mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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100 lines
3.6 KiB
C++
100 lines
3.6 KiB
C++
/*
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* Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "InstructionStream.h"
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#include "Opcode.h"
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#include <limits.h>
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#include <wtf/FastBitVector.h>
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#include <wtf/Vector.h>
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namespace JSC {
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class BytecodeGraph;
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class CodeBlock;
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class UnlinkedCodeBlock;
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class UnlinkedCodeBlockGenerator;
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struct Instruction;
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DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(BytecodeBasicBlock);
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class BytecodeBasicBlock {
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WTF_MAKE_FAST_ALLOCATED(BytecodeBasicBlock);
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WTF_MAKE_NONCOPYABLE(BytecodeBasicBlock);
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friend class BytecodeGraph;
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public:
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using BasicBlockVector = Vector<BytecodeBasicBlock, 0, UnsafeVectorOverflow, 16, BytecodeBasicBlockMalloc>;
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static_assert(maxOpcodeLength <= UINT8_MAX);
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enum SpecialBlockType { EntryBlock, ExitBlock };
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inline BytecodeBasicBlock(const InstructionStream::Ref&, unsigned blockIndex);
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inline BytecodeBasicBlock(SpecialBlockType, unsigned blockIndex);
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BytecodeBasicBlock(BytecodeBasicBlock&&) = default;
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bool isEntryBlock() { return !m_leaderOffset && !m_totalLength; }
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bool isExitBlock() { return m_leaderOffset == UINT_MAX && m_totalLength == UINT_MAX; }
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unsigned leaderOffset() const { return m_leaderOffset; }
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unsigned totalLength() const { return m_totalLength; }
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const Vector<uint8_t>& delta() const { return m_delta; }
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const Vector<unsigned>& successors() const { return m_successors; }
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FastBitVector& in() { return m_in; }
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FastBitVector& out() { return m_out; }
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unsigned index() const { return m_index; }
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explicit operator bool() const { return true; }
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private:
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// Only called from BytecodeGraph.
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static BasicBlockVector compute(CodeBlock*, const InstructionStream& instructions);
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static BasicBlockVector compute(UnlinkedCodeBlockGenerator*, const InstructionStream& instructions);
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template<typename Block> static BasicBlockVector computeImpl(Block* codeBlock, const InstructionStream& instructions);
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void shrinkToFit();
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void addSuccessor(BytecodeBasicBlock& block)
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{
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if (!m_successors.contains(block.index()))
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m_successors.append(block.index());
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}
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inline void addLength(unsigned);
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InstructionStream::Offset m_leaderOffset;
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unsigned m_totalLength;
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unsigned m_index;
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Vector<uint8_t> m_delta;
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Vector<unsigned> m_successors;
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FastBitVector m_in;
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FastBitVector m_out;
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};
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} // namespace JSC
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