xref: /llvm-project/llvm/lib/Object/COFFObjectFile.cpp (revision d0f5b0e194e0ac5f5cf6b4dea506f4c67dfa9ba2) 
1 //===- COFFObjectFile.cpp - COFF object file implementation -----*- 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 declares the COFFObjectFile class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/Object/COFF.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/ADT/StringSwitch.h"
17 #include "llvm/ADT/Triple.h"
18 
19 using namespace llvm;
20 using namespace object;
21 
22 namespace {
23 using support::ulittle8_t;
24 using support::ulittle16_t;
25 using support::ulittle32_t;
26 using support::little16_t;
27 }
28 
29 namespace {
30 // Returns false if size is greater than the buffer size. And sets ec.
31 bool checkSize(const MemoryBuffer *m, error_code &ec, uint64_t size) {
32   if (m->getBufferSize() < size) {
33     ec = object_error::unexpected_eof;
34     return false;
35   }
36   return true;
37 }
38 
39 // Returns false if any bytes in [addr, addr + size) fall outsize of m.
40 bool checkAddr(const MemoryBuffer *m,
41                error_code &ec,
42                uintptr_t addr,
43                uint64_t size) {
44   if (addr + size < addr ||
45       addr + size < size ||
46       addr + size > uintptr_t(m->getBufferEnd())) {
47     ec = object_error::unexpected_eof;
48     return false;
49   }
50   return true;
51 }
52 }
53 
54 const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Symb) const {
55   const coff_symbol *addr = reinterpret_cast<const coff_symbol*>(Symb.p);
56 
57 # ifndef NDEBUG
58   // Verify that the symbol points to a valid entry in the symbol table.
59   uintptr_t offset = uintptr_t(addr) - uintptr_t(base());
60   if (offset < Header->PointerToSymbolTable
61       || offset >= Header->PointerToSymbolTable
62          + (Header->NumberOfSymbols * sizeof(coff_symbol)))
63     report_fatal_error("Symbol was outside of symbol table.");
64 
65   assert((offset - Header->PointerToSymbolTable) % sizeof(coff_symbol)
66          == 0 && "Symbol did not point to the beginning of a symbol");
67 # endif
68 
69   return addr;
70 }
71 
72 const coff_section *COFFObjectFile::toSec(DataRefImpl Sec) const {
73   const coff_section *addr = reinterpret_cast<const coff_section*>(Sec.p);
74 
75 # ifndef NDEBUG
76   // Verify that the section points to a valid entry in the section table.
77   if (addr < SectionTable
78       || addr >= (SectionTable + Header->NumberOfSections))
79     report_fatal_error("Section was outside of section table.");
80 
81   uintptr_t offset = uintptr_t(addr) - uintptr_t(SectionTable);
82   assert(offset % sizeof(coff_section) == 0 &&
83          "Section did not point to the beginning of a section");
84 # endif
85 
86   return addr;
87 }
88 
89 error_code COFFObjectFile::getSymbolNext(DataRefImpl Symb,
90                                          SymbolRef &Result) const {
91   const coff_symbol *symb = toSymb(Symb);
92   symb += 1 + symb->NumberOfAuxSymbols;
93   Symb.p = reinterpret_cast<uintptr_t>(symb);
94   Result = SymbolRef(Symb, this);
95   return object_error::success;
96 }
97 
98  error_code COFFObjectFile::getSymbolName(DataRefImpl Symb,
99                                           StringRef &Result) const {
100   const coff_symbol *symb = toSymb(Symb);
101   return getSymbolName(symb, Result);
102 }
103 
104 error_code COFFObjectFile::getSymbolOffset(DataRefImpl Symb,
105                                             uint64_t &Result) const {
106   const coff_symbol *symb = toSymb(Symb);
107   const coff_section *Section = NULL;
108   if (error_code ec = getSection(symb->SectionNumber, Section))
109     return ec;
110   char Type;
111   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
112     return ec;
113   if (Type == 'U' || Type == 'w')
114     Result = UnknownAddressOrSize;
115   else if (Section)
116     Result = Section->VirtualAddress + symb->Value;
117   else
118     Result = symb->Value;
119   return object_error::success;
120 }
121 
122 error_code COFFObjectFile::getSymbolAddress(DataRefImpl Symb,
123                                             uint64_t &Result) const {
124   const coff_symbol *symb = toSymb(Symb);
125   const coff_section *Section = NULL;
126   if (error_code ec = getSection(symb->SectionNumber, Section))
127     return ec;
128   char Type;
129   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
130     return ec;
131   if (Type == 'U' || Type == 'w')
132     Result = UnknownAddressOrSize;
133   else if (Section)
134     Result = reinterpret_cast<uintptr_t>(base() +
135                                          Section->PointerToRawData +
136                                          symb->Value);
137   else
138     Result = reinterpret_cast<uintptr_t>(base() + symb->Value);
139   return object_error::success;
140 }
141 
142 error_code COFFObjectFile::getSymbolType(DataRefImpl Symb,
143                                          SymbolRef::Type &Result) const {
144   const coff_symbol *symb = toSymb(Symb);
145   Result = SymbolRef::ST_Other;
146   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
147       symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
148     Result = SymbolRef::ST_External;
149   } else {
150     if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
151       Result = SymbolRef::ST_Function;
152     } else {
153       char Type;
154       if (error_code ec = getSymbolNMTypeChar(Symb, Type))
155         return ec;
156       if (Type == 'r' || Type == 'R') {
157         Result = SymbolRef::ST_Data;
158       }
159     }
160   }
161   return object_error::success;
162 }
163 
164 error_code COFFObjectFile::isSymbolGlobal(DataRefImpl Symb,
165                                           bool &Result) const {
166   const coff_symbol *symb = toSymb(Symb);
167   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL);
168   return object_error::success;
169 }
170 
171 error_code COFFObjectFile::isSymbolWeak(DataRefImpl Symb,
172                                           bool &Result) const {
173   const coff_symbol *symb = toSymb(Symb);
174   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL);
175   return object_error::success;
176 }
177 
178 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
179                                          uint64_t &Result) const {
180   // FIXME: Return the correct size. This requires looking at all the symbols
181   //        in the same section as this symbol, and looking for either the next
182   //        symbol, or the end of the section.
183   const coff_symbol *symb = toSymb(Symb);
184   const coff_section *Section = NULL;
185   if (error_code ec = getSection(symb->SectionNumber, Section))
186     return ec;
187   char Type;
188   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
189     return ec;
190   if (Type == 'U' || Type == 'w')
191     Result = UnknownAddressOrSize;
192   else if (Section)
193     Result = Section->SizeOfRawData - symb->Value;
194   else
195     Result = 0;
196   return object_error::success;
197 }
198 
199 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
200                                                char &Result) const {
201   const coff_symbol *symb = toSymb(Symb);
202   StringRef name;
203   if (error_code ec = getSymbolName(Symb, name))
204     return ec;
205   char ret = StringSwitch<char>(name)
206     .StartsWith(".debug", 'N')
207     .StartsWith(".sxdata", 'N')
208     .Default('?');
209 
210   if (ret != '?') {
211     Result = ret;
212     return object_error::success;
213   }
214 
215   uint32_t Characteristics = 0;
216   if (symb->SectionNumber > 0) {
217     const coff_section *Section = NULL;
218     if (error_code ec = getSection(symb->SectionNumber, Section))
219       return ec;
220     Characteristics = Section->Characteristics;
221   }
222 
223   switch (symb->SectionNumber) {
224   case COFF::IMAGE_SYM_UNDEFINED:
225     // Check storage classes.
226     if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
227       Result = 'w';
228       return object_error::success; // Don't do ::toupper.
229     } else
230       ret = 'u';
231     break;
232   case COFF::IMAGE_SYM_ABSOLUTE:
233     ret = 'a';
234     break;
235   case COFF::IMAGE_SYM_DEBUG:
236     ret = 'n';
237     break;
238   default:
239     // Check section type.
240     if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
241       ret = 't';
242     else if (  Characteristics & COFF::IMAGE_SCN_MEM_READ
243             && ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
244       ret = 'r';
245     else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
246       ret = 'd';
247     else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
248       ret = 'b';
249     else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
250       ret = 'i';
251 
252     // Check for section symbol.
253     else if (  symb->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
254             && symb->Value == 0)
255        ret = 's';
256   }
257 
258   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
259     ret = ::toupper(ret);
260 
261   Result = ret;
262   return object_error::success;
263 }
264 
265 error_code COFFObjectFile::isSymbolInternal(DataRefImpl Symb,
266                                             bool &Result) const {
267   Result = false;
268   return object_error::success;
269 }
270 
271 error_code COFFObjectFile::isSymbolAbsolute(DataRefImpl Symb,
272                                             bool &Result) const {
273   const coff_symbol *symb = toSymb(Symb);
274   Result = symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE;
275   return object_error::success;
276 }
277 
278 error_code COFFObjectFile::getSymbolSection(DataRefImpl Symb,
279                                             section_iterator &Result) const {
280   const coff_symbol *symb = toSymb(Symb);
281   if (symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED)
282     Result = end_sections();
283   else {
284     const coff_section *sec;
285     if (error_code ec = getSection(symb->SectionNumber, sec)) return ec;
286     DataRefImpl Sec;
287     std::memset(&Sec, 0, sizeof(Sec));
288     Sec.p = reinterpret_cast<uintptr_t>(sec);
289     Result = section_iterator(SectionRef(Sec, this));
290   }
291   return object_error::success;
292 }
293 
294 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
295                                           SectionRef &Result) const {
296   const coff_section *sec = toSec(Sec);
297   sec += 1;
298   Sec.p = reinterpret_cast<uintptr_t>(sec);
299   Result = SectionRef(Sec, this);
300   return object_error::success;
301 }
302 
303 error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
304                                           StringRef &Result) const {
305   const coff_section *sec = toSec(Sec);
306   StringRef name;
307   if (sec->Name[7] == 0)
308     // Null terminated, let ::strlen figure out the length.
309     name = sec->Name;
310   else
311     // Not null terminated, use all 8 bytes.
312     name = StringRef(sec->Name, 8);
313 
314   // Check for string table entry. First byte is '/'.
315   if (name[0] == '/') {
316     uint32_t Offset;
317     name.substr(1).getAsInteger(10, Offset);
318     if (error_code ec = getString(Offset, name))
319       return ec;
320   }
321 
322   Result = name;
323   return object_error::success;
324 }
325 
326 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
327                                              uint64_t &Result) const {
328   const coff_section *sec = toSec(Sec);
329   Result = sec->VirtualAddress;
330   return object_error::success;
331 }
332 
333 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
334                                           uint64_t &Result) const {
335   const coff_section *sec = toSec(Sec);
336   Result = sec->SizeOfRawData;
337   return object_error::success;
338 }
339 
340 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
341                                               StringRef &Result) const {
342   const coff_section *sec = toSec(Sec);
343   // The only thing that we need to verify is that the contents is contained
344   // within the file bounds. We don't need to make sure it doesn't cover other
345   // data, as there's nothing that says that is not allowed.
346   uintptr_t con_start = uintptr_t(base()) + sec->PointerToRawData;
347   uintptr_t con_end = con_start + sec->SizeOfRawData;
348   if (con_end >= uintptr_t(Data->getBufferEnd()))
349     return object_error::parse_failed;
350   Result = StringRef(reinterpret_cast<const char*>(con_start),
351                      sec->SizeOfRawData);
352   return object_error::success;
353 }
354 
355 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
356                                                uint64_t &Res) const {
357   const coff_section *sec = toSec(Sec);
358   if (!sec)
359     return object_error::parse_failed;
360   Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
361   return object_error::success;
362 }
363 
364 error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
365                                          bool &Result) const {
366   const coff_section *sec = toSec(Sec);
367   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
368   return object_error::success;
369 }
370 
371 error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
372                                          bool &Result) const {
373   const coff_section *sec = toSec(Sec);
374   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
375   return object_error::success;
376 }
377 
378 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
379                                         bool &Result) const {
380   const coff_section *sec = toSec(Sec);
381   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
382   return object_error::success;
383 }
384 
385 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
386                                                  DataRefImpl Symb,
387                                                  bool &Result) const {
388   const coff_section *sec = toSec(Sec);
389   const coff_symbol *symb = toSymb(Symb);
390   const coff_section *symb_sec;
391   if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
392   if (symb_sec == sec)
393     Result = true;
394   else
395     Result = false;
396   return object_error::success;
397 }
398 
399 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
400   const coff_section *sec = toSec(Sec);
401   DataRefImpl ret;
402   std::memset(&ret, 0, sizeof(ret));
403   if (sec->NumberOfRelocations == 0)
404     ret.p = 0;
405   else
406     ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
407 
408   return relocation_iterator(RelocationRef(ret, this));
409 }
410 
411 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
412   const coff_section *sec = toSec(Sec);
413   DataRefImpl ret;
414   std::memset(&ret, 0, sizeof(ret));
415   if (sec->NumberOfRelocations == 0)
416     ret.p = 0;
417   else
418     ret.p = reinterpret_cast<uintptr_t>(
419               reinterpret_cast<const coff_relocation*>(
420                 base() + sec->PointerToRelocations)
421               + sec->NumberOfRelocations);
422 
423   return relocation_iterator(RelocationRef(ret, this));
424 }
425 
426 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
427   : ObjectFile(Binary::isCOFF, Object, ec) {
428   // Check that we at least have enough room for a header.
429   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
430 
431   // The actual starting location of the COFF header in the file. This can be
432   // non-zero in PE/COFF files.
433   uint64_t HeaderStart = 0;
434 
435   // Check if this is a PE/COFF file.
436   if (base()[0] == 0x4d && base()[1] == 0x5a) {
437     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
438     // PE signature to find 'normal' COFF header.
439     if (!checkSize(Data, ec, 0x3c + 8)) return;
440     HeaderStart += *reinterpret_cast<const ulittle32_t *>(base() + 0x3c);
441     // Check the PE header. ("PE\0\0")
442     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
443       ec = object_error::parse_failed;
444       return;
445     }
446     HeaderStart += 4; // Skip the PE Header.
447   }
448 
449   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
450   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
451     return;
452 
453   SectionTable =
454     reinterpret_cast<const coff_section *>( base()
455                                           + HeaderStart
456                                           + sizeof(coff_file_header)
457                                           + Header->SizeOfOptionalHeader);
458   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
459                  Header->NumberOfSections * sizeof(coff_section)))
460     return;
461 
462   SymbolTable =
463     reinterpret_cast<const coff_symbol *>(base()
464                                           + Header->PointerToSymbolTable);
465   if (!checkAddr(Data, ec, uintptr_t(SymbolTable),
466                  Header->NumberOfSymbols * sizeof(coff_symbol)))
467     return;
468 
469   // Find string table.
470   StringTable = reinterpret_cast<const char *>(base())
471                 + Header->PointerToSymbolTable
472                 + Header->NumberOfSymbols * sizeof(coff_symbol);
473   if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t)))
474     return;
475 
476   StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable);
477   if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize))
478     return;
479   // Check that the string table is null terminated if has any in it.
480   if (StringTableSize < 4
481       || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) {
482     ec = object_error::parse_failed;
483     return;
484   }
485 
486   ec = object_error::success;
487 }
488 
489 symbol_iterator COFFObjectFile::begin_symbols() const {
490   DataRefImpl ret;
491   std::memset(&ret, 0, sizeof(DataRefImpl));
492   ret.p = reinterpret_cast<intptr_t>(SymbolTable);
493   return symbol_iterator(SymbolRef(ret, this));
494 }
495 
496 symbol_iterator COFFObjectFile::end_symbols() const {
497   // The symbol table ends where the string table begins.
498   DataRefImpl ret;
499   std::memset(&ret, 0, sizeof(DataRefImpl));
500   ret.p = reinterpret_cast<intptr_t>(StringTable);
501   return symbol_iterator(SymbolRef(ret, this));
502 }
503 
504 section_iterator COFFObjectFile::begin_sections() const {
505   DataRefImpl ret;
506   std::memset(&ret, 0, sizeof(DataRefImpl));
507   ret.p = reinterpret_cast<intptr_t>(SectionTable);
508   return section_iterator(SectionRef(ret, this));
509 }
510 
511 section_iterator COFFObjectFile::end_sections() const {
512   DataRefImpl ret;
513   std::memset(&ret, 0, sizeof(DataRefImpl));
514   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
515   return section_iterator(SectionRef(ret, this));
516 }
517 
518 uint8_t COFFObjectFile::getBytesInAddress() const {
519   return getArch() == Triple::x86_64 ? 8 : 4;
520 }
521 
522 StringRef COFFObjectFile::getFileFormatName() const {
523   switch(Header->Machine) {
524   case COFF::IMAGE_FILE_MACHINE_I386:
525     return "COFF-i386";
526   case COFF::IMAGE_FILE_MACHINE_AMD64:
527     return "COFF-x86-64";
528   default:
529     return "COFF-<unknown arch>";
530   }
531 }
532 
533 unsigned COFFObjectFile::getArch() const {
534   switch(Header->Machine) {
535   case COFF::IMAGE_FILE_MACHINE_I386:
536     return Triple::x86;
537   case COFF::IMAGE_FILE_MACHINE_AMD64:
538     return Triple::x86_64;
539   default:
540     return Triple::UnknownArch;
541   }
542 }
543 
544 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
545   Res = Header;
546   return object_error::success;
547 }
548 
549 error_code COFFObjectFile::getSection(int32_t index,
550                                       const coff_section *&Result) const {
551   // Check for special index values.
552   if (index == COFF::IMAGE_SYM_UNDEFINED ||
553       index == COFF::IMAGE_SYM_ABSOLUTE ||
554       index == COFF::IMAGE_SYM_DEBUG)
555     Result = NULL;
556   else if (index > 0 && index <= Header->NumberOfSections)
557     // We already verified the section table data, so no need to check again.
558     Result = SectionTable + (index - 1);
559   else
560     return object_error::parse_failed;
561   return object_error::success;
562 }
563 
564 error_code COFFObjectFile::getString(uint32_t offset,
565                                      StringRef &Result) const {
566   if (StringTableSize <= 4)
567     // Tried to get a string from an empty string table.
568     return object_error::parse_failed;
569   if (offset >= StringTableSize)
570     return object_error::unexpected_eof;
571   Result = StringRef(StringTable + offset);
572   return object_error::success;
573 }
574 
575 error_code COFFObjectFile::getSymbol(uint32_t index,
576                                      const coff_symbol *&Result) const {
577   if (index < Header->NumberOfSymbols)
578     Result = SymbolTable + index;
579   else
580     return object_error::parse_failed;
581   return object_error::success;
582 }
583 
584 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
585                                          StringRef &Res) const {
586   // Check for string table entry. First 4 bytes are 0.
587   if (symbol->Name.Offset.Zeroes == 0) {
588     uint32_t Offset = symbol->Name.Offset.Offset;
589     if (error_code ec = getString(Offset, Res))
590       return ec;
591     return object_error::success;
592   }
593 
594   if (symbol->Name.ShortName[7] == 0)
595     // Null terminated, let ::strlen figure out the length.
596     Res = StringRef(symbol->Name.ShortName);
597   else
598     // Not null terminated, use all 8 bytes.
599     Res = StringRef(symbol->Name.ShortName, 8);
600   return object_error::success;
601 }
602 
603 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
604   return reinterpret_cast<const coff_relocation*>(Rel.p);
605 }
606 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
607                                              RelocationRef &Res) const {
608   Rel.p = reinterpret_cast<uintptr_t>(
609             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
610   Res = RelocationRef(Rel, this);
611   return object_error::success;
612 }
613 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
614                                                 uint64_t &Res) const {
615   Res = toRel(Rel)->VirtualAddress;
616   return object_error::success;
617 }
618 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
619                                                SymbolRef &Res) const {
620   const coff_relocation* R = toRel(Rel);
621   DataRefImpl Symb;
622   std::memset(&Symb, 0, sizeof(Symb));
623   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
624   Res = SymbolRef(Symb, this);
625   return object_error::success;
626 }
627 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
628                                              uint64_t &Res) const {
629   const coff_relocation* R = toRel(Rel);
630   Res = R->Type;
631   return object_error::success;
632 }
633 
634 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
635   case COFF::enum: res = #enum; break;
636 
637 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
638                                           SmallVectorImpl<char> &Result) const {
639   const coff_relocation *reloc = toRel(Rel);
640   StringRef res;
641   switch (Header->Machine) {
642   case COFF::IMAGE_FILE_MACHINE_AMD64:
643     switch (reloc->Type) {
644     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
645     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
646     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
647     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
648     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
649     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
650     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
651     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
652     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
653     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
654     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
655     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
656     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
657     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
658     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
659     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
660     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
661     default:
662       res = "Unknown";
663     }
664     break;
665   case COFF::IMAGE_FILE_MACHINE_I386:
666     switch (reloc->Type) {
667     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
668     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
669     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
670     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
671     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
672     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
673     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
674     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
675     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
676     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
677     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
678     default:
679       res = "Unknown";
680     }
681     break;
682   default:
683     res = "Unknown";
684   }
685   Result.append(res.begin(), res.end());
686   return object_error::success;
687 }
688 
689 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
690 
691 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
692                                                        int64_t &Res) const {
693   Res = 0;
694   return object_error::success;
695 }
696 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
697                                           SmallVectorImpl<char> &Result) const {
698   const coff_relocation *reloc = toRel(Rel);
699   const coff_symbol *symb = 0;
700   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
701   DataRefImpl sym;
702   ::memset(&sym, 0, sizeof(sym));
703   sym.p = reinterpret_cast<uintptr_t>(symb);
704   StringRef symname;
705   if (error_code ec = getSymbolName(sym, symname)) return ec;
706   Result.append(symname.begin(), symname.end());
707   return object_error::success;
708 }
709 
710 namespace llvm {
711 
712   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
713     error_code ec;
714     return new COFFObjectFile(Object, ec);
715   }
716 
717 } // end namespace llvm
718