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 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 static bool is_string_region(int idx) {
115 CDS_ONLY(return (idx >= first_string && idx < first_string + max_strings));
116 NOT_CDS(return false);
117 }
118 static bool is_in_trampoline_frame(address addr) NOT_CDS_RETURN_(false);
119
120 static void allocate_cpp_vtable_clones();
121 static intptr_t* clone_cpp_vtables(intptr_t* p);
122 static void zero_cpp_vtable_clones_for_writing();
123 static void patch_cpp_vtable_pointers();
124 static bool is_valid_shared_method(const Method* m) NOT_CDS_RETURN_(false);
125 static void serialize(SerializeClosure* sc);
126
127
128 static MetaspaceSharedStats* stats() {
129 return &_stats;
130 }
131
132 static void report_out_of_space(const char* name, size_t needed_bytes);
133
134 // JVM/TI RedefineClasses() support:
135 // Remap the shared readonly space to shared readwrite, private if
136 // sharing is enabled. Simply returns true if sharing is not enabled
137 // or if the remapping has already been done by a prior call.
138 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
139 static bool remapped_readwrite() {
140 CDS_ONLY(return _remapped_readwrite);
141 NOT_CDS(return false);
142 }
143
144 static void print_shared_spaces();
145
146 static bool try_link_class(InstanceKlass* ik, TRAPS);
|
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 #include "utilities/resourceHash.hpp"
35
36 #define MAX_SHARED_DELTA (0x7FFFFFFF)
37
38 class FileMapInfo;
39
40 class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC {
41 public:
42 MetaspaceSharedStats() {
43 memset(this, 0, sizeof(*this));
44 }
45 CompactHashtableStats symbol;
46 CompactHashtableStats string;
47 };
48
49 // Class Data Sharing Support
50 class MetaspaceShared : AllStatic {
51
52 // CDS support
53 static ReservedSpace _shared_rs;
54 static VirtualSpace _shared_vs;
55 static int _max_alignment;
56 static MetaspaceSharedStats _stats;
57 static bool _has_error_classes;
58 static bool _archive_loading_failed;
59 static bool _remapped_readwrite;
60 static bool _open_archive_heap_region_mapped;
61 static address _cds_i2i_entry_code_buffers;
62 static size_t _cds_i2i_entry_code_buffers_size;
63 static size_t _core_spaces_size;
64 public:
65 enum {
66 // core archive spaces
67 mc = 0, // miscellaneous code for method trampolines
68 rw = 1, // read-write shared space in the heap
69 ro = 2, // read-only shared space in the heap
70 md = 3, // miscellaneous data for initializing tables, etc.
71 num_core_spaces = 4, // number of non-string regions
72
73 // optional mapped spaces
74 // Currently it only contains class file data.
75 od = num_core_spaces,
76 num_non_heap_spaces = od + 1,
77
78 // mapped java heap regions
79 first_string = od + 1, // index of first string region
80 max_strings = 2, // max number of string regions in string space
81 first_open_archive_heap_region = first_string + max_strings,
82 max_open_archive_heap_region = 2,
83
84 last_valid_region = first_open_archive_heap_region + max_open_archive_heap_region - 1,
85 n_regions = last_valid_region + 1 // total number of regions
86 };
87
88 static void prepare_for_dumping() NOT_CDS_RETURN;
89 static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
90 static int preload_classes(const char * class_list_path,
91 TRAPS) NOT_CDS_RETURN_(0);
92
93 #if INCLUDE_CDS_JAVA_HEAP
94 private:
95 static bool obj_equals(oop const& p1, oop const& p2) {
96 return p1 == p2;
97 }
98 static unsigned obj_hash(oop const& p) {
99 unsigned hash = (unsigned)((uintptr_t)&p);
100 return hash ^ (hash >> LogMinObjAlignment);
101 }
102 typedef ResourceHashtable<oop, oop,
103 MetaspaceShared::obj_hash, MetaspaceShared::obj_equals> ArchivedObjectCache;
104 static ArchivedObjectCache* _archive_object_cache;
105
106 public:
107 static ArchivedObjectCache* archive_object_cache() {
108 return _archive_object_cache;
109 }
110 static oop archive_heap_object(oop obj, Thread* THREAD);
111 static void archive_resolved_constants(Thread* THREAD);
112 #endif
113 static bool is_heap_object_archiving_allowed() {
114 CDS_JAVA_HEAP_ONLY(return (UseG1GC && UseCompressedOops && UseCompressedClassPointers);)
115 NOT_CDS_JAVA_HEAP(return false;)
116 }
117 static void create_archive_object_cache() {
118 CDS_JAVA_HEAP_ONLY(_archive_object_cache = new ArchivedObjectCache(););
119 }
120 static void fixup_mapped_heap_regions() NOT_CDS_JAVA_HEAP_RETURN;
121
122 static void dump_open_archive_heap_objects(GrowableArray<MemRegion> * open_archive) NOT_CDS_JAVA_HEAP_RETURN;
123 static void set_open_archive_heap_region_mapped() {
124 CDS_JAVA_HEAP_ONLY(_open_archive_heap_region_mapped = true);
125 NOT_CDS_JAVA_HEAP_RETURN;
126 }
127 static bool open_archive_heap_region_mapped() {
128 CDS_JAVA_HEAP_ONLY(return _open_archive_heap_region_mapped);
129 NOT_CDS_JAVA_HEAP_RETURN_(false);
130 }
131
132 static ReservedSpace* shared_rs() {
133 CDS_ONLY(return &_shared_rs);
134 NOT_CDS(return NULL);
135 }
136 static void commit_shared_space_to(char* newtop) NOT_CDS_RETURN;
137 static size_t core_spaces_size() {
138 return _core_spaces_size;
139 }
140 static void initialize_shared_rs() NOT_CDS_RETURN;
141
142 // Delta of this object from the bottom of the archive.
143 static uintx object_delta(void* obj) {
144 assert(DumpSharedSpaces, "supported only for dumping");
145 assert(shared_rs()->contains(obj), "must be");
146 address base_address = address(shared_rs()->base());
147 uintx delta = address(obj) - base_address;
148 return delta;
149 }
150
151 static void set_archive_loading_failed() {
152 _archive_loading_failed = true;
153 }
154 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
155 static void initialize_shared_spaces() NOT_CDS_RETURN;
156
157 // Return true if given address is in the mapped shared space.
158 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
159
160 // Return true if given address is in the shared region corresponding to the idx
161 static bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false);
162
163 static bool is_heap_region(int idx) {
164 CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_string &&
165 idx < MetaspaceShared::first_open_archive_heap_region +
166 MetaspaceShared::max_open_archive_heap_region));
167 NOT_CDS_JAVA_HEAP_RETURN_(false);
168 }
169 static bool is_string_region(int idx) {
170 CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_string &&
171 idx < MetaspaceShared::first_string + MetaspaceShared::max_strings));
172 NOT_CDS_JAVA_HEAP_RETURN_(false);
173 }
174 static bool is_open_archive_heap_region(int idx) {
175 CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_open_archive_heap_region &&
176 idx < MetaspaceShared::first_open_archive_heap_region +
177 MetaspaceShared::max_open_archive_heap_region));
178 NOT_CDS_JAVA_HEAP_RETURN_(false);
179 }
180 static bool is_in_trampoline_frame(address addr) NOT_CDS_RETURN_(false);
181
182 static void allocate_cpp_vtable_clones();
183 static intptr_t* clone_cpp_vtables(intptr_t* p);
184 static void zero_cpp_vtable_clones_for_writing();
185 static void patch_cpp_vtable_pointers();
186 static bool is_valid_shared_method(const Method* m) NOT_CDS_RETURN_(false);
187 static void serialize(SerializeClosure* sc);
188
189 static MetaspaceSharedStats* stats() {
190 return &_stats;
191 }
192
193 static void report_out_of_space(const char* name, size_t needed_bytes);
194
195 // JVM/TI RedefineClasses() support:
196 // Remap the shared readonly space to shared readwrite, private if
197 // sharing is enabled. Simply returns true if sharing is not enabled
198 // or if the remapping has already been done by a prior call.
199 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
200 static bool remapped_readwrite() {
201 CDS_ONLY(return _remapped_readwrite);
202 NOT_CDS(return false);
203 }
204
205 static void print_shared_spaces();
206
207 static bool try_link_class(InstanceKlass* ik, TRAPS);
|