void UselessRetChecker::preCheckNode(const ast::Exp & e, SLintContext & context, SLintResult & result)
{
if (e.isFunctionDec())
{
const ast::exps_t & rets = static_cast<const ast::FunctionDec &>(e).getReturns().getVars();
useless.push(std::map<symbol::Symbol, Location>());
std::map<symbol::Symbol, Location> & map = useless.top();
for (const auto ret : rets)
{
const ast::SimpleVar & var = *static_cast<const ast::SimpleVar *>(ret);
map.emplace(var.getSymbol(), var.getLocation());
}
}
else if (e.isSimpleVar())
{
const ast::SimpleVar & var = static_cast<const ast::SimpleVar &>(e);
if (context.isFunOut(var.getSymbol()) && context.isAssignedVar(var))
{
useless.top().erase(var.getSymbol());
}
}
}
void VariablesChecker::preCheckNode(const ast::Exp & e, SLintContext & context, SLintResult & result)
{
if (e.isFunctionDec())
{
const ast::FunctionDec & fd = static_cast<const ast::FunctionDec &>(e);
if (!assigned.empty())
{
// we declare the function in the current scope
std::pair<Location, ast::AssignListExp *> p = { e.getLocation(), nullptr };
assigned.top().emplace(fd.getSymbol().getName(), p);
}
assigned.emplace(std::unordered_map<std::wstring, std::pair<Location, ast::AssignListExp *>>());
used.emplace(std::unordered_map<std::wstring, const ast::Exp *>());
// a function cans refer to itself
std::pair<Location, ast::AssignListExp *> p = { e.getLocation(), nullptr };
assigned.top().emplace(fd.getSymbol().getName(), p);
}
else
{
if (!used.empty())
{
if (e.isSimpleVar())
{
const ast::SimpleVar & var = static_cast<const ast::SimpleVar &>(e);
if (context.isAssignedVar(var))
{
// if we are not in the context on a nested assignment in a function call (foo(a,b=2))
if (!var.getParent()->getParent() || !var.getParent()->getParent()->isCallExp())
{
const std::wstring & name = var.getSymbol().getName();
auto i = used.top().find(name);
if (!context.topLoop() || (i == used.top().end()) || !isParentOf(context.topLoop(), i->second))
{
// the variable has never been used or the last time it wasn't in a loop
if (i != used.top().end())
{
used.top().erase(i);
}
if (var.getParent() == context.getLHSExp() && var.getParent()->isAssignListExp())
{
// we have something like [lhs, rhs] = argn(0)
// if rhs is used and lhs is not used then this not an "error":
// we are obliged to define lhs just to get rhs.
// So when rhs is used lhs is "used" too.
std::pair<Location, ast::AssignListExp *> p = { var.getLocation(), static_cast<ast::AssignListExp *>(var.getParent()) };
assigned.top().emplace(name, p);
}
else
{
std::pair<Location, ast::AssignListExp *> p = { var.getLocation(), nullptr };
assigned.top().emplace(name, p);
}
}
else /*if (context.topLoop() && i != used.top.end() && isParentOf(context.topLoop(), i->second))*/
{
// Just to remember...
// Here the variable has already been used in the current loop and we reassign it
// something like:
// while (...)
// ... use i
// ...
// i = ...
// end
// In general the loop will looping so the assignment is implicitly destroyed by the use in the next iteration
// so we don't add this assignment !
}
}
}
else if (!e.getParent()->isFieldExp() || static_cast<const ast::FieldExp *>(e.getParent())->getTail() != &e)
{
const symbol::Symbol & sym = var.getSymbol();
const std::wstring & name = sym.getName();
if (used.top().find(name) == used.top().end())
{
used.top().emplace(name, context.topLoop());
auto i = assigned.top().find(name);
if (i == assigned.top().end())
{
if (!context.isFunIn(name) && !SLintChecker::isScilabConstant(name))
{
types::InternalType * pIT = symbol::Context::getInstance()->get(sym);
if (pIT)
{
if (!pIT->isFunction() && !pIT->isMacroFile() && !pIT->isMacro())
{
result.report(context, e.getLocation(), *this, _("Use of non-initialized variable \'%s\' may have any side-effects."), name);
}
}
else if (!context.isPrivateFunction(sym))
{
/* The symbol doesn't correspond to a private function:
function tata()
titi()
end
function titi()
...
end
titi is private but usable in tata.
*/
std::wstring fname;
if (context.isExternPrivateFunction(sym, fname))
{
result.report(context, e.getLocation(), *this, _("Use of a private macro \'%s\' defined in an other file %s."), name, fname);
}
else if (!context.getPublicFunction(fname))
{
// The macro has not been declared somewhere in the project
result.report(context, e.getLocation(), *this, _("Use of non-initialized variable \'%s\' may have any side-effects."), name);
}
}
}
}
else
{
if (ast::AssignListExp * ale = i->second.second)
{
// the variable is in an AssignListExp
// so we must "use" the variables which preceed it too
for (auto e : ale->getExps())
{
if (e->isSimpleVar())
{
const std::wstring & prevName = static_cast<ast::SimpleVar *>(e)->getSymbol().getName();
assigned.top().erase(prevName);
if (prevName == name)
{
break;
}
else
{
used.top().emplace(prevName, context.topLoop());
}
}
}
}
else
{
assigned.top().erase(i);
}
}
}
}
}
// for i=1:10... end even if i is not used, i is useful to make the loop
/*else if (e.isVarDec())
{
const ast::VarDec & vd = static_cast<const ast::VarDec &>(e);
const std::wstring & name = vd.getSymbol().getName();
std::pair<Location, ast::AssignListExp *> p = { vd.getLocation(), nullptr };
assigned.top().emplace(name, p);
used.top().erase(name);
}*/
}
}
}