| // 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: --allow-natives-syntax |
| |
| function IsDataView(obj) { |
| return obj.getFloat64; |
| } |
| %NeverOptimizeFunction(IsDataView); |
| |
| function bar(obj) { |
| if (IsDataView(obj)) obj.getFloat64(0); |
| } |
| |
| %PrepareFunctionForOptimization(bar); |
| bar(new DataView(new ArrayBuffer(42))); |
| |
| const proxy = new Proxy({}, {}); |
| function foo() { bar(proxy) } |
| |
| %PrepareFunctionForOptimization(foo); |
| foo(); |
| |
| %OptimizeFunctionOnNextCall(foo); |
| foo(); |
