jdk8-mips64-public/hotspot: src/share/vm/utilities/ostream.hpp@36c186bcc085 (annotated)

src/share/vm/utilities/ostream.hpp@36c186bcc085 (annotated)

src/share/vm/utilities/ostream.hpp

Mon, 03 Jan 2011 14:09:11 -0500

author: coleenp
date: Mon, 03 Jan 2011 14:09:11 -0500
changeset 2418: 36c186bcc085
parent 2314: f95d63e2154a
child 2515: d8a72fbc4be7
permissions: -rw-r--r--

6302804: Hotspot VM dies ungraceful death when C heap is exhausted in various places.
Summary: enhance the error reporting mechanism to help user to fix the problem rather than making it look like a VM error.
Reviewed-by: kvn, kamg

 /*
  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_UTILITIES_OSTREAM_HPP
 #define SHARE_VM_UTILITIES_OSTREAM_HPP
 #include "memory/allocation.hpp"
 #include "runtime/timer.hpp"
 // 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
 #endif // SHARE_VM_UTILITIES_OSTREAM_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/utilities/ostream.hpp@36c186bcc085 (annotated)

src/share/vm/utilities/ostream.hpp