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.
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/* varobj support for Java.
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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 "varobj.h"
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/* Java */
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static int
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java_number_of_children (struct varobj *var)
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{
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return cplus_varobj_ops.number_of_children (var);
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}
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static char *
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java_name_of_variable (struct varobj *parent)
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{
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char *p, *name;
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name = cplus_varobj_ops.name_of_variable (parent);
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/* If the name has "-" in it, it is because we
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needed to escape periods in the name... */
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p = name;
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while (*p != '\000')
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{
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if (*p == '-')
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*p = '.';
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p++;
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}
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return name;
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}
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static char *
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java_name_of_child (struct varobj *parent, int index)
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{
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char *name, *p;
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name = cplus_varobj_ops.name_of_child (parent, index);
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/* Escape any periods in the name... */
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p = name;
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while (*p != '\000')
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{
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if (*p == '.')
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*p = '-';
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p++;
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}
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return name;
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}
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static char *
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java_path_expr_of_child (struct varobj *child)
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{
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return NULL;
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}
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static struct value *
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java_value_of_child (struct varobj *parent, int index)
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{
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return cplus_varobj_ops.value_of_child (parent, index);
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}
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static struct type *
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java_type_of_child (struct varobj *parent, int index)
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{
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return cplus_varobj_ops.type_of_child (parent, index);
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}
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static char *
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java_value_of_variable (struct varobj *var, enum varobj_display_formats format)
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{
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return cplus_varobj_ops.value_of_variable (var, format);
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}
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/* varobj operations for java. */
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const struct lang_varobj_ops java_varobj_ops =
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{
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java_number_of_children,
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java_name_of_variable,
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java_name_of_child,
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java_path_expr_of_child,
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java_value_of_child,
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java_type_of_child,
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java_value_of_variable,
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varobj_default_value_is_changeable_p,
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NULL, /* value_has_mutated */
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varobj_default_is_path_expr_parent
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};
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