solidity/libyul/optimiser/NameDispenser.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/>.
*/
// SPDX-License-Identifier: GPL-3.0
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/**
* Optimiser component that can create new unique names.
*/
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#include <libyul/optimiser/NameDispenser.h>
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#include <libyul/optimiser/NameCollector.h>
#include <libyul/AsmData.h>
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#include <libyul/Dialect.h>
#include <libsolutil/CommonData.h>
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using namespace std;
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using namespace solidity;
using namespace solidity::yul;
using namespace solidity::util;
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NameDispenser::NameDispenser(Dialect const& _dialect, Block const& _ast, set<YulString> _reservedNames):
NameDispenser(_dialect, NameCollector(_ast).names() + std::move(_reservedNames))
{
}
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NameDispenser::NameDispenser(Dialect const& _dialect, set<YulString> _usedNames):
m_dialect(_dialect),
m_usedNames(std::move(_usedNames))
{
}
YulString NameDispenser::newName(YulString _nameHint)
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{
YulString name = _nameHint;
while (illegalName(name))
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{
m_counter++;
name = YulString(_nameHint.str() + "_" + to_string(m_counter));
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}
m_usedNames.emplace(name);
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return name;
}
bool NameDispenser::illegalName(YulString _name)
{
if (_name.empty() || m_usedNames.count(_name) || m_dialect.builtin(_name))
return true;
return false;
}