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/*
* Copyright (C) 2013, 2015 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. AND ITS CONTRIBUTORS ``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 ITS 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 "InstructionStream.h"
#include <limits.h>
#include <wtf/FastBitVector.h>
#include <wtf/Vector.h>
namespace JSC {
class CodeBlock;
class UnlinkedCodeBlock;
struct Instruction;
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(BytecodeBasicBlock);
class BytecodeBasicBlock {
WTF_MAKE_STRUCT_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(BytecodeBasicBlock);
public:
enum SpecialBlockType { EntryBlock, ExitBlock };
BytecodeBasicBlock(const InstructionStream::Ref&);
BytecodeBasicBlock(SpecialBlockType);
void shrinkToFit();
bool isEntryBlock() { return !m_leaderOffset && !m_totalLength; }
bool isExitBlock() { return m_leaderOffset == UINT_MAX && m_totalLength == UINT_MAX; }
unsigned leaderOffset() const { return m_leaderOffset; }
unsigned totalLength() const { return m_totalLength; }
const Vector<InstructionStream::Offset>& offsets() const { return m_offsets; }
const Vector<BytecodeBasicBlock*>& successors() const { return m_successors; }
FastBitVector& in() { return m_in; }
FastBitVector& out() { return m_out; }
unsigned index() const { return m_index; }
static void compute(CodeBlock*, const InstructionStream& instructions, Vector<std::unique_ptr<BytecodeBasicBlock>>&);
static void compute(UnlinkedCodeBlock*, const InstructionStream& instructions, Vector<std::unique_ptr<BytecodeBasicBlock>>&);
private:
template<typename Block> static void computeImpl(Block* codeBlock, const InstructionStream& instructions, Vector<std::unique_ptr<BytecodeBasicBlock>>& basicBlocks);
void addSuccessor(BytecodeBasicBlock* block) { m_successors.append(block); }
void addLength(unsigned);
InstructionStream::Offset m_leaderOffset;
unsigned m_totalLength;
unsigned m_index;
Vector<InstructionStream::Offset> m_offsets;
Vector<BytecodeBasicBlock*> m_successors;
FastBitVector m_in;
FastBitVector m_out;
};
inline BytecodeBasicBlock::BytecodeBasicBlock(const InstructionStream::Ref& instruction)
: m_leaderOffset(instruction.offset())
, m_totalLength(instruction->size())
{
m_offsets.append(m_leaderOffset);
}
inline BytecodeBasicBlock::BytecodeBasicBlock(BytecodeBasicBlock::SpecialBlockType blockType)
: m_leaderOffset(blockType == BytecodeBasicBlock::EntryBlock ? 0 : UINT_MAX)
, m_totalLength(blockType == BytecodeBasicBlock::EntryBlock ? 0 : UINT_MAX)
{
}
inline void BytecodeBasicBlock::addLength(unsigned bytecodeLength)
{
m_offsets.append(m_leaderOffset + m_totalLength);
m_totalLength += bytecodeLength;
}
} // namespace JSC