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/tmp/gdb-8.1/gdb/frame.h
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1 /* Definitions for dealing with stack frames, for GDB, the GNU debugger.
2
3 Copyright (C) 1986-2018 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 (functionaly
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 /* Methods for constructing and comparing Frame IDs. */
168
169 /* For convenience. All fields are zero. This means "there is no frame". */
170 extern const struct frame_id null_frame_id;
171
172 /* Sentinel frame. */
173 extern const struct frame_id sentinel_frame_id;
174
175 /* This means "there is no frame ID, but there is a frame". It should be
176 replaced by best-effort frame IDs for the outermost frame, somehow.
177 The implementation is only special_addr_p set. */
178 extern const struct frame_id outer_frame_id;
179
180 /* Flag to control debugging. */
181
182 extern unsigned int frame_debug;
183
184 /* Construct a frame ID. The first parameter is the frame's constant
185 stack address (typically the outer-bound), and the second the
186 frame's constant code address (typically the entry point).
187 The special identifier address is set to indicate a wild card. */
188 extern struct frame_id frame_id_build (CORE_ADDR stack_addr,
189 CORE_ADDR code_addr);
190
191 /* Construct a special frame ID. The first parameter is the frame's constant
192 stack address (typically the outer-bound), the second is the
193 frame's constant code address (typically the entry point),
194 and the third parameter is the frame's special identifier address. */
195 extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr,
196 CORE_ADDR code_addr,
197 CORE_ADDR special_addr);
198
199 /* Construct a frame ID representing a frame where the stack address
200 exists, but is unavailable. CODE_ADDR is the frame's constant code
201 address (typically the entry point). The special identifier
202 address is set to indicate a wild card. */
203 extern struct frame_id frame_id_build_unavailable_stack (CORE_ADDR code_addr);
204
205 /* Construct a frame ID representing a frame where the stack address
206 exists, but is unavailable. CODE_ADDR is the frame's constant code
207 address (typically the entry point). SPECIAL_ADDR is the special
208 identifier address. */
209 extern struct frame_id
210 frame_id_build_unavailable_stack_special (CORE_ADDR code_addr,
211 CORE_ADDR special_addr);
212
213 /* Construct a wild card frame ID. The parameter is the frame's constant
214 stack address (typically the outer-bound). The code address as well
215 as the special identifier address are set to indicate wild cards. */
216 extern struct frame_id frame_id_build_wild (CORE_ADDR stack_addr);
217
218 /* Returns non-zero when L is a valid frame (a valid frame has a
219 non-zero .base). The outermost frame is valid even without an
220 ID. */
221 extern int frame_id_p (struct frame_id l);
222
223 /* Returns non-zero when L is a valid frame representing a frame made up by GDB
224 without stack data representation in inferior, such as INLINE_FRAME or
225 TAILCALL_FRAME. */
226 extern int frame_id_artificial_p (struct frame_id l);
227
228 /* Returns non-zero when L and R identify the same frame, or, if
229 either L or R have a zero .func, then the same frame base. */
230 extern int frame_id_eq (struct frame_id l, struct frame_id r);
231
232 /* Write the internal representation of a frame ID on the specified
233 stream. */
234 extern void fprint_frame_id (struct ui_file *file, struct frame_id id);
235
236
237 /* Frame types. Some are real, some are signal trampolines, and some
238 are completely artificial (dummy). */
239
240 enum frame_type
241 {
242 /* A true stack frame, created by the target program during normal
243 execution. */
244 NORMAL_FRAME,
245 /* A fake frame, created by GDB when performing an inferior function
246 call. */
247 DUMMY_FRAME,
248 /* A frame representing an inlined function, associated with an
249 upcoming (prev, outer, older) NORMAL_FRAME. */
250 INLINE_FRAME,
251 /* A virtual frame of a tail call - see dwarf2_tailcall_frame_unwind. */
252 TAILCALL_FRAME,
253 /* In a signal handler, various OSs handle this in various ways.
254 The main thing is that the frame may be far from normal. */
255 SIGTRAMP_FRAME,
256 /* Fake frame representing a cross-architecture call. */
257 ARCH_FRAME,
258 /* Sentinel or registers frame. This frame obtains register values
259 direct from the inferior's registers. */
260 SENTINEL_FRAME
261 };
262
263 /* For every stopped thread, GDB tracks two frames: current and
264 selected. Current frame is the inner most frame of the selected
265 thread. Selected frame is the one being examined by the GDB
266 CLI (selected using `up', `down', ...). The frames are created
267 on-demand (via get_prev_frame()) and then held in a frame cache. */
268 /* FIXME: cagney/2002-11-28: Er, there is a lie here. If you do the
269 sequence: `thread 1; up; thread 2; thread 1' you lose thread 1's
270 selected frame. At present GDB only tracks the selected frame of
271 the current thread. But be warned, that might change. */
272 /* FIXME: cagney/2002-11-14: At any time, only one thread's selected
273 and current frame can be active. Switching threads causes gdb to
274 discard all that cached frame information. Ulgh! Instead, current
275 and selected frame should be bound to a thread. */
276
277 /* On demand, create the inner most frame using information found in
278 the inferior. If the inner most frame can't be created, throw an
279 error. */
280 extern struct frame_info *get_current_frame (void);
281
282 /* Does the current target interface have enough state to be able to
283 query the current inferior for frame info, and is the inferior in a
284 state where that is possible? */
285 extern int has_stack_frames (void);
286
287 /* Invalidates the frame cache (this function should have been called
288 invalidate_cached_frames).
289
290 FIXME: cagney/2002-11-28: There should be two methods: one that
291 reverts the thread's selected frame back to current frame (for when
292 the inferior resumes) and one that does not (for when the user
293 modifies the target invalidating the frame cache). */
294 extern void reinit_frame_cache (void);
295
296 /* On demand, create the selected frame and then return it. If the
297 selected frame can not be created, this function prints then throws
298 an error. When MESSAGE is non-NULL, use it for the error message,
299 otherwize use a generic error message. */
300 /* FIXME: cagney/2002-11-28: At present, when there is no selected
301 frame, this function always returns the current (inner most) frame.
302 It should instead, when a thread has previously had its frame
303 selected (but not resumed) and the frame cache invalidated, find
304 and then return that thread's previously selected frame. */
305 extern struct frame_info *get_selected_frame (const char *message);
306
307 /* If there is a selected frame, return it. Otherwise, return NULL. */
308 extern struct frame_info *get_selected_frame_if_set (void);
309
310 /* Select a specific frame. NULL, apparently implies re-select the
311 inner most frame. */
312 extern void select_frame (struct frame_info *);
313
314 /* Given a FRAME, return the next (more inner, younger) or previous
315 (more outer, older) frame. */
316 extern struct frame_info *get_prev_frame (struct frame_info *);
317 extern struct frame_info *get_next_frame (struct frame_info *);
318
319 /* Like get_next_frame(), but allows return of the sentinel frame. NULL
320 is never returned. */
321 extern struct frame_info *get_next_frame_sentinel_okay (struct frame_info *);
322
323 /* Return a "struct frame_info" corresponding to the frame that called
324 THIS_FRAME. Returns NULL if there is no such frame.
325
326 Unlike get_prev_frame, this function always tries to unwind the
327 frame. */
328 extern struct frame_info *get_prev_frame_always (struct frame_info *);
329
330 /* Given a frame's ID, relocate the frame. Returns NULL if the frame
331 is not found. */
332 extern struct frame_info *frame_find_by_id (struct frame_id id);
333
334 /* Given a frame's ID, find the previous frame's ID. Returns null_frame_id
335 if the frame is not found. */
336 extern struct frame_id get_prev_frame_id_by_id (struct frame_id id);
337
338 /* Base attributes of a frame: */
339
340 /* The frame's `resume' address. Where the program will resume in
341 this frame.
342
343 This replaced: frame->pc; */
344 extern CORE_ADDR get_frame_pc (struct frame_info *);
345
346 /* Same as get_frame_pc, but return a boolean indication of whether
347 the PC is actually available, instead of throwing an error. */
348
349 extern int get_frame_pc_if_available (struct frame_info *frame,
350 CORE_ADDR *pc);
351
352 /* An address (not necessarily aligned to an instruction boundary)
353 that falls within THIS frame's code block.
354
355 When a function call is the last statement in a block, the return
356 address for the call may land at the start of the next block.
357 Similarly, if a no-return function call is the last statement in
358 the function, the return address may end up pointing beyond the
359 function, and possibly at the start of the next function.
360
361 These methods make an allowance for this. For call frames, this
362 function returns the frame's PC-1 which "should" be an address in
363 the frame's block. */
364
365 extern CORE_ADDR get_frame_address_in_block (struct frame_info *this_frame);
366
367 /* Same as get_frame_address_in_block, but returns a boolean
368 indication of whether the frame address is determinable (when the
369 PC is unavailable, it will not be), instead of possibly throwing an
370 error trying to read an unavailable PC. */
371
372 extern int
373 get_frame_address_in_block_if_available (struct frame_info *this_frame,
374 CORE_ADDR *pc);
375
376 /* The frame's inner-most bound. AKA the stack-pointer. Confusingly
377 known as top-of-stack. */
378
379 extern CORE_ADDR get_frame_sp (struct frame_info *);
380
381 /* Following on from the `resume' address. Return the entry point
382 address of the function containing that resume address, or zero if
383 that function isn't known. */
384 extern CORE_ADDR get_frame_func (struct frame_info *fi);
385
386 /* Same as get_frame_func, but returns a boolean indication of whether
387 the frame function is determinable (when the PC is unavailable, it
388 will not be), instead of possibly throwing an error trying to read
389 an unavailable PC. */
390
391 extern int get_frame_func_if_available (struct frame_info *fi, CORE_ADDR *);
392
393 /* Closely related to the resume address, various symbol table
394 attributes that are determined by the PC. Note that for a normal
395 frame, the PC refers to the resume address after the return, and
396 not the call instruction. In such a case, the address is adjusted
397 so that it (approximately) identifies the call site (and not the
398 return site).
399
400 NOTE: cagney/2002-11-28: The frame cache could be used to cache the
401 computed value. Working on the assumption that the bottle-neck is
402 in the single step code, and that code causes the frame cache to be
403 constantly flushed, caching things in a frame is probably of little
404 benefit. As they say `show us the numbers'.
405
406 NOTE: cagney/2002-11-28: Plenty more where this one came from:
407 find_frame_block(), find_frame_partial_function(),
408 find_frame_symtab(), find_frame_function(). Each will need to be
409 carefully considered to determine if the real intent was for it to
410 apply to the PC or the adjusted PC. */
411 extern symtab_and_line find_frame_sal (frame_info *frame);
412
413 /* Set the current source and line to the location given by frame
414 FRAME, if possible. */
415
416 void set_current_sal_from_frame (struct frame_info *);
417
418 /* Return the frame base (what ever that is) (DEPRECATED).
419
420 Old code was trying to use this single method for two conflicting
421 purposes. Such code needs to be updated to use either of:
422
423 get_frame_id: A low level frame unique identifier, that consists of
424 both a stack and a function address, that can be used to uniquely
425 identify a frame. This value is determined by the frame's
426 low-level unwinder, the stack part [typically] being the
427 top-of-stack of the previous frame, and the function part being the
428 function's start address. Since the correct identification of a
429 frameless function requires both a stack and function address,
430 the old get_frame_base method was not sufficient.
431
432 get_frame_base_address: get_frame_locals_address:
433 get_frame_args_address: A set of high-level debug-info dependant
434 addresses that fall within the frame. These addresses almost
435 certainly will not match the stack address part of a frame ID (as
436 returned by get_frame_base).
437
438 This replaced: frame->frame; */
439
440 extern CORE_ADDR get_frame_base (struct frame_info *);
441
442 /* Return the per-frame unique identifer. Can be used to relocate a
443 frame after a frame cache flush (and other similar operations). If
444 FI is NULL, return the null_frame_id.
445
446 NOTE: kettenis/20040508: These functions return a structure. On
447 platforms where structures are returned in static storage (vax,
448 m68k), this may trigger compiler bugs in code like:
449
450 if (frame_id_eq (get_frame_id (l), get_frame_id (r)))
451
452 where the return value from the first get_frame_id (l) gets
453 overwritten by the second get_frame_id (r). Please avoid writing
454 code like this. Use code like:
455
456 struct frame_id id = get_frame_id (l);
457 if (frame_id_eq (id, get_frame_id (r)))
458
459 instead, since that avoids the bug. */
460 extern struct frame_id get_frame_id (struct frame_info *fi);
461 extern struct frame_id get_stack_frame_id (struct frame_info *fi);
462 extern struct frame_id frame_unwind_caller_id (struct frame_info *next_frame);
463
464 /* Assuming that a frame is `normal', return its base-address, or 0 if
465 the information isn't available. NOTE: This address is really only
466 meaningful to the frame's high-level debug info. */
467 extern CORE_ADDR get_frame_base_address (struct frame_info *);
468
469 /* Assuming that a frame is `normal', return the base-address of the
470 local variables, or 0 if the information isn't available. NOTE:
471 This address is really only meaningful to the frame's high-level
472 debug info. Typically, the argument and locals share a single
473 base-address. */
474 extern CORE_ADDR get_frame_locals_address (struct frame_info *);
475
476 /* Assuming that a frame is `normal', return the base-address of the
477 parameter list, or 0 if that information isn't available. NOTE:
478 This address is really only meaningful to the frame's high-level
479 debug info. Typically, the argument and locals share a single
480 base-address. */
481 extern CORE_ADDR get_frame_args_address (struct frame_info *);
482
483 /* The frame's level: 0 for innermost, 1 for its caller, ...; or -1
484 for an invalid frame). */
485 extern int frame_relative_level (struct frame_info *fi);
486
487 /* Return the frame's type. */
488
489 extern enum frame_type get_frame_type (struct frame_info *);
490
491 /* Return the frame's program space. */
492 extern struct program_space *get_frame_program_space (struct frame_info *);
493
494 /* Unwind THIS frame's program space from the NEXT frame. */
495 extern struct program_space *frame_unwind_program_space (struct frame_info *);
496
497 class address_space;
498
499 /* Return the frame's address space. */
500 extern const address_space *get_frame_address_space (struct frame_info *);
501
502 /* For frames where we can not unwind further, describe why. */
503
504 enum unwind_stop_reason
505 {
506 #define SET(name, description) name,
507 #define FIRST_ENTRY(name) UNWIND_FIRST = name,
508 #define LAST_ENTRY(name) UNWIND_LAST = name,
509 #define FIRST_ERROR(name) UNWIND_FIRST_ERROR = name,
510
511 #include "unwind_stop_reasons.def"
512 #undef SET
513 #undef FIRST_ENTRY
514 #undef LAST_ENTRY
515 #undef FIRST_ERROR
516 };
517
518 /* Return the reason why we can't unwind past this frame. */
519
520 enum unwind_stop_reason get_frame_unwind_stop_reason (struct frame_info *);
521
522 /* Translate a reason code to an informative string. This converts the
523 generic stop reason codes into a generic string describing the code.
524 For a possibly frame specific string explaining the stop reason, use
525 FRAME_STOP_REASON_STRING instead. */
526
527 const char *unwind_stop_reason_to_string (enum unwind_stop_reason);
528
529 /* Return a possibly frame specific string explaining why the unwind
530 stopped here. E.g., if unwinding tripped on a memory error, this
531 will return the error description string, which includes the address
532 that we failed to access. If there's no specific reason stored for
533 a frame then a generic reason string will be returned.
534
535 Should only be called for frames that don't have a previous frame. */
536
537 const char *frame_stop_reason_string (struct frame_info *);
538
539 /* Unwind the stack frame so that the value of REGNUM, in the previous
540 (up, older) frame is returned. If VALUEP is NULL, don't
541 fetch/compute the value. Instead just return the location of the
542 value. */
543 extern void frame_register_unwind (struct frame_info *frame, int regnum,
544 int *optimizedp, int *unavailablep,
545 enum lval_type *lvalp,
546 CORE_ADDR *addrp, int *realnump,
547 gdb_byte *valuep);
548
549 /* Fetch a register from this, or unwind a register from the next
550 frame. Note that the get_frame methods are wrappers to
551 frame->next->unwind. They all [potentially] throw an error if the
552 fetch fails. The value methods never return NULL, but usually
553 do return a lazy value. */
554
555 extern void frame_unwind_register (struct frame_info *frame,
556 int regnum, gdb_byte *buf);
557 extern void get_frame_register (struct frame_info *frame,
558 int regnum, gdb_byte *buf);
559
560 struct value *frame_unwind_register_value (struct frame_info *frame,
561 int regnum);
562 struct value *get_frame_register_value (struct frame_info *frame,
563 int regnum);
564
565 extern LONGEST frame_unwind_register_signed (struct frame_info *frame,
566 int regnum);
567 extern LONGEST get_frame_register_signed (struct frame_info *frame,
568 int regnum);
569 extern ULONGEST frame_unwind_register_unsigned (struct frame_info *frame,
570 int regnum);
571 extern ULONGEST get_frame_register_unsigned (struct frame_info *frame,
572 int regnum);
573
574 /* Read a register from this, or unwind a register from the next
575 frame. Note that the read_frame methods are wrappers to
576 get_frame_register_value, that do not throw if the result is
577 optimized out or unavailable. */
578
579 extern int read_frame_register_unsigned (struct frame_info *frame,
580 int regnum, ULONGEST *val);
581
582 /* Get the value of the register that belongs to this FRAME. This
583 function is a wrapper to the call sequence ``frame_register_unwind
584 (get_next_frame (FRAME))''. As per frame_register_unwind(), if
585 VALUEP is NULL, the registers value is not fetched/computed. */
586
587 extern void frame_register (struct frame_info *frame, int regnum,
588 int *optimizedp, int *unavailablep,
589 enum lval_type *lvalp,
590 CORE_ADDR *addrp, int *realnump,
591 gdb_byte *valuep);
592
593 /* The reverse. Store a register value relative to the specified
594 frame. Note: this call makes the frame's state undefined. The
595 register and frame caches must be flushed. */
596 extern void put_frame_register (struct frame_info *frame, int regnum,
597 const gdb_byte *buf);
598
599 /* Read LEN bytes from one or multiple registers starting with REGNUM
600 in frame FRAME, starting at OFFSET, into BUF. If the register
601 contents are optimized out or unavailable, set *OPTIMIZEDP,
602 *UNAVAILABLEP accordingly. */
603 extern int get_frame_register_bytes (struct frame_info *frame, int regnum,
604 CORE_ADDR offset, int len,
605 gdb_byte *myaddr,
606 int *optimizedp, int *unavailablep);
607
608 /* Write LEN bytes to one or multiple registers starting with REGNUM
609 in frame FRAME, starting at OFFSET, into BUF. */
610 extern void put_frame_register_bytes (struct frame_info *frame, int regnum,
611 CORE_ADDR offset, int len,
612 const gdb_byte *myaddr);
613
614 /* Unwind the PC. Strictly speaking return the resume address of the
615 calling frame. For GDB, `pc' is the resume address and not a
616 specific register. */
617
618 extern CORE_ADDR frame_unwind_caller_pc (struct frame_info *frame);
619
620 /* Discard the specified frame. Restoring the registers to the state
621 of the caller. */
622 extern void frame_pop (struct frame_info *frame);
623
624 /* Return memory from the specified frame. A frame knows its thread /
625 LWP and hence can find its way down to a target. The assumption
626 here is that the current and previous frame share a common address
627 space.
628
629 If the memory read fails, these methods throw an error.
630
631 NOTE: cagney/2003-06-03: Should there be unwind versions of these
632 methods? That isn't clear. Can code, for instance, assume that
633 this and the previous frame's memory or architecture are identical?
634 If architecture / memory changes are always separated by special
635 adaptor frames this should be ok. */
636
637 extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr,
638 gdb_byte *buf, int len);
639 extern LONGEST get_frame_memory_signed (struct frame_info *this_frame,
640 CORE_ADDR memaddr, int len);
641 extern ULONGEST get_frame_memory_unsigned (struct frame_info *this_frame,
642 CORE_ADDR memaddr, int len);
643
644 /* Same as above, but return non-zero when the entire memory read
645 succeeds, zero otherwize. */
646 extern int safe_frame_unwind_memory (struct frame_info *this_frame,
647 CORE_ADDR addr, gdb_byte *buf, int len);
648
649 /* Return this frame's architecture. */
650 extern struct gdbarch *get_frame_arch (struct frame_info *this_frame);
651
652 /* Return the previous frame's architecture. */
653 extern struct gdbarch *frame_unwind_arch (struct frame_info *frame);
654
655 /* Return the previous frame's architecture, skipping inline functions. */
656 extern struct gdbarch *frame_unwind_caller_arch (struct frame_info *frame);
657
658
659 /* Values for the source flag to be used in print_frame_info_base(). */
660 enum print_what
661 {
662 /* Print only the source line, like in stepi. */
663 SRC_LINE = -1,
664 /* Print only the location, i.e. level, address (sometimes)
665 function, args, file, line, line num. */
666 LOCATION,
667 /* Print both of the above. */
668 SRC_AND_LOC,
669 /* Print location only, but always include the address. */
670 LOC_AND_ADDRESS
671 };
672
673 /* Allocate zero initialized memory from the frame cache obstack.
674 Appendices to the frame info (such as the unwind cache) should
675 allocate memory using this method. */
676
677 extern void *frame_obstack_zalloc (unsigned long size);
678 #define FRAME_OBSTACK_ZALLOC(TYPE) \
679 ((TYPE *) frame_obstack_zalloc (sizeof (TYPE)))
680 #define FRAME_OBSTACK_CALLOC(NUMBER,TYPE) \
681 ((TYPE *) frame_obstack_zalloc ((NUMBER) * sizeof (TYPE)))
682
683 /* Create a regcache, and copy the frame's registers into it. */
684 std::unique_ptr<struct regcache> frame_save_as_regcache
685 (struct frame_info *this_frame);
686
687 extern const struct block *get_frame_block (struct frame_info *,
688 CORE_ADDR *addr_in_block);
689
690 /* Return the `struct block' that belongs to the selected thread's
691 selected frame. If the inferior has no state, return NULL.
692
693 NOTE: cagney/2002-11-29:
694
695 No state? Does the inferior have any execution state (a core file
696 does, an executable does not). At present the code tests
697 `target_has_stack' but I'm left wondering if it should test
698 `target_has_registers' or, even, a merged target_has_state.
699
700 Should it look at the most recently specified SAL? If the target
701 has no state, should this function try to extract a block from the
702 most recently selected SAL? That way `list foo' would give it some
703 sort of reference point. Then again, perhaps that would confuse
704 things.
705
706 Calls to this function can be broken down into two categories: Code
707 that uses the selected block as an additional, but optional, data
708 point; Code that uses the selected block as a prop, when it should
709 have the relevant frame/block/pc explicitly passed in.
710
711 The latter can be eliminated by correctly parameterizing the code,
712 the former though is more interesting. Per the "address" command,
713 it occurs in the CLI code and makes it possible for commands to
714 work, even when the inferior has no state. */
715
716 extern const struct block *get_selected_block (CORE_ADDR *addr_in_block);
717
718 extern struct symbol *get_frame_function (struct frame_info *);
719
720 extern CORE_ADDR get_pc_function_start (CORE_ADDR);
721
722 extern struct frame_info *find_relative_frame (struct frame_info *, int *);
723
724 /* Wrapper over print_stack_frame modifying current_uiout with UIOUT for
725 the function call. */
726
727 extern void print_stack_frame_to_uiout (struct ui_out *uiout,
728 struct frame_info *, int print_level,
729 enum print_what print_what,
730 int set_current_sal);
731
732 extern void print_stack_frame (struct frame_info *, int print_level,
733 enum print_what print_what,
734 int set_current_sal);
735
736 extern void print_frame_info (struct frame_info *, int print_level,
737 enum print_what print_what, int args,
738 int set_current_sal);
739
740 extern struct frame_info *block_innermost_frame (const struct block *);
741
742 extern int deprecated_frame_register_read (struct frame_info *frame, int regnum,
743 gdb_byte *buf);
744
745 /* From stack.c. */
746
747 extern const char print_entry_values_no[];
748 extern const char print_entry_values_only[];
749 extern const char print_entry_values_preferred[];
750 extern const char print_entry_values_if_needed[];
751 extern const char print_entry_values_both[];
752 extern const char print_entry_values_compact[];
753 extern const char print_entry_values_default[];
754 extern const char *print_entry_values;
755
756 /* Inferior function parameter value read in from a frame. */
757
758 struct frame_arg
759 {
760 /* Symbol for this parameter used for example for its name. */
761 struct symbol *sym;
762
763 /* Value of the parameter. It is NULL if ERROR is not NULL; if both VAL and
764 ERROR are NULL this parameter's value should not be printed. */
765 struct value *val;
766
767 /* String containing the error message, it is more usually NULL indicating no
768 error occured reading this parameter. */
769 char *error;
770
771 /* One of the print_entry_values_* entries as appropriate specifically for
772 this frame_arg. It will be different from print_entry_values. With
773 print_entry_values_no this frame_arg should be printed as a normal
774 parameter. print_entry_values_only says it should be printed as entry
775 value parameter. print_entry_values_compact says it should be printed as
776 both as a normal parameter and entry values parameter having the same
777 value - print_entry_values_compact is not permitted fi ui_out_is_mi_like_p
778 (in such case print_entry_values_no and print_entry_values_only is used
779 for each parameter kind specifically. */
780 const char *entry_kind;
781 };
782
783 extern void read_frame_arg (struct symbol *sym, struct frame_info *frame,
784 struct frame_arg *argp,
785 struct frame_arg *entryargp);
786 extern void read_frame_local (struct symbol *sym, struct frame_info *frame,
787 struct frame_arg *argp);
788
789 extern void info_args_command (const char *, int);
790
791 extern void info_locals_command (const char *, int);
792
793 extern void return_command (const char *, int);
794
795 /* Set FRAME's unwinder temporarily, so that we can call a sniffer.
796 If sniffing fails, the caller should be sure to call
797 frame_cleanup_after_sniffer. */
798
799 extern void frame_prepare_for_sniffer (struct frame_info *frame,
800 const struct frame_unwind *unwind);
801
802 /* Clean up after a failed (wrong unwinder) attempt to unwind past
803 FRAME. */
804
805 extern void frame_cleanup_after_sniffer (struct frame_info *frame);
806
807 /* Notes (cagney/2002-11-27, drow/2003-09-06):
808
809 You might think that calls to this function can simply be replaced by a
810 call to get_selected_frame().
811
812 Unfortunately, it isn't that easy.
813
814 The relevant code needs to be audited to determine if it is
815 possible (or practical) to instead pass the applicable frame in as a
816 parameter. For instance, DEPRECATED_DO_REGISTERS_INFO() relied on
817 the deprecated_selected_frame global, while its replacement,
818 PRINT_REGISTERS_INFO(), is parameterized with the selected frame.
819 The only real exceptions occur at the edge (in the CLI code) where
820 user commands need to pick up the selected frame before proceeding.
821
822 There are also some functions called with a NULL frame meaning either "the
823 program is not running" or "use the selected frame".
824
825 This is important. GDB is trying to stamp out the hack:
826
827 saved_frame = deprecated_safe_get_selected_frame ();
828 select_frame (...);
829 hack_using_global_selected_frame ();
830 select_frame (saved_frame);
831
832 Take care!
833
834 This function calls get_selected_frame if the inferior should have a
835 frame, or returns NULL otherwise. */
836
837 extern struct frame_info *deprecated_safe_get_selected_frame (void);
838
839 /* Create a frame using the specified BASE and PC. */
840
841 extern struct frame_info *create_new_frame (CORE_ADDR base, CORE_ADDR pc);
842
843 /* Return true if the frame unwinder for frame FI is UNWINDER; false
844 otherwise. */
845
846 extern int frame_unwinder_is (struct frame_info *fi,
847 const struct frame_unwind *unwinder);
848
849 /* Return the language of FRAME. */
850
851 extern enum language get_frame_language (struct frame_info *frame);
852
853 /* Return the first non-tailcall frame above FRAME or FRAME if it is not a
854 tailcall frame. Return NULL if FRAME is the start of a tailcall-only
855 chain. */
856
857 extern struct frame_info *skip_tailcall_frames (struct frame_info *frame);
858
859 /* Return the first frame above FRAME or FRAME of which the code is
860 writable. */
861
862 extern struct frame_info *skip_unwritable_frames (struct frame_info *frame);
863
864 #endif /* !defined (FRAME_H) */
gdbarch
Definition: gdbarch.c:127
frame_id::special_addr_p
unsigned int special_addr_p
Definition: frame.h:158
frame_id::special_addr
CORE_ADDR special_addr
Definition: frame.h:153
SENTINEL_FRAME
Definition: frame.h:260
get_frame_block
const struct block * get_frame_block(struct frame_info *, CORE_ADDR *addr_in_block)
Definition: blockframe.c:55
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void return_command(const char *, int)
Definition: stack.c:2366
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int get_frame_register_bytes(struct frame_info *frame, int regnum, CORE_ADDR offset, int len, gdb_byte *myaddr, int *optimizedp, int *unavailablep)
Definition: frame.c:1388
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struct frame_info * skip_unwritable_frames(struct frame_info *frame)
Definition: frame.c:459
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struct frame_id frame_id_build_special(CORE_ADDR stack_addr, CORE_ADDR code_addr, CORE_ADDR special_addr)
Definition: frame.c:580
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struct frame_info * get_selected_frame_if_set(void)
Definition: frame.c:1657
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__extension__ enum frame_id_stack_status stack_status
Definition: frame.h:156
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bfd_vma CORE_ADDR
Definition: common-types.h:41
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struct symbol * sym
Definition: frame.h:761
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Definition: frame.h:141
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Definition: frame.h:765
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Definition: frame.h:257
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const char * entry_kind
Definition: frame.h:780
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Definition: frame.c:2552
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Definition: frame.c:1081
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int get_frame_address_in_block_if_available(struct frame_info *this_frame, CORE_ADDR *pc)
Definition: frame.c:2467
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Definition: frame.h:663
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CORE_ADDR get_frame_locals_address(struct frame_info *)
Definition: frame.c:2566
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Definition: frame.c:2782
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const char print_entry_values_default[]
Definition: stack.c:76
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struct frame_info * block_innermost_frame(const struct block *)
Definition: blockframe.c:331
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struct value * frame_unwind_register_value(struct frame_info *frame, int regnum)
Definition: frame.c:1172
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struct frame_info * get_next_frame_sentinel_okay(struct frame_info *)
Definition: frame.c:1784
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Definition: frame.c:2407
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Definition: frame.c:2681
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Definition: frame.h:91
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Definition: blockframe.c:118
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Definition: frame.h:255
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Definition: frame.c:2867
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Definition: frame.c:85
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Definition: frame.h:504
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Definition: frame.c:1145
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Definition: frame.c:803
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Definition: blockframe.c:86
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Definition: frame.h:758
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const char * print_entry_values
Definition: stack.c:88
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Definition: frame.c:2831
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Definition: ui-file.h:26
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void set_current_sal_from_frame(struct frame_info *)
Definition: stack.c:725
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Definition: frame.c:2254
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Definition: defs.h:378
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struct frame_id frame_id_build_wild(CORE_ADDR stack_addr)
Definition: frame.c:636
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const char print_entry_values_if_needed[]
Definition: stack.c:73
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Definition: frame.c:549
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Definition: frame.c:1031
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Definition: frame.c:2661
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Definition: frame.c:2815
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Definition: frame.c:1244
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Definition: frame.c:274
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Definition: frame.c:2897
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Definition: frame.c:1238
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Definition: frame.c:1771
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Definition: frame.h:247
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CORE_ADDR get_frame_base(struct frame_info *)
Definition: frame.c:2544
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struct frame_info * deprecated_safe_get_selected_frame(void)
Definition: frame.c:1667
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Definition: frame.c:1001
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Definition: frame.c:2671
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Definition: frame.c:1314
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const char print_entry_values_no[]
Definition: stack.c:70
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Definition: frame.h:244
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Definition: frame.c:1470
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Definition: stack.c:2110
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Definition: frame.c:944
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Definition: stack.c:2234
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Definition: frame.h:666
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struct frame_id get_prev_frame_id_by_id(struct frame_id id)
Definition: frame.c:2360
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Definition: frame.h:240
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const char print_entry_values_compact[]
Definition: stack.c:75
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ULONGEST get_frame_register_unsigned(struct frame_info *frame, int regnum)
Definition: frame.c:1308
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Definition: frame.c:1638
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Definition: frame.c:1809
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Definition: frame.c:674
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Definition: frame.c:2610
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enum unwind_stop_reason get_frame_unwind_stop_reason(struct frame_info *)
Definition: frame.c:2803
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Definition: frame.c:2697
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Definition: frame.h:668
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Definition: frame.c:520
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Definition: frame.h:88
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Definition: frame.c:1722
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Definition: frame.c:1609
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Definition: frame.h:660
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Definition: frame.h:126
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Definition: frame.c:2599
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Definition: frame.c:1279
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Definition: aarch64-tdep.c:77
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Definition: frame-base.h:58
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Definition: frame.c:575
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Definition: frame.c:1021
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Definition: stack.c:314
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Definition: frame.h:769
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Definition: block.h:60
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Definition: frame.c:1165
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Definition: value.c:169
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Definition: ui-out.h:77
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unsigned int code_addr_p
Definition: frame.h:157
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Definition: frame.h:164
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Definition: stack.c:165
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Definition: stack.c:337
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Definition: symtab.h:1746
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Definition: frame.c:1552
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Definition: frame.c:327
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Definition: common-types.h:38
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Definition: frame.c:1563
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const char print_entry_values_only[]
Definition: stack.c:71
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Definition: frame.h:250
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Definition: frame.c:2619
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Definition: frame.c:1125
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Definition: progspace.h:216
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Definition: frame.c:665
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Definition: frame.h:99
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Definition: frame.c:1273
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Definition: frame.c:957
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Definition: frame.c:2654
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Definition: agent.c:65
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Definition: frame.c:2725
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const char print_entry_values_both[]
Definition: stack.c:74
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Definition: frame.c:2487
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Definition: frame.h:84
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Definition: frame.c:646
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Definition: frame.c:2383
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Definition: frame-unwind.h:144
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Definition: frame.c:474
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const struct block * get_selected_block(CORE_ADDR *addr_in_block)
Definition: stack.c:2216
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Definition: common-types.h:53
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const struct frame_id sentinel_frame_id
Definition: frame.c:576
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Definition: frame.c:1372
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const address_space * get_frame_address_space(struct frame_info *)
Definition: frame.c:2646
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Definition: defs.h:203
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Definition: frame.c:2376
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const struct frame_base * base
Definition: frame.c:142
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Definition: stack.c:72
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Definition: frame.c:1334
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Definition: symtab.h:1049
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Definition: frame.h:94
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Definition: frame.h:252
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const struct frame_id outer_frame_id
Definition: frame.c:577
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Definition: frame.h:670
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Definition: stack.c:786
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Definition: frame.c:624
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Definition: stack.c:2192
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Definition: frame.c:2740
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struct frame_id frame_id_build_unavailable_stack_special(CORE_ADDR code_addr, CORE_ADDR special_addr)
Definition: frame.c:610
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struct frame_id frame_id_build_unavailable_stack(CORE_ADDR code_addr)
Definition: frame.c:597
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Definition: go32-nat.c:242
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Definition: frame.h:111
LONGEST
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Definition: common-types.h:52
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Definition: stack.c:149
program_space
Definition: progspace.h:137
frame_unwind_caller_id
struct frame_id frame_unwind_caller_id(struct frame_info *next_frame)
Definition: frame.c:555
select_frame
void select_frame(struct frame_info *)
Definition: frame.c:1677