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