1 /*
   2  * Copyright (c) 1997, 2019, 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 #ifndef SHARE_RUNTIME_VM_VERSION_HPP
  26 #define SHARE_RUNTIME_VM_VERSION_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "utilities/ostream.hpp"
  30 #include "utilities/macros.hpp"
  31 











  32 // VM_Version provides information about the VM.
  33 
  34 class Abstract_VM_Version: AllStatic {
  35   friend class VMStructs;
  36   friend class JVMCIVMStructs;
  37 
  38  protected:
  39   static const char*  _s_vm_release;
  40   static const char*  _s_internal_vm_info_string;
  41 
  42   // CPU feature flags.
  43   static uint64_t _features;
  44   static const char* _features_string;
  45 
  46   // These are set by machine-dependent initializations
  47   static bool         _supports_cx8;
  48   static bool         _supports_atomic_getset4;
  49   static bool         _supports_atomic_getset8;
  50   static bool         _supports_atomic_getadd4;
  51   static bool         _supports_atomic_getadd8;
  52   static unsigned int _logical_processors_per_package;
  53   static unsigned int _L1_data_cache_line_size;
  54   static int          _vm_major_version;
  55   static int          _vm_minor_version;
  56   static int          _vm_security_version;
  57   static int          _vm_patch_version;
  58   static int          _vm_build_number;
  59 


  60  public:
  61   // Called as part of the runtime services initialization which is
  62   // called from the management module initialization (via init_globals())
  63   // after argument parsing and attaching of the main thread has
  64   // occurred.  Examines a variety of the hardware capabilities of
  65   // the platform to determine which features can be used to execute the
  66   // program.
  67   static void initialize() { }
  68 
  69   // This allows for early initialization of VM_Version information
  70   // that may be needed later in the initialization sequence but before
  71   // full VM_Version initialization is possible. It can not depend on any
  72   // other part of the VM being initialized when called. Platforms that
  73   // need to specialize this define VM_Version::early_initialize().
  74   static void early_initialize() { }
  75 
  76   // Called to initialize VM variables needing initialization
  77   // after command line parsing. Platforms that need to specialize
  78   // this should define VM_Version::init_before_ergo().
  79   static void init_before_ergo() {}
  80 
  81   // Name
  82   static const char* vm_name();
  83   // Vendor
  84   static const char* vm_vendor();
  85   // VM version information string printed by launcher (java -version)
  86   static const char* vm_info_string();
  87   static const char* vm_release();
  88   static const char* vm_platform_string();
  89   static const char* vm_build_user();
  90 
  91   static int vm_major_version()               { return _vm_major_version; }
  92   static int vm_minor_version()               { return _vm_minor_version; }
  93   static int vm_security_version()            { return _vm_security_version; }
  94   static int vm_patch_version()               { return _vm_patch_version; }
  95   static int vm_build_number()                { return _vm_build_number; }
  96 
  97   // Gets the jvm_version_info.jvm_version defined in jvm.h
  98   static unsigned int jvm_version();
  99 
 100   // Internal version providing additional build information
 101   static const char* internal_vm_info_string();
 102   static const char* jre_release_version();
 103   static const char* jdk_debug_level();
 104   static const char* printable_jdk_debug_level();
 105 
 106   static uint64_t features() {
 107     return _features;
 108   }
 109 
 110   static const char* features_string() {
 111     return _features_string;
 112   }
 113 








 114   // does HW support an 8-byte compare-exchange operation?
 115   static bool supports_cx8()  {
 116 #ifdef SUPPORTS_NATIVE_CX8
 117     return true;
 118 #else
 119     return _supports_cx8;
 120 #endif
 121   }
 122   // does HW support atomic get-and-set or atomic get-and-add?  Used
 123   // to guide intrinsification decisions for Unsafe atomic ops
 124   static bool supports_atomic_getset4()  {return _supports_atomic_getset4;}
 125   static bool supports_atomic_getset8()  {return _supports_atomic_getset8;}
 126   static bool supports_atomic_getadd4()  {return _supports_atomic_getadd4;}
 127   static bool supports_atomic_getadd8()  {return _supports_atomic_getadd8;}
 128 
 129   static unsigned int logical_processors_per_package() {
 130     return _logical_processors_per_package;
 131   }
 132 
 133   static unsigned int L1_data_cache_line_size() {
 134     return _L1_data_cache_line_size;
 135   }
 136 
 137   // ARCH specific policy for the BiasedLocking
 138   static bool use_biased_locking()  { return true; }
 139 
 140   // Number of page sizes efficiently supported by the hardware.  Most chips now
 141   // support two sizes, thus this default implementation.  Processor-specific
 142   // subclasses should define new versions to hide this one as needed.  Note
 143   // that the O/S may support more sizes, but at most this many are used.
 144   static uint page_size_count() { return 2; }
 145 
 146   // Denominator for computing default ParallelGCThreads for machines with
 147   // a large number of cores.
 148   static uint parallel_worker_threads_denominator() { return 8; }
 149 
 150   // Does this CPU support spin wait instruction?
 151   static bool supports_on_spin_wait() { return false; }





 152 };
 153 
 154 #include CPU_HEADER(vm_version)
 155 
 156 #endif // SHARE_RUNTIME_VM_VERSION_HPP
--- EOF ---