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Edit File: alloc-object.js
// Copyright 2012 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Flags: --allow-natives-syntax --expose-gc --inline-construct // Test that inlined object allocation works for different layouts of // objects (e.g. in object properties, slack tracking in progress or // changing of function prototypes) function test_helper(construct, a, b) { return new construct(a, b); } function test(construct) { %DeoptimizeFunction(test); test_helper(construct, 0, 0); test_helper(construct, 0, 0); %OptimizeFunctionOnNextCall(test_helper); // Test adding a new property after allocation was inlined. var o = test_helper(construct, 1, 2); o.z = 3; assertEquals(1, o.x); assertEquals(2, o.y); assertEquals(3, o.z); // Test changing the prototype after allocation was inlined. construct.prototype = { z:6 }; var o = test_helper(construct, 4, 5); assertEquals(4, o.x); assertEquals(5, o.y); assertEquals(6, o.z); %DeoptimizeFunction(test_helper); gc(); // Makes V8 forget about type information for test_helper. } function finalize_slack_tracking(construct) { // Value chosen based on kGenerousAllocationCount = 8. for (var i = 0; i < 8; i++) { new construct(0, 0); } } // Both properties are pre-allocated in object properties. function ConstructInObjectPreAllocated(a, b) { this.x = a; this.y = b; } finalize_slack_tracking(ConstructInObjectPreAllocated); test(ConstructInObjectPreAllocated); // Both properties are unused in object properties. function ConstructInObjectUnused(a, b) { this.x = a < 0 ? 0 : a; this.y = b > 0 ? b : 0; } finalize_slack_tracking(ConstructInObjectUnused); test(ConstructInObjectUnused); // Test inlined allocation while slack tracking is still in progress. function ConstructWhileSlackTracking(a, b) { this.x = a; this.y = b; } test(ConstructWhileSlackTracking);