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| 1 // Copyright 2010 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 // Regression test for bugs when deoptimizing after assignments in effect |
| 29 // contexts. |
| 30 |
| 31 // Bug 989 is that there was an extra value on the expression stack when |
| 32 // deoptimizing after an assignment in effect context (the value of the |
| 33 // assignment was lingering). This is hard to observe in the unoptimized |
| 34 // code. |
| 35 // |
| 36 // This test uses comma expressions to put assignments in effect contexts, |
| 37 // references to deleted global variables to force deoptimization, and |
| 38 // function calls to observe an extra value. |
| 39 |
| 40 function first(x, y) { return x; } |
| 41 var y = 0; |
| 42 var o = {}; |
| 43 o.x = 0; |
| 44 o[0] = 0; |
| 45 |
| 46 // Assignment to global variable. |
| 47 x0 = 0; |
| 48 function test0() { return first((y = 1, typeof x0), 2); } |
| 49 // Call the function once to compile it. |
| 50 assertEquals('number', test0()); |
| 51 // Delete to force deoptimization on the next call. |
| 52 delete x0; |
| 53 assertEquals('undefined', test0()); |
| 54 |
| 55 // Compound assignment to global variable. |
| 56 x1 = 0; |
| 57 function test1() { return first((y += 1, typeof x1), 2); } |
| 58 assertEquals('number', test1(), 'test1 before'); |
| 59 delete x1; |
| 60 assertEquals('undefined', test1(), 'test1 after'); |
| 61 |
| 62 // Pre and post-increment of global variable. |
| 63 x2 = 0; |
| 64 function test2() { return first((++y, typeof x2), 2); } |
| 65 assertEquals('number', test2(), 'test2 before'); |
| 66 delete x2; |
| 67 assertEquals('undefined', test2(), 'test2 after'); |
| 68 |
| 69 x3 = 0; |
| 70 function test3() { return first((y++, typeof x3), 2); } |
| 71 assertEquals('number', test3(), 'test3 before'); |
| 72 delete x3; |
| 73 assertEquals('undefined', test3(), 'test3 after'); |
| 74 |
| 75 |
| 76 // Assignment, compound assignment, and pre and post-increment of named |
| 77 // properties. |
| 78 x4 = 0; |
| 79 function test4() { return first((o.x = 1, typeof x4), 2); } |
| 80 assertEquals('number', test4()); |
| 81 delete x4; |
| 82 assertEquals('undefined', test4()); |
| 83 |
| 84 x5 = 0; |
| 85 function test5() { return first((o.x += 1, typeof x5), 2); } |
| 86 assertEquals('number', test5()); |
| 87 delete x5; |
| 88 assertEquals('undefined', test5()); |
| 89 |
| 90 x6 = 0; |
| 91 function test6() { return first((++o.x, typeof x6), 2); } |
| 92 assertEquals('number', test6()); |
| 93 delete x6; |
| 94 assertEquals('undefined', test6()); |
| 95 |
| 96 x7 = 0; |
| 97 function test7() { return first((o.x++, typeof x7), 2); } |
| 98 assertEquals('number', test7()); |
| 99 delete x7; |
| 100 assertEquals('undefined', test7()); |
| 101 |
| 102 |
| 103 // Assignment, compound assignment, and pre and post-increment of indexed |
| 104 // properties. |
| 105 x8 = 0; |
| 106 function test8(index) { return first((o[index] = 1, typeof x8), 2); } |
| 107 assertEquals('number', test8()); |
| 108 delete x8; |
| 109 assertEquals('undefined', test8()); |
| 110 |
| 111 x9 = 0; |
| 112 function test9(index) { return first((o[index] += 1, typeof x9), 2); } |
| 113 assertEquals('number', test9()); |
| 114 delete x9; |
| 115 assertEquals('undefined', test9()); |
| 116 |
| 117 x10 = 0; |
| 118 function test10(index) { return first((++o[index], typeof x10), 2); } |
| 119 assertEquals('number', test10()); |
| 120 delete x10; |
| 121 assertEquals('undefined', test10()); |
| 122 |
| 123 x11 = 0; |
| 124 function test11(index) { return first((o[index]++, typeof x11), 2); } |
| 125 assertEquals('number', test11()); |
| 126 delete x11; |
| 127 assertEquals('undefined', test11()); |
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