32 lines
815 B
JavaScript
32 lines
815 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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// Flags: --allow-natives-syntax --concurrent-inlining
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// Flags: --opt --noalways-opt --noturboprop
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class C {};
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const c = new C;
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const getPrototypeOf = Object.getPrototypeOf;
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function bar(f) {
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return f();
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}
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function foo() {
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return bar(getPrototypeOf.bind(undefined, c));
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}
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%PrepareFunctionForOptimization(foo);
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%PrepareFunctionForOptimization(bar);
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bar(function() {});
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foo();
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%OptimizeFunctionOnNextCall(foo);
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foo();
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assertOptimized(foo);
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c.prop = 42;
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// Assert that the call reducer optimized the call to Object.getPrototypeOf
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// by asserting that foo gets deopted when c's previous map becomes
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// unstable.
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foo();
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assertUnoptimized(foo);
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