Version 3.20.11.1

test/mjsunit/compiler/dead-string-char-code-at.js

-// 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();