SelectionDAGPrinter.cpp revision 9d5b532de9bdca37810a59a93a69128441b02c55 
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>
26using namespace llvm;
27
28namespace 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
58std::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///
125void 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}
134