mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
c2362c3362
Signed-off-by: Jun Zhang <jun@junz.org>
61 lines
1.9 KiB
C++
61 lines
1.9 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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// SPDX-License-Identifier: GPL-3.0
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#include <libyul/optimiser/VarDeclInitializer.h>
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#include <libyul/AST.h>
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#include <libsolutil/CommonData.h>
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#include <libsolutil/Visitor.h>
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#include <libyul/Dialect.h>
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using namespace solidity;
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using namespace solidity::yul;
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void VarDeclInitializer::operator()(Block& _block)
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{
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ASTModifier::operator()(_block);
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using OptionalStatements = std::optional<std::vector<Statement>>;
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util::GenericVisitor visitor{
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util::VisitorFallback<OptionalStatements>{},
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[this](VariableDeclaration& _varDecl) -> OptionalStatements
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{
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if (_varDecl.value)
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return {};
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if (_varDecl.variables.size() == 1)
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{
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_varDecl.value = std::make_unique<Expression>(m_dialect.zeroLiteralForType(_varDecl.variables.front().type));
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return {};
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}
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else
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{
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OptionalStatements ret{std::vector<Statement>{}};
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for (auto& var: _varDecl.variables)
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{
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std::unique_ptr<Expression> expr = std::make_unique<Expression >(m_dialect.zeroLiteralForType(var.type));
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ret->emplace_back(VariableDeclaration{std::move(_varDecl.debugData), {std::move(var)}, std::move(expr)});
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}
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return ret;
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}
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}
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};
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util::iterateReplacing(_block.statements, [&](auto&& _statement) { return std::visit(visitor, _statement); });
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}
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