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_SHARED_READ_WRITE_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M))
36 #define MIN_SHARED_READ_WRITE_SIZE (NOT_LP64(6*M) LP64_ONLY(10*M))
37
38 #define DEFAULT_SHARED_READ_ONLY_SIZE (NOT_LP64(8*M) LP64_ONLY(13*M))
39 #define MIN_SHARED_READ_ONLY_SIZE (NOT_LP64(8*M) LP64_ONLY(13*M))
40
41 // the MIN_SHARED_MISC_DATA_SIZE and MIN_SHARED_MISC_CODE_SIZE estimates are based on
42 // the sizes required for dumping the archive using the default classlist. The sizes
43 // are multiplied by 1.5 for a safety margin.
44
45 #define DEFAULT_SHARED_MISC_DATA_SIZE (NOT_LP64(2*M) LP64_ONLY(4*M))
46 #define MIN_SHARED_MISC_DATA_SIZE (NOT_LP64(1*M) LP64_ONLY(1200*K))
47
48 #define DEFAULT_SHARED_MISC_CODE_SIZE (120*K)
49 #define MIN_SHARED_MISC_CODE_SIZE (NOT_LP64(63*K) LP64_ONLY(69*K))
50 #define DEFAULT_COMBINED_SIZE (DEFAULT_SHARED_READ_WRITE_SIZE+DEFAULT_SHARED_READ_ONLY_SIZE+DEFAULT_SHARED_MISC_DATA_SIZE+DEFAULT_SHARED_MISC_CODE_SIZE)
51
52 // the max size is the MAX size (ie. 0x7FFFFFFF) - the total size of
53 // the other 3 sections - page size (to avoid overflow in case the final
54 // size will get aligned up on page size)
55 #define SHARED_PAGE ((size_t)os::vm_page_size())
56 #define MAX_SHARED_DELTA (0x7FFFFFFF)
57 #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)
58 #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)
59 #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)
60 #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)
61
62 #define LargeSharedArchiveSize (300*M)
63 #define HugeSharedArchiveSize (800*M)
64 #define ReadOnlyRegionPercentage 0.52
65 #define ReadWriteRegionPercentage 0.43
66 #define MiscDataRegionPercentage 0.03
67 #define MiscCodeRegionPercentage 0.02
68 #define LargeThresholdClassCount 5000
69 #define HugeThresholdClassCount 40000
70
71 #define SET_ESTIMATED_SIZE(type, region) \
72 Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \
73 (uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size
74
75 class FileMapInfo;
76
77 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC {
78 public:
79 MetaspaceSharedStats() {
80 memset(this, 0, sizeof(*this));
81 }
82 CompactHashtableStats symbol;
83 CompactHashtableStats string;
84 };
85
86 class SharedMiscRegion VALUE_OBJ_CLASS_SPEC {
87 private:
88 VirtualSpace _vs;
89 char* _alloc_top;
90 SharedSpaceType _space_type;
91
92 public:
93 void initialize(ReservedSpace rs, size_t committed_byte_size, SharedSpaceType space_type);
94 VirtualSpace* virtual_space() {
95 return &_vs;
96 }
97 char* low() const {
98 return _vs.low();
99 }
100 char* alloc_top() const {
101 return _alloc_top;
102 }
103 char* alloc(size_t num_bytes) NOT_CDS_RETURN_(NULL);
104 };
105
106 // Class Data Sharing Support
107 class MetaspaceShared : AllStatic {
108
109 // CDS support
110 static ReservedSpace* _shared_rs;
111 static int _max_alignment;
112 static MetaspaceSharedStats _stats;
113 static bool _has_error_classes;
114 static bool _archive_loading_failed;
115 static bool _remapped_readwrite;
116 static address _cds_i2i_entry_code_buffers;
117 static size_t _cds_i2i_entry_code_buffers_size;
118
119 // Used only during dumping.
120 static SharedMiscRegion _md;
121 static SharedMiscRegion _mc;
122 static SharedMiscRegion _od;
123 public:
124 enum {
125 ro = 0, // read-only shared space in the heap
126 rw = 1, // read-write shared space in the heap
127 md = 2, // miscellaneous data for initializing tables, etc.
128 mc = 3, // miscellaneous code - vtable replacement.
129 max_strings = 2, // max number of string regions in string space
130 num_non_strings = 4, // number of non-string regions
131 first_string = num_non_strings, // index of first string region
132 // The optional data region is the last region.
133 // Currently it only contains class file data.
134 od = max_strings + num_non_strings,
135 n_regions = od + 1 // total number of regions
136 };
137
138 // Accessor functions to save shared space created for metadata, which has
139 // extra space allocated at the end for miscellaneous data and code.
140 static void set_max_alignment(int alignment) {
141 CDS_ONLY(_max_alignment = alignment);
142 }
143
144 static int max_alignment() {
145 CDS_ONLY(return _max_alignment);
146 NOT_CDS(return 0);
147 }
148
149 static void prepare_for_dumping() NOT_CDS_RETURN;
150 static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
151 static int preload_and_dump(const char * class_list_path,
152 GrowableArray<Klass*>* class_promote_order,
153 TRAPS) NOT_CDS_RETURN_(0);
154
155 static ReservedSpace* shared_rs() {
156 CDS_ONLY(return _shared_rs);
157 NOT_CDS(return NULL);
158 }
159
160 static void initialize_shared_rs(ReservedSpace* rs) NOT_CDS_RETURN;
161
162 static void set_archive_loading_failed() {
163 _archive_loading_failed = true;
164 }
165 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
166 static void initialize_shared_spaces() NOT_CDS_RETURN;
167 static void fixup_shared_string_regions() NOT_CDS_RETURN;
168
169 // Return true if given address is in the mapped shared space.
170 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
171
172 // Return true if given address is in the shared region corresponding to the idx
173 static bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false);
174
175 static bool is_string_region(int idx) NOT_CDS_RETURN_(false);
176
177 static intptr_t* allocate_cpp_vtable_clones(intptr_t* top, intptr_t* end);
178 static intptr_t* clone_cpp_vtables(intptr_t* p);
179 static void zero_cpp_vtable_clones_for_writing();
180 static void patch_cpp_vtable_pointers();
181 static bool is_valid_shared_method(const Method* m);
182
183 static void serialize(SerializeClosure* sc, GrowableArray<MemRegion> *string_space,
184 size_t* space_size);
185
186 static MetaspaceSharedStats* stats() {
187 return &_stats;
188 }
189
190 // JVM/TI RedefineClasses() support:
191 // Remap the shared readonly space to shared readwrite, private if
192 // sharing is enabled. Simply returns true if sharing is not enabled
193 // or if the remapping has already been done by a prior call.
194 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
195 static bool remapped_readwrite() {
196 CDS_ONLY(return _remapped_readwrite);
197 NOT_CDS(return false);
198 }
199
200 static void print_shared_spaces();
201
202 static bool try_link_class(InstanceKlass* ik, TRAPS);
203 static void link_and_cleanup_shared_classes(TRAPS);
204 static void check_shared_class_loader_type(Klass* obj);
205
206 static int count_class(const char* classlist_file);
207 static void estimate_regions_size() NOT_CDS_RETURN;
208
209 // Allocate a block of memory from the "mc", "md", or "od" regions.
210 static char* misc_code_space_alloc(size_t num_bytes) { return _mc.alloc(num_bytes); }
211 static char* misc_data_space_alloc(size_t num_bytes) { return _md.alloc(num_bytes); }
212 static char* optional_data_space_alloc(size_t num_bytes) { return _od.alloc(num_bytes); }
213
214 static address cds_i2i_entry_code_buffers(size_t total_size);
215
216 static address cds_i2i_entry_code_buffers() {
217 return _cds_i2i_entry_code_buffers;
218 }
219 static size_t cds_i2i_entry_code_buffers_size() {
220 return _cds_i2i_entry_code_buffers_size;
221 }
222
223 static SharedMiscRegion* misc_code_region() {
224 assert(DumpSharedSpaces, "used during dumping only");
225 return &_mc;
226 }
227 static SharedMiscRegion* misc_data_region() {
228 assert(DumpSharedSpaces, "used during dumping only");
229 return &_md;
230 }
231 static SharedMiscRegion* optional_data_region() {
232 assert(DumpSharedSpaces, "used during dumping only");
233 return &_od;
234 }
235 };
236 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP
|
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 MAX_SHARED_DELTA (0x7FFFFFFF)
36
37 class FileMapInfo;
38
39 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC {
40 public:
41 MetaspaceSharedStats() {
42 memset(this, 0, sizeof(*this));
43 }
44 CompactHashtableStats symbol;
45 CompactHashtableStats string;
46 };
47
48 // Class Data Sharing Support
49 class MetaspaceShared : AllStatic {
50
51 // CDS support
52 static ReservedSpace _shared_rs;
53 static VirtualSpace _shared_vs;
54 static int _max_alignment;
55 static MetaspaceSharedStats _stats;
56 static bool _has_error_classes;
57 static bool _archive_loading_failed;
58 static bool _remapped_readwrite;
59 static address _cds_i2i_entry_code_buffers;
60 static size_t _cds_i2i_entry_code_buffers_size;
61 static size_t _core_spaces_size;
62 public:
63 enum {
64 mc = 0, // miscellaneous code for method trampolines
65 rw = 1, // read-write shared space in the heap
66 ro = 2, // read-only shared space in the heap
67 md = 3, // miscellaneous data for initializing tables, etc.
68 max_strings = 2, // max number of string regions in string space
69 num_non_strings = 4, // number of non-string regions
70 first_string = num_non_strings, // index of first string region
71 // The optional data region is the last region.
72 // Currently it only contains class file data.
73 od = max_strings + num_non_strings,
74 last_valid_region = od,
75 n_regions = od + 1 // total number of regions
76 };
77
78 static void prepare_for_dumping() NOT_CDS_RETURN;
79 static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
80 static int preload_classes(const char * class_list_path,
81 TRAPS) NOT_CDS_RETURN_(0);
82
83 static ReservedSpace* shared_rs() {
84 CDS_ONLY(return &_shared_rs);
85 NOT_CDS(return NULL);
86 }
87 static void commit_shared_space_to(char* newtop) NOT_CDS_RETURN;
88 static size_t core_spaces_size() {
89 return _core_spaces_size;
90 }
91 static void initialize_shared_rs() NOT_CDS_RETURN;
92
93 // Delta of this object from the bottom of the archive.
94 static uintx object_delta(void* obj) {
95 assert(DumpSharedSpaces, "supported only for dumping");
96 assert(shared_rs()->contains(obj), "must be");
97 address base_address = address(shared_rs()->base());
98 uintx delta = address(obj) - base_address;
99 return delta;
100 }
101
102 static void set_archive_loading_failed() {
103 _archive_loading_failed = true;
104 }
105 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
106 static void initialize_shared_spaces() NOT_CDS_RETURN;
107 static void fixup_shared_string_regions() NOT_CDS_RETURN;
108
109 // Return true if given address is in the mapped shared space.
110 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
111
112 // Return true if given address is in the shared region corresponding to the idx
113 static bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false);
114
115 static bool is_in_trampoline_frame(address addr) NOT_CDS_RETURN_(false);
116 static bool is_string_region(int idx) NOT_CDS_RETURN_(false);
117
118 static void allocate_cpp_vtable_clones();
119 static intptr_t* clone_cpp_vtables(intptr_t* p);
120 static void zero_cpp_vtable_clones_for_writing();
121 static void patch_cpp_vtable_pointers();
122 static bool is_valid_shared_method(const Method* m) NOT_CDS_RETURN_(false);
123 static void serialize(SerializeClosure* sc);
124
125
126 static MetaspaceSharedStats* stats() {
127 return &_stats;
128 }
129
130 static void report_out_of_space(const char* name, size_t needed_bytes);
131
132 // JVM/TI RedefineClasses() support:
133 // Remap the shared readonly space to shared readwrite, private if
134 // sharing is enabled. Simply returns true if sharing is not enabled
135 // or if the remapping has already been done by a prior call.
136 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
137 static bool remapped_readwrite() {
138 CDS_ONLY(return _remapped_readwrite);
139 NOT_CDS(return false);
140 }
141
142 static void print_shared_spaces();
143
144 static bool try_link_class(InstanceKlass* ik, TRAPS);
145 static void link_and_cleanup_shared_classes(TRAPS);
146 static void check_shared_class_loader_type(Klass* obj);
147
148 // Allocate a block of memory from the "mc", "ro", or "rw" regions.
149 static char* misc_code_space_alloc(size_t num_bytes);
150 static char* read_only_space_alloc(size_t num_bytes);
151
152 template <typename T>
153 static Array<T>* new_ro_array(int length) {
154 #if INCLUDE_CDS
155 size_t byte_size = Array<T>::byte_sizeof(length, sizeof(T));
156 Array<T>* array = (Array<T>*)read_only_space_alloc(byte_size);
157 array->initialize(length);
158 return array;
159 #else
160 return NULL;
161 #endif
162 }
163
164 static address cds_i2i_entry_code_buffers(size_t total_size);
165
166 static address cds_i2i_entry_code_buffers() {
167 return _cds_i2i_entry_code_buffers;
168 }
169 static size_t cds_i2i_entry_code_buffers_size() {
170 return _cds_i2i_entry_code_buffers_size;
171 }
172 static void relocate_klass_ptr(oop o);
173 };
174 #endif // SHARE_VM_MEMORY_METASPACESHARED_HPP
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