LLVM
13.0.0git

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/GraphTraits.h"
#include "llvm/ADT/iterator.h"
#include <cassert>
#include <cstddef>
#include <iterator>
#include <vector>
Go to the source code of this file.
Classes  
class  llvm::scc_iterator< GraphT, GT > 
Enumerate the SCCs of a directed graph in reverse topological order of the SCC DAG. More...  
Namespaces  
llvm  
Functions  
template<class T >  
scc_iterator< T >  llvm::scc_begin (const T &G) 
Construct the begin iterator for a deduced graph type T. More...  
template<class T >  
scc_iterator< T >  llvm::scc_end (const T &G) 
Construct the end iterator for a deduced graph type T. More...  
This builds on the llvm/ADT/GraphTraits.h file to find the strongly connected components (SCCs) of a graph in O(N+E) time using Tarjan's DFS algorithm.
The SCC iterator has the important property that if a node in SCC S1 has an edge to a node in SCC S2, then it visits S1 after S2.
To visit S1 before S2, use the scc_iterator on the Inverse graph. (NOTE: This requires some simple wrappers and is not supported yet.)
Definition in file SCCIterator.h.