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annotate tools/clang/lib/Frontend/TextDiagnosticPrinter.cpp @ 3:9ad51c7bc036

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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Wed, 15 May 2013 06:43:32 +0900
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1 //===--- TextDiagnosticPrinter.cpp - Diagnostic Printer -------------------===//
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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 diagnostic client prints out their diagnostic messages.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "clang/Frontend/TextDiagnosticPrinter.h"
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15 #include "clang/Basic/DiagnosticOptions.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/TextDiagnostic.h"
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19 #include "clang/Lex/Lexer.h"
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20 #include "llvm/ADT/SmallString.h"
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21 #include "llvm/Support/ErrorHandling.h"
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22 #include "llvm/Support/MemoryBuffer.h"
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23 #include "llvm/Support/raw_ostream.h"
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24 #include <algorithm>
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25 using namespace clang;
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26
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27 TextDiagnosticPrinter::TextDiagnosticPrinter(raw_ostream &os,
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28 DiagnosticOptions *diags,
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29 bool _OwnsOutputStream)
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30 : OS(os), DiagOpts(diags),
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31 OwnsOutputStream(_OwnsOutputStream) {
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32 }
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33
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34 TextDiagnosticPrinter::~TextDiagnosticPrinter() {
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35 if (OwnsOutputStream)
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36 delete &OS;
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37 }
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38
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39 void TextDiagnosticPrinter::BeginSourceFile(const LangOptions &LO,
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40 const Preprocessor *PP) {
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41 // Build the TextDiagnostic utility.
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42 TextDiag.reset(new TextDiagnostic(OS, LO, &*DiagOpts));
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43 }
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44
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45 void TextDiagnosticPrinter::EndSourceFile() {
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46 TextDiag.reset(0);
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47 }
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48
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49 /// \brief Print any diagnostic option information to a raw_ostream.
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50 ///
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51 /// This implements all of the logic for adding diagnostic options to a message
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52 /// (via OS). Each relevant option is comma separated and all are enclosed in
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53 /// the standard bracketing: " [...]".
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54 static void printDiagnosticOptions(raw_ostream &OS,
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55 DiagnosticsEngine::Level Level,
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56 const Diagnostic &Info,
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57 const DiagnosticOptions &DiagOpts) {
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58 bool Started = false;
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59 if (DiagOpts.ShowOptionNames) {
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60 // Handle special cases for non-warnings early.
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61 if (Info.getID() == diag::fatal_too_many_errors) {
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62 OS << " [-ferror-limit=]";
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63 return;
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64 }
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65
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66 // The code below is somewhat fragile because we are essentially trying to
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67 // report to the user what happened by inferring what the diagnostic engine
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68 // did. Eventually it might make more sense to have the diagnostic engine
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69 // include some "why" information in the diagnostic.
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70
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71 // If this is a warning which has been mapped to an error by the user (as
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72 // inferred by checking whether the default mapping is to an error) then
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73 // flag it as such. Note that diagnostics could also have been mapped by a
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74 // pragma, but we don't currently have a way to distinguish this.
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75 if (Level == DiagnosticsEngine::Error &&
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76 DiagnosticIDs::isBuiltinWarningOrExtension(Info.getID()) &&
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77 !DiagnosticIDs::isDefaultMappingAsError(Info.getID())) {
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78 OS << " [-Werror";
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79 Started = true;
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80 }
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81
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82 StringRef Opt = DiagnosticIDs::getWarningOptionForDiag(Info.getID());
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83 if (!Opt.empty()) {
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84 OS << (Started ? "," : " [") << "-W" << Opt;
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85 Started = true;
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86 }
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87 }
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88
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89 // If the user wants to see category information, include it too.
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90 if (DiagOpts.ShowCategories) {
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91 unsigned DiagCategory =
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92 DiagnosticIDs::getCategoryNumberForDiag(Info.getID());
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93 if (DiagCategory) {
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94 OS << (Started ? "," : " [");
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95 Started = true;
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96 if (DiagOpts.ShowCategories == 1)
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97 OS << DiagCategory;
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98 else {
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99 assert(DiagOpts.ShowCategories == 2 && "Invalid ShowCategories value");
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100 OS << DiagnosticIDs::getCategoryNameFromID(DiagCategory);
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101 }
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102 }
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103 }
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104 if (Started)
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105 OS << ']';
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106 }
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107
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108 void TextDiagnosticPrinter::HandleDiagnostic(DiagnosticsEngine::Level Level,
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109 const Diagnostic &Info) {
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110 // Default implementation (Warnings/errors count).
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111 DiagnosticConsumer::HandleDiagnostic(Level, Info);
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112
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113 // Render the diagnostic message into a temporary buffer eagerly. We'll use
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114 // this later as we print out the diagnostic to the terminal.
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115 SmallString<100> OutStr;
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116 Info.FormatDiagnostic(OutStr);
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117
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118 llvm::raw_svector_ostream DiagMessageStream(OutStr);
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119 printDiagnosticOptions(DiagMessageStream, Level, Info, *DiagOpts);
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120
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121 // Keeps track of the starting position of the location
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122 // information (e.g., "foo.c:10:4:") that precedes the error
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123 // message. We use this information to determine how long the
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124 // file+line+column number prefix is.
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125 uint64_t StartOfLocationInfo = OS.tell();
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126
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127 if (!Prefix.empty())
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128 OS << Prefix << ": ";
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129
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130 // Use a dedicated, simpler path for diagnostics without a valid location.
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131 // This is important as if the location is missing, we may be emitting
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132 // diagnostics in a context that lacks language options, a source manager, or
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133 // other infrastructure necessary when emitting more rich diagnostics.
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134 if (!Info.getLocation().isValid()) {
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135 TextDiagnostic::printDiagnosticLevel(OS, Level, DiagOpts->ShowColors);
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136 TextDiagnostic::printDiagnosticMessage(OS, Level, DiagMessageStream.str(),
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137 OS.tell() - StartOfLocationInfo,
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138 DiagOpts->MessageLength,
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139 DiagOpts->ShowColors);
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140 OS.flush();
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141 return;
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142 }
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143
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144 // Assert that the rest of our infrastructure is setup properly.
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145 assert(DiagOpts && "Unexpected diagnostic without options set");
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146 assert(Info.hasSourceManager() &&
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147 "Unexpected diagnostic with no source manager");
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148 assert(TextDiag && "Unexpected diagnostic outside source file processing");
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149
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150 TextDiag->emitDiagnostic(Info.getLocation(), Level, DiagMessageStream.str(),
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151 Info.getRanges(),
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152 llvm::makeArrayRef(Info.getFixItHints(),
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153 Info.getNumFixItHints()),
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154 &Info.getSourceManager());
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155
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156 OS.flush();
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157 }