rev 1083 : code cache unloading for webrev 091214
1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any 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(Verify) \ 45 template(PrintJNI) \ 46 template(HeapDumper) \ 47 template(DeoptimizeTheWorld) \ 48 template(GC_HeapInspection) \ 49 template(GenCollectFull) \ 50 template(GenCollectFullConcurrent) \ 51 template(GenCollectForAllocation) \ 52 template(GenCollectForPermanentAllocation) \ 53 template(ParallelGCFailedAllocation) \ 54 template(ParallelGCFailedPermanentAllocation) \ 55 template(ParallelGCSystemGC) \ 56 template(CGC_Operation) \ 57 template(CMS_Initial_Mark) \ 58 template(CMS_Final_Remark) \ 59 template(G1CollectFull) \ 60 template(G1CollectForAllocation) \ 61 template(G1IncCollectionPause) \ 62 template(EnableBiasedLocking) \ 63 template(RevokeBias) \ 64 template(BulkRevokeBias) \ 65 template(PopulateDumpSharedSpace) \ 66 template(JNIFunctionTableCopier) \ 67 template(RedefineClasses) \ 68 template(GetOwnedMonitorInfo) \ 69 template(GetObjectMonitorUsage) \ 70 template(GetCurrentContendedMonitor) \ 71 template(GetStackTrace) \ 72 template(GetMultipleStackTraces) \ 73 template(GetAllStackTraces) \ 74 template(GetThreadListStackTraces) \ 75 template(GetFrameCount) \ 76 template(GetFrameLocation) \ 77 template(ChangeBreakpoints) \ 78 template(GetOrSetLocal) \ 79 template(GetCurrentLocation) \ 80 template(EnterInterpOnlyMode) \ 81 template(ChangeSingleStep) \ 82 template(HeapWalkOperation) \ 83 template(HeapIterateOperation) \ 84 template(ReportJavaOutOfMemory) \ 85 template(Exit) \ 86 87 class VM_Operation: public CHeapObj { 88 public: 89 enum Mode { 90 _safepoint, // blocking, safepoint, vm_op C-heap allocated 91 _no_safepoint, // blocking, no safepoint, vm_op C-Heap allocated 92 _concurrent, // non-blocking, no safepoint, vm_op C-Heap allocated 93 _async_safepoint // non-blocking, safepoint, vm_op C-Heap allocated 94 }; 95 96 enum VMOp_Type { 97 VM_OPS_DO(VM_OP_ENUM) 98 VMOp_Terminating 99 }; 100 101 private: 102 Thread* _calling_thread; 103 ThreadPriority _priority; 104 long _timestamp; 105 VM_Operation* _next; 106 VM_Operation* _prev; 107 108 // The VM operation name array 109 static const char* _names[]; 110 111 public: 112 VM_Operation() { _calling_thread = NULL; _next = NULL; _prev = NULL; } 113 virtual ~VM_Operation() {} 114 115 // VM operation support (used by VM thread) 116 Thread* calling_thread() const { return _calling_thread; } 117 ThreadPriority priority() { return _priority; } 118 void set_calling_thread(Thread* thread, ThreadPriority priority); 119 120 long timestamp() const { return _timestamp; } 121 void set_timestamp(long timestamp) { _timestamp = timestamp; } 122 123 // Called by VM thread - does in turn invoke doit(). Do not override this 124 void evaluate(); 125 126 // evaluate() is called by the VMThread and in turn calls doit(). 127 // If the thread invoking VMThread::execute((VM_Operation*) is a JavaThread, 128 // doit_prologue() is called in that thread before transferring control to 129 // the VMThread. 130 // If doit_prologue() returns true the VM operation will proceed, and 131 // doit_epilogue() will be called by the JavaThread once the VM operation 132 // completes. If doit_prologue() returns false the VM operation is cancelled. 133 virtual void doit() = 0; 134 virtual bool doit_prologue() { return true; }; 135 virtual void doit_epilogue() {}; // Note: Not called if mode is: _concurrent 136 137 // Type test 138 virtual bool is_methodCompiler() const { return false; } 139 140 // Linking 141 VM_Operation *next() const { return _next; } 142 VM_Operation *prev() const { return _prev; } 143 void set_next(VM_Operation *next) { _next = next; } 144 void set_prev(VM_Operation *prev) { _prev = prev; } 145 146 // Configuration. Override these appropriatly in subclasses. 147 virtual VMOp_Type type() const = 0; 148 virtual Mode evaluation_mode() const { return _safepoint; } 149 virtual bool allow_nested_vm_operations() const { return false; } 150 virtual bool is_cheap_allocated() const { return false; } 151 virtual void oops_do(OopClosure* f) { /* do nothing */ }; 152 153 // CAUTION: <don't hang yourself with following rope> 154 // If you override these methods, make sure that the evaluation 155 // of these methods is race-free and non-blocking, since these 156 // methods may be evaluated either by the mutators or by the 157 // vm thread, either concurrently with mutators or with the mutators 158 // stopped. In other words, taking locks is verboten, and if there 159 // are any races in evaluating the conditions, they'd better be benign. 160 virtual bool evaluate_at_safepoint() const { 161 return evaluation_mode() == _safepoint || 162 evaluation_mode() == _async_safepoint; 163 } 164 virtual bool evaluate_concurrently() const { 165 return evaluation_mode() == _concurrent || 166 evaluation_mode() == _async_safepoint; 167 } 168 169 // Debugging 170 void print_on_error(outputStream* st) const; 171 const char* name() const { return _names[type()]; } 172 static const char* name(int type) { 173 assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type"); 174 return _names[type]; 175 } 176 #ifndef PRODUCT 177 void print_on(outputStream* st) const { print_on_error(st); } 178 #endif 179 }; 180 181 class VM_ThreadStop: public VM_Operation { 182 private: 183 oop _thread; // The Thread that the Throwable is thrown against 184 oop _throwable; // The Throwable thrown at the target Thread 185 public: 186 // All oops are passed as JNI handles, since there is no guarantee that a GC might happen before the 187 // VM operation is executed. 188 VM_ThreadStop(oop thread, oop throwable) { 189 _thread = thread; 190 _throwable = throwable; 191 } 192 VMOp_Type type() const { return VMOp_ThreadStop; } 193 oop target_thread() const { return _thread; } 194 oop throwable() const { return _throwable;} 195 void doit(); 196 // We deoptimize if top-most frame is compiled - this might require a C2I adapter to be generated 197 bool allow_nested_vm_operations() const { return true; } 198 Mode evaluation_mode() const { return _async_safepoint; } 199 bool is_cheap_allocated() const { return true; } 200 201 // GC support 202 void oops_do(OopClosure* f) { 203 f->do_oop(&_thread); f->do_oop(&_throwable); 204 } 205 }; 206 207 // dummy vm op, evaluated just to force a safepoint 208 class VM_ForceSafepoint: public VM_Operation { 209 public: 210 VM_ForceSafepoint() {} 211 void doit() {} 212 VMOp_Type type() const { return VMOp_ForceSafepoint; } 213 }; 214 215 // dummy vm op, evaluated just to force a safepoint 216 class VM_ForceAsyncSafepoint: public VM_Operation { 217 public: 218 VM_ForceAsyncSafepoint() {} 219 void doit() {} 220 VMOp_Type type() const { return VMOp_ForceAsyncSafepoint; } 221 Mode evaluation_mode() const { return _async_safepoint; } 222 bool is_cheap_allocated() const { return true; } 223 }; 224 225 class VM_Deoptimize: public VM_Operation { 226 public: 227 VM_Deoptimize() {} 228 VMOp_Type type() const { return VMOp_Deoptimize; } 229 void doit(); 230 bool allow_nested_vm_operations() const { return true; } 231 }; 232 233 class VM_DeoptimizeFrame: public VM_Operation { 234 private: 235 JavaThread* _thread; 236 intptr_t* _id; 237 public: 238 VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id); 239 VMOp_Type type() const { return VMOp_DeoptimizeFrame; } 240 void doit(); 241 bool allow_nested_vm_operations() const { return true; } 242 }; 243 244 #ifndef PRODUCT 245 class VM_DeoptimizeAll: public VM_Operation { 246 private: 247 KlassHandle _dependee; 248 public: 249 VM_DeoptimizeAll() {} 250 VMOp_Type type() const { return VMOp_DeoptimizeAll; } 251 void doit(); 252 bool allow_nested_vm_operations() const { return true; } 253 }; 254 255 256 class VM_ZombieAll: public VM_Operation { 257 public: 258 VM_ZombieAll() {} 259 VMOp_Type type() const { return VMOp_ZombieAll; } 260 void doit(); 261 bool allow_nested_vm_operations() const { return true; } 262 }; 263 #endif // PRODUCT 264 265 class VM_Verify: public VM_Operation { 266 private: 267 KlassHandle _dependee; 268 public: 269 VM_Verify() {} 270 VMOp_Type type() const { return VMOp_Verify; } 271 void doit(); 272 }; 273 274 275 class VM_PrintThreads: public VM_Operation { 276 private: 277 outputStream* _out; 278 bool _print_concurrent_locks; 279 public: 280 VM_PrintThreads() { _out = tty; _print_concurrent_locks = PrintConcurrentLocks; } 281 VM_PrintThreads(outputStream* out, bool print_concurrent_locks) { _out = out; _print_concurrent_locks = print_concurrent_locks; } 282 VMOp_Type type() const { return VMOp_PrintThreads; } 283 void doit(); 284 bool doit_prologue(); 285 void doit_epilogue(); 286 }; 287 288 class VM_PrintJNI: public VM_Operation { 289 private: 290 outputStream* _out; 291 public: 292 VM_PrintJNI() { _out = tty; } 293 VM_PrintJNI(outputStream* out) { _out = out; } 294 VMOp_Type type() const { return VMOp_PrintJNI; } 295 void doit(); 296 }; 297 298 class DeadlockCycle; 299 class VM_FindDeadlocks: public VM_Operation { 300 private: 301 bool _concurrent_locks; 302 DeadlockCycle* _deadlocks; 303 outputStream* _out; 304 305 public: 306 VM_FindDeadlocks(bool concurrent_locks) : _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL) {}; 307 VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _out(st), _deadlocks(NULL) {}; 308 ~VM_FindDeadlocks(); 309 310 DeadlockCycle* result() { return _deadlocks; }; 311 VMOp_Type type() const { return VMOp_FindDeadlocks; } 312 void doit(); 313 bool doit_prologue(); 314 }; 315 316 class ThreadDumpResult; 317 class ThreadSnapshot; 318 class ThreadConcurrentLocks; 319 320 class VM_ThreadDump : public VM_Operation { 321 private: 322 ThreadDumpResult* _result; 323 int _num_threads; 324 GrowableArray<instanceHandle>* _threads; 325 int _max_depth; 326 bool _with_locked_monitors; 327 bool _with_locked_synchronizers; 328 329 ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl); 330 331 public: 332 VM_ThreadDump(ThreadDumpResult* result, 333 int max_depth, // -1 indicates entire stack 334 bool with_locked_monitors, 335 bool with_locked_synchronizers); 336 337 VM_ThreadDump(ThreadDumpResult* result, 338 GrowableArray<instanceHandle>* threads, 339 int num_threads, // -1 indicates entire stack 340 int max_depth, 341 bool with_locked_monitors, 342 bool with_locked_synchronizers); 343 344 VMOp_Type type() const { return VMOp_ThreadDump; } 345 void doit(); 346 bool doit_prologue(); 347 void doit_epilogue(); 348 }; 349 350 351 class VM_Exit: public VM_Operation { 352 private: 353 int _exit_code; 354 static volatile bool _vm_exited; 355 static Thread * _shutdown_thread; 356 static void wait_if_vm_exited(); 357 public: 358 VM_Exit(int exit_code) { 359 _exit_code = exit_code; 360 } 361 static int wait_for_threads_in_native_to_block(); 362 static int set_vm_exited(); 363 static bool vm_exited() { return _vm_exited; } 364 static void block_if_vm_exited() { 365 if (_vm_exited) { 366 wait_if_vm_exited(); 367 } 368 } 369 VMOp_Type type() const { return VMOp_Exit; } 370 void doit(); 371 }; --- EOF ---