//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#define LLVM_ADT_POSTORDERITERATOR_H
#include "llvm/ADT/GraphTraits.h"
-#include "llvm/ADT/iterator"
-#include <stack>
+#include "llvm/ADT/SmallPtrSet.h"
#include <set>
#include <vector>
namespace llvm {
-template<class SetType, bool External> // Non-external set
-class po_iterator_storage {
-public:
- SetType Visited;
-};
-
-template<class SetType>
-class po_iterator_storage<SetType, true> {
-public:
- po_iterator_storage(SetType &VSet) : Visited(VSet) {}
- po_iterator_storage(const po_iterator_storage &S) : Visited(S.Visited) {}
- SetType &Visited;
-};
-
-template<class GraphT,
- class SetType = std::set<typename GraphTraits<GraphT>::NodeType*>,
- bool ExtStorage = false,
- class GT = GraphTraits<GraphT> >
-class po_iterator : public forward_iterator<typename GT::NodeType, ptrdiff_t>,
- public po_iterator_storage<SetType, ExtStorage> {
- typedef forward_iterator<typename GT::NodeType, ptrdiff_t> super;
+template<class SetType, bool External> // Non-external set
+class po_iterator_storage {
+public:
+ SetType Visited;
+};
+
+/// DFSetTraits - Allow the SetType used to record depth-first search results to
+/// optionally record node postorder.
+template<class SetType>
+struct DFSetTraits {
+ static void finishPostorder(
+ typename SetType::iterator::value_type, SetType &) {}
+};
+
+template<class SetType>
+class po_iterator_storage<SetType, true> {
+public:
+ po_iterator_storage(SetType &VSet) : Visited(VSet) {}
+ po_iterator_storage(const po_iterator_storage &S) : Visited(S.Visited) {}
+ SetType &Visited;
+};
+
+template<class GraphT,
+ class SetType = llvm::SmallPtrSet<typename GraphTraits<GraphT>::NodeType*, 8>,
+ bool ExtStorage = false,
+ class GT = GraphTraits<GraphT> >
+class po_iterator : public std::iterator<std::forward_iterator_tag,
+ typename GT::NodeType, ptrdiff_t>,
+ public po_iterator_storage<SetType, ExtStorage> {
+ typedef std::iterator<std::forward_iterator_tag,
+ typename GT::NodeType, ptrdiff_t> super;
typedef typename GT::NodeType NodeType;
typedef typename GT::ChildIteratorType ChildItTy;
-
+
// VisitStack - Used to maintain the ordering. Top = current block
// First element is basic block pointer, second is the 'next child' to visit
- std::stack<std::pair<NodeType *, ChildItTy> > VisitStack;
+ std::vector<std::pair<NodeType *, ChildItTy> > VisitStack;
void traverseChild() {
- while (VisitStack.top().second != GT::child_end(VisitStack.top().first)) {
- NodeType *BB = *VisitStack.top().second++;
- if (!this->Visited.count(BB)) { // If the block is not visited...
- this->Visited.insert(BB);
- VisitStack.push(std::make_pair(BB, GT::child_begin(BB)));
+ while (VisitStack.back().second != GT::child_end(VisitStack.back().first)) {
+ NodeType *BB = *VisitStack.back().second++;
+ if (this->Visited.insert(BB)) { // If the block is not visited...
+ VisitStack.push_back(std::make_pair(BB, GT::child_begin(BB)));
}
}
}
inline po_iterator(NodeType *BB) {
this->Visited.insert(BB);
- VisitStack.push(std::make_pair(BB, GT::child_begin(BB)));
+ VisitStack.push_back(std::make_pair(BB, GT::child_begin(BB)));
traverseChild();
}
- inline po_iterator() {} // End is when stack is empty.
-
- inline po_iterator(NodeType *BB, SetType &S) :
- po_iterator_storage<SetType, ExtStorage>(&S) {
- if(!S.count(BB)) {
- this->Visited.insert(BB);
- VisitStack.push(std::make_pair(BB, GT::child_begin(BB)));
- traverseChild();
- }
- }
-
- inline po_iterator(SetType &S) :
- po_iterator_storage<SetType, ExtStorage>(&S) {
- } // End is when stack is empty.
+ inline po_iterator() {} // End is when stack is empty.
+
+ inline po_iterator(NodeType *BB, SetType &S) :
+ po_iterator_storage<SetType, ExtStorage>(S) {
+ if (this->Visited.insert(BB)) {
+ VisitStack.push_back(std::make_pair(BB, GT::child_begin(BB)));
+ traverseChild();
+ }
+ }
+
+ inline po_iterator(SetType &S) :
+ po_iterator_storage<SetType, ExtStorage>(S) {
+ } // End is when stack is empty.
public:
typedef typename super::pointer pointer;
- typedef po_iterator<GraphT, SetType, ExtStorage, GT> _Self;
+ typedef po_iterator<GraphT, SetType, ExtStorage, GT> _Self;
// Provide static "constructors"...
static inline _Self begin(GraphT G) { return _Self(GT::getEntryNode(G)); }
static inline _Self end (GraphT G) { return _Self(); }
- static inline _Self begin(GraphT G, SetType &S) {
- return _Self(GT::getEntryNode(G), S);
- }
- static inline _Self end (GraphT G, SetType &S) { return _Self(S); }
-
+ static inline _Self begin(GraphT G, SetType &S) {
+ return _Self(GT::getEntryNode(G), S);
+ }
+ static inline _Self end (GraphT G, SetType &S) { return _Self(S); }
+
inline bool operator==(const _Self& x) const {
return VisitStack == x.VisitStack;
}
inline bool operator!=(const _Self& x) const { return !operator==(x); }
inline pointer operator*() const {
- return VisitStack.top().first;
+ return VisitStack.back().first;
}
// This is a nonstandard operator-> that dereferences the pointer an extra
inline NodeType *operator->() const { return operator*(); }
inline _Self& operator++() { // Preincrement
- VisitStack.pop();
+ DFSetTraits<SetType>::finishPostorder(VisitStack.back().first,
+ this->Visited);
+ VisitStack.pop_back();
if (!VisitStack.empty())
traverseChild();
return *this;
template <class T>
po_iterator<T> po_end (T G) { return po_iterator<T>::end(G); }
-// Provide global definitions of external postorder iterators...
-template<class T, class SetType=std::set<typename GraphTraits<T>::NodeType*> >
-struct po_ext_iterator : public po_iterator<T, SetType, true> {
- po_ext_iterator(const po_iterator<T, SetType, true> &V) :
- po_iterator<T, SetType, true>(V) {}
-};
-
-template<class T, class SetType>
-po_ext_iterator<T, SetType> po_ext_begin(T G, SetType &S) {
- return po_ext_iterator<T, SetType>::begin(G, S);
-}
-
-template<class T, class SetType>
-po_ext_iterator<T, SetType> po_ext_end(T G, SetType &S) {
- return po_ext_iterator<T, SetType>::end(G, S);
-}
+// Provide global definitions of external postorder iterators...
+template<class T, class SetType=std::set<typename GraphTraits<T>::NodeType*> >
+struct po_ext_iterator : public po_iterator<T, SetType, true> {
+ po_ext_iterator(const po_iterator<T, SetType, true> &V) :
+ po_iterator<T, SetType, true>(V) {}
+};
+
+template<class T, class SetType>
+po_ext_iterator<T, SetType> po_ext_begin(T G, SetType &S) {
+ return po_ext_iterator<T, SetType>::begin(G, S);
+}
+
+template<class T, class SetType>
+po_ext_iterator<T, SetType> po_ext_end(T G, SetType &S) {
+ return po_ext_iterator<T, SetType>::end(G, S);
+}
// Provide global definitions of inverse post order iterators...
-template <class T,
- class SetType = std::set<typename GraphTraits<T>::NoddeType*>,
- bool External = false>
-struct ipo_iterator : public po_iterator<Inverse<T>, SetType, External > {
- ipo_iterator(const po_iterator<Inverse<T>, SetType, External> &V) :
- po_iterator<Inverse<T>, SetType, External> (V) {}
+template <class T,
+ class SetType = std::set<typename GraphTraits<T>::NodeType*>,
+ bool External = false>
+struct ipo_iterator : public po_iterator<Inverse<T>, SetType, External > {
+ ipo_iterator(const po_iterator<Inverse<T>, SetType, External> &V) :
+ po_iterator<Inverse<T>, SetType, External> (V) {}
};
template <class T>
return ipo_iterator<T>::end(G);
}
-//Provide global definitions of external inverse postorder iterators...
-template <class T, class SetType = std::set<typename GraphTraits<T>::NodeType*> >
-struct ipo_ext_iterator : public ipo_iterator<T, SetType, true> {
- ipo_ext_iterator(const ipo_iterator<T, SetType, true> &V) :
- ipo_iterator<T, SetType, true>(&V) {}
- ipo_ext_iterator(const po_iterator<Inverse<T>, SetType, true> &V) :
- ipo_iterator<T, SetType, true>(&V) {}
-};
-
-template <class T, class SetType>
-ipo_ext_iterator<T, SetType> ipo_ext_begin(T G, SetType &S) {
- return ipo_ext_iterator<T, SetType>::begin(G, S);
-}
-
-template <class T, class SetType>
-ipo_ext_iterator<T, SetType> ipo_ext_end(T G, SetType &S) {
- return ipo_ext_iterator<T, SetType>::end(G, S);
-}
+//Provide global definitions of external inverse postorder iterators...
+template <class T,
+ class SetType = std::set<typename GraphTraits<T>::NodeType*> >
+struct ipo_ext_iterator : public ipo_iterator<T, SetType, true> {
+ ipo_ext_iterator(const ipo_iterator<T, SetType, true> &V) :
+ ipo_iterator<T, SetType, true>(&V) {}
+ ipo_ext_iterator(const po_iterator<Inverse<T>, SetType, true> &V) :
+ ipo_iterator<T, SetType, true>(&V) {}
+};
+
+template <class T, class SetType>
+ipo_ext_iterator<T, SetType> ipo_ext_begin(T G, SetType &S) {
+ return ipo_ext_iterator<T, SetType>::begin(G, S);
+}
+
+template <class T, class SetType>
+ipo_ext_iterator<T, SetType> ipo_ext_end(T G, SetType &S) {
+ return ipo_ext_iterator<T, SetType>::end(G, S);
+}
//===--------------------------------------------------------------------===//
// Reverse Post Order CFG iterator code