mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
63 lines
2.1 KiB
C++
63 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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#include <libyul/optimiser/CircularReferencesPruner.h>
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#include <libyul/optimiser/CallGraphGenerator.h>
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#include <libyul/optimiser/OptimizerUtilities.h>
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#include <libyul/AsmData.h>
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#include <libsolutil/Algorithms.h>
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using namespace std;
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using namespace solidity::yul;
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void CircularReferencesPruner::run(OptimiserStepContext& _context, Block& _ast)
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{
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CircularReferencesPruner{_context.reservedIdentifiers}(_ast);
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}
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void CircularReferencesPruner::operator()(Block& _block)
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{
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set<YulString> functionsToKeep =
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functionsCalledFromOutermostContext(CallGraphGenerator::callGraph(_block));
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for (auto&& statement: _block.statements)
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if (holds_alternative<FunctionDefinition>(statement))
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{
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FunctionDefinition const& funDef = std::get<FunctionDefinition>(statement);
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if (!functionsToKeep.count(funDef.name))
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statement = Block{};
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}
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removeEmptyBlocks(_block);
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}
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set<YulString> CircularReferencesPruner::functionsCalledFromOutermostContext(CallGraph const& _callGraph)
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{
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set<YulString> verticesToTraverse = m_reservedIdentifiers;
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verticesToTraverse.insert(YulString(""));
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return util::BreadthFirstSearch<YulString>{{verticesToTraverse.begin(), verticesToTraverse.end()}}.run(
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[&_callGraph](YulString _function, auto&& _addChild) {
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if (_callGraph.functionCalls.count(_function))
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for (auto const& callee: _callGraph.functionCalls.at(_function))
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if (_callGraph.functionCalls.count(callee))
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_addChild(callee);
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}).visited;
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}
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