37 lines
961 B
JavaScript
37 lines
961 B
JavaScript
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// Copyright 2015 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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function Receiver() { this.receiver = "receiver"; }
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function Proto() { this.proto = "proto"; }
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function f(a) {
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return a.foo;
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}
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var rec = new Receiver();
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var proto = rec.__proto__.__proto__;
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// Initialize prototype chain dependent IC (nonexistent load).
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assertEquals(undefined, f(rec));
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assertEquals(undefined, f(rec));
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// Add a new prototype to the end of the chain.
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var p2 = new Proto();
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p2.__proto__ = null;
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proto.__proto__ = p2;
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// Update the IC.
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assertEquals(undefined, f(rec));
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// Now modify the most recently added prototype by adding a property...
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p2.foo = "bar";
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assertEquals("bar", f(rec));
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// ...and removing it again. Due to missing prototype user registrations,
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// this fails to invalidate the IC.
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delete p2.foo;
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p2.secret = "GAME OVER";
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assertEquals(undefined, f(rec));
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