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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/>.
*/
/**
* Optimisation stage that replaces variables by their most recently assigned expressions.
*/
#pragma once
#include <libjulia/optimiser/ASTWalker.h>
#include <string>
#include <map>
#include <set>
namespace dev
{
namespace julia
{
/**
* Optimisation stage that replaces variables by their most recently assigned expressions.
*
* Prerequisite: Disambiguator
*/
class Rematerialiser: public ASTModifier
{
public:
using ASTModifier::operator();
virtual void operator()(Assignment& _assignment) override;
virtual void operator()(VariableDeclaration& _varDecl) override;
virtual void operator()(If& _if) override;
virtual void operator()(Switch& _switch) override;
virtual void operator()(FunctionDefinition&) override;
virtual void operator()(ForLoop&) override;
virtual void operator()(Block& _block) override;
protected:
using ASTModifier::visit;
virtual void visit(Expression& _e) override;
private:
void handleAssignment(std::set<std::string> const& _names, Expression* _value);
/// Returns true iff the variable is in scope.
bool inScope(std::string const& _variableName) const;
/// Substitutions to be performed, if possible.
std::map<std::string, Expression const*> m_substitutions;
/// m_references[a].contains(b) <=> the current expression assigned to a references b
std::map<std::string, std::set<std::string>> m_references;
/// m_referencedBy[b].contains(a) <=> the current expression assigned to a references b
std::map<std::string, std::set<std::string>> m_referencedBy;
/// List of scopes, where each scope is a set of variables and a bool that tells
/// whether it is a function body (true) or not.
std::vector<std::pair<std::set<std::string>, bool>> m_variableScopes;
};
}
}
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