| /* |
| * Copyright (C) 2011 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 |
| |
| |