diff --git a/src/method_reference.h b/src/method_reference.h
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+++ b/src/method_reference.h
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+/*
+ * Copyright (C) 2013 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_SRC_METHOD_REFERENCE_H_
+#define ART_SRC_METHOD_REFERENCE_H_
+
+namespace art {
+
+class DexFile;
+
+// A class is uniquely located by its DexFile and the class_defs_ table index into that DexFile
+typedef std::pair<const DexFile*, uint32_t> ClassReference;
+
+// A method is uniquely located by its DexFile and the method_ids_ table index into that DexFile
+struct MethodReference {
+  MethodReference(const DexFile* file, uint32_t index) : dex_file(file), dex_method_index(index) {
+  }
+  const DexFile* dex_file;
+  uint32_t dex_method_index;
+};
+
+struct MethodReferenceComparator {
+  bool operator()(MethodReference mr1, MethodReference mr2) const {
+    if (mr1.dex_file == mr2.dex_file) {
+      return mr1.dex_method_index < mr2.dex_method_index;
+    } else {
+      return mr1.dex_file < mr2.dex_file;
+    }
+  }
+};
+
+}  // namespace art
+
+#endif  // ART_SRC_METHOD_REFERENCE_H_