40 lines
933 B
JavaScript
40 lines
933 B
JavaScript
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// 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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// write() uses the StaGlobal bytecode for writing the top-level `let` variable.
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%RuntimeEvaluateREPL('function write(newA) { a = newA; }');
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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(0);
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%CompileBaseline(write);
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write(0);
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assertEquals(0, read());
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assertOptimized(read);
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write(1);
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assertUnoptimized(read);
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assertEquals(1, read());
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