110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
/*
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* Copyright (C) 2011-2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/Assertions.h>
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#include <wtf/MetaAllocatorPtr.h>
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#include <wtf/RedBlackTree.h>
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#include <wtf/ThreadSafeRefCounted.h>
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namespace WTF {
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class MetaAllocator;
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class PrintStream;
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DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(MetaAllocatorHandle);
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class MetaAllocatorHandle : public ThreadSafeRefCounted<MetaAllocatorHandle>, public RedBlackTree<MetaAllocatorHandle, void*>::Node {
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WTF_MAKE_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(MetaAllocatorHandle);
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public:
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using MemoryPtr = MetaAllocatorPtr<HandleMemoryPtrTag>;
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WTF_EXPORT_PRIVATE ~MetaAllocatorHandle();
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MemoryPtr start() const
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{
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return m_start;
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}
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MemoryPtr end() const
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{
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return m_end;
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}
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uintptr_t startAsInteger() const
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{
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return m_start.untaggedPtr<uintptr_t>();
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}
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uintptr_t endAsInteger() const
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{
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return m_end.untaggedPtr<uintptr_t>();
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}
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size_t sizeInBytes() const
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{
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return m_end.untaggedPtr<size_t>() - m_start.untaggedPtr<size_t>();
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}
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bool containsIntegerAddress(uintptr_t address) const
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{
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return address >= startAsInteger() && address < endAsInteger();
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}
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bool contains(void* address) const
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{
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return containsIntegerAddress(reinterpret_cast<uintptr_t>(address));
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}
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WTF_EXPORT_PRIVATE void shrink(size_t newSizeInBytes);
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MetaAllocator& allocator()
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{
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return m_allocator;
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}
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void* key()
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{
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return m_start.untaggedPtr();
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}
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WTF_EXPORT_PRIVATE void dump(PrintStream& out) const;
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private:
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MetaAllocatorHandle(MetaAllocator&, MemoryPtr start, size_t sizeInBytes);
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MetaAllocator& m_allocator;
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MemoryPtr m_start;
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MemoryPtr m_end;
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friend class MetaAllocator;
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};
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}
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