| /* |
| * Copyright (C) 2014-2019 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. |
| */ |
| |
| #pragma once |
| |
| #include "LineMetadata.h" |
| #include "Mutex.h" |
| #include "Sizes.h" |
| #include "StaticPerProcess.h" |
| #include "Vector.h" |
| #include <array> |
| #include <mutex> |
| |
| namespace bmalloc { |
| |
| class HeapConstants : public StaticPerProcess<HeapConstants> { |
| public: |
| HeapConstants(const LockHolder&); |
| ~HeapConstants() = delete; |
| |
| inline size_t pageClass(size_t sizeClass) const { return m_pageClasses[sizeClass]; } |
| inline size_t smallLineCount() const { return bmalloc::smallLineCount(m_vmPageSizePhysical); } |
| inline unsigned char startOffset(size_t sizeClass, size_t lineNumber) const { return lineMetadata(sizeClass, lineNumber).startOffset; } |
| inline unsigned char objectCount(size_t sizeClass, size_t lineNumber) const { return lineMetadata(sizeClass, lineNumber).objectCount; } |
| |
| private: |
| void initializeLineMetadata(); |
| void initializePageMetadata(); |
| |
| inline const LineMetadata& lineMetadata(size_t sizeClass, size_t lineNumber) const |
| { |
| return m_smallLineMetadata[sizeClass * smallLineCount() + lineNumber]; |
| } |
| |
| size_t m_vmPageSizePhysical; |
| const LineMetadata* m_smallLineMetadata { }; |
| Vector<LineMetadata> m_smallLineMetadataStorage; |
| std::array<size_t, sizeClassCount> m_pageClasses; |
| }; |
| DECLARE_STATIC_PER_PROCESS_STORAGE(HeapConstants); |
| |
| } // namespace bmalloc |