mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
75 lines
2.1 KiB
C++
75 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 renames identifiers to free up certain names.
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*/
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#pragma once
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#include <libyul/optimiser/ASTWalker.h>
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#include <libyul/optimiser/NameDispenser.h>
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#include <set>
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#include <map>
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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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* Optimiser component that renames identifiers to free up certain names.
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*
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* Only replaces names that have been defined inside the code. If the code uses
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* names to be freed but does not define them, they remain unchanged.
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*
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* Prerequisites: Disambiguator
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*/
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class NameDisplacer: public ASTModifier
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{
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public:
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explicit NameDisplacer(
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NameDispenser& _dispenser,
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std::set<YulString> const& _namesToFree
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):
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m_nameDispenser(_dispenser),
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m_namesToFree(_namesToFree)
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{
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for (YulString n: _namesToFree)
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m_nameDispenser.markUsed(n);
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}
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using ASTModifier::operator();
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void operator()(Identifier& _identifier) override;
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void operator()(VariableDeclaration& _varDecl) override;
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void operator()(FunctionDefinition& _function) override;
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void operator()(FunctionCall& _funCall) override;
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void operator()(Block& _block) override;
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protected:
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/// Check if the newly introduced identifier @a _name has to be replaced.
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void checkAndReplaceNew(YulString& _name);
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/// Replace the identifier @a _name if it is in the translation map.
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void checkAndReplace(YulString& _name) const;
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NameDispenser& m_nameDispenser;
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std::set<YulString> const& m_namesToFree;
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std::map<YulString, YulString> m_translations;
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};
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}
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