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