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"
42 /* Flag to indicate whether backtraces should stop at main. */
44 static int backtrace_below_main
;
46 /* Return a frame uniq ID that can be used to, later, re-find the
50 get_frame_id (struct frame_info
*fi
)
65 const struct frame_id null_frame_id
; /* All zeros. */
68 frame_id_build (CORE_ADDR base
, CORE_ADDR func_or_pc
)
77 frame_id_p (struct frame_id l
)
79 /* The .func can be NULL but the .base cannot. */
84 frame_id_eq (struct frame_id l
, struct frame_id r
)
86 /* If .base is different, the frames are different. */
89 /* Add a test to check that the frame ID's are for the same function
95 frame_id_inner (struct frame_id l
, struct frame_id r
)
97 /* Only return non-zero when strictly inner than. Note that, per
98 comment in "frame.h", there is some fuzz here. Frameless
99 functions are not strictly inner than (same .base but different
101 return INNER_THAN (l
.base
, r
.base
);
105 frame_find_by_id (struct frame_id id
)
107 struct frame_info
*frame
;
109 /* ZERO denotes the null frame, let the caller decide what to do
110 about it. Should it instead return get_current_frame()? */
111 if (!frame_id_p (id
))
114 for (frame
= get_current_frame ();
116 frame
= get_prev_frame (frame
))
118 struct frame_id
this = get_frame_id (frame
);
119 if (frame_id_eq (id
, this))
120 /* An exact match. */
122 if (frame_id_inner (id
, this))
125 /* Either, we're not yet gone far enough out along the frame
126 chain (inner(this,id), or we're comparing frameless functions
127 (same .base, different .func, no test available). Struggle
128 on until we've definitly gone to far. */
134 frame_pc_unwind (struct frame_info
*frame
)
136 if (!frame
->pc_unwind_cache_p
)
138 frame
->pc_unwind_cache
= frame
->unwind
->pc (frame
, &frame
->unwind_cache
);
139 frame
->pc_unwind_cache_p
= 1;
141 return frame
->pc_unwind_cache
;
145 frame_id_unwind (struct frame_info
*frame
)
147 if (!frame
->id_unwind_cache_p
)
149 frame
->unwind
->id (frame
, &frame
->unwind_cache
, &frame
->id_unwind_cache
);
150 frame
->id_unwind_cache_p
= 1;
152 return frame
->id_unwind_cache
;
156 frame_pop (struct frame_info
*frame
)
158 /* FIXME: cagney/2003-01-18: There is probably a chicken-egg problem
159 with passing in current_regcache. The pop function needs to be
160 written carefully so as to not overwrite registers whose [old]
161 values are needed to restore other registers. Instead, this code
162 should pass in a scratch cache and, as a second step, restore the
163 registers using that. */
164 frame
->unwind
->pop (frame
, &frame
->unwind_cache
, current_regcache
);
165 flush_cached_frames ();
169 frame_register_unwind (struct frame_info
*frame
, int regnum
,
170 int *optimizedp
, enum lval_type
*lvalp
,
171 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
173 struct frame_unwind_cache
*cache
;
175 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
176 that the value proper does not need to be fetched. */
177 gdb_assert (optimizedp
!= NULL
);
178 gdb_assert (lvalp
!= NULL
);
179 gdb_assert (addrp
!= NULL
);
180 gdb_assert (realnump
!= NULL
);
181 /* gdb_assert (bufferp != NULL); */
183 /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame
184 is broken. There is always a frame. If there, for some reason,
185 isn't, there is some pretty busted code as it should have
186 detected the problem before calling here. */
187 gdb_assert (frame
!= NULL
);
189 /* Ask this frame to unwind its register. */
190 frame
->unwind
->reg (frame
, &frame
->unwind_cache
, regnum
,
191 optimizedp
, lvalp
, addrp
, realnump
, bufferp
);
195 frame_register (struct frame_info
*frame
, int regnum
,
196 int *optimizedp
, enum lval_type
*lvalp
,
197 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
199 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
200 that the value proper does not need to be fetched. */
201 gdb_assert (optimizedp
!= NULL
);
202 gdb_assert (lvalp
!= NULL
);
203 gdb_assert (addrp
!= NULL
);
204 gdb_assert (realnump
!= NULL
);
205 /* gdb_assert (bufferp != NULL); */
207 /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
208 of the register in the register cache. It should instead return
209 the REGNUM corresponding to that register. Translate the . */
210 if (GET_SAVED_REGISTER_P ())
212 GET_SAVED_REGISTER (bufferp
, optimizedp
, addrp
, frame
, regnum
, lvalp
);
213 /* Compute the REALNUM if the caller wants it. */
214 if (*lvalp
== lval_register
)
217 for (regnum
= 0; regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
; regnum
++)
219 if (*addrp
== register_offset_hack (current_gdbarch
, regnum
))
225 internal_error (__FILE__
, __LINE__
,
226 "Failed to compute the register number corresponding"
227 " to 0x%s", paddr_d (*addrp
));
233 /* Obtain the register value by unwinding the register from the next
234 (more inner frame). */
235 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
236 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
241 frame_unwind_signed_register (struct frame_info
*frame
, int regnum
,
248 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
249 frame_register_unwind (frame
, regnum
, &optimized
, &lval
, &addr
,
251 (*val
) = extract_signed_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
255 frame_unwind_unsigned_register (struct frame_info
*frame
, int regnum
,
262 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
263 frame_register_unwind (frame
, regnum
, &optimized
, &lval
, &addr
,
265 (*val
) = extract_unsigned_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
269 frame_read_unsigned_register (struct frame_info
*frame
, int regnum
,
272 /* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is
273 always a frame. Both this, and the equivalent
274 frame_read_signed_register() function, can only be called with a
275 valid frame. If, for some reason, this function is called
276 without a frame then the problem isn't here, but rather in the
277 caller. It should of first created a frame and then passed that
279 /* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the
280 ``current_frame'' should not be treated as a special case. While
281 ``get_next_frame (current_frame) == NULL'' currently holds, it
282 should, as far as possible, not be relied upon. In the future,
283 ``get_next_frame (current_frame)'' may instead simply return a
284 normal frame object that simply always gets register values from
285 the register cache. Consequently, frame code should try to avoid
286 tests like ``if get_next_frame() == NULL'' and instead just rely
287 on recursive frame calls (like the below code) when manipulating
289 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
290 frame_unwind_unsigned_register (frame
->next
, regnum
, val
);
294 frame_read_signed_register (struct frame_info
*frame
, int regnum
,
297 /* See note above in frame_read_unsigned_register(). */
298 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
299 frame_unwind_signed_register (frame
->next
, regnum
, val
);
303 generic_unwind_get_saved_register (char *raw_buffer
,
306 struct frame_info
*frame
,
308 enum lval_type
*lvalp
)
313 enum lval_type lvalx
;
315 if (!target_has_registers
)
316 error ("No registers.");
318 /* Keep things simple, ensure that all the pointers (except valuep)
320 if (optimizedp
== NULL
)
321 optimizedp
= &optimizedx
;
327 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
328 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
329 &realnumx
, raw_buffer
);
333 get_saved_register (char *raw_buffer
,
336 struct frame_info
*frame
,
338 enum lval_type
*lval
)
340 if (GET_SAVED_REGISTER_P ())
342 GET_SAVED_REGISTER (raw_buffer
, optimized
, addrp
, frame
, regnum
, lval
);
345 generic_unwind_get_saved_register (raw_buffer
, optimized
, addrp
, frame
,
349 /* frame_register_read ()
351 Find and return the value of REGNUM for the specified stack frame.
352 The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
354 Returns 0 if the register value could not be found. */
357 frame_register_read (struct frame_info
*frame
, int regnum
, void *myaddr
)
363 frame_register (frame
, regnum
, &optimized
, &lval
, &addr
, &realnum
, myaddr
);
365 /* FIXME: cagney/2002-05-15: This test, is just bogus.
367 It indicates that the target failed to supply a value for a
368 register because it was "not available" at this time. Problem
369 is, the target still has the register and so get saved_register()
370 may be returning a value saved on the stack. */
372 if (register_cached (regnum
) < 0)
373 return 0; /* register value not available */
379 /* Map between a frame register number and its name. A frame register
380 space is a superset of the cooked register space --- it also
381 includes builtin registers. */
384 frame_map_name_to_regnum (const char *name
, int len
)
391 /* Search register name space. */
392 for (i
= 0; i
< NUM_REGS
+ NUM_PSEUDO_REGS
; i
++)
393 if (REGISTER_NAME (i
) && len
== strlen (REGISTER_NAME (i
))
394 && strncmp (name
, REGISTER_NAME (i
), len
) == 0)
399 /* Try builtin registers. */
400 i
= builtin_reg_map_name_to_regnum (name
, len
);
403 /* A builtin register doesn't fall into the architecture's
405 gdb_assert (i
>= NUM_REGS
+ NUM_PSEUDO_REGS
);
413 frame_map_regnum_to_name (int regnum
)
417 if (regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
)
418 return REGISTER_NAME (regnum
);
419 return builtin_reg_map_regnum_to_name (regnum
);
422 /* Create a sentinel frame. */
425 create_sentinel_frame (struct regcache
*regcache
)
427 struct frame_info
*frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
428 frame
->type
= NORMAL_FRAME
;
430 /* Explicitly initialize the sentinel frame's cache. Provide it
431 with the underlying regcache. In the future additional
432 information, such as the frame's thread will be added. */
433 frame
->unwind_cache
= sentinel_frame_cache (regcache
);
434 /* For the moment there is only one sentinel frame implementation. */
435 frame
->unwind
= sentinel_frame_unwind
;
436 /* Link this frame back to itself. The frame is self referential
437 (the unwound PC is the same as the pc), so make it so. */
439 /* Always unwind the PC as part of creating this frame. This
440 ensures that the frame's PC points at something valid. */
441 /* FIXME: cagney/2003-01-10: Problem here. Unwinding a sentinel
442 frame's PC may require information such as the frame's thread's
443 stop reason. Is it possible to get to that? */
444 frame
->pc
= frame_pc_unwind (frame
);
448 /* Info about the innermost stack frame (contents of FP register) */
450 static struct frame_info
*current_frame
;
452 /* Cache for frame addresses already read by gdb. Valid only while
453 inferior is stopped. Control variables for the frame cache should
454 be local to this module. */
456 static struct obstack frame_cache_obstack
;
459 frame_obstack_zalloc (unsigned long size
)
461 void *data
= obstack_alloc (&frame_cache_obstack
, size
);
462 memset (data
, 0, size
);
467 frame_saved_regs_zalloc (struct frame_info
*fi
)
469 fi
->saved_regs
= (CORE_ADDR
*)
470 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
471 return fi
->saved_regs
;
475 get_frame_saved_regs (struct frame_info
*fi
)
477 return fi
->saved_regs
;
480 /* Return the innermost (currently executing) stack frame. This is
481 split into two functions. The function unwind_to_current_frame()
482 is wrapped in catch exceptions so that, even when the unwind of the
483 sentinel frame fails, the function still returns a stack frame. */
486 unwind_to_current_frame (struct ui_out
*ui_out
, void *args
)
488 struct frame_info
*frame
= get_prev_frame (args
);
489 /* A sentinel frame can fail to unwind, eg, because it's PC value
490 lands in somewhere like start. */
493 current_frame
= frame
;
498 get_current_frame (void)
500 if (!target_has_stack
)
502 if (!target_has_registers
)
503 error ("No registers.");
504 if (!target_has_memory
)
505 error ("No memory.");
506 if (current_frame
== NULL
)
508 struct frame_info
*sentinel_frame
=
509 create_sentinel_frame (current_regcache
);
510 if (catch_exceptions (uiout
, unwind_to_current_frame
, sentinel_frame
,
511 NULL
, RETURN_MASK_ERROR
) != 0)
513 /* Oops! Fake a current frame? Is this useful? It has a PC
514 of zero, for instance. */
515 current_frame
= sentinel_frame
;
518 return current_frame
;
521 /* The "selected" stack frame is used by default for local and arg
522 access. May be zero, for no selected frame. */
524 struct frame_info
*deprecated_selected_frame
;
526 /* Return the selected frame. Always non-null (unless there isn't an
527 inferior sufficient for creating a frame) in which case an error is
531 get_selected_frame (void)
533 if (deprecated_selected_frame
== NULL
)
534 /* Hey! Don't trust this. It should really be re-finding the
535 last selected frame of the currently selected thread. This,
536 though, is better than nothing. */
537 select_frame (get_current_frame ());
538 /* There is always a frame. */
539 gdb_assert (deprecated_selected_frame
!= NULL
);
540 return deprecated_selected_frame
;
543 /* Select frame FI (or NULL - to invalidate the current frame). */
546 select_frame (struct frame_info
*fi
)
548 register struct symtab
*s
;
550 deprecated_selected_frame
= fi
;
551 /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
552 frame is being invalidated. */
553 if (selected_frame_level_changed_hook
)
554 selected_frame_level_changed_hook (frame_relative_level (fi
));
556 /* FIXME: kseitz/2002-08-28: It would be nice to call
557 selected_frame_level_changed_event right here, but due to limitations
558 in the current interfaces, we would end up flooding UIs with events
559 because select_frame is used extensively internally.
561 Once we have frame-parameterized frame (and frame-related) commands,
562 the event notification can be moved here, since this function will only
563 be called when the users selected frame is being changed. */
565 /* Ensure that symbols for this frame are read in. Also, determine the
566 source language of this frame, and switch to it if desired. */
569 s
= find_pc_symtab (fi
->pc
);
571 && s
->language
!= current_language
->la_language
572 && s
->language
!= language_unknown
573 && language_mode
== language_mode_auto
)
575 set_language (s
->language
);
580 /* Return the register saved in the simplistic ``saved_regs'' cache.
581 If the value isn't here AND a value is needed, try the next inner
585 frame_saved_regs_register_unwind (struct frame_info
*frame
, void **cache
,
586 int regnum
, int *optimizedp
,
587 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
588 int *realnump
, void *bufferp
)
590 /* There is always a frame at this point. And THIS is the frame
591 we're interested in. */
592 gdb_assert (frame
!= NULL
);
593 /* If we're using generic dummy frames, we'd better not be in a call
594 dummy. (generic_call_dummy_register_unwind ought to have been called
596 gdb_assert (!(DEPRECATED_USE_GENERIC_DUMMY_FRAMES
597 && (get_frame_type (frame
) == DUMMY_FRAME
)));
599 /* Only (older) architectures that implement the
600 FRAME_INIT_SAVED_REGS method should be using this function. */
601 gdb_assert (FRAME_INIT_SAVED_REGS_P ());
603 /* Load the saved_regs register cache. */
604 if (get_frame_saved_regs (frame
) == NULL
)
605 FRAME_INIT_SAVED_REGS (frame
);
607 if (get_frame_saved_regs (frame
) != NULL
608 && get_frame_saved_regs (frame
)[regnum
] != 0)
610 if (regnum
== SP_REGNUM
)
612 /* SP register treated specially. */
618 store_address (bufferp
, REGISTER_RAW_SIZE (regnum
),
619 get_frame_saved_regs (frame
)[regnum
]);
623 /* Any other register is saved in memory, fetch it but cache
624 a local copy of its value. */
626 *lvalp
= lval_memory
;
627 *addrp
= get_frame_saved_regs (frame
)[regnum
];
632 /* Save each register value, as it is read in, in a
633 frame based cache. */
634 void **regs
= (*cache
);
637 int sizeof_cache
= ((NUM_REGS
+ NUM_PSEUDO_REGS
)
639 regs
= frame_obstack_zalloc (sizeof_cache
);
642 if (regs
[regnum
] == NULL
)
645 = frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum
));
646 read_memory (get_frame_saved_regs (frame
)[regnum
], regs
[regnum
],
647 REGISTER_RAW_SIZE (regnum
));
649 memcpy (bufferp
, regs
[regnum
], REGISTER_RAW_SIZE (regnum
));
651 /* Read the value in from memory. */
652 read_memory (get_frame_saved_regs (frame
)[regnum
], bufferp
,
653 REGISTER_RAW_SIZE (regnum
));
660 /* No luck, assume this and the next frame have the same register
661 value. Pass the request down the frame chain to the next frame.
662 Hopefully that will find the register's location, either in a
663 register or in memory. */
664 frame_register (frame
, regnum
, optimizedp
, lvalp
, addrp
, realnump
,
669 frame_saved_regs_pc_unwind (struct frame_info
*frame
, void **cache
)
671 gdb_assert (FRAME_SAVED_PC_P ());
672 return FRAME_SAVED_PC (frame
);
676 frame_saved_regs_id_unwind (struct frame_info
*next_frame
, void **cache
,
683 /* Start out by assuming it's NULL. */
684 (*id
) = null_frame_id
;
686 if (frame_relative_level (next_frame
) <= 0)
687 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
688 the frame chain, not just the inner most frame! The generic,
689 per-architecture, frame code should handle this and the below
690 should simply be removed. */
691 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (next_frame
);
696 /* A frameless inner-most frame. The `FP' (which isn't an
697 architecture frame-pointer register!) of the caller is the same
699 /* FIXME: 2002-11-09: There isn't any reason to special case this
700 edge condition. Instead the per-architecture code should hande
702 base
= get_frame_base (next_frame
);
705 /* Two macros defined in tm.h specify the machine-dependent
706 actions to be performed here.
708 First, get the frame's chain-pointer.
710 If that is zero, the frame is the outermost frame or a leaf
711 called by the outermost frame. This means that if start
712 calls main without a frame, we'll return 0 (which is fine
715 Nope; there's a problem. This also returns when the current
716 routine is a leaf of main. This is unacceptable. We move
717 this to after the ffi test; I'd rather have backtraces from
718 start go curfluy than have an abort called from main not show
720 gdb_assert (FRAME_CHAIN_P ());
721 base
= FRAME_CHAIN (next_frame
);
723 if (!frame_chain_valid (base
, next_frame
))
729 /* FIXME: cagney/2002-06-08: This should probably return the frame's
730 function and not the PC (a.k.a. resume address). */
731 pc
= frame_pc_unwind (next_frame
);
737 frame_saved_regs_pop (struct frame_info
*fi
, void **cache
,
738 struct regcache
*regcache
)
740 gdb_assert (POP_FRAME_P ());
744 const struct frame_unwind trad_frame_unwinder
= {
745 frame_saved_regs_pop
,
746 frame_saved_regs_pc_unwind
,
747 frame_saved_regs_id_unwind
,
748 frame_saved_regs_register_unwind
750 const struct frame_unwind
*trad_frame_unwind
= &trad_frame_unwinder
;
753 /* Function: get_saved_register
754 Find register number REGNUM relative to FRAME and put its (raw,
755 target format) contents in *RAW_BUFFER.
757 Set *OPTIMIZED if the variable was optimized out (and thus can't be
758 fetched). Note that this is never set to anything other than zero
759 in this implementation.
761 Set *LVAL to lval_memory, lval_register, or not_lval, depending on
762 whether the value was fetched from memory, from a register, or in a
763 strange and non-modifiable way (e.g. a frame pointer which was
764 calculated rather than fetched). We will use not_lval for values
765 fetched from generic dummy frames.
767 Set *ADDRP to the address, either in memory or as a REGISTER_BYTE
768 offset into the registers array. If the value is stored in a dummy
769 frame, set *ADDRP to zero.
771 To use this implementation, define a function called
772 "get_saved_register" in your target code, which simply passes all
773 of its arguments to this function.
775 The argument RAW_BUFFER must point to aligned memory. */
778 deprecated_generic_get_saved_register (char *raw_buffer
, int *optimized
,
780 struct frame_info
*frame
, int regnum
,
781 enum lval_type
*lval
)
783 if (!target_has_registers
)
784 error ("No registers.");
786 gdb_assert (FRAME_INIT_SAVED_REGS_P ());
788 /* Normal systems don't optimize out things with register numbers. */
789 if (optimized
!= NULL
)
792 if (addrp
) /* default assumption: not found in memory */
795 /* Note: since the current frame's registers could only have been
796 saved by frames INTERIOR TO the current frame, we skip examining
797 the current frame itself: otherwise, we would be getting the
798 previous frame's registers which were saved by the current frame. */
802 for (frame
= get_next_frame (frame
);
803 frame_relative_level (frame
) >= 0;
804 frame
= get_next_frame (frame
))
806 if (get_frame_type (frame
) == DUMMY_FRAME
)
808 if (lval
) /* found it in a CALL_DUMMY frame */
811 /* FIXME: cagney/2002-06-26: This should be via the
812 gdbarch_register_read() method so that it, on the
813 fly, constructs either a raw or pseudo register
814 from the raw register cache. */
816 (generic_find_dummy_frame (get_frame_pc (frame
),
817 get_frame_base (frame
)),
822 FRAME_INIT_SAVED_REGS (frame
);
823 if (get_frame_saved_regs (frame
) != NULL
824 && get_frame_saved_regs (frame
)[regnum
] != 0)
826 if (lval
) /* found it saved on the stack */
828 if (regnum
== SP_REGNUM
)
830 if (raw_buffer
) /* SP register treated specially */
831 store_address (raw_buffer
, REGISTER_RAW_SIZE (regnum
),
832 get_frame_saved_regs (frame
)[regnum
]);
836 if (addrp
) /* any other register */
837 *addrp
= get_frame_saved_regs (frame
)[regnum
];
839 read_memory (get_frame_saved_regs (frame
)[regnum
], raw_buffer
,
840 REGISTER_RAW_SIZE (regnum
));
847 /* If we get thru the loop to this point, it means the register was
848 not saved in any frame. Return the actual live-register value. */
850 if (lval
) /* found it in a live register */
851 *lval
= lval_register
;
853 *addrp
= REGISTER_BYTE (regnum
);
855 deprecated_read_register_gen (regnum
, raw_buffer
);
858 /* Determine the frame's type based on its PC. */
860 static enum frame_type
861 frame_type_from_pc (CORE_ADDR pc
)
863 /* FIXME: cagney/2002-11-24: Can't yet directly call
864 pc_in_dummy_frame() as some architectures don't set
865 PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
866 latter is implemented by simply calling pc_in_dummy_frame). */
867 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
868 && DEPRECATED_PC_IN_CALL_DUMMY (pc
, 0, 0))
873 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
874 if (PC_IN_SIGTRAMP (pc
, name
))
875 return SIGTRAMP_FRAME
;
881 /* Create an arbitrary (i.e. address specified by user) or innermost frame.
882 Always returns a non-NULL value. */
885 create_new_frame (CORE_ADDR addr
, CORE_ADDR pc
)
887 struct frame_info
*fi
;
889 fi
= frame_obstack_zalloc (sizeof (struct frame_info
));
893 fi
->next
= create_sentinel_frame (current_regcache
);
894 fi
->type
= frame_type_from_pc (pc
);
896 if (INIT_EXTRA_FRAME_INFO_P ())
897 INIT_EXTRA_FRAME_INFO (0, fi
);
899 /* Select/initialize an unwind function. */
900 fi
->unwind
= frame_unwind_find_by_pc (current_gdbarch
, fi
->pc
);
905 /* Return the frame that FRAME calls (NULL if FRAME is the innermost
906 frame). Be careful to not fall off the bottom of the frame chain
907 and onto the sentinel frame. */
910 get_next_frame (struct frame_info
*frame
)
912 if (frame
->level
> 0)
918 /* Flush the entire frame cache. */
921 flush_cached_frames (void)
923 /* Since we can't really be sure what the first object allocated was */
924 obstack_free (&frame_cache_obstack
, 0);
925 obstack_init (&frame_cache_obstack
);
927 current_frame
= NULL
; /* Invalidate cache */
929 annotate_frames_invalid ();
932 /* Flush the frame cache, and start a new one if necessary. */
935 reinit_frame_cache (void)
937 flush_cached_frames ();
939 /* FIXME: The inferior_ptid test is wrong if there is a corefile. */
940 if (PIDGET (inferior_ptid
) != 0)
942 select_frame (get_current_frame ());
946 /* Create the previous frame using the deprecated methods
947 INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
949 static struct frame_info
*
950 legacy_get_prev_frame (struct frame_info
*next_frame
)
952 CORE_ADDR address
= 0;
953 struct frame_info
*prev
;
956 /* This code only works on normal frames. A sentinel frame, where
957 the level is -1, should never reach this code. */
958 gdb_assert (next_frame
->level
>= 0);
960 /* On some machines it is possible to call a function without
961 setting up a stack frame for it. On these machines, we
962 define this macro to take two args; a frameinfo pointer
963 identifying a frame and a variable to set or clear if it is
964 or isn't leafless. */
966 /* Still don't want to worry about this except on the innermost
967 frame. This macro will set FROMLEAF if NEXT_FRAME is a frameless
968 function invocation. */
969 if (next_frame
->level
== 0)
970 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
971 the frame chain, not just the inner most frame! The generic,
972 per-architecture, frame code should handle this and the below
973 should simply be removed. */
974 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (next_frame
);
979 /* A frameless inner-most frame. The `FP' (which isn't an
980 architecture frame-pointer register!) of the caller is the same
982 /* FIXME: 2002-11-09: There isn't any reason to special case this
983 edge condition. Instead the per-architecture code should hande
985 address
= get_frame_base (next_frame
);
988 /* Two macros defined in tm.h specify the machine-dependent
989 actions to be performed here.
991 First, get the frame's chain-pointer.
993 If that is zero, the frame is the outermost frame or a leaf
994 called by the outermost frame. This means that if start
995 calls main without a frame, we'll return 0 (which is fine
998 Nope; there's a problem. This also returns when the current
999 routine is a leaf of main. This is unacceptable. We move
1000 this to after the ffi test; I'd rather have backtraces from
1001 start go curfluy than have an abort called from main not show
1003 gdb_assert (FRAME_CHAIN_P ());
1004 address
= FRAME_CHAIN (next_frame
);
1006 if (!frame_chain_valid (address
, next_frame
))
1012 /* Create an initially zero previous frame. */
1013 prev
= frame_obstack_zalloc (sizeof (struct frame_info
));
1016 next_frame
->prev
= prev
;
1017 prev
->next
= next_frame
;
1018 prev
->frame
= address
;
1019 prev
->level
= next_frame
->level
+ 1;
1020 /* FIXME: cagney/2002-11-18: Should be setting the frame's type
1021 here, before anything else, and not last. Various INIT functions
1022 are full of work-arounds for the frames type not being set
1023 correctly from the word go. Ulgh! */
1024 prev
->type
= NORMAL_FRAME
;
1026 /* This change should not be needed, FIXME! We should determine
1027 whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
1028 after INIT_EXTRA_FRAME_INFO and come up with a simple way to
1029 express what goes on here.
1031 INIT_EXTRA_FRAME_INFO is called from two places: create_new_frame
1032 (where the PC is already set up) and here (where it isn't).
1033 DEPRECATED_INIT_FRAME_PC is only called from here, always after
1034 INIT_EXTRA_FRAME_INFO.
1036 The catch is the MIPS, where INIT_EXTRA_FRAME_INFO requires the
1037 PC value (which hasn't been set yet). Some other machines appear
1038 to require INIT_EXTRA_FRAME_INFO before they can do
1039 DEPRECATED_INIT_FRAME_PC. Phoo.
1041 We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
1042 complication to an already overcomplicated part of GDB.
1043 gnu@cygnus.com, 15Sep92.
1045 Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
1046 INIT_EXTRA_FRAME_INFO, one possible scheme:
1048 SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
1049 (read_fp ()), read_pc ()). Machines with extra frame info would
1050 do that (or the local equivalent) and then set the extra fields.
1052 SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
1053 create_new_frame would no longer init extra frame info;
1054 SETUP_ARBITRARY_FRAME would have to do that.
1056 INIT_PREV_FRAME(fromleaf, prev) Replace INIT_EXTRA_FRAME_INFO and
1057 DEPRECATED_INIT_FRAME_PC. This should also return a flag saying
1058 whether to keep the new frame, or whether to discard it, because
1059 on some machines (e.g. mips) it is really awkward to have
1060 FRAME_CHAIN_VALID called *before* INIT_EXTRA_FRAME_INFO (there is
1061 no good way to get information deduced in FRAME_CHAIN_VALID into
1062 the extra fields of the new frame). std_frame_pc(fromleaf, prev)
1064 This is the default setting for INIT_PREV_FRAME. It just does
1065 what the default DEPRECATED_INIT_FRAME_PC does. Some machines
1066 will call it from INIT_PREV_FRAME (either at the beginning, the
1067 end, or in the middle). Some machines won't use it.
1069 kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
1071 /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
1072 reason for things to be this complicated.
1074 The trick is to assume that there is always a frame. Instead of
1075 special casing the inner-most frame, create fake frame
1076 (containing the hardware registers) that is inner to the
1077 user-visible inner-most frame (...) and then unwind from that.
1078 That way architecture code can use use the standard
1079 frame_XX_unwind() functions and not differentiate between the
1080 inner most and any other case.
1082 Since there is always a frame to unwind from, there is always
1083 somewhere (NEXT_FRAME) to store all the info needed to construct
1084 a new (previous) frame without having to first create it. This
1085 means that the convolution below - needing to carefully order a
1086 frame's initialization - isn't needed.
1088 The irony here though, is that FRAME_CHAIN(), at least for a more
1089 up-to-date architecture, always calls FRAME_SAVED_PC(), and
1090 FRAME_SAVED_PC() computes the PC but without first needing the
1091 frame! Instead of the convolution below, we could have simply
1092 called FRAME_SAVED_PC() and been done with it! Note that
1093 FRAME_SAVED_PC() is being superseed by frame_pc_unwind() and that
1094 function does have somewhere to cache that PC value. */
1096 if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
1097 prev
->pc
= (DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf
, prev
));
1099 if (INIT_EXTRA_FRAME_INFO_P ())
1100 INIT_EXTRA_FRAME_INFO (fromleaf
, prev
);
1102 /* This entry is in the frame queue now, which is good since
1103 FRAME_SAVED_PC may use that queue to figure out its value (see
1104 tm-sparc.h). We want the pc saved in the inferior frame. */
1105 if (DEPRECATED_INIT_FRAME_PC_P ())
1106 prev
->pc
= DEPRECATED_INIT_FRAME_PC (fromleaf
, prev
);
1108 /* If ->frame and ->pc are unchanged, we are in the process of
1109 getting ourselves into an infinite backtrace. Some architectures
1110 check this in FRAME_CHAIN or thereabouts, but it seems like there
1111 is no reason this can't be an architecture-independent check. */
1112 if (prev
->frame
== next_frame
->frame
1113 && prev
->pc
== next_frame
->pc
)
1115 next_frame
->prev
= NULL
;
1116 obstack_free (&frame_cache_obstack
, prev
);
1120 /* Initialize the code used to unwind the frame PREV based on the PC
1121 (and probably other architectural information). The PC lets you
1122 check things like the debug info at that point (dwarf2cfi?) and
1123 use that to decide how the frame should be unwound. */
1124 prev
->unwind
= frame_unwind_find_by_pc (current_gdbarch
, prev
->pc
);
1126 /* NOTE: cagney/2002-11-18: The code segments, found in
1127 create_new_frame and get_prev_frame(), that initializes the
1128 frames type is subtly different. The latter only updates ->type
1129 when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
1130 get_prev_frame() overriding the frame's type when the INIT code
1131 has previously set it. This is really somewhat bogus. The
1132 initialization, as seen in create_new_frame(), should occur
1133 before the INIT function has been called. */
1134 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1135 && (DEPRECATED_PC_IN_CALL_DUMMY_P ()
1136 ? DEPRECATED_PC_IN_CALL_DUMMY (prev
->pc
, 0, 0)
1137 : pc_in_dummy_frame (prev
->pc
)))
1138 prev
->type
= DUMMY_FRAME
;
1141 /* FIXME: cagney/2002-11-10: This should be moved to before the
1142 INIT code above so that the INIT code knows what the frame's
1143 type is (in fact, for a [generic] dummy-frame, the type can
1144 be set and then the entire initialization can be skipped.
1145 Unforunatly, its the INIT code that sets the PC (Hmm, catch
1148 find_pc_partial_function (prev
->pc
, &name
, NULL
, NULL
);
1149 if (PC_IN_SIGTRAMP (prev
->pc
, name
))
1150 prev
->type
= SIGTRAMP_FRAME
;
1151 /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
1152 architectures are forcing the frame's type in INIT so we
1153 don't want to override it here. Remember, NORMAL_FRAME == 0,
1154 so it all works (just :-/). Once this initialization is
1155 moved to the start of this function, all this nastness will
1162 /* Return a structure containing various interesting information
1163 about the frame that called NEXT_FRAME. Returns NULL
1164 if there is no such frame. */
1167 get_prev_frame (struct frame_info
*next_frame
)
1169 struct frame_info
*prev_frame
;
1171 /* Return the inner-most frame, when the caller passes in NULL. */
1172 /* NOTE: cagney/2002-11-09: Not sure how this would happen. The
1173 caller should have previously obtained a valid frame using
1174 get_selected_frame() and then called this code - only possibility
1175 I can think of is code behaving badly.
1177 NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
1178 block_innermost_frame(). It does the sequence: frame = NULL;
1179 while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
1180 it couldn't be written better, I don't know.
1182 NOTE: cagney/2003-01-11: I suspect what is happening is
1183 block_innermost_frame() is, when the target has no state
1184 (registers, memory, ...), still calling this function. The
1185 assumption being that this function will return NULL indicating
1186 that a frame isn't possible, rather than checking that the target
1187 has state and then calling get_current_frame() and
1188 get_prev_frame(). This is a guess mind. */
1189 if (next_frame
== NULL
)
1191 /* NOTE: cagney/2002-11-09: There was a code segment here that
1192 would error out when CURRENT_FRAME was NULL. The comment
1193 that went with it made the claim ...
1195 ``This screws value_of_variable, which just wants a nice
1196 clean NULL return from block_innermost_frame if there are no
1197 frames. I don't think I've ever seen this message happen
1198 otherwise. And returning NULL here is a perfectly legitimate
1201 Per the above, this code shouldn't even be called with a NULL
1203 return current_frame
;
1206 /* There is always a frame. If this assertion fails, suspect that
1207 something should be calling get_selected_frame() or
1208 get_current_frame(). */
1209 gdb_assert (next_frame
!= NULL
);
1211 if (next_frame
->level
>= 0
1212 && !backtrace_below_main
1213 && inside_main_func (get_frame_pc (next_frame
)))
1214 /* Don't unwind past main(), bug always unwind the sentinel frame.
1215 Note, this is done _before_ the frame has been marked as
1216 previously unwound. That way if the user later decides to
1217 allow unwinds past main(), that just happens. */
1220 /* Only try to do the unwind once. */
1221 if (next_frame
->prev_p
)
1222 return next_frame
->prev
;
1223 next_frame
->prev_p
= 1;
1225 /* If we're inside the entry file, it isn't valid. */
1226 /* NOTE: drow/2002-12-25: should there be a way to disable this
1227 check? It assumes a single small entry file, and the way some
1228 debug readers (e.g. dbxread) figure out which object is the
1229 entry file is somewhat hokey. */
1230 /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
1231 then it should probably be moved to before the ->prev_p test,
1233 if (inside_entry_file (get_frame_pc (next_frame
)))
1236 /* If any of the old frame initialization methods are around, use
1237 the legacy get_prev_frame method. Just don't try to unwind a
1238 sentinel frame using that method - it doesn't work. All sentinal
1239 frames use the new unwind code. */
1240 if ((DEPRECATED_INIT_FRAME_PC_P ()
1241 || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
1242 || INIT_EXTRA_FRAME_INFO_P ()
1243 || FRAME_CHAIN_P ())
1244 && next_frame
->level
>= 0)
1245 return legacy_get_prev_frame (next_frame
);
1247 /* Allocate the new frame but do not wire it in to the frame chain.
1248 Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
1249 frame->next to pull some fancy tricks (of course such code is, by
1250 definition, recursive). Try to prevent it.
1252 There is no reason to worry about memory leaks, should the
1253 remainder of the function fail. The allocated memory will be
1254 quickly reclaimed when the frame cache is flushed, and the `we've
1255 been here before' check above will stop repeated memory
1256 allocation calls. */
1257 prev_frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1258 prev_frame
->level
= next_frame
->level
+ 1;
1260 /* Try to unwind the PC. If that doesn't work, assume we've reached
1261 the oldest frame and simply return. Is there a better sentinal
1262 value? The unwound PC value is then used to initialize the new
1263 previous frame's type.
1265 Note that the pc-unwind is intentionally performed before the
1266 frame chain. This is ok since, for old targets, both
1267 frame_pc_unwind (nee, FRAME_SAVED_PC) and FRAME_CHAIN()) assume
1268 NEXT_FRAME's data structures have already been initialized (using
1269 INIT_EXTRA_FRAME_INFO) and hence the call order doesn't matter.
1271 By unwinding the PC first, it becomes possible to, in the case of
1272 a dummy frame, avoid also unwinding the frame ID. This is
1273 because (well ignoring the PPC) a dummy frame can be located
1274 using NEXT_FRAME's frame ID. */
1276 prev_frame
->pc
= frame_pc_unwind (next_frame
);
1277 if (prev_frame
->pc
== 0)
1278 /* The allocated PREV_FRAME will be reclaimed when the frame
1279 obstack is next purged. */
1281 prev_frame
->type
= frame_type_from_pc (prev_frame
->pc
);
1283 /* Set the unwind functions based on that identified PC. */
1284 prev_frame
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
1287 /* FIXME: cagney/2003-01-13: A dummy frame doesn't need to unwind
1288 the frame ID because the frame ID comes from the previous frame.
1289 The other frames do though. True? */
1291 /* FIXME: cagney/2002-12-18: Instead of this hack, should just
1292 save the frame ID directly. */
1293 struct frame_id id
= frame_id_unwind (next_frame
);
1294 if (!frame_id_p (id
))
1296 prev_frame
->frame
= id
.base
;
1300 next_frame
->prev
= prev_frame
;
1301 prev_frame
->next
= next_frame
;
1303 /* FIXME: cagney/2002-01-19: This call will go away. Instead of
1304 initializing extra info, all frames will use the frame_cache
1305 (passed to the unwind functions) to store additional frame info.
1306 Unfortunatly legacy targets can't use legacy_get_prev_frame() to
1307 unwind the sentinel frame and, consequently, are forced to take
1308 this code path and rely on the below call to INIT_EXTR_FRAME_INFO
1309 to initialize the inner-most frame. */
1310 if (INIT_EXTRA_FRAME_INFO_P ())
1312 gdb_assert (prev_frame
->level
== 0);
1313 INIT_EXTRA_FRAME_INFO (0, prev_frame
);
1320 get_frame_pc (struct frame_info
*frame
)
1326 pc_notcurrent (struct frame_info
*frame
)
1328 /* If FRAME is not the innermost frame, that normally means that
1329 FRAME->pc points at the return instruction (which is *after* the
1330 call instruction), and we want to get the line containing the
1331 call (because the call is where the user thinks the program is).
1332 However, if the next frame is either a SIGTRAMP_FRAME or a
1333 DUMMY_FRAME, then the next frame will contain a saved interrupt
1334 PC and such a PC indicates the current (rather than next)
1335 instruction/line, consequently, for such cases, want to get the
1336 line containing fi->pc. */
1337 struct frame_info
*next
= get_next_frame (frame
);
1338 int notcurrent
= (next
!= NULL
&& get_frame_type (next
) == NORMAL_FRAME
);
1343 find_frame_sal (struct frame_info
*frame
, struct symtab_and_line
*sal
)
1345 (*sal
) = find_pc_line (frame
->pc
, pc_notcurrent (frame
));
1348 /* Per "frame.h", return the ``address'' of the frame. Code should
1349 really be using get_frame_id(). */
1351 get_frame_base (struct frame_info
*fi
)
1356 /* Level of the selected frame: 0 for innermost, 1 for its caller, ...
1357 or -1 for a NULL frame. */
1360 frame_relative_level (struct frame_info
*fi
)
1369 get_frame_type (struct frame_info
*frame
)
1371 /* Some targets still don't use [generic] dummy frames. Catch them
1373 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1374 && deprecated_frame_in_dummy (frame
))
1380 deprecated_set_frame_type (struct frame_info
*frame
, enum frame_type type
)
1382 /* Arrrg! See comment in "frame.h". */
1386 #ifdef FRAME_FIND_SAVED_REGS
1387 /* XXX - deprecated. This is a compatibility function for targets
1388 that do not yet implement FRAME_INIT_SAVED_REGS. */
1389 /* Find the addresses in which registers are saved in FRAME. */
1392 deprecated_get_frame_saved_regs (struct frame_info
*frame
,
1393 struct frame_saved_regs
*saved_regs_addr
)
1395 if (frame
->saved_regs
== NULL
)
1397 frame
->saved_regs
= (CORE_ADDR
*)
1398 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
1400 if (saved_regs_addr
== NULL
)
1402 struct frame_saved_regs saved_regs
;
1403 FRAME_FIND_SAVED_REGS (frame
, saved_regs
);
1404 memcpy (frame
->saved_regs
, &saved_regs
, SIZEOF_FRAME_SAVED_REGS
);
1408 FRAME_FIND_SAVED_REGS (frame
, *saved_regs_addr
);
1409 memcpy (frame
->saved_regs
, saved_regs_addr
, SIZEOF_FRAME_SAVED_REGS
);
1414 struct frame_extra_info
*
1415 get_frame_extra_info (struct frame_info
*fi
)
1417 return fi
->extra_info
;
1420 struct frame_extra_info
*
1421 frame_extra_info_zalloc (struct frame_info
*fi
, long size
)
1423 fi
->extra_info
= frame_obstack_zalloc (size
);
1424 return fi
->extra_info
;
1428 deprecated_update_frame_pc_hack (struct frame_info
*frame
, CORE_ADDR pc
)
1430 /* See comment in "frame.h". */
1431 gdb_assert (frame
->next
!= NULL
);
1436 deprecated_update_frame_base_hack (struct frame_info
*frame
, CORE_ADDR base
)
1438 /* See comment in "frame.h". */
1439 frame
->frame
= base
;
1443 deprecated_set_frame_saved_regs_hack (struct frame_info
*frame
,
1444 CORE_ADDR
*saved_regs
)
1446 frame
->saved_regs
= saved_regs
;
1450 deprecated_set_frame_extra_info_hack (struct frame_info
*frame
,
1451 struct frame_extra_info
*extra_info
)
1453 frame
->extra_info
= extra_info
;
1457 deprecated_set_frame_next_hack (struct frame_info
*fi
,
1458 struct frame_info
*next
)
1464 deprecated_set_frame_prev_hack (struct frame_info
*fi
,
1465 struct frame_info
*prev
)
1471 deprecated_get_frame_context (struct frame_info
*fi
)
1477 deprecated_set_frame_context (struct frame_info
*fi
,
1478 struct context
*context
)
1480 fi
->context
= context
;
1484 deprecated_frame_xmalloc (void)
1486 struct frame_info
*frame
= XMALLOC (struct frame_info
);
1487 memset (frame
, 0, sizeof (struct frame_info
));
1492 deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs
,
1493 long sizeof_extra_info
)
1495 struct frame_info
*frame
= deprecated_frame_xmalloc ();
1496 make_cleanup (xfree
, frame
);
1497 if (sizeof_saved_regs
> 0)
1499 frame
->saved_regs
= xcalloc (1, sizeof_saved_regs
);
1500 make_cleanup (xfree
, frame
->saved_regs
);
1502 if (sizeof_extra_info
> 0)
1504 frame
->extra_info
= xcalloc (1, sizeof_extra_info
);
1505 make_cleanup (xfree
, frame
->extra_info
);
1511 _initialize_frame (void)
1513 obstack_init (&frame_cache_obstack
);
1515 /* FIXME: cagney/2003-01-19: This command needs a rename. Suggest
1516 `set backtrace {past,beyond,...}-main'. Also suggest adding `set
1517 backtrace ...-start' to control backtraces past start. The
1518 problem with `below' is that it stops the `up' command. */
1520 add_setshow_boolean_cmd ("backtrace-below-main", class_obscure
,
1521 &backtrace_below_main
, "\
1522 Set whether backtraces should continue past \"main\".\n\
1523 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
1524 the backtrace at \"main\". Set this variable if you need to see the rest\n\
1525 of the stack trace.", "\
1526 Show whether backtraces should continue past \"main\".\n\
1527 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
1528 the backtrace at \"main\". Set this variable if you need to see the rest\n\
1529 of the stack trace.",
1530 NULL
, NULL
, &setlist
, &showlist
);