Added IsProperty() check to result in DefineOrRedefineAccessor - if no check

this causes the debug check to fails since type() asserts that the 
lookup_type != NOT_FOUND. This does not change any functionality since we 
explicitly checked if it was one of the three types that we need to delete.
Also changed defineProperties in v8natives to actually return the object
being defined (as specified by spec)

Review URL: http://codereview.chromium.org/572003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3794 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -2906,10 +2906,11 @@ static Object* Runtime_DefineOrRedefineAccessorProperty(Arguments args) {
   // If an existing property is either FIELD, NORMAL or CONSTANT_FUNCTION
   // delete it to avoid running into trouble in DefineAccessor, which
   // handles this incorrectly if the property is readonly (does nothing)
-  if (result.type() == FIELD || result.type() == NORMAL
-      || result.type() == CONSTANT_FUNCTION)
+  if (result.IsValid() &&
+      (result.type() == FIELD || result.type() == NORMAL
+       || result.type() == CONSTANT_FUNCTION)) {
     obj->DeleteProperty(name, JSObject::NORMAL_DELETION);
-
+  }
   return obj->DefineAccessor(name, flag_setter->value() == 0, fun, attr);
 }
 

src/v8natives.js

@@ -689,6 +689,7 @@ function ObjectDefineProperties(obj, properties) {
     var desc = key_values[i + 1];
     DefineOwnProperty(obj, key, desc, true);
   }
+  return obj;
 }
 
 

test/mjsunit/object-define-properties.js

@@ -0,0 +1,56 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Tests the Object.defineProperties method - ES 15.2.3.7
+// Note that the internal DefineOwnProperty method is tested through 
+// object-define-property.js, this file only contains tests specific for
+// Object.defineProperties. Also note that object-create.js contains
+// a range of indirect tests on this method since Object.create uses
+// Object.defineProperties as a step in setting up the object.
+
+// Try defining with null as descriptor:
+try {
+  Object.defineProperties({}, null);
+} catch(e) {
+  assertTrue(/null to object/.test(e));
+}
+
+// Try defining with null as object
+try {
+  Object.defineProperties(null, {});
+} catch(e) {
+  assertTrue(/called on non-object/.test(e));
+}
+
+
+var desc = {foo: {value: 10}, bar: {get: function() {return 42; }}};
+var obj = {};
+// Check that we actually get the object back as returnvalue
+var x = Object.defineProperties(obj, desc);
+
+assertEquals(x.foo, 10);
+assertEquals(x.bar, 42);