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/*
* Copyright (C) 2011-2021 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.
* 3. Neither the name of Apple 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.
*/
#pragma once
#include <wtf/Assertions.h>
#include <wtf/CodePtr.h>
#include <wtf/RedBlackTree.h>
#include <wtf/ThreadSafeRefCounted.h>
namespace WTF {
class MetaAllocator;
class PrintStream;
DECLARE_COMPACT_ALLOCATOR_WITH_HEAP_IDENTIFIER(MetaAllocatorHandle);
class MetaAllocatorHandle : public ThreadSafeRefCounted<MetaAllocatorHandle>, public RedBlackTree<MetaAllocatorHandle, void*>::Node {
WTF_MAKE_FAST_COMPACT_ALLOCATED_WITH_HEAP_IDENTIFIER(MetaAllocatorHandle);
public:
using MemoryPtr = CodePtr<HandleMemoryPtrTag>;
WTF_EXPORT_PRIVATE ~MetaAllocatorHandle();
MemoryPtr start() const
{
return m_start;
}
MemoryPtr end() const
{
return m_end;
}
uintptr_t startAsInteger() const
{
return m_start.untaggedPtr<uintptr_t>();
}
uintptr_t endAsInteger() const
{
return m_end.untaggedPtr<uintptr_t>();
}
size_t sizeInBytes() const
{
return m_end.untaggedPtr<size_t>() - m_start.untaggedPtr<size_t>();
}
bool containsIntegerAddress(uintptr_t address) const
{
return address >= startAsInteger() && address < endAsInteger();
}
bool contains(void* address) const
{
return containsIntegerAddress(reinterpret_cast<uintptr_t>(address));
}
WTF_EXPORT_PRIVATE void shrink(size_t newSizeInBytes);
MetaAllocator& allocator()
{
return m_allocator;
}
void* key()
{
return m_start.untaggedPtr();
}
WTF_EXPORT_PRIVATE void dump(PrintStream& out) const;
private:
MetaAllocatorHandle(MetaAllocator&, MemoryPtr start, size_t sizeInBytes);
MetaAllocator& m_allocator;
MemoryPtr m_start;
MemoryPtr m_end;
friend class MetaAllocator;
};
}
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