bbe6f51f81
Cleaned up CDS to be more configurable, maintainable and extensible Reviewed-by: dholmes, coleenp, acorn, mchung
117 lines
4.3 KiB
C++
117 lines
4.3 KiB
C++
/*
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* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP
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#define SHARE_VM_MEMORY_METASPACE_SHARED_HPP
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#include "memory/allocation.hpp"
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#include "memory/memRegion.hpp"
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#include "runtime/virtualspace.hpp"
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#include "utilities/exceptions.hpp"
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#include "utilities/macros.hpp"
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class FileMapInfo;
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// Class Data Sharing Support
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class MetaspaceShared : AllStatic {
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// CDS support
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static ReservedSpace* _shared_rs;
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static int _max_alignment;
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static bool _link_classes_made_progress;
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static bool _check_classes_made_progress;
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static bool _has_error_classes;
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static bool _archive_loading_failed;
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public:
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enum {
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vtbl_list_size = 17, // number of entries in the shared space vtable list.
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num_virtuals = 200 // maximum number of virtual functions
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// If virtual functions are added to Metadata,
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// this number needs to be increased. Also,
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// SharedMiscCodeSize will need to be increased.
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};
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enum {
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ro = 0, // read-only shared space in the heap
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rw = 1, // read-write shared space in the heap
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md = 2, // miscellaneous data for initializing tables, etc.
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mc = 3, // miscellaneous code - vtable replacement.
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n_regions = 4
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};
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// Accessor functions to save shared space created for metadata, which has
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// extra space allocated at the end for miscellaneous data and code.
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static void set_max_alignment(int alignment) {
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CDS_ONLY(_max_alignment = alignment);
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}
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static int max_alignment() {
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CDS_ONLY(return _max_alignment);
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NOT_CDS(return 0);
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}
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static void prepare_for_dumping() NOT_CDS_RETURN;
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static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
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static int preload_and_dump(const char * class_list_path,
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GrowableArray<Klass*>* class_promote_order,
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TRAPS) NOT_CDS_RETURN;
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static ReservedSpace* shared_rs() {
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CDS_ONLY(return _shared_rs);
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NOT_CDS(return NULL);
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}
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static void set_shared_rs(ReservedSpace* rs) {
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CDS_ONLY(_shared_rs = rs;)
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}
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static void set_archive_loading_failed() {
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_archive_loading_failed = true;
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}
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static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
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static void initialize_shared_spaces() NOT_CDS_RETURN;
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// Return true if given address is in the mapped shared space.
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static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
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static void generate_vtable_methods(void** vtbl_list,
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void** vtable,
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char** md_top, char* md_end,
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char** mc_top, char* mc_end);
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static void serialize(SerializeClosure* sc);
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// JVM/TI RedefineClasses() support:
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// Remap the shared readonly space to shared readwrite, private if
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// sharing is enabled. Simply returns true if sharing is not enabled
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// or if the remapping has already been done by a prior call.
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static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
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static void print_shared_spaces();
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static bool try_link_class(InstanceKlass* ik, TRAPS);
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static void link_one_shared_class(Klass* obj, TRAPS);
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static void check_one_shared_class(Klass* obj);
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static void link_and_cleanup_shared_classes(TRAPS);
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};
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#endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP
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