| /* |
| * Copyright (C) 2017-2020 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include <wtf/ForbidHeapAllocation.h> |
| #include <wtf/Noncopyable.h> |
| |
| namespace JSC { |
| |
| template<class T> |
| class DisallowScope { |
| WTF_MAKE_NONCOPYABLE(DisallowScope); |
| WTF_FORBID_HEAP_ALLOCATION; |
| public: |
| #if ASSERT_ENABLED |
| DisallowScope() |
| { |
| auto count = T::scopeReentryCount(); |
| T::setScopeReentryCount(++count); |
| } |
| |
| ~DisallowScope() |
| { |
| auto count = T::scopeReentryCount(); |
| ASSERT(count); |
| T::setScopeReentryCount(--count); |
| } |
| |
| static bool isInEffectOnCurrentThread() |
| { |
| return !!T::scopeReentryCount(); |
| } |
| |
| #else // not ASSERT_ENABLED |
| ALWAYS_INLINE DisallowScope() { } // We need this to placate Clang due to unused warnings. |
| ALWAYS_INLINE static bool isInEffectOnCurrentThread() { return false; } |
| #endif // ASSERT_ENABLED |
| }; |
| |
| } // namespace JSC |