Add an isNodeHidden to the graph traits, to support definition of

subgraph views.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103772 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 24 insertions, 3 deletions

diff --git a/include/llvm/Support/DOTGraphTraits.h b/include/llvm/Support/DOTGraphTraits.h
index ebbcf7c400..c16aa3a76d 100644
--- a/include/llvm/Support/DOTGraphTraits.h
+++ b/include/llvm/Support/DOTGraphTraits.h
@@ -59,6 +59,12 @@ public:
     return false;
   }
 
+  /// isNodeHidden - If thie function returns true, the given node is not
+  /// displayed in the graph.
+  static bool isNodeHidden(const void *Node) {
+    return false;
+  }
+
   /// getNodeLabel - Given a node and a pointer to the top level graph, return
   /// the label to print in the node.
   template<typename GraphType>
diff --git a/include/llvm/Support/GraphWriter.h b/include/llvm/Support/GraphWriter.h
index 13e6682ebf..559f0040c2 100644
--- a/include/llvm/Support/GraphWriter.h
+++ b/include/llvm/Support/GraphWriter.h
@@ -122,7 +122,20 @@ public:
     // Loop over the graph, printing it out...
     for (node_iterator I = GTraits::nodes_begin(G), E = GTraits::nodes_end(G);
          I != E; ++I)
-      writeNode(*I);
+      if (!isNodeHidden(*I))
+        writeNode(*I);
+  }
+
+  bool isNodeHidden(NodeType &Node) {
+    return isNodeHidden(&Node);
+  }
+
+  bool isNodeHidden(NodeType *const *Node) {
+    return isNodeHidden(*Node);
+  }
+
+  bool isNodeHidden(NodeType *Node) {
+    return DTraits.isNodeHidden(Node);
   }
 
   void writeNode(NodeType& Node) {
@@ -189,9 +202,11 @@ public:
     child_iterator EI = GTraits::child_begin(Node);
     child_iterator EE = GTraits::child_end(Node);
     for (unsigned i = 0; EI != EE && i != 64; ++EI, ++i)
-      writeEdge(Node, i, EI);
+      if (!DTraits.isNodeHidden(*EI))
+        writeEdge(Node, i, EI);
     for (; EI != EE; ++EI)
-      writeEdge(Node, 64, EI);
+      if (!DTraits.isNodeHidden(*EI))
+        writeEdge(Node, 64, EI);
   }
 
   void writeEdge(NodeType *Node, unsigned edgeidx, child_iterator EI) {