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annotate include/llvm/Analysis/CFGPrinter.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children 1172e4bd9c6f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===-- CFGPrinter.h - CFG printer external interface -----------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file defines external functions that can be called to explicitly
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11 // instantiate the CFG printer.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_ANALYSIS_CFGPRINTER_H
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16 #define LLVM_ANALYSIS_CFGPRINTER_H
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17
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18 #include "llvm/IR/CFG.h"
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19 #include "llvm/IR/Constants.h"
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20 #include "llvm/IR/Function.h"
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21 #include "llvm/IR/Instructions.h"
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22 #include "llvm/Support/GraphWriter.h"
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23
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24 namespace llvm {
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25 template<>
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26 struct DOTGraphTraits<const Function*> : public DefaultDOTGraphTraits {
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27
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28 DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
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29
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30 static std::string getGraphName(const Function *F) {
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31 return "CFG for '" + F->getName().str() + "' function";
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32 }
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33
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34 static std::string getSimpleNodeLabel(const BasicBlock *Node,
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35 const Function *) {
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36 if (!Node->getName().empty())
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37 return Node->getName().str();
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38
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39 std::string Str;
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40 raw_string_ostream OS(Str);
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41
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42 Node->printAsOperand(OS, false);
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43 return OS.str();
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44 }
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45
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46 static std::string getCompleteNodeLabel(const BasicBlock *Node,
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47 const Function *) {
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48 enum { MaxColumns = 80 };
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49 std::string Str;
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50 raw_string_ostream OS(Str);
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51
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52 if (Node->getName().empty()) {
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53 Node->printAsOperand(OS, false);
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54 OS << ":";
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55 }
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56
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57 OS << *Node;
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58 std::string OutStr = OS.str();
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59 if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
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60
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61 // Process string output to make it nicer...
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62 unsigned ColNum = 0;
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63 unsigned LastSpace = 0;
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64 for (unsigned i = 0; i != OutStr.length(); ++i) {
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65 if (OutStr[i] == '\n') { // Left justify
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66 OutStr[i] = '\\';
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67 OutStr.insert(OutStr.begin()+i+1, 'l');
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68 ColNum = 0;
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69 LastSpace = 0;
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70 } else if (OutStr[i] == ';') { // Delete comments!
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71 unsigned Idx = OutStr.find('\n', i+1); // Find end of line
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72 OutStr.erase(OutStr.begin()+i, OutStr.begin()+Idx);
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73 --i;
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74 } else if (ColNum == MaxColumns) { // Wrap lines.
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75 // Wrap very long names even though we can't find a space.
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76 if (!LastSpace)
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77 LastSpace = i;
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78 OutStr.insert(LastSpace, "\\l...");
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79 ColNum = i - LastSpace;
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80 LastSpace = 0;
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81 i += 3; // The loop will advance 'i' again.
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82 }
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83 else
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84 ++ColNum;
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85 if (OutStr[i] == ' ')
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86 LastSpace = i;
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87 }
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88 return OutStr;
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89 }
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90
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91 std::string getNodeLabel(const BasicBlock *Node,
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92 const Function *Graph) {
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93 if (isSimple())
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94 return getSimpleNodeLabel(Node, Graph);
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95 else
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96 return getCompleteNodeLabel(Node, Graph);
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97 }
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98
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99 static std::string getEdgeSourceLabel(const BasicBlock *Node,
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100 succ_const_iterator I) {
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101 // Label source of conditional branches with "T" or "F"
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102 if (const BranchInst *BI = dyn_cast<BranchInst>(Node->getTerminator()))
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103 if (BI->isConditional())
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104 return (I == succ_begin(Node)) ? "T" : "F";
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105
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106 // Label source of switch edges with the associated value.
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107 if (const SwitchInst *SI = dyn_cast<SwitchInst>(Node->getTerminator())) {
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108 unsigned SuccNo = I.getSuccessorIndex();
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109
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110 if (SuccNo == 0) return "def";
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111
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112 std::string Str;
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113 raw_string_ostream OS(Str);
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114 SwitchInst::ConstCaseIt Case =
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115 SwitchInst::ConstCaseIt::fromSuccessorIndex(SI, SuccNo);
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116 OS << Case.getCaseValue()->getValue();
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117 return OS.str();
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118 }
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119 return "";
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120 }
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121 };
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122 } // End llvm namespace
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123
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124 namespace llvm {
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125 class FunctionPass;
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126 FunctionPass *createCFGPrinterPass ();
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127 FunctionPass *createCFGOnlyPrinterPass ();
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128 } // End llvm namespace
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129
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130 #endif