jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiThreadState.hpp@e9be0e04635a (annotated)

src/share/vm/prims/jvmtiThreadState.hpp@e9be0e04635a (annotated)

src/share/vm/prims/jvmtiThreadState.hpp

Tue, 06 Jan 2009 07:05:05 -0800

author: jmasa
date: Tue, 06 Jan 2009 07:05:05 -0800
changeset 952: e9be0e04635a
parent 435: a61af66fc99e
child 1043: 0386097d43d8
permissions: -rw-r--r--

6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
Summary: Added safe_object_iterate() for use by JMapPerm.
Reviewed-by: tonyp

 /*
  * Copyright 2003-2006 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.
  *
  */
 #ifndef _JAVA_JVMTITHREADSTATE_H_
 #define _JAVA_JVMTITHREADSTATE_H_
 //
 // Forward Declarations
 //
 class JvmtiEnvBase;
 class JvmtiEnvThreadState;
 class JvmtiDynamicCodeEventCollector;
 enum JvmtiClassLoadKind {
   jvmti_class_load_kind_load = 100,
   jvmti_class_load_kind_retransform,
   jvmti_class_load_kind_redefine
 };
 ///////////////////////////////////////////////////////////////
 //
 // class JvmtiEnvThreadStateIterator
 //
 // The only safe means of iterating through the JvmtiEnvThreadStates
 // in a JvmtiThreadState.
 // Note that this iteratation includes invalid environments pending
 // deallocation -- in fact, some uses depend on this behavior.
 //
 class JvmtiEnvThreadStateIterator : public StackObj {
  private:
   JvmtiThreadState* state;
  public:
   JvmtiEnvThreadStateIterator(JvmtiThreadState* thread_state);
   ~JvmtiEnvThreadStateIterator();
   JvmtiEnvThreadState* first();
   JvmtiEnvThreadState* next(JvmtiEnvThreadState* ets);
 };
 ///////////////////////////////////////////////////////////////
 //
 // class JvmtiThreadState
 //
 // The Jvmti state for each thread (across all JvmtiEnv):
 // 1. Local table of enabled events.
 class JvmtiThreadState : public CHeapObj {
  private:
   friend class JvmtiEnv;
   JavaThread        *_thread;
   bool              _exception_detected;
   bool              _exception_caught;
   bool              _hide_single_stepping;
   bool              _pending_step_for_popframe;
   bool              _pending_step_for_earlyret;
   int               _hide_level;
   // Used to send class being redefined/retransformed and kind of transform
   // info to the class file load hook event handler.
   KlassHandle           *_class_being_redefined;
   JvmtiClassLoadKind    _class_load_kind;
   // This is only valid when is_interp_only_mode() returns true
   int               _cur_stack_depth;
   JvmtiThreadEventEnable _thread_event_enable;
   // for support of JvmtiEnvThreadState
   JvmtiEnvThreadState*   _head_env_thread_state;
   // doubly-linked linear list of active thread state
   // needed in order to iterate the list without holding Threads_lock
   static JvmtiThreadState *_head;
   JvmtiThreadState *_next;
   JvmtiThreadState *_prev;
   // holds the current dynamic code event collector, NULL if no event collector in use
   JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector;
   // holds the current vm object alloc event collector, NULL if no event collector in use
   JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector;
   // Should only be created by factory methods
   JvmtiThreadState(JavaThread *thread);
   friend class JvmtiEnvThreadStateIterator;
   inline JvmtiEnvThreadState* head_env_thread_state();
   inline void set_head_env_thread_state(JvmtiEnvThreadState* ets);
  public:
   ~JvmtiThreadState();
   // is event_type enabled and usable for this thread in any enviroments?
   bool is_enabled(jvmtiEvent event_type) {
     return _thread_event_enable.is_enabled(event_type);
   }
   JvmtiThreadEventEnable *thread_event_enable() {
     return &_thread_event_enable;
   }
   // Must only be called in situations where the state is for the current thread and
   // the environment can not go away.  To be safe, the returned JvmtiEnvThreadState
   // must be used in such a way as there can be no intervening safepoints.
   inline JvmtiEnvThreadState* env_thread_state(JvmtiEnvBase *env);
   static void periodic_clean_up();
   void add_env(JvmtiEnvBase *env);
   // Used by the interpreter for fullspeed debugging support
   bool is_interp_only_mode()                { return _thread->is_interp_only_mode(); }
   void enter_interp_only_mode();
   void leave_interp_only_mode();
   // access to the linked list of all JVMTI thread states
   static JvmtiThreadState *first() {
     assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
     return _head;
   }
   JvmtiThreadState *next()                  {
     return _next;
   }
   // Current stack depth is only valid when is_interp_only_mode() returns true.
   // These functions should only be called at a safepoint - usually called from same thread.
   // Returns the number of Java activations on the stack.
   int cur_stack_depth();
   void invalidate_cur_stack_depth();
   void incr_cur_stack_depth();
   void decr_cur_stack_depth();
   int count_frames();
   inline JavaThread *get_thread()      { return _thread;              }
   inline bool is_exception_detected()  { return _exception_detected;  }
   inline bool is_exception_caught()    { return _exception_caught;  }
   inline void set_exception_detected() { _exception_detected = true;
                                          _exception_caught = false; }
   inline void set_exception_caught()   { _exception_caught = true;
                                          _exception_detected = false; }
   inline void clear_hide_single_stepping() {
     if (_hide_level > 0) {
       _hide_level--;
     } else {
       assert(_hide_single_stepping, "hide_single_stepping is out of phase");
       _hide_single_stepping = false;
     }
   }
   inline bool hide_single_stepping() { return _hide_single_stepping; }
   inline void set_hide_single_stepping() {
     if (_hide_single_stepping) {
       _hide_level++;
     } else {
       assert(_hide_level == 0, "hide_level is out of phase");
       _hide_single_stepping = true;
     }
   }
   // Step pending flag is set when PopFrame is called and it is cleared
   // when step for the Pop Frame is completed.
   // This logic is used to distinguish b/w step for pop frame and repeat step.
   void set_pending_step_for_popframe() { _pending_step_for_popframe = true;  }
   void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; }
   bool is_pending_step_for_popframe()  { return _pending_step_for_popframe;  }
   void process_pending_step_for_popframe();
   // Step pending flag is set when ForceEarlyReturn is called and it is cleared
   // when step for the ForceEarlyReturn is completed.
   // This logic is used to distinguish b/w step for early return and repeat step.
   void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true;  }
   void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; }
   bool is_pending_step_for_earlyret()  { return _pending_step_for_earlyret;  }
   void process_pending_step_for_earlyret();
   // Setter and getter method is used to send redefined class info
   // when class file load hook event is posted.
   // It is set while loading redefined class and cleared before the
   // class file load hook event is posted.
   inline void set_class_being_redefined(KlassHandle *h_class, JvmtiClassLoadKind kind) {
     _class_being_redefined = h_class;
     _class_load_kind = kind;
   }
   inline void clear_class_being_redefined() {
     _class_being_redefined = NULL;
     _class_load_kind = jvmti_class_load_kind_load;
   }
   inline KlassHandle *get_class_being_redefined() {
     return _class_being_redefined;
   }
   inline JvmtiClassLoadKind get_class_load_kind() {
     return _class_load_kind;
   }
   // RedefineClasses support
   // The bug 6214132 caused the verification to fail.
   //
   // Below is the detailed description of the fix approach taken:
   // 1. What's done in RedefineClasses() before verification:
   //  a) A reference to the class being redefined (_the_class) and a
   //     reference to new version of the class (_scratch_class) are
   //     saved here for use during the bytecode verification phase of
   //     RedefineClasses. See RedefineVerifyMark for how these fields
   //     are managed.
   //   b) The _java_mirror field from _the_class is copied to the
   //     _java_mirror field in _scratch_class. This means that a jclass
   //     returned for _the_class or _scratch_class will refer to the
   //     same Java mirror. The verifier will see the "one true mirror"
   //     for the class being verified.
   // 2. What is done at verification:
   //   When the verifier makes calls into the VM to ask questions about
   //   the class being verified, it will pass the jclass to JVM_* functions.
   //   The jclass is always pointing to the mirror of _the_class.
   //   ~28 JVM_* functions called by the verifier for the information
   //   about CP entries and klass structure should check the jvmtiThreadState
   //   info about equivalent klass versions and use it to replace a klassOop
   //   of _the_class with a klassOop of _scratch_class. The function
   //   class_to_verify_considering_redefinition() must be called for it.
   //
   //   Note again, that this redirection happens only for the verifier thread.
   //   Other threads have very small overhead by checking the existence
   //   of the jvmtiThreadSate and the information about klasses equivalence.
   //   No JNI functions need to be changed, they don't reference the klass guts.
   //   The JavaThread pointer is already available in all JVM_* functions
   //   used by the verifier, so there is no extra performance issue with it.
  private:
   KlassHandle *_the_class_for_redefinition_verification;
   KlassHandle *_scratch_class_for_redefinition_verification;
  public:
   inline void set_class_versions_map(KlassHandle *the_class,
                                      KlassHandle *scratch_class) {
     _the_class_for_redefinition_verification = the_class;
     _scratch_class_for_redefinition_verification = scratch_class;
   }
   inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); }
   static inline
   klassOop class_to_verify_considering_redefinition(klassOop klass,
                                                     JavaThread *thread) {
     JvmtiThreadState *state = thread->jvmti_thread_state();
     if (state != NULL && state->_the_class_for_redefinition_verification != NULL) {
       if ((*(state->_the_class_for_redefinition_verification))() == klass) {
         klass = (*(state->_scratch_class_for_redefinition_verification))();
       }
     }
     return klass;
   }
   // Todo: get rid of this!
  private:
   bool _debuggable;
  public:
   // Should the thread be enumerated by jvmtiInternal::GetAllThreads?
   bool is_debuggable()                 { return _debuggable; }
   // If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable
   void set_debuggable(bool debuggable) { _debuggable = debuggable; }
  public:
   bool may_be_walked();
   // Thread local event collector setter and getter methods.
   JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() {
     return _dynamic_code_event_collector;
   }
   JvmtiVMObjectAllocEventCollector* get_vm_object_alloc_event_collector() {
     return _vm_object_alloc_event_collector;
   }
   void set_dynamic_code_event_collector(JvmtiDynamicCodeEventCollector* collector) {
     _dynamic_code_event_collector = collector;
   }
   void set_vm_object_alloc_event_collector(JvmtiVMObjectAllocEventCollector* collector) {
     _vm_object_alloc_event_collector = collector;
   }
   //
   // Frame routines
   //
  public:
   //  true when the thread was suspended with a pointer to the last Java frame.
   bool has_last_frame()                     { return _thread->has_last_Java_frame(); }
   void update_for_pop_top_frame();
   // already holding JvmtiThreadState_lock - retrieve or create JvmtiThreadState
   inline static JvmtiThreadState *state_for_while_locked(JavaThread *thread) {
     assert(JvmtiThreadState_lock->is_locked(), "sanity check");
     JvmtiThreadState *state = thread->jvmti_thread_state();
     if (state == NULL) {
       state = new JvmtiThreadState(thread);
     }
     return state;
   }
   // retrieve or create JvmtiThreadState
   inline static JvmtiThreadState *state_for(JavaThread *thread) {
     JvmtiThreadState *state = thread->jvmti_thread_state();
     if (state == NULL) {
       MutexLocker mu(JvmtiThreadState_lock);
       // check again with the lock held
       state = state_for_while_locked(thread);
     } else {
       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
     }
     return state;
   }
   // JVMTI ForceEarlyReturn support
   // This is set to earlyret_pending to signal that top Java frame
   // should be returned immediately
  public:
   int           _earlyret_state;
   TosState      _earlyret_tos;
   jvalue        _earlyret_value;
   oop           _earlyret_oop;         // Used to return an oop result into Java code from
                                        // ForceEarlyReturnObject, GC-preserved
   // Setting and clearing earlyret_state
   // earlyret_pending indicates that a ForceEarlyReturn() has been
   // requested and not yet been completed.
  public:
   enum EarlyretState {
     earlyret_inactive = 0,
     earlyret_pending  = 1
   };
   void set_earlyret_pending(void) { _earlyret_state = earlyret_pending;  }
   void clr_earlyret_pending(void) { _earlyret_state = earlyret_inactive; }
   bool is_earlyret_pending(void)  { return (_earlyret_state == earlyret_pending);  }
   TosState earlyret_tos()                            { return _earlyret_tos; }
   oop  earlyret_oop() const                          { return _earlyret_oop; }
   void set_earlyret_oop (oop x)                      { _earlyret_oop = x;    }
   jvalue earlyret_value()                            { return _earlyret_value; }
   void set_earlyret_value(jvalue val, TosState tos)  { _earlyret_tos = tos;  _earlyret_value = val;  }
   void clr_earlyret_value()                          { _earlyret_tos = ilgl; _earlyret_value.j = 0L; }
   static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); }
   static ByteSize earlyret_tos_offset()   { return byte_offset_of(JvmtiThreadState, _earlyret_tos); }
   static ByteSize earlyret_oop_offset()   { return byte_offset_of(JvmtiThreadState, _earlyret_oop); }
   static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); }
   void oops_do(OopClosure* f); // GC support
 };
 class RedefineVerifyMark : public StackObj {
  private:
   JvmtiThreadState *_state;
  public:
   RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class,
                      JvmtiThreadState *state) : _state(state)
   {
     _state->set_class_versions_map(the_class, scratch_class);
     (*scratch_class)->set_java_mirror((*the_class)->java_mirror());
   }
   ~RedefineVerifyMark() {
     _state->clear_class_versions_map();
   }
 };
 #endif   /* _JAVA_JVMTITHREADSTATE_H_ */

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/jvmtiThreadState.hpp@e9be0e04635a (annotated)

src/share/vm/prims/jvmtiThreadState.hpp