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 /*

  * Copyright (c) 1997, 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

  * questions.

  *

  */

 #ifndef SHARE_VM_RUNTIME_JAVA_HPP

 #define SHARE_VM_RUNTIME_JAVA_HPP

 #include "runtime/os.hpp"

 // Register function to be called by before_exit

 extern "C" { void register_on_exit_function(void (*func)(void)) ;}

 // Execute code before all handles are released and thread is killed; prologue to vm_exit

 extern void before_exit(JavaThread * thread);

 // Forced VM exit (i.e, internal error or JVM_Exit)

 extern void vm_exit(int code);

 // Wrapper for ::exit()

 extern void vm_direct_exit(int code);

 // Shutdown the VM but do not exit the process

 extern void vm_shutdown();

 // Shutdown the VM and abort the process

 extern void vm_abort(bool dump_core=true);

 // Trigger any necessary notification of the VM being shutdown

 extern void notify_vm_shutdown();

 // VM exit if error occurs during initialization of VM

 extern void vm_exit_during_initialization(Handle exception);

 extern void vm_exit_during_initialization(symbolHandle exception_name, const char* message);

 extern void vm_exit_during_initialization(const char* error, const char* message = NULL);

 extern void vm_shutdown_during_initialization(const char* error, const char* message = NULL);

 /**

  * Discovering the JDK_Version during initialization is tricky when the

  * running JDK is less than JDK6.  For JDK6 and greater, a "GetVersion"

  * function exists in libjava.so and we simply call it during the

  * 'initialize()' call to find the version.  For JDKs with version < 6, no

  * such call exists and we have to probe the JDK in order to determine

  * the exact version.  This probing cannot happen during late in

  * the VM initialization process so there's a period of time during

  * initialization when we don't know anything about the JDK version other than

  * that it less than version 6.  This is the "partially initialized" time,

  * when we can answer only certain version queries (such as, is the JDK

  * version greater than 5?  Answer: no).  Once the JDK probing occurs, we

  * know the version and are considered fully initialized.

  */

 class JDK_Version VALUE_OBJ_CLASS_SPEC {

   friend class VMStructs;

   friend class Universe;

   friend void JDK_Version_init();

  private:

   static JDK_Version _current;

   // In this class, we promote the minor version of release to be the

   // major version for releases >= 5 in anticipation of the JDK doing the

   // same thing.  For example, we represent "1.5.0" as major version 5 (we

   // drop the leading 1 and use 5 as the 'major').

   uint8_t _major;

   uint8_t _minor;

   uint8_t _micro;

   uint8_t _update;

   uint8_t _special;

   uint8_t _build;

   // If partially initialized, the above fields are invalid and we know

   // that we're less than major version 6.

   bool _partially_initialized;

   bool _thread_park_blocker;

   bool is_valid() const {

     return (_major != 0 || _partially_initialized);

   }

   // initializes or partially initializes the _current static field

   static void initialize();

   // Completes initialization for a pre-JDK6 version.

   static void fully_initialize(uint8_t major, uint8_t minor = 0,

                                uint8_t micro = 0, uint8_t update = 0);

  public:

   // Returns true if the the current version has only been partially initialized

   static bool is_partially_initialized() {

     return _current._partially_initialized;

   }

   JDK_Version() : _major(0), _minor(0), _micro(0), _update(0),

                   _special(0), _build(0), _partially_initialized(false),

                   _thread_park_blocker(false) {}

   JDK_Version(uint8_t major, uint8_t minor = 0, uint8_t micro = 0,

               uint8_t update = 0, uint8_t special = 0, uint8_t build = 0,

               bool thread_park_blocker = false) :

       _major(major), _minor(minor), _micro(micro), _update(update),

       _special(special), _build(build), _partially_initialized(false),

       _thread_park_blocker(thread_park_blocker) {}

   // Returns the current running JDK version

   static JDK_Version current() { return _current; }

   // Factory methods for convenience

   static JDK_Version jdk(uint8_t m) {

     return JDK_Version(m);

   }

   static JDK_Version jdk_update(uint8_t major, uint8_t update_number) {

     return JDK_Version(major, 0, 0, update_number);

   }

   uint8_t major_version() const          { return _major; }

   uint8_t minor_version() const          { return _minor; }

   uint8_t micro_version() const          { return _micro; }

   uint8_t update_version() const         { return _update; }

   uint8_t special_update_version() const { return _special; }

   uint8_t build_number() const           { return _build; }

   bool supports_thread_park_blocker() const {

     return _thread_park_blocker;

   }

   // Performs a full ordering comparison using all fields (update, build, etc.)

   int compare(const JDK_Version& other) const;

   /**

    * Performs comparison using only the major version, returning negative

    * if the major version of 'this' is less than the parameter, 0 if it is

    * equal, and a positive value if it is greater.

    */

   int compare_major(int version) const {

     if (_partially_initialized) {

       if (version >= 6) {

         return -1;

       } else {

         assert(false, "Can't make this comparison during init time");

         return -1; // conservative

       }

     } else {

       return major_version() - version;

     }

   }

   void to_string(char* buffer, size_t buflen) const;

   // Convenience methods for queries on the current major/minor version

   static bool is_jdk12x_version() {

     return current().compare_major(2) == 0;

   }

   static bool is_jdk13x_version() {

     return current().compare_major(3) == 0;

   }

   static bool is_jdk14x_version() {

     return current().compare_major(4) == 0;

   }

   static bool is_jdk15x_version() {

     return current().compare_major(5) == 0;

   }

   static bool is_jdk16x_version() {

     return current().compare_major(6) == 0;

   }

   static bool is_jdk17x_version() {

     return current().compare_major(7) == 0;

   }

   static bool is_gte_jdk13x_version() {

     return current().compare_major(3) >= 0;

   }

   static bool is_gte_jdk14x_version() {

     return current().compare_major(4) >= 0;

   }

   static bool is_gte_jdk15x_version() {

     return current().compare_major(5) >= 0;

   }

   static bool is_gte_jdk16x_version() {

     return current().compare_major(6) >= 0;

   }

   static bool is_gte_jdk17x_version() {

     return current().compare_major(7) >= 0;

   }

 };

 #endif // SHARE_VM_RUNTIME_JAVA_HPP