--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/metaprogramming/isArray.hpp	Wed Mar 13 11:31:00 2019 +0100
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2019, 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_METAPROGRAMMING_ISARRAY_HPP
+#define SHARE_METAPROGRAMMING_ISARRAY_HPP
+
+#include "metaprogramming/integralConstant.hpp"
+
+template <typename T> struct IsArray: public FalseType {};
+
+template <typename T> struct IsArray<T[]>: public TrueType {};
+template <typename T, size_t S> struct IsArray<T[S]>: public TrueType {};
+
+#endif // SHARE_METAPROGRAMMING_ISARRAY_HPP

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/metaprogramming/removeExtent.hpp	Wed Mar 13 11:31:00 2019 +0100
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2019, 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_METAPROGRAMMING_REMOVEEXTENT_HPP
+#define SHARE_METAPROGRAMMING_REMOVEEXTENT_HPP
+
+#include "memory/allocation.hpp"
+
+template <typename T> struct RemoveExtent: AllStatic { typedef T type; };
+
+template <typename T> struct RemoveExtent<T[]>: AllStatic { typedef T type; };
+template <typename T, size_t S> struct RemoveExtent<T[S]>: AllStatic { typedef T type; };
+
+#endif // SHARE_METAPROGRAMMING_REMOVEEXTENT_HPP

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/gtest/metaprogramming/test_isArray.cpp	Wed Mar 13 11:31:00 2019 +0100
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2019, 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "memory/allocation.hpp"
+#include "metaprogramming/isArray.hpp"
+#include "utilities/debug.hpp"
+
+class IsArrayTest: AllStatic {
+  class A: AllStatic {};
+
+  static const bool ia_A = IsArray<A>::value;
+  STATIC_ASSERT(!ia_A);
+
+  static const bool ia_Aptr = IsArray<A*>::value;
+  STATIC_ASSERT(!ia_Aptr);
+
+  static const bool ia_Aarr = IsArray<A[]>::value;
+  STATIC_ASSERT(ia_Aarr);
+
+  static const bool ia_Aarr10 = IsArray<A[10]>::value;
+  STATIC_ASSERT(ia_Aarr10);
+
+  static const bool ia_Aptrarr10 = IsArray<A*[10]>::value;
+  STATIC_ASSERT(ia_Aptrarr10);
+
+  static const bool ia_Aarr10arr10 = IsArray<A[10][10]>::value;
+  STATIC_ASSERT(ia_Aarr10arr10);
+
+  static const bool ia_cAarr = IsArray<const A[]>::value;
+  STATIC_ASSERT(ia_cAarr);
+
+  static const bool ia_vAarr = IsArray<volatile A[]>::value;
+  STATIC_ASSERT(ia_vAarr);
+
+  static const bool ia_cAarr10 = IsArray<const A[10]>::value;
+  STATIC_ASSERT(ia_cAarr10);
+
+  static const bool ia_vAarr10 = IsArray<volatile A[10]>::value;
+  STATIC_ASSERT(ia_vAarr10);
+
+  static const bool ia_voidptr = IsArray<void*>::value;
+  STATIC_ASSERT(!ia_voidptr);
+
+  static const bool ia_intptrt = IsArray<intptr_t>::value;
+  STATIC_ASSERT(!ia_intptrt);
+
+  static const bool ia_char = IsArray<char>::value;
+  STATIC_ASSERT(!ia_char);
+};

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/gtest/metaprogramming/test_removeExtent.cpp	Wed Mar 13 11:31:00 2019 +0100
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2019, 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "memory/allocation.hpp"
+#include "metaprogramming/removeExtent.hpp"
+#include "metaprogramming/isSame.hpp"
+#include "utilities/debug.hpp"
+
+class RemoveExtentTest {
+  class A: AllStatic {};
+
+  typedef A* Aptr;
+  typedef A Aarr[];
+  typedef A Aarr10[10];
+  typedef const A cA;
+  typedef const A* cAptr;
+  typedef const A cAarr[];
+  typedef const A cAarr10[10];
+
+  typedef RemoveExtent<Aptr>::type ra_Aptr;
+  static const bool ra_Aptr_is_Aptr = IsSame<ra_Aptr, Aptr>::value;
+  STATIC_ASSERT(ra_Aptr_is_Aptr);
+
+  typedef RemoveExtent<Aarr>::type ra_Aarr;
+  static const bool ra_Aarr_is_A = IsSame<ra_Aarr, A>::value;
+  STATIC_ASSERT(ra_Aarr_is_A);
+
+  typedef RemoveExtent<Aarr10>::type ra_Aarr10;
+  static const bool ra_Aarr10_is_A = IsSame<ra_Aarr10, A>::value;
+  STATIC_ASSERT(ra_Aarr10_is_A);
+
+  typedef RemoveExtent<cAptr>::type ra_cAptr;
+  static const bool ra_cAptr_is_cAptr = IsSame<ra_cAptr, cAptr>::value;
+  STATIC_ASSERT(ra_cAptr_is_cAptr);
+
+  typedef RemoveExtent<cAarr>::type ra_cAarr;
+  static const bool ra_cAarr_is_cA = IsSame<ra_cAarr, cA>::value;
+  STATIC_ASSERT(ra_cAarr_is_cA);
+
+  typedef RemoveExtent<cAarr10>::type ra_cAarr10;
+  static const bool ra_cAarr10_is_cA = IsSame<ra_cAarr10, cA>::value;
+  STATIC_ASSERT(ra_cAarr10_is_cA);
+};