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 --load-elimination 29 30// Test local load elimination of redundant loads and stores. 31 32function B(x, y) { 33 this.x = x; 34 this.y = y; 35 return this; 36} 37 38function C() { 39} 40 41function test_load() { 42 var a = new B(1, 2); 43 return a.x + a.x + a.x + a.x; 44} 45 46 47function test_load_from_different_contexts() { 48 var r = 1; 49 this.f = function() { 50 var fr = r; 51 this.g = function(flag) { 52 var gr; 53 if (flag) { 54 gr = r; 55 } else { 56 gr = r; 57 } 58 return gr + r + fr; 59 }; 60 }; 61 this.f(); 62 return this.g(true); 63} 64 65 66function test_store_load() { 67 var a = new B(1, 2); 68 a.x = 4; 69 var f = a.x; 70 a.x = 5; 71 var g = a.x; 72 a.x = 6; 73 var h = a.x; 74 a.x = 7; 75 return f + g + h + a.x; 76} 77 78function test_nonaliasing_store1() { 79 var a = new B(2, 3), b = new B(3, 4); 80 b.x = 4; 81 var f = a.x; 82 b.x = 5; 83 var g = a.x; 84 b.x = 6; 85 var h = a.x; 86 b.x = 7; 87 return f + g + h + a.x; 88} 89 90function test_transitioning_store1() { 91 var a = new B(2, 3); 92 var f = a.x, g = a.y; 93 var b = new B(3, 4); 94 return a.x + a.y; 95} 96 97function test_transitioning_store2() { 98 var b = new C(); 99 var a = new B(-1, 5); 100 var f = a.x, g = a.y; 101 b.x = 9; 102 b.y = 11; 103 return a.x + a.y; 104} 105 106var false_v = false; 107function test_transitioning_store3() { 108 var o = new C(); 109 var v = o; 110 if (false_v) v = 0; 111 v.x = 20; 112 return o.x; 113} 114 115function killall() { 116 try { } catch(e) { } 117} 118 119%NeverOptimizeFunction(killall); 120 121function test_store_load_kill() { 122 var a = new B(1, 2); 123 a.x = 4; 124 var f = a.x; 125 a.x = 5; 126 var g = a.x; 127 killall(); 128 a.x = 6; 129 var h = a.x; 130 a.x = 7; 131 return f + g + h + a.x; 132} 133 134function test_store_store() { 135 var a = new B(6, 7); 136 a.x = 7; 137 a.x = 7; 138 a.x = 7; 139 a.x = 7; 140 return a.x; 141} 142 143function test(x, f) { 144 assertEquals(x, f()); 145 assertEquals(x, f()); 146 %OptimizeFunctionOnNextCall(f); 147 assertEquals(x, f()); 148} 149 150test(4, test_load); 151test(3, new test_load_from_different_contexts().g); 152test(22, test_store_load); 153test(8, test_nonaliasing_store1); 154test(5, test_transitioning_store1); 155test(4, test_transitioning_store2); 156test(20, test_transitioning_store3); 157test(22, test_store_load_kill); 158test(7, test_store_store); 159