vm_operations.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1997, 2009, 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// The following classes are used for operations 26// initiated by a Java thread but that must 27// take place in the VMThread. 28 29#define VM_OP_ENUM(type) VMOp_##type, 30 31// Note: When new VM_XXX comes up, add 'XXX' to the template table. 32#define VM_OPS_DO(template) \ 33 template(Dummy) \ 34 template(ThreadStop) \ 35 template(ThreadDump) \ 36 template(PrintThreads) \ 37 template(FindDeadlocks) \ 38 template(ForceSafepoint) \ 39 template(ForceAsyncSafepoint) \ 40 template(Deoptimize) \ 41 template(DeoptimizeFrame) \ 42 template(DeoptimizeAll) \ 43 template(ZombieAll) \ 44 template(HandleFullCodeCache) \ 45 template(Verify) \ 46 template(PrintJNI) \ 47 template(HeapDumper) \ 48 template(DeoptimizeTheWorld) \ 49 template(GC_HeapInspection) \ 50 template(GenCollectFull) \ 51 template(GenCollectFullConcurrent) \ 52 template(GenCollectForAllocation) \ 53 template(GenCollectForPermanentAllocation) \ 54 template(ParallelGCFailedAllocation) \ 55 template(ParallelGCFailedPermanentAllocation) \ 56 template(ParallelGCSystemGC) \ 57 template(CGC_Operation) \ 58 template(CMS_Initial_Mark) \ 59 template(CMS_Final_Remark) \ 60 template(G1CollectFull) \ 61 template(G1CollectForAllocation) \ 62 template(G1IncCollectionPause) \ 63 template(EnableBiasedLocking) \ 64 template(RevokeBias) \ 65 template(BulkRevokeBias) \ 66 template(PopulateDumpSharedSpace) \ 67 template(JNIFunctionTableCopier) \ 68 template(RedefineClasses) \ 69 template(GetOwnedMonitorInfo) \ 70 template(GetObjectMonitorUsage) \ 71 template(GetCurrentContendedMonitor) \ 72 template(GetStackTrace) \ 73 template(GetMultipleStackTraces) \ 74 template(GetAllStackTraces) \ 75 template(GetThreadListStackTraces) \ 76 template(GetFrameCount) \ 77 template(GetFrameLocation) \ 78 template(ChangeBreakpoints) \ 79 template(GetOrSetLocal) \ 80 template(GetCurrentLocation) \ 81 template(EnterInterpOnlyMode) \ 82 template(ChangeSingleStep) \ 83 template(HeapWalkOperation) \ 84 template(HeapIterateOperation) \ 85 template(ReportJavaOutOfMemory) \ 86 template(Exit) \ 87 88class VM_Operation: public CHeapObj { 89 public: 90 enum Mode { 91 _safepoint, // blocking, safepoint, vm_op C-heap allocated 92 _no_safepoint, // blocking, no safepoint, vm_op C-Heap allocated 93 _concurrent, // non-blocking, no safepoint, vm_op C-Heap allocated 94 _async_safepoint // non-blocking, safepoint, vm_op C-Heap allocated 95 }; 96 97 enum VMOp_Type { 98 VM_OPS_DO(VM_OP_ENUM) 99 VMOp_Terminating 100 }; 101 102 private: 103 Thread* _calling_thread; 104 ThreadPriority _priority; 105 long _timestamp; 106 VM_Operation* _next; 107 VM_Operation* _prev; 108 109 // The VM operation name array 110 static const char* _names[]; 111 112 public: 113 VM_Operation() { _calling_thread = NULL; _next = NULL; _prev = NULL; } 114 virtual ~VM_Operation() {} 115 116 // VM operation support (used by VM thread) 117 Thread* calling_thread() const { return _calling_thread; } 118 ThreadPriority priority() { return _priority; } 119 void set_calling_thread(Thread* thread, ThreadPriority priority); 120 121 long timestamp() const { return _timestamp; } 122 void set_timestamp(long timestamp) { _timestamp = timestamp; } 123 124 // Called by VM thread - does in turn invoke doit(). Do not override this 125 void evaluate(); 126 127 // evaluate() is called by the VMThread and in turn calls doit(). 128 // If the thread invoking VMThread::execute((VM_Operation*) is a JavaThread, 129 // doit_prologue() is called in that thread before transferring control to 130 // the VMThread. 131 // If doit_prologue() returns true the VM operation will proceed, and 132 // doit_epilogue() will be called by the JavaThread once the VM operation 133 // completes. If doit_prologue() returns false the VM operation is cancelled. 134 virtual void doit() = 0; 135 virtual bool doit_prologue() { return true; }; 136 virtual void doit_epilogue() {}; // Note: Not called if mode is: _concurrent 137 138 // Type test 139 virtual bool is_methodCompiler() const { return false; } 140 141 // Linking 142 VM_Operation *next() const { return _next; } 143 VM_Operation *prev() const { return _prev; } 144 void set_next(VM_Operation *next) { _next = next; } 145 void set_prev(VM_Operation *prev) { _prev = prev; } 146 147 // Configuration. Override these appropriatly in subclasses. 148 virtual VMOp_Type type() const = 0; 149 virtual Mode evaluation_mode() const { return _safepoint; } 150 virtual bool allow_nested_vm_operations() const { return false; } 151 virtual bool is_cheap_allocated() const { return false; } 152 virtual void oops_do(OopClosure* f) { /* do nothing */ }; 153 154 // CAUTION: <don't hang yourself with following rope> 155 // If you override these methods, make sure that the evaluation 156 // of these methods is race-free and non-blocking, since these 157 // methods may be evaluated either by the mutators or by the 158 // vm thread, either concurrently with mutators or with the mutators 159 // stopped. In other words, taking locks is verboten, and if there 160 // are any races in evaluating the conditions, they'd better be benign. 161 virtual bool evaluate_at_safepoint() const { 162 return evaluation_mode() == _safepoint || 163 evaluation_mode() == _async_safepoint; 164 } 165 virtual bool evaluate_concurrently() const { 166 return evaluation_mode() == _concurrent || 167 evaluation_mode() == _async_safepoint; 168 } 169 170 // Debugging 171 void print_on_error(outputStream* st) const; 172 const char* name() const { return _names[type()]; } 173 static const char* name(int type) { 174 assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type"); 175 return _names[type]; 176 } 177#ifndef PRODUCT 178 void print_on(outputStream* st) const { print_on_error(st); } 179#endif 180}; 181 182class VM_ThreadStop: public VM_Operation { 183 private: 184 oop _thread; // The Thread that the Throwable is thrown against 185 oop _throwable; // The Throwable thrown at the target Thread 186 public: 187 // All oops are passed as JNI handles, since there is no guarantee that a GC might happen before the 188 // VM operation is executed. 189 VM_ThreadStop(oop thread, oop throwable) { 190 _thread = thread; 191 _throwable = throwable; 192 } 193 VMOp_Type type() const { return VMOp_ThreadStop; } 194 oop target_thread() const { return _thread; } 195 oop throwable() const { return _throwable;} 196 void doit(); 197 // We deoptimize if top-most frame is compiled - this might require a C2I adapter to be generated 198 bool allow_nested_vm_operations() const { return true; } 199 Mode evaluation_mode() const { return _async_safepoint; } 200 bool is_cheap_allocated() const { return true; } 201 202 // GC support 203 void oops_do(OopClosure* f) { 204 f->do_oop(&_thread); f->do_oop(&_throwable); 205 } 206}; 207 208// dummy vm op, evaluated just to force a safepoint 209class VM_ForceSafepoint: public VM_Operation { 210 public: 211 VM_ForceSafepoint() {} 212 void doit() {} 213 VMOp_Type type() const { return VMOp_ForceSafepoint; } 214}; 215 216// dummy vm op, evaluated just to force a safepoint 217class VM_ForceAsyncSafepoint: public VM_Operation { 218 public: 219 VM_ForceAsyncSafepoint() {} 220 void doit() {} 221 VMOp_Type type() const { return VMOp_ForceAsyncSafepoint; } 222 Mode evaluation_mode() const { return _async_safepoint; } 223 bool is_cheap_allocated() const { return true; } 224}; 225 226class VM_Deoptimize: public VM_Operation { 227 public: 228 VM_Deoptimize() {} 229 VMOp_Type type() const { return VMOp_Deoptimize; } 230 void doit(); 231 bool allow_nested_vm_operations() const { return true; } 232}; 233 234class VM_DeoptimizeFrame: public VM_Operation { 235 private: 236 JavaThread* _thread; 237 intptr_t* _id; 238 public: 239 VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id); 240 VMOp_Type type() const { return VMOp_DeoptimizeFrame; } 241 void doit(); 242 bool allow_nested_vm_operations() const { return true; } 243}; 244 245class VM_HandleFullCodeCache: public VM_Operation { 246 private: 247 bool _is_full; 248 public: 249 VM_HandleFullCodeCache(bool is_full) { _is_full = is_full; } 250 VMOp_Type type() const { return VMOp_HandleFullCodeCache; } 251 void doit(); 252 bool allow_nested_vm_operations() const { return true; } 253}; 254 255#ifndef PRODUCT 256class VM_DeoptimizeAll: public VM_Operation { 257 private: 258 KlassHandle _dependee; 259 public: 260 VM_DeoptimizeAll() {} 261 VMOp_Type type() const { return VMOp_DeoptimizeAll; } 262 void doit(); 263 bool allow_nested_vm_operations() const { return true; } 264}; 265 266 267class VM_ZombieAll: public VM_Operation { 268 public: 269 VM_ZombieAll() {} 270 VMOp_Type type() const { return VMOp_ZombieAll; } 271 void doit(); 272 bool allow_nested_vm_operations() const { return true; } 273}; 274#endif // PRODUCT 275 276class VM_Verify: public VM_Operation { 277 private: 278 KlassHandle _dependee; 279 public: 280 VM_Verify() {} 281 VMOp_Type type() const { return VMOp_Verify; } 282 void doit(); 283}; 284 285 286class VM_PrintThreads: public VM_Operation { 287 private: 288 outputStream* _out; 289 bool _print_concurrent_locks; 290 public: 291 VM_PrintThreads() { _out = tty; _print_concurrent_locks = PrintConcurrentLocks; } 292 VM_PrintThreads(outputStream* out, bool print_concurrent_locks) { _out = out; _print_concurrent_locks = print_concurrent_locks; } 293 VMOp_Type type() const { return VMOp_PrintThreads; } 294 void doit(); 295 bool doit_prologue(); 296 void doit_epilogue(); 297}; 298 299class VM_PrintJNI: public VM_Operation { 300 private: 301 outputStream* _out; 302 public: 303 VM_PrintJNI() { _out = tty; } 304 VM_PrintJNI(outputStream* out) { _out = out; } 305 VMOp_Type type() const { return VMOp_PrintJNI; } 306 void doit(); 307}; 308 309class DeadlockCycle; 310class VM_FindDeadlocks: public VM_Operation { 311 private: 312 bool _concurrent_locks; 313 DeadlockCycle* _deadlocks; 314 outputStream* _out; 315 316 public: 317 VM_FindDeadlocks(bool concurrent_locks) : _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL) {}; 318 VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _out(st), _deadlocks(NULL) {}; 319 ~VM_FindDeadlocks(); 320 321 DeadlockCycle* result() { return _deadlocks; }; 322 VMOp_Type type() const { return VMOp_FindDeadlocks; } 323 void doit(); 324 bool doit_prologue(); 325}; 326 327class ThreadDumpResult; 328class ThreadSnapshot; 329class ThreadConcurrentLocks; 330 331class VM_ThreadDump : public VM_Operation { 332 private: 333 ThreadDumpResult* _result; 334 int _num_threads; 335 GrowableArray<instanceHandle>* _threads; 336 int _max_depth; 337 bool _with_locked_monitors; 338 bool _with_locked_synchronizers; 339 340 ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl); 341 342 public: 343 VM_ThreadDump(ThreadDumpResult* result, 344 int max_depth, // -1 indicates entire stack 345 bool with_locked_monitors, 346 bool with_locked_synchronizers); 347 348 VM_ThreadDump(ThreadDumpResult* result, 349 GrowableArray<instanceHandle>* threads, 350 int num_threads, // -1 indicates entire stack 351 int max_depth, 352 bool with_locked_monitors, 353 bool with_locked_synchronizers); 354 355 VMOp_Type type() const { return VMOp_ThreadDump; } 356 void doit(); 357 bool doit_prologue(); 358 void doit_epilogue(); 359}; 360 361 362class VM_Exit: public VM_Operation { 363 private: 364 int _exit_code; 365 static volatile bool _vm_exited; 366 static Thread * _shutdown_thread; 367 static void wait_if_vm_exited(); 368 public: 369 VM_Exit(int exit_code) { 370 _exit_code = exit_code; 371 } 372 static int wait_for_threads_in_native_to_block(); 373 static int set_vm_exited(); 374 static bool vm_exited() { return _vm_exited; } 375 static void block_if_vm_exited() { 376 if (_vm_exited) { 377 wait_if_vm_exited(); 378 } 379 } 380 VMOp_Type type() const { return VMOp_Exit; } 381 void doit(); 382}; 383