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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
// Test loading existent and nonexistent properties from dictionary
// mode objects.
function SlowObject() {
this.foo = 1;
this.bar = 2;
this.qux = 3;
this.z = 4;
delete this.qux;
assertFalse(%HasFastProperties(this));
}
function SlowObjectWithBaz() {
var o = new SlowObject();
o.baz = 4;
return o;
}
function Load(o) {
return o.baz;
}
for (var i = 0; i < 10; i++) {
var o1 = new SlowObject();
var o2 = SlowObjectWithBaz();
assertEquals(undefined, Load(o1));
assertEquals(4, Load(o2));
}
// Test objects getting optimized as fast prototypes.
function SlowPrototype() {
this.foo = 1;
}
SlowPrototype.prototype.bar = 2;
SlowPrototype.prototype.baz = 3;
SlowPrototype.prototype.z = 4;
delete SlowPrototype.prototype.baz;
assertFalse(%HasFastProperties(SlowPrototype.prototype));
var slow_proto = new SlowPrototype;
// ICs make prototypes fast.
function ic() { return slow_proto.bar; }
ic();
ic();
assertEquals(!%IsDictPropertyConstTrackingEnabled(),
%HasFastProperties(slow_proto.__proto__));
// Prototypes stay fast even after deleting properties.
assertEquals(!%IsDictPropertyConstTrackingEnabled(),
%HasFastProperties(SlowPrototype.prototype));
var fast_proto = new SlowPrototype();
assertEquals(!%IsDictPropertyConstTrackingEnabled(),
%HasFastProperties(SlowPrototype.prototype));
assertEquals(!%IsDictPropertyConstTrackingEnabled(),
%HasFastProperties(fast_proto.__proto__));
if (!%IsDictPropertyConstTrackingEnabled()) {
assertTrue(%HasFastProperties(SlowPrototype.prototype));
assertTrue(%HasFastProperties(fast_proto.__proto__));
}
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