xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision a2782f6e77f175ceccf634f454956f1986388e4c) 
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
483 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
484                                      uint64_t &Res) const {
485   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
486   getSymbolAddress(Symb, Res);
487   if (Entry.n_sect) {
488     uint64_t Delta;
489     DataRefImpl SecRel;
490     SecRel.d.a = Entry.n_sect-1;
491     if (is64Bit()) {
492       MachO::section_64 Sec = getSection64(SecRel);
493       Delta = Sec.offset - Sec.addr;
494     } else {
495       MachO::section Sec = getSection(SecRel);
496       Delta = Sec.offset - Sec.addr;
497     }
498 
499     Res += Delta;
500   }
501 
502   return object_error::success;
503 }
504 
505 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
506                                                uint32_t &Result) const {
507   uint32_t flags = getSymbolFlags(DRI);
508   if (flags & SymbolRef::SF_Common) {
509     nlist_base Entry = getSymbolTableEntryBase(this, DRI);
510     Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
511   } else {
512     Result = 0;
513   }
514   return object_error::success;
515 }
516 
517 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
518                                           uint64_t &Result) const {
519   uint64_t BeginOffset;
520   uint64_t EndOffset = 0;
521   uint8_t SectionIndex;
522 
523   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
524   uint64_t Value;
525   getSymbolAddress(DRI, Value);
526 
527   BeginOffset = Value;
528 
529   SectionIndex = Entry.n_sect;
530   if (!SectionIndex) {
531     uint32_t flags = getSymbolFlags(DRI);
532     if (flags & SymbolRef::SF_Common)
533       Result = Value;
534     else
535       Result = UnknownAddressOrSize;
536     return object_error::success;
537   }
538   // Unfortunately symbols are unsorted so we need to touch all
539   // symbols from load command
540   for (const SymbolRef &Symbol : symbols()) {
541     DataRefImpl DRI = Symbol.getRawDataRefImpl();
542     Entry = getSymbolTableEntryBase(this, DRI);
543     getSymbolAddress(DRI, Value);
544     if (Entry.n_sect == SectionIndex && Value > BeginOffset)
545       if (!EndOffset || Value < EndOffset)
546         EndOffset = Value;
547   }
548   if (!EndOffset) {
549     uint64_t Size;
550     DataRefImpl Sec;
551     Sec.d.a = SectionIndex-1;
552     getSectionSize(Sec, Size);
553     getSectionAddress(Sec, EndOffset);
554     EndOffset += Size;
555   }
556   Result = EndOffset - BeginOffset;
557   return object_error::success;
558 }
559 
560 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
561                                           SymbolRef::Type &Res) const {
562   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
563   uint8_t n_type = Entry.n_type;
564 
565   Res = SymbolRef::ST_Other;
566 
567   // If this is a STAB debugging symbol, we can do nothing more.
568   if (n_type & MachO::N_STAB) {
569     Res = SymbolRef::ST_Debug;
570     return object_error::success;
571   }
572 
573   switch (n_type & MachO::N_TYPE) {
574     case MachO::N_UNDF :
575       Res = SymbolRef::ST_Unknown;
576       break;
577     case MachO::N_SECT :
578       Res = SymbolRef::ST_Function;
579       break;
580   }
581   return object_error::success;
582 }
583 
584 uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
585   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
586 
587   uint8_t MachOType = Entry.n_type;
588   uint16_t MachOFlags = Entry.n_desc;
589 
590   uint32_t Result = SymbolRef::SF_None;
591 
592   if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
593     Result |= SymbolRef::SF_Undefined;
594 
595   if (MachOType & MachO::N_STAB)
596     Result |= SymbolRef::SF_FormatSpecific;
597 
598   if (MachOType & MachO::N_EXT) {
599     Result |= SymbolRef::SF_Global;
600     if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
601       uint64_t Value;
602       getSymbolAddress(DRI, Value);
603       if (Value)
604         Result |= SymbolRef::SF_Common;
605     }
606   }
607 
608   if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
609     Result |= SymbolRef::SF_Weak;
610 
611   if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
612     Result |= SymbolRef::SF_Absolute;
613 
614   return Result;
615 }
616 
617 error_code
618 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
619                                   section_iterator &Res) const {
620   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
621   uint8_t index = Entry.n_sect;
622 
623   if (index == 0) {
624     Res = section_end();
625   } else {
626     DataRefImpl DRI;
627     DRI.d.a = index - 1;
628     Res = section_iterator(SectionRef(DRI, this));
629   }
630 
631   return object_error::success;
632 }
633 
634 void MachOObjectFile::moveSectionNext(DataRefImpl &Sec) const {
635   Sec.d.a++;
636 }
637 
638 error_code
639 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
640   ArrayRef<char> Raw = getSectionRawName(Sec);
641   Result = parseSegmentOrSectionName(Raw.data());
642   return object_error::success;
643 }
644 
645 error_code
646 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
647   if (is64Bit()) {
648     MachO::section_64 Sect = getSection64(Sec);
649     Res = Sect.addr;
650   } else {
651     MachO::section Sect = getSection(Sec);
652     Res = Sect.addr;
653   }
654   return object_error::success;
655 }
656 
657 error_code
658 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
659   if (is64Bit()) {
660     MachO::section_64 Sect = getSection64(Sec);
661     Res = Sect.size;
662   } else {
663     MachO::section Sect = getSection(Sec);
664     Res = Sect.size;
665   }
666 
667   return object_error::success;
668 }
669 
670 error_code
671 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
672   uint32_t Offset;
673   uint64_t Size;
674 
675   if (is64Bit()) {
676     MachO::section_64 Sect = getSection64(Sec);
677     Offset = Sect.offset;
678     Size = Sect.size;
679   } else {
680     MachO::section Sect = getSection(Sec);
681     Offset = Sect.offset;
682     Size = Sect.size;
683   }
684 
685   Res = this->getData().substr(Offset, Size);
686   return object_error::success;
687 }
688 
689 error_code
690 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
691   uint32_t Align;
692   if (is64Bit()) {
693     MachO::section_64 Sect = getSection64(Sec);
694     Align = Sect.align;
695   } else {
696     MachO::section Sect = getSection(Sec);
697     Align = Sect.align;
698   }
699 
700   Res = uint64_t(1) << Align;
701   return object_error::success;
702 }
703 
704 error_code
705 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
706   uint32_t Flags = getSectionFlags(this, Sec);
707   Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
708   return object_error::success;
709 }
710 
711 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
712   // FIXME: Unimplemented.
713   Result = false;
714   return object_error::success;
715 }
716 
717 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
718   // FIXME: Unimplemented.
719   Result = false;
720   return object_error::success;
721 }
722 
723 error_code
724 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
725                                                bool &Result) const {
726   // FIXME: Unimplemented.
727   Result = true;
728   return object_error::success;
729 }
730 
731 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
732                                              bool &Result) const {
733   // FIXME: Unimplemented.
734   Result = false;
735   return object_error::success;
736 }
737 
738 error_code
739 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
740   uint32_t Flags = getSectionFlags(this, Sec);
741   unsigned SectionType = Flags & MachO::SECTION_TYPE;
742   Res = SectionType == MachO::S_ZEROFILL ||
743     SectionType == MachO::S_GB_ZEROFILL;
744   return object_error::success;
745 }
746 
747 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
748                                                   bool &Result) const {
749   // Consider using the code from isSectionText to look for __const sections.
750   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
751   // to use section attributes to distinguish code from data.
752 
753   // FIXME: Unimplemented.
754   Result = false;
755   return object_error::success;
756 }
757 
758 error_code
759 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
760                                        bool &Result) const {
761   SymbolRef::Type ST;
762   this->getSymbolType(Symb, ST);
763   if (ST == SymbolRef::ST_Unknown) {
764     Result = false;
765     return object_error::success;
766   }
767 
768   uint64_t SectBegin, SectEnd;
769   getSectionAddress(Sec, SectBegin);
770   getSectionSize(Sec, SectEnd);
771   SectEnd += SectBegin;
772 
773   uint64_t SymAddr;
774   getSymbolAddress(Symb, SymAddr);
775   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
776 
777   return object_error::success;
778 }
779 
780 relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
781   uint32_t Offset;
782   if (is64Bit()) {
783     MachO::section_64 Sect = getSection64(Sec);
784     Offset = Sect.reloff;
785   } else {
786     MachO::section Sect = getSection(Sec);
787     Offset = Sect.reloff;
788   }
789 
790   DataRefImpl Ret;
791   Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
792   return relocation_iterator(RelocationRef(Ret, this));
793 }
794 
795 relocation_iterator
796 MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
797   uint32_t Offset;
798   uint32_t Num;
799   if (is64Bit()) {
800     MachO::section_64 Sect = getSection64(Sec);
801     Offset = Sect.reloff;
802     Num = Sect.nreloc;
803   } else {
804     MachO::section Sect = getSection(Sec);
805     Offset = Sect.reloff;
806     Num = Sect.nreloc;
807   }
808 
809   const MachO::any_relocation_info *P =
810     reinterpret_cast<const MachO::any_relocation_info *>(getPtr(this, Offset));
811 
812   DataRefImpl Ret;
813   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
814   return relocation_iterator(RelocationRef(Ret, this));
815 }
816 
817 bool MachOObjectFile::section_rel_empty(DataRefImpl Sec) const {
818   if (is64Bit()) {
819     MachO::section_64 Sect = getSection64(Sec);
820     return Sect.nreloc == 0;
821   } else {
822     MachO::section Sect = getSection(Sec);
823     return Sect.nreloc == 0;
824   }
825 }
826 
827 void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
828   const MachO::any_relocation_info *P =
829     reinterpret_cast<const MachO::any_relocation_info *>(Rel.p);
830   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
831 }
832 
833 error_code
834 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
835   report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
836 }
837 
838 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
839                                                 uint64_t &Res) const {
840   MachO::any_relocation_info RE = getRelocation(Rel);
841   Res = getAnyRelocationAddress(RE);
842   return object_error::success;
843 }
844 
845 symbol_iterator
846 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
847   MachO::any_relocation_info RE = getRelocation(Rel);
848   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
849   bool isExtern = getPlainRelocationExternal(RE);
850   if (!isExtern)
851     return symbol_end();
852 
853   MachO::symtab_command S = getSymtabLoadCommand();
854   unsigned SymbolTableEntrySize = is64Bit() ?
855     sizeof(MachO::nlist_64) :
856     sizeof(MachO::nlist);
857   uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
858   DataRefImpl Sym;
859   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
860   return symbol_iterator(SymbolRef(Sym, this));
861 }
862 
863 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
864                                               uint64_t &Res) const {
865   MachO::any_relocation_info RE = getRelocation(Rel);
866   Res = getAnyRelocationType(RE);
867   return object_error::success;
868 }
869 
870 error_code
871 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
872                                        SmallVectorImpl<char> &Result) const {
873   StringRef res;
874   uint64_t RType;
875   getRelocationType(Rel, RType);
876 
877   unsigned Arch = this->getArch();
878 
879   switch (Arch) {
880     case Triple::x86: {
881       static const char *const Table[] =  {
882         "GENERIC_RELOC_VANILLA",
883         "GENERIC_RELOC_PAIR",
884         "GENERIC_RELOC_SECTDIFF",
885         "GENERIC_RELOC_PB_LA_PTR",
886         "GENERIC_RELOC_LOCAL_SECTDIFF",
887         "GENERIC_RELOC_TLV" };
888 
889       if (RType > 5)
890         res = "Unknown";
891       else
892         res = Table[RType];
893       break;
894     }
895     case Triple::x86_64: {
896       static const char *const Table[] =  {
897         "X86_64_RELOC_UNSIGNED",
898         "X86_64_RELOC_SIGNED",
899         "X86_64_RELOC_BRANCH",
900         "X86_64_RELOC_GOT_LOAD",
901         "X86_64_RELOC_GOT",
902         "X86_64_RELOC_SUBTRACTOR",
903         "X86_64_RELOC_SIGNED_1",
904         "X86_64_RELOC_SIGNED_2",
905         "X86_64_RELOC_SIGNED_4",
906         "X86_64_RELOC_TLV" };
907 
908       if (RType > 9)
909         res = "Unknown";
910       else
911         res = Table[RType];
912       break;
913     }
914     case Triple::arm: {
915       static const char *const Table[] =  {
916         "ARM_RELOC_VANILLA",
917         "ARM_RELOC_PAIR",
918         "ARM_RELOC_SECTDIFF",
919         "ARM_RELOC_LOCAL_SECTDIFF",
920         "ARM_RELOC_PB_LA_PTR",
921         "ARM_RELOC_BR24",
922         "ARM_THUMB_RELOC_BR22",
923         "ARM_THUMB_32BIT_BRANCH",
924         "ARM_RELOC_HALF",
925         "ARM_RELOC_HALF_SECTDIFF" };
926 
927       if (RType > 9)
928         res = "Unknown";
929       else
930         res = Table[RType];
931       break;
932     }
933     case Triple::arm64:
934     case Triple::aarch64: {
935       static const char *const Table[] = {
936         "ARM64_RELOC_UNSIGNED",           "ARM64_RELOC_SUBTRACTOR",
937         "ARM64_RELOC_BRANCH26",           "ARM64_RELOC_PAGE21",
938         "ARM64_RELOC_PAGEOFF12",          "ARM64_RELOC_GOT_LOAD_PAGE21",
939         "ARM64_RELOC_GOT_LOAD_PAGEOFF12", "ARM64_RELOC_POINTER_TO_GOT",
940         "ARM64_RELOC_TLVP_LOAD_PAGE21",   "ARM64_RELOC_TLVP_LOAD_PAGEOFF12",
941         "ARM64_RELOC_ADDEND"
942       };
943 
944       if (RType >= array_lengthof(Table))
945         res = "Unknown";
946       else
947         res = Table[RType];
948       break;
949     }
950     case Triple::ppc: {
951       static const char *const Table[] =  {
952         "PPC_RELOC_VANILLA",
953         "PPC_RELOC_PAIR",
954         "PPC_RELOC_BR14",
955         "PPC_RELOC_BR24",
956         "PPC_RELOC_HI16",
957         "PPC_RELOC_LO16",
958         "PPC_RELOC_HA16",
959         "PPC_RELOC_LO14",
960         "PPC_RELOC_SECTDIFF",
961         "PPC_RELOC_PB_LA_PTR",
962         "PPC_RELOC_HI16_SECTDIFF",
963         "PPC_RELOC_LO16_SECTDIFF",
964         "PPC_RELOC_HA16_SECTDIFF",
965         "PPC_RELOC_JBSR",
966         "PPC_RELOC_LO14_SECTDIFF",
967         "PPC_RELOC_LOCAL_SECTDIFF" };
968 
969       if (RType > 15)
970         res = "Unknown";
971       else
972         res = Table[RType];
973       break;
974     }
975     case Triple::UnknownArch:
976       res = "Unknown";
977       break;
978   }
979   Result.append(res.begin(), res.end());
980   return object_error::success;
981 }
982 
983 error_code
984 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
985                                           SmallVectorImpl<char> &Result) const {
986   MachO::any_relocation_info RE = getRelocation(Rel);
987 
988   unsigned Arch = this->getArch();
989 
990   std::string fmtbuf;
991   raw_string_ostream fmt(fmtbuf);
992   unsigned Type = this->getAnyRelocationType(RE);
993   bool IsPCRel = this->getAnyRelocationPCRel(RE);
994 
995   // Determine any addends that should be displayed with the relocation.
996   // These require decoding the relocation type, which is triple-specific.
997 
998   // X86_64 has entirely custom relocation types.
999   if (Arch == Triple::x86_64) {
1000     bool isPCRel = getAnyRelocationPCRel(RE);
1001 
1002     switch (Type) {
1003       case MachO::X86_64_RELOC_GOT_LOAD:
1004       case MachO::X86_64_RELOC_GOT: {
1005         printRelocationTargetName(this, RE, fmt);
1006         fmt << "@GOT";
1007         if (isPCRel) fmt << "PCREL";
1008         break;
1009       }
1010       case MachO::X86_64_RELOC_SUBTRACTOR: {
1011         DataRefImpl RelNext = Rel;
1012         RelNext.d.a++;
1013         MachO::any_relocation_info RENext = getRelocation(RelNext);
1014 
1015         // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
1016         // X86_64_RELOC_UNSIGNED.
1017         // NOTE: Scattered relocations don't exist on x86_64.
1018         unsigned RType = getAnyRelocationType(RENext);
1019         if (RType != MachO::X86_64_RELOC_UNSIGNED)
1020           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1021                              "X86_64_RELOC_SUBTRACTOR.");
1022 
1023         // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
1024         // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
1025         printRelocationTargetName(this, RENext, fmt);
1026         fmt << "-";
1027         printRelocationTargetName(this, RE, fmt);
1028         break;
1029       }
1030       case MachO::X86_64_RELOC_TLV:
1031         printRelocationTargetName(this, RE, fmt);
1032         fmt << "@TLV";
1033         if (isPCRel) fmt << "P";
1034         break;
1035       case MachO::X86_64_RELOC_SIGNED_1:
1036         printRelocationTargetName(this, RE, fmt);
1037         fmt << "-1";
1038         break;
1039       case MachO::X86_64_RELOC_SIGNED_2:
1040         printRelocationTargetName(this, RE, fmt);
1041         fmt << "-2";
1042         break;
1043       case MachO::X86_64_RELOC_SIGNED_4:
1044         printRelocationTargetName(this, RE, fmt);
1045         fmt << "-4";
1046         break;
1047       default:
1048         printRelocationTargetName(this, RE, fmt);
1049         break;
1050     }
1051   // X86 and ARM share some relocation types in common.
1052   } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1053              Arch == Triple::ppc) {
1054     // Generic relocation types...
1055     switch (Type) {
1056       case MachO::GENERIC_RELOC_PAIR: // prints no info
1057         return object_error::success;
1058       case MachO::GENERIC_RELOC_SECTDIFF: {
1059         DataRefImpl RelNext = Rel;
1060         RelNext.d.a++;
1061         MachO::any_relocation_info RENext = getRelocation(RelNext);
1062 
1063         // X86 sect diff's must be followed by a relocation of type
1064         // GENERIC_RELOC_PAIR.
1065         unsigned RType = getAnyRelocationType(RENext);
1066 
1067         if (RType != MachO::GENERIC_RELOC_PAIR)
1068           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1069                              "GENERIC_RELOC_SECTDIFF.");
1070 
1071         printRelocationTargetName(this, RE, fmt);
1072         fmt << "-";
1073         printRelocationTargetName(this, RENext, fmt);
1074         break;
1075       }
1076     }
1077 
1078     if (Arch == Triple::x86 || Arch == Triple::ppc) {
1079       switch (Type) {
1080         case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
1081           DataRefImpl RelNext = Rel;
1082           RelNext.d.a++;
1083           MachO::any_relocation_info RENext = getRelocation(RelNext);
1084 
1085           // X86 sect diff's must be followed by a relocation of type
1086           // GENERIC_RELOC_PAIR.
1087           unsigned RType = getAnyRelocationType(RENext);
1088           if (RType != MachO::GENERIC_RELOC_PAIR)
1089             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1090                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1091 
1092           printRelocationTargetName(this, RE, fmt);
1093           fmt << "-";
1094           printRelocationTargetName(this, RENext, fmt);
1095           break;
1096         }
1097         case MachO::GENERIC_RELOC_TLV: {
1098           printRelocationTargetName(this, RE, fmt);
1099           fmt << "@TLV";
1100           if (IsPCRel) fmt << "P";
1101           break;
1102         }
1103         default:
1104           printRelocationTargetName(this, RE, fmt);
1105       }
1106     } else { // ARM-specific relocations
1107       switch (Type) {
1108         case MachO::ARM_RELOC_HALF:
1109         case MachO::ARM_RELOC_HALF_SECTDIFF: {
1110           // Half relocations steal a bit from the length field to encode
1111           // whether this is an upper16 or a lower16 relocation.
1112           bool isUpper = getAnyRelocationLength(RE) >> 1;
1113 
1114           if (isUpper)
1115             fmt << ":upper16:(";
1116           else
1117             fmt << ":lower16:(";
1118           printRelocationTargetName(this, RE, fmt);
1119 
1120           DataRefImpl RelNext = Rel;
1121           RelNext.d.a++;
1122           MachO::any_relocation_info RENext = getRelocation(RelNext);
1123 
1124           // ARM half relocs must be followed by a relocation of type
1125           // ARM_RELOC_PAIR.
1126           unsigned RType = getAnyRelocationType(RENext);
1127           if (RType != MachO::ARM_RELOC_PAIR)
1128             report_fatal_error("Expected ARM_RELOC_PAIR after "
1129                                "ARM_RELOC_HALF");
1130 
1131           // NOTE: The half of the target virtual address is stashed in the
1132           // address field of the secondary relocation, but we can't reverse
1133           // engineer the constant offset from it without decoding the movw/movt
1134           // instruction to find the other half in its immediate field.
1135 
1136           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1137           // symbol/section pointer of the follow-on relocation.
1138           if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
1139             fmt << "-";
1140             printRelocationTargetName(this, RENext, fmt);
1141           }
1142 
1143           fmt << ")";
1144           break;
1145         }
1146         default: {
1147           printRelocationTargetName(this, RE, fmt);
1148         }
1149       }
1150     }
1151   } else
1152     printRelocationTargetName(this, RE, fmt);
1153 
1154   fmt.flush();
1155   Result.append(fmtbuf.begin(), fmtbuf.end());
1156   return object_error::success;
1157 }
1158 
1159 error_code
1160 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1161   unsigned Arch = getArch();
1162   uint64_t Type;
1163   getRelocationType(Rel, Type);
1164 
1165   Result = false;
1166 
1167   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1168   // is always hidden.
1169   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1170     if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
1171   } else if (Arch == Triple::x86_64) {
1172     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1173     // an X86_64_RELOC_SUBTRACTOR.
1174     if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
1175       DataRefImpl RelPrev = Rel;
1176       RelPrev.d.a--;
1177       uint64_t PrevType;
1178       getRelocationType(RelPrev, PrevType);
1179       if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
1180         Result = true;
1181     }
1182   }
1183 
1184   return object_error::success;
1185 }
1186 
1187 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1188                                            LibraryRef &Res) const {
1189   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1190 }
1191 
1192 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1193                                            StringRef &Res) const {
1194   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1195 }
1196 
1197 basic_symbol_iterator MachOObjectFile::symbol_begin_impl() const {
1198   DataRefImpl DRI;
1199   if (!SymtabLoadCmd)
1200     return basic_symbol_iterator(SymbolRef(DRI, this));
1201 
1202   MachO::symtab_command Symtab = getSymtabLoadCommand();
1203   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
1204   return basic_symbol_iterator(SymbolRef(DRI, this));
1205 }
1206 
1207 basic_symbol_iterator MachOObjectFile::symbol_end_impl() const {
1208   DataRefImpl DRI;
1209   if (!SymtabLoadCmd)
1210     return basic_symbol_iterator(SymbolRef(DRI, this));
1211 
1212   MachO::symtab_command Symtab = getSymtabLoadCommand();
1213   unsigned SymbolTableEntrySize = is64Bit() ?
1214     sizeof(MachO::nlist_64) :
1215     sizeof(MachO::nlist);
1216   unsigned Offset = Symtab.symoff +
1217     Symtab.nsyms * SymbolTableEntrySize;
1218   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1219   return basic_symbol_iterator(SymbolRef(DRI, this));
1220 }
1221 
1222 section_iterator MachOObjectFile::section_begin() const {
1223   DataRefImpl DRI;
1224   return section_iterator(SectionRef(DRI, this));
1225 }
1226 
1227 section_iterator MachOObjectFile::section_end() const {
1228   DataRefImpl DRI;
1229   DRI.d.a = Sections.size();
1230   return section_iterator(SectionRef(DRI, this));
1231 }
1232 
1233 library_iterator MachOObjectFile::needed_library_begin() const {
1234   // TODO: implement
1235   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1236 }
1237 
1238 library_iterator MachOObjectFile::needed_library_end() const {
1239   // TODO: implement
1240   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1241 }
1242 
1243 uint8_t MachOObjectFile::getBytesInAddress() const {
1244   return is64Bit() ? 8 : 4;
1245 }
1246 
1247 StringRef MachOObjectFile::getFileFormatName() const {
1248   unsigned CPUType = getCPUType(this);
1249   if (!is64Bit()) {
1250     switch (CPUType) {
1251     case llvm::MachO::CPU_TYPE_I386:
1252       return "Mach-O 32-bit i386";
1253     case llvm::MachO::CPU_TYPE_ARM:
1254       return "Mach-O arm";
1255     case llvm::MachO::CPU_TYPE_POWERPC:
1256       return "Mach-O 32-bit ppc";
1257     default:
1258       assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
1259              "64-bit object file when we're not 64-bit?");
1260       return "Mach-O 32-bit unknown";
1261     }
1262   }
1263 
1264   // Make sure the cpu type has the correct mask.
1265   assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
1266          == llvm::MachO::CPU_ARCH_ABI64 &&
1267          "32-bit object file when we're 64-bit?");
1268 
1269   switch (CPUType) {
1270   case llvm::MachO::CPU_TYPE_X86_64:
1271     return "Mach-O 64-bit x86-64";
1272   case llvm::MachO::CPU_TYPE_ARM64:
1273     return "Mach-O arm64";
1274   case llvm::MachO::CPU_TYPE_POWERPC64:
1275     return "Mach-O 64-bit ppc64";
1276   default:
1277     return "Mach-O 64-bit unknown";
1278   }
1279 }
1280 
1281 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1282   switch (CPUType) {
1283   case llvm::MachO::CPU_TYPE_I386:
1284     return Triple::x86;
1285   case llvm::MachO::CPU_TYPE_X86_64:
1286     return Triple::x86_64;
1287   case llvm::MachO::CPU_TYPE_ARM:
1288     return Triple::arm;
1289   case llvm::MachO::CPU_TYPE_ARM64:
1290     return Triple::arm64;
1291   case llvm::MachO::CPU_TYPE_POWERPC:
1292     return Triple::ppc;
1293   case llvm::MachO::CPU_TYPE_POWERPC64:
1294     return Triple::ppc64;
1295   default:
1296     return Triple::UnknownArch;
1297   }
1298 }
1299 
1300 unsigned MachOObjectFile::getArch() const {
1301   return getArch(getCPUType(this));
1302 }
1303 
1304 StringRef MachOObjectFile::getLoadName() const {
1305   // TODO: Implement
1306   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1307 }
1308 
1309 relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
1310   DataRefImpl DRI;
1311   DRI.d.a = Index;
1312   return section_rel_begin(DRI);
1313 }
1314 
1315 relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
1316   DataRefImpl DRI;
1317   DRI.d.a = Index;
1318   return section_rel_end(DRI);
1319 }
1320 
1321 dice_iterator MachOObjectFile::begin_dices() const {
1322   DataRefImpl DRI;
1323   if (!DataInCodeLoadCmd)
1324     return dice_iterator(DiceRef(DRI, this));
1325 
1326   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1327   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
1328   return dice_iterator(DiceRef(DRI, this));
1329 }
1330 
1331 dice_iterator MachOObjectFile::end_dices() const {
1332   DataRefImpl DRI;
1333   if (!DataInCodeLoadCmd)
1334     return dice_iterator(DiceRef(DRI, this));
1335 
1336   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1337   unsigned Offset = DicLC.dataoff + DicLC.datasize;
1338   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1339   return dice_iterator(DiceRef(DRI, this));
1340 }
1341 
1342 StringRef
1343 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1344   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1345   return parseSegmentOrSectionName(Raw.data());
1346 }
1347 
1348 ArrayRef<char>
1349 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1350   const section_base *Base =
1351     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1352   return ArrayRef<char>(Base->sectname);
1353 }
1354 
1355 ArrayRef<char>
1356 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1357   const section_base *Base =
1358     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1359   return ArrayRef<char>(Base->segname);
1360 }
1361 
1362 bool
1363 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
1364   const {
1365   if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
1366     return false;
1367   return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
1368 }
1369 
1370 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1371     const MachO::any_relocation_info &RE) const {
1372   if (isLittleEndian())
1373     return RE.r_word1 & 0xffffff;
1374   return RE.r_word1 >> 8;
1375 }
1376 
1377 bool MachOObjectFile::getPlainRelocationExternal(
1378     const MachO::any_relocation_info &RE) const {
1379   if (isLittleEndian())
1380     return (RE.r_word1 >> 27) & 1;
1381   return (RE.r_word1 >> 4) & 1;
1382 }
1383 
1384 bool MachOObjectFile::getScatteredRelocationScattered(
1385     const MachO::any_relocation_info &RE) const {
1386   return RE.r_word0 >> 31;
1387 }
1388 
1389 uint32_t MachOObjectFile::getScatteredRelocationValue(
1390     const MachO::any_relocation_info &RE) const {
1391   return RE.r_word1;
1392 }
1393 
1394 unsigned MachOObjectFile::getAnyRelocationAddress(
1395     const MachO::any_relocation_info &RE) const {
1396   if (isRelocationScattered(RE))
1397     return getScatteredRelocationAddress(RE);
1398   return getPlainRelocationAddress(RE);
1399 }
1400 
1401 unsigned MachOObjectFile::getAnyRelocationPCRel(
1402     const MachO::any_relocation_info &RE) const {
1403   if (isRelocationScattered(RE))
1404     return getScatteredRelocationPCRel(this, RE);
1405   return getPlainRelocationPCRel(this, RE);
1406 }
1407 
1408 unsigned MachOObjectFile::getAnyRelocationLength(
1409     const MachO::any_relocation_info &RE) const {
1410   if (isRelocationScattered(RE))
1411     return getScatteredRelocationLength(RE);
1412   return getPlainRelocationLength(this, RE);
1413 }
1414 
1415 unsigned
1416 MachOObjectFile::getAnyRelocationType(
1417                                    const MachO::any_relocation_info &RE) const {
1418   if (isRelocationScattered(RE))
1419     return getScatteredRelocationType(RE);
1420   return getPlainRelocationType(this, RE);
1421 }
1422 
1423 SectionRef
1424 MachOObjectFile::getRelocationSection(
1425                                    const MachO::any_relocation_info &RE) const {
1426   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1427     return *section_end();
1428   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1429   DataRefImpl DRI;
1430   DRI.d.a = SecNum;
1431   return SectionRef(DRI, this);
1432 }
1433 
1434 MachOObjectFile::LoadCommandInfo
1435 MachOObjectFile::getFirstLoadCommandInfo() const {
1436   MachOObjectFile::LoadCommandInfo Load;
1437 
1438   unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
1439                                     sizeof(MachO::mach_header);
1440   Load.Ptr = getPtr(this, HeaderSize);
1441   Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
1442   return Load;
1443 }
1444 
1445 MachOObjectFile::LoadCommandInfo
1446 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1447   MachOObjectFile::LoadCommandInfo Next;
1448   Next.Ptr = L.Ptr + L.C.cmdsize;
1449   Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
1450   return Next;
1451 }
1452 
1453 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
1454   return getStruct<MachO::section>(this, Sections[DRI.d.a]);
1455 }
1456 
1457 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1458   return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
1459 }
1460 
1461 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
1462                                            unsigned Index) const {
1463   const char *Sec = getSectionPtr(this, L, Index);
1464   return getStruct<MachO::section>(this, Sec);
1465 }
1466 
1467 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1468                                                 unsigned Index) const {
1469   const char *Sec = getSectionPtr(this, L, Index);
1470   return getStruct<MachO::section_64>(this, Sec);
1471 }
1472 
1473 MachO::nlist
1474 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1475   const char *P = reinterpret_cast<const char *>(DRI.p);
1476   return getStruct<MachO::nlist>(this, P);
1477 }
1478 
1479 MachO::nlist_64
1480 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1481   const char *P = reinterpret_cast<const char *>(DRI.p);
1482   return getStruct<MachO::nlist_64>(this, P);
1483 }
1484 
1485 MachO::linkedit_data_command
1486 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
1487   return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
1488 }
1489 
1490 MachO::segment_command
1491 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1492   return getStruct<MachO::segment_command>(this, L.Ptr);
1493 }
1494 
1495 MachO::segment_command_64
1496 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1497   return getStruct<MachO::segment_command_64>(this, L.Ptr);
1498 }
1499 
1500 MachO::linker_options_command
1501 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1502   return getStruct<MachO::linker_options_command>(this, L.Ptr);
1503 }
1504 
1505 MachO::version_min_command
1506 MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const {
1507   return getStruct<MachO::version_min_command>(this, L.Ptr);
1508 }
1509 
1510 MachO::any_relocation_info
1511 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1512   const char *P = reinterpret_cast<const char *>(Rel.p);
1513   return getStruct<MachO::any_relocation_info>(this, P);
1514 }
1515 
1516 MachO::data_in_code_entry
1517 MachOObjectFile::getDice(DataRefImpl Rel) const {
1518   const char *P = reinterpret_cast<const char *>(Rel.p);
1519   return getStruct<MachO::data_in_code_entry>(this, P);
1520 }
1521 
1522 MachO::mach_header MachOObjectFile::getHeader() const {
1523   return getStruct<MachO::mach_header>(this, getPtr(this, 0));
1524 }
1525 
1526 MachO::mach_header_64 MachOObjectFile::getHeader64() const {
1527   return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
1528 }
1529 
1530 uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
1531                                              const MachO::dysymtab_command &DLC,
1532                                              unsigned Index) const {
1533   uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
1534   return getStruct<uint32_t>(this, getPtr(this, Offset));
1535 }
1536 
1537 MachO::data_in_code_entry
1538 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1539                                          unsigned Index) const {
1540   uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
1541   return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
1542 }
1543 
1544 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
1545   return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
1546 }
1547 
1548 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
1549   return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
1550 }
1551 
1552 MachO::linkedit_data_command
1553 MachOObjectFile::getDataInCodeLoadCommand() const {
1554   if (DataInCodeLoadCmd)
1555     return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
1556 
1557   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1558   MachO::linkedit_data_command Cmd;
1559   Cmd.cmd = MachO::LC_DATA_IN_CODE;
1560   Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
1561   Cmd.dataoff = 0;
1562   Cmd.datasize = 0;
1563   return Cmd;
1564 }
1565 
1566 StringRef MachOObjectFile::getStringTableData() const {
1567   MachO::symtab_command S = getSymtabLoadCommand();
1568   return getData().substr(S.stroff, S.strsize);
1569 }
1570 
1571 bool MachOObjectFile::is64Bit() const {
1572   return getType() == getMachOType(false, true) ||
1573     getType() == getMachOType(true, true);
1574 }
1575 
1576 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1577                                    SmallVectorImpl<uint64_t> &Out) const {
1578   DataExtractor extractor(ObjectFile::getData(), true, 0);
1579 
1580   uint32_t offset = Index;
1581   uint64_t data = 0;
1582   while (uint64_t delta = extractor.getULEB128(&offset)) {
1583     data += delta;
1584     Out.push_back(data);
1585   }
1586 }
1587 
1588 ErrorOr<ObjectFile *> ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer,
1589                                                         bool BufferOwned) {
1590   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1591   error_code EC;
1592   std::unique_ptr<MachOObjectFile> Ret;
1593   if (Magic == "\xFE\xED\xFA\xCE")
1594     Ret.reset(new MachOObjectFile(Buffer, false, false, EC, BufferOwned));
1595   else if (Magic == "\xCE\xFA\xED\xFE")
1596     Ret.reset(new MachOObjectFile(Buffer, true, false, EC, BufferOwned));
1597   else if (Magic == "\xFE\xED\xFA\xCF")
1598     Ret.reset(new MachOObjectFile(Buffer, false, true, EC, BufferOwned));
1599   else if (Magic == "\xCF\xFA\xED\xFE")
1600     Ret.reset(new MachOObjectFile(Buffer, true, true, EC, BufferOwned));
1601   else {
1602     delete Buffer;
1603     return object_error::parse_failed;
1604   }
1605 
1606   if (EC)
1607     return EC;
1608   return Ret.release();
1609 }
1610 
1611 } // end namespace object
1612 } // end namespace llvm
1613