1 /* 2 * Copyright (c) 1997, 2011, 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 unsigned int _logical_processors_per_package; 41 static int _vm_major_version; 42 static int _vm_minor_version; 43 static int _vm_build_number; 44 static bool _initialized; 45 static int _parallel_worker_threads; 46 static bool _parallel_worker_threads_initialized; 47 static int _reserve_for_allocation_prefetch; 48 49 static unsigned int nof_parallel_worker_threads(unsigned int num, 50 unsigned int dem, 51 unsigned int switch_pt); 52 public: 53 static void initialize(); 54 55 // Name 56 static const char* vm_name(); 57 // Vendor 58 static const char* vm_vendor(); 59 // VM version information string printed by launcher (java -version) 60 static const char* vm_info_string(); 61 static const char* vm_release(); 62 static const char* vm_platform_string(); 63 static const char* vm_build_user(); 64 65 static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; } 66 static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; } 67 static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; } 68 69 // Gets the jvm_version_info.jvm_version defined in jvm.h 70 static unsigned int jvm_version(); 71 72 // Internal version providing additional build information 73 static const char* internal_vm_info_string(); 74 static const char* jre_release_version(); 75 76 // does HW support an 8-byte compare-exchange operation? 77 static bool supports_cx8() {return _supports_cx8;} 78 static unsigned int logical_processors_per_package() { 79 return _logical_processors_per_package; 80 } 81 82 // Need a space at the end of TLAB for prefetch instructions 83 // which may fault when accessing memory outside of heap. 84 static int reserve_for_allocation_prefetch() { 85 return _reserve_for_allocation_prefetch; 86 } 87 88 // ARCH specific policy for the BiasedLocking 89 static bool use_biased_locking() { return true; } 90 91 // Number of page sizes efficiently supported by the hardware. Most chips now 92 // support two sizes, thus this default implementation. Processor-specific 93 // subclasses should define new versions to hide this one as needed. Note 94 // that the O/S may support more sizes, but at most this many are used. 95 static uint page_size_count() { return 2; } 96 97 // Returns the number of parallel threads to be used for VM 98 // work. If that number has not been calculated, do so and 99 // save it. Returns ParallelGCThreads if it is set on the 100 // command line. 101 static unsigned int parallel_worker_threads(); 102 // Calculates and returns the number of parallel threads. May 103 // be VM version specific. 104 static unsigned int calc_parallel_worker_threads(); 105 }; 106 107 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP