/* 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/>. */ #include <libyul/optimiser/VarDeclInitializer.h> #include <libyul/AsmData.h> #include <libsolutil/CommonData.h> #include <libsolutil/Visitor.h> #include <libyul/Dialect.h> using namespace std; using namespace solidity; using namespace solidity::yul; void VarDeclInitializer::operator()(Block& _block) { ASTModifier::operator()(_block); using OptionalStatements = std::optional<vector<Statement>>; util::GenericVisitor visitor{ util::VisitorFallback<OptionalStatements>{}, [this](VariableDeclaration& _varDecl) -> OptionalStatements { if (_varDecl.value) return {}; if (_varDecl.variables.size() == 1) { _varDecl.value = make_unique<Expression>(m_dialect.zeroLiteralForType(_varDecl.variables.front().type)); return {}; } else { OptionalStatements ret{vector<Statement>{}}; langutil::SourceLocation loc{std::move(_varDecl.location)}; for (auto& var: _varDecl.variables) { unique_ptr<Expression> expr = make_unique<Expression >(m_dialect.zeroLiteralForType(var.type)); ret->emplace_back(VariableDeclaration{loc, {std::move(var)}, std::move(expr)}); } return ret; } } }; util::iterateReplacing(_block.statements, [&](auto&& _statement) { return std::visit(visitor, _statement); }); }