d4511a3a93
the prototype chain. In case we're skipping a global object, we have to be careful not to use ICs for the load, because it's possible to introduce variables on the global object without a map change. Review URL: http://codereview.chromium.org/149316 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2385 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
46 lines
2.2 KiB
JavaScript
46 lines
2.2 KiB
JavaScript
// Copyright 2009 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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function LoadX(obj) { return obj.x; }
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// Load x from the prototype of this. Make sure to initialize the IC.
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this.__proto__ = { x: 42 };
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for (var i = 0; i < 3; i++) assertEquals(42, LoadX(this));
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// Introduce a global variable and make sure we load that from LoadX.
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this.x = 87;
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for (var i = 0; i < 3; i++) assertEquals(87, LoadX(this));
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// Delete the global variable and make sure we get back to loading from
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// the prototype.
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delete this.x;
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for (var i = 0; i < 3; i++) assertEquals(42, LoadX(this));
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// ... and go back again to loading directly from the object.
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this.x = 99;
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for (var i = 0; i < 3; i++) assertEquals(99, LoadX(this));
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