| // 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 */ |
| |
| // reduce |
| |
| (function () { |
| var array = [, 3]; |
| |
| function accumulate (prev, cur, curIdx, arr) { arr[curIdx] = cur + prev; } |
| function reduce() { |
| array.reduce(accumulate); |
| } |
| |
| %PrepareFunctionForOptimization(reduce); |
| reduce(); reduce(); |
| |
| %OptimizeFunctionOnNextCall(reduce); |
| |
| reduce(); |
| assertEquals(array, [,3]); |
| |
| array.__proto__.push(3); |
| // deopt |
| reduce(); |
| assertEquals(array, [, 6]); |
| assertEquals(Object.getOwnPropertyDescriptor(array, 0), undefined); |
| })(); |