/*

 * Copyright (c) 1999, 2015, 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_JVMTIUTIL_HPP

#define SHARE_VM_PRIMS_JVMTIUTIL_HPP

#include "jvmtifiles/jvmti.h"

#include "memory/resourceArea.hpp"

#include "prims/jvmtiEventController.hpp"

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

//

// class JvmtiUtil

//

// class for miscellaneous jvmti utility static methods

//

class JvmtiUtil : AllStatic {

  static ResourceArea* _single_threaded_resource_area;

  static const char* _error_names[];

  static const bool  _event_threaded[];

public:

  static ResourceArea* single_threaded_resource_area();

  static const char* error_name(int num)    { return _error_names[num]; }    // To Do: add range checking

  static const bool has_event_capability(jvmtiEvent event_type, const jvmtiCapabilities* capabilities_ptr);

  static const bool  event_threaded(int num) {

    if (num >= JVMTI_MIN_EVENT_TYPE_VAL && num <= JVMTI_MAX_EVENT_TYPE_VAL) {

      return _event_threaded[num];

    }

    if (num >= EXT_MIN_EVENT_TYPE_VAL && num <= EXT_MAX_EVENT_TYPE_VAL) {

      return false;

    }

    ShouldNotReachHere();

    return false;

  }

};

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

//

// class SafeResourceMark

//

// ResourceMarks that work before threads exist

//

class SafeResourceMark : public ResourceMark {

  ResourceArea* safe_resource_area() {

    Thread* thread;

    if (Threads::number_of_threads() == 0) {

      return JvmtiUtil::single_threaded_resource_area();

    }

    thread = Thread::current_or_null();

    if (thread == NULL) {

      return JvmtiUtil::single_threaded_resource_area();

    }

    return thread->resource_area();

  }

 public:

  SafeResourceMark() : ResourceMark(safe_resource_area()) {}

};

#endif // SHARE_VM_PRIMS_JVMTIUTIL_HPP