25 lines
556 B
JavaScript
25 lines
556 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
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function foo(o) {
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return "x" in o;
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}
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%PrepareFunctionForOptimization(foo);
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let o1 = new String("abc");
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assertEquals(false, foo(o1));
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let o2 = new String("def");
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o2.x = 17;
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assertEquals(true, foo(o2));
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print(foo(o2));
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%OptimizeFunctionOnNextCall(foo);
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let o3 = new String("ghi");
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assertEquals(false, foo(o3));
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o3.x = 42;
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assertEquals(true, foo(o3));
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