918fe04351
PR-URL: https://github.com/nodejs/node/pull/58070 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
// Copyright 2024 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 --turbolev --turbofan
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// Testing instanceof and builtin continuations.
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// (copy-pasted from test/mjsunit/maglev/nested-continuations.js)
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function Foo() {}
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Object.defineProperty(Foo, Symbol.hasInstance, { value: Math.round });
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let foo = new Foo();
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function test_instanceof_foo(f) {
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// `f instanceof Foo` runs `%ToBoolean(Foo[Symbol.hasInstance](f))`, where
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// `Foo[Symbol.hasInstance]` is `Math.round`.
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//
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// So with sufficient builtin inlining, this will call
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// `%ToBoolean(round(%ToNumber(f)))`, which will call `f.valueOf`. If this
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// deopts (which in this test it will), we need to make sure to both round it,
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// and then convert that rounded value to a boolean.
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return f instanceof Foo;
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}
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foo.valueOf = () => {
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%DeoptimizeFunction(test_instanceof_foo);
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// Return a value which, when rounded, has ToBoolean false, and when not
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// rounded, has ToBoolean true.
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return 0.2;
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}
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%PrepareFunctionForOptimization(test_instanceof_foo);
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assertFalse(test_instanceof_foo(foo));
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assertFalse(test_instanceof_foo(foo));
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%OptimizeFunctionOnNextCall(test_instanceof_foo);
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assertFalse(test_instanceof_foo(foo));
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