Merge 6168:6800 from bleeding_edge to experimental/gc branch.

test/mjsunit/error-constructors.js

Index: test/mjsunit/error-constructors.js
===================================================================
--- test/mjsunit/error-constructors.js	(revision 6800)
+++ test/mjsunit/error-constructors.js	(working copy)
@@ -1,4 +1,4 @@
-// Copyright 2009 the V8 project authors. All rights reserved.
+// Copyright 2011 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:
@@ -30,3 +30,32 @@
 Error.prototype.toString = Object.prototype.toString;
 assertEquals("[object Error]", Error.prototype.toString());
 assertEquals(Object.prototype, Error.prototype.__proto__);
+
+// Check that error construction does not call setters for the
+// properties on error objects in prototypes.
+function fail() { assertTrue(false); };
+ReferenceError.prototype.__defineSetter__('stack', fail);
+ReferenceError.prototype.__defineSetter__('message', fail);
+ReferenceError.prototype.__defineSetter__('type', fail);
+ReferenceError.prototype.__defineSetter__('arguments', fail);
+var e0 = new ReferenceError();
+var e1 = new ReferenceError('123');
+assertTrue(e1.hasOwnProperty('message'));
+assertTrue(e0.hasOwnProperty('stack'));
+assertTrue(e1.hasOwnProperty('stack'));
+assertTrue(e0.hasOwnProperty('type'));
+assertTrue(e1.hasOwnProperty('type'));
+assertTrue(e0.hasOwnProperty('arguments'));
+assertTrue(e1.hasOwnProperty('arguments'));
+
+// Check that the name property on error prototypes is read-only and
+// dont-delete. This is not specified, but allowing overwriting the
+// name property with a getter can leaks error objects from different
+// script tags in the same context in a browser setting. We therefore
+// disallow changes to the name property on error objects.
+assertEquals("ReferenceError", ReferenceError.prototype.name);
+delete ReferenceError.prototype.name;
+assertEquals("ReferenceError", ReferenceError.prototype.name);
+ReferenceError.prototype.name = "not a reference error";
+assertEquals("ReferenceError", ReferenceError.prototype.name);
+