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/*
* Copyright (C) 2013-2024 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 "Opcode.h"
#include <limits.h>
#include <wtf/FastBitVector.h>
#include <wtf/Vector.h>
namespace JSC {
class BytecodeGraph;
class CodeBlock;
class UnlinkedCodeBlock;
class UnlinkedCodeBlockGenerator;
template<typename> struct Instruction;
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(BytecodeBasicBlock);
template<typename OpcodeTraits>
class BytecodeBasicBlock {
WTF_MAKE_TZONE_ALLOCATED_TEMPLATE(BytecodeBasicBlock);
WTF_MAKE_NONCOPYABLE(BytecodeBasicBlock);
friend class BytecodeGraph;
public:
using BasicBlockVector = Vector<BytecodeBasicBlock, 0, UnsafeVectorOverflow, 16, BytecodeBasicBlockMalloc>;
using InstructionType = BaseInstruction<OpcodeTraits>;
using InstructionStreamType = InstructionStream<InstructionType>;
static_assert(maxBytecodeStructLength <= UINT8_MAX);
enum SpecialBlockType { EntryBlock, ExitBlock };
inline BytecodeBasicBlock(const typename InstructionStreamType::Ref&, unsigned blockIndex);
inline BytecodeBasicBlock(SpecialBlockType, unsigned blockIndex);
BytecodeBasicBlock(BytecodeBasicBlock<OpcodeTraits>&&) = default;
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<uint8_t>& delta() const { return m_delta; }
const Vector<unsigned>& successors() const { return m_successors; }
FastBitVector& in() { return m_in; }
FastBitVector& out() { return m_out; }
unsigned index() const { return m_index; }
explicit operator bool() const { return true; }
private:
// Only called from BytecodeGraph.
static BasicBlockVector compute(CodeBlock*, const InstructionStreamType& instructions);
static BasicBlockVector compute(UnlinkedCodeBlockGenerator*, const InstructionStreamType& instructions);
template<typename Block> static BasicBlockVector computeImpl(Block* codeBlock, const InstructionStreamType& instructions);
void shrinkToFit();
void addSuccessor(BytecodeBasicBlock<OpcodeTraits>& block)
{
if (!m_successors.contains(block.index()))
m_successors.append(block.index());
}
inline void addLength(unsigned);
typename InstructionStreamType::Offset m_leaderOffset;
unsigned m_totalLength;
unsigned m_index;
Vector<uint8_t> m_delta;
Vector<unsigned> m_successors;
FastBitVector m_in;
FastBitVector m_out;
};
WTF_MAKE_TZONE_ALLOCATED_TEMPLATE_IMPL(template<typename OpcodeTraits>, BytecodeBasicBlock<OpcodeTraits>);
using JSBytecodeBasicBlock = BytecodeBasicBlock<JSOpcodeTraits>;
using WasmBytecodeBasicBlock = BytecodeBasicBlock<WasmOpcodeTraits>;
} // namespace JSC
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