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
|
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/moduleEntry.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/systemDictionaryShared.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "gc/shared/gcLocker.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logMessage.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/archiveUtils.hpp"
38 #include "memory/filemap.hpp"
39 #include "memory/heapShared.inline.hpp"
40 #include "memory/iterator.inline.hpp"
41 #include "memory/metadataFactory.hpp"
42 #include "memory/metaspaceClosure.hpp"
43 #include "memory/metaspaceShared.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.hpp"
46 #include "oops/compressedOops.inline.hpp"
47 #include "oops/fieldStreams.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "runtime/fieldDescriptor.inline.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/safepointVerifiers.hpp"
52 #include "utilities/bitMap.inline.hpp"
53 #if INCLUDE_G1GC
54 #include "gc/g1/g1CollectedHeap.hpp"
55 #endif
56
57 #if INCLUDE_CDS_JAVA_HEAP
58
59 bool HeapShared::_closed_archive_heap_region_mapped = false;
60 bool HeapShared::_open_archive_heap_region_mapped = false;
61 bool HeapShared::_archive_heap_region_fixed = false;
62
63 address HeapShared::_narrow_oop_base;
64 int HeapShared::_narrow_oop_shift;
65
66 //
67 // If you add new entries to the following tables, you should know what you're doing!
68 //
69
70 // Entry fields for shareable subgraphs archived in the closed archive heap
71 // region. Warning: Objects in the subgraphs should not have reference fields
72 // assigned at runtime.
73 static ArchivableStaticFieldInfo closed_archive_subgraph_entry_fields[] = {
74 {"java/lang/Integer$IntegerCache", 0, "archivedCache"},
75 {"java/lang/Long$LongCache", 0, "archivedCache"},
76 {"java/lang/Byte$ByteCache", 0, "archivedCache"},
77 {"java/lang/Short$ShortCache", 0, "archivedCache"},
78 {"java/lang/Character$CharacterCache", 0, "archivedCache"},
79 {"java/util/jar/Attributes$Name", 0, "KNOWN_NAMES"},
80 {"sun/util/locale/BaseLocale", 0, "constantBaseLocales"},
81 };
82 // Entry fields for subgraphs archived in the open archive heap region.
83 static ArchivableStaticFieldInfo open_archive_subgraph_entry_fields[] = {
84 {"jdk/internal/loader/BuiltinClassLoader$ArchivedData", 1, "packageToModule"},
85 {"jdk/internal/loader/BootLoader$ArchivedData", 1, "servicesCatalog"},
86 {"jdk/internal/loader/ClassLoaders$ArchivedData", 1, "singleton"},
87 {"jdk/internal/module/ModuleBootstrap$ArchivedBootLayer", 1, "archivedBootLayer"},
88 {"jdk/internal/module/ArchivedModuleGraph", 0, "archivedModuleGraph"},
89 {"java/util/ImmutableCollections", 0, "archivedObjects"},
90 {"java/lang/Module$ArchivedData", 1, "singleton"},
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 log_debug(cds)("Resetting platform loader");
143 reset_states(SystemDictionary::java_platform_loader(), THREAD);
144 log_debug(cds)("Resetting system loader");
145 reset_states(SystemDictionary::java_system_loader(), THREAD);
146 }
147
148 HeapShared::ArchivedObjectCache* HeapShared::_archived_object_cache = NULL;
149 oop HeapShared::find_archived_heap_object(oop obj) {
150 assert(DumpSharedSpaces, "dump-time only");
151 ArchivedObjectCache* cache = archived_object_cache();
152 oop* p = cache->get(obj);
153 if (p != NULL) {
154 return *p;
155 } else {
156 return NULL;
157 }
158 }
159
160 oop HeapShared::archive_heap_object(oop obj, Thread* THREAD) {
161 assert(DumpSharedSpaces, "dump-time only");
162
163 oop ao = find_archived_heap_object(obj);
164 if (ao != NULL) {
165 // already archived
166 return ao;
167 }
253 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops),
254 BOOL_TO_STR(UseCompressedClassPointers));
255 return;
256 }
257
258 G1HeapVerifier::verify_ready_for_archiving();
259
260 {
261 NoSafepointVerifier nsv;
262
263 // Cache for recording where the archived objects are copied to
264 create_archived_object_cache();
265
266 log_info(cds)("Dumping objects to closed archive heap region ...");
267 NOT_PRODUCT(StringTable::verify());
268 copy_closed_archive_heap_objects(closed);
269
270 log_info(cds)("Dumping objects to open archive heap region ...");
271 copy_open_archive_heap_objects(open);
272
273 ClassLoaderData::init_archived_oops();
274
275 destroy_archived_object_cache();
276 }
277
278 G1HeapVerifier::verify_archive_regions();
279 }
280
281 void HeapShared::copy_closed_archive_heap_objects(
282 GrowableArray<MemRegion> * closed_archive) {
283 assert(is_heap_object_archiving_allowed(), "Cannot archive java heap objects");
284
285 Thread* THREAD = Thread::current();
286 G1CollectedHeap::heap()->begin_archive_alloc_range();
287
288 // Archive interned string objects
289 StringTable::write_to_archive();
290
291 archive_object_subgraphs(closed_archive_subgraph_entry_fields,
292 num_closed_archive_subgraph_entry_fields,
293 true /* is_closed_archive */, THREAD);
294
487
488 _run_time_subgraph_info_table.reset();
489
490 CompactHashtableWriter writer(d_table->_count, &stats);
491 CopyKlassSubGraphInfoToArchive copy(&writer);
492 d_table->iterate(©);
493
494 writer.dump(&_run_time_subgraph_info_table, "subgraphs");
495 }
496
497 void HeapShared::serialize_subgraph_info_table_header(SerializeClosure* soc) {
498 _run_time_subgraph_info_table.serialize_header(soc);
499 }
500
501 void HeapShared::initialize_from_archived_subgraph(Klass* k) {
502 if (!open_archive_heap_region_mapped()) {
503 return; // nothing to do
504 }
505 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
506
507 if (!MetaspaceShared::use_full_module_graph()) {
508 for (int i = 0; i < num_open_archive_subgraph_entry_fields; i++) {
509 const ArchivableStaticFieldInfo* info = &open_archive_subgraph_entry_fields[i];
510 if (info->full_module_graph_only && k->name()->equals(info->klass_name)) {
511 return;
512 }
513 }
514 }
515
516 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary(k);
517 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0);
518
519 // Initialize from archived data. Currently this is done only
520 // during VM initialization time. No lock is needed.
521 if (record != NULL) {
522 Thread* THREAD = Thread::current();
523
524 int i;
525 // Load/link/initialize the klasses of the objects in the subgraph.
526 // NULL class loader is used.
527 Array<Klass*>* klasses = record->subgraph_object_klasses();
528 if (klasses != NULL) {
529 for (i = 0; i < klasses->length(); i++) {
530 Klass* obj_k = klasses->at(i);
531 Klass* resolved_k = SystemDictionary::resolve_or_null(
532 (obj_k)->name(), THREAD);
533 if (resolved_k != obj_k) {
534 assert(!SystemDictionary::is_well_known_klass(resolved_k),
535 "shared well-known classes must not be replaced by JVMTI ClassFileLoadHook");
654 }
655 };
656
657 void HeapShared::check_closed_archive_heap_region_object(InstanceKlass* k,
658 Thread* THREAD) {
659 // Check fields in the object
660 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
661 if (!fs.access_flags().is_static()) {
662 BasicType ft = fs.field_descriptor().field_type();
663 if (!fs.access_flags().is_final() && is_reference_type(ft)) {
664 ResourceMark rm(THREAD);
665 log_warning(cds, heap)(
666 "Please check reference field in %s instance in closed archive heap region: %s %s",
667 k->external_name(), (fs.name())->as_C_string(),
668 (fs.signature())->as_C_string());
669 }
670 }
671 }
672 }
673
674 void HeapShared::check_module_oop(oop orig_module_obj) {
675 assert(DumpSharedSpaces, "must be");
676 assert(java_lang_Module::is_instance(orig_module_obj), "must be");
677 ModuleEntry* orig_module_ent = java_lang_Module::module_entry_raw(orig_module_obj);
678 if (orig_module_ent == NULL) {
679 // These special Module objects are created in Java code. They are not
680 // defined via Modules::define_module(), so they don't have a ModuleEntry:
681 // java.lang.Module::ALL_UNNAMED_MODULE
682 // java.lang.Module::EVERYONE_MODULE
683 // jdk.internal.loader.ClassLoaders$BootClassLoader::unnamedModule
684 assert(java_lang_Module::name(orig_module_obj) == NULL, "must be unnamed");
685 log_info(cds, heap)("Module oop with No ModuleEntry* @[" PTR_FORMAT "]", p2i(orig_module_obj));
686 } else {
687 ClassLoaderData* loader_data = orig_module_ent->loader_data();
688 assert(loader_data->is_builtin_class_loader_data(), "must be");
689 }
690 }
691
692
693 // (1) If orig_obj has not been archived yet, archive it.
694 // (2) If orig_obj has not been seen yet (since start_recording_subgraph() was called),
695 // trace all objects that are reachable from it, and make sure these objects are archived.
696 // (3) Record the klasses of all orig_obj and all reachable objects.
697 oop HeapShared::archive_reachable_objects_from(int level,
698 KlassSubGraphInfo* subgraph_info,
699 oop orig_obj,
700 bool is_closed_archive,
701 TRAPS) {
702 assert(orig_obj != NULL, "must be");
703 assert(!is_archived_object(orig_obj), "sanity");
704
705 if (!JavaClasses::is_supported_for_archiving(orig_obj)) {
706 // This object has injected fields that cannot be supported easily, so we disallow them for now.
707 // If you get an error here, you probably made a change in the JDK library that has added
708 // these objects that are referenced (directly or indirectly) by static fields.
709 ResourceMark rm;
710 log_error(cds, heap)("Cannot archive object of class %s", orig_obj->klass()->external_name());
711 vm_exit(1);
712 }
740 ++_num_new_archived_objs;
741 archived_obj = archive_heap_object(orig_obj, THREAD);
742 if (archived_obj == NULL) {
743 // Skip archiving the sub-graph referenced from the current entry field.
744 ResourceMark rm;
745 log_error(cds, heap)(
746 "Cannot archive the sub-graph referenced from %s object ("
747 PTR_FORMAT ") size %d, skipped.",
748 orig_obj->klass()->external_name(), p2i(orig_obj), orig_obj->size() * HeapWordSize);
749 if (level == 1) {
750 // Don't archive a subgraph root that's too big. For archives static fields, that's OK
751 // as the Java code will take care of initializing this field dynamically.
752 return NULL;
753 } else {
754 // We don't know how to handle an object that has been archived, but some of its reachable
755 // objects cannot be archived. Bail out for now. We might need to fix this in the future if
756 // we have a real use case.
757 vm_exit(1);
758 }
759 }
760
761 if (java_lang_Module::is_instance(orig_obj)) {
762 check_module_oop(orig_obj);
763 }
764
765 if (java_lang_Module::is_instance(orig_obj)) {
766 java_lang_Module::set_module_entry(archived_obj, NULL);
767 java_lang_Module::set_loader(archived_obj, NULL);
768 } else if (java_lang_ClassLoader::is_instance(orig_obj)) {
769 // class_data will be restored explicitly at run time.
770 guarantee(orig_obj == SystemDictionary::java_platform_loader() ||
771 orig_obj == SystemDictionary::java_system_loader() ||
772 java_lang_ClassLoader::loader_data_raw(orig_obj) == NULL, "must be");
773 java_lang_ClassLoader::release_set_loader_data(archived_obj, NULL);
774 }
775 }
776
777 assert(archived_obj != NULL, "must be");
778 Klass *orig_k = orig_obj->klass();
779 Klass *relocated_k = archived_obj->klass();
780 subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
781
782 WalkOopAndArchiveClosure walker(level, is_closed_archive, record_klasses_only,
783 subgraph_info, orig_obj, archived_obj, THREAD);
784 orig_obj->oop_iterate(&walker);
785 if (is_closed_archive && orig_k->is_instance_klass()) {
786 check_closed_archive_heap_region_object(InstanceKlass::cast(orig_k), THREAD);
787 }
788 return archived_obj;
789 }
790
791 //
792 // Start from the given static field in a java mirror and archive the
793 // complete sub-graph of java heap objects that are reached directly
794 // or indirectly from the starting object by following references.
1051 // [1] Dump the subgraph of each archived field
1052 // [2] Create a list of all the class of the objects that can be reached
1053 // by any of these static fields.
1054 // At runtime, these classes are initialized before X's archived fields
1055 // are restored by HeapShared::initialize_from_archived_subgraph().
1056 int i;
1057 for (i = 0; i < num; ) {
1058 ArchivableStaticFieldInfo* info = &fields[i];
1059 const char* klass_name = info->klass_name;
1060 start_recording_subgraph(info->klass, klass_name);
1061
1062 // If you have specified consecutive fields of the same klass in
1063 // fields[], these will be archived in the same
1064 // {start_recording_subgraph ... done_recording_subgraph} pass to
1065 // save time.
1066 for (; i < num; i++) {
1067 ArchivableStaticFieldInfo* f = &fields[i];
1068 if (f->klass_name != klass_name) {
1069 break;
1070 }
1071
1072 if (!info->full_module_graph_only || MetaspaceShared::use_full_module_graph()) {
1073 archive_reachable_objects_from_static_field(f->klass, f->klass_name,
1074 f->offset, f->field_name,
1075 is_closed_archive, CHECK);
1076 }
1077 }
1078 done_recording_subgraph(info->klass, klass_name);
1079 }
1080
1081 log_info(cds, heap)("Archived subgraph records in %s archive heap region = %d",
1082 is_closed_archive ? "closed" : "open",
1083 _num_total_subgraph_recordings);
1084 log_info(cds, heap)(" Walked %d objects", _num_total_walked_objs);
1085 log_info(cds, heap)(" Archived %d objects", _num_total_archived_objs);
1086 log_info(cds, heap)(" Recorded %d klasses", _num_total_recorded_klasses);
1087
1088 #ifndef PRODUCT
1089 for (int i = 0; i < num; i++) {
1090 ArchivableStaticFieldInfo* f = &fields[i];
1091 verify_subgraph_from_static_field(f->klass, f->offset);
1092 }
1093 log_info(cds, heap)(" Verified %d references", _num_total_verifications);
1094 #endif
1095 }
1096
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