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/*
* Copyright (C) 2017 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 "DisallowScope.h"
#include <wtf/ThreadSpecific.h>
namespace JSC {
class DisallowVMReentry : public DisallowScope<DisallowVMReentry> {
WTF_MAKE_NONCOPYABLE(DisallowVMReentry);
typedef DisallowScope<DisallowVMReentry> Base;
public:
#ifdef NDEBUG
ALWAYS_INLINE DisallowVMReentry(bool = false) { }
ALWAYS_INLINE static void initialize() { }
#else // not NDEBUG
DisallowVMReentry(bool enabled = true)
: Base(enabled)
{ }
static void initialize()
{
WTF::threadSpecificKeyCreate(&s_scopeReentryCount, 0);
}
private:
static uintptr_t scopeReentryCount()
{
return reinterpret_cast<uintptr_t>(WTF::threadSpecificGet(s_scopeReentryCount));
}
static void setScopeReentryCount(uintptr_t value)
{
WTF::threadSpecificSet(s_scopeReentryCount, reinterpret_cast<void*>(value));
}
JS_EXPORT_PRIVATE static WTF::ThreadSpecificKey s_scopeReentryCount;
#endif // NDEBUG
friend class DisallowScope<DisallowVMReentry>;
};
} // namespace JSC
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