solidity/libyul/optimiser/NameDisplacer.cpp

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2019-06-19 09:37:22 +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/>.
*/
/**
* Optimiser component that renames identifiers to free up certain names.
*/
#include <libyul/optimiser/NameDisplacer.h>
#include <libyul/AsmData.h>
using namespace std;
using namespace dev;
using namespace yul;
void NameDisplacer::operator()(Identifier& _identifier)
{
checkAndReplace(_identifier.name);
}
void NameDisplacer::operator()(VariableDeclaration& _varDecl)
{
for (TypedName& var: _varDecl.variables)
checkAndReplaceNew(var.name);
ASTModifier::operator()(_varDecl);
}
void NameDisplacer::operator()(FunctionDefinition& _function)
{
// Should have been done in the block already.
yulAssert(!m_namesToFree.count(_function.name), "");
for (auto& param: _function.parameters)
checkAndReplaceNew(param.name);
for (auto& retVar: _function.returnVariables)
checkAndReplaceNew(retVar.name);
ASTModifier::operator()(_function);
}
void NameDisplacer::operator()(FunctionCall& _funCall)
{
checkAndReplace(_funCall.functionName.name);
ASTModifier::operator()(_funCall);
}
void NameDisplacer::operator()(Block& _block)
{
// First replace all the names of function definitions
// because of scoping.
for (auto& st: _block.statements)
if (st.type() == typeid(FunctionDefinition))
checkAndReplaceNew(boost::get<FunctionDefinition>(st).name);
ASTModifier::operator()(_block);
}
void NameDisplacer::checkAndReplaceNew(YulString& _name)
{
yulAssert(!m_translations.count(_name), "");
if (m_namesToFree.count(_name))
_name = (m_translations[_name] = m_nameDispenser.newName(_name));
}
void NameDisplacer::checkAndReplace(YulString& _name) const
{
if (m_translations.count(_name))
_name = m_translations.at(_name);
}