xref: /llvm-project/llvm/lib/Object/COFFObjectFile.cpp (revision 8c4729fd4457e73d563f5306bac42f82353dcbd0) 
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::getSymbolFileOffset(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->PointerToRawData + 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 = Section->VirtualAddress + symb->Value;
135   else
136     Result = symb->Value;
137   return object_error::success;
138 }
139 
140 error_code COFFObjectFile::getSymbolType(DataRefImpl Symb,
141                                          SymbolRef::Type &Result) const {
142   const coff_symbol *symb = toSymb(Symb);
143   Result = SymbolRef::ST_Other;
144   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
145       symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
146     Result = SymbolRef::ST_External;
147   } else {
148     if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
149       Result = SymbolRef::ST_Function;
150     } else {
151       char Type;
152       if (error_code ec = getSymbolNMTypeChar(Symb, Type))
153         return ec;
154       if (Type == 'r' || Type == 'R') {
155         Result = SymbolRef::ST_Data;
156       }
157     }
158   }
159   return object_error::success;
160 }
161 
162 error_code COFFObjectFile::isSymbolGlobal(DataRefImpl Symb,
163                                           bool &Result) const {
164   const coff_symbol *symb = toSymb(Symb);
165   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL);
166   return object_error::success;
167 }
168 
169 error_code COFFObjectFile::isSymbolWeak(DataRefImpl Symb,
170                                           bool &Result) const {
171   const coff_symbol *symb = toSymb(Symb);
172   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL);
173   return object_error::success;
174 }
175 
176 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
177                                          uint64_t &Result) const {
178   // FIXME: Return the correct size. This requires looking at all the symbols
179   //        in the same section as this symbol, and looking for either the next
180   //        symbol, or the end of the section.
181   const coff_symbol *symb = toSymb(Symb);
182   const coff_section *Section = NULL;
183   if (error_code ec = getSection(symb->SectionNumber, Section))
184     return ec;
185   char Type;
186   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
187     return ec;
188   if (Type == 'U' || Type == 'w')
189     Result = UnknownAddressOrSize;
190   else if (Section)
191     Result = Section->SizeOfRawData - symb->Value;
192   else
193     Result = 0;
194   return object_error::success;
195 }
196 
197 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
198                                                char &Result) const {
199   const coff_symbol *symb = toSymb(Symb);
200   StringRef name;
201   if (error_code ec = getSymbolName(Symb, name))
202     return ec;
203   char ret = StringSwitch<char>(name)
204     .StartsWith(".debug", 'N')
205     .StartsWith(".sxdata", 'N')
206     .Default('?');
207 
208   if (ret != '?') {
209     Result = ret;
210     return object_error::success;
211   }
212 
213   uint32_t Characteristics = 0;
214   if (symb->SectionNumber > 0) {
215     const coff_section *Section = NULL;
216     if (error_code ec = getSection(symb->SectionNumber, Section))
217       return ec;
218     Characteristics = Section->Characteristics;
219   }
220 
221   switch (symb->SectionNumber) {
222   case COFF::IMAGE_SYM_UNDEFINED:
223     // Check storage classes.
224     if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
225       Result = 'w';
226       return object_error::success; // Don't do ::toupper.
227     } else if (symb->Value != 0) // Check for common symbols.
228       ret = 'c';
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 = 0;
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 = 0;
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   , Header(0)
429   , SectionTable(0)
430   , SymbolTable(0)
431   , StringTable(0)
432   , StringTableSize(0) {
433   // Check that we at least have enough room for a header.
434   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
435 
436   // The actual starting location of the COFF header in the file. This can be
437   // non-zero in PE/COFF files.
438   uint64_t HeaderStart = 0;
439 
440   // Check if this is a PE/COFF file.
441   if (base()[0] == 0x4d && base()[1] == 0x5a) {
442     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
443     // PE signature to find 'normal' COFF header.
444     if (!checkSize(Data, ec, 0x3c + 8)) return;
445     HeaderStart = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
446     // Check the PE header. ("PE\0\0")
447     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
448       ec = object_error::parse_failed;
449       return;
450     }
451     HeaderStart += 4; // Skip the PE Header.
452   }
453 
454   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
455   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
456     return;
457 
458   SectionTable =
459     reinterpret_cast<const coff_section *>( base()
460                                           + HeaderStart
461                                           + sizeof(coff_file_header)
462                                           + Header->SizeOfOptionalHeader);
463   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
464                  Header->NumberOfSections * sizeof(coff_section)))
465     return;
466 
467   if (Header->PointerToSymbolTable != 0) {
468     SymbolTable =
469       reinterpret_cast<const coff_symbol *>(base()
470                                             + Header->PointerToSymbolTable);
471     if (!checkAddr(Data, ec, uintptr_t(SymbolTable),
472                    Header->NumberOfSymbols * sizeof(coff_symbol)))
473       return;
474 
475     // Find string table.
476     StringTable = reinterpret_cast<const char *>(base())
477                   + Header->PointerToSymbolTable
478                   + Header->NumberOfSymbols * sizeof(coff_symbol);
479     if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t)))
480       return;
481 
482     StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable);
483     if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize))
484       return;
485     // Check that the string table is null terminated if has any in it.
486     if (StringTableSize < 4
487         || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) {
488       ec = object_error::parse_failed;
489       return;
490     }
491   }
492 
493   ec = object_error::success;
494 }
495 
496 symbol_iterator COFFObjectFile::begin_symbols() const {
497   DataRefImpl ret;
498   std::memset(&ret, 0, sizeof(DataRefImpl));
499   ret.p = reinterpret_cast<intptr_t>(SymbolTable);
500   return symbol_iterator(SymbolRef(ret, this));
501 }
502 
503 symbol_iterator COFFObjectFile::end_symbols() const {
504   // The symbol table ends where the string table begins.
505   DataRefImpl ret;
506   std::memset(&ret, 0, sizeof(DataRefImpl));
507   ret.p = reinterpret_cast<intptr_t>(StringTable);
508   return symbol_iterator(SymbolRef(ret, this));
509 }
510 
511 symbol_iterator COFFObjectFile::begin_dynamic_symbols() const {
512   // TODO: implement
513   report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
514 }
515 
516 symbol_iterator COFFObjectFile::end_dynamic_symbols() const {
517   // TODO: implement
518   report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
519 }
520 
521 section_iterator COFFObjectFile::begin_sections() const {
522   DataRefImpl ret;
523   std::memset(&ret, 0, sizeof(DataRefImpl));
524   ret.p = reinterpret_cast<intptr_t>(SectionTable);
525   return section_iterator(SectionRef(ret, this));
526 }
527 
528 section_iterator COFFObjectFile::end_sections() const {
529   DataRefImpl ret;
530   std::memset(&ret, 0, sizeof(DataRefImpl));
531   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
532   return section_iterator(SectionRef(ret, this));
533 }
534 
535 uint8_t COFFObjectFile::getBytesInAddress() const {
536   return getArch() == Triple::x86_64 ? 8 : 4;
537 }
538 
539 StringRef COFFObjectFile::getFileFormatName() const {
540   switch(Header->Machine) {
541   case COFF::IMAGE_FILE_MACHINE_I386:
542     return "COFF-i386";
543   case COFF::IMAGE_FILE_MACHINE_AMD64:
544     return "COFF-x86-64";
545   default:
546     return "COFF-<unknown arch>";
547   }
548 }
549 
550 unsigned COFFObjectFile::getArch() const {
551   switch(Header->Machine) {
552   case COFF::IMAGE_FILE_MACHINE_I386:
553     return Triple::x86;
554   case COFF::IMAGE_FILE_MACHINE_AMD64:
555     return Triple::x86_64;
556   default:
557     return Triple::UnknownArch;
558   }
559 }
560 
561 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
562   Res = Header;
563   return object_error::success;
564 }
565 
566 error_code COFFObjectFile::getSection(int32_t index,
567                                       const coff_section *&Result) const {
568   // Check for special index values.
569   if (index == COFF::IMAGE_SYM_UNDEFINED ||
570       index == COFF::IMAGE_SYM_ABSOLUTE ||
571       index == COFF::IMAGE_SYM_DEBUG)
572     Result = NULL;
573   else if (index > 0 && index <= Header->NumberOfSections)
574     // We already verified the section table data, so no need to check again.
575     Result = SectionTable + (index - 1);
576   else
577     return object_error::parse_failed;
578   return object_error::success;
579 }
580 
581 error_code COFFObjectFile::getString(uint32_t offset,
582                                      StringRef &Result) const {
583   if (StringTableSize <= 4)
584     // Tried to get a string from an empty string table.
585     return object_error::parse_failed;
586   if (offset >= StringTableSize)
587     return object_error::unexpected_eof;
588   Result = StringRef(StringTable + offset);
589   return object_error::success;
590 }
591 
592 error_code COFFObjectFile::getSymbol(uint32_t index,
593                                      const coff_symbol *&Result) const {
594   if (index < Header->NumberOfSymbols)
595     Result = SymbolTable + index;
596   else
597     return object_error::parse_failed;
598   return object_error::success;
599 }
600 
601 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
602                                          StringRef &Res) const {
603   // Check for string table entry. First 4 bytes are 0.
604   if (symbol->Name.Offset.Zeroes == 0) {
605     uint32_t Offset = symbol->Name.Offset.Offset;
606     if (error_code ec = getString(Offset, Res))
607       return ec;
608     return object_error::success;
609   }
610 
611   if (symbol->Name.ShortName[7] == 0)
612     // Null terminated, let ::strlen figure out the length.
613     Res = StringRef(symbol->Name.ShortName);
614   else
615     // Not null terminated, use all 8 bytes.
616     Res = StringRef(symbol->Name.ShortName, 8);
617   return object_error::success;
618 }
619 
620 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
621   return reinterpret_cast<const coff_relocation*>(Rel.p);
622 }
623 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
624                                              RelocationRef &Res) const {
625   Rel.p = reinterpret_cast<uintptr_t>(
626             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
627   Res = RelocationRef(Rel, this);
628   return object_error::success;
629 }
630 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
631                                                 uint64_t &Res) const {
632   Res = toRel(Rel)->VirtualAddress;
633   return object_error::success;
634 }
635 error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
636                                                uint64_t &Res) const {
637   Res = toRel(Rel)->VirtualAddress;
638   return object_error::success;
639 }
640 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
641                                                SymbolRef &Res) const {
642   const coff_relocation* R = toRel(Rel);
643   DataRefImpl Symb;
644   std::memset(&Symb, 0, sizeof(Symb));
645   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
646   Res = SymbolRef(Symb, this);
647   return object_error::success;
648 }
649 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
650                                              uint64_t &Res) const {
651   const coff_relocation* R = toRel(Rel);
652   Res = R->Type;
653   return object_error::success;
654 }
655 
656 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
657   case COFF::enum: res = #enum; break;
658 
659 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
660                                           SmallVectorImpl<char> &Result) const {
661   const coff_relocation *reloc = toRel(Rel);
662   StringRef res;
663   switch (Header->Machine) {
664   case COFF::IMAGE_FILE_MACHINE_AMD64:
665     switch (reloc->Type) {
666     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
667     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
668     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
669     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
670     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
671     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
672     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
673     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
674     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
675     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
676     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
677     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
678     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
679     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
680     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
681     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
682     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
683     default:
684       res = "Unknown";
685     }
686     break;
687   case COFF::IMAGE_FILE_MACHINE_I386:
688     switch (reloc->Type) {
689     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
690     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
691     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
692     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
693     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
694     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
695     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
696     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
697     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
698     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
699     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
700     default:
701       res = "Unknown";
702     }
703     break;
704   default:
705     res = "Unknown";
706   }
707   Result.append(res.begin(), res.end());
708   return object_error::success;
709 }
710 
711 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
712 
713 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
714                                                        int64_t &Res) const {
715   Res = 0;
716   return object_error::success;
717 }
718 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
719                                           SmallVectorImpl<char> &Result) const {
720   const coff_relocation *reloc = toRel(Rel);
721   const coff_symbol *symb = 0;
722   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
723   DataRefImpl sym;
724   ::memset(&sym, 0, sizeof(sym));
725   sym.p = reinterpret_cast<uintptr_t>(symb);
726   StringRef symname;
727   if (error_code ec = getSymbolName(sym, symname)) return ec;
728   Result.append(symname.begin(), symname.end());
729   return object_error::success;
730 }
731 
732 namespace llvm {
733 
734   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
735     error_code ec;
736     return new COFFObjectFile(Object, ec);
737   }
738 
739 } // end namespace llvm
740