Fix computation of the 'editable' attribute and

value changeability for for references.
        * varobj.c (get_value_type): New function.
        (c_variable_editable): Use get_value_type.
        (varobj_value_is_changeable): Likewise.

gdb/ChangeLog

@@ -1,3 +1,11 @@
+2007-01-24  Vladimir Prus  <vladimir@codesourcery.com>
+
+	Fix computation of the 'editable' attribute and
+	value changeability for for references.
+	* varobj.c (get_value_type): New function.
+	(c_variable_editable): Use get_value_type.
+	(varobj_value_is_changeable): Likewise.
+		
 2007-01-24  Joel Brobecker  <brobecker@adacore.com>
 
 	* source.c (find_and_open_source): Try rewriting the source

gdb/testsuite/ChangeLog

@@ -1,3 +1,13 @@
+2007-01-24  Vladimir Prus  <vladimir@codesourcery.com>
+
+	* lib/mi-support.exp (mi_delete_varobj): New.
+	* gdb.mi/mi-var-cp.exp: Run the reference_to_struct
+	testcase.
+	* gdb.mi/mi-var-cp.cc (reference_to_struct): New function.
+	(main): Call the above.
+	(reference_update_test, base_in_reference_test)
+	(reference_to_pointer): Delete the created varobjs.
+	
 2007-01-23  Daniel Jacobowitz  <dan@codesourcery.com>
 
 	* Makefile.in (ALL_SUBDIRS): Add gdb.xml.

gdb/testsuite/gdb.mi/mi-var-cp.cc

@@ -30,6 +30,7 @@ void reference_update_tests ()
       :*/  
   x = 567;
   /*: mi_varobj_update RX {} "update RX (3)"
+      mi_delete_varobj RX "delete RX"
     :*/
   /* Dummy assignment to keep 'x' in scope.  */
   x = 444;    
@@ -59,7 +60,8 @@ int base_in_reference_test (S2& s2)
 
     mi_check_varobj_value "S2.S.public.i" "67" "check S2.S.public.i"
     mi_check_varobj_value "S2.S.public.j" "89" "check S2.S.public.j"
-
+    mi_delete_varobj S2 "delete S2"
+    
   :*/
   /*: END: base_in_reference :*/
 }
@@ -91,15 +93,39 @@ int reference_to_pointer ()
 
     mi_check_varobj_value RPTR.public.i 67 "check i member"
     mi_check_varobj_value RPTR.public.j 89 "check j member"
+    mi_delete_varobj RPTR "delete RPTR"
   :*/
   return 99;
   /*: END: reference_to_pointer :*/
 }
 
+int reference_to_struct ()
+{
+  /*: BEGIN: reference_to_struct :*/
+  S s = {7, 8};
+  S& r = s;
+  /*:
+    mi_create_varobj S s "create varobj for s"
+    mi_create_varobj R r "create varobj for s"
+    mi_gdb_test "-var-show-attributes S" \
+	"\\^done,attr=\"noneditable\"" \
+	"check attributes of S"
+    mi_gdb_test "-var-show-attributes R" \
+	"\\^done,attr=\"noneditable\"" \
+	"check attributes of R"
+    :*/
+  s.i = 56;
+  /*: mi_varobj_update * [] "-var-update should not list structure varobjs"
+    :*/
+  return 99;
+  /*: END: reference_to_struct :*/
+}
+
 int main ()
 {
   reference_update_tests ();
   base_in_reference_test_main ();
   reference_to_pointer ();
+  reference_to_struct ();
   return 0;
 }

gdb/testsuite/gdb.mi/mi-var-cp.exp

@@ -44,6 +44,7 @@ mi_prepare_inline_tests $srcfile
 mi_run_inline_test reference_update
 mi_run_inline_test base_in_reference
 mi_run_inline_test reference_to_pointer
+mi_run_inline_test reference_to_struct
 
 mi_gdb_exit
 return 0

gdb/testsuite/lib/mi-support.exp

@@ -1023,6 +1023,13 @@ proc mi_create_varobj { name expression testname } {
         $testname
 }
 
+# Deletes the specified NAME. 
+proc mi_delete_varobj { name testname } {
+    mi_gdb_test "-var-delete $name" \
+        "\\^done,ndeleted=.*" \
+        $testname
+}
+
 # Updates varobj named NAME and checks that all varobjs in EXPECTED
 # are reported as updated, and no other varobj is updated.
 # Assumes that no varobj is out of scope and that no varobj changes

gdb/varobj.c

@@ -176,6 +176,8 @@ static struct cleanup *make_cleanup_free_variable (struct varobj *var);
 
 static struct type *get_type (struct varobj *var);
 
+static struct type *get_value_type (struct varobj *var);
+
 static struct type *get_type_deref (struct varobj *var);
 
 static struct type *get_target_type (struct type *);
@@ -1459,6 +1461,37 @@ get_type (struct varobj *var)
   return type;
 }
 
+/* Return the type of the value that's stored in VAR,
+   or that would have being stored there if the
+   value were accessible.  
+
+   This differs from VAR->type in that VAR->type is always
+   the true type of the expession in the source language.
+   The return value of this function is the type we're
+   actually storing in varobj, and using for displaying
+   the values and for comparing previous and new values.
+
+   For example, top-level references are always stripped.  */
+static struct type *
+get_value_type (struct varobj *var)
+{
+  struct type *type;
+
+  if (var->value)
+    type = value_type (var->value);
+  else
+    type = var->type;
+
+  type = check_typedef (type);
+
+  if (TYPE_CODE (type) == TYPE_CODE_REF)
+    type = get_target_type (type);
+
+  type = check_typedef (type);
+
+  return type;
+}
+
 /* This returns the type of the variable, dereferencing references, pointers
    and references to pointers, too. */
 static struct type *
@@ -1723,7 +1756,7 @@ varobj_value_is_changeable_p (struct varobj *var)
   if (CPLUS_FAKE_CHILD (var))
     return 0;
 
-  type = get_type (var);
+  type = get_value_type (var);
 
   switch (TYPE_CODE (type))
     {
@@ -2020,7 +2053,7 @@ c_type_of_child (struct varobj *parent, int index)
 static int
 c_variable_editable (struct varobj *var)
 {
-  switch (TYPE_CODE (get_type (var)))
+  switch (TYPE_CODE (get_value_type (var)))
     {
     case TYPE_CODE_STRUCT:
     case TYPE_CODE_UNION: