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diff --git a/runtime/runtime_options.h b/runtime/runtime_options.h
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+/*
+ * Copyright (C) 2015 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_RUNTIME_OPTIONS_H_
+#define ART_RUNTIME_RUNTIME_OPTIONS_H_
+
+#include "runtime/base/variant_map.h"
+#include "cmdline/cmdline_types.h"  // TODO: don't need to include this file here
+
+// Map keys
+#include <vector>
+#include <string>
+#include "runtime/base/logging.h"
+#include "cmdline/unit.h"
+#include "jdwp/jdwp.h"
+#include "gc/collector_type.h"
+#include "gc/space/large_object_space.h"
+#include "profiler_options.h"
+#include "arch/instruction_set.h"
+#include <stdio.h>
+#include <stdarg.h>
+
+namespace art {
+
+class CompilerCallbacks;
+class DexFile;
+struct XGcOption;
+struct BackgroundGcOption;
+struct TestProfilerOptions;
+
+#define DECLARE_KEY(Type, Name) static const Key<Type> Name
+
+  // Define a key that is usable with a RuntimeArgumentMap.
+  // This key will *not* work with other subtypes of VariantMap.
+  template <typename TValue>
+  struct RuntimeArgumentMapKey : VariantMapKey<TValue> {
+    RuntimeArgumentMapKey() {}
+    explicit RuntimeArgumentMapKey(TValue default_value)
+      : VariantMapKey<TValue>(std::move(default_value)) {}
+    // Don't ODR-use constexpr default values, which means that Struct::Fields
+    // that are declared 'static constexpr T Name = Value' don't need to have a matching definition.
+  };
+
+  // Defines a type-safe heterogeneous key->value map.
+  // Use the VariantMap interface to look up or to store a RuntimeArgumentMapKey,Value pair.
+  //
+  // Example:
+  //    auto map = RuntimeArgumentMap();
+  //    map.Set(RuntimeArgumentMap::HeapTargetUtilization, 5.0);
+  //    double *target_utilization = map.Get(RuntimeArgumentMap);
+  //
+  struct RuntimeArgumentMap : VariantMap<RuntimeArgumentMap, RuntimeArgumentMapKey> {
+    // This 'using' line is necessary to inherit the variadic constructor.
+    using VariantMap<RuntimeArgumentMap, RuntimeArgumentMapKey>::VariantMap;
+
+    // Make the next many usages of Key slightly shorter to type.
+    template <typename TValue>
+    using Key = RuntimeArgumentMapKey<TValue>;
+
+    // List of key declarations, shorthand for 'static const Key<T> Name'
+#define RUNTIME_OPTIONS_KEY(Type, Name, ...) static const Key<Type> Name;
+#include "runtime_options.def"
+  };
+
+#undef DECLARE_KEY
+
+  // using RuntimeOptions = RuntimeArgumentMap;
+}  // namespace art
+
+#endif  // ART_RUNTIME_RUNTIME_OPTIONS_H_