28 lines
716 B
JavaScript
28 lines
716 B
JavaScript
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// Copyright 2019 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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//
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// Flags: --allow-natives-syntax
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// A function with a for-in loop, that will be optimized.
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function foo(o) {
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for (var i in o) {
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return o[i];
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}
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}
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var o = { x: 0.5 };
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// Warm up foo with Double values in the enum cache.
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%PrepareFunctionForOptimization(foo);
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assertEquals(foo(o), 0.5);
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assertEquals(foo(o), 0.5);
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(foo(o), 0.5);
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// Transition the double field to a tagged field
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o.x = "abc";
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// Make sure that the optimized code correctly loads the tagged field.
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assertEquals(foo(o), "abc");
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