25 lines
572 B
JavaScript
25 lines
572 B
JavaScript
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// Copyright 2021 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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function C(a, b) {
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this.a = a;
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this.b = b;
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}
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var c = new C(42, 4.2);
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var cc = new C(4.2, 42);
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function foo() { return cc.a }
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%PrepareFunctionForOptimization(foo);
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assertEquals(4.2, foo());
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// Transition representation of 'a' from Double to Tagged.
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Object.defineProperty(c, 'a', { value: undefined });
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(4.2, foo());
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