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