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diff --git a/contrib/llvm/lib/DebugInfo/DWARFContext.h b/contrib/llvm/lib/DebugInfo/DWARFContext.h
new file mode 100644
index 000000000000..03863ab8b1e2
--- /dev/null
+++ b/contrib/llvm/lib/DebugInfo/DWARFContext.h
@@ -0,0 +1,241 @@
+//===-- DWARFContext.h ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===/
+
+#ifndef LLVM_DEBUGINFO_DWARFCONTEXT_H
+#define LLVM_DEBUGINFO_DWARFCONTEXT_H
+
+#include "DWARFCompileUnit.h"
+#include "DWARFDebugAranges.h"
+#include "DWARFDebugFrame.h"
+#include "DWARFDebugLine.h"
+#include "DWARFDebugLoc.h"
+#include "DWARFDebugRangeList.h"
+#include "DWARFTypeUnit.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/DebugInfo/DIContext.h"
+
+namespace llvm {
+
+/// DWARFContext
+/// This data structure is the top level entity that deals with dwarf debug
+/// information parsing. The actual data is supplied through pure virtual
+/// methods that a concrete implementation provides.
+class DWARFContext : public DIContext {
+  SmallVector<DWARFCompileUnit *, 1> CUs;
+  SmallVector<DWARFTypeUnit *, 1> TUs;
+  OwningPtr<DWARFDebugAbbrev> Abbrev;
+  OwningPtr<DWARFDebugLoc> Loc;
+  OwningPtr<DWARFDebugAranges> Aranges;
+  OwningPtr<DWARFDebugLine> Line;
+  OwningPtr<DWARFDebugFrame> DebugFrame;
+
+  SmallVector<DWARFCompileUnit *, 1> DWOCUs;
+  OwningPtr<DWARFDebugAbbrev> AbbrevDWO;
+
+  DWARFContext(DWARFContext &) LLVM_DELETED_FUNCTION;
+  DWARFContext &operator=(DWARFContext &) LLVM_DELETED_FUNCTION;
+
+  /// Read compile units from the debug_info section and store them in CUs.
+  void parseCompileUnits();
+
+  /// Read type units from the debug_types sections and store them in CUs.
+  void parseTypeUnits();
+
+  /// Read compile units from the debug_info.dwo section and store them in
+  /// DWOCUs.
+  void parseDWOCompileUnits();
+
+public:
+  struct Section {
+    StringRef Data;
+    RelocAddrMap Relocs;
+  };
+
+  DWARFContext() : DIContext(CK_DWARF) {}
+  virtual ~DWARFContext();
+
+  static bool classof(const DIContext *DICtx) {
+    return DICtx->getKind() == CK_DWARF;
+  }
+
+  virtual void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All);
+
+  /// Get the number of compile units in this context.
+  unsigned getNumCompileUnits() {
+    if (CUs.empty())
+      parseCompileUnits();
+    return CUs.size();
+  }
+
+  /// Get the number of compile units in this context.
+  unsigned getNumTypeUnits() {
+    if (TUs.empty())
+      parseTypeUnits();
+    return TUs.size();
+  }
+
+  /// Get the number of compile units in the DWO context.
+  unsigned getNumDWOCompileUnits() {
+    if (DWOCUs.empty())
+      parseDWOCompileUnits();
+    return DWOCUs.size();
+  }
+
+  /// Get the compile unit at the specified index for this compile unit.
+  DWARFCompileUnit *getCompileUnitAtIndex(unsigned index) {
+    if (CUs.empty())
+      parseCompileUnits();
+    return CUs[index];
+  }
+
+  /// Get the type unit at the specified index for this compile unit.
+  DWARFTypeUnit *getTypeUnitAtIndex(unsigned index) {
+    if (TUs.empty())
+      parseTypeUnits();
+    return TUs[index];
+  }
+
+  /// Get the compile unit at the specified index for the DWO compile units.
+  DWARFCompileUnit *getDWOCompileUnitAtIndex(unsigned index) {
+    if (DWOCUs.empty())
+      parseDWOCompileUnits();
+    return DWOCUs[index];
+  }
+
+  /// Get a pointer to the parsed DebugAbbrev object.
+  const DWARFDebugAbbrev *getDebugAbbrev();
+
+  /// Get a pointer to the parsed DebugLoc object.
+  const DWARFDebugLoc *getDebugLoc();
+
+  /// Get a pointer to the parsed dwo abbreviations object.
+  const DWARFDebugAbbrev *getDebugAbbrevDWO();
+
+  /// Get a pointer to the parsed DebugAranges object.
+  const DWARFDebugAranges *getDebugAranges();
+
+  /// Get a pointer to the parsed frame information object.
+  const DWARFDebugFrame *getDebugFrame();
+
+  /// Get a pointer to a parsed line table corresponding to a compile unit.
+  const DWARFDebugLine::LineTable *
+  getLineTableForCompileUnit(DWARFCompileUnit *cu);
+
+  virtual DILineInfo getLineInfoForAddress(uint64_t Address,
+      DILineInfoSpecifier Specifier = DILineInfoSpecifier());
+  virtual DILineInfoTable getLineInfoForAddressRange(uint64_t Address,
+      uint64_t Size, DILineInfoSpecifier Specifier = DILineInfoSpecifier());
+  virtual DIInliningInfo getInliningInfoForAddress(uint64_t Address,
+      DILineInfoSpecifier Specifier = DILineInfoSpecifier());
+
+  virtual bool isLittleEndian() const = 0;
+  virtual uint8_t getAddressSize() const = 0;
+  virtual const Section &getInfoSection() = 0;
+  virtual const std::map<object::SectionRef, Section> &getTypesSections() = 0;
+  virtual StringRef getAbbrevSection() = 0;
+  virtual const Section &getLocSection() = 0;
+  virtual StringRef getARangeSection() = 0;
+  virtual StringRef getDebugFrameSection() = 0;
+  virtual const Section &getLineSection() = 0;
+  virtual StringRef getStringSection() = 0;
+  virtual StringRef getRangeSection() = 0;
+  virtual StringRef getPubNamesSection() = 0;
+  virtual StringRef getPubTypesSection() = 0;
+  virtual StringRef getGnuPubNamesSection() = 0;
+  virtual StringRef getGnuPubTypesSection() = 0;
+
+  // Sections for DWARF5 split dwarf proposal.
+  virtual const Section &getInfoDWOSection() = 0;
+  virtual StringRef getAbbrevDWOSection() = 0;
+  virtual StringRef getStringDWOSection() = 0;
+  virtual StringRef getStringOffsetDWOSection() = 0;
+  virtual StringRef getRangeDWOSection() = 0;
+  virtual StringRef getAddrSection() = 0;
+
+  static bool isSupportedVersion(unsigned version) {
+    return version == 2 || version == 3 || version == 4;
+  }
+private:
+  /// Return the compile unit that includes an offset (relative to .debug_info).
+  DWARFCompileUnit *getCompileUnitForOffset(uint32_t Offset);
+
+  /// Return the compile unit which contains instruction with provided
+  /// address.
+  DWARFCompileUnit *getCompileUnitForAddress(uint64_t Address);
+};
+
+/// DWARFContextInMemory is the simplest possible implementation of a
+/// DWARFContext. It assumes all content is available in memory and stores
+/// pointers to it.
+class DWARFContextInMemory : public DWARFContext {
+  virtual void anchor();
+  bool IsLittleEndian;
+  uint8_t AddressSize;
+  Section InfoSection;
+  std::map<object::SectionRef, Section> TypesSections;
+  StringRef AbbrevSection;
+  Section LocSection;
+  StringRef ARangeSection;
+  StringRef DebugFrameSection;
+  Section LineSection;
+  StringRef StringSection;
+  StringRef RangeSection;
+  StringRef PubNamesSection;
+  StringRef PubTypesSection;
+  StringRef GnuPubNamesSection;
+  StringRef GnuPubTypesSection;
+
+  // Sections for DWARF5 split dwarf proposal.
+  Section InfoDWOSection;
+  StringRef AbbrevDWOSection;
+  StringRef StringDWOSection;
+  StringRef StringOffsetDWOSection;
+  StringRef RangeDWOSection;
+  StringRef AddrSection;
+
+  SmallVector<MemoryBuffer*, 4> UncompressedSections;
+
+public:
+  DWARFContextInMemory(object::ObjectFile *);
+  ~DWARFContextInMemory();
+  virtual bool isLittleEndian() const { return IsLittleEndian; }
+  virtual uint8_t getAddressSize() const { return AddressSize; }
+  virtual const Section &getInfoSection() { return InfoSection; }
+  virtual const std::map<object::SectionRef, Section> &getTypesSections() {
+    return TypesSections;
+  }
+  virtual StringRef getAbbrevSection() { return AbbrevSection; }
+  virtual const Section &getLocSection() { return LocSection; }
+  virtual StringRef getARangeSection() { return ARangeSection; }
+  virtual StringRef getDebugFrameSection() { return DebugFrameSection; }
+  virtual const Section &getLineSection() { return LineSection; }
+  virtual StringRef getStringSection() { return StringSection; }
+  virtual StringRef getRangeSection() { return RangeSection; }
+  virtual StringRef getPubNamesSection() { return PubNamesSection; }
+  virtual StringRef getPubTypesSection() { return PubTypesSection; }
+  virtual StringRef getGnuPubNamesSection() { return GnuPubNamesSection; }
+  virtual StringRef getGnuPubTypesSection() { return GnuPubTypesSection; }
+
+  // Sections for DWARF5 split dwarf proposal.
+  virtual const Section &getInfoDWOSection() { return InfoDWOSection; }
+  virtual StringRef getAbbrevDWOSection() { return AbbrevDWOSection; }
+  virtual StringRef getStringDWOSection() { return StringDWOSection; }
+  virtual StringRef getStringOffsetDWOSection() {
+    return StringOffsetDWOSection;
+  }
+  virtual StringRef getRangeDWOSection() { return RangeDWOSection; }
+  virtual StringRef getAddrSection() {
+    return AddrSection;
+  }
+};
+
+}
+
+#endif