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/jfrTime.hpp"
  27 #include "runtime/os.hpp"
  28 #if defined(X86) && !defined(ZERO)
  29 #include "rdtsc_x86.hpp"
  30 #endif
  31 
  32 bool JfrTime::_ft_enabled = false;
  33 
  34 bool JfrTime::initialize() {
  35   static bool initialized = false;
  36   if (!initialized) {
  37 #if defined(X86) && !defined(ZERO)
  38     _ft_enabled = Rdtsc::initialize();
  39 #else
  40     _ft_enabled = false;
  41 #endif
  42     initialized = true;
  43   }
  44   return initialized;
  45 }
  46 
  47 bool JfrTime::is_ft_supported() {
  48 #if defined(X86) && !defined(ZERO)
  49   return Rdtsc::is_supported();
  50 #else
  51   return false;
  52 #endif
  53 }
  54 
  55 
  56 const void* JfrTime::time_function() {
  57 #if defined(X86) && !defined(ZERO)
  58   return _ft_enabled ? (const void*)Rdtsc::elapsed_counter : (const void*)os::elapsed_counter;
  59 #else
  60   return (const void*)os::elapsed_counter;
  61 #endif
  62 }
  63 
  64 jlong JfrTime::frequency() {
  65 #if defined(X86) && !defined(ZERO)
  66   return _ft_enabled ? Rdtsc::frequency() : os::elapsed_frequency();
  67 #else
  68   return os::elapsed_frequency();
  69 #endif
  70 }
  71