1 /*
   2  * Copyright (c) 2011, 2018, 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 "jfr/utilities/jfrTimeConverter.hpp"
  27 #include "jfr/utilities/jfrTime.hpp"
  28 #include "runtime/os.hpp"
  29 
  30 static double ft_counter_to_nanos_factor = .0;
  31 static double nanos_to_ft_counter_factor = .0;
  32 static double os_counter_to_nanos_factor = .0;
  33 static double nanos_to_os_counter_factor = .0;
  34 
  35 const double JfrTimeConverter::NANOS_PER_SEC      = 1000000000.0;
  36 const double JfrTimeConverter::NANOS_PER_MILLISEC = 1000000.0;
  37 const double JfrTimeConverter::NANOS_PER_MICROSEC = 1000.0;
  38 
  39 static bool initialized = false;
  40 
  41 void JfrTimeConverter::initialize() {
  42   if (!initialized) {
  43     nanos_to_os_counter_factor = (double)os::elapsed_frequency() / NANOS_PER_SEC;
  44     assert(nanos_to_os_counter_factor != .0, "error in conversion!");
  45     os_counter_to_nanos_factor = (double)1.0 / nanos_to_os_counter_factor;
  46     assert(os_counter_to_nanos_factor != .0, "error in conversion!");
  47     if (JfrTime::is_ft_enabled()) {
  48       nanos_to_ft_counter_factor = (double)JfrTime::frequency() / NANOS_PER_SEC;
  49       assert(nanos_to_ft_counter_factor != .0, "error in conversion!");
  50       ft_counter_to_nanos_factor = (double)1.0 / nanos_to_ft_counter_factor;
  51       assert(ft_counter_to_nanos_factor != .0, "error in conversion!");
  52     }
  53     initialized = true;
  54   }
  55 }
  56 
  57 double JfrTimeConverter::counter_to_nano_multiplier(bool is_os_time) {
  58   if (!initialized) {
  59     initialize();
  60   }
  61   return JfrTime::is_ft_enabled() && !is_os_time ? ft_counter_to_nanos_factor : os_counter_to_nanos_factor;
  62 }
  63 
  64 double JfrTimeConverter::nano_to_counter_multiplier(bool is_os_time) {
  65   if (!initialized) {
  66     initialize();
  67   }
  68   return JfrTime::is_ft_enabled() && !is_os_time ? nanos_to_ft_counter_factor : nanos_to_os_counter_factor;
  69 }
  70 
  71 double JfrTimeConverter::counter_to_nanos_internal(jlong c, bool is_os_time) {
  72   return (double)c * counter_to_nano_multiplier(is_os_time);
  73 }
  74 
  75 double JfrTimeConverter::counter_to_millis_internal(jlong c, bool is_os_time) {
  76   return (counter_to_nanos_internal(c, is_os_time) / NANOS_PER_MILLISEC);
  77 }
  78 
  79 jlong JfrTimeConverter::counter_to_nanos(jlong c, bool is_os_time) {
  80   return (jlong)counter_to_nanos_internal(c, is_os_time);
  81 }
  82 
  83 jlong JfrTimeConverter::counter_to_millis(jlong c, bool is_os_time) {
  84   return (jlong)counter_to_millis_internal(c, is_os_time);
  85 }
  86 
  87 jlong JfrTimeConverter::nanos_to_countertime(jlong nanos, bool as_os_time) {
  88   return nanos <= 0 ? 0 : (jlong)((double)nanos * nano_to_counter_multiplier(as_os_time));
  89 }