1 /*
2 * Copyright (c) 2020, 2024, 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/aotClassLinker.hpp"
27 #include "cds/aotLinkedClassBulkLoader.hpp"
28 #include "cds/archiveBuilder.hpp"
29 #include "cds/archiveHeapWriter.hpp"
30 #include "cds/archiveUtils.hpp"
31 #include "cds/cdsConfig.hpp"
32 #include "cds/cppVtables.hpp"
33 #include "cds/dumpAllocStats.hpp"
34 #include "cds/dynamicArchive.hpp"
35 #include "cds/heapShared.hpp"
36 #include "cds/metaspaceShared.hpp"
37 #include "cds/regeneratedClasses.hpp"
38 #include "classfile/classLoader.hpp"
39 #include "classfile/classLoaderDataShared.hpp"
40 #include "classfile/classLoaderExt.hpp"
41 #include "classfile/javaClasses.hpp"
42 #include "classfile/symbolTable.hpp"
43 #include "classfile/systemDictionaryShared.hpp"
44 #include "classfile/vmClasses.hpp"
45 #include "interpreter/abstractInterpreter.hpp"
46 #include "jvm.h"
47 #include "logging/log.hpp"
48 #include "logging/logStream.hpp"
49 #include "memory/allStatic.hpp"
50 #include "memory/memRegion.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "oops/compressedKlass.inline.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/objArrayKlass.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oopHandle.inline.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/fieldDescriptor.inline.hpp"
59 #include "runtime/globals_extension.hpp"
60 #include "runtime/javaThread.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "utilities/align.hpp"
63 #include "utilities/bitMap.inline.hpp"
64 #include "utilities/formatBuffer.hpp"
65
66 ArchiveBuilder* ArchiveBuilder::_current = nullptr;
67
68 ArchiveBuilder::OtherROAllocMark::~OtherROAllocMark() {
69 char* newtop = ArchiveBuilder::current()->_ro_region.top();
70 ArchiveBuilder::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
71 }
72
73 ArchiveBuilder::SourceObjList::SourceObjList() : _ptrmap(16 * K, mtClassShared) {
74 _total_bytes = 0;
75 _objs = new (mtClassShared) GrowableArray<SourceObjInfo*>(128 * K, mtClassShared);
76 }
77
78 ArchiveBuilder::SourceObjList::~SourceObjList() {
79 delete _objs;
80 }
81
82 void ArchiveBuilder::SourceObjList::append(SourceObjInfo* src_info) {
83 // Save this source object for copying
84 src_info->set_id(_objs->length());
85 _objs->append(src_info);
86
87 // Prepare for marking the pointers in this source object
88 assert(is_aligned(_total_bytes, sizeof(address)), "must be");
89 src_info->set_ptrmap_start(_total_bytes / sizeof(address));
90 _total_bytes = align_up(_total_bytes + (uintx)src_info->size_in_bytes(), sizeof(address));
91 src_info->set_ptrmap_end(_total_bytes / sizeof(address));
92
93 BitMap::idx_t bitmap_size_needed = BitMap::idx_t(src_info->ptrmap_end());
94 if (_ptrmap.size() <= bitmap_size_needed) {
95 _ptrmap.resize((bitmap_size_needed + 1) * 2);
96 }
97 }
98
99 void ArchiveBuilder::SourceObjList::remember_embedded_pointer(SourceObjInfo* src_info, MetaspaceClosure::Ref* ref) {
100 // src_obj contains a pointer. Remember the location of this pointer in _ptrmap,
101 // so that we can copy/relocate it later.
102 src_info->set_has_embedded_pointer();
103 address src_obj = src_info->source_addr();
104 address* field_addr = ref->addr();
105 assert(src_info->ptrmap_start() < _total_bytes, "sanity");
106 assert(src_info->ptrmap_end() <= _total_bytes, "sanity");
107 assert(*field_addr != nullptr, "should have checked");
108
109 intx field_offset_in_bytes = ((address)field_addr) - src_obj;
110 DEBUG_ONLY(int src_obj_size = src_info->size_in_bytes();)
111 assert(field_offset_in_bytes >= 0, "must be");
112 assert(field_offset_in_bytes + intx(sizeof(intptr_t)) <= intx(src_obj_size), "must be");
113 assert(is_aligned(field_offset_in_bytes, sizeof(address)), "must be");
114
115 BitMap::idx_t idx = BitMap::idx_t(src_info->ptrmap_start() + (uintx)(field_offset_in_bytes / sizeof(address)));
116 _ptrmap.set_bit(BitMap::idx_t(idx));
117 }
118
119 class RelocateEmbeddedPointers : public BitMapClosure {
120 ArchiveBuilder* _builder;
121 address _buffered_obj;
122 BitMap::idx_t _start_idx;
123 public:
124 RelocateEmbeddedPointers(ArchiveBuilder* builder, address buffered_obj, BitMap::idx_t start_idx) :
125 _builder(builder), _buffered_obj(buffered_obj), _start_idx(start_idx) {}
126
127 bool do_bit(BitMap::idx_t bit_offset) {
128 size_t field_offset = size_t(bit_offset - _start_idx) * sizeof(address);
129 address* ptr_loc = (address*)(_buffered_obj + field_offset);
130
131 address old_p = *ptr_loc;
132 address new_p = _builder->get_buffered_addr(old_p);
133
134 log_trace(cds)("Ref: [" PTR_FORMAT "] -> " PTR_FORMAT " => " PTR_FORMAT,
135 p2i(ptr_loc), p2i(old_p), p2i(new_p));
136
137 ArchivePtrMarker::set_and_mark_pointer(ptr_loc, new_p);
138 return true; // keep iterating the bitmap
139 }
140 };
141
142 void ArchiveBuilder::SourceObjList::relocate(int i, ArchiveBuilder* builder) {
143 SourceObjInfo* src_info = objs()->at(i);
144 assert(src_info->should_copy(), "must be");
145 BitMap::idx_t start = BitMap::idx_t(src_info->ptrmap_start()); // inclusive
146 BitMap::idx_t end = BitMap::idx_t(src_info->ptrmap_end()); // exclusive
147
148 RelocateEmbeddedPointers relocator(builder, src_info->buffered_addr(), start);
149 _ptrmap.iterate(&relocator, start, end);
150 }
151
152 ArchiveBuilder::ArchiveBuilder() :
153 _current_dump_region(nullptr),
154 _buffer_bottom(nullptr),
155 _last_verified_top(nullptr),
156 _num_dump_regions_used(0),
157 _other_region_used_bytes(0),
158 _requested_static_archive_bottom(nullptr),
159 _requested_static_archive_top(nullptr),
160 _requested_dynamic_archive_bottom(nullptr),
161 _requested_dynamic_archive_top(nullptr),
162 _mapped_static_archive_bottom(nullptr),
163 _mapped_static_archive_top(nullptr),
164 _buffer_to_requested_delta(0),
165 _rw_region("rw", MAX_SHARED_DELTA),
166 _ro_region("ro", MAX_SHARED_DELTA),
167 _ptrmap(mtClassShared),
168 _rw_ptrmap(mtClassShared),
169 _ro_ptrmap(mtClassShared),
170 _rw_src_objs(),
171 _ro_src_objs(),
172 _src_obj_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
173 _buffered_to_src_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
174 _total_heap_region_size(0),
175 _estimated_metaspaceobj_bytes(0),
176 _estimated_hashtable_bytes(0)
177 {
178 _klasses = new (mtClassShared) GrowableArray<Klass*>(4 * K, mtClassShared);
179 _symbols = new (mtClassShared) GrowableArray<Symbol*>(256 * K, mtClassShared);
180 _entropy_seed = 0x12345678;
181 assert(_current == nullptr, "must be");
182 _current = this;
183 }
184
185 ArchiveBuilder::~ArchiveBuilder() {
186 assert(_current == this, "must be");
187 _current = nullptr;
188
189 for (int i = 0; i < _symbols->length(); i++) {
190 _symbols->at(i)->decrement_refcount();
191 }
192
193 delete _klasses;
194 delete _symbols;
195 if (_shared_rs.is_reserved()) {
196 _shared_rs.release();
197 }
198 }
199
200 // Returns a deterministic sequence of pseudo random numbers. The main purpose is NOT
201 // for randomness but to get good entropy for the identity_hash() of archived Symbols,
202 // while keeping the contents of static CDS archives deterministic to ensure
203 // reproducibility of JDK builds.
204 int ArchiveBuilder::entropy() {
205 assert(SafepointSynchronize::is_at_safepoint(), "needed to ensure deterministic sequence");
206 _entropy_seed = os::next_random(_entropy_seed);
207 return static_cast<int>(_entropy_seed);
208 }
209
210 class GatherKlassesAndSymbols : public UniqueMetaspaceClosure {
211 ArchiveBuilder* _builder;
212
213 public:
214 GatherKlassesAndSymbols(ArchiveBuilder* builder) : _builder(builder) {}
215
216 virtual bool do_unique_ref(Ref* ref, bool read_only) {
217 return _builder->gather_klass_and_symbol(ref, read_only);
218 }
219 };
220
221 bool ArchiveBuilder::gather_klass_and_symbol(MetaspaceClosure::Ref* ref, bool read_only) {
222 if (ref->obj() == nullptr) {
223 return false;
224 }
225 if (get_follow_mode(ref) != make_a_copy) {
226 return false;
227 }
228 if (ref->msotype() == MetaspaceObj::ClassType) {
229 Klass* klass = (Klass*)ref->obj();
230 assert(klass->is_klass(), "must be");
231 if (!is_excluded(klass)) {
232 _klasses->append(klass);
233 if (klass->is_hidden()) {
234 assert(klass->is_instance_klass(), "must be");
235 assert(SystemDictionaryShared::should_hidden_class_be_archived(InstanceKlass::cast(klass)), "must be");
236 }
237 }
238 // See RunTimeClassInfo::get_for(): make sure we have enough space for both maximum
239 // Klass alignment as well as the RuntimeInfo* pointer we will embed in front of a Klass.
240 _estimated_metaspaceobj_bytes += align_up(BytesPerWord, CompressedKlassPointers::klass_alignment_in_bytes()) +
241 align_up(sizeof(void*), SharedSpaceObjectAlignment);
242 } else if (ref->msotype() == MetaspaceObj::SymbolType) {
243 // Make sure the symbol won't be GC'ed while we are dumping the archive.
244 Symbol* sym = (Symbol*)ref->obj();
245 sym->increment_refcount();
246 _symbols->append(sym);
247 }
248
249 int bytes = ref->size() * BytesPerWord;
250 _estimated_metaspaceobj_bytes += align_up(bytes, SharedSpaceObjectAlignment);
251
252 return true; // recurse
253 }
254
255 void ArchiveBuilder::gather_klasses_and_symbols() {
256 ResourceMark rm;
257 log_info(cds)("Gathering classes and symbols ... ");
258 GatherKlassesAndSymbols doit(this);
259 iterate_roots(&doit);
260 #if INCLUDE_CDS_JAVA_HEAP
261 if (CDSConfig::is_dumping_full_module_graph()) {
262 ClassLoaderDataShared::iterate_symbols(&doit);
263 }
264 #endif
265 doit.finish();
266
267 if (CDSConfig::is_dumping_static_archive()) {
268 // To ensure deterministic contents in the static archive, we need to ensure that
269 // we iterate the MetaspaceObjs in a deterministic order. It doesn't matter where
270 // the MetaspaceObjs are located originally, as they are copied sequentially into
271 // the archive during the iteration.
272 //
273 // The only issue here is that the symbol table and the system directories may be
274 // randomly ordered, so we copy the symbols and klasses into two arrays and sort
275 // them deterministically.
276 //
277 // During -Xshare:dump, the order of Symbol creation is strictly determined by
278 // the SharedClassListFile (class loading is done in a single thread and the JIT
279 // is disabled). Also, Symbols are allocated in monotonically increasing addresses
280 // (see Symbol::operator new(size_t, int)). So if we iterate the Symbols by
281 // ascending address order, we ensure that all Symbols are copied into deterministic
282 // locations in the archive.
283 //
284 // TODO: in the future, if we want to produce deterministic contents in the
285 // dynamic archive, we might need to sort the symbols alphabetically (also see
286 // DynamicArchiveBuilder::sort_methods()).
287 log_info(cds)("Sorting symbols ... ");
288 _symbols->sort(compare_symbols_by_address);
289 sort_klasses();
290
291 // TODO -- we need a proper estimate for the archived modules, etc,
292 // but this should be enough for now
293 _estimated_metaspaceobj_bytes += 200 * 1024 * 1024;
294 }
295
296 AOTClassLinker::add_candidates();
297 }
298
299 int ArchiveBuilder::compare_symbols_by_address(Symbol** a, Symbol** b) {
300 if (a[0] < b[0]) {
301 return -1;
302 } else {
303 assert(a[0] > b[0], "Duplicated symbol %s unexpected", (*a)->as_C_string());
304 return 1;
305 }
306 }
307
308 int ArchiveBuilder::compare_klass_by_name(Klass** a, Klass** b) {
309 return a[0]->name()->fast_compare(b[0]->name());
310 }
311
312 void ArchiveBuilder::sort_klasses() {
313 log_info(cds)("Sorting classes ... ");
314 _klasses->sort(compare_klass_by_name);
315 }
316
317 size_t ArchiveBuilder::estimate_archive_size() {
318 // size of the symbol table and two dictionaries, plus the RunTimeClassInfo's
319 size_t symbol_table_est = SymbolTable::estimate_size_for_archive();
320 size_t dictionary_est = SystemDictionaryShared::estimate_size_for_archive();
321 _estimated_hashtable_bytes = symbol_table_est + dictionary_est;
322
323 if (CDSConfig::is_dumping_aot_linked_classes()) {
324 // This is difficult to estimate when dumping the dynamic archive, as the
325 // AOTLinkedClassTable may need to contain classes in the static archive as well.
326 //
327 // Just give a generous estimate for now. We will remove estimate_archive_size()
328 // in JDK-8340416
329 _estimated_hashtable_bytes += 20 * 1024 * 1024;
330 }
331
332 size_t total = 0;
333
334 total += _estimated_metaspaceobj_bytes;
335 total += _estimated_hashtable_bytes;
336
337 // allow fragmentation at the end of each dump region
338 total += _total_dump_regions * MetaspaceShared::core_region_alignment();
339
340 log_info(cds)("_estimated_hashtable_bytes = " SIZE_FORMAT " + " SIZE_FORMAT " = " SIZE_FORMAT,
341 symbol_table_est, dictionary_est, _estimated_hashtable_bytes);
342 log_info(cds)("_estimated_metaspaceobj_bytes = " SIZE_FORMAT, _estimated_metaspaceobj_bytes);
343 log_info(cds)("total estimate bytes = " SIZE_FORMAT, total);
344
345 return align_up(total, MetaspaceShared::core_region_alignment());
346 }
347
348 address ArchiveBuilder::reserve_buffer() {
349 size_t buffer_size = estimate_archive_size();
350 ReservedSpace rs(buffer_size, MetaspaceShared::core_region_alignment(), os::vm_page_size());
351 if (!rs.is_reserved()) {
352 log_error(cds)("Failed to reserve " SIZE_FORMAT " bytes of output buffer.", buffer_size);
353 MetaspaceShared::unrecoverable_writing_error();
354 }
355
356 // buffer_bottom is the lowest address of the 2 core regions (rw, ro) when
357 // we are copying the class metadata into the buffer.
358 address buffer_bottom = (address)rs.base();
359 log_info(cds)("Reserved output buffer space at " PTR_FORMAT " [" SIZE_FORMAT " bytes]",
360 p2i(buffer_bottom), buffer_size);
361 _shared_rs = rs;
362
363 _buffer_bottom = buffer_bottom;
364 _last_verified_top = buffer_bottom;
365 _current_dump_region = &_rw_region;
366 _num_dump_regions_used = 1;
367 _other_region_used_bytes = 0;
368 _current_dump_region->init(&_shared_rs, &_shared_vs);
369
370 ArchivePtrMarker::initialize(&_ptrmap, &_shared_vs);
371
372 // The bottom of the static archive should be mapped at this address by default.
373 _requested_static_archive_bottom = (address)MetaspaceShared::requested_base_address();
374
375 // The bottom of the archive (that I am writing now) should be mapped at this address by default.
376 address my_archive_requested_bottom;
377
378 if (CDSConfig::is_dumping_static_archive()) {
379 my_archive_requested_bottom = _requested_static_archive_bottom;
380 } else {
381 _mapped_static_archive_bottom = (address)MetaspaceObj::shared_metaspace_base();
382 _mapped_static_archive_top = (address)MetaspaceObj::shared_metaspace_top();
383 assert(_mapped_static_archive_top >= _mapped_static_archive_bottom, "must be");
384 size_t static_archive_size = _mapped_static_archive_top - _mapped_static_archive_bottom;
385
386 // At run time, we will mmap the dynamic archive at my_archive_requested_bottom
387 _requested_static_archive_top = _requested_static_archive_bottom + static_archive_size;
388 my_archive_requested_bottom = align_up(_requested_static_archive_top, MetaspaceShared::core_region_alignment());
389
390 _requested_dynamic_archive_bottom = my_archive_requested_bottom;
391 }
392
393 _buffer_to_requested_delta = my_archive_requested_bottom - _buffer_bottom;
394
395 address my_archive_requested_top = my_archive_requested_bottom + buffer_size;
396 if (my_archive_requested_bottom < _requested_static_archive_bottom ||
397 my_archive_requested_top <= _requested_static_archive_bottom) {
398 // Size overflow.
399 log_error(cds)("my_archive_requested_bottom = " INTPTR_FORMAT, p2i(my_archive_requested_bottom));
400 log_error(cds)("my_archive_requested_top = " INTPTR_FORMAT, p2i(my_archive_requested_top));
401 log_error(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is too high. "
402 "Please rerun java -Xshare:dump with a lower value", p2i(_requested_static_archive_bottom));
403 MetaspaceShared::unrecoverable_writing_error();
404 }
405
406 if (CDSConfig::is_dumping_static_archive()) {
407 // We don't want any valid object to be at the very bottom of the archive.
408 // See ArchivePtrMarker::mark_pointer().
409 rw_region()->allocate(16);
410 }
411
412 return buffer_bottom;
413 }
414
415 void ArchiveBuilder::iterate_sorted_roots(MetaspaceClosure* it) {
416 int num_symbols = _symbols->length();
417 for (int i = 0; i < num_symbols; i++) {
418 it->push(_symbols->adr_at(i));
419 }
420
421 int num_klasses = _klasses->length();
422 for (int i = 0; i < num_klasses; i++) {
423 it->push(_klasses->adr_at(i));
424 }
425
426 iterate_roots(it);
427 }
428
429 class GatherSortedSourceObjs : public MetaspaceClosure {
430 ArchiveBuilder* _builder;
431
432 public:
433 GatherSortedSourceObjs(ArchiveBuilder* builder) : _builder(builder) {}
434
435 virtual bool do_ref(Ref* ref, bool read_only) {
436 return _builder->gather_one_source_obj(ref, read_only);
437 }
438 };
439
440 bool ArchiveBuilder::gather_one_source_obj(MetaspaceClosure::Ref* ref, bool read_only) {
441 address src_obj = ref->obj();
442 if (src_obj == nullptr) {
443 return false;
444 }
445
446 remember_embedded_pointer_in_enclosing_obj(ref);
447 if (RegeneratedClasses::has_been_regenerated(src_obj)) {
448 // No need to copy it. We will later relocate it to point to the regenerated klass/method.
449 return false;
450 }
451
452 FollowMode follow_mode = get_follow_mode(ref);
453 SourceObjInfo src_info(ref, read_only, follow_mode);
454 bool created;
455 SourceObjInfo* p = _src_obj_table.put_if_absent(src_obj, src_info, &created);
456 if (created) {
457 if (_src_obj_table.maybe_grow()) {
458 log_info(cds, hashtables)("Expanded _src_obj_table table to %d", _src_obj_table.table_size());
459 }
460 }
461
462 #ifdef ASSERT
463 if (ref->msotype() == MetaspaceObj::MethodType) {
464 Method* m = (Method*)ref->obj();
465 assert(!RegeneratedClasses::has_been_regenerated((address)m->method_holder()),
466 "Should not archive methods in a class that has been regenerated");
467 }
468 #endif
469
470 assert(p->read_only() == src_info.read_only(), "must be");
471
472 if (created && src_info.should_copy()) {
473 if (read_only) {
474 _ro_src_objs.append(p);
475 } else {
476 _rw_src_objs.append(p);
477 }
478 return true; // Need to recurse into this ref only if we are copying it
479 } else {
480 return false;
481 }
482 }
483
484 void ArchiveBuilder::record_regenerated_object(address orig_src_obj, address regen_src_obj) {
485 // Record the fact that orig_src_obj has been replaced by regen_src_obj. All calls to get_buffered_addr(orig_src_obj)
486 // should return the same value as get_buffered_addr(regen_src_obj).
487 SourceObjInfo* p = _src_obj_table.get(regen_src_obj);
488 assert(p != nullptr, "regenerated object should always be dumped");
489 SourceObjInfo orig_src_info(orig_src_obj, p);
490 bool created;
491 _src_obj_table.put_if_absent(orig_src_obj, orig_src_info, &created);
492 assert(created, "We shouldn't have archived the original copy of a regenerated object");
493 }
494
495 // Remember that we have a pointer inside ref->enclosing_obj() that points to ref->obj()
496 void ArchiveBuilder::remember_embedded_pointer_in_enclosing_obj(MetaspaceClosure::Ref* ref) {
497 assert(ref->obj() != nullptr, "should have checked");
498
499 address enclosing_obj = ref->enclosing_obj();
500 if (enclosing_obj == nullptr) {
501 return;
502 }
503
504 // We are dealing with 3 addresses:
505 // address o = ref->obj(): We have found an object whose address is o.
506 // address* mpp = ref->mpp(): The object o is pointed to by a pointer whose address is mpp.
507 // I.e., (*mpp == o)
508 // enclosing_obj : If non-null, it is the object which has a field that points to o.
509 // mpp is the address if that field.
510 //
511 // Example: We have an array whose first element points to a Method:
512 // Method* o = 0x0000abcd;
513 // Array<Method*>* enclosing_obj = 0x00001000;
514 // enclosing_obj->at_put(0, o);
515 //
516 // We the MetaspaceClosure iterates on the very first element of this array, we have
517 // ref->obj() == 0x0000abcd (the Method)
518 // ref->mpp() == 0x00001008 (the location of the first element in the array)
519 // ref->enclosing_obj() == 0x00001000 (the Array that contains the Method)
520 //
521 // We use the above information to mark the bitmap to indicate that there's a pointer on address 0x00001008.
522 SourceObjInfo* src_info = _src_obj_table.get(enclosing_obj);
523 if (src_info == nullptr || !src_info->should_copy()) {
524 // source objects of point_to_it/set_to_null types are not copied
525 // so we don't need to remember their pointers.
526 } else {
527 if (src_info->read_only()) {
528 _ro_src_objs.remember_embedded_pointer(src_info, ref);
529 } else {
530 _rw_src_objs.remember_embedded_pointer(src_info, ref);
531 }
532 }
533 }
534
535 void ArchiveBuilder::gather_source_objs() {
536 ResourceMark rm;
537 log_info(cds)("Gathering all archivable objects ... ");
538 gather_klasses_and_symbols();
539 GatherSortedSourceObjs doit(this);
540 iterate_sorted_roots(&doit);
541 doit.finish();
542 }
543
544 bool ArchiveBuilder::is_excluded(Klass* klass) {
545 if (klass->is_instance_klass()) {
546 InstanceKlass* ik = InstanceKlass::cast(klass);
547 return SystemDictionaryShared::is_excluded_class(ik);
548 } else if (klass->is_objArray_klass()) {
549 Klass* bottom = ObjArrayKlass::cast(klass)->bottom_klass();
550 if (MetaspaceShared::is_shared_static(bottom)) {
551 // The bottom class is in the static archive so it's clearly not excluded.
552 assert(CDSConfig::is_dumping_dynamic_archive(), "sanity");
553 return false;
554 } else if (bottom->is_instance_klass()) {
555 return SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(bottom));
556 }
557 }
558
559 return false;
560 }
561
562 ArchiveBuilder::FollowMode ArchiveBuilder::get_follow_mode(MetaspaceClosure::Ref *ref) {
563 address obj = ref->obj();
564 if (MetaspaceShared::is_in_shared_metaspace(obj)) {
565 // Don't dump existing shared metadata again.
566 return point_to_it;
567 } else if (ref->msotype() == MetaspaceObj::MethodDataType ||
568 ref->msotype() == MetaspaceObj::MethodCountersType) {
569 return set_to_null;
570 } else {
571 if (ref->msotype() == MetaspaceObj::ClassType) {
572 Klass* klass = (Klass*)ref->obj();
573 assert(klass->is_klass(), "must be");
574 if (is_excluded(klass)) {
575 ResourceMark rm;
576 log_debug(cds, dynamic)("Skipping class (excluded): %s", klass->external_name());
577 return set_to_null;
578 }
579 }
580
581 return make_a_copy;
582 }
583 }
584
585 void ArchiveBuilder::start_dump_region(DumpRegion* next) {
586 address bottom = _last_verified_top;
587 address top = (address)(current_dump_region()->top());
588 _other_region_used_bytes += size_t(top - bottom);
589
590 current_dump_region()->pack(next);
591 _current_dump_region = next;
592 _num_dump_regions_used ++;
593
594 _last_verified_top = (address)(current_dump_region()->top());
595 }
596
597 void ArchiveBuilder::verify_estimate_size(size_t estimate, const char* which) {
598 address bottom = _last_verified_top;
599 address top = (address)(current_dump_region()->top());
600 size_t used = size_t(top - bottom) + _other_region_used_bytes;
601 int diff = int(estimate) - int(used);
602
603 log_info(cds)("%s estimate = " SIZE_FORMAT " used = " SIZE_FORMAT "; diff = %d bytes", which, estimate, used, diff);
604 assert(diff >= 0, "Estimate is too small");
605
606 _last_verified_top = top;
607 _other_region_used_bytes = 0;
608 }
609
610 char* ArchiveBuilder::ro_strdup(const char* s) {
611 char* archived_str = ro_region_alloc((int)strlen(s) + 1);
612 strcpy(archived_str, s);
613 return archived_str;
614 }
615
616 // The objects that have embedded pointers will sink
617 // towards the end of the list. This ensures we have a maximum
618 // number of leading zero bits in the relocation bitmap.
619 int ArchiveBuilder::compare_src_objs(SourceObjInfo** a, SourceObjInfo** b) {
620 if ((*a)->has_embedded_pointer() && !(*b)->has_embedded_pointer()) {
621 return 1;
622 } else if (!(*a)->has_embedded_pointer() && (*b)->has_embedded_pointer()) {
623 return -1;
624 } else {
625 // This is necessary to keep the sorting order stable. Otherwise the
626 // archive's contents may not be deterministic.
627 return (*a)->id() - (*b)->id();
628 }
629 }
630
631 void ArchiveBuilder::sort_metadata_objs() {
632 _rw_src_objs.objs()->sort(compare_src_objs);
633 _ro_src_objs.objs()->sort(compare_src_objs);
634 }
635
636 void ArchiveBuilder::dump_rw_metadata() {
637 ResourceMark rm;
638 log_info(cds)("Allocating RW objects ... ");
639 make_shallow_copies(&_rw_region, &_rw_src_objs);
640
641 #if INCLUDE_CDS_JAVA_HEAP
642 if (CDSConfig::is_dumping_full_module_graph()) {
643 // Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
644 char* start = rw_region()->top();
645 ClassLoaderDataShared::allocate_archived_tables();
646 alloc_stats()->record_modules(rw_region()->top() - start, /*read_only*/false);
647 }
648 #endif
649 }
650
651 void ArchiveBuilder::dump_ro_metadata() {
652 ResourceMark rm;
653 log_info(cds)("Allocating RO objects ... ");
654
655 start_dump_region(&_ro_region);
656 make_shallow_copies(&_ro_region, &_ro_src_objs);
657
658 #if INCLUDE_CDS_JAVA_HEAP
659 if (CDSConfig::is_dumping_full_module_graph()) {
660 char* start = ro_region()->top();
661 ClassLoaderDataShared::init_archived_tables();
662 alloc_stats()->record_modules(ro_region()->top() - start, /*read_only*/true);
663 }
664 #endif
665
666 RegeneratedClasses::record_regenerated_objects();
667 }
668
669 void ArchiveBuilder::make_shallow_copies(DumpRegion *dump_region,
670 const ArchiveBuilder::SourceObjList* src_objs) {
671 for (int i = 0; i < src_objs->objs()->length(); i++) {
672 make_shallow_copy(dump_region, src_objs->objs()->at(i));
673 }
674 log_info(cds)("done (%d objects)", src_objs->objs()->length());
675 }
676
677 void ArchiveBuilder::make_shallow_copy(DumpRegion *dump_region, SourceObjInfo* src_info) {
678 address src = src_info->source_addr();
679 int bytes = src_info->size_in_bytes();
680 char* dest;
681 char* oldtop;
682 char* newtop;
683
684 oldtop = dump_region->top();
685 if (src_info->msotype() == MetaspaceObj::ClassType) {
686 // Allocate space for a pointer directly in front of the future InstanceKlass, so
687 // we can do a quick lookup from InstanceKlass* -> RunTimeClassInfo*
688 // without building another hashtable. See RunTimeClassInfo::get_for()
689 // in systemDictionaryShared.cpp.
690 Klass* klass = (Klass*)src;
691 if (klass->is_instance_klass()) {
692 SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
693 dump_region->allocate(sizeof(address));
694 }
695 // Allocate space for the future InstanceKlass with proper alignment
696 const size_t alignment =
697 #ifdef _LP64
698 UseCompressedClassPointers ?
699 nth_bit(ArchiveBuilder::precomputed_narrow_klass_shift()) :
700 SharedSpaceObjectAlignment;
701 #else
702 SharedSpaceObjectAlignment;
703 #endif
704 dest = dump_region->allocate(bytes, alignment);
705 } else {
706 dest = dump_region->allocate(bytes);
707 }
708 newtop = dump_region->top();
709
710 memcpy(dest, src, bytes);
711
712 // Update the hash of buffered sorted symbols for static dump so that the symbols have deterministic contents
713 if (CDSConfig::is_dumping_static_archive() && (src_info->msotype() == MetaspaceObj::SymbolType)) {
714 Symbol* buffered_symbol = (Symbol*)dest;
715 assert(((Symbol*)src)->is_permanent(), "archived symbols must be permanent");
716 buffered_symbol->update_identity_hash();
717 }
718
719 {
720 bool created;
721 _buffered_to_src_table.put_if_absent((address)dest, src, &created);
722 assert(created, "must be");
723 if (_buffered_to_src_table.maybe_grow()) {
724 log_info(cds, hashtables)("Expanded _buffered_to_src_table table to %d", _buffered_to_src_table.table_size());
725 }
726 }
727
728 intptr_t* archived_vtable = CppVtables::get_archived_vtable(src_info->msotype(), (address)dest);
729 if (archived_vtable != nullptr) {
730 *(address*)dest = (address)archived_vtable;
731 ArchivePtrMarker::mark_pointer((address*)dest);
732 }
733
734 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(src), p2i(dest), bytes);
735 src_info->set_buffered_addr((address)dest);
736
737 _alloc_stats.record(src_info->msotype(), int(newtop - oldtop), src_info->read_only());
738
739 DEBUG_ONLY(_alloc_stats.verify((int)dump_region->used(), src_info->read_only()));
740 }
741
742 // This is used by code that hand-assembles data structures, such as the LambdaProxyClassKey, that are
743 // not handled by MetaspaceClosure.
744 void ArchiveBuilder::write_pointer_in_buffer(address* ptr_location, address src_addr) {
745 assert(is_in_buffer_space(ptr_location), "must be");
746 if (src_addr == nullptr) {
747 *ptr_location = nullptr;
748 ArchivePtrMarker::clear_pointer(ptr_location);
749 } else {
750 *ptr_location = get_buffered_addr(src_addr);
751 ArchivePtrMarker::mark_pointer(ptr_location);
752 }
753 }
754
755 void ArchiveBuilder::mark_and_relocate_to_buffered_addr(address* ptr_location) {
756 assert(*ptr_location != nullptr, "sanity");
757 if (!is_in_mapped_static_archive(*ptr_location)) {
758 *ptr_location = get_buffered_addr(*ptr_location);
759 }
760 ArchivePtrMarker::mark_pointer(ptr_location);
761 }
762
763 bool ArchiveBuilder::has_been_buffered(address src_addr) const {
764 if (RegeneratedClasses::has_been_regenerated(src_addr) ||
765 _src_obj_table.get(src_addr) == nullptr ||
766 get_buffered_addr(src_addr) == nullptr) {
767 return false;
768 } else {
769 return true;
770 }
771 }
772
773 address ArchiveBuilder::get_buffered_addr(address src_addr) const {
774 SourceObjInfo* p = _src_obj_table.get(src_addr);
775 assert(p != nullptr, "src_addr " INTPTR_FORMAT " is used but has not been archived",
776 p2i(src_addr));
777
778 return p->buffered_addr();
779 }
780
781 address ArchiveBuilder::get_source_addr(address buffered_addr) const {
782 assert(is_in_buffer_space(buffered_addr), "must be");
783 address* src_p = _buffered_to_src_table.get(buffered_addr);
784 assert(src_p != nullptr && *src_p != nullptr, "must be");
785 return *src_p;
786 }
787
788 void ArchiveBuilder::relocate_embedded_pointers(ArchiveBuilder::SourceObjList* src_objs) {
789 for (int i = 0; i < src_objs->objs()->length(); i++) {
790 src_objs->relocate(i, this);
791 }
792 }
793
794 void ArchiveBuilder::relocate_metaspaceobj_embedded_pointers() {
795 log_info(cds)("Relocating embedded pointers in core regions ... ");
796 relocate_embedded_pointers(&_rw_src_objs);
797 relocate_embedded_pointers(&_ro_src_objs);
798 }
799
800 #define ADD_COUNT(x) \
801 x += 1; \
802 x ## _a += aotlinked ? 1 : 0; \
803 x ## _i += inited ? 1 : 0;
804
805 #define DECLARE_INSTANCE_KLASS_COUNTER(x) \
806 int x = 0; \
807 int x ## _a = 0; \
808 int x ## _i = 0;
809
810 void ArchiveBuilder::make_klasses_shareable() {
811 DECLARE_INSTANCE_KLASS_COUNTER(num_instance_klasses);
812 DECLARE_INSTANCE_KLASS_COUNTER(num_boot_klasses);
813 DECLARE_INSTANCE_KLASS_COUNTER(num_vm_klasses);
814 DECLARE_INSTANCE_KLASS_COUNTER(num_platform_klasses);
815 DECLARE_INSTANCE_KLASS_COUNTER(num_app_klasses);
816 DECLARE_INSTANCE_KLASS_COUNTER(num_old_klasses);
817 DECLARE_INSTANCE_KLASS_COUNTER(num_hidden_klasses);
818 DECLARE_INSTANCE_KLASS_COUNTER(num_enum_klasses);
819 DECLARE_INSTANCE_KLASS_COUNTER(num_unregistered_klasses);
820 int num_unlinked_klasses = 0;
821 int num_obj_array_klasses = 0;
822 int num_type_array_klasses = 0;
823
824 int boot_unlinked = 0;
825 int platform_unlinked = 0;
826 int app_unlinked = 0;
827 int unreg_unlinked = 0;
828
829 for (int i = 0; i < klasses()->length(); i++) {
830 // Some of the code in ConstantPool::remove_unshareable_info() requires the classes
831 // to be in linked state, so it must be call here before the next loop, which returns
832 // all classes to unlinked state.
833 Klass* k = get_buffered_addr(klasses()->at(i));
834 if (k->is_instance_klass()) {
835 InstanceKlass::cast(k)->constants()->remove_unshareable_info();
836 }
837 }
838
839 for (int i = 0; i < klasses()->length(); i++) {
840 const char* type;
841 const char* unlinked = "";
842 const char* kind = "";
843 const char* hidden = "";
844 const char* old = "";
845 const char* generated = "";
846 const char* aotlinked_msg = "";
847 const char* inited_msg = "";
848 Klass* k = get_buffered_addr(klasses()->at(i));
849 k->remove_java_mirror();
850 #ifdef _LP64
851 if (UseCompactObjectHeaders) {
852 Klass* requested_k = to_requested(k);
853 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
854 const int narrow_klass_shift = precomputed_narrow_klass_shift();
855 narrowKlass nk = CompressedKlassPointers::encode_not_null_without_asserts(requested_k, narrow_klass_base, narrow_klass_shift);
856 k->set_prototype_header(markWord::prototype().set_narrow_klass(nk));
857 }
858 #endif //_LP64
859 if (k->is_objArray_klass()) {
860 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
861 // on their array classes.
862 num_obj_array_klasses ++;
863 type = "array";
864 } else if (k->is_typeArray_klass()) {
865 num_type_array_klasses ++;
866 type = "array";
867 k->remove_unshareable_info();
868 } else {
869 assert(k->is_instance_klass(), " must be");
870 InstanceKlass* ik = InstanceKlass::cast(k);
871 InstanceKlass* src_ik = get_source_addr(ik);
872 bool aotlinked = AOTClassLinker::is_candidate(src_ik);
873 bool inited = ik->has_aot_initialized_mirror();
874 ADD_COUNT(num_instance_klasses);
875 if (CDSConfig::is_dumping_dynamic_archive()) {
876 // For static dump, class loader type are already set.
877 ik->assign_class_loader_type();
878 }
879 if (ik->is_hidden()) {
880 ADD_COUNT(num_hidden_klasses);
881 hidden = " hidden";
882 oop loader = k->class_loader();
883 if (loader == nullptr) {
884 type = "boot";
885 ADD_COUNT(num_boot_klasses);
886 } else if (loader == SystemDictionary::java_platform_loader()) {
887 type = "plat";
888 ADD_COUNT(num_platform_klasses);
889 } else if (loader == SystemDictionary::java_system_loader()) {
890 type = "app";
891 ADD_COUNT(num_app_klasses);
892 } else {
893 type = "bad";
894 assert(0, "shouldn't happen");
895 }
896 if (CDSConfig::is_dumping_invokedynamic()) {
897 assert(HeapShared::is_archivable_hidden_klass(ik), "sanity");
898 } else {
899 // Legacy CDS support for lambda proxies
900 assert(HeapShared::is_lambda_proxy_klass(ik), "sanity");
901 }
902 } else if (ik->is_shared_boot_class()) {
903 type = "boot";
904 ADD_COUNT(num_boot_klasses);
905 } else if (ik->is_shared_platform_class()) {
906 type = "plat";
907 ADD_COUNT(num_platform_klasses);
908 } else if (ik->is_shared_app_class()) {
909 type = "app";
910 ADD_COUNT(num_app_klasses);
911 } else {
912 assert(ik->is_shared_unregistered_class(), "must be");
913 type = "unreg";
914 ADD_COUNT(num_unregistered_klasses);
915 }
916
917 if (AOTClassLinker::is_vm_class(src_ik)) {
918 ADD_COUNT(num_vm_klasses);
919 }
920
921 if (!ik->is_linked()) {
922 num_unlinked_klasses ++;
923 unlinked = " unlinked";
924 if (ik->is_shared_boot_class()) {
925 boot_unlinked ++;
926 } else if (ik->is_shared_platform_class()) {
927 platform_unlinked ++;
928 } else if (ik->is_shared_app_class()) {
929 app_unlinked ++;
930 } else {
931 unreg_unlinked ++;
932 }
933 }
934
935 if (ik->is_interface()) {
936 kind = " interface";
937 } else if (src_ik->is_enum_subclass()) {
938 kind = " enum";
939 ADD_COUNT(num_enum_klasses);
940 }
941
942 if (!ik->can_be_verified_at_dumptime()) {
943 ADD_COUNT(num_old_klasses);
944 old = " old";
945 }
946
947 if (ik->is_generated_shared_class()) {
948 generated = " generated";
949 }
950 if (aotlinked) {
951 aotlinked_msg = " aot-linked";
952 }
953 if (inited) {
954 inited_msg = " inited";
955 }
956
957 MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread::current(), ik);
958 ik->remove_unshareable_info();
959 }
960
961 if (log_is_enabled(Debug, cds, class)) {
962 ResourceMark rm;
963 log_debug(cds, class)("klasses[%5d] = " PTR_FORMAT " %-5s %s%s%s%s%s%s%s%s", i,
964 p2i(to_requested(k)), type, k->external_name(),
965 kind, hidden, old, unlinked, generated, aotlinked_msg, inited_msg);
966 }
967 }
968
969 #define STATS_FORMAT "= %5d, aot-linked = %5d, inited = %5d"
970 #define STATS_PARAMS(x) num_ ## x, num_ ## x ## _a, num_ ## x ## _i
971
972 log_info(cds)("Number of classes %d", num_instance_klasses + num_obj_array_klasses + num_type_array_klasses);
973 log_info(cds)(" instance classes " STATS_FORMAT, STATS_PARAMS(instance_klasses));
974 log_info(cds)(" boot " STATS_FORMAT, STATS_PARAMS(boot_klasses));
975 log_info(cds)(" vm " STATS_FORMAT, STATS_PARAMS(vm_klasses));
976 log_info(cds)(" platform " STATS_FORMAT, STATS_PARAMS(platform_klasses));
977 log_info(cds)(" app " STATS_FORMAT, STATS_PARAMS(app_klasses));
978 log_info(cds)(" unregistered " STATS_FORMAT, STATS_PARAMS(unregistered_klasses));
979 log_info(cds)(" (enum) " STATS_FORMAT, STATS_PARAMS(enum_klasses));
980 log_info(cds)(" (hidden) " STATS_FORMAT, STATS_PARAMS(hidden_klasses));
981 log_info(cds)(" (old) " STATS_FORMAT, STATS_PARAMS(old_klasses));
982 log_info(cds)(" (unlinked) = %5d, boot = %d, plat = %d, app = %d, unreg = %d",
983 num_unlinked_klasses, boot_unlinked, platform_unlinked, app_unlinked, unreg_unlinked);
984 log_info(cds)(" obj array classes = %5d", num_obj_array_klasses);
985 log_info(cds)(" type array classes = %5d", num_type_array_klasses);
986 log_info(cds)(" symbols = %5d", _symbols->length());
987
988 #undef STATS_FORMAT
989 #undef STATS_PARAMS
990
991 DynamicArchive::make_array_klasses_shareable();
992 }
993
994 void ArchiveBuilder::serialize_dynamic_archivable_items(SerializeClosure* soc) {
995 SymbolTable::serialize_shared_table_header(soc, false);
996 SystemDictionaryShared::serialize_dictionary_headers(soc, false);
997 DynamicArchive::serialize_array_klasses(soc);
998 AOTLinkedClassBulkLoader::serialize(soc, false);
999 }
1000
1001 uintx ArchiveBuilder::buffer_to_offset(address p) const {
1002 address requested_p = to_requested(p);
1003 assert(requested_p >= _requested_static_archive_bottom, "must be");
1004 return requested_p - _requested_static_archive_bottom;
1005 }
1006
1007 uintx ArchiveBuilder::any_to_offset(address p) const {
1008 if (is_in_mapped_static_archive(p)) {
1009 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1010 return p - _mapped_static_archive_bottom;
1011 }
1012 if (!is_in_buffer_space(p)) {
1013 // p must be a "source" address
1014 p = get_buffered_addr(p);
1015 }
1016 return buffer_to_offset(p);
1017 }
1018
1019 address ArchiveBuilder::offset_to_buffered_address(u4 offset) const {
1020 address requested_addr = _requested_static_archive_bottom + offset;
1021 address buffered_addr = requested_addr - _buffer_to_requested_delta;
1022 assert(is_in_buffer_space(buffered_addr), "bad offset");
1023 return buffered_addr;
1024 }
1025
1026 #if INCLUDE_CDS_JAVA_HEAP
1027 narrowKlass ArchiveBuilder::get_requested_narrow_klass(Klass* k) {
1028 assert(CDSConfig::is_dumping_heap(), "sanity");
1029 k = get_buffered_klass(k);
1030 Klass* requested_k = to_requested(k);
1031 const int narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
1032 #ifdef ASSERT
1033 const size_t klass_alignment = MAX2(SharedSpaceObjectAlignment, (size_t)nth_bit(narrow_klass_shift));
1034 assert(is_aligned(k, klass_alignment), "Klass " PTR_FORMAT " misaligned.", p2i(k));
1035 #endif
1036 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
1037 // Note: use the "raw" version of encode that takes explicit narrow klass base and shift. Don't use any
1038 // of the variants that do sanity checks, nor any of those that use the current - dump - JVM's encoding setting.
1039 return CompressedKlassPointers::encode_not_null_without_asserts(requested_k, narrow_klass_base, narrow_klass_shift);
1040 }
1041 #endif // INCLUDE_CDS_JAVA_HEAP
1042
1043 // RelocateBufferToRequested --- Relocate all the pointers in rw/ro,
1044 // so that the archive can be mapped to the "requested" location without runtime relocation.
1045 //
1046 // - See ArchiveBuilder header for the definition of "buffer", "mapped" and "requested"
1047 // - ArchivePtrMarker::ptrmap() marks all the pointers in the rw/ro regions
1048 // - Every pointer must have one of the following values:
1049 // [a] nullptr:
1050 // No relocation is needed. Remove this pointer from ptrmap so we don't need to
1051 // consider it at runtime.
1052 // [b] Points into an object X which is inside the buffer:
1053 // Adjust this pointer by _buffer_to_requested_delta, so it points to X
1054 // when the archive is mapped at the requested location.
1055 // [c] Points into an object Y which is inside mapped static archive:
1056 // - This happens only during dynamic dump
1057 // - Adjust this pointer by _mapped_to_requested_static_archive_delta,
1058 // so it points to Y when the static archive is mapped at the requested location.
1059 template <bool STATIC_DUMP>
1060 class RelocateBufferToRequested : public BitMapClosure {
1061 ArchiveBuilder* _builder;
1062 address _buffer_bottom;
1063 intx _buffer_to_requested_delta;
1064 intx _mapped_to_requested_static_archive_delta;
1065 size_t _max_non_null_offset;
1066
1067 public:
1068 RelocateBufferToRequested(ArchiveBuilder* builder) {
1069 _builder = builder;
1070 _buffer_bottom = _builder->buffer_bottom();
1071 _buffer_to_requested_delta = builder->buffer_to_requested_delta();
1072 _mapped_to_requested_static_archive_delta = builder->requested_static_archive_bottom() - builder->mapped_static_archive_bottom();
1073 _max_non_null_offset = 0;
1074
1075 address bottom = _builder->buffer_bottom();
1076 address top = _builder->buffer_top();
1077 address new_bottom = bottom + _buffer_to_requested_delta;
1078 address new_top = top + _buffer_to_requested_delta;
1079 log_debug(cds)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT "] to "
1080 "[" INTPTR_FORMAT " - " INTPTR_FORMAT "]",
1081 p2i(bottom), p2i(top),
1082 p2i(new_bottom), p2i(new_top));
1083 }
1084
1085 bool do_bit(size_t offset) {
1086 address* p = (address*)_buffer_bottom + offset;
1087 assert(_builder->is_in_buffer_space(p), "pointer must live in buffer space");
1088
1089 if (*p == nullptr) {
1090 // todo -- clear bit, etc
1091 ArchivePtrMarker::ptrmap()->clear_bit(offset);
1092 } else {
1093 if (STATIC_DUMP) {
1094 assert(_builder->is_in_buffer_space(*p), "old pointer must point inside buffer space");
1095 *p += _buffer_to_requested_delta;
1096 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1097 } else {
1098 if (_builder->is_in_buffer_space(*p)) {
1099 *p += _buffer_to_requested_delta;
1100 // assert is in requested dynamic archive
1101 } else {
1102 assert(_builder->is_in_mapped_static_archive(*p), "old pointer must point inside buffer space or mapped static archive");
1103 *p += _mapped_to_requested_static_archive_delta;
1104 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1105 }
1106 }
1107 _max_non_null_offset = offset;
1108 }
1109
1110 return true; // keep iterating
1111 }
1112
1113 void doit() {
1114 ArchivePtrMarker::ptrmap()->iterate(this);
1115 ArchivePtrMarker::compact(_max_non_null_offset);
1116 }
1117 };
1118
1119 #ifdef _LP64
1120 int ArchiveBuilder::precomputed_narrow_klass_shift() {
1121 // Legacy Mode:
1122 // We use 32 bits for narrowKlass, which should cover the full 4G Klass range. Shift can be 0.
1123 // CompactObjectHeader Mode:
1124 // narrowKlass is much smaller, and we use the highest possible shift value to later get the maximum
1125 // Klass encoding range.
1126 //
1127 // Note that all of this may change in the future, if we decide to correct the pre-calculated
1128 // narrow Klass IDs at archive load time.
1129 assert(UseCompressedClassPointers, "Only needed for compressed class pointers");
1130 return UseCompactObjectHeaders ? CompressedKlassPointers::max_shift() : 0;
1131 }
1132 #endif // _LP64
1133
1134 void ArchiveBuilder::relocate_to_requested() {
1135 ro_region()->pack();
1136
1137 size_t my_archive_size = buffer_top() - buffer_bottom();
1138
1139 if (CDSConfig::is_dumping_static_archive()) {
1140 _requested_static_archive_top = _requested_static_archive_bottom + my_archive_size;
1141 RelocateBufferToRequested<true> patcher(this);
1142 patcher.doit();
1143 } else {
1144 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1145 _requested_dynamic_archive_top = _requested_dynamic_archive_bottom + my_archive_size;
1146 RelocateBufferToRequested<false> patcher(this);
1147 patcher.doit();
1148 }
1149 }
1150
1151 // Write detailed info to a mapfile to analyze contents of the archive.
1152 // static dump:
1153 // java -Xshare:dump -Xlog:cds+map=trace:file=cds.map:none:filesize=0
1154 // dynamic dump:
1155 // java -cp MyApp.jar -XX:ArchiveClassesAtExit=MyApp.jsa \
1156 // -Xlog:cds+map=trace:file=cds.map:none:filesize=0 MyApp
1157 //
1158 // We need to do some address translation because the buffers used at dump time may be mapped to
1159 // a different location at runtime. At dump time, the buffers may be at arbitrary locations
1160 // picked by the OS. At runtime, we try to map at a fixed location (SharedBaseAddress). For
1161 // consistency, we log everything using runtime addresses.
1162 class ArchiveBuilder::CDSMapLogger : AllStatic {
1163 static intx buffer_to_runtime_delta() {
1164 // Translate the buffers used by the RW/RO regions to their eventual (requested) locations
1165 // at runtime.
1166 return ArchiveBuilder::current()->buffer_to_requested_delta();
1167 }
1168
1169 // rw/ro regions only
1170 static void log_metaspace_region(const char* name, DumpRegion* region,
1171 const ArchiveBuilder::SourceObjList* src_objs) {
1172 address region_base = address(region->base());
1173 address region_top = address(region->top());
1174 log_region(name, region_base, region_top, region_base + buffer_to_runtime_delta());
1175 log_metaspace_objects(region, src_objs);
1176 }
1177
1178 #define _LOG_PREFIX PTR_FORMAT ": @@ %-17s %d"
1179
1180 static void log_klass(Klass* k, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1181 ResourceMark rm(current);
1182 log_debug(cds, map)(_LOG_PREFIX " %s",
1183 p2i(runtime_dest), type_name, bytes, k->external_name());
1184 }
1185 static void log_method(Method* m, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1186 ResourceMark rm(current);
1187 log_debug(cds, map)(_LOG_PREFIX " %s",
1188 p2i(runtime_dest), type_name, bytes, m->external_name());
1189 }
1190
1191 // rw/ro regions only
1192 static void log_metaspace_objects(DumpRegion* region, const ArchiveBuilder::SourceObjList* src_objs) {
1193 address last_obj_base = address(region->base());
1194 address last_obj_end = address(region->base());
1195 address region_end = address(region->end());
1196 Thread* current = Thread::current();
1197 for (int i = 0; i < src_objs->objs()->length(); i++) {
1198 SourceObjInfo* src_info = src_objs->at(i);
1199 address src = src_info->source_addr();
1200 address dest = src_info->buffered_addr();
1201 log_as_hex(last_obj_base, dest, last_obj_base + buffer_to_runtime_delta());
1202 address runtime_dest = dest + buffer_to_runtime_delta();
1203 int bytes = src_info->size_in_bytes();
1204
1205 MetaspaceObj::Type type = src_info->msotype();
1206 const char* type_name = MetaspaceObj::type_name(type);
1207
1208 switch (type) {
1209 case MetaspaceObj::ClassType:
1210 log_klass((Klass*)src, runtime_dest, type_name, bytes, current);
1211 break;
1212 case MetaspaceObj::ConstantPoolType:
1213 log_klass(((ConstantPool*)src)->pool_holder(),
1214 runtime_dest, type_name, bytes, current);
1215 break;
1216 case MetaspaceObj::ConstantPoolCacheType:
1217 log_klass(((ConstantPoolCache*)src)->constant_pool()->pool_holder(),
1218 runtime_dest, type_name, bytes, current);
1219 break;
1220 case MetaspaceObj::MethodType:
1221 log_method((Method*)src, runtime_dest, type_name, bytes, current);
1222 break;
1223 case MetaspaceObj::ConstMethodType:
1224 log_method(((ConstMethod*)src)->method(), runtime_dest, type_name, bytes, current);
1225 break;
1226 case MetaspaceObj::SymbolType:
1227 {
1228 ResourceMark rm(current);
1229 Symbol* s = (Symbol*)src;
1230 log_debug(cds, map)(_LOG_PREFIX " %s", p2i(runtime_dest), type_name, bytes,
1231 s->as_quoted_ascii());
1232 }
1233 break;
1234 default:
1235 log_debug(cds, map)(_LOG_PREFIX, p2i(runtime_dest), type_name, bytes);
1236 break;
1237 }
1238
1239 last_obj_base = dest;
1240 last_obj_end = dest + bytes;
1241 }
1242
1243 log_as_hex(last_obj_base, last_obj_end, last_obj_base + buffer_to_runtime_delta());
1244 if (last_obj_end < region_end) {
1245 log_debug(cds, map)(PTR_FORMAT ": @@ Misc data " SIZE_FORMAT " bytes",
1246 p2i(last_obj_end + buffer_to_runtime_delta()),
1247 size_t(region_end - last_obj_end));
1248 log_as_hex(last_obj_end, region_end, last_obj_end + buffer_to_runtime_delta());
1249 }
1250 }
1251
1252 #undef _LOG_PREFIX
1253
1254 // Log information about a region, whose address at dump time is [base .. top). At
1255 // runtime, this region will be mapped to requested_base. requested_base is 0 if this
1256 // region will be mapped at os-selected addresses (such as the bitmap region), or will
1257 // be accessed with os::read (the header).
1258 //
1259 // Note: across -Xshare:dump runs, base may be different, but requested_base should
1260 // be the same as the archive contents should be deterministic.
1261 static void log_region(const char* name, address base, address top, address requested_base) {
1262 size_t size = top - base;
1263 base = requested_base;
1264 top = requested_base + size;
1265 log_info(cds, map)("[%-18s " PTR_FORMAT " - " PTR_FORMAT " " SIZE_FORMAT_W(9) " bytes]",
1266 name, p2i(base), p2i(top), size);
1267 }
1268
1269 #if INCLUDE_CDS_JAVA_HEAP
1270 static void log_heap_region(ArchiveHeapInfo* heap_info) {
1271 MemRegion r = heap_info->buffer_region();
1272 address start = address(r.start()); // start of the current oop inside the buffer
1273 address end = address(r.end());
1274 log_region("heap", start, end, ArchiveHeapWriter::buffered_addr_to_requested_addr(start));
1275
1276 LogStreamHandle(Info, cds, map) st;
1277
1278 HeapRootSegments segments = heap_info->heap_root_segments();
1279 assert(segments.base_offset() == 0, "Sanity");
1280
1281 for (size_t seg_idx = 0; seg_idx < segments.count(); seg_idx++) {
1282 address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1283 st.print_cr(PTR_FORMAT ": Heap roots segment [%d]",
1284 p2i(requested_start), segments.size_in_elems(seg_idx));
1285 start += segments.size_in_bytes(seg_idx);
1286 }
1287 log_heap_roots();
1288
1289 while (start < end) {
1290 size_t byte_size;
1291 oop source_oop = ArchiveHeapWriter::buffered_addr_to_source_obj(start);
1292 address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1293 st.print(PTR_FORMAT ": @@ Object ", p2i(requested_start));
1294
1295 if (source_oop != nullptr) {
1296 // This is a regular oop that got archived.
1297 print_oop_with_requested_addr_cr(&st, source_oop, false);
1298 byte_size = source_oop->size() * BytesPerWord;
1299 } else if ((byte_size = ArchiveHeapWriter::get_filler_size_at(start)) > 0) {
1300 // We have a filler oop, which also does not exist in BufferOffsetToSourceObjectTable.
1301 st.print_cr("filler " SIZE_FORMAT " bytes", byte_size);
1302 } else {
1303 ShouldNotReachHere();
1304 }
1305
1306 address oop_end = start + byte_size;
1307 log_as_hex(start, oop_end, requested_start, /*is_heap=*/true);
1308
1309 if (source_oop != nullptr) {
1310 log_oop_details(heap_info, source_oop, /*buffered_addr=*/start);
1311 }
1312 start = oop_end;
1313 }
1314 }
1315
1316 // ArchivedFieldPrinter is used to print the fields of archived objects. We can't
1317 // use _source_obj->print_on(), because we want to print the oop fields
1318 // in _source_obj with their requested addresses using print_oop_with_requested_addr_cr().
1319 class ArchivedFieldPrinter : public FieldClosure {
1320 ArchiveHeapInfo* _heap_info;
1321 outputStream* _st;
1322 oop _source_obj;
1323 address _buffered_addr;
1324 public:
1325 ArchivedFieldPrinter(ArchiveHeapInfo* heap_info, outputStream* st, oop src_obj, address buffered_addr) :
1326 _heap_info(heap_info), _st(st), _source_obj(src_obj), _buffered_addr(buffered_addr) {}
1327
1328 void do_field(fieldDescriptor* fd) {
1329 _st->print(" - ");
1330 BasicType ft = fd->field_type();
1331 switch (ft) {
1332 case T_ARRAY:
1333 case T_OBJECT:
1334 fd->print_on(_st); // print just the name and offset
1335 print_oop_with_requested_addr_cr(_st, _source_obj->obj_field(fd->offset()));
1336 break;
1337 default:
1338 if (ArchiveHeapWriter::is_marked_as_native_pointer(_heap_info, _source_obj, fd->offset())) {
1339 print_as_native_pointer(fd);
1340 } else {
1341 fd->print_on_for(_st, cast_to_oop(_buffered_addr)); // name, offset, value
1342 _st->cr();
1343 }
1344 }
1345 }
1346
1347 void print_as_native_pointer(fieldDescriptor* fd) {
1348 LP64_ONLY(assert(fd->field_type() == T_LONG, "must be"));
1349 NOT_LP64 (assert(fd->field_type() == T_INT, "must be"));
1350
1351 // We have a field that looks like an integer, but it's actually a pointer to a MetaspaceObj.
1352 address source_native_ptr = (address)
1353 LP64_ONLY(_source_obj->long_field(fd->offset()))
1354 NOT_LP64( _source_obj->int_field (fd->offset()));
1355 ArchiveBuilder* builder = ArchiveBuilder::current();
1356
1357 // The value of the native pointer at runtime.
1358 address requested_native_ptr = builder->to_requested(builder->get_buffered_addr(source_native_ptr));
1359
1360 // The address of _source_obj at runtime
1361 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(_source_obj);
1362 // The address of this field in the requested space
1363 assert(requested_obj != nullptr, "Attempting to load field from null oop");
1364 address requested_field_addr = cast_from_oop<address>(requested_obj) + fd->offset();
1365
1366 fd->print_on(_st);
1367 _st->print_cr(PTR_FORMAT " (marked metadata pointer @" PTR_FORMAT " )",
1368 p2i(requested_native_ptr), p2i(requested_field_addr));
1369 }
1370 };
1371
1372 // Print the fields of instanceOops, or the elements of arrayOops
1373 static void log_oop_details(ArchiveHeapInfo* heap_info, oop source_oop, address buffered_addr) {
1374 LogStreamHandle(Trace, cds, map, oops) st;
1375 if (st.is_enabled()) {
1376 Klass* source_klass = source_oop->klass();
1377 ArchiveBuilder* builder = ArchiveBuilder::current();
1378 Klass* requested_klass = builder->to_requested(builder->get_buffered_addr(source_klass));
1379
1380 st.print(" - klass: ");
1381 source_klass->print_value_on(&st);
1382 st.print(" " PTR_FORMAT, p2i(requested_klass));
1383 st.cr();
1384
1385 if (source_oop->is_typeArray()) {
1386 TypeArrayKlass::cast(source_klass)->oop_print_elements_on(typeArrayOop(source_oop), &st);
1387 } else if (source_oop->is_objArray()) {
1388 objArrayOop source_obj_array = objArrayOop(source_oop);
1389 for (int i = 0; i < source_obj_array->length(); i++) {
1390 st.print(" -%4d: ", i);
1391 print_oop_with_requested_addr_cr(&st, source_obj_array->obj_at(i));
1392 }
1393 } else {
1394 st.print_cr(" - fields (" SIZE_FORMAT " words):", source_oop->size());
1395 ArchivedFieldPrinter print_field(heap_info, &st, source_oop, buffered_addr);
1396 InstanceKlass::cast(source_klass)->print_nonstatic_fields(&print_field);
1397 }
1398 }
1399 }
1400
1401 static void log_heap_roots() {
1402 LogStreamHandle(Trace, cds, map, oops) st;
1403 if (st.is_enabled()) {
1404 for (int i = 0; i < HeapShared::pending_roots()->length(); i++) {
1405 st.print("roots[%4d]: ", i);
1406 print_oop_with_requested_addr_cr(&st, HeapShared::pending_roots()->at(i));
1407 }
1408 }
1409 }
1410
1411 // The output looks like this. The first number is the requested address. The second number is
1412 // the narrowOop version of the requested address.
1413 // 0x00000007ffc7e840 (0xfff8fd08) java.lang.Class
1414 // 0x00000007ffc000f8 (0xfff8001f) [B length: 11
1415 static void print_oop_with_requested_addr_cr(outputStream* st, oop source_oop, bool print_addr = true) {
1416 if (source_oop == nullptr) {
1417 st->print_cr("null");
1418 } else {
1419 ResourceMark rm;
1420 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(source_oop);
1421 if (print_addr) {
1422 st->print(PTR_FORMAT " ", p2i(requested_obj));
1423 }
1424 if (UseCompressedOops) {
1425 st->print("(0x%08x) ", CompressedOops::narrow_oop_value(requested_obj));
1426 }
1427 if (source_oop->is_array()) {
1428 int array_len = arrayOop(source_oop)->length();
1429 st->print_cr("%s length: %d", source_oop->klass()->external_name(), array_len);
1430 } else {
1431 st->print_cr("%s", source_oop->klass()->external_name());
1432 }
1433 }
1434 }
1435 #endif // INCLUDE_CDS_JAVA_HEAP
1436
1437 // Log all the data [base...top). Pretend that the base address
1438 // will be mapped to requested_base at run-time.
1439 static void log_as_hex(address base, address top, address requested_base, bool is_heap = false) {
1440 assert(top >= base, "must be");
1441
1442 LogStreamHandle(Trace, cds, map) lsh;
1443 if (lsh.is_enabled()) {
1444 int unitsize = sizeof(address);
1445 if (is_heap && UseCompressedOops) {
1446 // This makes the compressed oop pointers easier to read, but
1447 // longs and doubles will be split into two words.
1448 unitsize = sizeof(narrowOop);
1449 }
1450 os::print_hex_dump(&lsh, base, top, unitsize, /* print_ascii=*/true, /* bytes_per_line=*/32, requested_base);
1451 }
1452 }
1453
1454 static void log_header(FileMapInfo* mapinfo) {
1455 LogStreamHandle(Info, cds, map) lsh;
1456 if (lsh.is_enabled()) {
1457 mapinfo->print(&lsh);
1458 }
1459 }
1460
1461 public:
1462 static void log(ArchiveBuilder* builder, FileMapInfo* mapinfo,
1463 ArchiveHeapInfo* heap_info,
1464 char* bitmap, size_t bitmap_size_in_bytes) {
1465 log_info(cds, map)("%s CDS archive map for %s", CDSConfig::is_dumping_static_archive() ? "Static" : "Dynamic", mapinfo->full_path());
1466
1467 address header = address(mapinfo->header());
1468 address header_end = header + mapinfo->header()->header_size();
1469 log_region("header", header, header_end, nullptr);
1470 log_header(mapinfo);
1471 log_as_hex(header, header_end, nullptr);
1472
1473 DumpRegion* rw_region = &builder->_rw_region;
1474 DumpRegion* ro_region = &builder->_ro_region;
1475
1476 log_metaspace_region("rw region", rw_region, &builder->_rw_src_objs);
1477 log_metaspace_region("ro region", ro_region, &builder->_ro_src_objs);
1478
1479 address bitmap_end = address(bitmap + bitmap_size_in_bytes);
1480 log_region("bitmap", address(bitmap), bitmap_end, nullptr);
1481 log_as_hex((address)bitmap, bitmap_end, nullptr);
1482
1483 #if INCLUDE_CDS_JAVA_HEAP
1484 if (heap_info->is_used()) {
1485 log_heap_region(heap_info);
1486 }
1487 #endif
1488
1489 log_info(cds, map)("[End of CDS archive map]");
1490 }
1491 }; // end ArchiveBuilder::CDSMapLogger
1492
1493 void ArchiveBuilder::print_stats() {
1494 _alloc_stats.print_stats(int(_ro_region.used()), int(_rw_region.used()));
1495 }
1496
1497 void ArchiveBuilder::write_archive(FileMapInfo* mapinfo, ArchiveHeapInfo* heap_info) {
1498 // Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
1499 // MetaspaceShared::n_regions (internal to hotspot).
1500 assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
1501
1502 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1503 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1504
1505 // Split pointer map into read-write and read-only bitmaps
1506 ArchivePtrMarker::initialize_rw_ro_maps(&_rw_ptrmap, &_ro_ptrmap);
1507
1508 size_t bitmap_size_in_bytes;
1509 char* bitmap = mapinfo->write_bitmap_region(ArchivePtrMarker::rw_ptrmap(), ArchivePtrMarker::ro_ptrmap(), heap_info,
1510 bitmap_size_in_bytes);
1511
1512 if (heap_info->is_used()) {
1513 _total_heap_region_size = mapinfo->write_heap_region(heap_info);
1514 }
1515
1516 print_region_stats(mapinfo, heap_info);
1517
1518 mapinfo->set_requested_base((char*)MetaspaceShared::requested_base_address());
1519 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1520 // After this point, we should not write any data into mapinfo->header() since this
1521 // would corrupt its checksum we have calculated before.
1522 mapinfo->write_header();
1523 mapinfo->close();
1524
1525 if (log_is_enabled(Info, cds)) {
1526 print_stats();
1527 }
1528
1529 if (log_is_enabled(Info, cds, map)) {
1530 CDSMapLogger::log(this, mapinfo, heap_info,
1531 bitmap, bitmap_size_in_bytes);
1532 }
1533 CDS_JAVA_HEAP_ONLY(HeapShared::destroy_archived_object_cache());
1534 FREE_C_HEAP_ARRAY(char, bitmap);
1535 }
1536
1537 void ArchiveBuilder::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only, bool allow_exec) {
1538 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1539 }
1540
1541 void ArchiveBuilder::print_region_stats(FileMapInfo *mapinfo, ArchiveHeapInfo* heap_info) {
1542 // Print statistics of all the regions
1543 const size_t bitmap_used = mapinfo->region_at(MetaspaceShared::bm)->used();
1544 const size_t bitmap_reserved = mapinfo->region_at(MetaspaceShared::bm)->used_aligned();
1545 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1546 bitmap_reserved +
1547 _total_heap_region_size;
1548 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1549 bitmap_used +
1550 _total_heap_region_size;
1551 const double total_u_perc = percent_of(total_bytes, total_reserved);
1552
1553 _rw_region.print(total_reserved);
1554 _ro_region.print(total_reserved);
1555
1556 print_bitmap_region_stats(bitmap_used, total_reserved);
1557
1558 if (heap_info->is_used()) {
1559 print_heap_region_stats(heap_info, total_reserved);
1560 }
1561
1562 log_debug(cds)("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1563 total_bytes, total_reserved, total_u_perc);
1564 }
1565
1566 void ArchiveBuilder::print_bitmap_region_stats(size_t size, size_t total_size) {
1567 log_debug(cds)("bm space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used]",
1568 size, size/double(total_size)*100.0, size);
1569 }
1570
1571 void ArchiveBuilder::print_heap_region_stats(ArchiveHeapInfo *info, size_t total_size) {
1572 char* start = info->buffer_start();
1573 size_t size = info->buffer_byte_size();
1574 char* top = start + size;
1575 log_debug(cds)("hp space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used] at " INTPTR_FORMAT,
1576 size, size/double(total_size)*100.0, size, p2i(start));
1577 }
1578
1579 void ArchiveBuilder::report_out_of_space(const char* name, size_t needed_bytes) {
1580 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
1581 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
1582 // or so.
1583 _rw_region.print_out_of_space_msg(name, needed_bytes);
1584 _ro_region.print_out_of_space_msg(name, needed_bytes);
1585
1586 log_error(cds)("Unable to allocate from '%s' region: Please reduce the number of shared classes.", name);
1587 MetaspaceShared::unrecoverable_writing_error();
1588 }