1// Copyright 2012 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 --always-opt --expose-gc 29 30// Test that the elements kind of the boilerplate object is sufficiently 31// checked in LFastLiteral, so that unoptimized code can transition the 32// boilerplate. The --always-opt flag makes sure that optimized code is 33// not thrown away at deoptimization. 34 35// The switch statement in f() makes sure that f() is not inlined. If we 36// start inlining switch statements, we will still catch the bug on the 37// final --stress-opt run. 38 39function f(x) { 40 switch(x) { 41 case 1: return 1.4; 42 case 2: return 1.5; 43 case 3: return {}; 44 default: gc(); 45 } 46} 47 48function g(x) { 49 return [1.1, 1.2, 1.3, f(x)]; 50} 51 52// Step 1: Optimize g() to contain a FAST_DOUBLE_ELEMENTS boilerplate. 53assertEquals([1.1, 1.2, 1.3, 1.4], g(1)); 54assertEquals([1.1, 1.2, 1.3, 1.5], g(2)); 55%OptimizeFunctionOnNextCall(g); 56 57// Step 2: Deoptimize g() and transition to FAST_ELEMENTS boilerplate. 58assertEquals([1.1, 1.2, 1.3, {}], g(3)); 59 60// Step 3: Cause a GC while broken clone of boilerplate is on the heap, 61// hence causing heap verification to catch it. 62assertEquals([1.1, 1.2, 1.3, undefined], g(4)); 63