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//===- 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...
! DSCallSite::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
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