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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>
45 lines
1.1 KiB
JavaScript
45 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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// Like const-tracking-let-already-not-constant-no-deopt-maglev, but we use
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// the StaGlobal bytecode in `write`.
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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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%RuntimeEvaluateREPL('function write(newA) { a = newA; }');
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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 won't deopt, since the value it's writing to is already not a constant.
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write(1);
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assertOptimized(write);
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assertUnoptimized(read);
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assertEquals(1, read());
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