xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 77314aa014599282f52c0f425b7b90d8ef9ad02f) 
1 //===- MachOObjectFile.cpp - Mach-O object file binding ---------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the MachOObjectFile class, which binds the MachOObject
11 // class to the generic ObjectFile wrapper.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "llvm/Object/MachO.h"
16 #include "llvm/ADT/STLExtras.h"
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Support/DataExtractor.h"
19 #include "llvm/Support/Format.h"
20 #include "llvm/Support/Host.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include <cctype>
24 #include <cstring>
25 #include <limits>
26 
27 using namespace llvm;
28 using namespace object;
29 
30 namespace llvm {
31 namespace object {
32 
33 struct nlist_base {
34   uint32_t n_strx;
35   uint8_t n_type;
36   uint8_t n_sect;
37   uint16_t n_desc;
38 };
39 
40 struct section_base {
41   char sectname[16];
42   char segname[16];
43 };
44 
45 template<typename T>
46 static void SwapValue(T &Value) {
47   Value = sys::SwapByteOrder(Value);
48 }
49 
50 template<typename T>
51 static void SwapStruct(T &Value);
52 
53 template<>
54 void SwapStruct(MachO::any_relocation_info &H) {
55   SwapValue(H.r_word0);
56   SwapValue(H.r_word1);
57 }
58 
59 template<>
60 void SwapStruct(MachO::load_command &L) {
61   SwapValue(L.cmd);
62   SwapValue(L.cmdsize);
63 }
64 
65 template<>
66 void SwapStruct(nlist_base &S) {
67   SwapValue(S.n_strx);
68   SwapValue(S.n_desc);
69 }
70 
71 template<>
72 void SwapStruct(MachO::section &S) {
73   SwapValue(S.addr);
74   SwapValue(S.size);
75   SwapValue(S.offset);
76   SwapValue(S.align);
77   SwapValue(S.reloff);
78   SwapValue(S.nreloc);
79   SwapValue(S.flags);
80   SwapValue(S.reserved1);
81   SwapValue(S.reserved2);
82 }
83 
84 template<>
85 void SwapStruct(MachO::section_64 &S) {
86   SwapValue(S.addr);
87   SwapValue(S.size);
88   SwapValue(S.offset);
89   SwapValue(S.align);
90   SwapValue(S.reloff);
91   SwapValue(S.nreloc);
92   SwapValue(S.flags);
93   SwapValue(S.reserved1);
94   SwapValue(S.reserved2);
95   SwapValue(S.reserved3);
96 }
97 
98 template<>
99 void SwapStruct(MachO::nlist &S) {
100   SwapValue(S.n_strx);
101   SwapValue(S.n_desc);
102   SwapValue(S.n_value);
103 }
104 
105 template<>
106 void SwapStruct(MachO::nlist_64 &S) {
107   SwapValue(S.n_strx);
108   SwapValue(S.n_desc);
109   SwapValue(S.n_value);
110 }
111 
112 template<>
113 void SwapStruct(MachO::mach_header &H) {
114   SwapValue(H.magic);
115   SwapValue(H.cputype);
116   SwapValue(H.cpusubtype);
117   SwapValue(H.filetype);
118   SwapValue(H.ncmds);
119   SwapValue(H.sizeofcmds);
120   SwapValue(H.flags);
121 }
122 
123 template<>
124 void SwapStruct(MachO::mach_header_64 &H) {
125   SwapValue(H.magic);
126   SwapValue(H.cputype);
127   SwapValue(H.cpusubtype);
128   SwapValue(H.filetype);
129   SwapValue(H.ncmds);
130   SwapValue(H.sizeofcmds);
131   SwapValue(H.flags);
132   SwapValue(H.reserved);
133 }
134 
135 template<>
136 void SwapStruct(MachO::symtab_command &C) {
137   SwapValue(C.cmd);
138   SwapValue(C.cmdsize);
139   SwapValue(C.symoff);
140   SwapValue(C.nsyms);
141   SwapValue(C.stroff);
142   SwapValue(C.strsize);
143 }
144 
145 template<>
146 void SwapStruct(MachO::dysymtab_command &C) {
147   SwapValue(C.cmd);
148   SwapValue(C.cmdsize);
149   SwapValue(C.ilocalsym);
150   SwapValue(C.nlocalsym);
151   SwapValue(C.iextdefsym);
152   SwapValue(C.nextdefsym);
153   SwapValue(C.iundefsym);
154   SwapValue(C.nundefsym);
155   SwapValue(C.tocoff);
156   SwapValue(C.ntoc);
157   SwapValue(C.modtaboff);
158   SwapValue(C.nmodtab);
159   SwapValue(C.extrefsymoff);
160   SwapValue(C.nextrefsyms);
161   SwapValue(C.indirectsymoff);
162   SwapValue(C.nindirectsyms);
163   SwapValue(C.extreloff);
164   SwapValue(C.nextrel);
165   SwapValue(C.locreloff);
166   SwapValue(C.nlocrel);
167 }
168 
169 template<>
170 void SwapStruct(MachO::linkedit_data_command &C) {
171   SwapValue(C.cmd);
172   SwapValue(C.cmdsize);
173   SwapValue(C.dataoff);
174   SwapValue(C.datasize);
175 }
176 
177 template<>
178 void SwapStruct(MachO::segment_command &C) {
179   SwapValue(C.cmd);
180   SwapValue(C.cmdsize);
181   SwapValue(C.vmaddr);
182   SwapValue(C.vmsize);
183   SwapValue(C.fileoff);
184   SwapValue(C.filesize);
185   SwapValue(C.maxprot);
186   SwapValue(C.initprot);
187   SwapValue(C.nsects);
188   SwapValue(C.flags);
189 }
190 
191 template<>
192 void SwapStruct(MachO::segment_command_64 &C) {
193   SwapValue(C.cmd);
194   SwapValue(C.cmdsize);
195   SwapValue(C.vmaddr);
196   SwapValue(C.vmsize);
197   SwapValue(C.fileoff);
198   SwapValue(C.filesize);
199   SwapValue(C.maxprot);
200   SwapValue(C.initprot);
201   SwapValue(C.nsects);
202   SwapValue(C.flags);
203 }
204 
205 template<>
206 void SwapStruct(uint32_t &C) {
207   SwapValue(C);
208 }
209 
210 template<>
211 void SwapStruct(MachO::linker_options_command &C) {
212   SwapValue(C.cmd);
213   SwapValue(C.cmdsize);
214   SwapValue(C.count);
215 }
216 
217 template<>
218 void SwapStruct(MachO::version_min_command&C) {
219   SwapValue(C.cmd);
220   SwapValue(C.cmdsize);
221   SwapValue(C.version);
222   SwapValue(C.reserved);
223 }
224 
225 template<>
226 void SwapStruct(MachO::data_in_code_entry &C) {
227   SwapValue(C.offset);
228   SwapValue(C.length);
229   SwapValue(C.kind);
230 }
231 
232 template<typename T>
233 T getStruct(const MachOObjectFile *O, const char *P) {
234   T Cmd;
235   memcpy(&Cmd, P, sizeof(T));
236   if (O->isLittleEndian() != sys::IsLittleEndianHost)
237     SwapStruct(Cmd);
238   return Cmd;
239 }
240 
241 static uint32_t
242 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
243                                  const MachOObjectFile::LoadCommandInfo &L) {
244   if (O->is64Bit()) {
245     MachO::segment_command_64 S = O->getSegment64LoadCommand(L);
246     return S.nsects;
247   }
248   MachO::segment_command S = O->getSegmentLoadCommand(L);
249   return S.nsects;
250 }
251 
252 static const char *
253 getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
254               unsigned Sec) {
255   uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
256 
257   bool Is64 = O->is64Bit();
258   unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
259                                     sizeof(MachO::segment_command);
260   unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
261                                 sizeof(MachO::section);
262 
263   uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
264   return reinterpret_cast<const char*>(SectionAddr);
265 }
266 
267 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
268   return O->getData().substr(Offset, 1).data();
269 }
270 
271 static nlist_base
272 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
273   const char *P = reinterpret_cast<const char *>(DRI.p);
274   return getStruct<nlist_base>(O, P);
275 }
276 
277 static StringRef parseSegmentOrSectionName(const char *P) {
278   if (P[15] == 0)
279     // Null terminated.
280     return P;
281   // Not null terminated, so this is a 16 char string.
282   return StringRef(P, 16);
283 }
284 
285 // Helper to advance a section or symbol iterator multiple increments at a time.
286 template<class T>
287 static void advance(T &it, size_t Val) {
288   while (Val--)
289     ++it;
290 }
291 
292 static unsigned getCPUType(const MachOObjectFile *O) {
293   return O->getHeader().cputype;
294 }
295 
296 static void printRelocationTargetName(const MachOObjectFile *O,
297                                       const MachO::any_relocation_info &RE,
298                                       raw_string_ostream &fmt) {
299   bool IsScattered = O->isRelocationScattered(RE);
300 
301   // Target of a scattered relocation is an address.  In the interest of
302   // generating pretty output, scan through the symbol table looking for a
303   // symbol that aligns with that address.  If we find one, print it.
304   // Otherwise, we just print the hex address of the target.
305   if (IsScattered) {
306     uint32_t Val = O->getPlainRelocationSymbolNum(RE);
307 
308     for (const SymbolRef &Symbol : O->symbols()) {
309       error_code ec;
310       uint64_t Addr;
311       StringRef Name;
312 
313       if ((ec = Symbol.getAddress(Addr)))
314         report_fatal_error(ec.message());
315       if (Addr != Val)
316         continue;
317       if ((ec = Symbol.getName(Name)))
318         report_fatal_error(ec.message());
319       fmt << Name;
320       return;
321     }
322 
323     // If we couldn't find a symbol that this relocation refers to, try
324     // to find a section beginning instead.
325     for (const SectionRef &Section : O->sections()) {
326       error_code ec;
327       uint64_t Addr;
328       StringRef Name;
329 
330       if ((ec = Section.getAddress(Addr)))
331         report_fatal_error(ec.message());
332       if (Addr != Val)
333         continue;
334       if ((ec = Section.getName(Name)))
335         report_fatal_error(ec.message());
336       fmt << Name;
337       return;
338     }
339 
340     fmt << format("0x%x", Val);
341     return;
342   }
343 
344   StringRef S;
345   bool isExtern = O->getPlainRelocationExternal(RE);
346   uint64_t Val = O->getPlainRelocationSymbolNum(RE);
347 
348   if (isExtern) {
349     symbol_iterator SI = O->symbol_begin();
350     advance(SI, Val);
351     SI->getName(S);
352   } else {
353     section_iterator SI = O->section_begin();
354     // Adjust for the fact that sections are 1-indexed.
355     advance(SI, Val - 1);
356     SI->getName(S);
357   }
358 
359   fmt << S;
360 }
361 
362 static uint32_t
363 getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
364   return RE.r_word0;
365 }
366 
367 static unsigned
368 getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
369   return RE.r_word0 & 0xffffff;
370 }
371 
372 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
373                                     const MachO::any_relocation_info &RE) {
374   if (O->isLittleEndian())
375     return (RE.r_word1 >> 24) & 1;
376   return (RE.r_word1 >> 7) & 1;
377 }
378 
379 static bool
380 getScatteredRelocationPCRel(const MachOObjectFile *O,
381                             const MachO::any_relocation_info &RE) {
382   return (RE.r_word0 >> 30) & 1;
383 }
384 
385 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
386                                          const MachO::any_relocation_info &RE) {
387   if (O->isLittleEndian())
388     return (RE.r_word1 >> 25) & 3;
389   return (RE.r_word1 >> 5) & 3;
390 }
391 
392 static unsigned
393 getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
394   return (RE.r_word0 >> 28) & 3;
395 }
396 
397 static unsigned getPlainRelocationType(const MachOObjectFile *O,
398                                        const MachO::any_relocation_info &RE) {
399   if (O->isLittleEndian())
400     return RE.r_word1 >> 28;
401   return RE.r_word1 & 0xf;
402 }
403 
404 static unsigned
405 getScatteredRelocationType(const MachO::any_relocation_info &RE) {
406   return (RE.r_word0 >> 24) & 0xf;
407 }
408 
409 static uint32_t getSectionFlags(const MachOObjectFile *O,
410                                 DataRefImpl Sec) {
411   if (O->is64Bit()) {
412     MachO::section_64 Sect = O->getSection64(Sec);
413     return Sect.flags;
414   }
415   MachO::section Sect = O->getSection(Sec);
416   return Sect.flags;
417 }
418 
419 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object, bool IsLittleEndian,
420                                  bool Is64bits, error_code &EC,
421                                  bool BufferOwned)
422     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object, BufferOwned),
423       SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
424   uint32_t LoadCommandCount = this->getHeader().ncmds;
425   MachO::LoadCommandType SegmentLoadType = is64Bit() ?
426     MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
427 
428   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
429   for (unsigned I = 0; ; ++I) {
430     if (Load.C.cmd == MachO::LC_SYMTAB) {
431       assert(!SymtabLoadCmd && "Multiple symbol tables");
432       SymtabLoadCmd = Load.Ptr;
433     } else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
434       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
435       DysymtabLoadCmd = Load.Ptr;
436     } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
437       assert(!DataInCodeLoadCmd && "Multiple data in code tables");
438       DataInCodeLoadCmd = Load.Ptr;
439     } else if (Load.C.cmd == SegmentLoadType) {
440       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
441       for (unsigned J = 0; J < NumSections; ++J) {
442         const char *Sec = getSectionPtr(this, Load, J);
443         Sections.push_back(Sec);
444       }
445     }
446 
447     if (I == LoadCommandCount - 1)
448       break;
449     else
450       Load = getNextLoadCommandInfo(Load);
451   }
452 }
453 
454 void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
455   unsigned SymbolTableEntrySize = is64Bit() ?
456     sizeof(MachO::nlist_64) :
457     sizeof(MachO::nlist);
458   Symb.p += SymbolTableEntrySize;
459 }
460 
461 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
462                                           StringRef &Res) const {
463   StringRef StringTable = getStringTableData();
464   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
465   const char *Start = &StringTable.data()[Entry.n_strx];
466   Res = StringRef(Start);
467   return object_error::success;
468 }
469 
470 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
471                                              uint64_t &Res) const {
472   if (is64Bit()) {
473     MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
474     Res = Entry.n_value;
475   } else {
476     MachO::nlist Entry = getSymbolTableEntry(Symb);
477     Res = Entry.n_value;
478   }
479   return object_error::success;
480 }
481 
482 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
483                                                uint32_t &Result) const {
484   uint32_t flags = getSymbolFlags(DRI);
485   if (flags & SymbolRef::SF_Common) {
486     nlist_base Entry = getSymbolTableEntryBase(this, DRI);
487     Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
488   } else {
489     Result = 0;
490   }
491   return object_error::success;
492 }
493 
494 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
495                                           uint64_t &Result) const {
496   uint64_t BeginOffset;
497   uint64_t EndOffset = 0;
498   uint8_t SectionIndex;
499 
500   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
501   uint64_t Value;
502   getSymbolAddress(DRI, Value);
503 
504   BeginOffset = Value;
505 
506   SectionIndex = Entry.n_sect;
507   if (!SectionIndex) {
508     uint32_t flags = getSymbolFlags(DRI);
509     if (flags & SymbolRef::SF_Common)
510       Result = Value;
511     else
512       Result = UnknownAddressOrSize;
513     return object_error::success;
514   }
515   // Unfortunately symbols are unsorted so we need to touch all
516   // symbols from load command
517   for (const SymbolRef &Symbol : symbols()) {
518     DataRefImpl DRI = Symbol.getRawDataRefImpl();
519     Entry = getSymbolTableEntryBase(this, DRI);
520     getSymbolAddress(DRI, Value);
521     if (Entry.n_sect == SectionIndex && Value > BeginOffset)
522       if (!EndOffset || Value < EndOffset)
523         EndOffset = Value;
524   }
525   if (!EndOffset) {
526     uint64_t Size;
527     DataRefImpl Sec;
528     Sec.d.a = SectionIndex-1;
529     getSectionSize(Sec, Size);
530     getSectionAddress(Sec, EndOffset);
531     EndOffset += Size;
532   }
533   Result = EndOffset - BeginOffset;
534   return object_error::success;
535 }
536 
537 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
538                                           SymbolRef::Type &Res) const {
539   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
540   uint8_t n_type = Entry.n_type;
541 
542   Res = SymbolRef::ST_Other;
543 
544   // If this is a STAB debugging symbol, we can do nothing more.
545   if (n_type & MachO::N_STAB) {
546     Res = SymbolRef::ST_Debug;
547     return object_error::success;
548   }
549 
550   switch (n_type & MachO::N_TYPE) {
551     case MachO::N_UNDF :
552       Res = SymbolRef::ST_Unknown;
553       break;
554     case MachO::N_SECT :
555       Res = SymbolRef::ST_Function;
556       break;
557   }
558   return object_error::success;
559 }
560 
561 uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
562   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
563 
564   uint8_t MachOType = Entry.n_type;
565   uint16_t MachOFlags = Entry.n_desc;
566 
567   uint32_t Result = SymbolRef::SF_None;
568 
569   if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
570     Result |= SymbolRef::SF_Undefined;
571 
572   if (MachOType & MachO::N_STAB)
573     Result |= SymbolRef::SF_FormatSpecific;
574 
575   if (MachOType & MachO::N_EXT) {
576     Result |= SymbolRef::SF_Global;
577     if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
578       uint64_t Value;
579       getSymbolAddress(DRI, Value);
580       if (Value)
581         Result |= SymbolRef::SF_Common;
582     }
583   }
584 
585   if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
586     Result |= SymbolRef::SF_Weak;
587 
588   if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
589     Result |= SymbolRef::SF_Absolute;
590 
591   return Result;
592 }
593 
594 error_code
595 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
596                                   section_iterator &Res) const {
597   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
598   uint8_t index = Entry.n_sect;
599 
600   if (index == 0) {
601     Res = section_end();
602   } else {
603     DataRefImpl DRI;
604     DRI.d.a = index - 1;
605     Res = section_iterator(SectionRef(DRI, this));
606   }
607 
608   return object_error::success;
609 }
610 
611 void MachOObjectFile::moveSectionNext(DataRefImpl &Sec) const {
612   Sec.d.a++;
613 }
614 
615 error_code
616 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
617   ArrayRef<char> Raw = getSectionRawName(Sec);
618   Result = parseSegmentOrSectionName(Raw.data());
619   return object_error::success;
620 }
621 
622 error_code
623 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
624   if (is64Bit()) {
625     MachO::section_64 Sect = getSection64(Sec);
626     Res = Sect.addr;
627   } else {
628     MachO::section Sect = getSection(Sec);
629     Res = Sect.addr;
630   }
631   return object_error::success;
632 }
633 
634 error_code
635 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
636   if (is64Bit()) {
637     MachO::section_64 Sect = getSection64(Sec);
638     Res = Sect.size;
639   } else {
640     MachO::section Sect = getSection(Sec);
641     Res = Sect.size;
642   }
643 
644   return object_error::success;
645 }
646 
647 error_code
648 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
649   uint32_t Offset;
650   uint64_t Size;
651 
652   if (is64Bit()) {
653     MachO::section_64 Sect = getSection64(Sec);
654     Offset = Sect.offset;
655     Size = Sect.size;
656   } else {
657     MachO::section Sect = getSection(Sec);
658     Offset = Sect.offset;
659     Size = Sect.size;
660   }
661 
662   Res = this->getData().substr(Offset, Size);
663   return object_error::success;
664 }
665 
666 error_code
667 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
668   uint32_t Align;
669   if (is64Bit()) {
670     MachO::section_64 Sect = getSection64(Sec);
671     Align = Sect.align;
672   } else {
673     MachO::section Sect = getSection(Sec);
674     Align = Sect.align;
675   }
676 
677   Res = uint64_t(1) << Align;
678   return object_error::success;
679 }
680 
681 error_code
682 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
683   uint32_t Flags = getSectionFlags(this, Sec);
684   Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
685   return object_error::success;
686 }
687 
688 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
689   // FIXME: Unimplemented.
690   Result = false;
691   return object_error::success;
692 }
693 
694 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
695   // FIXME: Unimplemented.
696   Result = false;
697   return object_error::success;
698 }
699 
700 error_code
701 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
702                                                bool &Result) const {
703   // FIXME: Unimplemented.
704   Result = true;
705   return object_error::success;
706 }
707 
708 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
709                                              bool &Result) const {
710   // FIXME: Unimplemented.
711   Result = false;
712   return object_error::success;
713 }
714 
715 error_code
716 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
717   uint32_t Flags = getSectionFlags(this, Sec);
718   unsigned SectionType = Flags & MachO::SECTION_TYPE;
719   Res = SectionType == MachO::S_ZEROFILL ||
720     SectionType == MachO::S_GB_ZEROFILL;
721   return object_error::success;
722 }
723 
724 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
725                                                   bool &Result) const {
726   // Consider using the code from isSectionText to look for __const sections.
727   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
728   // to use section attributes to distinguish code from data.
729 
730   // FIXME: Unimplemented.
731   Result = false;
732   return object_error::success;
733 }
734 
735 error_code
736 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
737                                        bool &Result) const {
738   SymbolRef::Type ST;
739   this->getSymbolType(Symb, ST);
740   if (ST == SymbolRef::ST_Unknown) {
741     Result = false;
742     return object_error::success;
743   }
744 
745   uint64_t SectBegin, SectEnd;
746   getSectionAddress(Sec, SectBegin);
747   getSectionSize(Sec, SectEnd);
748   SectEnd += SectBegin;
749 
750   uint64_t SymAddr;
751   getSymbolAddress(Symb, SymAddr);
752   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
753 
754   return object_error::success;
755 }
756 
757 relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
758   uint32_t Offset;
759   if (is64Bit()) {
760     MachO::section_64 Sect = getSection64(Sec);
761     Offset = Sect.reloff;
762   } else {
763     MachO::section Sect = getSection(Sec);
764     Offset = Sect.reloff;
765   }
766 
767   DataRefImpl Ret;
768   Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
769   return relocation_iterator(RelocationRef(Ret, this));
770 }
771 
772 relocation_iterator
773 MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
774   uint32_t Offset;
775   uint32_t Num;
776   if (is64Bit()) {
777     MachO::section_64 Sect = getSection64(Sec);
778     Offset = Sect.reloff;
779     Num = Sect.nreloc;
780   } else {
781     MachO::section Sect = getSection(Sec);
782     Offset = Sect.reloff;
783     Num = Sect.nreloc;
784   }
785 
786   const MachO::any_relocation_info *P =
787     reinterpret_cast<const MachO::any_relocation_info *>(getPtr(this, Offset));
788 
789   DataRefImpl Ret;
790   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
791   return relocation_iterator(RelocationRef(Ret, this));
792 }
793 
794 void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
795   const MachO::any_relocation_info *P =
796     reinterpret_cast<const MachO::any_relocation_info *>(Rel.p);
797   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
798 }
799 
800 error_code
801 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
802   report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
803 }
804 
805 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
806                                                 uint64_t &Res) const {
807   MachO::any_relocation_info RE = getRelocation(Rel);
808   Res = getAnyRelocationAddress(RE);
809   return object_error::success;
810 }
811 
812 symbol_iterator
813 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
814   MachO::any_relocation_info RE = getRelocation(Rel);
815   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
816   bool isExtern = getPlainRelocationExternal(RE);
817   if (!isExtern)
818     return symbol_end();
819 
820   MachO::symtab_command S = getSymtabLoadCommand();
821   unsigned SymbolTableEntrySize = is64Bit() ?
822     sizeof(MachO::nlist_64) :
823     sizeof(MachO::nlist);
824   uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
825   DataRefImpl Sym;
826   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
827   return symbol_iterator(SymbolRef(Sym, this));
828 }
829 
830 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
831                                               uint64_t &Res) const {
832   MachO::any_relocation_info RE = getRelocation(Rel);
833   Res = getAnyRelocationType(RE);
834   return object_error::success;
835 }
836 
837 error_code
838 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
839                                        SmallVectorImpl<char> &Result) const {
840   StringRef res;
841   uint64_t RType;
842   getRelocationType(Rel, RType);
843 
844   unsigned Arch = this->getArch();
845 
846   switch (Arch) {
847     case Triple::x86: {
848       static const char *const Table[] =  {
849         "GENERIC_RELOC_VANILLA",
850         "GENERIC_RELOC_PAIR",
851         "GENERIC_RELOC_SECTDIFF",
852         "GENERIC_RELOC_PB_LA_PTR",
853         "GENERIC_RELOC_LOCAL_SECTDIFF",
854         "GENERIC_RELOC_TLV" };
855 
856       if (RType > 5)
857         res = "Unknown";
858       else
859         res = Table[RType];
860       break;
861     }
862     case Triple::x86_64: {
863       static const char *const Table[] =  {
864         "X86_64_RELOC_UNSIGNED",
865         "X86_64_RELOC_SIGNED",
866         "X86_64_RELOC_BRANCH",
867         "X86_64_RELOC_GOT_LOAD",
868         "X86_64_RELOC_GOT",
869         "X86_64_RELOC_SUBTRACTOR",
870         "X86_64_RELOC_SIGNED_1",
871         "X86_64_RELOC_SIGNED_2",
872         "X86_64_RELOC_SIGNED_4",
873         "X86_64_RELOC_TLV" };
874 
875       if (RType > 9)
876         res = "Unknown";
877       else
878         res = Table[RType];
879       break;
880     }
881     case Triple::arm: {
882       static const char *const Table[] =  {
883         "ARM_RELOC_VANILLA",
884         "ARM_RELOC_PAIR",
885         "ARM_RELOC_SECTDIFF",
886         "ARM_RELOC_LOCAL_SECTDIFF",
887         "ARM_RELOC_PB_LA_PTR",
888         "ARM_RELOC_BR24",
889         "ARM_THUMB_RELOC_BR22",
890         "ARM_THUMB_32BIT_BRANCH",
891         "ARM_RELOC_HALF",
892         "ARM_RELOC_HALF_SECTDIFF" };
893 
894       if (RType > 9)
895         res = "Unknown";
896       else
897         res = Table[RType];
898       break;
899     }
900     case Triple::arm64:
901     case Triple::aarch64: {
902       static const char *const Table[] = {
903         "ARM64_RELOC_UNSIGNED",           "ARM64_RELOC_SUBTRACTOR",
904         "ARM64_RELOC_BRANCH26",           "ARM64_RELOC_PAGE21",
905         "ARM64_RELOC_PAGEOFF12",          "ARM64_RELOC_GOT_LOAD_PAGE21",
906         "ARM64_RELOC_GOT_LOAD_PAGEOFF12", "ARM64_RELOC_POINTER_TO_GOT",
907         "ARM64_RELOC_TLVP_LOAD_PAGE21",   "ARM64_RELOC_TLVP_LOAD_PAGEOFF12",
908         "ARM64_RELOC_ADDEND"
909       };
910 
911       if (RType >= array_lengthof(Table))
912         res = "Unknown";
913       else
914         res = Table[RType];
915       break;
916     }
917     case Triple::ppc: {
918       static const char *const Table[] =  {
919         "PPC_RELOC_VANILLA",
920         "PPC_RELOC_PAIR",
921         "PPC_RELOC_BR14",
922         "PPC_RELOC_BR24",
923         "PPC_RELOC_HI16",
924         "PPC_RELOC_LO16",
925         "PPC_RELOC_HA16",
926         "PPC_RELOC_LO14",
927         "PPC_RELOC_SECTDIFF",
928         "PPC_RELOC_PB_LA_PTR",
929         "PPC_RELOC_HI16_SECTDIFF",
930         "PPC_RELOC_LO16_SECTDIFF",
931         "PPC_RELOC_HA16_SECTDIFF",
932         "PPC_RELOC_JBSR",
933         "PPC_RELOC_LO14_SECTDIFF",
934         "PPC_RELOC_LOCAL_SECTDIFF" };
935 
936       if (RType > 15)
937         res = "Unknown";
938       else
939         res = Table[RType];
940       break;
941     }
942     case Triple::UnknownArch:
943       res = "Unknown";
944       break;
945   }
946   Result.append(res.begin(), res.end());
947   return object_error::success;
948 }
949 
950 error_code
951 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
952                                           SmallVectorImpl<char> &Result) const {
953   MachO::any_relocation_info RE = getRelocation(Rel);
954 
955   unsigned Arch = this->getArch();
956 
957   std::string fmtbuf;
958   raw_string_ostream fmt(fmtbuf);
959   unsigned Type = this->getAnyRelocationType(RE);
960   bool IsPCRel = this->getAnyRelocationPCRel(RE);
961 
962   // Determine any addends that should be displayed with the relocation.
963   // These require decoding the relocation type, which is triple-specific.
964 
965   // X86_64 has entirely custom relocation types.
966   if (Arch == Triple::x86_64) {
967     bool isPCRel = getAnyRelocationPCRel(RE);
968 
969     switch (Type) {
970       case MachO::X86_64_RELOC_GOT_LOAD:
971       case MachO::X86_64_RELOC_GOT: {
972         printRelocationTargetName(this, RE, fmt);
973         fmt << "@GOT";
974         if (isPCRel) fmt << "PCREL";
975         break;
976       }
977       case MachO::X86_64_RELOC_SUBTRACTOR: {
978         DataRefImpl RelNext = Rel;
979         RelNext.d.a++;
980         MachO::any_relocation_info RENext = getRelocation(RelNext);
981 
982         // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
983         // X86_64_RELOC_UNSIGNED.
984         // NOTE: Scattered relocations don't exist on x86_64.
985         unsigned RType = getAnyRelocationType(RENext);
986         if (RType != MachO::X86_64_RELOC_UNSIGNED)
987           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
988                              "X86_64_RELOC_SUBTRACTOR.");
989 
990         // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
991         // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
992         printRelocationTargetName(this, RENext, fmt);
993         fmt << "-";
994         printRelocationTargetName(this, RE, fmt);
995         break;
996       }
997       case MachO::X86_64_RELOC_TLV:
998         printRelocationTargetName(this, RE, fmt);
999         fmt << "@TLV";
1000         if (isPCRel) fmt << "P";
1001         break;
1002       case MachO::X86_64_RELOC_SIGNED_1:
1003         printRelocationTargetName(this, RE, fmt);
1004         fmt << "-1";
1005         break;
1006       case MachO::X86_64_RELOC_SIGNED_2:
1007         printRelocationTargetName(this, RE, fmt);
1008         fmt << "-2";
1009         break;
1010       case MachO::X86_64_RELOC_SIGNED_4:
1011         printRelocationTargetName(this, RE, fmt);
1012         fmt << "-4";
1013         break;
1014       default:
1015         printRelocationTargetName(this, RE, fmt);
1016         break;
1017     }
1018   // X86 and ARM share some relocation types in common.
1019   } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1020              Arch == Triple::ppc) {
1021     // Generic relocation types...
1022     switch (Type) {
1023       case MachO::GENERIC_RELOC_PAIR: // prints no info
1024         return object_error::success;
1025       case MachO::GENERIC_RELOC_SECTDIFF: {
1026         DataRefImpl RelNext = Rel;
1027         RelNext.d.a++;
1028         MachO::any_relocation_info RENext = getRelocation(RelNext);
1029 
1030         // X86 sect diff's must be followed by a relocation of type
1031         // GENERIC_RELOC_PAIR.
1032         unsigned RType = getAnyRelocationType(RENext);
1033 
1034         if (RType != MachO::GENERIC_RELOC_PAIR)
1035           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1036                              "GENERIC_RELOC_SECTDIFF.");
1037 
1038         printRelocationTargetName(this, RE, fmt);
1039         fmt << "-";
1040         printRelocationTargetName(this, RENext, fmt);
1041         break;
1042       }
1043     }
1044 
1045     if (Arch == Triple::x86 || Arch == Triple::ppc) {
1046       switch (Type) {
1047         case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
1048           DataRefImpl RelNext = Rel;
1049           RelNext.d.a++;
1050           MachO::any_relocation_info RENext = getRelocation(RelNext);
1051 
1052           // X86 sect diff's must be followed by a relocation of type
1053           // GENERIC_RELOC_PAIR.
1054           unsigned RType = getAnyRelocationType(RENext);
1055           if (RType != MachO::GENERIC_RELOC_PAIR)
1056             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1057                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1058 
1059           printRelocationTargetName(this, RE, fmt);
1060           fmt << "-";
1061           printRelocationTargetName(this, RENext, fmt);
1062           break;
1063         }
1064         case MachO::GENERIC_RELOC_TLV: {
1065           printRelocationTargetName(this, RE, fmt);
1066           fmt << "@TLV";
1067           if (IsPCRel) fmt << "P";
1068           break;
1069         }
1070         default:
1071           printRelocationTargetName(this, RE, fmt);
1072       }
1073     } else { // ARM-specific relocations
1074       switch (Type) {
1075         case MachO::ARM_RELOC_HALF:
1076         case MachO::ARM_RELOC_HALF_SECTDIFF: {
1077           // Half relocations steal a bit from the length field to encode
1078           // whether this is an upper16 or a lower16 relocation.
1079           bool isUpper = getAnyRelocationLength(RE) >> 1;
1080 
1081           if (isUpper)
1082             fmt << ":upper16:(";
1083           else
1084             fmt << ":lower16:(";
1085           printRelocationTargetName(this, RE, fmt);
1086 
1087           DataRefImpl RelNext = Rel;
1088           RelNext.d.a++;
1089           MachO::any_relocation_info RENext = getRelocation(RelNext);
1090 
1091           // ARM half relocs must be followed by a relocation of type
1092           // ARM_RELOC_PAIR.
1093           unsigned RType = getAnyRelocationType(RENext);
1094           if (RType != MachO::ARM_RELOC_PAIR)
1095             report_fatal_error("Expected ARM_RELOC_PAIR after "
1096                                "ARM_RELOC_HALF");
1097 
1098           // NOTE: The half of the target virtual address is stashed in the
1099           // address field of the secondary relocation, but we can't reverse
1100           // engineer the constant offset from it without decoding the movw/movt
1101           // instruction to find the other half in its immediate field.
1102 
1103           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1104           // symbol/section pointer of the follow-on relocation.
1105           if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
1106             fmt << "-";
1107             printRelocationTargetName(this, RENext, fmt);
1108           }
1109 
1110           fmt << ")";
1111           break;
1112         }
1113         default: {
1114           printRelocationTargetName(this, RE, fmt);
1115         }
1116       }
1117     }
1118   } else
1119     printRelocationTargetName(this, RE, fmt);
1120 
1121   fmt.flush();
1122   Result.append(fmtbuf.begin(), fmtbuf.end());
1123   return object_error::success;
1124 }
1125 
1126 error_code
1127 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1128   unsigned Arch = getArch();
1129   uint64_t Type;
1130   getRelocationType(Rel, Type);
1131 
1132   Result = false;
1133 
1134   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1135   // is always hidden.
1136   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1137     if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
1138   } else if (Arch == Triple::x86_64) {
1139     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1140     // an X86_64_RELOC_SUBTRACTOR.
1141     if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
1142       DataRefImpl RelPrev = Rel;
1143       RelPrev.d.a--;
1144       uint64_t PrevType;
1145       getRelocationType(RelPrev, PrevType);
1146       if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
1147         Result = true;
1148     }
1149   }
1150 
1151   return object_error::success;
1152 }
1153 
1154 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1155                                            LibraryRef &Res) const {
1156   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1157 }
1158 
1159 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1160                                            StringRef &Res) const {
1161   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1162 }
1163 
1164 basic_symbol_iterator MachOObjectFile::symbol_begin_impl() const {
1165   DataRefImpl DRI;
1166   if (!SymtabLoadCmd)
1167     return basic_symbol_iterator(SymbolRef(DRI, this));
1168 
1169   MachO::symtab_command Symtab = getSymtabLoadCommand();
1170   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
1171   return basic_symbol_iterator(SymbolRef(DRI, this));
1172 }
1173 
1174 basic_symbol_iterator MachOObjectFile::symbol_end_impl() const {
1175   DataRefImpl DRI;
1176   if (!SymtabLoadCmd)
1177     return basic_symbol_iterator(SymbolRef(DRI, this));
1178 
1179   MachO::symtab_command Symtab = getSymtabLoadCommand();
1180   unsigned SymbolTableEntrySize = is64Bit() ?
1181     sizeof(MachO::nlist_64) :
1182     sizeof(MachO::nlist);
1183   unsigned Offset = Symtab.symoff +
1184     Symtab.nsyms * SymbolTableEntrySize;
1185   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1186   return basic_symbol_iterator(SymbolRef(DRI, this));
1187 }
1188 
1189 section_iterator MachOObjectFile::section_begin() const {
1190   DataRefImpl DRI;
1191   return section_iterator(SectionRef(DRI, this));
1192 }
1193 
1194 section_iterator MachOObjectFile::section_end() const {
1195   DataRefImpl DRI;
1196   DRI.d.a = Sections.size();
1197   return section_iterator(SectionRef(DRI, this));
1198 }
1199 
1200 library_iterator MachOObjectFile::needed_library_begin() const {
1201   // TODO: implement
1202   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1203 }
1204 
1205 library_iterator MachOObjectFile::needed_library_end() const {
1206   // TODO: implement
1207   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1208 }
1209 
1210 uint8_t MachOObjectFile::getBytesInAddress() const {
1211   return is64Bit() ? 8 : 4;
1212 }
1213 
1214 StringRef MachOObjectFile::getFileFormatName() const {
1215   unsigned CPUType = getCPUType(this);
1216   if (!is64Bit()) {
1217     switch (CPUType) {
1218     case llvm::MachO::CPU_TYPE_I386:
1219       return "Mach-O 32-bit i386";
1220     case llvm::MachO::CPU_TYPE_ARM:
1221       return "Mach-O arm";
1222     case llvm::MachO::CPU_TYPE_POWERPC:
1223       return "Mach-O 32-bit ppc";
1224     default:
1225       assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
1226              "64-bit object file when we're not 64-bit?");
1227       return "Mach-O 32-bit unknown";
1228     }
1229   }
1230 
1231   // Make sure the cpu type has the correct mask.
1232   assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
1233          == llvm::MachO::CPU_ARCH_ABI64 &&
1234          "32-bit object file when we're 64-bit?");
1235 
1236   switch (CPUType) {
1237   case llvm::MachO::CPU_TYPE_X86_64:
1238     return "Mach-O 64-bit x86-64";
1239   case llvm::MachO::CPU_TYPE_ARM64:
1240     return "Mach-O arm64";
1241   case llvm::MachO::CPU_TYPE_POWERPC64:
1242     return "Mach-O 64-bit ppc64";
1243   default:
1244     return "Mach-O 64-bit unknown";
1245   }
1246 }
1247 
1248 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1249   switch (CPUType) {
1250   case llvm::MachO::CPU_TYPE_I386:
1251     return Triple::x86;
1252   case llvm::MachO::CPU_TYPE_X86_64:
1253     return Triple::x86_64;
1254   case llvm::MachO::CPU_TYPE_ARM:
1255     return Triple::arm;
1256   case llvm::MachO::CPU_TYPE_ARM64:
1257     return Triple::arm64;
1258   case llvm::MachO::CPU_TYPE_POWERPC:
1259     return Triple::ppc;
1260   case llvm::MachO::CPU_TYPE_POWERPC64:
1261     return Triple::ppc64;
1262   default:
1263     return Triple::UnknownArch;
1264   }
1265 }
1266 
1267 unsigned MachOObjectFile::getArch() const {
1268   return getArch(getCPUType(this));
1269 }
1270 
1271 StringRef MachOObjectFile::getLoadName() const {
1272   // TODO: Implement
1273   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1274 }
1275 
1276 relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
1277   DataRefImpl DRI;
1278   DRI.d.a = Index;
1279   return section_rel_begin(DRI);
1280 }
1281 
1282 relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
1283   DataRefImpl DRI;
1284   DRI.d.a = Index;
1285   return section_rel_end(DRI);
1286 }
1287 
1288 dice_iterator MachOObjectFile::begin_dices() const {
1289   DataRefImpl DRI;
1290   if (!DataInCodeLoadCmd)
1291     return dice_iterator(DiceRef(DRI, this));
1292 
1293   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1294   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
1295   return dice_iterator(DiceRef(DRI, this));
1296 }
1297 
1298 dice_iterator MachOObjectFile::end_dices() const {
1299   DataRefImpl DRI;
1300   if (!DataInCodeLoadCmd)
1301     return dice_iterator(DiceRef(DRI, this));
1302 
1303   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1304   unsigned Offset = DicLC.dataoff + DicLC.datasize;
1305   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1306   return dice_iterator(DiceRef(DRI, this));
1307 }
1308 
1309 StringRef
1310 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1311   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1312   return parseSegmentOrSectionName(Raw.data());
1313 }
1314 
1315 ArrayRef<char>
1316 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1317   const section_base *Base =
1318     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1319   return ArrayRef<char>(Base->sectname);
1320 }
1321 
1322 ArrayRef<char>
1323 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1324   const section_base *Base =
1325     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1326   return ArrayRef<char>(Base->segname);
1327 }
1328 
1329 bool
1330 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
1331   const {
1332   if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
1333     return false;
1334   return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
1335 }
1336 
1337 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1338     const MachO::any_relocation_info &RE) const {
1339   if (isLittleEndian())
1340     return RE.r_word1 & 0xffffff;
1341   return RE.r_word1 >> 8;
1342 }
1343 
1344 bool MachOObjectFile::getPlainRelocationExternal(
1345     const MachO::any_relocation_info &RE) const {
1346   if (isLittleEndian())
1347     return (RE.r_word1 >> 27) & 1;
1348   return (RE.r_word1 >> 4) & 1;
1349 }
1350 
1351 bool MachOObjectFile::getScatteredRelocationScattered(
1352     const MachO::any_relocation_info &RE) const {
1353   return RE.r_word0 >> 31;
1354 }
1355 
1356 uint32_t MachOObjectFile::getScatteredRelocationValue(
1357     const MachO::any_relocation_info &RE) const {
1358   return RE.r_word1;
1359 }
1360 
1361 unsigned MachOObjectFile::getAnyRelocationAddress(
1362     const MachO::any_relocation_info &RE) const {
1363   if (isRelocationScattered(RE))
1364     return getScatteredRelocationAddress(RE);
1365   return getPlainRelocationAddress(RE);
1366 }
1367 
1368 unsigned MachOObjectFile::getAnyRelocationPCRel(
1369     const MachO::any_relocation_info &RE) const {
1370   if (isRelocationScattered(RE))
1371     return getScatteredRelocationPCRel(this, RE);
1372   return getPlainRelocationPCRel(this, RE);
1373 }
1374 
1375 unsigned MachOObjectFile::getAnyRelocationLength(
1376     const MachO::any_relocation_info &RE) const {
1377   if (isRelocationScattered(RE))
1378     return getScatteredRelocationLength(RE);
1379   return getPlainRelocationLength(this, RE);
1380 }
1381 
1382 unsigned
1383 MachOObjectFile::getAnyRelocationType(
1384                                    const MachO::any_relocation_info &RE) const {
1385   if (isRelocationScattered(RE))
1386     return getScatteredRelocationType(RE);
1387   return getPlainRelocationType(this, RE);
1388 }
1389 
1390 SectionRef
1391 MachOObjectFile::getRelocationSection(
1392                                    const MachO::any_relocation_info &RE) const {
1393   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1394     return *section_end();
1395   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1396   DataRefImpl DRI;
1397   DRI.d.a = SecNum;
1398   return SectionRef(DRI, this);
1399 }
1400 
1401 MachOObjectFile::LoadCommandInfo
1402 MachOObjectFile::getFirstLoadCommandInfo() const {
1403   MachOObjectFile::LoadCommandInfo Load;
1404 
1405   unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
1406                                     sizeof(MachO::mach_header);
1407   Load.Ptr = getPtr(this, HeaderSize);
1408   Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
1409   return Load;
1410 }
1411 
1412 MachOObjectFile::LoadCommandInfo
1413 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1414   MachOObjectFile::LoadCommandInfo Next;
1415   Next.Ptr = L.Ptr + L.C.cmdsize;
1416   Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
1417   return Next;
1418 }
1419 
1420 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
1421   return getStruct<MachO::section>(this, Sections[DRI.d.a]);
1422 }
1423 
1424 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1425   return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
1426 }
1427 
1428 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
1429                                            unsigned Index) const {
1430   const char *Sec = getSectionPtr(this, L, Index);
1431   return getStruct<MachO::section>(this, Sec);
1432 }
1433 
1434 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1435                                                 unsigned Index) const {
1436   const char *Sec = getSectionPtr(this, L, Index);
1437   return getStruct<MachO::section_64>(this, Sec);
1438 }
1439 
1440 MachO::nlist
1441 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1442   const char *P = reinterpret_cast<const char *>(DRI.p);
1443   return getStruct<MachO::nlist>(this, P);
1444 }
1445 
1446 MachO::nlist_64
1447 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1448   const char *P = reinterpret_cast<const char *>(DRI.p);
1449   return getStruct<MachO::nlist_64>(this, P);
1450 }
1451 
1452 MachO::linkedit_data_command
1453 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
1454   return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
1455 }
1456 
1457 MachO::segment_command
1458 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1459   return getStruct<MachO::segment_command>(this, L.Ptr);
1460 }
1461 
1462 MachO::segment_command_64
1463 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1464   return getStruct<MachO::segment_command_64>(this, L.Ptr);
1465 }
1466 
1467 MachO::linker_options_command
1468 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1469   return getStruct<MachO::linker_options_command>(this, L.Ptr);
1470 }
1471 
1472 MachO::version_min_command
1473 MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const {
1474   return getStruct<MachO::version_min_command>(this, L.Ptr);
1475 }
1476 
1477 MachO::any_relocation_info
1478 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1479   const char *P = reinterpret_cast<const char *>(Rel.p);
1480   return getStruct<MachO::any_relocation_info>(this, P);
1481 }
1482 
1483 MachO::data_in_code_entry
1484 MachOObjectFile::getDice(DataRefImpl Rel) const {
1485   const char *P = reinterpret_cast<const char *>(Rel.p);
1486   return getStruct<MachO::data_in_code_entry>(this, P);
1487 }
1488 
1489 MachO::mach_header MachOObjectFile::getHeader() const {
1490   return getStruct<MachO::mach_header>(this, getPtr(this, 0));
1491 }
1492 
1493 MachO::mach_header_64 MachOObjectFile::getHeader64() const {
1494   return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
1495 }
1496 
1497 uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
1498                                              const MachO::dysymtab_command &DLC,
1499                                              unsigned Index) const {
1500   uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
1501   return getStruct<uint32_t>(this, getPtr(this, Offset));
1502 }
1503 
1504 MachO::data_in_code_entry
1505 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1506                                          unsigned Index) const {
1507   uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
1508   return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
1509 }
1510 
1511 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
1512   return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
1513 }
1514 
1515 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
1516   return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
1517 }
1518 
1519 MachO::linkedit_data_command
1520 MachOObjectFile::getDataInCodeLoadCommand() const {
1521   if (DataInCodeLoadCmd)
1522     return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
1523 
1524   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1525   MachO::linkedit_data_command Cmd;
1526   Cmd.cmd = MachO::LC_DATA_IN_CODE;
1527   Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
1528   Cmd.dataoff = 0;
1529   Cmd.datasize = 0;
1530   return Cmd;
1531 }
1532 
1533 StringRef MachOObjectFile::getStringTableData() const {
1534   MachO::symtab_command S = getSymtabLoadCommand();
1535   return getData().substr(S.stroff, S.strsize);
1536 }
1537 
1538 bool MachOObjectFile::is64Bit() const {
1539   return getType() == getMachOType(false, true) ||
1540     getType() == getMachOType(true, true);
1541 }
1542 
1543 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1544                                    SmallVectorImpl<uint64_t> &Out) const {
1545   DataExtractor extractor(ObjectFile::getData(), true, 0);
1546 
1547   uint32_t offset = Index;
1548   uint64_t data = 0;
1549   while (uint64_t delta = extractor.getULEB128(&offset)) {
1550     data += delta;
1551     Out.push_back(data);
1552   }
1553 }
1554 
1555 ErrorOr<ObjectFile *> ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer,
1556                                                         bool BufferOwned) {
1557   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1558   error_code EC;
1559   std::unique_ptr<MachOObjectFile> Ret;
1560   if (Magic == "\xFE\xED\xFA\xCE")
1561     Ret.reset(new MachOObjectFile(Buffer, false, false, EC, BufferOwned));
1562   else if (Magic == "\xCE\xFA\xED\xFE")
1563     Ret.reset(new MachOObjectFile(Buffer, true, false, EC, BufferOwned));
1564   else if (Magic == "\xFE\xED\xFA\xCF")
1565     Ret.reset(new MachOObjectFile(Buffer, false, true, EC, BufferOwned));
1566   else if (Magic == "\xCF\xFA\xED\xFE")
1567     Ret.reset(new MachOObjectFile(Buffer, true, true, EC, BufferOwned));
1568   else {
1569     delete Buffer;
1570     return object_error::parse_failed;
1571   }
1572 
1573   if (EC)
1574     return EC;
1575   return Ret.release();
1576 }
1577 
1578 } // end namespace object
1579 } // end namespace llvm
1580