527754fbae
For dictionary mode objects, whether or not a property is constant was not tracked before. This CL makes the required non-Turbofan changes, guarded behind the new flag V8_DICT_PROPERTY_CONST_TRACKING. In addition, prototypes are not converted to fast mode objects if this flags is enabled. Bug: v8:11247 Change-Id: Ia5942733239a97560b6efc015f0e25a35fea3d7a Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2566757 Commit-Queue: Frank Emrich <emrich@google.com> Reviewed-by: Igor Sheludko <ishell@chromium.org> Reviewed-by: Marja Hölttä <marja@chromium.org> Cr-Commit-Position: refs/heads/master@{#72524}
67 lines
1.8 KiB
JavaScript
67 lines
1.8 KiB
JavaScript
// Copyright 2014 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
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// Test loading existent and nonexistent properties from dictionary
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// mode objects.
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function SlowObject() {
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this.foo = 1;
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this.bar = 2;
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this.qux = 3;
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this.z = 4;
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delete this.qux;
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assertFalse(%HasFastProperties(this));
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}
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function SlowObjectWithBaz() {
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var o = new SlowObject();
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o.baz = 4;
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return o;
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}
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function Load(o) {
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return o.baz;
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}
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for (var i = 0; i < 10; i++) {
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var o1 = new SlowObject();
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var o2 = SlowObjectWithBaz();
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assertEquals(undefined, Load(o1));
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assertEquals(4, Load(o2));
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}
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// Test objects getting optimized as fast prototypes.
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function SlowPrototype() {
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this.foo = 1;
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}
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SlowPrototype.prototype.bar = 2;
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SlowPrototype.prototype.baz = 3;
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SlowPrototype.prototype.z = 4;
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delete SlowPrototype.prototype.baz;
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assertFalse(%HasFastProperties(SlowPrototype.prototype));
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var slow_proto = new SlowPrototype;
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// ICs make prototypes fast.
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function ic() { return slow_proto.bar; }
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ic();
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ic();
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assertEquals(!%IsDictPropertyConstTrackingEnabled(),
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%HasFastProperties(slow_proto.__proto__));
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// Prototypes stay fast even after deleting properties.
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assertEquals(!%IsDictPropertyConstTrackingEnabled(),
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%HasFastProperties(SlowPrototype.prototype));
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var fast_proto = new SlowPrototype();
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assertEquals(!%IsDictPropertyConstTrackingEnabled(),
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%HasFastProperties(SlowPrototype.prototype));
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assertEquals(!%IsDictPropertyConstTrackingEnabled(),
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%HasFastProperties(fast_proto.__proto__));
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if (!%IsDictPropertyConstTrackingEnabled()) {
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assertTrue(%HasFastProperties(SlowPrototype.prototype));
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assertTrue(%HasFastProperties(fast_proto.__proto__));
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}
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