MachOObjectFile.cpp revision 167957fa095bc7200b908e6e142be3e604bcfeea 
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/Object/MachO.h"
16#include "llvm/ADT/Triple.h"
17#include "llvm/Object/MachOFormat.h"
18#include "llvm/Support/DataExtractor.h"
19#include "llvm/Support/Format.h"
20#include "llvm/Support/Host.h"
21#include "llvm/Support/MemoryBuffer.h"
22#include <cctype>
23#include <cstring>
24#include <limits>
25
26using namespace llvm;
27using namespace object;
28
29namespace llvm {
30namespace object {
31
32struct SymbolTableEntryBase {
33  uint32_t StringIndex;
34  uint8_t Type;
35  uint8_t SectionIndex;
36  uint16_t Flags;
37};
38
39struct SectionBase {
40  char Name[16];
41  char SegmentName[16];
42};
43
44template<typename T>
45static void SwapValue(T &Value) {
46  Value = sys::SwapByteOrder(Value);
47}
48
49template<typename T>
50static void SwapStruct(T &Value);
51
52template<>
53void SwapStruct(macho::RelocationEntry &H) {
54  SwapValue(H.Word0);
55  SwapValue(H.Word1);
56}
57
58template<>
59void SwapStruct(macho::LoadCommand &L) {
60  SwapValue(L.Type);
61  SwapValue(L.Size);
62}
63
64template<>
65void SwapStruct(SymbolTableEntryBase &S) {
66  SwapValue(S.StringIndex);
67  SwapValue(S.Flags);
68}
69
70template<>
71void SwapStruct(macho::Section &S) {
72  SwapValue(S.Address);
73  SwapValue(S.Size);
74  SwapValue(S.Offset);
75  SwapValue(S.Align);
76  SwapValue(S.RelocationTableOffset);
77  SwapValue(S.NumRelocationTableEntries);
78  SwapValue(S.Flags);
79  SwapValue(S.Reserved1);
80  SwapValue(S.Reserved2);
81}
82
83template<>
84void SwapStruct(macho::Section64 &S) {
85  SwapValue(S.Address);
86  SwapValue(S.Size);
87  SwapValue(S.Offset);
88  SwapValue(S.Align);
89  SwapValue(S.RelocationTableOffset);
90  SwapValue(S.NumRelocationTableEntries);
91  SwapValue(S.Flags);
92  SwapValue(S.Reserved1);
93  SwapValue(S.Reserved2);
94  SwapValue(S.Reserved3);
95}
96
97template<>
98void SwapStruct(macho::SymbolTableEntry &S) {
99  SwapValue(S.StringIndex);
100  SwapValue(S.Flags);
101  SwapValue(S.Value);
102}
103
104template<>
105void SwapStruct(macho::Symbol64TableEntry &S) {
106  SwapValue(S.StringIndex);
107  SwapValue(S.Flags);
108  SwapValue(S.Value);
109}
110
111template<>
112void SwapStruct(macho::Header &H) {
113  SwapValue(H.Magic);
114  SwapValue(H.CPUType);
115  SwapValue(H.CPUSubtype);
116  SwapValue(H.FileType);
117  SwapValue(H.NumLoadCommands);
118  SwapValue(H.SizeOfLoadCommands);
119  SwapValue(H.Flags);
120}
121
122template<>
123void SwapStruct(macho::Header64Ext &E) {
124  SwapValue(E.Reserved);
125}
126
127template<>
128void SwapStruct(macho::SymtabLoadCommand &C) {
129  SwapValue(C.Type);
130  SwapValue(C.Size);
131  SwapValue(C.SymbolTableOffset);
132  SwapValue(C.NumSymbolTableEntries);
133  SwapValue(C.StringTableOffset);
134  SwapValue(C.StringTableSize);
135}
136
137template<>
138void SwapStruct(macho::DysymtabLoadCommand &C) {
139  SwapValue(C.Type);
140  SwapValue(C.Size);
141  SwapValue(C.LocalSymbolsIndex);
142  SwapValue(C.NumLocalSymbols);
143  SwapValue(C.ExternalSymbolsIndex);
144  SwapValue(C.NumExternalSymbols);
145  SwapValue(C.UndefinedSymbolsIndex);
146  SwapValue(C.NumUndefinedSymbols);
147  SwapValue(C.TOCOffset);
148  SwapValue(C.NumTOCEntries);
149  SwapValue(C.ModuleTableOffset);
150  SwapValue(C.NumModuleTableEntries);
151  SwapValue(C.ReferenceSymbolTableOffset);
152  SwapValue(C.NumReferencedSymbolTableEntries);
153  SwapValue(C.IndirectSymbolTableOffset);
154  SwapValue(C.NumIndirectSymbolTableEntries);
155  SwapValue(C.ExternalRelocationTableOffset);
156  SwapValue(C.NumExternalRelocationTableEntries);
157  SwapValue(C.LocalRelocationTableOffset);
158  SwapValue(C.NumLocalRelocationTableEntries);
159}
160
161template<>
162void SwapStruct(macho::LinkeditDataLoadCommand &C) {
163  SwapValue(C.Type);
164  SwapValue(C.Size);
165  SwapValue(C.DataOffset);
166  SwapValue(C.DataSize);
167}
168
169template<>
170void SwapStruct(macho::SegmentLoadCommand &C) {
171  SwapValue(C.Type);
172  SwapValue(C.Size);
173  SwapValue(C.VMAddress);
174  SwapValue(C.VMSize);
175  SwapValue(C.FileOffset);
176  SwapValue(C.FileSize);
177  SwapValue(C.MaxVMProtection);
178  SwapValue(C.InitialVMProtection);
179  SwapValue(C.NumSections);
180  SwapValue(C.Flags);
181}
182
183template<>
184void SwapStruct(macho::Segment64LoadCommand &C) {
185  SwapValue(C.Type);
186  SwapValue(C.Size);
187  SwapValue(C.VMAddress);
188  SwapValue(C.VMSize);
189  SwapValue(C.FileOffset);
190  SwapValue(C.FileSize);
191  SwapValue(C.MaxVMProtection);
192  SwapValue(C.InitialVMProtection);
193  SwapValue(C.NumSections);
194  SwapValue(C.Flags);
195}
196
197template<>
198void SwapStruct(macho::IndirectSymbolTableEntry &C) {
199  SwapValue(C.Index);
200}
201
202template<>
203void SwapStruct(macho::LinkerOptionsLoadCommand &C) {
204  SwapValue(C.Type);
205  SwapValue(C.Size);
206  SwapValue(C.Count);
207}
208
209template<>
210void SwapStruct(macho::DataInCodeTableEntry &C) {
211  SwapValue(C.Offset);
212  SwapValue(C.Length);
213  SwapValue(C.Kind);
214}
215
216template<typename T>
217T getStruct(const MachOObjectFile *O, const char *P) {
218  T Cmd;
219  memcpy(&Cmd, P, sizeof(T));
220  if (O->isLittleEndian() != sys::IsLittleEndianHost)
221    SwapStruct(Cmd);
222  return Cmd;
223}
224
225static uint32_t
226getSegmentLoadCommandNumSections(const MachOObjectFile *O,
227                                 const MachOObjectFile::LoadCommandInfo &L) {
228  if (O->is64Bit()) {
229    macho::Segment64LoadCommand S = O->getSegment64LoadCommand(L);
230    return S.NumSections;
231  }
232  macho::SegmentLoadCommand S = O->getSegmentLoadCommand(L);
233  return S.NumSections;
234}
235
236static const char *
237getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
238              unsigned Sec) {
239  uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
240
241  bool Is64 = O->is64Bit();
242  unsigned SegmentLoadSize = Is64 ? sizeof(macho::Segment64LoadCommand) :
243                                    sizeof(macho::SegmentLoadCommand);
244  unsigned SectionSize = Is64 ? sizeof(macho::Section64) :
245                                sizeof(macho::Section);
246
247  uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
248  return reinterpret_cast<const char*>(SectionAddr);
249}
250
251static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
252  return O->getData().substr(Offset, 1).data();
253}
254
255static SymbolTableEntryBase
256getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
257  const char *P = reinterpret_cast<const char *>(DRI.p);
258  return getStruct<SymbolTableEntryBase>(O, P);
259}
260
261static StringRef parseSegmentOrSectionName(const char *P) {
262  if (P[15] == 0)
263    // Null terminated.
264    return P;
265  // Not null terminated, so this is a 16 char string.
266  return StringRef(P, 16);
267}
268
269// Helper to advance a section or symbol iterator multiple increments at a time.
270template<class T>
271static error_code advance(T &it, size_t Val) {
272  error_code ec;
273  while (Val--) {
274    it.increment(ec);
275  }
276  return ec;
277}
278
279template<class T>
280static void advanceTo(T &it, size_t Val) {
281  if (error_code ec = advance(it, Val))
282    report_fatal_error(ec.message());
283}
284
285static unsigned getCPUType(const MachOObjectFile *O) {
286  return O->getHeader().CPUType;
287}
288
289static void printRelocationTargetName(const MachOObjectFile *O,
290                                      const macho::RelocationEntry &RE,
291                                      raw_string_ostream &fmt) {
292  bool IsScattered = O->isRelocationScattered(RE);
293
294  // Target of a scattered relocation is an address.  In the interest of
295  // generating pretty output, scan through the symbol table looking for a
296  // symbol that aligns with that address.  If we find one, print it.
297  // Otherwise, we just print the hex address of the target.
298  if (IsScattered) {
299    uint32_t Val = O->getPlainRelocationSymbolNum(RE);
300
301    error_code ec;
302    for (symbol_iterator SI = O->begin_symbols(), SE = O->end_symbols();
303         SI != SE; SI.increment(ec)) {
304      if (ec) report_fatal_error(ec.message());
305
306      uint64_t Addr;
307      StringRef Name;
308
309      if ((ec = SI->getAddress(Addr)))
310        report_fatal_error(ec.message());
311      if (Addr != Val) continue;
312      if ((ec = SI->getName(Name)))
313        report_fatal_error(ec.message());
314      fmt << Name;
315      return;
316    }
317
318    // If we couldn't find a symbol that this relocation refers to, try
319    // to find a section beginning instead.
320    for (section_iterator SI = O->begin_sections(), SE = O->end_sections();
321         SI != SE; SI.increment(ec)) {
322      if (ec) report_fatal_error(ec.message());
323
324      uint64_t Addr;
325      StringRef Name;
326
327      if ((ec = SI->getAddress(Addr)))
328        report_fatal_error(ec.message());
329      if (Addr != Val) continue;
330      if ((ec = SI->getName(Name)))
331        report_fatal_error(ec.message());
332      fmt << Name;
333      return;
334    }
335
336    fmt << format("0x%x", Val);
337    return;
338  }
339
340  StringRef S;
341  bool isExtern = O->getPlainRelocationExternal(RE);
342  uint64_t Val = O->getAnyRelocationAddress(RE);
343
344  if (isExtern) {
345    symbol_iterator SI = O->begin_symbols();
346    advanceTo(SI, Val);
347    SI->getName(S);
348  } else {
349    section_iterator SI = O->begin_sections();
350    advanceTo(SI, Val);
351    SI->getName(S);
352  }
353
354  fmt << S;
355}
356
357static uint32_t getPlainRelocationAddress(const macho::RelocationEntry &RE) {
358  return RE.Word0;
359}
360
361static unsigned
362getScatteredRelocationAddress(const macho::RelocationEntry &RE) {
363  return RE.Word0 & 0xffffff;
364}
365
366static bool getPlainRelocationPCRel(const MachOObjectFile *O,
367                                    const macho::RelocationEntry &RE) {
368  if (O->isLittleEndian())
369    return (RE.Word1 >> 24) & 1;
370  return (RE.Word1 >> 7) & 1;
371}
372
373static bool
374getScatteredRelocationPCRel(const MachOObjectFile *O,
375                            const macho::RelocationEntry &RE) {
376  return (RE.Word0 >> 30) & 1;
377}
378
379static unsigned getPlainRelocationLength(const MachOObjectFile *O,
380                                         const macho::RelocationEntry &RE) {
381  if (O->isLittleEndian())
382    return (RE.Word1 >> 25) & 3;
383  return (RE.Word1 >> 5) & 3;
384}
385
386static unsigned
387getScatteredRelocationLength(const macho::RelocationEntry &RE) {
388  return (RE.Word0 >> 28) & 3;
389}
390
391static unsigned getPlainRelocationType(const MachOObjectFile *O,
392                                       const macho::RelocationEntry &RE) {
393  if (O->isLittleEndian())
394    return RE.Word1 >> 28;
395  return RE.Word1 & 0xf;
396}
397
398static unsigned getScatteredRelocationType(const macho::RelocationEntry &RE) {
399  return (RE.Word0 >> 24) & 0xf;
400}
401
402static uint32_t getSectionFlags(const MachOObjectFile *O,
403                                DataRefImpl Sec) {
404  if (O->is64Bit()) {
405    macho::Section64 Sect = O->getSection64(Sec);
406    return Sect.Flags;
407  }
408  macho::Section Sect = O->getSection(Sec);
409  return Sect.Flags;
410}
411
412MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
413                                 bool IsLittleEndian, bool Is64bits,
414                                 error_code &ec)
415    : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
416      SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL) {
417  uint32_t LoadCommandCount = this->getHeader().NumLoadCommands;
418  macho::LoadCommandType SegmentLoadType = is64Bit() ?
419    macho::LCT_Segment64 : macho::LCT_Segment;
420
421  MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
422  for (unsigned I = 0; ; ++I) {
423    if (Load.C.Type == macho::LCT_Symtab) {
424      assert(!SymtabLoadCmd && "Multiple symbol tables");
425      SymtabLoadCmd = Load.Ptr;
426    } else if (Load.C.Type == macho::LCT_Dysymtab) {
427      assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
428      DysymtabLoadCmd = Load.Ptr;
429    } else if (Load.C.Type == SegmentLoadType) {
430      uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
431      for (unsigned J = 0; J < NumSections; ++J) {
432        const char *Sec = getSectionPtr(this, Load, J);
433        Sections.push_back(Sec);
434      }
435    }
436
437    if (I == LoadCommandCount - 1)
438      break;
439    else
440      Load = getNextLoadCommandInfo(Load);
441  }
442}
443
444error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
445                                          SymbolRef &Res) const {
446  unsigned SymbolTableEntrySize = is64Bit() ?
447    sizeof(macho::Symbol64TableEntry) :
448    sizeof(macho::SymbolTableEntry);
449  Symb.p += SymbolTableEntrySize;
450  Res = SymbolRef(Symb, this);
451  return object_error::success;
452}
453
454error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
455                                          StringRef &Res) const {
456  StringRef StringTable = getStringTableData();
457  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
458  const char *Start = &StringTable.data()[Entry.StringIndex];
459  Res = StringRef(Start);
460  return object_error::success;
461}
462
463error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
464                                             uint64_t &Res) const {
465  if (is64Bit()) {
466    macho::Symbol64TableEntry Entry = getSymbol64TableEntry(Symb);
467    Res = Entry.Value;
468  } else {
469    macho::SymbolTableEntry Entry = getSymbolTableEntry(Symb);
470    Res = Entry.Value;
471  }
472  return object_error::success;
473}
474
475error_code
476MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
477                                     uint64_t &Res) const {
478  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
479  getSymbolAddress(Symb, Res);
480  if (Entry.SectionIndex) {
481    uint64_t Delta;
482    DataRefImpl SecRel;
483    SecRel.d.a = Entry.SectionIndex-1;
484    if (is64Bit()) {
485      macho::Section64 Sec = getSection64(SecRel);
486      Delta = Sec.Offset - Sec.Address;
487    } else {
488      macho::Section Sec = getSection(SecRel);
489      Delta = Sec.Offset - Sec.Address;
490    }
491
492    Res += Delta;
493  }
494
495  return object_error::success;
496}
497
498error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
499                                               uint32_t &Result) const {
500  uint32_t flags;
501  this->getSymbolFlags(DRI, flags);
502  if (flags & SymbolRef::SF_Common) {
503    SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
504    Result = 1 << MachO::GET_COMM_ALIGN(Entry.Flags);
505  } else {
506    Result = 0;
507  }
508  return object_error::success;
509}
510
511error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
512                                          uint64_t &Result) const {
513  uint64_t BeginOffset;
514  uint64_t EndOffset = 0;
515  uint8_t SectionIndex;
516
517  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
518  uint64_t Value;
519  getSymbolAddress(DRI, Value);
520
521  BeginOffset = Value;
522
523  SectionIndex = Entry.SectionIndex;
524  if (!SectionIndex) {
525    uint32_t flags = SymbolRef::SF_None;
526    this->getSymbolFlags(DRI, flags);
527    if (flags & SymbolRef::SF_Common)
528      Result = Value;
529    else
530      Result = UnknownAddressOrSize;
531    return object_error::success;
532  }
533  // Unfortunately symbols are unsorted so we need to touch all
534  // symbols from load command
535  error_code ec;
536  for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E;
537       I.increment(ec)) {
538    DataRefImpl DRI = I->getRawDataRefImpl();
539    Entry = getSymbolTableEntryBase(this, DRI);
540    getSymbolAddress(DRI, Value);
541    if (Entry.SectionIndex == SectionIndex && Value > BeginOffset)
542      if (!EndOffset || Value < EndOffset)
543        EndOffset = Value;
544  }
545  if (!EndOffset) {
546    uint64_t Size;
547    DataRefImpl Sec;
548    Sec.d.a = SectionIndex-1;
549    getSectionSize(Sec, Size);
550    getSectionAddress(Sec, EndOffset);
551    EndOffset += Size;
552  }
553  Result = EndOffset - BeginOffset;
554  return object_error::success;
555}
556
557error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
558                                          SymbolRef::Type &Res) const {
559  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
560  uint8_t n_type = Entry.Type;
561
562  Res = SymbolRef::ST_Other;
563
564  // If this is a STAB debugging symbol, we can do nothing more.
565  if (n_type & MachO::NlistMaskStab) {
566    Res = SymbolRef::ST_Debug;
567    return object_error::success;
568  }
569
570  switch (n_type & MachO::NlistMaskType) {
571    case MachO::NListTypeUndefined :
572      Res = SymbolRef::ST_Unknown;
573      break;
574    case MachO::NListTypeSection :
575      Res = SymbolRef::ST_Function;
576      break;
577  }
578  return object_error::success;
579}
580
581error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
582                                                char &Res) const {
583  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
584  uint8_t Type = Entry.Type;
585  uint16_t Flags = Entry.Flags;
586
587  char Char;
588  switch (Type & macho::STF_TypeMask) {
589    case macho::STT_Undefined:
590      Char = 'u';
591      break;
592    case macho::STT_Absolute:
593    case macho::STT_Section:
594      Char = 's';
595      break;
596    default:
597      Char = '?';
598      break;
599  }
600
601  if (Flags & (macho::STF_External | macho::STF_PrivateExtern))
602    Char = toupper(static_cast<unsigned char>(Char));
603  Res = Char;
604  return object_error::success;
605}
606
607error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
608                                           uint32_t &Result) const {
609  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
610
611  uint8_t MachOType = Entry.Type;
612  uint16_t MachOFlags = Entry.Flags;
613
614  // TODO: Correctly set SF_ThreadLocal
615  Result = SymbolRef::SF_None;
616
617  if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
618    Result |= SymbolRef::SF_Undefined;
619
620  if (MachOFlags & macho::STF_StabsEntryMask)
621    Result |= SymbolRef::SF_FormatSpecific;
622
623  if (MachOType & MachO::NlistMaskExternal) {
624    Result |= SymbolRef::SF_Global;
625    if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined) {
626      uint64_t Value;
627      getSymbolAddress(DRI, Value);
628      if (Value)
629        Result |= SymbolRef::SF_Common;
630    }
631  }
632
633  if (MachOFlags & (MachO::NListDescWeakRef | MachO::NListDescWeakDef))
634    Result |= SymbolRef::SF_Weak;
635
636  if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeAbsolute)
637    Result |= SymbolRef::SF_Absolute;
638
639  return object_error::success;
640}
641
642error_code
643MachOObjectFile::getSymbolSection(DataRefImpl Symb,
644                                  section_iterator &Res) const {
645  SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
646  uint8_t index = Entry.SectionIndex;
647
648  if (index == 0) {
649    Res = end_sections();
650  } else {
651    DataRefImpl DRI;
652    DRI.d.a = index - 1;
653    Res = section_iterator(SectionRef(DRI, this));
654  }
655
656  return object_error::success;
657}
658
659error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
660                                           uint64_t &Val) const {
661  report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
662}
663
664error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
665                                           SectionRef &Res) const {
666  Sec.d.a++;
667  Res = SectionRef(Sec, this);
668  return object_error::success;
669}
670
671error_code
672MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
673  ArrayRef<char> Raw = getSectionRawName(Sec);
674  Result = parseSegmentOrSectionName(Raw.data());
675  return object_error::success;
676}
677
678error_code
679MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
680  if (is64Bit()) {
681    macho::Section64 Sect = getSection64(Sec);
682    Res = Sect.Address;
683  } else {
684    macho::Section Sect = getSection(Sec);
685    Res = Sect.Address;
686  }
687  return object_error::success;
688}
689
690error_code
691MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
692  if (is64Bit()) {
693    macho::Section64 Sect = getSection64(Sec);
694    Res = Sect.Size;
695  } else {
696    macho::Section Sect = getSection(Sec);
697    Res = Sect.Size;
698  }
699
700  return object_error::success;
701}
702
703error_code
704MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
705  uint32_t Offset;
706  uint64_t Size;
707
708  if (is64Bit()) {
709    macho::Section64 Sect = getSection64(Sec);
710    Offset = Sect.Offset;
711    Size = Sect.Size;
712  } else {
713    macho::Section Sect =getSection(Sec);
714    Offset = Sect.Offset;
715    Size = Sect.Size;
716  }
717
718  Res = this->getData().substr(Offset, Size);
719  return object_error::success;
720}
721
722error_code
723MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
724  uint32_t Align;
725  if (is64Bit()) {
726    macho::Section64 Sect = getSection64(Sec);
727    Align = Sect.Align;
728  } else {
729    macho::Section Sect = getSection(Sec);
730    Align = Sect.Align;
731  }
732
733  Res = uint64_t(1) << Align;
734  return object_error::success;
735}
736
737error_code
738MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
739  uint32_t Flags = getSectionFlags(this, Sec);
740  Res = Flags & macho::SF_PureInstructions;
741  return object_error::success;
742}
743
744error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
745  // FIXME: Unimplemented.
746  Result = false;
747  return object_error::success;
748}
749
750error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
751  // FIXME: Unimplemented.
752  Result = false;
753  return object_error::success;
754}
755
756error_code
757MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
758                                               bool &Result) const {
759  // FIXME: Unimplemented.
760  Result = true;
761  return object_error::success;
762}
763
764error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
765                                             bool &Result) const {
766  // FIXME: Unimplemented.
767  Result = false;
768  return object_error::success;
769}
770
771error_code
772MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
773  uint32_t Flags = getSectionFlags(this, Sec);
774  unsigned SectionType = Flags & MachO::SectionFlagMaskSectionType;
775  Res = SectionType == MachO::SectionTypeZeroFill ||
776    SectionType == MachO::SectionTypeZeroFillLarge;
777  return object_error::success;
778}
779
780error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
781                                                  bool &Result) const {
782  // Consider using the code from isSectionText to look for __const sections.
783  // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
784  // to use section attributes to distinguish code from data.
785
786  // FIXME: Unimplemented.
787  Result = false;
788  return object_error::success;
789}
790
791error_code
792MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
793                                       bool &Result) const {
794  SymbolRef::Type ST;
795  this->getSymbolType(Symb, ST);
796  if (ST == SymbolRef::ST_Unknown) {
797    Result = false;
798    return object_error::success;
799  }
800
801  uint64_t SectBegin, SectEnd;
802  getSectionAddress(Sec, SectBegin);
803  getSectionSize(Sec, SectEnd);
804  SectEnd += SectBegin;
805
806  uint64_t SymAddr;
807  getSymbolAddress(Symb, SymAddr);
808  Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
809
810  return object_error::success;
811}
812
813relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
814  uint32_t Offset;
815  if (is64Bit()) {
816    macho::Section64 Sect = getSection64(Sec);
817    Offset = Sect.RelocationTableOffset;
818  } else {
819    macho::Section Sect = getSection(Sec);
820    Offset = Sect.RelocationTableOffset;
821  }
822
823  DataRefImpl Ret;
824  Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
825  return relocation_iterator(RelocationRef(Ret, this));
826}
827
828relocation_iterator
829MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
830  uint32_t Offset;
831  uint32_t Num;
832  if (is64Bit()) {
833    macho::Section64 Sect = getSection64(Sec);
834    Offset = Sect.RelocationTableOffset;
835    Num = Sect.NumRelocationTableEntries;
836  } else {
837    macho::Section Sect = getSection(Sec);
838    Offset = Sect.RelocationTableOffset;
839    Num = Sect.NumRelocationTableEntries;
840  }
841
842  const macho::RelocationEntry *P =
843    reinterpret_cast<const macho::RelocationEntry*>(getPtr(this, Offset));
844
845  DataRefImpl Ret;
846  Ret.p = reinterpret_cast<uintptr_t>(P + Num);
847  return relocation_iterator(RelocationRef(Ret, this));
848}
849
850error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
851                                              RelocationRef &Res) const {
852  const macho::RelocationEntry *P =
853    reinterpret_cast<const macho::RelocationEntry *>(Rel.p);
854  Rel.p = reinterpret_cast<uintptr_t>(P + 1);
855  Res = RelocationRef(Rel, this);
856  return object_error::success;
857}
858
859error_code
860MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
861  report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
862}
863
864error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
865                                                uint64_t &Res) const {
866  macho::RelocationEntry RE = getRelocation(Rel);
867  Res = getAnyRelocationAddress(RE);
868  return object_error::success;
869}
870
871error_code
872MachOObjectFile::getRelocationSymbol(DataRefImpl Rel, SymbolRef &Res) const {
873  macho::RelocationEntry RE = getRelocation(Rel);
874  uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
875  bool isExtern = getPlainRelocationExternal(RE);
876  if (!isExtern) {
877    Res = *end_symbols();
878    return object_error::success;
879  }
880
881  macho::SymtabLoadCommand S = getSymtabLoadCommand();
882  unsigned SymbolTableEntrySize = is64Bit() ?
883    sizeof(macho::Symbol64TableEntry) :
884    sizeof(macho::SymbolTableEntry);
885  uint64_t Offset = S.SymbolTableOffset + SymbolIdx * SymbolTableEntrySize;
886  DataRefImpl Sym;
887  Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
888  Res = SymbolRef(Sym, this);
889  return object_error::success;
890}
891
892error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
893                                              uint64_t &Res) const {
894  macho::RelocationEntry RE = getRelocation(Rel);
895  Res = getAnyRelocationType(RE);
896  return object_error::success;
897}
898
899error_code
900MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
901                                       SmallVectorImpl<char> &Result) const {
902  StringRef res;
903  uint64_t RType;
904  getRelocationType(Rel, RType);
905
906  unsigned Arch = this->getArch();
907
908  switch (Arch) {
909    case Triple::x86: {
910      static const char *const Table[] =  {
911        "GENERIC_RELOC_VANILLA",
912        "GENERIC_RELOC_PAIR",
913        "GENERIC_RELOC_SECTDIFF",
914        "GENERIC_RELOC_PB_LA_PTR",
915        "GENERIC_RELOC_LOCAL_SECTDIFF",
916        "GENERIC_RELOC_TLV" };
917
918      if (RType > 6)
919        res = "Unknown";
920      else
921        res = Table[RType];
922      break;
923    }
924    case Triple::x86_64: {
925      static const char *const Table[] =  {
926        "X86_64_RELOC_UNSIGNED",
927        "X86_64_RELOC_SIGNED",
928        "X86_64_RELOC_BRANCH",
929        "X86_64_RELOC_GOT_LOAD",
930        "X86_64_RELOC_GOT",
931        "X86_64_RELOC_SUBTRACTOR",
932        "X86_64_RELOC_SIGNED_1",
933        "X86_64_RELOC_SIGNED_2",
934        "X86_64_RELOC_SIGNED_4",
935        "X86_64_RELOC_TLV" };
936
937      if (RType > 9)
938        res = "Unknown";
939      else
940        res = Table[RType];
941      break;
942    }
943    case Triple::arm: {
944      static const char *const Table[] =  {
945        "ARM_RELOC_VANILLA",
946        "ARM_RELOC_PAIR",
947        "ARM_RELOC_SECTDIFF",
948        "ARM_RELOC_LOCAL_SECTDIFF",
949        "ARM_RELOC_PB_LA_PTR",
950        "ARM_RELOC_BR24",
951        "ARM_THUMB_RELOC_BR22",
952        "ARM_THUMB_32BIT_BRANCH",
953        "ARM_RELOC_HALF",
954        "ARM_RELOC_HALF_SECTDIFF" };
955
956      if (RType > 9)
957        res = "Unknown";
958      else
959        res = Table[RType];
960      break;
961    }
962    case Triple::ppc: {
963      static const char *const Table[] =  {
964        "PPC_RELOC_VANILLA",
965        "PPC_RELOC_PAIR",
966        "PPC_RELOC_BR14",
967        "PPC_RELOC_BR24",
968        "PPC_RELOC_HI16",
969        "PPC_RELOC_LO16",
970        "PPC_RELOC_HA16",
971        "PPC_RELOC_LO14",
972        "PPC_RELOC_SECTDIFF",
973        "PPC_RELOC_PB_LA_PTR",
974        "PPC_RELOC_HI16_SECTDIFF",
975        "PPC_RELOC_LO16_SECTDIFF",
976        "PPC_RELOC_HA16_SECTDIFF",
977        "PPC_RELOC_JBSR",
978        "PPC_RELOC_LO14_SECTDIFF",
979        "PPC_RELOC_LOCAL_SECTDIFF" };
980
981      res = Table[RType];
982      break;
983    }
984    case Triple::UnknownArch:
985      res = "Unknown";
986      break;
987  }
988  Result.append(res.begin(), res.end());
989  return object_error::success;
990}
991
992error_code
993MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
994                                          SmallVectorImpl<char> &Result) const {
995  macho::RelocationEntry RE = getRelocation(Rel);
996
997  unsigned Arch = this->getArch();
998
999  std::string fmtbuf;
1000  raw_string_ostream fmt(fmtbuf);
1001  unsigned Type = this->getAnyRelocationType(RE);
1002  bool IsPCRel = this->getAnyRelocationPCRel(RE);
1003
1004  // Determine any addends that should be displayed with the relocation.
1005  // These require decoding the relocation type, which is triple-specific.
1006
1007  // X86_64 has entirely custom relocation types.
1008  if (Arch == Triple::x86_64) {
1009    bool isPCRel = getAnyRelocationPCRel(RE);
1010
1011    switch (Type) {
1012      case macho::RIT_X86_64_GOTLoad:   // X86_64_RELOC_GOT_LOAD
1013      case macho::RIT_X86_64_GOT: {     // X86_64_RELOC_GOT
1014        printRelocationTargetName(this, RE, fmt);
1015        fmt << "@GOT";
1016        if (isPCRel) fmt << "PCREL";
1017        break;
1018      }
1019      case macho::RIT_X86_64_Subtractor: { // X86_64_RELOC_SUBTRACTOR
1020        DataRefImpl RelNext = Rel;
1021        RelNext.d.a++;
1022        macho::RelocationEntry RENext = getRelocation(RelNext);
1023
1024        // X86_64_SUBTRACTOR must be followed by a relocation of type
1025        // X86_64_RELOC_UNSIGNED.
1026        // NOTE: Scattered relocations don't exist on x86_64.
1027        unsigned RType = getAnyRelocationType(RENext);
1028        if (RType != 0)
1029          report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1030                             "X86_64_RELOC_SUBTRACTOR.");
1031
1032        // The X86_64_RELOC_UNSIGNED contains the minuend symbol,
1033        // X86_64_SUBTRACTOR contains to the subtrahend.
1034        printRelocationTargetName(this, RENext, fmt);
1035        fmt << "-";
1036        printRelocationTargetName(this, RE, fmt);
1037        break;
1038      }
1039      case macho::RIT_X86_64_TLV:
1040        printRelocationTargetName(this, RE, fmt);
1041        fmt << "@TLV";
1042        if (isPCRel) fmt << "P";
1043        break;
1044      case macho::RIT_X86_64_Signed1: // X86_64_RELOC_SIGNED1
1045        printRelocationTargetName(this, RE, fmt);
1046        fmt << "-1";
1047        break;
1048      case macho::RIT_X86_64_Signed2: // X86_64_RELOC_SIGNED2
1049        printRelocationTargetName(this, RE, fmt);
1050        fmt << "-2";
1051        break;
1052      case macho::RIT_X86_64_Signed4: // X86_64_RELOC_SIGNED4
1053        printRelocationTargetName(this, RE, fmt);
1054        fmt << "-4";
1055        break;
1056      default:
1057        printRelocationTargetName(this, RE, fmt);
1058        break;
1059    }
1060  // X86 and ARM share some relocation types in common.
1061  } else if (Arch == Triple::x86 || Arch == Triple::arm) {
1062    // Generic relocation types...
1063    switch (Type) {
1064      case macho::RIT_Pair: // GENERIC_RELOC_PAIR - prints no info
1065        return object_error::success;
1066      case macho::RIT_Difference: { // GENERIC_RELOC_SECTDIFF
1067        DataRefImpl RelNext = Rel;
1068        RelNext.d.a++;
1069        macho::RelocationEntry RENext = getRelocation(RelNext);
1070
1071        // X86 sect diff's must be followed by a relocation of type
1072        // GENERIC_RELOC_PAIR.
1073        unsigned RType = getAnyRelocationType(RENext);
1074
1075        if (RType != 1)
1076          report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1077                             "GENERIC_RELOC_SECTDIFF.");
1078
1079        printRelocationTargetName(this, RE, fmt);
1080        fmt << "-";
1081        printRelocationTargetName(this, RENext, fmt);
1082        break;
1083      }
1084    }
1085
1086    if (Arch == Triple::x86) {
1087      // All X86 relocations that need special printing were already
1088      // handled in the generic code.
1089      switch (Type) {
1090        case macho::RIT_Generic_LocalDifference:{// GENERIC_RELOC_LOCAL_SECTDIFF
1091          DataRefImpl RelNext = Rel;
1092          RelNext.d.a++;
1093          macho::RelocationEntry RENext = getRelocation(RelNext);
1094
1095          // X86 sect diff's must be followed by a relocation of type
1096          // GENERIC_RELOC_PAIR.
1097          unsigned RType = getAnyRelocationType(RENext);
1098          if (RType != 1)
1099            report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1100                               "GENERIC_RELOC_LOCAL_SECTDIFF.");
1101
1102          printRelocationTargetName(this, RE, fmt);
1103          fmt << "-";
1104          printRelocationTargetName(this, RENext, fmt);
1105          break;
1106        }
1107        case macho::RIT_Generic_TLV: {
1108          printRelocationTargetName(this, RE, fmt);
1109          fmt << "@TLV";
1110          if (IsPCRel) fmt << "P";
1111          break;
1112        }
1113        default:
1114          printRelocationTargetName(this, RE, fmt);
1115      }
1116    } else { // ARM-specific relocations
1117      switch (Type) {
1118        case macho::RIT_ARM_Half:             // ARM_RELOC_HALF
1119        case macho::RIT_ARM_HalfDifference: { // ARM_RELOC_HALF_SECTDIFF
1120          // Half relocations steal a bit from the length field to encode
1121          // whether this is an upper16 or a lower16 relocation.
1122          bool isUpper = getAnyRelocationLength(RE) >> 1;
1123
1124          if (isUpper)
1125            fmt << ":upper16:(";
1126          else
1127            fmt << ":lower16:(";
1128          printRelocationTargetName(this, RE, fmt);
1129
1130          DataRefImpl RelNext = Rel;
1131          RelNext.d.a++;
1132          macho::RelocationEntry RENext = getRelocation(RelNext);
1133
1134          // ARM half relocs must be followed by a relocation of type
1135          // ARM_RELOC_PAIR.
1136          unsigned RType = getAnyRelocationType(RENext);
1137          if (RType != 1)
1138            report_fatal_error("Expected ARM_RELOC_PAIR after "
1139                               "GENERIC_RELOC_HALF");
1140
1141          // NOTE: The half of the target virtual address is stashed in the
1142          // address field of the secondary relocation, but we can't reverse
1143          // engineer the constant offset from it without decoding the movw/movt
1144          // instruction to find the other half in its immediate field.
1145
1146          // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1147          // symbol/section pointer of the follow-on relocation.
1148          if (Type == macho::RIT_ARM_HalfDifference) {
1149            fmt << "-";
1150            printRelocationTargetName(this, RENext, fmt);
1151          }
1152
1153          fmt << ")";
1154          break;
1155        }
1156        default: {
1157          printRelocationTargetName(this, RE, fmt);
1158        }
1159      }
1160    }
1161  } else
1162    printRelocationTargetName(this, RE, fmt);
1163
1164  fmt.flush();
1165  Result.append(fmtbuf.begin(), fmtbuf.end());
1166  return object_error::success;
1167}
1168
1169error_code
1170MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1171  unsigned Arch = getArch();
1172  uint64_t Type;
1173  getRelocationType(Rel, Type);
1174
1175  Result = false;
1176
1177  // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1178  // is always hidden.
1179  if (Arch == Triple::x86 || Arch == Triple::arm) {
1180    if (Type == macho::RIT_Pair) Result = true;
1181  } else if (Arch == Triple::x86_64) {
1182    // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1183    // an X864_64_RELOC_SUBTRACTOR.
1184    if (Type == macho::RIT_X86_64_Unsigned && Rel.d.a > 0) {
1185      DataRefImpl RelPrev = Rel;
1186      RelPrev.d.a--;
1187      uint64_t PrevType;
1188      getRelocationType(RelPrev, PrevType);
1189      if (PrevType == macho::RIT_X86_64_Subtractor)
1190        Result = true;
1191    }
1192  }
1193
1194  return object_error::success;
1195}
1196
1197error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1198                                           LibraryRef &Res) const {
1199  report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1200}
1201
1202error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1203                                           StringRef &Res) const {
1204  report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1205}
1206
1207symbol_iterator MachOObjectFile::begin_symbols() const {
1208  DataRefImpl DRI;
1209  if (!SymtabLoadCmd)
1210    return symbol_iterator(SymbolRef(DRI, this));
1211
1212  macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1213  DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.SymbolTableOffset));
1214  return symbol_iterator(SymbolRef(DRI, this));
1215}
1216
1217symbol_iterator MachOObjectFile::end_symbols() const {
1218  DataRefImpl DRI;
1219  if (!SymtabLoadCmd)
1220    return symbol_iterator(SymbolRef(DRI, this));
1221
1222  macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1223  unsigned SymbolTableEntrySize = is64Bit() ?
1224    sizeof(macho::Symbol64TableEntry) :
1225    sizeof(macho::SymbolTableEntry);
1226  unsigned Offset = Symtab.SymbolTableOffset +
1227    Symtab.NumSymbolTableEntries * SymbolTableEntrySize;
1228  DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1229  return symbol_iterator(SymbolRef(DRI, this));
1230}
1231
1232symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
1233  // TODO: implement
1234  report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1235}
1236
1237symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
1238  // TODO: implement
1239  report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1240}
1241
1242section_iterator MachOObjectFile::begin_sections() const {
1243  DataRefImpl DRI;
1244  return section_iterator(SectionRef(DRI, this));
1245}
1246
1247section_iterator MachOObjectFile::end_sections() const {
1248  DataRefImpl DRI;
1249  DRI.d.a = Sections.size();
1250  return section_iterator(SectionRef(DRI, this));
1251}
1252
1253library_iterator MachOObjectFile::begin_libraries_needed() const {
1254  // TODO: implement
1255  report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1256}
1257
1258library_iterator MachOObjectFile::end_libraries_needed() const {
1259  // TODO: implement
1260  report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1261}
1262
1263uint8_t MachOObjectFile::getBytesInAddress() const {
1264  return is64Bit() ? 8 : 4;
1265}
1266
1267StringRef MachOObjectFile::getFileFormatName() const {
1268  unsigned CPUType = getCPUType(this);
1269  if (!is64Bit()) {
1270    switch (CPUType) {
1271    case llvm::MachO::CPUTypeI386:
1272      return "Mach-O 32-bit i386";
1273    case llvm::MachO::CPUTypeARM:
1274      return "Mach-O arm";
1275    case llvm::MachO::CPUTypePowerPC:
1276      return "Mach-O 32-bit ppc";
1277    default:
1278      assert((CPUType & llvm::MachO::CPUArchABI64) == 0 &&
1279             "64-bit object file when we're not 64-bit?");
1280      return "Mach-O 32-bit unknown";
1281    }
1282  }
1283
1284  // Make sure the cpu type has the correct mask.
1285  assert((CPUType & llvm::MachO::CPUArchABI64)
1286	 == llvm::MachO::CPUArchABI64 &&
1287	 "32-bit object file when we're 64-bit?");
1288
1289  switch (CPUType) {
1290  case llvm::MachO::CPUTypeX86_64:
1291    return "Mach-O 64-bit x86-64";
1292  case llvm::MachO::CPUTypePowerPC64:
1293    return "Mach-O 64-bit ppc64";
1294  default:
1295    return "Mach-O 64-bit unknown";
1296  }
1297}
1298
1299unsigned MachOObjectFile::getArch() const {
1300  switch (getCPUType(this)) {
1301  case llvm::MachO::CPUTypeI386:
1302    return Triple::x86;
1303  case llvm::MachO::CPUTypeX86_64:
1304    return Triple::x86_64;
1305  case llvm::MachO::CPUTypeARM:
1306    return Triple::arm;
1307  case llvm::MachO::CPUTypePowerPC:
1308    return Triple::ppc;
1309  case llvm::MachO::CPUTypePowerPC64:
1310    return Triple::ppc64;
1311  default:
1312    return Triple::UnknownArch;
1313  }
1314}
1315
1316StringRef MachOObjectFile::getLoadName() const {
1317  // TODO: Implement
1318  report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1319}
1320
1321relocation_iterator MachOObjectFile::getSectionRelBegin(unsigned Index) const {
1322  DataRefImpl DRI;
1323  DRI.d.a = Index;
1324  return getSectionRelBegin(DRI);
1325}
1326
1327relocation_iterator MachOObjectFile::getSectionRelEnd(unsigned Index) const {
1328  DataRefImpl DRI;
1329  DRI.d.a = Index;
1330  return getSectionRelEnd(DRI);
1331}
1332
1333StringRef
1334MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1335  ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1336  return parseSegmentOrSectionName(Raw.data());
1337}
1338
1339ArrayRef<char>
1340MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1341  const SectionBase *Base =
1342    reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1343  return ArrayRef<char>(Base->Name);
1344}
1345
1346ArrayRef<char>
1347MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1348  const SectionBase *Base =
1349    reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1350  return ArrayRef<char>(Base->SegmentName);
1351}
1352
1353bool
1354MachOObjectFile::isRelocationScattered(const macho::RelocationEntry &RE)
1355  const {
1356  if (getCPUType(this) == llvm::MachO::CPUTypeX86_64)
1357    return false;
1358  return getPlainRelocationAddress(RE) & macho::RF_Scattered;
1359}
1360
1361unsigned MachOObjectFile::getPlainRelocationSymbolNum(const macho::RelocationEntry &RE) const {
1362  if (isLittleEndian())
1363    return RE.Word1 & 0xffffff;
1364  return RE.Word1 >> 8;
1365}
1366
1367bool MachOObjectFile::getPlainRelocationExternal(const macho::RelocationEntry &RE) const {
1368  if (isLittleEndian())
1369    return (RE.Word1 >> 27) & 1;
1370  return (RE.Word1 >> 4) & 1;
1371}
1372
1373bool
1374MachOObjectFile::getScatteredRelocationScattered(const macho::RelocationEntry &RE) const {
1375  return RE.Word0 >> 31;
1376}
1377
1378uint32_t
1379MachOObjectFile::getScatteredRelocationValue(const macho::RelocationEntry &RE) const {
1380  return RE.Word1;
1381}
1382
1383unsigned
1384MachOObjectFile::getAnyRelocationAddress(const macho::RelocationEntry &RE) const {
1385  if (isRelocationScattered(RE))
1386    return getScatteredRelocationAddress(RE);
1387  return getPlainRelocationAddress(RE);
1388}
1389
1390unsigned
1391MachOObjectFile::getAnyRelocationPCRel(const macho::RelocationEntry &RE) const {
1392  if (isRelocationScattered(RE))
1393    return getScatteredRelocationPCRel(this, RE);
1394  return getPlainRelocationPCRel(this, RE);
1395}
1396
1397unsigned
1398MachOObjectFile::getAnyRelocationLength(const macho::RelocationEntry &RE) const {
1399  if (isRelocationScattered(RE))
1400    return getScatteredRelocationLength(RE);
1401  return getPlainRelocationLength(this, RE);
1402}
1403
1404unsigned
1405MachOObjectFile::getAnyRelocationType(const macho::RelocationEntry &RE) const {
1406  if (isRelocationScattered(RE))
1407    return getScatteredRelocationType(RE);
1408  return getPlainRelocationType(this, RE);
1409}
1410
1411SectionRef
1412MachOObjectFile::getRelocationSection(const macho::RelocationEntry &RE) const {
1413  if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1414    return *end_sections();
1415  unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1416  DataRefImpl DRI;
1417  DRI.d.a = SecNum;
1418  return SectionRef(DRI, this);
1419}
1420
1421MachOObjectFile::LoadCommandInfo
1422MachOObjectFile::getFirstLoadCommandInfo() const {
1423  MachOObjectFile::LoadCommandInfo Load;
1424
1425  unsigned HeaderSize = is64Bit() ? macho::Header64Size : macho::Header32Size;
1426  Load.Ptr = getPtr(this, HeaderSize);
1427  Load.C = getStruct<macho::LoadCommand>(this, Load.Ptr);
1428  return Load;
1429}
1430
1431MachOObjectFile::LoadCommandInfo
1432MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1433  MachOObjectFile::LoadCommandInfo Next;
1434  Next.Ptr = L.Ptr + L.C.Size;
1435  Next.C = getStruct<macho::LoadCommand>(this, Next.Ptr);
1436  return Next;
1437}
1438
1439macho::Section MachOObjectFile::getSection(DataRefImpl DRI) const {
1440  return getStruct<macho::Section>(this, Sections[DRI.d.a]);
1441}
1442
1443macho::Section64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1444  return getStruct<macho::Section64>(this, Sections[DRI.d.a]);
1445}
1446
1447macho::Section MachOObjectFile::getSection(const LoadCommandInfo &L,
1448                                           unsigned Index) const {
1449  const char *Sec = getSectionPtr(this, L, Index);
1450  return getStruct<macho::Section>(this, Sec);
1451}
1452
1453macho::Section64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1454                                               unsigned Index) const {
1455  const char *Sec = getSectionPtr(this, L, Index);
1456  return getStruct<macho::Section64>(this, Sec);
1457}
1458
1459macho::SymbolTableEntry
1460MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1461  const char *P = reinterpret_cast<const char *>(DRI.p);
1462  return getStruct<macho::SymbolTableEntry>(this, P);
1463}
1464
1465macho::Symbol64TableEntry
1466MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1467  const char *P = reinterpret_cast<const char *>(DRI.p);
1468  return getStruct<macho::Symbol64TableEntry>(this, P);
1469}
1470
1471macho::LinkeditDataLoadCommand
1472MachOObjectFile::getLinkeditDataLoadCommand(const MachOObjectFile::LoadCommandInfo &L) const {
1473  return getStruct<macho::LinkeditDataLoadCommand>(this, L.Ptr);
1474}
1475
1476macho::SegmentLoadCommand
1477MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1478  return getStruct<macho::SegmentLoadCommand>(this, L.Ptr);
1479}
1480
1481macho::Segment64LoadCommand
1482MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1483  return getStruct<macho::Segment64LoadCommand>(this, L.Ptr);
1484}
1485
1486macho::LinkerOptionsLoadCommand
1487MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1488  return getStruct<macho::LinkerOptionsLoadCommand>(this, L.Ptr);
1489}
1490
1491macho::RelocationEntry
1492MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1493  const char *P = reinterpret_cast<const char *>(Rel.p);
1494  return getStruct<macho::RelocationEntry>(this, P);
1495}
1496
1497macho::Header MachOObjectFile::getHeader() const {
1498  return getStruct<macho::Header>(this, getPtr(this, 0));
1499}
1500
1501macho::Header64Ext MachOObjectFile::getHeader64Ext() const {
1502  return
1503    getStruct<macho::Header64Ext>(this, getPtr(this, sizeof(macho::Header)));
1504}
1505
1506macho::IndirectSymbolTableEntry MachOObjectFile::getIndirectSymbolTableEntry(
1507                                          const macho::DysymtabLoadCommand &DLC,
1508                                          unsigned Index) const {
1509  uint64_t Offset = DLC.IndirectSymbolTableOffset +
1510    Index * sizeof(macho::IndirectSymbolTableEntry);
1511  return getStruct<macho::IndirectSymbolTableEntry>(this, getPtr(this, Offset));
1512}
1513
1514macho::DataInCodeTableEntry
1515MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1516                                         unsigned Index) const {
1517  uint64_t Offset = DataOffset + Index * sizeof(macho::DataInCodeTableEntry);
1518  return getStruct<macho::DataInCodeTableEntry>(this, getPtr(this, Offset));
1519}
1520
1521macho::SymtabLoadCommand MachOObjectFile::getSymtabLoadCommand() const {
1522  return getStruct<macho::SymtabLoadCommand>(this, SymtabLoadCmd);
1523}
1524
1525macho::DysymtabLoadCommand MachOObjectFile::getDysymtabLoadCommand() const {
1526  return getStruct<macho::DysymtabLoadCommand>(this, DysymtabLoadCmd);
1527}
1528
1529StringRef MachOObjectFile::getStringTableData() const {
1530  macho::SymtabLoadCommand S = getSymtabLoadCommand();
1531  return getData().substr(S.StringTableOffset, S.StringTableSize);
1532}
1533
1534bool MachOObjectFile::is64Bit() const {
1535  return getType() == getMachOType(false, true) ||
1536    getType() == getMachOType(true, true);
1537}
1538
1539void MachOObjectFile::ReadULEB128s(uint64_t Index,
1540                                   SmallVectorImpl<uint64_t> &Out) const {
1541  DataExtractor extractor(ObjectFile::getData(), true, 0);
1542
1543  uint32_t offset = Index;
1544  uint64_t data = 0;
1545  while (uint64_t delta = extractor.getULEB128(&offset)) {
1546    data += delta;
1547    Out.push_back(data);
1548  }
1549}
1550
1551ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
1552  StringRef Magic = Buffer->getBuffer().slice(0, 4);
1553  error_code ec;
1554  ObjectFile *Ret;
1555  if (Magic == "\xFE\xED\xFA\xCE")
1556    Ret = new MachOObjectFile(Buffer, false, false, ec);
1557  else if (Magic == "\xCE\xFA\xED\xFE")
1558    Ret = new MachOObjectFile(Buffer, true, false, ec);
1559  else if (Magic == "\xFE\xED\xFA\xCF")
1560    Ret = new MachOObjectFile(Buffer, false, true, ec);
1561  else if (Magic == "\xCF\xFA\xED\xFE")
1562    Ret = new MachOObjectFile(Buffer, true, true, ec);
1563  else
1564    return NULL;
1565
1566  if (ec)
1567    return NULL;
1568  return Ret;
1569}
1570
1571} // end namespace object
1572} // end namespace llvm
1573