mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
118 lines
3.4 KiB
C++
118 lines
3.4 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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* Specific AST walkers that collect facts about identifiers and definitions.
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*/
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#pragma once
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#include <libyul/optimiser/ASTWalker.h>
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#include <map>
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#include <set>
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namespace solidity::yul
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{
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/**
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* Specific AST walker that collects all defined names.
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*/
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class NameCollector: public ASTWalker
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{
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public:
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explicit NameCollector(Block const& _block)
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{
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(*this)(_block);
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}
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using ASTWalker::operator ();
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void operator()(VariableDeclaration const& _varDecl) override;
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void operator()(FunctionDefinition const& _funDef) override;
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std::set<YulString> names() const { return m_names; }
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private:
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std::set<YulString> m_names;
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};
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/**
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* Specific AST walker that counts all references to all declarations.
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*/
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class ReferencesCounter: public ASTWalker
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{
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public:
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enum CountWhat { VariablesAndFunctions, OnlyVariables };
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explicit ReferencesCounter(CountWhat _countWhat = VariablesAndFunctions):
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m_countWhat(_countWhat)
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{}
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using ASTWalker::operator ();
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void operator()(Identifier const& _identifier) override;
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void operator()(FunctionCall const& _funCall) override;
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static std::map<YulString, size_t> countReferences(Block const& _block, CountWhat _countWhat = VariablesAndFunctions);
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static std::map<YulString, size_t> countReferences(FunctionDefinition const& _function, CountWhat _countWhat = VariablesAndFunctions);
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static std::map<YulString, size_t> countReferences(Expression const& _expression, CountWhat _countWhat = VariablesAndFunctions);
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std::map<YulString, size_t> const& references() const { return m_references; }
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private:
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CountWhat m_countWhat = CountWhat::VariablesAndFunctions;
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std::map<YulString, size_t> m_references;
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};
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/**
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* Specific AST walker that finds all variables that are assigned to.
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*/
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class Assignments: public ASTWalker
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{
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public:
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using ASTWalker::operator ();
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void operator()(Assignment const& _assignment) override;
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std::set<YulString> const& names() const { return m_names; }
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private:
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std::set<YulString> m_names;
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};
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/**
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* Collects all names from a given continue statement on onwards.
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*
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* It makes only sense to be invoked from within a body of an outer for loop, that is,
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* it will only collect all names from the beginning of the first continue statement
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* of the outer-most ForLoop.
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*/
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class AssignmentsSinceContinue: public ASTWalker
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{
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public:
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using ASTWalker::operator();
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void operator()(ForLoop const& _forLoop) override;
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void operator()(Continue const&) override;
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void operator()(Assignment const& _assignment) override;
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void operator()(FunctionDefinition const& _funDef) override;
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std::set<YulString> const& names() const { return m_names; }
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bool empty() const noexcept { return m_names.empty(); }
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private:
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size_t m_forLoopDepth = 0;
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bool m_continueFound = false;
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std::set<YulString> m_names;
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};
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}
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