jdk8-mips64-public/hotspot: src/share/vm/memory/metaspaceShared.hpp@6e0cb14ce59b (annotated)

src/share/vm/memory/metaspaceShared.hpp@6e0cb14ce59b (annotated)

src/share/vm/memory/metaspaceShared.hpp

Thu, 21 Aug 2014 13:57:51 -0700

author: iklam
date: Thu, 21 Aug 2014 13:57:51 -0700
changeset 7089: 6e0cb14ce59b
parent 4165: fb19af007ffc
child 7103: 622c6e0ad4d6
permissions: -rw-r--r--

8046070: Class Data Sharing clean up and refactoring
Summary: Cleaned up CDS to be more configurable, maintainable and extensible
Reviewed-by: dholmes, coleenp, acorn, mchung

 /*
  * 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"
 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);
 };
 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP

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src/share/vm/memory/metaspaceShared.hpp@6e0cb14ce59b (annotated)

src/share/vm/memory/metaspaceShared.hpp