solidity/libyul/optimiser/VarDeclInitializer.cpp

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