2869fdfb17
Don't deopt when a PropertyCell changes from readonly to writable. Turbofan doesn't depend on readonly-ness unless the property is also non-configurable, in which case such a change can't happen. Change-Id: I3d1078a8adf1ec1b16d973dd71c4295d71003a8d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2531791 Commit-Queue: Georg Neis <neis@chromium.org> Auto-Submit: Georg Neis <neis@chromium.org> Reviewed-by: Toon Verwaest <verwaest@chromium.org> Cr-Commit-Position: refs/heads/master@{#71184}
28 lines
604 B
JavaScript
28 lines
604 B
JavaScript
// Copyright 2020 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: --allow-natives-syntax --opt --no-always-opt
|
|
|
|
|
|
glo = 0;
|
|
|
|
function write_glo(x) { glo = x }
|
|
|
|
%PrepareFunctionForOptimization(write_glo);
|
|
write_glo({});
|
|
write_glo(1);
|
|
assertEquals(1, glo);
|
|
|
|
// At this point, glo has cell type Mutable.
|
|
|
|
%OptimizeFunctionOnNextCall(write_glo);
|
|
write_glo(0);
|
|
assertEquals(0, glo);
|
|
assertOptimized(write_glo);
|
|
|
|
Object.freeze(this);
|
|
assertUnoptimized(write_glo);
|
|
write_glo(1);
|
|
assertEquals(0, glo);
|