1 /* Definitions for dealing with stack frames, for GDB, the GNU debugger.
3 Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997,
4 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010
5 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #if !defined (FRAME_H)
25 /* The following is the intended naming schema for frame functions.
26 It isn't 100% consistent, but it is aproaching that. Frame naming
31 get_frame_WHAT...(): Get WHAT from the THIS frame (functionaly
32 equivalent to THIS->next->unwind->what)
34 frame_unwind_WHAT...(): Unwind THIS frame's WHAT from the NEXT
37 frame_unwind_caller_WHAT...(): Unwind WHAT for NEXT stack frame's
38 real caller. Any inlined functions in NEXT's stack frame are
39 skipped. Use these to ignore any potentially inlined functions,
40 e.g. inlined into the first instruction of a library trampoline.
42 get_stack_frame_WHAT...(): Get WHAT for THIS frame, but if THIS is
43 inlined, skip to the containing stack frame.
45 put_frame_WHAT...(): Put a value into this frame (unsafe, need to
46 invalidate the frame / regcache afterwards) (better name more
47 strongly hinting at its unsafeness)
49 safe_....(): Safer version of various functions, doesn't throw an
50 error (leave this for later?). Returns non-zero / non-NULL if the
51 request succeeds, zero / NULL otherwize.
55 void /frame/_WHAT(): Read WHAT's value into the buffer parameter.
57 ULONGEST /frame/_WHAT_unsigned(): Return an unsigned value (the
58 alternative is *frame_unsigned_WHAT).
60 LONGEST /frame/_WHAT_signed(): Return WHAT signed value.
64 /frame/_memory* (frame, coreaddr, len [, buf]): Extract/return
67 /frame/_register* (frame, regnum [, buf]): extract/return register.
69 CORE_ADDR /frame/_{pc,sp,...} (frame): Resume address, innner most
74 struct symtab_and_line;
81 /* The frame object. */
85 /* The frame object's ID. This provides a per-frame unique identifier
86 that can be used to relocate a `struct frame_info' after a target
87 resume or a frame cache destruct. It of course assumes that the
88 inferior hasn't unwound the stack past that frame. */
92 /* The frame's stack address. This shall be constant through out
93 the lifetime of a frame. Note that this requirement applies to
94 not just the function body, but also the prologue and (in theory
95 at least) the epilogue. Since that value needs to fall either on
96 the boundary, or within the frame's address range, the frame's
97 outer-most address (the inner-most address of the previous frame)
98 is used. Watch out for all the legacy targets that still use the
99 function pointer register or stack pointer register. They are
102 This field is valid only if stack_addr_p is true. Otherwise, this
103 frame represents the null frame. */
104 CORE_ADDR stack_addr;
106 /* The frame's code address. This shall be constant through out the
107 lifetime of the frame. While the PC (a.k.a. resume address)
108 changes as the function is executed, this code address cannot.
109 Typically, it is set to the address of the entry point of the
110 frame's function (as returned by get_frame_func).
112 For inlined functions (INLINE_DEPTH != 0), this is the address of
113 the first executed instruction in the block corresponding to the
116 This field is valid only if code_addr_p is true. Otherwise, this
117 frame is considered to have a wildcard code address, i.e. one that
118 matches every address value in frame comparisons. */
121 /* The frame's special address. This shall be constant through out the
122 lifetime of the frame. This is used for architectures that may have
123 frames that do not change the stack but are still distinct and have
124 some form of distinct identifier (e.g. the ia64 which uses a 2nd
125 stack for registers). This field is treated as unordered - i.e. will
126 not be used in frame ordering comparisons.
128 This field is valid only if special_addr_p is true. Otherwise, this
129 frame is considered to have a wildcard special address, i.e. one that
130 matches every address value in frame comparisons. */
131 CORE_ADDR special_addr;
133 /* Flags to indicate the above fields have valid contents. */
134 unsigned int stack_addr_p : 1;
135 unsigned int code_addr_p : 1;
136 unsigned int special_addr_p : 1;
138 /* The inline depth of this frame. A frame representing a "called"
139 inlined function will have this set to a nonzero value. */
143 /* Methods for constructing and comparing Frame IDs. */
145 /* For convenience. All fields are zero. This means "there is no frame". */
146 extern const struct frame_id null_frame_id;
148 /* This means "there is no frame ID, but there is a frame". It should be
149 replaced by best-effort frame IDs for the outermost frame, somehow.
150 The implementation is only special_addr_p set. */
151 extern const struct frame_id outer_frame_id;
153 /* Flag to control debugging. */
155 extern int frame_debug;
157 /* Construct a frame ID. The first parameter is the frame's constant
158 stack address (typically the outer-bound), and the second the
159 frame's constant code address (typically the entry point).
160 The special identifier address is set to indicate a wild card. */
161 extern struct frame_id frame_id_build (CORE_ADDR stack_addr,
162 CORE_ADDR code_addr);
164 /* Construct a special frame ID. The first parameter is the frame's constant
165 stack address (typically the outer-bound), the second is the
166 frame's constant code address (typically the entry point),
167 and the third parameter is the frame's special identifier address. */
168 extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr,
170 CORE_ADDR special_addr);
172 /* Construct a wild card frame ID. The parameter is the frame's constant
173 stack address (typically the outer-bound). The code address as well
174 as the special identifier address are set to indicate wild cards. */
175 extern struct frame_id frame_id_build_wild (CORE_ADDR stack_addr);
177 /* Returns non-zero when L is a valid frame (a valid frame has a
178 non-zero .base). The outermost frame is valid even without an
180 extern int frame_id_p (struct frame_id l);
182 /* Returns non-zero when L is a valid frame representing an inlined
184 extern int frame_id_inlined_p (struct frame_id l);
186 /* Returns non-zero when L and R identify the same frame, or, if
187 either L or R have a zero .func, then the same frame base. */
188 extern int frame_id_eq (struct frame_id l, struct frame_id r);
190 /* Write the internal representation of a frame ID on the specified
192 extern void fprint_frame_id (struct ui_file *file, struct frame_id id);
195 /* Frame types. Some are real, some are signal trampolines, and some
196 are completely artificial (dummy). */
200 /* A true stack frame, created by the target program during normal
203 /* A fake frame, created by GDB when performing an inferior function
206 /* A frame representing an inlined function, associated with an
207 upcoming (next, inner, younger) NORMAL_FRAME. */
209 /* In a signal handler, various OSs handle this in various ways.
210 The main thing is that the frame may be far from normal. */
212 /* Fake frame representing a cross-architecture call. */
214 /* Sentinel or registers frame. This frame obtains register values
215 direct from the inferior's registers. */
219 /* For every stopped thread, GDB tracks two frames: current and
220 selected. Current frame is the inner most frame of the selected
221 thread. Selected frame is the one being examined by the the GDB
222 CLI (selected using `up', `down', ...). The frames are created
223 on-demand (via get_prev_frame()) and then held in a frame cache. */
224 /* FIXME: cagney/2002-11-28: Er, there is a lie here. If you do the
225 sequence: `thread 1; up; thread 2; thread 1' you lose thread 1's
226 selected frame. At present GDB only tracks the selected frame of
227 the current thread. But be warned, that might change. */
228 /* FIXME: cagney/2002-11-14: At any time, only one thread's selected
229 and current frame can be active. Switching threads causes gdb to
230 discard all that cached frame information. Ulgh! Instead, current
231 and selected frame should be bound to a thread. */
233 /* On demand, create the inner most frame using information found in
234 the inferior. If the inner most frame can't be created, throw an
236 extern struct frame_info *get_current_frame (void);
238 /* Does the current target interface have enough state to be able to
239 query the current inferior for frame info, and is the inferior in a
240 state where that is possible? */
241 extern int has_stack_frames (void);
243 /* Invalidates the frame cache (this function should have been called
244 invalidate_cached_frames).
246 FIXME: cagney/2002-11-28: There should be two methods: one that
247 reverts the thread's selected frame back to current frame (for when
248 the inferior resumes) and one that does not (for when the user
249 modifies the target invalidating the frame cache). */
250 extern void reinit_frame_cache (void);
252 /* On demand, create the selected frame and then return it. If the
253 selected frame can not be created, this function prints then throws
254 an error. When MESSAGE is non-NULL, use it for the error message,
255 otherwize use a generic error message. */
256 /* FIXME: cagney/2002-11-28: At present, when there is no selected
257 frame, this function always returns the current (inner most) frame.
258 It should instead, when a thread has previously had its frame
259 selected (but not resumed) and the frame cache invalidated, find
260 and then return that thread's previously selected frame. */
261 extern struct frame_info *get_selected_frame (const char *message);
263 /* Select a specific frame. NULL, apparently implies re-select the
265 extern void select_frame (struct frame_info *);
267 /* Given a FRAME, return the next (more inner, younger) or previous
268 (more outer, older) frame. */
269 extern struct frame_info *get_prev_frame (struct frame_info *);
270 extern struct frame_info *get_next_frame (struct frame_info *);
272 /* Given a frame's ID, relocate the frame. Returns NULL if the frame
274 extern struct frame_info *frame_find_by_id (struct frame_id id);
276 /* Base attributes of a frame: */
278 /* The frame's `resume' address. Where the program will resume in
281 This replaced: frame->pc; */
282 extern CORE_ADDR get_frame_pc (struct frame_info *);
284 /* An address (not necessarily aligned to an instruction boundary)
285 that falls within THIS frame's code block.
287 When a function call is the last statement in a block, the return
288 address for the call may land at the start of the next block.
289 Similarly, if a no-return function call is the last statement in
290 the function, the return address may end up pointing beyond the
291 function, and possibly at the start of the next function.
293 These methods make an allowance for this. For call frames, this
294 function returns the frame's PC-1 which "should" be an address in
295 the frame's block. */
297 extern CORE_ADDR get_frame_address_in_block (struct frame_info *this_frame);
299 /* The frame's inner-most bound. AKA the stack-pointer. Confusingly
300 known as top-of-stack. */
302 extern CORE_ADDR get_frame_sp (struct frame_info *);
304 /* Following on from the `resume' address. Return the entry point
305 address of the function containing that resume address, or zero if
306 that function isn't known. */
307 extern CORE_ADDR get_frame_func (struct frame_info *fi);
309 /* Closely related to the resume address, various symbol table
310 attributes that are determined by the PC. Note that for a normal
311 frame, the PC refers to the resume address after the return, and
312 not the call instruction. In such a case, the address is adjusted
313 so that it (approximately) identifies the call site (and not the
316 NOTE: cagney/2002-11-28: The frame cache could be used to cache the
317 computed value. Working on the assumption that the bottle-neck is
318 in the single step code, and that code causes the frame cache to be
319 constantly flushed, caching things in a frame is probably of little
320 benefit. As they say `show us the numbers'.
322 NOTE: cagney/2002-11-28: Plenty more where this one came from:
323 find_frame_block(), find_frame_partial_function(),
324 find_frame_symtab(), find_frame_function(). Each will need to be
325 carefully considered to determine if the real intent was for it to
326 apply to the PC or the adjusted PC. */
327 extern void find_frame_sal (struct frame_info *frame,
328 struct symtab_and_line *sal);
330 /* Set the current source and line to the location given by frame
331 FRAME, if possible. When CENTER is true, adjust so the relevant
332 line is in the center of the next 'list'. */
334 void set_current_sal_from_frame (struct frame_info *, int);
336 /* Return the frame base (what ever that is) (DEPRECATED).
338 Old code was trying to use this single method for two conflicting
339 purposes. Such code needs to be updated to use either of:
341 get_frame_id: A low level frame unique identifier, that consists of
342 both a stack and a function address, that can be used to uniquely
343 identify a frame. This value is determined by the frame's
344 low-level unwinder, the stack part [typically] being the
345 top-of-stack of the previous frame, and the function part being the
346 function's start address. Since the correct identification of a
347 frameless function requires both the a stack and function address,
348 the old get_frame_base method was not sufficient.
350 get_frame_base_address: get_frame_locals_address:
351 get_frame_args_address: A set of high-level debug-info dependant
352 addresses that fall within the frame. These addresses almost
353 certainly will not match the stack address part of a frame ID (as
354 returned by get_frame_base).
356 This replaced: frame->frame; */
358 extern CORE_ADDR get_frame_base (struct frame_info *);
360 /* Return the per-frame unique identifer. Can be used to relocate a
361 frame after a frame cache flush (and other similar operations). If
362 FI is NULL, return the null_frame_id.
364 NOTE: kettenis/20040508: These functions return a structure. On
365 platforms where structures are returned in static storage (vax,
366 m68k), this may trigger compiler bugs in code like:
368 if (frame_id_eq (get_frame_id (l), get_frame_id (r)))
370 where the return value from the first get_frame_id (l) gets
371 overwritten by the second get_frame_id (r). Please avoid writing
372 code like this. Use code like:
374 struct frame_id id = get_frame_id (l);
375 if (frame_id_eq (id, get_frame_id (r)))
377 instead, since that avoids the bug. */
378 extern struct frame_id get_frame_id (struct frame_info *fi);
379 extern struct frame_id get_stack_frame_id (struct frame_info *fi);
380 extern struct frame_id frame_unwind_caller_id (struct frame_info *next_frame);
382 /* Assuming that a frame is `normal', return its base-address, or 0 if
383 the information isn't available. NOTE: This address is really only
384 meaningful to the frame's high-level debug info. */
385 extern CORE_ADDR get_frame_base_address (struct frame_info *);
387 /* Assuming that a frame is `normal', return the base-address of the
388 local variables, or 0 if the information isn't available. NOTE:
389 This address is really only meaningful to the frame's high-level
390 debug info. Typically, the argument and locals share a single
392 extern CORE_ADDR get_frame_locals_address (struct frame_info *);
394 /* Assuming that a frame is `normal', return the base-address of the
395 parameter list, or 0 if that information isn't available. NOTE:
396 This address is really only meaningful to the frame's high-level
397 debug info. Typically, the argument and locals share a single
399 extern CORE_ADDR get_frame_args_address (struct frame_info *);
401 /* The frame's level: 0 for innermost, 1 for its caller, ...; or -1
402 for an invalid frame). */
403 extern int frame_relative_level (struct frame_info *fi);
405 /* Return the frame's type. */
407 extern enum frame_type get_frame_type (struct frame_info *);
409 /* Return the frame's program space. */
410 extern struct program_space *get_frame_program_space (struct frame_info *);
412 /* Unwind THIS frame's program space from the NEXT frame. */
413 extern struct program_space *frame_unwind_program_space (struct frame_info *);
415 /* Return the frame's address space. */
416 extern struct address_space *get_frame_address_space (struct frame_info *);
418 /* For frames where we can not unwind further, describe why. */
420 enum unwind_stop_reason
422 /* No particular reason; either we haven't tried unwinding yet,
423 or we didn't fail. */
426 /* The previous frame's analyzer returns an invalid result
429 FIXME drow/2006-08-16: This is how GDB used to indicate end of
430 stack. We should migrate to a model where frames always have a
431 valid ID, and this becomes not just an error but an internal
432 error. But that's a project for another day. */
435 /* All the conditions after this point are considered errors;
436 abnormal stack termination. If a backtrace stops for one
437 of these reasons, we'll let the user know. This marker
438 is not a valid stop reason. */
441 /* This frame ID looks like it ought to belong to a NEXT frame,
442 but we got it for a PREV frame. Normally, this is a sign of
443 unwinder failure. It could also indicate stack corruption. */
446 /* This frame has the same ID as the previous one. That means
447 that unwinding further would almost certainly give us another
448 frame with exactly the same ID, so break the chain. Normally,
449 this is a sign of unwinder failure. It could also indicate
453 /* The frame unwinder didn't find any saved PC, but we needed
454 one to unwind further. */
458 /* Return the reason why we can't unwind past this frame. */
460 enum unwind_stop_reason get_frame_unwind_stop_reason (struct frame_info *);
462 /* Translate a reason code to an informative string. */
464 const char *frame_stop_reason_string (enum unwind_stop_reason);
466 /* Unwind the stack frame so that the value of REGNUM, in the previous
467 (up, older) frame is returned. If VALUEP is NULL, don't
468 fetch/compute the value. Instead just return the location of the
470 extern void frame_register_unwind (struct frame_info *frame, int regnum,
471 int *optimizedp, enum lval_type *lvalp,
472 CORE_ADDR *addrp, int *realnump,
475 /* Fetch a register from this, or unwind a register from the next
476 frame. Note that the get_frame methods are wrappers to
477 frame->next->unwind. They all [potentially] throw an error if the
478 fetch fails. The value methods never return NULL, but usually
479 do return a lazy value. */
481 extern void frame_unwind_register (struct frame_info *frame,
482 int regnum, gdb_byte *buf);
483 extern void get_frame_register (struct frame_info *frame,
484 int regnum, gdb_byte *buf);
486 struct value *frame_unwind_register_value (struct frame_info *frame,
488 struct value *get_frame_register_value (struct frame_info *frame,
491 extern LONGEST frame_unwind_register_signed (struct frame_info *frame,
493 extern LONGEST get_frame_register_signed (struct frame_info *frame,
495 extern ULONGEST frame_unwind_register_unsigned (struct frame_info *frame,
497 extern ULONGEST get_frame_register_unsigned (struct frame_info *frame,
501 /* Get the value of the register that belongs to this FRAME. This
502 function is a wrapper to the call sequence ``frame_register_unwind
503 (get_next_frame (FRAME))''. As per frame_register_unwind(), if
504 VALUEP is NULL, the registers value is not fetched/computed. */
506 extern void frame_register (struct frame_info *frame, int regnum,
507 int *optimizedp, enum lval_type *lvalp,
508 CORE_ADDR *addrp, int *realnump,
511 /* The reverse. Store a register value relative to the specified
512 frame. Note: this call makes the frame's state undefined. The
513 register and frame caches must be flushed. */
514 extern void put_frame_register (struct frame_info *frame, int regnum,
515 const gdb_byte *buf);
517 /* Read LEN bytes from one or multiple registers starting with REGNUM
518 in frame FRAME, starting at OFFSET, into BUF. */
519 extern int get_frame_register_bytes (struct frame_info *frame, int regnum,
520 CORE_ADDR offset, int len,
523 /* Write LEN bytes to one or multiple registers starting with REGNUM
524 in frame FRAME, starting at OFFSET, into BUF. */
525 extern void put_frame_register_bytes (struct frame_info *frame, int regnum,
526 CORE_ADDR offset, int len,
527 const gdb_byte *myaddr);
529 /* Unwind the PC. Strictly speaking return the resume address of the
530 calling frame. For GDB, `pc' is the resume address and not a
531 specific register. */
533 extern CORE_ADDR frame_unwind_caller_pc (struct frame_info *frame);
535 /* Discard the specified frame. Restoring the registers to the state
537 extern void frame_pop (struct frame_info *frame);
539 /* Return memory from the specified frame. A frame knows its thread /
540 LWP and hence can find its way down to a target. The assumption
541 here is that the current and previous frame share a common address
544 If the memory read fails, these methods throw an error.
546 NOTE: cagney/2003-06-03: Should there be unwind versions of these
547 methods? That isn't clear. Can code, for instance, assume that
548 this and the previous frame's memory or architecture are identical?
549 If architecture / memory changes are always separated by special
550 adaptor frames this should be ok. */
552 extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr,
553 gdb_byte *buf, int len);
554 extern LONGEST get_frame_memory_signed (struct frame_info *this_frame,
555 CORE_ADDR memaddr, int len);
556 extern ULONGEST get_frame_memory_unsigned (struct frame_info *this_frame,
557 CORE_ADDR memaddr, int len);
559 /* Same as above, but return non-zero when the entire memory read
560 succeeds, zero otherwize. */
561 extern int safe_frame_unwind_memory (struct frame_info *this_frame,
562 CORE_ADDR addr, gdb_byte *buf, int len);
564 /* Return this frame's architecture. */
565 extern struct gdbarch *get_frame_arch (struct frame_info *this_frame);
567 /* Return the previous frame's architecture. */
568 extern struct gdbarch *frame_unwind_arch (struct frame_info *frame);
570 /* Return the previous frame's architecture, skipping inline functions. */
571 extern struct gdbarch *frame_unwind_caller_arch (struct frame_info *frame);
574 /* Values for the source flag to be used in print_frame_info_base(). */
577 /* Print only the source line, like in stepi. */
579 /* Print only the location, i.e. level, address (sometimes)
580 function, args, file, line, line num. */
582 /* Print both of the above. */
584 /* Print location only, but always include the address. */
588 /* Allocate zero initialized memory from the frame cache obstack.
589 Appendices to the frame info (such as the unwind cache) should
590 allocate memory using this method. */
592 extern void *frame_obstack_zalloc (unsigned long size);
593 #define FRAME_OBSTACK_ZALLOC(TYPE) ((TYPE *) frame_obstack_zalloc (sizeof (TYPE)))
594 #define FRAME_OBSTACK_CALLOC(NUMBER,TYPE) ((TYPE *) frame_obstack_zalloc ((NUMBER) * sizeof (TYPE)))
596 /* Create a regcache, and copy the frame's registers into it. */
597 struct regcache *frame_save_as_regcache (struct frame_info *this_frame);
599 extern struct block *get_frame_block (struct frame_info *,
600 CORE_ADDR *addr_in_block);
602 /* Return the `struct block' that belongs to the selected thread's
603 selected frame. If the inferior has no state, return NULL.
605 NOTE: cagney/2002-11-29:
607 No state? Does the inferior have any execution state (a core file
608 does, an executable does not). At present the code tests
609 `target_has_stack' but I'm left wondering if it should test
610 `target_has_registers' or, even, a merged target_has_state.
612 Should it look at the most recently specified SAL? If the target
613 has no state, should this function try to extract a block from the
614 most recently selected SAL? That way `list foo' would give it some
615 sort of reference point. Then again, perhaps that would confuse
618 Calls to this function can be broken down into two categories: Code
619 that uses the selected block as an additional, but optional, data
620 point; Code that uses the selected block as a prop, when it should
621 have the relevant frame/block/pc explicitly passed in.
623 The latter can be eliminated by correctly parameterizing the code,
624 the former though is more interesting. Per the "address" command,
625 it occurs in the CLI code and makes it possible for commands to
626 work, even when the inferior has no state. */
628 extern struct block *get_selected_block (CORE_ADDR *addr_in_block);
630 extern struct symbol *get_frame_function (struct frame_info *);
632 extern CORE_ADDR get_pc_function_start (CORE_ADDR);
634 extern struct frame_info *find_relative_frame (struct frame_info *, int *);
636 extern void show_and_print_stack_frame (struct frame_info *fi, int print_level,
637 enum print_what print_what);
639 extern void print_stack_frame (struct frame_info *, int print_level,
640 enum print_what print_what);
642 extern void print_frame_info (struct frame_info *, int print_level,
643 enum print_what print_what, int args);
645 extern struct frame_info *block_innermost_frame (struct block *);
647 extern int deprecated_pc_in_call_dummy (struct gdbarch *gdbarch, CORE_ADDR pc);
649 /* FIXME: cagney/2003-02-02: Should be deprecated or replaced with a
650 function called get_frame_register_p(). This slightly weird (and
651 older) variant of get_frame_register() returns zero (indicating the
652 register is unavailable) if either: the register isn't cached; or
653 the register has been optimized out. Problem is, neither check is
654 exactly correct. A register can't be optimized out (it may not
655 have been saved as part of a function call); The fact that a
656 register isn't in the register cache doesn't mean that the register
657 isn't available (it could have been fetched from memory). */
659 extern int frame_register_read (struct frame_info *frame, int regnum,
663 extern void args_info (char *, int);
665 extern void locals_info (char *, int);
667 extern void (*deprecated_selected_frame_level_changed_hook) (int);
669 extern void return_command (char *, int);
671 /* Set FRAME's unwinder temporarily, so that we can call a sniffer.
672 Return a cleanup which should be called if unwinding fails, and
673 discarded if it succeeds. */
675 struct cleanup *frame_prepare_for_sniffer (struct frame_info *frame,
676 const struct frame_unwind *unwind);
678 /* Notes (cagney/2002-11-27, drow/2003-09-06):
680 You might think that calls to this function can simply be replaced by a
681 call to get_selected_frame().
683 Unfortunately, it isn't that easy.
685 The relevant code needs to be audited to determine if it is
686 possible (or practical) to instead pass the applicable frame in as a
687 parameter. For instance, DEPRECATED_DO_REGISTERS_INFO() relied on
688 the deprecated_selected_frame global, while its replacement,
689 PRINT_REGISTERS_INFO(), is parameterized with the selected frame.
690 The only real exceptions occur at the edge (in the CLI code) where
691 user commands need to pick up the selected frame before proceeding.
693 There are also some functions called with a NULL frame meaning either "the
694 program is not running" or "use the selected frame".
696 This is important. GDB is trying to stamp out the hack:
698 saved_frame = deprecated_safe_get_selected_frame ();
700 hack_using_global_selected_frame ();
701 select_frame (saved_frame);
705 This function calls get_selected_frame if the inferior should have a
706 frame, or returns NULL otherwise. */
708 extern struct frame_info *deprecated_safe_get_selected_frame (void);
710 /* Create a frame using the specified BASE and PC. */
712 extern struct frame_info *create_new_frame (CORE_ADDR base, CORE_ADDR pc);
714 /* Return true if the frame unwinder for frame FI is UNWINDER; false
717 extern int frame_unwinder_is (struct frame_info *fi,
718 const struct frame_unwind *unwinder);
720 #endif /* !defined (FRAME_H) */