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/*
* Copyright (C) 2009 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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 PtrAndFlags_h
#define PtrAndFlags_h
#include <wtf/Assertions.h>
namespace WTF {
template<class T, typename FlagEnum> class PtrAndFlagsBase {
public:
bool isFlagSet(FlagEnum flagNumber) const { ASSERT(flagNumber < 2); return m_ptrAndFlags & (1 << flagNumber); }
void setFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags |= (1 << flagNumber);}
void clearFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags &= ~(1 << flagNumber);}
T* get() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); }
void set(T* ptr)
{
ASSERT(!(reinterpret_cast<intptr_t>(ptr) & 3));
m_ptrAndFlags = reinterpret_cast<intptr_t>(ptr) | (m_ptrAndFlags & 3);
#ifndef NDEBUG
m_leaksPtr = ptr;
#endif
}
bool operator!() const { return !get(); }
T* operator->() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); }
protected:
intptr_t m_ptrAndFlags;
#ifndef NDEBUG
void* m_leaksPtr; // Only used to allow tools like leaks on OSX to detect that the memory is referenced.
#endif
};
template<class T, typename FlagEnum> class PtrAndFlags : public PtrAndFlagsBase<T, FlagEnum> {
public:
PtrAndFlags()
{
PtrAndFlagsBase<T, FlagEnum>::m_ptrAndFlags = 0;
}
PtrAndFlags(T* ptr)
{
PtrAndFlagsBase<T, FlagEnum>::m_ptrAndFlags = 0;
PtrAndFlagsBase<T, FlagEnum>::set(ptr);
}
};
} // namespace WTF
using WTF::PtrAndFlagsBase;
using WTF::PtrAndFlags;
#endif // PtrAndFlags_h
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