1 //===- COFFObjectFile.cpp - COFF object file implementation -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the COFFObjectFile class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Object/COFF.h"
15 #include "llvm/ADT/ArrayRef.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "llvm/ADT/StringSwitch.h"
18 #include "llvm/ADT/Triple.h"
19 #include "llvm/Support/Debug.h"
20 #include "llvm/Support/raw_ostream.h"
24 using namespace object;
26 using support::ulittle8_t;
27 using support::ulittle16_t;
28 using support::ulittle32_t;
29 using support::little16_t;
31 // Returns false if size is greater than the buffer size. And sets ec.
32 static bool checkSize(const MemoryBuffer *M, error_code &EC, uint64_t Size) {
33 if (M->getBufferSize() < Size) {
34 EC = object_error::unexpected_eof;
40 // Sets Obj unless any bytes in [addr, addr + size) fall outsize of m.
41 // Returns unexpected_eof if error.
43 static error_code getObject(const T *&Obj, const MemoryBuffer *M,
44 const uint8_t *Ptr, const size_t Size = sizeof(T)) {
45 uintptr_t Addr = uintptr_t(Ptr);
46 if (Addr + Size < Addr ||
48 Addr + Size > uintptr_t(M->getBufferEnd())) {
49 return object_error::unexpected_eof;
51 Obj = reinterpret_cast<const T *>(Addr);
52 return object_error::success;
55 const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Ref) const {
56 const coff_symbol *Addr = reinterpret_cast<const coff_symbol*>(Ref.p);
59 // Verify that the symbol points to a valid entry in the symbol table.
60 uintptr_t Offset = uintptr_t(Addr) - uintptr_t(base());
61 if (Offset < COFFHeader->PointerToSymbolTable
62 || Offset >= COFFHeader->PointerToSymbolTable
63 + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
64 report_fatal_error("Symbol was outside of symbol table.");
66 assert((Offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol)
67 == 0 && "Symbol did not point to the beginning of a symbol");
73 const coff_section *COFFObjectFile::toSec(DataRefImpl Ref) const {
74 const coff_section *Addr = reinterpret_cast<const coff_section*>(Ref.p);
77 // Verify that the section points to a valid entry in the section table.
78 if (Addr < SectionTable
79 || Addr >= (SectionTable + COFFHeader->NumberOfSections))
80 report_fatal_error("Section was outside of section table.");
82 uintptr_t Offset = uintptr_t(Addr) - uintptr_t(SectionTable);
83 assert(Offset % sizeof(coff_section) == 0 &&
84 "Section did not point to the beginning of a section");
90 void COFFObjectFile::moveSymbolNext(DataRefImpl &Ref) const {
91 const coff_symbol *Symb = toSymb(Ref);
92 Symb += 1 + Symb->NumberOfAuxSymbols;
93 Ref.p = reinterpret_cast<uintptr_t>(Symb);
96 error_code COFFObjectFile::getSymbolName(DataRefImpl Ref,
97 StringRef &Result) const {
98 const coff_symbol *Symb = toSymb(Ref);
99 return getSymbolName(Symb, Result);
102 error_code COFFObjectFile::getSymbolFileOffset(DataRefImpl Ref,
103 uint64_t &Result) const {
104 const coff_symbol *Symb = toSymb(Ref);
105 const coff_section *Section = NULL;
106 if (error_code EC = getSection(Symb->SectionNumber, Section))
109 if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
110 Result = UnknownAddressOrSize;
112 Result = Section->PointerToRawData + Symb->Value;
114 Result = Symb->Value;
115 return object_error::success;
118 error_code COFFObjectFile::getSymbolAddress(DataRefImpl Ref,
119 uint64_t &Result) const {
120 const coff_symbol *Symb = toSymb(Ref);
121 const coff_section *Section = NULL;
122 if (error_code EC = getSection(Symb->SectionNumber, Section))
125 if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
126 Result = UnknownAddressOrSize;
128 Result = Section->VirtualAddress + Symb->Value;
130 Result = Symb->Value;
131 return object_error::success;
134 error_code COFFObjectFile::getSymbolType(DataRefImpl Ref,
135 SymbolRef::Type &Result) const {
136 const coff_symbol *Symb = toSymb(Ref);
137 Result = SymbolRef::ST_Other;
138 if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
139 Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
140 Result = SymbolRef::ST_Unknown;
141 } else if (Symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
142 Result = SymbolRef::ST_Function;
144 uint32_t Characteristics = 0;
145 if (Symb->SectionNumber > 0) {
146 const coff_section *Section = NULL;
147 if (error_code EC = getSection(Symb->SectionNumber, Section))
149 Characteristics = Section->Characteristics;
151 if (Characteristics & COFF::IMAGE_SCN_MEM_READ &&
152 ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
153 Result = SymbolRef::ST_Data;
155 return object_error::success;
158 uint32_t COFFObjectFile::getSymbolFlags(DataRefImpl Ref) const {
159 const coff_symbol *Symb = toSymb(Ref);
160 uint32_t Result = SymbolRef::SF_None;
162 // TODO: Correctly set SF_FormatSpecific, SF_Common
164 if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
165 if (Symb->Value == 0)
166 Result |= SymbolRef::SF_Undefined;
168 Result |= SymbolRef::SF_Common;
172 // TODO: This are certainly too restrictive.
173 if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
174 Result |= SymbolRef::SF_Global;
176 if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
177 Result |= SymbolRef::SF_Weak;
179 if (Symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE)
180 Result |= SymbolRef::SF_Absolute;
185 error_code COFFObjectFile::getSymbolSize(DataRefImpl Ref,
186 uint64_t &Result) const {
187 // FIXME: Return the correct size. This requires looking at all the symbols
188 // in the same section as this symbol, and looking for either the next
189 // symbol, or the end of the section.
190 const coff_symbol *Symb = toSymb(Ref);
191 const coff_section *Section = NULL;
192 if (error_code EC = getSection(Symb->SectionNumber, Section))
195 if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
196 Result = UnknownAddressOrSize;
198 Result = Section->SizeOfRawData - Symb->Value;
201 return object_error::success;
204 error_code COFFObjectFile::getSymbolSection(DataRefImpl Ref,
205 section_iterator &Result) const {
206 const coff_symbol *Symb = toSymb(Ref);
207 if (Symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED)
208 Result = section_end();
210 const coff_section *Sec = 0;
211 if (error_code EC = getSection(Symb->SectionNumber, Sec)) return EC;
213 Ref.p = reinterpret_cast<uintptr_t>(Sec);
214 Result = section_iterator(SectionRef(Ref, this));
216 return object_error::success;
219 error_code COFFObjectFile::getSymbolValue(DataRefImpl Ref,
220 uint64_t &Val) const {
221 report_fatal_error("getSymbolValue unimplemented in COFFObjectFile");
224 void COFFObjectFile::moveSectionNext(DataRefImpl &Ref) const {
225 const coff_section *Sec = toSec(Ref);
227 Ref.p = reinterpret_cast<uintptr_t>(Sec);
230 error_code COFFObjectFile::getSectionName(DataRefImpl Ref,
231 StringRef &Result) const {
232 const coff_section *Sec = toSec(Ref);
233 return getSectionName(Sec, Result);
236 error_code COFFObjectFile::getSectionAddress(DataRefImpl Ref,
237 uint64_t &Result) const {
238 const coff_section *Sec = toSec(Ref);
239 Result = Sec->VirtualAddress;
240 return object_error::success;
243 error_code COFFObjectFile::getSectionSize(DataRefImpl Ref,
244 uint64_t &Result) const {
245 const coff_section *Sec = toSec(Ref);
246 Result = Sec->SizeOfRawData;
247 return object_error::success;
250 error_code COFFObjectFile::getSectionContents(DataRefImpl Ref,
251 StringRef &Result) const {
252 const coff_section *Sec = toSec(Ref);
253 ArrayRef<uint8_t> Res;
254 error_code EC = getSectionContents(Sec, Res);
255 Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size());
259 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Ref,
260 uint64_t &Res) const {
261 const coff_section *Sec = toSec(Ref);
263 return object_error::parse_failed;
264 Res = uint64_t(1) << (((Sec->Characteristics & 0x00F00000) >> 20) - 1);
265 return object_error::success;
268 error_code COFFObjectFile::isSectionText(DataRefImpl Ref,
269 bool &Result) const {
270 const coff_section *Sec = toSec(Ref);
271 Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
272 return object_error::success;
275 error_code COFFObjectFile::isSectionData(DataRefImpl Ref,
276 bool &Result) const {
277 const coff_section *Sec = toSec(Ref);
278 Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
279 return object_error::success;
282 error_code COFFObjectFile::isSectionBSS(DataRefImpl Ref,
283 bool &Result) const {
284 const coff_section *Sec = toSec(Ref);
285 Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
286 return object_error::success;
289 error_code COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Ref,
290 bool &Result) const {
291 // FIXME: Unimplemented
293 return object_error::success;
296 error_code COFFObjectFile::isSectionVirtual(DataRefImpl Ref,
297 bool &Result) const {
298 const coff_section *Sec = toSec(Ref);
299 Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
300 return object_error::success;
303 error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Ref,
304 bool &Result) const {
305 // FIXME: Unimplemented.
307 return object_error::success;
310 error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Ref,
311 bool &Result) const {
312 // FIXME: Unimplemented.
314 return object_error::success;
317 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl SecRef,
319 bool &Result) const {
320 const coff_section *Sec = toSec(SecRef);
321 const coff_symbol *Symb = toSymb(SymbRef);
322 const coff_section *SymbSec = 0;
323 if (error_code EC = getSection(Symb->SectionNumber, SymbSec)) return EC;
328 return object_error::success;
331 relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Ref) const {
332 const coff_section *Sec = toSec(Ref);
334 if (Sec->NumberOfRelocations == 0)
337 Ret.p = reinterpret_cast<uintptr_t>(base() + Sec->PointerToRelocations);
339 return relocation_iterator(RelocationRef(Ret, this));
342 relocation_iterator COFFObjectFile::section_rel_end(DataRefImpl Ref) const {
343 const coff_section *Sec = toSec(Ref);
345 if (Sec->NumberOfRelocations == 0)
348 Ret.p = reinterpret_cast<uintptr_t>(
349 reinterpret_cast<const coff_relocation*>(
350 base() + Sec->PointerToRelocations)
351 + Sec->NumberOfRelocations);
353 return relocation_iterator(RelocationRef(Ret, this));
356 // Initialize the pointer to the symbol table.
357 error_code COFFObjectFile::initSymbolTablePtr() {
358 if (error_code EC = getObject(
359 SymbolTable, Data, base() + COFFHeader->PointerToSymbolTable,
360 COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
363 // Find string table. The first four byte of the string table contains the
364 // total size of the string table, including the size field itself. If the
365 // string table is empty, the value of the first four byte would be 4.
366 const uint8_t *StringTableAddr =
367 base() + COFFHeader->PointerToSymbolTable +
368 COFFHeader->NumberOfSymbols * sizeof(coff_symbol);
369 const ulittle32_t *StringTableSizePtr;
370 if (error_code EC = getObject(StringTableSizePtr, Data, StringTableAddr))
372 StringTableSize = *StringTableSizePtr;
374 getObject(StringTable, Data, StringTableAddr, StringTableSize))
377 // Check that the string table is null terminated if has any in it.
378 if (StringTableSize < 4 ||
379 (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0))
380 return object_error::parse_failed;
381 return object_error::success;
384 // Returns the file offset for the given VA.
385 error_code COFFObjectFile::getVaPtr(uint32_t Addr, uintptr_t &Res) const {
386 uint32_t ImageBase = PE32Header ? PE32Header->ImageBase : PE32PlusHeader->ImageBase;
387 return getRvaPtr(Addr - ImageBase, Res);
390 // Returns the file offset for the given RVA.
391 error_code COFFObjectFile::getRvaPtr(uint32_t Addr, uintptr_t &Res) const {
392 for (section_iterator I = section_begin(), E = section_end(); I != E;
394 const coff_section *Section = getCOFFSection(I);
395 uint32_t SectionStart = Section->VirtualAddress;
396 uint32_t SectionEnd = Section->VirtualAddress + Section->VirtualSize;
397 if (SectionStart <= Addr && Addr < SectionEnd) {
398 uint32_t Offset = Addr - SectionStart;
399 Res = uintptr_t(base()) + Section->PointerToRawData + Offset;
400 return object_error::success;
403 return object_error::parse_failed;
406 // Returns hint and name fields, assuming \p Rva is pointing to a Hint/Name
408 error_code COFFObjectFile::
409 getHintName(uint32_t Rva, uint16_t &Hint, StringRef &Name) const {
410 uintptr_t IntPtr = 0;
411 if (error_code EC = getRvaPtr(Rva, IntPtr))
413 const uint8_t *Ptr = reinterpret_cast<const uint8_t *>(IntPtr);
414 Hint = *reinterpret_cast<const ulittle16_t *>(Ptr);
415 Name = StringRef(reinterpret_cast<const char *>(Ptr + 2));
416 return object_error::success;
419 // Find the import table.
420 error_code COFFObjectFile::initImportTablePtr() {
421 // First, we get the RVA of the import table. If the file lacks a pointer to
422 // the import table, do nothing.
423 const data_directory *DataEntry;
424 if (getDataDirectory(COFF::IMPORT_TABLE, DataEntry))
425 return object_error::success;
427 // Do nothing if the pointer to import table is NULL.
428 if (DataEntry->RelativeVirtualAddress == 0)
429 return object_error::success;
431 uint32_t ImportTableRva = DataEntry->RelativeVirtualAddress;
432 NumberOfImportDirectory = DataEntry->Size /
433 sizeof(import_directory_table_entry);
435 // Find the section that contains the RVA. This is needed because the RVA is
436 // the import table's memory address which is different from its file offset.
437 uintptr_t IntPtr = 0;
438 if (error_code EC = getRvaPtr(ImportTableRva, IntPtr))
440 ImportDirectory = reinterpret_cast<
441 const import_directory_table_entry *>(IntPtr);
442 return object_error::success;
445 // Find the export table.
446 error_code COFFObjectFile::initExportTablePtr() {
447 // First, we get the RVA of the export table. If the file lacks a pointer to
448 // the export table, do nothing.
449 const data_directory *DataEntry;
450 if (getDataDirectory(COFF::EXPORT_TABLE, DataEntry))
451 return object_error::success;
453 // Do nothing if the pointer to export table is NULL.
454 if (DataEntry->RelativeVirtualAddress == 0)
455 return object_error::success;
457 uint32_t ExportTableRva = DataEntry->RelativeVirtualAddress;
458 uintptr_t IntPtr = 0;
459 if (error_code EC = getRvaPtr(ExportTableRva, IntPtr))
462 reinterpret_cast<const export_directory_table_entry *>(IntPtr);
463 return object_error::success;
466 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &EC,
468 : ObjectFile(Binary::ID_COFF, Object, BufferOwned), COFFHeader(0),
469 PE32Header(0), PE32PlusHeader(0), DataDirectory(0), SectionTable(0),
470 SymbolTable(0), StringTable(0), StringTableSize(0), ImportDirectory(0),
471 NumberOfImportDirectory(0), ExportDirectory(0) {
472 // Check that we at least have enough room for a header.
473 if (!checkSize(Data, EC, sizeof(coff_file_header))) return;
475 // The current location in the file where we are looking at.
478 // PE header is optional and is present only in executables. If it exists,
479 // it is placed right after COFF header.
480 bool HasPEHeader = false;
482 // Check if this is a PE/COFF file.
483 if (base()[0] == 0x4d && base()[1] == 0x5a) {
484 // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
485 // PE signature to find 'normal' COFF header.
486 if (!checkSize(Data, EC, 0x3c + 8)) return;
487 CurPtr = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
488 // Check the PE magic bytes. ("PE\0\0")
489 if (std::memcmp(base() + CurPtr, "PE\0\0", 4) != 0) {
490 EC = object_error::parse_failed;
493 CurPtr += 4; // Skip the PE magic bytes.
497 if ((EC = getObject(COFFHeader, Data, base() + CurPtr)))
499 CurPtr += sizeof(coff_file_header);
502 const pe32_header *Header;
503 if ((EC = getObject(Header, Data, base() + CurPtr)))
506 const uint8_t *DataDirAddr;
507 uint64_t DataDirSize;
508 if (Header->Magic == 0x10b) {
510 DataDirAddr = base() + CurPtr + sizeof(pe32_header);
511 DataDirSize = sizeof(data_directory) * PE32Header->NumberOfRvaAndSize;
512 } else if (Header->Magic == 0x20b) {
513 PE32PlusHeader = reinterpret_cast<const pe32plus_header *>(Header);
514 DataDirAddr = base() + CurPtr + sizeof(pe32plus_header);
515 DataDirSize = sizeof(data_directory) * PE32PlusHeader->NumberOfRvaAndSize;
517 // It's neither PE32 nor PE32+.
518 EC = object_error::parse_failed;
521 if ((EC = getObject(DataDirectory, Data, DataDirAddr, DataDirSize)))
523 CurPtr += COFFHeader->SizeOfOptionalHeader;
526 if (COFFHeader->isImportLibrary())
529 if ((EC = getObject(SectionTable, Data, base() + CurPtr,
530 COFFHeader->NumberOfSections * sizeof(coff_section))))
533 // Initialize the pointer to the symbol table.
534 if (COFFHeader->PointerToSymbolTable != 0)
535 if ((EC = initSymbolTablePtr()))
538 // Initialize the pointer to the beginning of the import table.
539 if ((EC = initImportTablePtr()))
542 // Initialize the pointer to the export table.
543 if ((EC = initExportTablePtr()))
546 EC = object_error::success;
549 symbol_iterator COFFObjectFile::symbol_begin() const {
551 Ret.p = reinterpret_cast<uintptr_t>(SymbolTable);
552 return symbol_iterator(SymbolRef(Ret, this));
555 symbol_iterator COFFObjectFile::symbol_end() const {
556 // The symbol table ends where the string table begins.
558 Ret.p = reinterpret_cast<uintptr_t>(StringTable);
559 return symbol_iterator(SymbolRef(Ret, this));
562 library_iterator COFFObjectFile::needed_library_begin() const {
564 report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
567 library_iterator COFFObjectFile::needed_library_end() const {
569 report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
572 StringRef COFFObjectFile::getLoadName() const {
573 // COFF does not have this field.
577 import_directory_iterator COFFObjectFile::import_directory_begin() const {
578 return import_directory_iterator(
579 ImportDirectoryEntryRef(ImportDirectory, 0, this));
582 import_directory_iterator COFFObjectFile::import_directory_end() const {
583 return import_directory_iterator(
584 ImportDirectoryEntryRef(ImportDirectory, NumberOfImportDirectory, this));
587 export_directory_iterator COFFObjectFile::export_directory_begin() const {
588 return export_directory_iterator(
589 ExportDirectoryEntryRef(ExportDirectory, 0, this));
592 export_directory_iterator COFFObjectFile::export_directory_end() const {
593 if (ExportDirectory == 0)
594 return export_directory_iterator(ExportDirectoryEntryRef(0, 0, this));
595 ExportDirectoryEntryRef Ref(ExportDirectory,
596 ExportDirectory->AddressTableEntries, this);
597 return export_directory_iterator(Ref);
600 section_iterator COFFObjectFile::section_begin() const {
602 Ret.p = reinterpret_cast<uintptr_t>(SectionTable);
603 return section_iterator(SectionRef(Ret, this));
606 section_iterator COFFObjectFile::section_end() const {
608 int NumSections = COFFHeader->isImportLibrary()
609 ? 0 : COFFHeader->NumberOfSections;
610 Ret.p = reinterpret_cast<uintptr_t>(SectionTable + NumSections);
611 return section_iterator(SectionRef(Ret, this));
614 uint8_t COFFObjectFile::getBytesInAddress() const {
615 return getArch() == Triple::x86_64 ? 8 : 4;
618 StringRef COFFObjectFile::getFileFormatName() const {
619 switch(COFFHeader->Machine) {
620 case COFF::IMAGE_FILE_MACHINE_I386:
622 case COFF::IMAGE_FILE_MACHINE_AMD64:
623 return "COFF-x86-64";
625 return "COFF-<unknown arch>";
629 unsigned COFFObjectFile::getArch() const {
630 switch(COFFHeader->Machine) {
631 case COFF::IMAGE_FILE_MACHINE_I386:
633 case COFF::IMAGE_FILE_MACHINE_AMD64:
634 return Triple::x86_64;
636 return Triple::UnknownArch;
640 // This method is kept here because lld uses this. As soon as we make
641 // lld to use getCOFFHeader, this method will be removed.
642 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
643 return getCOFFHeader(Res);
646 error_code COFFObjectFile::getCOFFHeader(const coff_file_header *&Res) const {
648 return object_error::success;
651 error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const {
653 return object_error::success;
657 COFFObjectFile::getPE32PlusHeader(const pe32plus_header *&Res) const {
658 Res = PE32PlusHeader;
659 return object_error::success;
662 error_code COFFObjectFile::getDataDirectory(uint32_t Index,
663 const data_directory *&Res) const {
664 // Error if if there's no data directory or the index is out of range.
666 return object_error::parse_failed;
667 assert(PE32Header || PE32PlusHeader);
668 uint32_t NumEnt = PE32Header ? PE32Header->NumberOfRvaAndSize
669 : PE32PlusHeader->NumberOfRvaAndSize;
671 return object_error::parse_failed;
672 Res = &DataDirectory[Index];
673 return object_error::success;
676 error_code COFFObjectFile::getSection(int32_t Index,
677 const coff_section *&Result) const {
678 // Check for special index values.
679 if (Index == COFF::IMAGE_SYM_UNDEFINED ||
680 Index == COFF::IMAGE_SYM_ABSOLUTE ||
681 Index == COFF::IMAGE_SYM_DEBUG)
683 else if (Index > 0 && Index <= COFFHeader->NumberOfSections)
684 // We already verified the section table data, so no need to check again.
685 Result = SectionTable + (Index - 1);
687 return object_error::parse_failed;
688 return object_error::success;
691 error_code COFFObjectFile::getString(uint32_t Offset,
692 StringRef &Result) const {
693 if (StringTableSize <= 4)
694 // Tried to get a string from an empty string table.
695 return object_error::parse_failed;
696 if (Offset >= StringTableSize)
697 return object_error::unexpected_eof;
698 Result = StringRef(StringTable + Offset);
699 return object_error::success;
702 error_code COFFObjectFile::getSymbol(uint32_t Index,
703 const coff_symbol *&Result) const {
704 if (Index < COFFHeader->NumberOfSymbols)
705 Result = SymbolTable + Index;
707 return object_error::parse_failed;
708 return object_error::success;
711 error_code COFFObjectFile::getSymbolName(const coff_symbol *Symbol,
712 StringRef &Res) const {
713 // Check for string table entry. First 4 bytes are 0.
714 if (Symbol->Name.Offset.Zeroes == 0) {
715 uint32_t Offset = Symbol->Name.Offset.Offset;
716 if (error_code EC = getString(Offset, Res))
718 return object_error::success;
721 if (Symbol->Name.ShortName[7] == 0)
722 // Null terminated, let ::strlen figure out the length.
723 Res = StringRef(Symbol->Name.ShortName);
725 // Not null terminated, use all 8 bytes.
726 Res = StringRef(Symbol->Name.ShortName, 8);
727 return object_error::success;
730 ArrayRef<uint8_t> COFFObjectFile::getSymbolAuxData(
731 const coff_symbol *Symbol) const {
732 const uint8_t *Aux = NULL;
734 if (Symbol->NumberOfAuxSymbols > 0) {
735 // AUX data comes immediately after the symbol in COFF
736 Aux = reinterpret_cast<const uint8_t *>(Symbol + 1);
738 // Verify that the Aux symbol points to a valid entry in the symbol table.
739 uintptr_t Offset = uintptr_t(Aux) - uintptr_t(base());
740 if (Offset < COFFHeader->PointerToSymbolTable
741 || Offset >= COFFHeader->PointerToSymbolTable
742 + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
743 report_fatal_error("Aux Symbol data was outside of symbol table.");
745 assert((Offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol)
746 == 0 && "Aux Symbol data did not point to the beginning of a symbol");
749 return ArrayRef<uint8_t>(Aux,
750 Symbol->NumberOfAuxSymbols * sizeof(coff_symbol));
753 error_code COFFObjectFile::getSectionName(const coff_section *Sec,
754 StringRef &Res) const {
756 if (Sec->Name[7] == 0)
757 // Null terminated, let ::strlen figure out the length.
760 // Not null terminated, use all 8 bytes.
761 Name = StringRef(Sec->Name, 8);
763 // Check for string table entry. First byte is '/'.
764 if (Name[0] == '/') {
766 if (Name.substr(1).getAsInteger(10, Offset))
767 return object_error::parse_failed;
768 if (error_code EC = getString(Offset, Name))
773 return object_error::success;
776 error_code COFFObjectFile::getSectionContents(const coff_section *Sec,
777 ArrayRef<uint8_t> &Res) const {
778 // The only thing that we need to verify is that the contents is contained
779 // within the file bounds. We don't need to make sure it doesn't cover other
780 // data, as there's nothing that says that is not allowed.
781 uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData;
782 uintptr_t ConEnd = ConStart + Sec->SizeOfRawData;
783 if (ConEnd > uintptr_t(Data->getBufferEnd()))
784 return object_error::parse_failed;
785 Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart),
787 return object_error::success;
790 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
791 return reinterpret_cast<const coff_relocation*>(Rel.p);
794 void COFFObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
795 Rel.p = reinterpret_cast<uintptr_t>(
796 reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
799 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
800 uint64_t &Res) const {
801 report_fatal_error("getRelocationAddress not implemented in COFFObjectFile");
804 error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
805 uint64_t &Res) const {
806 Res = toRel(Rel)->VirtualAddress;
807 return object_error::success;
810 symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
811 const coff_relocation* R = toRel(Rel);
813 Ref.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
814 return symbol_iterator(SymbolRef(Ref, this));
817 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
818 uint64_t &Res) const {
819 const coff_relocation* R = toRel(Rel);
821 return object_error::success;
824 const coff_section *COFFObjectFile::getCOFFSection(section_iterator &It) const {
825 return toSec(It->getRawDataRefImpl());
828 const coff_symbol *COFFObjectFile::getCOFFSymbol(symbol_iterator &It) const {
829 return toSymb(It->getRawDataRefImpl());
832 const coff_relocation *COFFObjectFile::getCOFFRelocation(
833 relocation_iterator &It) const {
834 return toRel(It->getRawDataRefImpl());
837 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
838 case COFF::enum: Res = #enum; break;
840 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
841 SmallVectorImpl<char> &Result) const {
842 const coff_relocation *Reloc = toRel(Rel);
844 switch (COFFHeader->Machine) {
845 case COFF::IMAGE_FILE_MACHINE_AMD64:
846 switch (Reloc->Type) {
847 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
848 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
849 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
850 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
851 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
852 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
853 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
854 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
855 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
856 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
857 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
858 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
859 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
860 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
861 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
862 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
863 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
868 case COFF::IMAGE_FILE_MACHINE_I386:
869 switch (Reloc->Type) {
870 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
871 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
872 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
873 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
874 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
875 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
876 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
877 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
878 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
879 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
880 LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
888 Result.append(Res.begin(), Res.end());
889 return object_error::success;
892 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
894 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
895 SmallVectorImpl<char> &Result) const {
896 const coff_relocation *Reloc = toRel(Rel);
897 const coff_symbol *Symb = 0;
898 if (error_code EC = getSymbol(Reloc->SymbolTableIndex, Symb)) return EC;
900 Sym.p = reinterpret_cast<uintptr_t>(Symb);
902 if (error_code EC = getSymbolName(Sym, SymName)) return EC;
903 Result.append(SymName.begin(), SymName.end());
904 return object_error::success;
907 error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData,
908 LibraryRef &Result) const {
909 report_fatal_error("getLibraryNext not implemented in COFFObjectFile");
912 error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData,
913 StringRef &Result) const {
914 report_fatal_error("getLibraryPath not implemented in COFFObjectFile");
917 bool ImportDirectoryEntryRef::
918 operator==(const ImportDirectoryEntryRef &Other) const {
919 return ImportTable == Other.ImportTable && Index == Other.Index;
922 void ImportDirectoryEntryRef::moveNext() {
926 error_code ImportDirectoryEntryRef::
927 getImportTableEntry(const import_directory_table_entry *&Result) const {
928 Result = ImportTable;
929 return object_error::success;
932 error_code ImportDirectoryEntryRef::getName(StringRef &Result) const {
933 uintptr_t IntPtr = 0;
934 if (error_code EC = OwningObject->getRvaPtr(ImportTable->NameRVA, IntPtr))
936 Result = StringRef(reinterpret_cast<const char *>(IntPtr));
937 return object_error::success;
940 error_code ImportDirectoryEntryRef::getImportLookupEntry(
941 const import_lookup_table_entry32 *&Result) const {
942 uintptr_t IntPtr = 0;
944 OwningObject->getRvaPtr(ImportTable->ImportLookupTableRVA, IntPtr))
946 Result = reinterpret_cast<const import_lookup_table_entry32 *>(IntPtr);
947 return object_error::success;
950 bool ExportDirectoryEntryRef::
951 operator==(const ExportDirectoryEntryRef &Other) const {
952 return ExportTable == Other.ExportTable && Index == Other.Index;
955 void ExportDirectoryEntryRef::moveNext() {
959 // Returns the name of the current export symbol. If the symbol is exported only
960 // by ordinal, the empty string is set as a result.
961 error_code ExportDirectoryEntryRef::getDllName(StringRef &Result) const {
962 uintptr_t IntPtr = 0;
963 if (error_code EC = OwningObject->getRvaPtr(ExportTable->NameRVA, IntPtr))
965 Result = StringRef(reinterpret_cast<const char *>(IntPtr));
966 return object_error::success;
969 // Returns the starting ordinal number.
970 error_code ExportDirectoryEntryRef::getOrdinalBase(uint32_t &Result) const {
971 Result = ExportTable->OrdinalBase;
972 return object_error::success;
975 // Returns the export ordinal of the current export symbol.
976 error_code ExportDirectoryEntryRef::getOrdinal(uint32_t &Result) const {
977 Result = ExportTable->OrdinalBase + Index;
978 return object_error::success;
981 // Returns the address of the current export symbol.
982 error_code ExportDirectoryEntryRef::getExportRVA(uint32_t &Result) const {
983 uintptr_t IntPtr = 0;
984 if (error_code EC = OwningObject->getRvaPtr(
985 ExportTable->ExportAddressTableRVA, IntPtr))
987 const export_address_table_entry *entry =
988 reinterpret_cast<const export_address_table_entry *>(IntPtr);
989 Result = entry[Index].ExportRVA;
990 return object_error::success;
993 // Returns the name of the current export symbol. If the symbol is exported only
994 // by ordinal, the empty string is set as a result.
995 error_code ExportDirectoryEntryRef::getSymbolName(StringRef &Result) const {
996 uintptr_t IntPtr = 0;
997 if (error_code EC = OwningObject->getRvaPtr(
998 ExportTable->OrdinalTableRVA, IntPtr))
1000 const ulittle16_t *Start = reinterpret_cast<const ulittle16_t *>(IntPtr);
1002 uint32_t NumEntries = ExportTable->NumberOfNamePointers;
1004 for (const ulittle16_t *I = Start, *E = Start + NumEntries;
1005 I < E; ++I, ++Offset) {
1008 if (error_code EC = OwningObject->getRvaPtr(
1009 ExportTable->NamePointerRVA, IntPtr))
1011 const ulittle32_t *NamePtr = reinterpret_cast<const ulittle32_t *>(IntPtr);
1012 if (error_code EC = OwningObject->getRvaPtr(NamePtr[Offset], IntPtr))
1014 Result = StringRef(reinterpret_cast<const char *>(IntPtr));
1015 return object_error::success;
1018 return object_error::success;
1021 ErrorOr<ObjectFile *> ObjectFile::createCOFFObjectFile(MemoryBuffer *Object,
1024 OwningPtr<COFFObjectFile> Ret(new COFFObjectFile(Object, EC, BufferOwned));