diff --git a/runtime/length_prefixed_array.h b/runtime/length_prefixed_array.h
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+++ b/runtime/length_prefixed_array.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_LENGTH_PREFIXED_ARRAY_H_
+#define ART_RUNTIME_LENGTH_PREFIXED_ARRAY_H_
+
+#include <stddef.h>  // for offsetof()
+
+#include "linear_alloc.h"
+#include "stride_iterator.h"
+#include "base/iteration_range.h"
+
+namespace art {
+
+template<typename T>
+class LengthPrefixedArray {
+ public:
+  explicit LengthPrefixedArray(uint64_t length) : length_(length) {}
+
+  T& At(size_t index, size_t element_size = sizeof(T)) {
+    DCHECK_LT(index, length_);
+    return *reinterpret_cast<T*>(&data_[0] + index * element_size);
+  }
+
+  StrideIterator<T> Begin(size_t element_size = sizeof(T)) {
+    return StrideIterator<T>(reinterpret_cast<T*>(&data_[0]), element_size);
+  }
+
+  StrideIterator<T> End(size_t element_size = sizeof(T)) {
+    return StrideIterator<T>(reinterpret_cast<T*>(&data_[0] + element_size * length_),
+                             element_size);
+  }
+
+  static size_t OffsetOfElement(size_t index, size_t element_size = sizeof(T)) {
+    return offsetof(LengthPrefixedArray<T>, data_) + index * element_size;
+  }
+
+  static size_t ComputeSize(size_t num_elements, size_t element_size = sizeof(T)) {
+    return sizeof(LengthPrefixedArray<T>) + num_elements * element_size;
+  }
+
+  uint64_t Length() const {
+    return length_;
+  }
+
+ private:
+  uint64_t length_;  // 64 bits for padding reasons.
+  uint8_t data_[0];
+};
+
+// Returns empty iteration range if the array is null.
+template<typename T>
+IterationRange<StrideIterator<T>> MakeIterationRangeFromLengthPrefixedArray(
+    LengthPrefixedArray<T>* arr, size_t element_size) {
+  return arr != nullptr ?
+      MakeIterationRange(arr->Begin(element_size), arr->End(element_size)) :
+      MakeEmptyIterationRange(StrideIterator<T>(nullptr, 0));
+}
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_LENGTH_PREFIXED_ARRAY_H_