1 /*
   2  * Copyright (c) 2013, 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/jfrTraceTime.hpp"
  27 #include "runtime/os.hpp"
  28 #ifdef X86
  29 #include "rdtsc_x86.hpp"
  30 #endif
  31 
  32 #include OS_HEADER_INLINE(os)
  33 
  34 bool JfrTraceTime::_ft_enabled = false;
  35 
  36 bool JfrTraceTime::initialize() {
  37   static bool initialized = false;
  38   if (!initialized) {
  39 #ifdef X86
  40     _ft_enabled = Rdtsc::initialize();
  41 #else
  42     _ft_enabled = false;
  43 #endif
  44     initialized = true;
  45   }
  46   return initialized;
  47 }
  48 
  49 bool JfrTraceTime::is_ft_supported() {
  50 #ifdef X86
  51   return Rdtsc::is_supported();
  52 #else
  53   return false;
  54 #endif
  55 }
  56 
  57 JfrTraceTime::JfrTraceTime() {
  58 #ifdef X86
  59   _ticks = _ft_enabled ? Rdtsc::elapsed_counter() : os::elapsed_counter();
  60 #else
  61   _ticks = os::elapsed_counter();
  62 #endif
  63 }
  64 
  65 JfrTraceTime JfrTraceTime::now() {
  66   return JfrTraceTime();
  67 }
  68 
  69 void JfrTraceTime::stamp() {
  70   _ticks = now().value();
  71 }
  72 
  73 const void* JfrTraceTime::time_function() {
  74 #ifdef X86
  75   return _ft_enabled ? (const void*)Rdtsc::elapsed_counter : (const void*)os::elapsed_counter;
  76 #else
  77   return (const void*)os::elapsed_counter;
  78 #endif
  79 }
  80 
  81 jlong JfrTraceTime::frequency() {
  82 #ifdef X86
  83   return _ft_enabled ? Rdtsc::frequency() : os::elapsed_frequency();
  84 #else
  85   return os::elapsed_frequency();
  86 #endif
  87 }
  88