Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/metaspaceShared.hpp @ 20304:a22acf6d7598
8048112: G1 Full GC needs to support the case when the very first region is not available
Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett.
Reviewed-by: brutisso
author | tschatzl |
---|---|
date | Mon, 21 Jul 2014 10:00:31 +0200 |
parents | fb19af007ffc |
children | 6e0cb14ce59b |
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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" class FileMapInfo; // Class Data Sharing Support class MetaspaceShared : AllStatic { // CDS support static ReservedSpace* _shared_rs; static int _max_alignment; 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 preload_and_dump(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 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(); }; #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP