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      1 //===-- ScheduleDAGPrinter.cpp - Implement ScheduleDAG::viewGraph() -------===//
      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 implements the ScheduleDAG::viewGraph method.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "llvm/CodeGen/ScheduleDAG.h"
     15 #include "llvm/ADT/DenseSet.h"
     16 #include "llvm/ADT/StringExtras.h"
     17 #include "llvm/CodeGen/MachineConstantPool.h"
     18 #include "llvm/CodeGen/MachineFunction.h"
     19 #include "llvm/CodeGen/MachineModuleInfo.h"
     20 #include "llvm/IR/Constants.h"
     21 #include "llvm/Support/Debug.h"
     22 #include "llvm/Support/GraphWriter.h"
     23 #include "llvm/Support/raw_ostream.h"
     24 #include "llvm/Target/TargetRegisterInfo.h"
     25 #include <fstream>
     26 using namespace llvm;
     27 
     28 namespace llvm {
     29   template<>
     30   struct DOTGraphTraits<ScheduleDAG*> : public DefaultDOTGraphTraits {
     31 
     32   DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
     33 
     34     static std::string getGraphName(const ScheduleDAG *G) {
     35       return G->MF.getName();
     36     }
     37 
     38     static bool renderGraphFromBottomUp() {
     39       return true;
     40     }
     41 
     42     static bool isNodeHidden(const SUnit *Node) {
     43       return (Node->NumPreds > 10 || Node->NumSuccs > 10);
     44     }
     45 
     46     static bool hasNodeAddressLabel(const SUnit *Node,
     47                                     const ScheduleDAG *Graph) {
     48       return true;
     49     }
     50 
     51     /// If you want to override the dot attributes printed for a particular
     52     /// edge, override this method.
     53     static std::string getEdgeAttributes(const SUnit *Node,
     54                                          SUnitIterator EI,
     55                                          const ScheduleDAG *Graph) {
     56       if (EI.isArtificialDep())
     57         return "color=cyan,style=dashed";
     58       if (EI.isCtrlDep())
     59         return "color=blue,style=dashed";
     60       return "";
     61     }
     62 
     63 
     64     std::string getNodeLabel(const SUnit *Node, const ScheduleDAG *Graph);
     65     static std::string getNodeAttributes(const SUnit *N,
     66                                          const ScheduleDAG *Graph) {
     67       return "shape=Mrecord";
     68     }
     69 
     70     static void addCustomGraphFeatures(ScheduleDAG *G,
     71                                        GraphWriter<ScheduleDAG*> &GW) {
     72       return G->addCustomGraphFeatures(GW);
     73     }
     74   };
     75 }
     76 
     77 std::string DOTGraphTraits<ScheduleDAG*>::getNodeLabel(const SUnit *SU,
     78                                                        const ScheduleDAG *G) {
     79   return G->getGraphNodeLabel(SU);
     80 }
     81 
     82 /// viewGraph - Pop up a ghostview window with the reachable parts of the DAG
     83 /// rendered using 'dot'.
     84 ///
     85 void ScheduleDAG::viewGraph(const Twine &Name, const Twine &Title) {
     86   // This code is only for debugging!
     87 #ifndef NDEBUG
     88   ViewGraph(this, Name, false, Title);
     89 #else
     90   errs() << "ScheduleDAG::viewGraph is only available in debug builds on "
     91          << "systems with Graphviz or gv!\n";
     92 #endif  // NDEBUG
     93 }
     94 
     95 /// Out-of-line implementation with no arguments is handy for gdb.
     96 void ScheduleDAG::viewGraph() {
     97   viewGraph(getDAGName(), "Scheduling-Units Graph for " + getDAGName());
     98 }
     99