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 ---