1 //===-- ScheduleDAGPrinter.cpp - Implement ScheduleDAG::viewGraph() -------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This implements the ScheduleDAG::viewGraph method. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/ADT/StringExtras.h" 14 #include "llvm/CodeGen/MachineConstantPool.h" 15 #include "llvm/CodeGen/MachineFunction.h" 16 #include "llvm/CodeGen/ScheduleDAG.h" 17 #include "llvm/CodeGen/TargetRegisterInfo.h" 18 #include "llvm/IR/Constants.h" 19 #include "llvm/Support/Debug.h" 20 #include "llvm/Support/GraphWriter.h" 21 #include "llvm/Support/raw_ostream.h" 22 using namespace llvm; 23 24 namespace llvm { 25 template<> 26 struct DOTGraphTraits<ScheduleDAG*> : public DefaultDOTGraphTraits { 27 28 DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {} 29 30 static std::string getGraphName(const ScheduleDAG *G) { 31 return std::string(G->MF.getName()); 32 } 33 34 static bool renderGraphFromBottomUp() { 35 return true; 36 } 37 38 static bool isNodeHidden(const SUnit *Node, const ScheduleDAG *G) { 39 return (Node->NumPreds > 10 || Node->NumSuccs > 10); 40 } 41 42 static std::string getNodeIdentifierLabel(const SUnit *Node, 43 const ScheduleDAG *Graph) { 44 std::string R; 45 raw_string_ostream OS(R); 46 OS << static_cast<const void *>(Node); 47 return R; 48 } 49 50 /// If you want to override the dot attributes printed for a particular 51 /// edge, override this method. 52 static std::string getEdgeAttributes(const SUnit *Node, 53 SUnitIterator EI, 54 const ScheduleDAG *Graph) { 55 if (EI.isArtificialDep()) 56 return "color=cyan,style=dashed"; 57 if (EI.isCtrlDep()) 58 return "color=blue,style=dashed"; 59 return ""; 60 } 61 62 63 std::string getNodeLabel(const SUnit *SU, const ScheduleDAG *Graph); 64 static std::string getNodeAttributes(const SUnit *N, 65 const ScheduleDAG *Graph) { 66 return "shape=Mrecord"; 67 } 68 69 static void addCustomGraphFeatures(ScheduleDAG *G, 70 GraphWriter<ScheduleDAG*> &GW) { 71 return G->addCustomGraphFeatures(GW); 72 } 73 }; 74 } 75 76 std::string DOTGraphTraits<ScheduleDAG*>::getNodeLabel(const SUnit *SU, 77 const ScheduleDAG *G) { 78 return G->getGraphNodeLabel(SU); 79 } 80 81 /// viewGraph - Pop up a ghostview window with the reachable parts of the DAG 82 /// rendered using 'dot'. 83 /// 84 void ScheduleDAG::viewGraph(const Twine &Name, const Twine &Title) { 85 // This code is only for debugging! 86 #ifndef NDEBUG 87 ViewGraph(this, Name, false, Title); 88 #else 89 errs() << "ScheduleDAG::viewGraph is only available in debug builds on " 90 << "systems with Graphviz or gv!\n"; 91 #endif // NDEBUG 92 } 93 94 /// Out-of-line implementation with no arguments is handy for gdb. 95 void ScheduleDAG::viewGraph() { 96 viewGraph(getDAGName(), "Scheduling-Units Graph for " + getDAGName()); 97 } 98