36 lines
836 B
JavaScript
36 lines
836 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 = 1;
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function foo() {
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return a;
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals(1, foo());
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(1, foo());
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assertOptimized(foo);
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// Tier up to Maglev.
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const topLevel = %GetFunctionForCurrentFrame();
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%PrepareFunctionForOptimization(topLevel);
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// Need a back edge for OSR to happen:
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for (let i = 0; i < 1; ++i) {
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%OptimizeOsr();
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}
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// Change what `a` is. This is executed in Maglev.
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a = 2;
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assertUnoptimized(foo);
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assertEquals(2, foo());
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