918fe04351
PR-URL: https://github.com/nodejs/node/pull/58070 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
46 lines
1.0 KiB
JavaScript
46 lines
1.0 KiB
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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let a = 0;
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function read() {
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return a;
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}
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%PrepareFunctionForOptimization(read);
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assertEquals(0, read());
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%OptimizeFunctionOnNextCall(read);
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assertEquals(0, read());
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assertOptimized(read);
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function write(newValue) {
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a = newValue;
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}
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%PrepareFunctionForOptimization(write);
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write(0);
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%OptimizeMaglevOnNextCall(write);
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write(0);
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// Invalidate the constness from the outside (of `write`).
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a = 3;
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assertUnoptimized(read);
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assertEquals(3, read());
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// Write was also deoptimized, because it depends on `a` constness.
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assertUnoptimized(write);
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%OptimizeMaglevOnNextCall(write);
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write(1);
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// Now it depends on Sminess of the context slot.
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assertOptimized(write);
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assertEquals(1, read());
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