626 lines
20 KiB
C++
626 lines
20 KiB
C++
//===- COFFImportFile.cpp - COFF short import file implementation ---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the writeImportLibrary function.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/COFFImportFile.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Object/ArchiveWriter.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/Path.h"
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#include <cstdint>
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#include <string>
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#include <vector>
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using namespace llvm::COFF;
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using namespace llvm::object;
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using namespace llvm;
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namespace llvm {
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namespace object {
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static bool is32bit(MachineTypes Machine) {
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switch (Machine) {
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default:
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llvm_unreachable("unsupported machine");
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case IMAGE_FILE_MACHINE_ARM64:
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case IMAGE_FILE_MACHINE_AMD64:
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return false;
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case IMAGE_FILE_MACHINE_ARMNT:
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case IMAGE_FILE_MACHINE_I386:
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return true;
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}
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}
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static uint16_t getImgRelRelocation(MachineTypes Machine) {
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switch (Machine) {
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default:
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llvm_unreachable("unsupported machine");
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case IMAGE_FILE_MACHINE_AMD64:
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return IMAGE_REL_AMD64_ADDR32NB;
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case IMAGE_FILE_MACHINE_ARMNT:
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return IMAGE_REL_ARM_ADDR32NB;
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case IMAGE_FILE_MACHINE_ARM64:
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return IMAGE_REL_ARM64_ADDR32NB;
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case IMAGE_FILE_MACHINE_I386:
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return IMAGE_REL_I386_DIR32NB;
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}
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}
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template <class T> static void append(std::vector<uint8_t> &B, const T &Data) {
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size_t S = B.size();
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B.resize(S + sizeof(T));
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memcpy(&B[S], &Data, sizeof(T));
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}
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static void writeStringTable(std::vector<uint8_t> &B,
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ArrayRef<const std::string> Strings) {
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// The COFF string table consists of a 4-byte value which is the size of the
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// table, including the length field itself. This value is followed by the
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// string content itself, which is an array of null-terminated C-style
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// strings. The termination is important as they are referenced to by offset
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// by the symbol entity in the file format.
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size_t Pos = B.size();
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size_t Offset = B.size();
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// Skip over the length field, we will fill it in later as we will have
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// computed the length while emitting the string content itself.
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Pos += sizeof(uint32_t);
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for (const auto &S : Strings) {
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B.resize(Pos + S.length() + 1);
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strcpy(reinterpret_cast<char *>(&B[Pos]), S.c_str());
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Pos += S.length() + 1;
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}
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// Backfill the length of the table now that it has been computed.
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support::ulittle32_t Length(B.size() - Offset);
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support::endian::write32le(&B[Offset], Length);
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}
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static ImportNameType getNameType(StringRef Sym, StringRef ExtName,
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MachineTypes Machine, bool MinGW) {
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// A decorated stdcall function in MSVC is exported with the
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// type IMPORT_NAME, and the exported function name includes the
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// the leading underscore. In MinGW on the other hand, a decorated
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// stdcall function still omits the underscore (IMPORT_NAME_NOPREFIX).
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// See the comment in isDecorated in COFFModuleDefinition.cpp for more
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// details.
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if (ExtName.startswith("_") && ExtName.contains('@') && !MinGW)
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return IMPORT_NAME;
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if (Sym != ExtName)
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return IMPORT_NAME_UNDECORATE;
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if (Machine == IMAGE_FILE_MACHINE_I386 && Sym.startswith("_"))
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return IMPORT_NAME_NOPREFIX;
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return IMPORT_NAME;
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}
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static Expected<std::string> replace(StringRef S, StringRef From,
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StringRef To) {
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size_t Pos = S.find(From);
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// From and To may be mangled, but substrings in S may not.
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if (Pos == StringRef::npos && From.startswith("_") && To.startswith("_")) {
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From = From.substr(1);
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To = To.substr(1);
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Pos = S.find(From);
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}
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if (Pos == StringRef::npos) {
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return make_error<StringError>(
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StringRef(Twine(S + ": replacing '" + From +
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"' with '" + To + "' failed").str()), object_error::parse_failed);
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}
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return (Twine(S.substr(0, Pos)) + To + S.substr(Pos + From.size())).str();
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}
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static const std::string NullImportDescriptorSymbolName =
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"__NULL_IMPORT_DESCRIPTOR";
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namespace {
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// This class constructs various small object files necessary to support linking
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// symbols imported from a DLL. The contents are pretty strictly defined and
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// nearly entirely static. The details of the structures files are defined in
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// WINNT.h and the PE/COFF specification.
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class ObjectFactory {
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using u16 = support::ulittle16_t;
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using u32 = support::ulittle32_t;
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MachineTypes Machine;
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BumpPtrAllocator Alloc;
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StringRef ImportName;
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StringRef Library;
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std::string ImportDescriptorSymbolName;
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std::string NullThunkSymbolName;
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public:
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ObjectFactory(StringRef S, MachineTypes M)
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: Machine(M), ImportName(S), Library(S.drop_back(4)),
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ImportDescriptorSymbolName(("__IMPORT_DESCRIPTOR_" + Library).str()),
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NullThunkSymbolName(("\x7f" + Library + "_NULL_THUNK_DATA").str()) {}
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// Creates an Import Descriptor. This is a small object file which contains a
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// reference to the terminators and contains the library name (entry) for the
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// import name table. It will force the linker to construct the necessary
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// structure to import symbols from the DLL.
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NewArchiveMember createImportDescriptor(std::vector<uint8_t> &Buffer);
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// Creates a NULL import descriptor. This is a small object file whcih
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// contains a NULL import descriptor. It is used to terminate the imports
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// from a specific DLL.
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NewArchiveMember createNullImportDescriptor(std::vector<uint8_t> &Buffer);
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// Create a NULL Thunk Entry. This is a small object file which contains a
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// NULL Import Address Table entry and a NULL Import Lookup Table Entry. It
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// is used to terminate the IAT and ILT.
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NewArchiveMember createNullThunk(std::vector<uint8_t> &Buffer);
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// Create a short import file which is described in PE/COFF spec 7. Import
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// Library Format.
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NewArchiveMember createShortImport(StringRef Sym, uint16_t Ordinal,
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ImportType Type, ImportNameType NameType);
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// Create a weak external file which is described in PE/COFF Aux Format 3.
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NewArchiveMember createWeakExternal(StringRef Sym, StringRef Weak, bool Imp);
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};
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} // namespace
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NewArchiveMember
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ObjectFactory::createImportDescriptor(std::vector<uint8_t> &Buffer) {
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const uint32_t NumberOfSections = 2;
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const uint32_t NumberOfSymbols = 7;
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const uint32_t NumberOfRelocations = 3;
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// COFF Header
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coff_file_header Header{
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u16(Machine),
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u16(NumberOfSections),
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u32(0),
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u32(sizeof(Header) + (NumberOfSections * sizeof(coff_section)) +
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// .idata$2
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sizeof(coff_import_directory_table_entry) +
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NumberOfRelocations * sizeof(coff_relocation) +
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// .idata$4
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(ImportName.size() + 1)),
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u32(NumberOfSymbols),
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u16(0),
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u16(is32bit(Machine) ? IMAGE_FILE_32BIT_MACHINE : C_Invalid),
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};
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append(Buffer, Header);
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// Section Header Table
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const coff_section SectionTable[NumberOfSections] = {
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{{'.', 'i', 'd', 'a', 't', 'a', '$', '2'},
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u32(0),
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u32(0),
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u32(sizeof(coff_import_directory_table_entry)),
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u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section)),
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u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section) +
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sizeof(coff_import_directory_table_entry)),
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u32(0),
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u16(NumberOfRelocations),
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u16(0),
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u32(IMAGE_SCN_ALIGN_4BYTES | IMAGE_SCN_CNT_INITIALIZED_DATA |
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IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE)},
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{{'.', 'i', 'd', 'a', 't', 'a', '$', '6'},
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u32(0),
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u32(0),
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u32(ImportName.size() + 1),
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u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section) +
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sizeof(coff_import_directory_table_entry) +
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NumberOfRelocations * sizeof(coff_relocation)),
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u32(0),
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u32(0),
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u16(0),
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u16(0),
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u32(IMAGE_SCN_ALIGN_2BYTES | IMAGE_SCN_CNT_INITIALIZED_DATA |
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IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE)},
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};
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append(Buffer, SectionTable);
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// .idata$2
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const coff_import_directory_table_entry ImportDescriptor{
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u32(0), u32(0), u32(0), u32(0), u32(0),
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};
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append(Buffer, ImportDescriptor);
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const coff_relocation RelocationTable[NumberOfRelocations] = {
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{u32(offsetof(coff_import_directory_table_entry, NameRVA)), u32(2),
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u16(getImgRelRelocation(Machine))},
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{u32(offsetof(coff_import_directory_table_entry, ImportLookupTableRVA)),
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u32(3), u16(getImgRelRelocation(Machine))},
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{u32(offsetof(coff_import_directory_table_entry, ImportAddressTableRVA)),
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u32(4), u16(getImgRelRelocation(Machine))},
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};
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append(Buffer, RelocationTable);
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// .idata$6
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auto S = Buffer.size();
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Buffer.resize(S + ImportName.size() + 1);
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memcpy(&Buffer[S], ImportName.data(), ImportName.size());
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Buffer[S + ImportName.size()] = '\0';
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// Symbol Table
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coff_symbol16 SymbolTable[NumberOfSymbols] = {
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{{{0, 0, 0, 0, 0, 0, 0, 0}},
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u32(0),
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u16(1),
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u16(0),
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IMAGE_SYM_CLASS_EXTERNAL,
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0},
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{{{'.', 'i', 'd', 'a', 't', 'a', '$', '2'}},
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u32(0),
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u16(1),
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u16(0),
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IMAGE_SYM_CLASS_SECTION,
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0},
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{{{'.', 'i', 'd', 'a', 't', 'a', '$', '6'}},
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u32(0),
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u16(2),
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u16(0),
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IMAGE_SYM_CLASS_STATIC,
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0},
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{{{'.', 'i', 'd', 'a', 't', 'a', '$', '4'}},
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u32(0),
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u16(0),
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u16(0),
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IMAGE_SYM_CLASS_SECTION,
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0},
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{{{'.', 'i', 'd', 'a', 't', 'a', '$', '5'}},
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u32(0),
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u16(0),
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u16(0),
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IMAGE_SYM_CLASS_SECTION,
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0},
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{{{0, 0, 0, 0, 0, 0, 0, 0}},
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u32(0),
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u16(0),
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u16(0),
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IMAGE_SYM_CLASS_EXTERNAL,
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0},
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{{{0, 0, 0, 0, 0, 0, 0, 0}},
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u32(0),
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u16(0),
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u16(0),
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IMAGE_SYM_CLASS_EXTERNAL,
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0},
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};
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// TODO: Name.Offset.Offset here and in the all similar places below
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// suggests a names refactoring. Maybe StringTableOffset.Value?
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SymbolTable[0].Name.Offset.Offset =
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sizeof(uint32_t);
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SymbolTable[5].Name.Offset.Offset =
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sizeof(uint32_t) + ImportDescriptorSymbolName.length() + 1;
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SymbolTable[6].Name.Offset.Offset =
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sizeof(uint32_t) + ImportDescriptorSymbolName.length() + 1 +
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NullImportDescriptorSymbolName.length() + 1;
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append(Buffer, SymbolTable);
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// String Table
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writeStringTable(Buffer,
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{ImportDescriptorSymbolName, NullImportDescriptorSymbolName,
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NullThunkSymbolName});
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StringRef F{reinterpret_cast<const char *>(Buffer.data()), Buffer.size()};
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return {MemoryBufferRef(F, ImportName)};
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}
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NewArchiveMember
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ObjectFactory::createNullImportDescriptor(std::vector<uint8_t> &Buffer) {
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const uint32_t NumberOfSections = 1;
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const uint32_t NumberOfSymbols = 1;
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// COFF Header
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coff_file_header Header{
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u16(Machine),
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u16(NumberOfSections),
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u32(0),
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u32(sizeof(Header) + (NumberOfSections * sizeof(coff_section)) +
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// .idata$3
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sizeof(coff_import_directory_table_entry)),
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u32(NumberOfSymbols),
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u16(0),
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u16(is32bit(Machine) ? IMAGE_FILE_32BIT_MACHINE : C_Invalid),
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};
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append(Buffer, Header);
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// Section Header Table
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const coff_section SectionTable[NumberOfSections] = {
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{{'.', 'i', 'd', 'a', 't', 'a', '$', '3'},
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u32(0),
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u32(0),
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u32(sizeof(coff_import_directory_table_entry)),
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u32(sizeof(coff_file_header) +
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(NumberOfSections * sizeof(coff_section))),
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u32(0),
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u32(0),
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u16(0),
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u16(0),
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u32(IMAGE_SCN_ALIGN_4BYTES | IMAGE_SCN_CNT_INITIALIZED_DATA |
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IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE)},
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};
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append(Buffer, SectionTable);
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// .idata$3
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const coff_import_directory_table_entry ImportDescriptor{
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u32(0), u32(0), u32(0), u32(0), u32(0),
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};
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append(Buffer, ImportDescriptor);
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// Symbol Table
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coff_symbol16 SymbolTable[NumberOfSymbols] = {
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{{{0, 0, 0, 0, 0, 0, 0, 0}},
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u32(0),
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u16(1),
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u16(0),
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IMAGE_SYM_CLASS_EXTERNAL,
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0},
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};
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SymbolTable[0].Name.Offset.Offset = sizeof(uint32_t);
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append(Buffer, SymbolTable);
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// String Table
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writeStringTable(Buffer, {NullImportDescriptorSymbolName});
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StringRef F{reinterpret_cast<const char *>(Buffer.data()), Buffer.size()};
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return {MemoryBufferRef(F, ImportName)};
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}
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NewArchiveMember ObjectFactory::createNullThunk(std::vector<uint8_t> &Buffer) {
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const uint32_t NumberOfSections = 2;
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const uint32_t NumberOfSymbols = 1;
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uint32_t VASize = is32bit(Machine) ? 4 : 8;
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// COFF Header
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coff_file_header Header{
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u16(Machine),
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u16(NumberOfSections),
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u32(0),
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u32(sizeof(Header) + (NumberOfSections * sizeof(coff_section)) +
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// .idata$5
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VASize +
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// .idata$4
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VASize),
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u32(NumberOfSymbols),
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u16(0),
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u16(is32bit(Machine) ? IMAGE_FILE_32BIT_MACHINE : C_Invalid),
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};
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append(Buffer, Header);
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// Section Header Table
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const coff_section SectionTable[NumberOfSections] = {
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{{'.', 'i', 'd', 'a', 't', 'a', '$', '5'},
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u32(0),
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u32(0),
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u32(VASize),
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u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section)),
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u32(0),
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u32(0),
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u16(0),
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u16(0),
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u32((is32bit(Machine) ? IMAGE_SCN_ALIGN_4BYTES
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: IMAGE_SCN_ALIGN_8BYTES) |
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IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ |
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IMAGE_SCN_MEM_WRITE)},
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{{'.', 'i', 'd', 'a', 't', 'a', '$', '4'},
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u32(0),
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u32(0),
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u32(VASize),
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u32(sizeof(coff_file_header) + NumberOfSections * sizeof(coff_section) +
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VASize),
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u32(0),
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u32(0),
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u16(0),
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u16(0),
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u32((is32bit(Machine) ? IMAGE_SCN_ALIGN_4BYTES
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: IMAGE_SCN_ALIGN_8BYTES) |
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IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ |
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IMAGE_SCN_MEM_WRITE)},
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};
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append(Buffer, SectionTable);
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// .idata$5, ILT
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append(Buffer, u32(0));
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if (!is32bit(Machine))
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append(Buffer, u32(0));
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// .idata$4, IAT
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append(Buffer, u32(0));
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if (!is32bit(Machine))
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append(Buffer, u32(0));
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// Symbol Table
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coff_symbol16 SymbolTable[NumberOfSymbols] = {
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{{{0, 0, 0, 0, 0, 0, 0, 0}},
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u32(0),
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u16(1),
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u16(0),
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IMAGE_SYM_CLASS_EXTERNAL,
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0},
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};
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SymbolTable[0].Name.Offset.Offset = sizeof(uint32_t);
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append(Buffer, SymbolTable);
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// String Table
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writeStringTable(Buffer, {NullThunkSymbolName});
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StringRef F{reinterpret_cast<const char *>(Buffer.data()), Buffer.size()};
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return {MemoryBufferRef{F, ImportName}};
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}
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NewArchiveMember ObjectFactory::createShortImport(StringRef Sym,
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uint16_t Ordinal,
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ImportType ImportType,
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ImportNameType NameType) {
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size_t ImpSize = ImportName.size() + Sym.size() + 2; // +2 for NULs
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size_t Size = sizeof(coff_import_header) + ImpSize;
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char *Buf = Alloc.Allocate<char>(Size);
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memset(Buf, 0, Size);
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char *P = Buf;
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// Write short import library.
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auto *Imp = reinterpret_cast<coff_import_header *>(P);
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P += sizeof(*Imp);
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Imp->Sig2 = 0xFFFF;
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Imp->Machine = 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, ImportName.data(), ImportName.size());
|
|
|
|
return {MemoryBufferRef(StringRef(Buf, Size), ImportName)};
|
|
}
|
|
|
|
NewArchiveMember ObjectFactory::createWeakExternal(StringRef Sym,
|
|
StringRef Weak, bool Imp) {
|
|
std::vector<uint8_t> Buffer;
|
|
const uint32_t NumberOfSections = 1;
|
|
const uint32_t NumberOfSymbols = 5;
|
|
|
|
// COFF Header
|
|
coff_file_header Header{
|
|
u16(Machine),
|
|
u16(NumberOfSections),
|
|
u32(0),
|
|
u32(sizeof(Header) + (NumberOfSections * sizeof(coff_section))),
|
|
u32(NumberOfSymbols),
|
|
u16(0),
|
|
u16(0),
|
|
};
|
|
append(Buffer, Header);
|
|
|
|
// Section Header Table
|
|
const coff_section SectionTable[NumberOfSections] = {
|
|
{{'.', 'd', 'r', 'e', 'c', 't', 'v', 'e'},
|
|
u32(0),
|
|
u32(0),
|
|
u32(0),
|
|
u32(0),
|
|
u32(0),
|
|
u32(0),
|
|
u16(0),
|
|
u16(0),
|
|
u32(IMAGE_SCN_LNK_INFO | IMAGE_SCN_LNK_REMOVE)}};
|
|
append(Buffer, SectionTable);
|
|
|
|
// Symbol Table
|
|
coff_symbol16 SymbolTable[NumberOfSymbols] = {
|
|
{{{'@', 'c', 'o', 'm', 'p', '.', 'i', 'd'}},
|
|
u32(0),
|
|
u16(0xFFFF),
|
|
u16(0),
|
|
IMAGE_SYM_CLASS_STATIC,
|
|
0},
|
|
{{{'@', 'f', 'e', 'a', 't', '.', '0', '0'}},
|
|
u32(0),
|
|
u16(0xFFFF),
|
|
u16(0),
|
|
IMAGE_SYM_CLASS_STATIC,
|
|
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_WEAK_EXTERNAL,
|
|
1},
|
|
{{{2, 0, 0, 0, IMAGE_WEAK_EXTERN_SEARCH_ALIAS, 0, 0, 0}},
|
|
u32(0),
|
|
u16(0),
|
|
u16(0),
|
|
IMAGE_SYM_CLASS_NULL,
|
|
0},
|
|
};
|
|
SymbolTable[2].Name.Offset.Offset = sizeof(uint32_t);
|
|
|
|
//__imp_ String Table
|
|
StringRef Prefix = Imp ? "__imp_" : "";
|
|
SymbolTable[3].Name.Offset.Offset =
|
|
sizeof(uint32_t) + Sym.size() + Prefix.size() + 1;
|
|
append(Buffer, SymbolTable);
|
|
writeStringTable(Buffer, {(Prefix + Sym).str(),
|
|
(Prefix + Weak).str()});
|
|
|
|
// Copied here so we can still use writeStringTable
|
|
char *Buf = Alloc.Allocate<char>(Buffer.size());
|
|
memcpy(Buf, Buffer.data(), Buffer.size());
|
|
return {MemoryBufferRef(StringRef(Buf, Buffer.size()), ImportName)};
|
|
}
|
|
|
|
Error writeImportLibrary(StringRef ImportName, StringRef Path,
|
|
ArrayRef<COFFShortExport> Exports,
|
|
MachineTypes Machine, bool MinGW) {
|
|
|
|
std::vector<NewArchiveMember> Members;
|
|
ObjectFactory OF(llvm::sys::path::filename(ImportName), Machine);
|
|
|
|
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 (COFFShortExport E : Exports) {
|
|
if (E.Private)
|
|
continue;
|
|
|
|
ImportType ImportType = IMPORT_CODE;
|
|
if (E.Data)
|
|
ImportType = IMPORT_DATA;
|
|
if (E.Constant)
|
|
ImportType = IMPORT_CONST;
|
|
|
|
StringRef SymbolName = E.SymbolName.empty() ? E.Name : E.SymbolName;
|
|
ImportNameType NameType = E.Noname
|
|
? IMPORT_ORDINAL
|
|
: getNameType(SymbolName, E.Name,
|
|
Machine, MinGW);
|
|
Expected<std::string> Name = E.ExtName.empty()
|
|
? std::string(SymbolName)
|
|
: replace(SymbolName, E.Name, E.ExtName);
|
|
|
|
if (!Name)
|
|
return Name.takeError();
|
|
|
|
if (!E.AliasTarget.empty() && *Name != E.AliasTarget) {
|
|
Members.push_back(OF.createWeakExternal(E.AliasTarget, *Name, false));
|
|
Members.push_back(OF.createWeakExternal(E.AliasTarget, *Name, true));
|
|
continue;
|
|
}
|
|
|
|
Members.push_back(
|
|
OF.createShortImport(*Name, E.Ordinal, ImportType, NameType));
|
|
}
|
|
|
|
return writeArchive(Path, Members, /*WriteSymtab*/ true,
|
|
object::Archive::K_GNU,
|
|
/*Deterministic*/ true, /*Thin*/ false);
|
|
}
|
|
|
|
} // namespace object
|
|
} // namespace llvm
|