diff options
Diffstat (limited to 'lib/Object/COFFObjectFile.cpp')
| -rw-r--r-- | lib/Object/COFFObjectFile.cpp | 1007 |
1 files changed, 701 insertions, 306 deletions
diff --git a/lib/Object/COFFObjectFile.cpp b/lib/Object/COFFObjectFile.cpp index 46ef87d..d5ff7d6 100644 --- a/lib/Object/COFFObjectFile.cpp +++ b/lib/Object/COFFObjectFile.cpp @@ -25,14 +25,13 @@ using namespace llvm; using namespace object; -using support::ulittle8_t; using support::ulittle16_t; using support::ulittle32_t; +using support::ulittle64_t; using support::little16_t; // Returns false if size is greater than the buffer size. And sets ec. -static bool checkSize(const MemoryBuffer &M, std::error_code &EC, - uint64_t Size) { +static bool checkSize(MemoryBufferRef M, std::error_code &EC, uint64_t Size) { if (M.getBufferSize() < Size) { EC = object_error::unexpected_eof; return false; @@ -40,17 +39,25 @@ static bool checkSize(const MemoryBuffer &M, std::error_code &EC, return true; } +static std::error_code checkOffset(MemoryBufferRef M, uintptr_t Addr, + const uint64_t Size) { + if (Addr + Size < Addr || Addr + Size < Size || + Addr + Size > uintptr_t(M.getBufferEnd()) || + Addr < uintptr_t(M.getBufferStart())) { + return object_error::unexpected_eof; + } + return object_error::success; +} + // Sets Obj unless any bytes in [addr, addr + size) fall outsize of m. // Returns unexpected_eof if error. template <typename T> -static std::error_code getObject(const T *&Obj, const MemoryBuffer &M, - const uint8_t *Ptr, - const size_t Size = sizeof(T)) { +static std::error_code getObject(const T *&Obj, MemoryBufferRef M, + const void *Ptr, + const uint64_t Size = sizeof(T)) { uintptr_t Addr = uintptr_t(Ptr); - if (Addr + Size < Addr || Addr + Size < Size || - Addr + Size > uintptr_t(M.getBufferEnd())) { - return object_error::unexpected_eof; - } + if (std::error_code EC = checkOffset(M, Addr, Size)) + return EC; Obj = reinterpret_cast<const T *>(Addr); return object_error::success; } @@ -89,20 +96,19 @@ static bool decodeBase64StringEntry(StringRef Str, uint32_t &Result) { return false; } -const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Ref) const { - const coff_symbol *Addr = reinterpret_cast<const coff_symbol*>(Ref.p); +template <typename coff_symbol_type> +const coff_symbol_type *COFFObjectFile::toSymb(DataRefImpl Ref) const { + const coff_symbol_type *Addr = + reinterpret_cast<const coff_symbol_type *>(Ref.p); -# ifndef NDEBUG + assert(!checkOffset(Data, uintptr_t(Addr), sizeof(*Addr))); +#ifndef NDEBUG // Verify that the symbol points to a valid entry in the symbol table. uintptr_t Offset = uintptr_t(Addr) - uintptr_t(base()); - if (Offset < COFFHeader->PointerToSymbolTable - || Offset >= COFFHeader->PointerToSymbolTable - + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) - report_fatal_error("Symbol was outside of symbol table."); - assert((Offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol) - == 0 && "Symbol did not point to the beginning of a symbol"); -# endif + assert((Offset - getPointerToSymbolTable()) % sizeof(coff_symbol_type) == 0 && + "Symbol did not point to the beginning of a symbol"); +#endif return Addr; } @@ -112,8 +118,7 @@ const coff_section *COFFObjectFile::toSec(DataRefImpl Ref) const { # ifndef NDEBUG // Verify that the section points to a valid entry in the section table. - if (Addr < SectionTable - || Addr >= (SectionTable + COFFHeader->NumberOfSections)) + if (Addr < SectionTable || Addr >= (SectionTable + getNumberOfSections())) report_fatal_error("Section was outside of section table."); uintptr_t Offset = uintptr_t(Addr) - uintptr_t(SectionTable); @@ -125,112 +130,180 @@ const coff_section *COFFObjectFile::toSec(DataRefImpl Ref) const { } void COFFObjectFile::moveSymbolNext(DataRefImpl &Ref) const { - const coff_symbol *Symb = toSymb(Ref); - Symb += 1 + Symb->NumberOfAuxSymbols; - Ref.p = reinterpret_cast<uintptr_t>(Symb); + auto End = reinterpret_cast<uintptr_t>(StringTable); + if (SymbolTable16) { + const coff_symbol16 *Symb = toSymb<coff_symbol16>(Ref); + Symb += 1 + Symb->NumberOfAuxSymbols; + Ref.p = std::min(reinterpret_cast<uintptr_t>(Symb), End); + } else if (SymbolTable32) { + const coff_symbol32 *Symb = toSymb<coff_symbol32>(Ref); + Symb += 1 + Symb->NumberOfAuxSymbols; + Ref.p = std::min(reinterpret_cast<uintptr_t>(Symb), End); + } else { + llvm_unreachable("no symbol table pointer!"); + } } std::error_code COFFObjectFile::getSymbolName(DataRefImpl Ref, StringRef &Result) const { - const coff_symbol *Symb = toSymb(Ref); + COFFSymbolRef Symb = getCOFFSymbol(Ref); return getSymbolName(Symb, Result); } std::error_code COFFObjectFile::getSymbolAddress(DataRefImpl Ref, uint64_t &Result) const { - const coff_symbol *Symb = toSymb(Ref); - const coff_section *Section = nullptr; - if (std::error_code EC = getSection(Symb->SectionNumber, Section)) - return EC; + COFFSymbolRef Symb = getCOFFSymbol(Ref); - if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) + if (Symb.isAnyUndefined()) { Result = UnknownAddressOrSize; - else if (Section) - Result = Section->VirtualAddress + Symb->Value; - else - Result = Symb->Value; + return object_error::success; + } + if (Symb.isCommon()) { + Result = UnknownAddressOrSize; + return object_error::success; + } + int32_t SectionNumber = Symb.getSectionNumber(); + if (!COFF::isReservedSectionNumber(SectionNumber)) { + const coff_section *Section = nullptr; + if (std::error_code EC = getSection(SectionNumber, Section)) + return EC; + + Result = Section->VirtualAddress + Symb.getValue(); + return object_error::success; + } + + Result = Symb.getValue(); return object_error::success; } std::error_code COFFObjectFile::getSymbolType(DataRefImpl Ref, SymbolRef::Type &Result) const { - const coff_symbol *Symb = toSymb(Ref); + COFFSymbolRef Symb = getCOFFSymbol(Ref); + int32_t SectionNumber = Symb.getSectionNumber(); Result = SymbolRef::ST_Other; - if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL && - Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) { + + if (Symb.isAnyUndefined()) { Result = SymbolRef::ST_Unknown; - } else if (Symb->isFunctionDefinition()) { + } else if (Symb.isFunctionDefinition()) { Result = SymbolRef::ST_Function; - } else { - uint32_t Characteristics = 0; - if (!COFF::isReservedSectionNumber(Symb->SectionNumber)) { - const coff_section *Section = nullptr; - if (std::error_code EC = getSection(Symb->SectionNumber, Section)) - return EC; - Characteristics = Section->Characteristics; - } - if (Characteristics & COFF::IMAGE_SCN_MEM_READ && - ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only. + } else if (Symb.isCommon()) { + Result = SymbolRef::ST_Data; + } else if (Symb.isFileRecord()) { + Result = SymbolRef::ST_File; + } else if (SectionNumber == COFF::IMAGE_SYM_DEBUG) { + Result = SymbolRef::ST_Debug; + } else if (!COFF::isReservedSectionNumber(SectionNumber)) { + const coff_section *Section = nullptr; + if (std::error_code EC = getSection(SectionNumber, Section)) + return EC; + uint32_t Characteristics = Section->Characteristics; + if (Characteristics & COFF::IMAGE_SCN_CNT_CODE) + Result = SymbolRef::ST_Function; + else if (Characteristics & (COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | + COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)) Result = SymbolRef::ST_Data; } return object_error::success; } uint32_t COFFObjectFile::getSymbolFlags(DataRefImpl Ref) const { - const coff_symbol *Symb = toSymb(Ref); + COFFSymbolRef Symb = getCOFFSymbol(Ref); uint32_t Result = SymbolRef::SF_None; - // TODO: Correctly set SF_FormatSpecific, SF_Common - - if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) { - if (Symb->Value == 0) - Result |= SymbolRef::SF_Undefined; - else - Result |= SymbolRef::SF_Common; - } - - - // TODO: This are certainly too restrictive. - if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL) + if (Symb.isExternal() || Symb.isWeakExternal()) Result |= SymbolRef::SF_Global; - if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) + if (Symb.isWeakExternal()) Result |= SymbolRef::SF_Weak; - if (Symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE) + if (Symb.getSectionNumber() == COFF::IMAGE_SYM_ABSOLUTE) Result |= SymbolRef::SF_Absolute; + if (Symb.isFileRecord()) + Result |= SymbolRef::SF_FormatSpecific; + + if (Symb.isSectionDefinition()) + Result |= SymbolRef::SF_FormatSpecific; + + if (Symb.isCommon()) + Result |= SymbolRef::SF_Common; + + if (Symb.isAnyUndefined()) + Result |= SymbolRef::SF_Undefined; + return Result; } std::error_code COFFObjectFile::getSymbolSize(DataRefImpl Ref, uint64_t &Result) const { - // FIXME: Return the correct size. This requires looking at all the symbols - // in the same section as this symbol, and looking for either the next - // symbol, or the end of the section. - const coff_symbol *Symb = toSymb(Ref); - const coff_section *Section = nullptr; - if (std::error_code EC = getSection(Symb->SectionNumber, Section)) - return EC; + COFFSymbolRef Symb = getCOFFSymbol(Ref); - if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) + if (Symb.isAnyUndefined()) { Result = UnknownAddressOrSize; - else if (Section) - Result = Section->SizeOfRawData - Symb->Value; - else + return object_error::success; + } + if (Symb.isCommon()) { + Result = Symb.getValue(); + return object_error::success; + } + + // Let's attempt to get the size of the symbol by looking at the address of + // the symbol after the symbol in question. + uint64_t SymbAddr; + if (std::error_code EC = getSymbolAddress(Ref, SymbAddr)) + return EC; + int32_t SectionNumber = Symb.getSectionNumber(); + if (COFF::isReservedSectionNumber(SectionNumber)) { + // Absolute and debug symbols aren't sorted in any interesting way. Result = 0; + return object_error::success; + } + const section_iterator SecEnd = section_end(); + uint64_t AfterAddr = UnknownAddressOrSize; + for (const symbol_iterator &SymbI : symbols()) { + section_iterator SecI = SecEnd; + if (std::error_code EC = SymbI->getSection(SecI)) + return EC; + // Check the symbol's section, skip it if it's in the wrong section. + // First, make sure it is in any section. + if (SecI == SecEnd) + continue; + // Second, make sure it is in the same section as the symbol in question. + if (!sectionContainsSymbol(SecI->getRawDataRefImpl(), Ref)) + continue; + uint64_t Addr; + if (std::error_code EC = SymbI->getAddress(Addr)) + return EC; + // We want to compare our symbol in question with the closest possible + // symbol that comes after. + if (AfterAddr > Addr && Addr > SymbAddr) + AfterAddr = Addr; + } + if (AfterAddr == UnknownAddressOrSize) { + // No symbol comes after this one, assume that everything after our symbol + // is part of it. + const coff_section *Section = nullptr; + if (std::error_code EC = getSection(SectionNumber, Section)) + return EC; + Result = Section->SizeOfRawData - Symb.getValue(); + } else { + // Take the difference between our symbol and the symbol that comes after + // our symbol. + Result = AfterAddr - SymbAddr; + } + return object_error::success; } std::error_code COFFObjectFile::getSymbolSection(DataRefImpl Ref, section_iterator &Result) const { - const coff_symbol *Symb = toSymb(Ref); - if (COFF::isReservedSectionNumber(Symb->SectionNumber)) { + COFFSymbolRef Symb = getCOFFSymbol(Ref); + if (COFF::isReservedSectionNumber(Symb.getSectionNumber())) { Result = section_end(); } else { const coff_section *Sec = nullptr; - if (std::error_code EC = getSection(Symb->SectionNumber, Sec)) + if (std::error_code EC = getSection(Symb.getSectionNumber(), Sec)) return EC; DataRefImpl Ref; Ref.p = reinterpret_cast<uintptr_t>(Sec); @@ -251,18 +324,13 @@ std::error_code COFFObjectFile::getSectionName(DataRefImpl Ref, return getSectionName(Sec, Result); } -std::error_code COFFObjectFile::getSectionAddress(DataRefImpl Ref, - uint64_t &Result) const { +uint64_t COFFObjectFile::getSectionAddress(DataRefImpl Ref) const { const coff_section *Sec = toSec(Ref); - Result = Sec->VirtualAddress; - return object_error::success; + return Sec->VirtualAddress; } -std::error_code COFFObjectFile::getSectionSize(DataRefImpl Ref, - uint64_t &Result) const { - const coff_section *Sec = toSec(Ref); - Result = Sec->SizeOfRawData; - return object_error::success; +uint64_t COFFObjectFile::getSectionSize(DataRefImpl Ref) const { + return getSectionSize(toSec(Ref)); } std::error_code COFFObjectFile::getSectionContents(DataRefImpl Ref, @@ -274,146 +342,144 @@ std::error_code COFFObjectFile::getSectionContents(DataRefImpl Ref, return EC; } -std::error_code COFFObjectFile::getSectionAlignment(DataRefImpl Ref, - uint64_t &Res) const { +uint64_t COFFObjectFile::getSectionAlignment(DataRefImpl Ref) const { const coff_section *Sec = toSec(Ref); - if (!Sec) - return object_error::parse_failed; - Res = uint64_t(1) << (((Sec->Characteristics & 0x00F00000) >> 20) - 1); - return object_error::success; + return uint64_t(1) << (((Sec->Characteristics & 0x00F00000) >> 20) - 1); } -std::error_code COFFObjectFile::isSectionText(DataRefImpl Ref, - bool &Result) const { +bool COFFObjectFile::isSectionText(DataRefImpl Ref) const { const coff_section *Sec = toSec(Ref); - Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE; - return object_error::success; + return Sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE; } -std::error_code COFFObjectFile::isSectionData(DataRefImpl Ref, - bool &Result) const { +bool COFFObjectFile::isSectionData(DataRefImpl Ref) const { const coff_section *Sec = toSec(Ref); - Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA; - return object_error::success; + return Sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA; } -std::error_code COFFObjectFile::isSectionBSS(DataRefImpl Ref, - bool &Result) const { +bool COFFObjectFile::isSectionBSS(DataRefImpl Ref) const { const coff_section *Sec = toSec(Ref); - Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; - return object_error::success; + return Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; } -std::error_code -COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Ref, - bool &Result) const { - // FIXME: Unimplemented - Result = true; - return object_error::success; +bool COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Ref) const { + // Sections marked 'Info', 'Remove', or 'Discardable' aren't required for + // execution. + const coff_section *Sec = toSec(Ref); + return !(Sec->Characteristics & + (COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE | + COFF::IMAGE_SCN_MEM_DISCARDABLE)); } -std::error_code COFFObjectFile::isSectionVirtual(DataRefImpl Ref, - bool &Result) const { +bool COFFObjectFile::isSectionVirtual(DataRefImpl Ref) const { const coff_section *Sec = toSec(Ref); - Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; - return object_error::success; + return Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; } -std::error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Ref, - bool &Result) const { - // FIXME: Unimplemented. - Result = false; - return object_error::success; +bool COFFObjectFile::isSectionZeroInit(DataRefImpl Ref) const { + const coff_section *Sec = toSec(Ref); + return Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; } -std::error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Ref, - bool &Result) const { - // FIXME: Unimplemented. - Result = false; - return object_error::success; +bool COFFObjectFile::isSectionReadOnlyData(DataRefImpl Ref) const { + const coff_section *Sec = toSec(Ref); + // Check if it's any sort of data section. + if (!(Sec->Characteristics & (COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | + COFF::IMAGE_SCN_CNT_INITIALIZED_DATA))) + return false; + // If it's writable or executable or contains code, it isn't read-only data. + if (Sec->Characteristics & + (COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | + COFF::IMAGE_SCN_MEM_WRITE)) + return false; + return true; } -std::error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl SecRef, - DataRefImpl SymbRef, - bool &Result) const { +bool COFFObjectFile::sectionContainsSymbol(DataRefImpl SecRef, + DataRefImpl SymbRef) const { const coff_section *Sec = toSec(SecRef); - const coff_symbol *Symb = toSymb(SymbRef); - const coff_section *SymbSec = nullptr; - if (std::error_code EC = getSection(Symb->SectionNumber, SymbSec)) - return EC; - if (SymbSec == Sec) - Result = true; - else - Result = false; - return object_error::success; -} - -relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Ref) const { - const coff_section *Sec = toSec(Ref); - DataRefImpl Ret; - if (Sec->NumberOfRelocations == 0) { - Ret.p = 0; - } else { - auto begin = reinterpret_cast<const coff_relocation*>( - base() + Sec->PointerToRelocations); - if (Sec->hasExtendedRelocations()) { - // Skip the first relocation entry repurposed to store the number of - // relocations. - begin++; - } - Ret.p = reinterpret_cast<uintptr_t>(begin); - } - return relocation_iterator(RelocationRef(Ret, this)); + COFFSymbolRef Symb = getCOFFSymbol(SymbRef); + int32_t SecNumber = (Sec - SectionTable) + 1; + return SecNumber == Symb.getSectionNumber(); } static uint32_t getNumberOfRelocations(const coff_section *Sec, - const uint8_t *base) { + MemoryBufferRef M, const uint8_t *base) { // The field for the number of relocations in COFF section table is only // 16-bit wide. If a section has more than 65535 relocations, 0xFFFF is set to // NumberOfRelocations field, and the actual relocation count is stored in the // VirtualAddress field in the first relocation entry. if (Sec->hasExtendedRelocations()) { - auto *FirstReloc = reinterpret_cast<const coff_relocation*>( - base + Sec->PointerToRelocations); + const coff_relocation *FirstReloc; + if (getObject(FirstReloc, M, reinterpret_cast<const coff_relocation*>( + base + Sec->PointerToRelocations))) + return 0; return FirstReloc->VirtualAddress; } return Sec->NumberOfRelocations; } +static const coff_relocation * +getFirstReloc(const coff_section *Sec, MemoryBufferRef M, const uint8_t *Base) { + uint64_t NumRelocs = getNumberOfRelocations(Sec, M, Base); + if (!NumRelocs) + return nullptr; + auto begin = reinterpret_cast<const coff_relocation *>( + Base + Sec->PointerToRelocations); + if (Sec->hasExtendedRelocations()) { + // Skip the first relocation entry repurposed to store the number of + // relocations. + begin++; + } + if (checkOffset(M, uintptr_t(begin), sizeof(coff_relocation) * NumRelocs)) + return nullptr; + return begin; +} + +relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Ref) const { + const coff_section *Sec = toSec(Ref); + const coff_relocation *begin = getFirstReloc(Sec, Data, base()); + DataRefImpl Ret; + Ret.p = reinterpret_cast<uintptr_t>(begin); + return relocation_iterator(RelocationRef(Ret, this)); +} + relocation_iterator COFFObjectFile::section_rel_end(DataRefImpl Ref) const { const coff_section *Sec = toSec(Ref); + const coff_relocation *I = getFirstReloc(Sec, Data, base()); + if (I) + I += getNumberOfRelocations(Sec, Data, base()); DataRefImpl Ret; - if (Sec->NumberOfRelocations == 0) { - Ret.p = 0; - } else { - auto begin = reinterpret_cast<const coff_relocation*>( - base() + Sec->PointerToRelocations); - uint32_t NumReloc = getNumberOfRelocations(Sec, base()); - Ret.p = reinterpret_cast<uintptr_t>(begin + NumReloc); - } + Ret.p = reinterpret_cast<uintptr_t>(I); return relocation_iterator(RelocationRef(Ret, this)); } // Initialize the pointer to the symbol table. std::error_code COFFObjectFile::initSymbolTablePtr() { - if (std::error_code EC = getObject( - SymbolTable, *Data, base() + COFFHeader->PointerToSymbolTable, - COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) - return EC; + if (COFFHeader) + if (std::error_code EC = getObject( + SymbolTable16, Data, base() + getPointerToSymbolTable(), + (uint64_t)getNumberOfSymbols() * getSymbolTableEntrySize())) + return EC; + + if (COFFBigObjHeader) + if (std::error_code EC = getObject( + SymbolTable32, Data, base() + getPointerToSymbolTable(), + (uint64_t)getNumberOfSymbols() * getSymbolTableEntrySize())) + return EC; // Find string table. The first four byte of the string table contains the // total size of the string table, including the size field itself. If the // string table is empty, the value of the first four byte would be 4. - const uint8_t *StringTableAddr = - base() + COFFHeader->PointerToSymbolTable + - COFFHeader->NumberOfSymbols * sizeof(coff_symbol); + uint32_t StringTableOffset = getPointerToSymbolTable() + + getNumberOfSymbols() * getSymbolTableEntrySize(); + const uint8_t *StringTableAddr = base() + StringTableOffset; const ulittle32_t *StringTableSizePtr; - if (std::error_code EC = - getObject(StringTableSizePtr, *Data, StringTableAddr)) + if (std::error_code EC = getObject(StringTableSizePtr, Data, StringTableAddr)) return EC; StringTableSize = *StringTableSizePtr; if (std::error_code EC = - getObject(StringTable, *Data, StringTableAddr, StringTableSize)) + getObject(StringTable, Data, StringTableAddr, StringTableSize)) return EC; // Treat table sizes < 4 as empty because contrary to the PECOFF spec, some @@ -477,8 +543,9 @@ std::error_code COFFObjectFile::initImportTablePtr() { return object_error::success; uint32_t ImportTableRva = DataEntry->RelativeVirtualAddress; + // -1 because the last entry is the null entry. NumberOfImportDirectory = DataEntry->Size / - sizeof(import_directory_table_entry); + sizeof(import_directory_table_entry) - 1; // Find the section that contains the RVA. This is needed because the RVA is // the import table's memory address which is different from its file offset. @@ -490,6 +557,26 @@ std::error_code COFFObjectFile::initImportTablePtr() { return object_error::success; } +// Initializes DelayImportDirectory and NumberOfDelayImportDirectory. +std::error_code COFFObjectFile::initDelayImportTablePtr() { + const data_directory *DataEntry; + if (getDataDirectory(COFF::DELAY_IMPORT_DESCRIPTOR, DataEntry)) + return object_error::success; + if (DataEntry->RelativeVirtualAddress == 0) + return object_error::success; + + uint32_t RVA = DataEntry->RelativeVirtualAddress; + NumberOfDelayImportDirectory = DataEntry->Size / + sizeof(delay_import_directory_table_entry) - 1; + + uintptr_t IntPtr = 0; + if (std::error_code EC = getRvaPtr(RVA, IntPtr)) + return EC; + DelayImportDirectory = reinterpret_cast< + const delay_import_directory_table_entry *>(IntPtr); + return object_error::success; +} + // Find the export table. std::error_code COFFObjectFile::initExportTablePtr() { // First, we get the RVA of the export table. If the file lacks a pointer to @@ -511,15 +598,34 @@ std::error_code COFFObjectFile::initExportTablePtr() { return object_error::success; } -COFFObjectFile::COFFObjectFile(std::unique_ptr<MemoryBuffer> Object, - std::error_code &EC) - : ObjectFile(Binary::ID_COFF, std::move(Object)), COFFHeader(nullptr), - PE32Header(nullptr), PE32PlusHeader(nullptr), DataDirectory(nullptr), - SectionTable(nullptr), SymbolTable(nullptr), StringTable(nullptr), - StringTableSize(0), ImportDirectory(nullptr), NumberOfImportDirectory(0), - ExportDirectory(nullptr) { +std::error_code COFFObjectFile::initBaseRelocPtr() { + const data_directory *DataEntry; + if (getDataDirectory(COFF::BASE_RELOCATION_TABLE, DataEntry)) + return object_error::success; + if (DataEntry->RelativeVirtualAddress == 0) + return object_error::success; + + uintptr_t IntPtr = 0; + if (std::error_code EC = getRvaPtr(DataEntry->RelativeVirtualAddress, IntPtr)) + return EC; + BaseRelocHeader = reinterpret_cast<const coff_base_reloc_block_header *>( + IntPtr); + BaseRelocEnd = reinterpret_cast<coff_base_reloc_block_header *>( + IntPtr + DataEntry->Size); + return object_error::success; +} + +COFFObjectFile::COFFObjectFile(MemoryBufferRef Object, std::error_code &EC) + : ObjectFile(Binary::ID_COFF, Object), COFFHeader(nullptr), + COFFBigObjHeader(nullptr), PE32Header(nullptr), PE32PlusHeader(nullptr), + DataDirectory(nullptr), SectionTable(nullptr), SymbolTable16(nullptr), + SymbolTable32(nullptr), StringTable(nullptr), StringTableSize(0), + ImportDirectory(nullptr), NumberOfImportDirectory(0), + DelayImportDirectory(nullptr), NumberOfDelayImportDirectory(0), + ExportDirectory(nullptr), BaseRelocHeader(nullptr), + BaseRelocEnd(nullptr) { // Check that we at least have enough room for a header. - if (!checkSize(*Data, EC, sizeof(coff_file_header))) + if (!checkSize(Data, EC, sizeof(coff_file_header))) return; // The current location in the file where we are looking at. @@ -530,37 +636,66 @@ COFFObjectFile::COFFObjectFile(std::unique_ptr<MemoryBuffer> Object, bool HasPEHeader = false; // Check if this is a PE/COFF file. - if (base()[0] == 0x4d && base()[1] == 0x5a) { + if (checkSize(Data, EC, sizeof(dos_header) + sizeof(COFF::PEMagic))) { // PE/COFF, seek through MS-DOS compatibility stub and 4-byte // PE signature to find 'normal' COFF header. - if (!checkSize(*Data, EC, 0x3c + 8)) - return; - CurPtr = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c); - // Check the PE magic bytes. ("PE\0\0") - if (std::memcmp(base() + CurPtr, "PE\0\0", 4) != 0) { - EC = object_error::parse_failed; - return; + const auto *DH = reinterpret_cast<const dos_header *>(base()); + if (DH->Magic[0] == 'M' && DH->Magic[1] == 'Z') { + CurPtr = DH->AddressOfNewExeHeader; + // Check the PE magic bytes. ("PE\0\0") + if (memcmp(base() + CurPtr, COFF::PEMagic, sizeof(COFF::PEMagic)) != 0) { + EC = object_error::parse_failed; + return; + } + CurPtr += sizeof(COFF::PEMagic); // Skip the PE magic bytes. + HasPEHeader = true; } - CurPtr += 4; // Skip the PE magic bytes. - HasPEHeader = true; } - if ((EC = getObject(COFFHeader, *Data, base() + CurPtr))) + if ((EC = getObject(COFFHeader, Data, base() + CurPtr))) return; - CurPtr += sizeof(coff_file_header); + + // It might be a bigobj file, let's check. Note that COFF bigobj and COFF + // import libraries share a common prefix but bigobj is more restrictive. + if (!HasPEHeader && COFFHeader->Machine == COFF::IMAGE_FILE_MACHINE_UNKNOWN && + COFFHeader->NumberOfSections == uint16_t(0xffff) && + checkSize(Data, EC, sizeof(coff_bigobj_file_header))) { + if ((EC = getObject(COFFBigObjHeader, Data, base() + CurPtr))) + return; + + // Verify that we are dealing with bigobj. + if (COFFBigObjHeader->Version >= COFF::BigObjHeader::MinBigObjectVersion && + std::memcmp(COFFBigObjHeader->UUID, COFF::BigObjMagic, + sizeof(COFF::BigObjMagic)) == 0) { + COFFHeader = nullptr; + CurPtr += sizeof(coff_bigobj_file_header); + } else { + // It's not a bigobj. + COFFBigObjHeader = nullptr; + } + } + if (COFFHeader) { + // The prior checkSize call may have failed. This isn't a hard error + // because we were just trying to sniff out bigobj. + EC = object_error::success; + CurPtr += sizeof(coff_file_header); + + if (COFFHeader->isImportLibrary()) + return; + } if (HasPEHeader) { const pe32_header *Header; - if ((EC = getObject(Header, *Data, base() + CurPtr))) + if ((EC = getObject(Header, Data, base() + CurPtr))) return; const uint8_t *DataDirAddr; uint64_t DataDirSize; - if (Header->Magic == 0x10b) { + if (Header->Magic == COFF::PE32Header::PE32) { PE32Header = Header; DataDirAddr = base() + CurPtr + sizeof(pe32_header); DataDirSize = sizeof(data_directory) * PE32Header->NumberOfRvaAndSize; - } else if (Header->Magic == 0x20b) { + } else if (Header->Magic == COFF::PE32Header::PE32_PLUS) { PE32PlusHeader = reinterpret_cast<const pe32plus_header *>(Header); DataDirAddr = base() + CurPtr + sizeof(pe32plus_header); DataDirSize = sizeof(data_directory) * PE32PlusHeader->NumberOfRvaAndSize; @@ -569,37 +704,47 @@ COFFObjectFile::COFFObjectFile(std::unique_ptr<MemoryBuffer> Object, EC = object_error::parse_failed; return; } - if ((EC = getObject(DataDirectory, *Data, DataDirAddr, DataDirSize))) + if ((EC = getObject(DataDirectory, Data, DataDirAddr, DataDirSize))) return; CurPtr += COFFHeader->SizeOfOptionalHeader; } - if (COFFHeader->isImportLibrary()) - return; - - if ((EC = getObject(SectionTable, *Data, base() + CurPtr, - COFFHeader->NumberOfSections * sizeof(coff_section)))) + if ((EC = getObject(SectionTable, Data, base() + CurPtr, + (uint64_t)getNumberOfSections() * sizeof(coff_section)))) return; // Initialize the pointer to the symbol table. - if (COFFHeader->PointerToSymbolTable != 0) + if (getPointerToSymbolTable() != 0) { if ((EC = initSymbolTablePtr())) return; + } else { + // We had better not have any symbols if we don't have a symbol table. + if (getNumberOfSymbols() != 0) { + EC = object_error::parse_failed; + return; + } + } // Initialize the pointer to the beginning of the import table. if ((EC = initImportTablePtr())) return; + if ((EC = initDelayImportTablePtr())) + return; // Initialize the pointer to the export table. if ((EC = initExportTablePtr())) return; + // Initialize the pointer to the base relocation table. + if ((EC = initBaseRelocPtr())) + return; + EC = object_error::success; } basic_symbol_iterator COFFObjectFile::symbol_begin_impl() const { DataRefImpl Ret; - Ret.p = reinterpret_cast<uintptr_t>(SymbolTable); + Ret.p = getSymbolTable(); return basic_symbol_iterator(SymbolRef(Ret, this)); } @@ -610,21 +755,6 @@ basic_symbol_iterator COFFObjectFile::symbol_end_impl() const { return basic_symbol_iterator(SymbolRef(Ret, this)); } -library_iterator COFFObjectFile::needed_library_begin() const { - // TODO: implement - report_fatal_error("Libraries needed unimplemented in COFFObjectFile"); -} - -library_iterator COFFObjectFile::needed_library_end() const { - // TODO: implement - report_fatal_error("Libraries needed unimplemented in COFFObjectFile"); -} - -StringRef COFFObjectFile::getLoadName() const { - // COFF does not have this field. - return ""; -} - import_directory_iterator COFFObjectFile::import_directory_begin() const { return import_directory_iterator( ImportDirectoryEntryRef(ImportDirectory, 0, this)); @@ -635,6 +765,19 @@ import_directory_iterator COFFObjectFile::import_directory_end() const { ImportDirectoryEntryRef(ImportDirectory, NumberOfImportDirectory, this)); } +delay_import_directory_iterator +COFFObjectFile::delay_import_directory_begin() const { + return delay_import_directory_iterator( + DelayImportDirectoryEntryRef(DelayImportDirectory, 0, this)); +} + +delay_import_directory_iterator +COFFObjectFile::delay_import_directory_end() const { + return delay_import_directory_iterator( + DelayImportDirectoryEntryRef( + DelayImportDirectory, NumberOfDelayImportDirectory, this)); +} + export_directory_iterator COFFObjectFile::export_directory_begin() const { return export_directory_iterator( ExportDirectoryEntryRef(ExportDirectory, 0, this)); @@ -656,18 +799,26 @@ section_iterator COFFObjectFile::section_begin() const { section_iterator COFFObjectFile::section_end() const { DataRefImpl Ret; - int NumSections = COFFHeader->isImportLibrary() - ? 0 : COFFHeader->NumberOfSections; + int NumSections = + COFFHeader && COFFHeader->isImportLibrary() ? 0 : getNumberOfSections(); Ret.p = reinterpret_cast<uintptr_t>(SectionTable + NumSections); return section_iterator(SectionRef(Ret, this)); } +base_reloc_iterator COFFObjectFile::base_reloc_begin() const { + return base_reloc_iterator(BaseRelocRef(BaseRelocHeader, this)); +} + +base_reloc_iterator COFFObjectFile::base_reloc_end() const { + return base_reloc_iterator(BaseRelocRef(BaseRelocEnd, this)); +} + uint8_t COFFObjectFile::getBytesInAddress() const { return getArch() == Triple::x86_64 ? 8 : 4; } StringRef COFFObjectFile::getFileFormatName() const { - switch(COFFHeader->Machine) { + switch(getMachine()) { case COFF::IMAGE_FILE_MACHINE_I386: return "COFF-i386"; case COFF::IMAGE_FILE_MACHINE_AMD64: @@ -680,7 +831,7 @@ StringRef COFFObjectFile::getFileFormatName() const { } unsigned COFFObjectFile::getArch() const { - switch(COFFHeader->Machine) { + switch (getMachine()) { case COFF::IMAGE_FILE_MACHINE_I386: return Triple::x86; case COFF::IMAGE_FILE_MACHINE_AMD64: @@ -692,16 +843,24 @@ unsigned COFFObjectFile::getArch() const { } } -// This method is kept here because lld uses this. As soon as we make -// lld to use getCOFFHeader, this method will be removed. -std::error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const { - return getCOFFHeader(Res); +iterator_range<import_directory_iterator> +COFFObjectFile::import_directories() const { + return make_range(import_directory_begin(), import_directory_end()); } -std::error_code -COFFObjectFile::getCOFFHeader(const coff_file_header *&Res) const { - Res = COFFHeader; - return object_error::success; +iterator_range<delay_import_directory_iterator> +COFFObjectFile::delay_import_directories() const { + return make_range(delay_import_directory_begin(), + delay_import_directory_end()); +} + +iterator_range<export_directory_iterator> +COFFObjectFile::export_directories() const { + return make_range(export_directory_begin(), export_directory_end()); +} + +iterator_range<base_reloc_iterator> COFFObjectFile::base_relocs() const { + return make_range(base_reloc_begin(), base_reloc_end()); } std::error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const { @@ -719,28 +878,32 @@ std::error_code COFFObjectFile::getDataDirectory(uint32_t Index, const data_directory *&Res) const { // Error if if there's no data directory or the index is out of range. - if (!DataDirectory) + if (!DataDirectory) { + Res = nullptr; return object_error::parse_failed; + } assert(PE32Header || PE32PlusHeader); uint32_t NumEnt = PE32Header ? PE32Header->NumberOfRvaAndSize : PE32PlusHeader->NumberOfRvaAndSize; - if (Index > NumEnt) + if (Index >= NumEnt) { + Res = nullptr; return object_error::parse_failed; + } Res = &DataDirectory[Index]; return object_error::success; } std::error_code COFFObjectFile::getSection(int32_t Index, const coff_section *&Result) const { - // Check for special index values. + Result = nullptr; if (COFF::isReservedSectionNumber(Index)) - Result = nullptr; - else if (Index > 0 && Index <= COFFHeader->NumberOfSections) + return object_error::success; + if (static_cast<uint32_t>(Index) <= getNumberOfSections()) { // We already verified the section table data, so no need to check again. Result = SectionTable + (Index - 1); - else - return object_error::parse_failed; - return object_error::success; + return object_error::success; + } + return object_error::parse_failed; } std::error_code COFFObjectFile::getString(uint32_t Offset, @@ -754,71 +917,62 @@ std::error_code COFFObjectFile::getString(uint32_t Offset, return object_error::success; } -std::error_code COFFObjectFile::getSymbol(uint32_t Index, - const coff_symbol *&Result) const { - if (Index < COFFHeader->NumberOfSymbols) - Result = SymbolTable + Index; - else - return object_error::parse_failed; - return object_error::success; -} - -std::error_code COFFObjectFile::getSymbolName(const coff_symbol *Symbol, +std::error_code COFFObjectFile::getSymbolName(COFFSymbolRef Symbol, StringRef &Res) const { // Check for string table entry. First 4 bytes are 0. - if (Symbol->Name.Offset.Zeroes == 0) { - uint32_t Offset = Symbol->Name.Offset.Offset; + if (Symbol.getStringTableOffset().Zeroes == 0) { + uint32_t Offset = Symbol.getStringTableOffset().Offset; if (std::error_code EC = getString(Offset, Res)) return EC; return object_error::success; } - if (Symbol->Name.ShortName[7] == 0) + if (Symbol.getShortName()[COFF::NameSize - 1] == 0) // Null terminated, let ::strlen figure out the length. - Res = StringRef(Symbol->Name.ShortName); + Res = StringRef(Symbol.getShortName()); else // Not null terminated, use all 8 bytes. - Res = StringRef(Symbol->Name.ShortName, 8); + Res = StringRef(Symbol.getShortName(), COFF::NameSize); return object_error::success; } -ArrayRef<uint8_t> COFFObjectFile::getSymbolAuxData( - const coff_symbol *Symbol) const { +ArrayRef<uint8_t> +COFFObjectFile::getSymbolAuxData(COFFSymbolRef Symbol) const { const uint8_t *Aux = nullptr; - if (Symbol->NumberOfAuxSymbols > 0) { - // AUX data comes immediately after the symbol in COFF - Aux = reinterpret_cast<const uint8_t *>(Symbol + 1); + size_t SymbolSize = getSymbolTableEntrySize(); + if (Symbol.getNumberOfAuxSymbols() > 0) { + // AUX data comes immediately after the symbol in COFF + Aux = reinterpret_cast<const uint8_t *>(Symbol.getRawPtr()) + SymbolSize; # ifndef NDEBUG // Verify that the Aux symbol points to a valid entry in the symbol table. uintptr_t Offset = uintptr_t(Aux) - uintptr_t(base()); - if (Offset < COFFHeader->PointerToSymbolTable - || Offset >= COFFHeader->PointerToSymbolTable - + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol))) + if (Offset < getPointerToSymbolTable() || + Offset >= + getPointerToSymbolTable() + (getNumberOfSymbols() * SymbolSize)) report_fatal_error("Aux Symbol data was outside of symbol table."); - assert((Offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol) - == 0 && "Aux Symbol data did not point to the beginning of a symbol"); + assert((Offset - getPointerToSymbolTable()) % SymbolSize == 0 && + "Aux Symbol data did not point to the beginning of a symbol"); # endif } - return ArrayRef<uint8_t>(Aux, - Symbol->NumberOfAuxSymbols * sizeof(coff_symbol)); + return makeArrayRef(Aux, Symbol.getNumberOfAuxSymbols() * SymbolSize); } std::error_code COFFObjectFile::getSectionName(const coff_section *Sec, StringRef &Res) const { StringRef Name; - if (Sec->Name[7] == 0) + if (Sec->Name[COFF::NameSize - 1] == 0) // Null terminated, let ::strlen figure out the length. Name = Sec->Name; else // Not null terminated, use all 8 bytes. - Name = StringRef(Sec->Name, 8); + Name = StringRef(Sec->Name, COFF::NameSize); // Check for string table entry. First byte is '/'. - if (Name[0] == '/') { + if (Name.startswith("/")) { uint32_t Offset; - if (Name[1] == '/') { + if (Name.startswith("//")) { if (decodeBase64StringEntry(Name.substr(2), Offset)) return object_error::parse_failed; } else { @@ -833,18 +987,41 @@ std::error_code COFFObjectFile::getSectionName(const coff_section *Sec, return object_error::success; } +uint64_t COFFObjectFile::getSectionSize(const coff_section *Sec) const { + // SizeOfRawData and VirtualSize change what they represent depending on + // whether or not we have an executable image. + // + // For object files, SizeOfRawData contains the size of section's data; + // VirtualSize is always zero. + // + // For executables, SizeOfRawData *must* be a multiple of FileAlignment; the + // actual section size is in VirtualSize. It is possible for VirtualSize to + // be greater than SizeOfRawData; the contents past that point should be + // considered to be zero. + uint32_t SectionSize; + if (Sec->VirtualSize) + SectionSize = std::min(Sec->VirtualSize, Sec->SizeOfRawData); + else + SectionSize = Sec->SizeOfRawData; + + return SectionSize; +} + std::error_code COFFObjectFile::getSectionContents(const coff_section *Sec, ArrayRef<uint8_t> &Res) const { + // PointerToRawData and SizeOfRawData won't make sense for BSS sections, + // don't do anything interesting for them. + assert((Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0 && + "BSS sections don't have contents!"); // The only thing that we need to verify is that the contents is contained // within the file bounds. We don't need to make sure it doesn't cover other // data, as there's nothing that says that is not allowed. uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData; - uintptr_t ConEnd = ConStart + Sec->SizeOfRawData; - if (ConEnd > uintptr_t(Data->getBufferEnd())) + uint32_t SectionSize = getSectionSize(Sec); + if (checkOffset(Data, ConStart, SectionSize)) return object_error::parse_failed; - Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart), - Sec->SizeOfRawData); + Res = makeArrayRef(reinterpret_cast<const uint8_t *>(ConStart), SectionSize); return object_error::success; } @@ -864,14 +1041,26 @@ std::error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel, std::error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel, uint64_t &Res) const { - Res = toRel(Rel)->VirtualAddress; + const coff_relocation *R = toRel(Rel); + const support::ulittle32_t *VirtualAddressPtr; + if (std::error_code EC = + getObject(VirtualAddressPtr, Data, &R->VirtualAddress)) + return EC; + Res = *VirtualAddressPtr; return object_error::success; } symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const { - const coff_relocation* R = toRel(Rel); + const coff_relocation *R = toRel(Rel); DataRefImpl Ref; - Ref.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex); + if (R->SymbolTableIndex >= getNumberOfSymbols()) + return symbol_end(); + if (SymbolTable16) + Ref.p = reinterpret_cast<uintptr_t>(SymbolTable16 + R->SymbolTableIndex); + else if (SymbolTable32) + Ref.p = reinterpret_cast<uintptr_t>(SymbolTable32 + R->SymbolTableIndex); + else + return symbol_end(); return symbol_iterator(SymbolRef(Ref, this)); } @@ -887,9 +1076,16 @@ COFFObjectFile::getCOFFSection(const SectionRef &Section) const { return toSec(Section.getRawDataRefImpl()); } -const coff_symbol * -COFFObjectFile::getCOFFSymbol(const SymbolRef &Symbol) const { - return toSymb(Symbol.getRawDataRefImpl()); +COFFSymbolRef COFFObjectFile::getCOFFSymbol(const DataRefImpl &Ref) const { + if (SymbolTable16) + return toSymb<coff_symbol16>(Ref); + if (SymbolTable32) + return toSymb<coff_symbol32>(Ref); + llvm_unreachable("no symbol table pointer!"); +} + +COFFSymbolRef COFFObjectFile::getCOFFSymbol(const SymbolRef &Symbol) const { + return getCOFFSymbol(Symbol.getRawDataRefImpl()); } const coff_relocation * @@ -907,7 +1103,7 @@ COFFObjectFile::getRelocationTypeName(DataRefImpl Rel, SmallVectorImpl<char> &Result) const { const coff_relocation *Reloc = toRel(Rel); StringRef Res; - switch (COFFHeader->Machine) { + switch (getMachine()) { case COFF::IMAGE_FILE_MACHINE_AMD64: switch (Reloc->Type) { LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE); @@ -982,11 +1178,11 @@ std::error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel, SmallVectorImpl<char> &Result) const { const coff_relocation *Reloc = toRel(Rel); - const coff_symbol *Symb = nullptr; - if (std::error_code EC = getSymbol(Reloc->SymbolTableIndex, Symb)) - return EC; DataRefImpl Sym; - Sym.p = reinterpret_cast<uintptr_t>(Symb); + ErrorOr<COFFSymbolRef> Symb = getSymbol(Reloc->SymbolTableIndex); + if (std::error_code EC = Symb.getError()) + return EC; + Sym.p = reinterpret_cast<uintptr_t>(Symb->getRawPtr()); StringRef SymName; if (std::error_code EC = getSymbolName(Sym, SymName)) return EC; @@ -994,14 +1190,8 @@ COFFObjectFile::getRelocationValueString(DataRefImpl Rel, return object_error::success; } -std::error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData, - LibraryRef &Result) const { - report_fatal_error("getLibraryNext not implemented in COFFObjectFile"); -} - -std::error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData, - StringRef &Result) const { - report_fatal_error("getLibraryPath not implemented in COFFObjectFile"); +bool COFFObjectFile::isRelocatableObject() const { + return !DataDirectory; } bool ImportDirectoryEntryRef:: @@ -1015,29 +1205,148 @@ void ImportDirectoryEntryRef::moveNext() { std::error_code ImportDirectoryEntryRef::getImportTableEntry( const import_directory_table_entry *&Result) const { - Result = ImportTable; + Result = ImportTable + Index; return object_error::success; } +static imported_symbol_iterator +makeImportedSymbolIterator(const COFFObjectFile *Object, + uintptr_t Ptr, int Index) { + if (Object->getBytesInAddress() == 4) { + auto *P = reinterpret_cast<const import_lookup_table_entry32 *>(Ptr); + return imported_symbol_iterator(ImportedSymbolRef(P, Index, Object)); + } + auto *P = reinterpret_cast<const import_lookup_table_entry64 *>(Ptr); + return imported_symbol_iterator(ImportedSymbolRef(P, Index, Object)); +} + +static imported_symbol_iterator +importedSymbolBegin(uint32_t RVA, const COFFObjectFile *Object) { + uintptr_t IntPtr = 0; + Object->getRvaPtr(RVA, IntPtr); + return makeImportedSymbolIterator(Object, IntPtr, 0); +} + +static imported_symbol_iterator +importedSymbolEnd(uint32_t RVA, const COFFObjectFile *Object) { + uintptr_t IntPtr = 0; + Object->getRvaPtr(RVA, IntPtr); + // Forward the pointer to the last entry which is null. + int Index = 0; + if (Object->getBytesInAddress() == 4) { + auto *Entry = reinterpret_cast<ulittle32_t *>(IntPtr); + while (*Entry++) + ++Index; + } else { + auto *Entry = reinterpret_cast<ulittle64_t *>(IntPtr); + while (*Entry++) + ++Index; + } + return makeImportedSymbolIterator(Object, IntPtr, Index); +} + +imported_symbol_iterator +ImportDirectoryEntryRef::imported_symbol_begin() const { + return importedSymbolBegin(ImportTable[Index].ImportLookupTableRVA, + OwningObject); +} + +imported_symbol_iterator +ImportDirectoryEntryRef::imported_symbol_end() const { + return importedSymbolEnd(ImportTable[Index].ImportLookupTableRVA, + OwningObject); +} + +iterator_range<imported_symbol_iterator> +ImportDirectoryEntryRef::imported_symbols() const { + return make_range(imported_symbol_begin(), imported_symbol_end()); +} + std::error_code ImportDirectoryEntryRef::getName(StringRef &Result) const { uintptr_t IntPtr = 0; if (std::error_code EC = - OwningObject->getRvaPtr(ImportTable->NameRVA, IntPtr)) + OwningObject->getRvaPtr(ImportTable[Index].NameRVA, IntPtr)) return EC; Result = StringRef(reinterpret_cast<const char *>(IntPtr)); return object_error::success; } +std::error_code +ImportDirectoryEntryRef::getImportLookupTableRVA(uint32_t &Result) const { + Result = ImportTable[Index].ImportLookupTableRVA; + return object_error::success; +} + +std::error_code +ImportDirectoryEntryRef::getImportAddressTableRVA(uint32_t &Result) const { + Result = ImportTable[Index].ImportAddressTableRVA; + return object_error::success; +} + std::error_code ImportDirectoryEntryRef::getImportLookupEntry( const import_lookup_table_entry32 *&Result) const { uintptr_t IntPtr = 0; - if (std::error_code EC = - OwningObject->getRvaPtr(ImportTable->ImportLookupTableRVA, IntPtr)) + uint32_t RVA = ImportTable[Index].ImportLookupTableRVA; + if (std::error_code EC = OwningObject->getRvaPtr(RVA, IntPtr)) return EC; Result = reinterpret_cast<const import_lookup_table_entry32 *>(IntPtr); return object_error::success; } +bool DelayImportDirectoryEntryRef:: +operator==(const DelayImportDirectoryEntryRef &Other) const { + return Table == Other.Table && Index == Other.Index; +} + +void DelayImportDirectoryEntryRef::moveNext() { + ++Index; +} + +imported_symbol_iterator +DelayImportDirectoryEntryRef::imported_symbol_begin() const { + return importedSymbolBegin(Table[Index].DelayImportNameTable, + OwningObject); +} + +imported_symbol_iterator +DelayImportDirectoryEntryRef::imported_symbol_end() const { + return importedSymbolEnd(Table[Index].DelayImportNameTable, + OwningObject); +} + +iterator_range<imported_symbol_iterator> +DelayImportDirectoryEntryRef::imported_symbols() const { + return make_range(imported_symbol_begin(), imported_symbol_end()); +} + +std::error_code DelayImportDirectoryEntryRef::getName(StringRef &Result) const { + uintptr_t IntPtr = 0; + if (std::error_code EC = OwningObject->getRvaPtr(Table[Index].Name, IntPtr)) + return EC; + Result = StringRef(reinterpret_cast<const char *>(IntPtr)); + return object_error::success; +} + +std::error_code DelayImportDirectoryEntryRef:: +getDelayImportTable(const delay_import_directory_table_entry *&Result) const { + Result = Table; + return object_error::success; +} + +std::error_code DelayImportDirectoryEntryRef:: +getImportAddress(int AddrIndex, uint64_t &Result) const { + uint32_t RVA = Table[Index].DelayImportAddressTable + + AddrIndex * (OwningObject->is64() ? 8 : 4); + uintptr_t IntPtr = 0; + if (std::error_code EC = OwningObject->getRvaPtr(RVA, IntPtr)) + return EC; + if (OwningObject->is64()) + Result = *reinterpret_cast<const ulittle64_t *>(IntPtr); + else + Result = *reinterpret_cast<const ulittle32_t *>(IntPtr); + return object_error::success; +} + bool ExportDirectoryEntryRef:: operator==(const ExportDirectoryEntryRef &Other) const { return ExportTable == Other.ExportTable && Index == Other.Index; @@ -1112,12 +1421,98 @@ ExportDirectoryEntryRef::getSymbolName(StringRef &Result) const { return object_error::success; } -ErrorOr<ObjectFile *> -ObjectFile::createCOFFObjectFile(std::unique_ptr<MemoryBuffer> Object) { +bool ImportedSymbolRef:: +operator==(const ImportedSymbolRef &Other) const { + return Entry32 == Other.Entry32 && Entry64 == Other.Entry64 + && Index == Other.Index; +} + +void ImportedSymbolRef::moveNext() { + ++Index; +} + +std::error_code +ImportedSymbolRef::getSymbolName(StringRef &Result) const { + uint32_t RVA; + if (Entry32) { + // If a symbol is imported only by ordinal, it has no name. + if (Entry32[Index].isOrdinal()) + return object_error::success; + RVA = Entry32[Index].getHintNameRVA(); + } else { + if (Entry64[Index].isOrdinal()) + return object_error::success; + RVA = Entry64[Index].getHintNameRVA(); + } + uintptr_t IntPtr = 0; + if (std::error_code EC = OwningObject->getRvaPtr(RVA, IntPtr)) + return EC; + // +2 because the first two bytes is hint. + Result = StringRef(reinterpret_cast<const char *>(IntPtr + 2)); + return object_error::success; +} + +std::error_code ImportedSymbolRef::getOrdinal(uint16_t &Result) const { + uint32_t RVA; + if (Entry32) { + if (Entry32[Index].isOrdinal()) { + Result = Entry32[Index].getOrdinal(); + return object_error::success; + } + RVA = Entry32[Index].getHintNameRVA(); + } else { + if (Entry64[Index].isOrdinal()) { + Result = Entry64[Index].getOrdinal(); + return object_error::success; + } + RVA = Entry64[Index].getHintNameRVA(); + } + uintptr_t IntPtr = 0; + if (std::error_code EC = OwningObject->getRvaPtr(RVA, IntPtr)) + return EC; + Result = *reinterpret_cast<const ulittle16_t *>(IntPtr); + return object_error::success; +} + +ErrorOr<std::unique_ptr<COFFObjectFile>> +ObjectFile::createCOFFObjectFile(MemoryBufferRef Object) { std::error_code EC; - std::unique_ptr<COFFObjectFile> Ret( - new COFFObjectFile(std::move(Object), EC)); + std::unique_ptr<COFFObjectFile> Ret(new COFFObjectFile(Object, EC)); if (EC) return EC; - return Ret.release(); + return std::move(Ret); +} + +bool BaseRelocRef::operator==(const BaseRelocRef &Other) const { + return Header == Other.Header && Index == Other.Index; +} + +void BaseRelocRef::moveNext() { + // Header->BlockSize is the size of the current block, including the + // size of the header itself. + uint32_t Size = sizeof(*Header) + + sizeof(coff_base_reloc_block_entry) * (Index + 1); + if (Size == Header->BlockSize) { + // .reloc contains a list of base relocation blocks. Each block + // consists of the header followed by entries. The header contains + // how many entories will follow. When we reach the end of the + // current block, proceed to the next block. + Header = reinterpret_cast<const coff_base_reloc_block_header *>( + reinterpret_cast<const uint8_t *>(Header) + Size); + Index = 0; + } else { + ++Index; + } +} + +std::error_code BaseRelocRef::getType(uint8_t &Type) const { + auto *Entry = reinterpret_cast<const coff_base_reloc_block_entry *>(Header + 1); + Type = Entry[Index].getType(); + return object_error::success; +} + +std::error_code BaseRelocRef::getRVA(uint32_t &Result) const { + auto *Entry = reinterpret_cast<const coff_base_reloc_block_entry *>(Header + 1); + Result = Header->PageRVA + Entry[Index].getOffset(); + return object_error::success; } |