Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 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. |
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| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 28 | // Flags: --allow-natives-syntax |
| 29 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 30 | // Regression test for failure to deoptimize properly when the most recent |
| 31 | // side effect occurred in a comma expression in an effect context. |
| 32 | |
| 33 | // An unoptimizable function, calling it is a side effect. |
| 34 | function side_effect() { try {} finally {} return "wrong"; } |
| 35 | |
| 36 | // A function to observe the value of its first argument. |
| 37 | function observe(x, y) { try {} finally {} return x; } |
| 38 | |
| 39 | // If we optimize for x a smi, then x a string will deopt. The side effect |
| 40 | // immediately before the deopt is in a comma expresion in an effect context |
| 41 | // (i.e., itself the left subexpression of a comma expression). |
| 42 | function test(x) { return observe(this, ((0, side_effect()), x + 1)); } |
| 43 | |
| 44 | // Run test enough times to get it optimized. |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 45 | for (var i = 0; i < 5; ++i) test(0); |
| 46 | %OptimizeFunctionOnNextCall(test); |
| 47 | test(0); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 48 | |
| 49 | // Force test to deopt. If it behaves normally, it should return the global |
| 50 | // object. If the value of the call to side_effect() is lingering after the |
| 51 | // deopt, it will return the string "wrong". |
| 52 | assertFalse(test("a") === "wrong"); |