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Edit File: regress-fast-literal-transition.js
// Copyright 2012 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 --always-opt --expose-gc // Test that the elements kind of the boilerplate object is sufficiently // checked in LFastLiteral, so that unoptimized code can transition the // boilerplate. The --always-opt flag makes sure that optimized code is // not thrown away at deoptimization. // The switch statement in f() makes sure that f() is not inlined. If we // start inlining switch statements, we will still catch the bug on the // final --stress-opt run. function f(x) { switch(x) { case 1: return 1.4; case 2: return 1.5; case 3: return {}; default: gc(); } } function g(x) { return [1.1, 1.2, 1.3, f(x)]; } // Step 1: Optimize g() to contain a FAST_DOUBLE_ELEMENTS boilerplate. assertEquals([1.1, 1.2, 1.3, 1.4], g(1)); assertEquals([1.1, 1.2, 1.3, 1.5], g(2)); %OptimizeFunctionOnNextCall(g); // Step 2: Deoptimize g() and transition to FAST_ELEMENTS boilerplate. assertEquals([1.1, 1.2, 1.3, {}], g(3)); // Step 3: Cause a GC while broken clone of boilerplate is on the heap, // hence causing heap verification to catch it. assertEquals([1.1, 1.2, 1.3, undefined], g(4));