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/*
* Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies)
*
* 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 RegisterFileAllocatorSymbian_h
#define RegisterFileAllocatorSymbian_h
#include "SymbianDefines.h"
namespace WTF {
/**
* Allocates contiguous regions of size poolSize.
* poolSize must be a multiple of system page size (typically 4K on Symbian/ARM)
*
* @param reservationSize Virtual address range to be reserved upon creation of chunk (bytes).
* @param poolSize Size of a single allocation.
*/
class RegisterFileAllocator {
public:
RegisterFileAllocator(
TUint32 reservationSize, TUint32 poolSize = SYMBIAN_REGFILEALLOC_DEFAULTPOOLSIZE);
~RegisterFileAllocator();
void* buffer() const;
void grow(void* newEnd);
void shrink(void* newEnd);
private:
RChunk m_chunk; // Symbian chunk that lets us reserve/commit/decommit
// all following values are in numbers of bytes
TInt m_pageSize; // cached value of system page size, typically 4K on Symbian
TUint32 m_reserved; // total number of reserved bytes in virtual memory
TUint32 m_poolSize; // size of one memory pool, set by default to 64K in wtf/symbian/SymbianDefines.h
void* m_buffer; // pointer to base of the chunk
void* m_comEnd; // pointer to end of currently committed memory
void* m_resEnd; // pointer to end of reserved memory
};
} // end of namespace
#endif // RegisterFileAllocatorSymbian_h
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