fd5640cf7a
Generates inlined code for object allocation specific to the initial map of the given constructor function. Also forces completion of inobject slack tracking while crankshafting to finalize instance size of these objects. R=vegorov@chromium.org TEST=mjsunit/compiler/alloc-object Review URL: https://chromiumcodereview.appspot.com/9370019 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10881 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
91 lines
3.3 KiB
JavaScript
91 lines
3.3 KiB
JavaScript
// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --allow-natives-syntax --expose-gc --inline-construct
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// Test that inlined object allocation works for different layouts of
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// objects (e.g. in object properties, slack tracking in progress or
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// changing of function prototypes)
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function test_helper(construct, a, b) {
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return new construct(a, b);
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}
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function test(construct) {
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%DeoptimizeFunction(test);
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test_helper(construct, 0, 0);
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test_helper(construct, 0, 0);
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%OptimizeFunctionOnNextCall(test_helper);
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// Test adding a new property after allocation was inlined.
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var o = test_helper(construct, 1, 2);
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o.z = 3;
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assertEquals(1, o.x);
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assertEquals(2, o.y);
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assertEquals(3, o.z);
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// Test changing the prototype after allocation was inlined.
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construct.prototype = { z:6 };
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var o = test_helper(construct, 4, 5);
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assertEquals(4, o.x);
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assertEquals(5, o.y);
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assertEquals(6, o.z);
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%DeoptimizeFunction(test_helper);
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gc(); // Makes V8 forget about type information for test_helper.
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}
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function finalize_slack_tracking(construct) {
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// Value chosen based on kGenerousAllocationCount = 8.
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for (var i = 0; i < 8; i++) {
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new construct(0, 0);
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}
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}
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// Both properties are pre-allocated in object properties.
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function ConstructInObjectPreAllocated(a, b) {
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this.x = a;
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this.y = b;
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}
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finalize_slack_tracking(ConstructInObjectPreAllocated);
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test(ConstructInObjectPreAllocated);
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// Both properties are unused in object properties.
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function ConstructInObjectUnused(a, b) {
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this.x = a < 0 ? 0 : a;
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this.y = b > 0 ? b : 0;
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}
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finalize_slack_tracking(ConstructInObjectUnused);
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test(ConstructInObjectUnused);
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// Test inlined allocation while slack tracking is still in progress.
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function ConstructWhileSlackTracking(a, b) {
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this.x = a;
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this.y = b;
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}
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test(ConstructWhileSlackTracking);
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