1 /*
   2  * Copyright (c) 2018, 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 "classfile/javaClasses.inline.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "logging/log.hpp"
  29 #include "logging/logMessage.hpp"
  30 #include "logging/logStream.hpp"
  31 #include "memory/heapShared.hpp"
  32 #include "memory/iterator.inline.hpp"
  33 #include "memory/metadataFactory.hpp"
  34 #include "memory/metaspaceClosure.hpp"
  35 #include "memory/metaspaceShared.hpp"
  36 #include "memory/resourceArea.hpp"
  37 #include "oops/compressedOops.inline.hpp"
  38 #include "oops/oop.inline.hpp"
  39 
  40 #if INCLUDE_CDS_JAVA_HEAP
  41 KlassSubGraphInfo* HeapShared::_subgraph_info_list = NULL;
  42 int HeapShared::_num_archived_subgraph_info_records = 0;
  43 Array<ArchivedKlassSubGraphInfoRecord>* HeapShared::_archived_subgraph_info_records = NULL;
  44 
  45 // Currently there is only one class mirror (ArchivedModuleGraph) with archived
  46 // sub-graphs.
  47 KlassSubGraphInfo* HeapShared::find_subgraph_info(Klass* k) {
  48   KlassSubGraphInfo* info = _subgraph_info_list;
  49   while (info != NULL) {
  50     if (info->klass() == k) {
  51       return info;
  52     }
  53     info = info->next();
  54   }
  55   return NULL;
  56 }
  57 
  58 // Get the subgraph_info for Klass k. A new subgraph_info is created if
  59 // there is no existing one for k. The subgraph_info records the relocated
  60 // Klass* of the original k.
  61 KlassSubGraphInfo* HeapShared::get_subgraph_info(Klass* k) {
  62   Klass* relocated_k = MetaspaceShared::get_relocated_klass(k);
  63   KlassSubGraphInfo* info = find_subgraph_info(relocated_k);
  64   if (info != NULL) {
  65     return info;
  66   }
  67 
  68   info = new KlassSubGraphInfo(relocated_k, _subgraph_info_list);
  69   _subgraph_info_list = info;
  70   return info;
  71 }
  72 
  73 int HeapShared::num_of_subgraph_infos() {
  74   int num = 0;
  75   KlassSubGraphInfo* info = _subgraph_info_list;
  76   while (info != NULL) {
  77     num ++;
  78     info = info->next();
  79   }
  80   return num;
  81 }
  82 
  83 // Add an entry field to the current KlassSubGraphInfo.
  84 void KlassSubGraphInfo::add_subgraph_entry_field(int static_field_offset, oop v) {
  85   assert(DumpSharedSpaces, "dump time only");
  86   if (_subgraph_entry_fields == NULL) {
  87     _subgraph_entry_fields =
  88       new(ResourceObj::C_HEAP, mtClass) GrowableArray<juint>(10, true);
  89   }
  90   _subgraph_entry_fields->append((juint)static_field_offset);
  91   _subgraph_entry_fields->append(CompressedOops::encode(v));
  92 }
  93 
  94 // Add the Klass* for an object in the current KlassSubGraphInfo's subgraphs.
  95 // Only objects of boot classes can be included in sub-graph.
  96 void KlassSubGraphInfo::add_subgraph_object_klass(Klass* orig_k, Klass *relocated_k) {
  97   assert(DumpSharedSpaces, "dump time only");
  98   assert(relocated_k == MetaspaceShared::get_relocated_klass(orig_k),
  99          "must be the relocated Klass in the shared space");
 100 
 101   if (_subgraph_object_klasses == NULL) {
 102     _subgraph_object_klasses =
 103       new(ResourceObj::C_HEAP, mtClass) GrowableArray<Klass*>(50, true);
 104   }
 105 
 106   assert(relocated_k->is_shared(), "must be a shared class");
 107 
 108   if (_k == relocated_k) {
 109     // Don't add the Klass containing the sub-graph to it's own klass
 110     // initialization list.
 111     return;
 112   }
 113 
 114   if (relocated_k->is_instance_klass()) {
 115     assert(InstanceKlass::cast(relocated_k)->is_shared_boot_class(),
 116           "must be boot class");
 117     // SystemDictionary::xxx_klass() are not updated, need to check
 118     // the original Klass*
 119     if (orig_k == SystemDictionary::String_klass() ||
 120         orig_k == SystemDictionary::Object_klass()) {
 121       // Initialized early during VM initialization. No need to be added
 122       // to the sub-graph object class list.
 123       return;
 124     }
 125   } else if (relocated_k->is_objArray_klass()) {
 126     Klass* abk = ObjArrayKlass::cast(relocated_k)->bottom_klass();
 127     if (abk->is_instance_klass()) {
 128       assert(InstanceKlass::cast(abk)->is_shared_boot_class(),
 129             "must be boot class");
 130     }
 131     if (relocated_k == Universe::objectArrayKlassObj()) {
 132       // Initialized early during Universe::genesis. No need to be added
 133       // to the list.
 134       return;
 135     }
 136   } else {
 137     assert(relocated_k->is_typeArray_klass(), "must be");
 138     // Primitive type arrays are created early during Universe::genesis.
 139     return;
 140   }
 141 
 142   _subgraph_object_klasses->append_if_missing(relocated_k);
 143 }
 144 
 145 // Initialize an archived subgraph_info_record from the given KlassSubGraphInfo.
 146 void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) {
 147   _k = info->klass();
 148   _next = NULL;
 149   _entry_field_records = NULL;
 150   _subgraph_klasses = NULL;
 151 
 152   // populate the entry fields
 153   GrowableArray<juint>* entry_fields = info->subgraph_entry_fields();
 154   if (entry_fields != NULL) {
 155     int num_entry_fields = entry_fields->length();
 156     assert(num_entry_fields % 2 == 0, "sanity");
 157     _entry_field_records =
 158       MetaspaceShared::new_ro_array<juint>(num_entry_fields);
 159     for (int i = 0 ; i < num_entry_fields; i++) {
 160       _entry_field_records->at_put(i, entry_fields->at(i));
 161     }
 162   }
 163 
 164   // the Klasses of the objects in the sub-graphs
 165   GrowableArray<Klass*>* subgraph_klasses = info->subgraph_object_klasses();
 166   if (subgraph_klasses != NULL) {
 167     int num_subgraphs_klasses = subgraph_klasses->length();
 168     _subgraph_klasses =
 169       MetaspaceShared::new_ro_array<Klass*>(num_subgraphs_klasses);
 170     for (int i = 0; i < num_subgraphs_klasses; i++) {
 171       Klass* subgraph_k = subgraph_klasses->at(i);
 172       if (log_is_enabled(Info, cds, heap)) {
 173         ResourceMark rm;
 174         log_info(cds, heap)(
 175           "Archived object klass (%d): %s in %s sub-graphs",
 176           i, subgraph_k->external_name(), _k->external_name());
 177       }
 178       _subgraph_klasses->at_put(i, subgraph_k);
 179     }
 180   }
 181 }
 182 
 183 // Build the records of archived subgraph infos, which include:
 184 // - Entry points to all subgraphs from the containing class mirror. The entry
 185 //   points are static fields in the mirror. For each entry point, the field
 186 //   offset and value are recorded in the sub-graph info. The value are stored
 187 //   back to the corresponding field at runtime.
 188 // - A list of klasses that need to be loaded/initialized before archived
 189 //   java object sub-graph can be accessed at runtime.
 190 //
 191 // The records are saved in the archive file and reloaded at runtime. Currently
 192 // there is only one class mirror (ArchivedModuleGraph) with archived sub-graphs.
 193 //
 194 // Layout of the archived subgraph info records:
 195 //
 196 // records_size | num_records | records*
 197 // ArchivedKlassSubGraphInfoRecord | entry_fields | subgraph_object_klasses
 198 size_t HeapShared::build_archived_subgraph_info_records(int num_records) {
 199   // remember the start address
 200   char* start_p = MetaspaceShared::read_only_space_top();
 201 
 202   // now populate the archived subgraph infos, which will be saved in the
 203   // archive file
 204   _archived_subgraph_info_records =
 205     MetaspaceShared::new_ro_array<ArchivedKlassSubGraphInfoRecord>(num_records);
 206   KlassSubGraphInfo* info = _subgraph_info_list;
 207   int i = 0;
 208   while (info != NULL) {
 209     assert(i < _archived_subgraph_info_records->length(), "sanity");
 210     ArchivedKlassSubGraphInfoRecord* record =
 211       _archived_subgraph_info_records->adr_at(i);
 212     record->init(info);
 213     info = info->next();
 214     i ++;
 215   }
 216 
 217   // _subgraph_info_list is no longer needed
 218   delete _subgraph_info_list;
 219   _subgraph_info_list = NULL;
 220 
 221   char* end_p = MetaspaceShared::read_only_space_top();
 222   size_t records_size = end_p - start_p;
 223   return records_size;
 224 }
 225 
 226 // Write the subgraph info records in the shared _ro region
 227 void HeapShared::write_archived_subgraph_infos() {
 228   assert(DumpSharedSpaces, "dump time only");
 229 
 230   Array<intptr_t>* records_header = MetaspaceShared::new_ro_array<intptr_t>(3);
 231 
 232   _num_archived_subgraph_info_records = num_of_subgraph_infos();
 233   size_t records_size = build_archived_subgraph_info_records(
 234                              _num_archived_subgraph_info_records);
 235 
 236   // Now write the header information:
 237   // records_size, num_records, _archived_subgraph_info_records
 238   assert(records_header != NULL, "sanity");
 239   intptr_t* p = (intptr_t*)(records_header->data());
 240   *p = (intptr_t)records_size;
 241   p ++;
 242   *p = (intptr_t)_num_archived_subgraph_info_records;
 243   p ++;
 244   *p = (intptr_t)_archived_subgraph_info_records;
 245 }
 246 
 247 char* HeapShared::read_archived_subgraph_infos(char* buffer) {
 248   Array<intptr_t>* records_header = (Array<intptr_t>*)buffer;
 249   intptr_t* p = (intptr_t*)(records_header->data());
 250   size_t records_size = (size_t)(*p);
 251   p ++;
 252   _num_archived_subgraph_info_records = *p;
 253   p ++;
 254   _archived_subgraph_info_records =
 255     (Array<ArchivedKlassSubGraphInfoRecord>*)(*p);
 256 
 257   buffer = (char*)_archived_subgraph_info_records + records_size;
 258   return buffer;
 259 }
 260 
 261 void HeapShared::initialize_from_archived_subgraph(Klass* k) {
 262   if (!MetaspaceShared::open_archive_heap_region_mapped()) {
 263     return; // nothing to do
 264   }
 265 
 266   if (_num_archived_subgraph_info_records == 0) {
 267     return; // no subgraph info records
 268   }
 269 
 270   // Initialize from archived data. Currently only ArchivedModuleGraph
 271   // has archived object subgraphs, which is used during VM initialization
 272   // time when bootstraping the system modules. No lock is needed.
 273   Thread* THREAD = Thread::current();
 274   for (int i = 0; i < _archived_subgraph_info_records->length(); i++) {
 275     ArchivedKlassSubGraphInfoRecord* record = _archived_subgraph_info_records->adr_at(i);
 276     if (record->klass() == k) {
 277       int i;
 278       // Found the archived subgraph info record for the requesting klass.
 279       // Load/link/initialize the klasses of the objects in the subgraph.
 280       // NULL class loader is used.
 281       Array<Klass*>* klasses = record->subgraph_klasses();
 282       if (klasses != NULL) {
 283         for (i = 0; i < klasses->length(); i++) {
 284           Klass* obj_k = klasses->at(i);
 285           Klass* resolved_k = SystemDictionary::resolve_or_null(
 286                                                 (obj_k)->name(), THREAD);
 287           if (resolved_k != obj_k) {
 288             return;
 289           }
 290           if ((obj_k)->is_instance_klass()) {
 291             InstanceKlass* ik = InstanceKlass::cast(obj_k);
 292             ik->initialize(THREAD);
 293           } else if ((obj_k)->is_objArray_klass()) {
 294             ObjArrayKlass* oak = ObjArrayKlass::cast(obj_k);
 295             oak->initialize(THREAD);
 296           }
 297         }
 298       }
 299 
 300       if (HAS_PENDING_EXCEPTION) {
 301         CLEAR_PENDING_EXCEPTION;
 302         // None of the field value will be set if there was an exception.
 303         // The java code will not see any of the archived objects in the
 304         // subgraphs referenced from k in this case.
 305         return;
 306       }
 307 
 308       // Load the subgraph entry fields from the record and store them back to
 309       // the corresponding fields within the mirror.
 310       oop m = k->java_mirror();
 311       Array<juint>* entry_field_records = record->entry_field_records();
 312       if (entry_field_records != NULL) {
 313         int efr_len = entry_field_records->length();
 314         assert(efr_len % 2 == 0, "sanity");
 315         for (i = 0; i < efr_len;) {
 316           int field_offset = entry_field_records->at(i);
 317           // The object refereced by the field becomes 'known' by GC from this
 318           // point. All objects in the subgraph reachable from the object are
 319           // also 'known' by GC.
 320           oop v = MetaspaceShared::materialize_archived_object(
 321             CompressedOops::decode(entry_field_records->at(i+1)));
 322           m->obj_field_put(field_offset, v);
 323           i += 2;
 324         }
 325       }
 326 
 327       // Done. Java code can see the archived sub-graphs referenced from k's
 328       // mirror after this point.
 329       return;
 330     }
 331   }
 332 }
 333 
 334 class WalkOopAndArchiveClosure: public BasicOopIterateClosure {
 335   int _level;
 336   KlassSubGraphInfo* _subgraph_info;
 337   oop _orig_referencing_obj;
 338   oop _archived_referencing_obj;
 339  public:
 340   WalkOopAndArchiveClosure(int level, KlassSubGraphInfo* subgraph_info,
 341            oop orig, oop archived) : _level(level),
 342                                      _subgraph_info(subgraph_info),
 343                                      _orig_referencing_obj(orig),
 344                                      _archived_referencing_obj(archived) {}
 345   void do_oop(narrowOop *p) { WalkOopAndArchiveClosure::do_oop_work(p); }
 346   void do_oop(      oop *p) { WalkOopAndArchiveClosure::do_oop_work(p); }
 347 
 348  protected:
 349   template <class T> void do_oop_work(T *p) {
 350     oop obj = RawAccess<>::oop_load(p);
 351     if (!CompressedOops::is_null(obj)) {
 352       // A java.lang.Class instance can not be included in an archived
 353       // object sub-graph.
 354       if (java_lang_Class::is_instance(obj)) {
 355         log_error(cds, heap)("Unknown java.lang.Class object is in the archived sub-graph\n");
 356         vm_exit(1);
 357       }
 358 
 359       LogTarget(Debug, cds, heap) log;
 360       LogStream ls(log);
 361       outputStream* out = &ls;
 362       {
 363         ResourceMark rm;
 364         log.print("(%d) %s <--- referenced from:  %s",
 365                   _level, obj->klass()->external_name(),
 366                   CompressedOops::is_null(_orig_referencing_obj) ?
 367                          "" : _orig_referencing_obj->klass()->external_name());
 368         obj->print_on(out);
 369       }
 370 
 371       if (MetaspaceShared::is_archive_object(obj)) {
 372         // The current oop is an archived oop, nothing needs to be done
 373         log.print("--- object is already archived ---");
 374         return;
 375       }
 376 
 377       size_t field_delta = pointer_delta(
 378         p, _orig_referencing_obj, sizeof(char));
 379       T* new_p = (T*)(address(_archived_referencing_obj) + field_delta);
 380       oop archived = MetaspaceShared::find_archived_heap_object(obj);
 381       if (archived != NULL) {
 382         // There is an archived copy existing, update reference to point
 383         // to the archived copy
 384         RawAccess<IS_NOT_NULL>::oop_store(new_p, archived);
 385         log.print(
 386           "--- found existing archived copy, store archived " PTR_FORMAT " in " PTR_FORMAT,
 387           p2i(archived), p2i(new_p));
 388         return;
 389       }
 390 
 391       int l = _level + 1;
 392       Thread* THREAD = Thread::current();
 393       // Archive the current oop before iterating through its references
 394       archived = MetaspaceShared::archive_heap_object(obj, THREAD);
 395       if (archived == NULL) {
 396         ResourceMark rm;
 397         LogTarget(Error, cds, heap) log_err;
 398         LogStream ls_err(log_err);
 399         outputStream* out_err = &ls_err;
 400         log_err.print("Failed to archive %s object ("
 401                       PTR_FORMAT "), size[" SIZE_FORMAT "] in sub-graph",
 402                       obj->klass()->external_name(), p2i(obj), (size_t)obj->size());
 403         obj->print_on(out_err);
 404         vm_exit(1);
 405       }
 406       assert(MetaspaceShared::is_archive_object(archived), "must be archived");
 407       log.print("=== archiving oop " PTR_FORMAT " ==> " PTR_FORMAT,
 408                  p2i(obj), p2i(archived));
 409 
 410       // Following the references in the current oop and archive any
 411       // encountered objects during the process
 412       WalkOopAndArchiveClosure walker(l, _subgraph_info, obj, archived);
 413       obj->oop_iterate(&walker);
 414 
 415       // Update the reference in the archived copy of the referencing object
 416       RawAccess<IS_NOT_NULL>::oop_store(new_p, archived);
 417       log.print("=== store archived " PTR_FORMAT " in " PTR_FORMAT,
 418                 p2i(archived), p2i(new_p));
 419 
 420       // Add the klass to the list of classes that need to be loaded before
 421       // module system initialization
 422       Klass *orig_k = obj->klass();
 423       Klass *relocated_k = archived->klass();
 424       _subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
 425     }
 426   }
 427 };
 428 
 429 //
 430 // Start from the given static field in a java mirror and archive the
 431 // complete sub-graph of java heap objects that are reached directly
 432 // or indirectly from the starting object by following references.
 433 // Currently, only ArchivedModuleGraph class instance (mirror) has archived
 434 // object subgraphs. Sub-graph archiving restrictions (current):
 435 //
 436 // - All classes of objects in the archived sub-graph (including the
 437 //   entry class) must be boot class only.
 438 // - No java.lang.Class instance (java mirror) can be included inside
 439 //   an archived sub-graph. Mirror can only be the sub-graph entry object.
 440 //
 441 // The Java heap object sub-graph archiving process (see
 442 // WalkOopAndArchiveClosure):
 443 //
 444 // 1) Java object sub-graph archiving starts from a given static field
 445 // within a Class instance (java mirror). If the static field is a
 446 // refererence field and points to a non-null java object, proceed to
 447 // the next step.
 448 //
 449 // 2) Archives the referenced java object. If an archived copy of the
 450 // current object already exists, updates the pointer in the archived
 451 // copy of the referencing object to point to the current archived object.
 452 // Otherwise, proceed to the next step.
 453 //
 454 // 3) Follows all references within the current java object and recursively
 455 // archive the sub-graph of objects starting from each reference.
 456 //
 457 // 4) Updates the pointer in the archived copy of referencing object to
 458 //    point to the current archived object.
 459 //
 460 // 5) The Klass of the current java object is added to the list of Klasses
 461 // for loading and initialzing before any object in the archived graph can
 462 // be accessed at runtime.
 463 //
 464 void HeapShared::archive_reachable_objects_from_static_field(Klass *k,
 465                                                              int field_offset,
 466                                                              BasicType field_type,
 467                                                              TRAPS) {
 468   assert(DumpSharedSpaces, "dump time only");
 469   assert(k->is_instance_klass(), "sanity");
 470   assert(InstanceKlass::cast(k)->is_shared_boot_class(),
 471          "must be boot class");
 472 
 473   oop m = k->java_mirror();
 474   oop archived_m = MetaspaceShared::find_archived_heap_object(m);
 475   if (CompressedOops::is_null(archived_m)) {
 476     return;
 477   }
 478 
 479   if (field_type == T_OBJECT) {
 480     // obtain k's subGraph Info
 481     KlassSubGraphInfo* subgraph_info = get_subgraph_info(k);
 482 
 483     // get the object referenced by the field
 484     oop f = m->obj_field(field_offset);
 485     if (!CompressedOops::is_null(f)) {
 486       LogTarget(Debug, cds, heap) log;
 487       LogStream ls(log);
 488       outputStream* out = &ls;
 489       log.print("Start from: ");
 490       f->print_on(out);
 491 
 492       // get the archived copy of the field referenced object
 493       oop af = MetaspaceShared::archive_heap_object(f, THREAD);
 494       if (af == NULL) {
 495         // Skip archiving the sub-graph referenced from the current entry field.
 496         ResourceMark rm;
 497         log_info(cds, heap)(
 498           "Cannot archive the sub-graph referenced from %s object ("
 499           PTR_FORMAT ") size[" SIZE_FORMAT "], skipped.",
 500           f->klass()->external_name(), p2i(f), (size_t)f->size());
 501         return;
 502       }
 503       if (!MetaspaceShared::is_archive_object(f)) {
 504         WalkOopAndArchiveClosure walker(1, subgraph_info, f, af);
 505         f->oop_iterate(&walker);
 506       }
 507 
 508       // The field value is not preserved in the archived mirror.
 509       // Record the field as a new subGraph entry point. The recorded
 510       // information is restored from the archive at runtime.
 511       subgraph_info->add_subgraph_entry_field(field_offset, af);
 512       Klass *relocated_k = af->klass();
 513       Klass *orig_k = f->klass();
 514       subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
 515       ResourceMark rm;
 516       log_info(cds, heap)(
 517           "Archived the sub-graph referenced from %s object " PTR_FORMAT,
 518           f->klass()->external_name(), p2i(f));
 519     } else {
 520       // The field contains null, we still need to record the entry point,
 521       // so it can be restored at runtime.
 522       subgraph_info->add_subgraph_entry_field(field_offset, NULL);
 523     }
 524   } else {
 525     ShouldNotReachHere();
 526   }
 527 }
 528 
 529 #define do_module_object_graph(archive_object_graph_do) \
 530   archive_object_graph_do(SystemDictionary::ArchivedModuleGraph_klass(), jdk_internal_module_ArchivedModuleGraph::archivedSystemModules_offset(), T_OBJECT, CHECK); \
 531   archive_object_graph_do(SystemDictionary::ArchivedModuleGraph_klass(), jdk_internal_module_ArchivedModuleGraph::archivedModuleFinder_offset(), T_OBJECT, CHECK); \
 532   archive_object_graph_do(SystemDictionary::ArchivedModuleGraph_klass(), jdk_internal_module_ArchivedModuleGraph::archivedMainModule_offset(), T_OBJECT, CHECK); \
 533   archive_object_graph_do(SystemDictionary::ArchivedModuleGraph_klass(), jdk_internal_module_ArchivedModuleGraph::archivedConfiguration_offset(), T_OBJECT, CHECK); \
 534   archive_object_graph_do(SystemDictionary::ImmutableCollections_ListN_klass(), java_util_ImmutableCollections_ListN::EMPTY_LIST_offset(), T_OBJECT, CHECK); \
 535   archive_object_graph_do(SystemDictionary::ImmutableCollections_MapN_klass(),  java_util_ImmutableCollections_MapN::EMPTY_MAP_offset(), T_OBJECT, CHECK); \
 536   archive_object_graph_do(SystemDictionary::ImmutableCollections_SetN_klass(),  java_util_ImmutableCollections_SetN::EMPTY_SET_offset(), T_OBJECT, CHECK); \
 537   archive_object_graph_do(SystemDictionary::Integer_IntegerCache_klass(), java_lang_Integer_IntegerCache::archivedCache_offset(), T_OBJECT, CHECK); \
 538   archive_object_graph_do(SystemDictionary::Configuration_klass(),       java_lang_module_Configuration::EMPTY_CONFIGURATION_offset(), T_OBJECT, CHECK)
 539 
 540 void HeapShared::archive_module_graph_objects(Thread* THREAD) {
 541   do_module_object_graph(archive_reachable_objects_from_static_field);
 542 }
 543 #endif // INCLUDE_CDS_JAVA_HEAP
--- EOF ---