| // Copyright 2018 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 --opt |
| |
| /* Test deopt behaviors when the prototype has elements */ |
| |
| // forEach |
| |
| (function () { |
| var array = [,]; |
| |
| function increment (v, k, arr) { arr[k] = v + 1; } |
| function forEach() { |
| array.forEach(increment); |
| } |
| %PrepareFunctionForOptimization(forEach); |
| forEach(); forEach(); |
| |
| %OptimizeFunctionOnNextCall(forEach); |
| |
| forEach(); |
| assertEquals(array, [,]); |
| |
| array.__proto__.push(5); |
| assertEquals(Object.getOwnPropertyDescriptor(array, 0), undefined); |
| // deopt |
| forEach(); |
| assertNotEquals(Object.getOwnPropertyDescriptor(array, 0), undefined); |
| assertEquals(array[0], 6); // this reads from the prototype |
| })(); |