| // Copyright 2019 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 |
| |
| function foo(a, i) { |
| a[i] = 1; |
| return a[i]; |
| } |
| |
| class MyArray extends (class C extends Array { |
| }){}; |
| |
| o = new MyArray; |
| |
| %EnsureFeedbackVectorForFunction(foo); |
| // initialize IC |
| assertEquals(1, foo(o, 0)); |
| assertEquals(1, foo(o, 1)); |
| |
| // Change prototype |
| o.__proto__.__proto__ = new Int32Array(2); |
| |
| |
| // Check it still works |
| assertEquals(undefined, foo(o, 2)); |
| assertEquals(undefined, foo(o, 2)); |
