1 /* Scheme interface to stack frames.
3 Copyright (C) 2008-2016 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 /* See README file in this directory for implementation notes, coding
21 conventions, et.al. */
31 #include "user-regs.h"
33 #include "guile-internal.h"
35 /* The <gdb:frame> smob.
36 The typedef for this struct is in guile-internal.h. */
40 /* This always appears first. */
43 struct frame_id frame_id
;
44 struct gdbarch
*gdbarch
;
46 /* Frames are tracked by inferior.
47 We need some place to put the eq?-able hash table, and this feels as
48 good a place as any. Frames in one inferior shouldn't be considered
49 equal to frames in a different inferior. The frame becomes invalid if
50 this becomes NULL (the inferior has been deleted from gdb).
51 It's easier to relax restrictions than impose them after the fact.
52 N.B. It is an outstanding question whether a frame survives reruns of
53 the inferior. Intuitively the answer is "No", but currently a frame
54 also survives, e.g., multiple invocations of the same function from
55 the same point. Even different threads can have the same frame, e.g.,
56 if a thread dies and a new thread gets the same stack. */
57 struct inferior
*inferior
;
59 /* Marks that the FRAME_ID member actually holds the ID of the frame next
60 to this, and not this frame's ID itself. This is a hack to permit Scheme
61 frame objects which represent invalid frames (i.e., the last frame_info
62 in a corrupt stack). The problem arises from the fact that this code
63 relies on FRAME_ID to uniquely identify a frame, which is not always true
64 for the last "frame" in a corrupt stack (it can have a null ID, or the
65 same ID as the previous frame). Whenever get_prev_frame returns NULL, we
66 record the frame_id of the next frame and set FRAME_ID_IS_NEXT to 1. */
70 static const char frame_smob_name
[] = "gdb:frame";
72 /* The tag Guile knows the frame smob by. */
73 static scm_t_bits frame_smob_tag
;
75 /* Keywords used in argument passing. */
76 static SCM block_keyword
;
78 static const struct inferior_data
*frscm_inferior_data_key
;
80 /* Administrivia for frame smobs. */
82 /* Helper function to hash a frame_smob. */
85 frscm_hash_frame_smob (const void *p
)
87 const frame_smob
*f_smob
= (const frame_smob
*) p
;
88 const struct frame_id
*fid
= &f_smob
->frame_id
;
89 hashval_t hash
= htab_hash_pointer (f_smob
->inferior
);
91 if (fid
->stack_status
== FID_STACK_VALID
)
92 hash
= iterative_hash (&fid
->stack_addr
, sizeof (fid
->stack_addr
), hash
);
94 hash
= iterative_hash (&fid
->code_addr
, sizeof (fid
->code_addr
), hash
);
95 if (fid
->special_addr_p
)
96 hash
= iterative_hash (&fid
->special_addr
, sizeof (fid
->special_addr
),
102 /* Helper function to compute equality of frame_smobs. */
105 frscm_eq_frame_smob (const void *ap
, const void *bp
)
107 const frame_smob
*a
= (const frame_smob
*) ap
;
108 const frame_smob
*b
= (const frame_smob
*) bp
;
110 return (frame_id_eq (a
->frame_id
, b
->frame_id
)
111 && a
->inferior
== b
->inferior
112 && a
->inferior
!= NULL
);
115 /* Return the frame -> SCM mapping table.
116 It is created if necessary. */
119 frscm_inferior_frame_map (struct inferior
*inferior
)
121 htab_t htab
= (htab_t
) inferior_data (inferior
, frscm_inferior_data_key
);
125 htab
= gdbscm_create_eqable_gsmob_ptr_map (frscm_hash_frame_smob
,
126 frscm_eq_frame_smob
);
127 set_inferior_data (inferior
, frscm_inferior_data_key
, htab
);
133 /* The smob "free" function for <gdb:frame>. */
136 frscm_free_frame_smob (SCM self
)
138 frame_smob
*f_smob
= (frame_smob
*) SCM_SMOB_DATA (self
);
140 if (f_smob
->inferior
!= NULL
)
142 htab_t htab
= frscm_inferior_frame_map (f_smob
->inferior
);
144 gdbscm_clear_eqable_gsmob_ptr_slot (htab
, &f_smob
->base
);
147 /* Not necessary, done to catch bugs. */
148 f_smob
->inferior
= NULL
;
153 /* The smob "print" function for <gdb:frame>. */
156 frscm_print_frame_smob (SCM self
, SCM port
, scm_print_state
*pstate
)
158 frame_smob
*f_smob
= (frame_smob
*) SCM_SMOB_DATA (self
);
159 struct ui_file
*strfile
;
162 gdbscm_printf (port
, "#<%s ", frame_smob_name
);
164 strfile
= mem_fileopen ();
165 fprint_frame_id (strfile
, f_smob
->frame_id
);
166 s
= ui_file_xstrdup (strfile
, NULL
);
167 gdbscm_printf (port
, "%s", s
);
168 ui_file_delete (strfile
);
171 scm_puts (">", port
);
173 scm_remember_upto_here_1 (self
);
175 /* Non-zero means success. */
179 /* Low level routine to create a <gdb:frame> object. */
182 frscm_make_frame_smob (void)
184 frame_smob
*f_smob
= (frame_smob
*)
185 scm_gc_malloc (sizeof (frame_smob
), frame_smob_name
);
188 f_smob
->frame_id
= null_frame_id
;
189 f_smob
->gdbarch
= NULL
;
190 f_smob
->inferior
= NULL
;
191 f_smob
->frame_id_is_next
= 0;
192 f_scm
= scm_new_smob (frame_smob_tag
, (scm_t_bits
) f_smob
);
193 gdbscm_init_eqable_gsmob (&f_smob
->base
, f_scm
);
198 /* Return non-zero if SCM is a <gdb:frame> object. */
201 frscm_is_frame (SCM scm
)
203 return SCM_SMOB_PREDICATE (frame_smob_tag
, scm
);
206 /* (frame? object) -> boolean */
209 gdbscm_frame_p (SCM scm
)
211 return scm_from_bool (frscm_is_frame (scm
));
214 /* Create a new <gdb:frame> object that encapsulates FRAME.
215 Returns a <gdb:exception> object if there is an error. */
218 frscm_scm_from_frame (struct frame_info
*frame
, struct inferior
*inferior
)
220 frame_smob
*f_smob
, f_smob_for_lookup
;
223 eqable_gdb_smob
**slot
;
224 struct frame_id frame_id
= null_frame_id
;
225 struct gdbarch
*gdbarch
= NULL
;
226 int frame_id_is_next
= 0;
228 /* If we've already created a gsmob for this frame, return it.
229 This makes frames eq?-able. */
230 htab
= frscm_inferior_frame_map (inferior
);
231 f_smob_for_lookup
.frame_id
= get_frame_id (frame
);
232 f_smob_for_lookup
.inferior
= inferior
;
233 slot
= gdbscm_find_eqable_gsmob_ptr_slot (htab
, &f_smob_for_lookup
.base
);
235 return (*slot
)->containing_scm
;
239 /* Try to get the previous frame, to determine if this is the last frame
240 in a corrupt stack. If so, we need to store the frame_id of the next
241 frame and not of this one (which is possibly invalid). */
242 if (get_prev_frame (frame
) == NULL
243 && get_frame_unwind_stop_reason (frame
) != UNWIND_NO_REASON
244 && get_next_frame (frame
) != NULL
)
246 frame_id
= get_frame_id (get_next_frame (frame
));
247 frame_id_is_next
= 1;
251 frame_id
= get_frame_id (frame
);
252 frame_id_is_next
= 0;
254 gdbarch
= get_frame_arch (frame
);
256 CATCH (except
, RETURN_MASK_ALL
)
258 return gdbscm_scm_from_gdb_exception (except
);
262 f_scm
= frscm_make_frame_smob ();
263 f_smob
= (frame_smob
*) SCM_SMOB_DATA (f_scm
);
264 f_smob
->frame_id
= frame_id
;
265 f_smob
->gdbarch
= gdbarch
;
266 f_smob
->inferior
= inferior
;
267 f_smob
->frame_id_is_next
= frame_id_is_next
;
269 gdbscm_fill_eqable_gsmob_ptr_slot (slot
, &f_smob
->base
);
274 /* Create a new <gdb:frame> object that encapsulates FRAME.
275 A Scheme exception is thrown if there is an error. */
278 frscm_scm_from_frame_unsafe (struct frame_info
*frame
,
279 struct inferior
*inferior
)
281 SCM f_scm
= frscm_scm_from_frame (frame
, inferior
);
283 if (gdbscm_is_exception (f_scm
))
284 gdbscm_throw (f_scm
);
289 /* Returns the <gdb:frame> object in SELF.
290 Throws an exception if SELF is not a <gdb:frame> object. */
293 frscm_get_frame_arg_unsafe (SCM self
, int arg_pos
, const char *func_name
)
295 SCM_ASSERT_TYPE (frscm_is_frame (self
), self
, arg_pos
, func_name
,
301 /* There is no gdbscm_scm_to_frame function because translating
302 a frame SCM object to a struct frame_info * can throw a GDB error.
303 Thus code working with frames has to handle both Scheme errors (e.g., the
304 object is not a frame) and GDB errors (e.g., the frame lookup failed).
306 To help keep things clear we split what would be gdbscm_scm_to_frame
309 frscm_get_frame_smob_arg_unsafe
310 - throws a Scheme error if object is not a frame,
311 or if the inferior is gone or is no longer current
313 frscm_frame_smob_to_frame
314 - may throw a gdb error if the conversion fails
315 - it's not clear when it will and won't throw a GDB error,
316 but for robustness' sake we assume that whenever we call out to GDB
317 a GDB error may get thrown (and thus the call must be wrapped in a
320 /* Returns the frame_smob for the object wrapped by FRAME_SCM.
321 A Scheme error is thrown if FRAME_SCM is not a frame. */
324 frscm_get_frame_smob_arg_unsafe (SCM self
, int arg_pos
, const char *func_name
)
326 SCM f_scm
= frscm_get_frame_arg_unsafe (self
, arg_pos
, func_name
);
327 frame_smob
*f_smob
= (frame_smob
*) SCM_SMOB_DATA (f_scm
);
329 if (f_smob
->inferior
== NULL
)
331 gdbscm_invalid_object_error (func_name
, arg_pos
, self
,
334 if (f_smob
->inferior
!= current_inferior ())
335 scm_misc_error (func_name
, _("inferior has changed"), SCM_EOL
);
340 /* Returns the frame_info object wrapped by F_SMOB.
341 If the frame doesn't exist anymore (the frame id doesn't
342 correspond to any frame in the inferior), returns NULL.
343 This function calls GDB routines, so don't assume a GDB error will
347 frscm_frame_smob_to_frame (frame_smob
*f_smob
)
349 struct frame_info
*frame
;
351 frame
= frame_find_by_id (f_smob
->frame_id
);
355 if (f_smob
->frame_id_is_next
)
356 frame
= get_prev_frame (frame
);
361 /* Helper function for frscm_del_inferior_frames to mark the frame
365 frscm_mark_frame_invalid (void **slot
, void *info
)
367 frame_smob
*f_smob
= (frame_smob
*) *slot
;
369 f_smob
->inferior
= NULL
;
373 /* This function is called when an inferior is about to be freed.
374 Invalidate the frame as further actions on the frame could result
375 in bad data. All access to the frame should be gated by
376 frscm_get_frame_smob_arg_unsafe which will raise an exception on
380 frscm_del_inferior_frames (struct inferior
*inferior
, void *datum
)
382 htab_t htab
= (htab_t
) datum
;
386 htab_traverse_noresize (htab
, frscm_mark_frame_invalid
, NULL
);
393 /* (frame-valid? <gdb:frame>) -> bool
394 Returns #t if the frame corresponding to the frame_id of this
395 object still exists in the inferior. */
398 gdbscm_frame_valid_p (SCM self
)
401 struct frame_info
*frame
= NULL
;
403 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
407 frame
= frscm_frame_smob_to_frame (f_smob
);
409 CATCH (except
, RETURN_MASK_ALL
)
411 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
415 return scm_from_bool (frame
!= NULL
);
418 /* (frame-name <gdb:frame>) -> string
419 Returns the name of the function corresponding to this frame,
420 or #f if there is no function. */
423 gdbscm_frame_name (SCM self
)
427 enum language lang
= language_minimal
;
428 struct frame_info
*frame
= NULL
;
431 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
435 frame
= frscm_frame_smob_to_frame (f_smob
);
437 find_frame_funname (frame
, &name
, &lang
, NULL
);
439 CATCH (except
, RETURN_MASK_ALL
)
442 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
448 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
454 result
= gdbscm_scm_from_c_string (name
);
463 /* (frame-type <gdb:frame>) -> integer
464 Returns the frame type, namely one of the gdb:*_FRAME constants. */
467 gdbscm_frame_type (SCM self
)
470 enum frame_type type
= NORMAL_FRAME
;
471 struct frame_info
*frame
= NULL
;
473 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
477 frame
= frscm_frame_smob_to_frame (f_smob
);
479 type
= get_frame_type (frame
);
481 CATCH (except
, RETURN_MASK_ALL
)
483 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
489 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
493 return scm_from_int (type
);
496 /* (frame-arch <gdb:frame>) -> <gdb:architecture>
497 Returns the frame's architecture as a gdb:architecture object. */
500 gdbscm_frame_arch (SCM self
)
503 struct frame_info
*frame
= NULL
;
505 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
509 frame
= frscm_frame_smob_to_frame (f_smob
);
511 CATCH (except
, RETURN_MASK_ALL
)
513 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
519 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
523 return arscm_scm_from_arch (f_smob
->gdbarch
);
526 /* (frame-unwind-stop-reason <gdb:frame>) -> integer
527 Returns one of the gdb:FRAME_UNWIND_* constants. */
530 gdbscm_frame_unwind_stop_reason (SCM self
)
533 struct frame_info
*frame
= NULL
;
534 enum unwind_stop_reason stop_reason
;
536 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
540 frame
= frscm_frame_smob_to_frame (f_smob
);
542 CATCH (except
, RETURN_MASK_ALL
)
544 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
550 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
554 stop_reason
= get_frame_unwind_stop_reason (frame
);
556 return scm_from_int (stop_reason
);
559 /* (frame-pc <gdb:frame>) -> integer
560 Returns the frame's resume address. */
563 gdbscm_frame_pc (SCM self
)
567 struct frame_info
*frame
= NULL
;
569 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
573 frame
= frscm_frame_smob_to_frame (f_smob
);
575 pc
= get_frame_pc (frame
);
577 CATCH (except
, RETURN_MASK_ALL
)
579 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
585 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
589 return gdbscm_scm_from_ulongest (pc
);
592 /* (frame-block <gdb:frame>) -> <gdb:block>
593 Returns the frame's code block, or #f if one cannot be found. */
596 gdbscm_frame_block (SCM self
)
599 const struct block
*block
= NULL
, *fn_block
;
600 struct frame_info
*frame
= NULL
;
602 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
606 frame
= frscm_frame_smob_to_frame (f_smob
);
608 block
= get_frame_block (frame
, NULL
);
610 CATCH (except
, RETURN_MASK_ALL
)
612 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
618 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
622 for (fn_block
= block
;
623 fn_block
!= NULL
&& BLOCK_FUNCTION (fn_block
) == NULL
;
624 fn_block
= BLOCK_SUPERBLOCK (fn_block
))
627 if (block
== NULL
|| fn_block
== NULL
|| BLOCK_FUNCTION (fn_block
) == NULL
)
629 scm_misc_error (FUNC_NAME
, _("cannot find block for frame"),
635 return bkscm_scm_from_block
636 (block
, symbol_objfile (BLOCK_FUNCTION (fn_block
)));
642 /* (frame-function <gdb:frame>) -> <gdb:symbol>
643 Returns the symbol for the function corresponding to this frame,
644 or #f if there isn't one. */
647 gdbscm_frame_function (SCM self
)
650 struct symbol
*sym
= NULL
;
651 struct frame_info
*frame
= NULL
;
653 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
657 frame
= frscm_frame_smob_to_frame (f_smob
);
659 sym
= find_pc_function (get_frame_address_in_block (frame
));
661 CATCH (except
, RETURN_MASK_ALL
)
663 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
669 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
674 return syscm_scm_from_symbol (sym
);
679 /* (frame-older <gdb:frame>) -> <gdb:frame>
680 Returns the frame immediately older (outer) to this frame,
681 or #f if there isn't one. */
684 gdbscm_frame_older (SCM self
)
687 struct frame_info
*prev
= NULL
;
688 struct frame_info
*frame
= NULL
;
690 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
694 frame
= frscm_frame_smob_to_frame (f_smob
);
696 prev
= get_prev_frame (frame
);
698 CATCH (except
, RETURN_MASK_ALL
)
700 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
706 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
711 return frscm_scm_from_frame_unsafe (prev
, f_smob
->inferior
);
716 /* (frame-newer <gdb:frame>) -> <gdb:frame>
717 Returns the frame immediately newer (inner) to this frame,
718 or #f if there isn't one. */
721 gdbscm_frame_newer (SCM self
)
724 struct frame_info
*next
= NULL
;
725 struct frame_info
*frame
= NULL
;
727 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
731 frame
= frscm_frame_smob_to_frame (f_smob
);
733 next
= get_next_frame (frame
);
735 CATCH (except
, RETURN_MASK_ALL
)
737 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
743 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
748 return frscm_scm_from_frame_unsafe (next
, f_smob
->inferior
);
753 /* (frame-sal <gdb:frame>) -> <gdb:sal>
754 Returns the frame's symtab and line. */
757 gdbscm_frame_sal (SCM self
)
760 struct symtab_and_line sal
;
761 struct frame_info
*frame
= NULL
;
763 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
767 frame
= frscm_frame_smob_to_frame (f_smob
);
769 find_frame_sal (frame
, &sal
);
771 CATCH (except
, RETURN_MASK_ALL
)
773 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
779 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
783 return stscm_scm_from_sal (sal
);
786 /* (frame-read-register <gdb:frame> string) -> <gdb:value>
787 The register argument must be a string. */
790 gdbscm_frame_read_register (SCM self
, SCM register_scm
)
793 struct value
*value
= NULL
;
794 struct frame_info
*frame
= NULL
;
795 struct cleanup
*cleanup
;
798 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
799 gdbscm_parse_function_args (FUNC_NAME
, SCM_ARG2
, NULL
, "s",
800 register_scm
, ®ister_str
);
801 cleanup
= make_cleanup (xfree
, register_str
);
807 frame
= frscm_frame_smob_to_frame (f_smob
);
810 regnum
= user_reg_map_name_to_regnum (get_frame_arch (frame
),
812 strlen (register_str
));
814 value
= value_of_register (regnum
, frame
);
817 CATCH (except
, RETURN_MASK_ALL
)
819 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
823 do_cleanups (cleanup
);
827 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
833 gdbscm_out_of_range_error (FUNC_NAME
, SCM_ARG2
, register_scm
,
834 _("unknown register"));
837 return vlscm_scm_from_value (value
);
840 /* (frame-read-var <gdb:frame> <gdb:symbol>) -> <gdb:value>
841 (frame-read-var <gdb:frame> string [#:block <gdb:block>]) -> <gdb:value>
842 If the optional block argument is provided start the search from that block,
843 otherwise search from the frame's current block (determined by examining
844 the resume address of the frame). The variable argument must be a string
845 or an instance of a <gdb:symbol>. The block argument must be an instance of
849 gdbscm_frame_read_var (SCM self
, SCM symbol_scm
, SCM rest
)
851 SCM keywords
[] = { block_keyword
, SCM_BOOL_F
};
854 int block_arg_pos
= -1;
855 SCM block_scm
= SCM_UNDEFINED
;
856 struct frame_info
*frame
= NULL
;
857 struct symbol
*var
= NULL
;
858 const struct block
*block
= NULL
;
859 struct value
*value
= NULL
;
861 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
865 frame
= frscm_frame_smob_to_frame (f_smob
);
867 CATCH (except
, RETURN_MASK_ALL
)
869 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
875 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
879 gdbscm_parse_function_args (FUNC_NAME
, SCM_ARG3
, keywords
, "#O",
880 rest
, &block_arg_pos
, &block_scm
);
882 if (syscm_is_symbol (symbol_scm
))
884 var
= syscm_get_valid_symbol_arg_unsafe (symbol_scm
, SCM_ARG2
,
886 SCM_ASSERT (SCM_UNBNDP (block_scm
), block_scm
, SCM_ARG3
, FUNC_NAME
);
888 else if (scm_is_string (symbol_scm
))
891 const struct block
*block
= NULL
;
892 struct cleanup
*cleanup
;
893 struct gdb_exception except
= exception_none
;
895 if (! SCM_UNBNDP (block_scm
))
899 gdb_assert (block_arg_pos
> 0);
900 block
= bkscm_scm_to_block (block_scm
, block_arg_pos
, FUNC_NAME
,
903 gdbscm_throw (except_scm
);
906 var_name
= gdbscm_scm_to_c_string (symbol_scm
);
907 cleanup
= make_cleanup (xfree
, var_name
);
908 /* N.B. Between here and the call to do_cleanups, don't do anything
909 to cause a Scheme exception without performing the cleanup. */
913 struct block_symbol lookup_sym
;
916 block
= get_frame_block (frame
, NULL
);
917 lookup_sym
= lookup_symbol (var_name
, block
, VAR_DOMAIN
, NULL
);
918 var
= lookup_sym
.symbol
;
919 block
= lookup_sym
.block
;
921 CATCH (ex
, RETURN_MASK_ALL
)
927 do_cleanups (cleanup
);
928 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
932 do_cleanups (cleanup
);
933 gdbscm_out_of_range_error (FUNC_NAME
, 0, symbol_scm
,
934 _("variable not found"));
937 do_cleanups (cleanup
);
941 /* Use SCM_ASSERT_TYPE for more consistent error messages. */
942 SCM_ASSERT_TYPE (0, symbol_scm
, SCM_ARG1
, FUNC_NAME
,
943 _("gdb:symbol or string"));
948 value
= read_var_value (var
, block
, frame
);
950 CATCH (except
, RETURN_MASK_ALL
)
952 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
956 return vlscm_scm_from_value (value
);
959 /* (frame-select <gdb:frame>) -> unspecified
960 Select this frame. */
963 gdbscm_frame_select (SCM self
)
966 struct frame_info
*frame
= NULL
;
968 f_smob
= frscm_get_frame_smob_arg_unsafe (self
, SCM_ARG1
, FUNC_NAME
);
972 frame
= frscm_frame_smob_to_frame (f_smob
);
974 select_frame (frame
);
976 CATCH (except
, RETURN_MASK_ALL
)
978 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
984 gdbscm_invalid_object_error (FUNC_NAME
, SCM_ARG1
, self
,
988 return SCM_UNSPECIFIED
;
991 /* (newest-frame) -> <gdb:frame>
992 Returns the newest frame. */
995 gdbscm_newest_frame (void)
997 struct frame_info
*frame
= NULL
;
1001 frame
= get_current_frame ();
1003 CATCH (except
, RETURN_MASK_ALL
)
1005 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
1009 return frscm_scm_from_frame_unsafe (frame
, current_inferior ());
1012 /* (selected-frame) -> <gdb:frame>
1013 Returns the selected frame. */
1016 gdbscm_selected_frame (void)
1018 struct frame_info
*frame
= NULL
;
1022 frame
= get_selected_frame (_("No frame is currently selected"));
1024 CATCH (except
, RETURN_MASK_ALL
)
1026 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
1030 return frscm_scm_from_frame_unsafe (frame
, current_inferior ());
1033 /* (unwind-stop-reason-string integer) -> string
1034 Return a string explaining the unwind stop reason. */
1037 gdbscm_unwind_stop_reason_string (SCM reason_scm
)
1042 gdbscm_parse_function_args (FUNC_NAME
, SCM_ARG1
, NULL
, "i",
1043 reason_scm
, &reason
);
1045 if (reason
< UNWIND_FIRST
|| reason
> UNWIND_LAST
)
1046 scm_out_of_range (FUNC_NAME
, reason_scm
);
1048 str
= unwind_stop_reason_to_string ((enum unwind_stop_reason
) reason
);
1049 return gdbscm_scm_from_c_string (str
);
1052 /* Initialize the Scheme frame support. */
1054 static const scheme_integer_constant frame_integer_constants
[] =
1056 #define ENTRY(X) { #X, X }
1058 ENTRY (NORMAL_FRAME
),
1059 ENTRY (DUMMY_FRAME
),
1060 ENTRY (INLINE_FRAME
),
1061 ENTRY (TAILCALL_FRAME
),
1062 ENTRY (SIGTRAMP_FRAME
),
1064 ENTRY (SENTINEL_FRAME
),
1068 #define SET(name, description) \
1069 { "FRAME_" #name, name },
1070 #include "unwind_stop_reasons.def"
1073 END_INTEGER_CONSTANTS
1076 static const scheme_function frame_functions
[] =
1078 { "frame?", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_p
),
1080 Return #t if the object is a <gdb:frame> object." },
1082 { "frame-valid?", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_valid_p
),
1084 Return #t if the object is a valid <gdb:frame> object.\n\
1085 Frames become invalid when the inferior returns to its caller." },
1087 { "frame-name", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_name
),
1089 Return the name of the function corresponding to this frame,\n\
1090 or #f if there is no function." },
1092 { "frame-arch", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_arch
),
1094 Return the frame's architecture as a <gdb:arch> object." },
1096 { "frame-type", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_type
),
1098 Return the frame type, namely one of the gdb:*_FRAME constants." },
1100 { "frame-unwind-stop-reason", 1, 0, 0,
1101 as_a_scm_t_subr (gdbscm_frame_unwind_stop_reason
),
1103 Return one of the gdb:FRAME_UNWIND_* constants explaining why\n\
1104 it's not possible to find frames older than this." },
1106 { "frame-pc", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_pc
),
1108 Return the frame's resume address." },
1110 { "frame-block", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_block
),
1112 Return the frame's code block, or #f if one cannot be found." },
1114 { "frame-function", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_function
),
1116 Return the <gdb:symbol> for the function corresponding to this frame,\n\
1117 or #f if there isn't one." },
1119 { "frame-older", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_older
),
1121 Return the frame immediately older (outer) to this frame,\n\
1122 or #f if there isn't one." },
1124 { "frame-newer", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_newer
),
1126 Return the frame immediately newer (inner) to this frame,\n\
1127 or #f if there isn't one." },
1129 { "frame-sal", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_sal
),
1131 Return the frame's symtab-and-line <gdb:sal> object." },
1133 { "frame-read-var", 2, 0, 1, as_a_scm_t_subr (gdbscm_frame_read_var
),
1135 Return the value of the symbol in the frame.\n\
1137 Arguments: <gdb:frame> <gdb:symbol>\n\
1138 Or: <gdb:frame> string [#:block <gdb:block>]" },
1140 { "frame-read-register", 2, 0, 0,
1141 as_a_scm_t_subr (gdbscm_frame_read_register
),
1143 Return the value of the register in the frame.\n\
1145 Arguments: <gdb:frame> string" },
1147 { "frame-select", 1, 0, 0, as_a_scm_t_subr (gdbscm_frame_select
),
1149 Select this frame." },
1151 { "newest-frame", 0, 0, 0, as_a_scm_t_subr (gdbscm_newest_frame
),
1153 Return the newest frame." },
1155 { "selected-frame", 0, 0, 0, as_a_scm_t_subr (gdbscm_selected_frame
),
1157 Return the selected frame." },
1159 { "unwind-stop-reason-string", 1, 0, 0,
1160 as_a_scm_t_subr (gdbscm_unwind_stop_reason_string
),
1162 Return a string explaining the unwind stop reason.\n\
1164 Arguments: integer (the result of frame-unwind-stop-reason)" },
1170 gdbscm_initialize_frames (void)
1173 = gdbscm_make_smob_type (frame_smob_name
, sizeof (frame_smob
));
1174 scm_set_smob_free (frame_smob_tag
, frscm_free_frame_smob
);
1175 scm_set_smob_print (frame_smob_tag
, frscm_print_frame_smob
);
1177 gdbscm_define_integer_constants (frame_integer_constants
, 1);
1178 gdbscm_define_functions (frame_functions
, 1);
1180 block_keyword
= scm_from_latin1_keyword ("block");
1182 /* Register an inferior "free" callback so we can properly
1183 invalidate frames when an inferior file is about to be deleted. */
1184 frscm_inferior_data_key
1185 = register_inferior_data_with_cleanup (NULL
, frscm_del_inferior_frames
);