1 /* Implementation of the GDB variable objects API.
3 Copyright (C) 1999-2015 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "expression.h"
26 #include "gdb_regex.h"
30 #include "gdbthread.h"
32 #include "varobj-iter.h"
35 #include "python/python.h"
36 #include "python/python-internal.h"
41 /* Non-zero if we want to see trace of varobj level stuff. */
43 unsigned int varobjdebug
= 0;
45 show_varobjdebug (struct ui_file
*file
, int from_tty
,
46 struct cmd_list_element
*c
, const char *value
)
48 fprintf_filtered (file
, _("Varobj debugging is %s.\n"), value
);
51 /* String representations of gdb's format codes. */
52 char *varobj_format_string
[] =
53 { "natural", "binary", "decimal", "hexadecimal", "octal" };
55 /* True if we want to allow Python-based pretty-printing. */
56 static int pretty_printing
= 0;
59 varobj_enable_pretty_printing (void)
66 /* Every root variable has one of these structures saved in its
67 varobj. Members which must be free'd are noted. */
71 /* Alloc'd expression for this parent. */
72 struct expression
*exp
;
74 /* Block for which this expression is valid. */
75 const struct block
*valid_block
;
77 /* The frame for this expression. This field is set iff valid_block is
79 struct frame_id frame
;
81 /* The thread ID that this varobj_root belong to. This field
82 is only valid if valid_block is not NULL.
83 When not 0, indicates which thread 'frame' belongs to.
84 When 0, indicates that the thread list was empty when the varobj_root
88 /* If 1, the -var-update always recomputes the value in the
89 current thread and frame. Otherwise, variable object is
90 always updated in the specific scope/thread/frame. */
93 /* Flag that indicates validity: set to 0 when this varobj_root refers
94 to symbols that do not exist anymore. */
97 /* Language-related operations for this variable and its
99 const struct lang_varobj_ops
*lang_ops
;
101 /* The varobj for this root node. */
102 struct varobj
*rootvar
;
104 /* Next root variable */
105 struct varobj_root
*next
;
108 /* Dynamic part of varobj. */
110 struct varobj_dynamic
112 /* Whether the children of this varobj were requested. This field is
113 used to decide if dynamic varobj should recompute their children.
114 In the event that the frontend never asked for the children, we
116 int children_requested
;
118 /* The pretty-printer constructor. If NULL, then the default
119 pretty-printer will be looked up. If None, then no
120 pretty-printer will be installed. */
121 PyObject
*constructor
;
123 /* The pretty-printer that has been constructed. If NULL, then a
124 new printer object is needed, and one will be constructed. */
125 PyObject
*pretty_printer
;
127 /* The iterator returned by the printer's 'children' method, or NULL
129 struct varobj_iter
*child_iter
;
131 /* We request one extra item from the iterator, so that we can
132 report to the caller whether there are more items than we have
133 already reported. However, we don't want to install this value
134 when we read it, because that will mess up future updates. So,
135 we stash it here instead. */
136 varobj_item
*saved_item
;
142 struct cpstack
*next
;
145 /* A list of varobjs */
153 /* Private function prototypes */
155 /* Helper functions for the above subcommands. */
157 static int delete_variable (struct cpstack
**, struct varobj
*, int);
159 static void delete_variable_1 (struct cpstack
**, int *,
160 struct varobj
*, int, int);
162 static int install_variable (struct varobj
*);
164 static void uninstall_variable (struct varobj
*);
166 static struct varobj
*create_child (struct varobj
*, int, char *);
168 static struct varobj
*
169 create_child_with_value (struct varobj
*parent
, int index
,
170 struct varobj_item
*item
);
172 /* Utility routines */
174 static struct varobj
*new_variable (void);
176 static struct varobj
*new_root_variable (void);
178 static void free_variable (struct varobj
*var
);
180 static struct cleanup
*make_cleanup_free_variable (struct varobj
*var
);
182 static enum varobj_display_formats
variable_default_display (struct varobj
*);
184 static void cppush (struct cpstack
**pstack
, char *name
);
186 static char *cppop (struct cpstack
**pstack
);
188 static int update_type_if_necessary (struct varobj
*var
,
189 struct value
*new_value
);
191 static int install_new_value (struct varobj
*var
, struct value
*value
,
194 /* Language-specific routines. */
196 static int number_of_children (struct varobj
*);
198 static char *name_of_variable (struct varobj
*);
200 static char *name_of_child (struct varobj
*, int);
202 static struct value
*value_of_root (struct varobj
**var_handle
, int *);
204 static struct value
*value_of_child (struct varobj
*parent
, int index
);
206 static char *my_value_of_variable (struct varobj
*var
,
207 enum varobj_display_formats format
);
209 static int is_root_p (struct varobj
*var
);
211 static struct varobj
*varobj_add_child (struct varobj
*var
,
212 struct varobj_item
*item
);
216 /* Mappings of varobj_display_formats enums to gdb's format codes. */
217 static int format_code
[] = { 0, 't', 'd', 'x', 'o' };
219 /* Header of the list of root variable objects. */
220 static struct varobj_root
*rootlist
;
222 /* Prime number indicating the number of buckets in the hash table. */
223 /* A prime large enough to avoid too many colisions. */
224 #define VAROBJ_TABLE_SIZE 227
226 /* Pointer to the varobj hash table (built at run time). */
227 static struct vlist
**varobj_table
;
231 /* API Implementation */
233 is_root_p (struct varobj
*var
)
235 return (var
->root
->rootvar
== var
);
239 /* Helper function to install a Python environment suitable for
240 use during operations on VAR. */
242 varobj_ensure_python_env (struct varobj
*var
)
244 return ensure_python_env (var
->root
->exp
->gdbarch
,
245 var
->root
->exp
->language_defn
);
249 /* Creates a varobj (not its children). */
251 /* Return the full FRAME which corresponds to the given CORE_ADDR
252 or NULL if no FRAME on the chain corresponds to CORE_ADDR. */
254 static struct frame_info
*
255 find_frame_addr_in_frame_chain (CORE_ADDR frame_addr
)
257 struct frame_info
*frame
= NULL
;
259 if (frame_addr
== (CORE_ADDR
) 0)
262 for (frame
= get_current_frame ();
264 frame
= get_prev_frame (frame
))
266 /* The CORE_ADDR we get as argument was parsed from a string GDB
267 output as $fp. This output got truncated to gdbarch_addr_bit.
268 Truncate the frame base address in the same manner before
269 comparing it against our argument. */
270 CORE_ADDR frame_base
= get_frame_base_address (frame
);
271 int addr_bit
= gdbarch_addr_bit (get_frame_arch (frame
));
273 if (addr_bit
< (sizeof (CORE_ADDR
) * HOST_CHAR_BIT
))
274 frame_base
&= ((CORE_ADDR
) 1 << addr_bit
) - 1;
276 if (frame_base
== frame_addr
)
284 varobj_create (char *objname
,
285 char *expression
, CORE_ADDR frame
, enum varobj_type type
)
288 struct cleanup
*old_chain
;
290 /* Fill out a varobj structure for the (root) variable being constructed. */
291 var
= new_root_variable ();
292 old_chain
= make_cleanup_free_variable (var
);
294 if (expression
!= NULL
)
296 struct frame_info
*fi
;
297 struct frame_id old_id
= null_frame_id
;
298 const struct block
*block
;
300 struct value
*value
= NULL
;
301 volatile struct gdb_exception except
;
304 /* Parse and evaluate the expression, filling in as much of the
305 variable's data as possible. */
307 if (has_stack_frames ())
309 /* Allow creator to specify context of variable. */
310 if ((type
== USE_CURRENT_FRAME
) || (type
== USE_SELECTED_FRAME
))
311 fi
= get_selected_frame (NULL
);
313 /* FIXME: cagney/2002-11-23: This code should be doing a
314 lookup using the frame ID and not just the frame's
315 ``address''. This, of course, means an interface
316 change. However, with out that interface change ISAs,
317 such as the ia64 with its two stacks, won't work.
318 Similar goes for the case where there is a frameless
320 fi
= find_frame_addr_in_frame_chain (frame
);
325 /* frame = -2 means always use selected frame. */
326 if (type
== USE_SELECTED_FRAME
)
327 var
->root
->floating
= 1;
333 block
= get_frame_block (fi
, 0);
334 pc
= get_frame_pc (fi
);
338 innermost_block
= NULL
;
339 /* Wrap the call to parse expression, so we can
340 return a sensible error. */
341 TRY_CATCH (except
, RETURN_MASK_ERROR
)
343 var
->root
->exp
= parse_exp_1 (&p
, pc
, block
, 0);
346 if (except
.reason
< 0)
348 do_cleanups (old_chain
);
352 /* Don't allow variables to be created for types. */
353 if (var
->root
->exp
->elts
[0].opcode
== OP_TYPE
354 || var
->root
->exp
->elts
[0].opcode
== OP_TYPEOF
355 || var
->root
->exp
->elts
[0].opcode
== OP_DECLTYPE
)
357 do_cleanups (old_chain
);
358 fprintf_unfiltered (gdb_stderr
, "Attempt to use a type name"
359 " as an expression.\n");
363 var
->format
= variable_default_display (var
);
364 var
->root
->valid_block
= innermost_block
;
365 var
->name
= xstrdup (expression
);
366 /* For a root var, the name and the expr are the same. */
367 var
->path_expr
= xstrdup (expression
);
369 /* When the frame is different from the current frame,
370 we must select the appropriate frame before parsing
371 the expression, otherwise the value will not be current.
372 Since select_frame is so benign, just call it for all cases. */
375 /* User could specify explicit FRAME-ADDR which was not found but
376 EXPRESSION is frame specific and we would not be able to evaluate
377 it correctly next time. With VALID_BLOCK set we must also set
378 FRAME and THREAD_ID. */
380 error (_("Failed to find the specified frame"));
382 var
->root
->frame
= get_frame_id (fi
);
383 var
->root
->thread_id
= pid_to_thread_id (inferior_ptid
);
384 old_id
= get_frame_id (get_selected_frame (NULL
));
388 /* We definitely need to catch errors here.
389 If evaluate_expression succeeds we got the value we wanted.
390 But if it fails, we still go on with a call to evaluate_type(). */
391 TRY_CATCH (except
, RETURN_MASK_ERROR
)
393 value
= evaluate_expression (var
->root
->exp
);
396 if (except
.reason
< 0)
398 /* Error getting the value. Try to at least get the
400 struct value
*type_only_value
= evaluate_type (var
->root
->exp
);
402 var
->type
= value_type (type_only_value
);
406 int real_type_found
= 0;
408 var
->type
= value_actual_type (value
, 0, &real_type_found
);
410 value
= value_cast (var
->type
, value
);
413 /* Set language info */
414 var
->root
->lang_ops
= var
->root
->exp
->language_defn
->la_varobj_ops
;
416 install_new_value (var
, value
, 1 /* Initial assignment */);
418 /* Set ourselves as our root. */
419 var
->root
->rootvar
= var
;
421 /* Reset the selected frame. */
422 if (frame_id_p (old_id
))
423 select_frame (frame_find_by_id (old_id
));
426 /* If the variable object name is null, that means this
427 is a temporary variable, so don't install it. */
429 if ((var
!= NULL
) && (objname
!= NULL
))
431 var
->obj_name
= xstrdup (objname
);
433 /* If a varobj name is duplicated, the install will fail so
435 if (!install_variable (var
))
437 do_cleanups (old_chain
);
442 discard_cleanups (old_chain
);
446 /* Generates an unique name that can be used for a varobj. */
449 varobj_gen_name (void)
454 /* Generate a name for this object. */
456 obj_name
= xstrprintf ("var%d", id
);
461 /* Given an OBJNAME, returns the pointer to the corresponding varobj. Call
462 error if OBJNAME cannot be found. */
465 varobj_get_handle (char *objname
)
469 unsigned int index
= 0;
472 for (chp
= objname
; *chp
; chp
++)
474 index
= (index
+ (i
++ * (unsigned int) *chp
)) % VAROBJ_TABLE_SIZE
;
477 cv
= *(varobj_table
+ index
);
478 while ((cv
!= NULL
) && (strcmp (cv
->var
->obj_name
, objname
) != 0))
482 error (_("Variable object not found"));
487 /* Given the handle, return the name of the object. */
490 varobj_get_objname (struct varobj
*var
)
492 return var
->obj_name
;
495 /* Given the handle, return the expression represented by the object. The
496 result must be freed by the caller. */
499 varobj_get_expression (struct varobj
*var
)
501 return name_of_variable (var
);
504 /* Deletes a varobj and all its children if only_children == 0,
505 otherwise deletes only the children; returns a malloc'ed list of
506 all the (malloc'ed) names of the variables that have been deleted
507 (NULL terminated). */
510 varobj_delete (struct varobj
*var
, char ***dellist
, int only_children
)
514 struct cpstack
*result
= NULL
;
517 /* Initialize a stack for temporary results. */
518 cppush (&result
, NULL
);
521 /* Delete only the variable children. */
522 delcount
= delete_variable (&result
, var
, 1 /* only the children */ );
524 /* Delete the variable and all its children. */
525 delcount
= delete_variable (&result
, var
, 0 /* parent+children */ );
527 /* We may have been asked to return a list of what has been deleted. */
530 *dellist
= xmalloc ((delcount
+ 1) * sizeof (char *));
534 *cp
= cppop (&result
);
535 while ((*cp
!= NULL
) && (mycount
> 0))
539 *cp
= cppop (&result
);
542 if (mycount
|| (*cp
!= NULL
))
543 warning (_("varobj_delete: assertion failed - mycount(=%d) <> 0"),
552 /* Convenience function for varobj_set_visualizer. Instantiate a
553 pretty-printer for a given value. */
555 instantiate_pretty_printer (PyObject
*constructor
, struct value
*value
)
557 PyObject
*val_obj
= NULL
;
560 val_obj
= value_to_value_object (value
);
564 printer
= PyObject_CallFunctionObjArgs (constructor
, val_obj
, NULL
);
571 /* Set/Get variable object display format. */
573 enum varobj_display_formats
574 varobj_set_display_format (struct varobj
*var
,
575 enum varobj_display_formats format
)
582 case FORMAT_HEXADECIMAL
:
584 var
->format
= format
;
588 var
->format
= variable_default_display (var
);
591 if (varobj_value_is_changeable_p (var
)
592 && var
->value
&& !value_lazy (var
->value
))
594 xfree (var
->print_value
);
595 var
->print_value
= varobj_value_get_print_value (var
->value
,
602 enum varobj_display_formats
603 varobj_get_display_format (struct varobj
*var
)
609 varobj_get_display_hint (struct varobj
*var
)
614 struct cleanup
*back_to
;
616 if (!gdb_python_initialized
)
619 back_to
= varobj_ensure_python_env (var
);
621 if (var
->dynamic
->pretty_printer
!= NULL
)
622 result
= gdbpy_get_display_hint (var
->dynamic
->pretty_printer
);
624 do_cleanups (back_to
);
630 /* Return true if the varobj has items after TO, false otherwise. */
633 varobj_has_more (struct varobj
*var
, int to
)
635 if (VEC_length (varobj_p
, var
->children
) > to
)
637 return ((to
== -1 || VEC_length (varobj_p
, var
->children
) == to
)
638 && (var
->dynamic
->saved_item
!= NULL
));
641 /* If the variable object is bound to a specific thread, that
642 is its evaluation can always be done in context of a frame
643 inside that thread, returns GDB id of the thread -- which
644 is always positive. Otherwise, returns -1. */
646 varobj_get_thread_id (struct varobj
*var
)
648 if (var
->root
->valid_block
&& var
->root
->thread_id
> 0)
649 return var
->root
->thread_id
;
655 varobj_set_frozen (struct varobj
*var
, int frozen
)
657 /* When a variable is unfrozen, we don't fetch its value.
658 The 'not_fetched' flag remains set, so next -var-update
661 We don't fetch the value, because for structures the client
662 should do -var-update anyway. It would be bad to have different
663 client-size logic for structure and other types. */
664 var
->frozen
= frozen
;
668 varobj_get_frozen (struct varobj
*var
)
673 /* A helper function that restricts a range to what is actually
674 available in a VEC. This follows the usual rules for the meaning
675 of FROM and TO -- if either is negative, the entire range is
679 varobj_restrict_range (VEC (varobj_p
) *children
, int *from
, int *to
)
681 if (*from
< 0 || *to
< 0)
684 *to
= VEC_length (varobj_p
, children
);
688 if (*from
> VEC_length (varobj_p
, children
))
689 *from
= VEC_length (varobj_p
, children
);
690 if (*to
> VEC_length (varobj_p
, children
))
691 *to
= VEC_length (varobj_p
, children
);
697 /* A helper for update_dynamic_varobj_children that installs a new
698 child when needed. */
701 install_dynamic_child (struct varobj
*var
,
702 VEC (varobj_p
) **changed
,
703 VEC (varobj_p
) **type_changed
,
704 VEC (varobj_p
) **new,
705 VEC (varobj_p
) **unchanged
,
708 struct varobj_item
*item
)
710 if (VEC_length (varobj_p
, var
->children
) < index
+ 1)
712 /* There's no child yet. */
713 struct varobj
*child
= varobj_add_child (var
, item
);
717 VEC_safe_push (varobj_p
, *new, child
);
723 varobj_p existing
= VEC_index (varobj_p
, var
->children
, index
);
724 int type_updated
= update_type_if_necessary (existing
, item
->value
);
729 VEC_safe_push (varobj_p
, *type_changed
, existing
);
731 if (install_new_value (existing
, item
->value
, 0))
733 if (!type_updated
&& changed
)
734 VEC_safe_push (varobj_p
, *changed
, existing
);
736 else if (!type_updated
&& unchanged
)
737 VEC_safe_push (varobj_p
, *unchanged
, existing
);
744 dynamic_varobj_has_child_method (struct varobj
*var
)
746 struct cleanup
*back_to
;
747 PyObject
*printer
= var
->dynamic
->pretty_printer
;
750 if (!gdb_python_initialized
)
753 back_to
= varobj_ensure_python_env (var
);
754 result
= PyObject_HasAttr (printer
, gdbpy_children_cst
);
755 do_cleanups (back_to
);
760 /* A factory for creating dynamic varobj's iterators. Returns an
761 iterator object suitable for iterating over VAR's children. */
763 static struct varobj_iter
*
764 varobj_get_iterator (struct varobj
*var
)
767 if (var
->dynamic
->pretty_printer
)
768 return py_varobj_get_iterator (var
, var
->dynamic
->pretty_printer
);
771 gdb_assert_not_reached (_("\
772 requested an iterator from a non-dynamic varobj"));
775 /* Release and clear VAR's saved item, if any. */
778 varobj_clear_saved_item (struct varobj_dynamic
*var
)
780 if (var
->saved_item
!= NULL
)
782 value_free (var
->saved_item
->value
);
783 xfree (var
->saved_item
);
784 var
->saved_item
= NULL
;
789 update_dynamic_varobj_children (struct varobj
*var
,
790 VEC (varobj_p
) **changed
,
791 VEC (varobj_p
) **type_changed
,
792 VEC (varobj_p
) **new,
793 VEC (varobj_p
) **unchanged
,
803 if (update_children
|| var
->dynamic
->child_iter
== NULL
)
805 varobj_iter_delete (var
->dynamic
->child_iter
);
806 var
->dynamic
->child_iter
= varobj_get_iterator (var
);
808 varobj_clear_saved_item (var
->dynamic
);
812 if (var
->dynamic
->child_iter
== NULL
)
816 i
= VEC_length (varobj_p
, var
->children
);
818 /* We ask for one extra child, so that MI can report whether there
819 are more children. */
820 for (; to
< 0 || i
< to
+ 1; ++i
)
824 /* See if there was a leftover from last time. */
825 if (var
->dynamic
->saved_item
!= NULL
)
827 item
= var
->dynamic
->saved_item
;
828 var
->dynamic
->saved_item
= NULL
;
832 item
= varobj_iter_next (var
->dynamic
->child_iter
);
833 /* Release vitem->value so its lifetime is not bound to the
834 execution of a command. */
835 if (item
!= NULL
&& item
->value
!= NULL
)
836 release_value_or_incref (item
->value
);
841 /* Iteration is done. Remove iterator from VAR. */
842 varobj_iter_delete (var
->dynamic
->child_iter
);
843 var
->dynamic
->child_iter
= NULL
;
846 /* We don't want to push the extra child on any report list. */
847 if (to
< 0 || i
< to
)
849 int can_mention
= from
< 0 || i
>= from
;
851 install_dynamic_child (var
, can_mention
? changed
: NULL
,
852 can_mention
? type_changed
: NULL
,
853 can_mention
? new : NULL
,
854 can_mention
? unchanged
: NULL
,
855 can_mention
? cchanged
: NULL
, i
,
862 var
->dynamic
->saved_item
= item
;
864 /* We want to truncate the child list just before this
870 if (i
< VEC_length (varobj_p
, var
->children
))
875 for (j
= i
; j
< VEC_length (varobj_p
, var
->children
); ++j
)
876 varobj_delete (VEC_index (varobj_p
, var
->children
, j
), NULL
, 0);
877 VEC_truncate (varobj_p
, var
->children
, i
);
880 /* If there are fewer children than requested, note that the list of
882 if (to
>= 0 && VEC_length (varobj_p
, var
->children
) < to
)
885 var
->num_children
= VEC_length (varobj_p
, var
->children
);
891 varobj_get_num_children (struct varobj
*var
)
893 if (var
->num_children
== -1)
895 if (varobj_is_dynamic_p (var
))
899 /* If we have a dynamic varobj, don't report -1 children.
900 So, try to fetch some children first. */
901 update_dynamic_varobj_children (var
, NULL
, NULL
, NULL
, NULL
, &dummy
,
905 var
->num_children
= number_of_children (var
);
908 return var
->num_children
>= 0 ? var
->num_children
: 0;
911 /* Creates a list of the immediate children of a variable object;
912 the return code is the number of such children or -1 on error. */
915 varobj_list_children (struct varobj
*var
, int *from
, int *to
)
918 int i
, children_changed
;
920 var
->dynamic
->children_requested
= 1;
922 if (varobj_is_dynamic_p (var
))
924 /* This, in theory, can result in the number of children changing without
925 frontend noticing. But well, calling -var-list-children on the same
926 varobj twice is not something a sane frontend would do. */
927 update_dynamic_varobj_children (var
, NULL
, NULL
, NULL
, NULL
,
928 &children_changed
, 0, 0, *to
);
929 varobj_restrict_range (var
->children
, from
, to
);
930 return var
->children
;
933 if (var
->num_children
== -1)
934 var
->num_children
= number_of_children (var
);
936 /* If that failed, give up. */
937 if (var
->num_children
== -1)
938 return var
->children
;
940 /* If we're called when the list of children is not yet initialized,
941 allocate enough elements in it. */
942 while (VEC_length (varobj_p
, var
->children
) < var
->num_children
)
943 VEC_safe_push (varobj_p
, var
->children
, NULL
);
945 for (i
= 0; i
< var
->num_children
; i
++)
947 varobj_p existing
= VEC_index (varobj_p
, var
->children
, i
);
949 if (existing
== NULL
)
951 /* Either it's the first call to varobj_list_children for
952 this variable object, and the child was never created,
953 or it was explicitly deleted by the client. */
954 name
= name_of_child (var
, i
);
955 existing
= create_child (var
, i
, name
);
956 VEC_replace (varobj_p
, var
->children
, i
, existing
);
960 varobj_restrict_range (var
->children
, from
, to
);
961 return var
->children
;
964 static struct varobj
*
965 varobj_add_child (struct varobj
*var
, struct varobj_item
*item
)
967 varobj_p v
= create_child_with_value (var
,
968 VEC_length (varobj_p
, var
->children
),
971 VEC_safe_push (varobj_p
, var
->children
, v
);
975 /* Obtain the type of an object Variable as a string similar to the one gdb
976 prints on the console. The caller is responsible for freeing the string.
980 varobj_get_type (struct varobj
*var
)
982 /* For the "fake" variables, do not return a type. (Its type is
984 Do not return a type for invalid variables as well. */
985 if (CPLUS_FAKE_CHILD (var
) || !var
->root
->is_valid
)
988 return type_to_string (var
->type
);
991 /* Obtain the type of an object variable. */
994 varobj_get_gdb_type (struct varobj
*var
)
999 /* Is VAR a path expression parent, i.e., can it be used to construct
1000 a valid path expression? */
1003 is_path_expr_parent (struct varobj
*var
)
1005 gdb_assert (var
->root
->lang_ops
->is_path_expr_parent
!= NULL
);
1006 return var
->root
->lang_ops
->is_path_expr_parent (var
);
1009 /* Is VAR a path expression parent, i.e., can it be used to construct
1010 a valid path expression? By default we assume any VAR can be a path
1014 varobj_default_is_path_expr_parent (struct varobj
*var
)
1019 /* Return the path expression parent for VAR. */
1022 varobj_get_path_expr_parent (struct varobj
*var
)
1024 struct varobj
*parent
= var
;
1026 while (!is_root_p (parent
) && !is_path_expr_parent (parent
))
1027 parent
= parent
->parent
;
1032 /* Return a pointer to the full rooted expression of varobj VAR.
1033 If it has not been computed yet, compute it. */
1035 varobj_get_path_expr (struct varobj
*var
)
1037 if (var
->path_expr
!= NULL
)
1038 return var
->path_expr
;
1041 /* For root varobjs, we initialize path_expr
1042 when creating varobj, so here it should be
1044 gdb_assert (!is_root_p (var
));
1045 return (*var
->root
->lang_ops
->path_expr_of_child
) (var
);
1049 const struct language_defn
*
1050 varobj_get_language (struct varobj
*var
)
1052 return var
->root
->exp
->language_defn
;
1056 varobj_get_attributes (struct varobj
*var
)
1060 if (varobj_editable_p (var
))
1061 /* FIXME: define masks for attributes. */
1062 attributes
|= 0x00000001; /* Editable */
1067 /* Return true if VAR is a dynamic varobj. */
1070 varobj_is_dynamic_p (struct varobj
*var
)
1072 return var
->dynamic
->pretty_printer
!= NULL
;
1076 varobj_get_formatted_value (struct varobj
*var
,
1077 enum varobj_display_formats format
)
1079 return my_value_of_variable (var
, format
);
1083 varobj_get_value (struct varobj
*var
)
1085 return my_value_of_variable (var
, var
->format
);
1088 /* Set the value of an object variable (if it is editable) to the
1089 value of the given expression. */
1090 /* Note: Invokes functions that can call error(). */
1093 varobj_set_value (struct varobj
*var
, char *expression
)
1095 struct value
*val
= NULL
; /* Initialize to keep gcc happy. */
1096 /* The argument "expression" contains the variable's new value.
1097 We need to first construct a legal expression for this -- ugh! */
1098 /* Does this cover all the bases? */
1099 struct expression
*exp
;
1100 struct value
*value
= NULL
; /* Initialize to keep gcc happy. */
1101 int saved_input_radix
= input_radix
;
1102 const char *s
= expression
;
1103 volatile struct gdb_exception except
;
1105 gdb_assert (varobj_editable_p (var
));
1107 input_radix
= 10; /* ALWAYS reset to decimal temporarily. */
1108 exp
= parse_exp_1 (&s
, 0, 0, 0);
1109 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1111 value
= evaluate_expression (exp
);
1114 if (except
.reason
< 0)
1116 /* We cannot proceed without a valid expression. */
1121 /* All types that are editable must also be changeable. */
1122 gdb_assert (varobj_value_is_changeable_p (var
));
1124 /* The value of a changeable variable object must not be lazy. */
1125 gdb_assert (!value_lazy (var
->value
));
1127 /* Need to coerce the input. We want to check if the
1128 value of the variable object will be different
1129 after assignment, and the first thing value_assign
1130 does is coerce the input.
1131 For example, if we are assigning an array to a pointer variable we
1132 should compare the pointer with the array's address, not with the
1134 value
= coerce_array (value
);
1136 /* The new value may be lazy. value_assign, or
1137 rather value_contents, will take care of this. */
1138 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1140 val
= value_assign (var
->value
, value
);
1143 if (except
.reason
< 0)
1146 /* If the value has changed, record it, so that next -var-update can
1147 report this change. If a variable had a value of '1', we've set it
1148 to '333' and then set again to '1', when -var-update will report this
1149 variable as changed -- because the first assignment has set the
1150 'updated' flag. There's no need to optimize that, because return value
1151 of -var-update should be considered an approximation. */
1152 var
->updated
= install_new_value (var
, val
, 0 /* Compare values. */);
1153 input_radix
= saved_input_radix
;
1159 /* A helper function to install a constructor function and visualizer
1160 in a varobj_dynamic. */
1163 install_visualizer (struct varobj_dynamic
*var
, PyObject
*constructor
,
1164 PyObject
*visualizer
)
1166 Py_XDECREF (var
->constructor
);
1167 var
->constructor
= constructor
;
1169 Py_XDECREF (var
->pretty_printer
);
1170 var
->pretty_printer
= visualizer
;
1172 varobj_iter_delete (var
->child_iter
);
1173 var
->child_iter
= NULL
;
1176 /* Install the default visualizer for VAR. */
1179 install_default_visualizer (struct varobj
*var
)
1181 /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */
1182 if (CPLUS_FAKE_CHILD (var
))
1185 if (pretty_printing
)
1187 PyObject
*pretty_printer
= NULL
;
1191 pretty_printer
= gdbpy_get_varobj_pretty_printer (var
->value
);
1192 if (! pretty_printer
)
1194 gdbpy_print_stack ();
1195 error (_("Cannot instantiate printer for default visualizer"));
1199 if (pretty_printer
== Py_None
)
1201 Py_DECREF (pretty_printer
);
1202 pretty_printer
= NULL
;
1205 install_visualizer (var
->dynamic
, NULL
, pretty_printer
);
1209 /* Instantiate and install a visualizer for VAR using CONSTRUCTOR to
1210 make a new object. */
1213 construct_visualizer (struct varobj
*var
, PyObject
*constructor
)
1215 PyObject
*pretty_printer
;
1217 /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */
1218 if (CPLUS_FAKE_CHILD (var
))
1221 Py_INCREF (constructor
);
1222 if (constructor
== Py_None
)
1223 pretty_printer
= NULL
;
1226 pretty_printer
= instantiate_pretty_printer (constructor
, var
->value
);
1227 if (! pretty_printer
)
1229 gdbpy_print_stack ();
1230 Py_DECREF (constructor
);
1231 constructor
= Py_None
;
1232 Py_INCREF (constructor
);
1235 if (pretty_printer
== Py_None
)
1237 Py_DECREF (pretty_printer
);
1238 pretty_printer
= NULL
;
1242 install_visualizer (var
->dynamic
, constructor
, pretty_printer
);
1245 #endif /* HAVE_PYTHON */
1247 /* A helper function for install_new_value. This creates and installs
1248 a visualizer for VAR, if appropriate. */
1251 install_new_value_visualizer (struct varobj
*var
)
1254 /* If the constructor is None, then we want the raw value. If VAR
1255 does not have a value, just skip this. */
1256 if (!gdb_python_initialized
)
1259 if (var
->dynamic
->constructor
!= Py_None
&& var
->value
!= NULL
)
1261 struct cleanup
*cleanup
;
1263 cleanup
= varobj_ensure_python_env (var
);
1265 if (var
->dynamic
->constructor
== NULL
)
1266 install_default_visualizer (var
);
1268 construct_visualizer (var
, var
->dynamic
->constructor
);
1270 do_cleanups (cleanup
);
1277 /* When using RTTI to determine variable type it may be changed in runtime when
1278 the variable value is changed. This function checks whether type of varobj
1279 VAR will change when a new value NEW_VALUE is assigned and if it is so
1280 updates the type of VAR. */
1283 update_type_if_necessary (struct varobj
*var
, struct value
*new_value
)
1287 struct value_print_options opts
;
1289 get_user_print_options (&opts
);
1290 if (opts
.objectprint
)
1292 struct type
*new_type
;
1293 char *curr_type_str
, *new_type_str
;
1294 int type_name_changed
;
1296 new_type
= value_actual_type (new_value
, 0, 0);
1297 new_type_str
= type_to_string (new_type
);
1298 curr_type_str
= varobj_get_type (var
);
1299 type_name_changed
= strcmp (curr_type_str
, new_type_str
) != 0;
1300 xfree (curr_type_str
);
1301 xfree (new_type_str
);
1303 if (type_name_changed
)
1305 var
->type
= new_type
;
1307 /* This information may be not valid for a new type. */
1308 varobj_delete (var
, NULL
, 1);
1309 VEC_free (varobj_p
, var
->children
);
1310 var
->num_children
= -1;
1319 /* Assign a new value to a variable object. If INITIAL is non-zero,
1320 this is the first assignement after the variable object was just
1321 created, or changed type. In that case, just assign the value
1323 Otherwise, assign the new value, and return 1 if the value is
1324 different from the current one, 0 otherwise. The comparison is
1325 done on textual representation of value. Therefore, some types
1326 need not be compared. E.g. for structures the reported value is
1327 always "{...}", so no comparison is necessary here. If the old
1328 value was NULL and new one is not, or vice versa, we always return 1.
1330 The VALUE parameter should not be released -- the function will
1331 take care of releasing it when needed. */
1333 install_new_value (struct varobj
*var
, struct value
*value
, int initial
)
1338 int intentionally_not_fetched
= 0;
1339 char *print_value
= NULL
;
1341 /* We need to know the varobj's type to decide if the value should
1342 be fetched or not. C++ fake children (public/protected/private)
1343 don't have a type. */
1344 gdb_assert (var
->type
|| CPLUS_FAKE_CHILD (var
));
1345 changeable
= varobj_value_is_changeable_p (var
);
1347 /* If the type has custom visualizer, we consider it to be always
1348 changeable. FIXME: need to make sure this behaviour will not
1349 mess up read-sensitive values. */
1350 if (var
->dynamic
->pretty_printer
!= NULL
)
1353 need_to_fetch
= changeable
;
1355 /* We are not interested in the address of references, and given
1356 that in C++ a reference is not rebindable, it cannot
1357 meaningfully change. So, get hold of the real value. */
1359 value
= coerce_ref (value
);
1361 if (var
->type
&& TYPE_CODE (var
->type
) == TYPE_CODE_UNION
)
1362 /* For unions, we need to fetch the value implicitly because
1363 of implementation of union member fetch. When gdb
1364 creates a value for a field and the value of the enclosing
1365 structure is not lazy, it immediately copies the necessary
1366 bytes from the enclosing values. If the enclosing value is
1367 lazy, the call to value_fetch_lazy on the field will read
1368 the data from memory. For unions, that means we'll read the
1369 same memory more than once, which is not desirable. So
1373 /* The new value might be lazy. If the type is changeable,
1374 that is we'll be comparing values of this type, fetch the
1375 value now. Otherwise, on the next update the old value
1376 will be lazy, which means we've lost that old value. */
1377 if (need_to_fetch
&& value
&& value_lazy (value
))
1379 struct varobj
*parent
= var
->parent
;
1380 int frozen
= var
->frozen
;
1382 for (; !frozen
&& parent
; parent
= parent
->parent
)
1383 frozen
|= parent
->frozen
;
1385 if (frozen
&& initial
)
1387 /* For variables that are frozen, or are children of frozen
1388 variables, we don't do fetch on initial assignment.
1389 For non-initial assignemnt we do the fetch, since it means we're
1390 explicitly asked to compare the new value with the old one. */
1391 intentionally_not_fetched
= 1;
1395 volatile struct gdb_exception except
;
1397 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1399 value_fetch_lazy (value
);
1402 if (except
.reason
< 0)
1404 /* Set the value to NULL, so that for the next -var-update,
1405 we don't try to compare the new value with this value,
1406 that we couldn't even read. */
1412 /* Get a reference now, before possibly passing it to any Python
1413 code that might release it. */
1415 value_incref (value
);
1417 /* Below, we'll be comparing string rendering of old and new
1418 values. Don't get string rendering if the value is
1419 lazy -- if it is, the code above has decided that the value
1420 should not be fetched. */
1421 if (value
!= NULL
&& !value_lazy (value
)
1422 && var
->dynamic
->pretty_printer
== NULL
)
1423 print_value
= varobj_value_get_print_value (value
, var
->format
, var
);
1425 /* If the type is changeable, compare the old and the new values.
1426 If this is the initial assignment, we don't have any old value
1428 if (!initial
&& changeable
)
1430 /* If the value of the varobj was changed by -var-set-value,
1431 then the value in the varobj and in the target is the same.
1432 However, that value is different from the value that the
1433 varobj had after the previous -var-update. So need to the
1434 varobj as changed. */
1439 else if (var
->dynamic
->pretty_printer
== NULL
)
1441 /* Try to compare the values. That requires that both
1442 values are non-lazy. */
1443 if (var
->not_fetched
&& value_lazy (var
->value
))
1445 /* This is a frozen varobj and the value was never read.
1446 Presumably, UI shows some "never read" indicator.
1447 Now that we've fetched the real value, we need to report
1448 this varobj as changed so that UI can show the real
1452 else if (var
->value
== NULL
&& value
== NULL
)
1455 else if (var
->value
== NULL
|| value
== NULL
)
1461 gdb_assert (!value_lazy (var
->value
));
1462 gdb_assert (!value_lazy (value
));
1464 gdb_assert (var
->print_value
!= NULL
&& print_value
!= NULL
);
1465 if (strcmp (var
->print_value
, print_value
) != 0)
1471 if (!initial
&& !changeable
)
1473 /* For values that are not changeable, we don't compare the values.
1474 However, we want to notice if a value was not NULL and now is NULL,
1475 or vise versa, so that we report when top-level varobjs come in scope
1476 and leave the scope. */
1477 changed
= (var
->value
!= NULL
) != (value
!= NULL
);
1480 /* We must always keep the new value, since children depend on it. */
1481 if (var
->value
!= NULL
&& var
->value
!= value
)
1482 value_free (var
->value
);
1484 if (value
&& value_lazy (value
) && intentionally_not_fetched
)
1485 var
->not_fetched
= 1;
1487 var
->not_fetched
= 0;
1490 install_new_value_visualizer (var
);
1492 /* If we installed a pretty-printer, re-compare the printed version
1493 to see if the variable changed. */
1494 if (var
->dynamic
->pretty_printer
!= NULL
)
1496 xfree (print_value
);
1497 print_value
= varobj_value_get_print_value (var
->value
, var
->format
,
1499 if ((var
->print_value
== NULL
&& print_value
!= NULL
)
1500 || (var
->print_value
!= NULL
&& print_value
== NULL
)
1501 || (var
->print_value
!= NULL
&& print_value
!= NULL
1502 && strcmp (var
->print_value
, print_value
) != 0))
1505 if (var
->print_value
)
1506 xfree (var
->print_value
);
1507 var
->print_value
= print_value
;
1509 gdb_assert (!var
->value
|| value_type (var
->value
));
1514 /* Return the requested range for a varobj. VAR is the varobj. FROM
1515 and TO are out parameters; *FROM and *TO will be set to the
1516 selected sub-range of VAR. If no range was selected using
1517 -var-set-update-range, then both will be -1. */
1519 varobj_get_child_range (struct varobj
*var
, int *from
, int *to
)
1525 /* Set the selected sub-range of children of VAR to start at index
1526 FROM and end at index TO. If either FROM or TO is less than zero,
1527 this is interpreted as a request for all children. */
1529 varobj_set_child_range (struct varobj
*var
, int from
, int to
)
1536 varobj_set_visualizer (struct varobj
*var
, const char *visualizer
)
1539 PyObject
*mainmod
, *globals
, *constructor
;
1540 struct cleanup
*back_to
;
1542 if (!gdb_python_initialized
)
1545 back_to
= varobj_ensure_python_env (var
);
1547 mainmod
= PyImport_AddModule ("__main__");
1548 globals
= PyModule_GetDict (mainmod
);
1549 Py_INCREF (globals
);
1550 make_cleanup_py_decref (globals
);
1552 constructor
= PyRun_String (visualizer
, Py_eval_input
, globals
, globals
);
1556 gdbpy_print_stack ();
1557 error (_("Could not evaluate visualizer expression: %s"), visualizer
);
1560 construct_visualizer (var
, constructor
);
1561 Py_XDECREF (constructor
);
1563 /* If there are any children now, wipe them. */
1564 varobj_delete (var
, NULL
, 1 /* children only */);
1565 var
->num_children
= -1;
1567 do_cleanups (back_to
);
1569 error (_("Python support required"));
1573 /* If NEW_VALUE is the new value of the given varobj (var), return
1574 non-zero if var has mutated. In other words, if the type of
1575 the new value is different from the type of the varobj's old
1578 NEW_VALUE may be NULL, if the varobj is now out of scope. */
1581 varobj_value_has_mutated (struct varobj
*var
, struct value
*new_value
,
1582 struct type
*new_type
)
1584 /* If we haven't previously computed the number of children in var,
1585 it does not matter from the front-end's perspective whether
1586 the type has mutated or not. For all intents and purposes,
1587 it has not mutated. */
1588 if (var
->num_children
< 0)
1591 if (var
->root
->lang_ops
->value_has_mutated
)
1593 /* The varobj module, when installing new values, explicitly strips
1594 references, saying that we're not interested in those addresses.
1595 But detection of mutation happens before installing the new
1596 value, so our value may be a reference that we need to strip
1597 in order to remain consistent. */
1598 if (new_value
!= NULL
)
1599 new_value
= coerce_ref (new_value
);
1600 return var
->root
->lang_ops
->value_has_mutated (var
, new_value
, new_type
);
1606 /* Update the values for a variable and its children. This is a
1607 two-pronged attack. First, re-parse the value for the root's
1608 expression to see if it's changed. Then go all the way
1609 through its children, reconstructing them and noting if they've
1612 The EXPLICIT parameter specifies if this call is result
1613 of MI request to update this specific variable, or
1614 result of implicit -var-update *. For implicit request, we don't
1615 update frozen variables.
1617 NOTE: This function may delete the caller's varobj. If it
1618 returns TYPE_CHANGED, then it has done this and VARP will be modified
1619 to point to the new varobj. */
1621 VEC(varobj_update_result
) *
1622 varobj_update (struct varobj
**varp
, int explicit)
1624 int type_changed
= 0;
1627 VEC (varobj_update_result
) *stack
= NULL
;
1628 VEC (varobj_update_result
) *result
= NULL
;
1630 /* Frozen means frozen -- we don't check for any change in
1631 this varobj, including its going out of scope, or
1632 changing type. One use case for frozen varobjs is
1633 retaining previously evaluated expressions, and we don't
1634 want them to be reevaluated at all. */
1635 if (!explicit && (*varp
)->frozen
)
1638 if (!(*varp
)->root
->is_valid
)
1640 varobj_update_result r
= {0};
1643 r
.status
= VAROBJ_INVALID
;
1644 VEC_safe_push (varobj_update_result
, result
, &r
);
1648 if ((*varp
)->root
->rootvar
== *varp
)
1650 varobj_update_result r
= {0};
1653 r
.status
= VAROBJ_IN_SCOPE
;
1655 /* Update the root variable. value_of_root can return NULL
1656 if the variable is no longer around, i.e. we stepped out of
1657 the frame in which a local existed. We are letting the
1658 value_of_root variable dispose of the varobj if the type
1660 new = value_of_root (varp
, &type_changed
);
1661 if (update_type_if_necessary(*varp
, new))
1664 r
.type_changed
= type_changed
;
1665 if (install_new_value ((*varp
), new, type_changed
))
1669 r
.status
= VAROBJ_NOT_IN_SCOPE
;
1670 r
.value_installed
= 1;
1672 if (r
.status
== VAROBJ_NOT_IN_SCOPE
)
1674 if (r
.type_changed
|| r
.changed
)
1675 VEC_safe_push (varobj_update_result
, result
, &r
);
1679 VEC_safe_push (varobj_update_result
, stack
, &r
);
1683 varobj_update_result r
= {0};
1686 VEC_safe_push (varobj_update_result
, stack
, &r
);
1689 /* Walk through the children, reconstructing them all. */
1690 while (!VEC_empty (varobj_update_result
, stack
))
1692 varobj_update_result r
= *(VEC_last (varobj_update_result
, stack
));
1693 struct varobj
*v
= r
.varobj
;
1695 VEC_pop (varobj_update_result
, stack
);
1697 /* Update this variable, unless it's a root, which is already
1699 if (!r
.value_installed
)
1701 struct type
*new_type
;
1703 new = value_of_child (v
->parent
, v
->index
);
1704 if (update_type_if_necessary(v
, new))
1707 new_type
= value_type (new);
1709 new_type
= v
->root
->lang_ops
->type_of_child (v
->parent
, v
->index
);
1711 if (varobj_value_has_mutated (v
, new, new_type
))
1713 /* The children are no longer valid; delete them now.
1714 Report the fact that its type changed as well. */
1715 varobj_delete (v
, NULL
, 1 /* only_children */);
1716 v
->num_children
= -1;
1723 if (install_new_value (v
, new, r
.type_changed
))
1730 /* We probably should not get children of a dynamic varobj, but
1731 for which -var-list-children was never invoked. */
1732 if (varobj_is_dynamic_p (v
))
1734 VEC (varobj_p
) *changed
= 0, *type_changed
= 0, *unchanged
= 0;
1735 VEC (varobj_p
) *new = 0;
1736 int i
, children_changed
= 0;
1741 if (!v
->dynamic
->children_requested
)
1745 /* If we initially did not have potential children, but
1746 now we do, consider the varobj as changed.
1747 Otherwise, if children were never requested, consider
1748 it as unchanged -- presumably, such varobj is not yet
1749 expanded in the UI, so we need not bother getting
1751 if (!varobj_has_more (v
, 0))
1753 update_dynamic_varobj_children (v
, NULL
, NULL
, NULL
, NULL
,
1755 if (varobj_has_more (v
, 0))
1760 VEC_safe_push (varobj_update_result
, result
, &r
);
1765 /* If update_dynamic_varobj_children returns 0, then we have
1766 a non-conforming pretty-printer, so we skip it. */
1767 if (update_dynamic_varobj_children (v
, &changed
, &type_changed
, &new,
1768 &unchanged
, &children_changed
, 1,
1771 if (children_changed
|| new)
1773 r
.children_changed
= 1;
1776 /* Push in reverse order so that the first child is
1777 popped from the work stack first, and so will be
1778 added to result first. This does not affect
1779 correctness, just "nicer". */
1780 for (i
= VEC_length (varobj_p
, type_changed
) - 1; i
>= 0; --i
)
1782 varobj_p tmp
= VEC_index (varobj_p
, type_changed
, i
);
1783 varobj_update_result r
= {0};
1785 /* Type may change only if value was changed. */
1789 r
.value_installed
= 1;
1790 VEC_safe_push (varobj_update_result
, stack
, &r
);
1792 for (i
= VEC_length (varobj_p
, changed
) - 1; i
>= 0; --i
)
1794 varobj_p tmp
= VEC_index (varobj_p
, changed
, i
);
1795 varobj_update_result r
= {0};
1799 r
.value_installed
= 1;
1800 VEC_safe_push (varobj_update_result
, stack
, &r
);
1802 for (i
= VEC_length (varobj_p
, unchanged
) - 1; i
>= 0; --i
)
1804 varobj_p tmp
= VEC_index (varobj_p
, unchanged
, i
);
1808 varobj_update_result r
= {0};
1811 r
.value_installed
= 1;
1812 VEC_safe_push (varobj_update_result
, stack
, &r
);
1815 if (r
.changed
|| r
.children_changed
)
1816 VEC_safe_push (varobj_update_result
, result
, &r
);
1818 /* Free CHANGED, TYPE_CHANGED and UNCHANGED, but not NEW,
1819 because NEW has been put into the result vector. */
1820 VEC_free (varobj_p
, changed
);
1821 VEC_free (varobj_p
, type_changed
);
1822 VEC_free (varobj_p
, unchanged
);
1828 /* Push any children. Use reverse order so that the first
1829 child is popped from the work stack first, and so
1830 will be added to result first. This does not
1831 affect correctness, just "nicer". */
1832 for (i
= VEC_length (varobj_p
, v
->children
)-1; i
>= 0; --i
)
1834 varobj_p c
= VEC_index (varobj_p
, v
->children
, i
);
1836 /* Child may be NULL if explicitly deleted by -var-delete. */
1837 if (c
!= NULL
&& !c
->frozen
)
1839 varobj_update_result r
= {0};
1842 VEC_safe_push (varobj_update_result
, stack
, &r
);
1846 if (r
.changed
|| r
.type_changed
)
1847 VEC_safe_push (varobj_update_result
, result
, &r
);
1850 VEC_free (varobj_update_result
, stack
);
1856 /* Helper functions */
1859 * Variable object construction/destruction
1863 delete_variable (struct cpstack
**resultp
, struct varobj
*var
,
1864 int only_children_p
)
1868 delete_variable_1 (resultp
, &delcount
, var
,
1869 only_children_p
, 1 /* remove_from_parent_p */ );
1874 /* Delete the variable object VAR and its children. */
1875 /* IMPORTANT NOTE: If we delete a variable which is a child
1876 and the parent is not removed we dump core. It must be always
1877 initially called with remove_from_parent_p set. */
1879 delete_variable_1 (struct cpstack
**resultp
, int *delcountp
,
1880 struct varobj
*var
, int only_children_p
,
1881 int remove_from_parent_p
)
1885 /* Delete any children of this variable, too. */
1886 for (i
= 0; i
< VEC_length (varobj_p
, var
->children
); ++i
)
1888 varobj_p child
= VEC_index (varobj_p
, var
->children
, i
);
1892 if (!remove_from_parent_p
)
1893 child
->parent
= NULL
;
1894 delete_variable_1 (resultp
, delcountp
, child
, 0, only_children_p
);
1896 VEC_free (varobj_p
, var
->children
);
1898 /* if we were called to delete only the children we are done here. */
1899 if (only_children_p
)
1902 /* Otherwise, add it to the list of deleted ones and proceed to do so. */
1903 /* If the name is null, this is a temporary variable, that has not
1904 yet been installed, don't report it, it belongs to the caller... */
1905 if (var
->obj_name
!= NULL
)
1907 cppush (resultp
, xstrdup (var
->obj_name
));
1908 *delcountp
= *delcountp
+ 1;
1911 /* If this variable has a parent, remove it from its parent's list. */
1912 /* OPTIMIZATION: if the parent of this variable is also being deleted,
1913 (as indicated by remove_from_parent_p) we don't bother doing an
1914 expensive list search to find the element to remove when we are
1915 discarding the list afterwards. */
1916 if ((remove_from_parent_p
) && (var
->parent
!= NULL
))
1918 VEC_replace (varobj_p
, var
->parent
->children
, var
->index
, NULL
);
1921 if (var
->obj_name
!= NULL
)
1922 uninstall_variable (var
);
1924 /* Free memory associated with this variable. */
1925 free_variable (var
);
1928 /* Install the given variable VAR with the object name VAR->OBJ_NAME. */
1930 install_variable (struct varobj
*var
)
1933 struct vlist
*newvl
;
1935 unsigned int index
= 0;
1938 for (chp
= var
->obj_name
; *chp
; chp
++)
1940 index
= (index
+ (i
++ * (unsigned int) *chp
)) % VAROBJ_TABLE_SIZE
;
1943 cv
= *(varobj_table
+ index
);
1944 while ((cv
!= NULL
) && (strcmp (cv
->var
->obj_name
, var
->obj_name
) != 0))
1948 error (_("Duplicate variable object name"));
1950 /* Add varobj to hash table. */
1951 newvl
= xmalloc (sizeof (struct vlist
));
1952 newvl
->next
= *(varobj_table
+ index
);
1954 *(varobj_table
+ index
) = newvl
;
1956 /* If root, add varobj to root list. */
1957 if (is_root_p (var
))
1959 /* Add to list of root variables. */
1960 if (rootlist
== NULL
)
1961 var
->root
->next
= NULL
;
1963 var
->root
->next
= rootlist
;
1964 rootlist
= var
->root
;
1970 /* Unistall the object VAR. */
1972 uninstall_variable (struct varobj
*var
)
1976 struct varobj_root
*cr
;
1977 struct varobj_root
*prer
;
1979 unsigned int index
= 0;
1982 /* Remove varobj from hash table. */
1983 for (chp
= var
->obj_name
; *chp
; chp
++)
1985 index
= (index
+ (i
++ * (unsigned int) *chp
)) % VAROBJ_TABLE_SIZE
;
1988 cv
= *(varobj_table
+ index
);
1990 while ((cv
!= NULL
) && (strcmp (cv
->var
->obj_name
, var
->obj_name
) != 0))
1997 fprintf_unfiltered (gdb_stdlog
, "Deleting %s\n", var
->obj_name
);
2002 ("Assertion failed: Could not find variable object \"%s\" to delete",
2008 *(varobj_table
+ index
) = cv
->next
;
2010 prev
->next
= cv
->next
;
2014 /* If root, remove varobj from root list. */
2015 if (is_root_p (var
))
2017 /* Remove from list of root variables. */
2018 if (rootlist
== var
->root
)
2019 rootlist
= var
->root
->next
;
2024 while ((cr
!= NULL
) && (cr
->rootvar
!= var
))
2031 warning (_("Assertion failed: Could not find "
2032 "varobj \"%s\" in root list"),
2039 prer
->next
= cr
->next
;
2045 /* Create and install a child of the parent of the given name. */
2046 static struct varobj
*
2047 create_child (struct varobj
*parent
, int index
, char *name
)
2049 struct varobj_item item
;
2052 item
.value
= value_of_child (parent
, index
);
2054 return create_child_with_value (parent
, index
, &item
);
2057 static struct varobj
*
2058 create_child_with_value (struct varobj
*parent
, int index
,
2059 struct varobj_item
*item
)
2061 struct varobj
*child
;
2064 child
= new_variable ();
2066 /* NAME is allocated by caller. */
2067 child
->name
= item
->name
;
2068 child
->index
= index
;
2069 child
->parent
= parent
;
2070 child
->root
= parent
->root
;
2072 if (varobj_is_anonymous_child (child
))
2073 childs_name
= xstrprintf ("%s.%d_anonymous", parent
->obj_name
, index
);
2075 childs_name
= xstrprintf ("%s.%s", parent
->obj_name
, item
->name
);
2076 child
->obj_name
= childs_name
;
2078 install_variable (child
);
2080 /* Compute the type of the child. Must do this before
2081 calling install_new_value. */
2082 if (item
->value
!= NULL
)
2083 /* If the child had no evaluation errors, var->value
2084 will be non-NULL and contain a valid type. */
2085 child
->type
= value_actual_type (item
->value
, 0, NULL
);
2087 /* Otherwise, we must compute the type. */
2088 child
->type
= (*child
->root
->lang_ops
->type_of_child
) (child
->parent
,
2090 install_new_value (child
, item
->value
, 1);
2097 * Miscellaneous utility functions.
2100 /* Allocate memory and initialize a new variable. */
2101 static struct varobj
*
2106 var
= (struct varobj
*) xmalloc (sizeof (struct varobj
));
2108 var
->path_expr
= NULL
;
2109 var
->obj_name
= NULL
;
2113 var
->num_children
= -1;
2115 var
->children
= NULL
;
2119 var
->print_value
= NULL
;
2121 var
->not_fetched
= 0;
2123 = (struct varobj_dynamic
*) xmalloc (sizeof (struct varobj_dynamic
));
2124 var
->dynamic
->children_requested
= 0;
2127 var
->dynamic
->constructor
= 0;
2128 var
->dynamic
->pretty_printer
= 0;
2129 var
->dynamic
->child_iter
= 0;
2130 var
->dynamic
->saved_item
= 0;
2135 /* Allocate memory and initialize a new root variable. */
2136 static struct varobj
*
2137 new_root_variable (void)
2139 struct varobj
*var
= new_variable ();
2141 var
->root
= (struct varobj_root
*) xmalloc (sizeof (struct varobj_root
));
2142 var
->root
->lang_ops
= NULL
;
2143 var
->root
->exp
= NULL
;
2144 var
->root
->valid_block
= NULL
;
2145 var
->root
->frame
= null_frame_id
;
2146 var
->root
->floating
= 0;
2147 var
->root
->rootvar
= NULL
;
2148 var
->root
->is_valid
= 1;
2153 /* Free any allocated memory associated with VAR. */
2155 free_variable (struct varobj
*var
)
2158 if (var
->dynamic
->pretty_printer
!= NULL
)
2160 struct cleanup
*cleanup
= varobj_ensure_python_env (var
);
2162 Py_XDECREF (var
->dynamic
->constructor
);
2163 Py_XDECREF (var
->dynamic
->pretty_printer
);
2164 do_cleanups (cleanup
);
2168 varobj_iter_delete (var
->dynamic
->child_iter
);
2169 varobj_clear_saved_item (var
->dynamic
);
2170 value_free (var
->value
);
2172 /* Free the expression if this is a root variable. */
2173 if (is_root_p (var
))
2175 xfree (var
->root
->exp
);
2180 xfree (var
->obj_name
);
2181 xfree (var
->print_value
);
2182 xfree (var
->path_expr
);
2183 xfree (var
->dynamic
);
2188 do_free_variable_cleanup (void *var
)
2190 free_variable (var
);
2193 static struct cleanup
*
2194 make_cleanup_free_variable (struct varobj
*var
)
2196 return make_cleanup (do_free_variable_cleanup
, var
);
2199 /* Return the type of the value that's stored in VAR,
2200 or that would have being stored there if the
2201 value were accessible.
2203 This differs from VAR->type in that VAR->type is always
2204 the true type of the expession in the source language.
2205 The return value of this function is the type we're
2206 actually storing in varobj, and using for displaying
2207 the values and for comparing previous and new values.
2209 For example, top-level references are always stripped. */
2211 varobj_get_value_type (struct varobj
*var
)
2216 type
= value_type (var
->value
);
2220 type
= check_typedef (type
);
2222 if (TYPE_CODE (type
) == TYPE_CODE_REF
)
2223 type
= get_target_type (type
);
2225 type
= check_typedef (type
);
2230 /* What is the default display for this variable? We assume that
2231 everything is "natural". Any exceptions? */
2232 static enum varobj_display_formats
2233 variable_default_display (struct varobj
*var
)
2235 return FORMAT_NATURAL
;
2238 /* FIXME: The following should be generic for any pointer. */
2240 cppush (struct cpstack
**pstack
, char *name
)
2244 s
= (struct cpstack
*) xmalloc (sizeof (struct cpstack
));
2250 /* FIXME: The following should be generic for any pointer. */
2252 cppop (struct cpstack
**pstack
)
2257 if ((*pstack
)->name
== NULL
&& (*pstack
)->next
== NULL
)
2262 *pstack
= (*pstack
)->next
;
2269 * Language-dependencies
2272 /* Common entry points */
2274 /* Return the number of children for a given variable.
2275 The result of this function is defined by the language
2276 implementation. The number of children returned by this function
2277 is the number of children that the user will see in the variable
2280 number_of_children (struct varobj
*var
)
2282 return (*var
->root
->lang_ops
->number_of_children
) (var
);
2285 /* What is the expression for the root varobj VAR? Returns a malloc'd
2288 name_of_variable (struct varobj
*var
)
2290 return (*var
->root
->lang_ops
->name_of_variable
) (var
);
2293 /* What is the name of the INDEX'th child of VAR? Returns a malloc'd
2296 name_of_child (struct varobj
*var
, int index
)
2298 return (*var
->root
->lang_ops
->name_of_child
) (var
, index
);
2301 /* If frame associated with VAR can be found, switch
2302 to it and return 1. Otherwise, return 0. */
2305 check_scope (struct varobj
*var
)
2307 struct frame_info
*fi
;
2310 fi
= frame_find_by_id (var
->root
->frame
);
2315 CORE_ADDR pc
= get_frame_pc (fi
);
2317 if (pc
< BLOCK_START (var
->root
->valid_block
) ||
2318 pc
>= BLOCK_END (var
->root
->valid_block
))
2326 /* Helper function to value_of_root. */
2328 static struct value
*
2329 value_of_root_1 (struct varobj
**var_handle
)
2331 struct value
*new_val
= NULL
;
2332 struct varobj
*var
= *var_handle
;
2333 int within_scope
= 0;
2334 struct cleanup
*back_to
;
2336 /* Only root variables can be updated... */
2337 if (!is_root_p (var
))
2338 /* Not a root var. */
2341 back_to
= make_cleanup_restore_current_thread ();
2343 /* Determine whether the variable is still around. */
2344 if (var
->root
->valid_block
== NULL
|| var
->root
->floating
)
2346 else if (var
->root
->thread_id
== 0)
2348 /* The program was single-threaded when the variable object was
2349 created. Technically, it's possible that the program became
2350 multi-threaded since then, but we don't support such
2352 within_scope
= check_scope (var
);
2356 ptid_t ptid
= thread_id_to_pid (var
->root
->thread_id
);
2357 if (in_thread_list (ptid
))
2359 switch_to_thread (ptid
);
2360 within_scope
= check_scope (var
);
2366 volatile struct gdb_exception except
;
2368 /* We need to catch errors here, because if evaluate
2369 expression fails we want to just return NULL. */
2370 TRY_CATCH (except
, RETURN_MASK_ERROR
)
2372 new_val
= evaluate_expression (var
->root
->exp
);
2376 do_cleanups (back_to
);
2381 /* What is the ``struct value *'' of the root variable VAR?
2382 For floating variable object, evaluation can get us a value
2383 of different type from what is stored in varobj already. In
2385 - *type_changed will be set to 1
2386 - old varobj will be freed, and new one will be
2387 created, with the same name.
2388 - *var_handle will be set to the new varobj
2389 Otherwise, *type_changed will be set to 0. */
2390 static struct value
*
2391 value_of_root (struct varobj
**var_handle
, int *type_changed
)
2395 if (var_handle
== NULL
)
2400 /* This should really be an exception, since this should
2401 only get called with a root variable. */
2403 if (!is_root_p (var
))
2406 if (var
->root
->floating
)
2408 struct varobj
*tmp_var
;
2409 char *old_type
, *new_type
;
2411 tmp_var
= varobj_create (NULL
, var
->name
, (CORE_ADDR
) 0,
2412 USE_SELECTED_FRAME
);
2413 if (tmp_var
== NULL
)
2417 old_type
= varobj_get_type (var
);
2418 new_type
= varobj_get_type (tmp_var
);
2419 if (strcmp (old_type
, new_type
) == 0)
2421 /* The expression presently stored inside var->root->exp
2422 remembers the locations of local variables relatively to
2423 the frame where the expression was created (in DWARF location
2424 button, for example). Naturally, those locations are not
2425 correct in other frames, so update the expression. */
2427 struct expression
*tmp_exp
= var
->root
->exp
;
2429 var
->root
->exp
= tmp_var
->root
->exp
;
2430 tmp_var
->root
->exp
= tmp_exp
;
2432 varobj_delete (tmp_var
, NULL
, 0);
2437 tmp_var
->obj_name
= xstrdup (var
->obj_name
);
2438 tmp_var
->from
= var
->from
;
2439 tmp_var
->to
= var
->to
;
2440 varobj_delete (var
, NULL
, 0);
2442 install_variable (tmp_var
);
2443 *var_handle
= tmp_var
;
2456 struct value
*value
;
2458 value
= value_of_root_1 (var_handle
);
2459 if (var
->value
== NULL
|| value
== NULL
)
2461 /* For root varobj-s, a NULL value indicates a scoping issue.
2462 So, nothing to do in terms of checking for mutations. */
2464 else if (varobj_value_has_mutated (var
, value
, value_type (value
)))
2466 /* The type has mutated, so the children are no longer valid.
2467 Just delete them, and tell our caller that the type has
2469 varobj_delete (var
, NULL
, 1 /* only_children */);
2470 var
->num_children
= -1;
2479 /* What is the ``struct value *'' for the INDEX'th child of PARENT? */
2480 static struct value
*
2481 value_of_child (struct varobj
*parent
, int index
)
2483 struct value
*value
;
2485 value
= (*parent
->root
->lang_ops
->value_of_child
) (parent
, index
);
2490 /* GDB already has a command called "value_of_variable". Sigh. */
2492 my_value_of_variable (struct varobj
*var
, enum varobj_display_formats format
)
2494 if (var
->root
->is_valid
)
2496 if (var
->dynamic
->pretty_printer
!= NULL
)
2497 return varobj_value_get_print_value (var
->value
, var
->format
, var
);
2498 return (*var
->root
->lang_ops
->value_of_variable
) (var
, format
);
2505 varobj_formatted_print_options (struct value_print_options
*opts
,
2506 enum varobj_display_formats format
)
2508 get_formatted_print_options (opts
, format_code
[(int) format
]);
2509 opts
->deref_ref
= 0;
2514 varobj_value_get_print_value (struct value
*value
,
2515 enum varobj_display_formats format
,
2518 struct ui_file
*stb
;
2519 struct cleanup
*old_chain
;
2520 char *thevalue
= NULL
;
2521 struct value_print_options opts
;
2522 struct type
*type
= NULL
;
2524 char *encoding
= NULL
;
2525 struct gdbarch
*gdbarch
= NULL
;
2526 /* Initialize it just to avoid a GCC false warning. */
2527 CORE_ADDR str_addr
= 0;
2528 int string_print
= 0;
2533 stb
= mem_fileopen ();
2534 old_chain
= make_cleanup_ui_file_delete (stb
);
2536 gdbarch
= get_type_arch (value_type (value
));
2538 if (gdb_python_initialized
)
2540 PyObject
*value_formatter
= var
->dynamic
->pretty_printer
;
2542 varobj_ensure_python_env (var
);
2544 if (value_formatter
)
2546 /* First check to see if we have any children at all. If so,
2547 we simply return {...}. */
2548 if (dynamic_varobj_has_child_method (var
))
2550 do_cleanups (old_chain
);
2551 return xstrdup ("{...}");
2554 if (PyObject_HasAttr (value_formatter
, gdbpy_to_string_cst
))
2556 struct value
*replacement
;
2557 PyObject
*output
= NULL
;
2559 output
= apply_varobj_pretty_printer (value_formatter
,
2563 /* If we have string like output ... */
2566 make_cleanup_py_decref (output
);
2568 /* If this is a lazy string, extract it. For lazy
2569 strings we always print as a string, so set
2571 if (gdbpy_is_lazy_string (output
))
2573 gdbpy_extract_lazy_string (output
, &str_addr
, &type
,
2575 make_cleanup (free_current_contents
, &encoding
);
2580 /* If it is a regular (non-lazy) string, extract
2581 it and copy the contents into THEVALUE. If the
2582 hint says to print it as a string, set
2583 string_print. Otherwise just return the extracted
2584 string as a value. */
2586 char *s
= python_string_to_target_string (output
);
2592 hint
= gdbpy_get_display_hint (value_formatter
);
2595 if (!strcmp (hint
, "string"))
2601 thevalue
= xmemdup (s
, len
+ 1, len
+ 1);
2602 type
= builtin_type (gdbarch
)->builtin_char
;
2607 do_cleanups (old_chain
);
2611 make_cleanup (xfree
, thevalue
);
2614 gdbpy_print_stack ();
2617 /* If the printer returned a replacement value, set VALUE
2618 to REPLACEMENT. If there is not a replacement value,
2619 just use the value passed to this function. */
2621 value
= replacement
;
2627 varobj_formatted_print_options (&opts
, format
);
2629 /* If the THEVALUE has contents, it is a regular string. */
2631 LA_PRINT_STRING (stb
, type
, (gdb_byte
*) thevalue
, len
, encoding
, 0, &opts
);
2632 else if (string_print
)
2633 /* Otherwise, if string_print is set, and it is not a regular
2634 string, it is a lazy string. */
2635 val_print_string (type
, encoding
, str_addr
, len
, stb
, &opts
);
2637 /* All other cases. */
2638 common_val_print (value
, stb
, 0, &opts
, current_language
);
2640 thevalue
= ui_file_xstrdup (stb
, NULL
);
2642 do_cleanups (old_chain
);
2647 varobj_editable_p (struct varobj
*var
)
2651 if (!(var
->root
->is_valid
&& var
->value
&& VALUE_LVAL (var
->value
)))
2654 type
= varobj_get_value_type (var
);
2656 switch (TYPE_CODE (type
))
2658 case TYPE_CODE_STRUCT
:
2659 case TYPE_CODE_UNION
:
2660 case TYPE_CODE_ARRAY
:
2661 case TYPE_CODE_FUNC
:
2662 case TYPE_CODE_METHOD
:
2672 /* Call VAR's value_is_changeable_p language-specific callback. */
2675 varobj_value_is_changeable_p (struct varobj
*var
)
2677 return var
->root
->lang_ops
->value_is_changeable_p (var
);
2680 /* Return 1 if that varobj is floating, that is is always evaluated in the
2681 selected frame, and not bound to thread/frame. Such variable objects
2682 are created using '@' as frame specifier to -var-create. */
2684 varobj_floating_p (struct varobj
*var
)
2686 return var
->root
->floating
;
2689 /* Implement the "value_is_changeable_p" varobj callback for most
2693 varobj_default_value_is_changeable_p (struct varobj
*var
)
2698 if (CPLUS_FAKE_CHILD (var
))
2701 type
= varobj_get_value_type (var
);
2703 switch (TYPE_CODE (type
))
2705 case TYPE_CODE_STRUCT
:
2706 case TYPE_CODE_UNION
:
2707 case TYPE_CODE_ARRAY
:
2718 /* Iterate all the existing _root_ VAROBJs and call the FUNC callback for them
2719 with an arbitrary caller supplied DATA pointer. */
2722 all_root_varobjs (void (*func
) (struct varobj
*var
, void *data
), void *data
)
2724 struct varobj_root
*var_root
, *var_root_next
;
2726 /* Iterate "safely" - handle if the callee deletes its passed VAROBJ. */
2728 for (var_root
= rootlist
; var_root
!= NULL
; var_root
= var_root_next
)
2730 var_root_next
= var_root
->next
;
2732 (*func
) (var_root
->rootvar
, data
);
2736 /* Invalidate varobj VAR if it is tied to locals and re-create it if it is
2737 defined on globals. It is a helper for varobj_invalidate.
2739 This function is called after changing the symbol file, in this case the
2740 pointers to "struct type" stored by the varobj are no longer valid. All
2741 varobj must be either re-evaluated, or marked as invalid here. */
2744 varobj_invalidate_iter (struct varobj
*var
, void *unused
)
2746 /* global and floating var must be re-evaluated. */
2747 if (var
->root
->floating
|| var
->root
->valid_block
== NULL
)
2749 struct varobj
*tmp_var
;
2751 /* Try to create a varobj with same expression. If we succeed
2752 replace the old varobj, otherwise invalidate it. */
2753 tmp_var
= varobj_create (NULL
, var
->name
, (CORE_ADDR
) 0,
2755 if (tmp_var
!= NULL
)
2757 tmp_var
->obj_name
= xstrdup (var
->obj_name
);
2758 varobj_delete (var
, NULL
, 0);
2759 install_variable (tmp_var
);
2762 var
->root
->is_valid
= 0;
2764 else /* locals must be invalidated. */
2765 var
->root
->is_valid
= 0;
2768 /* Invalidate the varobjs that are tied to locals and re-create the ones that
2769 are defined on globals.
2770 Invalidated varobjs will be always printed in_scope="invalid". */
2773 varobj_invalidate (void)
2775 all_root_varobjs (varobj_invalidate_iter
, NULL
);
2778 extern void _initialize_varobj (void);
2780 _initialize_varobj (void)
2782 int sizeof_table
= sizeof (struct vlist
*) * VAROBJ_TABLE_SIZE
;
2784 varobj_table
= xmalloc (sizeof_table
);
2785 memset (varobj_table
, 0, sizeof_table
);
2787 add_setshow_zuinteger_cmd ("varobj", class_maintenance
,
2789 _("Set varobj debugging."),
2790 _("Show varobj debugging."),
2791 _("When non-zero, varobj debugging is enabled."),
2792 NULL
, show_varobjdebug
,
2793 &setdebuglist
, &showdebuglist
);