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Diffstat (limited to 'src/3rdparty/webkit/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.cpp')
-rw-r--r-- | src/3rdparty/webkit/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.cpp | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.cpp b/src/3rdparty/webkit/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.cpp new file mode 100644 index 0000000000..cc8fd15a9e --- /dev/null +++ b/src/3rdparty/webkit/JavaScriptCore/wtf/symbian/BlockAllocatorSymbian.cpp @@ -0,0 +1,132 @@ +/* + * 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. + */ + +#include "config.h" + +#if PLATFORM(SYMBIAN) + +#include "BlockAllocatorSymbian.h" + + +namespace WTF { + +/** Efficiently allocates blocks of size blockSize with blockSize alignment. + * Primarly designed for JSC Collector's needs. + * Not thread-safe. + */ +AlignedBlockAllocator::AlignedBlockAllocator(TUint32 reservationSize, TUint32 blockSize ) + : m_reservation(reservationSize), + m_blockSize(blockSize) +{ + + // Get system's page size value. + SYMBIAN_PAGESIZE(m_pageSize); + + // We only accept multiples of system page size for both initial reservation and the alignment/block size + m_reservation = SYMBIAN_ROUNDUPTOMULTIPLE(m_reservation, m_pageSize); + __ASSERT_ALWAYS(SYMBIAN_ROUNDUPTOMULTIPLE(m_blockSize, m_pageSize), User::Panic(_L("AlignedBlockAllocator1"), KErrArgument)); + + // Calculate max. bit flags we need to carve a reservationSize range into blockSize-sized blocks + m_map.numBits = m_reservation / m_blockSize; + const TUint32 bitsPerWord = 8*sizeof(TUint32); + const TUint32 numWords = (m_map.numBits + bitsPerWord -1) / bitsPerWord; + + m_map.bits = new TUint32[numWords]; + __ASSERT_ALWAYS(m_map.bits, User::Panic(_L("AlignedBlockAllocator2"), KErrNoMemory)); + m_map.clearAll(); + + // Open a Symbian RChunk, and reserve requested virtual address range + // Any thread in this process can operate this rchunk due to EOwnerProcess access rights. + TInt ret = m_chunk.CreateDisconnectedLocal(0 , 0, (TInt)m_reservation , EOwnerProcess); + if (ret != KErrNone) + User::Panic(_L("AlignedBlockAllocator3"), ret); + + // This is the offset to m_chunk.Base() required to make it m_blockSize-aligned + m_offset = SYMBIAN_ROUNDUPTOMULTIPLE(TUint32(m_chunk.Base()), m_blockSize) - TUint(m_chunk.Base()); + +} + +void* AlignedBlockAllocator::alloc() +{ + + TInt freeRam = 0; + void* address = 0; + + // Look up first free slot in bit map + const TInt freeIdx = m_map.findFree(); + + // Pseudo OOM: We ate up the address space we reserved.. + // ..even though the device may have free RAM left + if (freeIdx < 0) + return 0; + + TInt ret = m_chunk.Commit(m_offset + (m_blockSize * freeIdx), m_blockSize); + if (ret != KErrNone) + return 0; // True OOM: Device didn't have physical RAM to spare + + // Updated bit to mark region as in use. + m_map.set(freeIdx); + + // Calculate address of committed region (block) + address = (void*)( (m_chunk.Base() + m_offset) + (TUint)(m_blockSize * freeIdx) ); + + return address; +} + +void AlignedBlockAllocator::free(void* block) +{ + // Calculate index of block to be freed + TInt idx = TUint(static_cast<TUint8*>(block) - m_chunk.Base() - m_offset) / m_blockSize; + + __ASSERT_DEBUG(idx >= 0 && idx < m_map.numBits, User::Panic(_L("AlignedBlockAllocator4"), KErrCorrupt)); // valid index check + __ASSERT_DEBUG(m_map.get(idx), User::Panic(_L("AlignedBlockAllocator5"), KErrCorrupt)); // in-use flag check + + // Return committed region to system RAM pool (the physical RAM becomes usable by others) + TInt ret = m_chunk.Decommit(m_offset + m_blockSize * idx, m_blockSize); + + // mark this available again + m_map.clear(idx); +} + +void AlignedBlockAllocator::destroy() +{ + // release everything! + m_chunk.Decommit(0, m_chunk.MaxSize()); + m_map.clearAll(); +} + +AlignedBlockAllocator::~AlignedBlockAllocator() +{ + destroy(); + m_chunk.Close(); + delete [] m_map.bits; +} + +} // end of namespace + +#endif // SYMBIAN |