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 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/systemDictionaryShared.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "gc/shared/gcLocker.hpp"
32 #include "logging/log.hpp"
33 #include "logging/logMessage.hpp"
34 #include "logging/logStream.hpp"
35 #include "memory/archiveUtils.hpp"
36 #include "memory/filemap.hpp"
37 #include "memory/heapShared.inline.hpp"
38 #include "memory/iterator.inline.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/metaspaceClosure.hpp"
41 #include "memory/metaspaceShared.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/compressedOops.inline.hpp"
45 #include "oops/fieldStreams.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "runtime/fieldDescriptor.inline.hpp"
48 #include "runtime/safepointVerifiers.hpp"
49 #include "utilities/bitMap.inline.hpp"
50 #if INCLUDE_G1GC
51 #include "gc/g1/g1CollectedHeap.hpp"
52 #endif
53
54 #if INCLUDE_CDS_JAVA_HEAP
55
56 bool HeapShared::_closed_archive_heap_region_mapped = false;
57 bool HeapShared::_open_archive_heap_region_mapped = false;
58 bool HeapShared::_archive_heap_region_fixed = false;
59
60 address HeapShared::_narrow_oop_base;
61 int HeapShared::_narrow_oop_shift;
62
63 //
64 // If you add new entries to the following tables, you should know what you're doing!
65 //
66
67 // Entry fields for shareable subgraphs archived in the closed archive heap
68 // region. Warning: Objects in the subgraphs should not have reference fields
69 // assigned at runtime.
70 static ArchivableStaticFieldInfo closed_archive_subgraph_entry_fields[] = {
71 {"java/lang/Integer$IntegerCache", "archivedCache"},
72 {"java/lang/Long$LongCache", "archivedCache"},
73 {"java/lang/Byte$ByteCache", "archivedCache"},
74 {"java/lang/Short$ShortCache", "archivedCache"},
75 {"java/lang/Character$CharacterCache", "archivedCache"},
76 {"java/util/jar/Attributes$Name", "KNOWN_NAMES"},
77 {"sun/util/locale/BaseLocale", "constantBaseLocales"},
78 };
79 // Entry fields for subgraphs archived in the open archive heap region.
80 static ArchivableStaticFieldInfo open_archive_subgraph_entry_fields[] = {
81 {"jdk/internal/module/ArchivedModuleGraph", "archivedModuleGraph"},
82 {"java/util/ImmutableCollections", "archivedObjects"},
83 {"java/lang/module/Configuration", "EMPTY_CONFIGURATION"},
84 {"jdk/internal/math/FDBigInteger", "archivedCaches"},
85 };
86
87 const static int num_closed_archive_subgraph_entry_fields =
88 sizeof(closed_archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo);
89 const static int num_open_archive_subgraph_entry_fields =
90 sizeof(open_archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo);
91
92 ////////////////////////////////////////////////////////////////
93 //
94 // Java heap object archiving support
95 //
96 ////////////////////////////////////////////////////////////////
97 void HeapShared::fixup_mapped_heap_regions() {
98 FileMapInfo *mapinfo = FileMapInfo::current_info();
99 mapinfo->fixup_mapped_heap_regions();
100 set_archive_heap_region_fixed();
101 SystemDictionaryShared::update_archived_mirror_native_pointers();
102 }
103
104 unsigned HeapShared::oop_hash(oop const& p) {
105 assert(!p->mark().has_bias_pattern(),
106 "this object should never have been locked"); // so identity_hash won't safepoin
107 unsigned hash = (unsigned)p->identity_hash();
108 return hash;
109 }
110
111 HeapShared::ArchivedObjectCache* HeapShared::_archived_object_cache = NULL;
112 oop HeapShared::find_archived_heap_object(oop obj) {
113 assert(DumpSharedSpaces, "dump-time only");
114 ArchivedObjectCache* cache = archived_object_cache();
115 oop* p = cache->get(obj);
116 if (p != NULL) {
117 return *p;
118 } else {
119 return NULL;
120 }
121 }
122
123 oop HeapShared::archive_heap_object(oop obj, Thread* THREAD) {
124 assert(DumpSharedSpaces, "dump-time only");
125
126 oop ao = find_archived_heap_object(obj);
127 if (ao != NULL) {
128 // already archived
129 return ao;
130 }
216 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops),
217 BOOL_TO_STR(UseCompressedClassPointers));
218 return;
219 }
220
221 G1HeapVerifier::verify_ready_for_archiving();
222
223 {
224 NoSafepointVerifier nsv;
225
226 // Cache for recording where the archived objects are copied to
227 create_archived_object_cache();
228
229 log_info(cds)("Dumping objects to closed archive heap region ...");
230 NOT_PRODUCT(StringTable::verify());
231 copy_closed_archive_heap_objects(closed);
232
233 log_info(cds)("Dumping objects to open archive heap region ...");
234 copy_open_archive_heap_objects(open);
235
236 destroy_archived_object_cache();
237 }
238
239 G1HeapVerifier::verify_archive_regions();
240 }
241
242 void HeapShared::copy_closed_archive_heap_objects(
243 GrowableArray<MemRegion> * closed_archive) {
244 assert(is_heap_object_archiving_allowed(), "Cannot archive java heap objects");
245
246 Thread* THREAD = Thread::current();
247 G1CollectedHeap::heap()->begin_archive_alloc_range();
248
249 // Archive interned string objects
250 StringTable::write_to_archive();
251
252 archive_object_subgraphs(closed_archive_subgraph_entry_fields,
253 num_closed_archive_subgraph_entry_fields,
254 true /* is_closed_archive */, THREAD);
255
448
449 _run_time_subgraph_info_table.reset();
450
451 CompactHashtableWriter writer(d_table->_count, &stats);
452 CopyKlassSubGraphInfoToArchive copy(&writer);
453 d_table->iterate(©);
454
455 writer.dump(&_run_time_subgraph_info_table, "subgraphs");
456 }
457
458 void HeapShared::serialize_subgraph_info_table_header(SerializeClosure* soc) {
459 _run_time_subgraph_info_table.serialize_header(soc);
460 }
461
462 void HeapShared::initialize_from_archived_subgraph(Klass* k) {
463 if (!open_archive_heap_region_mapped()) {
464 return; // nothing to do
465 }
466 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
467
468 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary(k);
469 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0);
470
471 // Initialize from archived data. Currently this is done only
472 // during VM initialization time. No lock is needed.
473 if (record != NULL) {
474 Thread* THREAD = Thread::current();
475
476 int i;
477 // Load/link/initialize the klasses of the objects in the subgraph.
478 // NULL class loader is used.
479 Array<Klass*>* klasses = record->subgraph_object_klasses();
480 if (klasses != NULL) {
481 for (i = 0; i < klasses->length(); i++) {
482 Klass* obj_k = klasses->at(i);
483 Klass* resolved_k = SystemDictionary::resolve_or_null(
484 (obj_k)->name(), THREAD);
485 if (resolved_k != obj_k) {
486 assert(!SystemDictionary::is_well_known_klass(resolved_k),
487 "shared well-known classes must not be replaced by JVMTI ClassFileLoadHook");
606 }
607 };
608
609 void HeapShared::check_closed_archive_heap_region_object(InstanceKlass* k,
610 Thread* THREAD) {
611 // Check fields in the object
612 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
613 if (!fs.access_flags().is_static()) {
614 BasicType ft = fs.field_descriptor().field_type();
615 if (!fs.access_flags().is_final() && is_reference_type(ft)) {
616 ResourceMark rm(THREAD);
617 log_warning(cds, heap)(
618 "Please check reference field in %s instance in closed archive heap region: %s %s",
619 k->external_name(), (fs.name())->as_C_string(),
620 (fs.signature())->as_C_string());
621 }
622 }
623 }
624 }
625
626 // (1) If orig_obj has not been archived yet, archive it.
627 // (2) If orig_obj has not been seen yet (since start_recording_subgraph() was called),
628 // trace all objects that are reachable from it, and make sure these objects are archived.
629 // (3) Record the klasses of all orig_obj and all reachable objects.
630 oop HeapShared::archive_reachable_objects_from(int level,
631 KlassSubGraphInfo* subgraph_info,
632 oop orig_obj,
633 bool is_closed_archive,
634 TRAPS) {
635 assert(orig_obj != NULL, "must be");
636 assert(!is_archived_object(orig_obj), "sanity");
637
638 if (!JavaClasses::is_supported_for_archiving(orig_obj)) {
639 // This object has injected fields that cannot be supported easily, so we disallow them for now.
640 // If you get an error here, you probably made a change in the JDK library that has added
641 // these objects that are referenced (directly or indirectly) by static fields.
642 ResourceMark rm;
643 log_error(cds, heap)("Cannot archive object of class %s", orig_obj->klass()->external_name());
644 vm_exit(1);
645 }
673 ++_num_new_archived_objs;
674 archived_obj = archive_heap_object(orig_obj, THREAD);
675 if (archived_obj == NULL) {
676 // Skip archiving the sub-graph referenced from the current entry field.
677 ResourceMark rm;
678 log_error(cds, heap)(
679 "Cannot archive the sub-graph referenced from %s object ("
680 PTR_FORMAT ") size %d, skipped.",
681 orig_obj->klass()->external_name(), p2i(orig_obj), orig_obj->size() * HeapWordSize);
682 if (level == 1) {
683 // Don't archive a subgraph root that's too big. For archives static fields, that's OK
684 // as the Java code will take care of initializing this field dynamically.
685 return NULL;
686 } else {
687 // We don't know how to handle an object that has been archived, but some of its reachable
688 // objects cannot be archived. Bail out for now. We might need to fix this in the future if
689 // we have a real use case.
690 vm_exit(1);
691 }
692 }
693 }
694
695 assert(archived_obj != NULL, "must be");
696 Klass *orig_k = orig_obj->klass();
697 Klass *relocated_k = archived_obj->klass();
698 subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
699
700 WalkOopAndArchiveClosure walker(level, is_closed_archive, record_klasses_only,
701 subgraph_info, orig_obj, archived_obj, THREAD);
702 orig_obj->oop_iterate(&walker);
703 if (is_closed_archive && orig_k->is_instance_klass()) {
704 check_closed_archive_heap_region_object(InstanceKlass::cast(orig_k), THREAD);
705 }
706 return archived_obj;
707 }
708
709 //
710 // Start from the given static field in a java mirror and archive the
711 // complete sub-graph of java heap objects that are reached directly
712 // or indirectly from the starting object by following references.
969 // [1] Dump the subgraph of each archived field
970 // [2] Create a list of all the class of the objects that can be reached
971 // by any of these static fields.
972 // At runtime, these classes are initialized before X's archived fields
973 // are restored by HeapShared::initialize_from_archived_subgraph().
974 int i;
975 for (i = 0; i < num; ) {
976 ArchivableStaticFieldInfo* info = &fields[i];
977 const char* klass_name = info->klass_name;
978 start_recording_subgraph(info->klass, klass_name);
979
980 // If you have specified consecutive fields of the same klass in
981 // fields[], these will be archived in the same
982 // {start_recording_subgraph ... done_recording_subgraph} pass to
983 // save time.
984 for (; i < num; i++) {
985 ArchivableStaticFieldInfo* f = &fields[i];
986 if (f->klass_name != klass_name) {
987 break;
988 }
989 archive_reachable_objects_from_static_field(f->klass, f->klass_name,
990 f->offset, f->field_name,
991 is_closed_archive, CHECK);
992 }
993 done_recording_subgraph(info->klass, klass_name);
994 }
995
996 log_info(cds, heap)("Archived subgraph records in %s archive heap region = %d",
997 is_closed_archive ? "closed" : "open",
998 _num_total_subgraph_recordings);
999 log_info(cds, heap)(" Walked %d objects", _num_total_walked_objs);
1000 log_info(cds, heap)(" Archived %d objects", _num_total_archived_objs);
1001 log_info(cds, heap)(" Recorded %d klasses", _num_total_recorded_klasses);
1002
1003 #ifndef PRODUCT
1004 for (int i = 0; i < num; i++) {
1005 ArchivableStaticFieldInfo* f = &fields[i];
1006 verify_subgraph_from_static_field(f->klass, f->offset);
1007 }
1008 log_info(cds, heap)(" Verified %d references", _num_total_verifications);
1009 #endif
1010 }
1011
|
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 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/classLoaderDataShared.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/systemDictionaryShared.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "gc/shared/gcLocker.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logMessage.hpp"
38 #include "logging/logStream.hpp"
39 #include "memory/archiveUtils.hpp"
40 #include "memory/filemap.hpp"
41 #include "memory/heapShared.inline.hpp"
42 #include "memory/iterator.inline.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/metaspaceClosure.hpp"
45 #include "memory/metaspaceShared.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/compressedOops.inline.hpp"
49 #include "oops/fieldStreams.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "runtime/fieldDescriptor.inline.hpp"
52 #include "runtime/javaCalls.hpp"
53 #include "runtime/safepointVerifiers.hpp"
54 #include "utilities/bitMap.inline.hpp"
55 #if INCLUDE_G1GC
56 #include "gc/g1/g1CollectedHeap.hpp"
57 #endif
58
59 #if INCLUDE_CDS_JAVA_HEAP
60
61 bool HeapShared::_closed_archive_heap_region_mapped = false;
62 bool HeapShared::_open_archive_heap_region_mapped = false;
63 bool HeapShared::_archive_heap_region_fixed = false;
64
65 address HeapShared::_narrow_oop_base;
66 int HeapShared::_narrow_oop_shift;
67
68 //
69 // If you add new entries to the following tables, you should know what you're doing!
70 //
71
72 // Entry fields for shareable subgraphs archived in the closed archive heap
73 // region. Warning: Objects in the subgraphs should not have reference fields
74 // assigned at runtime.
75 static ArchivableStaticFieldInfo closed_archive_subgraph_entry_fields[] = {
76 {"java/lang/Integer$IntegerCache", 0, "archivedCache"},
77 {"java/lang/Long$LongCache", 0, "archivedCache"},
78 {"java/lang/Byte$ByteCache", 0, "archivedCache"},
79 {"java/lang/Short$ShortCache", 0, "archivedCache"},
80 {"java/lang/Character$CharacterCache", 0, "archivedCache"},
81 {"java/util/jar/Attributes$Name", 0, "KNOWN_NAMES"},
82 {"sun/util/locale/BaseLocale", 0, "constantBaseLocales"},
83 };
84 // Entry fields for subgraphs archived in the open archive heap region.
85 static ArchivableStaticFieldInfo open_archive_subgraph_entry_fields[] = {
86 {"jdk/internal/loader/ArchivedClassLoaders", 1, "archivedClassLoaders"},
87 {"jdk/internal/module/ArchivedBootLayer", 1, "archivedBootLayer"},
88 {"jdk/internal/module/ArchivedModuleGraph", 0, "archivedModuleGraph"},
89 {"java/util/ImmutableCollections", 0, "archivedObjects"},
90 {"java/lang/Module$ArchivedData", 1, "archivedData"},
91 {"java/lang/module/Configuration", 0, "EMPTY_CONFIGURATION"},
92 {"jdk/internal/math/FDBigInteger", 0, "archivedCaches"},
93 };
94
95 const static int num_closed_archive_subgraph_entry_fields =
96 sizeof(closed_archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo);
97 const static int num_open_archive_subgraph_entry_fields =
98 sizeof(open_archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo);
99
100 ////////////////////////////////////////////////////////////////
101 //
102 // Java heap object archiving support
103 //
104 ////////////////////////////////////////////////////////////////
105 void HeapShared::fixup_mapped_heap_regions() {
106 FileMapInfo *mapinfo = FileMapInfo::current_info();
107 mapinfo->fixup_mapped_heap_regions();
108 set_archive_heap_region_fixed();
109 SystemDictionaryShared::update_archived_mirror_native_pointers();
110 }
111
112 unsigned HeapShared::oop_hash(oop const& p) {
113 assert(!p->mark().has_bias_pattern(),
114 "this object should never have been locked"); // so identity_hash won't safepoin
115 unsigned hash = (unsigned)p->identity_hash();
116 return hash;
117 }
118
119 static void reset_states(oop obj, TRAPS) {
120 Handle h_obj(THREAD, obj);
121 InstanceKlass* klass = InstanceKlass::cast(obj->klass());
122 TempNewSymbol method_name = SymbolTable::new_symbol("resetArchivedStates");
123 Symbol* method_sig = vmSymbols::void_method_signature();
124
125 while (klass != NULL) {
126 Method* method = klass->find_method(method_name, method_sig);
127 if (method != NULL) {
128 assert(method->is_private(), "must be");
129 if (log_is_enabled(Debug, cds)) {
130 ResourceMark rm(THREAD);
131 log_debug(cds)(" calling %s", method->name_and_sig_as_C_string());
132 }
133 JavaValue result(T_VOID);
134 JavaCalls::call_special(&result, h_obj, klass,
135 method_name, method_sig, CHECK);
136 }
137 klass = klass->java_super();
138 }
139 }
140
141 void HeapShared::reset_archived_object_states(TRAPS) {
142 assert(DumpSharedSpaces, "dump-time only");
143 log_debug(cds)("Resetting platform loader");
144 reset_states(SystemDictionary::java_platform_loader(), THREAD);
145 log_debug(cds)("Resetting system loader");
146 reset_states(SystemDictionary::java_system_loader(), THREAD);
147 }
148
149 HeapShared::ArchivedObjectCache* HeapShared::_archived_object_cache = NULL;
150 oop HeapShared::find_archived_heap_object(oop obj) {
151 assert(DumpSharedSpaces, "dump-time only");
152 ArchivedObjectCache* cache = archived_object_cache();
153 oop* p = cache->get(obj);
154 if (p != NULL) {
155 return *p;
156 } else {
157 return NULL;
158 }
159 }
160
161 oop HeapShared::archive_heap_object(oop obj, Thread* THREAD) {
162 assert(DumpSharedSpaces, "dump-time only");
163
164 oop ao = find_archived_heap_object(obj);
165 if (ao != NULL) {
166 // already archived
167 return ao;
168 }
254 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops),
255 BOOL_TO_STR(UseCompressedClassPointers));
256 return;
257 }
258
259 G1HeapVerifier::verify_ready_for_archiving();
260
261 {
262 NoSafepointVerifier nsv;
263
264 // Cache for recording where the archived objects are copied to
265 create_archived_object_cache();
266
267 log_info(cds)("Dumping objects to closed archive heap region ...");
268 NOT_PRODUCT(StringTable::verify());
269 copy_closed_archive_heap_objects(closed);
270
271 log_info(cds)("Dumping objects to open archive heap region ...");
272 copy_open_archive_heap_objects(open);
273
274 ClassLoaderDataShared::init_archived_oops();
275
276 destroy_archived_object_cache();
277 }
278
279 G1HeapVerifier::verify_archive_regions();
280 }
281
282 void HeapShared::copy_closed_archive_heap_objects(
283 GrowableArray<MemRegion> * closed_archive) {
284 assert(is_heap_object_archiving_allowed(), "Cannot archive java heap objects");
285
286 Thread* THREAD = Thread::current();
287 G1CollectedHeap::heap()->begin_archive_alloc_range();
288
289 // Archive interned string objects
290 StringTable::write_to_archive();
291
292 archive_object_subgraphs(closed_archive_subgraph_entry_fields,
293 num_closed_archive_subgraph_entry_fields,
294 true /* is_closed_archive */, THREAD);
295
488
489 _run_time_subgraph_info_table.reset();
490
491 CompactHashtableWriter writer(d_table->_count, &stats);
492 CopyKlassSubGraphInfoToArchive copy(&writer);
493 d_table->iterate(©);
494
495 writer.dump(&_run_time_subgraph_info_table, "subgraphs");
496 }
497
498 void HeapShared::serialize_subgraph_info_table_header(SerializeClosure* soc) {
499 _run_time_subgraph_info_table.serialize_header(soc);
500 }
501
502 void HeapShared::initialize_from_archived_subgraph(Klass* k) {
503 if (!open_archive_heap_region_mapped()) {
504 return; // nothing to do
505 }
506 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
507
508 if (!MetaspaceShared::use_full_module_graph()) {
509 for (int i = 0; i < num_open_archive_subgraph_entry_fields; i++) {
510 const ArchivableStaticFieldInfo* info = &open_archive_subgraph_entry_fields[i];
511 if (info->full_module_graph_only && k->name()->equals(info->klass_name)) {
512 return;
513 }
514 }
515 }
516
517 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary(k);
518 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0);
519
520 // Initialize from archived data. Currently this is done only
521 // during VM initialization time. No lock is needed.
522 if (record != NULL) {
523 Thread* THREAD = Thread::current();
524
525 int i;
526 // Load/link/initialize the klasses of the objects in the subgraph.
527 // NULL class loader is used.
528 Array<Klass*>* klasses = record->subgraph_object_klasses();
529 if (klasses != NULL) {
530 for (i = 0; i < klasses->length(); i++) {
531 Klass* obj_k = klasses->at(i);
532 Klass* resolved_k = SystemDictionary::resolve_or_null(
533 (obj_k)->name(), THREAD);
534 if (resolved_k != obj_k) {
535 assert(!SystemDictionary::is_well_known_klass(resolved_k),
536 "shared well-known classes must not be replaced by JVMTI ClassFileLoadHook");
655 }
656 };
657
658 void HeapShared::check_closed_archive_heap_region_object(InstanceKlass* k,
659 Thread* THREAD) {
660 // Check fields in the object
661 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
662 if (!fs.access_flags().is_static()) {
663 BasicType ft = fs.field_descriptor().field_type();
664 if (!fs.access_flags().is_final() && is_reference_type(ft)) {
665 ResourceMark rm(THREAD);
666 log_warning(cds, heap)(
667 "Please check reference field in %s instance in closed archive heap region: %s %s",
668 k->external_name(), (fs.name())->as_C_string(),
669 (fs.signature())->as_C_string());
670 }
671 }
672 }
673 }
674
675 void HeapShared::check_module_oop(oop orig_module_obj) {
676 assert(DumpSharedSpaces, "must be");
677 assert(java_lang_Module::is_instance(orig_module_obj), "must be");
678 ModuleEntry* orig_module_ent = java_lang_Module::module_entry_raw(orig_module_obj);
679 if (orig_module_ent == NULL) {
680 // These special Module objects are created in Java code. They are not
681 // defined via Modules::define_module(), so they don't have a ModuleEntry:
682 // java.lang.Module::ALL_UNNAMED_MODULE
683 // java.lang.Module::EVERYONE_MODULE
684 // jdk.internal.loader.ClassLoaders$BootClassLoader::unnamedModule
685 assert(java_lang_Module::name(orig_module_obj) == NULL, "must be unnamed");
686 log_info(cds, heap)("Module oop with No ModuleEntry* @[" PTR_FORMAT "]", p2i(orig_module_obj));
687 } else {
688 ClassLoaderData* loader_data = orig_module_ent->loader_data();
689 assert(loader_data->is_builtin_class_loader_data(), "must be");
690 }
691 }
692
693
694 // (1) If orig_obj has not been archived yet, archive it.
695 // (2) If orig_obj has not been seen yet (since start_recording_subgraph() was called),
696 // trace all objects that are reachable from it, and make sure these objects are archived.
697 // (3) Record the klasses of all orig_obj and all reachable objects.
698 oop HeapShared::archive_reachable_objects_from(int level,
699 KlassSubGraphInfo* subgraph_info,
700 oop orig_obj,
701 bool is_closed_archive,
702 TRAPS) {
703 assert(orig_obj != NULL, "must be");
704 assert(!is_archived_object(orig_obj), "sanity");
705
706 if (!JavaClasses::is_supported_for_archiving(orig_obj)) {
707 // This object has injected fields that cannot be supported easily, so we disallow them for now.
708 // If you get an error here, you probably made a change in the JDK library that has added
709 // these objects that are referenced (directly or indirectly) by static fields.
710 ResourceMark rm;
711 log_error(cds, heap)("Cannot archive object of class %s", orig_obj->klass()->external_name());
712 vm_exit(1);
713 }
741 ++_num_new_archived_objs;
742 archived_obj = archive_heap_object(orig_obj, THREAD);
743 if (archived_obj == NULL) {
744 // Skip archiving the sub-graph referenced from the current entry field.
745 ResourceMark rm;
746 log_error(cds, heap)(
747 "Cannot archive the sub-graph referenced from %s object ("
748 PTR_FORMAT ") size %d, skipped.",
749 orig_obj->klass()->external_name(), p2i(orig_obj), orig_obj->size() * HeapWordSize);
750 if (level == 1) {
751 // Don't archive a subgraph root that's too big. For archives static fields, that's OK
752 // as the Java code will take care of initializing this field dynamically.
753 return NULL;
754 } else {
755 // We don't know how to handle an object that has been archived, but some of its reachable
756 // objects cannot be archived. Bail out for now. We might need to fix this in the future if
757 // we have a real use case.
758 vm_exit(1);
759 }
760 }
761
762 if (java_lang_Module::is_instance(orig_obj)) {
763 check_module_oop(orig_obj);
764 java_lang_Module::set_module_entry(archived_obj, NULL);
765 java_lang_Module::set_loader(archived_obj, NULL);
766 } else if (java_lang_ClassLoader::is_instance(orig_obj)) {
767 // class_data will be restored explicitly at run time.
768 guarantee(orig_obj == SystemDictionary::java_platform_loader() ||
769 orig_obj == SystemDictionary::java_system_loader() ||
770 java_lang_ClassLoader::loader_data_raw(orig_obj) == NULL, "must be");
771 java_lang_ClassLoader::release_set_loader_data(archived_obj, NULL);
772 }
773 }
774
775 assert(archived_obj != NULL, "must be");
776 Klass *orig_k = orig_obj->klass();
777 Klass *relocated_k = archived_obj->klass();
778 subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
779
780 WalkOopAndArchiveClosure walker(level, is_closed_archive, record_klasses_only,
781 subgraph_info, orig_obj, archived_obj, THREAD);
782 orig_obj->oop_iterate(&walker);
783 if (is_closed_archive && orig_k->is_instance_klass()) {
784 check_closed_archive_heap_region_object(InstanceKlass::cast(orig_k), THREAD);
785 }
786 return archived_obj;
787 }
788
789 //
790 // Start from the given static field in a java mirror and archive the
791 // complete sub-graph of java heap objects that are reached directly
792 // or indirectly from the starting object by following references.
1049 // [1] Dump the subgraph of each archived field
1050 // [2] Create a list of all the class of the objects that can be reached
1051 // by any of these static fields.
1052 // At runtime, these classes are initialized before X's archived fields
1053 // are restored by HeapShared::initialize_from_archived_subgraph().
1054 int i;
1055 for (i = 0; i < num; ) {
1056 ArchivableStaticFieldInfo* info = &fields[i];
1057 const char* klass_name = info->klass_name;
1058 start_recording_subgraph(info->klass, klass_name);
1059
1060 // If you have specified consecutive fields of the same klass in
1061 // fields[], these will be archived in the same
1062 // {start_recording_subgraph ... done_recording_subgraph} pass to
1063 // save time.
1064 for (; i < num; i++) {
1065 ArchivableStaticFieldInfo* f = &fields[i];
1066 if (f->klass_name != klass_name) {
1067 break;
1068 }
1069
1070 if (!info->full_module_graph_only || MetaspaceShared::use_full_module_graph()) {
1071 archive_reachable_objects_from_static_field(f->klass, f->klass_name,
1072 f->offset, f->field_name,
1073 is_closed_archive, CHECK);
1074 }
1075 }
1076 done_recording_subgraph(info->klass, klass_name);
1077 }
1078
1079 log_info(cds, heap)("Archived subgraph records in %s archive heap region = %d",
1080 is_closed_archive ? "closed" : "open",
1081 _num_total_subgraph_recordings);
1082 log_info(cds, heap)(" Walked %d objects", _num_total_walked_objs);
1083 log_info(cds, heap)(" Archived %d objects", _num_total_archived_objs);
1084 log_info(cds, heap)(" Recorded %d klasses", _num_total_recorded_klasses);
1085
1086 #ifndef PRODUCT
1087 for (int i = 0; i < num; i++) {
1088 ArchivableStaticFieldInfo* f = &fields[i];
1089 verify_subgraph_from_static_field(f->klass, f->offset);
1090 }
1091 log_info(cds, heap)(" Verified %d references", _num_total_verifications);
1092 #endif
1093 }
1094
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