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/archiveBuilder.hpp"
27 #include "cds/archiveHeapWriter.hpp"
28 #include "cds/archiveUtils.hpp"
29 #include "cds/cdsConfig.hpp"
30 #include "cds/classPrelinker.hpp"
31 #include "cds/classPreloader.hpp"
32 #include "cds/cppVtables.hpp"
33 #include "cds/dumpAllocStats.hpp"
34 #include "cds/dynamicArchive.hpp"
35 #include "cds/finalImageRecipes.hpp"
36 #include "cds/heapShared.hpp"
37 #include "cds/metaspaceShared.hpp"
38 #include "cds/regeneratedClasses.hpp"
39 #include "classfile/classLoader.hpp"
40 #include "classfile/classLoaderDataShared.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 "oops/trainingData.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 _last_verified_top(nullptr),
157 _num_dump_regions_used(0),
158 _other_region_used_bytes(0),
159 _requested_static_archive_bottom(nullptr),
160 _requested_static_archive_top(nullptr),
161 _requested_dynamic_archive_bottom(nullptr),
162 _requested_dynamic_archive_top(nullptr),
163 _mapped_static_archive_bottom(nullptr),
164 _mapped_static_archive_top(nullptr),
165 _buffer_to_requested_delta(0),
166 _rw_region("rw", MAX_SHARED_DELTA),
167 _ro_region("ro", MAX_SHARED_DELTA),
168 _cc_region("cc", MAX_SHARED_DELTA),
169 _ptrmap(mtClassShared),
170 _rw_ptrmap(mtClassShared),
171 _ro_ptrmap(mtClassShared),
172 _cc_ptrmap(mtClassShared),
173 _rw_src_objs(),
174 _ro_src_objs(),
175 _src_obj_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
176 _buffered_to_src_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
177 _total_heap_region_size(0),
178 _estimated_metaspaceobj_bytes(0),
179 _estimated_hashtable_bytes(0)
180 {
181 _klasses = new (mtClassShared) GrowableArray<Klass*>(4 * K, mtClassShared);
182 _symbols = new (mtClassShared) GrowableArray<Symbol*>(256 * K, mtClassShared);
183 _entropy_seed = 0x12345678;
184 assert(_current == nullptr, "must be");
185 _current = this;
186 }
187
188 ArchiveBuilder::~ArchiveBuilder() {
189 assert(_current == this, "must be");
190 _current = nullptr;
191
192 for (int i = 0; i < _symbols->length(); i++) {
193 _symbols->at(i)->decrement_refcount();
194 }
195
196 delete _klasses;
197 delete _symbols;
198 if (_shared_rs.is_reserved()) {
199 _shared_rs.release();
200 }
201 }
202
203 // Returns a deterministic sequence of pseudo random numbers. The main purpose is NOT
204 // for randomness but to get good entropy for the identity_hash() of archived Symbols,
205 // while keeping the contents of static CDS archives deterministic to ensure
206 // reproducibility of JDK builds.
207 int ArchiveBuilder::entropy() {
208 assert(SafepointSynchronize::is_at_safepoint(), "needed to ensure deterministic sequence");
209 _entropy_seed = os::next_random(_entropy_seed);
210 return static_cast<int>(_entropy_seed);
211 }
212
213 class GatherKlassesAndSymbols : public UniqueMetaspaceClosure {
214 ArchiveBuilder* _builder;
215
216 public:
217 GatherKlassesAndSymbols(ArchiveBuilder* builder) : _builder(builder) {}
218
219 virtual bool do_unique_ref(Ref* ref, bool read_only) {
220 return _builder->gather_klass_and_symbol(ref, read_only);
221 }
222 };
223
224 bool ArchiveBuilder::gather_klass_and_symbol(MetaspaceClosure::Ref* ref, bool read_only) {
225 if (ref->obj() == nullptr) {
226 return false;
227 }
228 if (get_follow_mode(ref) != make_a_copy) {
229 return false;
230 }
231 if (ref->msotype() == MetaspaceObj::ClassType) {
232 Klass* klass = (Klass*)ref->obj();
233 assert(klass->is_klass(), "must be");
234 if (!is_excluded(klass)) {
235 _klasses->append(klass);
236 if (klass->is_hidden() && klass->is_instance_klass()) {
237 update_hidden_class_loader_type(InstanceKlass::cast(klass));
238 }
239 }
240 // See RunTimeClassInfo::get_for()
241 _estimated_metaspaceobj_bytes += align_up(BytesPerWord, 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
297 #if INCLUDE_CDS_JAVA_HEAP
298
299 void ArchiveBuilder::update_hidden_class_loader_type(InstanceKlass* ik) {
300 s2 classloader_type;
301 if (HeapShared::is_lambda_form_klass(ik)) {
302 assert(CDSConfig::is_dumping_invokedynamic(), "lambda form classes are archived only if ArchiveInvokeDynamic is true");
303 classloader_type = ClassLoader::BOOT_LOADER;
304 } else if (HeapShared::is_lambda_proxy_klass(ik)) {
305 oop loader = ik->class_loader();
306
307 if (loader == nullptr) {
308 classloader_type = ClassLoader::BOOT_LOADER;
309 } else if (SystemDictionary::is_platform_class_loader(loader)) {
310 classloader_type = ClassLoader::PLATFORM_LOADER;
311 } else if (SystemDictionary::is_system_class_loader(loader)) {
312 classloader_type = ClassLoader::APP_LOADER;
313 } else {
314 ShouldNotReachHere();
315 }
316 } else {
317 ShouldNotReachHere();
318 }
319
320 ik->set_shared_class_loader_type(classloader_type);
321 if (HeapShared::is_lambda_proxy_klass(ik)) {
322 InstanceKlass* nest_host = ik->nest_host_not_null();
323 ik->set_shared_classpath_index(nest_host->shared_classpath_index());
324 }
325 }
326
327 #endif //INCLUDE_CDS_JAVA_HEAP
328
329 int ArchiveBuilder::compare_symbols_by_address(Symbol** a, Symbol** b) {
330 if (a[0] < b[0]) {
331 return -1;
332 } else {
333 assert(a[0] > b[0], "Duplicated symbol %s unexpected", (*a)->as_C_string());
334 return 1;
335 }
336 }
337
338 int ArchiveBuilder::compare_klass_by_name(Klass** a, Klass** b) {
339 return a[0]->name()->fast_compare(b[0]->name());
340 }
341
342 void ArchiveBuilder::sort_klasses() {
343 log_info(cds)("Sorting classes ... ");
344 _klasses->sort(compare_klass_by_name);
345 }
346
347 size_t ArchiveBuilder::estimate_archive_size() {
348 // size of the symbol table and two dictionaries, plus the RunTimeClassInfo's
349 size_t symbol_table_est = SymbolTable::estimate_size_for_archive();
350 size_t dictionary_est = SystemDictionaryShared::estimate_size_for_archive();
351 size_t training_data_est = TrainingData::estimate_size_for_archive();
352 _estimated_hashtable_bytes = symbol_table_est + dictionary_est + training_data_est;
353
354 if (CDSConfig::is_dumping_final_static_archive()) {
355 _estimated_hashtable_bytes += 200 * 1024 * 1024; // FIXME -- need to iterate archived symbols??
356 }
357
358 if (CDSConfig::is_dumping_dynamic_archive()) {
359 // Some extra space for traning data. Be generous. Unused areas will be trimmed from the archive file.
360 _estimated_hashtable_bytes += 200 * 1024 * 1024;
361 }
362 size_t total = 0;
363
364 total += _estimated_metaspaceobj_bytes;
365 total += _estimated_hashtable_bytes;
366
367 // allow fragmentation at the end of each dump region
368 total += _total_dump_regions * MetaspaceShared::core_region_alignment();
369
370 log_info(cds)("_estimated_hashtable_bytes = " SIZE_FORMAT " + " SIZE_FORMAT " = " SIZE_FORMAT,
371 symbol_table_est, dictionary_est, _estimated_hashtable_bytes);
372 log_info(cds)("_estimated_metaspaceobj_bytes = " SIZE_FORMAT, _estimated_metaspaceobj_bytes);
373 log_info(cds)("total estimate bytes = " SIZE_FORMAT, total);
374
375 return align_up(total, MetaspaceShared::core_region_alignment());
376 }
377
378 address ArchiveBuilder::reserve_buffer() {
379 size_t buffer_size = estimate_archive_size();
380 ReservedSpace rs(buffer_size, MetaspaceShared::core_region_alignment(), os::vm_page_size());
381 if (!rs.is_reserved()) {
382 log_error(cds)("Failed to reserve " SIZE_FORMAT " bytes of output buffer.", buffer_size);
383 MetaspaceShared::unrecoverable_writing_error();
384 }
385
386 // buffer_bottom is the lowest address of the 2 core regions (rw, ro) when
387 // we are copying the class metadata into the buffer.
388 address buffer_bottom = (address)rs.base();
389 log_info(cds)("Reserved output buffer space at " PTR_FORMAT " [" SIZE_FORMAT " bytes]",
390 p2i(buffer_bottom), buffer_size);
391 _shared_rs = rs;
392
393 _buffer_bottom = buffer_bottom;
394 _last_verified_top = buffer_bottom;
395 _current_dump_region = &_rw_region;
396 _num_dump_regions_used = 1;
397 _other_region_used_bytes = 0;
398 _current_dump_region->init(&_shared_rs, &_shared_vs);
399
400 ArchivePtrMarker::initialize(&_ptrmap, &_shared_vs);
401
402 // The bottom of the static archive should be mapped at this address by default.
403 _requested_static_archive_bottom = (address)MetaspaceShared::requested_base_address();
404
405 // The bottom of the archive (that I am writing now) should be mapped at this address by default.
406 address my_archive_requested_bottom;
407
408 if (CDSConfig::is_dumping_static_archive()) {
409 my_archive_requested_bottom = _requested_static_archive_bottom;
410 } else {
411 _mapped_static_archive_bottom = (address)MetaspaceObj::shared_metaspace_base();
412 _mapped_static_archive_top = (address)MetaspaceObj::shared_metaspace_top();
413 assert(_mapped_static_archive_top >= _mapped_static_archive_bottom, "must be");
414 size_t static_archive_size = _mapped_static_archive_top - _mapped_static_archive_bottom;
415
416 // At run time, we will mmap the dynamic archive at my_archive_requested_bottom
417 _requested_static_archive_top = _requested_static_archive_bottom + static_archive_size;
418 my_archive_requested_bottom = align_up(_requested_static_archive_top, MetaspaceShared::core_region_alignment());
419
420 _requested_dynamic_archive_bottom = my_archive_requested_bottom;
421 }
422
423 _buffer_to_requested_delta = my_archive_requested_bottom - _buffer_bottom;
424
425 address my_archive_requested_top = my_archive_requested_bottom + buffer_size;
426 if (my_archive_requested_bottom < _requested_static_archive_bottom ||
427 my_archive_requested_top <= _requested_static_archive_bottom) {
428 // Size overflow.
429 log_error(cds)("my_archive_requested_bottom = " INTPTR_FORMAT, p2i(my_archive_requested_bottom));
430 log_error(cds)("my_archive_requested_top = " INTPTR_FORMAT, p2i(my_archive_requested_top));
431 log_error(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is too high. "
432 "Please rerun java -Xshare:dump with a lower value", p2i(_requested_static_archive_bottom));
433 MetaspaceShared::unrecoverable_writing_error();
434 }
435
436 if (CDSConfig::is_dumping_static_archive()) {
437 // We don't want any valid object to be at the very bottom of the archive.
438 // See ArchivePtrMarker::mark_pointer().
439 rw_region()->allocate(16);
440 }
441
442 return buffer_bottom;
443 }
444
445 void ArchiveBuilder::iterate_sorted_roots(MetaspaceClosure* it) {
446 int num_symbols = _symbols->length();
447 for (int i = 0; i < num_symbols; i++) {
448 it->push(_symbols->adr_at(i));
449 }
450
451 int num_klasses = _klasses->length();
452 for (int i = 0; i < num_klasses; i++) {
453 it->push(_klasses->adr_at(i));
454 }
455
456 iterate_roots(it);
457 }
458
459 class GatherSortedSourceObjs : public MetaspaceClosure {
460 ArchiveBuilder* _builder;
461
462 public:
463 GatherSortedSourceObjs(ArchiveBuilder* builder) : _builder(builder) {}
464
465 virtual bool do_ref(Ref* ref, bool read_only) {
466 return _builder->gather_one_source_obj(ref, read_only);
467 }
468 };
469
470 bool ArchiveBuilder::gather_one_source_obj(MetaspaceClosure::Ref* ref, bool read_only) {
471 address src_obj = ref->obj();
472 if (src_obj == nullptr) {
473 return false;
474 }
475
476 remember_embedded_pointer_in_enclosing_obj(ref);
477 if (RegeneratedClasses::has_been_regenerated(src_obj)) {
478 // No need to copy it. We will later relocate it to point to the regenerated klass/method.
479 return false;
480 }
481
482 FollowMode follow_mode = get_follow_mode(ref);
483 SourceObjInfo src_info(ref, read_only, follow_mode);
484 bool created;
485 SourceObjInfo* p = _src_obj_table.put_if_absent(src_obj, src_info, &created);
486 if (created) {
487 if (_src_obj_table.maybe_grow()) {
488 log_info(cds, hashtables)("Expanded _src_obj_table table to %d", _src_obj_table.table_size());
489 }
490 }
491
492 #ifdef ASSERT
493 if (ref->msotype() == MetaspaceObj::MethodType) {
494 Method* m = (Method*)ref->obj();
495 assert(!RegeneratedClasses::has_been_regenerated((address)m->method_holder()),
496 "Should not archive methods in a class that has been regenerated");
497 }
498 #endif
499
500 assert(p->read_only() == src_info.read_only(), "must be");
501
502 if (created && src_info.should_copy()) {
503 if (read_only) {
504 _ro_src_objs.append(p);
505 } else {
506 _rw_src_objs.append(p);
507 }
508 return true; // Need to recurse into this ref only if we are copying it
509 } else {
510 return false;
511 }
512 }
513
514 void ArchiveBuilder::record_regenerated_object(address orig_src_obj, address regen_src_obj) {
515 // Record the fact that orig_src_obj has been replaced by regen_src_obj. All calls to get_buffered_addr(orig_src_obj)
516 // should return the same value as get_buffered_addr(regen_src_obj).
517 SourceObjInfo* p = _src_obj_table.get(regen_src_obj);
518 assert(p != nullptr, "regenerated object should always be dumped");
519 SourceObjInfo orig_src_info(orig_src_obj, p);
520 bool created;
521 _src_obj_table.put_if_absent(orig_src_obj, orig_src_info, &created);
522 assert(created, "We shouldn't have archived the original copy of a regenerated object");
523 }
524
525 // Remember that we have a pointer inside ref->enclosing_obj() that points to ref->obj()
526 void ArchiveBuilder::remember_embedded_pointer_in_enclosing_obj(MetaspaceClosure::Ref* ref) {
527 assert(ref->obj() != nullptr, "should have checked");
528
529 address enclosing_obj = ref->enclosing_obj();
530 if (enclosing_obj == nullptr) {
531 return;
532 }
533
534 // We are dealing with 3 addresses:
535 // address o = ref->obj(): We have found an object whose address is o.
536 // address* mpp = ref->mpp(): The object o is pointed to by a pointer whose address is mpp.
537 // I.e., (*mpp == o)
538 // enclosing_obj : If non-null, it is the object which has a field that points to o.
539 // mpp is the address if that field.
540 //
541 // Example: We have an array whose first element points to a Method:
542 // Method* o = 0x0000abcd;
543 // Array<Method*>* enclosing_obj = 0x00001000;
544 // enclosing_obj->at_put(0, o);
545 //
546 // We the MetaspaceClosure iterates on the very first element of this array, we have
547 // ref->obj() == 0x0000abcd (the Method)
548 // ref->mpp() == 0x00001008 (the location of the first element in the array)
549 // ref->enclosing_obj() == 0x00001000 (the Array that contains the Method)
550 //
551 // We use the above information to mark the bitmap to indicate that there's a pointer on address 0x00001008.
552 SourceObjInfo* src_info = _src_obj_table.get(enclosing_obj);
553 if (src_info == nullptr || !src_info->should_copy()) {
554 // source objects of point_to_it/set_to_null types are not copied
555 // so we don't need to remember their pointers.
556 } else {
557 if (src_info->read_only()) {
558 _ro_src_objs.remember_embedded_pointer(src_info, ref);
559 } else {
560 _rw_src_objs.remember_embedded_pointer(src_info, ref);
561 }
562 }
563 }
564
565 void ArchiveBuilder::gather_source_objs() {
566 ResourceMark rm;
567 log_info(cds)("Gathering all archivable objects ... ");
568 gather_klasses_and_symbols();
569 GatherSortedSourceObjs doit(this);
570 iterate_sorted_roots(&doit);
571 doit.finish();
572 }
573
574 bool ArchiveBuilder::is_excluded(Klass* klass) {
575 if (klass->is_instance_klass()) {
576 InstanceKlass* ik = InstanceKlass::cast(klass);
577 return SystemDictionaryShared::is_excluded_class(ik);
578 } else if (klass->is_objArray_klass()) {
579 Klass* bottom = ObjArrayKlass::cast(klass)->bottom_klass();
580 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_shared_static(bottom)) {
581 // The bottom class is in the static archive so it's clearly not excluded.
582 assert(CDSConfig::is_dumping_dynamic_archive(), "sanity");
583 return false;
584 } else if (bottom->is_instance_klass()) {
585 return SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(bottom));
586 }
587 }
588
589 return false;
590 }
591
592 ArchiveBuilder::FollowMode ArchiveBuilder::get_follow_mode(MetaspaceClosure::Ref *ref) {
593 address obj = ref->obj();
594 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_in_shared_metaspace(obj)) {
595 // Don't dump existing shared metadata again.
596 return point_to_it;
597 } else if (ref->msotype() == MetaspaceObj::MethodDataType ||
598 ref->msotype() == MetaspaceObj::MethodCountersType ||
599 ref->msotype() == MetaspaceObj::KlassTrainingDataType ||
600 ref->msotype() == MetaspaceObj::MethodTrainingDataType ||
601 ref->msotype() == MetaspaceObj::CompileTrainingDataType) {
602 return TrainingData::need_data() ? make_a_copy : set_to_null;
603 } else {
604 if (ref->msotype() == MetaspaceObj::ClassType) {
605 Klass* klass = (Klass*)ref->obj();
606 assert(klass->is_klass(), "must be");
607 if (is_excluded(klass)) {
608 ResourceMark rm;
609 log_debug(cds, dynamic)("Skipping class (excluded): %s", klass->external_name());
610 return set_to_null;
611 }
612 }
613
614 return make_a_copy;
615 }
616 }
617
618 void ArchiveBuilder::start_dump_region(DumpRegion* next) {
619 address bottom = _last_verified_top;
620 address top = (address)(current_dump_region()->top());
621 _other_region_used_bytes += size_t(top - bottom);
622
623 current_dump_region()->pack(next);
624 _current_dump_region = next;
625 _num_dump_regions_used ++;
626
627 _last_verified_top = (address)(current_dump_region()->top());
628 }
629
630 void ArchiveBuilder::verify_estimate_size(size_t estimate, const char* which) {
631 address bottom = _last_verified_top;
632 address top = (address)(current_dump_region()->top());
633 size_t used = size_t(top - bottom) + _other_region_used_bytes;
634 int diff = int(estimate) - int(used);
635
636 log_info(cds)("%s estimate = " SIZE_FORMAT " used = " SIZE_FORMAT "; diff = %d bytes", which, estimate, used, diff);
637 assert(diff >= 0, "Estimate is too small");
638
639 _last_verified_top = top;
640 _other_region_used_bytes = 0;
641 }
642
643 char* ArchiveBuilder::ro_strdup(const char* s) {
644 char* archived_str = ro_region_alloc((int)strlen(s) + 1);
645 strcpy(archived_str, s);
646 return archived_str;
647 }
648
649 // The objects that have embedded pointers will sink
650 // towards the end of the list. This ensures we have a maximum
651 // number of leading zero bits in the relocation bitmap.
652 int ArchiveBuilder::compare_src_objs(SourceObjInfo** a, SourceObjInfo** b) {
653 if ((*a)->has_embedded_pointer() && !(*b)->has_embedded_pointer()) {
654 return 1;
655 } else if (!(*a)->has_embedded_pointer() && (*b)->has_embedded_pointer()) {
656 return -1;
657 } else {
658 // This is necessary to keep the sorting order stable. Otherwise the
659 // archive's contents may not be deterministic.
660 return (*a)->id() - (*b)->id();
661 }
662 }
663
664 void ArchiveBuilder::sort_metadata_objs() {
665 _rw_src_objs.objs()->sort(compare_src_objs);
666 _ro_src_objs.objs()->sort(compare_src_objs);
667 }
668
669 void ArchiveBuilder::dump_rw_metadata() {
670 ResourceMark rm;
671 log_info(cds)("Allocating RW objects ... ");
672 make_shallow_copies(&_rw_region, &_rw_src_objs);
673
674 #if INCLUDE_CDS_JAVA_HEAP
675 if (CDSConfig::is_dumping_full_module_graph()) {
676 // Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
677 char* start = rw_region()->top();
678 ClassLoaderDataShared::allocate_archived_tables();
679 alloc_stats()->record_modules(rw_region()->top() - start, /*read_only*/false);
680 }
681 #endif
682 }
683
684 void ArchiveBuilder::dump_ro_metadata() {
685 ResourceMark rm;
686 log_info(cds)("Allocating RO objects ... ");
687
688 start_dump_region(&_ro_region);
689 make_shallow_copies(&_ro_region, &_ro_src_objs);
690
691 #if INCLUDE_CDS_JAVA_HEAP
692 if (CDSConfig::is_dumping_full_module_graph()) {
693 char* start = ro_region()->top();
694 ClassLoaderDataShared::init_archived_tables();
695 alloc_stats()->record_modules(ro_region()->top() - start, /*read_only*/true);
696 }
697 #endif
698
699 RegeneratedClasses::record_regenerated_objects();
700 }
701
702 void ArchiveBuilder::make_shallow_copies(DumpRegion *dump_region,
703 const ArchiveBuilder::SourceObjList* src_objs) {
704 for (int i = 0; i < src_objs->objs()->length(); i++) {
705 make_shallow_copy(dump_region, src_objs->objs()->at(i));
706 }
707 log_info(cds)("done (%d objects)", src_objs->objs()->length());
708 }
709
710 void ArchiveBuilder::make_shallow_copy(DumpRegion *dump_region, SourceObjInfo* src_info) {
711 address src = src_info->source_addr();
712 int bytes = src_info->size_in_bytes();
713 char* dest;
714 char* oldtop;
715 char* newtop;
716
717 oldtop = dump_region->top();
718 if (src_info->msotype() == MetaspaceObj::ClassType) {
719 // Save a pointer immediate in front of an InstanceKlass, so
720 // we can do a quick lookup from InstanceKlass* -> RunTimeClassInfo*
721 // without building another hashtable. See RunTimeClassInfo::get_for()
722 // in systemDictionaryShared.cpp.
723 Klass* klass = (Klass*)src;
724 if (klass->is_instance_klass()) {
725 SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
726 dump_region->allocate(sizeof(address));
727 }
728 }
729 dest = dump_region->allocate(bytes);
730 newtop = dump_region->top();
731
732 memcpy(dest, src, bytes);
733
734 // Update the hash of buffered sorted symbols for static dump so that the symbols have deterministic contents
735 if (CDSConfig::is_dumping_static_archive() && (src_info->msotype() == MetaspaceObj::SymbolType)) {
736 Symbol* buffered_symbol = (Symbol*)dest;
737 assert(((Symbol*)src)->is_permanent(), "archived symbols must be permanent");
738 buffered_symbol->update_identity_hash();
739 }
740
741 {
742 bool created;
743 _buffered_to_src_table.put_if_absent((address)dest, src, &created);
744 assert(created, "must be");
745 if (_buffered_to_src_table.maybe_grow()) {
746 log_info(cds, hashtables)("Expanded _buffered_to_src_table table to %d", _buffered_to_src_table.table_size());
747 }
748 }
749
750 intptr_t* archived_vtable = CppVtables::get_archived_vtable(src_info->msotype(), (address)dest);
751 if (archived_vtable != nullptr) {
752 *(address*)dest = (address)archived_vtable;
753 ArchivePtrMarker::mark_pointer((address*)dest);
754 }
755
756 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(src), p2i(dest), bytes);
757 src_info->set_buffered_addr((address)dest);
758
759 _alloc_stats.record(src_info->msotype(), int(newtop - oldtop), src_info->read_only());
760 }
761
762 // This is used by code that hand-assembles data structures, such as the LambdaProxyClassKey, that are
763 // not handled by MetaspaceClosure.
764 void ArchiveBuilder::write_pointer_in_buffer(address* ptr_location, address src_addr) {
765 assert(is_in_buffer_space(ptr_location), "must be");
766 if (src_addr == nullptr) {
767 *ptr_location = nullptr;
768 ArchivePtrMarker::clear_pointer(ptr_location);
769 } else {
770 *ptr_location = get_buffered_addr(src_addr);
771 ArchivePtrMarker::mark_pointer(ptr_location);
772 }
773 }
774
775 void ArchiveBuilder::mark_and_relocate_to_buffered_addr(address* ptr_location) {
776 assert(*ptr_location != nullptr, "sanity");
777 if (!is_in_mapped_static_archive(*ptr_location)) {
778 *ptr_location = get_buffered_addr(*ptr_location);
779 }
780 ArchivePtrMarker::mark_pointer(ptr_location);
781 }
782
783 address ArchiveBuilder::get_buffered_addr(address src_addr) const {
784 SourceObjInfo* p = _src_obj_table.get(src_addr);
785 assert(p != nullptr, "src_addr " INTPTR_FORMAT " is used but has not been archived",
786 p2i(src_addr));
787
788 return p->buffered_addr();
789 }
790
791 bool ArchiveBuilder::has_been_archived(address src_addr) const {
792 SourceObjInfo* p = _src_obj_table.get(src_addr);
793 return (p != nullptr);
794 }
795
796 address ArchiveBuilder::get_source_addr(address buffered_addr) const {
797 assert(is_in_buffer_space(buffered_addr), "must be");
798 address* src_p = _buffered_to_src_table.get(buffered_addr);
799 assert(src_p != nullptr && *src_p != nullptr, "must be");
800 return *src_p;
801 }
802
803 void ArchiveBuilder::relocate_embedded_pointers(ArchiveBuilder::SourceObjList* src_objs) {
804 for (int i = 0; i < src_objs->objs()->length(); i++) {
805 src_objs->relocate(i, this);
806 }
807 }
808
809 void ArchiveBuilder::relocate_metaspaceobj_embedded_pointers() {
810 log_info(cds)("Relocating embedded pointers in core regions ... ");
811 relocate_embedded_pointers(&_rw_src_objs);
812 relocate_embedded_pointers(&_ro_src_objs);
813 }
814
815 #define ADD_COUNT(x) \
816 x += 1; \
817 x ## _p += preloaded; \
818 x ## _i += inited;
819
820 #define DECLARE_INSTANCE_KLASS_COUNTER(x) \
821 int x = 0; \
822 int x ## _p = 0; \
823 int x ## _i = 0; \
824
825 void ArchiveBuilder::make_klasses_shareable() {
826 DECLARE_INSTANCE_KLASS_COUNTER(num_instance_klasses);
827 DECLARE_INSTANCE_KLASS_COUNTER(num_boot_klasses);
828 DECLARE_INSTANCE_KLASS_COUNTER(num_vm_klasses);
829 DECLARE_INSTANCE_KLASS_COUNTER(num_platform_klasses);
830 DECLARE_INSTANCE_KLASS_COUNTER(num_app_klasses);
831 DECLARE_INSTANCE_KLASS_COUNTER(num_hidden_klasses);
832 DECLARE_INSTANCE_KLASS_COUNTER(num_unlinked_klasses);
833 DECLARE_INSTANCE_KLASS_COUNTER(num_unregistered_klasses);
834 int num_obj_array_klasses = 0;
835 int num_type_array_klasses = 0;
836
837 int boot_unlinked = 0;
838 int platform_unlinked = 0;
839 int app_unlinked = 0;
840 int unreg_unlinked = 0;
841
842 for (int i = 0; i < klasses()->length(); i++) {
843 // Some of the code in ConstantPool::remove_unshareable_info() requires the classes
844 // to be in linked state, so it must be call here before the next loop, which returns
845 // all classes to unlinked state.
846 Klass* k = get_buffered_addr(klasses()->at(i));
847 if (k->is_instance_klass()) {
848 InstanceKlass::cast(k)->constants()->remove_unshareable_info();
849 }
850 }
851
852 for (int i = 0; i < klasses()->length(); i++) {
853 const char* type;
854 const char* unlinked = "";
855 const char* hidden = "";
856 const char* generated = "";
857 const char* preloaded_msg = "";
858 const char* inited_msg = "";
859 Klass* k = get_buffered_addr(klasses()->at(i));
860 k->remove_java_mirror();
861 if (k->is_objArray_klass()) {
862 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
863 // on their array classes.
864 num_obj_array_klasses ++;
865 type = "array";
866 } else if (k->is_typeArray_klass()) {
867 num_type_array_klasses ++;
868 type = "array";
869 k->remove_unshareable_info();
870 } else {
871 assert(k->is_instance_klass(), " must be");
872 InstanceKlass* ik = InstanceKlass::cast(k);
873 InstanceKlass* src_ik = get_source_addr(ik);
874 int preloaded = ClassPreloader::is_preloaded_class(src_ik);
875 int inited = ik->has_preinitialized_mirror();
876 ADD_COUNT(num_instance_klasses);
877 if (CDSConfig::is_dumping_dynamic_archive()) {
878 // For static dump, class loader type are already set.
879 ik->assign_class_loader_type();
880 }
881 if (ik->is_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 } else if (ik->is_shared_boot_class()) {
897 type = "boot";
898 ADD_COUNT(num_boot_klasses);
899 } else if (ik->is_shared_platform_class()) {
900 type = "plat";
901 ADD_COUNT(num_platform_klasses);
902 } else if (ik->is_shared_app_class()) {
903 type = "app";
904 ADD_COUNT(num_app_klasses);
905 } else {
906 assert(ik->is_shared_unregistered_class(), "must be");
907 type = "unreg";
908 ADD_COUNT(num_unregistered_klasses);
909 }
910
911 if (ClassPreloader::is_vm_class(src_ik)) {
912 ADD_COUNT(num_vm_klasses);
913 }
914
915 if (!ik->is_linked()) {
916 ADD_COUNT(num_unlinked_klasses);
917 unlinked = " unlinked";
918 if (ik->is_shared_boot_class()) {
919 boot_unlinked ++;
920 } else if (ik->is_shared_platform_class()) {
921 platform_unlinked ++;
922 } else if (ik->is_shared_app_class()) {
923 app_unlinked ++;
924 } else {
925 unreg_unlinked ++;
926 }
927 }
928
929 if (ik->is_hidden()) {
930 ADD_COUNT(num_hidden_klasses);
931 hidden = " hidden";
932 }
933
934 if (ik->is_generated_shared_class()) {
935 generated = " generated";
936 }
937 if (preloaded) {
938 preloaded_msg = " preloaded";
939 }
940 if (inited) {
941 inited_msg = " inited";
942 }
943
944 MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread::current(), ik);
945 ik->remove_unshareable_info();
946 }
947
948 if (log_is_enabled(Debug, cds, class)) {
949 ResourceMark rm;
950 log_debug(cds, class)("klasses[%5d] = " PTR_FORMAT " %-5s %s%s%s%s%s%s", i,
951 p2i(to_requested(k)), type, k->external_name(),
952 hidden, unlinked, generated, preloaded_msg, inited_msg);
953 }
954 }
955
956 #define STATS_FORMAT "= %5d, preloaded = %5d, inited = %5d"
957 #define STATS_PARAMS(x) num_ ## x, num_ ## x ## _p, num_ ## x ## _i
958
959 log_info(cds)("Number of classes %d", num_instance_klasses + num_obj_array_klasses + num_type_array_klasses);
960 log_info(cds)(" instance classes " STATS_FORMAT, STATS_PARAMS(instance_klasses));
961 log_info(cds)(" boot " STATS_FORMAT, STATS_PARAMS(boot_klasses));
962 log_info(cds)(" vm " STATS_FORMAT, STATS_PARAMS(vm_klasses));
963 log_info(cds)(" platform " STATS_FORMAT, STATS_PARAMS(platform_klasses));
964 log_info(cds)(" app " STATS_FORMAT, STATS_PARAMS(app_klasses));
965 log_info(cds)(" unregistered " STATS_FORMAT, STATS_PARAMS(unregistered_klasses));
966 log_info(cds)(" (hidden) " STATS_FORMAT, STATS_PARAMS(hidden_klasses));
967 log_info(cds)(" (unlinked) " STATS_FORMAT ", boot = %d, plat = %d, app = %d, unreg = %d",
968 STATS_PARAMS(unlinked_klasses),
969 boot_unlinked, platform_unlinked,
970 app_unlinked, unreg_unlinked);
971 log_info(cds)(" obj array classes = %5d", num_obj_array_klasses);
972 log_info(cds)(" type array classes = %5d", num_type_array_klasses);
973 log_info(cds)(" symbols = %5d", _symbols->length());
974
975 #undef STATS_FORMAT
976 #undef STATS_PARAMS
977
978 DynamicArchive::make_array_klasses_shareable();
979 }
980
981 void ArchiveBuilder::make_training_data_shareable() {
982 auto clean_td = [&] (address& src_obj, SourceObjInfo& info) {
983 if (!is_in_buffer_space(info.buffered_addr())) {
984 return;
985 }
986
987 if (info.msotype() == MetaspaceObj::KlassTrainingDataType ||
988 info.msotype() == MetaspaceObj::MethodTrainingDataType ||
989 info.msotype() == MetaspaceObj::CompileTrainingDataType) {
990 TrainingData* buffered_td = (TrainingData*)info.buffered_addr();
991 buffered_td->remove_unshareable_info();
992 } else if (info.msotype() == MetaspaceObj::MethodDataType) {
993 MethodData* buffered_mdo = (MethodData*)info.buffered_addr();
994 buffered_mdo->remove_unshareable_info();
995 } else if (info.msotype() == MetaspaceObj::MethodCountersType) {
996 MethodCounters* buffered_mc = (MethodCounters*)info.buffered_addr();
997 buffered_mc->remove_unshareable_info();
998 }
999 };
1000 _src_obj_table.iterate_all(clean_td);
1001 }
1002
1003 void ArchiveBuilder::serialize_dynamic_archivable_items(SerializeClosure* soc) {
1004 SymbolTable::serialize_shared_table_header(soc, false);
1005 SystemDictionaryShared::serialize_dictionary_headers(soc, false);
1006 DynamicArchive::serialize_array_klasses(soc);
1007 ClassPreloader::serialize(soc, false);
1008 FinalImageRecipes::serialize(soc, false);
1009 TrainingData::serialize_training_data(soc);
1010 }
1011
1012 uintx ArchiveBuilder::buffer_to_offset(address p) const {
1013 address requested_p = to_requested(p);
1014 assert(requested_p >= _requested_static_archive_bottom, "must be");
1015 return requested_p - _requested_static_archive_bottom;
1016 }
1017
1018 uintx ArchiveBuilder::any_to_offset(address p) const {
1019 if (is_in_mapped_static_archive(p)) {
1020 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1021 return p - _mapped_static_archive_bottom;
1022 }
1023 if (!is_in_buffer_space(p)) {
1024 // p must be a "source" address
1025 p = get_buffered_addr(p);
1026 }
1027 return buffer_to_offset(p);
1028 }
1029
1030 void ArchiveBuilder::start_cc_region() {
1031 ro_region()->pack();
1032 start_dump_region(&_cc_region);
1033 }
1034
1035 void ArchiveBuilder::end_cc_region() {
1036 _cc_region.pack();
1037 }
1038
1039 #if INCLUDE_CDS_JAVA_HEAP
1040 narrowKlass ArchiveBuilder::get_requested_narrow_klass(Klass* k) {
1041 assert(CDSConfig::is_dumping_heap(), "sanity");
1042 k = get_buffered_klass(k);
1043 Klass* requested_k = to_requested(k);
1044 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
1045 const int narrow_klass_shift = ArchiveHeapWriter::precomputed_narrow_klass_shift;
1046 return CompressedKlassPointers::encode_not_null(requested_k, narrow_klass_base, narrow_klass_shift);
1047 }
1048 #endif // INCLUDE_CDS_JAVA_HEAP
1049
1050 // RelocateBufferToRequested --- Relocate all the pointers in rw/ro,
1051 // so that the archive can be mapped to the "requested" location without runtime relocation.
1052 //
1053 // - See ArchiveBuilder header for the definition of "buffer", "mapped" and "requested"
1054 // - ArchivePtrMarker::ptrmap() marks all the pointers in the rw/ro regions
1055 // - Every pointer must have one of the following values:
1056 // [a] nullptr:
1057 // No relocation is needed. Remove this pointer from ptrmap so we don't need to
1058 // consider it at runtime.
1059 // [b] Points into an object X which is inside the buffer:
1060 // Adjust this pointer by _buffer_to_requested_delta, so it points to X
1061 // when the archive is mapped at the requested location.
1062 // [c] Points into an object Y which is inside mapped static archive:
1063 // - This happens only during dynamic dump
1064 // - Adjust this pointer by _mapped_to_requested_static_archive_delta,
1065 // so it points to Y when the static archive is mapped at the requested location.
1066 template <bool STATIC_DUMP>
1067 class RelocateBufferToRequested : public BitMapClosure {
1068 ArchiveBuilder* _builder;
1069 address _buffer_bottom;
1070 intx _buffer_to_requested_delta;
1071 intx _mapped_to_requested_static_archive_delta;
1072 size_t _max_non_null_offset;
1073
1074 public:
1075 RelocateBufferToRequested(ArchiveBuilder* builder) {
1076 _builder = builder;
1077 _buffer_bottom = _builder->buffer_bottom();
1078 _buffer_to_requested_delta = builder->buffer_to_requested_delta();
1079 _mapped_to_requested_static_archive_delta = builder->requested_static_archive_bottom() - builder->mapped_static_archive_bottom();
1080 _max_non_null_offset = 0;
1081
1082 address bottom = _builder->buffer_bottom();
1083 address top = _builder->buffer_top();
1084 address new_bottom = bottom + _buffer_to_requested_delta;
1085 address new_top = top + _buffer_to_requested_delta;
1086 log_debug(cds)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT "] to "
1087 "[" INTPTR_FORMAT " - " INTPTR_FORMAT "]",
1088 p2i(bottom), p2i(top),
1089 p2i(new_bottom), p2i(new_top));
1090 }
1091
1092 bool do_bit(size_t offset) {
1093 address* p = (address*)_buffer_bottom + offset;
1094 assert(_builder->is_in_buffer_space(p), "pointer must live in buffer space");
1095
1096 if (*p == nullptr) {
1097 // todo -- clear bit, etc
1098 ArchivePtrMarker::ptrmap()->clear_bit(offset);
1099 } else {
1100 if (STATIC_DUMP) {
1101 assert(_builder->is_in_buffer_space(*p), "old pointer must point inside buffer space");
1102 *p += _buffer_to_requested_delta;
1103 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1104 } else {
1105 if (_builder->is_in_buffer_space(*p)) {
1106 *p += _buffer_to_requested_delta;
1107 // assert is in requested dynamic archive
1108 } else {
1109 assert(_builder->is_in_mapped_static_archive(*p), "old pointer must point inside buffer space or mapped static archive");
1110 *p += _mapped_to_requested_static_archive_delta;
1111 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1112 }
1113 }
1114 _max_non_null_offset = offset;
1115 }
1116
1117 return true; // keep iterating
1118 }
1119
1120 void doit() {
1121 ArchivePtrMarker::ptrmap()->iterate(this);
1122 ArchivePtrMarker::compact(_max_non_null_offset);
1123 }
1124 };
1125
1126
1127 void ArchiveBuilder::relocate_to_requested() {
1128 if (!ro_region()->is_packed()) {
1129 ro_region()->pack();
1130 }
1131
1132 size_t my_archive_size = buffer_top() - buffer_bottom();
1133
1134 if (CDSConfig::is_dumping_static_archive()) {
1135 _requested_static_archive_top = _requested_static_archive_bottom + my_archive_size;
1136 RelocateBufferToRequested<true> patcher(this);
1137 patcher.doit();
1138 } else {
1139 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1140 _requested_dynamic_archive_top = _requested_dynamic_archive_bottom + my_archive_size;
1141 RelocateBufferToRequested<false> patcher(this);
1142 patcher.doit();
1143 }
1144 }
1145
1146 // Write detailed info to a mapfile to analyze contents of the archive.
1147 // static dump:
1148 // java -Xshare:dump -Xlog:cds+map=trace:file=cds.map:none:filesize=0
1149 // dynamic dump:
1150 // java -cp MyApp.jar -XX:ArchiveClassesAtExit=MyApp.jsa \
1151 // -Xlog:cds+map=trace:file=cds.map:none:filesize=0 MyApp
1152 //
1153 // We need to do some address translation because the buffers used at dump time may be mapped to
1154 // a different location at runtime. At dump time, the buffers may be at arbitrary locations
1155 // picked by the OS. At runtime, we try to map at a fixed location (SharedBaseAddress). For
1156 // consistency, we log everything using runtime addresses.
1157 class ArchiveBuilder::CDSMapLogger : AllStatic {
1158 static intx buffer_to_runtime_delta() {
1159 // Translate the buffers used by the RW/RO regions to their eventual (requested) locations
1160 // at runtime.
1161 return ArchiveBuilder::current()->buffer_to_requested_delta();
1162 }
1163
1164 // rw/ro regions only
1165 static void log_metaspace_region(const char* name, DumpRegion* region,
1166 const ArchiveBuilder::SourceObjList* src_objs) {
1167 address region_base = address(region->base());
1168 address region_top = address(region->top());
1169 log_region(name, region_base, region_top, region_base + buffer_to_runtime_delta());
1170 log_metaspace_objects(region, src_objs);
1171 }
1172
1173 #define _LOG_PREFIX PTR_FORMAT ": @@ %-17s %d"
1174
1175 static void log_klass(Klass* k, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1176 ResourceMark rm(current);
1177 log_debug(cds, map)(_LOG_PREFIX " %s",
1178 p2i(runtime_dest), type_name, bytes, k->external_name());
1179 }
1180 static void log_method(Method* m, 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, m->external_name());
1184 }
1185
1186 // rw/ro regions only
1187 static void log_metaspace_objects(DumpRegion* region, const ArchiveBuilder::SourceObjList* src_objs) {
1188 address last_obj_base = address(region->base());
1189 address last_obj_end = address(region->base());
1190 address region_end = address(region->end());
1191 Thread* current = Thread::current();
1192 for (int i = 0; i < src_objs->objs()->length(); i++) {
1193 SourceObjInfo* src_info = src_objs->at(i);
1194 address src = src_info->source_addr();
1195 address dest = src_info->buffered_addr();
1196 log_as_hex(last_obj_base, dest, last_obj_base + buffer_to_runtime_delta());
1197 address runtime_dest = dest + buffer_to_runtime_delta();
1198 int bytes = src_info->size_in_bytes();
1199
1200 MetaspaceObj::Type type = src_info->msotype();
1201 const char* type_name = MetaspaceObj::type_name(type);
1202
1203 switch (type) {
1204 case MetaspaceObj::ClassType:
1205 log_klass((Klass*)src, runtime_dest, type_name, bytes, current);
1206 break;
1207 case MetaspaceObj::ConstantPoolType:
1208 log_klass(((ConstantPool*)src)->pool_holder(),
1209 runtime_dest, type_name, bytes, current);
1210 break;
1211 case MetaspaceObj::ConstantPoolCacheType:
1212 log_klass(((ConstantPoolCache*)src)->constant_pool()->pool_holder(),
1213 runtime_dest, type_name, bytes, current);
1214 break;
1215 case MetaspaceObj::MethodType:
1216 log_method((Method*)src, runtime_dest, type_name, bytes, current);
1217 break;
1218 case MetaspaceObj::ConstMethodType:
1219 log_method(((ConstMethod*)src)->method(), runtime_dest, type_name, bytes, current);
1220 break;
1221 case MetaspaceObj::SymbolType:
1222 {
1223 ResourceMark rm(current);
1224 Symbol* s = (Symbol*)src;
1225 log_debug(cds, map)(_LOG_PREFIX " %s", p2i(runtime_dest), type_name, bytes,
1226 s->as_quoted_ascii());
1227 }
1228 break;
1229 default:
1230 log_debug(cds, map)(_LOG_PREFIX, p2i(runtime_dest), type_name, bytes);
1231 break;
1232 }
1233
1234 last_obj_base = dest;
1235 last_obj_end = dest + bytes;
1236 }
1237
1238 log_as_hex(last_obj_base, last_obj_end, last_obj_base + buffer_to_runtime_delta());
1239 if (last_obj_end < region_end) {
1240 log_debug(cds, map)(PTR_FORMAT ": @@ Misc data " SIZE_FORMAT " bytes",
1241 p2i(last_obj_end + buffer_to_runtime_delta()),
1242 size_t(region_end - last_obj_end));
1243 log_as_hex(last_obj_end, region_end, last_obj_end + buffer_to_runtime_delta());
1244 }
1245 }
1246
1247 #undef _LOG_PREFIX
1248
1249 // Log information about a region, whose address at dump time is [base .. top). At
1250 // runtime, this region will be mapped to requested_base. requested_base is 0 if this
1251 // region will be mapped at os-selected addresses (such as the bitmap region), or will
1252 // be accessed with os::read (the header).
1253 //
1254 // Note: across -Xshare:dump runs, base may be different, but requested_base should
1255 // be the same as the archive contents should be deterministic.
1256 static void log_region(const char* name, address base, address top, address requested_base) {
1257 size_t size = top - base;
1258 base = requested_base;
1259 top = requested_base + size;
1260 log_info(cds, map)("[%-18s " PTR_FORMAT " - " PTR_FORMAT " " SIZE_FORMAT_W(9) " bytes]",
1261 name, p2i(base), p2i(top), size);
1262 }
1263
1264 #if INCLUDE_CDS_JAVA_HEAP
1265 static void log_heap_region(ArchiveHeapInfo* heap_info) {
1266 MemRegion r = heap_info->buffer_region();
1267 address start = address(r.start()); // start of the current oop inside the buffer
1268 address end = address(r.end());
1269 log_region("heap", start, end, ArchiveHeapWriter::buffered_addr_to_requested_addr(start));
1270
1271 LogStreamHandle(Info, cds, map) st;
1272
1273 while (start < end) {
1274 size_t byte_size;
1275 oop source_oop = ArchiveHeapWriter::buffered_addr_to_source_obj(start);
1276 address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1277 st.print(PTR_FORMAT ": @@ Object ", p2i(requested_start));
1278 int permobj_segment = -1;
1279 int permobj_segment_length = -1;
1280
1281 if (source_oop != nullptr) {
1282 // This is a regular oop that got archived.
1283 print_oop_with_requested_addr_cr(&st, source_oop, false);
1284 byte_size = source_oop->size() * BytesPerWord;
1285 } else if (start == ArchiveHeapWriter::buffered_heap_roots_addr()) {
1286 // HeapShared::roots() is copied specially, so it doesn't exist in
1287 // ArchiveHeapWriter::BufferOffsetToSourceObjectTable.
1288 // See ArchiveHeapWriter::copy_roots_to_buffer().
1289 st.print_cr("HeapShared::roots[%d]", HeapShared::pending_roots()->length());
1290 byte_size = ArchiveHeapWriter::heap_roots_word_size() * BytesPerWord;
1291 } else if ((byte_size = ArchiveHeapWriter::get_filler_size_at(start)) > 0) {
1292 // We have a filler oop, which also does not exist in BufferOffsetToSourceObjectTable.
1293 st.print_cr("filler " SIZE_FORMAT " bytes", byte_size);
1294 } else if ((permobj_segment = ArchiveHeapWriter::get_permobj_segment_at(start, &byte_size, &permobj_segment_length)) >= 0) {
1295 st.print_cr("permobj_%d[%d] %zu bytes", permobj_segment, permobj_segment_length, byte_size);
1296 } else {
1297 ShouldNotReachHere();
1298 }
1299
1300 address oop_end = start + byte_size;
1301 log_as_hex(start, oop_end, requested_start, /*is_heap=*/true);
1302
1303 if (source_oop != nullptr) {
1304 log_oop_details(heap_info, source_oop, /*buffered_addr=*/start);
1305 } else if (start == ArchiveHeapWriter::buffered_heap_roots_addr()) {
1306 log_heap_roots();
1307 } else if (permobj_segment >= 0) {
1308 log_permobj_segment(permobj_segment, permobj_segment_length);
1309 }
1310 start = oop_end;
1311 }
1312 }
1313
1314 // ArchivedFieldPrinter is used to print the fields of archived objects. We can't
1315 // use _source_obj->print_on(), because we want to print the oop fields
1316 // in _source_obj with their requested addresses using print_oop_with_requested_addr_cr().
1317 class ArchivedFieldPrinter : public FieldClosure {
1318 ArchiveHeapInfo* _heap_info;
1319 outputStream* _st;
1320 oop _source_obj;
1321 address _buffered_addr;
1322 public:
1323 ArchivedFieldPrinter(ArchiveHeapInfo* heap_info, outputStream* st, oop src_obj, address buffered_addr) :
1324 _heap_info(heap_info), _st(st), _source_obj(src_obj), _buffered_addr(buffered_addr) {}
1325
1326 void do_field(fieldDescriptor* fd) {
1327 _st->print(" - ");
1328 BasicType ft = fd->field_type();
1329 switch (ft) {
1330 case T_ARRAY:
1331 case T_OBJECT:
1332 fd->print_on(_st); // print just the name and offset
1333 print_oop_with_requested_addr_cr(_st, _source_obj->obj_field(fd->offset()));
1334 break;
1335 default:
1336 if (ArchiveHeapWriter::is_marked_as_native_pointer(_heap_info, _source_obj, fd->offset())) {
1337 print_as_native_pointer(fd);
1338 } else {
1339 fd->print_on_for(_st, cast_to_oop(_buffered_addr)); // name, offset, value
1340 _st->cr();
1341 }
1342 }
1343 }
1344
1345 void print_as_native_pointer(fieldDescriptor* fd) {
1346 LP64_ONLY(assert(fd->field_type() == T_LONG, "must be"));
1347 NOT_LP64 (assert(fd->field_type() == T_INT, "must be"));
1348
1349 // We have a field that looks like an integer, but it's actually a pointer to a MetaspaceObj.
1350 address source_native_ptr = (address)
1351 LP64_ONLY(_source_obj->long_field(fd->offset()))
1352 NOT_LP64( _source_obj->int_field (fd->offset()));
1353 ArchiveBuilder* builder = ArchiveBuilder::current();
1354
1355 // The value of the native pointer at runtime.
1356 address requested_native_ptr = builder->to_requested(builder->get_buffered_addr(source_native_ptr));
1357
1358 // The address of _source_obj at runtime
1359 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(_source_obj);
1360 // The address of this field in the requested space
1361 assert(requested_obj != nullptr, "Attempting to load field from null oop");
1362 address requested_field_addr = cast_from_oop<address>(requested_obj) + fd->offset();
1363
1364 fd->print_on(_st);
1365 _st->print_cr(PTR_FORMAT " (marked metadata pointer @" PTR_FORMAT " )",
1366 p2i(requested_native_ptr), p2i(requested_field_addr));
1367 }
1368 };
1369
1370 // Print the fields of instanceOops, or the elements of arrayOops
1371 static void log_oop_details(ArchiveHeapInfo* heap_info, oop source_oop, address buffered_addr) {
1372 LogStreamHandle(Trace, cds, map, oops) st;
1373 if (st.is_enabled()) {
1374 Klass* source_klass = source_oop->klass();
1375 ArchiveBuilder* builder = ArchiveBuilder::current();
1376 Klass* requested_klass = builder->to_requested(builder->get_buffered_addr(source_klass));
1377
1378 st.print(" - klass: ");
1379 source_klass->print_value_on(&st);
1380 st.print(" " PTR_FORMAT, p2i(requested_klass));
1381 st.cr();
1382
1383 if (source_oop->is_typeArray()) {
1384 TypeArrayKlass::cast(source_klass)->oop_print_elements_on(typeArrayOop(source_oop), &st);
1385 } else if (source_oop->is_objArray()) {
1386 objArrayOop source_obj_array = objArrayOop(source_oop);
1387 for (int i = 0; i < source_obj_array->length(); i++) {
1388 st.print(" -%4d: ", i);
1389 print_oop_with_requested_addr_cr(&st, source_obj_array->obj_at(i));
1390 }
1391 } else {
1392 st.print_cr(" - fields (" SIZE_FORMAT " words):", source_oop->size());
1393 ArchivedFieldPrinter print_field(heap_info, &st, source_oop, buffered_addr);
1394 InstanceKlass::cast(source_klass)->print_nonstatic_fields(&print_field);
1395 }
1396 }
1397 }
1398
1399 static void log_heap_roots() {
1400 LogStreamHandle(Trace, cds, map, oops) st;
1401 if (st.is_enabled()) {
1402 for (int i = 0; i < HeapShared::pending_roots()->length(); i++) {
1403 st.print("roots[%4d]: ", i);
1404 print_oop_with_requested_addr_cr(&st, HeapShared::pending_roots()->at(i));
1405 }
1406 }
1407 }
1408
1409 static void log_permobj_segment(int permobj_segment, int permobj_segment_length) {
1410 LogStreamHandle(Trace, cds, map, oops) st;
1411 if (st.is_enabled()) {
1412 for (int i = 0; i < permobj_segment_length; i++) {
1413 st.print("permobj_%d[%4d]: ", permobj_segment, i);
1414 print_oop_with_requested_addr_cr(&st, ArchiveHeapWriter::get_permobj_source_addr(permobj_segment, i));
1415 }
1416 }
1417 }
1418
1419
1420 // The output looks like this. The first number is the requested address. The second number is
1421 // the narrowOop version of the requested address.
1422 // 0x00000007ffc7e840 (0xfff8fd08) java.lang.Class
1423 // 0x00000007ffc000f8 (0xfff8001f) [B length: 11
1424 static void print_oop_with_requested_addr_cr(outputStream* st, oop source_oop, bool print_addr = true) {
1425 if (source_oop == nullptr) {
1426 st->print_cr("null");
1427 } else {
1428 ResourceMark rm;
1429 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(source_oop);
1430 if (print_addr) {
1431 st->print(PTR_FORMAT " ", p2i(requested_obj));
1432 }
1433 if (UseCompressedOops) {
1434 st->print("(0x%08x) ", CompressedOops::narrow_oop_value(requested_obj));
1435 }
1436 if (source_oop->is_array()) {
1437 int array_len = arrayOop(source_oop)->length();
1438 st->print_cr("%s length: %d", source_oop->klass()->external_name(), array_len);
1439 } else {
1440 st->print("%s", source_oop->klass()->external_name());
1441 if (java_lang_invoke_MethodType::is_instance(source_oop)) {
1442 st->print(" ");
1443 java_lang_invoke_MethodType::print_signature(source_oop, st);
1444 }
1445 st->cr();
1446 }
1447 }
1448 }
1449 #endif // INCLUDE_CDS_JAVA_HEAP
1450
1451 // Log all the data [base...top). Pretend that the base address
1452 // will be mapped to requested_base at run-time.
1453 static void log_as_hex(address base, address top, address requested_base, bool is_heap = false) {
1454 assert(top >= base, "must be");
1455
1456 LogStreamHandle(Trace, cds, map) lsh;
1457 if (lsh.is_enabled()) {
1458 int unitsize = sizeof(address);
1459 if (is_heap && UseCompressedOops) {
1460 // This makes the compressed oop pointers easier to read, but
1461 // longs and doubles will be split into two words.
1462 unitsize = sizeof(narrowOop);
1463 }
1464 os::print_hex_dump(&lsh, base, top, unitsize, 32, requested_base);
1465 }
1466 }
1467
1468 static void log_header(FileMapInfo* mapinfo) {
1469 LogStreamHandle(Info, cds, map) lsh;
1470 if (lsh.is_enabled()) {
1471 mapinfo->print(&lsh);
1472 }
1473 }
1474
1475 public:
1476 static void log(ArchiveBuilder* builder, FileMapInfo* mapinfo,
1477 ArchiveHeapInfo* heap_info,
1478 char* bitmap, size_t bitmap_size_in_bytes) {
1479 log_info(cds, map)("%s CDS archive map for %s", CDSConfig::is_dumping_static_archive() ? "Static" : "Dynamic", mapinfo->full_path());
1480
1481 address header = address(mapinfo->header());
1482 address header_end = header + mapinfo->header()->header_size();
1483 log_region("header", header, header_end, 0);
1484 log_header(mapinfo);
1485 log_as_hex(header, header_end, 0);
1486
1487 DumpRegion* rw_region = &builder->_rw_region;
1488 DumpRegion* ro_region = &builder->_ro_region;
1489
1490 log_metaspace_region("rw region", rw_region, &builder->_rw_src_objs);
1491 log_metaspace_region("ro region", ro_region, &builder->_ro_src_objs);
1492
1493 address bitmap_end = address(bitmap + bitmap_size_in_bytes);
1494 log_region("bitmap", address(bitmap), bitmap_end, 0);
1495 log_as_hex((address)bitmap, bitmap_end, 0);
1496
1497 #if INCLUDE_CDS_JAVA_HEAP
1498 if (heap_info->is_used()) {
1499 log_heap_region(heap_info);
1500 }
1501 #endif
1502
1503 log_info(cds, map)("[End of CDS archive map]");
1504 }
1505 }; // end ArchiveBuilder::CDSMapLogger
1506
1507 void ArchiveBuilder::print_stats() {
1508 _alloc_stats.print_stats(int(_ro_region.used()), int(_rw_region.used()));
1509 }
1510
1511 void ArchiveBuilder::write_archive(FileMapInfo* mapinfo, ArchiveHeapInfo* heap_info) {
1512 // Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
1513 // MetaspaceShared::n_regions (internal to hotspot).
1514 assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
1515
1516 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1517 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1518 write_region(mapinfo, MetaspaceShared::cc, &_cc_region, /*read_only=*/false,/*allow_exec=*/true);
1519
1520 // Split pointer map into read-write and read-only bitmaps
1521 ArchivePtrMarker::initialize_rw_ro_cc_maps(&_rw_ptrmap, &_ro_ptrmap, &_cc_ptrmap);
1522
1523 size_t bitmap_size_in_bytes;
1524 char* bitmap = mapinfo->write_bitmap_region(ArchivePtrMarker::rw_ptrmap(),
1525 ArchivePtrMarker::ro_ptrmap(),
1526 ArchivePtrMarker::cc_ptrmap(),
1527 heap_info,
1528 bitmap_size_in_bytes);
1529
1530 if (heap_info->is_used()) {
1531 _total_heap_region_size = mapinfo->write_heap_region(heap_info);
1532 }
1533
1534 print_region_stats(mapinfo, heap_info);
1535
1536 mapinfo->set_requested_base((char*)MetaspaceShared::requested_base_address());
1537 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1538 // After this point, we should not write any data into mapinfo->header() since this
1539 // would corrupt its checksum we have calculated before.
1540 mapinfo->write_header();
1541 mapinfo->close();
1542
1543 if (log_is_enabled(Info, cds)) {
1544 print_stats();
1545 }
1546
1547 if (log_is_enabled(Info, cds, map)) {
1548 CDSMapLogger::log(this, mapinfo, heap_info,
1549 bitmap, bitmap_size_in_bytes);
1550 }
1551 CDS_JAVA_HEAP_ONLY(HeapShared::destroy_archived_object_cache());
1552 FREE_C_HEAP_ARRAY(char, bitmap);
1553 }
1554
1555 void ArchiveBuilder::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only, bool allow_exec) {
1556 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1557 }
1558
1559 void ArchiveBuilder::print_region_stats(FileMapInfo *mapinfo, ArchiveHeapInfo* heap_info) {
1560 // Print statistics of all the regions
1561 const size_t bitmap_used = mapinfo->region_at(MetaspaceShared::bm)->used();
1562 const size_t bitmap_reserved = mapinfo->region_at(MetaspaceShared::bm)->used_aligned();
1563 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1564 bitmap_reserved +
1565 _total_heap_region_size;
1566 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1567 bitmap_used +
1568 _total_heap_region_size;
1569 const double total_u_perc = percent_of(total_bytes, total_reserved);
1570
1571 _rw_region.print(total_reserved);
1572 _ro_region.print(total_reserved);
1573 _cc_region.print(total_reserved);
1574
1575 print_bitmap_region_stats(bitmap_used, total_reserved);
1576
1577 if (heap_info->is_used()) {
1578 print_heap_region_stats(heap_info, total_reserved);
1579 }
1580
1581 log_debug(cds)("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1582 total_bytes, total_reserved, total_u_perc);
1583 }
1584
1585 void ArchiveBuilder::print_bitmap_region_stats(size_t size, size_t total_size) {
1586 log_debug(cds)("bm space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used]",
1587 size, size/double(total_size)*100.0, size);
1588 }
1589
1590 void ArchiveBuilder::print_heap_region_stats(ArchiveHeapInfo *info, size_t total_size) {
1591 char* start = info->buffer_start();
1592 size_t size = info->buffer_byte_size();
1593 char* top = start + size;
1594 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,
1595 size, size/double(total_size)*100.0, size, p2i(start));
1596 }
1597
1598 void ArchiveBuilder::report_out_of_space(const char* name, size_t needed_bytes) {
1599 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
1600 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
1601 // or so.
1602 _rw_region.print_out_of_space_msg(name, needed_bytes);
1603 _ro_region.print_out_of_space_msg(name, needed_bytes);
1604
1605 log_error(cds)("Unable to allocate from '%s' region: Please reduce the number of shared classes.", name);
1606 MetaspaceShared::unrecoverable_writing_error();
1607 }