mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
89 lines
2.2 KiB
C++
89 lines
2.2 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <libsolidity/formal/SymbolicVariable.h>
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#include <memory>
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namespace dev
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{
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namespace solidity
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{
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class Declaration;
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/**
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* This class represents the SSA representation of a program variable.
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*/
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class SSAVariable
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{
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public:
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/// @param _decl Used to determine the type and forwarded to the symbolic var.
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/// @param _interface Forwarded to the symbolic var such that it can give constraints to the solver.
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SSAVariable(
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Declaration const* _decl,
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smt::SolverInterface& _interface
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);
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void resetIndex();
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/// This function returns the current index of this SSA variable.
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int index() const;
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/// This function returns the next free index of this SSA variable.
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int next() const;
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int operator++()
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{
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return m_currentSequenceCounter = (*m_nextFreeSequenceCounter)++;
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}
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smt::Expression operator()() const
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{
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return valueAtSequence(index());
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}
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smt::Expression operator()(int _seq) const
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{
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return valueAtSequence(_seq);
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}
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/// These two functions forward the call to the symbolic var
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/// which generates the constraints according to the type.
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void setZeroValue();
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void setUnknownValue();
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/// So far Int is supported.
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static bool supportedType(Type const* _decl);
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private:
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smt::Expression valueAtSequence(int _seq) const
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{
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return (*m_symbolicVar)(_seq);
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}
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std::shared_ptr<SymbolicVariable> m_symbolicVar = nullptr;
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int m_currentSequenceCounter;
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/// The next free sequence counter is a shared pointer because we want
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/// the copy and the copied to share it.
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std::shared_ptr<int> m_nextFreeSequenceCounter;
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};
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}
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}
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