blob: 77e67b282665b90676cd20d59e33697287d72f5c [file] [log] [blame]
//===- Driver.h -------------------------------------------------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "COFFLinkerContext.h"
#include "Config.h"
#include "SymbolTable.h"
#include "lld/Common/LLVM.h"
#include "lld/Common/Reproduce.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/COFF.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/TarWriter.h"
#include <memory>
#include <set>
#include <vector>
namespace lld {
namespace coff {
class LinkerDriver;
extern LinkerDriver *driver;
using llvm::COFF::MachineTypes;
using llvm::COFF::WindowsSubsystem;
using llvm::Optional;
class COFFOptTable : public llvm::opt::OptTable {
// Constructing the option table is expensive. Use a global table to avoid doing
// it more than once.
extern COFFOptTable optTable;
// The result of parsing the .drective section. The /export: and /include:
// options are handled separately because they reference symbols, and the number
// of symbols can be quite large. The LLVM Option library will perform at least
// one memory allocation per argument, and that is prohibitively slow for
// parsing directives.
struct ParsedDirectives {
std::vector<StringRef> exports;
std::vector<StringRef> includes;
llvm::opt::InputArgList args;
class ArgParser {
// Parses command line options.
llvm::opt::InputArgList parse(llvm::ArrayRef<const char *> args);
// Tokenizes a given string and then parses as command line options.
llvm::opt::InputArgList parse(StringRef s) { return parse(tokenize(s)); }
// Tokenizes a given string and then parses as command line options in
// .drectve section. /EXPORT options are returned in second element
// to be processed in fastpath.
ParsedDirectives parseDirectives(StringRef s);
// Concatenate LINK environment variable.
void addLINK(SmallVector<const char *, 256> &argv);
std::vector<const char *> tokenize(StringRef s);
class LinkerDriver {
LinkerDriver(COFFLinkerContext &c) : ctx(c) {}
void linkerMain(llvm::ArrayRef<const char *> args);
// Used by the resolver to parse .drectve section contents.
void parseDirectives(InputFile *file);
// Used by ArchiveFile to enqueue members.
void enqueueArchiveMember(const Archive::Child &c, const Archive::Symbol &sym,
StringRef parentName);
void enqueuePDB(StringRef Path) { enqueuePath(Path, false, false); }
MemoryBufferRef takeBuffer(std::unique_ptr<MemoryBuffer> mb);
void enqueuePath(StringRef path, bool wholeArchive, bool lazy);
std::unique_ptr<llvm::TarWriter> tar; // for /linkrepro
// Searches a file from search paths.
Optional<StringRef> findFile(StringRef filename);
Optional<StringRef> findLib(StringRef filename);
StringRef doFindFile(StringRef filename);
StringRef doFindLib(StringRef filename);
StringRef doFindLibMinGW(StringRef filename);
bool findUnderscoreMangle(StringRef sym);
// Parses LIB environment which contains a list of search paths.
void addLibSearchPaths();
// Library search path. The first element is always "" (current directory).
std::vector<StringRef> searchPaths;
// Convert resource files and potentially merge input resource object
// trees into one resource tree.
void convertResources();
void maybeExportMinGWSymbols(const llvm::opt::InputArgList &args);
// We don't want to add the same file more than once.
// Files are uniquified by their filesystem and file number.
std::set<llvm::sys::fs::UniqueID> visitedFiles;
std::set<std::string> visitedLibs;
Symbol *addUndefined(StringRef sym);
StringRef mangleMaybe(Symbol *s);
// Windows specific -- "main" is not the only main function in Windows.
// You can choose one from these four -- {w,}{WinMain,main}.
// There are four different entry point functions for them,
// {w,}{WinMain,main}CRTStartup, respectively. The linker needs to
// choose the right one depending on which "main" function is defined.
// This function looks up the symbol table and resolve corresponding
// entry point name.
StringRef findDefaultEntry();
WindowsSubsystem inferSubsystem();
void addBuffer(std::unique_ptr<MemoryBuffer> mb, bool wholeArchive,
bool lazy);
void addArchiveBuffer(MemoryBufferRef mbref, StringRef symName,
StringRef parentName, uint64_t offsetInArchive);
void enqueueTask(std::function<void()> task);
bool run();
std::list<std::function<void()>> taskQueue;
std::vector<StringRef> filePaths;
std::vector<MemoryBufferRef> resources;
llvm::StringSet<> directivesExports;
COFFLinkerContext &ctx;
// Functions below this line are defined in DriverUtils.cpp.
void printHelp(const char *argv0);
// Parses a string in the form of "<integer>[,<integer>]".
void parseNumbers(StringRef arg, uint64_t *addr, uint64_t *size = nullptr);
void parseGuard(StringRef arg);
// Parses a string in the form of "<integer>[.<integer>]".
// Minor's default value is 0.
void parseVersion(StringRef arg, uint32_t *major, uint32_t *minor);
// Parses a string in the form of "<subsystem>[,<integer>[.<integer>]]".
void parseSubsystem(StringRef arg, WindowsSubsystem *sys, uint32_t *major,
uint32_t *minor, bool *gotVersion = nullptr);
void parseAlternateName(StringRef);
void parseMerge(StringRef);
void parsePDBPageSize(StringRef);
void parseSection(StringRef);
void parseAligncomm(StringRef);
// Parses a string in the form of "[:<integer>]"
void parseFunctionPadMin(llvm::opt::Arg *a, llvm::COFF::MachineTypes machine);
// Parses a string in the form of "EMBED[,=<integer>]|NO".
void parseManifest(StringRef arg);
// Parses a string in the form of "level=<string>|uiAccess=<string>"
void parseManifestUAC(StringRef arg);
// Parses a string in the form of "cd|net[,(cd|net)]*"
void parseSwaprun(StringRef arg);
// Create a resource file containing a manifest XML.
std::unique_ptr<MemoryBuffer> createManifestRes();
void createSideBySideManifest();
// Used for dllexported symbols.
Export parseExport(StringRef arg);
void fixupExports();
void assignExportOrdinals();
// Parses a string in the form of "key=value" and check
// if value matches previous values for the key.
// This feature used in the directive section to reject
// incompatible objects.
void checkFailIfMismatch(StringRef arg, InputFile *source);
// Convert Windows resource files (.res files) to a .obj file.
MemoryBufferRef convertResToCOFF(ArrayRef<MemoryBufferRef> mbs,
ArrayRef<ObjFile *> objs);
// Create enum with OPT_xxx values for each option in
enum {
#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
#include ""
#undef OPTION
} // namespace coff
} // namespace lld