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9a9a760829
https://sourceware.org/ml/gdb-patches/2014-05/msg00383.html The MI command -var-info-path-expression currently does not handle non-anonymous structs / unions nested within other structs / unions, it will skip parts of the expression. Consider this example: ## START EXAMPLE ## $ cat ex.c #include <string.h> int main () { struct s1 { int a; }; struct ss { struct s1 x; }; struct ss an_ss; memset (&an_ss, 0, sizeof (an_ss)); return 0; } $ gcc -g -o ex.x ex.c $ gdb ex.x (gdb) break 18 Breakpoint 1 at 0x80483ba: file ex.c, line 18. (gdb) run Starting program: /home/user/ex.x Breakpoint 1, main () at ex.c:18 18 return 0; (gdb) interpreter-exec mi "-var-create an_ss * an_ss" (gdb) interpreter-exec mi "-var-list-children an_ss" ^done,numchild="1",children=[child={name="an_ss.x",exp="x",numchild="1",type="struct s1",thread-id="1"}],has_more="0" (gdb) interpreter-exec mi "-var-list-children an_ss.x" ^done,numchild="1",children=[child={name="an_ss.x.a",exp="a",numchild="0",type="int",thread-id="1"}],has_more="0" (gdb) interpreter-exec mi "-var-list-children an_ss.x.a" ^done,numchild="0",has_more="0" (gdb) interpreter-exec mi "-var-info-path-expression an_ss.x.a" ^done,path_expr="(an_ss).a" (gdb) print (an_ss).a There is no member named a. ## END EXAMPLE ## Notice that the path expression returned is wrong, and as a result the print command fails. This patch adds a new method to the varobj_ops structure called is_path_expr_parent, to allow language specific control over finding the parent varobj, the current logic becomes the C/C++ version and is extended to handle the nested cases. No other language currently uses this code, so all other languages just get a default method. With this patch, the above example now finishes like this: ## START EXAMPLE ## $ gdb ex.x (gdb) break 18 Breakpoint 1 at 0x80483ba: file ex.c, line 18. (gdb) run Starting program: /home/user/ex.x Breakpoint 1, main () at ex.c:18 18 return 0; (gdb) interpreter-exec mi "-var-list-children an_ss" ^done,numchild="1",children=[child={name="an_ss.x",exp="x",numchild="1",type="struct s1",thread-id="1"}],has_more="0" (gdb) interpreter-exec mi "-var-list-children an_ss.x" ^done,numchild="1",children=[child={name="an_ss.x.a",exp="a",numchild="0",type="int",thread-id="1"}],has_more="0" (gdb) interpreter-exec mi "-var-list-children an_ss.x.a" ^done,numchild="0",has_more="0" (gdb) interpreter-exec mi "-var-info-path-expression an_ss.x.a" ^done,path_expr="((an_ss).x).a" (gdb) print ((an_ss).x).a $1 = 0 ## END EXAMPLE ## Notice that the path expression is now correct, and the print is a success. gdb/ChangeLog: * ada-varobj.c (ada_varobj_ops): Fill in is_path_expr_parent field. * c-varobj.c (c_is_path_expr_parent): New function, moved core from varobj.c, with additional checks. (c_varobj_ops): Fill in is_path_expr_parent field. (cplus_varobj_ops): Fill in is_path_expr_parent field. * jv-varobj.c (java_varobj_ops): Fill in is_path_expr_parent field. * varobj.c (is_path_expr_parent): Call is_path_expr_parent varobj ops method. (varobj_default_is_path_expr_parent): New function. * varobj.h (lang_varobj_ops): Add is_path_expr_parent field. (varobj_default_is_path_expr_parent): Declare new function. gdb/testsuite/ChangeLog: * gdb.mi/var-cmd.c (do_nested_struct_union_tests): New function setting up test structures. (main): Call new test function. * gdb.mi/mi2-var-child.exp: Create additional breakpoint in new test function, continue into test function and walk test structures.
963 lines
24 KiB
C
963 lines
24 KiB
C
/* varobj support for C and C++.
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Copyright (C) 1999-2014 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "value.h"
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#include "varobj.h"
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#include "gdbthread.h"
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#include "valprint.h"
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static void cplus_class_num_children (struct type *type, int children[3]);
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/* The names of varobjs representing anonymous structs or unions. */
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#define ANONYMOUS_STRUCT_NAME _("<anonymous struct>")
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#define ANONYMOUS_UNION_NAME _("<anonymous union>")
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/* Does CHILD represent a child with no name? This happens when
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the child is an anonmous struct or union and it has no field name
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in its parent variable.
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This has already been determined by *_describe_child. The easiest
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thing to do is to compare the child's name with ANONYMOUS_*_NAME. */
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int
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varobj_is_anonymous_child (struct varobj *child)
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{
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return (strcmp (child->name, ANONYMOUS_STRUCT_NAME) == 0
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|| strcmp (child->name, ANONYMOUS_UNION_NAME) == 0);
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}
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/* Given the value and the type of a variable object,
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adjust the value and type to those necessary
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for getting children of the variable object.
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This includes dereferencing top-level references
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to all types and dereferencing pointers to
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structures.
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If LOOKUP_ACTUAL_TYPE is set the enclosing type of the
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value will be fetched and if it differs from static type
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the value will be casted to it.
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Both TYPE and *TYPE should be non-null. VALUE
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can be null if we want to only translate type.
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*VALUE can be null as well -- if the parent
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value is not known.
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If WAS_PTR is not NULL, set *WAS_PTR to 0 or 1
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depending on whether pointer was dereferenced
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in this function. */
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static void
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adjust_value_for_child_access (struct value **value,
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struct type **type,
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int *was_ptr,
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int lookup_actual_type)
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{
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gdb_assert (type && *type);
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if (was_ptr)
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*was_ptr = 0;
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*type = check_typedef (*type);
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/* The type of value stored in varobj, that is passed
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to us, is already supposed to be
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reference-stripped. */
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gdb_assert (TYPE_CODE (*type) != TYPE_CODE_REF);
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/* Pointers to structures are treated just like
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structures when accessing children. Don't
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dererences pointers to other types. */
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if (TYPE_CODE (*type) == TYPE_CODE_PTR)
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{
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struct type *target_type = get_target_type (*type);
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if (TYPE_CODE (target_type) == TYPE_CODE_STRUCT
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|| TYPE_CODE (target_type) == TYPE_CODE_UNION)
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{
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if (value && *value)
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{
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volatile struct gdb_exception except;
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TRY_CATCH (except, RETURN_MASK_ERROR)
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{
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*value = value_ind (*value);
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}
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if (except.reason < 0)
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*value = NULL;
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}
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*type = target_type;
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if (was_ptr)
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*was_ptr = 1;
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}
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}
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/* The 'get_target_type' function calls check_typedef on
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result, so we can immediately check type code. No
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need to call check_typedef here. */
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/* Access a real type of the value (if necessary and possible). */
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if (value && *value && lookup_actual_type)
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{
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struct type *enclosing_type;
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int real_type_found = 0;
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enclosing_type = value_actual_type (*value, 1, &real_type_found);
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if (real_type_found)
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{
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*type = enclosing_type;
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*value = value_cast (enclosing_type, *value);
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}
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}
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}
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/* Is VAR a path expression parent, i.e., can it be used to construct
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a valid path expression? */
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static int
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c_is_path_expr_parent (struct varobj *var)
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{
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struct type *type;
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/* "Fake" children are not path_expr parents. */
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if (CPLUS_FAKE_CHILD (var))
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return 0;
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type = varobj_get_gdb_type (var);
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/* Anonymous unions and structs are also not path_expr parents. */
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if ((TYPE_CODE (type) == TYPE_CODE_STRUCT
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|| TYPE_CODE (type) == TYPE_CODE_UNION)
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&& TYPE_NAME (type) == NULL
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&& TYPE_TAG_NAME (type) == NULL)
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{
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struct varobj *parent = var->parent;
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while (parent != NULL && CPLUS_FAKE_CHILD (parent))
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parent = parent->parent;
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if (parent != NULL)
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{
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struct type *parent_type;
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int was_ptr;
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parent_type = varobj_get_value_type (parent);
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adjust_value_for_child_access (NULL, &parent_type, &was_ptr, 0);
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if (TYPE_CODE (parent_type) == TYPE_CODE_STRUCT
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|| TYPE_CODE (parent_type) == TYPE_CODE_UNION)
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{
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const char *field_name;
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gdb_assert (var->index < TYPE_NFIELDS (parent_type));
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field_name = TYPE_FIELD_NAME (parent_type, var->index);
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return !(field_name == NULL || *field_name == '\0');
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}
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}
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return 0;
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}
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return 1;
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}
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/* C */
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static int
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c_number_of_children (struct varobj *var)
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{
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struct type *type = varobj_get_value_type (var);
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int children = 0;
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struct type *target;
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adjust_value_for_child_access (NULL, &type, NULL, 0);
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target = get_target_type (type);
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switch (TYPE_CODE (type))
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{
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case TYPE_CODE_ARRAY:
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if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (target) > 0
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&& !TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type))
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children = TYPE_LENGTH (type) / TYPE_LENGTH (target);
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else
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/* If we don't know how many elements there are, don't display
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any. */
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children = 0;
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break;
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case TYPE_CODE_STRUCT:
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case TYPE_CODE_UNION:
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children = TYPE_NFIELDS (type);
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break;
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case TYPE_CODE_PTR:
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/* The type here is a pointer to non-struct. Typically, pointers
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have one child, except for function ptrs, which have no children,
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and except for void*, as we don't know what to show.
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We can show char* so we allow it to be dereferenced. If you decide
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to test for it, please mind that a little magic is necessary to
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properly identify it: char* has TYPE_CODE == TYPE_CODE_INT and
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TYPE_NAME == "char". */
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if (TYPE_CODE (target) == TYPE_CODE_FUNC
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|| TYPE_CODE (target) == TYPE_CODE_VOID)
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children = 0;
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else
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children = 1;
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break;
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default:
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/* Other types have no children. */
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break;
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}
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return children;
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}
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static char *
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c_name_of_variable (struct varobj *parent)
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{
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return xstrdup (parent->name);
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}
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/* Return the value of element TYPE_INDEX of a structure
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value VALUE. VALUE's type should be a structure,
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or union, or a typedef to struct/union.
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Returns NULL if getting the value fails. Never throws. */
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static struct value *
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value_struct_element_index (struct value *value, int type_index)
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{
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struct value *result = NULL;
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volatile struct gdb_exception e;
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struct type *type = value_type (value);
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type = check_typedef (type);
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gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT
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|| TYPE_CODE (type) == TYPE_CODE_UNION);
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TRY_CATCH (e, RETURN_MASK_ERROR)
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{
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if (field_is_static (&TYPE_FIELD (type, type_index)))
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result = value_static_field (type, type_index);
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else
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result = value_primitive_field (value, 0, type_index, type);
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}
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if (e.reason < 0)
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{
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return NULL;
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}
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else
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{
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return result;
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}
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}
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/* Obtain the information about child INDEX of the variable
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object PARENT.
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If CNAME is not null, sets *CNAME to the name of the child relative
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to the parent.
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If CVALUE is not null, sets *CVALUE to the value of the child.
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If CTYPE is not null, sets *CTYPE to the type of the child.
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If any of CNAME, CVALUE, or CTYPE is not null, but the corresponding
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information cannot be determined, set *CNAME, *CVALUE, or *CTYPE
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to NULL. */
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static void
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c_describe_child (struct varobj *parent, int index,
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char **cname, struct value **cvalue, struct type **ctype,
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char **cfull_expression)
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{
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struct value *value = parent->value;
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struct type *type = varobj_get_value_type (parent);
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char *parent_expression = NULL;
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int was_ptr;
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volatile struct gdb_exception except;
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if (cname)
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*cname = NULL;
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if (cvalue)
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*cvalue = NULL;
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if (ctype)
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*ctype = NULL;
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if (cfull_expression)
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{
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*cfull_expression = NULL;
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parent_expression
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= varobj_get_path_expr (varobj_get_path_expr_parent (parent));
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}
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adjust_value_for_child_access (&value, &type, &was_ptr, 0);
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switch (TYPE_CODE (type))
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{
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case TYPE_CODE_ARRAY:
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if (cname)
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*cname
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= xstrdup (int_string (index
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+ TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)),
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10, 1, 0, 0));
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if (cvalue && value)
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{
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int real_index = index + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type));
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TRY_CATCH (except, RETURN_MASK_ERROR)
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{
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*cvalue = value_subscript (value, real_index);
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}
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}
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if (ctype)
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*ctype = get_target_type (type);
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if (cfull_expression)
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*cfull_expression =
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xstrprintf ("(%s)[%s]", parent_expression,
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int_string (index
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+ TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)),
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10, 1, 0, 0));
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break;
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case TYPE_CODE_STRUCT:
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case TYPE_CODE_UNION:
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{
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const char *field_name;
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/* If the type is anonymous and the field has no name,
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set an appropriate name. */
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field_name = TYPE_FIELD_NAME (type, index);
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if (field_name == NULL || *field_name == '\0')
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{
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if (cname)
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{
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if (TYPE_CODE (TYPE_FIELD_TYPE (type, index))
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== TYPE_CODE_STRUCT)
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*cname = xstrdup (ANONYMOUS_STRUCT_NAME);
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else
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*cname = xstrdup (ANONYMOUS_UNION_NAME);
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}
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if (cfull_expression)
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*cfull_expression = xstrdup ("");
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}
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else
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{
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if (cname)
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*cname = xstrdup (field_name);
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if (cfull_expression)
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{
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char *join = was_ptr ? "->" : ".";
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*cfull_expression = xstrprintf ("(%s)%s%s", parent_expression,
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join, field_name);
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}
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}
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if (cvalue && value)
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{
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/* For C, varobj index is the same as type index. */
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*cvalue = value_struct_element_index (value, index);
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}
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if (ctype)
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*ctype = TYPE_FIELD_TYPE (type, index);
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}
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break;
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case TYPE_CODE_PTR:
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if (cname)
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*cname = xstrprintf ("*%s", parent->name);
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if (cvalue && value)
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{
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TRY_CATCH (except, RETURN_MASK_ERROR)
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{
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*cvalue = value_ind (value);
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}
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if (except.reason < 0)
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*cvalue = NULL;
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}
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/* Don't use get_target_type because it calls
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check_typedef and here, we want to show the true
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declared type of the variable. */
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if (ctype)
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*ctype = TYPE_TARGET_TYPE (type);
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if (cfull_expression)
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*cfull_expression = xstrprintf ("*(%s)", parent_expression);
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break;
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default:
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/* This should not happen. */
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if (cname)
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*cname = xstrdup ("???");
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if (cfull_expression)
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*cfull_expression = xstrdup ("???");
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/* Don't set value and type, we don't know then. */
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}
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}
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static char *
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c_name_of_child (struct varobj *parent, int index)
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{
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char *name;
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c_describe_child (parent, index, &name, NULL, NULL, NULL);
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return name;
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}
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static char *
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c_path_expr_of_child (struct varobj *child)
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{
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c_describe_child (child->parent, child->index, NULL, NULL, NULL,
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&child->path_expr);
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return child->path_expr;
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}
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static struct value *
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c_value_of_child (struct varobj *parent, int index)
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{
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struct value *value = NULL;
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c_describe_child (parent, index, NULL, &value, NULL, NULL);
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return value;
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}
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static struct type *
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c_type_of_child (struct varobj *parent, int index)
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{
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struct type *type = NULL;
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c_describe_child (parent, index, NULL, NULL, &type, NULL);
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return type;
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}
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/* This returns the type of the variable. It also skips past typedefs
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to return the real type of the variable. */
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static struct type *
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get_type (struct varobj *var)
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{
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struct type *type;
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type = var->type;
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if (type != NULL)
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type = check_typedef (type);
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return type;
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}
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static char *
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c_value_of_variable (struct varobj *var, enum varobj_display_formats format)
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{
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/* BOGUS: if val_print sees a struct/class, or a reference to one,
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it will print out its children instead of "{...}". So we need to
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catch that case explicitly. */
|
||
struct type *type = get_type (var);
|
||
|
||
/* Strip top-level references. */
|
||
while (TYPE_CODE (type) == TYPE_CODE_REF)
|
||
type = check_typedef (TYPE_TARGET_TYPE (type));
|
||
|
||
switch (TYPE_CODE (type))
|
||
{
|
||
case TYPE_CODE_STRUCT:
|
||
case TYPE_CODE_UNION:
|
||
return xstrdup ("{...}");
|
||
/* break; */
|
||
|
||
case TYPE_CODE_ARRAY:
|
||
{
|
||
char *number;
|
||
|
||
number = xstrprintf ("[%d]", var->num_children);
|
||
return (number);
|
||
}
|
||
/* break; */
|
||
|
||
default:
|
||
{
|
||
if (var->value == NULL)
|
||
{
|
||
/* This can happen if we attempt to get the value of a struct
|
||
member when the parent is an invalid pointer. This is an
|
||
error condition, so we should tell the caller. */
|
||
return NULL;
|
||
}
|
||
else
|
||
{
|
||
if (var->not_fetched && value_lazy (var->value))
|
||
/* Frozen variable and no value yet. We don't
|
||
implicitly fetch the value. MI response will
|
||
use empty string for the value, which is OK. */
|
||
return NULL;
|
||
|
||
gdb_assert (varobj_value_is_changeable_p (var));
|
||
gdb_assert (!value_lazy (var->value));
|
||
|
||
/* If the specified format is the current one,
|
||
we can reuse print_value. */
|
||
if (format == var->format)
|
||
return xstrdup (var->print_value);
|
||
else
|
||
return varobj_value_get_print_value (var->value, format, var);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
/* varobj operations for c. */
|
||
|
||
const struct lang_varobj_ops c_varobj_ops =
|
||
{
|
||
c_number_of_children,
|
||
c_name_of_variable,
|
||
c_name_of_child,
|
||
c_path_expr_of_child,
|
||
c_value_of_child,
|
||
c_type_of_child,
|
||
c_value_of_variable,
|
||
varobj_default_value_is_changeable_p,
|
||
NULL, /* value_has_mutated */
|
||
c_is_path_expr_parent /* is_path_expr_parent */
|
||
};
|
||
|
||
/* A little convenience enum for dealing with C++/Java. */
|
||
enum vsections
|
||
{
|
||
v_public = 0, v_private, v_protected
|
||
};
|
||
|
||
/* C++ */
|
||
|
||
static int
|
||
cplus_number_of_children (struct varobj *var)
|
||
{
|
||
struct value *value = NULL;
|
||
struct type *type;
|
||
int children, dont_know;
|
||
int lookup_actual_type = 0;
|
||
struct value_print_options opts;
|
||
|
||
dont_know = 1;
|
||
children = 0;
|
||
|
||
get_user_print_options (&opts);
|
||
|
||
if (!CPLUS_FAKE_CHILD (var))
|
||
{
|
||
type = varobj_get_value_type (var);
|
||
|
||
/* It is necessary to access a real type (via RTTI). */
|
||
if (opts.objectprint)
|
||
{
|
||
value = var->value;
|
||
lookup_actual_type = (TYPE_CODE (var->type) == TYPE_CODE_REF
|
||
|| TYPE_CODE (var->type) == TYPE_CODE_PTR);
|
||
}
|
||
adjust_value_for_child_access (&value, &type, NULL, lookup_actual_type);
|
||
|
||
if (((TYPE_CODE (type)) == TYPE_CODE_STRUCT)
|
||
|| ((TYPE_CODE (type)) == TYPE_CODE_UNION))
|
||
{
|
||
int kids[3];
|
||
|
||
cplus_class_num_children (type, kids);
|
||
if (kids[v_public] != 0)
|
||
children++;
|
||
if (kids[v_private] != 0)
|
||
children++;
|
||
if (kids[v_protected] != 0)
|
||
children++;
|
||
|
||
/* Add any baseclasses. */
|
||
children += TYPE_N_BASECLASSES (type);
|
||
dont_know = 0;
|
||
|
||
/* FIXME: save children in var. */
|
||
}
|
||
}
|
||
else
|
||
{
|
||
int kids[3];
|
||
|
||
type = varobj_get_value_type (var->parent);
|
||
|
||
/* It is necessary to access a real type (via RTTI). */
|
||
if (opts.objectprint)
|
||
{
|
||
struct varobj *parent = var->parent;
|
||
|
||
value = parent->value;
|
||
lookup_actual_type = (TYPE_CODE (parent->type) == TYPE_CODE_REF
|
||
|| TYPE_CODE (parent->type) == TYPE_CODE_PTR);
|
||
}
|
||
adjust_value_for_child_access (&value, &type, NULL, lookup_actual_type);
|
||
|
||
cplus_class_num_children (type, kids);
|
||
if (strcmp (var->name, "public") == 0)
|
||
children = kids[v_public];
|
||
else if (strcmp (var->name, "private") == 0)
|
||
children = kids[v_private];
|
||
else
|
||
children = kids[v_protected];
|
||
dont_know = 0;
|
||
}
|
||
|
||
if (dont_know)
|
||
children = c_number_of_children (var);
|
||
|
||
return children;
|
||
}
|
||
|
||
/* Compute # of public, private, and protected variables in this class.
|
||
That means we need to descend into all baseclasses and find out
|
||
how many are there, too. */
|
||
|
||
static void
|
||
cplus_class_num_children (struct type *type, int children[3])
|
||
{
|
||
int i, vptr_fieldno;
|
||
struct type *basetype = NULL;
|
||
|
||
children[v_public] = 0;
|
||
children[v_private] = 0;
|
||
children[v_protected] = 0;
|
||
|
||
vptr_fieldno = get_vptr_fieldno (type, &basetype);
|
||
for (i = TYPE_N_BASECLASSES (type); i < TYPE_NFIELDS (type); i++)
|
||
{
|
||
/* If we have a virtual table pointer, omit it. Even if virtual
|
||
table pointers are not specifically marked in the debug info,
|
||
they should be artificial. */
|
||
if ((type == basetype && i == vptr_fieldno)
|
||
|| TYPE_FIELD_ARTIFICIAL (type, i))
|
||
continue;
|
||
|
||
if (TYPE_FIELD_PROTECTED (type, i))
|
||
children[v_protected]++;
|
||
else if (TYPE_FIELD_PRIVATE (type, i))
|
||
children[v_private]++;
|
||
else
|
||
children[v_public]++;
|
||
}
|
||
}
|
||
|
||
static char *
|
||
cplus_name_of_variable (struct varobj *parent)
|
||
{
|
||
return c_name_of_variable (parent);
|
||
}
|
||
|
||
enum accessibility { private_field, protected_field, public_field };
|
||
|
||
/* Check if field INDEX of TYPE has the specified accessibility.
|
||
Return 0 if so and 1 otherwise. */
|
||
|
||
static int
|
||
match_accessibility (struct type *type, int index, enum accessibility acc)
|
||
{
|
||
if (acc == private_field && TYPE_FIELD_PRIVATE (type, index))
|
||
return 1;
|
||
else if (acc == protected_field && TYPE_FIELD_PROTECTED (type, index))
|
||
return 1;
|
||
else if (acc == public_field && !TYPE_FIELD_PRIVATE (type, index)
|
||
&& !TYPE_FIELD_PROTECTED (type, index))
|
||
return 1;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
cplus_describe_child (struct varobj *parent, int index,
|
||
char **cname, struct value **cvalue, struct type **ctype,
|
||
char **cfull_expression)
|
||
{
|
||
struct value *value;
|
||
struct type *type;
|
||
int was_ptr;
|
||
int lookup_actual_type = 0;
|
||
char *parent_expression = NULL;
|
||
struct varobj *var;
|
||
struct value_print_options opts;
|
||
|
||
if (cname)
|
||
*cname = NULL;
|
||
if (cvalue)
|
||
*cvalue = NULL;
|
||
if (ctype)
|
||
*ctype = NULL;
|
||
if (cfull_expression)
|
||
*cfull_expression = NULL;
|
||
|
||
get_user_print_options (&opts);
|
||
|
||
var = (CPLUS_FAKE_CHILD (parent)) ? parent->parent : parent;
|
||
if (opts.objectprint)
|
||
lookup_actual_type = (TYPE_CODE (var->type) == TYPE_CODE_REF
|
||
|| TYPE_CODE (var->type) == TYPE_CODE_PTR);
|
||
value = var->value;
|
||
type = varobj_get_value_type (var);
|
||
if (cfull_expression)
|
||
parent_expression
|
||
= varobj_get_path_expr (varobj_get_path_expr_parent (var));
|
||
|
||
adjust_value_for_child_access (&value, &type, &was_ptr, lookup_actual_type);
|
||
|
||
if (TYPE_CODE (type) == TYPE_CODE_STRUCT
|
||
|| TYPE_CODE (type) == TYPE_CODE_UNION)
|
||
{
|
||
char *join = was_ptr ? "->" : ".";
|
||
|
||
if (CPLUS_FAKE_CHILD (parent))
|
||
{
|
||
/* The fields of the class type are ordered as they
|
||
appear in the class. We are given an index for a
|
||
particular access control type ("public","protected",
|
||
or "private"). We must skip over fields that don't
|
||
have the access control we are looking for to properly
|
||
find the indexed field. */
|
||
int type_index = TYPE_N_BASECLASSES (type);
|
||
enum accessibility acc = public_field;
|
||
int vptr_fieldno;
|
||
struct type *basetype = NULL;
|
||
const char *field_name;
|
||
|
||
vptr_fieldno = get_vptr_fieldno (type, &basetype);
|
||
if (strcmp (parent->name, "private") == 0)
|
||
acc = private_field;
|
||
else if (strcmp (parent->name, "protected") == 0)
|
||
acc = protected_field;
|
||
|
||
while (index >= 0)
|
||
{
|
||
if ((type == basetype && type_index == vptr_fieldno)
|
||
|| TYPE_FIELD_ARTIFICIAL (type, type_index))
|
||
; /* ignore vptr */
|
||
else if (match_accessibility (type, type_index, acc))
|
||
--index;
|
||
++type_index;
|
||
}
|
||
--type_index;
|
||
|
||
/* If the type is anonymous and the field has no name,
|
||
set an appopriate name. */
|
||
field_name = TYPE_FIELD_NAME (type, type_index);
|
||
if (field_name == NULL || *field_name == '\0')
|
||
{
|
||
if (cname)
|
||
{
|
||
if (TYPE_CODE (TYPE_FIELD_TYPE (type, type_index))
|
||
== TYPE_CODE_STRUCT)
|
||
*cname = xstrdup (ANONYMOUS_STRUCT_NAME);
|
||
else if (TYPE_CODE (TYPE_FIELD_TYPE (type, type_index))
|
||
== TYPE_CODE_UNION)
|
||
*cname = xstrdup (ANONYMOUS_UNION_NAME);
|
||
}
|
||
|
||
if (cfull_expression)
|
||
*cfull_expression = xstrdup ("");
|
||
}
|
||
else
|
||
{
|
||
if (cname)
|
||
*cname = xstrdup (TYPE_FIELD_NAME (type, type_index));
|
||
|
||
if (cfull_expression)
|
||
*cfull_expression
|
||
= xstrprintf ("((%s)%s%s)", parent_expression, join,
|
||
field_name);
|
||
}
|
||
|
||
if (cvalue && value)
|
||
*cvalue = value_struct_element_index (value, type_index);
|
||
|
||
if (ctype)
|
||
*ctype = TYPE_FIELD_TYPE (type, type_index);
|
||
}
|
||
else if (index < TYPE_N_BASECLASSES (type))
|
||
{
|
||
/* This is a baseclass. */
|
||
if (cname)
|
||
*cname = xstrdup (TYPE_FIELD_NAME (type, index));
|
||
|
||
if (cvalue && value)
|
||
*cvalue = value_cast (TYPE_FIELD_TYPE (type, index), value);
|
||
|
||
if (ctype)
|
||
{
|
||
*ctype = TYPE_FIELD_TYPE (type, index);
|
||
}
|
||
|
||
if (cfull_expression)
|
||
{
|
||
char *ptr = was_ptr ? "*" : "";
|
||
|
||
/* Cast the parent to the base' type. Note that in gdb,
|
||
expression like
|
||
(Base1)d
|
||
will create an lvalue, for all appearences, so we don't
|
||
need to use more fancy:
|
||
*(Base1*)(&d)
|
||
construct.
|
||
|
||
When we are in the scope of the base class or of one
|
||
of its children, the type field name will be interpreted
|
||
as a constructor, if it exists. Therefore, we must
|
||
indicate that the name is a class name by using the
|
||
'class' keyword. See PR mi/11912 */
|
||
*cfull_expression = xstrprintf ("(%s(class %s%s) %s)",
|
||
ptr,
|
||
TYPE_FIELD_NAME (type, index),
|
||
ptr,
|
||
parent_expression);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
char *access = NULL;
|
||
int children[3];
|
||
|
||
cplus_class_num_children (type, children);
|
||
|
||
/* Everything beyond the baseclasses can
|
||
only be "public", "private", or "protected"
|
||
|
||
The special "fake" children are always output by varobj in
|
||
this order. So if INDEX == 2, it MUST be "protected". */
|
||
index -= TYPE_N_BASECLASSES (type);
|
||
switch (index)
|
||
{
|
||
case 0:
|
||
if (children[v_public] > 0)
|
||
access = "public";
|
||
else if (children[v_private] > 0)
|
||
access = "private";
|
||
else
|
||
access = "protected";
|
||
break;
|
||
case 1:
|
||
if (children[v_public] > 0)
|
||
{
|
||
if (children[v_private] > 0)
|
||
access = "private";
|
||
else
|
||
access = "protected";
|
||
}
|
||
else if (children[v_private] > 0)
|
||
access = "protected";
|
||
break;
|
||
case 2:
|
||
/* Must be protected. */
|
||
access = "protected";
|
||
break;
|
||
default:
|
||
/* error! */
|
||
break;
|
||
}
|
||
|
||
gdb_assert (access);
|
||
if (cname)
|
||
*cname = xstrdup (access);
|
||
|
||
/* Value and type and full expression are null here. */
|
||
}
|
||
}
|
||
else
|
||
{
|
||
c_describe_child (parent, index, cname, cvalue, ctype, cfull_expression);
|
||
}
|
||
}
|
||
|
||
static char *
|
||
cplus_name_of_child (struct varobj *parent, int index)
|
||
{
|
||
char *name = NULL;
|
||
|
||
cplus_describe_child (parent, index, &name, NULL, NULL, NULL);
|
||
return name;
|
||
}
|
||
|
||
static char *
|
||
cplus_path_expr_of_child (struct varobj *child)
|
||
{
|
||
cplus_describe_child (child->parent, child->index, NULL, NULL, NULL,
|
||
&child->path_expr);
|
||
return child->path_expr;
|
||
}
|
||
|
||
static struct value *
|
||
cplus_value_of_child (struct varobj *parent, int index)
|
||
{
|
||
struct value *value = NULL;
|
||
|
||
cplus_describe_child (parent, index, NULL, &value, NULL, NULL);
|
||
return value;
|
||
}
|
||
|
||
static struct type *
|
||
cplus_type_of_child (struct varobj *parent, int index)
|
||
{
|
||
struct type *type = NULL;
|
||
|
||
cplus_describe_child (parent, index, NULL, NULL, &type, NULL);
|
||
return type;
|
||
}
|
||
|
||
static char *
|
||
cplus_value_of_variable (struct varobj *var,
|
||
enum varobj_display_formats format)
|
||
{
|
||
|
||
/* If we have one of our special types, don't print out
|
||
any value. */
|
||
if (CPLUS_FAKE_CHILD (var))
|
||
return xstrdup ("");
|
||
|
||
return c_value_of_variable (var, format);
|
||
}
|
||
|
||
|
||
/* varobj operations for c++. */
|
||
|
||
const struct lang_varobj_ops cplus_varobj_ops =
|
||
{
|
||
cplus_number_of_children,
|
||
cplus_name_of_variable,
|
||
cplus_name_of_child,
|
||
cplus_path_expr_of_child,
|
||
cplus_value_of_child,
|
||
cplus_type_of_child,
|
||
cplus_value_of_variable,
|
||
varobj_default_value_is_changeable_p,
|
||
NULL, /* value_has_mutated */
|
||
c_is_path_expr_parent /* is_path_expr_parent */
|
||
};
|
||
|
||
|