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