1 /* Cache and manage frames for GDB, the GNU debugger.
3 Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
4 2001, 2002, 2003 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
27 #include "inferior.h" /* for inferior_ptid */
29 #include "gdb_assert.h"
30 #include "gdb_string.h"
31 #include "builtin-regs.h"
32 #include "gdb_obstack.h"
33 #include "dummy-frame.h"
34 #include "sentinel-frame.h"
38 #include "frame-unwind.h"
39 #include "frame-base.h"
43 /* Flag to control debugging. */
45 static int frame_debug
;
47 /* Flag to indicate whether backtraces should stop at main. */
49 static int backtrace_below_main
;
52 fprint_frame_id (struct ui_file
*file
, struct frame_id id
)
54 fprintf_unfiltered (file
, "{stack=0x%s,code=0x%s}",
55 paddr_nz (id
.stack_addr
),
56 paddr_nz (id
.code_addr
));
60 fprint_frame_type (struct ui_file
*file
, enum frame_type type
)
65 fprintf_unfiltered (file
, "UNKNOWN_FRAME");
68 fprintf_unfiltered (file
, "NORMAL_FRAME");
71 fprintf_unfiltered (file
, "DUMMY_FRAME");
74 fprintf_unfiltered (file
, "SIGTRAMP_FRAME");
77 fprintf_unfiltered (file
, "<unknown type>");
83 fprint_frame (struct ui_file
*file
, struct frame_info
*fi
)
87 fprintf_unfiltered (file
, "<NULL frame>");
90 fprintf_unfiltered (file
, "{");
91 fprintf_unfiltered (file
, "level=%d", fi
->level
);
92 fprintf_unfiltered (file
, ",");
93 fprintf_unfiltered (file
, "type=");
94 fprint_frame_type (file
, fi
->type
);
95 fprintf_unfiltered (file
, ",");
96 fprintf_unfiltered (file
, "unwind=");
97 if (fi
->unwind
!= NULL
)
98 gdb_print_host_address (fi
->unwind
, file
);
100 fprintf_unfiltered (file
, "<unknown>");
101 fprintf_unfiltered (file
, ",");
102 fprintf_unfiltered (file
, "pc=");
103 if (fi
->next
!= NULL
&& fi
->next
->prev_pc
.p
)
104 fprintf_unfiltered (file
, "0x%s", paddr_nz (fi
->next
->prev_pc
.value
));
106 fprintf_unfiltered (file
, "<unknown>");
107 fprintf_unfiltered (file
, ",");
108 fprintf_unfiltered (file
, "id=");
110 fprint_frame_id (file
, fi
->this_id
.value
);
112 fprintf_unfiltered (file
, "<unknown>");
113 fprintf_unfiltered (file
, ",");
114 fprintf_unfiltered (file
, "func=");
115 if (fi
->next
!= NULL
&& fi
->next
->prev_func
.p
)
116 fprintf_unfiltered (file
, "0x%s", paddr_nz (fi
->next
->prev_func
.addr
));
118 fprintf_unfiltered (file
, "<unknown>");
119 fprintf_unfiltered (file
, "}");
122 /* Return a frame uniq ID that can be used to, later, re-find the
126 get_frame_id (struct frame_info
*fi
)
130 return null_frame_id
;
134 gdb_assert (!legacy_frame_p (current_gdbarch
));
136 fprintf_unfiltered (gdb_stdlog
, "{ get_frame_id (fi=%d) ",
138 /* Find THIS frame's ID. */
139 fi
->unwind
->this_id (fi
->next
, &fi
->prologue_cache
, &fi
->this_id
.value
);
143 fprintf_unfiltered (gdb_stdlog
, "-> ");
144 fprint_frame_id (gdb_stdlog
, fi
->this_id
.value
);
145 fprintf_unfiltered (gdb_stdlog
, " }\n");
148 return frame_id_build (fi
->this_id
.value
.stack_addr
, get_frame_pc (fi
));
151 const struct frame_id null_frame_id
; /* All zeros. */
154 frame_id_build (CORE_ADDR stack_addr
, CORE_ADDR code_addr
)
157 id
.stack_addr
= stack_addr
;
158 id
.code_addr
= code_addr
;
163 frame_id_p (struct frame_id l
)
166 /* The .code can be NULL but the .stack cannot. */
167 p
= (l
.stack_addr
!= 0);
170 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_p (l=");
171 fprint_frame_id (gdb_stdlog
, l
);
172 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", p
);
178 frame_id_eq (struct frame_id l
, struct frame_id r
)
181 if (l
.stack_addr
== 0 || r
.stack_addr
== 0)
182 /* Like a NaN, if either ID is invalid, the result is false. */
184 else if (l
.stack_addr
!= r
.stack_addr
)
185 /* If .stack addresses are different, the frames are different. */
187 else if (l
.code_addr
== 0 || r
.code_addr
== 0)
188 /* A zero code addr is a wild card, always succeed. */
190 else if (l
.code_addr
== r
.code_addr
)
191 /* The .stack and .code are identical, the ID's are identical. */
194 /* FIXME: cagney/2003-04-06: This should be zero. Can't yet do
195 this because most frame ID's are not being initialized
200 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_eq (l=");
201 fprint_frame_id (gdb_stdlog
, l
);
202 fprintf_unfiltered (gdb_stdlog
, ",r=");
203 fprint_frame_id (gdb_stdlog
, r
);
204 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", eq
);
210 frame_id_inner (struct frame_id l
, struct frame_id r
)
213 if (l
.stack_addr
== 0 || r
.stack_addr
== 0)
214 /* Like NaN, any operation involving an invalid ID always fails. */
217 /* Only return non-zero when strictly inner than. Note that, per
218 comment in "frame.h", there is some fuzz here. Frameless
219 functions are not strictly inner than (same .stack but
221 inner
= INNER_THAN (l
.stack_addr
, r
.stack_addr
);
224 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_inner (l=");
225 fprint_frame_id (gdb_stdlog
, l
);
226 fprintf_unfiltered (gdb_stdlog
, ",r=");
227 fprint_frame_id (gdb_stdlog
, r
);
228 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", inner
);
234 frame_find_by_id (struct frame_id id
)
236 struct frame_info
*frame
;
238 /* ZERO denotes the null frame, let the caller decide what to do
239 about it. Should it instead return get_current_frame()? */
240 if (!frame_id_p (id
))
243 for (frame
= get_current_frame ();
245 frame
= get_prev_frame (frame
))
247 struct frame_id
this = get_frame_id (frame
);
248 if (frame_id_eq (id
, this))
249 /* An exact match. */
251 if (frame_id_inner (id
, this))
254 /* Either, we're not yet gone far enough out along the frame
255 chain (inner(this,id), or we're comparing frameless functions
256 (same .base, different .func, no test available). Struggle
257 on until we've definitly gone to far. */
263 frame_pc_unwind (struct frame_info
*this_frame
)
265 if (!this_frame
->prev_pc
.p
)
268 if (gdbarch_unwind_pc_p (current_gdbarch
))
270 /* The right way. The `pure' way. The one true way. This
271 method depends solely on the register-unwind code to
272 determine the value of registers in THIS frame, and hence
273 the value of this frame's PC (resume address). A typical
274 implementation is no more than:
276 frame_unwind_register (this_frame, ISA_PC_REGNUM, buf);
277 return extract_address (buf, size of ISA_PC_REGNUM);
279 Note: this method is very heavily dependent on a correct
280 register-unwind implementation, it pays to fix that
281 method first; this method is frame type agnostic, since
282 it only deals with register values, it works with any
283 frame. This is all in stark contrast to the old
284 FRAME_SAVED_PC which would try to directly handle all the
285 different ways that a PC could be unwound. */
286 pc
= gdbarch_unwind_pc (current_gdbarch
, this_frame
);
288 else if (this_frame
->level
< 0)
290 /* FIXME: cagney/2003-03-06: Old code and and a sentinel
291 frame. Do like was always done. Fetch the PC's value
292 direct from the global registers array (via read_pc).
293 This assumes that this frame belongs to the current
294 global register cache. The assumption is dangerous. */
297 else if (DEPRECATED_FRAME_SAVED_PC_P ())
299 /* FIXME: cagney/2003-03-06: Old code, but not a sentinel
300 frame. Do like was always done. Note that this method,
301 unlike unwind_pc(), tries to handle all the different
302 frame cases directly. It fails. */
303 pc
= DEPRECATED_FRAME_SAVED_PC (this_frame
);
306 internal_error (__FILE__
, __LINE__
, "No gdbarch_unwind_pc method");
307 this_frame
->prev_pc
.value
= pc
;
308 this_frame
->prev_pc
.p
= 1;
310 fprintf_unfiltered (gdb_stdlog
,
311 "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n",
313 paddr_nz (this_frame
->prev_pc
.value
));
315 return this_frame
->prev_pc
.value
;
319 frame_func_unwind (struct frame_info
*fi
)
321 if (!fi
->prev_func
.p
)
324 fi
->prev_func
.addr
= get_pc_function_start (frame_pc_unwind (fi
));
326 fprintf_unfiltered (gdb_stdlog
,
327 "{ frame_func_unwind (fi=%d) -> 0x%s }\n",
328 fi
->level
, paddr_nz (fi
->prev_func
.addr
));
330 return fi
->prev_func
.addr
;
334 get_frame_func (struct frame_info
*fi
)
336 return frame_func_unwind (fi
->next
);
340 do_frame_unwind_register (void *src
, int regnum
, void *buf
)
342 frame_unwind_register (src
, regnum
, buf
);
347 frame_pop (struct frame_info
*this_frame
)
349 struct regcache
*scratch_regcache
;
350 struct cleanup
*cleanups
;
352 if (DEPRECATED_POP_FRAME_P ())
354 /* A legacy architecture that has implemented a custom pop
355 function. All new architectures should instead be using the
356 generic code below. */
357 DEPRECATED_POP_FRAME
;
361 /* Make a copy of all the register values unwound from this
362 frame. Save them in a scratch buffer so that there isn't a
363 race betweening trying to extract the old values from the
364 current_regcache while, at the same time writing new values
365 into that same cache. */
366 struct regcache
*scratch
= regcache_xmalloc (current_gdbarch
);
367 struct cleanup
*cleanups
= make_cleanup_regcache_xfree (scratch
);
368 regcache_save (scratch
, do_frame_unwind_register
, this_frame
);
369 /* FIXME: cagney/2003-03-16: It should be possible to tell the
370 target's register cache that it is about to be hit with a
371 burst register transfer and that the sequence of register
372 writes should be batched. The pair target_prepare_to_store()
373 and target_store_registers() kind of suggest this
374 functionality. Unfortunatly, they don't implement it. Their
375 lack of a formal definition can lead to targets writing back
376 bogus values (arguably a bug in the target code mind). */
377 /* Now copy those saved registers into the current regcache.
378 Here, regcache_cpy() calls regcache_restore(). */
379 regcache_cpy (current_regcache
, scratch
);
380 do_cleanups (cleanups
);
382 /* We've made right mess of GDB's local state, just discard
384 flush_cached_frames ();
388 frame_register_unwind (struct frame_info
*frame
, int regnum
,
389 int *optimizedp
, enum lval_type
*lvalp
,
390 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
392 struct frame_unwind_cache
*cache
;
396 fprintf_unfiltered (gdb_stdlog
,
397 "{ frame_register_unwind (frame=%d,regnum=\"%s\",...) ",
398 frame
->level
, frame_map_regnum_to_name (regnum
));
401 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
402 that the value proper does not need to be fetched. */
403 gdb_assert (optimizedp
!= NULL
);
404 gdb_assert (lvalp
!= NULL
);
405 gdb_assert (addrp
!= NULL
);
406 gdb_assert (realnump
!= NULL
);
407 /* gdb_assert (bufferp != NULL); */
409 /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame
410 is broken. There is always a frame. If there, for some reason,
411 isn't, there is some pretty busted code as it should have
412 detected the problem before calling here. */
413 gdb_assert (frame
!= NULL
);
415 /* Ask this frame to unwind its register. See comment in
416 "frame-unwind.h" for why NEXT frame and this unwind cace are
418 frame
->unwind
->prev_register (frame
->next
, &frame
->prologue_cache
, regnum
,
419 optimizedp
, lvalp
, addrp
, realnump
, bufferp
);
423 fprintf_unfiltered (gdb_stdlog
, "->");
424 fprintf_unfiltered (gdb_stdlog
, " *optimizedp=%d", (*optimizedp
));
425 fprintf_unfiltered (gdb_stdlog
, " *lvalp=%d", (int) (*lvalp
));
426 fprintf_unfiltered (gdb_stdlog
, " *addrp=0x%s", paddr_nz ((*addrp
)));
427 fprintf_unfiltered (gdb_stdlog
, " *bufferp=");
429 fprintf_unfiltered (gdb_stdlog
, "<NULL>");
433 const char *buf
= bufferp
;
434 fprintf_unfiltered (gdb_stdlog
, "[");
435 for (i
= 0; i
< register_size (current_gdbarch
, regnum
); i
++)
436 fprintf_unfiltered (gdb_stdlog
, "%02x", buf
[i
]);
437 fprintf_unfiltered (gdb_stdlog
, "]");
439 fprintf_unfiltered (gdb_stdlog
, " }\n");
444 frame_register (struct frame_info
*frame
, int regnum
,
445 int *optimizedp
, enum lval_type
*lvalp
,
446 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
448 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
449 that the value proper does not need to be fetched. */
450 gdb_assert (optimizedp
!= NULL
);
451 gdb_assert (lvalp
!= NULL
);
452 gdb_assert (addrp
!= NULL
);
453 gdb_assert (realnump
!= NULL
);
454 /* gdb_assert (bufferp != NULL); */
456 /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
457 of the register in the register cache. It should instead return
458 the REGNUM corresponding to that register. Translate the . */
459 if (DEPRECATED_GET_SAVED_REGISTER_P ())
461 DEPRECATED_GET_SAVED_REGISTER (bufferp
, optimizedp
, addrp
, frame
,
463 /* Compute the REALNUM if the caller wants it. */
464 if (*lvalp
== lval_register
)
467 for (regnum
= 0; regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
; regnum
++)
469 if (*addrp
== register_offset_hack (current_gdbarch
, regnum
))
475 internal_error (__FILE__
, __LINE__
,
476 "Failed to compute the register number corresponding"
477 " to 0x%s", paddr_d (*addrp
));
483 /* Obtain the register value by unwinding the register from the next
484 (more inner frame). */
485 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
486 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
491 frame_unwind_register (struct frame_info
*frame
, int regnum
, void *buf
)
497 frame_register_unwind (frame
, regnum
, &optimized
, &lval
, &addr
,
502 frame_unwind_signed_register (struct frame_info
*frame
, int regnum
,
505 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
506 frame_unwind_register (frame
, regnum
, buf
);
507 (*val
) = extract_signed_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
511 frame_unwind_unsigned_register (struct frame_info
*frame
, int regnum
,
514 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
515 frame_unwind_register (frame
, regnum
, buf
);
516 (*val
) = extract_unsigned_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
520 frame_read_register (struct frame_info
*frame
, int regnum
, void *buf
)
522 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
523 frame_unwind_register (frame
->next
, regnum
, buf
);
527 frame_read_unsigned_register (struct frame_info
*frame
, int regnum
,
530 /* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is
531 always a frame. Both this, and the equivalent
532 frame_read_signed_register() function, can only be called with a
533 valid frame. If, for some reason, this function is called
534 without a frame then the problem isn't here, but rather in the
535 caller. It should of first created a frame and then passed that
537 /* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the
538 ``current_frame'' should not be treated as a special case. While
539 ``get_next_frame (current_frame) == NULL'' currently holds, it
540 should, as far as possible, not be relied upon. In the future,
541 ``get_next_frame (current_frame)'' may instead simply return a
542 normal frame object that simply always gets register values from
543 the register cache. Consequently, frame code should try to avoid
544 tests like ``if get_next_frame() == NULL'' and instead just rely
545 on recursive frame calls (like the below code) when manipulating
547 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
548 frame_unwind_unsigned_register (frame
->next
, regnum
, val
);
552 frame_read_signed_register (struct frame_info
*frame
, int regnum
,
555 /* See note above in frame_read_unsigned_register(). */
556 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
557 frame_unwind_signed_register (frame
->next
, regnum
, val
);
561 generic_unwind_get_saved_register (char *raw_buffer
,
564 struct frame_info
*frame
,
566 enum lval_type
*lvalp
)
571 enum lval_type lvalx
;
573 if (!target_has_registers
)
574 error ("No registers.");
576 /* Keep things simple, ensure that all the pointers (except valuep)
578 if (optimizedp
== NULL
)
579 optimizedp
= &optimizedx
;
585 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
586 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
587 &realnumx
, raw_buffer
);
590 /* frame_register_read ()
592 Find and return the value of REGNUM for the specified stack frame.
593 The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
595 Returns 0 if the register value could not be found. */
598 frame_register_read (struct frame_info
*frame
, int regnum
, void *myaddr
)
604 frame_register (frame
, regnum
, &optimized
, &lval
, &addr
, &realnum
, myaddr
);
606 /* FIXME: cagney/2002-05-15: This test, is just bogus.
608 It indicates that the target failed to supply a value for a
609 register because it was "not available" at this time. Problem
610 is, the target still has the register and so get saved_register()
611 may be returning a value saved on the stack. */
613 if (register_cached (regnum
) < 0)
614 return 0; /* register value not available */
620 /* Map between a frame register number and its name. A frame register
621 space is a superset of the cooked register space --- it also
622 includes builtin registers. */
625 frame_map_name_to_regnum (const char *name
, int len
)
632 /* Search register name space. */
633 for (i
= 0; i
< NUM_REGS
+ NUM_PSEUDO_REGS
; i
++)
634 if (REGISTER_NAME (i
) && len
== strlen (REGISTER_NAME (i
))
635 && strncmp (name
, REGISTER_NAME (i
), len
) == 0)
640 /* Try builtin registers. */
641 i
= builtin_reg_map_name_to_regnum (name
, len
);
644 /* A builtin register doesn't fall into the architecture's
646 gdb_assert (i
>= NUM_REGS
+ NUM_PSEUDO_REGS
);
654 frame_map_regnum_to_name (int regnum
)
658 if (regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
)
659 return REGISTER_NAME (regnum
);
660 return builtin_reg_map_regnum_to_name (regnum
);
663 /* Create a sentinel frame. */
666 create_sentinel_frame (struct regcache
*regcache
)
668 struct frame_info
*frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
669 frame
->type
= NORMAL_FRAME
;
671 /* Explicitly initialize the sentinel frame's cache. Provide it
672 with the underlying regcache. In the future additional
673 information, such as the frame's thread will be added. */
674 frame
->prologue_cache
= sentinel_frame_cache (regcache
);
675 /* For the moment there is only one sentinel frame implementation. */
676 frame
->unwind
= sentinel_frame_unwind
;
677 /* Link this frame back to itself. The frame is self referential
678 (the unwound PC is the same as the pc), so make it so. */
680 /* Make the sentinel frame's ID valid, but invalid. That way all
681 comparisons with it should fail. */
682 frame
->this_id
.p
= 1;
683 frame
->this_id
.value
= null_frame_id
;
686 fprintf_unfiltered (gdb_stdlog
, "{ create_sentinel_frame (...) -> ");
687 fprint_frame (gdb_stdlog
, frame
);
688 fprintf_unfiltered (gdb_stdlog
, " }\n");
693 /* Info about the innermost stack frame (contents of FP register) */
695 static struct frame_info
*current_frame
;
697 /* Cache for frame addresses already read by gdb. Valid only while
698 inferior is stopped. Control variables for the frame cache should
699 be local to this module. */
701 static struct obstack frame_cache_obstack
;
704 frame_obstack_zalloc (unsigned long size
)
706 void *data
= obstack_alloc (&frame_cache_obstack
, size
);
707 memset (data
, 0, size
);
712 frame_saved_regs_zalloc (struct frame_info
*fi
)
714 fi
->saved_regs
= (CORE_ADDR
*)
715 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
716 return fi
->saved_regs
;
720 get_frame_saved_regs (struct frame_info
*fi
)
722 return fi
->saved_regs
;
725 /* Return the innermost (currently executing) stack frame. This is
726 split into two functions. The function unwind_to_current_frame()
727 is wrapped in catch exceptions so that, even when the unwind of the
728 sentinel frame fails, the function still returns a stack frame. */
731 unwind_to_current_frame (struct ui_out
*ui_out
, void *args
)
733 struct frame_info
*frame
= get_prev_frame (args
);
734 /* A sentinel frame can fail to unwind, eg, because it's PC value
735 lands in somewhere like start. */
738 current_frame
= frame
;
743 get_current_frame (void)
745 /* First check, and report, the lack of registers. Having GDB
746 report "No stack!" or "No memory" when the target doesn't even
747 have registers is very confusing. Besides, "printcmd.exp"
748 explicitly checks that ``print $pc'' with no registers prints "No
750 if (!target_has_registers
)
751 error ("No registers.");
752 if (!target_has_stack
)
754 if (!target_has_memory
)
755 error ("No memory.");
756 if (current_frame
== NULL
)
758 struct frame_info
*sentinel_frame
=
759 create_sentinel_frame (current_regcache
);
760 if (catch_exceptions (uiout
, unwind_to_current_frame
, sentinel_frame
,
761 NULL
, RETURN_MASK_ERROR
) != 0)
763 /* Oops! Fake a current frame? Is this useful? It has a PC
764 of zero, for instance. */
765 current_frame
= sentinel_frame
;
768 return current_frame
;
771 /* The "selected" stack frame is used by default for local and arg
772 access. May be zero, for no selected frame. */
774 struct frame_info
*deprecated_selected_frame
;
776 /* Return the selected frame. Always non-null (unless there isn't an
777 inferior sufficient for creating a frame) in which case an error is
781 get_selected_frame (void)
783 if (deprecated_selected_frame
== NULL
)
784 /* Hey! Don't trust this. It should really be re-finding the
785 last selected frame of the currently selected thread. This,
786 though, is better than nothing. */
787 select_frame (get_current_frame ());
788 /* There is always a frame. */
789 gdb_assert (deprecated_selected_frame
!= NULL
);
790 return deprecated_selected_frame
;
793 /* Select frame FI (or NULL - to invalidate the current frame). */
796 select_frame (struct frame_info
*fi
)
798 register struct symtab
*s
;
800 deprecated_selected_frame
= fi
;
801 /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
802 frame is being invalidated. */
803 if (selected_frame_level_changed_hook
)
804 selected_frame_level_changed_hook (frame_relative_level (fi
));
806 /* FIXME: kseitz/2002-08-28: It would be nice to call
807 selected_frame_level_changed_event right here, but due to limitations
808 in the current interfaces, we would end up flooding UIs with events
809 because select_frame is used extensively internally.
811 Once we have frame-parameterized frame (and frame-related) commands,
812 the event notification can be moved here, since this function will only
813 be called when the users selected frame is being changed. */
815 /* Ensure that symbols for this frame are read in. Also, determine the
816 source language of this frame, and switch to it if desired. */
819 s
= find_pc_symtab (get_frame_pc (fi
));
821 && s
->language
!= current_language
->la_language
822 && s
->language
!= language_unknown
823 && language_mode
== language_mode_auto
)
825 set_language (s
->language
);
830 /* Return the register saved in the simplistic ``saved_regs'' cache.
831 If the value isn't here AND a value is needed, try the next inner
835 legacy_saved_regs_prev_register (struct frame_info
*next_frame
,
836 void **this_prologue_cache
,
837 int regnum
, int *optimizedp
,
838 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
839 int *realnump
, void *bufferp
)
841 /* HACK: New code is passed the next frame and this cache.
842 Unfortunatly, old code expects this frame. Since this is a
843 backward compatibility hack, cheat by walking one level along the
844 prologue chain to the frame the old code expects.
846 Do not try this at home. Professional driver, closed course. */
847 struct frame_info
*frame
= next_frame
->prev
;
848 gdb_assert (frame
!= NULL
);
850 /* Only (older) architectures that implement the
851 DEPRECATED_FRAME_INIT_SAVED_REGS method should be using this
853 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
855 /* Load the saved_regs register cache. */
856 if (get_frame_saved_regs (frame
) == NULL
)
857 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
859 if (get_frame_saved_regs (frame
) != NULL
860 && get_frame_saved_regs (frame
)[regnum
] != 0)
862 if (regnum
== SP_REGNUM
)
864 /* SP register treated specially. */
870 store_address (bufferp
, REGISTER_RAW_SIZE (regnum
),
871 get_frame_saved_regs (frame
)[regnum
]);
875 /* Any other register is saved in memory, fetch it but cache
876 a local copy of its value. */
878 *lvalp
= lval_memory
;
879 *addrp
= get_frame_saved_regs (frame
)[regnum
];
884 /* Save each register value, as it is read in, in a
885 frame based cache. */
886 void **regs
= (*this_prologue_cache
);
889 int sizeof_cache
= ((NUM_REGS
+ NUM_PSEUDO_REGS
)
891 regs
= frame_obstack_zalloc (sizeof_cache
);
892 (*this_prologue_cache
) = regs
;
894 if (regs
[regnum
] == NULL
)
897 = frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum
));
898 read_memory (get_frame_saved_regs (frame
)[regnum
], regs
[regnum
],
899 REGISTER_RAW_SIZE (regnum
));
901 memcpy (bufferp
, regs
[regnum
], REGISTER_RAW_SIZE (regnum
));
903 /* Read the value in from memory. */
904 read_memory (get_frame_saved_regs (frame
)[regnum
], bufferp
,
905 REGISTER_RAW_SIZE (regnum
));
912 /* No luck. Assume this and the next frame have the same register
913 value. Pass the unwind request down the frame chain to the next
914 frame. Hopefully that frame will find the register's location. */
915 frame_register_unwind (next_frame
, regnum
, optimizedp
, lvalp
, addrp
,
920 legacy_saved_regs_this_id (struct frame_info
*next_frame
,
921 void **this_prologue_cache
,
928 if (frame_relative_level (next_frame
) < 0)
930 /* FIXME: cagney/2003-03-14: We've got the extra special case of
931 unwinding a sentinel frame, the PC of which is pointing at a
932 stack dummy. Fake up the dummy frame's ID using the same
933 sequence as is found a traditional unwinder. */
934 (*id
) = frame_id_build (read_fp (), read_pc ());
938 /* Start out by assuming it's NULL. */
939 (*id
) = null_frame_id
;
941 if (frame_relative_level (next_frame
) <= 0)
942 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
943 the frame chain, not just the inner most frame! The generic,
944 per-architecture, frame code should handle this and the below
945 should simply be removed. */
946 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (next_frame
);
951 /* A frameless inner-most frame. The `FP' (which isn't an
952 architecture frame-pointer register!) of the caller is the same
954 /* FIXME: 2002-11-09: There isn't any reason to special case this
955 edge condition. Instead the per-architecture code should hande
957 base
= get_frame_base (next_frame
);
960 /* Two macros defined in tm.h specify the machine-dependent
961 actions to be performed here.
963 First, get the frame's chain-pointer.
965 If that is zero, the frame is the outermost frame or a leaf
966 called by the outermost frame. This means that if start
967 calls main without a frame, we'll return 0 (which is fine
970 Nope; there's a problem. This also returns when the current
971 routine is a leaf of main. This is unacceptable. We move
972 this to after the ffi test; I'd rather have backtraces from
973 start go curfluy than have an abort called from main not show
975 gdb_assert (DEPRECATED_FRAME_CHAIN_P ());
976 base
= DEPRECATED_FRAME_CHAIN (next_frame
);
978 if (!legacy_frame_chain_valid (base
, next_frame
))
984 /* FIXME: cagney/2002-06-08: This should probably return the frame's
985 function and not the PC (a.k.a. resume address). */
986 pc
= frame_pc_unwind (next_frame
);
987 (*id
) = frame_id_build (base
, pc
);
990 const struct frame_unwind legacy_saved_regs_unwinder
= {
991 /* Not really. It gets overridden by legacy_get_prev_frame. */
993 legacy_saved_regs_this_id
,
994 legacy_saved_regs_prev_register
996 const struct frame_unwind
*legacy_saved_regs_unwind
= &legacy_saved_regs_unwinder
;
999 /* Function: deprecated_generic_get_saved_register
1000 Find register number REGNUM relative to FRAME and put its (raw,
1001 target format) contents in *RAW_BUFFER.
1003 Set *OPTIMIZED if the variable was optimized out (and thus can't be
1004 fetched). Note that this is never set to anything other than zero
1005 in this implementation.
1007 Set *LVAL to lval_memory, lval_register, or not_lval, depending on
1008 whether the value was fetched from memory, from a register, or in a
1009 strange and non-modifiable way (e.g. a frame pointer which was
1010 calculated rather than fetched). We will use not_lval for values
1011 fetched from generic dummy frames.
1013 Set *ADDRP to the address, either in memory or as a REGISTER_BYTE
1014 offset into the registers array. If the value is stored in a dummy
1015 frame, set *ADDRP to zero.
1017 The argument RAW_BUFFER must point to aligned memory. */
1020 deprecated_generic_get_saved_register (char *raw_buffer
, int *optimized
,
1022 struct frame_info
*frame
, int regnum
,
1023 enum lval_type
*lval
)
1025 if (!target_has_registers
)
1026 error ("No registers.");
1028 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
1030 /* Normal systems don't optimize out things with register numbers. */
1031 if (optimized
!= NULL
)
1034 if (addrp
) /* default assumption: not found in memory */
1037 /* Note: since the current frame's registers could only have been
1038 saved by frames INTERIOR TO the current frame, we skip examining
1039 the current frame itself: otherwise, we would be getting the
1040 previous frame's registers which were saved by the current frame. */
1044 for (frame
= get_next_frame (frame
);
1045 frame_relative_level (frame
) >= 0;
1046 frame
= get_next_frame (frame
))
1048 if (get_frame_type (frame
) == DUMMY_FRAME
)
1050 if (lval
) /* found it in a CALL_DUMMY frame */
1053 /* FIXME: cagney/2002-06-26: This should be via the
1054 gdbarch_register_read() method so that it, on the
1055 fly, constructs either a raw or pseudo register
1056 from the raw register cache. */
1058 (generic_find_dummy_frame (get_frame_pc (frame
),
1059 get_frame_base (frame
)),
1060 regnum
, raw_buffer
);
1064 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
1065 if (get_frame_saved_regs (frame
) != NULL
1066 && get_frame_saved_regs (frame
)[regnum
] != 0)
1068 if (lval
) /* found it saved on the stack */
1069 *lval
= lval_memory
;
1070 if (regnum
== SP_REGNUM
)
1072 if (raw_buffer
) /* SP register treated specially */
1073 store_address (raw_buffer
, REGISTER_RAW_SIZE (regnum
),
1074 get_frame_saved_regs (frame
)[regnum
]);
1078 if (addrp
) /* any other register */
1079 *addrp
= get_frame_saved_regs (frame
)[regnum
];
1081 read_memory (get_frame_saved_regs (frame
)[regnum
], raw_buffer
,
1082 REGISTER_RAW_SIZE (regnum
));
1089 /* If we get thru the loop to this point, it means the register was
1090 not saved in any frame. Return the actual live-register value. */
1092 if (lval
) /* found it in a live register */
1093 *lval
= lval_register
;
1095 *addrp
= REGISTER_BYTE (regnum
);
1097 deprecated_read_register_gen (regnum
, raw_buffer
);
1100 /* Determine the frame's type based on its PC. */
1102 static enum frame_type
1103 frame_type_from_pc (CORE_ADDR pc
)
1105 /* FIXME: cagney/2002-11-24: Can't yet directly call
1106 pc_in_dummy_frame() as some architectures don't set
1107 PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
1108 latter is implemented by simply calling pc_in_dummy_frame). */
1109 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1110 && DEPRECATED_PC_IN_CALL_DUMMY (pc
, 0, 0))
1115 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
1116 if (PC_IN_SIGTRAMP (pc
, name
))
1117 return SIGTRAMP_FRAME
;
1119 return NORMAL_FRAME
;
1123 /* Create an arbitrary (i.e. address specified by user) or innermost frame.
1124 Always returns a non-NULL value. */
1127 create_new_frame (CORE_ADDR addr
, CORE_ADDR pc
)
1129 struct frame_info
*fi
;
1133 fprintf_unfiltered (gdb_stdlog
,
1134 "{ create_new_frame (addr=0x%s, pc=0x%s) ",
1135 paddr_nz (addr
), paddr_nz (pc
));
1138 fi
= frame_obstack_zalloc (sizeof (struct frame_info
));
1140 fi
->next
= create_sentinel_frame (current_regcache
);
1142 /* Select/initialize both the unwind function and the frame's type
1144 fi
->unwind
= frame_unwind_find_by_pc (current_gdbarch
, pc
);
1145 if (fi
->unwind
->type
!= UNKNOWN_FRAME
)
1146 fi
->type
= fi
->unwind
->type
;
1148 fi
->type
= frame_type_from_pc (pc
);
1150 deprecated_update_frame_base_hack (fi
, addr
);
1151 deprecated_update_frame_pc_hack (fi
, pc
);
1153 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1154 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi
);
1158 fprintf_unfiltered (gdb_stdlog
, "-> ");
1159 fprint_frame (gdb_stdlog
, fi
);
1160 fprintf_unfiltered (gdb_stdlog
, " }\n");
1166 /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the
1167 innermost frame). Be careful to not fall off the bottom of the
1168 frame chain and onto the sentinel frame. */
1171 get_next_frame (struct frame_info
*this_frame
)
1173 if (this_frame
->level
> 0)
1174 return this_frame
->next
;
1179 /* Flush the entire frame cache. */
1182 flush_cached_frames (void)
1184 /* Since we can't really be sure what the first object allocated was */
1185 obstack_free (&frame_cache_obstack
, 0);
1186 obstack_init (&frame_cache_obstack
);
1188 current_frame
= NULL
; /* Invalidate cache */
1189 select_frame (NULL
);
1190 annotate_frames_invalid ();
1192 fprintf_unfiltered (gdb_stdlog
, "{ flush_cached_frames () }\n");
1195 /* Flush the frame cache, and start a new one if necessary. */
1198 reinit_frame_cache (void)
1200 flush_cached_frames ();
1202 /* FIXME: The inferior_ptid test is wrong if there is a corefile. */
1203 if (PIDGET (inferior_ptid
) != 0)
1205 select_frame (get_current_frame ());
1209 /* Create the previous frame using the deprecated methods
1210 INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
1212 static struct frame_info
*
1213 legacy_get_prev_frame (struct frame_info
*this_frame
)
1215 CORE_ADDR address
= 0;
1216 struct frame_info
*prev
;
1219 /* Don't frame_debug print legacy_get_prev_frame() here, just
1220 confuses the output. */
1222 /* Allocate the new frame.
1224 There is no reason to worry about memory leaks, should the
1225 remainder of the function fail. The allocated memory will be
1226 quickly reclaimed when the frame cache is flushed, and the `we've
1227 been here before' check, in get_prev_frame will stop repeated
1228 memory allocation calls. */
1229 prev
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1230 prev
->level
= this_frame
->level
+ 1;
1232 /* Do not completly wire it in to the frame chain. Some (bad) code
1233 in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull
1234 some fancy tricks (of course such code is, by definition,
1237 On the other hand, methods, such as get_frame_pc() and
1238 get_frame_base() rely on being able to walk along the frame
1239 chain. Make certain that at least they work by providing that
1240 link. Of course things manipulating prev can't go back. */
1241 prev
->next
= this_frame
;
1243 /* NOTE: cagney/2002-11-18: Should have been correctly setting the
1244 frame's type here, before anything else, and not last, at the
1245 bottom of this function. The various
1246 DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC,
1247 DEPRECATED_INIT_FRAME_PC_FIRST and
1248 DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds
1249 that handle the frame not being correctly set from the start.
1250 Unfortunatly those same work-arounds rely on the type defaulting
1251 to NORMAL_FRAME. Ulgh! The new frame code does not have this
1253 prev
->type
= UNKNOWN_FRAME
;
1255 /* A legacy frame's ID is always computed here. Mark it as valid. */
1256 prev
->this_id
.p
= 1;
1258 /* Handle sentinel frame unwind as a special case. */
1259 if (this_frame
->level
< 0)
1261 /* Try to unwind the PC. If that doesn't work, assume we've reached
1262 the oldest frame and simply return. Is there a better sentinal
1263 value? The unwound PC value is then used to initialize the new
1264 previous frame's type.
1266 Note that the pc-unwind is intentionally performed before the
1267 frame chain. This is ok since, for old targets, both
1268 frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and
1269 DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
1270 have already been initialized (using
1271 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1274 By unwinding the PC first, it becomes possible to, in the case of
1275 a dummy frame, avoid also unwinding the frame ID. This is
1276 because (well ignoring the PPC) a dummy frame can be located
1277 using THIS_FRAME's frame ID. */
1279 deprecated_update_frame_pc_hack (prev
, frame_pc_unwind (this_frame
));
1280 if (get_frame_pc (prev
) == 0)
1282 /* The allocated PREV_FRAME will be reclaimed when the frame
1283 obstack is next purged. */
1286 fprintf_unfiltered (gdb_stdlog
, "-> ");
1287 fprint_frame (gdb_stdlog
, NULL
);
1288 fprintf_unfiltered (gdb_stdlog
,
1289 " // unwound legacy PC zero }\n");
1294 /* Set the unwind functions based on that identified PC. Ditto
1295 for the "type" but strongly prefer the unwinder's frame type. */
1296 prev
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
1297 get_frame_pc (prev
));
1298 if (prev
->unwind
->type
== UNKNOWN_FRAME
)
1299 prev
->type
= frame_type_from_pc (get_frame_pc (prev
));
1301 prev
->type
= prev
->unwind
->type
;
1303 /* Find the prev's frame's ID. */
1304 if (prev
->type
== DUMMY_FRAME
1305 && gdbarch_unwind_dummy_id_p (current_gdbarch
))
1307 /* When unwinding a normal frame, the stack structure is
1308 determined by analyzing the frame's function's code (be
1309 it using brute force prologue analysis, or the dwarf2
1310 CFI). In the case of a dummy frame, that simply isn't
1311 possible. The The PC is either the program entry point,
1312 or some random address on the stack. Trying to use that
1313 PC to apply standard frame ID unwind techniques is just
1314 asking for trouble. */
1315 /* Assume call_function_by_hand(), via SAVE_DUMMY_FRAME_TOS,
1316 previously saved the dummy frame's ID. Things only work
1317 if the two return the same value. */
1318 gdb_assert (SAVE_DUMMY_FRAME_TOS_P ());
1319 /* Use an architecture specific method to extract the prev's
1320 dummy ID from the next frame. Note that this method uses
1321 frame_register_unwind to obtain the register values
1322 needed to determine the dummy frame's ID. */
1323 prev
->this_id
.value
= gdbarch_unwind_dummy_id (current_gdbarch
,
1328 /* We're unwinding a sentinel frame, the PC of which is
1329 pointing at a stack dummy. Fake up the dummy frame's ID
1330 using the same sequence as is found a traditional
1331 unwinder. Once all architectures supply the
1332 unwind_dummy_id method, this code can go away. */
1333 prev
->this_id
.value
= frame_id_build (read_fp (), read_pc ());
1336 /* Check that the unwound ID is valid. */
1337 if (!frame_id_p (prev
->this_id
.value
))
1341 fprintf_unfiltered (gdb_stdlog
, "-> ");
1342 fprint_frame (gdb_stdlog
, NULL
);
1343 fprintf_unfiltered (gdb_stdlog
,
1344 " // unwound legacy ID invalid }\n");
1349 /* Check that the new frame isn't inner to (younger, below,
1350 next) the old frame. If that happens the frame unwind is
1352 /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
1353 that doesn't have a valid frame ID. Should instead set the
1354 sentinel frame's frame ID to a `sentinel'. Leave it until
1355 after the switch to storing the frame ID, instead of the
1356 frame base, in the frame object. */
1359 this_frame
->prev
= prev
;
1361 /* FIXME: cagney/2002-01-19: This call will go away. Instead of
1362 initializing extra info, all frames will use the frame_cache
1363 (passed to the unwind functions) to store additional frame
1364 info. Unfortunatly legacy targets can't use
1365 legacy_get_prev_frame() to unwind the sentinel frame and,
1366 consequently, are forced to take this code path and rely on
1367 the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to
1368 initialize the inner-most frame. */
1369 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1371 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev
);
1375 fprintf_unfiltered (gdb_stdlog
, "-> ");
1376 fprint_frame (gdb_stdlog
, prev
);
1377 fprintf_unfiltered (gdb_stdlog
, " } // legacy innermost frame\n");
1382 /* This code only works on normal frames. A sentinel frame, where
1383 the level is -1, should never reach this code. */
1384 gdb_assert (this_frame
->level
>= 0);
1386 /* On some machines it is possible to call a function without
1387 setting up a stack frame for it. On these machines, we
1388 define this macro to take two args; a frameinfo pointer
1389 identifying a frame and a variable to set or clear if it is
1390 or isn't leafless. */
1392 /* Still don't want to worry about this except on the innermost
1393 frame. This macro will set FROMLEAF if THIS_FRAME is a frameless
1394 function invocation. */
1395 if (this_frame
->level
== 0)
1396 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
1397 the frame chain, not just the inner most frame! The generic,
1398 per-architecture, frame code should handle this and the below
1399 should simply be removed. */
1400 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (this_frame
);
1405 /* A frameless inner-most frame. The `FP' (which isn't an
1406 architecture frame-pointer register!) of the caller is the same
1408 /* FIXME: 2002-11-09: There isn't any reason to special case this
1409 edge condition. Instead the per-architecture code should hande
1411 address
= get_frame_base (this_frame
);
1414 /* Two macros defined in tm.h specify the machine-dependent
1415 actions to be performed here.
1417 First, get the frame's chain-pointer.
1419 If that is zero, the frame is the outermost frame or a leaf
1420 called by the outermost frame. This means that if start
1421 calls main without a frame, we'll return 0 (which is fine
1424 Nope; there's a problem. This also returns when the current
1425 routine is a leaf of main. This is unacceptable. We move
1426 this to after the ffi test; I'd rather have backtraces from
1427 start go curfluy than have an abort called from main not show
1429 gdb_assert (DEPRECATED_FRAME_CHAIN_P ());
1430 address
= DEPRECATED_FRAME_CHAIN (this_frame
);
1432 if (!legacy_frame_chain_valid (address
, this_frame
))
1436 fprintf_unfiltered (gdb_stdlog
, "-> ");
1437 fprint_frame (gdb_stdlog
, NULL
);
1438 fprintf_unfiltered (gdb_stdlog
,
1439 " // legacy frame chain invalid }\n");
1448 fprintf_unfiltered (gdb_stdlog
, "-> ");
1449 fprint_frame (gdb_stdlog
, NULL
);
1450 fprintf_unfiltered (gdb_stdlog
,
1451 " // legacy frame chain NULL }\n");
1456 /* Link in the already allocated prev frame. */
1457 this_frame
->prev
= prev
;
1458 deprecated_update_frame_base_hack (prev
, address
);
1460 /* This change should not be needed, FIXME! We should determine
1461 whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
1462 after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
1463 way to express what goes on here.
1465 DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
1466 create_new_frame (where the PC is already set up) and here (where
1467 it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
1468 always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
1470 The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
1471 requires the PC value (which hasn't been set yet). Some other
1472 machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
1473 before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
1475 We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
1476 complication to an already overcomplicated part of GDB.
1477 gnu@cygnus.com, 15Sep92.
1479 Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
1480 DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
1482 SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
1483 (read_fp ()), read_pc ()). Machines with extra frame info would
1484 do that (or the local equivalent) and then set the extra fields.
1486 SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
1487 create_new_frame would no longer init extra frame info;
1488 SETUP_ARBITRARY_FRAME would have to do that.
1490 INIT_PREV_FRAME(fromleaf, prev) Replace
1491 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
1492 This should also return a flag saying whether to keep the new
1493 frame, or whether to discard it, because on some machines (e.g.
1494 mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID
1495 called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good
1496 way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID
1497 into the extra fields of the new frame). std_frame_pc(fromleaf,
1500 This is the default setting for INIT_PREV_FRAME. It just does
1501 what the default DEPRECATED_INIT_FRAME_PC does. Some machines
1502 will call it from INIT_PREV_FRAME (either at the beginning, the
1503 end, or in the middle). Some machines won't use it.
1505 kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
1507 /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
1508 reason for things to be this complicated.
1510 The trick is to assume that there is always a frame. Instead of
1511 special casing the inner-most frame, create fake frame
1512 (containing the hardware registers) that is inner to the
1513 user-visible inner-most frame (...) and then unwind from that.
1514 That way architecture code can use use the standard
1515 frame_XX_unwind() functions and not differentiate between the
1516 inner most and any other case.
1518 Since there is always a frame to unwind from, there is always
1519 somewhere (THIS_FRAME) to store all the info needed to construct
1520 a new (previous) frame without having to first create it. This
1521 means that the convolution below - needing to carefully order a
1522 frame's initialization - isn't needed.
1524 The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least
1525 for a more up-to-date architecture, always calls
1526 FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but
1527 without first needing the frame! Instead of the convolution
1528 below, we could have simply called FRAME_SAVED_PC() and been done
1529 with it! Note that FRAME_SAVED_PC() is being superseed by
1530 frame_pc_unwind() and that function does have somewhere to cache
1533 if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
1534 deprecated_update_frame_pc_hack (prev
,
1535 DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf
,
1538 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1539 DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf
, prev
);
1541 /* This entry is in the frame queue now, which is good since
1542 FRAME_SAVED_PC may use that queue to figure out its value (see
1543 tm-sparc.h). We want the pc saved in the inferior frame. */
1544 if (DEPRECATED_INIT_FRAME_PC_P ())
1545 deprecated_update_frame_pc_hack (prev
,
1546 DEPRECATED_INIT_FRAME_PC (fromleaf
,
1549 /* If ->frame and ->pc are unchanged, we are in the process of
1550 getting ourselves into an infinite backtrace. Some architectures
1551 check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems
1552 like there is no reason this can't be an architecture-independent
1554 if (get_frame_base (prev
) == get_frame_base (this_frame
)
1555 && get_frame_pc (prev
) == get_frame_pc (this_frame
))
1557 this_frame
->prev
= NULL
;
1558 obstack_free (&frame_cache_obstack
, prev
);
1561 fprintf_unfiltered (gdb_stdlog
, "-> ");
1562 fprint_frame (gdb_stdlog
, NULL
);
1563 fprintf_unfiltered (gdb_stdlog
,
1564 " // legacy this.id == prev.id }\n");
1569 /* Initialize the code used to unwind the frame PREV based on the PC
1570 (and probably other architectural information). The PC lets you
1571 check things like the debug info at that point (dwarf2cfi?) and
1572 use that to decide how the frame should be unwound. */
1573 prev
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
1574 get_frame_pc (prev
));
1576 /* If the unwinder provides a frame type, use it. Otherwize
1577 continue on to that heuristic mess. */
1578 if (prev
->unwind
->type
!= UNKNOWN_FRAME
)
1580 prev
->type
= prev
->unwind
->type
;
1583 fprintf_unfiltered (gdb_stdlog
, "-> ");
1584 fprint_frame (gdb_stdlog
, prev
);
1585 fprintf_unfiltered (gdb_stdlog
, " } // legacy with unwound type\n");
1590 /* NOTE: cagney/2002-11-18: The code segments, found in
1591 create_new_frame and get_prev_frame(), that initializes the
1592 frames type is subtly different. The latter only updates ->type
1593 when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
1594 get_prev_frame() overriding the frame's type when the INIT code
1595 has previously set it. This is really somewhat bogus. The
1596 initialization, as seen in create_new_frame(), should occur
1597 before the INIT function has been called. */
1598 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1599 && (DEPRECATED_PC_IN_CALL_DUMMY_P ()
1600 ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev
), 0, 0)
1601 : pc_in_dummy_frame (get_frame_pc (prev
))))
1602 prev
->type
= DUMMY_FRAME
;
1605 /* FIXME: cagney/2002-11-10: This should be moved to before the
1606 INIT code above so that the INIT code knows what the frame's
1607 type is (in fact, for a [generic] dummy-frame, the type can
1608 be set and then the entire initialization can be skipped.
1609 Unforunatly, its the INIT code that sets the PC (Hmm, catch
1612 find_pc_partial_function (get_frame_pc (prev
), &name
, NULL
, NULL
);
1613 if (PC_IN_SIGTRAMP (get_frame_pc (prev
), name
))
1614 prev
->type
= SIGTRAMP_FRAME
;
1615 /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
1616 architectures are forcing the frame's type in INIT so we
1617 don't want to override it here. Remember, NORMAL_FRAME == 0,
1618 so it all works (just :-/). Once this initialization is
1619 moved to the start of this function, all this nastness will
1625 fprintf_unfiltered (gdb_stdlog
, "-> ");
1626 fprint_frame (gdb_stdlog
, prev
);
1627 fprintf_unfiltered (gdb_stdlog
, " } // legacy with confused type\n");
1633 /* Return a structure containing various interesting information
1634 about the frame that called THIS_FRAME. Returns NULL
1635 if there is no such frame. */
1638 get_prev_frame (struct frame_info
*this_frame
)
1640 struct frame_info
*prev_frame
;
1644 fprintf_unfiltered (gdb_stdlog
, "{ get_prev_frame (this_frame=");
1645 if (this_frame
!= NULL
)
1646 fprintf_unfiltered (gdb_stdlog
, "%d", this_frame
->level
);
1648 fprintf_unfiltered (gdb_stdlog
, "<NULL>");
1649 fprintf_unfiltered (gdb_stdlog
, ") ");
1652 /* Return the inner-most frame, when the caller passes in NULL. */
1653 /* NOTE: cagney/2002-11-09: Not sure how this would happen. The
1654 caller should have previously obtained a valid frame using
1655 get_selected_frame() and then called this code - only possibility
1656 I can think of is code behaving badly.
1658 NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
1659 block_innermost_frame(). It does the sequence: frame = NULL;
1660 while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
1661 it couldn't be written better, I don't know.
1663 NOTE: cagney/2003-01-11: I suspect what is happening is
1664 block_innermost_frame() is, when the target has no state
1665 (registers, memory, ...), still calling this function. The
1666 assumption being that this function will return NULL indicating
1667 that a frame isn't possible, rather than checking that the target
1668 has state and then calling get_current_frame() and
1669 get_prev_frame(). This is a guess mind. */
1670 if (this_frame
== NULL
)
1672 /* NOTE: cagney/2002-11-09: There was a code segment here that
1673 would error out when CURRENT_FRAME was NULL. The comment
1674 that went with it made the claim ...
1676 ``This screws value_of_variable, which just wants a nice
1677 clean NULL return from block_innermost_frame if there are no
1678 frames. I don't think I've ever seen this message happen
1679 otherwise. And returning NULL here is a perfectly legitimate
1682 Per the above, this code shouldn't even be called with a NULL
1684 return current_frame
;
1687 /* There is always a frame. If this assertion fails, suspect that
1688 something should be calling get_selected_frame() or
1689 get_current_frame(). */
1690 gdb_assert (this_frame
!= NULL
);
1692 if (this_frame
->level
>= 0
1693 && !backtrace_below_main
1694 && inside_main_func (get_frame_pc (this_frame
)))
1695 /* Don't unwind past main(), bug always unwind the sentinel frame.
1696 Note, this is done _before_ the frame has been marked as
1697 previously unwound. That way if the user later decides to
1698 allow unwinds past main(), that just happens. */
1701 fprintf_unfiltered (gdb_stdlog
, "-> NULL // inside main func }\n");
1705 /* Only try to do the unwind once. */
1706 if (this_frame
->prev_p
)
1710 fprintf_unfiltered (gdb_stdlog
, "-> ");
1711 fprint_frame (gdb_stdlog
, this_frame
->prev
);
1712 fprintf_unfiltered (gdb_stdlog
, " // cached \n");
1714 return this_frame
->prev
;
1716 this_frame
->prev_p
= 1;
1719 /* If we're inside the entry file, it isn't valid. Don't apply this
1720 test to a dummy frame - dummy frame PC's typically land in the
1721 entry file. Don't apply this test to the sentinel frame.
1722 Sentinel frames should always be allowed to unwind. */
1723 /* NOTE: drow/2002-12-25: should there be a way to disable this
1724 check? It assumes a single small entry file, and the way some
1725 debug readers (e.g. dbxread) figure out which object is the
1726 entry file is somewhat hokey. */
1727 /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
1728 then it should probably be moved to before the ->prev_p test,
1730 /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call to
1731 inside_entry_file destroys a meaningful backtrace under some
1732 conditions. E. g. the backtrace tests in the asm-source testcase
1733 are broken for some targets. In this test the functions are all
1734 implemented as part of one file and the testcase is not necessarily
1735 linked with a start file (depending on the target). What happens is,
1736 that the first frame is printed normaly and following frames are
1737 treated as being inside the enttry file then. This way, only the
1738 #0 frame is printed in the backtrace output. */
1739 if (this_frame
->type
!= DUMMY_FRAME
&& this_frame
->level
>= 0
1740 && inside_entry_file (get_frame_pc (this_frame
)))
1744 fprintf_unfiltered (gdb_stdlog
, "-> ");
1745 fprint_frame (gdb_stdlog
, NULL
);
1746 fprintf_unfiltered (gdb_stdlog
, " // inside entry file }\n");
1752 /* If we're already inside the entry function for the main objfile,
1753 then it isn't valid. Don't apply this test to a dummy frame -
1754 dummy frame PC's typically land in the entry func. Don't apply
1755 this test to the sentinel frame. Sentinel frames should always
1756 be allowed to unwind. */
1757 /* NOTE: cagney/2003-02-25: Don't enable until someone has found
1758 hard evidence that this is needed. */
1760 && this_frame
->type
!= DUMMY_FRAME
&& this_frame
->level
>= 0
1761 && inside_entry_func (get_frame_pc (this_frame
)))
1765 fprintf_unfiltered (gdb_stdlog
, "-> ");
1766 fprint_frame (gdb_stdlog
, NULL
);
1767 fprintf_unfiltered (gdb_stdlog
, "// inside entry func }\n");
1772 /* If any of the old frame initialization methods are around, use
1773 the legacy get_prev_frame method. */
1774 if (legacy_frame_p (current_gdbarch
))
1776 prev_frame
= legacy_get_prev_frame (this_frame
);
1780 /* Check that this frame's ID was valid. If it wasn't, don't try to
1781 unwind to the prev frame. Be careful to not apply this test to
1782 the sentinel frame. */
1783 if (this_frame
->level
>= 0 && !frame_id_p (get_frame_id (this_frame
)))
1787 fprintf_unfiltered (gdb_stdlog
, "-> ");
1788 fprint_frame (gdb_stdlog
, NULL
);
1789 fprintf_unfiltered (gdb_stdlog
, " // this ID is NULL }\n");
1794 /* Check that this frame's ID isn't inner to (younger, below, next)
1795 the next frame. This happens when frame unwind goes backwards.
1796 Since the sentinel frame isn't valid, don't apply this if this
1797 frame is entier the inner-most or sentinel frame. */
1798 if (this_frame
->level
> 0
1799 && frame_id_inner (get_frame_id (this_frame
),
1800 get_frame_id (this_frame
->next
)))
1801 error ("This frame inner-to next frame (corrupt stack?)");
1803 /* Check that this and the next frame are different. If they are
1804 not, there is most likely a stack cycle. As with the inner-than
1805 test, avoid the inner-most and sentinel frames. */
1806 /* FIXME: cagney/2003-03-17: Can't yet enable this this check. The
1807 frame_id_eq() method doesn't yet use function addresses when
1808 comparing frame IDs. */
1810 && this_frame
->level
> 0
1811 && frame_id_eq (get_frame_id (this_frame
),
1812 get_frame_id (this_frame
->next
)))
1813 error ("This frame identical to next frame (corrupt stack?)");
1815 /* Allocate the new frame but do not wire it in to the frame chain.
1816 Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
1817 frame->next to pull some fancy tricks (of course such code is, by
1818 definition, recursive). Try to prevent it.
1820 There is no reason to worry about memory leaks, should the
1821 remainder of the function fail. The allocated memory will be
1822 quickly reclaimed when the frame cache is flushed, and the `we've
1823 been here before' check above will stop repeated memory
1824 allocation calls. */
1825 prev_frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1826 prev_frame
->level
= this_frame
->level
+ 1;
1828 /* Try to unwind the PC. If that doesn't work, assume we've reached
1829 the oldest frame and simply return. Is there a better sentinal
1830 value? The unwound PC value is then used to initialize the new
1831 previous frame's type.
1833 Note that the pc-unwind is intentionally performed before the
1834 frame chain. This is ok since, for old targets, both
1835 frame_pc_unwind (nee, FRAME_SAVED_PC) and
1836 DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
1837 have already been initialized (using
1838 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1841 By unwinding the PC first, it becomes possible to, in the case of
1842 a dummy frame, avoid also unwinding the frame ID. This is
1843 because (well ignoring the PPC) a dummy frame can be located
1844 using THIS_FRAME's frame ID. */
1846 if (frame_pc_unwind (this_frame
) == 0)
1848 /* The allocated PREV_FRAME will be reclaimed when the frame
1849 obstack is next purged. */
1852 fprintf_unfiltered (gdb_stdlog
, "-> ");
1853 fprint_frame (gdb_stdlog
, NULL
);
1854 fprintf_unfiltered (gdb_stdlog
, " // unwound PC zero }\n");
1859 /* Set the unwind functions based on that identified PC. */
1860 prev_frame
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
1861 frame_pc_unwind (this_frame
));
1863 /* FIXME: cagney/2003-04-02: Rather than storing the frame's type in
1864 the frame, the unwinder's type should be returned directly.
1865 Unfortunatly, legacy code, called by legacy_get_prev_frame,
1866 explicitly set the frames type using the method
1867 deprecated_set_frame_type(). */
1868 gdb_assert (prev_frame
->unwind
->type
!= UNKNOWN_FRAME
);
1869 prev_frame
->type
= prev_frame
->unwind
->type
;
1871 /* Can the frame's type and unwinder be computed on demand? That
1872 would make a frame's creation really really lite! */
1874 /* The prev's frame's ID is computed by demand in get_frame_id(). */
1876 /* The unwound frame ID is validate at the start of this function,
1877 as part of the logic to decide if that frame should be further
1878 unwound, and not here while the prev frame is being created.
1879 Doing this makes it possible for the user to examine a frame that
1880 has an invalid frame ID.
1882 The very old VAX frame_args_address_correct() method noted: [...]
1883 For the sake of argument, suppose that the stack is somewhat
1884 trashed (which is one reason that "info frame" exists). So,
1885 return 0 (indicating we don't know the address of the arglist) if
1886 we don't know what frame this frame calls. */
1889 this_frame
->prev
= prev_frame
;
1890 prev_frame
->next
= this_frame
;
1894 fprintf_unfiltered (gdb_stdlog
, "-> ");
1895 fprint_frame (gdb_stdlog
, prev_frame
);
1896 fprintf_unfiltered (gdb_stdlog
, " }\n");
1903 get_frame_pc (struct frame_info
*frame
)
1905 gdb_assert (frame
->next
!= NULL
);
1906 return frame_pc_unwind (frame
->next
);
1910 pc_notcurrent (struct frame_info
*frame
)
1912 /* If FRAME is not the innermost frame, that normally means that
1913 FRAME->pc points at the return instruction (which is *after* the
1914 call instruction), and we want to get the line containing the
1915 call (because the call is where the user thinks the program is).
1916 However, if the next frame is either a SIGTRAMP_FRAME or a
1917 DUMMY_FRAME, then the next frame will contain a saved interrupt
1918 PC and such a PC indicates the current (rather than next)
1919 instruction/line, consequently, for such cases, want to get the
1920 line containing fi->pc. */
1921 struct frame_info
*next
= get_next_frame (frame
);
1922 int notcurrent
= (next
!= NULL
&& get_frame_type (next
) == NORMAL_FRAME
);
1927 find_frame_sal (struct frame_info
*frame
, struct symtab_and_line
*sal
)
1929 (*sal
) = find_pc_line (get_frame_pc (frame
), pc_notcurrent (frame
));
1932 /* Per "frame.h", return the ``address'' of the frame. Code should
1933 really be using get_frame_id(). */
1935 get_frame_base (struct frame_info
*fi
)
1937 return get_frame_id (fi
).stack_addr
;
1940 /* High-level offsets into the frame. Used by the debug info. */
1943 get_frame_base_address (struct frame_info
*fi
)
1945 if (get_frame_type (fi
) != NORMAL_FRAME
)
1947 if (fi
->base
== NULL
)
1948 fi
->base
= frame_base_find_by_pc (current_gdbarch
, get_frame_pc (fi
));
1949 /* Sneaky: If the low-level unwind and high-level base code share a
1950 common unwinder, let them share the prologue cache. */
1951 if (fi
->base
->unwind
== fi
->unwind
)
1952 return fi
->base
->this_base (fi
->next
, &fi
->prologue_cache
);
1953 return fi
->base
->this_base (fi
->next
, &fi
->base_cache
);
1957 get_frame_locals_address (struct frame_info
*fi
)
1960 if (get_frame_type (fi
) != NORMAL_FRAME
)
1962 /* If there isn't a frame address method, find it. */
1963 if (fi
->base
== NULL
)
1964 fi
->base
= frame_base_find_by_pc (current_gdbarch
, get_frame_pc (fi
));
1965 /* Sneaky: If the low-level unwind and high-level base code share a
1966 common unwinder, let them share the prologue cache. */
1967 if (fi
->base
->unwind
== fi
->unwind
)
1968 cache
= &fi
->prologue_cache
;
1970 cache
= &fi
->base_cache
;
1971 return fi
->base
->this_locals (fi
->next
, cache
);
1975 get_frame_args_address (struct frame_info
*fi
)
1978 if (get_frame_type (fi
) != NORMAL_FRAME
)
1980 /* If there isn't a frame address method, find it. */
1981 if (fi
->base
== NULL
)
1982 fi
->base
= frame_base_find_by_pc (current_gdbarch
, get_frame_pc (fi
));
1983 /* Sneaky: If the low-level unwind and high-level base code share a
1984 common unwinder, let them share the prologue cache. */
1985 if (fi
->base
->unwind
== fi
->unwind
)
1986 cache
= &fi
->prologue_cache
;
1988 cache
= &fi
->base_cache
;
1989 return fi
->base
->this_args (fi
->next
, cache
);
1992 /* Level of the selected frame: 0 for innermost, 1 for its caller, ...
1993 or -1 for a NULL frame. */
1996 frame_relative_level (struct frame_info
*fi
)
2005 get_frame_type (struct frame_info
*frame
)
2007 /* Some targets still don't use [generic] dummy frames. Catch them
2009 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
2010 && deprecated_frame_in_dummy (frame
))
2012 if (frame
->type
== UNKNOWN_FRAME
)
2013 return NORMAL_FRAME
;
2019 deprecated_set_frame_type (struct frame_info
*frame
, enum frame_type type
)
2021 /* Arrrg! See comment in "frame.h". */
2025 struct frame_extra_info
*
2026 get_frame_extra_info (struct frame_info
*fi
)
2028 return fi
->extra_info
;
2031 struct frame_extra_info
*
2032 frame_extra_info_zalloc (struct frame_info
*fi
, long size
)
2034 fi
->extra_info
= frame_obstack_zalloc (size
);
2035 return fi
->extra_info
;
2039 deprecated_update_frame_pc_hack (struct frame_info
*frame
, CORE_ADDR pc
)
2042 fprintf_unfiltered (gdb_stdlog
,
2043 "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n",
2044 frame
->level
, paddr_nz (pc
));
2045 /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
2046 maintaining a locally allocated frame object. Since such frame's
2047 are not in the frame chain, it isn't possible to assume that the
2048 frame has a next. Sigh. */
2049 if (frame
->next
!= NULL
)
2051 /* While we're at it, update this frame's cached PC value, found
2052 in the next frame. Oh for the day when "struct frame_info"
2053 is opaque and this hack on hack can just go away. */
2054 frame
->next
->prev_pc
.value
= pc
;
2055 frame
->next
->prev_pc
.p
= 1;
2060 deprecated_update_frame_base_hack (struct frame_info
*frame
, CORE_ADDR base
)
2063 fprintf_unfiltered (gdb_stdlog
,
2064 "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n",
2065 frame
->level
, paddr_nz (base
));
2066 /* See comment in "frame.h". */
2067 frame
->this_id
.value
.stack_addr
= base
;
2071 deprecated_set_frame_saved_regs_hack (struct frame_info
*frame
,
2072 CORE_ADDR
*saved_regs
)
2074 frame
->saved_regs
= saved_regs
;
2078 deprecated_set_frame_extra_info_hack (struct frame_info
*frame
,
2079 struct frame_extra_info
*extra_info
)
2081 frame
->extra_info
= extra_info
;
2085 deprecated_set_frame_next_hack (struct frame_info
*fi
,
2086 struct frame_info
*next
)
2092 deprecated_set_frame_prev_hack (struct frame_info
*fi
,
2093 struct frame_info
*prev
)
2099 deprecated_get_frame_context (struct frame_info
*fi
)
2105 deprecated_set_frame_context (struct frame_info
*fi
,
2106 struct context
*context
)
2108 fi
->context
= context
;
2112 deprecated_frame_xmalloc (void)
2114 struct frame_info
*frame
= XMALLOC (struct frame_info
);
2115 memset (frame
, 0, sizeof (struct frame_info
));
2120 deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs
,
2121 long sizeof_extra_info
)
2123 struct frame_info
*frame
= deprecated_frame_xmalloc ();
2124 make_cleanup (xfree
, frame
);
2125 if (sizeof_saved_regs
> 0)
2127 frame
->saved_regs
= xcalloc (1, sizeof_saved_regs
);
2128 make_cleanup (xfree
, frame
->saved_regs
);
2130 if (sizeof_extra_info
> 0)
2132 frame
->extra_info
= xcalloc (1, sizeof_extra_info
);
2133 make_cleanup (xfree
, frame
->extra_info
);
2139 legacy_frame_p (struct gdbarch
*current_gdbarch
)
2141 return (DEPRECATED_INIT_FRAME_PC_P ()
2142 || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
2143 || DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
2144 || DEPRECATED_FRAME_CHAIN_P ()
2145 || !gdbarch_unwind_dummy_id_p (current_gdbarch
)
2146 || !SAVE_DUMMY_FRAME_TOS_P ());
2150 _initialize_frame (void)
2152 obstack_init (&frame_cache_obstack
);
2154 /* FIXME: cagney/2003-01-19: This command needs a rename. Suggest
2155 `set backtrace {past,beyond,...}-main'. Also suggest adding `set
2156 backtrace ...-start' to control backtraces past start. The
2157 problem with `below' is that it stops the `up' command. */
2159 add_setshow_boolean_cmd ("backtrace-below-main", class_obscure
,
2160 &backtrace_below_main
, "\
2161 Set whether backtraces should continue past \"main\".\n\
2162 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2163 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2164 of the stack trace.", "\
2165 Show whether backtraces should continue past \"main\".\n\
2166 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2167 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2168 of the stack trace.",
2169 NULL
, NULL
, &setlist
, &showlist
);
2172 /* Debug this files internals. */
2173 add_show_from_set (add_set_cmd ("frame", class_maintenance
, var_zinteger
,
2174 &frame_debug
, "Set frame debugging.\n\
2175 When non-zero, frame specific internal debugging is enabled.", &setdebuglist
),