Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | function Receiver() { this.receiver = "receiver"; } |
| 6 | function Proto() { this.proto = "proto"; } |
| 7 | |
| 8 | function f(a) { |
| 9 | return a.foo; |
| 10 | } |
| 11 | |
| 12 | var rec = new Receiver(); |
| 13 | |
| 14 | var proto = rec.__proto__.__proto__; |
| 15 | |
| 16 | // Initialize prototype chain dependent IC (nonexistent load). |
| 17 | assertEquals(undefined, f(rec)); |
| 18 | assertEquals(undefined, f(rec)); |
| 19 | |
| 20 | // Add a new prototype to the end of the chain. |
| 21 | var p2 = new Proto(); |
| 22 | p2.__proto__ = null; |
| 23 | proto.__proto__ = p2; |
| 24 | |
| 25 | // Update the IC. |
| 26 | assertEquals(undefined, f(rec)); |
| 27 | |
| 28 | // Now modify the most recently added prototype by adding a property... |
| 29 | p2.foo = "bar"; |
| 30 | assertEquals("bar", f(rec)); |
| 31 | |
| 32 | // ...and removing it again. Due to missing prototype user registrations, |
| 33 | // this fails to invalidate the IC. |
| 34 | delete p2.foo; |
| 35 | p2.secret = "GAME OVER"; |
| 36 | assertEquals(undefined, f(rec)); |