annotate tools/clang/lib/Frontend/DependencyGraph.cpp @ 0:95c75e76d11b LLVM3.4

LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===--- DependencyGraph.cpp - Generate dependency file -------------------===//
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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 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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14
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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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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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49 virtual void InclusionDirective(SourceLocation HashLoc,
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50 const Token &IncludeTok,
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51 StringRef FileName,
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52 bool IsAngled,
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53 CharSourceRange FilenameRange,
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54 const FileEntry *File,
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55 StringRef SearchPath,
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56 StringRef RelativePath,
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57 const Module *Imported);
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58
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59 virtual void EndOfMainFile() {
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60 OutputGraphFile();
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61 }
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62
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63 };
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64 }
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65
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66 void clang::AttachDependencyGraphGen(Preprocessor &PP, StringRef OutputFile,
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67 StringRef SysRoot) {
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68 PP.addPPCallbacks(new DependencyGraphCallback(&PP, OutputFile, SysRoot));
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69 }
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70
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71 void DependencyGraphCallback::InclusionDirective(SourceLocation HashLoc,
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72 const Token &IncludeTok,
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73 StringRef FileName,
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74 bool IsAngled,
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75 CharSourceRange FilenameRange,
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76 const FileEntry *File,
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77 StringRef SearchPath,
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78 StringRef RelativePath,
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79 const Module *Imported) {
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80 if (!File)
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81 return;
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82
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83 SourceManager &SM = PP->getSourceManager();
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84 const FileEntry *FromFile
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85 = SM.getFileEntryForID(SM.getFileID(SM.getExpansionLoc(HashLoc)));
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86 if (FromFile == 0)
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87 return;
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88
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89 Dependencies[FromFile].push_back(File);
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90
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91 AllFiles.insert(File);
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92 AllFiles.insert(FromFile);
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93 }
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94
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95 raw_ostream &
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96 DependencyGraphCallback::writeNodeReference(raw_ostream &OS,
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97 const FileEntry *Node) {
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98 OS << "header_" << Node->getUID();
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99 return OS;
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100 }
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101
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102 void DependencyGraphCallback::OutputGraphFile() {
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103 std::string Err;
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104 llvm::raw_fd_ostream OS(OutputFile.c_str(), Err);
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105 if (!Err.empty()) {
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106 PP->getDiagnostics().Report(diag::err_fe_error_opening)
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107 << OutputFile << Err;
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108 return;
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109 }
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110
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111 OS << "digraph \"dependencies\" {\n";
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112
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113 // Write the nodes
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114 for (unsigned I = 0, N = AllFiles.size(); I != N; ++I) {
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115 // Write the node itself.
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116 OS.indent(2);
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117 writeNodeReference(OS, AllFiles[I]);
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118 OS << " [ shape=\"box\", label=\"";
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119 StringRef FileName = AllFiles[I]->getName();
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120 if (FileName.startswith(SysRoot))
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121 FileName = FileName.substr(SysRoot.size());
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122
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123 OS << DOT::EscapeString(FileName)
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124 << "\"];\n";
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125 }
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126
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127 // Write the edges
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128 for (DependencyMap::iterator F = Dependencies.begin(),
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129 FEnd = Dependencies.end();
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130 F != FEnd; ++F) {
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131 for (unsigned I = 0, N = F->second.size(); I != N; ++I) {
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132 OS.indent(2);
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133 writeNodeReference(OS, F->first);
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134 OS << " -> ";
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 writeNodeReference(OS, F->second[I]);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 OS << ";\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 OS << "}\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141