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annotate tools/llvm-dis/llvm-dis.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 //===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
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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 utility may be invoked in the following manner:
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11 // llvm-dis [options] - Read LLVM bitcode from stdin, write asm to stdout
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12 // llvm-dis [options] x.bc - Read LLVM bitcode from the x.bc file, write asm
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13 // to the x.ll file.
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14 // Options:
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15 // --help - Output information about command line switches
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16 //
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17 //===----------------------------------------------------------------------===//
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18
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19 #include "llvm/IR/LLVMContext.h"
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20 #include "llvm/Assembly/AssemblyAnnotationWriter.h"
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21 #include "llvm/Bitcode/ReaderWriter.h"
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22 #include "llvm/DebugInfo.h"
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23 #include "llvm/IR/IntrinsicInst.h"
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24 #include "llvm/IR/Module.h"
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25 #include "llvm/IR/Type.h"
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26 #include "llvm/Support/CommandLine.h"
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27 #include "llvm/Support/DataStream.h"
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28 #include "llvm/Support/FormattedStream.h"
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29 #include "llvm/Support/ManagedStatic.h"
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30 #include "llvm/Support/MemoryBuffer.h"
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31 #include "llvm/Support/PrettyStackTrace.h"
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32 #include "llvm/Support/Signals.h"
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33 #include "llvm/Support/ToolOutputFile.h"
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34 #include "llvm/Support/system_error.h"
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35 using namespace llvm;
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36
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37 static cl::opt<std::string>
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38 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
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39
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40 static cl::opt<std::string>
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41 OutputFilename("o", cl::desc("Override output filename"),
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42 cl::value_desc("filename"));
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43
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44 static cl::opt<bool>
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45 Force("f", cl::desc("Enable binary output on terminals"));
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46
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47 static cl::opt<bool>
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48 DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
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49
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50 static cl::opt<bool>
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51 ShowAnnotations("show-annotations",
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52 cl::desc("Add informational comments to the .ll file"));
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53
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54 namespace {
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55
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56 static void printDebugLoc(const DebugLoc &DL, formatted_raw_ostream &OS) {
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57 OS << DL.getLine() << ":" << DL.getCol();
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58 if (MDNode *N = DL.getInlinedAt(getGlobalContext())) {
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59 DebugLoc IDL = DebugLoc::getFromDILocation(N);
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60 if (!IDL.isUnknown()) {
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61 OS << "@";
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62 printDebugLoc(IDL,OS);
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63 }
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64 }
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65 }
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66 class CommentWriter : public AssemblyAnnotationWriter {
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67 public:
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68 void emitFunctionAnnot(const Function *F,
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69 formatted_raw_ostream &OS) {
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70 OS << "; [#uses=" << F->getNumUses() << ']'; // Output # uses
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71 OS << '\n';
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72 }
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73 void printInfoComment(const Value &V, formatted_raw_ostream &OS) {
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74 bool Padded = false;
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75 if (!V.getType()->isVoidTy()) {
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76 OS.PadToColumn(50);
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77 Padded = true;
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78 OS << "; [#uses=" << V.getNumUses() << " type=" << *V.getType() << "]"; // Output # uses and type
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79 }
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80 if (const Instruction *I = dyn_cast<Instruction>(&V)) {
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81 const DebugLoc &DL = I->getDebugLoc();
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82 if (!DL.isUnknown()) {
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83 if (!Padded) {
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84 OS.PadToColumn(50);
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85 Padded = true;
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86 OS << ";";
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87 }
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88 OS << " [debug line = ";
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89 printDebugLoc(DL,OS);
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90 OS << "]";
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91 }
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92 if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(I)) {
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93 DIVariable Var(DDI->getVariable());
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94 if (!Padded) {
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95 OS.PadToColumn(50);
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96 OS << ";";
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97 }
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98 OS << " [debug variable = " << Var.getName() << "]";
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99 }
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100 else if (const DbgValueInst *DVI = dyn_cast<DbgValueInst>(I)) {
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101 DIVariable Var(DVI->getVariable());
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102 if (!Padded) {
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103 OS.PadToColumn(50);
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104 OS << ";";
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105 }
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106 OS << " [debug variable = " << Var.getName() << "]";
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107 }
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108 }
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109 }
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110 };
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111
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112 } // end anon namespace
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113
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114 int main(int argc, char **argv) {
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115 // Print a stack trace if we signal out.
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116 sys::PrintStackTraceOnErrorSignal();
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117 PrettyStackTraceProgram X(argc, argv);
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118
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119 LLVMContext &Context = getGlobalContext();
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120 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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121
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122
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123 cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
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124
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125 std::string ErrorMessage;
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126 OwningPtr<Module> M;
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127
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128 // Use the bitcode streaming interface
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129 DataStreamer *streamer = getDataFileStreamer(InputFilename, &ErrorMessage);
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130 if (streamer) {
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131 std::string DisplayFilename;
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132 if (InputFilename == "-")
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133 DisplayFilename = "<stdin>";
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134 else
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135 DisplayFilename = InputFilename;
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136 M.reset(getStreamedBitcodeModule(DisplayFilename, streamer, Context,
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137 &ErrorMessage));
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138 if(M.get() != 0 && M->MaterializeAllPermanently(&ErrorMessage)) {
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139 M.reset();
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140 }
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141 }
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142
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143 if (M.get() == 0) {
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144 errs() << argv[0] << ": ";
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145 if (ErrorMessage.size())
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146 errs() << ErrorMessage << "\n";
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147 else
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148 errs() << "bitcode didn't read correctly.\n";
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149 return 1;
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150 }
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151
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152 // Just use stdout. We won't actually print anything on it.
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153 if (DontPrint)
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154 OutputFilename = "-";
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155
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156 if (OutputFilename.empty()) { // Unspecified output, infer it.
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157 if (InputFilename == "-") {
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158 OutputFilename = "-";
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159 } else {
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160 const std::string &IFN = InputFilename;
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161 int Len = IFN.length();
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162 // If the source ends in .bc, strip it off.
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163 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c')
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164 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
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165 else
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166 OutputFilename = IFN+".ll";
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167 }
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168 }
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169
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170 std::string ErrorInfo;
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171 OwningPtr<tool_output_file>
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172 Out(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
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173 raw_fd_ostream::F_Binary));
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174 if (!ErrorInfo.empty()) {
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175 errs() << ErrorInfo << '\n';
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176 return 1;
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177 }
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178
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179 OwningPtr<AssemblyAnnotationWriter> Annotator;
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180 if (ShowAnnotations)
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181 Annotator.reset(new CommentWriter());
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182
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183 // All that llvm-dis does is write the assembly to a file.
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184 if (!DontPrint)
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185 M->print(Out->os(), Annotator.get());
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186
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187 // Declare success.
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188 Out->keep();
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189
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190 return 0;
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191 }