forked from OSchip/llvm-project
1682 lines
55 KiB
C++
1682 lines
55 KiB
C++
//===- Driver.cpp ---------------------------------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "Driver.h"
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#include "Config.h"
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#include "ICF.h"
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#include "InputFiles.h"
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#include "MarkLive.h"
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#include "MinGW.h"
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#include "SymbolTable.h"
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#include "Symbols.h"
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#include "Writer.h"
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#include "lld/Common/Args.h"
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#include "lld/Common/Driver.h"
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#include "lld/Common/ErrorHandler.h"
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#include "lld/Common/Memory.h"
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#include "lld/Common/Timer.h"
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#include "lld/Common/Version.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/BinaryFormat/Magic.h"
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#include "llvm/Object/ArchiveWriter.h"
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#include "llvm/Object/COFFImportFile.h"
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#include "llvm/Object/COFFModuleDefinition.h"
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#include "llvm/Option/Arg.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/Option.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/TarWriter.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ToolDrivers/llvm-lib/LibDriver.h"
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#include <algorithm>
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#include <future>
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#include <memory>
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::COFF;
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using llvm::sys::Process;
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namespace lld {
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namespace coff {
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static Timer InputFileTimer("Input File Reading", Timer::root());
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Configuration *Config;
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LinkerDriver *Driver;
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bool link(ArrayRef<const char *> Args, bool CanExitEarly, raw_ostream &Diag) {
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errorHandler().LogName = args::getFilenameWithoutExe(Args[0]);
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errorHandler().ErrorOS = &Diag;
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errorHandler().ColorDiagnostics = Diag.has_colors();
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errorHandler().ErrorLimitExceededMsg =
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"too many errors emitted, stopping now"
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" (use /errorlimit:0 to see all errors)";
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errorHandler().ExitEarly = CanExitEarly;
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Config = make<Configuration>();
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Symtab = make<SymbolTable>();
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Driver = make<LinkerDriver>();
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Driver->link(Args);
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// Call exit() if we can to avoid calling destructors.
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if (CanExitEarly)
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exitLld(errorCount() ? 1 : 0);
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freeArena();
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ObjFile::Instances.clear();
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ImportFile::Instances.clear();
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BitcodeFile::Instances.clear();
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return !errorCount();
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}
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// Drop directory components and replace extension with ".exe" or ".dll".
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static std::string getOutputPath(StringRef Path) {
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auto P = Path.find_last_of("\\/");
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StringRef S = (P == StringRef::npos) ? Path : Path.substr(P + 1);
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const char* E = Config->DLL ? ".dll" : ".exe";
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return (S.substr(0, S.rfind('.')) + E).str();
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}
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// ErrorOr is not default constructible, so it cannot be used as the type
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// parameter of a future.
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// FIXME: We could open the file in createFutureForFile and avoid needing to
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// return an error here, but for the moment that would cost us a file descriptor
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// (a limited resource on Windows) for the duration that the future is pending.
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typedef std::pair<std::unique_ptr<MemoryBuffer>, std::error_code> MBErrPair;
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// Create a std::future that opens and maps a file using the best strategy for
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// the host platform.
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static std::future<MBErrPair> createFutureForFile(std::string Path) {
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#if _WIN32
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// On Windows, file I/O is relatively slow so it is best to do this
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// asynchronously.
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auto Strategy = std::launch::async;
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#else
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auto Strategy = std::launch::deferred;
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#endif
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return std::async(Strategy, [=]() {
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auto MBOrErr = MemoryBuffer::getFile(Path,
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/*FileSize*/ -1,
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/*RequiresNullTerminator*/ false);
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if (!MBOrErr)
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return MBErrPair{nullptr, MBOrErr.getError()};
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return MBErrPair{std::move(*MBOrErr), std::error_code()};
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});
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}
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// Symbol names are mangled by prepending "_" on x86.
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static StringRef mangle(StringRef Sym) {
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assert(Config->Machine != IMAGE_FILE_MACHINE_UNKNOWN);
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if (Config->Machine == I386)
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return Saver.save("_" + Sym);
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return Sym;
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}
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static bool findUnderscoreMangle(StringRef Sym) {
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StringRef Entry = Symtab->findMangle(mangle(Sym));
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return !Entry.empty() && !isa<Undefined>(Symtab->find(Entry));
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}
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MemoryBufferRef LinkerDriver::takeBuffer(std::unique_ptr<MemoryBuffer> MB) {
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MemoryBufferRef MBRef = *MB;
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make<std::unique_ptr<MemoryBuffer>>(std::move(MB)); // take ownership
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if (Driver->Tar)
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Driver->Tar->append(relativeToRoot(MBRef.getBufferIdentifier()),
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MBRef.getBuffer());
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return MBRef;
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}
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void LinkerDriver::addBuffer(std::unique_ptr<MemoryBuffer> MB,
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bool WholeArchive) {
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StringRef Filename = MB->getBufferIdentifier();
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MemoryBufferRef MBRef = takeBuffer(std::move(MB));
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FilePaths.push_back(Filename);
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// File type is detected by contents, not by file extension.
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switch (identify_magic(MBRef.getBuffer())) {
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case file_magic::windows_resource:
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Resources.push_back(MBRef);
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break;
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case file_magic::archive:
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if (WholeArchive) {
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std::unique_ptr<Archive> File =
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CHECK(Archive::create(MBRef), Filename + ": failed to parse archive");
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for (MemoryBufferRef M : getArchiveMembers(File.get()))
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addArchiveBuffer(M, "<whole-archive>", Filename);
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return;
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}
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Symtab->addFile(make<ArchiveFile>(MBRef));
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break;
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case file_magic::bitcode:
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Symtab->addFile(make<BitcodeFile>(MBRef));
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break;
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case file_magic::coff_object:
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case file_magic::coff_import_library:
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Symtab->addFile(make<ObjFile>(MBRef));
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break;
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case file_magic::coff_cl_gl_object:
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error(Filename + ": is not a native COFF file. Recompile without /GL");
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break;
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case file_magic::pecoff_executable:
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if (Filename.endswith_lower(".dll")) {
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error(Filename + ": bad file type. Did you specify a DLL instead of an "
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"import library?");
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break;
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}
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LLVM_FALLTHROUGH;
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default:
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error(MBRef.getBufferIdentifier() + ": unknown file type");
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break;
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}
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}
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void LinkerDriver::enqueuePath(StringRef Path, bool WholeArchive) {
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auto Future =
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std::make_shared<std::future<MBErrPair>>(createFutureForFile(Path));
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std::string PathStr = Path;
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enqueueTask([=]() {
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auto MBOrErr = Future->get();
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if (MBOrErr.second)
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error("could not open " + PathStr + ": " + MBOrErr.second.message());
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else
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Driver->addBuffer(std::move(MBOrErr.first), WholeArchive);
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});
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}
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void LinkerDriver::addArchiveBuffer(MemoryBufferRef MB, StringRef SymName,
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StringRef ParentName) {
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file_magic Magic = identify_magic(MB.getBuffer());
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if (Magic == file_magic::coff_import_library) {
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Symtab->addFile(make<ImportFile>(MB));
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return;
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}
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InputFile *Obj;
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if (Magic == file_magic::coff_object) {
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Obj = make<ObjFile>(MB);
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} else if (Magic == file_magic::bitcode) {
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Obj = make<BitcodeFile>(MB);
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} else {
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error("unknown file type: " + MB.getBufferIdentifier());
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return;
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}
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Obj->ParentName = ParentName;
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Symtab->addFile(Obj);
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log("Loaded " + toString(Obj) + " for " + SymName);
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}
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void LinkerDriver::enqueueArchiveMember(const Archive::Child &C,
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StringRef SymName,
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StringRef ParentName) {
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if (!C.getParent()->isThin()) {
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MemoryBufferRef MB = CHECK(
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C.getMemoryBufferRef(),
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"could not get the buffer for the member defining symbol " + SymName);
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enqueueTask([=]() { Driver->addArchiveBuffer(MB, SymName, ParentName); });
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return;
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}
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auto Future = std::make_shared<std::future<MBErrPair>>(createFutureForFile(
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CHECK(C.getFullName(),
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"could not get the filename for the member defining symbol " +
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SymName)));
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enqueueTask([=]() {
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auto MBOrErr = Future->get();
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if (MBOrErr.second)
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fatal("could not get the buffer for the member defining " + SymName +
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": " + MBOrErr.second.message());
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Driver->addArchiveBuffer(takeBuffer(std::move(MBOrErr.first)), SymName,
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ParentName);
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});
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}
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static bool isDecorated(StringRef Sym) {
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return Sym.startswith("@") || Sym.contains("@@") || Sym.startswith("?") ||
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(!Config->MinGW && Sym.contains('@'));
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}
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// Parses .drectve section contents and returns a list of files
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// specified by /defaultlib.
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void LinkerDriver::parseDirectives(StringRef S) {
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ArgParser Parser;
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// .drectve is always tokenized using Windows shell rules.
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// /EXPORT: option can appear too many times, processing in fastpath.
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opt::InputArgList Args;
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std::vector<StringRef> Exports;
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std::tie(Args, Exports) = Parser.parseDirectives(S);
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for (StringRef E : Exports) {
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// If a common header file contains dllexported function
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// declarations, many object files may end up with having the
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// same /EXPORT options. In order to save cost of parsing them,
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// we dedup them first.
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if (!DirectivesExports.insert(E).second)
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continue;
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Export Exp = parseExport(E);
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if (Config->Machine == I386 && Config->MinGW) {
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if (!isDecorated(Exp.Name))
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Exp.Name = Saver.save("_" + Exp.Name);
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if (!Exp.ExtName.empty() && !isDecorated(Exp.ExtName))
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Exp.ExtName = Saver.save("_" + Exp.ExtName);
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}
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Exp.Directives = true;
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Config->Exports.push_back(Exp);
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}
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for (auto *Arg : Args) {
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switch (Arg->getOption().getUnaliasedOption().getID()) {
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case OPT_aligncomm:
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parseAligncomm(Arg->getValue());
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break;
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case OPT_alternatename:
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parseAlternateName(Arg->getValue());
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break;
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case OPT_defaultlib:
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if (Optional<StringRef> Path = findLib(Arg->getValue()))
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enqueuePath(*Path, false);
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break;
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case OPT_entry:
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Config->Entry = addUndefined(mangle(Arg->getValue()));
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break;
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case OPT_failifmismatch:
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checkFailIfMismatch(Arg->getValue());
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break;
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case OPT_incl:
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addUndefined(Arg->getValue());
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break;
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case OPT_merge:
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parseMerge(Arg->getValue());
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break;
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case OPT_nodefaultlib:
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Config->NoDefaultLibs.insert(doFindLib(Arg->getValue()));
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break;
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case OPT_section:
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parseSection(Arg->getValue());
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break;
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case OPT_subsystem:
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parseSubsystem(Arg->getValue(), &Config->Subsystem,
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&Config->MajorOSVersion, &Config->MinorOSVersion);
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break;
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case OPT_editandcontinue:
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case OPT_fastfail:
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case OPT_guardsym:
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case OPT_natvis:
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case OPT_throwingnew:
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break;
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default:
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error(Arg->getSpelling() + " is not allowed in .drectve");
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}
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}
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}
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// Find file from search paths. You can omit ".obj", this function takes
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// care of that. Note that the returned path is not guaranteed to exist.
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StringRef LinkerDriver::doFindFile(StringRef Filename) {
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bool HasPathSep = (Filename.find_first_of("/\\") != StringRef::npos);
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if (HasPathSep)
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return Filename;
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bool HasExt = Filename.contains('.');
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for (StringRef Dir : SearchPaths) {
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SmallString<128> Path = Dir;
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sys::path::append(Path, Filename);
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if (sys::fs::exists(Path.str()))
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return Saver.save(Path.str());
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if (!HasExt) {
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Path.append(".obj");
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if (sys::fs::exists(Path.str()))
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return Saver.save(Path.str());
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}
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}
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return Filename;
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}
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static Optional<sys::fs::UniqueID> getUniqueID(StringRef Path) {
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sys::fs::UniqueID Ret;
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if (sys::fs::getUniqueID(Path, Ret))
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return None;
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return Ret;
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}
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// Resolves a file path. This never returns the same path
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// (in that case, it returns None).
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Optional<StringRef> LinkerDriver::findFile(StringRef Filename) {
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StringRef Path = doFindFile(Filename);
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if (Optional<sys::fs::UniqueID> ID = getUniqueID(Path)) {
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bool Seen = !VisitedFiles.insert(*ID).second;
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if (Seen)
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return None;
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}
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if (Path.endswith_lower(".lib"))
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VisitedLibs.insert(sys::path::filename(Path));
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return Path;
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}
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// MinGW specific. If an embedded directive specified to link to
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// foo.lib, but it isn't found, try libfoo.a instead.
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StringRef LinkerDriver::doFindLibMinGW(StringRef Filename) {
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if (Filename.contains('/') || Filename.contains('\\'))
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return Filename;
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SmallString<128> S = Filename;
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sys::path::replace_extension(S, ".a");
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StringRef LibName = Saver.save("lib" + S.str());
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return doFindFile(LibName);
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}
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// Find library file from search path.
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StringRef LinkerDriver::doFindLib(StringRef Filename) {
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// Add ".lib" to Filename if that has no file extension.
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bool HasExt = Filename.contains('.');
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if (!HasExt)
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Filename = Saver.save(Filename + ".lib");
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StringRef Ret = doFindFile(Filename);
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// For MinGW, if the find above didn't turn up anything, try
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// looking for a MinGW formatted library name.
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if (Config->MinGW && Ret == Filename)
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return doFindLibMinGW(Filename);
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return Ret;
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}
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// Resolves a library path. /nodefaultlib options are taken into
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// consideration. This never returns the same path (in that case,
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// it returns None).
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Optional<StringRef> LinkerDriver::findLib(StringRef Filename) {
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if (Config->NoDefaultLibAll)
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return None;
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if (!VisitedLibs.insert(Filename.lower()).second)
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return None;
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StringRef Path = doFindLib(Filename);
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if (Config->NoDefaultLibs.count(Path))
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return None;
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if (Optional<sys::fs::UniqueID> ID = getUniqueID(Path))
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if (!VisitedFiles.insert(*ID).second)
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return None;
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return Path;
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}
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// Parses LIB environment which contains a list of search paths.
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void LinkerDriver::addLibSearchPaths() {
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Optional<std::string> EnvOpt = Process::GetEnv("LIB");
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if (!EnvOpt.hasValue())
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return;
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StringRef Env = Saver.save(*EnvOpt);
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while (!Env.empty()) {
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StringRef Path;
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std::tie(Path, Env) = Env.split(';');
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SearchPaths.push_back(Path);
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}
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}
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Symbol *LinkerDriver::addUndefined(StringRef Name) {
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Symbol *B = Symtab->addUndefined(Name);
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if (!B->IsGCRoot) {
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B->IsGCRoot = true;
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Config->GCRoot.push_back(B);
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}
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return B;
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}
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// Windows specific -- find default entry point name.
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//
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// There are four different entry point functions for Windows executables,
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// each of which corresponds to a user-defined "main" function. This function
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// infers an entry point from a user-defined "main" function.
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StringRef LinkerDriver::findDefaultEntry() {
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assert(Config->Subsystem != IMAGE_SUBSYSTEM_UNKNOWN &&
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"must handle /subsystem before calling this");
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if (Config->MinGW)
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return mangle(Config->Subsystem == IMAGE_SUBSYSTEM_WINDOWS_GUI
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? "WinMainCRTStartup"
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: "mainCRTStartup");
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if (Config->Subsystem == IMAGE_SUBSYSTEM_WINDOWS_GUI) {
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if (findUnderscoreMangle("wWinMain")) {
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if (!findUnderscoreMangle("WinMain"))
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return mangle("wWinMainCRTStartup");
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warn("found both wWinMain and WinMain; using latter");
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}
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return mangle("WinMainCRTStartup");
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}
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if (findUnderscoreMangle("wmain")) {
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if (!findUnderscoreMangle("main"))
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return mangle("wmainCRTStartup");
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warn("found both wmain and main; using latter");
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}
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return mangle("mainCRTStartup");
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}
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WindowsSubsystem LinkerDriver::inferSubsystem() {
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if (Config->DLL)
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return IMAGE_SUBSYSTEM_WINDOWS_GUI;
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if (Config->MinGW)
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return IMAGE_SUBSYSTEM_WINDOWS_CUI;
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// Note that link.exe infers the subsystem from the presence of these
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// functions even if /entry: or /nodefaultlib are passed which causes them
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// to not be called.
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bool HaveMain = findUnderscoreMangle("main");
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bool HaveWMain = findUnderscoreMangle("wmain");
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bool HaveWinMain = findUnderscoreMangle("WinMain");
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bool HaveWWinMain = findUnderscoreMangle("wWinMain");
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if (HaveMain || HaveWMain) {
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if (HaveWinMain || HaveWWinMain) {
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warn(std::string("found ") + (HaveMain ? "main" : "wmain") + " and " +
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(HaveWinMain ? "WinMain" : "wWinMain") +
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"; defaulting to /subsystem:console");
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}
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return IMAGE_SUBSYSTEM_WINDOWS_CUI;
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}
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if (HaveWinMain || HaveWWinMain)
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return IMAGE_SUBSYSTEM_WINDOWS_GUI;
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return IMAGE_SUBSYSTEM_UNKNOWN;
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}
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static uint64_t getDefaultImageBase() {
|
|
if (Config->is64())
|
|
return Config->DLL ? 0x180000000 : 0x140000000;
|
|
return Config->DLL ? 0x10000000 : 0x400000;
|
|
}
|
|
|
|
static std::string createResponseFile(const opt::InputArgList &Args,
|
|
ArrayRef<StringRef> FilePaths,
|
|
ArrayRef<StringRef> SearchPaths) {
|
|
SmallString<0> Data;
|
|
raw_svector_ostream OS(Data);
|
|
|
|
for (auto *Arg : Args) {
|
|
switch (Arg->getOption().getID()) {
|
|
case OPT_linkrepro:
|
|
case OPT_INPUT:
|
|
case OPT_defaultlib:
|
|
case OPT_libpath:
|
|
case OPT_manifest:
|
|
case OPT_manifest_colon:
|
|
case OPT_manifestdependency:
|
|
case OPT_manifestfile:
|
|
case OPT_manifestinput:
|
|
case OPT_manifestuac:
|
|
break;
|
|
default:
|
|
OS << toString(*Arg) << "\n";
|
|
}
|
|
}
|
|
|
|
for (StringRef Path : SearchPaths) {
|
|
std::string RelPath = relativeToRoot(Path);
|
|
OS << "/libpath:" << quote(RelPath) << "\n";
|
|
}
|
|
|
|
for (StringRef Path : FilePaths)
|
|
OS << quote(relativeToRoot(Path)) << "\n";
|
|
|
|
return Data.str();
|
|
}
|
|
|
|
enum class DebugKind { Unknown, None, Full, FastLink, GHash, Dwarf, Symtab };
|
|
|
|
static DebugKind parseDebugKind(const opt::InputArgList &Args) {
|
|
auto *A = Args.getLastArg(OPT_debug, OPT_debug_opt);
|
|
if (!A)
|
|
return DebugKind::None;
|
|
if (A->getNumValues() == 0)
|
|
return DebugKind::Full;
|
|
|
|
DebugKind Debug = StringSwitch<DebugKind>(A->getValue())
|
|
.CaseLower("none", DebugKind::None)
|
|
.CaseLower("full", DebugKind::Full)
|
|
.CaseLower("fastlink", DebugKind::FastLink)
|
|
// LLD extensions
|
|
.CaseLower("ghash", DebugKind::GHash)
|
|
.CaseLower("dwarf", DebugKind::Dwarf)
|
|
.CaseLower("symtab", DebugKind::Symtab)
|
|
.Default(DebugKind::Unknown);
|
|
|
|
if (Debug == DebugKind::FastLink) {
|
|
warn("/debug:fastlink unsupported; using /debug:full");
|
|
return DebugKind::Full;
|
|
}
|
|
if (Debug == DebugKind::Unknown) {
|
|
error("/debug: unknown option: " + Twine(A->getValue()));
|
|
return DebugKind::None;
|
|
}
|
|
return Debug;
|
|
}
|
|
|
|
static unsigned parseDebugTypes(const opt::InputArgList &Args) {
|
|
unsigned DebugTypes = static_cast<unsigned>(DebugType::None);
|
|
|
|
if (auto *A = Args.getLastArg(OPT_debugtype)) {
|
|
SmallVector<StringRef, 3> Types;
|
|
A->getSpelling().split(Types, ',', /*KeepEmpty=*/false);
|
|
|
|
for (StringRef Type : Types) {
|
|
unsigned V = StringSwitch<unsigned>(Type.lower())
|
|
.Case("cv", static_cast<unsigned>(DebugType::CV))
|
|
.Case("pdata", static_cast<unsigned>(DebugType::PData))
|
|
.Case("fixup", static_cast<unsigned>(DebugType::Fixup))
|
|
.Default(0);
|
|
if (V == 0) {
|
|
warn("/debugtype: unknown option: " + Twine(A->getValue()));
|
|
continue;
|
|
}
|
|
DebugTypes |= V;
|
|
}
|
|
return DebugTypes;
|
|
}
|
|
|
|
// Default debug types
|
|
DebugTypes = static_cast<unsigned>(DebugType::CV);
|
|
if (Args.hasArg(OPT_driver))
|
|
DebugTypes |= static_cast<unsigned>(DebugType::PData);
|
|
if (Args.hasArg(OPT_profile))
|
|
DebugTypes |= static_cast<unsigned>(DebugType::Fixup);
|
|
|
|
return DebugTypes;
|
|
}
|
|
|
|
static std::string getMapFile(const opt::InputArgList &Args) {
|
|
auto *Arg = Args.getLastArg(OPT_lldmap, OPT_lldmap_file);
|
|
if (!Arg)
|
|
return "";
|
|
if (Arg->getOption().getID() == OPT_lldmap_file)
|
|
return Arg->getValue();
|
|
|
|
assert(Arg->getOption().getID() == OPT_lldmap);
|
|
StringRef OutFile = Config->OutputFile;
|
|
return (OutFile.substr(0, OutFile.rfind('.')) + ".map").str();
|
|
}
|
|
|
|
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();
|
|
}
|
|
|
|
//
|
|
// The import name is caculated as the following:
|
|
//
|
|
// | LIBRARY w/ ext | LIBRARY w/o ext | no LIBRARY
|
|
// -----+----------------+---------------------+------------------
|
|
// LINK | {value} | {value}.{.dll/.exe} | {output name}
|
|
// LIB | {value} | {value}.dll | {output name}.dll
|
|
//
|
|
static std::string getImportName(bool AsLib) {
|
|
SmallString<128> Out;
|
|
|
|
if (Config->ImportName.empty()) {
|
|
Out.assign(sys::path::filename(Config->OutputFile));
|
|
if (AsLib)
|
|
sys::path::replace_extension(Out, ".dll");
|
|
} else {
|
|
Out.assign(Config->ImportName);
|
|
if (!sys::path::has_extension(Out))
|
|
sys::path::replace_extension(Out,
|
|
(Config->DLL || AsLib) ? ".dll" : ".exe");
|
|
}
|
|
|
|
return Out.str();
|
|
}
|
|
|
|
static void createImportLibrary(bool AsLib) {
|
|
std::vector<COFFShortExport> Exports;
|
|
for (Export &E1 : Config->Exports) {
|
|
COFFShortExport E2;
|
|
E2.Name = E1.Name;
|
|
E2.SymbolName = E1.SymbolName;
|
|
E2.ExtName = E1.ExtName;
|
|
E2.Ordinal = E1.Ordinal;
|
|
E2.Noname = E1.Noname;
|
|
E2.Data = E1.Data;
|
|
E2.Private = E1.Private;
|
|
E2.Constant = E1.Constant;
|
|
Exports.push_back(E2);
|
|
}
|
|
|
|
auto HandleError = [](Error &&E) {
|
|
handleAllErrors(std::move(E),
|
|
[](ErrorInfoBase &EIB) { error(EIB.message()); });
|
|
};
|
|
std::string LibName = getImportName(AsLib);
|
|
std::string Path = getImplibPath();
|
|
|
|
if (!Config->Incremental) {
|
|
HandleError(writeImportLibrary(LibName, Path, Exports, Config->Machine,
|
|
Config->MinGW));
|
|
return;
|
|
}
|
|
|
|
// If the import library already exists, replace it only if the contents
|
|
// have changed.
|
|
ErrorOr<std::unique_ptr<MemoryBuffer>> OldBuf = MemoryBuffer::getFile(
|
|
Path, /*FileSize*/ -1, /*RequiresNullTerminator*/ false);
|
|
if (!OldBuf) {
|
|
HandleError(writeImportLibrary(LibName, Path, Exports, Config->Machine,
|
|
Config->MinGW));
|
|
return;
|
|
}
|
|
|
|
SmallString<128> TmpName;
|
|
if (std::error_code EC =
|
|
sys::fs::createUniqueFile(Path + ".tmp-%%%%%%%%.lib", TmpName))
|
|
fatal("cannot create temporary file for import library " + Path + ": " +
|
|
EC.message());
|
|
|
|
if (Error E = writeImportLibrary(LibName, TmpName, Exports, Config->Machine,
|
|
Config->MinGW)) {
|
|
HandleError(std::move(E));
|
|
return;
|
|
}
|
|
|
|
std::unique_ptr<MemoryBuffer> NewBuf = check(MemoryBuffer::getFile(
|
|
TmpName, /*FileSize*/ -1, /*RequiresNullTerminator*/ false));
|
|
if ((*OldBuf)->getBuffer() != NewBuf->getBuffer()) {
|
|
OldBuf->reset();
|
|
HandleError(errorCodeToError(sys::fs::rename(TmpName, Path)));
|
|
} else {
|
|
sys::fs::remove(TmpName);
|
|
}
|
|
}
|
|
|
|
static void parseModuleDefs(StringRef Path) {
|
|
std::unique_ptr<MemoryBuffer> MB = CHECK(
|
|
MemoryBuffer::getFile(Path, -1, false, true), "could not open " + Path);
|
|
COFFModuleDefinition M = check(parseCOFFModuleDefinition(
|
|
MB->getMemBufferRef(), Config->Machine, Config->MinGW));
|
|
|
|
if (Config->OutputFile.empty())
|
|
Config->OutputFile = Saver.save(M.OutputFile);
|
|
Config->ImportName = Saver.save(M.ImportName);
|
|
if (M.ImageBase)
|
|
Config->ImageBase = M.ImageBase;
|
|
if (M.StackReserve)
|
|
Config->StackReserve = M.StackReserve;
|
|
if (M.StackCommit)
|
|
Config->StackCommit = M.StackCommit;
|
|
if (M.HeapReserve)
|
|
Config->HeapReserve = M.HeapReserve;
|
|
if (M.HeapCommit)
|
|
Config->HeapCommit = M.HeapCommit;
|
|
if (M.MajorImageVersion)
|
|
Config->MajorImageVersion = M.MajorImageVersion;
|
|
if (M.MinorImageVersion)
|
|
Config->MinorImageVersion = M.MinorImageVersion;
|
|
if (M.MajorOSVersion)
|
|
Config->MajorOSVersion = M.MajorOSVersion;
|
|
if (M.MinorOSVersion)
|
|
Config->MinorOSVersion = M.MinorOSVersion;
|
|
|
|
for (COFFShortExport E1 : M.Exports) {
|
|
Export E2;
|
|
// In simple cases, only Name is set. Renamed exports are parsed
|
|
// and set as "ExtName = Name". If Name has the form "OtherDll.Func",
|
|
// it shouldn't be a normal exported function but a forward to another
|
|
// DLL instead. This is supported by both MS and GNU linkers.
|
|
if (E1.ExtName != E1.Name && StringRef(E1.Name).contains('.')) {
|
|
E2.Name = Saver.save(E1.ExtName);
|
|
E2.ForwardTo = Saver.save(E1.Name);
|
|
Config->Exports.push_back(E2);
|
|
continue;
|
|
}
|
|
E2.Name = Saver.save(E1.Name);
|
|
E2.ExtName = Saver.save(E1.ExtName);
|
|
E2.Ordinal = E1.Ordinal;
|
|
E2.Noname = E1.Noname;
|
|
E2.Data = E1.Data;
|
|
E2.Private = E1.Private;
|
|
E2.Constant = E1.Constant;
|
|
Config->Exports.push_back(E2);
|
|
}
|
|
}
|
|
|
|
void LinkerDriver::enqueueTask(std::function<void()> Task) {
|
|
TaskQueue.push_back(std::move(Task));
|
|
}
|
|
|
|
bool LinkerDriver::run() {
|
|
ScopedTimer T(InputFileTimer);
|
|
|
|
bool DidWork = !TaskQueue.empty();
|
|
while (!TaskQueue.empty()) {
|
|
TaskQueue.front()();
|
|
TaskQueue.pop_front();
|
|
}
|
|
return DidWork;
|
|
}
|
|
|
|
// Parse an /order file. If an option is given, the linker places
|
|
// COMDAT sections in the same order as their names appear in the
|
|
// given file.
|
|
static void parseOrderFile(StringRef Arg) {
|
|
// For some reason, the MSVC linker requires a filename to be
|
|
// preceded by "@".
|
|
if (!Arg.startswith("@")) {
|
|
error("malformed /order option: '@' missing");
|
|
return;
|
|
}
|
|
|
|
// Get a list of all comdat sections for error checking.
|
|
DenseSet<StringRef> Set;
|
|
for (Chunk *C : Symtab->getChunks())
|
|
if (auto *Sec = dyn_cast<SectionChunk>(C))
|
|
if (Sec->Sym)
|
|
Set.insert(Sec->Sym->getName());
|
|
|
|
// Open a file.
|
|
StringRef Path = Arg.substr(1);
|
|
std::unique_ptr<MemoryBuffer> MB = CHECK(
|
|
MemoryBuffer::getFile(Path, -1, false, true), "could not open " + Path);
|
|
|
|
// Parse a file. An order file contains one symbol per line.
|
|
// All symbols that were not present in a given order file are
|
|
// considered to have the lowest priority 0 and are placed at
|
|
// end of an output section.
|
|
for (std::string S : args::getLines(MB->getMemBufferRef())) {
|
|
if (Config->Machine == I386 && !isDecorated(S))
|
|
S = "_" + S;
|
|
|
|
if (Set.count(S) == 0) {
|
|
if (Config->WarnMissingOrderSymbol)
|
|
warn("/order:" + Arg + ": missing symbol: " + S + " [LNK4037]");
|
|
}
|
|
else
|
|
Config->Order[S] = INT_MIN + Config->Order.size();
|
|
}
|
|
}
|
|
|
|
static void markAddrsig(Symbol *S) {
|
|
if (auto *D = dyn_cast_or_null<Defined>(S))
|
|
if (Chunk *C = D->getChunk())
|
|
C->KeepUnique = true;
|
|
}
|
|
|
|
static void findKeepUniqueSections() {
|
|
// Exported symbols could be address-significant in other executables or DSOs,
|
|
// so we conservatively mark them as address-significant.
|
|
for (Export &R : Config->Exports)
|
|
markAddrsig(R.Sym);
|
|
|
|
// Visit the address-significance table in each object file and mark each
|
|
// referenced symbol as address-significant.
|
|
for (ObjFile *Obj : ObjFile::Instances) {
|
|
ArrayRef<Symbol *> Syms = Obj->getSymbols();
|
|
if (Obj->AddrsigSec) {
|
|
ArrayRef<uint8_t> Contents;
|
|
Obj->getCOFFObj()->getSectionContents(Obj->AddrsigSec, Contents);
|
|
const uint8_t *Cur = Contents.begin();
|
|
while (Cur != Contents.end()) {
|
|
unsigned Size;
|
|
const char *Err;
|
|
uint64_t SymIndex = decodeULEB128(Cur, &Size, Contents.end(), &Err);
|
|
if (Err)
|
|
fatal(toString(Obj) + ": could not decode addrsig section: " + Err);
|
|
if (SymIndex >= Syms.size())
|
|
fatal(toString(Obj) + ": invalid symbol index in addrsig section");
|
|
markAddrsig(Syms[SymIndex]);
|
|
Cur += Size;
|
|
}
|
|
} else {
|
|
// If an object file does not have an address-significance table,
|
|
// conservatively mark all of its symbols as address-significant.
|
|
for (Symbol *S : Syms)
|
|
markAddrsig(S);
|
|
}
|
|
}
|
|
}
|
|
|
|
// link.exe replaces each %foo% in AltPath with the contents of environment
|
|
// variable foo, and adds the two magic env vars _PDB (expands to the basename
|
|
// of pdb's output path) and _EXT (expands to the extension of the output
|
|
// binary).
|
|
// lld only supports %_PDB% and %_EXT% and warns on references to all other env
|
|
// vars.
|
|
static void parsePDBAltPath(StringRef AltPath) {
|
|
SmallString<128> Buf;
|
|
StringRef PDBBasename =
|
|
sys::path::filename(Config->PDBPath, sys::path::Style::windows);
|
|
StringRef BinaryExtension =
|
|
sys::path::extension(Config->OutputFile, sys::path::Style::windows);
|
|
if (!BinaryExtension.empty())
|
|
BinaryExtension = BinaryExtension.substr(1); // %_EXT% does not include '.'.
|
|
|
|
// Invariant:
|
|
// +--------- Cursor ('a...' might be the empty string).
|
|
// | +----- FirstMark
|
|
// | | +- SecondMark
|
|
// v v v
|
|
// a...%...%...
|
|
size_t Cursor = 0;
|
|
while (Cursor < AltPath.size()) {
|
|
size_t FirstMark, SecondMark;
|
|
if ((FirstMark = AltPath.find('%', Cursor)) == StringRef::npos ||
|
|
(SecondMark = AltPath.find('%', FirstMark + 1)) == StringRef::npos) {
|
|
// Didn't find another full fragment, treat rest of string as literal.
|
|
Buf.append(AltPath.substr(Cursor));
|
|
break;
|
|
}
|
|
|
|
// Found a full fragment. Append text in front of first %, and interpret
|
|
// text between first and second % as variable name.
|
|
Buf.append(AltPath.substr(Cursor, FirstMark - Cursor));
|
|
StringRef Var = AltPath.substr(FirstMark, SecondMark - FirstMark + 1);
|
|
if (Var.equals_lower("%_pdb%"))
|
|
Buf.append(PDBBasename);
|
|
else if (Var.equals_lower("%_ext%"))
|
|
Buf.append(BinaryExtension);
|
|
else {
|
|
warn("only %_PDB% and %_EXT% supported in /pdbaltpath:, keeping " +
|
|
Var + " as literal");
|
|
Buf.append(Var);
|
|
}
|
|
|
|
Cursor = SecondMark + 1;
|
|
}
|
|
|
|
Config->PDBAltPath = Buf;
|
|
}
|
|
|
|
void LinkerDriver::link(ArrayRef<const char *> ArgsArr) {
|
|
// If the first command line argument is "/lib", link.exe acts like lib.exe.
|
|
// We call our own implementation of lib.exe that understands bitcode files.
|
|
if (ArgsArr.size() > 1 && StringRef(ArgsArr[1]).equals_lower("/lib")) {
|
|
if (llvm::libDriverMain(ArgsArr.slice(1)) != 0)
|
|
fatal("lib failed");
|
|
return;
|
|
}
|
|
|
|
// Needed for LTO.
|
|
InitializeAllTargetInfos();
|
|
InitializeAllTargets();
|
|
InitializeAllTargetMCs();
|
|
InitializeAllAsmParsers();
|
|
InitializeAllAsmPrinters();
|
|
|
|
// Parse command line options.
|
|
ArgParser Parser;
|
|
opt::InputArgList Args = Parser.parseLINK(ArgsArr);
|
|
|
|
// Parse and evaluate -mllvm options.
|
|
std::vector<const char *> V;
|
|
V.push_back("lld-link (LLVM option parsing)");
|
|
for (auto *Arg : Args.filtered(OPT_mllvm))
|
|
V.push_back(Arg->getValue());
|
|
cl::ParseCommandLineOptions(V.size(), V.data());
|
|
|
|
// Handle /errorlimit early, because error() depends on it.
|
|
if (auto *Arg = Args.getLastArg(OPT_errorlimit)) {
|
|
int N = 20;
|
|
StringRef S = Arg->getValue();
|
|
if (S.getAsInteger(10, N))
|
|
error(Arg->getSpelling() + " number expected, but got " + S);
|
|
errorHandler().ErrorLimit = N;
|
|
}
|
|
|
|
// Handle /help
|
|
if (Args.hasArg(OPT_help)) {
|
|
printHelp(ArgsArr[0]);
|
|
return;
|
|
}
|
|
|
|
if (Args.hasArg(OPT_show_timing))
|
|
Config->ShowTiming = true;
|
|
|
|
ScopedTimer T(Timer::root());
|
|
// Handle --version, which is an lld extension. This option is a bit odd
|
|
// because it doesn't start with "/", but we deliberately chose "--" to
|
|
// avoid conflict with /version and for compatibility with clang-cl.
|
|
if (Args.hasArg(OPT_dash_dash_version)) {
|
|
outs() << getLLDVersion() << "\n";
|
|
return;
|
|
}
|
|
|
|
// Handle /lldmingw early, since it can potentially affect how other
|
|
// options are handled.
|
|
Config->MinGW = Args.hasArg(OPT_lldmingw);
|
|
|
|
if (auto *Arg = Args.getLastArg(OPT_linkrepro)) {
|
|
SmallString<64> Path = StringRef(Arg->getValue());
|
|
sys::path::append(Path, "repro.tar");
|
|
|
|
Expected<std::unique_ptr<TarWriter>> ErrOrWriter =
|
|
TarWriter::create(Path, "repro");
|
|
|
|
if (ErrOrWriter) {
|
|
Tar = std::move(*ErrOrWriter);
|
|
} else {
|
|
error("/linkrepro: failed to open " + Path + ": " +
|
|
toString(ErrOrWriter.takeError()));
|
|
}
|
|
}
|
|
|
|
if (!Args.hasArg(OPT_INPUT)) {
|
|
if (Args.hasArg(OPT_deffile))
|
|
Config->NoEntry = true;
|
|
else
|
|
fatal("no input files");
|
|
}
|
|
|
|
// Construct search path list.
|
|
SearchPaths.push_back("");
|
|
for (auto *Arg : Args.filtered(OPT_libpath))
|
|
SearchPaths.push_back(Arg->getValue());
|
|
addLibSearchPaths();
|
|
|
|
// Handle /ignore
|
|
for (auto *Arg : Args.filtered(OPT_ignore)) {
|
|
SmallVector<StringRef, 8> Vec;
|
|
StringRef(Arg->getValue()).split(Vec, ',');
|
|
for (StringRef S : Vec) {
|
|
if (S == "4037")
|
|
Config->WarnMissingOrderSymbol = false;
|
|
else if (S == "4099")
|
|
Config->WarnDebugInfoUnusable = false;
|
|
else if (S == "4217")
|
|
Config->WarnLocallyDefinedImported = false;
|
|
// Other warning numbers are ignored.
|
|
}
|
|
}
|
|
|
|
// Handle /out
|
|
if (auto *Arg = Args.getLastArg(OPT_out))
|
|
Config->OutputFile = Arg->getValue();
|
|
|
|
// Handle /verbose
|
|
if (Args.hasArg(OPT_verbose))
|
|
Config->Verbose = true;
|
|
errorHandler().Verbose = Config->Verbose;
|
|
|
|
// Handle /force or /force:unresolved
|
|
if (Args.hasArg(OPT_force, OPT_force_unresolved))
|
|
Config->ForceUnresolved = true;
|
|
|
|
// Handle /force or /force:multiple
|
|
if (Args.hasArg(OPT_force, OPT_force_multiple))
|
|
Config->ForceMultiple = true;
|
|
|
|
// Handle /debug
|
|
DebugKind Debug = parseDebugKind(Args);
|
|
if (Debug == DebugKind::Full || Debug == DebugKind::Dwarf ||
|
|
Debug == DebugKind::GHash) {
|
|
Config->Debug = true;
|
|
Config->Incremental = true;
|
|
}
|
|
|
|
// Handle /debugtype
|
|
Config->DebugTypes = parseDebugTypes(Args);
|
|
|
|
// Handle /pdb
|
|
bool ShouldCreatePDB =
|
|
(Debug == DebugKind::Full || Debug == DebugKind::GHash);
|
|
if (ShouldCreatePDB) {
|
|
if (auto *Arg = Args.getLastArg(OPT_pdb))
|
|
Config->PDBPath = Arg->getValue();
|
|
if (auto *Arg = Args.getLastArg(OPT_pdbaltpath))
|
|
Config->PDBAltPath = Arg->getValue();
|
|
if (Args.hasArg(OPT_natvis))
|
|
Config->NatvisFiles = Args.getAllArgValues(OPT_natvis);
|
|
|
|
if (auto *Arg = Args.getLastArg(OPT_pdb_source_path))
|
|
Config->PDBSourcePath = Arg->getValue();
|
|
}
|
|
|
|
// Handle /noentry
|
|
if (Args.hasArg(OPT_noentry)) {
|
|
if (Args.hasArg(OPT_dll))
|
|
Config->NoEntry = true;
|
|
else
|
|
error("/noentry must be specified with /dll");
|
|
}
|
|
|
|
// Handle /dll
|
|
if (Args.hasArg(OPT_dll)) {
|
|
Config->DLL = true;
|
|
Config->ManifestID = 2;
|
|
}
|
|
|
|
// Handle /dynamicbase and /fixed. We can't use hasFlag for /dynamicbase
|
|
// because we need to explicitly check whether that option or its inverse was
|
|
// present in the argument list in order to handle /fixed.
|
|
auto *DynamicBaseArg = Args.getLastArg(OPT_dynamicbase, OPT_dynamicbase_no);
|
|
if (DynamicBaseArg &&
|
|
DynamicBaseArg->getOption().getID() == OPT_dynamicbase_no)
|
|
Config->DynamicBase = false;
|
|
|
|
// MSDN claims "/FIXED:NO is the default setting for a DLL, and /FIXED is the
|
|
// default setting for any other project type.", but link.exe defaults to
|
|
// /FIXED:NO for exe outputs as well. Match behavior, not docs.
|
|
bool Fixed = Args.hasFlag(OPT_fixed, OPT_fixed_no, false);
|
|
if (Fixed) {
|
|
if (DynamicBaseArg &&
|
|
DynamicBaseArg->getOption().getID() == OPT_dynamicbase) {
|
|
error("/fixed must not be specified with /dynamicbase");
|
|
} else {
|
|
Config->Relocatable = false;
|
|
Config->DynamicBase = false;
|
|
}
|
|
}
|
|
|
|
// Handle /appcontainer
|
|
Config->AppContainer =
|
|
Args.hasFlag(OPT_appcontainer, OPT_appcontainer_no, false);
|
|
|
|
// Handle /machine
|
|
if (auto *Arg = Args.getLastArg(OPT_machine))
|
|
Config->Machine = getMachineType(Arg->getValue());
|
|
|
|
// Handle /nodefaultlib:<filename>
|
|
for (auto *Arg : Args.filtered(OPT_nodefaultlib))
|
|
Config->NoDefaultLibs.insert(doFindLib(Arg->getValue()));
|
|
|
|
// Handle /nodefaultlib
|
|
if (Args.hasArg(OPT_nodefaultlib_all))
|
|
Config->NoDefaultLibAll = true;
|
|
|
|
// Handle /base
|
|
if (auto *Arg = Args.getLastArg(OPT_base))
|
|
parseNumbers(Arg->getValue(), &Config->ImageBase);
|
|
|
|
// Handle /stack
|
|
if (auto *Arg = Args.getLastArg(OPT_stack))
|
|
parseNumbers(Arg->getValue(), &Config->StackReserve, &Config->StackCommit);
|
|
|
|
// Handle /guard:cf
|
|
if (auto *Arg = Args.getLastArg(OPT_guard))
|
|
parseGuard(Arg->getValue());
|
|
|
|
// Handle /heap
|
|
if (auto *Arg = Args.getLastArg(OPT_heap))
|
|
parseNumbers(Arg->getValue(), &Config->HeapReserve, &Config->HeapCommit);
|
|
|
|
// Handle /version
|
|
if (auto *Arg = Args.getLastArg(OPT_version))
|
|
parseVersion(Arg->getValue(), &Config->MajorImageVersion,
|
|
&Config->MinorImageVersion);
|
|
|
|
// Handle /subsystem
|
|
if (auto *Arg = Args.getLastArg(OPT_subsystem))
|
|
parseSubsystem(Arg->getValue(), &Config->Subsystem, &Config->MajorOSVersion,
|
|
&Config->MinorOSVersion);
|
|
|
|
// Handle /timestamp
|
|
if (llvm::opt::Arg *Arg = Args.getLastArg(OPT_timestamp, OPT_repro)) {
|
|
if (Arg->getOption().getID() == OPT_repro) {
|
|
Config->Timestamp = 0;
|
|
Config->Repro = true;
|
|
} else {
|
|
Config->Repro = false;
|
|
StringRef Value(Arg->getValue());
|
|
if (Value.getAsInteger(0, Config->Timestamp))
|
|
fatal(Twine("invalid timestamp: ") + Value +
|
|
". Expected 32-bit integer");
|
|
}
|
|
} else {
|
|
Config->Repro = false;
|
|
Config->Timestamp = time(nullptr);
|
|
}
|
|
|
|
// Handle /alternatename
|
|
for (auto *Arg : Args.filtered(OPT_alternatename))
|
|
parseAlternateName(Arg->getValue());
|
|
|
|
// Handle /include
|
|
for (auto *Arg : Args.filtered(OPT_incl))
|
|
addUndefined(Arg->getValue());
|
|
|
|
// Handle /implib
|
|
if (auto *Arg = Args.getLastArg(OPT_implib))
|
|
Config->Implib = Arg->getValue();
|
|
|
|
// Handle /opt.
|
|
bool DoGC = Debug == DebugKind::None || Args.hasArg(OPT_profile);
|
|
unsigned ICFLevel =
|
|
Args.hasArg(OPT_profile) ? 0 : 1; // 0: off, 1: limited, 2: on
|
|
unsigned TailMerge = 1;
|
|
for (auto *Arg : Args.filtered(OPT_opt)) {
|
|
std::string Str = StringRef(Arg->getValue()).lower();
|
|
SmallVector<StringRef, 1> Vec;
|
|
StringRef(Str).split(Vec, ',');
|
|
for (StringRef S : Vec) {
|
|
if (S == "ref") {
|
|
DoGC = true;
|
|
} else if (S == "noref") {
|
|
DoGC = false;
|
|
} else if (S == "icf" || S.startswith("icf=")) {
|
|
ICFLevel = 2;
|
|
} else if (S == "noicf") {
|
|
ICFLevel = 0;
|
|
} else if (S == "lldtailmerge") {
|
|
TailMerge = 2;
|
|
} else if (S == "nolldtailmerge") {
|
|
TailMerge = 0;
|
|
} else if (S.startswith("lldlto=")) {
|
|
StringRef OptLevel = S.substr(7);
|
|
if (OptLevel.getAsInteger(10, Config->LTOO) || Config->LTOO > 3)
|
|
error("/opt:lldlto: invalid optimization level: " + OptLevel);
|
|
} else if (S.startswith("lldltojobs=")) {
|
|
StringRef Jobs = S.substr(11);
|
|
if (Jobs.getAsInteger(10, Config->ThinLTOJobs) ||
|
|
Config->ThinLTOJobs == 0)
|
|
error("/opt:lldltojobs: invalid job count: " + Jobs);
|
|
} else if (S.startswith("lldltopartitions=")) {
|
|
StringRef N = S.substr(17);
|
|
if (N.getAsInteger(10, Config->LTOPartitions) ||
|
|
Config->LTOPartitions == 0)
|
|
error("/opt:lldltopartitions: invalid partition count: " + N);
|
|
} else if (S != "lbr" && S != "nolbr")
|
|
error("/opt: unknown option: " + S);
|
|
}
|
|
}
|
|
|
|
// Limited ICF is enabled if GC is enabled and ICF was never mentioned
|
|
// explicitly.
|
|
// FIXME: LLD only implements "limited" ICF, i.e. it only merges identical
|
|
// code. If the user passes /OPT:ICF explicitly, LLD should merge identical
|
|
// comdat readonly data.
|
|
if (ICFLevel == 1 && !DoGC)
|
|
ICFLevel = 0;
|
|
Config->DoGC = DoGC;
|
|
Config->DoICF = ICFLevel > 0;
|
|
Config->TailMerge = (TailMerge == 1 && Config->DoICF) || TailMerge == 2;
|
|
|
|
// Handle /lldsavetemps
|
|
if (Args.hasArg(OPT_lldsavetemps))
|
|
Config->SaveTemps = true;
|
|
|
|
// Handle /kill-at
|
|
if (Args.hasArg(OPT_kill_at))
|
|
Config->KillAt = true;
|
|
|
|
// Handle /lldltocache
|
|
if (auto *Arg = Args.getLastArg(OPT_lldltocache))
|
|
Config->LTOCache = Arg->getValue();
|
|
|
|
// Handle /lldsavecachepolicy
|
|
if (auto *Arg = Args.getLastArg(OPT_lldltocachepolicy))
|
|
Config->LTOCachePolicy = CHECK(
|
|
parseCachePruningPolicy(Arg->getValue()),
|
|
Twine("/lldltocachepolicy: invalid cache policy: ") + Arg->getValue());
|
|
|
|
// Handle /failifmismatch
|
|
for (auto *Arg : Args.filtered(OPT_failifmismatch))
|
|
checkFailIfMismatch(Arg->getValue());
|
|
|
|
// Handle /merge
|
|
for (auto *Arg : Args.filtered(OPT_merge))
|
|
parseMerge(Arg->getValue());
|
|
|
|
// Add default section merging rules after user rules. User rules take
|
|
// precedence, but we will emit a warning if there is a conflict.
|
|
parseMerge(".idata=.rdata");
|
|
parseMerge(".didat=.rdata");
|
|
parseMerge(".edata=.rdata");
|
|
parseMerge(".xdata=.rdata");
|
|
parseMerge(".bss=.data");
|
|
|
|
if (Config->MinGW) {
|
|
parseMerge(".ctors=.rdata");
|
|
parseMerge(".dtors=.rdata");
|
|
parseMerge(".CRT=.rdata");
|
|
}
|
|
|
|
// Handle /section
|
|
for (auto *Arg : Args.filtered(OPT_section))
|
|
parseSection(Arg->getValue());
|
|
|
|
// Handle /aligncomm
|
|
for (auto *Arg : Args.filtered(OPT_aligncomm))
|
|
parseAligncomm(Arg->getValue());
|
|
|
|
// Handle /manifestdependency. This enables /manifest unless /manifest:no is
|
|
// also passed.
|
|
if (auto *Arg = Args.getLastArg(OPT_manifestdependency)) {
|
|
Config->ManifestDependency = Arg->getValue();
|
|
Config->Manifest = Configuration::SideBySide;
|
|
}
|
|
|
|
// Handle /manifest and /manifest:
|
|
if (auto *Arg = Args.getLastArg(OPT_manifest, OPT_manifest_colon)) {
|
|
if (Arg->getOption().getID() == OPT_manifest)
|
|
Config->Manifest = Configuration::SideBySide;
|
|
else
|
|
parseManifest(Arg->getValue());
|
|
}
|
|
|
|
// Handle /manifestuac
|
|
if (auto *Arg = Args.getLastArg(OPT_manifestuac))
|
|
parseManifestUAC(Arg->getValue());
|
|
|
|
// Handle /manifestfile
|
|
if (auto *Arg = Args.getLastArg(OPT_manifestfile))
|
|
Config->ManifestFile = Arg->getValue();
|
|
|
|
// Handle /manifestinput
|
|
for (auto *Arg : Args.filtered(OPT_manifestinput))
|
|
Config->ManifestInput.push_back(Arg->getValue());
|
|
|
|
if (!Config->ManifestInput.empty() &&
|
|
Config->Manifest != Configuration::Embed) {
|
|
fatal("/manifestinput: requires /manifest:embed");
|
|
}
|
|
|
|
// Handle miscellaneous boolean flags.
|
|
Config->AllowBind = Args.hasFlag(OPT_allowbind, OPT_allowbind_no, true);
|
|
Config->AllowIsolation =
|
|
Args.hasFlag(OPT_allowisolation, OPT_allowisolation_no, true);
|
|
Config->Incremental =
|
|
Args.hasFlag(OPT_incremental, OPT_incremental_no,
|
|
!Config->DoGC && !Config->DoICF && !Args.hasArg(OPT_order) &&
|
|
!Args.hasArg(OPT_profile));
|
|
Config->IntegrityCheck =
|
|
Args.hasFlag(OPT_integritycheck, OPT_integritycheck_no, false);
|
|
Config->NxCompat = Args.hasFlag(OPT_nxcompat, OPT_nxcompat_no, true);
|
|
Config->TerminalServerAware =
|
|
!Config->DLL && Args.hasFlag(OPT_tsaware, OPT_tsaware_no, true);
|
|
Config->DebugDwarf = Debug == DebugKind::Dwarf;
|
|
Config->DebugGHashes = Debug == DebugKind::GHash;
|
|
Config->DebugSymtab = Debug == DebugKind::Symtab;
|
|
|
|
Config->MapFile = getMapFile(Args);
|
|
|
|
if (Config->Incremental && Args.hasArg(OPT_profile)) {
|
|
warn("ignoring '/incremental' due to '/profile' specification");
|
|
Config->Incremental = false;
|
|
}
|
|
|
|
if (Config->Incremental && Args.hasArg(OPT_order)) {
|
|
warn("ignoring '/incremental' due to '/order' specification");
|
|
Config->Incremental = false;
|
|
}
|
|
|
|
if (Config->Incremental && Config->DoGC) {
|
|
warn("ignoring '/incremental' because REF is enabled; use '/opt:noref' to "
|
|
"disable");
|
|
Config->Incremental = false;
|
|
}
|
|
|
|
if (Config->Incremental && Config->DoICF) {
|
|
warn("ignoring '/incremental' because ICF is enabled; use '/opt:noicf' to "
|
|
"disable");
|
|
Config->Incremental = false;
|
|
}
|
|
|
|
if (errorCount())
|
|
return;
|
|
|
|
std::set<sys::fs::UniqueID> WholeArchives;
|
|
AutoExporter Exporter;
|
|
for (auto *Arg : Args.filtered(OPT_wholearchive_file)) {
|
|
if (Optional<StringRef> Path = doFindFile(Arg->getValue())) {
|
|
if (Optional<sys::fs::UniqueID> ID = getUniqueID(*Path))
|
|
WholeArchives.insert(*ID);
|
|
Exporter.addWholeArchive(*Path);
|
|
}
|
|
}
|
|
|
|
// A predicate returning true if a given path is an argument for
|
|
// /wholearchive:, or /wholearchive is enabled globally.
|
|
// This function is a bit tricky because "foo.obj /wholearchive:././foo.obj"
|
|
// needs to be handled as "/wholearchive:foo.obj foo.obj".
|
|
auto IsWholeArchive = [&](StringRef Path) -> bool {
|
|
if (Args.hasArg(OPT_wholearchive_flag))
|
|
return true;
|
|
if (Optional<sys::fs::UniqueID> ID = getUniqueID(Path))
|
|
return WholeArchives.count(*ID);
|
|
return false;
|
|
};
|
|
|
|
// Create a list of input files. Files can be given as arguments
|
|
// for /defaultlib option.
|
|
for (auto *Arg : Args.filtered(OPT_INPUT, OPT_wholearchive_file))
|
|
if (Optional<StringRef> Path = findFile(Arg->getValue()))
|
|
enqueuePath(*Path, IsWholeArchive(*Path));
|
|
|
|
for (auto *Arg : Args.filtered(OPT_defaultlib))
|
|
if (Optional<StringRef> Path = findLib(Arg->getValue()))
|
|
enqueuePath(*Path, false);
|
|
|
|
// Windows specific -- Create a resource file containing a manifest file.
|
|
if (Config->Manifest == Configuration::Embed)
|
|
addBuffer(createManifestRes(), false);
|
|
|
|
// Read all input files given via the command line.
|
|
run();
|
|
|
|
if (errorCount())
|
|
return;
|
|
|
|
// We should have inferred a machine type by now from the input files, but if
|
|
// not we assume x64.
|
|
if (Config->Machine == IMAGE_FILE_MACHINE_UNKNOWN) {
|
|
warn("/machine is not specified. x64 is assumed");
|
|
Config->Machine = AMD64;
|
|
}
|
|
Config->Wordsize = Config->is64() ? 8 : 4;
|
|
|
|
// Input files can be Windows resource files (.res files). We use
|
|
// WindowsResource to convert resource files to a regular COFF file,
|
|
// then link the resulting file normally.
|
|
if (!Resources.empty())
|
|
Symtab->addFile(make<ObjFile>(convertResToCOFF(Resources)));
|
|
|
|
if (Tar)
|
|
Tar->append("response.txt",
|
|
createResponseFile(Args, FilePaths,
|
|
ArrayRef<StringRef>(SearchPaths).slice(1)));
|
|
|
|
// Handle /largeaddressaware
|
|
Config->LargeAddressAware = Args.hasFlag(
|
|
OPT_largeaddressaware, OPT_largeaddressaware_no, Config->is64());
|
|
|
|
// Handle /highentropyva
|
|
Config->HighEntropyVA =
|
|
Config->is64() &&
|
|
Args.hasFlag(OPT_highentropyva, OPT_highentropyva_no, true);
|
|
|
|
if (!Config->DynamicBase &&
|
|
(Config->Machine == ARMNT || Config->Machine == ARM64))
|
|
error("/dynamicbase:no is not compatible with " +
|
|
machineToStr(Config->Machine));
|
|
|
|
// Handle /export
|
|
for (auto *Arg : Args.filtered(OPT_export)) {
|
|
Export E = parseExport(Arg->getValue());
|
|
if (Config->Machine == I386) {
|
|
if (!isDecorated(E.Name))
|
|
E.Name = Saver.save("_" + E.Name);
|
|
if (!E.ExtName.empty() && !isDecorated(E.ExtName))
|
|
E.ExtName = Saver.save("_" + E.ExtName);
|
|
}
|
|
Config->Exports.push_back(E);
|
|
}
|
|
|
|
// Handle /def
|
|
if (auto *Arg = Args.getLastArg(OPT_deffile)) {
|
|
// parseModuleDefs mutates Config object.
|
|
parseModuleDefs(Arg->getValue());
|
|
}
|
|
|
|
// Handle generation of import library from a def file.
|
|
if (!Args.hasArg(OPT_INPUT)) {
|
|
fixupExports();
|
|
createImportLibrary(/*AsLib=*/true);
|
|
return;
|
|
}
|
|
|
|
// Windows specific -- if no /subsystem is given, we need to infer
|
|
// that from entry point name. Must happen before /entry handling,
|
|
// and after the early return when just writing an import library.
|
|
if (Config->Subsystem == IMAGE_SUBSYSTEM_UNKNOWN) {
|
|
Config->Subsystem = inferSubsystem();
|
|
if (Config->Subsystem == IMAGE_SUBSYSTEM_UNKNOWN)
|
|
fatal("subsystem must be defined");
|
|
}
|
|
|
|
// Handle /entry and /dll
|
|
if (auto *Arg = Args.getLastArg(OPT_entry)) {
|
|
Config->Entry = addUndefined(mangle(Arg->getValue()));
|
|
} else if (!Config->Entry && !Config->NoEntry) {
|
|
if (Args.hasArg(OPT_dll)) {
|
|
StringRef S = (Config->Machine == I386) ? "__DllMainCRTStartup@12"
|
|
: "_DllMainCRTStartup";
|
|
Config->Entry = addUndefined(S);
|
|
} else {
|
|
// Windows specific -- If entry point name is not given, we need to
|
|
// infer that from user-defined entry name.
|
|
StringRef S = findDefaultEntry();
|
|
if (S.empty())
|
|
fatal("entry point must be defined");
|
|
Config->Entry = addUndefined(S);
|
|
log("Entry name inferred: " + S);
|
|
}
|
|
}
|
|
|
|
// Handle /delayload
|
|
for (auto *Arg : Args.filtered(OPT_delayload)) {
|
|
Config->DelayLoads.insert(StringRef(Arg->getValue()).lower());
|
|
if (Config->Machine == I386) {
|
|
Config->DelayLoadHelper = addUndefined("___delayLoadHelper2@8");
|
|
} else {
|
|
Config->DelayLoadHelper = addUndefined("__delayLoadHelper2");
|
|
}
|
|
}
|
|
|
|
// Set default image name if neither /out or /def set it.
|
|
if (Config->OutputFile.empty()) {
|
|
Config->OutputFile =
|
|
getOutputPath((*Args.filtered(OPT_INPUT).begin())->getValue());
|
|
}
|
|
|
|
if (ShouldCreatePDB) {
|
|
// Put the PDB next to the image if no /pdb flag was passed.
|
|
if (Config->PDBPath.empty()) {
|
|
Config->PDBPath = Config->OutputFile;
|
|
sys::path::replace_extension(Config->PDBPath, ".pdb");
|
|
}
|
|
|
|
// The embedded PDB path should be the absolute path to the PDB if no
|
|
// /pdbaltpath flag was passed.
|
|
if (Config->PDBAltPath.empty()) {
|
|
Config->PDBAltPath = Config->PDBPath;
|
|
|
|
// It's important to make the path absolute and remove dots. This path
|
|
// will eventually be written into the PE header, and certain Microsoft
|
|
// tools won't work correctly if these assumptions are not held.
|
|
sys::fs::make_absolute(Config->PDBAltPath);
|
|
sys::path::remove_dots(Config->PDBAltPath);
|
|
} else {
|
|
// Don't do this earlier, so that Config->OutputFile is ready.
|
|
parsePDBAltPath(Config->PDBAltPath);
|
|
}
|
|
}
|
|
|
|
// Set default image base if /base is not given.
|
|
if (Config->ImageBase == uint64_t(-1))
|
|
Config->ImageBase = getDefaultImageBase();
|
|
|
|
Symtab->addSynthetic(mangle("__ImageBase"), nullptr);
|
|
if (Config->Machine == I386) {
|
|
Symtab->addAbsolute("___safe_se_handler_table", 0);
|
|
Symtab->addAbsolute("___safe_se_handler_count", 0);
|
|
}
|
|
|
|
Symtab->addAbsolute(mangle("__guard_fids_count"), 0);
|
|
Symtab->addAbsolute(mangle("__guard_fids_table"), 0);
|
|
Symtab->addAbsolute(mangle("__guard_flags"), 0);
|
|
Symtab->addAbsolute(mangle("__guard_iat_count"), 0);
|
|
Symtab->addAbsolute(mangle("__guard_iat_table"), 0);
|
|
Symtab->addAbsolute(mangle("__guard_longjmp_count"), 0);
|
|
Symtab->addAbsolute(mangle("__guard_longjmp_table"), 0);
|
|
// Needed for MSVC 2017 15.5 CRT.
|
|
Symtab->addAbsolute(mangle("__enclave_config"), 0);
|
|
|
|
if (Config->MinGW) {
|
|
Symtab->addAbsolute(mangle("__RUNTIME_PSEUDO_RELOC_LIST__"), 0);
|
|
Symtab->addAbsolute(mangle("__RUNTIME_PSEUDO_RELOC_LIST_END__"), 0);
|
|
Symtab->addAbsolute(mangle("__CTOR_LIST__"), 0);
|
|
Symtab->addAbsolute(mangle("__DTOR_LIST__"), 0);
|
|
}
|
|
|
|
// This code may add new undefined symbols to the link, which may enqueue more
|
|
// symbol resolution tasks, so we need to continue executing tasks until we
|
|
// converge.
|
|
do {
|
|
// Windows specific -- if entry point is not found,
|
|
// search for its mangled names.
|
|
if (Config->Entry)
|
|
Symtab->mangleMaybe(Config->Entry);
|
|
|
|
// Windows specific -- Make sure we resolve all dllexported symbols.
|
|
for (Export &E : Config->Exports) {
|
|
if (!E.ForwardTo.empty())
|
|
continue;
|
|
E.Sym = addUndefined(E.Name);
|
|
if (!E.Directives)
|
|
Symtab->mangleMaybe(E.Sym);
|
|
}
|
|
|
|
// Add weak aliases. Weak aliases is a mechanism to give remaining
|
|
// undefined symbols final chance to be resolved successfully.
|
|
for (auto Pair : Config->AlternateNames) {
|
|
StringRef From = Pair.first;
|
|
StringRef To = Pair.second;
|
|
Symbol *Sym = Symtab->find(From);
|
|
if (!Sym)
|
|
continue;
|
|
if (auto *U = dyn_cast<Undefined>(Sym))
|
|
if (!U->WeakAlias)
|
|
U->WeakAlias = Symtab->addUndefined(To);
|
|
}
|
|
|
|
// Windows specific -- if __load_config_used can be resolved, resolve it.
|
|
if (Symtab->findUnderscore("_load_config_used"))
|
|
addUndefined(mangle("_load_config_used"));
|
|
} while (run());
|
|
|
|
if (errorCount())
|
|
return;
|
|
|
|
// Do LTO by compiling bitcode input files to a set of native COFF files then
|
|
// link those files.
|
|
Symtab->addCombinedLTOObjects();
|
|
run();
|
|
|
|
if (Config->MinGW) {
|
|
// Load any further object files that might be needed for doing automatic
|
|
// imports.
|
|
//
|
|
// For cases with no automatically imported symbols, this iterates once
|
|
// over the symbol table and doesn't do anything.
|
|
//
|
|
// For the normal case with a few automatically imported symbols, this
|
|
// should only need to be run once, since each new object file imported
|
|
// is an import library and wouldn't add any new undefined references,
|
|
// but there's nothing stopping the __imp_ symbols from coming from a
|
|
// normal object file as well (although that won't be used for the
|
|
// actual autoimport later on). If this pass adds new undefined references,
|
|
// we won't iterate further to resolve them.
|
|
Symtab->loadMinGWAutomaticImports();
|
|
run();
|
|
}
|
|
|
|
// Make sure we have resolved all symbols.
|
|
Symtab->reportRemainingUndefines();
|
|
if (errorCount())
|
|
return;
|
|
|
|
// Handle /safeseh.
|
|
if (Args.hasFlag(OPT_safeseh, OPT_safeseh_no, false)) {
|
|
for (ObjFile *File : ObjFile::Instances)
|
|
if (!File->hasSafeSEH())
|
|
error("/safeseh: " + File->getName() + " is not compatible with SEH");
|
|
if (errorCount())
|
|
return;
|
|
}
|
|
|
|
// In MinGW, all symbols are automatically exported if no symbols
|
|
// are chosen to be exported.
|
|
if (Config->DLL && ((Config->MinGW && Config->Exports.empty()) ||
|
|
Args.hasArg(OPT_export_all_symbols))) {
|
|
Exporter.initSymbolExcludes();
|
|
|
|
Symtab->forEachSymbol([=](Symbol *S) {
|
|
auto *Def = dyn_cast<Defined>(S);
|
|
if (!Exporter.shouldExport(Def))
|
|
return;
|
|
Export E;
|
|
E.Name = Def->getName();
|
|
E.Sym = Def;
|
|
if (Def->getChunk() &&
|
|
!(Def->getChunk()->getOutputCharacteristics() & IMAGE_SCN_MEM_EXECUTE))
|
|
E.Data = true;
|
|
Config->Exports.push_back(E);
|
|
});
|
|
}
|
|
|
|
// Windows specific -- when we are creating a .dll file, we also
|
|
// need to create a .lib file.
|
|
if (!Config->Exports.empty() || Config->DLL) {
|
|
fixupExports();
|
|
createImportLibrary(/*AsLib=*/false);
|
|
assignExportOrdinals();
|
|
}
|
|
|
|
// Handle /output-def (MinGW specific).
|
|
if (auto *Arg = Args.getLastArg(OPT_output_def))
|
|
writeDefFile(Arg->getValue());
|
|
|
|
// Set extra alignment for .comm symbols
|
|
for (auto Pair : Config->AlignComm) {
|
|
StringRef Name = Pair.first;
|
|
uint32_t Alignment = Pair.second;
|
|
|
|
Symbol *Sym = Symtab->find(Name);
|
|
if (!Sym) {
|
|
warn("/aligncomm symbol " + Name + " not found");
|
|
continue;
|
|
}
|
|
|
|
// If the symbol isn't common, it must have been replaced with a regular
|
|
// symbol, which will carry its own alignment.
|
|
auto *DC = dyn_cast<DefinedCommon>(Sym);
|
|
if (!DC)
|
|
continue;
|
|
|
|
CommonChunk *C = DC->getChunk();
|
|
C->Alignment = std::max(C->Alignment, Alignment);
|
|
}
|
|
|
|
// Windows specific -- Create a side-by-side manifest file.
|
|
if (Config->Manifest == Configuration::SideBySide)
|
|
createSideBySideManifest();
|
|
|
|
// Handle /order. We want to do this at this moment because we
|
|
// need a complete list of comdat sections to warn on nonexistent
|
|
// functions.
|
|
if (auto *Arg = Args.getLastArg(OPT_order))
|
|
parseOrderFile(Arg->getValue());
|
|
|
|
// Identify unreferenced COMDAT sections.
|
|
if (Config->DoGC)
|
|
markLive(Symtab->getChunks());
|
|
|
|
// Identify identical COMDAT sections to merge them.
|
|
if (Config->DoICF) {
|
|
findKeepUniqueSections();
|
|
doICF(Symtab->getChunks());
|
|
}
|
|
|
|
// Write the result.
|
|
writeResult();
|
|
|
|
// Stop early so we can print the results.
|
|
Timer::root().stop();
|
|
if (Config->ShowTiming)
|
|
Timer::root().print();
|
|
}
|
|
|
|
} // namespace coff
|
|
} // namespace lld
|