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); 79
