coleenp@4037: /*
coleenp@4037:  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
coleenp@4037:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
coleenp@4037:  *
coleenp@4037:  * This code is free software; you can redistribute it and/or modify it
coleenp@4037:  * under the terms of the GNU General Public License version 2 only, as
coleenp@4037:  * published by the Free Software Foundation.
coleenp@4037:  *
coleenp@4037:  * This code is distributed in the hope that it will be useful, but WITHOUT
coleenp@4037:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
coleenp@4037:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
coleenp@4037:  * version 2 for more details (a copy is included in the LICENSE file that
coleenp@4037:  * accompanied this code).
coleenp@4037:  *
coleenp@4037:  * You should have received a copy of the GNU General Public License version
coleenp@4037:  * 2 along with this work; if not, write to the Free Software Foundation,
coleenp@4037:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
coleenp@4037:  *
coleenp@4037:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
coleenp@4037:  * or visit www.oracle.com if you need additional information or have any
coleenp@4037:  * questions.
coleenp@4037:  *
coleenp@4037:  */
coleenp@4037: #ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP
coleenp@4037: #define SHARE_VM_MEMORY_METASPACE_SHARED_HPP
coleenp@4037: 
coleenp@4037: #include "memory/allocation.hpp"
coleenp@4037: #include "memory/memRegion.hpp"
coleenp@4037: #include "runtime/virtualspace.hpp"
coleenp@4037: #include "utilities/exceptions.hpp"
coleenp@4037: #include "utilities/macros.hpp"
coleenp@4037: 
coleenp@4037: class FileMapInfo;
coleenp@4037: 
coleenp@4037: // Class Data Sharing Support
coleenp@4037: class MetaspaceShared : AllStatic {
coleenp@4037: 
coleenp@4037:   // CDS support
coleenp@4037:   static ReservedSpace* _shared_rs;
coleenp@4037:   static int _max_alignment;
coleenp@4037: 
coleenp@4037:  public:
coleenp@4037:   enum {
coleenp@4037:     vtbl_list_size = 17, // number of entries in the shared space vtable list.
coleenp@4037:     num_virtuals = 200   // maximum number of virtual functions
coleenp@4037:                          // If virtual functions are added to Metadata,
coleenp@4037:                          // this number needs to be increased.  Also,
coleenp@4037:                          // SharedMiscCodeSize will need to be increased.
coleenp@4037:   };
coleenp@4037: 
coleenp@4037:   enum {
coleenp@4037:     ro = 0,  // read-only shared space in the heap
coleenp@4037:     rw = 1,  // read-write shared space in the heap
coleenp@4037:     md = 2,  // miscellaneous data for initializing tables, etc.
coleenp@4037:     mc = 3,  // miscellaneous code - vtable replacement.
coleenp@4037:     n_regions = 4
coleenp@4037:   };
coleenp@4037: 
jprovino@4165:   // Accessor functions to save shared space created for metadata, which has
jprovino@4165:   // extra space allocated at the end for miscellaneous data and code.
jprovino@4165:   static void set_max_alignment(int alignment) {
jprovino@4165:     CDS_ONLY(_max_alignment = alignment);
jprovino@4165:   }
coleenp@4037: 
jprovino@4165:   static int max_alignment() {
jprovino@4165:     CDS_ONLY(return _max_alignment);
jprovino@4165:     NOT_CDS(return 0);
jprovino@4165:   }
coleenp@4037: 
jprovino@4165:   static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
jprovino@4165: 
jprovino@4165:   static ReservedSpace* shared_rs() {
jprovino@4165:     CDS_ONLY(return _shared_rs);
jprovino@4165:     NOT_CDS(return NULL);
jprovino@4165:   }
jprovino@4165: 
jprovino@4165:   static void set_shared_rs(ReservedSpace* rs) {
jprovino@4165:     CDS_ONLY(_shared_rs = rs;)
jprovino@4165:   }
jprovino@4165: 
jprovino@4165:   static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
jprovino@4165:   static void initialize_shared_spaces() NOT_CDS_RETURN;
coleenp@4037: 
coleenp@4037:   // Return true if given address is in the mapped shared space.
jprovino@4165:   static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
coleenp@4037: 
coleenp@4037:   static void generate_vtable_methods(void** vtbl_list,
coleenp@4037:                                       void** vtable,
coleenp@4037:                                       char** md_top, char* md_end,
coleenp@4037:                                       char** mc_top, char* mc_end);
coleenp@4037:   static void serialize(SerializeClosure* sc);
coleenp@4037: 
coleenp@4037:   // JVM/TI RedefineClasses() support:
coleenp@4037:   // Remap the shared readonly space to shared readwrite, private if
coleenp@4037:   // sharing is enabled. Simply returns true if sharing is not enabled
coleenp@4037:   // or if the remapping has already been done by a prior call.
jprovino@4165:   static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
coleenp@4037: 
coleenp@4037:   static void print_shared_spaces();
coleenp@4037: };
coleenp@4037: #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP