lib/Object/MachOObjectFile.cpp

   1 //===- MachOObjectFile.cpp - Mach-O object file binding ---------*- C++ -*-===//
   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 defines the MachOObjectFile class, which binds the MachOObject
  11 // class to the generic ObjectFile wrapper.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/ADT/Triple.h"
  16 #include "llvm/Object/MachOFormat.h"
  17 #include "llvm/Object/MachOObject.h"
  18 #include "llvm/Object/ObjectFile.h"
  19 #include "llvm/Support/MemoryBuffer.h"
  20 #include "llvm/Support/MachO.h"
  21 #include "llvm/ADT/SmallVector.h"
  22
  23 #include <cctype>
  24 #include <cstring>
  25 #include <limits>
  26
  27 using namespace llvm;
  28 using namespace object;
  29
  30 namespace llvm {
  31
  32 typedef MachOObject::LoadCommandInfo LoadCommandInfo;
  33
  34 class MachOObjectFile : public ObjectFile {
  35 public:
  36   MachOObjectFile(MemoryBuffer *Object, MachOObject *MOO, error_code &ec);
  37
  38   virtual symbol_iterator begin_symbols() const;
  39   virtual symbol_iterator end_symbols() const;
  40   virtual section_iterator begin_sections() const;
  41   virtual section_iterator end_sections() const;
  42
  43   virtual uint8_t getBytesInAddress() const;
  44   virtual StringRef getFileFormatName() const;
  45   virtual unsigned getArch() const;
  46
  47 protected:
  48   virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const;
  49   virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const;
  50   virtual error_code getSymbolOffset(DataRefImpl Symb, uint64_t &Res) const;
  51   virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const;
  52   virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const;
  53   virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const;
  54   virtual error_code isSymbolInternal(DataRefImpl Symb, bool &Res) const;
  55   virtual error_code isSymbolGlobal(DataRefImpl Symb, bool &Res) const;
  56   virtual error_code getSymbolType(DataRefImpl Symb, SymbolRef::SymbolType &Res) const;
  57
  58   virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const;
  59   virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const;
  60   virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const;
  61   virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
  62   virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
  63   virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
  64   virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const;
  65   virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const;
  66   virtual error_code sectionContainsSymbol(DataRefImpl DRI, DataRefImpl S,
  67                                            bool &Result) const;
  68   virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const;
  69   virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const;
  70
  71   virtual error_code getRelocationNext(DataRefImpl Rel,
  72                                        RelocationRef &Res) const;
  73   virtual error_code getRelocationAddress(DataRefImpl Rel,
  74                                           uint64_t &Res) const;
  75   virtual error_code getRelocationSymbol(DataRefImpl Rel,
  76                                          SymbolRef &Res) const;
  77   virtual error_code getRelocationType(DataRefImpl Rel,
  78                                        uint32_t &Res) const;
  79   virtual error_code getRelocationTypeName(DataRefImpl Rel,
  80                                            SmallVectorImpl<char> &Result) const;
  81   virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
  82                                                  int64_t &Res) const;
  83   virtual error_code getRelocationValueString(DataRefImpl Rel,
  84                                            SmallVectorImpl<char> &Result) const;
  85
  86 private:
  87   MachOObject *MachOObj;
  88   mutable uint32_t RegisteredStringTable;
  89   typedef SmallVector<DataRefImpl, 1> SectionList;
  90   SectionList Sections;
  91
  92
  93   void moveToNextSection(DataRefImpl &DRI) const;
  94   void getSymbolTableEntry(DataRefImpl DRI,
  95                            InMemoryStruct<macho::SymbolTableEntry> &Res) const;
  96   void getSymbol64TableEntry(DataRefImpl DRI,
  97                           InMemoryStruct<macho::Symbol64TableEntry> &Res) const;
  98   void moveToNextSymbol(DataRefImpl &DRI) const;
  99   void getSection(DataRefImpl DRI, InMemoryStruct<macho::Section> &Res) const;
 100   void getSection64(DataRefImpl DRI,
 101                     InMemoryStruct<macho::Section64> &Res) const;
 102   void getRelocation(DataRefImpl Rel,
 103                      InMemoryStruct<macho::RelocationEntry> &Res) const;
 104   std::size_t getSectionIndex(DataRefImpl Sec) const;
 105 };
 106
 107 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object, MachOObject *MOO,
 108                                  error_code &ec)
 109     : ObjectFile(Binary::isMachO, Object, ec),
 110       MachOObj(MOO),
 111       RegisteredStringTable(std::numeric_limits<uint32_t>::max()) {
 112   DataRefImpl DRI;
 113   DRI.d.a = DRI.d.b = 0;
 114   moveToNextSection(DRI);
 115   uint32_t LoadCommandCount = MachOObj->getHeader().NumLoadCommands;
 116   while (DRI.d.a < LoadCommandCount) {
 117     Sections.push_back(DRI);
 118     DRI.d.b++;
 119     moveToNextSection(DRI);
 120   }
 121 }
 122
 123
 124 ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
 125   error_code ec;
 126   std::string Err;
 127   MachOObject *MachOObj = MachOObject::LoadFromBuffer(Buffer, &Err);
 128   if (!MachOObj)
 129     return NULL;
 130   return new MachOObjectFile(Buffer, MachOObj, ec);
 131 }
 132
 133 /*===-- Symbols -----------------------------------------------------------===*/
 134
 135 void MachOObjectFile::moveToNextSymbol(DataRefImpl &DRI) const {
 136   uint32_t LoadCommandCount = MachOObj->getHeader().NumLoadCommands;
 137   while (DRI.d.a < LoadCommandCount) {
 138     LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 139     if (LCI.Command.Type == macho::LCT_Symtab) {
 140       InMemoryStruct<macho::SymtabLoadCommand> SymtabLoadCmd;
 141       MachOObj->ReadSymtabLoadCommand(LCI, SymtabLoadCmd);
 142       if (DRI.d.b < SymtabLoadCmd->NumSymbolTableEntries)
 143         return;
 144     }
 145
 146     DRI.d.a++;
 147     DRI.d.b = 0;
 148   }
 149 }
 150
 151 void MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI,
 152     InMemoryStruct<macho::SymbolTableEntry> &Res) const {
 153   InMemoryStruct<macho::SymtabLoadCommand> SymtabLoadCmd;
 154   LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 155   MachOObj->ReadSymtabLoadCommand(LCI, SymtabLoadCmd);
 156
 157   if (RegisteredStringTable != DRI.d.a) {
 158     MachOObj->RegisterStringTable(*SymtabLoadCmd);
 159     RegisteredStringTable = DRI.d.a;
 160   }
 161
 162   MachOObj->ReadSymbolTableEntry(SymtabLoadCmd->SymbolTableOffset, DRI.d.b,
 163                                  Res);
 164 }
 165
 166 void MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI,
 167     InMemoryStruct<macho::Symbol64TableEntry> &Res) const {
 168   InMemoryStruct<macho::SymtabLoadCommand> SymtabLoadCmd;
 169   LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 170   MachOObj->ReadSymtabLoadCommand(LCI, SymtabLoadCmd);
 171
 172   if (RegisteredStringTable != DRI.d.a) {
 173     MachOObj->RegisterStringTable(*SymtabLoadCmd);
 174     RegisteredStringTable = DRI.d.a;
 175   }
 176
 177   MachOObj->ReadSymbol64TableEntry(SymtabLoadCmd->SymbolTableOffset, DRI.d.b,
 178                                    Res);
 179 }
 180
 181
 182 error_code MachOObjectFile::getSymbolNext(DataRefImpl DRI,
 183                                           SymbolRef &Result) const {
 184   DRI.d.b++;
 185   moveToNextSymbol(DRI);
 186   Result = SymbolRef(DRI, this);
 187   return object_error::success;
 188 }
 189
 190 error_code MachOObjectFile::getSymbolName(DataRefImpl DRI,
 191                                           StringRef &Result) const {
 192   if (MachOObj->is64Bit()) {
 193     InMemoryStruct<macho::Symbol64TableEntry> Entry;
 194     getSymbol64TableEntry(DRI, Entry);
 195     Result = MachOObj->getStringAtIndex(Entry->StringIndex);
 196   } else {
 197     InMemoryStruct<macho::SymbolTableEntry> Entry;
 198     getSymbolTableEntry(DRI, Entry);
 199     Result = MachOObj->getStringAtIndex(Entry->StringIndex);
 200   }
 201   return object_error::success;
 202 }
 203
 204 error_code MachOObjectFile::getSymbolOffset(DataRefImpl DRI,
 205                                              uint64_t &Result) const {
 206   if (MachOObj->is64Bit()) {
 207     InMemoryStruct<macho::Symbol64TableEntry> Entry;
 208     getSymbol64TableEntry(DRI, Entry);
 209     Result = Entry->Value;
 210   } else {
 211     InMemoryStruct<macho::SymbolTableEntry> Entry;
 212     getSymbolTableEntry(DRI, Entry);
 213     Result = Entry->Value;
 214   }
 215   return object_error::success;
 216 }
 217
 218 error_code MachOObjectFile::getSymbolAddress(DataRefImpl DRI,
 219                                              uint64_t &Result) const {
 220   uint64_t SymbolOffset;
 221   uint8_t SectionIndex;
 222   if (MachOObj->is64Bit()) {
 223     InMemoryStruct<macho::Symbol64TableEntry> Entry;
 224     getSymbol64TableEntry(DRI, Entry);
 225     SymbolOffset = Entry->Value;
 226     SectionIndex = Entry->SectionIndex;
 227   } else {
 228     InMemoryStruct<macho::SymbolTableEntry> Entry;
 229     getSymbolTableEntry(DRI, Entry);
 230     SymbolOffset = Entry->Value;
 231     SectionIndex = Entry->SectionIndex;
 232   }
 233   getSectionAddress(Sections[SectionIndex], Result);
 234   Result += SymbolOffset;
 235
 236   return object_error::success;
 237 }
 238
 239 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
 240                                           uint64_t &Result) const {
 241   Result = UnknownAddressOrSize;
 242   return object_error::success;
 243 }
 244
 245 error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl DRI,
 246                                                 char &Result) const {
 247   uint8_t Type, Flags;
 248   if (MachOObj->is64Bit()) {
 249     InMemoryStruct<macho::Symbol64TableEntry> Entry;
 250     getSymbol64TableEntry(DRI, Entry);
 251     Type = Entry->Type;
 252     Flags = Entry->Flags;
 253   } else {
 254     InMemoryStruct<macho::SymbolTableEntry> Entry;
 255     getSymbolTableEntry(DRI, Entry);
 256     Type = Entry->Type;
 257     Flags = Entry->Flags;
 258   }
 259
 260   char Char;
 261   switch (Type & macho::STF_TypeMask) {
 262     case macho::STT_Undefined:
 263       Char = 'u';
 264       break;
 265     case macho::STT_Absolute:
 266     case macho::STT_Section:
 267       Char = 's';
 268       break;
 269     default:
 270       Char = '?';
 271       break;
 272   }
 273
 274   if (Flags & (macho::STF_External | macho::STF_PrivateExtern))
 275     Char = toupper(Char);
 276   Result = Char;
 277   return object_error::success;
 278 }
 279
 280 error_code MachOObjectFile::isSymbolInternal(DataRefImpl DRI,
 281                                              bool &Result) const {
 282   if (MachOObj->is64Bit()) {
 283     InMemoryStruct<macho::Symbol64TableEntry> Entry;
 284     getSymbol64TableEntry(DRI, Entry);
 285     Result = Entry->Flags & macho::STF_StabsEntryMask;
 286   } else {
 287     InMemoryStruct<macho::SymbolTableEntry> Entry;
 288     getSymbolTableEntry(DRI, Entry);
 289     Result = Entry->Flags & macho::STF_StabsEntryMask;
 290   }
 291   return object_error::success;
 292 }
 293
 294 error_code MachOObjectFile::isSymbolGlobal(DataRefImpl Symb, bool &Res) const {
 295
 296   if (MachOObj->is64Bit()) {
 297     InMemoryStruct<macho::Symbol64TableEntry> Entry;
 298     getSymbol64TableEntry(Symb, Entry);
 299     Res = Entry->Type & MachO::NlistMaskExternal;
 300   } else {
 301     InMemoryStruct<macho::SymbolTableEntry> Entry;
 302     getSymbolTableEntry(Symb, Entry);
 303     Res = Entry->Type & MachO::NlistMaskExternal;
 304   }
 305   return object_error::success;
 306 }
 307
 308 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
 309                                           SymbolRef::SymbolType &Res) const {
 310   uint8_t n_type;
 311   if (MachOObj->is64Bit()) {
 312     InMemoryStruct<macho::Symbol64TableEntry> Entry;
 313     getSymbol64TableEntry(Symb, Entry);
 314     n_type = Entry->Type;
 315   } else {
 316     InMemoryStruct<macho::SymbolTableEntry> Entry;
 317     getSymbolTableEntry(Symb, Entry);
 318     n_type = Entry->Type;
 319   }
 320   Res = SymbolRef::ST_Other;
 321   switch (n_type & MachO::NlistMaskType) {
 322     case MachO::NListTypeUndefined :
 323       Res = SymbolRef::ST_External;
 324       break;
 325     case MachO::NListTypeSection :
 326       Res = SymbolRef::ST_Function;
 327       break;
 328   }
 329   return object_error::success;
 330 }
 331
 332
 333 symbol_iterator MachOObjectFile::begin_symbols() const {
 334   // DRI.d.a = segment number; DRI.d.b = symbol index.
 335   DataRefImpl DRI;
 336   DRI.d.a = DRI.d.b = 0;
 337   moveToNextSymbol(DRI);
 338   return symbol_iterator(SymbolRef(DRI, this));
 339 }
 340
 341 symbol_iterator MachOObjectFile::end_symbols() const {
 342   DataRefImpl DRI;
 343   DRI.d.a = MachOObj->getHeader().NumLoadCommands;
 344   DRI.d.b = 0;
 345   return symbol_iterator(SymbolRef(DRI, this));
 346 }
 347
 348
 349 /*===-- Sections ----------------------------------------------------------===*/
 350
 351 void MachOObjectFile::moveToNextSection(DataRefImpl &DRI) const {
 352   uint32_t LoadCommandCount = MachOObj->getHeader().NumLoadCommands;
 353   while (DRI.d.a < LoadCommandCount) {
 354     LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 355     if (LCI.Command.Type == macho::LCT_Segment) {
 356       InMemoryStruct<macho::SegmentLoadCommand> SegmentLoadCmd;
 357       MachOObj->ReadSegmentLoadCommand(LCI, SegmentLoadCmd);
 358       if (DRI.d.b < SegmentLoadCmd->NumSections)
 359         return;
 360     } else if (LCI.Command.Type == macho::LCT_Segment64) {
 361       InMemoryStruct<macho::Segment64LoadCommand> Segment64LoadCmd;
 362       MachOObj->ReadSegment64LoadCommand(LCI, Segment64LoadCmd);
 363       if (DRI.d.b < Segment64LoadCmd->NumSections)
 364         return;
 365     }
 366
 367     DRI.d.a++;
 368     DRI.d.b = 0;
 369   }
 370 }
 371
 372 error_code MachOObjectFile::getSectionNext(DataRefImpl DRI,
 373                                            SectionRef &Result) const {
 374   DRI.d.b++;
 375   moveToNextSection(DRI);
 376   Result = SectionRef(DRI, this);
 377   return object_error::success;
 378 }
 379
 380 void
 381 MachOObjectFile::getSection(DataRefImpl DRI,
 382                             InMemoryStruct<macho::Section> &Res) const {
 383   InMemoryStruct<macho::SegmentLoadCommand> SLC;
 384   LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 385   MachOObj->ReadSegmentLoadCommand(LCI, SLC);
 386   MachOObj->ReadSection(LCI, DRI.d.b, Res);
 387 }
 388
 389 std::size_t MachOObjectFile::getSectionIndex(DataRefImpl Sec) const {
 390   SectionList::const_iterator loc =
 391     std::find(Sections.begin(), Sections.end(), Sec);
 392   assert(loc != Sections.end() && "Sec is not a valid section!");
 393   return std::distance(Sections.begin(), loc);
 394 }
 395
 396 void
 397 MachOObjectFile::getSection64(DataRefImpl DRI,
 398                             InMemoryStruct<macho::Section64> &Res) const {
 399   InMemoryStruct<macho::Segment64LoadCommand> SLC;
 400   LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 401   MachOObj->ReadSegment64LoadCommand(LCI, SLC);
 402   MachOObj->ReadSection64(LCI, DRI.d.b, Res);
 403 }
 404
 405 static bool is64BitLoadCommand(const MachOObject *MachOObj, DataRefImpl DRI) {
 406   LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 407   if (LCI.Command.Type == macho::LCT_Segment64)
 408     return true;
 409   assert(LCI.Command.Type == macho::LCT_Segment && "Unexpected Type.");
 410   return false;
 411 }
 412
 413 error_code MachOObjectFile::getSectionName(DataRefImpl DRI,
 414                                            StringRef &Result) const {
 415   // FIXME: thread safety.
 416   static char result[34];
 417   if (is64BitLoadCommand(MachOObj, DRI)) {
 418     InMemoryStruct<macho::Segment64LoadCommand> SLC;
 419     LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 420     MachOObj->ReadSegment64LoadCommand(LCI, SLC);
 421     InMemoryStruct<macho::Section64> Sect;
 422     MachOObj->ReadSection64(LCI, DRI.d.b, Sect);
 423
 424     strcpy(result, Sect->SegmentName);
 425     strcat(result, ",");
 426     strcat(result, Sect->Name);
 427   } else {
 428     InMemoryStruct<macho::SegmentLoadCommand> SLC;
 429     LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
 430     MachOObj->ReadSegmentLoadCommand(LCI, SLC);
 431     InMemoryStruct<macho::Section> Sect;
 432     MachOObj->ReadSection(LCI, DRI.d.b, Sect);
 433
 434     strcpy(result, Sect->SegmentName);
 435     strcat(result, ",");
 436     strcat(result, Sect->Name);
 437   }
 438   Result = StringRef(result);
 439   return object_error::success;
 440 }
 441
 442 error_code MachOObjectFile::getSectionAddress(DataRefImpl DRI,
 443                                               uint64_t &Result) const {
 444   if (is64BitLoadCommand(MachOObj, DRI)) {
 445     InMemoryStruct<macho::Section64> Sect;
 446     getSection64(DRI, Sect);
 447     Result = Sect->Address;
 448   } else {
 449     InMemoryStruct<macho::Section> Sect;
 450     getSection(DRI, Sect);
 451     Result = Sect->Address;
 452   }
 453   return object_error::success;
 454 }
 455
 456 error_code MachOObjectFile::getSectionSize(DataRefImpl DRI,
 457                                            uint64_t &Result) const {
 458   if (is64BitLoadCommand(MachOObj, DRI)) {
 459     InMemoryStruct<macho::Section64> Sect;
 460     getSection64(DRI, Sect);
 461     Result = Sect->Size;
 462   } else {
 463     InMemoryStruct<macho::Section> Sect;
 464     getSection(DRI, Sect);
 465     Result = Sect->Size;
 466   }
 467   return object_error::success;
 468 }
 469
 470 error_code MachOObjectFile::getSectionContents(DataRefImpl DRI,
 471                                                StringRef &Result) const {
 472   if (is64BitLoadCommand(MachOObj, DRI)) {
 473     InMemoryStruct<macho::Section64> Sect;
 474     getSection64(DRI, Sect);
 475     Result = MachOObj->getData(Sect->Offset, Sect->Size);
 476   } else {
 477     InMemoryStruct<macho::Section> Sect;
 478     getSection(DRI, Sect);
 479     Result = MachOObj->getData(Sect->Offset, Sect->Size);
 480   }
 481   return object_error::success;
 482 }
 483
 484 error_code MachOObjectFile::isSectionText(DataRefImpl DRI,
 485                                           bool &Result) const {
 486   if (is64BitLoadCommand(MachOObj, DRI)) {
 487     InMemoryStruct<macho::Section64> Sect;
 488     getSection64(DRI, Sect);
 489     Result = !strcmp(Sect->Name, "__text");
 490   } else {
 491     InMemoryStruct<macho::Section> Sect;
 492     getSection(DRI, Sect);
 493     Result = !strcmp(Sect->Name, "__text");
 494   }
 495   return object_error::success;
 496 }
 497
 498 error_code MachOObjectFile::isSectionData(DataRefImpl DRI,
 499                                           bool &Result) const {
 500   // FIXME: Unimplemented.
 501   Result = false;
 502   return object_error::success;
 503 }
 504
 505 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI,
 506                                          bool &Result) const {
 507   // FIXME: Unimplemented.
 508   Result = false;
 509   return object_error::success;
 510 }
 511
 512 error_code MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
 513                                                   DataRefImpl Symb,
 514                                                   bool &Result) const {
 515   if (MachOObj->is64Bit()) {
 516     InMemoryStruct<macho::Symbol64TableEntry> Entry;
 517     getSymbol64TableEntry(Symb, Entry);
 518     Result = Entry->SectionIndex == 1 + Sec.d.a + Sec.d.b;
 519   } else {
 520     InMemoryStruct<macho::SymbolTableEntry> Entry;
 521     getSymbolTableEntry(Symb, Entry);
 522     Result = Entry->SectionIndex == 1 + Sec.d.a + Sec.d.b;
 523   }
 524   return object_error::success;
 525 }
 526
 527 relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
 528   DataRefImpl ret;
 529   ret.d.a = 0;
 530   ret.d.b = getSectionIndex(Sec);
 531   return relocation_iterator(RelocationRef(ret, this));
 532 }
 533 relocation_iterator MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
 534   uint32_t last_reloc;
 535   if (is64BitLoadCommand(MachOObj, Sec)) {
 536     InMemoryStruct<macho::Section64> Sect;
 537     getSection64(Sec, Sect);
 538     last_reloc = Sect->NumRelocationTableEntries;
 539   } else {
 540     InMemoryStruct<macho::Section> Sect;
 541     getSection(Sec, Sect);
 542     last_reloc = Sect->NumRelocationTableEntries;
 543   }
 544   DataRefImpl ret;
 545   ret.d.a = last_reloc;
 546   ret.d.b = getSectionIndex(Sec);
 547   return relocation_iterator(RelocationRef(ret, this));
 548 }
 549
 550 section_iterator MachOObjectFile::begin_sections() const {
 551   DataRefImpl DRI;
 552   DRI.d.a = DRI.d.b = 0;
 553   moveToNextSection(DRI);
 554   return section_iterator(SectionRef(DRI, this));
 555 }
 556
 557 section_iterator MachOObjectFile::end_sections() const {
 558   DataRefImpl DRI;
 559   DRI.d.a = MachOObj->getHeader().NumLoadCommands;
 560   DRI.d.b = 0;
 561   return section_iterator(SectionRef(DRI, this));
 562 }
 563
 564 /*===-- Relocations -------------------------------------------------------===*/
 565
 566 void MachOObjectFile::
 567 getRelocation(DataRefImpl Rel,
 568               InMemoryStruct<macho::RelocationEntry> &Res) const {
 569   uint32_t relOffset;
 570   if (MachOObj->is64Bit()) {
 571     InMemoryStruct<macho::Section64> Sect;
 572     getSection64(Sections[Rel.d.b], Sect);
 573     relOffset = Sect->RelocationTableOffset;
 574   } else {
 575     InMemoryStruct<macho::Section> Sect;
 576     getSection(Sections[Rel.d.b], Sect);
 577     relOffset = Sect->RelocationTableOffset;
 578   }
 579   MachOObj->ReadRelocationEntry(relOffset, Rel.d.a, Res);
 580 }
 581 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
 582                                               RelocationRef &Res) const {
 583   ++Rel.d.a;
 584   Res = RelocationRef(Rel, this);
 585   return object_error::success;
 586 }
 587 error_code MachOObjectFile::getRelocationAddress(DataRefImpl Rel,
 588                                                  uint64_t &Res) const {
 589   const uint8_t* sectAddress = base();
 590   if (MachOObj->is64Bit()) {
 591     InMemoryStruct<macho::Section64> Sect;
 592     getSection64(Sections[Rel.d.b], Sect);
 593     sectAddress += Sect->Offset;
 594   } else {
 595     InMemoryStruct<macho::Section> Sect;
 596     getSection(Sections[Rel.d.b], Sect);
 597     sectAddress += Sect->Offset;
 598   }
 599   InMemoryStruct<macho::RelocationEntry> RE;
 600   getRelocation(Rel, RE);
 601   Res = reinterpret_cast<uintptr_t>(sectAddress + RE->Word0);
 602   return object_error::success;
 603 }
 604 error_code MachOObjectFile::getRelocationSymbol(DataRefImpl Rel,
 605                                                 SymbolRef &Res) const {
 606   InMemoryStruct<macho::RelocationEntry> RE;
 607   getRelocation(Rel, RE);
 608   uint32_t SymbolIdx = RE->Word1 & 0xffffff;
 609   bool isExtern = (RE->Word1 >> 27) & 1;
 610
 611   DataRefImpl Sym;
 612   Sym.d.a = Sym.d.b = 0;
 613   moveToNextSymbol(Sym);
 614   if (isExtern) {
 615     for (unsigned i = 0; i < SymbolIdx; i++) {
 616       Sym.d.b++;
 617       moveToNextSymbol(Sym);
 618       assert(Sym.d.a < MachOObj->getHeader().NumLoadCommands &&
 619              "Relocation symbol index out of range!");
 620     }
 621   }
 622   Res = SymbolRef(Sym, this);
 623   return object_error::success;
 624 }
 625 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
 626                                               uint32_t &Res) const {
 627   InMemoryStruct<macho::RelocationEntry> RE;
 628   getRelocation(Rel, RE);
 629   Res = RE->Word1;
 630   return object_error::success;
 631 }
 632 error_code MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
 633                                           SmallVectorImpl<char> &Result) const {
 634   return object_error::success;
 635 }
 636 error_code MachOObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
 637                                                         int64_t &Res) const {
 638   InMemoryStruct<macho::RelocationEntry> RE;
 639   getRelocation(Rel, RE);
 640   bool isExtern = (RE->Word1 >> 27) & 1;
 641   Res = 0;
 642   if (!isExtern) {
 643     const uint8_t* sectAddress = base();
 644     if (MachOObj->is64Bit()) {
 645       InMemoryStruct<macho::Section64> Sect;
 646       getSection64(Sections[Rel.d.b], Sect);
 647       sectAddress += Sect->Offset;
 648     } else {
 649       InMemoryStruct<macho::Section> Sect;
 650       getSection(Sections[Rel.d.b], Sect);
 651       sectAddress += Sect->Offset;
 652     }
 653     Res = reinterpret_cast<uintptr_t>(sectAddress);
 654   }
 655   return object_error::success;
 656 }
 657 error_code MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
 658                                           SmallVectorImpl<char> &Result) const {
 659   return object_error::success;
 660 }
 661
 662 /*===-- Miscellaneous -----------------------------------------------------===*/
 663
 664 uint8_t MachOObjectFile::getBytesInAddress() const {
 665   return MachOObj->is64Bit() ? 8 : 4;
 666 }
 667
 668 StringRef MachOObjectFile::getFileFormatName() const {
 669   if (!MachOObj->is64Bit()) {
 670     switch (MachOObj->getHeader().CPUType) {
 671     case llvm::MachO::CPUTypeI386:
 672       return "Mach-O 32-bit i386";
 673     case llvm::MachO::CPUTypeARM:
 674       return "Mach-O arm";
 675     case llvm::MachO::CPUTypePowerPC:
 676       return "Mach-O 32-bit ppc";
 677     default:
 678       assert((MachOObj->getHeader().CPUType & llvm::MachO::CPUArchABI64) == 0 &&
 679              "64-bit object file when we're not 64-bit?");
 680       return "Mach-O 32-bit unknown";
 681     }
 682   }
 683
 684   switch (MachOObj->getHeader().CPUType) {
 685   case llvm::MachO::CPUTypeX86_64:
 686     return "Mach-O 64-bit x86-64";
 687   case llvm::MachO::CPUTypePowerPC64:
 688     return "Mach-O 64-bit ppc64";
 689   default:
 690     assert((MachOObj->getHeader().CPUType & llvm::MachO::CPUArchABI64) == 1 &&
 691            "32-bit object file when we're 64-bit?");
 692     return "Mach-O 64-bit unknown";
 693   }
 694 }
 695
 696 unsigned MachOObjectFile::getArch() const {
 697   switch (MachOObj->getHeader().CPUType) {
 698   case llvm::MachO::CPUTypeI386:
 699     return Triple::x86;
 700   case llvm::MachO::CPUTypeX86_64:
 701     return Triple::x86_64;
 702   case llvm::MachO::CPUTypeARM:
 703     return Triple::arm;
 704   case llvm::MachO::CPUTypePowerPC:
 705     return Triple::ppc;
 706   case llvm::MachO::CPUTypePowerPC64:
 707     return Triple::ppc64;
 708   default:
 709     return Triple::UnknownArch;
 710   }
 711 }
 712
 713 } // end namespace llvm