732ad99e47
PR-URL: https://github.com/nodejs/node/pull/37587 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com>
62 lines
1.2 KiB
JavaScript
62 lines
1.2 KiB
JavaScript
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --expose-gc
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function P() {
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this.a0 = {};
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this.a1 = {};
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this.a2 = {};
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this.a3 = {};
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this.a4 = {};
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}
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function A() {
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}
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var proto = new P();
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A.prototype = proto;
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function foo(o) {
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return o.a0;
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}
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// Ensure |proto| is in old space.
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gc();
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gc();
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gc();
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// Ensure |proto| is marked as "should be fast".
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var o = new A();
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%EnsureFeedbackVectorForFunction(foo);
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foo(o);
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foo(o);
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foo(o);
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assertEquals(!%IsDictPropertyConstTrackingEnabled(),
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%HasFastProperties(proto));
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// Contruct a double value that looks like a tagged pointer.
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var buffer = new ArrayBuffer(8);
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var int32view = new Int32Array(buffer);
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var float64view = new Float64Array(buffer);
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int32view[0] = int32view[1] = 0x40000001;
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var boom = float64view[0];
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// Write new space object.
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proto.a4 = {a: 0};
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// Immediately delete the field.
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delete proto.a4;
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// |proto| must sill be fast.
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assertEquals(!%IsDictPropertyConstTrackingEnabled(),
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%HasFastProperties(proto));
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// Add a double field instead of deleted a4 that looks like a tagged pointer.
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proto.boom = boom;
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// Boom!
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gc();
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