vm_version.hpp revision 6760:22b98ab2a69f
1/* 2 * Copyright (c) 1997, 2014, 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 33class 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 int _vm_major_version; 46 static int _vm_minor_version; 47 static int _vm_micro_version; 48 static int _vm_build_number; 49 static bool _initialized; 50 static int _parallel_worker_threads; 51 static bool _parallel_worker_threads_initialized; 52 static int _reserve_for_allocation_prefetch; 53 54 static unsigned int nof_parallel_worker_threads(unsigned int num, 55 unsigned int dem, 56 unsigned int switch_pt); 57 public: 58 static void initialize(); 59 60 // Name 61 static const char* vm_name(); 62 // Vendor 63 static const char* vm_vendor(); 64 // VM version information string printed by launcher (java -version) 65 static const char* vm_info_string(); 66 static const char* vm_release(); 67 static const char* vm_platform_string(); 68 static const char* vm_build_user(); 69 70 static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; } 71 static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; } 72 static int vm_micro_version() { assert(_initialized, "not initialized"); return _vm_micro_version; } 73 static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; } 74 75 // Gets the jvm_version_info.jvm_version defined in jvm.h 76 static unsigned int jvm_version(); 77 78 // Internal version providing additional build information 79 static const char* internal_vm_info_string(); 80 static const char* jre_release_version(); 81 82 // does HW support an 8-byte compare-exchange operation? 83 static bool supports_cx8() { 84#ifdef SUPPORTS_NATIVE_CX8 85 return true; 86#else 87 return _supports_cx8; 88#endif 89 } 90 // does HW support atomic get-and-set or atomic get-and-add? Used 91 // to guide intrinsification decisions for Unsafe atomic ops 92 static bool supports_atomic_getset4() {return _supports_atomic_getset4;} 93 static bool supports_atomic_getset8() {return _supports_atomic_getset8;} 94 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;} 95 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;} 96 97 static unsigned int logical_processors_per_package() { 98 return _logical_processors_per_package; 99 } 100 101 // Need a space at the end of TLAB for prefetch instructions 102 // which may fault when accessing memory outside of heap. 103 static int reserve_for_allocation_prefetch() { 104 return _reserve_for_allocation_prefetch; 105 } 106 107 // ARCH specific policy for the BiasedLocking 108 static bool use_biased_locking() { return true; } 109 110 // Number of page sizes efficiently supported by the hardware. Most chips now 111 // support two sizes, thus this default implementation. Processor-specific 112 // subclasses should define new versions to hide this one as needed. Note 113 // that the O/S may support more sizes, but at most this many are used. 114 static uint page_size_count() { return 2; } 115 116 // Returns the number of parallel threads to be used for VM 117 // work. If that number has not been calculated, do so and 118 // save it. Returns ParallelGCThreads if it is set on the 119 // command line. 120 static unsigned int parallel_worker_threads(); 121 // Calculates and returns the number of parallel threads. May 122 // be VM version specific. 123 static unsigned int calc_parallel_worker_threads(); 124}; 125 126#ifdef TARGET_ARCH_x86 127# include "vm_version_x86.hpp" 128#endif 129#ifdef TARGET_ARCH_sparc 130# include "vm_version_sparc.hpp" 131#endif 132#ifdef TARGET_ARCH_zero 133# include "vm_version_zero.hpp" 134#endif 135#ifdef TARGET_ARCH_arm 136# include "vm_version_arm.hpp" 137#endif 138#ifdef TARGET_ARCH_ppc 139# include "vm_version_ppc.hpp" 140#endif 141 142#endif // SHARE_VM_RUNTIME_VM_VERSION_HPP 143