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diff --git a/openjdkjvmti/ti_phase.h b/openjdkjvmti/ti_phase.h
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+/* Copyright (C) 2017 The Android Open Source Project
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This file implements interfaces from the file jvmti.h. This implementation
+ * is licensed under the same terms as the file jvmti.h.  The
+ * copyright and license information for the file jvmti.h follows.
+ *
+ * Copyright (c) 2003, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 ART_OPENJDKJVMTI_TI_PHASE_H_
+#define ART_OPENJDKJVMTI_TI_PHASE_H_
+
+#include "jni.h"
+#include "jvmti.h"
+
+namespace openjdkjvmti {
+
+class EventHandler;
+
+class PhaseUtil {
+ public:
+  static jvmtiError GetPhase(jvmtiEnv* env, jvmtiPhase* phase_ptr);
+  static bool IsLivePhase();
+
+  static void Register(EventHandler* event_handler);
+  static void Unregister();
+
+  // Move the phase from unitialized to LOAD.
+  static void SetToOnLoad();
+
+  // Move the phase from LOAD to PRIMORDIAL.
+  static void SetToPrimordial();
+
+  // Move the phase from unitialized to LIVE.
+  static void SetToLive();
+
+  struct PhaseCallback;
+
+  static jvmtiPhase GetPhaseUnchecked();
+
+ private:
+  static jvmtiPhase current_phase_;
+};
+
+}  // namespace openjdkjvmti
+
+#endif  // ART_OPENJDKJVMTI_TI_PHASE_H_