src/cpu/s390/vm/sharedRuntime_s390.cpp

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

@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2016 SAP SE. All rights reserved.
+ * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2017 SAP SE. 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.

@@ -2270,17 +2270,13 @@
   //--------------------------------------------------------------------
   __ verify_thread(); // Z_thread must be correct.
 
   __ reset_last_Java_frame();
 
-  // Unpack oop result
+  // Unpack oop result, e.g. JNIHandles::resolve result.
   if (ret_type == T_OBJECT || ret_type == T_ARRAY) {
-    NearLabel L;
-    __ compare64_and_branch(Z_RET, (RegisterOrConstant)0L, Assembler::bcondEqual, L);
-    __ z_lg(Z_RET, 0, Z_RET);
-    __ bind(L);
-    __ verify_oop(Z_RET);
+    __ resolve_jobject(Z_RET, /* tmp1 */ Z_R13, /* tmp2 */ Z_R7);
   }
 
   if (CheckJNICalls) {
     // clear_pending_jni_exception_check
     __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));