src/cpu/arm/vm/sharedRuntime_arm.cpp

rev 12692 : 8176100: [REDO][REDO] G1 Needs pre barrier on dereference of weak JNI handles
Reviewed-by:

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -1730,33 +1730,27 @@
   case T_LONG   : // fall through
   case T_VOID   : // fall through
   case T_FLOAT  : // fall through
   case T_DOUBLE : /* nothing to do */          break;
   case T_OBJECT : // fall through
-  case T_ARRAY  : {
-    Label L;
-    __ cbz(R0, L);
-    __ ldr(R0, Address(R0));
-    __ verify_oop(R0);
-    __ bind(L);
-    break;
-  }
+  case T_ARRAY  : break; // See JNIHandles::resolve below
   default:
     ShouldNotReachHere();
   }
 #else
   __ str_32(Rtemp, Address(LR, JNIHandleBlock::top_offset_in_bytes()));
   if (CheckJNICalls) {
     __ str(__ zero_register(Rtemp), Address(Rthread, JavaThread::pending_jni_exception_check_fn_offset()));
   }
+#endif // AARCH64
 
-  // Unhandle the result
+  // Unbox oop result, e.g. JNIHandles::resolve value in R0.
   if (ret_type == T_OBJECT || ret_type == T_ARRAY) {
-    __ cmp(R0, 0);
-    __ ldr(R0, Address(R0), ne);
+    __ resolve_jobject(R0,      // value
+                       Rtemp,   // tmp1
+                       R1_tmp); // tmp2
   }
-#endif // AARCH64
 
   // Any exception pending?
   __ ldr(Rtemp, Address(Rthread, Thread::pending_exception_offset()));
   __ mov(SP, FP);