xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 137faa05a242285bd4771ceb9dfb100c82e74c89) 
1 //===- MachOObjectFile.cpp - Mach-O object file binding ---------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the MachOObjectFile class, which binds the MachOObject
11 // class to the generic ObjectFile wrapper.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "llvm/Object/MachO.h"
16 #include "llvm/ADT/Triple.h"
17 #include "llvm/Object/MachOFormat.h"
18 #include "llvm/Support/DataExtractor.h"
19 #include "llvm/Support/Format.h"
20 #include "llvm/Support/Host.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include <cctype>
23 #include <cstring>
24 #include <limits>
25 
26 using namespace llvm;
27 using namespace object;
28 
29 namespace llvm {
30 namespace object {
31 
32 struct SymbolTableEntryBase {
33   uint32_t StringIndex;
34   uint8_t Type;
35   uint8_t SectionIndex;
36   uint16_t Flags;
37 };
38 
39 struct SectionBase {
40   char Name[16];
41   char SegmentName[16];
42 };
43 
44 template<typename T>
45 static void SwapValue(T &Value) {
46   Value = sys::SwapByteOrder(Value);
47 }
48 
49 template<typename T>
50 static void SwapStruct(T &Value);
51 
52 template<>
53 void SwapStruct(macho::RelocationEntry &H) {
54   SwapValue(H.Word0);
55   SwapValue(H.Word1);
56 }
57 
58 template<>
59 void SwapStruct(macho::LoadCommand &L) {
60   SwapValue(L.Type);
61   SwapValue(L.Size);
62 }
63 
64 template<>
65 void SwapStruct(SymbolTableEntryBase &S) {
66   SwapValue(S.StringIndex);
67   SwapValue(S.Flags);
68 }
69 
70 template<>
71 void SwapStruct(macho::Section &S) {
72   SwapValue(S.Address);
73   SwapValue(S.Size);
74   SwapValue(S.Offset);
75   SwapValue(S.Align);
76   SwapValue(S.RelocationTableOffset);
77   SwapValue(S.NumRelocationTableEntries);
78   SwapValue(S.Flags);
79   SwapValue(S.Reserved1);
80   SwapValue(S.Reserved2);
81 }
82 
83 template<>
84 void SwapStruct(macho::Section64 &S) {
85   SwapValue(S.Address);
86   SwapValue(S.Size);
87   SwapValue(S.Offset);
88   SwapValue(S.Align);
89   SwapValue(S.RelocationTableOffset);
90   SwapValue(S.NumRelocationTableEntries);
91   SwapValue(S.Flags);
92   SwapValue(S.Reserved1);
93   SwapValue(S.Reserved2);
94   SwapValue(S.Reserved3);
95 }
96 
97 template<>
98 void SwapStruct(macho::SymbolTableEntry &S) {
99   SwapValue(S.StringIndex);
100   SwapValue(S.Flags);
101   SwapValue(S.Value);
102 }
103 
104 template<>
105 void SwapStruct(macho::Symbol64TableEntry &S) {
106   SwapValue(S.StringIndex);
107   SwapValue(S.Flags);
108   SwapValue(S.Value);
109 }
110 
111 template<>
112 void SwapStruct(macho::Header &H) {
113   SwapValue(H.Magic);
114   SwapValue(H.CPUType);
115   SwapValue(H.CPUSubtype);
116   SwapValue(H.FileType);
117   SwapValue(H.NumLoadCommands);
118   SwapValue(H.SizeOfLoadCommands);
119   SwapValue(H.Flags);
120 }
121 
122 template<>
123 void SwapStruct(macho::SymtabLoadCommand &C) {
124   SwapValue(C.Type);
125   SwapValue(C.Size);
126   SwapValue(C.SymbolTableOffset);
127   SwapValue(C.NumSymbolTableEntries);
128   SwapValue(C.StringTableOffset);
129   SwapValue(C.StringTableSize);
130 }
131 
132 template<>
133 void SwapStruct(macho::LinkeditDataLoadCommand &C) {
134   SwapValue(C.Type);
135   SwapValue(C.Size);
136   SwapValue(C.DataOffset);
137   SwapValue(C.DataSize);
138 }
139 
140 template<>
141 void SwapStruct(macho::SegmentLoadCommand &C) {
142   SwapValue(C.Type);
143   SwapValue(C.Size);
144   SwapValue(C.VMAddress);
145   SwapValue(C.VMSize);
146   SwapValue(C.FileOffset);
147   SwapValue(C.FileSize);
148   SwapValue(C.MaxVMProtection);
149   SwapValue(C.InitialVMProtection);
150   SwapValue(C.NumSections);
151   SwapValue(C.Flags);
152 }
153 
154 template<>
155 void SwapStruct(macho::Segment64LoadCommand &C) {
156   SwapValue(C.Type);
157   SwapValue(C.Size);
158   SwapValue(C.VMAddress);
159   SwapValue(C.VMSize);
160   SwapValue(C.FileOffset);
161   SwapValue(C.FileSize);
162   SwapValue(C.MaxVMProtection);
163   SwapValue(C.InitialVMProtection);
164   SwapValue(C.NumSections);
165   SwapValue(C.Flags);
166 }
167 
168 template<typename T>
169 T getStruct(const MachOObjectFile *O, const char *P) {
170   T Cmd;
171   memcpy(&Cmd, P, sizeof(T));
172   if (O->isLittleEndian() != sys::IsLittleEndianHost)
173     SwapStruct(Cmd);
174   return Cmd;
175 }
176 
177 static macho::SegmentLoadCommand
178 getSegmentLoadCommand(const MachOObjectFile *O,
179                       const MachOObjectFile::LoadCommandInfo &L) {
180   return getStruct<macho::SegmentLoadCommand>(O, L.Ptr);
181 }
182 
183 static macho::Segment64LoadCommand
184 getSegment64LoadCommand(const MachOObjectFile *O,
185                         const MachOObjectFile::LoadCommandInfo &L) {
186   return getStruct<macho::Segment64LoadCommand>(O, L.Ptr);
187 }
188 
189 static uint32_t
190 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
191                                  const MachOObjectFile::LoadCommandInfo &L) {
192   if (O->is64Bit()) {
193     macho::Segment64LoadCommand S = getSegment64LoadCommand(O, L);
194     return S.NumSections;
195   }
196   macho::SegmentLoadCommand S = getSegmentLoadCommand(O, L);
197   return S.NumSections;
198 }
199 
200 static const SectionBase *
201 getSectionBase(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
202                unsigned Sec) {
203   uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
204 
205   bool Is64 = O->is64Bit();
206   unsigned SegmentLoadSize = Is64 ? sizeof(macho::Segment64LoadCommand) :
207                                     sizeof(macho::SegmentLoadCommand);
208   unsigned SectionSize = Is64 ? sizeof(macho::Section64) :
209                                 sizeof(macho::Section);
210 
211   uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
212   return reinterpret_cast<const SectionBase*>(SectionAddr);
213 }
214 
215 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
216   return O->getData().substr(Offset, 1).data();
217 }
218 
219 static const char *getSymbolTableEntryPtr(const MachOObjectFile *O,
220                                           DataRefImpl DRI) {
221   macho::SymtabLoadCommand S = O->getSymtabLoadCommand();
222 
223   unsigned Index = DRI.d.b;
224 
225   unsigned SymbolTableEntrySize = O->is64Bit() ?
226     sizeof(macho::Symbol64TableEntry) :
227     sizeof(macho::SymbolTableEntry);
228 
229   uint64_t Offset = S.SymbolTableOffset + Index * SymbolTableEntrySize;
230   return getPtr(O, Offset);
231 }
232 
233 static SymbolTableEntryBase
234 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
235   const char *P = getSymbolTableEntryPtr(O, DRI);
236   return getStruct<SymbolTableEntryBase>(O, P);
237 }
238 
239 static StringRef parseSegmentOrSectionName(const char *P) {
240   if (P[15] == 0)
241     // Null terminated.
242     return P;
243   // Not null terminated, so this is a 16 char string.
244   return StringRef(P, 16);
245 }
246 
247 // Helper to advance a section or symbol iterator multiple increments at a time.
248 template<class T>
249 static error_code advance(T &it, size_t Val) {
250   error_code ec;
251   while (Val--) {
252     it.increment(ec);
253   }
254   return ec;
255 }
256 
257 template<class T>
258 static void advanceTo(T &it, size_t Val) {
259   if (error_code ec = advance(it, Val))
260     report_fatal_error(ec.message());
261 }
262 
263 static unsigned getCPUType(const MachOObjectFile *O) {
264   return O->getHeader().CPUType;
265 }
266 
267 static void printRelocationTargetName(const MachOObjectFile *O,
268                                       const macho::RelocationEntry &RE,
269                                       raw_string_ostream &fmt) {
270   bool IsScattered = O->isRelocationScattered(RE);
271 
272   // Target of a scattered relocation is an address.  In the interest of
273   // generating pretty output, scan through the symbol table looking for a
274   // symbol that aligns with that address.  If we find one, print it.
275   // Otherwise, we just print the hex address of the target.
276   if (IsScattered) {
277     uint32_t Val = O->getPlainRelocationSymbolNum(RE);
278 
279     error_code ec;
280     for (symbol_iterator SI = O->begin_symbols(), SE = O->end_symbols();
281          SI != SE; SI.increment(ec)) {
282       if (ec) report_fatal_error(ec.message());
283 
284       uint64_t Addr;
285       StringRef Name;
286 
287       if ((ec = SI->getAddress(Addr)))
288         report_fatal_error(ec.message());
289       if (Addr != Val) continue;
290       if ((ec = SI->getName(Name)))
291         report_fatal_error(ec.message());
292       fmt << Name;
293       return;
294     }
295 
296     // If we couldn't find a symbol that this relocation refers to, try
297     // to find a section beginning instead.
298     for (section_iterator SI = O->begin_sections(), SE = O->end_sections();
299          SI != SE; SI.increment(ec)) {
300       if (ec) report_fatal_error(ec.message());
301 
302       uint64_t Addr;
303       StringRef Name;
304 
305       if ((ec = SI->getAddress(Addr)))
306         report_fatal_error(ec.message());
307       if (Addr != Val) continue;
308       if ((ec = SI->getName(Name)))
309         report_fatal_error(ec.message());
310       fmt << Name;
311       return;
312     }
313 
314     fmt << format("0x%x", Val);
315     return;
316   }
317 
318   StringRef S;
319   bool isExtern = O->getPlainRelocationExternal(RE);
320   uint64_t Val = O->getAnyRelocationAddress(RE);
321 
322   if (isExtern) {
323     symbol_iterator SI = O->begin_symbols();
324     advanceTo(SI, Val);
325     SI->getName(S);
326   } else {
327     section_iterator SI = O->begin_sections();
328     advanceTo(SI, Val);
329     SI->getName(S);
330   }
331 
332   fmt << S;
333 }
334 
335 static uint32_t getPlainRelocationAddress(const macho::RelocationEntry &RE) {
336   return RE.Word0;
337 }
338 
339 static unsigned
340 getScatteredRelocationAddress(const macho::RelocationEntry &RE) {
341   return RE.Word0 & 0xffffff;
342 }
343 
344 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
345                                     const macho::RelocationEntry &RE) {
346   if (O->isLittleEndian())
347     return (RE.Word1 >> 24) & 1;
348   return (RE.Word1 >> 7) & 1;
349 }
350 
351 static bool
352 getScatteredRelocationPCRel(const MachOObjectFile *O,
353                             const macho::RelocationEntry &RE) {
354   return (RE.Word0 >> 30) & 1;
355 }
356 
357 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
358                                          const macho::RelocationEntry &RE) {
359   if (O->isLittleEndian())
360     return (RE.Word1 >> 25) & 3;
361   return (RE.Word1 >> 5) & 3;
362 }
363 
364 static unsigned
365 getScatteredRelocationLength(const macho::RelocationEntry &RE) {
366   return (RE.Word0 >> 28) & 3;
367 }
368 
369 static unsigned getPlainRelocationType(const MachOObjectFile *O,
370                                        const macho::RelocationEntry &RE) {
371   if (O->isLittleEndian())
372     return RE.Word1 >> 28;
373   return RE.Word1 & 0xf;
374 }
375 
376 static unsigned getScatteredRelocationType(const macho::RelocationEntry &RE) {
377   return (RE.Word0 >> 24) & 0xf;
378 }
379 
380 static uint32_t getSectionFlags(const MachOObjectFile *O,
381                                 DataRefImpl Sec) {
382   if (O->is64Bit()) {
383     macho::Section64 Sect = O->getSection64(Sec);
384     return Sect.Flags;
385   }
386   macho::Section Sect = O->getSection(Sec);
387   return Sect.Flags;
388 }
389 
390 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
391                                  bool IsLittleEndian, bool Is64bits,
392                                  error_code &ec)
393     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
394       SymtabLoadCmd(NULL) {
395   uint32_t LoadCommandCount = this->getHeader().NumLoadCommands;
396   macho::LoadCommandType SegmentLoadType = is64Bit() ?
397     macho::LCT_Segment64 : macho::LCT_Segment;
398 
399   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
400   for (unsigned I = 0; ; ++I) {
401     if (Load.C.Type == macho::LCT_Symtab) {
402       assert(!SymtabLoadCmd && "Multiple symbol tables");
403       SymtabLoadCmd = Load.Ptr;
404     }
405 
406     if (Load.C.Type == SegmentLoadType) {
407       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
408       for (unsigned J = 0; J < NumSections; ++J) {
409         const SectionBase *Sec = getSectionBase(this, Load, J);
410         Sections.push_back(reinterpret_cast<const char*>(Sec));
411       }
412     }
413 
414     if (I == LoadCommandCount - 1)
415       break;
416     else
417       Load = getNextLoadCommandInfo(Load);
418   }
419 }
420 
421 error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
422                                           SymbolRef &Res) const {
423   Symb.d.b++;
424   Res = SymbolRef(Symb, this);
425   return object_error::success;
426 }
427 
428 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
429                                           StringRef &Res) const {
430   macho::SymtabLoadCommand S = getSymtabLoadCommand();
431   const char *StringTable = getPtr(this, S.StringTableOffset);
432   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
433   const char *Start = &StringTable[Entry.StringIndex];
434   Res = StringRef(Start);
435   return object_error::success;
436 }
437 
438 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
439                                              uint64_t &Res) const {
440   if (is64Bit()) {
441     macho::Symbol64TableEntry Entry = getSymbol64TableEntry(Symb);
442     Res = Entry.Value;
443   } else {
444     macho::SymbolTableEntry Entry = getSymbolTableEntry(Symb);
445     Res = Entry.Value;
446   }
447   return object_error::success;
448 }
449 
450 error_code
451 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
452                                      uint64_t &Res) const {
453   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
454   getSymbolAddress(Symb, Res);
455   if (Entry.SectionIndex) {
456     uint64_t Delta;
457     DataRefImpl SecRel;
458     SecRel.d.a = Entry.SectionIndex-1;
459     if (is64Bit()) {
460       macho::Section64 Sec = getSection64(SecRel);
461       Delta = Sec.Offset - Sec.Address;
462     } else {
463       macho::Section Sec = getSection(SecRel);
464       Delta = Sec.Offset - Sec.Address;
465     }
466 
467     Res += Delta;
468   }
469 
470   return object_error::success;
471 }
472 
473 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
474                                           uint64_t &Result) const {
475   uint64_t BeginOffset;
476   uint64_t EndOffset = 0;
477   uint8_t SectionIndex;
478 
479   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
480   uint64_t Value;
481   getSymbolAddress(DRI, Value);
482 
483   BeginOffset = Value;
484 
485   SectionIndex = Entry.SectionIndex;
486   if (!SectionIndex) {
487     uint32_t flags = SymbolRef::SF_None;
488     this->getSymbolFlags(DRI, flags);
489     if (flags & SymbolRef::SF_Common)
490       Result = Value;
491     else
492       Result = UnknownAddressOrSize;
493     return object_error::success;
494   }
495   // Unfortunately symbols are unsorted so we need to touch all
496   // symbols from load command
497   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
498   DRI.d.b = 0;
499   while (DRI.d.b <= Symtab.NumSymbolTableEntries) {
500     Entry = getSymbolTableEntryBase(this, DRI);
501     getSymbolAddress(DRI, Value);
502     if (Entry.SectionIndex == SectionIndex && Value > BeginOffset)
503       if (!EndOffset || Value < EndOffset)
504         EndOffset = Value;
505     DRI.d.b++;
506   }
507   if (!EndOffset) {
508     uint64_t Size;
509     DataRefImpl Sec;
510     Sec.d.a = SectionIndex-1;
511     getSectionSize(Sec, Size);
512     getSectionAddress(Sec, EndOffset);
513     EndOffset += Size;
514   }
515   Result = EndOffset - BeginOffset;
516   return object_error::success;
517 }
518 
519 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
520                                           SymbolRef::Type &Res) const {
521   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
522   uint8_t n_type = Entry.Type;
523 
524   Res = SymbolRef::ST_Other;
525 
526   // If this is a STAB debugging symbol, we can do nothing more.
527   if (n_type & MachO::NlistMaskStab) {
528     Res = SymbolRef::ST_Debug;
529     return object_error::success;
530   }
531 
532   switch (n_type & MachO::NlistMaskType) {
533     case MachO::NListTypeUndefined :
534       Res = SymbolRef::ST_Unknown;
535       break;
536     case MachO::NListTypeSection :
537       Res = SymbolRef::ST_Function;
538       break;
539   }
540   return object_error::success;
541 }
542 
543 error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
544                                                 char &Res) const {
545   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
546   uint8_t Type = Entry.Type;
547   uint16_t Flags = Entry.Flags;
548 
549   char Char;
550   switch (Type & macho::STF_TypeMask) {
551     case macho::STT_Undefined:
552       Char = 'u';
553       break;
554     case macho::STT_Absolute:
555     case macho::STT_Section:
556       Char = 's';
557       break;
558     default:
559       Char = '?';
560       break;
561   }
562 
563   if (Flags & (macho::STF_External | macho::STF_PrivateExtern))
564     Char = toupper(static_cast<unsigned char>(Char));
565   Res = Char;
566   return object_error::success;
567 }
568 
569 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
570                                            uint32_t &Result) const {
571   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
572 
573   uint8_t MachOType = Entry.Type;
574   uint16_t MachOFlags = Entry.Flags;
575 
576   // TODO: Correctly set SF_ThreadLocal
577   Result = SymbolRef::SF_None;
578 
579   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
580     Result |= SymbolRef::SF_Undefined;
581 
582   if (MachOFlags & macho::STF_StabsEntryMask)
583     Result |= SymbolRef::SF_FormatSpecific;
584 
585   if (MachOType & MachO::NlistMaskExternal) {
586     Result |= SymbolRef::SF_Global;
587     if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
588       Result |= SymbolRef::SF_Common;
589   }
590 
591   if (MachOFlags & (MachO::NListDescWeakRef | MachO::NListDescWeakDef))
592     Result |= SymbolRef::SF_Weak;
593 
594   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeAbsolute)
595     Result |= SymbolRef::SF_Absolute;
596 
597   return object_error::success;
598 }
599 
600 error_code
601 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
602                                   section_iterator &Res) const {
603   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
604   uint8_t index = Entry.SectionIndex;
605 
606   if (index == 0) {
607     Res = end_sections();
608   } else {
609     DataRefImpl DRI;
610     DRI.d.a = index - 1;
611     Res = section_iterator(SectionRef(DRI, this));
612   }
613 
614   return object_error::success;
615 }
616 
617 error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
618                                            uint64_t &Val) const {
619   report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
620 }
621 
622 error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
623                                            SectionRef &Res) const {
624   Sec.d.a++;
625   Res = SectionRef(Sec, this);
626   return object_error::success;
627 }
628 
629 error_code
630 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
631   ArrayRef<char> Raw = getSectionRawName(Sec);
632   Result = parseSegmentOrSectionName(Raw.data());
633   return object_error::success;
634 }
635 
636 error_code
637 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
638   if (is64Bit()) {
639     macho::Section64 Sect = getSection64(Sec);
640     Res = Sect.Address;
641   } else {
642     macho::Section Sect = getSection(Sec);
643     Res = Sect.Address;
644   }
645   return object_error::success;
646 }
647 
648 error_code
649 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
650   if (is64Bit()) {
651     macho::Section64 Sect = getSection64(Sec);
652     Res = Sect.Size;
653   } else {
654     macho::Section Sect = getSection(Sec);
655     Res = Sect.Size;
656   }
657 
658   return object_error::success;
659 }
660 
661 error_code
662 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
663   uint32_t Offset;
664   uint64_t Size;
665 
666   if (is64Bit()) {
667     macho::Section64 Sect = getSection64(Sec);
668     Offset = Sect.Offset;
669     Size = Sect.Size;
670   } else {
671     macho::Section Sect =getSection(Sec);
672     Offset = Sect.Offset;
673     Size = Sect.Size;
674   }
675 
676   Res = this->getData().substr(Offset, Size);
677   return object_error::success;
678 }
679 
680 error_code
681 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
682   uint32_t Align;
683   if (is64Bit()) {
684     macho::Section64 Sect = getSection64(Sec);
685     Align = Sect.Align;
686   } else {
687     macho::Section Sect = getSection(Sec);
688     Align = Sect.Align;
689   }
690 
691   Res = uint64_t(1) << Align;
692   return object_error::success;
693 }
694 
695 error_code
696 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
697   uint32_t Flags = getSectionFlags(this, Sec);
698   Res = Flags & macho::SF_PureInstructions;
699   return object_error::success;
700 }
701 
702 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
703   // FIXME: Unimplemented.
704   Result = false;
705   return object_error::success;
706 }
707 
708 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
709   // FIXME: Unimplemented.
710   Result = false;
711   return object_error::success;
712 }
713 
714 error_code
715 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
716                                                bool &Result) const {
717   // FIXME: Unimplemented.
718   Result = true;
719   return object_error::success;
720 }
721 
722 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
723                                              bool &Result) const {
724   // FIXME: Unimplemented.
725   Result = false;
726   return object_error::success;
727 }
728 
729 error_code
730 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
731   uint32_t Flags = getSectionFlags(this, Sec);
732   unsigned SectionType = Flags & MachO::SectionFlagMaskSectionType;
733   Res = SectionType == MachO::SectionTypeZeroFill ||
734     SectionType == MachO::SectionTypeZeroFillLarge;
735   return object_error::success;
736 }
737 
738 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
739                                                   bool &Result) const {
740   // Consider using the code from isSectionText to look for __const sections.
741   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
742   // to use section attributes to distinguish code from data.
743 
744   // FIXME: Unimplemented.
745   Result = false;
746   return object_error::success;
747 }
748 
749 error_code
750 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
751                                        bool &Result) const {
752   SymbolRef::Type ST;
753   this->getSymbolType(Symb, ST);
754   if (ST == SymbolRef::ST_Unknown) {
755     Result = false;
756     return object_error::success;
757   }
758 
759   uint64_t SectBegin, SectEnd;
760   getSectionAddress(Sec, SectBegin);
761   getSectionSize(Sec, SectEnd);
762   SectEnd += SectBegin;
763 
764   uint64_t SymAddr;
765   getSymbolAddress(Symb, SymAddr);
766   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
767 
768   return object_error::success;
769 }
770 
771 relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
772   uint32_t Offset;
773   if (is64Bit()) {
774     macho::Section64 Sect = getSection64(Sec);
775     Offset = Sect.RelocationTableOffset;
776   } else {
777     macho::Section Sect = getSection(Sec);
778     Offset = Sect.RelocationTableOffset;
779   }
780 
781   DataRefImpl Ret;
782   Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
783   return relocation_iterator(RelocationRef(Ret, this));
784 }
785 
786 relocation_iterator
787 MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
788   uint32_t Offset;
789   uint32_t Num;
790   if (is64Bit()) {
791     macho::Section64 Sect = getSection64(Sec);
792     Offset = Sect.RelocationTableOffset;
793     Num = Sect.NumRelocationTableEntries;
794   } else {
795     macho::Section Sect = getSection(Sec);
796     Offset = Sect.RelocationTableOffset;
797     Num = Sect.NumRelocationTableEntries;
798   }
799 
800   const macho::RelocationEntry *P =
801     reinterpret_cast<const macho::RelocationEntry*>(getPtr(this, Offset));
802 
803   DataRefImpl Ret;
804   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
805   return relocation_iterator(RelocationRef(Ret, this));
806 }
807 
808 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
809                                               RelocationRef &Res) const {
810   const macho::RelocationEntry *P =
811     reinterpret_cast<const macho::RelocationEntry *>(Rel.p);
812   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
813   Res = RelocationRef(Rel, this);
814   return object_error::success;
815 }
816 
817 error_code
818 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
819   uint64_t SectAddress;
820   DataRefImpl Sec;
821   Sec.d.a = Rel.d.b;
822   if (is64Bit()) {
823     macho::Section64 Sect = getSection64(Sec);
824     SectAddress = Sect.Address;
825   } else {
826     macho::Section Sect = getSection(Sec);
827     SectAddress = Sect.Address;
828   }
829 
830   macho::RelocationEntry RE = getRelocation(Rel);
831   uint64_t RelAddr = getAnyRelocationAddress(RE);
832   Res = SectAddress + RelAddr;
833   return object_error::success;
834 }
835 
836 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
837                                                 uint64_t &Res) const {
838   macho::RelocationEntry RE = getRelocation(Rel);
839   Res = getAnyRelocationAddress(RE);
840   return object_error::success;
841 }
842 
843 error_code
844 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel, SymbolRef &Res) const {
845   macho::RelocationEntry RE = getRelocation(Rel);
846   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
847   bool isExtern = getPlainRelocationExternal(RE);
848 
849   DataRefImpl Sym;
850   if (isExtern) {
851     Sym.d.b = SymbolIdx;
852   }
853   Res = SymbolRef(Sym, this);
854   return object_error::success;
855 }
856 
857 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
858                                               uint64_t &Res) const {
859   macho::RelocationEntry RE = getRelocation(Rel);
860   Res = getAnyRelocationType(RE);
861   return object_error::success;
862 }
863 
864 error_code
865 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
866                                        SmallVectorImpl<char> &Result) const {
867   StringRef res;
868   uint64_t RType;
869   getRelocationType(Rel, RType);
870 
871   unsigned Arch = this->getArch();
872 
873   switch (Arch) {
874     case Triple::x86: {
875       static const char *const Table[] =  {
876         "GENERIC_RELOC_VANILLA",
877         "GENERIC_RELOC_PAIR",
878         "GENERIC_RELOC_SECTDIFF",
879         "GENERIC_RELOC_PB_LA_PTR",
880         "GENERIC_RELOC_LOCAL_SECTDIFF",
881         "GENERIC_RELOC_TLV" };
882 
883       if (RType > 6)
884         res = "Unknown";
885       else
886         res = Table[RType];
887       break;
888     }
889     case Triple::x86_64: {
890       static const char *const Table[] =  {
891         "X86_64_RELOC_UNSIGNED",
892         "X86_64_RELOC_SIGNED",
893         "X86_64_RELOC_BRANCH",
894         "X86_64_RELOC_GOT_LOAD",
895         "X86_64_RELOC_GOT",
896         "X86_64_RELOC_SUBTRACTOR",
897         "X86_64_RELOC_SIGNED_1",
898         "X86_64_RELOC_SIGNED_2",
899         "X86_64_RELOC_SIGNED_4",
900         "X86_64_RELOC_TLV" };
901 
902       if (RType > 9)
903         res = "Unknown";
904       else
905         res = Table[RType];
906       break;
907     }
908     case Triple::arm: {
909       static const char *const Table[] =  {
910         "ARM_RELOC_VANILLA",
911         "ARM_RELOC_PAIR",
912         "ARM_RELOC_SECTDIFF",
913         "ARM_RELOC_LOCAL_SECTDIFF",
914         "ARM_RELOC_PB_LA_PTR",
915         "ARM_RELOC_BR24",
916         "ARM_THUMB_RELOC_BR22",
917         "ARM_THUMB_32BIT_BRANCH",
918         "ARM_RELOC_HALF",
919         "ARM_RELOC_HALF_SECTDIFF" };
920 
921       if (RType > 9)
922         res = "Unknown";
923       else
924         res = Table[RType];
925       break;
926     }
927     case Triple::ppc: {
928       static const char *const Table[] =  {
929         "PPC_RELOC_VANILLA",
930         "PPC_RELOC_PAIR",
931         "PPC_RELOC_BR14",
932         "PPC_RELOC_BR24",
933         "PPC_RELOC_HI16",
934         "PPC_RELOC_LO16",
935         "PPC_RELOC_HA16",
936         "PPC_RELOC_LO14",
937         "PPC_RELOC_SECTDIFF",
938         "PPC_RELOC_PB_LA_PTR",
939         "PPC_RELOC_HI16_SECTDIFF",
940         "PPC_RELOC_LO16_SECTDIFF",
941         "PPC_RELOC_HA16_SECTDIFF",
942         "PPC_RELOC_JBSR",
943         "PPC_RELOC_LO14_SECTDIFF",
944         "PPC_RELOC_LOCAL_SECTDIFF" };
945 
946       res = Table[RType];
947       break;
948     }
949     case Triple::UnknownArch:
950       res = "Unknown";
951       break;
952   }
953   Result.append(res.begin(), res.end());
954   return object_error::success;
955 }
956 
957 error_code MachOObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
958                                                         int64_t &Res) const {
959   Res = 0;
960   return object_error::success;
961 }
962 
963 error_code
964 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
965                                           SmallVectorImpl<char> &Result) const {
966   macho::RelocationEntry RE = getRelocation(Rel);
967 
968   unsigned Arch = this->getArch();
969 
970   std::string fmtbuf;
971   raw_string_ostream fmt(fmtbuf);
972   unsigned Type = this->getAnyRelocationType(RE);
973   bool IsPCRel = this->getAnyRelocationPCRel(RE);
974 
975   // Determine any addends that should be displayed with the relocation.
976   // These require decoding the relocation type, which is triple-specific.
977 
978   // X86_64 has entirely custom relocation types.
979   if (Arch == Triple::x86_64) {
980     bool isPCRel = getAnyRelocationPCRel(RE);
981 
982     switch (Type) {
983       case macho::RIT_X86_64_GOTLoad:   // X86_64_RELOC_GOT_LOAD
984       case macho::RIT_X86_64_GOT: {     // X86_64_RELOC_GOT
985         printRelocationTargetName(this, RE, fmt);
986         fmt << "@GOT";
987         if (isPCRel) fmt << "PCREL";
988         break;
989       }
990       case macho::RIT_X86_64_Subtractor: { // X86_64_RELOC_SUBTRACTOR
991         DataRefImpl RelNext = Rel;
992         RelNext.d.a++;
993         macho::RelocationEntry RENext = getRelocation(RelNext);
994 
995         // X86_64_SUBTRACTOR must be followed by a relocation of type
996         // X86_64_RELOC_UNSIGNED.
997         // NOTE: Scattered relocations don't exist on x86_64.
998         unsigned RType = getAnyRelocationType(RENext);
999         if (RType != 0)
1000           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1001                              "X86_64_RELOC_SUBTRACTOR.");
1002 
1003         // The X86_64_RELOC_UNSIGNED contains the minuend symbol,
1004         // X86_64_SUBTRACTOR contains to the subtrahend.
1005         printRelocationTargetName(this, RENext, fmt);
1006         fmt << "-";
1007         printRelocationTargetName(this, RE, fmt);
1008         break;
1009       }
1010       case macho::RIT_X86_64_TLV:
1011         printRelocationTargetName(this, RE, fmt);
1012         fmt << "@TLV";
1013         if (isPCRel) fmt << "P";
1014         break;
1015       case macho::RIT_X86_64_Signed1: // X86_64_RELOC_SIGNED1
1016         printRelocationTargetName(this, RE, fmt);
1017         fmt << "-1";
1018         break;
1019       case macho::RIT_X86_64_Signed2: // X86_64_RELOC_SIGNED2
1020         printRelocationTargetName(this, RE, fmt);
1021         fmt << "-2";
1022         break;
1023       case macho::RIT_X86_64_Signed4: // X86_64_RELOC_SIGNED4
1024         printRelocationTargetName(this, RE, fmt);
1025         fmt << "-4";
1026         break;
1027       default:
1028         printRelocationTargetName(this, RE, fmt);
1029         break;
1030     }
1031   // X86 and ARM share some relocation types in common.
1032   } else if (Arch == Triple::x86 || Arch == Triple::arm) {
1033     // Generic relocation types...
1034     switch (Type) {
1035       case macho::RIT_Pair: // GENERIC_RELOC_PAIR - prints no info
1036         return object_error::success;
1037       case macho::RIT_Difference: { // GENERIC_RELOC_SECTDIFF
1038         DataRefImpl RelNext = Rel;
1039         RelNext.d.a++;
1040         macho::RelocationEntry RENext = getRelocation(RelNext);
1041 
1042         // X86 sect diff's must be followed by a relocation of type
1043         // GENERIC_RELOC_PAIR.
1044         unsigned RType = getAnyRelocationType(RENext);
1045 
1046         if (RType != 1)
1047           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1048                              "GENERIC_RELOC_SECTDIFF.");
1049 
1050         printRelocationTargetName(this, RE, fmt);
1051         fmt << "-";
1052         printRelocationTargetName(this, RENext, fmt);
1053         break;
1054       }
1055     }
1056 
1057     if (Arch == Triple::x86) {
1058       // All X86 relocations that need special printing were already
1059       // handled in the generic code.
1060       switch (Type) {
1061         case macho::RIT_Generic_LocalDifference:{// GENERIC_RELOC_LOCAL_SECTDIFF
1062           DataRefImpl RelNext = Rel;
1063           RelNext.d.a++;
1064           macho::RelocationEntry RENext = getRelocation(RelNext);
1065 
1066           // X86 sect diff's must be followed by a relocation of type
1067           // GENERIC_RELOC_PAIR.
1068           unsigned RType = getAnyRelocationType(RENext);
1069           if (RType != 1)
1070             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1071                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1072 
1073           printRelocationTargetName(this, RE, fmt);
1074           fmt << "-";
1075           printRelocationTargetName(this, RENext, fmt);
1076           break;
1077         }
1078         case macho::RIT_Generic_TLV: {
1079           printRelocationTargetName(this, RE, fmt);
1080           fmt << "@TLV";
1081           if (IsPCRel) fmt << "P";
1082           break;
1083         }
1084         default:
1085           printRelocationTargetName(this, RE, fmt);
1086       }
1087     } else { // ARM-specific relocations
1088       switch (Type) {
1089         case macho::RIT_ARM_Half:             // ARM_RELOC_HALF
1090         case macho::RIT_ARM_HalfDifference: { // ARM_RELOC_HALF_SECTDIFF
1091           // Half relocations steal a bit from the length field to encode
1092           // whether this is an upper16 or a lower16 relocation.
1093           bool isUpper = getAnyRelocationLength(RE) >> 1;
1094 
1095           if (isUpper)
1096             fmt << ":upper16:(";
1097           else
1098             fmt << ":lower16:(";
1099           printRelocationTargetName(this, RE, fmt);
1100 
1101           DataRefImpl RelNext = Rel;
1102           RelNext.d.a++;
1103           macho::RelocationEntry RENext = getRelocation(RelNext);
1104 
1105           // ARM half relocs must be followed by a relocation of type
1106           // ARM_RELOC_PAIR.
1107           unsigned RType = getAnyRelocationType(RENext);
1108           if (RType != 1)
1109             report_fatal_error("Expected ARM_RELOC_PAIR after "
1110                                "GENERIC_RELOC_HALF");
1111 
1112           // NOTE: The half of the target virtual address is stashed in the
1113           // address field of the secondary relocation, but we can't reverse
1114           // engineer the constant offset from it without decoding the movw/movt
1115           // instruction to find the other half in its immediate field.
1116 
1117           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1118           // symbol/section pointer of the follow-on relocation.
1119           if (Type == macho::RIT_ARM_HalfDifference) {
1120             fmt << "-";
1121             printRelocationTargetName(this, RENext, fmt);
1122           }
1123 
1124           fmt << ")";
1125           break;
1126         }
1127         default: {
1128           printRelocationTargetName(this, RE, fmt);
1129         }
1130       }
1131     }
1132   } else
1133     printRelocationTargetName(this, RE, fmt);
1134 
1135   fmt.flush();
1136   Result.append(fmtbuf.begin(), fmtbuf.end());
1137   return object_error::success;
1138 }
1139 
1140 error_code
1141 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1142   unsigned Arch = getArch();
1143   uint64_t Type;
1144   getRelocationType(Rel, Type);
1145 
1146   Result = false;
1147 
1148   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1149   // is always hidden.
1150   if (Arch == Triple::x86 || Arch == Triple::arm) {
1151     if (Type == macho::RIT_Pair) Result = true;
1152   } else if (Arch == Triple::x86_64) {
1153     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1154     // an X864_64_RELOC_SUBTRACTOR.
1155     if (Type == macho::RIT_X86_64_Unsigned && Rel.d.a > 0) {
1156       DataRefImpl RelPrev = Rel;
1157       RelPrev.d.a--;
1158       uint64_t PrevType;
1159       getRelocationType(RelPrev, PrevType);
1160       if (PrevType == macho::RIT_X86_64_Subtractor)
1161         Result = true;
1162     }
1163   }
1164 
1165   return object_error::success;
1166 }
1167 
1168 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1169                                            LibraryRef &Res) const {
1170   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1171 }
1172 
1173 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1174                                            StringRef &Res) const {
1175   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1176 }
1177 
1178 symbol_iterator MachOObjectFile::begin_symbols() const {
1179   // DRI.d.a = segment number; DRI.d.b = symbol index.
1180   DataRefImpl DRI;
1181   return symbol_iterator(SymbolRef(DRI, this));
1182 }
1183 
1184 symbol_iterator MachOObjectFile::end_symbols() const {
1185   DataRefImpl DRI;
1186   if (SymtabLoadCmd) {
1187     macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1188     DRI.d.b = Symtab.NumSymbolTableEntries;
1189   }
1190   return symbol_iterator(SymbolRef(DRI, this));
1191 }
1192 
1193 symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
1194   // TODO: implement
1195   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1196 }
1197 
1198 symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
1199   // TODO: implement
1200   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1201 }
1202 
1203 section_iterator MachOObjectFile::begin_sections() const {
1204   DataRefImpl DRI;
1205   return section_iterator(SectionRef(DRI, this));
1206 }
1207 
1208 section_iterator MachOObjectFile::end_sections() const {
1209   DataRefImpl DRI;
1210   DRI.d.a = Sections.size();
1211   return section_iterator(SectionRef(DRI, this));
1212 }
1213 
1214 library_iterator MachOObjectFile::begin_libraries_needed() const {
1215   // TODO: implement
1216   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1217 }
1218 
1219 library_iterator MachOObjectFile::end_libraries_needed() const {
1220   // TODO: implement
1221   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1222 }
1223 
1224 uint8_t MachOObjectFile::getBytesInAddress() const {
1225   return is64Bit() ? 8 : 4;
1226 }
1227 
1228 StringRef MachOObjectFile::getFileFormatName() const {
1229   unsigned CPUType = getCPUType(this);
1230   if (!is64Bit()) {
1231     switch (CPUType) {
1232     case llvm::MachO::CPUTypeI386:
1233       return "Mach-O 32-bit i386";
1234     case llvm::MachO::CPUTypeARM:
1235       return "Mach-O arm";
1236     case llvm::MachO::CPUTypePowerPC:
1237       return "Mach-O 32-bit ppc";
1238     default:
1239       assert((CPUType & llvm::MachO::CPUArchABI64) == 0 &&
1240              "64-bit object file when we're not 64-bit?");
1241       return "Mach-O 32-bit unknown";
1242     }
1243   }
1244 
1245   // Make sure the cpu type has the correct mask.
1246   assert((CPUType & llvm::MachO::CPUArchABI64)
1247 	 == llvm::MachO::CPUArchABI64 &&
1248 	 "32-bit object file when we're 64-bit?");
1249 
1250   switch (CPUType) {
1251   case llvm::MachO::CPUTypeX86_64:
1252     return "Mach-O 64-bit x86-64";
1253   case llvm::MachO::CPUTypePowerPC64:
1254     return "Mach-O 64-bit ppc64";
1255   default:
1256     return "Mach-O 64-bit unknown";
1257   }
1258 }
1259 
1260 unsigned MachOObjectFile::getArch() const {
1261   switch (getCPUType(this)) {
1262   case llvm::MachO::CPUTypeI386:
1263     return Triple::x86;
1264   case llvm::MachO::CPUTypeX86_64:
1265     return Triple::x86_64;
1266   case llvm::MachO::CPUTypeARM:
1267     return Triple::arm;
1268   case llvm::MachO::CPUTypePowerPC:
1269     return Triple::ppc;
1270   case llvm::MachO::CPUTypePowerPC64:
1271     return Triple::ppc64;
1272   default:
1273     return Triple::UnknownArch;
1274   }
1275 }
1276 
1277 StringRef MachOObjectFile::getLoadName() const {
1278   // TODO: Implement
1279   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1280 }
1281 
1282 StringRef
1283 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1284   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1285   return parseSegmentOrSectionName(Raw.data());
1286 }
1287 
1288 ArrayRef<char>
1289 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1290   const SectionBase *Base =
1291     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1292   return ArrayRef<char>(Base->Name);
1293 }
1294 
1295 ArrayRef<char>
1296 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1297   const SectionBase *Base =
1298     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1299   return ArrayRef<char>(Base->SegmentName);
1300 }
1301 
1302 bool
1303 MachOObjectFile::isRelocationScattered(const macho::RelocationEntry &RE)
1304   const {
1305   if (getCPUType(this) == llvm::MachO::CPUTypeX86_64)
1306     return false;
1307   return getPlainRelocationAddress(RE) & macho::RF_Scattered;
1308 }
1309 
1310 unsigned MachOObjectFile::getPlainRelocationSymbolNum(const macho::RelocationEntry &RE) const {
1311   if (isLittleEndian())
1312     return RE.Word1 & 0xffffff;
1313   return RE.Word1 >> 8;
1314 }
1315 
1316 bool MachOObjectFile::getPlainRelocationExternal(const macho::RelocationEntry &RE) const {
1317   if (isLittleEndian())
1318     return (RE.Word1 >> 27) & 1;
1319   return (RE.Word1 >> 4) & 1;
1320 }
1321 
1322 bool
1323 MachOObjectFile::getScatteredRelocationScattered(const macho::RelocationEntry &RE) const {
1324   return RE.Word0 >> 31;
1325 }
1326 
1327 uint32_t
1328 MachOObjectFile::getScatteredRelocationValue(const macho::RelocationEntry &RE) const {
1329   return RE.Word1;
1330 }
1331 
1332 unsigned
1333 MachOObjectFile::getAnyRelocationAddress(const macho::RelocationEntry &RE) const {
1334   if (isRelocationScattered(RE))
1335     return getScatteredRelocationAddress(RE);
1336   return getPlainRelocationAddress(RE);
1337 }
1338 
1339 unsigned
1340 MachOObjectFile::getAnyRelocationPCRel(const macho::RelocationEntry &RE) const {
1341   if (isRelocationScattered(RE))
1342     return getScatteredRelocationPCRel(this, RE);
1343   return getPlainRelocationPCRel(this, RE);
1344 }
1345 
1346 unsigned
1347 MachOObjectFile::getAnyRelocationLength(const macho::RelocationEntry &RE) const {
1348   if (isRelocationScattered(RE))
1349     return getScatteredRelocationLength(RE);
1350   return getPlainRelocationLength(this, RE);
1351 }
1352 
1353 unsigned
1354 MachOObjectFile::getAnyRelocationType(const macho::RelocationEntry &RE) const {
1355   if (isRelocationScattered(RE))
1356     return getScatteredRelocationType(RE);
1357   return getPlainRelocationType(this, RE);
1358 }
1359 
1360 MachOObjectFile::LoadCommandInfo
1361 MachOObjectFile::getFirstLoadCommandInfo() const {
1362   MachOObjectFile::LoadCommandInfo Load;
1363 
1364   unsigned HeaderSize = is64Bit() ? macho::Header64Size : macho::Header32Size;
1365   Load.Ptr = getPtr(this, HeaderSize);
1366   Load.C = getStruct<macho::LoadCommand>(this, Load.Ptr);
1367   return Load;
1368 }
1369 
1370 MachOObjectFile::LoadCommandInfo
1371 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1372   MachOObjectFile::LoadCommandInfo Next;
1373   Next.Ptr = L.Ptr + L.C.Size;
1374   Next.C = getStruct<macho::LoadCommand>(this, Next.Ptr);
1375   return Next;
1376 }
1377 
1378 macho::Section MachOObjectFile::getSection(DataRefImpl DRI) const {
1379   return getStruct<macho::Section>(this, Sections[DRI.d.a]);
1380 }
1381 
1382 macho::Section64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1383   return getStruct<macho::Section64>(this, Sections[DRI.d.a]);
1384 }
1385 
1386 macho::SymbolTableEntry
1387 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1388   const char *P = getSymbolTableEntryPtr(this, DRI);
1389   return getStruct<macho::SymbolTableEntry>(this, P);
1390 }
1391 
1392 macho::Symbol64TableEntry
1393 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1394   const char *P = getSymbolTableEntryPtr(this, DRI);
1395   return getStruct<macho::Symbol64TableEntry>(this, P);
1396 }
1397 
1398 macho::LinkeditDataLoadCommand
1399 MachOObjectFile::getLinkeditDataLoadCommand(const MachOObjectFile::LoadCommandInfo &L) const {
1400   return getStruct<macho::LinkeditDataLoadCommand>(this, L.Ptr);
1401 }
1402 
1403 macho::RelocationEntry
1404 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1405   const char *P = reinterpret_cast<const char *>(Rel.p);
1406   return getStruct<macho::RelocationEntry>(this, P);
1407 }
1408 
1409 macho::Header MachOObjectFile::getHeader() const {
1410   return getStruct<macho::Header>(this, getPtr(this, 0));
1411 }
1412 
1413 macho::SymtabLoadCommand
1414 MachOObjectFile::getSymtabLoadCommand() const {
1415   return getStruct<macho::SymtabLoadCommand>(this, SymtabLoadCmd);
1416 }
1417 
1418 bool MachOObjectFile::is64Bit() const {
1419   return getType() == getMachOType(false, true) ||
1420     getType() == getMachOType(true, true);
1421 }
1422 
1423 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1424                                    SmallVectorImpl<uint64_t> &Out) const {
1425   DataExtractor extractor(ObjectFile::getData(), true, 0);
1426 
1427   uint32_t offset = Index;
1428   uint64_t data = 0;
1429   while (uint64_t delta = extractor.getULEB128(&offset)) {
1430     data += delta;
1431     Out.push_back(data);
1432   }
1433 }
1434 
1435 ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
1436   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1437   error_code ec;
1438   ObjectFile *Ret;
1439   if (Magic == "\xFE\xED\xFA\xCE")
1440     Ret = new MachOObjectFile(Buffer, false, false, ec);
1441   else if (Magic == "\xCE\xFA\xED\xFE")
1442     Ret = new MachOObjectFile(Buffer, true, false, ec);
1443   else if (Magic == "\xFE\xED\xFA\xCF")
1444     Ret = new MachOObjectFile(Buffer, false, true, ec);
1445   else if (Magic == "\xCF\xFA\xED\xFE")
1446     Ret = new MachOObjectFile(Buffer, true, true, ec);
1447   else
1448     return NULL;
1449 
1450   if (ec)
1451     return NULL;
1452   return Ret;
1453 }
1454 
1455 } // end namespace object
1456 } // end namespace llvm
1457