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src/hotspot/share/opto/runtime.cpp

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 414   // The oopFactory likes to work with the element type.
 415   BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();
 416   result = oopFactory::new_typeArray_nozero(elem_type, len, THREAD);
 417 
 418   // Pass oops back through thread local storage.  Our apparent type to Java
 419   // is that we return an oop, but we can block on exit from this routine and
 420   // a GC can trash the oop in C's return register.  The generated stub will
 421   // fetch the oop from TLS after any possible GC.
 422   deoptimize_caller_frame(current, HAS_PENDING_EXCEPTION);
 423   current->set_vm_result_oop(result);
 424   JRT_BLOCK_END;
 425 
 426 
 427   // inform GC that we won't do card marks for initializing writes.
 428   SharedRuntime::on_slowpath_allocation_exit(current);
 429 
 430   oop result = current->vm_result_oop();
 431   if ((len > 0) && (result != nullptr) &&
 432       is_deoptimized_caller_frame(current)) {
 433     // Zero array here if the caller is deoptimized.
 434     const size_t size = TypeArrayKlass::cast(array_type)->oop_size(result);
 435     BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();
 436     size_t hs_bytes = arrayOopDesc::base_offset_in_bytes(elem_type);
 437     assert(is_aligned(hs_bytes, BytesPerInt), "must be 4 byte aligned");
 438     HeapWord* obj = cast_from_oop<HeapWord*>(result);
 439     if (!is_aligned(hs_bytes, BytesPerLong)) {
 440       *reinterpret_cast<jint*>(reinterpret_cast<char*>(obj) + hs_bytes) = 0;
 441       hs_bytes += BytesPerInt;
 442     }
 443 
 444     // Optimized zeroing.
 445     assert(is_aligned(hs_bytes, BytesPerLong), "must be 8-byte aligned");
 446     const size_t aligned_hs = hs_bytes / BytesPerLong;
 447     Copy::fill_to_aligned_words(obj+aligned_hs, size-aligned_hs);
 448   }
 449 
 450 JRT_END
 451 
 452 // Note: multianewarray for one dimension is handled inline by GraphKit::new_array.
 453 
 454 // multianewarray for 2 dimensions

 414   // The oopFactory likes to work with the element type.
 415   BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();
 416   result = oopFactory::new_typeArray_nozero(elem_type, len, THREAD);
 417 
 418   // Pass oops back through thread local storage.  Our apparent type to Java
 419   // is that we return an oop, but we can block on exit from this routine and
 420   // a GC can trash the oop in C's return register.  The generated stub will
 421   // fetch the oop from TLS after any possible GC.
 422   deoptimize_caller_frame(current, HAS_PENDING_EXCEPTION);
 423   current->set_vm_result_oop(result);
 424   JRT_BLOCK_END;
 425 
 426 
 427   // inform GC that we won't do card marks for initializing writes.
 428   SharedRuntime::on_slowpath_allocation_exit(current);
 429 
 430   oop result = current->vm_result_oop();
 431   if ((len > 0) && (result != nullptr) &&
 432       is_deoptimized_caller_frame(current)) {
 433     // Zero array here if the caller is deoptimized.
 434     const size_t size = TypeArrayKlass::cast(array_type)->oop_size(result, result->mark());
 435     BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();
 436     size_t hs_bytes = arrayOopDesc::base_offset_in_bytes(elem_type);
 437     assert(is_aligned(hs_bytes, BytesPerInt), "must be 4 byte aligned");
 438     HeapWord* obj = cast_from_oop<HeapWord*>(result);
 439     if (!is_aligned(hs_bytes, BytesPerLong)) {
 440       *reinterpret_cast<jint*>(reinterpret_cast<char*>(obj) + hs_bytes) = 0;
 441       hs_bytes += BytesPerInt;
 442     }
 443 
 444     // Optimized zeroing.
 445     assert(is_aligned(hs_bytes, BytesPerLong), "must be 8-byte aligned");
 446     const size_t aligned_hs = hs_bytes / BytesPerLong;
 447     Copy::fill_to_aligned_words(obj+aligned_hs, size-aligned_hs);
 448   }
 449 
 450 JRT_END
 451 
 452 // Note: multianewarray for one dimension is handled inline by GraphKit::new_array.
 453 
 454 // multianewarray for 2 dimensions
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