1 /*
   2  * Copyright (c) 1997, 2015, 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_VM_RUNTIME_VM_VERSION_HPP
  26 #define SHARE_VM_RUNTIME_VM_VERSION_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "utilities/ostream.hpp"
  30 
  31 // VM_Version provides information about the VM.
  32 
  33 class Abstract_VM_Version: AllStatic {
  34  protected:
  35   friend class VMStructs;
  36   static const char*  _s_vm_release;
  37   static const char*  _s_internal_vm_info_string;
  38   // These are set by machine-dependent initializations
  39   static bool         _supports_cx8;
  40   static bool         _supports_atomic_getset4;
  41   static bool         _supports_atomic_getset8;
  42   static bool         _supports_atomic_getadd4;
  43   static bool         _supports_atomic_getadd8;
  44   static unsigned int _logical_processors_per_package;
  45   static unsigned int _L1_data_cache_line_size;
  46   static int          _vm_major_version;
  47   static int          _vm_minor_version;
  48   static int          _vm_micro_version;
  49   static int          _vm_build_number;
  50   static bool         _initialized;
  51   static unsigned int _parallel_worker_threads;
  52   static bool         _parallel_worker_threads_initialized;
  53   static int          _reserve_for_allocation_prefetch;
  54 
  55   static unsigned int nof_parallel_worker_threads(unsigned int num,
  56                                                   unsigned int dem,
  57                                                   unsigned int switch_pt);
  58  public:
  59   static void initialize();
  60 
  61   // This allows for early initialization of VM_Version information
  62   // that may be needed later in the initialization sequence but before
  63   // full VM_Version initialization is possible. It can not depend on any
  64   // other part of the VM being initialized when called. Platforms that
  65   // need to specialize this define VM_Version::early_initialize().
  66   static void early_initialize() { }
  67   // Called to initialize VM variables needing initialization
  68   // after command line parsing
  69   static void vm_init_before_ergo(void) {}
  70 
  71   // Name
  72   static const char* vm_name();
  73   // Vendor
  74   static const char* vm_vendor();
  75   // VM version information string printed by launcher (java -version)
  76   static const char* vm_info_string();
  77   static const char* vm_release();
  78   static const char* vm_platform_string();
  79   static const char* vm_build_user();
  80 
  81   static int vm_major_version()               { assert(_initialized, "not initialized"); return _vm_major_version; }
  82   static int vm_minor_version()               { assert(_initialized, "not initialized"); return _vm_minor_version; }
  83   static int vm_micro_version()               { assert(_initialized, "not initialized"); return _vm_micro_version; }
  84   static int vm_build_number()                { assert(_initialized, "not initialized"); return _vm_build_number; }
  85 
  86   // Gets the jvm_version_info.jvm_version defined in jvm.h
  87   static unsigned int jvm_version();
  88 
  89   // Internal version providing additional build information
  90   static const char* internal_vm_info_string();
  91   static const char* jre_release_version();
  92 
  93   // does HW support an 8-byte compare-exchange operation?
  94   static bool supports_cx8()  {
  95 #ifdef SUPPORTS_NATIVE_CX8
  96     return true;
  97 #else
  98     return _supports_cx8;
  99 #endif
 100   }
 101   // does HW support atomic get-and-set or atomic get-and-add?  Used
 102   // to guide intrinsification decisions for Unsafe atomic ops
 103   static bool supports_atomic_getset4()  {return _supports_atomic_getset4;}
 104   static bool supports_atomic_getset8()  {return _supports_atomic_getset8;}
 105   static bool supports_atomic_getadd4()  {return _supports_atomic_getadd4;}
 106   static bool supports_atomic_getadd8()  {return _supports_atomic_getadd8;}
 107 
 108   static unsigned int logical_processors_per_package() {
 109     return _logical_processors_per_package;
 110   }
 111 
 112   static unsigned int L1_data_cache_line_size() {
 113     return _L1_data_cache_line_size;
 114   }
 115 
 116   // Need a space at the end of TLAB for prefetch instructions
 117   // which may fault when accessing memory outside of heap.
 118   static int reserve_for_allocation_prefetch() {
 119     return _reserve_for_allocation_prefetch;
 120   }
 121 
 122   // ARCH specific policy for the BiasedLocking
 123   static bool use_biased_locking()  { return true; }
 124 
 125   // Number of page sizes efficiently supported by the hardware.  Most chips now
 126   // support two sizes, thus this default implementation.  Processor-specific
 127   // subclasses should define new versions to hide this one as needed.  Note
 128   // that the O/S may support more sizes, but at most this many are used.
 129   static uint page_size_count() { return 2; }
 130 
 131   // Returns the number of parallel threads to be used for VM
 132   // work.  If that number has not been calculated, do so and
 133   // save it.  Returns ParallelGCThreads if it is set on the
 134   // command line.
 135   static unsigned int parallel_worker_threads();
 136   // Calculates and returns the number of parallel threads.  May
 137   // be VM version specific.
 138   static unsigned int calc_parallel_worker_threads();
 139 };
 140 
 141 #ifdef TARGET_ARCH_x86
 142 # include "vm_version_x86.hpp"
 143 #endif
 144 #ifdef TARGET_ARCH_sparc
 145 # include "vm_version_sparc.hpp"
 146 #endif
 147 #ifdef TARGET_ARCH_zero
 148 # include "vm_version_zero.hpp"
 149 #endif
 150 #ifdef TARGET_ARCH_arm
 151 # include "vm_version_arm.hpp"
 152 #endif
 153 #ifdef TARGET_ARCH_ppc
 154 # include "vm_version_ppc.hpp"
 155 #endif
 156 
 157 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP