1 /* 2 * Copyright (c) 1997, 2020, 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_RUNTIME_ABSTRACT_VM_VERSION_HPP 26 #define SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP 27 28 #include "memory/allocation.hpp" // For declaration of class AllStatic 29 #include "utilities/globalDefinitions.hpp" 30 31 typedef enum { 32 NoDetectedVirtualization, 33 XenHVM, 34 KVM, 35 VMWare, 36 HyperV, 37 HyperVRole, 38 PowerVM, // on AIX or Linux ppc64(le) 39 PowerFullPartitionMode, // on Linux ppc64(le) 40 PowerKVM 41 } VirtualizationType; 42 43 class outputStream; 44 45 // Abstract_VM_Version provides information about the VM. 46 47 class Abstract_VM_Version: AllStatic { 48 friend class VMStructs; 49 friend class JVMCIVMStructs; 50 51 protected: 52 static const char* _s_vm_release; 53 static const char* _s_internal_vm_info_string; 54 55 // CPU feature flags. 56 static uint64_t _features; 57 static const char* _features_string; 58 59 // These are set by machine-dependent initializations 60 static bool _supports_cx8; 61 static bool _supports_atomic_getset4; 62 static bool _supports_atomic_getset8; 63 static bool _supports_atomic_getadd4; 64 static bool _supports_atomic_getadd8; 65 static unsigned int _logical_processors_per_package; 66 static unsigned int _L1_data_cache_line_size; 67 static int _vm_major_version; 68 static int _vm_minor_version; 69 static int _vm_security_version; 70 static int _vm_patch_version; 71 static int _vm_build_number; 72 static unsigned int _data_cache_line_flush_size; 73 74 static VirtualizationType _detected_virtualization; 75 76 public: 77 // Called as part of the runtime services initialization which is 78 // called from the management module initialization (via init_globals()) 79 // after argument parsing and attaching of the main thread has 80 // occurred. Examines a variety of the hardware capabilities of 81 // the platform to determine which features can be used to execute the 82 // program. initialize()83 static void initialize() { } 84 85 // This allows for early initialization of VM_Version information 86 // that may be needed later in the initialization sequence but before 87 // full VM_Version initialization is possible. It can not depend on any 88 // other part of the VM being initialized when called. Platforms that 89 // need to specialize this define VM_Version::early_initialize(). early_initialize()90 static void early_initialize() { } 91 92 // Called to initialize VM variables needing initialization 93 // after command line parsing. Platforms that need to specialize 94 // this should define VM_Version::init_before_ergo(). init_before_ergo()95 static void init_before_ergo() {} 96 97 // Name 98 static const char* vm_name(); 99 // Vendor 100 static const char* vm_vendor(); 101 // VM version information string printed by launcher (java -version) 102 static const char* vm_info_string(); 103 static const char* vm_release(); 104 static const char* vm_platform_string(); 105 static const char* vm_build_user(); 106 vm_major_version()107 static int vm_major_version() { return _vm_major_version; } vm_minor_version()108 static int vm_minor_version() { return _vm_minor_version; } vm_security_version()109 static int vm_security_version() { return _vm_security_version; } vm_patch_version()110 static int vm_patch_version() { return _vm_patch_version; } vm_build_number()111 static int vm_build_number() { return _vm_build_number; } 112 113 // Gets the jvm_version_info.jvm_version 114 static unsigned int jvm_version(); 115 116 // Internal version providing additional build information 117 static const char* internal_vm_info_string(); 118 static const char* jre_release_version(); 119 static const char* jdk_debug_level(); 120 static const char* printable_jdk_debug_level(); 121 features()122 static uint64_t features() { return _features; } features_string()123 static const char* features_string() { return _features_string; } 124 static void insert_features_names(char* buf, size_t buflen, const char* features_names[]); 125 get_detected_virtualization()126 static VirtualizationType get_detected_virtualization() { 127 return _detected_virtualization; 128 } 129 130 // platforms that need to specialize this 131 // define VM_Version::print_platform_virtualization_info() print_platform_virtualization_info(outputStream *)132 static void print_platform_virtualization_info(outputStream*) { } 133 134 // does HW support an 8-byte compare-exchange operation? supports_cx8()135 static bool supports_cx8() { 136 #ifdef SUPPORTS_NATIVE_CX8 137 return true; 138 #else 139 return _supports_cx8; 140 #endif 141 } 142 // does HW support atomic get-and-set or atomic get-and-add? Used 143 // to guide intrinsification decisions for Unsafe atomic ops supports_atomic_getset4()144 static bool supports_atomic_getset4() {return _supports_atomic_getset4;} supports_atomic_getset8()145 static bool supports_atomic_getset8() {return _supports_atomic_getset8;} supports_atomic_getadd4()146 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;} supports_atomic_getadd8()147 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;} 148 logical_processors_per_package()149 static unsigned int logical_processors_per_package() { 150 return _logical_processors_per_package; 151 } 152 L1_data_cache_line_size()153 static unsigned int L1_data_cache_line_size() { 154 return _L1_data_cache_line_size; 155 } 156 157 // the size in bytes of a data cache line flushed by a flush 158 // operation which should be a power of two or zero if cache line 159 // writeback is not supported by the current os_cpu combination data_cache_line_flush_size()160 static unsigned int data_cache_line_flush_size() { 161 return _data_cache_line_flush_size; 162 } 163 164 // returns true if and only if cache line writeback is supported supports_data_cache_line_flush()165 static bool supports_data_cache_line_flush() { 166 return _data_cache_line_flush_size != 0; 167 } 168 169 // ARCH specific policy for the BiasedLocking use_biased_locking()170 static bool use_biased_locking() { return true; } 171 172 // Number of page sizes efficiently supported by the hardware. Most chips now 173 // support two sizes, thus this default implementation. Processor-specific 174 // subclasses should define new versions to hide this one as needed. Note 175 // that the O/S may support more sizes, but at most this many are used. page_size_count()176 static uint page_size_count() { return 2; } 177 178 // Denominator for computing default ParallelGCThreads for machines with 179 // a large number of cores. parallel_worker_threads_denominator()180 static uint parallel_worker_threads_denominator() { return 8; } 181 182 // Does this CPU support spin wait instruction? supports_on_spin_wait()183 static bool supports_on_spin_wait() { return false; } 184 185 // Does platform support fast class initialization checks for static methods? supports_fast_class_init_checks()186 static bool supports_fast_class_init_checks() { return false; } 187 188 // Does platform support stack watermark barriers for concurrent stack processing? supports_stack_watermark_barrier()189 constexpr static bool supports_stack_watermark_barrier() { return false; } 190 191 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]); 192 }; 193 194 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP 195