/*

 * 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.

 *

 *

 */

#ifndef _JAVA_JVMTIENVTHREADSTATE_H_

#define _JAVA_JVMTIENVTHREADSTATE_H_

///////////////////////////////////////////////////////////////

//

// class JvmtiFramePop

// Used by              : JvmtiFramePops

// Used by JVMTI methods: none directly.

//

// Wrapper class for FramePop, used in the JvmtiFramePops class.

//

// Two problems: 1) this isn't being used as a ValueObj class, in

// several places there are constructors for it. 2) It seems like

// overkill as a means to get an assert and name the geater than

// operator.  I'm trying to to rewrite everything.

class JvmtiFramePop VALUE_OBJ_CLASS_SPEC {

 private:

  // Frame number counting from BOTTOM (oldest) frame;

  // bottom frame == #0

  int _frame_number;

 public:

  JvmtiFramePop() {}

  JvmtiFramePop(int frame_number) {

    assert(frame_number >= 0, "invalid frame number");

    _frame_number = frame_number;

  }

  int frame_number() { return _frame_number; }

  int above_on_stack(JvmtiFramePop& other) { return _frame_number > other._frame_number; }

  void print() PRODUCT_RETURN;

};

///////////////////////////////////////////////////////////////

//

// class JvmtiFramePops

// Used by              : JvmtiThreadState

// Used by JVMTI methods: none directly.

//

// A collection of JvmtiFramePop.

// It records what frames on a threads stack should post frame_pop events when they're exited.

//

class JvmtiFramePops : public CHeapObj {

 private:

  GrowableArray<int>* _pops;

  // should only be used by JvmtiEventControllerPrivate

  // to insure they only occur at safepoints.

  // Todo: add checks for safepoint

  friend class JvmtiEventControllerPrivate;

  void set(JvmtiFramePop& fp);

  void clear(JvmtiFramePop& fp);

  int clear_to(JvmtiFramePop& fp);

 public:

  JvmtiFramePops();

  ~JvmtiFramePops();

  bool contains(JvmtiFramePop& fp) { return _pops->contains(fp.frame_number()); }

  int length() { return _pops->length(); }

  void print() PRODUCT_RETURN;

};

///////////////////////////////////////////////////////////////

//

// class JvmtiEnvThreadState

//

// 2. Cache of pending frame_pop_events, created by NotifyFramePop

//    and lazily initialized.

// 3: Location of last executed instruction, used to filter out duplicate

//    events due to instruction rewriting.

class JvmtiEnvThreadState : public CHeapObj {

private:

  friend class JvmtiEnv;

  JavaThread        *_thread;

  JvmtiEnv          *_env;

  JvmtiEnvThreadState *_next;

  jmethodID         _current_method_id;

  int               _current_bci;

  bool              _breakpoint_posted;

  bool              _single_stepping_posted;

  JvmtiEnvThreadEventEnable _event_enable;

  void              *_agent_thread_local_storage_data; // per env and per thread agent allocated data.

  // Class used to store pending framepops.

  // lazily initialized by get_frame_pops();

  JvmtiFramePops *_frame_pops;

  inline void set_current_location(jmethodID method_id, int bci) {

    _current_method_id = method_id;

    _current_bci  = bci;

  }

  friend class JvmtiEnvThreadStateIterator;

  JvmtiEnvThreadState* next() { return _next; }

  friend class JvmtiThreadState;

  void set_next(JvmtiEnvThreadState* link) { _next = link; }

public:

  JvmtiEnvThreadState(JavaThread *thread, JvmtiEnvBase *env);

  ~JvmtiEnvThreadState();

  bool is_enabled(jvmtiEvent event_type) { return _event_enable.is_enabled(event_type); }

  JvmtiEnvThreadEventEnable *event_enable() { return &_event_enable; }

  void *get_agent_thread_local_storage_data() { return _agent_thread_local_storage_data; }

  void set_agent_thread_local_storage_data (void *data) { _agent_thread_local_storage_data = data; }

  // If the thread is in the given method at the given

  // location just return.  Otherwise, reset the current location

  // and reset _breakpoint_posted and _single_stepping_posted.

  // _breakpoint_posted and _single_stepping_posted are only cleared

  // here.

  void compare_and_set_current_location(methodOop method, address location, jvmtiEvent event);

  void clear_current_location() { set_current_location((jmethodID)NULL, 0); }

  void reset_current_location(jvmtiEvent event, bool enabled);

  inline void set_breakpoint_posted()  { _breakpoint_posted = true; }

  inline void set_single_stepping_posted() {

    _single_stepping_posted = true;

  }

  inline bool breakpoint_posted() { return _breakpoint_posted; }

  inline bool single_stepping_posted() {

    return _single_stepping_posted;

  }

  inline JavaThread *get_thread() { return _thread; }

  inline JvmtiEnv *get_env() { return _env; }

  // lazily initialize _frame_pops

  JvmtiFramePops* get_frame_pops();

  bool has_frame_pops();

  // quickly test whether we should deliver a frame pop event on return from sp

  bool is_frame_pop(int cur_stack_depth);

  void set_frame_pop(int frame_number);

  void clear_frame_pop(int frame_number);

  void clear_to_frame_pop(int frame_number);

};

#endif   /* _JAVA_JVMTIENVTHREADSTATE_H_ */