xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 8bdfafd505f44b432a8f48c175903bd2548c0d17) 
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 error_code advance(T &it, size_t Val) {
279   error_code ec;
280   while (Val--) {
281     it.increment(ec);
282   }
283   return ec;
284 }
285 
286 template<class T>
287 static void advanceTo(T &it, size_t Val) {
288   if (error_code ec = advance(it, Val))
289     report_fatal_error(ec.message());
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     error_code ec;
309     for (symbol_iterator SI = O->begin_symbols(), SE = O->end_symbols();
310          SI != SE; SI.increment(ec)) {
311       if (ec) report_fatal_error(ec.message());
312 
313       uint64_t Addr;
314       StringRef Name;
315 
316       if ((ec = SI->getAddress(Addr)))
317         report_fatal_error(ec.message());
318       if (Addr != Val) continue;
319       if ((ec = SI->getName(Name)))
320         report_fatal_error(ec.message());
321       fmt << Name;
322       return;
323     }
324 
325     // If we couldn't find a symbol that this relocation refers to, try
326     // to find a section beginning instead.
327     for (section_iterator SI = O->begin_sections(), SE = O->end_sections();
328          SI != SE; SI.increment(ec)) {
329       if (ec) report_fatal_error(ec.message());
330 
331       uint64_t Addr;
332       StringRef Name;
333 
334       if ((ec = SI->getAddress(Addr)))
335         report_fatal_error(ec.message());
336       if (Addr != Val) continue;
337       if ((ec = SI->getName(Name)))
338         report_fatal_error(ec.message());
339       fmt << Name;
340       return;
341     }
342 
343     fmt << format("0x%x", Val);
344     return;
345   }
346 
347   StringRef S;
348   bool isExtern = O->getPlainRelocationExternal(RE);
349   uint64_t Val = O->getPlainRelocationSymbolNum(RE);
350 
351   if (isExtern) {
352     symbol_iterator SI = O->begin_symbols();
353     advanceTo(SI, Val);
354     SI->getName(S);
355   } else {
356     section_iterator SI = O->begin_sections();
357     // Adjust for the fact that sections are 1-indexed.
358     advanceTo(SI, Val - 1);
359     SI->getName(S);
360   }
361 
362   fmt << S;
363 }
364 
365 static uint32_t
366 getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
367   return RE.r_word0;
368 }
369 
370 static unsigned
371 getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
372   return RE.r_word0 & 0xffffff;
373 }
374 
375 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
376                                     const MachO::any_relocation_info &RE) {
377   if (O->isLittleEndian())
378     return (RE.r_word1 >> 24) & 1;
379   return (RE.r_word1 >> 7) & 1;
380 }
381 
382 static bool
383 getScatteredRelocationPCRel(const MachOObjectFile *O,
384                             const MachO::any_relocation_info &RE) {
385   return (RE.r_word0 >> 30) & 1;
386 }
387 
388 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
389                                          const MachO::any_relocation_info &RE) {
390   if (O->isLittleEndian())
391     return (RE.r_word1 >> 25) & 3;
392   return (RE.r_word1 >> 5) & 3;
393 }
394 
395 static unsigned
396 getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
397   return (RE.r_word0 >> 28) & 3;
398 }
399 
400 static unsigned getPlainRelocationType(const MachOObjectFile *O,
401                                        const MachO::any_relocation_info &RE) {
402   if (O->isLittleEndian())
403     return RE.r_word1 >> 28;
404   return RE.r_word1 & 0xf;
405 }
406 
407 static unsigned
408 getScatteredRelocationType(const MachO::any_relocation_info &RE) {
409   return (RE.r_word0 >> 24) & 0xf;
410 }
411 
412 static uint32_t getSectionFlags(const MachOObjectFile *O,
413                                 DataRefImpl Sec) {
414   if (O->is64Bit()) {
415     MachO::section_64 Sect = O->getSection64(Sec);
416     return Sect.flags;
417   }
418   MachO::section Sect = O->getSection(Sec);
419   return Sect.flags;
420 }
421 
422 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
423                                  bool IsLittleEndian, bool Is64bits,
424                                  error_code &ec)
425     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
426       SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
427   uint32_t LoadCommandCount = this->getHeader().ncmds;
428   MachO::LoadCommandType SegmentLoadType = is64Bit() ?
429     MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
430 
431   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
432   for (unsigned I = 0; ; ++I) {
433     if (Load.C.cmd == MachO::LC_SYMTAB) {
434       assert(!SymtabLoadCmd && "Multiple symbol tables");
435       SymtabLoadCmd = Load.Ptr;
436     } else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
437       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
438       DysymtabLoadCmd = Load.Ptr;
439     } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
440       assert(!DataInCodeLoadCmd && "Multiple data in code tables");
441       DataInCodeLoadCmd = Load.Ptr;
442     } else if (Load.C.cmd == SegmentLoadType) {
443       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
444       for (unsigned J = 0; J < NumSections; ++J) {
445         const char *Sec = getSectionPtr(this, Load, J);
446         Sections.push_back(Sec);
447       }
448     }
449 
450     if (I == LoadCommandCount - 1)
451       break;
452     else
453       Load = getNextLoadCommandInfo(Load);
454   }
455 }
456 
457 error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
458                                           SymbolRef &Res) const {
459   unsigned SymbolTableEntrySize = is64Bit() ?
460     sizeof(MachO::nlist_64) :
461     sizeof(MachO::nlist);
462   Symb.p += SymbolTableEntrySize;
463   Res = SymbolRef(Symb, this);
464   return object_error::success;
465 }
466 
467 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
468                                           StringRef &Res) const {
469   StringRef StringTable = getStringTableData();
470   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
471   const char *Start = &StringTable.data()[Entry.n_strx];
472   Res = StringRef(Start);
473   return object_error::success;
474 }
475 
476 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
477                                              uint64_t &Res) const {
478   if (is64Bit()) {
479     MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
480     Res = Entry.n_value;
481   } else {
482     MachO::nlist Entry = getSymbolTableEntry(Symb);
483     Res = Entry.n_value;
484   }
485   return object_error::success;
486 }
487 
488 error_code
489 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
490                                      uint64_t &Res) const {
491   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
492   getSymbolAddress(Symb, Res);
493   if (Entry.n_sect) {
494     uint64_t Delta;
495     DataRefImpl SecRel;
496     SecRel.d.a = Entry.n_sect-1;
497     if (is64Bit()) {
498       MachO::section_64 Sec = getSection64(SecRel);
499       Delta = Sec.offset - Sec.addr;
500     } else {
501       MachO::section Sec = getSection(SecRel);
502       Delta = Sec.offset - Sec.addr;
503     }
504 
505     Res += Delta;
506   }
507 
508   return object_error::success;
509 }
510 
511 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
512                                                uint32_t &Result) const {
513   uint32_t flags;
514   this->getSymbolFlags(DRI, flags);
515   if (flags & SymbolRef::SF_Common) {
516     nlist_base Entry = getSymbolTableEntryBase(this, DRI);
517     Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
518   } else {
519     Result = 0;
520   }
521   return object_error::success;
522 }
523 
524 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
525                                           uint64_t &Result) const {
526   uint64_t BeginOffset;
527   uint64_t EndOffset = 0;
528   uint8_t SectionIndex;
529 
530   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
531   uint64_t Value;
532   getSymbolAddress(DRI, Value);
533 
534   BeginOffset = Value;
535 
536   SectionIndex = Entry.n_sect;
537   if (!SectionIndex) {
538     uint32_t flags = SymbolRef::SF_None;
539     this->getSymbolFlags(DRI, flags);
540     if (flags & SymbolRef::SF_Common)
541       Result = Value;
542     else
543       Result = UnknownAddressOrSize;
544     return object_error::success;
545   }
546   // Unfortunately symbols are unsorted so we need to touch all
547   // symbols from load command
548   error_code ec;
549   for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E;
550        I.increment(ec)) {
551     DataRefImpl DRI = I->getRawDataRefImpl();
552     Entry = getSymbolTableEntryBase(this, DRI);
553     getSymbolAddress(DRI, Value);
554     if (Entry.n_sect == SectionIndex && Value > BeginOffset)
555       if (!EndOffset || Value < EndOffset)
556         EndOffset = Value;
557   }
558   if (!EndOffset) {
559     uint64_t Size;
560     DataRefImpl Sec;
561     Sec.d.a = SectionIndex-1;
562     getSectionSize(Sec, Size);
563     getSectionAddress(Sec, EndOffset);
564     EndOffset += Size;
565   }
566   Result = EndOffset - BeginOffset;
567   return object_error::success;
568 }
569 
570 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
571                                           SymbolRef::Type &Res) const {
572   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
573   uint8_t n_type = Entry.n_type;
574 
575   Res = SymbolRef::ST_Other;
576 
577   // If this is a STAB debugging symbol, we can do nothing more.
578   if (n_type & MachO::N_STAB) {
579     Res = SymbolRef::ST_Debug;
580     return object_error::success;
581   }
582 
583   switch (n_type & MachO::N_TYPE) {
584     case MachO::N_UNDF :
585       Res = SymbolRef::ST_Unknown;
586       break;
587     case MachO::N_SECT :
588       Res = SymbolRef::ST_Function;
589       break;
590   }
591   return object_error::success;
592 }
593 
594 error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
595                                                 char &Res) const {
596   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
597   uint8_t Type = Entry.n_type;
598   uint16_t Flags = Entry.n_desc;
599 
600   char Char;
601   switch (Type & MachO::N_TYPE) {
602     case MachO::N_UNDF:
603       Char = 'u';
604       break;
605     case MachO::N_ABS:
606     case MachO::N_SECT:
607       Char = 's';
608       break;
609     default:
610       Char = '?';
611       break;
612   }
613 
614   if (Flags & (MachO::N_EXT | MachO::N_PEXT))
615     Char = toupper(static_cast<unsigned char>(Char));
616   Res = Char;
617   return object_error::success;
618 }
619 
620 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
621                                            uint32_t &Result) const {
622   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
623 
624   uint8_t MachOType = Entry.n_type;
625   uint16_t MachOFlags = Entry.n_desc;
626 
627   // TODO: Correctly set SF_ThreadLocal
628   Result = SymbolRef::SF_None;
629 
630   if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
631     Result |= SymbolRef::SF_Undefined;
632 
633   if (MachOFlags & MachO::N_STAB)
634     Result |= SymbolRef::SF_FormatSpecific;
635 
636   if (MachOType & MachO::N_EXT) {
637     Result |= SymbolRef::SF_Global;
638     if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
639       uint64_t Value;
640       getSymbolAddress(DRI, Value);
641       if (Value)
642         Result |= SymbolRef::SF_Common;
643     }
644   }
645 
646   if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
647     Result |= SymbolRef::SF_Weak;
648 
649   if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
650     Result |= SymbolRef::SF_Absolute;
651 
652   return object_error::success;
653 }
654 
655 error_code
656 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
657                                   section_iterator &Res) const {
658   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
659   uint8_t index = Entry.n_sect;
660 
661   if (index == 0) {
662     Res = end_sections();
663   } else {
664     DataRefImpl DRI;
665     DRI.d.a = index - 1;
666     Res = section_iterator(SectionRef(DRI, this));
667   }
668 
669   return object_error::success;
670 }
671 
672 error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
673                                            uint64_t &Val) const {
674   report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
675 }
676 
677 error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
678                                            SectionRef &Res) const {
679   Sec.d.a++;
680   Res = SectionRef(Sec, this);
681   return object_error::success;
682 }
683 
684 error_code
685 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
686   ArrayRef<char> Raw = getSectionRawName(Sec);
687   Result = parseSegmentOrSectionName(Raw.data());
688   return object_error::success;
689 }
690 
691 error_code
692 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
693   if (is64Bit()) {
694     MachO::section_64 Sect = getSection64(Sec);
695     Res = Sect.addr;
696   } else {
697     MachO::section Sect = getSection(Sec);
698     Res = Sect.addr;
699   }
700   return object_error::success;
701 }
702 
703 error_code
704 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
705   if (is64Bit()) {
706     MachO::section_64 Sect = getSection64(Sec);
707     Res = Sect.size;
708   } else {
709     MachO::section Sect = getSection(Sec);
710     Res = Sect.size;
711   }
712 
713   return object_error::success;
714 }
715 
716 error_code
717 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
718   uint32_t Offset;
719   uint64_t Size;
720 
721   if (is64Bit()) {
722     MachO::section_64 Sect = getSection64(Sec);
723     Offset = Sect.offset;
724     Size = Sect.size;
725   } else {
726     MachO::section Sect = getSection(Sec);
727     Offset = Sect.offset;
728     Size = Sect.size;
729   }
730 
731   Res = this->getData().substr(Offset, Size);
732   return object_error::success;
733 }
734 
735 error_code
736 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
737   uint32_t Align;
738   if (is64Bit()) {
739     MachO::section_64 Sect = getSection64(Sec);
740     Align = Sect.align;
741   } else {
742     MachO::section Sect = getSection(Sec);
743     Align = Sect.align;
744   }
745 
746   Res = uint64_t(1) << Align;
747   return object_error::success;
748 }
749 
750 error_code
751 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
752   uint32_t Flags = getSectionFlags(this, Sec);
753   Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
754   return object_error::success;
755 }
756 
757 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
758   // FIXME: Unimplemented.
759   Result = false;
760   return object_error::success;
761 }
762 
763 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
764   // FIXME: Unimplemented.
765   Result = false;
766   return object_error::success;
767 }
768 
769 error_code
770 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
771                                                bool &Result) const {
772   // FIXME: Unimplemented.
773   Result = true;
774   return object_error::success;
775 }
776 
777 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
778                                              bool &Result) const {
779   // FIXME: Unimplemented.
780   Result = false;
781   return object_error::success;
782 }
783 
784 error_code
785 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
786   uint32_t Flags = getSectionFlags(this, Sec);
787   unsigned SectionType = Flags & MachO::SECTION_TYPE;
788   Res = SectionType == MachO::S_ZEROFILL ||
789     SectionType == MachO::S_GB_ZEROFILL;
790   return object_error::success;
791 }
792 
793 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
794                                                   bool &Result) const {
795   // Consider using the code from isSectionText to look for __const sections.
796   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
797   // to use section attributes to distinguish code from data.
798 
799   // FIXME: Unimplemented.
800   Result = false;
801   return object_error::success;
802 }
803 
804 error_code
805 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
806                                        bool &Result) const {
807   SymbolRef::Type ST;
808   this->getSymbolType(Symb, ST);
809   if (ST == SymbolRef::ST_Unknown) {
810     Result = false;
811     return object_error::success;
812   }
813 
814   uint64_t SectBegin, SectEnd;
815   getSectionAddress(Sec, SectBegin);
816   getSectionSize(Sec, SectEnd);
817   SectEnd += SectBegin;
818 
819   uint64_t SymAddr;
820   getSymbolAddress(Symb, SymAddr);
821   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
822 
823   return object_error::success;
824 }
825 
826 relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
827   uint32_t Offset;
828   if (is64Bit()) {
829     MachO::section_64 Sect = getSection64(Sec);
830     Offset = Sect.reloff;
831   } else {
832     MachO::section Sect = getSection(Sec);
833     Offset = Sect.reloff;
834   }
835 
836   DataRefImpl Ret;
837   Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
838   return relocation_iterator(RelocationRef(Ret, this));
839 }
840 
841 relocation_iterator
842 MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
843   uint32_t Offset;
844   uint32_t Num;
845   if (is64Bit()) {
846     MachO::section_64 Sect = getSection64(Sec);
847     Offset = Sect.reloff;
848     Num = Sect.nreloc;
849   } else {
850     MachO::section Sect = getSection(Sec);
851     Offset = Sect.reloff;
852     Num = Sect.nreloc;
853   }
854 
855   const MachO::any_relocation_info *P =
856     reinterpret_cast<const MachO::any_relocation_info *>(getPtr(this, Offset));
857 
858   DataRefImpl Ret;
859   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
860   return relocation_iterator(RelocationRef(Ret, this));
861 }
862 
863 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
864                                               RelocationRef &Res) const {
865   const MachO::any_relocation_info *P =
866     reinterpret_cast<const MachO::any_relocation_info *>(Rel.p);
867   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
868   Res = RelocationRef(Rel, this);
869   return object_error::success;
870 }
871 
872 error_code
873 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
874   report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
875 }
876 
877 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
878                                                 uint64_t &Res) const {
879   MachO::any_relocation_info RE = getRelocation(Rel);
880   Res = getAnyRelocationAddress(RE);
881   return object_error::success;
882 }
883 
884 symbol_iterator
885 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
886   MachO::any_relocation_info RE = getRelocation(Rel);
887   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
888   bool isExtern = getPlainRelocationExternal(RE);
889   if (!isExtern)
890     return end_symbols();
891 
892   MachO::symtab_command S = getSymtabLoadCommand();
893   unsigned SymbolTableEntrySize = is64Bit() ?
894     sizeof(MachO::nlist_64) :
895     sizeof(MachO::nlist);
896   uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
897   DataRefImpl Sym;
898   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
899   return symbol_iterator(SymbolRef(Sym, this));
900 }
901 
902 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
903                                               uint64_t &Res) const {
904   MachO::any_relocation_info RE = getRelocation(Rel);
905   Res = getAnyRelocationType(RE);
906   return object_error::success;
907 }
908 
909 error_code
910 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
911                                        SmallVectorImpl<char> &Result) const {
912   StringRef res;
913   uint64_t RType;
914   getRelocationType(Rel, RType);
915 
916   unsigned Arch = this->getArch();
917 
918   switch (Arch) {
919     case Triple::x86: {
920       static const char *const Table[] =  {
921         "GENERIC_RELOC_VANILLA",
922         "GENERIC_RELOC_PAIR",
923         "GENERIC_RELOC_SECTDIFF",
924         "GENERIC_RELOC_PB_LA_PTR",
925         "GENERIC_RELOC_LOCAL_SECTDIFF",
926         "GENERIC_RELOC_TLV" };
927 
928       if (RType > 6)
929         res = "Unknown";
930       else
931         res = Table[RType];
932       break;
933     }
934     case Triple::x86_64: {
935       static const char *const Table[] =  {
936         "X86_64_RELOC_UNSIGNED",
937         "X86_64_RELOC_SIGNED",
938         "X86_64_RELOC_BRANCH",
939         "X86_64_RELOC_GOT_LOAD",
940         "X86_64_RELOC_GOT",
941         "X86_64_RELOC_SUBTRACTOR",
942         "X86_64_RELOC_SIGNED_1",
943         "X86_64_RELOC_SIGNED_2",
944         "X86_64_RELOC_SIGNED_4",
945         "X86_64_RELOC_TLV" };
946 
947       if (RType > 9)
948         res = "Unknown";
949       else
950         res = Table[RType];
951       break;
952     }
953     case Triple::arm: {
954       static const char *const Table[] =  {
955         "ARM_RELOC_VANILLA",
956         "ARM_RELOC_PAIR",
957         "ARM_RELOC_SECTDIFF",
958         "ARM_RELOC_LOCAL_SECTDIFF",
959         "ARM_RELOC_PB_LA_PTR",
960         "ARM_RELOC_BR24",
961         "ARM_THUMB_RELOC_BR22",
962         "ARM_THUMB_32BIT_BRANCH",
963         "ARM_RELOC_HALF",
964         "ARM_RELOC_HALF_SECTDIFF" };
965 
966       if (RType > 9)
967         res = "Unknown";
968       else
969         res = Table[RType];
970       break;
971     }
972     case Triple::ppc: {
973       static const char *const Table[] =  {
974         "PPC_RELOC_VANILLA",
975         "PPC_RELOC_PAIR",
976         "PPC_RELOC_BR14",
977         "PPC_RELOC_BR24",
978         "PPC_RELOC_HI16",
979         "PPC_RELOC_LO16",
980         "PPC_RELOC_HA16",
981         "PPC_RELOC_LO14",
982         "PPC_RELOC_SECTDIFF",
983         "PPC_RELOC_PB_LA_PTR",
984         "PPC_RELOC_HI16_SECTDIFF",
985         "PPC_RELOC_LO16_SECTDIFF",
986         "PPC_RELOC_HA16_SECTDIFF",
987         "PPC_RELOC_JBSR",
988         "PPC_RELOC_LO14_SECTDIFF",
989         "PPC_RELOC_LOCAL_SECTDIFF" };
990 
991       res = Table[RType];
992       break;
993     }
994     case Triple::UnknownArch:
995       res = "Unknown";
996       break;
997   }
998   Result.append(res.begin(), res.end());
999   return object_error::success;
1000 }
1001 
1002 error_code
1003 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
1004                                           SmallVectorImpl<char> &Result) const {
1005   MachO::any_relocation_info RE = getRelocation(Rel);
1006 
1007   unsigned Arch = this->getArch();
1008 
1009   std::string fmtbuf;
1010   raw_string_ostream fmt(fmtbuf);
1011   unsigned Type = this->getAnyRelocationType(RE);
1012   bool IsPCRel = this->getAnyRelocationPCRel(RE);
1013 
1014   // Determine any addends that should be displayed with the relocation.
1015   // These require decoding the relocation type, which is triple-specific.
1016 
1017   // X86_64 has entirely custom relocation types.
1018   if (Arch == Triple::x86_64) {
1019     bool isPCRel = getAnyRelocationPCRel(RE);
1020 
1021     switch (Type) {
1022       case MachO::X86_64_RELOC_GOT_LOAD:
1023       case MachO::X86_64_RELOC_GOT: {
1024         printRelocationTargetName(this, RE, fmt);
1025         fmt << "@GOT";
1026         if (isPCRel) fmt << "PCREL";
1027         break;
1028       }
1029       case MachO::X86_64_RELOC_SUBTRACTOR: {
1030         DataRefImpl RelNext = Rel;
1031         RelNext.d.a++;
1032         MachO::any_relocation_info RENext = getRelocation(RelNext);
1033 
1034         // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
1035         // X86_64_RELOC_UNSIGNED.
1036         // NOTE: Scattered relocations don't exist on x86_64.
1037         unsigned RType = getAnyRelocationType(RENext);
1038         if (RType != MachO::X86_64_RELOC_UNSIGNED)
1039           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1040                              "X86_64_RELOC_SUBTRACTOR.");
1041 
1042         // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
1043         // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
1044         printRelocationTargetName(this, RENext, fmt);
1045         fmt << "-";
1046         printRelocationTargetName(this, RE, fmt);
1047         break;
1048       }
1049       case MachO::X86_64_RELOC_TLV:
1050         printRelocationTargetName(this, RE, fmt);
1051         fmt << "@TLV";
1052         if (isPCRel) fmt << "P";
1053         break;
1054       case MachO::X86_64_RELOC_SIGNED_1:
1055         printRelocationTargetName(this, RE, fmt);
1056         fmt << "-1";
1057         break;
1058       case MachO::X86_64_RELOC_SIGNED_2:
1059         printRelocationTargetName(this, RE, fmt);
1060         fmt << "-2";
1061         break;
1062       case MachO::X86_64_RELOC_SIGNED_4:
1063         printRelocationTargetName(this, RE, fmt);
1064         fmt << "-4";
1065         break;
1066       default:
1067         printRelocationTargetName(this, RE, fmt);
1068         break;
1069     }
1070   // X86 and ARM share some relocation types in common.
1071   } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1072              Arch == Triple::ppc) {
1073     // Generic relocation types...
1074     switch (Type) {
1075       case MachO::GENERIC_RELOC_PAIR: // prints no info
1076         return object_error::success;
1077       case MachO::GENERIC_RELOC_SECTDIFF: {
1078         DataRefImpl RelNext = Rel;
1079         RelNext.d.a++;
1080         MachO::any_relocation_info RENext = getRelocation(RelNext);
1081 
1082         // X86 sect diff's must be followed by a relocation of type
1083         // GENERIC_RELOC_PAIR.
1084         unsigned RType = getAnyRelocationType(RENext);
1085 
1086         if (RType != MachO::GENERIC_RELOC_PAIR)
1087           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1088                              "GENERIC_RELOC_SECTDIFF.");
1089 
1090         printRelocationTargetName(this, RE, fmt);
1091         fmt << "-";
1092         printRelocationTargetName(this, RENext, fmt);
1093         break;
1094       }
1095     }
1096 
1097     if (Arch == Triple::x86 || Arch == Triple::ppc) {
1098       switch (Type) {
1099         case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
1100           DataRefImpl RelNext = Rel;
1101           RelNext.d.a++;
1102           MachO::any_relocation_info RENext = getRelocation(RelNext);
1103 
1104           // X86 sect diff's must be followed by a relocation of type
1105           // GENERIC_RELOC_PAIR.
1106           unsigned RType = getAnyRelocationType(RENext);
1107           if (RType != MachO::GENERIC_RELOC_PAIR)
1108             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1109                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1110 
1111           printRelocationTargetName(this, RE, fmt);
1112           fmt << "-";
1113           printRelocationTargetName(this, RENext, fmt);
1114           break;
1115         }
1116         case MachO::GENERIC_RELOC_TLV: {
1117           printRelocationTargetName(this, RE, fmt);
1118           fmt << "@TLV";
1119           if (IsPCRel) fmt << "P";
1120           break;
1121         }
1122         default:
1123           printRelocationTargetName(this, RE, fmt);
1124       }
1125     } else { // ARM-specific relocations
1126       switch (Type) {
1127         case MachO::ARM_RELOC_HALF:
1128         case MachO::ARM_RELOC_HALF_SECTDIFF: {
1129           // Half relocations steal a bit from the length field to encode
1130           // whether this is an upper16 or a lower16 relocation.
1131           bool isUpper = getAnyRelocationLength(RE) >> 1;
1132 
1133           if (isUpper)
1134             fmt << ":upper16:(";
1135           else
1136             fmt << ":lower16:(";
1137           printRelocationTargetName(this, RE, fmt);
1138 
1139           DataRefImpl RelNext = Rel;
1140           RelNext.d.a++;
1141           MachO::any_relocation_info RENext = getRelocation(RelNext);
1142 
1143           // ARM half relocs must be followed by a relocation of type
1144           // ARM_RELOC_PAIR.
1145           unsigned RType = getAnyRelocationType(RENext);
1146           if (RType != MachO::ARM_RELOC_PAIR)
1147             report_fatal_error("Expected ARM_RELOC_PAIR after "
1148                                "ARM_RELOC_HALF");
1149 
1150           // NOTE: The half of the target virtual address is stashed in the
1151           // address field of the secondary relocation, but we can't reverse
1152           // engineer the constant offset from it without decoding the movw/movt
1153           // instruction to find the other half in its immediate field.
1154 
1155           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1156           // symbol/section pointer of the follow-on relocation.
1157           if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
1158             fmt << "-";
1159             printRelocationTargetName(this, RENext, fmt);
1160           }
1161 
1162           fmt << ")";
1163           break;
1164         }
1165         default: {
1166           printRelocationTargetName(this, RE, fmt);
1167         }
1168       }
1169     }
1170   } else
1171     printRelocationTargetName(this, RE, fmt);
1172 
1173   fmt.flush();
1174   Result.append(fmtbuf.begin(), fmtbuf.end());
1175   return object_error::success;
1176 }
1177 
1178 error_code
1179 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1180   unsigned Arch = getArch();
1181   uint64_t Type;
1182   getRelocationType(Rel, Type);
1183 
1184   Result = false;
1185 
1186   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1187   // is always hidden.
1188   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1189     if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
1190   } else if (Arch == Triple::x86_64) {
1191     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1192     // an X86_64_RELOC_SUBTRACTOR.
1193     if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
1194       DataRefImpl RelPrev = Rel;
1195       RelPrev.d.a--;
1196       uint64_t PrevType;
1197       getRelocationType(RelPrev, PrevType);
1198       if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
1199         Result = true;
1200     }
1201   }
1202 
1203   return object_error::success;
1204 }
1205 
1206 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1207                                            LibraryRef &Res) const {
1208   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1209 }
1210 
1211 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1212                                            StringRef &Res) const {
1213   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1214 }
1215 
1216 symbol_iterator MachOObjectFile::begin_symbols() const {
1217   DataRefImpl DRI;
1218   if (!SymtabLoadCmd)
1219     return symbol_iterator(SymbolRef(DRI, this));
1220 
1221   MachO::symtab_command Symtab = getSymtabLoadCommand();
1222   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
1223   return symbol_iterator(SymbolRef(DRI, this));
1224 }
1225 
1226 symbol_iterator MachOObjectFile::end_symbols() const {
1227   DataRefImpl DRI;
1228   if (!SymtabLoadCmd)
1229     return symbol_iterator(SymbolRef(DRI, this));
1230 
1231   MachO::symtab_command Symtab = getSymtabLoadCommand();
1232   unsigned SymbolTableEntrySize = is64Bit() ?
1233     sizeof(MachO::nlist_64) :
1234     sizeof(MachO::nlist);
1235   unsigned Offset = Symtab.symoff +
1236     Symtab.nsyms * SymbolTableEntrySize;
1237   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1238   return symbol_iterator(SymbolRef(DRI, this));
1239 }
1240 
1241 symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
1242   // TODO: implement
1243   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1244 }
1245 
1246 symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
1247   // TODO: implement
1248   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1249 }
1250 
1251 section_iterator MachOObjectFile::begin_sections() const {
1252   DataRefImpl DRI;
1253   return section_iterator(SectionRef(DRI, this));
1254 }
1255 
1256 section_iterator MachOObjectFile::end_sections() const {
1257   DataRefImpl DRI;
1258   DRI.d.a = Sections.size();
1259   return section_iterator(SectionRef(DRI, this));
1260 }
1261 
1262 library_iterator MachOObjectFile::begin_libraries_needed() const {
1263   // TODO: implement
1264   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1265 }
1266 
1267 library_iterator MachOObjectFile::end_libraries_needed() const {
1268   // TODO: implement
1269   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1270 }
1271 
1272 uint8_t MachOObjectFile::getBytesInAddress() const {
1273   return is64Bit() ? 8 : 4;
1274 }
1275 
1276 StringRef MachOObjectFile::getFileFormatName() const {
1277   unsigned CPUType = getCPUType(this);
1278   if (!is64Bit()) {
1279     switch (CPUType) {
1280     case llvm::MachO::CPU_TYPE_I386:
1281       return "Mach-O 32-bit i386";
1282     case llvm::MachO::CPU_TYPE_ARM:
1283       return "Mach-O arm";
1284     case llvm::MachO::CPU_TYPE_POWERPC:
1285       return "Mach-O 32-bit ppc";
1286     default:
1287       assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
1288              "64-bit object file when we're not 64-bit?");
1289       return "Mach-O 32-bit unknown";
1290     }
1291   }
1292 
1293   // Make sure the cpu type has the correct mask.
1294   assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
1295          == llvm::MachO::CPU_ARCH_ABI64 &&
1296          "32-bit object file when we're 64-bit?");
1297 
1298   switch (CPUType) {
1299   case llvm::MachO::CPU_TYPE_X86_64:
1300     return "Mach-O 64-bit x86-64";
1301   case llvm::MachO::CPU_TYPE_POWERPC64:
1302     return "Mach-O 64-bit ppc64";
1303   default:
1304     return "Mach-O 64-bit unknown";
1305   }
1306 }
1307 
1308 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1309   switch (CPUType) {
1310   case llvm::MachO::CPU_TYPE_I386:
1311     return Triple::x86;
1312   case llvm::MachO::CPU_TYPE_X86_64:
1313     return Triple::x86_64;
1314   case llvm::MachO::CPU_TYPE_ARM:
1315     return Triple::arm;
1316   case llvm::MachO::CPU_TYPE_POWERPC:
1317     return Triple::ppc;
1318   case llvm::MachO::CPU_TYPE_POWERPC64:
1319     return Triple::ppc64;
1320   default:
1321     return Triple::UnknownArch;
1322   }
1323 }
1324 
1325 unsigned MachOObjectFile::getArch() const {
1326   return getArch(getCPUType(this));
1327 }
1328 
1329 StringRef MachOObjectFile::getLoadName() const {
1330   // TODO: Implement
1331   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1332 }
1333 
1334 relocation_iterator MachOObjectFile::getSectionRelBegin(unsigned Index) const {
1335   DataRefImpl DRI;
1336   DRI.d.a = Index;
1337   return getSectionRelBegin(DRI);
1338 }
1339 
1340 relocation_iterator MachOObjectFile::getSectionRelEnd(unsigned Index) const {
1341   DataRefImpl DRI;
1342   DRI.d.a = Index;
1343   return getSectionRelEnd(DRI);
1344 }
1345 
1346 dice_iterator MachOObjectFile::begin_dices() const {
1347   DataRefImpl DRI;
1348   if (!DataInCodeLoadCmd)
1349     return dice_iterator(DiceRef(DRI, this));
1350 
1351   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1352   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
1353   return dice_iterator(DiceRef(DRI, this));
1354 }
1355 
1356 dice_iterator MachOObjectFile::end_dices() const {
1357   DataRefImpl DRI;
1358   if (!DataInCodeLoadCmd)
1359     return dice_iterator(DiceRef(DRI, this));
1360 
1361   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1362   unsigned Offset = DicLC.dataoff + DicLC.datasize;
1363   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1364   return dice_iterator(DiceRef(DRI, this));
1365 }
1366 
1367 StringRef
1368 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1369   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1370   return parseSegmentOrSectionName(Raw.data());
1371 }
1372 
1373 ArrayRef<char>
1374 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1375   const section_base *Base =
1376     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1377   return ArrayRef<char>(Base->sectname);
1378 }
1379 
1380 ArrayRef<char>
1381 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1382   const section_base *Base =
1383     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1384   return ArrayRef<char>(Base->segname);
1385 }
1386 
1387 bool
1388 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
1389   const {
1390   if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
1391     return false;
1392   return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
1393 }
1394 
1395 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1396     const MachO::any_relocation_info &RE) const {
1397   if (isLittleEndian())
1398     return RE.r_word1 & 0xffffff;
1399   return RE.r_word1 >> 8;
1400 }
1401 
1402 bool MachOObjectFile::getPlainRelocationExternal(
1403     const MachO::any_relocation_info &RE) const {
1404   if (isLittleEndian())
1405     return (RE.r_word1 >> 27) & 1;
1406   return (RE.r_word1 >> 4) & 1;
1407 }
1408 
1409 bool MachOObjectFile::getScatteredRelocationScattered(
1410     const MachO::any_relocation_info &RE) const {
1411   return RE.r_word0 >> 31;
1412 }
1413 
1414 uint32_t MachOObjectFile::getScatteredRelocationValue(
1415     const MachO::any_relocation_info &RE) const {
1416   return RE.r_word1;
1417 }
1418 
1419 unsigned MachOObjectFile::getAnyRelocationAddress(
1420     const MachO::any_relocation_info &RE) const {
1421   if (isRelocationScattered(RE))
1422     return getScatteredRelocationAddress(RE);
1423   return getPlainRelocationAddress(RE);
1424 }
1425 
1426 unsigned MachOObjectFile::getAnyRelocationPCRel(
1427     const MachO::any_relocation_info &RE) const {
1428   if (isRelocationScattered(RE))
1429     return getScatteredRelocationPCRel(this, RE);
1430   return getPlainRelocationPCRel(this, RE);
1431 }
1432 
1433 unsigned MachOObjectFile::getAnyRelocationLength(
1434     const MachO::any_relocation_info &RE) const {
1435   if (isRelocationScattered(RE))
1436     return getScatteredRelocationLength(RE);
1437   return getPlainRelocationLength(this, RE);
1438 }
1439 
1440 unsigned
1441 MachOObjectFile::getAnyRelocationType(
1442                                    const MachO::any_relocation_info &RE) const {
1443   if (isRelocationScattered(RE))
1444     return getScatteredRelocationType(RE);
1445   return getPlainRelocationType(this, RE);
1446 }
1447 
1448 SectionRef
1449 MachOObjectFile::getRelocationSection(
1450                                    const MachO::any_relocation_info &RE) const {
1451   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1452     return *end_sections();
1453   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1454   DataRefImpl DRI;
1455   DRI.d.a = SecNum;
1456   return SectionRef(DRI, this);
1457 }
1458 
1459 MachOObjectFile::LoadCommandInfo
1460 MachOObjectFile::getFirstLoadCommandInfo() const {
1461   MachOObjectFile::LoadCommandInfo Load;
1462 
1463   unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
1464                                     sizeof(MachO::mach_header);
1465   Load.Ptr = getPtr(this, HeaderSize);
1466   Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
1467   return Load;
1468 }
1469 
1470 MachOObjectFile::LoadCommandInfo
1471 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1472   MachOObjectFile::LoadCommandInfo Next;
1473   Next.Ptr = L.Ptr + L.C.cmdsize;
1474   Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
1475   return Next;
1476 }
1477 
1478 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
1479   return getStruct<MachO::section>(this, Sections[DRI.d.a]);
1480 }
1481 
1482 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1483   return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
1484 }
1485 
1486 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
1487                                            unsigned Index) const {
1488   const char *Sec = getSectionPtr(this, L, Index);
1489   return getStruct<MachO::section>(this, Sec);
1490 }
1491 
1492 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1493                                                 unsigned Index) const {
1494   const char *Sec = getSectionPtr(this, L, Index);
1495   return getStruct<MachO::section_64>(this, Sec);
1496 }
1497 
1498 MachO::nlist
1499 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1500   const char *P = reinterpret_cast<const char *>(DRI.p);
1501   return getStruct<MachO::nlist>(this, P);
1502 }
1503 
1504 MachO::nlist_64
1505 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1506   const char *P = reinterpret_cast<const char *>(DRI.p);
1507   return getStruct<MachO::nlist_64>(this, P);
1508 }
1509 
1510 MachO::linkedit_data_command
1511 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
1512   return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
1513 }
1514 
1515 MachO::segment_command
1516 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1517   return getStruct<MachO::segment_command>(this, L.Ptr);
1518 }
1519 
1520 MachO::segment_command_64
1521 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1522   return getStruct<MachO::segment_command_64>(this, L.Ptr);
1523 }
1524 
1525 MachO::linker_options_command
1526 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1527   return getStruct<MachO::linker_options_command>(this, L.Ptr);
1528 }
1529 
1530 MachO::any_relocation_info
1531 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1532   const char *P = reinterpret_cast<const char *>(Rel.p);
1533   return getStruct<MachO::any_relocation_info>(this, P);
1534 }
1535 
1536 MachO::data_in_code_entry
1537 MachOObjectFile::getDice(DataRefImpl Rel) const {
1538   const char *P = reinterpret_cast<const char *>(Rel.p);
1539   return getStruct<MachO::data_in_code_entry>(this, P);
1540 }
1541 
1542 MachO::mach_header MachOObjectFile::getHeader() const {
1543   return getStruct<MachO::mach_header>(this, getPtr(this, 0));
1544 }
1545 
1546 MachO::mach_header_64 MachOObjectFile::getHeader64() const {
1547   return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
1548 }
1549 
1550 uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
1551                                              const MachO::dysymtab_command &DLC,
1552                                              unsigned Index) const {
1553   uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
1554   return getStruct<uint32_t>(this, getPtr(this, Offset));
1555 }
1556 
1557 MachO::data_in_code_entry
1558 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1559                                          unsigned Index) const {
1560   uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
1561   return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
1562 }
1563 
1564 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
1565   return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
1566 }
1567 
1568 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
1569   return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
1570 }
1571 
1572 MachO::linkedit_data_command
1573 MachOObjectFile::getDataInCodeLoadCommand() const {
1574   if (DataInCodeLoadCmd)
1575     return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
1576 
1577   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1578   MachO::linkedit_data_command Cmd;
1579   Cmd.cmd = MachO::LC_DATA_IN_CODE;
1580   Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
1581   Cmd.dataoff = 0;
1582   Cmd.datasize = 0;
1583   return Cmd;
1584 }
1585 
1586 StringRef MachOObjectFile::getStringTableData() const {
1587   MachO::symtab_command S = getSymtabLoadCommand();
1588   return getData().substr(S.stroff, S.strsize);
1589 }
1590 
1591 bool MachOObjectFile::is64Bit() const {
1592   return getType() == getMachOType(false, true) ||
1593     getType() == getMachOType(true, true);
1594 }
1595 
1596 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1597                                    SmallVectorImpl<uint64_t> &Out) const {
1598   DataExtractor extractor(ObjectFile::getData(), true, 0);
1599 
1600   uint32_t offset = Index;
1601   uint64_t data = 0;
1602   while (uint64_t delta = extractor.getULEB128(&offset)) {
1603     data += delta;
1604     Out.push_back(data);
1605   }
1606 }
1607 
1608 ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
1609   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1610   error_code ec;
1611   OwningPtr<ObjectFile> Ret;
1612   if (Magic == "\xFE\xED\xFA\xCE")
1613     Ret.reset(new MachOObjectFile(Buffer, false, false, ec));
1614   else if (Magic == "\xCE\xFA\xED\xFE")
1615     Ret.reset(new MachOObjectFile(Buffer, true, false, ec));
1616   else if (Magic == "\xFE\xED\xFA\xCF")
1617     Ret.reset(new MachOObjectFile(Buffer, false, true, ec));
1618   else if (Magic == "\xCF\xFA\xED\xFE")
1619     Ret.reset(new MachOObjectFile(Buffer, true, true, ec));
1620   else {
1621     delete Buffer;
1622     return NULL;
1623   }
1624 
1625   if (ec)
1626     return NULL;
1627   return Ret.take();
1628 }
1629 
1630 } // end namespace object
1631 } // end namespace llvm
1632