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1 //===--- DependencyGraph.cpp - Generate dependency file -------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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2 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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3 // The LLVM Compiler Infrastructure
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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4 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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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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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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9 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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10 // This code generates a header dependency graph in DOT format, for use
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11 // with, e.g., GraphViz.
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12 //
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13 //===----------------------------------------------------------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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14
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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15 #include "clang/Frontend/Utils.h"
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16 #include "clang/Basic/FileManager.h"
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17 #include "clang/Basic/SourceManager.h"
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18 #include "clang/Frontend/FrontendDiagnostic.h"
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19 #include "clang/Lex/PPCallbacks.h"
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20 #include "clang/Lex/Preprocessor.h"
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21 #include "llvm/ADT/SetVector.h"
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22 #include "llvm/Support/GraphWriter.h"
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23 #include "llvm/Support/raw_ostream.h"
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24
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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25 using namespace clang;
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26 namespace DOT = llvm::DOT;
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27
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28 namespace {
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29 class DependencyGraphCallback : public PPCallbacks {
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30 const Preprocessor *PP;
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31 std::string OutputFile;
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32 std::string SysRoot;
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33 llvm::SetVector<const FileEntry *> AllFiles;
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34 typedef llvm::DenseMap<const FileEntry *,
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35 SmallVector<const FileEntry *, 2> > DependencyMap;
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36
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37 DependencyMap Dependencies;
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38
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39 private:
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40 raw_ostream &writeNodeReference(raw_ostream &OS,
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41 const FileEntry *Node);
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42 void OutputGraphFile();
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43
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44 public:
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45 DependencyGraphCallback(const Preprocessor *_PP, StringRef OutputFile,
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46 StringRef SysRoot)
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47 : PP(_PP), OutputFile(OutputFile.str()), SysRoot(SysRoot.str()) { }
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48
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77
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49 void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
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50 StringRef FileName, bool IsAngled,
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51 CharSourceRange FilenameRange, const FileEntry *File,
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52 StringRef SearchPath, StringRef RelativePath,
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53 const Module *Imported) override;
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54
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77
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55 void EndOfMainFile() override {
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56 OutputGraphFile();
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57 }
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58
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59 };
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60 }
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61
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62 void clang::AttachDependencyGraphGen(Preprocessor &PP, StringRef OutputFile,
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63 StringRef SysRoot) {
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64 PP.addPPCallbacks(new DependencyGraphCallback(&PP, OutputFile, SysRoot));
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65 }
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66
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67 void DependencyGraphCallback::InclusionDirective(SourceLocation HashLoc,
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68 const Token &IncludeTok,
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69 StringRef FileName,
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70 bool IsAngled,
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71 CharSourceRange FilenameRange,
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72 const FileEntry *File,
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73 StringRef SearchPath,
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74 StringRef RelativePath,
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75 const Module *Imported) {
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76 if (!File)
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77 return;
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78
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79 SourceManager &SM = PP->getSourceManager();
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80 const FileEntry *FromFile
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81 = SM.getFileEntryForID(SM.getFileID(SM.getExpansionLoc(HashLoc)));
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77
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82 if (!FromFile)
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83 return;
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84
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85 Dependencies[FromFile].push_back(File);
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86
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87 AllFiles.insert(File);
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88 AllFiles.insert(FromFile);
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89 }
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90
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91 raw_ostream &
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92 DependencyGraphCallback::writeNodeReference(raw_ostream &OS,
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93 const FileEntry *Node) {
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94 OS << "header_" << Node->getUID();
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95 return OS;
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96 }
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97
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98 void DependencyGraphCallback::OutputGraphFile() {
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77
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99 std::error_code EC;
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100 llvm::raw_fd_ostream OS(OutputFile, EC, llvm::sys::fs::F_Text);
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101 if (EC) {
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102 PP->getDiagnostics().Report(diag::err_fe_error_opening) << OutputFile
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103 << EC.message();
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104 return;
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105 }
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106
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107 OS << "digraph \"dependencies\" {\n";
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108
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109 // Write the nodes
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110 for (unsigned I = 0, N = AllFiles.size(); I != N; ++I) {
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111 // Write the node itself.
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112 OS.indent(2);
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113 writeNodeReference(OS, AllFiles[I]);
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114 OS << " [ shape=\"box\", label=\"";
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115 StringRef FileName = AllFiles[I]->getName();
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116 if (FileName.startswith(SysRoot))
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117 FileName = FileName.substr(SysRoot.size());
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118
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119 OS << DOT::EscapeString(FileName)
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120 << "\"];\n";
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121 }
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122
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123 // Write the edges
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124 for (DependencyMap::iterator F = Dependencies.begin(),
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125 FEnd = Dependencies.end();
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126 F != FEnd; ++F) {
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127 for (unsigned I = 0, N = F->second.size(); I != N; ++I) {
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128 OS.indent(2);
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129 writeNodeReference(OS, F->first);
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130 OS << " -> ";
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131 writeNodeReference(OS, F->second[I]);
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132 OS << ";\n";
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133 }
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134 }
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135 OS << "}\n";
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136 }
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137
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