1 /*
2 * Copyright (c) 2020, 2025, 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/aotArtifactFinder.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/memoryReserver.hpp"
51 #include "memory/memRegion.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "oops/compressedKlass.inline.hpp"
54 #include "oops/instanceKlass.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oopHandle.inline.hpp"
58 #include "runtime/arguments.hpp"
59 #include "runtime/fieldDescriptor.inline.hpp"
60 #include "runtime/globals_extension.hpp"
61 #include "runtime/javaThread.hpp"
62 #include "runtime/sharedRuntime.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/bitMap.inline.hpp"
65 #include "utilities/formatBuffer.hpp"
66
67 ArchiveBuilder* ArchiveBuilder::_current = nullptr;
68
69 ArchiveBuilder::OtherROAllocMark::~OtherROAllocMark() {
70 char* newtop = ArchiveBuilder::current()->_ro_region.top();
71 ArchiveBuilder::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
72 }
73
74 ArchiveBuilder::SourceObjList::SourceObjList() : _ptrmap(16 * K, mtClassShared) {
75 _total_bytes = 0;
76 _objs = new (mtClassShared) GrowableArray<SourceObjInfo*>(128 * K, mtClassShared);
77 }
78
79 ArchiveBuilder::SourceObjList::~SourceObjList() {
80 delete _objs;
81 }
82
83 void ArchiveBuilder::SourceObjList::append(SourceObjInfo* src_info) {
84 // Save this source object for copying
85 src_info->set_id(_objs->length());
86 _objs->append(src_info);
87
88 // Prepare for marking the pointers in this source object
89 assert(is_aligned(_total_bytes, sizeof(address)), "must be");
90 src_info->set_ptrmap_start(_total_bytes / sizeof(address));
91 _total_bytes = align_up(_total_bytes + (uintx)src_info->size_in_bytes(), sizeof(address));
92 src_info->set_ptrmap_end(_total_bytes / sizeof(address));
93
94 BitMap::idx_t bitmap_size_needed = BitMap::idx_t(src_info->ptrmap_end());
95 if (_ptrmap.size() <= bitmap_size_needed) {
96 _ptrmap.resize((bitmap_size_needed + 1) * 2);
97 }
98 }
99
100 void ArchiveBuilder::SourceObjList::remember_embedded_pointer(SourceObjInfo* src_info, MetaspaceClosure::Ref* ref) {
101 // src_obj contains a pointer. Remember the location of this pointer in _ptrmap,
102 // so that we can copy/relocate it later.
103 src_info->set_has_embedded_pointer();
104 address src_obj = src_info->source_addr();
105 address* field_addr = ref->addr();
106 assert(src_info->ptrmap_start() < _total_bytes, "sanity");
107 assert(src_info->ptrmap_end() <= _total_bytes, "sanity");
108 assert(*field_addr != nullptr, "should have checked");
109
110 intx field_offset_in_bytes = ((address)field_addr) - src_obj;
111 DEBUG_ONLY(int src_obj_size = src_info->size_in_bytes();)
112 assert(field_offset_in_bytes >= 0, "must be");
113 assert(field_offset_in_bytes + intx(sizeof(intptr_t)) <= intx(src_obj_size), "must be");
114 assert(is_aligned(field_offset_in_bytes, sizeof(address)), "must be");
115
116 BitMap::idx_t idx = BitMap::idx_t(src_info->ptrmap_start() + (uintx)(field_offset_in_bytes / sizeof(address)));
117 _ptrmap.set_bit(BitMap::idx_t(idx));
118 }
119
120 class RelocateEmbeddedPointers : public BitMapClosure {
121 ArchiveBuilder* _builder;
122 address _buffered_obj;
123 BitMap::idx_t _start_idx;
124 public:
125 RelocateEmbeddedPointers(ArchiveBuilder* builder, address buffered_obj, BitMap::idx_t start_idx) :
126 _builder(builder), _buffered_obj(buffered_obj), _start_idx(start_idx) {}
127
128 bool do_bit(BitMap::idx_t bit_offset) {
129 size_t field_offset = size_t(bit_offset - _start_idx) * sizeof(address);
130 address* ptr_loc = (address*)(_buffered_obj + field_offset);
131
132 address old_p = *ptr_loc;
133 address new_p = _builder->get_buffered_addr(old_p);
134
135 log_trace(cds)("Ref: [" PTR_FORMAT "] -> " PTR_FORMAT " => " PTR_FORMAT,
136 p2i(ptr_loc), p2i(old_p), p2i(new_p));
137
138 ArchivePtrMarker::set_and_mark_pointer(ptr_loc, new_p);
139 return true; // keep iterating the bitmap
140 }
141 };
142
143 void ArchiveBuilder::SourceObjList::relocate(int i, ArchiveBuilder* builder) {
144 SourceObjInfo* src_info = objs()->at(i);
145 assert(src_info->should_copy(), "must be");
146 BitMap::idx_t start = BitMap::idx_t(src_info->ptrmap_start()); // inclusive
147 BitMap::idx_t end = BitMap::idx_t(src_info->ptrmap_end()); // exclusive
148
149 RelocateEmbeddedPointers relocator(builder, src_info->buffered_addr(), start);
150 _ptrmap.iterate(&relocator, start, end);
151 }
152
153 ArchiveBuilder::ArchiveBuilder() :
154 _current_dump_region(nullptr),
155 _buffer_bottom(nullptr),
156 _num_dump_regions_used(0),
157 _requested_static_archive_bottom(nullptr),
158 _requested_static_archive_top(nullptr),
159 _requested_dynamic_archive_bottom(nullptr),
160 _requested_dynamic_archive_top(nullptr),
161 _mapped_static_archive_bottom(nullptr),
162 _mapped_static_archive_top(nullptr),
163 _buffer_to_requested_delta(0),
164 _rw_region("rw", MAX_SHARED_DELTA),
165 _ro_region("ro", MAX_SHARED_DELTA),
166 _ptrmap(mtClassShared),
167 _rw_ptrmap(mtClassShared),
168 _ro_ptrmap(mtClassShared),
169 _rw_src_objs(),
170 _ro_src_objs(),
171 _src_obj_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
172 _buffered_to_src_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
173 _total_heap_region_size(0)
174 {
175 _klasses = new (mtClassShared) GrowableArray<Klass*>(4 * K, mtClassShared);
176 _symbols = new (mtClassShared) GrowableArray<Symbol*>(256 * K, mtClassShared);
177 _entropy_seed = 0x12345678;
178 assert(_current == nullptr, "must be");
179 _current = this;
180 }
181
182 ArchiveBuilder::~ArchiveBuilder() {
183 assert(_current == this, "must be");
184 _current = nullptr;
185
186 for (int i = 0; i < _symbols->length(); i++) {
187 _symbols->at(i)->decrement_refcount();
188 }
189
190 delete _klasses;
191 delete _symbols;
192 if (_shared_rs.is_reserved()) {
193 MemoryReserver::release(_shared_rs);
194 }
195
196 AOTArtifactFinder::dispose();
197 }
198
199 // Returns a deterministic sequence of pseudo random numbers. The main purpose is NOT
200 // for randomness but to get good entropy for the identity_hash() of archived Symbols,
201 // while keeping the contents of static CDS archives deterministic to ensure
202 // reproducibility of JDK builds.
203 int ArchiveBuilder::entropy() {
204 assert(SafepointSynchronize::is_at_safepoint(), "needed to ensure deterministic sequence");
205 _entropy_seed = os::next_random(_entropy_seed);
206 return static_cast<int>(_entropy_seed);
207 }
208
209 class GatherKlassesAndSymbols : public UniqueMetaspaceClosure {
210 ArchiveBuilder* _builder;
211
212 public:
213 GatherKlassesAndSymbols(ArchiveBuilder* builder) : _builder(builder) {}
214
215 virtual bool do_unique_ref(Ref* ref, bool read_only) {
216 return _builder->gather_klass_and_symbol(ref, read_only);
217 }
218 };
219
220 bool ArchiveBuilder::gather_klass_and_symbol(MetaspaceClosure::Ref* ref, bool read_only) {
221 if (ref->obj() == nullptr) {
222 return false;
223 }
224 if (get_follow_mode(ref) != make_a_copy) {
225 return false;
226 }
227 if (ref->msotype() == MetaspaceObj::ClassType) {
228 Klass* klass = (Klass*)ref->obj();
229 assert(klass->is_klass(), "must be");
230 if (!is_excluded(klass)) {
231 _klasses->append(klass);
232 if (klass->is_hidden()) {
233 assert(klass->is_instance_klass(), "must be");
234 }
235 }
236 } else if (ref->msotype() == MetaspaceObj::SymbolType) {
237 // Make sure the symbol won't be GC'ed while we are dumping the archive.
238 Symbol* sym = (Symbol*)ref->obj();
239 sym->increment_refcount();
240 _symbols->append(sym);
241 }
242
243 return true; // recurse
244 }
245
246 void ArchiveBuilder::gather_klasses_and_symbols() {
247 ResourceMark rm;
248
249 AOTArtifactFinder::initialize();
250 AOTArtifactFinder::find_artifacts();
251
252 log_info(cds)("Gathering classes and symbols ... ");
253 GatherKlassesAndSymbols doit(this);
254 iterate_roots(&doit);
255 #if INCLUDE_CDS_JAVA_HEAP
256 if (CDSConfig::is_dumping_full_module_graph()) {
257 ClassLoaderDataShared::iterate_symbols(&doit);
258 }
259 #endif
260 doit.finish();
261
262 if (CDSConfig::is_dumping_static_archive()) {
263 // To ensure deterministic contents in the static archive, we need to ensure that
264 // we iterate the MetaspaceObjs in a deterministic order. It doesn't matter where
265 // the MetaspaceObjs are located originally, as they are copied sequentially into
266 // the archive during the iteration.
267 //
268 // The only issue here is that the symbol table and the system directories may be
269 // randomly ordered, so we copy the symbols and klasses into two arrays and sort
270 // them deterministically.
271 //
272 // During -Xshare:dump, the order of Symbol creation is strictly determined by
273 // the SharedClassListFile (class loading is done in a single thread and the JIT
274 // is disabled). Also, Symbols are allocated in monotonically increasing addresses
275 // (see Symbol::operator new(size_t, int)). So if we iterate the Symbols by
276 // ascending address order, we ensure that all Symbols are copied into deterministic
277 // locations in the archive.
278 //
279 // TODO: in the future, if we want to produce deterministic contents in the
280 // dynamic archive, we might need to sort the symbols alphabetically (also see
281 // DynamicArchiveBuilder::sort_methods()).
282 log_info(cds)("Sorting symbols ... ");
283 _symbols->sort(compare_symbols_by_address);
284 sort_klasses();
285 }
286
287 AOTClassLinker::add_candidates();
288 }
289
290 int ArchiveBuilder::compare_symbols_by_address(Symbol** a, Symbol** b) {
291 if (a[0] < b[0]) {
292 return -1;
293 } else {
294 assert(a[0] > b[0], "Duplicated symbol %s unexpected", (*a)->as_C_string());
295 return 1;
296 }
297 }
298
299 int ArchiveBuilder::compare_klass_by_name(Klass** a, Klass** b) {
300 return a[0]->name()->fast_compare(b[0]->name());
301 }
302
303 void ArchiveBuilder::sort_klasses() {
304 log_info(cds)("Sorting classes ... ");
305 _klasses->sort(compare_klass_by_name);
306 }
307
308 address ArchiveBuilder::reserve_buffer() {
309 size_t buffer_size = LP64_ONLY(CompressedClassSpaceSize) NOT_LP64(256 * M);
310 ReservedSpace rs = MemoryReserver::reserve(buffer_size,
311 MetaspaceShared::core_region_alignment(),
312 os::vm_page_size());
313 if (!rs.is_reserved()) {
314 log_error(cds)("Failed to reserve %zu bytes of output buffer.", buffer_size);
315 MetaspaceShared::unrecoverable_writing_error();
316 }
317
318 // buffer_bottom is the lowest address of the 2 core regions (rw, ro) when
319 // we are copying the class metadata into the buffer.
320 address buffer_bottom = (address)rs.base();
321 log_info(cds)("Reserved output buffer space at " PTR_FORMAT " [%zu bytes]",
322 p2i(buffer_bottom), buffer_size);
323 _shared_rs = rs;
324
325 _buffer_bottom = buffer_bottom;
326 _current_dump_region = &_rw_region;
327 _num_dump_regions_used = 1;
328 _current_dump_region->init(&_shared_rs, &_shared_vs);
329
330 ArchivePtrMarker::initialize(&_ptrmap, &_shared_vs);
331
332 // The bottom of the static archive should be mapped at this address by default.
333 _requested_static_archive_bottom = (address)MetaspaceShared::requested_base_address();
334
335 // The bottom of the archive (that I am writing now) should be mapped at this address by default.
336 address my_archive_requested_bottom;
337
338 if (CDSConfig::is_dumping_static_archive()) {
339 my_archive_requested_bottom = _requested_static_archive_bottom;
340 } else {
341 _mapped_static_archive_bottom = (address)MetaspaceObj::shared_metaspace_base();
342 _mapped_static_archive_top = (address)MetaspaceObj::shared_metaspace_top();
343 assert(_mapped_static_archive_top >= _mapped_static_archive_bottom, "must be");
344 size_t static_archive_size = _mapped_static_archive_top - _mapped_static_archive_bottom;
345
346 // At run time, we will mmap the dynamic archive at my_archive_requested_bottom
347 _requested_static_archive_top = _requested_static_archive_bottom + static_archive_size;
348 my_archive_requested_bottom = align_up(_requested_static_archive_top, MetaspaceShared::core_region_alignment());
349
350 _requested_dynamic_archive_bottom = my_archive_requested_bottom;
351 }
352
353 _buffer_to_requested_delta = my_archive_requested_bottom - _buffer_bottom;
354
355 address my_archive_requested_top = my_archive_requested_bottom + buffer_size;
356 if (my_archive_requested_bottom < _requested_static_archive_bottom ||
357 my_archive_requested_top <= _requested_static_archive_bottom) {
358 // Size overflow.
359 log_error(cds)("my_archive_requested_bottom = " INTPTR_FORMAT, p2i(my_archive_requested_bottom));
360 log_error(cds)("my_archive_requested_top = " INTPTR_FORMAT, p2i(my_archive_requested_top));
361 log_error(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is too high. "
362 "Please rerun java -Xshare:dump with a lower value", p2i(_requested_static_archive_bottom));
363 MetaspaceShared::unrecoverable_writing_error();
364 }
365
366 if (CDSConfig::is_dumping_static_archive()) {
367 // We don't want any valid object to be at the very bottom of the archive.
368 // See ArchivePtrMarker::mark_pointer().
369 rw_region()->allocate(16);
370 }
371
372 return buffer_bottom;
373 }
374
375 void ArchiveBuilder::iterate_sorted_roots(MetaspaceClosure* it) {
376 int num_symbols = _symbols->length();
377 for (int i = 0; i < num_symbols; i++) {
378 it->push(_symbols->adr_at(i));
379 }
380
381 int num_klasses = _klasses->length();
382 for (int i = 0; i < num_klasses; i++) {
383 it->push(_klasses->adr_at(i));
384 }
385
386 iterate_roots(it);
387 }
388
389 class GatherSortedSourceObjs : public MetaspaceClosure {
390 ArchiveBuilder* _builder;
391
392 public:
393 GatherSortedSourceObjs(ArchiveBuilder* builder) : _builder(builder) {}
394
395 virtual bool do_ref(Ref* ref, bool read_only) {
396 return _builder->gather_one_source_obj(ref, read_only);
397 }
398 };
399
400 bool ArchiveBuilder::gather_one_source_obj(MetaspaceClosure::Ref* ref, bool read_only) {
401 address src_obj = ref->obj();
402 if (src_obj == nullptr) {
403 return false;
404 }
405
406 remember_embedded_pointer_in_enclosing_obj(ref);
407 if (RegeneratedClasses::has_been_regenerated(src_obj)) {
408 // No need to copy it. We will later relocate it to point to the regenerated klass/method.
409 return false;
410 }
411
412 FollowMode follow_mode = get_follow_mode(ref);
413 SourceObjInfo src_info(ref, read_only, follow_mode);
414 bool created;
415 SourceObjInfo* p = _src_obj_table.put_if_absent(src_obj, src_info, &created);
416 if (created) {
417 if (_src_obj_table.maybe_grow()) {
418 log_info(cds, hashtables)("Expanded _src_obj_table table to %d", _src_obj_table.table_size());
419 }
420 }
421
422 #ifdef ASSERT
423 if (ref->msotype() == MetaspaceObj::MethodType) {
424 Method* m = (Method*)ref->obj();
425 assert(!RegeneratedClasses::has_been_regenerated((address)m->method_holder()),
426 "Should not archive methods in a class that has been regenerated");
427 }
428 #endif
429
430 assert(p->read_only() == src_info.read_only(), "must be");
431
432 if (created && src_info.should_copy()) {
433 if (read_only) {
434 _ro_src_objs.append(p);
435 } else {
436 _rw_src_objs.append(p);
437 }
438 return true; // Need to recurse into this ref only if we are copying it
439 } else {
440 return false;
441 }
442 }
443
444 void ArchiveBuilder::record_regenerated_object(address orig_src_obj, address regen_src_obj) {
445 // Record the fact that orig_src_obj has been replaced by regen_src_obj. All calls to get_buffered_addr(orig_src_obj)
446 // should return the same value as get_buffered_addr(regen_src_obj).
447 SourceObjInfo* p = _src_obj_table.get(regen_src_obj);
448 assert(p != nullptr, "regenerated object should always be dumped");
449 SourceObjInfo orig_src_info(orig_src_obj, p);
450 bool created;
451 _src_obj_table.put_if_absent(orig_src_obj, orig_src_info, &created);
452 assert(created, "We shouldn't have archived the original copy of a regenerated object");
453 }
454
455 // Remember that we have a pointer inside ref->enclosing_obj() that points to ref->obj()
456 void ArchiveBuilder::remember_embedded_pointer_in_enclosing_obj(MetaspaceClosure::Ref* ref) {
457 assert(ref->obj() != nullptr, "should have checked");
458
459 address enclosing_obj = ref->enclosing_obj();
460 if (enclosing_obj == nullptr) {
461 return;
462 }
463
464 // We are dealing with 3 addresses:
465 // address o = ref->obj(): We have found an object whose address is o.
466 // address* mpp = ref->mpp(): The object o is pointed to by a pointer whose address is mpp.
467 // I.e., (*mpp == o)
468 // enclosing_obj : If non-null, it is the object which has a field that points to o.
469 // mpp is the address if that field.
470 //
471 // Example: We have an array whose first element points to a Method:
472 // Method* o = 0x0000abcd;
473 // Array<Method*>* enclosing_obj = 0x00001000;
474 // enclosing_obj->at_put(0, o);
475 //
476 // We the MetaspaceClosure iterates on the very first element of this array, we have
477 // ref->obj() == 0x0000abcd (the Method)
478 // ref->mpp() == 0x00001008 (the location of the first element in the array)
479 // ref->enclosing_obj() == 0x00001000 (the Array that contains the Method)
480 //
481 // We use the above information to mark the bitmap to indicate that there's a pointer on address 0x00001008.
482 SourceObjInfo* src_info = _src_obj_table.get(enclosing_obj);
483 if (src_info == nullptr || !src_info->should_copy()) {
484 // source objects of point_to_it/set_to_null types are not copied
485 // so we don't need to remember their pointers.
486 } else {
487 if (src_info->read_only()) {
488 _ro_src_objs.remember_embedded_pointer(src_info, ref);
489 } else {
490 _rw_src_objs.remember_embedded_pointer(src_info, ref);
491 }
492 }
493 }
494
495 void ArchiveBuilder::gather_source_objs() {
496 ResourceMark rm;
497 log_info(cds)("Gathering all archivable objects ... ");
498 gather_klasses_and_symbols();
499 GatherSortedSourceObjs doit(this);
500 iterate_sorted_roots(&doit);
501 doit.finish();
502 }
503
504 bool ArchiveBuilder::is_excluded(Klass* klass) {
505 if (klass->is_instance_klass()) {
506 InstanceKlass* ik = InstanceKlass::cast(klass);
507 return SystemDictionaryShared::is_excluded_class(ik);
508 } else if (klass->is_objArray_klass()) {
509 Klass* bottom = ObjArrayKlass::cast(klass)->bottom_klass();
510 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_shared_static(bottom)) {
511 // The bottom class is in the static archive so it's clearly not excluded.
512 return false;
513 } else if (bottom->is_instance_klass()) {
514 return SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(bottom));
515 }
516 }
517
518 return false;
519 }
520
521 ArchiveBuilder::FollowMode ArchiveBuilder::get_follow_mode(MetaspaceClosure::Ref *ref) {
522 address obj = ref->obj();
523 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_in_shared_metaspace(obj)) {
524 // Don't dump existing shared metadata again.
525 return point_to_it;
526 } else if (ref->msotype() == MetaspaceObj::MethodDataType ||
527 ref->msotype() == MetaspaceObj::MethodCountersType) {
528 return set_to_null;
529 } else {
530 if (ref->msotype() == MetaspaceObj::ClassType) {
531 Klass* klass = (Klass*)ref->obj();
532 assert(klass->is_klass(), "must be");
533 if (is_excluded(klass)) {
534 ResourceMark rm;
535 log_debug(cds, dynamic)("Skipping class (excluded): %s", klass->external_name());
536 return set_to_null;
537 }
538 }
539
540 return make_a_copy;
541 }
542 }
543
544 void ArchiveBuilder::start_dump_region(DumpRegion* next) {
545 current_dump_region()->pack(next);
546 _current_dump_region = next;
547 _num_dump_regions_used ++;
548 }
549
550 char* ArchiveBuilder::ro_strdup(const char* s) {
551 char* archived_str = ro_region_alloc((int)strlen(s) + 1);
552 strcpy(archived_str, s);
553 return archived_str;
554 }
555
556 // The objects that have embedded pointers will sink
557 // towards the end of the list. This ensures we have a maximum
558 // number of leading zero bits in the relocation bitmap.
559 int ArchiveBuilder::compare_src_objs(SourceObjInfo** a, SourceObjInfo** b) {
560 if ((*a)->has_embedded_pointer() && !(*b)->has_embedded_pointer()) {
561 return 1;
562 } else if (!(*a)->has_embedded_pointer() && (*b)->has_embedded_pointer()) {
563 return -1;
564 } else {
565 // This is necessary to keep the sorting order stable. Otherwise the
566 // archive's contents may not be deterministic.
567 return (*a)->id() - (*b)->id();
568 }
569 }
570
571 void ArchiveBuilder::sort_metadata_objs() {
572 _rw_src_objs.objs()->sort(compare_src_objs);
573 _ro_src_objs.objs()->sort(compare_src_objs);
574 }
575
576 void ArchiveBuilder::dump_rw_metadata() {
577 ResourceMark rm;
578 log_info(cds)("Allocating RW objects ... ");
579 make_shallow_copies(&_rw_region, &_rw_src_objs);
580
581 #if INCLUDE_CDS_JAVA_HEAP
582 if (CDSConfig::is_dumping_full_module_graph()) {
583 // Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
584 char* start = rw_region()->top();
585 ClassLoaderDataShared::allocate_archived_tables();
586 alloc_stats()->record_modules(rw_region()->top() - start, /*read_only*/false);
587 }
588 #endif
589 }
590
591 void ArchiveBuilder::dump_ro_metadata() {
592 ResourceMark rm;
593 log_info(cds)("Allocating RO objects ... ");
594
595 start_dump_region(&_ro_region);
596 make_shallow_copies(&_ro_region, &_ro_src_objs);
597
598 #if INCLUDE_CDS_JAVA_HEAP
599 if (CDSConfig::is_dumping_full_module_graph()) {
600 char* start = ro_region()->top();
601 ClassLoaderDataShared::init_archived_tables();
602 alloc_stats()->record_modules(ro_region()->top() - start, /*read_only*/true);
603 }
604 #endif
605
606 RegeneratedClasses::record_regenerated_objects();
607 }
608
609 void ArchiveBuilder::make_shallow_copies(DumpRegion *dump_region,
610 const ArchiveBuilder::SourceObjList* src_objs) {
611 for (int i = 0; i < src_objs->objs()->length(); i++) {
612 make_shallow_copy(dump_region, src_objs->objs()->at(i));
613 }
614 log_info(cds)("done (%d objects)", src_objs->objs()->length());
615 }
616
617 void ArchiveBuilder::make_shallow_copy(DumpRegion *dump_region, SourceObjInfo* src_info) {
618 address src = src_info->source_addr();
619 int bytes = src_info->size_in_bytes();
620 char* dest;
621 char* oldtop;
622 char* newtop;
623
624 oldtop = dump_region->top();
625 if (src_info->msotype() == MetaspaceObj::ClassType) {
626 // Allocate space for a pointer directly in front of the future InstanceKlass, so
627 // we can do a quick lookup from InstanceKlass* -> RunTimeClassInfo*
628 // without building another hashtable. See RunTimeClassInfo::get_for()
629 // in systemDictionaryShared.cpp.
630 Klass* klass = (Klass*)src;
631 if (klass->is_instance_klass()) {
632 SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
633 dump_region->allocate(sizeof(address));
634 }
635 // Allocate space for the future InstanceKlass with proper alignment
636 const size_t alignment =
637 #ifdef _LP64
638 UseCompressedClassPointers ?
639 nth_bit(ArchiveBuilder::precomputed_narrow_klass_shift()) :
640 SharedSpaceObjectAlignment;
641 #else
642 SharedSpaceObjectAlignment;
643 #endif
644 dest = dump_region->allocate(bytes, alignment);
645 } else {
646 dest = dump_region->allocate(bytes);
647 }
648 newtop = dump_region->top();
649
650 memcpy(dest, src, bytes);
651
652 // Update the hash of buffered sorted symbols for static dump so that the symbols have deterministic contents
653 if (CDSConfig::is_dumping_static_archive() && (src_info->msotype() == MetaspaceObj::SymbolType)) {
654 Symbol* buffered_symbol = (Symbol*)dest;
655 assert(((Symbol*)src)->is_permanent(), "archived symbols must be permanent");
656 buffered_symbol->update_identity_hash();
657 }
658
659 {
660 bool created;
661 _buffered_to_src_table.put_if_absent((address)dest, src, &created);
662 assert(created, "must be");
663 if (_buffered_to_src_table.maybe_grow()) {
664 log_info(cds, hashtables)("Expanded _buffered_to_src_table table to %d", _buffered_to_src_table.table_size());
665 }
666 }
667
668 intptr_t* archived_vtable = CppVtables::get_archived_vtable(src_info->msotype(), (address)dest);
669 if (archived_vtable != nullptr) {
670 *(address*)dest = (address)archived_vtable;
671 ArchivePtrMarker::mark_pointer((address*)dest);
672 }
673
674 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(src), p2i(dest), bytes);
675 src_info->set_buffered_addr((address)dest);
676
677 _alloc_stats.record(src_info->msotype(), int(newtop - oldtop), src_info->read_only());
678
679 DEBUG_ONLY(_alloc_stats.verify((int)dump_region->used(), src_info->read_only()));
680 }
681
682 // This is used by code that hand-assembles data structures, such as the LambdaProxyClassKey, that are
683 // not handled by MetaspaceClosure.
684 void ArchiveBuilder::write_pointer_in_buffer(address* ptr_location, address src_addr) {
685 assert(is_in_buffer_space(ptr_location), "must be");
686 if (src_addr == nullptr) {
687 *ptr_location = nullptr;
688 ArchivePtrMarker::clear_pointer(ptr_location);
689 } else {
690 *ptr_location = get_buffered_addr(src_addr);
691 ArchivePtrMarker::mark_pointer(ptr_location);
692 }
693 }
694
695 void ArchiveBuilder::mark_and_relocate_to_buffered_addr(address* ptr_location) {
696 assert(*ptr_location != nullptr, "sanity");
697 if (!is_in_mapped_static_archive(*ptr_location)) {
698 *ptr_location = get_buffered_addr(*ptr_location);
699 }
700 ArchivePtrMarker::mark_pointer(ptr_location);
701 }
702
703 bool ArchiveBuilder::has_been_buffered(address src_addr) const {
704 if (RegeneratedClasses::has_been_regenerated(src_addr) ||
705 _src_obj_table.get(src_addr) == nullptr ||
706 get_buffered_addr(src_addr) == nullptr) {
707 return false;
708 } else {
709 return true;
710 }
711 }
712
713 address ArchiveBuilder::get_buffered_addr(address src_addr) const {
714 SourceObjInfo* p = _src_obj_table.get(src_addr);
715 assert(p != nullptr, "src_addr " INTPTR_FORMAT " is used but has not been archived",
716 p2i(src_addr));
717
718 return p->buffered_addr();
719 }
720
721 address ArchiveBuilder::get_source_addr(address buffered_addr) const {
722 assert(is_in_buffer_space(buffered_addr), "must be");
723 address* src_p = _buffered_to_src_table.get(buffered_addr);
724 assert(src_p != nullptr && *src_p != nullptr, "must be");
725 return *src_p;
726 }
727
728 void ArchiveBuilder::relocate_embedded_pointers(ArchiveBuilder::SourceObjList* src_objs) {
729 for (int i = 0; i < src_objs->objs()->length(); i++) {
730 src_objs->relocate(i, this);
731 }
732 }
733
734 void ArchiveBuilder::relocate_metaspaceobj_embedded_pointers() {
735 log_info(cds)("Relocating embedded pointers in core regions ... ");
736 relocate_embedded_pointers(&_rw_src_objs);
737 relocate_embedded_pointers(&_ro_src_objs);
738 }
739
740 #define ADD_COUNT(x) \
741 x += 1; \
742 x ## _a += aotlinked ? 1 : 0; \
743 x ## _i += inited ? 1 : 0;
744
745 #define DECLARE_INSTANCE_KLASS_COUNTER(x) \
746 int x = 0; \
747 int x ## _a = 0; \
748 int x ## _i = 0;
749
750 void ArchiveBuilder::make_klasses_shareable() {
751 DECLARE_INSTANCE_KLASS_COUNTER(num_instance_klasses);
752 DECLARE_INSTANCE_KLASS_COUNTER(num_boot_klasses);
753 DECLARE_INSTANCE_KLASS_COUNTER(num_vm_klasses);
754 DECLARE_INSTANCE_KLASS_COUNTER(num_platform_klasses);
755 DECLARE_INSTANCE_KLASS_COUNTER(num_app_klasses);
756 DECLARE_INSTANCE_KLASS_COUNTER(num_old_klasses);
757 DECLARE_INSTANCE_KLASS_COUNTER(num_hidden_klasses);
758 DECLARE_INSTANCE_KLASS_COUNTER(num_enum_klasses);
759 DECLARE_INSTANCE_KLASS_COUNTER(num_unregistered_klasses);
760 int num_unlinked_klasses = 0;
761 int num_obj_array_klasses = 0;
762 int num_type_array_klasses = 0;
763
764 int boot_unlinked = 0;
765 int platform_unlinked = 0;
766 int app_unlinked = 0;
767 int unreg_unlinked = 0;
768
769 for (int i = 0; i < klasses()->length(); i++) {
770 // Some of the code in ConstantPool::remove_unshareable_info() requires the classes
771 // to be in linked state, so it must be call here before the next loop, which returns
772 // all classes to unlinked state.
773 Klass* k = get_buffered_addr(klasses()->at(i));
774 if (k->is_instance_klass()) {
775 InstanceKlass::cast(k)->constants()->remove_unshareable_info();
776 }
777 }
778
779 for (int i = 0; i < klasses()->length(); i++) {
780 const char* type;
781 const char* unlinked = "";
782 const char* kind = "";
783 const char* hidden = "";
784 const char* old = "";
785 const char* generated = "";
786 const char* aotlinked_msg = "";
787 const char* inited_msg = "";
788 Klass* k = get_buffered_addr(klasses()->at(i));
789 k->remove_java_mirror();
790 #ifdef _LP64
791 if (UseCompactObjectHeaders) {
792 Klass* requested_k = to_requested(k);
793 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
794 const int narrow_klass_shift = precomputed_narrow_klass_shift();
795 narrowKlass nk = CompressedKlassPointers::encode_not_null_without_asserts(requested_k, narrow_klass_base, narrow_klass_shift);
796 k->set_prototype_header(markWord::prototype().set_narrow_klass(nk));
797 }
798 #endif //_LP64
799 if (k->is_objArray_klass()) {
800 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
801 // on their array classes.
802 num_obj_array_klasses ++;
803 type = "array";
804 } else if (k->is_typeArray_klass()) {
805 num_type_array_klasses ++;
806 type = "array";
807 k->remove_unshareable_info();
808 } else {
809 assert(k->is_instance_klass(), " must be");
810 InstanceKlass* ik = InstanceKlass::cast(k);
811 InstanceKlass* src_ik = get_source_addr(ik);
812 bool aotlinked = AOTClassLinker::is_candidate(src_ik);
813 bool inited = ik->has_aot_initialized_mirror();
814 ADD_COUNT(num_instance_klasses);
815 if (CDSConfig::is_dumping_dynamic_archive()) {
816 // For static dump, class loader type are already set.
817 ik->assign_class_loader_type();
818 }
819 if (ik->is_hidden()) {
820 ADD_COUNT(num_hidden_klasses);
821 hidden = " hidden";
822 oop loader = k->class_loader();
823 if (loader == nullptr) {
824 type = "boot";
825 ADD_COUNT(num_boot_klasses);
826 } else if (loader == SystemDictionary::java_platform_loader()) {
827 type = "plat";
828 ADD_COUNT(num_platform_klasses);
829 } else if (loader == SystemDictionary::java_system_loader()) {
830 type = "app";
831 ADD_COUNT(num_app_klasses);
832 } else {
833 type = "bad";
834 assert(0, "shouldn't happen");
835 }
836 if (CDSConfig::is_dumping_invokedynamic()) {
837 assert(HeapShared::is_archivable_hidden_klass(ik), "sanity");
838 } else {
839 // Legacy CDS support for lambda proxies
840 CDS_JAVA_HEAP_ONLY(assert(HeapShared::is_lambda_proxy_klass(ik), "sanity");)
841 }
842 } else if (ik->is_shared_boot_class()) {
843 type = "boot";
844 ADD_COUNT(num_boot_klasses);
845 } else if (ik->is_shared_platform_class()) {
846 type = "plat";
847 ADD_COUNT(num_platform_klasses);
848 } else if (ik->is_shared_app_class()) {
849 type = "app";
850 ADD_COUNT(num_app_klasses);
851 } else {
852 assert(ik->is_shared_unregistered_class(), "must be");
853 type = "unreg";
854 ADD_COUNT(num_unregistered_klasses);
855 }
856
857 if (AOTClassLinker::is_vm_class(src_ik)) {
858 ADD_COUNT(num_vm_klasses);
859 }
860
861 if (!ik->is_linked()) {
862 num_unlinked_klasses ++;
863 unlinked = " unlinked";
864 if (ik->is_shared_boot_class()) {
865 boot_unlinked ++;
866 } else if (ik->is_shared_platform_class()) {
867 platform_unlinked ++;
868 } else if (ik->is_shared_app_class()) {
869 app_unlinked ++;
870 } else {
871 unreg_unlinked ++;
872 }
873 }
874
875 if (ik->is_interface()) {
876 kind = " interface";
877 } else if (src_ik->is_enum_subclass()) {
878 kind = " enum";
879 ADD_COUNT(num_enum_klasses);
880 }
881
882 if (!ik->can_be_verified_at_dumptime()) {
883 ADD_COUNT(num_old_klasses);
884 old = " old";
885 }
886
887 if (ik->is_generated_shared_class()) {
888 generated = " generated";
889 }
890 if (aotlinked) {
891 aotlinked_msg = " aot-linked";
892 }
893 if (inited) {
894 inited_msg = " inited";
895 }
896
897 MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread::current(), ik);
898 ik->remove_unshareable_info();
899 }
900
901 if (log_is_enabled(Debug, cds, class)) {
902 ResourceMark rm;
903 log_debug(cds, class)("klasses[%5d] = " PTR_FORMAT " %-5s %s%s%s%s%s%s%s%s", i,
904 p2i(to_requested(k)), type, k->external_name(),
905 kind, hidden, old, unlinked, generated, aotlinked_msg, inited_msg);
906 }
907 }
908
909 #define STATS_FORMAT "= %5d, aot-linked = %5d, inited = %5d"
910 #define STATS_PARAMS(x) num_ ## x, num_ ## x ## _a, num_ ## x ## _i
911
912 log_info(cds)("Number of classes %d", num_instance_klasses + num_obj_array_klasses + num_type_array_klasses);
913 log_info(cds)(" instance classes " STATS_FORMAT, STATS_PARAMS(instance_klasses));
914 log_info(cds)(" boot " STATS_FORMAT, STATS_PARAMS(boot_klasses));
915 log_info(cds)(" vm " STATS_FORMAT, STATS_PARAMS(vm_klasses));
916 log_info(cds)(" platform " STATS_FORMAT, STATS_PARAMS(platform_klasses));
917 log_info(cds)(" app " STATS_FORMAT, STATS_PARAMS(app_klasses));
918 log_info(cds)(" unregistered " STATS_FORMAT, STATS_PARAMS(unregistered_klasses));
919 log_info(cds)(" (enum) " STATS_FORMAT, STATS_PARAMS(enum_klasses));
920 log_info(cds)(" (hidden) " STATS_FORMAT, STATS_PARAMS(hidden_klasses));
921 log_info(cds)(" (old) " STATS_FORMAT, STATS_PARAMS(old_klasses));
922 log_info(cds)(" (unlinked) = %5d, boot = %d, plat = %d, app = %d, unreg = %d",
923 num_unlinked_klasses, boot_unlinked, platform_unlinked, app_unlinked, unreg_unlinked);
924 log_info(cds)(" obj array classes = %5d", num_obj_array_klasses);
925 log_info(cds)(" type array classes = %5d", num_type_array_klasses);
926 log_info(cds)(" symbols = %5d", _symbols->length());
927
928 #undef STATS_FORMAT
929 #undef STATS_PARAMS
930
931 DynamicArchive::make_array_klasses_shareable();
932 }
933
934 void ArchiveBuilder::serialize_dynamic_archivable_items(SerializeClosure* soc) {
935 SymbolTable::serialize_shared_table_header(soc, false);
936 SystemDictionaryShared::serialize_dictionary_headers(soc, false);
937 DynamicArchive::serialize_array_klasses(soc);
938 AOTLinkedClassBulkLoader::serialize(soc, false);
939 }
940
941 uintx ArchiveBuilder::buffer_to_offset(address p) const {
942 address requested_p = to_requested(p);
943 assert(requested_p >= _requested_static_archive_bottom, "must be");
944 return requested_p - _requested_static_archive_bottom;
945 }
946
947 uintx ArchiveBuilder::any_to_offset(address p) const {
948 if (is_in_mapped_static_archive(p)) {
949 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
950 return p - _mapped_static_archive_bottom;
951 }
952 if (!is_in_buffer_space(p)) {
953 // p must be a "source" address
954 p = get_buffered_addr(p);
955 }
956 return buffer_to_offset(p);
957 }
958
959 address ArchiveBuilder::offset_to_buffered_address(u4 offset) const {
960 address requested_addr = _requested_static_archive_bottom + offset;
961 address buffered_addr = requested_addr - _buffer_to_requested_delta;
962 assert(is_in_buffer_space(buffered_addr), "bad offset");
963 return buffered_addr;
964 }
965
966 #if INCLUDE_CDS_JAVA_HEAP
967 narrowKlass ArchiveBuilder::get_requested_narrow_klass(Klass* k) {
968 assert(CDSConfig::is_dumping_heap(), "sanity");
969 k = get_buffered_klass(k);
970 Klass* requested_k = to_requested(k);
971 const int narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
972 #ifdef ASSERT
973 const size_t klass_alignment = MAX2(SharedSpaceObjectAlignment, (size_t)nth_bit(narrow_klass_shift));
974 assert(is_aligned(k, klass_alignment), "Klass " PTR_FORMAT " misaligned.", p2i(k));
975 #endif
976 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
977 // Note: use the "raw" version of encode that takes explicit narrow klass base and shift. Don't use any
978 // of the variants that do sanity checks, nor any of those that use the current - dump - JVM's encoding setting.
979 return CompressedKlassPointers::encode_not_null_without_asserts(requested_k, narrow_klass_base, narrow_klass_shift);
980 }
981 #endif // INCLUDE_CDS_JAVA_HEAP
982
983 // RelocateBufferToRequested --- Relocate all the pointers in rw/ro,
984 // so that the archive can be mapped to the "requested" location without runtime relocation.
985 //
986 // - See ArchiveBuilder header for the definition of "buffer", "mapped" and "requested"
987 // - ArchivePtrMarker::ptrmap() marks all the pointers in the rw/ro regions
988 // - Every pointer must have one of the following values:
989 // [a] nullptr:
990 // No relocation is needed. Remove this pointer from ptrmap so we don't need to
991 // consider it at runtime.
992 // [b] Points into an object X which is inside the buffer:
993 // Adjust this pointer by _buffer_to_requested_delta, so it points to X
994 // when the archive is mapped at the requested location.
995 // [c] Points into an object Y which is inside mapped static archive:
996 // - This happens only during dynamic dump
997 // - Adjust this pointer by _mapped_to_requested_static_archive_delta,
998 // so it points to Y when the static archive is mapped at the requested location.
999 template <bool STATIC_DUMP>
1000 class RelocateBufferToRequested : public BitMapClosure {
1001 ArchiveBuilder* _builder;
1002 address _buffer_bottom;
1003 intx _buffer_to_requested_delta;
1004 intx _mapped_to_requested_static_archive_delta;
1005 size_t _max_non_null_offset;
1006
1007 public:
1008 RelocateBufferToRequested(ArchiveBuilder* builder) {
1009 _builder = builder;
1010 _buffer_bottom = _builder->buffer_bottom();
1011 _buffer_to_requested_delta = builder->buffer_to_requested_delta();
1012 _mapped_to_requested_static_archive_delta = builder->requested_static_archive_bottom() - builder->mapped_static_archive_bottom();
1013 _max_non_null_offset = 0;
1014
1015 address bottom = _builder->buffer_bottom();
1016 address top = _builder->buffer_top();
1017 address new_bottom = bottom + _buffer_to_requested_delta;
1018 address new_top = top + _buffer_to_requested_delta;
1019 log_debug(cds)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT "] to "
1020 "[" INTPTR_FORMAT " - " INTPTR_FORMAT "]",
1021 p2i(bottom), p2i(top),
1022 p2i(new_bottom), p2i(new_top));
1023 }
1024
1025 bool do_bit(size_t offset) {
1026 address* p = (address*)_buffer_bottom + offset;
1027 assert(_builder->is_in_buffer_space(p), "pointer must live in buffer space");
1028
1029 if (*p == nullptr) {
1030 // todo -- clear bit, etc
1031 ArchivePtrMarker::ptrmap()->clear_bit(offset);
1032 } else {
1033 if (STATIC_DUMP) {
1034 assert(_builder->is_in_buffer_space(*p), "old pointer must point inside buffer space");
1035 *p += _buffer_to_requested_delta;
1036 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1037 } else {
1038 if (_builder->is_in_buffer_space(*p)) {
1039 *p += _buffer_to_requested_delta;
1040 // assert is in requested dynamic archive
1041 } else {
1042 assert(_builder->is_in_mapped_static_archive(*p), "old pointer must point inside buffer space or mapped static archive");
1043 *p += _mapped_to_requested_static_archive_delta;
1044 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1045 }
1046 }
1047 _max_non_null_offset = offset;
1048 }
1049
1050 return true; // keep iterating
1051 }
1052
1053 void doit() {
1054 ArchivePtrMarker::ptrmap()->iterate(this);
1055 ArchivePtrMarker::compact(_max_non_null_offset);
1056 }
1057 };
1058
1059 #ifdef _LP64
1060 int ArchiveBuilder::precomputed_narrow_klass_shift() {
1061 // Legacy Mode:
1062 // We use 32 bits for narrowKlass, which should cover the full 4G Klass range. Shift can be 0.
1063 // CompactObjectHeader Mode:
1064 // narrowKlass is much smaller, and we use the highest possible shift value to later get the maximum
1065 // Klass encoding range.
1066 //
1067 // Note that all of this may change in the future, if we decide to correct the pre-calculated
1068 // narrow Klass IDs at archive load time.
1069 assert(UseCompressedClassPointers, "Only needed for compressed class pointers");
1070 return UseCompactObjectHeaders ? CompressedKlassPointers::max_shift() : 0;
1071 }
1072 #endif // _LP64
1073
1074 void ArchiveBuilder::relocate_to_requested() {
1075 ro_region()->pack();
1076
1077 size_t my_archive_size = buffer_top() - buffer_bottom();
1078
1079 if (CDSConfig::is_dumping_static_archive()) {
1080 _requested_static_archive_top = _requested_static_archive_bottom + my_archive_size;
1081 RelocateBufferToRequested<true> patcher(this);
1082 patcher.doit();
1083 } else {
1084 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1085 _requested_dynamic_archive_top = _requested_dynamic_archive_bottom + my_archive_size;
1086 RelocateBufferToRequested<false> patcher(this);
1087 patcher.doit();
1088 }
1089 }
1090
1091 // Write detailed info to a mapfile to analyze contents of the archive.
1092 // static dump:
1093 // java -Xshare:dump -Xlog:cds+map=trace:file=cds.map:none:filesize=0
1094 // dynamic dump:
1095 // java -cp MyApp.jar -XX:ArchiveClassesAtExit=MyApp.jsa \
1096 // -Xlog:cds+map=trace:file=cds.map:none:filesize=0 MyApp
1097 //
1098 // We need to do some address translation because the buffers used at dump time may be mapped to
1099 // a different location at runtime. At dump time, the buffers may be at arbitrary locations
1100 // picked by the OS. At runtime, we try to map at a fixed location (SharedBaseAddress). For
1101 // consistency, we log everything using runtime addresses.
1102 class ArchiveBuilder::CDSMapLogger : AllStatic {
1103 static intx buffer_to_runtime_delta() {
1104 // Translate the buffers used by the RW/RO regions to their eventual (requested) locations
1105 // at runtime.
1106 return ArchiveBuilder::current()->buffer_to_requested_delta();
1107 }
1108
1109 // rw/ro regions only
1110 static void log_metaspace_region(const char* name, DumpRegion* region,
1111 const ArchiveBuilder::SourceObjList* src_objs) {
1112 address region_base = address(region->base());
1113 address region_top = address(region->top());
1114 log_region(name, region_base, region_top, region_base + buffer_to_runtime_delta());
1115 log_metaspace_objects(region, src_objs);
1116 }
1117
1118 #define _LOG_PREFIX PTR_FORMAT ": @@ %-17s %d"
1119
1120 static void log_klass(Klass* k, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1121 ResourceMark rm(current);
1122 log_debug(cds, map)(_LOG_PREFIX " %s",
1123 p2i(runtime_dest), type_name, bytes, k->external_name());
1124 }
1125 static void log_method(Method* m, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1126 ResourceMark rm(current);
1127 log_debug(cds, map)(_LOG_PREFIX " %s",
1128 p2i(runtime_dest), type_name, bytes, m->external_name());
1129 }
1130
1131 // rw/ro regions only
1132 static void log_metaspace_objects(DumpRegion* region, const ArchiveBuilder::SourceObjList* src_objs) {
1133 address last_obj_base = address(region->base());
1134 address last_obj_end = address(region->base());
1135 address region_end = address(region->end());
1136 Thread* current = Thread::current();
1137 for (int i = 0; i < src_objs->objs()->length(); i++) {
1138 SourceObjInfo* src_info = src_objs->at(i);
1139 address src = src_info->source_addr();
1140 address dest = src_info->buffered_addr();
1141 log_as_hex(last_obj_base, dest, last_obj_base + buffer_to_runtime_delta());
1142 address runtime_dest = dest + buffer_to_runtime_delta();
1143 int bytes = src_info->size_in_bytes();
1144
1145 MetaspaceObj::Type type = src_info->msotype();
1146 const char* type_name = MetaspaceObj::type_name(type);
1147
1148 switch (type) {
1149 case MetaspaceObj::ClassType:
1150 log_klass((Klass*)src, runtime_dest, type_name, bytes, current);
1151 break;
1152 case MetaspaceObj::ConstantPoolType:
1153 log_klass(((ConstantPool*)src)->pool_holder(),
1154 runtime_dest, type_name, bytes, current);
1155 break;
1156 case MetaspaceObj::ConstantPoolCacheType:
1157 log_klass(((ConstantPoolCache*)src)->constant_pool()->pool_holder(),
1158 runtime_dest, type_name, bytes, current);
1159 break;
1160 case MetaspaceObj::MethodType:
1161 log_method((Method*)src, runtime_dest, type_name, bytes, current);
1162 break;
1163 case MetaspaceObj::ConstMethodType:
1164 log_method(((ConstMethod*)src)->method(), runtime_dest, type_name, bytes, current);
1165 break;
1166 case MetaspaceObj::SymbolType:
1167 {
1168 ResourceMark rm(current);
1169 Symbol* s = (Symbol*)src;
1170 log_debug(cds, map)(_LOG_PREFIX " %s", p2i(runtime_dest), type_name, bytes,
1171 s->as_quoted_ascii());
1172 }
1173 break;
1174 default:
1175 log_debug(cds, map)(_LOG_PREFIX, p2i(runtime_dest), type_name, bytes);
1176 break;
1177 }
1178
1179 last_obj_base = dest;
1180 last_obj_end = dest + bytes;
1181 }
1182
1183 log_as_hex(last_obj_base, last_obj_end, last_obj_base + buffer_to_runtime_delta());
1184 if (last_obj_end < region_end) {
1185 log_debug(cds, map)(PTR_FORMAT ": @@ Misc data %zu bytes",
1186 p2i(last_obj_end + buffer_to_runtime_delta()),
1187 size_t(region_end - last_obj_end));
1188 log_as_hex(last_obj_end, region_end, last_obj_end + buffer_to_runtime_delta());
1189 }
1190 }
1191
1192 #undef _LOG_PREFIX
1193
1194 // Log information about a region, whose address at dump time is [base .. top). At
1195 // runtime, this region will be mapped to requested_base. requested_base is 0 if this
1196 // region will be mapped at os-selected addresses (such as the bitmap region), or will
1197 // be accessed with os::read (the header).
1198 //
1199 // Note: across -Xshare:dump runs, base may be different, but requested_base should
1200 // be the same as the archive contents should be deterministic.
1201 static void log_region(const char* name, address base, address top, address requested_base) {
1202 size_t size = top - base;
1203 base = requested_base;
1204 top = requested_base + size;
1205 log_info(cds, map)("[%-18s " PTR_FORMAT " - " PTR_FORMAT " %9zu bytes]",
1206 name, p2i(base), p2i(top), size);
1207 }
1208
1209 #if INCLUDE_CDS_JAVA_HEAP
1210 static void log_heap_region(ArchiveHeapInfo* heap_info) {
1211 MemRegion r = heap_info->buffer_region();
1212 address start = address(r.start()); // start of the current oop inside the buffer
1213 address end = address(r.end());
1214 log_region("heap", start, end, ArchiveHeapWriter::buffered_addr_to_requested_addr(start));
1215
1216 LogStreamHandle(Info, cds, map) st;
1217
1218 HeapRootSegments segments = heap_info->heap_root_segments();
1219 assert(segments.base_offset() == 0, "Sanity");
1220
1221 for (size_t seg_idx = 0; seg_idx < segments.count(); seg_idx++) {
1222 address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1223 st.print_cr(PTR_FORMAT ": Heap roots segment [%d]",
1224 p2i(requested_start), segments.size_in_elems(seg_idx));
1225 start += segments.size_in_bytes(seg_idx);
1226 }
1227 log_heap_roots();
1228
1229 while (start < end) {
1230 size_t byte_size;
1231 oop source_oop = ArchiveHeapWriter::buffered_addr_to_source_obj(start);
1232 address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1233 st.print(PTR_FORMAT ": @@ Object ", p2i(requested_start));
1234
1235 if (source_oop != nullptr) {
1236 // This is a regular oop that got archived.
1237 // Don't print the requested addr again as we have just printed it at the beginning of the line.
1238 // Example:
1239 // 0x00000007ffd27938: @@ Object (0xfffa4f27) java.util.HashMap
1240 print_oop_info_cr(&st, source_oop, /*print_requested_addr=*/false);
1241 byte_size = source_oop->size() * BytesPerWord;
1242 } else if ((byte_size = ArchiveHeapWriter::get_filler_size_at(start)) > 0) {
1243 // We have a filler oop, which also does not exist in BufferOffsetToSourceObjectTable.
1244 // Example:
1245 // 0x00000007ffc3ffd8: @@ Object filler 40 bytes
1246 st.print_cr("filler %zu bytes", byte_size);
1247 } else {
1248 ShouldNotReachHere();
1249 }
1250
1251 address oop_end = start + byte_size;
1252 log_as_hex(start, oop_end, requested_start, /*is_heap=*/true);
1253
1254 if (source_oop != nullptr) {
1255 log_oop_details(heap_info, source_oop, /*buffered_addr=*/start);
1256 }
1257 start = oop_end;
1258 }
1259 }
1260
1261 // ArchivedFieldPrinter is used to print the fields of archived objects. We can't
1262 // use _source_obj->print_on(), because we want to print the oop fields
1263 // in _source_obj with their requested addresses using print_oop_info_cr().
1264 class ArchivedFieldPrinter : public FieldClosure {
1265 ArchiveHeapInfo* _heap_info;
1266 outputStream* _st;
1267 oop _source_obj;
1268 address _buffered_addr;
1269 public:
1270 ArchivedFieldPrinter(ArchiveHeapInfo* heap_info, outputStream* st, oop src_obj, address buffered_addr) :
1271 _heap_info(heap_info), _st(st), _source_obj(src_obj), _buffered_addr(buffered_addr) {}
1272
1273 void do_field(fieldDescriptor* fd) {
1274 _st->print(" - ");
1275 BasicType ft = fd->field_type();
1276 switch (ft) {
1277 case T_ARRAY:
1278 case T_OBJECT:
1279 {
1280 fd->print_on(_st); // print just the name and offset
1281 oop obj = _source_obj->obj_field(fd->offset());
1282 if (java_lang_Class::is_instance(obj)) {
1283 obj = HeapShared::scratch_java_mirror(obj);
1284 }
1285 print_oop_info_cr(_st, obj);
1286 }
1287 break;
1288 default:
1289 if (ArchiveHeapWriter::is_marked_as_native_pointer(_heap_info, _source_obj, fd->offset())) {
1290 print_as_native_pointer(fd);
1291 } else {
1292 fd->print_on_for(_st, cast_to_oop(_buffered_addr)); // name, offset, value
1293 _st->cr();
1294 }
1295 }
1296 }
1297
1298 void print_as_native_pointer(fieldDescriptor* fd) {
1299 LP64_ONLY(assert(fd->field_type() == T_LONG, "must be"));
1300 NOT_LP64 (assert(fd->field_type() == T_INT, "must be"));
1301
1302 // We have a field that looks like an integer, but it's actually a pointer to a MetaspaceObj.
1303 address source_native_ptr = (address)
1304 LP64_ONLY(_source_obj->long_field(fd->offset()))
1305 NOT_LP64( _source_obj->int_field (fd->offset()));
1306 ArchiveBuilder* builder = ArchiveBuilder::current();
1307
1308 // The value of the native pointer at runtime.
1309 address requested_native_ptr = builder->to_requested(builder->get_buffered_addr(source_native_ptr));
1310
1311 // The address of _source_obj at runtime
1312 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(_source_obj);
1313 // The address of this field in the requested space
1314 assert(requested_obj != nullptr, "Attempting to load field from null oop");
1315 address requested_field_addr = cast_from_oop<address>(requested_obj) + fd->offset();
1316
1317 fd->print_on(_st);
1318 _st->print_cr(PTR_FORMAT " (marked metadata pointer @" PTR_FORMAT " )",
1319 p2i(requested_native_ptr), p2i(requested_field_addr));
1320 }
1321 };
1322
1323 // Print the fields of instanceOops, or the elements of arrayOops
1324 static void log_oop_details(ArchiveHeapInfo* heap_info, oop source_oop, address buffered_addr) {
1325 LogStreamHandle(Trace, cds, map, oops) st;
1326 if (st.is_enabled()) {
1327 Klass* source_klass = source_oop->klass();
1328 ArchiveBuilder* builder = ArchiveBuilder::current();
1329 Klass* requested_klass = builder->to_requested(builder->get_buffered_addr(source_klass));
1330
1331 st.print(" - klass: ");
1332 source_klass->print_value_on(&st);
1333 st.print(" " PTR_FORMAT, p2i(requested_klass));
1334 st.cr();
1335
1336 if (source_oop->is_typeArray()) {
1337 TypeArrayKlass::cast(source_klass)->oop_print_elements_on(typeArrayOop(source_oop), &st);
1338 } else if (source_oop->is_objArray()) {
1339 objArrayOop source_obj_array = objArrayOop(source_oop);
1340 for (int i = 0; i < source_obj_array->length(); i++) {
1341 st.print(" -%4d: ", i);
1342 oop obj = source_obj_array->obj_at(i);
1343 if (java_lang_Class::is_instance(obj)) {
1344 obj = HeapShared::scratch_java_mirror(obj);
1345 }
1346 print_oop_info_cr(&st, obj);
1347 }
1348 } else {
1349 st.print_cr(" - fields (%zu words):", source_oop->size());
1350 ArchivedFieldPrinter print_field(heap_info, &st, source_oop, buffered_addr);
1351 InstanceKlass::cast(source_klass)->print_nonstatic_fields(&print_field);
1352
1353 if (java_lang_Class::is_instance(source_oop)) {
1354 oop scratch_mirror = source_oop;
1355 st.print(" - signature: ");
1356 print_class_signature_for_mirror(&st, scratch_mirror);
1357 st.cr();
1358
1359 Klass* src_klass = java_lang_Class::as_Klass(scratch_mirror);
1360 if (src_klass != nullptr && src_klass->is_instance_klass()) {
1361 oop rr = HeapShared::scratch_resolved_references(InstanceKlass::cast(src_klass)->constants());
1362 st.print(" - archived_resolved_references: ");
1363 print_oop_info_cr(&st, rr);
1364
1365 // We need to print the fields in the scratch_mirror, not the original mirror.
1366 // (if a class is not aot-initialized, static fields in its scratch mirror will be cleared).
1367 assert(scratch_mirror == HeapShared::scratch_java_mirror(src_klass->java_mirror()), "sanity");
1368 st.print_cr("- ---- static fields (%d):", java_lang_Class::static_oop_field_count(scratch_mirror));
1369 InstanceKlass::cast(src_klass)->do_local_static_fields(&print_field);
1370 }
1371 }
1372 }
1373 }
1374 }
1375
1376 static void print_class_signature_for_mirror(outputStream* st, oop scratch_mirror) {
1377 assert(java_lang_Class::is_instance(scratch_mirror), "sanity");
1378 if (java_lang_Class::is_primitive(scratch_mirror)) {
1379 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
1380 BasicType bt = (BasicType)i;
1381 if (!is_reference_type(bt) && scratch_mirror == HeapShared::scratch_java_mirror(bt)) {
1382 oop orig_mirror = Universe::java_mirror(bt);
1383 java_lang_Class::print_signature(orig_mirror, st);
1384 return;
1385 }
1386 }
1387 ShouldNotReachHere();
1388 }
1389 java_lang_Class::print_signature(scratch_mirror, st);
1390 }
1391
1392 static void log_heap_roots() {
1393 LogStreamHandle(Trace, cds, map, oops) st;
1394 if (st.is_enabled()) {
1395 for (int i = 0; i < HeapShared::pending_roots()->length(); i++) {
1396 st.print("roots[%4d]: ", i);
1397 print_oop_info_cr(&st, HeapShared::pending_roots()->at(i));
1398 }
1399 }
1400 }
1401
1402 // Example output:
1403 // - The first number is the requested address (if print_requested_addr == true)
1404 // - The second number is the narrowOop version of the requested address (if UseCompressedOops == true)
1405 // 0x00000007ffc7e840 (0xfff8fd08) java.lang.Class Ljava/util/Array;
1406 // 0x00000007ffc000f8 (0xfff8001f) [B length: 11
1407 static void print_oop_info_cr(outputStream* st, oop source_oop, bool print_requested_addr = true) {
1408 if (source_oop == nullptr) {
1409 st->print_cr("null");
1410 } else {
1411 ResourceMark rm;
1412 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(source_oop);
1413 if (print_requested_addr) {
1414 st->print(PTR_FORMAT " ", p2i(requested_obj));
1415 }
1416 if (UseCompressedOops) {
1417 st->print("(0x%08x) ", CompressedOops::narrow_oop_value(requested_obj));
1418 }
1419 if (source_oop->is_array()) {
1420 int array_len = arrayOop(source_oop)->length();
1421 st->print_cr("%s length: %d", source_oop->klass()->external_name(), array_len);
1422 } else {
1423 st->print("%s", source_oop->klass()->external_name());
1424
1425 if (java_lang_String::is_instance(source_oop)) {
1426 st->print(" ");
1427 java_lang_String::print(source_oop, st);
1428 } else if (java_lang_Class::is_instance(source_oop)) {
1429 oop scratch_mirror = source_oop;
1430
1431 st->print(" ");
1432 print_class_signature_for_mirror(st, scratch_mirror);
1433
1434 Klass* src_klass = java_lang_Class::as_Klass(scratch_mirror);
1435 if (src_klass != nullptr && src_klass->is_instance_klass()) {
1436 InstanceKlass* buffered_klass =
1437 ArchiveBuilder::current()->get_buffered_addr(InstanceKlass::cast(src_klass));
1438 if (buffered_klass->has_aot_initialized_mirror()) {
1439 st->print(" (aot-inited)");
1440 }
1441 }
1442 }
1443 st->cr();
1444 }
1445 }
1446 }
1447 #endif // INCLUDE_CDS_JAVA_HEAP
1448
1449 // Log all the data [base...top). Pretend that the base address
1450 // will be mapped to requested_base at run-time.
1451 static void log_as_hex(address base, address top, address requested_base, bool is_heap = false) {
1452 assert(top >= base, "must be");
1453
1454 LogStreamHandle(Trace, cds, map) lsh;
1455 if (lsh.is_enabled()) {
1456 int unitsize = sizeof(address);
1457 if (is_heap && UseCompressedOops) {
1458 // This makes the compressed oop pointers easier to read, but
1459 // longs and doubles will be split into two words.
1460 unitsize = sizeof(narrowOop);
1461 }
1462 os::print_hex_dump(&lsh, base, top, unitsize, /* print_ascii=*/true, /* bytes_per_line=*/32, requested_base);
1463 }
1464 }
1465
1466 static void log_header(FileMapInfo* mapinfo) {
1467 LogStreamHandle(Info, cds, map) lsh;
1468 if (lsh.is_enabled()) {
1469 mapinfo->print(&lsh);
1470 }
1471 }
1472
1473 public:
1474 static void log(ArchiveBuilder* builder, FileMapInfo* mapinfo,
1475 ArchiveHeapInfo* heap_info,
1476 char* bitmap, size_t bitmap_size_in_bytes) {
1477 log_info(cds, map)("%s CDS archive map for %s", CDSConfig::is_dumping_static_archive() ? "Static" : "Dynamic", mapinfo->full_path());
1478
1479 address header = address(mapinfo->header());
1480 address header_end = header + mapinfo->header()->header_size();
1481 log_region("header", header, header_end, nullptr);
1482 log_header(mapinfo);
1483 log_as_hex(header, header_end, nullptr);
1484
1485 DumpRegion* rw_region = &builder->_rw_region;
1486 DumpRegion* ro_region = &builder->_ro_region;
1487
1488 log_metaspace_region("rw region", rw_region, &builder->_rw_src_objs);
1489 log_metaspace_region("ro region", ro_region, &builder->_ro_src_objs);
1490
1491 address bitmap_end = address(bitmap + bitmap_size_in_bytes);
1492 log_region("bitmap", address(bitmap), bitmap_end, nullptr);
1493 log_as_hex((address)bitmap, bitmap_end, nullptr);
1494
1495 #if INCLUDE_CDS_JAVA_HEAP
1496 if (heap_info->is_used()) {
1497 log_heap_region(heap_info);
1498 }
1499 #endif
1500
1501 log_info(cds, map)("[End of CDS archive map]");
1502 }
1503 }; // end ArchiveBuilder::CDSMapLogger
1504
1505 void ArchiveBuilder::print_stats() {
1506 _alloc_stats.print_stats(int(_ro_region.used()), int(_rw_region.used()));
1507 }
1508
1509 void ArchiveBuilder::write_archive(FileMapInfo* mapinfo, ArchiveHeapInfo* heap_info) {
1510 // Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
1511 // MetaspaceShared::n_regions (internal to hotspot).
1512 assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
1513
1514 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1515 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1516
1517 // Split pointer map into read-write and read-only bitmaps
1518 ArchivePtrMarker::initialize_rw_ro_maps(&_rw_ptrmap, &_ro_ptrmap);
1519
1520 size_t bitmap_size_in_bytes;
1521 char* bitmap = mapinfo->write_bitmap_region(ArchivePtrMarker::rw_ptrmap(), ArchivePtrMarker::ro_ptrmap(), heap_info,
1522 bitmap_size_in_bytes);
1523
1524 if (heap_info->is_used()) {
1525 _total_heap_region_size = mapinfo->write_heap_region(heap_info);
1526 }
1527
1528 print_region_stats(mapinfo, heap_info);
1529
1530 mapinfo->set_requested_base((char*)MetaspaceShared::requested_base_address());
1531 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1532 // After this point, we should not write any data into mapinfo->header() since this
1533 // would corrupt its checksum we have calculated before.
1534 mapinfo->write_header();
1535 mapinfo->close();
1536
1537 if (log_is_enabled(Info, cds)) {
1538 print_stats();
1539 }
1540
1541 if (log_is_enabled(Info, cds, map)) {
1542 CDSMapLogger::log(this, mapinfo, heap_info,
1543 bitmap, bitmap_size_in_bytes);
1544 }
1545 CDS_JAVA_HEAP_ONLY(HeapShared::destroy_archived_object_cache());
1546 FREE_C_HEAP_ARRAY(char, bitmap);
1547 }
1548
1549 void ArchiveBuilder::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only, bool allow_exec) {
1550 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1551 }
1552
1553 void ArchiveBuilder::print_region_stats(FileMapInfo *mapinfo, ArchiveHeapInfo* heap_info) {
1554 // Print statistics of all the regions
1555 const size_t bitmap_used = mapinfo->region_at(MetaspaceShared::bm)->used();
1556 const size_t bitmap_reserved = mapinfo->region_at(MetaspaceShared::bm)->used_aligned();
1557 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1558 bitmap_reserved +
1559 _total_heap_region_size;
1560 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1561 bitmap_used +
1562 _total_heap_region_size;
1563 const double total_u_perc = percent_of(total_bytes, total_reserved);
1564
1565 _rw_region.print(total_reserved);
1566 _ro_region.print(total_reserved);
1567
1568 print_bitmap_region_stats(bitmap_used, total_reserved);
1569
1570 if (heap_info->is_used()) {
1571 print_heap_region_stats(heap_info, total_reserved);
1572 }
1573
1574 log_debug(cds)("total : %9zu [100.0%% of total] out of %9zu bytes [%5.1f%% used]",
1575 total_bytes, total_reserved, total_u_perc);
1576 }
1577
1578 void ArchiveBuilder::print_bitmap_region_stats(size_t size, size_t total_size) {
1579 log_debug(cds)("bm space: %9zu [ %4.1f%% of total] out of %9zu bytes [100.0%% used]",
1580 size, size/double(total_size)*100.0, size);
1581 }
1582
1583 void ArchiveBuilder::print_heap_region_stats(ArchiveHeapInfo *info, size_t total_size) {
1584 char* start = info->buffer_start();
1585 size_t size = info->buffer_byte_size();
1586 char* top = start + size;
1587 log_debug(cds)("hp space: %9zu [ %4.1f%% of total] out of %9zu bytes [100.0%% used] at " INTPTR_FORMAT,
1588 size, size/double(total_size)*100.0, size, p2i(start));
1589 }
1590
1591 void ArchiveBuilder::report_out_of_space(const char* name, size_t needed_bytes) {
1592 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
1593 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
1594 // or so.
1595 _rw_region.print_out_of_space_msg(name, needed_bytes);
1596 _ro_region.print_out_of_space_msg(name, needed_bytes);
1597
1598 log_error(cds)("Unable to allocate from '%s' region: Please reduce the number of shared classes.", name);
1599 MetaspaceShared::unrecoverable_writing_error();
1600 }