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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/StringExtras.h"
     16 #include "llvm/CodeGen/MachineConstantPool.h"
     17 #include "llvm/CodeGen/MachineFunction.h"
     18 #include "llvm/CodeGen/MachineModuleInfo.h"
     19 #include "llvm/IR/Constants.h"
     20 #include "llvm/Support/Debug.h"
     21 #include "llvm/Support/GraphWriter.h"
     22 #include "llvm/Support/raw_ostream.h"
     23 #include "llvm/Target/TargetRegisterInfo.h"
     24 #include <fstream>
     25 using namespace llvm;
     26 
     27 namespace llvm {
     28   template<>
     29   struct DOTGraphTraits<ScheduleDAG*> : public DefaultDOTGraphTraits {
     30 
     31   DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
     32 
     33     static std::string getGraphName(const ScheduleDAG *G) {
     34       return G->MF.getName();
     35     }
     36 
     37     static bool renderGraphFromBottomUp() {
     38       return true;
     39     }
     40 
     41     static bool isNodeHidden(const SUnit *Node) {
     42       return (Node->NumPreds > 10 || Node->NumSuccs > 10);
     43     }
     44 
     45     static std::string getNodeIdentifierLabel(const SUnit *Node,
     46                                               const ScheduleDAG *Graph) {
     47       std::string R;
     48       raw_string_ostream OS(R);
     49       OS << static_cast<const void *>(Node);
     50       return R;
     51     }
     52 
     53     /// If you want to override the dot attributes printed for a particular
     54     /// edge, override this method.
     55     static std::string getEdgeAttributes(const SUnit *Node,
     56                                          SUnitIterator EI,
     57                                          const ScheduleDAG *Graph) {
     58       if (EI.isArtificialDep())
     59         return "color=cyan,style=dashed";
     60       if (EI.isCtrlDep())
     61         return "color=blue,style=dashed";
     62       return "";
     63     }
     64 
     65 
     66     std::string getNodeLabel(const SUnit *Node, const ScheduleDAG *Graph);
     67     static std::string getNodeAttributes(const SUnit *N,
     68                                          const ScheduleDAG *Graph) {
     69       return "shape=Mrecord";
     70     }
     71 
     72     static void addCustomGraphFeatures(ScheduleDAG *G,
     73                                        GraphWriter<ScheduleDAG*> &GW) {
     74       return G->addCustomGraphFeatures(GW);
     75     }
     76   };
     77 }
     78 
     79 std::string DOTGraphTraits<ScheduleDAG*>::getNodeLabel(const SUnit *SU,
     80                                                        const ScheduleDAG *G) {
     81   return G->getGraphNodeLabel(SU);
     82 }
     83 
     84 /// viewGraph - Pop up a ghostview window with the reachable parts of the DAG
     85 /// rendered using 'dot'.
     86 ///
     87 void ScheduleDAG::viewGraph(const Twine &Name, const Twine &Title) {
     88   // This code is only for debugging!
     89 #ifndef NDEBUG
     90   ViewGraph(this, Name, false, Title);
     91 #else
     92   errs() << "ScheduleDAG::viewGraph is only available in debug builds on "
     93          << "systems with Graphviz or gv!\n";
     94 #endif  // NDEBUG
     95 }
     96 
     97 /// Out-of-line implementation with no arguments is handy for gdb.
     98 void ScheduleDAG::viewGraph() {
     99   viewGraph(getDAGName(), "Scheduling-Units Graph for " + getDAGName());
    100 }
    101