Implementing String.prototype.toString and String.prototype.valueOf built-in routines.

src/libecmaoperations/ecma-string-object.c

@@ -14,7 +14,9 @@
  */
 
 #include "ecma-alloc.h"
+#include "ecma-builtins.h"
 #include "ecma-exceptions.h"
+#include "ecma-gc.h"
 #include "ecma-globals.h"
 #include "ecma-helpers.h"
 #include "ecma-objects.h"
@@ -67,9 +69,11 @@ ecma_op_create_string_object (ecma_value_t *arguments_list_p, /**< list of argum
     }
   }
 
-  FIXME (/* Set to built-in String prototype (15.5.4) */);
-
-  ecma_object_t *obj_p = ecma_create_object (NULL, true, ECMA_OBJECT_TYPE_STRING);
+  ecma_object_t *prototype_obj_p = ecma_builtin_get (ECMA_BUILTIN_ID_STRING_PROTOTYPE);
+  ecma_object_t *obj_p = ecma_create_object (prototype_obj_p,
+                                             true,
+                                             ECMA_OBJECT_TYPE_STRING);
+  ecma_deref_object (prototype_obj_p);
 
   ecma_property_t *class_prop_p = ecma_create_internal_property (obj_p, ECMA_INTERNAL_PROPERTY_CLASS);
   class_prop_p->u.internal_property.value = ECMA_OBJECT_CLASS_STRING;