/* * Copyright (C) 2018 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 <wtf/FastMalloc.h> #include <wtf/Lock.h> #include <wtf/Noncopyable.h> #include <wtf/Vector.h> namespace JSC { class BlockDirectory; // Each Heap has a ThreadLocalCacheLayout that helps us figure out how to allocate a ThreadLocalCache // for that Heap. class ThreadLocalCacheLayout { WTF_MAKE_NONCOPYABLE(ThreadLocalCacheLayout); WTF_MAKE_FAST_ALLOCATED; public: ThreadLocalCacheLayout(); ~ThreadLocalCacheLayout(); // BlockDirectory calls this during creation and this fills in BlockDirectory::offset. void allocateOffset(BlockDirectory*); struct Snapshot { size_t size; Vector<BlockDirectory*> directories; }; Snapshot snapshot(); BlockDirectory* directory(unsigned offset); private: Lock m_lock; size_t m_size { 0 }; Vector<BlockDirectory*> m_directories; }; } // namespace JSC