llvm/lib/Analysis/DataStructure/Printer.cpp - toolchain/llvm-project - Gitiles

 //===- Printer.cpp - Code for printing data structure graphs nicely -------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file was developed by the LLVM research group and is distributed under
 // the University of Illinois Open Source License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the 'dot' graph printer.
 //
 //===----------------------------------------------------------------------===//

 #include "llvm/Analysis/DataStructure/DataStructure.h"
 #include "llvm/Analysis/DataStructure/DSGraph.h"
 #include "llvm/Analysis/DataStructure/DSGraphTraits.h"
 #include "llvm/Module.h"
 #include "llvm/Constants.h"
 #include "llvm/Assembly/Writer.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/GraphWriter.h"
 #include "llvm/ADT/Statistic.h"
 #include <fstream>
 #include <sstream>
 using namespace llvm;

 // OnlyPrintMain - The DataStructure printer exposes this option to allow
 // printing of only the graph for "main".
 //
 namespace {
   cl::opt<bool> OnlyPrintMain("only-print-main-ds", cl::ReallyHidden);
   cl::opt<bool> DontPrintAnything("dont-print-ds", cl::ReallyHidden);
   Statistic<> MaxGraphSize   ("dsa", "Maximum graph size");
   Statistic<> NumFoldedNodes ("dsa", "Number of folded nodes (in final graph)");
 }

 void DSNode::dump() const { print(std::cerr, 0); }

 static std::string getCaption(const DSNode *N, const DSGraph *G) {
   std::stringstream OS;
   Module *M = 0;

   if (!G) G = N->getParentGraph();

   // Get the module from ONE of the functions in the graph it is available.
   if (G && G->retnodes_begin() != G->retnodes_end())
     M = G->retnodes_begin()->first->getParent();
   if (M == 0 && G) {
     // If there is a global in the graph, we can use it to find the module.
     const DSScalarMap &SM = G->getScalarMap();
     if (SM.global_begin() != SM.global_end())
       M = (*SM.global_begin())->getParent();
   }

   if (N->isNodeCompletelyFolded())
     OS << "COLLAPSED";
   else {
     WriteTypeSymbolic(OS, N->getType(), M);
     if (N->isArray())
       OS << " array";
   }
   if (unsigned NodeType = N->getNodeFlags()) {
     OS << ": ";
     if (NodeType & DSNode::AllocaNode ) OS << "S";
     if (NodeType & DSNode::HeapNode   ) OS << "H";
     if (NodeType & DSNode::GlobalNode ) OS << "G";
     if (NodeType & DSNode::UnknownNode) OS << "U";
     if (NodeType & DSNode::Incomplete ) OS << "I";
     if (NodeType & DSNode::Modified   ) OS << "M";
     if (NodeType & DSNode::Read       ) OS << "R";
 #ifndef NDEBUG
     if (NodeType & DSNode::DEAD       ) OS << "<dead>";
 #endif
     OS << "\n";
   }

   EquivalenceClasses<GlobalValue*> *GlobalECs = 0;
   if (G) GlobalECs = &G->getGlobalECs();

   for (unsigned i = 0, e = N->getGlobalsList().size(); i != e; ++i) {
     WriteAsOperand(OS, N->getGlobalsList()[i], false, true, M);

     // Figure out how many globals are equivalent to this one.
     if (GlobalECs) {
       EquivalenceClasses<GlobalValue*>::iterator I =
         GlobalECs->findValue(N->getGlobalsList()[i]);
       if (I != GlobalECs->end()) {
         unsigned NumMembers =
           std::distance(GlobalECs->member_begin(I), GlobalECs->member_end());
         if (NumMembers != 1) OS << " + " << (NumMembers-1) << " EC";
       }
     }
     OS << "\n";
   }

   return OS.str();
 }

 namespace llvm {
 template<>
 struct DOTGraphTraits<const DSGraph*> : public DefaultDOTGraphTraits {
   static std::string getGraphName(const DSGraph *G) {
     switch (G->getReturnNodes().size()) {
     case 0: return G->getFunctionNames();
     case 1: return "Function " + G->getFunctionNames();
     default: return "Functions: " + G->getFunctionNames();
     }
   }

   static std::string getNodeLabel(const DSNode *Node, const DSGraph *Graph) {
     return getCaption(Node, Graph);
   }

   static std::string getNodeAttributes(const DSNode *N) {
     return "shape=Mrecord";
   }

   static bool edgeTargetsEdgeSource(const void *Node,
                                     DSNode::const_iterator I) {
     unsigned O = I.getNode()->getLink(I.getOffset()).getOffset();
     return (O >> DS::PointerShift) != 0;
   }

   static DSNode::const_iterator getEdgeTarget(const DSNode *Node,
                                               DSNode::const_iterator I) {
     unsigned O = I.getNode()->getLink(I.getOffset()).getOffset();
     unsigned LinkNo = O >> DS::PointerShift;
     const DSNode *N = *I;
     DSNode::const_iterator R = N->begin();
     for (; LinkNo; --LinkNo)
       ++R;
     return R;
   }


   /// addCustomGraphFeatures - Use this graph writing hook to emit call nodes
   /// and the return node.
   ///
   static void addCustomGraphFeatures(const DSGraph *G,
                                      GraphWriter<const DSGraph*> &GW) {
     Module *CurMod = 0;
     if (G->retnodes_begin() != G->retnodes_end())
       CurMod = G->retnodes_begin()->first->getParent();
     else {
       // If there is a global in the graph, we can use it to find the module.
       const DSScalarMap &SM = G->getScalarMap();
       if (SM.global_begin() != SM.global_end())
         CurMod = (*SM.global_begin())->getParent();
     }


     // Add scalar nodes to the graph...
     const DSGraph::ScalarMapTy &VM = G->getScalarMap();
     for (DSGraph::ScalarMapTy::const_iterator I = VM.begin(); I != VM.end();++I)
       if (!isa<GlobalValue>(I->first)) {
         std::stringstream OS;
         WriteAsOperand(OS, I->first, false, true, CurMod);
         GW.emitSimpleNode(I->first, "", OS.str());

         // Add edge from return node to real destination
         DSNode *DestNode = I->second.getNode();
         int EdgeDest = I->second.getOffset() >> DS::PointerShift;
         if (EdgeDest == 0) EdgeDest = -1;
         GW.emitEdge(I->first, -1, DestNode,
                     EdgeDest, "arrowtail=tee,color=gray63");
       }


     // Output the returned value pointer...
     for (DSGraph::retnodes_iterator I = G->retnodes_begin(),
            E = G->retnodes_end(); I != E; ++I)
       if (I->second.getNode()) {
         std::string Label;
         if (G->getReturnNodes().size() == 1)
           Label = "returning";
         else
           Label = I->first->getName() + " ret node";
         // Output the return node...
         GW.emitSimpleNode((void*)I->first, "plaintext=circle", Label);

         // Add edge from return node to real destination
         DSNode *RetNode = I->second.getNode();
         int RetEdgeDest = I->second.getOffset() >> DS::PointerShift;;
         if (RetEdgeDest == 0) RetEdgeDest = -1;
         GW.emitEdge((void*)I->first, -1, RetNode,
                     RetEdgeDest, "arrowtail=tee,color=gray63");
       }

     // Output all of the call nodes...
     const std::list<DSCallSite> &FCs =
       G->shouldPrintAuxCalls() ? G->getAuxFunctionCalls()
       : G->getFunctionCalls();
     for (std::list<DSCallSite>::const_iterator I = FCs.begin(), E = FCs.end();
          I != E; ++I) {
       const DSCallSite &Call = *I;
       std::vector<std::string> EdgeSourceCaptions(Call.getNumPtrArgs()+2);
       EdgeSourceCaptions[0] = "r";
       if (Call.isDirectCall())
         EdgeSourceCaptions[1] = Call.getCalleeFunc()->getName();
       else
         EdgeSourceCaptions[1] = "f";

       GW.emitSimpleNode(&Call, "shape=record", "call", Call.getNumPtrArgs()+2,
                         &EdgeSourceCaptions);

       if (DSNode *N = Call.getRetVal().getNode()) {
         int EdgeDest = Call.getRetVal().getOffset() >> DS::PointerShift;
         if (EdgeDest == 0) EdgeDest = -1;
         GW.emitEdge(&Call, 0, N, EdgeDest, "color=gray63,tailclip=false");
       }

       // Print out the callee...
       if (Call.isIndirectCall()) {
         DSNode *N = Call.getCalleeNode();
         assert(N && "Null call site callee node!");
         GW.emitEdge(&Call, 1, N, -1, "color=gray63,tailclip=false");
       }

       for (unsigned j = 0, e = Call.getNumPtrArgs(); j != e; ++j)
         if (DSNode *N = Call.getPtrArg(j).getNode()) {
           int EdgeDest = Call.getPtrArg(j).getOffset() >> DS::PointerShift;
           if (EdgeDest == 0) EdgeDest = -1;
           GW.emitEdge(&Call, j+2, N, EdgeDest, "color=gray63,tailclip=false");
         }
     }
   }
 };
 }   // end namespace llvm

 void DSNode::print(std::ostream &O, const DSGraph *G) const {
   GraphWriter<const DSGraph *> W(O, G);
   W.writeNode(this);
 }

 void DSGraph::print(std::ostream &O) const {
   WriteGraph(O, this, "DataStructures");
 }

 void DSGraph::writeGraphToFile(std::ostream &O,
                                const std::string &GraphName) const {
   std::string Filename = GraphName + ".dot";
   O << "Writing '" << Filename << "'...";
   std::ofstream F(Filename.c_str());

   if (F.good()) {
     print(F);
     unsigned NumCalls = shouldPrintAuxCalls() ?
       getAuxFunctionCalls().size() : getFunctionCalls().size();
     O << " [" << getGraphSize() << "+" << NumCalls << "]\n";
   } else {
     O << "  error opening file for writing!\n";
   }
 }

 /// viewGraph - Emit a dot graph, run 'dot', run gv on the postscript file,
 /// then cleanup.  For use from the debugger.
 ///
 void DSGraph::viewGraph() const {
   std::ofstream F("/tmp/tempgraph.dot");
   if (!F.good()) {
     std::cerr << "Error opening '/tmp/tempgraph.dot' for temporary graph!\n";
     return;
   }
   print(F);
   F.close();
   if (system("dot -Tps -Gsize=10,7.5 -Grotate=90 /tmp/tempgraph.dot > /tmp/tempgraph.ps"))
     std::cerr << "Error running dot: 'dot' not in path?\n";
   system("gv /tmp/tempgraph.ps");
   system("rm /tmp/tempgraph.dot /tmp/tempgraph.ps");
 }


 template <typename Collection>
 static void printCollection(const Collection &C, std::ostream &O,
                             const Module *M, const std::string &Prefix) {
   if (M == 0) {
     O << "Null Module pointer, cannot continue!\n";
     return;
   }

   unsigned TotalNumNodes = 0, TotalCallNodes = 0;
   for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
     if (C.hasGraph(*I)) {
       DSGraph &Gr = C.getDSGraph((Function&)*I);
       unsigned NumCalls = Gr.shouldPrintAuxCalls() ?
         Gr.getAuxFunctionCalls().size() : Gr.getFunctionCalls().size();
       bool IsDuplicateGraph = false;

       if (I->getName() == "main" || !OnlyPrintMain) {
         Function *SCCFn = Gr.retnodes_begin()->first;
         if (&*I == SCCFn) {
           Gr.writeGraphToFile(O, Prefix+I->getName());
         } else {
           IsDuplicateGraph = true; // Don't double count node/call nodes.
           O << "Didn't write '" << Prefix+I->getName()
             << ".dot' - Graph already emitted to '" << Prefix+SCCFn->getName()
             << "\n";
         }
       } else {
         Function *SCCFn = Gr.retnodes_begin()->first;
         if (&*I == SCCFn) {
           O << "Skipped Writing '" << Prefix+I->getName() << ".dot'... ["
             << Gr.getGraphSize() << "+" << NumCalls << "]\n";
         } else {
           IsDuplicateGraph = true; // Don't double count node/call nodes.
         }
       }

       if (!IsDuplicateGraph) {
         unsigned GraphSize = Gr.getGraphSize();
         if (MaxGraphSize < GraphSize) MaxGraphSize = GraphSize;

         TotalNumNodes += Gr.getGraphSize();
         TotalCallNodes += NumCalls;
         for (DSGraph::node_iterator NI = Gr.node_begin(), E = Gr.node_end();
              NI != E; ++NI)
           if (NI->isNodeCompletelyFolded())
             ++NumFoldedNodes;
       }
     }

   DSGraph &GG = C.getGlobalsGraph();
   TotalNumNodes  += GG.getGraphSize();
   TotalCallNodes += GG.getFunctionCalls().size();
   if (!OnlyPrintMain) {
     GG.writeGraphToFile(O, Prefix+"GlobalsGraph");
   } else {
     O << "Skipped Writing '" << Prefix << "GlobalsGraph.dot'... ["
       << GG.getGraphSize() << "+" << GG.getFunctionCalls().size() << "]\n";
   }

   O << "\nGraphs contain [" << TotalNumNodes << "+" << TotalCallNodes
     << "] nodes total" << std::endl;
 }


 // print - Print out the analysis results...
 void LocalDataStructures::print(std::ostream &O, const Module *M) const {
   if (DontPrintAnything) return;
   printCollection(*this, O, M, "ds.");
 }

 void BUDataStructures::print(std::ostream &O, const Module *M) const {
   if (DontPrintAnything) return;
   printCollection(*this, O, M, "bu.");
 }

 void TDDataStructures::print(std::ostream &O, const Module *M) const {
   if (DontPrintAnything) return;
   printCollection(*this, O, M, "td.");
 }

 void CompleteBUDataStructures::print(std::ostream &O, const Module *M) const {
   if (DontPrintAnything) return;
   printCollection(*this, O, M, "cbu.");
 }


 void EquivClassGraphs::print(std::ostream &O, const Module *M) const {
   if (DontPrintAnything) return;
   printCollection(*this, O, M, "eq.");
 }
	//===- Printer.cpp - Code for printing data structure graphs nicely -------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file was developed by the LLVM research group and is distributed under
	// the University of Illinois Open Source License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file implements the 'dot' graph printer.
	//
	//===----------------------------------------------------------------------===//

	#include "llvm/Analysis/DataStructure/DataStructure.h"
	#include "llvm/Analysis/DataStructure/DSGraph.h"
	#include "llvm/Analysis/DataStructure/DSGraphTraits.h"
	#include "llvm/Module.h"
	#include "llvm/Constants.h"
	#include "llvm/Assembly/Writer.h"
	#include "llvm/Support/CommandLine.h"
	#include "llvm/Support/GraphWriter.h"
	#include "llvm/ADT/Statistic.h"
	#include <fstream>
	#include <sstream>
	using namespace llvm;

	// OnlyPrintMain - The DataStructure printer exposes this option to allow
	// printing of only the graph for "main".
	//
	namespace {
	cl::opt<bool> OnlyPrintMain("only-print-main-ds", cl::ReallyHidden);
	cl::opt<bool> DontPrintAnything("dont-print-ds", cl::ReallyHidden);
	Statistic<> MaxGraphSize ("dsa", "Maximum graph size");
	Statistic<> NumFoldedNodes ("dsa", "Number of folded nodes (in final graph)");
	}

	void DSNode::dump() const { print(std::cerr, 0); }

	static std::string getCaption(const DSNode N, const DSGraph G) {
	std::stringstream OS;
	Module *M = 0;

	if (!G) G = N->getParentGraph();

	// Get the module from ONE of the functions in the graph it is available.
	if (G && G->retnodes_begin() != G->retnodes_end())
	M = G->retnodes_begin()->first->getParent();
	if (M == 0 && G) {
	// If there is a global in the graph, we can use it to find the module.
	const DSScalarMap &SM = G->getScalarMap();
	if (SM.global_begin() != SM.global_end())
	M = (*SM.global_begin())->getParent();
	}

	if (N->isNodeCompletelyFolded())
	OS << "COLLAPSED";
	else {
	WriteTypeSymbolic(OS, N->getType(), M);
	if (N->isArray())
	OS << " array";
	}
	if (unsigned NodeType = N->getNodeFlags()) {
	OS << ": ";
	if (NodeType & DSNode::AllocaNode ) OS << "S";
	if (NodeType & DSNode::HeapNode ) OS << "H";
	if (NodeType & DSNode::GlobalNode ) OS << "G";
	if (NodeType & DSNode::UnknownNode) OS << "U";
	if (NodeType & DSNode::Incomplete ) OS << "I";
	if (NodeType & DSNode::Modified ) OS << "M";
	if (NodeType & DSNode::Read ) OS << "R";
	#ifndef NDEBUG
	if (NodeType & DSNode::DEAD ) OS << "<dead>";
	#endif
	OS << "\n";
	}

	EquivalenceClasses<GlobalValue> GlobalECs = 0;
	if (G) GlobalECs = &G->getGlobalECs();

	for (unsigned i = 0, e = N->getGlobalsList().size(); i != e; ++i) {
	WriteAsOperand(OS, N->getGlobalsList()[i], false, true, M);

	// Figure out how many globals are equivalent to this one.
	if (GlobalECs) {
	EquivalenceClasses<GlobalValue*>::iterator I =
	GlobalECs->findValue(N->getGlobalsList()[i]);
	if (I != GlobalECs->end()) {
	unsigned NumMembers =
	std::distance(GlobalECs->member_begin(I), GlobalECs->member_end());
	if (NumMembers != 1) OS << " + " << (NumMembers-1) << " EC";
	}
	}
	OS << "\n";
	}

	return OS.str();
	}

	namespace llvm {
	template<>
	struct DOTGraphTraits<const DSGraph*> : public DefaultDOTGraphTraits {
	static std::string getGraphName(const DSGraph *G) {
	switch (G->getReturnNodes().size()) {
	case 0: return G->getFunctionNames();
	case 1: return "Function " + G->getFunctionNames();
	default: return "Functions: " + G->getFunctionNames();
	}
	}

	static std::string getNodeLabel(const DSNode Node, const DSGraph Graph) {
	return getCaption(Node, Graph);
	}

	static std::string getNodeAttributes(const DSNode *N) {
	return "shape=Mrecord";
	}

	static bool edgeTargetsEdgeSource(const void *Node,
	DSNode::const_iterator I) {
	unsigned O = I.getNode()->getLink(I.getOffset()).getOffset();
	return (O >> DS::PointerShift) != 0;
	}

	static DSNode::const_iterator getEdgeTarget(const DSNode *Node,
	DSNode::const_iterator I) {
	unsigned O = I.getNode()->getLink(I.getOffset()).getOffset();
	unsigned LinkNo = O >> DS::PointerShift;
	const DSNode N = I;
	DSNode::const_iterator R = N->begin();
	for (; LinkNo; --LinkNo)
	++R;
	return R;
	}


	/// addCustomGraphFeatures - Use this graph writing hook to emit call nodes
	/// and the return node.
	///
	static void addCustomGraphFeatures(const DSGraph *G,
	GraphWriter<const DSGraph*> &GW) {
	Module *CurMod = 0;
	if (G->retnodes_begin() != G->retnodes_end())
	CurMod = G->retnodes_begin()->first->getParent();
	else {
	// If there is a global in the graph, we can use it to find the module.
	const DSScalarMap &SM = G->getScalarMap();
	if (SM.global_begin() != SM.global_end())
	CurMod = (*SM.global_begin())->getParent();
	}


	// Add scalar nodes to the graph...
	const DSGraph::ScalarMapTy &VM = G->getScalarMap();
	for (DSGraph::ScalarMapTy::const_iterator I = VM.begin(); I != VM.end();++I)
	if (!isa<GlobalValue>(I->first)) {
	std::stringstream OS;
	WriteAsOperand(OS, I->first, false, true, CurMod);
	GW.emitSimpleNode(I->first, "", OS.str());

	// Add edge from return node to real destination
	DSNode *DestNode = I->second.getNode();
	int EdgeDest = I->second.getOffset() >> DS::PointerShift;
	if (EdgeDest == 0) EdgeDest = -1;
	GW.emitEdge(I->first, -1, DestNode,
	EdgeDest, "arrowtail=tee,color=gray63");
	}


	// Output the returned value pointer...
	for (DSGraph::retnodes_iterator I = G->retnodes_begin(),
	E = G->retnodes_end(); I != E; ++I)
	if (I->second.getNode()) {
	std::string Label;
	if (G->getReturnNodes().size() == 1)
	Label = "returning";
	else
	Label = I->first->getName() + " ret node";
	// Output the return node...
	GW.emitSimpleNode((void*)I->first, "plaintext=circle", Label);

	// Add edge from return node to real destination
	DSNode *RetNode = I->second.getNode();
	int RetEdgeDest = I->second.getOffset() >> DS::PointerShift;;
	if (RetEdgeDest == 0) RetEdgeDest = -1;
	GW.emitEdge((void*)I->first, -1, RetNode,
	RetEdgeDest, "arrowtail=tee,color=gray63");
	}

	// Output all of the call nodes...
	const std::list<DSCallSite> &FCs =
	G->shouldPrintAuxCalls() ? G->getAuxFunctionCalls()
	: G->getFunctionCalls();
	for (std::list<DSCallSite>::const_iterator I = FCs.begin(), E = FCs.end();
	I != E; ++I) {
	const DSCallSite &Call = *I;
	std::vector<std::string> EdgeSourceCaptions(Call.getNumPtrArgs()+2);
	EdgeSourceCaptions[0] = "r";
	if (Call.isDirectCall())
	EdgeSourceCaptions[1] = Call.getCalleeFunc()->getName();
	else
	EdgeSourceCaptions[1] = "f";

	GW.emitSimpleNode(&Call, "shape=record", "call", Call.getNumPtrArgs()+2,
	&EdgeSourceCaptions);

	if (DSNode *N = Call.getRetVal().getNode()) {
	int EdgeDest = Call.getRetVal().getOffset() >> DS::PointerShift;
	if (EdgeDest == 0) EdgeDest = -1;
	GW.emitEdge(&Call, 0, N, EdgeDest, "color=gray63,tailclip=false");
	}

	// Print out the callee...
	if (Call.isIndirectCall()) {
	DSNode *N = Call.getCalleeNode();
	assert(N && "Null call site callee node!");
	GW.emitEdge(&Call, 1, N, -1, "color=gray63,tailclip=false");
	}

	for (unsigned j = 0, e = Call.getNumPtrArgs(); j != e; ++j)
	if (DSNode *N = Call.getPtrArg(j).getNode()) {
	int EdgeDest = Call.getPtrArg(j).getOffset() >> DS::PointerShift;
	if (EdgeDest == 0) EdgeDest = -1;
	GW.emitEdge(&Call, j+2, N, EdgeDest, "color=gray63,tailclip=false");
	}
	}
	}
	};
	} // end namespace llvm

	void DSNode::print(std::ostream &O, const DSGraph *G) const {
	GraphWriter<const DSGraph *> W(O, G);
	W.writeNode(this);
	}

	void DSGraph::print(std::ostream &O) const {
	WriteGraph(O, this, "DataStructures");
	}

	void DSGraph::writeGraphToFile(std::ostream &O,
	const std::string &GraphName) const {
	std::string Filename = GraphName + ".dot";
	O << "Writing '" << Filename << "'...";
	std::ofstream F(Filename.c_str());

	if (F.good()) {
	print(F);
	unsigned NumCalls = shouldPrintAuxCalls() ?
	getAuxFunctionCalls().size() : getFunctionCalls().size();
	O << " [" << getGraphSize() << "+" << NumCalls << "]\n";
	} else {
	O << " error opening file for writing!\n";
	}
	}

	/// viewGraph - Emit a dot graph, run 'dot', run gv on the postscript file,
	/// then cleanup. For use from the debugger.
	///
	void DSGraph::viewGraph() const {
	std::ofstream F("/tmp/tempgraph.dot");
	if (!F.good()) {
	std::cerr << "Error opening '/tmp/tempgraph.dot' for temporary graph!\n";
	return;
	}
	print(F);
	F.close();
	if (system("dot -Tps -Gsize=10,7.5 -Grotate=90 /tmp/tempgraph.dot > /tmp/tempgraph.ps"))
	std::cerr << "Error running dot: 'dot' not in path?\n";
	system("gv /tmp/tempgraph.ps");
	system("rm /tmp/tempgraph.dot /tmp/tempgraph.ps");
	}


	template <typename Collection>
	static void printCollection(const Collection &C, std::ostream &O,
	const Module *M, const std::string &Prefix) {
	if (M == 0) {
	O << "Null Module pointer, cannot continue!\n";
	return;
	}

	unsigned TotalNumNodes = 0, TotalCallNodes = 0;
	for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
	if (C.hasGraph(*I)) {
	DSGraph &Gr = C.getDSGraph((Function&)*I);
	unsigned NumCalls = Gr.shouldPrintAuxCalls() ?
	Gr.getAuxFunctionCalls().size() : Gr.getFunctionCalls().size();
	bool IsDuplicateGraph = false;

	if (I->getName() == "main" \|\| !OnlyPrintMain) {
	Function *SCCFn = Gr.retnodes_begin()->first;
	if (&*I == SCCFn) {
	Gr.writeGraphToFile(O, Prefix+I->getName());
	} else {
	IsDuplicateGraph = true; // Don't double count node/call nodes.
	O << "Didn't write '" << Prefix+I->getName()
	<< ".dot' - Graph already emitted to '" << Prefix+SCCFn->getName()
	<< "\n";
	}
	} else {
	Function *SCCFn = Gr.retnodes_begin()->first;
	if (&*I == SCCFn) {
	O << "Skipped Writing '" << Prefix+I->getName() << ".dot'... ["
	<< Gr.getGraphSize() << "+" << NumCalls << "]\n";
	} else {
	IsDuplicateGraph = true; // Don't double count node/call nodes.
	}
	}

	if (!IsDuplicateGraph) {
	unsigned GraphSize = Gr.getGraphSize();
	if (MaxGraphSize < GraphSize) MaxGraphSize = GraphSize;

	TotalNumNodes += Gr.getGraphSize();
	TotalCallNodes += NumCalls;
	for (DSGraph::node_iterator NI = Gr.node_begin(), E = Gr.node_end();
	NI != E; ++NI)
	if (NI->isNodeCompletelyFolded())
	++NumFoldedNodes;
	}
	}

	DSGraph &GG = C.getGlobalsGraph();
	TotalNumNodes += GG.getGraphSize();
	TotalCallNodes += GG.getFunctionCalls().size();
	if (!OnlyPrintMain) {
	GG.writeGraphToFile(O, Prefix+"GlobalsGraph");
	} else {
	O << "Skipped Writing '" << Prefix << "GlobalsGraph.dot'... ["
	<< GG.getGraphSize() << "+" << GG.getFunctionCalls().size() << "]\n";
	}

	O << "\nGraphs contain [" << TotalNumNodes << "+" << TotalCallNodes
	<< "] nodes total" << std::endl;
	}


	// print - Print out the analysis results...
	void LocalDataStructures::print(std::ostream &O, const Module *M) const {
	if (DontPrintAnything) return;
	printCollection(*this, O, M, "ds.");
	}

	void BUDataStructures::print(std::ostream &O, const Module *M) const {
	if (DontPrintAnything) return;
	printCollection(*this, O, M, "bu.");
	}

	void TDDataStructures::print(std::ostream &O, const Module *M) const {
	if (DontPrintAnything) return;
	printCollection(*this, O, M, "td.");
	}

	void CompleteBUDataStructures::print(std::ostream &O, const Module *M) const {
	if (DontPrintAnything) return;
	printCollection(*this, O, M, "cbu.");
	}


	void EquivClassGraphs::print(std::ostream &O, const Module *M) const {
	if (DontPrintAnything) return;
	printCollection(*this, O, M, "eq.");
	}