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 LargeSharedArchiveSize (300*M)
36 #define HugeSharedArchiveSize (800*M)
37 #define ReadOnlyRegionPercentage 0.4
38 #define ReadWriteRegionPercentage 0.55
39 #define MiscDataRegionPercentage 0.03
40 #define MiscCodeRegionPercentage 0.02
41 #define LargeThresholdClassCount 5000
42 #define HugeThresholdClassCount 40000
43
44 #define SET_ESTIMATED_SIZE(type, region) \
45 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \
46 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size
47
48 class FileMapInfo;
49
50 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC {
51 public:
52 MetaspaceSharedStats() {
53 memset(this, 0, sizeof(*this));
54 }
55 CompactHashtableStats symbol;
56 CompactHashtableStats string;
57 };
58
59 // Class Data Sharing Support
60 class MetaspaceShared : AllStatic {
61
62 // CDS support
63 static ReservedSpace* _shared_rs;
64 static int _max_alignment;
65 static MetaspaceSharedStats _stats;
66 static bool _link_classes_made_progress;
67 static bool _check_classes_made_progress;
68 static bool _has_error_classes;
69 static bool _archive_loading_failed;
70 public:
71 enum {
72 vtbl_list_size = 17, // number of entries in the shared space vtable list.
73 num_virtuals = 200, // maximum number of virtual functions
74 // If virtual functions are added to Metadata,
75 // this number needs to be increased. Also,
76 // SharedMiscCodeSize will need to be increased.
77 // The following 2 sizes were based on
78 // MetaspaceShared::generate_vtable_methods()
79 vtbl_method_size = 16, // conservative size of the mov1 and jmp instructions
80 // for the x64 platform
81 vtbl_common_code_size = (1*K) // conservative size of the "common_code" for the x64 platform
82 };
83
84 enum {
85 min_ro_size = NOT_LP64(8*M) LP64_ONLY(9*M), // minimum ro and rw regions sizes based on dumping
86 min_rw_size = NOT_LP64(7*M) LP64_ONLY(12*M) // of a shared archive using the default classlist
87 };
88
89 enum {
90 ro = 0, // read-only shared space in the heap
91 rw = 1, // read-write shared space in the heap
92 md = 2, // miscellaneous data for initializing tables, etc.
93 mc = 3, // miscellaneous code - vtable replacement.
94 max_strings = 2, // max number of string regions in string space
95 num_non_strings = 4, // number of non-string regions
96 first_string = num_non_strings, // index of first string region
97 n_regions = max_strings + num_non_strings // total number of regions
98 };
99
100 // Accessor functions to save shared space created for metadata, which has
101 // extra space allocated at the end for miscellaneous data and code.
102 static void set_max_alignment(int alignment) {
103 CDS_ONLY(_max_alignment = alignment);
104 }
105
106 static int max_alignment() {
107 CDS_ONLY(return _max_alignment);
108 NOT_CDS(return 0);
109 }
110
111 static void prepare_for_dumping() NOT_CDS_RETURN;
112 static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
113 static int preload_and_dump(const char * class_list_path,
114 GrowableArray<Klass*>* class_promote_order,
115 TRAPS) NOT_CDS_RETURN_(0);
116
117 static ReservedSpace* shared_rs() {
118 CDS_ONLY(return _shared_rs);
119 NOT_CDS(return NULL);
120 }
121
122 static void set_shared_rs(ReservedSpace* rs) {
123 CDS_ONLY(_shared_rs = rs;)
124 }
125
126 static void set_archive_loading_failed() {
127 _archive_loading_failed = true;
128 }
129 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
130 static void initialize_shared_spaces() NOT_CDS_RETURN;
131 static void fixup_shared_string_regions() NOT_CDS_RETURN;
132
133 // Return true if given address is in the mapped shared space.
134 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
135
136 static bool is_string_region(int idx) NOT_CDS_RETURN_(false);
137
138 static void generate_vtable_methods(void** vtbl_list,
139 void** vtable,
140 char** md_top, char* md_end,
141 char** mc_top, char* mc_end);
142 static void serialize(SerializeClosure* sc);
143
144 static MetaspaceSharedStats* stats() {
145 return &_stats;
146 }
147
148 // JVM/TI RedefineClasses() support:
149 // Remap the shared readonly space to shared readwrite, private if
150 // sharing is enabled. Simply returns true if sharing is not enabled
151 // or if the remapping has already been done by a prior call.
152 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
153
154 static void print_shared_spaces();
155
156 static bool try_link_class(InstanceKlass* ik, TRAPS);
157 static void link_one_shared_class(Klass* obj, TRAPS);
158 static void check_one_shared_class(Klass* obj);
159 static void link_and_cleanup_shared_classes(TRAPS);
160
161 static int count_class(const char* classlist_file);
162 static void estimate_regions_size() NOT_CDS_RETURN;
163 };
164 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP