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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/>.
*/
/**
* @author Federico Bond <federicobond@gmail.com>
* @date 2016
* Static analyzer and checker.
*/
#pragma once
#include <libsolidity/analysis/TypeChecker.h>
#include <libsolidity/ast/Types.h>
#include <libsolidity/ast/ASTAnnotations.h>
#include <libsolidity/ast/ASTForward.h>
#include <libsolidity/ast/ASTVisitor.h>
namespace dev
{
namespace solidity
{
/**
* The module that performs static analysis on the AST.
* In this context, static analysis is anything that can produce warnings which can help
* programmers write cleaner code. For every warning generated eher, it has to be possible to write
* equivalent code that does generate the warning.
*/
class StaticAnalyzer: private ASTConstVisitor
{
public:
/// @param _errors the reference to the list of errors and warnings to add them found during static analysis.
explicit StaticAnalyzer(ErrorList& _errors): m_errors(_errors) {}
/// Performs static analysis on the given source unit and all of its sub-nodes.
/// @returns true iff all checks passed. Note even if all checks passed, errors() can still contain warnings
bool analyze(SourceUnit const& _sourceUnit);
private:
/// Adds a new warning to the list of errors.
void warning(SourceLocation const& _location, std::string const& _description);
virtual bool visit(ContractDefinition const& _contract) override;
virtual void endVisit(ContractDefinition const& _contract) override;
virtual bool visit(FunctionDefinition const& _function) override;
virtual void endVisit(FunctionDefinition const& _function) override;
virtual bool visit(ExpressionStatement const& _statement) override;
virtual bool visit(VariableDeclaration const& _variable) override;
virtual bool visit(Identifier const& _identifier) override;
virtual bool visit(Return const& _return) override;
virtual bool visit(MemberAccess const& _memberAccess) override;
ErrorList& m_errors;
/// Flag that indicates whether the current contract definition is a library.
bool m_library = false;
/// Flag that indicates whether a public function does not contain the "payable" modifier.
bool m_nonPayablePublic = false;
/// Number of uses of each (named) local variable in a function, counter is initialized with zero.
std::map<VariableDeclaration const*, int> m_localVarUseCount;
FunctionDefinition const* m_currentFunction = nullptr;
};
}
}
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