1e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// Copyright 2009 the V8 project authors. All rights reserved. 2e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// Redistribution and use in source and binary forms, with or without 3e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// modification, are permitted provided that the following conditions are 4e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// met: 5e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// 6e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// * Redistributions of source code must retain the above copyright 7e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// notice, this list of conditions and the following disclaimer. 8e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// * Redistributions in binary form must reproduce the above 9e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// copyright notice, this list of conditions and the following 10e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// disclaimer in the documentation and/or other materials provided 11e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// with the distribution. 12e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// * Neither the name of Google Inc. nor the names of its 13e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// contributors may be used to endorse or promote products derived 14e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// from this software without specific prior written permission. 15e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// 16e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 28e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// See: http://code.google.com/p/v8/issues/detail?id=545 29e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// and: http://code.google.com/p/chromium/issues/detail?id=28353 30e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 31e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// The "this" variable proxy was reused. If context annotations differ between 32e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// uses, this can cause a use in a value context to assume a test context. Since 33e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// it has no true/false labels set, it causes a null-pointer dereference and 34e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// segmentation fault. 35e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 36e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// Code should not crash: 37e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 38e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// Original bug report by Robert Swiecki (wrapped to not throw): 39e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarketry { 40e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke new IsPrimitive(load())?this.join():String(' ').charCodeAt((!this>Math)); 41e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke} catch (e) {} 42e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 43e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke// Shorter examples: 44e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 45e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarkethis + !this; 46e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 47e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarkethis + (this ? 1 : 2); 48