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

lib/Analysis/IPA/CallGraph.cpp

@@ -0,0 +1,66 @@
+//===- CallGraph.cpp - Build a Module's call graph --------------------------=//
+//
+// This file implements call graph construction (from a module), and will
+// eventually implement call graph serialization and deserialization for
+// annotation support.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/CallGraph.h"
+#include "llvm/Analysis/Writer.h"
+#include "llvm/Support/STLExtras.h"
+#include "llvm/Module.h"
+#include "llvm/Method.h"
+#include "llvm/iOther.h"
+#include <algorithm>
+
+using namespace cfg;
+
+// getNodeFor - Return the node for the specified method or create one if it
+// does not already exist.
+//
+CallGraphNode *CallGraph::getNodeFor(Method *M) {
+  iterator I = MethodMap.find(M);
+  if (I != MethodMap.end()) return I->second;
+
+  assert(M->getParent() == Mod && "Method not in current module!");
+  CallGraphNode *New = new CallGraphNode(M);
+
+  MethodMap.insert(pair<const Method*, CallGraphNode*>(M, New));
+  return New;
+}
+
+// addToCallGraph - Add a method to the call graph, and link the node to all of
+// the methods that it calls.
+//
+void CallGraph::addToCallGraph(Method *M) {
+  CallGraphNode *Node = getNodeFor(M);
+
+  for (Method::inst_iterator II = M->inst_begin(), IE = M->inst_end();
+       II != IE; ++II) {
+    if (II->getOpcode() == Instruction::Call) {
+      CallInst *CI = (CallInst*)*II;
+      Node->addCalledMethod(getNodeFor(CI->getCalledMethod()));
+    }
+  }
+}
+
+CallGraph::CallGraph(Module *TheModule) {
+  Mod = TheModule;
+
+  // Add every method to the call graph...
+  for_each(Mod->begin(), Mod->end(), bind_obj(this,&CallGraph::addToCallGraph));
+}
+
+
+void cfg::WriteToOutput(const CallGraphNode *CGN, ostream &o) {
+  o << "Call graph node for method: '" << CGN->getMethod()->getName() << "'\n";
+  for (unsigned i = 0; i < CGN->size(); ++i)
+    o << "  Calls method '" << (*CGN)[i]->getMethod()->getName() << "'\n";
+  o << endl;
+}
+
+void cfg::WriteToOutput(const CallGraph &CG, ostream &o) {
+  for (CallGraph::const_iterator I = CG.begin(), E = CG.end(); I != E; ++I)
+    o << I->second;
+}