112 lines
3.5 KiB
C++
112 lines
3.5 KiB
C++
/*
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* Copyright (C) 2017-2019 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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* 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
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* OF 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 "BAssert.h"
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#include "BMalloced.h"
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#include "IsoTLSLayout.h"
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#include <climits>
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namespace bmalloc {
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class IsoTLS;
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template<typename Entry>
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class IsoTLSEntryHolder {
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MAKE_BMALLOCED;
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IsoTLSEntryHolder(const IsoTLSEntryHolder&) = delete;
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IsoTLSEntryHolder& operator=(const IsoTLSEntryHolder&) = delete;
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public:
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template<typename... Args>
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IsoTLSEntryHolder(Args&&... args)
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: m_entry(std::forward<Args>(args)...)
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{
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IsoTLSLayout::get()->add(&m_entry);
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RELEASE_BASSERT(m_entry.offset() != UINT_MAX);
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}
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inline const Entry& operator*() const { m_entry; }
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inline Entry& operator*() { m_entry; }
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inline const Entry* operator->() const { return &m_entry; }
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inline Entry* operator->() { return &m_entry; }
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private:
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Entry m_entry;
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};
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class BEXPORT IsoTLSEntry {
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MAKE_BMALLOCED;
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IsoTLSEntry(const IsoTLSEntry&) = delete;
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IsoTLSEntry& operator=(const IsoTLSEntry&) = delete;
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public:
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virtual ~IsoTLSEntry();
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size_t offset() const { return m_offset; }
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size_t alignment() const { return sizeof(void*); }
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size_t size() const { return m_size; }
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size_t extent() const { return m_offset + m_size; }
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virtual void construct(void* entry) = 0;
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virtual void move(void* src, void* dst) = 0;
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virtual void destruct(void* entry) = 0;
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virtual void scavenge(void* entry) = 0;
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template<typename Func>
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void walkUpToInclusive(IsoTLSEntry*, const Func&);
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protected:
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IsoTLSEntry(size_t size);
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private:
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friend class IsoTLS;
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friend class IsoTLSLayout;
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IsoTLSEntry* m_next { nullptr };
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unsigned m_offset { UINT_MAX }; // Computed in constructor.
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unsigned m_size;
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};
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template<typename EntryType>
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class DefaultIsoTLSEntry : public IsoTLSEntry {
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public:
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~DefaultIsoTLSEntry() = default;
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protected:
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DefaultIsoTLSEntry();
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// This clones src onto dst and then destructs src. Therefore, entry destructors cannot do
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// scavenging.
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void move(void* src, void* dst) override;
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// Likewise, this is separate from scavenging. When the TLS is shutting down, we will be asked to
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// scavenge and then we will be asked to destruct.
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void destruct(void* entry) override;
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};
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} // namespace bmalloc
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