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_JAVA_HPP 26 #define SHARE_VM_RUNTIME_JAVA_HPP 27 28 #include "runtime/os.hpp" 29 30 // Register function to be called by before_exit 31 extern "C" { void register_on_exit_function(void (*func)(void)) ;} 32 33 // Execute code before all handles are released and thread is killed; prologue to vm_exit 34 extern void before_exit(JavaThread * thread); 35 36 // Forced VM exit (i.e, internal error or JVM_Exit) 37 extern void vm_exit(int code); 38 39 // Wrapper for ::exit() 40 extern void vm_direct_exit(int code); 41 42 // Shutdown the VM but do not exit the process 43 extern void vm_shutdown(); 44 // Shutdown the VM and abort the process 45 extern void vm_abort(bool dump_core=true); 46 47 // Trigger any necessary notification of the VM being shutdown 48 extern void notify_vm_shutdown(); 49 50 // VM exit if error occurs during initialization of VM 51 extern void vm_exit_during_initialization(Handle exception); 52 extern void vm_exit_during_initialization(Symbol* exception_name, const char* message); 53 extern void vm_exit_during_initialization(const char* error, const char* message = NULL); 54 extern void vm_shutdown_during_initialization(const char* error, const char* message = NULL); 55 56 /** 57 * Discovering the JDK_Version during initialization is tricky when the 58 * running JDK is less than JDK6. For JDK6 and greater, a "GetVersion" 59 * function exists in libjava.so and we simply call it during the 60 * 'initialize()' call to find the version. For JDKs with version < 6, no 61 * such call exists and we have to probe the JDK in order to determine 62 * the exact version. This probing cannot happen during late in 63 * the VM initialization process so there's a period of time during 64 * initialization when we don't know anything about the JDK version other than 65 * that it less than version 6. This is the "partially initialized" time, 66 * when we can answer only certain version queries (such as, is the JDK 67 * version greater than 5? Answer: no). Once the JDK probing occurs, we 68 * know the version and are considered fully initialized. 69 */ 70 class JDK_Version VALUE_OBJ_CLASS_SPEC { 71 friend class VMStructs; 72 friend class Universe; 73 friend void JDK_Version_init(); 74 private: 75 76 static JDK_Version _current; 77 78 // In this class, we promote the minor version of release to be the 79 // major version for releases >= 5 in anticipation of the JDK doing the 80 // same thing. For example, we represent "1.5.0" as major version 5 (we 81 // drop the leading 1 and use 5 as the 'major'). 82 83 uint8_t _major; 84 uint8_t _minor; 85 uint8_t _micro; 86 uint8_t _update; 87 uint8_t _special; 88 uint8_t _build; 89 90 // If partially initialized, the above fields are invalid and we know 91 // that we're less than major version 6. 92 bool _partially_initialized; 93 94 bool _thread_park_blocker; 95 bool _pending_list_uses_discovered_field; 96 bool _post_vm_init_hook_enabled; 97 98 bool is_valid() const { 99 return (_major != 0 || _partially_initialized); 100 } 101 102 // initializes or partially initializes the _current static field 103 static void initialize(); 104 105 // Completes initialization for a pre-JDK6 version. 106 static void fully_initialize(uint8_t major, uint8_t minor = 0, 107 uint8_t micro = 0, uint8_t update = 0); 108 109 public: 110 111 // Returns true if the the current version has only been partially initialized 112 static bool is_partially_initialized() { 113 return _current._partially_initialized; 114 } 115 116 JDK_Version() : _major(0), _minor(0), _micro(0), _update(0), 117 _special(0), _build(0), _partially_initialized(false), 118 _thread_park_blocker(false), _post_vm_init_hook_enabled(false), 119 _pending_list_uses_discovered_field(false) {} 120 121 JDK_Version(uint8_t major, uint8_t minor = 0, uint8_t micro = 0, 122 uint8_t update = 0, uint8_t special = 0, uint8_t build = 0, 123 bool thread_park_blocker = false, bool post_vm_init_hook_enabled = false, 124 bool pending_list_uses_discovered_field = false) : 125 _major(major), _minor(minor), _micro(micro), _update(update), 126 _special(special), _build(build), _partially_initialized(false), 127 _thread_park_blocker(thread_park_blocker), 128 _post_vm_init_hook_enabled(post_vm_init_hook_enabled), 129 _pending_list_uses_discovered_field(pending_list_uses_discovered_field) {} 130 131 // Returns the current running JDK version 132 static JDK_Version current() { return _current; } 133 134 // Factory methods for convenience 135 static JDK_Version jdk(uint8_t m) { 136 return JDK_Version(m); 137 } 138 139 static JDK_Version jdk_update(uint8_t major, uint8_t update_number) { 140 return JDK_Version(major, 0, 0, update_number); 141 } 142 143 uint8_t major_version() const { return _major; } 144 uint8_t minor_version() const { return _minor; } 145 uint8_t micro_version() const { return _micro; } 146 uint8_t update_version() const { return _update; } 147 uint8_t special_update_version() const { return _special; } 148 uint8_t build_number() const { return _build; } 149 150 bool supports_thread_park_blocker() const { 151 return _thread_park_blocker; 152 } 153 bool post_vm_init_hook_enabled() const { 154 return _post_vm_init_hook_enabled; 155 } 156 // For compatibility wrt pre-4965777 JDK's 157 bool pending_list_uses_discovered_field() const { 158 return _pending_list_uses_discovered_field; 159 } 160 161 // Performs a full ordering comparison using all fields (update, build, etc.) 162 int compare(const JDK_Version& other) const; 163 164 /** 165 * Performs comparison using only the major version, returning negative 166 * if the major version of 'this' is less than the parameter, 0 if it is 167 * equal, and a positive value if it is greater. 168 */ 169 int compare_major(int version) const { 170 if (_partially_initialized) { 171 if (version >= 6) { 172 return -1; 173 } else { 174 assert(false, "Can't make this comparison during init time"); 175 return -1; // conservative 176 } 177 } else { 178 return major_version() - version; 179 } 180 } 181 182 void to_string(char* buffer, size_t buflen) const; 183 184 // Convenience methods for queries on the current major/minor version 185 static bool is_jdk12x_version() { 186 return current().compare_major(2) == 0; 187 } 188 189 static bool is_jdk13x_version() { 190 return current().compare_major(3) == 0; 191 } 192 193 static bool is_jdk14x_version() { 194 return current().compare_major(4) == 0; 195 } 196 197 static bool is_jdk15x_version() { 198 return current().compare_major(5) == 0; 199 } 200 201 static bool is_jdk16x_version() { 202 return current().compare_major(6) == 0; 203 } 204 205 static bool is_jdk17x_version() { 206 return current().compare_major(7) == 0; 207 } 208 209 static bool is_gte_jdk13x_version() { 210 return current().compare_major(3) >= 0; 211 } 212 213 static bool is_gte_jdk14x_version() { 214 return current().compare_major(4) >= 0; 215 } 216 217 static bool is_gte_jdk15x_version() { 218 return current().compare_major(5) >= 0; 219 } 220 221 static bool is_gte_jdk16x_version() { 222 return current().compare_major(6) >= 0; 223 } 224 225 static bool is_gte_jdk17x_version() { 226 return current().compare_major(7) >= 0; 227 } 228 }; 229 230 #endif // SHARE_VM_RUNTIME_JAVA_HPP