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annotate include/llvm/Support/FormattedStream.h @ 125:56c5119fbcd2

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fix
author mir3636
date Sun, 03 Dec 2017 20:09:16 +0900
parents afa8332a0e37
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 /// TheStream - The real stream we output to. We set it to be
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29 /// unbuffered, since we're already doing our own buffering.
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30 ///
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31 raw_ostream *TheStream;
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32
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33 /// Position - The current output column and line of the data that's
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34 /// been flushed and the portion of the buffer that's been
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35 /// scanned. The line and column scheme is zero-based.
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36 ///
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37 std::pair<unsigned, unsigned> Position;
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38
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39 /// Scanned - This points to one past the last character in the
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40 /// buffer we've scanned.
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41 ///
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42 const char *Scanned;
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43
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44 void write_impl(const char *Ptr, size_t Size) override;
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45
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46 /// current_pos - Return the current position within the stream,
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47 /// not counting the bytes currently in the buffer.
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48 uint64_t current_pos() const override {
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49 // Our current position in the stream is all the contents which have been
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50 // written to the underlying stream (*not* the current position of the
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51 // underlying stream).
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52 return TheStream->tell();
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53 }
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54
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55 /// ComputePosition - Examine the given output buffer and figure out the new
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56 /// position after output.
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57 ///
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58 void ComputePosition(const char *Ptr, size_t size);
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59
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60 void setStream(raw_ostream &Stream) {
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61 releaseStream();
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62
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63 TheStream = &Stream;
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64
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65 // This formatted_raw_ostream inherits from raw_ostream, so it'll do its
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66 // own buffering, and it doesn't need or want TheStream to do another
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67 // layer of buffering underneath. Resize the buffer to what TheStream
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68 // had been using, and tell TheStream not to do its own buffering.
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69 if (size_t BufferSize = TheStream->GetBufferSize())
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70 SetBufferSize(BufferSize);
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71 else
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72 SetUnbuffered();
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73 TheStream->SetUnbuffered();
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74
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75 Scanned = nullptr;
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76 }
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78 public:
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79 /// formatted_raw_ostream - Open the specified file for
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80 /// writing. If an error occurs, information about the error is
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81 /// put into ErrorInfo, and the stream should be immediately
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82 /// destroyed; the string will be empty if no error occurred.
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83 ///
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84 /// As a side effect, the given Stream is set to be Unbuffered.
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85 /// This is because formatted_raw_ostream does its own buffering,
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86 /// so it doesn't want another layer of buffering to be happening
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87 /// underneath it.
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88 ///
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89 formatted_raw_ostream(raw_ostream &Stream)
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90 : TheStream(nullptr), Position(0, 0) {
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91 setStream(Stream);
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92 }
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93 explicit formatted_raw_ostream() : TheStream(nullptr), Position(0, 0) {
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94 Scanned = nullptr;
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95 }
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96
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97 ~formatted_raw_ostream() override {
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98 flush();
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99 releaseStream();
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100 }
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101
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102 /// PadToColumn - Align the output to some column number. If the current
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103 /// column is already equal to or more than NewCol, PadToColumn inserts one
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104 /// space.
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105 ///
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106 /// \param NewCol - The column to move to.
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107 formatted_raw_ostream &PadToColumn(unsigned NewCol);
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108
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109 /// getColumn - Return the column number
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110 unsigned getColumn() { return Position.first; }
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111
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112 /// getLine - Return the line number
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113 unsigned getLine() { return Position.second; }
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114
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115 raw_ostream &resetColor() override {
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116 TheStream->resetColor();
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117 return *this;
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118 }
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119
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120 raw_ostream &reverseColor() override {
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121 TheStream->reverseColor();
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122 return *this;
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123 }
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124
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125 raw_ostream &changeColor(enum Colors Color, bool Bold, bool BG) override {
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126 TheStream->changeColor(Color, Bold, BG);
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127 return *this;
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128 }
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129
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130 bool is_displayed() const override {
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131 return TheStream->is_displayed();
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132 }
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133
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134 private:
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135 void releaseStream() {
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136 // Transfer the buffer settings from this raw_ostream back to the underlying
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137 // stream.
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138 if (!TheStream)
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139 return;
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140 if (size_t BufferSize = GetBufferSize())
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141 TheStream->SetBufferSize(BufferSize);
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142 else
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143 TheStream->SetUnbuffered();
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144 }
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145 };
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146
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147 /// fouts() - This returns a reference to a formatted_raw_ostream for
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148 /// standard output. Use it like: fouts() << "foo" << "bar";
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149 formatted_raw_ostream &fouts();
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150
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151 /// ferrs() - This returns a reference to a formatted_raw_ostream for
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152 /// standard error. Use it like: ferrs() << "foo" << "bar";
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153 formatted_raw_ostream &ferrs();
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154
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155 /// fdbgs() - This returns a reference to a formatted_raw_ostream for
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156 /// debug output. Use it like: fdbgs() << "foo" << "bar";
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157 formatted_raw_ostream &fdbgs();
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158
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159 } // end llvm namespace
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160
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161
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162 #endif