xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 52501033d0935fd221c7278ccee478192a435d8d) 
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->getAnyRelocationAddress(RE);
343 
344   if (isExtern) {
345     symbol_iterator SI = O->begin_symbols();
346     advanceTo(SI, Val);
347     SI->getName(S);
348   } else {
349     section_iterator SI = O->begin_sections();
350     advanceTo(SI, Val);
351     SI->getName(S);
352   }
353 
354   fmt << S;
355 }
356 
357 static uint32_t getPlainRelocationAddress(const macho::RelocationEntry &RE) {
358   return RE.Word0;
359 }
360 
361 static unsigned
362 getScatteredRelocationAddress(const macho::RelocationEntry &RE) {
363   return RE.Word0 & 0xffffff;
364 }
365 
366 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
367                                     const macho::RelocationEntry &RE) {
368   if (O->isLittleEndian())
369     return (RE.Word1 >> 24) & 1;
370   return (RE.Word1 >> 7) & 1;
371 }
372 
373 static bool
374 getScatteredRelocationPCRel(const MachOObjectFile *O,
375                             const macho::RelocationEntry &RE) {
376   return (RE.Word0 >> 30) & 1;
377 }
378 
379 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
380                                          const macho::RelocationEntry &RE) {
381   if (O->isLittleEndian())
382     return (RE.Word1 >> 25) & 3;
383   return (RE.Word1 >> 5) & 3;
384 }
385 
386 static unsigned
387 getScatteredRelocationLength(const macho::RelocationEntry &RE) {
388   return (RE.Word0 >> 28) & 3;
389 }
390 
391 static unsigned getPlainRelocationType(const MachOObjectFile *O,
392                                        const macho::RelocationEntry &RE) {
393   if (O->isLittleEndian())
394     return RE.Word1 >> 28;
395   return RE.Word1 & 0xf;
396 }
397 
398 static unsigned getScatteredRelocationType(const macho::RelocationEntry &RE) {
399   return (RE.Word0 >> 24) & 0xf;
400 }
401 
402 static uint32_t getSectionFlags(const MachOObjectFile *O,
403                                 DataRefImpl Sec) {
404   if (O->is64Bit()) {
405     macho::Section64 Sect = O->getSection64(Sec);
406     return Sect.Flags;
407   }
408   macho::Section Sect = O->getSection(Sec);
409   return Sect.Flags;
410 }
411 
412 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
413                                  bool IsLittleEndian, bool Is64bits,
414                                  error_code &ec)
415     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
416       SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL) {
417   uint32_t LoadCommandCount = this->getHeader().NumLoadCommands;
418   macho::LoadCommandType SegmentLoadType = is64Bit() ?
419     macho::LCT_Segment64 : macho::LCT_Segment;
420 
421   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
422   for (unsigned I = 0; ; ++I) {
423     if (Load.C.Type == macho::LCT_Symtab) {
424       assert(!SymtabLoadCmd && "Multiple symbol tables");
425       SymtabLoadCmd = Load.Ptr;
426     } else if (Load.C.Type == macho::LCT_Dysymtab) {
427       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
428       DysymtabLoadCmd = Load.Ptr;
429     } else if (Load.C.Type == SegmentLoadType) {
430       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
431       for (unsigned J = 0; J < NumSections; ++J) {
432         const char *Sec = getSectionPtr(this, Load, J);
433         Sections.push_back(Sec);
434       }
435     }
436 
437     if (I == LoadCommandCount - 1)
438       break;
439     else
440       Load = getNextLoadCommandInfo(Load);
441   }
442 }
443 
444 error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
445                                           SymbolRef &Res) const {
446   unsigned SymbolTableEntrySize = is64Bit() ?
447     sizeof(macho::Symbol64TableEntry) :
448     sizeof(macho::SymbolTableEntry);
449   Symb.p += SymbolTableEntrySize;
450   Res = SymbolRef(Symb, this);
451   return object_error::success;
452 }
453 
454 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
455                                           StringRef &Res) const {
456   StringRef StringTable = getStringTableData();
457   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
458   const char *Start = &StringTable.data()[Entry.StringIndex];
459   Res = StringRef(Start);
460   return object_error::success;
461 }
462 
463 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
464                                              uint64_t &Res) const {
465   if (is64Bit()) {
466     macho::Symbol64TableEntry Entry = getSymbol64TableEntry(Symb);
467     Res = Entry.Value;
468   } else {
469     macho::SymbolTableEntry Entry = getSymbolTableEntry(Symb);
470     Res = Entry.Value;
471   }
472   return object_error::success;
473 }
474 
475 error_code
476 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
477                                      uint64_t &Res) const {
478   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
479   getSymbolAddress(Symb, Res);
480   if (Entry.SectionIndex) {
481     uint64_t Delta;
482     DataRefImpl SecRel;
483     SecRel.d.a = Entry.SectionIndex-1;
484     if (is64Bit()) {
485       macho::Section64 Sec = getSection64(SecRel);
486       Delta = Sec.Offset - Sec.Address;
487     } else {
488       macho::Section Sec = getSection(SecRel);
489       Delta = Sec.Offset - Sec.Address;
490     }
491 
492     Res += Delta;
493   }
494 
495   return object_error::success;
496 }
497 
498 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
499                                                uint32_t &Result) const {
500   uint32_t flags;
501   this->getSymbolFlags(DRI, flags);
502   if (flags & SymbolRef::SF_Common) {
503     SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
504     Result = 1 << MachO::GET_COMM_ALIGN(Entry.Flags);
505   } else {
506     Result = 0;
507   }
508   return object_error::success;
509 }
510 
511 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
512                                           uint64_t &Result) const {
513   uint64_t BeginOffset;
514   uint64_t EndOffset = 0;
515   uint8_t SectionIndex;
516 
517   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
518   uint64_t Value;
519   getSymbolAddress(DRI, Value);
520 
521   BeginOffset = Value;
522 
523   SectionIndex = Entry.SectionIndex;
524   if (!SectionIndex) {
525     uint32_t flags = SymbolRef::SF_None;
526     this->getSymbolFlags(DRI, flags);
527     if (flags & SymbolRef::SF_Common)
528       Result = Value;
529     else
530       Result = UnknownAddressOrSize;
531     return object_error::success;
532   }
533   // Unfortunately symbols are unsorted so we need to touch all
534   // symbols from load command
535   error_code ec;
536   for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E;
537        I.increment(ec)) {
538     DataRefImpl DRI = I->getRawDataRefImpl();
539     Entry = getSymbolTableEntryBase(this, DRI);
540     getSymbolAddress(DRI, Value);
541     if (Entry.SectionIndex == SectionIndex && Value > BeginOffset)
542       if (!EndOffset || Value < EndOffset)
543         EndOffset = Value;
544   }
545   if (!EndOffset) {
546     uint64_t Size;
547     DataRefImpl Sec;
548     Sec.d.a = SectionIndex-1;
549     getSectionSize(Sec, Size);
550     getSectionAddress(Sec, EndOffset);
551     EndOffset += Size;
552   }
553   Result = EndOffset - BeginOffset;
554   return object_error::success;
555 }
556 
557 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
558                                           SymbolRef::Type &Res) const {
559   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
560   uint8_t n_type = Entry.Type;
561 
562   Res = SymbolRef::ST_Other;
563 
564   // If this is a STAB debugging symbol, we can do nothing more.
565   if (n_type & MachO::NlistMaskStab) {
566     Res = SymbolRef::ST_Debug;
567     return object_error::success;
568   }
569 
570   switch (n_type & MachO::NlistMaskType) {
571     case MachO::NListTypeUndefined :
572       Res = SymbolRef::ST_Unknown;
573       break;
574     case MachO::NListTypeSection :
575       Res = SymbolRef::ST_Function;
576       break;
577   }
578   return object_error::success;
579 }
580 
581 error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
582                                                 char &Res) const {
583   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
584   uint8_t Type = Entry.Type;
585   uint16_t Flags = Entry.Flags;
586 
587   char Char;
588   switch (Type & macho::STF_TypeMask) {
589     case macho::STT_Undefined:
590       Char = 'u';
591       break;
592     case macho::STT_Absolute:
593     case macho::STT_Section:
594       Char = 's';
595       break;
596     default:
597       Char = '?';
598       break;
599   }
600 
601   if (Flags & (macho::STF_External | macho::STF_PrivateExtern))
602     Char = toupper(static_cast<unsigned char>(Char));
603   Res = Char;
604   return object_error::success;
605 }
606 
607 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
608                                            uint32_t &Result) const {
609   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
610 
611   uint8_t MachOType = Entry.Type;
612   uint16_t MachOFlags = Entry.Flags;
613 
614   // TODO: Correctly set SF_ThreadLocal
615   Result = SymbolRef::SF_None;
616 
617   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
618     Result |= SymbolRef::SF_Undefined;
619 
620   if (MachOFlags & macho::STF_StabsEntryMask)
621     Result |= SymbolRef::SF_FormatSpecific;
622 
623   if (MachOType & MachO::NlistMaskExternal) {
624     Result |= SymbolRef::SF_Global;
625     if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined) {
626       uint64_t Value;
627       getSymbolAddress(DRI, Value);
628       if (Value)
629         Result |= SymbolRef::SF_Common;
630     }
631   }
632 
633   if (MachOFlags & (MachO::NListDescWeakRef | MachO::NListDescWeakDef))
634     Result |= SymbolRef::SF_Weak;
635 
636   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeAbsolute)
637     Result |= SymbolRef::SF_Absolute;
638 
639   return object_error::success;
640 }
641 
642 error_code
643 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
644                                   section_iterator &Res) const {
645   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
646   uint8_t index = Entry.SectionIndex;
647 
648   if (index == 0) {
649     Res = end_sections();
650   } else {
651     DataRefImpl DRI;
652     DRI.d.a = index - 1;
653     Res = section_iterator(SectionRef(DRI, this));
654   }
655 
656   return object_error::success;
657 }
658 
659 error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
660                                            uint64_t &Val) const {
661   report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
662 }
663 
664 error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
665                                            SectionRef &Res) const {
666   Sec.d.a++;
667   Res = SectionRef(Sec, this);
668   return object_error::success;
669 }
670 
671 error_code
672 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
673   ArrayRef<char> Raw = getSectionRawName(Sec);
674   Result = parseSegmentOrSectionName(Raw.data());
675   return object_error::success;
676 }
677 
678 error_code
679 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
680   if (is64Bit()) {
681     macho::Section64 Sect = getSection64(Sec);
682     Res = Sect.Address;
683   } else {
684     macho::Section Sect = getSection(Sec);
685     Res = Sect.Address;
686   }
687   return object_error::success;
688 }
689 
690 error_code
691 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
692   if (is64Bit()) {
693     macho::Section64 Sect = getSection64(Sec);
694     Res = Sect.Size;
695   } else {
696     macho::Section Sect = getSection(Sec);
697     Res = Sect.Size;
698   }
699 
700   return object_error::success;
701 }
702 
703 error_code
704 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
705   uint32_t Offset;
706   uint64_t Size;
707 
708   if (is64Bit()) {
709     macho::Section64 Sect = getSection64(Sec);
710     Offset = Sect.Offset;
711     Size = Sect.Size;
712   } else {
713     macho::Section Sect =getSection(Sec);
714     Offset = Sect.Offset;
715     Size = Sect.Size;
716   }
717 
718   Res = this->getData().substr(Offset, Size);
719   return object_error::success;
720 }
721 
722 error_code
723 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
724   uint32_t Align;
725   if (is64Bit()) {
726     macho::Section64 Sect = getSection64(Sec);
727     Align = Sect.Align;
728   } else {
729     macho::Section Sect = getSection(Sec);
730     Align = Sect.Align;
731   }
732 
733   Res = uint64_t(1) << Align;
734   return object_error::success;
735 }
736 
737 error_code
738 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
739   uint32_t Flags = getSectionFlags(this, Sec);
740   Res = Flags & macho::SF_PureInstructions;
741   return object_error::success;
742 }
743 
744 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
745   // FIXME: Unimplemented.
746   Result = false;
747   return object_error::success;
748 }
749 
750 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
751   // FIXME: Unimplemented.
752   Result = false;
753   return object_error::success;
754 }
755 
756 error_code
757 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
758                                                bool &Result) const {
759   // FIXME: Unimplemented.
760   Result = true;
761   return object_error::success;
762 }
763 
764 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
765                                              bool &Result) const {
766   // FIXME: Unimplemented.
767   Result = false;
768   return object_error::success;
769 }
770 
771 error_code
772 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
773   uint32_t Flags = getSectionFlags(this, Sec);
774   unsigned SectionType = Flags & MachO::SectionFlagMaskSectionType;
775   Res = SectionType == MachO::SectionTypeZeroFill ||
776     SectionType == MachO::SectionTypeZeroFillLarge;
777   return object_error::success;
778 }
779 
780 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
781                                                   bool &Result) const {
782   // Consider using the code from isSectionText to look for __const sections.
783   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
784   // to use section attributes to distinguish code from data.
785 
786   // FIXME: Unimplemented.
787   Result = false;
788   return object_error::success;
789 }
790 
791 error_code
792 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
793                                        bool &Result) const {
794   SymbolRef::Type ST;
795   this->getSymbolType(Symb, ST);
796   if (ST == SymbolRef::ST_Unknown) {
797     Result = false;
798     return object_error::success;
799   }
800 
801   uint64_t SectBegin, SectEnd;
802   getSectionAddress(Sec, SectBegin);
803   getSectionSize(Sec, SectEnd);
804   SectEnd += SectBegin;
805 
806   uint64_t SymAddr;
807   getSymbolAddress(Symb, SymAddr);
808   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
809 
810   return object_error::success;
811 }
812 
813 relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
814   uint32_t Offset;
815   if (is64Bit()) {
816     macho::Section64 Sect = getSection64(Sec);
817     Offset = Sect.RelocationTableOffset;
818   } else {
819     macho::Section Sect = getSection(Sec);
820     Offset = Sect.RelocationTableOffset;
821   }
822 
823   DataRefImpl Ret;
824   Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
825   return relocation_iterator(RelocationRef(Ret, this));
826 }
827 
828 relocation_iterator
829 MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
830   uint32_t Offset;
831   uint32_t Num;
832   if (is64Bit()) {
833     macho::Section64 Sect = getSection64(Sec);
834     Offset = Sect.RelocationTableOffset;
835     Num = Sect.NumRelocationTableEntries;
836   } else {
837     macho::Section Sect = getSection(Sec);
838     Offset = Sect.RelocationTableOffset;
839     Num = Sect.NumRelocationTableEntries;
840   }
841 
842   const macho::RelocationEntry *P =
843     reinterpret_cast<const macho::RelocationEntry*>(getPtr(this, Offset));
844 
845   DataRefImpl Ret;
846   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
847   return relocation_iterator(RelocationRef(Ret, this));
848 }
849 
850 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
851                                               RelocationRef &Res) const {
852   const macho::RelocationEntry *P =
853     reinterpret_cast<const macho::RelocationEntry *>(Rel.p);
854   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
855   Res = RelocationRef(Rel, this);
856   return object_error::success;
857 }
858 
859 error_code
860 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
861   report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
862 }
863 
864 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
865                                                 uint64_t &Res) const {
866   macho::RelocationEntry RE = getRelocation(Rel);
867   Res = getAnyRelocationAddress(RE);
868   return object_error::success;
869 }
870 
871 error_code
872 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel, SymbolRef &Res) const {
873   macho::RelocationEntry RE = getRelocation(Rel);
874   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
875   bool isExtern = getPlainRelocationExternal(RE);
876   if (!isExtern) {
877     Res = *end_symbols();
878     return object_error::success;
879   }
880 
881   macho::SymtabLoadCommand S = getSymtabLoadCommand();
882   unsigned SymbolTableEntrySize = is64Bit() ?
883     sizeof(macho::Symbol64TableEntry) :
884     sizeof(macho::SymbolTableEntry);
885   uint64_t Offset = S.SymbolTableOffset + SymbolIdx * SymbolTableEntrySize;
886   DataRefImpl Sym;
887   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
888   Res = SymbolRef(Sym, this);
889   return object_error::success;
890 }
891 
892 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
893                                               uint64_t &Res) const {
894   macho::RelocationEntry RE = getRelocation(Rel);
895   Res = getAnyRelocationType(RE);
896   return object_error::success;
897 }
898 
899 error_code
900 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
901                                        SmallVectorImpl<char> &Result) const {
902   StringRef res;
903   uint64_t RType;
904   getRelocationType(Rel, RType);
905 
906   unsigned Arch = this->getArch();
907 
908   switch (Arch) {
909     case Triple::x86: {
910       static const char *const Table[] =  {
911         "GENERIC_RELOC_VANILLA",
912         "GENERIC_RELOC_PAIR",
913         "GENERIC_RELOC_SECTDIFF",
914         "GENERIC_RELOC_PB_LA_PTR",
915         "GENERIC_RELOC_LOCAL_SECTDIFF",
916         "GENERIC_RELOC_TLV" };
917 
918       if (RType > 6)
919         res = "Unknown";
920       else
921         res = Table[RType];
922       break;
923     }
924     case Triple::x86_64: {
925       static const char *const Table[] =  {
926         "X86_64_RELOC_UNSIGNED",
927         "X86_64_RELOC_SIGNED",
928         "X86_64_RELOC_BRANCH",
929         "X86_64_RELOC_GOT_LOAD",
930         "X86_64_RELOC_GOT",
931         "X86_64_RELOC_SUBTRACTOR",
932         "X86_64_RELOC_SIGNED_1",
933         "X86_64_RELOC_SIGNED_2",
934         "X86_64_RELOC_SIGNED_4",
935         "X86_64_RELOC_TLV" };
936 
937       if (RType > 9)
938         res = "Unknown";
939       else
940         res = Table[RType];
941       break;
942     }
943     case Triple::arm: {
944       static const char *const Table[] =  {
945         "ARM_RELOC_VANILLA",
946         "ARM_RELOC_PAIR",
947         "ARM_RELOC_SECTDIFF",
948         "ARM_RELOC_LOCAL_SECTDIFF",
949         "ARM_RELOC_PB_LA_PTR",
950         "ARM_RELOC_BR24",
951         "ARM_THUMB_RELOC_BR22",
952         "ARM_THUMB_32BIT_BRANCH",
953         "ARM_RELOC_HALF",
954         "ARM_RELOC_HALF_SECTDIFF" };
955 
956       if (RType > 9)
957         res = "Unknown";
958       else
959         res = Table[RType];
960       break;
961     }
962     case Triple::ppc: {
963       static const char *const Table[] =  {
964         "PPC_RELOC_VANILLA",
965         "PPC_RELOC_PAIR",
966         "PPC_RELOC_BR14",
967         "PPC_RELOC_BR24",
968         "PPC_RELOC_HI16",
969         "PPC_RELOC_LO16",
970         "PPC_RELOC_HA16",
971         "PPC_RELOC_LO14",
972         "PPC_RELOC_SECTDIFF",
973         "PPC_RELOC_PB_LA_PTR",
974         "PPC_RELOC_HI16_SECTDIFF",
975         "PPC_RELOC_LO16_SECTDIFF",
976         "PPC_RELOC_HA16_SECTDIFF",
977         "PPC_RELOC_JBSR",
978         "PPC_RELOC_LO14_SECTDIFF",
979         "PPC_RELOC_LOCAL_SECTDIFF" };
980 
981       res = Table[RType];
982       break;
983     }
984     case Triple::UnknownArch:
985       res = "Unknown";
986       break;
987   }
988   Result.append(res.begin(), res.end());
989   return object_error::success;
990 }
991 
992 error_code MachOObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
993                                                         int64_t &Res) const {
994   Res = 0;
995   return object_error::success;
996 }
997 
998 error_code
999 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
1000                                           SmallVectorImpl<char> &Result) const {
1001   macho::RelocationEntry RE = getRelocation(Rel);
1002 
1003   unsigned Arch = this->getArch();
1004 
1005   std::string fmtbuf;
1006   raw_string_ostream fmt(fmtbuf);
1007   unsigned Type = this->getAnyRelocationType(RE);
1008   bool IsPCRel = this->getAnyRelocationPCRel(RE);
1009 
1010   // Determine any addends that should be displayed with the relocation.
1011   // These require decoding the relocation type, which is triple-specific.
1012 
1013   // X86_64 has entirely custom relocation types.
1014   if (Arch == Triple::x86_64) {
1015     bool isPCRel = getAnyRelocationPCRel(RE);
1016 
1017     switch (Type) {
1018       case macho::RIT_X86_64_GOTLoad:   // X86_64_RELOC_GOT_LOAD
1019       case macho::RIT_X86_64_GOT: {     // X86_64_RELOC_GOT
1020         printRelocationTargetName(this, RE, fmt);
1021         fmt << "@GOT";
1022         if (isPCRel) fmt << "PCREL";
1023         break;
1024       }
1025       case macho::RIT_X86_64_Subtractor: { // X86_64_RELOC_SUBTRACTOR
1026         DataRefImpl RelNext = Rel;
1027         RelNext.d.a++;
1028         macho::RelocationEntry RENext = getRelocation(RelNext);
1029 
1030         // X86_64_SUBTRACTOR must be followed by a relocation of type
1031         // X86_64_RELOC_UNSIGNED.
1032         // NOTE: Scattered relocations don't exist on x86_64.
1033         unsigned RType = getAnyRelocationType(RENext);
1034         if (RType != 0)
1035           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1036                              "X86_64_RELOC_SUBTRACTOR.");
1037 
1038         // The X86_64_RELOC_UNSIGNED contains the minuend symbol,
1039         // X86_64_SUBTRACTOR contains to the subtrahend.
1040         printRelocationTargetName(this, RENext, fmt);
1041         fmt << "-";
1042         printRelocationTargetName(this, RE, fmt);
1043         break;
1044       }
1045       case macho::RIT_X86_64_TLV:
1046         printRelocationTargetName(this, RE, fmt);
1047         fmt << "@TLV";
1048         if (isPCRel) fmt << "P";
1049         break;
1050       case macho::RIT_X86_64_Signed1: // X86_64_RELOC_SIGNED1
1051         printRelocationTargetName(this, RE, fmt);
1052         fmt << "-1";
1053         break;
1054       case macho::RIT_X86_64_Signed2: // X86_64_RELOC_SIGNED2
1055         printRelocationTargetName(this, RE, fmt);
1056         fmt << "-2";
1057         break;
1058       case macho::RIT_X86_64_Signed4: // X86_64_RELOC_SIGNED4
1059         printRelocationTargetName(this, RE, fmt);
1060         fmt << "-4";
1061         break;
1062       default:
1063         printRelocationTargetName(this, RE, fmt);
1064         break;
1065     }
1066   // X86 and ARM share some relocation types in common.
1067   } else if (Arch == Triple::x86 || Arch == Triple::arm) {
1068     // Generic relocation types...
1069     switch (Type) {
1070       case macho::RIT_Pair: // GENERIC_RELOC_PAIR - prints no info
1071         return object_error::success;
1072       case macho::RIT_Difference: { // GENERIC_RELOC_SECTDIFF
1073         DataRefImpl RelNext = Rel;
1074         RelNext.d.a++;
1075         macho::RelocationEntry RENext = getRelocation(RelNext);
1076 
1077         // X86 sect diff's must be followed by a relocation of type
1078         // GENERIC_RELOC_PAIR.
1079         unsigned RType = getAnyRelocationType(RENext);
1080 
1081         if (RType != 1)
1082           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1083                              "GENERIC_RELOC_SECTDIFF.");
1084 
1085         printRelocationTargetName(this, RE, fmt);
1086         fmt << "-";
1087         printRelocationTargetName(this, RENext, fmt);
1088         break;
1089       }
1090     }
1091 
1092     if (Arch == Triple::x86) {
1093       // All X86 relocations that need special printing were already
1094       // handled in the generic code.
1095       switch (Type) {
1096         case macho::RIT_Generic_LocalDifference:{// GENERIC_RELOC_LOCAL_SECTDIFF
1097           DataRefImpl RelNext = Rel;
1098           RelNext.d.a++;
1099           macho::RelocationEntry RENext = getRelocation(RelNext);
1100 
1101           // X86 sect diff's must be followed by a relocation of type
1102           // GENERIC_RELOC_PAIR.
1103           unsigned RType = getAnyRelocationType(RENext);
1104           if (RType != 1)
1105             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1106                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1107 
1108           printRelocationTargetName(this, RE, fmt);
1109           fmt << "-";
1110           printRelocationTargetName(this, RENext, fmt);
1111           break;
1112         }
1113         case macho::RIT_Generic_TLV: {
1114           printRelocationTargetName(this, RE, fmt);
1115           fmt << "@TLV";
1116           if (IsPCRel) fmt << "P";
1117           break;
1118         }
1119         default:
1120           printRelocationTargetName(this, RE, fmt);
1121       }
1122     } else { // ARM-specific relocations
1123       switch (Type) {
1124         case macho::RIT_ARM_Half:             // ARM_RELOC_HALF
1125         case macho::RIT_ARM_HalfDifference: { // ARM_RELOC_HALF_SECTDIFF
1126           // Half relocations steal a bit from the length field to encode
1127           // whether this is an upper16 or a lower16 relocation.
1128           bool isUpper = getAnyRelocationLength(RE) >> 1;
1129 
1130           if (isUpper)
1131             fmt << ":upper16:(";
1132           else
1133             fmt << ":lower16:(";
1134           printRelocationTargetName(this, RE, fmt);
1135 
1136           DataRefImpl RelNext = Rel;
1137           RelNext.d.a++;
1138           macho::RelocationEntry RENext = getRelocation(RelNext);
1139 
1140           // ARM half relocs must be followed by a relocation of type
1141           // ARM_RELOC_PAIR.
1142           unsigned RType = getAnyRelocationType(RENext);
1143           if (RType != 1)
1144             report_fatal_error("Expected ARM_RELOC_PAIR after "
1145                                "GENERIC_RELOC_HALF");
1146 
1147           // NOTE: The half of the target virtual address is stashed in the
1148           // address field of the secondary relocation, but we can't reverse
1149           // engineer the constant offset from it without decoding the movw/movt
1150           // instruction to find the other half in its immediate field.
1151 
1152           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1153           // symbol/section pointer of the follow-on relocation.
1154           if (Type == macho::RIT_ARM_HalfDifference) {
1155             fmt << "-";
1156             printRelocationTargetName(this, RENext, fmt);
1157           }
1158 
1159           fmt << ")";
1160           break;
1161         }
1162         default: {
1163           printRelocationTargetName(this, RE, fmt);
1164         }
1165       }
1166     }
1167   } else
1168     printRelocationTargetName(this, RE, fmt);
1169 
1170   fmt.flush();
1171   Result.append(fmtbuf.begin(), fmtbuf.end());
1172   return object_error::success;
1173 }
1174 
1175 error_code
1176 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1177   unsigned Arch = getArch();
1178   uint64_t Type;
1179   getRelocationType(Rel, Type);
1180 
1181   Result = false;
1182 
1183   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1184   // is always hidden.
1185   if (Arch == Triple::x86 || Arch == Triple::arm) {
1186     if (Type == macho::RIT_Pair) Result = true;
1187   } else if (Arch == Triple::x86_64) {
1188     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1189     // an X864_64_RELOC_SUBTRACTOR.
1190     if (Type == macho::RIT_X86_64_Unsigned && Rel.d.a > 0) {
1191       DataRefImpl RelPrev = Rel;
1192       RelPrev.d.a--;
1193       uint64_t PrevType;
1194       getRelocationType(RelPrev, PrevType);
1195       if (PrevType == macho::RIT_X86_64_Subtractor)
1196         Result = true;
1197     }
1198   }
1199 
1200   return object_error::success;
1201 }
1202 
1203 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1204                                            LibraryRef &Res) const {
1205   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1206 }
1207 
1208 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1209                                            StringRef &Res) const {
1210   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1211 }
1212 
1213 symbol_iterator MachOObjectFile::begin_symbols() const {
1214   DataRefImpl DRI;
1215   if (!SymtabLoadCmd)
1216     return symbol_iterator(SymbolRef(DRI, this));
1217 
1218   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1219   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.SymbolTableOffset));
1220   return symbol_iterator(SymbolRef(DRI, this));
1221 }
1222 
1223 symbol_iterator MachOObjectFile::end_symbols() const {
1224   DataRefImpl DRI;
1225   if (!SymtabLoadCmd)
1226     return symbol_iterator(SymbolRef(DRI, this));
1227 
1228   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1229   unsigned SymbolTableEntrySize = is64Bit() ?
1230     sizeof(macho::Symbol64TableEntry) :
1231     sizeof(macho::SymbolTableEntry);
1232   unsigned Offset = Symtab.SymbolTableOffset +
1233     Symtab.NumSymbolTableEntries * SymbolTableEntrySize;
1234   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1235   return symbol_iterator(SymbolRef(DRI, this));
1236 }
1237 
1238 symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
1239   // TODO: implement
1240   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1241 }
1242 
1243 symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
1244   // TODO: implement
1245   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1246 }
1247 
1248 section_iterator MachOObjectFile::begin_sections() const {
1249   DataRefImpl DRI;
1250   return section_iterator(SectionRef(DRI, this));
1251 }
1252 
1253 section_iterator MachOObjectFile::end_sections() const {
1254   DataRefImpl DRI;
1255   DRI.d.a = Sections.size();
1256   return section_iterator(SectionRef(DRI, this));
1257 }
1258 
1259 library_iterator MachOObjectFile::begin_libraries_needed() const {
1260   // TODO: implement
1261   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1262 }
1263 
1264 library_iterator MachOObjectFile::end_libraries_needed() const {
1265   // TODO: implement
1266   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1267 }
1268 
1269 uint8_t MachOObjectFile::getBytesInAddress() const {
1270   return is64Bit() ? 8 : 4;
1271 }
1272 
1273 StringRef MachOObjectFile::getFileFormatName() const {
1274   unsigned CPUType = getCPUType(this);
1275   if (!is64Bit()) {
1276     switch (CPUType) {
1277     case llvm::MachO::CPUTypeI386:
1278       return "Mach-O 32-bit i386";
1279     case llvm::MachO::CPUTypeARM:
1280       return "Mach-O arm";
1281     case llvm::MachO::CPUTypePowerPC:
1282       return "Mach-O 32-bit ppc";
1283     default:
1284       assert((CPUType & llvm::MachO::CPUArchABI64) == 0 &&
1285              "64-bit object file when we're not 64-bit?");
1286       return "Mach-O 32-bit unknown";
1287     }
1288   }
1289 
1290   // Make sure the cpu type has the correct mask.
1291   assert((CPUType & llvm::MachO::CPUArchABI64)
1292 	 == llvm::MachO::CPUArchABI64 &&
1293 	 "32-bit object file when we're 64-bit?");
1294 
1295   switch (CPUType) {
1296   case llvm::MachO::CPUTypeX86_64:
1297     return "Mach-O 64-bit x86-64";
1298   case llvm::MachO::CPUTypePowerPC64:
1299     return "Mach-O 64-bit ppc64";
1300   default:
1301     return "Mach-O 64-bit unknown";
1302   }
1303 }
1304 
1305 unsigned MachOObjectFile::getArch() const {
1306   switch (getCPUType(this)) {
1307   case llvm::MachO::CPUTypeI386:
1308     return Triple::x86;
1309   case llvm::MachO::CPUTypeX86_64:
1310     return Triple::x86_64;
1311   case llvm::MachO::CPUTypeARM:
1312     return Triple::arm;
1313   case llvm::MachO::CPUTypePowerPC:
1314     return Triple::ppc;
1315   case llvm::MachO::CPUTypePowerPC64:
1316     return Triple::ppc64;
1317   default:
1318     return Triple::UnknownArch;
1319   }
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 StringRef
1340 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1341   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1342   return parseSegmentOrSectionName(Raw.data());
1343 }
1344 
1345 ArrayRef<char>
1346 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1347   const SectionBase *Base =
1348     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1349   return ArrayRef<char>(Base->Name);
1350 }
1351 
1352 ArrayRef<char>
1353 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1354   const SectionBase *Base =
1355     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1356   return ArrayRef<char>(Base->SegmentName);
1357 }
1358 
1359 bool
1360 MachOObjectFile::isRelocationScattered(const macho::RelocationEntry &RE)
1361   const {
1362   if (getCPUType(this) == llvm::MachO::CPUTypeX86_64)
1363     return false;
1364   return getPlainRelocationAddress(RE) & macho::RF_Scattered;
1365 }
1366 
1367 unsigned MachOObjectFile::getPlainRelocationSymbolNum(const macho::RelocationEntry &RE) const {
1368   if (isLittleEndian())
1369     return RE.Word1 & 0xffffff;
1370   return RE.Word1 >> 8;
1371 }
1372 
1373 bool MachOObjectFile::getPlainRelocationExternal(const macho::RelocationEntry &RE) const {
1374   if (isLittleEndian())
1375     return (RE.Word1 >> 27) & 1;
1376   return (RE.Word1 >> 4) & 1;
1377 }
1378 
1379 bool
1380 MachOObjectFile::getScatteredRelocationScattered(const macho::RelocationEntry &RE) const {
1381   return RE.Word0 >> 31;
1382 }
1383 
1384 uint32_t
1385 MachOObjectFile::getScatteredRelocationValue(const macho::RelocationEntry &RE) const {
1386   return RE.Word1;
1387 }
1388 
1389 unsigned
1390 MachOObjectFile::getAnyRelocationAddress(const macho::RelocationEntry &RE) const {
1391   if (isRelocationScattered(RE))
1392     return getScatteredRelocationAddress(RE);
1393   return getPlainRelocationAddress(RE);
1394 }
1395 
1396 unsigned
1397 MachOObjectFile::getAnyRelocationPCRel(const macho::RelocationEntry &RE) const {
1398   if (isRelocationScattered(RE))
1399     return getScatteredRelocationPCRel(this, RE);
1400   return getPlainRelocationPCRel(this, RE);
1401 }
1402 
1403 unsigned
1404 MachOObjectFile::getAnyRelocationLength(const macho::RelocationEntry &RE) const {
1405   if (isRelocationScattered(RE))
1406     return getScatteredRelocationLength(RE);
1407   return getPlainRelocationLength(this, RE);
1408 }
1409 
1410 unsigned
1411 MachOObjectFile::getAnyRelocationType(const macho::RelocationEntry &RE) const {
1412   if (isRelocationScattered(RE))
1413     return getScatteredRelocationType(RE);
1414   return getPlainRelocationType(this, RE);
1415 }
1416 
1417 SectionRef
1418 MachOObjectFile::getRelocationSection(const macho::RelocationEntry &RE) const {
1419   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1420     return *end_sections();
1421   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1422   DataRefImpl DRI;
1423   DRI.d.a = SecNum;
1424   return SectionRef(DRI, this);
1425 }
1426 
1427 MachOObjectFile::LoadCommandInfo
1428 MachOObjectFile::getFirstLoadCommandInfo() const {
1429   MachOObjectFile::LoadCommandInfo Load;
1430 
1431   unsigned HeaderSize = is64Bit() ? macho::Header64Size : macho::Header32Size;
1432   Load.Ptr = getPtr(this, HeaderSize);
1433   Load.C = getStruct<macho::LoadCommand>(this, Load.Ptr);
1434   return Load;
1435 }
1436 
1437 MachOObjectFile::LoadCommandInfo
1438 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1439   MachOObjectFile::LoadCommandInfo Next;
1440   Next.Ptr = L.Ptr + L.C.Size;
1441   Next.C = getStruct<macho::LoadCommand>(this, Next.Ptr);
1442   return Next;
1443 }
1444 
1445 macho::Section MachOObjectFile::getSection(DataRefImpl DRI) const {
1446   return getStruct<macho::Section>(this, Sections[DRI.d.a]);
1447 }
1448 
1449 macho::Section64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1450   return getStruct<macho::Section64>(this, Sections[DRI.d.a]);
1451 }
1452 
1453 macho::Section MachOObjectFile::getSection(const LoadCommandInfo &L,
1454                                            unsigned Index) const {
1455   const char *Sec = getSectionPtr(this, L, Index);
1456   return getStruct<macho::Section>(this, Sec);
1457 }
1458 
1459 macho::Section64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1460                                                unsigned Index) const {
1461   const char *Sec = getSectionPtr(this, L, Index);
1462   return getStruct<macho::Section64>(this, Sec);
1463 }
1464 
1465 macho::SymbolTableEntry
1466 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1467   const char *P = reinterpret_cast<const char *>(DRI.p);
1468   return getStruct<macho::SymbolTableEntry>(this, P);
1469 }
1470 
1471 macho::Symbol64TableEntry
1472 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1473   const char *P = reinterpret_cast<const char *>(DRI.p);
1474   return getStruct<macho::Symbol64TableEntry>(this, P);
1475 }
1476 
1477 macho::LinkeditDataLoadCommand
1478 MachOObjectFile::getLinkeditDataLoadCommand(const MachOObjectFile::LoadCommandInfo &L) const {
1479   return getStruct<macho::LinkeditDataLoadCommand>(this, L.Ptr);
1480 }
1481 
1482 macho::SegmentLoadCommand
1483 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1484   return getStruct<macho::SegmentLoadCommand>(this, L.Ptr);
1485 }
1486 
1487 macho::Segment64LoadCommand
1488 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1489   return getStruct<macho::Segment64LoadCommand>(this, L.Ptr);
1490 }
1491 
1492 macho::LinkerOptionsLoadCommand
1493 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1494   return getStruct<macho::LinkerOptionsLoadCommand>(this, L.Ptr);
1495 }
1496 
1497 macho::RelocationEntry
1498 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1499   const char *P = reinterpret_cast<const char *>(Rel.p);
1500   return getStruct<macho::RelocationEntry>(this, P);
1501 }
1502 
1503 macho::Header MachOObjectFile::getHeader() const {
1504   return getStruct<macho::Header>(this, getPtr(this, 0));
1505 }
1506 
1507 macho::Header64Ext MachOObjectFile::getHeader64Ext() const {
1508   return
1509     getStruct<macho::Header64Ext>(this, getPtr(this, sizeof(macho::Header)));
1510 }
1511 
1512 macho::IndirectSymbolTableEntry MachOObjectFile::getIndirectSymbolTableEntry(
1513                                           const macho::DysymtabLoadCommand &DLC,
1514                                           unsigned Index) const {
1515   uint64_t Offset = DLC.IndirectSymbolTableOffset +
1516     Index * sizeof(macho::IndirectSymbolTableEntry);
1517   return getStruct<macho::IndirectSymbolTableEntry>(this, getPtr(this, Offset));
1518 }
1519 
1520 macho::DataInCodeTableEntry
1521 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1522                                          unsigned Index) const {
1523   uint64_t Offset = DataOffset + Index * sizeof(macho::DataInCodeTableEntry);
1524   return getStruct<macho::DataInCodeTableEntry>(this, getPtr(this, Offset));
1525 }
1526 
1527 macho::SymtabLoadCommand MachOObjectFile::getSymtabLoadCommand() const {
1528   return getStruct<macho::SymtabLoadCommand>(this, SymtabLoadCmd);
1529 }
1530 
1531 macho::DysymtabLoadCommand MachOObjectFile::getDysymtabLoadCommand() const {
1532   return getStruct<macho::DysymtabLoadCommand>(this, DysymtabLoadCmd);
1533 }
1534 
1535 StringRef MachOObjectFile::getStringTableData() const {
1536   macho::SymtabLoadCommand S = getSymtabLoadCommand();
1537   return getData().substr(S.StringTableOffset, S.StringTableSize);
1538 }
1539 
1540 bool MachOObjectFile::is64Bit() const {
1541   return getType() == getMachOType(false, true) ||
1542     getType() == getMachOType(true, true);
1543 }
1544 
1545 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1546                                    SmallVectorImpl<uint64_t> &Out) const {
1547   DataExtractor extractor(ObjectFile::getData(), true, 0);
1548 
1549   uint32_t offset = Index;
1550   uint64_t data = 0;
1551   while (uint64_t delta = extractor.getULEB128(&offset)) {
1552     data += delta;
1553     Out.push_back(data);
1554   }
1555 }
1556 
1557 ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
1558   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1559   error_code ec;
1560   ObjectFile *Ret;
1561   if (Magic == "\xFE\xED\xFA\xCE")
1562     Ret = new MachOObjectFile(Buffer, false, false, ec);
1563   else if (Magic == "\xCE\xFA\xED\xFE")
1564     Ret = new MachOObjectFile(Buffer, true, false, ec);
1565   else if (Magic == "\xFE\xED\xFA\xCF")
1566     Ret = new MachOObjectFile(Buffer, false, true, ec);
1567   else if (Magic == "\xCF\xFA\xED\xFE")
1568     Ret = new MachOObjectFile(Buffer, true, true, ec);
1569   else
1570     return NULL;
1571 
1572   if (ec)
1573     return NULL;
1574   return Ret;
1575 }
1576 
1577 } // end namespace object
1578 } // end namespace llvm
1579