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1d29d81c69
PR-URL: https://github.com/nodejs/node/pull/52293 Reviewed-By: Moshe Atlow <moshe@atlow.co.il> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>
40 lines
955 B
JavaScript
40 lines
955 B
JavaScript
// 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: --const-tracking-let --allow-natives-syntax
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// Flags: --turbofan --no-always-turbofan --maglev --no-stress-maglev
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// Flags: --sparkplug --no-always-sparkplug
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// In this variant, the variable doesn't have an initializer.
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let a;
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function read() {
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return a;
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}
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function write(newA) {
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a = newA;
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}
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%PrepareFunctionForOptimization(write);
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write(undefined);
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%OptimizeMaglevOnNextCall(write);
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// Write the same value. This won't invalidate the constness.
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write(undefined);
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%PrepareFunctionForOptimization(read);
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read();
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%OptimizeFunctionOnNextCall(read);
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assertEquals(undefined, read());
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assertOptimized(read);
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// This deopts `write`, then invalidates the constness which deopts `read`.
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write(2);
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assertUnoptimized(write);
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assertUnoptimized(read);
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assertEquals(2, read());
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