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 _micro;
85 uint8_t _update;
86 uint8_t _special;
87 uint8_t _build;
88
89 // If partially initialized, the above fields are invalid and we know
90 // that we're less than major version 6.
91 bool _partially_initialized;
92
93 bool _thread_park_blocker;
94 bool _post_vm_init_hook_enabled;
95
96 bool is_valid() const {
97 return (_major != 0 || _partially_initialized);
98 }
99
100 // initializes or partially initializes the _current static field
101 static void initialize();
102
103 // Completes initialization for a pre-JDK6 version.
104 static void fully_initialize(uint8_t major, uint8_t minor = 0,
105 uint8_t micro = 0, uint8_t update = 0);
106
107 public:
108
109 // Returns true if the the current version has only been partially initialized
110 static bool is_partially_initialized() {
111 return _current._partially_initialized;
112 }
113
114 JDK_Version() : _major(0), _minor(0), _micro(0), _update(0),
115 _special(0), _build(0), _partially_initialized(false),
116 _thread_park_blocker(false), _post_vm_init_hook_enabled(false)
117 {}
118
119 JDK_Version(uint8_t major, uint8_t minor = 0, uint8_t micro = 0,
120 uint8_t update = 0, uint8_t special = 0, uint8_t build = 0,
121 bool thread_park_blocker = false, bool post_vm_init_hook_enabled = false) :
122 _major(major), _minor(minor), _micro(micro), _update(update),
123 _special(special), _build(build), _partially_initialized(false),
124 _thread_park_blocker(thread_park_blocker),
125 _post_vm_init_hook_enabled(post_vm_init_hook_enabled)
126 {}
127
128 // Returns the current running JDK version
129 static JDK_Version current() { return _current; }
130
131 // Factory methods for convenience
132 static JDK_Version jdk(uint8_t m) {
133 return JDK_Version(m);
134 }
135
136 static JDK_Version jdk_update(uint8_t major, uint8_t update_number) {
137 return JDK_Version(major, 0, 0, update_number);
138 }
139
140 uint8_t major_version() const { return _major; }
141 uint8_t minor_version() const { return _minor; }
142 uint8_t micro_version() const { return _micro; }
143 uint8_t update_version() const { return _update; }
144 uint8_t special_update_version() const { return _special; }
145 uint8_t build_number() const { return _build; }
146
147 bool supports_thread_park_blocker() const {
148 return _thread_park_blocker;
149 }
150 bool post_vm_init_hook_enabled() const {
151 return _post_vm_init_hook_enabled;
152 }
153
154 // Performs a full ordering comparison using all fields (update, build, etc.)
155 int compare(const JDK_Version& other) const;
156
157 /**
158 * Performs comparison using only the major version, returning negative
159 * if the major version of 'this' is less than the parameter, 0 if it is
160 * equal, and a positive value if it is greater.
161 */
162 int compare_major(int version) const {
163 if (_partially_initialized) {
164 if (version >= 6) {
165 return -1;
166 } else {
167 assert(false, "Can't make this comparison during init time");
168 return -1; // conservative
169 }
170 } else {
171 return major_version() - version;
172 }
173 }
174
175 void to_string(char* buffer, size_t buflen) const;
176
177 static const char* runtime_name() {
178 return _runtime_name;
179 }
180 static void set_runtime_name(const char* name) {
181 _runtime_name = name;
182 }
183
184 static const char* runtime_version() {
185 return _runtime_version;
186 }
187 static void set_runtime_version(const char* version) {
188 _runtime_version = version;
189 }
190
191 };
192
193 #endif // SHARE_VM_RUNTIME_JAVA_HPP