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[oota-llvm.git] / include / llvm / Analysis / CallGraph.h

diff --git a/include/llvm/Analysis/CallGraph.h b/include/llvm/Analysis/CallGraph.h
index bc022e3417e1dca41fcd625f0f89e726ff51847d..a4884edd5bd6b42328d3e5be2bce938ec01026ff 100644 (file)
--- a/include/llvm/Analysis/CallGraph.h
+++ b/include/llvm/Analysis/CallGraph.h
@@ -51,10 +51,12 @@
 #ifndef LLVM_ANALYSIS_CALLGRAPH_H
 #define LLVM_ANALYSIS_CALLGRAPH_H
 
+#include "llvm/Function.h"
+#include "llvm/Pass.h"
 #include "llvm/ADT/GraphTraits.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Pass.h"
 #include "llvm/Support/CallSite.h"
+#include "llvm/Support/ValueHandle.h"
 #include "llvm/System/IncludeFile.h"
 #include <map>
 
@@ -107,6 +109,7 @@ public:
   /// Returns the CallGraphNode which is used to represent undetermined calls
   /// into the callgraph.  Override this if you want behavioral inheritance.
   virtual CallGraphNode* getExternalCallingNode() const { return 0; }
+  virtual CallGraphNode* getCallsExternalNode()   const { return 0; }
 
   /// Return the root/main method in the module, or some other root node, such
   /// as the externalcallingnode.  Overload these if you behavioral
@@ -157,11 +160,16 @@ protected:
 };
 
 //===----------------------------------------------------------------------===//
-// CallGraphNode class definition
+// CallGraphNode class definition.
 //
 class CallGraphNode {
-  Function *F;
-  typedef std::pair<CallSite,CallGraphNode*> CallRecord;
+  AssertingVH<Function> F;
+  
+  // CallRecord - This is a pair of the calling instruction (a call or invoke)
+  // and the callgraph node being called.
+public:
+  typedef std::pair<WeakVH, CallGraphNode*> CallRecord;
+private:
   std::vector<CallRecord> CalledFunctions;
   
   /// NumReferences - This is the number of times that this CallGraphNode occurs
@@ -179,6 +187,9 @@ public:
   
   // CallGraphNode ctor - Create a node for the specified function.
   inline CallGraphNode(Function *f) : F(f), NumReferences(0) {}
+  ~CallGraphNode() {
+    assert(NumReferences == 0 && "Node deleted while references remain");
+  }
   
   //===---------------------------------------------------------------------
   // Accessor methods.
@@ -239,10 +250,17 @@ public:
   /// addCalledFunction - Add a function to the list of functions called by this
   /// one.
   void addCalledFunction(CallSite CS, CallGraphNode *M) {
-    CalledFunctions.push_back(std::make_pair(CS, M));
+    CalledFunctions.push_back(std::make_pair(CS.getInstruction(), M));
     M->AddRef();
   }
 
+  void removeCallEdge(iterator I) {
+    I->second->DropRef();
+    *I = CalledFunctions.back();
+    CalledFunctions.pop_back();
+  }
+  
+  
   /// removeCallEdgeFor - This method removes the edge in the node for the
   /// specified call site.  Note that this method takes linear time, so it
   /// should be used sparingly.
@@ -256,11 +274,17 @@ public:
   /// removeOneAbstractEdgeTo - Remove one edge associated with a null callsite
   /// from this node to the specified callee function.
   void removeOneAbstractEdgeTo(CallGraphNode *Callee);
-
-  /// replaceCallSite - Make the edge in the node for Old CallSite be for
-  /// New CallSite instead.  Note that this method takes linear time, so it
-  /// should be used sparingly.
-  void replaceCallSite(CallSite Old, CallSite New, CallGraphNode *NewCallee);
+  
+  /// replaceCallEdge - This method replaces the edge in the node for the
+  /// specified call site with a new one.  Note that this method takes linear
+  /// time, so it should be used sparingly.
+  void replaceCallEdge(CallSite CS, CallSite NewCS, CallGraphNode *NewNode);
+  
+  /// allReferencesDropped - This is a special function that should only be
+  /// used by the CallGraph class.
+  void allReferencesDropped() {
+    NumReferences = 0;
+  }
 };
 
 //===----------------------------------------------------------------------===//
@@ -273,7 +297,7 @@ public:
 template <> struct GraphTraits<CallGraphNode*> {
   typedef CallGraphNode NodeType;
 
-  typedef std::pair<CallSite, CallGraphNode*> CGNPairTy;
+  typedef CallGraphNode::CallRecord CGNPairTy;
   typedef std::pointer_to_unary_function<CGNPairTy, CallGraphNode*> CGNDerefFun;
 
   static NodeType *getEntryNode(CallGraphNode *CGN) { return CGN; }