X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FPostOrderIterator.h;h=227472b2dd74274826eda7950ed7750960821fd9;hb=aafa94260d5b1b6422258ed3db7244fe4449f217;hp=4f94141b5c4406d21f7400a6f5c560b67d036f2d;hpb=8dc67168ccbd09821ff6d963b26461e9b47028e7;p=oota-llvm.git

diff --git a/include/llvm/ADT/PostOrderIterator.h b/include/llvm/ADT/PostOrderIterator.h
index 4f94141b5c4..227472b2dd7 100644
--- a/include/llvm/ADT/PostOrderIterator.h
+++ b/include/llvm/ADT/PostOrderIterator.h
@@ -1,27 +1,54 @@
-//===-- Support/PostOrderIterator.h - Generic PostOrder iterator -*- C++ -*--=//
+//===- llvm/ADT/PostOrderIterator.h - PostOrder iterator --------*- C++ -*-===//
 //
-// This file builds on the Support/GraphTraits.h file to build a generic graph
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file builds on the ADT/GraphTraits.h file to build a generic graph
 // post order iterator.  This should work over any graph type that has a
 // GraphTraits specialization.
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_SUPPORT_POSTORDER_ITERATOR_H
-#define LLVM_SUPPORT_POSTORDER_ITERATOR_H
+#ifndef LLVM_ADT_POSTORDERITERATOR_H
+#define LLVM_ADT_POSTORDERITERATOR_H
 
-#include "Support/GraphTraits.h"
-#include <Support/iterator>
-#include <stack>
+#include "llvm/ADT/GraphTraits.h"
+#include "llvm/ADT/iterator.h"
+#include "llvm/ADT/SmallPtrSet.h"
 #include <set>
+#include <stack>
+#include <vector>
 
-template<class GraphT, class GT = GraphTraits<GraphT> >
-class po_iterator : public forward_iterator<typename GT::NodeType, ptrdiff_t> {
+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 = llvm::SmallPtrSet<typename GraphTraits<GraphT>::NodeType*, 8>,
+  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 super::pointer pointer;
   typedef typename GT::NodeType          NodeType;
   typedef typename GT::ChildIteratorType ChildItTy;
 
-  std::set<NodeType *> Visited;    // All of the blocks visited so far...
   // 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;
@@ -29,32 +56,51 @@ 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);
-	VisitStack.push(make_pair(BB, GT::child_begin(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);
-    VisitStack.push(make_pair(BB, GT::child_begin(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 po_iterator<GraphT, GT> _Self;
+  typedef typename super::pointer pointer;
+  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(); }
 
-  inline bool operator==(const _Self& x) const { 
+  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 { 
+  inline pointer operator*() const {
     return VisitStack.top().first;
   }
 
@@ -68,11 +114,11 @@ public:
     VisitStack.pop();
     if (!VisitStack.empty())
       traverseChild();
-    return *this; 
+    return *this;
   }
 
   inline _Self operator++(int) { // Postincrement
-    _Self tmp = *this; ++*this; return tmp; 
+    _Self tmp = *this; ++*this; return tmp;
   }
 };
 
@@ -83,10 +129,30 @@ 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>::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>
@@ -99,21 +165,40 @@ 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
 //===--------------------------------------------------------------------===//
-// 
+//
 // This is used to visit basic blocks in a method in reverse post order.  This
 // class is awkward to use because I don't know a good incremental algorithm to
-// computer RPO from a graph.  Because of this, the construction of the 
+// computer RPO from a graph.  Because of this, the construction of the
 // ReversePostOrderTraversal object is expensive (it must walk the entire graph
 // with a postorder iterator to build the data structures).  The moral of this
-// story is: Don't create more ReversePostOrderTraversal classes than neccesary.
+// story is: Don't create more ReversePostOrderTraversal classes than necessary.
 //
 // This class should be used like this:
 // {
-//   ReversePostOrderTraversal<Method*> RPOT(MethodPtr); // Expensive to create
+//   ReversePostOrderTraversal<Function*> RPOT(FuncPtr); // Expensive to create
 //   for (rpo_iterator I = RPOT.begin(); I != RPOT.end(); ++I) {
 //      ...
 //   }
@@ -131,7 +216,7 @@ class ReversePostOrderTraversal {
     copy(po_begin(BB), po_end(BB), back_inserter(Blocks));
   }
 public:
-  typedef std::vector<NodeType*>::reverse_iterator rpo_iterator;
+  typedef typename std::vector<NodeType*>::reverse_iterator rpo_iterator;
 
   inline ReversePostOrderTraversal(GraphT G) {
     Initialize(GT::getEntryNode(G));
@@ -142,4 +227,6 @@ public:
   inline rpo_iterator end()   { return Blocks.rend(); }
 };
 
+} // End llvm namespace
+
 #endif