CbC/CbC_llvm: lld/MachO/Driver.cpp comparison

comparison lld/MachO/Driver.cpp @ 207:2e18cbf3894f

LLVM12

author	Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date	Tue, 08 Jun 2021 06:07:14 +0900
parents	0572611fdcc8
children	5f17cb93ff66

comparison

equal deleted inserted replaced

-:0572611fdcc8
+:2e18cbf3894f
 //===----------------------------------------------------------------------===//
 #include "Driver.h"
 #include "Config.h"
 #include "InputFiles.h"
+#include "LTO.h"
+#include "MarkLive.h"
+#include "ObjC.h"
 #include "OutputSection.h"
 #include "OutputSegment.h"
 #include "SymbolTable.h"
 #include "Symbols.h"
+#include "SyntheticSections.h"
 #include "Target.h"
 #include "Writer.h"
 #include "lld/Common/Args.h"
 #include "lld/Common/Driver.h"
 #include "lld/Common/ErrorHandler.h"
 #include "lld/Common/LLVM.h"
 #include "lld/Common/Memory.h"
+#include "lld/Common/Reproduce.h"
 #include "lld/Common/Version.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/BinaryFormat/MachO.h"
 #include "llvm/BinaryFormat/Magic.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/LTO/LTO.h"
 #include "llvm/Object/Archive.h"
 #include "llvm/Option/ArgList.h"
-#include "llvm/Option/Option.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Parallel.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/TarWriter.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/TimeProfiler.h"
+#include "llvm/TextAPI/PackedVersion.h"
+#include <algorithm>
 using namespace llvm;
 using namespace llvm::MachO;
+using namespace llvm::object;
+using namespace llvm::opt;
 using namespace llvm::sys;
 using namespace lld;
 using namespace lld::macho;
-Configuration *lld::macho::config;
+Configuration *macho::config;
+DependencyTracker *macho::depTracker;
-// Create prefix string literals used in Options.td
-#define PREFIX(NAME, VALUE) const char *NAME[] = VALUE;
+static HeaderFileType getOutputType(const InputArgList &args) {
-#include "Options.inc"
+// TODO: -r, -dylinker, -preload...
-#undef PREFIX
+Arg *outputArg = args.getLastArg(OPT_bundle, OPT_dylib, OPT_execute);
+if (outputArg == nullptr)
-// Create table mapping all options defined in Options.td
+return MH_EXECUTE;
-static const opt::OptTable::Info optInfo[] = {
-#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12)      \
+switch (outputArg->getOption().getID()) {
-{X1, X2, X10,         X11,         OPT_##ID, opt::Option::KIND##Class,       \
+case OPT_bundle:
-X9, X8, OPT_##GROUP, OPT_##ALIAS, X7,       X12},
+return MH_BUNDLE;
-#include "Options.inc"
+case OPT_dylib:
-#undef OPTION
+return MH_DYLIB;
+case OPT_execute:
+return MH_EXECUTE;
+default:
+llvm_unreachable("internal error");
+}
+}
+static Optional<StringRef> findLibrary(StringRef name) {
+if (config->searchDylibsFirst) {
+if (Optional<StringRef> path = findPathCombination(
+"lib" + name, config->librarySearchPaths, {".tbd", ".dylib"}))
+return path;
+return findPathCombination("lib" + name, config->librarySearchPaths,
+{".a"});
+}
+return findPathCombination("lib" + name, config->librarySearchPaths,
+{".tbd", ".dylib", ".a"});
+}
+static Optional<std::string> findFramework(StringRef name) {
+SmallString<260> symlink;
+StringRef suffix;
+std::tie(name, suffix) = name.split(",");
+for (StringRef dir : config->frameworkSearchPaths) {
+symlink = dir;
+path::append(symlink, name + ".framework", name);
+if (!suffix.empty()) {
+// NOTE: we must resolve the symlink before trying the suffixes, because
+// there are no symlinks for the suffixed paths.
+SmallString<260> location;
+if (!fs::real_path(symlink, location)) {
+// only append suffix if realpath() succeeds
+Twine suffixed = location + suffix;
+if (fs::exists(suffixed))
+return suffixed.str();
+}
+// Suffix lookup failed, fall through to the no-suffix case.
+}
+if (Optional<std::string> path = resolveDylibPath(symlink))
+return path;
+}
+return {};
+}
+static bool warnIfNotDirectory(StringRef option, StringRef path) {
+if (!fs::exists(path)) {
+warn("directory not found for option -" + option + path);
+return false;
+} else if (!fs::is_directory(path)) {
+warn("option -" + option + path + " references a non-directory path");
+return false;
+}
+return true;
+}
+static std::vector<StringRef>
+getSearchPaths(unsigned optionCode, InputArgList &args,
+const std::vector<StringRef> &roots,
+const SmallVector<StringRef, 2> &systemPaths) {
+std::vector<StringRef> paths;
+StringRef optionLetter{optionCode == OPT_F ? "F" : "L"};
+for (StringRef path : args::getStrings(args, optionCode)) {
+// NOTE: only absolute paths are re-rooted to syslibroot(s)
+bool found = false;
+if (path::is_absolute(path, path::Style::posix)) {
+for (StringRef root : roots) {
+SmallString<261> buffer(root);
+path::append(buffer, path);
+// Do not warn about paths that are computed via the syslib roots
+if (fs::is_directory(buffer)) {
+paths.push_back(saver.save(buffer.str()));
+found = true;
+}
+}
+}
+if (!found && warnIfNotDirectory(optionLetter, path))
+paths.push_back(path);
+}
+// `-Z` suppresses the standard "system" search paths.
+if (args.hasArg(OPT_Z))
+return paths;
+for (const StringRef &path : systemPaths) {
+for (const StringRef &root : roots) {
+SmallString<261> buffer(root);
+path::append(buffer, path);
+if (fs::is_directory(buffer))
+paths.push_back(saver.save(buffer.str()));
+}
+}
+return paths;
+}
+static std::vector<StringRef> getSystemLibraryRoots(InputArgList &args) {
+std::vector<StringRef> roots;
+for (const Arg *arg : args.filtered(OPT_syslibroot))
+roots.push_back(arg->getValue());
+// NOTE: the final `-syslibroot` being `/` will ignore all roots
+if (roots.size() && roots.back() == "/")
+roots.clear();
+// NOTE: roots can never be empty - add an empty root to simplify the library
+// and framework search path computation.
+if (roots.empty())
+roots.emplace_back("");
+return roots;
+}
+static std::vector<StringRef>
+getLibrarySearchPaths(InputArgList &args, const std::vector<StringRef> &roots) {
+return getSearchPaths(OPT_L, args, roots, {"/usr/lib", "/usr/local/lib"});
+}
+static std::vector<StringRef>
+getFrameworkSearchPaths(InputArgList &args,
+const std::vector<StringRef> &roots) {
+return getSearchPaths(OPT_F, args, roots,
+{"/Library/Frameworks", "/System/Library/Frameworks"});
+}
+namespace {
+struct ArchiveMember {
+MemoryBufferRef mbref;
+uint32_t modTime;
 };
+} // namespace
-MachOOptTable::MachOOptTable() : OptTable(optInfo) {}
+// Returns slices of MB by parsing MB as an archive file.
-opt::InputArgList MachOOptTable::parse(ArrayRef<const char *> argv) {
+// Each slice consists of a member file in the archive.
-// Make InputArgList from string vectors.
+static std::vector<ArchiveMember> getArchiveMembers(MemoryBufferRef mb) {
-unsigned missingIndex;
+std::unique_ptr<Archive> file =
-unsigned missingCount;
+CHECK(Archive::create(mb),
-SmallVector<const char *, 256> vec(argv.data(), argv.data() + argv.size());
+mb.getBufferIdentifier() + ": failed to parse archive");
+Archive *archive = file.get();
-opt::InputArgList args = ParseArgs(vec, missingIndex, missingCount);
+make<std::unique_ptr<Archive>>(std::move(file)); // take ownership
+std::vector<ArchiveMember> v;
+Error err = Error::success();
+// Thin archives refer to .o files, so --reproduce needs the .o files too.
+bool addToTar = archive->isThin() && tar;
+for (const Archive::Child &c : archive->children(err)) {
+MemoryBufferRef mbref =
+CHECK(c.getMemoryBufferRef(),
+mb.getBufferIdentifier() +
+": could not get the buffer for a child of the archive");
+if (addToTar)
+tar->append(relativeToRoot(check(c.getFullName())), mbref.getBuffer());
+uint32_t modTime = toTimeT(
+CHECK(c.getLastModified(), mb.getBufferIdentifier() +
+": could not get the modification "
+"time for a child of the archive"));
+v.push_back({mbref, modTime});
+}
+if (err)
+fatal(mb.getBufferIdentifier() +
+": Archive::children failed: " + toString(std::move(err)));
+return v;
+}
+static InputFile *addFile(StringRef path, bool forceLoadArchive,
+bool isExplicit = true,
+bool isBundleLoader = false) {
+Optional<MemoryBufferRef> buffer = readFile(path);
+if (!buffer)
+return nullptr;
+MemoryBufferRef mbref = *buffer;
+InputFile *newFile = nullptr;
+file_magic magic = identify_magic(mbref.getBuffer());
+switch (magic) {
+case file_magic::archive: {
+std::unique_ptr<object::Archive> file = CHECK(
+object::Archive::create(mbref), path + ": failed to parse archive");
+if (!file->isEmpty() && !file->hasSymbolTable())
+error(path + ": archive has no index; run ranlib to add one");
+if (config->allLoad || forceLoadArchive) {
+if (Optional<MemoryBufferRef> buffer = readFile(path)) {
+for (const ArchiveMember &member : getArchiveMembers(*buffer)) {
+if (Optional<InputFile *> file = loadArchiveMember(
+member.mbref, member.modTime, path, /*objCOnly=*/false)) {
+inputFiles.insert(*file);
+printArchiveMemberLoad(
+(forceLoadArchive ? "-force_load" : "-all_load"),
+inputFiles.back());
+}
+}
+}
+} else if (config->forceLoadObjC) {
+for (const object::Archive::Symbol &sym : file->symbols())
+if (sym.getName().startswith(objc::klass))
+symtab->addUndefined(sym.getName(), /*file=*/nullptr,
+/*isWeakRef=*/false);
+// TODO: no need to look for ObjC sections for a given archive member if
+// we already found that it contains an ObjC symbol. We should also
+// consider creating a LazyObjFile class in order to avoid double-loading
+// these files here and below (as part of the ArchiveFile).
+if (Optional<MemoryBufferRef> buffer = readFile(path)) {
+for (const ArchiveMember &member : getArchiveMembers(*buffer)) {
+if (Optional<InputFile *> file = loadArchiveMember(
+member.mbref, member.modTime, path, /*objCOnly=*/true)) {
+inputFiles.insert(*file);
+printArchiveMemberLoad("-ObjC", inputFiles.back());
+}
+}
+}
+}
+newFile = make<ArchiveFile>(std::move(file));
+break;
+}
+case file_magic::macho_object:
+newFile = make<ObjFile>(mbref, getModTime(path), "");
+break;
+case file_magic::macho_dynamically_linked_shared_lib:
+case file_magic::macho_dynamically_linked_shared_lib_stub:
+case file_magic::tapi_file:
+if (DylibFile * dylibFile = loadDylib(mbref)) {
+if (isExplicit)
+dylibFile->explicitlyLinked = true;
+newFile = dylibFile;
+}
+break;
+case file_magic::bitcode:
+newFile = make<BitcodeFile>(mbref);
+break;
+case file_magic::macho_executable:
+case file_magic::macho_bundle:
+// We only allow executable and bundle type here if it is used
+// as a bundle loader.
+if (!isBundleLoader)
+error(path + ": unhandled file type");
+if (DylibFile *dylibFile = loadDylib(mbref, nullptr, isBundleLoader))
+newFile = dylibFile;
+break;
+default:
+error(path + ": unhandled file type");
+}
+if (newFile) {
+// printArchiveMemberLoad() prints both .a and .o names, so no need to
+// print the .a name here.
+if (config->printEachFile && magic != file_magic::archive &&
+!isa<DylibFile>(newFile))
+message(toString(newFile));
+inputFiles.insert(newFile);
+}
+return newFile;
+}
+static void addLibrary(StringRef name, bool isNeeded, bool isWeak,
+bool isReexport, bool isExplicit) {
+if (Optional<StringRef> path = findLibrary(name)) {
+if (auto *dylibFile = dyn_cast_or_null<DylibFile>(
+addFile(*path, /*forceLoadArchive=*/false, isExplicit))) {
+if (isNeeded)
+dylibFile->forceNeeded = true;
+if (isWeak)
+dylibFile->forceWeakImport = true;
+if (isReexport) {
+config->hasReexports = true;
+dylibFile->reexport = true;
+}
+}
+return;
+}
+error("library not found for -l" + name);
+}
+static void addFramework(StringRef name, bool isNeeded, bool isWeak,
+bool isReexport, bool isExplicit) {
+if (Optional<std::string> path = findFramework(name)) {
+if (auto *dylibFile = dyn_cast_or_null<DylibFile>(
+addFile(*path, /*forceLoadArchive=*/false, isExplicit))) {
+if (isNeeded)
+dylibFile->forceNeeded = true;
+if (isWeak)
+dylibFile->forceWeakImport = true;
+if (isReexport) {
+config->hasReexports = true;
+dylibFile->reexport = true;
+}
+}
+return;
+}
+error("framework not found for -framework " + name);
+}
+// Parses LC_LINKER_OPTION contents, which can add additional command line
+// flags.
+void macho::parseLCLinkerOption(InputFile *f, unsigned argc, StringRef data) {
+SmallVector<const char *, 4> argv;
+size_t offset = 0;
+for (unsigned i = 0; i < argc && offset < data.size(); ++i) {
+argv.push_back(data.data() + offset);
+offset += strlen(data.data() + offset) + 1;
+}
+if (argv.size() != argc || offset > data.size())
+fatal(toString(f) + ": invalid LC_LINKER_OPTION");
+MachOOptTable table;
+unsigned missingIndex, missingCount;
+InputArgList args = table.ParseArgs(argv, missingIndex, missingCount);
 if (missingCount)
-error(Twine(args.getArgString(missingIndex)) + ": missing argument");
+fatal(Twine(args.getArgString(missingIndex)) + ": missing argument");
+for (const Arg *arg : args.filtered(OPT_UNKNOWN))
-for (opt::Arg *arg : args.filtered(OPT_UNKNOWN))
+error("unknown argument: " + arg->getAsString(args));
-error("unknown argument: " + arg->getSpelling());
-return args;
+for (const Arg *arg : args) {
-}
+switch (arg->getOption().getID()) {
+case OPT_l:
-// This is for -lfoo. We'll look for libfoo.dylib from search paths.
+addLibrary(arg->getValue(), /*isNeeded=*/false, /*isWeak=*/false,
-static Optional<std::string> findDylib(StringRef name) {
+/*isReexport=*/false, /*isExplicit=*/false);
-for (StringRef dir : config->searchPaths) {
+break;
-std::string path = (dir + "/lib" + name + ".dylib").str();
+case OPT_framework:
-if (fs::exists(path))
+addFramework(arg->getValue(), /*isNeeded=*/false, /*isWeak=*/false,
-return path;
+/*isReexport=*/false, /*isExplicit=*/false);
-}
+break;
-error("library not found for -l" + name);
+default:
-return None;
+error(arg->getSpelling() + " is not allowed in LC_LINKER_OPTION");
 }
+}
-static TargetInfo *createTargetInfo(opt::InputArgList &args) {
+}
-StringRef s = args.getLastArgValue(OPT_arch, "x86_64");
-if (s != "x86_64")
+static void addFileList(StringRef path) {
-error("missing or unsupported -arch " + s);
-return createX86_64TargetInfo();
-}
-static std::vector<StringRef> getSearchPaths(opt::InputArgList &args) {
-std::vector<StringRef> ret{args::getStrings(args, OPT_L)};
-if (!args.hasArg(OPT_Z)) {
-ret.push_back("/usr/lib");
-ret.push_back("/usr/local/lib");
-}
-return ret;
-}
-static void addFile(StringRef path) {
 Optional<MemoryBufferRef> buffer = readFile(path);
 if (!buffer)
 return;
 MemoryBufferRef mbref = *buffer;
+for (StringRef path : args::getLines(mbref))
-switch (identify_magic(mbref.getBuffer())) {
+addFile(rerootPath(path), /*forceLoadArchive=*/false);
-case file_magic::archive: {
-std::unique_ptr<object::Archive> file = CHECK(
-object::Archive::create(mbref), path + ": failed to parse archive");
-if (!file->isEmpty() && !file->hasSymbolTable())
-error(path + ": archive has no index; run ranlib to add one");
-inputFiles.push_back(make<ArchiveFile>(std::move(file)));
-break;
-}
-case file_magic::macho_object:
-inputFiles.push_back(make<ObjFile>(mbref));
-break;
-case file_magic::macho_dynamically_linked_shared_lib:
-inputFiles.push_back(make<DylibFile>(mbref));
-break;
-default:
-error(path + ": unhandled file type");
-}
-}
-static std::array<StringRef, 6> archNames{"arm",    "arm64", "i386",
-"x86_64", "ppc",   "ppc64"};
-static bool isArchString(StringRef s) {
-static DenseSet<StringRef> archNamesSet(archNames.begin(), archNames.end());
-return archNamesSet.find(s) != archNamesSet.end();
 }
 // An order file has one entry per line, in the following format:
 //
-//   <arch>:<object file>:<symbol name>
+//   <cpu>:<object file>:<symbol name>
 //
-// <arch> and <object file> are optional. If not specified, then that entry
+// <cpu> and <object file> are optional. If not specified, then that entry
-// matches any symbol of that name.
+// matches any symbol of that name. Parsing this format is not quite
+// straightforward because the symbol name itself can contain colons, so when
+// encountering a colon, we consider the preceding characters to decide if it
+// can be a valid CPU type or file path.
 //
 // If a symbol is matched by multiple entries, then it takes the lowest-ordered
 // entry (the one nearest to the front of the list.)
 //
 // The file can also have line comments that start with '#'.
-void parseOrderFile(StringRef path) {
+static void parseOrderFile(StringRef path) {
 Optional<MemoryBufferRef> buffer = readFile(path);
 if (!buffer) {
 error("Could not read order file at " + path);
 return;
 }
 MemoryBufferRef mbref = *buffer;
 size_t priority = std::numeric_limits<size_t>::max();
-for (StringRef rest : args::getLines(mbref)) {
+for (StringRef line : args::getLines(mbref)) {
-StringRef arch, objectFile, symbol;
+StringRef objectFile, symbol;
+line = line.take_until([](char c) { return c == '#'; }); // ignore comments
-std::array<StringRef, 3> fields;
+line = line.ltrim();
-uint8_t fieldCount = 0;
-while (rest != "" && fieldCount < 3) {
+CPUType cpuType = StringSwitch<CPUType>(line)
-std::pair<StringRef, StringRef> p = getToken(rest, ": \t\n\v\f\r");
+.StartsWith("i386:", CPU_TYPE_I386)
-StringRef tok = p.first;
+.StartsWith("x86_64:", CPU_TYPE_X86_64)
-rest = p.second;
+.StartsWith("arm:", CPU_TYPE_ARM)
+.StartsWith("arm64:", CPU_TYPE_ARM64)
-// Check if we have a comment
+.StartsWith("ppc:", CPU_TYPE_POWERPC)
-if (tok == "" || tok[0] == '#')
+.StartsWith("ppc64:", CPU_TYPE_POWERPC64)
+.Default(CPU_TYPE_ANY);
+if (cpuType != CPU_TYPE_ANY && cpuType != target->cpuType)
+continue;
+// Drop the CPU type as well as the colon
+if (cpuType != CPU_TYPE_ANY)
+line = line.drop_until([](char c) { return c == ':'; }).drop_front();
+constexpr std::array<StringRef, 2> fileEnds = {".o:", ".o):"};
+for (StringRef fileEnd : fileEnds) {
+size_t pos = line.find(fileEnd);
+if (pos != StringRef::npos) {
+// Split the string around the colon
+objectFile = line.take_front(pos + fileEnd.size() - 1);
+line = line.drop_front(pos + fileEnd.size());
 break;
-fields[fieldCount++] = tok;
-}
-switch (fieldCount) {
-case 3:
-arch = fields[0];
-objectFile = fields[1];
-symbol = fields[2];
-break;
-case 2:
-(isArchString(fields[0]) ? arch : objectFile) = fields[0];
-symbol = fields[1];
-break;
-case 1:
-symbol = fields[0];
-break;
-case 0:
-break;
-default:
-llvm_unreachable("too many fields in order file");
-}
-if (!arch.empty()) {
-if (!isArchString(arch)) {
-error("invalid arch \"" + arch + "\" in order file: expected one of " +
-llvm::join(archNames, ", "));
-continue;
 }
+}
-// TODO: Update when we extend support for other archs
+symbol = line.trim();
-if (arch != "x86_64")
-continue;
-}
-if (!objectFile.empty() && !objectFile.endswith(".o")) {
-error("invalid object file name \"" + objectFile +
-"\" in order file: should end with .o");
-continue;
-}
 if (!symbol.empty()) {
 SymbolPriorityEntry &entry = config->priorities[symbol];
 if (!objectFile.empty())
 entry.objectFiles.insert(std::make_pair(objectFile, priority));
 --priority;
 }
 }
 // We expect sub-library names of the form "libfoo", which will match a dylib
-// with a path of .*/libfoo.dylib.
+// with a path of .*/libfoo.{dylib, tbd}.
-static bool markSubLibrary(StringRef searchName) {
+// XXX ld64 seems to ignore the extension entirely when matching sub-libraries;
+// I'm not sure what the use case for that is.
+static bool markReexport(StringRef searchName, ArrayRef<StringRef> extensions) {
 for (InputFile *file : inputFiles) {
 if (auto *dylibFile = dyn_cast<DylibFile>(file)) {
 StringRef filename = path::filename(dylibFile->getName());
-if (filename.consume_front(searchName) && filename == ".dylib") {
+if (filename.consume_front(searchName) &&
+(filename.empty() ||
+find(extensions, filename) != extensions.end())) {
 dylibFile->reexport = true;
 return true;
 }
 }
 }
 return false;
 }
-static void handlePlatformVersion(opt::ArgList::iterator &it,
+// This function is called on startup. We need this for LTO since
-const opt::ArgList::iterator &end) {
+// LTO calls LLVM functions to compile bitcode files to native code.
-// -platform_version takes 3 args, which LLVM's option library doesn't
+// Technically this can be delayed until we read bitcode files, but
-// support directly.  So this explicitly handles that.
+// we don't bother to do lazily because the initialization is fast.
-// FIXME: stash skipped args for later use.
+static void initLLVM() {
-for (int i = 0; i < 3; ++i) {
+InitializeAllTargets();
-++it;
+InitializeAllTargetMCs();
-if (it == end || (*it)->getOption().getID() != OPT_INPUT)
+InitializeAllAsmPrinters();
-fatal("usage: -platform_version platform min_version sdk_version");
+InitializeAllAsmParsers();
 }
-}
+static void compileBitcodeFiles() {
-bool macho::link(llvm::ArrayRef<const char *> argsArr, bool canExitEarly,
+TimeTraceScope timeScope("LTO");
+auto *lto = make<BitcodeCompiler>();
+for (InputFile *file : inputFiles)
+if (auto *bitcodeFile = dyn_cast<BitcodeFile>(file))
+lto->add(*bitcodeFile);
+for (ObjFile *file : lto->compile())
+inputFiles.insert(file);
+}
+// Replaces common symbols with defined symbols residing in __common sections.
+// This function must be called after all symbol names are resolved (i.e. after
+// all InputFiles have been loaded.) As a result, later operations won't see
+// any CommonSymbols.
+static void replaceCommonSymbols() {
+TimeTraceScope timeScope("Replace common symbols");
+for (Symbol *sym : symtab->getSymbols()) {
+auto *common = dyn_cast<CommonSymbol>(sym);
+if (common == nullptr)
+continue;
+auto *isec = make<InputSection>();
+isec->file = common->getFile();
+isec->name = section_names::common;
+isec->segname = segment_names::data;
+isec->align = common->align;
+// Casting to size_t will truncate large values on 32-bit architectures,
+// but it's not really worth supporting the linking of 64-bit programs on
+// 32-bit archs.
+isec->data = {nullptr, static_cast<size_t>(common->size)};
+isec->flags = S_ZEROFILL;
+inputSections.push_back(isec);
+// FIXME: CommonSymbol should store isReferencedDynamically, noDeadStrip
+// and pass them on here.
+replaceSymbol<Defined>(sym, sym->getName(), isec->file, isec, /*value=*/0,
+/*size=*/0,
+/*isWeakDef=*/false,
+/*isExternal=*/true, common->privateExtern,
+/*isThumb=*/false,
+/*isReferencedDynamically=*/false,
+/*noDeadStrip=*/false);
+}
+}
+static void initializeSectionRenameMap() {
+if (config->dataConst) {
+SmallVector<StringRef> v{section_names::got,
+section_names::authGot,
+section_names::authPtr,
+section_names::nonLazySymbolPtr,
+section_names::const_,
+section_names::cfString,
+section_names::moduleInitFunc,
+section_names::moduleTermFunc,
+section_names::objcClassList,
+section_names::objcNonLazyClassList,
+section_names::objcCatList,
+section_names::objcNonLazyCatList,
+section_names::objcProtoList,
+section_names::objcImageInfo};
+for (StringRef s : v)
+config->sectionRenameMap[{segment_names::data, s}] = {
+segment_names::dataConst, s};
+}
+config->sectionRenameMap[{segment_names::text, section_names::staticInit}] = {
+segment_names::text, section_names::text};
+config->sectionRenameMap[{segment_names::import, section_names::pointers}] = {
+config->dataConst ? segment_names::dataConst : segment_names::data,
+section_names::nonLazySymbolPtr};
+}
+static inline char toLowerDash(char x) {
+if (x >= 'A' && x <= 'Z')
+return x - 'A' + 'a';
+else if (x == ' ')
+return '-';
+return x;
+}
+static std::string lowerDash(StringRef s) {
+return std::string(map_iterator(s.begin(), toLowerDash),
+map_iterator(s.end(), toLowerDash));
+}
+// Has the side-effect of setting Config::platformInfo.
+static PlatformKind parsePlatformVersion(const ArgList &args) {
+const Arg *arg = args.getLastArg(OPT_platform_version);
+if (!arg) {
+error("must specify -platform_version");
+return PlatformKind::unknown;
+}
+StringRef platformStr = arg->getValue(0);
+StringRef minVersionStr = arg->getValue(1);
+StringRef sdkVersionStr = arg->getValue(2);
+// TODO(compnerd) see if we can generate this case list via XMACROS
+PlatformKind platform =
+StringSwitch<PlatformKind>(lowerDash(platformStr))
+.Cases("macos", "1", PlatformKind::macOS)
+.Cases("ios", "2", PlatformKind::iOS)
+.Cases("tvos", "3", PlatformKind::tvOS)
+.Cases("watchos", "4", PlatformKind::watchOS)
+.Cases("bridgeos", "5", PlatformKind::bridgeOS)
+.Cases("mac-catalyst", "6", PlatformKind::macCatalyst)
+.Cases("ios-simulator", "7", PlatformKind::iOSSimulator)
+.Cases("tvos-simulator", "8", PlatformKind::tvOSSimulator)
+.Cases("watchos-simulator", "9", PlatformKind::watchOSSimulator)
+.Cases("driverkit", "10", PlatformKind::driverKit)
+.Default(PlatformKind::unknown);
+if (platform == PlatformKind::unknown)
+error(Twine("malformed platform: ") + platformStr);
+// TODO: check validity of version strings, which varies by platform
+// NOTE: ld64 accepts version strings with 5 components
+// llvm::VersionTuple accepts no more than 4 components
+// Has Apple ever published version strings with 5 components?
+if (config->platformInfo.minimum.tryParse(minVersionStr))
+error(Twine("malformed minimum version: ") + minVersionStr);
+if (config->platformInfo.sdk.tryParse(sdkVersionStr))
+error(Twine("malformed sdk version: ") + sdkVersionStr);
+return platform;
+}
+// Has the side-effect of setting Config::target.
+static TargetInfo *createTargetInfo(InputArgList &args) {
+StringRef archName = args.getLastArgValue(OPT_arch);
+if (archName.empty())
+fatal("must specify -arch");
+PlatformKind platform = parsePlatformVersion(args);
+config->platformInfo.target =
+MachO::Target(getArchitectureFromName(archName), platform);
+uint32_t cpuType;
+uint32_t cpuSubtype;
+std::tie(cpuType, cpuSubtype) = getCPUTypeFromArchitecture(config->arch());
+switch (cpuType) {
+case CPU_TYPE_X86_64:
+return createX86_64TargetInfo();
+case CPU_TYPE_ARM64:
+return createARM64TargetInfo();
+case CPU_TYPE_ARM64_32:
+return createARM64_32TargetInfo();
+case CPU_TYPE_ARM:
+return createARMTargetInfo(cpuSubtype);
+default:
+fatal("missing or unsupported -arch " + archName);
+}
+}
+static UndefinedSymbolTreatment
+getUndefinedSymbolTreatment(const ArgList &args) {
+StringRef treatmentStr = args.getLastArgValue(OPT_undefined);
+auto treatment =
+StringSwitch<UndefinedSymbolTreatment>(treatmentStr)
+.Cases("error", "", UndefinedSymbolTreatment::error)
+.Case("warning", UndefinedSymbolTreatment::warning)
+.Case("suppress", UndefinedSymbolTreatment::suppress)
+.Case("dynamic_lookup", UndefinedSymbolTreatment::dynamic_lookup)
+.Default(UndefinedSymbolTreatment::unknown);
+if (treatment == UndefinedSymbolTreatment::unknown) {
+warn(Twine("unknown -undefined TREATMENT '") + treatmentStr +
+"', defaulting to 'error'");
+treatment = UndefinedSymbolTreatment::error;
+} else if (config->namespaceKind == NamespaceKind::twolevel &&
+(treatment == UndefinedSymbolTreatment::warning ||
+treatment == UndefinedSymbolTreatment::suppress)) {
+if (treatment == UndefinedSymbolTreatment::warning)
+error("'-undefined warning' only valid with '-flat_namespace'");
+else
+error("'-undefined suppress' only valid with '-flat_namespace'");
+treatment = UndefinedSymbolTreatment::error;
+}
+return treatment;
+}
+static void warnIfDeprecatedOption(const Option &opt) {
+if (!opt.getGroup().isValid())
+return;
+if (opt.getGroup().getID() == OPT_grp_deprecated) {
+warn("Option `" + opt.getPrefixedName() + "' is deprecated in ld64:");
+warn(opt.getHelpText());
+}
+}
+static void warnIfUnimplementedOption(const Option &opt) {
+if (!opt.getGroup().isValid() || !opt.hasFlag(DriverFlag::HelpHidden))
+return;
+switch (opt.getGroup().getID()) {
+case OPT_grp_deprecated:
+// warn about deprecated options elsewhere
+break;
+case OPT_grp_undocumented:
+warn("Option `" + opt.getPrefixedName() +
+"' is undocumented. Should lld implement it?");
+break;
+case OPT_grp_obsolete:
+warn("Option `" + opt.getPrefixedName() +
+"' is obsolete. Please modernize your usage.");
+break;
+case OPT_grp_ignored:
+warn("Option `" + opt.getPrefixedName() + "' is ignored.");
+break;
+default:
+warn("Option `" + opt.getPrefixedName() +
+"' is not yet implemented. Stay tuned...");
+break;
+}
+}
+static const char *getReproduceOption(InputArgList &args) {
+if (const Arg *arg = args.getLastArg(OPT_reproduce))
+return arg->getValue();
+return getenv("LLD_REPRODUCE");
+}
+static void parseClangOption(StringRef opt, const Twine &msg) {
+std::string err;
+raw_string_ostream os(err);
+const char *argv[] = {"lld", opt.data()};
+if (cl::ParseCommandLineOptions(2, argv, "", &os))
+return;
+os.flush();
+error(msg + ": " + StringRef(err).trim());
+}
+static uint32_t parseDylibVersion(const ArgList &args, unsigned id) {
+const Arg *arg = args.getLastArg(id);
+if (!arg)
+return 0;
+if (config->outputType != MH_DYLIB) {
+error(arg->getAsString(args) + ": only valid with -dylib");
+return 0;
+}
+PackedVersion version;
+if (!version.parse32(arg->getValue())) {
+error(arg->getAsString(args) + ": malformed version");
+return 0;
+}
+return version.rawValue();
+}
+static uint32_t parseProtection(StringRef protStr) {
+uint32_t prot = 0;
+for (char c : protStr) {
+switch (c) {
+case 'r':
+prot |= VM_PROT_READ;
+break;
+case 'w':
+prot |= VM_PROT_WRITE;
+break;
+case 'x':
+prot |= VM_PROT_EXECUTE;
+break;
+case '-':
+break;
+default:
+error("unknown -segprot letter '" + Twine(c) + "' in " + protStr);
+return 0;
+}
+}
+return prot;
+}
+static std::vector<SectionAlign> parseSectAlign(const opt::InputArgList &args) {
+std::vector<SectionAlign> sectAligns;
+for (const Arg *arg : args.filtered(OPT_sectalign)) {
+StringRef segName = arg->getValue(0);
+StringRef sectName = arg->getValue(1);
+StringRef alignStr = arg->getValue(2);
+if (alignStr.startswith("0x") || alignStr.startswith("0X"))
+alignStr = alignStr.drop_front(2);
+uint32_t align;
+if (alignStr.getAsInteger(16, align)) {
+error("-sectalign: failed to parse '" + StringRef(arg->getValue(2)) +
+"' as number");
+continue;
+}
+if (!isPowerOf2_32(align)) {
+error("-sectalign: '" + StringRef(arg->getValue(2)) +
+"' (in base 16) not a power of two");
+continue;
+}
+sectAligns.push_back({segName, sectName, align});
+}
+return sectAligns;
+}
+static bool dataConstDefault(const InputArgList &args) {
+switch (config->outputType) {
+case MH_EXECUTE:
+return !args.hasArg(OPT_no_pie);
+case MH_BUNDLE:
+// FIXME: return false when -final_name ...
+// has prefix "/System/Library/UserEventPlugins/"
+// or matches "/usr/libexec/locationd" "/usr/libexec/terminusd"
+return true;
+case MH_DYLIB:
+return true;
+case MH_OBJECT:
+return false;
+default:
+llvm_unreachable(
+"unsupported output type for determining data-const default");
+}
+return false;
+}
+void SymbolPatterns::clear() {
+literals.clear();
+globs.clear();
+}
+void SymbolPatterns::insert(StringRef symbolName) {
+if (symbolName.find_first_of("*?[]") == StringRef::npos)
+literals.insert(CachedHashStringRef(symbolName));
+else if (Expected<GlobPattern> pattern = GlobPattern::create(symbolName))
+globs.emplace_back(*pattern);
+else
+error("invalid symbol-name pattern: " + symbolName);
+}
+bool SymbolPatterns::matchLiteral(StringRef symbolName) const {
+return literals.contains(CachedHashStringRef(symbolName));
+}
+bool SymbolPatterns::matchGlob(StringRef symbolName) const {
+for (const llvm::GlobPattern &glob : globs)
+if (glob.match(symbolName))
+return true;
+return false;
+}
+bool SymbolPatterns::match(StringRef symbolName) const {
+return matchLiteral(symbolName) || matchGlob(symbolName);
+}
+static void handleSymbolPatterns(InputArgList &args,
+SymbolPatterns &symbolPatterns,
+unsigned singleOptionCode,
+unsigned listFileOptionCode) {
+for (const Arg *arg : args.filtered(singleOptionCode))
+symbolPatterns.insert(arg->getValue());
+for (const Arg *arg : args.filtered(listFileOptionCode)) {
+StringRef path = arg->getValue();
+Optional<MemoryBufferRef> buffer = readFile(path);
+if (!buffer) {
+error("Could not read symbol file: " + path);
+continue;
+}
+MemoryBufferRef mbref = *buffer;
+for (StringRef line : args::getLines(mbref)) {
+line = line.take_until([](char c) { return c == '#'; }).trim();
+if (!line.empty())
+symbolPatterns.insert(line);
+}
+}
+}
+void createFiles(const InputArgList &args) {
+TimeTraceScope timeScope("Load input files");
+// This loop should be reserved for options whose exact ordering matters.
+// Other options should be handled via filtered() and/or getLastArg().
+for (const Arg *arg : args) {
+const Option &opt = arg->getOption();
+warnIfDeprecatedOption(opt);
+warnIfUnimplementedOption(opt);
+switch (opt.getID()) {
+case OPT_INPUT:
+addFile(rerootPath(arg->getValue()), /*forceLoadArchive=*/false);
+break;
+case OPT_needed_library:
+if (auto *dylibFile = dyn_cast_or_null<DylibFile>(
+addFile(rerootPath(arg->getValue()), false)))
+dylibFile->forceNeeded = true;
+break;
+case OPT_reexport_library:
+if (auto *dylibFile = dyn_cast_or_null<DylibFile>(addFile(
+rerootPath(arg->getValue()), /*forceLoadArchive=*/false))) {
+config->hasReexports = true;
+dylibFile->reexport = true;
+}
+break;
+case OPT_weak_library:
+if (auto *dylibFile = dyn_cast_or_null<DylibFile>(
+addFile(rerootPath(arg->getValue()), /*forceLoadArchive=*/false)))
+dylibFile->forceWeakImport = true;
+break;
+case OPT_filelist:
+addFileList(arg->getValue());
+break;
+case OPT_force_load:
+addFile(rerootPath(arg->getValue()), /*forceLoadArchive=*/true);
+break;
+case OPT_l:
+case OPT_needed_l:
+case OPT_reexport_l:
+case OPT_weak_l:
+addLibrary(arg->getValue(), opt.getID() == OPT_needed_l,
+opt.getID() == OPT_weak_l, opt.getID() == OPT_reexport_l,
+/*isExplicit=*/true);
+break;
+case OPT_framework:
+case OPT_needed_framework:
+case OPT_reexport_framework:
+case OPT_weak_framework:
+addFramework(arg->getValue(), opt.getID() == OPT_needed_framework,
+opt.getID() == OPT_weak_framework,
+opt.getID() == OPT_reexport_framework, /*isExplicit=*/true);
+break;
+default:
+break;
+}
+}
+}
+bool macho::link(ArrayRef<const char *> argsArr, bool canExitEarly,
 raw_ostream &stdoutOS, raw_ostream &stderrOS) {
 lld::stdoutOS = &stdoutOS;
 lld::stderrOS = &stderrOS;
+errorHandler().cleanupCallback = []() { freeArena(); };
+errorHandler().logName = args::getFilenameWithoutExe(argsArr[0]);
 stderrOS.enable_colors(stderrOS.has_colors());
-// TODO: Set up error handler properly, e.g. the errorLimitExceededMsg
 MachOOptTable parser;
-opt::InputArgList args = parser.parse(argsArr.slice(1));
+InputArgList args = parser.parse(argsArr.slice(1));
+errorHandler().errorLimitExceededMsg =
+"too many errors emitted, stopping now "
+"(use --error-limit=0 to see all errors)";
+errorHandler().errorLimit = args::getInteger(args, OPT_error_limit_eq, 20);
+errorHandler().verbose = args.hasArg(OPT_verbose);
+if (args.hasArg(OPT_help_hidden)) {
+parser.printHelp(argsArr[0], /*showHidden=*/true);
+return true;
+}
+if (args.hasArg(OPT_help)) {
+parser.printHelp(argsArr[0], /*showHidden=*/false);
+return true;
+}
+if (args.hasArg(OPT_version)) {
+message(getLLDVersion());
+return true;
+}
 config = make<Configuration>();
 symtab = make<SymbolTable>();
 target = createTargetInfo(args);
+depTracker =
-config->entry = symtab->addUndefined(args.getLastArgValue(OPT_e, "_main"));
+make<DependencyTracker>(args.getLastArgValue(OPT_dependency_info));
+// Must be set before any InputSections and Symbols are created.
+config->deadStrip = args.hasArg(OPT_dead_strip);
+config->systemLibraryRoots = getSystemLibraryRoots(args);
+if (const char *path = getReproduceOption(args)) {
+// Note that --reproduce is a debug option so you can ignore it
+// if you are trying to understand the whole picture of the code.
+Expected<std::unique_ptr<TarWriter>> errOrWriter =
+TarWriter::create(path, path::stem(path));
+if (errOrWriter) {
+tar = std::move(*errOrWriter);
+tar->append("response.txt", createResponseFile(args));
+tar->append("version.txt", getLLDVersion() + "\n");
+} else {
+error("--reproduce: " + toString(errOrWriter.takeError()));
+}
+}
+if (auto *arg = args.getLastArg(OPT_threads_eq)) {
+StringRef v(arg->getValue());
+unsigned threads = 0;
+if (!llvm::to_integer(v, threads, 0) || threads == 0)
+error(arg->getSpelling() + ": expected a positive integer, but got '" +
+arg->getValue() + "'");
+parallel::strategy = hardware_concurrency(threads);
+config->thinLTOJobs = v;
+}
+if (auto *arg = args.getLastArg(OPT_thinlto_jobs_eq))
+config->thinLTOJobs = arg->getValue();
+if (!get_threadpool_strategy(config->thinLTOJobs))
+error("--thinlto-jobs: invalid job count: " + config->thinLTOJobs);
+for (const Arg *arg : args.filtered(OPT_u)) {
+config->explicitUndefineds.push_back(symtab->addUndefined(
+arg->getValue(), /*file=*/nullptr, /*isWeakRef=*/false));
+}
+for (const Arg *arg : args.filtered(OPT_U))
+symtab->addDynamicLookup(arg->getValue());
+config->mapFile = args.getLastArgValue(OPT_map);
 config->outputFile = args.getLastArgValue(OPT_o, "a.out");
-config->installName =
+config->astPaths = args.getAllArgValues(OPT_add_ast_path);
-args.getLastArgValue(OPT_install_name, config->outputFile);
+config->headerPad = args::getHex(args, OPT_headerpad, /*Default=*/32);
-config->searchPaths = getSearchPaths(args);
+config->headerPadMaxInstallNames =
-config->outputType = args.hasArg(OPT_dylib) ? MH_DYLIB : MH_EXECUTE;
+args.hasArg(OPT_headerpad_max_install_names);
+config->printEachFile = args.hasArg(OPT_t);
+config->printWhyLoad = args.hasArg(OPT_why_load);
+config->outputType = getOutputType(args);
+if (const Arg *arg = args.getLastArg(OPT_bundle_loader)) {
+if (config->outputType != MH_BUNDLE)
+error("-bundle_loader can only be used with MachO bundle output");
+addFile(arg->getValue(), /*forceLoadArchive=*/false, /*isExplicit=*/false,
+/*isBundleLoader=*/true);
+}
+config->ltoObjPath = args.getLastArgValue(OPT_object_path_lto);
+config->ltoNewPassManager =
+args.hasFlag(OPT_no_lto_legacy_pass_manager, OPT_lto_legacy_pass_manager,
+LLVM_ENABLE_NEW_PASS_MANAGER);
+config->runtimePaths = args::getStrings(args, OPT_rpath);
+config->allLoad = args.hasArg(OPT_all_load);
+config->forceLoadObjC = args.hasArg(OPT_ObjC);
+config->deadStripDylibs = args.hasArg(OPT_dead_strip_dylibs);
+config->demangle = args.hasArg(OPT_demangle);
+config->implicitDylibs = !args.hasArg(OPT_no_implicit_dylibs);
+config->emitFunctionStarts = !args.hasArg(OPT_no_function_starts);
+config->emitBitcodeBundle = args.hasArg(OPT_bitcode_bundle);
+// FIXME: Add a commandline flag for this too.
+config->zeroModTime = getenv("ZERO_AR_DATE");
+std::array<PlatformKind, 3> encryptablePlatforms{
+PlatformKind::iOS, PlatformKind::watchOS, PlatformKind::tvOS};
+config->emitEncryptionInfo =
+args.hasFlag(OPT_encryptable, OPT_no_encryption,
+is_contained(encryptablePlatforms, config->platform()));
+#ifndef LLVM_HAVE_LIBXAR
+if (config->emitBitcodeBundle)
+error("-bitcode_bundle unsupported because LLD wasn't built with libxar");
+#endif
+if (const Arg *arg = args.getLastArg(OPT_install_name)) {
+if (config->outputType != MH_DYLIB)
+warn(arg->getAsString(args) + ": ignored, only has effect with -dylib");
+else
+config->installName = arg->getValue();
+} else if (config->outputType == MH_DYLIB) {
+config->installName = config->outputFile;
+}
+if (args.hasArg(OPT_mark_dead_strippable_dylib)) {
+if (config->outputType != MH_DYLIB)
+warn("-mark_dead_strippable_dylib: ignored, only has effect with -dylib");
+else
+config->markDeadStrippableDylib = true;
+}
+if (const Arg *arg = args.getLastArg(OPT_static, OPT_dynamic))
+config->staticLink = (arg->getOption().getID() == OPT_static);
+if (const Arg *arg =
+args.getLastArg(OPT_flat_namespace, OPT_twolevel_namespace))
+config->namespaceKind = arg->getOption().getID() == OPT_twolevel_namespace
+? NamespaceKind::twolevel
+: NamespaceKind::flat;
+config->undefinedSymbolTreatment = getUndefinedSymbolTreatment(args);
+if (config->outputType == MH_EXECUTE)
+config->entry = symtab->addUndefined(args.getLastArgValue(OPT_e, "_main"),
+/*file=*/nullptr,
+/*isWeakRef=*/false);
+config->librarySearchPaths =
+getLibrarySearchPaths(args, config->systemLibraryRoots);
+config->frameworkSearchPaths =
+getFrameworkSearchPaths(args, config->systemLibraryRoots);
+if (const Arg *arg =
+args.getLastArg(OPT_search_paths_first, OPT_search_dylibs_first))
+config->searchDylibsFirst =
+arg->getOption().getID() == OPT_search_dylibs_first;
+config->dylibCompatibilityVersion =
+parseDylibVersion(args, OPT_compatibility_version);
+config->dylibCurrentVersion = parseDylibVersion(args, OPT_current_version);
+config->dataConst =
+args.hasFlag(OPT_data_const, OPT_no_data_const, dataConstDefault(args));
+// Populate config->sectionRenameMap with builtin default renames.
+// Options -rename_section and -rename_segment are able to override.
+initializeSectionRenameMap();
+// Reject every special character except '.' and '$'
+// TODO(gkm): verify that this is the proper set of invalid chars
+StringRef invalidNameChars("!\"#%&'()*+,-/:;<=>?@[\\]^`{|}~");
+auto validName = [invalidNameChars](StringRef s) {
+if (s.find_first_of(invalidNameChars) != StringRef::npos)
+error("invalid name for segment or section: " + s);
+return s;
+};
+for (const Arg *arg : args.filtered(OPT_rename_section)) {
+config->sectionRenameMap[{validName(arg->getValue(0)),
+validName(arg->getValue(1))}] = {
+validName(arg->getValue(2)), validName(arg->getValue(3))};
+}
+for (const Arg *arg : args.filtered(OPT_rename_segment)) {
+config->segmentRenameMap[validName(arg->getValue(0))] =
+validName(arg->getValue(1));
+}
+config->sectionAlignments = parseSectAlign(args);
+for (const Arg *arg : args.filtered(OPT_segprot)) {
+StringRef segName = arg->getValue(0);
+uint32_t maxProt = parseProtection(arg->getValue(1));
+uint32_t initProt = parseProtection(arg->getValue(2));
+if (maxProt != initProt && config->arch() != AK_i386)
+error("invalid argument '" + arg->getAsString(args) +
+"': max and init must be the same for non-i386 archs");
+if (segName == segment_names::linkEdit)
+error("-segprot cannot be used to change __LINKEDIT's protections");
+config->segmentProtections.push_back({segName, maxProt, initProt});
+}
+handleSymbolPatterns(args, config->exportedSymbols, OPT_exported_symbol,
+OPT_exported_symbols_list);
+handleSymbolPatterns(args, config->unexportedSymbols, OPT_unexported_symbol,
+OPT_unexported_symbols_list);
+if (!config->exportedSymbols.empty() && !config->unexportedSymbols.empty()) {
+error("cannot use both -exported_symbol* and -unexported_symbol* options\n"
+">>> ignoring unexports");
+config->unexportedSymbols.clear();
+}
+// Explicitly-exported literal symbols must be defined, but might
+// languish in an archive if unreferenced elsewhere. Light a fire
+// under those lazy symbols!
+for (const CachedHashStringRef &cachedName : config->exportedSymbols.literals)
+symtab->addUndefined(cachedName.val(), /*file=*/nullptr,
+/*isWeakRef=*/false);
+config->saveTemps = args.hasArg(OPT_save_temps);
+config->adhocCodesign = args.hasFlag(
+OPT_adhoc_codesign, OPT_no_adhoc_codesign,
+(config->arch() == AK_arm64 || config->arch() == AK_arm64e) &&
+config->platform() == PlatformKind::macOS);
 if (args.hasArg(OPT_v)) {
 message(getLLDVersion());
-std::vector<StringRef> &searchPaths = config->searchPaths;
+message(StringRef("Library search paths:") +
-message("Library search paths:\n" +
+(config->librarySearchPaths.empty()
-llvm::join(searchPaths.begin(), searchPaths.end(), "\n"));
+? ""
-freeArena();
+: "\n\t" + join(config->librarySearchPaths, "\n\t")));
-return !errorCount();
+message(StringRef("Framework search paths:") +
-}
+(config->frameworkSearchPaths.empty()
+? ""
-for (opt::ArgList::iterator it = args.begin(), end = args.end(); it != end;
+: "\n\t" + join(config->frameworkSearchPaths, "\n\t")));
-++it) {
+}
-const opt::Arg *arg = *it;
-switch (arg->getOption().getID()) {
+config->progName = argsArr[0];
-case OPT_INPUT:
-addFile(arg->getValue());
+config->timeTraceEnabled = args.hasArg(
-break;
+OPT_time_trace, OPT_time_trace_granularity_eq, OPT_time_trace_file_eq);
-case OPT_l:
+config->timeTraceGranularity =
-if (Optional<std::string> path = findDylib(arg->getValue()))
+args::getInteger(args, OPT_time_trace_granularity_eq, 500);
-addFile(*path);
-break;
+// Initialize time trace profiler.
-case OPT_platform_version: {
+if (config->timeTraceEnabled)
-handlePlatformVersion(it, end); // Can advance "it".
+timeTraceProfilerInitialize(config->timeTraceGranularity, config->progName);
-break;
-}
+{
-}
+TimeTraceScope timeScope("ExecuteLinker");
-}
+initLLVM(); // must be run before any call to addFile()
-// Now that all dylibs have been loaded, search for those that should be
+createFiles(args);
-// re-exported.
-for (opt::Arg *arg : args.filtered(OPT_sub_library)) {
+config->isPic = config->outputType == MH_DYLIB ||
-config->hasReexports = true;
+config->outputType == MH_BUNDLE ||
-StringRef searchName = arg->getValue();
+(config->outputType == MH_EXECUTE &&
-if (!markSubLibrary(searchName))
+args.hasFlag(OPT_pie, OPT_no_pie, true));
-error("-sub_library " + searchName + " does not match a supplied dylib");
-}
+// Now that all dylibs have been loaded, search for those that should be
+// re-exported.
-StringRef orderFile = args.getLastArgValue(OPT_order_file);
+{
-if (!orderFile.empty())
+auto reexportHandler = [](const Arg *arg,
-parseOrderFile(orderFile);
+const std::vector<StringRef> &extensions) {
+config->hasReexports = true;
-// dyld requires us to load libSystem. Since we may run tests on non-OSX
+StringRef searchName = arg->getValue();
-// systems which do not have libSystem, we mock it out here.
+if (!markReexport(searchName, extensions))
-// TODO: Replace this with a stub tbd file once we have TAPI support.
+error(arg->getSpelling() + " " + searchName +
-if (StringRef(getenv("LLD_IN_TEST")) == "1" &&
+" does not match a supplied dylib");
-config->outputType == MH_EXECUTE) {
+};
-inputFiles.push_back(DylibFile::createLibSystemMock());
+std::vector<StringRef> extensions = {".tbd"};
-}
+for (const Arg *arg : args.filtered(OPT_sub_umbrella))
+reexportHandler(arg, extensions);
-if (config->outputType == MH_EXECUTE && !isa<Defined>(config->entry)) {
-error("undefined symbol: " + config->entry->getName());
+extensions.push_back(".dylib");
-return false;
+for (const Arg *arg : args.filtered(OPT_sub_library))
-}
+reexportHandler(arg, extensions);
+}
-createSyntheticSections();
+// Parse LTO options.
-// Initialize InputSections.
+if (const Arg *arg = args.getLastArg(OPT_mcpu))
-for (InputFile *file : inputFiles) {
+parseClangOption(saver.save("-mcpu=" + StringRef(arg->getValue())),
-for (SubsectionMap &map : file->subsections) {
+arg->getSpelling());
-for (auto &p : map) {
-InputSection *isec = p.second;
+for (const Arg *arg : args.filtered(OPT_mllvm))
-inputSections.push_back(isec);
+parseClangOption(arg->getValue(), arg->getSpelling());
+compileBitcodeFiles();
+replaceCommonSymbols();
+StringRef orderFile = args.getLastArgValue(OPT_order_file);
+if (!orderFile.empty())
+parseOrderFile(orderFile);
+if (config->entry)
+if (auto *undefined = dyn_cast<Undefined>(config->entry))
+treatUndefinedSymbol(*undefined, "the entry point");
+// FIXME: This prints symbols that are undefined both in input files and
+// via -u flag twice.
+for (const Symbol *sym : config->explicitUndefineds) {
+if (const auto *undefined = dyn_cast<Undefined>(sym))
+treatUndefinedSymbol(*undefined, "-u");
+}
+// Literal exported-symbol names must be defined, but glob
+// patterns need not match.
+for (const CachedHashStringRef &cachedName :
+config->exportedSymbols.literals) {
+if (const Symbol *sym = symtab->find(cachedName))
+if (const auto *undefined = dyn_cast<Undefined>(sym))
+treatUndefinedSymbol(*undefined, "-exported_symbol(s_list)");
+}
+// FIXME: should terminate the link early based on errors encountered so
+// far?
+createSyntheticSections();
+createSyntheticSymbols();
+if (!config->exportedSymbols.empty()) {
+for (Symbol *sym : symtab->getSymbols()) {
+if (auto *defined = dyn_cast<Defined>(sym)) {
+StringRef symbolName = defined->getName();
+if (config->exportedSymbols.match(symbolName)) {
+if (defined->privateExtern) {
+error("cannot export hidden symbol " + symbolName +
+"\n>>> defined in " + toString(defined->getFile()));
+}
+} else {
+defined->privateExtern = true;
+}
+}
 }
-}
+} else if (!config->unexportedSymbols.empty()) {
-}
+for (Symbol *sym : symtab->getSymbols())
+if (auto *defined = dyn_cast<Defined>(sym))
-// Write to an output file.
+if (config->unexportedSymbols.match(defined->getName()))
-writeResult();
+defined->privateExtern = true;
+}
+for (const Arg *arg : args.filtered(OPT_sectcreate)) {
+StringRef segName = arg->getValue(0);
+StringRef sectName = arg->getValue(1);
+StringRef fileName = arg->getValue(2);
+Optional<MemoryBufferRef> buffer = readFile(fileName);
+if (buffer)
+inputFiles.insert(make<OpaqueFile>(*buffer, segName, sectName));
+}
+{
+TimeTraceScope timeScope("Gathering input sections");
+// Gather all InputSections into one vector.
+for (const InputFile *file : inputFiles) {
+for (const SubsectionMap &map : file->subsections)
+for (const SubsectionEntry &subsectionEntry : map)
+inputSections.push_back(subsectionEntry.isec);
+}
+}
+if (config->deadStrip)
+markLive();
+// Write to an output file.
+if (target->wordSize == 8)
+writeResult<LP64>();
+else
+writeResult<ILP32>();
+depTracker->write(getLLDVersion(), inputFiles, config->outputFile);
+}
+if (config->timeTraceEnabled) {
+if (auto E = timeTraceProfilerWrite(
+args.getLastArgValue(OPT_time_trace_file_eq).str(),
+config->outputFile)) {
+handleAllErrors(std::move(E),
+[&](const StringError &SE) { error(SE.getMessage()); });
+}
+timeTraceProfilerCleanup();
+}
 if (canExitEarly)
 exitLld(errorCount() ? 1 : 0);
-freeArena();
 return !errorCount();
 }

Mercurial > hg > CbC > CbC_llvm

comparison lld/MachO/Driver.cpp @ 207:2e18cbf3894f