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 /*

  * Copyright (c) 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_MEMORY_METASPACE_SHARED_HPP

 #define SHARE_VM_MEMORY_METASPACE_SHARED_HPP

 #include "memory/allocation.hpp"

 #include "memory/memRegion.hpp"

 #include "runtime/virtualspace.hpp"

 #include "utilities/exceptions.hpp"

 #include "utilities/macros.hpp"

 #define LargeSharedArchiveSize    (300*M)

 #define HugeSharedArchiveSize     (800*M)

 #define ReadOnlyRegionPercentage  0.4

 #define ReadWriteRegionPercentage 0.55

 #define MiscDataRegionPercentage  0.03

 #define MiscCodeRegionPercentage  0.02

 #define LargeThresholdClassCount  5000

 #define HugeThresholdClassCount   40000

 #define SET_ESTIMATED_SIZE(type, region)                              \

   Shared ##region## Size  = FLAG_IS_DEFAULT(Shared ##region## Size) ? \

     (type ## SharedArchiveSize *  region ## RegionPercentage) : Shared ## region ## Size

 class FileMapInfo;

 // Class Data Sharing Support

 class MetaspaceShared : AllStatic {

   // CDS support

   static ReservedSpace* _shared_rs;

   static int _max_alignment;

   static bool _link_classes_made_progress;

   static bool _check_classes_made_progress;

   static bool _has_error_classes;

   static bool _archive_loading_failed;

  public:

   enum {

     vtbl_list_size = 17, // number of entries in the shared space vtable list.

     num_virtuals = 200   // maximum number of virtual functions

                          // If virtual functions are added to Metadata,

                          // this number needs to be increased.  Also,

                          // SharedMiscCodeSize will need to be increased.

   };

   enum {

     ro = 0,  // read-only shared space in the heap

     rw = 1,  // read-write shared space in the heap

     md = 2,  // miscellaneous data for initializing tables, etc.

     mc = 3,  // miscellaneous code - vtable replacement.

     n_regions = 4

   };

   // Accessor functions to save shared space created for metadata, which has

   // extra space allocated at the end for miscellaneous data and code.

   static void set_max_alignment(int alignment) {

     CDS_ONLY(_max_alignment = alignment);

   }

   static int max_alignment() {

     CDS_ONLY(return _max_alignment);

     NOT_CDS(return 0);

   }

   static void prepare_for_dumping() NOT_CDS_RETURN;

   static void preload_and_dump(TRAPS) NOT_CDS_RETURN;

   static int preload_and_dump(const char * class_list_path,

                               GrowableArray<Klass*>* class_promote_order,

                               TRAPS) NOT_CDS_RETURN;

   static ReservedSpace* shared_rs() {

     CDS_ONLY(return _shared_rs);

     NOT_CDS(return NULL);

   }

   static void set_shared_rs(ReservedSpace* rs) {

     CDS_ONLY(_shared_rs = rs;)

   }

   static void set_archive_loading_failed() {

     _archive_loading_failed = true;

   }

   static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);

   static void initialize_shared_spaces() NOT_CDS_RETURN;

   // Return true if given address is in the mapped shared space.

   static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);

   static void generate_vtable_methods(void** vtbl_list,

                                       void** vtable,

                                       char** md_top, char* md_end,

                                       char** mc_top, char* mc_end);

   static void serialize(SerializeClosure* sc);

   // JVM/TI RedefineClasses() support:

   // Remap the shared readonly space to shared readwrite, private if

   // sharing is enabled. Simply returns true if sharing is not enabled

   // or if the remapping has already been done by a prior call.

   static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);

   static void print_shared_spaces();

   static bool try_link_class(InstanceKlass* ik, TRAPS);

   static void link_one_shared_class(Klass* obj, TRAPS);

   static void check_one_shared_class(Klass* obj);

   static void link_and_cleanup_shared_classes(TRAPS);

   static int count_class(const char* classlist_file);

   static void estimate_regions_size() NOT_CDS_RETURN;

 };

 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP