OUT_ERROR, | |
1393 | _("Register %d was not saved"), regnum); | |
1394 | } | |
d00664db | 1395 | if (!value->entirely_available ()) |
2cad08ea YQ |
1396 | { |
1397 | throw_error (NOT_AVAILABLE_ERROR, | |
1398 | _("Register %d is not available"), regnum); | |
1399 | } | |
1400 | ||
efaf1ae0 | 1401 | ULONGEST r = extract_unsigned_integer (value->contents_all ().data (), |
50888e42 | 1402 | size, byte_order); |
2cad08ea YQ |
1403 | |
1404 | release_value (value); | |
2cad08ea | 1405 | return r; |
f0e7d0e8 AC |
1406 | } |
1407 | ||
1408 | ULONGEST | |
8480a37e | 1409 | get_frame_register_unsigned (const frame_info_ptr &frame, int regnum) |
f0e7d0e8 | 1410 | { |
bd2b40ac | 1411 | return frame_unwind_register_unsigned (frame_info_ptr (frame->next), regnum); |
f0e7d0e8 AC |
1412 | } |
1413 | ||
97916bfe | 1414 | bool |
8480a37e | 1415 | read_frame_register_unsigned (const frame_info_ptr &frame, int regnum, |
ad5f7d6e PA |
1416 | ULONGEST *val) |
1417 | { | |
1418 | struct value *regval = get_frame_register_value (frame, regnum); | |
1419 | ||
d00664db TT |
1420 | if (!regval->optimized_out () |
1421 | && regval->entirely_available ()) | |
ad5f7d6e PA |
1422 | { |
1423 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
1424 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
78f2fd84 | 1425 | int size = register_size (gdbarch, regval->regnum ()); |
ad5f7d6e | 1426 | |
efaf1ae0 | 1427 | *val = extract_unsigned_integer (regval->contents ().data (), size, |
50888e42 | 1428 | byte_order); |
97916bfe | 1429 | return true; |
ad5f7d6e PA |
1430 | } |
1431 | ||
97916bfe | 1432 | return false; |
ad5f7d6e PA |
1433 | } |
1434 | ||
ff2e87ac | 1435 | void |
8480a37e | 1436 | put_frame_register (const frame_info_ptr &next_frame, int regnum, |
584468de | 1437 | gdb::array_view<const gdb_byte> buf) |
ff2e87ac | 1438 | { |
584468de | 1439 | gdbarch *gdbarch = frame_unwind_arch (next_frame); |
ff2e87ac AC |
1440 | int realnum; |
1441 | int optim; | |
0fdb4f18 | 1442 | int unavail; |
ff2e87ac AC |
1443 | enum lval_type lval; |
1444 | CORE_ADDR addr; | |
f6e3d557 SM |
1445 | int size = register_size (gdbarch, regnum); |
1446 | ||
1447 | gdb_assert (buf.size () == size); | |
1c4d3f96 | 1448 | |
584468de SM |
1449 | frame_register_unwind (next_frame, regnum, &optim, &unavail, &lval, &addr, |
1450 | &realnum, nullptr); | |
ff2e87ac | 1451 | if (optim) |
901461f8 | 1452 | error (_("Attempt to assign to a register that was not saved.")); |
ff2e87ac AC |
1453 | switch (lval) |
1454 | { | |
1455 | case lval_memory: | |
1456 | { | |
f6e3d557 | 1457 | write_memory (addr, buf.data (), size); |
ff2e87ac AC |
1458 | break; |
1459 | } | |
1460 | case lval_register: | |
1f624181 SM |
1461 | /* Not sure if that's always true... but we have a problem if not. */ |
1462 | gdb_assert (size == register_size (gdbarch, realnum)); | |
1463 | ||
1464 | if (realnum < gdbarch_num_regs (gdbarch) | |
1465 | || !gdbarch_pseudo_register_write_p (gdbarch)) | |
1466 | get_thread_regcache (inferior_thread ())->cooked_write (realnum, buf); | |
1467 | else | |
1468 | gdbarch_pseudo_register_write (gdbarch, next_frame, realnum, buf); | |
ff2e87ac AC |
1469 | break; |
1470 | default: | |
8a3fe4f8 | 1471 | error (_("Attempt to assign to an unmodifiable value.")); |
ff2e87ac AC |
1472 | } |
1473 | } | |
1474 | ||
b2c7d45a JB |
1475 | /* This function is deprecated. Use get_frame_register_value instead, |
1476 | which provides more accurate information. | |
d65fe839 | 1477 | |
cda5a58a | 1478 | Find and return the value of REGNUM for the specified stack frame. |
5bc602c7 | 1479 | The number of bytes copied is REGISTER_SIZE (REGNUM). |
d65fe839 | 1480 | |
cda5a58a | 1481 | Returns 0 if the register value could not be found. */ |
d65fe839 | 1482 | |
97916bfe | 1483 | bool |
8480a37e | 1484 | deprecated_frame_register_read (const frame_info_ptr &frame, int regnum, |
97916bfe | 1485 | gdb_byte *myaddr) |
d65fe839 | 1486 | { |
a216a322 | 1487 | int optimized; |
0fdb4f18 | 1488 | int unavailable; |
a216a322 AC |
1489 | enum lval_type lval; |
1490 | CORE_ADDR addr; | |
1491 | int realnum; | |
1c4d3f96 | 1492 | |
2461802c SM |
1493 | frame_register_unwind (get_next_frame_sentinel_okay (frame), regnum, |
1494 | &optimized, &unavailable, &lval, &addr, &realnum, | |
1495 | myaddr); | |
d65fe839 | 1496 | |
0fdb4f18 | 1497 | return !optimized && !unavailable; |
d65fe839 | 1498 | } |
e36180d7 | 1499 | |
97916bfe | 1500 | bool |
8480a37e | 1501 | get_frame_register_bytes (const frame_info_ptr &next_frame, int regnum, |
9fc79b42 | 1502 | CORE_ADDR offset, gdb::array_view<gdb_byte> buffer, |
8dccd430 | 1503 | int *optimizedp, int *unavailablep) |
00fa51f6 | 1504 | { |
9fc79b42 | 1505 | gdbarch *gdbarch = frame_unwind_arch (next_frame); |
00fa51f6 UW |
1506 | |
1507 | /* Skip registers wholly inside of OFFSET. */ | |
1508 | while (offset >= register_size (gdbarch, regnum)) | |
1509 | { | |
1510 | offset -= register_size (gdbarch, regnum); | |
1511 | regnum++; | |
1512 | } | |
1513 | ||
26fae1d6 AS |
1514 | /* Ensure that we will not read beyond the end of the register file. |
1515 | This can only ever happen if the debug information is bad. */ | |
e94d1f72 SM |
1516 | int maxsize = -offset; |
1517 | int numregs = gdbarch_num_cooked_regs (gdbarch); | |
1518 | for (int i = regnum; i < numregs; i++) | |
3f27f2a4 AS |
1519 | { |
1520 | int thissize = register_size (gdbarch, i); | |
bb9bcb69 | 1521 | |
3f27f2a4 | 1522 | if (thissize == 0) |
26fae1d6 | 1523 | break; /* This register is not available on this architecture. */ |
3f27f2a4 AS |
1524 | maxsize += thissize; |
1525 | } | |
bdec2917 | 1526 | |
e94d1f72 | 1527 | if (buffer.size () > maxsize) |
8dccd430 | 1528 | error (_("Bad debug information detected: " |
e94d1f72 | 1529 | "Attempt to read %zu bytes from registers."), buffer.size ()); |
3f27f2a4 | 1530 | |
00fa51f6 | 1531 | /* Copy the data. */ |
e94d1f72 | 1532 | while (!buffer.empty ()) |
00fa51f6 | 1533 | { |
e94d1f72 SM |
1534 | int curr_len = std::min<int> (register_size (gdbarch, regnum) - offset, |
1535 | buffer.size ()); | |
bdec2917 | 1536 | |
00fa51f6 UW |
1537 | if (curr_len == register_size (gdbarch, regnum)) |
1538 | { | |
8dccd430 PA |
1539 | enum lval_type lval; |
1540 | CORE_ADDR addr; | |
1541 | int realnum; | |
1542 | ||
9fc79b42 SM |
1543 | frame_register_unwind (next_frame, regnum, optimizedp, unavailablep, |
1544 | &lval, &addr, &realnum, buffer.data ()); | |
8dccd430 | 1545 | if (*optimizedp || *unavailablep) |
97916bfe | 1546 | return false; |
00fa51f6 UW |
1547 | } |
1548 | else | |
1549 | { | |
9fc79b42 | 1550 | value *value = frame_unwind_register_value (next_frame, regnum); |
db3a1dc7 | 1551 | gdb_assert (value != NULL); |
d00664db TT |
1552 | *optimizedp = value->optimized_out (); |
1553 | *unavailablep = !value->entirely_available (); | |
bb9bcb69 | 1554 | |
8dccd430 | 1555 | if (*optimizedp || *unavailablep) |
db3a1dc7 AH |
1556 | { |
1557 | release_value (value); | |
97916bfe | 1558 | return false; |
db3a1dc7 | 1559 | } |
97916bfe | 1560 | |
e94d1f72 SM |
1561 | copy (value->contents_all ().slice (offset, curr_len), |
1562 | buffer.slice (0, curr_len)); | |
db3a1dc7 | 1563 | release_value (value); |
00fa51f6 UW |
1564 | } |
1565 | ||
e94d1f72 | 1566 | buffer = buffer.slice (curr_len); |
00fa51f6 UW |
1567 | offset = 0; |
1568 | regnum++; | |
1569 | } | |
1570 | ||
8dccd430 PA |
1571 | *optimizedp = 0; |
1572 | *unavailablep = 0; | |
97916bfe SM |
1573 | |
1574 | return true; | |
00fa51f6 UW |
1575 | } |
1576 | ||
1577 | void | |
8480a37e | 1578 | put_frame_register_bytes (const frame_info_ptr &next_frame, int regnum, |
bdec2917 LM |
1579 | CORE_ADDR offset, |
1580 | gdb::array_view<const gdb_byte> buffer) | |
00fa51f6 | 1581 | { |
534dcbcb | 1582 | gdbarch *gdbarch = frame_unwind_arch (next_frame); |
00fa51f6 UW |
1583 | |
1584 | /* Skip registers wholly inside of OFFSET. */ | |
1585 | while (offset >= register_size (gdbarch, regnum)) | |
1586 | { | |
1587 | offset -= register_size (gdbarch, regnum); | |
1588 | regnum++; | |
1589 | } | |
1590 | ||
1591 | /* Copy the data. */ | |
e94d1f72 | 1592 | while (!buffer.empty ()) |
00fa51f6 | 1593 | { |
e94d1f72 SM |
1594 | int curr_len = std::min<int> (register_size (gdbarch, regnum) - offset, |
1595 | buffer.size ()); | |
bb9bcb69 | 1596 | |
00fa51f6 | 1597 | if (curr_len == register_size (gdbarch, regnum)) |
534dcbcb | 1598 | put_frame_register (next_frame, regnum, buffer.slice (0, curr_len)); |
00fa51f6 UW |
1599 | else |
1600 | { | |
534dcbcb | 1601 | value *value = frame_unwind_register_value (next_frame, regnum); |
e94d1f72 | 1602 | gdb_assert (value != nullptr); |
db3a1dc7 | 1603 | |
e94d1f72 SM |
1604 | copy (buffer.slice (0, curr_len), |
1605 | value->contents_writeable ().slice (offset, curr_len)); | |
534dcbcb | 1606 | put_frame_register (next_frame, regnum, value->contents_raw ()); |
db3a1dc7 | 1607 | release_value (value); |
00fa51f6 UW |
1608 | } |
1609 | ||
e94d1f72 | 1610 | buffer = buffer.slice (curr_len); |
00fa51f6 UW |
1611 | offset = 0; |
1612 | regnum++; | |
1613 | } | |
1614 | } | |
e36180d7 | 1615 | |
19f98835 | 1616 | /* Create a sentinel frame. |
a94dd1fd | 1617 | |
19f98835 SM |
1618 | See frame_id_build_sentinel for the description of STACK_ADDR and |
1619 | CODE_ADDR. */ | |
1620 | ||
1621 | static frame_info_ptr | |
74387712 SM |
1622 | create_sentinel_frame (program_space *pspace, address_space *aspace, |
1623 | regcache *regcache, CORE_ADDR stack_addr, | |
1624 | CORE_ADDR code_addr) | |
a94dd1fd | 1625 | { |
bd2b40ac | 1626 | frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info); |
1c4d3f96 | 1627 | |
a94dd1fd | 1628 | frame->level = -1; |
6c95b8df | 1629 | frame->pspace = pspace; |
74387712 | 1630 | frame->aspace = aspace; |
a94dd1fd AC |
1631 | /* Explicitly initialize the sentinel frame's cache. Provide it |
1632 | with the underlying regcache. In the future additional | |
1633 | information, such as the frame's thread will be added. */ | |
6dc42492 | 1634 | frame->prologue_cache = sentinel_frame_cache (regcache); |
a94dd1fd | 1635 | /* For the moment there is only one sentinel frame implementation. */ |
39d7b0e2 | 1636 | frame->unwind = &sentinel_frame_unwind; |
a94dd1fd AC |
1637 | /* Link this frame back to itself. The frame is self referential |
1638 | (the unwound PC is the same as the pc), so make it so. */ | |
1639 | frame->next = frame; | |
df433d31 | 1640 | /* The sentinel frame has a special ID. */ |
d19c3068 | 1641 | frame->this_id.p = frame_id_status::COMPUTED; |
19f98835 SM |
1642 | frame->this_id.value = frame_id_build_sentinel (stack_addr, code_addr); |
1643 | ||
1644 | bool added = frame_stash_add (frame); | |
1645 | gdb_assert (added); | |
a05a883f SM |
1646 | |
1647 | frame_debug_printf (" -> %s", frame->to_string ().c_str ()); | |
1648 | ||
19f98835 | 1649 | return frame_info_ptr (frame); |
a94dd1fd AC |
1650 | } |
1651 | ||
4c1e7e9d AC |
1652 | /* Cache for frame addresses already read by gdb. Valid only while |
1653 | inferior is stopped. Control variables for the frame cache should | |
1654 | be local to this module. */ | |
1655 | ||
1656 | static struct obstack frame_cache_obstack; | |
1657 | ||
1658 | void * | |
479ab5a0 | 1659 | frame_obstack_zalloc (unsigned long size) |
4c1e7e9d | 1660 | { |
479ab5a0 | 1661 | void *data = obstack_alloc (&frame_cache_obstack, size); |
1c4d3f96 | 1662 | |
479ab5a0 AC |
1663 | memset (data, 0, size); |
1664 | return data; | |
4c1e7e9d AC |
1665 | } |
1666 | ||
8480a37e | 1667 | static frame_info_ptr get_prev_frame_always_1 (const frame_info_ptr &this_frame); |
4c1e7e9d | 1668 | |
9efe17a3 | 1669 | frame_info_ptr |
4c1e7e9d AC |
1670 | get_current_frame (void) |
1671 | { | |
bd2b40ac | 1672 | frame_info_ptr current_frame; |
df433d31 | 1673 | |
0a1e1ca1 AC |
1674 | /* First check, and report, the lack of registers. Having GDB |
1675 | report "No stack!" or "No memory" when the target doesn't even | |
1676 | have registers is very confusing. Besides, "printcmd.exp" | |
1677 | explicitly checks that ``print $pc'' with no registers prints "No | |
1678 | registers". */ | |
9dccd06e | 1679 | if (!target_has_registers ()) |
8a3fe4f8 | 1680 | error (_("No registers.")); |
841de120 | 1681 | if (!target_has_stack ()) |
8a3fe4f8 | 1682 | error (_("No stack.")); |
a739972c | 1683 | if (!target_has_memory ()) |
8a3fe4f8 | 1684 | error (_("No memory.")); |
2ce6d6bf SS |
1685 | /* Traceframes are effectively a substitute for the live inferior. */ |
1686 | if (get_traceframe_number () < 0) | |
a911d87a | 1687 | validate_registers_access (); |
8ea051c5 | 1688 | |
df433d31 KB |
1689 | if (sentinel_frame == NULL) |
1690 | sentinel_frame = | |
f9582a22 TV |
1691 | create_sentinel_frame (current_program_space, |
1692 | current_inferior ()->aspace.get (), | |
9c742269 SM |
1693 | get_thread_regcache (inferior_thread ()), |
1694 | 0, 0).get (); | |
df433d31 KB |
1695 | |
1696 | /* Set the current frame before computing the frame id, to avoid | |
1697 | recursion inside compute_frame_id, in case the frame's | |
1698 | unwinder decides to do a symbol lookup (which depends on the | |
1699 | selected frame's block). | |
1700 | ||
1701 | This call must always succeed. In particular, nothing inside | |
1702 | get_prev_frame_always_1 should try to unwind from the | |
1703 | sentinel frame, because that could fail/throw, and we always | |
1704 | want to leave with the current frame created and linked in -- | |
1705 | we should never end up with the sentinel frame as outermost | |
1706 | frame. */ | |
bd2b40ac | 1707 | current_frame = get_prev_frame_always_1 (frame_info_ptr (sentinel_frame)); |
df433d31 | 1708 | gdb_assert (current_frame != NULL); |
f245535c | 1709 | |
4c1e7e9d AC |
1710 | return current_frame; |
1711 | } | |
1712 | ||
6e7f8b9c | 1713 | /* The "selected" stack frame is used by default for local and arg |
79952e69 PA |
1714 | access. |
1715 | ||
1716 | The "single source of truth" for the selected frame is the | |
1717 | SELECTED_FRAME_ID / SELECTED_FRAME_LEVEL pair. | |
1718 | ||
1719 | Frame IDs can be saved/restored across reinitializing the frame | |
1720 | cache, while frame_info pointers can't (frame_info objects are | |
1721 | invalidated). If we know the corresponding frame_info object, it | |
1722 | is cached in SELECTED_FRAME. | |
1723 | ||
1724 | If SELECTED_FRAME_ID / SELECTED_FRAME_LEVEL are null_frame_id / -1, | |
1725 | and the target has stack and is stopped, the selected frame is the | |
bc2cbe81 SM |
1726 | current (innermost) target frame. SELECTED_FRAME_ID is never the ID |
1727 | of the current (innermost) target frame. SELECTED_FRAME_LEVEL may | |
1728 | only be 0 if the selected frame is a user-created one (created and | |
1729 | selected through the "select-frame view" command), in which case | |
1730 | SELECTED_FRAME_ID is the frame id derived from the user-provided | |
1731 | addresses. | |
79952e69 PA |
1732 | |
1733 | If SELECTED_FRAME_ID / SELECTED_FRAME_LEVEL are null_frame_id / -1, | |
1734 | and the target has no stack or is executing, then there's no | |
1735 | selected frame. */ | |
1736 | static frame_id selected_frame_id = null_frame_id; | |
1737 | static int selected_frame_level = -1; | |
1738 | ||
751c7c72 TV |
1739 | /* See frame.h. This definition should come before any definition of a static |
1740 | frame_info_ptr, to ensure that frame_list is destroyed after any static | |
1741 | frame_info_ptr. This is necessary because the destructor of frame_info_ptr | |
1742 | uses frame_list. */ | |
1743 | ||
1744 | intrusive_list<frame_info_ptr> frame_info_ptr::frame_list; | |
1745 | ||
79952e69 PA |
1746 | /* The cached frame_info object pointing to the selected frame. |
1747 | Looked up on demand by get_selected_frame. */ | |
bd2b40ac | 1748 | static frame_info_ptr selected_frame; |
6e7f8b9c | 1749 | |
79952e69 PA |
1750 | /* See frame.h. */ |
1751 | ||
1752 | void | |
1753 | save_selected_frame (frame_id *frame_id, int *frame_level) | |
1754 | noexcept | |
1755 | { | |
1756 | *frame_id = selected_frame_id; | |
1757 | *frame_level = selected_frame_level; | |
1758 | } | |
1759 | ||
1760 | /* See frame.h. */ | |
1761 | ||
1762 | void | |
1763 | restore_selected_frame (frame_id frame_id, int frame_level) | |
1764 | noexcept | |
1765 | { | |
bc2cbe81 SM |
1766 | /* Unless it is a user-created frame, save_selected_frame never returns |
1767 | level == 0, so we shouldn't see it here either. */ | |
1768 | gdb_assert (frame_level != 0 || frame_id.user_created_p); | |
79952e69 PA |
1769 | |
1770 | /* FRAME_ID can be null_frame_id only IFF frame_level is -1. */ | |
1771 | gdb_assert ((frame_level == -1 && !frame_id_p (frame_id)) | |
1772 | || (frame_level != -1 && frame_id_p (frame_id))); | |
1773 | ||
1774 | selected_frame_id = frame_id; | |
1775 | selected_frame_level = frame_level; | |
1776 | ||
1777 | /* Will be looked up later by get_selected_frame. */ | |
1778 | selected_frame = nullptr; | |
1779 | } | |
1780 | ||
412cf590 SM |
1781 | /* Lookup the frame_info object for the selected frame FRAME_ID / |
1782 | FRAME_LEVEL and cache the result. | |
d70bdd3c | 1783 | |
412cf590 SM |
1784 | If FRAME_LEVEL > 0 and the originally selected frame isn't found, |
1785 | warn and select the innermost (current) frame. */ | |
1786 | ||
1787 | static void | |
d70bdd3c PA |
1788 | lookup_selected_frame (struct frame_id a_frame_id, int frame_level) |
1789 | { | |
bd2b40ac | 1790 | frame_info_ptr frame = NULL; |
d70bdd3c PA |
1791 | int count; |
1792 | ||
1793 | /* This either means there was no selected frame, or the selected | |
1794 | frame was the current frame. In either case, select the current | |
1795 | frame. */ | |
1796 | if (frame_level == -1) | |
1797 | { | |
1798 | select_frame (get_current_frame ()); | |
1799 | return; | |
1800 | } | |
1801 | ||
bc2cbe81 SM |
1802 | /* This means the selected frame was a user-created one. Create a new one |
1803 | using the user-provided addresses, which happen to be in the frame id. */ | |
1804 | if (frame_level == 0) | |
1805 | { | |
1806 | gdb_assert (a_frame_id.user_created_p); | |
1807 | select_frame (create_new_frame (a_frame_id)); | |
1808 | return; | |
1809 | } | |
1810 | ||
d70bdd3c PA |
1811 | /* select_frame never saves 0 in SELECTED_FRAME_LEVEL, so we |
1812 | shouldn't see it here. */ | |
1813 | gdb_assert (frame_level > 0); | |
1814 | ||
1815 | /* Restore by level first, check if the frame id is the same as | |
1816 | expected. If that fails, try restoring by frame id. If that | |
1817 | fails, nothing to do, just warn the user. */ | |
1818 | ||
1819 | count = frame_level; | |
1820 | frame = find_relative_frame (get_current_frame (), &count); | |
1821 | if (count == 0 | |
1822 | && frame != NULL | |
1823 | /* The frame ids must match - either both valid or both | |
1824 | outer_frame_id. The latter case is not failsafe, but since | |
1825 | it's highly unlikely the search by level finds the wrong | |
1826 | frame, it's 99.9(9)% of the time (for all practical purposes) | |
1827 | safe. */ | |
a0cbd650 | 1828 | && get_frame_id (frame) == a_frame_id) |
d70bdd3c PA |
1829 | { |
1830 | /* Cool, all is fine. */ | |
1831 | select_frame (frame); | |
1832 | return; | |
1833 | } | |
1834 | ||
1835 | frame = frame_find_by_id (a_frame_id); | |
1836 | if (frame != NULL) | |
1837 | { | |
1838 | /* Cool, refound it. */ | |
1839 | select_frame (frame); | |
1840 | return; | |
1841 | } | |
1842 | ||
1843 | /* Nothing else to do, the frame layout really changed. Select the | |
1844 | innermost stack frame. */ | |
1845 | select_frame (get_current_frame ()); | |
1846 | ||
1847 | /* Warn the user. */ | |
1848 | if (frame_level > 0 && !current_uiout->is_mi_like_p ()) | |
1849 | { | |
1850 | warning (_("Couldn't restore frame #%d in " | |
1851 | "current thread. Bottom (innermost) frame selected:"), | |
1852 | frame_level); | |
1853 | /* For MI, we should probably have a notification about current | |
1854 | frame change. But this error is not very likely, so don't | |
1855 | bother for now. */ | |
1856 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); | |
1857 | } | |
1858 | } | |
1859 | ||
97916bfe SM |
1860 | bool |
1861 | has_stack_frames () | |
8ea051c5 | 1862 | { |
9dccd06e TT |
1863 | if (!target_has_registers () || !target_has_stack () |
1864 | || !target_has_memory ()) | |
97916bfe | 1865 | return false; |
8ea051c5 | 1866 | |
861152be LM |
1867 | /* Traceframes are effectively a substitute for the live inferior. */ |
1868 | if (get_traceframe_number () < 0) | |
1869 | { | |
1870 | /* No current inferior, no frame. */ | |
00431a78 | 1871 | if (inferior_ptid == null_ptid) |
97916bfe | 1872 | return false; |
d729566a | 1873 | |
00431a78 | 1874 | thread_info *tp = inferior_thread (); |
861152be | 1875 | /* Don't try to read from a dead thread. */ |
00431a78 | 1876 | if (tp->state == THREAD_EXITED) |
97916bfe | 1877 | return false; |
d729566a | 1878 | |
861152be | 1879 | /* ... or from a spinning thread. */ |
611841bb | 1880 | if (tp->executing ()) |
97916bfe | 1881 | return false; |
861152be | 1882 | } |
8ea051c5 | 1883 | |
97916bfe | 1884 | return true; |
8ea051c5 PA |
1885 | } |
1886 | ||
79952e69 | 1887 | /* See frame.h. */ |
6e7f8b9c | 1888 | |
9efe17a3 | 1889 | frame_info_ptr |
b04f3ab4 | 1890 | get_selected_frame (const char *message) |
6e7f8b9c | 1891 | { |
206415a3 | 1892 | if (selected_frame == NULL) |
b04f3ab4 | 1893 | { |
8ea051c5 | 1894 | if (message != NULL && !has_stack_frames ()) |
8a3fe4f8 | 1895 | error (("%s"), message); |
79952e69 PA |
1896 | |
1897 | lookup_selected_frame (selected_frame_id, selected_frame_level); | |
b04f3ab4 | 1898 | } |
6e7f8b9c | 1899 | /* There is always a frame. */ |
206415a3 DJ |
1900 | gdb_assert (selected_frame != NULL); |
1901 | return selected_frame; | |
6e7f8b9c AC |
1902 | } |
1903 | ||
bbde78fa | 1904 | /* This is a variant of get_selected_frame() which can be called when |
7dd88986 | 1905 | the inferior does not have a frame; in that case it will return |
bbde78fa | 1906 | NULL instead of calling error(). */ |
7dd88986 | 1907 | |
9efe17a3 | 1908 | frame_info_ptr |
7dd88986 DJ |
1909 | deprecated_safe_get_selected_frame (void) |
1910 | { | |
8ea051c5 | 1911 | if (!has_stack_frames ()) |
7dd88986 | 1912 | return NULL; |
b04f3ab4 | 1913 | return get_selected_frame (NULL); |
7dd88986 DJ |
1914 | } |
1915 | ||
1de4b515 SM |
1916 | /* Invalidate the selected frame. */ |
1917 | ||
1918 | static void | |
1919 | invalidate_selected_frame () | |
1920 | { | |
1921 | selected_frame = nullptr; | |
1922 | selected_frame_level = -1; | |
1923 | selected_frame_id = null_frame_id; | |
1924 | } | |
1925 | ||
1926 | /* See frame.h. */ | |
6e7f8b9c AC |
1927 | |
1928 | void | |
8480a37e | 1929 | select_frame (const frame_info_ptr &fi) |
6e7f8b9c | 1930 | { |
1de4b515 SM |
1931 | gdb_assert (fi != nullptr); |
1932 | ||
206415a3 | 1933 | selected_frame = fi; |
79952e69 | 1934 | selected_frame_level = frame_relative_level (fi); |
bc2cbe81 SM |
1935 | |
1936 | /* If the frame is a user-created one, save its level and frame id just like | |
1937 | any other non-level-0 frame. */ | |
1938 | if (selected_frame_level == 0 && !fi->this_id.value.user_created_p) | |
79952e69 PA |
1939 | { |
1940 | /* Treat the current frame especially -- we want to always | |
1941 | save/restore it without warning, even if the frame ID changes | |
1942 | (see lookup_selected_frame). E.g.: | |
1943 | ||
1944 | // The current frame is selected, the target had just stopped. | |
1945 | { | |
1946 | scoped_restore_selected_frame restore_frame; | |
1947 | some_operation_that_changes_the_stack (); | |
1948 | } | |
1949 | // scoped_restore_selected_frame's dtor runs, but the | |
1950 | // original frame_id can't be found. No matter whether it | |
1951 | // is found or not, we still end up with the now-current | |
1952 | // frame selected. Warning in lookup_selected_frame in this | |
1953 | // case seems pointless. | |
1954 | ||
1955 | Also get_frame_id may access the target's registers/memory, | |
1956 | and thus skipping get_frame_id optimizes the common case. | |
1957 | ||
1958 | Saving the selected frame this way makes get_selected_frame | |
1959 | and restore_current_frame return/re-select whatever frame is | |
1960 | the innermost (current) then. */ | |
1961 | selected_frame_level = -1; | |
1962 | selected_frame_id = null_frame_id; | |
1963 | } | |
1964 | else | |
1965 | selected_frame_id = get_frame_id (fi); | |
1966 | ||
bbde78fa | 1967 | /* NOTE: cagney/2002-05-04: FI can be NULL. This occurs when the |
6e7f8b9c | 1968 | frame is being invalidated. */ |
6e7f8b9c AC |
1969 | |
1970 | /* FIXME: kseitz/2002-08-28: It would be nice to call | |
bbde78fa | 1971 | selected_frame_level_changed_event() right here, but due to limitations |
6e7f8b9c | 1972 | in the current interfaces, we would end up flooding UIs with events |
bbde78fa | 1973 | because select_frame() is used extensively internally. |
6e7f8b9c AC |
1974 | |
1975 | Once we have frame-parameterized frame (and frame-related) commands, | |
1976 | the event notification can be moved here, since this function will only | |
0963b4bd | 1977 | be called when the user's selected frame is being changed. */ |
6e7f8b9c AC |
1978 | |
1979 | /* Ensure that symbols for this frame are read in. Also, determine the | |
1980 | source language of this frame, and switch to it if desired. */ | |
1981 | if (fi) | |
1982 | { | |
e3eebbd7 PA |
1983 | CORE_ADDR pc; |
1984 | ||
1985 | /* We retrieve the frame's symtab by using the frame PC. | |
1986 | However we cannot use the frame PC as-is, because it usually | |
1987 | points to the instruction following the "call", which is | |
1988 | sometimes the first instruction of another function. So we | |
1989 | rely on get_frame_address_in_block() which provides us with a | |
1990 | PC which is guaranteed to be inside the frame's code | |
1991 | block. */ | |
1992 | if (get_frame_address_in_block_if_available (fi, &pc)) | |
6e7f8b9c | 1993 | { |
43f3e411 | 1994 | struct compunit_symtab *cust = find_pc_compunit_symtab (pc); |
e3eebbd7 | 1995 | |
43f3e411 | 1996 | if (cust != NULL |
425d5e76 TT |
1997 | && cust->language () != current_language->la_language |
1998 | && cust->language () != language_unknown | |
e3eebbd7 | 1999 | && language_mode == language_mode_auto) |
425d5e76 | 2000 | set_language (cust->language ()); |
6e7f8b9c AC |
2001 | } |
2002 | } | |
2003 | } | |
e3eebbd7 | 2004 | |
4c1e7e9d AC |
2005 | /* Create an arbitrary (i.e. address specified by user) or innermost frame. |
2006 | Always returns a non-NULL value. */ | |
2007 | ||
d015d320 SM |
2008 | static frame_info_ptr |
2009 | create_new_frame (frame_id id) | |
4c1e7e9d | 2010 | { |
d015d320 SM |
2011 | gdb_assert (id.user_created_p); |
2012 | gdb_assert (id.stack_status == frame_id_stack_status::FID_STACK_VALID); | |
2013 | gdb_assert (id.code_addr_p); | |
4c1e7e9d | 2014 | |
d015d320 SM |
2015 | frame_debug_printf ("stack_addr=%s, core_addr=%s", |
2016 | hex_string (id.stack_addr), hex_string (id.code_addr)); | |
7f78e237 | 2017 | |
f649a718 SM |
2018 | /* Avoid creating duplicate frames, search for an existing frame with that id |
2019 | in the stash. */ | |
f649a718 SM |
2020 | frame_info_ptr frame = frame_stash_find (id); |
2021 | if (frame != nullptr) | |
2022 | return frame; | |
2023 | ||
d015d320 | 2024 | frame_info *fi = FRAME_OBSTACK_ZALLOC (struct frame_info); |
4c1e7e9d | 2025 | |
3e43a32a | 2026 | fi->next = create_sentinel_frame (current_program_space, |
f9582a22 | 2027 | current_inferior ()->aspace.get (), |
9c742269 | 2028 | get_thread_regcache (inferior_thread ()), |
19f98835 | 2029 | id.stack_addr, id.code_addr).get (); |
7df05f2b | 2030 | |
1e275f79 PA |
2031 | /* Set/update this frame's cached PC value, found in the next frame. |
2032 | Do this before looking for this frame's unwinder. A sniffer is | |
2033 | very likely to read this, and the corresponding unwinder is | |
2034 | entitled to rely that the PC doesn't magically change. */ | |
d015d320 | 2035 | fi->next->prev_pc.value = id.code_addr; |
782d47df | 2036 | fi->next->prev_pc.status = CC_VALUE; |
1e275f79 | 2037 | |
6c95b8df PA |
2038 | /* We currently assume that frame chain's can't cross spaces. */ |
2039 | fi->pspace = fi->next->pspace; | |
2040 | fi->aspace = fi->next->aspace; | |
2041 | ||
7df05f2b AC |
2042 | /* Select/initialize both the unwind function and the frame's type |
2043 | based on the PC. */ | |
bd2b40ac | 2044 | frame_unwind_find_by_frame (frame_info_ptr (fi), &fi->prologue_cache); |
7df05f2b | 2045 | |
d19c3068 | 2046 | fi->this_id.p = frame_id_status::COMPUTED; |
f649a718 SM |
2047 | fi->this_id.value = id; |
2048 | ||
2049 | bool added = frame_stash_add (fi); | |
2050 | gdb_assert (added); | |
4c1e7e9d | 2051 | |
a05a883f | 2052 | frame_debug_printf (" -> %s", fi->to_string ().c_str ()); |
7f78e237 | 2053 | |
bd2b40ac | 2054 | return frame_info_ptr (fi); |
4c1e7e9d AC |
2055 | } |
2056 | ||
d015d320 SM |
2057 | frame_info_ptr |
2058 | create_new_frame (CORE_ADDR stack, CORE_ADDR pc) | |
2059 | { | |
2060 | frame_id id = frame_id_build (stack, pc); | |
2061 | id.user_created_p = 1; | |
2062 | ||
2063 | return create_new_frame (id); | |
2064 | } | |
2065 | ||
03febf99 AC |
2066 | /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the |
2067 | innermost frame). Be careful to not fall off the bottom of the | |
2068 | frame chain and onto the sentinel frame. */ | |
4c1e7e9d | 2069 | |
9efe17a3 | 2070 | frame_info_ptr |
8480a37e | 2071 | get_next_frame (const frame_info_ptr &this_frame) |
4c1e7e9d | 2072 | { |
03febf99 | 2073 | if (this_frame->level > 0) |
bd2b40ac | 2074 | return frame_info_ptr (this_frame->next); |
a94dd1fd AC |
2075 | else |
2076 | return NULL; | |
4c1e7e9d AC |
2077 | } |
2078 | ||
df433d31 KB |
2079 | /* Return the frame that THIS_FRAME calls. If THIS_FRAME is the |
2080 | innermost (i.e. current) frame, return the sentinel frame. Thus, | |
2081 | unlike get_next_frame(), NULL will never be returned. */ | |
2082 | ||
9efe17a3 | 2083 | frame_info_ptr |
8480a37e | 2084 | get_next_frame_sentinel_okay (const frame_info_ptr &this_frame) |
df433d31 KB |
2085 | { |
2086 | gdb_assert (this_frame != NULL); | |
2087 | ||
2088 | /* Note that, due to the manner in which the sentinel frame is | |
2089 | constructed, this_frame->next still works even when this_frame | |
2090 | is the sentinel frame. But we disallow it here anyway because | |
2091 | calling get_next_frame_sentinel_okay() on the sentinel frame | |
2092 | is likely a coding error. */ | |
19f98835 SM |
2093 | if (this_frame->this_id.p == frame_id_status::COMPUTED) |
2094 | gdb_assert (!is_sentinel_frame_id (this_frame->this_id.value)); | |
df433d31 | 2095 | |
bd2b40ac | 2096 | return frame_info_ptr (this_frame->next); |
df433d31 KB |
2097 | } |
2098 | ||
f4c5303c OF |
2099 | /* Observer for the target_changed event. */ |
2100 | ||
2c0b251b | 2101 | static void |
f4c5303c OF |
2102 | frame_observer_target_changed (struct target_ops *target) |
2103 | { | |
35f196d9 | 2104 | reinit_frame_cache (); |
f4c5303c OF |
2105 | } |
2106 | ||
4c1e7e9d AC |
2107 | /* Flush the entire frame cache. */ |
2108 | ||
2109 | void | |
35f196d9 | 2110 | reinit_frame_cache (void) |
4c1e7e9d | 2111 | { |
e7bc9db8 PA |
2112 | ++frame_cache_generation; |
2113 | ||
19f98835 | 2114 | if (htab_elements (frame_stash) > 0) |
0d6ba1b1 DJ |
2115 | annotate_frames_invalid (); |
2116 | ||
1de4b515 | 2117 | invalidate_selected_frame (); |
6d3717d4 SM |
2118 | |
2119 | /* Invalidate cache. */ | |
bc32f8e7 SM |
2120 | if (sentinel_frame != nullptr) |
2121 | { | |
2122 | /* If frame 0's id is not computed, it is not in the frame stash, so its | |
3bfdcabb | 2123 | dealloc functions will not be called when emptying the frame stash. |
bc32f8e7 SM |
2124 | Call frame_info_del manually in that case. */ |
2125 | frame_info *current_frame = sentinel_frame->prev; | |
2126 | if (current_frame != nullptr | |
2127 | && current_frame->this_id.p == frame_id_status::NOT_COMPUTED) | |
2128 | frame_info_del (current_frame); | |
2129 | ||
2130 | sentinel_frame = nullptr; | |
2131 | } | |
2132 | ||
b83e9eb7 | 2133 | frame_stash_invalidate (); |
a05a883f | 2134 | |
6d3717d4 SM |
2135 | /* Since we can't really be sure what the first object allocated was. */ |
2136 | obstack_free (&frame_cache_obstack, 0); | |
2137 | obstack_init (&frame_cache_obstack); | |
2138 | ||
ba380b3e TT |
2139 | for (frame_info_ptr &iter : frame_info_ptr::frame_list) |
2140 | iter.invalidate (); | |
2141 | ||
a05a883f | 2142 | frame_debug_printf ("generation=%d", frame_cache_generation); |
4c1e7e9d AC |
2143 | } |
2144 | ||
e48af409 DJ |
2145 | /* Find where a register is saved (in memory or another register). |
2146 | The result of frame_register_unwind is just where it is saved | |
5efde112 | 2147 | relative to this particular frame. */ |
e48af409 DJ |
2148 | |
2149 | static void | |
8480a37e SM |
2150 | frame_register_unwind_location (const frame_info_ptr &initial_this_frame, |
2151 | int regnum, int *optimizedp, lval_type *lvalp, | |
e48af409 DJ |
2152 | CORE_ADDR *addrp, int *realnump) |
2153 | { | |
8480a37e | 2154 | gdb_assert (initial_this_frame == nullptr || initial_this_frame->level >= 0); |
e48af409 | 2155 | |
8480a37e | 2156 | frame_info_ptr this_frame = initial_this_frame; |
e48af409 DJ |
2157 | while (this_frame != NULL) |
2158 | { | |
0fdb4f18 PA |
2159 | int unavailable; |
2160 | ||
2161 | frame_register_unwind (this_frame, regnum, optimizedp, &unavailable, | |
2162 | lvalp, addrp, realnump, NULL); | |
e48af409 DJ |
2163 | |
2164 | if (*optimizedp) | |
2165 | break; | |
2166 | ||
2167 | if (*lvalp != lval_register) | |
2168 | break; | |
2169 | ||
2170 | regnum = *realnump; | |
2171 | this_frame = get_next_frame (this_frame); | |
2172 | } | |
2173 | } | |
2174 | ||
194cca41 PA |
2175 | /* Get the previous raw frame, and check that it is not identical to |
2176 | same other frame frame already in the chain. If it is, there is | |
2177 | most likely a stack cycle, so we discard it, and mark THIS_FRAME as | |
2178 | outermost, with UNWIND_SAME_ID stop reason. Unlike the other | |
2179 | validity tests, that compare THIS_FRAME and the next frame, we do | |
2180 | this right after creating the previous frame, to avoid ever ending | |
275ee935 AB |
2181 | up with two frames with the same id in the frame chain. |
2182 | ||
2183 | There is however, one case where this cycle detection is not desirable, | |
2184 | when asking for the previous frame of an inline frame, in this case, if | |
2185 | the previous frame is a duplicate and we return nullptr then we will be | |
2186 | unable to calculate the frame_id of the inline frame, this in turn | |
2187 | causes inline_frame_this_id() to fail. So for inline frames (and only | |
2188 | for inline frames), the previous frame will always be returned, even when it | |
2189 | has a duplicate frame_id. We're not worried about cycles in the frame | |
2190 | chain as, if the previous frame returned here has a duplicate frame_id, | |
2191 | then the frame_id of the inline frame, calculated based off the frame_id | |
2192 | of the previous frame, should also be a duplicate. */ | |
194cca41 | 2193 | |
9efe17a3 | 2194 | static frame_info_ptr |
8480a37e | 2195 | get_prev_frame_maybe_check_cycle (const frame_info_ptr &this_frame) |
194cca41 | 2196 | { |
bd2b40ac | 2197 | frame_info_ptr prev_frame = get_prev_frame_raw (this_frame); |
f245535c PA |
2198 | |
2199 | /* Don't compute the frame id of the current frame yet. Unwinding | |
2200 | the sentinel frame can fail (e.g., if the thread is gone and we | |
2201 | can't thus read its registers). If we let the cycle detection | |
2202 | code below try to compute a frame ID, then an error thrown from | |
2203 | within the frame ID computation would result in the sentinel | |
2204 | frame as outermost frame, which is bogus. Instead, we'll compute | |
2205 | the current frame's ID lazily in get_frame_id. Note that there's | |
2206 | no point in doing cycle detection when there's only one frame, so | |
2207 | nothing is lost here. */ | |
2208 | if (prev_frame->level == 0) | |
2209 | return prev_frame; | |
194cca41 | 2210 | |
e7bc9db8 PA |
2211 | unsigned int entry_generation = get_frame_cache_generation (); |
2212 | ||
a70b8144 | 2213 | try |
194cca41 | 2214 | { |
09a5e1b5 | 2215 | compute_frame_id (prev_frame); |
275ee935 AB |
2216 | |
2217 | bool cycle_detection_p = get_frame_type (this_frame) != INLINE_FRAME; | |
2218 | ||
2219 | /* This assert checks GDB's state with respect to calculating the | |
2220 | frame-id of THIS_FRAME, in the case where THIS_FRAME is an inline | |
2221 | frame. | |
2222 | ||
2223 | If THIS_FRAME is frame #0, and is an inline frame, then we put off | |
2224 | calculating the frame_id until we specifically make a call to | |
2225 | get_frame_id(). As a result we can enter this function in two | |
2226 | possible states. If GDB asked for the previous frame of frame #0 | |
2227 | then THIS_FRAME will be frame #0 (an inline frame), and the | |
2228 | frame_id will be in the NOT_COMPUTED state. However, if GDB asked | |
2229 | for the frame_id of frame #0, then, as getting the frame_id of an | |
2230 | inline frame requires us to get the frame_id of the previous | |
2231 | frame, we will still end up in here, and the frame_id status will | |
2232 | be COMPUTING. | |
2233 | ||
2234 | If, instead, THIS_FRAME is at a level greater than #0 then things | |
2235 | are simpler. For these frames we immediately compute the frame_id | |
2236 | when the frame is initially created, and so, for those frames, we | |
2237 | will always enter this function with the frame_id status of | |
2238 | COMPUTING. */ | |
2239 | gdb_assert (cycle_detection_p | |
2240 | || (this_frame->level > 0 | |
2241 | && (this_frame->this_id.p | |
2242 | == frame_id_status::COMPUTING)) | |
2243 | || (this_frame->level == 0 | |
2244 | && (this_frame->this_id.p | |
2245 | != frame_id_status::COMPUTED))); | |
2246 | ||
2247 | /* We must do the CYCLE_DETECTION_P check after attempting to add | |
2248 | PREV_FRAME into the cache; if PREV_FRAME is unique then we do want | |
2249 | it in the cache, but if it is a duplicate and CYCLE_DETECTION_P is | |
2250 | false, then we don't want to unlink it. */ | |
bd2b40ac | 2251 | if (!frame_stash_add (prev_frame.get ()) && cycle_detection_p) |
938f0e2f | 2252 | { |
09a5e1b5 TT |
2253 | /* Another frame with the same id was already in the stash. We just |
2254 | detected a cycle. */ | |
a05a883f SM |
2255 | frame_debug_printf (" -> nullptr // this frame has same ID"); |
2256 | ||
09a5e1b5 TT |
2257 | this_frame->stop_reason = UNWIND_SAME_ID; |
2258 | /* Unlink. */ | |
2259 | prev_frame->next = NULL; | |
2260 | this_frame->prev = NULL; | |
2261 | prev_frame = NULL; | |
938f0e2f | 2262 | } |
09a5e1b5 | 2263 | } |
230d2906 | 2264 | catch (const gdb_exception &ex) |
09a5e1b5 | 2265 | { |
e7bc9db8 PA |
2266 | if (get_frame_cache_generation () == entry_generation) |
2267 | { | |
2268 | prev_frame->next = NULL; | |
2269 | this_frame->prev = NULL; | |
2270 | } | |
09a5e1b5 | 2271 | |
eedc3f4f | 2272 | throw; |
194cca41 | 2273 | } |
938f0e2f | 2274 | |
938f0e2f | 2275 | return prev_frame; |
194cca41 PA |
2276 | } |
2277 | ||
53e8a631 AB |
2278 | /* Helper function for get_prev_frame_always, this is called inside a |
2279 | TRY_CATCH block. Return the frame that called THIS_FRAME or NULL if | |
2280 | there is no such frame. This may throw an exception. */ | |
eb4f72c5 | 2281 | |
9efe17a3 | 2282 | static frame_info_ptr |
8480a37e | 2283 | get_prev_frame_always_1 (const frame_info_ptr &this_frame) |
eb4f72c5 | 2284 | { |
fe67a58f | 2285 | FRAME_SCOPED_DEBUG_ENTER_EXIT; |
eb4f72c5 | 2286 | |
5613d8d3 AC |
2287 | gdb_assert (this_frame != NULL); |
2288 | ||
7f78e237 AC |
2289 | if (frame_debug) |
2290 | { | |
7f78e237 | 2291 | if (this_frame != NULL) |
a05a883f | 2292 | frame_debug_printf ("this_frame=%d", this_frame->level); |
7f78e237 | 2293 | else |
a05a883f | 2294 | frame_debug_printf ("this_frame=nullptr"); |
7f78e237 AC |
2295 | } |
2296 | ||
fe67a58f SM |
2297 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
2298 | ||
5613d8d3 AC |
2299 | /* Only try to do the unwind once. */ |
2300 | if (this_frame->prev_p) | |
2301 | { | |
ca89bdf8 AB |
2302 | if (this_frame->prev != nullptr) |
2303 | frame_debug_printf (" -> %s // cached", | |
2304 | this_frame->prev->to_string ().c_str ()); | |
2305 | else | |
2306 | frame_debug_printf | |
2307 | (" -> nullptr // %s // cached", | |
2308 | frame_stop_reason_symbol_string (this_frame->stop_reason)); | |
bd2b40ac | 2309 | return frame_info_ptr (this_frame->prev); |
5613d8d3 | 2310 | } |
8fa75a5d | 2311 | |
0d254d6f DJ |
2312 | /* If the frame unwinder hasn't been selected yet, we must do so |
2313 | before setting prev_p; otherwise the check for misbehaved | |
2314 | sniffers will think that this frame's sniffer tried to unwind | |
2315 | further (see frame_cleanup_after_sniffer). */ | |
2316 | if (this_frame->unwind == NULL) | |
9f9a8002 | 2317 | frame_unwind_find_by_frame (this_frame, &this_frame->prologue_cache); |
8fa75a5d | 2318 | |
97916bfe | 2319 | this_frame->prev_p = true; |
55feb689 | 2320 | this_frame->stop_reason = UNWIND_NO_REASON; |
5613d8d3 | 2321 | |
edb3359d DJ |
2322 | /* If we are unwinding from an inline frame, all of the below tests |
2323 | were already performed when we unwound from the next non-inline | |
2324 | frame. We must skip them, since we can not get THIS_FRAME's ID | |
2325 | until we have unwound all the way down to the previous non-inline | |
2326 | frame. */ | |
2327 | if (get_frame_type (this_frame) == INLINE_FRAME) | |
275ee935 | 2328 | return get_prev_frame_maybe_check_cycle (this_frame); |
edb3359d | 2329 | |
2b3cb400 PA |
2330 | /* If this_frame is the current frame, then compute and stash its |
2331 | frame id prior to fetching and computing the frame id of the | |
2332 | previous frame. Otherwise, the cycle detection code in | |
2333 | get_prev_frame_if_no_cycle() will not work correctly. When | |
2334 | get_frame_id() is called later on, an assertion error will be | |
2335 | triggered in the event of a cycle between the current frame and | |
2336 | its previous frame. | |
2337 | ||
2338 | Note we do this after the INLINE_FRAME check above. That is | |
2339 | because the inline frame's frame id computation needs to fetch | |
2340 | the frame id of its previous real stack frame. I.e., we need to | |
2341 | avoid recursion in that case. This is OK since we're sure the | |
2342 | inline frame won't create a cycle with the real stack frame. See | |
2343 | inline_frame_this_id. */ | |
2344 | if (this_frame->level == 0) | |
2345 | get_frame_id (this_frame); | |
2346 | ||
8fbca658 PA |
2347 | /* Check that this frame is unwindable. If it isn't, don't try to |
2348 | unwind to the prev frame. */ | |
2349 | this_frame->stop_reason | |
2350 | = this_frame->unwind->stop_reason (this_frame, | |
2351 | &this_frame->prologue_cache); | |
2352 | ||
2353 | if (this_frame->stop_reason != UNWIND_NO_REASON) | |
a7300869 | 2354 | { |
a05a883f SM |
2355 | frame_debug_printf |
2356 | (" -> nullptr // %s", | |
2357 | frame_stop_reason_symbol_string (this_frame->stop_reason)); | |
a7300869 PA |
2358 | return NULL; |
2359 | } | |
8fbca658 | 2360 | |
5613d8d3 AC |
2361 | /* Check that this frame's ID isn't inner to (younger, below, next) |
2362 | the next frame. This happens when a frame unwind goes backwards. | |
f06eadd9 JB |
2363 | This check is valid only if this frame and the next frame are NORMAL. |
2364 | See the comment at frame_id_inner for details. */ | |
2365 | if (get_frame_type (this_frame) == NORMAL_FRAME | |
2366 | && this_frame->next->unwind->type == NORMAL_FRAME | |
bd2b40ac | 2367 | && frame_id_inner (get_frame_arch (frame_info_ptr (this_frame->next)), |
da361ebd | 2368 | get_frame_id (this_frame), |
bd2b40ac | 2369 | get_frame_id (frame_info_ptr (this_frame->next)))) |
55feb689 | 2370 | { |
ebedcab5 JK |
2371 | CORE_ADDR this_pc_in_block; |
2372 | struct minimal_symbol *morestack_msym; | |
2373 | const char *morestack_name = NULL; | |
e512699a | 2374 | |
ebedcab5 JK |
2375 | /* gcc -fsplit-stack __morestack can continue the stack anywhere. */ |
2376 | this_pc_in_block = get_frame_address_in_block (this_frame); | |
7cbd4a93 | 2377 | morestack_msym = lookup_minimal_symbol_by_pc (this_pc_in_block).minsym; |
ebedcab5 | 2378 | if (morestack_msym) |
c9d95fa3 | 2379 | morestack_name = morestack_msym->linkage_name (); |
ebedcab5 | 2380 | if (!morestack_name || strcmp (morestack_name, "__morestack") != 0) |
55feb689 | 2381 | { |
a05a883f | 2382 | frame_debug_printf (" -> nullptr // this frame ID is inner"); |
ebedcab5 JK |
2383 | this_frame->stop_reason = UNWIND_INNER_ID; |
2384 | return NULL; | |
55feb689 | 2385 | } |
55feb689 | 2386 | } |
5613d8d3 | 2387 | |
e48af409 DJ |
2388 | /* Check that this and the next frame do not unwind the PC register |
2389 | to the same memory location. If they do, then even though they | |
2390 | have different frame IDs, the new frame will be bogus; two | |
2391 | functions can't share a register save slot for the PC. This can | |
2392 | happen when the prologue analyzer finds a stack adjustment, but | |
d57df5e4 DJ |
2393 | no PC save. |
2394 | ||
2395 | This check does assume that the "PC register" is roughly a | |
2396 | traditional PC, even if the gdbarch_unwind_pc method adjusts | |
2397 | it (we do not rely on the value, only on the unwound PC being | |
2398 | dependent on this value). A potential improvement would be | |
2399 | to have the frame prev_pc method and the gdbarch unwind_pc | |
2400 | method set the same lval and location information as | |
2401 | frame_register_unwind. */ | |
e48af409 | 2402 | if (this_frame->level > 0 |
b1bd0044 | 2403 | && gdbarch_pc_regnum (gdbarch) >= 0 |
e48af409 | 2404 | && get_frame_type (this_frame) == NORMAL_FRAME |
bd2b40ac TT |
2405 | && (get_frame_type (frame_info_ptr (this_frame->next)) == NORMAL_FRAME |
2406 | || get_frame_type (frame_info_ptr (this_frame->next)) == INLINE_FRAME)) | |
e48af409 | 2407 | { |
32276632 | 2408 | int optimized, realnum, nrealnum; |
e48af409 DJ |
2409 | enum lval_type lval, nlval; |
2410 | CORE_ADDR addr, naddr; | |
2411 | ||
3e8c568d | 2412 | frame_register_unwind_location (this_frame, |
b1bd0044 | 2413 | gdbarch_pc_regnum (gdbarch), |
3e8c568d UW |
2414 | &optimized, &lval, &addr, &realnum); |
2415 | frame_register_unwind_location (get_next_frame (this_frame), | |
b1bd0044 | 2416 | gdbarch_pc_regnum (gdbarch), |
32276632 | 2417 | &optimized, &nlval, &naddr, &nrealnum); |
e48af409 | 2418 | |
32276632 DJ |
2419 | if ((lval == lval_memory && lval == nlval && addr == naddr) |
2420 | || (lval == lval_register && lval == nlval && realnum == nrealnum)) | |
e48af409 | 2421 | { |
a05a883f | 2422 | frame_debug_printf (" -> nullptr // no saved PC"); |
e48af409 DJ |
2423 | this_frame->stop_reason = UNWIND_NO_SAVED_PC; |
2424 | this_frame->prev = NULL; | |
2425 | return NULL; | |
2426 | } | |
2427 | } | |
2428 | ||
5eb2254a AB |
2429 | /* Ensure we can unwind the program counter of THIS_FRAME. */ |
2430 | try | |
2431 | { | |
2432 | /* Calling frame_unwind_pc for the sentinel frame relies on the | |
2433 | current_frame being set, which at this point it might not be if we | |
2434 | are in the process of setting the current_frame after a stop (see | |
2435 | get_current_frame). | |
2436 | ||
2437 | The point of this check is to ensure that the unwinder for | |
2438 | THIS_FRAME can actually unwind the $pc, which we assume the | |
2439 | sentinel frame unwinder can always do (it's just a read from the | |
2440 | machine state), so we only call frame_unwind_pc for frames other | |
2441 | than the sentinel (level -1) frame. | |
2442 | ||
2443 | Additionally, we don't actually care about the value of the | |
2444 | unwound $pc, just that the call completed successfully. */ | |
2445 | if (this_frame->level >= 0) | |
2446 | frame_unwind_pc (this_frame); | |
2447 | } | |
2448 | catch (const gdb_exception_error &ex) | |
2449 | { | |
2450 | if (ex.error == NOT_AVAILABLE_ERROR || ex.error == OPTIMIZED_OUT_ERROR) | |
2451 | { | |
2452 | frame_debug_printf (" -> nullptr // no saved PC"); | |
2453 | this_frame->stop_reason = UNWIND_NO_SAVED_PC; | |
2454 | this_frame->prev = nullptr; | |
2455 | return nullptr; | |
2456 | } | |
2457 | ||
2458 | throw; | |
2459 | } | |
2460 | ||
275ee935 | 2461 | return get_prev_frame_maybe_check_cycle (this_frame); |
edb3359d DJ |
2462 | } |
2463 | ||
53e8a631 AB |
2464 | /* Return a "struct frame_info" corresponding to the frame that called |
2465 | THIS_FRAME. Returns NULL if there is no such frame. | |
2466 | ||
2467 | Unlike get_prev_frame, this function always tries to unwind the | |
2468 | frame. */ | |
2469 | ||
9efe17a3 | 2470 | frame_info_ptr |
8480a37e | 2471 | get_prev_frame_always (const frame_info_ptr &this_frame) |
53e8a631 | 2472 | { |
bd2b40ac | 2473 | frame_info_ptr prev_frame = NULL; |
53e8a631 | 2474 | |
a70b8144 | 2475 | try |
53e8a631 AB |
2476 | { |
2477 | prev_frame = get_prev_frame_always_1 (this_frame); | |
2478 | } | |
230d2906 | 2479 | catch (const gdb_exception_error &ex) |
53e8a631 AB |
2480 | { |
2481 | if (ex.error == MEMORY_ERROR) | |
2482 | { | |
2483 | this_frame->stop_reason = UNWIND_MEMORY_ERROR; | |
2484 | if (ex.message != NULL) | |
2485 | { | |
2486 | char *stop_string; | |
2487 | size_t size; | |
2488 | ||
2489 | /* The error needs to live as long as the frame does. | |
dda83cd7 SM |
2490 | Allocate using stack local STOP_STRING then assign the |
2491 | pointer to the frame, this allows the STOP_STRING on the | |
2492 | frame to be of type 'const char *'. */ | |
3d6e9d23 | 2493 | size = ex.message->size () + 1; |
224c3ddb | 2494 | stop_string = (char *) frame_obstack_zalloc (size); |
3d6e9d23 | 2495 | memcpy (stop_string, ex.what (), size); |
53e8a631 AB |
2496 | this_frame->stop_string = stop_string; |
2497 | } | |
2498 | prev_frame = NULL; | |
2499 | } | |
2500 | else | |
eedc3f4f | 2501 | throw; |
53e8a631 AB |
2502 | } |
2503 | ||
2504 | return prev_frame; | |
2505 | } | |
2506 | ||
edb3359d DJ |
2507 | /* Construct a new "struct frame_info" and link it previous to |
2508 | this_frame. */ | |
2509 | ||
9efe17a3 | 2510 | static frame_info_ptr |
8480a37e | 2511 | get_prev_frame_raw (const frame_info_ptr &this_frame) |
edb3359d | 2512 | { |
bd2b40ac | 2513 | frame_info *prev_frame; |
edb3359d | 2514 | |
5613d8d3 AC |
2515 | /* Allocate the new frame but do not wire it in to the frame chain. |
2516 | Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along | |
2517 | frame->next to pull some fancy tricks (of course such code is, by | |
2518 | definition, recursive). Try to prevent it. | |
2519 | ||
2520 | There is no reason to worry about memory leaks, should the | |
2521 | remainder of the function fail. The allocated memory will be | |
2522 | quickly reclaimed when the frame cache is flushed, and the `we've | |
2523 | been here before' check above will stop repeated memory | |
2524 | allocation calls. */ | |
2525 | prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info); | |
2526 | prev_frame->level = this_frame->level + 1; | |
2527 | ||
6c95b8df PA |
2528 | /* For now, assume we don't have frame chains crossing address |
2529 | spaces. */ | |
2530 | prev_frame->pspace = this_frame->pspace; | |
2531 | prev_frame->aspace = this_frame->aspace; | |
2532 | ||
5613d8d3 AC |
2533 | /* Don't yet compute ->unwind (and hence ->type). It is computed |
2534 | on-demand in get_frame_type, frame_register_unwind, and | |
2535 | get_frame_id. */ | |
2536 | ||
2537 | /* Don't yet compute the frame's ID. It is computed on-demand by | |
2538 | get_frame_id(). */ | |
2539 | ||
2540 | /* The unwound frame ID is validate at the start of this function, | |
2541 | as part of the logic to decide if that frame should be further | |
2542 | unwound, and not here while the prev frame is being created. | |
2543 | Doing this makes it possible for the user to examine a frame that | |
2544 | has an invalid frame ID. | |
2545 | ||
2546 | Some very old VAX code noted: [...] For the sake of argument, | |
2547 | suppose that the stack is somewhat trashed (which is one reason | |
2548 | that "info frame" exists). So, return 0 (indicating we don't | |
2549 | know the address of the arglist) if we don't know what frame this | |
2550 | frame calls. */ | |
2551 | ||
2552 | /* Link it in. */ | |
2553 | this_frame->prev = prev_frame; | |
bd2b40ac | 2554 | prev_frame->next = this_frame.get (); |
5613d8d3 | 2555 | |
a05a883f | 2556 | frame_debug_printf (" -> %s", prev_frame->to_string ().c_str ()); |
5613d8d3 | 2557 | |
bd2b40ac | 2558 | return frame_info_ptr (prev_frame); |
5613d8d3 AC |
2559 | } |
2560 | ||
2561 | /* Debug routine to print a NULL frame being returned. */ | |
2562 | ||
2563 | static void | |
8480a37e | 2564 | frame_debug_got_null_frame (const frame_info_ptr &this_frame, |
5613d8d3 AC |
2565 | const char *reason) |
2566 | { | |
2567 | if (frame_debug) | |
2568 | { | |
5613d8d3 | 2569 | if (this_frame != NULL) |
a05a883f | 2570 | frame_debug_printf ("this_frame=%d -> %s", this_frame->level, reason); |
5613d8d3 | 2571 | else |
a05a883f | 2572 | frame_debug_printf ("this_frame=nullptr -> %s", reason); |
5613d8d3 AC |
2573 | } |
2574 | } | |
2575 | ||
c8cd9f6c AC |
2576 | /* Is this (non-sentinel) frame in the "main"() function? */ |
2577 | ||
97916bfe | 2578 | static bool |
8480a37e | 2579 | inside_main_func (const frame_info_ptr &this_frame) |
c8cd9f6c | 2580 | { |
a42d7dd8 | 2581 | if (current_program_space->symfile_object_file == nullptr) |
97916bfe SM |
2582 | return false; |
2583 | ||
5d49758d | 2584 | CORE_ADDR sym_addr = 0; |
9370fd51 | 2585 | const char *name = main_name (); |
97916bfe | 2586 | bound_minimal_symbol msymbol |
a42d7dd8 TT |
2587 | = lookup_minimal_symbol (name, NULL, |
2588 | current_program_space->symfile_object_file); | |
571eb264 RB |
2589 | |
2590 | if (msymbol.minsym != nullptr) | |
2591 | sym_addr = msymbol.value_address (); | |
2592 | ||
2593 | /* Favor a full symbol in Fortran, for the case where the Fortran main | |
2594 | is also called "main". */ | |
2595 | if (msymbol.minsym == nullptr | |
2596 | || get_frame_language (this_frame) == language_fortran) | |
9370fd51 AB |
2597 | { |
2598 | /* In some language (for example Fortran) there will be no minimal | |
2599 | symbol with the name of the main function. In this case we should | |
2600 | search the full symbols to see if we can find a match. */ | |
ccf41c24 | 2601 | struct block_symbol bs = lookup_symbol (name, nullptr, |
e11de080 | 2602 | SEARCH_FUNCTION_DOMAIN, nullptr); |
9370fd51 | 2603 | |
e11de080 | 2604 | /* This lookup should always yield a block-valued symbol. */ |
571eb264 RB |
2605 | if (bs.symbol != nullptr && bs.symbol->aclass () == LOC_BLOCK) |
2606 | { | |
2607 | const struct block *block = bs.symbol->value_block (); | |
2608 | gdb_assert (block != nullptr); | |
2609 | sym_addr = block->start (); | |
2610 | } | |
2611 | else if (msymbol.minsym == nullptr) | |
5f056fcb | 2612 | return false; |
9370fd51 | 2613 | } |
c8cd9f6c | 2614 | |
9370fd51 AB |
2615 | /* Convert any function descriptor addresses into the actual function |
2616 | code address. */ | |
5d49758d TT |
2617 | sym_addr = (gdbarch_convert_from_func_ptr_addr |
2618 | (get_frame_arch (this_frame), sym_addr, | |
2619 | current_inferior ()->top_target ())); | |
97916bfe | 2620 | |
9370fd51 | 2621 | return sym_addr == get_frame_func (this_frame); |
c8cd9f6c AC |
2622 | } |
2623 | ||
2315ffec RC |
2624 | /* Test whether THIS_FRAME is inside the process entry point function. */ |
2625 | ||
97916bfe | 2626 | static bool |
8480a37e | 2627 | inside_entry_func (const frame_info_ptr &this_frame) |
2315ffec | 2628 | { |
abd0a5fa JK |
2629 | CORE_ADDR entry_point; |
2630 | ||
2631 | if (!entry_point_address_query (&entry_point)) | |
97916bfe | 2632 | return false; |
abd0a5fa JK |
2633 | |
2634 | return get_frame_func (this_frame) == entry_point; | |
2315ffec RC |
2635 | } |
2636 | ||
5613d8d3 | 2637 | /* Return a structure containing various interesting information about |
3f33695b | 2638 | the frame that called THIS_FRAME. Returns NULL if there is either |
5613d8d3 AC |
2639 | no such frame or the frame fails any of a set of target-independent |
2640 | condition that should terminate the frame chain (e.g., as unwinding | |
2641 | past main()). | |
2642 | ||
2643 | This function should not contain target-dependent tests, such as | |
2644 | checking whether the program-counter is zero. */ | |
2645 | ||
9efe17a3 | 2646 | frame_info_ptr |
8480a37e | 2647 | get_prev_frame (const frame_info_ptr &this_frame) |
5613d8d3 | 2648 | { |
fe67a58f SM |
2649 | FRAME_SCOPED_DEBUG_ENTER_EXIT; |
2650 | ||
e3eebbd7 PA |
2651 | CORE_ADDR frame_pc; |
2652 | int frame_pc_p; | |
2653 | ||
eb4f72c5 AC |
2654 | /* There is always a frame. If this assertion fails, suspect that |
2655 | something should be calling get_selected_frame() or | |
2656 | get_current_frame(). */ | |
03febf99 | 2657 | gdb_assert (this_frame != NULL); |
256ae5db | 2658 | |
e3eebbd7 | 2659 | frame_pc_p = get_frame_pc_if_available (this_frame, &frame_pc); |
eb4f72c5 | 2660 | |
cc9bed83 RC |
2661 | /* tausq/2004-12-07: Dummy frames are skipped because it doesn't make much |
2662 | sense to stop unwinding at a dummy frame. One place where a dummy | |
2663 | frame may have an address "inside_main_func" is on HPUX. On HPUX, the | |
2664 | pcsqh register (space register for the instruction at the head of the | |
2665 | instruction queue) cannot be written directly; the only way to set it | |
2666 | is to branch to code that is in the target space. In order to implement | |
e512699a SV |
2667 | frame dummies on HPUX, the called function is made to jump back to where |
2668 | the inferior was when the user function was called. If gdb was inside | |
2669 | the main function when we created the dummy frame, the dummy frame will | |
cc9bed83 | 2670 | point inside the main function. */ |
03febf99 | 2671 | if (this_frame->level >= 0 |
edb3359d | 2672 | && get_frame_type (this_frame) == NORMAL_FRAME |
d4c16835 | 2673 | && !user_set_backtrace_options.backtrace_past_main |
e3eebbd7 | 2674 | && frame_pc_p |
c8cd9f6c AC |
2675 | && inside_main_func (this_frame)) |
2676 | /* Don't unwind past main(). Note, this is done _before_ the | |
2677 | frame has been marked as previously unwound. That way if the | |
2678 | user later decides to enable unwinds past main(), that will | |
2679 | automatically happen. */ | |
ac2bd0a9 | 2680 | { |
d2bf72c0 | 2681 | frame_debug_got_null_frame (this_frame, "inside main func"); |
ac2bd0a9 AC |
2682 | return NULL; |
2683 | } | |
eb4f72c5 | 2684 | |
4a5e53e8 DJ |
2685 | /* If the user's backtrace limit has been exceeded, stop. We must |
2686 | add two to the current level; one of those accounts for backtrace_limit | |
2687 | being 1-based and the level being 0-based, and the other accounts for | |
2688 | the level of the new frame instead of the level of the current | |
2689 | frame. */ | |
d4c16835 | 2690 | if (this_frame->level + 2 > user_set_backtrace_options.backtrace_limit) |
25d29d70 | 2691 | { |
d2bf72c0 | 2692 | frame_debug_got_null_frame (this_frame, "backtrace limit exceeded"); |
4a5e53e8 | 2693 | return NULL; |
25d29d70 AC |
2694 | } |
2695 | ||
0714963c AC |
2696 | /* If we're already inside the entry function for the main objfile, |
2697 | then it isn't valid. Don't apply this test to a dummy frame - | |
bbde78fa | 2698 | dummy frame PCs typically land in the entry func. Don't apply |
0714963c AC |
2699 | this test to the sentinel frame. Sentinel frames should always |
2700 | be allowed to unwind. */ | |
2f72f850 AC |
2701 | /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func() - |
2702 | wasn't checking for "main" in the minimal symbols. With that | |
2703 | fixed asm-source tests now stop in "main" instead of halting the | |
bbde78fa | 2704 | backtrace in weird and wonderful ways somewhere inside the entry |
2f72f850 AC |
2705 | file. Suspect that tests for inside the entry file/func were |
2706 | added to work around that (now fixed) case. */ | |
0714963c AC |
2707 | /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right) |
2708 | suggested having the inside_entry_func test use the | |
bbde78fa JM |
2709 | inside_main_func() msymbol trick (along with entry_point_address() |
2710 | I guess) to determine the address range of the start function. | |
0714963c AC |
2711 | That should provide a far better stopper than the current |
2712 | heuristics. */ | |
2315ffec | 2713 | /* NOTE: tausq/2004-10-09: this is needed if, for example, the compiler |
e512699a | 2714 | applied tail-call optimizations to main so that a function called |
2315ffec RC |
2715 | from main returns directly to the caller of main. Since we don't |
2716 | stop at main, we should at least stop at the entry point of the | |
2717 | application. */ | |
edb3359d DJ |
2718 | if (this_frame->level >= 0 |
2719 | && get_frame_type (this_frame) == NORMAL_FRAME | |
d4c16835 | 2720 | && !user_set_backtrace_options.backtrace_past_entry |
e3eebbd7 | 2721 | && frame_pc_p |
6e4c6c91 | 2722 | && inside_entry_func (this_frame)) |
0714963c | 2723 | { |
d2bf72c0 | 2724 | frame_debug_got_null_frame (this_frame, "inside entry func"); |
0714963c AC |
2725 | return NULL; |
2726 | } | |
2727 | ||
39ee2ff0 AC |
2728 | /* Assume that the only way to get a zero PC is through something |
2729 | like a SIGSEGV or a dummy frame, and hence that NORMAL frames | |
2730 | will never unwind a zero PC. */ | |
2731 | if (this_frame->level > 0 | |
edb3359d DJ |
2732 | && (get_frame_type (this_frame) == NORMAL_FRAME |
2733 | || get_frame_type (this_frame) == INLINE_FRAME) | |
39ee2ff0 | 2734 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME |
e3eebbd7 | 2735 | && frame_pc_p && frame_pc == 0) |
39ee2ff0 | 2736 | { |
d2bf72c0 | 2737 | frame_debug_got_null_frame (this_frame, "zero PC"); |
39ee2ff0 AC |
2738 | return NULL; |
2739 | } | |
2740 | ||
51d48146 | 2741 | return get_prev_frame_always (this_frame); |
eb4f72c5 AC |
2742 | } |
2743 | ||
4c1e7e9d | 2744 | CORE_ADDR |
8480a37e | 2745 | get_frame_pc (const frame_info_ptr &frame) |
4c1e7e9d | 2746 | { |
d1340264 | 2747 | gdb_assert (frame->next != NULL); |
bd2b40ac | 2748 | return frame_unwind_pc (frame_info_ptr (frame->next)); |
4c1e7e9d AC |
2749 | } |
2750 | ||
97916bfe | 2751 | bool |
8480a37e | 2752 | get_frame_pc_if_available (const frame_info_ptr &frame, CORE_ADDR *pc) |
e3eebbd7 | 2753 | { |
e3eebbd7 PA |
2754 | |
2755 | gdb_assert (frame->next != NULL); | |
2756 | ||
a70b8144 | 2757 | try |
e3eebbd7 | 2758 | { |
bd2b40ac | 2759 | *pc = frame_unwind_pc (frame_info_ptr (frame->next)); |
e3eebbd7 | 2760 | } |
230d2906 | 2761 | catch (const gdb_exception_error &ex) |
e3eebbd7 PA |
2762 | { |
2763 | if (ex.error == NOT_AVAILABLE_ERROR) | |
97916bfe | 2764 | return false; |
e3eebbd7 | 2765 | else |
eedc3f4f | 2766 | throw; |
e3eebbd7 PA |
2767 | } |
2768 | ||
97916bfe | 2769 | return true; |
e3eebbd7 PA |
2770 | } |
2771 | ||
ad1193e7 | 2772 | /* Return an address that falls within THIS_FRAME's code block. */ |
8edd5d01 AC |
2773 | |
2774 | CORE_ADDR | |
8480a37e | 2775 | get_frame_address_in_block (const frame_info_ptr &this_frame) |
8edd5d01 AC |
2776 | { |
2777 | /* A draft address. */ | |
ad1193e7 | 2778 | CORE_ADDR pc = get_frame_pc (this_frame); |
8edd5d01 | 2779 | |
bd2b40ac | 2780 | frame_info_ptr next_frame (this_frame->next); |
ad1193e7 DJ |
2781 | |
2782 | /* Calling get_frame_pc returns the resume address for THIS_FRAME. | |
2783 | Normally the resume address is inside the body of the function | |
2784 | associated with THIS_FRAME, but there is a special case: when | |
2785 | calling a function which the compiler knows will never return | |
2786 | (for instance abort), the call may be the very last instruction | |
2787 | in the calling function. The resume address will point after the | |
2788 | call and may be at the beginning of a different function | |
2789 | entirely. | |
2790 | ||
2791 | If THIS_FRAME is a signal frame or dummy frame, then we should | |
2792 | not adjust the unwound PC. For a dummy frame, GDB pushed the | |
2793 | resume address manually onto the stack. For a signal frame, the | |
2794 | OS may have pushed the resume address manually and invoked the | |
2795 | handler (e.g. GNU/Linux), or invoked the trampoline which called | |
2796 | the signal handler - but in either case the signal handler is | |
2797 | expected to return to the trampoline. So in both of these | |
2798 | cases we know that the resume address is executable and | |
2799 | related. So we only need to adjust the PC if THIS_FRAME | |
2800 | is a normal function. | |
2801 | ||
2802 | If the program has been interrupted while THIS_FRAME is current, | |
2803 | then clearly the resume address is inside the associated | |
2804 | function. There are three kinds of interruption: debugger stop | |
2805 | (next frame will be SENTINEL_FRAME), operating system | |
2806 | signal or exception (next frame will be SIGTRAMP_FRAME), | |
2807 | or debugger-induced function call (next frame will be | |
2808 | DUMMY_FRAME). So we only need to adjust the PC if | |
2809 | NEXT_FRAME is a normal function. | |
2810 | ||
2811 | We check the type of NEXT_FRAME first, since it is already | |
2812 | known; frame type is determined by the unwinder, and since | |
2813 | we have THIS_FRAME we've already selected an unwinder for | |
edb3359d DJ |
2814 | NEXT_FRAME. |
2815 | ||
2816 | If the next frame is inlined, we need to keep going until we find | |
2817 | the real function - for instance, if a signal handler is invoked | |
2818 | while in an inlined function, then the code address of the | |
2819 | "calling" normal function should not be adjusted either. */ | |
2820 | ||
2821 | while (get_frame_type (next_frame) == INLINE_FRAME) | |
bd2b40ac | 2822 | next_frame = frame_info_ptr (next_frame->next); |
edb3359d | 2823 | |
111c6489 JK |
2824 | if ((get_frame_type (next_frame) == NORMAL_FRAME |
2825 | || get_frame_type (next_frame) == TAILCALL_FRAME) | |
edb3359d | 2826 | && (get_frame_type (this_frame) == NORMAL_FRAME |
111c6489 | 2827 | || get_frame_type (this_frame) == TAILCALL_FRAME |
edb3359d | 2828 | || get_frame_type (this_frame) == INLINE_FRAME)) |
ad1193e7 DJ |
2829 | return pc - 1; |
2830 | ||
2831 | return pc; | |
8edd5d01 AC |
2832 | } |
2833 | ||
97916bfe | 2834 | bool |
8480a37e | 2835 | get_frame_address_in_block_if_available (const frame_info_ptr &this_frame, |
e3eebbd7 PA |
2836 | CORE_ADDR *pc) |
2837 | { | |
e3eebbd7 | 2838 | |
a70b8144 | 2839 | try |
e3eebbd7 PA |
2840 | { |
2841 | *pc = get_frame_address_in_block (this_frame); | |
2842 | } | |
230d2906 | 2843 | catch (const gdb_exception_error &ex) |
7556d4a4 PA |
2844 | { |
2845 | if (ex.error == NOT_AVAILABLE_ERROR) | |
97916bfe | 2846 | return false; |
eedc3f4f | 2847 | throw; |
7556d4a4 PA |
2848 | } |
2849 | ||
97916bfe | 2850 | return true; |
e3eebbd7 PA |
2851 | } |
2852 | ||
51abb421 | 2853 | symtab_and_line |
8480a37e | 2854 | find_frame_sal (const frame_info_ptr &frame) |
1058bca7 | 2855 | { |
bd2b40ac | 2856 | frame_info_ptr next_frame; |
edb3359d | 2857 | int notcurrent; |
e3eebbd7 | 2858 | CORE_ADDR pc; |
edb3359d | 2859 | |
edb3359d DJ |
2860 | if (frame_inlined_callees (frame) > 0) |
2861 | { | |
2862 | struct symbol *sym; | |
2863 | ||
7ffa82e1 AB |
2864 | /* If the current frame has some inlined callees, and we have a next |
2865 | frame, then that frame must be an inlined frame. In this case | |
2866 | this frame's sal is the "call site" of the next frame's inlined | |
2867 | function, which can not be inferred from get_frame_pc. */ | |
2868 | next_frame = get_next_frame (frame); | |
edb3359d DJ |
2869 | if (next_frame) |
2870 | sym = get_frame_function (next_frame); | |
2871 | else | |
00431a78 | 2872 | sym = inline_skipped_symbol (inferior_thread ()); |
edb3359d | 2873 | |
f3df5b08 MS |
2874 | /* If frame is inline, it certainly has symbols. */ |
2875 | gdb_assert (sym); | |
51abb421 PA |
2876 | |
2877 | symtab_and_line sal; | |
5d0027b9 | 2878 | if (sym->line () != 0) |
edb3359d | 2879 | { |
4206d69e | 2880 | sal.symtab = sym->symtab (); |
5d0027b9 | 2881 | sal.line = sym->line (); |
edb3359d DJ |
2882 | } |
2883 | else | |
2884 | /* If the symbol does not have a location, we don't know where | |
2885 | the call site is. Do not pretend to. This is jarring, but | |
2886 | we can't do much better. */ | |
51abb421 | 2887 | sal.pc = get_frame_pc (frame); |
edb3359d | 2888 | |
51abb421 PA |
2889 | sal.pspace = get_frame_program_space (frame); |
2890 | return sal; | |
edb3359d DJ |
2891 | } |
2892 | ||
1058bca7 AC |
2893 | /* If FRAME is not the innermost frame, that normally means that |
2894 | FRAME->pc points at the return instruction (which is *after* the | |
2895 | call instruction), and we want to get the line containing the | |
2896 | call (because the call is where the user thinks the program is). | |
2897 | However, if the next frame is either a SIGTRAMP_FRAME or a | |
2898 | DUMMY_FRAME, then the next frame will contain a saved interrupt | |
2899 | PC and such a PC indicates the current (rather than next) | |
2900 | instruction/line, consequently, for such cases, want to get the | |
2901 | line containing fi->pc. */ | |
e3eebbd7 | 2902 | if (!get_frame_pc_if_available (frame, &pc)) |
51abb421 | 2903 | return {}; |
e3eebbd7 PA |
2904 | |
2905 | notcurrent = (pc != get_frame_address_in_block (frame)); | |
51abb421 | 2906 | return find_pc_line (pc, notcurrent); |
1058bca7 AC |
2907 | } |
2908 | ||
c193f6ac AC |
2909 | /* Per "frame.h", return the ``address'' of the frame. Code should |
2910 | really be using get_frame_id(). */ | |
2911 | CORE_ADDR | |
8480a37e | 2912 | get_frame_base (const frame_info_ptr &fi) |
c193f6ac | 2913 | { |
d0a55772 | 2914 | return get_frame_id (fi).stack_addr; |
c193f6ac AC |
2915 | } |
2916 | ||
da62e633 AC |
2917 | /* High-level offsets into the frame. Used by the debug info. */ |
2918 | ||
2919 | CORE_ADDR | |
8480a37e | 2920 | get_frame_base_address (const frame_info_ptr &fi) |
da62e633 | 2921 | { |
7df05f2b | 2922 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2923 | return 0; |
2924 | if (fi->base == NULL) | |
86c31399 | 2925 | fi->base = frame_base_find_by_frame (fi); |
da62e633 AC |
2926 | /* Sneaky: If the low-level unwind and high-level base code share a |
2927 | common unwinder, let them share the prologue cache. */ | |
2928 | if (fi->base->unwind == fi->unwind) | |
669fac23 DJ |
2929 | return fi->base->this_base (fi, &fi->prologue_cache); |
2930 | return fi->base->this_base (fi, &fi->base_cache); | |
da62e633 AC |
2931 | } |
2932 | ||
2933 | CORE_ADDR | |
8480a37e | 2934 | get_frame_locals_address (const frame_info_ptr &fi) |
da62e633 | 2935 | { |
7df05f2b | 2936 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2937 | return 0; |
2938 | /* If there isn't a frame address method, find it. */ | |
2939 | if (fi->base == NULL) | |
86c31399 | 2940 | fi->base = frame_base_find_by_frame (fi); |
da62e633 AC |
2941 | /* Sneaky: If the low-level unwind and high-level base code share a |
2942 | common unwinder, let them share the prologue cache. */ | |
2943 | if (fi->base->unwind == fi->unwind) | |
669fac23 DJ |
2944 | return fi->base->this_locals (fi, &fi->prologue_cache); |
2945 | return fi->base->this_locals (fi, &fi->base_cache); | |
da62e633 AC |
2946 | } |
2947 | ||
2948 | CORE_ADDR | |
8480a37e | 2949 | get_frame_args_address (const frame_info_ptr &fi) |
da62e633 | 2950 | { |
7df05f2b | 2951 | if (get_frame_type (fi) != NORMAL_FRAME) |
da62e633 AC |
2952 | return 0; |
2953 | /* If there isn't a frame address method, find it. */ | |
2954 | if (fi->base == NULL) | |
86c31399 | 2955 | fi->base = frame_base_find_by_frame (fi); |
da62e633 AC |
2956 | /* Sneaky: If the low-level unwind and high-level base code share a |
2957 | common unwinder, let them share the prologue cache. */ | |
2958 | if (fi->base->unwind == fi->unwind) | |
669fac23 DJ |
2959 | return fi->base->this_args (fi, &fi->prologue_cache); |
2960 | return fi->base->this_args (fi, &fi->base_cache); | |
da62e633 AC |
2961 | } |
2962 | ||
e7802207 TT |
2963 | /* Return true if the frame unwinder for frame FI is UNWINDER; false |
2964 | otherwise. */ | |
2965 | ||
97916bfe | 2966 | bool |
8480a37e | 2967 | frame_unwinder_is (const frame_info_ptr &fi, const frame_unwind *unwinder) |
e7802207 | 2968 | { |
97916bfe | 2969 | if (fi->unwind == nullptr) |
9f9a8002 | 2970 | frame_unwind_find_by_frame (fi, &fi->prologue_cache); |
97916bfe | 2971 | |
e7802207 TT |
2972 | return fi->unwind == unwinder; |
2973 | } | |
2974 | ||
85cf597a AC |
2975 | /* Level of the selected frame: 0 for innermost, 1 for its caller, ... |
2976 | or -1 for a NULL frame. */ | |
2977 | ||
2978 | int | |
8480a37e | 2979 | frame_relative_level (const frame_info_ptr &fi) |
85cf597a AC |
2980 | { |
2981 | if (fi == NULL) | |
2982 | return -1; | |
2983 | else | |
2984 | return fi->level; | |
2985 | } | |
2986 | ||
5a203e44 | 2987 | enum frame_type |
8480a37e | 2988 | get_frame_type (const frame_info_ptr &frame) |
5a203e44 | 2989 | { |
c1bf6f65 AC |
2990 | if (frame->unwind == NULL) |
2991 | /* Initialize the frame's unwinder because that's what | |
2992 | provides the frame's type. */ | |
9f9a8002 | 2993 | frame_unwind_find_by_frame (frame, &frame->prologue_cache); |
c1bf6f65 | 2994 | return frame->unwind->type; |
5a203e44 AC |
2995 | } |
2996 | ||
6c95b8df | 2997 | struct program_space * |
8480a37e | 2998 | get_frame_program_space (const frame_info_ptr &frame) |
6c95b8df PA |
2999 | { |
3000 | return frame->pspace; | |
3001 | } | |
3002 | ||
3003 | struct program_space * | |
8480a37e | 3004 | frame_unwind_program_space (const frame_info_ptr &this_frame) |
6c95b8df PA |
3005 | { |
3006 | gdb_assert (this_frame); | |
3007 | ||
3008 | /* This is really a placeholder to keep the API consistent --- we | |
3009 | assume for now that we don't have frame chains crossing | |
3010 | spaces. */ | |
3011 | return this_frame->pspace; | |
3012 | } | |
3013 | ||
8b86c959 | 3014 | const address_space * |
8480a37e | 3015 | get_frame_address_space (const frame_info_ptr &frame) |
6c95b8df PA |
3016 | { |
3017 | return frame->aspace; | |
3018 | } | |
3019 | ||
ae1e7417 AC |
3020 | /* Memory access methods. */ |
3021 | ||
3022 | void | |
8480a37e | 3023 | get_frame_memory (const frame_info_ptr &this_frame, CORE_ADDR addr, |
bdec2917 | 3024 | gdb::array_view<gdb_byte> buffer) |
ae1e7417 | 3025 | { |
bdec2917 | 3026 | read_memory (addr, buffer.data (), buffer.size ()); |
ae1e7417 AC |
3027 | } |
3028 | ||
3029 | LONGEST | |
8480a37e | 3030 | get_frame_memory_signed (const frame_info_ptr &this_frame, CORE_ADDR addr, |
ae1e7417 AC |
3031 | int len) |
3032 | { | |
e17a4113 UW |
3033 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
3034 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1c4d3f96 | 3035 | |
e17a4113 | 3036 | return read_memory_integer (addr, len, byte_order); |
ae1e7417 AC |
3037 | } |
3038 | ||
3039 | ULONGEST | |
8480a37e | 3040 | get_frame_memory_unsigned (const frame_info_ptr &this_frame, CORE_ADDR addr, |
ae1e7417 AC |
3041 | int len) |
3042 | { | |
e17a4113 UW |
3043 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
3044 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1c4d3f96 | 3045 | |
e17a4113 | 3046 | return read_memory_unsigned_integer (addr, len, byte_order); |
ae1e7417 AC |
3047 | } |
3048 | ||
97916bfe | 3049 | bool |
8480a37e | 3050 | safe_frame_unwind_memory (const frame_info_ptr &this_frame, |
bdec2917 | 3051 | CORE_ADDR addr, gdb::array_view<gdb_byte> buffer) |
304396fb | 3052 | { |
8defab1a | 3053 | /* NOTE: target_read_memory returns zero on success! */ |
bdec2917 | 3054 | return target_read_memory (addr, buffer.data (), buffer.size ()) == 0; |
304396fb AC |
3055 | } |
3056 | ||
36f15f55 | 3057 | /* Architecture methods. */ |
ae1e7417 AC |
3058 | |
3059 | struct gdbarch * | |
8480a37e | 3060 | get_frame_arch (const frame_info_ptr &this_frame) |
ae1e7417 | 3061 | { |
bd2b40ac | 3062 | return frame_unwind_arch (frame_info_ptr (this_frame->next)); |
36f15f55 UW |
3063 | } |
3064 | ||
3065 | struct gdbarch * | |
8480a37e | 3066 | frame_unwind_arch (const frame_info_ptr &next_frame) |
36f15f55 UW |
3067 | { |
3068 | if (!next_frame->prev_arch.p) | |
3069 | { | |
3070 | struct gdbarch *arch; | |
0701b271 | 3071 | |
36f15f55 | 3072 | if (next_frame->unwind == NULL) |
9f9a8002 | 3073 | frame_unwind_find_by_frame (next_frame, &next_frame->prologue_cache); |
36f15f55 UW |
3074 | |
3075 | if (next_frame->unwind->prev_arch != NULL) | |
3076 | arch = next_frame->unwind->prev_arch (next_frame, | |
3077 | &next_frame->prologue_cache); | |
3078 | else | |
3079 | arch = get_frame_arch (next_frame); | |
3080 | ||
3081 | next_frame->prev_arch.arch = arch; | |
97916bfe | 3082 | next_frame->prev_arch.p = true; |
a05a883f SM |
3083 | frame_debug_printf ("next_frame=%d -> %s", |
3084 | next_frame->level, | |
3085 | gdbarch_bfd_arch_info (arch)->printable_name); | |
36f15f55 UW |
3086 | } |
3087 | ||
3088 | return next_frame->prev_arch.arch; | |
3089 | } | |
3090 | ||
3091 | struct gdbarch * | |
8480a37e | 3092 | frame_unwind_caller_arch (const frame_info_ptr &initial_next_frame) |
36f15f55 | 3093 | { |
8480a37e | 3094 | frame_info_ptr next_frame = skip_artificial_frames (initial_next_frame); |
33b4777c MM |
3095 | |
3096 | /* We must have a non-artificial frame. The caller is supposed to check | |
3097 | the result of frame_unwind_caller_id (), which returns NULL_FRAME_ID | |
3098 | in this case. */ | |
8480a37e | 3099 | gdb_assert (next_frame != nullptr); |
33b4777c MM |
3100 | |
3101 | return frame_unwind_arch (next_frame); | |
ae1e7417 AC |
3102 | } |
3103 | ||
06096720 AB |
3104 | /* Gets the language of FRAME. */ |
3105 | ||
3106 | enum language | |
8480a37e | 3107 | get_frame_language (const frame_info_ptr &frame) |
06096720 AB |
3108 | { |
3109 | CORE_ADDR pc = 0; | |
97916bfe | 3110 | bool pc_p = false; |
06096720 AB |
3111 | |
3112 | gdb_assert (frame!= NULL); | |
3113 | ||
3114 | /* We determine the current frame language by looking up its | |
3115 | associated symtab. To retrieve this symtab, we use the frame | |
3116 | PC. However we cannot use the frame PC as is, because it | |
3117 | usually points to the instruction following the "call", which | |
3118 | is sometimes the first instruction of another function. So | |
3119 | we rely on get_frame_address_in_block(), it provides us with | |
3120 | a PC that is guaranteed to be inside the frame's code | |
3121 | block. */ | |
3122 | ||
a70b8144 | 3123 | try |
06096720 AB |
3124 | { |
3125 | pc = get_frame_address_in_block (frame); | |
97916bfe | 3126 | pc_p = true; |
06096720 | 3127 | } |
230d2906 | 3128 | catch (const gdb_exception_error &ex) |
06096720 AB |
3129 | { |
3130 | if (ex.error != NOT_AVAILABLE_ERROR) | |
eedc3f4f | 3131 | throw; |
06096720 | 3132 | } |
06096720 AB |
3133 | |
3134 | if (pc_p) | |
3135 | { | |
3136 | struct compunit_symtab *cust = find_pc_compunit_symtab (pc); | |
3137 | ||
3138 | if (cust != NULL) | |
425d5e76 | 3139 | return cust->language (); |
06096720 AB |
3140 | } |
3141 | ||
3142 | return language_unknown; | |
3143 | } | |
3144 | ||
a9e5fdc2 AC |
3145 | /* Stack pointer methods. */ |
3146 | ||
3147 | CORE_ADDR | |
8480a37e | 3148 | get_frame_sp (const frame_info_ptr &this_frame) |
a9e5fdc2 | 3149 | { |
d56907c1 | 3150 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
1c4d3f96 | 3151 | |
8bcb5208 AB |
3152 | /* NOTE drow/2008-06-28: gdbarch_unwind_sp could be converted to |
3153 | operate on THIS_FRAME now. */ | |
bd2b40ac | 3154 | return gdbarch_unwind_sp (gdbarch, frame_info_ptr (this_frame->next)); |
a9e5fdc2 AC |
3155 | } |
3156 | ||
19b83d5c TT |
3157 | /* See frame.h. */ |
3158 | ||
3159 | frame_info_ptr | |
8480a37e | 3160 | frame_follow_static_link (const frame_info_ptr &initial_frame) |
19b83d5c | 3161 | { |
8480a37e | 3162 | const block *frame_block = get_frame_block (initial_frame, nullptr); |
1d197b25 HD |
3163 | if (frame_block == nullptr) |
3164 | return {}; | |
3165 | ||
19b83d5c TT |
3166 | frame_block = frame_block->function_block (); |
3167 | ||
3168 | const struct dynamic_prop *static_link = frame_block->static_link (); | |
3169 | if (static_link == nullptr) | |
3170 | return {}; | |
3171 | ||
3172 | CORE_ADDR upper_frame_base; | |
3173 | ||
8480a37e | 3174 | if (!dwarf2_evaluate_property (static_link, initial_frame, NULL, &upper_frame_base)) |
19b83d5c TT |
3175 | return {}; |
3176 | ||
3177 | /* Now climb up the stack frame until we reach the frame we are interested | |
3178 | in. */ | |
8480a37e | 3179 | frame_info_ptr frame = initial_frame; |
19b83d5c TT |
3180 | for (; frame != nullptr; frame = get_prev_frame (frame)) |
3181 | { | |
3182 | struct symbol *framefunc = get_frame_function (frame); | |
3183 | ||
3184 | /* Stacks can be quite deep: give the user a chance to stop this. */ | |
3185 | QUIT; | |
3186 | ||
3187 | /* If we don't know how to compute FRAME's base address, don't give up: | |
3188 | maybe the frame we are looking for is upper in the stack frame. */ | |
7ae24327 SM |
3189 | if (framefunc != nullptr) |
3190 | { | |
3191 | if (const symbol_block_ops *block_ops = framefunc->block_ops (); | |
3192 | (block_ops != nullptr | |
3193 | && block_ops->get_frame_base != nullptr | |
3194 | && (block_ops->get_frame_base (framefunc, frame) | |
3195 | == upper_frame_base))) | |
3196 | break; | |
3197 | } | |
19b83d5c TT |
3198 | } |
3199 | ||
3200 | return frame; | |
3201 | } | |
3202 | ||
55feb689 DJ |
3203 | /* Return the reason why we can't unwind past FRAME. */ |
3204 | ||
3205 | enum unwind_stop_reason | |
8480a37e | 3206 | get_frame_unwind_stop_reason (const frame_info_ptr &frame) |
55feb689 | 3207 | { |
824344ca | 3208 | /* Fill-in STOP_REASON. */ |
51d48146 | 3209 | get_prev_frame_always (frame); |
824344ca | 3210 | gdb_assert (frame->prev_p); |
55feb689 | 3211 | |
55feb689 DJ |
3212 | return frame->stop_reason; |
3213 | } | |
3214 | ||
3215 | /* Return a string explaining REASON. */ | |
3216 | ||
3217 | const char * | |
70e38b8e | 3218 | unwind_stop_reason_to_string (enum unwind_stop_reason reason) |
55feb689 DJ |
3219 | { |
3220 | switch (reason) | |
3221 | { | |
2231f1fb KP |
3222 | #define SET(name, description) \ |
3223 | case name: return _(description); | |
3224 | #include "unwind_stop_reasons.def" | |
3225 | #undef SET | |
55feb689 | 3226 | |
55feb689 | 3227 | default: |
f34652de | 3228 | internal_error ("Invalid frame stop reason"); |
55feb689 DJ |
3229 | } |
3230 | } | |
3231 | ||
53e8a631 | 3232 | const char * |
8480a37e | 3233 | frame_stop_reason_string (const frame_info_ptr &fi) |
53e8a631 AB |
3234 | { |
3235 | gdb_assert (fi->prev_p); | |
3236 | gdb_assert (fi->prev == NULL); | |
3237 | ||
3238 | /* Return the specific string if we have one. */ | |
3239 | if (fi->stop_string != NULL) | |
3240 | return fi->stop_string; | |
3241 | ||
3242 | /* Return the generic string if we have nothing better. */ | |
3243 | return unwind_stop_reason_to_string (fi->stop_reason); | |
3244 | } | |
3245 | ||
a7300869 PA |
3246 | /* Return the enum symbol name of REASON as a string, to use in debug |
3247 | output. */ | |
3248 | ||
3249 | static const char * | |
3250 | frame_stop_reason_symbol_string (enum unwind_stop_reason reason) | |
3251 | { | |
3252 | switch (reason) | |
3253 | { | |
3254 | #define SET(name, description) \ | |
3255 | case name: return #name; | |
3256 | #include "unwind_stop_reasons.def" | |
3257 | #undef SET | |
3258 | ||
3259 | default: | |
f34652de | 3260 | internal_error ("Invalid frame stop reason"); |
a7300869 PA |
3261 | } |
3262 | } | |
3263 | ||
669fac23 DJ |
3264 | /* Clean up after a failed (wrong unwinder) attempt to unwind past |
3265 | FRAME. */ | |
3266 | ||
30a9c02f | 3267 | void |
8480a37e | 3268 | frame_cleanup_after_sniffer (const frame_info_ptr &frame) |
669fac23 | 3269 | { |
669fac23 DJ |
3270 | /* The sniffer should not allocate a prologue cache if it did not |
3271 | match this frame. */ | |
3272 | gdb_assert (frame->prologue_cache == NULL); | |
3273 | ||
3274 | /* No sniffer should extend the frame chain; sniff based on what is | |
3275 | already certain. */ | |
3276 | gdb_assert (!frame->prev_p); | |
3277 | ||
3278 | /* The sniffer should not check the frame's ID; that's circular. */ | |
d19c3068 | 3279 | gdb_assert (frame->this_id.p != frame_id_status::COMPUTED); |
669fac23 DJ |
3280 | |
3281 | /* Clear cached fields dependent on the unwinder. | |
3282 | ||
3283 | The previous PC is independent of the unwinder, but the previous | |
ad1193e7 | 3284 | function is not (see get_frame_address_in_block). */ |
fedfee88 | 3285 | frame->prev_func.status = CC_UNKNOWN; |
669fac23 DJ |
3286 | frame->prev_func.addr = 0; |
3287 | ||
3288 | /* Discard the unwinder last, so that we can easily find it if an assertion | |
3289 | in this function triggers. */ | |
3290 | frame->unwind = NULL; | |
3291 | } | |
3292 | ||
3293 | /* Set FRAME's unwinder temporarily, so that we can call a sniffer. | |
30a9c02f TT |
3294 | If sniffing fails, the caller should be sure to call |
3295 | frame_cleanup_after_sniffer. */ | |
669fac23 | 3296 | |
30a9c02f | 3297 | void |
8480a37e | 3298 | frame_prepare_for_sniffer (const frame_info_ptr &frame, |
669fac23 DJ |
3299 | const struct frame_unwind *unwind) |
3300 | { | |
3301 | gdb_assert (frame->unwind == NULL); | |
3302 | frame->unwind = unwind; | |
669fac23 DJ |
3303 | } |
3304 | ||
25d29d70 AC |
3305 | static struct cmd_list_element *set_backtrace_cmdlist; |
3306 | static struct cmd_list_element *show_backtrace_cmdlist; | |
3307 | ||
d4c16835 PA |
3308 | /* Definition of the "set backtrace" settings that are exposed as |
3309 | "backtrace" command options. */ | |
3310 | ||
3311 | using boolean_option_def | |
3312 | = gdb::option::boolean_option_def<set_backtrace_options>; | |
d4c16835 PA |
3313 | |
3314 | const gdb::option::option_def set_backtrace_option_defs[] = { | |
3315 | ||
3316 | boolean_option_def { | |
3317 | "past-main", | |
3318 | [] (set_backtrace_options *opt) { return &opt->backtrace_past_main; }, | |
3319 | show_backtrace_past_main, /* show_cmd_cb */ | |
3320 | N_("Set whether backtraces should continue past \"main\"."), | |
3321 | N_("Show whether backtraces should continue past \"main\"."), | |
3322 | N_("Normally the caller of \"main\" is not of interest, so GDB will terminate\n\ | |
3323 | the backtrace at \"main\". Set this if you need to see the rest\n\ | |
3324 | of the stack trace."), | |
3325 | }, | |
3326 | ||
3327 | boolean_option_def { | |
3328 | "past-entry", | |
3329 | [] (set_backtrace_options *opt) { return &opt->backtrace_past_entry; }, | |
3330 | show_backtrace_past_entry, /* show_cmd_cb */ | |
3331 | N_("Set whether backtraces should continue past the entry point of a program."), | |
3332 | N_("Show whether backtraces should continue past the entry point of a program."), | |
3333 | N_("Normally there are no callers beyond the entry point of a program, so GDB\n\ | |
3334 | will terminate the backtrace there. Set this if you need to see\n\ | |
3335 | the rest of the stack trace."), | |
3336 | }, | |
3337 | }; | |
3338 | ||
70175292 AB |
3339 | /* Implement the 'maintenance print frame-id' command. */ |
3340 | ||
3341 | static void | |
3342 | maintenance_print_frame_id (const char *args, int from_tty) | |
3343 | { | |
bd2b40ac | 3344 | frame_info_ptr frame; |
70175292 AB |
3345 | |
3346 | /* Use the currently selected frame, or select a frame based on the level | |
3347 | number passed by the user. */ | |
3348 | if (args == nullptr) | |
3349 | frame = get_selected_frame ("No frame selected"); | |
3350 | else | |
3351 | { | |
3352 | int level = value_as_long (parse_and_eval (args)); | |
3353 | frame = find_relative_frame (get_current_frame (), &level); | |
3354 | } | |
3355 | ||
3356 | /* Print the frame-id. */ | |
3357 | gdb_assert (frame != nullptr); | |
3358 | gdb_printf ("frame-id for frame #%d: %s\n", | |
3359 | frame_relative_level (frame), | |
3360 | get_frame_id (frame).to_string ().c_str ()); | |
3361 | } | |
3362 | ||
43e8c9ce SM |
3363 | /* See frame-info-ptr.h. */ |
3364 | ||
93e39555 SM |
3365 | frame_info_ptr::frame_info_ptr (struct frame_info *ptr) |
3366 | : m_ptr (ptr) | |
43e8c9ce | 3367 | { |
93e39555 SM |
3368 | frame_list.push_back (*this); |
3369 | ||
3370 | if (m_ptr == nullptr) | |
3371 | return; | |
3372 | ||
3373 | m_cached_level = ptr->level; | |
43e8c9ce | 3374 | |
93e39555 SM |
3375 | if (m_cached_level != 0 || m_ptr->this_id.value.user_created_p) |
3376 | m_cached_id = m_ptr->this_id.value; | |
43e8c9ce SM |
3377 | } |
3378 | ||
3379 | /* See frame-info-ptr.h. */ | |
3380 | ||
908de5e6 SM |
3381 | frame_info * |
3382 | frame_info_ptr::reinflate () const | |
43e8c9ce | 3383 | { |
93e39555 | 3384 | /* Ensure we have a valid frame level (sentinel frame or above). */ |
43e8c9ce SM |
3385 | gdb_assert (m_cached_level >= -1); |
3386 | ||
3387 | if (m_ptr != nullptr) | |
3388 | { | |
3389 | /* The frame_info wasn't invalidated, no need to reinflate. */ | |
908de5e6 | 3390 | return m_ptr; |
43e8c9ce SM |
3391 | } |
3392 | ||
836a8d37 SM |
3393 | if (m_cached_id.user_created_p) |
3394 | m_ptr = create_new_frame (m_cached_id).get (); | |
43e8c9ce SM |
3395 | else |
3396 | { | |
836a8d37 SM |
3397 | /* Frame #0 needs special handling, see comment in select_frame. */ |
3398 | if (m_cached_level == 0) | |
3399 | m_ptr = get_current_frame ().get (); | |
3400 | else | |
3401 | { | |
3402 | /* If we reach here without a valid frame id, it means we are trying | |
3403 | to reinflate a frame whose id was not know at construction time. | |
3404 | We're probably trying to reinflate a frame while computing its id | |
3405 | which is not possible, and would indicate a problem with GDB. */ | |
3406 | gdb_assert (frame_id_p (m_cached_id)); | |
3407 | m_ptr = frame_find_by_id (m_cached_id).get (); | |
3408 | } | |
43e8c9ce SM |
3409 | } |
3410 | ||
3411 | gdb_assert (m_ptr != nullptr); | |
908de5e6 | 3412 | return m_ptr; |
43e8c9ce SM |
3413 | } |
3414 | ||
6c265988 | 3415 | void _initialize_frame (); |
4c1e7e9d | 3416 | void |
6c265988 | 3417 | _initialize_frame () |
4c1e7e9d AC |
3418 | { |
3419 | obstack_init (&frame_cache_obstack); | |
eb4f72c5 | 3420 | |
3de661e6 PM |
3421 | frame_stash_create (); |
3422 | ||
c90e7d63 SM |
3423 | gdb::observers::target_changed.attach (frame_observer_target_changed, |
3424 | "frame"); | |
f4c5303c | 3425 | |
f54bdb6d SM |
3426 | add_setshow_prefix_cmd ("backtrace", class_maintenance, |
3427 | _("\ | |
25d29d70 | 3428 | Set backtrace specific variables.\n\ |
1bedd215 | 3429 | Configure backtrace variables such as the backtrace limit"), |
f54bdb6d | 3430 | _("\ |
590042fc PW |
3431 | Show backtrace specific variables.\n\ |
3432 | Show backtrace variables such as the backtrace limit."), | |
f54bdb6d SM |
3433 | &set_backtrace_cmdlist, &show_backtrace_cmdlist, |
3434 | &setlist, &showlist); | |
25d29d70 | 3435 | |
883b9c6c | 3436 | add_setshow_uinteger_cmd ("limit", class_obscure, |
d4c16835 | 3437 | &user_set_backtrace_options.backtrace_limit, _("\ |
7915a72c AC |
3438 | Set an upper bound on the number of backtrace levels."), _("\ |
3439 | Show the upper bound on the number of backtrace levels."), _("\ | |
fec74868 | 3440 | No more than the specified number of frames can be displayed or examined.\n\ |
f81d1120 | 3441 | Literal \"unlimited\" or zero means no limit."), |
883b9c6c YQ |
3442 | NULL, |
3443 | show_backtrace_limit, | |
3444 | &set_backtrace_cmdlist, | |
3445 | &show_backtrace_cmdlist); | |
ac2bd0a9 | 3446 | |
d4c16835 PA |
3447 | gdb::option::add_setshow_cmds_for_options |
3448 | (class_stack, &user_set_backtrace_options, | |
3449 | set_backtrace_option_defs, &set_backtrace_cmdlist, &show_backtrace_cmdlist); | |
3450 | ||
0963b4bd | 3451 | /* Debug this files internals. */ |
dd4f75f2 | 3452 | add_setshow_boolean_cmd ("frame", class_maintenance, &frame_debug, _("\ |
85c07804 AC |
3453 | Set frame debugging."), _("\ |
3454 | Show frame debugging."), _("\ | |
3455 | When non-zero, frame specific internal debugging is enabled."), | |
dd4f75f2 SM |
3456 | NULL, |
3457 | show_frame_debug, | |
3458 | &setdebuglist, &showdebuglist); | |
70175292 AB |
3459 | |
3460 | add_cmd ("frame-id", class_maintenance, maintenance_print_frame_id, | |
3461 | _("Print the current frame-id."), | |
3462 | &maintenanceprintlist); | |
4c1e7e9d | 3463 | } |