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/*
* 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 "Instruction.h"
#include "Opcode.h"
#include "UnlinkedMetadataTable.h"
#include <wtf/RefCounted.h>
namespace JSC {
class CodeBlock;
// MetadataTable has a bit strange memory layout for LLInt optimization.
// [UnlinkedMetadataTable::LinkingData][MetadataTable]
// ^
// The pointer of MetadataTable points at this address.
class MetadataTable {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(MetadataTable);
friend class LLIntOffsetsExtractor;
friend class UnlinkedMetadataTable;
public:
~MetadataTable();
ALWAYS_INLINE Instruction::Metadata* get(OpcodeID opcodeID)
{
ASSERT(opcodeID < NUMBER_OF_BYTECODE_WITH_METADATA);
return reinterpret_cast<Instruction::Metadata*>(getImpl(opcodeID));
}
template<typename Op, typename Functor>
ALWAYS_INLINE void forEach(const Functor& func)
{
auto* metadata = bitwise_cast<typename Op::Metadata*>(get(Op::opcodeID));
auto* end = bitwise_cast<typename Op::Metadata*>(getImpl(Op::opcodeID + 1));
for (; metadata + 1 <= end; ++metadata)
func(*metadata);
}
size_t sizeInBytes();
void ref()
{
++linkingData().refCount;
}
void deref()
{
unsigned tempRefCount = linkingData().refCount - 1;
if (!tempRefCount) {
MetadataTable::destroy(this);
return;
}
linkingData().refCount = tempRefCount;
}
unsigned refCount() const
{
return linkingData().refCount;
}
unsigned hasOneRef() const
{
return refCount() == 1;
}
private:
MetadataTable(UnlinkedMetadataTable&);
UnlinkedMetadataTable::Offset16* offsetTable16() const { return bitwise_cast<UnlinkedMetadataTable::Offset16*>(this); }
UnlinkedMetadataTable::Offset32* offsetTable32() const { return bitwise_cast<UnlinkedMetadataTable::Offset32*>(bitwise_cast<uint8_t*>(this) + UnlinkedMetadataTable::s_offset16TableSize); }
size_t totalSize() const
{
return getOffset(UnlinkedMetadataTable::s_offsetTableEntries - 1);
}
UnlinkedMetadataTable::LinkingData& linkingData() const
{
return *bitwise_cast<UnlinkedMetadataTable::LinkingData*>((bitwise_cast<uint8_t*>(this) - sizeof(UnlinkedMetadataTable::LinkingData)));
}
void* buffer() { return this; }
bool is32Bit() const { return !offsetTable16()[0]; }
ALWAYS_INLINE unsigned getOffset(unsigned i) const
{
unsigned offset = offsetTable16()[i];
if (offset)
return offset;
return offsetTable32()[i];
}
ALWAYS_INLINE uint8_t* getImpl(unsigned i)
{
return bitwise_cast<uint8_t*>(this) + getOffset(i);
}
static void destroy(MetadataTable*);
};
} // namespace JSC
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