Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 // The following classes are used for operations

 // initiated by a Java thread but that must

 // take place in the VMThread.

 #define VM_OP_ENUM(type)   VMOp_##type,

 // Note: When new VM_XXX comes up, add 'XXX' to the template table.

 #define VM_OPS_DO(template)                       \

   template(Dummy)                                 \

   template(ThreadStop)                            \

   template(ThreadDump)                            \

   template(PrintThreads)                          \

   template(FindDeadlocks)                         \

   template(ForceSafepoint)                        \

   template(ForceAsyncSafepoint)                   \

   template(Deoptimize)                            \

   template(DeoptimizeFrame)                       \

   template(DeoptimizeAll)                         \

   template(ZombieAll)                             \

   template(Verify)                                \

   template(PrintJNI)                              \

   template(HeapDumper)                            \

   template(DeoptimizeTheWorld)                    \

   template(GC_HeapInspection)                     \

   template(GenCollectFull)                        \

   template(GenCollectFullConcurrent)              \

   template(GenCollectForAllocation)               \

   template(GenCollectForPermanentAllocation)      \

   template(ParallelGCFailedAllocation)            \

   template(ParallelGCFailedPermanentAllocation)   \

   template(ParallelGCSystemGC)                    \

   template(CMS_Initial_Mark)                      \

   template(CMS_Final_Remark)                      \

   template(EnableBiasedLocking)                   \

   template(RevokeBias)                            \

   template(BulkRevokeBias)                        \

   template(PopulateDumpSharedSpace)               \

   template(JNIFunctionTableCopier)                \

   template(RedefineClasses)                       \

   template(GetOwnedMonitorInfo)                   \

   template(GetObjectMonitorUsage)                 \

   template(GetCurrentContendedMonitor)            \

   template(GetStackTrace)                         \

   template(GetMultipleStackTraces)                \

   template(GetAllStackTraces)                     \

   template(GetThreadListStackTraces)              \

   template(GetFrameCount)                         \

   template(GetFrameLocation)                      \

   template(ChangeBreakpoints)                     \

   template(GetOrSetLocal)                         \

   template(GetCurrentLocation)                    \

   template(EnterInterpOnlyMode)                   \

   template(ChangeSingleStep)                      \

   template(HeapWalkOperation)                     \

   template(HeapIterateOperation)                  \

   template(ReportJavaOutOfMemory)                 \

   template(Exit)                                  \

 class VM_Operation: public CHeapObj {

  public:

   enum Mode {

     _safepoint,       // blocking,        safepoint, vm_op C-heap allocated

     _no_safepoint,    // blocking,     no safepoint, vm_op C-Heap allocated

     _concurrent,      // non-blocking, no safepoint, vm_op C-Heap allocated

     _async_safepoint  // non-blocking,    safepoint, vm_op C-Heap allocated

   };

   enum VMOp_Type {

     VM_OPS_DO(VM_OP_ENUM)

     VMOp_Terminating

   };

  private:

   Thread*         _calling_thread;

   ThreadPriority  _priority;

   long            _timestamp;

   VM_Operation*   _next;

   VM_Operation*   _prev;

   // The VM operation name array

   static const char* _names[];

  public:

   VM_Operation()  { _calling_thread = NULL; _next = NULL; _prev = NULL; }

   virtual ~VM_Operation() {}

   // VM operation support (used by VM thread)

   Thread* calling_thread() const                 { return _calling_thread; }

   ThreadPriority priority()                      { return _priority; }

   void set_calling_thread(Thread* thread, ThreadPriority priority);

   long timestamp() const              { return _timestamp; }

   void set_timestamp(long timestamp)  { _timestamp = timestamp; }

   // Called by VM thread - does in turn invoke doit(). Do not override this

   void evaluate();

   // evaluate() is called by the VMThread and in turn calls doit().

   // If the thread invoking VMThread::execute((VM_Operation*) is a JavaThread,

   // doit_prologue() is called in that thread before transferring control to

   // the VMThread.

   // If doit_prologue() returns true the VM operation will proceed, and

   // doit_epilogue() will be called by the JavaThread once the VM operation

   // completes. If doit_prologue() returns false the VM operation is cancelled.

   virtual void doit()                            = 0;

   virtual bool doit_prologue()                   { return true; };

   virtual void doit_epilogue()                   {}; // Note: Not called if mode is: _concurrent

   // Type test

   virtual bool is_methodCompiler() const         { return false; }

   // Linking

   VM_Operation *next() const                     { return _next; }

   VM_Operation *prev() const                     { return _prev; }

   void set_next(VM_Operation *next)              { _next = next; }

   void set_prev(VM_Operation *prev)              { _prev = prev; }

   // Configuration. Override these appropriatly in subclasses.

   virtual VMOp_Type type() const = 0;

   virtual Mode evaluation_mode() const            { return _safepoint; }

   virtual bool allow_nested_vm_operations() const { return false; }

   virtual bool is_cheap_allocated() const         { return false; }

   virtual void oops_do(OopClosure* f)              { /* do nothing */ };

   // CAUTION: <don't hang yourself with following rope>

   // If you override these methods, make sure that the evaluation

   // of these methods is race-free and non-blocking, since these

   // methods may be evaluated either by the mutators or by the

   // vm thread, either concurrently with mutators or with the mutators

   // stopped. In other words, taking locks is verboten, and if there

   // are any races in evaluating the conditions, they'd better be benign.

   virtual bool evaluate_at_safepoint() const {

     return evaluation_mode() == _safepoint  ||

            evaluation_mode() == _async_safepoint;

   }

   virtual bool evaluate_concurrently() const {

     return evaluation_mode() == _concurrent ||

            evaluation_mode() == _async_safepoint;

   }

   // Debugging

   void print_on_error(outputStream* st) const;

   const char* name() const { return _names[type()]; }

   static const char* name(int type) {

     assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type");

     return _names[type];

   }

 #ifndef PRODUCT

   void print_on(outputStream* st) const { print_on_error(st); }

 #endif

 };

 class VM_ThreadStop: public VM_Operation {

  private:

   oop     _thread;        // The Thread that the Throwable is thrown against

   oop     _throwable;     // The Throwable thrown at the target Thread

  public:

   // All oops are passed as JNI handles, since there is no guarantee that a GC might happen before the

   // VM operation is executed.

   VM_ThreadStop(oop thread, oop throwable) {

     _thread    = thread;

     _throwable = throwable;

   }

   VMOp_Type type() const                         { return VMOp_ThreadStop; }

   oop target_thread() const                      { return _thread; }

   oop throwable() const                          { return _throwable;}

   void doit();

   // We deoptimize if top-most frame is compiled - this might require a C2I adapter to be generated

   bool allow_nested_vm_operations() const        { return true; }

   Mode evaluation_mode() const                   { return _async_safepoint; }

   bool is_cheap_allocated() const                { return true; }

   // GC support

   void oops_do(OopClosure* f) {

     f->do_oop(&_thread); f->do_oop(&_throwable);

   }

 };

 // dummy vm op, evaluated just to force a safepoint

 class VM_ForceSafepoint: public VM_Operation {

  public:

   VM_ForceSafepoint() {}

   void doit()         {}

   VMOp_Type type() const { return VMOp_ForceSafepoint; }

 };

 // dummy vm op, evaluated just to force a safepoint

 class VM_ForceAsyncSafepoint: public VM_Operation {

  public:

   VM_ForceAsyncSafepoint() {}

   void doit()              {}

   VMOp_Type type() const                         { return VMOp_ForceAsyncSafepoint; }

   Mode evaluation_mode() const                   { return _async_safepoint; }

   bool is_cheap_allocated() const                { return true; }

 };

 class VM_Deoptimize: public VM_Operation {

  public:

   VM_Deoptimize() {}

   VMOp_Type type() const                        { return VMOp_Deoptimize; }

   void doit();

   bool allow_nested_vm_operations() const        { return true; }

 };

 class VM_DeoptimizeFrame: public VM_Operation {

  private:

   JavaThread* _thread;

   intptr_t*   _id;

  public:

   VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id);

   VMOp_Type type() const                         { return VMOp_DeoptimizeFrame; }

   void doit();

   bool allow_nested_vm_operations() const        { return true;  }

 };

 #ifndef PRODUCT

 class VM_DeoptimizeAll: public VM_Operation {

  private:

   KlassHandle _dependee;

  public:

   VM_DeoptimizeAll() {}

   VMOp_Type type() const                         { return VMOp_DeoptimizeAll; }

   void doit();

   bool allow_nested_vm_operations() const        { return true; }

 };

 class VM_ZombieAll: public VM_Operation {

  public:

   VM_ZombieAll() {}

   VMOp_Type type() const                         { return VMOp_ZombieAll; }

   void doit();

   bool allow_nested_vm_operations() const        { return true; }

 };

 #endif // PRODUCT

 class VM_Verify: public VM_Operation {

  private:

   KlassHandle _dependee;

  public:

   VM_Verify() {}

   VMOp_Type type() const { return VMOp_Verify; }

   void doit();

 };

 class VM_PrintThreads: public VM_Operation {

  private:

   outputStream* _out;

   bool _print_concurrent_locks;

  public:

   VM_PrintThreads()                                                { _out = tty; _print_concurrent_locks = PrintConcurrentLocks; }

   VM_PrintThreads(outputStream* out, bool print_concurrent_locks)  { _out = out; _print_concurrent_locks = print_concurrent_locks; }

   VMOp_Type type() const                                           {  return VMOp_PrintThreads; }

   void doit();

   bool doit_prologue();

   void doit_epilogue();

 };

 class VM_PrintJNI: public VM_Operation {

  private:

   outputStream* _out;

  public:

   VM_PrintJNI()                         { _out = tty; }

   VM_PrintJNI(outputStream* out)        { _out = out; }

   VMOp_Type type() const                { return VMOp_PrintJNI; }

   void doit();

 };

 class DeadlockCycle;

 class VM_FindDeadlocks: public VM_Operation {

  private:

   bool           _concurrent_locks;

   DeadlockCycle* _deadlocks;

   outputStream*  _out;

  public:

   VM_FindDeadlocks(bool concurrent_locks) :  _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL) {};

   VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _out(st), _deadlocks(NULL) {};

   ~VM_FindDeadlocks();

   DeadlockCycle* result()      { return _deadlocks; };

   VMOp_Type type() const       { return VMOp_FindDeadlocks; }

   void doit();

   bool doit_prologue();

 };

 class ThreadDumpResult;

 class ThreadSnapshot;

 class ThreadConcurrentLocks;

 class VM_ThreadDump : public VM_Operation {

  private:

   ThreadDumpResult*              _result;

   int                            _num_threads;

   GrowableArray<instanceHandle>* _threads;

   int                            _max_depth;

   bool                           _with_locked_monitors;

   bool                           _with_locked_synchronizers;

   ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl);

  public:

   VM_ThreadDump(ThreadDumpResult* result,

                 int max_depth,  // -1 indicates entire stack

                 bool with_locked_monitors,

                 bool with_locked_synchronizers);

   VM_ThreadDump(ThreadDumpResult* result,

                 GrowableArray<instanceHandle>* threads,

                 int num_threads, // -1 indicates entire stack

                 int max_depth,

                 bool with_locked_monitors,

                 bool with_locked_synchronizers);

   VMOp_Type type() const { return VMOp_ThreadDump; }

   void doit();

   bool doit_prologue();

   void doit_epilogue();

 };

 class VM_Exit: public VM_Operation {

  private:

   int  _exit_code;

   static volatile bool _vm_exited;

   static Thread * _shutdown_thread;

   static void wait_if_vm_exited();

  public:

   VM_Exit(int exit_code) {

     _exit_code = exit_code;

   }

   static int wait_for_threads_in_native_to_block();

   static int set_vm_exited();

   static bool vm_exited()                      { return _vm_exited; }

   static void block_if_vm_exited() {

     if (_vm_exited) {

       wait_if_vm_exited();

     }

   }

   VMOp_Type type() const { return VMOp_Exit; }

   void doit();

 };