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src/share/vm/prims/jvmtiThreadState.hpp

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  76  private:
  77   friend class JvmtiEnv;
  78   JavaThread        *_thread;
  79   bool              _hide_single_stepping;
  80   bool              _pending_step_for_popframe;
  81   bool              _pending_step_for_earlyret;
  82   int               _hide_level;
  83 
  84  public:
  85   enum ExceptionState {
  86     ES_CLEARED,
  87     ES_DETECTED,
  88     ES_CAUGHT
  89   };
  90 
  91  private:
  92   ExceptionState _exception_state;
  93 
  94   // Used to send class being redefined/retransformed and kind of transform
  95   // info to the class file load hook event handler.
  96   KlassHandle           *_class_being_redefined;
  97   JvmtiClassLoadKind    _class_load_kind;
  98 
  99   // This is only valid when is_interp_only_mode() returns true
 100   int               _cur_stack_depth;
 101 
 102   JvmtiThreadEventEnable _thread_event_enable;
 103 
 104   // for support of JvmtiEnvThreadState
 105   JvmtiEnvThreadState*   _head_env_thread_state;
 106 
 107   // doubly-linked linear list of active thread state
 108   // needed in order to iterate the list without holding Threads_lock
 109   static JvmtiThreadState *_head;
 110   JvmtiThreadState *_next;
 111   JvmtiThreadState *_prev;
 112 
 113   // holds the current dynamic code event collector, NULL if no event collector in use
 114   JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector;
 115   // holds the current vm object alloc event collector, NULL if no event collector in use
 116   JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector;


 203   // Step pending flag is set when PopFrame is called and it is cleared
 204   // when step for the Pop Frame is completed.
 205   // This logic is used to distinguish b/w step for pop frame and repeat step.
 206   void set_pending_step_for_popframe() { _pending_step_for_popframe = true;  }
 207   void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; }
 208   bool is_pending_step_for_popframe()  { return _pending_step_for_popframe;  }
 209   void process_pending_step_for_popframe();
 210 
 211   // Step pending flag is set when ForceEarlyReturn is called and it is cleared
 212   // when step for the ForceEarlyReturn is completed.
 213   // This logic is used to distinguish b/w step for early return and repeat step.
 214   void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true;  }
 215   void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; }
 216   bool is_pending_step_for_earlyret()  { return _pending_step_for_earlyret;  }
 217   void process_pending_step_for_earlyret();
 218 
 219   // Setter and getter method is used to send redefined class info
 220   // when class file load hook event is posted.
 221   // It is set while loading redefined class and cleared before the
 222   // class file load hook event is posted.
 223   inline void set_class_being_redefined(KlassHandle *h_class, JvmtiClassLoadKind kind) {
 224     _class_being_redefined = h_class;
 225     _class_load_kind = kind;
 226   }
 227 
 228   inline void clear_class_being_redefined() {
 229     _class_being_redefined = NULL;
 230     _class_load_kind = jvmti_class_load_kind_load;
 231   }
 232 
 233   inline KlassHandle *get_class_being_redefined() {
 234     return _class_being_redefined;
 235   }
 236 
 237   inline JvmtiClassLoadKind get_class_load_kind() {
 238     return _class_load_kind;
 239   }
 240 
 241   // RedefineClasses support
 242   // The bug 6214132 caused the verification to fail.
 243   //
 244   // Below is the detailed description of the fix approach taken:
 245   // 1. What's done in RedefineClasses() before verification:
 246   //  a) A reference to the class being redefined (_the_class) and a
 247   //     reference to new version of the class (_scratch_class) are
 248   //     saved here for use during the bytecode verification phase of
 249   //     RedefineClasses. See RedefineVerifyMark for how these fields
 250   //     are managed.
 251   //   b) The _java_mirror field from _the_class is copied to the
 252   //     _java_mirror field in _scratch_class. This means that a jclass
 253   //     returned for _the_class or _scratch_class will refer to the
 254   //     same Java mirror. The verifier will see the "one true mirror"
 255   //     for the class being verified.
 256   // 2. What is done at verification:
 257   //   When the verifier makes calls into the VM to ask questions about
 258   //   the class being verified, it will pass the jclass to JVM_* functions.
 259   //   The jclass is always pointing to the mirror of _the_class.
 260   //   ~28 JVM_* functions called by the verifier for the information
 261   //   about CP entries and klass structure should check the jvmtiThreadState
 262   //   info about equivalent klass versions and use it to replace a Klass*
 263   //   of _the_class with a Klass* of _scratch_class. The function
 264   //   class_to_verify_considering_redefinition() must be called for it.
 265   //
 266   //   Note again, that this redirection happens only for the verifier thread.
 267   //   Other threads have very small overhead by checking the existence
 268   //   of the jvmtiThreadSate and the information about klasses equivalence.
 269   //   No JNI functions need to be changed, they don't reference the klass guts.
 270   //   The JavaThread pointer is already available in all JVM_* functions
 271   //   used by the verifier, so there is no extra performance issue with it.
 272 
 273  private:
 274   KlassHandle *_the_class_for_redefinition_verification;
 275   KlassHandle *_scratch_class_for_redefinition_verification;
 276 
 277  public:
 278   inline void set_class_versions_map(KlassHandle *the_class,
 279                                      KlassHandle *scratch_class) {
 280     _the_class_for_redefinition_verification = the_class;
 281     _scratch_class_for_redefinition_verification = scratch_class;
 282   }
 283 
 284   inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); }
 285 
 286   static inline
 287   Klass* class_to_verify_considering_redefinition(Klass* klass,
 288                                                     JavaThread *thread) {
 289     JvmtiThreadState *state = thread->jvmti_thread_state();
 290     if (state != NULL && state->_the_class_for_redefinition_verification != NULL) {
 291       if ((*(state->_the_class_for_redefinition_verification))() == klass) {
 292         klass = (*(state->_scratch_class_for_redefinition_verification))();
 293       }
 294     }
 295     return klass;
 296   }
 297 
 298   // Todo: get rid of this!
 299  private:
 300   bool _debuggable;
 301  public:
 302   // Should the thread be enumerated by jvmtiInternal::GetAllThreads?
 303   bool is_debuggable()                 { return _debuggable; }
 304   // If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable
 305   void set_debuggable(bool debuggable) { _debuggable = debuggable; }
 306 
 307  public:
 308 
 309   bool may_be_walked();
 310 
 311   // Thread local event collector setter and getter methods.
 312   JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() {


 392   TosState earlyret_tos()                            { return _earlyret_tos; }
 393   oop  earlyret_oop() const                          { return _earlyret_oop; }
 394   void set_earlyret_oop (oop x)                      { _earlyret_oop = x;    }
 395   jvalue earlyret_value()                            { return _earlyret_value; }
 396   void set_earlyret_value(jvalue val, TosState tos)  { _earlyret_tos = tos;  _earlyret_value = val;  }
 397   void clr_earlyret_value()                          { _earlyret_tos = ilgl; _earlyret_value.j = 0L; }
 398 
 399   static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); }
 400   static ByteSize earlyret_tos_offset()   { return byte_offset_of(JvmtiThreadState, _earlyret_tos); }
 401   static ByteSize earlyret_oop_offset()   { return byte_offset_of(JvmtiThreadState, _earlyret_oop); }
 402   static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); }
 403 
 404   void oops_do(OopClosure* f) NOT_JVMTI_RETURN; // GC support
 405 
 406 public:
 407   void set_should_post_on_exceptions(bool val) { _thread->set_should_post_on_exceptions_flag(val ? JNI_TRUE : JNI_FALSE); }
 408 };
 409 
 410 class RedefineVerifyMark : public StackObj {
 411  private:
 412   JvmtiThreadState *_state;
 413   KlassHandle       _scratch_class;
 414   Handle            _scratch_mirror;
 415 
 416  public:
 417   RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class,
 418                      JvmtiThreadState *state) : _state(state), _scratch_class(*scratch_class)
 419   {
 420     _state->set_class_versions_map(the_class, scratch_class);
 421     _scratch_mirror = Handle(Thread::current(), _scratch_class->java_mirror());
 422     (*scratch_class)->set_java_mirror((*the_class)->java_mirror());
 423   }
 424 
 425   ~RedefineVerifyMark() {
 426     // Restore the scratch class's mirror, so when scratch_class is removed
 427     // the correct mirror pointing to it can be cleared.
 428     _scratch_class->set_java_mirror(_scratch_mirror());
 429     _state->clear_class_versions_map();
 430   }
 431 };
 432 
 433 #endif // SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP


  76  private:
  77   friend class JvmtiEnv;
  78   JavaThread        *_thread;
  79   bool              _hide_single_stepping;
  80   bool              _pending_step_for_popframe;
  81   bool              _pending_step_for_earlyret;
  82   int               _hide_level;
  83 
  84  public:
  85   enum ExceptionState {
  86     ES_CLEARED,
  87     ES_DETECTED,
  88     ES_CAUGHT
  89   };
  90 
  91  private:
  92   ExceptionState _exception_state;
  93 
  94   // Used to send class being redefined/retransformed and kind of transform
  95   // info to the class file load hook event handler.
  96   Klass*                _class_being_redefined;
  97   JvmtiClassLoadKind    _class_load_kind;
  98 
  99   // This is only valid when is_interp_only_mode() returns true
 100   int               _cur_stack_depth;
 101 
 102   JvmtiThreadEventEnable _thread_event_enable;
 103 
 104   // for support of JvmtiEnvThreadState
 105   JvmtiEnvThreadState*   _head_env_thread_state;
 106 
 107   // doubly-linked linear list of active thread state
 108   // needed in order to iterate the list without holding Threads_lock
 109   static JvmtiThreadState *_head;
 110   JvmtiThreadState *_next;
 111   JvmtiThreadState *_prev;
 112 
 113   // holds the current dynamic code event collector, NULL if no event collector in use
 114   JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector;
 115   // holds the current vm object alloc event collector, NULL if no event collector in use
 116   JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector;


 203   // Step pending flag is set when PopFrame is called and it is cleared
 204   // when step for the Pop Frame is completed.
 205   // This logic is used to distinguish b/w step for pop frame and repeat step.
 206   void set_pending_step_for_popframe() { _pending_step_for_popframe = true;  }
 207   void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; }
 208   bool is_pending_step_for_popframe()  { return _pending_step_for_popframe;  }
 209   void process_pending_step_for_popframe();
 210 
 211   // Step pending flag is set when ForceEarlyReturn is called and it is cleared
 212   // when step for the ForceEarlyReturn is completed.
 213   // This logic is used to distinguish b/w step for early return and repeat step.
 214   void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true;  }
 215   void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; }
 216   bool is_pending_step_for_earlyret()  { return _pending_step_for_earlyret;  }
 217   void process_pending_step_for_earlyret();
 218 
 219   // Setter and getter method is used to send redefined class info
 220   // when class file load hook event is posted.
 221   // It is set while loading redefined class and cleared before the
 222   // class file load hook event is posted.
 223   inline void set_class_being_redefined(Klass* k, JvmtiClassLoadKind kind) {
 224     _class_being_redefined = k;
 225     _class_load_kind = kind;
 226   }
 227 
 228   inline void clear_class_being_redefined() {
 229     _class_being_redefined = NULL;
 230     _class_load_kind = jvmti_class_load_kind_load;
 231   }
 232 
 233   inline Klass* get_class_being_redefined() {
 234     return _class_being_redefined;
 235   }
 236 
 237   inline JvmtiClassLoadKind get_class_load_kind() {
 238     return _class_load_kind;
 239   }
 240 
 241   // RedefineClasses support
 242   // The bug 6214132 caused the verification to fail.
 243   //
 244   // Below is the detailed description of the fix approach taken:
 245   // 1. What's done in RedefineClasses() before verification:
 246   //  a) A reference to the class being redefined (_the_class) and a
 247   //     reference to new version of the class (_scratch_class) are
 248   //     saved here for use during the bytecode verification phase of
 249   //     RedefineClasses. See RedefineVerifyMark for how these fields
 250   //     are managed.
 251   //   b) The _java_mirror field from _the_class is copied to the
 252   //     _java_mirror field in _scratch_class. This means that a jclass
 253   //     returned for _the_class or _scratch_class will refer to the
 254   //     same Java mirror. The verifier will see the "one true mirror"
 255   //     for the class being verified.
 256   // 2. What is done at verification:
 257   //   When the verifier makes calls into the VM to ask questions about
 258   //   the class being verified, it will pass the jclass to JVM_* functions.
 259   //   The jclass is always pointing to the mirror of _the_class.
 260   //   ~28 JVM_* functions called by the verifier for the information
 261   //   about CP entries and klass structure should check the jvmtiThreadState
 262   //   info about equivalent klass versions and use it to replace a Klass*
 263   //   of _the_class with a Klass* of _scratch_class. The function
 264   //   class_to_verify_considering_redefinition() must be called for it.
 265   //
 266   //   Note again, that this redirection happens only for the verifier thread.
 267   //   Other threads have very small overhead by checking the existence
 268   //   of the jvmtiThreadSate and the information about klasses equivalence.
 269   //   No JNI functions need to be changed, they don't reference the klass guts.
 270   //   The JavaThread pointer is already available in all JVM_* functions
 271   //   used by the verifier, so there is no extra performance issue with it.
 272 
 273  private:
 274   Klass* _the_class_for_redefinition_verification;
 275   Klass* _scratch_class_for_redefinition_verification;
 276 
 277  public:
 278   inline void set_class_versions_map(Klass* the_class,
 279                                      Klass* scratch_class) {
 280     _the_class_for_redefinition_verification = the_class;
 281     _scratch_class_for_redefinition_verification = scratch_class;
 282   }
 283 
 284   inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); }
 285 
 286   static inline
 287   Klass* class_to_verify_considering_redefinition(Klass* klass,
 288                                                     JavaThread *thread) {
 289     JvmtiThreadState *state = thread->jvmti_thread_state();
 290     if (state != NULL && state->_the_class_for_redefinition_verification != NULL) {
 291       if (state->_the_class_for_redefinition_verification == klass) {
 292         klass = state->_scratch_class_for_redefinition_verification;
 293       }
 294     }
 295     return klass;
 296   }
 297 
 298   // Todo: get rid of this!
 299  private:
 300   bool _debuggable;
 301  public:
 302   // Should the thread be enumerated by jvmtiInternal::GetAllThreads?
 303   bool is_debuggable()                 { return _debuggable; }
 304   // If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable
 305   void set_debuggable(bool debuggable) { _debuggable = debuggable; }
 306 
 307  public:
 308 
 309   bool may_be_walked();
 310 
 311   // Thread local event collector setter and getter methods.
 312   JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() {


 392   TosState earlyret_tos()                            { return _earlyret_tos; }
 393   oop  earlyret_oop() const                          { return _earlyret_oop; }
 394   void set_earlyret_oop (oop x)                      { _earlyret_oop = x;    }
 395   jvalue earlyret_value()                            { return _earlyret_value; }
 396   void set_earlyret_value(jvalue val, TosState tos)  { _earlyret_tos = tos;  _earlyret_value = val;  }
 397   void clr_earlyret_value()                          { _earlyret_tos = ilgl; _earlyret_value.j = 0L; }
 398 
 399   static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); }
 400   static ByteSize earlyret_tos_offset()   { return byte_offset_of(JvmtiThreadState, _earlyret_tos); }
 401   static ByteSize earlyret_oop_offset()   { return byte_offset_of(JvmtiThreadState, _earlyret_oop); }
 402   static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); }
 403 
 404   void oops_do(OopClosure* f) NOT_JVMTI_RETURN; // GC support
 405 
 406 public:
 407   void set_should_post_on_exceptions(bool val) { _thread->set_should_post_on_exceptions_flag(val ? JNI_TRUE : JNI_FALSE); }
 408 };
 409 
 410 class RedefineVerifyMark : public StackObj {
 411  private:
 412   JvmtiThreadState* _state;
 413   Klass*            _scratch_class;
 414   Handle            _scratch_mirror;
 415 
 416  public:
 417   RedefineVerifyMark(Klass* the_class, Klass* scratch_class,
 418                      JvmtiThreadState *state) : _state(state), _scratch_class(scratch_class)
 419   {
 420     _state->set_class_versions_map(the_class, scratch_class);
 421     _scratch_mirror = Handle(Thread::current(), _scratch_class->java_mirror());
 422     _scratch_class->set_java_mirror(the_class->java_mirror());
 423   }
 424 
 425   ~RedefineVerifyMark() {
 426     // Restore the scratch class's mirror, so when scratch_class is removed
 427     // the correct mirror pointing to it can be cleared.
 428     _scratch_class->set_java_mirror(_scratch_mirror());
 429     _state->clear_class_versions_map();
 430   }
 431 };
 432 
 433 #endif // SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP
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