| //===- 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; |
| } |
| |
| 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" || F->getName() == "bzero" || |
| F->getName() == "memset"; |
| } |
| |
| // isUnresolvableFunction - Return true if this is an unresolvable |
| // external function. A direct or indirect call to this cannot be resolved. |
| // |
| static bool isUnresolvableFunc(const Function* callee) { |
| return callee->isExternal() && !isVAHackFn(callee); |
| } |
| |
| void advanceToValidCallee() { |
| while (CallSite < FCs->size()) { |
| if ((*FCs)[CallSite].isDirectCall()) { |
| if (CallSiteEntry == 0 && // direct call only has one target... |
| ! isUnresolvableFunc((*FCs)[CallSite].getCalleeFunc())) |
| return; // and not an unresolvable external func |
| } else { |
| DSNode *CalleeNode = (*FCs)[CallSite].getCalleeNode(); |
| if (CallSiteEntry || isCompleteNode(CalleeNode)) { |
| const std::vector<GlobalValue*> &Callees = CalleeNode->getGlobals(); |
| while (CallSiteEntry < Callees.size()) { |
| if (isa<Function>(Callees[CallSiteEntry])) |
| return; |
| ++CallSiteEntry; |
| } |
| } |
| } |
| CallSiteEntry = 0; |
| ++CallSite; |
| } |
| } |
| |
| // 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 (isUnresolvableFunc(cast<Function>(Callees[i]))) |
| return false; // Unresolvable 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 |