xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 7e91bc9e324c65b676d8926082edb8b409a6640f) 
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/STLExtras.h"
17 #include "llvm/ADT/Triple.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 "llvm/Support/raw_ostream.h"
23 #include <cctype>
24 #include <cstring>
25 #include <limits>
26 
27 using namespace llvm;
28 using namespace object;
29 
30 namespace llvm {
31 namespace object {
32 
33 struct nlist_base {
34   uint32_t n_strx;
35   uint8_t n_type;
36   uint8_t n_sect;
37   uint16_t n_desc;
38 };
39 
40 struct section_base {
41   char sectname[16];
42   char segname[16];
43 };
44 
45 template<typename T>
46 static void SwapValue(T &Value) {
47   Value = sys::SwapByteOrder(Value);
48 }
49 
50 template<typename T>
51 static void SwapStruct(T &Value);
52 
53 template<>
54 void SwapStruct(MachO::any_relocation_info &H) {
55   SwapValue(H.r_word0);
56   SwapValue(H.r_word1);
57 }
58 
59 template<>
60 void SwapStruct(MachO::load_command &L) {
61   SwapValue(L.cmd);
62   SwapValue(L.cmdsize);
63 }
64 
65 template<>
66 void SwapStruct(nlist_base &S) {
67   SwapValue(S.n_strx);
68   SwapValue(S.n_desc);
69 }
70 
71 template<>
72 void SwapStruct(MachO::section &S) {
73   SwapValue(S.addr);
74   SwapValue(S.size);
75   SwapValue(S.offset);
76   SwapValue(S.align);
77   SwapValue(S.reloff);
78   SwapValue(S.nreloc);
79   SwapValue(S.flags);
80   SwapValue(S.reserved1);
81   SwapValue(S.reserved2);
82 }
83 
84 template<>
85 void SwapStruct(MachO::section_64 &S) {
86   SwapValue(S.addr);
87   SwapValue(S.size);
88   SwapValue(S.offset);
89   SwapValue(S.align);
90   SwapValue(S.reloff);
91   SwapValue(S.nreloc);
92   SwapValue(S.flags);
93   SwapValue(S.reserved1);
94   SwapValue(S.reserved2);
95   SwapValue(S.reserved3);
96 }
97 
98 template<>
99 void SwapStruct(MachO::nlist &S) {
100   SwapValue(S.n_strx);
101   SwapValue(S.n_desc);
102   SwapValue(S.n_value);
103 }
104 
105 template<>
106 void SwapStruct(MachO::nlist_64 &S) {
107   SwapValue(S.n_strx);
108   SwapValue(S.n_desc);
109   SwapValue(S.n_value);
110 }
111 
112 template<>
113 void SwapStruct(MachO::mach_header &H) {
114   SwapValue(H.magic);
115   SwapValue(H.cputype);
116   SwapValue(H.cpusubtype);
117   SwapValue(H.filetype);
118   SwapValue(H.ncmds);
119   SwapValue(H.sizeofcmds);
120   SwapValue(H.flags);
121 }
122 
123 template<>
124 void SwapStruct(MachO::mach_header_64 &H) {
125   SwapValue(H.magic);
126   SwapValue(H.cputype);
127   SwapValue(H.cpusubtype);
128   SwapValue(H.filetype);
129   SwapValue(H.ncmds);
130   SwapValue(H.sizeofcmds);
131   SwapValue(H.flags);
132   SwapValue(H.reserved);
133 }
134 
135 template<>
136 void SwapStruct(MachO::symtab_command &C) {
137   SwapValue(C.cmd);
138   SwapValue(C.cmdsize);
139   SwapValue(C.symoff);
140   SwapValue(C.nsyms);
141   SwapValue(C.stroff);
142   SwapValue(C.strsize);
143 }
144 
145 template<>
146 void SwapStruct(MachO::dysymtab_command &C) {
147   SwapValue(C.cmd);
148   SwapValue(C.cmdsize);
149   SwapValue(C.ilocalsym);
150   SwapValue(C.nlocalsym);
151   SwapValue(C.iextdefsym);
152   SwapValue(C.nextdefsym);
153   SwapValue(C.iundefsym);
154   SwapValue(C.nundefsym);
155   SwapValue(C.tocoff);
156   SwapValue(C.ntoc);
157   SwapValue(C.modtaboff);
158   SwapValue(C.nmodtab);
159   SwapValue(C.extrefsymoff);
160   SwapValue(C.nextrefsyms);
161   SwapValue(C.indirectsymoff);
162   SwapValue(C.nindirectsyms);
163   SwapValue(C.extreloff);
164   SwapValue(C.nextrel);
165   SwapValue(C.locreloff);
166   SwapValue(C.nlocrel);
167 }
168 
169 template<>
170 void SwapStruct(MachO::linkedit_data_command &C) {
171   SwapValue(C.cmd);
172   SwapValue(C.cmdsize);
173   SwapValue(C.dataoff);
174   SwapValue(C.datasize);
175 }
176 
177 template<>
178 void SwapStruct(MachO::segment_command &C) {
179   SwapValue(C.cmd);
180   SwapValue(C.cmdsize);
181   SwapValue(C.vmaddr);
182   SwapValue(C.vmsize);
183   SwapValue(C.fileoff);
184   SwapValue(C.filesize);
185   SwapValue(C.maxprot);
186   SwapValue(C.initprot);
187   SwapValue(C.nsects);
188   SwapValue(C.flags);
189 }
190 
191 template<>
192 void SwapStruct(MachO::segment_command_64 &C) {
193   SwapValue(C.cmd);
194   SwapValue(C.cmdsize);
195   SwapValue(C.vmaddr);
196   SwapValue(C.vmsize);
197   SwapValue(C.fileoff);
198   SwapValue(C.filesize);
199   SwapValue(C.maxprot);
200   SwapValue(C.initprot);
201   SwapValue(C.nsects);
202   SwapValue(C.flags);
203 }
204 
205 template<>
206 void SwapStruct(uint32_t &C) {
207   SwapValue(C);
208 }
209 
210 template<>
211 void SwapStruct(MachO::linker_options_command &C) {
212   SwapValue(C.cmd);
213   SwapValue(C.cmdsize);
214   SwapValue(C.count);
215 }
216 
217 template<>
218 void SwapStruct(MachO::version_min_command&C) {
219   SwapValue(C.cmd);
220   SwapValue(C.cmdsize);
221   SwapValue(C.version);
222   SwapValue(C.reserved);
223 }
224 
225 template<>
226 void SwapStruct(MachO::data_in_code_entry &C) {
227   SwapValue(C.offset);
228   SwapValue(C.length);
229   SwapValue(C.kind);
230 }
231 
232 template<typename T>
233 T getStruct(const MachOObjectFile *O, const char *P) {
234   T Cmd;
235   memcpy(&Cmd, P, sizeof(T));
236   if (O->isLittleEndian() != sys::IsLittleEndianHost)
237     SwapStruct(Cmd);
238   return Cmd;
239 }
240 
241 static uint32_t
242 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
243                                  const MachOObjectFile::LoadCommandInfo &L) {
244   if (O->is64Bit()) {
245     MachO::segment_command_64 S = O->getSegment64LoadCommand(L);
246     return S.nsects;
247   }
248   MachO::segment_command S = O->getSegmentLoadCommand(L);
249   return S.nsects;
250 }
251 
252 static const char *
253 getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
254               unsigned Sec) {
255   uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
256 
257   bool Is64 = O->is64Bit();
258   unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
259                                     sizeof(MachO::segment_command);
260   unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
261                                 sizeof(MachO::section);
262 
263   uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
264   return reinterpret_cast<const char*>(SectionAddr);
265 }
266 
267 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
268   return O->getData().substr(Offset, 1).data();
269 }
270 
271 static nlist_base
272 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
273   const char *P = reinterpret_cast<const char *>(DRI.p);
274   return getStruct<nlist_base>(O, P);
275 }
276 
277 static StringRef parseSegmentOrSectionName(const char *P) {
278   if (P[15] == 0)
279     // Null terminated.
280     return P;
281   // Not null terminated, so this is a 16 char string.
282   return StringRef(P, 16);
283 }
284 
285 // Helper to advance a section or symbol iterator multiple increments at a time.
286 template<class T>
287 static void advance(T &it, size_t Val) {
288   while (Val--)
289     ++it;
290 }
291 
292 static unsigned getCPUType(const MachOObjectFile *O) {
293   return O->getHeader().cputype;
294 }
295 
296 static void printRelocationTargetName(const MachOObjectFile *O,
297                                       const MachO::any_relocation_info &RE,
298                                       raw_string_ostream &fmt) {
299   bool IsScattered = O->isRelocationScattered(RE);
300 
301   // Target of a scattered relocation is an address.  In the interest of
302   // generating pretty output, scan through the symbol table looking for a
303   // symbol that aligns with that address.  If we find one, print it.
304   // Otherwise, we just print the hex address of the target.
305   if (IsScattered) {
306     uint32_t Val = O->getPlainRelocationSymbolNum(RE);
307 
308     for (const SymbolRef &Symbol : O->symbols()) {
309       error_code ec;
310       uint64_t Addr;
311       StringRef Name;
312 
313       if ((ec = Symbol.getAddress(Addr)))
314         report_fatal_error(ec.message());
315       if (Addr != Val)
316         continue;
317       if ((ec = Symbol.getName(Name)))
318         report_fatal_error(ec.message());
319       fmt << Name;
320       return;
321     }
322 
323     // If we couldn't find a symbol that this relocation refers to, try
324     // to find a section beginning instead.
325     for (const SectionRef &Section : O->sections()) {
326       error_code ec;
327       uint64_t Addr;
328       StringRef Name;
329 
330       if ((ec = Section.getAddress(Addr)))
331         report_fatal_error(ec.message());
332       if (Addr != Val)
333         continue;
334       if ((ec = Section.getName(Name)))
335         report_fatal_error(ec.message());
336       fmt << Name;
337       return;
338     }
339 
340     fmt << format("0x%x", Val);
341     return;
342   }
343 
344   StringRef S;
345   bool isExtern = O->getPlainRelocationExternal(RE);
346   uint64_t Val = O->getPlainRelocationSymbolNum(RE);
347 
348   if (isExtern) {
349     symbol_iterator SI = O->symbol_begin();
350     advance(SI, Val);
351     SI->getName(S);
352   } else {
353     section_iterator SI = O->section_begin();
354     // Adjust for the fact that sections are 1-indexed.
355     advance(SI, Val - 1);
356     SI->getName(S);
357   }
358 
359   fmt << S;
360 }
361 
362 static uint32_t
363 getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
364   return RE.r_word0;
365 }
366 
367 static unsigned
368 getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
369   return RE.r_word0 & 0xffffff;
370 }
371 
372 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
373                                     const MachO::any_relocation_info &RE) {
374   if (O->isLittleEndian())
375     return (RE.r_word1 >> 24) & 1;
376   return (RE.r_word1 >> 7) & 1;
377 }
378 
379 static bool
380 getScatteredRelocationPCRel(const MachOObjectFile *O,
381                             const MachO::any_relocation_info &RE) {
382   return (RE.r_word0 >> 30) & 1;
383 }
384 
385 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
386                                          const MachO::any_relocation_info &RE) {
387   if (O->isLittleEndian())
388     return (RE.r_word1 >> 25) & 3;
389   return (RE.r_word1 >> 5) & 3;
390 }
391 
392 static unsigned
393 getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
394   return (RE.r_word0 >> 28) & 3;
395 }
396 
397 static unsigned getPlainRelocationType(const MachOObjectFile *O,
398                                        const MachO::any_relocation_info &RE) {
399   if (O->isLittleEndian())
400     return RE.r_word1 >> 28;
401   return RE.r_word1 & 0xf;
402 }
403 
404 static unsigned
405 getScatteredRelocationType(const MachO::any_relocation_info &RE) {
406   return (RE.r_word0 >> 24) & 0xf;
407 }
408 
409 static uint32_t getSectionFlags(const MachOObjectFile *O,
410                                 DataRefImpl Sec) {
411   if (O->is64Bit()) {
412     MachO::section_64 Sect = O->getSection64(Sec);
413     return Sect.flags;
414   }
415   MachO::section Sect = O->getSection(Sec);
416   return Sect.flags;
417 }
418 
419 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object, bool IsLittleEndian,
420                                  bool Is64bits, error_code &EC,
421                                  bool BufferOwned)
422     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object, BufferOwned),
423       SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
424   uint32_t LoadCommandCount = this->getHeader().ncmds;
425   MachO::LoadCommandType SegmentLoadType = is64Bit() ?
426     MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
427 
428   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
429   for (unsigned I = 0; ; ++I) {
430     if (Load.C.cmd == MachO::LC_SYMTAB) {
431       assert(!SymtabLoadCmd && "Multiple symbol tables");
432       SymtabLoadCmd = Load.Ptr;
433     } else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
434       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
435       DysymtabLoadCmd = Load.Ptr;
436     } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
437       assert(!DataInCodeLoadCmd && "Multiple data in code tables");
438       DataInCodeLoadCmd = Load.Ptr;
439     } else if (Load.C.cmd == SegmentLoadType) {
440       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
441       for (unsigned J = 0; J < NumSections; ++J) {
442         const char *Sec = getSectionPtr(this, Load, J);
443         Sections.push_back(Sec);
444       }
445     }
446 
447     if (I == LoadCommandCount - 1)
448       break;
449     else
450       Load = getNextLoadCommandInfo(Load);
451   }
452 }
453 
454 void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
455   unsigned SymbolTableEntrySize = is64Bit() ?
456     sizeof(MachO::nlist_64) :
457     sizeof(MachO::nlist);
458   Symb.p += SymbolTableEntrySize;
459 }
460 
461 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
462                                           StringRef &Res) const {
463   StringRef StringTable = getStringTableData();
464   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
465   const char *Start = &StringTable.data()[Entry.n_strx];
466   Res = StringRef(Start);
467   return object_error::success;
468 }
469 
470 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
471                                              uint64_t &Res) const {
472   if (is64Bit()) {
473     MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
474     Res = Entry.n_value;
475   } else {
476     MachO::nlist Entry = getSymbolTableEntry(Symb);
477     Res = Entry.n_value;
478   }
479   return object_error::success;
480 }
481 
482 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
483                                                uint32_t &Result) const {
484   uint32_t flags = getSymbolFlags(DRI);
485   if (flags & SymbolRef::SF_Common) {
486     nlist_base Entry = getSymbolTableEntryBase(this, DRI);
487     Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
488   } else {
489     Result = 0;
490   }
491   return object_error::success;
492 }
493 
494 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
495                                           uint64_t &Result) const {
496   uint64_t BeginOffset;
497   uint64_t EndOffset = 0;
498   uint8_t SectionIndex;
499 
500   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
501   uint64_t Value;
502   getSymbolAddress(DRI, Value);
503 
504   BeginOffset = Value;
505 
506   SectionIndex = Entry.n_sect;
507   if (!SectionIndex) {
508     uint32_t flags = getSymbolFlags(DRI);
509     if (flags & SymbolRef::SF_Common)
510       Result = Value;
511     else
512       Result = UnknownAddressOrSize;
513     return object_error::success;
514   }
515   // Unfortunately symbols are unsorted so we need to touch all
516   // symbols from load command
517   for (const SymbolRef &Symbol : symbols()) {
518     DataRefImpl DRI = Symbol.getRawDataRefImpl();
519     Entry = getSymbolTableEntryBase(this, DRI);
520     getSymbolAddress(DRI, Value);
521     if (Entry.n_sect == SectionIndex && Value > BeginOffset)
522       if (!EndOffset || Value < EndOffset)
523         EndOffset = Value;
524   }
525   if (!EndOffset) {
526     uint64_t Size;
527     DataRefImpl Sec;
528     Sec.d.a = SectionIndex-1;
529     getSectionSize(Sec, Size);
530     getSectionAddress(Sec, EndOffset);
531     EndOffset += Size;
532   }
533   Result = EndOffset - BeginOffset;
534   return object_error::success;
535 }
536 
537 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
538                                           SymbolRef::Type &Res) const {
539   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
540   uint8_t n_type = Entry.n_type;
541 
542   Res = SymbolRef::ST_Other;
543 
544   // If this is a STAB debugging symbol, we can do nothing more.
545   if (n_type & MachO::N_STAB) {
546     Res = SymbolRef::ST_Debug;
547     return object_error::success;
548   }
549 
550   switch (n_type & MachO::N_TYPE) {
551     case MachO::N_UNDF :
552       Res = SymbolRef::ST_Unknown;
553       break;
554     case MachO::N_SECT :
555       Res = SymbolRef::ST_Function;
556       break;
557   }
558   return object_error::success;
559 }
560 
561 uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
562   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
563 
564   uint8_t MachOType = Entry.n_type;
565   uint16_t MachOFlags = Entry.n_desc;
566 
567   uint32_t Result = SymbolRef::SF_None;
568 
569   if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
570     Result |= SymbolRef::SF_Undefined;
571 
572   if (MachOType & MachO::N_STAB)
573     Result |= SymbolRef::SF_FormatSpecific;
574 
575   if (MachOType & MachO::N_EXT) {
576     Result |= SymbolRef::SF_Global;
577     if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
578       uint64_t Value;
579       getSymbolAddress(DRI, Value);
580       if (Value)
581         Result |= SymbolRef::SF_Common;
582     }
583   }
584 
585   if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
586     Result |= SymbolRef::SF_Weak;
587 
588   if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
589     Result |= SymbolRef::SF_Absolute;
590 
591   return Result;
592 }
593 
594 error_code
595 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
596                                   section_iterator &Res) const {
597   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
598   uint8_t index = Entry.n_sect;
599 
600   if (index == 0) {
601     Res = section_end();
602   } else {
603     DataRefImpl DRI;
604     DRI.d.a = index - 1;
605     Res = section_iterator(SectionRef(DRI, this));
606   }
607 
608   return object_error::success;
609 }
610 
611 void MachOObjectFile::moveSectionNext(DataRefImpl &Sec) const {
612   Sec.d.a++;
613 }
614 
615 error_code
616 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
617   ArrayRef<char> Raw = getSectionRawName(Sec);
618   Result = parseSegmentOrSectionName(Raw.data());
619   return object_error::success;
620 }
621 
622 error_code
623 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
624   if (is64Bit()) {
625     MachO::section_64 Sect = getSection64(Sec);
626     Res = Sect.addr;
627   } else {
628     MachO::section Sect = getSection(Sec);
629     Res = Sect.addr;
630   }
631   return object_error::success;
632 }
633 
634 error_code
635 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
636   if (is64Bit()) {
637     MachO::section_64 Sect = getSection64(Sec);
638     Res = Sect.size;
639   } else {
640     MachO::section Sect = getSection(Sec);
641     Res = Sect.size;
642   }
643 
644   return object_error::success;
645 }
646 
647 error_code
648 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
649   uint32_t Offset;
650   uint64_t Size;
651 
652   if (is64Bit()) {
653     MachO::section_64 Sect = getSection64(Sec);
654     Offset = Sect.offset;
655     Size = Sect.size;
656   } else {
657     MachO::section Sect = getSection(Sec);
658     Offset = Sect.offset;
659     Size = Sect.size;
660   }
661 
662   Res = this->getData().substr(Offset, Size);
663   return object_error::success;
664 }
665 
666 error_code
667 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
668   uint32_t Align;
669   if (is64Bit()) {
670     MachO::section_64 Sect = getSection64(Sec);
671     Align = Sect.align;
672   } else {
673     MachO::section Sect = getSection(Sec);
674     Align = Sect.align;
675   }
676 
677   Res = uint64_t(1) << Align;
678   return object_error::success;
679 }
680 
681 error_code
682 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
683   uint32_t Flags = getSectionFlags(this, Sec);
684   Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
685   return object_error::success;
686 }
687 
688 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
689   // FIXME: Unimplemented.
690   Result = false;
691   return object_error::success;
692 }
693 
694 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
695   // FIXME: Unimplemented.
696   Result = false;
697   return object_error::success;
698 }
699 
700 error_code
701 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
702                                                bool &Result) const {
703   // FIXME: Unimplemented.
704   Result = true;
705   return object_error::success;
706 }
707 
708 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
709                                              bool &Result) const {
710   // FIXME: Unimplemented.
711   Result = false;
712   return object_error::success;
713 }
714 
715 error_code
716 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
717   uint32_t Flags = getSectionFlags(this, Sec);
718   unsigned SectionType = Flags & MachO::SECTION_TYPE;
719   Res = SectionType == MachO::S_ZEROFILL ||
720     SectionType == MachO::S_GB_ZEROFILL;
721   return object_error::success;
722 }
723 
724 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
725                                                   bool &Result) const {
726   // Consider using the code from isSectionText to look for __const sections.
727   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
728   // to use section attributes to distinguish code from data.
729 
730   // FIXME: Unimplemented.
731   Result = false;
732   return object_error::success;
733 }
734 
735 error_code
736 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
737                                        bool &Result) const {
738   SymbolRef::Type ST;
739   this->getSymbolType(Symb, ST);
740   if (ST == SymbolRef::ST_Unknown) {
741     Result = false;
742     return object_error::success;
743   }
744 
745   uint64_t SectBegin, SectEnd;
746   getSectionAddress(Sec, SectBegin);
747   getSectionSize(Sec, SectEnd);
748   SectEnd += SectBegin;
749 
750   uint64_t SymAddr;
751   getSymbolAddress(Symb, SymAddr);
752   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
753 
754   return object_error::success;
755 }
756 
757 relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
758   DataRefImpl Ret;
759   Ret.d.a = Sec.d.a;
760   Ret.d.b = 0;
761   return relocation_iterator(RelocationRef(Ret, this));
762 }
763 
764 relocation_iterator
765 MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
766   uint32_t Num;
767   if (is64Bit()) {
768     MachO::section_64 Sect = getSection64(Sec);
769     Num = Sect.nreloc;
770   } else {
771     MachO::section Sect = getSection(Sec);
772     Num = Sect.nreloc;
773   }
774 
775   DataRefImpl Ret;
776   Ret.d.a = Sec.d.a;
777   Ret.d.b = Num;
778   return relocation_iterator(RelocationRef(Ret, this));
779 }
780 
781 void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
782   ++Rel.d.b;
783 }
784 
785 error_code
786 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
787   MachO::any_relocation_info RE = getRelocation(Rel);
788   uint64_t Offset = getAnyRelocationAddress(RE);
789 
790   DataRefImpl Sec;
791   Sec.d.a = Rel.d.a;
792   uint64_t SecAddress;
793   getSectionAddress(Sec, SecAddress);
794   Res = SecAddress + Offset;
795   return object_error::success;
796 }
797 
798 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
799                                                 uint64_t &Res) const {
800   MachO::any_relocation_info RE = getRelocation(Rel);
801   Res = getAnyRelocationAddress(RE);
802   return object_error::success;
803 }
804 
805 symbol_iterator
806 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
807   MachO::any_relocation_info RE = getRelocation(Rel);
808   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
809   bool isExtern = getPlainRelocationExternal(RE);
810   if (!isExtern)
811     return symbol_end();
812 
813   MachO::symtab_command S = getSymtabLoadCommand();
814   unsigned SymbolTableEntrySize = is64Bit() ?
815     sizeof(MachO::nlist_64) :
816     sizeof(MachO::nlist);
817   uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
818   DataRefImpl Sym;
819   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
820   return symbol_iterator(SymbolRef(Sym, this));
821 }
822 
823 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
824                                               uint64_t &Res) const {
825   MachO::any_relocation_info RE = getRelocation(Rel);
826   Res = getAnyRelocationType(RE);
827   return object_error::success;
828 }
829 
830 error_code
831 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
832                                        SmallVectorImpl<char> &Result) const {
833   StringRef res;
834   uint64_t RType;
835   getRelocationType(Rel, RType);
836 
837   unsigned Arch = this->getArch();
838 
839   switch (Arch) {
840     case Triple::x86: {
841       static const char *const Table[] =  {
842         "GENERIC_RELOC_VANILLA",
843         "GENERIC_RELOC_PAIR",
844         "GENERIC_RELOC_SECTDIFF",
845         "GENERIC_RELOC_PB_LA_PTR",
846         "GENERIC_RELOC_LOCAL_SECTDIFF",
847         "GENERIC_RELOC_TLV" };
848 
849       if (RType > 5)
850         res = "Unknown";
851       else
852         res = Table[RType];
853       break;
854     }
855     case Triple::x86_64: {
856       static const char *const Table[] =  {
857         "X86_64_RELOC_UNSIGNED",
858         "X86_64_RELOC_SIGNED",
859         "X86_64_RELOC_BRANCH",
860         "X86_64_RELOC_GOT_LOAD",
861         "X86_64_RELOC_GOT",
862         "X86_64_RELOC_SUBTRACTOR",
863         "X86_64_RELOC_SIGNED_1",
864         "X86_64_RELOC_SIGNED_2",
865         "X86_64_RELOC_SIGNED_4",
866         "X86_64_RELOC_TLV" };
867 
868       if (RType > 9)
869         res = "Unknown";
870       else
871         res = Table[RType];
872       break;
873     }
874     case Triple::arm: {
875       static const char *const Table[] =  {
876         "ARM_RELOC_VANILLA",
877         "ARM_RELOC_PAIR",
878         "ARM_RELOC_SECTDIFF",
879         "ARM_RELOC_LOCAL_SECTDIFF",
880         "ARM_RELOC_PB_LA_PTR",
881         "ARM_RELOC_BR24",
882         "ARM_THUMB_RELOC_BR22",
883         "ARM_THUMB_32BIT_BRANCH",
884         "ARM_RELOC_HALF",
885         "ARM_RELOC_HALF_SECTDIFF" };
886 
887       if (RType > 9)
888         res = "Unknown";
889       else
890         res = Table[RType];
891       break;
892     }
893     case Triple::arm64:
894     case Triple::aarch64: {
895       static const char *const Table[] = {
896         "ARM64_RELOC_UNSIGNED",           "ARM64_RELOC_SUBTRACTOR",
897         "ARM64_RELOC_BRANCH26",           "ARM64_RELOC_PAGE21",
898         "ARM64_RELOC_PAGEOFF12",          "ARM64_RELOC_GOT_LOAD_PAGE21",
899         "ARM64_RELOC_GOT_LOAD_PAGEOFF12", "ARM64_RELOC_POINTER_TO_GOT",
900         "ARM64_RELOC_TLVP_LOAD_PAGE21",   "ARM64_RELOC_TLVP_LOAD_PAGEOFF12",
901         "ARM64_RELOC_ADDEND"
902       };
903 
904       if (RType >= array_lengthof(Table))
905         res = "Unknown";
906       else
907         res = Table[RType];
908       break;
909     }
910     case Triple::ppc: {
911       static const char *const Table[] =  {
912         "PPC_RELOC_VANILLA",
913         "PPC_RELOC_PAIR",
914         "PPC_RELOC_BR14",
915         "PPC_RELOC_BR24",
916         "PPC_RELOC_HI16",
917         "PPC_RELOC_LO16",
918         "PPC_RELOC_HA16",
919         "PPC_RELOC_LO14",
920         "PPC_RELOC_SECTDIFF",
921         "PPC_RELOC_PB_LA_PTR",
922         "PPC_RELOC_HI16_SECTDIFF",
923         "PPC_RELOC_LO16_SECTDIFF",
924         "PPC_RELOC_HA16_SECTDIFF",
925         "PPC_RELOC_JBSR",
926         "PPC_RELOC_LO14_SECTDIFF",
927         "PPC_RELOC_LOCAL_SECTDIFF" };
928 
929       if (RType > 15)
930         res = "Unknown";
931       else
932         res = Table[RType];
933       break;
934     }
935     case Triple::UnknownArch:
936       res = "Unknown";
937       break;
938   }
939   Result.append(res.begin(), res.end());
940   return object_error::success;
941 }
942 
943 error_code
944 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
945                                           SmallVectorImpl<char> &Result) const {
946   MachO::any_relocation_info RE = getRelocation(Rel);
947 
948   unsigned Arch = this->getArch();
949 
950   std::string fmtbuf;
951   raw_string_ostream fmt(fmtbuf);
952   unsigned Type = this->getAnyRelocationType(RE);
953   bool IsPCRel = this->getAnyRelocationPCRel(RE);
954 
955   // Determine any addends that should be displayed with the relocation.
956   // These require decoding the relocation type, which is triple-specific.
957 
958   // X86_64 has entirely custom relocation types.
959   if (Arch == Triple::x86_64) {
960     bool isPCRel = getAnyRelocationPCRel(RE);
961 
962     switch (Type) {
963       case MachO::X86_64_RELOC_GOT_LOAD:
964       case MachO::X86_64_RELOC_GOT: {
965         printRelocationTargetName(this, RE, fmt);
966         fmt << "@GOT";
967         if (isPCRel) fmt << "PCREL";
968         break;
969       }
970       case MachO::X86_64_RELOC_SUBTRACTOR: {
971         DataRefImpl RelNext = Rel;
972         moveRelocationNext(RelNext);
973         MachO::any_relocation_info RENext = getRelocation(RelNext);
974 
975         // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
976         // X86_64_RELOC_UNSIGNED.
977         // NOTE: Scattered relocations don't exist on x86_64.
978         unsigned RType = getAnyRelocationType(RENext);
979         if (RType != MachO::X86_64_RELOC_UNSIGNED)
980           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
981                              "X86_64_RELOC_SUBTRACTOR.");
982 
983         // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
984         // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
985         printRelocationTargetName(this, RENext, fmt);
986         fmt << "-";
987         printRelocationTargetName(this, RE, fmt);
988         break;
989       }
990       case MachO::X86_64_RELOC_TLV:
991         printRelocationTargetName(this, RE, fmt);
992         fmt << "@TLV";
993         if (isPCRel) fmt << "P";
994         break;
995       case MachO::X86_64_RELOC_SIGNED_1:
996         printRelocationTargetName(this, RE, fmt);
997         fmt << "-1";
998         break;
999       case MachO::X86_64_RELOC_SIGNED_2:
1000         printRelocationTargetName(this, RE, fmt);
1001         fmt << "-2";
1002         break;
1003       case MachO::X86_64_RELOC_SIGNED_4:
1004         printRelocationTargetName(this, RE, fmt);
1005         fmt << "-4";
1006         break;
1007       default:
1008         printRelocationTargetName(this, RE, fmt);
1009         break;
1010     }
1011   // X86 and ARM share some relocation types in common.
1012   } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1013              Arch == Triple::ppc) {
1014     // Generic relocation types...
1015     switch (Type) {
1016       case MachO::GENERIC_RELOC_PAIR: // prints no info
1017         return object_error::success;
1018       case MachO::GENERIC_RELOC_SECTDIFF: {
1019         DataRefImpl RelNext = Rel;
1020         moveRelocationNext(RelNext);
1021         MachO::any_relocation_info RENext = getRelocation(RelNext);
1022 
1023         // X86 sect diff's must be followed by a relocation of type
1024         // GENERIC_RELOC_PAIR.
1025         unsigned RType = getAnyRelocationType(RENext);
1026 
1027         if (RType != MachO::GENERIC_RELOC_PAIR)
1028           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1029                              "GENERIC_RELOC_SECTDIFF.");
1030 
1031         printRelocationTargetName(this, RE, fmt);
1032         fmt << "-";
1033         printRelocationTargetName(this, RENext, fmt);
1034         break;
1035       }
1036     }
1037 
1038     if (Arch == Triple::x86 || Arch == Triple::ppc) {
1039       switch (Type) {
1040         case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
1041           DataRefImpl RelNext = Rel;
1042           moveRelocationNext(RelNext);
1043           MachO::any_relocation_info RENext = getRelocation(RelNext);
1044 
1045           // X86 sect diff's must be followed by a relocation of type
1046           // GENERIC_RELOC_PAIR.
1047           unsigned RType = getAnyRelocationType(RENext);
1048           if (RType != MachO::GENERIC_RELOC_PAIR)
1049             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1050                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1051 
1052           printRelocationTargetName(this, RE, fmt);
1053           fmt << "-";
1054           printRelocationTargetName(this, RENext, fmt);
1055           break;
1056         }
1057         case MachO::GENERIC_RELOC_TLV: {
1058           printRelocationTargetName(this, RE, fmt);
1059           fmt << "@TLV";
1060           if (IsPCRel) fmt << "P";
1061           break;
1062         }
1063         default:
1064           printRelocationTargetName(this, RE, fmt);
1065       }
1066     } else { // ARM-specific relocations
1067       switch (Type) {
1068         case MachO::ARM_RELOC_HALF:
1069         case MachO::ARM_RELOC_HALF_SECTDIFF: {
1070           // Half relocations steal a bit from the length field to encode
1071           // whether this is an upper16 or a lower16 relocation.
1072           bool isUpper = getAnyRelocationLength(RE) >> 1;
1073 
1074           if (isUpper)
1075             fmt << ":upper16:(";
1076           else
1077             fmt << ":lower16:(";
1078           printRelocationTargetName(this, RE, fmt);
1079 
1080           DataRefImpl RelNext = Rel;
1081           moveRelocationNext(RelNext);
1082           MachO::any_relocation_info RENext = getRelocation(RelNext);
1083 
1084           // ARM half relocs must be followed by a relocation of type
1085           // ARM_RELOC_PAIR.
1086           unsigned RType = getAnyRelocationType(RENext);
1087           if (RType != MachO::ARM_RELOC_PAIR)
1088             report_fatal_error("Expected ARM_RELOC_PAIR after "
1089                                "ARM_RELOC_HALF");
1090 
1091           // NOTE: The half of the target virtual address is stashed in the
1092           // address field of the secondary relocation, but we can't reverse
1093           // engineer the constant offset from it without decoding the movw/movt
1094           // instruction to find the other half in its immediate field.
1095 
1096           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1097           // symbol/section pointer of the follow-on relocation.
1098           if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
1099             fmt << "-";
1100             printRelocationTargetName(this, RENext, fmt);
1101           }
1102 
1103           fmt << ")";
1104           break;
1105         }
1106         default: {
1107           printRelocationTargetName(this, RE, fmt);
1108         }
1109       }
1110     }
1111   } else
1112     printRelocationTargetName(this, RE, fmt);
1113 
1114   fmt.flush();
1115   Result.append(fmtbuf.begin(), fmtbuf.end());
1116   return object_error::success;
1117 }
1118 
1119 error_code
1120 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1121   unsigned Arch = getArch();
1122   uint64_t Type;
1123   getRelocationType(Rel, Type);
1124 
1125   Result = false;
1126 
1127   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1128   // is always hidden.
1129   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1130     if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
1131   } else if (Arch == Triple::x86_64) {
1132     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1133     // an X86_64_RELOC_SUBTRACTOR.
1134     if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
1135       DataRefImpl RelPrev = Rel;
1136       RelPrev.d.a--;
1137       uint64_t PrevType;
1138       getRelocationType(RelPrev, PrevType);
1139       if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
1140         Result = true;
1141     }
1142   }
1143 
1144   return object_error::success;
1145 }
1146 
1147 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1148                                            LibraryRef &Res) const {
1149   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1150 }
1151 
1152 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1153                                            StringRef &Res) const {
1154   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1155 }
1156 
1157 basic_symbol_iterator MachOObjectFile::symbol_begin_impl() const {
1158   DataRefImpl DRI;
1159   if (!SymtabLoadCmd)
1160     return basic_symbol_iterator(SymbolRef(DRI, this));
1161 
1162   MachO::symtab_command Symtab = getSymtabLoadCommand();
1163   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
1164   return basic_symbol_iterator(SymbolRef(DRI, this));
1165 }
1166 
1167 basic_symbol_iterator MachOObjectFile::symbol_end_impl() const {
1168   DataRefImpl DRI;
1169   if (!SymtabLoadCmd)
1170     return basic_symbol_iterator(SymbolRef(DRI, this));
1171 
1172   MachO::symtab_command Symtab = getSymtabLoadCommand();
1173   unsigned SymbolTableEntrySize = is64Bit() ?
1174     sizeof(MachO::nlist_64) :
1175     sizeof(MachO::nlist);
1176   unsigned Offset = Symtab.symoff +
1177     Symtab.nsyms * SymbolTableEntrySize;
1178   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1179   return basic_symbol_iterator(SymbolRef(DRI, this));
1180 }
1181 
1182 section_iterator MachOObjectFile::section_begin() const {
1183   DataRefImpl DRI;
1184   return section_iterator(SectionRef(DRI, this));
1185 }
1186 
1187 section_iterator MachOObjectFile::section_end() const {
1188   DataRefImpl DRI;
1189   DRI.d.a = Sections.size();
1190   return section_iterator(SectionRef(DRI, this));
1191 }
1192 
1193 library_iterator MachOObjectFile::needed_library_begin() const {
1194   // TODO: implement
1195   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1196 }
1197 
1198 library_iterator MachOObjectFile::needed_library_end() const {
1199   // TODO: implement
1200   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1201 }
1202 
1203 uint8_t MachOObjectFile::getBytesInAddress() const {
1204   return is64Bit() ? 8 : 4;
1205 }
1206 
1207 StringRef MachOObjectFile::getFileFormatName() const {
1208   unsigned CPUType = getCPUType(this);
1209   if (!is64Bit()) {
1210     switch (CPUType) {
1211     case llvm::MachO::CPU_TYPE_I386:
1212       return "Mach-O 32-bit i386";
1213     case llvm::MachO::CPU_TYPE_ARM:
1214       return "Mach-O arm";
1215     case llvm::MachO::CPU_TYPE_POWERPC:
1216       return "Mach-O 32-bit ppc";
1217     default:
1218       assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
1219              "64-bit object file when we're not 64-bit?");
1220       return "Mach-O 32-bit unknown";
1221     }
1222   }
1223 
1224   // Make sure the cpu type has the correct mask.
1225   assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
1226          == llvm::MachO::CPU_ARCH_ABI64 &&
1227          "32-bit object file when we're 64-bit?");
1228 
1229   switch (CPUType) {
1230   case llvm::MachO::CPU_TYPE_X86_64:
1231     return "Mach-O 64-bit x86-64";
1232   case llvm::MachO::CPU_TYPE_ARM64:
1233     return "Mach-O arm64";
1234   case llvm::MachO::CPU_TYPE_POWERPC64:
1235     return "Mach-O 64-bit ppc64";
1236   default:
1237     return "Mach-O 64-bit unknown";
1238   }
1239 }
1240 
1241 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1242   switch (CPUType) {
1243   case llvm::MachO::CPU_TYPE_I386:
1244     return Triple::x86;
1245   case llvm::MachO::CPU_TYPE_X86_64:
1246     return Triple::x86_64;
1247   case llvm::MachO::CPU_TYPE_ARM:
1248     return Triple::arm;
1249   case llvm::MachO::CPU_TYPE_ARM64:
1250     return Triple::arm64;
1251   case llvm::MachO::CPU_TYPE_POWERPC:
1252     return Triple::ppc;
1253   case llvm::MachO::CPU_TYPE_POWERPC64:
1254     return Triple::ppc64;
1255   default:
1256     return Triple::UnknownArch;
1257   }
1258 }
1259 
1260 unsigned MachOObjectFile::getArch() const {
1261   return getArch(getCPUType(this));
1262 }
1263 
1264 StringRef MachOObjectFile::getLoadName() const {
1265   // TODO: Implement
1266   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1267 }
1268 
1269 relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
1270   DataRefImpl DRI;
1271   DRI.d.a = Index;
1272   return section_rel_begin(DRI);
1273 }
1274 
1275 relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
1276   DataRefImpl DRI;
1277   DRI.d.a = Index;
1278   return section_rel_end(DRI);
1279 }
1280 
1281 dice_iterator MachOObjectFile::begin_dices() const {
1282   DataRefImpl DRI;
1283   if (!DataInCodeLoadCmd)
1284     return dice_iterator(DiceRef(DRI, this));
1285 
1286   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1287   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
1288   return dice_iterator(DiceRef(DRI, this));
1289 }
1290 
1291 dice_iterator MachOObjectFile::end_dices() const {
1292   DataRefImpl DRI;
1293   if (!DataInCodeLoadCmd)
1294     return dice_iterator(DiceRef(DRI, this));
1295 
1296   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1297   unsigned Offset = DicLC.dataoff + DicLC.datasize;
1298   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1299   return dice_iterator(DiceRef(DRI, this));
1300 }
1301 
1302 StringRef
1303 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1304   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1305   return parseSegmentOrSectionName(Raw.data());
1306 }
1307 
1308 ArrayRef<char>
1309 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1310   const section_base *Base =
1311     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1312   return ArrayRef<char>(Base->sectname);
1313 }
1314 
1315 ArrayRef<char>
1316 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1317   const section_base *Base =
1318     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1319   return ArrayRef<char>(Base->segname);
1320 }
1321 
1322 bool
1323 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
1324   const {
1325   if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
1326     return false;
1327   return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
1328 }
1329 
1330 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1331     const MachO::any_relocation_info &RE) const {
1332   if (isLittleEndian())
1333     return RE.r_word1 & 0xffffff;
1334   return RE.r_word1 >> 8;
1335 }
1336 
1337 bool MachOObjectFile::getPlainRelocationExternal(
1338     const MachO::any_relocation_info &RE) const {
1339   if (isLittleEndian())
1340     return (RE.r_word1 >> 27) & 1;
1341   return (RE.r_word1 >> 4) & 1;
1342 }
1343 
1344 bool MachOObjectFile::getScatteredRelocationScattered(
1345     const MachO::any_relocation_info &RE) const {
1346   return RE.r_word0 >> 31;
1347 }
1348 
1349 uint32_t MachOObjectFile::getScatteredRelocationValue(
1350     const MachO::any_relocation_info &RE) const {
1351   return RE.r_word1;
1352 }
1353 
1354 unsigned MachOObjectFile::getAnyRelocationAddress(
1355     const MachO::any_relocation_info &RE) const {
1356   if (isRelocationScattered(RE))
1357     return getScatteredRelocationAddress(RE);
1358   return getPlainRelocationAddress(RE);
1359 }
1360 
1361 unsigned MachOObjectFile::getAnyRelocationPCRel(
1362     const MachO::any_relocation_info &RE) const {
1363   if (isRelocationScattered(RE))
1364     return getScatteredRelocationPCRel(this, RE);
1365   return getPlainRelocationPCRel(this, RE);
1366 }
1367 
1368 unsigned MachOObjectFile::getAnyRelocationLength(
1369     const MachO::any_relocation_info &RE) const {
1370   if (isRelocationScattered(RE))
1371     return getScatteredRelocationLength(RE);
1372   return getPlainRelocationLength(this, RE);
1373 }
1374 
1375 unsigned
1376 MachOObjectFile::getAnyRelocationType(
1377                                    const MachO::any_relocation_info &RE) const {
1378   if (isRelocationScattered(RE))
1379     return getScatteredRelocationType(RE);
1380   return getPlainRelocationType(this, RE);
1381 }
1382 
1383 SectionRef
1384 MachOObjectFile::getRelocationSection(
1385                                    const MachO::any_relocation_info &RE) const {
1386   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1387     return *section_end();
1388   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1389   DataRefImpl DRI;
1390   DRI.d.a = SecNum;
1391   return SectionRef(DRI, this);
1392 }
1393 
1394 MachOObjectFile::LoadCommandInfo
1395 MachOObjectFile::getFirstLoadCommandInfo() const {
1396   MachOObjectFile::LoadCommandInfo Load;
1397 
1398   unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
1399                                     sizeof(MachO::mach_header);
1400   Load.Ptr = getPtr(this, HeaderSize);
1401   Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
1402   return Load;
1403 }
1404 
1405 MachOObjectFile::LoadCommandInfo
1406 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1407   MachOObjectFile::LoadCommandInfo Next;
1408   Next.Ptr = L.Ptr + L.C.cmdsize;
1409   Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
1410   return Next;
1411 }
1412 
1413 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
1414   return getStruct<MachO::section>(this, Sections[DRI.d.a]);
1415 }
1416 
1417 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1418   return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
1419 }
1420 
1421 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
1422                                            unsigned Index) const {
1423   const char *Sec = getSectionPtr(this, L, Index);
1424   return getStruct<MachO::section>(this, Sec);
1425 }
1426 
1427 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1428                                                 unsigned Index) const {
1429   const char *Sec = getSectionPtr(this, L, Index);
1430   return getStruct<MachO::section_64>(this, Sec);
1431 }
1432 
1433 MachO::nlist
1434 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1435   const char *P = reinterpret_cast<const char *>(DRI.p);
1436   return getStruct<MachO::nlist>(this, P);
1437 }
1438 
1439 MachO::nlist_64
1440 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1441   const char *P = reinterpret_cast<const char *>(DRI.p);
1442   return getStruct<MachO::nlist_64>(this, P);
1443 }
1444 
1445 MachO::linkedit_data_command
1446 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
1447   return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
1448 }
1449 
1450 MachO::segment_command
1451 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1452   return getStruct<MachO::segment_command>(this, L.Ptr);
1453 }
1454 
1455 MachO::segment_command_64
1456 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1457   return getStruct<MachO::segment_command_64>(this, L.Ptr);
1458 }
1459 
1460 MachO::linker_options_command
1461 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1462   return getStruct<MachO::linker_options_command>(this, L.Ptr);
1463 }
1464 
1465 MachO::version_min_command
1466 MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const {
1467   return getStruct<MachO::version_min_command>(this, L.Ptr);
1468 }
1469 
1470 MachO::any_relocation_info
1471 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1472   DataRefImpl Sec;
1473   Sec.d.a = Rel.d.a;
1474   uint32_t Offset;
1475   if (is64Bit()) {
1476     MachO::section_64 Sect = getSection64(Sec);
1477     Offset = Sect.reloff;
1478   } else {
1479     MachO::section Sect = getSection(Sec);
1480     Offset = Sect.reloff;
1481   }
1482 
1483   auto P = reinterpret_cast<const MachO::any_relocation_info *>(
1484       getPtr(this, Offset)) + Rel.d.b;
1485   return getStruct<MachO::any_relocation_info>(
1486       this, reinterpret_cast<const char *>(P));
1487 }
1488 
1489 MachO::data_in_code_entry
1490 MachOObjectFile::getDice(DataRefImpl Rel) const {
1491   const char *P = reinterpret_cast<const char *>(Rel.p);
1492   return getStruct<MachO::data_in_code_entry>(this, P);
1493 }
1494 
1495 MachO::mach_header MachOObjectFile::getHeader() const {
1496   return getStruct<MachO::mach_header>(this, getPtr(this, 0));
1497 }
1498 
1499 MachO::mach_header_64 MachOObjectFile::getHeader64() const {
1500   return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
1501 }
1502 
1503 uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
1504                                              const MachO::dysymtab_command &DLC,
1505                                              unsigned Index) const {
1506   uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
1507   return getStruct<uint32_t>(this, getPtr(this, Offset));
1508 }
1509 
1510 MachO::data_in_code_entry
1511 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1512                                          unsigned Index) const {
1513   uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
1514   return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
1515 }
1516 
1517 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
1518   return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
1519 }
1520 
1521 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
1522   return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
1523 }
1524 
1525 MachO::linkedit_data_command
1526 MachOObjectFile::getDataInCodeLoadCommand() const {
1527   if (DataInCodeLoadCmd)
1528     return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
1529 
1530   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1531   MachO::linkedit_data_command Cmd;
1532   Cmd.cmd = MachO::LC_DATA_IN_CODE;
1533   Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
1534   Cmd.dataoff = 0;
1535   Cmd.datasize = 0;
1536   return Cmd;
1537 }
1538 
1539 StringRef MachOObjectFile::getStringTableData() const {
1540   MachO::symtab_command S = getSymtabLoadCommand();
1541   return getData().substr(S.stroff, S.strsize);
1542 }
1543 
1544 bool MachOObjectFile::is64Bit() const {
1545   return getType() == getMachOType(false, true) ||
1546     getType() == getMachOType(true, true);
1547 }
1548 
1549 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1550                                    SmallVectorImpl<uint64_t> &Out) const {
1551   DataExtractor extractor(ObjectFile::getData(), true, 0);
1552 
1553   uint32_t offset = Index;
1554   uint64_t data = 0;
1555   while (uint64_t delta = extractor.getULEB128(&offset)) {
1556     data += delta;
1557     Out.push_back(data);
1558   }
1559 }
1560 
1561 ErrorOr<ObjectFile *> ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer,
1562                                                         bool BufferOwned) {
1563   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1564   error_code EC;
1565   std::unique_ptr<MachOObjectFile> Ret;
1566   if (Magic == "\xFE\xED\xFA\xCE")
1567     Ret.reset(new MachOObjectFile(Buffer, false, false, EC, BufferOwned));
1568   else if (Magic == "\xCE\xFA\xED\xFE")
1569     Ret.reset(new MachOObjectFile(Buffer, true, false, EC, BufferOwned));
1570   else if (Magic == "\xFE\xED\xFA\xCF")
1571     Ret.reset(new MachOObjectFile(Buffer, false, true, EC, BufferOwned));
1572   else if (Magic == "\xCF\xFA\xED\xFE")
1573     Ret.reset(new MachOObjectFile(Buffer, true, true, EC, BufferOwned));
1574   else {
1575     delete Buffer;
1576     return object_error::parse_failed;
1577   }
1578 
1579   if (EC)
1580     return EC;
1581   return Ret.release();
1582 }
1583 
1584 } // end namespace object
1585 } // end namespace llvm
1586