/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
using namespace std;
using namespace dev;
using namespace dev::solidity;
bool PostTypeChecker::check(ASTNode const& _astRoot)
{
_astRoot.accept(*this);
return Error::containsOnlyWarnings(m_errorReporter.errors());
}
bool PostTypeChecker::visit(ContractDefinition const&)
{
solAssert(!m_currentConstVariable, "");
solAssert(m_constVariableDependencies.empty(), "");
return true;
}
void PostTypeChecker::endVisit(ContractDefinition const&)
{
solAssert(!m_currentConstVariable, "");
for (auto declaration: m_constVariables)
if (auto identifier = findCycle(declaration))
m_errorReporter.typeError(
declaration->location(),
"The value of the constant " + declaration->name() +
" has a cyclic dependency via " + identifier->name() + "."
);
m_constVariables.clear();
m_constVariableDependencies.clear();
}
bool PostTypeChecker::visit(VariableDeclaration const& _variable)
{
solAssert(!m_currentConstVariable, "");
if (_variable.isConstant())
{
m_currentConstVariable = &_variable;
m_constVariables.push_back(&_variable);
}
return true;
}
void PostTypeChecker::endVisit(VariableDeclaration const& _variable)
{
if (_variable.isConstant())
{
solAssert(m_currentConstVariable == &_variable, "");
m_currentConstVariable = nullptr;
}
}
bool PostTypeChecker::visit(Identifier const& _identifier)
{
if (m_currentConstVariable)
if (auto var = dynamic_cast(_identifier.annotation().referencedDeclaration))
if (var->isConstant())
m_constVariableDependencies[m_currentConstVariable].insert(var);
return true;
}
VariableDeclaration const* PostTypeChecker::findCycle(
VariableDeclaration const* _startingFrom,
set const& _seen
)
{
if (_seen.count(_startingFrom))
return _startingFrom;
else if (m_constVariableDependencies.count(_startingFrom))
{
set seen(_seen);
seen.insert(_startingFrom);
for (auto v: m_constVariableDependencies[_startingFrom])
if (findCycle(v, seen))
return v;
}
return nullptr;
}