diff -r 000000000000 -r f90c822e73f8 src/share/vm/prims/whitebox.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/prims/whitebox.hpp	Wed Apr 27 01:25:04 2016 +0800
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2012, 2014, 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_VM_PRIMS_WHITEBOX_HPP
+#define SHARE_VM_PRIMS_WHITEBOX_HPP
+
+#include "prims/jni.h"
+
+#include "memory/allocation.hpp"
+#include "oops/oopsHierarchy.hpp"
+
+// Entry macro to transition from JNI to VM state.
+
+#define WB_ENTRY(result_type, header) JNI_ENTRY(result_type, header)
+#define WB_END JNI_END
+#define WB_METHOD_DECLARE(result_type) extern "C" result_type JNICALL
+
+#define CHECK_JNI_EXCEPTION_(env, value)                               \
+  do {                                                                 \
+    JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
+    if (HAS_PENDING_EXCEPTION) {                                       \
+      return(value);                                                   \
+    }                                                                  \
+  } while (0)
+
+#define CHECK_JNI_EXCEPTION(env)                                       \
+  do {                                                                 \
+    JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
+    if (HAS_PENDING_EXCEPTION) {                                       \
+      return;                                                          \
+    }                                                                  \
+  } while (0)
+
+class WhiteBox : public AllStatic {
+ private:
+  static bool _used;
+ public:
+  static bool used()     { return _used; }
+  static void set_used() { _used = true; }
+  static int offset_for_field(const char* field_name, oop object,
+    Symbol* signature_symbol);
+  static const char* lookup_jstring(const char* field_name, oop object);
+  static bool lookup_bool(const char* field_name, oop object);
+};
+
+
+
+#endif // SHARE_VM_PRIMS_WHITEBOX_HPP