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PR-URL: https://github.com/nodejs/node/pull/44741 Fixes: https://github.com/nodejs/node/issues/44650 Fixes: https://github.com/nodejs/node/issues/37472 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
28 lines
819 B
JavaScript
28 lines
819 B
JavaScript
// 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 --turbofan
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// https://bugs.chromium.org/p/v8/issues/detail?id=10816
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// When V8 sees a deprecated map, update the IC with its target.
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function A() { this.x = 1 }
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function B() { this.x = 1 }
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function load(o) { return o.x }
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%PrepareFunctionForOptimization(load);
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// Initialize the load IC with the map of A before we deprecate it.
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load(new A());
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const oldB = new B();
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(new A()).x = 1.5; // deprecates map already in FV
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(new B()).x = 1.5; // deprecates map for oldB
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// Should update the load IC with the target of the deprecated map.
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load(oldB);
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%OptimizeFunctionOnNextCall(load);
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load(oldB);
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assertOptimized(load);
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