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 /* We keep a cache of stack frames, each of which is a "struct
44 frame_info". The innermost one gets allocated (in
45 wait_for_inferior) each time the inferior stops; current_frame
46 points to it. Additional frames get allocated (in get_prev_frame)
47 as needed, and are chained through the next and prev fields. Any
48 time that the frame cache becomes invalid (most notably when we
49 execute something, but also if we change how we interpret the
50 frames (e.g. "set heuristic-fence-post" in mips-tdep.c, or anything
51 which reads new symbols)), we should call reinit_frame_cache. */
55 /* Level of this frame. The inner-most (youngest) frame is at level
56 0. As you move towards the outer-most (oldest) frame, the level
57 increases. This is a cached value. It could just as easily be
58 computed by counting back from the selected frame to the inner
60 /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be
61 reserved to indicate a bogus frame - one that has been created
62 just to keep GDB happy (GDB always needs a frame). For the
63 moment leave this as speculation. */
66 /* The frame's type. */
67 /* FIXME: cagney/2003-04-02: Should instead be returning
68 ->unwind->type. Unfortunatly, legacy code is still explicitly
69 setting the type using the method deprecated_set_frame_type.
70 Eliminate that method and this field can be eliminated. */
73 /* For each register, address of where it was saved on entry to the
74 frame, or zero if it was not saved on entry to this frame. This
75 includes special registers such as pc and fp saved in special
76 ways in the stack frame. The SP_REGNUM is even more special, the
77 address here is the sp for the previous frame, not the address
78 where the sp was saved. */
79 /* Allocated by frame_saved_regs_zalloc () which is called /
80 initialized by DEPRECATED_FRAME_INIT_SAVED_REGS(). */
81 CORE_ADDR
*saved_regs
; /*NUM_REGS + NUM_PSEUDO_REGS*/
83 /* Anything extra for this structure that may have been defined in
84 the machine dependent files. */
85 /* Allocated by frame_extra_info_zalloc () which is called /
86 initialized by DEPRECATED_INIT_EXTRA_FRAME_INFO */
87 struct frame_extra_info
*extra_info
;
89 /* If dwarf2 unwind frame informations is used, this structure holds
90 all related unwind data. */
91 struct context
*context
;
93 /* The frame's low-level unwinder and corresponding cache. The
94 low-level unwinder is responsible for unwinding register values
95 for the previous frame. The low-level unwind methods are
96 selected based on the presence, or otherwize, of register unwind
97 information such as CFI. */
99 const struct frame_unwind
*unwind
;
101 /* Cached copy of the previous frame's resume address. */
107 /* Cached copy of the previous frame's function address. */
114 /* This frame's ID. */
118 struct frame_id value
;
121 /* The frame's high-level base methods, and corresponding cache.
122 The high level base methods are selected based on the frame's
124 const struct frame_base
*base
;
127 /* Pointers to the next (down, inner, younger) and previous (up,
128 outer, older) frame_info's in the frame cache. */
129 struct frame_info
*next
; /* down, inner, younger */
131 struct frame_info
*prev
; /* up, outer, older */
134 /* Flag to control debugging. */
136 static int frame_debug
;
138 /* Flag to indicate whether backtraces should stop at main. */
140 static int backtrace_below_main
;
143 fprint_frame_id (struct ui_file
*file
, struct frame_id id
)
145 fprintf_unfiltered (file
, "{stack=0x%s,code=0x%s}",
146 paddr_nz (id
.stack_addr
),
147 paddr_nz (id
.code_addr
));
151 fprint_frame_type (struct ui_file
*file
, enum frame_type type
)
156 fprintf_unfiltered (file
, "UNKNOWN_FRAME");
159 fprintf_unfiltered (file
, "NORMAL_FRAME");
162 fprintf_unfiltered (file
, "DUMMY_FRAME");
165 fprintf_unfiltered (file
, "SIGTRAMP_FRAME");
168 fprintf_unfiltered (file
, "<unknown type>");
174 fprint_frame (struct ui_file
*file
, struct frame_info
*fi
)
178 fprintf_unfiltered (file
, "<NULL frame>");
181 fprintf_unfiltered (file
, "{");
182 fprintf_unfiltered (file
, "level=%d", fi
->level
);
183 fprintf_unfiltered (file
, ",");
184 fprintf_unfiltered (file
, "type=");
185 fprint_frame_type (file
, fi
->type
);
186 fprintf_unfiltered (file
, ",");
187 fprintf_unfiltered (file
, "unwind=");
188 if (fi
->unwind
!= NULL
)
189 gdb_print_host_address (fi
->unwind
, file
);
191 fprintf_unfiltered (file
, "<unknown>");
192 fprintf_unfiltered (file
, ",");
193 fprintf_unfiltered (file
, "pc=");
194 if (fi
->next
!= NULL
&& fi
->next
->prev_pc
.p
)
195 fprintf_unfiltered (file
, "0x%s", paddr_nz (fi
->next
->prev_pc
.value
));
197 fprintf_unfiltered (file
, "<unknown>");
198 fprintf_unfiltered (file
, ",");
199 fprintf_unfiltered (file
, "id=");
201 fprint_frame_id (file
, fi
->this_id
.value
);
203 fprintf_unfiltered (file
, "<unknown>");
204 fprintf_unfiltered (file
, ",");
205 fprintf_unfiltered (file
, "func=");
206 if (fi
->next
!= NULL
&& fi
->next
->prev_func
.p
)
207 fprintf_unfiltered (file
, "0x%s", paddr_nz (fi
->next
->prev_func
.addr
));
209 fprintf_unfiltered (file
, "<unknown>");
210 fprintf_unfiltered (file
, "}");
213 /* Return a frame uniq ID that can be used to, later, re-find the
217 get_frame_id (struct frame_info
*fi
)
221 return null_frame_id
;
225 gdb_assert (!legacy_frame_p (current_gdbarch
));
227 fprintf_unfiltered (gdb_stdlog
, "{ get_frame_id (fi=%d) ",
229 /* Find the unwinder. */
230 if (fi
->unwind
== NULL
)
232 fi
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
234 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
235 type in the frame, the unwinder's type should be returned
236 directly. Unfortunatly, legacy code, called by
237 legacy_get_prev_frame, explicitly set the frames type
238 using the method deprecated_set_frame_type(). */
239 gdb_assert (fi
->unwind
->type
!= UNKNOWN_FRAME
);
240 fi
->type
= fi
->unwind
->type
;
242 /* Find THIS frame's ID. */
243 fi
->unwind
->this_id (fi
->next
, &fi
->prologue_cache
, &fi
->this_id
.value
);
247 fprintf_unfiltered (gdb_stdlog
, "-> ");
248 fprint_frame_id (gdb_stdlog
, fi
->this_id
.value
);
249 fprintf_unfiltered (gdb_stdlog
, " }\n");
252 return fi
->this_id
.value
;
255 const struct frame_id null_frame_id
; /* All zeros. */
258 frame_id_build (CORE_ADDR stack_addr
, CORE_ADDR code_addr
)
261 id
.stack_addr
= stack_addr
;
262 id
.code_addr
= code_addr
;
267 frame_id_p (struct frame_id l
)
270 /* The .code can be NULL but the .stack cannot. */
271 p
= (l
.stack_addr
!= 0);
274 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_p (l=");
275 fprint_frame_id (gdb_stdlog
, l
);
276 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", p
);
282 frame_id_eq (struct frame_id l
, struct frame_id r
)
285 if (l
.stack_addr
== 0 || r
.stack_addr
== 0)
286 /* Like a NaN, if either ID is invalid, the result is false. */
288 else if (l
.stack_addr
!= r
.stack_addr
)
289 /* If .stack addresses are different, the frames are different. */
291 else if (l
.code_addr
== 0 || r
.code_addr
== 0)
292 /* A zero code addr is a wild card, always succeed. */
294 else if (l
.code_addr
== r
.code_addr
)
295 /* The .stack and .code are identical, the ID's are identical. */
298 /* FIXME: cagney/2003-04-06: This should be zero. Can't yet do
299 this because most frame ID's are not being initialized
304 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_eq (l=");
305 fprint_frame_id (gdb_stdlog
, l
);
306 fprintf_unfiltered (gdb_stdlog
, ",r=");
307 fprint_frame_id (gdb_stdlog
, r
);
308 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", eq
);
314 frame_id_inner (struct frame_id l
, struct frame_id r
)
317 if (l
.stack_addr
== 0 || r
.stack_addr
== 0)
318 /* Like NaN, any operation involving an invalid ID always fails. */
321 /* Only return non-zero when strictly inner than. Note that, per
322 comment in "frame.h", there is some fuzz here. Frameless
323 functions are not strictly inner than (same .stack but
325 inner
= INNER_THAN (l
.stack_addr
, r
.stack_addr
);
328 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_inner (l=");
329 fprint_frame_id (gdb_stdlog
, l
);
330 fprintf_unfiltered (gdb_stdlog
, ",r=");
331 fprint_frame_id (gdb_stdlog
, r
);
332 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", inner
);
338 frame_find_by_id (struct frame_id id
)
340 struct frame_info
*frame
;
342 /* ZERO denotes the null frame, let the caller decide what to do
343 about it. Should it instead return get_current_frame()? */
344 if (!frame_id_p (id
))
347 for (frame
= get_current_frame ();
349 frame
= get_prev_frame (frame
))
351 struct frame_id
this = get_frame_id (frame
);
352 if (frame_id_eq (id
, this))
353 /* An exact match. */
355 if (frame_id_inner (id
, this))
358 /* Either, we're not yet gone far enough out along the frame
359 chain (inner(this,id), or we're comparing frameless functions
360 (same .base, different .func, no test available). Struggle
361 on until we've definitly gone to far. */
367 frame_pc_unwind (struct frame_info
*this_frame
)
369 if (!this_frame
->prev_pc
.p
)
372 if (gdbarch_unwind_pc_p (current_gdbarch
))
374 /* The right way. The `pure' way. The one true way. This
375 method depends solely on the register-unwind code to
376 determine the value of registers in THIS frame, and hence
377 the value of this frame's PC (resume address). A typical
378 implementation is no more than:
380 frame_unwind_register (this_frame, ISA_PC_REGNUM, buf);
381 return extract_address (buf, size of ISA_PC_REGNUM);
383 Note: this method is very heavily dependent on a correct
384 register-unwind implementation, it pays to fix that
385 method first; this method is frame type agnostic, since
386 it only deals with register values, it works with any
387 frame. This is all in stark contrast to the old
388 FRAME_SAVED_PC which would try to directly handle all the
389 different ways that a PC could be unwound. */
390 pc
= gdbarch_unwind_pc (current_gdbarch
, this_frame
);
392 else if (this_frame
->level
< 0)
394 /* FIXME: cagney/2003-03-06: Old code and and a sentinel
395 frame. Do like was always done. Fetch the PC's value
396 direct from the global registers array (via read_pc).
397 This assumes that this frame belongs to the current
398 global register cache. The assumption is dangerous. */
401 else if (DEPRECATED_FRAME_SAVED_PC_P ())
403 /* FIXME: cagney/2003-03-06: Old code, but not a sentinel
404 frame. Do like was always done. Note that this method,
405 unlike unwind_pc(), tries to handle all the different
406 frame cases directly. It fails. */
407 pc
= DEPRECATED_FRAME_SAVED_PC (this_frame
);
410 internal_error (__FILE__
, __LINE__
, "No gdbarch_unwind_pc method");
411 this_frame
->prev_pc
.value
= pc
;
412 this_frame
->prev_pc
.p
= 1;
414 fprintf_unfiltered (gdb_stdlog
,
415 "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n",
417 paddr_nz (this_frame
->prev_pc
.value
));
419 return this_frame
->prev_pc
.value
;
423 frame_func_unwind (struct frame_info
*fi
)
425 if (!fi
->prev_func
.p
)
428 fi
->prev_func
.addr
= get_pc_function_start (frame_pc_unwind (fi
));
430 fprintf_unfiltered (gdb_stdlog
,
431 "{ frame_func_unwind (fi=%d) -> 0x%s }\n",
432 fi
->level
, paddr_nz (fi
->prev_func
.addr
));
434 return fi
->prev_func
.addr
;
438 get_frame_func (struct frame_info
*fi
)
440 return frame_func_unwind (fi
->next
);
444 do_frame_unwind_register (void *src
, int regnum
, void *buf
)
446 frame_unwind_register (src
, regnum
, buf
);
451 frame_pop (struct frame_info
*this_frame
)
453 struct regcache
*scratch_regcache
;
454 struct cleanup
*cleanups
;
456 if (DEPRECATED_POP_FRAME_P ())
458 /* A legacy architecture that has implemented a custom pop
459 function. All new architectures should instead be using the
460 generic code below. */
461 DEPRECATED_POP_FRAME
;
465 /* Make a copy of all the register values unwound from this
466 frame. Save them in a scratch buffer so that there isn't a
467 race betweening trying to extract the old values from the
468 current_regcache while, at the same time writing new values
469 into that same cache. */
470 struct regcache
*scratch
= regcache_xmalloc (current_gdbarch
);
471 struct cleanup
*cleanups
= make_cleanup_regcache_xfree (scratch
);
472 regcache_save (scratch
, do_frame_unwind_register
, this_frame
);
473 /* FIXME: cagney/2003-03-16: It should be possible to tell the
474 target's register cache that it is about to be hit with a
475 burst register transfer and that the sequence of register
476 writes should be batched. The pair target_prepare_to_store()
477 and target_store_registers() kind of suggest this
478 functionality. Unfortunatly, they don't implement it. Their
479 lack of a formal definition can lead to targets writing back
480 bogus values (arguably a bug in the target code mind). */
481 /* Now copy those saved registers into the current regcache.
482 Here, regcache_cpy() calls regcache_restore(). */
483 regcache_cpy (current_regcache
, scratch
);
484 do_cleanups (cleanups
);
486 /* We've made right mess of GDB's local state, just discard
488 flush_cached_frames ();
492 frame_register_unwind (struct frame_info
*frame
, int regnum
,
493 int *optimizedp
, enum lval_type
*lvalp
,
494 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
496 struct frame_unwind_cache
*cache
;
500 fprintf_unfiltered (gdb_stdlog
,
501 "{ frame_register_unwind (frame=%d,regnum=\"%s\",...) ",
502 frame
->level
, frame_map_regnum_to_name (regnum
));
505 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
506 that the value proper does not need to be fetched. */
507 gdb_assert (optimizedp
!= NULL
);
508 gdb_assert (lvalp
!= NULL
);
509 gdb_assert (addrp
!= NULL
);
510 gdb_assert (realnump
!= NULL
);
511 /* gdb_assert (bufferp != NULL); */
513 /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame
514 is broken. There is always a frame. If there, for some reason,
515 isn't, there is some pretty busted code as it should have
516 detected the problem before calling here. */
517 gdb_assert (frame
!= NULL
);
519 /* Find the unwinder. */
520 if (frame
->unwind
== NULL
)
522 frame
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
523 get_frame_pc (frame
));
524 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
525 type in the frame, the unwinder's type should be returned
526 directly. Unfortunatly, legacy code, called by
527 legacy_get_prev_frame, explicitly set the frames type using
528 the method deprecated_set_frame_type(). */
529 gdb_assert (frame
->unwind
->type
!= UNKNOWN_FRAME
);
530 frame
->type
= frame
->unwind
->type
;
533 /* Ask this frame to unwind its register. See comment in
534 "frame-unwind.h" for why NEXT frame and this unwind cace are
536 frame
->unwind
->prev_register (frame
->next
, &frame
->prologue_cache
, regnum
,
537 optimizedp
, lvalp
, addrp
, realnump
, bufferp
);
541 fprintf_unfiltered (gdb_stdlog
, "->");
542 fprintf_unfiltered (gdb_stdlog
, " *optimizedp=%d", (*optimizedp
));
543 fprintf_unfiltered (gdb_stdlog
, " *lvalp=%d", (int) (*lvalp
));
544 fprintf_unfiltered (gdb_stdlog
, " *addrp=0x%s", paddr_nz ((*addrp
)));
545 fprintf_unfiltered (gdb_stdlog
, " *bufferp=");
547 fprintf_unfiltered (gdb_stdlog
, "<NULL>");
551 const char *buf
= bufferp
;
552 fprintf_unfiltered (gdb_stdlog
, "[");
553 for (i
= 0; i
< register_size (current_gdbarch
, regnum
); i
++)
554 fprintf_unfiltered (gdb_stdlog
, "%02x", buf
[i
]);
555 fprintf_unfiltered (gdb_stdlog
, "]");
557 fprintf_unfiltered (gdb_stdlog
, " }\n");
562 frame_register (struct frame_info
*frame
, int regnum
,
563 int *optimizedp
, enum lval_type
*lvalp
,
564 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
566 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
567 that the value proper does not need to be fetched. */
568 gdb_assert (optimizedp
!= NULL
);
569 gdb_assert (lvalp
!= NULL
);
570 gdb_assert (addrp
!= NULL
);
571 gdb_assert (realnump
!= NULL
);
572 /* gdb_assert (bufferp != NULL); */
574 /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
575 of the register in the register cache. It should instead return
576 the REGNUM corresponding to that register. Translate the . */
577 if (DEPRECATED_GET_SAVED_REGISTER_P ())
579 DEPRECATED_GET_SAVED_REGISTER (bufferp
, optimizedp
, addrp
, frame
,
581 /* Compute the REALNUM if the caller wants it. */
582 if (*lvalp
== lval_register
)
585 for (regnum
= 0; regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
; regnum
++)
587 if (*addrp
== register_offset_hack (current_gdbarch
, regnum
))
593 internal_error (__FILE__
, __LINE__
,
594 "Failed to compute the register number corresponding"
595 " to 0x%s", paddr_d (*addrp
));
601 /* Obtain the register value by unwinding the register from the next
602 (more inner frame). */
603 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
604 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
609 frame_unwind_register (struct frame_info
*frame
, int regnum
, void *buf
)
615 frame_register_unwind (frame
, regnum
, &optimized
, &lval
, &addr
,
620 frame_unwind_signed_register (struct frame_info
*frame
, int regnum
,
623 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
624 frame_unwind_register (frame
, regnum
, buf
);
625 (*val
) = extract_signed_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
629 frame_unwind_unsigned_register (struct frame_info
*frame
, int regnum
,
632 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
633 frame_unwind_register (frame
, regnum
, buf
);
634 (*val
) = extract_unsigned_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
638 frame_read_register (struct frame_info
*frame
, int regnum
, void *buf
)
640 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
641 frame_unwind_register (frame
->next
, regnum
, buf
);
645 frame_read_unsigned_register (struct frame_info
*frame
, int regnum
,
648 /* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is
649 always a frame. Both this, and the equivalent
650 frame_read_signed_register() function, can only be called with a
651 valid frame. If, for some reason, this function is called
652 without a frame then the problem isn't here, but rather in the
653 caller. It should of first created a frame and then passed that
655 /* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the
656 ``current_frame'' should not be treated as a special case. While
657 ``get_next_frame (current_frame) == NULL'' currently holds, it
658 should, as far as possible, not be relied upon. In the future,
659 ``get_next_frame (current_frame)'' may instead simply return a
660 normal frame object that simply always gets register values from
661 the register cache. Consequently, frame code should try to avoid
662 tests like ``if get_next_frame() == NULL'' and instead just rely
663 on recursive frame calls (like the below code) when manipulating
665 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
666 frame_unwind_unsigned_register (frame
->next
, regnum
, val
);
670 frame_read_signed_register (struct frame_info
*frame
, int regnum
,
673 /* See note above in frame_read_unsigned_register(). */
674 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
675 frame_unwind_signed_register (frame
->next
, regnum
, val
);
679 generic_unwind_get_saved_register (char *raw_buffer
,
682 struct frame_info
*frame
,
684 enum lval_type
*lvalp
)
689 enum lval_type lvalx
;
691 if (!target_has_registers
)
692 error ("No registers.");
694 /* Keep things simple, ensure that all the pointers (except valuep)
696 if (optimizedp
== NULL
)
697 optimizedp
= &optimizedx
;
703 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
704 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
705 &realnumx
, raw_buffer
);
708 /* frame_register_read ()
710 Find and return the value of REGNUM for the specified stack frame.
711 The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
713 Returns 0 if the register value could not be found. */
716 frame_register_read (struct frame_info
*frame
, int regnum
, void *myaddr
)
722 frame_register (frame
, regnum
, &optimized
, &lval
, &addr
, &realnum
, myaddr
);
724 /* FIXME: cagney/2002-05-15: This test, is just bogus.
726 It indicates that the target failed to supply a value for a
727 register because it was "not available" at this time. Problem
728 is, the target still has the register and so get saved_register()
729 may be returning a value saved on the stack. */
731 if (register_cached (regnum
) < 0)
732 return 0; /* register value not available */
738 /* Map between a frame register number and its name. A frame register
739 space is a superset of the cooked register space --- it also
740 includes builtin registers. */
743 frame_map_name_to_regnum (const char *name
, int len
)
750 /* Search register name space. */
751 for (i
= 0; i
< NUM_REGS
+ NUM_PSEUDO_REGS
; i
++)
752 if (REGISTER_NAME (i
) && len
== strlen (REGISTER_NAME (i
))
753 && strncmp (name
, REGISTER_NAME (i
), len
) == 0)
758 /* Try builtin registers. */
759 i
= builtin_reg_map_name_to_regnum (name
, len
);
762 /* A builtin register doesn't fall into the architecture's
764 gdb_assert (i
>= NUM_REGS
+ NUM_PSEUDO_REGS
);
772 frame_map_regnum_to_name (int regnum
)
776 if (regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
)
777 return REGISTER_NAME (regnum
);
778 return builtin_reg_map_regnum_to_name (regnum
);
781 /* Create a sentinel frame. */
784 create_sentinel_frame (struct regcache
*regcache
)
786 struct frame_info
*frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
787 frame
->type
= NORMAL_FRAME
;
789 /* Explicitly initialize the sentinel frame's cache. Provide it
790 with the underlying regcache. In the future additional
791 information, such as the frame's thread will be added. */
792 frame
->prologue_cache
= sentinel_frame_cache (regcache
);
793 /* For the moment there is only one sentinel frame implementation. */
794 frame
->unwind
= sentinel_frame_unwind
;
795 /* Link this frame back to itself. The frame is self referential
796 (the unwound PC is the same as the pc), so make it so. */
798 /* Make the sentinel frame's ID valid, but invalid. That way all
799 comparisons with it should fail. */
800 frame
->this_id
.p
= 1;
801 frame
->this_id
.value
= null_frame_id
;
804 fprintf_unfiltered (gdb_stdlog
, "{ create_sentinel_frame (...) -> ");
805 fprint_frame (gdb_stdlog
, frame
);
806 fprintf_unfiltered (gdb_stdlog
, " }\n");
811 /* Info about the innermost stack frame (contents of FP register) */
813 static struct frame_info
*current_frame
;
815 /* Cache for frame addresses already read by gdb. Valid only while
816 inferior is stopped. Control variables for the frame cache should
817 be local to this module. */
819 static struct obstack frame_cache_obstack
;
822 frame_obstack_zalloc (unsigned long size
)
824 void *data
= obstack_alloc (&frame_cache_obstack
, size
);
825 memset (data
, 0, size
);
830 frame_saved_regs_zalloc (struct frame_info
*fi
)
832 fi
->saved_regs
= (CORE_ADDR
*)
833 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
834 return fi
->saved_regs
;
838 get_frame_saved_regs (struct frame_info
*fi
)
840 return fi
->saved_regs
;
843 /* Return the innermost (currently executing) stack frame. This is
844 split into two functions. The function unwind_to_current_frame()
845 is wrapped in catch exceptions so that, even when the unwind of the
846 sentinel frame fails, the function still returns a stack frame. */
849 unwind_to_current_frame (struct ui_out
*ui_out
, void *args
)
851 struct frame_info
*frame
= get_prev_frame (args
);
852 /* A sentinel frame can fail to unwind, eg, because it's PC value
853 lands in somewhere like start. */
856 current_frame
= frame
;
861 get_current_frame (void)
863 /* First check, and report, the lack of registers. Having GDB
864 report "No stack!" or "No memory" when the target doesn't even
865 have registers is very confusing. Besides, "printcmd.exp"
866 explicitly checks that ``print $pc'' with no registers prints "No
868 if (!target_has_registers
)
869 error ("No registers.");
870 if (!target_has_stack
)
872 if (!target_has_memory
)
873 error ("No memory.");
874 if (current_frame
== NULL
)
876 struct frame_info
*sentinel_frame
=
877 create_sentinel_frame (current_regcache
);
878 if (catch_exceptions (uiout
, unwind_to_current_frame
, sentinel_frame
,
879 NULL
, RETURN_MASK_ERROR
) != 0)
881 /* Oops! Fake a current frame? Is this useful? It has a PC
882 of zero, for instance. */
883 current_frame
= sentinel_frame
;
886 return current_frame
;
889 /* The "selected" stack frame is used by default for local and arg
890 access. May be zero, for no selected frame. */
892 struct frame_info
*deprecated_selected_frame
;
894 /* Return the selected frame. Always non-null (unless there isn't an
895 inferior sufficient for creating a frame) in which case an error is
899 get_selected_frame (void)
901 if (deprecated_selected_frame
== NULL
)
902 /* Hey! Don't trust this. It should really be re-finding the
903 last selected frame of the currently selected thread. This,
904 though, is better than nothing. */
905 select_frame (get_current_frame ());
906 /* There is always a frame. */
907 gdb_assert (deprecated_selected_frame
!= NULL
);
908 return deprecated_selected_frame
;
911 /* Select frame FI (or NULL - to invalidate the current frame). */
914 select_frame (struct frame_info
*fi
)
916 register struct symtab
*s
;
918 deprecated_selected_frame
= fi
;
919 /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
920 frame is being invalidated. */
921 if (selected_frame_level_changed_hook
)
922 selected_frame_level_changed_hook (frame_relative_level (fi
));
924 /* FIXME: kseitz/2002-08-28: It would be nice to call
925 selected_frame_level_changed_event right here, but due to limitations
926 in the current interfaces, we would end up flooding UIs with events
927 because select_frame is used extensively internally.
929 Once we have frame-parameterized frame (and frame-related) commands,
930 the event notification can be moved here, since this function will only
931 be called when the users selected frame is being changed. */
933 /* Ensure that symbols for this frame are read in. Also, determine the
934 source language of this frame, and switch to it if desired. */
937 s
= find_pc_symtab (get_frame_pc (fi
));
939 && s
->language
!= current_language
->la_language
940 && s
->language
!= language_unknown
941 && language_mode
== language_mode_auto
)
943 set_language (s
->language
);
948 /* Return the register saved in the simplistic ``saved_regs'' cache.
949 If the value isn't here AND a value is needed, try the next inner
953 legacy_saved_regs_prev_register (struct frame_info
*next_frame
,
954 void **this_prologue_cache
,
955 int regnum
, int *optimizedp
,
956 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
957 int *realnump
, void *bufferp
)
959 /* HACK: New code is passed the next frame and this cache.
960 Unfortunatly, old code expects this frame. Since this is a
961 backward compatibility hack, cheat by walking one level along the
962 prologue chain to the frame the old code expects.
964 Do not try this at home. Professional driver, closed course. */
965 struct frame_info
*frame
= next_frame
->prev
;
966 gdb_assert (frame
!= NULL
);
968 /* Only (older) architectures that implement the
969 DEPRECATED_FRAME_INIT_SAVED_REGS method should be using this
971 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
973 /* Load the saved_regs register cache. */
974 if (get_frame_saved_regs (frame
) == NULL
)
975 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
977 if (get_frame_saved_regs (frame
) != NULL
978 && get_frame_saved_regs (frame
)[regnum
] != 0)
980 if (regnum
== SP_REGNUM
)
982 /* SP register treated specially. */
988 store_address (bufferp
, REGISTER_RAW_SIZE (regnum
),
989 get_frame_saved_regs (frame
)[regnum
]);
993 /* Any other register is saved in memory, fetch it but cache
994 a local copy of its value. */
996 *lvalp
= lval_memory
;
997 *addrp
= get_frame_saved_regs (frame
)[regnum
];
1002 /* Save each register value, as it is read in, in a
1003 frame based cache. */
1004 void **regs
= (*this_prologue_cache
);
1007 int sizeof_cache
= ((NUM_REGS
+ NUM_PSEUDO_REGS
)
1009 regs
= frame_obstack_zalloc (sizeof_cache
);
1010 (*this_prologue_cache
) = regs
;
1012 if (regs
[regnum
] == NULL
)
1015 = frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum
));
1016 read_memory (get_frame_saved_regs (frame
)[regnum
], regs
[regnum
],
1017 REGISTER_RAW_SIZE (regnum
));
1019 memcpy (bufferp
, regs
[regnum
], REGISTER_RAW_SIZE (regnum
));
1021 /* Read the value in from memory. */
1022 read_memory (get_frame_saved_regs (frame
)[regnum
], bufferp
,
1023 REGISTER_RAW_SIZE (regnum
));
1030 /* No luck. Assume this and the next frame have the same register
1031 value. Pass the unwind request down the frame chain to the next
1032 frame. Hopefully that frame will find the register's location. */
1033 frame_register_unwind (next_frame
, regnum
, optimizedp
, lvalp
, addrp
,
1038 legacy_saved_regs_this_id (struct frame_info
*next_frame
,
1039 void **this_prologue_cache
,
1040 struct frame_id
*id
)
1042 /* legacy_get_prev_frame() always sets ->this_id.p, hence this is
1044 internal_error (__FILE__
, __LINE__
, "legacy_saved_regs_this_id() called");
1047 const struct frame_unwind legacy_saved_regs_unwinder
= {
1048 /* Not really. It gets overridden by legacy_get_prev_frame. */
1050 legacy_saved_regs_this_id
,
1051 legacy_saved_regs_prev_register
1053 const struct frame_unwind
*legacy_saved_regs_unwind
= &legacy_saved_regs_unwinder
;
1056 /* Function: deprecated_generic_get_saved_register
1057 Find register number REGNUM relative to FRAME and put its (raw,
1058 target format) contents in *RAW_BUFFER.
1060 Set *OPTIMIZED if the variable was optimized out (and thus can't be
1061 fetched). Note that this is never set to anything other than zero
1062 in this implementation.
1064 Set *LVAL to lval_memory, lval_register, or not_lval, depending on
1065 whether the value was fetched from memory, from a register, or in a
1066 strange and non-modifiable way (e.g. a frame pointer which was
1067 calculated rather than fetched). We will use not_lval for values
1068 fetched from generic dummy frames.
1070 Set *ADDRP to the address, either in memory or as a REGISTER_BYTE
1071 offset into the registers array. If the value is stored in a dummy
1072 frame, set *ADDRP to zero.
1074 The argument RAW_BUFFER must point to aligned memory. */
1077 deprecated_generic_get_saved_register (char *raw_buffer
, int *optimized
,
1079 struct frame_info
*frame
, int regnum
,
1080 enum lval_type
*lval
)
1082 if (!target_has_registers
)
1083 error ("No registers.");
1085 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
1087 /* Normal systems don't optimize out things with register numbers. */
1088 if (optimized
!= NULL
)
1091 if (addrp
) /* default assumption: not found in memory */
1094 /* Note: since the current frame's registers could only have been
1095 saved by frames INTERIOR TO the current frame, we skip examining
1096 the current frame itself: otherwise, we would be getting the
1097 previous frame's registers which were saved by the current frame. */
1101 for (frame
= get_next_frame (frame
);
1102 frame_relative_level (frame
) >= 0;
1103 frame
= get_next_frame (frame
))
1105 if (get_frame_type (frame
) == DUMMY_FRAME
)
1107 if (lval
) /* found it in a CALL_DUMMY frame */
1110 /* FIXME: cagney/2002-06-26: This should be via the
1111 gdbarch_register_read() method so that it, on the
1112 fly, constructs either a raw or pseudo register
1113 from the raw register cache. */
1115 (generic_find_dummy_frame (get_frame_pc (frame
),
1116 get_frame_base (frame
)),
1117 regnum
, raw_buffer
);
1121 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
1122 if (get_frame_saved_regs (frame
) != NULL
1123 && get_frame_saved_regs (frame
)[regnum
] != 0)
1125 if (lval
) /* found it saved on the stack */
1126 *lval
= lval_memory
;
1127 if (regnum
== SP_REGNUM
)
1129 if (raw_buffer
) /* SP register treated specially */
1130 store_address (raw_buffer
, REGISTER_RAW_SIZE (regnum
),
1131 get_frame_saved_regs (frame
)[regnum
]);
1135 if (addrp
) /* any other register */
1136 *addrp
= get_frame_saved_regs (frame
)[regnum
];
1138 read_memory (get_frame_saved_regs (frame
)[regnum
], raw_buffer
,
1139 REGISTER_RAW_SIZE (regnum
));
1146 /* If we get thru the loop to this point, it means the register was
1147 not saved in any frame. Return the actual live-register value. */
1149 if (lval
) /* found it in a live register */
1150 *lval
= lval_register
;
1152 *addrp
= REGISTER_BYTE (regnum
);
1154 deprecated_read_register_gen (regnum
, raw_buffer
);
1157 /* Determine the frame's type based on its PC. */
1159 static enum frame_type
1160 frame_type_from_pc (CORE_ADDR pc
)
1162 /* FIXME: cagney/2002-11-24: Can't yet directly call
1163 pc_in_dummy_frame() as some architectures don't set
1164 PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
1165 latter is implemented by simply calling pc_in_dummy_frame). */
1166 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1167 && DEPRECATED_PC_IN_CALL_DUMMY (pc
, 0, 0))
1172 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
1173 if (PC_IN_SIGTRAMP (pc
, name
))
1174 return SIGTRAMP_FRAME
;
1176 return NORMAL_FRAME
;
1180 /* Create an arbitrary (i.e. address specified by user) or innermost frame.
1181 Always returns a non-NULL value. */
1184 create_new_frame (CORE_ADDR addr
, CORE_ADDR pc
)
1186 struct frame_info
*fi
;
1190 fprintf_unfiltered (gdb_stdlog
,
1191 "{ create_new_frame (addr=0x%s, pc=0x%s) ",
1192 paddr_nz (addr
), paddr_nz (pc
));
1195 fi
= frame_obstack_zalloc (sizeof (struct frame_info
));
1197 fi
->next
= create_sentinel_frame (current_regcache
);
1199 /* Select/initialize both the unwind function and the frame's type
1201 fi
->unwind
= frame_unwind_find_by_pc (current_gdbarch
, pc
);
1202 if (fi
->unwind
->type
!= UNKNOWN_FRAME
)
1203 fi
->type
= fi
->unwind
->type
;
1205 fi
->type
= frame_type_from_pc (pc
);
1208 deprecated_update_frame_base_hack (fi
, addr
);
1209 deprecated_update_frame_pc_hack (fi
, pc
);
1211 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1212 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi
);
1216 fprintf_unfiltered (gdb_stdlog
, "-> ");
1217 fprint_frame (gdb_stdlog
, fi
);
1218 fprintf_unfiltered (gdb_stdlog
, " }\n");
1224 /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the
1225 innermost frame). Be careful to not fall off the bottom of the
1226 frame chain and onto the sentinel frame. */
1229 get_next_frame (struct frame_info
*this_frame
)
1231 if (this_frame
->level
> 0)
1232 return this_frame
->next
;
1237 /* Flush the entire frame cache. */
1240 flush_cached_frames (void)
1242 /* Since we can't really be sure what the first object allocated was */
1243 obstack_free (&frame_cache_obstack
, 0);
1244 obstack_init (&frame_cache_obstack
);
1246 current_frame
= NULL
; /* Invalidate cache */
1247 select_frame (NULL
);
1248 annotate_frames_invalid ();
1250 fprintf_unfiltered (gdb_stdlog
, "{ flush_cached_frames () }\n");
1253 /* Flush the frame cache, and start a new one if necessary. */
1256 reinit_frame_cache (void)
1258 flush_cached_frames ();
1260 /* FIXME: The inferior_ptid test is wrong if there is a corefile. */
1261 if (PIDGET (inferior_ptid
) != 0)
1263 select_frame (get_current_frame ());
1267 /* Create the previous frame using the deprecated methods
1268 INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
1270 static struct frame_info
*
1271 legacy_get_prev_frame (struct frame_info
*this_frame
)
1273 CORE_ADDR address
= 0;
1274 struct frame_info
*prev
;
1277 /* Don't frame_debug print legacy_get_prev_frame() here, just
1278 confuses the output. */
1280 /* Allocate the new frame.
1282 There is no reason to worry about memory leaks, should the
1283 remainder of the function fail. The allocated memory will be
1284 quickly reclaimed when the frame cache is flushed, and the `we've
1285 been here before' check, in get_prev_frame will stop repeated
1286 memory allocation calls. */
1287 prev
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1288 prev
->level
= this_frame
->level
+ 1;
1290 /* Do not completly wire it in to the frame chain. Some (bad) code
1291 in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull
1292 some fancy tricks (of course such code is, by definition,
1295 On the other hand, methods, such as get_frame_pc() and
1296 get_frame_base() rely on being able to walk along the frame
1297 chain. Make certain that at least they work by providing that
1298 link. Of course things manipulating prev can't go back. */
1299 prev
->next
= this_frame
;
1301 /* NOTE: cagney/2002-11-18: Should have been correctly setting the
1302 frame's type here, before anything else, and not last, at the
1303 bottom of this function. The various
1304 DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC,
1305 DEPRECATED_INIT_FRAME_PC_FIRST and
1306 DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds
1307 that handle the frame not being correctly set from the start.
1308 Unfortunatly those same work-arounds rely on the type defaulting
1309 to NORMAL_FRAME. Ulgh! The new frame code does not have this
1311 prev
->type
= UNKNOWN_FRAME
;
1313 /* A legacy frame's ID is always computed here. Mark it as valid. */
1314 prev
->this_id
.p
= 1;
1316 /* Handle sentinel frame unwind as a special case. */
1317 if (this_frame
->level
< 0)
1319 /* Try to unwind the PC. If that doesn't work, assume we've reached
1320 the oldest frame and simply return. Is there a better sentinal
1321 value? The unwound PC value is then used to initialize the new
1322 previous frame's type.
1324 Note that the pc-unwind is intentionally performed before the
1325 frame chain. This is ok since, for old targets, both
1326 frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and
1327 DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
1328 have already been initialized (using
1329 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1332 By unwinding the PC first, it becomes possible to, in the case of
1333 a dummy frame, avoid also unwinding the frame ID. This is
1334 because (well ignoring the PPC) a dummy frame can be located
1335 using THIS_FRAME's frame ID. */
1337 deprecated_update_frame_pc_hack (prev
, frame_pc_unwind (this_frame
));
1338 if (get_frame_pc (prev
) == 0)
1340 /* The allocated PREV_FRAME will be reclaimed when the frame
1341 obstack is next purged. */
1344 fprintf_unfiltered (gdb_stdlog
, "-> ");
1345 fprint_frame (gdb_stdlog
, NULL
);
1346 fprintf_unfiltered (gdb_stdlog
,
1347 " // unwound legacy PC zero }\n");
1352 /* Set the unwind functions based on that identified PC. Ditto
1353 for the "type" but strongly prefer the unwinder's frame type. */
1354 prev
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
1355 get_frame_pc (prev
));
1356 if (prev
->unwind
->type
== UNKNOWN_FRAME
)
1357 prev
->type
= frame_type_from_pc (get_frame_pc (prev
));
1359 prev
->type
= prev
->unwind
->type
;
1361 /* Find the prev's frame's ID. */
1362 if (prev
->type
== DUMMY_FRAME
1363 && gdbarch_unwind_dummy_id_p (current_gdbarch
))
1365 /* When unwinding a normal frame, the stack structure is
1366 determined by analyzing the frame's function's code (be
1367 it using brute force prologue analysis, or the dwarf2
1368 CFI). In the case of a dummy frame, that simply isn't
1369 possible. The The PC is either the program entry point,
1370 or some random address on the stack. Trying to use that
1371 PC to apply standard frame ID unwind techniques is just
1372 asking for trouble. */
1373 /* Assume call_function_by_hand(), via SAVE_DUMMY_FRAME_TOS,
1374 previously saved the dummy frame's ID. Things only work
1375 if the two return the same value. */
1376 gdb_assert (SAVE_DUMMY_FRAME_TOS_P ());
1377 /* Use an architecture specific method to extract the prev's
1378 dummy ID from the next frame. Note that this method uses
1379 frame_register_unwind to obtain the register values
1380 needed to determine the dummy frame's ID. */
1381 prev
->this_id
.value
= gdbarch_unwind_dummy_id (current_gdbarch
,
1386 /* We're unwinding a sentinel frame, the PC of which is
1387 pointing at a stack dummy. Fake up the dummy frame's ID
1388 using the same sequence as is found a traditional
1389 unwinder. Once all architectures supply the
1390 unwind_dummy_id method, this code can go away. */
1391 prev
->this_id
.value
= frame_id_build (read_fp (), read_pc ());
1394 /* Check that the unwound ID is valid. */
1395 if (!frame_id_p (prev
->this_id
.value
))
1399 fprintf_unfiltered (gdb_stdlog
, "-> ");
1400 fprint_frame (gdb_stdlog
, NULL
);
1401 fprintf_unfiltered (gdb_stdlog
,
1402 " // unwound legacy ID invalid }\n");
1407 /* Check that the new frame isn't inner to (younger, below,
1408 next) the old frame. If that happens the frame unwind is
1410 /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
1411 that doesn't have a valid frame ID. Should instead set the
1412 sentinel frame's frame ID to a `sentinel'. Leave it until
1413 after the switch to storing the frame ID, instead of the
1414 frame base, in the frame object. */
1417 this_frame
->prev
= prev
;
1419 /* FIXME: cagney/2002-01-19: This call will go away. Instead of
1420 initializing extra info, all frames will use the frame_cache
1421 (passed to the unwind functions) to store additional frame
1422 info. Unfortunatly legacy targets can't use
1423 legacy_get_prev_frame() to unwind the sentinel frame and,
1424 consequently, are forced to take this code path and rely on
1425 the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to
1426 initialize the inner-most frame. */
1427 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1429 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev
);
1432 if (prev
->type
== NORMAL_FRAME
)
1433 prev
->this_id
.value
.code_addr
1434 = get_pc_function_start (prev
->this_id
.value
.code_addr
);
1438 fprintf_unfiltered (gdb_stdlog
, "-> ");
1439 fprint_frame (gdb_stdlog
, prev
);
1440 fprintf_unfiltered (gdb_stdlog
, " } // legacy innermost frame\n");
1445 /* This code only works on normal frames. A sentinel frame, where
1446 the level is -1, should never reach this code. */
1447 gdb_assert (this_frame
->level
>= 0);
1449 /* On some machines it is possible to call a function without
1450 setting up a stack frame for it. On these machines, we
1451 define this macro to take two args; a frameinfo pointer
1452 identifying a frame and a variable to set or clear if it is
1453 or isn't leafless. */
1455 /* Still don't want to worry about this except on the innermost
1456 frame. This macro will set FROMLEAF if THIS_FRAME is a frameless
1457 function invocation. */
1458 if (this_frame
->level
== 0)
1459 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
1460 the frame chain, not just the inner most frame! The generic,
1461 per-architecture, frame code should handle this and the below
1462 should simply be removed. */
1463 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (this_frame
);
1468 /* A frameless inner-most frame. The `FP' (which isn't an
1469 architecture frame-pointer register!) of the caller is the same
1471 /* FIXME: 2002-11-09: There isn't any reason to special case this
1472 edge condition. Instead the per-architecture code should hande
1474 address
= get_frame_base (this_frame
);
1477 /* Two macros defined in tm.h specify the machine-dependent
1478 actions to be performed here.
1480 First, get the frame's chain-pointer.
1482 If that is zero, the frame is the outermost frame or a leaf
1483 called by the outermost frame. This means that if start
1484 calls main without a frame, we'll return 0 (which is fine
1487 Nope; there's a problem. This also returns when the current
1488 routine is a leaf of main. This is unacceptable. We move
1489 this to after the ffi test; I'd rather have backtraces from
1490 start go curfluy than have an abort called from main not show
1492 gdb_assert (DEPRECATED_FRAME_CHAIN_P ());
1493 address
= DEPRECATED_FRAME_CHAIN (this_frame
);
1495 if (!legacy_frame_chain_valid (address
, this_frame
))
1499 fprintf_unfiltered (gdb_stdlog
, "-> ");
1500 fprint_frame (gdb_stdlog
, NULL
);
1501 fprintf_unfiltered (gdb_stdlog
,
1502 " // legacy frame chain invalid }\n");
1511 fprintf_unfiltered (gdb_stdlog
, "-> ");
1512 fprint_frame (gdb_stdlog
, NULL
);
1513 fprintf_unfiltered (gdb_stdlog
,
1514 " // legacy frame chain NULL }\n");
1519 /* Link in the already allocated prev frame. */
1520 this_frame
->prev
= prev
;
1521 deprecated_update_frame_base_hack (prev
, address
);
1523 /* This change should not be needed, FIXME! We should determine
1524 whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
1525 after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
1526 way to express what goes on here.
1528 DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
1529 create_new_frame (where the PC is already set up) and here (where
1530 it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
1531 always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
1533 The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
1534 requires the PC value (which hasn't been set yet). Some other
1535 machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
1536 before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
1538 We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
1539 complication to an already overcomplicated part of GDB.
1540 gnu@cygnus.com, 15Sep92.
1542 Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
1543 DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
1545 SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
1546 (read_fp ()), read_pc ()). Machines with extra frame info would
1547 do that (or the local equivalent) and then set the extra fields.
1549 SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
1550 create_new_frame would no longer init extra frame info;
1551 SETUP_ARBITRARY_FRAME would have to do that.
1553 INIT_PREV_FRAME(fromleaf, prev) Replace
1554 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
1555 This should also return a flag saying whether to keep the new
1556 frame, or whether to discard it, because on some machines (e.g.
1557 mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID
1558 called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good
1559 way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID
1560 into the extra fields of the new frame). std_frame_pc(fromleaf,
1563 This is the default setting for INIT_PREV_FRAME. It just does
1564 what the default DEPRECATED_INIT_FRAME_PC does. Some machines
1565 will call it from INIT_PREV_FRAME (either at the beginning, the
1566 end, or in the middle). Some machines won't use it.
1568 kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
1570 /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
1571 reason for things to be this complicated.
1573 The trick is to assume that there is always a frame. Instead of
1574 special casing the inner-most frame, create fake frame
1575 (containing the hardware registers) that is inner to the
1576 user-visible inner-most frame (...) and then unwind from that.
1577 That way architecture code can use use the standard
1578 frame_XX_unwind() functions and not differentiate between the
1579 inner most and any other case.
1581 Since there is always a frame to unwind from, there is always
1582 somewhere (THIS_FRAME) to store all the info needed to construct
1583 a new (previous) frame without having to first create it. This
1584 means that the convolution below - needing to carefully order a
1585 frame's initialization - isn't needed.
1587 The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least
1588 for a more up-to-date architecture, always calls
1589 FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but
1590 without first needing the frame! Instead of the convolution
1591 below, we could have simply called FRAME_SAVED_PC() and been done
1592 with it! Note that FRAME_SAVED_PC() is being superseed by
1593 frame_pc_unwind() and that function does have somewhere to cache
1596 if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
1597 deprecated_update_frame_pc_hack (prev
,
1598 DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf
,
1601 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1602 DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf
, prev
);
1604 /* This entry is in the frame queue now, which is good since
1605 FRAME_SAVED_PC may use that queue to figure out its value (see
1606 tm-sparc.h). We want the pc saved in the inferior frame. */
1607 if (DEPRECATED_INIT_FRAME_PC_P ())
1608 deprecated_update_frame_pc_hack (prev
,
1609 DEPRECATED_INIT_FRAME_PC (fromleaf
,
1612 /* If ->frame and ->pc are unchanged, we are in the process of
1613 getting ourselves into an infinite backtrace. Some architectures
1614 check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems
1615 like there is no reason this can't be an architecture-independent
1617 if (get_frame_base (prev
) == get_frame_base (this_frame
)
1618 && get_frame_pc (prev
) == get_frame_pc (this_frame
))
1620 this_frame
->prev
= NULL
;
1621 obstack_free (&frame_cache_obstack
, prev
);
1624 fprintf_unfiltered (gdb_stdlog
, "-> ");
1625 fprint_frame (gdb_stdlog
, NULL
);
1626 fprintf_unfiltered (gdb_stdlog
,
1627 " // legacy this.id == prev.id }\n");
1632 /* Initialize the code used to unwind the frame PREV based on the PC
1633 (and probably other architectural information). The PC lets you
1634 check things like the debug info at that point (dwarf2cfi?) and
1635 use that to decide how the frame should be unwound. */
1636 prev
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
1637 get_frame_pc (prev
));
1639 /* If the unwinder provides a frame type, use it. Otherwize
1640 continue on to that heuristic mess. */
1641 if (prev
->unwind
->type
!= UNKNOWN_FRAME
)
1643 prev
->type
= prev
->unwind
->type
;
1644 if (prev
->type
== NORMAL_FRAME
)
1645 prev
->this_id
.value
.code_addr
1646 = get_pc_function_start (prev
->this_id
.value
.code_addr
);
1649 fprintf_unfiltered (gdb_stdlog
, "-> ");
1650 fprint_frame (gdb_stdlog
, prev
);
1651 fprintf_unfiltered (gdb_stdlog
, " } // legacy with unwound type\n");
1656 /* NOTE: cagney/2002-11-18: The code segments, found in
1657 create_new_frame and get_prev_frame(), that initializes the
1658 frames type is subtly different. The latter only updates ->type
1659 when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
1660 get_prev_frame() overriding the frame's type when the INIT code
1661 has previously set it. This is really somewhat bogus. The
1662 initialization, as seen in create_new_frame(), should occur
1663 before the INIT function has been called. */
1664 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1665 && (DEPRECATED_PC_IN_CALL_DUMMY_P ()
1666 ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev
), 0, 0)
1667 : pc_in_dummy_frame (get_frame_pc (prev
))))
1668 prev
->type
= DUMMY_FRAME
;
1671 /* FIXME: cagney/2002-11-10: This should be moved to before the
1672 INIT code above so that the INIT code knows what the frame's
1673 type is (in fact, for a [generic] dummy-frame, the type can
1674 be set and then the entire initialization can be skipped.
1675 Unforunatly, its the INIT code that sets the PC (Hmm, catch
1678 find_pc_partial_function (get_frame_pc (prev
), &name
, NULL
, NULL
);
1679 if (PC_IN_SIGTRAMP (get_frame_pc (prev
), name
))
1680 prev
->type
= SIGTRAMP_FRAME
;
1681 /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
1682 architectures are forcing the frame's type in INIT so we
1683 don't want to override it here. Remember, NORMAL_FRAME == 0,
1684 so it all works (just :-/). Once this initialization is
1685 moved to the start of this function, all this nastness will
1689 if (prev
->type
== NORMAL_FRAME
)
1690 prev
->this_id
.value
.code_addr
1691 = get_pc_function_start (prev
->this_id
.value
.code_addr
);
1695 fprintf_unfiltered (gdb_stdlog
, "-> ");
1696 fprint_frame (gdb_stdlog
, prev
);
1697 fprintf_unfiltered (gdb_stdlog
, " } // legacy with confused type\n");
1703 /* Return a structure containing various interesting information
1704 about the frame that called THIS_FRAME. Returns NULL
1705 if there is no such frame. */
1708 get_prev_frame (struct frame_info
*this_frame
)
1710 struct frame_info
*prev_frame
;
1714 fprintf_unfiltered (gdb_stdlog
, "{ get_prev_frame (this_frame=");
1715 if (this_frame
!= NULL
)
1716 fprintf_unfiltered (gdb_stdlog
, "%d", this_frame
->level
);
1718 fprintf_unfiltered (gdb_stdlog
, "<NULL>");
1719 fprintf_unfiltered (gdb_stdlog
, ") ");
1722 /* Return the inner-most frame, when the caller passes in NULL. */
1723 /* NOTE: cagney/2002-11-09: Not sure how this would happen. The
1724 caller should have previously obtained a valid frame using
1725 get_selected_frame() and then called this code - only possibility
1726 I can think of is code behaving badly.
1728 NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
1729 block_innermost_frame(). It does the sequence: frame = NULL;
1730 while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
1731 it couldn't be written better, I don't know.
1733 NOTE: cagney/2003-01-11: I suspect what is happening is
1734 block_innermost_frame() is, when the target has no state
1735 (registers, memory, ...), still calling this function. The
1736 assumption being that this function will return NULL indicating
1737 that a frame isn't possible, rather than checking that the target
1738 has state and then calling get_current_frame() and
1739 get_prev_frame(). This is a guess mind. */
1740 if (this_frame
== NULL
)
1742 /* NOTE: cagney/2002-11-09: There was a code segment here that
1743 would error out when CURRENT_FRAME was NULL. The comment
1744 that went with it made the claim ...
1746 ``This screws value_of_variable, which just wants a nice
1747 clean NULL return from block_innermost_frame if there are no
1748 frames. I don't think I've ever seen this message happen
1749 otherwise. And returning NULL here is a perfectly legitimate
1752 Per the above, this code shouldn't even be called with a NULL
1754 return current_frame
;
1757 /* There is always a frame. If this assertion fails, suspect that
1758 something should be calling get_selected_frame() or
1759 get_current_frame(). */
1760 gdb_assert (this_frame
!= NULL
);
1762 if (this_frame
->level
>= 0
1763 && !backtrace_below_main
1764 && inside_main_func (get_frame_pc (this_frame
)))
1765 /* Don't unwind past main(), bug always unwind the sentinel frame.
1766 Note, this is done _before_ the frame has been marked as
1767 previously unwound. That way if the user later decides to
1768 allow unwinds past main(), that just happens. */
1771 fprintf_unfiltered (gdb_stdlog
, "-> NULL // inside main func }\n");
1775 /* Only try to do the unwind once. */
1776 if (this_frame
->prev_p
)
1780 fprintf_unfiltered (gdb_stdlog
, "-> ");
1781 fprint_frame (gdb_stdlog
, this_frame
->prev
);
1782 fprintf_unfiltered (gdb_stdlog
, " // cached \n");
1784 return this_frame
->prev
;
1786 this_frame
->prev_p
= 1;
1789 /* If we're inside the entry file, it isn't valid. Don't apply this
1790 test to a dummy frame - dummy frame PC's typically land in the
1791 entry file. Don't apply this test to the sentinel frame.
1792 Sentinel frames should always be allowed to unwind. */
1793 /* NOTE: drow/2002-12-25: should there be a way to disable this
1794 check? It assumes a single small entry file, and the way some
1795 debug readers (e.g. dbxread) figure out which object is the
1796 entry file is somewhat hokey. */
1797 /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
1798 then it should probably be moved to before the ->prev_p test,
1800 /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call to
1801 inside_entry_file destroys a meaningful backtrace under some
1802 conditions. E. g. the backtrace tests in the asm-source testcase
1803 are broken for some targets. In this test the functions are all
1804 implemented as part of one file and the testcase is not necessarily
1805 linked with a start file (depending on the target). What happens is,
1806 that the first frame is printed normaly and following frames are
1807 treated as being inside the enttry file then. This way, only the
1808 #0 frame is printed in the backtrace output. */
1809 if (this_frame
->type
!= DUMMY_FRAME
&& this_frame
->level
>= 0
1810 && inside_entry_file (get_frame_pc (this_frame
)))
1814 fprintf_unfiltered (gdb_stdlog
, "-> ");
1815 fprint_frame (gdb_stdlog
, NULL
);
1816 fprintf_unfiltered (gdb_stdlog
, " // inside entry file }\n");
1822 /* If we're already inside the entry function for the main objfile,
1823 then it isn't valid. Don't apply this test to a dummy frame -
1824 dummy frame PC's typically land in the entry func. Don't apply
1825 this test to the sentinel frame. Sentinel frames should always
1826 be allowed to unwind. */
1827 /* NOTE: cagney/2003-02-25: Don't enable until someone has found
1828 hard evidence that this is needed. */
1830 && this_frame
->type
!= DUMMY_FRAME
&& this_frame
->level
>= 0
1831 && inside_entry_func (get_frame_pc (this_frame
)))
1835 fprintf_unfiltered (gdb_stdlog
, "-> ");
1836 fprint_frame (gdb_stdlog
, NULL
);
1837 fprintf_unfiltered (gdb_stdlog
, "// inside entry func }\n");
1842 /* If any of the old frame initialization methods are around, use
1843 the legacy get_prev_frame method. */
1844 if (legacy_frame_p (current_gdbarch
))
1846 prev_frame
= legacy_get_prev_frame (this_frame
);
1850 /* Check that this frame's ID was valid. If it wasn't, don't try to
1851 unwind to the prev frame. Be careful to not apply this test to
1852 the sentinel frame. */
1853 if (this_frame
->level
>= 0 && !frame_id_p (get_frame_id (this_frame
)))
1857 fprintf_unfiltered (gdb_stdlog
, "-> ");
1858 fprint_frame (gdb_stdlog
, NULL
);
1859 fprintf_unfiltered (gdb_stdlog
, " // this ID is NULL }\n");
1864 /* Check that this frame's ID isn't inner to (younger, below, next)
1865 the next frame. This happens when frame unwind goes backwards.
1866 Since the sentinel frame isn't valid, don't apply this if this
1867 frame is entier the inner-most or sentinel frame. */
1868 if (this_frame
->level
> 0
1869 && frame_id_inner (get_frame_id (this_frame
),
1870 get_frame_id (this_frame
->next
)))
1871 error ("This frame inner-to next frame (corrupt stack?)");
1873 /* Check that this and the next frame are different. If they are
1874 not, there is most likely a stack cycle. As with the inner-than
1875 test, avoid the inner-most and sentinel frames. */
1876 /* FIXME: cagney/2003-03-17: Can't yet enable this this check. The
1877 frame_id_eq() method doesn't yet use function addresses when
1878 comparing frame IDs. */
1880 && this_frame
->level
> 0
1881 && frame_id_eq (get_frame_id (this_frame
),
1882 get_frame_id (this_frame
->next
)))
1883 error ("This frame identical to next frame (corrupt stack?)");
1885 /* Allocate the new frame but do not wire it in to the frame chain.
1886 Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
1887 frame->next to pull some fancy tricks (of course such code is, by
1888 definition, recursive). Try to prevent it.
1890 There is no reason to worry about memory leaks, should the
1891 remainder of the function fail. The allocated memory will be
1892 quickly reclaimed when the frame cache is flushed, and the `we've
1893 been here before' check above will stop repeated memory
1894 allocation calls. */
1895 prev_frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1896 prev_frame
->level
= this_frame
->level
+ 1;
1898 /* Try to unwind the PC. If that doesn't work, assume we've reached
1899 the oldest frame and simply return. Is there a better sentinal
1900 value? The unwound PC value is then used to initialize the new
1901 previous frame's type.
1903 Note that the pc-unwind is intentionally performed before the
1904 frame chain. This is ok since, for old targets, both
1905 frame_pc_unwind (nee, FRAME_SAVED_PC) and
1906 DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
1907 have already been initialized (using
1908 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1911 By unwinding the PC first, it becomes possible to, in the case of
1912 a dummy frame, avoid also unwinding the frame ID. This is
1913 because (well ignoring the PPC) a dummy frame can be located
1914 using THIS_FRAME's frame ID. */
1916 if (frame_pc_unwind (this_frame
) == 0)
1918 /* The allocated PREV_FRAME will be reclaimed when the frame
1919 obstack is next purged. */
1922 fprintf_unfiltered (gdb_stdlog
, "-> ");
1923 fprint_frame (gdb_stdlog
, NULL
);
1924 fprintf_unfiltered (gdb_stdlog
, " // unwound PC zero }\n");
1929 /* Don't yet compute ->unwind (and hence ->type). It is computed
1930 on-demand in get_frame_type, frame_register_unwind, and
1933 /* Don't yet compute the frame's ID. It is computed on-demand by
1936 /* The unwound frame ID is validate at the start of this function,
1937 as part of the logic to decide if that frame should be further
1938 unwound, and not here while the prev frame is being created.
1939 Doing this makes it possible for the user to examine a frame that
1940 has an invalid frame ID.
1942 The very old VAX frame_args_address_correct() method noted: [...]
1943 For the sake of argument, suppose that the stack is somewhat
1944 trashed (which is one reason that "info frame" exists). So,
1945 return 0 (indicating we don't know the address of the arglist) if
1946 we don't know what frame this frame calls. */
1949 this_frame
->prev
= prev_frame
;
1950 prev_frame
->next
= this_frame
;
1954 fprintf_unfiltered (gdb_stdlog
, "-> ");
1955 fprint_frame (gdb_stdlog
, prev_frame
);
1956 fprintf_unfiltered (gdb_stdlog
, " }\n");
1963 get_frame_pc (struct frame_info
*frame
)
1965 gdb_assert (frame
->next
!= NULL
);
1966 return frame_pc_unwind (frame
->next
);
1970 pc_notcurrent (struct frame_info
*frame
)
1972 /* If FRAME is not the innermost frame, that normally means that
1973 FRAME->pc points at the return instruction (which is *after* the
1974 call instruction), and we want to get the line containing the
1975 call (because the call is where the user thinks the program is).
1976 However, if the next frame is either a SIGTRAMP_FRAME or a
1977 DUMMY_FRAME, then the next frame will contain a saved interrupt
1978 PC and such a PC indicates the current (rather than next)
1979 instruction/line, consequently, for such cases, want to get the
1980 line containing fi->pc. */
1981 struct frame_info
*next
= get_next_frame (frame
);
1982 int notcurrent
= (next
!= NULL
&& get_frame_type (next
) == NORMAL_FRAME
);
1987 find_frame_sal (struct frame_info
*frame
, struct symtab_and_line
*sal
)
1989 (*sal
) = find_pc_line (get_frame_pc (frame
), pc_notcurrent (frame
));
1992 /* Per "frame.h", return the ``address'' of the frame. Code should
1993 really be using get_frame_id(). */
1995 get_frame_base (struct frame_info
*fi
)
1997 return get_frame_id (fi
).stack_addr
;
2000 /* High-level offsets into the frame. Used by the debug info. */
2003 get_frame_base_address (struct frame_info
*fi
)
2005 if (get_frame_type (fi
) != NORMAL_FRAME
)
2007 if (fi
->base
== NULL
)
2008 fi
->base
= frame_base_find_by_pc (current_gdbarch
, get_frame_pc (fi
));
2009 /* Sneaky: If the low-level unwind and high-level base code share a
2010 common unwinder, let them share the prologue cache. */
2011 if (fi
->base
->unwind
== fi
->unwind
)
2012 return fi
->base
->this_base (fi
->next
, &fi
->prologue_cache
);
2013 return fi
->base
->this_base (fi
->next
, &fi
->base_cache
);
2017 get_frame_locals_address (struct frame_info
*fi
)
2020 if (get_frame_type (fi
) != NORMAL_FRAME
)
2022 /* If there isn't a frame address method, find it. */
2023 if (fi
->base
== NULL
)
2024 fi
->base
= frame_base_find_by_pc (current_gdbarch
, get_frame_pc (fi
));
2025 /* Sneaky: If the low-level unwind and high-level base code share a
2026 common unwinder, let them share the prologue cache. */
2027 if (fi
->base
->unwind
== fi
->unwind
)
2028 cache
= &fi
->prologue_cache
;
2030 cache
= &fi
->base_cache
;
2031 return fi
->base
->this_locals (fi
->next
, cache
);
2035 get_frame_args_address (struct frame_info
*fi
)
2038 if (get_frame_type (fi
) != NORMAL_FRAME
)
2040 /* If there isn't a frame address method, find it. */
2041 if (fi
->base
== NULL
)
2042 fi
->base
= frame_base_find_by_pc (current_gdbarch
, get_frame_pc (fi
));
2043 /* Sneaky: If the low-level unwind and high-level base code share a
2044 common unwinder, let them share the prologue cache. */
2045 if (fi
->base
->unwind
== fi
->unwind
)
2046 cache
= &fi
->prologue_cache
;
2048 cache
= &fi
->base_cache
;
2049 return fi
->base
->this_args (fi
->next
, cache
);
2052 /* Level of the selected frame: 0 for innermost, 1 for its caller, ...
2053 or -1 for a NULL frame. */
2056 frame_relative_level (struct frame_info
*fi
)
2065 get_frame_type (struct frame_info
*frame
)
2067 /* Some targets still don't use [generic] dummy frames. Catch them
2069 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
2070 && deprecated_frame_in_dummy (frame
))
2072 if (frame
->unwind
== NULL
)
2074 /* Initialize the frame's unwinder because it is that which
2075 provides the frame's type. */
2076 frame
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
2077 get_frame_pc (frame
));
2078 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
2079 type in the frame, the unwinder's type should be returned
2080 directly. Unfortunatly, legacy code, called by
2081 legacy_get_prev_frame, explicitly set the frames type using
2082 the method deprecated_set_frame_type(). */
2083 gdb_assert (frame
->unwind
->type
!= UNKNOWN_FRAME
);
2084 frame
->type
= frame
->unwind
->type
;
2086 if (frame
->type
== UNKNOWN_FRAME
)
2087 return NORMAL_FRAME
;
2093 deprecated_set_frame_type (struct frame_info
*frame
, enum frame_type type
)
2095 /* Arrrg! See comment in "frame.h". */
2099 struct frame_extra_info
*
2100 get_frame_extra_info (struct frame_info
*fi
)
2102 return fi
->extra_info
;
2105 struct frame_extra_info
*
2106 frame_extra_info_zalloc (struct frame_info
*fi
, long size
)
2108 fi
->extra_info
= frame_obstack_zalloc (size
);
2109 return fi
->extra_info
;
2113 deprecated_update_frame_pc_hack (struct frame_info
*frame
, CORE_ADDR pc
)
2116 fprintf_unfiltered (gdb_stdlog
,
2117 "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n",
2118 frame
->level
, paddr_nz (pc
));
2119 /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
2120 maintaining a locally allocated frame object. Since such frame's
2121 are not in the frame chain, it isn't possible to assume that the
2122 frame has a next. Sigh. */
2123 if (frame
->next
!= NULL
)
2125 /* While we're at it, update this frame's cached PC value, found
2126 in the next frame. Oh for the day when "struct frame_info"
2127 is opaque and this hack on hack can just go away. */
2128 frame
->next
->prev_pc
.value
= pc
;
2129 frame
->next
->prev_pc
.p
= 1;
2134 deprecated_update_frame_base_hack (struct frame_info
*frame
, CORE_ADDR base
)
2137 fprintf_unfiltered (gdb_stdlog
,
2138 "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n",
2139 frame
->level
, paddr_nz (base
));
2140 /* See comment in "frame.h". */
2141 frame
->this_id
.value
.stack_addr
= base
;
2145 deprecated_set_frame_saved_regs_hack (struct frame_info
*frame
,
2146 CORE_ADDR
*saved_regs
)
2148 frame
->saved_regs
= saved_regs
;
2152 deprecated_set_frame_extra_info_hack (struct frame_info
*frame
,
2153 struct frame_extra_info
*extra_info
)
2155 frame
->extra_info
= extra_info
;
2159 deprecated_set_frame_next_hack (struct frame_info
*fi
,
2160 struct frame_info
*next
)
2166 deprecated_set_frame_prev_hack (struct frame_info
*fi
,
2167 struct frame_info
*prev
)
2173 deprecated_get_frame_context (struct frame_info
*fi
)
2179 deprecated_set_frame_context (struct frame_info
*fi
,
2180 struct context
*context
)
2182 fi
->context
= context
;
2186 deprecated_frame_xmalloc (void)
2188 struct frame_info
*frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
2189 frame
->this_id
.p
= 1;
2194 deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs
,
2195 long sizeof_extra_info
)
2197 struct frame_info
*frame
= deprecated_frame_xmalloc ();
2198 make_cleanup (xfree
, frame
);
2199 if (sizeof_saved_regs
> 0)
2201 frame
->saved_regs
= xcalloc (1, sizeof_saved_regs
);
2202 make_cleanup (xfree
, frame
->saved_regs
);
2204 if (sizeof_extra_info
> 0)
2206 frame
->extra_info
= xcalloc (1, sizeof_extra_info
);
2207 make_cleanup (xfree
, frame
->extra_info
);
2213 legacy_frame_p (struct gdbarch
*current_gdbarch
)
2215 return (DEPRECATED_INIT_FRAME_PC_P ()
2216 || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
2217 || DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
2218 || DEPRECATED_FRAME_CHAIN_P ()
2219 || !gdbarch_unwind_dummy_id_p (current_gdbarch
)
2220 || !SAVE_DUMMY_FRAME_TOS_P ());
2224 _initialize_frame (void)
2226 obstack_init (&frame_cache_obstack
);
2228 /* FIXME: cagney/2003-01-19: This command needs a rename. Suggest
2229 `set backtrace {past,beyond,...}-main'. Also suggest adding `set
2230 backtrace ...-start' to control backtraces past start. The
2231 problem with `below' is that it stops the `up' command. */
2233 add_setshow_boolean_cmd ("backtrace-below-main", class_obscure
,
2234 &backtrace_below_main
, "\
2235 Set whether backtraces should continue past \"main\".\n\
2236 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2237 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2238 of the stack trace.", "\
2239 Show whether backtraces should continue past \"main\".\n\
2240 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2241 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2242 of the stack trace.",
2243 NULL
, NULL
, &setlist
, &showlist
);
2246 /* Debug this files internals. */
2247 add_show_from_set (add_set_cmd ("frame", class_maintenance
, var_zinteger
,
2248 &frame_debug
, "Set frame debugging.\n\
2249 When non-zero, frame specific internal debugging is enabled.", &setdebuglist
),