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 #define LargeSharedArchiveSize (300*M)
34 #define HugeSharedArchiveSize (800*M)
35 #define ReadOnlyRegionPercentage 0.39
36 #define ReadWriteRegionPercentage 0.50
37 #define MiscDataRegionPercentage 0.09
38 #define MiscCodeRegionPercentage 0.02
39 #define LargeThresholdClassCount 5000
40 #define HugeThresholdClassCount 40000
41
42 #define SET_ESTIMATED_SIZE(type, region) \
43 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \
44 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size
45
46 class FileMapInfo;
47
48 // Class Data Sharing Support
49 class MetaspaceShared : AllStatic {
50
51 // CDS support
52 static ReservedSpace* _shared_rs;
53 static int _max_alignment;
54 static bool _link_classes_made_progress;
55 static bool _check_classes_made_progress;
56 static bool _has_error_classes;
57 static bool _archive_loading_failed;
58 public:
59 enum {
60 vtbl_list_size = 17, // number of entries in the shared space vtable list.
61 num_virtuals = 200, // maximum number of virtual functions
62 // If virtual functions are added to Metadata,
63 // this number needs to be increased. Also,
64 // SharedMiscCodeSize will need to be increased.
65 // The following 2 sizes were based on
66 // MetaspaceShared::generate_vtable_methods()
67 vtbl_method_size = 16, // conservative size of the mov1 and jmp instructions
68 // for the x64 platform
69 vtbl_common_code_size = (1*K) // conservative size of the "common_code" for the x64 platform
70 };
71
72 enum {
73 ro = 0, // read-only shared space in the heap
74 rw = 1, // read-write shared space in the heap
75 md = 2, // miscellaneous data for initializing tables, etc.
76 mc = 3, // miscellaneous code - vtable replacement.
77 n_regions = 4
78 };
79
80 // Accessor functions to save shared space created for metadata, which has
81 // extra space allocated at the end for miscellaneous data and code.
82 static void set_max_alignment(int alignment) {
83 CDS_ONLY(_max_alignment = alignment);
84 }
85
86 static int max_alignment() {
87 CDS_ONLY(return _max_alignment);
88 NOT_CDS(return 0);
89 }
90
91 static void prepare_for_dumping() NOT_CDS_RETURN;
92 static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
93 static int preload_and_dump(const char * class_list_path,
94 GrowableArray<Klass*>* class_promote_order,
95 TRAPS) NOT_CDS_RETURN;
96
97 static ReservedSpace* shared_rs() {
98 CDS_ONLY(return _shared_rs);
99 NOT_CDS(return NULL);
100 }
101
102 static void set_shared_rs(ReservedSpace* rs) {
103 CDS_ONLY(_shared_rs = rs;)
104 }
105
106 static void set_archive_loading_failed() {
107 _archive_loading_failed = true;
108 }
109 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
110 static void initialize_shared_spaces() NOT_CDS_RETURN;
111
112 // Return true if given address is in the mapped shared space.
113 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
114
115 static void generate_vtable_methods(void** vtbl_list,
116 void** vtable,
117 char** md_top, char* md_end,
118 char** mc_top, char* mc_end);
119 static void serialize(SerializeClosure* sc);
120
121 // JVM/TI RedefineClasses() support:
122 // Remap the shared readonly space to shared readwrite, private if
123 // sharing is enabled. Simply returns true if sharing is not enabled
124 // or if the remapping has already been done by a prior call.
125 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
126
127 static void print_shared_spaces();
128
129 static bool try_link_class(InstanceKlass* ik, TRAPS);
130 static void link_one_shared_class(Klass* obj, TRAPS);
131 static void check_one_shared_class(Klass* obj);
132 static void link_and_cleanup_shared_classes(TRAPS);
133
134 static int count_class(const char* classlist_file);
135 static void estimate_regions_size() NOT_CDS_RETURN;
136 };
137 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP