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_JAVA_HPP 26 #define SHARE_VM_RUNTIME_JAVA_HPP 27 28 #include "runtime/os.hpp" 29 30 // Execute code before all handles are released and thread is killed; prologue to vm_exit 31 extern void before_exit(JavaThread * thread); 32 33 // Forced VM exit (i.e, internal error or JVM_Exit) 34 extern void vm_exit(int code); 35 36 // Wrapper for ::exit() 37 extern void vm_direct_exit(int code); 38 39 // Shutdown the VM but do not exit the process 40 extern void vm_shutdown(); 41 // Shutdown the VM and abort the process 42 extern void vm_abort(bool dump_core=true); 43 44 // Trigger any necessary notification of the VM being shutdown 45 extern void notify_vm_shutdown(); 46 47 // VM exit if error occurs during initialization of VM 48 extern void vm_exit_during_initialization(Handle exception); 49 extern void vm_exit_during_initialization(Symbol* exception_name, const char* message); 50 extern void vm_exit_during_initialization(const char* error, const char* message = NULL); 51 extern void vm_shutdown_during_initialization(const char* error, const char* message = NULL); 52 53 /** 54 * Discovering the JDK_Version during initialization is tricky when the 55 * running JDK is less than JDK6. For JDK6 and greater, a "GetVersion" 56 * function exists in libjava.so and we simply call it during the 57 * 'initialize()' call to find the version. For JDKs with version < 6, no 58 * such call exists and we have to probe the JDK in order to determine 59 * the exact version. This probing cannot happen during late in 60 * the VM initialization process so there's a period of time during 61 * initialization when we don't know anything about the JDK version other than 62 * that it less than version 6. This is the "partially initialized" time, 63 * when we can answer only certain version queries (such as, is the JDK 64 * version greater than 5? Answer: no). Once the JDK probing occurs, we 65 * know the version and are considered fully initialized. 66 */ 67 class JDK_Version VALUE_OBJ_CLASS_SPEC { 68 friend class VMStructs; 69 friend class Universe; 70 friend void JDK_Version_init(); 71 private: 72 73 static JDK_Version _current; 74 static const char* _runtime_name; 75 static const char* _runtime_version; 76 77 // In this class, we promote the minor version of release to be the 78 // major version for releases >= 5 in anticipation of the JDK doing the 79 // same thing. For example, we represent "1.5.0" as major version 5 (we 80 // drop the leading 1 and use 5 as the 'major'). 81 82 uint8_t _major; 83 uint8_t _minor; 84 uint8_t _security; 85 uint8_t _patch; 86 uint8_t _build; 87 88 // If partially initialized, the above fields are invalid and we know 89 // that we're less than major version 6. 90 bool _partially_initialized; 91 92 bool _thread_park_blocker; 93 bool _post_vm_init_hook_enabled; 94 95 bool is_valid() const { 96 return (_major != 0 || _partially_initialized); 97 } 98 99 // initializes or partially initializes the _current static field 100 static void initialize(); 101 102 public: 103 104 // Returns true if the the current version has only been partially initialized 105 static bool is_partially_initialized() { 106 return _current._partially_initialized; 107 } 108 109 JDK_Version() : _major(0), _minor(0), _security(0), _patch(0), _build(0), 110 _partially_initialized(false), 111 _thread_park_blocker(false), _post_vm_init_hook_enabled(false) 112 {} 113 114 JDK_Version(uint8_t major, uint8_t minor = 0, uint8_t security = 0, 115 uint8_t patch = 0, uint8_t build = 0, 116 bool thread_park_blocker = false, bool post_vm_init_hook_enabled = false) : 117 _major(major), _minor(minor), _security(security), _patch(patch), 118 _build(build), _partially_initialized(false), 119 _thread_park_blocker(thread_park_blocker), 120 _post_vm_init_hook_enabled(post_vm_init_hook_enabled) 121 {} 122 123 // Returns the current running JDK version 124 static JDK_Version current() { return _current; } 125 126 // Factory methods for convenience 127 static JDK_Version jdk(uint8_t m) { 128 return JDK_Version(m); 129 } 130 131 uint8_t major_version() const { return _major; } 132 uint8_t minor_version() const { return _minor; } 133 uint8_t security_version() const { return _security; } 134 uint8_t patch_version() const { return _patch; } 135 uint8_t build_number() const { return _build; } 136 137 bool supports_thread_park_blocker() const { 138 return _thread_park_blocker; 139 } 140 bool post_vm_init_hook_enabled() const { 141 return _post_vm_init_hook_enabled; 142 } 143 144 // Performs a full ordering comparison using all fields (patch, build, etc.) 145 int compare(const JDK_Version& other) const; 146 147 /** 148 * Performs comparison using only the major version, returning negative 149 * if the major version of 'this' is less than the parameter, 0 if it is 150 * equal, and a positive value if it is greater. 151 */ 152 int compare_major(int version) const { 153 if (_partially_initialized) { 154 if (version >= 6) { 155 return -1; 156 } else { 157 assert(false, "Can't make this comparison during init time"); 158 return -1; // conservative 159 } 160 } else { 161 return major_version() - version; 162 } 163 } 164 165 void to_string(char* buffer, size_t buflen) const; 166 167 static const char* runtime_name() { 168 return _runtime_name; 169 } 170 static void set_runtime_name(const char* name) { 171 _runtime_name = name; 172 } 173 174 static const char* runtime_version() { 175 return _runtime_version; 176 } 177 static void set_runtime_version(const char* version) { 178 _runtime_version = version; 179 } 180 181 }; 182 183 #endif // SHARE_VM_RUNTIME_JAVA_HPP