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1 //===- MachOObjectFile.cpp - Mach-O object file binding ---------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the MachOObjectFile class, which binds the MachOObject
11 // class to the generic ObjectFile wrapper.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "llvm/Object/MachO.h"
16 #include "llvm/ADT/STLExtras.h"
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Support/DataExtractor.h"
19 #include "llvm/Support/Format.h"
20 #include "llvm/Support/Host.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include <cctype>
24 #include <cstring>
25 #include <limits>
26 
27 using namespace llvm;
28 using namespace object;
29 
30 namespace llvm {
31 
32 namespace object {
33 
34 struct nlist_base {
35   uint32_t n_strx;
36   uint8_t n_type;
37   uint8_t n_sect;
38   uint16_t n_desc;
39 };
40 
41 struct section_base {
42   char sectname[16];
43   char segname[16];
44 };
45 
46 template<typename T>
47 static void SwapStruct(T &Value);
48 
49 template<>
SwapStruct(MachO::any_relocation_info & H)50 void SwapStruct(MachO::any_relocation_info &H) {
51   sys::swapByteOrder(H.r_word0);
52   sys::swapByteOrder(H.r_word1);
53 }
54 
55 template<>
SwapStruct(MachO::load_command & L)56 void SwapStruct(MachO::load_command &L) {
57   sys::swapByteOrder(L.cmd);
58   sys::swapByteOrder(L.cmdsize);
59 }
60 
61 template<>
SwapStruct(nlist_base & S)62 void SwapStruct(nlist_base &S) {
63   sys::swapByteOrder(S.n_strx);
64   sys::swapByteOrder(S.n_desc);
65 }
66 
67 template<>
SwapStruct(MachO::section & S)68 void SwapStruct(MachO::section &S) {
69   sys::swapByteOrder(S.addr);
70   sys::swapByteOrder(S.size);
71   sys::swapByteOrder(S.offset);
72   sys::swapByteOrder(S.align);
73   sys::swapByteOrder(S.reloff);
74   sys::swapByteOrder(S.nreloc);
75   sys::swapByteOrder(S.flags);
76   sys::swapByteOrder(S.reserved1);
77   sys::swapByteOrder(S.reserved2);
78 }
79 
80 template<>
SwapStruct(MachO::section_64 & S)81 void SwapStruct(MachO::section_64 &S) {
82   sys::swapByteOrder(S.addr);
83   sys::swapByteOrder(S.size);
84   sys::swapByteOrder(S.offset);
85   sys::swapByteOrder(S.align);
86   sys::swapByteOrder(S.reloff);
87   sys::swapByteOrder(S.nreloc);
88   sys::swapByteOrder(S.flags);
89   sys::swapByteOrder(S.reserved1);
90   sys::swapByteOrder(S.reserved2);
91   sys::swapByteOrder(S.reserved3);
92 }
93 
94 template<>
SwapStruct(MachO::nlist & S)95 void SwapStruct(MachO::nlist &S) {
96   sys::swapByteOrder(S.n_strx);
97   sys::swapByteOrder(S.n_desc);
98   sys::swapByteOrder(S.n_value);
99 }
100 
101 template<>
SwapStruct(MachO::nlist_64 & S)102 void SwapStruct(MachO::nlist_64 &S) {
103   sys::swapByteOrder(S.n_strx);
104   sys::swapByteOrder(S.n_desc);
105   sys::swapByteOrder(S.n_value);
106 }
107 
108 template<>
SwapStruct(MachO::mach_header & H)109 void SwapStruct(MachO::mach_header &H) {
110   sys::swapByteOrder(H.magic);
111   sys::swapByteOrder(H.cputype);
112   sys::swapByteOrder(H.cpusubtype);
113   sys::swapByteOrder(H.filetype);
114   sys::swapByteOrder(H.ncmds);
115   sys::swapByteOrder(H.sizeofcmds);
116   sys::swapByteOrder(H.flags);
117 }
118 
119 template<>
SwapStruct(MachO::mach_header_64 & H)120 void SwapStruct(MachO::mach_header_64 &H) {
121   sys::swapByteOrder(H.magic);
122   sys::swapByteOrder(H.cputype);
123   sys::swapByteOrder(H.cpusubtype);
124   sys::swapByteOrder(H.filetype);
125   sys::swapByteOrder(H.ncmds);
126   sys::swapByteOrder(H.sizeofcmds);
127   sys::swapByteOrder(H.flags);
128   sys::swapByteOrder(H.reserved);
129 }
130 
131 template<>
SwapStruct(MachO::symtab_command & C)132 void SwapStruct(MachO::symtab_command &C) {
133   sys::swapByteOrder(C.cmd);
134   sys::swapByteOrder(C.cmdsize);
135   sys::swapByteOrder(C.symoff);
136   sys::swapByteOrder(C.nsyms);
137   sys::swapByteOrder(C.stroff);
138   sys::swapByteOrder(C.strsize);
139 }
140 
141 template<>
SwapStruct(MachO::dysymtab_command & C)142 void SwapStruct(MachO::dysymtab_command &C) {
143   sys::swapByteOrder(C.cmd);
144   sys::swapByteOrder(C.cmdsize);
145   sys::swapByteOrder(C.ilocalsym);
146   sys::swapByteOrder(C.nlocalsym);
147   sys::swapByteOrder(C.iextdefsym);
148   sys::swapByteOrder(C.nextdefsym);
149   sys::swapByteOrder(C.iundefsym);
150   sys::swapByteOrder(C.nundefsym);
151   sys::swapByteOrder(C.tocoff);
152   sys::swapByteOrder(C.ntoc);
153   sys::swapByteOrder(C.modtaboff);
154   sys::swapByteOrder(C.nmodtab);
155   sys::swapByteOrder(C.extrefsymoff);
156   sys::swapByteOrder(C.nextrefsyms);
157   sys::swapByteOrder(C.indirectsymoff);
158   sys::swapByteOrder(C.nindirectsyms);
159   sys::swapByteOrder(C.extreloff);
160   sys::swapByteOrder(C.nextrel);
161   sys::swapByteOrder(C.locreloff);
162   sys::swapByteOrder(C.nlocrel);
163 }
164 
165 template<>
SwapStruct(MachO::linkedit_data_command & C)166 void SwapStruct(MachO::linkedit_data_command &C) {
167   sys::swapByteOrder(C.cmd);
168   sys::swapByteOrder(C.cmdsize);
169   sys::swapByteOrder(C.dataoff);
170   sys::swapByteOrder(C.datasize);
171 }
172 
173 template<>
SwapStruct(MachO::segment_command & C)174 void SwapStruct(MachO::segment_command &C) {
175   sys::swapByteOrder(C.cmd);
176   sys::swapByteOrder(C.cmdsize);
177   sys::swapByteOrder(C.vmaddr);
178   sys::swapByteOrder(C.vmsize);
179   sys::swapByteOrder(C.fileoff);
180   sys::swapByteOrder(C.filesize);
181   sys::swapByteOrder(C.maxprot);
182   sys::swapByteOrder(C.initprot);
183   sys::swapByteOrder(C.nsects);
184   sys::swapByteOrder(C.flags);
185 }
186 
187 template<>
SwapStruct(MachO::segment_command_64 & C)188 void SwapStruct(MachO::segment_command_64 &C) {
189   sys::swapByteOrder(C.cmd);
190   sys::swapByteOrder(C.cmdsize);
191   sys::swapByteOrder(C.vmaddr);
192   sys::swapByteOrder(C.vmsize);
193   sys::swapByteOrder(C.fileoff);
194   sys::swapByteOrder(C.filesize);
195   sys::swapByteOrder(C.maxprot);
196   sys::swapByteOrder(C.initprot);
197   sys::swapByteOrder(C.nsects);
198   sys::swapByteOrder(C.flags);
199 }
200 
201 template<>
SwapStruct(uint32_t & C)202 void SwapStruct(uint32_t &C) {
203   sys::swapByteOrder(C);
204 }
205 
206 template<>
SwapStruct(MachO::linker_options_command & C)207 void SwapStruct(MachO::linker_options_command &C) {
208   sys::swapByteOrder(C.cmd);
209   sys::swapByteOrder(C.cmdsize);
210   sys::swapByteOrder(C.count);
211 }
212 
213 template<>
SwapStruct(MachO::version_min_command & C)214 void SwapStruct(MachO::version_min_command&C) {
215   sys::swapByteOrder(C.cmd);
216   sys::swapByteOrder(C.cmdsize);
217   sys::swapByteOrder(C.version);
218   sys::swapByteOrder(C.reserved);
219 }
220 
221 template<>
SwapStruct(MachO::dylib_command & C)222 void SwapStruct(MachO::dylib_command&C) {
223   sys::swapByteOrder(C.cmd);
224   sys::swapByteOrder(C.cmdsize);
225   sys::swapByteOrder(C.dylib.name);
226   sys::swapByteOrder(C.dylib.timestamp);
227   sys::swapByteOrder(C.dylib.current_version);
228   sys::swapByteOrder(C.dylib.compatibility_version);
229 }
230 
231 template<>
SwapStruct(MachO::data_in_code_entry & C)232 void SwapStruct(MachO::data_in_code_entry &C) {
233   sys::swapByteOrder(C.offset);
234   sys::swapByteOrder(C.length);
235   sys::swapByteOrder(C.kind);
236 }
237 
238 template<typename T>
getStruct(const MachOObjectFile * O,const char * P)239 T getStruct(const MachOObjectFile *O, const char *P) {
240   T Cmd;
241   memcpy(&Cmd, P, sizeof(T));
242   if (O->isLittleEndian() != sys::IsLittleEndianHost)
243     SwapStruct(Cmd);
244   return Cmd;
245 }
246 
247 static uint32_t
getSegmentLoadCommandNumSections(const MachOObjectFile * O,const MachOObjectFile::LoadCommandInfo & L)248 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
249                                  const MachOObjectFile::LoadCommandInfo &L) {
250   if (O->is64Bit()) {
251     MachO::segment_command_64 S = O->getSegment64LoadCommand(L);
252     return S.nsects;
253   }
254   MachO::segment_command S = O->getSegmentLoadCommand(L);
255   return S.nsects;
256 }
257 
258 static const char *
getSectionPtr(const MachOObjectFile * O,MachOObjectFile::LoadCommandInfo L,unsigned Sec)259 getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
260               unsigned Sec) {
261   uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
262 
263   bool Is64 = O->is64Bit();
264   unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
265                                     sizeof(MachO::segment_command);
266   unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
267                                 sizeof(MachO::section);
268 
269   uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
270   return reinterpret_cast<const char*>(SectionAddr);
271 }
272 
getPtr(const MachOObjectFile * O,size_t Offset)273 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
274   return O->getData().substr(Offset, 1).data();
275 }
276 
277 static nlist_base
getSymbolTableEntryBase(const MachOObjectFile * O,DataRefImpl DRI)278 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
279   const char *P = reinterpret_cast<const char *>(DRI.p);
280   return getStruct<nlist_base>(O, P);
281 }
282 
parseSegmentOrSectionName(const char * P)283 static StringRef parseSegmentOrSectionName(const char *P) {
284   if (P[15] == 0)
285     // Null terminated.
286     return P;
287   // Not null terminated, so this is a 16 char string.
288   return StringRef(P, 16);
289 }
290 
291 // Helper to advance a section or symbol iterator multiple increments at a time.
292 template<class T>
advance(T & it,size_t Val)293 static void advance(T &it, size_t Val) {
294   while (Val--)
295     ++it;
296 }
297 
getCPUType(const MachOObjectFile * O)298 static unsigned getCPUType(const MachOObjectFile *O) {
299   return O->getHeader().cputype;
300 }
301 
printRelocationTargetName(const MachOObjectFile * O,const MachO::any_relocation_info & RE,raw_string_ostream & fmt)302 static void printRelocationTargetName(const MachOObjectFile *O,
303                                       const MachO::any_relocation_info &RE,
304                                       raw_string_ostream &fmt) {
305   bool IsScattered = O->isRelocationScattered(RE);
306 
307   // Target of a scattered relocation is an address.  In the interest of
308   // generating pretty output, scan through the symbol table looking for a
309   // symbol that aligns with that address.  If we find one, print it.
310   // Otherwise, we just print the hex address of the target.
311   if (IsScattered) {
312     uint32_t Val = O->getPlainRelocationSymbolNum(RE);
313 
314     for (const SymbolRef &Symbol : O->symbols()) {
315       std::error_code ec;
316       uint64_t Addr;
317       StringRef Name;
318 
319       if ((ec = Symbol.getAddress(Addr)))
320         report_fatal_error(ec.message());
321       if (Addr != Val)
322         continue;
323       if ((ec = Symbol.getName(Name)))
324         report_fatal_error(ec.message());
325       fmt << Name;
326       return;
327     }
328 
329     // If we couldn't find a symbol that this relocation refers to, try
330     // to find a section beginning instead.
331     for (const SectionRef &Section : O->sections()) {
332       std::error_code ec;
333       uint64_t Addr;
334       StringRef Name;
335 
336       if ((ec = Section.getAddress(Addr)))
337         report_fatal_error(ec.message());
338       if (Addr != Val)
339         continue;
340       if ((ec = Section.getName(Name)))
341         report_fatal_error(ec.message());
342       fmt << Name;
343       return;
344     }
345 
346     fmt << format("0x%x", Val);
347     return;
348   }
349 
350   StringRef S;
351   bool isExtern = O->getPlainRelocationExternal(RE);
352   uint64_t Val = O->getPlainRelocationSymbolNum(RE);
353 
354   if (isExtern) {
355     symbol_iterator SI = O->symbol_begin();
356     advance(SI, Val);
357     SI->getName(S);
358   } else {
359     section_iterator SI = O->section_begin();
360     // Adjust for the fact that sections are 1-indexed.
361     advance(SI, Val - 1);
362     SI->getName(S);
363   }
364 
365   fmt << S;
366 }
367 
368 static uint32_t
getPlainRelocationAddress(const MachO::any_relocation_info & RE)369 getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
370   return RE.r_word0;
371 }
372 
373 static unsigned
getScatteredRelocationAddress(const MachO::any_relocation_info & RE)374 getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
375   return RE.r_word0 & 0xffffff;
376 }
377 
getPlainRelocationPCRel(const MachOObjectFile * O,const MachO::any_relocation_info & RE)378 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
379                                     const MachO::any_relocation_info &RE) {
380   if (O->isLittleEndian())
381     return (RE.r_word1 >> 24) & 1;
382   return (RE.r_word1 >> 7) & 1;
383 }
384 
385 static bool
getScatteredRelocationPCRel(const MachOObjectFile * O,const MachO::any_relocation_info & RE)386 getScatteredRelocationPCRel(const MachOObjectFile *O,
387                             const MachO::any_relocation_info &RE) {
388   return (RE.r_word0 >> 30) & 1;
389 }
390 
getPlainRelocationLength(const MachOObjectFile * O,const MachO::any_relocation_info & RE)391 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
392                                          const MachO::any_relocation_info &RE) {
393   if (O->isLittleEndian())
394     return (RE.r_word1 >> 25) & 3;
395   return (RE.r_word1 >> 5) & 3;
396 }
397 
398 static unsigned
getScatteredRelocationLength(const MachO::any_relocation_info & RE)399 getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
400   return (RE.r_word0 >> 28) & 3;
401 }
402 
getPlainRelocationType(const MachOObjectFile * O,const MachO::any_relocation_info & RE)403 static unsigned getPlainRelocationType(const MachOObjectFile *O,
404                                        const MachO::any_relocation_info &RE) {
405   if (O->isLittleEndian())
406     return RE.r_word1 >> 28;
407   return RE.r_word1 & 0xf;
408 }
409 
410 static unsigned
getScatteredRelocationType(const MachO::any_relocation_info & RE)411 getScatteredRelocationType(const MachO::any_relocation_info &RE) {
412   return (RE.r_word0 >> 24) & 0xf;
413 }
414 
getSectionFlags(const MachOObjectFile * O,DataRefImpl Sec)415 static uint32_t getSectionFlags(const MachOObjectFile *O,
416                                 DataRefImpl Sec) {
417   if (O->is64Bit()) {
418     MachO::section_64 Sect = O->getSection64(Sec);
419     return Sect.flags;
420   }
421   MachO::section Sect = O->getSection(Sec);
422   return Sect.flags;
423 }
424 
MachOObjectFile(std::unique_ptr<MemoryBuffer> Object,bool IsLittleEndian,bool Is64bits,std::error_code & EC)425 MachOObjectFile::MachOObjectFile(std::unique_ptr<MemoryBuffer> Object,
426                                  bool IsLittleEndian, bool Is64bits,
427                                  std::error_code &EC)
428     : ObjectFile(getMachOType(IsLittleEndian, Is64bits), std::move(Object)),
429       SymtabLoadCmd(nullptr), DysymtabLoadCmd(nullptr),
430       DataInCodeLoadCmd(nullptr) {
431   uint32_t LoadCommandCount = this->getHeader().ncmds;
432   MachO::LoadCommandType SegmentLoadType = is64Bit() ?
433     MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
434 
435   MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
436   for (unsigned I = 0; ; ++I) {
437     if (Load.C.cmd == MachO::LC_SYMTAB) {
438       assert(!SymtabLoadCmd && "Multiple symbol tables");
439       SymtabLoadCmd = Load.Ptr;
440     } else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
441       assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
442       DysymtabLoadCmd = Load.Ptr;
443     } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
444       assert(!DataInCodeLoadCmd && "Multiple data in code tables");
445       DataInCodeLoadCmd = Load.Ptr;
446     } else if (Load.C.cmd == SegmentLoadType) {
447       uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
448       for (unsigned J = 0; J < NumSections; ++J) {
449         const char *Sec = getSectionPtr(this, Load, J);
450         Sections.push_back(Sec);
451       }
452     } else if (Load.C.cmd == MachO::LC_LOAD_DYLIB ||
453                Load.C.cmd == MachO::LC_LOAD_WEAK_DYLIB ||
454                Load.C.cmd == MachO::LC_LAZY_LOAD_DYLIB ||
455                Load.C.cmd == MachO::LC_REEXPORT_DYLIB ||
456                Load.C.cmd == MachO::LC_LOAD_UPWARD_DYLIB) {
457       Libraries.push_back(Load.Ptr);
458     }
459 
460     if (I == LoadCommandCount - 1)
461       break;
462     else
463       Load = getNextLoadCommandInfo(Load);
464   }
465 }
466 
moveSymbolNext(DataRefImpl & Symb) const467 void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
468   unsigned SymbolTableEntrySize = is64Bit() ?
469     sizeof(MachO::nlist_64) :
470     sizeof(MachO::nlist);
471   Symb.p += SymbolTableEntrySize;
472 }
473 
getSymbolName(DataRefImpl Symb,StringRef & Res) const474 std::error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
475                                                StringRef &Res) const {
476   StringRef StringTable = getStringTableData();
477   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
478   const char *Start = &StringTable.data()[Entry.n_strx];
479   Res = StringRef(Start);
480   return object_error::success;
481 }
482 
483 // getIndirectName() returns the name of the alias'ed symbol who's string table
484 // index is in the n_value field.
getIndirectName(DataRefImpl Symb,StringRef & Res) const485 std::error_code MachOObjectFile::getIndirectName(DataRefImpl Symb,
486                                                  StringRef &Res) const {
487   StringRef StringTable = getStringTableData();
488   uint64_t NValue;
489   if (is64Bit()) {
490     MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
491     NValue = Entry.n_value;
492     if ((Entry.n_type & MachO::N_TYPE) != MachO::N_INDR)
493       return object_error::parse_failed;
494   } else {
495     MachO::nlist Entry = getSymbolTableEntry(Symb);
496     NValue = Entry.n_value;
497     if ((Entry.n_type & MachO::N_TYPE) != MachO::N_INDR)
498       return object_error::parse_failed;
499   }
500   if (NValue >= StringTable.size())
501     return object_error::parse_failed;
502   const char *Start = &StringTable.data()[NValue];
503   Res = StringRef(Start);
504   return object_error::success;
505 }
506 
getSymbolAddress(DataRefImpl Symb,uint64_t & Res) const507 std::error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
508                                                   uint64_t &Res) const {
509   if (is64Bit()) {
510     MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
511     if ((Entry.n_type & MachO::N_TYPE) == MachO::N_UNDF &&
512         Entry.n_value == 0)
513       Res = UnknownAddressOrSize;
514     else
515       Res = Entry.n_value;
516   } else {
517     MachO::nlist Entry = getSymbolTableEntry(Symb);
518     if ((Entry.n_type & MachO::N_TYPE) == MachO::N_UNDF &&
519         Entry.n_value == 0)
520       Res = UnknownAddressOrSize;
521     else
522       Res = Entry.n_value;
523   }
524   return object_error::success;
525 }
526 
getSymbolAlignment(DataRefImpl DRI,uint32_t & Result) const527 std::error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
528                                                     uint32_t &Result) const {
529   uint32_t flags = getSymbolFlags(DRI);
530   if (flags & SymbolRef::SF_Common) {
531     nlist_base Entry = getSymbolTableEntryBase(this, DRI);
532     Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
533   } else {
534     Result = 0;
535   }
536   return object_error::success;
537 }
538 
getSymbolSize(DataRefImpl DRI,uint64_t & Result) const539 std::error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
540                                                uint64_t &Result) const {
541   uint64_t BeginOffset;
542   uint64_t EndOffset = 0;
543   uint8_t SectionIndex;
544 
545   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
546   uint64_t Value;
547   getSymbolAddress(DRI, Value);
548   if (Value == UnknownAddressOrSize) {
549     Result = UnknownAddressOrSize;
550     return object_error::success;
551   }
552 
553   BeginOffset = Value;
554 
555   SectionIndex = Entry.n_sect;
556   if (!SectionIndex) {
557     uint32_t flags = getSymbolFlags(DRI);
558     if (flags & SymbolRef::SF_Common)
559       Result = Value;
560     else
561       Result = UnknownAddressOrSize;
562     return object_error::success;
563   }
564   // Unfortunately symbols are unsorted so we need to touch all
565   // symbols from load command
566   for (const SymbolRef &Symbol : symbols()) {
567     DataRefImpl DRI = Symbol.getRawDataRefImpl();
568     Entry = getSymbolTableEntryBase(this, DRI);
569     getSymbolAddress(DRI, Value);
570     if (Value == UnknownAddressOrSize)
571       continue;
572     if (Entry.n_sect == SectionIndex && Value > BeginOffset)
573       if (!EndOffset || Value < EndOffset)
574         EndOffset = Value;
575   }
576   if (!EndOffset) {
577     uint64_t Size;
578     DataRefImpl Sec;
579     Sec.d.a = SectionIndex-1;
580     getSectionSize(Sec, Size);
581     getSectionAddress(Sec, EndOffset);
582     EndOffset += Size;
583   }
584   Result = EndOffset - BeginOffset;
585   return object_error::success;
586 }
587 
getSymbolType(DataRefImpl Symb,SymbolRef::Type & Res) const588 std::error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
589                                                SymbolRef::Type &Res) const {
590   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
591   uint8_t n_type = Entry.n_type;
592 
593   Res = SymbolRef::ST_Other;
594 
595   // If this is a STAB debugging symbol, we can do nothing more.
596   if (n_type & MachO::N_STAB) {
597     Res = SymbolRef::ST_Debug;
598     return object_error::success;
599   }
600 
601   switch (n_type & MachO::N_TYPE) {
602     case MachO::N_UNDF :
603       Res = SymbolRef::ST_Unknown;
604       break;
605     case MachO::N_SECT :
606       Res = SymbolRef::ST_Function;
607       break;
608   }
609   return object_error::success;
610 }
611 
getSymbolFlags(DataRefImpl DRI) const612 uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
613   nlist_base Entry = getSymbolTableEntryBase(this, DRI);
614 
615   uint8_t MachOType = Entry.n_type;
616   uint16_t MachOFlags = Entry.n_desc;
617 
618   uint32_t Result = SymbolRef::SF_None;
619 
620   if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
621     Result |= SymbolRef::SF_Undefined;
622 
623   if ((MachOType & MachO::N_TYPE) == MachO::N_INDR)
624     Result |= SymbolRef::SF_Indirect;
625 
626   if (MachOType & MachO::N_STAB)
627     Result |= SymbolRef::SF_FormatSpecific;
628 
629   if (MachOType & MachO::N_EXT) {
630     Result |= SymbolRef::SF_Global;
631     if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
632       uint64_t Value;
633       getSymbolAddress(DRI, Value);
634       if (Value && Value != UnknownAddressOrSize)
635         Result |= SymbolRef::SF_Common;
636     }
637   }
638 
639   if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
640     Result |= SymbolRef::SF_Weak;
641 
642   if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
643     Result |= SymbolRef::SF_Absolute;
644 
645   return Result;
646 }
647 
getSymbolSection(DataRefImpl Symb,section_iterator & Res) const648 std::error_code MachOObjectFile::getSymbolSection(DataRefImpl Symb,
649                                                   section_iterator &Res) const {
650   nlist_base Entry = getSymbolTableEntryBase(this, Symb);
651   uint8_t index = Entry.n_sect;
652 
653   if (index == 0) {
654     Res = section_end();
655   } else {
656     DataRefImpl DRI;
657     DRI.d.a = index - 1;
658     Res = section_iterator(SectionRef(DRI, this));
659   }
660 
661   return object_error::success;
662 }
663 
moveSectionNext(DataRefImpl & Sec) const664 void MachOObjectFile::moveSectionNext(DataRefImpl &Sec) const {
665   Sec.d.a++;
666 }
667 
getSectionName(DataRefImpl Sec,StringRef & Result) const668 std::error_code MachOObjectFile::getSectionName(DataRefImpl Sec,
669                                                 StringRef &Result) const {
670   ArrayRef<char> Raw = getSectionRawName(Sec);
671   Result = parseSegmentOrSectionName(Raw.data());
672   return object_error::success;
673 }
674 
getSectionAddress(DataRefImpl Sec,uint64_t & Res) const675 std::error_code MachOObjectFile::getSectionAddress(DataRefImpl Sec,
676                                                    uint64_t &Res) const {
677   if (is64Bit()) {
678     MachO::section_64 Sect = getSection64(Sec);
679     Res = Sect.addr;
680   } else {
681     MachO::section Sect = getSection(Sec);
682     Res = Sect.addr;
683   }
684   return object_error::success;
685 }
686 
getSectionSize(DataRefImpl Sec,uint64_t & Res) const687 std::error_code MachOObjectFile::getSectionSize(DataRefImpl Sec,
688                                                 uint64_t &Res) const {
689   if (is64Bit()) {
690     MachO::section_64 Sect = getSection64(Sec);
691     Res = Sect.size;
692   } else {
693     MachO::section Sect = getSection(Sec);
694     Res = Sect.size;
695   }
696 
697   return object_error::success;
698 }
699 
getSectionContents(DataRefImpl Sec,StringRef & Res) const700 std::error_code MachOObjectFile::getSectionContents(DataRefImpl Sec,
701                                                     StringRef &Res) const {
702   uint32_t Offset;
703   uint64_t Size;
704 
705   if (is64Bit()) {
706     MachO::section_64 Sect = getSection64(Sec);
707     Offset = Sect.offset;
708     Size = Sect.size;
709   } else {
710     MachO::section Sect = getSection(Sec);
711     Offset = Sect.offset;
712     Size = Sect.size;
713   }
714 
715   Res = this->getData().substr(Offset, Size);
716   return object_error::success;
717 }
718 
getSectionAlignment(DataRefImpl Sec,uint64_t & Res) const719 std::error_code MachOObjectFile::getSectionAlignment(DataRefImpl Sec,
720                                                      uint64_t &Res) const {
721   uint32_t Align;
722   if (is64Bit()) {
723     MachO::section_64 Sect = getSection64(Sec);
724     Align = Sect.align;
725   } else {
726     MachO::section Sect = getSection(Sec);
727     Align = Sect.align;
728   }
729 
730   Res = uint64_t(1) << Align;
731   return object_error::success;
732 }
733 
isSectionText(DataRefImpl Sec,bool & Res) const734 std::error_code MachOObjectFile::isSectionText(DataRefImpl Sec,
735                                                bool &Res) const {
736   uint32_t Flags = getSectionFlags(this, Sec);
737   Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
738   return object_error::success;
739 }
740 
isSectionData(DataRefImpl Sec,bool & Result) const741 std::error_code MachOObjectFile::isSectionData(DataRefImpl Sec,
742                                                bool &Result) const {
743   uint32_t Flags = getSectionFlags(this, Sec);
744   unsigned SectionType = Flags & MachO::SECTION_TYPE;
745   Result = !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) &&
746            !(SectionType == MachO::S_ZEROFILL ||
747              SectionType == MachO::S_GB_ZEROFILL);
748   return object_error::success;
749 }
750 
isSectionBSS(DataRefImpl Sec,bool & Result) const751 std::error_code MachOObjectFile::isSectionBSS(DataRefImpl Sec,
752                                               bool &Result) const {
753   uint32_t Flags = getSectionFlags(this, Sec);
754   unsigned SectionType = Flags & MachO::SECTION_TYPE;
755   Result = !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) &&
756            (SectionType == MachO::S_ZEROFILL ||
757             SectionType == MachO::S_GB_ZEROFILL);
758   return object_error::success;
759 }
760 
761 std::error_code
isSectionRequiredForExecution(DataRefImpl Sec,bool & Result) const762 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
763                                                bool &Result) const {
764   // FIXME: Unimplemented.
765   Result = true;
766   return object_error::success;
767 }
768 
isSectionVirtual(DataRefImpl Sec,bool & Result) const769 std::error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
770                                                   bool &Result) const {
771   // FIXME: Unimplemented.
772   Result = false;
773   return object_error::success;
774 }
775 
isSectionZeroInit(DataRefImpl Sec,bool & Res) const776 std::error_code MachOObjectFile::isSectionZeroInit(DataRefImpl Sec,
777                                                    bool &Res) const {
778   uint32_t Flags = getSectionFlags(this, Sec);
779   unsigned SectionType = Flags & MachO::SECTION_TYPE;
780   Res = SectionType == MachO::S_ZEROFILL ||
781     SectionType == MachO::S_GB_ZEROFILL;
782   return object_error::success;
783 }
784 
isSectionReadOnlyData(DataRefImpl Sec,bool & Result) const785 std::error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
786                                                        bool &Result) const {
787   // Consider using the code from isSectionText to look for __const sections.
788   // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
789   // to use section attributes to distinguish code from data.
790 
791   // FIXME: Unimplemented.
792   Result = false;
793   return object_error::success;
794 }
795 
sectionContainsSymbol(DataRefImpl Sec,DataRefImpl Symb,bool & Result) const796 std::error_code MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
797                                                        DataRefImpl Symb,
798                                                        bool &Result) const {
799   SymbolRef::Type ST;
800   this->getSymbolType(Symb, ST);
801   if (ST == SymbolRef::ST_Unknown) {
802     Result = false;
803     return object_error::success;
804   }
805 
806   uint64_t SectBegin, SectEnd;
807   getSectionAddress(Sec, SectBegin);
808   getSectionSize(Sec, SectEnd);
809   SectEnd += SectBegin;
810 
811   uint64_t SymAddr;
812   getSymbolAddress(Symb, SymAddr);
813   Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
814 
815   return object_error::success;
816 }
817 
section_rel_begin(DataRefImpl Sec) const818 relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
819   DataRefImpl Ret;
820   Ret.d.a = Sec.d.a;
821   Ret.d.b = 0;
822   return relocation_iterator(RelocationRef(Ret, this));
823 }
824 
825 relocation_iterator
section_rel_end(DataRefImpl Sec) const826 MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
827   uint32_t Num;
828   if (is64Bit()) {
829     MachO::section_64 Sect = getSection64(Sec);
830     Num = Sect.nreloc;
831   } else {
832     MachO::section Sect = getSection(Sec);
833     Num = Sect.nreloc;
834   }
835 
836   DataRefImpl Ret;
837   Ret.d.a = Sec.d.a;
838   Ret.d.b = Num;
839   return relocation_iterator(RelocationRef(Ret, this));
840 }
841 
moveRelocationNext(DataRefImpl & Rel) const842 void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
843   ++Rel.d.b;
844 }
845 
getRelocationAddress(DataRefImpl Rel,uint64_t & Res) const846 std::error_code MachOObjectFile::getRelocationAddress(DataRefImpl Rel,
847                                                       uint64_t &Res) const {
848   uint64_t Offset;
849   getRelocationOffset(Rel, Offset);
850 
851   DataRefImpl Sec;
852   Sec.d.a = Rel.d.a;
853   uint64_t SecAddress;
854   getSectionAddress(Sec, SecAddress);
855   Res = SecAddress + Offset;
856   return object_error::success;
857 }
858 
getRelocationOffset(DataRefImpl Rel,uint64_t & Res) const859 std::error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
860                                                      uint64_t &Res) const {
861   assert(getHeader().filetype == MachO::MH_OBJECT &&
862          "Only implemented for MH_OBJECT");
863   MachO::any_relocation_info RE = getRelocation(Rel);
864   Res = getAnyRelocationAddress(RE);
865   return object_error::success;
866 }
867 
868 symbol_iterator
getRelocationSymbol(DataRefImpl Rel) const869 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
870   MachO::any_relocation_info RE = getRelocation(Rel);
871   if (isRelocationScattered(RE))
872     return symbol_end();
873 
874   uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
875   bool isExtern = getPlainRelocationExternal(RE);
876   if (!isExtern)
877     return symbol_end();
878 
879   MachO::symtab_command S = getSymtabLoadCommand();
880   unsigned SymbolTableEntrySize = is64Bit() ?
881     sizeof(MachO::nlist_64) :
882     sizeof(MachO::nlist);
883   uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
884   DataRefImpl Sym;
885   Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
886   return symbol_iterator(SymbolRef(Sym, this));
887 }
888 
getRelocationType(DataRefImpl Rel,uint64_t & Res) const889 std::error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
890                                                    uint64_t &Res) const {
891   MachO::any_relocation_info RE = getRelocation(Rel);
892   Res = getAnyRelocationType(RE);
893   return object_error::success;
894 }
895 
896 std::error_code
getRelocationTypeName(DataRefImpl Rel,SmallVectorImpl<char> & Result) const897 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
898                                        SmallVectorImpl<char> &Result) const {
899   StringRef res;
900   uint64_t RType;
901   getRelocationType(Rel, RType);
902 
903   unsigned Arch = this->getArch();
904 
905   switch (Arch) {
906     case Triple::x86: {
907       static const char *const Table[] =  {
908         "GENERIC_RELOC_VANILLA",
909         "GENERIC_RELOC_PAIR",
910         "GENERIC_RELOC_SECTDIFF",
911         "GENERIC_RELOC_PB_LA_PTR",
912         "GENERIC_RELOC_LOCAL_SECTDIFF",
913         "GENERIC_RELOC_TLV" };
914 
915       if (RType > 5)
916         res = "Unknown";
917       else
918         res = Table[RType];
919       break;
920     }
921     case Triple::x86_64: {
922       static const char *const Table[] =  {
923         "X86_64_RELOC_UNSIGNED",
924         "X86_64_RELOC_SIGNED",
925         "X86_64_RELOC_BRANCH",
926         "X86_64_RELOC_GOT_LOAD",
927         "X86_64_RELOC_GOT",
928         "X86_64_RELOC_SUBTRACTOR",
929         "X86_64_RELOC_SIGNED_1",
930         "X86_64_RELOC_SIGNED_2",
931         "X86_64_RELOC_SIGNED_4",
932         "X86_64_RELOC_TLV" };
933 
934       if (RType > 9)
935         res = "Unknown";
936       else
937         res = Table[RType];
938       break;
939     }
940     case Triple::arm: {
941       static const char *const Table[] =  {
942         "ARM_RELOC_VANILLA",
943         "ARM_RELOC_PAIR",
944         "ARM_RELOC_SECTDIFF",
945         "ARM_RELOC_LOCAL_SECTDIFF",
946         "ARM_RELOC_PB_LA_PTR",
947         "ARM_RELOC_BR24",
948         "ARM_THUMB_RELOC_BR22",
949         "ARM_THUMB_32BIT_BRANCH",
950         "ARM_RELOC_HALF",
951         "ARM_RELOC_HALF_SECTDIFF" };
952 
953       if (RType > 9)
954         res = "Unknown";
955       else
956         res = Table[RType];
957       break;
958     }
959     case Triple::arm64:
960     case Triple::aarch64: {
961       static const char *const Table[] = {
962         "ARM64_RELOC_UNSIGNED",           "ARM64_RELOC_SUBTRACTOR",
963         "ARM64_RELOC_BRANCH26",           "ARM64_RELOC_PAGE21",
964         "ARM64_RELOC_PAGEOFF12",          "ARM64_RELOC_GOT_LOAD_PAGE21",
965         "ARM64_RELOC_GOT_LOAD_PAGEOFF12", "ARM64_RELOC_POINTER_TO_GOT",
966         "ARM64_RELOC_TLVP_LOAD_PAGE21",   "ARM64_RELOC_TLVP_LOAD_PAGEOFF12",
967         "ARM64_RELOC_ADDEND"
968       };
969 
970       if (RType >= array_lengthof(Table))
971         res = "Unknown";
972       else
973         res = Table[RType];
974       break;
975     }
976     case Triple::ppc: {
977       static const char *const Table[] =  {
978         "PPC_RELOC_VANILLA",
979         "PPC_RELOC_PAIR",
980         "PPC_RELOC_BR14",
981         "PPC_RELOC_BR24",
982         "PPC_RELOC_HI16",
983         "PPC_RELOC_LO16",
984         "PPC_RELOC_HA16",
985         "PPC_RELOC_LO14",
986         "PPC_RELOC_SECTDIFF",
987         "PPC_RELOC_PB_LA_PTR",
988         "PPC_RELOC_HI16_SECTDIFF",
989         "PPC_RELOC_LO16_SECTDIFF",
990         "PPC_RELOC_HA16_SECTDIFF",
991         "PPC_RELOC_JBSR",
992         "PPC_RELOC_LO14_SECTDIFF",
993         "PPC_RELOC_LOCAL_SECTDIFF" };
994 
995       if (RType > 15)
996         res = "Unknown";
997       else
998         res = Table[RType];
999       break;
1000     }
1001     case Triple::UnknownArch:
1002       res = "Unknown";
1003       break;
1004   }
1005   Result.append(res.begin(), res.end());
1006   return object_error::success;
1007 }
1008 
1009 std::error_code
getRelocationValueString(DataRefImpl Rel,SmallVectorImpl<char> & Result) const1010 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
1011                                           SmallVectorImpl<char> &Result) const {
1012   MachO::any_relocation_info RE = getRelocation(Rel);
1013 
1014   unsigned Arch = this->getArch();
1015 
1016   std::string fmtbuf;
1017   raw_string_ostream fmt(fmtbuf);
1018   unsigned Type = this->getAnyRelocationType(RE);
1019   bool IsPCRel = this->getAnyRelocationPCRel(RE);
1020 
1021   // Determine any addends that should be displayed with the relocation.
1022   // These require decoding the relocation type, which is triple-specific.
1023 
1024   // X86_64 has entirely custom relocation types.
1025   if (Arch == Triple::x86_64) {
1026     bool isPCRel = getAnyRelocationPCRel(RE);
1027 
1028     switch (Type) {
1029       case MachO::X86_64_RELOC_GOT_LOAD:
1030       case MachO::X86_64_RELOC_GOT: {
1031         printRelocationTargetName(this, RE, fmt);
1032         fmt << "@GOT";
1033         if (isPCRel) fmt << "PCREL";
1034         break;
1035       }
1036       case MachO::X86_64_RELOC_SUBTRACTOR: {
1037         DataRefImpl RelNext = Rel;
1038         moveRelocationNext(RelNext);
1039         MachO::any_relocation_info RENext = getRelocation(RelNext);
1040 
1041         // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
1042         // X86_64_RELOC_UNSIGNED.
1043         // NOTE: Scattered relocations don't exist on x86_64.
1044         unsigned RType = getAnyRelocationType(RENext);
1045         if (RType != MachO::X86_64_RELOC_UNSIGNED)
1046           report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1047                              "X86_64_RELOC_SUBTRACTOR.");
1048 
1049         // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
1050         // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
1051         printRelocationTargetName(this, RENext, fmt);
1052         fmt << "-";
1053         printRelocationTargetName(this, RE, fmt);
1054         break;
1055       }
1056       case MachO::X86_64_RELOC_TLV:
1057         printRelocationTargetName(this, RE, fmt);
1058         fmt << "@TLV";
1059         if (isPCRel) fmt << "P";
1060         break;
1061       case MachO::X86_64_RELOC_SIGNED_1:
1062         printRelocationTargetName(this, RE, fmt);
1063         fmt << "-1";
1064         break;
1065       case MachO::X86_64_RELOC_SIGNED_2:
1066         printRelocationTargetName(this, RE, fmt);
1067         fmt << "-2";
1068         break;
1069       case MachO::X86_64_RELOC_SIGNED_4:
1070         printRelocationTargetName(this, RE, fmt);
1071         fmt << "-4";
1072         break;
1073       default:
1074         printRelocationTargetName(this, RE, fmt);
1075         break;
1076     }
1077   // X86 and ARM share some relocation types in common.
1078   } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1079              Arch == Triple::ppc) {
1080     // Generic relocation types...
1081     switch (Type) {
1082       case MachO::GENERIC_RELOC_PAIR: // prints no info
1083         return object_error::success;
1084       case MachO::GENERIC_RELOC_SECTDIFF: {
1085         DataRefImpl RelNext = Rel;
1086         moveRelocationNext(RelNext);
1087         MachO::any_relocation_info RENext = getRelocation(RelNext);
1088 
1089         // X86 sect diff's must be followed by a relocation of type
1090         // GENERIC_RELOC_PAIR.
1091         unsigned RType = getAnyRelocationType(RENext);
1092 
1093         if (RType != MachO::GENERIC_RELOC_PAIR)
1094           report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1095                              "GENERIC_RELOC_SECTDIFF.");
1096 
1097         printRelocationTargetName(this, RE, fmt);
1098         fmt << "-";
1099         printRelocationTargetName(this, RENext, fmt);
1100         break;
1101       }
1102     }
1103 
1104     if (Arch == Triple::x86 || Arch == Triple::ppc) {
1105       switch (Type) {
1106         case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
1107           DataRefImpl RelNext = Rel;
1108           moveRelocationNext(RelNext);
1109           MachO::any_relocation_info RENext = getRelocation(RelNext);
1110 
1111           // X86 sect diff's must be followed by a relocation of type
1112           // GENERIC_RELOC_PAIR.
1113           unsigned RType = getAnyRelocationType(RENext);
1114           if (RType != MachO::GENERIC_RELOC_PAIR)
1115             report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1116                                "GENERIC_RELOC_LOCAL_SECTDIFF.");
1117 
1118           printRelocationTargetName(this, RE, fmt);
1119           fmt << "-";
1120           printRelocationTargetName(this, RENext, fmt);
1121           break;
1122         }
1123         case MachO::GENERIC_RELOC_TLV: {
1124           printRelocationTargetName(this, RE, fmt);
1125           fmt << "@TLV";
1126           if (IsPCRel) fmt << "P";
1127           break;
1128         }
1129         default:
1130           printRelocationTargetName(this, RE, fmt);
1131       }
1132     } else { // ARM-specific relocations
1133       switch (Type) {
1134         case MachO::ARM_RELOC_HALF:
1135         case MachO::ARM_RELOC_HALF_SECTDIFF: {
1136           // Half relocations steal a bit from the length field to encode
1137           // whether this is an upper16 or a lower16 relocation.
1138           bool isUpper = getAnyRelocationLength(RE) >> 1;
1139 
1140           if (isUpper)
1141             fmt << ":upper16:(";
1142           else
1143             fmt << ":lower16:(";
1144           printRelocationTargetName(this, RE, fmt);
1145 
1146           DataRefImpl RelNext = Rel;
1147           moveRelocationNext(RelNext);
1148           MachO::any_relocation_info RENext = getRelocation(RelNext);
1149 
1150           // ARM half relocs must be followed by a relocation of type
1151           // ARM_RELOC_PAIR.
1152           unsigned RType = getAnyRelocationType(RENext);
1153           if (RType != MachO::ARM_RELOC_PAIR)
1154             report_fatal_error("Expected ARM_RELOC_PAIR after "
1155                                "ARM_RELOC_HALF");
1156 
1157           // NOTE: The half of the target virtual address is stashed in the
1158           // address field of the secondary relocation, but we can't reverse
1159           // engineer the constant offset from it without decoding the movw/movt
1160           // instruction to find the other half in its immediate field.
1161 
1162           // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1163           // symbol/section pointer of the follow-on relocation.
1164           if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
1165             fmt << "-";
1166             printRelocationTargetName(this, RENext, fmt);
1167           }
1168 
1169           fmt << ")";
1170           break;
1171         }
1172         default: {
1173           printRelocationTargetName(this, RE, fmt);
1174         }
1175       }
1176     }
1177   } else
1178     printRelocationTargetName(this, RE, fmt);
1179 
1180   fmt.flush();
1181   Result.append(fmtbuf.begin(), fmtbuf.end());
1182   return object_error::success;
1183 }
1184 
getRelocationHidden(DataRefImpl Rel,bool & Result) const1185 std::error_code MachOObjectFile::getRelocationHidden(DataRefImpl Rel,
1186                                                      bool &Result) const {
1187   unsigned Arch = getArch();
1188   uint64_t Type;
1189   getRelocationType(Rel, Type);
1190 
1191   Result = false;
1192 
1193   // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1194   // is always hidden.
1195   if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1196     if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
1197   } else if (Arch == Triple::x86_64) {
1198     // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1199     // an X86_64_RELOC_SUBTRACTOR.
1200     if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
1201       DataRefImpl RelPrev = Rel;
1202       RelPrev.d.a--;
1203       uint64_t PrevType;
1204       getRelocationType(RelPrev, PrevType);
1205       if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
1206         Result = true;
1207     }
1208   }
1209 
1210   return object_error::success;
1211 }
1212 
getLibraryNext(DataRefImpl LibData,LibraryRef & Res) const1213 std::error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1214                                                 LibraryRef &Res) const {
1215   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1216 }
1217 
getLibraryPath(DataRefImpl LibData,StringRef & Res) const1218 std::error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1219                                                 StringRef &Res) const {
1220   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1221 }
1222 
1223 //
1224 // guessLibraryShortName() is passed a name of a dynamic library and returns a
1225 // guess on what the short name is.  Then name is returned as a substring of the
1226 // StringRef Name passed in.  The name of the dynamic library is recognized as
1227 // a framework if it has one of the two following forms:
1228 //      Foo.framework/Versions/A/Foo
1229 //      Foo.framework/Foo
1230 // Where A and Foo can be any string.  And may contain a trailing suffix
1231 // starting with an underbar.  If the Name is recognized as a framework then
1232 // isFramework is set to true else it is set to false.  If the Name has a
1233 // suffix then Suffix is set to the substring in Name that contains the suffix
1234 // else it is set to a NULL StringRef.
1235 //
1236 // The Name of the dynamic library is recognized as a library name if it has
1237 // one of the two following forms:
1238 //      libFoo.A.dylib
1239 //      libFoo.dylib
1240 // The library may have a suffix trailing the name Foo of the form:
1241 //      libFoo_profile.A.dylib
1242 //      libFoo_profile.dylib
1243 //
1244 // The Name of the dynamic library is also recognized as a library name if it
1245 // has the following form:
1246 //      Foo.qtx
1247 //
1248 // If the Name of the dynamic library is none of the forms above then a NULL
1249 // StringRef is returned.
1250 //
guessLibraryShortName(StringRef Name,bool & isFramework,StringRef & Suffix)1251 StringRef MachOObjectFile::guessLibraryShortName(StringRef Name,
1252                                                  bool &isFramework,
1253                                                  StringRef &Suffix) {
1254   StringRef Foo, F, DotFramework, V, Dylib, Lib, Dot, Qtx;
1255   size_t a, b, c, d, Idx;
1256 
1257   isFramework = false;
1258   Suffix = StringRef();
1259 
1260   // Pull off the last component and make Foo point to it
1261   a = Name.rfind('/');
1262   if (a == Name.npos || a == 0)
1263     goto guess_library;
1264   Foo = Name.slice(a+1, Name.npos);
1265 
1266   // Look for a suffix starting with a '_'
1267   Idx = Foo.rfind('_');
1268   if (Idx != Foo.npos && Foo.size() >= 2) {
1269     Suffix = Foo.slice(Idx, Foo.npos);
1270     Foo = Foo.slice(0, Idx);
1271   }
1272 
1273   // First look for the form Foo.framework/Foo
1274   b = Name.rfind('/', a);
1275   if (b == Name.npos)
1276     Idx = 0;
1277   else
1278     Idx = b+1;
1279   F = Name.slice(Idx, Idx + Foo.size());
1280   DotFramework = Name.slice(Idx + Foo.size(),
1281                             Idx + Foo.size() + sizeof(".framework/")-1);
1282   if (F == Foo && DotFramework == ".framework/") {
1283     isFramework = true;
1284     return Foo;
1285   }
1286 
1287   // Next look for the form Foo.framework/Versions/A/Foo
1288   if (b == Name.npos)
1289     goto guess_library;
1290   c =  Name.rfind('/', b);
1291   if (c == Name.npos || c == 0)
1292     goto guess_library;
1293   V = Name.slice(c+1, Name.npos);
1294   if (!V.startswith("Versions/"))
1295     goto guess_library;
1296   d =  Name.rfind('/', c);
1297   if (d == Name.npos)
1298     Idx = 0;
1299   else
1300     Idx = d+1;
1301   F = Name.slice(Idx, Idx + Foo.size());
1302   DotFramework = Name.slice(Idx + Foo.size(),
1303                             Idx + Foo.size() + sizeof(".framework/")-1);
1304   if (F == Foo && DotFramework == ".framework/") {
1305     isFramework = true;
1306     return Foo;
1307   }
1308 
1309 guess_library:
1310   // pull off the suffix after the "." and make a point to it
1311   a = Name.rfind('.');
1312   if (a == Name.npos || a == 0)
1313     return StringRef();
1314   Dylib = Name.slice(a, Name.npos);
1315   if (Dylib != ".dylib")
1316     goto guess_qtx;
1317 
1318   // First pull off the version letter for the form Foo.A.dylib if any.
1319   if (a >= 3) {
1320     Dot = Name.slice(a-2, a-1);
1321     if (Dot == ".")
1322       a = a - 2;
1323   }
1324 
1325   b = Name.rfind('/', a);
1326   if (b == Name.npos)
1327     b = 0;
1328   else
1329     b = b+1;
1330   // ignore any suffix after an underbar like Foo_profile.A.dylib
1331   Idx = Name.find('_', b);
1332   if (Idx != Name.npos && Idx != b) {
1333     Lib = Name.slice(b, Idx);
1334     Suffix = Name.slice(Idx, a);
1335   }
1336   else
1337     Lib = Name.slice(b, a);
1338   // There are incorrect library names of the form:
1339   // libATS.A_profile.dylib so check for these.
1340   if (Lib.size() >= 3) {
1341     Dot = Lib.slice(Lib.size()-2, Lib.size()-1);
1342     if (Dot == ".")
1343       Lib = Lib.slice(0, Lib.size()-2);
1344   }
1345   return Lib;
1346 
1347 guess_qtx:
1348   Qtx = Name.slice(a, Name.npos);
1349   if (Qtx != ".qtx")
1350     return StringRef();
1351   b = Name.rfind('/', a);
1352   if (b == Name.npos)
1353     Lib = Name.slice(0, a);
1354   else
1355     Lib = Name.slice(b+1, a);
1356   // There are library names of the form: QT.A.qtx so check for these.
1357   if (Lib.size() >= 3) {
1358     Dot = Lib.slice(Lib.size()-2, Lib.size()-1);
1359     if (Dot == ".")
1360       Lib = Lib.slice(0, Lib.size()-2);
1361   }
1362   return Lib;
1363 }
1364 
1365 // getLibraryShortNameByIndex() is used to get the short name of the library
1366 // for an undefined symbol in a linked Mach-O binary that was linked with the
1367 // normal two-level namespace default (that is MH_TWOLEVEL in the header).
1368 // It is passed the index (0 - based) of the library as translated from
1369 // GET_LIBRARY_ORDINAL (1 - based).
getLibraryShortNameByIndex(unsigned Index,StringRef & Res)1370 std::error_code MachOObjectFile::getLibraryShortNameByIndex(unsigned Index,
1371                                                             StringRef &Res) {
1372   if (Index >= Libraries.size())
1373     return object_error::parse_failed;
1374 
1375   MachO::dylib_command D =
1376     getStruct<MachO::dylib_command>(this, Libraries[Index]);
1377   if (D.dylib.name >= D.cmdsize)
1378     return object_error::parse_failed;
1379 
1380   // If the cache of LibrariesShortNames is not built up do that first for
1381   // all the Libraries.
1382   if (LibrariesShortNames.size() == 0) {
1383     for (unsigned i = 0; i < Libraries.size(); i++) {
1384       MachO::dylib_command D =
1385         getStruct<MachO::dylib_command>(this, Libraries[i]);
1386       if (D.dylib.name >= D.cmdsize) {
1387         LibrariesShortNames.push_back(StringRef());
1388         continue;
1389       }
1390       const char *P = (const char *)(Libraries[i]) + D.dylib.name;
1391       StringRef Name = StringRef(P);
1392       StringRef Suffix;
1393       bool isFramework;
1394       StringRef shortName = guessLibraryShortName(Name, isFramework, Suffix);
1395       if (shortName == StringRef())
1396         LibrariesShortNames.push_back(Name);
1397       else
1398         LibrariesShortNames.push_back(shortName);
1399     }
1400   }
1401 
1402   Res = LibrariesShortNames[Index];
1403   return object_error::success;
1404 }
1405 
symbol_begin_impl() const1406 basic_symbol_iterator MachOObjectFile::symbol_begin_impl() const {
1407   return getSymbolByIndex(0);
1408 }
1409 
symbol_end_impl() const1410 basic_symbol_iterator MachOObjectFile::symbol_end_impl() const {
1411   DataRefImpl DRI;
1412   if (!SymtabLoadCmd)
1413     return basic_symbol_iterator(SymbolRef(DRI, this));
1414 
1415   MachO::symtab_command Symtab = getSymtabLoadCommand();
1416   unsigned SymbolTableEntrySize = is64Bit() ?
1417     sizeof(MachO::nlist_64) :
1418     sizeof(MachO::nlist);
1419   unsigned Offset = Symtab.symoff +
1420     Symtab.nsyms * SymbolTableEntrySize;
1421   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1422   return basic_symbol_iterator(SymbolRef(DRI, this));
1423 }
1424 
getSymbolByIndex(unsigned Index) const1425 basic_symbol_iterator MachOObjectFile::getSymbolByIndex(unsigned Index) const {
1426   DataRefImpl DRI;
1427   if (!SymtabLoadCmd)
1428     return basic_symbol_iterator(SymbolRef(DRI, this));
1429 
1430   MachO::symtab_command Symtab = getSymtabLoadCommand();
1431   assert(Index < Symtab.nsyms && "Requested symbol index is out of range.");
1432   unsigned SymbolTableEntrySize =
1433     is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist);
1434   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
1435   DRI.p += Index * SymbolTableEntrySize;
1436   return basic_symbol_iterator(SymbolRef(DRI, this));
1437 }
1438 
section_begin() const1439 section_iterator MachOObjectFile::section_begin() const {
1440   DataRefImpl DRI;
1441   return section_iterator(SectionRef(DRI, this));
1442 }
1443 
section_end() const1444 section_iterator MachOObjectFile::section_end() const {
1445   DataRefImpl DRI;
1446   DRI.d.a = Sections.size();
1447   return section_iterator(SectionRef(DRI, this));
1448 }
1449 
needed_library_begin() const1450 library_iterator MachOObjectFile::needed_library_begin() const {
1451   // TODO: implement
1452   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1453 }
1454 
needed_library_end() const1455 library_iterator MachOObjectFile::needed_library_end() const {
1456   // TODO: implement
1457   report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1458 }
1459 
getBytesInAddress() const1460 uint8_t MachOObjectFile::getBytesInAddress() const {
1461   return is64Bit() ? 8 : 4;
1462 }
1463 
getFileFormatName() const1464 StringRef MachOObjectFile::getFileFormatName() const {
1465   unsigned CPUType = getCPUType(this);
1466   if (!is64Bit()) {
1467     switch (CPUType) {
1468     case llvm::MachO::CPU_TYPE_I386:
1469       return "Mach-O 32-bit i386";
1470     case llvm::MachO::CPU_TYPE_ARM:
1471       return "Mach-O arm";
1472     case llvm::MachO::CPU_TYPE_POWERPC:
1473       return "Mach-O 32-bit ppc";
1474     default:
1475       assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
1476              "64-bit object file when we're not 64-bit?");
1477       return "Mach-O 32-bit unknown";
1478     }
1479   }
1480 
1481   // Make sure the cpu type has the correct mask.
1482   assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
1483          == llvm::MachO::CPU_ARCH_ABI64 &&
1484          "32-bit object file when we're 64-bit?");
1485 
1486   switch (CPUType) {
1487   case llvm::MachO::CPU_TYPE_X86_64:
1488     return "Mach-O 64-bit x86-64";
1489   case llvm::MachO::CPU_TYPE_ARM64:
1490     return "Mach-O arm64";
1491   case llvm::MachO::CPU_TYPE_POWERPC64:
1492     return "Mach-O 64-bit ppc64";
1493   default:
1494     return "Mach-O 64-bit unknown";
1495   }
1496 }
1497 
getArch(uint32_t CPUType)1498 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1499   switch (CPUType) {
1500   case llvm::MachO::CPU_TYPE_I386:
1501     return Triple::x86;
1502   case llvm::MachO::CPU_TYPE_X86_64:
1503     return Triple::x86_64;
1504   case llvm::MachO::CPU_TYPE_ARM:
1505     return Triple::arm;
1506   case llvm::MachO::CPU_TYPE_ARM64:
1507     return Triple::arm64;
1508   case llvm::MachO::CPU_TYPE_POWERPC:
1509     return Triple::ppc;
1510   case llvm::MachO::CPU_TYPE_POWERPC64:
1511     return Triple::ppc64;
1512   default:
1513     return Triple::UnknownArch;
1514   }
1515 }
1516 
getArch(uint32_t CPUType,uint32_t CPUSubType)1517 Triple MachOObjectFile::getArch(uint32_t CPUType, uint32_t CPUSubType) {
1518   switch (CPUType) {
1519   case MachO::CPU_TYPE_I386:
1520     switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
1521     case MachO::CPU_SUBTYPE_I386_ALL:
1522       return Triple("i386-apple-darwin");
1523     default:
1524       return Triple();
1525     }
1526   case MachO::CPU_TYPE_X86_64:
1527     switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
1528     case MachO::CPU_SUBTYPE_X86_64_ALL:
1529       return Triple("x86_64-apple-darwin");
1530     case MachO::CPU_SUBTYPE_X86_64_H:
1531       return Triple("x86_64h-apple-darwin");
1532     default:
1533       return Triple();
1534     }
1535   case MachO::CPU_TYPE_ARM:
1536     switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
1537     case MachO::CPU_SUBTYPE_ARM_V4T:
1538       return Triple("armv4t-apple-darwin");
1539     case MachO::CPU_SUBTYPE_ARM_V5TEJ:
1540       return Triple("armv5e-apple-darwin");
1541     case MachO::CPU_SUBTYPE_ARM_V6:
1542       return Triple("armv6-apple-darwin");
1543     case MachO::CPU_SUBTYPE_ARM_V6M:
1544       return Triple("armv6m-apple-darwin");
1545     case MachO::CPU_SUBTYPE_ARM_V7EM:
1546       return Triple("armv7em-apple-darwin");
1547     case MachO::CPU_SUBTYPE_ARM_V7K:
1548       return Triple("armv7k-apple-darwin");
1549     case MachO::CPU_SUBTYPE_ARM_V7M:
1550       return Triple("armv7m-apple-darwin");
1551     case MachO::CPU_SUBTYPE_ARM_V7S:
1552       return Triple("armv7s-apple-darwin");
1553     default:
1554       return Triple();
1555     }
1556   case MachO::CPU_TYPE_ARM64:
1557     switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
1558     case MachO::CPU_SUBTYPE_ARM64_ALL:
1559       return Triple("arm64-apple-darwin");
1560     default:
1561       return Triple();
1562     }
1563   case MachO::CPU_TYPE_POWERPC:
1564     switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
1565     case MachO::CPU_SUBTYPE_POWERPC_ALL:
1566       return Triple("ppc-apple-darwin");
1567     default:
1568       return Triple();
1569     }
1570   case MachO::CPU_TYPE_POWERPC64:
1571     switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
1572     case MachO::CPU_SUBTYPE_POWERPC_ALL:
1573       return Triple("ppc64-apple-darwin");
1574     default:
1575       return Triple();
1576     }
1577   default:
1578     return Triple();
1579   }
1580 }
1581 
getHostArch()1582 Triple MachOObjectFile::getHostArch() {
1583   return Triple(sys::getDefaultTargetTriple());
1584 }
1585 
getArch(StringRef ArchFlag)1586 Triple MachOObjectFile::getArch(StringRef ArchFlag) {
1587   if (ArchFlag == "i386")
1588     return Triple("i386-apple-darwin");
1589   else if (ArchFlag == "x86_64")
1590     return Triple("x86_64-apple-darwin");
1591   else if (ArchFlag == "x86_64h")
1592     return Triple("x86_64h-apple-darwin");
1593   else if (ArchFlag == "armv4t" || ArchFlag == "arm")
1594     return Triple("armv4t-apple-darwin");
1595   else if (ArchFlag == "armv5e")
1596     return Triple("armv5e-apple-darwin");
1597   else if (ArchFlag == "armv6")
1598     return Triple("armv6-apple-darwin");
1599   else if (ArchFlag == "armv6m")
1600     return Triple("armv6m-apple-darwin");
1601   else if (ArchFlag == "armv7em")
1602     return Triple("armv7em-apple-darwin");
1603   else if (ArchFlag == "armv7k")
1604     return Triple("armv7k-apple-darwin");
1605   else if (ArchFlag == "armv7k")
1606     return Triple("armv7m-apple-darwin");
1607   else if (ArchFlag == "armv7s")
1608     return Triple("armv7s-apple-darwin");
1609   else if (ArchFlag == "arm64")
1610     return Triple("arm64-apple-darwin");
1611   else if (ArchFlag == "ppc")
1612     return Triple("ppc-apple-darwin");
1613   else if (ArchFlag == "ppc64")
1614     return Triple("ppc64-apple-darwin");
1615   else
1616     return Triple();
1617 }
1618 
getArch() const1619 unsigned MachOObjectFile::getArch() const {
1620   return getArch(getCPUType(this));
1621 }
1622 
getLoadName() const1623 StringRef MachOObjectFile::getLoadName() const {
1624   // TODO: Implement
1625   report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1626 }
1627 
section_rel_begin(unsigned Index) const1628 relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
1629   DataRefImpl DRI;
1630   DRI.d.a = Index;
1631   return section_rel_begin(DRI);
1632 }
1633 
section_rel_end(unsigned Index) const1634 relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
1635   DataRefImpl DRI;
1636   DRI.d.a = Index;
1637   return section_rel_end(DRI);
1638 }
1639 
begin_dices() const1640 dice_iterator MachOObjectFile::begin_dices() const {
1641   DataRefImpl DRI;
1642   if (!DataInCodeLoadCmd)
1643     return dice_iterator(DiceRef(DRI, this));
1644 
1645   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1646   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
1647   return dice_iterator(DiceRef(DRI, this));
1648 }
1649 
end_dices() const1650 dice_iterator MachOObjectFile::end_dices() const {
1651   DataRefImpl DRI;
1652   if (!DataInCodeLoadCmd)
1653     return dice_iterator(DiceRef(DRI, this));
1654 
1655   MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1656   unsigned Offset = DicLC.dataoff + DicLC.datasize;
1657   DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1658   return dice_iterator(DiceRef(DRI, this));
1659 }
1660 
1661 StringRef
getSectionFinalSegmentName(DataRefImpl Sec) const1662 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1663   ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1664   return parseSegmentOrSectionName(Raw.data());
1665 }
1666 
1667 ArrayRef<char>
getSectionRawName(DataRefImpl Sec) const1668 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1669   const section_base *Base =
1670     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1671   return ArrayRef<char>(Base->sectname);
1672 }
1673 
1674 ArrayRef<char>
getSectionRawFinalSegmentName(DataRefImpl Sec) const1675 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1676   const section_base *Base =
1677     reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1678   return ArrayRef<char>(Base->segname);
1679 }
1680 
1681 bool
isRelocationScattered(const MachO::any_relocation_info & RE) const1682 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
1683   const {
1684   if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
1685     return false;
1686   return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
1687 }
1688 
getPlainRelocationSymbolNum(const MachO::any_relocation_info & RE) const1689 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1690     const MachO::any_relocation_info &RE) const {
1691   if (isLittleEndian())
1692     return RE.r_word1 & 0xffffff;
1693   return RE.r_word1 >> 8;
1694 }
1695 
getPlainRelocationExternal(const MachO::any_relocation_info & RE) const1696 bool MachOObjectFile::getPlainRelocationExternal(
1697     const MachO::any_relocation_info &RE) const {
1698   if (isLittleEndian())
1699     return (RE.r_word1 >> 27) & 1;
1700   return (RE.r_word1 >> 4) & 1;
1701 }
1702 
getScatteredRelocationScattered(const MachO::any_relocation_info & RE) const1703 bool MachOObjectFile::getScatteredRelocationScattered(
1704     const MachO::any_relocation_info &RE) const {
1705   return RE.r_word0 >> 31;
1706 }
1707 
getScatteredRelocationValue(const MachO::any_relocation_info & RE) const1708 uint32_t MachOObjectFile::getScatteredRelocationValue(
1709     const MachO::any_relocation_info &RE) const {
1710   return RE.r_word1;
1711 }
1712 
getAnyRelocationAddress(const MachO::any_relocation_info & RE) const1713 unsigned MachOObjectFile::getAnyRelocationAddress(
1714     const MachO::any_relocation_info &RE) const {
1715   if (isRelocationScattered(RE))
1716     return getScatteredRelocationAddress(RE);
1717   return getPlainRelocationAddress(RE);
1718 }
1719 
getAnyRelocationPCRel(const MachO::any_relocation_info & RE) const1720 unsigned MachOObjectFile::getAnyRelocationPCRel(
1721     const MachO::any_relocation_info &RE) const {
1722   if (isRelocationScattered(RE))
1723     return getScatteredRelocationPCRel(this, RE);
1724   return getPlainRelocationPCRel(this, RE);
1725 }
1726 
getAnyRelocationLength(const MachO::any_relocation_info & RE) const1727 unsigned MachOObjectFile::getAnyRelocationLength(
1728     const MachO::any_relocation_info &RE) const {
1729   if (isRelocationScattered(RE))
1730     return getScatteredRelocationLength(RE);
1731   return getPlainRelocationLength(this, RE);
1732 }
1733 
1734 unsigned
getAnyRelocationType(const MachO::any_relocation_info & RE) const1735 MachOObjectFile::getAnyRelocationType(
1736                                    const MachO::any_relocation_info &RE) const {
1737   if (isRelocationScattered(RE))
1738     return getScatteredRelocationType(RE);
1739   return getPlainRelocationType(this, RE);
1740 }
1741 
1742 SectionRef
getRelocationSection(const MachO::any_relocation_info & RE) const1743 MachOObjectFile::getRelocationSection(
1744                                    const MachO::any_relocation_info &RE) const {
1745   if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1746     return *section_end();
1747   unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1748   DataRefImpl DRI;
1749   DRI.d.a = SecNum;
1750   return SectionRef(DRI, this);
1751 }
1752 
1753 MachOObjectFile::LoadCommandInfo
getFirstLoadCommandInfo() const1754 MachOObjectFile::getFirstLoadCommandInfo() const {
1755   MachOObjectFile::LoadCommandInfo Load;
1756 
1757   unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
1758                                     sizeof(MachO::mach_header);
1759   Load.Ptr = getPtr(this, HeaderSize);
1760   Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
1761   return Load;
1762 }
1763 
1764 MachOObjectFile::LoadCommandInfo
getNextLoadCommandInfo(const LoadCommandInfo & L) const1765 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1766   MachOObjectFile::LoadCommandInfo Next;
1767   Next.Ptr = L.Ptr + L.C.cmdsize;
1768   Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
1769   return Next;
1770 }
1771 
getSection(DataRefImpl DRI) const1772 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
1773   return getStruct<MachO::section>(this, Sections[DRI.d.a]);
1774 }
1775 
getSection64(DataRefImpl DRI) const1776 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1777   return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
1778 }
1779 
getSection(const LoadCommandInfo & L,unsigned Index) const1780 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
1781                                            unsigned Index) const {
1782   const char *Sec = getSectionPtr(this, L, Index);
1783   return getStruct<MachO::section>(this, Sec);
1784 }
1785 
getSection64(const LoadCommandInfo & L,unsigned Index) const1786 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1787                                                 unsigned Index) const {
1788   const char *Sec = getSectionPtr(this, L, Index);
1789   return getStruct<MachO::section_64>(this, Sec);
1790 }
1791 
1792 MachO::nlist
getSymbolTableEntry(DataRefImpl DRI) const1793 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1794   const char *P = reinterpret_cast<const char *>(DRI.p);
1795   return getStruct<MachO::nlist>(this, P);
1796 }
1797 
1798 MachO::nlist_64
getSymbol64TableEntry(DataRefImpl DRI) const1799 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1800   const char *P = reinterpret_cast<const char *>(DRI.p);
1801   return getStruct<MachO::nlist_64>(this, P);
1802 }
1803 
1804 MachO::linkedit_data_command
getLinkeditDataLoadCommand(const LoadCommandInfo & L) const1805 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
1806   return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
1807 }
1808 
1809 MachO::segment_command
getSegmentLoadCommand(const LoadCommandInfo & L) const1810 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1811   return getStruct<MachO::segment_command>(this, L.Ptr);
1812 }
1813 
1814 MachO::segment_command_64
getSegment64LoadCommand(const LoadCommandInfo & L) const1815 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1816   return getStruct<MachO::segment_command_64>(this, L.Ptr);
1817 }
1818 
1819 MachO::linker_options_command
getLinkerOptionsLoadCommand(const LoadCommandInfo & L) const1820 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1821   return getStruct<MachO::linker_options_command>(this, L.Ptr);
1822 }
1823 
1824 MachO::version_min_command
getVersionMinLoadCommand(const LoadCommandInfo & L) const1825 MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const {
1826   return getStruct<MachO::version_min_command>(this, L.Ptr);
1827 }
1828 
1829 MachO::dylib_command
getDylibIDLoadCommand(const LoadCommandInfo & L) const1830 MachOObjectFile::getDylibIDLoadCommand(const LoadCommandInfo &L) const {
1831   return getStruct<MachO::dylib_command>(this, L.Ptr);
1832 }
1833 
1834 
1835 MachO::any_relocation_info
getRelocation(DataRefImpl Rel) const1836 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1837   DataRefImpl Sec;
1838   Sec.d.a = Rel.d.a;
1839   uint32_t Offset;
1840   if (is64Bit()) {
1841     MachO::section_64 Sect = getSection64(Sec);
1842     Offset = Sect.reloff;
1843   } else {
1844     MachO::section Sect = getSection(Sec);
1845     Offset = Sect.reloff;
1846   }
1847 
1848   auto P = reinterpret_cast<const MachO::any_relocation_info *>(
1849       getPtr(this, Offset)) + Rel.d.b;
1850   return getStruct<MachO::any_relocation_info>(
1851       this, reinterpret_cast<const char *>(P));
1852 }
1853 
1854 MachO::data_in_code_entry
getDice(DataRefImpl Rel) const1855 MachOObjectFile::getDice(DataRefImpl Rel) const {
1856   const char *P = reinterpret_cast<const char *>(Rel.p);
1857   return getStruct<MachO::data_in_code_entry>(this, P);
1858 }
1859 
getHeader() const1860 MachO::mach_header MachOObjectFile::getHeader() const {
1861   return getStruct<MachO::mach_header>(this, getPtr(this, 0));
1862 }
1863 
getHeader64() const1864 MachO::mach_header_64 MachOObjectFile::getHeader64() const {
1865   return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
1866 }
1867 
getIndirectSymbolTableEntry(const MachO::dysymtab_command & DLC,unsigned Index) const1868 uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
1869                                              const MachO::dysymtab_command &DLC,
1870                                              unsigned Index) const {
1871   uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
1872   return getStruct<uint32_t>(this, getPtr(this, Offset));
1873 }
1874 
1875 MachO::data_in_code_entry
getDataInCodeTableEntry(uint32_t DataOffset,unsigned Index) const1876 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1877                                          unsigned Index) const {
1878   uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
1879   return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
1880 }
1881 
getSymtabLoadCommand() const1882 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
1883   return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
1884 }
1885 
getDysymtabLoadCommand() const1886 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
1887   return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
1888 }
1889 
1890 MachO::linkedit_data_command
getDataInCodeLoadCommand() const1891 MachOObjectFile::getDataInCodeLoadCommand() const {
1892   if (DataInCodeLoadCmd)
1893     return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
1894 
1895   // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1896   MachO::linkedit_data_command Cmd;
1897   Cmd.cmd = MachO::LC_DATA_IN_CODE;
1898   Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
1899   Cmd.dataoff = 0;
1900   Cmd.datasize = 0;
1901   return Cmd;
1902 }
1903 
getStringTableData() const1904 StringRef MachOObjectFile::getStringTableData() const {
1905   MachO::symtab_command S = getSymtabLoadCommand();
1906   return getData().substr(S.stroff, S.strsize);
1907 }
1908 
is64Bit() const1909 bool MachOObjectFile::is64Bit() const {
1910   return getType() == getMachOType(false, true) ||
1911          getType() == getMachOType(true, true);
1912 }
1913 
ReadULEB128s(uint64_t Index,SmallVectorImpl<uint64_t> & Out) const1914 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1915                                    SmallVectorImpl<uint64_t> &Out) const {
1916   DataExtractor extractor(ObjectFile::getData(), true, 0);
1917 
1918   uint32_t offset = Index;
1919   uint64_t data = 0;
1920   while (uint64_t delta = extractor.getULEB128(&offset)) {
1921     data += delta;
1922     Out.push_back(data);
1923   }
1924 }
1925 
getSectionPointer(DataRefImpl Rel) const1926 const char *MachOObjectFile::getSectionPointer(DataRefImpl Rel) const {
1927   return Sections[Rel.d.a];
1928 }
1929 
1930 ErrorOr<ObjectFile *>
createMachOObjectFile(std::unique_ptr<MemoryBuffer> & Buffer)1931 ObjectFile::createMachOObjectFile(std::unique_ptr<MemoryBuffer> &Buffer) {
1932   StringRef Magic = Buffer->getBuffer().slice(0, 4);
1933   std::error_code EC;
1934   std::unique_ptr<MachOObjectFile> Ret;
1935   if (Magic == "\xFE\xED\xFA\xCE")
1936     Ret.reset(new MachOObjectFile(std::move(Buffer), false, false, EC));
1937   else if (Magic == "\xCE\xFA\xED\xFE")
1938     Ret.reset(new MachOObjectFile(std::move(Buffer), true, false, EC));
1939   else if (Magic == "\xFE\xED\xFA\xCF")
1940     Ret.reset(new MachOObjectFile(std::move(Buffer), false, true, EC));
1941   else if (Magic == "\xCF\xFA\xED\xFE")
1942     Ret.reset(new MachOObjectFile(std::move(Buffer), true, true, EC));
1943   else
1944     return object_error::parse_failed;
1945 
1946   if (EC)
1947     return EC;
1948   return Ret.release();
1949 }
1950 
1951 } // end namespace object
1952 } // end namespace llvm
1953