jdk8-mips64-public/hotspot: src/share/vm/utilities/ostream.hpp@c96030fff130 (annotated)

src/share/vm/utilities/ostream.hpp@c96030fff130 (annotated)

src/share/vm/utilities/ostream.hpp

Thu, 20 Nov 2008 16:56:09 -0800

author: ysr
date: Thu, 20 Nov 2008 16:56:09 -0800
changeset 888: c96030fff130
parent 791: 1ee8caae33af
child 1907: c18cbe5936b8
permissions: -rw-r--r--

6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa

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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/utilities/ostream.hpp@c96030fff130 (annotated)

src/share/vm/utilities/ostream.hpp