//===- Printer.cpp - Code for printing data structure graphs nicely -------===//
//
// This file implements the 'dot' graph printer.
//
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/DataStructure.h"
#include "llvm/Analysis/DSGraph.h"
#include "llvm/Analysis/DSGraphTraits.h"
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "Support/CommandLine.h"
#include "Support/GraphWriter.h"
#include <fstream>
#include <sstream>
using std::string;

// OnlyPrintMain - The DataStructure printer exposes this option to allow
// printing of only the graph for "main".
//
static cl::opt<bool> OnlyPrintMain("only-print-main-ds", cl::ReallyHidden);


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

static string getCaption(const DSNode *N, const DSGraph *G) {
  std::stringstream OS;
  Module *M = G && &G->getFunction() ? G->getFunction().getParent() : 0;

  for (unsigned i = 0, e = N->getTypeEntries().size(); i != e; ++i) {
    WriteTypeSymbolic(OS, N->getTypeEntries()[i].Ty, M);
    if (N->getTypeEntries()[i].Offset)
      OS << "@" << N->getTypeEntries()[i].Offset;
    OS << "\n";
  }

  if (N->NodeType & DSNode::ScalarNode) OS << "S";
  if (N->NodeType & DSNode::AllocaNode) OS << "A";
  if (N->NodeType & DSNode::NewNode   ) OS << "N";
  if (N->NodeType & DSNode::GlobalNode) OS << "G";
  if (N->NodeType & DSNode::Incomplete) OS << "I";
  if (N->NodeType & DSNode::Modified  ) OS << "M";
  if (N->NodeType & DSNode::Read      ) OS << "R";

  for (unsigned i = 0, e = N->getGlobals().size(); i != e; ++i) {
    WriteAsOperand(OS, N->getGlobals()[i], false, true, M);
    OS << "\n";
  }

  if ((N->NodeType & DSNode::ScalarNode) && G) {
    const std::map<Value*, DSNodeHandle> &VM = G->getValueMap();
    for (std::map<Value*, DSNodeHandle>::const_iterator I = VM.begin(),
           E = VM.end(); I != E; ++I)
      if (I->second.getNode() == N) {
        WriteAsOperand(OS, I->first, false, true, M);
        OS << "\n";
      }
  }
  return OS.str();
}

template<>
struct DOTGraphTraits<const DSGraph*> : public DefaultDOTGraphTraits {
  static std::string getGraphName(const DSGraph *G) {
    if (G->hasFunction())
      return "Function " + G->getFunction().getName();
    else
      return "Non-function graph";
  }

  static const char *getGraphProperties(const DSGraph *G) {
    return "\tedge [arrowtail=\"dot\"];\n"
           "\tsize=\"10,7.5\";\n"
           "\trotate=\"90\";\n";
  }

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

  static std::string getNodeAttributes(const DSNode *N) {
    return "shape=Mrecord";//fontname=Courier";
  }
  
  static int getEdgeSourceLabel(const DSNode *Node, DSNode::iterator I) {
    assert(Node == I.getNode() && "Iterator not for this node!");
    return Node->getMergeMapLabel(I.getOffset());
  }

  /// addCustomGraphFeatures - Use this graph writing hook to emit call nodes
  /// and the return node.
  ///
  static void addCustomGraphFeatures(const DSGraph *G,
                                     GraphWriter<const DSGraph*> &GW) {
    // Output the returned value pointer...
    if (G->getRetNode().getNode() != 0) {
      // Output the return node...
      GW.emitSimpleNode((void*)1, "plaintext=circle", "returning");

      // Add edge from return node to real destination
      int RetEdgeDest = G->getRetNode().getOffset();
      if (RetEdgeDest == 0) RetEdgeDest = -1;
      GW.emitEdge((void*)1, -1, G->getRetNode().getNode(),
                  RetEdgeDest, "arrowtail=tee,color=gray63");
    }

    // Output all of the call nodes...
    const std::vector<std::vector<DSNodeHandle> > &FCs = G->getFunctionCalls();
    for (unsigned i = 0, e = FCs.size(); i != e; ++i) {
      const std::vector<DSNodeHandle> &Call = FCs[i];
      GW.emitSimpleNode(&Call, "shape=record", "call", Call.size());

      for (unsigned j = 0, e = Call.size(); j != e; ++j)
        if (Call[j].getNode()) {
          int EdgeDest = Call[j].getOffset();
          if (EdgeDest == 0) EdgeDest = -1;
          GW.emitEdge(&Call, j, Call[j].getNode(), EdgeDest, "color=gray63");
        }
    }
  }
};

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 string &GraphName) const {
  string Filename = GraphName + ".dot";
  O << "Writing '" << Filename << "'...";
  std::ofstream F(Filename.c_str());
  
  if (F.good()) {
    print(F);
    O << " [" << getGraphSize() << "+" << getFunctionCalls().size() << "]\n";
  } else {
    O << "  error opening file for writing!\n";
  }
}

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

  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
    if (!I->isExternal() && (I->getName() == "main" || !OnlyPrintMain))
      C.getDSGraph((Function&)*I).writeGraphToFile(O, Prefix+I->getName());
}


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

void BUDataStructures::print(std::ostream &O, const Module *M) const {
  printCollection(*this, O, M, "bu.");
#if 0
  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
    if (!I->isExternal()) {
      (*getDSGraph(*I).GlobalsGraph)->writeGraphToFile(O, "gg.program");
      break;
    }
#endif
}

void TDDataStructures::print(std::ostream &O, const Module *M) const {
  printCollection(*this, O, M, "td.");
#if 0
  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
    if (!I->isExternal()) {
      (*getDSGraph(*I).GlobalsGraph)->writeGraphToFile(O, "gg.program");
      break;
    }
#endif
}