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Java example source code file (jvmtiThreadState.hpp)

This example Java source code file (jvmtiThreadState.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

bytesize, javathread, jvmticlassloadkind, jvmtidynamiccodeeventcollector, jvmtienvthreadstate, jvmtienvthreadstateiterator, jvmtithreadeventenable, jvmtithreadstate, klasshandle, null, redefineverifymark, share_vm_prims_jvmtithreadstate_hpp, stackobj, tosstate

The jvmtiThreadState.hpp Java example source code

/*
 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP
#define SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP

#include "jvmtifiles/jvmti.h"
#include "memory/allocation.hpp"
#include "memory/allocation.inline.hpp"
#include "prims/jvmtiEventController.hpp"
#include "runtime/thread.hpp"
#include "utilities/growableArray.hpp"

//
// 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<mtInternal> {
 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 clear_exception_detected() {
    _exception_detected = false;
    assert(_exception_caught == false, "_exception_caught is out of phase");
  }
  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 Klass*
  //   of _the_class with a Klass* 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
  Klass* class_to_verify_considering_redefinition(Klass* 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
  // Can return NULL if JavaThread is exiting.
  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) {
      if (thread->is_exiting()) {
        // don't add a JvmtiThreadState to a thread that is exiting
        return NULL;
      }

      state = new JvmtiThreadState(thread);
    }
    return state;
  }

  // retrieve or create JvmtiThreadState
  // Can return NULL if JavaThread is exiting.
  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) NOT_JVMTI_RETURN; // GC support

public:
  void set_should_post_on_exceptions(bool val) { _thread->set_should_post_on_exceptions_flag(val ? JNI_TRUE : JNI_FALSE); }
};

class RedefineVerifyMark : public StackObj {
 private:
  JvmtiThreadState *_state;
  KlassHandle       _scratch_class;
  Handle            _scratch_mirror;

 public:
  RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class,
                     JvmtiThreadState *state) : _state(state), _scratch_class(*scratch_class)
  {
    _state->set_class_versions_map(the_class, scratch_class);
    _scratch_mirror = Handle(_scratch_class->java_mirror());
    (*scratch_class)->set_java_mirror((*the_class)->java_mirror());
  }

  ~RedefineVerifyMark() {
    // Restore the scratch class's mirror, so when scratch_class is removed
    // the correct mirror pointing to it can be cleared.
    _scratch_class->set_java_mirror(_scratch_mirror());
    _state->clear_class_versions_map();
  }
};

#endif // SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP

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