Method getOptimizedItems

libevmasm/CommonSubexpressionEliminator.cpp:38–75

using namespace solidity::langutil;

std::vector<AssemblyItem> CommonSubexpressionEliminator::getOptimizedItems()
{
	optimizeBreakingItem();

	KnownState nextInitialState = m_state;
	if (m_breakingItem)
		nextInitialState.feedItem(*m_breakingItem);
	KnownState nextState = nextInitialState;

	ScopeGuard reset([&]()
	{
		m_breakingItem = nullptr;
		m_storeOperations.clear();
		m_initialState = std::move(nextInitialState);
		m_state = std::move(nextState);
	});

	std::map<int, Id> initialStackContents;
	std::map<int, Id> targetStackContents;
	int minHeight = m_state.stackHeight() + 1;
	if (!m_state.stackElements().empty())
		minHeight = std::min(minHeight, m_state.stackElements().begin()->first);
	for (int height = minHeight; height <= m_initialState.stackHeight(); ++height)
		initialStackContents[height] = m_initialState.stackElement(height, langutil::DebugData::create());
	for (int height = minHeight; height <= m_state.stackHeight(); ++height)
		targetStackContents[height] = m_state.stackElement(height, langutil::DebugData::create());

	AssemblyItems items = CSECodeGenerator(m_state.expressionClasses(), m_storeOperations, m_evmVersion).generateCode(
		m_initialState.sequenceNumber(),
		m_initialState.stackHeight(),
		initialStackContents,
		targetStackContents
	);
	if (m_breakingItem)
		items.push_back(*m_breakingItem);

	return items;
}

void CommonSubexpressionEliminator::feedItem(AssemblyItem const& _item, bool _copyItem)
{