DepthFirstIterator.h revision a2769a33c94f021a609a462b28ebea069eba6f74
1551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer//===- llvm/ADT/DepthFirstIterator.h - Depth First iterator -----*- C++ -*-===// 29769ab22265b313171d201b5928688524a01bd87Misha Brukman// 3b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell// The LLVM Compiler Infrastructure 4b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell// 57ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// This file is distributed under the University of Illinois Open Source 67ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// License. See LICENSE.TXT for details. 79769ab22265b313171d201b5928688524a01bd87Misha Brukman// 8b2109ce97881269a610fa4afbcbca350e975174dJohn Criswell//===----------------------------------------------------------------------===// 97461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner// 10551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer// This file builds on the ADT/GraphTraits.h file to build generic depth 114846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner// first graph iterator. This file exposes the following functions/types: 124846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner// 134846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner// df_begin/df_end/df_iterator 144846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner// * Normal depth-first iteration - visit a node and then all of its children. 154846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner// 164846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner// idf_begin/idf_end/idf_iterator 174846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner// * Depth-first iteration on the 'inverse' graph. 187461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner// 199061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// df_ext_begin/df_ext_end/df_ext_iterator 209061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// * Normal depth-first iteration - visit a node and then all of its children. 219061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// This iterator stores the 'visited' set in an external set, which allows 229061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// it to be more efficient, and allows external clients to use the set for 239061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// other purposes. 249061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// 259061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// idf_ext_begin/idf_ext_end/idf_ext_iterator 269061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// * Depth-first iteration on the 'inverse' graph. 279061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// This iterator stores the 'visited' set in an external set, which allows 289061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// it to be more efficient, and allows external clients to use the set for 299061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// other purposes. 309061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// 317461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner//===----------------------------------------------------------------------===// 327461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 33551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#ifndef LLVM_ADT_DEPTHFIRSTITERATOR_H 34551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#define LLVM_ADT_DEPTHFIRSTITERATOR_H 357461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 36551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/GraphTraits.h" 3743d1fd449f1a0ac9d9dafa0b9569bb6b2e976198Anton Korobeynikov#include "llvm/ADT/iterator.h" 38d3fb6714802d8e44b34980af8772cc3ed398e71aOwen Anderson#include "llvm/ADT/SmallPtrSet.h" 397461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner#include <set> 40a2769a33c94f021a609a462b28ebea069eba6f74Misha Brukman#include <vector> 417461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 42d0fde30ce850b78371fd1386338350591f9ff494Brian Gaekenamespace llvm { 43d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 449061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// df_iterator_storage - A private class which is used to figure out where to 459061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// store the visited set. 469061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnertemplate<class SetType, bool External> // Non-external set 479061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnerclass df_iterator_storage { 489061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnerpublic: 499061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner SetType Visited; 509061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner}; 519061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 529061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnertemplate<class SetType> 539061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnerclass df_iterator_storage<SetType, true> { 549061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnerpublic: 559061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner df_iterator_storage(SetType &VSet) : Visited(VSet) {} 569061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner df_iterator_storage(const df_iterator_storage &S) : Visited(S.Visited) {} 579061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner SetType &Visited; 589061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner}; 599061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 609061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 617461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner// Generic Depth First Iterator 62d3fb6714802d8e44b34980af8772cc3ed398e71aOwen Andersontemplate<class GraphT, 63d3fb6714802d8e44b34980af8772cc3ed398e71aOwen Andersonclass SetType = llvm::SmallPtrSet<typename GraphTraits<GraphT>::NodeType*, 8>, 649061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner bool ExtStorage = false, class GT = GraphTraits<GraphT> > 659061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnerclass df_iterator : public forward_iterator<typename GT::NodeType, ptrdiff_t>, 669061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner public df_iterator_storage<SetType, ExtStorage> { 677f4dd472e35569efefbeffef096c490075e3e824Chris Lattner typedef forward_iterator<typename GT::NodeType, ptrdiff_t> super; 687f4dd472e35569efefbeffef096c490075e3e824Chris Lattner 697461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner typedef typename GT::NodeType NodeType; 707461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner typedef typename GT::ChildIteratorType ChildItTy; 717461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 727461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // VisitStack - Used to maintain the ordering. Top = current block 737461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // First element is node pointer, second is the 'next child' to visit 744846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner std::vector<std::pair<NodeType *, ChildItTy> > VisitStack; 757461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattnerprivate: 764846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner inline df_iterator(NodeType *Node) { 779061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner this->Visited.insert(Node); 784846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner VisitStack.push_back(std::make_pair(Node, GT::child_begin(Node))); 797461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner } 807461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner inline df_iterator() { /* End is when stack is empty */ } 817461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 829061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner inline df_iterator(NodeType *Node, SetType &S) 839061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner : df_iterator_storage<SetType, ExtStorage>(S) { 849061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner if (!S.count(Node)) { 859061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner this->Visited.insert(Node); 869061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner VisitStack.push_back(std::make_pair(Node, GT::child_begin(Node))); 879061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner } 889061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner } 899769ab22265b313171d201b5928688524a01bd87Misha Brukman inline df_iterator(SetType &S) 909061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner : df_iterator_storage<SetType, ExtStorage>(S) { 919061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner // End is when stack is empty 929061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner } 939061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 947461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattnerpublic: 9502a31a5af68aaca1b54c7121f04cb56828ccefc2Chris Lattner typedef typename super::pointer pointer; 969061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner typedef df_iterator<GraphT, SetType, ExtStorage, GT> _Self; 977461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 987461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // Provide static begin and end methods as our public "constructors" 99ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov static inline _Self begin(const GraphT& G) { 1004846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner return _Self(GT::getEntryNode(G)); 1017461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner } 102ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov static inline _Self end(const GraphT& G) { return _Self(); } 1037461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1049061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner // Static begin and end methods as our public ctors for external iterators 105ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov static inline _Self begin(const GraphT& G, SetType &S) { 1069061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner return _Self(GT::getEntryNode(G), S); 1079061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner } 108ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov static inline _Self end(const GraphT& G, SetType &S) { return _Self(S); } 1097461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1109769ab22265b313171d201b5928688524a01bd87Misha Brukman inline bool operator==(const _Self& x) const { 1114846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner return VisitStack.size() == x.VisitStack.size() && 1124846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner VisitStack == x.VisitStack; 1137461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner } 1147461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner inline bool operator!=(const _Self& x) const { return !operator==(x); } 1157461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1169769ab22265b313171d201b5928688524a01bd87Misha Brukman inline pointer operator*() const { 1174846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner return VisitStack.back().first; 1187461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner } 1197461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1207461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // This is a nonstandard operator-> that dereferences the pointer an extra 1217461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // time... so that you can actually call methods ON the Node, because 1227461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // the contained type is a pointer. This allows BBIt->getTerminator() f.e. 1237461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // 1247461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner inline NodeType *operator->() const { return operator*(); } 1257461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1267461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner inline _Self& operator++() { // Preincrement 1274846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner do { 1284846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner std::pair<NodeType *, ChildItTy> &Top = VisitStack.back(); 1294846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner NodeType *Node = Top.first; 1304846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner ChildItTy &It = Top.second; 1319769ab22265b313171d201b5928688524a01bd87Misha Brukman 1324846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner while (It != GT::child_end(Node)) { 1334846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner NodeType *Next = *It++; 1349061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner if (!this->Visited.count(Next)) { // Has our next sibling been visited? 1354846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner // No, do it now. 1369061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner this->Visited.insert(Next); 1374846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner VisitStack.push_back(std::make_pair(Next, GT::child_begin(Next))); 1384846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner return *this; 1394846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner } 1404846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner } 1419769ab22265b313171d201b5928688524a01bd87Misha Brukman 1424846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner // Oops, ran out of successors... go up a level on the stack. 1434846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner VisitStack.pop_back(); 1444846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner } while (!VisitStack.empty()); 1459769ab22265b313171d201b5928688524a01bd87Misha Brukman return *this; 1467461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner } 1477461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1487461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner inline _Self operator++(int) { // Postincrement 1499769ab22265b313171d201b5928688524a01bd87Misha Brukman _Self tmp = *this; ++*this; return tmp; 1507461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner } 1517461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1527461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // nodeVisited - return true if this iterator has already visited the 1537461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // specified node. This is public, and will probably be used to iterate over 1547461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // nodes that a depth first iteration did not find: ie unreachable nodes. 1557461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner // 1569769ab22265b313171d201b5928688524a01bd87Misha Brukman inline bool nodeVisited(NodeType *Node) const { 1579061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner return this->Visited.count(Node) != 0; 1587461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner } 1597461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner}; 1607461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1617461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1627461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner// Provide global constructors that automatically figure out correct types... 1637461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner// 1647461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattnertemplate <class T> 165ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikovdf_iterator<T> df_begin(const T& G) { 1664846f4b87a31797ba0bc6c96862a1128acf16149Chris Lattner return df_iterator<T>::begin(G); 1677461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner} 1687461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1697461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattnertemplate <class T> 170ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikovdf_iterator<T> df_end(const T& G) { 1717461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner return df_iterator<T>::end(G); 1727461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner} 1737461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 1749061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// Provide global definitions of external depth first iterators... 1751e79609e304a24e0cad68534ddf3371479d33b86Chris Lattnertemplate <class T, class SetTy = std::set<typename GraphTraits<T>::NodeType*> > 1769061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnerstruct df_ext_iterator : public df_iterator<T, SetTy, true> { 1779061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner df_ext_iterator(const df_iterator<T, SetTy, true> &V) 1789061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner : df_iterator<T, SetTy, true>(V) {} 1799061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner}; 1809061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 1819061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnertemplate <class T, class SetTy> 182ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikovdf_ext_iterator<T, SetTy> df_ext_begin(const T& G, SetTy &S) { 1839061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner return df_ext_iterator<T, SetTy>::begin(G, S); 1849061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner} 1859061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 1869061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnertemplate <class T, class SetTy> 187ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikovdf_ext_iterator<T, SetTy> df_ext_end(const T& G, SetTy &S) { 1889061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner return df_ext_iterator<T, SetTy>::end(G, S); 1899061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner} 1909061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 1919061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 1927461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner// Provide global definitions of inverse depth first iterators... 193d3fb6714802d8e44b34980af8772cc3ed398e71aOwen Andersontemplate <class T, 194d3fb6714802d8e44b34980af8772cc3ed398e71aOwen Anderson class SetTy = llvm::SmallPtrSet<typename GraphTraits<T>::NodeType*, 8>, 1959061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner bool External = false> 1969061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnerstruct idf_iterator : public df_iterator<Inverse<T>, SetTy, External> { 1979061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner idf_iterator(const df_iterator<Inverse<T>, SetTy, External> &V) 1989061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner : df_iterator<Inverse<T>, SetTy, External>(V) {} 1997461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner}; 2007461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 2017461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattnertemplate <class T> 202ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikovidf_iterator<T> idf_begin(const T& G) { 203ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov Inverse<T> DummyG; 204ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov return idf_iterator<T>::begin(DummyG); 2057461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner} 2067461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 2077461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattnertemplate <class T> 208ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikovidf_iterator<T> idf_end(const T& G){ 209ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov Inverse<T> DummyG; 210ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov return idf_iterator<T>::end(DummyG); 2117461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner} 2127461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner 2139061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner// Provide global definitions of external inverse depth first iterators... 2149061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnertemplate <class T, class SetTy = std::set<typename GraphTraits<T>::NodeType*> > 2159061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnerstruct idf_ext_iterator : public idf_iterator<T, SetTy, true> { 2169061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner idf_ext_iterator(const idf_iterator<T, SetTy, true> &V) 2179061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner : idf_iterator<T, SetTy, true>(V) {} 2189061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner idf_ext_iterator(const df_iterator<Inverse<T>, SetTy, true> &V) 2199061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner : idf_iterator<T, SetTy, true>(V) {} 2209061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner}; 2219061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 2229061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnertemplate <class T, class SetTy> 223ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikovidf_ext_iterator<T, SetTy> idf_ext_begin(const T& G, SetTy &S) { 224ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov Inverse<T> DummyG(G); 225ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov return idf_ext_iterator<T, SetTy>::begin(DummyG, S); 2269061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner} 2279061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 2289061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattnertemplate <class T, class SetTy> 229ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikovidf_ext_iterator<T, SetTy> idf_ext_end(const T& G, SetTy &S) { 230ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov Inverse<T> DummyG(G); 231ffe9e63c4a11352fd6437588fad516efdb46aa40Anton Korobeynikov return idf_ext_iterator<T, SetTy>::end(DummyG, S); 2329061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner} 2339061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 234d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke} // End llvm namespace 2359061e992d5ee0c59c89ae7812c551bafd680a59cChris Lattner 2367461bf5f8e1e9be67f4ce19f35a32a88668934c7Chris Lattner#endif 237