--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/jni/jfrJavaSupport.hpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2016, 2018, 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_JFR_JNI_JFRJAVASUPPORT_HPP
+#define SHARE_VM_JFR_JNI_JFRJAVASUPPORT_HPP
+
+#include "jfr/jni/jfrJavaCall.hpp"
+#include "utilities/exceptions.hpp"
+
+class Klass;
+class JavaThread;
+class outputStream;
+
+class JfrJavaSupport : public AllStatic {
+ public:
+  static jobject local_jni_handle(const oop obj, Thread* t);
+  static jobject local_jni_handle(const jobject handle, Thread* t);
+  static void destroy_local_jni_handle(const jobject handle);
+
+  static jobject global_jni_handle(const oop obj, Thread* t);
+  static jobject global_jni_handle(const jobject handle, Thread* t);
+  static void destroy_global_jni_handle(const jobject handle);
+
+  static oop resolve_non_null(jobject obj);
+  static void notify_all(jobject obj, TRAPS);
+  static void set_array_element(jobjectArray arr, jobject element, int index, Thread* t);
+
+  // naked oop result
+  static void call_static(JfrJavaArguments* args, TRAPS);
+  static void call_special(JfrJavaArguments* args, TRAPS);
+  static void call_virtual(JfrJavaArguments* args, TRAPS);
+
+  static void set_field(JfrJavaArguments* args, TRAPS);
+  static void get_field(JfrJavaArguments* args, TRAPS);
+  static void new_object(JfrJavaArguments* args, TRAPS);
+
+  // global jni handle result
+  static void new_object_global_ref(JfrJavaArguments* args, TRAPS);
+  static void get_field_global_ref(JfrJavaArguments* args, TRAPS);
+
+  // local jni handle result
+  static void new_object_local_ref(JfrJavaArguments* args, TRAPS);
+  static void get_field_local_ref(JfrJavaArguments* args, TRAPS);
+
+  static jstring new_string(const char* c_str, TRAPS);
+  static jobjectArray new_string_array(int length, TRAPS);
+
+  static jobject new_java_lang_Boolean(bool value, TRAPS);
+  static jobject new_java_lang_Integer(jint value, TRAPS);
+  static jobject new_java_lang_Long(jlong value, TRAPS);
+
+  // misc
+  static Klass* klass(const jobject handle);
+  // caller needs ResourceMark
+  static const char* c_str(jstring string, Thread* jt);
+
+  // exceptions
+  static void throw_illegal_state_exception(const char* message, TRAPS);
+  static void throw_illegal_argument_exception(const char* message, TRAPS);
+  static void throw_internal_error(const char* message, TRAPS);
+  static void throw_out_of_memory_error(const char* message, TRAPS);
+  static void throw_class_format_error(const char* message, TRAPS);
+
+  static bool is_jdk_jfr_module_available();
+  static bool is_jdk_jfr_module_available(outputStream* stream, TRAPS);
+
+  static jlong jfr_thread_id(jobject target_thread);
+
+  // critical
+  static void abort(jstring errorMsg, TRAPS);
+  static void uncaught_exception(jthrowable throwable, Thread* t);
+
+  // asserts
+  DEBUG_ONLY(static void check_java_thread_in_vm(Thread* t);)
+  DEBUG_ONLY(static void check_java_thread_in_native(Thread* t);)
+
+  enum CAUSE {
+    VM_ERROR,
+    OUT_OF_MEMORY,
+    STACK_OVERFLOW,
+    RUNTIME_EXCEPTION,
+    UNKNOWN,
+    NOF_CAUSES
+  };
+
+  static CAUSE cause();
+
+ private:
+  static CAUSE _cause;
+  static void set_cause(jthrowable throwable, Thread* t);
+};
+
+#endif // SHARE_VM_JFR_JNI_JFRJAVASUPPORT_HPP