1fb732b17922ea75830be4db6b80534c4827d8a55jkummerow@chromium.org// Copyright 2013 the V8 project authors. All rights reserved. 27979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// Redistribution and use in source and binary forms, with or without 37979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// modification, are permitted provided that the following conditions are 47979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// met: 57979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// 67979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// * Redistributions of source code must retain the above copyright 77979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// notice, this list of conditions and the following disclaimer. 87979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// * Redistributions in binary form must reproduce the above 97979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// copyright notice, this list of conditions and the following 107979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// disclaimer in the documentation and/or other materials provided 117979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// with the distribution. 127979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// * Neither the name of Google Inc. nor the names of its 137979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// contributors may be used to endorse or promote products derived 147979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// from this software without specific prior written permission. 157979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// 167979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 177979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 187979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 197979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 207979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 217979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 227979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 237979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 247979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 257979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 267979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 277979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org 28935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org// Flags: --allow-natives-syntax 297979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org 30935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgvar S1 = "string1"; 31935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgvar S2 = "@@string2"; 327ca89addc38b7479d2d7526d2043283ab7480ffcdanno@chromium.org 33935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgfunction dead1(a, b) { 34935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org var x = %StringCharCodeAt(a, 4); 35935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org return a; // x is dead code 36935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org} 377979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org 38935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgfunction dead2(a, b) { 39935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org var x = %StringCharCodeAt(a, 3); 40935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org var y = %StringCharCodeAt(b, 1); 41935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org return a; // x and y are both dead 42fb732b17922ea75830be4db6b80534c4827d8a55jkummerow@chromium.org} 437979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org 44935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgfunction dead3(a, b) { 45935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org a = a ? "11" : "12"; 46935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org b = b ? "13" : "14"; 47935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org var x = %StringCharCodeAt(a, 2); 48935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org var y = %StringCharCodeAt(b, 0); 49935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org return a; // x and y are both dead 507979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org} 517979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org 52935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgfunction test() { 53935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org var S3 = S1 + S2; 54935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org 55935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals(S1, dead1(S1, S2)); 56935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals(S1, dead2(S1, S2)); 57935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals("11", dead3(S1, S2)); 58fb732b17922ea75830be4db6b80534c4827d8a55jkummerow@chromium.org 59935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals(S2, dead1(S2, 677)); 60935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals(S2, dead2(S2, S3)); 61935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals("11", dead3(S2, S3)); 627979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org 63935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals(S3, dead1(S3, 399)); 64935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals(S3, dead2(S3, "false")); 65935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals("12", dead3(0, 32)); 66935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org 67935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals(S3, dead1(S3, 0)); 68935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals(S3, dead2(S3, S1)); 69935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals("11", dead3(S3, 0)); 70935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org 71935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals("true", dead1("true", 0)); 72935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals("true", dead2("true", S3)); 73935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org assertEquals("11", dead3("true", 0)); 74935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org} 757979bbb1df2eaff193e85d44c8da1ffa1525b7fcfschneider@chromium.org 76935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgtest(); 77935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgtest(); 78935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org%OptimizeFunctionOnNextCall(dead1); 79935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org%OptimizeFunctionOnNextCall(dead2); 80935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.org%OptimizeFunctionOnNextCall(dead3); 81935781b3604caa053bf75ce6b1079d79a225e63fdanno@chromium.orgtest(); 82