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 39 function 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 48 function 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. 53 assertEquals([1.1, 1.2, 1.3, 1.4], g(1)); 54 assertEquals([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. 58 assertEquals([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. 62 assertEquals([1.1, 1.2, 1.3, undefined], g(4)); 63
