solidity/libsolidity/formal/VariableUsage.h
2020-01-07 15:51:50 +01:00

60 lines
2.0 KiB
C++

/*
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 <vector>
#include <set>
namespace solidity::frontend::smt
{
/**
* This class computes information about which variables are modified in a certain subtree.
*/
class VariableUsage: private ASTConstVisitor
{
public:
/// @param _outerCallstack the current callstack in the callers context.
std::set<VariableDeclaration const*> touchedVariables(ASTNode const& _node, std::vector<CallableDeclaration const*> const& _outerCallstack);
/// Sets whether to inline function calls.
void setFunctionInlining(bool _inlineFunction) { m_inlineFunctionCalls = _inlineFunction; }
private:
void endVisit(Identifier const& _node) override;
void endVisit(IndexAccess const& _node) override;
void endVisit(FunctionCall const& _node) override;
bool visit(FunctionDefinition const& _node) override;
void endVisit(FunctionDefinition const& _node) override;
void endVisit(ModifierInvocation const& _node) override;
void endVisit(PlaceholderStatement const& _node) override;
/// Checks whether an identifier should be added to touchedVariables.
void checkIdentifier(Identifier const& _identifier);
std::set<VariableDeclaration const*> m_touchedVariables;
std::vector<CallableDeclaration const*> m_callStack;
CallableDeclaration const* m_lastCall = nullptr;
bool m_inlineFunctionCalls = false;
};
}