< prev index next >

src/hotspot/share/cds/archiveHeapWriter.cpp

Print this page

 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "cds/aotReferenceObjSupport.hpp"
 26 #include "cds/archiveHeapWriter.hpp"
 27 #include "cds/cdsConfig.hpp"
 28 #include "cds/filemap.hpp"
 29 #include "cds/heapShared.hpp"

 30 #include "classfile/javaClasses.hpp"
 31 #include "classfile/modules.hpp"
 32 #include "classfile/systemDictionary.hpp"
 33 #include "gc/shared/collectedHeap.hpp"
 34 #include "memory/iterator.inline.hpp"
 35 #include "memory/oopFactory.hpp"
 36 #include "memory/universe.hpp"
 37 #include "oops/compressedOops.hpp"
 38 #include "oops/objArrayOop.inline.hpp"
 39 #include "oops/oop.inline.hpp"
 40 #include "oops/oopHandle.inline.hpp"
 41 #include "oops/typeArrayKlass.hpp"
 42 #include "oops/typeArrayOop.hpp"
 43 #include "runtime/java.hpp"
 44 #include "runtime/mutexLocker.hpp"
 45 #include "utilities/bitMap.inline.hpp"
 46 #if INCLUDE_G1GC
 47 #include "gc/g1/g1CollectedHeap.hpp"
 48 #include "gc/g1/g1HeapRegion.hpp"
 49 #endif
 50 
 51 #if INCLUDE_CDS_JAVA_HEAP
 52 
 53 GrowableArrayCHeap<u1, mtClassShared>* ArchiveHeapWriter::_buffer = nullptr;
 54 
 55 // The following are offsets from buffer_bottom()
 56 size_t ArchiveHeapWriter::_buffer_used;
 57 
 58 // Heap root segments
 59 HeapRootSegments ArchiveHeapWriter::_heap_root_segments;
 60 
 61 address ArchiveHeapWriter::_requested_bottom;
 62 address ArchiveHeapWriter::_requested_top;
 63 





 64 GrowableArrayCHeap<ArchiveHeapWriter::NativePointerInfo, mtClassShared>* ArchiveHeapWriter::_native_pointers;
 65 GrowableArrayCHeap<oop, mtClassShared>* ArchiveHeapWriter::_source_objs;
 66 GrowableArrayCHeap<ArchiveHeapWriter::HeapObjOrder, mtClassShared>* ArchiveHeapWriter::_source_objs_order;
 67 
 68 ArchiveHeapWriter::BufferOffsetToSourceObjectTable*
 69   ArchiveHeapWriter::_buffer_offset_to_source_obj_table = nullptr;
 70 
 71 
 72 typedef ResourceHashtable<
 73       size_t,    // offset of a filler from ArchiveHeapWriter::buffer_bottom()
 74       size_t,    // size of this filler (in bytes)
 75       127,       // prime number
 76       AnyObj::C_HEAP,
 77       mtClassShared> FillersTable;
 78 static FillersTable* _fillers;
 79 static int _num_native_ptrs = 0;
 80 
 81 void ArchiveHeapWriter::init() {
 82   if (CDSConfig::is_dumping_heap()) {
 83     Universe::heap()->collect(GCCause::_java_lang_system_gc);

304     _source_objs_order->append(os);
305   }
306   log_info(cds)("computed ranks");
307   _source_objs_order->sort(compare_objs_by_oop_fields);
308   log_info(cds)("sorting heap objects done");
309 }
310 
311 void ArchiveHeapWriter::copy_source_objs_to_buffer(GrowableArrayCHeap<oop, mtClassShared>* roots) {
312   // There could be multiple root segments, which we want to be aligned by region.
313   // Putting them ahead of objects makes sure we waste no space.
314   copy_roots_to_buffer(roots);
315 
316   sort_source_objs();
317   for (int i = 0; i < _source_objs_order->length(); i++) {
318     int src_obj_index = _source_objs_order->at(i)._index;
319     oop src_obj = _source_objs->at(src_obj_index);
320     HeapShared::CachedOopInfo* info = HeapShared::archived_object_cache()->get(src_obj);
321     assert(info != nullptr, "must be");
322     size_t buffer_offset = copy_one_source_obj_to_buffer(src_obj);
323     info->set_buffer_offset(buffer_offset);


324 
325     _buffer_offset_to_source_obj_table->put_when_absent(buffer_offset, src_obj);
326     _buffer_offset_to_source_obj_table->maybe_grow();
327 
328     if (java_lang_Module::is_instance(src_obj)) {
329       Modules::check_archived_module_oop(src_obj);
330     }
331   }
332 
333   log_info(cds)("Size of heap region = %zu bytes, %d objects, %d roots, %d native ptrs",
334                 _buffer_used, _source_objs->length() + 1, roots->length(), _num_native_ptrs);



335 }
336 
337 size_t ArchiveHeapWriter::filler_array_byte_size(int length) {
338   size_t byte_size = objArrayOopDesc::object_size(length) * HeapWordSize;
339   return byte_size;
340 }
341 
342 int ArchiveHeapWriter::filler_array_length(size_t fill_bytes) {
343   assert(is_object_aligned(fill_bytes), "must be");
344   size_t elemSize = (UseCompressedOops ? sizeof(narrowOop) : sizeof(oop));
345 
346   int initial_length = to_array_length(fill_bytes / elemSize);
347   for (int length = initial_length; length >= 0; length --) {
348     size_t array_byte_size = filler_array_byte_size(length);
349     if (array_byte_size == fill_bytes) {
350       return length;
351     }
352   }
353 
354   ShouldNotReachHere();

403     _fillers->put(buffered_address_to_offset((address)filler), fill_bytes);
404   }
405 }
406 
407 size_t ArchiveHeapWriter::get_filler_size_at(address buffered_addr) {
408   size_t* p = _fillers->get(buffered_address_to_offset(buffered_addr));
409   if (p != nullptr) {
410     assert(*p > 0, "filler must be larger than zero bytes");
411     return *p;
412   } else {
413     return 0; // buffered_addr is not a filler
414   }
415 }
416 
417 template <typename T>
418 void update_buffered_object_field(address buffered_obj, int field_offset, T value) {
419   T* field_addr = cast_to_oop(buffered_obj)->field_addr<T>(field_offset);
420   *field_addr = value;
421 }
422 
















423 size_t ArchiveHeapWriter::copy_one_source_obj_to_buffer(oop src_obj) {


424   assert(!is_too_large_to_archive(src_obj), "already checked");
425   size_t byte_size = src_obj->size() * HeapWordSize;
426   assert(byte_size > 0, "no zero-size objects");
427 
428   // For region-based collectors such as G1, the archive heap may be mapped into
429   // multiple regions. We need to make sure that we don't have an object that can possible
430   // span across two regions.
431   maybe_fill_gc_region_gap(byte_size);
432 
433   size_t new_used = _buffer_used + byte_size;
434   assert(new_used > _buffer_used, "no wrap around");
435 
436   size_t cur_min_region_bottom = align_down(_buffer_used, MIN_GC_REGION_ALIGNMENT);
437   size_t next_min_region_bottom = align_down(new_used, MIN_GC_REGION_ALIGNMENT);
438   assert(cur_min_region_bottom == next_min_region_bottom, "no object should cross minimal GC region boundaries");
439 
440   ensure_buffer_space(new_used);
441 
442   address from = cast_from_oop<address>(src_obj);
443   address to = offset_to_buffered_address<address>(_buffer_used);

740     // requested_field_addr = the address of this field in the requested space
741     oop requested_obj = requested_obj_from_buffer_offset(p->buffer_offset());
742     Metadata** requested_field_addr = (Metadata**)(cast_from_oop<address>(requested_obj) + field_offset);
743     assert(bottom <= requested_field_addr && requested_field_addr < top, "range check");
744 
745     // Mark this field in the bitmap
746     BitMap::idx_t idx = requested_field_addr - bottom;
747     heap_info->ptrmap()->set_bit(idx);
748     num_non_null_ptrs ++;
749     max_idx = MAX2(max_idx, idx);
750 
751     // Set the native pointer to the requested address of the metadata (at runtime, the metadata will have
752     // this address if the RO/RW regions are mapped at the default location).
753 
754     Metadata** buffered_field_addr = requested_addr_to_buffered_addr(requested_field_addr);
755     Metadata* native_ptr = *buffered_field_addr;
756     guarantee(native_ptr != nullptr, "sanity");
757     guarantee(ArchiveBuilder::current()->has_been_buffered((address)native_ptr),
758               "Metadata %p should have been archived", native_ptr);
759 




760     address buffered_native_ptr = ArchiveBuilder::current()->get_buffered_addr((address)native_ptr);
761     address requested_native_ptr = ArchiveBuilder::current()->to_requested(buffered_native_ptr);
762     *buffered_field_addr = (Metadata*)requested_native_ptr;
763   }
764 
765   heap_info->ptrmap()->resize(max_idx + 1);
766   log_info(cds, heap)("calculate_ptrmap: marked %d non-null native pointers for heap region (%zu bits)",
767                       num_non_null_ptrs, size_t(heap_info->ptrmap()->size()));
768 }
769 
770 #endif // INCLUDE_CDS_JAVA_HEAP

 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "cds/aotReferenceObjSupport.hpp"
 26 #include "cds/archiveHeapWriter.hpp"
 27 #include "cds/cdsConfig.hpp"
 28 #include "cds/filemap.hpp"
 29 #include "cds/heapShared.hpp"
 30 #include "cds/regeneratedClasses.hpp"
 31 #include "classfile/javaClasses.hpp"
 32 #include "classfile/modules.hpp"
 33 #include "classfile/systemDictionary.hpp"
 34 #include "gc/shared/collectedHeap.hpp"
 35 #include "memory/iterator.inline.hpp"
 36 #include "memory/oopFactory.hpp"
 37 #include "memory/universe.hpp"
 38 #include "oops/compressedOops.hpp"
 39 #include "oops/objArrayOop.inline.hpp"
 40 #include "oops/oop.inline.hpp"
 41 #include "oops/oopHandle.inline.hpp"
 42 #include "oops/typeArrayKlass.hpp"
 43 #include "oops/typeArrayOop.hpp"
 44 #include "runtime/java.hpp"
 45 #include "runtime/mutexLocker.hpp"
 46 #include "utilities/bitMap.inline.hpp"
 47 #if INCLUDE_G1GC
 48 #include "gc/g1/g1CollectedHeap.hpp"
 49 #include "gc/g1/g1HeapRegion.hpp"
 50 #endif
 51 
 52 #if INCLUDE_CDS_JAVA_HEAP
 53 
 54 GrowableArrayCHeap<u1, mtClassShared>* ArchiveHeapWriter::_buffer = nullptr;
 55 
 56 // The following are offsets from buffer_bottom()
 57 size_t ArchiveHeapWriter::_buffer_used;
 58 
 59 // Heap root segments
 60 HeapRootSegments ArchiveHeapWriter::_heap_root_segments;
 61 
 62 address ArchiveHeapWriter::_requested_bottom;
 63 address ArchiveHeapWriter::_requested_top;
 64 
 65 static size_t _num_strings = 0;
 66 static size_t _string_bytes = 0; 
 67 static size_t _num_packages = 0;
 68 static size_t _num_protection_domains = 0;
 69 
 70 GrowableArrayCHeap<ArchiveHeapWriter::NativePointerInfo, mtClassShared>* ArchiveHeapWriter::_native_pointers;
 71 GrowableArrayCHeap<oop, mtClassShared>* ArchiveHeapWriter::_source_objs;
 72 GrowableArrayCHeap<ArchiveHeapWriter::HeapObjOrder, mtClassShared>* ArchiveHeapWriter::_source_objs_order;
 73 
 74 ArchiveHeapWriter::BufferOffsetToSourceObjectTable*
 75   ArchiveHeapWriter::_buffer_offset_to_source_obj_table = nullptr;
 76 
 77 
 78 typedef ResourceHashtable<
 79       size_t,    // offset of a filler from ArchiveHeapWriter::buffer_bottom()
 80       size_t,    // size of this filler (in bytes)
 81       127,       // prime number
 82       AnyObj::C_HEAP,
 83       mtClassShared> FillersTable;
 84 static FillersTable* _fillers;
 85 static int _num_native_ptrs = 0;
 86 
 87 void ArchiveHeapWriter::init() {
 88   if (CDSConfig::is_dumping_heap()) {
 89     Universe::heap()->collect(GCCause::_java_lang_system_gc);

310     _source_objs_order->append(os);
311   }
312   log_info(cds)("computed ranks");
313   _source_objs_order->sort(compare_objs_by_oop_fields);
314   log_info(cds)("sorting heap objects done");
315 }
316 
317 void ArchiveHeapWriter::copy_source_objs_to_buffer(GrowableArrayCHeap<oop, mtClassShared>* roots) {
318   // There could be multiple root segments, which we want to be aligned by region.
319   // Putting them ahead of objects makes sure we waste no space.
320   copy_roots_to_buffer(roots);
321 
322   sort_source_objs();
323   for (int i = 0; i < _source_objs_order->length(); i++) {
324     int src_obj_index = _source_objs_order->at(i)._index;
325     oop src_obj = _source_objs->at(src_obj_index);
326     HeapShared::CachedOopInfo* info = HeapShared::archived_object_cache()->get(src_obj);
327     assert(info != nullptr, "must be");
328     size_t buffer_offset = copy_one_source_obj_to_buffer(src_obj);
329     info->set_buffer_offset(buffer_offset);
330     assert(buffer_offset <= 0x7fffffff, "sanity");
331     HeapShared::add_to_permanent_oop_table(src_obj, (int)buffer_offset);
332 
333     _buffer_offset_to_source_obj_table->put_when_absent(buffer_offset, src_obj);
334     _buffer_offset_to_source_obj_table->maybe_grow();
335 
336     if (java_lang_Module::is_instance(src_obj)) {
337       Modules::check_archived_module_oop(src_obj);
338     }
339   }
340 
341   log_info(cds)("Size of heap region = %zu bytes, %d objects, %d roots, %d native ptrs",
342                 _buffer_used, _source_objs->length() + 1, roots->length(), _num_native_ptrs);
343   log_info(cds)("   strings            = %8zu (%zu bytes)", _num_strings, _string_bytes);
344   log_info(cds)("   packages           = %8zu", _num_packages);
345   log_info(cds)("   protection domains = %8zu", _num_protection_domains);
346 }
347 
348 size_t ArchiveHeapWriter::filler_array_byte_size(int length) {
349   size_t byte_size = objArrayOopDesc::object_size(length) * HeapWordSize;
350   return byte_size;
351 }
352 
353 int ArchiveHeapWriter::filler_array_length(size_t fill_bytes) {
354   assert(is_object_aligned(fill_bytes), "must be");
355   size_t elemSize = (UseCompressedOops ? sizeof(narrowOop) : sizeof(oop));
356 
357   int initial_length = to_array_length(fill_bytes / elemSize);
358   for (int length = initial_length; length >= 0; length --) {
359     size_t array_byte_size = filler_array_byte_size(length);
360     if (array_byte_size == fill_bytes) {
361       return length;
362     }
363   }
364 
365   ShouldNotReachHere();

414     _fillers->put(buffered_address_to_offset((address)filler), fill_bytes);
415   }
416 }
417 
418 size_t ArchiveHeapWriter::get_filler_size_at(address buffered_addr) {
419   size_t* p = _fillers->get(buffered_address_to_offset(buffered_addr));
420   if (p != nullptr) {
421     assert(*p > 0, "filler must be larger than zero bytes");
422     return *p;
423   } else {
424     return 0; // buffered_addr is not a filler
425   }
426 }
427 
428 template <typename T>
429 void update_buffered_object_field(address buffered_obj, int field_offset, T value) {
430   T* field_addr = cast_to_oop(buffered_obj)->field_addr<T>(field_offset);
431   *field_addr = value;
432 }
433 
434 void ArchiveHeapWriter::update_stats(oop src_obj) {
435   if (java_lang_String::is_instance(src_obj)) {
436     _num_strings ++;
437     _string_bytes += src_obj->size() * HeapWordSize;
438     _string_bytes += java_lang_String::value(src_obj)->size() * HeapWordSize;
439   } else {
440     Klass* k = src_obj->klass();
441     Symbol* name = k->name();
442     if (name->equals("java/lang/NamedPackage") || name->equals("java/lang/Package")) {
443       _num_packages ++;
444     } else if (name->equals("java/security/ProtectionDomain")) {
445       _num_protection_domains ++;
446     }
447   }
448 }
449 
450 size_t ArchiveHeapWriter::copy_one_source_obj_to_buffer(oop src_obj) {
451   update_stats(src_obj);
452 
453   assert(!is_too_large_to_archive(src_obj), "already checked");
454   size_t byte_size = src_obj->size() * HeapWordSize;
455   assert(byte_size > 0, "no zero-size objects");
456 
457   // For region-based collectors such as G1, the archive heap may be mapped into
458   // multiple regions. We need to make sure that we don't have an object that can possible
459   // span across two regions.
460   maybe_fill_gc_region_gap(byte_size);
461 
462   size_t new_used = _buffer_used + byte_size;
463   assert(new_used > _buffer_used, "no wrap around");
464 
465   size_t cur_min_region_bottom = align_down(_buffer_used, MIN_GC_REGION_ALIGNMENT);
466   size_t next_min_region_bottom = align_down(new_used, MIN_GC_REGION_ALIGNMENT);
467   assert(cur_min_region_bottom == next_min_region_bottom, "no object should cross minimal GC region boundaries");
468 
469   ensure_buffer_space(new_used);
470 
471   address from = cast_from_oop<address>(src_obj);
472   address to = offset_to_buffered_address<address>(_buffer_used);

769     // requested_field_addr = the address of this field in the requested space
770     oop requested_obj = requested_obj_from_buffer_offset(p->buffer_offset());
771     Metadata** requested_field_addr = (Metadata**)(cast_from_oop<address>(requested_obj) + field_offset);
772     assert(bottom <= requested_field_addr && requested_field_addr < top, "range check");
773 
774     // Mark this field in the bitmap
775     BitMap::idx_t idx = requested_field_addr - bottom;
776     heap_info->ptrmap()->set_bit(idx);
777     num_non_null_ptrs ++;
778     max_idx = MAX2(max_idx, idx);
779 
780     // Set the native pointer to the requested address of the metadata (at runtime, the metadata will have
781     // this address if the RO/RW regions are mapped at the default location).
782 
783     Metadata** buffered_field_addr = requested_addr_to_buffered_addr(requested_field_addr);
784     Metadata* native_ptr = *buffered_field_addr;
785     guarantee(native_ptr != nullptr, "sanity");
786     guarantee(ArchiveBuilder::current()->has_been_buffered((address)native_ptr),
787               "Metadata %p should have been archived", native_ptr);
788 
789     if (RegeneratedClasses::has_been_regenerated((address)native_ptr)) {
790       native_ptr = (Metadata*)RegeneratedClasses::get_regenerated_object((address)native_ptr);
791     }
792 
793     address buffered_native_ptr = ArchiveBuilder::current()->get_buffered_addr((address)native_ptr);
794     address requested_native_ptr = ArchiveBuilder::current()->to_requested(buffered_native_ptr);
795     *buffered_field_addr = (Metadata*)requested_native_ptr;
796   }
797 
798   heap_info->ptrmap()->resize(max_idx + 1);
799   log_info(cds, heap)("calculate_ptrmap: marked %d non-null native pointers for heap region (%zu bits)",
800                       num_non_null_ptrs, size_t(heap_info->ptrmap()->size()));
801 }
802 
803 #endif // INCLUDE_CDS_JAVA_HEAP
< prev index next >