Initial checkin of file:

Define an iterator to operate over data structure outgoing links and
graph implementation so generic graph functions can be used.

llvm-svn: 2057

include/llvm/Analysis/DSGraphTraits.h

@@ -0,0 +1,67 @@
+//===- DataStructureGraph.h - Provide graph classes --------------*- C++ -*--=//
+//
+// This file provides GraphTraits specializations for the DataStructure graph
+// nodes, allowing datastructure graphs to be processed by generic graph
+// algorithms.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_DATASTRUCTURE_GRAPH_H
+#define LLVM_ANALYSIS_DATASTRUCTURE_GRAPH_H
+
+#include "Support/GraphTraits.h"
+#include "llvm/Analysis/DataStructure.h"
+#include "llvm/Value.h"  // FIXME: Move cast/dyn_cast out to Support
+
+class DSNodeIterator : public std::forward_iterator<DSNode, ptrdiff_t> {
+  DSNode * const Node;
+  unsigned Link;
+  unsigned LinkIdx;
+  
+  typedef DSNodeIterator _Self;
+public:
+  DSNodeIterator(DSNode *N) : Node(N), Link(0), LinkIdx(0) {}  // begin iterator
+  DSNodeIterator(DSNode *N, bool)       // Create end iterator
+    : Node(N), Link(N->getNumOutgoingLinks()), LinkIdx(0) {
+  }
+
+  bool operator==(const _Self& x) const {
+    return Link == x.Link && LinkIdx == x.LinkIdx;
+  }
+  bool operator!=(const _Self& x) const { return !operator==(x); }
+  
+  pointer operator*() const {
+    return Node->getOutgoingLink(Link)[LinkIdx].getNode();
+  }
+  pointer operator->() const { return operator*(); }
+  
+  _Self& operator++() {                // Preincrement
+    if (LinkIdx < Node->getOutgoingLink(Link).size()-1)
+      ++LinkIdx;
+    else {
+      ++Link;
+      LinkIdx = 0;
+    }
+    return *this;
+  }
+  _Self operator++(int) { // Postincrement
+    _Self tmp = *this; ++*this; return tmp; 
+  }
+};
+
+
+template <> struct GraphTraits<DSNode*> {
+  typedef DSNode NodeType;
+  typedef DSNodeIterator ChildIteratorType;
+
+  static NodeType *getEntryNode(DSNode *N) { return N; }
+  static ChildIteratorType child_begin(NodeType *N) { 
+    return DSNodeIterator(N);
+  }
+  static ChildIteratorType child_end(NodeType *N) { 
+    return DSNodeIterator(N, true);
+  }
+};
+
+
+#endif

include/llvm/Analysis/DataStructureGraph.h

@@ -0,0 +1,67 @@
+//===- DataStructureGraph.h - Provide graph classes --------------*- C++ -*--=//
+//
+// This file provides GraphTraits specializations for the DataStructure graph
+// nodes, allowing datastructure graphs to be processed by generic graph
+// algorithms.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_DATASTRUCTURE_GRAPH_H
+#define LLVM_ANALYSIS_DATASTRUCTURE_GRAPH_H
+
+#include "Support/GraphTraits.h"
+#include "llvm/Analysis/DataStructure.h"
+#include "llvm/Value.h"  // FIXME: Move cast/dyn_cast out to Support
+
+class DSNodeIterator : public std::forward_iterator<DSNode, ptrdiff_t> {
+  DSNode * const Node;
+  unsigned Link;
+  unsigned LinkIdx;
+  
+  typedef DSNodeIterator _Self;
+public:
+  DSNodeIterator(DSNode *N) : Node(N), Link(0), LinkIdx(0) {}  // begin iterator
+  DSNodeIterator(DSNode *N, bool)       // Create end iterator
+    : Node(N), Link(N->getNumOutgoingLinks()), LinkIdx(0) {
+  }
+
+  bool operator==(const _Self& x) const {
+    return Link == x.Link && LinkIdx == x.LinkIdx;
+  }
+  bool operator!=(const _Self& x) const { return !operator==(x); }
+  
+  pointer operator*() const {
+    return Node->getOutgoingLink(Link)[LinkIdx].getNode();
+  }
+  pointer operator->() const { return operator*(); }
+  
+  _Self& operator++() {                // Preincrement
+    if (LinkIdx < Node->getOutgoingLink(Link).size()-1)
+      ++LinkIdx;
+    else {
+      ++Link;
+      LinkIdx = 0;
+    }
+    return *this;
+  }
+  _Self operator++(int) { // Postincrement
+    _Self tmp = *this; ++*this; return tmp; 
+  }
+};
+
+
+template <> struct GraphTraits<DSNode*> {
+  typedef DSNode NodeType;
+  typedef DSNodeIterator ChildIteratorType;
+
+  static NodeType *getEntryNode(DSNode *N) { return N; }
+  static ChildIteratorType child_begin(NodeType *N) { 
+    return DSNodeIterator(N);
+  }
+  static ChildIteratorType child_end(NodeType *N) { 
+    return DSNodeIterator(N, true);
+  }
+};
+
+
+#endif