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>
54 lines
1.3 KiB
JavaScript
54 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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function g(b) {
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if (b) {
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throw_because_function_not_defined();
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}
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}
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%NeverOptimizeFunction(g);
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function A() {}
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class B extends A {}
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class C {}
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function is_a(o, b) {
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let v = b;
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try {
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v = 13;
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g(b);
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v = 12;
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return o instanceof A;
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} catch (e) {
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return v;
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}
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}
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%PrepareFunctionForOptimization(is_a);
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assertEquals(true, is_a(new B(), false));
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assertEquals(13, is_a(new B(), true));
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assertEquals(true, is_a(new A(), false));
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assertEquals(13, is_a(new A(), true));
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assertEquals(false, is_a(new C(), false));
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assertEquals(13, is_a(new C(), true));
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%OptimizeFunctionOnNextCall(is_a);
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assertEquals(true, is_a(new B(), false));
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assertEquals(13, is_a(new B(), true));
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assertEquals(true, is_a(new A(), false));
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assertEquals(13, is_a(new A(), true));
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assertEquals(false, is_a(new C(), false));
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assertEquals(13, is_a(new C(), true));
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assertOptimized(is_a);
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// Changing manually the prototype of an object.
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let b = new B();
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assertEquals(true, is_a(b, false));
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assertEquals(13, is_a(b, true));
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Object.setPrototypeOf(b, {});
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assertEquals(false, is_a(b, false));
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assertEquals(13, is_a(b, true));
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assertOptimized(is_a);
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