Split CallSiteIterator out into DSCallSiteIterator.h, and generalize it a bit
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7006 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/DataStructure/DSCallSiteIterator.h b/lib/Analysis/DataStructure/DSCallSiteIterator.h
new file mode 100644
index 0000000..783bfa5
--- /dev/null
+++ 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