ea04708ee9
We need to hold onto the bytecode array so it doesn't get flushed. Bug: v8:8394 Change-Id: Ia583a0a662740e369fcbc1c94041895e463be26e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1645329 Commit-Queue: Mythri Alle <mythria@chromium.org> Auto-Submit: Mythri Alle <mythria@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#62011}
59 lines
1.1 KiB
JavaScript
59 lines
1.1 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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assertTrue(%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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assertTrue(%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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