blob: e3772a4d4bc70a5786babc23ac6bce9079173fa7 [file] [log] [blame]
/*
* Copyright (C) 2017 Apple Inc. 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. ``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
* 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 "IsoAlignedMemoryAllocator.h"
#include "MarkedBlock.h"
namespace JSC {
IsoAlignedMemoryAllocator::IsoAlignedMemoryAllocator(CString name)
#if ENABLE(MALLOC_HEAP_BREAKDOWN)
: m_debugHeap(name.data())
#endif
{
UNUSED_PARAM(name);
}
IsoAlignedMemoryAllocator::~IsoAlignedMemoryAllocator()
{
#if !ENABLE(MALLOC_HEAP_BREAKDOWN)
for (unsigned i = 0; i < m_blocks.size(); ++i) {
void* block = m_blocks[i];
if (!m_committed[i])
WTF::fastCommitAlignedMemory(block, MarkedBlock::blockSize);
fastAlignedFree(block);
}
#endif
}
void* IsoAlignedMemoryAllocator::tryAllocateAlignedMemory(size_t alignment, size_t size)
{
// Since this is designed specially for IsoSubspace, we know that we will only be asked to
// allocate MarkedBlocks.
RELEASE_ASSERT(alignment == MarkedBlock::blockSize);
RELEASE_ASSERT(size == MarkedBlock::blockSize);
#if ENABLE(MALLOC_HEAP_BREAKDOWN)
return m_debugHeap.memalign(MarkedBlock::blockSize, MarkedBlock::blockSize, true);
#else
auto locker = holdLock(m_lock);
m_firstUncommitted = m_committed.findBit(m_firstUncommitted, false);
if (m_firstUncommitted < m_blocks.size()) {
m_committed[m_firstUncommitted] = true;
void* result = m_blocks[m_firstUncommitted];
WTF::fastCommitAlignedMemory(result, MarkedBlock::blockSize);
return result;
}
void* result = tryFastAlignedMalloc(MarkedBlock::blockSize, MarkedBlock::blockSize);
if (!result)
return nullptr;
unsigned index = m_blocks.size();
m_blocks.append(result);
m_blockIndices.add(result, index);
if (m_blocks.capacity() != m_committed.size())
m_committed.resize(m_blocks.capacity());
m_committed[index] = true;
return result;
#endif
}
void IsoAlignedMemoryAllocator::freeAlignedMemory(void* basePtr)
{
#if ENABLE(MALLOC_HEAP_BREAKDOWN)
m_debugHeap.free(basePtr);
#else
auto locker = holdLock(m_lock);
auto iter = m_blockIndices.find(basePtr);
RELEASE_ASSERT(iter != m_blockIndices.end());
unsigned index = iter->value;
m_committed[index] = false;
m_firstUncommitted = std::min(index, m_firstUncommitted);
WTF::fastDecommitAlignedMemory(basePtr, MarkedBlock::blockSize);
#endif
}
void IsoAlignedMemoryAllocator::dump(PrintStream& out) const
{
out.print("Iso(", RawPointer(this), ")");
}
void* IsoAlignedMemoryAllocator::tryAllocateMemory(size_t size)
{
#if ENABLE(MALLOC_HEAP_BREAKDOWN)
return m_debugHeap.malloc(size);
#else
return FastMalloc::tryMalloc(size);
#endif
}
void IsoAlignedMemoryAllocator::freeMemory(void* pointer)
{
#if ENABLE(MALLOC_HEAP_BREAKDOWN)
m_debugHeap.free(pointer);
#else
FastMalloc::free(pointer);
#endif
}
void* IsoAlignedMemoryAllocator::tryReallocateMemory(void*, size_t)
{
// In IsoSubspace-managed PreciseAllocation, we must not perform realloc.
RELEASE_ASSERT_NOT_REACHED();
}
} // namespace JSC