diff --git a/compiler/linker/multi_oat_relative_patcher.h b/compiler/linker/multi_oat_relative_patcher.h
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+++ b/compiler/linker/multi_oat_relative_patcher.h
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+/*
+ * Copyright (C) 2016 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_COMPILER_LINKER_MULTI_OAT_RELATIVE_PATCHER_H_
+#define ART_COMPILER_LINKER_MULTI_OAT_RELATIVE_PATCHER_H_
+
+#include "arch/instruction_set.h"
+#include "method_reference.h"
+#include "relative_patcher.h"
+#include "safe_map.h"
+
+namespace art {
+
+class CompiledMethod;
+class LinkerPatch;
+class InstructionSetFeatures;
+
+namespace linker {
+
+// MultiOatRelativePatcher is a helper class for handling patching across
+// any number of oat files. It provides storage for method code offsets
+// and wraps RelativePatcher calls, adjusting relative offsets according
+// to the value set by SetAdjustment().
+class MultiOatRelativePatcher FINAL {
+ public:
+  using const_iterator =
+      SafeMap<MethodReference, uint32_t, MethodReferenceComparator>::const_iterator;
+
+  MultiOatRelativePatcher(InstructionSet instruction_set, const InstructionSetFeatures* features);
+
+  // Mark the start of a new oat file (for statistics retrieval) and set the
+  // adjustment for a new oat file to apply to all relative offsets that are
+  // passed to the MultiOatRelativePatcher.
+  //
+  // The adjustment should be the global offset of the base from which relative
+  // offsets are calculated, such as the start of .rodata for the current oat file.
+  // It must must never point directly to a method's code to avoid relative offsets
+  // with value 0 because this value is used as a missing offset indication in
+  // GetOffset() and an error indication in WriteThunks(). Additionally, it must be
+  // page-aligned, so that it does not skew alignment calculations, say arm64 ADRP.
+  void StartOatFile(uint32_t adjustment);
+
+  // Get relative offset. Returns 0 when the offset has not been set yet.
+  uint32_t GetOffset(MethodReference method_ref) {
+    auto it = method_offset_map_.map.find(method_ref);
+    return (it != method_offset_map_.map.end()) ? it->second - adjustment_ : 0u;
+  }
+
+  // Set the offset.
+  void SetOffset(MethodReference method_ref, uint32_t offset) {
+    method_offset_map_.map.Put(method_ref, offset + adjustment_);
+  }
+
+  // Wrapper around RelativePatcher::ReserveSpace(), doing offset adjustment.
+  uint32_t ReserveSpace(uint32_t offset,
+                        const CompiledMethod* compiled_method,
+                        MethodReference method_ref) {
+    offset += adjustment_;
+    offset = relative_patcher_->ReserveSpace(offset, compiled_method, method_ref);
+    offset -= adjustment_;
+    return offset;
+  }
+
+  // Wrapper around RelativePatcher::ReserveSpaceEnd(), doing offset adjustment.
+  uint32_t ReserveSpaceEnd(uint32_t offset) {
+    offset += adjustment_;
+    offset = relative_patcher_->ReserveSpaceEnd(offset);
+    offset -= adjustment_;
+    return offset;
+  }
+
+  // Wrapper around RelativePatcher::WriteThunks(), doing offset adjustment.
+  uint32_t WriteThunks(OutputStream* out, uint32_t offset) {
+    offset += adjustment_;
+    offset = relative_patcher_->WriteThunks(out, offset);
+    if (offset != 0u) {  // 0u indicates write error.
+      offset -= adjustment_;
+    }
+    return offset;
+  }
+
+  // Wrapper around RelativePatcher::PatchCall(), doing offset adjustment.
+  void PatchCall(std::vector<uint8_t>* code,
+                 uint32_t literal_offset,
+                 uint32_t patch_offset,
+                 uint32_t target_offset) {
+    patch_offset += adjustment_;
+    target_offset += adjustment_;
+    relative_patcher_->PatchCall(code, literal_offset, patch_offset, target_offset);
+  }
+
+  // Wrapper around RelativePatcher::PatchDexCacheReference(), doing offset adjustment.
+  void PatchDexCacheReference(std::vector<uint8_t>* code,
+                              const LinkerPatch& patch,
+                              uint32_t patch_offset,
+                              uint32_t target_offset) {
+    patch_offset += adjustment_;
+    target_offset += adjustment_;
+    relative_patcher_->PatchDexCacheReference(code, patch, patch_offset, target_offset);
+  }
+
+  // Wrappers around RelativePatcher for statistics retrieval.
+  uint32_t CodeAlignmentSize() const;
+  uint32_t RelativeCallThunksSize() const;
+  uint32_t MiscThunksSize() const;
+
+ private:
+  // Map method reference to assigned offset.
+  // Wrap the map in a class implementing linker::RelativePatcherTargetProvider.
+  class MethodOffsetMap : public linker::RelativePatcherTargetProvider {
+   public:
+    std::pair<bool, uint32_t> FindMethodOffset(MethodReference ref) OVERRIDE;
+    SafeMap<MethodReference, uint32_t, MethodReferenceComparator> map;
+  };
+
+  MethodOffsetMap method_offset_map_;
+  std::unique_ptr<RelativePatcher> relative_patcher_;
+  uint32_t adjustment_;
+  InstructionSet instruction_set_;
+
+  uint32_t start_size_code_alignment_;
+  uint32_t start_size_relative_call_thunks_;
+  uint32_t start_size_misc_thunks_;
+
+  friend class MultiOatRelativePatcherTest;
+
+  DISALLOW_COPY_AND_ASSIGN(MultiOatRelativePatcher);
+};
+
+}  // namespace linker
+}  // namespace art
+
+#endif  // ART_COMPILER_LINKER_MULTI_OAT_RELATIVE_PATCHER_H_