llvm/lib/Transforms/Instrumentation/ProfilePaths/GraphAuxiliary.cpp

//===-- GrapAuxillary.cpp- Auxillary functions on graph ----------*- C++ -*--=//
//
//auxillary function associated with graph: they
//all operate on graph, and help in inserting
//instrumentation for trace generation
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
#include "llvm/Function.h"
#include "llvm/Pass.h"
#include "llvm/BasicBlock.h"
#include "llvm/Transforms/Instrumentation/Graph.h"
#include <algorithm>
#include <iostream>

//using std::list;
using std::map;
using std::vector;
using std::cerr;

//check if 2 edges are equal (same endpoints and same weight)
static bool edgesEqual(Edge  ed1, Edge ed2){
  return ((ed1==ed2) && ed1.getWeight()==ed2.getWeight());
}

//Get the vector of edges that are to be instrumented in the graph
static void getChords(vector<Edge > &chords, Graph &g, Graph st){
  //make sure the spanning tree is directional
  //iterate over ALL the edges of the graph
  vector<Node *> allNodes=g.getAllNodes();
  for(vector<Node *>::iterator NI=allNodes.begin(), NE=allNodes.end(); NI!=NE; 
      ++NI){
    Graph::nodeList node_list=g.getNodeList(*NI);
    for(Graph::nodeList::iterator NLI=node_list.begin(), NLE=node_list.end(); 
	NLI!=NLE; ++NLI){
      Edge f(*NI, NLI->element,NLI->weight, NLI->randId);
      if(!(st.hasEdgeAndWt(f)))//addnl
	chords.push_back(f);
    }
  }
}

//Given a tree t, and a "directed graph" g
//replace the edges in the tree t with edges that exist in graph
//The tree is formed from "undirectional" copy of graph
//So whatever edges the tree has, the undirectional graph 
//would have too. This function corrects some of the directions in 
//the tree so that now, all edge directions in the tree match
//the edge directions of corresponding edges in the directed graph
static void removeTreeEdges(Graph &g, Graph& t){
  vector<Node* > allNodes=t.getAllNodes();
  for(vector<Node *>::iterator NI=allNodes.begin(), NE=allNodes.end(); NI!=NE; 
      ++NI){
    Graph::nodeList nl=t.getNodeList(*NI);
    for(Graph::nodeList::iterator NLI=nl.begin(), NLE=nl.end();	NLI!=NLE;++NLI){
      Edge ed(NLI->element, *NI, NLI->weight);
      //if(!g.hasEdge(ed)) t.removeEdge(ed);
      if(!g.hasEdgeAndWt(ed)) t.removeEdge(ed);//tree has only one edge
      //between any pair of vertices, so no need to delete by edge wt
    }
  }
}

//Assign a value to all the edges in the graph
//such that if we traverse along any path from root to exit, and
//add up the edge values, we get a path number that uniquely
//refers to the path we travelled
int valueAssignmentToEdges(Graph& g){
  vector<Node *> revtop=g.reverseTopologicalSort();
  /*
  std::cerr<<"-----------Reverse topological sort\n";
  for(vector<Node *>::iterator RI=revtop.begin(), RE=revtop.end(); RI!=RE; ++RI){
    std::cerr<<(*RI)->getElement()->getName()<<":";
  }
  std::cerr<<"\n----------------------"<<std::endl;
  */
  map<Node *,int > NumPaths;
  for(vector<Node *>::iterator RI=revtop.begin(), RE=revtop.end(); RI!=RE; ++RI){
    if(g.isLeaf(*RI))
      NumPaths[*RI]=1;
    else{
      NumPaths[*RI]=0;
      /////
      Graph::nodeList &nlist=g.getNodeList(*RI);
      //sort nodelist by increasing order of numpaths
      
      int sz=nlist.size();
      for(int i=0;i<sz-1; i++){
	int min=i;
	for(int j=i+1; j<sz; j++)
	  if(NumPaths[nlist[j].element]<NumPaths[nlist[min].element]) min=j;
	
	graphListElement tempEl=nlist[min];
	nlist[min]=nlist[i];
	nlist[i]=tempEl;
      }
      //sorted now!

      for(Graph::nodeList::iterator GLI=nlist.begin(), GLE=nlist.end();
	  GLI!=GLE; ++GLI){
	GLI->weight=NumPaths[*RI];
	NumPaths[*RI]+=NumPaths[GLI->element];
      }
    }
  }
  return NumPaths[g.getRoot()];
}

//This is a helper function to get the edge increments
//This is used in conjuntion with inc_DFS
//to get the edge increments
//Edge increment implies assigning a value to all the edges in the graph
//such that if we traverse along any path from root to exit, and
//add up the edge values, we get a path number that uniquely
//refers to the path we travelled
//inc_Dir tells whether 2 edges are in same, or in different directions
//if same direction, return 1, else -1
static int inc_Dir(Edge e, Edge f){ 
 if(e.isNull()) 
    return 1;
 
 //check that the edges must have atleast one common endpoint
  assert(*(e.getFirst())==*(f.getFirst()) ||
	 *(e.getFirst())==*(f.getSecond()) || 
	 *(e.getSecond())==*(f.getFirst()) ||
	 *(e.getSecond())==*(f.getSecond()));

  if(*(e.getFirst())==*(f.getSecond()) || 
     *(e.getSecond())==*(f.getFirst()))
    return 1;
  
  return -1;
}


//used for getting edge increments (read comments above in inc_Dir)
//inc_DFS is a modification of DFS 
static void inc_DFS(Graph& g,Graph& t,map<Edge, int, EdgeCompare>& Increment, 
	     int events, Node *v, Edge e){
  
  vector<Node *> allNodes=t.getAllNodes();


  //cerr<<"Called for\n";
  //if(!e.isNull())
  //printEdge(e);


  for(vector<Node *>::iterator NI=allNodes.begin(), NE=allNodes.end(); NI!=NE; 
      ++NI){
    Graph::nodeList node_list=t.getNodeList(*NI);
    for(Graph::nodeList::iterator NLI=node_list.begin(), NLE=node_list.end(); 
	NLI!= NLE; ++NLI){
      Edge f(*NI, NLI->element,NLI->weight, NLI->randId);
      if(!edgesEqual(f,e) && *v==*(f.getSecond())){
	int dir_count=inc_Dir(e,f);
	int wt=1*f.getWeight();
	inc_DFS(g,t, Increment, dir_count*events+wt, f.getFirst(), f);
      }
    }
  }

  for(vector<Node *>::iterator NI=allNodes.begin(), NE=allNodes.end(); NI!=NE; 
      ++NI){
    Graph::nodeList node_list=t.getNodeList(*NI);
    for(Graph::nodeList::iterator NLI=node_list.begin(), NLE=node_list.end(); 
	NLI!=NLE; ++NLI){
      Edge f(*NI, NLI->element,NLI->weight, NLI->randId);
      if(!edgesEqual(f,e) && *v==*(f.getFirst())){
      	int dir_count=inc_Dir(e,f);
	int wt=f.getWeight();
	inc_DFS(g,t, Increment, dir_count*events+wt, 
		f.getSecond(), f);
      }
    }
  }

  allNodes=g.getAllNodes();
  for(vector<Node *>::iterator NI=allNodes.begin(), NE=allNodes.end(); NI!=NE; 
      ++NI){
    Graph::nodeList node_list=g.getNodeList(*NI);
    for(Graph::nodeList::iterator NLI=node_list.begin(), NLE=node_list.end(); 
	NLI!=NLE; ++NLI){
      Edge f(*NI, NLI->element,NLI->weight, NLI->randId);
      if(!(t.hasEdgeAndWt(f)) && (*v==*(f.getSecond()) || 
				  *v==*(f.getFirst()))){
	int dir_count=inc_Dir(e,f);
	Increment[f]+=dir_count*events;
	//cerr<<"assigned "<<Increment[f]<<" to"<<endl;
	//printEdge(f);
      }
    }
  }
}

//Now we select a subset of all edges
//and assign them some values such that 
//if we consider just this subset, it still represents
//the path sum along any path in the graph
static map<Edge, int, EdgeCompare> getEdgeIncrements(Graph& g, Graph& t){
  //get all edges in g-t
  map<Edge, int, EdgeCompare> Increment;

  vector<Node *> allNodes=g.getAllNodes();
 
  for(vector<Node *>::iterator NI=allNodes.begin(), NE=allNodes.end(); NI!=NE; 
      ++NI){
    Graph::nodeList node_list=g.getNodeList(*NI);
    for(Graph::nodeList::iterator NLI=node_list.begin(), NLE=node_list.end(); 
	NLI!=NLE; ++NLI){
      Edge ed(*NI, NLI->element,NLI->weight,NLI->randId);
      if(!(t.hasEdgeAndWt(ed))){
	Increment[ed]=0;;
      }
    }
  }

  Edge *ed=new Edge();
  inc_DFS(g,t,Increment, 0, g.getRoot(), *ed);

  for(vector<Node *>::iterator NI=allNodes.begin(), NE=allNodes.end(); NI!=NE; 
      ++NI){
    Graph::nodeList node_list=g.getNodeList(*NI);
    for(Graph::nodeList::iterator NLI=node_list.begin(), NLE=node_list.end(); 
	NLI!=NLE; ++NLI){
      Edge ed(*NI, NLI->element,NLI->weight, NLI->randId);
      if(!(t.hasEdgeAndWt(ed))){
	int wt=ed.getWeight();
	Increment[ed]+=wt;
      }
    }
  }

  return Increment;
}

//push it up: TODO
const graphListElement *findNodeInList(const Graph::nodeList &NL,
					      Node *N);

graphListElement *findNodeInList(Graph::nodeList &NL, Node *N);
//end TODO

//Based on edgeIncrements (above), now obtain
//the kind of code to be inserted along an edge
//The idea here is to minimize the computation
//by inserting only the needed code
static void getCodeInsertions(Graph &g, map<Edge, getEdgeCode *, EdgeCompare> &instr,
                              vector<Edge > &chords, 
                              map<Edge,int, EdgeCompare> &edIncrements){

  //Register initialization code
  vector<Node *> ws;
  ws.push_back(g.getRoot());
  while(ws.size()>0){
    Node *v=ws.back();
    ws.pop_back();
    //for each edge v->w
    Graph::nodeList succs=g.getNodeList(v);
    
    for(Graph::nodeList::iterator nl=succs.begin(), ne=succs.end();
	nl!=ne; ++nl){
      int edgeWt=nl->weight;
      Node *w=nl->element;
      //if chords has v->w
      Edge ed(v,w, edgeWt, nl->randId);
      //cerr<<"Assign:\n";
      //printEdge(ed);
      bool hasEdge=false;
      for(vector<Edge>::iterator CI=chords.begin(), CE=chords.end();
	  CI!=CE && !hasEdge;++CI){
	if(*CI==ed && CI->getWeight()==edgeWt){//modf
	  hasEdge=true;
	}
      }

      if(hasEdge){//so its a chord edge
	getEdgeCode *edCd=new getEdgeCode();
	edCd->setCond(1);
	edCd->setInc(edIncrements[ed]);
	instr[ed]=edCd;
	//std::cerr<<"Case 1\n";
      }
      else if(g.getNumberOfIncomingEdges(w)==1){
	ws.push_back(w);
	//std::cerr<<"Added w\n";
      }
      else{
	getEdgeCode *edCd=new getEdgeCode();
	edCd->setCond(2);
	edCd->setInc(0);
	instr[ed]=edCd;
	//std::cerr<<"Case 2\n";
      }
    }
  }

  /////Memory increment code
  ws.push_back(g.getExit());
  
  while(!ws.empty()) {
    Node *w=ws.back();
    ws.pop_back();


    ///////
    //vector<Node *> lt;
    vector<Node *> lllt=g.getAllNodes();
    for(vector<Node *>::iterator EII=lllt.begin(); EII!=lllt.end() ;++EII){
      Node *lnode=*EII;
      Graph::nodeList &nl = g.getNodeList(lnode);
      //cerr<<"Size:"<<lllt.size()<<"\n";
      //cerr<<lnode->getElement()->getName()<<"\n";
      graphListElement *N = findNodeInList(nl, w);
      if (N){// lt.push_back(lnode);
	
	//Node *v=*pd;
	//Node *v=N->element;
	Node *v=lnode;
	//if chords has v->w
	
	Edge ed(v,w, N->weight, N->randId);
	getEdgeCode *edCd=new getEdgeCode();
	bool hasEdge=false;
	for(vector<Edge>::iterator CI=chords.begin(), CE=chords.end(); CI!=CE;
	    ++CI){
	  if(*CI==ed && CI->getWeight()==N->weight){
	    hasEdge=true;
	    break;
	  }
	}
	if(hasEdge){
	  char str[100];
	  if(instr[ed]!=NULL && instr[ed]->getCond()==1){
	    instr[ed]->setCond(4);
	  }
	  else{
	    edCd->setCond(5);
	    edCd->setInc(edIncrements[ed]);
	    instr[ed]=edCd;
	  }
	  
	}
	else if(g.getNumberOfOutgoingEdges(v)==1)
	  ws.push_back(v);
	else{
	  edCd->setCond(6);
	  instr[ed]=edCd;
	}
      }
    }
  }
  ///// Register increment code
  for(vector<Edge>::iterator CI=chords.begin(), CE=chords.end(); CI!=CE; ++CI){
    getEdgeCode *edCd=new getEdgeCode();
    if(instr[*CI]==NULL){
      edCd->setCond(3);
      edCd->setInc(edIncrements[*CI]);
      instr[*CI]=edCd;
    }
  }
}

//Add dummy edges corresponding to the back edges
//If a->b is a backedge
//then incoming dummy edge is root->b
//and outgoing dummy edge is a->exit
//changed
void addDummyEdges(vector<Edge > &stDummy, 
		   vector<Edge > &exDummy, 
		   Graph &g, vector<Edge> &be){
  for(vector<Edge >::iterator VI=be.begin(), VE=be.end(); VI!=VE; ++VI){
    Edge ed=*VI;
    Node *first=ed.getFirst();
    Node *second=ed.getSecond();
    g.removeEdge(ed);

    if(!(*second==*(g.getRoot()))){
      Edge *st=new Edge(g.getRoot(), second, ed.getWeight(), ed.getRandId());
      stDummy.push_back(*st);
      g.addEdgeForce(*st);
    }

    if(!(*first==*(g.getExit()))){
      Edge *ex=new Edge(first, g.getExit(), ed.getWeight(), ed.getRandId());
      exDummy.push_back(*ex);
      g.addEdgeForce(*ex);
    }
  }
}

//print a given edge in the form BB1Label->BB2Label
void printEdge(Edge ed){
  cerr<<((ed.getFirst())->getElement())
    ->getName()<<"->"<<((ed.getSecond())
			  ->getElement())->getName()<<
    ":"<<ed.getWeight()<<" rndId::"<<ed.getRandId()<<"\n";
}

//Move the incoming dummy edge code and outgoing dummy
//edge code over to the corresponding back edge
static void moveDummyCode(vector<Edge> &stDummy, 
                          vector<Edge> &exDummy, 
                          vector<Edge> &be,  
                          map<Edge, getEdgeCode *, EdgeCompare> &insertions, 
			  Graph &g){
  typedef vector<Edge >::iterator vec_iter;
  
  map<Edge,getEdgeCode *, EdgeCompare> temp;
  //iterate over edges with code
  std::vector<Edge> toErase;
  for(map<Edge,getEdgeCode *, EdgeCompare>::iterator MI=insertions.begin(), 
	ME=insertions.end(); MI!=ME; ++MI){
    Edge ed=MI->first;
    getEdgeCode *edCd=MI->second;

    ///---new code
    //iterate over be, and check if its starts and end vertices hv code
    for(vector<Edge>::iterator BEI=be.begin(), BEE=be.end(); BEI!=BEE; ++BEI){
      if(ed.getRandId()==BEI->getRandId()){
	
	//cerr<<"Looking at edge--------\n";
	//printEdge(ed);
	
	if(temp[*BEI]==0)
	  temp[*BEI]=new getEdgeCode();
	
	//so ed is either in st, or ex!
	if(ed.getFirst()==g.getRoot()){
	  //so its in stDummy
	  temp[*BEI]->setCdIn(edCd);
	  toErase.push_back(ed);
	}
	else if(ed.getSecond()==g.getExit()){
	  //so its in exDummy
	  toErase.push_back(ed);
	  temp[*BEI]->setCdOut(edCd);
	}
	else{
	  assert(false && "Not found in either start or end! Rand failed?");
	}
      }
    }
  }
  
  for(vector<Edge >::iterator vmi=toErase.begin(), vme=toErase.end(); vmi!=vme; 
      ++vmi){
    insertions.erase(*vmi);
    //cerr<<"Erasing from insertion\n";
    //printEdge(*vmi);
    g.removeEdgeWithWt(*vmi);
  }
  
  for(map<Edge,getEdgeCode *, EdgeCompare>::iterator MI=temp.begin(), 
      ME=temp.end(); MI!=ME; ++MI){
    insertions[MI->first]=MI->second;
    //cerr<<"inserting into insertion-----\n";
    //printEdge(MI->first);
  }
  //cerr<<"----\n";
  
  /*
    ///---new code end
    bool dummyHasIt=false;

    DEBUG(cerr<<"Current edge considered---\n";
          printEdge(ed));

    //now check if stDummy has ed
    for(vec_iter VI=stDummy.begin(), VE=stDummy.end(); VI!=VE && !dummyHasIt; 
	++VI){
      if(*VI==ed){
	//#ifdef DEBUG_PATH_PROFILES
	cerr<<"Edge matched with stDummy\n";
	printEdge(ed);
	//#endif
	dummyHasIt=true;
	bool dummyInBe=false;
	//dummy edge with code
	for(vec_iter BE=be.begin(), BEE=be.end(); BE!=BEE && !dummyInBe; ++BE){
	  Edge backEdge=*BE;
	  Node *st=backEdge.getSecond();
	  Node *dm=ed.getSecond();
	  if(*dm==*st){
	    //so this is the back edge to use
	    //#ifdef DEBUG_PATH_PROFILES
	    cerr<<"Moving to backedge\n";
	    printEdge(backEdge);
	    //#endif
	    getEdgeCode *ged=new getEdgeCode();
	    ged->setCdIn(edCd);
	    toErase.push_back(ed);//MI);//ed);
	    insertions[backEdge]=ged;
	    dummyInBe=true;
	  }
	}
	assert(dummyInBe);
	//modf
	//new
	//vec_iter VII=VI;
	stDummy.erase(VI);
	break;
	//end new
      }
    }
    if(!dummyHasIt){
      //so exDummy may hv it
      bool inExDummy=false;
      for(vec_iter VI=exDummy.begin(), VE=exDummy.end(); VI!=VE && !inExDummy; 
	  ++VI){
	if(*VI==ed){
	  inExDummy=true;

	  //#ifdef DEBUG_PATH_PROFILES
	  cerr<<"Edge matched with exDummy\n";
	  //#endif
	  bool dummyInBe2=false;
	  //dummy edge with code
	  for(vec_iter BE=be.begin(), BEE=be.end(); BE!=BEE && !dummyInBe2; 
	      ++BE){
	    Edge backEdge=*BE;
	    Node *st=backEdge.getFirst();
	    Node *dm=ed.getFirst();
	    if(*dm==*st){
	      //so this is the back edge to use
	      cerr<<"Moving to backedge\n";
	      printEdge(backEdge);
	      getEdgeCode *ged;
	      if(insertions[backEdge]==NULL)
		ged=new getEdgeCode();
	      else
		ged=insertions[backEdge];
	      toErase.push_back(ed);//MI);//ed);
	      ged->setCdOut(edCd);
	      insertions[backEdge]=ged;
	      dummyInBe2=true;
	    }
	  }
	  assert(dummyInBe2);
	  //modf
	  //vec_iter VII=VI;
	  exDummy.erase(VI);
	  break;
	  //end
	}
      }
    }
  }

  */
#ifdef DEBUG_PATH_PROFILES
  cerr<<"size of deletions: "<<toErase.size()<<"\n";
#endif
  
  /*
  for(vector<map<Edge, getEdgeCode *>::iterator>::iterator 
	vmi=toErase.begin(), vme=toErase.end(); vmi!=vme; ++vmi)

    insertions.erase(*vmi);
  */
#ifdef DEBUG_PATH_PROFILES
  cerr<<"SIZE OF INSERTIONS AFTER DEL "<<insertions.size()<<"\n";
#endif

}

//Do graph processing: to determine minimal edge increments, 
//appropriate code insertions etc and insert the code at
//appropriate locations
void processGraph(Graph &g, 
		  Instruction *rInst, 
		  Instruction *countInst, 
		  vector<Edge >& be, 
		  vector<Edge >& stDummy, 
		  vector<Edge >& exDummy, 
		  int numPaths){

  static int MethNo=0;
  MethNo++;
  //Given a graph: with exit->root edge, do the following in seq:
  //1. get back edges
  //2. insert dummy edges and remove back edges
  //3. get edge assignments
  //4. Get Max spanning tree of graph:
  //   -Make graph g2=g undirectional
  //   -Get Max spanning tree t
  //   -Make t undirectional
  //   -remove edges from t not in graph g
  //5. Get edge increments
  //6. Get code insertions
  //7. move code on dummy edges over to the back edges
  

  //This is used as maximum "weight" for 
  //priority queue
  //This would hold all 
  //right as long as number of paths in the graph
  //is less than this
  const int INFINITY=99999999;


  //step 1-3 are already done on the graph when this function is called
  DEBUG(printGraph(g));

  //step 4: Get Max spanning tree of graph

  //now insert exit to root edge
  //if its there earlier, remove it!
  //assign it weight INFINITY
  //so that this edge IS ALWAYS IN spanning tree
  //Note than edges in spanning tree do not get 
  //instrumented: and we do not want the
  //edge exit->root to get instrumented
  //as it MAY BE a dummy edge
  Edge ed(g.getExit(),g.getRoot(),INFINITY);
  g.addEdge(ed,INFINITY);
  Graph g2=g;

  //make g2 undirectional: this gives a better
  //maximal spanning tree
  g2.makeUnDirectional();
  DEBUG(printGraph(g2));

  Graph *t=g2.getMaxSpanningTree();
  //#ifdef DEBUG_PATH_PROFILES
  //cerr<<"Original maxspanning tree\n";
  //printGraph(*t);
  //#endif
  //now edges of tree t have weights reversed
  //(negative) because the algorithm used
  //to find max spanning tree is 
  //actually for finding min spanning tree
  //so get back the original weights
  t->reverseWts();

  //Ordinarily, the graph is directional
  //lets converts the graph into an 
  //undirectional graph
  //This is done by adding an edge
  //v->u for all existing edges u->v
  t->makeUnDirectional();

  //Given a tree t, and a "directed graph" g
  //replace the edges in the tree t with edges that exist in graph
  //The tree is formed from "undirectional" copy of graph
  //So whatever edges the tree has, the undirectional graph 
  //would have too. This function corrects some of the directions in 
  //the tree so that now, all edge directions in the tree match
  //the edge directions of corresponding edges in the directed graph
  removeTreeEdges(g, *t);

#ifdef DEBUG_PATH_PROFILES
  cerr<<"Final Spanning tree---------\n";
  printGraph(*t);
  cerr<<"-------end spanning tree\n";
#endif

  //now remove the exit->root node
  //and re-add it with weight 0
  //since infinite weight is kinda confusing
  g.removeEdge(ed);
  Edge edNew(g.getExit(), g.getRoot(),0);
  g.addEdge(edNew,0);
  if(t->hasEdge(ed)){
    t->removeEdge(ed);
    t->addEdge(edNew,0);
  }

  DEBUG(printGraph(g);
        printGraph(*t));

  //step 5: Get edge increments

  //Now we select a subset of all edges
  //and assign them some values such that 
  //if we consider just this subset, it still represents
  //the path sum along any path in the graph

  map<Edge, int, EdgeCompare> increment=getEdgeIncrements(g,*t);
#ifdef DEBUG_PATH_PROFILES
  //print edge increments for debugging
  
  for(map<Edge, int, EdgeCompare>::iterator M_I=increment.begin(), M_E=increment.end(); 
      M_I!=M_E; ++M_I){
    printEdge(M_I->first);
    cerr<<"Increment for above:"<<M_I->second<<"\n";
  }
#endif

 
  //step 6: Get code insertions
  
  //Based on edgeIncrements (above), now obtain
  //the kind of code to be inserted along an edge
  //The idea here is to minimize the computation
  //by inserting only the needed code
  vector<Edge> chords;
  getChords(chords, g, *t);


  //cerr<<"Graph before getCodeInsertion:\n";
  //printGraph(g);
  map<Edge, getEdgeCode *, EdgeCompare> codeInsertions;
  getCodeInsertions(g, codeInsertions, chords,increment);
  
#ifdef DEBUG_PATH_PROFILES
  //print edges with code for debugging
  cerr<<"Code inserted in following---------------\n";
  for(map<Edge, getEdgeCode *>::iterator cd_i=codeInsertions.begin(), 
	cd_e=codeInsertions.end(); cd_i!=cd_e; ++cd_i){
    printEdge(cd_i->first);
    cerr<<cd_i->second->getCond()<<":"<<cd_i->second->getInc()<<"\n";
  }
  cerr<<"-----end insertions\n";
#endif

  //step 7: move code on dummy edges over to the back edges

  //Move the incoming dummy edge code and outgoing dummy
  //edge code over to the corresponding back edge

  moveDummyCode(stDummy, exDummy, be, codeInsertions, g);
  //cerr<<"After dummy removals\n";
  //printGraph(g);

#ifdef DEBUG_PATH_PROFILES
  //debugging info
  cerr<<"After moving dummy code\n";
  for(map<Edge, getEdgeCode *>::iterator cd_i=codeInsertions.begin(), 
	cd_e=codeInsertions.end(); cd_i != cd_e; ++cd_i){
    printEdge(cd_i->first);
    cerr<<cd_i->second->getCond()<<":"
	<<cd_i->second->getInc()<<"\n";
  }
  cerr<<"Dummy end------------\n";
#endif


  //see what it looks like...
  //now insert code along edges which have codes on them
  for(map<Edge, getEdgeCode *>::iterator MI=codeInsertions.begin(), 
	ME=codeInsertions.end(); MI!=ME; ++MI){
    Edge ed=MI->first;
    insertBB(ed, MI->second, rInst, countInst, numPaths, MethNo);
  } 
}



//print the graph (for debugging)
void printGraph(Graph &g){
  vector<Node *> lt=g.getAllNodes();
  cerr<<"Graph---------------------\n";
  for(vector<Node *>::iterator LI=lt.begin(); 
      LI!=lt.end(); ++LI){
    cerr<<((*LI)->getElement())->getName()<<"->";
    Graph::nodeList nl=g.getNodeList(*LI);
    for(Graph::nodeList::iterator NI=nl.begin(); 
	NI!=nl.end(); ++NI){
      cerr<<":"<<"("<<(NI->element->getElement())
	->getName()<<":"<<NI->element->getWeight()<<","<<NI->weight<<","
	  <<NI->randId<<")";
    }
    cerr<<"\n";
  }
  cerr<<"--------------------Graph\n";
}


/*
////////// Getting back BBs from path number

#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/iMemory.h"
#include "llvm/iTerminators.h"
#include "llvm/iOther.h"
#include "llvm/iOperators.h"

#include "llvm/Support/CFG.h"
#include "llvm/BasicBlock.h"
#include "llvm/Pass.h"

void getPathFrmNode(Node *n, vector<BasicBlock*> &vBB, int pathNo, Graph g, 
		    vector<Edge> &stDummy, vector<Edge> &exDummy, vector<Edge> &be,
		    double strand){
  Graph::nodeList nlist=g.getNodeList(n);
  int maxCount=-9999999;
  bool isStart=false;

  if(*n==*g.getRoot())//its root: so first node of path
    isStart=true;

  double edgeRnd=0;
  Node *nextRoot=n;
  for(Graph::nodeList::iterator NLI=nlist.begin(), NLE=nlist.end(); NLI!=NLE;
      ++NLI){
    //cerr<<"Saw:"<<NLI->weight<<endl;
    if(NLI->weight>maxCount && NLI->weight<=pathNo){
      maxCount=NLI->weight;
      nextRoot=NLI->element;
      edgeRnd=NLI->randId;
      if(isStart)
	strand=NLI->randId;
    }
  }
  //cerr<<"Max:"<<maxCount<<endl;

  if(!isStart)
    assert(strand!=-1 && "strand not assigned!"); 

  assert(!(*nextRoot==*n && pathNo>0) && "No more BBs to go");
  assert(!(*nextRoot==*g.getExit() && pathNo-maxCount!=0) && "Reached exit");

  vBB.push_back(n->getElement());

  if(pathNo-maxCount==0 && *nextRoot==*g.getExit()){

    //look for strnd and edgeRnd now:
    bool has1=false, has2=false;
    //check if exit has it
    for(vector<Edge>::iterator VI=exDummy.begin(), VE=exDummy.end(); VI!=VE; 
	++VI){
      if(VI->getRandId()==edgeRnd){
	has2=true;
	//cerr<<"has2: looking at"<<std::endl;
	//printEdge(*VI);
	break;
      }
    }

    //check if start has it
    for(vector<Edge>::iterator VI=stDummy.begin(), VE=stDummy.end(); VI!=VE; 
	++VI){
      if(VI->getRandId()==strand){
	//cerr<<"has1: looking at"<<std::endl;
        //printEdge(*VI);
	has1=true;
	break;
      }
    }

    if(has1){
      //find backedge with endpoint vBB[1]
      for(vector<Edge>::iterator VI=be.begin(), VE=be.end(); VI!=VE; ++VI){
	assert(vBB.size()>0 && "vector too small");
	if( VI->getSecond()->getElement() == vBB[1] ){
	  vBB[0]=VI->getFirst()->getElement();
	  break;
	}
      }
    }

    if(has2){
      //find backedge with startpoint vBB[vBB.size()-1]
      for(vector<Edge>::iterator VI=be.begin(), VE=be.end(); VI!=VE; ++VI){
	assert(vBB.size()>0 && "vector too small");
	if( VI->getFirst()->getElement() == vBB[vBB.size()-1] ){
	  //if(vBB[0]==VI->getFirst()->getElement())
	  //vBB.erase(vBB.begin()+vBB.size()-1);
	  //else
	  vBB.push_back(VI->getSecond()->getElement());
	  break;
	}
      }
    }
    else 
      vBB.push_back(nextRoot->getElement());
   
    return;
  }

  assert(pathNo-maxCount>=0);

  return getPathFrmNode(nextRoot, vBB, pathNo-maxCount, g, stDummy, 
			exDummy, be, strand);
}


static Node *findBB(std::vector<Node *> &st, BasicBlock *BB){
  for(std::vector<Node *>::iterator si=st.begin(); si!=st.end(); ++si){
    if(((*si)->getElement())==BB){
      return *si;
    }
  }
  return NULL;
}

void getBBtrace(vector<BasicBlock *> &vBB, int pathNo, Function *M){

  //step 1: create graph
  //Transform the cfg s.t. we have just one exit node
  
  std::vector<Node *> nodes;
  std::vector<Edge> edges;
  Node *tmp;
  Node *exitNode=0, *startNode=0;
  
  BasicBlock *ExitNode = 0;
  for (Function::iterator I = M->begin(), E = M->end(); I != E; ++I) {
    BasicBlock *BB = *I;
    if (isa<ReturnInst>(BB->getTerminator())) {
      ExitNode = BB;
      break;
    }
  }
  
  assert(ExitNode!=0 && "exitnode not found");

  //iterating over BBs and making graph 
  //The nodes must be uniquesly identified:
  //That is, no two nodes must hav same BB*
  
  //First enter just nodes: later enter edges
  for(Function::iterator BB = M->begin(), BE=M->end(); BB != BE; ++BB){
    Node *nd=new Node(*BB);
    nodes.push_back(nd); 
    if(*BB==ExitNode)
      exitNode=nd;
    if(*BB==M->front())
      startNode=nd;
  }
  
  assert(exitNode!=0 && startNode!=0 && "Start or exit not found!");
 
  for (Function::iterator BB = M->begin(), BE=M->end(); BB != BE; ++BB){
    Node *nd=findBB(nodes, *BB);
    assert(nd && "No node for this edge!");

    for(BasicBlock::succ_iterator s=succ_begin(*BB), se=succ_end(*BB); 
	s!=se; ++s){
      Node *nd2=findBB(nodes,*s);
      assert(nd2 && "No node for this edge!");
      Edge ed(nd,nd2,0);
      edges.push_back(ed);
    }
  }
  
  static bool printed=false;
  Graph g(nodes,edges, startNode, exitNode);

  //if(!printed)
  //printGraph(g);

  if (M->getBasicBlocks().size() <= 1) return; //uninstrumented 

  //step 2: getBackEdges
  vector<Edge> be;
  g.getBackEdges(be);

  //cerr<<"BackEdges\n";
  //for(vector<Edge>::iterator VI=be.begin(); VI!=be.end(); ++VI){
    //printEdge(*VI);
    //cerr<<"\n";
  //}
  //cerr<<"------\n";
  //step 3: add dummy edges
  vector<Edge> stDummy;
  vector<Edge> exDummy;
  addDummyEdges(stDummy, exDummy, g, be);

  //cerr<<"After adding dummy edges\n";
  //printGraph(g);

  //step 4: value assgn to edges
  int numPaths=valueAssignmentToEdges(g);
  
  //if(!printed){
  //printGraph(g);
  //printed=true;
  //}

  //step 5: now travel from root, select max(edge) < pathNo, 
  //and go on until reach the exit
  return getPathFrmNode(g.getRoot(), vBB, pathNo, g, stDummy, exDummy, be, -1);
}

*/