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 //===----------------------------------------------------------------------===//
15 #include "llvm/Object/MachO.h"
16 #include "llvm/ADT/Triple.h"
17 #include "llvm/Support/DataExtractor.h"
18 #include "llvm/Support/Format.h"
19 #include "llvm/Support/Host.h"
20 #include "llvm/Support/MemoryBuffer.h"
21 #include "llvm/Support/raw_ostream.h"
22 #include <cctype>
23 #include <cstring>
24 #include <limits>
26 using namespace llvm;
27 using namespace object;
29 namespace llvm {
30 namespace object {
32 struct nlist_base {
33 uint32_t n_strx;
34 uint8_t n_type;
35 uint8_t n_sect;
36 uint16_t n_desc;
37 };
39 struct section_base {
40 char sectname[16];
41 char segname[16];
42 };
44 template<typename T>
45 static void SwapValue(T &Value) {
46 Value = sys::SwapByteOrder(Value);
47 }
49 template<typename T>
50 static void SwapStruct(T &Value);
52 template<>
53 void SwapStruct(MachO::any_relocation_info &H) {
54 SwapValue(H.r_word0);
55 SwapValue(H.r_word1);
56 }
58 template<>
59 void SwapStruct(MachO::load_command &L) {
60 SwapValue(L.cmd);
61 SwapValue(L.cmdsize);
62 }
64 template<>
65 void SwapStruct(nlist_base &S) {
66 SwapValue(S.n_strx);
67 SwapValue(S.n_desc);
68 }
70 template<>
71 void SwapStruct(MachO::section &S) {
72 SwapValue(S.addr);
73 SwapValue(S.size);
74 SwapValue(S.offset);
75 SwapValue(S.align);
76 SwapValue(S.reloff);
77 SwapValue(S.nreloc);
78 SwapValue(S.flags);
79 SwapValue(S.reserved1);
80 SwapValue(S.reserved2);
81 }
83 template<>
84 void SwapStruct(MachO::section_64 &S) {
85 SwapValue(S.addr);
86 SwapValue(S.size);
87 SwapValue(S.offset);
88 SwapValue(S.align);
89 SwapValue(S.reloff);
90 SwapValue(S.nreloc);
91 SwapValue(S.flags);
92 SwapValue(S.reserved1);
93 SwapValue(S.reserved2);
94 SwapValue(S.reserved3);
95 }
97 template<>
98 void SwapStruct(MachO::nlist &S) {
99 SwapValue(S.n_strx);
100 SwapValue(S.n_desc);
101 SwapValue(S.n_value);
102 }
104 template<>
105 void SwapStruct(MachO::nlist_64 &S) {
106 SwapValue(S.n_strx);
107 SwapValue(S.n_desc);
108 SwapValue(S.n_value);
109 }
111 template<>
112 void SwapStruct(MachO::mach_header &H) {
113 SwapValue(H.magic);
114 SwapValue(H.cputype);
115 SwapValue(H.cpusubtype);
116 SwapValue(H.filetype);
117 SwapValue(H.ncmds);
118 SwapValue(H.sizeofcmds);
119 SwapValue(H.flags);
120 }
122 template<>
123 void SwapStruct(MachO::mach_header_64 &H) {
124 SwapValue(H.magic);
125 SwapValue(H.cputype);
126 SwapValue(H.cpusubtype);
127 SwapValue(H.filetype);
128 SwapValue(H.ncmds);
129 SwapValue(H.sizeofcmds);
130 SwapValue(H.flags);
131 SwapValue(H.reserved);
132 }
134 template<>
135 void SwapStruct(MachO::symtab_command &C) {
136 SwapValue(C.cmd);
137 SwapValue(C.cmdsize);
138 SwapValue(C.symoff);
139 SwapValue(C.nsyms);
140 SwapValue(C.stroff);
141 SwapValue(C.strsize);
142 }
144 template<>
145 void SwapStruct(MachO::dysymtab_command &C) {
146 SwapValue(C.cmd);
147 SwapValue(C.cmdsize);
148 SwapValue(C.ilocalsym);
149 SwapValue(C.nlocalsym);
150 SwapValue(C.iextdefsym);
151 SwapValue(C.nextdefsym);
152 SwapValue(C.iundefsym);
153 SwapValue(C.nundefsym);
154 SwapValue(C.tocoff);
155 SwapValue(C.ntoc);
156 SwapValue(C.modtaboff);
157 SwapValue(C.nmodtab);
158 SwapValue(C.extrefsymoff);
159 SwapValue(C.nextrefsyms);
160 SwapValue(C.indirectsymoff);
161 SwapValue(C.nindirectsyms);
162 SwapValue(C.extreloff);
163 SwapValue(C.nextrel);
164 SwapValue(C.locreloff);
165 SwapValue(C.nlocrel);
166 }
168 template<>
169 void SwapStruct(MachO::linkedit_data_command &C) {
170 SwapValue(C.cmd);
171 SwapValue(C.cmdsize);
172 SwapValue(C.dataoff);
173 SwapValue(C.datasize);
174 }
176 template<>
177 void SwapStruct(MachO::segment_command &C) {
178 SwapValue(C.cmd);
179 SwapValue(C.cmdsize);
180 SwapValue(C.vmaddr);
181 SwapValue(C.vmsize);
182 SwapValue(C.fileoff);
183 SwapValue(C.filesize);
184 SwapValue(C.maxprot);
185 SwapValue(C.initprot);
186 SwapValue(C.nsects);
187 SwapValue(C.flags);
188 }
190 template<>
191 void SwapStruct(MachO::segment_command_64 &C) {
192 SwapValue(C.cmd);
193 SwapValue(C.cmdsize);
194 SwapValue(C.vmaddr);
195 SwapValue(C.vmsize);
196 SwapValue(C.fileoff);
197 SwapValue(C.filesize);
198 SwapValue(C.maxprot);
199 SwapValue(C.initprot);
200 SwapValue(C.nsects);
201 SwapValue(C.flags);
202 }
204 template<>
205 void SwapStruct(uint32_t &C) {
206 SwapValue(C);
207 }
209 template<>
210 void SwapStruct(MachO::linker_options_command &C) {
211 SwapValue(C.cmd);
212 SwapValue(C.cmdsize);
213 SwapValue(C.count);
214 }
216 template<>
217 void SwapStruct(MachO::data_in_code_entry &C) {
218 SwapValue(C.offset);
219 SwapValue(C.length);
220 SwapValue(C.kind);
221 }
223 template<typename T>
224 T getStruct(const MachOObjectFile *O, const char *P) {
225 T Cmd;
226 memcpy(&Cmd, P, sizeof(T));
227 if (O->isLittleEndian() != sys::IsLittleEndianHost)
228 SwapStruct(Cmd);
229 return Cmd;
230 }
232 static uint32_t
233 getSegmentLoadCommandNumSections(const MachOObjectFile *O,
234 const MachOObjectFile::LoadCommandInfo &L) {
235 if (O->is64Bit()) {
236 MachO::segment_command_64 S = O->getSegment64LoadCommand(L);
237 return S.nsects;
238 }
239 MachO::segment_command S = O->getSegmentLoadCommand(L);
240 return S.nsects;
241 }
243 static const char *
244 getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
245 unsigned Sec) {
246 uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
248 bool Is64 = O->is64Bit();
249 unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
250 sizeof(MachO::segment_command);
251 unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
252 sizeof(MachO::section);
254 uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
255 return reinterpret_cast<const char*>(SectionAddr);
256 }
258 static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
259 return O->getData().substr(Offset, 1).data();
260 }
262 static nlist_base
263 getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
264 const char *P = reinterpret_cast<const char *>(DRI.p);
265 return getStruct<nlist_base>(O, P);
266 }
268 static StringRef parseSegmentOrSectionName(const char *P) {
269 if (P[15] == 0)
270 // Null terminated.
271 return P;
272 // Not null terminated, so this is a 16 char string.
273 return StringRef(P, 16);
274 }
276 // Helper to advance a section or symbol iterator multiple increments at a time.
277 template<class T>
278 static error_code advance(T &it, size_t Val) {
279 error_code ec;
280 while (Val--) {
281 it.increment(ec);
282 }
283 return ec;
284 }
286 template<class T>
287 static void advanceTo(T &it, size_t Val) {
288 if (error_code ec = advance(it, Val))
289 report_fatal_error(ec.message());
290 }
292 static unsigned getCPUType(const MachOObjectFile *O) {
293 return O->getHeader().cputype;
294 }
296 static void printRelocationTargetName(const MachOObjectFile *O,
297 const MachO::any_relocation_info &RE,
298 raw_string_ostream &fmt) {
299 bool IsScattered = O->isRelocationScattered(RE);
301 // Target of a scattered relocation is an address. In the interest of
302 // generating pretty output, scan through the symbol table looking for a
303 // symbol that aligns with that address. If we find one, print it.
304 // Otherwise, we just print the hex address of the target.
305 if (IsScattered) {
306 uint32_t Val = O->getPlainRelocationSymbolNum(RE);
308 error_code ec;
309 for (symbol_iterator SI = O->begin_symbols(), SE = O->end_symbols();
310 SI != SE; SI.increment(ec)) {
311 if (ec) report_fatal_error(ec.message());
313 uint64_t Addr;
314 StringRef Name;
316 if ((ec = SI->getAddress(Addr)))
317 report_fatal_error(ec.message());
318 if (Addr != Val) continue;
319 if ((ec = SI->getName(Name)))
320 report_fatal_error(ec.message());
321 fmt << Name;
322 return;
323 }
325 // If we couldn't find a symbol that this relocation refers to, try
326 // to find a section beginning instead.
327 for (section_iterator SI = O->begin_sections(), SE = O->end_sections();
328 SI != SE; SI.increment(ec)) {
329 if (ec) report_fatal_error(ec.message());
331 uint64_t Addr;
332 StringRef Name;
334 if ((ec = SI->getAddress(Addr)))
335 report_fatal_error(ec.message());
336 if (Addr != Val) continue;
337 if ((ec = SI->getName(Name)))
338 report_fatal_error(ec.message());
339 fmt << Name;
340 return;
341 }
343 fmt << format("0x%x", Val);
344 return;
345 }
347 StringRef S;
348 bool isExtern = O->getPlainRelocationExternal(RE);
349 uint64_t Val = O->getPlainRelocationSymbolNum(RE);
351 if (isExtern) {
352 symbol_iterator SI = O->begin_symbols();
353 advanceTo(SI, Val);
354 SI->getName(S);
355 } else {
356 section_iterator SI = O->begin_sections();
357 // Adjust for the fact that sections are 1-indexed.
358 advanceTo(SI, Val - 1);
359 SI->getName(S);
360 }
362 fmt << S;
363 }
365 static uint32_t
366 getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
367 return RE.r_word0;
368 }
370 static unsigned
371 getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
372 return RE.r_word0 & 0xffffff;
373 }
375 static bool getPlainRelocationPCRel(const MachOObjectFile *O,
376 const MachO::any_relocation_info &RE) {
377 if (O->isLittleEndian())
378 return (RE.r_word1 >> 24) & 1;
379 return (RE.r_word1 >> 7) & 1;
380 }
382 static bool
383 getScatteredRelocationPCRel(const MachOObjectFile *O,
384 const MachO::any_relocation_info &RE) {
385 return (RE.r_word0 >> 30) & 1;
386 }
388 static unsigned getPlainRelocationLength(const MachOObjectFile *O,
389 const MachO::any_relocation_info &RE) {
390 if (O->isLittleEndian())
391 return (RE.r_word1 >> 25) & 3;
392 return (RE.r_word1 >> 5) & 3;
393 }
395 static unsigned
396 getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
397 return (RE.r_word0 >> 28) & 3;
398 }
400 static unsigned getPlainRelocationType(const MachOObjectFile *O,
401 const MachO::any_relocation_info &RE) {
402 if (O->isLittleEndian())
403 return RE.r_word1 >> 28;
404 return RE.r_word1 & 0xf;
405 }
407 static unsigned
408 getScatteredRelocationType(const MachO::any_relocation_info &RE) {
409 return (RE.r_word0 >> 24) & 0xf;
410 }
412 static uint32_t getSectionFlags(const MachOObjectFile *O,
413 DataRefImpl Sec) {
414 if (O->is64Bit()) {
415 MachO::section_64 Sect = O->getSection64(Sec);
416 return Sect.flags;
417 }
418 MachO::section Sect = O->getSection(Sec);
419 return Sect.flags;
420 }
422 MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
423 bool IsLittleEndian, bool Is64bits,
424 error_code &ec)
425 : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
426 SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
427 uint32_t LoadCommandCount = this->getHeader().ncmds;
428 MachO::LoadCommandType SegmentLoadType = is64Bit() ?
429 MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
431 MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
432 for (unsigned I = 0; ; ++I) {
433 if (Load.C.cmd == MachO::LC_SYMTAB) {
434 assert(!SymtabLoadCmd && "Multiple symbol tables");
435 SymtabLoadCmd = Load.Ptr;
436 } else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
437 assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
438 DysymtabLoadCmd = Load.Ptr;
439 } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
440 assert(!DataInCodeLoadCmd && "Multiple data in code tables");
441 DataInCodeLoadCmd = Load.Ptr;
442 } else if (Load.C.cmd == SegmentLoadType) {
443 uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
444 for (unsigned J = 0; J < NumSections; ++J) {
445 const char *Sec = getSectionPtr(this, Load, J);
446 Sections.push_back(Sec);
447 }
448 }
450 if (I == LoadCommandCount - 1)
451 break;
452 else
453 Load = getNextLoadCommandInfo(Load);
454 }
455 }
457 error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
458 SymbolRef &Res) const {
459 unsigned SymbolTableEntrySize = is64Bit() ?
460 sizeof(MachO::nlist_64) :
461 sizeof(MachO::nlist);
462 Symb.p += SymbolTableEntrySize;
463 Res = SymbolRef(Symb, this);
464 return object_error::success;
465 }
467 error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
468 StringRef &Res) const {
469 StringRef StringTable = getStringTableData();
470 nlist_base Entry = getSymbolTableEntryBase(this, Symb);
471 const char *Start = &StringTable.data()[Entry.n_strx];
472 Res = StringRef(Start);
473 return object_error::success;
474 }
476 error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
477 uint64_t &Res) const {
478 if (is64Bit()) {
479 MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
480 Res = Entry.n_value;
481 } else {
482 MachO::nlist Entry = getSymbolTableEntry(Symb);
483 Res = Entry.n_value;
484 }
485 return object_error::success;
486 }
488 error_code
489 MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
490 uint64_t &Res) const {
491 nlist_base Entry = getSymbolTableEntryBase(this, Symb);
492 getSymbolAddress(Symb, Res);
493 if (Entry.n_sect) {
494 uint64_t Delta;
495 DataRefImpl SecRel;
496 SecRel.d.a = Entry.n_sect-1;
497 if (is64Bit()) {
498 MachO::section_64 Sec = getSection64(SecRel);
499 Delta = Sec.offset - Sec.addr;
500 } else {
501 MachO::section Sec = getSection(SecRel);
502 Delta = Sec.offset - Sec.addr;
503 }
505 Res += Delta;
506 }
508 return object_error::success;
509 }
511 error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
512 uint32_t &Result) const {
513 uint32_t flags;
514 this->getSymbolFlags(DRI, flags);
515 if (flags & SymbolRef::SF_Common) {
516 nlist_base Entry = getSymbolTableEntryBase(this, DRI);
517 Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
518 } else {
519 Result = 0;
520 }
521 return object_error::success;
522 }
524 error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
525 uint64_t &Result) const {
526 uint64_t BeginOffset;
527 uint64_t EndOffset = 0;
528 uint8_t SectionIndex;
530 nlist_base Entry = getSymbolTableEntryBase(this, DRI);
531 uint64_t Value;
532 getSymbolAddress(DRI, Value);
534 BeginOffset = Value;
536 SectionIndex = Entry.n_sect;
537 if (!SectionIndex) {
538 uint32_t flags = SymbolRef::SF_None;
539 this->getSymbolFlags(DRI, flags);
540 if (flags & SymbolRef::SF_Common)
541 Result = Value;
542 else
543 Result = UnknownAddressOrSize;
544 return object_error::success;
545 }
546 // Unfortunately symbols are unsorted so we need to touch all
547 // symbols from load command
548 error_code ec;
549 for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E;
550 I.increment(ec)) {
551 DataRefImpl DRI = I->getRawDataRefImpl();
552 Entry = getSymbolTableEntryBase(this, DRI);
553 getSymbolAddress(DRI, Value);
554 if (Entry.n_sect == SectionIndex && Value > BeginOffset)
555 if (!EndOffset || Value < EndOffset)
556 EndOffset = Value;
557 }
558 if (!EndOffset) {
559 uint64_t Size;
560 DataRefImpl Sec;
561 Sec.d.a = SectionIndex-1;
562 getSectionSize(Sec, Size);
563 getSectionAddress(Sec, EndOffset);
564 EndOffset += Size;
565 }
566 Result = EndOffset - BeginOffset;
567 return object_error::success;
568 }
570 error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
571 SymbolRef::Type &Res) const {
572 nlist_base Entry = getSymbolTableEntryBase(this, Symb);
573 uint8_t n_type = Entry.n_type;
575 Res = SymbolRef::ST_Other;
577 // If this is a STAB debugging symbol, we can do nothing more.
578 if (n_type & MachO::N_STAB) {
579 Res = SymbolRef::ST_Debug;
580 return object_error::success;
581 }
583 switch (n_type & MachO::N_TYPE) {
584 case MachO::N_UNDF :
585 Res = SymbolRef::ST_Unknown;
586 break;
587 case MachO::N_SECT :
588 Res = SymbolRef::ST_Function;
589 break;
590 }
591 return object_error::success;
592 }
594 error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
595 uint32_t &Result) const {
596 nlist_base Entry = getSymbolTableEntryBase(this, DRI);
598 uint8_t MachOType = Entry.n_type;
599 uint16_t MachOFlags = Entry.n_desc;
601 // TODO: Correctly set SF_ThreadLocal
602 Result = SymbolRef::SF_None;
604 if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
605 Result |= SymbolRef::SF_Undefined;
607 if (MachOType & MachO::N_STAB)
608 Result |= SymbolRef::SF_FormatSpecific;
610 if (MachOType & MachO::N_EXT) {
611 Result |= SymbolRef::SF_Global;
612 if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
613 uint64_t Value;
614 getSymbolAddress(DRI, Value);
615 if (Value)
616 Result |= SymbolRef::SF_Common;
617 }
618 }
620 if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
621 Result |= SymbolRef::SF_Weak;
623 if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
624 Result |= SymbolRef::SF_Absolute;
626 return object_error::success;
627 }
629 error_code
630 MachOObjectFile::getSymbolSection(DataRefImpl Symb,
631 section_iterator &Res) const {
632 nlist_base Entry = getSymbolTableEntryBase(this, Symb);
633 uint8_t index = Entry.n_sect;
635 if (index == 0) {
636 Res = end_sections();
637 } else {
638 DataRefImpl DRI;
639 DRI.d.a = index - 1;
640 Res = section_iterator(SectionRef(DRI, this));
641 }
643 return object_error::success;
644 }
646 error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
647 uint64_t &Val) const {
648 report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
649 }
651 error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
652 SectionRef &Res) const {
653 Sec.d.a++;
654 Res = SectionRef(Sec, this);
655 return object_error::success;
656 }
658 error_code
659 MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
660 ArrayRef<char> Raw = getSectionRawName(Sec);
661 Result = parseSegmentOrSectionName(Raw.data());
662 return object_error::success;
663 }
665 error_code
666 MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
667 if (is64Bit()) {
668 MachO::section_64 Sect = getSection64(Sec);
669 Res = Sect.addr;
670 } else {
671 MachO::section Sect = getSection(Sec);
672 Res = Sect.addr;
673 }
674 return object_error::success;
675 }
677 error_code
678 MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
679 if (is64Bit()) {
680 MachO::section_64 Sect = getSection64(Sec);
681 Res = Sect.size;
682 } else {
683 MachO::section Sect = getSection(Sec);
684 Res = Sect.size;
685 }
687 return object_error::success;
688 }
690 error_code
691 MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
692 uint32_t Offset;
693 uint64_t Size;
695 if (is64Bit()) {
696 MachO::section_64 Sect = getSection64(Sec);
697 Offset = Sect.offset;
698 Size = Sect.size;
699 } else {
700 MachO::section Sect = getSection(Sec);
701 Offset = Sect.offset;
702 Size = Sect.size;
703 }
705 Res = this->getData().substr(Offset, Size);
706 return object_error::success;
707 }
709 error_code
710 MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
711 uint32_t Align;
712 if (is64Bit()) {
713 MachO::section_64 Sect = getSection64(Sec);
714 Align = Sect.align;
715 } else {
716 MachO::section Sect = getSection(Sec);
717 Align = Sect.align;
718 }
720 Res = uint64_t(1) << Align;
721 return object_error::success;
722 }
724 error_code
725 MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
726 uint32_t Flags = getSectionFlags(this, Sec);
727 Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
728 return object_error::success;
729 }
731 error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
732 // FIXME: Unimplemented.
733 Result = false;
734 return object_error::success;
735 }
737 error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
738 // FIXME: Unimplemented.
739 Result = false;
740 return object_error::success;
741 }
743 error_code
744 MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
745 bool &Result) const {
746 // FIXME: Unimplemented.
747 Result = true;
748 return object_error::success;
749 }
751 error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
752 bool &Result) const {
753 // FIXME: Unimplemented.
754 Result = false;
755 return object_error::success;
756 }
758 error_code
759 MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
760 uint32_t Flags = getSectionFlags(this, Sec);
761 unsigned SectionType = Flags & MachO::SECTION_TYPE;
762 Res = SectionType == MachO::S_ZEROFILL ||
763 SectionType == MachO::S_GB_ZEROFILL;
764 return object_error::success;
765 }
767 error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
768 bool &Result) const {
769 // Consider using the code from isSectionText to look for __const sections.
770 // Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
771 // to use section attributes to distinguish code from data.
773 // FIXME: Unimplemented.
774 Result = false;
775 return object_error::success;
776 }
778 error_code
779 MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
780 bool &Result) const {
781 SymbolRef::Type ST;
782 this->getSymbolType(Symb, ST);
783 if (ST == SymbolRef::ST_Unknown) {
784 Result = false;
785 return object_error::success;
786 }
788 uint64_t SectBegin, SectEnd;
789 getSectionAddress(Sec, SectBegin);
790 getSectionSize(Sec, SectEnd);
791 SectEnd += SectBegin;
793 uint64_t SymAddr;
794 getSymbolAddress(Symb, SymAddr);
795 Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
797 return object_error::success;
798 }
800 relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
801 uint32_t Offset;
802 if (is64Bit()) {
803 MachO::section_64 Sect = getSection64(Sec);
804 Offset = Sect.reloff;
805 } else {
806 MachO::section Sect = getSection(Sec);
807 Offset = Sect.reloff;
808 }
810 DataRefImpl Ret;
811 Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
812 return relocation_iterator(RelocationRef(Ret, this));
813 }
815 relocation_iterator
816 MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
817 uint32_t Offset;
818 uint32_t Num;
819 if (is64Bit()) {
820 MachO::section_64 Sect = getSection64(Sec);
821 Offset = Sect.reloff;
822 Num = Sect.nreloc;
823 } else {
824 MachO::section Sect = getSection(Sec);
825 Offset = Sect.reloff;
826 Num = Sect.nreloc;
827 }
829 const MachO::any_relocation_info *P =
830 reinterpret_cast<const MachO::any_relocation_info *>(getPtr(this, Offset));
832 DataRefImpl Ret;
833 Ret.p = reinterpret_cast<uintptr_t>(P + Num);
834 return relocation_iterator(RelocationRef(Ret, this));
835 }
837 error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
838 RelocationRef &Res) const {
839 const MachO::any_relocation_info *P =
840 reinterpret_cast<const MachO::any_relocation_info *>(Rel.p);
841 Rel.p = reinterpret_cast<uintptr_t>(P + 1);
842 Res = RelocationRef(Rel, this);
843 return object_error::success;
844 }
846 error_code
847 MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
848 report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
849 }
851 error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
852 uint64_t &Res) const {
853 MachO::any_relocation_info RE = getRelocation(Rel);
854 Res = getAnyRelocationAddress(RE);
855 return object_error::success;
856 }
858 symbol_iterator
859 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
860 MachO::any_relocation_info RE = getRelocation(Rel);
861 uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
862 bool isExtern = getPlainRelocationExternal(RE);
863 if (!isExtern)
864 return end_symbols();
866 MachO::symtab_command S = getSymtabLoadCommand();
867 unsigned SymbolTableEntrySize = is64Bit() ?
868 sizeof(MachO::nlist_64) :
869 sizeof(MachO::nlist);
870 uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
871 DataRefImpl Sym;
872 Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
873 return symbol_iterator(SymbolRef(Sym, this));
874 }
876 error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
877 uint64_t &Res) const {
878 MachO::any_relocation_info RE = getRelocation(Rel);
879 Res = getAnyRelocationType(RE);
880 return object_error::success;
881 }
883 error_code
884 MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
885 SmallVectorImpl<char> &Result) const {
886 StringRef res;
887 uint64_t RType;
888 getRelocationType(Rel, RType);
890 unsigned Arch = this->getArch();
892 switch (Arch) {
893 case Triple::x86: {
894 static const char *const Table[] = {
895 "GENERIC_RELOC_VANILLA",
896 "GENERIC_RELOC_PAIR",
897 "GENERIC_RELOC_SECTDIFF",
898 "GENERIC_RELOC_PB_LA_PTR",
899 "GENERIC_RELOC_LOCAL_SECTDIFF",
900 "GENERIC_RELOC_TLV" };
902 if (RType > 5)
903 res = "Unknown";
904 else
905 res = Table[RType];
906 break;
907 }
908 case Triple::x86_64: {
909 static const char *const Table[] = {
910 "X86_64_RELOC_UNSIGNED",
911 "X86_64_RELOC_SIGNED",
912 "X86_64_RELOC_BRANCH",
913 "X86_64_RELOC_GOT_LOAD",
914 "X86_64_RELOC_GOT",
915 "X86_64_RELOC_SUBTRACTOR",
916 "X86_64_RELOC_SIGNED_1",
917 "X86_64_RELOC_SIGNED_2",
918 "X86_64_RELOC_SIGNED_4",
919 "X86_64_RELOC_TLV" };
921 if (RType > 9)
922 res = "Unknown";
923 else
924 res = Table[RType];
925 break;
926 }
927 case Triple::arm: {
928 static const char *const Table[] = {
929 "ARM_RELOC_VANILLA",
930 "ARM_RELOC_PAIR",
931 "ARM_RELOC_SECTDIFF",
932 "ARM_RELOC_LOCAL_SECTDIFF",
933 "ARM_RELOC_PB_LA_PTR",
934 "ARM_RELOC_BR24",
935 "ARM_THUMB_RELOC_BR22",
936 "ARM_THUMB_32BIT_BRANCH",
937 "ARM_RELOC_HALF",
938 "ARM_RELOC_HALF_SECTDIFF" };
940 if (RType > 9)
941 res = "Unknown";
942 else
943 res = Table[RType];
944 break;
945 }
946 case Triple::ppc: {
947 static const char *const Table[] = {
948 "PPC_RELOC_VANILLA",
949 "PPC_RELOC_PAIR",
950 "PPC_RELOC_BR14",
951 "PPC_RELOC_BR24",
952 "PPC_RELOC_HI16",
953 "PPC_RELOC_LO16",
954 "PPC_RELOC_HA16",
955 "PPC_RELOC_LO14",
956 "PPC_RELOC_SECTDIFF",
957 "PPC_RELOC_PB_LA_PTR",
958 "PPC_RELOC_HI16_SECTDIFF",
959 "PPC_RELOC_LO16_SECTDIFF",
960 "PPC_RELOC_HA16_SECTDIFF",
961 "PPC_RELOC_JBSR",
962 "PPC_RELOC_LO14_SECTDIFF",
963 "PPC_RELOC_LOCAL_SECTDIFF" };
965 if (RType > 15)
966 res = "Unknown";
967 else
968 res = Table[RType];
969 break;
970 }
971 case Triple::UnknownArch:
972 res = "Unknown";
973 break;
974 }
975 Result.append(res.begin(), res.end());
976 return object_error::success;
977 }
979 error_code
980 MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
981 SmallVectorImpl<char> &Result) const {
982 MachO::any_relocation_info RE = getRelocation(Rel);
984 unsigned Arch = this->getArch();
986 std::string fmtbuf;
987 raw_string_ostream fmt(fmtbuf);
988 unsigned Type = this->getAnyRelocationType(RE);
989 bool IsPCRel = this->getAnyRelocationPCRel(RE);
991 // Determine any addends that should be displayed with the relocation.
992 // These require decoding the relocation type, which is triple-specific.
994 // X86_64 has entirely custom relocation types.
995 if (Arch == Triple::x86_64) {
996 bool isPCRel = getAnyRelocationPCRel(RE);
998 switch (Type) {
999 case MachO::X86_64_RELOC_GOT_LOAD:
1000 case MachO::X86_64_RELOC_GOT: {
1001 printRelocationTargetName(this, RE, fmt);
1002 fmt << "@GOT";
1003 if (isPCRel) fmt << "PCREL";
1004 break;
1005 }
1006 case MachO::X86_64_RELOC_SUBTRACTOR: {
1007 DataRefImpl RelNext = Rel;
1008 RelNext.d.a++;
1009 MachO::any_relocation_info RENext = getRelocation(RelNext);
1011 // X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
1012 // X86_64_RELOC_UNSIGNED.
1013 // NOTE: Scattered relocations don't exist on x86_64.
1014 unsigned RType = getAnyRelocationType(RENext);
1015 if (RType != MachO::X86_64_RELOC_UNSIGNED)
1016 report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
1017 "X86_64_RELOC_SUBTRACTOR.");
1019 // The X86_64_RELOC_UNSIGNED contains the minuend symbol;
1020 // X86_64_RELOC_SUBTRACTOR contains the subtrahend.
1021 printRelocationTargetName(this, RENext, fmt);
1022 fmt << "-";
1023 printRelocationTargetName(this, RE, fmt);
1024 break;
1025 }
1026 case MachO::X86_64_RELOC_TLV:
1027 printRelocationTargetName(this, RE, fmt);
1028 fmt << "@TLV";
1029 if (isPCRel) fmt << "P";
1030 break;
1031 case MachO::X86_64_RELOC_SIGNED_1:
1032 printRelocationTargetName(this, RE, fmt);
1033 fmt << "-1";
1034 break;
1035 case MachO::X86_64_RELOC_SIGNED_2:
1036 printRelocationTargetName(this, RE, fmt);
1037 fmt << "-2";
1038 break;
1039 case MachO::X86_64_RELOC_SIGNED_4:
1040 printRelocationTargetName(this, RE, fmt);
1041 fmt << "-4";
1042 break;
1043 default:
1044 printRelocationTargetName(this, RE, fmt);
1045 break;
1046 }
1047 // X86 and ARM share some relocation types in common.
1048 } else if (Arch == Triple::x86 || Arch == Triple::arm ||
1049 Arch == Triple::ppc) {
1050 // Generic relocation types...
1051 switch (Type) {
1052 case MachO::GENERIC_RELOC_PAIR: // prints no info
1053 return object_error::success;
1054 case MachO::GENERIC_RELOC_SECTDIFF: {
1055 DataRefImpl RelNext = Rel;
1056 RelNext.d.a++;
1057 MachO::any_relocation_info RENext = getRelocation(RelNext);
1059 // X86 sect diff's must be followed by a relocation of type
1060 // GENERIC_RELOC_PAIR.
1061 unsigned RType = getAnyRelocationType(RENext);
1063 if (RType != MachO::GENERIC_RELOC_PAIR)
1064 report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1065 "GENERIC_RELOC_SECTDIFF.");
1067 printRelocationTargetName(this, RE, fmt);
1068 fmt << "-";
1069 printRelocationTargetName(this, RENext, fmt);
1070 break;
1071 }
1072 }
1074 if (Arch == Triple::x86 || Arch == Triple::ppc) {
1075 switch (Type) {
1076 case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
1077 DataRefImpl RelNext = Rel;
1078 RelNext.d.a++;
1079 MachO::any_relocation_info RENext = getRelocation(RelNext);
1081 // X86 sect diff's must be followed by a relocation of type
1082 // GENERIC_RELOC_PAIR.
1083 unsigned RType = getAnyRelocationType(RENext);
1084 if (RType != MachO::GENERIC_RELOC_PAIR)
1085 report_fatal_error("Expected GENERIC_RELOC_PAIR after "
1086 "GENERIC_RELOC_LOCAL_SECTDIFF.");
1088 printRelocationTargetName(this, RE, fmt);
1089 fmt << "-";
1090 printRelocationTargetName(this, RENext, fmt);
1091 break;
1092 }
1093 case MachO::GENERIC_RELOC_TLV: {
1094 printRelocationTargetName(this, RE, fmt);
1095 fmt << "@TLV";
1096 if (IsPCRel) fmt << "P";
1097 break;
1098 }
1099 default:
1100 printRelocationTargetName(this, RE, fmt);
1101 }
1102 } else { // ARM-specific relocations
1103 switch (Type) {
1104 case MachO::ARM_RELOC_HALF:
1105 case MachO::ARM_RELOC_HALF_SECTDIFF: {
1106 // Half relocations steal a bit from the length field to encode
1107 // whether this is an upper16 or a lower16 relocation.
1108 bool isUpper = getAnyRelocationLength(RE) >> 1;
1110 if (isUpper)
1111 fmt << ":upper16:(";
1112 else
1113 fmt << ":lower16:(";
1114 printRelocationTargetName(this, RE, fmt);
1116 DataRefImpl RelNext = Rel;
1117 RelNext.d.a++;
1118 MachO::any_relocation_info RENext = getRelocation(RelNext);
1120 // ARM half relocs must be followed by a relocation of type
1121 // ARM_RELOC_PAIR.
1122 unsigned RType = getAnyRelocationType(RENext);
1123 if (RType != MachO::ARM_RELOC_PAIR)
1124 report_fatal_error("Expected ARM_RELOC_PAIR after "
1125 "ARM_RELOC_HALF");
1127 // NOTE: The half of the target virtual address is stashed in the
1128 // address field of the secondary relocation, but we can't reverse
1129 // engineer the constant offset from it without decoding the movw/movt
1130 // instruction to find the other half in its immediate field.
1132 // ARM_RELOC_HALF_SECTDIFF encodes the second section in the
1133 // symbol/section pointer of the follow-on relocation.
1134 if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
1135 fmt << "-";
1136 printRelocationTargetName(this, RENext, fmt);
1137 }
1139 fmt << ")";
1140 break;
1141 }
1142 default: {
1143 printRelocationTargetName(this, RE, fmt);
1144 }
1145 }
1146 }
1147 } else
1148 printRelocationTargetName(this, RE, fmt);
1150 fmt.flush();
1151 Result.append(fmtbuf.begin(), fmtbuf.end());
1152 return object_error::success;
1153 }
1155 error_code
1156 MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
1157 unsigned Arch = getArch();
1158 uint64_t Type;
1159 getRelocationType(Rel, Type);
1161 Result = false;
1163 // On arches that use the generic relocations, GENERIC_RELOC_PAIR
1164 // is always hidden.
1165 if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
1166 if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
1167 } else if (Arch == Triple::x86_64) {
1168 // On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
1169 // an X86_64_RELOC_SUBTRACTOR.
1170 if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
1171 DataRefImpl RelPrev = Rel;
1172 RelPrev.d.a--;
1173 uint64_t PrevType;
1174 getRelocationType(RelPrev, PrevType);
1175 if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
1176 Result = true;
1177 }
1178 }
1180 return object_error::success;
1181 }
1183 error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
1184 LibraryRef &Res) const {
1185 report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1186 }
1188 error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
1189 StringRef &Res) const {
1190 report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1191 }
1193 symbol_iterator MachOObjectFile::begin_symbols() const {
1194 DataRefImpl DRI;
1195 if (!SymtabLoadCmd)
1196 return symbol_iterator(SymbolRef(DRI, this));
1198 MachO::symtab_command Symtab = getSymtabLoadCommand();
1199 DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
1200 return symbol_iterator(SymbolRef(DRI, this));
1201 }
1203 symbol_iterator MachOObjectFile::end_symbols() const {
1204 DataRefImpl DRI;
1205 if (!SymtabLoadCmd)
1206 return symbol_iterator(SymbolRef(DRI, this));
1208 MachO::symtab_command Symtab = getSymtabLoadCommand();
1209 unsigned SymbolTableEntrySize = is64Bit() ?
1210 sizeof(MachO::nlist_64) :
1211 sizeof(MachO::nlist);
1212 unsigned Offset = Symtab.symoff +
1213 Symtab.nsyms * SymbolTableEntrySize;
1214 DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1215 return symbol_iterator(SymbolRef(DRI, this));
1216 }
1218 symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
1219 // TODO: implement
1220 report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1221 }
1223 symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
1224 // TODO: implement
1225 report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
1226 }
1228 section_iterator MachOObjectFile::begin_sections() const {
1229 DataRefImpl DRI;
1230 return section_iterator(SectionRef(DRI, this));
1231 }
1233 section_iterator MachOObjectFile::end_sections() const {
1234 DataRefImpl DRI;
1235 DRI.d.a = Sections.size();
1236 return section_iterator(SectionRef(DRI, this));
1237 }
1239 library_iterator MachOObjectFile::begin_libraries_needed() const {
1240 // TODO: implement
1241 report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1242 }
1244 library_iterator MachOObjectFile::end_libraries_needed() const {
1245 // TODO: implement
1246 report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
1247 }
1249 uint8_t MachOObjectFile::getBytesInAddress() const {
1250 return is64Bit() ? 8 : 4;
1251 }
1253 StringRef MachOObjectFile::getFileFormatName() const {
1254 unsigned CPUType = getCPUType(this);
1255 if (!is64Bit()) {
1256 switch (CPUType) {
1257 case llvm::MachO::CPU_TYPE_I386:
1258 return "Mach-O 32-bit i386";
1259 case llvm::MachO::CPU_TYPE_ARM:
1260 return "Mach-O arm";
1261 case llvm::MachO::CPU_TYPE_POWERPC:
1262 return "Mach-O 32-bit ppc";
1263 default:
1264 assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
1265 "64-bit object file when we're not 64-bit?");
1266 return "Mach-O 32-bit unknown";
1267 }
1268 }
1270 // Make sure the cpu type has the correct mask.
1271 assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
1272 == llvm::MachO::CPU_ARCH_ABI64 &&
1273 "32-bit object file when we're 64-bit?");
1275 switch (CPUType) {
1276 case llvm::MachO::CPU_TYPE_X86_64:
1277 return "Mach-O 64-bit x86-64";
1278 case llvm::MachO::CPU_TYPE_POWERPC64:
1279 return "Mach-O 64-bit ppc64";
1280 default:
1281 return "Mach-O 64-bit unknown";
1282 }
1283 }
1285 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
1286 switch (CPUType) {
1287 case llvm::MachO::CPU_TYPE_I386:
1288 return Triple::x86;
1289 case llvm::MachO::CPU_TYPE_X86_64:
1290 return Triple::x86_64;
1291 case llvm::MachO::CPU_TYPE_ARM:
1292 return Triple::arm;
1293 case llvm::MachO::CPU_TYPE_POWERPC:
1294 return Triple::ppc;
1295 case llvm::MachO::CPU_TYPE_POWERPC64:
1296 return Triple::ppc64;
1297 default:
1298 return Triple::UnknownArch;
1299 }
1300 }
1302 unsigned MachOObjectFile::getArch() const {
1303 return getArch(getCPUType(this));
1304 }
1306 StringRef MachOObjectFile::getLoadName() const {
1307 // TODO: Implement
1308 report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
1309 }
1311 relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
1312 DataRefImpl DRI;
1313 DRI.d.a = Index;
1314 return section_rel_begin(DRI);
1315 }
1317 relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
1318 DataRefImpl DRI;
1319 DRI.d.a = Index;
1320 return section_rel_end(DRI);
1321 }
1323 dice_iterator MachOObjectFile::begin_dices() const {
1324 DataRefImpl DRI;
1325 if (!DataInCodeLoadCmd)
1326 return dice_iterator(DiceRef(DRI, this));
1328 MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1329 DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
1330 return dice_iterator(DiceRef(DRI, this));
1331 }
1333 dice_iterator MachOObjectFile::end_dices() const {
1334 DataRefImpl DRI;
1335 if (!DataInCodeLoadCmd)
1336 return dice_iterator(DiceRef(DRI, this));
1338 MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
1339 unsigned Offset = DicLC.dataoff + DicLC.datasize;
1340 DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
1341 return dice_iterator(DiceRef(DRI, this));
1342 }
1344 StringRef
1345 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
1346 ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
1347 return parseSegmentOrSectionName(Raw.data());
1348 }
1350 ArrayRef<char>
1351 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
1352 const section_base *Base =
1353 reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1354 return ArrayRef<char>(Base->sectname);
1355 }
1357 ArrayRef<char>
1358 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
1359 const section_base *Base =
1360 reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
1361 return ArrayRef<char>(Base->segname);
1362 }
1364 bool
1365 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
1366 const {
1367 if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
1368 return false;
1369 return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
1370 }
1372 unsigned MachOObjectFile::getPlainRelocationSymbolNum(
1373 const MachO::any_relocation_info &RE) const {
1374 if (isLittleEndian())
1375 return RE.r_word1 & 0xffffff;
1376 return RE.r_word1 >> 8;
1377 }
1379 bool MachOObjectFile::getPlainRelocationExternal(
1380 const MachO::any_relocation_info &RE) const {
1381 if (isLittleEndian())
1382 return (RE.r_word1 >> 27) & 1;
1383 return (RE.r_word1 >> 4) & 1;
1384 }
1386 bool MachOObjectFile::getScatteredRelocationScattered(
1387 const MachO::any_relocation_info &RE) const {
1388 return RE.r_word0 >> 31;
1389 }
1391 uint32_t MachOObjectFile::getScatteredRelocationValue(
1392 const MachO::any_relocation_info &RE) const {
1393 return RE.r_word1;
1394 }
1396 unsigned MachOObjectFile::getAnyRelocationAddress(
1397 const MachO::any_relocation_info &RE) const {
1398 if (isRelocationScattered(RE))
1399 return getScatteredRelocationAddress(RE);
1400 return getPlainRelocationAddress(RE);
1401 }
1403 unsigned MachOObjectFile::getAnyRelocationPCRel(
1404 const MachO::any_relocation_info &RE) const {
1405 if (isRelocationScattered(RE))
1406 return getScatteredRelocationPCRel(this, RE);
1407 return getPlainRelocationPCRel(this, RE);
1408 }
1410 unsigned MachOObjectFile::getAnyRelocationLength(
1411 const MachO::any_relocation_info &RE) const {
1412 if (isRelocationScattered(RE))
1413 return getScatteredRelocationLength(RE);
1414 return getPlainRelocationLength(this, RE);
1415 }
1417 unsigned
1418 MachOObjectFile::getAnyRelocationType(
1419 const MachO::any_relocation_info &RE) const {
1420 if (isRelocationScattered(RE))
1421 return getScatteredRelocationType(RE);
1422 return getPlainRelocationType(this, RE);
1423 }
1425 SectionRef
1426 MachOObjectFile::getRelocationSection(
1427 const MachO::any_relocation_info &RE) const {
1428 if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
1429 return *end_sections();
1430 unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
1431 DataRefImpl DRI;
1432 DRI.d.a = SecNum;
1433 return SectionRef(DRI, this);
1434 }
1436 MachOObjectFile::LoadCommandInfo
1437 MachOObjectFile::getFirstLoadCommandInfo() const {
1438 MachOObjectFile::LoadCommandInfo Load;
1440 unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
1441 sizeof(MachO::mach_header);
1442 Load.Ptr = getPtr(this, HeaderSize);
1443 Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
1444 return Load;
1445 }
1447 MachOObjectFile::LoadCommandInfo
1448 MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
1449 MachOObjectFile::LoadCommandInfo Next;
1450 Next.Ptr = L.Ptr + L.C.cmdsize;
1451 Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
1452 return Next;
1453 }
1455 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
1456 return getStruct<MachO::section>(this, Sections[DRI.d.a]);
1457 }
1459 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
1460 return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
1461 }
1463 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
1464 unsigned Index) const {
1465 const char *Sec = getSectionPtr(this, L, Index);
1466 return getStruct<MachO::section>(this, Sec);
1467 }
1469 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
1470 unsigned Index) const {
1471 const char *Sec = getSectionPtr(this, L, Index);
1472 return getStruct<MachO::section_64>(this, Sec);
1473 }
1475 MachO::nlist
1476 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
1477 const char *P = reinterpret_cast<const char *>(DRI.p);
1478 return getStruct<MachO::nlist>(this, P);
1479 }
1481 MachO::nlist_64
1482 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
1483 const char *P = reinterpret_cast<const char *>(DRI.p);
1484 return getStruct<MachO::nlist_64>(this, P);
1485 }
1487 MachO::linkedit_data_command
1488 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
1489 return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
1490 }
1492 MachO::segment_command
1493 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
1494 return getStruct<MachO::segment_command>(this, L.Ptr);
1495 }
1497 MachO::segment_command_64
1498 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
1499 return getStruct<MachO::segment_command_64>(this, L.Ptr);
1500 }
1502 MachO::linker_options_command
1503 MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
1504 return getStruct<MachO::linker_options_command>(this, L.Ptr);
1505 }
1507 MachO::any_relocation_info
1508 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
1509 const char *P = reinterpret_cast<const char *>(Rel.p);
1510 return getStruct<MachO::any_relocation_info>(this, P);
1511 }
1513 MachO::data_in_code_entry
1514 MachOObjectFile::getDice(DataRefImpl Rel) const {
1515 const char *P = reinterpret_cast<const char *>(Rel.p);
1516 return getStruct<MachO::data_in_code_entry>(this, P);
1517 }
1519 MachO::mach_header MachOObjectFile::getHeader() const {
1520 return getStruct<MachO::mach_header>(this, getPtr(this, 0));
1521 }
1523 MachO::mach_header_64 MachOObjectFile::getHeader64() const {
1524 return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
1525 }
1527 uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
1528 const MachO::dysymtab_command &DLC,
1529 unsigned Index) const {
1530 uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
1531 return getStruct<uint32_t>(this, getPtr(this, Offset));
1532 }
1534 MachO::data_in_code_entry
1535 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
1536 unsigned Index) const {
1537 uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
1538 return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
1539 }
1541 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
1542 return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
1543 }
1545 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
1546 return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
1547 }
1549 MachO::linkedit_data_command
1550 MachOObjectFile::getDataInCodeLoadCommand() const {
1551 if (DataInCodeLoadCmd)
1552 return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
1554 // If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
1555 MachO::linkedit_data_command Cmd;
1556 Cmd.cmd = MachO::LC_DATA_IN_CODE;
1557 Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
1558 Cmd.dataoff = 0;
1559 Cmd.datasize = 0;
1560 return Cmd;
1561 }
1563 StringRef MachOObjectFile::getStringTableData() const {
1564 MachO::symtab_command S = getSymtabLoadCommand();
1565 return getData().substr(S.stroff, S.strsize);
1566 }
1568 bool MachOObjectFile::is64Bit() const {
1569 return getType() == getMachOType(false, true) ||
1570 getType() == getMachOType(true, true);
1571 }
1573 void MachOObjectFile::ReadULEB128s(uint64_t Index,
1574 SmallVectorImpl<uint64_t> &Out) const {
1575 DataExtractor extractor(ObjectFile::getData(), true, 0);
1577 uint32_t offset = Index;
1578 uint64_t data = 0;
1579 while (uint64_t delta = extractor.getULEB128(&offset)) {
1580 data += delta;
1581 Out.push_back(data);
1582 }
1583 }
1585 ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
1586 StringRef Magic = Buffer->getBuffer().slice(0, 4);
1587 error_code ec;
1588 OwningPtr<ObjectFile> Ret;
1589 if (Magic == "\xFE\xED\xFA\xCE")
1590 Ret.reset(new MachOObjectFile(Buffer, false, false, ec));
1591 else if (Magic == "\xCE\xFA\xED\xFE")
1592 Ret.reset(new MachOObjectFile(Buffer, true, false, ec));
1593 else if (Magic == "\xFE\xED\xFA\xCF")
1594 Ret.reset(new MachOObjectFile(Buffer, false, true, ec));
1595 else if (Magic == "\xCF\xFA\xED\xFE")
1596 Ret.reset(new MachOObjectFile(Buffer, true, true, ec));
1597 else {
1598 delete Buffer;
1599 return NULL;
1600 }
1602 if (ec)
1603 return NULL;
1604 return Ret.take();
1605 }
1607 } // end namespace object
1608 } // end namespace llvm