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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/>.
*/
#pragma once
#include <libsolidity/ast/ASTVisitor.h>
#include <z3++.h>
#include <map>
#include <string>
namespace dev
{
namespace solidity
{
class ErrorReporter;
class SMTCheckerImpl: private ASTConstVisitor
{
public:
SMTCheckerImpl(ErrorReporter& _errorReporter);
void analyze(SourceUnit const& _sources);
private:
// TODO: Check that we do not have concurrent reads and writes to a variable,
// because the order of expression evaluation is undefined
// TODO: or just force a certain order, but people might have a different idea about that.
virtual void endVisit(VariableDeclaration const& _node) override;
virtual bool visit(FunctionDefinition const& _node) override;
virtual void endVisit(FunctionDefinition const& _node) override;
virtual void endVisit(VariableDeclarationStatement const& _node) override;
virtual void endVisit(ExpressionStatement const& _node) override;
virtual void endVisit(Assignment const& _node) override;
virtual void endVisit(TupleExpression const& _node) override;
virtual void endVisit(BinaryOperation const& _node) override;
virtual void endVisit(FunctionCall const& _node) override;
virtual void endVisit(Identifier const& _node) override;
virtual void endVisit(Literal const& _node) override;
void arithmeticOperation(BinaryOperation const& _op);
void compareOperation(BinaryOperation const& _op);
void booleanOperation(BinaryOperation const& _op);
void checkCondition(
z3::expr _condition,
SourceLocation const& _location,
std::string const& _description,
std::string const& _additionalValueName = "",
z3::expr* _additionalValue = nullptr
);
void createVariable(VariableDeclaration const& _varDecl, bool _setToZero);
std::string uniqueSymbol(Declaration const& _decl);
std::string uniqueSymbol(Expression const& _expr);
bool knownVariable(Declaration const& _decl);
z3::expr currentValue(Declaration const& _decl);
z3::expr newValue(Declaration const& _decl);
z3::expr minValue(IntegerType const& _t);
z3::expr maxValue(IntegerType const& _t);
/// Returns the z3 expression corresponding to the AST node. Creates a new expression
/// if it does not exist yet.
z3::expr expr(Expression const& _e);
/// Returns the z3 function declaration corresponding to the given variable.
/// The function takes one argument which is the "sequence number".
z3::func_decl var(Declaration const& _decl);
z3::context m_context;
z3::solver m_solver;
std::map<Declaration const*, int> m_currentSequenceCounter;
std::map<Expression const*, z3::expr> m_z3Expressions;
std::map<Declaration const*, z3::func_decl> m_z3Variables;
ErrorReporter& m_errorReporter;
FunctionDefinition const* m_currentFunction = nullptr;
};
}
}
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