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src/hotspot/share/opto/runtime.cpp

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

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