tools/opt/GraphPrinters.cpp

   1 //===- GraphPrinters.cpp - DOT printers for various graph types -----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines several printers for various different types of graphs used
  11 // by the LLVM infrastructure.  It uses the generic graph interface to convert
  12 // the graph into a .dot graph.  These graphs can then be processed with the
  13 // "dot" tool to convert them to postscript or some other suitable format.
  14 //
  15 //===----------------------------------------------------------------------===//
  16
  17 #include "llvm/Support/GraphWriter.h"
  18 #include "llvm/Pass.h"
  19 #include "llvm/Value.h"
  20 #include "llvm/Analysis/CallGraph.h"
  21 #include <iostream>
  22 #include <fstream>
  23 using namespace llvm;
  24
  25 template<typename GraphType>
  26 static void WriteGraphToFile(std::ostream &O, const std::string &GraphName,
  27                              const GraphType &GT) {
  28   std::string Filename = GraphName + ".dot";
  29   O << "Writing '" << Filename << "'...";
  30   std::ofstream F(Filename.c_str());
  31
  32   if (F.good())
  33     WriteGraph(F, GT);
  34   else
  35     O << "  error opening file for writing!";
  36   O << "\n";
  37 }
  38
  39
  40 //===----------------------------------------------------------------------===//
  41 //                              Call Graph Printer
  42 //===----------------------------------------------------------------------===//
  43
  44 namespace llvm {
  45   template<>
  46   struct DOTGraphTraits<CallGraph*> : public DefaultDOTGraphTraits {
  47     static std::string getGraphName(CallGraph *F) {
  48       return "Call Graph";
  49     }
  50
  51     static std::string getNodeLabel(CallGraphNode *Node, CallGraph *Graph) {
  52       if (Node->getFunction())
  53         return ((Value*)Node->getFunction())->getName();
  54       else
  55         return "Indirect call node";
  56     }
  57   };
  58 }
  59
  60
  61 namespace {
  62   struct CallGraphPrinter : public ModulePass {
  63     static char ID; // Pass ID, replacement for typeid
  64     CallGraphPrinter() : ModulePass((intptr_t)&ID) {}
  65
  66     virtual bool runOnModule(Module &M) {
  67       WriteGraphToFile(std::cerr, "callgraph", &getAnalysis<CallGraph>());
  68       return false;
  69     }
  70
  71     void print(std::ostream &OS) const {}
  72     void print(std::ostream &OS, const llvm::Module*) const {}
  73
  74     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  75       AU.addRequired<CallGraph>();
  76       AU.setPreservesAll();
  77     }
  78   };
  79
  80   char CallGraphPrinter::ID = 0;
  81   RegisterPass<CallGraphPrinter> P2("print-callgraph",
  82                                     "Print Call Graph to 'dot' file");
  83 }