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1 | /* Definitions for dealing with stack frames, for GDB, the GNU debugger. | |
2 | ||
3 | Copyright (C) 1986-2019 Free Software Foundation, Inc. | |
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 | |
9 | the Free Software Foundation; either version 3 of the License, or | |
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 | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #if !defined (FRAME_H) | |
21 | #define FRAME_H 1 | |
22 | ||
23 | /* The following is the intended naming schema for frame functions. | |
24 | It isn't 100% consistent, but it is aproaching that. Frame naming | |
25 | schema: | |
26 | ||
27 | Prefixes: | |
28 | ||
29 | get_frame_WHAT...(): Get WHAT from the THIS frame (functionally | |
30 | equivalent to THIS->next->unwind->what) | |
31 | ||
32 | frame_unwind_WHAT...(): Unwind THIS frame's WHAT from the NEXT | |
33 | frame. | |
34 | ||
35 | frame_unwind_caller_WHAT...(): Unwind WHAT for NEXT stack frame's | |
36 | real caller. Any inlined functions in NEXT's stack frame are | |
37 | skipped. Use these to ignore any potentially inlined functions, | |
38 | e.g. inlined into the first instruction of a library trampoline. | |
39 | ||
40 | get_stack_frame_WHAT...(): Get WHAT for THIS frame, but if THIS is | |
41 | inlined, skip to the containing stack frame. | |
42 | ||
43 | put_frame_WHAT...(): Put a value into this frame (unsafe, need to | |
44 | invalidate the frame / regcache afterwards) (better name more | |
45 | strongly hinting at its unsafeness) | |
46 | ||
47 | safe_....(): Safer version of various functions, doesn't throw an | |
48 | error (leave this for later?). Returns non-zero / non-NULL if the | |
49 | request succeeds, zero / NULL otherwize. | |
50 | ||
51 | Suffixes: | |
52 | ||
53 | void /frame/_WHAT(): Read WHAT's value into the buffer parameter. | |
54 | ||
55 | ULONGEST /frame/_WHAT_unsigned(): Return an unsigned value (the | |
56 | alternative is *frame_unsigned_WHAT). | |
57 | ||
58 | LONGEST /frame/_WHAT_signed(): Return WHAT signed value. | |
59 | ||
60 | What: | |
61 | ||
62 | /frame/_memory* (frame, coreaddr, len [, buf]): Extract/return | |
63 | *memory. | |
64 | ||
65 | /frame/_register* (frame, regnum [, buf]): extract/return register. | |
66 | ||
67 | CORE_ADDR /frame/_{pc,sp,...} (frame): Resume address, innner most | |
68 | stack *address, ... | |
69 | ||
70 | */ | |
71 | ||
72 | #include "language.h" | |
73 | ||
74 | struct symtab_and_line; | |
75 | struct frame_unwind; | |
76 | struct frame_base; | |
77 | struct block; | |
78 | struct gdbarch; | |
79 | struct ui_file; | |
80 | struct ui_out; | |
81 | ||
82 | /* Status of a given frame's stack. */ | |
83 | ||
84 | enum frame_id_stack_status | |
85 | { | |
86 | /* Stack address is invalid. E.g., this frame is the outermost | |
87 | (i.e., _start), and the stack hasn't been setup yet. */ | |
88 | FID_STACK_INVALID = 0, | |
89 | ||
90 | /* Stack address is valid, and is found in the stack_addr field. */ | |
91 | FID_STACK_VALID = 1, | |
92 | ||
93 | /* Sentinel frame. */ | |
94 | FID_STACK_SENTINEL = 2, | |
95 | ||
96 | /* Stack address is unavailable. I.e., there's a valid stack, but | |
97 | we don't know where it is (because memory or registers we'd | |
98 | compute it from were not collected). */ | |
99 | FID_STACK_UNAVAILABLE = -1 | |
100 | }; | |
101 | ||
102 | /* The frame object. */ | |
103 | ||
104 | struct frame_info; | |
105 | ||
106 | /* The frame object's ID. This provides a per-frame unique identifier | |
107 | that can be used to relocate a `struct frame_info' after a target | |
108 | resume or a frame cache destruct. It of course assumes that the | |
109 | inferior hasn't unwound the stack past that frame. */ | |
110 | ||
111 | struct frame_id | |
112 | { | |
113 | /* The frame's stack address. This shall be constant through out | |
114 | the lifetime of a frame. Note that this requirement applies to | |
115 | not just the function body, but also the prologue and (in theory | |
116 | at least) the epilogue. Since that value needs to fall either on | |
117 | the boundary, or within the frame's address range, the frame's | |
118 | outer-most address (the inner-most address of the previous frame) | |
119 | is used. Watch out for all the legacy targets that still use the | |
120 | function pointer register or stack pointer register. They are | |
121 | wrong. | |
122 | ||
123 | This field is valid only if frame_id.stack_status is | |
124 | FID_STACK_VALID. It will be 0 for other | |
125 | FID_STACK_... statuses. */ | |
126 | CORE_ADDR stack_addr; | |
127 | ||
128 | /* The frame's code address. This shall be constant through out the | |
129 | lifetime of the frame. While the PC (a.k.a. resume address) | |
130 | changes as the function is executed, this code address cannot. | |
131 | Typically, it is set to the address of the entry point of the | |
132 | frame's function (as returned by get_frame_func). | |
133 | ||
134 | For inlined functions (INLINE_DEPTH != 0), this is the address of | |
135 | the first executed instruction in the block corresponding to the | |
136 | inlined function. | |
137 | ||
138 | This field is valid only if code_addr_p is true. Otherwise, this | |
139 | frame is considered to have a wildcard code address, i.e. one that | |
140 | matches every address value in frame comparisons. */ | |
141 | CORE_ADDR code_addr; | |
142 | ||
143 | /* The frame's special address. This shall be constant through out the | |
144 | lifetime of the frame. This is used for architectures that may have | |
145 | frames that do not change the stack but are still distinct and have | |
146 | some form of distinct identifier (e.g. the ia64 which uses a 2nd | |
147 | stack for registers). This field is treated as unordered - i.e. will | |
148 | not be used in frame ordering comparisons. | |
149 | ||
150 | This field is valid only if special_addr_p is true. Otherwise, this | |
151 | frame is considered to have a wildcard special address, i.e. one that | |
152 | matches every address value in frame comparisons. */ | |
153 | CORE_ADDR special_addr; | |
154 | ||
155 | /* Flags to indicate the above fields have valid contents. */ | |
156 | ENUM_BITFIELD(frame_id_stack_status) stack_status : 3; | |
157 | unsigned int code_addr_p : 1; | |
158 | unsigned int special_addr_p : 1; | |
159 | ||
160 | /* It is non-zero for a frame made up by GDB without stack data | |
161 | representation in inferior, such as INLINE_FRAME or TAILCALL_FRAME. | |
162 | Caller of inlined function will have it zero, each more inner called frame | |
163 | will have it increasingly one, two etc. Similarly for TAILCALL_FRAME. */ | |
164 | int artificial_depth; | |
165 | }; | |
166 | ||
167 | /* Save and restore the currently selected frame. */ | |
168 | ||
169 | class scoped_restore_selected_frame | |
170 | { | |
171 | public: | |
172 | /* Save the currently selected frame. */ | |
173 | scoped_restore_selected_frame (); | |
174 | ||
175 | /* Restore the currently selected frame. */ | |
176 | ~scoped_restore_selected_frame (); | |
177 | ||
178 | DISABLE_COPY_AND_ASSIGN (scoped_restore_selected_frame); | |
179 | ||
180 | private: | |
181 | ||
182 | /* The ID of the previously selected frame. */ | |
183 | struct frame_id m_fid; | |
184 | }; | |
185 | ||
186 | /* Methods for constructing and comparing Frame IDs. */ | |
187 | ||
188 | /* For convenience. All fields are zero. This means "there is no frame". */ | |
189 | extern const struct frame_id null_frame_id; | |
190 | ||
191 | /* Sentinel frame. */ | |
192 | extern const struct frame_id sentinel_frame_id; | |
193 | ||
194 | /* This means "there is no frame ID, but there is a frame". It should be | |
195 | replaced by best-effort frame IDs for the outermost frame, somehow. | |
196 | The implementation is only special_addr_p set. */ | |
197 | extern const struct frame_id outer_frame_id; | |
198 | ||
199 | /* Flag to control debugging. */ | |
200 | ||
201 | extern unsigned int frame_debug; | |
202 | ||
203 | /* Construct a frame ID. The first parameter is the frame's constant | |
204 | stack address (typically the outer-bound), and the second the | |
205 | frame's constant code address (typically the entry point). | |
206 | The special identifier address is set to indicate a wild card. */ | |
207 | extern struct frame_id frame_id_build (CORE_ADDR stack_addr, | |
208 | CORE_ADDR code_addr); | |
209 | ||
210 | /* Construct a special frame ID. The first parameter is the frame's constant | |
211 | stack address (typically the outer-bound), the second is the | |
212 | frame's constant code address (typically the entry point), | |
213 | and the third parameter is the frame's special identifier address. */ | |
214 | extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr, | |
215 | CORE_ADDR code_addr, | |
216 | CORE_ADDR special_addr); | |
217 | ||
218 | /* Construct a frame ID representing a frame where the stack address | |
219 | exists, but is unavailable. CODE_ADDR is the frame's constant code | |
220 | address (typically the entry point). The special identifier | |
221 | address is set to indicate a wild card. */ | |
222 | extern struct frame_id frame_id_build_unavailable_stack (CORE_ADDR code_addr); | |
223 | ||
224 | /* Construct a frame ID representing a frame where the stack address | |
225 | exists, but is unavailable. CODE_ADDR is the frame's constant code | |
226 | address (typically the entry point). SPECIAL_ADDR is the special | |
227 | identifier address. */ | |
228 | extern struct frame_id | |
229 | frame_id_build_unavailable_stack_special (CORE_ADDR code_addr, | |
230 | CORE_ADDR special_addr); | |
231 | ||
232 | /* Construct a wild card frame ID. The parameter is the frame's constant | |
233 | stack address (typically the outer-bound). The code address as well | |
234 | as the special identifier address are set to indicate wild cards. */ | |
235 | extern struct frame_id frame_id_build_wild (CORE_ADDR stack_addr); | |
236 | ||
237 | /* Returns non-zero when L is a valid frame (a valid frame has a | |
238 | non-zero .base). The outermost frame is valid even without an | |
239 | ID. */ | |
240 | extern int frame_id_p (struct frame_id l); | |
241 | ||
242 | /* Returns non-zero when L is a valid frame representing a frame made up by GDB | |
243 | without stack data representation in inferior, such as INLINE_FRAME or | |
244 | TAILCALL_FRAME. */ | |
245 | extern int frame_id_artificial_p (struct frame_id l); | |
246 | ||
247 | /* Returns non-zero when L and R identify the same frame, or, if | |
248 | either L or R have a zero .func, then the same frame base. */ | |
249 | extern int frame_id_eq (struct frame_id l, struct frame_id r); | |
250 | ||
251 | /* Write the internal representation of a frame ID on the specified | |
252 | stream. */ | |
253 | extern void fprint_frame_id (struct ui_file *file, struct frame_id id); | |
254 | ||
255 | ||
256 | /* Frame types. Some are real, some are signal trampolines, and some | |
257 | are completely artificial (dummy). */ | |
258 | ||
259 | enum frame_type | |
260 | { | |
261 | /* A true stack frame, created by the target program during normal | |
262 | execution. */ | |
263 | NORMAL_FRAME, | |
264 | /* A fake frame, created by GDB when performing an inferior function | |
265 | call. */ | |
266 | DUMMY_FRAME, | |
267 | /* A frame representing an inlined function, associated with an | |
268 | upcoming (prev, outer, older) NORMAL_FRAME. */ | |
269 | INLINE_FRAME, | |
270 | /* A virtual frame of a tail call - see dwarf2_tailcall_frame_unwind. */ | |
271 | TAILCALL_FRAME, | |
272 | /* In a signal handler, various OSs handle this in various ways. | |
273 | The main thing is that the frame may be far from normal. */ | |
274 | SIGTRAMP_FRAME, | |
275 | /* Fake frame representing a cross-architecture call. */ | |
276 | ARCH_FRAME, | |
277 | /* Sentinel or registers frame. This frame obtains register values | |
278 | direct from the inferior's registers. */ | |
279 | SENTINEL_FRAME | |
280 | }; | |
281 | ||
282 | /* For every stopped thread, GDB tracks two frames: current and | |
283 | selected. Current frame is the inner most frame of the selected | |
284 | thread. Selected frame is the one being examined by the GDB | |
285 | CLI (selected using `up', `down', ...). The frames are created | |
286 | on-demand (via get_prev_frame()) and then held in a frame cache. */ | |
287 | /* FIXME: cagney/2002-11-28: Er, there is a lie here. If you do the | |
288 | sequence: `thread 1; up; thread 2; thread 1' you lose thread 1's | |
289 | selected frame. At present GDB only tracks the selected frame of | |
290 | the current thread. But be warned, that might change. */ | |
291 | /* FIXME: cagney/2002-11-14: At any time, only one thread's selected | |
292 | and current frame can be active. Switching threads causes gdb to | |
293 | discard all that cached frame information. Ulgh! Instead, current | |
294 | and selected frame should be bound to a thread. */ | |
295 | ||
296 | /* On demand, create the inner most frame using information found in | |
297 | the inferior. If the inner most frame can't be created, throw an | |
298 | error. */ | |
299 | extern struct frame_info *get_current_frame (void); | |
300 | ||
301 | /* Does the current target interface have enough state to be able to | |
302 | query the current inferior for frame info, and is the inferior in a | |
303 | state where that is possible? */ | |
304 | extern int has_stack_frames (void); | |
305 | ||
306 | /* Invalidates the frame cache (this function should have been called | |
307 | invalidate_cached_frames). | |
308 | ||
309 | FIXME: cagney/2002-11-28: There should be two methods: one that | |
310 | reverts the thread's selected frame back to current frame (for when | |
311 | the inferior resumes) and one that does not (for when the user | |
312 | modifies the target invalidating the frame cache). */ | |
313 | extern void reinit_frame_cache (void); | |
314 | ||
315 | /* On demand, create the selected frame and then return it. If the | |
316 | selected frame can not be created, this function prints then throws | |
317 | an error. When MESSAGE is non-NULL, use it for the error message, | |
318 | otherwize use a generic error message. */ | |
319 | /* FIXME: cagney/2002-11-28: At present, when there is no selected | |
320 | frame, this function always returns the current (inner most) frame. | |
321 | It should instead, when a thread has previously had its frame | |
322 | selected (but not resumed) and the frame cache invalidated, find | |
323 | and then return that thread's previously selected frame. */ | |
324 | extern struct frame_info *get_selected_frame (const char *message); | |
325 | ||
326 | /* If there is a selected frame, return it. Otherwise, return NULL. */ | |
327 | extern struct frame_info *get_selected_frame_if_set (void); | |
328 | ||
329 | /* Select a specific frame. NULL, apparently implies re-select the | |
330 | inner most frame. */ | |
331 | extern void select_frame (struct frame_info *); | |
332 | ||
333 | /* Given a FRAME, return the next (more inner, younger) or previous | |
334 | (more outer, older) frame. */ | |
335 | extern struct frame_info *get_prev_frame (struct frame_info *); | |
336 | extern struct frame_info *get_next_frame (struct frame_info *); | |
337 | ||
338 | /* Like get_next_frame(), but allows return of the sentinel frame. NULL | |
339 | is never returned. */ | |
340 | extern struct frame_info *get_next_frame_sentinel_okay (struct frame_info *); | |
341 | ||
342 | /* Return a "struct frame_info" corresponding to the frame that called | |
343 | THIS_FRAME. Returns NULL if there is no such frame. | |
344 | ||
345 | Unlike get_prev_frame, this function always tries to unwind the | |
346 | frame. */ | |
347 | extern struct frame_info *get_prev_frame_always (struct frame_info *); | |
348 | ||
349 | /* Given a frame's ID, relocate the frame. Returns NULL if the frame | |
350 | is not found. */ | |
351 | extern struct frame_info *frame_find_by_id (struct frame_id id); | |
352 | ||
353 | /* Given a frame's ID, find the previous frame's ID. Returns null_frame_id | |
354 | if the frame is not found. */ | |
355 | extern struct frame_id get_prev_frame_id_by_id (struct frame_id id); | |
356 | ||
357 | /* Base attributes of a frame: */ | |
358 | ||
359 | /* The frame's `resume' address. Where the program will resume in | |
360 | this frame. | |
361 | ||
362 | This replaced: frame->pc; */ | |
363 | extern CORE_ADDR get_frame_pc (struct frame_info *); | |
364 | ||
365 | /* Same as get_frame_pc, but return a boolean indication of whether | |
366 | the PC is actually available, instead of throwing an error. */ | |
367 | ||
368 | extern int get_frame_pc_if_available (struct frame_info *frame, | |
369 | CORE_ADDR *pc); | |
370 | ||
371 | /* An address (not necessarily aligned to an instruction boundary) | |
372 | that falls within THIS frame's code block. | |
373 | ||
374 | When a function call is the last statement in a block, the return | |
375 | address for the call may land at the start of the next block. | |
376 | Similarly, if a no-return function call is the last statement in | |
377 | the function, the return address may end up pointing beyond the | |
378 | function, and possibly at the start of the next function. | |
379 | ||
380 | These methods make an allowance for this. For call frames, this | |
381 | function returns the frame's PC-1 which "should" be an address in | |
382 | the frame's block. */ | |
383 | ||
384 | extern CORE_ADDR get_frame_address_in_block (struct frame_info *this_frame); | |
385 | ||
386 | /* Same as get_frame_address_in_block, but returns a boolean | |
387 | indication of whether the frame address is determinable (when the | |
388 | PC is unavailable, it will not be), instead of possibly throwing an | |
389 | error trying to read an unavailable PC. */ | |
390 | ||
391 | extern int | |
392 | get_frame_address_in_block_if_available (struct frame_info *this_frame, | |
393 | CORE_ADDR *pc); | |
394 | ||
395 | /* The frame's inner-most bound. AKA the stack-pointer. Confusingly | |
396 | known as top-of-stack. */ | |
397 | ||
398 | extern CORE_ADDR get_frame_sp (struct frame_info *); | |
399 | ||
400 | /* Following on from the `resume' address. Return the entry point | |
401 | address of the function containing that resume address, or zero if | |
402 | that function isn't known. */ | |
403 | extern CORE_ADDR get_frame_func (struct frame_info *fi); | |
404 | ||
405 | /* Same as get_frame_func, but returns a boolean indication of whether | |
406 | the frame function is determinable (when the PC is unavailable, it | |
407 | will not be), instead of possibly throwing an error trying to read | |
408 | an unavailable PC. */ | |
409 | ||
410 | extern int get_frame_func_if_available (struct frame_info *fi, CORE_ADDR *); | |
411 | ||
412 | /* Closely related to the resume address, various symbol table | |
413 | attributes that are determined by the PC. Note that for a normal | |
414 | frame, the PC refers to the resume address after the return, and | |
415 | not the call instruction. In such a case, the address is adjusted | |
416 | so that it (approximately) identifies the call site (and not the | |
417 | return site). | |
418 | ||
419 | NOTE: cagney/2002-11-28: The frame cache could be used to cache the | |
420 | computed value. Working on the assumption that the bottle-neck is | |
421 | in the single step code, and that code causes the frame cache to be | |
422 | constantly flushed, caching things in a frame is probably of little | |
423 | benefit. As they say `show us the numbers'. | |
424 | ||
425 | NOTE: cagney/2002-11-28: Plenty more where this one came from: | |
426 | find_frame_block(), find_frame_partial_function(), | |
427 | find_frame_symtab(), find_frame_function(). Each will need to be | |
428 | carefully considered to determine if the real intent was for it to | |
429 | apply to the PC or the adjusted PC. */ | |
430 | extern symtab_and_line find_frame_sal (frame_info *frame); | |
431 | ||
432 | /* Set the current source and line to the location given by frame | |
433 | FRAME, if possible. */ | |
434 | ||
435 | void set_current_sal_from_frame (struct frame_info *); | |
436 | ||
437 | /* Return the frame base (what ever that is) (DEPRECATED). | |
438 | ||
439 | Old code was trying to use this single method for two conflicting | |
440 | purposes. Such code needs to be updated to use either of: | |
441 | ||
442 | get_frame_id: A low level frame unique identifier, that consists of | |
443 | both a stack and a function address, that can be used to uniquely | |
444 | identify a frame. This value is determined by the frame's | |
445 | low-level unwinder, the stack part [typically] being the | |
446 | top-of-stack of the previous frame, and the function part being the | |
447 | function's start address. Since the correct identification of a | |
448 | frameless function requires both a stack and function address, | |
449 | the old get_frame_base method was not sufficient. | |
450 | ||
451 | get_frame_base_address: get_frame_locals_address: | |
452 | get_frame_args_address: A set of high-level debug-info dependant | |
453 | addresses that fall within the frame. These addresses almost | |
454 | certainly will not match the stack address part of a frame ID (as | |
455 | returned by get_frame_base). | |
456 | ||
457 | This replaced: frame->frame; */ | |
458 | ||
459 | extern CORE_ADDR get_frame_base (struct frame_info *); | |
460 | ||
461 | /* Return the per-frame unique identifer. Can be used to relocate a | |
462 | frame after a frame cache flush (and other similar operations). If | |
463 | FI is NULL, return the null_frame_id. | |
464 | ||
465 | NOTE: kettenis/20040508: These functions return a structure. On | |
466 | platforms where structures are returned in static storage (vax, | |
467 | m68k), this may trigger compiler bugs in code like: | |
468 | ||
469 | if (frame_id_eq (get_frame_id (l), get_frame_id (r))) | |
470 | ||
471 | where the return value from the first get_frame_id (l) gets | |
472 | overwritten by the second get_frame_id (r). Please avoid writing | |
473 | code like this. Use code like: | |
474 | ||
475 | struct frame_id id = get_frame_id (l); | |
476 | if (frame_id_eq (id, get_frame_id (r))) | |
477 | ||
478 | instead, since that avoids the bug. */ | |
479 | extern struct frame_id get_frame_id (struct frame_info *fi); | |
480 | extern struct frame_id get_stack_frame_id (struct frame_info *fi); | |
481 | extern struct frame_id frame_unwind_caller_id (struct frame_info *next_frame); | |
482 | ||
483 | /* Assuming that a frame is `normal', return its base-address, or 0 if | |
484 | the information isn't available. NOTE: This address is really only | |
485 | meaningful to the frame's high-level debug info. */ | |
486 | extern CORE_ADDR get_frame_base_address (struct frame_info *); | |
487 | ||
488 | /* Assuming that a frame is `normal', return the base-address of the | |
489 | local variables, or 0 if the information isn't available. NOTE: | |
490 | This address is really only meaningful to the frame's high-level | |
491 | debug info. Typically, the argument and locals share a single | |
492 | base-address. */ | |
493 | extern CORE_ADDR get_frame_locals_address (struct frame_info *); | |
494 | ||
495 | /* Assuming that a frame is `normal', return the base-address of the | |
496 | parameter list, or 0 if that information isn't available. NOTE: | |
497 | This address is really only meaningful to the frame's high-level | |
498 | debug info. Typically, the argument and locals share a single | |
499 | base-address. */ | |
500 | extern CORE_ADDR get_frame_args_address (struct frame_info *); | |
501 | ||
502 | /* The frame's level: 0 for innermost, 1 for its caller, ...; or -1 | |
503 | for an invalid frame). */ | |
504 | extern int frame_relative_level (struct frame_info *fi); | |
505 | ||
506 | /* Return the frame's type. */ | |
507 | ||
508 | extern enum frame_type get_frame_type (struct frame_info *); | |
509 | ||
510 | /* Return the frame's program space. */ | |
511 | extern struct program_space *get_frame_program_space (struct frame_info *); | |
512 | ||
513 | /* Unwind THIS frame's program space from the NEXT frame. */ | |
514 | extern struct program_space *frame_unwind_program_space (struct frame_info *); | |
515 | ||
516 | class address_space; | |
517 | ||
518 | /* Return the frame's address space. */ | |
519 | extern const address_space *get_frame_address_space (struct frame_info *); | |
520 | ||
521 | /* For frames where we can not unwind further, describe why. */ | |
522 | ||
523 | enum unwind_stop_reason | |
524 | { | |
525 | #define SET(name, description) name, | |
526 | #define FIRST_ENTRY(name) UNWIND_FIRST = name, | |
527 | #define LAST_ENTRY(name) UNWIND_LAST = name, | |
528 | #define FIRST_ERROR(name) UNWIND_FIRST_ERROR = name, | |
529 | ||
530 | #include "unwind_stop_reasons.def" | |
531 | #undef SET | |
532 | #undef FIRST_ENTRY | |
533 | #undef LAST_ENTRY | |
534 | #undef FIRST_ERROR | |
535 | }; | |
536 | ||
537 | /* Return the reason why we can't unwind past this frame. */ | |
538 | ||
539 | enum unwind_stop_reason get_frame_unwind_stop_reason (struct frame_info *); | |
540 | ||
541 | /* Translate a reason code to an informative string. This converts the | |
542 | generic stop reason codes into a generic string describing the code. | |
543 | For a possibly frame specific string explaining the stop reason, use | |
544 | FRAME_STOP_REASON_STRING instead. */ | |
545 | ||
546 | const char *unwind_stop_reason_to_string (enum unwind_stop_reason); | |
547 | ||
548 | /* Return a possibly frame specific string explaining why the unwind | |
549 | stopped here. E.g., if unwinding tripped on a memory error, this | |
550 | will return the error description string, which includes the address | |
551 | that we failed to access. If there's no specific reason stored for | |
552 | a frame then a generic reason string will be returned. | |
553 | ||
554 | Should only be called for frames that don't have a previous frame. */ | |
555 | ||
556 | const char *frame_stop_reason_string (struct frame_info *); | |
557 | ||
558 | /* Unwind the stack frame so that the value of REGNUM, in the previous | |
559 | (up, older) frame is returned. If VALUEP is NULL, don't | |
560 | fetch/compute the value. Instead just return the location of the | |
561 | value. */ | |
562 | extern void frame_register_unwind (frame_info *frame, int regnum, | |
563 | int *optimizedp, int *unavailablep, | |
564 | enum lval_type *lvalp, | |
565 | CORE_ADDR *addrp, int *realnump, | |
566 | gdb_byte *valuep); | |
567 | ||
568 | /* Fetch a register from this, or unwind a register from the next | |
569 | frame. Note that the get_frame methods are wrappers to | |
570 | frame->next->unwind. They all [potentially] throw an error if the | |
571 | fetch fails. The value methods never return NULL, but usually | |
572 | do return a lazy value. */ | |
573 | ||
574 | extern void frame_unwind_register (frame_info *next_frame, | |
575 | int regnum, gdb_byte *buf); | |
576 | extern void get_frame_register (struct frame_info *frame, | |
577 | int regnum, gdb_byte *buf); | |
578 | ||
579 | struct value *frame_unwind_register_value (frame_info *next_frame, | |
580 | int regnum); | |
581 | struct value *get_frame_register_value (struct frame_info *frame, | |
582 | int regnum); | |
583 | ||
584 | extern LONGEST frame_unwind_register_signed (frame_info *next_frame, | |
585 | int regnum); | |
586 | extern LONGEST get_frame_register_signed (struct frame_info *frame, | |
587 | int regnum); | |
588 | extern ULONGEST frame_unwind_register_unsigned (frame_info *frame, | |
589 | int regnum); | |
590 | extern ULONGEST get_frame_register_unsigned (struct frame_info *frame, | |
591 | int regnum); | |
592 | ||
593 | /* Read a register from this, or unwind a register from the next | |
594 | frame. Note that the read_frame methods are wrappers to | |
595 | get_frame_register_value, that do not throw if the result is | |
596 | optimized out or unavailable. */ | |
597 | ||
598 | extern int read_frame_register_unsigned (struct frame_info *frame, | |
599 | int regnum, ULONGEST *val); | |
600 | ||
601 | /* Get the value of the register that belongs to this FRAME. This | |
602 | function is a wrapper to the call sequence ``frame_register_unwind | |
603 | (get_next_frame (FRAME))''. As per frame_register_unwind(), if | |
604 | VALUEP is NULL, the registers value is not fetched/computed. */ | |
605 | ||
606 | extern void frame_register (struct frame_info *frame, int regnum, | |
607 | int *optimizedp, int *unavailablep, | |
608 | enum lval_type *lvalp, | |
609 | CORE_ADDR *addrp, int *realnump, | |
610 | gdb_byte *valuep); | |
611 | ||
612 | /* The reverse. Store a register value relative to the specified | |
613 | frame. Note: this call makes the frame's state undefined. The | |
614 | register and frame caches must be flushed. */ | |
615 | extern void put_frame_register (struct frame_info *frame, int regnum, | |
616 | const gdb_byte *buf); | |
617 | ||
618 | /* Read LEN bytes from one or multiple registers starting with REGNUM | |
619 | in frame FRAME, starting at OFFSET, into BUF. If the register | |
620 | contents are optimized out or unavailable, set *OPTIMIZEDP, | |
621 | *UNAVAILABLEP accordingly. */ | |
622 | extern int get_frame_register_bytes (struct frame_info *frame, int regnum, | |
623 | CORE_ADDR offset, int len, | |
624 | gdb_byte *myaddr, | |
625 | int *optimizedp, int *unavailablep); | |
626 | ||
627 | /* Write LEN bytes to one or multiple registers starting with REGNUM | |
628 | in frame FRAME, starting at OFFSET, into BUF. */ | |
629 | extern void put_frame_register_bytes (struct frame_info *frame, int regnum, | |
630 | CORE_ADDR offset, int len, | |
631 | const gdb_byte *myaddr); | |
632 | ||
633 | /* Unwind the PC. Strictly speaking return the resume address of the | |
634 | calling frame. For GDB, `pc' is the resume address and not a | |
635 | specific register. */ | |
636 | ||
637 | extern CORE_ADDR frame_unwind_caller_pc (struct frame_info *frame); | |
638 | ||
639 | /* Discard the specified frame. Restoring the registers to the state | |
640 | of the caller. */ | |
641 | extern void frame_pop (struct frame_info *frame); | |
642 | ||
643 | /* Return memory from the specified frame. A frame knows its thread / | |
644 | LWP and hence can find its way down to a target. The assumption | |
645 | here is that the current and previous frame share a common address | |
646 | space. | |
647 | ||
648 | If the memory read fails, these methods throw an error. | |
649 | ||
650 | NOTE: cagney/2003-06-03: Should there be unwind versions of these | |
651 | methods? That isn't clear. Can code, for instance, assume that | |
652 | this and the previous frame's memory or architecture are identical? | |
653 | If architecture / memory changes are always separated by special | |
654 | adaptor frames this should be ok. */ | |
655 | ||
656 | extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, | |
657 | gdb_byte *buf, int len); | |
658 | extern LONGEST get_frame_memory_signed (struct frame_info *this_frame, | |
659 | CORE_ADDR memaddr, int len); | |
660 | extern ULONGEST get_frame_memory_unsigned (struct frame_info *this_frame, | |
661 | CORE_ADDR memaddr, int len); | |
662 | ||
663 | /* Same as above, but return non-zero when the entire memory read | |
664 | succeeds, zero otherwize. */ | |
665 | extern int safe_frame_unwind_memory (struct frame_info *this_frame, | |
666 | CORE_ADDR addr, gdb_byte *buf, int len); | |
667 | ||
668 | /* Return this frame's architecture. */ | |
669 | extern struct gdbarch *get_frame_arch (struct frame_info *this_frame); | |
670 | ||
671 | /* Return the previous frame's architecture. */ | |
672 | extern struct gdbarch *frame_unwind_arch (frame_info *next_frame); | |
673 | ||
674 | /* Return the previous frame's architecture, skipping inline functions. */ | |
675 | extern struct gdbarch *frame_unwind_caller_arch (struct frame_info *frame); | |
676 | ||
677 | ||
678 | /* Values for the source flag to be used in print_frame_info_base(). */ | |
679 | enum print_what | |
680 | { | |
681 | /* Print only the source line, like in stepi. */ | |
682 | SRC_LINE = -1, | |
683 | /* Print only the location, i.e. level, address (sometimes) | |
684 | function, args, file, line, line num. */ | |
685 | LOCATION, | |
686 | /* Print both of the above. */ | |
687 | SRC_AND_LOC, | |
688 | /* Print location only, but always include the address. */ | |
689 | LOC_AND_ADDRESS | |
690 | }; | |
691 | ||
692 | /* Allocate zero initialized memory from the frame cache obstack. | |
693 | Appendices to the frame info (such as the unwind cache) should | |
694 | allocate memory using this method. */ | |
695 | ||
696 | extern void *frame_obstack_zalloc (unsigned long size); | |
697 | #define FRAME_OBSTACK_ZALLOC(TYPE) \ | |
698 | ((TYPE *) frame_obstack_zalloc (sizeof (TYPE))) | |
699 | #define FRAME_OBSTACK_CALLOC(NUMBER,TYPE) \ | |
700 | ((TYPE *) frame_obstack_zalloc ((NUMBER) * sizeof (TYPE))) | |
701 | ||
702 | class readonly_detached_regcache; | |
703 | /* Create a regcache, and copy the frame's registers into it. */ | |
704 | std::unique_ptr<readonly_detached_regcache> frame_save_as_regcache | |
705 | (struct frame_info *this_frame); | |
706 | ||
707 | extern const struct block *get_frame_block (struct frame_info *, | |
708 | CORE_ADDR *addr_in_block); | |
709 | ||
710 | /* Return the `struct block' that belongs to the selected thread's | |
711 | selected frame. If the inferior has no state, return NULL. | |
712 | ||
713 | NOTE: cagney/2002-11-29: | |
714 | ||
715 | No state? Does the inferior have any execution state (a core file | |
716 | does, an executable does not). At present the code tests | |
717 | `target_has_stack' but I'm left wondering if it should test | |
718 | `target_has_registers' or, even, a merged target_has_state. | |
719 | ||
720 | Should it look at the most recently specified SAL? If the target | |
721 | has no state, should this function try to extract a block from the | |
722 | most recently selected SAL? That way `list foo' would give it some | |
723 | sort of reference point. Then again, perhaps that would confuse | |
724 | things. | |
725 | ||
726 | Calls to this function can be broken down into two categories: Code | |
727 | that uses the selected block as an additional, but optional, data | |
728 | point; Code that uses the selected block as a prop, when it should | |
729 | have the relevant frame/block/pc explicitly passed in. | |
730 | ||
731 | The latter can be eliminated by correctly parameterizing the code, | |
732 | the former though is more interesting. Per the "address" command, | |
733 | it occurs in the CLI code and makes it possible for commands to | |
734 | work, even when the inferior has no state. */ | |
735 | ||
736 | extern const struct block *get_selected_block (CORE_ADDR *addr_in_block); | |
737 | ||
738 | extern struct symbol *get_frame_function (struct frame_info *); | |
739 | ||
740 | extern CORE_ADDR get_pc_function_start (CORE_ADDR); | |
741 | ||
742 | extern struct frame_info *find_relative_frame (struct frame_info *, int *); | |
743 | ||
744 | /* Wrapper over print_stack_frame modifying current_uiout with UIOUT for | |
745 | the function call. */ | |
746 | ||
747 | extern void print_stack_frame_to_uiout (struct ui_out *uiout, | |
748 | struct frame_info *, int print_level, | |
749 | enum print_what print_what, | |
750 | int set_current_sal); | |
751 | ||
752 | extern void print_stack_frame (struct frame_info *, int print_level, | |
753 | enum print_what print_what, | |
754 | int set_current_sal); | |
755 | ||
756 | extern void print_frame_info (struct frame_info *, int print_level, | |
757 | enum print_what print_what, int args, | |
758 | int set_current_sal); | |
759 | ||
760 | extern struct frame_info *block_innermost_frame (const struct block *); | |
761 | ||
762 | extern int deprecated_frame_register_read (struct frame_info *frame, int regnum, | |
763 | gdb_byte *buf); | |
764 | ||
765 | /* From stack.c. */ | |
766 | ||
767 | extern const char print_entry_values_no[]; | |
768 | extern const char print_entry_values_only[]; | |
769 | extern const char print_entry_values_preferred[]; | |
770 | extern const char print_entry_values_if_needed[]; | |
771 | extern const char print_entry_values_both[]; | |
772 | extern const char print_entry_values_compact[]; | |
773 | extern const char print_entry_values_default[]; | |
774 | extern const char *print_entry_values; | |
775 | ||
776 | /* Inferior function parameter value read in from a frame. */ | |
777 | ||
778 | struct frame_arg | |
779 | { | |
780 | /* Symbol for this parameter used for example for its name. */ | |
781 | struct symbol *sym; | |
782 | ||
783 | /* Value of the parameter. It is NULL if ERROR is not NULL; if both VAL and | |
784 | ERROR are NULL this parameter's value should not be printed. */ | |
785 | struct value *val; | |
786 | ||
787 | /* String containing the error message, it is more usually NULL indicating no | |
788 | error occured reading this parameter. */ | |
789 | char *error; | |
790 | ||
791 | /* One of the print_entry_values_* entries as appropriate specifically for | |
792 | this frame_arg. It will be different from print_entry_values. With | |
793 | print_entry_values_no this frame_arg should be printed as a normal | |
794 | parameter. print_entry_values_only says it should be printed as entry | |
795 | value parameter. print_entry_values_compact says it should be printed as | |
796 | both as a normal parameter and entry values parameter having the same | |
797 | value - print_entry_values_compact is not permitted fi ui_out_is_mi_like_p | |
798 | (in such case print_entry_values_no and print_entry_values_only is used | |
799 | for each parameter kind specifically. */ | |
800 | const char *entry_kind; | |
801 | }; | |
802 | ||
803 | extern void read_frame_arg (struct symbol *sym, struct frame_info *frame, | |
804 | struct frame_arg *argp, | |
805 | struct frame_arg *entryargp); | |
806 | extern void read_frame_local (struct symbol *sym, struct frame_info *frame, | |
807 | struct frame_arg *argp); | |
808 | ||
809 | extern void info_args_command (const char *, int); | |
810 | ||
811 | extern void info_locals_command (const char *, int); | |
812 | ||
813 | extern void return_command (const char *, int); | |
814 | ||
815 | /* Set FRAME's unwinder temporarily, so that we can call a sniffer. | |
816 | If sniffing fails, the caller should be sure to call | |
817 | frame_cleanup_after_sniffer. */ | |
818 | ||
819 | extern void frame_prepare_for_sniffer (struct frame_info *frame, | |
820 | const struct frame_unwind *unwind); | |
821 | ||
822 | /* Clean up after a failed (wrong unwinder) attempt to unwind past | |
823 | FRAME. */ | |
824 | ||
825 | extern void frame_cleanup_after_sniffer (struct frame_info *frame); | |
826 | ||
827 | /* Notes (cagney/2002-11-27, drow/2003-09-06): | |
828 | ||
829 | You might think that calls to this function can simply be replaced by a | |
830 | call to get_selected_frame(). | |
831 | ||
832 | Unfortunately, it isn't that easy. | |
833 | ||
834 | The relevant code needs to be audited to determine if it is | |
835 | possible (or practical) to instead pass the applicable frame in as a | |
836 | parameter. For instance, DEPRECATED_DO_REGISTERS_INFO() relied on | |
837 | the deprecated_selected_frame global, while its replacement, | |
838 | PRINT_REGISTERS_INFO(), is parameterized with the selected frame. | |
839 | The only real exceptions occur at the edge (in the CLI code) where | |
840 | user commands need to pick up the selected frame before proceeding. | |
841 | ||
842 | There are also some functions called with a NULL frame meaning either "the | |
843 | program is not running" or "use the selected frame". | |
844 | ||
845 | This is important. GDB is trying to stamp out the hack: | |
846 | ||
847 | saved_frame = deprecated_safe_get_selected_frame (); | |
848 | select_frame (...); | |
849 | hack_using_global_selected_frame (); | |
850 | select_frame (saved_frame); | |
851 | ||
852 | Take care! | |
853 | ||
854 | This function calls get_selected_frame if the inferior should have a | |
855 | frame, or returns NULL otherwise. */ | |
856 | ||
857 | extern struct frame_info *deprecated_safe_get_selected_frame (void); | |
858 | ||
859 | /* Create a frame using the specified BASE and PC. */ | |
860 | ||
861 | extern struct frame_info *create_new_frame (CORE_ADDR base, CORE_ADDR pc); | |
862 | ||
863 | /* Return true if the frame unwinder for frame FI is UNWINDER; false | |
864 | otherwise. */ | |
865 | ||
866 | extern int frame_unwinder_is (struct frame_info *fi, | |
867 | const struct frame_unwind *unwinder); | |
868 | ||
869 | /* Return the language of FRAME. */ | |
870 | ||
871 | extern enum language get_frame_language (struct frame_info *frame); | |
872 | ||
873 | /* Return the first non-tailcall frame above FRAME or FRAME if it is not a | |
874 | tailcall frame. Return NULL if FRAME is the start of a tailcall-only | |
875 | chain. */ | |
876 | ||
877 | extern struct frame_info *skip_tailcall_frames (struct frame_info *frame); | |
878 | ||
879 | /* Return the first frame above FRAME or FRAME of which the code is | |
880 | writable. */ | |
881 | ||
882 | extern struct frame_info *skip_unwritable_frames (struct frame_info *frame); | |
883 | ||
884 | #endif /* !defined (FRAME_H) */ |