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| 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 |
| 29 |
| 30 // Test that boilerplate objects for array literals with non-constant |
| 31 // elements (which will contain the hole at non-constant positions) will |
| 32 // not cause prototype chain lookups when generating optimized code. |
| 33 |
| 34 function f(x) { |
| 35 return [x][0]; |
| 36 } |
| 37 |
| 38 // Test data element on prototype. |
| 39 Object.prototype[0] = 23; |
| 40 assertSame(1, f(1)); |
| 41 assertSame(2, f(2)); |
| 42 %OptimizeFunctionOnNextCall(f); |
| 43 assertSame(3, f(3)); |
| 44 %DeoptimizeFunction(f); |
| 45 |
| 46 // Test accessor element on prototype. |
| 47 Object.prototype.__defineGetter__(0, function() { throw Error(); }); |
| 48 assertSame(4, f(4)); |
| 49 assertSame(5, f(5)); |
| 50 %OptimizeFunctionOnNextCall(f); |
| 51 assertSame(6, f(6)); |
| 52 %DeoptimizeFunction(f); |
| 53 |
| 54 // Test the same on boilerplate objects for object literals that contain |
| 55 // both non-constant properties and non-constant elements. |
| 56 |
| 57 function g(x, y) { |
| 58 var o = { foo:x, 0:y }; |
| 59 return o.foo + o[0]; |
| 60 } |
| 61 |
| 62 // Test data property and element on prototype. |
| 63 Object.prototype[0] = 23; |
| 64 Object.prototype.foo = 42; |
| 65 assertSame(3, g(1, 2)); |
| 66 assertSame(5, g(2, 3)); |
| 67 %OptimizeFunctionOnNextCall(g); |
| 68 assertSame(7, g(3, 4)); |
| 69 %DeoptimizeFunction(g); |
| 70 |
| 71 // Test accessor property and element on prototype. |
| 72 Object.prototype.__defineGetter__(0, function() { throw Error(); }); |
| 73 Object.prototype.__defineGetter__('foo', function() { throw Error(); }); |
| 74 assertSame(3, g(1, 2)); |
| 75 assertSame(5, g(2, 3)); |
| 76 %OptimizeFunctionOnNextCall(g); |
| 77 assertSame(7, g(3, 4)); |
| 78 %DeoptimizeFunction(g); |
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