blob: 71e51ee2abaa93973d336fd405dff89632a246cb [file] [log] [blame]
// 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
// Common pattern in Webpack 3 generated bundles, see
// https://github.com/webpack/webpack/issues/5600 for details.
(function ObjectConstructorWithKnownFunction() {
"use strict";
class A {
bar() { return this; }
};
function foo(a) {
return Object(a.bar)();
}
%PrepareFunctionForOptimization(foo);
assertEquals(undefined, foo(new A));
assertEquals(undefined, foo(new A));
%OptimizeFunctionOnNextCall(foo);
assertEquals(undefined, foo(new A));
})();
(function ObjectConstructorWithString() {
"use strict";
function foo() {
return Object("a");
}
%PrepareFunctionForOptimization(foo);
assertEquals('object', typeof foo());
assertEquals('object', typeof foo());
%OptimizeFunctionOnNextCall(foo);
assertEquals('object', typeof foo());
})();
// Object constructor subclassing via Class Factories, see
// https://twitter.com/FremyCompany/status/905977048006402048
// for the hint.
(function ObjectConstructorSubClassing() {
"use strict";
const Factory = Base => class A extends Base {};
const A = Factory(Object);
function foo() {
return new A(1, 2, 3);
}
%PrepareFunctionForOptimization(foo);
assertInstanceof(foo(), A);
assertInstanceof(foo(), Object);
assertInstanceof(foo(), A);
assertInstanceof(foo(), Object);
%OptimizeFunctionOnNextCall(foo);
assertInstanceof(foo(), A);
assertInstanceof(foo(), Object);
})();