# HG changeset patch
# User kvn
# Date 1294806373 28800
# Node ID d4fca0a6abde2f6b8c57be1d285b6b88cb9de93e
# Parent  dd031b2226de94975880a96dd2851b78453f4ef3
7011386: race in objArrayKlass::array_klass_impl
Summary: Move _lower_dimension field initialization before _higher_dimension and add storestore barrier.
Reviewed-by: dholmes, iveresov, never

diff -r dd031b2226de -r d4fca0a6abde src/share/vm/oops/arrayKlass.hpp
--- a/src/share/vm/oops/arrayKlass.hpp	Mon Jan 10 18:46:29 2011 -0800
+++ b/src/share/vm/oops/arrayKlass.hpp	Tue Jan 11 20:26:13 2011 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -36,8 +36,8 @@
   friend class VMStructs;
  private:
   int      _dimension;         // This is n'th-dimensional array.
-  klassOop _higher_dimension;  // Refers the (n+1)'th-dimensional array (if present).
-  klassOop _lower_dimension;   // Refers the (n-1)'th-dimensional array (if present).
+  volatile klassOop _higher_dimension;  // Refers the (n+1)'th-dimensional array (if present).
+  volatile klassOop _lower_dimension;   // Refers the (n-1)'th-dimensional array (if present).
   int      _vtable_len;        // size of vtable for this klass
   juint    _alloc_size;        // allocation profiling support
   oop      _component_mirror;  // component type, as a java/lang/Class
diff -r dd031b2226de -r d4fca0a6abde src/share/vm/oops/objArrayKlass.cpp
--- a/src/share/vm/oops/objArrayKlass.cpp	Mon Jan 10 18:46:29 2011 -0800
+++ b/src/share/vm/oops/objArrayKlass.cpp	Tue Jan 11 20:26:13 2011 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -235,8 +235,9 @@
           objArrayKlassKlass::cast(Universe::objArrayKlassKlassObj())->
           allocate_objArray_klass(dimension + 1, this_oop, CHECK_NULL);
         ak = objArrayKlassHandle(THREAD, new_klass);
+        ak->set_lower_dimension(this_oop());
+        OrderAccess::storestore();
         this_oop->set_higher_dimension(ak());
-        ak->set_lower_dimension(this_oop());
         assert(ak->oop_is_objArray(), "incorrect initialization of objArrayKlass");
       }
     }
diff -r dd031b2226de -r d4fca0a6abde src/share/vm/oops/typeArrayKlass.cpp
--- a/src/share/vm/oops/typeArrayKlass.cpp	Mon Jan 10 18:46:29 2011 -0800
+++ b/src/share/vm/oops/typeArrayKlass.cpp	Tue Jan 11 20:26:13 2011 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -179,6 +179,7 @@
           dimension + 1, h_this, CHECK_NULL);
         h_ak = objArrayKlassHandle(THREAD, oak);
         h_ak->set_lower_dimension(h_this());
+        OrderAccess::storestore();
         h_this->set_higher_dimension(h_ak());
         assert(h_ak->oop_is_objArray(), "incorrect initialization of objArrayKlass");
       }
diff -r dd031b2226de -r d4fca0a6abde src/share/vm/runtime/vmStructs.cpp
--- a/src/share/vm/runtime/vmStructs.cpp	Mon Jan 10 18:46:29 2011 -0800
+++ b/src/share/vm/runtime/vmStructs.cpp	Tue Jan 11 20:26:13 2011 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2011, 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
@@ -219,8 +219,8 @@
   volatile_nonstatic_field(oopDesc,            _metadata._compressed_klass,                   narrowOop)                             \
      static_field(oopDesc,                     _bs,                                           BarrierSet*)                           \
   nonstatic_field(arrayKlass,                  _dimension,                                    int)                                   \
-  nonstatic_field(arrayKlass,                  _higher_dimension,                             klassOop)                              \
-  nonstatic_field(arrayKlass,                  _lower_dimension,                              klassOop)                              \
+  volatile_nonstatic_field(arrayKlass,         _higher_dimension,                             klassOop)                              \
+  volatile_nonstatic_field(arrayKlass,         _lower_dimension,                              klassOop)                              \
   nonstatic_field(arrayKlass,                  _vtable_len,                                   int)                                   \
   nonstatic_field(arrayKlass,                  _alloc_size,                                   juint)                                 \
   nonstatic_field(arrayKlass,                  _component_mirror,                             oop)                                   \