//===-- llvm/Support/MachO.h - The MachO file format ------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines manifest constants for the MachO object file format.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_MACHO_H
#define LLVM_SUPPORT_MACHO_H

#include "llvm/Support/Compiler.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/Host.h"

namespace llvm {
  namespace MachO {
    // Enums from <mach-o/loader.h>
    enum : uint32_t {
      // Constants for the "magic" field in llvm::MachO::mach_header and
      // llvm::MachO::mach_header_64
      MH_MAGIC    = 0xFEEDFACEu,
      MH_CIGAM    = 0xCEFAEDFEu,
      MH_MAGIC_64 = 0xFEEDFACFu,
      MH_CIGAM_64 = 0xCFFAEDFEu,
      FAT_MAGIC   = 0xCAFEBABEu,
      FAT_CIGAM   = 0xBEBAFECAu
    };

    enum HeaderFileType {
      // Constants for the "filetype" field in llvm::MachO::mach_header and
      // llvm::MachO::mach_header_64
      MH_OBJECT      = 0x1u,
      MH_EXECUTE     = 0x2u,
      MH_FVMLIB      = 0x3u,
      MH_CORE        = 0x4u,
      MH_PRELOAD     = 0x5u,
      MH_DYLIB       = 0x6u,
      MH_DYLINKER    = 0x7u,
      MH_BUNDLE      = 0x8u,
      MH_DYLIB_STUB  = 0x9u,
      MH_DSYM        = 0xAu,
      MH_KEXT_BUNDLE = 0xBu
    };

    enum {
      // Constant bits for the "flags" field in llvm::MachO::mach_header and
      // llvm::MachO::mach_header_64
      MH_NOUNDEFS                = 0x00000001u,
      MH_INCRLINK                = 0x00000002u,
      MH_DYLDLINK                = 0x00000004u,
      MH_BINDATLOAD              = 0x00000008u,
      MH_PREBOUND                = 0x00000010u,
      MH_SPLIT_SEGS              = 0x00000020u,
      MH_LAZY_INIT               = 0x00000040u,
      MH_TWOLEVEL                = 0x00000080u,
      MH_FORCE_FLAT              = 0x00000100u,
      MH_NOMULTIDEFS             = 0x00000200u,
      MH_NOFIXPREBINDING         = 0x00000400u,
      MH_PREBINDABLE             = 0x00000800u,
      MH_ALLMODSBOUND            = 0x00001000u,
      MH_SUBSECTIONS_VIA_SYMBOLS = 0x00002000u,
      MH_CANONICAL               = 0x00004000u,
      MH_WEAK_DEFINES            = 0x00008000u,
      MH_BINDS_TO_WEAK           = 0x00010000u,
      MH_ALLOW_STACK_EXECUTION   = 0x00020000u,
      MH_ROOT_SAFE               = 0x00040000u,
      MH_SETUID_SAFE             = 0x00080000u,
      MH_NO_REEXPORTED_DYLIBS    = 0x00100000u,
      MH_PIE                     = 0x00200000u,
      MH_DEAD_STRIPPABLE_DYLIB   = 0x00400000u,
      MH_HAS_TLV_DESCRIPTORS     = 0x00800000u,
      MH_NO_HEAP_EXECUTION       = 0x01000000u,
      MH_APP_EXTENSION_SAFE      = 0x02000000u
    };

    enum : uint32_t {
      // Flags for the "cmd" field in llvm::MachO::load_command
      LC_REQ_DYLD    = 0x80000000u
    };

    enum LoadCommandType : uint32_t {
      // Constants for the "cmd" field in llvm::MachO::load_command
      LC_SEGMENT              = 0x00000001u,
      LC_SYMTAB               = 0x00000002u,
      LC_SYMSEG               = 0x00000003u,
      LC_THREAD               = 0x00000004u,
      LC_UNIXTHREAD           = 0x00000005u,
      LC_LOADFVMLIB           = 0x00000006u,
      LC_IDFVMLIB             = 0x00000007u,
      LC_IDENT                = 0x00000008u,
      LC_FVMFILE              = 0x00000009u,
      LC_PREPAGE              = 0x0000000Au,
      LC_DYSYMTAB             = 0x0000000Bu,
      LC_LOAD_DYLIB           = 0x0000000Cu,
      LC_ID_DYLIB             = 0x0000000Du,
      LC_LOAD_DYLINKER        = 0x0000000Eu,
      LC_ID_DYLINKER          = 0x0000000Fu,
      LC_PREBOUND_DYLIB       = 0x00000010u,
      LC_ROUTINES             = 0x00000011u,
      LC_SUB_FRAMEWORK        = 0x00000012u,
      LC_SUB_UMBRELLA         = 0x00000013u,
      LC_SUB_CLIENT           = 0x00000014u,
      LC_SUB_LIBRARY          = 0x00000015u,
      LC_TWOLEVEL_HINTS       = 0x00000016u,
      LC_PREBIND_CKSUM        = 0x00000017u,
      LC_LOAD_WEAK_DYLIB      = 0x80000018u,
      LC_SEGMENT_64           = 0x00000019u,
      LC_ROUTINES_64          = 0x0000001Au,
      LC_UUID                 = 0x0000001Bu,
      LC_RPATH                = 0x8000001Cu,
      LC_CODE_SIGNATURE       = 0x0000001Du,
      LC_SEGMENT_SPLIT_INFO   = 0x0000001Eu,
      LC_REEXPORT_DYLIB       = 0x8000001Fu,
      LC_LAZY_LOAD_DYLIB      = 0x00000020u,
      LC_ENCRYPTION_INFO      = 0x00000021u,
      LC_DYLD_INFO            = 0x00000022u,
      LC_DYLD_INFO_ONLY       = 0x80000022u,
      LC_LOAD_UPWARD_DYLIB    = 0x80000023u,
      LC_VERSION_MIN_MACOSX   = 0x00000024u,
      LC_VERSION_MIN_IPHONEOS = 0x00000025u,
      LC_FUNCTION_STARTS      = 0x00000026u,
      LC_DYLD_ENVIRONMENT     = 0x00000027u,
      LC_MAIN                 = 0x80000028u,
      LC_DATA_IN_CODE         = 0x00000029u,
      LC_SOURCE_VERSION       = 0x0000002Au,
      LC_DYLIB_CODE_SIGN_DRS  = 0x0000002Bu,
      LC_ENCRYPTION_INFO_64   = 0x0000002Cu,
      LC_LINKER_OPTION        = 0x0000002Du,
      LC_LINKER_OPTIMIZATION_HINT = 0x0000002Eu,
      LC_VERSION_MIN_TVOS     = 0x0000002Fu,
      LC_VERSION_MIN_WATCHOS  = 0x00000030u,
    };

    enum : uint32_t {
      // Constant bits for the "flags" field in llvm::MachO::segment_command
      SG_HIGHVM              = 0x1u,
      SG_FVMLIB              = 0x2u,
      SG_NORELOC             = 0x4u,
      SG_PROTECTED_VERSION_1 = 0x8u,

      // Constant masks for the "flags" field in llvm::MachO::section and
      // llvm::MachO::section_64
      SECTION_TYPE           = 0x000000ffu, // SECTION_TYPE
      SECTION_ATTRIBUTES     = 0xffffff00u, // SECTION_ATTRIBUTES
      SECTION_ATTRIBUTES_USR = 0xff000000u, // SECTION_ATTRIBUTES_USR
      SECTION_ATTRIBUTES_SYS = 0x00ffff00u  // SECTION_ATTRIBUTES_SYS
    };

    /// These are the section type and attributes fields.  A MachO section can
    /// have only one Type, but can have any of the attributes specified.
    enum SectionType : uint32_t {
      // Constant masks for the "flags[7:0]" field in llvm::MachO::section and
      // llvm::MachO::section_64 (mask "flags" with SECTION_TYPE)

      /// S_REGULAR - Regular section.
      S_REGULAR                             = 0x00u,
      /// S_ZEROFILL - Zero fill on demand section.
      S_ZEROFILL                            = 0x01u,
      /// S_CSTRING_LITERALS - Section with literal C strings.
      S_CSTRING_LITERALS                    = 0x02u,
      /// S_4BYTE_LITERALS - Section with 4 byte literals.
      S_4BYTE_LITERALS                      = 0x03u,
      /// S_8BYTE_LITERALS - Section with 8 byte literals.
      S_8BYTE_LITERALS                      = 0x04u,
      /// S_LITERAL_POINTERS - Section with pointers to literals.
      S_LITERAL_POINTERS                    = 0x05u,
      /// S_NON_LAZY_SYMBOL_POINTERS - Section with non-lazy symbol pointers.
      S_NON_LAZY_SYMBOL_POINTERS            = 0x06u,
      /// S_LAZY_SYMBOL_POINTERS - Section with lazy symbol pointers.
      S_LAZY_SYMBOL_POINTERS                = 0x07u,
      /// S_SYMBOL_STUBS - Section with symbol stubs, byte size of stub in
      /// the Reserved2 field.
      S_SYMBOL_STUBS                        = 0x08u,
      /// S_MOD_INIT_FUNC_POINTERS - Section with only function pointers for
      /// initialization.
      S_MOD_INIT_FUNC_POINTERS              = 0x09u,
      /// S_MOD_TERM_FUNC_POINTERS - Section with only function pointers for
      /// termination.
      S_MOD_TERM_FUNC_POINTERS              = 0x0au,
      /// S_COALESCED - Section contains symbols that are to be coalesced.
      S_COALESCED                           = 0x0bu,
      /// S_GB_ZEROFILL - Zero fill on demand section (that can be larger than 4
      /// gigabytes).
      S_GB_ZEROFILL                         = 0x0cu,
      /// S_INTERPOSING - Section with only pairs of function pointers for
      /// interposing.
      S_INTERPOSING                         = 0x0du,
      /// S_16BYTE_LITERALS - Section with only 16 byte literals.
      S_16BYTE_LITERALS                     = 0x0eu,
      /// S_DTRACE_DOF - Section contains DTrace Object Format.
      S_DTRACE_DOF                          = 0x0fu,
      /// S_LAZY_DYLIB_SYMBOL_POINTERS - Section with lazy symbol pointers to
      /// lazy loaded dylibs.
      S_LAZY_DYLIB_SYMBOL_POINTERS          = 0x10u,
      /// S_THREAD_LOCAL_REGULAR - Thread local data section.
      S_THREAD_LOCAL_REGULAR                = 0x11u,
      /// S_THREAD_LOCAL_ZEROFILL - Thread local zerofill section.
      S_THREAD_LOCAL_ZEROFILL               = 0x12u,
      /// S_THREAD_LOCAL_VARIABLES - Section with thread local variable
      /// structure data.
      S_THREAD_LOCAL_VARIABLES              = 0x13u,
      /// S_THREAD_LOCAL_VARIABLE_POINTERS - Section with pointers to thread
      /// local structures.
      S_THREAD_LOCAL_VARIABLE_POINTERS      = 0x14u,
      /// S_THREAD_LOCAL_INIT_FUNCTION_POINTERS - Section with thread local
      /// variable initialization pointers to functions.
      S_THREAD_LOCAL_INIT_FUNCTION_POINTERS = 0x15u,

      LAST_KNOWN_SECTION_TYPE = S_THREAD_LOCAL_INIT_FUNCTION_POINTERS
    };

    enum : uint32_t {
      // Constant masks for the "flags[31:24]" field in llvm::MachO::section and
      // llvm::MachO::section_64 (mask "flags" with SECTION_ATTRIBUTES_USR)

      /// S_ATTR_PURE_INSTRUCTIONS - Section contains only true machine
      /// instructions.
      S_ATTR_PURE_INSTRUCTIONS   = 0x80000000u,
      /// S_ATTR_NO_TOC - Section contains coalesced symbols that are not to be
      /// in a ranlib table of contents.
      S_ATTR_NO_TOC              = 0x40000000u,
      /// S_ATTR_STRIP_STATIC_SYMS - Ok to strip static symbols in this section
      /// in files with the MY_DYLDLINK flag.
      S_ATTR_STRIP_STATIC_SYMS   = 0x20000000u,
      /// S_ATTR_NO_DEAD_STRIP - No dead stripping.
      S_ATTR_NO_DEAD_STRIP       = 0x10000000u,
      /// S_ATTR_LIVE_SUPPORT - Blocks are live if they reference live blocks.
      S_ATTR_LIVE_SUPPORT        = 0x08000000u,
      /// S_ATTR_SELF_MODIFYING_CODE - Used with i386 code stubs written on by
      /// dyld.
      S_ATTR_SELF_MODIFYING_CODE = 0x04000000u,
      /// S_ATTR_DEBUG - A debug section.
      S_ATTR_DEBUG               = 0x02000000u,

      // Constant masks for the "flags[23:8]" field in llvm::MachO::section and
      // llvm::MachO::section_64 (mask "flags" with SECTION_ATTRIBUTES_SYS)

      /// S_ATTR_SOME_INSTRUCTIONS - Section contains some machine instructions.
      S_ATTR_SOME_INSTRUCTIONS   = 0x00000400u,
      /// S_ATTR_EXT_RELOC - Section has external relocation entries.
      S_ATTR_EXT_RELOC           = 0x00000200u,
      /// S_ATTR_LOC_RELOC - Section has local relocation entries.
      S_ATTR_LOC_RELOC           = 0x00000100u,

      // Constant masks for the value of an indirect symbol in an indirect
      // symbol table
      INDIRECT_SYMBOL_LOCAL = 0x80000000u,
      INDIRECT_SYMBOL_ABS   = 0x40000000u
    };

    enum DataRegionType {
      // Constants for the "kind" field in a data_in_code_entry structure
      DICE_KIND_DATA             = 1u,
      DICE_KIND_JUMP_TABLE8      = 2u,
      DICE_KIND_JUMP_TABLE16     = 3u,
      DICE_KIND_JUMP_TABLE32     = 4u,
      DICE_KIND_ABS_JUMP_TABLE32 = 5u
    };

    enum RebaseType {
      REBASE_TYPE_POINTER         = 1u,
      REBASE_TYPE_TEXT_ABSOLUTE32 = 2u,
      REBASE_TYPE_TEXT_PCREL32    = 3u
    };

    enum {
      REBASE_OPCODE_MASK    = 0xF0u,
      REBASE_IMMEDIATE_MASK = 0x0Fu
    };

    enum RebaseOpcode {
      REBASE_OPCODE_DONE                               = 0x00u,
      REBASE_OPCODE_SET_TYPE_IMM                       = 0x10u,
      REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB        = 0x20u,
      REBASE_OPCODE_ADD_ADDR_ULEB                      = 0x30u,
      REBASE_OPCODE_ADD_ADDR_IMM_SCALED                = 0x40u,
      REBASE_OPCODE_DO_REBASE_IMM_TIMES                = 0x50u,
      REBASE_OPCODE_DO_REBASE_ULEB_TIMES               = 0x60u,
      REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB            = 0x70u,
      REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB = 0x80u
    };

    enum BindType {
      BIND_TYPE_POINTER         = 1u,
      BIND_TYPE_TEXT_ABSOLUTE32 = 2u,
      BIND_TYPE_TEXT_PCREL32    = 3u
    };

    enum BindSpecialDylib {
      BIND_SPECIAL_DYLIB_SELF            =  0,
      BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE = -1,
      BIND_SPECIAL_DYLIB_FLAT_LOOKUP     = -2
    };

    enum {
      BIND_SYMBOL_FLAGS_WEAK_IMPORT         = 0x1u,
      BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION = 0x8u,

      BIND_OPCODE_MASK                      = 0xF0u,
      BIND_IMMEDIATE_MASK                   = 0x0Fu
    };

    enum BindOpcode {
      BIND_OPCODE_DONE                             = 0x00u,
      BIND_OPCODE_SET_DYLIB_ORDINAL_IMM            = 0x10u,
      BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB           = 0x20u,
      BIND_OPCODE_SET_DYLIB_SPECIAL_IMM            = 0x30u,
      BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM    = 0x40u,
      BIND_OPCODE_SET_TYPE_IMM                     = 0x50u,
      BIND_OPCODE_SET_ADDEND_SLEB                  = 0x60u,
      BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB      = 0x70u,
      BIND_OPCODE_ADD_ADDR_ULEB                    = 0x80u,
      BIND_OPCODE_DO_BIND                          = 0x90u,
      BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB            = 0xA0u,
      BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED      = 0xB0u,
      BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB = 0xC0u
    };

    enum {
      EXPORT_SYMBOL_FLAGS_KIND_MASK           = 0x03u,
      EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION     = 0x04u,
      EXPORT_SYMBOL_FLAGS_REEXPORT            = 0x08u,
      EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER   = 0x10u
    };

    enum ExportSymbolKind {
      EXPORT_SYMBOL_FLAGS_KIND_REGULAR        = 0x00u,
      EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL   = 0x01u,
      EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE       = 0x02u
    };

    enum {
      // Constant masks for the "n_type" field in llvm::MachO::nlist and
      // llvm::MachO::nlist_64
      N_STAB = 0xe0,
      N_PEXT = 0x10,
      N_TYPE = 0x0e,
      N_EXT  = 0x01
    };

    enum NListType {
      // Constants for the "n_type & N_TYPE" llvm::MachO::nlist and
      // llvm::MachO::nlist_64
      N_UNDF = 0x0u,
      N_ABS  = 0x2u,
      N_SECT = 0xeu,
      N_PBUD = 0xcu,
      N_INDR = 0xau
    };

    enum SectionOrdinal {
      // Constants for the "n_sect" field in llvm::MachO::nlist and
      // llvm::MachO::nlist_64
      NO_SECT  = 0u,
      MAX_SECT = 0xffu
    };

    enum {
      // Constant masks for the "n_desc" field in llvm::MachO::nlist and
      // llvm::MachO::nlist_64
      // The low 3 bits are the for the REFERENCE_TYPE.
      REFERENCE_TYPE                            = 0x7,
      REFERENCE_FLAG_UNDEFINED_NON_LAZY         = 0,
      REFERENCE_FLAG_UNDEFINED_LAZY             = 1,
      REFERENCE_FLAG_DEFINED                    = 2,
      REFERENCE_FLAG_PRIVATE_DEFINED            = 3,
      REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY = 4,
      REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY     = 5,
      // Flag bits (some overlap with the library ordinal bits).
      N_ARM_THUMB_DEF   = 0x0008u,
      REFERENCED_DYNAMICALLY = 0x0010u,
      N_NO_DEAD_STRIP   = 0x0020u,
      N_WEAK_REF        = 0x0040u,
      N_WEAK_DEF        = 0x0080u,
      N_SYMBOL_RESOLVER = 0x0100u,
      N_ALT_ENTRY       = 0x0200u,
      // For undefined symbols coming from libraries, see GET_LIBRARY_ORDINAL()
      // as these are in the top 8 bits.
      SELF_LIBRARY_ORDINAL   = 0x0,
      MAX_LIBRARY_ORDINAL    = 0xfd,
      DYNAMIC_LOOKUP_ORDINAL = 0xfe,
      EXECUTABLE_ORDINAL     = 0xff
    };

    enum StabType {
      // Constant values for the "n_type" field in llvm::MachO::nlist and
      // llvm::MachO::nlist_64 when "(n_type & N_STAB) != 0"
      N_GSYM    = 0x20u,
      N_FNAME   = 0x22u,
      N_FUN     = 0x24u,
      N_STSYM   = 0x26u,
      N_LCSYM   = 0x28u,
      N_BNSYM   = 0x2Eu,
      N_PC      = 0x30u,
      N_AST     = 0x32u,
      N_OPT     = 0x3Cu,
      N_RSYM    = 0x40u,
      N_SLINE   = 0x44u,
      N_ENSYM   = 0x4Eu,
      N_SSYM    = 0x60u,
      N_SO      = 0x64u,
      N_OSO     = 0x66u,
      N_LSYM    = 0x80u,
      N_BINCL   = 0x82u,
      N_SOL     = 0x84u,
      N_PARAMS  = 0x86u,
      N_VERSION = 0x88u,
      N_OLEVEL  = 0x8Au,
      N_PSYM    = 0xA0u,
      N_EINCL   = 0xA2u,
      N_ENTRY   = 0xA4u,
      N_LBRAC   = 0xC0u,
      N_EXCL    = 0xC2u,
      N_RBRAC   = 0xE0u,
      N_BCOMM   = 0xE2u,
      N_ECOMM   = 0xE4u,
      N_ECOML   = 0xE8u,
      N_LENG    = 0xFEu
    };

    enum : uint32_t {
      // Constant values for the r_symbolnum field in an
      // llvm::MachO::relocation_info structure when r_extern is 0.
      R_ABS = 0,

      // Constant bits for the r_address field in an
      // llvm::MachO::relocation_info structure.
      R_SCATTERED = 0x80000000
    };

    enum RelocationInfoType {
      // Constant values for the r_type field in an
      // llvm::MachO::relocation_info or llvm::MachO::scattered_relocation_info
      // structure.
      GENERIC_RELOC_VANILLA        = 0,
      GENERIC_RELOC_PAIR           = 1,
      GENERIC_RELOC_SECTDIFF       = 2,
      GENERIC_RELOC_PB_LA_PTR      = 3,
      GENERIC_RELOC_LOCAL_SECTDIFF = 4,
      GENERIC_RELOC_TLV            = 5,

      // Constant values for the r_type field in a PowerPC architecture
      // llvm::MachO::relocation_info or llvm::MachO::scattered_relocation_info
      // structure.
      PPC_RELOC_VANILLA            = GENERIC_RELOC_VANILLA,
      PPC_RELOC_PAIR               = GENERIC_RELOC_PAIR,
      PPC_RELOC_BR14               = 2,
      PPC_RELOC_BR24               = 3,
      PPC_RELOC_HI16               = 4,
      PPC_RELOC_LO16               = 5,
      PPC_RELOC_HA16               = 6,
      PPC_RELOC_LO14               = 7,
      PPC_RELOC_SECTDIFF           = 8,
      PPC_RELOC_PB_LA_PTR          = 9,
      PPC_RELOC_HI16_SECTDIFF      = 10,
      PPC_RELOC_LO16_SECTDIFF      = 11,
      PPC_RELOC_HA16_SECTDIFF      = 12,
      PPC_RELOC_JBSR               = 13,
      PPC_RELOC_LO14_SECTDIFF      = 14,
      PPC_RELOC_LOCAL_SECTDIFF     = 15,

      // Constant values for the r_type field in an ARM architecture
      // llvm::MachO::relocation_info or llvm::MachO::scattered_relocation_info
      // structure.
      ARM_RELOC_VANILLA            = GENERIC_RELOC_VANILLA,
      ARM_RELOC_PAIR               = GENERIC_RELOC_PAIR,
      ARM_RELOC_SECTDIFF           = GENERIC_RELOC_SECTDIFF,
      ARM_RELOC_LOCAL_SECTDIFF     = 3,
      ARM_RELOC_PB_LA_PTR          = 4,
      ARM_RELOC_BR24               = 5,
      ARM_THUMB_RELOC_BR22         = 6,
      ARM_THUMB_32BIT_BRANCH       = 7, // obsolete
      ARM_RELOC_HALF               = 8,
      ARM_RELOC_HALF_SECTDIFF      = 9,

      // Constant values for the r_type field in an ARM64 architecture
      // llvm::MachO::relocation_info or llvm::MachO::scattered_relocation_info
      // structure.

      // For pointers.
      ARM64_RELOC_UNSIGNED            = 0,
      // Must be followed by an ARM64_RELOC_UNSIGNED
      ARM64_RELOC_SUBTRACTOR          = 1,
      // A B/BL instruction with 26-bit displacement.
      ARM64_RELOC_BRANCH26            = 2,
      // PC-rel distance to page of target.
      ARM64_RELOC_PAGE21              = 3,
      // Offset within page, scaled by r_length.
      ARM64_RELOC_PAGEOFF12           = 4,
      // PC-rel distance to page of GOT slot.
      ARM64_RELOC_GOT_LOAD_PAGE21     = 5,
      // Offset within page of GOT slot, scaled by r_length.
      ARM64_RELOC_GOT_LOAD_PAGEOFF12  = 6,
      // For pointers to GOT slots.
      ARM64_RELOC_POINTER_TO_GOT      = 7,
      // PC-rel distance to page of TLVP slot.
      ARM64_RELOC_TLVP_LOAD_PAGE21    = 8,
      // Offset within page of TLVP slot, scaled by r_length.
      ARM64_RELOC_TLVP_LOAD_PAGEOFF12 = 9,
      // Must be followed by ARM64_RELOC_PAGE21 or ARM64_RELOC_PAGEOFF12.
      ARM64_RELOC_ADDEND              = 10,

      // Constant values for the r_type field in an x86_64 architecture
      // llvm::MachO::relocation_info or llvm::MachO::scattered_relocation_info
      // structure
      X86_64_RELOC_UNSIGNED        = 0,
      X86_64_RELOC_SIGNED          = 1,
      X86_64_RELOC_BRANCH          = 2,
      X86_64_RELOC_GOT_LOAD        = 3,
      X86_64_RELOC_GOT             = 4,
      X86_64_RELOC_SUBTRACTOR      = 5,
      X86_64_RELOC_SIGNED_1        = 6,
      X86_64_RELOC_SIGNED_2        = 7,
      X86_64_RELOC_SIGNED_4        = 8,
      X86_64_RELOC_TLV             = 9
    };

    // Values for segment_command.initprot.
    // From <mach/vm_prot.h>
    enum {
      VM_PROT_READ    = 0x1,
      VM_PROT_WRITE   = 0x2,
      VM_PROT_EXECUTE = 0x4
    };

    // Structs from <mach-o/loader.h>

    struct mach_header {
      uint32_t magic;
      uint32_t cputype;
      uint32_t cpusubtype;
      uint32_t filetype;
      uint32_t ncmds;
      uint32_t sizeofcmds;
      uint32_t flags;
    };

    struct mach_header_64 {
      uint32_t magic;
      uint32_t cputype;
      uint32_t cpusubtype;
      uint32_t filetype;
      uint32_t ncmds;
      uint32_t sizeofcmds;
      uint32_t flags;
      uint32_t reserved;
    };

    struct load_command {
      uint32_t cmd;
      uint32_t cmdsize;
    };

    struct segment_command {
      uint32_t cmd;
      uint32_t cmdsize;
      char segname[16];
      uint32_t vmaddr;
      uint32_t vmsize;
      uint32_t fileoff;
      uint32_t filesize;
      uint32_t maxprot;
      uint32_t initprot;
      uint32_t nsects;
      uint32_t flags;
    };

    struct segment_command_64 {
      uint32_t cmd;
      uint32_t cmdsize;
      char segname[16];
      uint64_t vmaddr;
      uint64_t vmsize;
      uint64_t fileoff;
      uint64_t filesize;
      uint32_t maxprot;
      uint32_t initprot;
      uint32_t nsects;
      uint32_t flags;
    };

    struct section {
      char sectname[16];
      char segname[16];
      uint32_t addr;
      uint32_t size;
      uint32_t offset;
      uint32_t align;
      uint32_t reloff;
      uint32_t nreloc;
      uint32_t flags;
      uint32_t reserved1;
      uint32_t reserved2;
    };

    struct section_64 {
      char sectname[16];
      char segname[16];
      uint64_t addr;
      uint64_t size;
      uint32_t offset;
      uint32_t align;
      uint32_t reloff;
      uint32_t nreloc;
      uint32_t flags;
      uint32_t reserved1;
      uint32_t reserved2;
      uint32_t reserved3;
    };

    struct fvmlib {
      uint32_t name;
      uint32_t minor_version;
      uint32_t header_addr;
    };

    struct fvmlib_command {
      uint32_t  cmd;
      uint32_t cmdsize;
      struct fvmlib fvmlib;
    };

    struct dylib {
      uint32_t name;
      uint32_t timestamp;
      uint32_t current_version;
      uint32_t compatibility_version;
    };

    struct dylib_command {
      uint32_t cmd;
      uint32_t cmdsize;
      struct dylib dylib;
    };

    struct sub_framework_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t umbrella;
    };

    struct sub_client_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t client;
    };

    struct sub_umbrella_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t sub_umbrella;
    };

    struct sub_library_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t sub_library;
    };

    struct prebound_dylib_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t name;
      uint32_t nmodules;
      uint32_t linked_modules;
    };

    struct dylinker_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t name;
    };

    struct thread_command {
      uint32_t cmd;
      uint32_t cmdsize;
    };

    struct routines_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t init_address;
      uint32_t init_module;
      uint32_t reserved1;
      uint32_t reserved2;
      uint32_t reserved3;
      uint32_t reserved4;
      uint32_t reserved5;
      uint32_t reserved6;
    };

    struct routines_command_64 {
      uint32_t cmd;
      uint32_t cmdsize;
      uint64_t init_address;
      uint64_t init_module;
      uint64_t reserved1;
      uint64_t reserved2;
      uint64_t reserved3;
      uint64_t reserved4;
      uint64_t reserved5;
      uint64_t reserved6;
    };

    struct symtab_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t symoff;
      uint32_t nsyms;
      uint32_t stroff;
      uint32_t strsize;
    };

    struct dysymtab_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t ilocalsym;
      uint32_t nlocalsym;
      uint32_t iextdefsym;
      uint32_t nextdefsym;
      uint32_t iundefsym;
      uint32_t nundefsym;
      uint32_t tocoff;
      uint32_t ntoc;
      uint32_t modtaboff;
      uint32_t nmodtab;
      uint32_t extrefsymoff;
      uint32_t nextrefsyms;
      uint32_t indirectsymoff;
      uint32_t nindirectsyms;
      uint32_t extreloff;
      uint32_t nextrel;
      uint32_t locreloff;
      uint32_t nlocrel;
    };

    struct dylib_table_of_contents {
      uint32_t symbol_index;
      uint32_t module_index;
    };

    struct dylib_module {
      uint32_t module_name;
      uint32_t iextdefsym;
      uint32_t nextdefsym;
      uint32_t irefsym;
      uint32_t nrefsym;
      uint32_t ilocalsym;
      uint32_t nlocalsym;
      uint32_t iextrel;
      uint32_t nextrel;
      uint32_t iinit_iterm;
      uint32_t ninit_nterm;
      uint32_t objc_module_info_addr;
      uint32_t objc_module_info_size;
    };

    struct dylib_module_64 {
      uint32_t module_name;
      uint32_t iextdefsym;
      uint32_t nextdefsym;
      uint32_t irefsym;
      uint32_t nrefsym;
      uint32_t ilocalsym;
      uint32_t nlocalsym;
      uint32_t iextrel;
      uint32_t nextrel;
      uint32_t iinit_iterm;
      uint32_t ninit_nterm;
      uint32_t objc_module_info_size;
      uint64_t objc_module_info_addr;
    };

    struct dylib_reference {
      uint32_t isym:24,
               flags:8;
    };

    struct twolevel_hints_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t offset;
      uint32_t nhints;
    };

    struct twolevel_hint {
      uint32_t isub_image:8,
               itoc:24;
    };

    struct prebind_cksum_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t cksum;
    };

    struct uuid_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint8_t uuid[16];
    };

    struct rpath_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t path;
    };

    struct linkedit_data_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t dataoff;
      uint32_t datasize;
    };

    struct data_in_code_entry {
      uint32_t offset;
      uint16_t length;
      uint16_t kind;
    };

    struct source_version_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint64_t version;
    };

    struct encryption_info_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t cryptoff;
      uint32_t cryptsize;
      uint32_t cryptid;
    };

    struct encryption_info_command_64 {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t cryptoff;
      uint32_t cryptsize;
      uint32_t cryptid;
      uint32_t pad;
    };

    struct version_min_command {
      uint32_t cmd;       // LC_VERSION_MIN_MACOSX or
                          // LC_VERSION_MIN_IPHONEOS
      uint32_t cmdsize;   // sizeof(struct version_min_command)
      uint32_t version;   // X.Y.Z is encoded in nibbles xxxx.yy.zz
      uint32_t sdk;       // X.Y.Z is encoded in nibbles xxxx.yy.zz
    };

    struct dyld_info_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t rebase_off;
      uint32_t rebase_size;
      uint32_t bind_off;
      uint32_t bind_size;
      uint32_t weak_bind_off;
      uint32_t weak_bind_size;
      uint32_t lazy_bind_off;
      uint32_t lazy_bind_size;
      uint32_t export_off;
      uint32_t export_size;
    };

    struct linker_option_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t count;
    };

    struct symseg_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t offset;
      uint32_t size;
    };

    struct ident_command {
      uint32_t cmd;
      uint32_t cmdsize;
    };

    struct fvmfile_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint32_t name;
      uint32_t header_addr;
    };

    struct tlv_descriptor_32 {
      uint32_t thunk;
      uint32_t key;
      uint32_t offset;
    };

    struct tlv_descriptor_64 {
      uint64_t thunk;
      uint64_t key;
      uint64_t offset;
    };

    struct tlv_descriptor {
      uintptr_t thunk;
      uintptr_t key;
      uintptr_t offset;
    };

    struct entry_point_command {
      uint32_t cmd;
      uint32_t cmdsize;
      uint64_t entryoff;
      uint64_t stacksize;
    };

    // Structs from <mach-o/fat.h>
    struct fat_header {
      uint32_t magic;
      uint32_t nfat_arch;
    };

    struct fat_arch {
      uint32_t cputype;
      uint32_t cpusubtype;
      uint32_t offset;
      uint32_t size;
      uint32_t align;
    };

    // Structs from <mach-o/reloc.h>
    struct relocation_info {
      int32_t r_address;
      uint32_t r_symbolnum:24,
               r_pcrel:1,
               r_length:2,
               r_extern:1,
               r_type:4;
    };

    struct scattered_relocation_info {
#if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && (BYTE_ORDER == BIG_ENDIAN)
      uint32_t r_scattered:1,
               r_pcrel:1,
               r_length:2,
               r_type:4,
               r_address:24;
#else
      uint32_t r_address:24,
               r_type:4,
               r_length:2,
               r_pcrel:1,
               r_scattered:1;
#endif
      int32_t r_value;
    };

    // Structs NOT from <mach-o/reloc.h>, but that make LLVM's life easier
    struct any_relocation_info {
      uint32_t r_word0, r_word1;
    };

    // Structs from <mach-o/nlist.h>
    struct nlist_base {
      uint32_t n_strx;
      uint8_t n_type;
      uint8_t n_sect;
      uint16_t n_desc;
    };

    struct nlist {
      uint32_t n_strx;
      uint8_t n_type;
      uint8_t n_sect;
      int16_t n_desc;
      uint32_t n_value;
    };

    struct nlist_64 {
      uint32_t n_strx;
      uint8_t n_type;
      uint8_t n_sect;
      uint16_t n_desc;
      uint64_t n_value;
    };

    // Byte order swapping functions for MachO structs

    inline void swapStruct(mach_header &mh) {
      sys::swapByteOrder(mh.magic);
      sys::swapByteOrder(mh.cputype);
      sys::swapByteOrder(mh.cpusubtype);
      sys::swapByteOrder(mh.filetype);
      sys::swapByteOrder(mh.ncmds);
      sys::swapByteOrder(mh.sizeofcmds);
      sys::swapByteOrder(mh.flags);
    }

    inline void swapStruct(mach_header_64 &H) {
      sys::swapByteOrder(H.magic);
      sys::swapByteOrder(H.cputype);
      sys::swapByteOrder(H.cpusubtype);
      sys::swapByteOrder(H.filetype);
      sys::swapByteOrder(H.ncmds);
      sys::swapByteOrder(H.sizeofcmds);
      sys::swapByteOrder(H.flags);
      sys::swapByteOrder(H.reserved);
    }

    inline void swapStruct(load_command &lc) {
      sys::swapByteOrder(lc.cmd);
      sys::swapByteOrder(lc.cmdsize);
    }

    inline void swapStruct(symtab_command &lc) {
      sys::swapByteOrder(lc.cmd);
      sys::swapByteOrder(lc.cmdsize);
      sys::swapByteOrder(lc.symoff);
      sys::swapByteOrder(lc.nsyms);
      sys::swapByteOrder(lc.stroff);
      sys::swapByteOrder(lc.strsize);
    }

    inline void swapStruct(segment_command_64 &seg) {
      sys::swapByteOrder(seg.cmd);
      sys::swapByteOrder(seg.cmdsize);
      sys::swapByteOrder(seg.vmaddr);
      sys::swapByteOrder(seg.vmsize);
      sys::swapByteOrder(seg.fileoff);
      sys::swapByteOrder(seg.filesize);
      sys::swapByteOrder(seg.maxprot);
      sys::swapByteOrder(seg.initprot);
      sys::swapByteOrder(seg.nsects);
      sys::swapByteOrder(seg.flags);
    }

    inline void swapStruct(segment_command &seg) {
      sys::swapByteOrder(seg.cmd);
      sys::swapByteOrder(seg.cmdsize);
      sys::swapByteOrder(seg.vmaddr);
      sys::swapByteOrder(seg.vmsize);
      sys::swapByteOrder(seg.fileoff);
      sys::swapByteOrder(seg.filesize);
      sys::swapByteOrder(seg.maxprot);
      sys::swapByteOrder(seg.initprot);
      sys::swapByteOrder(seg.nsects);
      sys::swapByteOrder(seg.flags);
    }

    inline void swapStruct(section_64 &sect) {
      sys::swapByteOrder(sect.addr);
      sys::swapByteOrder(sect.size);
      sys::swapByteOrder(sect.offset);
      sys::swapByteOrder(sect.align);
      sys::swapByteOrder(sect.reloff);
      sys::swapByteOrder(sect.nreloc);
      sys::swapByteOrder(sect.flags);
      sys::swapByteOrder(sect.reserved1);
      sys::swapByteOrder(sect.reserved2);
    }

    inline void swapStruct(section &sect) {
      sys::swapByteOrder(sect.addr);
      sys::swapByteOrder(sect.size);
      sys::swapByteOrder(sect.offset);
      sys::swapByteOrder(sect.align);
      sys::swapByteOrder(sect.reloff);
      sys::swapByteOrder(sect.nreloc);
      sys::swapByteOrder(sect.flags);
      sys::swapByteOrder(sect.reserved1);
      sys::swapByteOrder(sect.reserved2);
    }

    inline void swapStruct(dyld_info_command &info) {
      sys::swapByteOrder(info.cmd);
      sys::swapByteOrder(info.cmdsize);
      sys::swapByteOrder(info.rebase_off);
      sys::swapByteOrder(info.rebase_size);
      sys::swapByteOrder(info.bind_off);
      sys::swapByteOrder(info.bind_size);
      sys::swapByteOrder(info.weak_bind_off);
      sys::swapByteOrder(info.weak_bind_size);
      sys::swapByteOrder(info.lazy_bind_off);
      sys::swapByteOrder(info.lazy_bind_size);
      sys::swapByteOrder(info.export_off);
      sys::swapByteOrder(info.export_size);
    }

    inline void swapStruct(dylib_command &d) {
      sys::swapByteOrder(d.cmd);
      sys::swapByteOrder(d.cmdsize);
      sys::swapByteOrder(d.dylib.name);
      sys::swapByteOrder(d.dylib.timestamp);
      sys::swapByteOrder(d.dylib.current_version);
      sys::swapByteOrder(d.dylib.compatibility_version);
    }

    inline void swapStruct(sub_framework_command &s) {
      sys::swapByteOrder(s.cmd);
      sys::swapByteOrder(s.cmdsize);
      sys::swapByteOrder(s.umbrella);
    }

    inline void swapStruct(sub_umbrella_command &s) {
      sys::swapByteOrder(s.cmd);
      sys::swapByteOrder(s.cmdsize);
      sys::swapByteOrder(s.sub_umbrella);
    }

    inline void swapStruct(sub_library_command &s) {
      sys::swapByteOrder(s.cmd);
      sys::swapByteOrder(s.cmdsize);
      sys::swapByteOrder(s.sub_library);
    }

    inline void swapStruct(sub_client_command &s) {
      sys::swapByteOrder(s.cmd);
      sys::swapByteOrder(s.cmdsize);
      sys::swapByteOrder(s.client);
    }

    inline void swapStruct(routines_command &r) {
      sys::swapByteOrder(r.cmd);
      sys::swapByteOrder(r.cmdsize);
      sys::swapByteOrder(r.init_address);
      sys::swapByteOrder(r.init_module);
      sys::swapByteOrder(r.reserved1);
      sys::swapByteOrder(r.reserved2);
      sys::swapByteOrder(r.reserved3);
      sys::swapByteOrder(r.reserved4);
      sys::swapByteOrder(r.reserved5);
      sys::swapByteOrder(r.reserved6);
    }

    inline void swapStruct(routines_command_64 &r) {
      sys::swapByteOrder(r.cmd);
      sys::swapByteOrder(r.cmdsize);
      sys::swapByteOrder(r.init_address);
      sys::swapByteOrder(r.init_module);
      sys::swapByteOrder(r.reserved1);
      sys::swapByteOrder(r.reserved2);
      sys::swapByteOrder(r.reserved3);
      sys::swapByteOrder(r.reserved4);
      sys::swapByteOrder(r.reserved5);
      sys::swapByteOrder(r.reserved6);
    }

    inline void swapStruct(thread_command &t) {
      sys::swapByteOrder(t.cmd);
      sys::swapByteOrder(t.cmdsize);
    }

    inline void swapStruct(dylinker_command &d) {
      sys::swapByteOrder(d.cmd);
      sys::swapByteOrder(d.cmdsize);
      sys::swapByteOrder(d.name);
    }

    inline void swapStruct(uuid_command &u) {
      sys::swapByteOrder(u.cmd);
      sys::swapByteOrder(u.cmdsize);
    }

    inline void swapStruct(rpath_command &r) {
      sys::swapByteOrder(r.cmd);
      sys::swapByteOrder(r.cmdsize);
      sys::swapByteOrder(r.path);
    }

    inline void swapStruct(source_version_command &s) {
      sys::swapByteOrder(s.cmd);
      sys::swapByteOrder(s.cmdsize);
      sys::swapByteOrder(s.version);
    }

    inline void swapStruct(entry_point_command &e) {
      sys::swapByteOrder(e.cmd);
      sys::swapByteOrder(e.cmdsize);
      sys::swapByteOrder(e.entryoff);
      sys::swapByteOrder(e.stacksize);
    }

    inline void swapStruct(encryption_info_command &e) {
      sys::swapByteOrder(e.cmd);
      sys::swapByteOrder(e.cmdsize);
      sys::swapByteOrder(e.cryptoff);
      sys::swapByteOrder(e.cryptsize);
      sys::swapByteOrder(e.cryptid);
    }

    inline void swapStruct(encryption_info_command_64 &e) {
      sys::swapByteOrder(e.cmd);
      sys::swapByteOrder(e.cmdsize);
      sys::swapByteOrder(e.cryptoff);
      sys::swapByteOrder(e.cryptsize);
      sys::swapByteOrder(e.cryptid);
      sys::swapByteOrder(e.pad);
    }

    inline void swapStruct(dysymtab_command &dst) {
      sys::swapByteOrder(dst.cmd);
      sys::swapByteOrder(dst.cmdsize);
      sys::swapByteOrder(dst.ilocalsym);
      sys::swapByteOrder(dst.nlocalsym);
      sys::swapByteOrder(dst.iextdefsym);
      sys::swapByteOrder(dst.nextdefsym);
      sys::swapByteOrder(dst.iundefsym);
      sys::swapByteOrder(dst.nundefsym);
      sys::swapByteOrder(dst.tocoff);
      sys::swapByteOrder(dst.ntoc);
      sys::swapByteOrder(dst.modtaboff);
      sys::swapByteOrder(dst.nmodtab);
      sys::swapByteOrder(dst.extrefsymoff);
      sys::swapByteOrder(dst.nextrefsyms);
      sys::swapByteOrder(dst.indirectsymoff);
      sys::swapByteOrder(dst.nindirectsyms);
      sys::swapByteOrder(dst.extreloff);
      sys::swapByteOrder(dst.nextrel);
      sys::swapByteOrder(dst.locreloff);
      sys::swapByteOrder(dst.nlocrel);
    }

    inline void swapStruct(any_relocation_info &reloc) {
      sys::swapByteOrder(reloc.r_word0);
      sys::swapByteOrder(reloc.r_word1);
    }

    inline void swapStruct(nlist_base &S) {
      sys::swapByteOrder(S.n_strx);
      sys::swapByteOrder(S.n_desc);
    }

    inline void swapStruct(nlist &sym) {
      sys::swapByteOrder(sym.n_strx);
      sys::swapByteOrder(sym.n_desc);
      sys::swapByteOrder(sym.n_value);
    }

    inline void swapStruct(nlist_64 &sym) {
      sys::swapByteOrder(sym.n_strx);
      sys::swapByteOrder(sym.n_desc);
      sys::swapByteOrder(sym.n_value);
    }

    inline void swapStruct(linkedit_data_command &C) {
      sys::swapByteOrder(C.cmd);
      sys::swapByteOrder(C.cmdsize);
      sys::swapByteOrder(C.dataoff);
      sys::swapByteOrder(C.datasize);
    }

    inline void swapStruct(linker_option_command &C) {
      sys::swapByteOrder(C.cmd);
      sys::swapByteOrder(C.cmdsize);
      sys::swapByteOrder(C.count);
    }

    inline void swapStruct(version_min_command&C) {
      sys::swapByteOrder(C.cmd);
      sys::swapByteOrder(C.cmdsize);
      sys::swapByteOrder(C.version);
      sys::swapByteOrder(C.sdk);
    }

    inline void swapStruct(data_in_code_entry &C) {
      sys::swapByteOrder(C.offset);
      sys::swapByteOrder(C.length);
      sys::swapByteOrder(C.kind);
    }

    inline void swapStruct(uint32_t &C) {
      sys::swapByteOrder(C);
    }

    // Get/Set functions from <mach-o/nlist.h>

    static inline uint16_t GET_LIBRARY_ORDINAL(uint16_t n_desc) {
      return (((n_desc) >> 8u) & 0xffu);
    }

    static inline void SET_LIBRARY_ORDINAL(uint16_t &n_desc, uint8_t ordinal) {
      n_desc = (((n_desc) & 0x00ff) | (((ordinal) & 0xff) << 8));
    }

    static inline uint8_t GET_COMM_ALIGN (uint16_t n_desc) {
      return (n_desc >> 8u) & 0x0fu;
    }

    static inline void SET_COMM_ALIGN (uint16_t &n_desc, uint8_t align) {
      n_desc = ((n_desc & 0xf0ffu) | ((align & 0x0fu) << 8u));
    }

    // Enums from <mach/machine.h>
    enum : uint32_t {
      // Capability bits used in the definition of cpu_type.
      CPU_ARCH_MASK  = 0xff000000,   // Mask for architecture bits
      CPU_ARCH_ABI64 = 0x01000000    // 64 bit ABI
    };

    // Constants for the cputype field.
    enum CPUType {
      CPU_TYPE_ANY       = -1,
      CPU_TYPE_X86       = 7,
      CPU_TYPE_I386      = CPU_TYPE_X86,
      CPU_TYPE_X86_64    = CPU_TYPE_X86 | CPU_ARCH_ABI64,
   /* CPU_TYPE_MIPS      = 8, */
      CPU_TYPE_MC98000   = 10, // Old Motorola PowerPC
      CPU_TYPE_ARM       = 12,
      CPU_TYPE_ARM64     = CPU_TYPE_ARM | CPU_ARCH_ABI64,
      CPU_TYPE_SPARC     = 14,
      CPU_TYPE_POWERPC   = 18,
      CPU_TYPE_POWERPC64 = CPU_TYPE_POWERPC | CPU_ARCH_ABI64
    };

    enum : uint32_t {
      // Capability bits used in the definition of cpusubtype.
      CPU_SUBTYPE_MASK  = 0xff000000,   // Mask for architecture bits
      CPU_SUBTYPE_LIB64 = 0x80000000,   // 64 bit libraries

      // Special CPU subtype constants.
      CPU_SUBTYPE_MULTIPLE = ~0u
    };

    // Constants for the cpusubtype field.
    enum CPUSubTypeX86 {
      CPU_SUBTYPE_I386_ALL       = 3,
      CPU_SUBTYPE_386            = 3,
      CPU_SUBTYPE_486            = 4,
      CPU_SUBTYPE_486SX          = 0x84,
      CPU_SUBTYPE_586            = 5,
      CPU_SUBTYPE_PENT           = CPU_SUBTYPE_586,
      CPU_SUBTYPE_PENTPRO        = 0x16,
      CPU_SUBTYPE_PENTII_M3      = 0x36,
      CPU_SUBTYPE_PENTII_M5      = 0x56,
      CPU_SUBTYPE_CELERON        = 0x67,
      CPU_SUBTYPE_CELERON_MOBILE = 0x77,
      CPU_SUBTYPE_PENTIUM_3      = 0x08,
      CPU_SUBTYPE_PENTIUM_3_M    = 0x18,
      CPU_SUBTYPE_PENTIUM_3_XEON = 0x28,
      CPU_SUBTYPE_PENTIUM_M      = 0x09,
      CPU_SUBTYPE_PENTIUM_4      = 0x0a,
      CPU_SUBTYPE_PENTIUM_4_M    = 0x1a,
      CPU_SUBTYPE_ITANIUM        = 0x0b,
      CPU_SUBTYPE_ITANIUM_2      = 0x1b,
      CPU_SUBTYPE_XEON           = 0x0c,
      CPU_SUBTYPE_XEON_MP        = 0x1c,

      CPU_SUBTYPE_X86_ALL     = 3,
      CPU_SUBTYPE_X86_64_ALL  = 3,
      CPU_SUBTYPE_X86_ARCH1   = 4,
      CPU_SUBTYPE_X86_64_H    = 8
    };
    static inline int CPU_SUBTYPE_INTEL(int Family, int Model) {
      return Family | (Model << 4);
    }
    static inline int CPU_SUBTYPE_INTEL_FAMILY(CPUSubTypeX86 ST) {
      return ((int)ST) & 0x0f;
    }
    static inline int CPU_SUBTYPE_INTEL_MODEL(CPUSubTypeX86 ST) {
      return ((int)ST) >> 4;
    }
    enum {
      CPU_SUBTYPE_INTEL_FAMILY_MAX = 15,
      CPU_SUBTYPE_INTEL_MODEL_ALL  = 0
    };

    enum CPUSubTypeARM {
      CPU_SUBTYPE_ARM_ALL     = 0,
      CPU_SUBTYPE_ARM_V4T     = 5,
      CPU_SUBTYPE_ARM_V6      = 6,
      CPU_SUBTYPE_ARM_V5      = 7,
      CPU_SUBTYPE_ARM_V5TEJ   = 7,
      CPU_SUBTYPE_ARM_XSCALE  = 8,
      CPU_SUBTYPE_ARM_V7      = 9,
      //  unused  ARM_V7F     = 10,
      CPU_SUBTYPE_ARM_V7S     = 11,
      CPU_SUBTYPE_ARM_V7K     = 12,
      CPU_SUBTYPE_ARM_V6M     = 14,
      CPU_SUBTYPE_ARM_V7M     = 15,
      CPU_SUBTYPE_ARM_V7EM    = 16
    };

    enum CPUSubTypeARM64 {
      CPU_SUBTYPE_ARM64_ALL   = 0
    };

    enum CPUSubTypeSPARC {
      CPU_SUBTYPE_SPARC_ALL   = 0
    };

    enum CPUSubTypePowerPC {
      CPU_SUBTYPE_POWERPC_ALL   = 0,
      CPU_SUBTYPE_POWERPC_601   = 1,
      CPU_SUBTYPE_POWERPC_602   = 2,
      CPU_SUBTYPE_POWERPC_603   = 3,
      CPU_SUBTYPE_POWERPC_603e  = 4,
      CPU_SUBTYPE_POWERPC_603ev = 5,
      CPU_SUBTYPE_POWERPC_604   = 6,
      CPU_SUBTYPE_POWERPC_604e  = 7,
      CPU_SUBTYPE_POWERPC_620   = 8,
      CPU_SUBTYPE_POWERPC_750   = 9,
      CPU_SUBTYPE_POWERPC_7400  = 10,
      CPU_SUBTYPE_POWERPC_7450  = 11,
      CPU_SUBTYPE_POWERPC_970   = 100,

      CPU_SUBTYPE_MC980000_ALL  = CPU_SUBTYPE_POWERPC_ALL,
      CPU_SUBTYPE_MC98601       = CPU_SUBTYPE_POWERPC_601
    };

    struct x86_thread_state64_t {
      uint64_t rax;
      uint64_t rbx;
      uint64_t rcx;
      uint64_t rdx;
      uint64_t rdi;
      uint64_t rsi;
      uint64_t rbp;
      uint64_t rsp;
      uint64_t r8;
      uint64_t r9;
      uint64_t r10;
      uint64_t r11;
      uint64_t r12;
      uint64_t r13;
      uint64_t r14;
      uint64_t r15;
      uint64_t rip;
      uint64_t rflags;
      uint64_t cs;
      uint64_t fs;
      uint64_t gs;
    };

    enum x86_fp_control_precis {
      x86_FP_PREC_24B = 0,
      x86_FP_PREC_53B = 2,
      x86_FP_PREC_64B = 3
    };

    enum x86_fp_control_rc {
      x86_FP_RND_NEAR = 0,
      x86_FP_RND_DOWN = 1,
      x86_FP_RND_UP = 2,
      x86_FP_CHOP = 3
    };

    struct fp_control_t {
      unsigned short
       invalid :1,
       denorm  :1,
       zdiv    :1,
       ovrfl   :1,
       undfl   :1,
       precis  :1,
               :2,
       pc      :2,
       rc      :2,
               :1,
               :3;
    };

    struct fp_status_t {
      unsigned short
        invalid :1,
        denorm  :1,
        zdiv    :1,
        ovrfl   :1,
        undfl   :1,
        precis  :1,
        stkflt  :1,
        errsumm :1,
        c0      :1,
        c1      :1,
        c2      :1,
        tos     :3,
        c3      :1,
        busy    :1;
    };

    struct mmst_reg_t {
      char mmst_reg[10];
      char mmst_rsrv[6];
    };

    struct xmm_reg_t {
      char xmm_reg[16];
    };

    struct x86_float_state64_t {
      int32_t fpu_reserved[2];
      fp_control_t fpu_fcw;
      fp_status_t fpu_fsw;
      uint8_t fpu_ftw;
      uint8_t fpu_rsrv1;
      uint16_t fpu_fop;
      uint32_t fpu_ip;
      uint16_t fpu_cs;
      uint16_t fpu_rsrv2;
      uint32_t fpu_dp;
      uint16_t fpu_ds;
      uint16_t fpu_rsrv3;
      uint32_t fpu_mxcsr;
      uint32_t fpu_mxcsrmask;
      mmst_reg_t fpu_stmm0;
      mmst_reg_t fpu_stmm1;
      mmst_reg_t fpu_stmm2;
      mmst_reg_t fpu_stmm3;
      mmst_reg_t fpu_stmm4;
      mmst_reg_t fpu_stmm5;
      mmst_reg_t fpu_stmm6;
      mmst_reg_t fpu_stmm7;
      xmm_reg_t fpu_xmm0;
      xmm_reg_t fpu_xmm1;
      xmm_reg_t fpu_xmm2;
      xmm_reg_t fpu_xmm3;
      xmm_reg_t fpu_xmm4;
      xmm_reg_t fpu_xmm5;
      xmm_reg_t fpu_xmm6;
      xmm_reg_t fpu_xmm7;
      xmm_reg_t fpu_xmm8;
      xmm_reg_t fpu_xmm9;
      xmm_reg_t fpu_xmm10;
      xmm_reg_t fpu_xmm11;
      xmm_reg_t fpu_xmm12;
      xmm_reg_t fpu_xmm13;
      xmm_reg_t fpu_xmm14;
      xmm_reg_t fpu_xmm15;
      char fpu_rsrv4[6*16];
      uint32_t fpu_reserved1;
    };

    struct x86_exception_state64_t {
      uint16_t trapno;
      uint16_t cpu;
      uint32_t err;
      uint64_t faultvaddr;
    };

    inline void swapStruct(x86_thread_state64_t &x) {
      sys::swapByteOrder(x.rax);
      sys::swapByteOrder(x.rbx);
      sys::swapByteOrder(x.rcx);
      sys::swapByteOrder(x.rdx);
      sys::swapByteOrder(x.rdi);
      sys::swapByteOrder(x.rsi);
      sys::swapByteOrder(x.rbp);
      sys::swapByteOrder(x.rsp);
      sys::swapByteOrder(x.r8);
      sys::swapByteOrder(x.r9);
      sys::swapByteOrder(x.r10);
      sys::swapByteOrder(x.r11);
      sys::swapByteOrder(x.r12);
      sys::swapByteOrder(x.r13);
      sys::swapByteOrder(x.r14);
      sys::swapByteOrder(x.r15);
      sys::swapByteOrder(x.rip);
      sys::swapByteOrder(x.rflags);
      sys::swapByteOrder(x.cs);
      sys::swapByteOrder(x.fs);
      sys::swapByteOrder(x.gs);
    }

    inline void swapStruct(x86_float_state64_t &x) {
      sys::swapByteOrder(x.fpu_reserved[0]);
      sys::swapByteOrder(x.fpu_reserved[1]);
      // TODO swap: fp_control_t fpu_fcw;
      // TODO swap: fp_status_t fpu_fsw;
      sys::swapByteOrder(x.fpu_fop);
      sys::swapByteOrder(x.fpu_ip);
      sys::swapByteOrder(x.fpu_cs);
      sys::swapByteOrder(x.fpu_rsrv2);
      sys::swapByteOrder(x.fpu_dp);
      sys::swapByteOrder(x.fpu_ds);
      sys::swapByteOrder(x.fpu_rsrv3);
      sys::swapByteOrder(x.fpu_mxcsr);
      sys::swapByteOrder(x.fpu_mxcsrmask);
      sys::swapByteOrder(x.fpu_reserved1);
    }

    inline void swapStruct(x86_exception_state64_t &x) {
      sys::swapByteOrder(x.trapno);
      sys::swapByteOrder(x.cpu);
      sys::swapByteOrder(x.err);
      sys::swapByteOrder(x.faultvaddr);
    }

    struct x86_state_hdr_t {
      uint32_t flavor;
      uint32_t count;
    };

    struct x86_thread_state_t {
      x86_state_hdr_t tsh;
      union {
        x86_thread_state64_t ts64;
      } uts;
    };

    struct x86_float_state_t {
      x86_state_hdr_t fsh;
      union {
        x86_float_state64_t fs64;
      } ufs;
    };

    struct x86_exception_state_t {
      x86_state_hdr_t esh;
      union {
        x86_exception_state64_t es64;
      } ues;
    };

    inline void swapStruct(x86_state_hdr_t &x) {
      sys::swapByteOrder(x.flavor);
      sys::swapByteOrder(x.count);
    }

    enum X86ThreadFlavors {
      x86_THREAD_STATE32    = 1,
      x86_FLOAT_STATE32     = 2,
      x86_EXCEPTION_STATE32 = 3,
      x86_THREAD_STATE64    = 4,
      x86_FLOAT_STATE64     = 5,
      x86_EXCEPTION_STATE64 = 6,
      x86_THREAD_STATE      = 7,
      x86_FLOAT_STATE       = 8,
      x86_EXCEPTION_STATE   = 9,
      x86_DEBUG_STATE32     = 10,
      x86_DEBUG_STATE64     = 11,
      x86_DEBUG_STATE       = 12
    };

    inline void swapStruct(x86_thread_state_t &x) {
      swapStruct(x.tsh);
      if (x.tsh.flavor == x86_THREAD_STATE64)
        swapStruct(x.uts.ts64);
    }

    inline void swapStruct(x86_float_state_t &x) {
      swapStruct(x.fsh);
      if (x.fsh.flavor == x86_FLOAT_STATE64)
        swapStruct(x.ufs.fs64);
    }

    inline void swapStruct(x86_exception_state_t &x) {
      swapStruct(x.esh);
      if (x.esh.flavor == x86_EXCEPTION_STATE64)
        swapStruct(x.ues.es64);
    }

    const uint32_t x86_THREAD_STATE64_COUNT =
      sizeof(x86_thread_state64_t) / sizeof(uint32_t);
    const uint32_t x86_FLOAT_STATE64_COUNT =
      sizeof(x86_float_state64_t) / sizeof(uint32_t);
    const uint32_t x86_EXCEPTION_STATE64_COUNT =
      sizeof(x86_exception_state64_t) / sizeof(uint32_t);

    const uint32_t x86_THREAD_STATE_COUNT =
      sizeof(x86_thread_state_t) / sizeof(uint32_t);
    const uint32_t x86_FLOAT_STATE_COUNT =
      sizeof(x86_float_state_t) / sizeof(uint32_t);
    const uint32_t x86_EXCEPTION_STATE_COUNT =
      sizeof(x86_exception_state_t) / sizeof(uint32_t);

  } // end namespace MachO
} // end namespace llvm

#endif