Revert "Fix the build broken by r189315." and "Move everything depending on Object/MachOFormat.h over to Support/MachO.h."

This reverts commits r189319 and r189315. r189315 broke some tests on what I
believe are big-endian platforms.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189321 91177308-0d34-0410-b5e6-96231b3b80d8

20 files changed, 1369 insertions, 936 deletions

diff --git a/include/llvm/MC/MCMachObjectWriter.h b/include/llvm/MC/MCMachObjectWriter.h
index ae3beb10c7..3c9a588d04 100644
--- a/include/llvm/MC/MCMachObjectWriter.h
+++ b/include/llvm/MC/MCMachObjectWriter.h
@@ -15,8 +15,8 @@
 #include "llvm/ADT/SmallString.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCObjectWriter.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/DataTypes.h"
-#include "llvm/Support/MachO.h"
 #include <vector>
 
 namespace llvm {
@@ -98,7 +98,7 @@ class MachObjectWriter : public MCObjectWriter {
   /// @{
 
   llvm::DenseMap<const MCSectionData*,
-                 std::vector<MachO::any_relocation_info> > Relocations;
+                 std::vector<object::macho::RelocationEntry> > Relocations;
   llvm::DenseMap<const MCSectionData*, unsigned> IndirectSymBase;
 
   /// @}
@@ -155,8 +155,9 @@ public:
 
   bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
   bool isARM() const {
-    uint32_t CPUType = TargetObjectWriter->getCPUType() & ~MachO::CPU_ARCH_MASK;
-    return CPUType == MachO::CPU_TYPE_ARM;
+    uint32_t CPUType = TargetObjectWriter->getCPUType() &
+      ~object::mach::CTFM_ArchMask;
+    return CPUType == object::mach::CTM_ARM;
   }
 
   /// @}
@@ -212,21 +213,7 @@ public:
   //    these through in many cases.
 
   void addRelocation(const MCSectionData *SD,
-                     MachO::relocation_info &MRE) {
-    MachO::any_relocation_info AMRE;
-    memcpy(&AMRE, &MRE, sizeof(MRE));
-    Relocations[SD].push_back(AMRE);
-  }
-
-  void addRelocation(const MCSectionData *SD,
-                     MachO::scattered_relocation_info &SMRE) {
-    MachO::any_relocation_info MRE;
-    memcpy(&MRE, &SMRE, sizeof(MRE));
-    Relocations[SD].push_back(MRE);
-  }
-
-  void addRelocation(const MCSectionData *SD,
-                     MachO::any_relocation_info &MRE) {
+                     object::macho::RelocationEntry &MRE) {
     Relocations[SD].push_back(MRE);
   }
 
diff --git a/include/llvm/Object/MachO.h b/include/llvm/Object/MachO.h
index f3f391e07f..caa642a3c5 100644
--- a/include/llvm/Object/MachO.h
+++ b/include/llvm/Object/MachO.h
@@ -18,8 +18,8 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Triple.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Object/ObjectFile.h"
-#include "llvm/Support/MachO.h"
 
 namespace llvm {
 namespace object {
@@ -53,7 +53,7 @@ class MachOObjectFile : public ObjectFile {
 public:
   struct LoadCommandInfo {
     const char *Ptr;      // Where in memory the load command is.
-    MachO::load_command C; // The command itself.
+    macho::LoadCommand C; // The command itself.
   };
 
   MachOObjectFile(MemoryBuffer *Object, bool IsLittleEndian, bool Is64Bits,
@@ -146,53 +146,50 @@ public:
   ArrayRef<char> getSectionRawFinalSegmentName(DataRefImpl Sec) const;
 
   // MachO specific Info about relocations.
-  bool isRelocationScattered(const MachO::any_relocation_info &RE) const;
-  unsigned getPlainRelocationSymbolNum(
-                                    const MachO::any_relocation_info &RE) const;
-  bool getPlainRelocationExternal(const MachO::any_relocation_info &RE) const;
-  bool getScatteredRelocationScattered(
-                                    const MachO::any_relocation_info &RE) const;
-  uint32_t getScatteredRelocationValue(
-                                    const MachO::any_relocation_info &RE) const;
-  unsigned getAnyRelocationAddress(const MachO::any_relocation_info &RE) const;
-  unsigned getAnyRelocationPCRel(const MachO::any_relocation_info &RE) const;
-  unsigned getAnyRelocationLength(const MachO::any_relocation_info &RE) const;
-  unsigned getAnyRelocationType(const MachO::any_relocation_info &RE) const;
-  SectionRef getRelocationSection(const MachO::any_relocation_info &RE) const;
+  bool isRelocationScattered(const macho::RelocationEntry &RE) const;
+  unsigned getPlainRelocationSymbolNum(const macho::RelocationEntry &RE) const;
+  bool getPlainRelocationExternal(const macho::RelocationEntry &RE) const;
+  bool getScatteredRelocationScattered(const macho::RelocationEntry &RE) const;
+  uint32_t getScatteredRelocationValue(const macho::RelocationEntry &RE) const;
+  unsigned getAnyRelocationAddress(const macho::RelocationEntry &RE) const;
+  unsigned getAnyRelocationPCRel(const macho::RelocationEntry &RE) const;
+  unsigned getAnyRelocationLength(const macho::RelocationEntry &RE) const;
+  unsigned getAnyRelocationType(const macho::RelocationEntry &RE) const;
+  SectionRef getRelocationSection(const macho::RelocationEntry &RE) const;
 
   // Walk load commands.
   LoadCommandInfo getFirstLoadCommandInfo() const;
   LoadCommandInfo getNextLoadCommandInfo(const LoadCommandInfo &L) const;
 
   // MachO specific structures.
-  MachO::section getSection(DataRefImpl DRI) const;
-  MachO::section_64 getSection64(DataRefImpl DRI) const;
-  MachO::section getSection(const LoadCommandInfo &L, unsigned Index) const;
-  MachO::section_64 getSection64(const LoadCommandInfo &L,unsigned Index) const;
-  MachO::nlist getSymbolTableEntry(DataRefImpl DRI) const;
-  MachO::nlist_64 getSymbol64TableEntry(DataRefImpl DRI) const;
-
-  MachO::linkedit_data_command
+  macho::Section getSection(DataRefImpl DRI) const;
+  macho::Section64 getSection64(DataRefImpl DRI) const;
+  macho::Section getSection(const LoadCommandInfo &L, unsigned Index) const;
+  macho::Section64 getSection64(const LoadCommandInfo &L, unsigned Index) const;
+  macho::SymbolTableEntry getSymbolTableEntry(DataRefImpl DRI) const;
+  macho::Symbol64TableEntry getSymbol64TableEntry(DataRefImpl DRI) const;
+
+  macho::LinkeditDataLoadCommand
   getLinkeditDataLoadCommand(const LoadCommandInfo &L) const;
-  MachO::segment_command
+  macho::SegmentLoadCommand
   getSegmentLoadCommand(const LoadCommandInfo &L) const;
-  MachO::segment_command_64
+  macho::Segment64LoadCommand
   getSegment64LoadCommand(const LoadCommandInfo &L) const;
-  MachO::linker_options_command
+  macho::LinkerOptionsLoadCommand
   getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const;
 
-  MachO::any_relocation_info getRelocation(DataRefImpl Rel) const;
-  MachO::data_in_code_entry getDice(DataRefImpl Rel) const;
-  MachO::mach_header getHeader() const;
-  MachO::mach_header_64 getHeader64() const;
-  uint32_t
-  getIndirectSymbolTableEntry(const MachO::dysymtab_command &DLC,
+  macho::RelocationEntry getRelocation(DataRefImpl Rel) const;
+  macho::DataInCodeTableEntry getDice(DataRefImpl Rel) const;
+  macho::Header getHeader() const;
+  macho::Header64Ext getHeader64Ext() const;
+  macho::IndirectSymbolTableEntry
+  getIndirectSymbolTableEntry(const macho::DysymtabLoadCommand &DLC,
                               unsigned Index) const;
-  MachO::data_in_code_entry getDataInCodeTableEntry(uint32_t DataOffset,
-                                                    unsigned Index) const;
-  MachO::symtab_command getSymtabLoadCommand() const;
-  MachO::dysymtab_command getDysymtabLoadCommand() const;
-  MachO::linkedit_data_command getDataInCodeLoadCommand() const;
+  macho::DataInCodeTableEntry getDataInCodeTableEntry(uint32_t DataOffset,
+                                                      unsigned Index) const;
+  macho::SymtabLoadCommand getSymtabLoadCommand() const;
+  macho::DysymtabLoadCommand getDysymtabLoadCommand() const;
+  macho::LinkeditDataLoadCommand getDataInCodeLoadCommand() const;
 
   StringRef getStringTableData() const;
   bool is64Bit() const;
@@ -226,8 +223,8 @@ inline bool DiceRef::operator<(const DiceRef &Other) const {
 
 inline error_code DiceRef::getNext(DiceRef &Result) const {
   DataRefImpl Rel = DicePimpl;
-  const MachO::data_in_code_entry *P =
-    reinterpret_cast<const MachO::data_in_code_entry *>(Rel.p);
+  const macho::DataInCodeTableEntry *P =
+    reinterpret_cast<const macho::DataInCodeTableEntry *>(Rel.p);
   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
   Result = DiceRef(Rel, OwningObject);
   return object_error::success;
@@ -240,24 +237,24 @@ inline error_code DiceRef::getNext(DiceRef &Result) const {
 inline error_code DiceRef::getOffset(uint32_t &Result) const {
   const MachOObjectFile *MachOOF =
     static_cast<const MachOObjectFile *>(OwningObject);
-  MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
-  Result = Dice.offset;
+  macho::DataInCodeTableEntry Dice = MachOOF->getDice(DicePimpl);
+  Result = Dice.Offset;
   return object_error::success;
 }
 
 inline error_code DiceRef::getLength(uint16_t &Result) const {
   const MachOObjectFile *MachOOF =
     static_cast<const MachOObjectFile *>(OwningObject);
-  MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
-  Result = Dice.length;
+  macho::DataInCodeTableEntry Dice = MachOOF->getDice(DicePimpl);
+  Result = Dice.Length;
   return object_error::success;
 }
 
 inline error_code DiceRef::getKind(uint16_t &Result) const {
   const MachOObjectFile *MachOOF =
     static_cast<const MachOObjectFile *>(OwningObject);
-  MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
-  Result = Dice.kind;
+  macho::DataInCodeTableEntry Dice = MachOOF->getDice(DicePimpl);
+  Result = Dice.Kind;
   return object_error::success;
 }
 
diff --git a/include/llvm/Object/MachOFormat.h b/include/llvm/Object/MachOFormat.h
new file mode 100644
index 0000000000..2bbad0ac93
--- /dev/null
+++ b/include/llvm/Object/MachOFormat.h
@@ -0,0 +1,452 @@
+//===- MachOFormat.h - Mach-O Format Structures And Constants ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares various structures and constants which are platform
+// independent and can be shared by any client which wishes to interact with
+// Mach object files.
+//
+// The definitions here are purposely chosen to match the LLVM style as opposed
+// to following the platform specific definition of the format.
+//
+// On a Mach system, see the <mach-o/...> includes for more information, in
+// particular <mach-o/loader.h>.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECT_MACHOFORMAT_H
+#define LLVM_OBJECT_MACHOFORMAT_H
+
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
+namespace object {
+
+/// General Mach platform information.
+namespace mach {
+  /// @name CPU Type and Subtype Information
+  /// {
+
+  /// \brief Capability bits used in CPU type encoding.
+  enum CPUTypeFlagsMask {
+    CTFM_ArchMask =  0xFF000000,
+    CTFM_ArchABI64 = 0x01000000
+  };
+
+  /// \brief Machine type IDs used in CPU type encoding.
+  enum CPUTypeMachine {
+    CTM_i386      = 7,
+    CTM_x86_64    = CTM_i386 | CTFM_ArchABI64,
+    CTM_ARM       = 12,
+    CTM_SPARC     = 14,
+    CTM_PowerPC   = 18,
+    CTM_PowerPC64 = CTM_PowerPC | CTFM_ArchABI64
+  };
+
+  /// \brief Capability bits used in CPU subtype encoding.
+  enum CPUSubtypeFlagsMask {
+    CSFM_SubtypeMask =  0xFF000000,
+    CSFM_SubtypeLib64 = 0x80000000
+  };
+
+  /// \brief ARM Machine Subtypes.
+  enum CPUSubtypeARM {
+    CSARM_ALL    = 0,
+    CSARM_V4T    = 5,
+    CSARM_V6     = 6,
+    CSARM_V5TEJ  = 7,
+    CSARM_XSCALE = 8,
+    CSARM_V7     = 9,
+    CSARM_V7F    = 10,
+    CSARM_V7S    = 11,
+    CSARM_V7K    = 12,
+    CSARM_V6M    = 14,
+    CSARM_V7M    = 15,
+    CSARM_V7EM   = 16
+  };
+
+  /// \brief PowerPC Machine Subtypes.
+  enum CPUSubtypePowerPC {
+    CSPPC_ALL = 0
+  };
+
+  /// \brief SPARC Machine Subtypes.
+  enum CPUSubtypeSPARC {
+    CSSPARC_ALL = 0
+  };
+
+  /// \brief x86 Machine Subtypes.
+  enum CPUSubtypeX86 {
+    CSX86_ALL = 3
+  };
+
+  /// @}
+
+} // end namespace mach
+
+/// Format information for Mach object files.
+namespace macho {
+  /// \brief Constants for structure sizes.
+  enum StructureSizes {
+    Header32Size = 28,
+    Header64Size = 32,
+    FatHeaderSize = 8,
+    FatArchHeaderSize = 20,
+    SegmentLoadCommand32Size = 56,
+    SegmentLoadCommand64Size = 72,
+    Section32Size = 68,
+    Section64Size = 80,
+    SymtabLoadCommandSize = 24,
+    DysymtabLoadCommandSize = 80,
+    Nlist32Size = 12,
+    Nlist64Size = 16,
+    RelocationInfoSize = 8,
+    LinkeditLoadCommandSize = 16
+  };
+
+  /// \brief Constants for header magic field.
+  enum HeaderMagic {
+    HM_Object32 = 0xFEEDFACE,  ///< 32-bit mach object file
+    HM_Object64 = 0xFEEDFACF,  ///< 64-bit mach object file
+    HM_Universal = 0xCAFEBABE  ///< Universal object file
+  };
+
+  /// \brief Header common to all Mach object files.
+  struct Header {
+    uint32_t Magic;
+    uint32_t CPUType;
+    uint32_t CPUSubtype;
+    uint32_t FileType;
+    uint32_t NumLoadCommands;
+    uint32_t SizeOfLoadCommands;
+    uint32_t Flags;
+  };
+
+  /// \brief Extended header for 64-bit object files.
+  struct Header64Ext {
+    uint32_t Reserved;
+  };
+
+  /// \brief Header for universal object files.
+  struct FatHeader {
+    uint32_t Magic;
+    uint32_t NumFatArch;
+  };
+
+  /// \brief Header for a single-architecture object file in a
+  /// universal binary.
+  struct FatArchHeader {
+    uint32_t CPUType;
+    uint32_t CPUSubtype;
+    uint32_t Offset;
+    uint32_t Size;
+    uint32_t Align;
+  };
+
+  // See <mach-o/loader.h>.
+  enum HeaderFileType {
+    HFT_Object = 0x1
+  };
+
+  enum HeaderFlags {
+    HF_SubsectionsViaSymbols = 0x2000
+  };
+
+  enum LoadCommandType {
+    LCT_Segment = 0x1,
+    LCT_Symtab = 0x2,
+    LCT_Dysymtab = 0xb,
+    LCT_Segment64 = 0x19,
+    LCT_UUID = 0x1b,
+    LCT_CodeSignature = 0x1d,
+    LCT_SegmentSplitInfo = 0x1e,
+    LCT_FunctionStarts = 0x26,
+    LCT_DataInCode = 0x29,
+    LCT_LinkerOptions = 0x2D
+  };
+
+  /// \brief Load command structure.
+  struct LoadCommand {
+    uint32_t Type;
+    uint32_t Size;
+  };
+
+  /// @name Load Command Structures
+  /// @{
+
+  struct SegmentLoadCommand {
+    uint32_t Type;
+    uint32_t Size;
+    char Name[16];
+    uint32_t VMAddress;
+    uint32_t VMSize;
+    uint32_t FileOffset;
+    uint32_t FileSize;
+    uint32_t MaxVMProtection;
+    uint32_t InitialVMProtection;
+    uint32_t NumSections;
+    uint32_t Flags;
+  };
+
+  struct Segment64LoadCommand {
+    uint32_t Type;
+    uint32_t Size;
+    char Name[16];
+    uint64_t VMAddress;
+    uint64_t VMSize;
+    uint64_t FileOffset;
+    uint64_t FileSize;
+    uint32_t MaxVMProtection;
+    uint32_t InitialVMProtection;
+    uint32_t NumSections;
+    uint32_t Flags;
+  };
+
+  struct SymtabLoadCommand {
+    uint32_t Type;
+    uint32_t Size;
+    uint32_t SymbolTableOffset;
+    uint32_t NumSymbolTableEntries;
+    uint32_t StringTableOffset;
+    uint32_t StringTableSize;
+  };
+
+  struct DysymtabLoadCommand {
+    uint32_t Type;
+    uint32_t Size;
+
+    uint32_t LocalSymbolsIndex;
+    uint32_t NumLocalSymbols;
+
+    uint32_t ExternalSymbolsIndex;
+    uint32_t NumExternalSymbols;
+
+    uint32_t UndefinedSymbolsIndex;
+    uint32_t NumUndefinedSymbols;
+
+    uint32_t TOCOffset;
+    uint32_t NumTOCEntries;
+
+    uint32_t ModuleTableOffset;
+    uint32_t NumModuleTableEntries;
+
+    uint32_t ReferenceSymbolTableOffset;
+    uint32_t NumReferencedSymbolTableEntries;
+
+    uint32_t IndirectSymbolTableOffset;
+    uint32_t NumIndirectSymbolTableEntries;
+
+    uint32_t ExternalRelocationTableOffset;
+    uint32_t NumExternalRelocationTableEntries;
+
+    uint32_t LocalRelocationTableOffset;
+    uint32_t NumLocalRelocationTableEntries;
+  };
+
+  struct LinkeditDataLoadCommand {
+    uint32_t Type;
+    uint32_t Size;
+    uint32_t DataOffset;
+    uint32_t DataSize;
+  };
+
+  struct LinkerOptionsLoadCommand {
+    uint32_t Type;
+    uint32_t Size;
+    uint32_t Count;
+    // Load command is followed by Count number of zero-terminated UTF8 strings,
+    // and then zero-filled to be 4-byte aligned.
+  };
+
+  /// @}
+  /// @name Section Data
+  /// @{
+
+  enum SectionFlags {
+    SF_PureInstructions = 0x80000000
+  };
+
+  struct Section {
+    char Name[16];
+    char SegmentName[16];
+    uint32_t Address;
+    uint32_t Size;
+    uint32_t Offset;
+    uint32_t Align;
+    uint32_t RelocationTableOffset;
+    uint32_t NumRelocationTableEntries;
+    uint32_t Flags;
+    uint32_t Reserved1;
+    uint32_t Reserved2;
+  };
+  struct Section64 {
+    char Name[16];
+    char SegmentName[16];
+    uint64_t Address;
+    uint64_t Size;
+    uint32_t Offset;
+    uint32_t Align;
+    uint32_t RelocationTableOffset;
+    uint32_t NumRelocationTableEntries;
+    uint32_t Flags;
+    uint32_t Reserved1;
+    uint32_t Reserved2;
+    uint32_t Reserved3;
+  };
+
+  /// @}
+  /// @name Symbol Table Entries
+  /// @{
+
+  struct SymbolTableEntry {
+    uint32_t StringIndex;
+    uint8_t Type;
+    uint8_t SectionIndex;
+    uint16_t Flags;
+    uint32_t Value;
+  };
+  // Despite containing a uint64_t, this structure is only 4-byte aligned within
+  // a MachO file.
+#pragma pack(push)
+#pragma pack(4)
+  struct Symbol64TableEntry {
+    uint32_t StringIndex;
+    uint8_t Type;
+    uint8_t SectionIndex;
+    uint16_t Flags;
+    uint64_t Value;
+  };
+#pragma pack(pop)
+
+  /// @}
+  /// @name Data-in-code Table Entry
+  /// @{
+
+  // See <mach-o/loader.h>.
+  enum DataRegionType { Data = 1, JumpTable8, JumpTable16, JumpTable32 };
+  struct DataInCodeTableEntry {
+    uint32_t Offset;  /* from mach_header to start of data region */
+    uint16_t Length;  /* number of bytes in data region */
+    uint16_t Kind;    /* a DataRegionType value  */
+  };
+
+  /// @}
+  /// @name Indirect Symbol Table
+  /// @{
+
+  struct IndirectSymbolTableEntry {
+    uint32_t Index;
+  };
+
+  /// @}
+  /// @name Relocation Data
+  /// @{
+
+  struct RelocationEntry {
+    uint32_t Word0;
+    uint32_t Word1;
+  };
+
+  /// @}
+
+  // See <mach-o/nlist.h>.
+  enum SymbolTypeType {
+    STT_Undefined = 0x00,
+    STT_Absolute  = 0x02,
+    STT_Section   = 0x0e
+  };
+
+  enum SymbolTypeFlags {
+    // If any of these bits are set, then the entry is a stab entry number (see
+    // <mach-o/stab.h>. Otherwise the other masks apply.
+    STF_StabsEntryMask = 0xe0,
+
+    STF_TypeMask       = 0x0e,
+    STF_External       = 0x01,
+    STF_PrivateExtern  = 0x10
+  };
+
+  /// IndirectSymbolFlags - Flags for encoding special values in the indirect
+  /// symbol entry.
+  enum IndirectSymbolFlags {
+    ISF_Local    = 0x80000000,
+    ISF_Absolute = 0x40000000
+  };
+
+  /// RelocationFlags - Special flags for addresses.
+  enum RelocationFlags {
+    RF_Scattered = 0x80000000
+  };
+
+  /// Common relocation info types.
+  enum RelocationInfoType {
+    RIT_Vanilla             = 0,
+    RIT_Pair                = 1,
+    RIT_Difference          = 2
+  };
+
+  /// Generic relocation info types, which are shared by some (but not all)
+  /// platforms.
+  enum RelocationInfoType_Generic {
+    RIT_Generic_PreboundLazyPointer = 3,
+    RIT_Generic_LocalDifference     = 4,
+    RIT_Generic_TLV                 = 5
+  };
+
+  /// X86_64 uses its own relocation types.
+  enum RelocationInfoTypeX86_64 {
+    // Note that x86_64 doesn't even share the common relocation types.
+    RIT_X86_64_Unsigned   = 0,
+    RIT_X86_64_Signed     = 1,
+    RIT_X86_64_Branch     = 2,
+    RIT_X86_64_GOTLoad    = 3,
+    RIT_X86_64_GOT        = 4,
+    RIT_X86_64_Subtractor = 5,
+    RIT_X86_64_Signed1    = 6,
+    RIT_X86_64_Signed2    = 7,
+    RIT_X86_64_Signed4    = 8,
+    RIT_X86_64_TLV        = 9
+  };
+
+  /// ARM uses its own relocation types.
+  enum RelocationInfoTypeARM {
+    RIT_ARM_LocalDifference = 3,
+    RIT_ARM_PreboundLazyPointer = 4,
+    RIT_ARM_Branch24Bit = 5,
+    RIT_ARM_ThumbBranch22Bit = 6,
+    RIT_ARM_ThumbBranch32Bit = 7,
+    RIT_ARM_Half = 8,
+    RIT_ARM_HalfDifference = 9
+
+  };
+
+  /// PPC relocation types from <mach-o/ppc/reloc.h>
+  enum RelocationInfoTypePPC {
+    RIT_PPC_BR14 = RIT_Pair +1,
+    RIT_PPC_BR24,
+    RIT_PPC_HI16,
+    RIT_PPC_LO16,
+    RIT_PPC_HA16,
+    RIT_PPC_LO14,
+    RIT_PPC_SECTDIFF,
+    RIT_PPC_PB_LA_PTR,
+    RIT_PPC_HI16_SECTDIFF,
+    RIT_PPC_LO16_SECTDIFF,
+    RIT_PPC_HA16_SECTDIFF,
+    RIT_PPC_JBSR,
+    RIT_PPC_LO14_SECTDIFF,
+    RIT_PPC_LOCAL_SECTDIFF,
+    RIT_PPC_TLV
+  };
+
+} // end namespace macho
+
+} // end namespace object
+} // end namespace llvm
+
+#endif
diff --git a/include/llvm/Object/MachOUniversal.h b/include/llvm/Object/MachOUniversal.h
index c5d1359256..57432826b8 100644
--- a/include/llvm/Object/MachOUniversal.h
+++ b/include/llvm/Object/MachOUniversal.h
@@ -18,7 +18,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Object/Binary.h"
-#include "llvm/Support/MachO.h"
+#include "llvm/Object/MachOFormat.h"
 
 namespace llvm {
 namespace object {
@@ -35,7 +35,7 @@ public:
     /// \brief Index of object in the universal binary.
     uint32_t Index;
     /// \brief Descriptor of the object.
-    MachO::fat_arch Header;
+    macho::FatArchHeader Header;
 
   public:
     ObjectForArch(const MachOUniversalBinary *Parent, uint32_t Index);
@@ -50,7 +50,7 @@ public:
     }
 
     ObjectForArch getNext() const { return ObjectForArch(Parent, Index + 1); }
-    uint32_t getCPUType() const { return Header.cputype; }
+    uint32_t getCPUType() const { return Header.CPUType; }
 
     error_code getAsObjectFile(OwningPtr<ObjectFile> &Result) const;
   };
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
index d3431286cf..2f4df6b962 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
@@ -180,7 +180,7 @@ bool RuntimeDyldMachO::resolveI386Relocation(uint8_t *LocalAddress,
   switch (Type) {
   default:
     llvm_unreachable("Invalid relocation type!");
-  case MachO::GENERIC_RELOC_VANILLA: {
+  case macho::RIT_Vanilla: {
     uint8_t *p = LocalAddress;
     uint64_t ValueToWrite = Value + Addend;
     for (unsigned i = 0; i < Size; ++i) {
@@ -189,9 +189,9 @@ bool RuntimeDyldMachO::resolveI386Relocation(uint8_t *LocalAddress,
     }
     return false;
   }
-  case MachO::GENERIC_RELOC_SECTDIFF:
-  case MachO::GENERIC_RELOC_LOCAL_SECTDIFF:
-  case MachO::GENERIC_RELOC_PB_LA_PTR:
+  case macho::RIT_Difference:
+  case macho::RIT_Generic_LocalDifference:
+  case macho::RIT_Generic_PreboundLazyPointer:
     return Error("Relocation type not implemented yet!");
   }
 }
@@ -213,12 +213,12 @@ bool RuntimeDyldMachO::resolveX86_64Relocation(uint8_t *LocalAddress,
   switch(Type) {
   default:
     llvm_unreachable("Invalid relocation type!");
-  case MachO::X86_64_RELOC_SIGNED_1:
-  case MachO::X86_64_RELOC_SIGNED_2:
-  case MachO::X86_64_RELOC_SIGNED_4:
-  case MachO::X86_64_RELOC_SIGNED:
-  case MachO::X86_64_RELOC_UNSIGNED:
-  case MachO::X86_64_RELOC_BRANCH: {
+  case macho::RIT_X86_64_Signed1:
+  case macho::RIT_X86_64_Signed2:
+  case macho::RIT_X86_64_Signed4:
+  case macho::RIT_X86_64_Signed:
+  case macho::RIT_X86_64_Unsigned:
+  case macho::RIT_X86_64_Branch: {
     Value += Addend;
     // Mask in the target value a byte at a time (we don't have an alignment
     // guarantee for the target address, so this is safest).
@@ -229,10 +229,10 @@ bool RuntimeDyldMachO::resolveX86_64Relocation(uint8_t *LocalAddress,
     }
     return false;
   }
-  case MachO::X86_64_RELOC_GOT_LOAD:
-  case MachO::X86_64_RELOC_GOT:
-  case MachO::X86_64_RELOC_SUBTRACTOR:
-  case MachO::X86_64_RELOC_TLV:
+  case macho::RIT_X86_64_GOTLoad:
+  case macho::RIT_X86_64_GOT:
+  case macho::RIT_X86_64_Subtractor:
+  case macho::RIT_X86_64_TLV:
     return Error("Relocation type not implemented yet!");
   }
 }
@@ -257,17 +257,17 @@ bool RuntimeDyldMachO::resolveARMRelocation(uint8_t *LocalAddress,
   switch(Type) {
   default:
     llvm_unreachable("Invalid relocation type!");
-  case MachO::ARM_RELOC_VANILLA: {
+  case macho::RIT_Vanilla: {
     // Mask in the target value a byte at a time (we don't have an alignment
     // guarantee for the target address, so this is safest).
     uint8_t *p = (uint8_t*)LocalAddress;
     for (unsigned i = 0; i < Size; ++i) {
-      *p++ = (uint8_t)(Value & 0xff);
+      *p++ = (uint8_t)Value;
       Value >>= 8;
     }
     break;
   }
-  case MachO::ARM_RELOC_BR24: {
+  case macho::RIT_ARM_Branch24Bit: {
     // Mask the value into the target address. We know instructions are
     // 32-bit aligned, so we can do it all at once.
     uint32_t *p = (uint32_t*)LocalAddress;
@@ -283,14 +283,14 @@ bool RuntimeDyldMachO::resolveARMRelocation(uint8_t *LocalAddress,
     *p = (*p & ~0xffffff) | Value;
     break;
   }
-  case MachO::ARM_THUMB_RELOC_BR22:
-  case MachO::ARM_THUMB_32BIT_BRANCH:
-  case MachO::ARM_RELOC_HALF:
-  case MachO::ARM_RELOC_HALF_SECTDIFF:
-  case MachO::ARM_RELOC_PAIR:
-  case MachO::ARM_RELOC_SECTDIFF:
-  case MachO::ARM_RELOC_LOCAL_SECTDIFF:
-  case MachO::ARM_RELOC_PB_LA_PTR:
+  case macho::RIT_ARM_ThumbBranch22Bit:
+  case macho::RIT_ARM_ThumbBranch32Bit:
+  case macho::RIT_ARM_Half:
+  case macho::RIT_ARM_HalfDifference:
+  case macho::RIT_Pair:
+  case macho::RIT_Difference:
+  case macho::RIT_ARM_LocalDifference:
+  case macho::RIT_ARM_PreboundLazyPointer:
     return Error("Relocation type not implemented yet!");
   }
   return false;
@@ -304,7 +304,7 @@ void RuntimeDyldMachO::processRelocationRef(unsigned SectionID,
                                             StubMap &Stubs) {
   const ObjectFile *OF = Obj.getObjectFile();
   const MachOObjectFile *MachO = static_cast<const MachOObjectFile*>(OF);
-  MachO::any_relocation_info RE= MachO->getRelocation(RelI.getRawDataRefImpl());
+  macho::RelocationEntry RE = MachO->getRelocation(RelI.getRawDataRefImpl());
 
   uint32_t RelType = MachO->getAnyRelocationType(RE);
 
@@ -359,8 +359,8 @@ void RuntimeDyldMachO::processRelocationRef(unsigned SectionID,
     Value.Addend = Addend - Addr;
   }
 
-  if (Arch == Triple::x86_64 && (RelType == MachO::X86_64_RELOC_GOT ||
-                                 RelType == MachO::X86_64_RELOC_GOT_LOAD)) {
+  if (Arch == Triple::x86_64 && (RelType == macho::RIT_X86_64_GOT ||
+                                 RelType == macho::RIT_X86_64_GOTLoad)) {
     assert(IsPCRel);
     assert(Size == 2);
     StubMap::const_iterator i = Stubs.find(Value);
@@ -371,7 +371,7 @@ void RuntimeDyldMachO::processRelocationRef(unsigned SectionID,
       Stubs[Value] = Section.StubOffset;
       uint8_t *GOTEntry = Section.Address + Section.StubOffset;
       RelocationEntry RE(SectionID, Section.StubOffset,
-                         MachO::X86_64_RELOC_UNSIGNED, 0, false, 3);
+                         macho::RIT_X86_64_Unsigned, 0, false, 3);
       if (Value.SymbolName)
         addRelocationForSymbol(RE, Value.SymbolName);
       else
@@ -380,9 +380,9 @@ void RuntimeDyldMachO::processRelocationRef(unsigned SectionID,
       Addr = GOTEntry;
     }
     resolveRelocation(Section, Offset, (uint64_t)Addr,
-                      MachO::X86_64_RELOC_UNSIGNED, Value.Addend, true, 2);
+                      macho::RIT_X86_64_Unsigned, Value.Addend, true, 2);
   } else if (Arch == Triple::arm &&
-             (RelType & 0xf) == MachO::ARM_RELOC_BR24) {
+             (RelType & 0xf) == macho::RIT_ARM_Branch24Bit) {
     // This is an ARM branch relocation, need to use a stub function.
 
     //  Look up for existing stub.
@@ -397,7 +397,7 @@ void RuntimeDyldMachO::processRelocationRef(unsigned SectionID,
       uint8_t *StubTargetAddr = createStubFunction(Section.Address +
                                                    Section.StubOffset);
       RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
-                         MachO::GENERIC_RELOC_VANILLA, Value.Addend);
+                         macho::RIT_Vanilla, Value.Addend);
       if (Value.SymbolName)
         addRelocationForSymbol(RE, Value.SymbolName);
       else
diff --git a/lib/MC/MCObjectDisassembler.cpp b/lib/MC/MCObjectDisassembler.cpp
index fa4663740d..ceebf0f864 100644
--- a/lib/MC/MCObjectDisassembler.cpp
+++ b/lib/MC/MCObjectDisassembler.cpp
@@ -537,10 +537,10 @@ uint64_t MCMachOObjectDisassembler::getEntrypoint() {
 
   // Look for LC_MAIN.
   {
-    uint32_t LoadCommandCount = MOOF.getHeader().ncmds;
+    uint32_t LoadCommandCount = MOOF.getHeader().NumLoadCommands;
     MachOObjectFile::LoadCommandInfo Load = MOOF.getFirstLoadCommandInfo();
     for (unsigned I = 0;; ++I) {
-      if (Load.C.cmd == MachO::LC_MAIN) {
+      if (Load.C.Type == MachO::LC_MAIN) {
         EntryFileOffset =
             ((const MachO::entry_point_command *)Load.Ptr)->entryoff;
         break;
diff --git a/lib/MC/MCObjectSymbolizer.cpp b/lib/MC/MCObjectSymbolizer.cpp
index b9131d1ed6..a32e2aeb82 100644
--- a/lib/MC/MCObjectSymbolizer.cpp
+++ b/lib/MC/MCObjectSymbolizer.cpp
@@ -60,13 +60,13 @@ MCMachObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo,
     if (Name == "__stubs") {
       SectionRef StubsSec = *SI;
       if (MOOF->is64Bit()) {
-        MachO::section_64 S = MOOF->getSection64(StubsSec.getRawDataRefImpl());
-        StubsIndSymIndex = S.reserved1;
-        StubSize = S.reserved2;
+        macho::Section64 S = MOOF->getSection64(StubsSec.getRawDataRefImpl());
+        StubsIndSymIndex = S.Reserved1;
+        StubSize = S.Reserved2;
       } else {
-        MachO::section S = MOOF->getSection(StubsSec.getRawDataRefImpl());
-        StubsIndSymIndex = S.reserved1;
-        StubSize = S.reserved2;
+        macho::Section S = MOOF->getSection(StubsSec.getRawDataRefImpl());
+        StubsIndSymIndex = S.Reserved1;
+        StubSize = S.Reserved2;
       }
       assert(StubSize && "Mach-O stub entry size can't be zero!");
       StubsSec.getAddress(StubsStart);
@@ -86,8 +86,9 @@ StringRef MCMachObjectSymbolizer::findExternalFunctionAt(uint64_t Addr) {
   if (StubIdx >= StubsCount)
     return StringRef();
 
-  uint32_t SymtabIdx =
+  macho::IndirectSymbolTableEntry ISTE =
     MOOF->getIndirectSymbolTableEntry(MOOF->getDysymtabLoadCommand(), StubIdx);
+  uint32_t SymtabIdx = ISTE.Index;
 
   StringRef SymName;
   symbol_iterator SI = MOOF->begin_symbols();
diff --git a/lib/MC/MachObjectWriter.cpp b/lib/MC/MachObjectWriter.cpp
index 8d5aeee3a5..a5ba3c3653 100644
--- a/lib/MC/MachObjectWriter.cpp
+++ b/lib/MC/MachObjectWriter.cpp
@@ -20,11 +20,12 @@
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/MCValue.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MachO.h"
 #include <vector>
 using namespace llvm;
+using namespace llvm::object;
 
 void MachObjectWriter::reset() {
   Relocations.clear();
@@ -127,7 +128,7 @@ void MachObjectWriter::WriteHeader(unsigned NumLoadCommands,
   uint32_t Flags = 0;
 
   if (SubsectionsViaSymbols)
-    Flags |= MachO::MH_SUBSECTIONS_VIA_SYMBOLS;
+    Flags |= macho::HF_SubsectionsViaSymbols;
 
   // struct mach_header (28 bytes) or
   // struct mach_header_64 (32 bytes)
@@ -135,12 +136,12 @@ void MachObjectWriter::WriteHeader(unsigned NumLoadCommands,
   uint64_t Start = OS.tell();
   (void) Start;
 
-  Write32(is64Bit() ? MachO::MH_MAGIC_64 : MachO::MH_MAGIC);
+  Write32(is64Bit() ? macho::HM_Object64 : macho::HM_Object32);
 
   Write32(TargetObjectWriter->getCPUType());
   Write32(TargetObjectWriter->getCPUSubtype());
 
-  Write32(MachO::MH_OBJECT);
+  Write32(macho::HFT_Object);
   Write32(NumLoadCommands);
   Write32(LoadCommandsSize);
   Write32(Flags);
@@ -148,7 +149,7 @@ void MachObjectWriter::WriteHeader(unsigned NumLoadCommands,
     Write32(0); // reserved
 
   assert(OS.tell() - Start ==
-         (is64Bit()?sizeof(MachO::mach_header_64): sizeof(MachO::mach_header)));
+         (is64Bit() ? macho::Header64Size : macho::Header32Size));
 }
 
 /// WriteSegmentLoadCommand - Write a segment load command.
@@ -166,12 +167,12 @@ void MachObjectWriter::WriteSegmentLoadCommand(unsigned NumSections,
   (void) Start;
 
   unsigned SegmentLoadCommandSize =
-    is64Bit() ? sizeof(MachO::segment_command_64):
-    sizeof(MachO::segment_command);
-  Write32(is64Bit() ? MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT);
+    is64Bit() ? macho::SegmentLoadCommand64Size:
+    macho::SegmentLoadCommand32Size;
+  Write32(is64Bit() ? macho::LCT_Segment64 : macho::LCT_Segment);
   Write32(SegmentLoadCommandSize +
-          NumSections * (is64Bit() ? sizeof(MachO::section_64) :
-                         sizeof(MachO::section)));
+          NumSections * (is64Bit() ? macho::Section64Size :
+                         macho::Section32Size));
 
   WriteBytes("", 16);
   if (is64Bit()) {
@@ -239,8 +240,8 @@ void MachObjectWriter::WriteSection(const MCAssembler &Asm,
   if (is64Bit())
     Write32(0); // reserved3
 
-  assert(OS.tell() - Start == (is64Bit() ? sizeof(MachO::section_64) :
-                               sizeof(MachO::section)));
+  assert(OS.tell() - Start == (is64Bit() ? macho::Section64Size :
+                               macho::Section32Size));
 }
 
 void MachObjectWriter::WriteSymtabLoadCommand(uint32_t SymbolOffset,
@@ -252,14 +253,14 @@ void MachObjectWriter::WriteSymtabLoadCommand(uint32_t SymbolOffset,
   uint64_t Start = OS.tell();
   (void) Start;
 
-  Write32(MachO::LC_SYMTAB);
-  Write32(sizeof(MachO::symtab_command));
+  Write32(macho::LCT_Symtab);
+  Write32(macho::SymtabLoadCommandSize);
   Write32(SymbolOffset);
   Write32(NumSymbols);
   Write32(StringTableOffset);
   Write32(StringTableSize);
 
-  assert(OS.tell() - Start == sizeof(MachO::symtab_command));
+  assert(OS.tell() - Start == macho::SymtabLoadCommandSize);
 }
 
 void MachObjectWriter::WriteDysymtabLoadCommand(uint32_t FirstLocalSymbol,
@@ -275,8 +276,8 @@ void MachObjectWriter::WriteDysymtabLoadCommand(uint32_t FirstLocalSymbol,
   uint64_t Start = OS.tell();
   (void) Start;
 
-  Write32(MachO::LC_DYSYMTAB);
-  Write32(sizeof(MachO::dysymtab_command));
+  Write32(macho::LCT_Dysymtab);
+  Write32(macho::DysymtabLoadCommandSize);
   Write32(FirstLocalSymbol);
   Write32(NumLocalSymbols);
   Write32(FirstExternalSymbol);
@@ -296,7 +297,7 @@ void MachObjectWriter::WriteDysymtabLoadCommand(uint32_t FirstLocalSymbol,
   Write32(0); // locreloff
   Write32(0); // nlocrel
 
-  assert(OS.tell() - Start == sizeof(MachO::dysymtab_command));
+  assert(OS.tell() - Start == macho::DysymtabLoadCommandSize);
 }
 
 void MachObjectWriter::WriteNlist(MachSymbolData &MSD,
@@ -311,20 +312,20 @@ void MachObjectWriter::WriteNlist(MachSymbolData &MSD,
   //
   // FIXME: Are the prebound or indirect fields possible here?
   if (Symbol.isUndefined())
-    Type = MachO::N_UNDF;
+    Type = macho::STT_Undefined;
   else if (Symbol.isAbsolute())
-    Type = MachO::N_ABS;
+    Type = macho::STT_Absolute;
   else
-    Type = MachO::N_SECT;
+    Type = macho::STT_Section;
 
   // FIXME: Set STAB bits.
 
   if (Data.isPrivateExtern())
-    Type |= MachO::N_PEXT;
+    Type |= macho::STF_PrivateExtern;
 
   // Set external bit.
   if (Data.isExternal() || Symbol.isUndefined())
-    Type |= MachO::N_EXT;
+    Type |= macho::STF_External;
 
   // Compute the symbol address.
   if (Symbol.isDefined()) {
@@ -368,17 +369,17 @@ void MachObjectWriter::WriteLinkeditLoadCommand(uint32_t Type,
   (void) Start;
 
   Write32(Type);
-  Write32(sizeof(MachO::linkedit_data_command));
+  Write32(macho::LinkeditLoadCommandSize);
   Write32(DataOffset);
   Write32(DataSize);
 
-  assert(OS.tell() - Start == sizeof(MachO::linkedit_data_command));
+  assert(OS.tell() - Start == macho::LinkeditLoadCommandSize);
 }
 
 static unsigned ComputeLinkerOptionsLoadCommandSize(
   const std::vector<std::string> &Options, bool is64Bit)
 {
-  unsigned Size = sizeof(MachO::linker_options_command);
+  unsigned Size = sizeof(macho::LinkerOptionsLoadCommand);
   for (unsigned i = 0, e = Options.size(); i != e; ++i)
     Size += Options[i].size() + 1;
   return RoundUpToAlignment(Size, is64Bit ? 8 : 4);
@@ -391,10 +392,10 @@ void MachObjectWriter::WriteLinkerOptionsLoadCommand(
   uint64_t Start = OS.tell();
   (void) Start;
 
-  Write32(MachO::LC_LINKER_OPTIONS);
+  Write32(macho::LCT_LinkerOptions);
   Write32(Size);
   Write32(Options.size());
-  uint64_t BytesWritten = sizeof(MachO::linker_options_command);
+  uint64_t BytesWritten = sizeof(macho::LinkerOptionsLoadCommand);
   for (unsigned i = 0, e = Options.size(); i != e; ++i) {
     // Write each string, including the null byte.
     const std::string &Option = Options[i];
@@ -722,14 +723,14 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
   // section headers) and the symbol table.
   unsigned NumLoadCommands = 1;
   uint64_t LoadCommandsSize = is64Bit() ?
-    sizeof(MachO::segment_command_64) + NumSections * sizeof(MachO::section_64):
-    sizeof(MachO::segment_command) + NumSections * sizeof(MachO::section);
+    macho::SegmentLoadCommand64Size + NumSections * macho::Section64Size :
+    macho::SegmentLoadCommand32Size + NumSections * macho::Section32Size;
 
   // Add the data-in-code load command size, if used.
   unsigned NumDataRegions = Asm.getDataRegions().size();
   if (NumDataRegions) {
     ++NumLoadCommands;
-    LoadCommandsSize += sizeof(MachO::linkedit_data_command);
+    LoadCommandsSize += macho::LinkeditLoadCommandSize;
   }
 
   // Add the symbol table load command sizes, if used.
@@ -737,8 +738,8 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
     UndefinedSymbolData.size();
   if (NumSymbols) {
     NumLoadCommands += 2;
-    LoadCommandsSize += (sizeof(MachO::symtab_command) +
-                         sizeof(MachO::dysymtab_command));
+    LoadCommandsSize += (macho::SymtabLoadCommandSize +
+                         macho::DysymtabLoadCommandSize);
   }
 
   // Add the linker option load commands sizes.
@@ -752,8 +753,8 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
   
   // Compute the total size of the section data, as well as its file size and vm
   // size.
-  uint64_t SectionDataStart = (is64Bit() ? sizeof(MachO::mach_header_64) :
-                               sizeof(MachO::mach_header)) + LoadCommandsSize;
+  uint64_t SectionDataStart = (is64Bit() ? macho::Header64Size :
+                               macho::Header32Size) + LoadCommandsSize;
   uint64_t SectionDataSize = 0;
   uint64_t SectionDataFileSize = 0;
   uint64_t VMSize = 0;
@@ -790,11 +791,11 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
   uint64_t RelocTableEnd = SectionDataStart + SectionDataFileSize;
   for (MCAssembler::const_iterator it = Asm.begin(),
          ie = Asm.end(); it != ie; ++it) {
-    std::vector<MachO::any_relocation_info> &Relocs = Relocations[it];
+    std::vector<macho::RelocationEntry> &Relocs = Relocations[it];
     unsigned NumRelocs = Relocs.size();
     uint64_t SectionStart = SectionDataStart + getSectionAddress(it);
     WriteSection(Asm, Layout, *it, SectionStart, RelocTableEnd, NumRelocs);
-    RelocTableEnd += NumRelocs * sizeof(MachO::any_relocation_info);
+    RelocTableEnd += NumRelocs * macho::RelocationInfoSize;
   }
 
   // Write the data-in-code load command, if used.
@@ -802,7 +803,7 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
   if (NumDataRegions) {
     uint64_t DataRegionsOffset = RelocTableEnd;
     uint64_t DataRegionsSize = NumDataRegions * 8;
-    WriteLinkeditLoadCommand(MachO::LC_DATA_IN_CODE, DataRegionsOffset,
+    WriteLinkeditLoadCommand(macho::LCT_DataInCode, DataRegionsOffset,
                              DataRegionsSize);
   }
 
@@ -829,9 +830,8 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
 
     // The string table is written after symbol table.
     uint64_t StringTableOffset =
-      SymbolTableOffset + NumSymTabSymbols * (is64Bit() ?
-                                              sizeof(MachO::nlist_64) :
-                                              sizeof(MachO::nlist));
+      SymbolTableOffset + NumSymTabSymbols * (is64Bit() ? macho::Nlist64Size :
+                                              macho::Nlist32Size);
     WriteSymtabLoadCommand(SymbolTableOffset, NumSymTabSymbols,
                            StringTableOffset, StringTable.size());
 
@@ -864,10 +864,10 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
          ie = Asm.end(); it != ie; ++it) {
     // Write the section relocation entries, in reverse order to match 'as'
     // (approximately, the exact algorithm is more complicated than this).
-    std::vector<MachO::any_relocation_info> &Relocs = Relocations[it];
+    std::vector<macho::RelocationEntry> &Relocs = Relocations[it];
     for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
-      Write32(Relocs[e - i - 1].r_word0);
-      Write32(Relocs[e - i - 1].r_word1);
+      Write32(Relocs[e - i - 1].Word0);
+      Write32(Relocs[e - i - 1].Word1);
     }
   }
 
@@ -906,9 +906,9 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
         // If this symbol is defined and internal, mark it as such.
         if (it->Symbol->isDefined() &&
             !Asm.getSymbolData(*it->Symbol).isExternal()) {
-          uint32_t Flags = MachO::INDIRECT_SYMBOL_LOCAL;
+          uint32_t Flags = macho::ISF_Local;
           if (it->Symbol->isAbsolute())
-            Flags |= MachO::INDIRECT_SYMBOL_ABS;
+            Flags |= macho::ISF_Absolute;
           Write32(Flags);
           continue;
         }
diff --git a/lib/Object/MachOObjectFile.cpp b/lib/Object/MachOObjectFile.cpp
index 9df558c645..37d6c21833 100644
--- a/lib/Object/MachOObjectFile.cpp
+++ b/lib/Object/MachOObjectFile.cpp
@@ -14,9 +14,11 @@
 
 #include "llvm/Object/MachO.h"
 #include "llvm/ADT/Triple.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/DataExtractor.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/Host.h"
+#include "llvm/Support/MachO.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cctype>
@@ -29,16 +31,16 @@ using namespace object;
 namespace llvm {
 namespace object {
 
-struct nlist_base {
-  uint32_t n_strx;
-  uint8_t n_type;
-  uint8_t n_sect;
-  uint16_t n_desc;
+struct SymbolTableEntryBase {
+  uint32_t StringIndex;
+  uint8_t Type;
+  uint8_t SectionIndex;
+  uint16_t Flags;
 };
 
-struct section_base {
-  char sectname[16];
-  char segname[16];
+struct SectionBase {
+  char Name[16];
+  char SegmentName[16];
 };
 
 template<typename T>
@@ -50,174 +52,167 @@ template<typename T>
 static void SwapStruct(T &Value);
 
 template<>
-void SwapStruct(MachO::any_relocation_info &H) {
-  SwapValue(H.r_word0);
-  SwapValue(H.r_word1);
+void SwapStruct(macho::RelocationEntry &H) {
+  SwapValue(H.Word0);
+  SwapValue(H.Word1);
 }
 
 template<>
-void SwapStruct(MachO::load_command &L) {
-  SwapValue(L.cmd);
-  SwapValue(L.cmdsize);
+void SwapStruct(macho::LoadCommand &L) {
+  SwapValue(L.Type);
+  SwapValue(L.Size);
 }
 
 template<>
-void SwapStruct(nlist_base &S) {
-  SwapValue(S.n_strx);
-  SwapValue(S.n_desc);
+void SwapStruct(SymbolTableEntryBase &S) {
+  SwapValue(S.StringIndex);
+  SwapValue(S.Flags);
 }
 
 template<>
-void SwapStruct(MachO::section &S) {
-  SwapValue(S.addr);
-  SwapValue(S.size);
-  SwapValue(S.offset);
-  SwapValue(S.align);
-  SwapValue(S.reloff);
-  SwapValue(S.nreloc);
-  SwapValue(S.flags);
-  SwapValue(S.reserved1);
-  SwapValue(S.reserved2);
+void SwapStruct(macho::Section &S) {
+  SwapValue(S.Address);
+  SwapValue(S.Size);
+  SwapValue(S.Offset);
+  SwapValue(S.Align);
+  SwapValue(S.RelocationTableOffset);
+  SwapValue(S.NumRelocationTableEntries);
+  SwapValue(S.Flags);
+  SwapValue(S.Reserved1);
+  SwapValue(S.Reserved2);
 }
 
 template<>
-void SwapStruct(MachO::section_64 &S) {
-  SwapValue(S.addr);
-  SwapValue(S.size);
-  SwapValue(S.offset);
-  SwapValue(S.align);
-  SwapValue(S.reloff);
-  SwapValue(S.nreloc);
-  SwapValue(S.flags);
-  SwapValue(S.reserved1);
-  SwapValue(S.reserved2);
-  SwapValue(S.reserved3);
+void SwapStruct(macho::Section64 &S) {
+  SwapValue(S.Address);
+  SwapValue(S.Size);
+  SwapValue(S.Offset);
+  SwapValue(S.Align);
+  SwapValue(S.RelocationTableOffset);
+  SwapValue(S.NumRelocationTableEntries);
+  SwapValue(S.Flags);
+  SwapValue(S.Reserved1);
+  SwapValue(S.Reserved2);
+  SwapValue(S.Reserved3);
 }
 
 template<>
-void SwapStruct(MachO::nlist &S) {
-  SwapValue(S.n_strx);
-  SwapValue(S.n_desc);
-  SwapValue(S.n_value);
+void SwapStruct(macho::SymbolTableEntry &S) {
+  SwapValue(S.StringIndex);
+  SwapValue(S.Flags);
+  SwapValue(S.Value);
 }
 
 template<>
-void SwapStruct(MachO::nlist_64 &S) {
-  SwapValue(S.n_strx);
-  SwapValue(S.n_desc);
-  SwapValue(S.n_value);
+void SwapStruct(macho::Symbol64TableEntry &S) {
+  SwapValue(S.StringIndex);
+  SwapValue(S.Flags);
+  SwapValue(S.Value);
 }
 
 template<>
-void SwapStruct(MachO::mach_header &H) {
-  SwapValue(H.magic);
-  SwapValue(H.cputype);
-  SwapValue(H.cpusubtype);
-  SwapValue(H.filetype);
-  SwapValue(H.ncmds);
-  SwapValue(H.sizeofcmds);
-  SwapValue(H.flags);
+void SwapStruct(macho::Header &H) {
+  SwapValue(H.Magic);
+  SwapValue(H.CPUType);
+  SwapValue(H.CPUSubtype);
+  SwapValue(H.FileType);
+  SwapValue(H.NumLoadCommands);
+  SwapValue(H.SizeOfLoadCommands);
+  SwapValue(H.Flags);
 }
 
 template<>
-void SwapStruct(MachO::mach_header_64 &H) {
-  SwapValue(H.magic);
-  SwapValue(H.cputype);
-  SwapValue(H.cpusubtype);
-  SwapValue(H.filetype);
-  SwapValue(H.ncmds);
-  SwapValue(H.sizeofcmds);
-  SwapValue(H.flags);
-  SwapValue(H.reserved);
+void SwapStruct(macho::Header64Ext &E) {
+  SwapValue(E.Reserved);
 }
 
 template<>
-void SwapStruct(MachO::symtab_command &C) {
-  SwapValue(C.cmd);
-  SwapValue(C.cmdsize);
-  SwapValue(C.symoff);
-  SwapValue(C.nsyms);
-  SwapValue(C.stroff);
-  SwapValue(C.strsize);
+void SwapStruct(macho::SymtabLoadCommand &C) {
+  SwapValue(C.Type);
+  SwapValue(C.Size);
+  SwapValue(C.SymbolTableOffset);
+  SwapValue(C.NumSymbolTableEntries);
+  SwapValue(C.StringTableOffset);
+  SwapValue(C.StringTableSize);
 }
 
 template<>
-void SwapStruct(MachO::dysymtab_command &C) {
-  SwapValue(C.cmd);
-  SwapValue(C.cmdsize);
-  SwapValue(C.ilocalsym);
-  SwapValue(C.nlocalsym);
-  SwapValue(C.iextdefsym);
-  SwapValue(C.nextdefsym);
-  SwapValue(C.iundefsym);
-  SwapValue(C.nundefsym);
-  SwapValue(C.tocoff);
-  SwapValue(C.ntoc);
-  SwapValue(C.modtaboff);
-  SwapValue(C.nmodtab);
-  SwapValue(C.extrefsymoff);
-  SwapValue(C.nextrefsyms);
-  SwapValue(C.indirectsymoff);
-  SwapValue(C.nindirectsyms);
-  SwapValue(C.extreloff);
-  SwapValue(C.nextrel);
-  SwapValue(C.locreloff);
-  SwapValue(C.nlocrel);
+void SwapStruct(macho::DysymtabLoadCommand &C) {
+  SwapValue(C.Type);
+  SwapValue(C.Size);
+  SwapValue(C.LocalSymbolsIndex);
+  SwapValue(C.NumLocalSymbols);
+  SwapValue(C.ExternalSymbolsIndex);
+  SwapValue(C.NumExternalSymbols);
+  SwapValue(C.UndefinedSymbolsIndex);
+  SwapValue(C.NumUndefinedSymbols);
+  SwapValue(C.TOCOffset);
+  SwapValue(C.NumTOCEntries);
+  SwapValue(C.ModuleTableOffset);
+  SwapValue(C.NumModuleTableEntries);
+  SwapValue(C.ReferenceSymbolTableOffset);
+  SwapValue(C.NumReferencedSymbolTableEntries);
+  SwapValue(C.IndirectSymbolTableOffset);
+  SwapValue(C.NumIndirectSymbolTableEntries);
+  SwapValue(C.ExternalRelocationTableOffset);
+  SwapValue(C.NumExternalRelocationTableEntries);
+  SwapValue(C.LocalRelocationTableOffset);
+  SwapValue(C.NumLocalRelocationTableEntries);
 }
 
 template<>
-void SwapStruct(MachO::linkedit_data_command &C) {
-  SwapValue(C.cmd);
-  SwapValue(C.cmdsize);
-  SwapValue(C.dataoff);
-  SwapValue(C.datasize);
+void SwapStruct(macho::LinkeditDataLoadCommand &C) {
+  SwapValue(C.Type);
+  SwapValue(C.Size);
+  SwapValue(C.DataOffset);
+  SwapValue(C.DataSize);
 }
 
 template<>
-void SwapStruct(MachO::segment_command &C) {
-  SwapValue(C.cmd);
-  SwapValue(C.cmdsize);
-  SwapValue(C.vmaddr);
-  SwapValue(C.vmsize);
-  SwapValue(C.fileoff);
-  SwapValue(C.filesize);
-  SwapValue(C.maxprot);
-  SwapValue(C.initprot);
-  SwapValue(C.nsects);
-  SwapValue(C.flags);
+void SwapStruct(macho::SegmentLoadCommand &C) {
+  SwapValue(C.Type);
+  SwapValue(C.Size);
+  SwapValue(C.VMAddress);
+  SwapValue(C.VMSize);
+  SwapValue(C.FileOffset);
+  SwapValue(C.FileSize);
+  SwapValue(C.MaxVMProtection);
+  SwapValue(C.InitialVMProtection);
+  SwapValue(C.NumSections);
+  SwapValue(C.Flags);
 }
 
 template<>
-void SwapStruct(MachO::segment_command_64 &C) {
-  SwapValue(C.cmd);
-  SwapValue(C.cmdsize);
-  SwapValue(C.vmaddr);
-  SwapValue(C.vmsize);
-  SwapValue(C.fileoff);
-  SwapValue(C.filesize);
-  SwapValue(C.maxprot);
-  SwapValue(C.initprot);
-  SwapValue(C.nsects);
-  SwapValue(C.flags);
+void SwapStruct(macho::Segment64LoadCommand &C) {
+  SwapValue(C.Type);
+  SwapValue(C.Size);
+  SwapValue(C.VMAddress);
+  SwapValue(C.VMSize);
+  SwapValue(C.FileOffset);
+  SwapValue(C.FileSize);
+  SwapValue(C.MaxVMProtection);
+  SwapValue(C.InitialVMProtection);
+  SwapValue(C.NumSections);
+  SwapValue(C.Flags);
 }
 
 template<>
-void SwapStruct(uint32_t &C) {
-  SwapValue(C);
+void SwapStruct(macho::IndirectSymbolTableEntry &C) {
+  SwapValue(C.Index);
 }
 
 template<>
-void SwapStruct(MachO::linker_options_command &C) {
-  SwapValue(C.cmd);
-  SwapValue(C.cmdsize);
-  SwapValue(C.count);
+void SwapStruct(macho::LinkerOptionsLoadCommand &C) {
+  SwapValue(C.Type);
+  SwapValue(C.Size);
+  SwapValue(C.Count);
 }
 
 template<>
-void SwapStruct(MachO::data_in_code_entry &C) {
-  SwapValue(C.offset);
-  SwapValue(C.length);
-  SwapValue(C.kind);
+void SwapStruct(macho::DataInCodeTableEntry &C) {
+  SwapValue(C.Offset);
+  SwapValue(C.Length);
+  SwapValue(C.Kind);
 }
 
 template<typename T>
@@ -233,11 +228,11 @@ static uint32_t
 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
                                  const MachOObjectFile::LoadCommandInfo &L) {
   if (O->is64Bit()) {
-    MachO::segment_command_64 S = O->getSegment64LoadCommand(L);
-    return S.nsects;
+    macho::Segment64LoadCommand S = O->getSegment64LoadCommand(L);
+    return S.NumSections;
   }
-  MachO::segment_command S = O->getSegmentLoadCommand(L);
-  return S.nsects;
+  macho::SegmentLoadCommand S = O->getSegmentLoadCommand(L);
+  return S.NumSections;
 }
 
 static const char *
@@ -246,23 +241,23 @@ getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
   uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
 
   bool Is64 = O->is64Bit();
-  unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
-                                    sizeof(MachO::segment_command);
-  unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
-                                sizeof(MachO::section);
+  unsigned SegmentLoadSize = Is64 ? sizeof(macho::Segment64LoadCommand) :
+                                    sizeof(macho::SegmentLoadCommand);
+  unsigned SectionSize = Is64 ? sizeof(macho::Section64) :
+                                sizeof(macho::Section);
 
   uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
-  return reinterpret_cast<const char *>(SectionAddr);
+  return reinterpret_cast<const char*>(SectionAddr);
 }
 
 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
   return O->getData().substr(Offset, 1).data();
 }
 
-static nlist_base
+static SymbolTableEntryBase
 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
   const char *P = reinterpret_cast<const char *>(DRI.p);
-  return getStruct<nlist_base>(O, P);
+  return getStruct<SymbolTableEntryBase>(O, P);
 }
 
 static StringRef parseSegmentOrSectionName(const char *P) {
@@ -290,11 +285,11 @@ static void advanceTo(T &it, size_t Val) {
 }
 
 static unsigned getCPUType(const MachOObjectFile *O) {
-  return O->getHeader().cputype;
+  return O->getHeader().CPUType;
 }
 
 static void printRelocationTargetName(const MachOObjectFile *O,
-                                      const MachO::any_relocation_info &RE,
+                                      const macho::RelocationEntry &RE,
                                       raw_string_ostream &fmt) {
   bool IsScattered = O->isRelocationScattered(RE);
 
@@ -362,61 +357,59 @@ static void printRelocationTargetName(const MachOObjectFile *O,
   fmt << S;
 }
 
-static uint32_t
-getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
-  return RE.r_word0;
+static uint32_t getPlainRelocationAddress(const macho::RelocationEntry &RE) {
+  return RE.Word0;
 }
 
 static unsigned
-getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
-  return RE.r_word0 & 0xffffff;
+getScatteredRelocationAddress(const macho::RelocationEntry &RE) {
+  return RE.Word0 & 0xffffff;
 }
 
 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
-                                    const MachO::any_relocation_info &RE) {
+                                    const macho::RelocationEntry &RE) {
   if (O->isLittleEndian())
-    return (RE.r_word1 >> 24) & 1;
-  return (RE.r_word1 >> 7) & 1;
+    return (RE.Word1 >> 24) & 1;
+  return (RE.Word1 >> 7) & 1;
 }
 
 static bool
 getScatteredRelocationPCRel(const MachOObjectFile *O,
-                            const MachO::any_relocation_info &RE) {
-  return (RE.r_word0 >> 30) & 1;
+                            const macho::RelocationEntry &RE) {
+  return (RE.Word0 >> 30) & 1;
 }
 
 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
-                                         const MachO::any_relocation_info &RE) {
+                                         const macho::RelocationEntry &RE) {
   if (O->isLittleEndian())
-    return (RE.r_word1 >> 25) & 3;
-  return (RE.r_word1 >> 5) & 3;
+    return (RE.Word1 >> 25) & 3;
+  return (RE.Word1 >> 5) & 3;
 }
 
 static unsigned
-getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
-  return (RE.r_word0 >> 28) & 3;
+getScatteredRelocationLength(const macho::RelocationEntry &RE) {
+  return (RE.Word0 >> 28) & 3;
 }
 
 static unsigned getPlainRelocationType(const MachOObjectFile *O,
-                                       const MachO::any_relocation_info &RE) {
+                                       const macho::RelocationEntry &RE) {
   if (O->isLittleEndian())
-    return RE.r_word1 >> 28;
-  return RE.r_word1 & 0xf;
+    return RE.Word1 >> 28;
+  return RE.Word1 & 0xf;
 }
 
-static unsigned
-getScatteredRelocationType(const MachO::any_relocation_info &RE) {
-  return (RE.r_word0 >> 24) & 0xf;
+static unsigned getScatteredRelocationType(const macho::RelocationEntry &RE) {
+  return (RE.Word0 >> 24) & 0xf;
 }
 
 static uint32_t getSectionFlags(const MachOObjectFile *O,
                                 DataRefImpl Sec) {
   if (O->is64Bit()) {
-    MachO::section_64 Sect = O->getSection64(Sec);
-    return Sect.flags;
+    macho::Section64 Sect = O->getSection64(Sec);
+    return Sect.Flags;
   }
-  MachO::section Sect = O->getSection(Sec);
-  return Sect.flags;
+  macho::Section Sect = O->getSection(Sec);
+  return Sect.Flags;
 }
 
 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
@@ -424,22 +417,22 @@ MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
                                  error_code &ec)
     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
       SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
-  uint32_t LoadCommandCount = this->getHeader().ncmds;
-  MachO::LoadCommandType SegmentLoadType = is64Bit() ?
-    MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
+  uint32_t LoadCommandCount = this->getHeader().NumLoadCommands;
+  macho::LoadCommandType SegmentLoadType = is64Bit() ?
+    macho::LCT_Segment64 : macho::LCT_Segment;
 
   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
   for (unsigned I = 0; ; ++I) {
-    if (Load.C.cmd == MachO::LC_SYMTAB) {
+    if (Load.C.Type == macho::LCT_Symtab) {
       assert(!SymtabLoadCmd && "Multiple symbol tables");
       SymtabLoadCmd = Load.Ptr;
-    } else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
+    } else if (Load.C.Type == macho::LCT_Dysymtab) {
       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
       DysymtabLoadCmd = Load.Ptr;
-    } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
+    } else if (Load.C.Type == macho::LCT_DataInCode) {
       assert(!DataInCodeLoadCmd && "Multiple data in code tables");
       DataInCodeLoadCmd = Load.Ptr;
-    } else if (Load.C.cmd == SegmentLoadType) {
+    } else if (Load.C.Type == SegmentLoadType) {
       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
       for (unsigned J = 0; J < NumSections; ++J) {
         const char *Sec = getSectionPtr(this, Load, J);
@@ -457,8 +450,8 @@ MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
 error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
                                           SymbolRef &Res) const {
   unsigned SymbolTableEntrySize = is64Bit() ?
-    sizeof(MachO::nlist_64) :
-    sizeof(MachO::nlist);
+    sizeof(macho::Symbol64TableEntry) :
+    sizeof(macho::SymbolTableEntry);
   Symb.p += SymbolTableEntrySize;
   Res = SymbolRef(Symb, this);
   return object_error::success;
@@ -467,8 +460,8 @@ error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
                                           StringRef &Res) const {
   StringRef StringTable = getStringTableData();
-  nlist_base Entry = getSymbolTableEntryBase(this, Symb);
-  const char *Start = &StringTable.data()[Entry.n_strx];
+  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
+  const char *Start = &StringTable.data()[Entry.StringIndex];
   Res = StringRef(Start);
   return object_error::success;
 }
@@ -476,11 +469,11 @@ error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
                                              uint64_t &Res) const {
   if (is64Bit()) {
-    MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
-    Res = Entry.n_value;
+    macho::Symbol64TableEntry Entry = getSymbol64TableEntry(Symb);
+    Res = Entry.Value;
   } else {
-    MachO::nlist Entry = getSymbolTableEntry(Symb);
-    Res = Entry.n_value;
+    macho::SymbolTableEntry Entry = getSymbolTableEntry(Symb);
+    Res = Entry.Value;
   }
   return object_error::success;
 }
@@ -488,18 +481,18 @@ error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
 error_code
 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
                                      uint64_t &Res) const {
-  nlist_base Entry = getSymbolTableEntryBase(this, Symb);
+  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
   getSymbolAddress(Symb, Res);
-  if (Entry.n_sect) {
+  if (Entry.SectionIndex) {
     uint64_t Delta;
     DataRefImpl SecRel;
-    SecRel.d.a = Entry.n_sect-1;
+    SecRel.d.a = Entry.SectionIndex-1;
     if (is64Bit()) {
-      MachO::section_64 Sec = getSection64(SecRel);
-      Delta = Sec.offset - Sec.addr;
+      macho::Section64 Sec = getSection64(SecRel);
+      Delta = Sec.Offset - Sec.Address;
     } else {
-      MachO::section Sec = getSection(SecRel);
-      Delta = Sec.offset - Sec.addr;
+      macho::Section Sec = getSection(SecRel);
+      Delta = Sec.Offset - Sec.Address;
     }
 
     Res += Delta;
@@ -513,8 +506,8 @@ error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
   uint32_t flags;
   this->getSymbolFlags(DRI, flags);
   if (flags & SymbolRef::SF_Common) {
-    nlist_base Entry = getSymbolTableEntryBase(this, DRI);
-    Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
+    SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
+    Result = 1 << MachO::GET_COMM_ALIGN(Entry.Flags);
   } else {
     Result = 0;
   }
@@ -527,13 +520,13 @@ error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
   uint64_t EndOffset = 0;
   uint8_t SectionIndex;
 
-  nlist_base Entry = getSymbolTableEntryBase(this, DRI);
+  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
   uint64_t Value;
   getSymbolAddress(DRI, Value);
 
   BeginOffset = Value;
 
-  SectionIndex = Entry.n_sect;
+  SectionIndex = Entry.SectionIndex;
   if (!SectionIndex) {
     uint32_t flags = SymbolRef::SF_None;
     this->getSymbolFlags(DRI, flags);
@@ -551,7 +544,7 @@ error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
     DataRefImpl DRI = I->getRawDataRefImpl();
     Entry = getSymbolTableEntryBase(this, DRI);
     getSymbolAddress(DRI, Value);
-    if (Entry.n_sect == SectionIndex && Value > BeginOffset)
+    if (Entry.SectionIndex == SectionIndex && Value > BeginOffset)
       if (!EndOffset || Value < EndOffset)
         EndOffset = Value;
   }
@@ -569,8 +562,8 @@ error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
 
 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
                                           SymbolRef::Type &Res) const {
-  nlist_base Entry = getSymbolTableEntryBase(this, Symb);
-  uint8_t n_type = Entry.n_type;
+  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
+  uint8_t n_type = Entry.Type;
 
   Res = SymbolRef::ST_Other;
 
@@ -593,17 +586,17 @@ error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
 
 error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
                                                 char &Res) const {
-  nlist_base Entry = getSymbolTableEntryBase(this, Symb);
-  uint8_t Type = Entry.n_type;
-  uint16_t Flags = Entry.n_desc;
+  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
+  uint8_t Type = Entry.Type;
+  uint16_t Flags = Entry.Flags;
 
   char Char;
-  switch (Type & MachO::N_TYPE) {
-    case MachO::N_UNDF:
+  switch (Type & macho::STF_TypeMask) {
+    case macho::STT_Undefined:
       Char = 'u';
       break;
-    case MachO::N_ABS:
-    case MachO::N_SECT:
+    case macho::STT_Absolute:
+    case macho::STT_Section:
       Char = 's';
       break;
     default:
@@ -611,7 +604,7 @@ error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
       break;
   }
 
-  if (Flags & (MachO::N_EXT | MachO::N_PEXT))
+  if (Flags & (macho::STF_External | macho::STF_PrivateExtern))
     Char = toupper(static_cast<unsigned char>(Char));
   Res = Char;
   return object_error::success;
@@ -619,10 +612,10 @@ error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
 
 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
                                            uint32_t &Result) const {
-  nlist_base Entry = getSymbolTableEntryBase(this, DRI);
+  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
 
-  uint8_t MachOType = Entry.n_type;
-  uint16_t MachOFlags = Entry.n_desc;
+  uint8_t MachOType = Entry.Type;
+  uint16_t MachOFlags = Entry.Flags;
 
   // TODO: Correctly set SF_ThreadLocal
   Result = SymbolRef::SF_None;
@@ -630,7 +623,7 @@ error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
   if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
     Result |= SymbolRef::SF_Undefined;
 
-  if (MachOFlags & MachO::N_STAB)
+  if (MachOFlags & macho::STF_StabsEntryMask)
     Result |= SymbolRef::SF_FormatSpecific;
 
   if (MachOType & MachO::N_EXT) {
@@ -655,8 +648,8 @@ error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
 error_code
 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
                                   section_iterator &Res) const {
-  nlist_base Entry = getSymbolTableEntryBase(this, Symb);
-  uint8_t index = Entry.n_sect;
+  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
+  uint8_t index = Entry.SectionIndex;
 
   if (index == 0) {
     Res = end_sections();
@@ -691,11 +684,11 @@ MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
 error_code
 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
   if (is64Bit()) {
-    MachO::section_64 Sect = getSection64(Sec);
-    Res = Sect.addr;
+    macho::Section64 Sect = getSection64(Sec);
+    Res = Sect.Address;
   } else {
-    MachO::section Sect = getSection(Sec);
-    Res = Sect.addr;
+    macho::Section Sect = getSection(Sec);
+    Res = Sect.Address;
   }
   return object_error::success;
 }
@@ -703,11 +696,11 @@ MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
 error_code
 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
   if (is64Bit()) {
-    MachO::section_64 Sect = getSection64(Sec);
-    Res = Sect.size;
+    macho::Section64 Sect = getSection64(Sec);
+    Res = Sect.Size;
   } else {
-    MachO::section Sect = getSection(Sec);
-    Res = Sect.size;
+    macho::Section Sect = getSection(Sec);
+    Res = Sect.Size;
   }
 
   return object_error::success;
@@ -719,13 +712,13 @@ MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
   uint64_t Size;
 
   if (is64Bit()) {
-    MachO::section_64 Sect = getSection64(Sec);
-    Offset = Sect.offset;
-    Size = Sect.size;
+    macho::Section64 Sect = getSection64(Sec);
+    Offset = Sect.Offset;
+    Size = Sect.Size;
   } else {
-    MachO::section Sect = getSection(Sec);
-    Offset = Sect.offset;
-    Size = Sect.size;
+    macho::Section Sect =getSection(Sec);
+    Offset = Sect.Offset;
+    Size = Sect.Size;
   }
 
   Res = this->getData().substr(Offset, Size);
@@ -736,11 +729,11 @@ error_code
 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
   uint32_t Align;
   if (is64Bit()) {
-    MachO::section_64 Sect = getSection64(Sec);
-    Align = Sect.align;
+    macho::Section64 Sect = getSection64(Sec);
+    Align = Sect.Align;
   } else {
-    MachO::section Sect = getSection(Sec);
-    Align = Sect.align;
+    macho::Section Sect = getSection(Sec);
+    Align = Sect.Align;
   }
 
   Res = uint64_t(1) << Align;
@@ -750,7 +743,7 @@ MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
 error_code
 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
   uint32_t Flags = getSectionFlags(this, Sec);
-  Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
+  Res = Flags & macho::SF_PureInstructions;
   return object_error::success;
 }
 
@@ -826,11 +819,11 @@ MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
 relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
   uint32_t Offset;
   if (is64Bit()) {
-    MachO::section_64 Sect = getSection64(Sec);
-    Offset = Sect.reloff;
+    macho::Section64 Sect = getSection64(Sec);
+    Offset = Sect.RelocationTableOffset;
   } else {
-    MachO::section Sect = getSection(Sec);
-    Offset = Sect.reloff;
+    macho::Section Sect = getSection(Sec);
+    Offset = Sect.RelocationTableOffset;
   }
 
   DataRefImpl Ret;
@@ -843,17 +836,17 @@ MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
   uint32_t Offset;
   uint32_t Num;
   if (is64Bit()) {
-    MachO::section_64 Sect = getSection64(Sec);
-    Offset = Sect.reloff;
-    Num = Sect.nreloc;
+    macho::Section64 Sect = getSection64(Sec);
+    Offset = Sect.RelocationTableOffset;
+    Num = Sect.NumRelocationTableEntries;
   } else {
-    MachO::section Sect = getSection(Sec);
-    Offset = Sect.reloff;
-    Num = Sect.nreloc;
+    macho::Section Sect = getSection(Sec);
+    Offset = Sect.RelocationTableOffset;
+    Num = Sect.NumRelocationTableEntries;
   }
 
-  const MachO::any_relocation_info *P =
-    reinterpret_cast<const MachO::any_relocation_info *>(getPtr(this, Offset));
+  const macho::RelocationEntry *P =
+    reinterpret_cast<const macho::RelocationEntry*>(getPtr(this, Offset));
 
   DataRefImpl Ret;
   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
@@ -862,8 +855,8 @@ MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
 
 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
                                               RelocationRef &Res) const {
-  const MachO::any_relocation_info *P =
-    reinterpret_cast<const MachO::any_relocation_info *>(Rel.p);
+  const macho::RelocationEntry *P =
+    reinterpret_cast<const macho::RelocationEntry *>(Rel.p);
   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
   Res = RelocationRef(Rel, this);
   return object_error::success;
@@ -876,24 +869,24 @@ MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
 
 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
                                                 uint64_t &Res) const {
-  MachO::any_relocation_info RE = getRelocation(Rel);
+  macho::RelocationEntry RE = getRelocation(Rel);
   Res = getAnyRelocationAddress(RE);
   return object_error::success;
 }
 
 symbol_iterator
 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
-  MachO::any_relocation_info RE = getRelocation(Rel);
+  macho::RelocationEntry RE = getRelocation(Rel);
   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
   bool isExtern = getPlainRelocationExternal(RE);
   if (!isExtern)
     return end_symbols();
 
-  MachO::symtab_command S = getSymtabLoadCommand();
+  macho::SymtabLoadCommand S = getSymtabLoadCommand();
   unsigned SymbolTableEntrySize = is64Bit() ?
-    sizeof(MachO::nlist_64) :
-    sizeof(MachO::nlist);
-  uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
+    sizeof(macho::Symbol64TableEntry) :
+    sizeof(macho::SymbolTableEntry);
+  uint64_t Offset = S.SymbolTableOffset + SymbolIdx * SymbolTableEntrySize;
   DataRefImpl Sym;
   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
   return symbol_iterator(SymbolRef(Sym, this));
@@ -901,7 +894,7 @@ MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
 
 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
                                               uint64_t &Res) const {
-  MachO::any_relocation_info RE = getRelocation(Rel);
+  macho::RelocationEntry RE = getRelocation(Rel);
   Res = getAnyRelocationType(RE);
   return object_error::success;
 }
@@ -1002,7 +995,7 @@ MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
 error_code
 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
                                           SmallVectorImpl<char> &Result) const {
-  MachO::any_relocation_info RE = getRelocation(Rel);
+  macho::RelocationEntry RE = getRelocation(Rel);
 
   unsigned Arch = this->getArch();
 
@@ -1019,47 +1012,47 @@ MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
     bool isPCRel = getAnyRelocationPCRel(RE);
 
     switch (Type) {
-      case MachO::X86_64_RELOC_GOT_LOAD:
-      case MachO::X86_64_RELOC_GOT: {
+      case macho::RIT_X86_64_GOTLoad:   // X86_64_RELOC_GOT_LOAD
+      case macho::RIT_X86_64_GOT: {     // X86_64_RELOC_GOT
         printRelocationTargetName(this, RE, fmt);
         fmt << "@GOT";
         if (isPCRel) fmt << "PCREL";
         break;
       }
-      case MachO::X86_64_RELOC_SUBTRACTOR: {
+      case macho::RIT_X86_64_Subtractor: { // X86_64_RELOC_SUBTRACTOR
         DataRefImpl RelNext = Rel;
         RelNext.d.a++;
-        MachO::any_relocation_info RENext = getRelocation(RelNext);
+        macho::RelocationEntry RENext = getRelocation(RelNext);
 
-        // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
+        // X86_64_SUBTRACTOR must be followed by a relocation of type
         // X86_64_RELOC_UNSIGNED.
         // NOTE: Scattered relocations don't exist on x86_64.
         unsigned RType = getAnyRelocationType(RENext);
-        if (RType != MachO::X86_64_RELOC_UNSIGNED)
+        if (RType != 0)
           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
                              "X86_64_RELOC_SUBTRACTOR.");
 
-        // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
-        // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
+        // The X86_64_RELOC_UNSIGNED contains the minuend symbol,
+        // X86_64_SUBTRACTOR contains to the subtrahend.
         printRelocationTargetName(this, RENext, fmt);
         fmt << "-";
         printRelocationTargetName(this, RE, fmt);
         break;
       }
-      case MachO::X86_64_RELOC_TLV:
+      case macho::RIT_X86_64_TLV:
         printRelocationTargetName(this, RE, fmt);
         fmt << "@TLV";
         if (isPCRel) fmt << "P";
         break;
-      case MachO::X86_64_RELOC_SIGNED_1:
+      case macho::RIT_X86_64_Signed1: // X86_64_RELOC_SIGNED1
         printRelocationTargetName(this, RE, fmt);
         fmt << "-1";
         break;
-      case MachO::X86_64_RELOC_SIGNED_2:
+      case macho::RIT_X86_64_Signed2: // X86_64_RELOC_SIGNED2
         printRelocationTargetName(this, RE, fmt);
         fmt << "-2";
         break;
-      case MachO::X86_64_RELOC_SIGNED_4:
+      case macho::RIT_X86_64_Signed4: // X86_64_RELOC_SIGNED4
         printRelocationTargetName(this, RE, fmt);
         fmt << "-4";
         break;
@@ -1072,18 +1065,18 @@ MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
              Arch == Triple::ppc) {
     // Generic relocation types...
     switch (Type) {
-      case MachO::GENERIC_RELOC_PAIR: // prints no info
+      case macho::RIT_Pair: // GENERIC_RELOC_PAIR - prints no info
         return object_error::success;
-      case MachO::GENERIC_RELOC_SECTDIFF: {
+      case macho::RIT_Difference: { // GENERIC_RELOC_SECTDIFF
         DataRefImpl RelNext = Rel;
         RelNext.d.a++;
-        MachO::any_relocation_info RENext = getRelocation(RelNext);
+        macho::RelocationEntry RENext = getRelocation(RelNext);
 
         // X86 sect diff's must be followed by a relocation of type
         // GENERIC_RELOC_PAIR.
         unsigned RType = getAnyRelocationType(RENext);
 
-        if (RType != MachO::GENERIC_RELOC_PAIR)
+        if (RType != 1)
           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
                              "GENERIC_RELOC_SECTDIFF.");
 
@@ -1095,16 +1088,18 @@ MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
     }
 
     if (Arch == Triple::x86 || Arch == Triple::ppc) {
+      // All X86 relocations that need special printing were already
+      // handled in the generic code.
       switch (Type) {
-        case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
+        case macho::RIT_Generic_LocalDifference:{// GENERIC_RELOC_LOCAL_SECTDIFF
           DataRefImpl RelNext = Rel;
           RelNext.d.a++;
-          MachO::any_relocation_info RENext = getRelocation(RelNext);
+          macho::RelocationEntry RENext = getRelocation(RelNext);
 
           // X86 sect diff's must be followed by a relocation of type
           // GENERIC_RELOC_PAIR.
           unsigned RType = getAnyRelocationType(RENext);
-          if (RType != MachO::GENERIC_RELOC_PAIR)
+          if (RType != 1)
             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
 
@@ -1113,7 +1108,7 @@ MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
           printRelocationTargetName(this, RENext, fmt);
           break;
         }
-        case MachO::GENERIC_RELOC_TLV: {
+        case macho::RIT_Generic_TLV: {
           printRelocationTargetName(this, RE, fmt);
           fmt << "@TLV";
           if (IsPCRel) fmt << "P";
@@ -1124,8 +1119,8 @@ MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
       }
     } else { // ARM-specific relocations
       switch (Type) {
-        case MachO::ARM_RELOC_HALF:
-        case MachO::ARM_RELOC_HALF_SECTDIFF: {
+        case macho::RIT_ARM_Half:             // ARM_RELOC_HALF
+        case macho::RIT_ARM_HalfDifference: { // ARM_RELOC_HALF_SECTDIFF
           // Half relocations steal a bit from the length field to encode
           // whether this is an upper16 or a lower16 relocation.
           bool isUpper = getAnyRelocationLength(RE) >> 1;
@@ -1138,14 +1133,14 @@ MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
 
           DataRefImpl RelNext = Rel;
           RelNext.d.a++;
-          MachO::any_relocation_info RENext = getRelocation(RelNext);
+          macho::RelocationEntry RENext = getRelocation(RelNext);
 
           // ARM half relocs must be followed by a relocation of type
           // ARM_RELOC_PAIR.
           unsigned RType = getAnyRelocationType(RENext);
-          if (RType != MachO::ARM_RELOC_PAIR)
+          if (RType != 1)
             report_fatal_error("Expected ARM_RELOC_PAIR after "
-                               "ARM_RELOC_HALF");
+                               "GENERIC_RELOC_HALF");
 
           // NOTE: The half of the target virtual address is stashed in the
           // address field of the secondary relocation, but we can't reverse
@@ -1154,7 +1149,7 @@ MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
 
           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
           // symbol/section pointer of the follow-on relocation.
-          if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
+          if (Type == macho::RIT_ARM_HalfDifference) {
             fmt << "-";
             printRelocationTargetName(this, RENext, fmt);
           }
@@ -1186,16 +1181,16 @@ MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
   // is always hidden.
   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
-    if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
+    if (Type == macho::RIT_Pair) Result = true;
   } else if (Arch == Triple::x86_64) {
     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
     // an X86_64_RELOC_SUBTRACTOR.
-    if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
+    if (Type == macho::RIT_X86_64_Unsigned && Rel.d.a > 0) {
       DataRefImpl RelPrev = Rel;
       RelPrev.d.a--;
       uint64_t PrevType;
       getRelocationType(RelPrev, PrevType);
-      if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
+      if (PrevType == macho::RIT_X86_64_Subtractor)
         Result = true;
     }
   }
@@ -1218,8 +1213,8 @@ symbol_iterator MachOObjectFile::begin_symbols() const {
   if (!SymtabLoadCmd)
     return symbol_iterator(SymbolRef(DRI, this));
 
-  MachO::symtab_command Symtab = getSymtabLoadCommand();
-  DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
+  macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
+  DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.SymbolTableOffset));
   return symbol_iterator(SymbolRef(DRI, this));
 }
 
@@ -1228,12 +1223,12 @@ symbol_iterator MachOObjectFile::end_symbols() const {
   if (!SymtabLoadCmd)
     return symbol_iterator(SymbolRef(DRI, this));
 
-  MachO::symtab_command Symtab = getSymtabLoadCommand();
+  macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
   unsigned SymbolTableEntrySize = is64Bit() ?
-    sizeof(MachO::nlist_64) :
-    sizeof(MachO::nlist);
-  unsigned Offset = Symtab.symoff +
-    Symtab.nsyms * SymbolTableEntrySize;
+    sizeof(macho::Symbol64TableEntry) :
+    sizeof(macho::SymbolTableEntry);
+  unsigned Offset = Symtab.SymbolTableOffset +
+    Symtab.NumSymbolTableEntries * SymbolTableEntrySize;
   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
   return symbol_iterator(SymbolRef(DRI, this));
 }
@@ -1328,7 +1323,7 @@ unsigned MachOObjectFile::getArch() const {
 
 StringRef MachOObjectFile::getLoadName() const {
   // TODO: Implement
-  report_fatal_error("Load name unimplemented in MachOObjectFile");
+  report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
 }
 
 relocation_iterator MachOObjectFile::getSectionRelBegin(unsigned Index) const {
@@ -1348,8 +1343,8 @@ dice_iterator MachOObjectFile::begin_dices() const {
   if (!DataInCodeLoadCmd)
     return dice_iterator(DiceRef(DRI, this));
 
-  MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
-  DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
+  macho::LinkeditDataLoadCommand DicLC = getDataInCodeLoadCommand();
+  DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.DataOffset));
   return dice_iterator(DiceRef(DRI, this));
 }
 
@@ -1358,8 +1353,8 @@ dice_iterator MachOObjectFile::end_dices() const {
   if (!DataInCodeLoadCmd)
     return dice_iterator(DiceRef(DRI, this));
 
-  MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
-  unsigned Offset = DicLC.dataoff + DicLC.datasize;
+  macho::LinkeditDataLoadCommand DicLC = getDataInCodeLoadCommand();
+  unsigned Offset = DicLC.DataOffset + DicLC.DataSize;
   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
   return dice_iterator(DiceRef(DRI, this));
 }
@@ -1372,82 +1367,80 @@ MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
 
 ArrayRef<char>
 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
-  const section_base *Base =
-    reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
-  return ArrayRef<char>(Base->sectname);
+  const SectionBase *Base =
+    reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
+  return ArrayRef<char>(Base->Name);
 }
 
 ArrayRef<char>
 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
-  const section_base *Base =
-    reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
-  return ArrayRef<char>(Base->segname);
+  const SectionBase *Base =
+    reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
+  return ArrayRef<char>(Base->SegmentName);
 }
 
 bool
-MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
+MachOObjectFile::isRelocationScattered(const macho::RelocationEntry &RE)
   const {
-  if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
+  if (getCPUType(this) == llvm::MachO::CPU_TYPE_X86_64)
     return false;
-  return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
+  return getPlainRelocationAddress(RE) & macho::RF_Scattered;
 }
 
 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
-    const MachO::any_relocation_info &RE) const {
+    const macho::RelocationEntry &RE) const {
   if (isLittleEndian())
-    return RE.r_word1 & 0xffffff;
-  return RE.r_word1 >> 8;
+    return RE.Word1 & 0xffffff;
+  return RE.Word1 >> 8;
 }
 
 bool MachOObjectFile::getPlainRelocationExternal(
-    const MachO::any_relocation_info &RE) const {
+    const macho::RelocationEntry &RE) const {
   if (isLittleEndian())
-    return (RE.r_word1 >> 27) & 1;
-  return (RE.r_word1 >> 4) & 1;
+    return (RE.Word1 >> 27) & 1;
+  return (RE.Word1 >> 4) & 1;
 }
 
 bool MachOObjectFile::getScatteredRelocationScattered(
-    const MachO::any_relocation_info &RE) const {
-  return RE.r_word0 >> 31;
+    const macho::RelocationEntry &RE) const {
+  return RE.Word0 >> 31;
 }
 
 uint32_t MachOObjectFile::getScatteredRelocationValue(
-    const MachO::any_relocation_info &RE) const {
-  return RE.r_word1;
+    const macho::RelocationEntry &RE) const {
+  return RE.Word1;
 }
 
 unsigned MachOObjectFile::getAnyRelocationAddress(
-    const MachO::any_relocation_info &RE) const {
+    const macho::RelocationEntry &RE) const {
   if (isRelocationScattered(RE))
     return getScatteredRelocationAddress(RE);
   return getPlainRelocationAddress(RE);
 }
 
-unsigned MachOObjectFile::getAnyRelocationPCRel(
-    const MachO::any_relocation_info &RE) const {
+unsigned
+MachOObjectFile::getAnyRelocationPCRel(const macho::RelocationEntry &RE) const {
   if (isRelocationScattered(RE))
     return getScatteredRelocationPCRel(this, RE);
   return getPlainRelocationPCRel(this, RE);
 }
 
 unsigned MachOObjectFile::getAnyRelocationLength(
-    const MachO::any_relocation_info &RE) const {
+    const macho::RelocationEntry &RE) const {
   if (isRelocationScattered(RE))
     return getScatteredRelocationLength(RE);
   return getPlainRelocationLength(this, RE);
 }
 
 unsigned
-MachOObjectFile::getAnyRelocationType(
-                                   const MachO::any_relocation_info &RE) const {
+MachOObjectFile::getAnyRelocationType(const macho::RelocationEntry &RE) const {
   if (isRelocationScattered(RE))
     return getScatteredRelocationType(RE);
   return getPlainRelocationType(this, RE);
 }
 
 SectionRef
-MachOObjectFile::getRelocationSection(
-                                   const MachO::any_relocation_info &RE) const {
+MachOObjectFile::getRelocationSection(const macho::RelocationEntry &RE) const {
   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
     return *end_sections();
   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
@@ -1460,132 +1453,133 @@ MachOObjectFile::LoadCommandInfo
 MachOObjectFile::getFirstLoadCommandInfo() const {
   MachOObjectFile::LoadCommandInfo Load;
 
-  unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
-                                    sizeof(MachO::mach_header);
+  unsigned HeaderSize = is64Bit() ? macho::Header64Size : macho::Header32Size;
   Load.Ptr = getPtr(this, HeaderSize);
-  Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
+  Load.C = getStruct<macho::LoadCommand>(this, Load.Ptr);
   return Load;
 }
 
 MachOObjectFile::LoadCommandInfo
 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
   MachOObjectFile::LoadCommandInfo Next;
-  Next.Ptr = L.Ptr + L.C.cmdsize;
-  Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
+  Next.Ptr = L.Ptr + L.C.Size;
+  Next.C = getStruct<macho::LoadCommand>(this, Next.Ptr);
   return Next;
 }
 
-MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
-  return getStruct<MachO::section>(this, Sections[DRI.d.a]);
+macho::Section MachOObjectFile::getSection(DataRefImpl DRI) const {
+  return getStruct<macho::Section>(this, Sections[DRI.d.a]);
 }
 
-MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
-  return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
+macho::Section64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
+  return getStruct<macho::Section64>(this, Sections[DRI.d.a]);
 }
 
-MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
+macho::Section MachOObjectFile::getSection(const LoadCommandInfo &L,
                                            unsigned Index) const {
   const char *Sec = getSectionPtr(this, L, Index);
-  return getStruct<MachO::section>(this, Sec);
+  return getStruct<macho::Section>(this, Sec);
 }
 
-MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
-                                                unsigned Index) const {
+macho::Section64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
+                                               unsigned Index) const {
   const char *Sec = getSectionPtr(this, L, Index);
-  return getStruct<MachO::section_64>(this, Sec);
+  return getStruct<macho::Section64>(this, Sec);
 }
 
-MachO::nlist
+macho::SymbolTableEntry
 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
   const char *P = reinterpret_cast<const char *>(DRI.p);
-  return getStruct<MachO::nlist>(this, P);
+  return getStruct<macho::SymbolTableEntry>(this, P);
 }
 
-MachO::nlist_64
+macho::Symbol64TableEntry
 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
   const char *P = reinterpret_cast<const char *>(DRI.p);
-  return getStruct<MachO::nlist_64>(this, P);
+  return getStruct<macho::Symbol64TableEntry>(this, P);
 }
 
-MachO::linkedit_data_command
-MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
-  return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
+macho::LinkeditDataLoadCommand MachOObjectFile::getLinkeditDataLoadCommand(
+    const MachOObjectFile::LoadCommandInfo &L) const {
+  return getStruct<macho::LinkeditDataLoadCommand>(this, L.Ptr);
 }
 
-MachO::segment_command
+macho::SegmentLoadCommand
 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
-  return getStruct<MachO::segment_command>(this, L.Ptr);
+  return getStruct<macho::SegmentLoadCommand>(this, L.Ptr);
 }
 
-MachO::segment_command_64
+macho::Segment64LoadCommand
 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
-  return getStruct<MachO::segment_command_64>(this, L.Ptr);
+  return getStruct<macho::Segment64LoadCommand>(this, L.Ptr);
 }
 
-MachO::linker_options_command
+macho::LinkerOptionsLoadCommand
 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
-  return getStruct<MachO::linker_options_command>(this, L.Ptr);
+  return getStruct<macho::LinkerOptionsLoadCommand>(this, L.Ptr);
 }
 
-MachO::any_relocation_info
+macho::RelocationEntry
 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
   const char *P = reinterpret_cast<const char *>(Rel.p);
-  return getStruct<MachO::any_relocation_info>(this, P);
+  return getStruct<macho::RelocationEntry>(this, P);
 }
 
-MachO::data_in_code_entry
+macho::DataInCodeTableEntry
 MachOObjectFile::getDice(DataRefImpl Rel) const {
   const char *P = reinterpret_cast<const char *>(Rel.p);
-  return getStruct<MachO::data_in_code_entry>(this, P);
+  return getStruct<macho::DataInCodeTableEntry>(this, P);
 }
 
-MachO::mach_header MachOObjectFile::getHeader() const {
-  return getStruct<MachO::mach_header>(this, getPtr(this, 0));
+macho::Header MachOObjectFile::getHeader() const {
+  return getStruct<macho::Header>(this, getPtr(this, 0));
 }
 
-MachO::mach_header_64 MachOObjectFile::getHeader64() const {
-  return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
+macho::Header64Ext MachOObjectFile::getHeader64Ext() const {
+  return
+    getStruct<macho::Header64Ext>(this, getPtr(this, sizeof(macho::Header)));
 }
 
-uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
-                                             const MachO::dysymtab_command &DLC,
-                                             unsigned Index) const {
-  uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
-  return getStruct<uint32_t>(this, getPtr(this, Offset));
+macho::IndirectSymbolTableEntry MachOObjectFile::getIndirectSymbolTableEntry(
+                                          const macho::DysymtabLoadCommand &DLC,
+                                          unsigned Index) const {
+  uint64_t Offset = DLC.IndirectSymbolTableOffset +
+    Index * sizeof(macho::IndirectSymbolTableEntry);
+  return getStruct<macho::IndirectSymbolTableEntry>(this, getPtr(this, Offset));
 }
 
-MachO::data_in_code_entry
+macho::DataInCodeTableEntry
 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
                                          unsigned Index) const {
-  uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
-  return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
+  uint64_t Offset = DataOffset + Index * sizeof(macho::DataInCodeTableEntry);
+  return getStruct<macho::DataInCodeTableEntry>(this, getPtr(this, Offset));
 }
 
-MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
-  return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
+macho::SymtabLoadCommand MachOObjectFile::getSymtabLoadCommand() const {
+  return getStruct<macho::SymtabLoadCommand>(this, SymtabLoadCmd);
 }
 
-MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
-  return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
+macho::DysymtabLoadCommand MachOObjectFile::getDysymtabLoadCommand() const {
+  return getStruct<macho::DysymtabLoadCommand>(this, DysymtabLoadCmd);
 }
 
-MachO::linkedit_data_command
+macho::LinkeditDataLoadCommand
 MachOObjectFile::getDataInCodeLoadCommand() const {
   if (DataInCodeLoadCmd)
-    return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
+    return getStruct<macho::LinkeditDataLoadCommand>(this, DataInCodeLoadCmd);
 
   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
-  MachO::linkedit_data_command Cmd;
-  Cmd.cmd = MachO::LC_DATA_IN_CODE;
-  Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
-  Cmd.dataoff = 0;
-  Cmd.datasize = 0;
+  macho::LinkeditDataLoadCommand Cmd;
+  Cmd.Type = macho::LCT_DataInCode;
+  Cmd.Size = macho::LinkeditLoadCommandSize;
+  Cmd.DataOffset = 0;
+  Cmd.DataSize = 0;
   return Cmd;
 }
 
 StringRef MachOObjectFile::getStringTableData() const {
-  MachO::symtab_command S = getSymtabLoadCommand();
-  return getData().substr(S.stroff, S.strsize);
+  macho::SymtabLoadCommand S = getSymtabLoadCommand();
+  return getData().substr(S.StringTableOffset, S.StringTableSize);
 }
 
 bool MachOObjectFile::is64Bit() const {
diff --git a/lib/Object/MachOUniversal.cpp b/lib/Object/MachOUniversal.cpp
index 75160af3ad..b76f10eb6d 100644
--- a/lib/Object/MachOUniversal.cpp
+++ b/lib/Object/MachOUniversal.cpp
@@ -31,18 +31,18 @@ template<typename T>
 static void SwapStruct(T &Value);
 
 template<>
-void SwapStruct(MachO::fat_header &H) {
-  SwapValue(H.magic);
-  SwapValue(H.nfat_arch);
+void SwapStruct(macho::FatHeader &H) {
+  SwapValue(H.Magic);
+  SwapValue(H.NumFatArch);
 }
 
 template<>
-void SwapStruct(MachO::fat_arch &H) {
-  SwapValue(H.cputype);
-  SwapValue(H.cpusubtype);
-  SwapValue(H.offset);
-  SwapValue(H.size);
-  SwapValue(H.align);
+void SwapStruct(macho::FatArchHeader &H) {
+  SwapValue(H.CPUType);
+  SwapValue(H.CPUSubtype);
+  SwapValue(H.Offset);
+  SwapValue(H.Size);
+  SwapValue(H.Align);
 }
 
 template<typename T>
@@ -63,10 +63,10 @@ MachOUniversalBinary::ObjectForArch::ObjectForArch(
   } else {
     // Parse object header.
     StringRef ParentData = Parent->getData();
-    const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
-                            Index * sizeof(MachO::fat_arch);
-    Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
-    if (ParentData.size() < Header.offset + Header.size) {
+    const char *HeaderPos = ParentData.begin() + macho::FatHeaderSize +
+                            Index * macho::FatArchHeaderSize;
+    Header = getUniversalBinaryStruct<macho::FatArchHeader>(HeaderPos);
+    if (ParentData.size() < Header.Offset + Header.Size) {
       clear();
     }
   }
@@ -76,10 +76,10 @@ error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
     OwningPtr<ObjectFile> &Result) const {
   if (Parent) {
     StringRef ParentData = Parent->getData();
-    StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
+    StringRef ObjectData = ParentData.substr(Header.Offset, Header.Size);
     std::string ObjectName =
         Parent->getFileName().str() + ":" +
-        Triple::getArchTypeName(MachOObjectFile::getArch(Header.cputype));
+        Triple::getArchTypeName(MachOObjectFile::getArch(Header.CPUType));
     MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
         ObjectData, ObjectName, false);
     if (ObjectFile *Obj = ObjectFile::createMachOObjectFile(ObjBuffer)) {
@@ -96,31 +96,31 @@ MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
                                            error_code &ec)
   : Binary(Binary::ID_MachOUniversalBinary, Source),
     NumberOfObjects(0) {
-  if (Source->getBufferSize() < sizeof(MachO::fat_header)) {
+  if (Source->getBufferSize() < macho::FatHeaderSize) {
     ec = object_error::invalid_file_type;
     return;
   }
   // Check for magic value and sufficient header size.
   StringRef Buf = getData();
-  MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
-  NumberOfObjects = H.nfat_arch;
-  uint32_t MinSize = sizeof(MachO::fat_header) +
-                     sizeof(MachO::fat_arch) * NumberOfObjects;
-  if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
+  macho::FatHeader H = getUniversalBinaryStruct<macho::FatHeader>(Buf.begin());
+  NumberOfObjects = H.NumFatArch;
+  uint32_t MinSize = macho::FatHeaderSize +
+                     macho::FatArchHeaderSize * NumberOfObjects;
+  if (H.Magic != macho::HM_Universal || Buf.size() < MinSize) {
     ec = object_error::parse_failed;
     return;
   }
   ec = object_error::success;
 }
 
-static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
+static bool getCTMForArch(Triple::ArchType Arch, mach::CPUTypeMachine &CTM) {
   switch (Arch) {
-    case Triple::x86:    CTM = MachO::CPU_TYPE_I386; return true;
-    case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
-    case Triple::arm:    CTM = MachO::CPU_TYPE_ARM; return true;
-    case Triple::sparc:  CTM = MachO::CPU_TYPE_SPARC; return true;
-    case Triple::ppc:    CTM = MachO::CPU_TYPE_POWERPC; return true;
-    case Triple::ppc64:  CTM = MachO::CPU_TYPE_POWERPC64; return true;
+    case Triple::x86:    CTM = mach::CTM_i386; return true;
+    case Triple::x86_64: CTM = mach::CTM_x86_64; return true;
+    case Triple::arm:    CTM = mach::CTM_ARM; return true;
+    case Triple::sparc:  CTM = mach::CTM_SPARC; return true;
+    case Triple::ppc:    CTM = mach::CTM_PowerPC; return true;
+    case Triple::ppc64:  CTM = mach::CTM_PowerPC64; return true;
     default: return false;
   }
 }
@@ -128,7 +128,7 @@ static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
 error_code
 MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
                                        OwningPtr<ObjectFile> &Result) const {
-  MachO::CPUType CTM;
+  mach::CPUTypeMachine CTM;
   if (!getCTMForArch(Arch, CTM))
     return object_error::arch_not_found;
   for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
diff --git a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
index 828442fd89..b1e25d8b89 100644
--- a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
@@ -25,9 +25,9 @@
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/MC/MCValue.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MachO.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
@@ -640,16 +640,16 @@ public:
 // FIXME: This should be in a separate file.
 class DarwinARMAsmBackend : public ARMAsmBackend {
 public:
-  const MachO::CPUSubTypeARM Subtype;
+  const object::mach::CPUSubtypeARM Subtype;
   DarwinARMAsmBackend(const Target &T, const StringRef TT,
-                      MachO::CPUSubTypeARM st)
+                      object::mach::CPUSubtypeARM st)
     : ARMAsmBackend(T, TT), Subtype(st) {
       HasDataInCodeSupport = true;
     }
 
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return createARMMachObjectWriter(OS, /*Is64Bit=*/false,
-                                     MachO::CPU_TYPE_ARM,
+                                     object::mach::CTM_ARM,
                                      Subtype);
   }
 
@@ -664,18 +664,18 @@ MCAsmBackend *llvm::createARMAsmBackend(const Target &T, StringRef TT, StringRef
   Triple TheTriple(TT);
 
   if (TheTriple.isOSDarwin()) {
-    MachO::CPUSubTypeARM CS =
-      StringSwitch<MachO::CPUSubTypeARM>(TheTriple.getArchName())
-      .Cases("armv4t", "thumbv4t", MachO::CPU_SUBTYPE_ARM_V4T)
-      .Cases("armv5e", "thumbv5e", MachO::CPU_SUBTYPE_ARM_V5TEJ)
-      .Cases("armv6", "thumbv6", MachO::CPU_SUBTYPE_ARM_V6)
-      .Cases("armv6m", "thumbv6m", MachO::CPU_SUBTYPE_ARM_V6M)
-      .Cases("armv7em", "thumbv7em", MachO::CPU_SUBTYPE_ARM_V7EM)
-      .Cases("armv7f", "thumbv7f", MachO::CPU_SUBTYPE_ARM_V7F)
-      .Cases("armv7k", "thumbv7k", MachO::CPU_SUBTYPE_ARM_V7K)
-      .Cases("armv7m", "thumbv7m", MachO::CPU_SUBTYPE_ARM_V7M)
-      .Cases("armv7s", "thumbv7s", MachO::CPU_SUBTYPE_ARM_V7S)
-      .Default(MachO::CPU_SUBTYPE_ARM_V7);
+    object::mach::CPUSubtypeARM CS =
+      StringSwitch<object::mach::CPUSubtypeARM>(TheTriple.getArchName())
+      .Cases("armv4t", "thumbv4t", object::mach::CSARM_V4T)
+      .Cases("armv5e", "thumbv5e",object::mach::CSARM_V5TEJ)
+      .Cases("armv6", "thumbv6", object::mach::CSARM_V6)
+      .Cases("armv6m", "thumbv6m", object::mach::CSARM_V6M)
+      .Cases("armv7em", "thumbv7em", object::mach::CSARM_V7EM)
+      .Cases("armv7f", "thumbv7f", object::mach::CSARM_V7F)
+      .Cases("armv7k", "thumbv7k", object::mach::CSARM_V7K)
+      .Cases("armv7m", "thumbv7m", object::mach::CSARM_V7M)
+      .Cases("armv7s", "thumbv7s", object::mach::CSARM_V7S)
+      .Default(object::mach::CSARM_V7);
 
     return new DarwinARMAsmBackend(T, TT, CS);
   }
diff --git a/lib/Target/ARM/MCTargetDesc/ARMMachObjectWriter.cpp b/lib/Target/ARM/MCTargetDesc/ARMMachObjectWriter.cpp
index ee43f5f5e8..b9efe74b41 100644
--- a/lib/Target/ARM/MCTargetDesc/ARMMachObjectWriter.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMMachObjectWriter.cpp
@@ -20,9 +20,10 @@
 #include "llvm/MC/MCMachOSymbolFlags.h"
 #include "llvm/MC/MCMachObjectWriter.h"
 #include "llvm/MC/MCValue.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MachO.h"
 using namespace llvm;
+using namespace llvm::object;
 
 namespace {
 class ARMMachObjectWriter : public MCMachObjectTargetWriter {
@@ -62,7 +63,7 @@ public:
 
 static bool getARMFixupKindMachOInfo(unsigned Kind, unsigned &RelocType,
                               unsigned &Log2Size) {
-  RelocType = unsigned(MachO::ARM_RELOC_VANILLA);
+  RelocType = unsigned(macho::RIT_Vanilla);
   Log2Size = ~0U;
 
   switch (Kind) {
@@ -91,21 +92,21 @@ static bool getARMFixupKindMachOInfo(unsigned Kind, unsigned &RelocType,
   case ARM::fixup_arm_uncondbl:
   case ARM::fixup_arm_condbl:
   case ARM::fixup_arm_blx:
-    RelocType = unsigned(MachO::ARM_RELOC_BR24);
+    RelocType = unsigned(macho::RIT_ARM_Branch24Bit);
     // Report as 'long', even though that is not quite accurate.
     Log2Size = llvm::Log2_32(4);
     return true;
 
     // Handle Thumb branches.
   case ARM::fixup_arm_thumb_br:
-    RelocType = unsigned(MachO::ARM_THUMB_RELOC_BR22);
+    RelocType = unsigned(macho::RIT_ARM_ThumbBranch22Bit);
     Log2Size = llvm::Log2_32(2);
     return true;
 
   case ARM::fixup_t2_uncondbranch:
   case ARM::fixup_arm_thumb_bl:
   case ARM::fixup_arm_thumb_blx:
-    RelocType = unsigned(MachO::ARM_THUMB_RELOC_BR22);
+    RelocType = unsigned(macho::RIT_ARM_ThumbBranch22Bit);
     Log2Size = llvm::Log2_32(4);
     return true;
 
@@ -120,23 +121,23 @@ static bool getARMFixupKindMachOInfo(unsigned Kind, unsigned &RelocType,
   //      1 - thumb instructions
   case ARM::fixup_arm_movt_hi16:
   case ARM::fixup_arm_movt_hi16_pcrel:
-    RelocType = unsigned(MachO::ARM_RELOC_HALF);
+    RelocType = unsigned(macho::RIT_ARM_Half);
     Log2Size = 1;
     return true;
   case ARM::fixup_t2_movt_hi16:
   case ARM::fixup_t2_movt_hi16_pcrel:
-    RelocType = unsigned(MachO::ARM_RELOC_HALF);
+    RelocType = unsigned(macho::RIT_ARM_Half);
     Log2Size = 3;
     return true;
 
   case ARM::fixup_arm_movw_lo16:
   case ARM::fixup_arm_movw_lo16_pcrel:
-    RelocType = unsigned(MachO::ARM_RELOC_HALF);
+    RelocType = unsigned(macho::RIT_ARM_Half);
     Log2Size = 0;
     return true;
   case ARM::fixup_t2_movw_lo16:
   case ARM::fixup_t2_movw_lo16_pcrel:
-    RelocType = unsigned(MachO::ARM_RELOC_HALF);
+    RelocType = unsigned(macho::RIT_ARM_Half);
     Log2Size = 2;
     return true;
   }
@@ -152,7 +153,7 @@ RecordARMScatteredHalfRelocation(MachObjectWriter *Writer,
                                  uint64_t &FixedValue) {
   uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset();
   unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind());
-  unsigned Type = MachO::ARM_RELOC_HALF;
+  unsigned Type = macho::RIT_ARM_Half;
 
   // See <reloc.h>.
   const MCSymbol *A = &Target.getSymA()->getSymbol();
@@ -178,7 +179,7 @@ RecordARMScatteredHalfRelocation(MachObjectWriter *Writer,
                          "' can not be undefined in a subtraction expression");
 
     // Select the appropriate difference relocation type.
-    Type = MachO::ARM_RELOC_HALF_SECTDIFF;
+    Type = macho::RIT_ARM_HalfDifference;
     Value2 = Writer->getSymbolAddress(B_SD, Layout);
     FixedValue -= Writer->getSectionAddress(B_SD->getFragment()->getParent());
   }
@@ -222,28 +223,29 @@ RecordARMScatteredHalfRelocation(MachObjectWriter *Writer,
     break;
   }
 
-  MachO::scattered_relocation_info MRE;
-  if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
+  if (Type == macho::RIT_ARM_HalfDifference) {
     uint32_t OtherHalf = MovtBit
       ? (FixedValue & 0xffff) : ((FixedValue & 0xffff0000) >> 16);
 
-    MRE.r_address = OtherHalf;
-    MRE.r_type = MachO::ARM_RELOC_PAIR;
-    MRE.r_length = ((MovtBit  << 0) |
-                    (ThumbBit << 1));
-    MRE.r_pcrel = IsPCRel;
-    MRE.r_scattered = 1;
-    MRE.r_value = Value2;
+    macho::RelocationEntry MRE;
+    MRE.Word0 = ((OtherHalf       <<  0) |
+                 (macho::RIT_Pair << 24) |
+                 (MovtBit         << 28) |
+                 (ThumbBit        << 29) |
+                 (IsPCRel         << 30) |
+                 macho::RF_Scattered);
+    MRE.Word1 = Value2;
     Writer->addRelocation(Fragment->getParent(), MRE);
   }
 
-  MRE.r_address = FixupOffset;
-  MRE.r_type = Type;
-  MRE.r_length = ((MovtBit  << 0) |
-                  (ThumbBit << 1));
-  MRE.r_pcrel = IsPCRel;
-  MRE.r_scattered = 1;
-  MRE.r_value = Value;
+  macho::RelocationEntry MRE;
+  MRE.Word0 = ((FixupOffset <<  0) |
+               (Type        << 24) |
+               (MovtBit     << 28) |
+               (ThumbBit    << 29) |
+               (IsPCRel     << 30) |
+               macho::RF_Scattered);
+  MRE.Word1 = Value;
   Writer->addRelocation(Fragment->getParent(), MRE);
 }
 
@@ -257,7 +259,7 @@ void ARMMachObjectWriter::RecordARMScatteredRelocation(MachObjectWriter *Writer,
                                                     uint64_t &FixedValue) {
   uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset();
   unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind());
-  unsigned Type = MachO::ARM_RELOC_VANILLA;
+  unsigned Type = macho::RIT_Vanilla;
 
   // See <reloc.h>.
   const MCSymbol *A = &Target.getSymA()->getSymbol();
@@ -282,30 +284,31 @@ void ARMMachObjectWriter::RecordARMScatteredRelocation(MachObjectWriter *Writer,
                          "' can not be undefined in a subtraction expression");
 
     // Select the appropriate difference relocation type.
-    Type = MachO::ARM_RELOC_SECTDIFF;
+    Type = macho::RIT_Difference;
     Value2 = Writer->getSymbolAddress(B_SD, Layout);
     FixedValue -= Writer->getSectionAddress(B_SD->getFragment()->getParent());
   }
 
-  MachO::scattered_relocation_info MRE;
   // Relocations are written out in reverse order, so the PAIR comes first.
-  if (Type == MachO::ARM_RELOC_SECTDIFF ||
-      Type == MachO::ARM_RELOC_LOCAL_SECTDIFF) {
-    MRE.r_address = 0;
-    MRE.r_type = MachO::ARM_RELOC_PAIR;
-    MRE.r_length = Log2Size;
-    MRE.r_pcrel = IsPCRel;
-    MRE.r_scattered = 1;
-    MRE.r_value = Value2;
+  if (Type == macho::RIT_Difference ||
+      Type == macho::RIT_Generic_LocalDifference) {
+    macho::RelocationEntry MRE;
+    MRE.Word0 = ((0         <<  0) |
+                 (macho::RIT_Pair  << 24) |
+                 (Log2Size  << 28) |
+                 (IsPCRel   << 30) |
+                 macho::RF_Scattered);
+    MRE.Word1 = Value2;
     Writer->addRelocation(Fragment->getParent(), MRE);
   }
 
-  MRE.r_address = FixupOffset;
-  MRE.r_type = Type;
-  MRE.r_length = Log2Size;
-  MRE.r_pcrel = IsPCRel;
-  MRE.r_scattered = 1;
-  MRE.r_value = Value;
+  macho::RelocationEntry MRE;
+  MRE.Word0 = ((FixupOffset <<  0) |
+               (Type        << 24) |
+               (Log2Size    << 28) |
+               (IsPCRel     << 30) |
+               macho::RF_Scattered);
+  MRE.Word1 = Value;
   Writer->addRelocation(Fragment->getParent(), MRE);
 }
 
@@ -323,13 +326,13 @@ bool ARMMachObjectWriter::requiresExternRelocation(MachObjectWriter *Writer,
   switch (RelocType) {
   default:
     return false;
-  case MachO::ARM_RELOC_BR24:
+  case macho::RIT_ARM_Branch24Bit:
     // PC pre-adjustment of 8 for these instructions.
     Value -= 8;
     // ARM BL/BLX has a 25-bit offset.
     Range = 0x1ffffff;
     break;
-  case MachO::ARM_THUMB_RELOC_BR22:
+  case macho::RIT_ARM_ThumbBranch22Bit:
     // PC pre-adjustment of 4 for these instructions.
     Value -= 4;
     // Thumb BL/BLX has a 24-bit offset.
@@ -358,7 +361,7 @@ void ARMMachObjectWriter::RecordRelocation(MachObjectWriter *Writer,
                                            uint64_t &FixedValue) {
   unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind());
   unsigned Log2Size;
-  unsigned RelocType = MachO::ARM_RELOC_VANILLA;
+  unsigned RelocType = macho::RIT_Vanilla;
   if (!getARMFixupKindMachOInfo(Fixup.getKind(), RelocType, Log2Size))
     // If we failed to get fixup kind info, it's because there's no legal
     // relocation type for the fixup kind. This happens when it's a fixup that's
@@ -371,7 +374,7 @@ void ARMMachObjectWriter::RecordRelocation(MachObjectWriter *Writer,
   // scattered relocation entry.  Differences always require scattered
   // relocations.
   if (Target.getSymB()) {
-    if (RelocType == MachO::ARM_RELOC_HALF)
+    if (RelocType == macho::RIT_ARM_Half)
       return RecordARMScatteredHalfRelocation(Writer, Asm, Layout, Fragment,
                                               Fixup, Target, FixedValue);
     return RecordARMScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup,
@@ -389,7 +392,7 @@ void ARMMachObjectWriter::RecordRelocation(MachObjectWriter *Writer,
   //
   // Is this right for ARM?
   uint32_t Offset = Target.getConstant();
-  if (IsPCRel && RelocType == MachO::ARM_RELOC_VANILLA)
+  if (IsPCRel && RelocType == macho::RIT_Vanilla)
     Offset += 1 << Log2Size;
   if (Offset && SD && !Writer->doesSymbolRequireExternRelocation(SD))
     return RecordARMScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup,
@@ -442,17 +445,17 @@ void ARMMachObjectWriter::RecordRelocation(MachObjectWriter *Writer,
   }
 
   // struct relocation_info (8 bytes)
-  MachO::relocation_info MRE;
-  MRE.r_address = FixupOffset;
-  MRE.r_symbolnum = Index;
-  MRE.r_pcrel = IsPCRel;
-  MRE.r_length = Log2Size;
-  MRE.r_extern = IsExtern;
-  MRE.r_type = Type;
+  macho::RelocationEntry MRE;
+  MRE.Word0 = FixupOffset;
+  MRE.Word1 = ((Index     <<  0) |
+               (IsPCRel   << 24) |
+               (Log2Size  << 25) |
+               (IsExtern  << 27) |
+               (Type      << 28));
 
   // Even when it's not a scattered relocation, movw/movt always uses
   // a PAIR relocation.
-  if (Type == MachO::ARM_RELOC_HALF) {
+  if (Type == macho::RIT_ARM_Half) {
     // The other-half value only gets populated for the movt and movw
     // relocation entries.
     uint32_t Value = 0;
@@ -471,12 +474,11 @@ void ARMMachObjectWriter::RecordRelocation(MachObjectWriter *Writer,
       Value = FixedValue & 0xffff;
       break;
     }
-    MachO::relocation_info MREPair;
-    MREPair.r_address = Value;
-    MREPair.r_symbolnum = 0xffffff;
-    MREPair.r_length = Log2Size;
-    MREPair.r_pcrel = MREPair.r_extern = 0;
-    MREPair.r_type = MachO::ARM_RELOC_PAIR;
+    macho::RelocationEntry MREPair;
+    MREPair.Word0 = Value;
+    MREPair.Word1 = ((0xffffff) |
+                     (Log2Size << 25) |
+                     (macho::RIT_Pair << 28));
 
     Writer->addRelocation(Fragment->getParent(), MREPair);
   }
diff --git a/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp b/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
index ffeac43c13..dd619548d0 100644
--- a/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
+++ b/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
@@ -16,9 +16,9 @@
 #include "llvm/MC/MCObjectWriter.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCValue.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MachO.h"
 #include "llvm/Support/TargetRegistry.h"
 using namespace llvm;
 
@@ -164,8 +164,8 @@ namespace {
       return createPPCMachObjectWriter(
           OS,
           /*Is64Bit=*/is64,
-          (is64 ? MachO::CPU_TYPE_POWERPC64 : MachO::CPU_TYPE_POWERPC),
-          MachO::CPU_SUBTYPE_POWERPC_ALL);
+          (is64 ? object::mach::CTM_PowerPC64 : object::mach::CTM_PowerPC),
+          object::mach::CSPPC_ALL);
     }
 
     virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
diff --git a/lib/Target/PowerPC/MCTargetDesc/PPCMachObjectWriter.cpp b/lib/Target/PowerPC/MCTargetDesc/PPCMachObjectWriter.cpp
index aea3c5b209..fc9b892fb0 100644
--- a/lib/Target/PowerPC/MCTargetDesc/PPCMachObjectWriter.cpp
+++ b/lib/Target/PowerPC/MCTargetDesc/PPCMachObjectWriter.cpp
@@ -16,11 +16,12 @@
 #include "llvm/MC/MCMachObjectWriter.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCValue.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Format.h"
-#include "llvm/Support/MachO.h"
 
 using namespace llvm;
+using namespace llvm::object;
 
 namespace {
 class PPCMachObjectWriter : public MCMachObjectTargetWriter {
@@ -89,29 +90,29 @@ static unsigned getRelocType(const MCValue &Target,
       Target.isAbsolute() ? MCSymbolRefExpr::VK_None
                           : Target.getSymA()->getKind();
   // determine the type of the relocation
-  unsigned Type = MachO::GENERIC_RELOC_VANILLA;
+  unsigned Type = macho::RIT_Vanilla;
   if (IsPCRel) { // relative to PC
     switch ((unsigned)FixupKind) {
     default:
       report_fatal_error("Unimplemented fixup kind (relative)");
     case PPC::fixup_ppc_br24:
-      Type = MachO::PPC_RELOC_BR24; // R_PPC_REL24
+      Type = macho::RIT_PPC_BR24; // R_PPC_REL24
       break;
     case PPC::fixup_ppc_brcond14:
-      Type = MachO::PPC_RELOC_BR14;
+      Type = macho::RIT_PPC_BR14;
       break;
     case PPC::fixup_ppc_half16:
       switch (Modifier) {
       default:
         llvm_unreachable("Unsupported modifier for half16 fixup");
       case MCSymbolRefExpr::VK_PPC_HA:
-        Type = MachO::PPC_RELOC_HA16;
+        Type = macho::RIT_PPC_HA16;
         break;
       case MCSymbolRefExpr::VK_PPC_LO:
-        Type = MachO::PPC_RELOC_LO16;
+        Type = macho::RIT_PPC_LO16;
         break;
       case MCSymbolRefExpr::VK_PPC_HI:
-        Type = MachO::PPC_RELOC_HI16;
+        Type = macho::RIT_PPC_HI16;
         break;
       }
       break;
@@ -125,13 +126,13 @@ static unsigned getRelocType(const MCValue &Target,
       default:
         llvm_unreachable("Unsupported modifier for half16 fixup");
       case MCSymbolRefExpr::VK_PPC_HA:
-        Type = MachO::PPC_RELOC_HA16_SECTDIFF;
+        Type = macho::RIT_PPC_HA16_SECTDIFF;
         break;
       case MCSymbolRefExpr::VK_PPC_LO:
-        Type = MachO::PPC_RELOC_LO16_SECTDIFF;
+        Type = macho::RIT_PPC_LO16_SECTDIFF;
         break;
       case MCSymbolRefExpr::VK_PPC_HI:
-        Type = MachO::PPC_RELOC_HI16_SECTDIFF;
+        Type = macho::RIT_PPC_HI16_SECTDIFF;
         break;
       }
       break;
@@ -144,34 +145,30 @@ static unsigned getRelocType(const MCValue &Target,
   return Type;
 }
 
-static void makeRelocationInfo(MachO::any_relocation_info &MRE,
+static void makeRelocationInfo(macho::RelocationEntry &MRE,
                                const uint32_t FixupOffset, const uint32_t Index,
                                const unsigned IsPCRel, const unsigned Log2Size,
                                const unsigned IsExtern, const unsigned Type) {
-  MRE.r_word0 = FixupOffset;
+  MRE.Word0 = FixupOffset;
   // The bitfield offsets that work (as determined by trial-and-error)
   // are different than what is documented in the mach-o manuals.
-  // This appears to be an endianness issue; reversing the order of the
-  // documented bitfields in <llvm/Support/MachO.h> fixes this (but
-  // breaks x86/ARM assembly).
-  MRE.r_word1 = ((Index << 8) |    // was << 0
-                 (IsPCRel << 7) |  // was << 24
-                 (Log2Size << 5) | // was << 25
-                 (IsExtern << 4) | // was << 27
-                 (Type << 0));     // was << 28
+  // Is this an endianness issue w/ PPC?
+  MRE.Word1 = ((Index << 8) |    // was << 0
+               (IsPCRel << 7) |  // was << 24
+               (Log2Size << 5) | // was << 25
+               (IsExtern << 4) | // was << 27
+               (Type << 0));     // was << 28
 }
 
 static void
-makeScatteredRelocationInfo(MachO::scattered_relocation_info &MRE,
-                            const uint32_t Addr, const unsigned Type,
-                            const unsigned Log2Size, const unsigned IsPCRel,
-                            const uint32_t Value2) {
-  MRE.r_scattered = true;
-  MRE.r_pcrel = IsPCRel;
-  MRE.r_length = Log2Size;
-  MRE.r_type = Type;
-  MRE.r_address = Addr;
-  MRE.r_value = Value2;
+makeScatteredRelocationInfo(macho::RelocationEntry &MRE, const uint32_t Addr,
+                            const unsigned Type, const unsigned Log2Size,
+                            const unsigned IsPCRel, const uint32_t Value2) {
+  // For notes on bitfield positions and endianness, see:
+  // https://developer.apple.com/library/mac/documentation/developertools/conceptual/MachORuntime/Reference/reference.html#//apple_ref/doc/uid/20001298-scattered_relocation_entry
+  MRE.Word0 = ((Addr << 0) | (Type << 24) | (Log2Size << 28) | (IsPCRel << 30) |
+               macho::RF_Scattered);
+  MRE.Word1 = Value2;
 }
 
 /// Compute fixup offset (address).
@@ -226,19 +223,18 @@ bool PPCMachObjectWriter::RecordScatteredRelocation(
       report_fatal_error("symbol '" + B->getSymbol().getName() +
                          "' can not be undefined in a subtraction expression");
 
-    // FIXME: is Type correct? see include/llvm/Support/MachO.h
+    // FIXME: is Type correct? see include/llvm/Object/MachOFormat.h
     Value2 = Writer->getSymbolAddress(B_SD, Layout);
     FixedValue -= Writer->getSectionAddress(B_SD->getFragment()->getParent());
   }
   // FIXME: does FixedValue get used??
 
   // Relocations are written out in reverse order, so the PAIR comes first.
-  if (Type == MachO::PPC_RELOC_SECTDIFF ||
-      Type == MachO::PPC_RELOC_HI16_SECTDIFF ||
-      Type == MachO::PPC_RELOC_LO16_SECTDIFF ||
-      Type == MachO::PPC_RELOC_HA16_SECTDIFF ||
-      Type == MachO::PPC_RELOC_LO14_SECTDIFF ||
-      Type == MachO::PPC_RELOC_LOCAL_SECTDIFF) {
+  if (Type == macho::RIT_PPC_SECTDIFF || Type == macho::RIT_PPC_HI16_SECTDIFF ||
+      Type == macho::RIT_PPC_LO16_SECTDIFF ||
+      Type == macho::RIT_PPC_HA16_SECTDIFF ||
+      Type == macho::RIT_PPC_LO14_SECTDIFF ||
+      Type == macho::RIT_PPC_LOCAL_SECTDIFF) {
     // X86 had this piece, but ARM does not
     // If the offset is too large to fit in a scattered relocation,
     // we're hosed. It's an unfortunate limitation of the MachO format.
@@ -257,7 +253,7 @@ bool PPCMachObjectWriter::RecordScatteredRelocation(
     // see PPCMCExpr::EvaluateAsRelocatableImpl()
     uint32_t other_half = 0;
     switch (Type) {
-    case MachO::PPC_RELOC_LO16_SECTDIFF:
+    case macho::RIT_PPC_LO16_SECTDIFF:
       other_half = (FixedValue >> 16) & 0xffff;
       // applyFixupOffset longer extracts the high part because it now assumes
       // this was already done.
@@ -266,12 +262,12 @@ bool PPCMachObjectWriter::RecordScatteredRelocation(
       // So we need to adjust FixedValue again here.
       FixedValue &= 0xffff;
       break;
-    case MachO::PPC_RELOC_HA16_SECTDIFF:
+    case macho::RIT_PPC_HA16_SECTDIFF:
       other_half = FixedValue & 0xffff;
       FixedValue =
           ((FixedValue >> 16) + ((FixedValue & 0x8000) ? 1 : 0)) & 0xffff;
       break;
-    case MachO::PPC_RELOC_HI16_SECTDIFF:
+    case macho::RIT_PPC_HI16_SECTDIFF:
       other_half = FixedValue & 0xffff;
       FixedValue = (FixedValue >> 16) & 0xffff;
       break;
@@ -280,9 +276,9 @@ bool PPCMachObjectWriter::RecordScatteredRelocation(
       break;
     }
 
-    MachO::scattered_relocation_info MRE;
-    makeScatteredRelocationInfo(MRE, other_half, MachO::GENERIC_RELOC_PAIR,
-                                Log2Size, IsPCRel, Value2);
+    macho::RelocationEntry MRE;
+    makeScatteredRelocationInfo(MRE, other_half, macho::RIT_Pair, Log2Size,
+                                IsPCRel, Value2);
     Writer->addRelocation(Fragment->getParent(), MRE);
   } else {
     // If the offset is more than 24-bits, it won't fit in a scattered
@@ -295,7 +291,7 @@ bool PPCMachObjectWriter::RecordScatteredRelocation(
     if (FixupOffset > 0xffffff)
       return false;
   }
-  MachO::scattered_relocation_info MRE;
+  macho::RelocationEntry MRE;
   makeScatteredRelocationInfo(MRE, FixupOffset, Type, Log2Size, IsPCRel, Value);
   Writer->addRelocation(Fragment->getParent(), MRE);
   return true;
@@ -316,8 +312,7 @@ void PPCMachObjectWriter::RecordPPCRelocation(
   // relocations.
   if (Target.getSymB() &&
       // Q: are branch targets ever scattered?
-      RelocType != MachO::PPC_RELOC_BR24 &&
-      RelocType != MachO::PPC_RELOC_BR14) {
+      RelocType != macho::RIT_PPC_BR24 && RelocType != macho::RIT_PPC_BR14) {
     RecordScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup, Target,
                               Log2Size, FixedValue);
     return;
@@ -374,7 +369,8 @@ void PPCMachObjectWriter::RecordPPCRelocation(
       FixedValue -= Writer->getSectionAddress(Fragment->getParent());
   }
 
-  MachO::any_relocation_info MRE;
+  // struct relocation_info (8 bytes)
+  macho::RelocationEntry MRE;
   makeRelocationInfo(MRE, FixupOffset, Index, IsPCRel, Log2Size, IsExtern,
                      Type);
   Writer->addRelocation(Fragment->getParent(), MRE);
diff --git a/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp b/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
index fc3bae3c46..598ddee56d 100644
--- a/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
@@ -19,10 +19,10 @@
 #include "llvm/MC/MCSectionCOFF.h"
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCSectionMachO.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MachO.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
@@ -395,8 +395,8 @@ public:
 
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return createX86MachObjectWriter(OS, /*Is64Bit=*/false,
-                                     MachO::CPU_TYPE_I386,
-                                     MachO::CPU_SUBTYPE_I386_ALL);
+                                     object::mach::CTM_i386,
+                                     object::mach::CSX86_ALL);
   }
 };
 
@@ -409,8 +409,8 @@ public:
 
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return createX86MachObjectWriter(OS, /*Is64Bit=*/true,
-                                     MachO::CPU_TYPE_X86_64,
-                                     MachO::CPU_SUBTYPE_X86_64_ALL);
+                                     object::mach::CTM_x86_64,
+                                     object::mach::CSX86_ALL);
   }
 
   virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
diff --git a/lib/Target/X86/MCTargetDesc/X86MachORelocationInfo.cpp b/lib/Target/X86/MCTargetDesc/X86MachORelocationInfo.cpp
index 209b1d0ee8..75b5acf508 100644
--- a/lib/Target/X86/MCTargetDesc/X86MachORelocationInfo.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MachORelocationInfo.cpp
@@ -17,7 +17,7 @@
 
 using namespace llvm;
 using namespace object;
-using namespace MachO;
+using namespace macho;
 
 namespace {
 class X86_64MachORelocationInfo : public MCRelocationInfo {
@@ -33,7 +33,7 @@ public:
     StringRef SymName; SymI->getName(SymName);
     uint64_t  SymAddr; SymI->getAddress(SymAddr);
 
-    any_relocation_info RE = Obj->getRelocation(Rel.getRawDataRefImpl());
+    RelocationEntry RE = Obj->getRelocation(Rel.getRawDataRefImpl());
     bool isPCRel = Obj->getAnyRelocationPCRel(RE);
 
     MCSymbol *Sym = Ctx.GetOrCreateSymbol(SymName);
@@ -43,44 +43,44 @@ public:
     const MCExpr *Expr = 0;
 
     switch(RelType) {
-    case X86_64_RELOC_TLV:
+    case RIT_X86_64_TLV:
       Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_TLVP, Ctx);
       break;
-    case X86_64_RELOC_SIGNED_4:
+    case RIT_X86_64_Signed4:
       Expr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Sym, Ctx),
                                      MCConstantExpr::Create(4, Ctx),
                                      Ctx);
       break;
-    case X86_64_RELOC_SIGNED_2:
+    case RIT_X86_64_Signed2:
       Expr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Sym, Ctx),
                                      MCConstantExpr::Create(2, Ctx),
                                      Ctx);
       break;
-    case X86_64_RELOC_SIGNED_1:
+    case RIT_X86_64_Signed1:
       Expr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Sym, Ctx),
                                      MCConstantExpr::Create(1, Ctx),
                                      Ctx);
       break;
-    case X86_64_RELOC_GOT_LOAD:
+    case RIT_X86_64_GOTLoad:
       Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Ctx);
       break;
-    case X86_64_RELOC_GOT:
+    case RIT_X86_64_GOT:
       Expr = MCSymbolRefExpr::Create(Sym, isPCRel ?
                                      MCSymbolRefExpr::VK_GOTPCREL :
                                      MCSymbolRefExpr::VK_GOT,
                                      Ctx);
       break;
-    case X86_64_RELOC_SUBTRACTOR:
+    case RIT_X86_64_Subtractor:
       {
         RelocationRef RelNext;
         Obj->getRelocationNext(Rel.getRawDataRefImpl(), RelNext);
-        any_relocation_info RENext = Obj->getRelocation(RelNext.getRawDataRefImpl());
+        RelocationEntry RENext = Obj->getRelocation(RelNext.getRawDataRefImpl());
 
         // X86_64_SUBTRACTOR must be followed by a relocation of type
-        // X86_64_RELOC_UNSIGNED.
+        // X86_64_RELOC_UNSIGNED    .
         // NOTE: Scattered relocations don't exist on x86_64.
         unsigned RType = Obj->getAnyRelocationType(RENext);
-        if (RType != X86_64_RELOC_UNSIGNED)
+        if (RType != RIT_X86_64_Unsigned)
           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
                              "X86_64_RELOC_SUBTRACTOR.");
 
diff --git a/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp b/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp
index 45437e0916..6eff224e26 100644
--- a/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp
@@ -16,11 +16,12 @@
 #include "llvm/MC/MCMachObjectWriter.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCValue.h"
+#include "llvm/Object/MachOFormat.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Format.h"
-#include "llvm/Support/MachO.h"
 
 using namespace llvm;
+using namespace llvm::object;
 
 namespace {
 class X86MachObjectWriter : public MCMachObjectTargetWriter {
@@ -131,7 +132,7 @@ void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer,
 
   if (Target.isAbsolute()) { // constant
     // SymbolNum of 0 indicates the absolute section.
-    Type = MachO::X86_64_RELOC_UNSIGNED;
+    Type = macho::RIT_X86_64_Unsigned;
     Index = 0;
 
     // FIXME: I believe this is broken, I don't think the linker can understand
@@ -140,7 +141,7 @@ void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer,
     // is to use an absolute symbol (which we don't support yet).
     if (IsPCRel) {
       IsExtern = 1;
-      Type = MachO::X86_64_RELOC_BRANCH;
+      Type = macho::RIT_X86_64_Branch;
     }
   } else if (Target.getSymB()) { // A - B + constant
     const MCSymbol *A = &Target.getSymA()->getSymbol();
@@ -192,15 +193,15 @@ void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer,
       Index = A_SD.getFragment()->getParent()->getOrdinal() + 1;
       IsExtern = 0;
     }
-    Type = MachO::X86_64_RELOC_UNSIGNED;
-
-    MachO::relocation_info MRE;
-    MRE.r_address = FixupOffset;
-    MRE.r_symbolnum = Index;
-    MRE.r_pcrel = IsPCRel;
-    MRE.r_length = Log2Size;
-    MRE.r_extern = IsExtern;
-    MRE.r_type = Type;
+    Type = macho::RIT_X86_64_Unsigned;
+
+    macho::RelocationEntry MRE;
+    MRE.Word0 = FixupOffset;
+    MRE.Word1 = ((Index     <<  0) |
+                 (IsPCRel   << 24) |
+                 (Log2Size  << 25) |
+                 (IsExtern  << 27) |
+                 (Type      << 28));
     Writer->addRelocation(Fragment->getParent(), MRE);
 
     if (B_Base) {
@@ -211,7 +212,7 @@ void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer,
       Index = B_SD.getFragment()->getParent()->getOrdinal() + 1;
       IsExtern = 0;
     }
-    Type = MachO::X86_64_RELOC_SUBTRACTOR;
+    Type = macho::RIT_X86_64_Subtractor;
   } else {
     const MCSymbol *Symbol = &Target.getSymA()->getSymbol();
     MCSymbolData &SD = Asm.getSymbolData(*Symbol);
@@ -271,15 +272,15 @@ void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer,
           // rewrite the movq to an leaq at link time if the symbol ends up in
           // the same linkage unit.
           if (unsigned(Fixup.getKind()) == X86::reloc_riprel_4byte_movq_load)
-            Type = MachO::X86_64_RELOC_GOT_LOAD;
+            Type = macho::RIT_X86_64_GOTLoad;
           else
-            Type = MachO::X86_64_RELOC_GOT;
+            Type = macho::RIT_X86_64_GOT;
         }  else if (Modifier == MCSymbolRefExpr::VK_TLVP) {
-          Type = MachO::X86_64_RELOC_TLV;
+          Type = macho::RIT_X86_64_TLV;
         }  else if (Modifier != MCSymbolRefExpr::VK_None) {
           report_fatal_error("unsupported symbol modifier in relocation");
         } else {
-          Type = MachO::X86_64_RELOC_SIGNED;
+          Type = macho::RIT_X86_64_Signed;
 
           // The Darwin x86_64 relocation format has a problem where it cannot
           // encode an address (L<foo> + <constant>) which is outside the atom
@@ -296,9 +297,9 @@ void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer,
           // (the additional bias), but instead appear to just look at the final
           // offset.
           switch (-(Target.getConstant() + (1LL << Log2Size))) {
-          case 1: Type = MachO::X86_64_RELOC_SIGNED_1; break;
-          case 2: Type = MachO::X86_64_RELOC_SIGNED_2; break;
-          case 4: Type = MachO::X86_64_RELOC_SIGNED_4; break;
+          case 1: Type = macho::RIT_X86_64_Signed1; break;
+          case 2: Type = macho::RIT_X86_64_Signed2; break;
+          case 4: Type = macho::RIT_X86_64_Signed4; break;
           }
         }
       } else {
@@ -306,24 +307,24 @@ void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer,
           report_fatal_error("unsupported symbol modifier in branch "
                              "relocation");
 
-        Type = MachO::X86_64_RELOC_BRANCH;
+        Type = macho::RIT_X86_64_Branch;
       }
     } else {
       if (Modifier == MCSymbolRefExpr::VK_GOT) {
-        Type = MachO::X86_64_RELOC_GOT;
+        Type = macho::RIT_X86_64_GOT;
       } else if (Modifier == MCSymbolRefExpr::VK_GOTPCREL) {
         // GOTPCREL is allowed as a modifier on non-PCrel instructions, in which
         // case all we do is set the PCrel bit in the relocation entry; this is
         // used with exception handling, for example. The source is required to
         // include any necessary offset directly.
-        Type = MachO::X86_64_RELOC_GOT;
+        Type = macho::RIT_X86_64_GOT;
         IsPCRel = 1;
       } else if (Modifier == MCSymbolRefExpr::VK_TLVP) {
         report_fatal_error("TLVP symbol modifier should have been rip-rel");
       } else if (Modifier != MCSymbolRefExpr::VK_None)
         report_fatal_error("unsupported symbol modifier in relocation");
       else
-        Type = MachO::X86_64_RELOC_UNSIGNED;
+        Type = macho::RIT_X86_64_Unsigned;
     }
   }
 
@@ -331,13 +332,13 @@ void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer,
   FixedValue = Value;
 
   // struct relocation_info (8 bytes)
-  MachO::relocation_info MRE;
-  MRE.r_address = FixupOffset;
-  MRE.r_symbolnum = Index;
-  MRE.r_pcrel = IsPCRel;
-  MRE.r_length = Log2Size;
-  MRE.r_extern = IsExtern;
-  MRE.r_type = Type;
+  macho::RelocationEntry MRE;
+  MRE.Word0 = FixupOffset;
+  MRE.Word1 = ((Index     <<  0) |
+               (IsPCRel   << 24) |
+               (Log2Size  << 25) |
+               (IsExtern  << 27) |
+               (Type      << 28));
   Writer->addRelocation(Fragment->getParent(), MRE);
 }
 
@@ -351,7 +352,7 @@ bool X86MachObjectWriter::RecordScatteredRelocation(MachObjectWriter *Writer,
                                                     uint64_t &FixedValue) {
   uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset();
   unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind());
-  unsigned Type = MachO::GENERIC_RELOC_VANILLA;
+  unsigned Type = macho::RIT_Vanilla;
 
   // See <reloc.h>.
   const MCSymbol *A = &Target.getSymA()->getSymbol();
@@ -378,16 +379,15 @@ bool X86MachObjectWriter::RecordScatteredRelocation(MachObjectWriter *Writer,
     // Note that there is no longer any semantic difference between these two
     // relocation types from the linkers point of view, this is done solely for
     // pedantic compatibility with 'as'.
-    Type = A_SD->isExternal() ? (unsigned)MachO::GENERIC_RELOC_SECTDIFF :
-      (unsigned)MachO::GENERIC_RELOC_LOCAL_SECTDIFF;
+    Type = A_SD->isExternal() ? (unsigned)macho::RIT_Difference :
+      (unsigned)macho::RIT_Generic_LocalDifference;
     Value2 = Writer->getSymbolAddress(B_SD, Layout);
     FixedValue -= Writer->getSectionAddress(B_SD->getFragment()->getParent());
   }
 
-  MachO::scattered_relocation_info MRE;
   // Relocations are written out in reverse order, so the PAIR comes first.
-  if (Type == MachO::GENERIC_RELOC_SECTDIFF ||
-      Type == MachO::GENERIC_RELOC_LOCAL_SECTDIFF) {
+  if (Type == macho::RIT_Difference ||
+      Type == macho::RIT_Generic_LocalDifference) {
     // If the offset is too large to fit in a scattered relocation,
     // we're hosed. It's an unfortunate limitation of the MachO format.
     if (FixupOffset > 0xffffff) {
@@ -401,12 +401,13 @@ bool X86MachObjectWriter::RecordScatteredRelocation(MachObjectWriter *Writer,
       llvm_unreachable("fatal error returned?!");
     }
 
-    MRE.r_address = 0;
-    MRE.r_type = MachO::GENERIC_RELOC_PAIR;
-    MRE.r_length = Log2Size;
-    MRE.r_pcrel = IsPCRel;
-    MRE.r_scattered = 1;
-    MRE.r_value = Value2;
+    macho::RelocationEntry MRE;
+    MRE.Word0 = ((0         <<  0) |
+                 (macho::RIT_Pair  << 24) |
+                 (Log2Size  << 28) |
+                 (IsPCRel   << 30) |
+                 macho::RF_Scattered);
+    MRE.Word1 = Value2;
     Writer->addRelocation(Fragment->getParent(), MRE);
   } else {
     // If the offset is more than 24-bits, it won't fit in a scattered
@@ -420,12 +421,13 @@ bool X86MachObjectWriter::RecordScatteredRelocation(MachObjectWriter *Writer,
       return false;
   }
 
-  MRE.r_address = FixupOffset;
-  MRE.r_type = Type;
-  MRE.r_length = Log2Size;
-  MRE.r_pcrel = IsPCRel;
-  MRE.r_scattered = 1;
-  MRE.r_value = Value;
+  macho::RelocationEntry MRE;
+  MRE.Word0 = ((FixupOffset <<  0) |
+               (Type        << 24) |
+               (Log2Size    << 28) |
+               (IsPCRel     << 30) |
+               macho::RF_Scattered);
+  MRE.Word1 = Value;
   Writer->addRelocation(Fragment->getParent(), MRE);
   return true;
 }
@@ -467,13 +469,13 @@ void X86MachObjectWriter::RecordTLVPRelocation(MachObjectWriter *Writer,
   }
 
   // struct relocation_info (8 bytes)
-  MachO::relocation_info MRE;
-  MRE.r_address = Value;
-  MRE.r_symbolnum = Index;
-  MRE.r_pcrel = IsPCRel;
-  MRE.r_length = Log2Size;
-  MRE.r_extern = 1;
-  MRE.r_type = MachO::GENERIC_RELOC_TLV;
+  macho::RelocationEntry MRE;
+  MRE.Word0 = Value;
+  MRE.Word1 = ((Index                  <<  0) |
+               (IsPCRel                << 24) |
+               (Log2Size               << 25) |
+               (1                      << 27) | // Extern
+               (macho::RIT_Generic_TLV << 28)); // Type
   Writer->addRelocation(Fragment->getParent(), MRE);
 }
 
@@ -533,7 +535,7 @@ void X86MachObjectWriter::RecordX86Relocation(MachObjectWriter *Writer,
     //
     // FIXME: Currently, these are never generated (see code below). I cannot
     // find a case where they are actually emitted.
-    Type = MachO::GENERIC_RELOC_VANILLA;
+    Type = macho::RIT_Vanilla;
   } else {
     // Resolve constant variables.
     if (SD->getSymbol().isVariable()) {
@@ -564,17 +566,17 @@ void X86MachObjectWriter::RecordX86Relocation(MachObjectWriter *Writer,
     if (IsPCRel)
       FixedValue -= Writer->getSectionAddress(Fragment->getParent());
 
-    Type = MachO::GENERIC_RELOC_VANILLA;
+    Type = macho::RIT_Vanilla;
   }
 
   // struct relocation_info (8 bytes)
-  MachO::relocation_info MRE;
-  MRE.r_address = FixupOffset;
-  MRE.r_symbolnum = Index;
-  MRE.r_pcrel = IsPCRel;
-  MRE.r_length = Log2Size;
-  MRE.r_extern = IsExtern;
-  MRE.r_type = Type;
+  macho::RelocationEntry MRE;
+  MRE.Word0 = FixupOffset;
+  MRE.Word1 = ((Index     <<  0) |
+               (IsPCRel   << 24) |
+               (Log2Size  << 25) |
+               (IsExtern  << 27) |
+               (Type      << 28));
   Writer->addRelocation(Fragment->getParent(), MRE);
 }
 
diff --git a/tools/llvm-objdump/MachODump.cpp b/tools/llvm-objdump/MachODump.cpp
index e78c6443b2..e0ec9cc172 100644
--- a/tools/llvm-objdump/MachODump.cpp
+++ b/tools/llvm-objdump/MachODump.cpp
@@ -104,7 +104,7 @@ static void DumpDataInCode(const char *bytes, uint64_t Size,
   uint64_t Value;
 
   switch (Kind) {
-  case MachO::DICE_KIND_DATA:
+  case macho::Data:
     switch (Size) {
     case 4:
       Value = bytes[3] << 24 |
@@ -125,16 +125,16 @@ static void DumpDataInCode(const char *bytes, uint64_t Size,
     }
     outs() << "\t@ KIND_DATA\n";
     break;
-  case MachO::DICE_KIND_JUMP_TABLE8:
+  case macho::JumpTable8:
     Value = bytes[0];
     outs() << "\t.byte " << Value << "\t@ KIND_JUMP_TABLE8";
     break;
-  case MachO::DICE_KIND_JUMP_TABLE16:
+  case macho::JumpTable16:
     Value = bytes[1] << 8 |
             bytes[0];
     outs() << "\t.short " << Value << "\t@ KIND_JUMP_TABLE16";
     break;
-  case MachO::DICE_KIND_JUMP_TABLE32:
+  case macho::JumpTable32:
     Value = bytes[3] << 24 |
             bytes[2] << 16 |
             bytes[1] << 8 |
@@ -148,7 +148,7 @@ static void DumpDataInCode(const char *bytes, uint64_t Size,
 }
 
 static void
-getSectionsAndSymbols(const MachO::mach_header Header,
+getSectionsAndSymbols(const macho::Header Header,
                       MachOObjectFile *MachOObj,
                       std::vector<SectionRef> &Sections,
                       std::vector<SymbolRef> &Symbols,
@@ -171,26 +171,25 @@ getSectionsAndSymbols(const MachO::mach_header Header,
     MachOObj->getFirstLoadCommandInfo();
   bool BaseSegmentAddressSet = false;
   for (unsigned i = 0; ; ++i) {
-    if (Command.C.cmd == MachO::LC_FUNCTION_STARTS) {
+    if (Command.C.Type == macho::LCT_FunctionStarts) {
       // We found a function starts segment, parse the addresses for later
       // consumption.
-      MachO::linkedit_data_command LLC =
+      macho::LinkeditDataLoadCommand LLC =
         MachOObj->getLinkeditDataLoadCommand(Command);
 
-      MachOObj->ReadULEB128s(LLC.dataoff, FoundFns);
+      MachOObj->ReadULEB128s(LLC.DataOffset, FoundFns);
     }
-    else if (Command.C.cmd == MachO::LC_SEGMENT ||
-             Command.C.cmd == MachO::LC_SEGMENT_64) {
-      MachO::segment_command SLC =
+    else if (Command.C.Type == macho::LCT_Segment) {
+      macho::SegmentLoadCommand SLC =
         MachOObj->getSegmentLoadCommand(Command);
-      StringRef SegName = SLC.segname;
+      StringRef SegName = SLC.Name;
       if(!BaseSegmentAddressSet && SegName != "__PAGEZERO") {
         BaseSegmentAddressSet = true;
-        BaseSegmentAddress = SLC.vmaddr;
+        BaseSegmentAddress = SLC.VMAddress;
       }
     }
 
-    if (i == Header.ncmds - 1)
+    if (i == Header.NumLoadCommands - 1)
       break;
     else
       Command = MachOObj->getNextLoadCommandInfo(Command);
@@ -245,7 +244,7 @@ static void DisassembleInputMachO2(StringRef Filename,
 
   outs() << '\n' << Filename << ":\n\n";
 
-  MachO::mach_header Header = MachOOF->getHeader();
+  macho::Header Header = MachOOF->getHeader();
 
   // FIXME: FoundFns isn't used anymore. Using symbols/LC_FUNCTION_STARTS to
   // determine function locations will eventually go in MCObjectDisassembler.
@@ -268,7 +267,7 @@ static void DisassembleInputMachO2(StringRef Filename,
 
   // Build a data in code table that is sorted on by the address of each entry.
   uint64_t BaseAddress = 0;
-  if (Header.filetype == MachO::MH_OBJECT)
+  if (Header.FileType == macho::HFT_Object)
     Sections[0].getAddress(BaseAddress);
   else
     BaseAddress = BaseSegmentAddress;
diff --git a/tools/llvm-readobj/MachODumper.cpp b/tools/llvm-readobj/MachODumper.cpp
index e27a58aaa4..8df6fd6457 100644
--- a/tools/llvm-readobj/MachODumper.cpp
+++ b/tools/llvm-readobj/MachODumper.cpp
@@ -166,28 +166,28 @@ static void getSection(const MachOObjectFile *Obj,
                        DataRefImpl Sec,
                        MachOSection &Section) {
   if (!Obj->is64Bit()) {
-    MachO::section Sect = Obj->getSection(Sec);
-    Section.Address     = Sect.addr;
-    Section.Size        = Sect.size;
-    Section.Offset      = Sect.offset;
-    Section.Alignment   = Sect.align;
-    Section.RelocationTableOffset = Sect.reloff;
-    Section.NumRelocationTableEntries = Sect.nreloc;
-    Section.Flags       = Sect.flags;
-    Section.Reserved1   = Sect.reserved1;
-    Section.Reserved2   = Sect.reserved2;
+    macho::Section Sect = Obj->getSection(Sec);
+    Section.Address     = Sect.Address;
+    Section.Size        = Sect.Size;
+    Section.Offset      = Sect.Offset;
+    Section.Alignment   = Sect.Align;
+    Section.RelocationTableOffset = Sect.RelocationTableOffset;
+    Section.NumRelocationTableEntries = Sect.NumRelocationTableEntries;
+    Section.Flags       = Sect.Flags;
+    Section.Reserved1   = Sect.Reserved1;
+    Section.Reserved2   = Sect.Reserved2;
     return;
   }
-  MachO::section_64 Sect = Obj->getSection64(Sec);
-  Section.Address     = Sect.addr;
-  Section.Size        = Sect.size;
-  Section.Offset      = Sect.offset;
-  Section.Alignment   = Sect.align;
-  Section.RelocationTableOffset = Sect.reloff;
-  Section.NumRelocationTableEntries = Sect.nreloc;
-  Section.Flags       = Sect.flags;
-  Section.Reserved1   = Sect.reserved1;
-  Section.Reserved2   = Sect.reserved2;
+  macho::Section64 Sect = Obj->getSection64(Sec);
+  Section.Address     = Sect.Address;
+  Section.Size        = Sect.Size;
+  Section.Offset      = Sect.Offset;
+  Section.Alignment   = Sect.Align;
+  Section.RelocationTableOffset = Sect.RelocationTableOffset;
+  Section.NumRelocationTableEntries = Sect.NumRelocationTableEntries;
+  Section.Flags       = Sect.Flags;
+  Section.Reserved1   = Sect.Reserved1;
+  Section.Reserved2   = Sect.Reserved2;
 }
 
 
@@ -195,20 +195,20 @@ static void getSymbol(const MachOObjectFile *Obj,
                       DataRefImpl DRI,
                       MachOSymbol &Symbol) {
   if (!Obj->is64Bit()) {
-    MachO::nlist Entry = Obj->getSymbolTableEntry(DRI);
-    Symbol.StringIndex  = Entry.n_strx;
-    Symbol.Type         = Entry.n_type;
-    Symbol.SectionIndex = Entry.n_sect;
-    Symbol.Flags        = Entry.n_desc;
-    Symbol.Value        = Entry.n_value;
+    macho::SymbolTableEntry Entry = Obj->getSymbolTableEntry(DRI);
+    Symbol.StringIndex  = Entry.StringIndex;
+    Symbol.Type         = Entry.Type;
+    Symbol.SectionIndex = Entry.SectionIndex;
+    Symbol.Flags        = Entry.Flags;
+    Symbol.Value        = Entry.Value;
     return;
   }
-  MachO::nlist_64 Entry = Obj->getSymbol64TableEntry(DRI);
-  Symbol.StringIndex  = Entry.n_strx;
-  Symbol.Type         = Entry.n_type;
-  Symbol.SectionIndex = Entry.n_sect;
-  Symbol.Flags        = Entry.n_desc;
-  Symbol.Value        = Entry.n_value;
+  macho::Symbol64TableEntry Entry = Obj->getSymbol64TableEntry(DRI);
+  Symbol.StringIndex  = Entry.StringIndex;
+  Symbol.Type         = Entry.Type;
+  Symbol.SectionIndex = Entry.SectionIndex;
+  Symbol.Flags        = Entry.Flags;
+  Symbol.Value        = Entry.Value;
 }
 
 void MachODumper::printFileHeaders() {
@@ -349,7 +349,7 @@ void MachODumper::printRelocation(const MachOObjectFile *Obj,
     return;
 
   DataRefImpl DR = RelI->getRawDataRefImpl();
-  MachO::any_relocation_info RE = Obj->getRelocation(DR);
+  macho::RelocationEntry RE = Obj->getRelocation(DR);
   bool IsScattered = Obj->isRelocationScattered(RE);
 
   if (opts::ExpandRelocs) {
diff --git a/tools/macho-dump/macho-dump.cpp b/tools/macho-dump/macho-dump.cpp
index 7ae5440eec..897a785f41 100644
--- a/tools/macho-dump/macho-dump.cpp
+++ b/tools/macho-dump/macho-dump.cpp
@@ -99,10 +99,10 @@ static int DumpSectionData(const MachOObjectFile &Obj, unsigned Index,
   error_code EC;
   for (relocation_iterator I = Obj.getSectionRelBegin(Index),
          E = Obj.getSectionRelEnd(Index); I != E; I.increment(EC), ++RelNum) {
-    MachO::any_relocation_info RE = Obj.getRelocation(I->getRawDataRefImpl());
+    macho::RelocationEntry RE = Obj.getRelocation(I->getRawDataRefImpl());
     outs() << "    # Relocation " << RelNum << "\n";
-    outs() << "    (('word-0', " << format("0x%x", RE.r_word0) << "),\n";
-    outs() << "     ('word-1', " << format("0x%x", RE.r_word1) << ")),\n";
+    outs() << "    (('word-0', " << format("0x%x", RE.Word0) << "),\n";
+    outs() << "     ('word-1', " << format("0x%x", RE.Word1) << ")),\n";
   }
   outs() << "  ])\n";
 
@@ -124,21 +124,23 @@ static int DumpSectionData(const MachOObjectFile &Obj, unsigned Index,
 
 static int DumpSegmentCommand(const MachOObjectFile &Obj,
                               const MachOObjectFile::LoadCommandInfo &LCI) {
-  MachO::segment_command SLC = Obj.getSegmentLoadCommand(LCI);
+  macho::SegmentLoadCommand SLC = Obj.getSegmentLoadCommand(LCI);
 
-  DumpSegmentCommandData(StringRef(SLC.segname, 16), SLC.vmaddr,
-                         SLC.vmsize, SLC.fileoff, SLC.filesize,
-                         SLC.maxprot, SLC.initprot, SLC.nsects, SLC.flags);
+  DumpSegmentCommandData(StringRef(SLC.Name, 16), SLC.VMAddress,
+                         SLC.VMSize, SLC.FileOffset, SLC.FileSize,
+                         SLC.MaxVMProtection, SLC.InitialVMProtection,
+                         SLC.NumSections, SLC.Flags);
 
   // Dump the sections.
   outs() << "  ('sections', [\n";
-  for (unsigned i = 0; i != SLC.nsects; ++i) {
-    MachO::section Sect = Obj.getSection(LCI, i);
-    DumpSectionData(Obj, i, StringRef(Sect.sectname, 16),
-                    StringRef(Sect.segname, 16), Sect.addr,
-                    Sect.size, Sect.offset, Sect.align,
-                    Sect.reloff, Sect.nreloc, Sect.flags,
-                    Sect.reserved1, Sect.reserved2);
+  for (unsigned i = 0; i != SLC.NumSections; ++i) {
+    macho::Section Sect = Obj.getSection(LCI, i);
+    DumpSectionData(Obj, i, StringRef(Sect.Name, 16),
+                    StringRef(Sect.SegmentName, 16), Sect.Address,
+                    Sect.Size, Sect.Offset, Sect.Align,
+                    Sect.RelocationTableOffset,
+                    Sect.NumRelocationTableEntries, Sect.Flags,
+                    Sect.Reserved1, Sect.Reserved2);
   }
   outs() << "  ])\n";
 
@@ -147,22 +149,24 @@ static int DumpSegmentCommand(const MachOObjectFile &Obj,
 
 static int DumpSegment64Command(const MachOObjectFile &Obj,
                                 const MachOObjectFile::LoadCommandInfo &LCI) {
-  MachO::segment_command_64 SLC = Obj.getSegment64LoadCommand(LCI);
-  DumpSegmentCommandData(StringRef(SLC.segname, 16), SLC.vmaddr,
-                         SLC.vmsize, SLC.fileoff, SLC.filesize,
-                         SLC.maxprot, SLC.initprot, SLC.nsects, SLC.flags);
+  macho::Segment64LoadCommand SLC = Obj.getSegment64LoadCommand(LCI);
+  DumpSegmentCommandData(StringRef(SLC.Name, 16), SLC.VMAddress,
+                          SLC.VMSize, SLC.FileOffset, SLC.FileSize,
+                          SLC.MaxVMProtection, SLC.InitialVMProtection,
+                          SLC.NumSections, SLC.Flags);
 
   // Dump the sections.
   outs() << "  ('sections', [\n";
-  for (unsigned i = 0; i != SLC.nsects; ++i) {
-    MachO::section_64 Sect = Obj.getSection64(LCI, i);
-
-    DumpSectionData(Obj, i, StringRef(Sect.sectname, 16),
-                    StringRef(Sect.segname, 16), Sect.addr,
-                    Sect.size, Sect.offset, Sect.align,
-                    Sect.reloff, Sect.nreloc, Sect.flags,
-                    Sect.reserved1, Sect.reserved2,
-                    Sect.reserved3);
+  for (unsigned i = 0; i != SLC.NumSections; ++i) {
+    macho::Section64 Sect = Obj.getSection64(LCI, i);
+
+    DumpSectionData(Obj, i, StringRef(Sect.Name, 16),
+                    StringRef(Sect.SegmentName, 16), Sect.Address,
+                    Sect.Size, Sect.Offset, Sect.Align,
+                    Sect.RelocationTableOffset,
+                    Sect.NumRelocationTableEntries, Sect.Flags,
+                    Sect.Reserved1, Sect.Reserved2,
+                    Sect.Reserved3);
   }
   outs() << "  ])\n";
 
@@ -186,12 +190,12 @@ static void DumpSymbolTableEntryData(const MachOObjectFile &Obj,
 }
 
 static int DumpSymtabCommand(const MachOObjectFile &Obj) {
-  MachO::symtab_command SLC = Obj.getSymtabLoadCommand();
+  macho::SymtabLoadCommand SLC = Obj.getSymtabLoadCommand();
 
-  outs() << "  ('symoff', " << SLC.symoff << ")\n";
-  outs() << "  ('nsyms', " << SLC.nsyms << ")\n";
-  outs() << "  ('stroff', " << SLC.stroff << ")\n";
-  outs() << "  ('strsize', " << SLC.strsize << ")\n";
+  outs() << "  ('symoff', " << SLC.SymbolTableOffset << ")\n";
+  outs() << "  ('nsyms', " << SLC.NumSymbolTableEntries << ")\n";
+  outs() << "  ('stroff', " << SLC.StringTableOffset << ")\n";
+  outs() << "  ('strsize', " << SLC.StringTableSize << ")\n";
 
   // Dump the string data.
   outs() << "  ('_string_data', '";
@@ -207,14 +211,14 @@ static int DumpSymtabCommand(const MachOObjectFile &Obj) {
        I.increment(EC), ++SymNum) {
     DataRefImpl DRI = I->getRawDataRefImpl();
     if (Obj.is64Bit()) {
-      MachO::nlist_64 STE = Obj.getSymbol64TableEntry(DRI);
-      DumpSymbolTableEntryData(Obj, SymNum, STE.n_strx, STE.n_type,
-                               STE.n_sect, STE.n_desc, STE.n_value,
+      macho::Symbol64TableEntry STE = Obj.getSymbol64TableEntry(DRI);
+      DumpSymbolTableEntryData(Obj, SymNum, STE.StringIndex, STE.Type,
+                               STE.SectionIndex, STE.Flags, STE.Value,
                                StringTable);
     } else {
-      MachO::nlist STE = Obj.getSymbolTableEntry(DRI);
-      DumpSymbolTableEntryData(Obj, SymNum, STE.n_strx, STE.n_type,
-                               STE.n_sect, STE.n_desc, STE.n_value,
+      macho::SymbolTableEntry STE = Obj.getSymbolTableEntry(DRI);
+      DumpSymbolTableEntryData(Obj, SymNum, STE.StringIndex, STE.Type,
+                               STE.SectionIndex, STE.Flags, STE.Value,
                                StringTable);
     }
   }
@@ -224,33 +228,37 @@ static int DumpSymtabCommand(const MachOObjectFile &Obj) {
 }
 
 static int DumpDysymtabCommand(const MachOObjectFile &Obj) {
-  MachO::dysymtab_command DLC = Obj.getDysymtabLoadCommand();
-
-  outs() << "  ('ilocalsym', " << DLC.ilocalsym << ")\n";
-  outs() << "  ('nlocalsym', " << DLC.nlocalsym << ")\n";
-  outs() << "  ('iextdefsym', " << DLC.iextdefsym << ")\n";
-  outs() << "  ('nextdefsym', " << DLC.nextdefsym << ")\n";
-  outs() << "  ('iundefsym', " << DLC.iundefsym << ")\n";
-  outs() << "  ('nundefsym', " << DLC.nundefsym << ")\n";
-  outs() << "  ('tocoff', " << DLC.tocoff << ")\n";
-  outs() << "  ('ntoc', " << DLC.ntoc << ")\n";
-  outs() << "  ('modtaboff', " << DLC.modtaboff << ")\n";
-  outs() << "  ('nmodtab', " << DLC.nmodtab << ")\n";
-  outs() << "  ('extrefsymoff', " << DLC.extrefsymoff << ")\n";
-  outs() << "  ('nextrefsyms', " << DLC.nextrefsyms << ")\n";
-  outs() << "  ('indirectsymoff', " << DLC.indirectsymoff << ")\n";
-  outs() << "  ('nindirectsyms', " << DLC.nindirectsyms << ")\n";
-  outs() << "  ('extreloff', " << DLC.extreloff << ")\n";
-  outs() << "  ('nextrel', " << DLC.nextrel << ")\n";
-  outs() << "  ('locreloff', " << DLC.locreloff << ")\n";
-  outs() << "  ('nlocrel', " << DLC.nlocrel << ")\n";
+  macho::DysymtabLoadCommand DLC = Obj.getDysymtabLoadCommand();
+
+  outs() << "  ('ilocalsym', " << DLC.LocalSymbolsIndex << ")\n";
+  outs() << "  ('nlocalsym', " << DLC.NumLocalSymbols << ")\n";
+  outs() << "  ('iextdefsym', " << DLC.ExternalSymbolsIndex << ")\n";
+  outs() << "  ('nextdefsym', " << DLC.NumExternalSymbols << ")\n";
+  outs() << "  ('iundefsym', " << DLC.UndefinedSymbolsIndex << ")\n";
+  outs() << "  ('nundefsym', " << DLC.NumUndefinedSymbols << ")\n";
+  outs() << "  ('tocoff', " << DLC.TOCOffset << ")\n";
+  outs() << "  ('ntoc', " << DLC.NumTOCEntries << ")\n";
+  outs() << "  ('modtaboff', " << DLC.ModuleTableOffset << ")\n";
+  outs() << "  ('nmodtab', " << DLC.NumModuleTableEntries << ")\n";
+  outs() << "  ('extrefsymoff', " << DLC.ReferenceSymbolTableOffset << ")\n";
+  outs() << "  ('nextrefsyms', "
+         << DLC.NumReferencedSymbolTableEntries << ")\n";
+  outs() << "  ('indirectsymoff', " << DLC.IndirectSymbolTableOffset << ")\n";
+  outs() << "  ('nindirectsyms', "
+         << DLC.NumIndirectSymbolTableEntries << ")\n";
+  outs() << "  ('extreloff', " << DLC.ExternalRelocationTableOffset << ")\n";
+  outs() << "  ('nextrel', " << DLC.NumExternalRelocationTableEntries << ")\n";
+  outs() << "  ('locreloff', " << DLC.LocalRelocationTableOffset << ")\n";
+  outs() << "  ('nlocrel', " << DLC.NumLocalRelocationTableEntries << ")\n";
 
   // Dump the indirect symbol table.
   outs() << "  ('_indirect_symbols', [\n";
-  for (unsigned i = 0; i != DLC.nindirectsyms; ++i) {
-    uint32_t ISTE = Obj.getIndirectSymbolTableEntry(DLC, i);
+  for (unsigned i = 0; i != DLC.NumIndirectSymbolTableEntries; ++i) {
+    macho::IndirectSymbolTableEntry ISTE =
+      Obj.getIndirectSymbolTableEntry(DLC, i);
     outs() << "    # Indirect Symbol " << i << "\n";
-    outs() << "    (('symbol_index', " << format("0x%x", ISTE) << "),),\n";
+    outs() << "    (('symbol_index', "
+           << format("0x%x", ISTE.Index) << "),),\n";
   }
   outs() << "  ])\n";
 
@@ -260,13 +268,13 @@ static int DumpDysymtabCommand(const MachOObjectFile &Obj) {
 static int
 DumpLinkeditDataCommand(const MachOObjectFile &Obj,
                         const MachOObjectFile::LoadCommandInfo &LCI) {
-  MachO::linkedit_data_command LLC = Obj.getLinkeditDataLoadCommand(LCI);
-  outs() << "  ('dataoff', " << LLC.dataoff << ")\n"
-         << "  ('datasize', " << LLC.datasize << ")\n"
+  macho::LinkeditDataLoadCommand LLC = Obj.getLinkeditDataLoadCommand(LCI);
+  outs() << "  ('dataoff', " << LLC.DataOffset << ")\n"
+         << "  ('datasize', " << LLC.DataSize << ")\n"
          << "  ('_addresses', [\n";
 
   SmallVector<uint64_t, 8> Addresses;
-  Obj.ReadULEB128s(LLC.dataoff, Addresses);
+  Obj.ReadULEB128s(LLC.DataOffset, Addresses);
   for (unsigned i = 0, e = Addresses.size(); i != e; ++i)
     outs() << "    # Address " << i << '\n'
            << "    ('address', " << format("0x%x", Addresses[i]) << "),\n";
@@ -279,18 +287,19 @@ DumpLinkeditDataCommand(const MachOObjectFile &Obj,
 static int
 DumpDataInCodeDataCommand(const MachOObjectFile &Obj,
                           const MachOObjectFile::LoadCommandInfo &LCI) {
-  MachO::linkedit_data_command LLC = Obj.getLinkeditDataLoadCommand(LCI);
-  outs() << "  ('dataoff', " << LLC.dataoff << ")\n"
-         << "  ('datasize', " << LLC.datasize << ")\n"
+  macho::LinkeditDataLoadCommand LLC = Obj.getLinkeditDataLoadCommand(LCI);
+  outs() << "  ('dataoff', " << LLC.DataOffset << ")\n"
+         << "  ('datasize', " << LLC.DataSize << ")\n"
          << "  ('_data_regions', [\n";
 
-  unsigned NumRegions = LLC.datasize / sizeof(MachO::data_in_code_entry);
+  unsigned NumRegions = LLC.DataSize / sizeof(macho::DataInCodeTableEntry);
   for (unsigned i = 0; i < NumRegions; ++i) {
-    MachO::data_in_code_entry DICE= Obj.getDataInCodeTableEntry(LLC.dataoff, i);
+    macho::DataInCodeTableEntry DICE =
+      Obj.getDataInCodeTableEntry(LLC.DataOffset, i);
     outs() << "    # DICE " << i << "\n"
-           << "    ('offset', " << DICE.offset << ")\n"
-           << "    ('length', " << DICE.length << ")\n"
-           << "    ('kind', " << DICE.kind << ")\n";
+           << "    ('offset', " << DICE.Offset << ")\n"
+           << "    ('length', " << DICE.Length << ")\n"
+           << "    ('kind', " << DICE.Kind << ")\n";
   }
 
   outs() <<"  ])\n";
@@ -301,46 +310,46 @@ DumpDataInCodeDataCommand(const MachOObjectFile &Obj,
 static int
 DumpLinkerOptionsCommand(const MachOObjectFile &Obj,
                          const MachOObjectFile::LoadCommandInfo &LCI) {
-  MachO::linker_options_command LOLC = Obj.getLinkerOptionsLoadCommand(LCI);
-  outs() << "  ('count', " << LOLC.count << ")\n"
-         << "  ('_strings', [\n";
-
-  uint64_t DataSize = LOLC.cmdsize - sizeof(MachO::linker_options_command);
-  const char *P = LCI.Ptr + sizeof(MachO::linker_options_command);
-  StringRef Data(P, DataSize);
-  for (unsigned i = 0; i != LOLC.count; ++i) {
-    std::pair<StringRef,StringRef> Split = Data.split('\0');
-    outs() << "\t\"";
-    outs().write_escaped(Split.first);
-    outs() << "\",\n";
-    Data = Split.second;
-  }
-  outs() <<"  ])\n";
+  macho::LinkerOptionsLoadCommand LOLC = Obj.getLinkerOptionsLoadCommand(LCI);
+   outs() << "  ('count', " << LOLC.Count << ")\n"
+          << "  ('_strings', [\n";
+
+   uint64_t DataSize = LOLC.Size - sizeof(macho::LinkerOptionsLoadCommand);
+   const char *P = LCI.Ptr + sizeof(macho::LinkerOptionsLoadCommand);
+   StringRef Data(P, DataSize);
+   for (unsigned i = 0; i != LOLC.Count; ++i) {
+     std::pair<StringRef,StringRef> Split = Data.split('\0');
+     outs() << "\t\"";
+     outs().write_escaped(Split.first);
+     outs() << "\",\n";
+     Data = Split.second;
+   }
+   outs() <<"  ])\n";
 
   return 0;
 }
 
 static int DumpLoadCommand(const MachOObjectFile &Obj,
                            MachOObjectFile::LoadCommandInfo &LCI) {
-  switch (LCI.C.cmd) {
-  case MachO::LC_SEGMENT:
+  switch (LCI.C.Type) {
+  case macho::LCT_Segment:
     return DumpSegmentCommand(Obj, LCI);
-  case MachO::LC_SEGMENT_64:
+  case macho::LCT_Segment64:
     return DumpSegment64Command(Obj, LCI);
-  case MachO::LC_SYMTAB:
+  case macho::LCT_Symtab:
     return DumpSymtabCommand(Obj);
-  case MachO::LC_DYSYMTAB:
+  case macho::LCT_Dysymtab:
     return DumpDysymtabCommand(Obj);
-  case MachO::LC_CODE_SIGNATURE:
-  case MachO::LC_SEGMENT_SPLIT_INFO:
-  case MachO::LC_FUNCTION_STARTS:
+  case macho::LCT_CodeSignature:
+  case macho::LCT_SegmentSplitInfo:
+  case macho::LCT_FunctionStarts:
     return DumpLinkeditDataCommand(Obj, LCI);
-  case MachO::LC_DATA_IN_CODE:
+  case macho::LCT_DataInCode:
     return DumpDataInCodeDataCommand(Obj, LCI);
-  case MachO::LC_LINKER_OPTIONS:
+  case macho::LCT_LinkerOptions:
     return DumpLinkerOptionsCommand(Obj, LCI);
   default:
-    Warning("unknown load command: " + Twine(LCI.C.cmd));
+    Warning("unknown load command: " + Twine(LCI.C.Type));
     return 0;
   }
 }
@@ -349,27 +358,26 @@ static int DumpLoadCommand(const MachOObjectFile &Obj,
 static int DumpLoadCommand(const MachOObjectFile &Obj, unsigned Index,
                            MachOObjectFile::LoadCommandInfo &LCI) {
   outs() << "  # Load Command " << Index << "\n"
-         << " (('command', " << LCI.C.cmd << ")\n"
-         << "  ('size', " << LCI.C.cmdsize << ")\n";
+         << " (('command', " << LCI.C.Type << ")\n"
+         << "  ('size', " << LCI.C.Size << ")\n";
   int Res = DumpLoadCommand(Obj, LCI);
   outs() << " ),\n";
   return Res;
 }
 
 static void printHeader(const MachOObjectFile *Obj,
-                        const MachO::mach_header &Header) {
-  outs() << "('cputype', " << Header.cputype << ")\n";
-  outs() << "('cpusubtype', " << Header.cpusubtype << ")\n";
-  outs() << "('filetype', " << Header.filetype << ")\n";
-  outs() << "('num_load_commands', " << Header.ncmds << ")\n";
-  outs() << "('load_commands_size', " << Header.sizeofcmds << ")\n";
-  outs() << "('flag', " << Header.flags << ")\n";
+                        const macho::Header &Header) {
+  outs() << "('cputype', " << Header.CPUType << ")\n";
+  outs() << "('cpusubtype', " << Header.CPUSubtype << ")\n";
+  outs() << "('filetype', " << Header.FileType << ")\n";
+  outs() << "('num_load_commands', " << Header.NumLoadCommands << ")\n";
+  outs() << "('load_commands_size', " << Header.SizeOfLoadCommands << ")\n";
+  outs() << "('flag', " << Header.Flags << ")\n";
 
   // Print extended header if 64-bit.
   if (Obj->is64Bit()) {
-    const MachO::mach_header_64 *Header64 =
-      reinterpret_cast<const MachO::mach_header_64 *>(&Header);
-    outs() << "('reserved', " << Header64->reserved << ")\n";
+    macho::Header64Ext Header64Ext = Obj->getHeader64Ext();
+    outs() << "('reserved', " << Header64Ext.Reserved << ")\n";
   }
 }
 
@@ -388,13 +396,8 @@ int main(int argc, char **argv) {
     return Error("Not a MachO object");
 
   // Print the header
-  MachO::mach_header_64 Header64;
-  MachO::mach_header *Header = reinterpret_cast<MachO::mach_header*>(&Header64);
-  if (InputObject->is64Bit())
-    Header64 = InputObject->getHeader64();
-  else
-    *Header = InputObject->getHeader();
-  printHeader(InputObject, *Header);
+  macho::Header Header = InputObject->getHeader();
+  printHeader(InputObject, Header);
 
   // Print the load commands.
   int Res = 0;
@@ -405,7 +408,7 @@ int main(int argc, char **argv) {
     if (DumpLoadCommand(*InputObject, i, Command))
       break;
 
-    if (i == Header->ncmds - 1)
+    if (i == Header.NumLoadCommands - 1)
       break;
     Command = InputObject->getNextLoadCommandInfo(Command);
   }