Ejemplo n.º 1
0
 void GlobalsCollector::visit(ast::SelectExp & e)
 {
     e.getSelect()->accept(*this);
     for (auto _e : e.getCases())
     {
         _e->accept(*this);
     }
     if (ast::Exp * def = e.getDefaultCase())
     {
         def->accept(*this);
     }
 }
Ejemplo n.º 2
0
void SLintVisitor::visit(const ast::SelectExp & e)
{
    auto range = preCheck(e);
    e.getSelect()->accept(*this);

    ast::exps_t cases = e.getCases();
    for (auto exp : cases)
    {
        exp->accept(*this);
    }

    if (e.getDefaultCase() != NULL)
    {
        e.getDefaultCase()->accept(*this);
    }

    postCheck(e, range);
}
Ejemplo n.º 3
0
    void AnalysisVisitor::visit(ast::SelectExp & e)
    {
	logger.log(L"SelectExp", e.getLocation());
        e.getSelect()->accept(cv);
	ast::Exp & select = *e.getSelect();
	bool found = false;
	if (cv.getResult() && select.isConstExp())
	{
	    ast::ConstExp & ce = static_cast<ast::ConstExp &>(select);
	    types::InternalType * pIT = ce.getConstant();
	    if (!pIT)
	    {
		select.accept(cv.getExec());
		pIT = ce.getConstant();
	    }
	    if (pIT)
	    {
		for (ast::exps_t::iterator i = std::next(e.getExps().begin()), end = e.hasDefault() ? std::prev(e.getExps().end()) : e.getExps().end(); i != end; ++i)
		{
		    ast::CaseExp & casee = *static_cast<ast::CaseExp *>(*i);
		    casee.getTest()->accept(cv);
		    ast::Exp & test = *casee.getTest();
		    if (cv.getResult() && test.isConstExp())
		    {
			ast::ConstExp & ce = static_cast<ast::ConstExp &>(test);
			types::InternalType * pIT2 = ce.getConstant();
			if (!pIT2)
			{
			    test.accept(cv.getExec());
			    pIT2 = ce.getConstant();
			}
			if (pIT2)
			{
			    types::InternalType * pIT3 = GenericComparisonEqual(pIT, pIT2);
			    if (pIT3 && pIT3->isTrue())
			    {
				// We found the good case
				e.replace(casee.getBody());
				*i = nullptr;
				casee.getBody()->accept(*this);
				found = true;
				break;
			    }
			}
		    }
		}
		if (!found && e.hasDefault())
		{
		    e.getDefaultCase()->accept(*this);
		    e.replace(e.getDefaultCase());
		    *std::prev(e.getExps().end()) = nullptr;
		    found = true;
		}
	    }
	}

	if (!found)
	{
	    dm.addBlock(Block::EXCLUSIVE, &e);
	    e.getSelect()->accept(*this);
	    ast::exps_t cases = e.getCases();
	    for (auto exp : cases)
	    {
		dm.addBlock(Block::NORMAL, exp);
		exp->accept(*this);
		dm.finalizeBlock();
	    }
	    
	    if (e.getDefaultCase())
	    {
		dm.addBlock(Block::NORMAL, e.getDefaultCase());
		e.getDefaultCase()->accept(*this);
		dm.finalizeBlock();
	    }
	    dm.finalizeBlock();
	}
    }
Ejemplo n.º 4
0
    void AnalysisVisitor::analyze(ast::SelectExp & e)
    {
	enum Kind { INT, STRING, DUNNO };
	std::vector<int64_t> ints;
	std::vector<std::wstring> strs;
	ast::exps_t cases = e.getCases();
	Kind kind = DUNNO;
	bool first = true;

	for (ast::exps_t::iterator i = cases.begin(), end = cases.end(); i != end; ++i)
	{
	    ast::CaseExp & casee = *static_cast<ast::CaseExp *>(*i);
	    ast::Exp & test = *casee.getTest();
	    if (test.isDoubleExp())
	    {
		ast::DoubleExp & de = static_cast<ast::DoubleExp &>(test);
		if (first)
		{
		    kind = INT;
		    first = false;
		}
		else if (kind != INT)
		{
		    kind = DUNNO;
		}

		int64_t ival;
		if (kind == INT && tools::asInteger<int64_t>(de.getValue(), ival))
		{
		    ints.push_back(ival);
		}
	    }
	    else if (test.isStringExp())
	    {
		ast::StringExp & se = static_cast<ast::StringExp &>(test);
		if (first)
		{
		    kind = STRING;
		    first = false;
		}
		else if (kind != STRING)
		{
		    kind = DUNNO;
		}

		if (kind == STRING)
		{
		    strs.push_back(se.getValue());
		}
	    }
	}

	if (kind == INT)
	{
	    const std::size_t size = ints.size();
	    // Firstly, we check if we have a linear progression
	    if (size > 2)
	    {
		int64_t min, max;
		if (ints[0] < ints[1])
		{
		    min = ints[0];
		    max = ints[1];
		}
		else
		{
		    min = ints[1];
		    max = ints[0];
		}
		for (std::size_t i = 2; i < size; ++i)
		{
		    const int64_t v = ints[i];
		    if (v > max)
		    {
			max = v;
		    }
		    else if (v < min)
		    {
			min = v;
		    }
		}
		
		const double diff = 1 - (double)size / (double)(max - min + 1);
		ast::exps_t * _cases = new ast::exps_t(cases);
		if (diff <= 0.25)
		{
		    // we use a jump table

		    ast::TableIntSelectExp * tise = nullptr;
		    if (e.hasDefault())
		    {
			tise = new ast::TableIntSelectExp(e.getLocation(), *e.getSelect(), *_cases, *e.getDefaultCase(), ints, min, max);
		    }
		    else
		    {
			tise = new ast::TableIntSelectExp(e.getLocation(), *e.getSelect(), *_cases, ints, min, max);
		    }
		    tise->setLocation(e.getLocation());
		    e.replace(tise);
		}
		else if (size >= 4)
		{
		    // we use a map

		    ast::MapIntSelectExp * mise = nullptr;
		    if (e.hasDefault())
		    {
			mise = new ast::MapIntSelectExp(e.getLocation(), *e.getSelect(), *_cases, *e.getDefaultCase(), ints);
		    }
		    else
		    {
			mise = new ast::MapIntSelectExp(e.getLocation(), *e.getSelect(), *_cases, ints);
		    }
		    mise->setLocation(e.getLocation());
		    e.replace(mise);
		}
		else
		{
		    // we use a basic select

		    ast::SmallIntSelectExp * sise = nullptr;
		    if (e.hasDefault())
		    {
			sise = new ast::SmallIntSelectExp(e.getLocation(), *e.getSelect(), *_cases, *e.getDefaultCase(), ints);
		    }
		    else
		    {
			sise = new ast::SmallIntSelectExp(e.getLocation(), *e.getSelect(), *_cases, ints);
		    }
		    sise->setLocation(e.getLocation());
		    e.replace(sise);
		}
	    }
	}
	else if (kind == STRING)
	{
	    ast::exps_t * _cases = new ast::exps_t(cases);
	    ast::StringSelectExp * sse = nullptr;
	    if (e.hasDefault())
	    {
		sse = new ast::StringSelectExp(e.getLocation(), *e.getSelect(), *_cases, *e.getDefaultCase(), strs);
	    }
	    else
	    {
		sse = new ast::StringSelectExp(e.getLocation(), *e.getSelect(), *_cases, strs);
	    }
	    sse->setLocation(e.getLocation());
	    e.replace(sse);
	}
    }