| /* |
| * Copyright (C) 2017-2019 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 "BAssert.h" |
| #include "BMalloced.h" |
| #include "IsoTLSLayout.h" |
| #include <climits> |
| |
| namespace bmalloc { |
| |
| class IsoTLS; |
| |
| template<typename Entry> |
| class IsoTLSEntryHolder { |
| MAKE_BMALLOCED; |
| IsoTLSEntryHolder(const IsoTLSEntryHolder&) = delete; |
| IsoTLSEntryHolder& operator=(const IsoTLSEntryHolder&) = delete; |
| public: |
| template<typename... Args> |
| IsoTLSEntryHolder(Args&&... args) |
| : m_entry(std::forward<Args>(args)...) |
| { |
| IsoTLSLayout::get()->add(&m_entry); |
| RELEASE_BASSERT(m_entry.offset() != UINT_MAX); |
| } |
| |
| inline const Entry& operator*() const { m_entry; } |
| inline Entry& operator*() { m_entry; } |
| inline const Entry* operator->() const { return &m_entry; } |
| inline Entry* operator->() { return &m_entry; } |
| |
| private: |
| Entry m_entry; |
| }; |
| |
| class BEXPORT IsoTLSEntry { |
| MAKE_BMALLOCED; |
| IsoTLSEntry(const IsoTLSEntry&) = delete; |
| IsoTLSEntry& operator=(const IsoTLSEntry&) = delete; |
| public: |
| virtual ~IsoTLSEntry(); |
| |
| size_t offset() const { return m_offset; } |
| size_t alignment() const { return sizeof(void*); } |
| 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&); |
| |
| protected: |
| IsoTLSEntry(size_t size); |
| |
| private: |
| friend class IsoTLS; |
| friend class IsoTLSLayout; |
| |
| IsoTLSEntry* m_next { nullptr }; |
| |
| unsigned m_offset { UINT_MAX }; // Computed in constructor. |
| unsigned m_size; |
| }; |
| |
| template<typename EntryType> |
| class DefaultIsoTLSEntry : public IsoTLSEntry { |
| public: |
| ~DefaultIsoTLSEntry() = default; |
| |
| protected: |
| DefaultIsoTLSEntry(); |
| |
| // 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; |
| }; |
| |
| } // namespace bmalloc |
| |