f226350fcb
PR-URL: https://github.com/nodejs/node/pull/47251 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>
28 lines
599 B
JavaScript
28 lines
599 B
JavaScript
// Copyright 2023 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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//
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// Flags: --maglev --allow-natives-syntax
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function func() {}
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function foo(x) {
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return x instanceof func;
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}
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%PrepareFunctionForOptimization(foo);
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foo();
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foo();
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%OptimizeMaglevOnNextCall(foo);
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foo();
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let custom_has_instance_runs = 0;
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Object.defineProperty(func, Symbol.hasInstance, {
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value: function() {
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custom_has_instance_runs++;
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return true;
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}
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});
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assertTrue(foo());
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assertEquals(custom_has_instance_runs, 1);
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