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 _requested_static_archive_bottom(nullptr),
157 _requested_static_archive_top(nullptr),
158 _requested_dynamic_archive_bottom(nullptr),
159 _requested_dynamic_archive_top(nullptr),
160 _mapped_static_archive_bottom(nullptr),
161 _mapped_static_archive_top(nullptr),
162 _buffer_to_requested_delta(0),
163 _pz_region("pz", MAX_SHARED_DELTA), // protection zone -- used only during dumping; does NOT exist in cds archive.
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 mtClassShared);
314 if (!rs.is_reserved()) {
315 log_error(cds)("Failed to reserve %zu bytes of output buffer.", buffer_size);
316 MetaspaceShared::unrecoverable_writing_error();
317 }
318
319 // buffer_bottom is the lowest address of the 2 core regions (rw, ro) when
320 // we are copying the class metadata into the buffer.
321 address buffer_bottom = (address)rs.base();
322 log_info(cds)("Reserved output buffer space at " PTR_FORMAT " [%zu bytes]",
323 p2i(buffer_bottom), buffer_size);
324 _shared_rs = rs;
325
326 _buffer_bottom = buffer_bottom;
327
328 if (CDSConfig::is_dumping_static_archive()) {
329 _current_dump_region = &_pz_region;
330 } else {
331 _current_dump_region = &_rw_region;
332 }
333 _current_dump_region->init(&_shared_rs, &_shared_vs);
334
335 ArchivePtrMarker::initialize(&_ptrmap, &_shared_vs);
336
337 // The bottom of the static archive should be mapped at this address by default.
338 _requested_static_archive_bottom = (address)MetaspaceShared::requested_base_address();
339
340 // The bottom of the archive (that I am writing now) should be mapped at this address by default.
341 address my_archive_requested_bottom;
342
343 if (CDSConfig::is_dumping_static_archive()) {
344 my_archive_requested_bottom = _requested_static_archive_bottom;
345 } else {
346 _mapped_static_archive_bottom = (address)MetaspaceObj::shared_metaspace_base();
347 _mapped_static_archive_top = (address)MetaspaceObj::shared_metaspace_top();
348 assert(_mapped_static_archive_top >= _mapped_static_archive_bottom, "must be");
349 size_t static_archive_size = _mapped_static_archive_top - _mapped_static_archive_bottom;
350
351 // At run time, we will mmap the dynamic archive at my_archive_requested_bottom
352 _requested_static_archive_top = _requested_static_archive_bottom + static_archive_size;
353 my_archive_requested_bottom = align_up(_requested_static_archive_top, MetaspaceShared::core_region_alignment());
354
355 _requested_dynamic_archive_bottom = my_archive_requested_bottom;
356 }
357
358 _buffer_to_requested_delta = my_archive_requested_bottom - _buffer_bottom;
359
360 address my_archive_requested_top = my_archive_requested_bottom + buffer_size;
361 if (my_archive_requested_bottom < _requested_static_archive_bottom ||
362 my_archive_requested_top <= _requested_static_archive_bottom) {
363 // Size overflow.
364 log_error(cds)("my_archive_requested_bottom = " INTPTR_FORMAT, p2i(my_archive_requested_bottom));
365 log_error(cds)("my_archive_requested_top = " INTPTR_FORMAT, p2i(my_archive_requested_top));
366 log_error(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is too high. "
367 "Please rerun java -Xshare:dump with a lower value", p2i(_requested_static_archive_bottom));
368 MetaspaceShared::unrecoverable_writing_error();
369 }
370
371 if (CDSConfig::is_dumping_static_archive()) {
372 // We don't want any valid object to be at the very bottom of the archive.
373 // See ArchivePtrMarker::mark_pointer().
374 _pz_region.allocate(MetaspaceShared::protection_zone_size());
375 start_dump_region(&_rw_region);
376 }
377
378 return buffer_bottom;
379 }
380
381 void ArchiveBuilder::iterate_sorted_roots(MetaspaceClosure* it) {
382 int num_symbols = _symbols->length();
383 for (int i = 0; i < num_symbols; i++) {
384 it->push(_symbols->adr_at(i));
385 }
386
387 int num_klasses = _klasses->length();
388 for (int i = 0; i < num_klasses; i++) {
389 it->push(_klasses->adr_at(i));
390 }
391
392 iterate_roots(it);
393 }
394
395 class GatherSortedSourceObjs : public MetaspaceClosure {
396 ArchiveBuilder* _builder;
397
398 public:
399 GatherSortedSourceObjs(ArchiveBuilder* builder) : _builder(builder) {}
400
401 virtual bool do_ref(Ref* ref, bool read_only) {
402 return _builder->gather_one_source_obj(ref, read_only);
403 }
404 };
405
406 bool ArchiveBuilder::gather_one_source_obj(MetaspaceClosure::Ref* ref, bool read_only) {
407 address src_obj = ref->obj();
408 if (src_obj == nullptr) {
409 return false;
410 }
411
412 remember_embedded_pointer_in_enclosing_obj(ref);
413 if (RegeneratedClasses::has_been_regenerated(src_obj)) {
414 // No need to copy it. We will later relocate it to point to the regenerated klass/method.
415 return false;
416 }
417
418 FollowMode follow_mode = get_follow_mode(ref);
419 SourceObjInfo src_info(ref, read_only, follow_mode);
420 bool created;
421 SourceObjInfo* p = _src_obj_table.put_if_absent(src_obj, src_info, &created);
422 if (created) {
423 if (_src_obj_table.maybe_grow()) {
424 log_info(cds, hashtables)("Expanded _src_obj_table table to %d", _src_obj_table.table_size());
425 }
426 }
427
428 #ifdef ASSERT
429 if (ref->msotype() == MetaspaceObj::MethodType) {
430 Method* m = (Method*)ref->obj();
431 assert(!RegeneratedClasses::has_been_regenerated((address)m->method_holder()),
432 "Should not archive methods in a class that has been regenerated");
433 }
434 #endif
435
436 assert(p->read_only() == src_info.read_only(), "must be");
437
438 if (created && src_info.should_copy()) {
439 if (read_only) {
440 _ro_src_objs.append(p);
441 } else {
442 _rw_src_objs.append(p);
443 }
444 return true; // Need to recurse into this ref only if we are copying it
445 } else {
446 return false;
447 }
448 }
449
450 void ArchiveBuilder::record_regenerated_object(address orig_src_obj, address regen_src_obj) {
451 // Record the fact that orig_src_obj has been replaced by regen_src_obj. All calls to get_buffered_addr(orig_src_obj)
452 // should return the same value as get_buffered_addr(regen_src_obj).
453 SourceObjInfo* p = _src_obj_table.get(regen_src_obj);
454 assert(p != nullptr, "regenerated object should always be dumped");
455 SourceObjInfo orig_src_info(orig_src_obj, p);
456 bool created;
457 _src_obj_table.put_if_absent(orig_src_obj, orig_src_info, &created);
458 assert(created, "We shouldn't have archived the original copy of a regenerated object");
459 }
460
461 // Remember that we have a pointer inside ref->enclosing_obj() that points to ref->obj()
462 void ArchiveBuilder::remember_embedded_pointer_in_enclosing_obj(MetaspaceClosure::Ref* ref) {
463 assert(ref->obj() != nullptr, "should have checked");
464
465 address enclosing_obj = ref->enclosing_obj();
466 if (enclosing_obj == nullptr) {
467 return;
468 }
469
470 // We are dealing with 3 addresses:
471 // address o = ref->obj(): We have found an object whose address is o.
472 // address* mpp = ref->mpp(): The object o is pointed to by a pointer whose address is mpp.
473 // I.e., (*mpp == o)
474 // enclosing_obj : If non-null, it is the object which has a field that points to o.
475 // mpp is the address if that field.
476 //
477 // Example: We have an array whose first element points to a Method:
478 // Method* o = 0x0000abcd;
479 // Array<Method*>* enclosing_obj = 0x00001000;
480 // enclosing_obj->at_put(0, o);
481 //
482 // We the MetaspaceClosure iterates on the very first element of this array, we have
483 // ref->obj() == 0x0000abcd (the Method)
484 // ref->mpp() == 0x00001008 (the location of the first element in the array)
485 // ref->enclosing_obj() == 0x00001000 (the Array that contains the Method)
486 //
487 // We use the above information to mark the bitmap to indicate that there's a pointer on address 0x00001008.
488 SourceObjInfo* src_info = _src_obj_table.get(enclosing_obj);
489 if (src_info == nullptr || !src_info->should_copy()) {
490 // source objects of point_to_it/set_to_null types are not copied
491 // so we don't need to remember their pointers.
492 } else {
493 if (src_info->read_only()) {
494 _ro_src_objs.remember_embedded_pointer(src_info, ref);
495 } else {
496 _rw_src_objs.remember_embedded_pointer(src_info, ref);
497 }
498 }
499 }
500
501 void ArchiveBuilder::gather_source_objs() {
502 ResourceMark rm;
503 log_info(cds)("Gathering all archivable objects ... ");
504 gather_klasses_and_symbols();
505 GatherSortedSourceObjs doit(this);
506 iterate_sorted_roots(&doit);
507 doit.finish();
508 }
509
510 bool ArchiveBuilder::is_excluded(Klass* klass) {
511 if (klass->is_instance_klass()) {
512 InstanceKlass* ik = InstanceKlass::cast(klass);
513 return SystemDictionaryShared::is_excluded_class(ik);
514 } else if (klass->is_objArray_klass()) {
515 Klass* bottom = ObjArrayKlass::cast(klass)->bottom_klass();
516 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_shared_static(bottom)) {
517 // The bottom class is in the static archive so it's clearly not excluded.
518 return false;
519 } else if (bottom->is_instance_klass()) {
520 return SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(bottom));
521 }
522 }
523
524 return false;
525 }
526
527 ArchiveBuilder::FollowMode ArchiveBuilder::get_follow_mode(MetaspaceClosure::Ref *ref) {
528 address obj = ref->obj();
529 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_in_shared_metaspace(obj)) {
530 // Don't dump existing shared metadata again.
531 return point_to_it;
532 } else if (ref->msotype() == MetaspaceObj::MethodDataType ||
533 ref->msotype() == MetaspaceObj::MethodCountersType) {
534 return set_to_null;
535 } else {
536 if (ref->msotype() == MetaspaceObj::ClassType) {
537 Klass* klass = (Klass*)ref->obj();
538 assert(klass->is_klass(), "must be");
539 if (is_excluded(klass)) {
540 ResourceMark rm;
541 log_debug(cds, dynamic)("Skipping class (excluded): %s", klass->external_name());
542 return set_to_null;
543 }
544 }
545
546 return make_a_copy;
547 }
548 }
549
550 void ArchiveBuilder::start_dump_region(DumpRegion* next) {
551 current_dump_region()->pack(next);
552 _current_dump_region = next;
553 }
554
555 char* ArchiveBuilder::ro_strdup(const char* s) {
556 char* archived_str = ro_region_alloc((int)strlen(s) + 1);
557 strcpy(archived_str, s);
558 return archived_str;
559 }
560
561 // The objects that have embedded pointers will sink
562 // towards the end of the list. This ensures we have a maximum
563 // number of leading zero bits in the relocation bitmap.
564 int ArchiveBuilder::compare_src_objs(SourceObjInfo** a, SourceObjInfo** b) {
565 if ((*a)->has_embedded_pointer() && !(*b)->has_embedded_pointer()) {
566 return 1;
567 } else if (!(*a)->has_embedded_pointer() && (*b)->has_embedded_pointer()) {
568 return -1;
569 } else {
570 // This is necessary to keep the sorting order stable. Otherwise the
571 // archive's contents may not be deterministic.
572 return (*a)->id() - (*b)->id();
573 }
574 }
575
576 void ArchiveBuilder::sort_metadata_objs() {
577 _rw_src_objs.objs()->sort(compare_src_objs);
578 _ro_src_objs.objs()->sort(compare_src_objs);
579 }
580
581 void ArchiveBuilder::dump_rw_metadata() {
582 ResourceMark rm;
583 log_info(cds)("Allocating RW objects ... ");
584 make_shallow_copies(&_rw_region, &_rw_src_objs);
585
586 #if INCLUDE_CDS_JAVA_HEAP
587 if (CDSConfig::is_dumping_full_module_graph()) {
588 // Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
589 char* start = rw_region()->top();
590 ClassLoaderDataShared::allocate_archived_tables();
591 alloc_stats()->record_modules(rw_region()->top() - start, /*read_only*/false);
592 }
593 #endif
594 }
595
596 void ArchiveBuilder::dump_ro_metadata() {
597 ResourceMark rm;
598 log_info(cds)("Allocating RO objects ... ");
599
600 start_dump_region(&_ro_region);
601 make_shallow_copies(&_ro_region, &_ro_src_objs);
602
603 #if INCLUDE_CDS_JAVA_HEAP
604 if (CDSConfig::is_dumping_full_module_graph()) {
605 char* start = ro_region()->top();
606 ClassLoaderDataShared::init_archived_tables();
607 alloc_stats()->record_modules(ro_region()->top() - start, /*read_only*/true);
608 }
609 #endif
610
611 RegeneratedClasses::record_regenerated_objects();
612 }
613
614 void ArchiveBuilder::make_shallow_copies(DumpRegion *dump_region,
615 const ArchiveBuilder::SourceObjList* src_objs) {
616 for (int i = 0; i < src_objs->objs()->length(); i++) {
617 make_shallow_copy(dump_region, src_objs->objs()->at(i));
618 }
619 log_info(cds)("done (%d objects)", src_objs->objs()->length());
620 }
621
622 void ArchiveBuilder::make_shallow_copy(DumpRegion *dump_region, SourceObjInfo* src_info) {
623 address src = src_info->source_addr();
624 int bytes = src_info->size_in_bytes();
625 char* dest;
626 char* oldtop;
627 char* newtop;
628
629 oldtop = dump_region->top();
630 if (src_info->msotype() == MetaspaceObj::ClassType) {
631 // Allocate space for a pointer directly in front of the future InstanceKlass, so
632 // we can do a quick lookup from InstanceKlass* -> RunTimeClassInfo*
633 // without building another hashtable. See RunTimeClassInfo::get_for()
634 // in systemDictionaryShared.cpp.
635 Klass* klass = (Klass*)src;
636 if (klass->is_instance_klass()) {
637 SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
638 dump_region->allocate(sizeof(address));
639 }
640 // Allocate space for the future InstanceKlass with proper alignment
641 const size_t alignment =
642 #ifdef _LP64
643 UseCompressedClassPointers ?
644 nth_bit(ArchiveBuilder::precomputed_narrow_klass_shift()) :
645 SharedSpaceObjectAlignment;
646 #else
647 SharedSpaceObjectAlignment;
648 #endif
649 dest = dump_region->allocate(bytes, alignment);
650 } else {
651 dest = dump_region->allocate(bytes);
652 }
653 newtop = dump_region->top();
654
655 memcpy(dest, src, bytes);
656
657 // Update the hash of buffered sorted symbols for static dump so that the symbols have deterministic contents
658 if (CDSConfig::is_dumping_static_archive() && (src_info->msotype() == MetaspaceObj::SymbolType)) {
659 Symbol* buffered_symbol = (Symbol*)dest;
660 assert(((Symbol*)src)->is_permanent(), "archived symbols must be permanent");
661 buffered_symbol->update_identity_hash();
662 }
663
664 {
665 bool created;
666 _buffered_to_src_table.put_if_absent((address)dest, src, &created);
667 assert(created, "must be");
668 if (_buffered_to_src_table.maybe_grow()) {
669 log_info(cds, hashtables)("Expanded _buffered_to_src_table table to %d", _buffered_to_src_table.table_size());
670 }
671 }
672
673 intptr_t* archived_vtable = CppVtables::get_archived_vtable(src_info->msotype(), (address)dest);
674 if (archived_vtable != nullptr) {
675 *(address*)dest = (address)archived_vtable;
676 ArchivePtrMarker::mark_pointer((address*)dest);
677 }
678
679 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(src), p2i(dest), bytes);
680 src_info->set_buffered_addr((address)dest);
681
682 _alloc_stats.record(src_info->msotype(), int(newtop - oldtop), src_info->read_only());
683
684 DEBUG_ONLY(_alloc_stats.verify((int)dump_region->used(), src_info->read_only()));
685 }
686
687 // This is used by code that hand-assembles data structures, such as the LambdaProxyClassKey, that are
688 // not handled by MetaspaceClosure.
689 void ArchiveBuilder::write_pointer_in_buffer(address* ptr_location, address src_addr) {
690 assert(is_in_buffer_space(ptr_location), "must be");
691 if (src_addr == nullptr) {
692 *ptr_location = nullptr;
693 ArchivePtrMarker::clear_pointer(ptr_location);
694 } else {
695 *ptr_location = get_buffered_addr(src_addr);
696 ArchivePtrMarker::mark_pointer(ptr_location);
697 }
698 }
699
700 void ArchiveBuilder::mark_and_relocate_to_buffered_addr(address* ptr_location) {
701 assert(*ptr_location != nullptr, "sanity");
702 if (!is_in_mapped_static_archive(*ptr_location)) {
703 *ptr_location = get_buffered_addr(*ptr_location);
704 }
705 ArchivePtrMarker::mark_pointer(ptr_location);
706 }
707
708 bool ArchiveBuilder::has_been_buffered(address src_addr) const {
709 if (RegeneratedClasses::has_been_regenerated(src_addr) ||
710 _src_obj_table.get(src_addr) == nullptr ||
711 get_buffered_addr(src_addr) == nullptr) {
712 return false;
713 } else {
714 return true;
715 }
716 }
717
718 address ArchiveBuilder::get_buffered_addr(address src_addr) const {
719 SourceObjInfo* p = _src_obj_table.get(src_addr);
720 assert(p != nullptr, "src_addr " INTPTR_FORMAT " is used but has not been archived",
721 p2i(src_addr));
722
723 return p->buffered_addr();
724 }
725
726 address ArchiveBuilder::get_source_addr(address buffered_addr) const {
727 assert(is_in_buffer_space(buffered_addr), "must be");
728 address* src_p = _buffered_to_src_table.get(buffered_addr);
729 assert(src_p != nullptr && *src_p != nullptr, "must be");
730 return *src_p;
731 }
732
733 void ArchiveBuilder::relocate_embedded_pointers(ArchiveBuilder::SourceObjList* src_objs) {
734 for (int i = 0; i < src_objs->objs()->length(); i++) {
735 src_objs->relocate(i, this);
736 }
737 }
738
739 void ArchiveBuilder::relocate_metaspaceobj_embedded_pointers() {
740 log_info(cds)("Relocating embedded pointers in core regions ... ");
741 relocate_embedded_pointers(&_rw_src_objs);
742 relocate_embedded_pointers(&_ro_src_objs);
743 }
744
745 #define ADD_COUNT(x) \
746 x += 1; \
747 x ## _a += aotlinked ? 1 : 0; \
748 x ## _i += inited ? 1 : 0;
749
750 #define DECLARE_INSTANCE_KLASS_COUNTER(x) \
751 int x = 0; \
752 int x ## _a = 0; \
753 int x ## _i = 0;
754
755 void ArchiveBuilder::make_klasses_shareable() {
756 DECLARE_INSTANCE_KLASS_COUNTER(num_instance_klasses);
757 DECLARE_INSTANCE_KLASS_COUNTER(num_boot_klasses);
758 DECLARE_INSTANCE_KLASS_COUNTER(num_vm_klasses);
759 DECLARE_INSTANCE_KLASS_COUNTER(num_platform_klasses);
760 DECLARE_INSTANCE_KLASS_COUNTER(num_app_klasses);
761 DECLARE_INSTANCE_KLASS_COUNTER(num_old_klasses);
762 DECLARE_INSTANCE_KLASS_COUNTER(num_hidden_klasses);
763 DECLARE_INSTANCE_KLASS_COUNTER(num_enum_klasses);
764 DECLARE_INSTANCE_KLASS_COUNTER(num_unregistered_klasses);
765 int num_unlinked_klasses = 0;
766 int num_obj_array_klasses = 0;
767 int num_type_array_klasses = 0;
768
769 int boot_unlinked = 0;
770 int platform_unlinked = 0;
771 int app_unlinked = 0;
772 int unreg_unlinked = 0;
773
774 for (int i = 0; i < klasses()->length(); i++) {
775 // Some of the code in ConstantPool::remove_unshareable_info() requires the classes
776 // to be in linked state, so it must be call here before the next loop, which returns
777 // all classes to unlinked state.
778 Klass* k = get_buffered_addr(klasses()->at(i));
779 if (k->is_instance_klass()) {
780 InstanceKlass::cast(k)->constants()->remove_unshareable_info();
781 }
782 }
783
784 for (int i = 0; i < klasses()->length(); i++) {
785 const char* type;
786 const char* unlinked = "";
787 const char* kind = "";
788 const char* hidden = "";
789 const char* old = "";
790 const char* generated = "";
791 const char* aotlinked_msg = "";
792 const char* inited_msg = "";
793 Klass* k = get_buffered_addr(klasses()->at(i));
794 bool inited = false;
795 k->remove_java_mirror();
796 #ifdef _LP64
797 if (UseCompactObjectHeaders) {
798 Klass* requested_k = to_requested(k);
799 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
800 const int narrow_klass_shift = precomputed_narrow_klass_shift();
801 narrowKlass nk = CompressedKlassPointers::encode_not_null_without_asserts(requested_k, narrow_klass_base, narrow_klass_shift);
802 k->set_prototype_header(markWord::prototype().set_narrow_klass(nk));
803 }
804 #endif //_LP64
805 if (k->is_objArray_klass()) {
806 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
807 // on their array classes.
808 num_obj_array_klasses ++;
809 type = "array";
810 } else if (k->is_typeArray_klass()) {
811 num_type_array_klasses ++;
812 type = "array";
813 k->remove_unshareable_info();
814 } else {
815 assert(k->is_instance_klass(), " must be");
816 InstanceKlass* ik = InstanceKlass::cast(k);
817 InstanceKlass* src_ik = get_source_addr(ik);
818 bool aotlinked = AOTClassLinker::is_candidate(src_ik);
819 inited = ik->has_aot_initialized_mirror();
820 ADD_COUNT(num_instance_klasses);
821 if (CDSConfig::is_dumping_dynamic_archive()) {
822 // For static dump, class loader type are already set.
823 ik->assign_class_loader_type();
824 }
825 if (ik->is_hidden()) {
826 ADD_COUNT(num_hidden_klasses);
827 hidden = " hidden";
828 oop loader = k->class_loader();
829 if (loader == nullptr) {
830 type = "boot";
831 ADD_COUNT(num_boot_klasses);
832 } else if (loader == SystemDictionary::java_platform_loader()) {
833 type = "plat";
834 ADD_COUNT(num_platform_klasses);
835 } else if (loader == SystemDictionary::java_system_loader()) {
836 type = "app";
837 ADD_COUNT(num_app_klasses);
838 } else {
839 type = "bad";
840 assert(0, "shouldn't happen");
841 }
842 if (CDSConfig::is_dumping_method_handles()) {
843 assert(HeapShared::is_archivable_hidden_klass(ik), "sanity");
844 } else {
845 // Legacy CDS support for lambda proxies
846 CDS_JAVA_HEAP_ONLY(assert(HeapShared::is_lambda_proxy_klass(ik), "sanity");)
847 }
848 } else if (ik->is_shared_boot_class()) {
849 type = "boot";
850 ADD_COUNT(num_boot_klasses);
851 } else if (ik->is_shared_platform_class()) {
852 type = "plat";
853 ADD_COUNT(num_platform_klasses);
854 } else if (ik->is_shared_app_class()) {
855 type = "app";
856 ADD_COUNT(num_app_klasses);
857 } else {
858 assert(ik->is_shared_unregistered_class(), "must be");
859 type = "unreg";
860 ADD_COUNT(num_unregistered_klasses);
861 }
862
863 if (AOTClassLinker::is_vm_class(src_ik)) {
864 ADD_COUNT(num_vm_klasses);
865 }
866
867 if (!ik->is_linked()) {
868 num_unlinked_klasses ++;
869 unlinked = " unlinked";
870 if (ik->is_shared_boot_class()) {
871 boot_unlinked ++;
872 } else if (ik->is_shared_platform_class()) {
873 platform_unlinked ++;
874 } else if (ik->is_shared_app_class()) {
875 app_unlinked ++;
876 } else {
877 unreg_unlinked ++;
878 }
879 }
880
881 if (ik->is_interface()) {
882 kind = " interface";
883 } else if (src_ik->is_enum_subclass()) {
884 kind = " enum";
885 ADD_COUNT(num_enum_klasses);
886 }
887
888 if (!ik->can_be_verified_at_dumptime()) {
889 ADD_COUNT(num_old_klasses);
890 old = " old";
891 }
892
893 if (ik->is_generated_shared_class()) {
894 generated = " generated";
895 }
896 if (aotlinked) {
897 aotlinked_msg = " aot-linked";
898 }
899 if (inited) {
900 if (InstanceKlass::cast(k)->static_field_size() == 0) {
901 inited_msg = " inited (no static fields)";
902 } else {
903 inited_msg = " inited";
904 }
905 }
906
907 MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread::current(), ik);
908 ik->remove_unshareable_info();
909 }
910
911 if (log_is_enabled(Debug, cds, class)) {
912 ResourceMark rm;
913 log_debug(cds, class)("klasses[%5d] = " PTR_FORMAT " %-5s %s%s%s%s%s%s%s%s", i,
914 p2i(to_requested(k)), type, k->external_name(),
915 kind, hidden, old, unlinked, generated, aotlinked_msg, inited_msg);
916 }
917 }
918
919 #define STATS_FORMAT "= %5d, aot-linked = %5d, inited = %5d"
920 #define STATS_PARAMS(x) num_ ## x, num_ ## x ## _a, num_ ## x ## _i
921
922 log_info(cds)("Number of classes %d", num_instance_klasses + num_obj_array_klasses + num_type_array_klasses);
923 log_info(cds)(" instance classes " STATS_FORMAT, STATS_PARAMS(instance_klasses));
924 log_info(cds)(" boot " STATS_FORMAT, STATS_PARAMS(boot_klasses));
925 log_info(cds)(" vm " STATS_FORMAT, STATS_PARAMS(vm_klasses));
926 log_info(cds)(" platform " STATS_FORMAT, STATS_PARAMS(platform_klasses));
927 log_info(cds)(" app " STATS_FORMAT, STATS_PARAMS(app_klasses));
928 log_info(cds)(" unregistered " STATS_FORMAT, STATS_PARAMS(unregistered_klasses));
929 log_info(cds)(" (enum) " STATS_FORMAT, STATS_PARAMS(enum_klasses));
930 log_info(cds)(" (hidden) " STATS_FORMAT, STATS_PARAMS(hidden_klasses));
931 log_info(cds)(" (old) " STATS_FORMAT, STATS_PARAMS(old_klasses));
932 log_info(cds)(" (unlinked) = %5d, boot = %d, plat = %d, app = %d, unreg = %d",
933 num_unlinked_klasses, boot_unlinked, platform_unlinked, app_unlinked, unreg_unlinked);
934 log_info(cds)(" obj array classes = %5d", num_obj_array_klasses);
935 log_info(cds)(" type array classes = %5d", num_type_array_klasses);
936 log_info(cds)(" symbols = %5d", _symbols->length());
937
938 #undef STATS_FORMAT
939 #undef STATS_PARAMS
940
941 DynamicArchive::make_array_klasses_shareable();
942 }
943
944 void ArchiveBuilder::serialize_dynamic_archivable_items(SerializeClosure* soc) {
945 SymbolTable::serialize_shared_table_header(soc, false);
946 SystemDictionaryShared::serialize_dictionary_headers(soc, false);
947 DynamicArchive::serialize_array_klasses(soc);
948 AOTLinkedClassBulkLoader::serialize(soc, false);
949 }
950
951 uintx ArchiveBuilder::buffer_to_offset(address p) const {
952 address requested_p = to_requested(p);
953 assert(requested_p >= _requested_static_archive_bottom, "must be");
954 return requested_p - _requested_static_archive_bottom;
955 }
956
957 uintx ArchiveBuilder::any_to_offset(address p) const {
958 if (is_in_mapped_static_archive(p)) {
959 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
960 return p - _mapped_static_archive_bottom;
961 }
962 if (!is_in_buffer_space(p)) {
963 // p must be a "source" address
964 p = get_buffered_addr(p);
965 }
966 return buffer_to_offset(p);
967 }
968
969 address ArchiveBuilder::offset_to_buffered_address(u4 offset) const {
970 address requested_addr = _requested_static_archive_bottom + offset;
971 address buffered_addr = requested_addr - _buffer_to_requested_delta;
972 assert(is_in_buffer_space(buffered_addr), "bad offset");
973 return buffered_addr;
974 }
975
976 #if INCLUDE_CDS_JAVA_HEAP
977 narrowKlass ArchiveBuilder::get_requested_narrow_klass(Klass* k) {
978 assert(CDSConfig::is_dumping_heap(), "sanity");
979 k = get_buffered_klass(k);
980 Klass* requested_k = to_requested(k);
981 const int narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
982 #ifdef ASSERT
983 const size_t klass_alignment = MAX2(SharedSpaceObjectAlignment, (size_t)nth_bit(narrow_klass_shift));
984 assert(is_aligned(k, klass_alignment), "Klass " PTR_FORMAT " misaligned.", p2i(k));
985 #endif
986 address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
987 // Note: use the "raw" version of encode that takes explicit narrow klass base and shift. Don't use any
988 // of the variants that do sanity checks, nor any of those that use the current - dump - JVM's encoding setting.
989 return CompressedKlassPointers::encode_not_null_without_asserts(requested_k, narrow_klass_base, narrow_klass_shift);
990 }
991 #endif // INCLUDE_CDS_JAVA_HEAP
992
993 // RelocateBufferToRequested --- Relocate all the pointers in rw/ro,
994 // so that the archive can be mapped to the "requested" location without runtime relocation.
995 //
996 // - See ArchiveBuilder header for the definition of "buffer", "mapped" and "requested"
997 // - ArchivePtrMarker::ptrmap() marks all the pointers in the rw/ro regions
998 // - Every pointer must have one of the following values:
999 // [a] nullptr:
1000 // No relocation is needed. Remove this pointer from ptrmap so we don't need to
1001 // consider it at runtime.
1002 // [b] Points into an object X which is inside the buffer:
1003 // Adjust this pointer by _buffer_to_requested_delta, so it points to X
1004 // when the archive is mapped at the requested location.
1005 // [c] Points into an object Y which is inside mapped static archive:
1006 // - This happens only during dynamic dump
1007 // - Adjust this pointer by _mapped_to_requested_static_archive_delta,
1008 // so it points to Y when the static archive is mapped at the requested location.
1009 template <bool STATIC_DUMP>
1010 class RelocateBufferToRequested : public BitMapClosure {
1011 ArchiveBuilder* _builder;
1012 address _buffer_bottom;
1013 intx _buffer_to_requested_delta;
1014 intx _mapped_to_requested_static_archive_delta;
1015 size_t _max_non_null_offset;
1016
1017 public:
1018 RelocateBufferToRequested(ArchiveBuilder* builder) {
1019 _builder = builder;
1020 _buffer_bottom = _builder->buffer_bottom();
1021 _buffer_to_requested_delta = builder->buffer_to_requested_delta();
1022 _mapped_to_requested_static_archive_delta = builder->requested_static_archive_bottom() - builder->mapped_static_archive_bottom();
1023 _max_non_null_offset = 0;
1024
1025 address bottom = _builder->buffer_bottom();
1026 address top = _builder->buffer_top();
1027 address new_bottom = bottom + _buffer_to_requested_delta;
1028 address new_top = top + _buffer_to_requested_delta;
1029 log_debug(cds)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT "] to "
1030 "[" INTPTR_FORMAT " - " INTPTR_FORMAT "]",
1031 p2i(bottom), p2i(top),
1032 p2i(new_bottom), p2i(new_top));
1033 }
1034
1035 bool do_bit(size_t offset) {
1036 address* p = (address*)_buffer_bottom + offset;
1037 assert(_builder->is_in_buffer_space(p), "pointer must live in buffer space");
1038
1039 if (*p == nullptr) {
1040 // todo -- clear bit, etc
1041 ArchivePtrMarker::ptrmap()->clear_bit(offset);
1042 } else {
1043 if (STATIC_DUMP) {
1044 assert(_builder->is_in_buffer_space(*p), "old pointer must point inside buffer space");
1045 *p += _buffer_to_requested_delta;
1046 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1047 } else {
1048 if (_builder->is_in_buffer_space(*p)) {
1049 *p += _buffer_to_requested_delta;
1050 // assert is in requested dynamic archive
1051 } else {
1052 assert(_builder->is_in_mapped_static_archive(*p), "old pointer must point inside buffer space or mapped static archive");
1053 *p += _mapped_to_requested_static_archive_delta;
1054 assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1055 }
1056 }
1057 _max_non_null_offset = offset;
1058 }
1059
1060 return true; // keep iterating
1061 }
1062
1063 void doit() {
1064 ArchivePtrMarker::ptrmap()->iterate(this);
1065 ArchivePtrMarker::compact(_max_non_null_offset);
1066 }
1067 };
1068
1069 #ifdef _LP64
1070 int ArchiveBuilder::precomputed_narrow_klass_shift() {
1071 // Legacy Mode:
1072 // We use 32 bits for narrowKlass, which should cover the full 4G Klass range. Shift can be 0.
1073 // CompactObjectHeader Mode:
1074 // narrowKlass is much smaller, and we use the highest possible shift value to later get the maximum
1075 // Klass encoding range.
1076 //
1077 // Note that all of this may change in the future, if we decide to correct the pre-calculated
1078 // narrow Klass IDs at archive load time.
1079 assert(UseCompressedClassPointers, "Only needed for compressed class pointers");
1080 return UseCompactObjectHeaders ? CompressedKlassPointers::max_shift() : 0;
1081 }
1082 #endif // _LP64
1083
1084 void ArchiveBuilder::relocate_to_requested() {
1085 ro_region()->pack();
1086
1087 size_t my_archive_size = buffer_top() - buffer_bottom();
1088
1089 if (CDSConfig::is_dumping_static_archive()) {
1090 _requested_static_archive_top = _requested_static_archive_bottom + my_archive_size;
1091 RelocateBufferToRequested<true> patcher(this);
1092 patcher.doit();
1093 } else {
1094 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1095 _requested_dynamic_archive_top = _requested_dynamic_archive_bottom + my_archive_size;
1096 RelocateBufferToRequested<false> patcher(this);
1097 patcher.doit();
1098 }
1099 }
1100
1101 // Write detailed info to a mapfile to analyze contents of the archive.
1102 // static dump:
1103 // java -Xshare:dump -Xlog:cds+map=trace:file=cds.map:none:filesize=0
1104 // dynamic dump:
1105 // java -cp MyApp.jar -XX:ArchiveClassesAtExit=MyApp.jsa \
1106 // -Xlog:cds+map=trace:file=cds.map:none:filesize=0 MyApp
1107 //
1108 // We need to do some address translation because the buffers used at dump time may be mapped to
1109 // a different location at runtime. At dump time, the buffers may be at arbitrary locations
1110 // picked by the OS. At runtime, we try to map at a fixed location (SharedBaseAddress). For
1111 // consistency, we log everything using runtime addresses.
1112 class ArchiveBuilder::CDSMapLogger : AllStatic {
1113 static intx buffer_to_runtime_delta() {
1114 // Translate the buffers used by the RW/RO regions to their eventual (requested) locations
1115 // at runtime.
1116 return ArchiveBuilder::current()->buffer_to_requested_delta();
1117 }
1118
1119 // rw/ro regions only
1120 static void log_metaspace_region(const char* name, DumpRegion* region,
1121 const ArchiveBuilder::SourceObjList* src_objs) {
1122 address region_base = address(region->base());
1123 address region_top = address(region->top());
1124 log_region(name, region_base, region_top, region_base + buffer_to_runtime_delta());
1125 log_metaspace_objects(region, src_objs);
1126 }
1127
1128 #define _LOG_PREFIX PTR_FORMAT ": @@ %-17s %d"
1129
1130 static void log_klass(Klass* k, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1131 ResourceMark rm(current);
1132 log_debug(cds, map)(_LOG_PREFIX " %s",
1133 p2i(runtime_dest), type_name, bytes, k->external_name());
1134 }
1135 static void log_method(Method* m, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1136 ResourceMark rm(current);
1137 log_debug(cds, map)(_LOG_PREFIX " %s",
1138 p2i(runtime_dest), type_name, bytes, m->external_name());
1139 }
1140
1141 // rw/ro regions only
1142 static void log_metaspace_objects(DumpRegion* region, const ArchiveBuilder::SourceObjList* src_objs) {
1143 address last_obj_base = address(region->base());
1144 address last_obj_end = address(region->base());
1145 address region_end = address(region->end());
1146 Thread* current = Thread::current();
1147 for (int i = 0; i < src_objs->objs()->length(); i++) {
1148 SourceObjInfo* src_info = src_objs->at(i);
1149 address src = src_info->source_addr();
1150 address dest = src_info->buffered_addr();
1151 log_as_hex(last_obj_base, dest, last_obj_base + buffer_to_runtime_delta());
1152 address runtime_dest = dest + buffer_to_runtime_delta();
1153 int bytes = src_info->size_in_bytes();
1154
1155 MetaspaceObj::Type type = src_info->msotype();
1156 const char* type_name = MetaspaceObj::type_name(type);
1157
1158 switch (type) {
1159 case MetaspaceObj::ClassType:
1160 log_klass((Klass*)src, runtime_dest, type_name, bytes, current);
1161 break;
1162 case MetaspaceObj::ConstantPoolType:
1163 log_klass(((ConstantPool*)src)->pool_holder(),
1164 runtime_dest, type_name, bytes, current);
1165 break;
1166 case MetaspaceObj::ConstantPoolCacheType:
1167 log_klass(((ConstantPoolCache*)src)->constant_pool()->pool_holder(),
1168 runtime_dest, type_name, bytes, current);
1169 break;
1170 case MetaspaceObj::MethodType:
1171 log_method((Method*)src, runtime_dest, type_name, bytes, current);
1172 break;
1173 case MetaspaceObj::ConstMethodType:
1174 log_method(((ConstMethod*)src)->method(), runtime_dest, type_name, bytes, current);
1175 break;
1176 case MetaspaceObj::SymbolType:
1177 {
1178 ResourceMark rm(current);
1179 Symbol* s = (Symbol*)src;
1180 log_debug(cds, map)(_LOG_PREFIX " %s", p2i(runtime_dest), type_name, bytes,
1181 s->as_quoted_ascii());
1182 }
1183 break;
1184 default:
1185 log_debug(cds, map)(_LOG_PREFIX, p2i(runtime_dest), type_name, bytes);
1186 break;
1187 }
1188
1189 last_obj_base = dest;
1190 last_obj_end = dest + bytes;
1191 }
1192
1193 log_as_hex(last_obj_base, last_obj_end, last_obj_base + buffer_to_runtime_delta());
1194 if (last_obj_end < region_end) {
1195 log_debug(cds, map)(PTR_FORMAT ": @@ Misc data %zu bytes",
1196 p2i(last_obj_end + buffer_to_runtime_delta()),
1197 size_t(region_end - last_obj_end));
1198 log_as_hex(last_obj_end, region_end, last_obj_end + buffer_to_runtime_delta());
1199 }
1200 }
1201
1202 #undef _LOG_PREFIX
1203
1204 // Log information about a region, whose address at dump time is [base .. top). At
1205 // runtime, this region will be mapped to requested_base. requested_base is nullptr if this
1206 // region will be mapped at os-selected addresses (such as the bitmap region), or will
1207 // be accessed with os::read (the header).
1208 //
1209 // Note: across -Xshare:dump runs, base may be different, but requested_base should
1210 // be the same as the archive contents should be deterministic.
1211 static void log_region(const char* name, address base, address top, address requested_base) {
1212 size_t size = top - base;
1213 base = requested_base;
1214 if (requested_base == nullptr) {
1215 top = (address)size;
1216 } else {
1217 top = requested_base + size;
1218 }
1219 log_info(cds, map)("[%-18s " PTR_FORMAT " - " PTR_FORMAT " %9zu bytes]",
1220 name, p2i(base), p2i(top), size);
1221 }
1222
1223 #if INCLUDE_CDS_JAVA_HEAP
1224 static void log_heap_region(ArchiveHeapInfo* heap_info) {
1225 MemRegion r = heap_info->buffer_region();
1226 address start = address(r.start()); // start of the current oop inside the buffer
1227 address end = address(r.end());
1228 log_region("heap", start, end, ArchiveHeapWriter::buffered_addr_to_requested_addr(start));
1229
1230 LogStreamHandle(Info, cds, map) st;
1231
1232 HeapRootSegments segments = heap_info->heap_root_segments();
1233 assert(segments.base_offset() == 0, "Sanity");
1234
1235 for (size_t seg_idx = 0; seg_idx < segments.count(); seg_idx++) {
1236 address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1237 st.print_cr(PTR_FORMAT ": Heap roots segment [%d]",
1238 p2i(requested_start), segments.size_in_elems(seg_idx));
1239 start += segments.size_in_bytes(seg_idx);
1240 }
1241 log_heap_roots();
1242
1243 while (start < end) {
1244 size_t byte_size;
1245 oop source_oop = ArchiveHeapWriter::buffered_addr_to_source_obj(start);
1246 address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1247 st.print(PTR_FORMAT ": @@ Object ", p2i(requested_start));
1248
1249 if (source_oop != nullptr) {
1250 // This is a regular oop that got archived.
1251 // Don't print the requested addr again as we have just printed it at the beginning of the line.
1252 // Example:
1253 // 0x00000007ffd27938: @@ Object (0xfffa4f27) java.util.HashMap
1254 print_oop_info_cr(&st, source_oop, /*print_requested_addr=*/false);
1255 size_t old_size = source_oop->size();
1256 size_t new_size = source_oop->copy_size_cds(old_size, source_oop->mark());
1257 byte_size = new_size * BytesPerWord;
1258 } else if ((byte_size = ArchiveHeapWriter::get_filler_size_at(start)) > 0) {
1259 // We have a filler oop, which also does not exist in BufferOffsetToSourceObjectTable.
1260 // Example:
1261 // 0x00000007ffc3ffd8: @@ Object filler 40 bytes
1262 st.print_cr("filler %zu bytes", byte_size);
1263 } else {
1264 ShouldNotReachHere();
1265 }
1266
1267 address oop_end = start + byte_size;
1268 log_as_hex(start, oop_end, requested_start, /*is_heap=*/true);
1269
1270 if (source_oop != nullptr) {
1271 log_oop_details(heap_info, source_oop, /*buffered_addr=*/start);
1272 }
1273 start = oop_end;
1274 }
1275 }
1276
1277 // ArchivedFieldPrinter is used to print the fields of archived objects. We can't
1278 // use _source_obj->print_on(), because we want to print the oop fields
1279 // in _source_obj with their requested addresses using print_oop_info_cr().
1280 class ArchivedFieldPrinter : public FieldClosure {
1281 ArchiveHeapInfo* _heap_info;
1282 outputStream* _st;
1283 oop _source_obj;
1284 address _buffered_addr;
1285 public:
1286 ArchivedFieldPrinter(ArchiveHeapInfo* heap_info, outputStream* st, oop src_obj, address buffered_addr) :
1287 _heap_info(heap_info), _st(st), _source_obj(src_obj), _buffered_addr(buffered_addr) {}
1288
1289 void do_field(fieldDescriptor* fd) {
1290 _st->print(" - ");
1291 BasicType ft = fd->field_type();
1292 switch (ft) {
1293 case T_ARRAY:
1294 case T_OBJECT:
1295 {
1296 fd->print_on(_st); // print just the name and offset
1297 oop obj = _source_obj->obj_field(fd->offset());
1298 if (java_lang_Class::is_instance(obj)) {
1299 obj = HeapShared::scratch_java_mirror(obj);
1300 }
1301 print_oop_info_cr(_st, obj);
1302 }
1303 break;
1304 default:
1305 if (ArchiveHeapWriter::is_marked_as_native_pointer(_heap_info, _source_obj, fd->offset())) {
1306 print_as_native_pointer(fd);
1307 } else {
1308 fd->print_on_for(_st, cast_to_oop(_buffered_addr)); // name, offset, value
1309 _st->cr();
1310 }
1311 }
1312 }
1313
1314 void print_as_native_pointer(fieldDescriptor* fd) {
1315 LP64_ONLY(assert(fd->field_type() == T_LONG, "must be"));
1316 NOT_LP64 (assert(fd->field_type() == T_INT, "must be"));
1317
1318 // We have a field that looks like an integer, but it's actually a pointer to a MetaspaceObj.
1319 address source_native_ptr = (address)
1320 LP64_ONLY(_source_obj->long_field(fd->offset()))
1321 NOT_LP64( _source_obj->int_field (fd->offset()));
1322 ArchiveBuilder* builder = ArchiveBuilder::current();
1323
1324 // The value of the native pointer at runtime.
1325 address requested_native_ptr = builder->to_requested(builder->get_buffered_addr(source_native_ptr));
1326
1327 // The address of _source_obj at runtime
1328 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(_source_obj);
1329 // The address of this field in the requested space
1330 assert(requested_obj != nullptr, "Attempting to load field from null oop");
1331 address requested_field_addr = cast_from_oop<address>(requested_obj) + fd->offset();
1332
1333 fd->print_on(_st);
1334 _st->print_cr(PTR_FORMAT " (marked metadata pointer @" PTR_FORMAT " )",
1335 p2i(requested_native_ptr), p2i(requested_field_addr));
1336 }
1337 };
1338
1339 // Print the fields of instanceOops, or the elements of arrayOops
1340 static void log_oop_details(ArchiveHeapInfo* heap_info, oop source_oop, address buffered_addr) {
1341 LogStreamHandle(Trace, cds, map, oops) st;
1342 if (st.is_enabled()) {
1343 Klass* source_klass = source_oop->klass();
1344 ArchiveBuilder* builder = ArchiveBuilder::current();
1345 Klass* requested_klass = builder->to_requested(builder->get_buffered_addr(source_klass));
1346
1347 st.print(" - klass: ");
1348 source_klass->print_value_on(&st);
1349 st.print(" " PTR_FORMAT, p2i(requested_klass));
1350 st.cr();
1351
1352 if (source_oop->is_typeArray()) {
1353 TypeArrayKlass::cast(source_klass)->oop_print_elements_on(typeArrayOop(source_oop), &st);
1354 } else if (source_oop->is_objArray()) {
1355 objArrayOop source_obj_array = objArrayOop(source_oop);
1356 for (int i = 0; i < source_obj_array->length(); i++) {
1357 st.print(" -%4d: ", i);
1358 oop obj = source_obj_array->obj_at(i);
1359 if (java_lang_Class::is_instance(obj)) {
1360 obj = HeapShared::scratch_java_mirror(obj);
1361 }
1362 print_oop_info_cr(&st, obj);
1363 }
1364 } else {
1365 st.print_cr(" - fields (%zu words):", source_oop->size());
1366 ArchivedFieldPrinter print_field(heap_info, &st, source_oop, buffered_addr);
1367 InstanceKlass::cast(source_klass)->print_nonstatic_fields(&print_field);
1368
1369 if (java_lang_Class::is_instance(source_oop)) {
1370 oop scratch_mirror = source_oop;
1371 st.print(" - signature: ");
1372 print_class_signature_for_mirror(&st, scratch_mirror);
1373 st.cr();
1374
1375 Klass* src_klass = java_lang_Class::as_Klass(scratch_mirror);
1376 if (src_klass != nullptr && src_klass->is_instance_klass()) {
1377 oop rr = HeapShared::scratch_resolved_references(InstanceKlass::cast(src_klass)->constants());
1378 st.print(" - archived_resolved_references: ");
1379 print_oop_info_cr(&st, rr);
1380
1381 // We need to print the fields in the scratch_mirror, not the original mirror.
1382 // (if a class is not aot-initialized, static fields in its scratch mirror will be cleared).
1383 assert(scratch_mirror == HeapShared::scratch_java_mirror(src_klass->java_mirror()), "sanity");
1384 st.print_cr("- ---- static fields (%d):", java_lang_Class::static_oop_field_count(scratch_mirror));
1385 InstanceKlass::cast(src_klass)->do_local_static_fields(&print_field);
1386 }
1387 }
1388 }
1389 }
1390 }
1391
1392 static void print_class_signature_for_mirror(outputStream* st, oop scratch_mirror) {
1393 assert(java_lang_Class::is_instance(scratch_mirror), "sanity");
1394 if (java_lang_Class::is_primitive(scratch_mirror)) {
1395 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
1396 BasicType bt = (BasicType)i;
1397 if (!is_reference_type(bt) && scratch_mirror == HeapShared::scratch_java_mirror(bt)) {
1398 oop orig_mirror = Universe::java_mirror(bt);
1399 java_lang_Class::print_signature(orig_mirror, st);
1400 return;
1401 }
1402 }
1403 ShouldNotReachHere();
1404 }
1405 java_lang_Class::print_signature(scratch_mirror, st);
1406 }
1407
1408 static void log_heap_roots() {
1409 LogStreamHandle(Trace, cds, map, oops) st;
1410 if (st.is_enabled()) {
1411 for (int i = 0; i < HeapShared::pending_roots()->length(); i++) {
1412 st.print("roots[%4d]: ", i);
1413 print_oop_info_cr(&st, HeapShared::pending_roots()->at(i));
1414 }
1415 }
1416 }
1417
1418 // Example output:
1419 // - The first number is the requested address (if print_requested_addr == true)
1420 // - The second number is the narrowOop version of the requested address (if UseCompressedOops == true)
1421 // 0x00000007ffc7e840 (0xfff8fd08) java.lang.Class Ljava/util/Array;
1422 // 0x00000007ffc000f8 (0xfff8001f) [B length: 11
1423 static void print_oop_info_cr(outputStream* st, oop source_oop, bool print_requested_addr = true) {
1424 if (source_oop == nullptr) {
1425 st->print_cr("null");
1426 } else {
1427 ResourceMark rm;
1428 oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(source_oop);
1429 if (print_requested_addr) {
1430 st->print(PTR_FORMAT " ", p2i(requested_obj));
1431 }
1432 if (UseCompressedOops) {
1433 st->print("(0x%08x) ", CompressedOops::narrow_oop_value(requested_obj));
1434 }
1435 if (source_oop->is_array()) {
1436 int array_len = arrayOop(source_oop)->length();
1437 st->print_cr("%s length: %d", source_oop->klass()->external_name(), array_len);
1438 } else {
1439 st->print("%s", source_oop->klass()->external_name());
1440
1441 if (java_lang_String::is_instance(source_oop)) {
1442 st->print(" ");
1443 java_lang_String::print(source_oop, st);
1444 } else if (java_lang_Class::is_instance(source_oop)) {
1445 oop scratch_mirror = source_oop;
1446
1447 st->print(" ");
1448 print_class_signature_for_mirror(st, scratch_mirror);
1449
1450 Klass* src_klass = java_lang_Class::as_Klass(scratch_mirror);
1451 if (src_klass != nullptr && src_klass->is_instance_klass()) {
1452 InstanceKlass* buffered_klass =
1453 ArchiveBuilder::current()->get_buffered_addr(InstanceKlass::cast(src_klass));
1454 if (buffered_klass->has_aot_initialized_mirror()) {
1455 st->print(" (aot-inited)");
1456 }
1457 }
1458 }
1459 st->cr();
1460 }
1461 }
1462 }
1463 #endif // INCLUDE_CDS_JAVA_HEAP
1464
1465 // Log all the data [base...top). Pretend that the base address
1466 // will be mapped to requested_base at run-time.
1467 static void log_as_hex(address base, address top, address requested_base, bool is_heap = false) {
1468 assert(top >= base, "must be");
1469
1470 LogStreamHandle(Trace, cds, map) lsh;
1471 if (lsh.is_enabled()) {
1472 int unitsize = sizeof(address);
1473 if (is_heap && UseCompressedOops) {
1474 // This makes the compressed oop pointers easier to read, but
1475 // longs and doubles will be split into two words.
1476 unitsize = sizeof(narrowOop);
1477 }
1478 os::print_hex_dump(&lsh, base, top, unitsize, /* print_ascii=*/true, /* bytes_per_line=*/32, requested_base);
1479 }
1480 }
1481
1482 static void log_header(FileMapInfo* mapinfo) {
1483 LogStreamHandle(Info, cds, map) lsh;
1484 if (lsh.is_enabled()) {
1485 mapinfo->print(&lsh);
1486 }
1487 }
1488
1489 public:
1490 static void log(ArchiveBuilder* builder, FileMapInfo* mapinfo,
1491 ArchiveHeapInfo* heap_info,
1492 char* bitmap, size_t bitmap_size_in_bytes) {
1493 log_info(cds, map)("%s CDS archive map for %s", CDSConfig::is_dumping_static_archive() ? "Static" : "Dynamic", mapinfo->full_path());
1494
1495 address header = address(mapinfo->header());
1496 address header_end = header + mapinfo->header()->header_size();
1497 log_region("header", header, header_end, nullptr);
1498 log_header(mapinfo);
1499 log_as_hex(header, header_end, nullptr);
1500
1501 DumpRegion* rw_region = &builder->_rw_region;
1502 DumpRegion* ro_region = &builder->_ro_region;
1503
1504 log_metaspace_region("rw region", rw_region, &builder->_rw_src_objs);
1505 log_metaspace_region("ro region", ro_region, &builder->_ro_src_objs);
1506
1507 address bitmap_end = address(bitmap + bitmap_size_in_bytes);
1508 log_region("bitmap", address(bitmap), bitmap_end, nullptr);
1509 log_as_hex((address)bitmap, bitmap_end, nullptr);
1510
1511 #if INCLUDE_CDS_JAVA_HEAP
1512 if (heap_info->is_used()) {
1513 log_heap_region(heap_info);
1514 }
1515 #endif
1516
1517 log_info(cds, map)("[End of CDS archive map]");
1518 }
1519 }; // end ArchiveBuilder::CDSMapLogger
1520
1521 void ArchiveBuilder::print_stats() {
1522 _alloc_stats.print_stats(int(_ro_region.used()), int(_rw_region.used()));
1523 }
1524
1525 void ArchiveBuilder::write_archive(FileMapInfo* mapinfo, ArchiveHeapInfo* heap_info) {
1526 // Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
1527 // MetaspaceShared::n_regions (internal to hotspot).
1528 assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
1529
1530 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1531 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1532
1533 // Split pointer map into read-write and read-only bitmaps
1534 ArchivePtrMarker::initialize_rw_ro_maps(&_rw_ptrmap, &_ro_ptrmap);
1535
1536 size_t bitmap_size_in_bytes;
1537 char* bitmap = mapinfo->write_bitmap_region(ArchivePtrMarker::rw_ptrmap(), ArchivePtrMarker::ro_ptrmap(), heap_info,
1538 bitmap_size_in_bytes);
1539
1540 if (heap_info->is_used()) {
1541 _total_heap_region_size = mapinfo->write_heap_region(heap_info);
1542 }
1543
1544 print_region_stats(mapinfo, heap_info);
1545
1546 mapinfo->set_requested_base((char*)MetaspaceShared::requested_base_address());
1547 mapinfo->set_header_crc(mapinfo->compute_header_crc());
1548 // After this point, we should not write any data into mapinfo->header() since this
1549 // would corrupt its checksum we have calculated before.
1550 mapinfo->write_header();
1551 mapinfo->close();
1552
1553 if (log_is_enabled(Info, cds)) {
1554 log_info(cds)("Full module graph = %s", CDSConfig::is_dumping_full_module_graph() ? "enabled" : "disabled");
1555 print_stats();
1556 }
1557
1558 if (log_is_enabled(Info, cds, map)) {
1559 CDSMapLogger::log(this, mapinfo, heap_info,
1560 bitmap, bitmap_size_in_bytes);
1561 }
1562 CDS_JAVA_HEAP_ONLY(HeapShared::destroy_archived_object_cache());
1563 FREE_C_HEAP_ARRAY(char, bitmap);
1564 }
1565
1566 void ArchiveBuilder::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only, bool allow_exec) {
1567 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1568 }
1569
1570 void ArchiveBuilder::print_region_stats(FileMapInfo *mapinfo, ArchiveHeapInfo* heap_info) {
1571 // Print statistics of all the regions
1572 const size_t bitmap_used = mapinfo->region_at(MetaspaceShared::bm)->used();
1573 const size_t bitmap_reserved = mapinfo->region_at(MetaspaceShared::bm)->used_aligned();
1574 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
1575 bitmap_reserved +
1576 _total_heap_region_size;
1577 const size_t total_bytes = _ro_region.used() + _rw_region.used() +
1578 bitmap_used +
1579 _total_heap_region_size;
1580 const double total_u_perc = percent_of(total_bytes, total_reserved);
1581
1582 _rw_region.print(total_reserved);
1583 _ro_region.print(total_reserved);
1584
1585 print_bitmap_region_stats(bitmap_used, total_reserved);
1586
1587 if (heap_info->is_used()) {
1588 print_heap_region_stats(heap_info, total_reserved);
1589 }
1590
1591 log_debug(cds)("total : %9zu [100.0%% of total] out of %9zu bytes [%5.1f%% used]",
1592 total_bytes, total_reserved, total_u_perc);
1593 }
1594
1595 void ArchiveBuilder::print_bitmap_region_stats(size_t size, size_t total_size) {
1596 log_debug(cds)("bm space: %9zu [ %4.1f%% of total] out of %9zu bytes [100.0%% used]",
1597 size, size/double(total_size)*100.0, size);
1598 }
1599
1600 void ArchiveBuilder::print_heap_region_stats(ArchiveHeapInfo *info, size_t total_size) {
1601 char* start = info->buffer_start();
1602 size_t size = info->buffer_byte_size();
1603 char* top = start + size;
1604 log_debug(cds)("hp space: %9zu [ %4.1f%% of total] out of %9zu bytes [100.0%% used] at " INTPTR_FORMAT,
1605 size, size/double(total_size)*100.0, size, p2i(start));
1606 }
1607
1608 void ArchiveBuilder::report_out_of_space(const char* name, size_t needed_bytes) {
1609 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
1610 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
1611 // or so.
1612 _rw_region.print_out_of_space_msg(name, needed_bytes);
1613 _ro_region.print_out_of_space_msg(name, needed_bytes);
1614
1615 log_error(cds)("Unable to allocate from '%s' region: Please reduce the number of shared classes.", name);
1616 MetaspaceShared::unrecoverable_writing_error();
1617 }