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PR-URL: https://github.com/nodejs/node/pull/28918 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>
25 lines
496 B
JavaScript
25 lines
496 B
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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var A = {};
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A[Symbol.hasInstance] = function(x) {
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%DeoptimizeFunction(foo);
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return 1;
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};
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var a = {};
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function foo(o) {
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return o instanceof A;
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};
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%PrepareFunctionForOptimization(foo);
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foo(a);
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foo(a);
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assertTrue(foo(a) !== 1);
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%OptimizeFunctionOnNextCall(foo);
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assertTrue(foo(a) !== 1);
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