mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
127 lines
3.6 KiB
C++
127 lines
3.6 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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#include <libyul/optimiser/VarDeclPropagator.h>
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#include <libyul/AsmData.h>
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#include <libdevcore/CommonData.h>
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#include <boost/range/algorithm_ext/erase.hpp>
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#include <algorithm>
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#include <map>
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using namespace std;
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using namespace dev;
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using namespace yul;
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void VarDeclPropagator::operator()(Block& _block)
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{
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map<YulString, TypedName> outerEmptyVarDecls;
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map<YulString, TypedName> outerLazyInitializedVarDecls;
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swap(m_emptyVarDecls, outerEmptyVarDecls);
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swap(m_lazyInitializedVarDecls, outerLazyInitializedVarDecls);
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ASTModifier::operator()(_block);
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iterateReplacing(
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_block.statements,
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[this](Statement& _stmt) -> boost::optional<vector<Statement>>
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{
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if (_stmt.type() == typeid(VariableDeclaration))
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{
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VariableDeclaration& varDecl = boost::get<VariableDeclaration>(_stmt);
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boost::remove_erase_if(
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varDecl.variables,
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[&](TypedName const& _typedName) { return m_lazyInitializedVarDecls.count(_typedName.name); }
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);
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if (varDecl.variables.empty())
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return vector<Statement>{};
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else
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return {};
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}
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else if (_stmt.type() == typeid(Assignment))
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{
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Assignment& assignment = boost::get<Assignment>(_stmt);
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if (isFullyLazyInitialized(assignment.variableNames))
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return vector<Statement>{recreateVariableDeclaration(assignment)};
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else
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return {};
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}
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else
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return {};
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}
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);
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swap(m_emptyVarDecls, outerEmptyVarDecls);
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swap(m_lazyInitializedVarDecls, outerLazyInitializedVarDecls);
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}
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void VarDeclPropagator::operator()(VariableDeclaration& _varDecl)
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{
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if (_varDecl.value)
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visit(*_varDecl.value);
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else
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for (TypedName const& typedName: _varDecl.variables)
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m_emptyVarDecls[typedName.name] = typedName;
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}
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void VarDeclPropagator::operator()(Assignment& _assignment)
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{
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visit(*_assignment.value);
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if (allVarNamesUninitialized(_assignment.variableNames))
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for (Identifier const& ident: _assignment.variableNames)
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m_lazyInitializedVarDecls[ident.name] = m_emptyVarDecls[ident.name];
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for (Identifier& name: _assignment.variableNames)
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(*this)(name);
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}
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void VarDeclPropagator::operator()(Identifier& _ident)
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{
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m_emptyVarDecls.erase(_ident.name);
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}
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bool VarDeclPropagator::allVarNamesUninitialized(vector<Identifier> const& _variableNames) const
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{
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return all_of(
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begin(_variableNames),
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end(_variableNames),
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[&](Identifier const& _ident) -> bool { return m_emptyVarDecls.count(_ident.name); }
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);
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}
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bool VarDeclPropagator::isFullyLazyInitialized(vector<Identifier> const& _variableNames) const
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{
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return all_of(
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begin(_variableNames),
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end(_variableNames),
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[&](Identifier const& ident) -> bool { return m_lazyInitializedVarDecls.count(ident.name); }
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);
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}
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VariableDeclaration VarDeclPropagator::recreateVariableDeclaration(Assignment& _assignment)
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{
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TypedNameList variables;
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for (Identifier const& varName: _assignment.variableNames)
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{
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variables.emplace_back(move(m_lazyInitializedVarDecls.at(varName.name)));
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m_lazyInitializedVarDecls.erase(varName.name);
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}
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return VariableDeclaration{move(_assignment.location), move(variables), std::move(_assignment.value)};
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}
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