1 /*
2 * Copyright (c) 2025, 2026, 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 "cds/aotReferenceObjSupport.hpp"
26 #include "cds/aotStreamedHeapWriter.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "cds/heapShared.inline.hpp"
30 #include "cds/regeneratedClasses.hpp"
31 #include "classfile/modules.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "gc/shared/collectedHeap.hpp"
35 #include "memory/iterator.inline.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.hpp"
38 #include "oops/compressedOops.hpp"
39 #include "oops/objArrayOop.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "oops/oopHandle.inline.hpp"
42 #include "oops/typeArrayKlass.hpp"
43 #include "oops/typeArrayOop.hpp"
44 #include "runtime/java.hpp"
45 #include "runtime/mutexLocker.hpp"
46 #include "utilities/bitMap.inline.hpp"
47 #include "utilities/stack.inline.hpp"
48
49 #if INCLUDE_CDS_JAVA_HEAP
50
51 GrowableArrayCHeap<u1, mtClassShared>* AOTStreamedHeapWriter::_buffer = nullptr;
52
53 // The following are offsets from buffer_bottom()
54 size_t AOTStreamedHeapWriter::_buffer_used;
55 size_t AOTStreamedHeapWriter::_roots_offset;
56 size_t AOTStreamedHeapWriter::_forwarding_offset;
57 size_t AOTStreamedHeapWriter::_root_highest_object_index_table_offset;
58
59 GrowableArrayCHeap<oop, mtClassShared>* AOTStreamedHeapWriter::_source_objs;
60
61 AOTStreamedHeapWriter::BufferOffsetToSourceObjectTable* AOTStreamedHeapWriter::_buffer_offset_to_source_obj_table;
62 AOTStreamedHeapWriter::SourceObjectToDFSOrderTable* AOTStreamedHeapWriter::_dfs_order_table;
63
64 int* AOTStreamedHeapWriter::_roots_highest_dfs;
65 size_t* AOTStreamedHeapWriter::_dfs_to_archive_object_table;
66
67 static const int max_table_capacity = 0x3fffffff;
68
69 void AOTStreamedHeapWriter::init() {
70 if (CDSConfig::is_dumping_heap()) {
71 _buffer_offset_to_source_obj_table = new (mtClassShared) BufferOffsetToSourceObjectTable(8, max_table_capacity);
72
73 int initial_source_objs_capacity = 10000;
74 _source_objs = new GrowableArrayCHeap<oop, mtClassShared>(initial_source_objs_capacity);
75 }
76 }
77
78 void AOTStreamedHeapWriter::delete_tables_with_raw_oops() {
79 delete _source_objs;
80 _source_objs = nullptr;
81
82 delete _dfs_order_table;
83 _dfs_order_table = nullptr;
84 }
85
86 void AOTStreamedHeapWriter::add_source_obj(oop src_obj) {
87 _source_objs->append(src_obj);
88 }
89
90 class FollowOopIterateClosure: public BasicOopIterateClosure {
91 Stack<oop, mtClassShared>* _dfs_stack;
92 oop _src_obj;
93 bool _is_java_lang_ref;
94
95 public:
96 FollowOopIterateClosure(Stack<oop, mtClassShared>* dfs_stack, oop src_obj, bool is_java_lang_ref) :
97 _dfs_stack(dfs_stack),
98 _src_obj(src_obj),
99 _is_java_lang_ref(is_java_lang_ref) {}
100
101 void do_oop(narrowOop *p) { do_oop_work(p); }
102 void do_oop( oop *p) { do_oop_work(p); }
103
104 private:
105 template <class T> void do_oop_work(T *p) {
106 size_t field_offset = pointer_delta(p, _src_obj, sizeof(char));
107 oop obj = HeapShared::maybe_remap_referent(_is_java_lang_ref, field_offset, HeapAccess<>::oop_load(p));
108 if (obj != nullptr) {
109 _dfs_stack->push(obj);
110 }
111 }
112 };
113
114 int AOTStreamedHeapWriter::cmp_dfs_order(oop* o1, oop* o2) {
115 int* o1_dfs = _dfs_order_table->get(*o1);
116 int* o2_dfs = _dfs_order_table->get(*o2);
117 return *o1_dfs - *o2_dfs;
118 }
119
120 void AOTStreamedHeapWriter::order_source_objs(GrowableArrayCHeap<oop, mtClassShared>* roots) {
121 Stack<oop, mtClassShared> dfs_stack;
122 _dfs_order_table = new (mtClassShared) SourceObjectToDFSOrderTable(8, max_table_capacity);
123 _roots_highest_dfs = NEW_C_HEAP_ARRAY(int, (size_t)roots->length(), mtClassShared);
124 _dfs_to_archive_object_table = NEW_C_HEAP_ARRAY(size_t, (size_t)_source_objs->length() + 1, mtClassShared);
125
126 for (int i = 0; i < _source_objs->length(); ++i) {
127 oop obj = _source_objs->at(i);
128 _dfs_order_table->put(cast_from_oop<void*>(obj), -1);
129 _dfs_order_table->maybe_grow();
130 }
131
132 int dfs_order = 0;
133
134 for (int i = 0; i < roots->length(); ++i) {
135 oop root = roots->at(i);
136
137 if (root == nullptr) {
138 log_info(aot, heap)("null root at %d", i);
139 continue;
140 }
141
142 dfs_stack.push(root);
143
144 while (!dfs_stack.is_empty()) {
145 oop obj = dfs_stack.pop();
146 assert(obj != nullptr, "null root");
147 int* dfs_number = _dfs_order_table->get(cast_from_oop<void*>(obj));
148 if (*dfs_number != -1) {
149 // Already visited in the traversal
150 continue;
151 }
152 _dfs_order_table->put(cast_from_oop<void*>(obj), ++dfs_order);
153 _dfs_order_table->maybe_grow();
154
155 FollowOopIterateClosure cl(&dfs_stack, obj, AOTReferenceObjSupport::check_if_ref_obj(obj));
156 obj->oop_iterate(&cl);
157 }
158
159 _roots_highest_dfs[i] = dfs_order;
160 }
161
162 _source_objs->sort(cmp_dfs_order);
163 }
164
165 void AOTStreamedHeapWriter::write(GrowableArrayCHeap<oop, mtClassShared>* roots,
166 ArchiveStreamedHeapInfo* heap_info) {
167 assert(CDSConfig::is_dumping_heap(), "sanity");
168 allocate_buffer();
169 order_source_objs(roots);
170 copy_source_objs_to_buffer(roots);
171 map_embedded_oops(heap_info);
172 populate_archive_heap_info(heap_info);
173 }
174
175 void AOTStreamedHeapWriter::allocate_buffer() {
176 int initial_buffer_size = 100000;
177 _buffer = new GrowableArrayCHeap<u1, mtClassShared>(initial_buffer_size);
178 _buffer_used = 0;
179 ensure_buffer_space(1); // so that buffer_bottom() works
180 }
181
182 void AOTStreamedHeapWriter::ensure_buffer_space(size_t min_bytes) {
183 // We usually have very small heaps. If we get a huge one it's probably caused by a bug.
184 guarantee(min_bytes <= max_jint, "we dont support archiving more than 2G of objects");
185 _buffer->at_grow(to_array_index(min_bytes));
186 }
187
188 void AOTStreamedHeapWriter::copy_roots_to_buffer(GrowableArrayCHeap<oop, mtClassShared>* roots) {
189 int length = roots->length();
190 size_t byte_size = align_up(sizeof(int) + sizeof(int) * (size_t)length, (size_t)HeapWordSize);
191
192 size_t new_used = _buffer_used + byte_size;
193 ensure_buffer_space(new_used);
194
195 int* mem = offset_to_buffered_address<int*>(_buffer_used);
196 memset(mem, 0, byte_size);
197 *mem = length;
198
199 for (int i = 0; i < length; i++) {
200 // Do not use arrayOop->obj_at_put(i, o) as arrayOop is outside of the real heap!
201 oop o = roots->at(i);
202 int dfs_index = o == nullptr ? 0 : *_dfs_order_table->get(cast_from_oop<void*>(o));
203 mem[i + 1] = dfs_index;
204 }
205 log_info(aot, heap)("archived obj roots[%d] = %zu bytes, mem = %p", length, byte_size, mem);
206
207 _roots_offset = _buffer_used;
208 _buffer_used = new_used;
209 }
210
211 template <typename T>
212 void AOTStreamedHeapWriter::write(T value) {
213 size_t new_used = _buffer_used + sizeof(T);
214 ensure_buffer_space(new_used);
215 T* mem = offset_to_buffered_address<T*>(_buffer_used);
216 *mem = value;
217 _buffer_used = new_used;
218 }
219
220 void AOTStreamedHeapWriter::copy_forwarding_to_buffer() {
221 _forwarding_offset = _buffer_used;
222
223 write<size_t>(0); // The first entry is the null entry
224
225 // Write a mapping from object index to buffer offset
226 for (int i = 1; i <= _source_objs->length(); i++) {
227 size_t buffer_offset = _dfs_to_archive_object_table[i];
228 write(buffer_offset);
229 }
230 }
231
232 void AOTStreamedHeapWriter::copy_roots_max_dfs_to_buffer(int roots_length) {
233 _root_highest_object_index_table_offset = _buffer_used;
234
235 for (int i = 0; i < roots_length; ++i) {
236 int highest_dfs = _roots_highest_dfs[i];
237 write(highest_dfs);
238 }
239
240 if ((roots_length % 2) != 0) {
241 write(-1); // Align up to a 64 bit word
242 }
243 }
244
245 static BitMap::idx_t bit_idx_for_buffer_offset(size_t buffer_offset) {
246 if (UseCompressedOops) {
247 return BitMap::idx_t(buffer_offset / sizeof(narrowOop));
248 } else {
249 return BitMap::idx_t(buffer_offset / sizeof(HeapWord));
250 }
251 }
252
253 void AOTStreamedHeapWriter::copy_source_objs_to_buffer(GrowableArrayCHeap<oop, mtClassShared>* roots) {
254 for (int i = 0; i < _source_objs->length(); i++) {
255 oop src_obj = _source_objs->at(i);
256 HeapShared::CachedOopInfo* info = HeapShared::get_cached_oop_info(src_obj);
257 assert(info != nullptr, "must be");
258 size_t buffer_offset = copy_one_source_obj_to_buffer(src_obj);
259 info->set_buffer_offset(buffer_offset);
260
261 OopHandle handle(Universe::vm_global(), src_obj);
262 _buffer_offset_to_source_obj_table->put_when_absent(buffer_offset, handle);
263 _buffer_offset_to_source_obj_table->maybe_grow();
264
265 int dfs_order = i + 1;
266 _dfs_to_archive_object_table[dfs_order] = buffer_offset;
267 }
268
269 copy_roots_to_buffer(roots);
270 copy_forwarding_to_buffer();
271 copy_roots_max_dfs_to_buffer(roots->length());
272
273 log_info(aot)("Size of heap region = %zu bytes, %d objects, %d roots",
274 _buffer_used, _source_objs->length() + 1, roots->length());
275 }
276
277 template <typename T>
278 void update_buffered_object_field(address buffered_obj, int field_offset, T value) {
279 T* field_addr = cast_to_oop(buffered_obj)->field_addr<T>(field_offset);
280 *field_addr = value;
281 }
282
283 static bool needs_explicit_size(oop src_obj) {
284 Klass* klass = src_obj->klass();
285 int lh = klass->layout_helper();
286
287 // Simple instances or arrays don't need explicit size
288 if (Klass::layout_helper_is_instance(lh)) {
289 return Klass::layout_helper_needs_slow_path(lh);
290 }
291
292 return !Klass::layout_helper_is_array(lh);
293 }
294
295 size_t AOTStreamedHeapWriter::copy_one_source_obj_to_buffer(oop src_obj) {
296 if (needs_explicit_size(src_obj)) {
297 // Explicitly write object size for more complex objects, to avoid having to
298 // pretend the buffer objects are objects when loading the objects, in order
299 // to read the size. Most of the time, the layout helper of the class is enough.
300 write<size_t>(src_obj->size());
301 }
302 size_t byte_size = src_obj->size() * HeapWordSize;
303 assert(byte_size > 0, "no zero-size objects");
304
305 size_t new_used = _buffer_used + byte_size;
306 assert(new_used > _buffer_used, "no wrap around");
307
308 ensure_buffer_space(new_used);
309
310 if (HeapShared::is_interned_string(src_obj)) {
311 java_lang_String::hash_code(src_obj); // Sets the hash code field(s)
312 java_lang_String::set_deduplication_forbidden(src_obj); // Allows faster interning at runtime
313 assert(java_lang_String::hash_is_set(src_obj), "hash must be set");
314 }
315
316 address from = cast_from_oop<address>(src_obj);
317 address to = offset_to_buffered_address<address>(_buffer_used);
318 assert(is_object_aligned(_buffer_used), "sanity");
319 assert(is_object_aligned(byte_size), "sanity");
320 memcpy(to, from, byte_size);
321
322 if (java_lang_Module::is_instance(src_obj)) {
323 // These native pointers will be restored explicitly at run time.
324 Modules::check_archived_module_oop(src_obj);
325 update_buffered_object_field<ModuleEntry*>(to, java_lang_Module::module_entry_offset(), nullptr);
326 } else if (java_lang_ClassLoader::is_instance(src_obj)) {
327 #ifdef ASSERT
328 // We only archive these loaders
329 if (src_obj != SystemDictionary::java_platform_loader() &&
330 src_obj != SystemDictionary::java_system_loader()) {
331 assert(src_obj->klass()->name()->equals("jdk/internal/loader/ClassLoaders$BootClassLoader"), "must be");
332 }
333 #endif
334 update_buffered_object_field<ClassLoaderData*>(to, java_lang_ClassLoader::loader_data_offset(), nullptr);
335 }
336
337 size_t buffered_obj_offset = _buffer_used;
338 _buffer_used = new_used;
339
340 return buffered_obj_offset;
341 }
342
343 // Oop mapping
344
345 inline void AOTStreamedHeapWriter::store_oop_in_buffer(oop* buffered_addr, int dfs_index) {
346 *(ssize_t*)buffered_addr = dfs_index;
347 }
348
349 inline void AOTStreamedHeapWriter::store_oop_in_buffer(narrowOop* buffered_addr, int dfs_index) {
350 *(int32_t*)buffered_addr = (int32_t)dfs_index;
351 }
352
353 template <typename T> void AOTStreamedHeapWriter::mark_oop_pointer(T* buffered_addr, CHeapBitMap* oopmap) {
354 // Mark the pointer in the oopmap
355 size_t buffered_offset = buffered_address_to_offset((address)buffered_addr);
356 BitMap::idx_t idx = bit_idx_for_buffer_offset(buffered_offset);
357 oopmap->set_bit(idx);
358 }
359
360 template <typename T> void AOTStreamedHeapWriter::map_oop_field_in_buffer(oop obj, T* field_addr_in_buffer, CHeapBitMap* oopmap) {
361 if (obj == nullptr) {
362 store_oop_in_buffer(field_addr_in_buffer, 0);
363 } else {
364 int dfs_index = *_dfs_order_table->get(obj);
365 store_oop_in_buffer(field_addr_in_buffer, dfs_index);
366 }
367
368 mark_oop_pointer<T>(field_addr_in_buffer, oopmap);
369 }
370
371 void AOTStreamedHeapWriter::update_header_for_buffered_addr(address buffered_addr, oop src_obj, Klass* src_klass) {
372 assert(UseCompressedClassPointers, "Archived heap only supported for compressed klasses");
373 narrowKlass nk = ArchiveBuilder::current()->get_requested_narrow_klass(src_klass);
374
375 markWord mw = markWord::prototype();
376 oopDesc* fake_oop = (oopDesc*)buffered_addr;
377
378 // We need to retain the identity_hash, because it may have been used by some hashtables
379 // in the shared heap. This also has the side effect of pre-initializing the
380 // identity_hash for all shared objects, so they are less likely to be written
381 // into during run time, increasing the potential of memory sharing.
382 if (src_obj != nullptr) {
383 intptr_t src_hash = src_obj->identity_hash();
384 mw = mw.copy_set_hash(src_hash);
385 }
386
387 if (HeapShared::is_interned_string(src_obj)) {
388 // Mark the mark word of interned string so the loader knows to link these to
389 // the string table at runtime.
390 mw = mw.set_marked();
391 }
392
393 if (UseCompactObjectHeaders) {
394 fake_oop->set_mark(mw.set_narrow_klass(nk));
395 } else {
396 fake_oop->set_mark(mw);
397 fake_oop->set_narrow_klass(nk);
398 }
399 }
400
401 class AOTStreamedHeapWriter::EmbeddedOopMapper: public BasicOopIterateClosure {
402 oop _src_obj;
403 address _buffered_obj;
404 CHeapBitMap* _oopmap;
405 bool _is_java_lang_ref;
406
407 public:
408 EmbeddedOopMapper(oop src_obj, address buffered_obj, CHeapBitMap* oopmap)
409 : _src_obj(src_obj),
410 _buffered_obj(buffered_obj),
411 _oopmap(oopmap),
412 _is_java_lang_ref(AOTReferenceObjSupport::check_if_ref_obj(src_obj)) {}
413
414 void do_oop(narrowOop *p) { EmbeddedOopMapper::do_oop_work(p); }
415 void do_oop( oop *p) { EmbeddedOopMapper::do_oop_work(p); }
416
417 private:
418 template <typename T>
419 void do_oop_work(T *p) {
420 size_t field_offset = pointer_delta(p, _src_obj, sizeof(char));
421 oop obj = HeapShared::maybe_remap_referent(_is_java_lang_ref, field_offset, HeapAccess<>::oop_load(p));
422 AOTStreamedHeapWriter::map_oop_field_in_buffer<T>(obj, (T*)(_buffered_obj + field_offset), _oopmap);
423 }
424 };
425
426 static void log_bitmap_usage(const char* which, BitMap* bitmap, size_t total_bits) {
427 // The whole heap is covered by total_bits, but there are only non-zero bits within [start ... end).
428 size_t start = bitmap->find_first_set_bit(0);
429 size_t end = bitmap->size();
430 log_info(aot)("%s = %7zu ... %7zu (%3zu%% ... %3zu%% = %3zu%%)", which,
431 start, end,
432 start * 100 / total_bits,
433 end * 100 / total_bits,
434 (end - start) * 100 / total_bits);
435 }
436
437 // Update all oop fields embedded in the buffered objects
438 void AOTStreamedHeapWriter::map_embedded_oops(ArchiveStreamedHeapInfo* heap_info) {
439 size_t oopmap_unit = (UseCompressedOops ? sizeof(narrowOop) : sizeof(oop));
440 size_t heap_region_byte_size = _buffer_used;
441 heap_info->oopmap()->resize(heap_region_byte_size / oopmap_unit);
442
443 for (int i = 0; i < _source_objs->length(); i++) {
444 oop src_obj = _source_objs->at(i);
445 HeapShared::CachedOopInfo* info = HeapShared::get_cached_oop_info(src_obj);
446 assert(info != nullptr, "must be");
447 address buffered_obj = offset_to_buffered_address<address>(info->buffer_offset());
448
449 update_header_for_buffered_addr(buffered_obj, src_obj, src_obj->klass());
450
451 EmbeddedOopMapper mapper(src_obj, buffered_obj, heap_info->oopmap());
452 src_obj->oop_iterate(&mapper);
453 HeapShared::remap_dumped_metadata(src_obj, buffered_obj);
454 };
455
456 size_t total_bytes = (size_t)_buffer->length();
457 log_bitmap_usage("oopmap", heap_info->oopmap(), total_bytes / oopmap_unit);
458 }
459
460 size_t AOTStreamedHeapWriter::source_obj_to_buffered_offset(oop src_obj) {
461 HeapShared::CachedOopInfo* p = HeapShared::get_cached_oop_info(src_obj);
462 return p->buffer_offset();
463 }
464
465 address AOTStreamedHeapWriter::source_obj_to_buffered_addr(oop src_obj) {
466 return offset_to_buffered_address<address>(source_obj_to_buffered_offset(src_obj));
467 }
468
469 oop AOTStreamedHeapWriter::buffered_offset_to_source_obj(size_t buffered_offset) {
470 OopHandle* oh = _buffer_offset_to_source_obj_table->get(buffered_offset);
471 if (oh != nullptr) {
472 return oh->resolve();
473 } else {
474 return nullptr;
475 }
476 }
477
478 oop AOTStreamedHeapWriter::buffered_addr_to_source_obj(address buffered_addr) {
479 return buffered_offset_to_source_obj(buffered_address_to_offset(buffered_addr));
480 }
481
482 void AOTStreamedHeapWriter::populate_archive_heap_info(ArchiveStreamedHeapInfo* info) {
483 assert(!info->is_used(), "only set once");
484
485 size_t heap_region_byte_size = _buffer_used;
486 assert(heap_region_byte_size > 0, "must archived at least one object!");
487
488 info->set_buffer_region(MemRegion(offset_to_buffered_address<HeapWord*>(0),
489 offset_to_buffered_address<HeapWord*>(_buffer_used)));
490 info->set_roots_offset(_roots_offset);
491 info->set_num_roots((size_t)HeapShared::pending_roots()->length());
492 info->set_forwarding_offset(_forwarding_offset);
493 info->set_root_highest_object_index_table_offset(_root_highest_object_index_table_offset);
494 info->set_num_archived_objects((size_t)_source_objs->length());
495 }
496
497 AOTMapLogger::OopDataIterator* AOTStreamedHeapWriter::oop_iterator(ArchiveStreamedHeapInfo* heap_info) {
498 class StreamedWriterOopIterator : public AOTMapLogger::OopDataIterator {
499 private:
500 int _current;
501 int _next;
502
503 address _buffer_start;
504
505 int _num_archived_objects;
506 int _num_archived_roots;
507 int* _roots;
508
509 public:
510 StreamedWriterOopIterator(address buffer_start,
511 int num_archived_objects,
512 int num_archived_roots,
513 int* roots)
514 : _current(0),
515 _next(1),
516 _buffer_start(buffer_start),
517 _num_archived_objects(num_archived_objects),
518 _num_archived_roots(num_archived_roots),
519 _roots(roots) {
520 }
521
522 AOTMapLogger::OopData capture(int dfs_index) {
523 size_t buffered_offset = _dfs_to_archive_object_table[dfs_index];
524 address buffered_addr = _buffer_start + buffered_offset;
525 oop src_obj = AOTStreamedHeapWriter::buffered_offset_to_source_obj(buffered_offset);
526 assert(src_obj != nullptr, "why is this null?");
527 oopDesc* raw_oop = (oopDesc*)buffered_addr;
528 Klass* klass = src_obj->klass();
529 size_t size = src_obj->size();
530
531 intptr_t target_location = (intptr_t)buffered_offset;
532 uint32_t narrow_location = checked_cast<uint32_t>(dfs_index);
533
534 address requested_addr = (address)buffered_offset;
535
536 return { buffered_addr,
537 requested_addr,
538 target_location,
539 narrow_location,
540 raw_oop,
541 klass,
542 size,
543 false };
544 }
545
546 bool has_next() override {
547 return _next <= _num_archived_objects;
548 }
549
550 AOTMapLogger::OopData next() override {
551 _current = _next;
552 AOTMapLogger::OopData result = capture(_current);
553 _next = _current + 1;
554 return result;
555 }
556
557 AOTMapLogger::OopData obj_at(narrowOop* addr) override {
558 int dfs_index = (int)(*addr);
559 if (dfs_index == 0) {
560 return null_data();
561 } else {
562 return capture(dfs_index);
563 }
564 }
565
566 AOTMapLogger::OopData obj_at(oop* addr) override {
567 int dfs_index = (int)cast_from_oop<uintptr_t>(*addr);
568 if (dfs_index == 0) {
569 return null_data();
570 } else {
571 return capture(dfs_index);
572 }
573 }
574
575 GrowableArrayCHeap<AOTMapLogger::OopData, mtClass>* roots() override {
576 GrowableArrayCHeap<AOTMapLogger::OopData, mtClass>* result = new GrowableArrayCHeap<AOTMapLogger::OopData, mtClass>();
577
578 for (int i = 0; i < _num_archived_roots; ++i) {
579 int object_index = _roots[i];
580 result->append(capture(object_index));
581 }
582
583 return result;
584 }
585 };
586
587 MemRegion r = heap_info->buffer_region();
588 address buffer_start = address(r.start());
589
590 size_t roots_offset = heap_info->roots_offset();
591 int* roots = ((int*)(buffer_start + roots_offset)) + 1;
592
593 return new StreamedWriterOopIterator(buffer_start, (int)heap_info->num_archived_objects(), (int)heap_info->num_roots(), roots);
594 }
595
596 #endif // INCLUDE_CDS_JAVA_HEAP