solidity/libyul/optimiser/VarDeclInitializer.cpp

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2018-12-13 14:26:01 +00:00
/*
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 <libdevcore/CommonData.h>
#include <libdevcore/Visitor.h>
using namespace std;
using namespace dev;
using namespace yul;
void VarDeclInitializer::operator()(Block& _block)
{
ASTModifier::operator()(_block);
static Expression const zero{Literal{{}, LiteralKind::Number, YulString{"0"}, {}}};
using OptionalStatements = boost::optional<vector<Statement>>;
GenericFallbackReturnsVisitor<OptionalStatements, VariableDeclaration> visitor{
[](VariableDeclaration& _varDecl) -> OptionalStatements
{
if (_varDecl.value)
return {};
else if (_varDecl.variables.size() == 1)
{
_varDecl.value = make_unique<Expression>(zero);
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return {};
}
else
{
OptionalStatements ret{vector<Statement>{}};
langutil::SourceLocation loc{std::move(_varDecl.location)};
for (auto& var: _varDecl.variables)
ret->push_back(VariableDeclaration{loc, {std::move(var)}, make_unique<Expression>(zero)});
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return ret;
}
}
};
iterateReplacing(_block.statements, boost::apply_visitor(visitor));
}