1 /* 2 * Copyright (c) 1997, 2014, 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_VM_OPERATIONS_HPP 26 #define SHARE_VM_RUNTIME_VM_OPERATIONS_HPP 27 28 #include "classfile/javaClasses.hpp" 29 #include "memory/allocation.hpp" 30 #include "oops/oop.hpp" 31 #include "runtime/thread.hpp" 32 #include "utilities/top.hpp" 33 34 // The following classes are used for operations 35 // initiated by a Java thread but that must 36 // take place in the VMThread. 37 38 #define VM_OP_ENUM(type) VMOp_##type, 39 40 // Note: When new VM_XXX comes up, add 'XXX' to the template table. 41 #define VM_OPS_DO(template) \ 42 template(Dummy) \ 43 template(ThreadStop) \ 44 template(ThreadDump) \ 45 template(PrintThreads) \ 46 template(FindDeadlocks) \ 47 template(ForceSafepoint) \ 48 template(ForceAsyncSafepoint) \ 49 template(Deoptimize) \ 50 template(DeoptimizeFrame) \ 51 template(DeoptimizeAll) \ 52 template(ZombieAll) \ 53 template(UnlinkSymbols) \ 54 template(Verify) \ 55 template(PrintJNI) \ 56 template(HeapDumper) \ 57 template(DeoptimizeTheWorld) \ 58 template(CollectForMetadataAllocation) \ 59 template(GC_HeapInspection) \ 60 template(GenCollectFull) \ 61 template(GenCollectFullConcurrent) \ 62 template(GenCollectForAllocation) \ 63 template(ParallelGCFailedAllocation) \ 64 template(ParallelGCSystemGC) \ 65 template(CGC_Operation) \ 66 template(CMS_Initial_Mark) \ 67 template(CMS_Final_Remark) \ 68 template(G1CollectFull) \ 69 template(G1CollectForAllocation) \ 70 template(G1IncCollectionPause) \ 71 template(DestroyAllocationContext) \ 72 template(EnableBiasedLocking) \ 73 template(RevokeBias) \ 74 template(BulkRevokeBias) \ 75 template(PopulateDumpSharedSpace) \ 76 template(JNIFunctionTableCopier) \ 77 template(RedefineClasses) \ 78 template(UpdateForPopTopFrame) \ 79 template(SetFramePop) \ 80 template(GetOwnedMonitorInfo) \ 81 template(GetObjectMonitorUsage) \ 82 template(GetCurrentContendedMonitor) \ 83 template(GetStackTrace) \ 84 template(GetMultipleStackTraces) \ 85 template(GetAllStackTraces) \ 86 template(GetThreadListStackTraces) \ 87 template(GetFrameCount) \ 88 template(GetFrameLocation) \ 89 template(ChangeBreakpoints) \ 90 template(GetOrSetLocal) \ 91 template(GetCurrentLocation) \ 92 template(EnterInterpOnlyMode) \ 93 template(ChangeSingleStep) \ 94 template(HeapWalkOperation) \ 95 template(HeapIterateOperation) \ 96 template(ReportJavaOutOfMemory) \ 97 template(JFRCheckpoint) \ 98 template(Exit) \ 99 template(LinuxDllLoad) \ 100 template(RotateGCLog) \ 101 template(WhiteBoxOperation) \ 102 template(ClassLoaderStatsOperation) \ 103 template(DumpHashtable) \ 104 template(MarkActiveNMethods) \ 105 template(PrintCompileQueue) \ 106 template(PrintCodeList) \ 107 template(PrintCodeCache) \ 108 109 class VM_Operation: public CHeapObj<mtInternal> { 110 public: 111 enum Mode { 112 _safepoint, // blocking, safepoint, vm_op C-heap allocated 113 _no_safepoint, // blocking, no safepoint, vm_op C-Heap allocated 114 _concurrent, // non-blocking, no safepoint, vm_op C-Heap allocated 115 _async_safepoint // non-blocking, safepoint, vm_op C-Heap allocated 116 }; 117 118 enum VMOp_Type { 119 VM_OPS_DO(VM_OP_ENUM) 120 VMOp_Terminating 121 }; 122 123 private: 124 Thread* _calling_thread; 125 ThreadPriority _priority; 126 long _timestamp; 127 VM_Operation* _next; 128 VM_Operation* _prev; 129 130 // The VM operation name array 131 static const char* _names[]; 132 133 public: 134 VM_Operation() { _calling_thread = NULL; _next = NULL; _prev = NULL; } 135 virtual ~VM_Operation() {} 136 137 // VM operation support (used by VM thread) 138 Thread* calling_thread() const { return _calling_thread; } 139 ThreadPriority priority() { return _priority; } 140 void set_calling_thread(Thread* thread, ThreadPriority priority); 141 142 long timestamp() const { return _timestamp; } 143 void set_timestamp(long timestamp) { _timestamp = timestamp; } 144 145 // Called by VM thread - does in turn invoke doit(). Do not override this 146 void evaluate(); 147 148 // evaluate() is called by the VMThread and in turn calls doit(). 149 // If the thread invoking VMThread::execute((VM_Operation*) is a JavaThread, 150 // doit_prologue() is called in that thread before transferring control to 151 // the VMThread. 152 // If doit_prologue() returns true the VM operation will proceed, and 153 // doit_epilogue() will be called by the JavaThread once the VM operation 154 // completes. If doit_prologue() returns false the VM operation is cancelled. 155 virtual void doit() = 0; 156 virtual bool doit_prologue() { return true; }; 157 virtual void doit_epilogue() {}; // Note: Not called if mode is: _concurrent 158 159 // Type test 160 virtual bool is_methodCompiler() const { return false; } 161 162 // Linking 163 VM_Operation *next() const { return _next; } 164 VM_Operation *prev() const { return _prev; } 165 void set_next(VM_Operation *next) { _next = next; } 166 void set_prev(VM_Operation *prev) { _prev = prev; } 167 168 // Configuration. Override these appropriately in subclasses. 169 virtual VMOp_Type type() const = 0; 170 virtual Mode evaluation_mode() const { return _safepoint; } 171 virtual bool allow_nested_vm_operations() const { return false; } 172 virtual bool is_cheap_allocated() const { return false; } 173 virtual void oops_do(OopClosure* f) { /* do nothing */ }; 174 175 // CAUTION: <don't hang yourself with following rope> 176 // If you override these methods, make sure that the evaluation 177 // of these methods is race-free and non-blocking, since these 178 // methods may be evaluated either by the mutators or by the 179 // vm thread, either concurrently with mutators or with the mutators 180 // stopped. In other words, taking locks is verboten, and if there 181 // are any races in evaluating the conditions, they'd better be benign. 182 virtual bool evaluate_at_safepoint() const { 183 return evaluation_mode() == _safepoint || 184 evaluation_mode() == _async_safepoint; 185 } 186 virtual bool evaluate_concurrently() const { 187 return evaluation_mode() == _concurrent || 188 evaluation_mode() == _async_safepoint; 189 } 190 191 static const char* mode_to_string(Mode mode); 192 193 // Debugging 194 void print_on_error(outputStream* st) const; 195 const char* name() const { return _names[type()]; } 196 static const char* name(int type) { 197 assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type"); 198 return _names[type]; 199 } 200 #ifndef PRODUCT 201 void print_on(outputStream* st) const { print_on_error(st); } 202 #endif 203 }; 204 205 class VM_ThreadStop: public VM_Operation { 206 private: 207 oop _thread; // The Thread that the Throwable is thrown against 208 oop _throwable; // The Throwable thrown at the target Thread 209 public: 210 // All oops are passed as JNI handles, since there is no guarantee that a GC might happen before the 211 // VM operation is executed. 212 VM_ThreadStop(oop thread, oop throwable) { 213 _thread = thread; 214 _throwable = throwable; 215 } 216 VMOp_Type type() const { return VMOp_ThreadStop; } 217 oop target_thread() const { return _thread; } 218 oop throwable() const { return _throwable;} 219 void doit(); 220 // We deoptimize if top-most frame is compiled - this might require a C2I adapter to be generated 221 bool allow_nested_vm_operations() const { return true; } 222 Mode evaluation_mode() const { return _async_safepoint; } 223 bool is_cheap_allocated() const { return true; } 224 225 // GC support 226 void oops_do(OopClosure* f) { 227 f->do_oop(&_thread); f->do_oop(&_throwable); 228 } 229 }; 230 231 // dummy vm op, evaluated just to force a safepoint 232 class VM_ForceSafepoint: public VM_Operation { 233 public: 234 VM_ForceSafepoint() {} 235 void doit() {} 236 VMOp_Type type() const { return VMOp_ForceSafepoint; } 237 }; 238 239 // dummy vm op, evaluated just to force a safepoint 240 class VM_ForceAsyncSafepoint: public VM_Operation { 241 public: 242 VM_ForceAsyncSafepoint() {} 243 void doit() {} 244 VMOp_Type type() const { return VMOp_ForceAsyncSafepoint; } 245 Mode evaluation_mode() const { return _async_safepoint; } 246 bool is_cheap_allocated() const { return true; } 247 }; 248 249 class VM_Deoptimize: public VM_Operation { 250 public: 251 VM_Deoptimize() {} 252 VMOp_Type type() const { return VMOp_Deoptimize; } 253 void doit(); 254 bool allow_nested_vm_operations() const { return true; } 255 }; 256 257 class VM_MarkActiveNMethods: public VM_Operation { 258 public: 259 VM_MarkActiveNMethods() {} 260 VMOp_Type type() const { return VMOp_MarkActiveNMethods; } 261 void doit(); 262 bool allow_nested_vm_operations() const { return true; } 263 }; 264 265 // Deopt helper that can deoptimize frames in threads other than the 266 // current thread. Only used through Deoptimization::deoptimize_frame. 267 class VM_DeoptimizeFrame: public VM_Operation { 268 friend class Deoptimization; 269 270 private: 271 JavaThread* _thread; 272 intptr_t* _id; 273 VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id); 274 275 public: 276 VMOp_Type type() const { return VMOp_DeoptimizeFrame; } 277 void doit(); 278 bool allow_nested_vm_operations() const { return true; } 279 }; 280 281 #ifndef PRODUCT 282 class VM_DeoptimizeAll: public VM_Operation { 283 private: 284 KlassHandle _dependee; 285 public: 286 VM_DeoptimizeAll() {} 287 VMOp_Type type() const { return VMOp_DeoptimizeAll; } 288 void doit(); 289 bool allow_nested_vm_operations() const { return true; } 290 }; 291 292 293 class VM_ZombieAll: public VM_Operation { 294 public: 295 VM_ZombieAll() {} 296 VMOp_Type type() const { return VMOp_ZombieAll; } 297 void doit(); 298 bool allow_nested_vm_operations() const { return true; } 299 }; 300 #endif // PRODUCT 301 302 class VM_UnlinkSymbols: public VM_Operation { 303 public: 304 VM_UnlinkSymbols() {} 305 VMOp_Type type() const { return VMOp_UnlinkSymbols; } 306 void doit(); 307 bool allow_nested_vm_operations() const { return true; } 308 }; 309 310 class VM_Verify: public VM_Operation { 311 private: 312 bool _silent; 313 public: 314 VM_Verify(bool silent = VerifySilently) : _silent(silent) {} 315 VMOp_Type type() const { return VMOp_Verify; } 316 void doit(); 317 }; 318 319 320 class VM_PrintThreads: public VM_Operation { 321 private: 322 outputStream* _out; 323 bool _print_concurrent_locks; 324 public: 325 VM_PrintThreads() { _out = tty; _print_concurrent_locks = PrintConcurrentLocks; } 326 VM_PrintThreads(outputStream* out, bool print_concurrent_locks) { _out = out; _print_concurrent_locks = print_concurrent_locks; } 327 VMOp_Type type() const { return VMOp_PrintThreads; } 328 void doit(); 329 bool doit_prologue(); 330 void doit_epilogue(); 331 }; 332 333 class VM_PrintJNI: public VM_Operation { 334 private: 335 outputStream* _out; 336 public: 337 VM_PrintJNI() { _out = tty; } 338 VM_PrintJNI(outputStream* out) { _out = out; } 339 VMOp_Type type() const { return VMOp_PrintJNI; } 340 void doit(); 341 }; 342 343 class DeadlockCycle; 344 class VM_FindDeadlocks: public VM_Operation { 345 private: 346 bool _concurrent_locks; 347 DeadlockCycle* _deadlocks; 348 outputStream* _out; 349 350 public: 351 VM_FindDeadlocks(bool concurrent_locks) : _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL) {}; 352 VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _out(st), _deadlocks(NULL) {}; 353 ~VM_FindDeadlocks(); 354 355 DeadlockCycle* result() { return _deadlocks; }; 356 VMOp_Type type() const { return VMOp_FindDeadlocks; } 357 void doit(); 358 bool doit_prologue(); 359 }; 360 361 class ThreadDumpResult; 362 class ThreadSnapshot; 363 class ThreadConcurrentLocks; 364 365 class VM_ThreadDump : public VM_Operation { 366 private: 367 ThreadDumpResult* _result; 368 int _num_threads; 369 GrowableArray<instanceHandle>* _threads; 370 int _max_depth; 371 bool _with_locked_monitors; 372 bool _with_locked_synchronizers; 373 374 ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl); 375 376 public: 377 VM_ThreadDump(ThreadDumpResult* result, 378 int max_depth, // -1 indicates entire stack 379 bool with_locked_monitors, 380 bool with_locked_synchronizers); 381 382 VM_ThreadDump(ThreadDumpResult* result, 383 GrowableArray<instanceHandle>* threads, 384 int num_threads, // -1 indicates entire stack 385 int max_depth, 386 bool with_locked_monitors, 387 bool with_locked_synchronizers); 388 389 VMOp_Type type() const { return VMOp_ThreadDump; } 390 void doit(); 391 bool doit_prologue(); 392 void doit_epilogue(); 393 }; 394 395 396 class VM_Exit: public VM_Operation { 397 private: 398 int _exit_code; 399 static volatile bool _vm_exited; 400 static Thread * _shutdown_thread; 401 static void wait_if_vm_exited(); 402 public: 403 VM_Exit(int exit_code) { 404 _exit_code = exit_code; 405 } 406 static int wait_for_threads_in_native_to_block(); 407 static int set_vm_exited(); 408 static bool vm_exited() { return _vm_exited; } 409 static void block_if_vm_exited() { 410 if (_vm_exited) { 411 wait_if_vm_exited(); 412 } 413 } 414 VMOp_Type type() const { return VMOp_Exit; } 415 void doit(); 416 }; 417 418 419 class VM_RotateGCLog: public VM_Operation { 420 private: 421 outputStream* _out; 422 423 public: 424 VM_RotateGCLog(outputStream* st) : _out(st) {} 425 VMOp_Type type() const { return VMOp_RotateGCLog; } 426 void doit() { gclog_or_tty->rotate_log(true, _out); } 427 }; 428 429 class VM_PrintCompileQueue: public VM_Operation { 430 private: 431 outputStream* _out; 432 433 public: 434 VM_PrintCompileQueue(outputStream* st) : _out(st) {} 435 VMOp_Type type() const { return VMOp_PrintCompileQueue; } 436 void doit(); 437 }; 438 439 class VM_PrintCodeList: public VM_Operation { 440 private: 441 outputStream* _out; 442 443 public: 444 VM_PrintCodeList(outputStream* st) : _out(st) {} 445 VMOp_Type type() const { return VMOp_PrintCodeList; } 446 void doit(); 447 }; 448 449 class VM_PrintCodeCache: public VM_Operation { 450 private: 451 outputStream* _out; 452 453 public: 454 VM_PrintCodeCache(outputStream* st) : _out(st) {} 455 VMOp_Type type() const { return VMOp_PrintCodeCache; } 456 void doit(); 457 }; 458 459 460 #endif // SHARE_VM_RUNTIME_VM_OPERATIONS_HPP