src/cpu/aarch64/vm/c1_Runtime1_aarch64.cpp

rev 12409 : 8169177: aarch64: SIGSEGV when "-XX:+ZeroTLAB" is specified along with GC options
Summary: Add zero-initialization to C1 for fast TLAB refills
Reviewed-by: aph, drwhite
Contributed-by: kavitha.natarajan@linaro.org

*** 726,736 ****
            // get the instance size (size is postive so movl is fine for 64bit)
            __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
  
            __ tlab_allocate(obj, obj_size, 0, t1, t2, slow_path);
  
!           __ initialize_object(obj, klass, obj_size, 0, t1, t2);
            __ verify_oop(obj);
            __ ldp(r5, r19, Address(__ post(sp, 2 * wordSize)));
            __ ret(lr);
  
            __ bind(try_eden);
--- 726,736 ----
            // get the instance size (size is postive so movl is fine for 64bit)
            __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
  
            __ tlab_allocate(obj, obj_size, 0, t1, t2, slow_path);
  
!           __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ true);
            __ verify_oop(obj);
            __ ldp(r5, r19, Address(__ post(sp, 2 * wordSize)));
            __ ret(lr);
  
            __ bind(try_eden);
*** 738,748 ****
            __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
  
            __ eden_allocate(obj, obj_size, 0, t1, slow_path);
            __ incr_allocated_bytes(rthread, obj_size, 0, rscratch1);
  
!           __ initialize_object(obj, klass, obj_size, 0, t1, t2);
            __ verify_oop(obj);
            __ ldp(r5, r19, Address(__ post(sp, 2 * wordSize)));
            __ ret(lr);
  
            __ bind(slow_path);
--- 738,748 ----
            __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
  
            __ eden_allocate(obj, obj_size, 0, t1, slow_path);
            __ incr_allocated_bytes(rthread, obj_size, 0, rscratch1);
  
!           __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
            __ verify_oop(obj);
            __ ldp(r5, r19, Address(__ post(sp, 2 * wordSize)));
            __ ret(lr);
  
            __ bind(slow_path);
*** 851,861 ****
--- 851,863 ----
            assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
            assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise");
            __ andr(t1, t1, Klass::_lh_header_size_mask);
            __ sub(arr_size, arr_size, t1);  // body length
            __ add(t1, t1, obj);       // body start
+           if (!ZeroTLAB) {
             __ initialize_body(t1, arr_size, 0, t2);
+           }
            __ verify_oop(obj);
  
            __ ret(lr);
  
            __ bind(try_eden);