mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
71 lines
2.1 KiB
C++
71 lines
2.1 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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/**
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* Optimiser component that can create new unique names.
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*/
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#pragma once
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#include <libyul/ASTForward.h>
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#include <libyul/YulString.h>
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#include <set>
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namespace solidity::yul
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{
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struct Dialect;
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/**
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* Optimizer component that can be used to generate new names that
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* do not conflict with existing names.
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*
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* Tries to keep names short and appends decimals to disambiguate.
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*/
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class NameDispenser
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{
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public:
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/// Initialize the name dispenser with all the names used in the given AST.
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explicit NameDispenser(Dialect const& _dialect, Block const& _ast, std::set<YulString> _reservedNames = {});
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/// Initialize the name dispenser with the given used names.
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explicit NameDispenser(Dialect const& _dialect, std::set<YulString> _usedNames);
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/// @returns a currently unused name that should be similar to _nameHint.
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YulString newName(YulString _nameHint);
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/// Mark @a _name as used, i.e. the dispenser's newName function will not
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/// return it.
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void markUsed(YulString _name) { m_usedNames.insert(_name); }
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std::set<YulString> const& usedNames() { return m_usedNames; }
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/// Returns true if `_name` is either used or is a restricted identifier.
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bool illegalName(YulString _name);
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/// Resets `m_usedNames` with *only* the names that are used in the AST. Also resets value of
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/// `m_counter` to zero.
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void reset(Block const& _ast);
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private:
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Dialect const& m_dialect;
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std::set<YulString> m_usedNames;
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std::set<YulString> m_reservedNames;
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size_t m_counter = 0;
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};
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}
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