1 /*
2 * Copyright (c) 2018, 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 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "logging/log.hpp"
30 #include "logging/logMessage.hpp"
31 #include "logging/logStream.hpp"
32 #include "memory/heapShared.hpp"
33 #include "memory/iterator.inline.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/metaspaceClosure.hpp"
36 #include "memory/metaspaceShared.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/compressedOops.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "runtime/fieldDescriptor.inline.hpp"
41
42 #if INCLUDE_CDS_JAVA_HEAP
43 KlassSubGraphInfo* HeapShared::_subgraph_info_list = NULL;
44 int HeapShared::_num_archived_subgraph_info_records = 0;
45 Array<ArchivedKlassSubGraphInfoRecord>* HeapShared::_archived_subgraph_info_records = NULL;
46
47 // Currently there is only one class mirror (ArchivedModuleGraph) with archived
48 // sub-graphs.
49 KlassSubGraphInfo* HeapShared::find_subgraph_info(Klass* k) {
50 KlassSubGraphInfo* info = _subgraph_info_list;
51 while (info != NULL) {
52 if (info->klass() == k) {
53 return info;
54 }
55 info = info->next();
56 }
57 return NULL;
58 }
59
60 // Get the subgraph_info for Klass k. A new subgraph_info is created if
61 // there is no existing one for k. The subgraph_info records the relocated
62 // Klass* of the original k.
63 KlassSubGraphInfo* HeapShared::get_subgraph_info(Klass* k) {
64 Klass* relocated_k = MetaspaceShared::get_relocated_klass(k);
65 KlassSubGraphInfo* info = find_subgraph_info(relocated_k);
66 if (info != NULL) {
67 return info;
68 }
69
70 info = new KlassSubGraphInfo(relocated_k, _subgraph_info_list);
71 _subgraph_info_list = info;
72 return info;
73 }
74
75 int HeapShared::num_of_subgraph_infos() {
76 int num = 0;
77 KlassSubGraphInfo* info = _subgraph_info_list;
78 while (info != NULL) {
79 num ++;
80 info = info->next();
81 }
82 return num;
83 }
84
85 // Add an entry field to the current KlassSubGraphInfo.
86 void KlassSubGraphInfo::add_subgraph_entry_field(int static_field_offset, oop v) {
87 assert(DumpSharedSpaces, "dump time only");
88 if (_subgraph_entry_fields == NULL) {
89 _subgraph_entry_fields =
90 new(ResourceObj::C_HEAP, mtClass) GrowableArray<juint>(10, true);
91 }
92 _subgraph_entry_fields->append((juint)static_field_offset);
93 _subgraph_entry_fields->append(CompressedOops::encode(v));
94 }
95
96 // Add the Klass* for an object in the current KlassSubGraphInfo's subgraphs.
97 // Only objects of boot classes can be included in sub-graph.
98 void KlassSubGraphInfo::add_subgraph_object_klass(Klass* orig_k, Klass *relocated_k) {
99 assert(DumpSharedSpaces, "dump time only");
100 assert(relocated_k == MetaspaceShared::get_relocated_klass(orig_k),
101 "must be the relocated Klass in the shared space");
102
103 if (_subgraph_object_klasses == NULL) {
104 _subgraph_object_klasses =
105 new(ResourceObj::C_HEAP, mtClass) GrowableArray<Klass*>(50, true);
106 }
107
108 assert(relocated_k->is_shared(), "must be a shared class");
109
110 if (_k == relocated_k) {
111 // Don't add the Klass containing the sub-graph to it's own klass
112 // initialization list.
113 return;
114 }
115
116 if (relocated_k->is_instance_klass()) {
117 assert(InstanceKlass::cast(relocated_k)->is_shared_boot_class(),
118 "must be boot class");
119 // SystemDictionary::xxx_klass() are not updated, need to check
120 // the original Klass*
121 if (orig_k == SystemDictionary::String_klass() ||
122 orig_k == SystemDictionary::Object_klass()) {
123 // Initialized early during VM initialization. No need to be added
124 // to the sub-graph object class list.
125 return;
126 }
127 } else if (relocated_k->is_objArray_klass()) {
128 Klass* abk = ObjArrayKlass::cast(relocated_k)->bottom_klass();
129 if (abk->is_instance_klass()) {
130 assert(InstanceKlass::cast(abk)->is_shared_boot_class(),
131 "must be boot class");
132 }
133 if (relocated_k == Universe::objectArrayKlassObj()) {
134 // Initialized early during Universe::genesis. No need to be added
135 // to the list.
136 return;
137 }
138 } else {
139 assert(relocated_k->is_typeArray_klass(), "must be");
140 // Primitive type arrays are created early during Universe::genesis.
141 return;
142 }
143
144 _subgraph_object_klasses->append_if_missing(relocated_k);
145 }
146
147 // Initialize an archived subgraph_info_record from the given KlassSubGraphInfo.
148 void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) {
149 _k = info->klass();
150 _next = NULL;
151 _entry_field_records = NULL;
152 _subgraph_klasses = NULL;
153
154 // populate the entry fields
155 GrowableArray<juint>* entry_fields = info->subgraph_entry_fields();
156 if (entry_fields != NULL) {
157 int num_entry_fields = entry_fields->length();
158 assert(num_entry_fields % 2 == 0, "sanity");
159 _entry_field_records =
160 MetaspaceShared::new_ro_array<juint>(num_entry_fields);
161 for (int i = 0 ; i < num_entry_fields; i++) {
162 _entry_field_records->at_put(i, entry_fields->at(i));
163 }
164 }
165
166 // the Klasses of the objects in the sub-graphs
167 GrowableArray<Klass*>* subgraph_klasses = info->subgraph_object_klasses();
168 if (subgraph_klasses != NULL) {
169 int num_subgraphs_klasses = subgraph_klasses->length();
170 _subgraph_klasses =
171 MetaspaceShared::new_ro_array<Klass*>(num_subgraphs_klasses);
172 for (int i = 0; i < num_subgraphs_klasses; i++) {
173 Klass* subgraph_k = subgraph_klasses->at(i);
174 if (log_is_enabled(Info, cds, heap)) {
175 ResourceMark rm;
176 log_info(cds, heap)(
177 "Archived object klass (%d): %s in %s sub-graphs",
178 i, subgraph_k->external_name(), _k->external_name());
179 }
180 _subgraph_klasses->at_put(i, subgraph_k);
181 }
182 }
183 }
184
185 // Build the records of archived subgraph infos, which include:
186 // - Entry points to all subgraphs from the containing class mirror. The entry
187 // points are static fields in the mirror. For each entry point, the field
188 // offset and value are recorded in the sub-graph info. The value are stored
189 // back to the corresponding field at runtime.
190 // - A list of klasses that need to be loaded/initialized before archived
191 // java object sub-graph can be accessed at runtime.
192 //
193 // The records are saved in the archive file and reloaded at runtime. Currently
194 // there is only one class mirror (ArchivedModuleGraph) with archived sub-graphs.
195 //
196 // Layout of the archived subgraph info records:
197 //
198 // records_size | num_records | records*
199 // ArchivedKlassSubGraphInfoRecord | entry_fields | subgraph_object_klasses
200 size_t HeapShared::build_archived_subgraph_info_records(int num_records) {
201 // remember the start address
202 char* start_p = MetaspaceShared::read_only_space_top();
203
204 // now populate the archived subgraph infos, which will be saved in the
205 // archive file
206 _archived_subgraph_info_records =
207 MetaspaceShared::new_ro_array<ArchivedKlassSubGraphInfoRecord>(num_records);
208 KlassSubGraphInfo* info = _subgraph_info_list;
209 int i = 0;
210 while (info != NULL) {
211 assert(i < _archived_subgraph_info_records->length(), "sanity");
212 ArchivedKlassSubGraphInfoRecord* record =
213 _archived_subgraph_info_records->adr_at(i);
214 record->init(info);
215 info = info->next();
216 i ++;
217 }
218
219 // _subgraph_info_list is no longer needed
220 delete _subgraph_info_list;
221 _subgraph_info_list = NULL;
222
223 char* end_p = MetaspaceShared::read_only_space_top();
224 size_t records_size = end_p - start_p;
225 return records_size;
226 }
227
228 // Write the subgraph info records in the shared _ro region
229 void HeapShared::write_archived_subgraph_infos() {
230 assert(DumpSharedSpaces, "dump time only");
231
232 Array<intptr_t>* records_header = MetaspaceShared::new_ro_array<intptr_t>(3);
233
234 _num_archived_subgraph_info_records = num_of_subgraph_infos();
235 size_t records_size = build_archived_subgraph_info_records(
236 _num_archived_subgraph_info_records);
237
238 // Now write the header information:
239 // records_size, num_records, _archived_subgraph_info_records
240 assert(records_header != NULL, "sanity");
241 intptr_t* p = (intptr_t*)(records_header->data());
242 *p = (intptr_t)records_size;
243 p ++;
244 *p = (intptr_t)_num_archived_subgraph_info_records;
245 p ++;
246 *p = (intptr_t)_archived_subgraph_info_records;
247 }
248
249 char* HeapShared::read_archived_subgraph_infos(char* buffer) {
250 Array<intptr_t>* records_header = (Array<intptr_t>*)buffer;
251 intptr_t* p = (intptr_t*)(records_header->data());
252 size_t records_size = (size_t)(*p);
253 p ++;
254 _num_archived_subgraph_info_records = *p;
255 p ++;
256 _archived_subgraph_info_records =
257 (Array<ArchivedKlassSubGraphInfoRecord>*)(*p);
258
259 buffer = (char*)_archived_subgraph_info_records + records_size;
260 return buffer;
261 }
262
263 void HeapShared::initialize_from_archived_subgraph(Klass* k) {
264 if (!MetaspaceShared::open_archive_heap_region_mapped()) {
265 return; // nothing to do
266 }
267
268 if (_num_archived_subgraph_info_records == 0) {
269 return; // no subgraph info records
270 }
271
272 // Initialize from archived data. Currently only ArchivedModuleGraph
273 // has archived object subgraphs, which is used during VM initialization
274 // time when bootstraping the system modules. No lock is needed.
275 Thread* THREAD = Thread::current();
276 for (int i = 0; i < _archived_subgraph_info_records->length(); i++) {
277 ArchivedKlassSubGraphInfoRecord* record = _archived_subgraph_info_records->adr_at(i);
278 if (record->klass() == k) {
279 int i;
280 // Found the archived subgraph info record for the requesting klass.
281 // Load/link/initialize the klasses of the objects in the subgraph.
282 // NULL class loader is used.
283 Array<Klass*>* klasses = record->subgraph_klasses();
284 if (klasses != NULL) {
285 for (i = 0; i < klasses->length(); i++) {
286 Klass* obj_k = klasses->at(i);
287 Klass* resolved_k = SystemDictionary::resolve_or_null(
288 (obj_k)->name(), THREAD);
289 if (resolved_k != obj_k) {
290 return;
291 }
292 if ((obj_k)->is_instance_klass()) {
293 InstanceKlass* ik = InstanceKlass::cast(obj_k);
294 ik->initialize(THREAD);
295 } else if ((obj_k)->is_objArray_klass()) {
296 ObjArrayKlass* oak = ObjArrayKlass::cast(obj_k);
297 oak->initialize(THREAD);
298 }
299 }
300 }
301
302 if (HAS_PENDING_EXCEPTION) {
303 CLEAR_PENDING_EXCEPTION;
304 // None of the field value will be set if there was an exception.
305 // The java code will not see any of the archived objects in the
306 // subgraphs referenced from k in this case.
307 return;
308 }
309
310 // Load the subgraph entry fields from the record and store them back to
311 // the corresponding fields within the mirror.
312 oop m = k->java_mirror();
313 Array<juint>* entry_field_records = record->entry_field_records();
314 if (entry_field_records != NULL) {
315 int efr_len = entry_field_records->length();
316 assert(efr_len % 2 == 0, "sanity");
317 for (i = 0; i < efr_len;) {
318 int field_offset = entry_field_records->at(i);
319 // The object refereced by the field becomes 'known' by GC from this
320 // point. All objects in the subgraph reachable from the object are
321 // also 'known' by GC.
322 oop v = MetaspaceShared::materialize_archived_object(
323 CompressedOops::decode(entry_field_records->at(i+1)));
324 m->obj_field_put(field_offset, v);
325 i += 2;
326 }
327 }
328
329 // Done. Java code can see the archived sub-graphs referenced from k's
330 // mirror after this point.
331 return;
332 }
333 }
334 }
335
336 class WalkOopAndArchiveClosure: public BasicOopIterateClosure {
337 int _level;
338 KlassSubGraphInfo* _subgraph_info;
339 oop _orig_referencing_obj;
340 oop _archived_referencing_obj;
341 public:
342 WalkOopAndArchiveClosure(int level, KlassSubGraphInfo* subgraph_info,
343 oop orig, oop archived) : _level(level),
344 _subgraph_info(subgraph_info),
345 _orig_referencing_obj(orig),
346 _archived_referencing_obj(archived) {}
347 void do_oop(narrowOop *p) { WalkOopAndArchiveClosure::do_oop_work(p); }
348 void do_oop( oop *p) { WalkOopAndArchiveClosure::do_oop_work(p); }
349
350 protected:
351 template <class T> void do_oop_work(T *p) {
352 oop obj = RawAccess<>::oop_load(p);
353 if (!CompressedOops::is_null(obj)) {
354 // A java.lang.Class instance can not be included in an archived
355 // object sub-graph.
356 if (java_lang_Class::is_instance(obj)) {
357 log_error(cds, heap)("Unknown java.lang.Class object is in the archived sub-graph\n");
358 vm_exit(1);
359 }
360
361 LogTarget(Debug, cds, heap) log;
362 LogStream ls(log);
363 outputStream* out = &ls;
364 {
365 ResourceMark rm;
366 log.print("(%d) %s <--- referenced from: %s",
367 _level, obj->klass()->external_name(),
368 CompressedOops::is_null(_orig_referencing_obj) ?
369 "" : _orig_referencing_obj->klass()->external_name());
370 obj->print_on(out);
371 }
372
373 if (MetaspaceShared::is_archive_object(obj)) {
374 // The current oop is an archived oop, nothing needs to be done
375 log.print("--- object is already archived ---");
376 return;
377 }
378
379 size_t field_delta = pointer_delta(
380 p, _orig_referencing_obj, sizeof(char));
381 T* new_p = (T*)(address(_archived_referencing_obj) + field_delta);
382 oop archived = MetaspaceShared::find_archived_heap_object(obj);
383 if (archived != NULL) {
384 // There is an archived copy existing, update reference to point
385 // to the archived copy
386 RawAccess<IS_NOT_NULL>::oop_store(new_p, archived);
387 log.print(
388 "--- found existing archived copy, store archived " PTR_FORMAT " in " PTR_FORMAT,
389 p2i(archived), p2i(new_p));
390 return;
391 }
392
393 int l = _level + 1;
394 Thread* THREAD = Thread::current();
395 // Archive the current oop before iterating through its references
396 archived = MetaspaceShared::archive_heap_object(obj, THREAD);
397 if (archived == NULL) {
398 ResourceMark rm;
399 LogTarget(Error, cds, heap) log_err;
400 LogStream ls_err(log_err);
401 outputStream* out_err = &ls_err;
402 log_err.print("Failed to archive %s object ("
403 PTR_FORMAT "), size[" SIZE_FORMAT "] in sub-graph",
404 obj->klass()->external_name(), p2i(obj), (size_t)obj->size());
405 obj->print_on(out_err);
406 vm_exit(1);
407 }
408 assert(MetaspaceShared::is_archive_object(archived), "must be archived");
409 log.print("=== archiving oop " PTR_FORMAT " ==> " PTR_FORMAT,
410 p2i(obj), p2i(archived));
411
412 // Following the references in the current oop and archive any
413 // encountered objects during the process
414 WalkOopAndArchiveClosure walker(l, _subgraph_info, obj, archived);
415 obj->oop_iterate(&walker);
416
417 // Update the reference in the archived copy of the referencing object
418 RawAccess<IS_NOT_NULL>::oop_store(new_p, archived);
419 log.print("=== store archived " PTR_FORMAT " in " PTR_FORMAT,
420 p2i(archived), p2i(new_p));
421
422 // Add the klass to the list of classes that need to be loaded before
423 // module system initialization
424 Klass *orig_k = obj->klass();
425 Klass *relocated_k = archived->klass();
426 _subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
427 }
428 }
429 };
430
431 //
432 // Start from the given static field in a java mirror and archive the
433 // complete sub-graph of java heap objects that are reached directly
434 // or indirectly from the starting object by following references.
435 // Currently, only ArchivedModuleGraph class instance (mirror) has archived
436 // object subgraphs. Sub-graph archiving restrictions (current):
437 //
438 // - All classes of objects in the archived sub-graph (including the
439 // entry class) must be boot class only.
440 // - No java.lang.Class instance (java mirror) can be included inside
441 // an archived sub-graph. Mirror can only be the sub-graph entry object.
442 //
443 // The Java heap object sub-graph archiving process (see
444 // WalkOopAndArchiveClosure):
445 //
446 // 1) Java object sub-graph archiving starts from a given static field
447 // within a Class instance (java mirror). If the static field is a
448 // refererence field and points to a non-null java object, proceed to
449 // the next step.
450 //
451 // 2) Archives the referenced java object. If an archived copy of the
452 // current object already exists, updates the pointer in the archived
453 // copy of the referencing object to point to the current archived object.
454 // Otherwise, proceed to the next step.
455 //
456 // 3) Follows all references within the current java object and recursively
457 // archive the sub-graph of objects starting from each reference.
458 //
459 // 4) Updates the pointer in the archived copy of referencing object to
460 // point to the current archived object.
461 //
462 // 5) The Klass of the current java object is added to the list of Klasses
463 // for loading and initialzing before any object in the archived graph can
464 // be accessed at runtime.
465 //
466 void HeapShared::archive_reachable_objects_from_static_field(Klass *k,
467 int field_offset,
468 BasicType field_type,
469 TRAPS) {
470 assert(DumpSharedSpaces, "dump time only");
471 assert(k->is_instance_klass(), "sanity");
472 assert(InstanceKlass::cast(k)->is_shared_boot_class(),
473 "must be boot class");
474
475 oop m = k->java_mirror();
476 oop archived_m = MetaspaceShared::find_archived_heap_object(m);
477 if (CompressedOops::is_null(archived_m)) {
478 return;
479 }
480
481 if (field_type == T_OBJECT || field_type == T_ARRAY) {
482 // obtain k's subGraph Info
483 KlassSubGraphInfo* subgraph_info = get_subgraph_info(k);
484
485 // get the object referenced by the field
486 oop f = m->obj_field(field_offset);
487 if (!CompressedOops::is_null(f)) {
488 LogTarget(Debug, cds, heap) log;
489 LogStream ls(log);
490 outputStream* out = &ls;
491 log.print("Start from: ");
492 f->print_on(out);
493
494 // get the archived copy of the field referenced object
495 oop af = MetaspaceShared::archive_heap_object(f, THREAD);
496 if (af == NULL) {
497 // Skip archiving the sub-graph referenced from the current entry field.
498 ResourceMark rm;
499 log_info(cds, heap)(
500 "Cannot archive the sub-graph referenced from %s object ("
501 PTR_FORMAT ") size[" SIZE_FORMAT "], skipped.",
502 f->klass()->external_name(), p2i(f), (size_t)f->size());
503 return;
504 }
505 if (!MetaspaceShared::is_archive_object(f)) {
506 WalkOopAndArchiveClosure walker(1, subgraph_info, f, af);
507 f->oop_iterate(&walker);
508 }
509
510 // The field value is not preserved in the archived mirror.
511 // Record the field as a new subGraph entry point. The recorded
512 // information is restored from the archive at runtime.
513 subgraph_info->add_subgraph_entry_field(field_offset, af);
514 Klass *relocated_k = af->klass();
515 Klass *orig_k = f->klass();
516 subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
517 ResourceMark rm;
518 log_info(cds, heap)(
519 "Archived the sub-graph referenced from %s object " PTR_FORMAT,
520 f->klass()->external_name(), p2i(f));
521 } else {
522 // The field contains null, we still need to record the entry point,
523 // so it can be restored at runtime.
524 subgraph_info->add_subgraph_entry_field(field_offset, NULL);
525 }
526 } else {
527 ShouldNotReachHere();
528 }
529 }
530
531 struct ArchivableStaticFieldInfo {
532 const char* class_name;
533 const char* field_name;
534 InstanceKlass* klass;
535 int offset;
536 BasicType type;
537 };
538
539 // If you add new entries to this table, you should know what you're doing!
540 static ArchivableStaticFieldInfo archivable_static_fields[] = {
541 {"jdk/internal/module/ArchivedModuleGraph", "archivedSystemModules"},
542 {"jdk/internal/module/ArchivedModuleGraph", "archivedModuleFinder"},
543 {"jdk/internal/module/ArchivedModuleGraph", "archivedMainModule"},
544 {"jdk/internal/module/ArchivedModuleGraph", "archivedConfiguration"},
545 {"java/util/ImmutableCollections$ListN", "EMPTY_LIST"},
546 {"java/util/ImmutableCollections$MapN", "EMPTY_MAP"},
547 {"java/util/ImmutableCollections$SetN", "EMPTY_SET"},
548 {"java/lang/Integer$IntegerCache", "archivedCache"},
549 {"java/lang/module/Configuration", "EMPTY_CONFIGURATION"},
550 };
551
552 const static int num_archivable_static_fields = sizeof(archivable_static_fields) / sizeof(ArchivableStaticFieldInfo);
553
554 class ArchivableStaticFieldFinder: public FieldClosure {
555 InstanceKlass* _ik;
556 Symbol* _field_name;
557 bool _found;
558 int _offset;
559 BasicType _type;
560 public:
561 ArchivableStaticFieldFinder(InstanceKlass* ik, Symbol* field_name) :
562 _ik(ik), _field_name(field_name), _found(false), _offset(-1), _type(T_ILLEGAL) {}
563
564 virtual void do_field(fieldDescriptor* fd) {
565 if (fd->name() == _field_name) {
566 assert(!_found, "fields cannot be overloaded");
567 _found = true;
568 _offset = fd->offset();
569 _type = fd->field_type();
570 assert(_type == T_OBJECT || _type == T_ARRAY, "can archive only obj or array fields");
571 }
572 }
573 bool found() { return _found; }
574 int offset() { return _offset; }
575 BasicType type() { return _type; }
576 };
577
578 void HeapShared::init_archivable_static_fields(Thread* THREAD) {
579 for (int i = 0; i < num_archivable_static_fields; i++) {
580 ArchivableStaticFieldInfo* info = &archivable_static_fields[i];
581 TempNewSymbol class_name = SymbolTable::new_symbol(info->class_name, THREAD);
582 TempNewSymbol field_name = SymbolTable::new_symbol(info->field_name, THREAD);
583
584 Klass* k = SystemDictionary::resolve_or_null(class_name, THREAD);
585 assert(k != NULL && !HAS_PENDING_EXCEPTION, "class must exist");
586 InstanceKlass* ik = InstanceKlass::cast(k);
587
588 ArchivableStaticFieldFinder finder(ik, field_name);
589 ik->do_local_static_fields(&finder);
590 assert(finder.found(), "field must exist");
591
592 info->klass = ik;
593 info->offset = finder.offset();
594 info->type = finder.type();
595 }
596 }
597
598 void HeapShared::archive_module_graph_objects(Thread* THREAD) {
599 for (int i = 0; i < num_archivable_static_fields; i++) {
600 ArchivableStaticFieldInfo* info = &archivable_static_fields[i];
601 archive_reachable_objects_from_static_field(info->klass, info->offset, info->type, CHECK);
602 }
603 }
604 #endif // INCLUDE_CDS_JAVA_HEAP