xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 196666cf5fccba4d90241c921e9e581deaf5aa55) 
1 //===- MachOObjectFile.cpp - Mach-O object file binding ---------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the MachOObjectFile class, which binds the MachOObject
11 // class to the generic ObjectFile wrapper.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "llvm/Object/MachO.h"
16 #include "llvm/ADT/Triple.h"
17 #include "llvm/Support/DataExtractor.h"
18 #include "llvm/Support/Format.h"
19 #include "llvm/Support/Host.h"
20 #include "llvm/Support/MemoryBuffer.h"
21 #include "llvm/Support/raw_ostream.h"
22 #include <cctype>
23 #include <cstring>
24 #include <limits>
25 
26 using namespace llvm;
27 using namespace object;
28 
29 namespace llvm {
30 namespace object {
31 
32 struct nlist_base {
33   uint32_t n_strx;
34   uint8_t n_type;
35   uint8_t n_sect;
36   uint16_t n_desc;
37 };
38 
39 struct section_base {
40   char sectname[16];
41   char segname[16];
42 };
43 
44 template<typename T>
45 static void SwapValue(T &Value) {
46   Value = sys::SwapByteOrder(Value);
47 }
48 
49 template<typename T>
50 static void SwapStruct(T &Value);
51 
52 template<>
53 void SwapStruct(MachO::any_relocation_info &H) {
54   SwapValue(H.r_word0);
55   SwapValue(H.r_word1);
56 }
57 
58 template<>
59 void SwapStruct(MachO::load_command &L) {
60   SwapValue(L.cmd);
61   SwapValue(L.cmdsize);
62 }
63 
64 template<>
65 void SwapStruct(nlist_base &S) {
66   SwapValue(S.n_strx);
67   SwapValue(S.n_desc);
68 }
69 
70 template<>
71 void SwapStruct(MachO::section &S) {
72   SwapValue(S.addr);
73   SwapValue(S.size);
74   SwapValue(S.offset);
75   SwapValue(S.align);
76   SwapValue(S.reloff);
77   SwapValue(S.nreloc);
78   SwapValue(S.flags);
79   SwapValue(S.reserved1);
80   SwapValue(S.reserved2);
81 }
82 
83 template<>
84 void SwapStruct(MachO::section_64 &S) {
85   SwapValue(S.addr);
86   SwapValue(S.size);
87   SwapValue(S.offset);
88   SwapValue(S.align);
89   SwapValue(S.reloff);
90   SwapValue(S.nreloc);
91   SwapValue(S.flags);
92   SwapValue(S.reserved1);
93   SwapValue(S.reserved2);
94   SwapValue(S.reserved3);
95 }
96 
97 template<>
98 void SwapStruct(MachO::nlist &S) {
99   SwapValue(S.n_strx);
100   SwapValue(S.n_desc);
101   SwapValue(S.n_value);
102 }
103 
104 template<>
105 void SwapStruct(MachO::nlist_64 &S) {
106   SwapValue(S.n_strx);
107   SwapValue(S.n_desc);
108   SwapValue(S.n_value);
109 }
110 
111 template<>
112 void SwapStruct(MachO::mach_header &H) {
113   SwapValue(H.magic);
114   SwapValue(H.cputype);
115   SwapValue(H.cpusubtype);
116   SwapValue(H.filetype);
117   SwapValue(H.ncmds);
118   SwapValue(H.sizeofcmds);
119   SwapValue(H.flags);
120 }
121 
122 template<>
123 void SwapStruct(MachO::mach_header_64 &H) {
124   SwapValue(H.magic);
125   SwapValue(H.cputype);
126   SwapValue(H.cpusubtype);
127   SwapValue(H.filetype);
128   SwapValue(H.ncmds);
129   SwapValue(H.sizeofcmds);
130   SwapValue(H.flags);
131   SwapValue(H.reserved);
132 }
133 
134 template<>
135 void SwapStruct(MachO::symtab_command &C) {
136   SwapValue(C.cmd);
137   SwapValue(C.cmdsize);
138   SwapValue(C.symoff);
139   SwapValue(C.nsyms);
140   SwapValue(C.stroff);
141   SwapValue(C.strsize);
142 }
143 
144 template<>
145 void SwapStruct(MachO::dysymtab_command &C) {
146   SwapValue(C.cmd);
147   SwapValue(C.cmdsize);
148   SwapValue(C.ilocalsym);
149   SwapValue(C.nlocalsym);
150   SwapValue(C.iextdefsym);
151   SwapValue(C.nextdefsym);
152   SwapValue(C.iundefsym);
153   SwapValue(C.nundefsym);
154   SwapValue(C.tocoff);
155   SwapValue(C.ntoc);
156   SwapValue(C.modtaboff);
157   SwapValue(C.nmodtab);
158   SwapValue(C.extrefsymoff);
159   SwapValue(C.nextrefsyms);
160   SwapValue(C.indirectsymoff);
161   SwapValue(C.nindirectsyms);
162   SwapValue(C.extreloff);
163   SwapValue(C.nextrel);
164   SwapValue(C.locreloff);
165   SwapValue(C.nlocrel);
166 }
167 
168 template<>
169 void SwapStruct(MachO::linkedit_data_command &C) {
170   SwapValue(C.cmd);
171   SwapValue(C.cmdsize);
172   SwapValue(C.dataoff);
173   SwapValue(C.datasize);
174 }
175 
176 template<>
177 void SwapStruct(MachO::segment_command &C) {
178   SwapValue(C.cmd);
179   SwapValue(C.cmdsize);
180   SwapValue(C.vmaddr);
181   SwapValue(C.vmsize);
182   SwapValue(C.fileoff);
183   SwapValue(C.filesize);
184   SwapValue(C.maxprot);
185   SwapValue(C.initprot);
186   SwapValue(C.nsects);
187   SwapValue(C.flags);
188 }
189 
190 template<>
191 void SwapStruct(MachO::segment_command_64 &C) {
192   SwapValue(C.cmd);
193   SwapValue(C.cmdsize);
194   SwapValue(C.vmaddr);
195   SwapValue(C.vmsize);
196   SwapValue(C.fileoff);
197   SwapValue(C.filesize);
198   SwapValue(C.maxprot);
199   SwapValue(C.initprot);
200   SwapValue(C.nsects);
201   SwapValue(C.flags);
202 }
203 
204 template<>
205 void SwapStruct(uint32_t &C) {
206   SwapValue(C);
207 }
208 
209 template<>
210 void SwapStruct(MachO::linker_options_command &C) {
211   SwapValue(C.cmd);
212   SwapValue(C.cmdsize);
213   SwapValue(C.count);
214 }
215 
216 template<>
217 void SwapStruct(MachO::data_in_code_entry &C) {
218   SwapValue(C.offset);
219   SwapValue(C.length);
220   SwapValue(C.kind);
221 }
222 
223 template<typename T>
224 T getStruct(const MachOObjectFile *O, const char *P) {
225   T Cmd;
226   memcpy(&Cmd, P, sizeof(T));
227   if (O->isLittleEndian() != sys::IsLittleEndianHost)
228     SwapStruct(Cmd);
229   return Cmd;
230 }
231 
232 static uint32_t
233 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
234                                  const MachOObjectFile::LoadCommandInfo &L) {
235   if (O->is64Bit()) {
236     MachO::segment_command_64 S = O->getSegment64LoadCommand(L);
237     return S.nsects;
238   }
239   MachO::segment_command S = O->getSegmentLoadCommand(L);
240   return S.nsects;
241 }
242 
243 static const char *
244 getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
245               unsigned Sec) {
246   uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
247 
248   bool Is64 = O->is64Bit();
249   unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
250                                     sizeof(MachO::segment_command);
251   unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
252                                 sizeof(MachO::section);
253 
254   uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
255   return reinterpret_cast<const char*>(SectionAddr);
256 }
257 
258 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
259   return O->getData().substr(Offset, 1).data();
260 }
261 
262 static nlist_base
263 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
264   const char *P = reinterpret_cast<const char *>(DRI.p);
265   return getStruct<nlist_base>(O, P);
266 }
267 
268 static StringRef parseSegmentOrSectionName(const char *P) {
269   if (P[15] == 0)
270     // Null terminated.
271     return P;
272   // Not null terminated, so this is a 16 char string.
273   return StringRef(P, 16);
274 }
275 
276 // Helper to advance a section or symbol iterator multiple increments at a time.
277 template<class T>
278 static void advance(T &it, size_t Val) {
279   while (Val--)
280     ++it;
281 }
282 
283 static unsigned getCPUType(const MachOObjectFile *O) {
284   return O->getHeader().cputype;
285 }
286 
287 static void printRelocationTargetName(const MachOObjectFile *O,
288                                       const MachO::any_relocation_info &RE,
289                                       raw_string_ostream &fmt) {
290   bool IsScattered = O->isRelocationScattered(RE);
291 
292   // Target of a scattered relocation is an address.  In the interest of
293   // generating pretty output, scan through the symbol table looking for a
294   // symbol that aligns with that address.  If we find one, print it.
295   // Otherwise, we just print the hex address of the target.
296   if (IsScattered) {
297     uint32_t Val = O->getPlainRelocationSymbolNum(RE);
298 
299     for (symbol_iterator SI = O->begin_symbols(), SE = O->end_symbols();
300          SI != SE; ++SI) {
301       error_code ec;
302       uint64_t Addr;
303       StringRef Name;
304 
305       if ((ec = SI->getAddress(Addr)))
306         report_fatal_error(ec.message());
307       if (Addr != Val) continue;
308       if ((ec = SI->getName(Name)))
309         report_fatal_error(ec.message());
310       fmt << Name;
311       return;
312     }
313 
314     // If we couldn't find a symbol that this relocation refers to, try
315     // to find a section beginning instead.
316     for (section_iterator SI = O->begin_sections(), SE = O->end_sections();
317          SI != SE; ++SI) {
318       error_code ec;
319       uint64_t Addr;
320       StringRef Name;
321 
322       if ((ec = SI->getAddress(Addr)))
323         report_fatal_error(ec.message());
324       if (Addr != Val) continue;
325       if ((ec = SI->getName(Name)))
326         report_fatal_error(ec.message());
327       fmt << Name;
328       return;
329     }
330 
331     fmt << format("0x%x", Val);
332     return;
333   }
334 
335   StringRef S;
336   bool isExtern = O->getPlainRelocationExternal(RE);
337   uint64_t Val = O->getPlainRelocationSymbolNum(RE);
338 
339   if (isExtern) {
340     symbol_iterator SI = O->begin_symbols();
341     advance(SI, Val);
342     SI->getName(S);
343   } else {
344     section_iterator SI = O->begin_sections();
345     // Adjust for the fact that sections are 1-indexed.
346     advance(SI, Val - 1);
347     SI->getName(S);
348   }
349 
350   fmt << S;
351 }
352 
353 static uint32_t
354 getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
355   return RE.r_word0;
356 }
357 
358 static unsigned
359 getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
360   return RE.r_word0 & 0xffffff;
361 }
362 
363 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
364                                     const MachO::any_relocation_info &RE) {
365   if (O->isLittleEndian())
366     return (RE.r_word1 >> 24) & 1;
367   return (RE.r_word1 >> 7) & 1;
368 }
369 
370 static bool
371 getScatteredRelocationPCRel(const MachOObjectFile *O,
372                             const MachO::any_relocation_info &RE) {
373   return (RE.r_word0 >> 30) & 1;
374 }
375 
376 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
377                                          const MachO::any_relocation_info &RE) {
378   if (O->isLittleEndian())
379     return (RE.r_word1 >> 25) & 3;
380   return (RE.r_word1 >> 5) & 3;
381 }
382 
383 static unsigned
384 getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
385   return (RE.r_word0 >> 28) & 3;
386 }
387 
388 static unsigned getPlainRelocationType(const MachOObjectFile *O,
389                                        const MachO::any_relocation_info &RE) {
390   if (O->isLittleEndian())
391     return RE.r_word1 >> 28;
392   return RE.r_word1 & 0xf;
393 }
394 
395 static unsigned
396 getScatteredRelocationType(const MachO::any_relocation_info &RE) {
397   return (RE.r_word0 >> 24) & 0xf;
398 }
399 
400 static uint32_t getSectionFlags(const MachOObjectFile *O,
401                                 DataRefImpl Sec) {
402   if (O->is64Bit()) {
403     MachO::section_64 Sect = O->getSection64(Sec);
404     return Sect.flags;
405   }
406   MachO::section Sect = O->getSection(Sec);
407   return Sect.flags;
408 }
409 
410 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object, bool IsLittleEndian,
411                                  bool Is64bits, error_code &EC,
412                                  bool BufferOwned)
413     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object, BufferOwned),
414       SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
415   uint32_t LoadCommandCount = this->getHeader().ncmds;
416   MachO::LoadCommandType SegmentLoadType = is64Bit() ?
417     MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
418 
419   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
420   for (unsigned I = 0; ; ++I) {
421     if (Load.C.cmd == MachO::LC_SYMTAB) {
422       assert(!SymtabLoadCmd && "Multiple symbol tables");
423       SymtabLoadCmd = Load.Ptr;
424     } else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
425       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
426       DysymtabLoadCmd = Load.Ptr;
427     } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
428       assert(!DataInCodeLoadCmd && "Multiple data in code tables");
429       DataInCodeLoadCmd = Load.Ptr;
430     } else if (Load.C.cmd == SegmentLoadType) {
431       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
432       for (unsigned J = 0; J < NumSections; ++J) {
433         const char *Sec = getSectionPtr(this, Load, J);
434         Sections.push_back(Sec);
435       }
436     }
437 
438     if (I == LoadCommandCount - 1)
439       break;
440     else
441       Load = getNextLoadCommandInfo(Load);
442   }
443 }
444 
445 void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
446   unsigned SymbolTableEntrySize = is64Bit() ?
447     sizeof(MachO::nlist_64) :
448     sizeof(MachO::nlist);
449   Symb.p += SymbolTableEntrySize;
450 }
451 
452 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
453                                           StringRef &Res) const {
454   StringRef StringTable = getStringTableData();
455   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
456   const char *Start = &StringTable.data()[Entry.n_strx];
457   Res = StringRef(Start);
458   return object_error::success;
459 }
460 
461 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
462                                              uint64_t &Res) const {
463   if (is64Bit()) {
464     MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
465     Res = Entry.n_value;
466   } else {
467     MachO::nlist Entry = getSymbolTableEntry(Symb);
468     Res = Entry.n_value;
469   }
470   return object_error::success;
471 }
472 
473 error_code
474 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
475                                      uint64_t &Res) const {
476   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
477   getSymbolAddress(Symb, Res);
478   if (Entry.n_sect) {
479     uint64_t Delta;
480     DataRefImpl SecRel;
481     SecRel.d.a = Entry.n_sect-1;
482     if (is64Bit()) {
483       MachO::section_64 Sec = getSection64(SecRel);
484       Delta = Sec.offset - Sec.addr;
485     } else {
486       MachO::section Sec = getSection(SecRel);
487       Delta = Sec.offset - Sec.addr;
488     }
489 
490     Res += Delta;
491   }
492 
493   return object_error::success;
494 }
495 
496 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
497                                                uint32_t &Result) const {
498   uint32_t flags;
499   this->getSymbolFlags(DRI, flags);
500   if (flags & SymbolRef::SF_Common) {
501     nlist_base Entry = getSymbolTableEntryBase(this, DRI);
502     Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
503   } else {
504     Result = 0;
505   }
506   return object_error::success;
507 }
508 
509 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
510                                           uint64_t &Result) const {
511   uint64_t BeginOffset;
512   uint64_t EndOffset = 0;
513   uint8_t SectionIndex;
514 
515   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
516   uint64_t Value;
517   getSymbolAddress(DRI, Value);
518 
519   BeginOffset = Value;
520 
521   SectionIndex = Entry.n_sect;
522   if (!SectionIndex) {
523     uint32_t flags = SymbolRef::SF_None;
524     this->getSymbolFlags(DRI, flags);
525     if (flags & SymbolRef::SF_Common)
526       Result = Value;
527     else
528       Result = UnknownAddressOrSize;
529     return object_error::success;
530   }
531   // Unfortunately symbols are unsorted so we need to touch all
532   // symbols from load command
533   for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E; ++I) {
534     DataRefImpl DRI = I->getRawDataRefImpl();
535     Entry = getSymbolTableEntryBase(this, DRI);
536     getSymbolAddress(DRI, Value);
537     if (Entry.n_sect == SectionIndex && Value > BeginOffset)
538       if (!EndOffset || Value < EndOffset)
539         EndOffset = Value;
540   }
541   if (!EndOffset) {
542     uint64_t Size;
543     DataRefImpl Sec;
544     Sec.d.a = SectionIndex-1;
545     getSectionSize(Sec, Size);
546     getSectionAddress(Sec, EndOffset);
547     EndOffset += Size;
548   }
549   Result = EndOffset - BeginOffset;
550   return object_error::success;
551 }
552 
553 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
554                                           SymbolRef::Type &Res) const {
555   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
556   uint8_t n_type = Entry.n_type;
557 
558   Res = SymbolRef::ST_Other;
559 
560   // If this is a STAB debugging symbol, we can do nothing more.
561   if (n_type & MachO::N_STAB) {
562     Res = SymbolRef::ST_Debug;
563     return object_error::success;
564   }
565 
566   switch (n_type & MachO::N_TYPE) {
567     case MachO::N_UNDF :
568       Res = SymbolRef::ST_Unknown;
569       break;
570     case MachO::N_SECT :
571       Res = SymbolRef::ST_Function;
572       break;
573   }
574   return object_error::success;
575 }
576 
577 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
578                                            uint32_t &Result) const {
579   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
580 
581   uint8_t MachOType = Entry.n_type;
582   uint16_t MachOFlags = Entry.n_desc;
583 
584   // TODO: Correctly set SF_ThreadLocal
585   Result = SymbolRef::SF_None;
586 
587   if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
588     Result |= SymbolRef::SF_Undefined;
589 
590   if (MachOType & MachO::N_STAB)
591     Result |= SymbolRef::SF_FormatSpecific;
592 
593   if (MachOType & MachO::N_EXT) {
594     Result |= SymbolRef::SF_Global;
595     if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
596       uint64_t Value;
597       getSymbolAddress(DRI, Value);
598       if (Value)
599         Result |= SymbolRef::SF_Common;
600     }
601   }
602 
603   if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
604     Result |= SymbolRef::SF_Weak;
605 
606   if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
607     Result |= SymbolRef::SF_Absolute;
608 
609   return object_error::success;
610 }
611 
612 error_code
613 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
614                                   section_iterator &Res) const {
615   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
616   uint8_t index = Entry.n_sect;
617 
618   if (index == 0) {
619     Res = end_sections();
620   } else {
621     DataRefImpl DRI;
622     DRI.d.a = index - 1;
623     Res = section_iterator(SectionRef(DRI, this));
624   }
625 
626   return object_error::success;
627 }
628 
629 error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
630                                            uint64_t &Val) const {
631   report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
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 void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
818   const MachO::any_relocation_info *P =
819     reinterpret_cast<const MachO::any_relocation_info *>(Rel.p);
820   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
821 }
822 
823 error_code
824 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
825   report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
826 }
827 
828 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
829                                                 uint64_t &Res) const {
830   MachO::any_relocation_info RE = getRelocation(Rel);
831   Res = getAnyRelocationAddress(RE);
832   return object_error::success;
833 }
834 
835 symbol_iterator
836 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
837   MachO::any_relocation_info RE = getRelocation(Rel);
838   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
839   bool isExtern = getPlainRelocationExternal(RE);
840   if (!isExtern)
841     return end_symbols();
842 
843   MachO::symtab_command S = getSymtabLoadCommand();
844   unsigned SymbolTableEntrySize = is64Bit() ?
845     sizeof(MachO::nlist_64) :
846     sizeof(MachO::nlist);
847   uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
848   DataRefImpl Sym;
849   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
850   return symbol_iterator(SymbolRef(Sym, this));
851 }
852 
853 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
854                                               uint64_t &Res) const {
855   MachO::any_relocation_info RE = getRelocation(Rel);
856   Res = getAnyRelocationType(RE);
857   return object_error::success;
858 }
859 
860 error_code
861 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
862                                        SmallVectorImpl<char> &Result) const {
863   StringRef res;
864   uint64_t RType;
865   getRelocationType(Rel, RType);
866 
867   unsigned Arch = this->getArch();
868 
869   switch (Arch) {
870     case Triple::x86: {
871       static const char *const Table[] =  {
872         "GENERIC_RELOC_VANILLA",
873         "GENERIC_RELOC_PAIR",
874         "GENERIC_RELOC_SECTDIFF",
875         "GENERIC_RELOC_PB_LA_PTR",
876         "GENERIC_RELOC_LOCAL_SECTDIFF",
877         "GENERIC_RELOC_TLV" };
878 
879       if (RType > 5)
880         res = "Unknown";
881       else
882         res = Table[RType];
883       break;
884     }
885     case Triple::x86_64: {
886       static const char *const Table[] =  {
887         "X86_64_RELOC_UNSIGNED",
888         "X86_64_RELOC_SIGNED",
889         "X86_64_RELOC_BRANCH",
890         "X86_64_RELOC_GOT_LOAD",
891         "X86_64_RELOC_GOT",
892         "X86_64_RELOC_SUBTRACTOR",
893         "X86_64_RELOC_SIGNED_1",
894         "X86_64_RELOC_SIGNED_2",
895         "X86_64_RELOC_SIGNED_4",
896         "X86_64_RELOC_TLV" };
897 
898       if (RType > 9)
899         res = "Unknown";
900       else
901         res = Table[RType];
902       break;
903     }
904     case Triple::arm: {
905       static const char *const Table[] =  {
906         "ARM_RELOC_VANILLA",
907         "ARM_RELOC_PAIR",
908         "ARM_RELOC_SECTDIFF",
909         "ARM_RELOC_LOCAL_SECTDIFF",
910         "ARM_RELOC_PB_LA_PTR",
911         "ARM_RELOC_BR24",
912         "ARM_THUMB_RELOC_BR22",
913         "ARM_THUMB_32BIT_BRANCH",
914         "ARM_RELOC_HALF",
915         "ARM_RELOC_HALF_SECTDIFF" };
916 
917       if (RType > 9)
918         res = "Unknown";
919       else
920         res = Table[RType];
921       break;
922     }
923     case Triple::ppc: {
924       static const char *const Table[] =  {
925         "PPC_RELOC_VANILLA",
926         "PPC_RELOC_PAIR",
927         "PPC_RELOC_BR14",
928         "PPC_RELOC_BR24",
929         "PPC_RELOC_HI16",
930         "PPC_RELOC_LO16",
931         "PPC_RELOC_HA16",
932         "PPC_RELOC_LO14",
933         "PPC_RELOC_SECTDIFF",
934         "PPC_RELOC_PB_LA_PTR",
935         "PPC_RELOC_HI16_SECTDIFF",
936         "PPC_RELOC_LO16_SECTDIFF",
937         "PPC_RELOC_HA16_SECTDIFF",
938         "PPC_RELOC_JBSR",
939         "PPC_RELOC_LO14_SECTDIFF",
940         "PPC_RELOC_LOCAL_SECTDIFF" };
941 
942       if (RType > 15)
943         res = "Unknown";
944       else
945         res = Table[RType];
946       break;
947     }
948     case Triple::UnknownArch:
949       res = "Unknown";
950       break;
951   }
952   Result.append(res.begin(), res.end());
953   return object_error::success;
954 }
955 
956 error_code
957 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
958                                           SmallVectorImpl<char> &Result) const {
959   MachO::any_relocation_info RE = getRelocation(Rel);
960 
961   unsigned Arch = this->getArch();
962 
963   std::string fmtbuf;
964   raw_string_ostream fmt(fmtbuf);
965   unsigned Type = this->getAnyRelocationType(RE);
966   bool IsPCRel = this->getAnyRelocationPCRel(RE);
967 
968   // Determine any addends that should be displayed with the relocation.
969   // These require decoding the relocation type, which is triple-specific.
970 
971   // X86_64 has entirely custom relocation types.
972   if (Arch == Triple::x86_64) {
973     bool isPCRel = getAnyRelocationPCRel(RE);
974 
975     switch (Type) {
976       case MachO::X86_64_RELOC_GOT_LOAD:
977       case MachO::X86_64_RELOC_GOT: {
978         printRelocationTargetName(this, RE, fmt);
979         fmt << "@GOT";
980         if (isPCRel) fmt << "PCREL";
981         break;
982       }
983       case MachO::X86_64_RELOC_SUBTRACTOR: {
984         DataRefImpl RelNext = Rel;
985         RelNext.d.a++;
986         MachO::any_relocation_info RENext = getRelocation(RelNext);
987 
988         // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
989         // X86_64_RELOC_UNSIGNED.
990         // NOTE: Scattered relocations don't exist on x86_64.
991         unsigned RType = getAnyRelocationType(RENext);
992         if (RType != MachO::X86_64_RELOC_UNSIGNED)
993           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
994                              "X86_64_RELOC_SUBTRACTOR.");
995 
996         // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
997         // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
998         printRelocationTargetName(this, RENext, fmt);
999         fmt << "-";
1000         printRelocationTargetName(this, RE, fmt);
1001         break;
1002       }
1003       case MachO::X86_64_RELOC_TLV:
1004         printRelocationTargetName(this, RE, fmt);
1005         fmt << "@TLV";
1006         if (isPCRel) fmt << "P";
1007         break;
1008       case MachO::X86_64_RELOC_SIGNED_1:
1009         printRelocationTargetName(this, RE, fmt);
1010         fmt << "-1";
1011         break;
1012       case MachO::X86_64_RELOC_SIGNED_2:
1013         printRelocationTargetName(this, RE, fmt);
1014         fmt << "-2";
1015         break;
1016       case MachO::X86_64_RELOC_SIGNED_4:
1017         printRelocationTargetName(this, RE, fmt);
1018         fmt << "-4";
1019         break;
1020       default:
1021         printRelocationTargetName(this, RE, fmt);
1022         break;
1023     }
1024   // X86 and ARM share some relocation types in common.
1025   } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1026              Arch == Triple::ppc) {
1027     // Generic relocation types...
1028     switch (Type) {
1029       case MachO::GENERIC_RELOC_PAIR: // prints no info
1030         return object_error::success;
1031       case MachO::GENERIC_RELOC_SECTDIFF: {
1032         DataRefImpl RelNext = Rel;
1033         RelNext.d.a++;
1034         MachO::any_relocation_info RENext = getRelocation(RelNext);
1035 
1036         // X86 sect diff's must be followed by a relocation of type
1037         // GENERIC_RELOC_PAIR.
1038         unsigned RType = getAnyRelocationType(RENext);
1039 
1040         if (RType != MachO::GENERIC_RELOC_PAIR)
1041           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1042                              "GENERIC_RELOC_SECTDIFF.");
1043 
1044         printRelocationTargetName(this, RE, fmt);
1045         fmt << "-";
1046         printRelocationTargetName(this, RENext, fmt);
1047         break;
1048       }
1049     }
1050 
1051     if (Arch == Triple::x86 || Arch == Triple::ppc) {
1052       switch (Type) {
1053         case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
1054           DataRefImpl RelNext = Rel;
1055           RelNext.d.a++;
1056           MachO::any_relocation_info RENext = getRelocation(RelNext);
1057 
1058           // X86 sect diff's must be followed by a relocation of type
1059           // GENERIC_RELOC_PAIR.
1060           unsigned RType = getAnyRelocationType(RENext);
1061           if (RType != MachO::GENERIC_RELOC_PAIR)
1062             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1063                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1064 
1065           printRelocationTargetName(this, RE, fmt);
1066           fmt << "-";
1067           printRelocationTargetName(this, RENext, fmt);
1068           break;
1069         }
1070         case MachO::GENERIC_RELOC_TLV: {
1071           printRelocationTargetName(this, RE, fmt);
1072           fmt << "@TLV";
1073           if (IsPCRel) fmt << "P";
1074           break;
1075         }
1076         default:
1077           printRelocationTargetName(this, RE, fmt);
1078       }
1079     } else { // ARM-specific relocations
1080       switch (Type) {
1081         case MachO::ARM_RELOC_HALF:
1082         case MachO::ARM_RELOC_HALF_SECTDIFF: {
1083           // Half relocations steal a bit from the length field to encode
1084           // whether this is an upper16 or a lower16 relocation.
1085           bool isUpper = getAnyRelocationLength(RE) >> 1;
1086 
1087           if (isUpper)
1088             fmt << ":upper16:(";
1089           else
1090             fmt << ":lower16:(";
1091           printRelocationTargetName(this, RE, fmt);
1092 
1093           DataRefImpl RelNext = Rel;
1094           RelNext.d.a++;
1095           MachO::any_relocation_info RENext = getRelocation(RelNext);
1096 
1097           // ARM half relocs must be followed by a relocation of type
1098           // ARM_RELOC_PAIR.
1099           unsigned RType = getAnyRelocationType(RENext);
1100           if (RType != MachO::ARM_RELOC_PAIR)
1101             report_fatal_error("Expected ARM_RELOC_PAIR after "
1102                                "ARM_RELOC_HALF");
1103 
1104           // NOTE: The half of the target virtual address is stashed in the
1105           // address field of the secondary relocation, but we can't reverse
1106           // engineer the constant offset from it without decoding the movw/movt
1107           // instruction to find the other half in its immediate field.
1108 
1109           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1110           // symbol/section pointer of the follow-on relocation.
1111           if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
1112             fmt << "-";
1113             printRelocationTargetName(this, RENext, fmt);
1114           }
1115 
1116           fmt << ")";
1117           break;
1118         }
1119         default: {
1120           printRelocationTargetName(this, RE, fmt);
1121         }
1122       }
1123     }
1124   } else
1125     printRelocationTargetName(this, RE, fmt);
1126 
1127   fmt.flush();
1128   Result.append(fmtbuf.begin(), fmtbuf.end());
1129   return object_error::success;
1130 }
1131 
1132 error_code
1133 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1134   unsigned Arch = getArch();
1135   uint64_t Type;
1136   getRelocationType(Rel, Type);
1137 
1138   Result = false;
1139 
1140   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1141   // is always hidden.
1142   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1143     if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
1144   } else if (Arch == Triple::x86_64) {
1145     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1146     // an X86_64_RELOC_SUBTRACTOR.
1147     if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
1148       DataRefImpl RelPrev = Rel;
1149       RelPrev.d.a--;
1150       uint64_t PrevType;
1151       getRelocationType(RelPrev, PrevType);
1152       if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
1153         Result = true;
1154     }
1155   }
1156 
1157   return object_error::success;
1158 }
1159 
1160 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1161                                            LibraryRef &Res) const {
1162   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1163 }
1164 
1165 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1166                                            StringRef &Res) const {
1167   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1168 }
1169 
1170 symbol_iterator MachOObjectFile::begin_symbols() const {
1171   DataRefImpl DRI;
1172   if (!SymtabLoadCmd)
1173     return symbol_iterator(SymbolRef(DRI, this));
1174 
1175   MachO::symtab_command Symtab = getSymtabLoadCommand();
1176   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
1177   return symbol_iterator(SymbolRef(DRI, this));
1178 }
1179 
1180 symbol_iterator MachOObjectFile::end_symbols() const {
1181   DataRefImpl DRI;
1182   if (!SymtabLoadCmd)
1183     return symbol_iterator(SymbolRef(DRI, this));
1184 
1185   MachO::symtab_command Symtab = getSymtabLoadCommand();
1186   unsigned SymbolTableEntrySize = is64Bit() ?
1187     sizeof(MachO::nlist_64) :
1188     sizeof(MachO::nlist);
1189   unsigned Offset = Symtab.symoff +
1190     Symtab.nsyms * SymbolTableEntrySize;
1191   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1192   return symbol_iterator(SymbolRef(DRI, this));
1193 }
1194 
1195 section_iterator MachOObjectFile::begin_sections() const {
1196   DataRefImpl DRI;
1197   return section_iterator(SectionRef(DRI, this));
1198 }
1199 
1200 section_iterator MachOObjectFile::end_sections() const {
1201   DataRefImpl DRI;
1202   DRI.d.a = Sections.size();
1203   return section_iterator(SectionRef(DRI, this));
1204 }
1205 
1206 library_iterator MachOObjectFile::begin_libraries_needed() const {
1207   // TODO: implement
1208   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1209 }
1210 
1211 library_iterator MachOObjectFile::end_libraries_needed() const {
1212   // TODO: implement
1213   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1214 }
1215 
1216 uint8_t MachOObjectFile::getBytesInAddress() const {
1217   return is64Bit() ? 8 : 4;
1218 }
1219 
1220 StringRef MachOObjectFile::getFileFormatName() const {
1221   unsigned CPUType = getCPUType(this);
1222   if (!is64Bit()) {
1223     switch (CPUType) {
1224     case llvm::MachO::CPU_TYPE_I386:
1225       return "Mach-O 32-bit i386";
1226     case llvm::MachO::CPU_TYPE_ARM:
1227       return "Mach-O arm";
1228     case llvm::MachO::CPU_TYPE_POWERPC:
1229       return "Mach-O 32-bit ppc";
1230     default:
1231       assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
1232              "64-bit object file when we're not 64-bit?");
1233       return "Mach-O 32-bit unknown";
1234     }
1235   }
1236 
1237   // Make sure the cpu type has the correct mask.
1238   assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
1239          == llvm::MachO::CPU_ARCH_ABI64 &&
1240          "32-bit object file when we're 64-bit?");
1241 
1242   switch (CPUType) {
1243   case llvm::MachO::CPU_TYPE_X86_64:
1244     return "Mach-O 64-bit x86-64";
1245   case llvm::MachO::CPU_TYPE_POWERPC64:
1246     return "Mach-O 64-bit ppc64";
1247   default:
1248     return "Mach-O 64-bit unknown";
1249   }
1250 }
1251 
1252 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1253   switch (CPUType) {
1254   case llvm::MachO::CPU_TYPE_I386:
1255     return Triple::x86;
1256   case llvm::MachO::CPU_TYPE_X86_64:
1257     return Triple::x86_64;
1258   case llvm::MachO::CPU_TYPE_ARM:
1259     return Triple::arm;
1260   case llvm::MachO::CPU_TYPE_POWERPC:
1261     return Triple::ppc;
1262   case llvm::MachO::CPU_TYPE_POWERPC64:
1263     return Triple::ppc64;
1264   default:
1265     return Triple::UnknownArch;
1266   }
1267 }
1268 
1269 unsigned MachOObjectFile::getArch() const {
1270   return getArch(getCPUType(this));
1271 }
1272 
1273 StringRef MachOObjectFile::getLoadName() const {
1274   // TODO: Implement
1275   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1276 }
1277 
1278 relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
1279   DataRefImpl DRI;
1280   DRI.d.a = Index;
1281   return section_rel_begin(DRI);
1282 }
1283 
1284 relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
1285   DataRefImpl DRI;
1286   DRI.d.a = Index;
1287   return section_rel_end(DRI);
1288 }
1289 
1290 dice_iterator MachOObjectFile::begin_dices() const {
1291   DataRefImpl DRI;
1292   if (!DataInCodeLoadCmd)
1293     return dice_iterator(DiceRef(DRI, this));
1294 
1295   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1296   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
1297   return dice_iterator(DiceRef(DRI, this));
1298 }
1299 
1300 dice_iterator MachOObjectFile::end_dices() const {
1301   DataRefImpl DRI;
1302   if (!DataInCodeLoadCmd)
1303     return dice_iterator(DiceRef(DRI, this));
1304 
1305   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1306   unsigned Offset = DicLC.dataoff + DicLC.datasize;
1307   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1308   return dice_iterator(DiceRef(DRI, this));
1309 }
1310 
1311 StringRef
1312 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1313   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1314   return parseSegmentOrSectionName(Raw.data());
1315 }
1316 
1317 ArrayRef<char>
1318 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1319   const section_base *Base =
1320     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1321   return ArrayRef<char>(Base->sectname);
1322 }
1323 
1324 ArrayRef<char>
1325 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1326   const section_base *Base =
1327     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1328   return ArrayRef<char>(Base->segname);
1329 }
1330 
1331 bool
1332 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
1333   const {
1334   if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
1335     return false;
1336   return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
1337 }
1338 
1339 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1340     const MachO::any_relocation_info &RE) const {
1341   if (isLittleEndian())
1342     return RE.r_word1 & 0xffffff;
1343   return RE.r_word1 >> 8;
1344 }
1345 
1346 bool MachOObjectFile::getPlainRelocationExternal(
1347     const MachO::any_relocation_info &RE) const {
1348   if (isLittleEndian())
1349     return (RE.r_word1 >> 27) & 1;
1350   return (RE.r_word1 >> 4) & 1;
1351 }
1352 
1353 bool MachOObjectFile::getScatteredRelocationScattered(
1354     const MachO::any_relocation_info &RE) const {
1355   return RE.r_word0 >> 31;
1356 }
1357 
1358 uint32_t MachOObjectFile::getScatteredRelocationValue(
1359     const MachO::any_relocation_info &RE) const {
1360   return RE.r_word1;
1361 }
1362 
1363 unsigned MachOObjectFile::getAnyRelocationAddress(
1364     const MachO::any_relocation_info &RE) const {
1365   if (isRelocationScattered(RE))
1366     return getScatteredRelocationAddress(RE);
1367   return getPlainRelocationAddress(RE);
1368 }
1369 
1370 unsigned MachOObjectFile::getAnyRelocationPCRel(
1371     const MachO::any_relocation_info &RE) const {
1372   if (isRelocationScattered(RE))
1373     return getScatteredRelocationPCRel(this, RE);
1374   return getPlainRelocationPCRel(this, RE);
1375 }
1376 
1377 unsigned MachOObjectFile::getAnyRelocationLength(
1378     const MachO::any_relocation_info &RE) const {
1379   if (isRelocationScattered(RE))
1380     return getScatteredRelocationLength(RE);
1381   return getPlainRelocationLength(this, RE);
1382 }
1383 
1384 unsigned
1385 MachOObjectFile::getAnyRelocationType(
1386                                    const MachO::any_relocation_info &RE) const {
1387   if (isRelocationScattered(RE))
1388     return getScatteredRelocationType(RE);
1389   return getPlainRelocationType(this, RE);
1390 }
1391 
1392 SectionRef
1393 MachOObjectFile::getRelocationSection(
1394                                    const MachO::any_relocation_info &RE) const {
1395   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1396     return *end_sections();
1397   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1398   DataRefImpl DRI;
1399   DRI.d.a = SecNum;
1400   return SectionRef(DRI, this);
1401 }
1402 
1403 MachOObjectFile::LoadCommandInfo
1404 MachOObjectFile::getFirstLoadCommandInfo() const {
1405   MachOObjectFile::LoadCommandInfo Load;
1406 
1407   unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
1408                                     sizeof(MachO::mach_header);
1409   Load.Ptr = getPtr(this, HeaderSize);
1410   Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
1411   return Load;
1412 }
1413 
1414 MachOObjectFile::LoadCommandInfo
1415 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1416   MachOObjectFile::LoadCommandInfo Next;
1417   Next.Ptr = L.Ptr + L.C.cmdsize;
1418   Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
1419   return Next;
1420 }
1421 
1422 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
1423   return getStruct<MachO::section>(this, Sections[DRI.d.a]);
1424 }
1425 
1426 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1427   return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
1428 }
1429 
1430 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
1431                                            unsigned Index) const {
1432   const char *Sec = getSectionPtr(this, L, Index);
1433   return getStruct<MachO::section>(this, Sec);
1434 }
1435 
1436 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1437                                                 unsigned Index) const {
1438   const char *Sec = getSectionPtr(this, L, Index);
1439   return getStruct<MachO::section_64>(this, Sec);
1440 }
1441 
1442 MachO::nlist
1443 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1444   const char *P = reinterpret_cast<const char *>(DRI.p);
1445   return getStruct<MachO::nlist>(this, P);
1446 }
1447 
1448 MachO::nlist_64
1449 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1450   const char *P = reinterpret_cast<const char *>(DRI.p);
1451   return getStruct<MachO::nlist_64>(this, P);
1452 }
1453 
1454 MachO::linkedit_data_command
1455 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
1456   return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
1457 }
1458 
1459 MachO::segment_command
1460 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1461   return getStruct<MachO::segment_command>(this, L.Ptr);
1462 }
1463 
1464 MachO::segment_command_64
1465 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1466   return getStruct<MachO::segment_command_64>(this, L.Ptr);
1467 }
1468 
1469 MachO::linker_options_command
1470 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1471   return getStruct<MachO::linker_options_command>(this, L.Ptr);
1472 }
1473 
1474 MachO::any_relocation_info
1475 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1476   const char *P = reinterpret_cast<const char *>(Rel.p);
1477   return getStruct<MachO::any_relocation_info>(this, P);
1478 }
1479 
1480 MachO::data_in_code_entry
1481 MachOObjectFile::getDice(DataRefImpl Rel) const {
1482   const char *P = reinterpret_cast<const char *>(Rel.p);
1483   return getStruct<MachO::data_in_code_entry>(this, P);
1484 }
1485 
1486 MachO::mach_header MachOObjectFile::getHeader() const {
1487   return getStruct<MachO::mach_header>(this, getPtr(this, 0));
1488 }
1489 
1490 MachO::mach_header_64 MachOObjectFile::getHeader64() const {
1491   return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
1492 }
1493 
1494 uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
1495                                              const MachO::dysymtab_command &DLC,
1496                                              unsigned Index) const {
1497   uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
1498   return getStruct<uint32_t>(this, getPtr(this, Offset));
1499 }
1500 
1501 MachO::data_in_code_entry
1502 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1503                                          unsigned Index) const {
1504   uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
1505   return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
1506 }
1507 
1508 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
1509   return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
1510 }
1511 
1512 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
1513   return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
1514 }
1515 
1516 MachO::linkedit_data_command
1517 MachOObjectFile::getDataInCodeLoadCommand() const {
1518   if (DataInCodeLoadCmd)
1519     return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
1520 
1521   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1522   MachO::linkedit_data_command Cmd;
1523   Cmd.cmd = MachO::LC_DATA_IN_CODE;
1524   Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
1525   Cmd.dataoff = 0;
1526   Cmd.datasize = 0;
1527   return Cmd;
1528 }
1529 
1530 StringRef MachOObjectFile::getStringTableData() const {
1531   MachO::symtab_command S = getSymtabLoadCommand();
1532   return getData().substr(S.stroff, S.strsize);
1533 }
1534 
1535 bool MachOObjectFile::is64Bit() const {
1536   return getType() == getMachOType(false, true) ||
1537     getType() == getMachOType(true, true);
1538 }
1539 
1540 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1541                                    SmallVectorImpl<uint64_t> &Out) const {
1542   DataExtractor extractor(ObjectFile::getData(), true, 0);
1543 
1544   uint32_t offset = Index;
1545   uint64_t data = 0;
1546   while (uint64_t delta = extractor.getULEB128(&offset)) {
1547     data += delta;
1548     Out.push_back(data);
1549   }
1550 }
1551 
1552 ErrorOr<ObjectFile *> ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer,
1553                                                         bool BufferOwned) {
1554   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1555   error_code EC;
1556   OwningPtr<MachOObjectFile> Ret;
1557   if (Magic == "\xFE\xED\xFA\xCE")
1558     Ret.reset(new MachOObjectFile(Buffer, false, false, EC, BufferOwned));
1559   else if (Magic == "\xCE\xFA\xED\xFE")
1560     Ret.reset(new MachOObjectFile(Buffer, true, false, EC, BufferOwned));
1561   else if (Magic == "\xFE\xED\xFA\xCF")
1562     Ret.reset(new MachOObjectFile(Buffer, false, true, EC, BufferOwned));
1563   else if (Magic == "\xCF\xFA\xED\xFE")
1564     Ret.reset(new MachOObjectFile(Buffer, true, true, EC, BufferOwned));
1565   else {
1566     delete Buffer;
1567     return object_error::parse_failed;
1568   }
1569 
1570   if (EC)
1571     return EC;
1572   return Ret.take();
1573 }
1574 
1575 } // end namespace object
1576 } // end namespace llvm
1577