lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp

   1 //===-- SelectionDAGPrinter.cpp - Implement SelectionDAG::viewGraph() -----===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This implements the SelectionDAG::viewGraph method.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Constants.h"
  15 #include "llvm/Function.h"
  16 #include "llvm/Assembly/Writer.h"
  17 #include "llvm/CodeGen/SelectionDAG.h"
  18 #include "llvm/CodeGen/MachineFunction.h"
  19 #include "llvm/Target/MRegisterInfo.h"
  20 #include "llvm/Target/TargetMachine.h"
  21 #include "llvm/Support/GraphWriter.h"
  22 #include "llvm/ADT/StringExtras.h"
  23 #include "llvm/Config/config.h"
  24 #include <fstream>
  25 #include <sstream>
  26 using namespace llvm;
  27
  28 namespace llvm {
  29   template<>
  30   struct DOTGraphTraits<SelectionDAG*> : public DefaultDOTGraphTraits {
  31     static std::string getGraphName(const SelectionDAG *G) {
  32       return G->getMachineFunction().getFunction()->getName();
  33     }
  34
  35     static bool renderGraphFromBottomUp() {
  36       return true;
  37     }
  38
  39     static bool hasNodeAddressLabel(const SDNode *Node,
  40                                     const SelectionDAG *Graph) {
  41       return true;
  42     }
  43
  44     static std::string getNodeLabel(const SDNode *Node,
  45                                     const SelectionDAG *Graph);
  46     static std::string getNodeAttributes(const SDNode *N) {
  47       return "shape=Mrecord";
  48     }
  49
  50     static void addCustomGraphFeatures(SelectionDAG *G,
  51                                        GraphWriter<SelectionDAG*> &GW) {
  52       GW.emitSimpleNode(0, "plaintext=circle", "GraphRoot");
  53       GW.emitEdge(0, -1, G->getRoot().Val, -1, "");
  54     }
  55   };
  56 }
  57
  58 std::string DOTGraphTraits<SelectionDAG*>::getNodeLabel(const SDNode *Node,
  59                                                         const SelectionDAG *G) {
  60   std::string Op = Node->getOperationName(G);
  61
  62   for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
  63     if (Node->getValueType(i) == MVT::Other)
  64       Op += ":ch";
  65     else
  66       Op = Op + ":" + MVT::getValueTypeString(Node->getValueType(i));
  67
  68   if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(Node)) {
  69     Op += ": " + utostr(CSDN->getValue());
  70   } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(Node)) {
  71     Op += ": " + ftostr(CSDN->getValue());
  72   } else if (const GlobalAddressSDNode *GADN =
  73              dyn_cast<GlobalAddressSDNode>(Node)) {
  74     int offset = GADN->getOffset();
  75     Op += ": " + GADN->getGlobal()->getName();
  76     if (offset > 0)
  77       Op += "+" + itostr(offset);
  78     else
  79       Op += itostr(offset);
  80   } else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(Node)) {
  81     Op += " " + itostr(FIDN->getIndex());
  82   } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Node)){
  83     if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->get()))
  84       Op += "<" + ftostr(CFP->getValue()) + ">";
  85     else if (ConstantInt *CI = dyn_cast<ConstantInt>(CP->get()))
  86       Op += "<" + utostr(CI->getZExtValue()) + ">";
  87     else {
  88       std::ostringstream SS;
  89       WriteAsOperand(SS, CP->get(), false);
  90       Op += "<" + SS.str() + ">";
  91     }
  92   } else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(Node)) {
  93     Op = "BB: ";
  94     const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock();
  95     if (LBB)
  96       Op += LBB->getName();
  97     //Op += " " + (const void*)BBDN->getBasicBlock();
  98   } else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(Node)) {
  99     if (G && R->getReg() != 0 && MRegisterInfo::isPhysicalRegister(R->getReg())) {
 100       Op = Op + " " + G->getTarget().getRegisterInfo()->getName(R->getReg());
 101     } else {
 102       Op += " #" + utostr(R->getReg());
 103     }
 104   } else if (const ExternalSymbolSDNode *ES =
 105              dyn_cast<ExternalSymbolSDNode>(Node)) {
 106     Op += "'" + std::string(ES->getSymbol()) + "'";
 107   } else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(Node)) {
 108     if (M->getValue())
 109       Op += "<" + M->getValue()->getName() + ":" + itostr(M->getOffset()) + ">";
 110     else
 111       Op += "<null:" + itostr(M->getOffset()) + ">";
 112   } else if (const VTSDNode *N = dyn_cast<VTSDNode>(Node)) {
 113     Op = Op + " VT=" + getValueTypeString(N->getVT());
 114   } else if (const StringSDNode *N = dyn_cast<StringSDNode>(Node)) {
 115     Op = Op + "\"" + N->getValue() + "\"";
 116   }
 117
 118   return Op;
 119 }
 120
 121
 122 /// viewGraph - Pop up a ghostview window with the reachable parts of the DAG
 123 /// rendered using 'dot'.
 124 ///
 125 void SelectionDAG::viewGraph() {
 126 // This code is only for debugging!
 127 #ifndef NDEBUG
 128   ViewGraph(this, "dag." + getMachineFunction().getFunction()->getName());
 129 #else
 130   std::cerr << "SelectionDAG::viewGraph is only available in debug builds on "
 131             << "systems with Graphviz or gv!\n";
 132 #endif  // NDEBUG
 133 }