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diff --git a/contrib/llvm/include/llvm/MC/MCObjectSymbolizer.h b/contrib/llvm/include/llvm/MC/MCObjectSymbolizer.h
new file mode 100644
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+++ b/contrib/llvm/include/llvm/MC/MCObjectSymbolizer.h
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+//===-- llvm/MC/MCObjectSymbolizer.h --------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the MCObjectSymbolizer class, an MCSymbolizer that is
+// backed by an object::ObjectFile.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCOBJECTSYMBOLIZER_H
+#define LLVM_MC_MCOBJECTSYMBOLIZER_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/MC/MCSymbolizer.h"
+#include "llvm/Object/ObjectFile.h"
+#include <vector>
+
+namespace llvm {
+
+class MCExpr;
+class MCInst;
+class MCRelocationInfo;
+class raw_ostream;
+
+/// \brief An ObjectFile-backed symbolizer.
+class MCObjectSymbolizer : public MCSymbolizer {
+protected:
+  const object::ObjectFile *Obj;
+
+  // Map a load address to the first relocation that applies there. As far as I
+  // know, if there are several relocations at the exact same address, they are
+  // related and the others can be determined from the first that was found in
+  // the relocation table. For instance, on x86-64 mach-o, a SUBTRACTOR
+  // relocation (referencing the minuend symbol) is followed by an UNSIGNED
+  // relocation (referencing the subtrahend symbol).
+  const object::RelocationRef *findRelocationAt(uint64_t Addr);
+  const object::SectionRef *findSectionContaining(uint64_t Addr);
+
+  MCObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo,
+                     const object::ObjectFile *Obj);
+
+public:
+  /// \name Overridden MCSymbolizer methods:
+  /// @{
+  bool tryAddingSymbolicOperand(MCInst &MI, raw_ostream &cStream,
+                                int64_t Value, uint64_t Address,
+                                bool IsBranch, uint64_t Offset,
+                                uint64_t InstSize);
+
+  void tryAddingPcLoadReferenceComment(raw_ostream &cStream,
+                                       int64_t Value, uint64_t Address);
+  /// @}
+
+  /// \brief Look for an external function symbol at \p Addr.
+  /// (References through the ELF PLT, Mach-O stubs, and similar).
+  /// \returns An MCExpr representing the external symbol, or 0 if not found.
+  virtual StringRef findExternalFunctionAt(uint64_t Addr);
+
+  /// \brief Create an object symbolizer for \p Obj.
+  static MCObjectSymbolizer *
+    createObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo,
+                           const object::ObjectFile *Obj);
+
+private:
+  typedef DenseMap<uint64_t, object::RelocationRef> AddrToRelocMap;
+  typedef std::vector<object::SectionRef> SortedSectionList;
+  SortedSectionList SortedSections;
+  AddrToRelocMap AddrToReloc;
+
+  void buildSectionList();
+  void buildRelocationByAddrMap();
+};
+
+}
+
+#endif