| // 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 */ |
| |
| // map |
| |
| (function () { |
| var array = [,]; |
| |
| function map() { |
| return array.map(x => x + 1); |
| } |
| |
| %PrepareFunctionForOptimization(map); |
| map(); map(); |
| |
| %OptimizeFunctionOnNextCall(map); |
| |
| assertEquals(map(), [,]); |
| |
| array.__proto__.push(5); |
| // deopt |
| var narr = map(); |
| assertNotEquals(Object.getOwnPropertyDescriptor(narr, 0), undefined); |
| assertEquals(narr[0], 6); |
| })(); |