forked from OSchip/llvm-project
458 lines
15 KiB
C++
458 lines
15 KiB
C++
//===- MinGW/Driver.cpp ---------------------------------------------------===//
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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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// MinGW is a GNU development environment for Windows. It consists of GNU
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// tools such as GCC and GNU ld. Unlike Cygwin, there's no POSIX-compatible
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// layer, as it aims to be a native development toolchain.
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//
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// lld/MinGW is a drop-in replacement for GNU ld/MinGW.
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//
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// Being a native development tool, a MinGW linker is not very different from
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// Microsoft link.exe, so a MinGW linker can be implemented as a thin wrapper
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// for lld/COFF. This driver takes Unix-ish command line options, translates
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// them to Windows-ish ones, and then passes them to lld/COFF.
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//
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// When this driver calls the lld/COFF driver, it passes a hidden option
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// "-lldmingw" along with other user-supplied options, to run the lld/COFF
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// linker in "MinGW mode".
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//
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// There are subtle differences between MS link.exe and GNU ld/MinGW, and GNU
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// ld/MinGW implements a few GNU-specific features. Such features are directly
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// implemented in lld/COFF and enabled only when the linker is running in MinGW
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// mode.
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//
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//===----------------------------------------------------------------------===//
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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/Version.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Triple.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/CommandLine.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/Path.h"
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#if !defined(_MSC_VER) && !defined(__MINGW32__)
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#include <unistd.h>
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#endif
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using namespace lld;
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using namespace llvm;
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// Create OptTable
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enum {
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OPT_INVALID = 0,
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#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
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#include "Options.inc"
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#undef OPTION
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};
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// Create prefix string literals used in Options.td
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#define PREFIX(NAME, VALUE) static const char *const NAME[] = VALUE;
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#include "Options.inc"
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#undef PREFIX
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// Create table mapping all options defined in Options.td
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static const opt::OptTable::Info infoTable[] = {
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#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12) \
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{X1, X2, X10, X11, OPT_##ID, opt::Option::KIND##Class, \
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X9, X8, OPT_##GROUP, OPT_##ALIAS, X7, X12},
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#include "Options.inc"
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#undef OPTION
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};
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namespace {
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class MinGWOptTable : public opt::OptTable {
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public:
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MinGWOptTable() : OptTable(infoTable, false) {}
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opt::InputArgList parse(ArrayRef<const char *> argv);
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};
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} // namespace
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static void printHelp(const char *argv0) {
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MinGWOptTable().printHelp(
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lld::outs(), (std::string(argv0) + " [options] file...").c_str(), "lld",
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false /*ShowHidden*/, true /*ShowAllAliases*/);
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lld::outs() << "\n";
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}
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static cl::TokenizerCallback getQuotingStyle() {
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if (Triple(sys::getProcessTriple()).getOS() == Triple::Win32)
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return cl::TokenizeWindowsCommandLine;
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return cl::TokenizeGNUCommandLine;
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}
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opt::InputArgList MinGWOptTable::parse(ArrayRef<const char *> argv) {
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unsigned missingIndex;
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unsigned missingCount;
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SmallVector<const char *, 256> vec(argv.data(), argv.data() + argv.size());
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cl::ExpandResponseFiles(saver(), getQuotingStyle(), vec);
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opt::InputArgList args = this->ParseArgs(vec, missingIndex, missingCount);
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if (missingCount)
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error(StringRef(args.getArgString(missingIndex)) + ": missing argument");
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for (auto *arg : args.filtered(OPT_UNKNOWN))
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error("unknown argument: " + arg->getAsString(args));
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return args;
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}
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// Find a file by concatenating given paths.
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static Optional<std::string> findFile(StringRef path1, const Twine &path2) {
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SmallString<128> s;
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sys::path::append(s, path1, path2);
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if (sys::fs::exists(s))
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return std::string(s);
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return None;
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}
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// This is for -lfoo. We'll look for libfoo.dll.a or libfoo.a from search paths.
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static std::string
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searchLibrary(StringRef name, ArrayRef<StringRef> searchPaths, bool bStatic) {
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if (name.startswith(":")) {
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for (StringRef dir : searchPaths)
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if (Optional<std::string> s = findFile(dir, name.substr(1)))
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return *s;
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error("unable to find library -l" + name);
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return "";
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}
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for (StringRef dir : searchPaths) {
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if (!bStatic) {
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if (Optional<std::string> s = findFile(dir, "lib" + name + ".dll.a"))
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return *s;
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if (Optional<std::string> s = findFile(dir, name + ".dll.a"))
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return *s;
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}
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if (Optional<std::string> s = findFile(dir, "lib" + name + ".a"))
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return *s;
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if (!bStatic) {
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if (Optional<std::string> s = findFile(dir, name + ".lib"))
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return *s;
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if (Optional<std::string> s = findFile(dir, "lib" + name + ".dll"))
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return *s;
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if (Optional<std::string> s = findFile(dir, name + ".dll"))
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return *s;
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}
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}
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error("unable to find library -l" + name);
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return "";
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}
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// Convert Unix-ish command line arguments to Windows-ish ones and
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// then call coff::link.
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bool mingw::link(ArrayRef<const char *> argsArr, llvm::raw_ostream &stdoutOS,
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llvm::raw_ostream &stderrOS, bool exitEarly,
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bool disableOutput) {
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auto *ctx = new CommonLinkerContext;
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ctx->e.initialize(stdoutOS, stderrOS, exitEarly, disableOutput);
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MinGWOptTable parser;
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opt::InputArgList args = parser.parse(argsArr.slice(1));
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if (errorCount())
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return false;
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if (args.hasArg(OPT_help)) {
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printHelp(argsArr[0]);
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return true;
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}
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// A note about "compatible with GNU linkers" message: this is a hack for
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// scripts generated by GNU Libtool 2.4.6 (released in February 2014 and
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// still the newest version in March 2017) or earlier to recognize LLD as
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// a GNU compatible linker. As long as an output for the -v option
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// contains "GNU" or "with BFD", they recognize us as GNU-compatible.
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if (args.hasArg(OPT_v) || args.hasArg(OPT_version))
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message(getLLDVersion() + " (compatible with GNU linkers)");
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// The behavior of -v or --version is a bit strange, but this is
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// needed for compatibility with GNU linkers.
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if (args.hasArg(OPT_v) && !args.hasArg(OPT_INPUT) && !args.hasArg(OPT_l))
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return true;
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if (args.hasArg(OPT_version))
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return true;
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if (!args.hasArg(OPT_INPUT) && !args.hasArg(OPT_l)) {
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error("no input files");
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return false;
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}
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std::vector<std::string> linkArgs;
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auto add = [&](const Twine &s) { linkArgs.push_back(s.str()); };
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add("lld-link");
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add("-lldmingw");
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if (auto *a = args.getLastArg(OPT_entry)) {
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StringRef s = a->getValue();
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if (args.getLastArgValue(OPT_m) == "i386pe" && s.startswith("_"))
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add("-entry:" + s.substr(1));
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else
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add("-entry:" + s);
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}
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if (args.hasArg(OPT_major_os_version, OPT_minor_os_version,
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OPT_major_subsystem_version, OPT_minor_subsystem_version)) {
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StringRef majOSVer = args.getLastArgValue(OPT_major_os_version, "6");
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StringRef minOSVer = args.getLastArgValue(OPT_minor_os_version, "0");
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StringRef majSubSysVer = "6";
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StringRef minSubSysVer = "0";
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StringRef subSysName = "default";
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StringRef subSysVer;
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// Iterate over --{major,minor}-subsystem-version and --subsystem, and pick
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// the version number components from the last one of them that specifies
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// a version.
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for (auto *a : args.filtered(OPT_major_subsystem_version,
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OPT_minor_subsystem_version, OPT_subs)) {
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switch (a->getOption().getID()) {
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case OPT_major_subsystem_version:
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majSubSysVer = a->getValue();
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break;
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case OPT_minor_subsystem_version:
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minSubSysVer = a->getValue();
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break;
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case OPT_subs:
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std::tie(subSysName, subSysVer) = StringRef(a->getValue()).split(':');
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if (!subSysVer.empty()) {
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if (subSysVer.contains('.'))
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std::tie(majSubSysVer, minSubSysVer) = subSysVer.split('.');
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else
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majSubSysVer = subSysVer;
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}
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break;
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}
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}
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add("-osversion:" + majOSVer + "." + minOSVer);
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add("-subsystem:" + subSysName + "," + majSubSysVer + "." + minSubSysVer);
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} else if (args.hasArg(OPT_subs)) {
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StringRef subSys = args.getLastArgValue(OPT_subs, "default");
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StringRef subSysName, subSysVer;
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std::tie(subSysName, subSysVer) = subSys.split(':');
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StringRef sep = subSysVer.empty() ? "" : ",";
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add("-subsystem:" + subSysName + sep + subSysVer);
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}
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if (auto *a = args.getLastArg(OPT_out_implib))
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add("-implib:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_stack))
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add("-stack:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_output_def))
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add("-output-def:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_image_base))
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add("-base:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_map))
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add("-lldmap:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_reproduce))
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add("-reproduce:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_thinlto_cache_dir))
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add("-lldltocache:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_file_alignment))
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add("-filealign:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_section_alignment))
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add("-align:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_heap))
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add("-heap:" + StringRef(a->getValue()));
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if (auto *a = args.getLastArg(OPT_o))
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add("-out:" + StringRef(a->getValue()));
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else if (args.hasArg(OPT_shared))
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add("-out:a.dll");
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else
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add("-out:a.exe");
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if (auto *a = args.getLastArg(OPT_pdb)) {
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add("-debug");
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StringRef v = a->getValue();
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if (!v.empty())
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add("-pdb:" + v);
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} else if (args.hasArg(OPT_strip_debug)) {
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add("-debug:symtab");
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} else if (!args.hasArg(OPT_strip_all)) {
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add("-debug:dwarf");
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}
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if (args.hasFlag(OPT_fatal_warnings, OPT_no_fatal_warnings, false))
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add("-WX");
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else
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add("-WX:no");
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if (args.hasFlag(OPT_enable_stdcall_fixup, OPT_disable_stdcall_fixup, false))
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add("-stdcall-fixup");
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else if (args.hasArg(OPT_disable_stdcall_fixup))
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add("-stdcall-fixup:no");
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if (args.hasArg(OPT_shared))
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add("-dll");
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if (args.hasArg(OPT_verbose))
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add("-verbose");
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if (args.hasArg(OPT_exclude_all_symbols))
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add("-exclude-all-symbols");
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if (args.hasArg(OPT_export_all_symbols))
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add("-export-all-symbols");
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if (args.hasArg(OPT_large_address_aware))
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add("-largeaddressaware");
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if (args.hasArg(OPT_kill_at))
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add("-kill-at");
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if (args.hasArg(OPT_appcontainer))
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add("-appcontainer");
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if (args.hasFlag(OPT_no_seh, OPT_disable_no_seh, false))
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add("-noseh");
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if (args.getLastArgValue(OPT_m) != "thumb2pe" &&
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args.getLastArgValue(OPT_m) != "arm64pe" &&
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args.hasFlag(OPT_disable_dynamicbase, OPT_dynamicbase, false))
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add("-dynamicbase:no");
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if (args.hasFlag(OPT_disable_high_entropy_va, OPT_high_entropy_va, false))
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add("-highentropyva:no");
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if (args.hasFlag(OPT_disable_nxcompat, OPT_nxcompat, false))
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add("-nxcompat:no");
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if (args.hasFlag(OPT_disable_tsaware, OPT_tsaware, false))
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add("-tsaware:no");
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if (args.hasFlag(OPT_disable_reloc_section, OPT_enable_reloc_section, false))
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add("-fixed");
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if (args.hasFlag(OPT_no_insert_timestamp, OPT_insert_timestamp, false))
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add("-timestamp:0");
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if (args.hasFlag(OPT_gc_sections, OPT_no_gc_sections, false))
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add("-opt:ref");
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else
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add("-opt:noref");
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if (args.hasFlag(OPT_demangle, OPT_no_demangle, true))
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add("-demangle");
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else
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add("-demangle:no");
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if (args.hasFlag(OPT_enable_auto_import, OPT_disable_auto_import, true))
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add("-auto-import");
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else
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add("-auto-import:no");
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if (args.hasFlag(OPT_enable_runtime_pseudo_reloc,
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OPT_disable_runtime_pseudo_reloc, true))
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add("-runtime-pseudo-reloc");
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else
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add("-runtime-pseudo-reloc:no");
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if (args.hasFlag(OPT_allow_multiple_definition,
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OPT_no_allow_multiple_definition, false))
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add("-force:multiple");
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if (auto *a = args.getLastArg(OPT_icf)) {
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StringRef s = a->getValue();
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if (s == "all")
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add("-opt:icf");
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else if (s == "safe" || s == "none")
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add("-opt:noicf");
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else
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error("unknown parameter: --icf=" + s);
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} else {
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add("-opt:noicf");
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}
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if (auto *a = args.getLastArg(OPT_m)) {
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StringRef s = a->getValue();
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if (s == "i386pe")
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add("-machine:x86");
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else if (s == "i386pep")
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add("-machine:x64");
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else if (s == "thumb2pe")
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add("-machine:arm");
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else if (s == "arm64pe")
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add("-machine:arm64");
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else
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error("unknown parameter: -m" + s);
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}
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for (auto *a : args.filtered(OPT_mllvm))
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add("-mllvm:" + StringRef(a->getValue()));
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for (auto *a : args.filtered(OPT_Xlink))
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add(a->getValue());
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if (args.getLastArgValue(OPT_m) == "i386pe")
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add("-alternatename:__image_base__=___ImageBase");
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else
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add("-alternatename:__image_base__=__ImageBase");
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for (auto *a : args.filtered(OPT_require_defined))
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add("-include:" + StringRef(a->getValue()));
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for (auto *a : args.filtered(OPT_undefined))
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add("-includeoptional:" + StringRef(a->getValue()));
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for (auto *a : args.filtered(OPT_delayload))
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add("-delayload:" + StringRef(a->getValue()));
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for (auto *a : args.filtered(OPT_wrap))
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add("-wrap:" + StringRef(a->getValue()));
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std::vector<StringRef> searchPaths;
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for (auto *a : args.filtered(OPT_L)) {
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searchPaths.push_back(a->getValue());
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add("-libpath:" + StringRef(a->getValue()));
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}
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StringRef prefix = "";
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bool isStatic = false;
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for (auto *a : args) {
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switch (a->getOption().getID()) {
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case OPT_INPUT:
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if (StringRef(a->getValue()).endswith_insensitive(".def"))
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add("-def:" + StringRef(a->getValue()));
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else
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add(prefix + StringRef(a->getValue()));
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break;
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case OPT_l:
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add(prefix + searchLibrary(a->getValue(), searchPaths, isStatic));
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break;
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case OPT_whole_archive:
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prefix = "-wholearchive:";
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break;
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case OPT_no_whole_archive:
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prefix = "";
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break;
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case OPT_Bstatic:
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isStatic = true;
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break;
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case OPT_Bdynamic:
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isStatic = false;
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break;
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}
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}
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if (errorCount())
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return false;
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if (args.hasArg(OPT_verbose) || args.hasArg(OPT__HASH_HASH_HASH))
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lld::errs() << llvm::join(linkArgs, " ") << "\n";
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if (args.hasArg(OPT__HASH_HASH_HASH))
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return true;
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// Repack vector of strings to vector of const char pointers for coff::link.
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std::vector<const char *> vec;
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for (const std::string &s : linkArgs)
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vec.push_back(s.c_str());
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// Pass the actual binary name, to make error messages be printed with
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// the right prefix.
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vec[0] = argsArr[0];
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// The context will be re-created in the COFF driver.
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lld::CommonLinkerContext::destroy();
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return coff::link(vec, stdoutOS, stderrOS, exitEarly, disableOutput);
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}
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