27 lines
675 B
JavaScript
27 lines
675 B
JavaScript
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// 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 --maglev --no-always-turbofan
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var stringWrapper = new String('constant');
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function add(a) {
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return a + stringWrapper;
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}
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%PrepareFunctionForOptimization(add);
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const string = 'first';
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assertEquals('firstconstant', add(string));
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%OptimizeMaglevOnNextCall(add);
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assertEquals('firstconstant', add(string));
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assertTrue(isMaglevved(add));
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// Invalidate the protector.
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stringWrapper.valueOf = () => 'value';
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assertUnoptimized(add);
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assertEquals('firstvalue', add(string));
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