/* * 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. */ #pragma once #include "BMalloced.h" namespace bmalloc { class IsoTLS; class IsoTLSLayout; class BEXPORT IsoTLSEntry { MAKE_BMALLOCED; public: IsoTLSEntry(size_t alignment, size_t size); virtual ~IsoTLSEntry(); size_t offset() const { return m_offset; } size_t alignment() const { return m_alignment; } size_t size() const { return m_size; } size_t extent() const { return m_offset + m_size; } virtual void construct(void* entry) = 0; virtual void move(void* src, void* dst) = 0; virtual void destruct(void* entry) = 0; virtual void scavenge(void* entry) = 0; template<typename Func> void walkUpToInclusive(IsoTLSEntry*, const Func&); private: friend class IsoTLS; friend class IsoTLSLayout; IsoTLSEntry* m_next { nullptr }; size_t m_offset; // Computed in constructor. size_t m_alignment; size_t m_size; }; template<typename EntryType> class DefaultIsoTLSEntry : public IsoTLSEntry { public: DefaultIsoTLSEntry(); ~DefaultIsoTLSEntry(); protected: // This clones src onto dst and then destructs src. Therefore, entry destructors cannot do // scavenging. void move(void* src, void* dst) override; // Likewise, this is separate from scavenging. When the TLS is shutting down, we will be asked to // scavenge and then we will be asked to destruct. void destruct(void* entry) override; void scavenge(void* entry) override; }; } // namespace bmalloc