Make arguments and caller always be null on native functions (fixes issue 1548 and issue 1643).

With this change we follow Firefox, Safari has a slightly different approach where the property is just not there (at least according to GetOwnProperty). 
Review URL: http://codereview.chromium.org/7792054

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9093 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/v8natives.js

@@ -55,6 +55,15 @@ function InstallFunctions(object, attributes, functions) {
     var f = functions[i + 1];
     %FunctionSetName(f, key);
     %FunctionRemovePrototype(f);
+    // We match firefox on this, but not Safari (which does not have the
+    // property at all).
+    %IgnoreAttributesAndSetProperty(f, "caller",
+                                    null,
+                                    DONT_ENUM | DONT_DELETE);
+    %IgnoreAttributesAndSetProperty(f, "arguments",
+                                    null,
+                                    DONT_ENUM | DONT_DELETE);
+
     %SetProperty(object, key, f, attributes);
     %SetNativeFlag(f);
   }

test/mjsunit/regress/regress-1548.js

+// 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.
+//     * 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.
+
+// Test that the caller and arguments objects are not available on native
+// functions.
+
+function testfn(f) { return [1].map(f)[0]; }
+function foo() { return [].map.caller; }
+assertEquals(null, testfn(foo));
+
+// Try to delete the caller property (to make sure that we can't get to the
+// caller accessor on the prototype.
+delete Array.prototype.map.caller;
+assertEquals(null, testfn(foo));
+
+// Redo tests with arguments object.
+function testarguments(f) { return [1].map(f)[0]; }
+function bar() { return [].map.arguments; }
+assertEquals(null, testfn(bar));
+
+// Try to delete the arguments property (to make sure that we can't get to the
+// caller accessor on the prototype.
+delete Array.prototype.map.arguments;
+assertEquals(null, testarguments(bar));