xref: /llvm-project/llvm/lib/Object/COFFObjectFile.cpp (revision 89a7a5ea1f4b29aa3333e25e4e88ea772da78f8a) 
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->Type.ComplexType == 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::getSymbolSize(DataRefImpl Symb,
172                                          uint64_t &Result) const {
173   // FIXME: Return the correct size. This requires looking at all the symbols
174   //        in the same section as this symbol, and looking for either the next
175   //        symbol, or the end of the section.
176   const coff_symbol *symb = toSymb(Symb);
177   const coff_section *Section = NULL;
178   if (error_code ec = getSection(symb->SectionNumber, Section))
179     return ec;
180   char Type;
181   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
182     return ec;
183   if (Type == 'U' || Type == 'w')
184     Result = UnknownAddressOrSize;
185   else if (Section)
186     Result = Section->SizeOfRawData - symb->Value;
187   else
188     Result = 0;
189   return object_error::success;
190 }
191 
192 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
193                                                char &Result) const {
194   const coff_symbol *symb = toSymb(Symb);
195   StringRef name;
196   if (error_code ec = getSymbolName(Symb, name))
197     return ec;
198   char ret = StringSwitch<char>(name)
199     .StartsWith(".debug", 'N')
200     .StartsWith(".sxdata", 'N')
201     .Default('?');
202 
203   if (ret != '?') {
204     Result = ret;
205     return object_error::success;
206   }
207 
208   uint32_t Characteristics = 0;
209   if (symb->SectionNumber > 0) {
210     const coff_section *Section = NULL;
211     if (error_code ec = getSection(symb->SectionNumber, Section))
212       return ec;
213     Characteristics = Section->Characteristics;
214   }
215 
216   switch (symb->SectionNumber) {
217   case COFF::IMAGE_SYM_UNDEFINED:
218     // Check storage classes.
219     if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
220       Result = 'w';
221       return object_error::success; // Don't do ::toupper.
222     } else
223       ret = 'u';
224     break;
225   case COFF::IMAGE_SYM_ABSOLUTE:
226     ret = 'a';
227     break;
228   case COFF::IMAGE_SYM_DEBUG:
229     ret = 'n';
230     break;
231   default:
232     // Check section type.
233     if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
234       ret = 't';
235     else if (  Characteristics & COFF::IMAGE_SCN_MEM_READ
236             && ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
237       ret = 'r';
238     else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
239       ret = 'd';
240     else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
241       ret = 'b';
242     else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
243       ret = 'i';
244 
245     // Check for section symbol.
246     else if (  symb->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
247             && symb->Value == 0)
248        ret = 's';
249   }
250 
251   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
252     ret = ::toupper(ret);
253 
254   Result = ret;
255   return object_error::success;
256 }
257 
258 error_code COFFObjectFile::isSymbolInternal(DataRefImpl Symb,
259                                             bool &Result) const {
260   Result = false;
261   return object_error::success;
262 }
263 
264 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
265                                           SectionRef &Result) const {
266   const coff_section *sec = toSec(Sec);
267   sec += 1;
268   Sec.p = reinterpret_cast<uintptr_t>(sec);
269   Result = SectionRef(Sec, this);
270   return object_error::success;
271 }
272 
273 error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
274                                           StringRef &Result) const {
275   const coff_section *sec = toSec(Sec);
276   StringRef name;
277   if (sec->Name[7] == 0)
278     // Null terminated, let ::strlen figure out the length.
279     name = sec->Name;
280   else
281     // Not null terminated, use all 8 bytes.
282     name = StringRef(sec->Name, 8);
283 
284   // Check for string table entry. First byte is '/'.
285   if (name[0] == '/') {
286     uint32_t Offset;
287     name.substr(1).getAsInteger(10, Offset);
288     if (error_code ec = getString(Offset, name))
289       return ec;
290   }
291 
292   Result = name;
293   return object_error::success;
294 }
295 
296 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
297                                              uint64_t &Result) const {
298   const coff_section *sec = toSec(Sec);
299   Result = sec->VirtualAddress;
300   return object_error::success;
301 }
302 
303 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
304                                           uint64_t &Result) const {
305   const coff_section *sec = toSec(Sec);
306   Result = sec->SizeOfRawData;
307   return object_error::success;
308 }
309 
310 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
311                                               StringRef &Result) const {
312   const coff_section *sec = toSec(Sec);
313   // The only thing that we need to verify is that the contents is contained
314   // within the file bounds. We don't need to make sure it doesn't cover other
315   // data, as there's nothing that says that is not allowed.
316   uintptr_t con_start = uintptr_t(base()) + sec->PointerToRawData;
317   uintptr_t con_end = con_start + sec->SizeOfRawData;
318   if (con_end >= uintptr_t(Data->getBufferEnd()))
319     return object_error::parse_failed;
320   Result = StringRef(reinterpret_cast<const char*>(con_start),
321                      sec->SizeOfRawData);
322   return object_error::success;
323 }
324 
325 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
326                                                uint64_t &Res) const {
327   const coff_section *sec = toSec(Sec);
328   if (!sec)
329     return object_error::parse_failed;
330   Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
331   return object_error::success;
332 }
333 
334 error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
335                                          bool &Result) const {
336   const coff_section *sec = toSec(Sec);
337   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
338   return object_error::success;
339 }
340 
341 error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
342                                          bool &Result) const {
343   const coff_section *sec = toSec(Sec);
344   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
345   return object_error::success;
346 }
347 
348 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
349                                         bool &Result) const {
350   const coff_section *sec = toSec(Sec);
351   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
352   return object_error::success;
353 }
354 
355 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
356                                                  DataRefImpl Symb,
357                                                  bool &Result) const {
358   const coff_section *sec = toSec(Sec);
359   const coff_symbol *symb = toSymb(Symb);
360   const coff_section *symb_sec;
361   if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
362   if (symb_sec == sec)
363     Result = true;
364   else
365     Result = false;
366   return object_error::success;
367 }
368 
369 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
370   const coff_section *sec = toSec(Sec);
371   DataRefImpl ret;
372   std::memset(&ret, 0, sizeof(ret));
373   if (sec->NumberOfRelocations == 0)
374     ret.p = 0;
375   else
376     ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
377 
378   return relocation_iterator(RelocationRef(ret, this));
379 }
380 
381 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
382   const coff_section *sec = toSec(Sec);
383   DataRefImpl ret;
384   std::memset(&ret, 0, sizeof(ret));
385   if (sec->NumberOfRelocations == 0)
386     ret.p = 0;
387   else
388     ret.p = reinterpret_cast<uintptr_t>(
389               reinterpret_cast<const coff_relocation*>(
390                 base() + sec->PointerToRelocations)
391               + sec->NumberOfRelocations);
392 
393   return relocation_iterator(RelocationRef(ret, this));
394 }
395 
396 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
397   : ObjectFile(Binary::isCOFF, Object, ec) {
398   // Check that we at least have enough room for a header.
399   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
400 
401   // The actual starting location of the COFF header in the file. This can be
402   // non-zero in PE/COFF files.
403   uint64_t HeaderStart = 0;
404 
405   // Check if this is a PE/COFF file.
406   if (base()[0] == 0x4d && base()[1] == 0x5a) {
407     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
408     // PE signature to find 'normal' COFF header.
409     if (!checkSize(Data, ec, 0x3c + 8)) return;
410     HeaderStart += *reinterpret_cast<const ulittle32_t *>(base() + 0x3c);
411     // Check the PE header. ("PE\0\0")
412     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
413       ec = object_error::parse_failed;
414       return;
415     }
416     HeaderStart += 4; // Skip the PE Header.
417   }
418 
419   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
420   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
421     return;
422 
423   SectionTable =
424     reinterpret_cast<const coff_section *>( base()
425                                           + HeaderStart
426                                           + sizeof(coff_file_header)
427                                           + Header->SizeOfOptionalHeader);
428   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
429                  Header->NumberOfSections * sizeof(coff_section)))
430     return;
431 
432   SymbolTable =
433     reinterpret_cast<const coff_symbol *>(base()
434                                           + Header->PointerToSymbolTable);
435   if (!checkAddr(Data, ec, uintptr_t(SymbolTable),
436                  Header->NumberOfSymbols * sizeof(coff_symbol)))
437     return;
438 
439   // Find string table.
440   StringTable = reinterpret_cast<const char *>(base())
441                 + Header->PointerToSymbolTable
442                 + Header->NumberOfSymbols * sizeof(coff_symbol);
443   if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t)))
444     return;
445 
446   StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable);
447   if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize))
448     return;
449   // Check that the string table is null terminated if has any in it.
450   if (StringTableSize < 4
451       || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) {
452     ec = object_error::parse_failed;
453     return;
454   }
455 
456   ec = object_error::success;
457 }
458 
459 symbol_iterator COFFObjectFile::begin_symbols() const {
460   DataRefImpl ret;
461   std::memset(&ret, 0, sizeof(DataRefImpl));
462   ret.p = reinterpret_cast<intptr_t>(SymbolTable);
463   return symbol_iterator(SymbolRef(ret, this));
464 }
465 
466 symbol_iterator COFFObjectFile::end_symbols() const {
467   // The symbol table ends where the string table begins.
468   DataRefImpl ret;
469   std::memset(&ret, 0, sizeof(DataRefImpl));
470   ret.p = reinterpret_cast<intptr_t>(StringTable);
471   return symbol_iterator(SymbolRef(ret, this));
472 }
473 
474 section_iterator COFFObjectFile::begin_sections() const {
475   DataRefImpl ret;
476   std::memset(&ret, 0, sizeof(DataRefImpl));
477   ret.p = reinterpret_cast<intptr_t>(SectionTable);
478   return section_iterator(SectionRef(ret, this));
479 }
480 
481 section_iterator COFFObjectFile::end_sections() const {
482   DataRefImpl ret;
483   std::memset(&ret, 0, sizeof(DataRefImpl));
484   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
485   return section_iterator(SectionRef(ret, this));
486 }
487 
488 uint8_t COFFObjectFile::getBytesInAddress() const {
489   return getArch() == Triple::x86_64 ? 8 : 4;
490 }
491 
492 StringRef COFFObjectFile::getFileFormatName() const {
493   switch(Header->Machine) {
494   case COFF::IMAGE_FILE_MACHINE_I386:
495     return "COFF-i386";
496   case COFF::IMAGE_FILE_MACHINE_AMD64:
497     return "COFF-x86-64";
498   default:
499     return "COFF-<unknown arch>";
500   }
501 }
502 
503 unsigned COFFObjectFile::getArch() const {
504   switch(Header->Machine) {
505   case COFF::IMAGE_FILE_MACHINE_I386:
506     return Triple::x86;
507   case COFF::IMAGE_FILE_MACHINE_AMD64:
508     return Triple::x86_64;
509   default:
510     return Triple::UnknownArch;
511   }
512 }
513 
514 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
515   Res = Header;
516   return object_error::success;
517 }
518 
519 error_code COFFObjectFile::getSection(int32_t index,
520                                       const coff_section *&Result) const {
521   // Check for special index values.
522   if (index == COFF::IMAGE_SYM_UNDEFINED ||
523       index == COFF::IMAGE_SYM_ABSOLUTE ||
524       index == COFF::IMAGE_SYM_DEBUG)
525     Result = NULL;
526   else if (index > 0 && index <= Header->NumberOfSections)
527     // We already verified the section table data, so no need to check again.
528     Result = SectionTable + (index - 1);
529   else
530     return object_error::parse_failed;
531   return object_error::success;
532 }
533 
534 error_code COFFObjectFile::getString(uint32_t offset,
535                                      StringRef &Result) const {
536   if (StringTableSize <= 4)
537     // Tried to get a string from an empty string table.
538     return object_error::parse_failed;
539   if (offset >= StringTableSize)
540     return object_error::unexpected_eof;
541   Result = StringRef(StringTable + offset);
542   return object_error::success;
543 }
544 
545 error_code COFFObjectFile::getSymbol(uint32_t index,
546                                      const coff_symbol *&Result) const {
547   if (index >= 0 && index < Header->NumberOfSymbols)
548     Result = SymbolTable + index;
549   else
550     return object_error::parse_failed;
551   return object_error::success;
552 }
553 
554 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
555                                          StringRef &Res) const {
556   // Check for string table entry. First 4 bytes are 0.
557   if (symbol->Name.Offset.Zeroes == 0) {
558     uint32_t Offset = symbol->Name.Offset.Offset;
559     if (error_code ec = getString(Offset, Res))
560       return ec;
561     return object_error::success;
562   }
563 
564   if (symbol->Name.ShortName[7] == 0)
565     // Null terminated, let ::strlen figure out the length.
566     Res = StringRef(symbol->Name.ShortName);
567   else
568     // Not null terminated, use all 8 bytes.
569     Res = StringRef(symbol->Name.ShortName, 8);
570   return object_error::success;
571 }
572 
573 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
574   return reinterpret_cast<const coff_relocation*>(Rel.p);
575 }
576 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
577                                              RelocationRef &Res) const {
578   Rel.p = reinterpret_cast<uintptr_t>(
579             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
580   Res = RelocationRef(Rel, this);
581   return object_error::success;
582 }
583 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
584                                                 uint64_t &Res) const {
585   Res = toRel(Rel)->VirtualAddress;
586   return object_error::success;
587 }
588 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
589                                                SymbolRef &Res) const {
590   const coff_relocation* R = toRel(Rel);
591   DataRefImpl Symb;
592   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
593   Res = SymbolRef(Symb, this);
594   return object_error::success;
595 }
596 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
597                                              uint32_t &Res) const {
598   const coff_relocation* R = toRel(Rel);
599   Res = R->Type;
600   return object_error::success;
601 }
602 
603 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
604   case COFF::enum: res = #enum; break;
605 
606 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
607                                           SmallVectorImpl<char> &Result) const {
608   const coff_relocation *reloc = toRel(Rel);
609   StringRef res;
610   switch (Header->Machine) {
611   case COFF::IMAGE_FILE_MACHINE_AMD64:
612     switch (reloc->Type) {
613     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
614     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
615     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
616     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
617     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
618     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
619     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
620     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
621     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
622     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
623     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
624     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
625     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
626     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
627     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
628     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
629     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
630     default:
631       res = "Unknown";
632     }
633     break;
634   case COFF::IMAGE_FILE_MACHINE_I386:
635     switch (reloc->Type) {
636     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
637     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
638     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
639     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
640     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
641     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
642     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
643     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
644     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
645     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
646     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
647     default:
648       res = "Unknown";
649     }
650     break;
651   default:
652     res = "Unknown";
653   }
654   Result.append(res.begin(), res.end());
655   return object_error::success;
656 }
657 
658 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
659 
660 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
661                                                        int64_t &Res) const {
662   Res = 0;
663   return object_error::success;
664 }
665 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
666                                           SmallVectorImpl<char> &Result) const {
667   const coff_relocation *reloc = toRel(Rel);
668   const coff_symbol *symb = 0;
669   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
670   DataRefImpl sym;
671   ::memset(&sym, 0, sizeof(sym));
672   sym.p = reinterpret_cast<uintptr_t>(symb);
673   StringRef symname;
674   if (error_code ec = getSymbolName(sym, symname)) return ec;
675   Result.append(symname.begin(), symname.end());
676   return object_error::success;
677 }
678 
679 namespace llvm {
680 
681   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
682     error_code ec;
683     return new COFFObjectFile(Object, ec);
684   }
685 
686 } // end namespace llvm
687