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

test/mjsunit/error-constructors.js

-// 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:
 //
 //     * 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.
@@ skipping 11 matching lines @@
 // 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.
 
 var e = new Error();
 assertFalse(e.hasOwnProperty('message'));
 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);
+