1// Copyright 2013 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 --store-elimination 29 30// Test local elimination of unobservable stores. 31 32function B(x, y) { 33 this.x = x; 34 this.y = y; 35 return this; 36} 37 38function test_store_store() { 39 var a = new B(1, 2); 40 a.x = 3; // eliminatable. 41 a.x = 4; 42 return a.x; 43} 44 45function test_store_load_store1() { 46 var a = new B(6, 7); 47 a.x = 3; // eliminatable. 48 var r = a.y; 49 a.x = 4; 50 return r; 51} 52 53function test_store_load_store2() { 54 var a = new B(6, 8); 55 a.x = 3; // not eliminatable, unless next load is eliminated. 56 var r = a.x; 57 a.x = 4; 58 return r; 59} 60 61function test_store_call_store() { 62 var a = new B(2, 9); 63 a.x = 3; // not eliminatable. 64 killall(); 65 a.x = 4; 66 return a.y; 67} 68 69function test_store_deopt_store() { 70 var a = new B(2, 1); 71 a.x = 3; // not eliminatable (implicit ValueOf following) 72 var c = a + 2; 73 a.x = 4; 74 return a.y; 75} 76 77function killall() { 78 try { } catch(e) { } 79} 80 81%NeverOptimizeFunction(killall); 82 83function test(x, f) { 84 assertEquals(x, f()); 85 assertEquals(x, f()); 86 %OptimizeFunctionOnNextCall(f); 87 assertEquals(x, f()); 88} 89 90test(4, test_store_store); 91test(7, test_store_load_store1); 92test(3, test_store_load_store2); 93test(9, test_store_call_store); 94test(1, test_store_deopt_store); 95