1 /*
   2  * Copyright (c) 2020, 2023, 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/cppVtables.hpp"
  32 #include "cds/dumpAllocStats.hpp"
  33 #include "cds/dynamicArchive.hpp"
  34 #include "cds/heapShared.hpp"
  35 #include "cds/metaspaceShared.hpp"
  36 #include "cds/regeneratedClasses.hpp"
  37 #include "classfile/classLoader.hpp"
  38 #include "classfile/classLoaderDataShared.hpp"
  39 #include "classfile/javaClasses.hpp"
  40 #include "classfile/symbolTable.hpp"
  41 #include "classfile/systemDictionaryShared.hpp"
  42 #include "classfile/vmClasses.hpp"
  43 #include "interpreter/abstractInterpreter.hpp"
  44 #include "logging/log.hpp"
  45 #include "logging/logStream.hpp"
  46 #include "memory/allStatic.hpp"
  47 #include "memory/memRegion.hpp"
  48 #include "memory/resourceArea.hpp"
  49 #include "oops/compressedKlass.inline.hpp"
  50 #include "oops/instanceKlass.hpp"
  51 #include "oops/objArrayKlass.hpp"
  52 #include "oops/objArrayOop.inline.hpp"
  53 #include "oops/oopHandle.inline.hpp"
  54 #include "oops/trainingData.hpp"
  55 #include "runtime/arguments.hpp"
  56 #include "runtime/fieldDescriptor.inline.hpp"
  57 #include "runtime/globals_extension.hpp"
  58 #include "runtime/javaThread.hpp"
  59 #include "runtime/sharedRuntime.hpp"
  60 #include "utilities/align.hpp"
  61 #include "utilities/bitMap.inline.hpp"
  62 #include "utilities/formatBuffer.hpp"
  63 
  64 ArchiveBuilder* ArchiveBuilder::_current = nullptr;
  65 
  66 ArchiveBuilder::OtherROAllocMark::~OtherROAllocMark() {
  67   char* newtop = ArchiveBuilder::current()->_ro_region.top();
  68   ArchiveBuilder::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
  69 }
  70 
  71 ArchiveBuilder::SourceObjList::SourceObjList() : _ptrmap(16 * K, mtClassShared) {
  72   _total_bytes = 0;
  73   _objs = new (mtClassShared) GrowableArray<SourceObjInfo*>(128 * K, mtClassShared);
  74 }
  75 
  76 ArchiveBuilder::SourceObjList::~SourceObjList() {
  77   delete _objs;
  78 }
  79 
  80 void ArchiveBuilder::SourceObjList::append(SourceObjInfo* src_info) {
  81   // Save this source object for copying
  82   _objs->append(src_info);
  83 
  84   // Prepare for marking the pointers in this source object
  85   assert(is_aligned(_total_bytes, sizeof(address)), "must be");
  86   src_info->set_ptrmap_start(_total_bytes / sizeof(address));
  87   _total_bytes = align_up(_total_bytes + (uintx)src_info->size_in_bytes(), sizeof(address));
  88   src_info->set_ptrmap_end(_total_bytes / sizeof(address));
  89 
  90   BitMap::idx_t bitmap_size_needed = BitMap::idx_t(src_info->ptrmap_end());
  91   if (_ptrmap.size() <= bitmap_size_needed) {
  92     _ptrmap.resize((bitmap_size_needed + 1) * 2);
  93   }
  94 }
  95 
  96 void ArchiveBuilder::SourceObjList::remember_embedded_pointer(SourceObjInfo* src_info, MetaspaceClosure::Ref* ref) {
  97   // src_obj contains a pointer. Remember the location of this pointer in _ptrmap,
  98   // so that we can copy/relocate it later.
  99   address src_obj = src_info->source_addr();
 100   address* field_addr = ref->addr();
 101   assert(src_info->ptrmap_start() < _total_bytes, "sanity");
 102   assert(src_info->ptrmap_end() <= _total_bytes, "sanity");
 103   assert(*field_addr != nullptr, "should have checked");
 104 
 105   intx field_offset_in_bytes = ((address)field_addr) - src_obj;
 106   DEBUG_ONLY(int src_obj_size = src_info->size_in_bytes();)
 107   assert(field_offset_in_bytes >= 0, "must be");
 108   assert(field_offset_in_bytes + intx(sizeof(intptr_t)) <= intx(src_obj_size), "must be");
 109   assert(is_aligned(field_offset_in_bytes, sizeof(address)), "must be");
 110 
 111   BitMap::idx_t idx = BitMap::idx_t(src_info->ptrmap_start() + (uintx)(field_offset_in_bytes / sizeof(address)));
 112   _ptrmap.set_bit(BitMap::idx_t(idx));
 113 }
 114 
 115 class RelocateEmbeddedPointers : public BitMapClosure {
 116   ArchiveBuilder* _builder;
 117   address _buffered_obj;
 118   BitMap::idx_t _start_idx;
 119 public:
 120   RelocateEmbeddedPointers(ArchiveBuilder* builder, address buffered_obj, BitMap::idx_t start_idx) :
 121     _builder(builder), _buffered_obj(buffered_obj), _start_idx(start_idx) {}
 122 
 123   bool do_bit(BitMap::idx_t bit_offset) {
 124     size_t field_offset = size_t(bit_offset - _start_idx) * sizeof(address);
 125     address* ptr_loc = (address*)(_buffered_obj + field_offset);
 126 
 127     address old_p = *ptr_loc;
 128     address new_p = _builder->get_buffered_addr(old_p);
 129 
 130     log_trace(cds)("Ref: [" PTR_FORMAT "] -> " PTR_FORMAT " => " PTR_FORMAT,
 131                    p2i(ptr_loc), p2i(old_p), p2i(new_p));
 132 
 133     ArchivePtrMarker::set_and_mark_pointer(ptr_loc, new_p);
 134     return true; // keep iterating the bitmap
 135   }
 136 };
 137 
 138 void ArchiveBuilder::SourceObjList::relocate(int i, ArchiveBuilder* builder) {
 139   SourceObjInfo* src_info = objs()->at(i);
 140   assert(src_info->should_copy(), "must be");
 141   BitMap::idx_t start = BitMap::idx_t(src_info->ptrmap_start()); // inclusive
 142   BitMap::idx_t end = BitMap::idx_t(src_info->ptrmap_end());     // exclusive
 143 
 144   RelocateEmbeddedPointers relocator(builder, src_info->buffered_addr(), start);
 145   _ptrmap.iterate(&relocator, start, end);
 146 }
 147 
 148 ArchiveBuilder::ArchiveBuilder() :
 149   _current_dump_space(nullptr),
 150   _buffer_bottom(nullptr),
 151   _last_verified_top(nullptr),
 152   _num_dump_regions_used(0),
 153   _other_region_used_bytes(0),
 154   _requested_static_archive_bottom(nullptr),
 155   _requested_static_archive_top(nullptr),
 156   _requested_dynamic_archive_bottom(nullptr),
 157   _requested_dynamic_archive_top(nullptr),
 158   _mapped_static_archive_bottom(nullptr),
 159   _mapped_static_archive_top(nullptr),
 160   _buffer_to_requested_delta(0),
 161   _rw_region("rw", MAX_SHARED_DELTA),
 162   _ro_region("ro", MAX_SHARED_DELTA),
 163   _cc_region("cc", MAX_SHARED_DELTA),
 164   _ptrmap(mtClassShared),
 165   _rw_src_objs(),
 166   _ro_src_objs(),
 167   _src_obj_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
 168   _buffered_to_src_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
 169   _total_heap_region_size(0),
 170   _estimated_metaspaceobj_bytes(0),
 171   _estimated_hashtable_bytes(0)
 172 {
 173   _klasses = new (mtClassShared) GrowableArray<Klass*>(4 * K, mtClassShared);
 174   _symbols = new (mtClassShared) GrowableArray<Symbol*>(256 * K, mtClassShared);
 175 
 176   assert(_current == nullptr, "must be");
 177   _current = this;
 178 }
 179 
 180 ArchiveBuilder::~ArchiveBuilder() {
 181   assert(_current == this, "must be");
 182   _current = nullptr;
 183 
 184   for (int i = 0; i < _symbols->length(); i++) {
 185     _symbols->at(i)->decrement_refcount();
 186   }
 187 
 188   delete _klasses;
 189   delete _symbols;
 190   if (_shared_rs.is_reserved()) {
 191     _shared_rs.release();
 192   }
 193 }
 194 
 195 class GatherKlassesAndSymbols : public UniqueMetaspaceClosure {
 196   ArchiveBuilder* _builder;
 197 
 198 public:
 199   GatherKlassesAndSymbols(ArchiveBuilder* builder) : _builder(builder) {}
 200 
 201   virtual bool do_unique_ref(Ref* ref, bool read_only) {
 202     return _builder->gather_klass_and_symbol(ref, read_only);
 203   }
 204 };
 205 
 206 bool ArchiveBuilder::gather_klass_and_symbol(MetaspaceClosure::Ref* ref, bool read_only) {
 207   if (ref->obj() == nullptr) {
 208     return false;
 209   }
 210   if (get_follow_mode(ref) != make_a_copy) {
 211     return false;
 212   }
 213   if (ref->msotype() == MetaspaceObj::ClassType) {
 214     Klass* klass = (Klass*)ref->obj();
 215     assert(klass->is_klass(), "must be");
 216     if (!is_excluded(klass)) {
 217       _klasses->append(klass);
 218       if (klass->is_hidden() && klass->is_instance_klass()) {
 219         update_hidden_class_loader_type(InstanceKlass::cast(klass));
 220       }
 221     }
 222     // See RunTimeClassInfo::get_for()
 223     _estimated_metaspaceobj_bytes += align_up(BytesPerWord, SharedSpaceObjectAlignment);
 224   } else if (ref->msotype() == MetaspaceObj::SymbolType) {
 225     // Make sure the symbol won't be GC'ed while we are dumping the archive.
 226     Symbol* sym = (Symbol*)ref->obj();
 227     sym->increment_refcount();
 228     _symbols->append(sym);
 229   }
 230 
 231   int bytes = ref->size() * BytesPerWord;
 232   _estimated_metaspaceobj_bytes += align_up(bytes, SharedSpaceObjectAlignment);
 233 
 234   return true; // recurse
 235 }
 236 
 237 void ArchiveBuilder::gather_klasses_and_symbols() {
 238   ResourceMark rm;
 239   log_info(cds)("Gathering classes and symbols ... ");
 240   GatherKlassesAndSymbols doit(this);
 241   iterate_roots(&doit);
 242 #if INCLUDE_CDS_JAVA_HEAP
 243   if (CDSConfig::is_dumping_full_module_graph()) {
 244     ClassLoaderDataShared::iterate_symbols(&doit);
 245   }
 246 #endif
 247   doit.finish();
 248 
 249   if (CDSConfig::is_dumping_static_archive()) {
 250     // To ensure deterministic contents in the static archive, we need to ensure that
 251     // we iterate the MetaspaceObjs in a deterministic order. It doesn't matter where
 252     // the MetaspaceObjs are located originally, as they are copied sequentially into
 253     // the archive during the iteration.
 254     //
 255     // The only issue here is that the symbol table and the system directories may be
 256     // randomly ordered, so we copy the symbols and klasses into two arrays and sort
 257     // them deterministically.
 258     //
 259     // During -Xshare:dump, the order of Symbol creation is strictly determined by
 260     // the SharedClassListFile (class loading is done in a single thread and the JIT
 261     // is disabled). Also, Symbols are allocated in monotonically increasing addresses
 262     // (see Symbol::operator new(size_t, int)). So if we iterate the Symbols by
 263     // ascending address order, we ensure that all Symbols are copied into deterministic
 264     // locations in the archive.
 265     //
 266     // TODO: in the future, if we want to produce deterministic contents in the
 267     // dynamic archive, we might need to sort the symbols alphabetically (also see
 268     // DynamicArchiveBuilder::sort_methods()).
 269     log_info(cds)("Sorting symbols ... ");
 270     _symbols->sort(compare_symbols_by_address);
 271     sort_klasses();
 272 
 273     // TODO -- we need a proper estimate for the archived modules, etc,
 274     // but this should be enough for now
 275     _estimated_metaspaceobj_bytes += 200 * 1024 * 1024;
 276   }
 277 }
 278 
 279 #if INCLUDE_CDS_JAVA_HEAP
 280 
 281 void ArchiveBuilder::update_hidden_class_loader_type(InstanceKlass* ik) {
 282   s2 classloader_type;
 283   if (HeapShared::is_lambda_form_klass(ik)) {
 284     assert(CDSConfig::is_dumping_invokedynamic(), "lambda form classes are archived only if ArchiveInvokeDynamic is true");
 285     classloader_type = ClassLoader::BOOT_LOADER;
 286   } else if (HeapShared::is_lambda_proxy_klass(ik)) {
 287     oop loader = ik->class_loader();
 288 
 289     if (loader == nullptr) {
 290       classloader_type = ClassLoader::BOOT_LOADER;
 291     } else if (SystemDictionary::is_platform_class_loader(loader)) {
 292       classloader_type = ClassLoader::PLATFORM_LOADER;
 293     } else if (SystemDictionary::is_system_class_loader(loader)) {
 294       classloader_type = ClassLoader::APP_LOADER;
 295     } else {
 296       ShouldNotReachHere();
 297     }
 298   } else {
 299     ShouldNotReachHere();
 300   }
 301 
 302   ik->set_shared_class_loader_type(classloader_type);
 303   if (HeapShared::is_lambda_proxy_klass(ik)) {
 304     InstanceKlass* nest_host = ik->nest_host_not_null();
 305     ik->set_shared_classpath_index(nest_host->shared_classpath_index());
 306   }
 307 }
 308 
 309 #endif //INCLUDE_CDS_JAVA_HEAP
 310 
 311 int ArchiveBuilder::compare_symbols_by_address(Symbol** a, Symbol** b) {
 312   if (a[0] < b[0]) {
 313     return -1;
 314   } else {
 315     assert(a[0] > b[0], "Duplicated symbol %s unexpected", (*a)->as_C_string());
 316     return 1;
 317   }
 318 }
 319 
 320 int ArchiveBuilder::compare_klass_by_name(Klass** a, Klass** b) {
 321   return a[0]->name()->fast_compare(b[0]->name());
 322 }
 323 
 324 void ArchiveBuilder::sort_klasses() {
 325   log_info(cds)("Sorting classes ... ");
 326   _klasses->sort(compare_klass_by_name);
 327 }
 328 
 329 size_t ArchiveBuilder::estimate_archive_size() {
 330   // size of the symbol table and two dictionaries, plus the RunTimeClassInfo's
 331   size_t symbol_table_est = SymbolTable::estimate_size_for_archive();
 332   size_t dictionary_est = SystemDictionaryShared::estimate_size_for_archive();
 333   size_t training_data_est = TrainingData::estimate_size_for_archive();
 334   _estimated_hashtable_bytes = symbol_table_est + dictionary_est + training_data_est;
 335 
 336   if (CDSConfig::is_dumping_final_static_archive()) {
 337     _estimated_hashtable_bytes += 200 * 1024 * 1024; // FIXME -- need to iterate archived symbols??
 338   }
 339 
 340   if (CDSConfig::is_dumping_dynamic_archive()) {
 341     // Some extra space for traning data. Be generous. Unused areas will be trimmed from the archive file.
 342     _estimated_hashtable_bytes += 200 * 1024 * 1024;
 343   }
 344   size_t total = 0;
 345 
 346   total += _estimated_metaspaceobj_bytes;
 347   total += _estimated_hashtable_bytes;
 348 
 349   // allow fragmentation at the end of each dump region
 350   total += _total_dump_regions * MetaspaceShared::core_region_alignment();
 351 
 352   log_info(cds)("_estimated_hashtable_bytes = " SIZE_FORMAT " + " SIZE_FORMAT " = " SIZE_FORMAT,
 353                 symbol_table_est, dictionary_est, _estimated_hashtable_bytes);
 354   log_info(cds)("_estimated_metaspaceobj_bytes = " SIZE_FORMAT, _estimated_metaspaceobj_bytes);
 355   log_info(cds)("total estimate bytes = " SIZE_FORMAT, total);
 356 
 357   return align_up(total, MetaspaceShared::core_region_alignment());
 358 }
 359 
 360 address ArchiveBuilder::reserve_buffer() {
 361   size_t buffer_size = estimate_archive_size();
 362   ReservedSpace rs(buffer_size, MetaspaceShared::core_region_alignment(), os::vm_page_size());
 363   if (!rs.is_reserved()) {
 364     log_error(cds)("Failed to reserve " SIZE_FORMAT " bytes of output buffer.", buffer_size);
 365     MetaspaceShared::unrecoverable_writing_error();
 366   }
 367 
 368   // buffer_bottom is the lowest address of the 2 core regions (rw, ro) when
 369   // we are copying the class metadata into the buffer.
 370   address buffer_bottom = (address)rs.base();
 371   log_info(cds)("Reserved output buffer space at " PTR_FORMAT " [" SIZE_FORMAT " bytes]",
 372                 p2i(buffer_bottom), buffer_size);
 373   _shared_rs = rs;
 374 
 375   _buffer_bottom = buffer_bottom;
 376   _last_verified_top = buffer_bottom;
 377   _current_dump_space = &_rw_region;
 378   _num_dump_regions_used = 1;
 379   _other_region_used_bytes = 0;
 380   _current_dump_space->init(&_shared_rs, &_shared_vs);
 381 
 382   ArchivePtrMarker::initialize(&_ptrmap, &_shared_vs);
 383 
 384   // The bottom of the static archive should be mapped at this address by default.
 385   _requested_static_archive_bottom = (address)MetaspaceShared::requested_base_address();
 386 
 387   // The bottom of the archive (that I am writing now) should be mapped at this address by default.
 388   address my_archive_requested_bottom;
 389 
 390   if (CDSConfig::is_dumping_static_archive()) {
 391     my_archive_requested_bottom = _requested_static_archive_bottom;
 392   } else {
 393     _mapped_static_archive_bottom = (address)MetaspaceObj::shared_metaspace_base();
 394     _mapped_static_archive_top  = (address)MetaspaceObj::shared_metaspace_top();
 395     assert(_mapped_static_archive_top >= _mapped_static_archive_bottom, "must be");
 396     size_t static_archive_size = _mapped_static_archive_top - _mapped_static_archive_bottom;
 397 
 398     // At run time, we will mmap the dynamic archive at my_archive_requested_bottom
 399     _requested_static_archive_top = _requested_static_archive_bottom + static_archive_size;
 400     my_archive_requested_bottom = align_up(_requested_static_archive_top, MetaspaceShared::core_region_alignment());
 401 
 402     _requested_dynamic_archive_bottom = my_archive_requested_bottom;
 403   }
 404 
 405   _buffer_to_requested_delta = my_archive_requested_bottom - _buffer_bottom;
 406 
 407   address my_archive_requested_top = my_archive_requested_bottom + buffer_size;
 408   if (my_archive_requested_bottom <  _requested_static_archive_bottom ||
 409       my_archive_requested_top    <= _requested_static_archive_bottom) {
 410     // Size overflow.
 411     log_error(cds)("my_archive_requested_bottom = " INTPTR_FORMAT, p2i(my_archive_requested_bottom));
 412     log_error(cds)("my_archive_requested_top    = " INTPTR_FORMAT, p2i(my_archive_requested_top));
 413     log_error(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is too high. "
 414                    "Please rerun java -Xshare:dump with a lower value", p2i(_requested_static_archive_bottom));
 415     MetaspaceShared::unrecoverable_writing_error();
 416   }
 417 
 418   if (CDSConfig::is_dumping_static_archive()) {
 419     // We don't want any valid object to be at the very bottom of the archive.
 420     // See ArchivePtrMarker::mark_pointer().
 421     rw_region()->allocate(16);
 422   }
 423 
 424   return buffer_bottom;
 425 }
 426 
 427 void ArchiveBuilder::iterate_sorted_roots(MetaspaceClosure* it) {
 428   int num_symbols = _symbols->length();
 429   for (int i = 0; i < num_symbols; i++) {
 430     it->push(_symbols->adr_at(i));
 431   }
 432 
 433   int num_klasses = _klasses->length();
 434   for (int i = 0; i < num_klasses; i++) {
 435     it->push(_klasses->adr_at(i));
 436   }
 437 
 438   iterate_roots(it);
 439 }
 440 
 441 class GatherSortedSourceObjs : public MetaspaceClosure {
 442   ArchiveBuilder* _builder;
 443 
 444 public:
 445   GatherSortedSourceObjs(ArchiveBuilder* builder) : _builder(builder) {}
 446 
 447   virtual bool do_ref(Ref* ref, bool read_only) {
 448     return _builder->gather_one_source_obj(ref, read_only);
 449   }
 450 };
 451 
 452 bool ArchiveBuilder::gather_one_source_obj(MetaspaceClosure::Ref* ref, bool read_only) {
 453   address src_obj = ref->obj();
 454   if (src_obj == nullptr) {
 455     return false;
 456   }
 457   if (RegeneratedClasses::has_been_regenerated(src_obj)) {
 458     // No need to copy it. We will later relocate it to point to the regenerated klass/method.
 459     return false;
 460   }
 461   remember_embedded_pointer_in_enclosing_obj(ref);
 462   if (RegeneratedClasses::has_been_regenerated(src_obj)) {
 463     // No need to copy it. We will later relocate it to point to the regenerated klass/method.
 464     return false;
 465   }
 466 
 467   FollowMode follow_mode = get_follow_mode(ref);
 468   SourceObjInfo src_info(ref, read_only, follow_mode);
 469   bool created;
 470   SourceObjInfo* p = _src_obj_table.put_if_absent(src_obj, src_info, &created);
 471   if (created) {
 472     if (_src_obj_table.maybe_grow()) {
 473       log_info(cds, hashtables)("Expanded _src_obj_table table to %d", _src_obj_table.table_size());
 474     }
 475   }
 476 
 477 #ifdef ASSERT
 478   if (ref->msotype() == MetaspaceObj::MethodType) {
 479     Method* m = (Method*)ref->obj();
 480     assert(!RegeneratedClasses::has_been_regenerated((address)m->method_holder()),
 481            "Should not archive methods in a class that has been regenerated");
 482   }
 483 #endif
 484 
 485   assert(p->read_only() == src_info.read_only(), "must be");
 486 
 487   if (created && src_info.should_copy()) {
 488     if (read_only) {
 489       _ro_src_objs.append(p);
 490     } else {
 491       _rw_src_objs.append(p);
 492     }
 493     return true; // Need to recurse into this ref only if we are copying it
 494   } else {
 495     return false;
 496   }
 497 }
 498 
 499 void ArchiveBuilder::record_regenerated_object(address orig_src_obj, address regen_src_obj) {
 500   // Record the fact that orig_src_obj has been replaced by regen_src_obj. All calls to get_buffered_addr(orig_src_obj)
 501   // should return the same value as get_buffered_addr(regen_src_obj).
 502   SourceObjInfo* p = _src_obj_table.get(regen_src_obj);
 503   assert(p != nullptr, "regenerated object should always be dumped");
 504   SourceObjInfo orig_src_info(orig_src_obj, p);
 505   bool created;
 506   _src_obj_table.put_if_absent(orig_src_obj, orig_src_info, &created);
 507   assert(created, "We shouldn't have archived the original copy of a regenerated object");
 508 }
 509 
 510 // Remember that we have a pointer inside ref->enclosing_obj() that points to ref->obj()
 511 void ArchiveBuilder::remember_embedded_pointer_in_enclosing_obj(MetaspaceClosure::Ref* ref) {
 512   assert(ref->obj() != nullptr, "should have checked");
 513 
 514   address enclosing_obj = ref->enclosing_obj();
 515   if (enclosing_obj == nullptr) {
 516     return;
 517   }
 518 
 519   // We are dealing with 3 addresses:
 520   // address o    = ref->obj(): We have found an object whose address is o.
 521   // address* mpp = ref->mpp(): The object o is pointed to by a pointer whose address is mpp.
 522   //                            I.e., (*mpp == o)
 523   // enclosing_obj            : If non-null, it is the object which has a field that points to o.
 524   //                            mpp is the address if that field.
 525   //
 526   // Example: We have an array whose first element points to a Method:
 527   //     Method* o                     = 0x0000abcd;
 528   //     Array<Method*>* enclosing_obj = 0x00001000;
 529   //     enclosing_obj->at_put(0, o);
 530   //
 531   // We the MetaspaceClosure iterates on the very first element of this array, we have
 532   //     ref->obj()           == 0x0000abcd   (the Method)
 533   //     ref->mpp()           == 0x00001008   (the location of the first element in the array)
 534   //     ref->enclosing_obj() == 0x00001000   (the Array that contains the Method)
 535   //
 536   // We use the above information to mark the bitmap to indicate that there's a pointer on address 0x00001008.
 537   SourceObjInfo* src_info = _src_obj_table.get(enclosing_obj);
 538   if (src_info == nullptr || !src_info->should_copy()) {
 539     // source objects of point_to_it/set_to_null types are not copied
 540     // so we don't need to remember their pointers.
 541   } else {
 542     if (src_info->read_only()) {
 543       _ro_src_objs.remember_embedded_pointer(src_info, ref);
 544     } else {
 545       _rw_src_objs.remember_embedded_pointer(src_info, ref);
 546     }
 547   }
 548 }
 549 
 550 void ArchiveBuilder::gather_source_objs() {
 551   ResourceMark rm;
 552   log_info(cds)("Gathering all archivable objects ... ");
 553   gather_klasses_and_symbols();
 554   GatherSortedSourceObjs doit(this);
 555   iterate_sorted_roots(&doit);
 556   doit.finish();
 557 }
 558 
 559 bool ArchiveBuilder::is_excluded(Klass* klass) {
 560   if (klass->is_instance_klass()) {
 561     InstanceKlass* ik = InstanceKlass::cast(klass);
 562     return SystemDictionaryShared::is_excluded_class(ik);
 563   } else if (klass->is_objArray_klass()) {
 564     Klass* bottom = ObjArrayKlass::cast(klass)->bottom_klass();
 565     if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_shared_static(bottom)) {
 566       // The bottom class is in the static archive so it's clearly not excluded.
 567       assert(CDSConfig::is_dumping_dynamic_archive(), "sanity");
 568       return false;
 569     } else if (bottom->is_instance_klass()) {
 570       return SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(bottom));
 571     }
 572   }
 573 
 574   return false;
 575 }
 576 
 577 ArchiveBuilder::FollowMode ArchiveBuilder::get_follow_mode(MetaspaceClosure::Ref *ref) {
 578   address obj = ref->obj();
 579   if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_in_shared_metaspace(obj)) {
 580     // Don't dump existing shared metadata again.
 581     return point_to_it;
 582   } else if (ref->msotype() == MetaspaceObj::MethodDataType ||
 583              ref->msotype() == MetaspaceObj::MethodCountersType ||
 584              ref->msotype() == MetaspaceObj::KlassTrainingDataType ||
 585              ref->msotype() == MetaspaceObj::MethodTrainingDataType ||
 586              ref->msotype() == MetaspaceObj::CompileTrainingDataType) {
 587       return TrainingData::need_data() ? make_a_copy : set_to_null;
 588   } else {
 589     if (ref->msotype() == MetaspaceObj::ClassType) {
 590       Klass* klass = (Klass*)ref->obj();
 591       assert(klass->is_klass(), "must be");
 592       if (is_excluded(klass)) {
 593         ResourceMark rm;
 594         log_debug(cds, dynamic)("Skipping class (excluded): %s", klass->external_name());
 595         return set_to_null;
 596       }
 597     }
 598 
 599     return make_a_copy;
 600   }
 601 }
 602 
 603 void ArchiveBuilder::start_dump_space(DumpRegion* next) {
 604   address bottom = _last_verified_top;
 605   address top = (address)(current_dump_space()->top());
 606   _other_region_used_bytes += size_t(top - bottom);
 607 
 608   current_dump_space()->pack(next);
 609   _current_dump_space = next;
 610   _num_dump_regions_used ++;
 611 
 612   _last_verified_top = (address)(current_dump_space()->top());
 613 }
 614 
 615 void ArchiveBuilder::verify_estimate_size(size_t estimate, const char* which) {
 616   address bottom = _last_verified_top;
 617   address top = (address)(current_dump_space()->top());
 618   size_t used = size_t(top - bottom) + _other_region_used_bytes;
 619   int diff = int(estimate) - int(used);
 620 
 621   log_info(cds)("%s estimate = " SIZE_FORMAT " used = " SIZE_FORMAT "; diff = %d bytes", which, estimate, used, diff);
 622   assert(diff >= 0, "Estimate is too small");
 623 
 624   _last_verified_top = top;
 625   _other_region_used_bytes = 0;
 626 }
 627 
 628 char* ArchiveBuilder::ro_strdup(const char* s) {
 629   char* archived_str = ro_region_alloc((int)strlen(s) + 1);
 630   strcpy(archived_str, s);
 631   return archived_str;
 632 }
 633 
 634 void ArchiveBuilder::dump_rw_metadata() {
 635   ResourceMark rm;
 636   log_info(cds)("Allocating RW objects ... ");
 637   make_shallow_copies(&_rw_region, &_rw_src_objs);
 638 
 639 #if INCLUDE_CDS_JAVA_HEAP
 640   if (CDSConfig::is_dumping_full_module_graph()) {
 641     // Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
 642     char* start = rw_region()->top();
 643     ClassLoaderDataShared::allocate_archived_tables();
 644     alloc_stats()->record_modules(rw_region()->top() - start, /*read_only*/false);
 645   }
 646 #endif
 647 }
 648 
 649 void ArchiveBuilder::dump_ro_metadata() {
 650   ResourceMark rm;
 651   log_info(cds)("Allocating RO objects ... ");
 652 
 653   start_dump_space(&_ro_region);
 654   make_shallow_copies(&_ro_region, &_ro_src_objs);
 655 
 656 #if INCLUDE_CDS_JAVA_HEAP
 657   if (CDSConfig::is_dumping_full_module_graph()) {
 658     char* start = ro_region()->top();
 659     ClassLoaderDataShared::init_archived_tables();
 660     alloc_stats()->record_modules(ro_region()->top() - start, /*read_only*/true);
 661   }
 662 #endif
 663 
 664   RegeneratedClasses::record_regenerated_objects();
 665 }
 666 
 667 void ArchiveBuilder::make_shallow_copies(DumpRegion *dump_region,
 668                                          const ArchiveBuilder::SourceObjList* src_objs) {
 669   for (int i = 0; i < src_objs->objs()->length(); i++) {
 670     make_shallow_copy(dump_region, src_objs->objs()->at(i));
 671   }
 672   log_info(cds)("done (%d objects)", src_objs->objs()->length());
 673 }
 674 
 675 void ArchiveBuilder::make_shallow_copy(DumpRegion *dump_region, SourceObjInfo* src_info) {
 676   address src = src_info->source_addr();
 677   int bytes = src_info->size_in_bytes();
 678   char* dest;
 679   char* oldtop;
 680   char* newtop;
 681 
 682   oldtop = dump_region->top();
 683   if (src_info->msotype() == MetaspaceObj::ClassType) {
 684     // Save a pointer immediate in front of an InstanceKlass, so
 685     // we can do a quick lookup from InstanceKlass* -> RunTimeClassInfo*
 686     // without building another hashtable. See RunTimeClassInfo::get_for()
 687     // in systemDictionaryShared.cpp.
 688     Klass* klass = (Klass*)src;
 689     if (klass->is_instance_klass()) {
 690       SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
 691       dump_region->allocate(sizeof(address));
 692     }
 693   }
 694   dest = dump_region->allocate(bytes);
 695   newtop = dump_region->top();
 696 
 697   memcpy(dest, src, bytes);
 698 
 699   // Update the hash of buffered sorted symbols for static dump so that the symbols have deterministic contents
 700   if (CDSConfig::is_dumping_static_archive() && (src_info->msotype() == MetaspaceObj::SymbolType)) {
 701     Symbol* buffered_symbol = (Symbol*)dest;
 702     assert(((Symbol*)src)->is_permanent(), "archived symbols must be permanent");
 703     buffered_symbol->update_identity_hash();
 704   }
 705 
 706   {
 707     bool created;
 708     _buffered_to_src_table.put_if_absent((address)dest, src, &created);
 709     assert(created, "must be");
 710     if (_buffered_to_src_table.maybe_grow()) {
 711       log_info(cds, hashtables)("Expanded _buffered_to_src_table table to %d", _buffered_to_src_table.table_size());
 712     }
 713   }
 714 
 715   intptr_t* archived_vtable = CppVtables::get_archived_vtable(src_info->msotype(), (address)dest);
 716   if (archived_vtable != nullptr) {
 717     *(address*)dest = (address)archived_vtable;
 718     ArchivePtrMarker::mark_pointer((address*)dest);
 719   }
 720 
 721   log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(src), p2i(dest), bytes);
 722   src_info->set_buffered_addr((address)dest);
 723 
 724   _alloc_stats.record(src_info->msotype(), int(newtop - oldtop), src_info->read_only());
 725 }
 726 
 727 // This is used by code that hand-assembles data structures, such as the LambdaProxyClassKey, that are
 728 // not handled by MetaspaceClosure.
 729 void ArchiveBuilder::write_pointer_in_buffer(address* ptr_location, address src_addr) {
 730   assert(is_in_buffer_space(ptr_location), "must be");
 731   if (src_addr == nullptr) {
 732     *ptr_location = nullptr;
 733     ArchivePtrMarker::clear_pointer(ptr_location);
 734   } else {
 735     *ptr_location = get_buffered_addr(src_addr);
 736     ArchivePtrMarker::mark_pointer(ptr_location);
 737   }
 738 }
 739 
 740 void ArchiveBuilder::mark_and_relocate_to_buffered_addr(address* ptr_location) {
 741   assert(*ptr_location != nullptr, "sanity");
 742   if (!is_in_mapped_static_archive(*ptr_location)) {
 743     *ptr_location = get_buffered_addr(*ptr_location);
 744   }
 745   ArchivePtrMarker::mark_pointer(ptr_location);
 746 }
 747 
 748 address ArchiveBuilder::get_buffered_addr(address src_addr) const {
 749   SourceObjInfo* p = _src_obj_table.get(src_addr);
 750   assert(p != nullptr, "src_addr " INTPTR_FORMAT " is used but has not been archived",
 751          p2i(src_addr));
 752 
 753   return p->buffered_addr();
 754 }
 755 
 756 bool ArchiveBuilder::has_been_archived(address src_addr) const {
 757   SourceObjInfo* p = _src_obj_table.get(src_addr);
 758   return (p != nullptr);
 759 }
 760 
 761 address ArchiveBuilder::get_source_addr(address buffered_addr) const {
 762   assert(is_in_buffer_space(buffered_addr), "must be");
 763   address* src_p = _buffered_to_src_table.get(buffered_addr);
 764   assert(src_p != nullptr && *src_p != nullptr, "must be");
 765   return *src_p;
 766 }
 767 
 768 void ArchiveBuilder::relocate_embedded_pointers(ArchiveBuilder::SourceObjList* src_objs) {
 769   for (int i = 0; i < src_objs->objs()->length(); i++) {
 770     src_objs->relocate(i, this);
 771   }
 772 }
 773 
 774 void ArchiveBuilder::relocate_metaspaceobj_embedded_pointers() {
 775   log_info(cds)("Relocating embedded pointers in core regions ... ");
 776   relocate_embedded_pointers(&_rw_src_objs);
 777   relocate_embedded_pointers(&_ro_src_objs);
 778 }
 779 
 780 #define ADD_COUNT(x) \
 781   x += 1; \
 782   x ## _i += inited;
 783 
 784 #define DECLARE_INSTANCE_KLASS_COUNTER(x) \
 785   int x = 0; \
 786   int x ## _i = 0; \
 787 
 788 void ArchiveBuilder::make_klasses_shareable() {
 789   DECLARE_INSTANCE_KLASS_COUNTER(num_instance_klasses);
 790   DECLARE_INSTANCE_KLASS_COUNTER(num_boot_klasses);
 791   DECLARE_INSTANCE_KLASS_COUNTER(num_vm_klasses);
 792   DECLARE_INSTANCE_KLASS_COUNTER(num_platform_klasses);
 793   DECLARE_INSTANCE_KLASS_COUNTER(num_app_klasses);
 794   DECLARE_INSTANCE_KLASS_COUNTER(num_hidden_klasses);
 795   DECLARE_INSTANCE_KLASS_COUNTER(num_unlinked_klasses);
 796   DECLARE_INSTANCE_KLASS_COUNTER(num_unregistered_klasses);
 797   int num_obj_array_klasses = 0;
 798   int num_type_array_klasses = 0;
 799 
 800   int boot_unlinked = 0;
 801   int platform_unlinked = 0;
 802   int app_unlinked = 0;
 803   int unreg_unlinked = 0;
 804 
 805   for (int i = 0; i < klasses()->length(); i++) {
 806     // Some of the code in ConstantPool::remove_unshareable_info() requires the classes
 807     // to be in linked state, so it must be call here before the next loop, which returns
 808     // all classes to unlinked state.
 809     Klass* k = get_buffered_addr(klasses()->at(i));
 810     if (k->is_instance_klass()) {
 811       InstanceKlass::cast(k)->constants()->remove_unshareable_info();
 812     }
 813   }
 814 
 815   for (int i = 0; i < klasses()->length(); i++) {
 816     const char* type;
 817     const char* unlinked = "";
 818     const char* hidden = "";
 819     const char* generated = "";
 820     Klass* k = get_buffered_addr(klasses()->at(i));
 821     k->remove_java_mirror();
 822     if (k->is_objArray_klass()) {
 823       // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
 824       // on their array classes.
 825       num_obj_array_klasses ++;
 826       type = "array";
 827     } else if (k->is_typeArray_klass()) {
 828       num_type_array_klasses ++;
 829       type = "array";
 830       k->remove_unshareable_info();
 831     } else {
 832       assert(k->is_instance_klass(), " must be");
 833       InstanceKlass* ik = InstanceKlass::cast(k);
 834       InstanceKlass* src_ik = get_source_addr(ik);
 835       int inited = ik->has_preinitialized_mirror();
 836       ADD_COUNT(num_instance_klasses);
 837       if (CDSConfig::is_dumping_dynamic_archive()) {
 838         // For static dump, class loader type are already set.
 839         ik->assign_class_loader_type();
 840       }
 841       if (ik->is_hidden()) {
 842         oop loader = k->class_loader();
 843         if (loader == nullptr) {
 844           type = "boot";
 845           ADD_COUNT(num_boot_klasses);
 846         } else if (loader == SystemDictionary::java_platform_loader()) {
 847           type = "plat";
 848           ADD_COUNT(num_platform_klasses);
 849         } else if (loader == SystemDictionary::java_system_loader()) {
 850           type = "app";
 851           ADD_COUNT(num_app_klasses);
 852         } else {
 853           type = "bad";
 854           assert(0, "shouldn't happen");
 855         }
 856       } else if (ik->is_shared_boot_class()) {
 857         type = "boot";
 858         ADD_COUNT(num_boot_klasses);
 859       } else if (ik->is_shared_platform_class()) {
 860         type = "plat";
 861         ADD_COUNT(num_platform_klasses);
 862       } else if (ik->is_shared_app_class()) {
 863         type = "app";
 864         ADD_COUNT(num_app_klasses);
 865       } else {
 866         assert(ik->is_shared_unregistered_class(), "must be");
 867         type = "unreg";
 868         ADD_COUNT(num_unregistered_klasses);
 869       }
 870 
 871       if (ClassPrelinker::is_vm_class(src_ik)) {
 872         ADD_COUNT(num_vm_klasses);
 873       }
 874 
 875       if (!ik->is_linked()) {
 876         ADD_COUNT(num_unlinked_klasses);
 877         unlinked = " ** unlinked";
 878         if (ik->is_shared_boot_class()) {
 879           boot_unlinked ++;
 880         } else if (ik->is_shared_platform_class()) {
 881           platform_unlinked ++;
 882         } else if (ik->is_shared_app_class()) {
 883           app_unlinked ++;
 884         } else {
 885           unreg_unlinked ++;
 886         }
 887       }
 888 
 889       if (ik->is_hidden()) {
 890         ADD_COUNT(num_hidden_klasses);
 891         hidden = " ** hidden";
 892       }
 893 
 894       if (ik->is_generated_shared_class()) {
 895         generated = " ** generated";
 896       }
 897       MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread::current(), ik);
 898       ik->remove_unshareable_info();
 899     }
 900 
 901     if (log_is_enabled(Debug, cds, class)) {
 902       ResourceMark rm;
 903       log_debug(cds, class)("klasses[%5d] = " PTR_FORMAT " %-5s %s%s%s%s", i,
 904                             p2i(to_requested(k)), type, k->external_name(),
 905                             hidden, unlinked, generated);
 906     }
 907   }
 908 
 909   log_info(cds)("Number of classes %d", num_instance_klasses + num_obj_array_klasses + num_type_array_klasses);
 910   log_info(cds)("    instance classes   = %5d, inited = %5d", num_instance_klasses,     num_instance_klasses_i);
 911   log_info(cds)("      boot             = %5d, inited = %5d", num_boot_klasses,         num_boot_klasses_i);
 912   log_info(cds)("       vm              = %5d, inited = %5d", num_vm_klasses,           num_vm_klasses_i);
 913   log_info(cds)("      platform         = %5d, inited = %5d", num_platform_klasses,     num_platform_klasses_i);
 914   log_info(cds)("      app              = %5d, inited = %5d", num_app_klasses,          num_app_klasses_i);
 915   log_info(cds)("      unregistered     = %5d, inited = %5d", num_unregistered_klasses, num_unregistered_klasses_i);
 916   log_info(cds)("      (hidden)         = %5d, inited = %5d", num_hidden_klasses,       num_hidden_klasses_i);
 917   log_info(cds)("      (unlinked)       = %5d, inited = %5d, boot = %d, plat = %d, app = %d, unreg = %d",
 918                                                               num_unlinked_klasses,     num_unlinked_klasses_i,
 919                                                               boot_unlinked, platform_unlinked,
 920                                                               app_unlinked, unreg_unlinked);
 921   log_info(cds)("    obj array classes  = %5d", num_obj_array_klasses);
 922   log_info(cds)("    type array classes = %5d", num_type_array_klasses);
 923   log_info(cds)("               symbols = %5d", _symbols->length());
 924 
 925   DynamicArchive::make_array_klasses_shareable();
 926 }
 927 
 928 void ArchiveBuilder::serialize_dynamic_archivable_items(SerializeClosure* soc) {
 929   SymbolTable::serialize_shared_table_header(soc, false);
 930   SystemDictionaryShared::serialize_dictionary_headers(soc, false);
 931   DynamicArchive::serialize_array_klasses(soc);
 932   ClassPrelinker::serialize(soc, false);
 933   TrainingData::serialize_training_data(soc);
 934 }
 935 
 936 uintx ArchiveBuilder::buffer_to_offset(address p) const {
 937   address requested_p = to_requested(p);
 938   assert(requested_p >= _requested_static_archive_bottom, "must be");
 939   return requested_p - _requested_static_archive_bottom;
 940 }
 941 
 942 uintx ArchiveBuilder::any_to_offset(address p) const {
 943   if (is_in_mapped_static_archive(p)) {
 944     assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
 945     return p - _mapped_static_archive_bottom;
 946   }
 947   if (!is_in_buffer_space(p)) {
 948     // p must be a "source" address
 949     p = get_buffered_addr(p);
 950   }
 951   return buffer_to_offset(p);
 952 }
 953 
 954 void ArchiveBuilder::start_cc_region() {
 955   ro_region()->pack();
 956   start_dump_space(&_cc_region);
 957 }
 958 
 959 void ArchiveBuilder::end_cc_region() {
 960   _cc_region.pack();
 961 }
 962 
 963 #if INCLUDE_CDS_JAVA_HEAP
 964 narrowKlass ArchiveBuilder::get_requested_narrow_klass(Klass* k) {
 965   assert(CDSConfig::is_dumping_heap(), "sanity");
 966   k = get_buffered_klass(k);
 967   Klass* requested_k = to_requested(k);
 968   address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
 969   const int narrow_klass_shift = ArchiveHeapWriter::precomputed_narrow_klass_shift;
 970   return CompressedKlassPointers::encode_not_null(requested_k, narrow_klass_base, narrow_klass_shift);
 971 }
 972 #endif // INCLUDE_CDS_JAVA_HEAP
 973 
 974 // RelocateBufferToRequested --- Relocate all the pointers in rw/ro,
 975 // so that the archive can be mapped to the "requested" location without runtime relocation.
 976 //
 977 // - See ArchiveBuilder header for the definition of "buffer", "mapped" and "requested"
 978 // - ArchivePtrMarker::ptrmap() marks all the pointers in the rw/ro regions
 979 // - Every pointer must have one of the following values:
 980 //   [a] nullptr:
 981 //       No relocation is needed. Remove this pointer from ptrmap so we don't need to
 982 //       consider it at runtime.
 983 //   [b] Points into an object X which is inside the buffer:
 984 //       Adjust this pointer by _buffer_to_requested_delta, so it points to X
 985 //       when the archive is mapped at the requested location.
 986 //   [c] Points into an object Y which is inside mapped static archive:
 987 //       - This happens only during dynamic dump
 988 //       - Adjust this pointer by _mapped_to_requested_static_archive_delta,
 989 //         so it points to Y when the static archive is mapped at the requested location.
 990 template <bool STATIC_DUMP>
 991 class RelocateBufferToRequested : public BitMapClosure {
 992   ArchiveBuilder* _builder;
 993   address _buffer_bottom;
 994   intx _buffer_to_requested_delta;
 995   intx _mapped_to_requested_static_archive_delta;
 996   size_t _max_non_null_offset;
 997 
 998  public:
 999   RelocateBufferToRequested(ArchiveBuilder* builder) {
1000     _builder = builder;
1001     _buffer_bottom = _builder->buffer_bottom();
1002     _buffer_to_requested_delta = builder->buffer_to_requested_delta();
1003     _mapped_to_requested_static_archive_delta = builder->requested_static_archive_bottom() - builder->mapped_static_archive_bottom();
1004     _max_non_null_offset = 0;
1005 
1006     address bottom = _builder->buffer_bottom();
1007     address top = _builder->buffer_top();
1008     address new_bottom = bottom + _buffer_to_requested_delta;
1009     address new_top = top + _buffer_to_requested_delta;
1010     log_debug(cds)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT "] to "
1011                    "[" INTPTR_FORMAT " - " INTPTR_FORMAT "]",
1012                    p2i(bottom), p2i(top),
1013                    p2i(new_bottom), p2i(new_top));
1014   }
1015 
1016   bool do_bit(size_t offset) {
1017     address* p = (address*)_buffer_bottom + offset;
1018     assert(_builder->is_in_buffer_space(p), "pointer must live in buffer space");
1019 
1020     if (*p == nullptr) {
1021       // todo -- clear bit, etc
1022       ArchivePtrMarker::ptrmap()->clear_bit(offset);
1023     } else {
1024       if (STATIC_DUMP) {
1025         assert(_builder->is_in_buffer_space(*p), "old pointer must point inside buffer space");
1026         *p += _buffer_to_requested_delta;
1027         assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1028       } else {
1029         if (_builder->is_in_buffer_space(*p)) {
1030           *p += _buffer_to_requested_delta;
1031           // assert is in requested dynamic archive
1032         } else {
1033           assert(_builder->is_in_mapped_static_archive(*p), "old pointer must point inside buffer space or mapped static archive");
1034           *p += _mapped_to_requested_static_archive_delta;
1035           assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
1036         }
1037       }
1038       _max_non_null_offset = offset;
1039     }
1040 
1041     return true; // keep iterating
1042   }
1043 
1044   void doit() {
1045     ArchivePtrMarker::ptrmap()->iterate(this);
1046     ArchivePtrMarker::compact(_max_non_null_offset);
1047   }
1048 };
1049 
1050 
1051 void ArchiveBuilder::relocate_to_requested() {
1052   if (!ro_region()->is_packed()) {
1053     ro_region()->pack();
1054   }
1055 
1056   size_t my_archive_size = buffer_top() - buffer_bottom();
1057 
1058   if (CDSConfig::is_dumping_static_archive()) {
1059     _requested_static_archive_top = _requested_static_archive_bottom + my_archive_size;
1060     RelocateBufferToRequested<true> patcher(this);
1061     patcher.doit();
1062   } else {
1063     assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
1064     _requested_dynamic_archive_top = _requested_dynamic_archive_bottom + my_archive_size;
1065     RelocateBufferToRequested<false> patcher(this);
1066     patcher.doit();
1067   }
1068 }
1069 
1070 // Write detailed info to a mapfile to analyze contents of the archive.
1071 // static dump:
1072 //   java -Xshare:dump -Xlog:cds+map=trace:file=cds.map:none:filesize=0
1073 // dynamic dump:
1074 //   java -cp MyApp.jar -XX:ArchiveClassesAtExit=MyApp.jsa \
1075 //        -Xlog:cds+map=trace:file=cds.map:none:filesize=0 MyApp
1076 //
1077 // We need to do some address translation because the buffers used at dump time may be mapped to
1078 // a different location at runtime. At dump time, the buffers may be at arbitrary locations
1079 // picked by the OS. At runtime, we try to map at a fixed location (SharedBaseAddress). For
1080 // consistency, we log everything using runtime addresses.
1081 class ArchiveBuilder::CDSMapLogger : AllStatic {
1082   static intx buffer_to_runtime_delta() {
1083     // Translate the buffers used by the RW/RO regions to their eventual (requested) locations
1084     // at runtime.
1085     return ArchiveBuilder::current()->buffer_to_requested_delta();
1086   }
1087 
1088   // rw/ro regions only
1089   static void log_metaspace_region(const char* name, DumpRegion* region,
1090                                    const ArchiveBuilder::SourceObjList* src_objs) {
1091     address region_base = address(region->base());
1092     address region_top  = address(region->top());
1093     log_region(name, region_base, region_top, region_base + buffer_to_runtime_delta());
1094     log_metaspace_objects(region, src_objs);
1095   }
1096 
1097 #define _LOG_PREFIX PTR_FORMAT ": @@ %-17s %d"
1098 
1099   static void log_klass(Klass* k, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1100     ResourceMark rm(current);
1101     log_debug(cds, map)(_LOG_PREFIX " %s",
1102                         p2i(runtime_dest), type_name, bytes, k->external_name());
1103   }
1104   static void log_method(Method* m, address runtime_dest, const char* type_name, int bytes, Thread* current) {
1105     ResourceMark rm(current);
1106     log_debug(cds, map)(_LOG_PREFIX " %s",
1107                         p2i(runtime_dest), type_name, bytes,  m->external_name());
1108   }
1109 
1110   // rw/ro regions only
1111   static void log_metaspace_objects(DumpRegion* region, const ArchiveBuilder::SourceObjList* src_objs) {
1112     address last_obj_base = address(region->base());
1113     address last_obj_end  = address(region->base());
1114     address region_end    = address(region->end());
1115     Thread* current = Thread::current();
1116     for (int i = 0; i < src_objs->objs()->length(); i++) {
1117       SourceObjInfo* src_info = src_objs->at(i);
1118       address src = src_info->source_addr();
1119       address dest = src_info->buffered_addr();
1120       log_as_hex(last_obj_base, dest, last_obj_base + buffer_to_runtime_delta());
1121       address runtime_dest = dest + buffer_to_runtime_delta();
1122       int bytes = src_info->size_in_bytes();
1123 
1124       MetaspaceObj::Type type = src_info->msotype();
1125       const char* type_name = MetaspaceObj::type_name(type);
1126 
1127       switch (type) {
1128       case MetaspaceObj::ClassType:
1129         log_klass((Klass*)src, runtime_dest, type_name, bytes, current);
1130         break;
1131       case MetaspaceObj::ConstantPoolType:
1132         log_klass(((ConstantPool*)src)->pool_holder(),
1133                     runtime_dest, type_name, bytes, current);
1134         break;
1135       case MetaspaceObj::ConstantPoolCacheType:
1136         log_klass(((ConstantPoolCache*)src)->constant_pool()->pool_holder(),
1137                     runtime_dest, type_name, bytes, current);
1138         break;
1139       case MetaspaceObj::MethodType:
1140         log_method((Method*)src, runtime_dest, type_name, bytes, current);
1141         break;
1142       case MetaspaceObj::ConstMethodType:
1143         log_method(((ConstMethod*)src)->method(), runtime_dest, type_name, bytes, current);
1144         break;
1145       case MetaspaceObj::SymbolType:
1146         {
1147           ResourceMark rm(current);
1148           Symbol* s = (Symbol*)src;
1149           log_debug(cds, map)(_LOG_PREFIX " %s", p2i(runtime_dest), type_name, bytes,
1150                               s->as_quoted_ascii());
1151         }
1152         break;
1153       default:
1154         log_debug(cds, map)(_LOG_PREFIX, p2i(runtime_dest), type_name, bytes);
1155         break;
1156       }
1157 
1158       last_obj_base = dest;
1159       last_obj_end  = dest + bytes;
1160     }
1161 
1162     log_as_hex(last_obj_base, last_obj_end, last_obj_base + buffer_to_runtime_delta());
1163     if (last_obj_end < region_end) {
1164       log_debug(cds, map)(PTR_FORMAT ": @@ Misc data " SIZE_FORMAT " bytes",
1165                           p2i(last_obj_end + buffer_to_runtime_delta()),
1166                           size_t(region_end - last_obj_end));
1167       log_as_hex(last_obj_end, region_end, last_obj_end + buffer_to_runtime_delta());
1168     }
1169   }
1170 
1171 #undef _LOG_PREFIX
1172 
1173   // Log information about a region, whose address at dump time is [base .. top). At
1174   // runtime, this region will be mapped to requested_base. requested_base is 0 if this
1175   // region will be mapped at os-selected addresses (such as the bitmap region), or will
1176   // be accessed with os::read (the header).
1177   //
1178   // Note: across -Xshare:dump runs, base may be different, but requested_base should
1179   // be the same as the archive contents should be deterministic.
1180   static void log_region(const char* name, address base, address top, address requested_base) {
1181     size_t size = top - base;
1182     base = requested_base;
1183     top = requested_base + size;
1184     log_info(cds, map)("[%-18s " PTR_FORMAT " - " PTR_FORMAT " " SIZE_FORMAT_W(9) " bytes]",
1185                        name, p2i(base), p2i(top), size);
1186   }
1187 
1188 #if INCLUDE_CDS_JAVA_HEAP
1189   static void log_heap_region(ArchiveHeapInfo* heap_info) {
1190     MemRegion r = heap_info->buffer_region();
1191     address start = address(r.start());
1192     address end = address(r.end());
1193     log_region("heap", start, end, ArchiveHeapWriter::buffered_addr_to_requested_addr(start));
1194 
1195     LogStreamHandle(Info, cds, map) st;
1196 
1197     while (start < end) {
1198       size_t byte_size;
1199       oop source_oop = ArchiveHeapWriter::buffered_addr_to_source_obj(start);
1200       address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
1201       st.print(PTR_FORMAT ": @@ Object ", p2i(requested_start));
1202       int permobj_segment = -1;
1203       int permobj_segment_length = -1;
1204 
1205       if (source_oop != nullptr) {
1206         // This is a regular oop that got archived.
1207         print_oop_with_requested_addr_cr(&st, source_oop, false);
1208         byte_size = source_oop->size() * BytesPerWord;
1209       } else if (start == ArchiveHeapWriter::buffered_heap_roots_addr()) {
1210         // HeapShared::roots() is copied specially, so it doesn't exist in
1211         // ArchiveHeapWriter::BufferOffsetToSourceObjectTable.
1212         // See ArchiveHeapWriter::copy_roots_to_buffer().
1213         st.print_cr("HeapShared::roots[%d]", HeapShared::pending_roots()->length());
1214         byte_size = ArchiveHeapWriter::heap_roots_word_size() * BytesPerWord;
1215       } else if ((byte_size = ArchiveHeapWriter::get_filler_size_at(start)) > 0) {
1216         // We have a filler oop, which also does not exist in BufferOffsetToSourceObjectTable.
1217         st.print_cr("filler " SIZE_FORMAT " bytes", byte_size);
1218       } else if ((permobj_segment = ArchiveHeapWriter::get_permobj_segment_at(start, &byte_size, &permobj_segment_length)) >= 0) {
1219         st.print_cr("permobj_%d[%d] %zu bytes", permobj_segment, permobj_segment_length, byte_size);
1220       } else {
1221         ShouldNotReachHere();
1222       }
1223 
1224       address oop_end = start + byte_size;
1225       log_as_hex(start, oop_end, requested_start, /*is_heap=*/true);
1226 
1227       if (source_oop != nullptr) {
1228         log_oop_details(heap_info, source_oop);
1229       } else if (start == ArchiveHeapWriter::buffered_heap_roots_addr()) {
1230         log_heap_roots();
1231       } else if (permobj_segment >= 0) {
1232         log_permobj_segment(permobj_segment, permobj_segment_length);
1233       }
1234       start = oop_end;
1235     }
1236   }
1237 
1238   // ArchivedFieldPrinter is used to print the fields of archived objects. We can't
1239   // use _source_obj->print_on(), because we want to print the oop fields
1240   // in _source_obj with their requested addresses using print_oop_with_requested_addr_cr().
1241   class ArchivedFieldPrinter : public FieldClosure {
1242     ArchiveHeapInfo* _heap_info;
1243     outputStream* _st;
1244     oop _source_obj;
1245   public:
1246     ArchivedFieldPrinter(ArchiveHeapInfo* heap_info, outputStream* st, oop src_obj) :
1247       _heap_info(heap_info), _st(st), _source_obj(src_obj) {}
1248 
1249     void do_field(fieldDescriptor* fd) {
1250       _st->print(" - ");
1251       BasicType ft = fd->field_type();
1252       switch (ft) {
1253       case T_ARRAY:
1254       case T_OBJECT:
1255         fd->print_on(_st); // print just the name and offset
1256         print_oop_with_requested_addr_cr(_st, _source_obj->obj_field(fd->offset()));
1257         break;
1258       default:
1259         if (ArchiveHeapWriter::is_marked_as_native_pointer(_heap_info, _source_obj, fd->offset())) {
1260           print_as_native_pointer(fd);
1261         } else {
1262           fd->print_on_for(_st, _source_obj); // name, offset, value
1263           _st->cr();
1264         }
1265       }
1266     }
1267 
1268     void print_as_native_pointer(fieldDescriptor* fd) {
1269       LP64_ONLY(assert(fd->field_type() == T_LONG, "must be"));
1270       NOT_LP64 (assert(fd->field_type() == T_INT,  "must be"));
1271 
1272       // We have a field that looks like an integer, but it's actually a pointer to a MetaspaceObj.
1273       address source_native_ptr = (address)
1274           LP64_ONLY(_source_obj->long_field(fd->offset()))
1275           NOT_LP64( _source_obj->int_field (fd->offset()));
1276       ArchiveBuilder* builder = ArchiveBuilder::current();
1277 
1278       // The value of the native pointer at runtime.
1279       address requested_native_ptr = builder->to_requested(builder->get_buffered_addr(source_native_ptr));
1280 
1281       // The address of _source_obj at runtime
1282       oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(_source_obj);
1283       // The address of this field in the requested space
1284       assert(requested_obj != nullptr, "Attempting to load field from null oop");
1285       address requested_field_addr = cast_from_oop<address>(requested_obj) + fd->offset();
1286 
1287       fd->print_on(_st);
1288       _st->print_cr(PTR_FORMAT " (marked metadata pointer @" PTR_FORMAT " )",
1289                     p2i(requested_native_ptr), p2i(requested_field_addr));
1290     }
1291   };
1292 
1293   // Print the fields of instanceOops, or the elements of arrayOops
1294   static void log_oop_details(ArchiveHeapInfo* heap_info, oop source_oop) {
1295     LogStreamHandle(Trace, cds, map, oops) st;
1296     if (st.is_enabled()) {
1297       Klass* source_klass = source_oop->klass();
1298       ArchiveBuilder* builder = ArchiveBuilder::current();
1299       Klass* requested_klass = builder->to_requested(builder->get_buffered_addr(source_klass));
1300 
1301       st.print(" - klass: ");
1302       source_klass->print_value_on(&st);
1303       st.print(" " PTR_FORMAT, p2i(requested_klass));
1304       st.cr();
1305 
1306       if (source_oop->is_typeArray()) {
1307         TypeArrayKlass::cast(source_klass)->oop_print_elements_on(typeArrayOop(source_oop), &st);
1308       } else if (source_oop->is_objArray()) {
1309         objArrayOop source_obj_array = objArrayOop(source_oop);
1310         for (int i = 0; i < source_obj_array->length(); i++) {
1311           st.print(" -%4d: ", i);
1312           print_oop_with_requested_addr_cr(&st, source_obj_array->obj_at(i));
1313         }
1314       } else {
1315         st.print_cr(" - fields (" SIZE_FORMAT " words):", source_oop->size());
1316         ArchivedFieldPrinter print_field(heap_info, &st, source_oop);
1317         InstanceKlass::cast(source_klass)->print_nonstatic_fields(&print_field);
1318       }
1319     }
1320   }
1321 
1322   static void log_heap_roots() {
1323     LogStreamHandle(Trace, cds, map, oops) st;
1324     if (st.is_enabled()) {
1325       for (int i = 0; i < HeapShared::pending_roots()->length(); i++) {
1326         st.print("roots[%4d]: ", i);
1327         print_oop_with_requested_addr_cr(&st, HeapShared::pending_roots()->at(i));
1328       }
1329     }
1330   }
1331 
1332   static void log_permobj_segment(int permobj_segment, int permobj_segment_length) {
1333     LogStreamHandle(Trace, cds, map, oops) st;
1334     if (st.is_enabled()) {
1335       for (int i = 0; i < permobj_segment_length; i++) {
1336         st.print("permobj_%d[%4d]: ", permobj_segment, i);
1337         print_oop_with_requested_addr_cr(&st, ArchiveHeapWriter::get_permobj_source_addr(permobj_segment, i));
1338       }
1339     }
1340   }
1341 
1342 
1343   // The output looks like this. The first number is the requested address. The second number is
1344   // the narrowOop version of the requested address.
1345   //     0x00000007ffc7e840 (0xfff8fd08) java.lang.Class
1346   //     0x00000007ffc000f8 (0xfff8001f) [B length: 11
1347   static void print_oop_with_requested_addr_cr(outputStream* st, oop source_oop, bool print_addr = true) {
1348     if (source_oop == nullptr) {
1349       st->print_cr("null");
1350     } else {
1351       ResourceMark rm;
1352       oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(source_oop);
1353       if (print_addr) {
1354         st->print(PTR_FORMAT " ", p2i(requested_obj));
1355       }
1356       if (UseCompressedOops) {
1357         st->print("(0x%08x) ", CompressedOops::narrow_oop_value(requested_obj));
1358       }
1359       if (source_oop->is_array()) {
1360         int array_len = arrayOop(source_oop)->length();
1361         st->print_cr("%s length: %d", source_oop->klass()->external_name(), array_len);
1362       } else {
1363         st->print("%s", source_oop->klass()->external_name());
1364         if (java_lang_invoke_MethodType::is_instance(source_oop)) {
1365           st->print(" ");
1366           java_lang_invoke_MethodType::print_signature(source_oop, st);
1367         }
1368         st->cr();
1369       }
1370     }
1371   }
1372 #endif // INCLUDE_CDS_JAVA_HEAP
1373 
1374   // Log all the data [base...top). Pretend that the base address
1375   // will be mapped to requested_base at run-time.
1376   static void log_as_hex(address base, address top, address requested_base, bool is_heap = false) {
1377     assert(top >= base, "must be");
1378 
1379     LogStreamHandle(Trace, cds, map) lsh;
1380     if (lsh.is_enabled()) {
1381       int unitsize = sizeof(address);
1382       if (is_heap && UseCompressedOops) {
1383         // This makes the compressed oop pointers easier to read, but
1384         // longs and doubles will be split into two words.
1385         unitsize = sizeof(narrowOop);
1386       }
1387       os::print_hex_dump(&lsh, base, top, unitsize, 32, requested_base);
1388     }
1389   }
1390 
1391   static void log_header(FileMapInfo* mapinfo) {
1392     LogStreamHandle(Info, cds, map) lsh;
1393     if (lsh.is_enabled()) {
1394       mapinfo->print(&lsh);
1395     }
1396   }
1397 
1398 public:
1399   static void log(ArchiveBuilder* builder, FileMapInfo* mapinfo,
1400                   ArchiveHeapInfo* heap_info,
1401                   char* bitmap, size_t bitmap_size_in_bytes) {
1402     log_info(cds, map)("%s CDS archive map for %s", CDSConfig::is_dumping_static_archive() ? "Static" : "Dynamic", mapinfo->full_path());
1403 
1404     address header = address(mapinfo->header());
1405     address header_end = header + mapinfo->header()->header_size();
1406     log_region("header", header, header_end, 0);
1407     log_header(mapinfo);
1408     log_as_hex(header, header_end, 0);
1409 
1410     DumpRegion* rw_region = &builder->_rw_region;
1411     DumpRegion* ro_region = &builder->_ro_region;
1412 
1413     log_metaspace_region("rw region", rw_region, &builder->_rw_src_objs);
1414     log_metaspace_region("ro region", ro_region, &builder->_ro_src_objs);
1415 
1416     address bitmap_end = address(bitmap + bitmap_size_in_bytes);
1417     log_region("bitmap", address(bitmap), bitmap_end, 0);
1418     log_as_hex((address)bitmap, bitmap_end, 0);
1419 
1420 #if INCLUDE_CDS_JAVA_HEAP
1421     if (heap_info->is_used()) {
1422       log_heap_region(heap_info);
1423     }
1424 #endif
1425 
1426     log_info(cds, map)("[End of CDS archive map]");
1427   }
1428 }; // end ArchiveBuilder::CDSMapLogger
1429 
1430 void ArchiveBuilder::print_stats() {
1431   _alloc_stats.print_stats(int(_ro_region.used()), int(_rw_region.used()));
1432 }
1433 
1434 void ArchiveBuilder::write_archive(FileMapInfo* mapinfo, ArchiveHeapInfo* heap_info) {
1435   // Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
1436   // MetaspaceShared::n_regions (internal to hotspot).
1437   assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
1438 
1439   write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
1440   write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
1441   write_region(mapinfo, MetaspaceShared::cc, &_cc_region, /*read_only=*/false,/*allow_exec=*/true);
1442 
1443   size_t bitmap_size_in_bytes;
1444   char* bitmap = mapinfo->write_bitmap_region(ArchivePtrMarker::ptrmap(), heap_info,
1445                                               bitmap_size_in_bytes);
1446 
1447   if (heap_info->is_used()) {
1448     _total_heap_region_size = mapinfo->write_heap_region(heap_info);
1449   }
1450 
1451   print_region_stats(mapinfo, heap_info);
1452 
1453   mapinfo->set_requested_base((char*)MetaspaceShared::requested_base_address());
1454   mapinfo->set_header_crc(mapinfo->compute_header_crc());
1455   // After this point, we should not write any data into mapinfo->header() since this
1456   // would corrupt its checksum we have calculated before.
1457   mapinfo->write_header();
1458   mapinfo->close();
1459 
1460   if (log_is_enabled(Info, cds)) {
1461     print_stats();
1462   }
1463 
1464   if (log_is_enabled(Info, cds, map)) {
1465     CDSMapLogger::log(this, mapinfo, heap_info,
1466                       bitmap, bitmap_size_in_bytes);
1467   }
1468   CDS_JAVA_HEAP_ONLY(HeapShared::destroy_archived_object_cache());
1469   FREE_C_HEAP_ARRAY(char, bitmap);
1470 }
1471 
1472 void ArchiveBuilder::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only,  bool allow_exec) {
1473   mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
1474 }
1475 
1476 void ArchiveBuilder::print_region_stats(FileMapInfo *mapinfo, ArchiveHeapInfo* heap_info) {
1477   // Print statistics of all the regions
1478   const size_t bitmap_used = mapinfo->region_at(MetaspaceShared::bm)->used();
1479   const size_t bitmap_reserved = mapinfo->region_at(MetaspaceShared::bm)->used_aligned();
1480   const size_t total_reserved = _ro_region.reserved()  + _rw_region.reserved() +
1481                                 bitmap_reserved +
1482                                 _total_heap_region_size;
1483   const size_t total_bytes = _ro_region.used()  + _rw_region.used() +
1484                              bitmap_used +
1485                              _total_heap_region_size;
1486   const double total_u_perc = percent_of(total_bytes, total_reserved);
1487 
1488   _rw_region.print(total_reserved);
1489   _ro_region.print(total_reserved);
1490   _cc_region.print(total_reserved);
1491 
1492   print_bitmap_region_stats(bitmap_used, total_reserved);
1493 
1494   if (heap_info->is_used()) {
1495     print_heap_region_stats(heap_info, total_reserved);
1496   }
1497 
1498   log_debug(cds)("total   : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
1499                  total_bytes, total_reserved, total_u_perc);
1500 }
1501 
1502 void ArchiveBuilder::print_bitmap_region_stats(size_t size, size_t total_size) {
1503   log_debug(cds)("bm space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used]",
1504                  size, size/double(total_size)*100.0, size);
1505 }
1506 
1507 void ArchiveBuilder::print_heap_region_stats(ArchiveHeapInfo *info, size_t total_size) {
1508   char* start = info->buffer_start();
1509   size_t size = info->buffer_byte_size();
1510   char* top = start + size;
1511   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,
1512                      size, size/double(total_size)*100.0, size, p2i(start));
1513 }
1514 
1515 void ArchiveBuilder::report_out_of_space(const char* name, size_t needed_bytes) {
1516   // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
1517   // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
1518   // or so.
1519   _rw_region.print_out_of_space_msg(name, needed_bytes);
1520   _ro_region.print_out_of_space_msg(name, needed_bytes);
1521 
1522   log_error(cds)("Unable to allocate from '%s' region: Please reduce the number of shared classes.", name);
1523   MetaspaceShared::unrecoverable_writing_error();
1524 }