mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/*
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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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* Counts the number of references to a variable.
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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/Scope.h>
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namespace solidity::yul
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{
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struct AsmAnalysisInfo;
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/**
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* Counts the number of references to a variable. This includes actual (read) references
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* but also assignments to the variable. It does not include the declaration itself or
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* function parameters, but it does include function return parameters.
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*
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* This component can handle multiple variables of the same name.
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*
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* Can only be applied to strict assembly.
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*/
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struct VariableReferenceCounter: public yul::ASTWalker
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{
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public:
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static std::map<Scope::Variable const*, unsigned> run(AsmAnalysisInfo const& _assemblyInfo, Block const& _block)
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{
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VariableReferenceCounter variableReferenceCounter(_assemblyInfo);
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variableReferenceCounter(_block);
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return std::move(variableReferenceCounter.m_variableReferences);
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}
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protected:
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void operator()(Block const& _block) override;
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void operator()(Identifier const& _identifier) override;
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void operator()(FunctionDefinition const&) override;
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void operator()(ForLoop const&) override;
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private:
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explicit VariableReferenceCounter(
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AsmAnalysisInfo const& _assemblyInfo
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): m_info(_assemblyInfo)
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{}
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void increaseRefIfFound(YulString _variableName);
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AsmAnalysisInfo const& m_info;
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Scope* m_scope = nullptr;
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std::map<Scope::Variable const*, unsigned> m_variableReferences;
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};
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}
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