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Diffstat (limited to 'src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.h')
-rw-r--r-- | src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.h b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.h new file mode 100644 index 0000000..21422f6 --- /dev/null +++ b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.h @@ -0,0 +1,120 @@ +/* + * Copyright (C) 2010 Nokia Corporation 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 BlockAllocatorSymbian_h +#define BlockAllocatorSymbian_h + +#include <e32cmn.h> +#include <e32std.h> +#include <hal.h> + + +#define SYMBIAN_PAGESIZE(x) (HAL::Get(HALData::EMemoryPageSize, x)); +#define SYMBIAN_FREERAM(x) (HAL::Get(HALData::EMemoryRAMFree, x)); +#define SYMBIAN_ROUNDUPTOMULTIPLE(x, multipleof) ( (x + multipleof - 1) & ~(multipleof - 1) ) + +// Set sane defaults if -D<flagname=value> wasn't provided via compiler args +#ifndef JSCCOLLECTOR_VIRTUALMEM_RESERVATION +#if defined(__WINS__) + // Emulator has limited virtual address space + #define JSCCOLLECTOR_VIRTUALMEM_RESERVATION (4*1024*1024) +#else + // HW has plenty of virtual addresses + #define JSCCOLLECTOR_VIRTUALMEM_RESERVATION (128*1024*1024) +#endif +#endif + +namespace WTF { + +/** + * Allocates contiguous region of size blockSize with blockSize-aligned address. + * blockSize 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 blockSize Size of a single allocation. Returned address will also be blockSize-aligned. + */ +class AlignedBlockAllocator { + public: + AlignedBlockAllocator(TUint32 reservationSize, TUint32 blockSize); + ~AlignedBlockAllocator(); + void destroy(); + void* alloc(); + void free(void* data); + + private: + RChunk m_chunk; // Symbian chunk that lets us reserve/commit/decommit + TUint m_offset; // offset of first committed region from base + TInt m_pageSize; // cached value of system page size, typically 4K on Symbian + TUint32 m_reservation; + TUint32 m_blockSize; + + // Tracks comitted/decommitted state of a blockSize region + struct { + + TUint32 *bits; // array of bit flags + TUint32 numBits; // number of regions to keep track of + + bool get(TUint32 n) const + { + return !!(bits[n >> 5] & (1 << (n & 0x1F))); + } + + void set(TUint32 n) + { + bits[n >> 5] |= (1 << (n & 0x1F)); + } + + void clear(TUint32 n) + { + bits[n >> 5] &= ~(1 << (n & 0x1F)); + } + + void clearAll() + { + for (TUint32 i = 0; i < numBits; i++) + clear(i); + } + + TInt findFree() const + { + for (TUint32 i = 0; i < numBits; i++) { + if (!get(i)) + return i; + } + return -1; + } + + } m_map; + +}; + +} + +#endif // end of BlockAllocatorSymbian_h + + |