X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/1df5f87f1309a8daa30dabdee855f48ae40d14ab..6fe7ccc865dc7d7541b93c5bcaf6368d2c98a174:/wtf/OSAllocatorSymbian.cpp?ds=inline diff --git a/wtf/OSAllocatorSymbian.cpp b/wtf/OSAllocatorSymbian.cpp deleted file mode 100644 index 59bcdba..0000000 --- a/wtf/OSAllocatorSymbian.cpp +++ /dev/null @@ -1,202 +0,0 @@ -/* - * Copyright (C) 2010 Apple Inc. All rights reserved. - * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. - * - * 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. - * - * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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" -#include "OSAllocator.h" - -#include "PageAllocatorSymbian.h" - -namespace WTF { - -// Array to store code chunks used by JIT engine(s) -static RPointerArray codeChunksContainer; - -// The singleton data allocator (non code) -static PageAllocatorSymbian dataAllocator; - -_LIT(KErrorStringInternalConsistency, "OSAllocator:ConsistencyError"); -_LIT(KErrorStringChunkCreation, "OSAllocator:ChunkInitError"); -_LIT(KErrorStringPageSize, "OSAllocator:WrongPageSize"); - -// Makes a new code chunk for a JIT engine with everything in committed state -static void* allocateCodeChunk(size_t bytes) -{ - RChunk c; - TInt error = c.CreateLocalCode(bytes, bytes); - __ASSERT_ALWAYS(error == KErrNone, User::Panic(KErrorStringChunkCreation, error)); - - codeChunksContainer.Append(new SymbianChunk(c.Handle())); - return static_cast(c.Base()); -} - -// Frees the _entire_ code chunk in which this address resides. -static bool deallocateCodeChunk(void* address) -{ - bool found = false; - for (int i = 0; i < codeChunksContainer.Count(); i++) { - SymbianChunk* p = codeChunksContainer[i]; - if (p && p->contains(address)) { - codeChunksContainer.Remove(i); - delete p; - found = true; - } - } - return found; -} - -// Return the (singleton) object that manages all non-code VM operations -static PageAllocatorSymbian* dataAllocatorInstance() -{ - return &dataAllocator; -} - -// Reserve memory and return the base address of the region -void* OSAllocator::reserveUncommitted(size_t reservationSize, Usage usage, bool , bool executable, bool) -{ - void* base = 0; - if (executable) - base = allocateCodeChunk(reservationSize); - else - base = dataAllocatorInstance()->reserve(reservationSize); - return base; -} - -// Inverse operation of reserveUncommitted() -void OSAllocator::releaseDecommitted(void* parkedBase, size_t bytes) -{ - if (dataAllocatorInstance()->contains(parkedBase)) - dataAllocatorInstance()->release(parkedBase, bytes); - - // NOOP for code chunks (JIT) because we released them in decommit() -} - -// Commit what was previously reserved via reserveUncommitted() -void OSAllocator::commit(void* address, size_t bytes, bool, bool executable) -{ - // For code chunks, we commit (early) in reserveUncommitted(), so NOOP - // For data regions, do real work - if (!executable) - dataAllocatorInstance()->commit(address, bytes); -} - -void OSAllocator::decommit(void* address, size_t bytes) -{ - if (dataAllocatorInstance()->contains(address)) - dataAllocatorInstance()->decommit(address, bytes); - else - deallocateCodeChunk(address); // for code chunk, decommit AND release -} - -void* OSAllocator::reserveAndCommit(size_t bytes, Usage usage, bool writable, bool executable, bool) -{ - void* base = reserveUncommitted(bytes, usage, writable, executable); - commit(base, bytes, writable, executable); - return base; -} - - -// The PageAllocatorSymbian class helps map OSAllocator calls for reserve/commit/decommit -// to a single large Symbian chunk. Only works with multiples of page size, and as a corollary -// all addresses accepted or returned by it are also page-sized aligned. -// Design notes: -// - We initialize a chunk up-front with a large reservation size -// - The entire reservation reserve is logically divided into pageSized blocks (4K on Symbian) -// - The map maintains 1 bit for each of the 4K-sized region in our address space -// - OSAllocator::reserveUncommitted() requests lead to 1 or more bits being set in map -// to indicate internally reserved state. The VM address corresponding to the first bit is returned. -// - OSAllocator::commit() actually calls RChunk.commit() and commits *all or part* of the region -// reserved via reserveUncommitted() previously. -// - OSAllocator::decommit() calls RChunk.decommit() -// - OSAllocator::releaseDecommitted() unparks all the bits in the map, but trusts that a previously -// call to decommit() would have returned the memory to the OS -PageAllocatorSymbian::PageAllocatorSymbian() -{ - __ASSERT_ALWAYS(m_pageSize == WTF::pageSize(), User::Panic(KErrorStringPageSize, m_pageSize)); - - RChunk chunk; - TInt error = chunk.CreateDisconnectedLocal(0, 0, TInt(largeReservationSize)); - __ASSERT_ALWAYS(error == KErrNone, User::Panic(KErrorStringChunkCreation, error)); - - m_chunk = new SymbianChunk(chunk.Handle()); // takes ownership of chunk -} - -PageAllocatorSymbian::~PageAllocatorSymbian() -{ - delete m_chunk; -} - -// Reserves a region internally in the bitmap -void* PageAllocatorSymbian::reserve(size_t bytes) -{ - // Find first available region - const size_t nPages = bytes / m_pageSize; - const int64_t startIdx = m_map.findRunOfZeros(nPages); - - // Pseudo OOM - if (startIdx < 0) - return 0; - - for (size_t i = startIdx; i < startIdx + nPages ; i++) - m_map.set(i); - - return static_cast( m_chunk->m_base + (TUint)(m_pageSize * startIdx) ); -} - -// Reverses the effects of a reserve() call -void PageAllocatorSymbian::release(void* address, size_t bytes) -{ - const size_t startIdx = (static_cast(address) - m_chunk->m_base) / m_pageSize; - const size_t nPages = bytes / m_pageSize; - for (size_t i = startIdx; i < startIdx + nPages ; i++) - m_map.clear(i); -} - -// Actually commit memory from the OS, after a previous call to reserve() -bool PageAllocatorSymbian::commit(void* address, size_t bytes) -{ - // sanity check that bits were previously set - const size_t idx = (static_cast(address) - m_chunk->m_base) / m_pageSize; - const size_t nPages = bytes / m_pageSize; - __ASSERT_ALWAYS(m_map.get(idx), User::Panic(KErrorStringInternalConsistency, idx)); - __ASSERT_ALWAYS(m_map.get(idx+nPages-1), User::Panic(KErrorStringInternalConsistency, idx+nPages-1)); - - TInt error = m_chunk->Commit(static_cast(address) - m_chunk->m_base, bytes); - return (error == KErrNone); -} - -// Inverse operation of commit(), a release() should follow later -bool PageAllocatorSymbian::decommit(void* address, size_t bytes) -{ - TInt error = m_chunk->Decommit(static_cast(address) - m_chunk->m_base, bytes); - return (error == KErrNone); -} - -bool PageAllocatorSymbian::contains(const void* address) const -{ - return m_chunk->contains(address); -} - -} // namespace WTF