35 lines
824 B
JavaScript
35 lines
824 B
JavaScript
|
// Copyright 2024 the V8 project authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style license that can be
|
||
|
|
// found in the LICENSE file.
|
||
|
|
|
||
|
|
// Flags: --const-tracking-let --allow-natives-syntax
|
||
|
|
// Flags: --turbofan --no-always-turbofan --maglev --no-stress-maglev
|
||
|
|
// Flags: --sparkplug --no-always-sparkplug
|
||
|
|
|
||
|
|
let a = 1;
|
||
|
|
|
||
|
|
function read() {
|
||
|
|
return a;
|
||
|
|
}
|
||
|
|
|
||
|
|
function write(newA) {
|
||
|
|
a = newA;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Write the same value. This won't invalidate the constness.
|
||
|
|
write(1);
|
||
|
|
|
||
|
|
// In this variant, `read` is optimized after `write` is called.
|
||
|
|
%PrepareFunctionForOptimization(read);
|
||
|
|
assertEquals(1, read());
|
||
|
|
|
||
|
|
%OptimizeFunctionOnNextCall(read);
|
||
|
|
assertEquals(1, read());
|
||
|
|
assertOptimized(read);
|
||
|
|
|
||
|
|
// Change what `a` is. This is executed in interpreter.
|
||
|
|
write(2);
|
||
|
|
|
||
|
|
assertUnoptimized(read);
|
||
|
|
assertEquals(2, read());
|