LLVM  9.0.0svn
raw_ostream.h
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1 //===--- raw_ostream.h - Raw output stream ----------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file defines the raw_ostream class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_SUPPORT_RAW_OSTREAM_H
14 #define LLVM_SUPPORT_RAW_OSTREAM_H
15 
16 #include "llvm/ADT/SmallVector.h"
17 #include "llvm/ADT/StringRef.h"
18 #include <cassert>
19 #include <cstddef>
20 #include <cstdint>
21 #include <cstring>
22 #include <string>
23 #include <system_error>
24 
25 namespace llvm {
26 
27 class formatv_object_base;
28 class format_object_base;
29 class FormattedString;
30 class FormattedNumber;
31 class FormattedBytes;
32 
33 namespace sys {
34 namespace fs {
35 enum FileAccess : unsigned;
36 enum OpenFlags : unsigned;
38 } // end namespace fs
39 } // end namespace sys
40 
41 /// This class implements an extremely fast bulk output stream that can *only*
42 /// output to a stream. It does not support seeking, reopening, rewinding, line
43 /// buffered disciplines etc. It is a simple buffer that outputs
44 /// a chunk at a time.
45 class raw_ostream {
46 private:
47  /// The buffer is handled in such a way that the buffer is
48  /// uninitialized, unbuffered, or out of space when OutBufCur >=
49  /// OutBufEnd. Thus a single comparison suffices to determine if we
50  /// need to take the slow path to write a single character.
51  ///
52  /// The buffer is in one of three states:
53  /// 1. Unbuffered (BufferMode == Unbuffered)
54  /// 1. Uninitialized (BufferMode != Unbuffered && OutBufStart == 0).
55  /// 2. Buffered (BufferMode != Unbuffered && OutBufStart != 0 &&
56  /// OutBufEnd - OutBufStart >= 1).
57  ///
58  /// If buffered, then the raw_ostream owns the buffer if (BufferMode ==
59  /// InternalBuffer); otherwise the buffer has been set via SetBuffer and is
60  /// managed by the subclass.
61  ///
62  /// If a subclass installs an external buffer using SetBuffer then it can wait
63  /// for a \see write_impl() call to handle the data which has been put into
64  /// this buffer.
65  char *OutBufStart, *OutBufEnd, *OutBufCur;
66 
67  enum BufferKind {
68  Unbuffered = 0,
69  InternalBuffer,
70  ExternalBuffer
71  } BufferMode;
72 
73 public:
74  // color order matches ANSI escape sequence, don't change
75  enum Colors {
76  BLACK = 0,
77  RED,
84  SAVEDCOLOR
85  };
86 
87  explicit raw_ostream(bool unbuffered = false)
88  : BufferMode(unbuffered ? Unbuffered : InternalBuffer) {
89  // Start out ready to flush.
90  OutBufStart = OutBufEnd = OutBufCur = nullptr;
91  }
92 
93  raw_ostream(const raw_ostream &) = delete;
94  void operator=(const raw_ostream &) = delete;
95 
96  virtual ~raw_ostream();
97 
98  /// tell - Return the current offset with the file.
99  uint64_t tell() const { return current_pos() + GetNumBytesInBuffer(); }
100 
101  //===--------------------------------------------------------------------===//
102  // Configuration Interface
103  //===--------------------------------------------------------------------===//
104 
105  /// Set the stream to be buffered, with an automatically determined buffer
106  /// size.
107  void SetBuffered();
108 
109  /// Set the stream to be buffered, using the specified buffer size.
110  void SetBufferSize(size_t Size) {
111  flush();
112  SetBufferAndMode(new char[Size], Size, InternalBuffer);
113  }
114 
115  size_t GetBufferSize() const {
116  // If we're supposed to be buffered but haven't actually gotten around
117  // to allocating the buffer yet, return the value that would be used.
118  if (BufferMode != Unbuffered && OutBufStart == nullptr)
119  return preferred_buffer_size();
120 
121  // Otherwise just return the size of the allocated buffer.
122  return OutBufEnd - OutBufStart;
123  }
124 
125  /// Set the stream to be unbuffered. When unbuffered, the stream will flush
126  /// after every write. This routine will also flush the buffer immediately
127  /// when the stream is being set to unbuffered.
128  void SetUnbuffered() {
129  flush();
130  SetBufferAndMode(nullptr, 0, Unbuffered);
131  }
132 
133  size_t GetNumBytesInBuffer() const {
134  return OutBufCur - OutBufStart;
135  }
136 
137  //===--------------------------------------------------------------------===//
138  // Data Output Interface
139  //===--------------------------------------------------------------------===//
140 
141  void flush() {
142  if (OutBufCur != OutBufStart)
143  flush_nonempty();
144  }
145 
147  if (OutBufCur >= OutBufEnd)
148  return write(C);
149  *OutBufCur++ = C;
150  return *this;
151  }
152 
153  raw_ostream &operator<<(unsigned char C) {
154  if (OutBufCur >= OutBufEnd)
155  return write(C);
156  *OutBufCur++ = C;
157  return *this;
158  }
159 
160  raw_ostream &operator<<(signed char C) {
161  if (OutBufCur >= OutBufEnd)
162  return write(C);
163  *OutBufCur++ = C;
164  return *this;
165  }
166 
168  // Inline fast path, particularly for strings with a known length.
169  size_t Size = Str.size();
170 
171  // Make sure we can use the fast path.
172  if (Size > (size_t)(OutBufEnd - OutBufCur))
173  return write(Str.data(), Size);
174 
175  if (Size) {
176  memcpy(OutBufCur, Str.data(), Size);
177  OutBufCur += Size;
178  }
179  return *this;
180  }
181 
182  raw_ostream &operator<<(const char *Str) {
183  // Inline fast path, particularly for constant strings where a sufficiently
184  // smart compiler will simplify strlen.
185 
186  return this->operator<<(StringRef(Str));
187  }
188 
189  raw_ostream &operator<<(const std::string &Str) {
190  // Avoid the fast path, it would only increase code size for a marginal win.
191  return write(Str.data(), Str.length());
192  }
193 
194  raw_ostream &operator<<(const SmallVectorImpl<char> &Str) {
195  return write(Str.data(), Str.size());
196  }
197 
198  raw_ostream &operator<<(unsigned long N);
199  raw_ostream &operator<<(long N);
200  raw_ostream &operator<<(unsigned long long N);
201  raw_ostream &operator<<(long long N);
202  raw_ostream &operator<<(const void *P);
203 
204  raw_ostream &operator<<(unsigned int N) {
205  return this->operator<<(static_cast<unsigned long>(N));
206  }
207 
209  return this->operator<<(static_cast<long>(N));
210  }
211 
212  raw_ostream &operator<<(double N);
213 
214  /// Output \p N in hexadecimal, without any prefix or padding.
215  raw_ostream &write_hex(unsigned long long N);
216 
217  /// Output a formatted UUID with dash separators.
218  using uuid_t = uint8_t[16];
219  raw_ostream &write_uuid(const uuid_t UUID);
220 
221  /// Output \p Str, turning '\\', '\t', '\n', '"', and anything that doesn't
222  /// satisfy llvm::isPrint into an escape sequence.
223  raw_ostream &write_escaped(StringRef Str, bool UseHexEscapes = false);
224 
225  raw_ostream &write(unsigned char C);
226  raw_ostream &write(const char *Ptr, size_t Size);
227 
228  // Formatted output, see the format() function in Support/Format.h.
230 
231  // Formatted output, see the leftJustify() function in Support/Format.h.
233 
234  // Formatted output, see the formatHex() function in Support/Format.h.
236 
237  // Formatted output, see the formatv() function in Support/FormatVariadic.h.
239 
240  // Formatted output, see the format_bytes() function in Support/Format.h.
242 
243  /// indent - Insert 'NumSpaces' spaces.
244  raw_ostream &indent(unsigned NumSpaces);
245 
246  /// write_zeros - Insert 'NumZeros' nulls.
247  raw_ostream &write_zeros(unsigned NumZeros);
248 
249  /// Changes the foreground color of text that will be output from this point
250  /// forward.
251  /// @param Color ANSI color to use, the special SAVEDCOLOR can be used to
252  /// change only the bold attribute, and keep colors untouched
253  /// @param Bold bold/brighter text, default false
254  /// @param BG if true change the background, default: change foreground
255  /// @returns itself so it can be used within << invocations
257  bool Bold = false,
258  bool BG = false) {
259  (void)Color;
260  (void)Bold;
261  (void)BG;
262  return *this;
263  }
264 
265  /// Resets the colors to terminal defaults. Call this when you are done
266  /// outputting colored text, or before program exit.
267  virtual raw_ostream &resetColor() { return *this; }
268 
269  /// Reverses the foreground and background colors.
270  virtual raw_ostream &reverseColor() { return *this; }
271 
272  /// This function determines if this stream is connected to a "tty" or
273  /// "console" window. That is, the output would be displayed to the user
274  /// rather than being put on a pipe or stored in a file.
275  virtual bool is_displayed() const { return false; }
276 
277  /// This function determines if this stream is displayed and supports colors.
278  virtual bool has_colors() const { return is_displayed(); }
279 
280  //===--------------------------------------------------------------------===//
281  // Subclass Interface
282  //===--------------------------------------------------------------------===//
283 
284 private:
285  /// The is the piece of the class that is implemented by subclasses. This
286  /// writes the \p Size bytes starting at
287  /// \p Ptr to the underlying stream.
288  ///
289  /// This function is guaranteed to only be called at a point at which it is
290  /// safe for the subclass to install a new buffer via SetBuffer.
291  ///
292  /// \param Ptr The start of the data to be written. For buffered streams this
293  /// is guaranteed to be the start of the buffer.
294  ///
295  /// \param Size The number of bytes to be written.
296  ///
297  /// \invariant { Size > 0 }
298  virtual void write_impl(const char *Ptr, size_t Size) = 0;
299 
300  /// Return the current position within the stream, not counting the bytes
301  /// currently in the buffer.
302  virtual uint64_t current_pos() const = 0;
303 
304 protected:
305  /// Use the provided buffer as the raw_ostream buffer. This is intended for
306  /// use only by subclasses which can arrange for the output to go directly
307  /// into the desired output buffer, instead of being copied on each flush.
308  void SetBuffer(char *BufferStart, size_t Size) {
309  SetBufferAndMode(BufferStart, Size, ExternalBuffer);
310  }
311 
312  /// Return an efficient buffer size for the underlying output mechanism.
313  virtual size_t preferred_buffer_size() const;
314 
315  /// Return the beginning of the current stream buffer, or 0 if the stream is
316  /// unbuffered.
317  const char *getBufferStart() const { return OutBufStart; }
318 
319  //===--------------------------------------------------------------------===//
320  // Private Interface
321  //===--------------------------------------------------------------------===//
322 private:
323  /// Install the given buffer and mode.
324  void SetBufferAndMode(char *BufferStart, size_t Size, BufferKind Mode);
325 
326  /// Flush the current buffer, which is known to be non-empty. This outputs the
327  /// currently buffered data and resets the buffer to empty.
328  void flush_nonempty();
329 
330  /// Copy data into the buffer. Size must not be greater than the number of
331  /// unused bytes in the buffer.
332  void copy_to_buffer(const char *Ptr, size_t Size);
333 
334  virtual void anchor();
335 };
336 
337 /// An abstract base class for streams implementations that also support a
338 /// pwrite operation. This is useful for code that can mostly stream out data,
339 /// but needs to patch in a header that needs to know the output size.
341  virtual void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) = 0;
342  void anchor() override;
343 
344 public:
345  explicit raw_pwrite_stream(bool Unbuffered = false)
346  : raw_ostream(Unbuffered) {}
347  void pwrite(const char *Ptr, size_t Size, uint64_t Offset) {
348 #ifndef NDEBUG
349  uint64_t Pos = tell();
350  // /dev/null always reports a pos of 0, so we cannot perform this check
351  // in that case.
352  if (Pos)
353  assert(Size + Offset <= Pos && "We don't support extending the stream");
354 #endif
355  pwrite_impl(Ptr, Size, Offset);
356  }
357 };
358 
359 //===----------------------------------------------------------------------===//
360 // File Output Streams
361 //===----------------------------------------------------------------------===//
362 
363 /// A raw_ostream that writes to a file descriptor.
364 ///
366  int FD;
367  bool ShouldClose;
368 
369  bool SupportsSeeking;
370 
371 #ifdef _WIN32
372  /// True if this fd refers to a Windows console device. Mintty and other
373  /// terminal emulators are TTYs, but they are not consoles.
374  bool IsWindowsConsole = false;
375 #endif
376 
377  std::error_code EC;
378 
379  uint64_t pos;
380 
381  /// See raw_ostream::write_impl.
382  void write_impl(const char *Ptr, size_t Size) override;
383 
384  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
385 
386  /// Return the current position within the stream, not counting the bytes
387  /// currently in the buffer.
388  uint64_t current_pos() const override { return pos; }
389 
390  /// Determine an efficient buffer size.
391  size_t preferred_buffer_size() const override;
392 
393  /// Set the flag indicating that an output error has been encountered.
394  void error_detected(std::error_code EC) { this->EC = EC; }
395 
396  void anchor() override;
397 
398 public:
399  /// Open the specified file for writing. If an error occurs, information
400  /// about the error is put into EC, and the stream should be immediately
401  /// destroyed;
402  /// \p Flags allows optional flags to control how the file will be opened.
403  ///
404  /// As a special case, if Filename is "-", then the stream will use
405  /// STDOUT_FILENO instead of opening a file. This will not close the stdout
406  /// descriptor.
407  raw_fd_ostream(StringRef Filename, std::error_code &EC);
408  raw_fd_ostream(StringRef Filename, std::error_code &EC,
410  raw_fd_ostream(StringRef Filename, std::error_code &EC,
411  sys::fs::FileAccess Access);
412  raw_fd_ostream(StringRef Filename, std::error_code &EC,
413  sys::fs::OpenFlags Flags);
414  raw_fd_ostream(StringRef Filename, std::error_code &EC,
416  sys::fs::OpenFlags Flags);
417 
418  /// FD is the file descriptor that this writes to. If ShouldClose is true,
419  /// this closes the file when the stream is destroyed. If FD is for stdout or
420  /// stderr, it will not be closed.
421  raw_fd_ostream(int fd, bool shouldClose, bool unbuffered=false);
422 
423  ~raw_fd_ostream() override;
424 
425  /// Manually flush the stream and close the file. Note that this does not call
426  /// fsync.
427  void close();
428 
429  bool supportsSeeking() { return SupportsSeeking; }
430 
431  /// Flushes the stream and repositions the underlying file descriptor position
432  /// to the offset specified from the beginning of the file.
433  uint64_t seek(uint64_t off);
434 
435  raw_ostream &changeColor(enum Colors colors, bool bold=false,
436  bool bg=false) override;
437  raw_ostream &resetColor() override;
438 
439  raw_ostream &reverseColor() override;
440 
441  bool is_displayed() const override;
442 
443  bool has_colors() const override;
444 
445  std::error_code error() const { return EC; }
446 
447  /// Return the value of the flag in this raw_fd_ostream indicating whether an
448  /// output error has been encountered.
449  /// This doesn't implicitly flush any pending output. Also, it doesn't
450  /// guarantee to detect all errors unless the stream has been closed.
451  bool has_error() const { return bool(EC); }
452 
453  /// Set the flag read by has_error() to false. If the error flag is set at the
454  /// time when this raw_ostream's destructor is called, report_fatal_error is
455  /// called to report the error. Use clear_error() after handling the error to
456  /// avoid this behavior.
457  ///
458  /// "Errors should never pass silently.
459  /// Unless explicitly silenced."
460  /// - from The Zen of Python, by Tim Peters
461  ///
462  void clear_error() { EC = std::error_code(); }
463 };
464 
465 /// This returns a reference to a raw_ostream for standard output. Use it like:
466 /// outs() << "foo" << "bar";
467 raw_ostream &outs();
468 
469 /// This returns a reference to a raw_ostream for standard error. Use it like:
470 /// errs() << "foo" << "bar";
471 raw_ostream &errs();
472 
473 /// This returns a reference to a raw_ostream which simply discards output.
474 raw_ostream &nulls();
475 
476 //===----------------------------------------------------------------------===//
477 // Output Stream Adaptors
478 //===----------------------------------------------------------------------===//
479 
480 /// A raw_ostream that writes to an std::string. This is a simple adaptor
481 /// class. This class does not encounter output errors.
483  std::string &OS;
484 
485  /// See raw_ostream::write_impl.
486  void write_impl(const char *Ptr, size_t Size) override;
487 
488  /// Return the current position within the stream, not counting the bytes
489  /// currently in the buffer.
490  uint64_t current_pos() const override { return OS.size(); }
491 
492 public:
493  explicit raw_string_ostream(std::string &O) : OS(O) {}
494  ~raw_string_ostream() override;
495 
496  /// Flushes the stream contents to the target string and returns the string's
497  /// reference.
498  std::string& str() {
499  flush();
500  return OS;
501  }
502 };
503 
504 /// A raw_ostream that writes to an SmallVector or SmallString. This is a
505 /// simple adaptor class. This class does not encounter output errors.
506 /// raw_svector_ostream operates without a buffer, delegating all memory
507 /// management to the SmallString. Thus the SmallString is always up-to-date,
508 /// may be used directly and there is no need to call flush().
511 
512  /// See raw_ostream::write_impl.
513  void write_impl(const char *Ptr, size_t Size) override;
514 
515  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
516 
517  /// Return the current position within the stream.
518  uint64_t current_pos() const override;
519 
520 public:
521  /// Construct a new raw_svector_ostream.
522  ///
523  /// \param O The vector to write to; this should generally have at least 128
524  /// bytes free to avoid any extraneous memory overhead.
526  SetUnbuffered();
527  }
528 
529  ~raw_svector_ostream() override = default;
530 
531  void flush() = delete;
532 
533  /// Return a StringRef for the vector contents.
534  StringRef str() { return StringRef(OS.data(), OS.size()); }
535 };
536 
537 /// A raw_ostream that discards all output.
539  /// See raw_ostream::write_impl.
540  void write_impl(const char *Ptr, size_t size) override;
541  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
542 
543  /// Return the current position within the stream, not counting the bytes
544  /// currently in the buffer.
545  uint64_t current_pos() const override;
546 
547 public:
548  explicit raw_null_ostream() = default;
549  ~raw_null_ostream() override;
550 };
551 
553  raw_ostream &OS;
554  SmallVector<char, 0> Buffer;
555 
556  virtual void anchor() override;
557 
558 public:
560  ~buffer_ostream() override { OS << str(); }
561 };
562 
563 } // end namespace llvm
564 
565 #endif // LLVM_SUPPORT_RAW_OSTREAM_H
uint64_t CallInst * C
raw_ostream & errs()
This returns a reference to a raw_ostream for standard error.
uint8_t[16] uuid_t
Output a formatted UUID with dash separators.
Definition: raw_ostream.h:218
SI Whole Quad Mode
raw_string_ostream(std::string &O)
Definition: raw_ostream.h:493
This class represents lattice values for constants.
Definition: AllocatorList.h:23
buffer_ostream(raw_ostream &OS)
Definition: raw_ostream.h:559
A raw_ostream that discards all output.
Definition: raw_ostream.h:538
size_t GetBufferSize() const
Definition: raw_ostream.h:115
virtual raw_ostream & changeColor(enum Colors Color, bool Bold=false, bool BG=false)
Changes the foreground color of text that will be output from this point forward. ...
Definition: raw_ostream.h:256
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:509
raw_ostream & operator<<(const std::string &Str)
Definition: raw_ostream.h:189
std::error_code error() const
Definition: raw_ostream.h:445
raw_ostream & operator<<(const char *Str)
Definition: raw_ostream.h:182
This is a helper class for left_justify, right_justify, and center_justify.
Definition: Format.h:128
raw_ostream & operator<<(int N)
Definition: raw_ostream.h:208
void SetBuffer(char *BufferStart, size_t Size)
Use the provided buffer as the raw_ostream buffer.
Definition: raw_ostream.h:308
LLVM_NODISCARD size_t size() const
size - Get the string size.
Definition: StringRef.h:130
This is a helper class used for handling formatted output.
Definition: Format.h:37
raw_ostream & operator<<(char C)
Definition: raw_ostream.h:146
raw_ostream & outs()
This returns a reference to a raw_ostream for standard output.
#define P(N)
void SetUnbuffered()
Set the stream to be unbuffered.
Definition: raw_ostream.h:128
raw_ostream & operator<<(unsigned char C)
Definition: raw_ostream.h:153
void pwrite(const char *Ptr, size_t Size, uint64_t Offset)
Definition: raw_ostream.h:347
virtual raw_ostream & reverseColor()
Reverses the foreground and background colors.
Definition: raw_ostream.h:270
const char * getBufferStart() const
Return the beginning of the current stream buffer, or 0 if the stream is unbuffered.
Definition: raw_ostream.h:317
std::pair< llvm::MachO::Architecture, std::string > UUID
raw_ostream(bool unbuffered=false)
Definition: raw_ostream.h:87
static void write(bool isBE, void *P, T V)
virtual bool has_colors() const
This function determines if this stream is displayed and supports colors.
Definition: raw_ostream.h:278
void SetBufferSize(size_t Size)
Set the stream to be buffered, using the specified buffer size.
Definition: raw_ostream.h:110
size_t size() const
Definition: SmallVector.h:52
std::string & str()
Flushes the stream contents to the target string and returns the string&#39;s reference.
Definition: raw_ostream.h:498
bool has_error() const
Return the value of the flag in this raw_fd_ostream indicating whether an output error has been encou...
Definition: raw_ostream.h:451
This is a helper class used for format_hex() and format_decimal().
Definition: Format.h:163
Color
A "color", which is either even or odd.
auto size(R &&Range, typename std::enable_if< std::is_same< typename std::iterator_traits< decltype(Range.begin())>::iterator_category, std::random_access_iterator_tag >::value, void >::type *=nullptr) -> decltype(std::distance(Range.begin(), Range.end()))
Get the size of a range.
Definition: STLExtras.h:1173
virtual bool is_displayed() const
This function determines if this stream is connected to a "tty" or "console" window.
Definition: raw_ostream.h:275
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:534
raw_ostream & operator<<(unsigned int N)
Definition: raw_ostream.h:204
size_t GetNumBytesInBuffer() const
Definition: raw_ostream.h:133
raw_ostream & operator<<(raw_ostream &OS, const Memory::ProtectionFlags &PF)
Debugging output for Memory::ProtectionFlags.
Definition: Memory.cpp:35
raw_pwrite_stream(bool Unbuffered=false)
Definition: raw_ostream.h:345
void write_hex(raw_ostream &S, uint64_t N, HexPrintStyle Style, Optional< size_t > Width=None)
A raw_ostream that writes to a file descriptor.
Definition: raw_ostream.h:365
pointer data()
Return a pointer to the vector&#39;s buffer, even if empty().
Definition: SmallVector.h:144
#define N
uint32_t Size
Definition: Profile.cpp:46
raw_ostream & operator<<(StringRef Str)
Definition: raw_ostream.h:167
~buffer_ostream() override
Definition: raw_ostream.h:560
An abstract base class for streams implementations that also support a pwrite operation.
Definition: raw_ostream.h:340
LLVM_NODISCARD const char * data() const
data - Get a pointer to the start of the string (which may not be null terminated).
Definition: StringRef.h:122
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:482
virtual raw_ostream & resetColor()
Resets the colors to terminal defaults.
Definition: raw_ostream.h:267
raw_ostream & nulls()
This returns a reference to a raw_ostream which simply discards output.
uint64_t tell() const
tell - Return the current offset with the file.
Definition: raw_ostream.h:99
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:45
raw_svector_ostream(SmallVectorImpl< char > &O)
Construct a new raw_svector_ostream.
Definition: raw_ostream.h:525
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
raw_ostream & operator<<(signed char C)
Definition: raw_ostream.h:160
void clear_error()
Set the flag read by has_error() to false.
Definition: raw_ostream.h:462