Initial support for construction of a call graph

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@660 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 88 insertions, 0 deletions

diff --git a/include/llvm/Analysis/CallGraph.h b/include/llvm/Analysis/CallGraph.h
new file mode 100644
index 0000000..0683623
--- /dev/null
+++ b/include/llvm/Analysis/CallGraph.h
@@ -0,0 +1,88 @@
+//===- llvm/Analysis/CallGraph.h - Build a Module's call graph ---*- C++ -*--=//
+//
+// This interface is used to build and manipulate a call graph, which is a very 
+// useful tool for interprocedural optimization.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_CALLGRAPH_H
+#define LLVM_ANALYSIS_CALLGRAPH_H
+
+#include <map>
+#include <vector>
+class Method;
+class Module;
+
+namespace cfg {
+
+class CallGraph;
+class CallGraphNode {
+  Method *Meth;
+  vector<CallGraphNode*> CalledMethods;
+
+  CallGraphNode(const CallGraphNode &);           // Do not implement
+public:
+  typedef vector<CallGraphNode*>::iterator iterator;
+  typedef vector<CallGraphNode*>::const_iterator const_iterator;
+
+  // getMethod - Return the method that this call graph node represents...
+  Method *getMethod() const { return Meth; }
+
+  inline iterator begin() { return CalledMethods.begin(); }
+  inline iterator end()   { return CalledMethods.end();   }
+  inline const_iterator begin() const { return CalledMethods.begin(); }
+  inline const_iterator end()   const { return CalledMethods.end();   }
+  inline unsigned size() const { return CalledMethods.size(); }
+
+  inline CallGraphNode *operator[](unsigned i) const { return CalledMethods[i];}
+
+
+private:                    // Stuff to construct the node, used by CallGraph
+  friend class CallGraph;
+
+  // CallGraphNode ctor - Create a node for the specified method...
+  inline CallGraphNode(Method *M) : Meth(M) {}
+  
+  // addCalledMethod add a method to the list of methods called by this one
+  void addCalledMethod(CallGraphNode *M) {
+    CalledMethods.push_back(M);
+  }
+};
+
+
+class CallGraph {
+  Module *Mod;
+  typedef map<const Method *, CallGraphNode *> MethodMapTy;
+  MethodMapTy MethodMap;
+public:
+  CallGraph(Module *TheModule);
+
+  typedef MethodMapTy::iterator iterator;
+  typedef MethodMapTy::const_iterator const_iterator;
+
+  inline const_iterator begin() const { return MethodMap.begin(); }
+  inline const_iterator end()   const { return MethodMap.end();   }
+
+  inline const CallGraphNode *operator[](const Method *M) const {
+    const_iterator I = MethodMap.find(M);
+    assert(I != MethodMap.end() && "Method not in callgraph!");
+    return I->second;
+  }
+
+private:   // Implementation of CallGraph construction
+
+  // getNodeFor - Return the node for the specified method or create one if it
+  // does not already exist.
+  //
+  CallGraphNode *getNodeFor(Method *M);
+
+  // addToCallGraph - Add a method to the call graph, and link the node to all
+  // of the methods that it calls.
+  //
+  void addToCallGraph(Method *M);
+};
+
+
+}  // end namespace cfg
+
+#endif