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 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 #ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP

 #define SHARE_VM_RUNTIME_VM_VERSION_HPP

 #include "memory/allocation.hpp"

 #include "utilities/ostream.hpp"

 // VM_Version provides information about the VM.

 class Abstract_VM_Version: AllStatic {

  protected:

   friend class VMStructs;

   static const char*  _s_vm_release;

   static const char*  _s_internal_vm_info_string;

   // These are set by machine-dependent initializations

   static bool         _supports_cx8;

   static bool         _supports_atomic_getset4;

   static bool         _supports_atomic_getset8;

   static bool         _supports_atomic_getadd4;

   static bool         _supports_atomic_getadd8;

   static unsigned int _logical_processors_per_package;

   static int          _vm_major_version;

   static int          _vm_minor_version;

   static int          _vm_build_number;

   static bool         _initialized;

   static int          _parallel_worker_threads;

   static bool         _parallel_worker_threads_initialized;

   static int          _reserve_for_allocation_prefetch;

   static unsigned int nof_parallel_worker_threads(unsigned int num,

                                                   unsigned int dem,

                                                   unsigned int switch_pt);

  public:

   static void initialize();

   // This allows for early initialization of VM_Version information

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

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

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

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

   static void early_initialize() { }

   // Name

   static const char* vm_name();

   // Vendor

   static const char* vm_vendor();

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

   static const char* vm_info_string();

   static const char* vm_release();

   static const char* vm_platform_string();

   static const char* vm_build_user();

   static int vm_major_version()               { assert(_initialized, "not initialized"); return _vm_major_version; }

   static int vm_minor_version()               { assert(_initialized, "not initialized"); return _vm_minor_version; }

   static int vm_build_number()                { assert(_initialized, "not initialized"); return _vm_build_number; }

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

   static unsigned int jvm_version();

   // Internal version providing additional build information

   static const char* internal_vm_info_string();

   static const char* jre_release_version();

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

   static bool supports_cx8()  {

 #ifdef SUPPORTS_NATIVE_CX8

     return true;

 #else

     return _supports_cx8;

 #endif

   }

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

   // to guide intrinsification decisions for Unsafe atomic ops

   static bool supports_atomic_getset4()  {return _supports_atomic_getset4;}

   static bool supports_atomic_getset8()  {return _supports_atomic_getset8;}

   static bool supports_atomic_getadd4()  {return _supports_atomic_getadd4;}

   static bool supports_atomic_getadd8()  {return _supports_atomic_getadd8;}

   static unsigned int logical_processors_per_package() {

     return _logical_processors_per_package;

   }

   // Need a space at the end of TLAB for prefetch instructions

   // which may fault when accessing memory outside of heap.

   static int reserve_for_allocation_prefetch() {

     return _reserve_for_allocation_prefetch;

   }

   // ARCH specific policy for the BiasedLocking

   static bool use_biased_locking()  { return true; }

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

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

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

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

   static uint page_size_count() { return 2; }

   // Returns the number of parallel threads to be used for VM

   // work.  If that number has not been calculated, do so and

   // save it.  Returns ParallelGCThreads if it is set on the

   // command line.

   static unsigned int parallel_worker_threads();

   // Calculates and returns the number of parallel threads.  May

   // be VM version specific.

   static unsigned int calc_parallel_worker_threads();

 };

 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP