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src/hotspot/share/cds/heapShared.cpp

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  43 #include "gc/shared/gcLocker.hpp"
  44 #include "gc/shared/gcVMOperations.hpp"
  45 #include "logging/log.hpp"
  46 #include "logging/logStream.hpp"
  47 #include "memory/iterator.inline.hpp"
  48 #include "memory/metadataFactory.hpp"
  49 #include "memory/metaspaceClosure.hpp"
  50 #include "memory/resourceArea.hpp"
  51 #include "memory/universe.hpp"
  52 #include "oops/compressedOops.inline.hpp"
  53 #include "oops/fieldStreams.inline.hpp"
  54 #include "oops/objArrayOop.inline.hpp"
  55 #include "oops/oop.inline.hpp"
  56 #include "oops/typeArrayOop.inline.hpp"
  57 #include "prims/jvmtiExport.hpp"
  58 #include "runtime/fieldDescriptor.inline.hpp"
  59 #include "runtime/globals_extension.hpp"
  60 #include "runtime/init.hpp"
  61 #include "runtime/java.hpp"
  62 #include "runtime/javaCalls.hpp"

  63 #include "runtime/safepointVerifiers.hpp"
  64 #include "utilities/bitMap.inline.hpp"
  65 #include "utilities/copy.hpp"
  66 #if INCLUDE_G1GC
  67 #include "gc/g1/g1CollectedHeap.hpp"
  68 #endif
  69 
  70 #if INCLUDE_CDS_JAVA_HEAP
  71 
  72 bool HeapShared::_closed_regions_mapped = false;
  73 bool HeapShared::_open_regions_mapped = false;
  74 bool HeapShared::_is_loaded = false;
  75 bool HeapShared::_disable_writing = false;
  76 address   HeapShared::_narrow_oop_base;
  77 int       HeapShared::_narrow_oop_shift;
  78 DumpedInternedStrings *HeapShared::_dumped_interned_strings = NULL;
  79 
  80 // Support for loaded heap.
  81 uintptr_t HeapShared::_loaded_heap_bottom = 0;
  82 uintptr_t HeapShared::_loaded_heap_top = 0;

 310     return ao;
 311   }
 312 
 313   int len = obj->size();
 314   if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) {
 315     log_debug(cds, heap)("Cannot archive, object (" PTR_FORMAT ") is too large: " SIZE_FORMAT,
 316                          p2i(obj), (size_t)obj->size());
 317     return NULL;
 318   }
 319 
 320   oop archived_oop = cast_to_oop(G1CollectedHeap::heap()->archive_mem_allocate(len));
 321   if (archived_oop != NULL) {
 322     Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(obj), cast_from_oop<HeapWord*>(archived_oop), len);
 323     // Reinitialize markword to remove age/marking/locking/etc.
 324     //
 325     // We need to retain the identity_hash, because it may have been used by some hashtables
 326     // in the shared heap. This also has the side effect of pre-initializing the
 327     // identity_hash for all shared objects, so they are less likely to be written
 328     // into during run time, increasing the potential of memory sharing.
 329     int hash_original = obj->identity_hash();
 330     archived_oop->set_mark(markWord::prototype().copy_set_hash(hash_original));







 331     assert(archived_oop->mark().is_unlocked(), "sanity");
 332 
 333     DEBUG_ONLY(int hash_archived = archived_oop->identity_hash());
 334     assert(hash_original == hash_archived, "Different hash codes: original %x, archived %x", hash_original, hash_archived);
 335 
 336     ArchivedObjectCache* cache = archived_object_cache();
 337     CachedOopInfo info = make_cached_oop_info(archived_oop);
 338     cache->put(obj, info);
 339     if (_original_object_table != NULL) {
 340       _original_object_table->put(archived_oop, obj);
 341     }
 342     if (log_is_enabled(Debug, cds, heap)) {
 343       ResourceMark rm;
 344       log_debug(cds, heap)("Archived heap object " PTR_FORMAT " ==> " PTR_FORMAT " : %s",
 345                            p2i(obj), p2i(archived_oop), obj->klass()->external_name());
 346     }
 347   } else {
 348     log_error(cds, heap)(
 349       "Cannot allocate space for object " PTR_FORMAT " in archived heap region",
 350       p2i(obj));

 550   G1CollectedHeap::heap()->end_archive_alloc_range(open_regions,
 551                                                    os::vm_allocation_granularity());
 552 }
 553 
 554 // Copy _pending_archive_roots into an objArray
 555 void HeapShared::copy_roots() {
 556   // HeapShared::roots() points into an ObjArray in the open archive region. A portion of the
 557   // objects in this array are discovered during HeapShared::archive_objects(). For example,
 558   // in HeapShared::archive_reachable_objects_from() ->  HeapShared::check_enum_obj().
 559   // However, HeapShared::archive_objects() happens inside a safepoint, so we can't
 560   // allocate a "regular" ObjArray and pass the result to HeapShared::archive_object().
 561   // Instead, we have to roll our own alloc/copy routine here.
 562   int length = _pending_roots != NULL ? _pending_roots->length() : 0;
 563   size_t size = objArrayOopDesc::object_size(length);
 564   Klass* k = Universe::objectArrayKlassObj(); // already relocated to point to archived klass
 565   HeapWord* mem = G1CollectedHeap::heap()->archive_mem_allocate(size);
 566 
 567   memset(mem, 0, size * BytesPerWord);
 568   {
 569     // This is copied from MemAllocator::finish
 570     oopDesc::set_mark(mem, markWord::prototype());

 571     oopDesc::release_set_klass(mem, k);

 572   }
 573   {
 574     // This is copied from ObjArrayAllocator::initialize
 575     arrayOopDesc::set_length(mem, length);
 576   }
 577 
 578   _roots = OopHandle(Universe::vm_global(), cast_to_oop(mem));
 579   for (int i = 0; i < length; i++) {
 580     roots()->obj_at_put(i, _pending_roots->at(i));
 581   }
 582   log_info(cds)("archived obj roots[%d] = " SIZE_FORMAT " words, klass = %p, obj = %p", length, size, k, mem);
 583 }
 584 
 585 void HeapShared::init_narrow_oop_decoding(address base, int shift) {
 586   _narrow_oop_base = base;
 587   _narrow_oop_shift = shift;
 588 }
 589 
 590 //
 591 // Subgraph archiving support

  43 #include "gc/shared/gcLocker.hpp"
  44 #include "gc/shared/gcVMOperations.hpp"
  45 #include "logging/log.hpp"
  46 #include "logging/logStream.hpp"
  47 #include "memory/iterator.inline.hpp"
  48 #include "memory/metadataFactory.hpp"
  49 #include "memory/metaspaceClosure.hpp"
  50 #include "memory/resourceArea.hpp"
  51 #include "memory/universe.hpp"
  52 #include "oops/compressedOops.inline.hpp"
  53 #include "oops/fieldStreams.inline.hpp"
  54 #include "oops/objArrayOop.inline.hpp"
  55 #include "oops/oop.inline.hpp"
  56 #include "oops/typeArrayOop.inline.hpp"
  57 #include "prims/jvmtiExport.hpp"
  58 #include "runtime/fieldDescriptor.inline.hpp"
  59 #include "runtime/globals_extension.hpp"
  60 #include "runtime/init.hpp"
  61 #include "runtime/java.hpp"
  62 #include "runtime/javaCalls.hpp"
  63 #include "runtime/safepoint.hpp"
  64 #include "runtime/safepointVerifiers.hpp"
  65 #include "utilities/bitMap.inline.hpp"
  66 #include "utilities/copy.hpp"
  67 #if INCLUDE_G1GC
  68 #include "gc/g1/g1CollectedHeap.hpp"
  69 #endif
  70 
  71 #if INCLUDE_CDS_JAVA_HEAP
  72 
  73 bool HeapShared::_closed_regions_mapped = false;
  74 bool HeapShared::_open_regions_mapped = false;
  75 bool HeapShared::_is_loaded = false;
  76 bool HeapShared::_disable_writing = false;
  77 address   HeapShared::_narrow_oop_base;
  78 int       HeapShared::_narrow_oop_shift;
  79 DumpedInternedStrings *HeapShared::_dumped_interned_strings = NULL;
  80 
  81 // Support for loaded heap.
  82 uintptr_t HeapShared::_loaded_heap_bottom = 0;
  83 uintptr_t HeapShared::_loaded_heap_top = 0;

 311     return ao;
 312   }
 313 
 314   int len = obj->size();
 315   if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) {
 316     log_debug(cds, heap)("Cannot archive, object (" PTR_FORMAT ") is too large: " SIZE_FORMAT,
 317                          p2i(obj), (size_t)obj->size());
 318     return NULL;
 319   }
 320 
 321   oop archived_oop = cast_to_oop(G1CollectedHeap::heap()->archive_mem_allocate(len));
 322   if (archived_oop != NULL) {
 323     Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(obj), cast_from_oop<HeapWord*>(archived_oop), len);
 324     // Reinitialize markword to remove age/marking/locking/etc.
 325     //
 326     // We need to retain the identity_hash, because it may have been used by some hashtables
 327     // in the shared heap. This also has the side effect of pre-initializing the
 328     // identity_hash for all shared objects, so they are less likely to be written
 329     // into during run time, increasing the potential of memory sharing.
 330     int hash_original = obj->identity_hash();
 331 
 332     assert(SafepointSynchronize::is_at_safepoint(), "resolving displaced headers only at safepoint");
 333     markWord mark = obj->mark();
 334     if (mark.has_displaced_mark_helper()) {
 335       mark = mark.displaced_mark_helper();
 336     }
 337     narrowKlass nklass = mark.narrow_klass();
 338     archived_oop->set_mark(markWord::prototype().copy_set_hash(hash_original) LP64_ONLY(.set_narrow_klass(nklass)));
 339     assert(archived_oop->mark().is_unlocked(), "sanity");
 340 
 341     DEBUG_ONLY(int hash_archived = archived_oop->identity_hash());
 342     assert(hash_original == hash_archived, "Different hash codes: original %x, archived %x", hash_original, hash_archived);
 343 
 344     ArchivedObjectCache* cache = archived_object_cache();
 345     CachedOopInfo info = make_cached_oop_info(archived_oop);
 346     cache->put(obj, info);
 347     if (_original_object_table != NULL) {
 348       _original_object_table->put(archived_oop, obj);
 349     }
 350     if (log_is_enabled(Debug, cds, heap)) {
 351       ResourceMark rm;
 352       log_debug(cds, heap)("Archived heap object " PTR_FORMAT " ==> " PTR_FORMAT " : %s",
 353                            p2i(obj), p2i(archived_oop), obj->klass()->external_name());
 354     }
 355   } else {
 356     log_error(cds, heap)(
 357       "Cannot allocate space for object " PTR_FORMAT " in archived heap region",
 358       p2i(obj));

 558   G1CollectedHeap::heap()->end_archive_alloc_range(open_regions,
 559                                                    os::vm_allocation_granularity());
 560 }
 561 
 562 // Copy _pending_archive_roots into an objArray
 563 void HeapShared::copy_roots() {
 564   // HeapShared::roots() points into an ObjArray in the open archive region. A portion of the
 565   // objects in this array are discovered during HeapShared::archive_objects(). For example,
 566   // in HeapShared::archive_reachable_objects_from() ->  HeapShared::check_enum_obj().
 567   // However, HeapShared::archive_objects() happens inside a safepoint, so we can't
 568   // allocate a "regular" ObjArray and pass the result to HeapShared::archive_object().
 569   // Instead, we have to roll our own alloc/copy routine here.
 570   int length = _pending_roots != NULL ? _pending_roots->length() : 0;
 571   size_t size = objArrayOopDesc::object_size(length);
 572   Klass* k = Universe::objectArrayKlassObj(); // already relocated to point to archived klass
 573   HeapWord* mem = G1CollectedHeap::heap()->archive_mem_allocate(size);
 574 
 575   memset(mem, 0, size * BytesPerWord);
 576   {
 577     // This is copied from MemAllocator::finish
 578     oopDesc::set_mark(mem, k->prototype_header());
 579 #ifndef _LP64
 580     oopDesc::release_set_klass(mem, k);
 581 #endif
 582   }
 583   {
 584     // This is copied from ObjArrayAllocator::initialize
 585     arrayOopDesc::set_length(mem, length);
 586   }
 587 
 588   _roots = OopHandle(Universe::vm_global(), cast_to_oop(mem));
 589   for (int i = 0; i < length; i++) {
 590     roots()->obj_at_put(i, _pending_roots->at(i));
 591   }
 592   log_info(cds)("archived obj roots[%d] = " SIZE_FORMAT " words, klass = %p, obj = %p", length, size, k, mem);
 593 }
 594 
 595 void HeapShared::init_narrow_oop_decoding(address base, int shift) {
 596   _narrow_oop_base = base;
 597   _narrow_oop_shift = shift;
 598 }
 599 
 600 //
 601 // Subgraph archiving support
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