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 /*

  * Copyright (c) 2003, 2010, 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

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 #ifndef SHARE_VM_PRIMS_JVMTIEVENTCONTROLLER_HPP

 #define SHARE_VM_PRIMS_JVMTIEVENTCONTROLLER_HPP

 #include "jvmtifiles/jvmti.h"

 #include "memory/allocation.hpp"

 #include "memory/allocation.inline.hpp"

 #include "utilities/globalDefinitions.hpp"

 // forward declaration

 class JvmtiEventControllerPrivate;

 class JvmtiEventController;

 class JvmtiEnvThreadState;

 class JvmtiFramePop;

 class JvmtiEnvBase;

 // Extension event support

 //

 // jvmtiExtEvent is the extensions equivalent of jvmtiEvent

 // jvmtiExtCallbacks is the extensions equivalent of jvmtiEventCallbacks

 // Extension events start JVMTI_MIN_EVENT_TYPE_VAL-1 and work towards 0.

 typedef enum {

   EXT_EVENT_CLASS_UNLOAD = JVMTI_MIN_EVENT_TYPE_VAL-1,

   EXT_MIN_EVENT_TYPE_VAL = EXT_EVENT_CLASS_UNLOAD,

   EXT_MAX_EVENT_TYPE_VAL = EXT_EVENT_CLASS_UNLOAD

 } jvmtiExtEvent;

 typedef struct {

   jvmtiExtensionEvent ClassUnload;

 } jvmtiExtEventCallbacks;

 // The complete range of events is EXT_MIN_EVENT_TYPE_VAL to

 // JVMTI_MAX_EVENT_TYPE_VAL (inclusive and contiguous).

 const int TOTAL_MIN_EVENT_TYPE_VAL = EXT_MIN_EVENT_TYPE_VAL;

 const int TOTAL_MAX_EVENT_TYPE_VAL = JVMTI_MAX_EVENT_TYPE_VAL;

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

 //

 // JvmtiEventEnabled

 //

 // Utility class

 //

 // A boolean array indexed by event_type, used as an internal

 // data structure to track what JVMTI event types are enabled.

 // Used for user set enabling and disabling (globally and on a

 // per thread basis), and for computed merges across environments,

 // threads and the VM as a whole.

 //

 // for inlines see jvmtiEventController_inline.hpp

 //

 class JvmtiEventEnabled VALUE_OBJ_CLASS_SPEC {

 private:

   friend class JvmtiEventControllerPrivate;

   jlong _enabled_bits;

 #ifndef PRODUCT

   enum {

     JEE_INIT_GUARD = 0xEAD0

   } _init_guard;

 #endif

   static jlong bit_for(jvmtiEvent event_type);

   jlong get_bits();

   void set_bits(jlong bits);

 public:

   JvmtiEventEnabled();

   void clear();

   bool is_enabled(jvmtiEvent event_type);

   void set_enabled(jvmtiEvent event_type, bool enabled);

 };

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

 //

 // JvmtiEnvThreadEventEnable

 //

 // JvmtiEventController data specific to a particular environment and thread.

 //

 // for inlines see jvmtiEventController_inline.hpp

 //

 class JvmtiEnvThreadEventEnable VALUE_OBJ_CLASS_SPEC {

 private:

   friend class JvmtiEventControllerPrivate;

   JvmtiEventEnabled _event_user_enabled;

   JvmtiEventEnabled _event_enabled;

 public:

   JvmtiEnvThreadEventEnable();

   ~JvmtiEnvThreadEventEnable();

   bool is_enabled(jvmtiEvent event_type);

   void set_user_enabled(jvmtiEvent event_type, bool enabled);

 };

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

 //

 // JvmtiThreadEventEnable

 //

 // JvmtiEventController data specific to a particular thread.

 //

 // for inlines see jvmtiEventController_inline.hpp

 //

 class JvmtiThreadEventEnable VALUE_OBJ_CLASS_SPEC {

 private:

   friend class JvmtiEventControllerPrivate;

   JvmtiEventEnabled _event_enabled;

 public:

   JvmtiThreadEventEnable();

   ~JvmtiThreadEventEnable();

   bool is_enabled(jvmtiEvent event_type);

 };

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

 //

 // JvmtiEnvEventEnable

 //

 // JvmtiEventController data specific to a particular environment.

 //

 // for inlines see jvmtiEventController_inline.hpp

 //

 class JvmtiEnvEventEnable VALUE_OBJ_CLASS_SPEC {

 private:

   friend class JvmtiEventControllerPrivate;

   // user set global event enablement indexed by jvmtiEvent

   JvmtiEventEnabled _event_user_enabled;

   // this flag indicates the presence (true) or absence (false) of event callbacks

   // it is indexed by jvmtiEvent

   JvmtiEventEnabled _event_callback_enabled;

   // indexed by jvmtiEvent true if enabled globally or on any thread.

   // True only if there is a callback for it.

   JvmtiEventEnabled _event_enabled;

 public:

   JvmtiEnvEventEnable();

   ~JvmtiEnvEventEnable();

   bool is_enabled(jvmtiEvent event_type);

   void set_user_enabled(jvmtiEvent event_type, bool enabled);

 };

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

 //

 // JvmtiEventController

 //

 // The class is the access point for all actions that change

 // which events are active, this include:

 //      enabling and disabling events

 //      changing the callbacks/eventhook (they may be null)

 //      setting and clearing field watchpoints

 //      setting frame pops

 //      encountering frame pops

 //

 // for inlines see jvmtiEventController_inline.hpp

 //

 class JvmtiEventController : AllStatic {

 private:

   friend class JvmtiEventControllerPrivate;

   // for all environments, global array indexed by jvmtiEvent

   static JvmtiEventEnabled _universal_global_event_enabled;

 public:

   static bool is_enabled(jvmtiEvent event_type);

   // events that can ONLY be enabled/disabled globally (can't toggle on individual threads).

   static bool is_global_event(jvmtiEvent event_type);

   // is the event_type valid?

   // to do: check against valid event array

   static bool is_valid_event_type(jvmtiEvent event_type) {

     return ((int)event_type >= TOTAL_MIN_EVENT_TYPE_VAL)

         && ((int)event_type <= TOTAL_MAX_EVENT_TYPE_VAL);

   }

   // Use (thread == NULL) to enable/disable an event globally.

   // Use (thread != NULL) to enable/disable an event for a particular thread.

   // thread is ignored for events that can only be specified globally

   static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,

                                jvmtiEvent event_type, bool enabled);

   // Setting callbacks changes computed enablement and must be done

   // at a safepoint otherwise a NULL callback could be attempted

   static void set_event_callbacks(JvmtiEnvBase *env,

                                   const jvmtiEventCallbacks* callbacks,

                                   jint size_of_callbacks);

   // Sets the callback function for a single extension event and enables

   // (or disables it).

   static void set_extension_event_callback(JvmtiEnvBase* env,

                                            jint extension_event_index,

                                            jvmtiExtensionEvent callback);

   static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);

   static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);

   static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);

   static void change_field_watch(jvmtiEvent event_type, bool added);

   static void thread_started(JavaThread *thread);

   static void thread_ended(JavaThread *thread);

   static void env_initialize(JvmtiEnvBase *env);

   static void env_dispose(JvmtiEnvBase *env);

   static void vm_start();

   static void vm_init();

   static void vm_death();

 };

 #endif // SHARE_VM_PRIMS_JVMTIEVENTCONTROLLER_HPP