/* * 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 "Opcode.h" #include <wtf/Ref.h> namespace JSC { class MetadataTable; class UnlinkedMetadataTable { friend class LLIntOffsetsExtractor; friend class MetadataTable; public: struct LinkingData { UnlinkedMetadataTable* unlinkedMetadata; unsigned refCount; }; UnlinkedMetadataTable(); ~UnlinkedMetadataTable(); unsigned addEntry(OpcodeID); size_t sizeInBytes(); void finalize(); RefPtr<MetadataTable> link(); private: void unlink(MetadataTable&); size_t sizeInBytes(MetadataTable&); using Offset = unsigned; static constexpr unsigned s_offsetTableEntries = NUMBER_OF_BYTECODE_WITH_METADATA + 1; // one extra entry for the "end" offset; static constexpr unsigned s_offsetTableSize = s_offsetTableEntries * sizeof(UnlinkedMetadataTable::Offset); Offset* buffer() const { return bitwise_cast<Offset*>(bitwise_cast<uint8_t*>(m_rawBuffer) + sizeof(LinkingData)); } bool m_hasMetadata : 1; bool m_isFinalized : 1; bool m_isLinked : 1; void* m_rawBuffer; }; } // namespace JSC