dc91c4218b
If we have a property access of the form this.x, where the access site sees the global object, we can specialize the IC stub so that it performs a map check without first performing a heap object check. Ensure that we do not get in JS code with a non-JSObject this value by deoptimizing at Function.prototype.apply if the first argument is not a JSObject. BUG=v8:1128 Review URL: http://codereview.chromium.org/6463025 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6707 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
53 lines
2.1 KiB
JavaScript
53 lines
2.1 KiB
JavaScript
// 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.
|
|
|
|
// Test of arguments.
|
|
|
|
// Test passing null or undefined as receiver.
|
|
function f() { return this.foo; }
|
|
|
|
function g() { return f.apply(null, arguments); }
|
|
function h() { return f.apply(void 0, arguments); }
|
|
|
|
var foo = 42;
|
|
|
|
for (var i=0; i<1000000; i++) assertEquals(42, g());
|
|
for (var i=0; i<1000000; i++) assertEquals(42, h());
|
|
|
|
var G1 = 21;
|
|
var G2 = 22;
|
|
|
|
function u() {
|
|
var v = G1 + G2;
|
|
return f.apply(v, arguments);
|
|
}
|
|
|
|
Number.prototype.foo = 42;
|
|
delete Number.prototype.foo;
|
|
|
|
for (var i=0; i<100000; i++) assertEquals(void 0, u());
|