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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/>.
*/
/**
* Generic AST walker.
*/
#pragma once
#include <libyul/ASTDataForward.h>
#include <libyul/Exceptions.h>
#include <boost/variant.hpp>
#include <boost/optional.hpp>
#include <vector>
#include <set>
#include <map>
namespace dev
{
namespace yul
{
/**
* Generic AST walker.
*/
class ASTWalker: public boost::static_visitor<>
{
public:
virtual ~ASTWalker() = default;
virtual void operator()(Literal const&) {}
virtual void operator()(Instruction const&) { assertThrow(false, OptimizerException, ""); }
virtual void operator()(Identifier const&) {}
virtual void operator()(FunctionalInstruction const& _instr);
virtual void operator()(FunctionCall const& _funCall);
virtual void operator()(ExpressionStatement const& _statement);
virtual void operator()(Label const&) { assertThrow(false, OptimizerException, ""); }
virtual void operator()(StackAssignment const&) { assertThrow(false, OptimizerException, ""); }
virtual void operator()(Assignment const& _assignment);
virtual void operator()(VariableDeclaration const& _varDecl);
virtual void operator()(If const& _if);
virtual void operator()(Switch const& _switch);
virtual void operator()(FunctionDefinition const&);
virtual void operator()(ForLoop const&);
virtual void operator()(Block const& _block);
virtual void visit(Statement const& _st)
{
boost::apply_visitor(*this, _st);
}
virtual void visit(Expression const& _e)
{
boost::apply_visitor(*this, _e);
}
protected:
template <class T>
void walkVector(T const& _statements)
{
for (auto const& statement: _statements)
visit(statement);
}
};
/**
* Generic AST modifier (i.e. non-const version of ASTWalker).
*/
class ASTModifier: public boost::static_visitor<>
{
public:
virtual ~ASTModifier() = default;
virtual void operator()(Literal&) {}
virtual void operator()(Instruction&) { assertThrow(false, OptimizerException, ""); }
virtual void operator()(Identifier&) {}
virtual void operator()(FunctionalInstruction& _instr);
virtual void operator()(FunctionCall& _funCall);
virtual void operator()(ExpressionStatement& _statement);
virtual void operator()(Label&) { assertThrow(false, OptimizerException, ""); }
virtual void operator()(StackAssignment&) { assertThrow(false, OptimizerException, ""); }
virtual void operator()(Assignment& _assignment);
virtual void operator()(VariableDeclaration& _varDecl);
virtual void operator()(If& _if);
virtual void operator()(Switch& _switch);
virtual void operator()(FunctionDefinition&);
virtual void operator()(ForLoop&);
virtual void operator()(Block& _block);
virtual void visit(Statement& _st)
{
boost::apply_visitor(*this, _st);
}
virtual void visit(Expression& _e)
{
boost::apply_visitor(*this, _e);
}
protected:
template <class T>
void walkVector(T&& _statements)
{
for (auto& st: _statements)
visit(st);
}
};
}
}
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