Mercurial > hg > CbC > CbC_llvm
annotate lib/Support/raw_ostream.cpp @ 21:fc4a6333556f
change error message when tail call elimination is failed.
author | Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> |
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date | Mon, 14 Oct 2013 19:09:00 +0900 |
parents | 9ad51c7bc036 |
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rev | line source |
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3
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1 //===--- raw_ostream.cpp - Implement the raw_ostream classes --------------===// |
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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 implements support for bulk buffered stream output. |
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11 // |
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12 //===----------------------------------------------------------------------===// |
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13 |
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14 #include "llvm/Support/raw_ostream.h" |
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15 #include "llvm/ADT/STLExtras.h" |
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16 #include "llvm/ADT/SmallVector.h" |
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17 #include "llvm/ADT/StringExtras.h" |
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18 #include "llvm/Config/config.h" |
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19 #include "llvm/Support/Compiler.h" |
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20 #include "llvm/Support/ErrorHandling.h" |
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21 #include "llvm/Support/Format.h" |
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22 #include "llvm/Support/Process.h" |
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23 #include "llvm/Support/Program.h" |
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24 #include "llvm/Support/system_error.h" |
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25 #include <cctype> |
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26 #include <cerrno> |
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27 #include <sys/stat.h> |
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28 #include <sys/types.h> |
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29 |
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30 #if defined(HAVE_UNISTD_H) |
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31 # include <unistd.h> |
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32 #endif |
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33 #if defined(HAVE_FCNTL_H) |
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34 # include <fcntl.h> |
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35 #endif |
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36 #if defined(HAVE_SYS_UIO_H) && defined(HAVE_WRITEV) |
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37 # include <sys/uio.h> |
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38 #endif |
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39 |
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40 #if defined(__CYGWIN__) |
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41 #include <io.h> |
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42 #endif |
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43 |
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44 #if defined(_MSC_VER) |
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45 #include <io.h> |
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46 #include <fcntl.h> |
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47 #ifndef STDIN_FILENO |
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48 # define STDIN_FILENO 0 |
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49 #endif |
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50 #ifndef STDOUT_FILENO |
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51 # define STDOUT_FILENO 1 |
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52 #endif |
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53 #ifndef STDERR_FILENO |
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54 # define STDERR_FILENO 2 |
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55 #endif |
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56 #endif |
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57 |
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58 using namespace llvm; |
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59 |
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60 raw_ostream::~raw_ostream() { |
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61 // raw_ostream's subclasses should take care to flush the buffer |
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62 // in their destructors. |
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63 assert(OutBufCur == OutBufStart && |
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64 "raw_ostream destructor called with non-empty buffer!"); |
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65 |
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66 if (BufferMode == InternalBuffer) |
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67 delete [] OutBufStart; |
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68 } |
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69 |
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70 // An out of line virtual method to provide a home for the class vtable. |
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71 void raw_ostream::handle() {} |
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72 |
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73 size_t raw_ostream::preferred_buffer_size() const { |
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74 // BUFSIZ is intended to be a reasonable default. |
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75 return BUFSIZ; |
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76 } |
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77 |
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78 void raw_ostream::SetBuffered() { |
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79 // Ask the subclass to determine an appropriate buffer size. |
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80 if (size_t Size = preferred_buffer_size()) |
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81 SetBufferSize(Size); |
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82 else |
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83 // It may return 0, meaning this stream should be unbuffered. |
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84 SetUnbuffered(); |
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85 } |
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86 |
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87 void raw_ostream::SetBufferAndMode(char *BufferStart, size_t Size, |
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88 BufferKind Mode) { |
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89 assert(((Mode == Unbuffered && BufferStart == 0 && Size == 0) || |
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90 (Mode != Unbuffered && BufferStart && Size)) && |
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91 "stream must be unbuffered or have at least one byte"); |
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92 // Make sure the current buffer is free of content (we can't flush here; the |
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93 // child buffer management logic will be in write_impl). |
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94 assert(GetNumBytesInBuffer() == 0 && "Current buffer is non-empty!"); |
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95 |
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96 if (BufferMode == InternalBuffer) |
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97 delete [] OutBufStart; |
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98 OutBufStart = BufferStart; |
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99 OutBufEnd = OutBufStart+Size; |
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100 OutBufCur = OutBufStart; |
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101 BufferMode = Mode; |
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102 |
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103 assert(OutBufStart <= OutBufEnd && "Invalid size!"); |
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104 } |
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105 |
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106 raw_ostream &raw_ostream::operator<<(unsigned long N) { |
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107 // Zero is a special case. |
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108 if (N == 0) |
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109 return *this << '0'; |
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110 |
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111 char NumberBuffer[20]; |
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112 char *EndPtr = NumberBuffer+sizeof(NumberBuffer); |
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113 char *CurPtr = EndPtr; |
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114 |
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115 while (N) { |
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116 *--CurPtr = '0' + char(N % 10); |
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117 N /= 10; |
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118 } |
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119 return write(CurPtr, EndPtr-CurPtr); |
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120 } |
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121 |
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122 raw_ostream &raw_ostream::operator<<(long N) { |
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123 if (N < 0) { |
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124 *this << '-'; |
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125 // Avoid undefined behavior on LONG_MIN with a cast. |
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126 N = -(unsigned long)N; |
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127 } |
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128 |
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129 return this->operator<<(static_cast<unsigned long>(N)); |
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130 } |
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131 |
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132 raw_ostream &raw_ostream::operator<<(unsigned long long N) { |
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133 // Output using 32-bit div/mod when possible. |
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134 if (N == static_cast<unsigned long>(N)) |
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135 return this->operator<<(static_cast<unsigned long>(N)); |
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136 |
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137 char NumberBuffer[20]; |
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138 char *EndPtr = NumberBuffer+sizeof(NumberBuffer); |
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139 char *CurPtr = EndPtr; |
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140 |
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141 while (N) { |
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142 *--CurPtr = '0' + char(N % 10); |
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143 N /= 10; |
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144 } |
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145 return write(CurPtr, EndPtr-CurPtr); |
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146 } |
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147 |
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148 raw_ostream &raw_ostream::operator<<(long long N) { |
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149 if (N < 0) { |
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150 *this << '-'; |
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151 // Avoid undefined behavior on INT64_MIN with a cast. |
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152 N = -(unsigned long long)N; |
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153 } |
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154 |
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155 return this->operator<<(static_cast<unsigned long long>(N)); |
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156 } |
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157 |
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158 raw_ostream &raw_ostream::write_hex(unsigned long long N) { |
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159 // Zero is a special case. |
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160 if (N == 0) |
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161 return *this << '0'; |
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162 |
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163 char NumberBuffer[20]; |
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164 char *EndPtr = NumberBuffer+sizeof(NumberBuffer); |
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165 char *CurPtr = EndPtr; |
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166 |
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167 while (N) { |
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168 uintptr_t x = N % 16; |
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169 *--CurPtr = (x < 10 ? '0' + x : 'a' + x - 10); |
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170 N /= 16; |
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171 } |
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172 |
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173 return write(CurPtr, EndPtr-CurPtr); |
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174 } |
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175 |
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176 raw_ostream &raw_ostream::write_escaped(StringRef Str, |
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177 bool UseHexEscapes) { |
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178 for (unsigned i = 0, e = Str.size(); i != e; ++i) { |
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179 unsigned char c = Str[i]; |
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180 |
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181 switch (c) { |
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182 case '\\': |
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183 *this << '\\' << '\\'; |
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184 break; |
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185 case '\t': |
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186 *this << '\\' << 't'; |
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187 break; |
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188 case '\n': |
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189 *this << '\\' << 'n'; |
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190 break; |
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191 case '"': |
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192 *this << '\\' << '"'; |
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193 break; |
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194 default: |
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195 if (std::isprint(c)) { |
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196 *this << c; |
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197 break; |
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198 } |
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199 |
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200 // Write out the escaped representation. |
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201 if (UseHexEscapes) { |
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202 *this << '\\' << 'x'; |
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203 *this << hexdigit((c >> 4 & 0xF)); |
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204 *this << hexdigit((c >> 0) & 0xF); |
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205 } else { |
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206 // Always use a full 3-character octal escape. |
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207 *this << '\\'; |
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208 *this << char('0' + ((c >> 6) & 7)); |
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209 *this << char('0' + ((c >> 3) & 7)); |
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210 *this << char('0' + ((c >> 0) & 7)); |
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211 } |
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212 } |
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213 } |
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214 |
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215 return *this; |
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216 } |
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217 |
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218 raw_ostream &raw_ostream::operator<<(const void *P) { |
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219 *this << '0' << 'x'; |
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220 |
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221 return write_hex((uintptr_t) P); |
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222 } |
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223 |
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224 raw_ostream &raw_ostream::operator<<(double N) { |
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225 #ifdef _WIN32 |
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226 // On MSVCRT and compatible, output of %e is incompatible to Posix |
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227 // by default. Number of exponent digits should be at least 2. "%+03d" |
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228 // FIXME: Implement our formatter to here or Support/Format.h! |
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229 int fpcl = _fpclass(N); |
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230 |
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231 // negative zero |
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232 if (fpcl == _FPCLASS_NZ) |
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233 return *this << "-0.000000e+00"; |
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234 |
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235 char buf[16]; |
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236 unsigned len; |
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237 len = snprintf(buf, sizeof(buf), "%e", N); |
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238 if (len <= sizeof(buf) - 2) { |
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239 if (len >= 5 && buf[len - 5] == 'e' && buf[len - 3] == '0') { |
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240 int cs = buf[len - 4]; |
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241 if (cs == '+' || cs == '-') { |
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242 int c1 = buf[len - 2]; |
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243 int c0 = buf[len - 1]; |
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244 if (isdigit(static_cast<unsigned char>(c1)) && |
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245 isdigit(static_cast<unsigned char>(c0))) { |
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246 // Trim leading '0': "...e+012" -> "...e+12\0" |
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247 buf[len - 3] = c1; |
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248 buf[len - 2] = c0; |
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249 buf[--len] = 0; |
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250 } |
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251 } |
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252 } |
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253 return this->operator<<(buf); |
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254 } |
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255 #endif |
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256 return this->operator<<(format("%e", N)); |
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257 } |
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258 |
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259 |
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260 |
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261 void raw_ostream::flush_nonempty() { |
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262 assert(OutBufCur > OutBufStart && "Invalid call to flush_nonempty."); |
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263 size_t Length = OutBufCur - OutBufStart; |
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264 OutBufCur = OutBufStart; |
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265 write_impl(OutBufStart, Length); |
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266 } |
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267 |
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268 raw_ostream &raw_ostream::write(unsigned char C) { |
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269 // Group exceptional cases into a single branch. |
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270 if (LLVM_UNLIKELY(OutBufCur >= OutBufEnd)) { |
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271 if (LLVM_UNLIKELY(!OutBufStart)) { |
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272 if (BufferMode == Unbuffered) { |
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273 write_impl(reinterpret_cast<char*>(&C), 1); |
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274 return *this; |
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275 } |
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276 // Set up a buffer and start over. |
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277 SetBuffered(); |
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278 return write(C); |
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279 } |
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280 |
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281 flush_nonempty(); |
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282 } |
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283 |
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284 *OutBufCur++ = C; |
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285 return *this; |
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286 } |
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287 |
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288 raw_ostream &raw_ostream::write(const char *Ptr, size_t Size) { |
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289 // Group exceptional cases into a single branch. |
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290 if (LLVM_UNLIKELY(size_t(OutBufEnd - OutBufCur) < Size)) { |
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291 if (LLVM_UNLIKELY(!OutBufStart)) { |
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292 if (BufferMode == Unbuffered) { |
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293 write_impl(Ptr, Size); |
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294 return *this; |
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295 } |
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296 // Set up a buffer and start over. |
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297 SetBuffered(); |
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298 return write(Ptr, Size); |
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299 } |
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300 |
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301 size_t NumBytes = OutBufEnd - OutBufCur; |
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302 |
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303 // If the buffer is empty at this point we have a string that is larger |
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304 // than the buffer. Directly write the chunk that is a multiple of the |
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305 // preferred buffer size and put the remainder in the buffer. |
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306 if (LLVM_UNLIKELY(OutBufCur == OutBufStart)) { |
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307 size_t BytesToWrite = Size - (Size % NumBytes); |
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308 write_impl(Ptr, BytesToWrite); |
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309 size_t BytesRemaining = Size - BytesToWrite; |
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310 if (BytesRemaining > size_t(OutBufEnd - OutBufCur)) { |
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311 // Too much left over to copy into our buffer. |
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312 return write(Ptr + BytesToWrite, BytesRemaining); |
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313 } |
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314 copy_to_buffer(Ptr + BytesToWrite, BytesRemaining); |
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315 return *this; |
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316 } |
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317 |
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318 // We don't have enough space in the buffer to fit the string in. Insert as |
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319 // much as possible, flush and start over with the remainder. |
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320 copy_to_buffer(Ptr, NumBytes); |
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321 flush_nonempty(); |
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322 return write(Ptr + NumBytes, Size - NumBytes); |
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323 } |
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324 |
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325 copy_to_buffer(Ptr, Size); |
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326 |
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327 return *this; |
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328 } |
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329 |
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330 void raw_ostream::copy_to_buffer(const char *Ptr, size_t Size) { |
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331 assert(Size <= size_t(OutBufEnd - OutBufCur) && "Buffer overrun!"); |
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332 |
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333 // Handle short strings specially, memcpy isn't very good at very short |
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334 // strings. |
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335 switch (Size) { |
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336 case 4: OutBufCur[3] = Ptr[3]; // FALL THROUGH |
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337 case 3: OutBufCur[2] = Ptr[2]; // FALL THROUGH |
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338 case 2: OutBufCur[1] = Ptr[1]; // FALL THROUGH |
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339 case 1: OutBufCur[0] = Ptr[0]; // FALL THROUGH |
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340 case 0: break; |
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341 default: |
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342 memcpy(OutBufCur, Ptr, Size); |
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343 break; |
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344 } |
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345 |
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346 OutBufCur += Size; |
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347 } |
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348 |
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349 // Formatted output. |
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350 raw_ostream &raw_ostream::operator<<(const format_object_base &Fmt) { |
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351 // If we have more than a few bytes left in our output buffer, try |
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352 // formatting directly onto its end. |
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353 size_t NextBufferSize = 127; |
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354 size_t BufferBytesLeft = OutBufEnd - OutBufCur; |
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355 if (BufferBytesLeft > 3) { |
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356 size_t BytesUsed = Fmt.print(OutBufCur, BufferBytesLeft); |
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357 |
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358 // Common case is that we have plenty of space. |
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359 if (BytesUsed <= BufferBytesLeft) { |
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360 OutBufCur += BytesUsed; |
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361 return *this; |
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362 } |
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363 |
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364 // Otherwise, we overflowed and the return value tells us the size to try |
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365 // again with. |
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366 NextBufferSize = BytesUsed; |
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367 } |
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368 |
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369 // If we got here, we didn't have enough space in the output buffer for the |
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370 // string. Try printing into a SmallVector that is resized to have enough |
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371 // space. Iterate until we win. |
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372 SmallVector<char, 128> V; |
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373 |
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374 while (1) { |
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375 V.resize(NextBufferSize); |
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376 |
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377 // Try formatting into the SmallVector. |
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378 size_t BytesUsed = Fmt.print(V.data(), NextBufferSize); |
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379 |
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380 // If BytesUsed fit into the vector, we win. |
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381 if (BytesUsed <= NextBufferSize) |
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382 return write(V.data(), BytesUsed); |
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383 |
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384 // Otherwise, try again with a new size. |
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385 assert(BytesUsed > NextBufferSize && "Didn't grow buffer!?"); |
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386 NextBufferSize = BytesUsed; |
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387 } |
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388 } |
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389 |
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390 /// indent - Insert 'NumSpaces' spaces. |
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391 raw_ostream &raw_ostream::indent(unsigned NumSpaces) { |
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392 static const char Spaces[] = " " |
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393 " " |
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394 " "; |
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395 |
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396 // Usually the indentation is small, handle it with a fastpath. |
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397 if (NumSpaces < array_lengthof(Spaces)) |
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398 return write(Spaces, NumSpaces); |
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399 |
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400 while (NumSpaces) { |
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401 unsigned NumToWrite = std::min(NumSpaces, |
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402 (unsigned)array_lengthof(Spaces)-1); |
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403 write(Spaces, NumToWrite); |
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404 NumSpaces -= NumToWrite; |
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405 } |
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406 return *this; |
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407 } |
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408 |
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409 |
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410 //===----------------------------------------------------------------------===// |
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411 // Formatted Output |
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412 //===----------------------------------------------------------------------===// |
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413 |
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414 // Out of line virtual method. |
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415 void format_object_base::home() { |
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416 } |
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417 |
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418 //===----------------------------------------------------------------------===// |
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419 // raw_fd_ostream |
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420 //===----------------------------------------------------------------------===// |
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421 |
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422 /// raw_fd_ostream - Open the specified file for writing. If an error |
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423 /// occurs, information about the error is put into ErrorInfo, and the |
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424 /// stream should be immediately destroyed; the string will be empty |
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425 /// if no error occurred. |
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426 raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo, |
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427 unsigned Flags) |
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428 : Error(false), UseAtomicWrites(false), pos(0) |
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429 { |
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430 assert(Filename != 0 && "Filename is null"); |
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431 // Verify that we don't have both "append" and "excl". |
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432 assert((!(Flags & F_Excl) || !(Flags & F_Append)) && |
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433 "Cannot specify both 'excl' and 'append' file creation flags!"); |
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434 |
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435 ErrorInfo.clear(); |
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436 |
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437 // Handle "-" as stdout. Note that when we do this, we consider ourself |
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438 // the owner of stdout. This means that we can do things like close the |
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439 // file descriptor when we're done and set the "binary" flag globally. |
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440 if (Filename[0] == '-' && Filename[1] == 0) { |
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441 FD = STDOUT_FILENO; |
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442 // If user requested binary then put stdout into binary mode if |
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443 // possible. |
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444 if (Flags & F_Binary) |
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445 sys::Program::ChangeStdoutToBinary(); |
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446 // Close stdout when we're done, to detect any output errors. |
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447 ShouldClose = true; |
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448 return; |
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449 } |
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450 |
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451 int OpenFlags = O_WRONLY|O_CREAT; |
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452 #ifdef O_BINARY |
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453 if (Flags & F_Binary) |
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454 OpenFlags |= O_BINARY; |
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455 #endif |
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456 |
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457 if (Flags & F_Append) |
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458 OpenFlags |= O_APPEND; |
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459 else |
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460 OpenFlags |= O_TRUNC; |
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461 if (Flags & F_Excl) |
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462 OpenFlags |= O_EXCL; |
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463 |
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464 while ((FD = open(Filename, OpenFlags, 0664)) < 0) { |
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465 if (errno != EINTR) { |
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466 ErrorInfo = "Error opening output file '" + std::string(Filename) + "'"; |
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467 ShouldClose = false; |
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468 return; |
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469 } |
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470 } |
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471 |
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472 // Ok, we successfully opened the file, so it'll need to be closed. |
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473 ShouldClose = true; |
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474 } |
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475 |
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476 /// raw_fd_ostream ctor - FD is the file descriptor that this writes to. If |
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477 /// ShouldClose is true, this closes the file when the stream is destroyed. |
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478 raw_fd_ostream::raw_fd_ostream(int fd, bool shouldClose, bool unbuffered) |
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479 : raw_ostream(unbuffered), FD(fd), |
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480 ShouldClose(shouldClose), Error(false), UseAtomicWrites(false) { |
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481 #ifdef O_BINARY |
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482 // Setting STDOUT and STDERR to binary mode is necessary in Win32 |
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483 // to avoid undesirable linefeed conversion. |
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484 if (fd == STDOUT_FILENO || fd == STDERR_FILENO) |
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485 setmode(fd, O_BINARY); |
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486 #endif |
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487 |
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488 // Get the starting position. |
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489 off_t loc = ::lseek(FD, 0, SEEK_CUR); |
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490 if (loc == (off_t)-1) |
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491 pos = 0; |
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492 else |
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493 pos = static_cast<uint64_t>(loc); |
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494 } |
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495 |
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496 raw_fd_ostream::~raw_fd_ostream() { |
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497 if (FD >= 0) { |
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498 flush(); |
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499 if (ShouldClose) |
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500 while (::close(FD) != 0) |
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501 if (errno != EINTR) { |
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502 error_detected(); |
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503 break; |
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504 } |
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505 } |
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506 |
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507 #ifdef __MINGW32__ |
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508 // On mingw, global dtors should not call exit(). |
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509 // report_fatal_error() invokes exit(). We know report_fatal_error() |
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510 // might not write messages to stderr when any errors were detected |
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511 // on FD == 2. |
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512 if (FD == 2) return; |
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513 #endif |
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514 |
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515 // If there are any pending errors, report them now. Clients wishing |
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516 // to avoid report_fatal_error calls should check for errors with |
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517 // has_error() and clear the error flag with clear_error() before |
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518 // destructing raw_ostream objects which may have errors. |
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519 if (has_error()) |
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520 report_fatal_error("IO failure on output stream.", /*GenCrashDiag=*/false); |
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521 } |
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522 |
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523 |
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524 void raw_fd_ostream::write_impl(const char *Ptr, size_t Size) { |
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525 assert(FD >= 0 && "File already closed."); |
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526 pos += Size; |
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527 |
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528 do { |
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529 ssize_t ret; |
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530 |
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531 // Check whether we should attempt to use atomic writes. |
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532 if (LLVM_LIKELY(!UseAtomicWrites)) { |
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533 ret = ::write(FD, Ptr, Size); |
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534 } else { |
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535 // Use ::writev() where available. |
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536 #if defined(HAVE_WRITEV) |
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537 const void *Addr = static_cast<const void *>(Ptr); |
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538 struct iovec IOV = {const_cast<void *>(Addr), Size }; |
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539 ret = ::writev(FD, &IOV, 1); |
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540 #else |
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541 ret = ::write(FD, Ptr, Size); |
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542 #endif |
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543 } |
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544 |
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545 if (ret < 0) { |
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546 // If it's a recoverable error, swallow it and retry the write. |
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547 // |
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548 // Ideally we wouldn't ever see EAGAIN or EWOULDBLOCK here, since |
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549 // raw_ostream isn't designed to do non-blocking I/O. However, some |
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550 // programs, such as old versions of bjam, have mistakenly used |
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551 // O_NONBLOCK. For compatibility, emulate blocking semantics by |
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552 // spinning until the write succeeds. If you don't want spinning, |
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553 // don't use O_NONBLOCK file descriptors with raw_ostream. |
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554 if (errno == EINTR || errno == EAGAIN |
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555 #ifdef EWOULDBLOCK |
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556 || errno == EWOULDBLOCK |
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557 #endif |
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558 ) |
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559 continue; |
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560 |
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561 // Otherwise it's a non-recoverable error. Note it and quit. |
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562 error_detected(); |
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563 break; |
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564 } |
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565 |
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566 // The write may have written some or all of the data. Update the |
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567 // size and buffer pointer to reflect the remainder that needs |
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568 // to be written. If there are no bytes left, we're done. |
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569 Ptr += ret; |
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570 Size -= ret; |
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571 } while (Size > 0); |
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572 } |
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573 |
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574 void raw_fd_ostream::close() { |
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575 assert(ShouldClose); |
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576 ShouldClose = false; |
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577 flush(); |
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578 while (::close(FD) != 0) |
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579 if (errno != EINTR) { |
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580 error_detected(); |
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581 break; |
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582 } |
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583 FD = -1; |
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584 } |
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585 |
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586 uint64_t raw_fd_ostream::seek(uint64_t off) { |
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587 flush(); |
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588 pos = ::lseek(FD, off, SEEK_SET); |
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589 if (pos != off) |
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590 error_detected(); |
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591 return pos; |
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592 } |
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593 |
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594 size_t raw_fd_ostream::preferred_buffer_size() const { |
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595 #if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(__minix) |
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596 // Windows and Minix have no st_blksize. |
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597 assert(FD >= 0 && "File not yet open!"); |
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598 struct stat statbuf; |
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599 if (fstat(FD, &statbuf) != 0) |
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600 return 0; |
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601 |
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602 // If this is a terminal, don't use buffering. Line buffering |
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603 // would be a more traditional thing to do, but it's not worth |
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604 // the complexity. |
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605 if (S_ISCHR(statbuf.st_mode) && isatty(FD)) |
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606 return 0; |
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607 // Return the preferred block size. |
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608 return statbuf.st_blksize; |
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609 #else |
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610 return raw_ostream::preferred_buffer_size(); |
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611 #endif |
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612 } |
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613 |
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614 raw_ostream &raw_fd_ostream::changeColor(enum Colors colors, bool bold, |
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615 bool bg) { |
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616 if (sys::Process::ColorNeedsFlush()) |
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617 flush(); |
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618 const char *colorcode = |
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619 (colors == SAVEDCOLOR) ? sys::Process::OutputBold(bg) |
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620 : sys::Process::OutputColor(colors, bold, bg); |
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621 if (colorcode) { |
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622 size_t len = strlen(colorcode); |
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623 write(colorcode, len); |
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624 // don't account colors towards output characters |
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625 pos -= len; |
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626 } |
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627 return *this; |
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628 } |
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629 |
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630 raw_ostream &raw_fd_ostream::resetColor() { |
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631 if (sys::Process::ColorNeedsFlush()) |
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632 flush(); |
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633 const char *colorcode = sys::Process::ResetColor(); |
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634 if (colorcode) { |
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635 size_t len = strlen(colorcode); |
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636 write(colorcode, len); |
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637 // don't account colors towards output characters |
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638 pos -= len; |
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639 } |
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640 return *this; |
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641 } |
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642 |
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643 raw_ostream &raw_fd_ostream::reverseColor() { |
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644 if (sys::Process::ColorNeedsFlush()) |
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645 flush(); |
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646 const char *colorcode = sys::Process::OutputReverse(); |
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647 if (colorcode) { |
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648 size_t len = strlen(colorcode); |
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649 write(colorcode, len); |
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650 // don't account colors towards output characters |
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651 pos -= len; |
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652 } |
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653 return *this; |
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654 } |
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655 |
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656 bool raw_fd_ostream::is_displayed() const { |
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657 return sys::Process::FileDescriptorIsDisplayed(FD); |
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658 } |
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659 |
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660 bool raw_fd_ostream::has_colors() const { |
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661 return sys::Process::FileDescriptorHasColors(FD); |
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662 } |
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663 |
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664 //===----------------------------------------------------------------------===// |
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665 // outs(), errs(), nulls() |
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666 //===----------------------------------------------------------------------===// |
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667 |
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668 /// outs() - This returns a reference to a raw_ostream for standard output. |
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669 /// Use it like: outs() << "foo" << "bar"; |
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670 raw_ostream &llvm::outs() { |
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671 // Set buffer settings to model stdout behavior. |
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672 // Delete the file descriptor when the program exists, forcing error |
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673 // detection. If you don't want this behavior, don't use outs(). |
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674 static raw_fd_ostream S(STDOUT_FILENO, true); |
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675 return S; |
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676 } |
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677 |
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678 /// errs() - This returns a reference to a raw_ostream for standard error. |
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679 /// Use it like: errs() << "foo" << "bar"; |
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680 raw_ostream &llvm::errs() { |
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681 // Set standard error to be unbuffered by default. |
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682 static raw_fd_ostream S(STDERR_FILENO, false, true); |
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683 return S; |
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684 } |
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685 |
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686 /// nulls() - This returns a reference to a raw_ostream which discards output. |
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687 raw_ostream &llvm::nulls() { |
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688 static raw_null_ostream S; |
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689 return S; |
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690 } |
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691 |
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692 |
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693 //===----------------------------------------------------------------------===// |
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694 // raw_string_ostream |
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695 //===----------------------------------------------------------------------===// |
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696 |
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697 raw_string_ostream::~raw_string_ostream() { |
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698 flush(); |
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699 } |
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700 |
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701 void raw_string_ostream::write_impl(const char *Ptr, size_t Size) { |
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702 OS.append(Ptr, Size); |
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703 } |
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704 |
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705 //===----------------------------------------------------------------------===// |
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706 // raw_svector_ostream |
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707 //===----------------------------------------------------------------------===// |
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708 |
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709 // The raw_svector_ostream implementation uses the SmallVector itself as the |
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710 // buffer for the raw_ostream. We guarantee that the raw_ostream buffer is |
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711 // always pointing past the end of the vector, but within the vector |
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712 // capacity. This allows raw_ostream to write directly into the correct place, |
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713 // and we only need to set the vector size when the data is flushed. |
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714 |
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715 raw_svector_ostream::raw_svector_ostream(SmallVectorImpl<char> &O) : OS(O) { |
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716 // Set up the initial external buffer. We make sure that the buffer has at |
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717 // least 128 bytes free; raw_ostream itself only requires 64, but we want to |
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718 // make sure that we don't grow the buffer unnecessarily on destruction (when |
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719 // the data is flushed). See the FIXME below. |
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720 OS.reserve(OS.size() + 128); |
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721 SetBuffer(OS.end(), OS.capacity() - OS.size()); |
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722 } |
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723 |
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724 raw_svector_ostream::~raw_svector_ostream() { |
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725 // FIXME: Prevent resizing during this flush(). |
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726 flush(); |
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727 } |
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728 |
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729 /// resync - This is called when the SmallVector we're appending to is changed |
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730 /// outside of the raw_svector_ostream's control. It is only safe to do this |
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731 /// if the raw_svector_ostream has previously been flushed. |
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732 void raw_svector_ostream::resync() { |
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733 assert(GetNumBytesInBuffer() == 0 && "Didn't flush before mutating vector"); |
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734 |
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735 if (OS.capacity() - OS.size() < 64) |
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736 OS.reserve(OS.capacity() * 2); |
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737 SetBuffer(OS.end(), OS.capacity() - OS.size()); |
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738 } |
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739 |
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740 void raw_svector_ostream::write_impl(const char *Ptr, size_t Size) { |
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741 // If we're writing bytes from the end of the buffer into the smallvector, we |
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742 // don't need to copy the bytes, just commit the bytes because they are |
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743 // already in the right place. |
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744 if (Ptr == OS.end()) { |
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745 assert(OS.size() + Size <= OS.capacity() && "Invalid write_impl() call!"); |
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746 OS.set_size(OS.size() + Size); |
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747 } else { |
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748 assert(GetNumBytesInBuffer() == 0 && |
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749 "Should be writing from buffer if some bytes in it"); |
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750 // Otherwise, do copy the bytes. |
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751 OS.append(Ptr, Ptr+Size); |
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752 } |
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753 |
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754 // Grow the vector if necessary. |
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755 if (OS.capacity() - OS.size() < 64) |
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756 OS.reserve(OS.capacity() * 2); |
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757 |
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758 // Update the buffer position. |
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759 SetBuffer(OS.end(), OS.capacity() - OS.size()); |
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760 } |
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761 |
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762 uint64_t raw_svector_ostream::current_pos() const { |
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763 return OS.size(); |
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764 } |
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765 |
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766 StringRef raw_svector_ostream::str() { |
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767 flush(); |
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768 return StringRef(OS.begin(), OS.size()); |
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769 } |
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770 |
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771 //===----------------------------------------------------------------------===// |
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772 // raw_null_ostream |
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773 //===----------------------------------------------------------------------===// |
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774 |
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775 raw_null_ostream::~raw_null_ostream() { |
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776 #ifndef NDEBUG |
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777 // ~raw_ostream asserts that the buffer is empty. This isn't necessary |
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778 // with raw_null_ostream, but it's better to have raw_null_ostream follow |
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779 // the rules than to change the rules just for raw_null_ostream. |
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780 flush(); |
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781 #endif |
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782 } |
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783 |
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784 void raw_null_ostream::write_impl(const char *Ptr, size_t Size) { |
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785 } |
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786 |
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787 uint64_t raw_null_ostream::current_pos() const { |
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788 return 0; |
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789 } |