mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
109 lines
3.0 KiB
C++
109 lines
3.0 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 walker that generates the call graph.
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*/
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#include <libyul/AST.h>
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#include <libyul/optimiser/CallGraphGenerator.h>
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#include <libsolutil/CommonData.h>
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#include <stack>
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using namespace solidity;
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using namespace solidity::yul;
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using namespace solidity::util;
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namespace
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{
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// TODO: This algorithm is non-optimal.
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struct CallGraphCycleFinder
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{
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CallGraph const& callGraph;
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std::set<YulString> containedInCycle{};
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std::set<YulString> visited{};
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std::vector<YulString> currentPath{};
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void visit(YulString _function)
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{
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if (visited.count(_function))
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return;
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if (
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auto it = find(currentPath.begin(), currentPath.end(), _function);
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it != currentPath.end()
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)
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containedInCycle.insert(it, currentPath.end());
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else
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{
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currentPath.emplace_back(_function);
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if (callGraph.functionCalls.count(_function))
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for (auto const& child: callGraph.functionCalls.at(_function))
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visit(child);
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currentPath.pop_back();
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visited.insert(_function);
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}
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}
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};
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}
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std::set<YulString> CallGraph::recursiveFunctions() const
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{
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CallGraphCycleFinder cycleFinder{*this};
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// Visiting the root only is not enough, since there may be disconnected recursive functions.
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for (auto const& call: functionCalls)
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cycleFinder.visit(call.first);
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return cycleFinder.containedInCycle;
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}
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CallGraph CallGraphGenerator::callGraph(Block const& _ast)
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{
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CallGraphGenerator gen;
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gen(_ast);
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return std::move(gen.m_callGraph);
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}
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void CallGraphGenerator::operator()(FunctionCall const& _functionCall)
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{
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auto& functionCalls = m_callGraph.functionCalls[m_currentFunction];
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if (!util::contains(functionCalls, _functionCall.functionName.name))
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functionCalls.emplace_back(_functionCall.functionName.name);
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ASTWalker::operator()(_functionCall);
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}
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void CallGraphGenerator::operator()(ForLoop const& _forLoop)
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{
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m_callGraph.functionsWithLoops.insert(m_currentFunction);
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ASTWalker::operator()(_forLoop);
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}
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void CallGraphGenerator::operator()(FunctionDefinition const& _functionDefinition)
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{
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YulString previousFunction = m_currentFunction;
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m_currentFunction = _functionDefinition.name;
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yulAssert(m_callGraph.functionCalls.count(m_currentFunction) == 0, "");
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m_callGraph.functionCalls[m_currentFunction] = {};
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ASTWalker::operator()(_functionDefinition);
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m_currentFunction = previousFunction;
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}
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CallGraphGenerator::CallGraphGenerator()
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{
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m_callGraph.functionCalls[YulString{}] = {};
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}
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