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Implement external storage for post-order iteration, implementing PR267

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Patch by Saem Ghani, thanks!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24617 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-12-06 07:05:27 +00:00
parent 8cfa57b1b4
commit 767a033a5c
1 changed files with 84 additions and 10 deletions
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94
include/llvm/ADT/PostOrderIterator.h
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@ -23,8 +23,26 @@
namespace llvm {
template<class GraphT, class GT = GraphTraits<GraphT> >
class po_iterator : public forward_iterator<typename GT::NodeType, ptrdiff_t> {
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;
typedef typename GT::NodeType NodeType;
typedef typename GT::ChildIteratorType ChildItTy;
@ -37,27 +55,45 @@ class po_iterator : public forward_iterator<typename GT::NodeType, ptrdiff_t> {
void traverseChild() {
while (VisitStack.top().second != GT::child_end(VisitStack.top().first)) {
NodeType *BB = *VisitStack.top().second++;
if (!Visited.count(BB)) { // If the block is not visited...
Visited.insert(BB);
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)));
}
}
}
inline po_iterator(NodeType *BB) {
Visited.insert(BB);
this->Visited.insert(BB);
VisitStack.push(std::make_pair(BB, GT::child_begin(BB)));
traverseChild();
}
inline po_iterator() { /* 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(!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.
public:
typedef typename super::pointer pointer;
typedef po_iterator<GraphT, 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); }
inline bool operator==(const _Self& x) const {
return VisitStack == x.VisitStack;
}
@ -92,10 +128,30 @@ po_iterator<T> po_begin(T G) { return po_iterator<T>::begin(G); }
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 inverse post order iterators...
template <class T>
struct ipo_iterator : public po_iterator<Inverse<T> > {
ipo_iterator(const po_iterator<Inverse<T> > &V) :po_iterator<Inverse<T> >(V){}
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>
@ -108,6 +164,24 @@ ipo_iterator<T> ipo_end(T G){
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);
}
//===--------------------------------------------------------------------===//
// Reverse Post Order CFG iterator code