xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 1b985af0ba97dcc51adfd384611a329c8d86954b) 
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(nullptr), DysymtabLoadCmd(nullptr),
424       DataInCodeLoadCmd(nullptr) {
425   uint32_t LoadCommandCount = this->getHeader().ncmds;
426   MachO::LoadCommandType SegmentLoadType = is64Bit() ?
427     MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
428 
429   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
430   for (unsigned I = 0; ; ++I) {
431     if (Load.C.cmd == MachO::LC_SYMTAB) {
432       assert(!SymtabLoadCmd && "Multiple symbol tables");
433       SymtabLoadCmd = Load.Ptr;
434     } else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
435       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
436       DysymtabLoadCmd = Load.Ptr;
437     } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
438       assert(!DataInCodeLoadCmd && "Multiple data in code tables");
439       DataInCodeLoadCmd = Load.Ptr;
440     } else if (Load.C.cmd == SegmentLoadType) {
441       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
442       for (unsigned J = 0; J < NumSections; ++J) {
443         const char *Sec = getSectionPtr(this, Load, J);
444         Sections.push_back(Sec);
445       }
446     }
447 
448     if (I == LoadCommandCount - 1)
449       break;
450     else
451       Load = getNextLoadCommandInfo(Load);
452   }
453 }
454 
455 void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
456   unsigned SymbolTableEntrySize = is64Bit() ?
457     sizeof(MachO::nlist_64) :
458     sizeof(MachO::nlist);
459   Symb.p += SymbolTableEntrySize;
460 }
461 
462 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
463                                           StringRef &Res) const {
464   StringRef StringTable = getStringTableData();
465   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
466   const char *Start = &StringTable.data()[Entry.n_strx];
467   Res = StringRef(Start);
468   return object_error::success;
469 }
470 
471 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
472                                              uint64_t &Res) const {
473   if (is64Bit()) {
474     MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
475     if ((Entry.n_type & MachO::N_TYPE) == MachO::N_UNDF &&
476         Entry.n_value == 0)
477       Res = UnknownAddressOrSize;
478     else
479       Res = Entry.n_value;
480   } else {
481     MachO::nlist Entry = getSymbolTableEntry(Symb);
482     if ((Entry.n_type & MachO::N_TYPE) == MachO::N_UNDF &&
483         Entry.n_value == 0)
484       Res = UnknownAddressOrSize;
485     else
486       Res = Entry.n_value;
487   }
488   return object_error::success;
489 }
490 
491 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
492                                                uint32_t &Result) const {
493   uint32_t flags = getSymbolFlags(DRI);
494   if (flags & SymbolRef::SF_Common) {
495     nlist_base Entry = getSymbolTableEntryBase(this, DRI);
496     Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
497   } else {
498     Result = 0;
499   }
500   return object_error::success;
501 }
502 
503 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
504                                           uint64_t &Result) const {
505   uint64_t BeginOffset;
506   uint64_t EndOffset = 0;
507   uint8_t SectionIndex;
508 
509   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
510   uint64_t Value;
511   getSymbolAddress(DRI, Value);
512   if (Value == UnknownAddressOrSize) {
513     Result = UnknownAddressOrSize;
514     return object_error::success;
515   }
516 
517   BeginOffset = Value;
518 
519   SectionIndex = Entry.n_sect;
520   if (!SectionIndex) {
521     uint32_t flags = getSymbolFlags(DRI);
522     if (flags & SymbolRef::SF_Common)
523       Result = Value;
524     else
525       Result = UnknownAddressOrSize;
526     return object_error::success;
527   }
528   // Unfortunately symbols are unsorted so we need to touch all
529   // symbols from load command
530   for (const SymbolRef &Symbol : symbols()) {
531     DataRefImpl DRI = Symbol.getRawDataRefImpl();
532     Entry = getSymbolTableEntryBase(this, DRI);
533     getSymbolAddress(DRI, Value);
534     if (Value == UnknownAddressOrSize)
535       continue;
536     if (Entry.n_sect == SectionIndex && Value > BeginOffset)
537       if (!EndOffset || Value < EndOffset)
538         EndOffset = Value;
539   }
540   if (!EndOffset) {
541     uint64_t Size;
542     DataRefImpl Sec;
543     Sec.d.a = SectionIndex-1;
544     getSectionSize(Sec, Size);
545     getSectionAddress(Sec, EndOffset);
546     EndOffset += Size;
547   }
548   Result = EndOffset - BeginOffset;
549   return object_error::success;
550 }
551 
552 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
553                                           SymbolRef::Type &Res) const {
554   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
555   uint8_t n_type = Entry.n_type;
556 
557   Res = SymbolRef::ST_Other;
558 
559   // If this is a STAB debugging symbol, we can do nothing more.
560   if (n_type & MachO::N_STAB) {
561     Res = SymbolRef::ST_Debug;
562     return object_error::success;
563   }
564 
565   switch (n_type & MachO::N_TYPE) {
566     case MachO::N_UNDF :
567       Res = SymbolRef::ST_Unknown;
568       break;
569     case MachO::N_SECT :
570       Res = SymbolRef::ST_Function;
571       break;
572   }
573   return object_error::success;
574 }
575 
576 uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
577   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
578 
579   uint8_t MachOType = Entry.n_type;
580   uint16_t MachOFlags = Entry.n_desc;
581 
582   uint32_t Result = SymbolRef::SF_None;
583 
584   if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
585     Result |= SymbolRef::SF_Undefined;
586 
587   if (MachOType & MachO::N_STAB)
588     Result |= SymbolRef::SF_FormatSpecific;
589 
590   if (MachOType & MachO::N_EXT) {
591     Result |= SymbolRef::SF_Global;
592     if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
593       uint64_t Value;
594       getSymbolAddress(DRI, Value);
595       if (Value && Value != UnknownAddressOrSize)
596         Result |= SymbolRef::SF_Common;
597     }
598   }
599 
600   if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
601     Result |= SymbolRef::SF_Weak;
602 
603   if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
604     Result |= SymbolRef::SF_Absolute;
605 
606   return Result;
607 }
608 
609 error_code
610 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
611                                   section_iterator &Res) const {
612   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
613   uint8_t index = Entry.n_sect;
614 
615   if (index == 0) {
616     Res = section_end();
617   } else {
618     DataRefImpl DRI;
619     DRI.d.a = index - 1;
620     Res = section_iterator(SectionRef(DRI, this));
621   }
622 
623   return object_error::success;
624 }
625 
626 void MachOObjectFile::moveSectionNext(DataRefImpl &Sec) const {
627   Sec.d.a++;
628 }
629 
630 error_code
631 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
632   ArrayRef<char> Raw = getSectionRawName(Sec);
633   Result = parseSegmentOrSectionName(Raw.data());
634   return object_error::success;
635 }
636 
637 error_code
638 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
639   if (is64Bit()) {
640     MachO::section_64 Sect = getSection64(Sec);
641     Res = Sect.addr;
642   } else {
643     MachO::section Sect = getSection(Sec);
644     Res = Sect.addr;
645   }
646   return object_error::success;
647 }
648 
649 error_code
650 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
651   if (is64Bit()) {
652     MachO::section_64 Sect = getSection64(Sec);
653     Res = Sect.size;
654   } else {
655     MachO::section Sect = getSection(Sec);
656     Res = Sect.size;
657   }
658 
659   return object_error::success;
660 }
661 
662 error_code
663 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
664   uint32_t Offset;
665   uint64_t Size;
666 
667   if (is64Bit()) {
668     MachO::section_64 Sect = getSection64(Sec);
669     Offset = Sect.offset;
670     Size = Sect.size;
671   } else {
672     MachO::section Sect = getSection(Sec);
673     Offset = Sect.offset;
674     Size = Sect.size;
675   }
676 
677   Res = this->getData().substr(Offset, Size);
678   return object_error::success;
679 }
680 
681 error_code
682 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
683   uint32_t Align;
684   if (is64Bit()) {
685     MachO::section_64 Sect = getSection64(Sec);
686     Align = Sect.align;
687   } else {
688     MachO::section Sect = getSection(Sec);
689     Align = Sect.align;
690   }
691 
692   Res = uint64_t(1) << Align;
693   return object_error::success;
694 }
695 
696 error_code
697 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
698   uint32_t Flags = getSectionFlags(this, Sec);
699   Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
700   return object_error::success;
701 }
702 
703 error_code MachOObjectFile::isSectionData(DataRefImpl Sec, bool &Result) const {
704   uint32_t Flags = getSectionFlags(this, Sec);
705   unsigned SectionType = Flags & MachO::SECTION_TYPE;
706   Result = !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) &&
707            !(SectionType == MachO::S_ZEROFILL ||
708              SectionType == MachO::S_GB_ZEROFILL);
709   return object_error::success;
710 }
711 
712 error_code MachOObjectFile::isSectionBSS(DataRefImpl Sec, bool &Result) const {
713   uint32_t Flags = getSectionFlags(this, Sec);
714   unsigned SectionType = Flags & MachO::SECTION_TYPE;
715   Result = !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) &&
716            (SectionType == MachO::S_ZEROFILL ||
717             SectionType == MachO::S_GB_ZEROFILL);
718   return object_error::success;
719 }
720 
721 error_code
722 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
723                                                bool &Result) const {
724   // FIXME: Unimplemented.
725   Result = true;
726   return object_error::success;
727 }
728 
729 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
730                                              bool &Result) const {
731   // FIXME: Unimplemented.
732   Result = false;
733   return object_error::success;
734 }
735 
736 error_code
737 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
738   uint32_t Flags = getSectionFlags(this, Sec);
739   unsigned SectionType = Flags & MachO::SECTION_TYPE;
740   Res = SectionType == MachO::S_ZEROFILL ||
741     SectionType == MachO::S_GB_ZEROFILL;
742   return object_error::success;
743 }
744 
745 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
746                                                   bool &Result) const {
747   // Consider using the code from isSectionText to look for __const sections.
748   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
749   // to use section attributes to distinguish code from data.
750 
751   // FIXME: Unimplemented.
752   Result = false;
753   return object_error::success;
754 }
755 
756 error_code
757 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
758                                        bool &Result) const {
759   SymbolRef::Type ST;
760   this->getSymbolType(Symb, ST);
761   if (ST == SymbolRef::ST_Unknown) {
762     Result = false;
763     return object_error::success;
764   }
765 
766   uint64_t SectBegin, SectEnd;
767   getSectionAddress(Sec, SectBegin);
768   getSectionSize(Sec, SectEnd);
769   SectEnd += SectBegin;
770 
771   uint64_t SymAddr;
772   getSymbolAddress(Symb, SymAddr);
773   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
774 
775   return object_error::success;
776 }
777 
778 relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
779   DataRefImpl Ret;
780   Ret.d.a = Sec.d.a;
781   Ret.d.b = 0;
782   return relocation_iterator(RelocationRef(Ret, this));
783 }
784 
785 relocation_iterator
786 MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
787   uint32_t Num;
788   if (is64Bit()) {
789     MachO::section_64 Sect = getSection64(Sec);
790     Num = Sect.nreloc;
791   } else {
792     MachO::section Sect = getSection(Sec);
793     Num = Sect.nreloc;
794   }
795 
796   DataRefImpl Ret;
797   Ret.d.a = Sec.d.a;
798   Ret.d.b = Num;
799   return relocation_iterator(RelocationRef(Ret, this));
800 }
801 
802 void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
803   ++Rel.d.b;
804 }
805 
806 error_code
807 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
808   uint64_t Offset;
809   getRelocationOffset(Rel, Offset);
810 
811   DataRefImpl Sec;
812   Sec.d.a = Rel.d.a;
813   uint64_t SecAddress;
814   getSectionAddress(Sec, SecAddress);
815   Res = SecAddress + Offset;
816   return object_error::success;
817 }
818 
819 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
820                                                 uint64_t &Res) const {
821   assert(getHeader().filetype == MachO::MH_OBJECT &&
822          "Only implemented for MH_OBJECT");
823   MachO::any_relocation_info RE = getRelocation(Rel);
824   Res = getAnyRelocationAddress(RE);
825   return object_error::success;
826 }
827 
828 symbol_iterator
829 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
830   MachO::any_relocation_info RE = getRelocation(Rel);
831   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
832   bool isExtern = getPlainRelocationExternal(RE);
833   if (!isExtern)
834     return symbol_end();
835 
836   MachO::symtab_command S = getSymtabLoadCommand();
837   unsigned SymbolTableEntrySize = is64Bit() ?
838     sizeof(MachO::nlist_64) :
839     sizeof(MachO::nlist);
840   uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
841   DataRefImpl Sym;
842   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
843   return symbol_iterator(SymbolRef(Sym, this));
844 }
845 
846 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
847                                               uint64_t &Res) const {
848   MachO::any_relocation_info RE = getRelocation(Rel);
849   Res = getAnyRelocationType(RE);
850   return object_error::success;
851 }
852 
853 error_code
854 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
855                                        SmallVectorImpl<char> &Result) const {
856   StringRef res;
857   uint64_t RType;
858   getRelocationType(Rel, RType);
859 
860   unsigned Arch = this->getArch();
861 
862   switch (Arch) {
863     case Triple::x86: {
864       static const char *const Table[] =  {
865         "GENERIC_RELOC_VANILLA",
866         "GENERIC_RELOC_PAIR",
867         "GENERIC_RELOC_SECTDIFF",
868         "GENERIC_RELOC_PB_LA_PTR",
869         "GENERIC_RELOC_LOCAL_SECTDIFF",
870         "GENERIC_RELOC_TLV" };
871 
872       if (RType > 5)
873         res = "Unknown";
874       else
875         res = Table[RType];
876       break;
877     }
878     case Triple::x86_64: {
879       static const char *const Table[] =  {
880         "X86_64_RELOC_UNSIGNED",
881         "X86_64_RELOC_SIGNED",
882         "X86_64_RELOC_BRANCH",
883         "X86_64_RELOC_GOT_LOAD",
884         "X86_64_RELOC_GOT",
885         "X86_64_RELOC_SUBTRACTOR",
886         "X86_64_RELOC_SIGNED_1",
887         "X86_64_RELOC_SIGNED_2",
888         "X86_64_RELOC_SIGNED_4",
889         "X86_64_RELOC_TLV" };
890 
891       if (RType > 9)
892         res = "Unknown";
893       else
894         res = Table[RType];
895       break;
896     }
897     case Triple::arm: {
898       static const char *const Table[] =  {
899         "ARM_RELOC_VANILLA",
900         "ARM_RELOC_PAIR",
901         "ARM_RELOC_SECTDIFF",
902         "ARM_RELOC_LOCAL_SECTDIFF",
903         "ARM_RELOC_PB_LA_PTR",
904         "ARM_RELOC_BR24",
905         "ARM_THUMB_RELOC_BR22",
906         "ARM_THUMB_32BIT_BRANCH",
907         "ARM_RELOC_HALF",
908         "ARM_RELOC_HALF_SECTDIFF" };
909 
910       if (RType > 9)
911         res = "Unknown";
912       else
913         res = Table[RType];
914       break;
915     }
916     case Triple::arm64:
917     case Triple::aarch64: {
918       static const char *const Table[] = {
919         "ARM64_RELOC_UNSIGNED",           "ARM64_RELOC_SUBTRACTOR",
920         "ARM64_RELOC_BRANCH26",           "ARM64_RELOC_PAGE21",
921         "ARM64_RELOC_PAGEOFF12",          "ARM64_RELOC_GOT_LOAD_PAGE21",
922         "ARM64_RELOC_GOT_LOAD_PAGEOFF12", "ARM64_RELOC_POINTER_TO_GOT",
923         "ARM64_RELOC_TLVP_LOAD_PAGE21",   "ARM64_RELOC_TLVP_LOAD_PAGEOFF12",
924         "ARM64_RELOC_ADDEND"
925       };
926 
927       if (RType >= array_lengthof(Table))
928         res = "Unknown";
929       else
930         res = Table[RType];
931       break;
932     }
933     case Triple::ppc: {
934       static const char *const Table[] =  {
935         "PPC_RELOC_VANILLA",
936         "PPC_RELOC_PAIR",
937         "PPC_RELOC_BR14",
938         "PPC_RELOC_BR24",
939         "PPC_RELOC_HI16",
940         "PPC_RELOC_LO16",
941         "PPC_RELOC_HA16",
942         "PPC_RELOC_LO14",
943         "PPC_RELOC_SECTDIFF",
944         "PPC_RELOC_PB_LA_PTR",
945         "PPC_RELOC_HI16_SECTDIFF",
946         "PPC_RELOC_LO16_SECTDIFF",
947         "PPC_RELOC_HA16_SECTDIFF",
948         "PPC_RELOC_JBSR",
949         "PPC_RELOC_LO14_SECTDIFF",
950         "PPC_RELOC_LOCAL_SECTDIFF" };
951 
952       if (RType > 15)
953         res = "Unknown";
954       else
955         res = Table[RType];
956       break;
957     }
958     case Triple::UnknownArch:
959       res = "Unknown";
960       break;
961   }
962   Result.append(res.begin(), res.end());
963   return object_error::success;
964 }
965 
966 error_code
967 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
968                                           SmallVectorImpl<char> &Result) const {
969   MachO::any_relocation_info RE = getRelocation(Rel);
970 
971   unsigned Arch = this->getArch();
972 
973   std::string fmtbuf;
974   raw_string_ostream fmt(fmtbuf);
975   unsigned Type = this->getAnyRelocationType(RE);
976   bool IsPCRel = this->getAnyRelocationPCRel(RE);
977 
978   // Determine any addends that should be displayed with the relocation.
979   // These require decoding the relocation type, which is triple-specific.
980 
981   // X86_64 has entirely custom relocation types.
982   if (Arch == Triple::x86_64) {
983     bool isPCRel = getAnyRelocationPCRel(RE);
984 
985     switch (Type) {
986       case MachO::X86_64_RELOC_GOT_LOAD:
987       case MachO::X86_64_RELOC_GOT: {
988         printRelocationTargetName(this, RE, fmt);
989         fmt << "@GOT";
990         if (isPCRel) fmt << "PCREL";
991         break;
992       }
993       case MachO::X86_64_RELOC_SUBTRACTOR: {
994         DataRefImpl RelNext = Rel;
995         moveRelocationNext(RelNext);
996         MachO::any_relocation_info RENext = getRelocation(RelNext);
997 
998         // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
999         // X86_64_RELOC_UNSIGNED.
1000         // NOTE: Scattered relocations don't exist on x86_64.
1001         unsigned RType = getAnyRelocationType(RENext);
1002         if (RType != MachO::X86_64_RELOC_UNSIGNED)
1003           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1004                              "X86_64_RELOC_SUBTRACTOR.");
1005 
1006         // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
1007         // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
1008         printRelocationTargetName(this, RENext, fmt);
1009         fmt << "-";
1010         printRelocationTargetName(this, RE, fmt);
1011         break;
1012       }
1013       case MachO::X86_64_RELOC_TLV:
1014         printRelocationTargetName(this, RE, fmt);
1015         fmt << "@TLV";
1016         if (isPCRel) fmt << "P";
1017         break;
1018       case MachO::X86_64_RELOC_SIGNED_1:
1019         printRelocationTargetName(this, RE, fmt);
1020         fmt << "-1";
1021         break;
1022       case MachO::X86_64_RELOC_SIGNED_2:
1023         printRelocationTargetName(this, RE, fmt);
1024         fmt << "-2";
1025         break;
1026       case MachO::X86_64_RELOC_SIGNED_4:
1027         printRelocationTargetName(this, RE, fmt);
1028         fmt << "-4";
1029         break;
1030       default:
1031         printRelocationTargetName(this, RE, fmt);
1032         break;
1033     }
1034   // X86 and ARM share some relocation types in common.
1035   } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1036              Arch == Triple::ppc) {
1037     // Generic relocation types...
1038     switch (Type) {
1039       case MachO::GENERIC_RELOC_PAIR: // prints no info
1040         return object_error::success;
1041       case MachO::GENERIC_RELOC_SECTDIFF: {
1042         DataRefImpl RelNext = Rel;
1043         moveRelocationNext(RelNext);
1044         MachO::any_relocation_info RENext = getRelocation(RelNext);
1045 
1046         // X86 sect diff's must be followed by a relocation of type
1047         // GENERIC_RELOC_PAIR.
1048         unsigned RType = getAnyRelocationType(RENext);
1049 
1050         if (RType != MachO::GENERIC_RELOC_PAIR)
1051           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1052                              "GENERIC_RELOC_SECTDIFF.");
1053 
1054         printRelocationTargetName(this, RE, fmt);
1055         fmt << "-";
1056         printRelocationTargetName(this, RENext, fmt);
1057         break;
1058       }
1059     }
1060 
1061     if (Arch == Triple::x86 || Arch == Triple::ppc) {
1062       switch (Type) {
1063         case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
1064           DataRefImpl RelNext = Rel;
1065           moveRelocationNext(RelNext);
1066           MachO::any_relocation_info RENext = getRelocation(RelNext);
1067 
1068           // X86 sect diff's must be followed by a relocation of type
1069           // GENERIC_RELOC_PAIR.
1070           unsigned RType = getAnyRelocationType(RENext);
1071           if (RType != MachO::GENERIC_RELOC_PAIR)
1072             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1073                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1074 
1075           printRelocationTargetName(this, RE, fmt);
1076           fmt << "-";
1077           printRelocationTargetName(this, RENext, fmt);
1078           break;
1079         }
1080         case MachO::GENERIC_RELOC_TLV: {
1081           printRelocationTargetName(this, RE, fmt);
1082           fmt << "@TLV";
1083           if (IsPCRel) fmt << "P";
1084           break;
1085         }
1086         default:
1087           printRelocationTargetName(this, RE, fmt);
1088       }
1089     } else { // ARM-specific relocations
1090       switch (Type) {
1091         case MachO::ARM_RELOC_HALF:
1092         case MachO::ARM_RELOC_HALF_SECTDIFF: {
1093           // Half relocations steal a bit from the length field to encode
1094           // whether this is an upper16 or a lower16 relocation.
1095           bool isUpper = getAnyRelocationLength(RE) >> 1;
1096 
1097           if (isUpper)
1098             fmt << ":upper16:(";
1099           else
1100             fmt << ":lower16:(";
1101           printRelocationTargetName(this, RE, fmt);
1102 
1103           DataRefImpl RelNext = Rel;
1104           moveRelocationNext(RelNext);
1105           MachO::any_relocation_info RENext = getRelocation(RelNext);
1106 
1107           // ARM half relocs must be followed by a relocation of type
1108           // ARM_RELOC_PAIR.
1109           unsigned RType = getAnyRelocationType(RENext);
1110           if (RType != MachO::ARM_RELOC_PAIR)
1111             report_fatal_error("Expected ARM_RELOC_PAIR after "
1112                                "ARM_RELOC_HALF");
1113 
1114           // NOTE: The half of the target virtual address is stashed in the
1115           // address field of the secondary relocation, but we can't reverse
1116           // engineer the constant offset from it without decoding the movw/movt
1117           // instruction to find the other half in its immediate field.
1118 
1119           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1120           // symbol/section pointer of the follow-on relocation.
1121           if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
1122             fmt << "-";
1123             printRelocationTargetName(this, RENext, fmt);
1124           }
1125 
1126           fmt << ")";
1127           break;
1128         }
1129         default: {
1130           printRelocationTargetName(this, RE, fmt);
1131         }
1132       }
1133     }
1134   } else
1135     printRelocationTargetName(this, RE, fmt);
1136 
1137   fmt.flush();
1138   Result.append(fmtbuf.begin(), fmtbuf.end());
1139   return object_error::success;
1140 }
1141 
1142 error_code
1143 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1144   unsigned Arch = getArch();
1145   uint64_t Type;
1146   getRelocationType(Rel, Type);
1147 
1148   Result = false;
1149 
1150   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1151   // is always hidden.
1152   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1153     if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
1154   } else if (Arch == Triple::x86_64) {
1155     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1156     // an X86_64_RELOC_SUBTRACTOR.
1157     if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
1158       DataRefImpl RelPrev = Rel;
1159       RelPrev.d.a--;
1160       uint64_t PrevType;
1161       getRelocationType(RelPrev, PrevType);
1162       if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
1163         Result = true;
1164     }
1165   }
1166 
1167   return object_error::success;
1168 }
1169 
1170 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1171                                            LibraryRef &Res) const {
1172   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1173 }
1174 
1175 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1176                                            StringRef &Res) const {
1177   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1178 }
1179 
1180 basic_symbol_iterator MachOObjectFile::symbol_begin_impl() const {
1181   return getSymbolByIndex(0);
1182 }
1183 
1184 basic_symbol_iterator MachOObjectFile::symbol_end_impl() const {
1185   DataRefImpl DRI;
1186   if (!SymtabLoadCmd)
1187     return basic_symbol_iterator(SymbolRef(DRI, this));
1188 
1189   MachO::symtab_command Symtab = getSymtabLoadCommand();
1190   unsigned SymbolTableEntrySize = is64Bit() ?
1191     sizeof(MachO::nlist_64) :
1192     sizeof(MachO::nlist);
1193   unsigned Offset = Symtab.symoff +
1194     Symtab.nsyms * SymbolTableEntrySize;
1195   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1196   return basic_symbol_iterator(SymbolRef(DRI, this));
1197 }
1198 
1199 basic_symbol_iterator MachOObjectFile::getSymbolByIndex(unsigned Index) const {
1200   DataRefImpl DRI;
1201   if (!SymtabLoadCmd)
1202     return basic_symbol_iterator(SymbolRef(DRI, this));
1203 
1204   MachO::symtab_command Symtab = getSymtabLoadCommand();
1205   assert(Index < Symtab.nsyms && "Requested symbol index is out of range.");
1206   unsigned SymbolTableEntrySize =
1207     is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist);
1208   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
1209   DRI.p += Index * SymbolTableEntrySize;
1210   return basic_symbol_iterator(SymbolRef(DRI, this));
1211 }
1212 
1213 section_iterator MachOObjectFile::section_begin() const {
1214   DataRefImpl DRI;
1215   return section_iterator(SectionRef(DRI, this));
1216 }
1217 
1218 section_iterator MachOObjectFile::section_end() const {
1219   DataRefImpl DRI;
1220   DRI.d.a = Sections.size();
1221   return section_iterator(SectionRef(DRI, this));
1222 }
1223 
1224 library_iterator MachOObjectFile::needed_library_begin() const {
1225   // TODO: implement
1226   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1227 }
1228 
1229 library_iterator MachOObjectFile::needed_library_end() const {
1230   // TODO: implement
1231   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1232 }
1233 
1234 uint8_t MachOObjectFile::getBytesInAddress() const {
1235   return is64Bit() ? 8 : 4;
1236 }
1237 
1238 StringRef MachOObjectFile::getFileFormatName() const {
1239   unsigned CPUType = getCPUType(this);
1240   if (!is64Bit()) {
1241     switch (CPUType) {
1242     case llvm::MachO::CPU_TYPE_I386:
1243       return "Mach-O 32-bit i386";
1244     case llvm::MachO::CPU_TYPE_ARM:
1245       return "Mach-O arm";
1246     case llvm::MachO::CPU_TYPE_POWERPC:
1247       return "Mach-O 32-bit ppc";
1248     default:
1249       assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
1250              "64-bit object file when we're not 64-bit?");
1251       return "Mach-O 32-bit unknown";
1252     }
1253   }
1254 
1255   // Make sure the cpu type has the correct mask.
1256   assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
1257          == llvm::MachO::CPU_ARCH_ABI64 &&
1258          "32-bit object file when we're 64-bit?");
1259 
1260   switch (CPUType) {
1261   case llvm::MachO::CPU_TYPE_X86_64:
1262     return "Mach-O 64-bit x86-64";
1263   case llvm::MachO::CPU_TYPE_ARM64:
1264     return "Mach-O arm64";
1265   case llvm::MachO::CPU_TYPE_POWERPC64:
1266     return "Mach-O 64-bit ppc64";
1267   default:
1268     return "Mach-O 64-bit unknown";
1269   }
1270 }
1271 
1272 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1273   switch (CPUType) {
1274   case llvm::MachO::CPU_TYPE_I386:
1275     return Triple::x86;
1276   case llvm::MachO::CPU_TYPE_X86_64:
1277     return Triple::x86_64;
1278   case llvm::MachO::CPU_TYPE_ARM:
1279     return Triple::arm;
1280   case llvm::MachO::CPU_TYPE_ARM64:
1281     return Triple::arm64;
1282   case llvm::MachO::CPU_TYPE_POWERPC:
1283     return Triple::ppc;
1284   case llvm::MachO::CPU_TYPE_POWERPC64:
1285     return Triple::ppc64;
1286   default:
1287     return Triple::UnknownArch;
1288   }
1289 }
1290 
1291 unsigned MachOObjectFile::getArch() const {
1292   return getArch(getCPUType(this));
1293 }
1294 
1295 StringRef MachOObjectFile::getLoadName() const {
1296   // TODO: Implement
1297   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1298 }
1299 
1300 relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
1301   DataRefImpl DRI;
1302   DRI.d.a = Index;
1303   return section_rel_begin(DRI);
1304 }
1305 
1306 relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
1307   DataRefImpl DRI;
1308   DRI.d.a = Index;
1309   return section_rel_end(DRI);
1310 }
1311 
1312 dice_iterator MachOObjectFile::begin_dices() const {
1313   DataRefImpl DRI;
1314   if (!DataInCodeLoadCmd)
1315     return dice_iterator(DiceRef(DRI, this));
1316 
1317   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1318   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
1319   return dice_iterator(DiceRef(DRI, this));
1320 }
1321 
1322 dice_iterator MachOObjectFile::end_dices() const {
1323   DataRefImpl DRI;
1324   if (!DataInCodeLoadCmd)
1325     return dice_iterator(DiceRef(DRI, this));
1326 
1327   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1328   unsigned Offset = DicLC.dataoff + DicLC.datasize;
1329   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1330   return dice_iterator(DiceRef(DRI, this));
1331 }
1332 
1333 StringRef
1334 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1335   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1336   return parseSegmentOrSectionName(Raw.data());
1337 }
1338 
1339 ArrayRef<char>
1340 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1341   const section_base *Base =
1342     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1343   return ArrayRef<char>(Base->sectname);
1344 }
1345 
1346 ArrayRef<char>
1347 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1348   const section_base *Base =
1349     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1350   return ArrayRef<char>(Base->segname);
1351 }
1352 
1353 bool
1354 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
1355   const {
1356   if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
1357     return false;
1358   return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
1359 }
1360 
1361 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1362     const MachO::any_relocation_info &RE) const {
1363   if (isLittleEndian())
1364     return RE.r_word1 & 0xffffff;
1365   return RE.r_word1 >> 8;
1366 }
1367 
1368 bool MachOObjectFile::getPlainRelocationExternal(
1369     const MachO::any_relocation_info &RE) const {
1370   if (isLittleEndian())
1371     return (RE.r_word1 >> 27) & 1;
1372   return (RE.r_word1 >> 4) & 1;
1373 }
1374 
1375 bool MachOObjectFile::getScatteredRelocationScattered(
1376     const MachO::any_relocation_info &RE) const {
1377   return RE.r_word0 >> 31;
1378 }
1379 
1380 uint32_t MachOObjectFile::getScatteredRelocationValue(
1381     const MachO::any_relocation_info &RE) const {
1382   return RE.r_word1;
1383 }
1384 
1385 unsigned MachOObjectFile::getAnyRelocationAddress(
1386     const MachO::any_relocation_info &RE) const {
1387   if (isRelocationScattered(RE))
1388     return getScatteredRelocationAddress(RE);
1389   return getPlainRelocationAddress(RE);
1390 }
1391 
1392 unsigned MachOObjectFile::getAnyRelocationPCRel(
1393     const MachO::any_relocation_info &RE) const {
1394   if (isRelocationScattered(RE))
1395     return getScatteredRelocationPCRel(this, RE);
1396   return getPlainRelocationPCRel(this, RE);
1397 }
1398 
1399 unsigned MachOObjectFile::getAnyRelocationLength(
1400     const MachO::any_relocation_info &RE) const {
1401   if (isRelocationScattered(RE))
1402     return getScatteredRelocationLength(RE);
1403   return getPlainRelocationLength(this, RE);
1404 }
1405 
1406 unsigned
1407 MachOObjectFile::getAnyRelocationType(
1408                                    const MachO::any_relocation_info &RE) const {
1409   if (isRelocationScattered(RE))
1410     return getScatteredRelocationType(RE);
1411   return getPlainRelocationType(this, RE);
1412 }
1413 
1414 SectionRef
1415 MachOObjectFile::getRelocationSection(
1416                                    const MachO::any_relocation_info &RE) const {
1417   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1418     return *section_end();
1419   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1420   DataRefImpl DRI;
1421   DRI.d.a = SecNum;
1422   return SectionRef(DRI, this);
1423 }
1424 
1425 MachOObjectFile::LoadCommandInfo
1426 MachOObjectFile::getFirstLoadCommandInfo() const {
1427   MachOObjectFile::LoadCommandInfo Load;
1428 
1429   unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
1430                                     sizeof(MachO::mach_header);
1431   Load.Ptr = getPtr(this, HeaderSize);
1432   Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
1433   return Load;
1434 }
1435 
1436 MachOObjectFile::LoadCommandInfo
1437 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1438   MachOObjectFile::LoadCommandInfo Next;
1439   Next.Ptr = L.Ptr + L.C.cmdsize;
1440   Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
1441   return Next;
1442 }
1443 
1444 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
1445   return getStruct<MachO::section>(this, Sections[DRI.d.a]);
1446 }
1447 
1448 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1449   return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
1450 }
1451 
1452 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
1453                                            unsigned Index) const {
1454   const char *Sec = getSectionPtr(this, L, Index);
1455   return getStruct<MachO::section>(this, Sec);
1456 }
1457 
1458 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1459                                                 unsigned Index) const {
1460   const char *Sec = getSectionPtr(this, L, Index);
1461   return getStruct<MachO::section_64>(this, Sec);
1462 }
1463 
1464 MachO::nlist
1465 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1466   const char *P = reinterpret_cast<const char *>(DRI.p);
1467   return getStruct<MachO::nlist>(this, P);
1468 }
1469 
1470 MachO::nlist_64
1471 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1472   const char *P = reinterpret_cast<const char *>(DRI.p);
1473   return getStruct<MachO::nlist_64>(this, P);
1474 }
1475 
1476 MachO::linkedit_data_command
1477 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
1478   return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
1479 }
1480 
1481 MachO::segment_command
1482 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1483   return getStruct<MachO::segment_command>(this, L.Ptr);
1484 }
1485 
1486 MachO::segment_command_64
1487 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1488   return getStruct<MachO::segment_command_64>(this, L.Ptr);
1489 }
1490 
1491 MachO::linker_options_command
1492 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1493   return getStruct<MachO::linker_options_command>(this, L.Ptr);
1494 }
1495 
1496 MachO::version_min_command
1497 MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const {
1498   return getStruct<MachO::version_min_command>(this, L.Ptr);
1499 }
1500 
1501 MachO::any_relocation_info
1502 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1503   DataRefImpl Sec;
1504   Sec.d.a = Rel.d.a;
1505   uint32_t Offset;
1506   if (is64Bit()) {
1507     MachO::section_64 Sect = getSection64(Sec);
1508     Offset = Sect.reloff;
1509   } else {
1510     MachO::section Sect = getSection(Sec);
1511     Offset = Sect.reloff;
1512   }
1513 
1514   auto P = reinterpret_cast<const MachO::any_relocation_info *>(
1515       getPtr(this, Offset)) + Rel.d.b;
1516   return getStruct<MachO::any_relocation_info>(
1517       this, reinterpret_cast<const char *>(P));
1518 }
1519 
1520 MachO::data_in_code_entry
1521 MachOObjectFile::getDice(DataRefImpl Rel) const {
1522   const char *P = reinterpret_cast<const char *>(Rel.p);
1523   return getStruct<MachO::data_in_code_entry>(this, P);
1524 }
1525 
1526 MachO::mach_header MachOObjectFile::getHeader() const {
1527   return getStruct<MachO::mach_header>(this, getPtr(this, 0));
1528 }
1529 
1530 MachO::mach_header_64 MachOObjectFile::getHeader64() const {
1531   return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
1532 }
1533 
1534 uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
1535                                              const MachO::dysymtab_command &DLC,
1536                                              unsigned Index) const {
1537   uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
1538   return getStruct<uint32_t>(this, getPtr(this, Offset));
1539 }
1540 
1541 MachO::data_in_code_entry
1542 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1543                                          unsigned Index) const {
1544   uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
1545   return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
1546 }
1547 
1548 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
1549   return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
1550 }
1551 
1552 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
1553   return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
1554 }
1555 
1556 MachO::linkedit_data_command
1557 MachOObjectFile::getDataInCodeLoadCommand() const {
1558   if (DataInCodeLoadCmd)
1559     return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
1560 
1561   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1562   MachO::linkedit_data_command Cmd;
1563   Cmd.cmd = MachO::LC_DATA_IN_CODE;
1564   Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
1565   Cmd.dataoff = 0;
1566   Cmd.datasize = 0;
1567   return Cmd;
1568 }
1569 
1570 StringRef MachOObjectFile::getStringTableData() const {
1571   MachO::symtab_command S = getSymtabLoadCommand();
1572   return getData().substr(S.stroff, S.strsize);
1573 }
1574 
1575 bool MachOObjectFile::is64Bit() const {
1576   return getType() == getMachOType(false, true) ||
1577     getType() == getMachOType(true, true);
1578 }
1579 
1580 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1581                                    SmallVectorImpl<uint64_t> &Out) const {
1582   DataExtractor extractor(ObjectFile::getData(), true, 0);
1583 
1584   uint32_t offset = Index;
1585   uint64_t data = 0;
1586   while (uint64_t delta = extractor.getULEB128(&offset)) {
1587     data += delta;
1588     Out.push_back(data);
1589   }
1590 }
1591 
1592 ErrorOr<ObjectFile *> ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer,
1593                                                         bool BufferOwned) {
1594   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1595   error_code EC;
1596   std::unique_ptr<MachOObjectFile> Ret;
1597   if (Magic == "\xFE\xED\xFA\xCE")
1598     Ret.reset(new MachOObjectFile(Buffer, false, false, EC, BufferOwned));
1599   else if (Magic == "\xCE\xFA\xED\xFE")
1600     Ret.reset(new MachOObjectFile(Buffer, true, false, EC, BufferOwned));
1601   else if (Magic == "\xFE\xED\xFA\xCF")
1602     Ret.reset(new MachOObjectFile(Buffer, false, true, EC, BufferOwned));
1603   else if (Magic == "\xCF\xFA\xED\xFE")
1604     Ret.reset(new MachOObjectFile(Buffer, true, true, EC, BufferOwned));
1605   else {
1606     delete Buffer;
1607     return object_error::parse_failed;
1608   }
1609 
1610   if (EC)
1611     return EC;
1612   return Ret.release();
1613 }
1614 
1615 } // end namespace object
1616 } // end namespace llvm
1617