solidity/libsolidity/formal/SymbolicVariables.h

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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/formal/SolverInterface.h>
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#include <libsolidity/formal/SSAVariable.h>
#include <libsolidity/ast/Types.h>
#include <libsolidity/ast/TypeProvider.h>
#include <memory>
namespace dev
{
namespace solidity
{
namespace smt
{
class EncodingContext;
class Type;
/**
* This abstract class represents the symbolic version of a program variable.
*/
class SymbolicVariable
{
public:
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SymbolicVariable(
solidity::TypePointer _type,
solidity::TypePointer _originalType,
std::string _uniqueName,
EncodingContext& _context
);
SymbolicVariable(
SortPointer _sort,
std::string _uniqueName,
EncodingContext& _context
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);
virtual ~SymbolicVariable() = default;
virtual Expression currentValue(solidity::TypePointer const& _targetType = TypePointer{}) const;
std::string currentName() const;
virtual Expression valueAtIndex(int _index) const;
virtual std::string nameAtIndex(int _index) const;
virtual Expression resetIndex();
virtual Expression increaseIndex();
virtual Expression operator()(std::vector<Expression> /*_arguments*/) const
{
solAssert(false, "Function application to non-function.");
}
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unsigned index() const { return m_ssa->index(); }
unsigned& index() { return m_ssa->index(); }
SortPointer const& sort() const { return m_sort; }
solidity::TypePointer const& type() const { return m_type; }
solidity::TypePointer const& originalType() const { return m_originalType; }
protected:
std::string uniqueSymbol(unsigned _index) const;
/// SMT sort.
SortPointer m_sort;
/// Solidity type, used for size and range in number types.
solidity::TypePointer m_type;
/// Solidity original type, used for type conversion if necessary.
solidity::TypePointer m_originalType;
std::string m_uniqueName;
EncodingContext& m_context;
std::unique_ptr<SSAVariable> m_ssa;
};
/**
* Specialization of SymbolicVariable for Bool
*/
class SymbolicBoolVariable: public SymbolicVariable
{
public:
SymbolicBoolVariable(
solidity::TypePointer _type,
std::string _uniqueName,
EncodingContext& _context
);
};
/**
* Specialization of SymbolicVariable for Integers
*/
class SymbolicIntVariable: public SymbolicVariable
{
public:
SymbolicIntVariable(
solidity::TypePointer _type,
solidity::TypePointer _originalType,
std::string _uniqueName,
EncodingContext& _context
);
};
/**
* Specialization of SymbolicVariable for Address
*/
class SymbolicAddressVariable: public SymbolicIntVariable
{
public:
SymbolicAddressVariable(
std::string _uniqueName,
EncodingContext& _context
);
};
/**
* Specialization of SymbolicVariable for FixedBytes
*/
class SymbolicFixedBytesVariable: public SymbolicIntVariable
{
public:
SymbolicFixedBytesVariable(
solidity::TypePointer _originalType,
unsigned _numBytes,
std::string _uniqueName,
EncodingContext& _context
);
};
/**
* Specialization of SymbolicVariable for FunctionType.
* Besides containing a symbolic function declaration,
* it also has an integer used as abstraction.
* By default, the abstract representation is used when
* values are requested, and the function declaration is
* used when operator() is applied over arguments.
*/
class SymbolicFunctionVariable: public SymbolicVariable
{
public:
SymbolicFunctionVariable(
solidity::TypePointer _type,
std::string _uniqueName,
EncodingContext& _context
);
SymbolicFunctionVariable(
SortPointer _sort,
std::string _uniqueName,
EncodingContext& _context
);
Expression currentValue(solidity::TypePointer const& _targetType = TypePointer{}) const override;
// Explicit request the function declaration.
Expression currentFunctionValue() const;
Expression valueAtIndex(int _index) const override;
// Explicit request the function declaration.
Expression functionValueAtIndex(int _index) const;
Expression resetIndex() override;
Expression increaseIndex() override;
Expression operator()(std::vector<Expression> _arguments) const override;
private:
/// Creates a new function declaration.
void resetDeclaration();
/// Stores the current function declaration.
Expression m_declaration;
/// Abstract representation.
SymbolicIntVariable m_abstract{
TypeProvider::uint256(),
TypeProvider::uint256(),
m_uniqueName + "_abstract",
m_context
};
};
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/**
* Specialization of SymbolicVariable for Mapping
*/
class SymbolicMappingVariable: public SymbolicVariable
{
public:
SymbolicMappingVariable(
solidity::TypePointer _type,
std::string _uniqueName,
EncodingContext& _context
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);
};
/**
* Specialization of SymbolicVariable for Array
*/
class SymbolicArrayVariable: public SymbolicVariable
{
public:
SymbolicArrayVariable(
solidity::TypePointer _type,
solidity::TypePointer _originalTtype,
std::string _uniqueName,
EncodingContext& _context
);
Expression currentValue(solidity::TypePointer const& _targetType = TypePointer{}) const override;
};
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/**
* Specialization of SymbolicVariable for Enum
*/
class SymbolicEnumVariable: public SymbolicVariable
{
public:
SymbolicEnumVariable(
solidity::TypePointer _type,
std::string _uniqueName,
EncodingContext& _context
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);
};
/**
* Specialization of SymbolicVariable for Tuple
*/
class SymbolicTupleVariable: public SymbolicVariable
{
public:
SymbolicTupleVariable(
solidity::TypePointer _type,
std::string _uniqueName,
EncodingContext& _context
);
std::vector<std::shared_ptr<SymbolicVariable>> const& components()
{
return m_components;
}
private:
std::vector<std::shared_ptr<SymbolicVariable>> m_components;
};
}
}
}