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_security_version; 49 static int _vm_patch_version; 50 static int _vm_build_number; 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 // Called as part of the runtime services initialization which is 60 // called from the management module initialization (via init_globals()) 61 // after argument parsing and attaching of the main thread has 62 // occurred. Examines a variety of the hardware capabilities of 63 // the platform to determine which features can be used to execute the 64 // program. 65 static void initialize(); 66 67 // This allows for early initialization of VM_Version information 68 // that may be needed later in the initialization sequence but before 69 // full VM_Version initialization is possible. It can not depend on any 70 // other part of the VM being initialized when called. Platforms that 71 // need to specialize this define VM_Version::early_initialize(). 72 static void early_initialize() { } 73 74 // Called to initialize VM variables needing initialization 75 // after command line parsing. Platforms that need to specialize 76 // this should define VM_Version::init_before_ergo(). 77 static void init_before_ergo() {} 78 79 // Name 80 static const char* vm_name(); 81 // Vendor 82 static const char* vm_vendor(); 83 // VM version information string printed by launcher (java -version) 84 static const char* vm_info_string(); 85 static const char* vm_release(); 86 static const char* vm_platform_string(); 87 static const char* vm_build_user(); 88 89 static int vm_major_version() { return _vm_major_version; } 90 static int vm_minor_version() { return _vm_minor_version; } 91 static int vm_security_version() { return _vm_security_version; } 92 static int vm_patch_version() { return _vm_patch_version; } 93 static int vm_build_number() { return _vm_build_number; } 94 95 // Gets the jvm_version_info.jvm_version defined in jvm.h 96 static unsigned int jvm_version(); 97 98 // Internal version providing additional build information 99 static const char* internal_vm_info_string(); 100 static const char* jre_release_version(); 101 static const char* jdk_debug_level(); 102 103 // does HW support an 8-byte compare-exchange operation? 104 static bool supports_cx8() { 105 #ifdef SUPPORTS_NATIVE_CX8 106 return true; 107 #else 108 return _supports_cx8; 109 #endif 110 } 111 // does HW support atomic get-and-set or atomic get-and-add? Used 112 // to guide intrinsification decisions for Unsafe atomic ops 113 static bool supports_atomic_getset4() {return _supports_atomic_getset4;} 114 static bool supports_atomic_getset8() {return _supports_atomic_getset8;} 115 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;} 116 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;} 117 118 static unsigned int logical_processors_per_package() { 119 return _logical_processors_per_package; 120 } 121 122 static unsigned int L1_data_cache_line_size() { 123 return _L1_data_cache_line_size; 124 } 125 126 // Need a space at the end of TLAB for prefetch instructions 127 // which may fault when accessing memory outside of heap. 128 static int reserve_for_allocation_prefetch() { 129 return _reserve_for_allocation_prefetch; 130 } 131 132 // ARCH specific policy for the BiasedLocking 133 static bool use_biased_locking() { return true; } 134 135 // Number of page sizes efficiently supported by the hardware. Most chips now 136 // support two sizes, thus this default implementation. Processor-specific 137 // subclasses should define new versions to hide this one as needed. Note 138 // that the O/S may support more sizes, but at most this many are used. 139 static uint page_size_count() { return 2; } 140 141 // Returns the number of parallel threads to be used for VM 142 // work. If that number has not been calculated, do so and 143 // save it. Returns ParallelGCThreads if it is set on the 144 // command line. 145 static unsigned int parallel_worker_threads(); 146 // Calculates and returns the number of parallel threads. May 147 // be VM version specific. 148 static unsigned int calc_parallel_worker_threads(); 149 }; 150 151 #ifdef TARGET_ARCH_x86 152 # include "vm_version_x86.hpp" 153 #endif 154 #ifdef TARGET_ARCH_sparc 155 # include "vm_version_sparc.hpp" 156 #endif 157 #ifdef TARGET_ARCH_zero 158 # include "vm_version_zero.hpp" 159 #endif 160 #ifdef TARGET_ARCH_arm 161 # include "vm_version_arm.hpp" 162 #endif 163 #ifdef TARGET_ARCH_ppc 164 # include "vm_version_ppc.hpp" 165 #endif 166 167 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP