+++ /dev/null
-/*
- * 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<SymbianChunk> 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<void*>(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<void*>( 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<char*>(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<char*>(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<char*>(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<char*>(address) - m_chunk->m_base, bytes);
- return (error == KErrNone);
-}
-
-bool PageAllocatorSymbian::contains(const void* address) const
-{
- return m_chunk->contains(address);
-}
-
-} // namespace WTF
projects / apple / javascriptcore.git / blobdiff