27 lines
588 B
JavaScript
27 lines
588 B
JavaScript
|
// 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();
|