1 /*
2 * Copyright (c) 2018, 2021, 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 "cds/archiveBuilder.hpp"
27 #include "cds/archiveUtils.hpp"
28 #include "cds/filemap.hpp"
29 #include "cds/heapShared.inline.hpp"
30 #include "cds/metaspaceShared.hpp"
31 #include "classfile/classLoaderData.hpp"
32 #include "classfile/classLoaderDataShared.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/systemDictionaryShared.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "gc/shared/collectedHeap.hpp"
42 #include "gc/shared/gcLocker.hpp"
43 #include "gc/shared/gcVMOperations.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logMessage.hpp"
46 #include "logging/logStream.hpp"
47 #include "memory/iterator.inline.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/metaspaceClosure.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/compressedOops.inline.hpp"
53 #include "oops/fieldStreams.inline.hpp"
54 #include "oops/objArrayOop.hpp"
55 #include "oops/oop.inline.hpp"
56 #include "prims/jvmtiExport.hpp"
57 #include "runtime/fieldDescriptor.inline.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/init.hpp"
60 #include "runtime/java.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/safepointVerifiers.hpp"
63 #include "utilities/bitMap.inline.hpp"
64 #include "utilities/copy.hpp"
65 #if INCLUDE_G1GC
66 #include "gc/g1/g1CollectedHeap.hpp"
67 #endif
68
69 #if INCLUDE_CDS_JAVA_HEAP
70
71 bool HeapShared::_closed_regions_mapped = false;
72 bool HeapShared::_open_regions_mapped = false;
73 bool HeapShared::_is_loaded = false;
74 address HeapShared::_narrow_oop_base;
75 int HeapShared::_narrow_oop_shift;
76 DumpedInternedStrings *HeapShared::_dumped_interned_strings = NULL;
77
78 uintptr_t HeapShared::_loaded_heap_bottom = 0;
79 uintptr_t HeapShared::_loaded_heap_top = 0;
80 uintptr_t HeapShared::_dumptime_base_0 = UINTPTR_MAX;
81 uintptr_t HeapShared::_dumptime_base_1 = UINTPTR_MAX;
82 uintptr_t HeapShared::_dumptime_base_2 = UINTPTR_MAX;
83 uintptr_t HeapShared::_dumptime_base_3 = UINTPTR_MAX;
84 uintptr_t HeapShared::_dumptime_top = 0;
85 intx HeapShared::_runtime_offset_0 = 0;
86 intx HeapShared::_runtime_offset_1 = 0;
87 intx HeapShared::_runtime_offset_2 = 0;
88 intx HeapShared::_runtime_offset_3 = 0;
89 bool HeapShared::_loading_failed = false;
90 //
91 // If you add new entries to the following tables, you should know what you're doing!
92 //
93
94 // Entry fields for shareable subgraphs archived in the closed archive heap
95 // region. Warning: Objects in the subgraphs should not have reference fields
96 // assigned at runtime.
97 static ArchivableStaticFieldInfo closed_archive_subgraph_entry_fields[] = {
98 {"java/lang/Integer$IntegerCache", "archivedCache"},
99 {"java/lang/Long$LongCache", "archivedCache"},
100 {"java/lang/Byte$ByteCache", "archivedCache"},
101 {"java/lang/Short$ShortCache", "archivedCache"},
102 {"java/lang/Character$CharacterCache", "archivedCache"},
103 {"java/util/jar/Attributes$Name", "KNOWN_NAMES"},
104 {"sun/util/locale/BaseLocale", "constantBaseLocales"},
105 };
106 // Entry fields for subgraphs archived in the open archive heap region.
107 static ArchivableStaticFieldInfo open_archive_subgraph_entry_fields[] = {
108 {"jdk/internal/module/ArchivedModuleGraph", "archivedModuleGraph"},
109 {"java/util/ImmutableCollections", "archivedObjects"},
110 {"java/lang/ModuleLayer", "EMPTY_LAYER"},
111 {"java/lang/module/Configuration", "EMPTY_CONFIGURATION"},
112 {"jdk/internal/math/FDBigInteger", "archivedCaches"},
113 };
114
115 // Entry fields for subgraphs archived in the open archive heap region (full module graph).
116 static ArchivableStaticFieldInfo fmg_open_archive_subgraph_entry_fields[] = {
117 {"jdk/internal/loader/ArchivedClassLoaders", "archivedClassLoaders"},
118 {"jdk/internal/module/ArchivedBootLayer", "archivedBootLayer"},
119 {"java/lang/Module$ArchivedData", "archivedData"},
120 };
121
122 const static int num_closed_archive_subgraph_entry_fields =
123 sizeof(closed_archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo);
124 const static int num_open_archive_subgraph_entry_fields =
125 sizeof(open_archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo);
126 const static int num_fmg_open_archive_subgraph_entry_fields =
127 sizeof(fmg_open_archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo);
128
129 GrowableArrayCHeap<oop, mtClassShared>* HeapShared::_pending_roots = NULL;
130 narrowOop HeapShared::_roots_narrow;
131 OopHandle HeapShared::_roots;
132
133 #ifdef ASSERT
134 bool HeapShared::is_archived_object_during_dumptime(oop p) {
135 assert(HeapShared::can_write(), "must be");
136 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
137 return Universe::heap()->is_archived_object(p);
138 }
139 #endif
140
141 ////////////////////////////////////////////////////////////////
142 //
143 // Java heap object archiving support
144 //
145 ////////////////////////////////////////////////////////////////
146 void HeapShared::fixup_regions() {
147 FileMapInfo* mapinfo = FileMapInfo::current_info();
148 if (is_mapped()) {
149 mapinfo->fixup_mapped_heap_regions();
150 } else if (_loading_failed) {
151 fill_failed_loaded_region();
152 }
153 if (is_fully_available()) {
154 _roots = OopHandle(Universe::vm_global(), decode_from_archive(_roots_narrow));
155 if (!MetaspaceShared::use_full_module_graph()) {
156 // Need to remove all the archived java.lang.Module objects from HeapShared::roots().
157 ClassLoaderDataShared::clear_archived_oops();
158 }
159 }
160 SystemDictionaryShared::update_archived_mirror_native_pointers();
161 }
162
163 unsigned HeapShared::oop_hash(oop const& p) {
164 unsigned hash = (unsigned)p->identity_hash();
165 return hash;
166 }
167
168 static void reset_states(oop obj, TRAPS) {
169 Handle h_obj(THREAD, obj);
170 InstanceKlass* klass = InstanceKlass::cast(obj->klass());
171 TempNewSymbol method_name = SymbolTable::new_symbol("resetArchivedStates");
172 Symbol* method_sig = vmSymbols::void_method_signature();
173
174 while (klass != NULL) {
175 Method* method = klass->find_method(method_name, method_sig);
176 if (method != NULL) {
177 assert(method->is_private(), "must be");
178 if (log_is_enabled(Debug, cds)) {
179 ResourceMark rm(THREAD);
180 log_debug(cds)(" calling %s", method->name_and_sig_as_C_string());
181 }
182 JavaValue result(T_VOID);
183 JavaCalls::call_special(&result, h_obj, klass,
184 method_name, method_sig, CHECK);
185 }
186 klass = klass->java_super();
187 }
188 }
189
190 void HeapShared::reset_archived_object_states(TRAPS) {
191 assert(DumpSharedSpaces, "dump-time only");
192 log_debug(cds)("Resetting platform loader");
193 reset_states(SystemDictionary::java_platform_loader(), CHECK);
194 log_debug(cds)("Resetting system loader");
195 reset_states(SystemDictionary::java_system_loader(), CHECK);
196 }
197
198 HeapShared::ArchivedObjectCache* HeapShared::_archived_object_cache = NULL;
199 oop HeapShared::find_archived_heap_object(oop obj) {
200 assert(DumpSharedSpaces, "dump-time only");
201 ArchivedObjectCache* cache = archived_object_cache();
202 oop* p = cache->get(obj);
203 if (p != NULL) {
204 return *p;
205 } else {
206 return NULL;
207 }
208 }
209
210 int HeapShared::append_root(oop obj) {
211 assert(DumpSharedSpaces, "dump-time only");
212
213 // No GC should happen since we aren't scanning _pending_roots.
214 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread");
215
216 if (_pending_roots == NULL) {
217 _pending_roots = new GrowableArrayCHeap<oop, mtClassShared>(500);
218 }
219
220 return _pending_roots->append(obj);
221 }
222
223 objArrayOop HeapShared::roots() {
224 if (DumpSharedSpaces) {
225 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread");
226 if (!HeapShared::can_write()) {
227 return NULL;
228 }
229 } else {
230 assert(UseSharedSpaces, "must be");
231 }
232
233 objArrayOop roots = (objArrayOop)_roots.resolve();
234 assert(roots != NULL, "should have been initialized");
235 return roots;
236 }
237
238 void HeapShared::set_roots(narrowOop roots) {
239 assert(UseSharedSpaces, "runtime only");
240 assert(is_fully_available(), "must be");
241 _roots_narrow = roots;
242 }
243
244 // Returns an objArray that contains all the roots of the archived objects
245 oop HeapShared::get_root(int index, bool clear) {
246 assert(index >= 0, "sanity");
247 if (DumpSharedSpaces) {
248 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread");
249 assert(_pending_roots != NULL, "sanity");
250 return _pending_roots->at(index);
251 } else {
252 assert(UseSharedSpaces, "must be");
253 assert(!_roots.is_empty(), "must have loaded shared heap");
254 oop result = roots()->obj_at(index);
255 if (clear) {
256 clear_root(index);
257 }
258 return result;
259 }
260 }
261
262 void HeapShared::clear_root(int index) {
263 assert(index >= 0, "sanity");
264 assert(UseSharedSpaces, "must be");
265 if (is_fully_available()) {
266 if (log_is_enabled(Debug, cds, heap)) {
267 oop old = roots()->obj_at(index);
268 log_debug(cds, heap)("Clearing root %d: was " PTR_FORMAT, index, p2i(old));
269 }
270 roots()->obj_at_put(index, NULL);
271 }
272 }
273
274 oop HeapShared::archive_object(oop obj) {
275 assert(DumpSharedSpaces, "dump-time only");
276
277 oop ao = find_archived_heap_object(obj);
278 if (ao != NULL) {
279 // already archived
280 return ao;
281 }
282
283 int len = obj->size();
284 if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) {
285 log_debug(cds, heap)("Cannot archive, object (" PTR_FORMAT ") is too large: " SIZE_FORMAT,
286 p2i(obj), (size_t)obj->size());
287 return NULL;
288 }
289
290 oop archived_oop = cast_to_oop(G1CollectedHeap::heap()->archive_mem_allocate(len));
291 if (archived_oop != NULL) {
292 Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(obj), cast_from_oop<HeapWord*>(archived_oop), len);
293 // Reinitialize markword to remove age/marking/locking/etc.
294 //
295 // We need to retain the identity_hash, because it may have been used by some hashtables
296 // in the shared heap. This also has the side effect of pre-initializing the
297 // identity_hash for all shared objects, so they are less likely to be written
298 // into during run time, increasing the potential of memory sharing.
299 int hash_original = obj->identity_hash();
300 archived_oop->set_mark(markWord::prototype().copy_set_hash(hash_original));
301 assert(archived_oop->mark().is_unlocked(), "sanity");
302
303 DEBUG_ONLY(int hash_archived = archived_oop->identity_hash());
304 assert(hash_original == hash_archived, "Different hash codes: original %x, archived %x", hash_original, hash_archived);
305
306 ArchivedObjectCache* cache = archived_object_cache();
307 cache->put(obj, archived_oop);
308 if (log_is_enabled(Debug, cds, heap)) {
309 ResourceMark rm;
310 log_debug(cds, heap)("Archived heap object " PTR_FORMAT " ==> " PTR_FORMAT " : %s",
311 p2i(obj), p2i(archived_oop), obj->klass()->external_name());
312 }
313 } else {
314 log_error(cds, heap)(
315 "Cannot allocate space for object " PTR_FORMAT " in archived heap region",
316 p2i(obj));
317 vm_direct_exit(-1,
318 err_msg("Out of memory. Please run with a larger Java heap, current MaxHeapSize = "
319 SIZE_FORMAT "M", MaxHeapSize/M));
320 }
321 return archived_oop;
322 }
323
324 void HeapShared::archive_klass_objects() {
325 GrowableArray<Klass*>* klasses = ArchiveBuilder::current()->klasses();
326 assert(klasses != NULL, "sanity");
327 for (int i = 0; i < klasses->length(); i++) {
328 Klass* k = ArchiveBuilder::get_relocated_klass(klasses->at(i));
329
330 // archive mirror object
331 java_lang_Class::archive_mirror(k);
332
333 // archive the resolved_referenes array
334 if (k->is_instance_klass()) {
335 InstanceKlass* ik = InstanceKlass::cast(k);
336 ik->constants()->archive_resolved_references();
337 }
338 }
339 }
340
341 void HeapShared::run_full_gc_in_vm_thread() {
342 if (HeapShared::can_write()) {
343 // Avoid fragmentation while archiving heap objects.
344 // We do this inside a safepoint, so that no further allocation can happen after GC
345 // has finished.
346 if (GCLocker::is_active()) {
347 // Just checking for safety ...
348 // This should not happen during -Xshare:dump. If you see this, probably the Java core lib
349 // has been modified such that JNI code is executed in some clean up threads after
350 // we have finished class loading.
351 log_warning(cds)("GC locker is held, unable to start extra compacting GC. This may produce suboptimal results.");
352 } else {
353 log_info(cds)("Run GC ...");
354 Universe::heap()->collect_as_vm_thread(GCCause::_archive_time_gc);
355 log_info(cds)("Run GC done");
356 }
357 }
358 }
359
360 void HeapShared::archive_objects(GrowableArray<MemRegion>* closed_regions,
361 GrowableArray<MemRegion>* open_regions) {
362
363 G1HeapVerifier::verify_ready_for_archiving();
364
365 {
366 NoSafepointVerifier nsv;
367
368 // Cache for recording where the archived objects are copied to
369 create_archived_object_cache();
370
371 log_info(cds)("Heap range = [" PTR_FORMAT " - " PTR_FORMAT "]",
372 p2i(CompressedOops::begin()), p2i(CompressedOops::end()));
373 log_info(cds)("Dumping objects to closed archive heap region ...");
374 copy_closed_objects(closed_regions);
375
376 log_info(cds)("Dumping objects to open archive heap region ...");
377 copy_open_objects(open_regions);
378
379 destroy_archived_object_cache();
380 }
381
382 G1HeapVerifier::verify_archive_regions();
383 }
384
385 void HeapShared::copy_closed_objects(GrowableArray<MemRegion>* closed_regions) {
386 assert(HeapShared::can_write(), "must be");
387
388 G1CollectedHeap::heap()->begin_archive_alloc_range();
389
390 // Archive interned string objects
391 StringTable::write_to_archive(_dumped_interned_strings);
392
393 archive_object_subgraphs(closed_archive_subgraph_entry_fields,
394 num_closed_archive_subgraph_entry_fields,
395 true /* is_closed_archive */,
396 false /* is_full_module_graph */);
397
398 G1CollectedHeap::heap()->end_archive_alloc_range(closed_regions,
399 os::vm_allocation_granularity());
400 }
401
402 void HeapShared::copy_open_objects(GrowableArray<MemRegion>* open_regions) {
403 assert(HeapShared::can_write(), "must be");
404
405 G1CollectedHeap::heap()->begin_archive_alloc_range(true /* open */);
406
407 java_lang_Class::archive_basic_type_mirrors();
408
409 archive_klass_objects();
410
411 archive_object_subgraphs(open_archive_subgraph_entry_fields,
412 num_open_archive_subgraph_entry_fields,
413 false /* is_closed_archive */,
414 false /* is_full_module_graph */);
415 if (MetaspaceShared::use_full_module_graph()) {
416 archive_object_subgraphs(fmg_open_archive_subgraph_entry_fields,
417 num_fmg_open_archive_subgraph_entry_fields,
418 false /* is_closed_archive */,
419 true /* is_full_module_graph */);
420 ClassLoaderDataShared::init_archived_oops();
421 }
422
423 copy_roots();
424
425 G1CollectedHeap::heap()->end_archive_alloc_range(open_regions,
426 os::vm_allocation_granularity());
427 }
428
429 // Copy _pending_archive_roots into an objArray
430 void HeapShared::copy_roots() {
431 int length = _pending_roots != NULL ? _pending_roots->length() : 0;
432 int size = objArrayOopDesc::object_size(length);
433 Klass* k = Universe::objectArrayKlassObj(); // already relocated to point to archived klass
434 HeapWord* mem = G1CollectedHeap::heap()->archive_mem_allocate(size);
435
436 memset(mem, 0, size * BytesPerWord);
437 {
438 // This is copied from MemAllocator::finish
439 oopDesc::set_mark(mem, markWord::prototype());
440 oopDesc::release_set_klass(mem, k);
441 }
442 {
443 // This is copied from ObjArrayAllocator::initialize
444 arrayOopDesc::set_length(mem, length);
445 }
446
447 _roots = OopHandle(Universe::vm_global(), cast_to_oop(mem));
448 for (int i = 0; i < length; i++) {
449 roots()->obj_at_put(i, _pending_roots->at(i));
450 }
451 log_info(cds)("archived obj roots[%d] = %d words, klass = %p, obj = %p", length, size, k, mem);
452 }
453
454 void HeapShared::init_narrow_oop_decoding(address base, int shift) {
455 _narrow_oop_base = base;
456 _narrow_oop_shift = shift;
457 }
458
459 //
460 // Subgraph archiving support
461 //
462 HeapShared::DumpTimeKlassSubGraphInfoTable* HeapShared::_dump_time_subgraph_info_table = NULL;
463 HeapShared::RunTimeKlassSubGraphInfoTable HeapShared::_run_time_subgraph_info_table;
464
465 // Get the subgraph_info for Klass k. A new subgraph_info is created if
466 // there is no existing one for k. The subgraph_info records the relocated
467 // Klass* of the original k.
468 KlassSubGraphInfo* HeapShared::init_subgraph_info(Klass* k, bool is_full_module_graph) {
469 assert(DumpSharedSpaces, "dump time only");
470 bool created;
471 Klass* relocated_k = ArchiveBuilder::get_relocated_klass(k);
472 KlassSubGraphInfo* info =
473 _dump_time_subgraph_info_table->put_if_absent(relocated_k, KlassSubGraphInfo(relocated_k, is_full_module_graph),
474 &created);
475 assert(created, "must not initialize twice");
476 return info;
477 }
478
479 KlassSubGraphInfo* HeapShared::get_subgraph_info(Klass* k) {
480 assert(DumpSharedSpaces, "dump time only");
481 Klass* relocated_k = ArchiveBuilder::get_relocated_klass(k);
482 KlassSubGraphInfo* info = _dump_time_subgraph_info_table->get(relocated_k);
483 assert(info != NULL, "must have been initialized");
484 return info;
485 }
486
487 // Add an entry field to the current KlassSubGraphInfo.
488 void KlassSubGraphInfo::add_subgraph_entry_field(
489 int static_field_offset, oop v, bool is_closed_archive) {
490 assert(DumpSharedSpaces, "dump time only");
491 if (_subgraph_entry_fields == NULL) {
492 _subgraph_entry_fields =
493 new(ResourceObj::C_HEAP, mtClass) GrowableArray<int>(10, mtClass);
494 }
495 _subgraph_entry_fields->append(static_field_offset);
496 _subgraph_entry_fields->append(HeapShared::append_root(v));
497 }
498
499 // Add the Klass* for an object in the current KlassSubGraphInfo's subgraphs.
500 // Only objects of boot classes can be included in sub-graph.
501 void KlassSubGraphInfo::add_subgraph_object_klass(Klass* orig_k) {
502 assert(DumpSharedSpaces, "dump time only");
503 Klass* relocated_k = ArchiveBuilder::get_relocated_klass(orig_k);
504
505 if (_subgraph_object_klasses == NULL) {
506 _subgraph_object_klasses =
507 new(ResourceObj::C_HEAP, mtClass) GrowableArray<Klass*>(50, mtClass);
508 }
509
510 assert(ArchiveBuilder::current()->is_in_buffer_space(relocated_k), "must be a shared class");
511
512 if (_k == relocated_k) {
513 // Don't add the Klass containing the sub-graph to it's own klass
514 // initialization list.
515 return;
516 }
517
518 if (relocated_k->is_instance_klass()) {
519 assert(InstanceKlass::cast(relocated_k)->is_shared_boot_class(),
520 "must be boot class");
521 // vmClasses::xxx_klass() are not updated, need to check
522 // the original Klass*
523 if (orig_k == vmClasses::String_klass() ||
524 orig_k == vmClasses::Object_klass()) {
525 // Initialized early during VM initialization. No need to be added
526 // to the sub-graph object class list.
527 return;
528 }
529 } else if (relocated_k->is_objArray_klass()) {
530 Klass* abk = ObjArrayKlass::cast(relocated_k)->bottom_klass();
531 if (abk->is_instance_klass()) {
532 assert(InstanceKlass::cast(abk)->is_shared_boot_class(),
533 "must be boot class");
534 }
535 if (relocated_k == Universe::objectArrayKlassObj()) {
536 // Initialized early during Universe::genesis. No need to be added
537 // to the list.
538 return;
539 }
540 } else {
541 assert(relocated_k->is_typeArray_klass(), "must be");
542 // Primitive type arrays are created early during Universe::genesis.
543 return;
544 }
545
546 if (log_is_enabled(Debug, cds, heap)) {
547 if (!_subgraph_object_klasses->contains(relocated_k)) {
548 ResourceMark rm;
549 log_debug(cds, heap)("Adding klass %s", orig_k->external_name());
550 }
551 }
552
553 _subgraph_object_klasses->append_if_missing(relocated_k);
554 _has_non_early_klasses |= is_non_early_klass(orig_k);
555 }
556
557 bool KlassSubGraphInfo::is_non_early_klass(Klass* k) {
558 if (k->is_objArray_klass()) {
559 k = ObjArrayKlass::cast(k)->bottom_klass();
560 }
561 if (k->is_instance_klass()) {
562 if (!SystemDictionaryShared::is_early_klass(InstanceKlass::cast(k))) {
563 ResourceMark rm;
564 log_info(cds, heap)("non-early: %s", k->external_name());
565 return true;
566 } else {
567 return false;
568 }
569 } else {
570 return false;
571 }
572 }
573
574 // Initialize an archived subgraph_info_record from the given KlassSubGraphInfo.
575 void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) {
576 _k = info->klass();
577 _entry_field_records = NULL;
578 _subgraph_object_klasses = NULL;
579 _is_full_module_graph = info->is_full_module_graph();
580
581 if (_is_full_module_graph) {
582 // Consider all classes referenced by the full module graph as early -- we will be
583 // allocating objects of these classes during JVMTI early phase, so they cannot
584 // be processed by (non-early) JVMTI ClassFileLoadHook
585 _has_non_early_klasses = false;
586 } else {
587 _has_non_early_klasses = info->has_non_early_klasses();
588 }
589
590 if (_has_non_early_klasses) {
591 ResourceMark rm;
592 log_info(cds, heap)(
593 "Subgraph of klass %s has non-early klasses and cannot be used when JVMTI ClassFileLoadHook is enabled",
594 _k->external_name());
595 }
596
597 // populate the entry fields
598 GrowableArray<int>* entry_fields = info->subgraph_entry_fields();
599 if (entry_fields != NULL) {
600 int num_entry_fields = entry_fields->length();
601 assert(num_entry_fields % 2 == 0, "sanity");
602 _entry_field_records =
603 ArchiveBuilder::new_ro_array<int>(num_entry_fields);
604 for (int i = 0 ; i < num_entry_fields; i++) {
605 _entry_field_records->at_put(i, entry_fields->at(i));
606 }
607 }
608
609 // the Klasses of the objects in the sub-graphs
610 GrowableArray<Klass*>* subgraph_object_klasses = info->subgraph_object_klasses();
611 if (subgraph_object_klasses != NULL) {
612 int num_subgraphs_klasses = subgraph_object_klasses->length();
613 _subgraph_object_klasses =
614 ArchiveBuilder::new_ro_array<Klass*>(num_subgraphs_klasses);
615 for (int i = 0; i < num_subgraphs_klasses; i++) {
616 Klass* subgraph_k = subgraph_object_klasses->at(i);
617 if (log_is_enabled(Info, cds, heap)) {
618 ResourceMark rm;
619 log_info(cds, heap)(
620 "Archived object klass %s (%2d) => %s",
621 _k->external_name(), i, subgraph_k->external_name());
622 }
623 _subgraph_object_klasses->at_put(i, subgraph_k);
624 ArchivePtrMarker::mark_pointer(_subgraph_object_klasses->adr_at(i));
625 }
626 }
627
628 ArchivePtrMarker::mark_pointer(&_k);
629 ArchivePtrMarker::mark_pointer(&_entry_field_records);
630 ArchivePtrMarker::mark_pointer(&_subgraph_object_klasses);
631 }
632
633 struct CopyKlassSubGraphInfoToArchive : StackObj {
634 CompactHashtableWriter* _writer;
635 CopyKlassSubGraphInfoToArchive(CompactHashtableWriter* writer) : _writer(writer) {}
636
637 bool do_entry(Klass* klass, KlassSubGraphInfo& info) {
638 if (info.subgraph_object_klasses() != NULL || info.subgraph_entry_fields() != NULL) {
639 ArchivedKlassSubGraphInfoRecord* record =
640 (ArchivedKlassSubGraphInfoRecord*)ArchiveBuilder::ro_region_alloc(sizeof(ArchivedKlassSubGraphInfoRecord));
641 record->init(&info);
642
643 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary((address)klass);
644 u4 delta = ArchiveBuilder::current()->any_to_offset_u4(record);
645 _writer->add(hash, delta);
646 }
647 return true; // keep on iterating
648 }
649 };
650
651 // Build the records of archived subgraph infos, which include:
652 // - Entry points to all subgraphs from the containing class mirror. The entry
653 // points are static fields in the mirror. For each entry point, the field
654 // offset, value and is_closed_archive flag are recorded in the sub-graph
655 // info. The value is stored back to the corresponding field at runtime.
656 // - A list of klasses that need to be loaded/initialized before archived
657 // java object sub-graph can be accessed at runtime.
658 void HeapShared::write_subgraph_info_table() {
659 // Allocate the contents of the hashtable(s) inside the RO region of the CDS archive.
660 DumpTimeKlassSubGraphInfoTable* d_table = _dump_time_subgraph_info_table;
661 CompactHashtableStats stats;
662
663 _run_time_subgraph_info_table.reset();
664
665 CompactHashtableWriter writer(d_table->_count, &stats);
666 CopyKlassSubGraphInfoToArchive copy(&writer);
667 d_table->iterate(©);
668
669 writer.dump(&_run_time_subgraph_info_table, "subgraphs");
670 }
671
672 void HeapShared::serialize_subgraph_info_table_header(SerializeClosure* soc) {
673 _run_time_subgraph_info_table.serialize_header(soc);
674 }
675
676 static void verify_the_heap(Klass* k, const char* which) {
677 if (VerifyArchivedFields > 0) {
678 ResourceMark rm;
679 log_info(cds, heap)("Verify heap %s initializing static field(s) in %s",
680 which, k->external_name());
681
682 VM_Verify verify_op;
683 VMThread::execute(&verify_op);
684
685 if (VerifyArchivedFields > 1 && is_init_completed()) {
686 // At this time, the oop->klass() of some archived objects in the heap may not
687 // have been loaded into the system dictionary yet. Nevertheless, oop->klass() should
688 // have enough information (object size, oop maps, etc) so that a GC can be safely
689 // performed.
690 //
691 // -XX:VerifyArchivedFields=2 force a GC to happen in such an early stage
692 // to check for GC safety.
693 log_info(cds, heap)("Trigger GC %s initializing static field(s) in %s",
694 which, k->external_name());
695 FlagSetting fs1(VerifyBeforeGC, true);
696 FlagSetting fs2(VerifyDuringGC, true);
697 FlagSetting fs3(VerifyAfterGC, true);
698 Universe::heap()->collect(GCCause::_java_lang_system_gc);
699 }
700 }
701 }
702
703 // Before GC can execute, we must ensure that all oops reachable from HeapShared::roots()
704 // have a valid klass. I.e., oopDesc::klass() must have already been resolved.
705 //
706 // Note: if a ArchivedKlassSubGraphInfoRecord contains non-early classes, and JVMTI
707 // ClassFileLoadHook is enabled, it's possible for this class to be dynamically replaced. In
708 // this case, we will not load the ArchivedKlassSubGraphInfoRecord and will clear its roots.
709 void HeapShared::resolve_classes(JavaThread* THREAD) {
710 if (!is_fully_available()) {
711 return; // nothing to do
712 }
713 resolve_classes_for_subgraphs(closed_archive_subgraph_entry_fields,
714 num_closed_archive_subgraph_entry_fields,
715 THREAD);
716 resolve_classes_for_subgraphs(open_archive_subgraph_entry_fields,
717 num_open_archive_subgraph_entry_fields,
718 THREAD);
719 resolve_classes_for_subgraphs(fmg_open_archive_subgraph_entry_fields,
720 num_fmg_open_archive_subgraph_entry_fields,
721 THREAD);
722 }
723
724 void HeapShared::resolve_classes_for_subgraphs(ArchivableStaticFieldInfo fields[],
725 int num, JavaThread* THREAD) {
726 for (int i = 0; i < num; i++) {
727 ArchivableStaticFieldInfo* info = &fields[i];
728 TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name);
729 InstanceKlass* k = SystemDictionaryShared::find_builtin_class(klass_name);
730 assert(k != NULL && k->is_shared_boot_class(), "sanity");
731 resolve_classes_for_subgraph_of(k, THREAD);
732 }
733 }
734
735 void HeapShared::resolve_classes_for_subgraph_of(Klass* k, JavaThread* THREAD) {
736 ExceptionMark em(THREAD);
737 const ArchivedKlassSubGraphInfoRecord* record =
738 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/false, THREAD);
739 if (HAS_PENDING_EXCEPTION) {
740 CLEAR_PENDING_EXCEPTION;
741 }
742 if (record == NULL) {
743 clear_archived_roots_of(k);
744 }
745 }
746
747 void HeapShared::initialize_from_archived_subgraph(Klass* k, JavaThread* THREAD) {
748 if (!is_fully_available()) {
749 return; // nothing to do
750 }
751
752 ExceptionMark em(THREAD);
753 const ArchivedKlassSubGraphInfoRecord* record =
754 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/true, THREAD);
755
756 if (HAS_PENDING_EXCEPTION) {
757 CLEAR_PENDING_EXCEPTION;
758 // None of the field value will be set if there was an exception when initializing the classes.
759 // The java code will not see any of the archived objects in the
760 // subgraphs referenced from k in this case.
761 return;
762 }
763
764 if (record != NULL) {
765 init_archived_fields_for(k, record);
766 }
767 }
768
769 const ArchivedKlassSubGraphInfoRecord*
770 HeapShared::resolve_or_init_classes_for_subgraph_of(Klass* k, bool do_init, TRAPS) {
771 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
772
773 if (!k->is_shared()) {
774 return NULL;
775 }
776 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(k);
777 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0);
778
779 // Initialize from archived data. Currently this is done only
780 // during VM initialization time. No lock is needed.
781 if (record != NULL) {
782 if (record->is_full_module_graph() && !MetaspaceShared::use_full_module_graph()) {
783 if (log_is_enabled(Info, cds, heap)) {
784 ResourceMark rm(THREAD);
785 log_info(cds, heap)("subgraph %s cannot be used because full module graph is disabled",
786 k->external_name());
787 }
788 return NULL;
789 }
790
791 if (record->has_non_early_klasses() && JvmtiExport::should_post_class_file_load_hook()) {
792 if (log_is_enabled(Info, cds, heap)) {
793 ResourceMark rm(THREAD);
794 log_info(cds, heap)("subgraph %s cannot be used because JVMTI ClassFileLoadHook is enabled",
795 k->external_name());
796 }
797 return NULL;
798 }
799
800 resolve_or_init(k, do_init, CHECK_NULL);
801
802 // Load/link/initialize the klasses of the objects in the subgraph.
803 // NULL class loader is used.
804 Array<Klass*>* klasses = record->subgraph_object_klasses();
805 if (klasses != NULL) {
806 for (int i = 0; i < klasses->length(); i++) {
807 Klass* klass = klasses->at(i);
808 if (!klass->is_shared()) {
809 return NULL;
810 }
811 resolve_or_init(klass, do_init, CHECK_NULL);
812 }
813 }
814 }
815
816 return record;
817 }
818
819 void HeapShared::resolve_or_init(Klass* k, bool do_init, TRAPS) {
820 if (!do_init) {
821 if (k->class_loader_data() == NULL) {
822 Klass* resolved_k = SystemDictionary::resolve_or_null(k->name(), CHECK);
823 assert(resolved_k == k, "classes used by archived heap must not be replaced by JVMTI ClassFileLoadHook");
824 }
825 } else {
826 assert(k->class_loader_data() != NULL, "must have been resolved by HeapShared::resolve_classes");
827 if (k->is_instance_klass()) {
828 InstanceKlass* ik = InstanceKlass::cast(k);
829 ik->initialize(CHECK);
830 } else if (k->is_objArray_klass()) {
831 ObjArrayKlass* oak = ObjArrayKlass::cast(k);
832 oak->initialize(CHECK);
833 }
834 }
835 }
836
837 void HeapShared::init_archived_fields_for(Klass* k, const ArchivedKlassSubGraphInfoRecord* record) {
838 verify_the_heap(k, "before");
839
840 // Load the subgraph entry fields from the record and store them back to
841 // the corresponding fields within the mirror.
842 oop m = k->java_mirror();
843 Array<int>* entry_field_records = record->entry_field_records();
844 if (entry_field_records != NULL) {
845 int efr_len = entry_field_records->length();
846 assert(efr_len % 2 == 0, "sanity");
847 for (int i = 0; i < efr_len; i += 2) {
848 int field_offset = entry_field_records->at(i);
849 int root_index = entry_field_records->at(i+1);
850 oop v = get_root(root_index, /*clear=*/true);
851 m->obj_field_put(field_offset, v);
852 log_debug(cds, heap)(" " PTR_FORMAT " init field @ %2d = " PTR_FORMAT, p2i(k), field_offset, p2i(v));
853 }
854
855 // Done. Java code can see the archived sub-graphs referenced from k's
856 // mirror after this point.
857 if (log_is_enabled(Info, cds, heap)) {
858 ResourceMark rm;
859 log_info(cds, heap)("initialize_from_archived_subgraph %s " PTR_FORMAT "%s",
860 k->external_name(), p2i(k), JvmtiExport::is_early_phase() ? " (early)" : "");
861 }
862 }
863
864 verify_the_heap(k, "after ");
865 }
866
867 void HeapShared::clear_archived_roots_of(Klass* k) {
868 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(k);
869 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0);
870 if (record != NULL) {
871 Array<int>* entry_field_records = record->entry_field_records();
872 if (entry_field_records != NULL) {
873 int efr_len = entry_field_records->length();
874 assert(efr_len % 2 == 0, "sanity");
875 for (int i = 0; i < efr_len; i += 2) {
876 int root_index = entry_field_records->at(i+1);
877 clear_root(root_index);
878 }
879 }
880 }
881 }
882
883 class WalkOopAndArchiveClosure: public BasicOopIterateClosure {
884 int _level;
885 bool _is_closed_archive;
886 bool _record_klasses_only;
887 KlassSubGraphInfo* _subgraph_info;
888 oop _orig_referencing_obj;
889 oop _archived_referencing_obj;
890 public:
891 WalkOopAndArchiveClosure(int level,
892 bool is_closed_archive,
893 bool record_klasses_only,
894 KlassSubGraphInfo* subgraph_info,
895 oop orig, oop archived) :
896 _level(level), _is_closed_archive(is_closed_archive),
897 _record_klasses_only(record_klasses_only),
898 _subgraph_info(subgraph_info),
899 _orig_referencing_obj(orig), _archived_referencing_obj(archived) {}
900 void do_oop(narrowOop *p) { WalkOopAndArchiveClosure::do_oop_work(p); }
901 void do_oop( oop *p) { WalkOopAndArchiveClosure::do_oop_work(p); }
902
903 protected:
904 template <class T> void do_oop_work(T *p) {
905 oop obj = RawAccess<>::oop_load(p);
906 if (!CompressedOops::is_null(obj)) {
907 assert(!HeapShared::is_archived_object_during_dumptime(obj),
908 "original objects must not point to archived objects");
909
910 size_t field_delta = pointer_delta(p, _orig_referencing_obj, sizeof(char));
911 T* new_p = (T*)(cast_from_oop<address>(_archived_referencing_obj) + field_delta);
912
913 if (!_record_klasses_only && log_is_enabled(Debug, cds, heap)) {
914 ResourceMark rm;
915 log_debug(cds, heap)("(%d) %s[" SIZE_FORMAT "] ==> " PTR_FORMAT " size %d %s", _level,
916 _orig_referencing_obj->klass()->external_name(), field_delta,
917 p2i(obj), obj->size() * HeapWordSize, obj->klass()->external_name());
918 LogTarget(Trace, cds, heap) log;
919 LogStream out(log);
920 obj->print_on(&out);
921 }
922
923 oop archived = HeapShared::archive_reachable_objects_from(
924 _level + 1, _subgraph_info, obj, _is_closed_archive);
925 assert(archived != NULL, "VM should have exited with unarchivable objects for _level > 1");
926 assert(HeapShared::is_archived_object_during_dumptime(archived), "must be");
927
928 if (!_record_klasses_only) {
929 // Update the reference in the archived copy of the referencing object.
930 log_debug(cds, heap)("(%d) updating oop @[" PTR_FORMAT "] " PTR_FORMAT " ==> " PTR_FORMAT,
931 _level, p2i(new_p), p2i(obj), p2i(archived));
932 RawAccess<IS_NOT_NULL>::oop_store(new_p, archived);
933 }
934 }
935 }
936 };
937
938 void HeapShared::check_closed_region_object(InstanceKlass* k) {
939 // Check fields in the object
940 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
941 if (!fs.access_flags().is_static()) {
942 BasicType ft = fs.field_descriptor().field_type();
943 if (!fs.access_flags().is_final() && is_reference_type(ft)) {
944 ResourceMark rm;
945 log_warning(cds, heap)(
946 "Please check reference field in %s instance in closed archive heap region: %s %s",
947 k->external_name(), (fs.name())->as_C_string(),
948 (fs.signature())->as_C_string());
949 }
950 }
951 }
952 }
953
954 void HeapShared::check_module_oop(oop orig_module_obj) {
955 assert(DumpSharedSpaces, "must be");
956 assert(java_lang_Module::is_instance(orig_module_obj), "must be");
957 ModuleEntry* orig_module_ent = java_lang_Module::module_entry_raw(orig_module_obj);
958 if (orig_module_ent == NULL) {
959 // These special Module objects are created in Java code. They are not
960 // defined via Modules::define_module(), so they don't have a ModuleEntry:
961 // java.lang.Module::ALL_UNNAMED_MODULE
962 // java.lang.Module::EVERYONE_MODULE
963 // jdk.internal.loader.ClassLoaders$BootClassLoader::unnamedModule
964 assert(java_lang_Module::name(orig_module_obj) == NULL, "must be unnamed");
965 log_info(cds, heap)("Module oop with No ModuleEntry* @[" PTR_FORMAT "]", p2i(orig_module_obj));
966 } else {
967 ClassLoaderData* loader_data = orig_module_ent->loader_data();
968 assert(loader_data->is_builtin_class_loader_data(), "must be");
969 }
970 }
971
972
973 // (1) If orig_obj has not been archived yet, archive it.
974 // (2) If orig_obj has not been seen yet (since start_recording_subgraph() was called),
975 // trace all objects that are reachable from it, and make sure these objects are archived.
976 // (3) Record the klasses of all orig_obj and all reachable objects.
977 oop HeapShared::archive_reachable_objects_from(int level,
978 KlassSubGraphInfo* subgraph_info,
979 oop orig_obj,
980 bool is_closed_archive) {
981 assert(orig_obj != NULL, "must be");
982 assert(!is_archived_object_during_dumptime(orig_obj), "sanity");
983
984 if (!JavaClasses::is_supported_for_archiving(orig_obj)) {
985 // This object has injected fields that cannot be supported easily, so we disallow them for now.
986 // If you get an error here, you probably made a change in the JDK library that has added
987 // these objects that are referenced (directly or indirectly) by static fields.
988 ResourceMark rm;
989 log_error(cds, heap)("Cannot archive object of class %s", orig_obj->klass()->external_name());
990 vm_direct_exit(1);
991 }
992
993 // java.lang.Class instances cannot be included in an archived object sub-graph. We only support
994 // them as Klass::_archived_mirror because they need to be specially restored at run time.
995 //
996 // If you get an error here, you probably made a change in the JDK library that has added a Class
997 // object that is referenced (directly or indirectly) by static fields.
998 if (java_lang_Class::is_instance(orig_obj)) {
999 log_error(cds, heap)("(%d) Unknown java.lang.Class object is in the archived sub-graph", level);
1000 vm_direct_exit(1);
1001 }
1002
1003 oop archived_obj = find_archived_heap_object(orig_obj);
1004 if (java_lang_String::is_instance(orig_obj) && archived_obj != NULL) {
1005 // To save time, don't walk strings that are already archived. They just contain
1006 // pointers to a type array, whose klass doesn't need to be recorded.
1007 return archived_obj;
1008 }
1009
1010 if (has_been_seen_during_subgraph_recording(orig_obj)) {
1011 // orig_obj has already been archived and traced. Nothing more to do.
1012 return archived_obj;
1013 } else {
1014 set_has_been_seen_during_subgraph_recording(orig_obj);
1015 }
1016
1017 bool record_klasses_only = (archived_obj != NULL);
1018 if (archived_obj == NULL) {
1019 ++_num_new_archived_objs;
1020 archived_obj = archive_object(orig_obj);
1021 if (archived_obj == NULL) {
1022 // Skip archiving the sub-graph referenced from the current entry field.
1023 ResourceMark rm;
1024 log_error(cds, heap)(
1025 "Cannot archive the sub-graph referenced from %s object ("
1026 PTR_FORMAT ") size %d, skipped.",
1027 orig_obj->klass()->external_name(), p2i(orig_obj), orig_obj->size() * HeapWordSize);
1028 if (level == 1) {
1029 // Don't archive a subgraph root that's too big. For archives static fields, that's OK
1030 // as the Java code will take care of initializing this field dynamically.
1031 return NULL;
1032 } else {
1033 // We don't know how to handle an object that has been archived, but some of its reachable
1034 // objects cannot be archived. Bail out for now. We might need to fix this in the future if
1035 // we have a real use case.
1036 vm_direct_exit(1);
1037 }
1038 }
1039
1040 if (java_lang_Module::is_instance(orig_obj)) {
1041 check_module_oop(orig_obj);
1042 java_lang_Module::set_module_entry(archived_obj, NULL);
1043 java_lang_Module::set_loader(archived_obj, NULL);
1044 } else if (java_lang_ClassLoader::is_instance(orig_obj)) {
1045 // class_data will be restored explicitly at run time.
1046 guarantee(orig_obj == SystemDictionary::java_platform_loader() ||
1047 orig_obj == SystemDictionary::java_system_loader() ||
1048 java_lang_ClassLoader::loader_data(orig_obj) == NULL, "must be");
1049 java_lang_ClassLoader::release_set_loader_data(archived_obj, NULL);
1050 }
1051 }
1052
1053 assert(archived_obj != NULL, "must be");
1054 Klass *orig_k = orig_obj->klass();
1055 subgraph_info->add_subgraph_object_klass(orig_k);
1056
1057 WalkOopAndArchiveClosure walker(level, is_closed_archive, record_klasses_only,
1058 subgraph_info, orig_obj, archived_obj);
1059 orig_obj->oop_iterate(&walker);
1060 if (is_closed_archive && orig_k->is_instance_klass()) {
1061 check_closed_region_object(InstanceKlass::cast(orig_k));
1062 }
1063 return archived_obj;
1064 }
1065
1066 //
1067 // Start from the given static field in a java mirror and archive the
1068 // complete sub-graph of java heap objects that are reached directly
1069 // or indirectly from the starting object by following references.
1070 // Sub-graph archiving restrictions (current):
1071 //
1072 // - All classes of objects in the archived sub-graph (including the
1073 // entry class) must be boot class only.
1074 // - No java.lang.Class instance (java mirror) can be included inside
1075 // an archived sub-graph. Mirror can only be the sub-graph entry object.
1076 //
1077 // The Java heap object sub-graph archiving process (see
1078 // WalkOopAndArchiveClosure):
1079 //
1080 // 1) Java object sub-graph archiving starts from a given static field
1081 // within a Class instance (java mirror). If the static field is a
1082 // refererence field and points to a non-null java object, proceed to
1083 // the next step.
1084 //
1085 // 2) Archives the referenced java object. If an archived copy of the
1086 // current object already exists, updates the pointer in the archived
1087 // copy of the referencing object to point to the current archived object.
1088 // Otherwise, proceed to the next step.
1089 //
1090 // 3) Follows all references within the current java object and recursively
1091 // archive the sub-graph of objects starting from each reference.
1092 //
1093 // 4) Updates the pointer in the archived copy of referencing object to
1094 // point to the current archived object.
1095 //
1096 // 5) The Klass of the current java object is added to the list of Klasses
1097 // for loading and initialzing before any object in the archived graph can
1098 // be accessed at runtime.
1099 //
1100 void HeapShared::archive_reachable_objects_from_static_field(InstanceKlass *k,
1101 const char* klass_name,
1102 int field_offset,
1103 const char* field_name,
1104 bool is_closed_archive) {
1105 assert(DumpSharedSpaces, "dump time only");
1106 assert(k->is_shared_boot_class(), "must be boot class");
1107
1108 oop m = k->java_mirror();
1109
1110 KlassSubGraphInfo* subgraph_info = get_subgraph_info(k);
1111 oop f = m->obj_field(field_offset);
1112
1113 log_debug(cds, heap)("Start archiving from: %s::%s (" PTR_FORMAT ")", klass_name, field_name, p2i(f));
1114
1115 if (!CompressedOops::is_null(f)) {
1116 if (log_is_enabled(Trace, cds, heap)) {
1117 LogTarget(Trace, cds, heap) log;
1118 LogStream out(log);
1119 f->print_on(&out);
1120 }
1121
1122 oop af = archive_reachable_objects_from(1, subgraph_info, f, is_closed_archive);
1123
1124 if (af == NULL) {
1125 log_error(cds, heap)("Archiving failed %s::%s (some reachable objects cannot be archived)",
1126 klass_name, field_name);
1127 } else {
1128 // Note: the field value is not preserved in the archived mirror.
1129 // Record the field as a new subGraph entry point. The recorded
1130 // information is restored from the archive at runtime.
1131 subgraph_info->add_subgraph_entry_field(field_offset, af, is_closed_archive);
1132 log_info(cds, heap)("Archived field %s::%s => " PTR_FORMAT, klass_name, field_name, p2i(af));
1133 }
1134 } else {
1135 // The field contains null, we still need to record the entry point,
1136 // so it can be restored at runtime.
1137 subgraph_info->add_subgraph_entry_field(field_offset, NULL, false);
1138 }
1139 }
1140
1141 #ifndef PRODUCT
1142 class VerifySharedOopClosure: public BasicOopIterateClosure {
1143 private:
1144 bool _is_archived;
1145
1146 public:
1147 VerifySharedOopClosure(bool is_archived) : _is_archived(is_archived) {}
1148
1149 void do_oop(narrowOop *p) { VerifySharedOopClosure::do_oop_work(p); }
1150 void do_oop( oop *p) { VerifySharedOopClosure::do_oop_work(p); }
1151
1152 protected:
1153 template <class T> void do_oop_work(T *p) {
1154 oop obj = RawAccess<>::oop_load(p);
1155 if (!CompressedOops::is_null(obj)) {
1156 HeapShared::verify_reachable_objects_from(obj, _is_archived);
1157 }
1158 }
1159 };
1160
1161 void HeapShared::verify_subgraph_from_static_field(InstanceKlass* k, int field_offset) {
1162 assert(DumpSharedSpaces, "dump time only");
1163 assert(k->is_shared_boot_class(), "must be boot class");
1164
1165 oop m = k->java_mirror();
1166 oop f = m->obj_field(field_offset);
1167 if (!CompressedOops::is_null(f)) {
1168 verify_subgraph_from(f);
1169 }
1170 }
1171
1172 void HeapShared::verify_subgraph_from(oop orig_obj) {
1173 oop archived_obj = find_archived_heap_object(orig_obj);
1174 if (archived_obj == NULL) {
1175 // It's OK for the root of a subgraph to be not archived. See comments in
1176 // archive_reachable_objects_from().
1177 return;
1178 }
1179
1180 // Verify that all objects reachable from orig_obj are archived.
1181 init_seen_objects_table();
1182 verify_reachable_objects_from(orig_obj, false);
1183 delete_seen_objects_table();
1184
1185 // Note: we could also verify that all objects reachable from the archived
1186 // copy of orig_obj can only point to archived objects, with:
1187 // init_seen_objects_table();
1188 // verify_reachable_objects_from(archived_obj, true);
1189 // init_seen_objects_table();
1190 // but that's already done in G1HeapVerifier::verify_archive_regions so we
1191 // won't do it here.
1192 }
1193
1194 void HeapShared::verify_reachable_objects_from(oop obj, bool is_archived) {
1195 _num_total_verifications ++;
1196 if (!has_been_seen_during_subgraph_recording(obj)) {
1197 set_has_been_seen_during_subgraph_recording(obj);
1198
1199 if (is_archived) {
1200 assert(is_archived_object_during_dumptime(obj), "must be");
1201 assert(find_archived_heap_object(obj) == NULL, "must be");
1202 } else {
1203 assert(!is_archived_object_during_dumptime(obj), "must be");
1204 assert(find_archived_heap_object(obj) != NULL, "must be");
1205 }
1206
1207 VerifySharedOopClosure walker(is_archived);
1208 obj->oop_iterate(&walker);
1209 }
1210 }
1211 #endif
1212
1213 HeapShared::SeenObjectsTable* HeapShared::_seen_objects_table = NULL;
1214 int HeapShared::_num_new_walked_objs;
1215 int HeapShared::_num_new_archived_objs;
1216 int HeapShared::_num_old_recorded_klasses;
1217
1218 int HeapShared::_num_total_subgraph_recordings = 0;
1219 int HeapShared::_num_total_walked_objs = 0;
1220 int HeapShared::_num_total_archived_objs = 0;
1221 int HeapShared::_num_total_recorded_klasses = 0;
1222 int HeapShared::_num_total_verifications = 0;
1223
1224 bool HeapShared::has_been_seen_during_subgraph_recording(oop obj) {
1225 return _seen_objects_table->get(obj) != NULL;
1226 }
1227
1228 void HeapShared::set_has_been_seen_during_subgraph_recording(oop obj) {
1229 assert(!has_been_seen_during_subgraph_recording(obj), "sanity");
1230 _seen_objects_table->put(obj, true);
1231 ++ _num_new_walked_objs;
1232 }
1233
1234 void HeapShared::start_recording_subgraph(InstanceKlass *k, const char* class_name, bool is_full_module_graph) {
1235 log_info(cds, heap)("Start recording subgraph(s) for archived fields in %s", class_name);
1236 init_subgraph_info(k, is_full_module_graph);
1237 init_seen_objects_table();
1238 _num_new_walked_objs = 0;
1239 _num_new_archived_objs = 0;
1240 _num_old_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses();
1241 }
1242
1243 void HeapShared::done_recording_subgraph(InstanceKlass *k, const char* class_name) {
1244 int num_new_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses() -
1245 _num_old_recorded_klasses;
1246 log_info(cds, heap)("Done recording subgraph(s) for archived fields in %s: "
1247 "walked %d objs, archived %d new objs, recorded %d classes",
1248 class_name, _num_new_walked_objs, _num_new_archived_objs,
1249 num_new_recorded_klasses);
1250
1251 delete_seen_objects_table();
1252
1253 _num_total_subgraph_recordings ++;
1254 _num_total_walked_objs += _num_new_walked_objs;
1255 _num_total_archived_objs += _num_new_archived_objs;
1256 _num_total_recorded_klasses += num_new_recorded_klasses;
1257 }
1258
1259 class ArchivableStaticFieldFinder: public FieldClosure {
1260 InstanceKlass* _ik;
1261 Symbol* _field_name;
1262 bool _found;
1263 int _offset;
1264 public:
1265 ArchivableStaticFieldFinder(InstanceKlass* ik, Symbol* field_name) :
1266 _ik(ik), _field_name(field_name), _found(false), _offset(-1) {}
1267
1268 virtual void do_field(fieldDescriptor* fd) {
1269 if (fd->name() == _field_name) {
1270 assert(!_found, "fields cannot be overloaded");
1271 assert(is_reference_type(fd->field_type()), "can archive only fields that are references");
1272 _found = true;
1273 _offset = fd->offset();
1274 }
1275 }
1276 bool found() { return _found; }
1277 int offset() { return _offset; }
1278 };
1279
1280 void HeapShared::init_subgraph_entry_fields(ArchivableStaticFieldInfo fields[],
1281 int num, TRAPS) {
1282 for (int i = 0; i < num; i++) {
1283 ArchivableStaticFieldInfo* info = &fields[i];
1284 TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name);
1285 TempNewSymbol field_name = SymbolTable::new_symbol(info->field_name);
1286
1287 Klass* k = SystemDictionary::resolve_or_fail(klass_name, true, CHECK);
1288 InstanceKlass* ik = InstanceKlass::cast(k);
1289 assert(InstanceKlass::cast(ik)->is_shared_boot_class(),
1290 "Only support boot classes");
1291 ik->initialize(CHECK);
1292
1293 ArchivableStaticFieldFinder finder(ik, field_name);
1294 ik->do_local_static_fields(&finder);
1295 assert(finder.found(), "field must exist");
1296
1297 info->klass = ik;
1298 info->offset = finder.offset();
1299 }
1300 }
1301
1302 void HeapShared::init_subgraph_entry_fields(TRAPS) {
1303 assert(HeapShared::can_write(), "must be");
1304 _dump_time_subgraph_info_table = new (ResourceObj::C_HEAP, mtClass)DumpTimeKlassSubGraphInfoTable();
1305 init_subgraph_entry_fields(closed_archive_subgraph_entry_fields,
1306 num_closed_archive_subgraph_entry_fields,
1307 CHECK);
1308 init_subgraph_entry_fields(open_archive_subgraph_entry_fields,
1309 num_open_archive_subgraph_entry_fields,
1310 CHECK);
1311 if (MetaspaceShared::use_full_module_graph()) {
1312 init_subgraph_entry_fields(fmg_open_archive_subgraph_entry_fields,
1313 num_fmg_open_archive_subgraph_entry_fields,
1314 CHECK);
1315 }
1316 }
1317
1318 void HeapShared::init_for_dumping(TRAPS) {
1319 if (HeapShared::can_write()) {
1320 _dumped_interned_strings = new (ResourceObj::C_HEAP, mtClass)DumpedInternedStrings();
1321 init_subgraph_entry_fields(CHECK);
1322 }
1323 }
1324
1325 void HeapShared::archive_object_subgraphs(ArchivableStaticFieldInfo fields[],
1326 int num, bool is_closed_archive,
1327 bool is_full_module_graph) {
1328 _num_total_subgraph_recordings = 0;
1329 _num_total_walked_objs = 0;
1330 _num_total_archived_objs = 0;
1331 _num_total_recorded_klasses = 0;
1332 _num_total_verifications = 0;
1333
1334 // For each class X that has one or more archived fields:
1335 // [1] Dump the subgraph of each archived field
1336 // [2] Create a list of all the class of the objects that can be reached
1337 // by any of these static fields.
1338 // At runtime, these classes are initialized before X's archived fields
1339 // are restored by HeapShared::initialize_from_archived_subgraph().
1340 int i;
1341 for (i = 0; i < num; ) {
1342 ArchivableStaticFieldInfo* info = &fields[i];
1343 const char* klass_name = info->klass_name;
1344 start_recording_subgraph(info->klass, klass_name, is_full_module_graph);
1345
1346 // If you have specified consecutive fields of the same klass in
1347 // fields[], these will be archived in the same
1348 // {start_recording_subgraph ... done_recording_subgraph} pass to
1349 // save time.
1350 for (; i < num; i++) {
1351 ArchivableStaticFieldInfo* f = &fields[i];
1352 if (f->klass_name != klass_name) {
1353 break;
1354 }
1355
1356 archive_reachable_objects_from_static_field(f->klass, f->klass_name,
1357 f->offset, f->field_name,
1358 is_closed_archive);
1359 }
1360 done_recording_subgraph(info->klass, klass_name);
1361 }
1362
1363 log_info(cds, heap)("Archived subgraph records in %s archive heap region = %d",
1364 is_closed_archive ? "closed" : "open",
1365 _num_total_subgraph_recordings);
1366 log_info(cds, heap)(" Walked %d objects", _num_total_walked_objs);
1367 log_info(cds, heap)(" Archived %d objects", _num_total_archived_objs);
1368 log_info(cds, heap)(" Recorded %d klasses", _num_total_recorded_klasses);
1369
1370 #ifndef PRODUCT
1371 for (int i = 0; i < num; i++) {
1372 ArchivableStaticFieldInfo* f = &fields[i];
1373 verify_subgraph_from_static_field(f->klass, f->offset);
1374 }
1375 log_info(cds, heap)(" Verified %d references", _num_total_verifications);
1376 #endif
1377 }
1378
1379 // Not all the strings in the global StringTable are dumped into the archive, because
1380 // some of those strings may be only referenced by classes that are excluded from
1381 // the archive. We need to explicitly mark the strings that are:
1382 // [1] used by classes that WILL be archived;
1383 // [2] included in the SharedArchiveConfigFile.
1384 void HeapShared::add_to_dumped_interned_strings(oop string) {
1385 assert_at_safepoint(); // DumpedInternedStrings uses raw oops
1386 bool created;
1387 _dumped_interned_strings->put_if_absent(string, true, &created);
1388 }
1389
1390 // At dump-time, find the location of all the non-null oop pointers in an archived heap
1391 // region. This way we can quickly relocate all the pointers without using
1392 // BasicOopIterateClosure at runtime.
1393 class FindEmbeddedNonNullPointers: public BasicOopIterateClosure {
1394 narrowOop* _start;
1395 BitMap *_oopmap;
1396 int _num_total_oops;
1397 int _num_null_oops;
1398 public:
1399 FindEmbeddedNonNullPointers(narrowOop* start, BitMap* oopmap)
1400 : _start(start), _oopmap(oopmap), _num_total_oops(0), _num_null_oops(0) {}
1401
1402 virtual void do_oop(narrowOop* p) {
1403 _num_total_oops ++;
1404 narrowOop v = *p;
1405 if (!CompressedOops::is_null(v)) {
1406 size_t idx = p - _start;
1407 _oopmap->set_bit(idx);
1408 } else {
1409 _num_null_oops ++;
1410 }
1411 }
1412 virtual void do_oop(oop *p) {
1413 ShouldNotReachHere();
1414 }
1415 int num_total_oops() const { return _num_total_oops; }
1416 int num_null_oops() const { return _num_null_oops; }
1417 };
1418
1419 ResourceBitMap HeapShared::calculate_oopmap(MemRegion region) {
1420 assert(UseCompressedOops, "must be");
1421 size_t num_bits = region.byte_size() / sizeof(narrowOop);
1422 ResourceBitMap oopmap(num_bits);
1423
1424 HeapWord* p = region.start();
1425 HeapWord* end = region.end();
1426 FindEmbeddedNonNullPointers finder((narrowOop*)p, &oopmap);
1427 ArchiveBuilder* builder = DumpSharedSpaces ? ArchiveBuilder::current() : NULL;
1428
1429 int num_objs = 0;
1430 while (p < end) {
1431 oop o = cast_to_oop(p);
1432 o->oop_iterate(&finder);
1433 p += o->size();
1434 if (DumpSharedSpaces) {
1435 builder->relocate_klass_ptr(o);
1436 }
1437 ++ num_objs;
1438 }
1439
1440 log_info(cds, heap)("calculate_oopmap: objects = %6d, embedded oops = %7d, nulls = %7d",
1441 num_objs, finder.num_total_oops(), finder.num_null_oops());
1442 return oopmap;
1443 }
1444
1445 // Patch all the embedded oop pointers inside an archived heap region,
1446 // to be consistent with the runtime oop encoding.
1447 class PatchEmbeddedPointers: public BitMapClosure {
1448 narrowOop* _start;
1449
1450 public:
1451 PatchEmbeddedPointers(narrowOop* start) : _start(start) {}
1452
1453 bool do_bit(size_t offset) {
1454 narrowOop* p = _start + offset;
1455 narrowOop v = *p;
1456 assert(!CompressedOops::is_null(v), "null oops should have been filtered out at dump time");
1457 oop o = HeapShared::decode_from_archive(v);
1458 RawAccess<IS_NOT_NULL>::oop_store(p, o);
1459 return true;
1460 }
1461 };
1462
1463 // Patch all the non-null pointers that are embedded in the archived heap objects
1464 // in this region
1465 void HeapShared::patch_embedded_pointers(MemRegion region, address oopmap,
1466 size_t oopmap_size_in_bits) {
1467 BitMapView bm((BitMap::bm_word_t*)oopmap, oopmap_size_in_bits);
1468
1469 #ifndef PRODUCT
1470 ResourceMark rm;
1471 ResourceBitMap checkBm = calculate_oopmap(region);
1472 assert(bm.is_same(checkBm), "sanity");
1473 #endif
1474
1475 PatchEmbeddedPointers patcher((narrowOop*)region.start());
1476 bm.iterate(&patcher);
1477 }
1478
1479 // The CDS archive remembers each heap object by its address at dump time, but
1480 // the heap object may be loaded at a different address at run time. This structure is used
1481 // to translate the dump time addresses for all objects in FileMapInfo::space_at(region_index)
1482 // to their runtime addresses.
1483 struct LoadedArchiveHeapRegion {
1484 int _region_index; // index for FileMapInfo::space_at(index)
1485 size_t _region_size; // number of bytes in this region
1486 uintptr_t _dumptime_base; // The dump-time (decoded) address of the first object in this region
1487 intx _runtime_offset; // If an object's dump time address P is within in this region, its
1488 // runtime address is P + _runtime_offset
1489
1490 static int comparator(const void* a, const void* b) {
1491 LoadedArchiveHeapRegion* reg_a = (LoadedArchiveHeapRegion*)a;
1492 LoadedArchiveHeapRegion* reg_b = (LoadedArchiveHeapRegion*)b;
1493 if (reg_a->_dumptime_base < reg_b->_dumptime_base) {
1494 return -1;
1495 } else if (reg_a->_dumptime_base == reg_b->_dumptime_base) {
1496 return 0;
1497 } else {
1498 return 1;
1499 }
1500 }
1501
1502 uintptr_t top() {
1503 return _dumptime_base + _region_size;
1504 }
1505 };
1506
1507 void HeapShared::init_loaded_heap_relocation(LoadedArchiveHeapRegion* loaded_regions,
1508 int num_loaded_regions) {
1509 _dumptime_base_0 = loaded_regions[0]._dumptime_base;
1510 _dumptime_base_1 = loaded_regions[1]._dumptime_base;
1511 _dumptime_base_2 = loaded_regions[2]._dumptime_base;
1512 _dumptime_base_3 = loaded_regions[3]._dumptime_base;
1513 _dumptime_top = loaded_regions[num_loaded_regions-1].top();
1514
1515 _runtime_offset_0 = loaded_regions[0]._runtime_offset;
1516 _runtime_offset_1 = loaded_regions[1]._runtime_offset;
1517 _runtime_offset_2 = loaded_regions[2]._runtime_offset;
1518 _runtime_offset_3 = loaded_regions[3]._runtime_offset;
1519
1520 assert(2 <= num_loaded_regions && num_loaded_regions <= 4, "must be");
1521 if (num_loaded_regions < 4) {
1522 _dumptime_base_3 = UINTPTR_MAX;
1523 }
1524 if (num_loaded_regions < 3) {
1525 _dumptime_base_2 = UINTPTR_MAX;
1526 }
1527 }
1528
1529 bool HeapShared::can_load() {
1530 return Universe::heap()->can_load_archived_objects();
1531 }
1532
1533 template <int NUM_LOADED_REGIONS>
1534 class PatchLoadedRegionPointers: public BitMapClosure {
1535 narrowOop* _start;
1536 intx _offset_0;
1537 intx _offset_1;
1538 intx _offset_2;
1539 intx _offset_3;
1540 uintptr_t _base_0;
1541 uintptr_t _base_1;
1542 uintptr_t _base_2;
1543 uintptr_t _base_3;
1544 uintptr_t _top;
1545
1546 static_assert(MetaspaceShared::max_num_heap_regions == 4, "can't handle more than 4 regions");
1547 static_assert(NUM_LOADED_REGIONS >= 2, "we have at least 2 loaded regions");
1548 static_assert(NUM_LOADED_REGIONS <= 4, "we have at most 4 loaded regions");
1549
1550 public:
1551 PatchLoadedRegionPointers(narrowOop* start, LoadedArchiveHeapRegion* loaded_regions)
1552 : _start(start),
1553 _offset_0(loaded_regions[0]._runtime_offset),
1554 _offset_1(loaded_regions[1]._runtime_offset),
1555 _offset_2(loaded_regions[2]._runtime_offset),
1556 _offset_3(loaded_regions[3]._runtime_offset),
1557 _base_0(loaded_regions[0]._dumptime_base),
1558 _base_1(loaded_regions[1]._dumptime_base),
1559 _base_2(loaded_regions[2]._dumptime_base),
1560 _base_3(loaded_regions[3]._dumptime_base) {
1561 _top = loaded_regions[NUM_LOADED_REGIONS-1].top();
1562 }
1563
1564 bool do_bit(size_t offset) {
1565 narrowOop* p = _start + offset;
1566 narrowOop v = *p;
1567 assert(!CompressedOops::is_null(v), "null oops should have been filtered out at dump time");
1568 uintptr_t o = cast_from_oop<uintptr_t>(HeapShared::decode_from_archive(v));
1569 assert(_base_0 <= o && o < _top, "must be");
1570
1571
1572 // We usually have only 2 regions for the default archive. Use template to avoid unnecessary comparisons.
1573 if (NUM_LOADED_REGIONS > 3 && o >= _base_3) {
1574 o += _offset_3;
1575 } else if (NUM_LOADED_REGIONS > 2 && o >= _base_2) {
1576 o += _offset_2;
1577 } else if (o >= _base_1) {
1578 o += _offset_1;
1579 } else {
1580 o += _offset_0;
1581 }
1582 HeapShared::assert_in_loaded_heap(o);
1583 RawAccess<IS_NOT_NULL>::oop_store(p, cast_to_oop(o));
1584 return true;
1585 }
1586 };
1587
1588 int HeapShared::init_loaded_regions(FileMapInfo* mapinfo, LoadedArchiveHeapRegion* loaded_regions,
1589 MemRegion& archive_space) {
1590 size_t total_bytes = 0;
1591 int num_loaded_regions = 0;
1592 for (int i = MetaspaceShared::first_archive_heap_region;
1593 i <= MetaspaceShared::last_archive_heap_region; i++) {
1594 FileMapRegion* r = mapinfo->space_at(i);
1595 r->assert_is_heap_region();
1596 if (r->used() > 0) {
1597 assert(is_aligned(r->used(), HeapWordSize), "must be");
1598 total_bytes += r->used();
1599 LoadedArchiveHeapRegion* ri = &loaded_regions[num_loaded_regions++];
1600 ri->_region_index = i;
1601 ri->_region_size = r->used();
1602 ri->_dumptime_base = (uintptr_t)mapinfo->start_address_as_decoded_from_archive(r);
1603 }
1604 }
1605
1606 assert(is_aligned(total_bytes, HeapWordSize), "must be");
1607 size_t word_size = total_bytes / HeapWordSize;
1608 HeapWord* buffer = Universe::heap()->allocate_loaded_archive_space(word_size);
1609 if (buffer == nullptr) {
1610 return 0;
1611 }
1612
1613 archive_space = MemRegion(buffer, word_size);
1614 _loaded_heap_bottom = (uintptr_t)archive_space.start();
1615 _loaded_heap_top = _loaded_heap_bottom + total_bytes;
1616
1617 return num_loaded_regions;
1618 }
1619
1620 void HeapShared::sort_loaded_regions(LoadedArchiveHeapRegion* loaded_regions, int num_loaded_regions,
1621 uintptr_t buffer) {
1622 // Find the relocation offset of the pointers in each region
1623 qsort(loaded_regions, num_loaded_regions, sizeof(LoadedArchiveHeapRegion),
1624 LoadedArchiveHeapRegion::comparator);
1625
1626 uintptr_t p = buffer;
1627 for (int i = 0; i < num_loaded_regions; i++) {
1628 // This region will be loaded at p, so all objects inside this
1629 // region will be shifted by ri->offset
1630 LoadedArchiveHeapRegion* ri = &loaded_regions[i];
1631 ri->_runtime_offset = p - ri->_dumptime_base;
1632 p += ri->_region_size;
1633 }
1634 assert(p == _loaded_heap_top, "must be");
1635 }
1636
1637 bool HeapShared::load_regions(FileMapInfo* mapinfo, LoadedArchiveHeapRegion* loaded_regions,
1638 int num_loaded_regions, uintptr_t buffer) {
1639 uintptr_t bitmap_base = (uintptr_t)mapinfo->map_bitmap_region();
1640 uintptr_t load_address = buffer;
1641 for (int i = 0; i < num_loaded_regions; i++) {
1642 LoadedArchiveHeapRegion* ri = &loaded_regions[i];
1643 FileMapRegion* r = mapinfo->space_at(ri->_region_index);
1644
1645 if (!mapinfo->read_region(ri->_region_index, (char*)load_address, r->used(), /* do_commit = */ false)) {
1646 // There's no easy way to free the buffer, so we will fill it with zero later
1647 // in fill_failed_loaded_region(), and it will eventually be GC'ed.
1648 log_warning(cds)("Loading of heap region %d has failed. Archived objects are disabled", i);
1649 _loading_failed = true;
1650 return false;
1651 }
1652 log_info(cds)("Loaded heap region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT
1653 " size " SIZE_FORMAT_W(6) " delta " INTX_FORMAT,
1654 ri->_region_index, load_address, load_address + ri->_region_size,
1655 ri->_region_size, ri->_runtime_offset);
1656
1657 uintptr_t oopmap = bitmap_base + r->oopmap_offset();
1658 BitMapView bm((BitMap::bm_word_t*)oopmap, r->oopmap_size_in_bits());
1659
1660 if (num_loaded_regions == 4) {
1661 PatchLoadedRegionPointers<4> patcher((narrowOop*)load_address, loaded_regions);
1662 bm.iterate(&patcher);
1663 } else if (num_loaded_regions == 3) {
1664 PatchLoadedRegionPointers<3> patcher((narrowOop*)load_address, loaded_regions);
1665 bm.iterate(&patcher);
1666 } else {
1667 assert(num_loaded_regions == 2, "must be");
1668 PatchLoadedRegionPointers<2> patcher((narrowOop*)load_address, loaded_regions);
1669 bm.iterate(&patcher);
1670 }
1671
1672 load_address += r->used();
1673 }
1674
1675 return true;
1676 }
1677
1678 bool HeapShared::load_heap_regions(FileMapInfo* mapinfo) {
1679 init_narrow_oop_decoding(mapinfo->narrow_oop_base(), mapinfo->narrow_oop_shift());
1680
1681 LoadedArchiveHeapRegion loaded_regions[MetaspaceShared::max_num_heap_regions];
1682 memset(loaded_regions, 0, sizeof(loaded_regions));
1683
1684 MemRegion archive_space;
1685 int num_loaded_regions = init_loaded_regions(mapinfo, loaded_regions, archive_space);
1686 if (num_loaded_regions <= 0) {
1687 return false;
1688 }
1689 sort_loaded_regions(loaded_regions, num_loaded_regions, (uintptr_t)archive_space.start());
1690 if (!load_regions(mapinfo, loaded_regions, num_loaded_regions, (uintptr_t)archive_space.start())) {
1691 assert(_loading_failed, "must be");
1692 return false;
1693 }
1694
1695 init_loaded_heap_relocation(loaded_regions, num_loaded_regions);
1696 _is_loaded = true;
1697 set_roots(mapinfo->heap_obj_roots());
1698
1699 return true;
1700 }
1701
1702 class VerifyLoadedHeapEmbeddedPointers: public BasicOopIterateClosure {
1703 ResourceHashtable<uintptr_t, bool>* _table;
1704
1705 public:
1706 VerifyLoadedHeapEmbeddedPointers(ResourceHashtable<uintptr_t, bool>* table) : _table(table) {}
1707
1708 virtual void do_oop(narrowOop* p) {
1709 // This should be called before the loaded regions are modified, so all the embedded pointers
1710 // must be NULL, or must point to a valid object in the loaded regions.
1711 narrowOop v = *p;
1712 if (!CompressedOops::is_null(v)) {
1713 oop o = CompressedOops::decode_not_null(v);
1714 uintptr_t u = cast_from_oop<uintptr_t>(o);
1715 HeapShared::assert_in_loaded_heap(u);
1716 guarantee(_table->contains(u), "must point to beginning of object in loaded archived regions");
1717 }
1718 }
1719 virtual void do_oop(oop* p) {
1720 ShouldNotReachHere();
1721 }
1722 };
1723
1724 void HeapShared::finish_initialization() {
1725 if (is_loaded()) {
1726 HeapWord* bottom = (HeapWord*)_loaded_heap_bottom;
1727 HeapWord* top = (HeapWord*)_loaded_heap_top;
1728
1729 MemRegion archive_space = MemRegion(bottom, top);
1730 Universe::heap()->complete_loaded_archive_space(archive_space);
1731 }
1732
1733 if (VerifyArchivedFields <= 0 || !is_loaded()) {
1734 return;
1735 }
1736
1737 log_info(cds, heap)("Verify all oops and pointers in loaded heap");
1738
1739 ResourceMark rm;
1740 ResourceHashtable<uintptr_t, bool> table;
1741 VerifyLoadedHeapEmbeddedPointers verifier(&table);
1742 HeapWord* bottom = (HeapWord*)_loaded_heap_bottom;
1743 HeapWord* top = (HeapWord*)_loaded_heap_top;
1744
1745 for (HeapWord* p = bottom; p < top; ) {
1746 oop o = cast_to_oop(p);
1747 table.put(cast_from_oop<uintptr_t>(o), true);
1748 p += o->size();
1749 }
1750
1751 for (HeapWord* p = bottom; p < top; ) {
1752 oop o = cast_to_oop(p);
1753 o->oop_iterate(&verifier);
1754 p += o->size();
1755 }
1756 }
1757
1758 void HeapShared::fill_failed_loaded_region() {
1759 assert(_loading_failed, "must be");
1760 if (_loaded_heap_bottom != 0) {
1761 assert(_loaded_heap_top != 0, "must be");
1762 HeapWord* bottom = (HeapWord*)_loaded_heap_bottom;
1763 HeapWord* top = (HeapWord*)_loaded_heap_top;
1764 Universe::heap()->fill_with_objects(bottom, top - bottom);
1765 }
1766 }
1767
1768 #endif // INCLUDE_CDS_JAVA_HEAP