1 /*
2 * Copyright (c) 2012, 2016, 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(6*M) LP64_ONLY(10*M))
47 #define MIN_SHARED_READ_WRITE_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M))
48
49 #define DEFAULT_SHARED_READ_ONLY_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M))
50 #define MIN_SHARED_READ_ONLY_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M))
51
52 // the MIN_SHARED_MISC_DATA_SIZE and MIN_SHARED_MISC_CODE_SIZE estimates are based on
53 // the sizes required for dumping the archive using the default classlist. The sizes
54 // are multiplied by 1.5 for a safety margin.
55
56 #define DEFAULT_SHARED_MISC_DATA_SIZE (NOT_LP64(2*M) LP64_ONLY(4*M))
57 #define MIN_SHARED_MISC_DATA_SIZE (NOT_LP64(1*M) LP64_ONLY(1200*K))
58
59 #define DEFAULT_SHARED_MISC_CODE_SIZE (120*K)
60 #define MIN_SHARED_MISC_CODE_SIZE (NOT_LP64(63*K) LP64_ONLY(69*K))
61 #define DEFAULT_COMBINED_SIZE (DEFAULT_SHARED_READ_WRITE_SIZE+DEFAULT_SHARED_READ_ONLY_SIZE+DEFAULT_SHARED_MISC_DATA_SIZE+DEFAULT_SHARED_MISC_CODE_SIZE)
62
63 // the max size is the MAX size (ie. 0x7FFFFFFF) - the total size of
64 // the other 3 sections - page size (to avoid overflow in case the final
65 // size will get aligned up on page size)
66 #define SHARED_PAGE ((size_t)os::vm_page_size())
67 #define MAX_SHARED_DELTA (0x7FFFFFFF)
68 #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)
69 #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)
70 #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)
71 #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)
72
73 #define LargeSharedArchiveSize (300*M)
74 #define HugeSharedArchiveSize (800*M)
75 #define ReadOnlyRegionPercentage 0.4
76 #define ReadWriteRegionPercentage 0.55
77 #define MiscDataRegionPercentage 0.03
78 #define MiscCodeRegionPercentage 0.02
79 #define LargeThresholdClassCount 5000
80 #define HugeThresholdClassCount 40000
81
82 #define SET_ESTIMATED_SIZE(type, region) \
83 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \
84 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size
85
86 class FileMapInfo;
87
88 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC {
89 public:
90 MetaspaceSharedStats() {
91 memset(this, 0, sizeof(*this));
92 }
93 CompactHashtableStats symbol;
94 CompactHashtableStats string;
95 };
96
97 class SharedMiscRegion VALUE_OBJ_CLASS_SPEC {
98 private:
99 VirtualSpace _vs;
100 char* _alloc_top;
101 SharedSpaceType _space_type;
102
103 public:
104 void initialize(ReservedSpace rs, size_t committed_byte_size, SharedSpaceType space_type);
105 VirtualSpace* virtual_space() {
106 return &_vs;
107 }
108 char* low() const {
109 return _vs.low();
110 }
111 char* alloc_top() const {
112 return _alloc_top;
113 }
114 char* alloc(size_t num_bytes) NOT_CDS_RETURN_(NULL);
115 };
116
117 // Class Data Sharing Support
118 class MetaspaceShared : AllStatic {
119
120 // CDS support
121 static ReservedSpace* _shared_rs;
122 static int _max_alignment;
123 static MetaspaceSharedStats _stats;
124 static bool _link_classes_made_progress;
125 static bool _check_classes_made_progress;
126 static bool _has_error_classes;
127 static bool _archive_loading_failed;
128 static bool _remapped_readwrite;
129 static address _cds_i2i_entry_code_buffers;
130 static size_t _cds_i2i_entry_code_buffers_size;
131
132 // Used only during dumping.
133 static SharedMiscRegion _md;
134 static SharedMiscRegion _mc;
135 public:
136 enum {
137 vtbl_list_size = DEFAULT_VTBL_LIST_SIZE,
138 num_virtuals = DEFAULT_VTBL_VIRTUALS_COUNT,
139 vtbl_method_size = DEFAULT_VTBL_METHOD_SIZE,
140 vtbl_common_code_size = DEFAULT_VTBL_COMMON_CODE_SIZE
141 };
142
143 enum {
144 ro = 0, // read-only shared space in the heap
145 rw = 1, // read-write shared space in the heap
146 md = 2, // miscellaneous data for initializing tables, etc.
147 mc = 3, // miscellaneous code - vtable replacement.
148 max_strings = 2, // max number of string regions in string space
149 num_non_strings = 4, // number of non-string regions
150 first_string = num_non_strings, // index of first string region
151 n_regions = max_strings + num_non_strings // total number of regions
152 };
153
154 // Accessor functions to save shared space created for metadata, which has
155 // extra space allocated at the end for miscellaneous data and code.
156 static void set_max_alignment(int alignment) {
157 CDS_ONLY(_max_alignment = alignment);
158 }
159
160 static int max_alignment() {
161 CDS_ONLY(return _max_alignment);
162 NOT_CDS(return 0);
163 }
164
165 static void prepare_for_dumping() NOT_CDS_RETURN;
166 static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
167 static int preload_and_dump(const char * class_list_path,
168 GrowableArray<Klass*>* class_promote_order,
169 TRAPS) NOT_CDS_RETURN_(0);
170
171 static ReservedSpace* shared_rs() {
172 CDS_ONLY(return _shared_rs);
173 NOT_CDS(return NULL);
174 }
175
176 static void initialize_shared_rs(ReservedSpace* rs) NOT_CDS_RETURN;
177
178 static void set_archive_loading_failed() {
179 _archive_loading_failed = true;
180 }
181 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
182 static void initialize_shared_spaces() NOT_CDS_RETURN;
183 static void fixup_shared_string_regions() NOT_CDS_RETURN;
184
185 // Return true if given address is in the mapped shared space.
186 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
187
188 // Return true if given address is in the shared region corresponding to the idx
189 static bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false);
190
191 static bool is_string_region(int idx) NOT_CDS_RETURN_(false);
192
193 static void generate_vtable_methods(void** vtbl_list,
194 void** vtable,
195 char** md_top, char* md_end,
196 char** mc_top, char* mc_end);
197 static void serialize(SerializeClosure* sc, GrowableArray<MemRegion> *string_space,
198 size_t* space_size);
199
200 static MetaspaceSharedStats* stats() {
201 return &_stats;
202 }
203
204 // JVM/TI RedefineClasses() support:
205 // Remap the shared readonly space to shared readwrite, private if
206 // sharing is enabled. Simply returns true if sharing is not enabled
207 // or if the remapping has already been done by a prior call.
208 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
209 static bool remapped_readwrite() {
210 CDS_ONLY(return _remapped_readwrite);
211 NOT_CDS(return false);
212 }
213
214 static void print_shared_spaces();
215
216 static bool try_link_class(InstanceKlass* ik, TRAPS);
217 static void link_one_shared_class(Klass* obj, TRAPS);
218 static void check_one_shared_class(Klass* obj);
219 static void check_shared_class_loader_type(Klass* obj);
220 static void link_and_cleanup_shared_classes(TRAPS);
221
222 static int count_class(const char* classlist_file);
223 static void estimate_regions_size() NOT_CDS_RETURN;
224
225 // Allocate a block of memory from the "mc" or "md" regions.
226 static char* misc_code_space_alloc(size_t num_bytes) { return _mc.alloc(num_bytes); }
227 static char* misc_data_space_alloc(size_t num_bytes) { return _md.alloc(num_bytes); }
228
229 static address cds_i2i_entry_code_buffers(size_t total_size);
230
231 static address cds_i2i_entry_code_buffers() {
232 return _cds_i2i_entry_code_buffers;
233 }
234 static size_t cds_i2i_entry_code_buffers_size() {
235 return _cds_i2i_entry_code_buffers_size;
236 }
237
238 static SharedMiscRegion* misc_code_region() {
239 assert(DumpSharedSpaces, "used during dumping only");
240 return &_mc;
241 }
242 static SharedMiscRegion* misc_data_region() {
243 assert(DumpSharedSpaces, "used during dumping only");
244 return &_md;
245 }
246 };
247 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP