| // Copyright 2017 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 --expose-gc | |
| function* gen() {}; | |
| %PrepareFunctionForOptimization(gen); | |
| (function warmup() { | |
| for (var i = 0; i < 100; ++i) { | |
| var g = gen(); | |
| g.p = 42; | |
| } | |
| })(); | |
| gc(); // Ensure no instance alive. | |
| gen(); // Still has unused fields. | |
| %OptimizeFunctionOnNextCall(gen); | |
| gen(); // Was shrunk, boom! |