1 /*
   2  * Copyright (c) 1997, 2013, 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 #include "precompiled.hpp"
  26 #include "compiler/compileLog.hpp"
  27 #include "oops/oop.inline.hpp"
  28 #include "runtime/arguments.hpp"
  29 #include "utilities/defaultStream.hpp"
  30 #include "utilities/ostream.hpp"
  31 #include "utilities/top.hpp"
  32 #include "utilities/xmlstream.hpp"
  33 #ifdef TARGET_OS_FAMILY_linux
  34 # include "os_linux.inline.hpp"
  35 #endif
  36 #ifdef TARGET_OS_FAMILY_solaris
  37 # include "os_solaris.inline.hpp"
  38 #endif
  39 #ifdef TARGET_OS_FAMILY_windows
  40 # include "os_windows.inline.hpp"
  41 #endif
  42 #ifdef TARGET_OS_FAMILY_bsd
  43 # include "os_bsd.inline.hpp"
  44 #endif
  45 
  46 extern "C" void jio_print(const char* s); // Declarationtion of jvm method
  47 
  48 outputStream::outputStream(int width) {
  49   _width       = width;
  50   _position    = 0;
  51   _newlines    = 0;
  52   _precount    = 0;
  53   _indentation = 0;
  54 }
  55 
  56 outputStream::outputStream(int width, bool has_time_stamps) {
  57   _width       = width;
  58   _position    = 0;
  59   _newlines    = 0;
  60   _precount    = 0;
  61   _indentation = 0;
  62   if (has_time_stamps)  _stamp.update();
  63 }
  64 
  65 void outputStream::update_position(const char* s, size_t len) {
  66   for (size_t i = 0; i < len; i++) {
  67     char ch = s[i];
  68     if (ch == '\n') {
  69       _newlines += 1;
  70       _precount += _position + 1;
  71       _position = 0;
  72     } else if (ch == '\t') {
  73       int tw = 8 - (_position & 7);
  74       _position += tw;
  75       _precount -= tw-1;  // invariant:  _precount + _position == total count
  76     } else {
  77       _position += 1;
  78     }
  79   }
  80 }
  81 
  82 // Execute a vsprintf, using the given buffer if necessary.
  83 // Return a pointer to the formatted string.
  84 const char* outputStream::do_vsnprintf(char* buffer, size_t buflen,
  85                                        const char* format, va_list ap,
  86                                        bool add_cr,
  87                                        size_t& result_len) {
  88   const char* result;
  89   if (add_cr)  buflen--;
  90   if (!strchr(format, '%')) {
  91     // constant format string
  92     result = format;
  93     result_len = strlen(result);
  94     if (add_cr && result_len >= buflen)  result_len = buflen-1;  // truncate
  95   } else if (format[0] == '%' && format[1] == 's' && format[2] == '\0') {
  96     // trivial copy-through format string
  97     result = va_arg(ap, const char*);
  98     result_len = strlen(result);
  99     if (add_cr && result_len >= buflen)  result_len = buflen-1;  // truncate
 100   } else if (vsnprintf(buffer, buflen, format, ap) >= 0) {
 101     result = buffer;
 102     result_len = strlen(result);
 103   } else {
 104     DEBUG_ONLY(warning("increase O_BUFLEN in ostream.hpp -- output truncated");)
 105     result = buffer;
 106     result_len = buflen - 1;
 107     buffer[result_len] = 0;
 108   }
 109   if (add_cr) {
 110     if (result != buffer) {
 111       strncpy(buffer, result, buflen);
 112       result = buffer;
 113     }
 114     buffer[result_len++] = '\n';
 115     buffer[result_len] = 0;
 116   }
 117   return result;
 118 }
 119 
 120 void outputStream::print(const char* format, ...) {
 121   char buffer[O_BUFLEN];
 122   va_list ap;
 123   va_start(ap, format);
 124   size_t len;
 125   const char* str = do_vsnprintf(buffer, O_BUFLEN, format, ap, false, len);
 126   write(str, len);
 127   va_end(ap);
 128 }
 129 
 130 void outputStream::print_cr(const char* format, ...) {
 131   char buffer[O_BUFLEN];
 132   va_list ap;
 133   va_start(ap, format);
 134   size_t len;
 135   const char* str = do_vsnprintf(buffer, O_BUFLEN, format, ap, true, len);
 136   write(str, len);
 137   va_end(ap);
 138 }
 139 
 140 void outputStream::vprint(const char *format, va_list argptr) {
 141   char buffer[O_BUFLEN];
 142   size_t len;
 143   const char* str = do_vsnprintf(buffer, O_BUFLEN, format, argptr, false, len);
 144   write(str, len);
 145 }
 146 
 147 void outputStream::vprint_cr(const char* format, va_list argptr) {
 148   char buffer[O_BUFLEN];
 149   size_t len;
 150   const char* str = do_vsnprintf(buffer, O_BUFLEN, format, argptr, true, len);
 151   write(str, len);
 152 }
 153 
 154 void outputStream::fill_to(int col) {
 155   int need_fill = col - position();
 156   sp(need_fill);
 157 }
 158 
 159 void outputStream::move_to(int col, int slop, int min_space) {
 160   if (position() >= col + slop)
 161     cr();
 162   int need_fill = col - position();
 163   if (need_fill < min_space)
 164     need_fill = min_space;
 165   sp(need_fill);
 166 }
 167 
 168 void outputStream::put(char ch) {
 169   assert(ch != 0, "please fix call site");
 170   char buf[] = { ch, '\0' };
 171   write(buf, 1);
 172 }
 173 
 174 #define SP_USE_TABS false
 175 
 176 void outputStream::sp(int count) {
 177   if (count < 0)  return;
 178   if (SP_USE_TABS && count >= 8) {
 179     int target = position() + count;
 180     while (count >= 8) {
 181       this->write("\t", 1);
 182       count -= 8;
 183     }
 184     count = target - position();
 185   }
 186   while (count > 0) {
 187     int nw = (count > 8) ? 8 : count;
 188     this->write("        ", nw);
 189     count -= nw;
 190   }
 191 }
 192 
 193 void outputStream::cr() {
 194   this->write("\n", 1);
 195 }
 196 
 197 void outputStream::stamp() {
 198   if (! _stamp.is_updated()) {
 199     _stamp.update(); // start at 0 on first call to stamp()
 200   }
 201 
 202   // outputStream::stamp() may get called by ostream_abort(), use snprintf
 203   // to avoid allocating large stack buffer in print().
 204   char buf[40];
 205   jio_snprintf(buf, sizeof(buf), "%.3f", _stamp.seconds());
 206   print_raw(buf);
 207 }
 208 
 209 void outputStream::stamp(bool guard,
 210                          const char* prefix,
 211                          const char* suffix) {
 212   if (!guard) {
 213     return;
 214   }
 215   print_raw(prefix);
 216   stamp();
 217   print_raw(suffix);
 218 }
 219 
 220 void outputStream::date_stamp(bool guard,
 221                               const char* prefix,
 222                               const char* suffix) {
 223   if (!guard) {
 224     return;
 225   }
 226   print_raw(prefix);
 227   static const char error_time[] = "yyyy-mm-ddThh:mm:ss.mmm+zzzz";
 228   static const int buffer_length = 32;
 229   char buffer[buffer_length];
 230   const char* iso8601_result = os::iso8601_time(buffer, buffer_length);
 231   if (iso8601_result != NULL) {
 232     print_raw(buffer);
 233   } else {
 234     print_raw(error_time);
 235   }
 236   print_raw(suffix);
 237   return;
 238 }
 239 
 240 outputStream& outputStream::indent() {
 241   while (_position < _indentation) sp();
 242   return *this;
 243 }
 244 
 245 void outputStream::print_jlong(jlong value) {
 246   print(JLONG_FORMAT, value);
 247 }
 248 
 249 void outputStream::print_julong(julong value) {
 250   print(JULONG_FORMAT, value);
 251 }
 252 
 253 /**
 254  * This prints out hex data in a 'windbg' or 'xxd' form, where each line is:
 255  *   <hex-address>: 8 * <hex-halfword> <ascii translation (optional)>
 256  * example:
 257  * 0000000: 7f44 4f46 0102 0102 0000 0000 0000 0000  .DOF............
 258  * 0000010: 0000 0000 0000 0040 0000 0020 0000 0005  .......@... ....
 259  * 0000020: 0000 0000 0000 0040 0000 0000 0000 015d  .......@.......]
 260  * ...
 261  *
 262  * indent is applied to each line.  Ends with a CR.
 263  */
 264 void outputStream::print_data(void* data, size_t len, bool with_ascii) {
 265   size_t limit = (len + 16) / 16 * 16;
 266   for (size_t i = 0; i < limit; ++i) {
 267     if (i % 16 == 0) {
 268       indent().print("%07x:", i);
 269     }
 270     if (i % 2 == 0) {
 271       print(" ");
 272     }
 273     if (i < len) {
 274       print("%02x", ((unsigned char*)data)[i]);
 275     } else {
 276       print("  ");
 277     }
 278     if ((i + 1) % 16 == 0) {
 279       if (with_ascii) {
 280         print("  ");
 281         for (size_t j = 0; j < 16; ++j) {
 282           size_t idx = i + j - 15;
 283           if (idx < len) {
 284             char c = ((char*)data)[idx];
 285             print("%c", c >= 32 && c <= 126 ? c : '.');
 286           }
 287         }
 288       }
 289       print_cr("");
 290     }
 291   }
 292 }
 293 
 294 stringStream::stringStream(size_t initial_size) : outputStream() {
 295   buffer_length = initial_size;
 296   buffer        = NEW_RESOURCE_ARRAY(char, buffer_length);
 297   buffer_pos    = 0;
 298   buffer_fixed  = false;
 299   DEBUG_ONLY(rm = Thread::current()->current_resource_mark();)
 300 }
 301 
 302 // useful for output to fixed chunks of memory, such as performance counters
 303 stringStream::stringStream(char* fixed_buffer, size_t fixed_buffer_size) : outputStream() {
 304   buffer_length = fixed_buffer_size;
 305   buffer        = fixed_buffer;
 306   buffer_pos    = 0;
 307   buffer_fixed  = true;
 308 }
 309 
 310 void stringStream::write(const char* s, size_t len) {
 311   size_t write_len = len;               // number of non-null bytes to write
 312   size_t end = buffer_pos + len + 1;    // position after write and final '\0'
 313   if (end > buffer_length) {
 314     if (buffer_fixed) {
 315       // if buffer cannot resize, silently truncate
 316       end = buffer_length;
 317       write_len = end - buffer_pos - 1; // leave room for the final '\0'
 318     } else {
 319       // For small overruns, double the buffer.  For larger ones,
 320       // increase to the requested size.
 321       if (end < buffer_length * 2) {
 322         end = buffer_length * 2;
 323       }
 324       char* oldbuf = buffer;
 325       assert(rm == NULL || Thread::current()->current_resource_mark() == rm,
 326              "stringStream is re-allocated with a different ResourceMark");
 327       buffer = NEW_RESOURCE_ARRAY(char, end);
 328       strncpy(buffer, oldbuf, buffer_pos);
 329       buffer_length = end;
 330     }
 331   }
 332   // invariant: buffer is always null-terminated
 333   guarantee(buffer_pos + write_len + 1 <= buffer_length, "stringStream oob");
 334   buffer[buffer_pos + write_len] = 0;
 335   strncpy(buffer + buffer_pos, s, write_len);
 336   buffer_pos += write_len;
 337 
 338   // Note that the following does not depend on write_len.
 339   // This means that position and count get updated
 340   // even when overflow occurs.
 341   update_position(s, len);
 342 }
 343 
 344 char* stringStream::as_string() {
 345   char* copy = NEW_RESOURCE_ARRAY(char, buffer_pos+1);
 346   strncpy(copy, buffer, buffer_pos);
 347   copy[buffer_pos] = 0;  // terminating null
 348   return copy;
 349 }
 350 
 351 stringStream::~stringStream() {}
 352 
 353 xmlStream*   xtty;
 354 outputStream* tty;
 355 outputStream* gclog_or_tty;
 356 extern Mutex* tty_lock;
 357 
 358 fileStream::fileStream(const char* file_name) {
 359   _file = fopen(file_name, "w");
 360   _need_close = true;
 361 }
 362 
 363 fileStream::fileStream(const char* file_name, const char* opentype) {
 364   _file = fopen(file_name, opentype);
 365   _need_close = true;
 366 }
 367 
 368 void fileStream::write(const char* s, size_t len) {
 369   if (_file != NULL)  {
 370     // Make an unused local variable to avoid warning from gcc 4.x compiler.
 371     size_t count = fwrite(s, 1, len, _file);
 372   }
 373   update_position(s, len);
 374 }
 375 
 376 long fileStream::fileSize() {
 377   long size = -1;
 378   if (_file != NULL) {
 379     long pos  = ::ftell(_file);
 380     if (::fseek(_file, 0, SEEK_END) == 0) {
 381       size = ::ftell(_file);
 382     }
 383     ::fseek(_file, pos, SEEK_SET);
 384   }
 385   return size;
 386 }
 387 
 388 char* fileStream::readln(char *data, int count ) {
 389   char * ret = ::fgets(data, count, _file);
 390   //Get rid of annoying \n char
 391   data[::strlen(data)-1] = '\0';
 392   return ret;
 393 }
 394 
 395 fileStream::~fileStream() {
 396   if (_file != NULL) {
 397     if (_need_close) fclose(_file);
 398     _file      = NULL;
 399   }
 400 }
 401 
 402 void fileStream::flush() {
 403   fflush(_file);
 404 }
 405 
 406 fdStream::fdStream(const char* file_name) {
 407   _fd = open(file_name, O_WRONLY | O_CREAT | O_TRUNC, 0666);
 408   _need_close = true;
 409 }
 410 
 411 fdStream::~fdStream() {
 412   if (_fd != -1) {
 413     if (_need_close) close(_fd);
 414     _fd = -1;
 415   }
 416 }
 417 
 418 void fdStream::write(const char* s, size_t len) {
 419   if (_fd != -1) {
 420     // Make an unused local variable to avoid warning from gcc 4.x compiler.
 421     size_t count = ::write(_fd, s, (int)len);
 422   }
 423   update_position(s, len);
 424 }
 425 
 426 rotatingFileStream::~rotatingFileStream() {
 427   if (_file != NULL) {
 428     if (_need_close) fclose(_file);
 429     _file      = NULL;
 430     FREE_C_HEAP_ARRAY(char, _file_name, mtInternal);
 431     _file_name = NULL;
 432   }
 433 }
 434 
 435 rotatingFileStream::rotatingFileStream(const char* file_name) {
 436   _cur_file_num = 0;
 437   _bytes_written = 0L;
 438   _file_name = NEW_C_HEAP_ARRAY(char, strlen(file_name)+10, mtInternal);
 439   jio_snprintf(_file_name, strlen(file_name)+10, "%s.%d", file_name, _cur_file_num);
 440   _file = fopen(_file_name, "w");
 441   _need_close = true;
 442 }
 443 
 444 rotatingFileStream::rotatingFileStream(const char* file_name, const char* opentype) {
 445   _cur_file_num = 0;
 446   _bytes_written = 0L;
 447   _file_name = NEW_C_HEAP_ARRAY(char, strlen(file_name)+10, mtInternal);
 448   jio_snprintf(_file_name, strlen(file_name)+10, "%s.%d", file_name, _cur_file_num);
 449   _file = fopen(_file_name, opentype);
 450   _need_close = true;
 451 }
 452 
 453 void rotatingFileStream::write(const char* s, size_t len) {
 454   if (_file != NULL) {
 455     size_t count = fwrite(s, 1, len, _file);
 456     _bytes_written += count;
 457   }
 458   update_position(s, len);
 459 }
 460 
 461 // rotate_log must be called from VMThread at safepoint. In case need change parameters
 462 // for gc log rotation from thread other than VMThread, a sub type of VM_Operation
 463 // should be created and be submitted to VMThread's operation queue. DO NOT call this
 464 // function directly. Currently, it is safe to rotate log at safepoint through VMThread.
 465 // That is, no mutator threads and concurrent GC threads run parallel with VMThread to
 466 // write to gc log file at safepoint. If in future, changes made for mutator threads or
 467 // concurrent GC threads to run parallel with VMThread at safepoint, write and rotate_log
 468 // must be synchronized.
 469 void rotatingFileStream::rotate_log() {
 470   if (_bytes_written < (jlong)GCLogFileSize) {
 471     return;
 472   }
 473 
 474 #ifdef ASSERT
 475   Thread *thread = Thread::current();
 476   assert(thread == NULL ||
 477          (thread->is_VM_thread() && SafepointSynchronize::is_at_safepoint()),
 478          "Must be VMThread at safepoint");
 479 #endif
 480   if (NumberOfGCLogFiles == 1) {
 481     // rotate in same file
 482     rewind();
 483     _bytes_written = 0L;
 484     return;
 485   }
 486 
 487   // rotate file in names file.0, file.1, file.2, ..., file.<MaxGCLogFileNumbers-1>
 488   // close current file, rotate to next file
 489   if (_file != NULL) {
 490     _cur_file_num ++;
 491     if (_cur_file_num >= NumberOfGCLogFiles) _cur_file_num = 0;
 492     jio_snprintf(_file_name, strlen(Arguments::gc_log_filename()) + 10, "%s.%d",
 493              Arguments::gc_log_filename(), _cur_file_num);
 494     fclose(_file);
 495     _file = NULL;
 496   }
 497   _file = fopen(_file_name, "w");
 498   if (_file != NULL) {
 499     _bytes_written = 0L;
 500     _need_close = true;
 501   } else {
 502     tty->print_cr("failed to open rotation log file %s due to %s\n",
 503                   _file_name, strerror(errno));
 504     _need_close = false;
 505   }
 506 }
 507 
 508 defaultStream* defaultStream::instance = NULL;
 509 int defaultStream::_output_fd = 1;
 510 int defaultStream::_error_fd  = 2;
 511 FILE* defaultStream::_output_stream = stdout;
 512 FILE* defaultStream::_error_stream  = stderr;
 513 
 514 #define LOG_MAJOR_VERSION 160
 515 #define LOG_MINOR_VERSION 1
 516 
 517 void defaultStream::init() {
 518   _inited = true;
 519   if (LogVMOutput || LogCompilation) {
 520     init_log();
 521   }
 522 }
 523 
 524 bool defaultStream::has_log_file() {
 525   // lazily create log file (at startup, LogVMOutput is false even
 526   // if +LogVMOutput is used, because the flags haven't been parsed yet)
 527   // For safer printing during fatal error handling, do not init logfile
 528   // if a VM error has been reported.
 529   if (!_inited && !is_error_reported())  init();
 530   return _log_file != NULL;
 531 }
 532 
 533 static const char* make_log_name(const char* log_name, const char* force_directory) {
 534   const char* basename = log_name;
 535   char file_sep = os::file_separator()[0];
 536   const char* cp;
 537   for (cp = log_name; *cp != '\0'; cp++) {
 538     if (*cp == '/' || *cp == file_sep) {
 539       basename = cp+1;
 540     }
 541   }
 542   const char* nametail = log_name;
 543 
 544   // Compute buffer length
 545   size_t buffer_length;
 546   if (force_directory != NULL) {
 547     buffer_length = strlen(force_directory) + strlen(os::file_separator()) +
 548                     strlen(basename) + 1;
 549   } else {
 550     buffer_length = strlen(log_name) + 1;
 551   }
 552 
 553   const char* star = strchr(basename, '*');
 554   int star_pos = (star == NULL) ? -1 : (star - nametail);
 555   int skip = 1;
 556   if (star == NULL) {
 557     // Try %p
 558     star = strstr(basename, "%p");
 559     if (star != NULL) {
 560       skip = 2;
 561     }
 562   }
 563   star_pos = (star == NULL) ? -1 : (star - nametail);
 564 
 565   char pid[32];
 566   if (star_pos >= 0) {
 567     jio_snprintf(pid, sizeof(pid), "%u", os::current_process_id());
 568     buffer_length += strlen(pid);
 569   }
 570 
 571   // Create big enough buffer.
 572   char *buf = NEW_C_HEAP_ARRAY(char, buffer_length, mtInternal);
 573 
 574   strcpy(buf, "");
 575   if (force_directory != NULL) {
 576     strcat(buf, force_directory);
 577     strcat(buf, os::file_separator());
 578     nametail = basename;       // completely skip directory prefix
 579   }
 580 
 581   if (star_pos >= 0) {
 582     // convert foo*bar.log or foo%pbar.log to foo123bar.log
 583     int buf_pos = (int) strlen(buf);
 584     strncpy(&buf[buf_pos], nametail, star_pos);
 585     strcpy(&buf[buf_pos + star_pos], pid);
 586     nametail += star_pos + skip;  // skip prefix and pid format
 587   }
 588 
 589   strcat(buf, nametail);      // append rest of name, or all of name
 590   return buf;
 591 }
 592 
 593 void defaultStream::init_log() {
 594   // %%% Need a MutexLocker?
 595   const char* log_name = LogFile != NULL ? LogFile : "hotspot_pid%p.log";
 596   const char* try_name = make_log_name(log_name, NULL);
 597   fileStream* file = new(ResourceObj::C_HEAP, mtInternal) fileStream(try_name);
 598   if (!file->is_open()) {
 599     // Try again to open the file.
 600     char warnbuf[O_BUFLEN*2];
 601     jio_snprintf(warnbuf, sizeof(warnbuf),
 602                  "Warning:  Cannot open log file: %s\n", try_name);
 603     // Note:  This feature is for maintainer use only.  No need for L10N.
 604     jio_print(warnbuf);
 605     FREE_C_HEAP_ARRAY(char, try_name, mtInternal);
 606     try_name = make_log_name(log_name, os::get_temp_directory());
 607     jio_snprintf(warnbuf, sizeof(warnbuf),
 608                  "Warning:  Forcing option -XX:LogFile=%s\n", try_name);
 609     jio_print(warnbuf);
 610     delete file;
 611     file = new(ResourceObj::C_HEAP, mtInternal) fileStream(try_name);
 612     FREE_C_HEAP_ARRAY(char, try_name, mtInternal);
 613   } else {
 614     FREE_C_HEAP_ARRAY(char, try_name, mtInternal);
 615   }
 616 
 617   if (file->is_open()) {
 618     _log_file = file;
 619     xmlStream* xs = new(ResourceObj::C_HEAP, mtInternal) xmlStream(file);
 620     _outer_xmlStream = xs;
 621     if (this == tty)  xtty = xs;
 622     // Write XML header.
 623     xs->print_cr("<?xml version='1.0' encoding='UTF-8'?>");
 624     // (For now, don't bother to issue a DTD for this private format.)
 625     jlong time_ms = os::javaTimeMillis() - tty->time_stamp().milliseconds();
 626     // %%% Should be: jlong time_ms = os::start_time_milliseconds(), if
 627     // we ever get round to introduce that method on the os class
 628     xs->head("hotspot_log version='%d %d'"
 629              " process='%d' time_ms='"INT64_FORMAT"'",
 630              LOG_MAJOR_VERSION, LOG_MINOR_VERSION,
 631              os::current_process_id(), time_ms);
 632     // Write VM version header immediately.
 633     xs->head("vm_version");
 634     xs->head("name"); xs->text("%s", VM_Version::vm_name()); xs->cr();
 635     xs->tail("name");
 636     xs->head("release"); xs->text("%s", VM_Version::vm_release()); xs->cr();
 637     xs->tail("release");
 638     xs->head("info"); xs->text("%s", VM_Version::internal_vm_info_string()); xs->cr();
 639     xs->tail("info");
 640     xs->tail("vm_version");
 641     // Record information about the command-line invocation.
 642     xs->head("vm_arguments");  // Cf. Arguments::print_on()
 643     if (Arguments::num_jvm_flags() > 0) {
 644       xs->head("flags");
 645       Arguments::print_jvm_flags_on(xs->text());
 646       xs->tail("flags");
 647     }
 648     if (Arguments::num_jvm_args() > 0) {
 649       xs->head("args");
 650       Arguments::print_jvm_args_on(xs->text());
 651       xs->tail("args");
 652     }
 653     if (Arguments::java_command() != NULL) {
 654       xs->head("command"); xs->text()->print_cr("%s", Arguments::java_command());
 655       xs->tail("command");
 656     }
 657     if (Arguments::sun_java_launcher() != NULL) {
 658       xs->head("launcher"); xs->text()->print_cr("%s", Arguments::sun_java_launcher());
 659       xs->tail("launcher");
 660     }
 661     if (Arguments::system_properties() !=  NULL) {
 662       xs->head("properties");
 663       // Print it as a java-style property list.
 664       // System properties don't generally contain newlines, so don't bother with unparsing.
 665       for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
 666         xs->text()->print_cr("%s=%s", p->key(), p->value());
 667       }
 668       xs->tail("properties");
 669     }
 670     xs->tail("vm_arguments");
 671     // tty output per se is grouped under the <tty>...</tty> element.
 672     xs->head("tty");
 673     // All further non-markup text gets copied to the tty:
 674     xs->_text = this;  // requires friend declaration!
 675   } else {
 676     delete(file);
 677     // and leave xtty as NULL
 678     LogVMOutput = false;
 679     DisplayVMOutput = true;
 680     LogCompilation = false;
 681   }
 682 }
 683 
 684 // finish_log() is called during normal VM shutdown. finish_log_on_error() is
 685 // called by ostream_abort() after a fatal error.
 686 //
 687 void defaultStream::finish_log() {
 688   xmlStream* xs = _outer_xmlStream;
 689   xs->done("tty");
 690 
 691   // Other log forks are appended here, at the End of Time:
 692   CompileLog::finish_log(xs->out());  // write compile logging, if any, now
 693 
 694   xs->done("hotspot_log");
 695   xs->flush();
 696 
 697   fileStream* file = _log_file;
 698   _log_file = NULL;
 699 
 700   delete _outer_xmlStream;
 701   _outer_xmlStream = NULL;
 702 
 703   file->flush();
 704   delete file;
 705 }
 706 
 707 void defaultStream::finish_log_on_error(char *buf, int buflen) {
 708   xmlStream* xs = _outer_xmlStream;
 709 
 710   if (xs && xs->out()) {
 711 
 712     xs->done_raw("tty");
 713 
 714     // Other log forks are appended here, at the End of Time:
 715     CompileLog::finish_log_on_error(xs->out(), buf, buflen);  // write compile logging, if any, now
 716 
 717     xs->done_raw("hotspot_log");
 718     xs->flush();
 719 
 720     fileStream* file = _log_file;
 721     _log_file = NULL;
 722     _outer_xmlStream = NULL;
 723 
 724     if (file) {
 725       file->flush();
 726 
 727       // Can't delete or close the file because delete and fclose aren't
 728       // async-safe. We are about to die, so leave it to the kernel.
 729       // delete file;
 730     }
 731   }
 732 }
 733 
 734 intx defaultStream::hold(intx writer_id) {
 735   bool has_log = has_log_file();  // check before locking
 736   if (// impossible, but who knows?
 737       writer_id == NO_WRITER ||
 738 
 739       // bootstrap problem
 740       tty_lock == NULL ||
 741 
 742       // can't grab a lock or call Thread::current() if TLS isn't initialized
 743       ThreadLocalStorage::thread() == NULL ||
 744 
 745       // developer hook
 746       !SerializeVMOutput ||
 747 
 748       // VM already unhealthy
 749       is_error_reported() ||
 750 
 751       // safepoint == global lock (for VM only)
 752       (SafepointSynchronize::is_synchronizing() &&
 753        Thread::current()->is_VM_thread())
 754       ) {
 755     // do not attempt to lock unless we know the thread and the VM is healthy
 756     return NO_WRITER;
 757   }
 758   if (_writer == writer_id) {
 759     // already held, no need to re-grab the lock
 760     return NO_WRITER;
 761   }
 762   tty_lock->lock_without_safepoint_check();
 763   // got the lock
 764   if (writer_id != _last_writer) {
 765     if (has_log) {
 766       _log_file->bol();
 767       // output a hint where this output is coming from:
 768       _log_file->print_cr("<writer thread='" UINTX_FORMAT "'/>", writer_id);
 769     }
 770     _last_writer = writer_id;
 771   }
 772   _writer = writer_id;
 773   return writer_id;
 774 }
 775 
 776 void defaultStream::release(intx holder) {
 777   if (holder == NO_WRITER) {
 778     // nothing to release:  either a recursive lock, or we scribbled (too bad)
 779     return;
 780   }
 781   if (_writer != holder) {
 782     return;  // already unlocked, perhaps via break_tty_lock_for_safepoint
 783   }
 784   _writer = NO_WRITER;
 785   tty_lock->unlock();
 786 }
 787 
 788 
 789 // Yuck:  jio_print does not accept char*/len.
 790 static void call_jio_print(const char* s, size_t len) {
 791   char buffer[O_BUFLEN+100];
 792   if (len > sizeof(buffer)-1) {
 793     warning("increase O_BUFLEN in ostream.cpp -- output truncated");
 794     len = sizeof(buffer)-1;
 795   }
 796   strncpy(buffer, s, len);
 797   buffer[len] = '\0';
 798   jio_print(buffer);
 799 }
 800 
 801 
 802 void defaultStream::write(const char* s, size_t len) {
 803   intx thread_id = os::current_thread_id();
 804   intx holder = hold(thread_id);
 805 
 806   if (DisplayVMOutput &&
 807       (_outer_xmlStream == NULL || !_outer_xmlStream->inside_attrs())) {
 808     // print to output stream. It can be redirected by a vfprintf hook
 809     if (s[len] == '\0') {
 810       jio_print(s);
 811     } else {
 812       call_jio_print(s, len);
 813     }
 814   }
 815 
 816   // print to log file
 817   if (has_log_file()) {
 818     int nl0 = _newlines;
 819     xmlTextStream::write(s, len);
 820     // flush the log file too, if there were any newlines
 821     if (nl0 != _newlines){
 822       flush();
 823     }
 824   } else {
 825     update_position(s, len);
 826   }
 827 
 828   release(holder);
 829 }
 830 
 831 intx ttyLocker::hold_tty() {
 832   if (defaultStream::instance == NULL)  return defaultStream::NO_WRITER;
 833   intx thread_id = os::current_thread_id();
 834   return defaultStream::instance->hold(thread_id);
 835 }
 836 
 837 void ttyLocker::release_tty(intx holder) {
 838   if (holder == defaultStream::NO_WRITER)  return;
 839   defaultStream::instance->release(holder);
 840 }
 841 
 842 bool ttyLocker::release_tty_if_locked() {
 843   intx thread_id = os::current_thread_id();
 844   if (defaultStream::instance->writer() == thread_id) {
 845     // release the lock and return true so callers know if was
 846     // previously held.
 847     release_tty(thread_id);
 848     return true;
 849   }
 850   return false;
 851 }
 852 
 853 void ttyLocker::break_tty_lock_for_safepoint(intx holder) {
 854   if (defaultStream::instance != NULL &&
 855       defaultStream::instance->writer() == holder) {
 856     if (xtty != NULL) {
 857       xtty->print_cr("<!-- safepoint while printing -->");
 858     }
 859     defaultStream::instance->release(holder);
 860   }
 861   // (else there was no lock to break)
 862 }
 863 
 864 void ostream_init() {
 865   if (defaultStream::instance == NULL) {
 866     defaultStream::instance = new(ResourceObj::C_HEAP, mtInternal) defaultStream();
 867     tty = defaultStream::instance;
 868 
 869     // We want to ensure that time stamps in GC logs consider time 0
 870     // the time when the JVM is initialized, not the first time we ask
 871     // for a time stamp. So, here, we explicitly update the time stamp
 872     // of tty.
 873     tty->time_stamp().update_to(1);
 874   }
 875 }
 876 
 877 void ostream_init_log() {
 878   // For -Xloggc:<file> option - called in runtime/thread.cpp
 879   // Note : this must be called AFTER ostream_init()
 880 
 881   gclog_or_tty = tty; // default to tty
 882   if (Arguments::gc_log_filename() != NULL) {
 883     fileStream * gclog  = UseGCLogFileRotation ?
 884                           new(ResourceObj::C_HEAP, mtInternal)
 885                              rotatingFileStream(Arguments::gc_log_filename()) :
 886                           new(ResourceObj::C_HEAP, mtInternal)
 887                              fileStream(Arguments::gc_log_filename());
 888     if (gclog->is_open()) {
 889       // now we update the time stamp of the GC log to be synced up
 890       // with tty.
 891       gclog->time_stamp().update_to(tty->time_stamp().ticks());
 892     }
 893     gclog_or_tty = gclog;
 894   }
 895 
 896   // If we haven't lazily initialized the logfile yet, do it now,
 897   // to avoid the possibility of lazy initialization during a VM
 898   // crash, which can affect the stability of the fatal error handler.
 899   defaultStream::instance->has_log_file();
 900 }
 901 
 902 // ostream_exit() is called during normal VM exit to finish log files, flush
 903 // output and free resource.
 904 void ostream_exit() {
 905   static bool ostream_exit_called = false;
 906   if (ostream_exit_called)  return;
 907   ostream_exit_called = true;
 908   if (gclog_or_tty != tty) {
 909       delete gclog_or_tty;
 910   }
 911   {
 912       // we temporaly disable PrintMallocFree here
 913       // as otherwise it'll lead to using of almost deleted
 914       // tty or defaultStream::instance in logging facility
 915       // of HeapFree(), see 6391258
 916       DEBUG_ONLY(FlagSetting fs(PrintMallocFree, false);)
 917       if (tty != defaultStream::instance) {
 918           delete tty;
 919       }
 920       if (defaultStream::instance != NULL) {
 921           delete defaultStream::instance;
 922       }
 923   }
 924   tty = NULL;
 925   xtty = NULL;
 926   gclog_or_tty = NULL;
 927   defaultStream::instance = NULL;
 928 }
 929 
 930 // ostream_abort() is called by os::abort() when VM is about to die.
 931 void ostream_abort() {
 932   // Here we can't delete gclog_or_tty and tty, just flush their output
 933   if (gclog_or_tty) gclog_or_tty->flush();
 934   if (tty) tty->flush();
 935 
 936   if (defaultStream::instance != NULL) {
 937     static char buf[4096];
 938     defaultStream::instance->finish_log_on_error(buf, sizeof(buf));
 939   }
 940 }
 941 
 942 staticBufferStream::staticBufferStream(char* buffer, size_t buflen,
 943                                        outputStream *outer_stream) {
 944   _buffer = buffer;
 945   _buflen = buflen;
 946   _outer_stream = outer_stream;
 947   // compile task prints time stamp relative to VM start
 948   _stamp.update_to(1);
 949 }
 950 
 951 void staticBufferStream::write(const char* c, size_t len) {
 952   _outer_stream->print_raw(c, (int)len);
 953 }
 954 
 955 void staticBufferStream::flush() {
 956   _outer_stream->flush();
 957 }
 958 
 959 void staticBufferStream::print(const char* format, ...) {
 960   va_list ap;
 961   va_start(ap, format);
 962   size_t len;
 963   const char* str = do_vsnprintf(_buffer, _buflen, format, ap, false, len);
 964   write(str, len);
 965   va_end(ap);
 966 }
 967 
 968 void staticBufferStream::print_cr(const char* format, ...) {
 969   va_list ap;
 970   va_start(ap, format);
 971   size_t len;
 972   const char* str = do_vsnprintf(_buffer, _buflen, format, ap, true, len);
 973   write(str, len);
 974   va_end(ap);
 975 }
 976 
 977 void staticBufferStream::vprint(const char *format, va_list argptr) {
 978   size_t len;
 979   const char* str = do_vsnprintf(_buffer, _buflen, format, argptr, false, len);
 980   write(str, len);
 981 }
 982 
 983 void staticBufferStream::vprint_cr(const char* format, va_list argptr) {
 984   size_t len;
 985   const char* str = do_vsnprintf(_buffer, _buflen, format, argptr, true, len);
 986   write(str, len);
 987 }
 988 
 989 bufferedStream::bufferedStream(size_t initial_size, size_t bufmax) : outputStream() {
 990   buffer_length = initial_size;
 991   buffer        = NEW_C_HEAP_ARRAY(char, buffer_length, mtInternal);
 992   buffer_pos    = 0;
 993   buffer_fixed  = false;
 994   buffer_max    = bufmax;
 995 }
 996 
 997 bufferedStream::bufferedStream(char* fixed_buffer, size_t fixed_buffer_size, size_t bufmax) : outputStream() {
 998   buffer_length = fixed_buffer_size;
 999   buffer        = fixed_buffer;
1000   buffer_pos    = 0;
1001   buffer_fixed  = true;
1002   buffer_max    = bufmax;
1003 }
1004 
1005 void bufferedStream::write(const char* s, size_t len) {
1006 
1007   if(buffer_pos + len > buffer_max) {
1008     flush();
1009   }
1010 
1011   size_t end = buffer_pos + len;
1012   if (end >= buffer_length) {
1013     if (buffer_fixed) {
1014       // if buffer cannot resize, silently truncate
1015       len = buffer_length - buffer_pos - 1;
1016     } else {
1017       // For small overruns, double the buffer.  For larger ones,
1018       // increase to the requested size.
1019       if (end < buffer_length * 2) {
1020         end = buffer_length * 2;
1021       }
1022       buffer = REALLOC_C_HEAP_ARRAY(char, buffer, end, mtInternal);
1023       buffer_length = end;
1024     }
1025   }
1026   memcpy(buffer + buffer_pos, s, len);
1027   buffer_pos += len;
1028   update_position(s, len);
1029 }
1030 
1031 char* bufferedStream::as_string() {
1032   char* copy = NEW_RESOURCE_ARRAY(char, buffer_pos+1);
1033   strncpy(copy, buffer, buffer_pos);
1034   copy[buffer_pos] = 0;  // terminating null
1035   return copy;
1036 }
1037 
1038 bufferedStream::~bufferedStream() {
1039   if (!buffer_fixed) {
1040     FREE_C_HEAP_ARRAY(char, buffer, mtInternal);
1041   }
1042 }
1043 
1044 #ifndef PRODUCT
1045 
1046 #if defined(SOLARIS) || defined(LINUX) || defined(_ALLBSD_SOURCE)
1047 #include <sys/types.h>
1048 #include <sys/socket.h>
1049 #include <netinet/in.h>
1050 #include <arpa/inet.h>
1051 #endif
1052 
1053 // Network access
1054 networkStream::networkStream() : bufferedStream(1024*10, 1024*10) {
1055 
1056   _socket = -1;
1057 
1058   int result = os::socket(AF_INET, SOCK_STREAM, 0);
1059   if (result <= 0) {
1060     assert(false, "Socket could not be created!");
1061   } else {
1062     _socket = result;
1063   }
1064 }
1065 
1066 int networkStream::read(char *buf, size_t len) {
1067   return os::recv(_socket, buf, (int)len, 0);
1068 }
1069 
1070 void networkStream::flush() {
1071   if (size() != 0) {
1072     int result = os::raw_send(_socket, (char *)base(), size(), 0);
1073     assert(result != -1, "connection error");
1074     assert(result == (int)size(), "didn't send enough data");
1075   }
1076   reset();
1077 }
1078 
1079 networkStream::~networkStream() {
1080   close();
1081 }
1082 
1083 void networkStream::close() {
1084   if (_socket != -1) {
1085     flush();
1086     os::socket_close(_socket);
1087     _socket = -1;
1088   }
1089 }
1090 
1091 bool networkStream::connect(const char *ip, short port) {
1092 
1093   struct sockaddr_in server;
1094   server.sin_family = AF_INET;
1095   server.sin_port = htons(port);
1096 
1097   server.sin_addr.s_addr = inet_addr(ip);
1098   if (server.sin_addr.s_addr == (uint32_t)-1) {
1099     struct hostent* host = os::get_host_by_name((char*)ip);
1100     if (host != NULL) {
1101       memcpy(&server.sin_addr, host->h_addr_list[0], host->h_length);
1102     } else {
1103       return false;
1104     }
1105   }
1106 
1107 
1108   int result = os::connect(_socket, (struct sockaddr*)&server, sizeof(struct sockaddr_in));
1109   return (result >= 0);
1110 }
1111 
1112 #endif