| // 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 */ |
| |
| // slice |
| |
| (function () { |
| var array = [,]; |
| |
| function slice() { |
| return array.slice(); |
| } |
| |
| %PrepareFunctionForOptimization(slice); |
| slice(); slice(); |
| |
| %OptimizeFunctionOnNextCall(slice); |
| |
| assertEquals(slice(), [,]); |
| |
| array.__proto__.push(5); |
| // deopt |
| var narr = slice(); |
| assertNotEquals(Object.getOwnPropertyDescriptor(narr, 0), undefined); |
| assertEquals(narr[0], 5); |
| })(); |