author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 09:24:54 +0200 | |
changeset 9 | 96e5fb8b040d |
permissions | -rw-r--r-- |
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// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// |
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/** |
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@file |
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@internalComponent |
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*/ |
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#ifndef MSLABALLOC_H |
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#define MSLABALLOC_H |
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#include "mcleanup.h" |
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/** |
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Slab allocator. |
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*/ |
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class RSlabAllocatorBase |
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{ |
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public: |
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RSlabAllocatorBase(TBool aDelayedCleanup); |
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~RSlabAllocatorBase(); |
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/** |
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Construct a slab allocator. |
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@param aMaxSlabs Maximum number of slabs to use. (Number of bits in \a slabBits.) |
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@param aObjectSize Size of objects to allocate. |
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*/ |
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TInt Construct(TUint aMaxSlabs, TUint aObjectSize); |
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/** |
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Construct a slab allocator using fixed virtual memory. |
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@param aMaxSlabs Maximum number of slabs to use. (Number of bits in \a slabBits.) |
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@param aObjectSize Size of objects to allocate. |
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@param aBase Virtual address for start of memory where slabs will be allocated. |
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Zero indicates 'anywhere'. |
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*/ |
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TInt Construct(TUint aMaxSlabs, TUint aObjectSize, TLinAddr aBase); |
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/** |
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Set the memory object to be used for the slab allocator. |
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*/ |
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FORCE_INLINE void SetMemory(DMemoryObject* aMemory, TUint aReserveCount) |
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{ |
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__NK_ASSERT_DEBUG(!iMemory); |
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iMemory = aMemory; |
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iReserveCount = aReserveCount; |
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} |
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/** |
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Allocate an object. |
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@return Allocated object, or the null pointer if there is insufficient memory to perform the allocation. |
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@pre MmuLock held |
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@post MmuLock held, but has always beet flashed |
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*/ |
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TAny* Alloc(); |
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/** |
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Free an object previously allocated with #Alloc. |
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@param aObject The object. |
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@pre MmuLock held |
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@post MmuLock held, but has always beet flashed |
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*/ |
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void Free(TAny* aObject); |
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protected: |
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class TSlabHeader : public SDblQueLink |
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{ |
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public: |
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SDblQue iFreeList; ///< List of unallocated objects in list. |
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TUint iAllocCount; ///< Number of objects allocated in this slab. |
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TAny* iHighWaterMark; ///< End of initialise region in slab. |
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}; |
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private: |
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TBool NewSlab(); |
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void InitSlab(TLinAddr aPage); |
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void FreeSlab(TSlabHeader* aSlab); |
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static void CleanupTrampoline(TAny* aSelf); |
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void Cleanup(); |
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#ifdef _DEBUG |
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void CheckSlab(TSlabHeader* aSlab); |
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#endif |
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private: |
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SDblQue iFreeList; ///< List of slabs which have unallocated objects in them. |
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TUint iFreeCount; ///< Number of unallocated objects. |
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TUint iReserveCount; ///< Number of unallocated objects to keep in reserve (to allow for recursion during allocation). |
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TUint iObjectsPerSlab; ///< Number of objects in each slab. |
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TUint iObjectSize; ///< Size, in bytes, of objects to be allocated. |
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TSpinLock iSpinLock; ///< Spinlock which protects iFreeList, iFreeCount and TSlabHeader contents. |
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|
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TMemoryCleanup iCleanup; ///< Used to queue Cleanup() if iDelayedCleanup is true. |
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TBool iDelayedCleanup; ///< True, if Free() should not free empty slabs. |
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|
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TBool iAllocatingSlab; ///< True if a new slab page is being allocated. |
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TBitMapAllocator* iSlabMap; ///< Bitmap of allocated slabs. |
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DMemoryObject* iMemory; ///< The memory object used to store slabs. |
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DMemoryMapping* iMapping; ///< The memory mapping used for slabs. |
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TLinAddr iBase; ///< Address of first slab. |
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}; |
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/** |
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Template for a slab allocator which can allocate up to N objects of type T. |
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*/ |
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template <class T, TUint N> |
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class RSlabAllocator : public RSlabAllocatorBase |
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{ |
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public: |
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enum |
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{ |
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EObjectSize = sizeof(T)>sizeof(SDblQueLink) ? sizeof(T) : sizeof(SDblQueLink), |
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EObjectsPerSlab = (KPageSize-sizeof(TSlabHeader))/EObjectSize, |
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EMaxSlabs = (N+EObjectsPerSlab-1)/EObjectsPerSlab |
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}; |
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|
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FORCE_INLINE RSlabAllocator() |
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: RSlabAllocatorBase(EFalse) |
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{ |
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__ASSERT_COMPILE(EObjectsPerSlab>0); |
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} |
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|
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FORCE_INLINE TInt Construct() |
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{ |
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return RSlabAllocatorBase::Construct(EMaxSlabs,EObjectSize); |
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} |
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/** |
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Allocate an object. |
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@return Allocated object, or the null pointer if there is insufficient memory to perform the allocation. |
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*/ |
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FORCE_INLINE T* Alloc() |
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{ |
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return (T*)RSlabAllocatorBase::Alloc(); |
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} |
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|
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/** |
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Free an object previously allocated with #Alloc. |
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@param aObject Object. |
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*/ |
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FORCE_INLINE void Free(T* aObject) |
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{ |
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RSlabAllocatorBase::Free(aObject); |
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} |
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}; |
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|
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/** |
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Template for a slab allocator for allocating objects of type T, using the |
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virtual address region [B..E) |
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*/ |
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template <class T, TLinAddr B, TLinAddr E> |
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class RStaticSlabAllocator : public RSlabAllocatorBase |
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{ |
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public: |
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enum |
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{ |
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EObjectSize = sizeof(T)>sizeof(SDblQueLink) ? sizeof(T) : sizeof(SDblQueLink), |
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EObjectsPerSlab = (KPageSize-sizeof(TSlabHeader))/EObjectSize, |
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EMaxSlabs = (E-B)/KPageSize |
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}; |
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|
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FORCE_INLINE RStaticSlabAllocator() |
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: RSlabAllocatorBase(ETrue) |
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{ |
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__ASSERT_COMPILE(EObjectsPerSlab>0); |
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} |
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FORCE_INLINE TInt Construct() |
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{ |
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return RSlabAllocatorBase::Construct(EMaxSlabs,EObjectSize,B); |
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} |
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/** |
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Allocate an object. |
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|
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@return Allocated object, or the null pointer if there is insufficient memory to perform the allocation. |
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*/ |
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FORCE_INLINE T* Alloc() |
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{ |
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return (T*)RSlabAllocatorBase::Alloc(); |
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} |
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/** |
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Free an object previously allocated with #Alloc. |
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@param aObject Object. |
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*/ |
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FORCE_INLINE void Free(T* aObject) |
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{ |
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RSlabAllocatorBase::Free(aObject); |
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} |
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}; |
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#endif |
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