Finish constification of varobj interface

This completes the constification of the struct varobj pointers in the
lang_varobj_ops interface partially done in
b09e2c591f9221d865bfe8425990a6bf9fab24e3. As suggested by Pedro,
varobj_get_path_expr casts away the const to assign the "mutable" struct
member.

gdb/ChangeLog:

	* ada-varobj.c (ada_name_of_child): Constify parent.
	(ada_path_expr_of_child): Same.
	(ada_value_of_child): Same.
	(ada_type_of_child): Same.
	* c-varobj.c (c_is_path_expr_parent): Same.
	(c_describe_child): Same.
	(c_name_of_child): Same.
	(c_value_of_child): Same.
	(c_type_of_child): Same.
	(cplus_number_of_children): Same.
	(cplus_describe_child): Constify var.
	(cplus_name_of_child): Constify parent.
	(cplus_value_of_child): Same.
	(cplus_type_of_child): Same.
	* jv-varobj.c (java_name_of_child): Same.
	(java_value_of_child): Same.
	(java_type_of_child): Same.
	* varobj.c (value_of_child): Same.
	(varobj_default_is_path_expr_parent): Constify var, parent and return
	value.
	(varobj_get_path_expr): Constify var, modify path_expr through
	mutable_var.
	(install_new_value): Constify parent.
	(value_of_child): Constify parent.
	* varobj.h (struct varobj): Constify parent.
	(struct lang_varobj_ops): Constify name_of_child, value_of_child and
	type_of_child.
	(varobj_get_path_expr): Constify var.
	(varobj_get_path_expr_parent): Constify var and return value.

1 files changed, 7 insertions, 6 deletions

diff --git a/gdb/varobj.h b/gdb/varobj.h
index 30c31ef..6fe7009 100644
--- a/gdb/varobj.h
+++ b/gdb/varobj.h
@@ -120,7 +120,7 @@ struct varobj
   int num_children;
 
   /* If this object is a child, this points to its immediate parent.  */
-  struct varobj *parent;
+  const struct varobj *parent;
 
   /* Children of this object.  */
   VEC (varobj_p) *children;
@@ -175,7 +175,7 @@ struct lang_varobj_ops
 
   /* The name of the INDEX'th child of PARENT.  The returned value must be
      freed by the caller.  */
-  char *(*name_of_child) (struct varobj *parent, int index);
+  char *(*name_of_child) (const struct varobj *parent, int index);
 
   /* Returns the rooted expression of CHILD, which is a variable
      obtain that has some parent.  The returned value must be freed by the
@@ -183,10 +183,10 @@ struct lang_varobj_ops
   char *(*path_expr_of_child) (const struct varobj *child);
 
   /* The ``struct value *'' of the INDEX'th child of PARENT.  */
-  struct value *(*value_of_child) (struct varobj *parent, int index);
+  struct value *(*value_of_child) (const struct varobj *parent, int index);
 
   /* The type of the INDEX'th child of PARENT.  */
-  struct type *(*type_of_child) (struct varobj *parent, int index);
+  struct type *(*type_of_child) (const struct varobj *parent, int index);
 
   /* The current value of VAR.  The returned value must be freed by the
      caller.  */
@@ -285,7 +285,7 @@ extern char *varobj_get_type (struct varobj *var);
 
 extern struct type *varobj_get_gdb_type (const struct varobj *var);
 
-extern char *varobj_get_path_expr (struct varobj *var);
+extern char *varobj_get_path_expr (const struct varobj *var);
 
 extern const struct language_defn *
   varobj_get_language (const struct varobj *var);
@@ -329,7 +329,8 @@ extern struct type *varobj_get_value_type (const struct varobj *var);
 
 extern int varobj_is_anonymous_child (const struct varobj *child);
 
-extern struct varobj *varobj_get_path_expr_parent (struct varobj *var);
+extern const struct varobj *
+  varobj_get_path_expr_parent (const struct varobj *var);
 
 extern char *varobj_value_get_print_value (struct value *value,
 					   enum varobj_display_formats format,