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f579e11940
PR-URL: https://github.com/nodejs/node/pull/26685 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Refael Ackermann <refack@gmail.com>
55 lines
1.6 KiB
JavaScript
55 lines
1.6 KiB
JavaScript
// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax
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// Common pattern in Webpack 3 generated bundles, see
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// https://github.com/webpack/webpack/issues/5600 for details.
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(function ObjectConstructorWithKnownFunction() {
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"use strict";
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class A {
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bar() { return this; }
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};
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function foo(a) {
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return Object(a.bar)();
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals(undefined, foo(new A));
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assertEquals(undefined, foo(new A));
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(undefined, foo(new A));
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})();
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(function ObjectConstructorWithString() {
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"use strict";
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function foo() {
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return Object("a");
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals('object', typeof foo());
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assertEquals('object', typeof foo());
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%OptimizeFunctionOnNextCall(foo);
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assertEquals('object', typeof foo());
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})();
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// Object constructor subclassing via Class Factories, see
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// https://twitter.com/FremyCompany/status/905977048006402048
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// for the hint.
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(function ObjectConstructorSubClassing() {
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"use strict";
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const Factory = Base => class A extends Base {};
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const A = Factory(Object);
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function foo() {
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return new A(1, 2, 3);
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}
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%PrepareFunctionForOptimization(foo);
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assertInstanceof(foo(), A);
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assertInstanceof(foo(), Object);
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assertInstanceof(foo(), A);
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assertInstanceof(foo(), Object);
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%OptimizeFunctionOnNextCall(foo);
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assertInstanceof(foo(), A);
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assertInstanceof(foo(), Object);
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})();
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