tools/llvm-readobj/MachODumper.cpp

   1 //===-- MachODump.cpp - Object file dumping utility for llvm --------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the MachO-specific dumper for llvm-readobj.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm-readobj.h"
  15 #include "Error.h"
  16 #include "ObjDumper.h"
  17 #include "StreamWriter.h"
  18 #include "llvm/ADT/SmallString.h"
  19 #include "llvm/ADT/StringExtras.h"
  20 #include "llvm/Object/MachO.h"
  21 #include "llvm/Support/Casting.h"
  22
  23 using namespace llvm;
  24 using namespace object;
  25
  26 namespace {
  27
  28 class MachODumper : public ObjDumper {
  29 public:
  30   MachODumper(const MachOObjectFile *Obj, StreamWriter& Writer)
  31     : ObjDumper(Writer)
  32     , Obj(Obj) { }
  33
  34   void printFileHeaders() override;
  35   void printSections() override;
  36   void printRelocations() override;
  37   void printSymbols() override;
  38   void printDynamicSymbols() override;
  39   void printUnwindInfo() override;
  40
  41 private:
  42   template<class MachHeader>
  43   void printFileHeaders(const MachHeader &Header);
  44
  45   void printSymbol(const SymbolRef &Symbol);
  46
  47   void printRelocation(const RelocationRef &Reloc);
  48
  49   void printRelocation(const MachOObjectFile *Obj, const RelocationRef &Reloc);
  50
  51   void printSections(const MachOObjectFile *Obj);
  52
  53   const MachOObjectFile *Obj;
  54 };
  55
  56 } // namespace
  57
  58
  59 namespace llvm {
  60
  61 std::error_code createMachODumper(const object::ObjectFile *Obj,
  62                                   StreamWriter &Writer,
  63                                   std::unique_ptr<ObjDumper> &Result) {
  64   const MachOObjectFile *MachOObj = dyn_cast<MachOObjectFile>(Obj);
  65   if (!MachOObj)
  66     return readobj_error::unsupported_obj_file_format;
  67
  68   Result.reset(new MachODumper(MachOObj, Writer));
  69   return readobj_error::success;
  70 }
  71
  72 } // namespace llvm
  73
  74 static const EnumEntry<uint32_t> MachOMagics[] = {
  75   { "Magic",      MachO::MH_MAGIC    },
  76   { "Cigam",      MachO::MH_CIGAM    },
  77   { "Magic64",    MachO::MH_MAGIC_64 },
  78   { "Cigam64",    MachO::MH_CIGAM_64 },
  79   { "FatMagic",   MachO::FAT_MAGIC   },
  80   { "FatCigam",   MachO::FAT_CIGAM   },
  81 };
  82
  83 static const EnumEntry<uint32_t> MachOHeaderFileTypes[] = {
  84   { "Relocatable",          MachO::MH_OBJECT      },
  85   { "Executable",           MachO::MH_EXECUTE     },
  86   { "FixedVMLibrary",       MachO::MH_FVMLIB      },
  87   { "Core",                 MachO::MH_CORE        },
  88   { "PreloadedExecutable",  MachO::MH_PRELOAD     },
  89   { "DynamicLibrary",       MachO::MH_DYLIB       },
  90   { "DynamicLinker",        MachO::MH_DYLINKER    },
  91   { "Bundle",               MachO::MH_BUNDLE      },
  92   { "DynamicLibraryStub",   MachO::MH_DYLIB_STUB  },
  93   { "DWARFSymbol",          MachO::MH_DSYM        },
  94   { "KextBundle",           MachO::MH_KEXT_BUNDLE },
  95 };
  96
  97 static const EnumEntry<uint32_t> MachOHeaderCpuTypes[] = {
  98   { "Any"       , static_cast<uint32_t>(MachO::CPU_TYPE_ANY) },
  99   { "X86"       , MachO::CPU_TYPE_X86       },
 100   { "X86-64"    , MachO::CPU_TYPE_X86_64    },
 101   { "Mc98000"   , MachO::CPU_TYPE_MC98000   },
 102   { "Arm"       , MachO::CPU_TYPE_ARM       },
 103   { "Arm64"     , MachO::CPU_TYPE_ARM64     },
 104   { "Sparc"     , MachO::CPU_TYPE_SPARC     },
 105   { "PowerPC"   , MachO::CPU_TYPE_POWERPC   },
 106   { "PowerPC64" , MachO::CPU_TYPE_POWERPC64 },
 107 };
 108
 109 static const EnumEntry<uint32_t> MachOHeaderCpuSubtypesX86[] = {
 110   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_I386_ALL),
 111   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_386),
 112   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_486),
 113   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_486SX),
 114   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_586),
 115   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTPRO),
 116   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTII_M3),
 117   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTII_M5),
 118   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_CELERON),
 119   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_CELERON_MOBILE),
 120   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTIUM_3),
 121   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTIUM_3_M),
 122   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTIUM_3_XEON),
 123   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTIUM_M),
 124   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTIUM_4),
 125   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_PENTIUM_4_M),
 126   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ITANIUM),
 127   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ITANIUM_2),
 128   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_XEON),
 129   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_XEON_MP),
 130 };
 131
 132 static const EnumEntry<uint32_t> MachOHeaderCpuSubtypesX64[] = {
 133   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_X86_64_ALL),
 134   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_X86_ARCH1),
 135   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_X86_64_H),
 136 };
 137
 138 static const EnumEntry<uint32_t> MachOHeaderCpuSubtypesARM[] = {
 139   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_ALL),
 140   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V4T),
 141   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V6),
 142   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V5),
 143   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V5TEJ),
 144   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_XSCALE),
 145   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V7),
 146   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V7S),
 147   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V7K),
 148   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V6M),
 149   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V7M),
 150   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM_V7EM),
 151 };
 152
 153 static const EnumEntry<uint32_t> MachOHeaderCpuSubtypesARM64[] = {
 154   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_ARM64_ALL),
 155 };
 156
 157 static const EnumEntry<uint32_t> MachOHeaderCpuSubtypesSPARC[] = {
 158   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_SPARC_ALL),
 159 };
 160
 161 static const EnumEntry<uint32_t> MachOHeaderCpuSubtypesPPC[] = {
 162   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_ALL),
 163   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_601),
 164   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_602),
 165   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_603),
 166   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_603e),
 167   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_603ev),
 168   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_604),
 169   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_604e),
 170   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_620),
 171   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_750),
 172   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_7400),
 173   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_7450),
 174   LLVM_READOBJ_ENUM_ENT(MachO, CPU_SUBTYPE_POWERPC_970),
 175 };
 176
 177 static const EnumEntry<uint32_t> MachOHeaderFlags[] = {
 178   LLVM_READOBJ_ENUM_ENT(MachO, MH_NOUNDEFS),
 179   LLVM_READOBJ_ENUM_ENT(MachO, MH_INCRLINK),
 180   LLVM_READOBJ_ENUM_ENT(MachO, MH_DYLDLINK),
 181   LLVM_READOBJ_ENUM_ENT(MachO, MH_BINDATLOAD),
 182   LLVM_READOBJ_ENUM_ENT(MachO, MH_PREBOUND),
 183   LLVM_READOBJ_ENUM_ENT(MachO, MH_SPLIT_SEGS),
 184   LLVM_READOBJ_ENUM_ENT(MachO, MH_LAZY_INIT),
 185   LLVM_READOBJ_ENUM_ENT(MachO, MH_TWOLEVEL),
 186   LLVM_READOBJ_ENUM_ENT(MachO, MH_FORCE_FLAT),
 187   LLVM_READOBJ_ENUM_ENT(MachO, MH_NOMULTIDEFS),
 188   LLVM_READOBJ_ENUM_ENT(MachO, MH_NOFIXPREBINDING),
 189   LLVM_READOBJ_ENUM_ENT(MachO, MH_PREBINDABLE),
 190   LLVM_READOBJ_ENUM_ENT(MachO, MH_ALLMODSBOUND),
 191   LLVM_READOBJ_ENUM_ENT(MachO, MH_SUBSECTIONS_VIA_SYMBOLS),
 192   LLVM_READOBJ_ENUM_ENT(MachO, MH_CANONICAL),
 193   LLVM_READOBJ_ENUM_ENT(MachO, MH_WEAK_DEFINES),
 194   LLVM_READOBJ_ENUM_ENT(MachO, MH_BINDS_TO_WEAK),
 195   LLVM_READOBJ_ENUM_ENT(MachO, MH_ALLOW_STACK_EXECUTION),
 196   LLVM_READOBJ_ENUM_ENT(MachO, MH_ROOT_SAFE),
 197   LLVM_READOBJ_ENUM_ENT(MachO, MH_SETUID_SAFE),
 198   LLVM_READOBJ_ENUM_ENT(MachO, MH_NO_REEXPORTED_DYLIBS),
 199   LLVM_READOBJ_ENUM_ENT(MachO, MH_PIE),
 200   LLVM_READOBJ_ENUM_ENT(MachO, MH_DEAD_STRIPPABLE_DYLIB),
 201   LLVM_READOBJ_ENUM_ENT(MachO, MH_HAS_TLV_DESCRIPTORS),
 202   LLVM_READOBJ_ENUM_ENT(MachO, MH_NO_HEAP_EXECUTION),
 203   LLVM_READOBJ_ENUM_ENT(MachO, MH_APP_EXTENSION_SAFE),
 204 };
 205
 206 static const EnumEntry<unsigned> MachOSectionAttributes[] = {
 207   { "LocReloc"         , 1 <<  0 /*S_ATTR_LOC_RELOC          */ },
 208   { "ExtReloc"         , 1 <<  1 /*S_ATTR_EXT_RELOC          */ },
 209   { "SomeInstructions" , 1 <<  2 /*S_ATTR_SOME_INSTRUCTIONS  */ },
 210   { "Debug"            , 1 << 17 /*S_ATTR_DEBUG              */ },
 211   { "SelfModifyingCode", 1 << 18 /*S_ATTR_SELF_MODIFYING_CODE*/ },
 212   { "LiveSupport"      , 1 << 19 /*S_ATTR_LIVE_SUPPORT       */ },
 213   { "NoDeadStrip"      , 1 << 20 /*S_ATTR_NO_DEAD_STRIP      */ },
 214   { "StripStaticSyms"  , 1 << 21 /*S_ATTR_STRIP_STATIC_SYMS  */ },
 215   { "NoTOC"            , 1 << 22 /*S_ATTR_NO_TOC             */ },
 216   { "PureInstructions" , 1 << 23 /*S_ATTR_PURE_INSTRUCTIONS  */ },
 217 };
 218
 219 static const EnumEntry<unsigned> MachOSymbolRefTypes[] = {
 220   { "UndefinedNonLazy",                     0 },
 221   { "ReferenceFlagUndefinedLazy",           1 },
 222   { "ReferenceFlagDefined",                 2 },
 223   { "ReferenceFlagPrivateDefined",          3 },
 224   { "ReferenceFlagPrivateUndefinedNonLazy", 4 },
 225   { "ReferenceFlagPrivateUndefinedLazy",    5 }
 226 };
 227
 228 static const EnumEntry<unsigned> MachOSymbolFlags[] = {
 229   { "ReferencedDynamically", 0x10 },
 230   { "NoDeadStrip",           0x20 },
 231   { "WeakRef",               0x40 },
 232   { "WeakDef",               0x80 }
 233 };
 234
 235 static const EnumEntry<unsigned> MachOSymbolTypes[] = {
 236   { "Undef",           0x0 },
 237   { "Abs",             0x2 },
 238   { "Indirect",        0xA },
 239   { "PreboundUndef",   0xC },
 240   { "Section",         0xE }
 241 };
 242
 243 namespace {
 244   struct MachOSection {
 245     ArrayRef<char> Name;
 246     ArrayRef<char> SegmentName;
 247     uint64_t Address;
 248     uint64_t Size;
 249     uint32_t Offset;
 250     uint32_t Alignment;
 251     uint32_t RelocationTableOffset;
 252     uint32_t NumRelocationTableEntries;
 253     uint32_t Flags;
 254     uint32_t Reserved1;
 255     uint32_t Reserved2;
 256   };
 257
 258   struct MachOSymbol {
 259     uint32_t StringIndex;
 260     uint8_t Type;
 261     uint8_t SectionIndex;
 262     uint16_t Flags;
 263     uint64_t Value;
 264   };
 265 }
 266
 267 static void getSection(const MachOObjectFile *Obj,
 268                        DataRefImpl Sec,
 269                        MachOSection &Section) {
 270   if (!Obj->is64Bit()) {
 271     MachO::section Sect = Obj->getSection(Sec);
 272     Section.Address     = Sect.addr;
 273     Section.Size        = Sect.size;
 274     Section.Offset      = Sect.offset;
 275     Section.Alignment   = Sect.align;
 276     Section.RelocationTableOffset = Sect.reloff;
 277     Section.NumRelocationTableEntries = Sect.nreloc;
 278     Section.Flags       = Sect.flags;
 279     Section.Reserved1   = Sect.reserved1;
 280     Section.Reserved2   = Sect.reserved2;
 281     return;
 282   }
 283   MachO::section_64 Sect = Obj->getSection64(Sec);
 284   Section.Address     = Sect.addr;
 285   Section.Size        = Sect.size;
 286   Section.Offset      = Sect.offset;
 287   Section.Alignment   = Sect.align;
 288   Section.RelocationTableOffset = Sect.reloff;
 289   Section.NumRelocationTableEntries = Sect.nreloc;
 290   Section.Flags       = Sect.flags;
 291   Section.Reserved1   = Sect.reserved1;
 292   Section.Reserved2   = Sect.reserved2;
 293 }
 294
 295
 296 static void getSymbol(const MachOObjectFile *Obj,
 297                       DataRefImpl DRI,
 298                       MachOSymbol &Symbol) {
 299   if (!Obj->is64Bit()) {
 300     MachO::nlist Entry = Obj->getSymbolTableEntry(DRI);
 301     Symbol.StringIndex  = Entry.n_strx;
 302     Symbol.Type         = Entry.n_type;
 303     Symbol.SectionIndex = Entry.n_sect;
 304     Symbol.Flags        = Entry.n_desc;
 305     Symbol.Value        = Entry.n_value;
 306     return;
 307   }
 308   MachO::nlist_64 Entry = Obj->getSymbol64TableEntry(DRI);
 309   Symbol.StringIndex  = Entry.n_strx;
 310   Symbol.Type         = Entry.n_type;
 311   Symbol.SectionIndex = Entry.n_sect;
 312   Symbol.Flags        = Entry.n_desc;
 313   Symbol.Value        = Entry.n_value;
 314 }
 315
 316 void MachODumper::printFileHeaders() {
 317   DictScope H(W, "MachHeader");
 318   if (!Obj->is64Bit()) {
 319     printFileHeaders(Obj->getHeader());
 320   } else {
 321     printFileHeaders(Obj->getHeader64());
 322     W.printHex("Reserved", Obj->getHeader64().reserved);
 323   }
 324 }
 325
 326 template<class MachHeader>
 327 void MachODumper::printFileHeaders(const MachHeader &Header) {
 328   W.printEnum("Magic", Header.magic, makeArrayRef(MachOMagics));
 329   W.printEnum("CpuType", Header.cputype, makeArrayRef(MachOHeaderCpuTypes));
 330   uint32_t subtype = Header.cpusubtype & ~MachO::CPU_SUBTYPE_MASK;
 331   switch (Header.cputype) {
 332   case MachO::CPU_TYPE_X86:
 333     W.printEnum("CpuSubType", subtype, makeArrayRef(MachOHeaderCpuSubtypesX86));
 334     break;
 335   case MachO::CPU_TYPE_X86_64:
 336     W.printEnum("CpuSubType", subtype, makeArrayRef(MachOHeaderCpuSubtypesX64));
 337     break;
 338   case MachO::CPU_TYPE_ARM:
 339     W.printEnum("CpuSubType", subtype, makeArrayRef(MachOHeaderCpuSubtypesARM));
 340     break;
 341   case MachO::CPU_TYPE_POWERPC:
 342     W.printEnum("CpuSubType", subtype, makeArrayRef(MachOHeaderCpuSubtypesPPC));
 343     break;
 344   case MachO::CPU_TYPE_SPARC:
 345     W.printEnum("CpuSubType", subtype, makeArrayRef(MachOHeaderCpuSubtypesSPARC));
 346     break;
 347   case MachO::CPU_TYPE_ARM64:
 348     W.printEnum("CpuSubType", subtype, makeArrayRef(MachOHeaderCpuSubtypesARM64));
 349     break;
 350   case MachO::CPU_TYPE_POWERPC64:
 351   default:
 352     W.printHex("CpuSubtype", subtype);
 353   }
 354   W.printEnum("FileType", Header.filetype, makeArrayRef(MachOHeaderFileTypes));
 355   W.printNumber("NumOfLoadCommands", Header.ncmds);
 356   W.printNumber("SizeOfLoadCommands", Header.sizeofcmds);
 357   W.printFlags("Flags", Header.flags, makeArrayRef(MachOHeaderFlags));
 358 }
 359
 360 void MachODumper::printSections() {
 361   return printSections(Obj);
 362 }
 363
 364 void MachODumper::printSections(const MachOObjectFile *Obj) {
 365   ListScope Group(W, "Sections");
 366
 367   int SectionIndex = -1;
 368   for (const SectionRef &Section : Obj->sections()) {
 369     ++SectionIndex;
 370
 371     MachOSection MOSection;
 372     getSection(Obj, Section.getRawDataRefImpl(), MOSection);
 373     DataRefImpl DR = Section.getRawDataRefImpl();
 374
 375     StringRef Name;
 376     if (error(Section.getName(Name)))
 377       Name = "";
 378
 379     ArrayRef<char> RawName = Obj->getSectionRawName(DR);
 380     StringRef SegmentName = Obj->getSectionFinalSegmentName(DR);
 381     ArrayRef<char> RawSegmentName = Obj->getSectionRawFinalSegmentName(DR);
 382
 383     DictScope SectionD(W, "Section");
 384     W.printNumber("Index", SectionIndex);
 385     W.printBinary("Name", Name, RawName);
 386     W.printBinary("Segment", SegmentName, RawSegmentName);
 387     W.printHex("Address", MOSection.Address);
 388     W.printHex("Size", MOSection.Size);
 389     W.printNumber("Offset", MOSection.Offset);
 390     W.printNumber("Alignment", MOSection.Alignment);
 391     W.printHex("RelocationOffset", MOSection.RelocationTableOffset);
 392     W.printNumber("RelocationCount", MOSection.NumRelocationTableEntries);
 393     W.printEnum("Type", MOSection.Flags & 0xFF,
 394                 makeArrayRef(MachOSectionAttributes));
 395     W.printFlags("Attributes", MOSection.Flags >> 8,
 396                  makeArrayRef(MachOSectionAttributes));
 397     W.printHex("Reserved1", MOSection.Reserved1);
 398     W.printHex("Reserved2", MOSection.Reserved2);
 399
 400     if (opts::SectionRelocations) {
 401       ListScope D(W, "Relocations");
 402       for (const RelocationRef &Reloc : Section.relocations())
 403         printRelocation(Reloc);
 404     }
 405
 406     if (opts::SectionSymbols) {
 407       ListScope D(W, "Symbols");
 408       for (const SymbolRef &Symbol : Obj->symbols()) {
 409         if (!Section.containsSymbol(Symbol))
 410           continue;
 411
 412         printSymbol(Symbol);
 413       }
 414     }
 415
 416     if (opts::SectionData) {
 417       bool IsBSS = Section.isBSS();
 418       if (!IsBSS) {
 419         StringRef Data;
 420         if (error(Section.getContents(Data)))
 421           break;
 422
 423         W.printBinaryBlock("SectionData", Data);
 424       }
 425     }
 426   }
 427 }
 428
 429 void MachODumper::printRelocations() {
 430   ListScope D(W, "Relocations");
 431
 432   std::error_code EC;
 433   for (const SectionRef &Section : Obj->sections()) {
 434     StringRef Name;
 435     if (error(Section.getName(Name)))
 436       continue;
 437
 438     bool PrintedGroup = false;
 439     for (const RelocationRef &Reloc : Section.relocations()) {
 440       if (!PrintedGroup) {
 441         W.startLine() << "Section " << Name << " {\n";
 442         W.indent();
 443         PrintedGroup = true;
 444       }
 445
 446       printRelocation(Reloc);
 447     }
 448
 449     if (PrintedGroup) {
 450       W.unindent();
 451       W.startLine() << "}\n";
 452     }
 453   }
 454 }
 455
 456 void MachODumper::printRelocation(const RelocationRef &Reloc) {
 457   return printRelocation(Obj, Reloc);
 458 }
 459
 460 void MachODumper::printRelocation(const MachOObjectFile *Obj,
 461                                   const RelocationRef &Reloc) {
 462   uint64_t Offset;
 463   SmallString<32> RelocName;
 464   if (error(Reloc.getOffset(Offset)))
 465     return;
 466   if (error(Reloc.getTypeName(RelocName)))
 467     return;
 468
 469   DataRefImpl DR = Reloc.getRawDataRefImpl();
 470   MachO::any_relocation_info RE = Obj->getRelocation(DR);
 471   bool IsScattered = Obj->isRelocationScattered(RE);
 472   bool IsExtern = !IsScattered && Obj->getPlainRelocationExternal(RE);
 473
 474   StringRef TargetName;
 475   if (IsExtern) {
 476     symbol_iterator Symbol = Reloc.getSymbol();
 477     if (Symbol != Obj->symbol_end()) {
 478       if (error(Symbol->getName(TargetName)))
 479         return;
 480     }
 481   } else if (!IsScattered) {
 482     section_iterator SecI = Obj->getRelocationSection(DR);
 483     if (SecI != Obj->section_end()) {
 484       if (error(SecI->getName(TargetName)))
 485         return;
 486     }
 487   }
 488   if (TargetName.empty())
 489     TargetName = "-";
 490
 491   if (opts::ExpandRelocs) {
 492     DictScope Group(W, "Relocation");
 493     W.printHex("Offset", Offset);
 494     W.printNumber("PCRel", Obj->getAnyRelocationPCRel(RE));
 495     W.printNumber("Length", Obj->getAnyRelocationLength(RE));
 496     W.printNumber("Type", RelocName, Obj->getAnyRelocationType(RE));
 497     if (IsScattered) {
 498       W.printHex("Value", Obj->getScatteredRelocationValue(RE));
 499     } else {
 500       const char *Kind = IsExtern ? "Symbol" : "Section";
 501       W.printNumber(Kind, TargetName, Obj->getPlainRelocationSymbolNum(RE));
 502     }
 503   } else {
 504     SmallString<32> SymbolNameOrOffset("0x");
 505     if (IsScattered) {
 506       // Scattered relocations don't really have an associated symbol for some
 507       // reason, even if one exists in the symtab at the correct address.
 508       SymbolNameOrOffset += utohexstr(Obj->getScatteredRelocationValue(RE));
 509     } else {
 510       SymbolNameOrOffset = TargetName;
 511     }
 512
 513     raw_ostream& OS = W.startLine();
 514     OS << W.hex(Offset)
 515        << " " << Obj->getAnyRelocationPCRel(RE)
 516        << " " << Obj->getAnyRelocationLength(RE);
 517     if (IsScattered)
 518       OS << " n/a";
 519     else
 520       OS << " " << Obj->getPlainRelocationExternal(RE);
 521     OS << " " << RelocName
 522        << " " << IsScattered
 523        << " " << SymbolNameOrOffset
 524        << "\n";
 525   }
 526 }
 527
 528 void MachODumper::printSymbols() {
 529   ListScope Group(W, "Symbols");
 530
 531   for (const SymbolRef &Symbol : Obj->symbols()) {
 532     printSymbol(Symbol);
 533   }
 534 }
 535
 536 void MachODumper::printDynamicSymbols() {
 537   ListScope Group(W, "DynamicSymbols");
 538 }
 539
 540 void MachODumper::printSymbol(const SymbolRef &Symbol) {
 541   StringRef SymbolName;
 542   if (Symbol.getName(SymbolName))
 543     SymbolName = "";
 544
 545   MachOSymbol MOSymbol;
 546   getSymbol(Obj, Symbol.getRawDataRefImpl(), MOSymbol);
 547
 548   StringRef SectionName = "";
 549   section_iterator SecI(Obj->section_begin());
 550   if (!error(Symbol.getSection(SecI)) && SecI != Obj->section_end())
 551     error(SecI->getName(SectionName));
 552
 553   DictScope D(W, "Symbol");
 554   W.printNumber("Name", SymbolName, MOSymbol.StringIndex);
 555   if (MOSymbol.Type & MachO::N_STAB) {
 556     W.printHex("Type", "SymDebugTable", MOSymbol.Type);
 557   } else {
 558     if (MOSymbol.Type & MachO::N_PEXT)
 559       W.startLine() << "PrivateExtern\n";
 560     if (MOSymbol.Type & MachO::N_EXT)
 561       W.startLine() << "Extern\n";
 562     W.printEnum("Type", uint8_t(MOSymbol.Type & MachO::N_TYPE),
 563                 makeArrayRef(MachOSymbolTypes));
 564   }
 565   W.printHex("Section", SectionName, MOSymbol.SectionIndex);
 566   W.printEnum("RefType", static_cast<uint16_t>(MOSymbol.Flags & 0xF),
 567               makeArrayRef(MachOSymbolRefTypes));
 568   W.printFlags("Flags", static_cast<uint16_t>(MOSymbol.Flags & ~0xF),
 569                makeArrayRef(MachOSymbolFlags));
 570   W.printHex("Value", MOSymbol.Value);
 571 }
 572
 573 void MachODumper::printUnwindInfo() {
 574   W.startLine() << "UnwindInfo not implemented.\n";
 575 }