xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 04d3f4960816c390ff02c92722182044095ec5a3) 
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 
26 using namespace llvm;
27 using namespace object;
28 
29 namespace llvm {
30 namespace object {
31 
32 struct SymbolTableEntryBase {
33   uint32_t StringIndex;
34   uint8_t Type;
35   uint8_t SectionIndex;
36   uint16_t Flags;
37 };
38 
39 struct SectionBase {
40   char Name[16];
41   char SegmentName[16];
42 };
43 
44 template<typename T>
45 static void SwapValue(T &Value) {
46   Value = sys::SwapByteOrder(Value);
47 }
48 
49 template<typename T>
50 static void SwapStruct(T &Value);
51 
52 template<>
53 void SwapStruct(macho::RelocationEntry &H) {
54   SwapValue(H.Word0);
55   SwapValue(H.Word1);
56 }
57 
58 template<>
59 void SwapStruct(macho::LoadCommand &L) {
60   SwapValue(L.Type);
61   SwapValue(L.Size);
62 }
63 
64 template<>
65 void SwapStruct(SymbolTableEntryBase &S) {
66   SwapValue(S.StringIndex);
67   SwapValue(S.Flags);
68 }
69 
70 template<>
71 void 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 
83 template<>
84 void 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 
97 template<>
98 void SwapStruct(macho::SymbolTableEntry &S) {
99   SwapValue(S.StringIndex);
100   SwapValue(S.Flags);
101   SwapValue(S.Value);
102 }
103 
104 template<>
105 void SwapStruct(macho::Symbol64TableEntry &S) {
106   SwapValue(S.StringIndex);
107   SwapValue(S.Flags);
108   SwapValue(S.Value);
109 }
110 
111 template<>
112 void 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 
122 template<>
123 void SwapStruct(macho::SymtabLoadCommand &C) {
124   SwapValue(C.Type);
125   SwapValue(C.Size);
126   SwapValue(C.SymbolTableOffset);
127   SwapValue(C.NumSymbolTableEntries);
128   SwapValue(C.StringTableOffset);
129   SwapValue(C.StringTableSize);
130 }
131 
132 template<>
133 void SwapStruct(macho::LinkeditDataLoadCommand &C) {
134   SwapValue(C.Type);
135   SwapValue(C.Size);
136   SwapValue(C.DataOffset);
137   SwapValue(C.DataSize);
138 }
139 
140 template<>
141 void SwapStruct(macho::SegmentLoadCommand &C) {
142   SwapValue(C.Type);
143   SwapValue(C.Size);
144   SwapValue(C.VMAddress);
145   SwapValue(C.VMSize);
146   SwapValue(C.FileOffset);
147   SwapValue(C.FileSize);
148   SwapValue(C.MaxVMProtection);
149   SwapValue(C.InitialVMProtection);
150   SwapValue(C.NumSections);
151   SwapValue(C.Flags);
152 }
153 
154 template<>
155 void SwapStruct(macho::Segment64LoadCommand &C) {
156   SwapValue(C.Type);
157   SwapValue(C.Size);
158   SwapValue(C.VMAddress);
159   SwapValue(C.VMSize);
160   SwapValue(C.FileOffset);
161   SwapValue(C.FileSize);
162   SwapValue(C.MaxVMProtection);
163   SwapValue(C.InitialVMProtection);
164   SwapValue(C.NumSections);
165   SwapValue(C.Flags);
166 }
167 
168 template<typename T>
169 T getStruct(const MachOObjectFile *O, const char *P) {
170   T Cmd;
171   memcpy(&Cmd, P, sizeof(T));
172   if (O->isLittleEndian() != sys::IsLittleEndianHost)
173     SwapStruct(Cmd);
174   return Cmd;
175 }
176 
177 static macho::SegmentLoadCommand
178 getSegmentLoadCommand(const MachOObjectFile *O,
179                       const MachOObjectFile::LoadCommandInfo &L) {
180   return getStruct<macho::SegmentLoadCommand>(O, L.Ptr);
181 }
182 
183 static macho::Segment64LoadCommand
184 getSegment64LoadCommand(const MachOObjectFile *O,
185                         const MachOObjectFile::LoadCommandInfo &L) {
186   return getStruct<macho::Segment64LoadCommand>(O, L.Ptr);
187 }
188 
189 static uint32_t
190 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
191                                  const MachOObjectFile::LoadCommandInfo &L) {
192   if (O->is64Bit()) {
193     macho::Segment64LoadCommand S = getSegment64LoadCommand(O, L);
194     return S.NumSections;
195   }
196   macho::SegmentLoadCommand S = getSegmentLoadCommand(O, L);
197   return S.NumSections;
198 }
199 
200 static const SectionBase *
201 getSectionBase(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
202                unsigned Sec) {
203   uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
204 
205   bool Is64 = O->is64Bit();
206   unsigned SegmentLoadSize = Is64 ? sizeof(macho::Segment64LoadCommand) :
207                                     sizeof(macho::SegmentLoadCommand);
208   unsigned SectionSize = Is64 ? sizeof(macho::Section64) :
209                                 sizeof(macho::Section);
210 
211   uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
212   return reinterpret_cast<const SectionBase*>(SectionAddr);
213 }
214 
215 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
216   return O->getData().substr(Offset, 1).data();
217 }
218 
219 static SymbolTableEntryBase
220 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
221   const char *P = reinterpret_cast<const char *>(DRI.p);
222   return getStruct<SymbolTableEntryBase>(O, P);
223 }
224 
225 static StringRef parseSegmentOrSectionName(const char *P) {
226   if (P[15] == 0)
227     // Null terminated.
228     return P;
229   // Not null terminated, so this is a 16 char string.
230   return StringRef(P, 16);
231 }
232 
233 // Helper to advance a section or symbol iterator multiple increments at a time.
234 template<class T>
235 static error_code advance(T &it, size_t Val) {
236   error_code ec;
237   while (Val--) {
238     it.increment(ec);
239   }
240   return ec;
241 }
242 
243 template<class T>
244 static void advanceTo(T &it, size_t Val) {
245   if (error_code ec = advance(it, Val))
246     report_fatal_error(ec.message());
247 }
248 
249 static unsigned getCPUType(const MachOObjectFile *O) {
250   return O->getHeader().CPUType;
251 }
252 
253 static void printRelocationTargetName(const MachOObjectFile *O,
254                                       const macho::RelocationEntry &RE,
255                                       raw_string_ostream &fmt) {
256   bool IsScattered = O->isRelocationScattered(RE);
257 
258   // Target of a scattered relocation is an address.  In the interest of
259   // generating pretty output, scan through the symbol table looking for a
260   // symbol that aligns with that address.  If we find one, print it.
261   // Otherwise, we just print the hex address of the target.
262   if (IsScattered) {
263     uint32_t Val = O->getPlainRelocationSymbolNum(RE);
264 
265     error_code ec;
266     for (symbol_iterator SI = O->begin_symbols(), SE = O->end_symbols();
267          SI != SE; SI.increment(ec)) {
268       if (ec) report_fatal_error(ec.message());
269 
270       uint64_t Addr;
271       StringRef Name;
272 
273       if ((ec = SI->getAddress(Addr)))
274         report_fatal_error(ec.message());
275       if (Addr != Val) continue;
276       if ((ec = SI->getName(Name)))
277         report_fatal_error(ec.message());
278       fmt << Name;
279       return;
280     }
281 
282     // If we couldn't find a symbol that this relocation refers to, try
283     // to find a section beginning instead.
284     for (section_iterator SI = O->begin_sections(), SE = O->end_sections();
285          SI != SE; SI.increment(ec)) {
286       if (ec) report_fatal_error(ec.message());
287 
288       uint64_t Addr;
289       StringRef Name;
290 
291       if ((ec = SI->getAddress(Addr)))
292         report_fatal_error(ec.message());
293       if (Addr != Val) continue;
294       if ((ec = SI->getName(Name)))
295         report_fatal_error(ec.message());
296       fmt << Name;
297       return;
298     }
299 
300     fmt << format("0x%x", Val);
301     return;
302   }
303 
304   StringRef S;
305   bool isExtern = O->getPlainRelocationExternal(RE);
306   uint64_t Val = O->getAnyRelocationAddress(RE);
307 
308   if (isExtern) {
309     symbol_iterator SI = O->begin_symbols();
310     advanceTo(SI, Val);
311     SI->getName(S);
312   } else {
313     section_iterator SI = O->begin_sections();
314     advanceTo(SI, Val);
315     SI->getName(S);
316   }
317 
318   fmt << S;
319 }
320 
321 static uint32_t getPlainRelocationAddress(const macho::RelocationEntry &RE) {
322   return RE.Word0;
323 }
324 
325 static unsigned
326 getScatteredRelocationAddress(const macho::RelocationEntry &RE) {
327   return RE.Word0 & 0xffffff;
328 }
329 
330 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
331                                     const macho::RelocationEntry &RE) {
332   if (O->isLittleEndian())
333     return (RE.Word1 >> 24) & 1;
334   return (RE.Word1 >> 7) & 1;
335 }
336 
337 static bool
338 getScatteredRelocationPCRel(const MachOObjectFile *O,
339                             const macho::RelocationEntry &RE) {
340   return (RE.Word0 >> 30) & 1;
341 }
342 
343 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
344                                          const macho::RelocationEntry &RE) {
345   if (O->isLittleEndian())
346     return (RE.Word1 >> 25) & 3;
347   return (RE.Word1 >> 5) & 3;
348 }
349 
350 static unsigned
351 getScatteredRelocationLength(const macho::RelocationEntry &RE) {
352   return (RE.Word0 >> 28) & 3;
353 }
354 
355 static unsigned getPlainRelocationType(const MachOObjectFile *O,
356                                        const macho::RelocationEntry &RE) {
357   if (O->isLittleEndian())
358     return RE.Word1 >> 28;
359   return RE.Word1 & 0xf;
360 }
361 
362 static unsigned getScatteredRelocationType(const macho::RelocationEntry &RE) {
363   return (RE.Word0 >> 24) & 0xf;
364 }
365 
366 static uint32_t getSectionFlags(const MachOObjectFile *O,
367                                 DataRefImpl Sec) {
368   if (O->is64Bit()) {
369     macho::Section64 Sect = O->getSection64(Sec);
370     return Sect.Flags;
371   }
372   macho::Section Sect = O->getSection(Sec);
373   return Sect.Flags;
374 }
375 
376 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
377                                  bool IsLittleEndian, bool Is64bits,
378                                  error_code &ec)
379     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
380       SymtabLoadCmd(NULL) {
381   uint32_t LoadCommandCount = this->getHeader().NumLoadCommands;
382   macho::LoadCommandType SegmentLoadType = is64Bit() ?
383     macho::LCT_Segment64 : macho::LCT_Segment;
384 
385   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
386   for (unsigned I = 0; ; ++I) {
387     if (Load.C.Type == macho::LCT_Symtab) {
388       assert(!SymtabLoadCmd && "Multiple symbol tables");
389       SymtabLoadCmd = Load.Ptr;
390     }
391 
392     if (Load.C.Type == SegmentLoadType) {
393       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
394       for (unsigned J = 0; J < NumSections; ++J) {
395         const SectionBase *Sec = getSectionBase(this, Load, J);
396         Sections.push_back(reinterpret_cast<const char*>(Sec));
397       }
398     }
399 
400     if (I == LoadCommandCount - 1)
401       break;
402     else
403       Load = getNextLoadCommandInfo(Load);
404   }
405 }
406 
407 error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
408                                           SymbolRef &Res) const {
409   unsigned SymbolTableEntrySize = is64Bit() ?
410     sizeof(macho::Symbol64TableEntry) :
411     sizeof(macho::SymbolTableEntry);
412   Symb.p += SymbolTableEntrySize;
413   Res = SymbolRef(Symb, this);
414   return object_error::success;
415 }
416 
417 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
418                                           StringRef &Res) const {
419   macho::SymtabLoadCommand S = getSymtabLoadCommand();
420   const char *StringTable = getPtr(this, S.StringTableOffset);
421   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
422   const char *Start = &StringTable[Entry.StringIndex];
423   Res = StringRef(Start);
424   return object_error::success;
425 }
426 
427 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
428                                              uint64_t &Res) const {
429   if (is64Bit()) {
430     macho::Symbol64TableEntry Entry = getSymbol64TableEntry(Symb);
431     Res = Entry.Value;
432   } else {
433     macho::SymbolTableEntry Entry = getSymbolTableEntry(Symb);
434     Res = Entry.Value;
435   }
436   return object_error::success;
437 }
438 
439 error_code
440 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
441                                      uint64_t &Res) const {
442   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
443   getSymbolAddress(Symb, Res);
444   if (Entry.SectionIndex) {
445     uint64_t Delta;
446     DataRefImpl SecRel;
447     SecRel.d.a = Entry.SectionIndex-1;
448     if (is64Bit()) {
449       macho::Section64 Sec = getSection64(SecRel);
450       Delta = Sec.Offset - Sec.Address;
451     } else {
452       macho::Section Sec = getSection(SecRel);
453       Delta = Sec.Offset - Sec.Address;
454     }
455 
456     Res += Delta;
457   }
458 
459   return object_error::success;
460 }
461 
462 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
463                                           uint64_t &Result) const {
464   uint64_t BeginOffset;
465   uint64_t EndOffset = 0;
466   uint8_t SectionIndex;
467 
468   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
469   uint64_t Value;
470   getSymbolAddress(DRI, Value);
471 
472   BeginOffset = Value;
473 
474   SectionIndex = Entry.SectionIndex;
475   if (!SectionIndex) {
476     uint32_t flags = SymbolRef::SF_None;
477     this->getSymbolFlags(DRI, flags);
478     if (flags & SymbolRef::SF_Common)
479       Result = Value;
480     else
481       Result = UnknownAddressOrSize;
482     return object_error::success;
483   }
484   // Unfortunately symbols are unsorted so we need to touch all
485   // symbols from load command
486   error_code ec;
487   for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E;
488        I.increment(ec)) {
489     DataRefImpl DRI = I->getRawDataRefImpl();
490     Entry = getSymbolTableEntryBase(this, DRI);
491     getSymbolAddress(DRI, Value);
492     if (Entry.SectionIndex == SectionIndex && Value > BeginOffset)
493       if (!EndOffset || Value < EndOffset)
494         EndOffset = Value;
495   }
496   if (!EndOffset) {
497     uint64_t Size;
498     DataRefImpl Sec;
499     Sec.d.a = SectionIndex-1;
500     getSectionSize(Sec, Size);
501     getSectionAddress(Sec, EndOffset);
502     EndOffset += Size;
503   }
504   Result = EndOffset - BeginOffset;
505   return object_error::success;
506 }
507 
508 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
509                                           SymbolRef::Type &Res) const {
510   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
511   uint8_t n_type = Entry.Type;
512 
513   Res = SymbolRef::ST_Other;
514 
515   // If this is a STAB debugging symbol, we can do nothing more.
516   if (n_type & MachO::NlistMaskStab) {
517     Res = SymbolRef::ST_Debug;
518     return object_error::success;
519   }
520 
521   switch (n_type & MachO::NlistMaskType) {
522     case MachO::NListTypeUndefined :
523       Res = SymbolRef::ST_Unknown;
524       break;
525     case MachO::NListTypeSection :
526       Res = SymbolRef::ST_Function;
527       break;
528   }
529   return object_error::success;
530 }
531 
532 error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
533                                                 char &Res) const {
534   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
535   uint8_t Type = Entry.Type;
536   uint16_t Flags = Entry.Flags;
537 
538   char Char;
539   switch (Type & macho::STF_TypeMask) {
540     case macho::STT_Undefined:
541       Char = 'u';
542       break;
543     case macho::STT_Absolute:
544     case macho::STT_Section:
545       Char = 's';
546       break;
547     default:
548       Char = '?';
549       break;
550   }
551 
552   if (Flags & (macho::STF_External | macho::STF_PrivateExtern))
553     Char = toupper(static_cast<unsigned char>(Char));
554   Res = Char;
555   return object_error::success;
556 }
557 
558 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
559                                            uint32_t &Result) const {
560   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
561 
562   uint8_t MachOType = Entry.Type;
563   uint16_t MachOFlags = Entry.Flags;
564 
565   // TODO: Correctly set SF_ThreadLocal
566   Result = SymbolRef::SF_None;
567 
568   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
569     Result |= SymbolRef::SF_Undefined;
570 
571   if (MachOFlags & macho::STF_StabsEntryMask)
572     Result |= SymbolRef::SF_FormatSpecific;
573 
574   if (MachOType & MachO::NlistMaskExternal) {
575     Result |= SymbolRef::SF_Global;
576     if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
577       Result |= SymbolRef::SF_Common;
578   }
579 
580   if (MachOFlags & (MachO::NListDescWeakRef | MachO::NListDescWeakDef))
581     Result |= SymbolRef::SF_Weak;
582 
583   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeAbsolute)
584     Result |= SymbolRef::SF_Absolute;
585 
586   return object_error::success;
587 }
588 
589 error_code
590 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
591                                   section_iterator &Res) const {
592   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
593   uint8_t index = Entry.SectionIndex;
594 
595   if (index == 0) {
596     Res = end_sections();
597   } else {
598     DataRefImpl DRI;
599     DRI.d.a = index - 1;
600     Res = section_iterator(SectionRef(DRI, this));
601   }
602 
603   return object_error::success;
604 }
605 
606 error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
607                                            uint64_t &Val) const {
608   report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
609 }
610 
611 error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
612                                            SectionRef &Res) const {
613   Sec.d.a++;
614   Res = SectionRef(Sec, this);
615   return object_error::success;
616 }
617 
618 error_code
619 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
620   ArrayRef<char> Raw = getSectionRawName(Sec);
621   Result = parseSegmentOrSectionName(Raw.data());
622   return object_error::success;
623 }
624 
625 error_code
626 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
627   if (is64Bit()) {
628     macho::Section64 Sect = getSection64(Sec);
629     Res = Sect.Address;
630   } else {
631     macho::Section Sect = getSection(Sec);
632     Res = Sect.Address;
633   }
634   return object_error::success;
635 }
636 
637 error_code
638 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
639   if (is64Bit()) {
640     macho::Section64 Sect = getSection64(Sec);
641     Res = Sect.Size;
642   } else {
643     macho::Section Sect = getSection(Sec);
644     Res = Sect.Size;
645   }
646 
647   return object_error::success;
648 }
649 
650 error_code
651 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
652   uint32_t Offset;
653   uint64_t Size;
654 
655   if (is64Bit()) {
656     macho::Section64 Sect = getSection64(Sec);
657     Offset = Sect.Offset;
658     Size = Sect.Size;
659   } else {
660     macho::Section Sect =getSection(Sec);
661     Offset = Sect.Offset;
662     Size = Sect.Size;
663   }
664 
665   Res = this->getData().substr(Offset, Size);
666   return object_error::success;
667 }
668 
669 error_code
670 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
671   uint32_t Align;
672   if (is64Bit()) {
673     macho::Section64 Sect = getSection64(Sec);
674     Align = Sect.Align;
675   } else {
676     macho::Section Sect = getSection(Sec);
677     Align = Sect.Align;
678   }
679 
680   Res = uint64_t(1) << Align;
681   return object_error::success;
682 }
683 
684 error_code
685 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
686   uint32_t Flags = getSectionFlags(this, Sec);
687   Res = Flags & macho::SF_PureInstructions;
688   return object_error::success;
689 }
690 
691 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
692   // FIXME: Unimplemented.
693   Result = false;
694   return object_error::success;
695 }
696 
697 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
698   // FIXME: Unimplemented.
699   Result = false;
700   return object_error::success;
701 }
702 
703 error_code
704 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
705                                                bool &Result) const {
706   // FIXME: Unimplemented.
707   Result = true;
708   return object_error::success;
709 }
710 
711 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
712                                              bool &Result) const {
713   // FIXME: Unimplemented.
714   Result = false;
715   return object_error::success;
716 }
717 
718 error_code
719 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
720   uint32_t Flags = getSectionFlags(this, Sec);
721   unsigned SectionType = Flags & MachO::SectionFlagMaskSectionType;
722   Res = SectionType == MachO::SectionTypeZeroFill ||
723     SectionType == MachO::SectionTypeZeroFillLarge;
724   return object_error::success;
725 }
726 
727 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
728                                                   bool &Result) const {
729   // Consider using the code from isSectionText to look for __const sections.
730   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
731   // to use section attributes to distinguish code from data.
732 
733   // FIXME: Unimplemented.
734   Result = false;
735   return object_error::success;
736 }
737 
738 error_code
739 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
740                                        bool &Result) const {
741   SymbolRef::Type ST;
742   this->getSymbolType(Symb, ST);
743   if (ST == SymbolRef::ST_Unknown) {
744     Result = false;
745     return object_error::success;
746   }
747 
748   uint64_t SectBegin, SectEnd;
749   getSectionAddress(Sec, SectBegin);
750   getSectionSize(Sec, SectEnd);
751   SectEnd += SectBegin;
752 
753   uint64_t SymAddr;
754   getSymbolAddress(Symb, SymAddr);
755   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
756 
757   return object_error::success;
758 }
759 
760 relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
761   uint32_t Offset;
762   if (is64Bit()) {
763     macho::Section64 Sect = getSection64(Sec);
764     Offset = Sect.RelocationTableOffset;
765   } else {
766     macho::Section Sect = getSection(Sec);
767     Offset = Sect.RelocationTableOffset;
768   }
769 
770   DataRefImpl Ret;
771   Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
772   return relocation_iterator(RelocationRef(Ret, this));
773 }
774 
775 relocation_iterator
776 MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
777   uint32_t Offset;
778   uint32_t Num;
779   if (is64Bit()) {
780     macho::Section64 Sect = getSection64(Sec);
781     Offset = Sect.RelocationTableOffset;
782     Num = Sect.NumRelocationTableEntries;
783   } else {
784     macho::Section Sect = getSection(Sec);
785     Offset = Sect.RelocationTableOffset;
786     Num = Sect.NumRelocationTableEntries;
787   }
788 
789   const macho::RelocationEntry *P =
790     reinterpret_cast<const macho::RelocationEntry*>(getPtr(this, Offset));
791 
792   DataRefImpl Ret;
793   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
794   return relocation_iterator(RelocationRef(Ret, this));
795 }
796 
797 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
798                                               RelocationRef &Res) const {
799   const macho::RelocationEntry *P =
800     reinterpret_cast<const macho::RelocationEntry *>(Rel.p);
801   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
802   Res = RelocationRef(Rel, this);
803   return object_error::success;
804 }
805 
806 error_code
807 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
808   report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
809 }
810 
811 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
812                                                 uint64_t &Res) const {
813   macho::RelocationEntry RE = getRelocation(Rel);
814   Res = getAnyRelocationAddress(RE);
815   return object_error::success;
816 }
817 
818 error_code
819 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel, SymbolRef &Res) const {
820   macho::RelocationEntry RE = getRelocation(Rel);
821   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
822   bool isExtern = getPlainRelocationExternal(RE);
823   if (!isExtern) {
824     Res = *end_symbols();
825     return object_error::success;
826   }
827 
828   macho::SymtabLoadCommand S = getSymtabLoadCommand();
829   unsigned SymbolTableEntrySize = is64Bit() ?
830     sizeof(macho::Symbol64TableEntry) :
831     sizeof(macho::SymbolTableEntry);
832   uint64_t Offset = S.SymbolTableOffset + SymbolIdx * SymbolTableEntrySize;
833   DataRefImpl Sym;
834   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
835   Res = SymbolRef(Sym, this);
836   return object_error::success;
837 }
838 
839 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
840                                               uint64_t &Res) const {
841   macho::RelocationEntry RE = getRelocation(Rel);
842   Res = getAnyRelocationType(RE);
843   return object_error::success;
844 }
845 
846 error_code
847 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
848                                        SmallVectorImpl<char> &Result) const {
849   StringRef res;
850   uint64_t RType;
851   getRelocationType(Rel, RType);
852 
853   unsigned Arch = this->getArch();
854 
855   switch (Arch) {
856     case Triple::x86: {
857       static const char *const Table[] =  {
858         "GENERIC_RELOC_VANILLA",
859         "GENERIC_RELOC_PAIR",
860         "GENERIC_RELOC_SECTDIFF",
861         "GENERIC_RELOC_PB_LA_PTR",
862         "GENERIC_RELOC_LOCAL_SECTDIFF",
863         "GENERIC_RELOC_TLV" };
864 
865       if (RType > 6)
866         res = "Unknown";
867       else
868         res = Table[RType];
869       break;
870     }
871     case Triple::x86_64: {
872       static const char *const Table[] =  {
873         "X86_64_RELOC_UNSIGNED",
874         "X86_64_RELOC_SIGNED",
875         "X86_64_RELOC_BRANCH",
876         "X86_64_RELOC_GOT_LOAD",
877         "X86_64_RELOC_GOT",
878         "X86_64_RELOC_SUBTRACTOR",
879         "X86_64_RELOC_SIGNED_1",
880         "X86_64_RELOC_SIGNED_2",
881         "X86_64_RELOC_SIGNED_4",
882         "X86_64_RELOC_TLV" };
883 
884       if (RType > 9)
885         res = "Unknown";
886       else
887         res = Table[RType];
888       break;
889     }
890     case Triple::arm: {
891       static const char *const Table[] =  {
892         "ARM_RELOC_VANILLA",
893         "ARM_RELOC_PAIR",
894         "ARM_RELOC_SECTDIFF",
895         "ARM_RELOC_LOCAL_SECTDIFF",
896         "ARM_RELOC_PB_LA_PTR",
897         "ARM_RELOC_BR24",
898         "ARM_THUMB_RELOC_BR22",
899         "ARM_THUMB_32BIT_BRANCH",
900         "ARM_RELOC_HALF",
901         "ARM_RELOC_HALF_SECTDIFF" };
902 
903       if (RType > 9)
904         res = "Unknown";
905       else
906         res = Table[RType];
907       break;
908     }
909     case Triple::ppc: {
910       static const char *const Table[] =  {
911         "PPC_RELOC_VANILLA",
912         "PPC_RELOC_PAIR",
913         "PPC_RELOC_BR14",
914         "PPC_RELOC_BR24",
915         "PPC_RELOC_HI16",
916         "PPC_RELOC_LO16",
917         "PPC_RELOC_HA16",
918         "PPC_RELOC_LO14",
919         "PPC_RELOC_SECTDIFF",
920         "PPC_RELOC_PB_LA_PTR",
921         "PPC_RELOC_HI16_SECTDIFF",
922         "PPC_RELOC_LO16_SECTDIFF",
923         "PPC_RELOC_HA16_SECTDIFF",
924         "PPC_RELOC_JBSR",
925         "PPC_RELOC_LO14_SECTDIFF",
926         "PPC_RELOC_LOCAL_SECTDIFF" };
927 
928       res = Table[RType];
929       break;
930     }
931     case Triple::UnknownArch:
932       res = "Unknown";
933       break;
934   }
935   Result.append(res.begin(), res.end());
936   return object_error::success;
937 }
938 
939 error_code MachOObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
940                                                         int64_t &Res) const {
941   Res = 0;
942   return object_error::success;
943 }
944 
945 error_code
946 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
947                                           SmallVectorImpl<char> &Result) const {
948   macho::RelocationEntry RE = getRelocation(Rel);
949 
950   unsigned Arch = this->getArch();
951 
952   std::string fmtbuf;
953   raw_string_ostream fmt(fmtbuf);
954   unsigned Type = this->getAnyRelocationType(RE);
955   bool IsPCRel = this->getAnyRelocationPCRel(RE);
956 
957   // Determine any addends that should be displayed with the relocation.
958   // These require decoding the relocation type, which is triple-specific.
959 
960   // X86_64 has entirely custom relocation types.
961   if (Arch == Triple::x86_64) {
962     bool isPCRel = getAnyRelocationPCRel(RE);
963 
964     switch (Type) {
965       case macho::RIT_X86_64_GOTLoad:   // X86_64_RELOC_GOT_LOAD
966       case macho::RIT_X86_64_GOT: {     // X86_64_RELOC_GOT
967         printRelocationTargetName(this, RE, fmt);
968         fmt << "@GOT";
969         if (isPCRel) fmt << "PCREL";
970         break;
971       }
972       case macho::RIT_X86_64_Subtractor: { // X86_64_RELOC_SUBTRACTOR
973         DataRefImpl RelNext = Rel;
974         RelNext.d.a++;
975         macho::RelocationEntry RENext = getRelocation(RelNext);
976 
977         // X86_64_SUBTRACTOR must be followed by a relocation of type
978         // X86_64_RELOC_UNSIGNED.
979         // NOTE: Scattered relocations don't exist on x86_64.
980         unsigned RType = getAnyRelocationType(RENext);
981         if (RType != 0)
982           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
983                              "X86_64_RELOC_SUBTRACTOR.");
984 
985         // The X86_64_RELOC_UNSIGNED contains the minuend symbol,
986         // X86_64_SUBTRACTOR contains to the subtrahend.
987         printRelocationTargetName(this, RENext, fmt);
988         fmt << "-";
989         printRelocationTargetName(this, RE, fmt);
990         break;
991       }
992       case macho::RIT_X86_64_TLV:
993         printRelocationTargetName(this, RE, fmt);
994         fmt << "@TLV";
995         if (isPCRel) fmt << "P";
996         break;
997       case macho::RIT_X86_64_Signed1: // X86_64_RELOC_SIGNED1
998         printRelocationTargetName(this, RE, fmt);
999         fmt << "-1";
1000         break;
1001       case macho::RIT_X86_64_Signed2: // X86_64_RELOC_SIGNED2
1002         printRelocationTargetName(this, RE, fmt);
1003         fmt << "-2";
1004         break;
1005       case macho::RIT_X86_64_Signed4: // X86_64_RELOC_SIGNED4
1006         printRelocationTargetName(this, RE, fmt);
1007         fmt << "-4";
1008         break;
1009       default:
1010         printRelocationTargetName(this, RE, fmt);
1011         break;
1012     }
1013   // X86 and ARM share some relocation types in common.
1014   } else if (Arch == Triple::x86 || Arch == Triple::arm) {
1015     // Generic relocation types...
1016     switch (Type) {
1017       case macho::RIT_Pair: // GENERIC_RELOC_PAIR - prints no info
1018         return object_error::success;
1019       case macho::RIT_Difference: { // GENERIC_RELOC_SECTDIFF
1020         DataRefImpl RelNext = Rel;
1021         RelNext.d.a++;
1022         macho::RelocationEntry RENext = getRelocation(RelNext);
1023 
1024         // X86 sect diff's must be followed by a relocation of type
1025         // GENERIC_RELOC_PAIR.
1026         unsigned RType = getAnyRelocationType(RENext);
1027 
1028         if (RType != 1)
1029           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1030                              "GENERIC_RELOC_SECTDIFF.");
1031 
1032         printRelocationTargetName(this, RE, fmt);
1033         fmt << "-";
1034         printRelocationTargetName(this, RENext, fmt);
1035         break;
1036       }
1037     }
1038 
1039     if (Arch == Triple::x86) {
1040       // All X86 relocations that need special printing were already
1041       // handled in the generic code.
1042       switch (Type) {
1043         case macho::RIT_Generic_LocalDifference:{// GENERIC_RELOC_LOCAL_SECTDIFF
1044           DataRefImpl RelNext = Rel;
1045           RelNext.d.a++;
1046           macho::RelocationEntry RENext = getRelocation(RelNext);
1047 
1048           // X86 sect diff's must be followed by a relocation of type
1049           // GENERIC_RELOC_PAIR.
1050           unsigned RType = getAnyRelocationType(RENext);
1051           if (RType != 1)
1052             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1053                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1054 
1055           printRelocationTargetName(this, RE, fmt);
1056           fmt << "-";
1057           printRelocationTargetName(this, RENext, fmt);
1058           break;
1059         }
1060         case macho::RIT_Generic_TLV: {
1061           printRelocationTargetName(this, RE, fmt);
1062           fmt << "@TLV";
1063           if (IsPCRel) fmt << "P";
1064           break;
1065         }
1066         default:
1067           printRelocationTargetName(this, RE, fmt);
1068       }
1069     } else { // ARM-specific relocations
1070       switch (Type) {
1071         case macho::RIT_ARM_Half:             // ARM_RELOC_HALF
1072         case macho::RIT_ARM_HalfDifference: { // ARM_RELOC_HALF_SECTDIFF
1073           // Half relocations steal a bit from the length field to encode
1074           // whether this is an upper16 or a lower16 relocation.
1075           bool isUpper = getAnyRelocationLength(RE) >> 1;
1076 
1077           if (isUpper)
1078             fmt << ":upper16:(";
1079           else
1080             fmt << ":lower16:(";
1081           printRelocationTargetName(this, RE, fmt);
1082 
1083           DataRefImpl RelNext = Rel;
1084           RelNext.d.a++;
1085           macho::RelocationEntry RENext = getRelocation(RelNext);
1086 
1087           // ARM half relocs must be followed by a relocation of type
1088           // ARM_RELOC_PAIR.
1089           unsigned RType = getAnyRelocationType(RENext);
1090           if (RType != 1)
1091             report_fatal_error("Expected ARM_RELOC_PAIR after "
1092                                "GENERIC_RELOC_HALF");
1093 
1094           // NOTE: The half of the target virtual address is stashed in the
1095           // address field of the secondary relocation, but we can't reverse
1096           // engineer the constant offset from it without decoding the movw/movt
1097           // instruction to find the other half in its immediate field.
1098 
1099           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1100           // symbol/section pointer of the follow-on relocation.
1101           if (Type == macho::RIT_ARM_HalfDifference) {
1102             fmt << "-";
1103             printRelocationTargetName(this, RENext, fmt);
1104           }
1105 
1106           fmt << ")";
1107           break;
1108         }
1109         default: {
1110           printRelocationTargetName(this, RE, fmt);
1111         }
1112       }
1113     }
1114   } else
1115     printRelocationTargetName(this, RE, fmt);
1116 
1117   fmt.flush();
1118   Result.append(fmtbuf.begin(), fmtbuf.end());
1119   return object_error::success;
1120 }
1121 
1122 error_code
1123 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1124   unsigned Arch = getArch();
1125   uint64_t Type;
1126   getRelocationType(Rel, Type);
1127 
1128   Result = false;
1129 
1130   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1131   // is always hidden.
1132   if (Arch == Triple::x86 || Arch == Triple::arm) {
1133     if (Type == macho::RIT_Pair) Result = true;
1134   } else if (Arch == Triple::x86_64) {
1135     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1136     // an X864_64_RELOC_SUBTRACTOR.
1137     if (Type == macho::RIT_X86_64_Unsigned && Rel.d.a > 0) {
1138       DataRefImpl RelPrev = Rel;
1139       RelPrev.d.a--;
1140       uint64_t PrevType;
1141       getRelocationType(RelPrev, PrevType);
1142       if (PrevType == macho::RIT_X86_64_Subtractor)
1143         Result = true;
1144     }
1145   }
1146 
1147   return object_error::success;
1148 }
1149 
1150 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1151                                            LibraryRef &Res) const {
1152   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1153 }
1154 
1155 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1156                                            StringRef &Res) const {
1157   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1158 }
1159 
1160 symbol_iterator MachOObjectFile::begin_symbols() const {
1161   DataRefImpl DRI;
1162   if (!SymtabLoadCmd)
1163     return symbol_iterator(SymbolRef(DRI, this));
1164 
1165   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1166   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.SymbolTableOffset));
1167   return symbol_iterator(SymbolRef(DRI, this));
1168 }
1169 
1170 symbol_iterator MachOObjectFile::end_symbols() const {
1171   DataRefImpl DRI;
1172   if (!SymtabLoadCmd)
1173     return symbol_iterator(SymbolRef(DRI, this));
1174 
1175   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1176   unsigned SymbolTableEntrySize = is64Bit() ?
1177     sizeof(macho::Symbol64TableEntry) :
1178     sizeof(macho::SymbolTableEntry);
1179   unsigned Offset = Symtab.SymbolTableOffset +
1180     Symtab.NumSymbolTableEntries * SymbolTableEntrySize;
1181   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1182   return symbol_iterator(SymbolRef(DRI, this));
1183 }
1184 
1185 symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
1186   // TODO: implement
1187   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1188 }
1189 
1190 symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
1191   // TODO: implement
1192   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1193 }
1194 
1195 section_iterator MachOObjectFile::begin_sections() const {
1196   DataRefImpl DRI;
1197   return section_iterator(SectionRef(DRI, this));
1198 }
1199 
1200 section_iterator MachOObjectFile::end_sections() const {
1201   DataRefImpl DRI;
1202   DRI.d.a = Sections.size();
1203   return section_iterator(SectionRef(DRI, this));
1204 }
1205 
1206 library_iterator MachOObjectFile::begin_libraries_needed() const {
1207   // TODO: implement
1208   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1209 }
1210 
1211 library_iterator MachOObjectFile::end_libraries_needed() const {
1212   // TODO: implement
1213   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1214 }
1215 
1216 uint8_t MachOObjectFile::getBytesInAddress() const {
1217   return is64Bit() ? 8 : 4;
1218 }
1219 
1220 StringRef MachOObjectFile::getFileFormatName() const {
1221   unsigned CPUType = getCPUType(this);
1222   if (!is64Bit()) {
1223     switch (CPUType) {
1224     case llvm::MachO::CPUTypeI386:
1225       return "Mach-O 32-bit i386";
1226     case llvm::MachO::CPUTypeARM:
1227       return "Mach-O arm";
1228     case llvm::MachO::CPUTypePowerPC:
1229       return "Mach-O 32-bit ppc";
1230     default:
1231       assert((CPUType & llvm::MachO::CPUArchABI64) == 0 &&
1232              "64-bit object file when we're not 64-bit?");
1233       return "Mach-O 32-bit unknown";
1234     }
1235   }
1236 
1237   // Make sure the cpu type has the correct mask.
1238   assert((CPUType & llvm::MachO::CPUArchABI64)
1239 	 == llvm::MachO::CPUArchABI64 &&
1240 	 "32-bit object file when we're 64-bit?");
1241 
1242   switch (CPUType) {
1243   case llvm::MachO::CPUTypeX86_64:
1244     return "Mach-O 64-bit x86-64";
1245   case llvm::MachO::CPUTypePowerPC64:
1246     return "Mach-O 64-bit ppc64";
1247   default:
1248     return "Mach-O 64-bit unknown";
1249   }
1250 }
1251 
1252 unsigned MachOObjectFile::getArch() const {
1253   switch (getCPUType(this)) {
1254   case llvm::MachO::CPUTypeI386:
1255     return Triple::x86;
1256   case llvm::MachO::CPUTypeX86_64:
1257     return Triple::x86_64;
1258   case llvm::MachO::CPUTypeARM:
1259     return Triple::arm;
1260   case llvm::MachO::CPUTypePowerPC:
1261     return Triple::ppc;
1262   case llvm::MachO::CPUTypePowerPC64:
1263     return Triple::ppc64;
1264   default:
1265     return Triple::UnknownArch;
1266   }
1267 }
1268 
1269 StringRef MachOObjectFile::getLoadName() const {
1270   // TODO: Implement
1271   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1272 }
1273 
1274 StringRef
1275 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1276   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1277   return parseSegmentOrSectionName(Raw.data());
1278 }
1279 
1280 ArrayRef<char>
1281 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1282   const SectionBase *Base =
1283     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1284   return ArrayRef<char>(Base->Name);
1285 }
1286 
1287 ArrayRef<char>
1288 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1289   const SectionBase *Base =
1290     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1291   return ArrayRef<char>(Base->SegmentName);
1292 }
1293 
1294 bool
1295 MachOObjectFile::isRelocationScattered(const macho::RelocationEntry &RE)
1296   const {
1297   if (getCPUType(this) == llvm::MachO::CPUTypeX86_64)
1298     return false;
1299   return getPlainRelocationAddress(RE) & macho::RF_Scattered;
1300 }
1301 
1302 unsigned MachOObjectFile::getPlainRelocationSymbolNum(const macho::RelocationEntry &RE) const {
1303   if (isLittleEndian())
1304     return RE.Word1 & 0xffffff;
1305   return RE.Word1 >> 8;
1306 }
1307 
1308 bool MachOObjectFile::getPlainRelocationExternal(const macho::RelocationEntry &RE) const {
1309   if (isLittleEndian())
1310     return (RE.Word1 >> 27) & 1;
1311   return (RE.Word1 >> 4) & 1;
1312 }
1313 
1314 bool
1315 MachOObjectFile::getScatteredRelocationScattered(const macho::RelocationEntry &RE) const {
1316   return RE.Word0 >> 31;
1317 }
1318 
1319 uint32_t
1320 MachOObjectFile::getScatteredRelocationValue(const macho::RelocationEntry &RE) const {
1321   return RE.Word1;
1322 }
1323 
1324 unsigned
1325 MachOObjectFile::getAnyRelocationAddress(const macho::RelocationEntry &RE) const {
1326   if (isRelocationScattered(RE))
1327     return getScatteredRelocationAddress(RE);
1328   return getPlainRelocationAddress(RE);
1329 }
1330 
1331 unsigned
1332 MachOObjectFile::getAnyRelocationPCRel(const macho::RelocationEntry &RE) const {
1333   if (isRelocationScattered(RE))
1334     return getScatteredRelocationPCRel(this, RE);
1335   return getPlainRelocationPCRel(this, RE);
1336 }
1337 
1338 unsigned
1339 MachOObjectFile::getAnyRelocationLength(const macho::RelocationEntry &RE) const {
1340   if (isRelocationScattered(RE))
1341     return getScatteredRelocationLength(RE);
1342   return getPlainRelocationLength(this, RE);
1343 }
1344 
1345 unsigned
1346 MachOObjectFile::getAnyRelocationType(const macho::RelocationEntry &RE) const {
1347   if (isRelocationScattered(RE))
1348     return getScatteredRelocationType(RE);
1349   return getPlainRelocationType(this, RE);
1350 }
1351 
1352 MachOObjectFile::LoadCommandInfo
1353 MachOObjectFile::getFirstLoadCommandInfo() const {
1354   MachOObjectFile::LoadCommandInfo Load;
1355 
1356   unsigned HeaderSize = is64Bit() ? macho::Header64Size : macho::Header32Size;
1357   Load.Ptr = getPtr(this, HeaderSize);
1358   Load.C = getStruct<macho::LoadCommand>(this, Load.Ptr);
1359   return Load;
1360 }
1361 
1362 MachOObjectFile::LoadCommandInfo
1363 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1364   MachOObjectFile::LoadCommandInfo Next;
1365   Next.Ptr = L.Ptr + L.C.Size;
1366   Next.C = getStruct<macho::LoadCommand>(this, Next.Ptr);
1367   return Next;
1368 }
1369 
1370 macho::Section MachOObjectFile::getSection(DataRefImpl DRI) const {
1371   return getStruct<macho::Section>(this, Sections[DRI.d.a]);
1372 }
1373 
1374 macho::Section64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1375   return getStruct<macho::Section64>(this, Sections[DRI.d.a]);
1376 }
1377 
1378 macho::SymbolTableEntry
1379 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1380   const char *P = reinterpret_cast<const char *>(DRI.p);
1381   return getStruct<macho::SymbolTableEntry>(this, P);
1382 }
1383 
1384 macho::Symbol64TableEntry
1385 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1386   const char *P = reinterpret_cast<const char *>(DRI.p);
1387   return getStruct<macho::Symbol64TableEntry>(this, P);
1388 }
1389 
1390 macho::LinkeditDataLoadCommand
1391 MachOObjectFile::getLinkeditDataLoadCommand(const MachOObjectFile::LoadCommandInfo &L) const {
1392   return getStruct<macho::LinkeditDataLoadCommand>(this, L.Ptr);
1393 }
1394 
1395 macho::RelocationEntry
1396 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1397   const char *P = reinterpret_cast<const char *>(Rel.p);
1398   return getStruct<macho::RelocationEntry>(this, P);
1399 }
1400 
1401 macho::Header MachOObjectFile::getHeader() const {
1402   return getStruct<macho::Header>(this, getPtr(this, 0));
1403 }
1404 
1405 macho::SymtabLoadCommand
1406 MachOObjectFile::getSymtabLoadCommand() const {
1407   return getStruct<macho::SymtabLoadCommand>(this, SymtabLoadCmd);
1408 }
1409 
1410 bool MachOObjectFile::is64Bit() const {
1411   return getType() == getMachOType(false, true) ||
1412     getType() == getMachOType(true, true);
1413 }
1414 
1415 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1416                                    SmallVectorImpl<uint64_t> &Out) const {
1417   DataExtractor extractor(ObjectFile::getData(), true, 0);
1418 
1419   uint32_t offset = Index;
1420   uint64_t data = 0;
1421   while (uint64_t delta = extractor.getULEB128(&offset)) {
1422     data += delta;
1423     Out.push_back(data);
1424   }
1425 }
1426 
1427 ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
1428   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1429   error_code ec;
1430   ObjectFile *Ret;
1431   if (Magic == "\xFE\xED\xFA\xCE")
1432     Ret = new MachOObjectFile(Buffer, false, false, ec);
1433   else if (Magic == "\xCE\xFA\xED\xFE")
1434     Ret = new MachOObjectFile(Buffer, true, false, ec);
1435   else if (Magic == "\xFE\xED\xFA\xCF")
1436     Ret = new MachOObjectFile(Buffer, false, true, ec);
1437   else if (Magic == "\xCF\xFA\xED\xFE")
1438     Ret = new MachOObjectFile(Buffer, true, true, ec);
1439   else
1440     return NULL;
1441 
1442   if (ec)
1443     return NULL;
1444   return Ret;
1445 }
1446 
1447 } // end namespace object
1448 } // end namespace llvm
1449