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Diffstat (limited to 'lld/COFF/Librarian.cpp')
| -rw-r--r-- | lld/COFF/Librarian.cpp | 511 |
1 files changed, 0 insertions, 511 deletions
diff --git a/lld/COFF/Librarian.cpp b/lld/COFF/Librarian.cpp deleted file mode 100644 index 91316ee6b0c..00000000000 --- a/lld/COFF/Librarian.cpp +++ /dev/null @@ -1,511 +0,0 @@ -//===- Librarian.cpp ------------------------------------------------------===// -// -// The LLVM Linker -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file contains functions for the Librarian. The librarian creates and -// manages libraries of the Common Object File Format (COFF) object files. It -// primarily is used for creating static libraries and import libraries. -// -//===----------------------------------------------------------------------===// - -#include "Config.h" -#include "Driver.h" -#include "Error.h" -#include "Symbols.h" -#include "llvm/Object/Archive.h" -#include "llvm/Object/ArchiveWriter.h" -#include "llvm/Object/COFF.h" -#include "llvm/Support/Path.h" - -#include <vector> - -using namespace lld::coff; -using namespace llvm::COFF; -using namespace llvm::object; -using namespace llvm; - -static bool is32bit() { - switch (Config->Machine) { - default: - llvm_unreachable("unsupported machine"); - case IMAGE_FILE_MACHINE_AMD64: - return false; - case IMAGE_FILE_MACHINE_ARMNT: - case IMAGE_FILE_MACHINE_I386: - return true; - } -} - -static uint16_t getImgRelRelocation() { - switch (Config->Machine) { - default: - llvm_unreachable("unsupported machine"); - case IMAGE_FILE_MACHINE_AMD64: - return IMAGE_REL_AMD64_ADDR32NB; - case IMAGE_FILE_MACHINE_ARMNT: - return IMAGE_REL_ARM_ADDR32NB; - case IMAGE_FILE_MACHINE_I386: - return IMAGE_REL_I386_DIR32NB; - } -} - -template <class T> static void append(std::vector<uint8_t> &B, const T &Data) { - size_t S = B.size(); - B.resize(S + sizeof(T)); - memcpy(&B[S], &Data, sizeof(T)); -} - -static void writeStringTable(std::vector<uint8_t> &B, - ArrayRef<const std::string> Strings) { - // The COFF string table consists of a 4-byte value which is the size of the - // table, including the length field itself. This value is followed by the - // string content itself, which is an array of null-terminated C-style - // strings. The termination is important as they are referenced to by offset - // by the symbol entity in the file format. - - std::vector<uint8_t>::size_type Pos = B.size(); - std::vector<uint8_t>::size_type Offset = B.size(); - - // Skip over the length field, we will fill it in later as we will have - // computed the length while emitting the string content itself. - Pos += sizeof(uint32_t); - - for (const auto &S : Strings) { - B.resize(Pos + S.length() + 1); - strcpy(reinterpret_cast<char *>(&B[Pos]), S.c_str()); - Pos += S.length() + 1; - } - - // Backfill the length of the table now that it has been computed. - support::ulittle32_t Length(B.size() - Offset); - memcpy(&B[Offset], &Length, sizeof(Length)); -} - -static std::string getImplibPath() { - if (!Config->Implib.empty()) - return Config->Implib; - SmallString<128> Out = StringRef(Config->OutputFile); - sys::path::replace_extension(Out, ".lib"); - return Out.str(); -} - -static ImportNameType getNameType(StringRef Sym, StringRef ExtName) { - if (Sym != ExtName) - return IMPORT_NAME_UNDECORATE; - if (Config->Machine == I386 && Sym.startswith("_")) - return IMPORT_NAME_NOPREFIX; - return IMPORT_NAME; -} - -static std::string replace(StringRef S, StringRef From, StringRef To) { - size_t Pos = S.find(From); - - // From and To may be mangled, but substrings in S may not. - if (Pos == StringRef::npos && From.startswith("_") && To.startswith("_")) { - From = From.substr(1); - To = To.substr(1); - Pos = S.find(From); - } - - if (Pos == StringRef::npos) { - error(S + ": replacing '" + From + "' with '" + To + "' failed"); - return ""; - } - return (Twine(S.substr(0, Pos)) + To + S.substr(Pos + From.size())).str(); -} - -static const std::string NullImportDescriptorSymbolName = - "__NULL_IMPORT_DESCRIPTOR"; - -namespace { -// This class constructs various small object files necessary to support linking -// symbols imported from a DLL. The contents are pretty strictly defined and -// nearly entirely static. The details of the structures files are defined in -// WINNT.h and the PE/COFF specification. -class ObjectFactory { - using u16 = support::ulittle16_t; - using u32 = support::ulittle32_t; - - BumpPtrAllocator Alloc; - StringRef DLLName; - StringRef Library; - std::string ImportDescriptorSymbolName; - std::string NullThunkSymbolName; - -public: - ObjectFactory(StringRef S) - : DLLName(S), Library(S.drop_back(4)), - ImportDescriptorSymbolName(("__IMPORT_DESCRIPTOR_" + Library).str()), - NullThunkSymbolName(("\x7f" + Library + "_NULL_THUNK_DATA").str()) {} - - // Creates an Import Descriptor. This is a small object file which contains a - // reference to the terminators and contains the library name (entry) for the - // import name table. It will force the linker to construct the necessary - // structure to import symbols from the DLL. - NewArchiveMember createImportDescriptor(std::vector<uint8_t> &Buffer); - - // Creates a NULL import descriptor. This is a small object file whcih - // contains a NULL import descriptor. It is used to terminate the imports - // from a specific DLL. - NewArchiveMember createNullImportDescriptor(std::vector<uint8_t> &Buffer); - - // Create a NULL Thunk Entry. This is a small object file which contains a - // NULL Import Address Table entry and a NULL Import Lookup Table Entry. It - // is used to terminate the IAT and ILT. - NewArchiveMember createNullThunk(std::vector<uint8_t> &Buffer); - - // Create a short import file which is described in PE/COFF spec 7. Import - // Library Format. - NewArchiveMember createShortImport(StringRef Sym, uint16_t Ordinal, - ImportType Type, ImportNameType NameType); -}; -} - -NewArchiveMember -ObjectFactory::createImportDescriptor(std::vector<uint8_t> &Buffer) { - static const uint32_t NumberOfSections = 2; - static const uint32_t NumberOfSymbols = 7; - static const uint32_t NumberOfRelocations = 3; - - // COFF Header - coff_file_header Header{ - u16(Config->Machine), u16(NumberOfSections), u32(0), - u32(sizeof(Header) + (NumberOfSections * sizeof(coff_section)) + - // .idata$2 - sizeof(coff_import_directory_table_entry) + - NumberOfRelocations * sizeof(coff_relocation) + - // .idata$4 - (DLLName.size() + 1)), - u32(NumberOfSymbols), u16(0), - u16(is32bit() ? IMAGE_FILE_32BIT_MACHINE : 0), - }; - append(Buffer, Header); - - // Section Header Table - static const coff_section SectionTable[NumberOfSections] = { - {{'.', 'i', 'd', 'a', 't', 'a', '$', '2'}, - u32(0), - u32(0), - u32(sizeof(coff_import_directory_table_entry)), - u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section)), - u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section) + - sizeof(coff_import_directory_table_entry)), - u32(0), - u16(NumberOfRelocations), - u16(0), - u32(IMAGE_SCN_ALIGN_4BYTES | IMAGE_SCN_CNT_INITIALIZED_DATA | - IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE)}, - {{'.', 'i', 'd', 'a', 't', 'a', '$', '6'}, - u32(0), - u32(0), - u32(DLLName.size() + 1), - u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section) + - sizeof(coff_import_directory_table_entry) + - NumberOfRelocations * sizeof(coff_relocation)), - u32(0), - u32(0), - u16(0), - u16(0), - u32(IMAGE_SCN_ALIGN_2BYTES | IMAGE_SCN_CNT_INITIALIZED_DATA | - IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE)}, - }; - append(Buffer, SectionTable); - - // .idata$2 - static const coff_import_directory_table_entry ImportDescriptor{ - u32(0), u32(0), u32(0), u32(0), u32(0), - }; - append(Buffer, ImportDescriptor); - - static const coff_relocation RelocationTable[NumberOfRelocations] = { - {u32(offsetof(coff_import_directory_table_entry, NameRVA)), u32(2), - u16(getImgRelRelocation())}, - {u32(offsetof(coff_import_directory_table_entry, ImportLookupTableRVA)), - u32(3), u16(getImgRelRelocation())}, - {u32(offsetof(coff_import_directory_table_entry, ImportAddressTableRVA)), - u32(4), u16(getImgRelRelocation())}, - }; - append(Buffer, RelocationTable); - - // .idata$6 - auto S = Buffer.size(); - Buffer.resize(S + DLLName.size() + 1); - memcpy(&Buffer[S], DLLName.data(), DLLName.size()); - Buffer[S + DLLName.size()] = '\0'; - - // Symbol Table - coff_symbol16 SymbolTable[NumberOfSymbols] = { - {{{0, 0, 0, 0, 0, 0, 0, 0}}, - u32(0), - u16(1), - u16(0), - IMAGE_SYM_CLASS_EXTERNAL, - 0}, - {{{'.', 'i', 'd', 'a', 't', 'a', '$', '2'}}, - u32(0), - u16(1), - u16(0), - IMAGE_SYM_CLASS_SECTION, - 0}, - {{{'.', 'i', 'd', 'a', 't', 'a', '$', '6'}}, - u32(0), - u16(2), - u16(0), - IMAGE_SYM_CLASS_STATIC, - 0}, - {{{'.', 'i', 'd', 'a', 't', 'a', '$', '4'}}, - u32(0), - u16(0), - u16(0), - IMAGE_SYM_CLASS_SECTION, - 0}, - {{{'.', 'i', 'd', 'a', 't', 'a', '$', '5'}}, - u32(0), - u16(0), - u16(0), - IMAGE_SYM_CLASS_SECTION, - 0}, - {{{0, 0, 0, 0, 0, 0, 0, 0}}, - u32(0), - u16(0), - u16(0), - IMAGE_SYM_CLASS_EXTERNAL, - 0}, - {{{0, 0, 0, 0, 0, 0, 0, 0}}, - u32(0), - u16(0), - u16(0), - IMAGE_SYM_CLASS_EXTERNAL, - 0}, - }; - reinterpret_cast<StringTableOffset &>(SymbolTable[0].Name).Offset = - sizeof(uint32_t); - reinterpret_cast<StringTableOffset &>(SymbolTable[5].Name).Offset = - sizeof(uint32_t) + ImportDescriptorSymbolName.length() + 1; - reinterpret_cast<StringTableOffset &>(SymbolTable[6].Name).Offset = - sizeof(uint32_t) + ImportDescriptorSymbolName.length() + 1 + - NullImportDescriptorSymbolName.length() + 1; - append(Buffer, SymbolTable); - - // String Table - writeStringTable(Buffer, - {ImportDescriptorSymbolName, NullImportDescriptorSymbolName, - NullThunkSymbolName}); - - StringRef F{reinterpret_cast<const char *>(Buffer.data()), Buffer.size()}; - return {MemoryBufferRef(F, DLLName)}; -} - -NewArchiveMember -ObjectFactory::createNullImportDescriptor(std::vector<uint8_t> &Buffer) { - static const uint32_t NumberOfSections = 1; - static const uint32_t NumberOfSymbols = 1; - - // COFF Header - coff_file_header Header{ - u16(Config->Machine), u16(NumberOfSections), u32(0), - u32(sizeof(Header) + (NumberOfSections * sizeof(coff_section)) + - // .idata$3 - sizeof(coff_import_directory_table_entry)), - u32(NumberOfSymbols), u16(0), - u16(is32bit() ? IMAGE_FILE_32BIT_MACHINE : 0), - }; - append(Buffer, Header); - - // Section Header Table - static const coff_section SectionTable[NumberOfSections] = { - {{'.', 'i', 'd', 'a', 't', 'a', '$', '3'}, - u32(0), - u32(0), - u32(sizeof(coff_import_directory_table_entry)), - u32(sizeof(coff_file_header) + - (NumberOfSections * sizeof(coff_section))), - u32(0), - u32(0), - u16(0), - u16(0), - u32(IMAGE_SCN_ALIGN_4BYTES | IMAGE_SCN_CNT_INITIALIZED_DATA | - IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE)}, - }; - append(Buffer, SectionTable); - - // .idata$3 - static const coff_import_directory_table_entry ImportDescriptor{ - u32(0), u32(0), u32(0), u32(0), u32(0), - }; - append(Buffer, ImportDescriptor); - - // Symbol Table - coff_symbol16 SymbolTable[NumberOfSymbols] = { - {{{0, 0, 0, 0, 0, 0, 0, 0}}, - u32(0), - u16(1), - u16(0), - IMAGE_SYM_CLASS_EXTERNAL, - 0}, - }; - reinterpret_cast<StringTableOffset &>(SymbolTable[0].Name).Offset = - sizeof(uint32_t); - append(Buffer, SymbolTable); - - // String Table - writeStringTable(Buffer, {NullImportDescriptorSymbolName}); - - StringRef F{reinterpret_cast<const char *>(Buffer.data()), Buffer.size()}; - return {MemoryBufferRef(F, DLLName)}; -} - -NewArchiveMember ObjectFactory::createNullThunk(std::vector<uint8_t> &Buffer) { - static const uint32_t NumberOfSections = 2; - static const uint32_t NumberOfSymbols = 1; - uint32_t VASize = is32bit() ? 4 : 8; - - // COFF Header - coff_file_header Header{ - u16(Config->Machine), u16(NumberOfSections), u32(0), - u32(sizeof(Header) + (NumberOfSections * sizeof(coff_section)) + - // .idata$5 - VASize + - // .idata$4 - VASize), - u32(NumberOfSymbols), u16(0), - u16(is32bit() ? IMAGE_FILE_32BIT_MACHINE : 0), - }; - append(Buffer, Header); - - // Section Header Table - static const coff_section SectionTable[NumberOfSections] = { - {{'.', 'i', 'd', 'a', 't', 'a', '$', '5'}, - u32(0), - u32(0), - u32(VASize), - u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section)), - u32(0), - u32(0), - u16(0), - u16(0), - u32((is32bit() ? IMAGE_SCN_ALIGN_4BYTES : IMAGE_SCN_ALIGN_8BYTES) | - IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | - IMAGE_SCN_MEM_WRITE)}, - {{'.', 'i', 'd', 'a', 't', 'a', '$', '4'}, - u32(0), - u32(0), - u32(VASize), - u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section) + - VASize), - u32(0), - u32(0), - u16(0), - u16(0), - u32((is32bit() ? IMAGE_SCN_ALIGN_4BYTES : IMAGE_SCN_ALIGN_8BYTES) | - IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | - IMAGE_SCN_MEM_WRITE)}, - }; - append(Buffer, SectionTable); - - // .idata$5, ILT - append(Buffer, u32(0)); - if (!is32bit()) - append(Buffer, u32(0)); - - // .idata$4, IAT - append(Buffer, u32(0)); - if (!is32bit()) - append(Buffer, u32(0)); - - // Symbol Table - coff_symbol16 SymbolTable[NumberOfSymbols] = { - {{{0, 0, 0, 0, 0, 0, 0, 0}}, - u32(0), - u16(1), - u16(0), - IMAGE_SYM_CLASS_EXTERNAL, - 0}, - }; - reinterpret_cast<StringTableOffset &>(SymbolTable[0].Name).Offset = - sizeof(uint32_t); - append(Buffer, SymbolTable); - - // String Table - writeStringTable(Buffer, {NullThunkSymbolName}); - - StringRef F{reinterpret_cast<const char *>(Buffer.data()), Buffer.size()}; - return {MemoryBufferRef{F, DLLName}}; -} - -NewArchiveMember ObjectFactory::createShortImport(StringRef Sym, - uint16_t Ordinal, - ImportType ImportType, - ImportNameType NameType) { - size_t ImpSize = DLLName.size() + Sym.size() + 2; // +2 for NULs - size_t Size = sizeof(coff_import_header) + ImpSize; - char *Buf = Alloc.Allocate<char>(Size); - memset(Buf, 0, Size); - char *P = Buf; - - // Write short import library. - auto *Imp = reinterpret_cast<coff_import_header *>(P); - P += sizeof(*Imp); - Imp->Sig2 = 0xFFFF; - Imp->Machine = Config->Machine; - Imp->SizeOfData = ImpSize; - if (Ordinal > 0) - Imp->OrdinalHint = Ordinal; - Imp->TypeInfo = (NameType << 2) | ImportType; - - // Write symbol name and DLL name. - memcpy(P, Sym.data(), Sym.size()); - P += Sym.size() + 1; - memcpy(P, DLLName.data(), DLLName.size()); - - return {MemoryBufferRef(StringRef(Buf, Size), DLLName)}; -} - -// Creates an import library for a DLL. In this function, we first -// create an empty import library using lib.exe and then adds short -// import files to that file. -void lld::coff::writeImportLibrary() { - std::vector<NewArchiveMember> Members; - - std::string Path = getImplibPath(); - std::string DLLName = sys::path::filename(Config->OutputFile); - ObjectFactory OF(DLLName); - - std::vector<uint8_t> ImportDescriptor; - Members.push_back(OF.createImportDescriptor(ImportDescriptor)); - - std::vector<uint8_t> NullImportDescriptor; - Members.push_back(OF.createNullImportDescriptor(NullImportDescriptor)); - - std::vector<uint8_t> NullThunk; - Members.push_back(OF.createNullThunk(NullThunk)); - - for (Export &E : Config->Exports) { - if (E.Private) - continue; - - ImportType ImportType = IMPORT_CODE; - if (E.Data) - ImportType = IMPORT_DATA; - if (E.Constant) - ImportType = IMPORT_CONST; - - ImportNameType NameType = getNameType(E.SymbolName, E.Name); - std::string Name = E.ExtName.empty() - ? std::string(E.SymbolName) - : replace(E.SymbolName, E.Name, E.ExtName); - Members.push_back(OF.createShortImport(Name, E.Ordinal, ImportType, - NameType)); - } - - std::pair<StringRef, std::error_code> Result = - writeArchive(Path, Members, /*WriteSymtab*/ true, object::Archive::K_GNU, - /*Deterministic*/ true, /*Thin*/ false); - if (auto EC = Result.second) - fatal(EC, "failed to write " + Path); -} |
