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diff --git a/runtime/deoptimize_stack_visitor.h b/runtime/deoptimize_stack_visitor.h
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+++ b/runtime/deoptimize_stack_visitor.h
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+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_DEOPTIMIZE_STACK_VISITOR_H_
+#define ART_RUNTIME_DEOPTIMIZE_STACK_VISITOR_H_
+
+#include "base/mutex.h"
+#include "stack.h"
+
+namespace art {
+
+namespace mirror {
+class ArtMethod;
+}  // namespace mirror
+class QuickExceptionHandler;
+class Thread;
+
+// Prepares deoptimization.
+class DeoptimizeStackVisitor FINAL : public StackVisitor {
+ public:
+  DeoptimizeStackVisitor(Thread* self, Context* context, QuickExceptionHandler* exception_handler)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
+      : StackVisitor(self, context), self_(self), exception_handler_(exception_handler),
+        prev_shadow_frame_(nullptr) {
+  }
+
+  bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+ private:
+  bool HandleDeoptimization(mirror::ArtMethod* m) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+  Thread* const self_;
+  QuickExceptionHandler* const exception_handler_;
+  ShadowFrame* prev_shadow_frame_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeoptimizeStackVisitor);
+};
+
+}  // namespace art
+#endif  // ART_RUNTIME_DEOPTIMIZE_STACK_VISITOR_H_