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annotate include/llvm/Support/FormattedStream.h @ 77:54457678186b

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children afa8332a0e37
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1 //===-- llvm/Support/FormattedStream.h - Formatted streams ------*- 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 contains raw_ostream implementations for streams to do
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11 // things like pretty-print comments.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_SUPPORT_FORMATTEDSTREAM_H
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16 #define LLVM_SUPPORT_FORMATTEDSTREAM_H
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17
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18 #include "llvm/Support/raw_ostream.h"
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19 #include <utility>
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20
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21 namespace llvm {
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22
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23 /// formatted_raw_ostream - A raw_ostream that wraps another one and keeps track
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24 /// of line and column position, allowing padding out to specific column
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25 /// boundaries and querying the number of lines written to the stream.
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26 ///
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27 class formatted_raw_ostream : public raw_ostream {
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28 public:
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29 /// DELETE_STREAM - Tell the destructor to delete the held stream.
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30 ///
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31 static const bool DELETE_STREAM = true;
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32
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33 /// PRESERVE_STREAM - Tell the destructor to not delete the held
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34 /// stream.
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35 ///
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36 static const bool PRESERVE_STREAM = false;
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37
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38 private:
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39 /// TheStream - The real stream we output to. We set it to be
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40 /// unbuffered, since we're already doing our own buffering.
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41 ///
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42 raw_ostream *TheStream;
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43
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44 /// DeleteStream - Do we need to delete TheStream in the
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45 /// destructor?
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46 ///
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47 bool DeleteStream;
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48
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49 /// Position - The current output column and line of the data that's
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50 /// been flushed and the portion of the buffer that's been
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51 /// scanned. The line and column scheme is zero-based.
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52 ///
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53 std::pair<unsigned, unsigned> Position;
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54
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55 /// Scanned - This points to one past the last character in the
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56 /// buffer we've scanned.
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57 ///
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58 const char *Scanned;
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59
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60 void write_impl(const char *Ptr, size_t Size) override;
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61
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62 /// current_pos - Return the current position within the stream,
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63 /// not counting the bytes currently in the buffer.
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64 uint64_t current_pos() const override {
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65 // Our current position in the stream is all the contents which have been
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66 // written to the underlying stream (*not* the current position of the
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67 // underlying stream).
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68 return TheStream->tell();
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69 }
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70
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71 /// ComputePosition - Examine the given output buffer and figure out the new
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72 /// position after output.
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73 ///
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74 void ComputePosition(const char *Ptr, size_t size);
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75
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76 public:
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77 /// formatted_raw_ostream - Open the specified file for
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78 /// writing. If an error occurs, information about the error is
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79 /// put into ErrorInfo, and the stream should be immediately
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80 /// destroyed; the string will be empty if no error occurred.
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81 ///
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82 /// As a side effect, the given Stream is set to be Unbuffered.
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83 /// This is because formatted_raw_ostream does its own buffering,
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84 /// so it doesn't want another layer of buffering to be happening
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85 /// underneath it.
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86 ///
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87 formatted_raw_ostream(raw_ostream &Stream, bool Delete = false)
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88 : raw_ostream(), TheStream(nullptr), DeleteStream(false), Position(0, 0) {
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89 setStream(Stream, Delete);
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90 }
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91 explicit formatted_raw_ostream()
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92 : raw_ostream(), TheStream(nullptr), DeleteStream(false), Position(0, 0) {
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93 Scanned = nullptr;
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94 }
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95
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96 ~formatted_raw_ostream() {
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97 flush();
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98 releaseStream();
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99 }
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100
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101 void setStream(raw_ostream &Stream, bool Delete = false) {
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102 releaseStream();
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103
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104 TheStream = &Stream;
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105 DeleteStream = Delete;
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106
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107 // This formatted_raw_ostream inherits from raw_ostream, so it'll do its
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108 // own buffering, and it doesn't need or want TheStream to do another
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109 // layer of buffering underneath. Resize the buffer to what TheStream
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110 // had been using, and tell TheStream not to do its own buffering.
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111 if (size_t BufferSize = TheStream->GetBufferSize())
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112 SetBufferSize(BufferSize);
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113 else
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114 SetUnbuffered();
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115 TheStream->SetUnbuffered();
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116
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117 Scanned = nullptr;
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118 }
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119
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120 /// PadToColumn - Align the output to some column number. If the current
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121 /// column is already equal to or more than NewCol, PadToColumn inserts one
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122 /// space.
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123 ///
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124 /// \param NewCol - The column to move to.
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125 formatted_raw_ostream &PadToColumn(unsigned NewCol);
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126
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127 /// getColumn - Return the column number
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128 unsigned getColumn() { return Position.first; }
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129
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130 /// getLine - Return the line number
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131 unsigned getLine() { return Position.second; }
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132
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133 raw_ostream &resetColor() override {
0
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134 TheStream->resetColor();
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135 return *this;
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136 }
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137
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138 raw_ostream &reverseColor() override {
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139 TheStream->reverseColor();
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140 return *this;
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141 }
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142
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143 raw_ostream &changeColor(enum Colors Color, bool Bold, bool BG) override {
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144 TheStream->changeColor(Color, Bold, BG);
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145 return *this;
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146 }
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147
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148 bool is_displayed() const override {
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149 return TheStream->is_displayed();
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150 }
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151
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152 private:
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153 void releaseStream() {
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154 // Delete the stream if needed. Otherwise, transfer the buffer
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155 // settings from this raw_ostream back to the underlying stream.
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156 if (!TheStream)
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157 return;
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158 if (DeleteStream)
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159 delete TheStream;
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160 else if (size_t BufferSize = GetBufferSize())
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161 TheStream->SetBufferSize(BufferSize);
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162 else
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163 TheStream->SetUnbuffered();
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164 }
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165 };
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166
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167 /// fouts() - This returns a reference to a formatted_raw_ostream for
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168 /// standard output. Use it like: fouts() << "foo" << "bar";
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169 formatted_raw_ostream &fouts();
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170
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171 /// ferrs() - This returns a reference to a formatted_raw_ostream for
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172 /// standard error. Use it like: ferrs() << "foo" << "bar";
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173 formatted_raw_ostream &ferrs();
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174
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175 /// fdbgs() - This returns a reference to a formatted_raw_ostream for
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176 /// debug output. Use it like: fdbgs() << "foo" << "bar";
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177 formatted_raw_ostream &fdbgs();
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178
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179 } // end llvm namespace
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180
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181
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182 #endif