1 /*
2 * Copyright (c) 1997, 2024, 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_VMOPERATIONS_HPP
26 #define SHARE_RUNTIME_VMOPERATIONS_HPP
27
28 #include "oops/oop.hpp"
29 #include "runtime/javaThread.hpp"
30 #include "runtime/vmOperation.hpp"
31 #include "runtime/threadSMR.hpp"
32
33 class ObjectMonitorsView;
34
35 // A hodge podge of commonly used VM Operations
36
37 class VM_EmptyOperation : public VM_Operation {
38 public:
39 virtual void doit() final {}
40 virtual bool skip_thread_oop_barriers() const final {
41 // Neither the doit function nor the safepoint
42 // cleanup tasks read oops in the Java threads.
43 return true;
44 }
45 };
46
47 class VM_Halt: public VM_EmptyOperation {
48 public:
49 VMOp_Type type() const { return VMOp_Halt; }
50 };
51
52 class VM_SafepointALot: public VM_EmptyOperation {
53 public:
54 VMOp_Type type() const { return VMOp_SafepointALot; }
55 };
56
57 // empty vm op, evaluated just to force a safepoint
58 class VM_ForceSafepoint: public VM_EmptyOperation {
59 public:
60 VMOp_Type type() const { return VMOp_ForceSafepoint; }
61 };
62
63 // used by whitebox API to emulate VM issues
64 // when VM can't operate and doesn't respond to jcmd
65 class VM_HangInSafepoint: public VM_Operation {
66 public:
67 VMOp_Type type() const { return VMOp_ForceSafepoint; }
68 void doit() {
69 while(true) {
70 os::naked_short_sleep(10);
71 }
72 }
73 };
74
75 class VM_ClearICs: public VM_Operation {
76 private:
77 bool _preserve_static_stubs;
78 public:
79 VM_ClearICs(bool preserve_static_stubs) { _preserve_static_stubs = preserve_static_stubs; }
80 void doit();
81 VMOp_Type type() const { return VMOp_ClearICs; }
82 };
83
84 // Base class for invoking parts of a gtest in a safepoint.
85 // Derived classes provide the doit method.
86 // Typically also need to transition the gtest thread from native to VM.
87 class VM_GTestExecuteAtSafepoint: public VM_Operation {
88 public:
89 VMOp_Type type() const { return VMOp_GTestExecuteAtSafepoint; }
90
91 protected:
92 VM_GTestExecuteAtSafepoint() {}
93 };
94
95 class VM_CleanClassLoaderDataMetaspaces : public VM_Operation {
96 public:
97 VM_CleanClassLoaderDataMetaspaces() {}
98 VMOp_Type type() const { return VMOp_CleanClassLoaderDataMetaspaces; }
99 void doit();
100 };
101
102 class VM_RehashStringTable : public VM_Operation {
103 public:
104 VM_RehashStringTable() {}
105 VMOp_Type type() const { return VMOp_RehashStringTable; }
106 void doit();
107 };
108
109 class VM_RehashSymbolTable : public VM_Operation {
110 public:
111 VM_RehashSymbolTable() {}
112 VMOp_Type type() const { return VMOp_RehashSymbolTable; }
113 void doit();
114 };
115
116 // Deopt helper that can deoptimize frames in threads other than the
117 // current thread. Only used through Deoptimization::deoptimize_frame.
118 class VM_DeoptimizeFrame: public VM_Operation {
119 friend class Deoptimization;
120
121 private:
122 JavaThread* _thread;
123 intptr_t* _id;
124 int _reason;
125 VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id, int reason);
126
127 public:
128 VMOp_Type type() const { return VMOp_DeoptimizeFrame; }
129 void doit();
130 bool allow_nested_vm_operations() const { return true; }
131 };
132
133 #ifndef PRODUCT
134 class VM_DeoptimizeAll: public VM_Operation {
135 public:
136 VM_DeoptimizeAll() {}
137 VMOp_Type type() const { return VMOp_DeoptimizeAll; }
138 void doit();
139 bool allow_nested_vm_operations() const { return true; }
140 };
141
142
143 class VM_ZombieAll: public VM_Operation {
144 public:
145 VM_ZombieAll() {}
146 VMOp_Type type() const { return VMOp_ZombieAll; }
147 void doit();
148 bool allow_nested_vm_operations() const { return true; }
149 };
150 #endif // PRODUCT
151
152 class VM_PrintThreads: public VM_Operation {
153 private:
154 outputStream* _out;
155 bool _print_concurrent_locks;
156 bool _print_extended_info;
157 bool _print_jni_handle_info;
158 public:
159 VM_PrintThreads()
160 : _out(tty), _print_concurrent_locks(PrintConcurrentLocks), _print_extended_info(false), _print_jni_handle_info(false)
161 {}
162 VM_PrintThreads(outputStream* out, bool print_concurrent_locks, bool print_extended_info, bool print_jni_handle_info)
163 : _out(out), _print_concurrent_locks(print_concurrent_locks), _print_extended_info(print_extended_info),
164 _print_jni_handle_info(print_jni_handle_info)
165 {}
166 VMOp_Type type() const {
167 return VMOp_PrintThreads;
168 }
169 void doit();
170 bool doit_prologue();
171 void doit_epilogue();
172 };
173
174 class VM_PrintMetadata : public VM_Operation {
175 private:
176 outputStream* const _out;
177 const size_t _scale;
178 const int _flags;
179
180 public:
181 VM_PrintMetadata(outputStream* out, size_t scale, int flags)
182 : _out(out), _scale(scale), _flags(flags)
183 {};
184
185 VMOp_Type type() const { return VMOp_PrintMetadata; }
186 void doit();
187 };
188
189 class DeadlockCycle;
190 class VM_FindDeadlocks: public VM_Operation {
191 private:
192 bool _concurrent_locks;
193 DeadlockCycle* _deadlocks;
194 outputStream* _out;
195 ThreadsListSetter _setter; // Helper to set hazard ptr in the originating thread
196 // which protects the JavaThreads in _deadlocks.
197
198 public:
199 VM_FindDeadlocks(bool concurrent_locks) : _concurrent_locks(concurrent_locks), _deadlocks(nullptr), _out(nullptr), _setter() {};
200 VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _deadlocks(nullptr), _out(st) {};
201 ~VM_FindDeadlocks();
202
203 DeadlockCycle* result() { return _deadlocks; };
204 VMOp_Type type() const { return VMOp_FindDeadlocks; }
205 void doit();
206 };
207
208 class ThreadDumpResult;
209 class ThreadSnapshot;
210 class ThreadConcurrentLocks;
211
212 class VM_ThreadDump : public VM_Operation {
213 private:
214 ThreadDumpResult* _result;
215 int _num_threads;
216 GrowableArray<instanceHandle>* _threads;
217 int _max_depth;
218 bool _with_locked_monitors;
219 bool _with_locked_synchronizers;
220
221 void snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl,
222 ObjectMonitorsView* monitors);
223
224 public:
225 VM_ThreadDump(ThreadDumpResult* result,
226 int max_depth, // -1 indicates entire stack
227 bool with_locked_monitors,
228 bool with_locked_synchronizers);
229
230 VM_ThreadDump(ThreadDumpResult* result,
231 GrowableArray<instanceHandle>* threads,
232 int num_threads, // -1 indicates entire stack
233 int max_depth,
234 bool with_locked_monitors,
235 bool with_locked_synchronizers);
236
237 VMOp_Type type() const { return VMOp_ThreadDump; }
238 void doit();
239 bool doit_prologue();
240 void doit_epilogue();
241 };
242
243
244 class VM_Exit: public VM_Operation {
245 private:
246 int _exit_code;
247 static volatile bool _vm_exited;
248 static Thread * volatile _shutdown_thread;
249 static void wait_if_vm_exited();
250 public:
251 VM_Exit(int exit_code) {
252 _exit_code = exit_code;
253 }
254 static int wait_for_threads_in_native_to_block();
255 static int set_vm_exited();
256 static bool vm_exited() { return _vm_exited; }
257 static Thread * shutdown_thread() { return _shutdown_thread; }
258 static void block_if_vm_exited() {
259 if (_vm_exited) {
260 wait_if_vm_exited();
261 }
262 }
263 VMOp_Type type() const { return VMOp_Exit; }
264 void doit();
265 };
266
267 class VM_PrintCompileQueue: public VM_Operation {
268 private:
269 outputStream* _out;
270
271 public:
272 VM_PrintCompileQueue(outputStream* st) : _out(st) {}
273 VMOp_Type type() const { return VMOp_PrintCompileQueue; }
274 void doit();
275 };
276
277 #if INCLUDE_SERVICES
278 class VM_PrintClassHierarchy: public VM_Operation {
279 private:
280 outputStream* _out;
281 bool _print_interfaces;
282 bool _print_subclasses;
283 char* _classname;
284
285 public:
286 VM_PrintClassHierarchy(outputStream* st, bool print_interfaces, bool print_subclasses, char* classname) :
287 _out(st), _print_interfaces(print_interfaces), _print_subclasses(print_subclasses),
288 _classname(classname) {}
289 VMOp_Type type() const { return VMOp_PrintClassHierarchy; }
290 void doit();
291 };
292 #endif // INCLUDE_SERVICES
293
294 #endif // SHARE_RUNTIME_VMOPERATIONS_HPP