| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // Flags: --allow-natives-syntax |
| |
| var S1 = "string1"; |
| var S2 = "@@string2"; |
| |
| function dead1(a, b) { |
| var x = %_StringCharCodeAt(a, 4); |
| return a; // x is dead code |
| } |
| |
| function dead2(a, b) { |
| var x = %_StringCharCodeAt(a, 3); |
| var y = %_StringCharCodeAt(b, 1); |
| return a; // x and y are both dead |
| } |
| |
| function dead3(a, b) { |
| a = a ? "11" : "12"; |
| b = b ? "13" : "14"; |
| var x = %_StringCharCodeAt(a, 2); |
| var y = %_StringCharCodeAt(b, 0); |
| return a; // x and y are both dead |
| } |
| |
| function test() { |
| var S3 = S1 + S2; |
| |
| assertEquals(S1, dead1(S1, S2)); |
| assertEquals(S1, dead2(S1, S2)); |
| assertEquals("11", dead3(S1, S2)); |
| |
| assertEquals(S2, dead1(S2, 677)); |
| assertEquals(S2, dead2(S2, S3)); |
| assertEquals("11", dead3(S2, S3)); |
| |
| assertEquals(S3, dead1(S3, 399)); |
| assertEquals(S3, dead2(S3, "false")); |
| assertEquals("12", dead3(0, 32)); |
| |
| assertEquals(S3, dead1(S3, 0)); |
| assertEquals(S3, dead2(S3, S1)); |
| assertEquals("11", dead3(S3, 0)); |
| |
| assertEquals("true", dead1("true", 0)); |
| assertEquals("true", dead2("true", S3)); |
| assertEquals("11", dead3("true", 0)); |
| } |
| |
| test(); |
| test(); |
| %OptimizeFunctionOnNextCall(dead1); |
| %OptimizeFunctionOnNextCall(dead2); |
| %OptimizeFunctionOnNextCall(dead3); |
| test(); |