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/*
* Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>
* Copyright (C) 2016-2023 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 "BytecodeBasicBlock.h"
#include "BytecodeDumper.h"
#include <wtf/IndexedContainerIterator.h>
#include <wtf/IteratorRange.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
class BytecodeGraph {
WTF_MAKE_NONCOPYABLE(BytecodeGraph);
WTF_MAKE_TZONE_ALLOCATED(BytecodeGraph);
public:
using BasicBlockType = JSBytecodeBasicBlock;
using BasicBlocksVector = typename BasicBlockType::BasicBlockVector;
using InstructionStreamType = typename BasicBlockType::InstructionStreamType;
typedef WTF::IndexedContainerIterator<BytecodeGraph> iterator;
template <typename CodeBlockType>
inline BytecodeGraph(CodeBlockType*, const InstructionStreamType&);
WTF::IteratorRange<BasicBlocksVector::reverse_iterator> basicBlocksInReverseOrder()
{
return WTF::makeIteratorRange(m_basicBlocks.rbegin(), m_basicBlocks.rend());
}
static bool blockContainsBytecodeOffset(const BasicBlockType& block, typename InstructionStreamType::Offset bytecodeOffset)
{
unsigned leaderOffset = block.leaderOffset();
return bytecodeOffset >= leaderOffset && bytecodeOffset < leaderOffset + block.totalLength();
}
BasicBlockType* findBasicBlockForBytecodeOffset(typename InstructionStreamType::Offset bytecodeOffset)
{
/*
for (unsigned i = 0; i < m_basicBlocks.size(); i++) {
if (blockContainsBytecodeOffset(m_basicBlocks[i], bytecodeOffset))
return &m_basicBlocks[i];
}
return 0;
*/
BasicBlockType* basicBlock = approximateBinarySearch<BasicBlockType, unsigned>(m_basicBlocks, m_basicBlocks.size(), bytecodeOffset, [] (BasicBlockType* basicBlock) { return basicBlock->leaderOffset(); });
// We found the block we were looking for.
if (blockContainsBytecodeOffset(*basicBlock, bytecodeOffset))
return basicBlock;
// Basic block is to the left of the returned block.
if (bytecodeOffset < basicBlock->leaderOffset()) {
ASSERT(basicBlock - 1 >= m_basicBlocks.data());
ASSERT(blockContainsBytecodeOffset(basicBlock[-1], bytecodeOffset));
return &basicBlock[-1];
}
// Basic block is to the right of the returned block.
ASSERT(&basicBlock[1] <= &m_basicBlocks.last());
ASSERT(blockContainsBytecodeOffset(basicBlock[1], bytecodeOffset));
return &basicBlock[1];
}
BasicBlockType* findBasicBlockWithLeaderOffset(typename InstructionStreamType::Offset leaderOffset)
{
return tryBinarySearch<BasicBlockType, unsigned>(m_basicBlocks, m_basicBlocks.size(), leaderOffset, [] (BasicBlockType* basicBlock) { return basicBlock->leaderOffset(); });
}
unsigned size() const { return m_basicBlocks.size(); }
BasicBlockType& at(unsigned index) const { return const_cast<BytecodeGraph*>(this)->m_basicBlocks[index]; }
BasicBlockType& operator[](unsigned index) const { return at(index); }
iterator begin() { return iterator(*this, 0); }
iterator end() { return iterator(*this, size()); }
BasicBlockType& first() { return at(0); }
BasicBlockType& last() { return at(size() - 1); }
template <typename CodeBlockType>
void dump(CodeBlockType* codeBlock, const InstructionStreamType& instructions, std::optional<Vector<Operands<SpeculatedType>>> speculationAtHead, PrintStream& printer = WTF::dataFile())
{
CodeBlockBytecodeDumper<CodeBlockType>::dumpGraph(codeBlock, instructions, *this, speculationAtHead, printer);
}
private:
BasicBlocksVector m_basicBlocks;
};
template<typename CodeBlockType>
BytecodeGraph::BytecodeGraph(CodeBlockType* codeBlock, const InstructionStreamType& instructions)
: m_basicBlocks(BasicBlockType::compute(codeBlock, instructions))
{
ASSERT(m_basicBlocks.size());
}
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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