mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libsolidity/analysis/PostTypeChecker.h>
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#include <libsolidity/ast/AST.h>
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#include <libsolidity/analysis/SemVerHandler.h>
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#include <libsolidity/interface/Version.h>
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#include <boost/range/adaptor/map.hpp>
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#include <memory>
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using namespace std;
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using namespace dev;
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using namespace dev::solidity;
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bool PostTypeChecker::check(ASTNode const& _astRoot)
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{
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_astRoot.accept(*this);
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return Error::containsOnlyWarnings(m_errors);
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}
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void PostTypeChecker::typeError(SourceLocation const& _location, std::string const& _description)
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{
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auto err = make_shared<Error>(Error::Type::TypeError);
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*err <<
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errinfo_sourceLocation(_location) <<
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errinfo_comment(_description);
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m_errors.push_back(err);
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}
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bool PostTypeChecker::visit(ContractDefinition const&)
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{
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solAssert(!m_currentConstVariable, "");
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solAssert(m_constVariableDependencies.empty(), "");
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return true;
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}
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void PostTypeChecker::endVisit(ContractDefinition const&)
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{
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solAssert(!m_currentConstVariable, "");
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for (auto declaration: m_constVariables)
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if (auto identifier = findCycle(declaration))
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typeError(declaration->location(), "The value of the constant " + declaration->name() + " has a cyclic dependency via " + identifier->name() + ".");
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m_constVariables.clear();
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m_constVariableDependencies.clear();
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}
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bool PostTypeChecker::visit(VariableDeclaration const& _variable)
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{
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solAssert(!m_currentConstVariable, "");
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if (_variable.isConstant())
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{
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m_currentConstVariable = &_variable;
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m_constVariables.push_back(&_variable);
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}
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return true;
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}
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void PostTypeChecker::endVisit(VariableDeclaration const& _variable)
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{
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if (_variable.isConstant())
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{
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solAssert(m_currentConstVariable == &_variable, "");
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m_currentConstVariable = nullptr;
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}
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}
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bool PostTypeChecker::visit(Identifier const& _identifier)
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{
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if (m_currentConstVariable)
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if (auto var = dynamic_cast<VariableDeclaration const*>(_identifier.annotation().referencedDeclaration))
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if (var->isConstant())
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m_constVariableDependencies[m_currentConstVariable].insert(var);
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return true;
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}
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VariableDeclaration const* PostTypeChecker::findCycle(
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VariableDeclaration const* _startingFrom,
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set<VariableDeclaration const*> const& _seen
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)
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{
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if (_seen.count(_startingFrom))
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return _startingFrom;
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else if (m_constVariableDependencies.count(_startingFrom))
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{
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set<VariableDeclaration const*> seen(_seen);
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seen.insert(_startingFrom);
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for (auto v: m_constVariableDependencies[_startingFrom])
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if (findCycle(v, seen))
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return v;
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}
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return nullptr;
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}
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