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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>
44 lines
1.1 KiB
JavaScript
44 lines
1.1 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 = 1;
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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 the same value. This won't invalidate the constness.
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write(1);
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%OptimizeFunctionOnNextCall(write);
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write(1);
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// TODO(v8:13567): The above will deopt `write` immediately, since we don't have
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// the "if the value is the same, don't deopt" check yet.
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// assertOptimized(write);
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// In this variant, `read` is optimized after `write`.
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%PrepareFunctionForOptimization(read);
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assertEquals(1, read());
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%OptimizeFunctionOnNextCall(read);
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assertEquals(1, read());
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assertOptimized(read);
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// This 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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