xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision b88cdf62f58db831aba26b6c94a8e6866a96a0b7) 
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::Header64Ext &E) {
124   SwapValue(E.Reserved);
125 }
126 
127 template<>
128 void 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 
137 template<>
138 void 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 
161 template<>
162 void SwapStruct(macho::LinkeditDataLoadCommand &C) {
163   SwapValue(C.Type);
164   SwapValue(C.Size);
165   SwapValue(C.DataOffset);
166   SwapValue(C.DataSize);
167 }
168 
169 template<>
170 void 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 
183 template<>
184 void 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 
197 template<>
198 void SwapStruct(macho::IndirectSymbolTableEntry &C) {
199   SwapValue(C.Index);
200 }
201 
202 template<>
203 void SwapStruct(macho::LinkerOptionsLoadCommand &C) {
204   SwapValue(C.Type);
205   SwapValue(C.Size);
206   SwapValue(C.Count);
207 }
208 
209 template<>
210 void SwapStruct(macho::DataInCodeTableEntry &C) {
211   SwapValue(C.Offset);
212   SwapValue(C.Length);
213   SwapValue(C.Kind);
214 }
215 
216 template<typename T>
217 T 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 
225 static uint32_t
226 getSegmentLoadCommandNumSections(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 
236 static const char *
237 getSectionPtr(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 
251 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
252   return O->getData().substr(Offset, 1).data();
253 }
254 
255 static SymbolTableEntryBase
256 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
257   const char *P = reinterpret_cast<const char *>(DRI.p);
258   return getStruct<SymbolTableEntryBase>(O, P);
259 }
260 
261 static 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.
270 template<class T>
271 static 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 
279 template<class T>
280 static void advanceTo(T &it, size_t Val) {
281   if (error_code ec = advance(it, Val))
282     report_fatal_error(ec.message());
283 }
284 
285 static unsigned getCPUType(const MachOObjectFile *O) {
286   return O->getHeader().CPUType;
287 }
288 
289 static 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->getPlainRelocationSymbolNum(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     // Adjust for the fact that sections are 1-indexed.
351     advanceTo(SI, Val - 1);
352     SI->getName(S);
353   }
354 
355   fmt << S;
356 }
357 
358 static uint32_t getPlainRelocationAddress(const macho::RelocationEntry &RE) {
359   return RE.Word0;
360 }
361 
362 static unsigned
363 getScatteredRelocationAddress(const macho::RelocationEntry &RE) {
364   return RE.Word0 & 0xffffff;
365 }
366 
367 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
368                                     const macho::RelocationEntry &RE) {
369   if (O->isLittleEndian())
370     return (RE.Word1 >> 24) & 1;
371   return (RE.Word1 >> 7) & 1;
372 }
373 
374 static bool
375 getScatteredRelocationPCRel(const MachOObjectFile *O,
376                             const macho::RelocationEntry &RE) {
377   return (RE.Word0 >> 30) & 1;
378 }
379 
380 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
381                                          const macho::RelocationEntry &RE) {
382   if (O->isLittleEndian())
383     return (RE.Word1 >> 25) & 3;
384   return (RE.Word1 >> 5) & 3;
385 }
386 
387 static unsigned
388 getScatteredRelocationLength(const macho::RelocationEntry &RE) {
389   return (RE.Word0 >> 28) & 3;
390 }
391 
392 static unsigned getPlainRelocationType(const MachOObjectFile *O,
393                                        const macho::RelocationEntry &RE) {
394   if (O->isLittleEndian())
395     return RE.Word1 >> 28;
396   return RE.Word1 & 0xf;
397 }
398 
399 static unsigned getScatteredRelocationType(const macho::RelocationEntry &RE) {
400   return (RE.Word0 >> 24) & 0xf;
401 }
402 
403 static uint32_t getSectionFlags(const MachOObjectFile *O,
404                                 DataRefImpl Sec) {
405   if (O->is64Bit()) {
406     macho::Section64 Sect = O->getSection64(Sec);
407     return Sect.Flags;
408   }
409   macho::Section Sect = O->getSection(Sec);
410   return Sect.Flags;
411 }
412 
413 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
414                                  bool IsLittleEndian, bool Is64bits,
415                                  error_code &ec)
416     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
417       SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
418   uint32_t LoadCommandCount = this->getHeader().NumLoadCommands;
419   macho::LoadCommandType SegmentLoadType = is64Bit() ?
420     macho::LCT_Segment64 : macho::LCT_Segment;
421 
422   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
423   for (unsigned I = 0; ; ++I) {
424     if (Load.C.Type == macho::LCT_Symtab) {
425       assert(!SymtabLoadCmd && "Multiple symbol tables");
426       SymtabLoadCmd = Load.Ptr;
427     } else if (Load.C.Type == macho::LCT_Dysymtab) {
428       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
429       DysymtabLoadCmd = Load.Ptr;
430     } else if (Load.C.Type == macho::LCT_DataInCode) {
431       assert(!DataInCodeLoadCmd && "Multiple data in code tables");
432       DataInCodeLoadCmd = Load.Ptr;
433     } else if (Load.C.Type == SegmentLoadType) {
434       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
435       for (unsigned J = 0; J < NumSections; ++J) {
436         const char *Sec = getSectionPtr(this, Load, J);
437         Sections.push_back(Sec);
438       }
439     }
440 
441     if (I == LoadCommandCount - 1)
442       break;
443     else
444       Load = getNextLoadCommandInfo(Load);
445   }
446 }
447 
448 error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
449                                           SymbolRef &Res) const {
450   unsigned SymbolTableEntrySize = is64Bit() ?
451     sizeof(macho::Symbol64TableEntry) :
452     sizeof(macho::SymbolTableEntry);
453   Symb.p += SymbolTableEntrySize;
454   Res = SymbolRef(Symb, this);
455   return object_error::success;
456 }
457 
458 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
459                                           StringRef &Res) const {
460   StringRef StringTable = getStringTableData();
461   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
462   const char *Start = &StringTable.data()[Entry.StringIndex];
463   Res = StringRef(Start);
464   return object_error::success;
465 }
466 
467 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
468                                              uint64_t &Res) const {
469   if (is64Bit()) {
470     macho::Symbol64TableEntry Entry = getSymbol64TableEntry(Symb);
471     Res = Entry.Value;
472   } else {
473     macho::SymbolTableEntry Entry = getSymbolTableEntry(Symb);
474     Res = Entry.Value;
475   }
476   return object_error::success;
477 }
478 
479 error_code
480 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
481                                      uint64_t &Res) const {
482   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
483   getSymbolAddress(Symb, Res);
484   if (Entry.SectionIndex) {
485     uint64_t Delta;
486     DataRefImpl SecRel;
487     SecRel.d.a = Entry.SectionIndex-1;
488     if (is64Bit()) {
489       macho::Section64 Sec = getSection64(SecRel);
490       Delta = Sec.Offset - Sec.Address;
491     } else {
492       macho::Section Sec = getSection(SecRel);
493       Delta = Sec.Offset - Sec.Address;
494     }
495 
496     Res += Delta;
497   }
498 
499   return object_error::success;
500 }
501 
502 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
503                                                uint32_t &Result) const {
504   uint32_t flags;
505   this->getSymbolFlags(DRI, flags);
506   if (flags & SymbolRef::SF_Common) {
507     SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
508     Result = 1 << MachO::GET_COMM_ALIGN(Entry.Flags);
509   } else {
510     Result = 0;
511   }
512   return object_error::success;
513 }
514 
515 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
516                                           uint64_t &Result) const {
517   uint64_t BeginOffset;
518   uint64_t EndOffset = 0;
519   uint8_t SectionIndex;
520 
521   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
522   uint64_t Value;
523   getSymbolAddress(DRI, Value);
524 
525   BeginOffset = Value;
526 
527   SectionIndex = Entry.SectionIndex;
528   if (!SectionIndex) {
529     uint32_t flags = SymbolRef::SF_None;
530     this->getSymbolFlags(DRI, flags);
531     if (flags & SymbolRef::SF_Common)
532       Result = Value;
533     else
534       Result = UnknownAddressOrSize;
535     return object_error::success;
536   }
537   // Unfortunately symbols are unsorted so we need to touch all
538   // symbols from load command
539   error_code ec;
540   for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E;
541        I.increment(ec)) {
542     DataRefImpl DRI = I->getRawDataRefImpl();
543     Entry = getSymbolTableEntryBase(this, DRI);
544     getSymbolAddress(DRI, Value);
545     if (Entry.SectionIndex == SectionIndex && Value > BeginOffset)
546       if (!EndOffset || Value < EndOffset)
547         EndOffset = Value;
548   }
549   if (!EndOffset) {
550     uint64_t Size;
551     DataRefImpl Sec;
552     Sec.d.a = SectionIndex-1;
553     getSectionSize(Sec, Size);
554     getSectionAddress(Sec, EndOffset);
555     EndOffset += Size;
556   }
557   Result = EndOffset - BeginOffset;
558   return object_error::success;
559 }
560 
561 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
562                                           SymbolRef::Type &Res) const {
563   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
564   uint8_t n_type = Entry.Type;
565 
566   Res = SymbolRef::ST_Other;
567 
568   // If this is a STAB debugging symbol, we can do nothing more.
569   if (n_type & MachO::NlistMaskStab) {
570     Res = SymbolRef::ST_Debug;
571     return object_error::success;
572   }
573 
574   switch (n_type & MachO::NlistMaskType) {
575     case MachO::NListTypeUndefined :
576       Res = SymbolRef::ST_Unknown;
577       break;
578     case MachO::NListTypeSection :
579       Res = SymbolRef::ST_Function;
580       break;
581   }
582   return object_error::success;
583 }
584 
585 error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
586                                                 char &Res) const {
587   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
588   uint8_t Type = Entry.Type;
589   uint16_t Flags = Entry.Flags;
590 
591   char Char;
592   switch (Type & macho::STF_TypeMask) {
593     case macho::STT_Undefined:
594       Char = 'u';
595       break;
596     case macho::STT_Absolute:
597     case macho::STT_Section:
598       Char = 's';
599       break;
600     default:
601       Char = '?';
602       break;
603   }
604 
605   if (Flags & (macho::STF_External | macho::STF_PrivateExtern))
606     Char = toupper(static_cast<unsigned char>(Char));
607   Res = Char;
608   return object_error::success;
609 }
610 
611 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
612                                            uint32_t &Result) const {
613   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
614 
615   uint8_t MachOType = Entry.Type;
616   uint16_t MachOFlags = Entry.Flags;
617 
618   // TODO: Correctly set SF_ThreadLocal
619   Result = SymbolRef::SF_None;
620 
621   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
622     Result |= SymbolRef::SF_Undefined;
623 
624   if (MachOFlags & macho::STF_StabsEntryMask)
625     Result |= SymbolRef::SF_FormatSpecific;
626 
627   if (MachOType & MachO::NlistMaskExternal) {
628     Result |= SymbolRef::SF_Global;
629     if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined) {
630       uint64_t Value;
631       getSymbolAddress(DRI, Value);
632       if (Value)
633         Result |= SymbolRef::SF_Common;
634     }
635   }
636 
637   if (MachOFlags & (MachO::NListDescWeakRef | MachO::NListDescWeakDef))
638     Result |= SymbolRef::SF_Weak;
639 
640   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeAbsolute)
641     Result |= SymbolRef::SF_Absolute;
642 
643   return object_error::success;
644 }
645 
646 error_code
647 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
648                                   section_iterator &Res) const {
649   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
650   uint8_t index = Entry.SectionIndex;
651 
652   if (index == 0) {
653     Res = end_sections();
654   } else {
655     DataRefImpl DRI;
656     DRI.d.a = index - 1;
657     Res = section_iterator(SectionRef(DRI, this));
658   }
659 
660   return object_error::success;
661 }
662 
663 error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
664                                            uint64_t &Val) const {
665   report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
666 }
667 
668 error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
669                                            SectionRef &Res) const {
670   Sec.d.a++;
671   Res = SectionRef(Sec, this);
672   return object_error::success;
673 }
674 
675 error_code
676 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
677   ArrayRef<char> Raw = getSectionRawName(Sec);
678   Result = parseSegmentOrSectionName(Raw.data());
679   return object_error::success;
680 }
681 
682 error_code
683 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
684   if (is64Bit()) {
685     macho::Section64 Sect = getSection64(Sec);
686     Res = Sect.Address;
687   } else {
688     macho::Section Sect = getSection(Sec);
689     Res = Sect.Address;
690   }
691   return object_error::success;
692 }
693 
694 error_code
695 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
696   if (is64Bit()) {
697     macho::Section64 Sect = getSection64(Sec);
698     Res = Sect.Size;
699   } else {
700     macho::Section Sect = getSection(Sec);
701     Res = Sect.Size;
702   }
703 
704   return object_error::success;
705 }
706 
707 error_code
708 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
709   uint32_t Offset;
710   uint64_t Size;
711 
712   if (is64Bit()) {
713     macho::Section64 Sect = getSection64(Sec);
714     Offset = Sect.Offset;
715     Size = Sect.Size;
716   } else {
717     macho::Section Sect =getSection(Sec);
718     Offset = Sect.Offset;
719     Size = Sect.Size;
720   }
721 
722   Res = this->getData().substr(Offset, Size);
723   return object_error::success;
724 }
725 
726 error_code
727 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
728   uint32_t Align;
729   if (is64Bit()) {
730     macho::Section64 Sect = getSection64(Sec);
731     Align = Sect.Align;
732   } else {
733     macho::Section Sect = getSection(Sec);
734     Align = Sect.Align;
735   }
736 
737   Res = uint64_t(1) << Align;
738   return object_error::success;
739 }
740 
741 error_code
742 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
743   uint32_t Flags = getSectionFlags(this, Sec);
744   Res = Flags & macho::SF_PureInstructions;
745   return object_error::success;
746 }
747 
748 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
749   // FIXME: Unimplemented.
750   Result = false;
751   return object_error::success;
752 }
753 
754 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
755   // FIXME: Unimplemented.
756   Result = false;
757   return object_error::success;
758 }
759 
760 error_code
761 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
762                                                bool &Result) const {
763   // FIXME: Unimplemented.
764   Result = true;
765   return object_error::success;
766 }
767 
768 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
769                                              bool &Result) const {
770   // FIXME: Unimplemented.
771   Result = false;
772   return object_error::success;
773 }
774 
775 error_code
776 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
777   uint32_t Flags = getSectionFlags(this, Sec);
778   unsigned SectionType = Flags & MachO::SectionFlagMaskSectionType;
779   Res = SectionType == MachO::SectionTypeZeroFill ||
780     SectionType == MachO::SectionTypeZeroFillLarge;
781   return object_error::success;
782 }
783 
784 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
785                                                   bool &Result) const {
786   // Consider using the code from isSectionText to look for __const sections.
787   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
788   // to use section attributes to distinguish code from data.
789 
790   // FIXME: Unimplemented.
791   Result = false;
792   return object_error::success;
793 }
794 
795 error_code
796 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
797                                        bool &Result) const {
798   SymbolRef::Type ST;
799   this->getSymbolType(Symb, ST);
800   if (ST == SymbolRef::ST_Unknown) {
801     Result = false;
802     return object_error::success;
803   }
804 
805   uint64_t SectBegin, SectEnd;
806   getSectionAddress(Sec, SectBegin);
807   getSectionSize(Sec, SectEnd);
808   SectEnd += SectBegin;
809 
810   uint64_t SymAddr;
811   getSymbolAddress(Symb, SymAddr);
812   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
813 
814   return object_error::success;
815 }
816 
817 relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
818   uint32_t Offset;
819   if (is64Bit()) {
820     macho::Section64 Sect = getSection64(Sec);
821     Offset = Sect.RelocationTableOffset;
822   } else {
823     macho::Section Sect = getSection(Sec);
824     Offset = Sect.RelocationTableOffset;
825   }
826 
827   DataRefImpl Ret;
828   Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
829   return relocation_iterator(RelocationRef(Ret, this));
830 }
831 
832 relocation_iterator
833 MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
834   uint32_t Offset;
835   uint32_t Num;
836   if (is64Bit()) {
837     macho::Section64 Sect = getSection64(Sec);
838     Offset = Sect.RelocationTableOffset;
839     Num = Sect.NumRelocationTableEntries;
840   } else {
841     macho::Section Sect = getSection(Sec);
842     Offset = Sect.RelocationTableOffset;
843     Num = Sect.NumRelocationTableEntries;
844   }
845 
846   const macho::RelocationEntry *P =
847     reinterpret_cast<const macho::RelocationEntry*>(getPtr(this, Offset));
848 
849   DataRefImpl Ret;
850   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
851   return relocation_iterator(RelocationRef(Ret, this));
852 }
853 
854 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
855                                               RelocationRef &Res) const {
856   const macho::RelocationEntry *P =
857     reinterpret_cast<const macho::RelocationEntry *>(Rel.p);
858   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
859   Res = RelocationRef(Rel, this);
860   return object_error::success;
861 }
862 
863 error_code
864 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
865   report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
866 }
867 
868 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
869                                                 uint64_t &Res) const {
870   macho::RelocationEntry RE = getRelocation(Rel);
871   Res = getAnyRelocationAddress(RE);
872   return object_error::success;
873 }
874 
875 symbol_iterator
876 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
877   macho::RelocationEntry RE = getRelocation(Rel);
878   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
879   bool isExtern = getPlainRelocationExternal(RE);
880   if (!isExtern)
881     return end_symbols();
882 
883   macho::SymtabLoadCommand S = getSymtabLoadCommand();
884   unsigned SymbolTableEntrySize = is64Bit() ?
885     sizeof(macho::Symbol64TableEntry) :
886     sizeof(macho::SymbolTableEntry);
887   uint64_t Offset = S.SymbolTableOffset + SymbolIdx * SymbolTableEntrySize;
888   DataRefImpl Sym;
889   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
890   return symbol_iterator(SymbolRef(Sym, this));
891 }
892 
893 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
894                                               uint64_t &Res) const {
895   macho::RelocationEntry RE = getRelocation(Rel);
896   Res = getAnyRelocationType(RE);
897   return object_error::success;
898 }
899 
900 error_code
901 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
902                                        SmallVectorImpl<char> &Result) const {
903   StringRef res;
904   uint64_t RType;
905   getRelocationType(Rel, RType);
906 
907   unsigned Arch = this->getArch();
908 
909   switch (Arch) {
910     case Triple::x86: {
911       static const char *const Table[] =  {
912         "GENERIC_RELOC_VANILLA",
913         "GENERIC_RELOC_PAIR",
914         "GENERIC_RELOC_SECTDIFF",
915         "GENERIC_RELOC_PB_LA_PTR",
916         "GENERIC_RELOC_LOCAL_SECTDIFF",
917         "GENERIC_RELOC_TLV" };
918 
919       if (RType > 6)
920         res = "Unknown";
921       else
922         res = Table[RType];
923       break;
924     }
925     case Triple::x86_64: {
926       static const char *const Table[] =  {
927         "X86_64_RELOC_UNSIGNED",
928         "X86_64_RELOC_SIGNED",
929         "X86_64_RELOC_BRANCH",
930         "X86_64_RELOC_GOT_LOAD",
931         "X86_64_RELOC_GOT",
932         "X86_64_RELOC_SUBTRACTOR",
933         "X86_64_RELOC_SIGNED_1",
934         "X86_64_RELOC_SIGNED_2",
935         "X86_64_RELOC_SIGNED_4",
936         "X86_64_RELOC_TLV" };
937 
938       if (RType > 9)
939         res = "Unknown";
940       else
941         res = Table[RType];
942       break;
943     }
944     case Triple::arm: {
945       static const char *const Table[] =  {
946         "ARM_RELOC_VANILLA",
947         "ARM_RELOC_PAIR",
948         "ARM_RELOC_SECTDIFF",
949         "ARM_RELOC_LOCAL_SECTDIFF",
950         "ARM_RELOC_PB_LA_PTR",
951         "ARM_RELOC_BR24",
952         "ARM_THUMB_RELOC_BR22",
953         "ARM_THUMB_32BIT_BRANCH",
954         "ARM_RELOC_HALF",
955         "ARM_RELOC_HALF_SECTDIFF" };
956 
957       if (RType > 9)
958         res = "Unknown";
959       else
960         res = Table[RType];
961       break;
962     }
963     case Triple::ppc: {
964       static const char *const Table[] =  {
965         "PPC_RELOC_VANILLA",
966         "PPC_RELOC_PAIR",
967         "PPC_RELOC_BR14",
968         "PPC_RELOC_BR24",
969         "PPC_RELOC_HI16",
970         "PPC_RELOC_LO16",
971         "PPC_RELOC_HA16",
972         "PPC_RELOC_LO14",
973         "PPC_RELOC_SECTDIFF",
974         "PPC_RELOC_PB_LA_PTR",
975         "PPC_RELOC_HI16_SECTDIFF",
976         "PPC_RELOC_LO16_SECTDIFF",
977         "PPC_RELOC_HA16_SECTDIFF",
978         "PPC_RELOC_JBSR",
979         "PPC_RELOC_LO14_SECTDIFF",
980         "PPC_RELOC_LOCAL_SECTDIFF" };
981 
982       res = Table[RType];
983       break;
984     }
985     case Triple::UnknownArch:
986       res = "Unknown";
987       break;
988   }
989   Result.append(res.begin(), res.end());
990   return object_error::success;
991 }
992 
993 error_code
994 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
995                                           SmallVectorImpl<char> &Result) const {
996   macho::RelocationEntry RE = getRelocation(Rel);
997 
998   unsigned Arch = this->getArch();
999 
1000   std::string fmtbuf;
1001   raw_string_ostream fmt(fmtbuf);
1002   unsigned Type = this->getAnyRelocationType(RE);
1003   bool IsPCRel = this->getAnyRelocationPCRel(RE);
1004 
1005   // Determine any addends that should be displayed with the relocation.
1006   // These require decoding the relocation type, which is triple-specific.
1007 
1008   // X86_64 has entirely custom relocation types.
1009   if (Arch == Triple::x86_64) {
1010     bool isPCRel = getAnyRelocationPCRel(RE);
1011 
1012     switch (Type) {
1013       case macho::RIT_X86_64_GOTLoad:   // X86_64_RELOC_GOT_LOAD
1014       case macho::RIT_X86_64_GOT: {     // X86_64_RELOC_GOT
1015         printRelocationTargetName(this, RE, fmt);
1016         fmt << "@GOT";
1017         if (isPCRel) fmt << "PCREL";
1018         break;
1019       }
1020       case macho::RIT_X86_64_Subtractor: { // X86_64_RELOC_SUBTRACTOR
1021         DataRefImpl RelNext = Rel;
1022         RelNext.d.a++;
1023         macho::RelocationEntry RENext = getRelocation(RelNext);
1024 
1025         // X86_64_SUBTRACTOR must be followed by a relocation of type
1026         // X86_64_RELOC_UNSIGNED.
1027         // NOTE: Scattered relocations don't exist on x86_64.
1028         unsigned RType = getAnyRelocationType(RENext);
1029         if (RType != 0)
1030           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1031                              "X86_64_RELOC_SUBTRACTOR.");
1032 
1033         // The X86_64_RELOC_UNSIGNED contains the minuend symbol,
1034         // X86_64_SUBTRACTOR contains to the subtrahend.
1035         printRelocationTargetName(this, RENext, fmt);
1036         fmt << "-";
1037         printRelocationTargetName(this, RE, fmt);
1038         break;
1039       }
1040       case macho::RIT_X86_64_TLV:
1041         printRelocationTargetName(this, RE, fmt);
1042         fmt << "@TLV";
1043         if (isPCRel) fmt << "P";
1044         break;
1045       case macho::RIT_X86_64_Signed1: // X86_64_RELOC_SIGNED1
1046         printRelocationTargetName(this, RE, fmt);
1047         fmt << "-1";
1048         break;
1049       case macho::RIT_X86_64_Signed2: // X86_64_RELOC_SIGNED2
1050         printRelocationTargetName(this, RE, fmt);
1051         fmt << "-2";
1052         break;
1053       case macho::RIT_X86_64_Signed4: // X86_64_RELOC_SIGNED4
1054         printRelocationTargetName(this, RE, fmt);
1055         fmt << "-4";
1056         break;
1057       default:
1058         printRelocationTargetName(this, RE, fmt);
1059         break;
1060     }
1061   // X86 and ARM share some relocation types in common.
1062   } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1063              Arch == Triple::ppc) {
1064     // Generic relocation types...
1065     switch (Type) {
1066       case macho::RIT_Pair: // GENERIC_RELOC_PAIR - prints no info
1067         return object_error::success;
1068       case macho::RIT_Difference: { // GENERIC_RELOC_SECTDIFF
1069         DataRefImpl RelNext = Rel;
1070         RelNext.d.a++;
1071         macho::RelocationEntry RENext = getRelocation(RelNext);
1072 
1073         // X86 sect diff's must be followed by a relocation of type
1074         // GENERIC_RELOC_PAIR.
1075         unsigned RType = getAnyRelocationType(RENext);
1076 
1077         if (RType != 1)
1078           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1079                              "GENERIC_RELOC_SECTDIFF.");
1080 
1081         printRelocationTargetName(this, RE, fmt);
1082         fmt << "-";
1083         printRelocationTargetName(this, RENext, fmt);
1084         break;
1085       }
1086     }
1087 
1088     if (Arch == Triple::x86 || Arch == Triple::ppc) {
1089       // All X86 relocations that need special printing were already
1090       // handled in the generic code.
1091       switch (Type) {
1092         case macho::RIT_Generic_LocalDifference:{// GENERIC_RELOC_LOCAL_SECTDIFF
1093           DataRefImpl RelNext = Rel;
1094           RelNext.d.a++;
1095           macho::RelocationEntry RENext = getRelocation(RelNext);
1096 
1097           // X86 sect diff's must be followed by a relocation of type
1098           // GENERIC_RELOC_PAIR.
1099           unsigned RType = getAnyRelocationType(RENext);
1100           if (RType != 1)
1101             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1102                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1103 
1104           printRelocationTargetName(this, RE, fmt);
1105           fmt << "-";
1106           printRelocationTargetName(this, RENext, fmt);
1107           break;
1108         }
1109         case macho::RIT_Generic_TLV: {
1110           printRelocationTargetName(this, RE, fmt);
1111           fmt << "@TLV";
1112           if (IsPCRel) fmt << "P";
1113           break;
1114         }
1115         default:
1116           printRelocationTargetName(this, RE, fmt);
1117       }
1118     } else { // ARM-specific relocations
1119       switch (Type) {
1120         case macho::RIT_ARM_Half:             // ARM_RELOC_HALF
1121         case macho::RIT_ARM_HalfDifference: { // ARM_RELOC_HALF_SECTDIFF
1122           // Half relocations steal a bit from the length field to encode
1123           // whether this is an upper16 or a lower16 relocation.
1124           bool isUpper = getAnyRelocationLength(RE) >> 1;
1125 
1126           if (isUpper)
1127             fmt << ":upper16:(";
1128           else
1129             fmt << ":lower16:(";
1130           printRelocationTargetName(this, RE, fmt);
1131 
1132           DataRefImpl RelNext = Rel;
1133           RelNext.d.a++;
1134           macho::RelocationEntry RENext = getRelocation(RelNext);
1135 
1136           // ARM half relocs must be followed by a relocation of type
1137           // ARM_RELOC_PAIR.
1138           unsigned RType = getAnyRelocationType(RENext);
1139           if (RType != 1)
1140             report_fatal_error("Expected ARM_RELOC_PAIR after "
1141                                "GENERIC_RELOC_HALF");
1142 
1143           // NOTE: The half of the target virtual address is stashed in the
1144           // address field of the secondary relocation, but we can't reverse
1145           // engineer the constant offset from it without decoding the movw/movt
1146           // instruction to find the other half in its immediate field.
1147 
1148           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1149           // symbol/section pointer of the follow-on relocation.
1150           if (Type == macho::RIT_ARM_HalfDifference) {
1151             fmt << "-";
1152             printRelocationTargetName(this, RENext, fmt);
1153           }
1154 
1155           fmt << ")";
1156           break;
1157         }
1158         default: {
1159           printRelocationTargetName(this, RE, fmt);
1160         }
1161       }
1162     }
1163   } else
1164     printRelocationTargetName(this, RE, fmt);
1165 
1166   fmt.flush();
1167   Result.append(fmtbuf.begin(), fmtbuf.end());
1168   return object_error::success;
1169 }
1170 
1171 error_code
1172 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1173   unsigned Arch = getArch();
1174   uint64_t Type;
1175   getRelocationType(Rel, Type);
1176 
1177   Result = false;
1178 
1179   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1180   // is always hidden.
1181   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1182     if (Type == macho::RIT_Pair) Result = true;
1183   } else if (Arch == Triple::x86_64) {
1184     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1185     // an X86_64_RELOC_SUBTRACTOR.
1186     if (Type == macho::RIT_X86_64_Unsigned && Rel.d.a > 0) {
1187       DataRefImpl RelPrev = Rel;
1188       RelPrev.d.a--;
1189       uint64_t PrevType;
1190       getRelocationType(RelPrev, PrevType);
1191       if (PrevType == macho::RIT_X86_64_Subtractor)
1192         Result = true;
1193     }
1194   }
1195 
1196   return object_error::success;
1197 }
1198 
1199 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1200                                            LibraryRef &Res) const {
1201   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1202 }
1203 
1204 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1205                                            StringRef &Res) const {
1206   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1207 }
1208 
1209 symbol_iterator MachOObjectFile::begin_symbols() const {
1210   DataRefImpl DRI;
1211   if (!SymtabLoadCmd)
1212     return symbol_iterator(SymbolRef(DRI, this));
1213 
1214   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1215   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.SymbolTableOffset));
1216   return symbol_iterator(SymbolRef(DRI, this));
1217 }
1218 
1219 symbol_iterator MachOObjectFile::end_symbols() const {
1220   DataRefImpl DRI;
1221   if (!SymtabLoadCmd)
1222     return symbol_iterator(SymbolRef(DRI, this));
1223 
1224   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1225   unsigned SymbolTableEntrySize = is64Bit() ?
1226     sizeof(macho::Symbol64TableEntry) :
1227     sizeof(macho::SymbolTableEntry);
1228   unsigned Offset = Symtab.SymbolTableOffset +
1229     Symtab.NumSymbolTableEntries * SymbolTableEntrySize;
1230   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1231   return symbol_iterator(SymbolRef(DRI, this));
1232 }
1233 
1234 symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
1235   // TODO: implement
1236   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1237 }
1238 
1239 symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
1240   // TODO: implement
1241   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1242 }
1243 
1244 section_iterator MachOObjectFile::begin_sections() const {
1245   DataRefImpl DRI;
1246   return section_iterator(SectionRef(DRI, this));
1247 }
1248 
1249 section_iterator MachOObjectFile::end_sections() const {
1250   DataRefImpl DRI;
1251   DRI.d.a = Sections.size();
1252   return section_iterator(SectionRef(DRI, this));
1253 }
1254 
1255 library_iterator MachOObjectFile::begin_libraries_needed() const {
1256   // TODO: implement
1257   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1258 }
1259 
1260 library_iterator MachOObjectFile::end_libraries_needed() const {
1261   // TODO: implement
1262   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1263 }
1264 
1265 uint8_t MachOObjectFile::getBytesInAddress() const {
1266   return is64Bit() ? 8 : 4;
1267 }
1268 
1269 StringRef MachOObjectFile::getFileFormatName() const {
1270   unsigned CPUType = getCPUType(this);
1271   if (!is64Bit()) {
1272     switch (CPUType) {
1273     case llvm::MachO::CPUTypeI386:
1274       return "Mach-O 32-bit i386";
1275     case llvm::MachO::CPUTypeARM:
1276       return "Mach-O arm";
1277     case llvm::MachO::CPUTypePowerPC:
1278       return "Mach-O 32-bit ppc";
1279     default:
1280       assert((CPUType & llvm::MachO::CPUArchABI64) == 0 &&
1281              "64-bit object file when we're not 64-bit?");
1282       return "Mach-O 32-bit unknown";
1283     }
1284   }
1285 
1286   // Make sure the cpu type has the correct mask.
1287   assert((CPUType & llvm::MachO::CPUArchABI64)
1288          == llvm::MachO::CPUArchABI64 &&
1289          "32-bit object file when we're 64-bit?");
1290 
1291   switch (CPUType) {
1292   case llvm::MachO::CPUTypeX86_64:
1293     return "Mach-O 64-bit x86-64";
1294   case llvm::MachO::CPUTypePowerPC64:
1295     return "Mach-O 64-bit ppc64";
1296   default:
1297     return "Mach-O 64-bit unknown";
1298   }
1299 }
1300 
1301 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1302   switch (CPUType) {
1303   case llvm::MachO::CPUTypeI386:
1304     return Triple::x86;
1305   case llvm::MachO::CPUTypeX86_64:
1306     return Triple::x86_64;
1307   case llvm::MachO::CPUTypeARM:
1308     return Triple::arm;
1309   case llvm::MachO::CPUTypePowerPC:
1310     return Triple::ppc;
1311   case llvm::MachO::CPUTypePowerPC64:
1312     return Triple::ppc64;
1313   default:
1314     return Triple::UnknownArch;
1315   }
1316 }
1317 
1318 unsigned MachOObjectFile::getArch() const {
1319   return getArch(getCPUType(this));
1320 }
1321 
1322 StringRef MachOObjectFile::getLoadName() const {
1323   // TODO: Implement
1324   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1325 }
1326 
1327 relocation_iterator MachOObjectFile::getSectionRelBegin(unsigned Index) const {
1328   DataRefImpl DRI;
1329   DRI.d.a = Index;
1330   return getSectionRelBegin(DRI);
1331 }
1332 
1333 relocation_iterator MachOObjectFile::getSectionRelEnd(unsigned Index) const {
1334   DataRefImpl DRI;
1335   DRI.d.a = Index;
1336   return getSectionRelEnd(DRI);
1337 }
1338 
1339 dice_iterator MachOObjectFile::begin_dices() const {
1340   DataRefImpl DRI;
1341   if (!DataInCodeLoadCmd)
1342     return dice_iterator(DiceRef(DRI, this));
1343 
1344   macho::LinkeditDataLoadCommand DicLC = getDataInCodeLoadCommand();
1345   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.DataOffset));
1346   return dice_iterator(DiceRef(DRI, this));
1347 }
1348 
1349 dice_iterator MachOObjectFile::end_dices() const {
1350   DataRefImpl DRI;
1351   if (!DataInCodeLoadCmd)
1352     return dice_iterator(DiceRef(DRI, this));
1353 
1354   macho::LinkeditDataLoadCommand DicLC = getDataInCodeLoadCommand();
1355   unsigned Offset = DicLC.DataOffset + DicLC.DataSize;
1356   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1357   return dice_iterator(DiceRef(DRI, this));
1358 }
1359 
1360 StringRef
1361 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1362   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1363   return parseSegmentOrSectionName(Raw.data());
1364 }
1365 
1366 ArrayRef<char>
1367 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1368   const SectionBase *Base =
1369     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1370   return ArrayRef<char>(Base->Name);
1371 }
1372 
1373 ArrayRef<char>
1374 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1375   const SectionBase *Base =
1376     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1377   return ArrayRef<char>(Base->SegmentName);
1378 }
1379 
1380 bool
1381 MachOObjectFile::isRelocationScattered(const macho::RelocationEntry &RE)
1382   const {
1383   if (getCPUType(this) == llvm::MachO::CPUTypeX86_64)
1384     return false;
1385   return getPlainRelocationAddress(RE) & macho::RF_Scattered;
1386 }
1387 
1388 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1389     const macho::RelocationEntry &RE) const {
1390   if (isLittleEndian())
1391     return RE.Word1 & 0xffffff;
1392   return RE.Word1 >> 8;
1393 }
1394 
1395 bool MachOObjectFile::getPlainRelocationExternal(
1396     const macho::RelocationEntry &RE) const {
1397   if (isLittleEndian())
1398     return (RE.Word1 >> 27) & 1;
1399   return (RE.Word1 >> 4) & 1;
1400 }
1401 
1402 bool MachOObjectFile::getScatteredRelocationScattered(
1403     const macho::RelocationEntry &RE) const {
1404   return RE.Word0 >> 31;
1405 }
1406 
1407 uint32_t MachOObjectFile::getScatteredRelocationValue(
1408     const macho::RelocationEntry &RE) const {
1409   return RE.Word1;
1410 }
1411 
1412 unsigned MachOObjectFile::getAnyRelocationAddress(
1413     const macho::RelocationEntry &RE) const {
1414   if (isRelocationScattered(RE))
1415     return getScatteredRelocationAddress(RE);
1416   return getPlainRelocationAddress(RE);
1417 }
1418 
1419 unsigned
1420 MachOObjectFile::getAnyRelocationPCRel(const macho::RelocationEntry &RE) const {
1421   if (isRelocationScattered(RE))
1422     return getScatteredRelocationPCRel(this, RE);
1423   return getPlainRelocationPCRel(this, RE);
1424 }
1425 
1426 unsigned MachOObjectFile::getAnyRelocationLength(
1427     const macho::RelocationEntry &RE) const {
1428   if (isRelocationScattered(RE))
1429     return getScatteredRelocationLength(RE);
1430   return getPlainRelocationLength(this, RE);
1431 }
1432 
1433 unsigned
1434 MachOObjectFile::getAnyRelocationType(const macho::RelocationEntry &RE) const {
1435   if (isRelocationScattered(RE))
1436     return getScatteredRelocationType(RE);
1437   return getPlainRelocationType(this, RE);
1438 }
1439 
1440 SectionRef
1441 MachOObjectFile::getRelocationSection(const macho::RelocationEntry &RE) const {
1442   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1443     return *end_sections();
1444   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1445   DataRefImpl DRI;
1446   DRI.d.a = SecNum;
1447   return SectionRef(DRI, this);
1448 }
1449 
1450 MachOObjectFile::LoadCommandInfo
1451 MachOObjectFile::getFirstLoadCommandInfo() const {
1452   MachOObjectFile::LoadCommandInfo Load;
1453 
1454   unsigned HeaderSize = is64Bit() ? macho::Header64Size : macho::Header32Size;
1455   Load.Ptr = getPtr(this, HeaderSize);
1456   Load.C = getStruct<macho::LoadCommand>(this, Load.Ptr);
1457   return Load;
1458 }
1459 
1460 MachOObjectFile::LoadCommandInfo
1461 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1462   MachOObjectFile::LoadCommandInfo Next;
1463   Next.Ptr = L.Ptr + L.C.Size;
1464   Next.C = getStruct<macho::LoadCommand>(this, Next.Ptr);
1465   return Next;
1466 }
1467 
1468 macho::Section MachOObjectFile::getSection(DataRefImpl DRI) const {
1469   return getStruct<macho::Section>(this, Sections[DRI.d.a]);
1470 }
1471 
1472 macho::Section64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1473   return getStruct<macho::Section64>(this, Sections[DRI.d.a]);
1474 }
1475 
1476 macho::Section MachOObjectFile::getSection(const LoadCommandInfo &L,
1477                                            unsigned Index) const {
1478   const char *Sec = getSectionPtr(this, L, Index);
1479   return getStruct<macho::Section>(this, Sec);
1480 }
1481 
1482 macho::Section64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1483                                                unsigned Index) const {
1484   const char *Sec = getSectionPtr(this, L, Index);
1485   return getStruct<macho::Section64>(this, Sec);
1486 }
1487 
1488 macho::SymbolTableEntry
1489 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1490   const char *P = reinterpret_cast<const char *>(DRI.p);
1491   return getStruct<macho::SymbolTableEntry>(this, P);
1492 }
1493 
1494 macho::Symbol64TableEntry
1495 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1496   const char *P = reinterpret_cast<const char *>(DRI.p);
1497   return getStruct<macho::Symbol64TableEntry>(this, P);
1498 }
1499 
1500 macho::LinkeditDataLoadCommand MachOObjectFile::getLinkeditDataLoadCommand(
1501     const MachOObjectFile::LoadCommandInfo &L) const {
1502   return getStruct<macho::LinkeditDataLoadCommand>(this, L.Ptr);
1503 }
1504 
1505 macho::SegmentLoadCommand
1506 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1507   return getStruct<macho::SegmentLoadCommand>(this, L.Ptr);
1508 }
1509 
1510 macho::Segment64LoadCommand
1511 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1512   return getStruct<macho::Segment64LoadCommand>(this, L.Ptr);
1513 }
1514 
1515 macho::LinkerOptionsLoadCommand
1516 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1517   return getStruct<macho::LinkerOptionsLoadCommand>(this, L.Ptr);
1518 }
1519 
1520 macho::RelocationEntry
1521 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1522   const char *P = reinterpret_cast<const char *>(Rel.p);
1523   return getStruct<macho::RelocationEntry>(this, P);
1524 }
1525 
1526 macho::DataInCodeTableEntry
1527 MachOObjectFile::getDice(DataRefImpl Rel) const {
1528   const char *P = reinterpret_cast<const char *>(Rel.p);
1529   return getStruct<macho::DataInCodeTableEntry>(this, P);
1530 }
1531 
1532 macho::Header MachOObjectFile::getHeader() const {
1533   return getStruct<macho::Header>(this, getPtr(this, 0));
1534 }
1535 
1536 macho::Header64Ext MachOObjectFile::getHeader64Ext() const {
1537   return
1538     getStruct<macho::Header64Ext>(this, getPtr(this, sizeof(macho::Header)));
1539 }
1540 
1541 macho::IndirectSymbolTableEntry MachOObjectFile::getIndirectSymbolTableEntry(
1542                                           const macho::DysymtabLoadCommand &DLC,
1543                                           unsigned Index) const {
1544   uint64_t Offset = DLC.IndirectSymbolTableOffset +
1545     Index * sizeof(macho::IndirectSymbolTableEntry);
1546   return getStruct<macho::IndirectSymbolTableEntry>(this, getPtr(this, Offset));
1547 }
1548 
1549 macho::DataInCodeTableEntry
1550 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1551                                          unsigned Index) const {
1552   uint64_t Offset = DataOffset + Index * sizeof(macho::DataInCodeTableEntry);
1553   return getStruct<macho::DataInCodeTableEntry>(this, getPtr(this, Offset));
1554 }
1555 
1556 macho::SymtabLoadCommand MachOObjectFile::getSymtabLoadCommand() const {
1557   return getStruct<macho::SymtabLoadCommand>(this, SymtabLoadCmd);
1558 }
1559 
1560 macho::DysymtabLoadCommand MachOObjectFile::getDysymtabLoadCommand() const {
1561   return getStruct<macho::DysymtabLoadCommand>(this, DysymtabLoadCmd);
1562 }
1563 
1564 macho::LinkeditDataLoadCommand
1565 MachOObjectFile::getDataInCodeLoadCommand() const {
1566   if (DataInCodeLoadCmd)
1567     return getStruct<macho::LinkeditDataLoadCommand>(this, DataInCodeLoadCmd);
1568 
1569   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1570   macho::LinkeditDataLoadCommand Cmd;
1571   Cmd.Type = macho::LCT_DataInCode;
1572   Cmd.Size = macho::LinkeditLoadCommandSize;
1573   Cmd.DataOffset = 0;
1574   Cmd.DataSize = 0;
1575   return Cmd;
1576 }
1577 
1578 StringRef MachOObjectFile::getStringTableData() const {
1579   macho::SymtabLoadCommand S = getSymtabLoadCommand();
1580   return getData().substr(S.StringTableOffset, S.StringTableSize);
1581 }
1582 
1583 bool MachOObjectFile::is64Bit() const {
1584   return getType() == getMachOType(false, true) ||
1585     getType() == getMachOType(true, true);
1586 }
1587 
1588 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1589                                    SmallVectorImpl<uint64_t> &Out) const {
1590   DataExtractor extractor(ObjectFile::getData(), true, 0);
1591 
1592   uint32_t offset = Index;
1593   uint64_t data = 0;
1594   while (uint64_t delta = extractor.getULEB128(&offset)) {
1595     data += delta;
1596     Out.push_back(data);
1597   }
1598 }
1599 
1600 ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
1601   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1602   error_code ec;
1603   OwningPtr<ObjectFile> Ret;
1604   if (Magic == "\xFE\xED\xFA\xCE")
1605     Ret.reset(new MachOObjectFile(Buffer, false, false, ec));
1606   else if (Magic == "\xCE\xFA\xED\xFE")
1607     Ret.reset(new MachOObjectFile(Buffer, true, false, ec));
1608   else if (Magic == "\xFE\xED\xFA\xCF")
1609     Ret.reset(new MachOObjectFile(Buffer, false, true, ec));
1610   else if (Magic == "\xCF\xFA\xED\xFE")
1611     Ret.reset(new MachOObjectFile(Buffer, true, true, ec));
1612   else {
1613     delete Buffer;
1614     return NULL;
1615   }
1616 
1617   if (ec)
1618     return NULL;
1619   return Ret.take();
1620 }
1621 
1622 } // end namespace object
1623 } // end namespace llvm
1624