/* 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 . */ /** * Component that collects variables that are never assigned to and their * initial values. */ #pragma once #include #include #include namespace yul { /** * Class that walks the AST and stores the initial value of each variable * that is never assigned to. * * Default value is represented as nullptr. * * Prerequisite: Disambiguator */ class SSAValueTracker: public ASTWalker { public: using ASTWalker::operator(); void operator()(VariableDeclaration const& _varDecl) override; void operator()(Assignment const& _assignment) override; std::map const& values() const { return m_values; } Expression const* value(YulString _name) const { return m_values.at(_name); } private: void setValue(YulString _name, Expression const* _value); std::map m_values; }; }