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src/share/vm/memory/metaspaceShared.hpp@710a3c8b516e (annotated)
src/share/vm/memory/metaspaceShared.hpp
Tue, 08 Aug 2017 15:57:29 +0800
- author
- aoqi
- date
- Tue, 08 Aug 2017 15:57:29 +0800
- changeset 6876
- 710a3c8b516e
- parent 4165
- fb19af007ffc
- parent 0
- f90c822e73f8
- child 7535
- 7ae4e26cb1e0
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- -rw-r--r--
merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | #ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP |
| aoqi@0 | 25 | #define SHARE_VM_MEMORY_METASPACE_SHARED_HPP |
| aoqi@0 | 26 | |
| aoqi@0 | 27 | #include "memory/allocation.hpp" |
| aoqi@0 | 28 | #include "memory/memRegion.hpp" |
| aoqi@0 | 29 | #include "runtime/virtualspace.hpp" |
| aoqi@0 | 30 | #include "utilities/exceptions.hpp" |
| aoqi@0 | 31 | #include "utilities/macros.hpp" |
| aoqi@0 | 32 | |
| aoqi@0 | 33 | class FileMapInfo; |
| aoqi@0 | 34 | |
| aoqi@0 | 35 | // Class Data Sharing Support |
| aoqi@0 | 36 | class MetaspaceShared : AllStatic { |
| aoqi@0 | 37 | |
| aoqi@0 | 38 | // CDS support |
| aoqi@0 | 39 | static ReservedSpace* _shared_rs; |
| aoqi@0 | 40 | static int _max_alignment; |
| aoqi@0 | 41 | |
| aoqi@0 | 42 | public: |
| aoqi@0 | 43 | enum { |
| aoqi@0 | 44 | vtbl_list_size = 17, // number of entries in the shared space vtable list. |
| aoqi@0 | 45 | num_virtuals = 200 // maximum number of virtual functions |
| aoqi@0 | 46 | // If virtual functions are added to Metadata, |
| aoqi@0 | 47 | // this number needs to be increased. Also, |
| aoqi@0 | 48 | // SharedMiscCodeSize will need to be increased. |
| aoqi@0 | 49 | }; |
| aoqi@0 | 50 | |
| aoqi@0 | 51 | enum { |
| aoqi@0 | 52 | ro = 0, // read-only shared space in the heap |
| aoqi@0 | 53 | rw = 1, // read-write shared space in the heap |
| aoqi@0 | 54 | md = 2, // miscellaneous data for initializing tables, etc. |
| aoqi@0 | 55 | mc = 3, // miscellaneous code - vtable replacement. |
| aoqi@0 | 56 | n_regions = 4 |
| aoqi@0 | 57 | }; |
| aoqi@0 | 58 | |
| aoqi@0 | 59 | // Accessor functions to save shared space created for metadata, which has |
| aoqi@0 | 60 | // extra space allocated at the end for miscellaneous data and code. |
| aoqi@0 | 61 | static void set_max_alignment(int alignment) { |
| aoqi@0 | 62 | CDS_ONLY(_max_alignment = alignment); |
| aoqi@0 | 63 | } |
| aoqi@0 | 64 | |
| aoqi@0 | 65 | static int max_alignment() { |
| aoqi@0 | 66 | CDS_ONLY(return _max_alignment); |
| aoqi@0 | 67 | NOT_CDS(return 0); |
| aoqi@0 | 68 | } |
| aoqi@0 | 69 | |
| aoqi@0 | 70 | static void preload_and_dump(TRAPS) NOT_CDS_RETURN; |
| aoqi@0 | 71 | |
| aoqi@0 | 72 | static ReservedSpace* shared_rs() { |
| aoqi@0 | 73 | CDS_ONLY(return _shared_rs); |
| aoqi@0 | 74 | NOT_CDS(return NULL); |
| aoqi@0 | 75 | } |
| aoqi@0 | 76 | |
| aoqi@0 | 77 | static void set_shared_rs(ReservedSpace* rs) { |
| aoqi@0 | 78 | CDS_ONLY(_shared_rs = rs;) |
| aoqi@0 | 79 | } |
| aoqi@0 | 80 | |
| aoqi@0 | 81 | static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); |
| aoqi@0 | 82 | static void initialize_shared_spaces() NOT_CDS_RETURN; |
| aoqi@0 | 83 | |
| aoqi@0 | 84 | // Return true if given address is in the mapped shared space. |
| aoqi@0 | 85 | static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); |
| aoqi@0 | 86 | |
| aoqi@0 | 87 | static void generate_vtable_methods(void** vtbl_list, |
| aoqi@0 | 88 | void** vtable, |
| aoqi@0 | 89 | char** md_top, char* md_end, |
| aoqi@0 | 90 | char** mc_top, char* mc_end); |
| aoqi@0 | 91 | static void serialize(SerializeClosure* sc); |
| aoqi@0 | 92 | |
| aoqi@0 | 93 | // JVM/TI RedefineClasses() support: |
| aoqi@0 | 94 | // Remap the shared readonly space to shared readwrite, private if |
| aoqi@0 | 95 | // sharing is enabled. Simply returns true if sharing is not enabled |
| aoqi@0 | 96 | // or if the remapping has already been done by a prior call. |
| aoqi@0 | 97 | static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); |
| aoqi@0 | 98 | |
| aoqi@0 | 99 | static void print_shared_spaces(); |
| aoqi@0 | 100 | }; |
| aoqi@0 | 101 | #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP |
