hotspot/src/share/vm/utilities/ostream.hpp
author trims
Fri, 11 Jul 2008 01:14:44 -0700
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child 1388 3677f5f3d66b
permissions -rw-r--r--
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/*
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 * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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// Output streams for printing
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//
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// Printing guidelines:
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// Where possible, please use tty->print() and tty->print_cr().
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// For product mode VM warnings use warning() which internally uses tty.
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// In places where tty is not initialized yet or too much overhead,
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// we may use jio_printf:
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//     jio_fprintf(defaultStream::output_stream(), "Message");
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// This allows for redirection via -XX:+DisplayVMOutputToStdout and
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// -XX:+DisplayVMOutputToStderr
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class outputStream : public ResourceObj {
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   int _indentation; // current indentation
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   int _width;       // width of the page
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   int _position;    // position on the current line
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   int _newlines;    // number of '\n' output so far
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   julong _precount; // number of chars output, less _position
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   TimeStamp _stamp; // for time stamps
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   void update_position(const char* s, size_t len);
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   static const char* do_vsnprintf(char* buffer, size_t buflen,
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                                   const char* format, va_list ap,
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                                   bool add_cr,
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                                   size_t& result_len);
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   // creation
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   outputStream(int width = 80);
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   outputStream(int width, bool has_time_stamps);
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   // indentation
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   void indent();
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   void inc() { _indentation++; };
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   void dec() { _indentation--; };
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   int  indentation() const    { return _indentation; }
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   void set_indentation(int i) { _indentation = i;    }
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   void fill_to(int col);
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   void move_to(int col, int slop = 6, int min_space = 2);
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   // sizing
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   int width()    const { return _width;    }
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   int position() const { return _position; }
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   int newlines() const { return _newlines; }
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   julong count() const { return _precount + _position; }
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   void set_count(julong count) { _precount = count - _position; }
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   void set_position(int pos)   { _position = pos; }
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   // printing
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   void print(const char* format, ...);
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   void print_cr(const char* format, ...);
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   void vprint(const char *format, va_list argptr);
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   void vprint_cr(const char* format, va_list argptr);
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   void print_raw(const char* str)            { write(str, strlen(str)); }
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   void print_raw(const char* str, int len)   { write(str,         len); }
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   void print_raw_cr(const char* str)         { write(str, strlen(str)); cr(); }
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   void print_raw_cr(const char* str, int len){ write(str,         len); cr(); }
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   void put(char ch);
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   void sp(int count = 1);
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   void cr();
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   void bol() { if (_position > 0)  cr(); }
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   // Time stamp
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   TimeStamp& time_stamp() { return _stamp; }
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   void stamp();
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   // Date stamp
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   void date_stamp(bool guard, const char* prefix, const char* suffix);
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   // A simplified call that includes a suffix of ": "
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   void date_stamp(bool guard) {
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     date_stamp(guard, "", ": ");
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   }
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   // portable printing of 64 bit integers
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   void print_jlong(jlong value);
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   void print_julong(julong value);
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   // flushing
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   virtual void flush() {}
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   virtual void write(const char* str, size_t len) = 0;
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   virtual ~outputStream() {}  // close properly on deletion
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   void dec_cr() { dec(); cr(); }
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   void inc_cr() { inc(); cr(); }
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};
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// standard output
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                                // ANSI C++ name collision
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extern outputStream* tty;           // tty output
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extern outputStream* gclog_or_tty;  // stream for gc log if -Xloggc:<f>, or tty
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// advisory locking for the shared tty stream:
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class ttyLocker: StackObj {
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  intx _holder;
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  static intx  hold_tty();                // returns a "holder" token
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  static void  release_tty(intx holder);  // must witness same token
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  static void  break_tty_lock_for_safepoint(intx holder);
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  ttyLocker()  { _holder = hold_tty(); }
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  ~ttyLocker() { release_tty(_holder); }
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};
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// for writing to strings; buffer will expand automatically
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class stringStream : public outputStream {
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  char*  buffer;
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  size_t buffer_pos;
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  size_t buffer_length;
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  bool   buffer_fixed;
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  stringStream(size_t initial_bufsize = 256);
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  stringStream(char* fixed_buffer, size_t fixed_buffer_size);
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  ~stringStream();
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  virtual void write(const char* c, size_t len);
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  size_t      size() { return buffer_pos; }
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  const char* base() { return buffer; }
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  void  reset() { buffer_pos = 0; _precount = 0; _position = 0; }
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  char* as_string();
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};
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class fileStream : public outputStream {
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  FILE* _file;
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  bool  _need_close;
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  fileStream(const char* file_name);
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  fileStream(FILE* file) { _file = file; _need_close = false; }
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  ~fileStream();
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  bool is_open() const { return _file != NULL; }
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  virtual void write(const char* c, size_t len);
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  void flush();
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};
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// unlike fileStream, fdStream does unbuffered I/O by calling
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// open() and write() directly. It is async-safe, but output
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// from multiple thread may be mixed together. Used by fatal
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// error handler.
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class fdStream : public outputStream {
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  int  _fd;
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  bool _need_close;
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  fdStream(const char* file_name);
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  fdStream(int fd = -1) { _fd = fd; _need_close = false; }
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  ~fdStream();
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  bool is_open() const { return _fd != -1; }
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  void set_fd(int fd) { _fd = fd; _need_close = false; }
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  int fd() const { return _fd; }
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  virtual void write(const char* c, size_t len);
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  void flush() {};
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};
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void ostream_init();
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void ostream_init_log();
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void ostream_exit();
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void ostream_abort();
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// staticBufferStream uses a user-supplied buffer for all formatting.
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// Used for safe formatting during fatal error handling.  Not MT safe.
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// Do not share the stream between multiple threads.
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class staticBufferStream : public outputStream {
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  char* _buffer;
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  size_t _buflen;
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  outputStream* _outer_stream;
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  staticBufferStream(char* buffer, size_t buflen,
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                     outputStream *outer_stream);
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  ~staticBufferStream() {};
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  virtual void write(const char* c, size_t len);
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  void flush();
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  void print(const char* format, ...);
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  void print_cr(const char* format, ...);
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  void vprint(const char *format, va_list argptr);
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  void vprint_cr(const char* format, va_list argptr);
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};
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// In the non-fixed buffer case an underlying buffer will be created and
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// managed in C heap. Not MT-safe.
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class bufferedStream : public outputStream {
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 protected:
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  char*  buffer;
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  size_t buffer_pos;
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  size_t buffer_max;
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  size_t buffer_length;
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  bool   buffer_fixed;
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 public:
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  bufferedStream(size_t initial_bufsize = 256, size_t bufmax = 1024*1024*10);
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  bufferedStream(char* fixed_buffer, size_t fixed_buffer_size, size_t bufmax = 1024*1024*10);
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  ~bufferedStream();
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  virtual void write(const char* c, size_t len);
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  size_t      size() { return buffer_pos; }
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  const char* base() { return buffer; }
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  void  reset() { buffer_pos = 0; _precount = 0; _position = 0; }
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  char* as_string();
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};
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#define O_BUFLEN 2000   // max size of output of individual print() methods
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#ifndef PRODUCT
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class networkStream : public bufferedStream {
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  private:
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    int _socket;
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  public:
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    networkStream();
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    ~networkStream();
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    bool connect(const char *host, short port);
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    bool is_open() const { return _socket != -1; }
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    int read(char *buf, size_t len);
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    void close();
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    virtual void flush();
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};
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#endif