1 // Copyright 2010 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // Flags: --allow-natives-syntax 29 30 // Regression test for failure to deoptimize properly when the most recent 31 // side effect occurred in a comma expression in an effect context. 32 33 // An unoptimizable function, calling it is a side effect. 34 function side_effect() { try {} finally {} return "wrong"; } 35 36 // A function to observe the value of its first argument. 37 function observe(x, y) { try {} finally {} return x; } 38 39 // If we optimize for x a smi, then x a string will deopt. The side effect 40 // immediately before the deopt is in a comma expresion in an effect context 41 // (i.e., itself the left subexpression of a comma expression). 42 function test(x) { return observe(this, ((0, side_effect()), x + 1)); } 43 44 // Run test enough times to get it optimized. 45 for (var i = 0; i < 5; ++i) test(0); 46 %OptimizeFunctionOnNextCall(test); 47 test(0); 48 49 // Force test to deopt. If it behaves normally, it should return the global 50 // object. If the value of the call to side_effect() is lingering after the 51 // deopt, it will return the string "wrong". 52 assertFalse(test("a") === "wrong"); 53
