Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 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)); |