| // Copyright 2020 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: --no-lazy-feedback-allocation |
| |
| function store(ar, index) { |
| ar[index] = "a"; |
| } |
| |
| let growable_array = []; |
| |
| // Train IC on growable array |
| store(growable_array, 0); |
| store(growable_array, 1); |
| store(growable_array, 2); |
| store(growable_array, 3); |
| |
| // Now make IC polymorphic |
| var array = []; |
| Object.defineProperty(array, "length", { value: 3, writable: false }); |
| |
| store(array, 0); |
| store(array, 1); |
| |
| // ... and try to grow it. |
| store(array, 3); |
| assertEquals(undefined, array[3]); |
| assertEquals(3, array.length); |
