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/*
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 <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GPL-3.0
#pragma once
#include <libsolidity/analysis/ControlFlowGraph.h>
#include <liblangutil/ErrorReporter.h>
#include <set>
namespace solidity::frontend
{
class ControlFlowAnalyzer
{
public:
explicit ControlFlowAnalyzer(CFG const& _cfg, langutil::ErrorReporter& _errorReporter):
m_cfg(_cfg), m_errorReporter(_errorReporter) {}
bool run();
private:
void analyze(FunctionDefinition const& _function, ContractDefinition const* _contract, FunctionFlow const& _flow);
/// Checks for uninitialized variable accesses in the control flow between @param _entry and @param _exit.
/// @param _entry entry node
/// @param _exit exit node
/// @param _emptyBody whether the body of the function is empty (true) or not (false)
/// @param _contractName name of the most derived contract, should be empty
/// if the function is also defined in it
void checkUninitializedAccess(CFGNode const* _entry, CFGNode const* _exit, bool _emptyBody, std::optional<std::string> _contractName = {});
/// Checks for unreachable code, i.e. code ending in @param _exit, @param _revert or @param _transactionReturn
/// that can not be reached from @param _entry.
void checkUnreachable(CFGNode const* _entry, CFGNode const* _exit, CFGNode const* _revert, CFGNode const* _transactionReturn);
CFG const& m_cfg;
langutil::ErrorReporter& m_errorReporter;
std::set<langutil::SourceLocation> m_unreachableLocationsAlreadyWarnedFor;
std::set<VariableDeclaration const*> m_unassignedReturnVarsAlreadyWarnedFor;
};
}