1 files changed, 118 insertions, 0 deletions
diff --git a/lib/Analysis/DataStructure/DSCallSiteIterator.h b/lib/Analysis/DataStructure/DSCallSiteIterator.h
new file mode 100644
index 0000000000..783bfa58da
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+++ b/lib/Analysis/DataStructure/DSCallSiteIterator.h
@@ -0,0 +1,118 @@
+//===- DSCallSiteIterator.h - Iterator for DSGraph call sites ---*- C++ -*-===//
+//
+// This file implements an iterator for complete call sites in DSGraphs.  This
+// code can either iterator over the normal call list or the aux calls list, and
+// is used by the TD and BU passes.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef DSCALLSITEITERATOR_H
+#define DSCALLSITEITERATOR_H
+
+#include "llvm/Analysis/DSGraph.h"
+#include "llvm/Function.h"
+
+struct DSCallSiteIterator {
+  // FCs are the edges out of the current node are the call site targets...
+  const std::vector<DSCallSite> *FCs;
+  unsigned CallSite;
+  unsigned CallSiteEntry;
+
+  DSCallSiteIterator(const std::vector<DSCallSite> &CS) : FCs(&CS) {
+    CallSite = 0; CallSiteEntry = 0;
+    advanceToValidCallee();
+  }
+
+  // End iterator ctor...
+  DSCallSiteIterator(const std::vector<DSCallSite> &CS, bool) : FCs(&CS) {
+    CallSite = FCs->size(); CallSiteEntry = 0;
+  }
+
+  void advanceToValidCallee() {
+    while (CallSite < FCs->size()) {
+      if ((*FCs)[CallSite].isDirectCall()) {
+        if (CallSiteEntry == 0 &&        // direct call only has one target...
+            (!(*FCs)[CallSite].getCalleeFunc()->isExternal() ||
+             isVAHackFn((*FCs)[CallSite].getCalleeFunc()))) // If not external
+          return;
+      } else {
+        DSNode *CalleeNode = (*FCs)[CallSite].getCalleeNode();
+        if (CallSiteEntry || isCompleteNode(CalleeNode)) {
+          const std::vector<GlobalValue*> &Callees = CalleeNode->getGlobals();
+          
+          if (CallSiteEntry < Callees.size())
+            return;
+        }
+      }
+      CallSiteEntry = 0;
+      ++CallSite;
+    }
+  }
+
+  static bool isVAHackFn(const Function *F) {
+    return F->getName() == "printf"  || F->getName() == "sscanf" ||
+      F->getName() == "fprintf" || F->getName() == "open" ||
+      F->getName() == "sprintf" || F->getName() == "fputs" ||
+      F->getName() == "fscanf";
+  }
+  
+  // isCompleteNode - Return true if we know all of the targets of this node,
+  // and if the call sites are not external.
+  //
+  static inline bool isCompleteNode(DSNode *N) {
+    if (N->isIncomplete()) return false;
+    const std::vector<GlobalValue*> &Callees = N->getGlobals();
+    for (unsigned i = 0, e = Callees.size(); i != e; ++i)
+      if (Callees[i]->isExternal())
+        if (!isVAHackFn(cast<Function>(Callees[i])))
+          return false;  // External function found...
+    return true;  // otherwise ok
+  }
+
+public:
+  static DSCallSiteIterator begin_aux(DSGraph &G) {
+    return G.getAuxFunctionCalls();
+  }
+  static DSCallSiteIterator end_aux(DSGraph &G) {
+    return DSCallSiteIterator(G.getAuxFunctionCalls(), true);
+  }
+  static DSCallSiteIterator begin_std(DSGraph &G) {
+    return G.getFunctionCalls();
+  }
+  static DSCallSiteIterator end_std(DSGraph &G) {
+    return DSCallSiteIterator(G.getFunctionCalls(), true);
+  }
+  static DSCallSiteIterator begin(std::vector<DSCallSite> &CSs) { return CSs; }
+  static DSCallSiteIterator end(std::vector<DSCallSite> &CSs) {
+    return DSCallSiteIterator(CSs, true);
+  }
+  bool operator==(const DSCallSiteIterator &CSI) const {
+    return CallSite == CSI.CallSite && CallSiteEntry == CSI.CallSiteEntry;
+  }
+  bool operator!=(const DSCallSiteIterator &CSI) const {
+    return !operator==(CSI);
+  }
+
+  unsigned getCallSiteIdx() const { return CallSite; }
+  const DSCallSite &getCallSite() const { return (*FCs)[CallSite]; }
+
+  Function *operator*() const {
+    if ((*FCs)[CallSite].isDirectCall()) {
+      return (*FCs)[CallSite].getCalleeFunc();
+    } else {
+      DSNode *Node = (*FCs)[CallSite].getCalleeNode();
+      return cast<Function>(Node->getGlobals()[CallSiteEntry]);
+    }
+  }
+
+  DSCallSiteIterator& operator++() {                // Preincrement
+    ++CallSiteEntry;
+    advanceToValidCallee();
+    return *this;
+  }
+  DSCallSiteIterator operator++(int) { // Postincrement
+    DSCallSiteIterator tmp = *this; ++*this; return tmp; 
+  }
+};
+
+#endif