1 /*
2 * Copyright (c) 2012, 2015, 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
25 #ifndef SHARE_VM_MEMORY_METASPACESHARED_HPP
26 #define SHARE_VM_MEMORY_METASPACESHARED_HPP
27
28 #include "classfile/compactHashtable.hpp"
29 #include "memory/allocation.hpp"
30 #include "memory/memRegion.hpp"
31 #include "memory/virtualspace.hpp"
32 #include "utilities/exceptions.hpp"
33 #include "utilities/macros.hpp"
34
35 #define DEFAULT_VTBL_LIST_SIZE (17) // number of entries in the shared space vtable list.
36 #define DEFAULT_VTBL_VIRTUALS_COUNT (200) // maximum number of virtual functions
37 // If virtual functions are added to Metadata,
38 // this number needs to be increased. Also,
39 // SharedMiscCodeSize will need to be increased.
40 // The following 2 sizes were based on
41 // MetaspaceShared::generate_vtable_methods()
42 #define DEFAULT_VTBL_METHOD_SIZE (16) // conservative size of the mov1 and jmp instructions
43 // for the x64 platform
44 #define DEFAULT_VTBL_COMMON_CODE_SIZE (1*K) // conservative size of the "common_code" for the x64 platform
45
46 #define DEFAULT_SHARED_READ_WRITE_SIZE (NOT_LP64(12*M) LP64_ONLY(16*M))
47 #define MIN_SHARED_READ_WRITE_SIZE (NOT_LP64(7*M) LP64_ONLY(12*M))
48
49 #define DEFAULT_SHARED_READ_ONLY_SIZE (NOT_LP64(12*M) LP64_ONLY(16*M))
50 #define MIN_SHARED_READ_ONLY_SIZE (NOT_LP64(8*M) LP64_ONLY(9*M))
51
52 // the MIN_SHARED_MISC_DATA_SIZE and MIN_SHARED_MISC_CODE_SIZE estimates are based on
53 // MetaspaceShared::generate_vtable_methods().
54 // The minimum size only accounts for the vtable methods. Any size less than the
55 // minimum required size would cause vm crash when allocating the vtable methods.
56 #define SHARED_MISC_SIZE_FOR(size) (DEFAULT_VTBL_VIRTUALS_COUNT*DEFAULT_VTBL_LIST_SIZE*size)
57
58 #define DEFAULT_SHARED_MISC_DATA_SIZE (NOT_LP64(2*M) LP64_ONLY(4*M))
59 #define MIN_SHARED_MISC_DATA_SIZE (SHARED_MISC_SIZE_FOR(sizeof(void*)))
60
61 #define DEFAULT_SHARED_MISC_CODE_SIZE (120*K)
62 #define MIN_SHARED_MISC_CODE_SIZE (SHARED_MISC_SIZE_FOR(sizeof(void*))+SHARED_MISC_SIZE_FOR(DEFAULT_VTBL_METHOD_SIZE)+DEFAULT_VTBL_COMMON_CODE_SIZE)
63
64 #define DEFAULT_COMBINED_SIZE (DEFAULT_SHARED_READ_WRITE_SIZE+DEFAULT_SHARED_READ_ONLY_SIZE+DEFAULT_SHARED_MISC_DATA_SIZE+DEFAULT_SHARED_MISC_CODE_SIZE)
65
66 // the max size is the MAX size (ie. 0x7FFFFFFF) - the total size of
67 // the other 3 sections - page size (to avoid overflow in case the final
68 // size will get aligned up on page size)
69 #define SHARED_PAGE ((size_t)os::vm_page_size())
70 #define MAX_SHARED_DELTA (0x7FFFFFFF)
71 #define MAX_SHARED_READ_WRITE_SIZE (MAX_SHARED_DELTA-(MIN_SHARED_READ_ONLY_SIZE+MIN_SHARED_MISC_DATA_SIZE+MIN_SHARED_MISC_CODE_SIZE)-SHARED_PAGE)
72 #define MAX_SHARED_READ_ONLY_SIZE (MAX_SHARED_DELTA-(MIN_SHARED_READ_WRITE_SIZE+MIN_SHARED_MISC_DATA_SIZE+MIN_SHARED_MISC_CODE_SIZE)-SHARED_PAGE)
73 #define MAX_SHARED_MISC_DATA_SIZE (MAX_SHARED_DELTA-(MIN_SHARED_READ_WRITE_SIZE+MIN_SHARED_READ_ONLY_SIZE+MIN_SHARED_MISC_CODE_SIZE)-SHARED_PAGE)
74 #define MAX_SHARED_MISC_CODE_SIZE (MAX_SHARED_DELTA-(MIN_SHARED_READ_WRITE_SIZE+MIN_SHARED_READ_ONLY_SIZE+MIN_SHARED_MISC_DATA_SIZE)-SHARED_PAGE)
75
76 #define LargeSharedArchiveSize (300*M)
77 #define HugeSharedArchiveSize (800*M)
78 #define ReadOnlyRegionPercentage 0.4
79 #define ReadWriteRegionPercentage 0.55
80 #define MiscDataRegionPercentage 0.03
81 #define MiscCodeRegionPercentage 0.02
82 #define LargeThresholdClassCount 5000
83 #define HugeThresholdClassCount 40000
84
85 #define SET_ESTIMATED_SIZE(type, region) \
86 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \
87 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size
88
89 class FileMapInfo;
90
91 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC {
92 public:
93 MetaspaceSharedStats() {
94 memset(this, 0, sizeof(*this));
95 }
96 CompactHashtableStats symbol;
97 CompactHashtableStats string;
98 };
99
100 // Class Data Sharing Support
101 class MetaspaceShared : AllStatic {
102
103 // CDS support
104 static ReservedSpace* _shared_rs;
105 static int _max_alignment;
106 static MetaspaceSharedStats _stats;
107 static bool _link_classes_made_progress;
108 static bool _check_classes_made_progress;
109 static bool _has_error_classes;
110 static bool _archive_loading_failed;
111 public:
112 enum {
113 vtbl_list_size = DEFAULT_VTBL_LIST_SIZE,
114 num_virtuals = DEFAULT_VTBL_VIRTUALS_COUNT,
115 vtbl_method_size = DEFAULT_VTBL_METHOD_SIZE,
116 vtbl_common_code_size = DEFAULT_VTBL_COMMON_CODE_SIZE
117 };
118
119 enum {
120 ro = 0, // read-only shared space in the heap
121 rw = 1, // read-write shared space in the heap
122 md = 2, // miscellaneous data for initializing tables, etc.
123 mc = 3, // miscellaneous code - vtable replacement.
124 max_strings = 2, // max number of string regions in string space
125 num_non_strings = 4, // number of non-string regions
126 first_string = num_non_strings, // index of first string region
127 n_regions = max_strings + num_non_strings // total number of regions
128 };
129
130 // Accessor functions to save shared space created for metadata, which has
131 // extra space allocated at the end for miscellaneous data and code.
132 static void set_max_alignment(int alignment) {
133 CDS_ONLY(_max_alignment = alignment);
134 }
135
136 static int max_alignment() {
137 CDS_ONLY(return _max_alignment);
138 NOT_CDS(return 0);
139 }
140
141 static void prepare_for_dumping() NOT_CDS_RETURN;
142 static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
143 static int preload_and_dump(const char * class_list_path,
144 GrowableArray<Klass*>* class_promote_order,
145 TRAPS) NOT_CDS_RETURN_(0);
146
147 static ReservedSpace* shared_rs() {
148 CDS_ONLY(return _shared_rs);
149 NOT_CDS(return NULL);
150 }
151
152 static void set_shared_rs(ReservedSpace* rs) {
153 CDS_ONLY(_shared_rs = rs;)
154 }
155
156 static void set_archive_loading_failed() {
157 _archive_loading_failed = true;
158 }
159 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
160 static void initialize_shared_spaces() NOT_CDS_RETURN;
161 static void fixup_shared_string_regions() NOT_CDS_RETURN;
162
163 // Return true if given address is in the mapped shared space.
164 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
165
166 static bool is_string_region(int idx) NOT_CDS_RETURN_(false);
167
168 static void generate_vtable_methods(void** vtbl_list,
169 void** vtable,
170 char** md_top, char* md_end,
171 char** mc_top, char* mc_end);
172 static void serialize(SerializeClosure* sc);
173
174 static MetaspaceSharedStats* stats() {
175 return &_stats;
176 }
177
178 // JVM/TI RedefineClasses() support:
179 // Remap the shared readonly space to shared readwrite, private if
180 // sharing is enabled. Simply returns true if sharing is not enabled
181 // or if the remapping has already been done by a prior call.
182 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
183
184 static void print_shared_spaces();
185
186 static bool try_link_class(InstanceKlass* ik, TRAPS);
187 static void link_one_shared_class(Klass* obj, TRAPS);
188 static void check_one_shared_class(Klass* obj);
189 static void link_and_cleanup_shared_classes(TRAPS);
190
191 static int count_class(const char* classlist_file);
192 static void estimate_regions_size() NOT_CDS_RETURN;
193 };
194 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP