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 class VM_ClearICs: public VM_Operation {
64 private:
65 bool _preserve_static_stubs;
66 public:
67 VM_ClearICs(bool preserve_static_stubs) { _preserve_static_stubs = preserve_static_stubs; }
68 void doit();
69 VMOp_Type type() const { return VMOp_ClearICs; }
70 };
71
72 // Base class for invoking parts of a gtest in a safepoint.
73 // Derived classes provide the doit method.
74 // Typically also need to transition the gtest thread from native to VM.
75 class VM_GTestExecuteAtSafepoint: public VM_Operation {
76 public:
77 VMOp_Type type() const { return VMOp_GTestExecuteAtSafepoint; }
78
79 protected:
80 VM_GTestExecuteAtSafepoint() {}
81 };
82
83 class VM_CleanClassLoaderDataMetaspaces : public VM_Operation {
84 public:
85 VM_CleanClassLoaderDataMetaspaces() {}
86 VMOp_Type type() const { return VMOp_CleanClassLoaderDataMetaspaces; }
87 void doit();
88 };
89
90 class VM_RehashStringTable : public VM_Operation {
91 public:
92 VM_RehashStringTable() {}
93 VMOp_Type type() const { return VMOp_RehashStringTable; }
94 void doit();
95 };
96
97 class VM_RehashSymbolTable : public VM_Operation {
98 public:
99 VM_RehashSymbolTable() {}
100 VMOp_Type type() const { return VMOp_RehashSymbolTable; }
101 void doit();
102 };
103
104 // Deopt helper that can deoptimize frames in threads other than the
105 // current thread. Only used through Deoptimization::deoptimize_frame.
106 class VM_DeoptimizeFrame: public VM_Operation {
107 friend class Deoptimization;
108
109 private:
110 JavaThread* _thread;
111 intptr_t* _id;
112 int _reason;
113 VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id, int reason);
114
115 public:
116 VMOp_Type type() const { return VMOp_DeoptimizeFrame; }
117 void doit();
118 bool allow_nested_vm_operations() const { return true; }
119 };
120
121 #ifndef PRODUCT
122 class VM_DeoptimizeAll: public VM_Operation {
123 public:
124 VM_DeoptimizeAll() {}
125 VMOp_Type type() const { return VMOp_DeoptimizeAll; }
126 void doit();
127 bool allow_nested_vm_operations() const { return true; }
128 };
129
130
131 class VM_ZombieAll: public VM_Operation {
132 public:
133 VM_ZombieAll() {}
134 VMOp_Type type() const { return VMOp_ZombieAll; }
135 void doit();
136 bool allow_nested_vm_operations() const { return true; }
137 };
138 #endif // PRODUCT
139
140 class VM_PrintThreads: public VM_Operation {
141 private:
142 outputStream* _out;
143 bool _print_concurrent_locks;
144 bool _print_extended_info;
145 bool _print_jni_handle_info;
146 public:
147 VM_PrintThreads()
148 : _out(tty), _print_concurrent_locks(PrintConcurrentLocks), _print_extended_info(false), _print_jni_handle_info(false)
149 {}
150 VM_PrintThreads(outputStream* out, bool print_concurrent_locks, bool print_extended_info, bool print_jni_handle_info)
151 : _out(out), _print_concurrent_locks(print_concurrent_locks), _print_extended_info(print_extended_info),
152 _print_jni_handle_info(print_jni_handle_info)
153 {}
154 VMOp_Type type() const {
155 return VMOp_PrintThreads;
156 }
157 void doit();
158 bool doit_prologue();
159 void doit_epilogue();
160 };
161
162 class VM_PrintMetadata : public VM_Operation {
163 private:
164 outputStream* const _out;
165 const size_t _scale;
166 const int _flags;
167
168 public:
169 VM_PrintMetadata(outputStream* out, size_t scale, int flags)
170 : _out(out), _scale(scale), _flags(flags)
171 {};
172
173 VMOp_Type type() const { return VMOp_PrintMetadata; }
174 void doit();
175 };
176
177 class DeadlockCycle;
178 class VM_FindDeadlocks: public VM_Operation {
179 private:
180 bool _concurrent_locks;
181 DeadlockCycle* _deadlocks;
182 outputStream* _out;
183 ThreadsListSetter _setter; // Helper to set hazard ptr in the originating thread
184 // which protects the JavaThreads in _deadlocks.
185
186 public:
187 VM_FindDeadlocks(bool concurrent_locks) : _concurrent_locks(concurrent_locks), _deadlocks(nullptr), _out(nullptr), _setter() {};
188 VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _deadlocks(nullptr), _out(st) {};
189 ~VM_FindDeadlocks();
190
191 DeadlockCycle* result() { return _deadlocks; };
192 VMOp_Type type() const { return VMOp_FindDeadlocks; }
193 void doit();
194 };
195
196 class ThreadDumpResult;
197 class ThreadSnapshot;
198 class ThreadConcurrentLocks;
199
200 class VM_ThreadDump : public VM_Operation {
201 private:
202 ThreadDumpResult* _result;
203 int _num_threads;
204 GrowableArray<instanceHandle>* _threads;
205 int _max_depth;
206 bool _with_locked_monitors;
207 bool _with_locked_synchronizers;
208
209 void snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl,
210 ObjectMonitorsView* monitors);
211
212 public:
213 VM_ThreadDump(ThreadDumpResult* result,
214 int max_depth, // -1 indicates entire stack
215 bool with_locked_monitors,
216 bool with_locked_synchronizers);
217
218 VM_ThreadDump(ThreadDumpResult* result,
219 GrowableArray<instanceHandle>* threads,
220 int num_threads, // -1 indicates entire stack
221 int max_depth,
222 bool with_locked_monitors,
223 bool with_locked_synchronizers);
224
225 VMOp_Type type() const { return VMOp_ThreadDump; }
226 void doit();
227 bool doit_prologue();
228 void doit_epilogue();
229 };
230
231
232 class VM_Exit: public VM_Operation {
233 private:
234 int _exit_code;
235 static volatile bool _vm_exited;
236 static Thread * volatile _shutdown_thread;
237 static void wait_if_vm_exited();
238 public:
239 VM_Exit(int exit_code) {
240 _exit_code = exit_code;
241 }
242 static int wait_for_threads_in_native_to_block();
243 static int set_vm_exited();
244 static bool vm_exited() { return _vm_exited; }
245 static Thread * shutdown_thread() { return _shutdown_thread; }
246 static void block_if_vm_exited() {
247 if (_vm_exited) {
248 wait_if_vm_exited();
249 }
250 }
251 VMOp_Type type() const { return VMOp_Exit; }
252 void doit();
253 };
254
255 class VM_PrintCompileQueue: public VM_Operation {
256 private:
257 outputStream* _out;
258
259 public:
260 VM_PrintCompileQueue(outputStream* st) : _out(st) {}
261 VMOp_Type type() const { return VMOp_PrintCompileQueue; }
262 void doit();
263 };
264
265 #if INCLUDE_SERVICES
266 class VM_PrintClassHierarchy: public VM_Operation {
267 private:
268 outputStream* _out;
269 bool _print_interfaces;
270 bool _print_subclasses;
271 char* _classname;
272
273 public:
274 VM_PrintClassHierarchy(outputStream* st, bool print_interfaces, bool print_subclasses, char* classname) :
275 _out(st), _print_interfaces(print_interfaces), _print_subclasses(print_subclasses),
276 _classname(classname) {}
277 VMOp_Type type() const { return VMOp_PrintClassHierarchy; }
278 void doit();
279 };
280 #endif // INCLUDE_SERVICES
281
282 #endif // SHARE_RUNTIME_VMOPERATIONS_HPP