Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 1997-2006 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.

  *

  */

 #include "incls/_precompiled.incl"

 #include "incls/_events.cpp.incl"

 #ifndef PRODUCT

 ////////////////////////////////////////////////////////////////////////////

 // Event

 typedef u4 EventID;

 class Event VALUE_OBJ_CLASS_SPEC  {

  private:

   jlong       _time_tick;

   intx        _thread_id;

   const char* _format;

   int         _indent;

   intptr_t    _arg_1;

   intptr_t    _arg_2;

   intptr_t    _arg_3;

   // only EventBuffer::add_event() can assign event id

   friend class EventBuffer;

   EventID     _id;

  public:

   void clear() { _format = NULL; }

   EventID id() const { return _id; }

   void fill(int indent, const char* format, intptr_t arg_1, intptr_t arg_2, intptr_t arg_3) {

     _format = format;

     _arg_1  = arg_1;

     _arg_2  = arg_2;

     _arg_3  = arg_3;

     _indent = indent;

     _thread_id = os::current_thread_id();

     _time_tick = os::elapsed_counter();

   }

   void print_on(outputStream *st) {

     if (_format == NULL) return;

     st->print("  %d", _thread_id);

     st->print("  %3.2g   ", (double)_time_tick / os::elapsed_frequency());

     st->fill_to(20);

     for (int index = 0; index < _indent; index++) {

       st->print("| ");

     }

     st->print_cr(_format, _arg_1, _arg_2, _arg_3);

   }

 };

 ////////////////////////////////////////////////////////////////////////////

 // EventBuffer

 //

 // Simple lock-free event queue. Every event has a unique 32-bit id.

 // It's fine if two threads add events at the same time, because they

 // will get different event id, and then write to different buffer location.

 // However, it is assumed that add_event() is quick enough (or buffer size

 // is big enough), so when one thread is adding event, there can't be more

 // than "size" events created by other threads; otherwise we'll end up having

 // two threads writing to the same location.

 class EventBuffer : AllStatic {

  private:

   static Event* buffer;

   static int    size;

   static jint   indent;

   static volatile EventID _current_event_id;

   static EventID get_next_event_id() {

     return (EventID)Atomic::add(1, (jint*)&_current_event_id);

   }

  public:

   static void inc_indent() { Atomic::inc(&indent); }

   static void dec_indent() { Atomic::dec(&indent); }

   static bool get_event(EventID id, Event* event) {

     int index = (int)(id % size);

     if (buffer[index].id() == id) {

       memcpy(event, &buffer[index], sizeof(Event));

       // check id again; if buffer[index] is being updated by another thread,

       // event->id() will contain different value.

       return (event->id() == id);

     } else {

       // id does not match - id is invalid, or event is overwritten

       return false;

     }

   }

   // add a new event to the queue; if EventBuffer is full, this call will

   // overwrite the oldest event in the queue

   static EventID add_event(const char* format,

                            intptr_t arg_1, intptr_t arg_2, intptr_t arg_3) {

     // assign a unique id

     EventID id = get_next_event_id();

     // event will be copied to buffer[index]

     int index = (int)(id % size);

     // first, invalidate id, buffer[index] can't have event with id = index + 2

     buffer[index]._id = index + 2;

     // make sure everyone has seen that buffer[index] is invalid

     OrderAccess::fence();

     // ... before updating its value

     buffer[index].fill(indent, format, arg_1, arg_2, arg_3);

     // finally, set up real event id, now buffer[index] contains valid event

     OrderAccess::release_store(&(buffer[index]._id), id);

     return id;

   }

   static void print_last(outputStream *st, int number) {

     st->print_cr("[Last %d events in the event buffer]", number);

     st->print_cr("-<thd>-<elapsed sec>-<description>---------------------");

     int count = 0;

     EventID id = _current_event_id;

     while (count < number) {

       Event event;

       if (get_event(id, &event)) {

          event.print_on(st);

       }

       id--;

       count++;

     }

   }

   static void print_all(outputStream* st) {

     print_last(st, size);

   }

   static void init() {

     // Allocate the event buffer

     size   = EventLogLength;

     buffer = NEW_C_HEAP_ARRAY(Event, size);

     _current_event_id = 0;

     // Clear the event buffer

     for (int index = 0; index < size; index++) {

       buffer[index]._id = index + 1;       // index + 1 is invalid id

       buffer[index].clear();

     }

   }

 };

 Event*           EventBuffer::buffer;

 int              EventBuffer::size;

 volatile EventID EventBuffer::_current_event_id;

 int              EventBuffer::indent;

 ////////////////////////////////////////////////////////////////////////////

 // Events

 // Events::log() is safe for signal handlers

 void Events::log(const char* format, ...) {

   if (LogEvents) {

     va_list ap;

     va_start(ap, format);

     intptr_t arg_1 = va_arg(ap, intptr_t);

     intptr_t arg_2 = va_arg(ap, intptr_t);

     intptr_t arg_3 = va_arg(ap, intptr_t);

     va_end(ap);

     EventBuffer::add_event(format, arg_1, arg_2, arg_3);

   }

 }

 void Events::print_all(outputStream *st) {

   EventBuffer::print_all(st);

 }

 void Events::print_last(outputStream *st, int number) {

   EventBuffer::print_last(st, number);

 }

 ///////////////////////////////////////////////////////////////////////////

 // EventMark

 EventMark::EventMark(const char* format, ...) {

   if (LogEvents) {

     va_list ap;

     va_start(ap, format);

     intptr_t arg_1 = va_arg(ap, intptr_t);

     intptr_t arg_2 = va_arg(ap, intptr_t);

     intptr_t arg_3 = va_arg(ap, intptr_t);

     va_end(ap);

     EventBuffer::add_event(format, arg_1, arg_2, arg_3);

     EventBuffer::inc_indent();

   }

 }

 EventMark::~EventMark() {

   if (LogEvents) {

     EventBuffer::dec_indent();

     EventBuffer::add_event("done", 0, 0, 0);

   }

 }

 ///////////////////////////////////////////////////////////////////////////

 void eventlog_init() {

   EventBuffer::init();

 }

 int print_all_events(outputStream *st) {

   EventBuffer::print_all(st);

   return 1;

 }

 #else

 void eventlog_init() {}

 int print_all_events(outputStream *st) { return 0; }

 #endif // PRODUCT