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diff --git a/runtime/class_root-inl.h b/runtime/class_root-inl.h
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+/*
+ * Copyright (C) 2018 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_CLASS_ROOT_INL_H_
+#define ART_RUNTIME_CLASS_ROOT_INL_H_
+
+#include "class_root.h"
+
+#include "class_linker-inl.h"
+#include "mirror/class.h"
+#include "mirror/object_array-inl.h"
+#include "obj_ptr-inl.h"
+#include "runtime.h"
+
+namespace art {
+
+template <ReadBarrierOption kReadBarrierOption>
+inline ObjPtr<mirror::Class> GetClassRoot(ClassRoot class_root,
+                                          ObjPtr<mirror::ObjectArray<mirror::Class>> class_roots) {
+  DCHECK(class_roots != nullptr);
+  if (kReadBarrierOption == kWithReadBarrier) {
+    // With read barrier all references must point to the to-space.
+    // Without read barrier, this check could fail.
+    DCHECK_EQ(class_roots, Runtime::Current()->GetClassLinker()->GetClassRoots());
+  }
+  DCHECK_LT(static_cast<uint32_t>(class_root), static_cast<uint32_t>(ClassRoot::kMax));
+  int32_t index = static_cast<int32_t>(class_root);
+  ObjPtr<mirror::Class> klass =
+      class_roots->GetWithoutChecks<kDefaultVerifyFlags, kReadBarrierOption>(index);
+  DCHECK(klass != nullptr);
+  return klass;
+}
+
+template <ReadBarrierOption kReadBarrierOption>
+inline ObjPtr<mirror::Class> GetClassRoot(ClassRoot class_root, ClassLinker* linker)
+    REQUIRES_SHARED(Locks::mutator_lock_) {
+  return GetClassRoot<kReadBarrierOption>(class_root, linker->GetClassRoots<kReadBarrierOption>());
+}
+
+template <ReadBarrierOption kReadBarrierOption>
+inline ObjPtr<mirror::Class> GetClassRoot(ClassRoot class_root)
+    REQUIRES_SHARED(Locks::mutator_lock_) {
+  return GetClassRoot<kReadBarrierOption>(class_root, Runtime::Current()->GetClassLinker());
+}
+
+namespace detail {
+
+class ClassNotFoundExceptionTag;
+template <class Tag> struct NoMirrorType;
+
+template <class MirrorType>
+struct ClassRootSelector;  // No definition for unspecialized ClassRoot selector.
+
+#define SPECIALIZE_CLASS_ROOT_SELECTOR(name, descriptor, mirror_type) \
+  template <>                                                         \
+  struct ClassRootSelector<mirror_type> {                             \
+    static constexpr ClassRoot value = ClassRoot::name;               \
+  };
+
+CLASS_ROOT_LIST(SPECIALIZE_CLASS_ROOT_SELECTOR)
+
+#undef SPECIALIZE_CLASS_ROOT_SELECTOR
+
+}  // namespace detail
+
+template <class MirrorType, ReadBarrierOption kReadBarrierOption>
+inline ObjPtr<mirror::Class> GetClassRoot(ObjPtr<mirror::ObjectArray<mirror::Class>> class_roots)
+    REQUIRES_SHARED(Locks::mutator_lock_) {
+  return GetClassRoot<kReadBarrierOption>(detail::ClassRootSelector<MirrorType>::value,
+                                          class_roots);
+}
+
+template <class MirrorType, ReadBarrierOption kReadBarrierOption>
+inline ObjPtr<mirror::Class> GetClassRoot(ClassLinker* linker)
+    REQUIRES_SHARED(Locks::mutator_lock_) {
+  return GetClassRoot<kReadBarrierOption>(detail::ClassRootSelector<MirrorType>::value, linker);
+}
+
+template <class MirrorType, ReadBarrierOption kReadBarrierOption>
+inline ObjPtr<mirror::Class> GetClassRoot() REQUIRES_SHARED(Locks::mutator_lock_) {
+  return GetClassRoot<kReadBarrierOption>(detail::ClassRootSelector<MirrorType>::value);
+}
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_CLASS_ROOT_INL_H_