tools/opt/GraphPrinters.cpp

   1 //===- GraphPrinters.cpp - DOT printers for various graph types -----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // 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 "llvm/Analysis/Dominators.h"
  22 #include <iostream>
  23 #include <fstream>
  24 using namespace llvm;
  25
  26 template<typename GraphType>
  27 static void WriteGraphToFile(std::ostream &O, const std::string &GraphName,
  28                              const GraphType &GT) {
  29   std::string Filename = GraphName + ".dot";
  30   O << "Writing '" << Filename << "'...";
  31   std::ofstream F(Filename.c_str());
  32
  33   if (F.good())
  34     WriteGraph(F, GT);
  35   else
  36     O << "  error opening file for writing!";
  37   O << "\n";
  38 }
  39
  40
  41 //===----------------------------------------------------------------------===//
  42 //                              Call Graph Printer
  43 //===----------------------------------------------------------------------===//
  44
  45 namespace llvm {
  46   template<>
  47   struct DOTGraphTraits<CallGraph*> : public DefaultDOTGraphTraits {
  48     static std::string getGraphName(CallGraph *F) {
  49       return "Call Graph";
  50     }
  51
  52     static std::string getNodeLabel(CallGraphNode *Node, CallGraph *Graph) {
  53       if (Node->getFunction())
  54         return ((Value*)Node->getFunction())->getName();
  55       else
  56         return "Indirect call node";
  57     }
  58   };
  59 }
  60
  61
  62 namespace {
  63   struct CallGraphPrinter : public ModulePass {
  64     static char ID; // Pass ID, replacement for typeid
  65     CallGraphPrinter() : ModulePass(&ID) {}
  66
  67     virtual bool runOnModule(Module &M) {
  68       WriteGraphToFile(std::cerr, "callgraph", &getAnalysis<CallGraph>());
  69       return false;
  70     }
  71
  72     void print(std::ostream &OS) const {}
  73     void print(std::ostream &OS, const llvm::Module*) const {}
  74
  75     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  76       AU.addRequired<CallGraph>();
  77       AU.setPreservesAll();
  78     }
  79   };
  80
  81   char CallGraphPrinter::ID = 0;
  82   RegisterPass<CallGraphPrinter> P2("dot-callgraph",
  83                                     "Print Call Graph to 'dot' file");
  84 }
  85
  86 //===----------------------------------------------------------------------===//
  87 //                            DomInfoPrinter Pass
  88 //===----------------------------------------------------------------------===//
  89
  90 namespace {
  91   class DomInfoPrinter : public FunctionPass {
  92   public:
  93     static char ID; // Pass identification, replacement for typeid
  94     DomInfoPrinter() : FunctionPass(&ID) {}
  95
  96     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  97       AU.setPreservesAll();
  98       AU.addRequired<DominatorTree>();
  99       AU.addRequired<DominanceFrontier>();
 100
 101     }
 102
 103     virtual bool runOnFunction(Function &F) {
 104       DominatorTree &DT = getAnalysis<DominatorTree>();
 105       DT.dump();
 106       DominanceFrontier &DF = getAnalysis<DominanceFrontier>();
 107       DF.dump();
 108       return false;
 109     }
 110   };
 111
 112   char DomInfoPrinter::ID = 0;
 113   static RegisterPass<DomInfoPrinter>
 114   DIP("print-dom-info", "Dominator Info Printer", true, true);
 115 }