438 // Mark the pointer in the oopmap
439 T* region_bottom = (T*)requested_region_bottom;
440 assert(request_p >= region_bottom, "must be");
441 BitMap::idx_t idx = request_p - region_bottom;
442 assert(idx < oopmap->size(), "overflow");
443 oopmap->set_bit(idx);
444 }
445
446 void ArchiveHeapWriter::update_header_for_requested_obj(oop requested_obj, oop src_obj, Klass* src_klass) {
447 assert(UseCompressedClassPointers, "Archived heap only supported for compressed klasses");
448 narrowKlass nk = ArchiveBuilder::current()->get_requested_narrow_klass(src_klass);
449 address buffered_addr = requested_addr_to_buffered_addr(cast_from_oop<address>(requested_obj));
450
451 oop fake_oop = cast_to_oop(buffered_addr);
452 fake_oop->set_narrow_klass(nk);
453
454 // We need to retain the identity_hash, because it may have been used by some hashtables
455 // in the shared heap. This also has the side effect of pre-initializing the
456 // identity_hash for all shared objects, so they are less likely to be written
457 // into during run time, increasing the potential of memory sharing.
458 if (src_obj != nullptr) {
459 intptr_t src_hash = src_obj->identity_hash();
460 fake_oop->set_mark(markWord::prototype().copy_set_hash(src_hash));
461 assert(fake_oop->mark().is_unlocked(), "sanity");
462
463 DEBUG_ONLY(intptr_t archived_hash = fake_oop->identity_hash());
464 assert(src_hash == archived_hash, "Different hash codes: original " INTPTR_FORMAT ", archived " INTPTR_FORMAT, src_hash, archived_hash);
465 }
466 }
467
468 // Relocate an element in the buffered copy of HeapShared::roots()
469 template <typename T> void ArchiveHeapWriter::relocate_root_at(oop requested_roots, int index, CHeapBitMap* oopmap) {
470 size_t offset = (size_t)((objArrayOop)requested_roots)->obj_at_offset<T>(index);
471 relocate_field_in_buffer<T>((T*)(buffered_heap_roots_addr() + offset), oopmap);
472 }
473
474 class ArchiveHeapWriter::EmbeddedOopRelocator: public BasicOopIterateClosure {
475 oop _src_obj;
476 address _buffered_obj;
477 CHeapBitMap* _oopmap;
478
479 public:
480 EmbeddedOopRelocator(oop src_obj, address buffered_obj, CHeapBitMap* oopmap) :
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438 // Mark the pointer in the oopmap
439 T* region_bottom = (T*)requested_region_bottom;
440 assert(request_p >= region_bottom, "must be");
441 BitMap::idx_t idx = request_p - region_bottom;
442 assert(idx < oopmap->size(), "overflow");
443 oopmap->set_bit(idx);
444 }
445
446 void ArchiveHeapWriter::update_header_for_requested_obj(oop requested_obj, oop src_obj, Klass* src_klass) {
447 assert(UseCompressedClassPointers, "Archived heap only supported for compressed klasses");
448 narrowKlass nk = ArchiveBuilder::current()->get_requested_narrow_klass(src_klass);
449 address buffered_addr = requested_addr_to_buffered_addr(cast_from_oop<address>(requested_obj));
450
451 oop fake_oop = cast_to_oop(buffered_addr);
452 fake_oop->set_narrow_klass(nk);
453
454 // We need to retain the identity_hash, because it may have been used by some hashtables
455 // in the shared heap. This also has the side effect of pre-initializing the
456 // identity_hash for all shared objects, so they are less likely to be written
457 // into during run time, increasing the potential of memory sharing.
458 if (src_obj != nullptr && (!(EnableValhalla && src_obj->mark().is_inline_type()))) {
459 intptr_t src_hash = src_obj->identity_hash();
460 fake_oop->set_mark(src_klass->prototype_header().copy_set_hash(src_hash));
461 assert(fake_oop->mark().is_unlocked(), "sanity");
462
463 DEBUG_ONLY(intptr_t archived_hash = fake_oop->identity_hash());
464 assert(src_hash == archived_hash, "Different hash codes: original " INTPTR_FORMAT ", archived " INTPTR_FORMAT, src_hash, archived_hash);
465 }
466 }
467
468 // Relocate an element in the buffered copy of HeapShared::roots()
469 template <typename T> void ArchiveHeapWriter::relocate_root_at(oop requested_roots, int index, CHeapBitMap* oopmap) {
470 size_t offset = (size_t)((objArrayOop)requested_roots)->obj_at_offset<T>(index);
471 relocate_field_in_buffer<T>((T*)(buffered_heap_roots_addr() + offset), oopmap);
472 }
473
474 class ArchiveHeapWriter::EmbeddedOopRelocator: public BasicOopIterateClosure {
475 oop _src_obj;
476 address _buffered_obj;
477 CHeapBitMap* _oopmap;
478
479 public:
480 EmbeddedOopRelocator(oop src_obj, address buffered_obj, CHeapBitMap* oopmap) :
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