mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
64 lines
1.9 KiB
C++
64 lines
1.9 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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#pragma once
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#include <libyul/ASTDataForward.h>
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#include <libyul/optimiser/ASTWalker.h>
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#include <libyul/Exceptions.h>
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#include <libyul/AsmDataForward.h>
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#include <vector>
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#include <set>
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#include <map>
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namespace dev
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{
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namespace yul
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{
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/**
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* Rewrites Assignment statements into VariableDeclaration when the assignment's LHS
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* variables had no value yet.
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*
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* It recursively walks through the AST and moves each declaration of variables to
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* the first assignment within the same block (if possible)..
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*/
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class VarDeclPropagator: public ASTModifier
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{
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public:
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using ASTModifier::operator();
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void operator()(Block& _block) override;
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void operator()(VariableDeclaration& _varDecl) override;
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void operator()(Assignment& _assignment) override;
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void operator()(Identifier& _ident) override;
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private:
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bool allVarNamesUninitialized(std::vector<Identifier> const& _variableNames) const;
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bool isFullyLazyInitialized(std::vector<Identifier> const& _variableNames) const;
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VariableDeclaration recreateVariableDeclaration(Assignment& _assignment);
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private:
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/// Holds a list of variables from current Block that have no value assigned yet.
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std::map<YulString, TypedName> m_emptyVarDecls;
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/// Holds a list variables (and their TypedName) within the current block.
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std::map<YulString, TypedName> m_lazyInitializedVarDecls;
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};
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}
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}
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