xref: /llvm-project/llvm/lib/Object/MachOObjectFile.cpp (revision 6e040c0be2064154f86250eafe2fafec2c192be0) 
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/Object/MachOFormat.h"
18 #include "llvm/Support/DataExtractor.h"
19 #include "llvm/Support/Format.h"
20 #include "llvm/Support/Host.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include <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 SymbolTableEntryBase {
33   uint32_t StringIndex;
34   uint8_t Type;
35   uint8_t SectionIndex;
36   uint16_t Flags;
37 };
38 
39 struct SectionBase {
40   char Name[16];
41   char SegmentName[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::RelocationEntry &H) {
54   SwapValue(H.Word0);
55   SwapValue(H.Word1);
56 }
57 
58 template<>
59 void SwapStruct(macho::LoadCommand &L) {
60   SwapValue(L.Type);
61   SwapValue(L.Size);
62 }
63 
64 template<>
65 void SwapStruct(SymbolTableEntryBase &S) {
66   SwapValue(S.StringIndex);
67   SwapValue(S.Flags);
68 }
69 
70 template<>
71 void SwapStruct(macho::Section &S) {
72   SwapValue(S.Address);
73   SwapValue(S.Size);
74   SwapValue(S.Offset);
75   SwapValue(S.Align);
76   SwapValue(S.RelocationTableOffset);
77   SwapValue(S.NumRelocationTableEntries);
78   SwapValue(S.Flags);
79   SwapValue(S.Reserved1);
80   SwapValue(S.Reserved2);
81 }
82 
83 template<>
84 void SwapStruct(macho::Section64 &S) {
85   SwapValue(S.Address);
86   SwapValue(S.Size);
87   SwapValue(S.Offset);
88   SwapValue(S.Align);
89   SwapValue(S.RelocationTableOffset);
90   SwapValue(S.NumRelocationTableEntries);
91   SwapValue(S.Flags);
92   SwapValue(S.Reserved1);
93   SwapValue(S.Reserved2);
94   SwapValue(S.Reserved3);
95 }
96 
97 template<>
98 void SwapStruct(macho::SymbolTableEntry &S) {
99   SwapValue(S.StringIndex);
100   SwapValue(S.Flags);
101   SwapValue(S.Value);
102 }
103 
104 template<>
105 void SwapStruct(macho::Symbol64TableEntry &S) {
106   SwapValue(S.StringIndex);
107   SwapValue(S.Flags);
108   SwapValue(S.Value);
109 }
110 
111 template<>
112 void SwapStruct(macho::Header &H) {
113   SwapValue(H.Magic);
114   SwapValue(H.CPUType);
115   SwapValue(H.CPUSubtype);
116   SwapValue(H.FileType);
117   SwapValue(H.NumLoadCommands);
118   SwapValue(H.SizeOfLoadCommands);
119   SwapValue(H.Flags);
120 }
121 
122 template<>
123 void SwapStruct(macho::Header64Ext &E) {
124   SwapValue(E.Reserved);
125 }
126 
127 template<>
128 void SwapStruct(macho::SymtabLoadCommand &C) {
129   SwapValue(C.Type);
130   SwapValue(C.Size);
131   SwapValue(C.SymbolTableOffset);
132   SwapValue(C.NumSymbolTableEntries);
133   SwapValue(C.StringTableOffset);
134   SwapValue(C.StringTableSize);
135 }
136 
137 template<>
138 void SwapStruct(macho::DysymtabLoadCommand &C) {
139   SwapValue(C.Type);
140   SwapValue(C.Size);
141   SwapValue(C.LocalSymbolsIndex);
142   SwapValue(C.NumLocalSymbols);
143   SwapValue(C.ExternalSymbolsIndex);
144   SwapValue(C.NumExternalSymbols);
145   SwapValue(C.UndefinedSymbolsIndex);
146   SwapValue(C.NumUndefinedSymbols);
147   SwapValue(C.TOCOffset);
148   SwapValue(C.NumTOCEntries);
149   SwapValue(C.ModuleTableOffset);
150   SwapValue(C.NumModuleTableEntries);
151   SwapValue(C.ReferenceSymbolTableOffset);
152   SwapValue(C.NumReferencedSymbolTableEntries);
153   SwapValue(C.IndirectSymbolTableOffset);
154   SwapValue(C.NumIndirectSymbolTableEntries);
155   SwapValue(C.ExternalRelocationTableOffset);
156   SwapValue(C.NumExternalRelocationTableEntries);
157   SwapValue(C.LocalRelocationTableOffset);
158   SwapValue(C.NumLocalRelocationTableEntries);
159 }
160 
161 template<>
162 void SwapStruct(macho::LinkeditDataLoadCommand &C) {
163   SwapValue(C.Type);
164   SwapValue(C.Size);
165   SwapValue(C.DataOffset);
166   SwapValue(C.DataSize);
167 }
168 
169 template<>
170 void SwapStruct(macho::SegmentLoadCommand &C) {
171   SwapValue(C.Type);
172   SwapValue(C.Size);
173   SwapValue(C.VMAddress);
174   SwapValue(C.VMSize);
175   SwapValue(C.FileOffset);
176   SwapValue(C.FileSize);
177   SwapValue(C.MaxVMProtection);
178   SwapValue(C.InitialVMProtection);
179   SwapValue(C.NumSections);
180   SwapValue(C.Flags);
181 }
182 
183 template<>
184 void SwapStruct(macho::Segment64LoadCommand &C) {
185   SwapValue(C.Type);
186   SwapValue(C.Size);
187   SwapValue(C.VMAddress);
188   SwapValue(C.VMSize);
189   SwapValue(C.FileOffset);
190   SwapValue(C.FileSize);
191   SwapValue(C.MaxVMProtection);
192   SwapValue(C.InitialVMProtection);
193   SwapValue(C.NumSections);
194   SwapValue(C.Flags);
195 }
196 
197 template<>
198 void SwapStruct(macho::IndirectSymbolTableEntry &C) {
199   SwapValue(C.Index);
200 }
201 
202 template<>
203 void SwapStruct(macho::LinkerOptionsLoadCommand &C) {
204   SwapValue(C.Type);
205   SwapValue(C.Size);
206   SwapValue(C.Count);
207 }
208 
209 template<>
210 void SwapStruct(macho::DataInCodeTableEntry &C) {
211   SwapValue(C.Offset);
212   SwapValue(C.Length);
213   SwapValue(C.Kind);
214 }
215 
216 template<typename T>
217 T getStruct(const MachOObjectFile *O, const char *P) {
218   T Cmd;
219   memcpy(&Cmd, P, sizeof(T));
220   if (O->isLittleEndian() != sys::IsLittleEndianHost)
221     SwapStruct(Cmd);
222   return Cmd;
223 }
224 
225 static uint32_t
226 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
227                                  const MachOObjectFile::LoadCommandInfo &L) {
228   if (O->is64Bit()) {
229     macho::Segment64LoadCommand S = O->getSegment64LoadCommand(L);
230     return S.NumSections;
231   }
232   macho::SegmentLoadCommand S = O->getSegmentLoadCommand(L);
233   return S.NumSections;
234 }
235 
236 static const char *
237 getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
238               unsigned Sec) {
239   uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
240 
241   bool Is64 = O->is64Bit();
242   unsigned SegmentLoadSize = Is64 ? sizeof(macho::Segment64LoadCommand) :
243                                     sizeof(macho::SegmentLoadCommand);
244   unsigned SectionSize = Is64 ? sizeof(macho::Section64) :
245                                 sizeof(macho::Section);
246 
247   uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
248   return reinterpret_cast<const char*>(SectionAddr);
249 }
250 
251 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
252   return O->getData().substr(Offset, 1).data();
253 }
254 
255 static SymbolTableEntryBase
256 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
257   const char *P = reinterpret_cast<const char *>(DRI.p);
258   return getStruct<SymbolTableEntryBase>(O, P);
259 }
260 
261 static StringRef parseSegmentOrSectionName(const char *P) {
262   if (P[15] == 0)
263     // Null terminated.
264     return P;
265   // Not null terminated, so this is a 16 char string.
266   return StringRef(P, 16);
267 }
268 
269 // Helper to advance a section or symbol iterator multiple increments at a time.
270 template<class T>
271 static error_code advance(T &it, size_t Val) {
272   error_code ec;
273   while (Val--) {
274     it.increment(ec);
275   }
276   return ec;
277 }
278 
279 template<class T>
280 static void advanceTo(T &it, size_t Val) {
281   if (error_code ec = advance(it, Val))
282     report_fatal_error(ec.message());
283 }
284 
285 static unsigned getCPUType(const MachOObjectFile *O) {
286   return O->getHeader().CPUType;
287 }
288 
289 static void printRelocationTargetName(const MachOObjectFile *O,
290                                       const macho::RelocationEntry &RE,
291                                       raw_string_ostream &fmt) {
292   bool IsScattered = O->isRelocationScattered(RE);
293 
294   // Target of a scattered relocation is an address.  In the interest of
295   // generating pretty output, scan through the symbol table looking for a
296   // symbol that aligns with that address.  If we find one, print it.
297   // Otherwise, we just print the hex address of the target.
298   if (IsScattered) {
299     uint32_t Val = O->getPlainRelocationSymbolNum(RE);
300 
301     error_code ec;
302     for (symbol_iterator SI = O->begin_symbols(), SE = O->end_symbols();
303          SI != SE; SI.increment(ec)) {
304       if (ec) report_fatal_error(ec.message());
305 
306       uint64_t Addr;
307       StringRef Name;
308 
309       if ((ec = SI->getAddress(Addr)))
310         report_fatal_error(ec.message());
311       if (Addr != Val) continue;
312       if ((ec = SI->getName(Name)))
313         report_fatal_error(ec.message());
314       fmt << Name;
315       return;
316     }
317 
318     // If we couldn't find a symbol that this relocation refers to, try
319     // to find a section beginning instead.
320     for (section_iterator SI = O->begin_sections(), SE = O->end_sections();
321          SI != SE; SI.increment(ec)) {
322       if (ec) report_fatal_error(ec.message());
323 
324       uint64_t Addr;
325       StringRef Name;
326 
327       if ((ec = SI->getAddress(Addr)))
328         report_fatal_error(ec.message());
329       if (Addr != Val) continue;
330       if ((ec = SI->getName(Name)))
331         report_fatal_error(ec.message());
332       fmt << Name;
333       return;
334     }
335 
336     fmt << format("0x%x", Val);
337     return;
338   }
339 
340   StringRef S;
341   bool isExtern = O->getPlainRelocationExternal(RE);
342   uint64_t Val = O->getAnyRelocationAddress(RE);
343 
344   if (isExtern) {
345     symbol_iterator SI = O->begin_symbols();
346     advanceTo(SI, Val);
347     SI->getName(S);
348   } else {
349     section_iterator SI = O->begin_sections();
350     advanceTo(SI, Val);
351     SI->getName(S);
352   }
353 
354   fmt << S;
355 }
356 
357 static uint32_t getPlainRelocationAddress(const macho::RelocationEntry &RE) {
358   return RE.Word0;
359 }
360 
361 static unsigned
362 getScatteredRelocationAddress(const macho::RelocationEntry &RE) {
363   return RE.Word0 & 0xffffff;
364 }
365 
366 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
367                                     const macho::RelocationEntry &RE) {
368   if (O->isLittleEndian())
369     return (RE.Word1 >> 24) & 1;
370   return (RE.Word1 >> 7) & 1;
371 }
372 
373 static bool
374 getScatteredRelocationPCRel(const MachOObjectFile *O,
375                             const macho::RelocationEntry &RE) {
376   return (RE.Word0 >> 30) & 1;
377 }
378 
379 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
380                                          const macho::RelocationEntry &RE) {
381   if (O->isLittleEndian())
382     return (RE.Word1 >> 25) & 3;
383   return (RE.Word1 >> 5) & 3;
384 }
385 
386 static unsigned
387 getScatteredRelocationLength(const macho::RelocationEntry &RE) {
388   return (RE.Word0 >> 28) & 3;
389 }
390 
391 static unsigned getPlainRelocationType(const MachOObjectFile *O,
392                                        const macho::RelocationEntry &RE) {
393   if (O->isLittleEndian())
394     return RE.Word1 >> 28;
395   return RE.Word1 & 0xf;
396 }
397 
398 static unsigned getScatteredRelocationType(const macho::RelocationEntry &RE) {
399   return (RE.Word0 >> 24) & 0xf;
400 }
401 
402 static uint32_t getSectionFlags(const MachOObjectFile *O,
403                                 DataRefImpl Sec) {
404   if (O->is64Bit()) {
405     macho::Section64 Sect = O->getSection64(Sec);
406     return Sect.Flags;
407   }
408   macho::Section Sect = O->getSection(Sec);
409   return Sect.Flags;
410 }
411 
412 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
413                                  bool IsLittleEndian, bool Is64bits,
414                                  error_code &ec)
415     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
416       SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL) {
417   uint32_t LoadCommandCount = this->getHeader().NumLoadCommands;
418   macho::LoadCommandType SegmentLoadType = is64Bit() ?
419     macho::LCT_Segment64 : macho::LCT_Segment;
420 
421   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
422   for (unsigned I = 0; ; ++I) {
423     if (Load.C.Type == macho::LCT_Symtab) {
424       assert(!SymtabLoadCmd && "Multiple symbol tables");
425       SymtabLoadCmd = Load.Ptr;
426     } else if (Load.C.Type == macho::LCT_Dysymtab) {
427       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
428       DysymtabLoadCmd = Load.Ptr;
429     } else if (Load.C.Type == SegmentLoadType) {
430       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
431       for (unsigned J = 0; J < NumSections; ++J) {
432         const char *Sec = getSectionPtr(this, Load, J);
433         Sections.push_back(Sec);
434       }
435     }
436 
437     if (I == LoadCommandCount - 1)
438       break;
439     else
440       Load = getNextLoadCommandInfo(Load);
441   }
442 }
443 
444 error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
445                                           SymbolRef &Res) const {
446   unsigned SymbolTableEntrySize = is64Bit() ?
447     sizeof(macho::Symbol64TableEntry) :
448     sizeof(macho::SymbolTableEntry);
449   Symb.p += SymbolTableEntrySize;
450   Res = SymbolRef(Symb, this);
451   return object_error::success;
452 }
453 
454 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
455                                           StringRef &Res) const {
456   StringRef StringTable = getStringTableData();
457   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
458   const char *Start = &StringTable.data()[Entry.StringIndex];
459   Res = StringRef(Start);
460   return object_error::success;
461 }
462 
463 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
464                                              uint64_t &Res) const {
465   if (is64Bit()) {
466     macho::Symbol64TableEntry Entry = getSymbol64TableEntry(Symb);
467     Res = Entry.Value;
468   } else {
469     macho::SymbolTableEntry Entry = getSymbolTableEntry(Symb);
470     Res = Entry.Value;
471   }
472   return object_error::success;
473 }
474 
475 error_code
476 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
477                                      uint64_t &Res) const {
478   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
479   getSymbolAddress(Symb, Res);
480   if (Entry.SectionIndex) {
481     uint64_t Delta;
482     DataRefImpl SecRel;
483     SecRel.d.a = Entry.SectionIndex-1;
484     if (is64Bit()) {
485       macho::Section64 Sec = getSection64(SecRel);
486       Delta = Sec.Offset - Sec.Address;
487     } else {
488       macho::Section Sec = getSection(SecRel);
489       Delta = Sec.Offset - Sec.Address;
490     }
491 
492     Res += Delta;
493   }
494 
495   return object_error::success;
496 }
497 
498 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
499                                           uint64_t &Result) const {
500   uint64_t BeginOffset;
501   uint64_t EndOffset = 0;
502   uint8_t SectionIndex;
503 
504   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
505   uint64_t Value;
506   getSymbolAddress(DRI, Value);
507 
508   BeginOffset = Value;
509 
510   SectionIndex = Entry.SectionIndex;
511   if (!SectionIndex) {
512     uint32_t flags = SymbolRef::SF_None;
513     this->getSymbolFlags(DRI, flags);
514     if (flags & SymbolRef::SF_Common)
515       Result = Value;
516     else
517       Result = UnknownAddressOrSize;
518     return object_error::success;
519   }
520   // Unfortunately symbols are unsorted so we need to touch all
521   // symbols from load command
522   error_code ec;
523   for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E;
524        I.increment(ec)) {
525     DataRefImpl DRI = I->getRawDataRefImpl();
526     Entry = getSymbolTableEntryBase(this, DRI);
527     getSymbolAddress(DRI, Value);
528     if (Entry.SectionIndex == SectionIndex && Value > BeginOffset)
529       if (!EndOffset || Value < EndOffset)
530         EndOffset = Value;
531   }
532   if (!EndOffset) {
533     uint64_t Size;
534     DataRefImpl Sec;
535     Sec.d.a = SectionIndex-1;
536     getSectionSize(Sec, Size);
537     getSectionAddress(Sec, EndOffset);
538     EndOffset += Size;
539   }
540   Result = EndOffset - BeginOffset;
541   return object_error::success;
542 }
543 
544 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
545                                           SymbolRef::Type &Res) const {
546   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
547   uint8_t n_type = Entry.Type;
548 
549   Res = SymbolRef::ST_Other;
550 
551   // If this is a STAB debugging symbol, we can do nothing more.
552   if (n_type & MachO::NlistMaskStab) {
553     Res = SymbolRef::ST_Debug;
554     return object_error::success;
555   }
556 
557   switch (n_type & MachO::NlistMaskType) {
558     case MachO::NListTypeUndefined :
559       Res = SymbolRef::ST_Unknown;
560       break;
561     case MachO::NListTypeSection :
562       Res = SymbolRef::ST_Function;
563       break;
564   }
565   return object_error::success;
566 }
567 
568 error_code MachOObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
569                                                 char &Res) const {
570   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
571   uint8_t Type = Entry.Type;
572   uint16_t Flags = Entry.Flags;
573 
574   char Char;
575   switch (Type & macho::STF_TypeMask) {
576     case macho::STT_Undefined:
577       Char = 'u';
578       break;
579     case macho::STT_Absolute:
580     case macho::STT_Section:
581       Char = 's';
582       break;
583     default:
584       Char = '?';
585       break;
586   }
587 
588   if (Flags & (macho::STF_External | macho::STF_PrivateExtern))
589     Char = toupper(static_cast<unsigned char>(Char));
590   Res = Char;
591   return object_error::success;
592 }
593 
594 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
595                                            uint32_t &Result) const {
596   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, DRI);
597 
598   uint8_t MachOType = Entry.Type;
599   uint16_t MachOFlags = Entry.Flags;
600 
601   // TODO: Correctly set SF_ThreadLocal
602   Result = SymbolRef::SF_None;
603 
604   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
605     Result |= SymbolRef::SF_Undefined;
606 
607   if (MachOFlags & macho::STF_StabsEntryMask)
608     Result |= SymbolRef::SF_FormatSpecific;
609 
610   if (MachOType & MachO::NlistMaskExternal) {
611     Result |= SymbolRef::SF_Global;
612     if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeUndefined)
613       Result |= SymbolRef::SF_Common;
614   }
615 
616   if (MachOFlags & (MachO::NListDescWeakRef | MachO::NListDescWeakDef))
617     Result |= SymbolRef::SF_Weak;
618 
619   if ((MachOType & MachO::NlistMaskType) == MachO::NListTypeAbsolute)
620     Result |= SymbolRef::SF_Absolute;
621 
622   return object_error::success;
623 }
624 
625 error_code
626 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
627                                   section_iterator &Res) const {
628   SymbolTableEntryBase Entry = getSymbolTableEntryBase(this, Symb);
629   uint8_t index = Entry.SectionIndex;
630 
631   if (index == 0) {
632     Res = end_sections();
633   } else {
634     DataRefImpl DRI;
635     DRI.d.a = index - 1;
636     Res = section_iterator(SectionRef(DRI, this));
637   }
638 
639   return object_error::success;
640 }
641 
642 error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
643                                            uint64_t &Val) const {
644   report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
645 }
646 
647 error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
648                                            SectionRef &Res) const {
649   Sec.d.a++;
650   Res = SectionRef(Sec, this);
651   return object_error::success;
652 }
653 
654 error_code
655 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
656   ArrayRef<char> Raw = getSectionRawName(Sec);
657   Result = parseSegmentOrSectionName(Raw.data());
658   return object_error::success;
659 }
660 
661 error_code
662 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
663   if (is64Bit()) {
664     macho::Section64 Sect = getSection64(Sec);
665     Res = Sect.Address;
666   } else {
667     macho::Section Sect = getSection(Sec);
668     Res = Sect.Address;
669   }
670   return object_error::success;
671 }
672 
673 error_code
674 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
675   if (is64Bit()) {
676     macho::Section64 Sect = getSection64(Sec);
677     Res = Sect.Size;
678   } else {
679     macho::Section Sect = getSection(Sec);
680     Res = Sect.Size;
681   }
682 
683   return object_error::success;
684 }
685 
686 error_code
687 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
688   uint32_t Offset;
689   uint64_t Size;
690 
691   if (is64Bit()) {
692     macho::Section64 Sect = getSection64(Sec);
693     Offset = Sect.Offset;
694     Size = Sect.Size;
695   } else {
696     macho::Section Sect =getSection(Sec);
697     Offset = Sect.Offset;
698     Size = Sect.Size;
699   }
700 
701   Res = this->getData().substr(Offset, Size);
702   return object_error::success;
703 }
704 
705 error_code
706 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
707   uint32_t Align;
708   if (is64Bit()) {
709     macho::Section64 Sect = getSection64(Sec);
710     Align = Sect.Align;
711   } else {
712     macho::Section Sect = getSection(Sec);
713     Align = Sect.Align;
714   }
715 
716   Res = uint64_t(1) << Align;
717   return object_error::success;
718 }
719 
720 error_code
721 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
722   uint32_t Flags = getSectionFlags(this, Sec);
723   Res = Flags & macho::SF_PureInstructions;
724   return object_error::success;
725 }
726 
727 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
728   // FIXME: Unimplemented.
729   Result = false;
730   return object_error::success;
731 }
732 
733 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
734   // FIXME: Unimplemented.
735   Result = false;
736   return object_error::success;
737 }
738 
739 error_code
740 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
741                                                bool &Result) const {
742   // FIXME: Unimplemented.
743   Result = true;
744   return object_error::success;
745 }
746 
747 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
748                                              bool &Result) const {
749   // FIXME: Unimplemented.
750   Result = false;
751   return object_error::success;
752 }
753 
754 error_code
755 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
756   uint32_t Flags = getSectionFlags(this, Sec);
757   unsigned SectionType = Flags & MachO::SectionFlagMaskSectionType;
758   Res = SectionType == MachO::SectionTypeZeroFill ||
759     SectionType == MachO::SectionTypeZeroFillLarge;
760   return object_error::success;
761 }
762 
763 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
764                                                   bool &Result) const {
765   // Consider using the code from isSectionText to look for __const sections.
766   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
767   // to use section attributes to distinguish code from data.
768 
769   // FIXME: Unimplemented.
770   Result = false;
771   return object_error::success;
772 }
773 
774 error_code
775 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
776                                        bool &Result) const {
777   SymbolRef::Type ST;
778   this->getSymbolType(Symb, ST);
779   if (ST == SymbolRef::ST_Unknown) {
780     Result = false;
781     return object_error::success;
782   }
783 
784   uint64_t SectBegin, SectEnd;
785   getSectionAddress(Sec, SectBegin);
786   getSectionSize(Sec, SectEnd);
787   SectEnd += SectBegin;
788 
789   uint64_t SymAddr;
790   getSymbolAddress(Symb, SymAddr);
791   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
792 
793   return object_error::success;
794 }
795 
796 relocation_iterator MachOObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
797   uint32_t Offset;
798   if (is64Bit()) {
799     macho::Section64 Sect = getSection64(Sec);
800     Offset = Sect.RelocationTableOffset;
801   } else {
802     macho::Section Sect = getSection(Sec);
803     Offset = Sect.RelocationTableOffset;
804   }
805 
806   DataRefImpl Ret;
807   Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
808   return relocation_iterator(RelocationRef(Ret, this));
809 }
810 
811 relocation_iterator
812 MachOObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
813   uint32_t Offset;
814   uint32_t Num;
815   if (is64Bit()) {
816     macho::Section64 Sect = getSection64(Sec);
817     Offset = Sect.RelocationTableOffset;
818     Num = Sect.NumRelocationTableEntries;
819   } else {
820     macho::Section Sect = getSection(Sec);
821     Offset = Sect.RelocationTableOffset;
822     Num = Sect.NumRelocationTableEntries;
823   }
824 
825   const macho::RelocationEntry *P =
826     reinterpret_cast<const macho::RelocationEntry*>(getPtr(this, Offset));
827 
828   DataRefImpl Ret;
829   Ret.p = reinterpret_cast<uintptr_t>(P + Num);
830   return relocation_iterator(RelocationRef(Ret, this));
831 }
832 
833 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
834                                               RelocationRef &Res) const {
835   const macho::RelocationEntry *P =
836     reinterpret_cast<const macho::RelocationEntry *>(Rel.p);
837   Rel.p = reinterpret_cast<uintptr_t>(P + 1);
838   Res = RelocationRef(Rel, this);
839   return object_error::success;
840 }
841 
842 error_code
843 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
844   report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
845 }
846 
847 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
848                                                 uint64_t &Res) const {
849   macho::RelocationEntry RE = getRelocation(Rel);
850   Res = getAnyRelocationAddress(RE);
851   return object_error::success;
852 }
853 
854 error_code
855 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel, SymbolRef &Res) const {
856   macho::RelocationEntry RE = getRelocation(Rel);
857   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
858   bool isExtern = getPlainRelocationExternal(RE);
859   if (!isExtern) {
860     Res = *end_symbols();
861     return object_error::success;
862   }
863 
864   macho::SymtabLoadCommand S = getSymtabLoadCommand();
865   unsigned SymbolTableEntrySize = is64Bit() ?
866     sizeof(macho::Symbol64TableEntry) :
867     sizeof(macho::SymbolTableEntry);
868   uint64_t Offset = S.SymbolTableOffset + SymbolIdx * SymbolTableEntrySize;
869   DataRefImpl Sym;
870   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
871   Res = SymbolRef(Sym, this);
872   return object_error::success;
873 }
874 
875 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
876                                               uint64_t &Res) const {
877   macho::RelocationEntry RE = getRelocation(Rel);
878   Res = getAnyRelocationType(RE);
879   return object_error::success;
880 }
881 
882 error_code
883 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
884                                        SmallVectorImpl<char> &Result) const {
885   StringRef res;
886   uint64_t RType;
887   getRelocationType(Rel, RType);
888 
889   unsigned Arch = this->getArch();
890 
891   switch (Arch) {
892     case Triple::x86: {
893       static const char *const Table[] =  {
894         "GENERIC_RELOC_VANILLA",
895         "GENERIC_RELOC_PAIR",
896         "GENERIC_RELOC_SECTDIFF",
897         "GENERIC_RELOC_PB_LA_PTR",
898         "GENERIC_RELOC_LOCAL_SECTDIFF",
899         "GENERIC_RELOC_TLV" };
900 
901       if (RType > 6)
902         res = "Unknown";
903       else
904         res = Table[RType];
905       break;
906     }
907     case Triple::x86_64: {
908       static const char *const Table[] =  {
909         "X86_64_RELOC_UNSIGNED",
910         "X86_64_RELOC_SIGNED",
911         "X86_64_RELOC_BRANCH",
912         "X86_64_RELOC_GOT_LOAD",
913         "X86_64_RELOC_GOT",
914         "X86_64_RELOC_SUBTRACTOR",
915         "X86_64_RELOC_SIGNED_1",
916         "X86_64_RELOC_SIGNED_2",
917         "X86_64_RELOC_SIGNED_4",
918         "X86_64_RELOC_TLV" };
919 
920       if (RType > 9)
921         res = "Unknown";
922       else
923         res = Table[RType];
924       break;
925     }
926     case Triple::arm: {
927       static const char *const Table[] =  {
928         "ARM_RELOC_VANILLA",
929         "ARM_RELOC_PAIR",
930         "ARM_RELOC_SECTDIFF",
931         "ARM_RELOC_LOCAL_SECTDIFF",
932         "ARM_RELOC_PB_LA_PTR",
933         "ARM_RELOC_BR24",
934         "ARM_THUMB_RELOC_BR22",
935         "ARM_THUMB_32BIT_BRANCH",
936         "ARM_RELOC_HALF",
937         "ARM_RELOC_HALF_SECTDIFF" };
938 
939       if (RType > 9)
940         res = "Unknown";
941       else
942         res = Table[RType];
943       break;
944     }
945     case Triple::ppc: {
946       static const char *const Table[] =  {
947         "PPC_RELOC_VANILLA",
948         "PPC_RELOC_PAIR",
949         "PPC_RELOC_BR14",
950         "PPC_RELOC_BR24",
951         "PPC_RELOC_HI16",
952         "PPC_RELOC_LO16",
953         "PPC_RELOC_HA16",
954         "PPC_RELOC_LO14",
955         "PPC_RELOC_SECTDIFF",
956         "PPC_RELOC_PB_LA_PTR",
957         "PPC_RELOC_HI16_SECTDIFF",
958         "PPC_RELOC_LO16_SECTDIFF",
959         "PPC_RELOC_HA16_SECTDIFF",
960         "PPC_RELOC_JBSR",
961         "PPC_RELOC_LO14_SECTDIFF",
962         "PPC_RELOC_LOCAL_SECTDIFF" };
963 
964       res = Table[RType];
965       break;
966     }
967     case Triple::UnknownArch:
968       res = "Unknown";
969       break;
970   }
971   Result.append(res.begin(), res.end());
972   return object_error::success;
973 }
974 
975 error_code MachOObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
976                                                         int64_t &Res) const {
977   Res = 0;
978   return object_error::success;
979 }
980 
981 error_code
982 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
983                                           SmallVectorImpl<char> &Result) const {
984   macho::RelocationEntry RE = getRelocation(Rel);
985 
986   unsigned Arch = this->getArch();
987 
988   std::string fmtbuf;
989   raw_string_ostream fmt(fmtbuf);
990   unsigned Type = this->getAnyRelocationType(RE);
991   bool IsPCRel = this->getAnyRelocationPCRel(RE);
992 
993   // Determine any addends that should be displayed with the relocation.
994   // These require decoding the relocation type, which is triple-specific.
995 
996   // X86_64 has entirely custom relocation types.
997   if (Arch == Triple::x86_64) {
998     bool isPCRel = getAnyRelocationPCRel(RE);
999 
1000     switch (Type) {
1001       case macho::RIT_X86_64_GOTLoad:   // X86_64_RELOC_GOT_LOAD
1002       case macho::RIT_X86_64_GOT: {     // X86_64_RELOC_GOT
1003         printRelocationTargetName(this, RE, fmt);
1004         fmt << "@GOT";
1005         if (isPCRel) fmt << "PCREL";
1006         break;
1007       }
1008       case macho::RIT_X86_64_Subtractor: { // X86_64_RELOC_SUBTRACTOR
1009         DataRefImpl RelNext = Rel;
1010         RelNext.d.a++;
1011         macho::RelocationEntry RENext = getRelocation(RelNext);
1012 
1013         // X86_64_SUBTRACTOR must be followed by a relocation of type
1014         // X86_64_RELOC_UNSIGNED.
1015         // NOTE: Scattered relocations don't exist on x86_64.
1016         unsigned RType = getAnyRelocationType(RENext);
1017         if (RType != 0)
1018           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1019                              "X86_64_RELOC_SUBTRACTOR.");
1020 
1021         // The X86_64_RELOC_UNSIGNED contains the minuend symbol,
1022         // X86_64_SUBTRACTOR contains to the subtrahend.
1023         printRelocationTargetName(this, RENext, fmt);
1024         fmt << "-";
1025         printRelocationTargetName(this, RE, fmt);
1026         break;
1027       }
1028       case macho::RIT_X86_64_TLV:
1029         printRelocationTargetName(this, RE, fmt);
1030         fmt << "@TLV";
1031         if (isPCRel) fmt << "P";
1032         break;
1033       case macho::RIT_X86_64_Signed1: // X86_64_RELOC_SIGNED1
1034         printRelocationTargetName(this, RE, fmt);
1035         fmt << "-1";
1036         break;
1037       case macho::RIT_X86_64_Signed2: // X86_64_RELOC_SIGNED2
1038         printRelocationTargetName(this, RE, fmt);
1039         fmt << "-2";
1040         break;
1041       case macho::RIT_X86_64_Signed4: // X86_64_RELOC_SIGNED4
1042         printRelocationTargetName(this, RE, fmt);
1043         fmt << "-4";
1044         break;
1045       default:
1046         printRelocationTargetName(this, RE, fmt);
1047         break;
1048     }
1049   // X86 and ARM share some relocation types in common.
1050   } else if (Arch == Triple::x86 || Arch == Triple::arm) {
1051     // Generic relocation types...
1052     switch (Type) {
1053       case macho::RIT_Pair: // GENERIC_RELOC_PAIR - prints no info
1054         return object_error::success;
1055       case macho::RIT_Difference: { // GENERIC_RELOC_SECTDIFF
1056         DataRefImpl RelNext = Rel;
1057         RelNext.d.a++;
1058         macho::RelocationEntry RENext = getRelocation(RelNext);
1059 
1060         // X86 sect diff's must be followed by a relocation of type
1061         // GENERIC_RELOC_PAIR.
1062         unsigned RType = getAnyRelocationType(RENext);
1063 
1064         if (RType != 1)
1065           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1066                              "GENERIC_RELOC_SECTDIFF.");
1067 
1068         printRelocationTargetName(this, RE, fmt);
1069         fmt << "-";
1070         printRelocationTargetName(this, RENext, fmt);
1071         break;
1072       }
1073     }
1074 
1075     if (Arch == Triple::x86) {
1076       // All X86 relocations that need special printing were already
1077       // handled in the generic code.
1078       switch (Type) {
1079         case macho::RIT_Generic_LocalDifference:{// GENERIC_RELOC_LOCAL_SECTDIFF
1080           DataRefImpl RelNext = Rel;
1081           RelNext.d.a++;
1082           macho::RelocationEntry RENext = getRelocation(RelNext);
1083 
1084           // X86 sect diff's must be followed by a relocation of type
1085           // GENERIC_RELOC_PAIR.
1086           unsigned RType = getAnyRelocationType(RENext);
1087           if (RType != 1)
1088             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1089                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1090 
1091           printRelocationTargetName(this, RE, fmt);
1092           fmt << "-";
1093           printRelocationTargetName(this, RENext, fmt);
1094           break;
1095         }
1096         case macho::RIT_Generic_TLV: {
1097           printRelocationTargetName(this, RE, fmt);
1098           fmt << "@TLV";
1099           if (IsPCRel) fmt << "P";
1100           break;
1101         }
1102         default:
1103           printRelocationTargetName(this, RE, fmt);
1104       }
1105     } else { // ARM-specific relocations
1106       switch (Type) {
1107         case macho::RIT_ARM_Half:             // ARM_RELOC_HALF
1108         case macho::RIT_ARM_HalfDifference: { // ARM_RELOC_HALF_SECTDIFF
1109           // Half relocations steal a bit from the length field to encode
1110           // whether this is an upper16 or a lower16 relocation.
1111           bool isUpper = getAnyRelocationLength(RE) >> 1;
1112 
1113           if (isUpper)
1114             fmt << ":upper16:(";
1115           else
1116             fmt << ":lower16:(";
1117           printRelocationTargetName(this, RE, fmt);
1118 
1119           DataRefImpl RelNext = Rel;
1120           RelNext.d.a++;
1121           macho::RelocationEntry RENext = getRelocation(RelNext);
1122 
1123           // ARM half relocs must be followed by a relocation of type
1124           // ARM_RELOC_PAIR.
1125           unsigned RType = getAnyRelocationType(RENext);
1126           if (RType != 1)
1127             report_fatal_error("Expected ARM_RELOC_PAIR after "
1128                                "GENERIC_RELOC_HALF");
1129 
1130           // NOTE: The half of the target virtual address is stashed in the
1131           // address field of the secondary relocation, but we can't reverse
1132           // engineer the constant offset from it without decoding the movw/movt
1133           // instruction to find the other half in its immediate field.
1134 
1135           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1136           // symbol/section pointer of the follow-on relocation.
1137           if (Type == macho::RIT_ARM_HalfDifference) {
1138             fmt << "-";
1139             printRelocationTargetName(this, RENext, fmt);
1140           }
1141 
1142           fmt << ")";
1143           break;
1144         }
1145         default: {
1146           printRelocationTargetName(this, RE, fmt);
1147         }
1148       }
1149     }
1150   } else
1151     printRelocationTargetName(this, RE, fmt);
1152 
1153   fmt.flush();
1154   Result.append(fmtbuf.begin(), fmtbuf.end());
1155   return object_error::success;
1156 }
1157 
1158 error_code
1159 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1160   unsigned Arch = getArch();
1161   uint64_t Type;
1162   getRelocationType(Rel, Type);
1163 
1164   Result = false;
1165 
1166   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1167   // is always hidden.
1168   if (Arch == Triple::x86 || Arch == Triple::arm) {
1169     if (Type == macho::RIT_Pair) Result = true;
1170   } else if (Arch == Triple::x86_64) {
1171     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1172     // an X864_64_RELOC_SUBTRACTOR.
1173     if (Type == macho::RIT_X86_64_Unsigned && Rel.d.a > 0) {
1174       DataRefImpl RelPrev = Rel;
1175       RelPrev.d.a--;
1176       uint64_t PrevType;
1177       getRelocationType(RelPrev, PrevType);
1178       if (PrevType == macho::RIT_X86_64_Subtractor)
1179         Result = true;
1180     }
1181   }
1182 
1183   return object_error::success;
1184 }
1185 
1186 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1187                                            LibraryRef &Res) const {
1188   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1189 }
1190 
1191 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1192                                            StringRef &Res) const {
1193   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1194 }
1195 
1196 symbol_iterator MachOObjectFile::begin_symbols() const {
1197   DataRefImpl DRI;
1198   if (!SymtabLoadCmd)
1199     return symbol_iterator(SymbolRef(DRI, this));
1200 
1201   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1202   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.SymbolTableOffset));
1203   return symbol_iterator(SymbolRef(DRI, this));
1204 }
1205 
1206 symbol_iterator MachOObjectFile::end_symbols() const {
1207   DataRefImpl DRI;
1208   if (!SymtabLoadCmd)
1209     return symbol_iterator(SymbolRef(DRI, this));
1210 
1211   macho::SymtabLoadCommand Symtab = getSymtabLoadCommand();
1212   unsigned SymbolTableEntrySize = is64Bit() ?
1213     sizeof(macho::Symbol64TableEntry) :
1214     sizeof(macho::SymbolTableEntry);
1215   unsigned Offset = Symtab.SymbolTableOffset +
1216     Symtab.NumSymbolTableEntries * SymbolTableEntrySize;
1217   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1218   return symbol_iterator(SymbolRef(DRI, this));
1219 }
1220 
1221 symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
1222   // TODO: implement
1223   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1224 }
1225 
1226 symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
1227   // TODO: implement
1228   report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1229 }
1230 
1231 section_iterator MachOObjectFile::begin_sections() const {
1232   DataRefImpl DRI;
1233   return section_iterator(SectionRef(DRI, this));
1234 }
1235 
1236 section_iterator MachOObjectFile::end_sections() const {
1237   DataRefImpl DRI;
1238   DRI.d.a = Sections.size();
1239   return section_iterator(SectionRef(DRI, this));
1240 }
1241 
1242 library_iterator MachOObjectFile::begin_libraries_needed() const {
1243   // TODO: implement
1244   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1245 }
1246 
1247 library_iterator MachOObjectFile::end_libraries_needed() const {
1248   // TODO: implement
1249   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1250 }
1251 
1252 uint8_t MachOObjectFile::getBytesInAddress() const {
1253   return is64Bit() ? 8 : 4;
1254 }
1255 
1256 StringRef MachOObjectFile::getFileFormatName() const {
1257   unsigned CPUType = getCPUType(this);
1258   if (!is64Bit()) {
1259     switch (CPUType) {
1260     case llvm::MachO::CPUTypeI386:
1261       return "Mach-O 32-bit i386";
1262     case llvm::MachO::CPUTypeARM:
1263       return "Mach-O arm";
1264     case llvm::MachO::CPUTypePowerPC:
1265       return "Mach-O 32-bit ppc";
1266     default:
1267       assert((CPUType & llvm::MachO::CPUArchABI64) == 0 &&
1268              "64-bit object file when we're not 64-bit?");
1269       return "Mach-O 32-bit unknown";
1270     }
1271   }
1272 
1273   // Make sure the cpu type has the correct mask.
1274   assert((CPUType & llvm::MachO::CPUArchABI64)
1275 	 == llvm::MachO::CPUArchABI64 &&
1276 	 "32-bit object file when we're 64-bit?");
1277 
1278   switch (CPUType) {
1279   case llvm::MachO::CPUTypeX86_64:
1280     return "Mach-O 64-bit x86-64";
1281   case llvm::MachO::CPUTypePowerPC64:
1282     return "Mach-O 64-bit ppc64";
1283   default:
1284     return "Mach-O 64-bit unknown";
1285   }
1286 }
1287 
1288 unsigned MachOObjectFile::getArch() const {
1289   switch (getCPUType(this)) {
1290   case llvm::MachO::CPUTypeI386:
1291     return Triple::x86;
1292   case llvm::MachO::CPUTypeX86_64:
1293     return Triple::x86_64;
1294   case llvm::MachO::CPUTypeARM:
1295     return Triple::arm;
1296   case llvm::MachO::CPUTypePowerPC:
1297     return Triple::ppc;
1298   case llvm::MachO::CPUTypePowerPC64:
1299     return Triple::ppc64;
1300   default:
1301     return Triple::UnknownArch;
1302   }
1303 }
1304 
1305 StringRef MachOObjectFile::getLoadName() const {
1306   // TODO: Implement
1307   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1308 }
1309 
1310 relocation_iterator MachOObjectFile::getSectionRelBegin(unsigned Index) const {
1311   DataRefImpl DRI;
1312   DRI.d.a = Index;
1313   return getSectionRelBegin(DRI);
1314 }
1315 
1316 relocation_iterator MachOObjectFile::getSectionRelEnd(unsigned Index) const {
1317   DataRefImpl DRI;
1318   DRI.d.a = Index;
1319   return getSectionRelEnd(DRI);
1320 }
1321 
1322 StringRef
1323 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1324   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1325   return parseSegmentOrSectionName(Raw.data());
1326 }
1327 
1328 ArrayRef<char>
1329 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1330   const SectionBase *Base =
1331     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1332   return ArrayRef<char>(Base->Name);
1333 }
1334 
1335 ArrayRef<char>
1336 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1337   const SectionBase *Base =
1338     reinterpret_cast<const SectionBase*>(Sections[Sec.d.a]);
1339   return ArrayRef<char>(Base->SegmentName);
1340 }
1341 
1342 bool
1343 MachOObjectFile::isRelocationScattered(const macho::RelocationEntry &RE)
1344   const {
1345   if (getCPUType(this) == llvm::MachO::CPUTypeX86_64)
1346     return false;
1347   return getPlainRelocationAddress(RE) & macho::RF_Scattered;
1348 }
1349 
1350 unsigned MachOObjectFile::getPlainRelocationSymbolNum(const macho::RelocationEntry &RE) const {
1351   if (isLittleEndian())
1352     return RE.Word1 & 0xffffff;
1353   return RE.Word1 >> 8;
1354 }
1355 
1356 bool MachOObjectFile::getPlainRelocationExternal(const macho::RelocationEntry &RE) const {
1357   if (isLittleEndian())
1358     return (RE.Word1 >> 27) & 1;
1359   return (RE.Word1 >> 4) & 1;
1360 }
1361 
1362 bool
1363 MachOObjectFile::getScatteredRelocationScattered(const macho::RelocationEntry &RE) const {
1364   return RE.Word0 >> 31;
1365 }
1366 
1367 uint32_t
1368 MachOObjectFile::getScatteredRelocationValue(const macho::RelocationEntry &RE) const {
1369   return RE.Word1;
1370 }
1371 
1372 unsigned
1373 MachOObjectFile::getAnyRelocationAddress(const macho::RelocationEntry &RE) const {
1374   if (isRelocationScattered(RE))
1375     return getScatteredRelocationAddress(RE);
1376   return getPlainRelocationAddress(RE);
1377 }
1378 
1379 unsigned
1380 MachOObjectFile::getAnyRelocationPCRel(const macho::RelocationEntry &RE) const {
1381   if (isRelocationScattered(RE))
1382     return getScatteredRelocationPCRel(this, RE);
1383   return getPlainRelocationPCRel(this, RE);
1384 }
1385 
1386 unsigned
1387 MachOObjectFile::getAnyRelocationLength(const macho::RelocationEntry &RE) const {
1388   if (isRelocationScattered(RE))
1389     return getScatteredRelocationLength(RE);
1390   return getPlainRelocationLength(this, RE);
1391 }
1392 
1393 unsigned
1394 MachOObjectFile::getAnyRelocationType(const macho::RelocationEntry &RE) const {
1395   if (isRelocationScattered(RE))
1396     return getScatteredRelocationType(RE);
1397   return getPlainRelocationType(this, RE);
1398 }
1399 
1400 MachOObjectFile::LoadCommandInfo
1401 MachOObjectFile::getFirstLoadCommandInfo() const {
1402   MachOObjectFile::LoadCommandInfo Load;
1403 
1404   unsigned HeaderSize = is64Bit() ? macho::Header64Size : macho::Header32Size;
1405   Load.Ptr = getPtr(this, HeaderSize);
1406   Load.C = getStruct<macho::LoadCommand>(this, Load.Ptr);
1407   return Load;
1408 }
1409 
1410 MachOObjectFile::LoadCommandInfo
1411 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1412   MachOObjectFile::LoadCommandInfo Next;
1413   Next.Ptr = L.Ptr + L.C.Size;
1414   Next.C = getStruct<macho::LoadCommand>(this, Next.Ptr);
1415   return Next;
1416 }
1417 
1418 macho::Section MachOObjectFile::getSection(DataRefImpl DRI) const {
1419   return getStruct<macho::Section>(this, Sections[DRI.d.a]);
1420 }
1421 
1422 macho::Section64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1423   return getStruct<macho::Section64>(this, Sections[DRI.d.a]);
1424 }
1425 
1426 macho::Section MachOObjectFile::getSection(const LoadCommandInfo &L,
1427                                            unsigned Index) const {
1428   const char *Sec = getSectionPtr(this, L, Index);
1429   return getStruct<macho::Section>(this, Sec);
1430 }
1431 
1432 macho::Section64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1433                                                unsigned Index) const {
1434   const char *Sec = getSectionPtr(this, L, Index);
1435   return getStruct<macho::Section64>(this, Sec);
1436 }
1437 
1438 macho::SymbolTableEntry
1439 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1440   const char *P = reinterpret_cast<const char *>(DRI.p);
1441   return getStruct<macho::SymbolTableEntry>(this, P);
1442 }
1443 
1444 macho::Symbol64TableEntry
1445 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1446   const char *P = reinterpret_cast<const char *>(DRI.p);
1447   return getStruct<macho::Symbol64TableEntry>(this, P);
1448 }
1449 
1450 macho::LinkeditDataLoadCommand
1451 MachOObjectFile::getLinkeditDataLoadCommand(const MachOObjectFile::LoadCommandInfo &L) const {
1452   return getStruct<macho::LinkeditDataLoadCommand>(this, L.Ptr);
1453 }
1454 
1455 macho::SegmentLoadCommand
1456 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1457   return getStruct<macho::SegmentLoadCommand>(this, L.Ptr);
1458 }
1459 
1460 macho::Segment64LoadCommand
1461 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1462   return getStruct<macho::Segment64LoadCommand>(this, L.Ptr);
1463 }
1464 
1465 macho::LinkerOptionsLoadCommand
1466 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1467   return getStruct<macho::LinkerOptionsLoadCommand>(this, L.Ptr);
1468 }
1469 
1470 macho::RelocationEntry
1471 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1472   const char *P = reinterpret_cast<const char *>(Rel.p);
1473   return getStruct<macho::RelocationEntry>(this, P);
1474 }
1475 
1476 macho::Header MachOObjectFile::getHeader() const {
1477   return getStruct<macho::Header>(this, getPtr(this, 0));
1478 }
1479 
1480 macho::Header64Ext MachOObjectFile::getHeader64Ext() const {
1481   return
1482     getStruct<macho::Header64Ext>(this, getPtr(this, sizeof(macho::Header)));
1483 }
1484 
1485 macho::IndirectSymbolTableEntry MachOObjectFile::getIndirectSymbolTableEntry(
1486                                           const macho::DysymtabLoadCommand &DLC,
1487                                           unsigned Index) const {
1488   uint64_t Offset = DLC.IndirectSymbolTableOffset +
1489     Index * sizeof(macho::IndirectSymbolTableEntry);
1490   return getStruct<macho::IndirectSymbolTableEntry>(this, getPtr(this, Offset));
1491 }
1492 
1493 macho::DataInCodeTableEntry
1494 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1495                                          unsigned Index) const {
1496   uint64_t Offset = DataOffset + Index * sizeof(macho::DataInCodeTableEntry);
1497   return getStruct<macho::DataInCodeTableEntry>(this, getPtr(this, Offset));
1498 }
1499 
1500 macho::SymtabLoadCommand MachOObjectFile::getSymtabLoadCommand() const {
1501   return getStruct<macho::SymtabLoadCommand>(this, SymtabLoadCmd);
1502 }
1503 
1504 macho::DysymtabLoadCommand MachOObjectFile::getDysymtabLoadCommand() const {
1505   return getStruct<macho::DysymtabLoadCommand>(this, DysymtabLoadCmd);
1506 }
1507 
1508 StringRef MachOObjectFile::getStringTableData() const {
1509   macho::SymtabLoadCommand S = getSymtabLoadCommand();
1510   return getData().substr(S.StringTableOffset, S.StringTableSize);
1511 }
1512 
1513 bool MachOObjectFile::is64Bit() const {
1514   return getType() == getMachOType(false, true) ||
1515     getType() == getMachOType(true, true);
1516 }
1517 
1518 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1519                                    SmallVectorImpl<uint64_t> &Out) const {
1520   DataExtractor extractor(ObjectFile::getData(), true, 0);
1521 
1522   uint32_t offset = Index;
1523   uint64_t data = 0;
1524   while (uint64_t delta = extractor.getULEB128(&offset)) {
1525     data += delta;
1526     Out.push_back(data);
1527   }
1528 }
1529 
1530 ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
1531   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1532   error_code ec;
1533   ObjectFile *Ret;
1534   if (Magic == "\xFE\xED\xFA\xCE")
1535     Ret = new MachOObjectFile(Buffer, false, false, ec);
1536   else if (Magic == "\xCE\xFA\xED\xFE")
1537     Ret = new MachOObjectFile(Buffer, true, false, ec);
1538   else if (Magic == "\xFE\xED\xFA\xCF")
1539     Ret = new MachOObjectFile(Buffer, false, true, ec);
1540   else if (Magic == "\xCF\xFA\xED\xFE")
1541     Ret = new MachOObjectFile(Buffer, true, true, ec);
1542   else
1543     return NULL;
1544 
1545   if (ec)
1546     return NULL;
1547   return Ret;
1548 }
1549 
1550 } // end namespace object
1551 } // end namespace llvm
1552