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_ABSTRACT_VM_VERSION_HPP

    26 #define SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP

    27 

    28 #include "memory/allocation.hpp"  // For declaration of class AllStatic

    29 #include "utilities/globalDefinitions.hpp"

    30 

    31 typedef enum {

    32   NoDetectedVirtualization,

    33   XenHVM,

    34   KVM,

    35   VMWare,

    36   HyperV,

    37   PowerVM, // on AIX or Linux ppc64(le)

    38   PowerFullPartitionMode, // on Linux ppc64(le)

    39   PowerKVM

    40 } VirtualizationType;

    41 

    42 class outputStream;

    43 

    44 // Abstract_VM_Version provides information about the VM.

    45 

    46 class Abstract_VM_Version: AllStatic {

    47   friend class VMStructs;

    48   friend class JVMCIVMStructs;

    49 

    50  protected:

    51   static const char*  _s_vm_release;

    52   static const char*  _s_internal_vm_info_string;

    53 

    54   // CPU feature flags.

    55   static uint64_t _features;

    56   static const char* _features_string;

    57 

    58   // These are set by machine-dependent initializations

    59   static bool         _supports_cx8;

    60   static bool         _supports_atomic_getset4;

    61   static bool         _supports_atomic_getset8;

    62   static bool         _supports_atomic_getadd4;

    63   static bool         _supports_atomic_getadd8;

    64   static unsigned int _logical_processors_per_package;

    65   static unsigned int _L1_data_cache_line_size;

    66   static int          _vm_major_version;

    67   static int          _vm_minor_version;

    68   static int          _vm_security_version;

    69   static int          _vm_patch_version;

    70   static int          _vm_build_number;

    71   static unsigned int _data_cache_line_flush_size;

    72 

    73   static VirtualizationType _detected_virtualization;

    74 

    75  public:

    76   // Called as part of the runtime services initialization which is

    77   // called from the management module initialization (via init_globals())

    78   // after argument parsing and attaching of the main thread has

    79   // occurred.  Examines a variety of the hardware capabilities of

    80   // the platform to determine which features can be used to execute the

    81   // program.

    82   static void initialize() { }

    83 

    84   // This allows for early initialization of VM_Version information

    85   // that may be needed later in the initialization sequence but before

    86   // full VM_Version initialization is possible. It can not depend on any

    87   // other part of the VM being initialized when called. Platforms that

    88   // need to specialize this define VM_Version::early_initialize().

    89   static void early_initialize() { }

    90 

    91   // Called to initialize VM variables needing initialization

    92   // after command line parsing. Platforms that need to specialize

    93   // this should define VM_Version::init_before_ergo().

    94   static void init_before_ergo() {}

    95 

    96   // Name

    97   static const char* vm_name();

    98   // Vendor

    99   static const char* vm_vendor();

   100   // VM version information string printed by launcher (java -version)

   101   static const char* vm_info_string();

   102   static const char* vm_release();

   103   static const char* vm_platform_string();

   104   static const char* vm_build_user();

   105 

   106   static int vm_major_version()               { return _vm_major_version; }

   107   static int vm_minor_version()               { return _vm_minor_version; }

   108   static int vm_security_version()            { return _vm_security_version; }

   109   static int vm_patch_version()               { return _vm_patch_version; }

   110   static int vm_build_number()                { return _vm_build_number; }

   111 

   112   // Gets the jvm_version_info.jvm_version defined in jvm.h

   113   static unsigned int jvm_version();

   114 

   115   // Internal version providing additional build information

   116   static const char* internal_vm_info_string();

   117   static const char* jre_release_version();

   118   static const char* jdk_debug_level();

   119   static const char* printable_jdk_debug_level();

   120 

   121   static uint64_t features() {

   122     return _features;

   123   }

   124 

   125   static const char* features_string() {

   126     return _features_string;

   127   }

   128 

   129   static VirtualizationType get_detected_virtualization() {

   130     return _detected_virtualization;

   131   }

   132 

   133   // platforms that need to specialize this

   134   // define VM_Version::print_platform_virtualization_info()

   135   static void print_platform_virtualization_info(outputStream*) { }

   136 

   137   // does HW support an 8-byte compare-exchange operation?

   138   static bool supports_cx8()  {

   139 #ifdef SUPPORTS_NATIVE_CX8

   140     return true;

   141 #else

   142     return _supports_cx8;

   143 #endif

   144   }

   145   // does HW support atomic get-and-set or atomic get-and-add?  Used

   146   // to guide intrinsification decisions for Unsafe atomic ops

   147   static bool supports_atomic_getset4()  {return _supports_atomic_getset4;}

   148   static bool supports_atomic_getset8()  {return _supports_atomic_getset8;}

   149   static bool supports_atomic_getadd4()  {return _supports_atomic_getadd4;}

   150   static bool supports_atomic_getadd8()  {return _supports_atomic_getadd8;}

   151 

   152   static unsigned int logical_processors_per_package() {

   153     return _logical_processors_per_package;

   154   }

   155 

   156   static unsigned int L1_data_cache_line_size() {

   157     return _L1_data_cache_line_size;

   158   }

   159 

   160   // the size in bytes of a data cache line flushed by a flush

   161   // operation which should be a power of two or zero if cache line

   162   // writeback is not supported by the current os_cpu combination

   163   static unsigned int data_cache_line_flush_size() {

   164     return _data_cache_line_flush_size;

   165   }

   166 

   167   // returns true if and only if cache line writeback is supported

   168   static bool supports_data_cache_line_flush() {

   169     return _data_cache_line_flush_size != 0;

   170   }

   171 

   172   // ARCH specific policy for the BiasedLocking

   173   static bool use_biased_locking()  { return true; }

   174 

   175   // Number of page sizes efficiently supported by the hardware.  Most chips now

   176   // support two sizes, thus this default implementation.  Processor-specific

   177   // subclasses should define new versions to hide this one as needed.  Note

   178   // that the O/S may support more sizes, but at most this many are used.

   179   static uint page_size_count() { return 2; }

   180 

   181   // Denominator for computing default ParallelGCThreads for machines with

   182   // a large number of cores.

   183   static uint parallel_worker_threads_denominator() { return 8; }

   184 

   185   // Does this CPU support spin wait instruction?

   186   static bool supports_on_spin_wait() { return false; }

   187 

   188   // Does platform support fast class initialization checks for static methods?

   189   static bool supports_fast_class_init_checks() { return false; }

   190 

   191   static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);

   192 };

   193 

   194 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP