1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_UTILITIES_OSTREAM_HPP
26 #define SHARE_VM_UTILITIES_OSTREAM_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/timer.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 class GCId;
33 DEBUG_ONLY(class ResourceMark;)
34
35 // Output streams for printing
36 //
37 // Printing guidelines:
38 // Where possible, please use tty->print() and tty->print_cr().
39 // For product mode VM warnings use warning() which internally uses tty.
40 // In places where tty is not initialized yet or too much overhead,
41 // we may use jio_printf:
42 // jio_fprintf(defaultStream::output_stream(), "Message");
43 // This allows for redirection via -XX:+DisplayVMOutputToStdout and
44 // -XX:+DisplayVMOutputToStderr
45 class outputStream : public ResourceObj {
46 protected:
47 int _indentation; // current indentation
48 int _width; // width of the page
49 int _position; // position on the current line
50 int _newlines; // number of '\n' output so far
51 julong _precount; // number of chars output, less _position
52 TimeStamp _stamp; // for time stamps
53
54 void update_position(const char* s, size_t len);
55 static const char* do_vsnprintf(char* buffer, size_t buflen,
56 const char* format, va_list ap,
57 bool add_cr,
58 size_t& result_len) ATTRIBUTE_PRINTF(3, 0);
59
60 public:
61 // creation
62 outputStream(int width = 80);
63 outputStream(int width, bool has_time_stamps);
64
65 // indentation
66 outputStream& indent();
67 void inc() { _indentation++; };
68 void dec() { _indentation--; };
69 void inc(int n) { _indentation += n; };
70 void dec(int n) { _indentation -= n; };
71 int indentation() const { return _indentation; }
72 void set_indentation(int i) { _indentation = i; }
73 void fill_to(int col);
74 void move_to(int col, int slop = 6, int min_space = 2);
75
76 // sizing
77 int width() const { return _width; }
78 int position() const { return _position; }
79 int newlines() const { return _newlines; }
80 julong count() const { return _precount + _position; }
81 void set_count(julong count) { _precount = count - _position; }
82 void set_position(int pos) { _position = pos; }
83
84 // printing
85 void print(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
86 void print_cr(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
87 void vprint(const char *format, va_list argptr) ATTRIBUTE_PRINTF(2, 0);
88 void vprint_cr(const char* format, va_list argptr) ATTRIBUTE_PRINTF(2, 0);
89 void print_raw(const char* str) { write(str, strlen(str)); }
90 void print_raw(const char* str, int len) { write(str, len); }
91 void print_raw_cr(const char* str) { write(str, strlen(str)); cr(); }
92 void print_raw_cr(const char* str, int len){ write(str, len); cr(); }
93 void print_data(void* data, size_t len, bool with_ascii);
94 void put(char ch);
95 void sp(int count = 1);
96 void cr();
97 void bol() { if (_position > 0) cr(); }
98
99 // Time stamp
100 TimeStamp& time_stamp() { return _stamp; }
101 void stamp();
102 void stamp(bool guard, const char* prefix, const char* suffix);
103 void stamp(bool guard) {
104 stamp(guard, "", ": ");
105 }
106 // Date stamp
107 void date_stamp(bool guard, const char* prefix, const char* suffix);
108 // A simplified call that includes a suffix of ": "
109 void date_stamp(bool guard) {
110 date_stamp(guard, "", ": ");
111 }
112
113 // portable printing of 64 bit integers
114 void print_jlong(jlong value);
115 void print_julong(julong value);
116
117 // flushing
118 virtual void flush() {}
119 virtual void write(const char* str, size_t len) = 0;
120 virtual void rotate_log(bool force, outputStream* out = NULL) {} // GC log rotation
121 virtual ~outputStream() {} // close properly on deletion
122
123 void dec_cr() { dec(); cr(); }
124 void inc_cr() { inc(); cr(); }
125 };
126
127 // standard output
128 // ANSI C++ name collision
129 extern outputStream* tty; // tty output
130
131 class streamIndentor : public StackObj {
132 private:
133 outputStream* _str;
134 int _amount;
135
136 public:
137 streamIndentor(outputStream* str, int amt = 2) : _str(str), _amount(amt) {
138 _str->inc(_amount);
139 }
140 ~streamIndentor() { _str->dec(_amount); }
141 };
142
143
144 // advisory locking for the shared tty stream:
145 class ttyLocker: StackObj {
146 friend class ttyUnlocker;
147 private:
148 intx _holder;
149
150 public:
151 static intx hold_tty(); // returns a "holder" token
152 static void release_tty(intx holder); // must witness same token
153 static bool release_tty_if_locked(); // returns true if lock was released
154 static void break_tty_lock_for_safepoint(intx holder);
155
156 ttyLocker() { _holder = hold_tty(); }
157 ~ttyLocker() { release_tty(_holder); }
158 };
159
160 // Release the tty lock if it's held and reacquire it if it was
161 // locked. Used to avoid lock ordering problems.
162 class ttyUnlocker: StackObj {
163 private:
164 bool _was_locked;
165 public:
166 ttyUnlocker() {
167 _was_locked = ttyLocker::release_tty_if_locked();
168 }
169 ~ttyUnlocker() {
170 if (_was_locked) {
171 ttyLocker::hold_tty();
172 }
173 }
174 };
175
176 // for writing to strings; buffer will expand automatically
177 class stringStream : public outputStream {
178 protected:
179 char* buffer;
180 size_t buffer_pos;
181 size_t buffer_length;
182 bool buffer_fixed;
183 DEBUG_ONLY(ResourceMark* rm;)
184 public:
185 stringStream(size_t initial_bufsize = 256);
186 stringStream(char* fixed_buffer, size_t fixed_buffer_size);
187 ~stringStream();
188 virtual void write(const char* c, size_t len);
189 size_t size() { return buffer_pos; }
190 const char* base() { return buffer; }
191 void reset() { buffer_pos = 0; _precount = 0; _position = 0; }
192 char* as_string();
193 };
194
195 class fileStream : public outputStream {
196 protected:
197 FILE* _file;
198 bool _need_close;
199 public:
200 fileStream() { _file = NULL; _need_close = false; }
201 fileStream(const char* file_name);
202 fileStream(const char* file_name, const char* opentype);
203 fileStream(FILE* file, bool need_close = false) { _file = file; _need_close = need_close; }
204 ~fileStream();
205 bool is_open() const { return _file != NULL; }
206 void set_need_close(bool b) { _need_close = b;}
207 virtual void write(const char* c, size_t len);
208 size_t read(void *data, size_t size, size_t count) { return ::fread(data, size, count, _file); }
209 char* readln(char *data, int count);
210 int eof() { return feof(_file); }
211 long fileSize();
212 void rewind() { ::rewind(_file); }
213 void flush();
214 };
215
216 CDS_ONLY(extern fileStream* classlist_file;)
217
218 // unlike fileStream, fdStream does unbuffered I/O by calling
219 // open() and write() directly. It is async-safe, but output
220 // from multiple thread may be mixed together. Used by fatal
221 // error handler.
222 class fdStream : public outputStream {
223 protected:
224 int _fd;
225 bool _need_close;
226 public:
227 fdStream(const char* file_name);
228 fdStream(int fd = -1) { _fd = fd; _need_close = false; }
229 ~fdStream();
230 bool is_open() const { return _fd != -1; }
231 void set_fd(int fd) { _fd = fd; _need_close = false; }
232 int fd() const { return _fd; }
233 virtual void write(const char* c, size_t len);
234 void flush() {};
235 };
236
237 class logStream : public outputStream {
238 private:
239 stringStream _current_line;
240 void (*_log_func)(const char* fmt, ...) ATTRIBUTE_PRINTF(1, 2);
241 public:
242 void write(const char* s, size_t len);
243 logStream(void (*log_func)(const char* fmt, ...)) : _log_func(log_func) {}
244 ~logStream() {
245 guarantee(_current_line.size() == 0, "Buffer not flushed. Missing call to print_cr()?");
246 }
247 };
248
249 void ostream_init();
250 void ostream_init_log();
251 void ostream_exit();
252 void ostream_abort();
253
254 // staticBufferStream uses a user-supplied buffer for all formatting.
255 // Used for safe formatting during fatal error handling. Not MT safe.
256 // Do not share the stream between multiple threads.
257 class staticBufferStream : public outputStream {
258 private:
259 char* _buffer;
260 size_t _buflen;
261 outputStream* _outer_stream;
262 public:
263 staticBufferStream(char* buffer, size_t buflen,
264 outputStream *outer_stream);
265 ~staticBufferStream() {};
266 virtual void write(const char* c, size_t len);
267 void flush();
268 void print(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
269 void print_cr(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
270 void vprint(const char *format, va_list argptr) ATTRIBUTE_PRINTF(2, 0);
271 void vprint_cr(const char* format, va_list argptr) ATTRIBUTE_PRINTF(2, 0);
272 };
273
274 // In the non-fixed buffer case an underlying buffer will be created and
275 // managed in C heap. Not MT-safe.
276 class bufferedStream : public outputStream {
277 protected:
278 char* buffer;
279 size_t buffer_pos;
280 size_t buffer_max;
281 size_t buffer_length;
282 bool buffer_fixed;
283 public:
284 bufferedStream(size_t initial_bufsize = 256, size_t bufmax = 1024*1024*10);
285 bufferedStream(char* fixed_buffer, size_t fixed_buffer_size, size_t bufmax = 1024*1024*10);
286 ~bufferedStream();
287 virtual void write(const char* c, size_t len);
288 size_t size() { return buffer_pos; }
289 const char* base() { return buffer; }
290 void reset() { buffer_pos = 0; _precount = 0; _position = 0; }
291 char* as_string();
292 };
293
294 #define O_BUFLEN 2000 // max size of output of individual print() methods
295
296 #ifndef PRODUCT
297
298 class networkStream : public bufferedStream {
299
300 private:
301 int _socket;
302
303 public:
304 networkStream();
305 ~networkStream();
306
307 bool connect(const char *host, short port);
308 bool is_open() const { return _socket != -1; }
309 int read(char *buf, size_t len);
310 void close();
311 virtual void flush();
312 };
313
314 #endif
315
316 #endif // SHARE_VM_UTILITIES_OSTREAM_HPP