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/*
* Copyright (C) 2013 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.
*/
#ifndef ConcurrentJITLock_h
#define ConcurrentJITLock_h
#include "DeferGC.h"
#include <wtf/Lock.h>
#include <wtf/NoLock.h>
namespace JSC {
#if ENABLE(CONCURRENT_JIT)
typedef Lock ConcurrentJITLock;
typedef LockHolder ConcurrentJITLockerImpl;
#else
typedef NoLock ConcurrentJITLock;
typedef NoLockLocker ConcurrentJITLockerImpl;
#endif
class ConcurrentJITLockerBase {
WTF_MAKE_NONCOPYABLE(ConcurrentJITLockerBase);
public:
explicit ConcurrentJITLockerBase(ConcurrentJITLock& lockable)
: m_locker(&lockable)
{
}
explicit ConcurrentJITLockerBase(ConcurrentJITLock* lockable)
: m_locker(lockable)
{
}
~ConcurrentJITLockerBase()
{
}
void unlockEarly()
{
m_locker.unlockEarly();
}
private:
ConcurrentJITLockerImpl m_locker;
};
class GCSafeConcurrentJITLocker : public ConcurrentJITLockerBase {
public:
GCSafeConcurrentJITLocker(ConcurrentJITLock& lockable, Heap& heap)
: ConcurrentJITLockerBase(lockable)
, m_deferGC(heap)
{
}
GCSafeConcurrentJITLocker(ConcurrentJITLock* lockable, Heap& heap)
: ConcurrentJITLockerBase(lockable)
, m_deferGC(heap)
{
}
~GCSafeConcurrentJITLocker()
{
// We have to unlock early due to the destruction order of base
// vs. derived classes. If we didn't, then we would destroy the
// DeferGC object before unlocking the lock which could cause a GC
// and resulting deadlock.
unlockEarly();
}
private:
#if ENABLE(CONCURRENT_JIT)
DeferGC m_deferGC;
#else
struct NoDefer {
NoDefer(Heap& heap) : m_heap(heap) { }
Heap& m_heap;
};
NoDefer m_deferGC;
#endif
};
class ConcurrentJITLocker : public ConcurrentJITLockerBase {
public:
ConcurrentJITLocker(ConcurrentJITLock& lockable)
: ConcurrentJITLockerBase(lockable)
{
}
ConcurrentJITLocker(ConcurrentJITLock* lockable)
: ConcurrentJITLockerBase(lockable)
{
}
#if ENABLE(CONCURRENT_JIT) && !defined(NDEBUG)
private:
DisallowGC m_disallowGC;
#endif
};
} // namespace JSC
#endif // ConcurrentJITLock_h
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