28 lines
824 B
JavaScript
28 lines
824 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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%RuntimeEvaluateREPL('let a = 42;');
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// read() uses LdaGlobal / StaGlobal bytecodes for accessing the top-level
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// `let` variable.
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%RuntimeEvaluateREPL('function read() { ++a; return a; }');
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%PrepareFunctionForOptimization(read);
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assertEquals(43, read());
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%OptimizeFunctionOnNextCall(read);
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assertEquals(44, read());
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assertOptimized(read);
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// `a` was not embedded as a constant to `read`, so changing it won't deopt
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// `read`.
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a = 5;
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assertOptimized(read);
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assertEquals(6, read());
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