1 //===--- raw_ostream.h - Raw output stream ----------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the raw_ostream class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_SUPPORT_RAW_OSTREAM_H
15 #define LLVM_SUPPORT_RAW_OSTREAM_H
17 #include "llvm/ADT/StringExtras.h"
24 class format_object_base;
26 class SmallVectorImpl;
28 /// raw_ostream - This class implements an extremely fast bulk output stream
29 /// that can *only* output to a stream. It does not support seeking, reopening,
30 /// rewinding, line buffered disciplines etc. It is a simple buffer that outputs
31 /// a chunk at a time.
34 char *OutBufStart, *OutBufEnd, *OutBufCur;
38 raw_ostream(bool unbuffered=false) : Unbuffered(unbuffered) {
39 // Start out ready to flush.
40 OutBufStart = OutBufEnd = OutBufCur = 0;
43 virtual ~raw_ostream() {
44 delete [] OutBufStart;
47 //===--------------------------------------------------------------------===//
48 // Configuration Interface
49 //===--------------------------------------------------------------------===//
51 /// SetBufferSize - Set the internal buffer size to the specified amount
52 /// instead of the default.
53 void SetBufferSize(unsigned Size) {
55 "Buffer size must be somewhat large for invariants to hold");
58 delete [] OutBufStart;
59 OutBufStart = new char[Size];
60 OutBufEnd = OutBufStart+Size;
61 OutBufCur = OutBufStart;
64 /// SetUnbuffered - Set the streams buffering status. When
65 /// unbuffered the stream will flush after every write. This routine
66 /// will also flush the buffer immediately when the stream is being
67 /// set to unbuffered.
68 void SetUnbuffered(bool unbuffered) {
69 Unbuffered = unbuffered;
74 //===--------------------------------------------------------------------===//
75 // Data Output Interface
76 //===--------------------------------------------------------------------===//
79 if (OutBufCur != OutBufStart)
83 raw_ostream &operator<<(char C) {
84 if (OutBufCur >= OutBufEnd)
90 raw_ostream &operator<<(unsigned char C) {
91 if (OutBufCur >= OutBufEnd)
97 raw_ostream &operator<<(signed char C) {
98 if (OutBufCur >= OutBufEnd)
104 raw_ostream &operator<<(const char *Str) {
105 return write(Str, strlen(Str));
108 raw_ostream &operator<<(const std::string& Str) {
109 return write(Str.data(), Str.length());
112 raw_ostream &operator<<(unsigned long N);
113 raw_ostream &operator<<(long N);
114 raw_ostream &operator<<(unsigned long long N);
115 raw_ostream &operator<<(long long N);
116 raw_ostream &operator<<(const void *P);
117 raw_ostream &operator<<(unsigned int N) {
118 return this->operator<<(static_cast<unsigned long>(N));
121 raw_ostream &operator<<(int N) {
122 return this->operator<<(static_cast<long>(N));
125 raw_ostream &operator<<(double N) {
126 return this->operator<<(ftostr(N));
129 raw_ostream &write(const char *Ptr, unsigned Size);
131 // Formatted output, see the format() function in Support/Format.h.
132 raw_ostream &operator<<(const format_object_base &Fmt);
134 //===--------------------------------------------------------------------===//
135 // Subclass Interface
136 //===--------------------------------------------------------------------===//
140 /// flush_impl - The is the piece of the class that is implemented by
141 /// subclasses. This outputs the currently buffered data and resets the
143 virtual void flush_impl() = 0;
145 /// HandleFlush - A stream's implementation of flush should call this after
146 /// emitting the bytes to the data sink.
148 if (OutBufStart == 0)
150 OutBufCur = OutBufStart;
153 // An out of line virtual method to provide a home for the class vtable.
154 virtual void handle();
157 //===----------------------------------------------------------------------===//
158 // File Output Streams
159 //===----------------------------------------------------------------------===//
161 /// raw_fd_ostream - A raw_ostream that writes to a file descriptor.
163 class raw_fd_ostream : public raw_ostream {
168 /// raw_fd_ostream - Open the specified file for writing. If an
169 /// error occurs, information about the error is put into ErrorInfo,
170 /// and the stream should be immediately destroyed; the string will
171 /// be empty if no error occurred.
173 /// \param Filename - The file to open. If this is "-" then the
174 /// stream will use stdout instead.
175 /// \param Binary - The file should be opened in binary mode on
176 /// platforms that support this distinction.
177 raw_fd_ostream(const char *Filename, bool Binary, std::string &ErrorInfo);
179 /// raw_fd_ostream ctor - FD is the file descriptor that this writes to. If
180 /// ShouldClose is true, this closes the file when the stream is destroyed.
181 raw_fd_ostream(int fd, bool shouldClose,
182 bool unbuffered=false) : raw_ostream(unbuffered), FD(fd),
183 ShouldClose(shouldClose) {}
187 /// flush_impl - The is the piece of the class that is implemented by
188 /// subclasses. This outputs the currently buffered data and resets the
190 virtual void flush_impl();
192 /// close - Manually flush the stream and close the file.
195 /// tell - Return the current offset with the file.
197 return pos + (OutBufCur - OutBufStart);
200 /// seek - Flushes the stream and repositions the underlying file descriptor
201 /// positition to the offset specified from the beginning of the file.
202 uint64_t seek(uint64_t off);
205 /// raw_stdout_ostream - This is a stream that always prints to stdout.
207 class raw_stdout_ostream : public raw_fd_ostream {
208 // An out of line virtual method to provide a home for the class vtable.
209 virtual void handle();
211 raw_stdout_ostream();
214 /// raw_stderr_ostream - This is a stream that always prints to stderr.
216 class raw_stderr_ostream : public raw_fd_ostream {
217 // An out of line virtual method to provide a home for the class vtable.
218 virtual void handle();
220 raw_stderr_ostream();
223 /// outs() - This returns a reference to a raw_ostream for standard output.
224 /// Use it like: outs() << "foo" << "bar";
227 /// errs() - This returns a reference to a raw_ostream for standard error.
228 /// Use it like: errs() << "foo" << "bar";
232 //===----------------------------------------------------------------------===//
233 // Output Stream Adaptors
234 //===----------------------------------------------------------------------===//
236 /// raw_os_ostream - A raw_ostream that writes to an std::ostream. This is a
237 /// simple adaptor class.
238 class raw_os_ostream : public raw_ostream {
241 raw_os_ostream(std::ostream &O) : OS(O) {}
244 /// flush_impl - The is the piece of the class that is implemented by
245 /// subclasses. This outputs the currently buffered data and resets the
247 virtual void flush_impl();
250 /// raw_string_ostream - A raw_ostream that writes to an std::string. This is a
251 /// simple adaptor class.
252 class raw_string_ostream : public raw_ostream {
255 raw_string_ostream(std::string &O) : OS(O) {}
256 ~raw_string_ostream();
258 /// str - Flushes the stream contents to the target string and returns
259 /// the string's reference.
265 /// flush_impl - The is the piece of the class that is implemented by
266 /// subclasses. This outputs the currently buffered data and resets the
268 virtual void flush_impl();
271 /// raw_svector_ostream - A raw_ostream that writes to an SmallVector or
272 /// SmallString. This is a simple adaptor class.
273 class raw_svector_ostream : public raw_ostream {
274 SmallVectorImpl<char> &OS;
276 raw_svector_ostream(SmallVectorImpl<char> &O) : OS(O) {}
277 ~raw_svector_ostream();
279 /// flush_impl - The is the piece of the class that is implemented by
280 /// subclasses. This outputs the currently buffered data and resets the
282 virtual void flush_impl();
285 } // end llvm namespace