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 29 30function dead1(a, b) { 31 var x = %_StringCharFromCode(a); 32 return a; // x is dead code 33} 34 35function dead2(a, b) { 36 var x = %_StringCharFromCode(a); 37 var y = %_StringCharFromCode(b); 38 return a; // x and y are both dead 39} 40 41function dead3(a, b) { 42 a = a ? 11 : 12; 43 b = b ? 13 : 14; 44 var x = %_StringCharFromCode(a); 45 var y = %_StringCharFromCode(b); 46 return a; // x and y are both dead 47} 48 49function test() { 50 assertEquals(33, dead1(33, 32)); 51 assertEquals(33, dead2(33, 32)); 52 assertEquals(11, dead3(33, 32)); 53 54 assertEquals(31, dead1(31, 30)); 55 assertEquals(31, dead2(31, 30)); 56 assertEquals(11, dead3(31, 32)); 57 58 assertEquals(0, dead1(0, 30)); 59 assertEquals(0, dead2(0, 30)); 60 assertEquals(12, dead3(0, 32)); 61 62 assertEquals(true, dead1(true, 0)); 63 assertEquals(true, dead2(true, 0)); 64 assertEquals(11, dead3(true, 0)); 65 66 assertEquals("true", dead1("true", 0)); 67 assertEquals("true", dead2("true", 0)); 68 assertEquals(11, dead3("true", 0)); 69} 70 71test(); 72test(); 73%OptimizeFunctionOnNextCall(dead1); 74%OptimizeFunctionOnNextCall(dead2); 75%OptimizeFunctionOnNextCall(dead3); 76test(); 77