1 /*
2 * Copyright (c) 1997, 2008, 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 // Register function to be called by before_exit
26 extern "C" { void register_on_exit_function(void (*func)(void)) ;}
27
28 // Execute code before all handles are released and thread is killed; prologue to vm_exit
29 extern void before_exit(JavaThread * thread);
30
31 // Forced VM exit (i.e, internal error or JVM_Exit)
32 extern void vm_exit(int code);
33
34 // Wrapper for ::exit()
35 extern void vm_direct_exit(int code);
36
37 // Shutdown the VM but do not exit the process
38 extern void vm_shutdown();
39 // Shutdown the VM and abort the process
40 extern void vm_abort(bool dump_core=true);
41
42 // Trigger any necessary notification of the VM being shutdown
43 extern void notify_vm_shutdown();
44
45 // VM exit if error occurs during initialization of VM
46 extern void vm_exit_during_initialization(Handle exception);
47 extern void vm_exit_during_initialization(symbolHandle exception_name, const char* message);
48 extern void vm_exit_during_initialization(const char* error, const char* message = NULL);
49 extern void vm_shutdown_during_initialization(const char* error, const char* message = NULL);
50
51 /**
52 * Discovering the JDK_Version during initialization is tricky when the
53 * running JDK is less than JDK6. For JDK6 and greater, a "GetVersion"
54 * function exists in libjava.so and we simply call it during the
55 * 'initialize()' call to find the version. For JDKs with version < 6, no
56 * such call exists and we have to probe the JDK in order to determine
57 * the exact version. This probing cannot happen during late in
58 * the VM initialization process so there's a period of time during
59 * initialization when we don't know anything about the JDK version other than
60 * that it less than version 6. This is the "partially initialized" time,
61 * when we can answer only certain version queries (such as, is the JDK
62 * version greater than 5? Answer: no). Once the JDK probing occurs, we
63 * know the version and are considered fully initialized.
64 */
65 class JDK_Version VALUE_OBJ_CLASS_SPEC {
66 friend class VMStructs;
67 friend class Universe;
68 friend void JDK_Version_init();
69 private:
70
71 static JDK_Version _current;
72
73 // In this class, we promote the minor version of release to be the
74 // major version for releases >= 5 in anticipation of the JDK doing the
75 // same thing. For example, we represent "1.5.0" as major version 5 (we
76 // drop the leading 1 and use 5 as the 'major').
77
78 uint8_t _major;
79 uint8_t _minor;
80 uint8_t _micro;
81 uint8_t _update;
82 uint8_t _special;
83 uint8_t _build;
84
85 // If partially initialized, the above fields are invalid and we know
86 // that we're less than major version 6.
87 bool _partially_initialized;
88
89 bool _thread_park_blocker;
90
91 bool is_valid() const {
92 return (_major != 0 || _partially_initialized);
93 }
94
95 // initializes or partially initializes the _current static field
96 static void initialize();
97
98 // Completes initialization for a pre-JDK6 version.
99 static void fully_initialize(uint8_t major, uint8_t minor = 0,
100 uint8_t micro = 0, uint8_t update = 0);
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), _micro(0), _update(0),
110 _special(0), _build(0), _partially_initialized(false),
111 _thread_park_blocker(false) {}
112
113 JDK_Version(uint8_t major, uint8_t minor = 0, uint8_t micro = 0,
114 uint8_t update = 0, uint8_t special = 0, uint8_t build = 0,
115 bool thread_park_blocker = false) :
116 _major(major), _minor(minor), _micro(micro), _update(update),
117 _special(special), _build(build), _partially_initialized(false),
118 _thread_park_blocker(thread_park_blocker) {}
119
120 // Returns the current running JDK version
121 static JDK_Version current() { return _current; }
122
123 // Factory methods for convenience
124 static JDK_Version jdk(uint8_t m) {
125 return JDK_Version(m);
126 }
127
128 static JDK_Version jdk_update(uint8_t major, uint8_t update_number) {
129 return JDK_Version(major, 0, 0, update_number);
130 }
131
132 uint8_t major_version() const { return _major; }
133 uint8_t minor_version() const { return _minor; }
134 uint8_t micro_version() const { return _micro; }
135 uint8_t update_version() const { return _update; }
136 uint8_t special_update_version() const { return _special; }
137 uint8_t build_number() const { return _build; }
138
139 bool supports_thread_park_blocker() const {
140 return _thread_park_blocker;
141 }
142
143 // Performs a full ordering comparison using all fields (update, build, etc.)
144 int compare(const JDK_Version& other) const;
145
146 /**
147 * Performs comparison using only the major version, returning negative
148 * if the major version of 'this' is less than the parameter, 0 if it is
149 * equal, and a positive value if it is greater.
150 */
151 int compare_major(int version) const {
152 if (_partially_initialized) {
153 if (version >= 6) {
154 return -1;
155 } else {
156 assert(false, "Can't make this comparison during init time");
157 return -1; // conservative
158 }
159 } else {
160 return major_version() - version;
161 }
162 }
163
164 void to_string(char* buffer, size_t buflen) const;
165
166 // Convenience methods for queries on the current major/minor version
167 static bool is_jdk12x_version() {
168 return current().compare_major(2) == 0;
169 }
170
171 static bool is_jdk13x_version() {
172 return current().compare_major(3) == 0;
173 }
174
175 static bool is_jdk14x_version() {
176 return current().compare_major(4) == 0;
177 }
178
179 static bool is_jdk15x_version() {
180 return current().compare_major(5) == 0;
181 }
182
183 static bool is_jdk16x_version() {
184 return current().compare_major(6) == 0;
185 }
186
187 static bool is_jdk17x_version() {
188 return current().compare_major(7) == 0;
189 }
190
191 static bool is_gte_jdk13x_version() {
192 return current().compare_major(3) >= 0;
193 }
194
195 static bool is_gte_jdk14x_version() {
196 return current().compare_major(4) >= 0;
197 }
198
199 static bool is_gte_jdk15x_version() {
200 return current().compare_major(5) >= 0;
201 }
202
203 static bool is_gte_jdk16x_version() {
204 return current().compare_major(6) >= 0;
205 }
206
207 static bool is_gte_jdk17x_version() {
208 return current().compare_major(7) >= 0;
209 }
210 };