diff options
Diffstat (limited to 'contrib/llvm/tools/lld/ELF/Driver.cpp')
| -rw-r--r-- | contrib/llvm/tools/lld/ELF/Driver.cpp | 1901 |
1 files changed, 1078 insertions, 823 deletions
diff --git a/contrib/llvm/tools/lld/ELF/Driver.cpp b/contrib/llvm/tools/lld/ELF/Driver.cpp index fcf304f1814f..fbfc71d22b7e 100644 --- a/contrib/llvm/tools/lld/ELF/Driver.cpp +++ b/contrib/llvm/tools/lld/ELF/Driver.cpp @@ -1,9 +1,8 @@ //===- Driver.cpp ---------------------------------------------------------===// // -// The LLVM Linker -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // @@ -25,7 +24,6 @@ #include "Driver.h" #include "Config.h" -#include "Filesystem.h" #include "ICF.h" #include "InputFiles.h" #include "InputSection.h" @@ -41,6 +39,7 @@ #include "lld/Common/Args.h" #include "lld/Common/Driver.h" #include "lld/Common/ErrorHandler.h" +#include "lld/Common/Filesystem.h" #include "lld/Common/Memory.h" #include "lld/Common/Strings.h" #include "lld/Common/TargetOptionsCommandFlags.h" @@ -51,6 +50,7 @@ #include "llvm/ADT/StringSwitch.h" #include "llvm/Support/CommandLine.h" #include "llvm/Support/Compression.h" +#include "llvm/Support/GlobPattern.h" #include "llvm/Support/LEB128.h" #include "llvm/Support/Path.h" #include "llvm/Support/TarWriter.h" @@ -68,44 +68,49 @@ using namespace llvm::support; using namespace lld; using namespace lld::elf; -Configuration *elf::Config; -LinkerDriver *elf::Driver; +Configuration *elf::config; +LinkerDriver *elf::driver; -static void setConfigs(opt::InputArgList &Args); +static void setConfigs(opt::InputArgList &args); +static void readConfigs(opt::InputArgList &args); -bool elf::link(ArrayRef<const char *> Args, bool CanExitEarly, - raw_ostream &Error) { - errorHandler().LogName = args::getFilenameWithoutExe(Args[0]); - errorHandler().ErrorLimitExceededMsg = +bool elf::link(ArrayRef<const char *> args, bool canExitEarly, + raw_ostream &error) { + errorHandler().logName = args::getFilenameWithoutExe(args[0]); + errorHandler().errorLimitExceededMsg = "too many errors emitted, stopping now (use " "-error-limit=0 to see all errors)"; - errorHandler().ErrorOS = &Error; - errorHandler().ExitEarly = CanExitEarly; - errorHandler().ColorDiagnostics = Error.has_colors(); + errorHandler().errorOS = &error; + errorHandler().exitEarly = canExitEarly; + errorHandler().colorDiagnostics = error.has_colors(); + + inputSections.clear(); + outputSections.clear(); + binaryFiles.clear(); + bitcodeFiles.clear(); + objectFiles.clear(); + sharedFiles.clear(); + + config = make<Configuration>(); + driver = make<LinkerDriver>(); + script = make<LinkerScript>(); + symtab = make<SymbolTable>(); - InputSections.clear(); - OutputSections.clear(); - BinaryFiles.clear(); - BitcodeFiles.clear(); - ObjectFiles.clear(); - SharedFiles.clear(); + tar = nullptr; + memset(&in, 0, sizeof(in)); - Config = make<Configuration>(); - Driver = make<LinkerDriver>(); - Script = make<LinkerScript>(); - Symtab = make<SymbolTable>(); + partitions = {Partition()}; - Tar = nullptr; - memset(&In, 0, sizeof(In)); + SharedFile::vernauxNum = 0; - Config->ProgName = Args[0]; + config->progName = args[0]; - Driver->main(Args); + driver->main(args); // Exit immediately if we don't need to return to the caller. // This saves time because the overhead of calling destructors // for all globally-allocated objects is not negligible. - if (CanExitEarly) + if (canExitEarly) exitLld(errorCount() ? 1 : 0); freeArena(); @@ -113,16 +118,16 @@ bool elf::link(ArrayRef<const char *> Args, bool CanExitEarly, } // Parses a linker -m option. -static std::tuple<ELFKind, uint16_t, uint8_t> parseEmulation(StringRef Emul) { - uint8_t OSABI = 0; - StringRef S = Emul; - if (S.endswith("_fbsd")) { - S = S.drop_back(5); - OSABI = ELFOSABI_FREEBSD; +static std::tuple<ELFKind, uint16_t, uint8_t> parseEmulation(StringRef emul) { + uint8_t osabi = 0; + StringRef s = emul; + if (s.endswith("_fbsd")) { + s = s.drop_back(5); + osabi = ELFOSABI_FREEBSD; } - std::pair<ELFKind, uint16_t> Ret = - StringSwitch<std::pair<ELFKind, uint16_t>>(S) + std::pair<ELFKind, uint16_t> ret = + StringSwitch<std::pair<ELFKind, uint16_t>>(s) .Cases("aarch64elf", "aarch64linux", "aarch64_elf64_le_vec", {ELF64LEKind, EM_AARCH64}) .Cases("armelf", "armelf_linux_eabi", {ELF32LEKind, EM_ARM}) @@ -141,91 +146,101 @@ static std::tuple<ELFKind, uint16_t, uint8_t> parseEmulation(StringRef Emul) { .Case("elf_iamcu", {ELF32LEKind, EM_IAMCU}) .Default({ELFNoneKind, EM_NONE}); - if (Ret.first == ELFNoneKind) - error("unknown emulation: " + Emul); - return std::make_tuple(Ret.first, Ret.second, OSABI); + if (ret.first == ELFNoneKind) + error("unknown emulation: " + emul); + return std::make_tuple(ret.first, ret.second, osabi); } // Returns slices of MB by parsing MB as an archive file. // Each slice consists of a member file in the archive. std::vector<std::pair<MemoryBufferRef, uint64_t>> static getArchiveMembers( - MemoryBufferRef MB) { - std::unique_ptr<Archive> File = - CHECK(Archive::create(MB), - MB.getBufferIdentifier() + ": failed to parse archive"); - - std::vector<std::pair<MemoryBufferRef, uint64_t>> V; - Error Err = Error::success(); - bool AddToTar = File->isThin() && Tar; - for (const ErrorOr<Archive::Child> &COrErr : File->children(Err)) { - Archive::Child C = - CHECK(COrErr, MB.getBufferIdentifier() + + MemoryBufferRef mb) { + std::unique_ptr<Archive> file = + CHECK(Archive::create(mb), + mb.getBufferIdentifier() + ": failed to parse archive"); + + std::vector<std::pair<MemoryBufferRef, uint64_t>> v; + Error err = Error::success(); + bool addToTar = file->isThin() && tar; + for (const ErrorOr<Archive::Child> &cOrErr : file->children(err)) { + Archive::Child c = + CHECK(cOrErr, mb.getBufferIdentifier() + ": could not get the child of the archive"); - MemoryBufferRef MBRef = - CHECK(C.getMemoryBufferRef(), - MB.getBufferIdentifier() + + 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()); - V.push_back(std::make_pair(MBRef, C.getChildOffset())); + if (addToTar) + tar->append(relativeToRoot(check(c.getFullName())), mbref.getBuffer()); + v.push_back(std::make_pair(mbref, c.getChildOffset())); } - if (Err) - fatal(MB.getBufferIdentifier() + ": Archive::children failed: " + - toString(std::move(Err))); + if (err) + fatal(mb.getBufferIdentifier() + ": Archive::children failed: " + + toString(std::move(err))); // Take ownership of memory buffers created for members of thin archives. - for (std::unique_ptr<MemoryBuffer> &MB : File->takeThinBuffers()) - make<std::unique_ptr<MemoryBuffer>>(std::move(MB)); + for (std::unique_ptr<MemoryBuffer> &mb : file->takeThinBuffers()) + make<std::unique_ptr<MemoryBuffer>>(std::move(mb)); - return V; + return v; } // Opens a file and create a file object. Path has to be resolved already. -void LinkerDriver::addFile(StringRef Path, bool WithLOption) { +void LinkerDriver::addFile(StringRef path, bool withLOption) { using namespace sys::fs; - Optional<MemoryBufferRef> Buffer = readFile(Path); - if (!Buffer.hasValue()) + Optional<MemoryBufferRef> buffer = readFile(path); + if (!buffer.hasValue()) return; - MemoryBufferRef MBRef = *Buffer; + MemoryBufferRef mbref = *buffer; - if (Config->FormatBinary) { - Files.push_back(make<BinaryFile>(MBRef)); + if (config->formatBinary) { + files.push_back(make<BinaryFile>(mbref)); return; } - switch (identify_magic(MBRef.getBuffer())) { + switch (identify_magic(mbref.getBuffer())) { case file_magic::unknown: - readLinkerScript(MBRef); + readLinkerScript(mbref); return; case file_magic::archive: { // Handle -whole-archive. - if (InWholeArchive) { - for (const auto &P : getArchiveMembers(MBRef)) - Files.push_back(createObjectFile(P.first, Path, P.second)); + if (inWholeArchive) { + for (const auto &p : getArchiveMembers(mbref)) + files.push_back(createObjectFile(p.first, path, p.second)); return; } - std::unique_ptr<Archive> File = - CHECK(Archive::create(MBRef), Path + ": failed to parse archive"); + std::unique_ptr<Archive> file = + CHECK(Archive::create(mbref), path + ": failed to parse archive"); // If an archive file has no symbol table, it is likely that a user // is attempting LTO and using a default ar command that doesn't // understand the LLVM bitcode file. It is a pretty common error, so // we'll handle it as if it had a symbol table. - if (!File->isEmpty() && !File->hasSymbolTable()) { - for (const auto &P : getArchiveMembers(MBRef)) - Files.push_back(make<LazyObjFile>(P.first, Path, P.second)); + if (!file->isEmpty() && !file->hasSymbolTable()) { + // Check if all members are bitcode files. If not, ignore, which is the + // default action without the LTO hack described above. + for (const std::pair<MemoryBufferRef, uint64_t> &p : + getArchiveMembers(mbref)) + if (identify_magic(p.first.getBuffer()) != file_magic::bitcode) { + error(path + ": archive has no index; run ranlib to add one"); + return; + } + + for (const std::pair<MemoryBufferRef, uint64_t> &p : + getArchiveMembers(mbref)) + files.push_back(make<LazyObjFile>(p.first, path, p.second)); return; } // Handle the regular case. - Files.push_back(make<ArchiveFile>(std::move(File))); + files.push_back(make<ArchiveFile>(std::move(file))); return; } case file_magic::elf_shared_object: - if (Config->Static || Config->Relocatable) { - error("attempted static link of dynamic object " + Path); + if (config->isStatic || config->relocatable) { + error("attempted static link of dynamic object " + path); return; } @@ -239,27 +254,27 @@ void LinkerDriver::addFile(StringRef Path, bool WithLOption) { // If a file was specified by -lfoo, the directory part is not // significant, as a user did not specify it. This behavior is // compatible with GNU. - Files.push_back( - createSharedFile(MBRef, WithLOption ? path::filename(Path) : Path)); + files.push_back( + make<SharedFile>(mbref, withLOption ? path::filename(path) : path)); return; case file_magic::bitcode: case file_magic::elf_relocatable: - if (InLib) - Files.push_back(make<LazyObjFile>(MBRef, "", 0)); + if (inLib) + files.push_back(make<LazyObjFile>(mbref, "", 0)); else - Files.push_back(createObjectFile(MBRef)); + files.push_back(createObjectFile(mbref)); break; default: - error(Path + ": unknown file type"); + error(path + ": unknown file type"); } } // Add a given library by searching it from input search paths. -void LinkerDriver::addLibrary(StringRef Name) { - if (Optional<std::string> Path = searchLibrary(Name)) - addFile(*Path, /*WithLOption=*/true); +void LinkerDriver::addLibrary(StringRef name) { + if (Optional<std::string> path = searchLibrary(name)) + addFile(*path, /*withLOption=*/true); else - error("unable to find library -l" + Name); + error("unable to find library -l" + name); } // This function is called on startup. We need this for LTO since @@ -278,105 +293,117 @@ static void initLLVM() { static void checkOptions() { // The MIPS ABI as of 2016 does not support the GNU-style symbol lookup // table which is a relatively new feature. - if (Config->EMachine == EM_MIPS && Config->GnuHash) + if (config->emachine == EM_MIPS && config->gnuHash) error("the .gnu.hash section is not compatible with the MIPS target"); - if (Config->FixCortexA53Errata843419 && Config->EMachine != EM_AARCH64) + if (config->fixCortexA53Errata843419 && config->emachine != EM_AARCH64) error("--fix-cortex-a53-843419 is only supported on AArch64 targets"); - if (Config->TocOptimize && Config->EMachine != EM_PPC64) + if (config->tocOptimize && config->emachine != EM_PPC64) error("--toc-optimize is only supported on the PowerPC64 target"); - if (Config->Pie && Config->Shared) + if (config->pie && config->shared) error("-shared and -pie may not be used together"); - if (!Config->Shared && !Config->FilterList.empty()) + if (!config->shared && !config->filterList.empty()) error("-F may not be used without -shared"); - if (!Config->Shared && !Config->AuxiliaryList.empty()) + if (!config->shared && !config->auxiliaryList.empty()) error("-f may not be used without -shared"); - if (!Config->Relocatable && !Config->DefineCommon) + if (!config->relocatable && !config->defineCommon) error("-no-define-common not supported in non relocatable output"); - if (Config->ZText && Config->ZIfuncNoplt) + if (config->zText && config->zIfuncNoplt) error("-z text and -z ifunc-noplt may not be used together"); - if (Config->Relocatable) { - if (Config->Shared) + if (config->relocatable) { + if (config->shared) error("-r and -shared may not be used together"); - if (Config->GcSections) + if (config->gcSections) error("-r and --gc-sections may not be used together"); - if (Config->GdbIndex) + if (config->gdbIndex) error("-r and --gdb-index may not be used together"); - if (Config->ICF != ICFLevel::None) + if (config->icf != ICFLevel::None) error("-r and --icf may not be used together"); - if (Config->Pie) + if (config->pie) error("-r and -pie may not be used together"); } - if (Config->ExecuteOnly) { - if (Config->EMachine != EM_AARCH64) + if (config->executeOnly) { + if (config->emachine != EM_AARCH64) error("-execute-only is only supported on AArch64 targets"); - if (Config->SingleRoRx && !Script->HasSectionsCommand) + if (config->singleRoRx && !script->hasSectionsCommand) error("-execute-only and -no-rosegment cannot be used together"); } + + if (config->zRetpolineplt && config->requireCET) + error("--require-cet may not be used with -z retpolineplt"); + + if (config->emachine != EM_AARCH64) { + if (config->pacPlt) + error("--pac-plt only supported on AArch64"); + if (config->forceBTI) + error("--force-bti only supported on AArch64"); + } } -static const char *getReproduceOption(opt::InputArgList &Args) { - if (auto *Arg = Args.getLastArg(OPT_reproduce)) - return Arg->getValue(); +static const char *getReproduceOption(opt::InputArgList &args) { + if (auto *arg = args.getLastArg(OPT_reproduce)) + return arg->getValue(); return getenv("LLD_REPRODUCE"); } -static bool hasZOption(opt::InputArgList &Args, StringRef Key) { - for (auto *Arg : Args.filtered(OPT_z)) - if (Key == Arg->getValue()) +static bool hasZOption(opt::InputArgList &args, StringRef key) { + for (auto *arg : args.filtered(OPT_z)) + if (key == arg->getValue()) return true; return false; } -static bool getZFlag(opt::InputArgList &Args, StringRef K1, StringRef K2, +static bool getZFlag(opt::InputArgList &args, StringRef k1, StringRef k2, bool Default) { - for (auto *Arg : Args.filtered_reverse(OPT_z)) { - if (K1 == Arg->getValue()) + for (auto *arg : args.filtered_reverse(OPT_z)) { + if (k1 == arg->getValue()) return true; - if (K2 == Arg->getValue()) + if (k2 == arg->getValue()) return false; } return Default; } -static bool isKnownZFlag(StringRef S) { - return S == "combreloc" || S == "copyreloc" || S == "defs" || - S == "execstack" || S == "global" || S == "hazardplt" || - S == "ifunc-noplt" || S == "initfirst" || S == "interpose" || - S == "keep-text-section-prefix" || S == "lazy" || S == "muldefs" || - S == "nocombreloc" || S == "nocopyreloc" || S == "nodefaultlib" || - S == "nodelete" || S == "nodlopen" || S == "noexecstack" || - S == "nokeep-text-section-prefix" || S == "norelro" || S == "notext" || - S == "now" || S == "origin" || S == "relro" || S == "retpolineplt" || - S == "rodynamic" || S == "text" || S == "wxneeded" || - S.startswith("max-page-size=") || S.startswith("stack-size="); +static bool isKnownZFlag(StringRef s) { + return s == "combreloc" || s == "copyreloc" || s == "defs" || + s == "execstack" || s == "global" || s == "hazardplt" || + s == "ifunc-noplt" || s == "initfirst" || s == "interpose" || + s == "keep-text-section-prefix" || s == "lazy" || s == "muldefs" || + s == "nocombreloc" || s == "nocopyreloc" || s == "nodefaultlib" || + s == "nodelete" || s == "nodlopen" || s == "noexecstack" || + s == "nokeep-text-section-prefix" || s == "norelro" || s == "notext" || + s == "now" || s == "origin" || s == "relro" || s == "retpolineplt" || + s == "rodynamic" || s == "text" || s == "wxneeded" || + s.startswith("common-page-size") || s.startswith("max-page-size=") || + s.startswith("stack-size="); } // Report an error for an unknown -z option. -static void checkZOptions(opt::InputArgList &Args) { - for (auto *Arg : Args.filtered(OPT_z)) - if (!isKnownZFlag(Arg->getValue())) - error("unknown -z value: " + StringRef(Arg->getValue())); +static void checkZOptions(opt::InputArgList &args) { + for (auto *arg : args.filtered(OPT_z)) + if (!isKnownZFlag(arg->getValue())) + error("unknown -z value: " + StringRef(arg->getValue())); } -void LinkerDriver::main(ArrayRef<const char *> ArgsArr) { - ELFOptTable Parser; - opt::InputArgList Args = Parser.parse(ArgsArr.slice(1)); +void LinkerDriver::main(ArrayRef<const char *> argsArr) { + ELFOptTable parser; + opt::InputArgList args = parser.parse(argsArr.slice(1)); // Interpret this flag early because error() depends on them. - errorHandler().ErrorLimit = args::getInteger(Args, OPT_error_limit, 20); + errorHandler().errorLimit = args::getInteger(args, OPT_error_limit, 20); + checkZOptions(args); // Handle -help - if (Args.hasArg(OPT_help)) { + if (args.hasArg(OPT_help)) { printHelp(); return; } @@ -396,213 +423,218 @@ void LinkerDriver::main(ArrayRef<const char *> ArgsArr) { // lot of "configure" scripts out there that are generated by old version // of Libtool. We cannot convince every software developer to migrate to // the latest version and re-generate scripts. So we have this hack. - if (Args.hasArg(OPT_v) || Args.hasArg(OPT_version)) + if (args.hasArg(OPT_v) || args.hasArg(OPT_version)) message(getLLDVersion() + " (compatible with GNU linkers)"); - if (const char *Path = getReproduceOption(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"); + 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())); + error("--reproduce: " + toString(errOrWriter.takeError())); } } - readConfigs(Args); - checkZOptions(Args); + readConfigs(args); // The behavior of -v or --version is a bit strange, but this is // needed for compatibility with GNU linkers. - if (Args.hasArg(OPT_v) && !Args.hasArg(OPT_INPUT)) + if (args.hasArg(OPT_v) && !args.hasArg(OPT_INPUT)) return; - if (Args.hasArg(OPT_version)) + if (args.hasArg(OPT_version)) return; initLLVM(); - createFiles(Args); + createFiles(args); if (errorCount()) return; inferMachineType(); - setConfigs(Args); + setConfigs(args); checkOptions(); if (errorCount()) return; - switch (Config->EKind) { + // The Target instance handles target-specific stuff, such as applying + // relocations or writing a PLT section. It also contains target-dependent + // values such as a default image base address. + target = getTarget(); + + switch (config->ekind) { case ELF32LEKind: - link<ELF32LE>(Args); + link<ELF32LE>(args); return; case ELF32BEKind: - link<ELF32BE>(Args); + link<ELF32BE>(args); return; case ELF64LEKind: - link<ELF64LE>(Args); + link<ELF64LE>(args); return; case ELF64BEKind: - link<ELF64BE>(Args); + link<ELF64BE>(args); return; default: llvm_unreachable("unknown Config->EKind"); } } -static std::string getRpath(opt::InputArgList &Args) { - std::vector<StringRef> V = args::getStrings(Args, OPT_rpath); - return llvm::join(V.begin(), V.end(), ":"); +static std::string getRpath(opt::InputArgList &args) { + std::vector<StringRef> v = args::getStrings(args, OPT_rpath); + return llvm::join(v.begin(), v.end(), ":"); } // Determines what we should do if there are remaining unresolved // symbols after the name resolution. -static UnresolvedPolicy getUnresolvedSymbolPolicy(opt::InputArgList &Args) { - UnresolvedPolicy ErrorOrWarn = Args.hasFlag(OPT_error_unresolved_symbols, +static UnresolvedPolicy getUnresolvedSymbolPolicy(opt::InputArgList &args) { + UnresolvedPolicy errorOrWarn = args.hasFlag(OPT_error_unresolved_symbols, OPT_warn_unresolved_symbols, true) ? UnresolvedPolicy::ReportError : UnresolvedPolicy::Warn; // Process the last of -unresolved-symbols, -no-undefined or -z defs. - for (auto *Arg : llvm::reverse(Args)) { - switch (Arg->getOption().getID()) { + for (auto *arg : llvm::reverse(args)) { + switch (arg->getOption().getID()) { case OPT_unresolved_symbols: { - StringRef S = Arg->getValue(); - if (S == "ignore-all" || S == "ignore-in-object-files") + StringRef s = arg->getValue(); + if (s == "ignore-all" || s == "ignore-in-object-files") return UnresolvedPolicy::Ignore; - if (S == "ignore-in-shared-libs" || S == "report-all") - return ErrorOrWarn; - error("unknown --unresolved-symbols value: " + S); + if (s == "ignore-in-shared-libs" || s == "report-all") + return errorOrWarn; + error("unknown --unresolved-symbols value: " + s); continue; } case OPT_no_undefined: - return ErrorOrWarn; + return errorOrWarn; case OPT_z: - if (StringRef(Arg->getValue()) == "defs") - return ErrorOrWarn; + if (StringRef(arg->getValue()) == "defs") + return errorOrWarn; continue; } } // -shared implies -unresolved-symbols=ignore-all because missing // symbols are likely to be resolved at runtime using other DSOs. - if (Config->Shared) + if (config->shared) return UnresolvedPolicy::Ignore; - return ErrorOrWarn; + return errorOrWarn; } -static Target2Policy getTarget2(opt::InputArgList &Args) { - StringRef S = Args.getLastArgValue(OPT_target2, "got-rel"); - if (S == "rel") +static Target2Policy getTarget2(opt::InputArgList &args) { + StringRef s = args.getLastArgValue(OPT_target2, "got-rel"); + if (s == "rel") return Target2Policy::Rel; - if (S == "abs") + if (s == "abs") return Target2Policy::Abs; - if (S == "got-rel") + if (s == "got-rel") return Target2Policy::GotRel; - error("unknown --target2 option: " + S); + error("unknown --target2 option: " + s); return Target2Policy::GotRel; } -static bool isOutputFormatBinary(opt::InputArgList &Args) { - StringRef S = Args.getLastArgValue(OPT_oformat, "elf"); - if (S == "binary") +static bool isOutputFormatBinary(opt::InputArgList &args) { + StringRef s = args.getLastArgValue(OPT_oformat, "elf"); + if (s == "binary") return true; - if (!S.startswith("elf")) - error("unknown --oformat value: " + S); + if (!s.startswith("elf")) + error("unknown --oformat value: " + s); return false; } -static DiscardPolicy getDiscard(opt::InputArgList &Args) { - if (Args.hasArg(OPT_relocatable)) +static DiscardPolicy getDiscard(opt::InputArgList &args) { + if (args.hasArg(OPT_relocatable)) return DiscardPolicy::None; - auto *Arg = - Args.getLastArg(OPT_discard_all, OPT_discard_locals, OPT_discard_none); - if (!Arg) + auto *arg = + args.getLastArg(OPT_discard_all, OPT_discard_locals, OPT_discard_none); + if (!arg) return DiscardPolicy::Default; - if (Arg->getOption().getID() == OPT_discard_all) + if (arg->getOption().getID() == OPT_discard_all) return DiscardPolicy::All; - if (Arg->getOption().getID() == OPT_discard_locals) + if (arg->getOption().getID() == OPT_discard_locals) return DiscardPolicy::Locals; return DiscardPolicy::None; } -static StringRef getDynamicLinker(opt::InputArgList &Args) { - auto *Arg = Args.getLastArg(OPT_dynamic_linker, OPT_no_dynamic_linker); - if (!Arg || Arg->getOption().getID() == OPT_no_dynamic_linker) +static StringRef getDynamicLinker(opt::InputArgList &args) { + auto *arg = args.getLastArg(OPT_dynamic_linker, OPT_no_dynamic_linker); + if (!arg || arg->getOption().getID() == OPT_no_dynamic_linker) return ""; - return Arg->getValue(); + return arg->getValue(); } -static ICFLevel getICF(opt::InputArgList &Args) { - auto *Arg = Args.getLastArg(OPT_icf_none, OPT_icf_safe, OPT_icf_all); - if (!Arg || Arg->getOption().getID() == OPT_icf_none) +static ICFLevel getICF(opt::InputArgList &args) { + auto *arg = args.getLastArg(OPT_icf_none, OPT_icf_safe, OPT_icf_all); + if (!arg || arg->getOption().getID() == OPT_icf_none) return ICFLevel::None; - if (Arg->getOption().getID() == OPT_icf_safe) + if (arg->getOption().getID() == OPT_icf_safe) return ICFLevel::Safe; return ICFLevel::All; } -static StripPolicy getStrip(opt::InputArgList &Args) { - if (Args.hasArg(OPT_relocatable)) +static StripPolicy getStrip(opt::InputArgList &args) { + if (args.hasArg(OPT_relocatable)) return StripPolicy::None; - auto *Arg = Args.getLastArg(OPT_strip_all, OPT_strip_debug); - if (!Arg) + auto *arg = args.getLastArg(OPT_strip_all, OPT_strip_debug); + if (!arg) return StripPolicy::None; - if (Arg->getOption().getID() == OPT_strip_all) + if (arg->getOption().getID() == OPT_strip_all) return StripPolicy::All; return StripPolicy::Debug; } -static uint64_t parseSectionAddress(StringRef S, const opt::Arg &Arg) { - uint64_t VA = 0; - if (S.startswith("0x")) - S = S.drop_front(2); - if (!to_integer(S, VA, 16)) - error("invalid argument: " + toString(Arg)); - return VA; +static uint64_t parseSectionAddress(StringRef s, opt::InputArgList &args, + const opt::Arg &arg) { + uint64_t va = 0; + if (s.startswith("0x")) + s = s.drop_front(2); + if (!to_integer(s, va, 16)) + error("invalid argument: " + arg.getAsString(args)); + return va; } -static StringMap<uint64_t> getSectionStartMap(opt::InputArgList &Args) { - StringMap<uint64_t> Ret; - for (auto *Arg : Args.filtered(OPT_section_start)) { - StringRef Name; - StringRef Addr; - std::tie(Name, Addr) = StringRef(Arg->getValue()).split('='); - Ret[Name] = parseSectionAddress(Addr, *Arg); +static StringMap<uint64_t> getSectionStartMap(opt::InputArgList &args) { + StringMap<uint64_t> ret; + for (auto *arg : args.filtered(OPT_section_start)) { + StringRef name; + StringRef addr; + std::tie(name, addr) = StringRef(arg->getValue()).split('='); + ret[name] = parseSectionAddress(addr, args, *arg); } - if (auto *Arg = Args.getLastArg(OPT_Ttext)) - Ret[".text"] = parseSectionAddress(Arg->getValue(), *Arg); - if (auto *Arg = Args.getLastArg(OPT_Tdata)) - Ret[".data"] = parseSectionAddress(Arg->getValue(), *Arg); - if (auto *Arg = Args.getLastArg(OPT_Tbss)) - Ret[".bss"] = parseSectionAddress(Arg->getValue(), *Arg); - return Ret; + if (auto *arg = args.getLastArg(OPT_Ttext)) + ret[".text"] = parseSectionAddress(arg->getValue(), args, *arg); + if (auto *arg = args.getLastArg(OPT_Tdata)) + ret[".data"] = parseSectionAddress(arg->getValue(), args, *arg); + if (auto *arg = args.getLastArg(OPT_Tbss)) + ret[".bss"] = parseSectionAddress(arg->getValue(), args, *arg); + return ret; } -static SortSectionPolicy getSortSection(opt::InputArgList &Args) { - StringRef S = Args.getLastArgValue(OPT_sort_section); - if (S == "alignment") +static SortSectionPolicy getSortSection(opt::InputArgList &args) { + StringRef s = args.getLastArgValue(OPT_sort_section); + if (s == "alignment") return SortSectionPolicy::Alignment; - if (S == "name") + if (s == "name") return SortSectionPolicy::Name; - if (!S.empty()) - error("unknown --sort-section rule: " + S); + if (!s.empty()) + error("unknown --sort-section rule: " + s); return SortSectionPolicy::Default; } -static OrphanHandlingPolicy getOrphanHandling(opt::InputArgList &Args) { - StringRef S = Args.getLastArgValue(OPT_orphan_handling, "place"); - if (S == "warn") +static OrphanHandlingPolicy getOrphanHandling(opt::InputArgList &args) { + StringRef s = args.getLastArgValue(OPT_orphan_handling, "place"); + if (s == "warn") return OrphanHandlingPolicy::Warn; - if (S == "error") + if (s == "error") return OrphanHandlingPolicy::Error; - if (S != "place") - error("unknown --orphan-handling mode: " + S); + if (s != "place") + error("unknown --orphan-handling mode: " + s); return OrphanHandlingPolicy::Place; } @@ -610,392 +642,412 @@ static OrphanHandlingPolicy getOrphanHandling(opt::InputArgList &Args) { // synonym for "sha1" because all our hash functions including // -build-id=sha1 are actually tree hashes for performance reasons. static std::pair<BuildIdKind, std::vector<uint8_t>> -getBuildId(opt::InputArgList &Args) { - auto *Arg = Args.getLastArg(OPT_build_id, OPT_build_id_eq); - if (!Arg) +getBuildId(opt::InputArgList &args) { + auto *arg = args.getLastArg(OPT_build_id, OPT_build_id_eq); + if (!arg) return {BuildIdKind::None, {}}; - if (Arg->getOption().getID() == OPT_build_id) + if (arg->getOption().getID() == OPT_build_id) return {BuildIdKind::Fast, {}}; - StringRef S = Arg->getValue(); - if (S == "fast") + StringRef s = arg->getValue(); + if (s == "fast") return {BuildIdKind::Fast, {}}; - if (S == "md5") + if (s == "md5") return {BuildIdKind::Md5, {}}; - if (S == "sha1" || S == "tree") + if (s == "sha1" || s == "tree") return {BuildIdKind::Sha1, {}}; - if (S == "uuid") + if (s == "uuid") return {BuildIdKind::Uuid, {}}; - if (S.startswith("0x")) - return {BuildIdKind::Hexstring, parseHex(S.substr(2))}; + if (s.startswith("0x")) + return {BuildIdKind::Hexstring, parseHex(s.substr(2))}; - if (S != "none") - error("unknown --build-id style: " + S); + if (s != "none") + error("unknown --build-id style: " + s); return {BuildIdKind::None, {}}; } -static std::pair<bool, bool> getPackDynRelocs(opt::InputArgList &Args) { - StringRef S = Args.getLastArgValue(OPT_pack_dyn_relocs, "none"); - if (S == "android") +static std::pair<bool, bool> getPackDynRelocs(opt::InputArgList &args) { + StringRef s = args.getLastArgValue(OPT_pack_dyn_relocs, "none"); + if (s == "android") return {true, false}; - if (S == "relr") + if (s == "relr") return {false, true}; - if (S == "android+relr") + if (s == "android+relr") return {true, true}; - if (S != "none") - error("unknown -pack-dyn-relocs format: " + S); + if (s != "none") + error("unknown -pack-dyn-relocs format: " + s); return {false, false}; } -static void readCallGraph(MemoryBufferRef MB) { +static void readCallGraph(MemoryBufferRef mb) { // Build a map from symbol name to section - DenseMap<StringRef, Symbol *> Map; - for (InputFile *File : ObjectFiles) - for (Symbol *Sym : File->getSymbols()) - Map[Sym->getName()] = Sym; - - auto FindSection = [&](StringRef Name) -> InputSectionBase * { - Symbol *Sym = Map.lookup(Name); - if (!Sym) { - if (Config->WarnSymbolOrdering) - warn(MB.getBufferIdentifier() + ": no such symbol: " + Name); + DenseMap<StringRef, Symbol *> map; + for (InputFile *file : objectFiles) + for (Symbol *sym : file->getSymbols()) + map[sym->getName()] = sym; + + auto findSection = [&](StringRef name) -> InputSectionBase * { + Symbol *sym = map.lookup(name); + if (!sym) { + if (config->warnSymbolOrdering) + warn(mb.getBufferIdentifier() + ": no such symbol: " + name); return nullptr; } - maybeWarnUnorderableSymbol(Sym); + maybeWarnUnorderableSymbol(sym); - if (Defined *DR = dyn_cast_or_null<Defined>(Sym)) - return dyn_cast_or_null<InputSectionBase>(DR->Section); + if (Defined *dr = dyn_cast_or_null<Defined>(sym)) + return dyn_cast_or_null<InputSectionBase>(dr->section); return nullptr; }; - for (StringRef Line : args::getLines(MB)) { - SmallVector<StringRef, 3> Fields; - Line.split(Fields, ' '); - uint64_t Count; + for (StringRef line : args::getLines(mb)) { + SmallVector<StringRef, 3> fields; + line.split(fields, ' '); + uint64_t count; - if (Fields.size() != 3 || !to_integer(Fields[2], Count)) { - error(MB.getBufferIdentifier() + ": parse error"); + if (fields.size() != 3 || !to_integer(fields[2], count)) { + error(mb.getBufferIdentifier() + ": parse error"); return; } - if (InputSectionBase *From = FindSection(Fields[0])) - if (InputSectionBase *To = FindSection(Fields[1])) - Config->CallGraphProfile[std::make_pair(From, To)] += Count; + if (InputSectionBase *from = findSection(fields[0])) + if (InputSectionBase *to = findSection(fields[1])) + config->callGraphProfile[std::make_pair(from, to)] += count; } } template <class ELFT> static void readCallGraphsFromObjectFiles() { - for (auto File : ObjectFiles) { - auto *Obj = cast<ObjFile<ELFT>>(File); + for (auto file : objectFiles) { + auto *obj = cast<ObjFile<ELFT>>(file); - for (const Elf_CGProfile_Impl<ELFT> &CGPE : Obj->CGProfile) { - auto *FromSym = dyn_cast<Defined>(&Obj->getSymbol(CGPE.cgp_from)); - auto *ToSym = dyn_cast<Defined>(&Obj->getSymbol(CGPE.cgp_to)); - if (!FromSym || !ToSym) + for (const Elf_CGProfile_Impl<ELFT> &cgpe : obj->cgProfile) { + auto *fromSym = dyn_cast<Defined>(&obj->getSymbol(cgpe.cgp_from)); + auto *toSym = dyn_cast<Defined>(&obj->getSymbol(cgpe.cgp_to)); + if (!fromSym || !toSym) continue; - auto *From = dyn_cast_or_null<InputSectionBase>(FromSym->Section); - auto *To = dyn_cast_or_null<InputSectionBase>(ToSym->Section); - if (From && To) - Config->CallGraphProfile[{From, To}] += CGPE.cgp_weight; + auto *from = dyn_cast_or_null<InputSectionBase>(fromSym->section); + auto *to = dyn_cast_or_null<InputSectionBase>(toSym->section); + if (from && to) + config->callGraphProfile[{from, to}] += cgpe.cgp_weight; } } } -static bool getCompressDebugSections(opt::InputArgList &Args) { - StringRef S = Args.getLastArgValue(OPT_compress_debug_sections, "none"); - if (S == "none") +static bool getCompressDebugSections(opt::InputArgList &args) { + StringRef s = args.getLastArgValue(OPT_compress_debug_sections, "none"); + if (s == "none") return false; - if (S != "zlib") - error("unknown --compress-debug-sections value: " + S); + if (s != "zlib") + error("unknown --compress-debug-sections value: " + s); if (!zlib::isAvailable()) error("--compress-debug-sections: zlib is not available"); return true; } -static std::pair<StringRef, StringRef> getOldNewOptions(opt::InputArgList &Args, - unsigned Id) { - auto *Arg = Args.getLastArg(Id); - if (!Arg) +static std::pair<StringRef, StringRef> getOldNewOptions(opt::InputArgList &args, + unsigned id) { + auto *arg = args.getLastArg(id); + if (!arg) return {"", ""}; - StringRef S = Arg->getValue(); - std::pair<StringRef, StringRef> Ret = S.split(';'); - if (Ret.second.empty()) - error(Arg->getSpelling() + " expects 'old;new' format, but got " + S); - return Ret; + StringRef s = arg->getValue(); + std::pair<StringRef, StringRef> ret = s.split(';'); + if (ret.second.empty()) + error(arg->getSpelling() + " expects 'old;new' format, but got " + s); + return ret; } // Parse the symbol ordering file and warn for any duplicate entries. -static std::vector<StringRef> getSymbolOrderingFile(MemoryBufferRef MB) { - SetVector<StringRef> Names; - for (StringRef S : args::getLines(MB)) - if (!Names.insert(S) && Config->WarnSymbolOrdering) - warn(MB.getBufferIdentifier() + ": duplicate ordered symbol: " + S); +static std::vector<StringRef> getSymbolOrderingFile(MemoryBufferRef mb) { + SetVector<StringRef> names; + for (StringRef s : args::getLines(mb)) + if (!names.insert(s) && config->warnSymbolOrdering) + warn(mb.getBufferIdentifier() + ": duplicate ordered symbol: " + s); - return Names.takeVector(); + return names.takeVector(); } -static void parseClangOption(StringRef Opt, const Twine &Msg) { - std::string Err; - raw_string_ostream OS(Err); +static void parseClangOption(StringRef opt, const Twine &msg) { + std::string err; + raw_string_ostream os(err); - const char *Argv[] = {Config->ProgName.data(), Opt.data()}; - if (cl::ParseCommandLineOptions(2, Argv, "", &OS)) + const char *argv[] = {config->progName.data(), opt.data()}; + if (cl::ParseCommandLineOptions(2, argv, "", &os)) return; - OS.flush(); - error(Msg + ": " + StringRef(Err).trim()); + os.flush(); + error(msg + ": " + StringRef(err).trim()); } // Initializes Config members by the command line options. -void LinkerDriver::readConfigs(opt::InputArgList &Args) { - errorHandler().Verbose = Args.hasArg(OPT_verbose); - errorHandler().FatalWarnings = - Args.hasFlag(OPT_fatal_warnings, OPT_no_fatal_warnings, false); - ThreadsEnabled = Args.hasFlag(OPT_threads, OPT_no_threads, true); - - Config->AllowMultipleDefinition = - Args.hasFlag(OPT_allow_multiple_definition, +static void readConfigs(opt::InputArgList &args) { + errorHandler().verbose = args.hasArg(OPT_verbose); + errorHandler().fatalWarnings = + args.hasFlag(OPT_fatal_warnings, OPT_no_fatal_warnings, false); + errorHandler().vsDiagnostics = + args.hasArg(OPT_visual_studio_diagnostics_format, false); + threadsEnabled = args.hasFlag(OPT_threads, OPT_no_threads, true); + + config->allowMultipleDefinition = + args.hasFlag(OPT_allow_multiple_definition, OPT_no_allow_multiple_definition, false) || - hasZOption(Args, "muldefs"); - Config->AllowShlibUndefined = - Args.hasFlag(OPT_allow_shlib_undefined, OPT_no_allow_shlib_undefined, - Args.hasArg(OPT_shared)); - Config->AuxiliaryList = args::getStrings(Args, OPT_auxiliary); - Config->Bsymbolic = Args.hasArg(OPT_Bsymbolic); - Config->BsymbolicFunctions = Args.hasArg(OPT_Bsymbolic_functions); - Config->CheckSections = - Args.hasFlag(OPT_check_sections, OPT_no_check_sections, true); - Config->Chroot = Args.getLastArgValue(OPT_chroot); - Config->CompressDebugSections = getCompressDebugSections(Args); - Config->Cref = Args.hasFlag(OPT_cref, OPT_no_cref, false); - Config->DefineCommon = Args.hasFlag(OPT_define_common, OPT_no_define_common, - !Args.hasArg(OPT_relocatable)); - Config->Demangle = Args.hasFlag(OPT_demangle, OPT_no_demangle, true); - Config->DisableVerify = Args.hasArg(OPT_disable_verify); - Config->Discard = getDiscard(Args); - Config->DwoDir = Args.getLastArgValue(OPT_plugin_opt_dwo_dir_eq); - Config->DynamicLinker = getDynamicLinker(Args); - Config->EhFrameHdr = - Args.hasFlag(OPT_eh_frame_hdr, OPT_no_eh_frame_hdr, false); - Config->EmitLLVM = Args.hasArg(OPT_plugin_opt_emit_llvm, false); - Config->EmitRelocs = Args.hasArg(OPT_emit_relocs); - Config->CallGraphProfileSort = Args.hasFlag( + hasZOption(args, "muldefs"); + config->allowShlibUndefined = + args.hasFlag(OPT_allow_shlib_undefined, OPT_no_allow_shlib_undefined, + args.hasArg(OPT_shared)); + config->auxiliaryList = args::getStrings(args, OPT_auxiliary); + config->bsymbolic = args.hasArg(OPT_Bsymbolic); + config->bsymbolicFunctions = args.hasArg(OPT_Bsymbolic_functions); + config->checkSections = + args.hasFlag(OPT_check_sections, OPT_no_check_sections, true); + config->chroot = args.getLastArgValue(OPT_chroot); + config->compressDebugSections = getCompressDebugSections(args); + config->cref = args.hasFlag(OPT_cref, OPT_no_cref, false); + config->defineCommon = args.hasFlag(OPT_define_common, OPT_no_define_common, + !args.hasArg(OPT_relocatable)); + config->demangle = args.hasFlag(OPT_demangle, OPT_no_demangle, true); + config->dependentLibraries = args.hasFlag(OPT_dependent_libraries, OPT_no_dependent_libraries, true); + config->disableVerify = args.hasArg(OPT_disable_verify); + config->discard = getDiscard(args); + config->dwoDir = args.getLastArgValue(OPT_plugin_opt_dwo_dir_eq); + config->dynamicLinker = getDynamicLinker(args); + config->ehFrameHdr = + args.hasFlag(OPT_eh_frame_hdr, OPT_no_eh_frame_hdr, false); + config->emitLLVM = args.hasArg(OPT_plugin_opt_emit_llvm, false); + config->emitRelocs = args.hasArg(OPT_emit_relocs); + config->callGraphProfileSort = args.hasFlag( OPT_call_graph_profile_sort, OPT_no_call_graph_profile_sort, true); - Config->EnableNewDtags = - Args.hasFlag(OPT_enable_new_dtags, OPT_disable_new_dtags, true); - Config->Entry = Args.getLastArgValue(OPT_entry); - Config->ExecuteOnly = - Args.hasFlag(OPT_execute_only, OPT_no_execute_only, false); - Config->ExportDynamic = - Args.hasFlag(OPT_export_dynamic, OPT_no_export_dynamic, false); - Config->FilterList = args::getStrings(Args, OPT_filter); - Config->Fini = Args.getLastArgValue(OPT_fini, "_fini"); - Config->FixCortexA53Errata843419 = Args.hasArg(OPT_fix_cortex_a53_843419); - Config->GcSections = Args.hasFlag(OPT_gc_sections, OPT_no_gc_sections, false); - Config->GnuUnique = Args.hasFlag(OPT_gnu_unique, OPT_no_gnu_unique, true); - Config->GdbIndex = Args.hasFlag(OPT_gdb_index, OPT_no_gdb_index, false); - Config->ICF = getICF(Args); - Config->IgnoreDataAddressEquality = - Args.hasArg(OPT_ignore_data_address_equality); - Config->IgnoreFunctionAddressEquality = - Args.hasArg(OPT_ignore_function_address_equality); - Config->Init = Args.getLastArgValue(OPT_init, "_init"); - Config->LTOAAPipeline = Args.getLastArgValue(OPT_lto_aa_pipeline); - Config->LTODebugPassManager = Args.hasArg(OPT_lto_debug_pass_manager); - Config->LTONewPassManager = Args.hasArg(OPT_lto_new_pass_manager); - Config->LTONewPmPasses = Args.getLastArgValue(OPT_lto_newpm_passes); - Config->LTOO = args::getInteger(Args, OPT_lto_O, 2); - Config->LTOObjPath = Args.getLastArgValue(OPT_plugin_opt_obj_path_eq); - Config->LTOPartitions = args::getInteger(Args, OPT_lto_partitions, 1); - Config->LTOSampleProfile = Args.getLastArgValue(OPT_lto_sample_profile); - Config->MapFile = Args.getLastArgValue(OPT_Map); - Config->MipsGotSize = args::getInteger(Args, OPT_mips_got_size, 0xfff0); - Config->MergeArmExidx = - Args.hasFlag(OPT_merge_exidx_entries, OPT_no_merge_exidx_entries, true); - Config->NoinhibitExec = Args.hasArg(OPT_noinhibit_exec); - Config->Nostdlib = Args.hasArg(OPT_nostdlib); - Config->OFormatBinary = isOutputFormatBinary(Args); - Config->Omagic = Args.hasFlag(OPT_omagic, OPT_no_omagic, false); - Config->OptRemarksFilename = Args.getLastArgValue(OPT_opt_remarks_filename); - Config->OptRemarksWithHotness = Args.hasArg(OPT_opt_remarks_with_hotness); - Config->Optimize = args::getInteger(Args, OPT_O, 1); - Config->OrphanHandling = getOrphanHandling(Args); - Config->OutputFile = Args.getLastArgValue(OPT_o); - Config->Pie = Args.hasFlag(OPT_pie, OPT_no_pie, false); - Config->PrintIcfSections = - Args.hasFlag(OPT_print_icf_sections, OPT_no_print_icf_sections, false); - Config->PrintGcSections = - Args.hasFlag(OPT_print_gc_sections, OPT_no_print_gc_sections, false); - Config->Rpath = getRpath(Args); - Config->Relocatable = Args.hasArg(OPT_relocatable); - Config->SaveTemps = Args.hasArg(OPT_save_temps); - Config->SearchPaths = args::getStrings(Args, OPT_library_path); - Config->SectionStartMap = getSectionStartMap(Args); - Config->Shared = Args.hasArg(OPT_shared); - Config->SingleRoRx = Args.hasArg(OPT_no_rosegment); - Config->SoName = Args.getLastArgValue(OPT_soname); - Config->SortSection = getSortSection(Args); - Config->SplitStackAdjustSize = args::getInteger(Args, OPT_split_stack_adjust_size, 16384); - Config->Strip = getStrip(Args); - Config->Sysroot = Args.getLastArgValue(OPT_sysroot); - Config->Target1Rel = Args.hasFlag(OPT_target1_rel, OPT_target1_abs, false); - Config->Target2 = getTarget2(Args); - Config->ThinLTOCacheDir = Args.getLastArgValue(OPT_thinlto_cache_dir); - Config->ThinLTOCachePolicy = CHECK( - parseCachePruningPolicy(Args.getLastArgValue(OPT_thinlto_cache_policy)), + config->enableNewDtags = + args.hasFlag(OPT_enable_new_dtags, OPT_disable_new_dtags, true); + config->entry = args.getLastArgValue(OPT_entry); + config->executeOnly = + args.hasFlag(OPT_execute_only, OPT_no_execute_only, false); + config->exportDynamic = + args.hasFlag(OPT_export_dynamic, OPT_no_export_dynamic, false); + config->filterList = args::getStrings(args, OPT_filter); + config->fini = args.getLastArgValue(OPT_fini, "_fini"); + config->fixCortexA53Errata843419 = args.hasArg(OPT_fix_cortex_a53_843419); + config->forceBTI = args.hasArg(OPT_force_bti); + config->requireCET = args.hasArg(OPT_require_cet); + config->gcSections = args.hasFlag(OPT_gc_sections, OPT_no_gc_sections, false); + config->gnuUnique = args.hasFlag(OPT_gnu_unique, OPT_no_gnu_unique, true); + config->gdbIndex = args.hasFlag(OPT_gdb_index, OPT_no_gdb_index, false); + config->icf = getICF(args); + config->ignoreDataAddressEquality = + args.hasArg(OPT_ignore_data_address_equality); + config->ignoreFunctionAddressEquality = + args.hasArg(OPT_ignore_function_address_equality); + config->init = args.getLastArgValue(OPT_init, "_init"); + config->ltoAAPipeline = args.getLastArgValue(OPT_lto_aa_pipeline); + config->ltoCSProfileGenerate = args.hasArg(OPT_lto_cs_profile_generate); + config->ltoCSProfileFile = args.getLastArgValue(OPT_lto_cs_profile_file); + config->ltoDebugPassManager = args.hasArg(OPT_lto_debug_pass_manager); + config->ltoNewPassManager = args.hasArg(OPT_lto_new_pass_manager); + config->ltoNewPmPasses = args.getLastArgValue(OPT_lto_newpm_passes); + config->ltoo = args::getInteger(args, OPT_lto_O, 2); + config->ltoObjPath = args.getLastArgValue(OPT_plugin_opt_obj_path_eq); + config->ltoPartitions = args::getInteger(args, OPT_lto_partitions, 1); + config->ltoSampleProfile = args.getLastArgValue(OPT_lto_sample_profile); + config->mapFile = args.getLastArgValue(OPT_Map); + config->mipsGotSize = args::getInteger(args, OPT_mips_got_size, 0xfff0); + config->mergeArmExidx = + args.hasFlag(OPT_merge_exidx_entries, OPT_no_merge_exidx_entries, true); + config->nmagic = args.hasFlag(OPT_nmagic, OPT_no_nmagic, false); + config->noinhibitExec = args.hasArg(OPT_noinhibit_exec); + config->nostdlib = args.hasArg(OPT_nostdlib); + config->oFormatBinary = isOutputFormatBinary(args); + config->omagic = args.hasFlag(OPT_omagic, OPT_no_omagic, false); + config->optRemarksFilename = args.getLastArgValue(OPT_opt_remarks_filename); + config->optRemarksPasses = args.getLastArgValue(OPT_opt_remarks_passes); + config->optRemarksWithHotness = args.hasArg(OPT_opt_remarks_with_hotness); + config->optRemarksFormat = args.getLastArgValue(OPT_opt_remarks_format); + config->optimize = args::getInteger(args, OPT_O, 1); + config->orphanHandling = getOrphanHandling(args); + config->outputFile = args.getLastArgValue(OPT_o); + config->pacPlt = args.hasArg(OPT_pac_plt); + config->pie = args.hasFlag(OPT_pie, OPT_no_pie, false); + config->printIcfSections = + args.hasFlag(OPT_print_icf_sections, OPT_no_print_icf_sections, false); + config->printGcSections = + args.hasFlag(OPT_print_gc_sections, OPT_no_print_gc_sections, false); + config->printSymbolOrder = + args.getLastArgValue(OPT_print_symbol_order); + config->rpath = getRpath(args); + config->relocatable = args.hasArg(OPT_relocatable); + config->saveTemps = args.hasArg(OPT_save_temps); + config->searchPaths = args::getStrings(args, OPT_library_path); + config->sectionStartMap = getSectionStartMap(args); + config->shared = args.hasArg(OPT_shared); + config->singleRoRx = args.hasArg(OPT_no_rosegment); + config->soName = args.getLastArgValue(OPT_soname); + config->sortSection = getSortSection(args); + config->splitStackAdjustSize = args::getInteger(args, OPT_split_stack_adjust_size, 16384); + config->strip = getStrip(args); + config->sysroot = args.getLastArgValue(OPT_sysroot); + config->target1Rel = args.hasFlag(OPT_target1_rel, OPT_target1_abs, false); + config->target2 = getTarget2(args); + config->thinLTOCacheDir = args.getLastArgValue(OPT_thinlto_cache_dir); + config->thinLTOCachePolicy = CHECK( + parseCachePruningPolicy(args.getLastArgValue(OPT_thinlto_cache_policy)), "--thinlto-cache-policy: invalid cache policy"); - Config->ThinLTOEmitImportsFiles = - Args.hasArg(OPT_plugin_opt_thinlto_emit_imports_files); - Config->ThinLTOIndexOnly = Args.hasArg(OPT_plugin_opt_thinlto_index_only) || - Args.hasArg(OPT_plugin_opt_thinlto_index_only_eq); - Config->ThinLTOIndexOnlyArg = - Args.getLastArgValue(OPT_plugin_opt_thinlto_index_only_eq); - Config->ThinLTOJobs = args::getInteger(Args, OPT_thinlto_jobs, -1u); - Config->ThinLTOObjectSuffixReplace = - getOldNewOptions(Args, OPT_plugin_opt_thinlto_object_suffix_replace_eq); - Config->ThinLTOPrefixReplace = - getOldNewOptions(Args, OPT_plugin_opt_thinlto_prefix_replace_eq); - Config->Trace = Args.hasArg(OPT_trace); - Config->Undefined = args::getStrings(Args, OPT_undefined); - Config->UndefinedVersion = - Args.hasFlag(OPT_undefined_version, OPT_no_undefined_version, true); - Config->UseAndroidRelrTags = Args.hasFlag( + config->thinLTOEmitImportsFiles = + args.hasArg(OPT_plugin_opt_thinlto_emit_imports_files); + config->thinLTOIndexOnly = args.hasArg(OPT_plugin_opt_thinlto_index_only) || + args.hasArg(OPT_plugin_opt_thinlto_index_only_eq); + config->thinLTOIndexOnlyArg = + args.getLastArgValue(OPT_plugin_opt_thinlto_index_only_eq); + config->thinLTOJobs = args::getInteger(args, OPT_thinlto_jobs, -1u); + config->thinLTOObjectSuffixReplace = + getOldNewOptions(args, OPT_plugin_opt_thinlto_object_suffix_replace_eq); + config->thinLTOPrefixReplace = + getOldNewOptions(args, OPT_plugin_opt_thinlto_prefix_replace_eq); + config->trace = args.hasArg(OPT_trace); + config->undefined = args::getStrings(args, OPT_undefined); + config->undefinedVersion = + args.hasFlag(OPT_undefined_version, OPT_no_undefined_version, true); + config->useAndroidRelrTags = args.hasFlag( OPT_use_android_relr_tags, OPT_no_use_android_relr_tags, false); - Config->UnresolvedSymbols = getUnresolvedSymbolPolicy(Args); - Config->WarnBackrefs = - Args.hasFlag(OPT_warn_backrefs, OPT_no_warn_backrefs, false); - Config->WarnCommon = Args.hasFlag(OPT_warn_common, OPT_no_warn_common, false); - Config->WarnIfuncTextrel = - Args.hasFlag(OPT_warn_ifunc_textrel, OPT_no_warn_ifunc_textrel, false); - Config->WarnSymbolOrdering = - Args.hasFlag(OPT_warn_symbol_ordering, OPT_no_warn_symbol_ordering, true); - Config->ZCombreloc = getZFlag(Args, "combreloc", "nocombreloc", true); - Config->ZCopyreloc = getZFlag(Args, "copyreloc", "nocopyreloc", true); - Config->ZExecstack = getZFlag(Args, "execstack", "noexecstack", false); - Config->ZGlobal = hasZOption(Args, "global"); - Config->ZHazardplt = hasZOption(Args, "hazardplt"); - Config->ZIfuncNoplt = hasZOption(Args, "ifunc-noplt"); - Config->ZInitfirst = hasZOption(Args, "initfirst"); - Config->ZInterpose = hasZOption(Args, "interpose"); - Config->ZKeepTextSectionPrefix = getZFlag( - Args, "keep-text-section-prefix", "nokeep-text-section-prefix", false); - Config->ZNodefaultlib = hasZOption(Args, "nodefaultlib"); - Config->ZNodelete = hasZOption(Args, "nodelete"); - Config->ZNodlopen = hasZOption(Args, "nodlopen"); - Config->ZNow = getZFlag(Args, "now", "lazy", false); - Config->ZOrigin = hasZOption(Args, "origin"); - Config->ZRelro = getZFlag(Args, "relro", "norelro", true); - Config->ZRetpolineplt = hasZOption(Args, "retpolineplt"); - Config->ZRodynamic = hasZOption(Args, "rodynamic"); - Config->ZStackSize = args::getZOptionValue(Args, OPT_z, "stack-size", 0); - Config->ZText = getZFlag(Args, "text", "notext", true); - Config->ZWxneeded = hasZOption(Args, "wxneeded"); + config->unresolvedSymbols = getUnresolvedSymbolPolicy(args); + config->warnBackrefs = + args.hasFlag(OPT_warn_backrefs, OPT_no_warn_backrefs, false); + config->warnCommon = args.hasFlag(OPT_warn_common, OPT_no_warn_common, false); + config->warnIfuncTextrel = + args.hasFlag(OPT_warn_ifunc_textrel, OPT_no_warn_ifunc_textrel, false); + config->warnSymbolOrdering = + args.hasFlag(OPT_warn_symbol_ordering, OPT_no_warn_symbol_ordering, true); + config->zCombreloc = getZFlag(args, "combreloc", "nocombreloc", true); + config->zCopyreloc = getZFlag(args, "copyreloc", "nocopyreloc", true); + config->zExecstack = getZFlag(args, "execstack", "noexecstack", false); + config->zGlobal = hasZOption(args, "global"); + config->zHazardplt = hasZOption(args, "hazardplt"); + config->zIfuncNoplt = hasZOption(args, "ifunc-noplt"); + config->zInitfirst = hasZOption(args, "initfirst"); + config->zInterpose = hasZOption(args, "interpose"); + config->zKeepTextSectionPrefix = getZFlag( + args, "keep-text-section-prefix", "nokeep-text-section-prefix", false); + config->zNodefaultlib = hasZOption(args, "nodefaultlib"); + config->zNodelete = hasZOption(args, "nodelete"); + config->zNodlopen = hasZOption(args, "nodlopen"); + config->zNow = getZFlag(args, "now", "lazy", false); + config->zOrigin = hasZOption(args, "origin"); + config->zRelro = getZFlag(args, "relro", "norelro", true); + config->zRetpolineplt = hasZOption(args, "retpolineplt"); + config->zRodynamic = hasZOption(args, "rodynamic"); + config->zStackSize = args::getZOptionValue(args, OPT_z, "stack-size", 0); + config->zText = getZFlag(args, "text", "notext", true); + config->zWxneeded = hasZOption(args, "wxneeded"); // Parse LTO options. - if (auto *Arg = Args.getLastArg(OPT_plugin_opt_mcpu_eq)) - parseClangOption(Saver.save("-mcpu=" + StringRef(Arg->getValue())), - Arg->getSpelling()); + if (auto *arg = args.getLastArg(OPT_plugin_opt_mcpu_eq)) + parseClangOption(saver.save("-mcpu=" + StringRef(arg->getValue())), + arg->getSpelling()); - for (auto *Arg : Args.filtered(OPT_plugin_opt)) - parseClangOption(Arg->getValue(), Arg->getSpelling()); + for (auto *arg : args.filtered(OPT_plugin_opt)) + parseClangOption(arg->getValue(), arg->getSpelling()); // Parse -mllvm options. - for (auto *Arg : Args.filtered(OPT_mllvm)) - parseClangOption(Arg->getValue(), Arg->getSpelling()); + for (auto *arg : args.filtered(OPT_mllvm)) + parseClangOption(arg->getValue(), arg->getSpelling()); - if (Config->LTOO > 3) - error("invalid optimization level for LTO: " + Twine(Config->LTOO)); - if (Config->LTOPartitions == 0) + if (config->ltoo > 3) + error("invalid optimization level for LTO: " + Twine(config->ltoo)); + if (config->ltoPartitions == 0) error("--lto-partitions: number of threads must be > 0"); - if (Config->ThinLTOJobs == 0) + if (config->thinLTOJobs == 0) error("--thinlto-jobs: number of threads must be > 0"); - if (Config->SplitStackAdjustSize < 0) + if (config->splitStackAdjustSize < 0) error("--split-stack-adjust-size: size must be >= 0"); // Parse ELF{32,64}{LE,BE} and CPU type. - if (auto *Arg = Args.getLastArg(OPT_m)) { - StringRef S = Arg->getValue(); - std::tie(Config->EKind, Config->EMachine, Config->OSABI) = - parseEmulation(S); - Config->MipsN32Abi = (S == "elf32btsmipn32" || S == "elf32ltsmipn32"); - Config->Emulation = S; + if (auto *arg = args.getLastArg(OPT_m)) { + StringRef s = arg->getValue(); + std::tie(config->ekind, config->emachine, config->osabi) = + parseEmulation(s); + config->mipsN32Abi = (s == "elf32btsmipn32" || s == "elf32ltsmipn32"); + config->emulation = s; } // Parse -hash-style={sysv,gnu,both}. - if (auto *Arg = Args.getLastArg(OPT_hash_style)) { - StringRef S = Arg->getValue(); - if (S == "sysv") - Config->SysvHash = true; - else if (S == "gnu") - Config->GnuHash = true; - else if (S == "both") - Config->SysvHash = Config->GnuHash = true; + if (auto *arg = args.getLastArg(OPT_hash_style)) { + StringRef s = arg->getValue(); + if (s == "sysv") + config->sysvHash = true; + else if (s == "gnu") + config->gnuHash = true; + else if (s == "both") + config->sysvHash = config->gnuHash = true; else - error("unknown -hash-style: " + S); + error("unknown -hash-style: " + s); } - if (Args.hasArg(OPT_print_map)) - Config->MapFile = "-"; - - // --omagic is an option to create old-fashioned executables in which - // .text segments are writable. Today, the option is still in use to - // create special-purpose programs such as boot loaders. It doesn't - // make sense to create PT_GNU_RELRO for such executables. - if (Config->Omagic) - Config->ZRelro = false; - - std::tie(Config->BuildId, Config->BuildIdVector) = getBuildId(Args); - - std::tie(Config->AndroidPackDynRelocs, Config->RelrPackDynRelocs) = - getPackDynRelocs(Args); - - if (auto *Arg = Args.getLastArg(OPT_symbol_ordering_file)) - if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue())) - Config->SymbolOrderingFile = getSymbolOrderingFile(*Buffer); + if (args.hasArg(OPT_print_map)) + config->mapFile = "-"; + + // Page alignment can be disabled by the -n (--nmagic) and -N (--omagic). + // As PT_GNU_RELRO relies on Paging, do not create it when we have disabled + // it. + if (config->nmagic || config->omagic) + config->zRelro = false; + + std::tie(config->buildId, config->buildIdVector) = getBuildId(args); + + std::tie(config->androidPackDynRelocs, config->relrPackDynRelocs) = + getPackDynRelocs(args); + + if (auto *arg = args.getLastArg(OPT_symbol_ordering_file)){ + if (args.hasArg(OPT_call_graph_ordering_file)) + error("--symbol-ordering-file and --call-graph-order-file " + "may not be used together"); + if (Optional<MemoryBufferRef> buffer = readFile(arg->getValue())){ + config->symbolOrderingFile = getSymbolOrderingFile(*buffer); + // Also need to disable CallGraphProfileSort to prevent + // LLD order symbols with CGProfile + config->callGraphProfileSort = false; + } + } // If --retain-symbol-file is used, we'll keep only the symbols listed in // the file and discard all others. - if (auto *Arg = Args.getLastArg(OPT_retain_symbols_file)) { - Config->DefaultSymbolVersion = VER_NDX_LOCAL; - if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue())) - for (StringRef S : args::getLines(*Buffer)) - Config->VersionScriptGlobals.push_back( - {S, /*IsExternCpp*/ false, /*HasWildcard*/ false}); + if (auto *arg = args.getLastArg(OPT_retain_symbols_file)) { + config->defaultSymbolVersion = VER_NDX_LOCAL; + if (Optional<MemoryBufferRef> buffer = readFile(arg->getValue())) + for (StringRef s : args::getLines(*buffer)) + config->versionScriptGlobals.push_back( + {s, /*IsExternCpp*/ false, /*HasWildcard*/ false}); } - bool HasExportDynamic = - Args.hasFlag(OPT_export_dynamic, OPT_no_export_dynamic, false); + bool hasExportDynamic = + args.hasFlag(OPT_export_dynamic, OPT_no_export_dynamic, false); // Parses -dynamic-list and -export-dynamic-symbol. They make some // symbols private. Note that -export-dynamic takes precedence over them // as it says all symbols should be exported. - if (!HasExportDynamic) { - for (auto *Arg : Args.filtered(OPT_dynamic_list)) - if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue())) - readDynamicList(*Buffer); - - for (auto *Arg : Args.filtered(OPT_export_dynamic_symbol)) - Config->DynamicList.push_back( - {Arg->getValue(), /*IsExternCpp*/ false, /*HasWildcard*/ false}); + if (!hasExportDynamic) { + for (auto *arg : args.filtered(OPT_dynamic_list)) + if (Optional<MemoryBufferRef> buffer = readFile(arg->getValue())) + readDynamicList(*buffer); + + for (auto *arg : args.filtered(OPT_export_dynamic_symbol)) + config->dynamicList.push_back( + {arg->getValue(), /*IsExternCpp*/ false, /*HasWildcard*/ false}); } // If --export-dynamic-symbol=foo is given and symbol foo is defined in // an object file in an archive file, that object file should be pulled // out and linked. (It doesn't have to behave like that from technical // point of view, but this is needed for compatibility with GNU.) - for (auto *Arg : Args.filtered(OPT_export_dynamic_symbol)) - Config->Undefined.push_back(Arg->getValue()); + for (auto *arg : args.filtered(OPT_export_dynamic_symbol)) + config->undefined.push_back(arg->getValue()); - for (auto *Arg : Args.filtered(OPT_version_script)) - if (Optional<std::string> Path = searchScript(Arg->getValue())) { - if (Optional<MemoryBufferRef> Buffer = readFile(*Path)) - readVersionScript(*Buffer); + for (auto *arg : args.filtered(OPT_version_script)) + if (Optional<std::string> path = searchScript(arg->getValue())) { + if (Optional<MemoryBufferRef> buffer = readFile(*path)) + readVersionScript(*buffer); } else { - error(Twine("cannot find version script ") + Arg->getValue()); + error(Twine("cannot find version script ") + arg->getValue()); } } @@ -1003,18 +1055,18 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) { // command line options, but computed based on other Config values. // This function initialize such members. See Config.h for the details // of these values. -static void setConfigs(opt::InputArgList &Args) { - ELFKind K = Config->EKind; - uint16_t M = Config->EMachine; - - Config->CopyRelocs = (Config->Relocatable || Config->EmitRelocs); - Config->Is64 = (K == ELF64LEKind || K == ELF64BEKind); - Config->IsLE = (K == ELF32LEKind || K == ELF64LEKind); - Config->Endianness = Config->IsLE ? endianness::little : endianness::big; - Config->IsMips64EL = (K == ELF64LEKind && M == EM_MIPS); - Config->Pic = Config->Pie || Config->Shared; - Config->PicThunk = Args.hasArg(OPT_pic_veneer, Config->Pic); - Config->Wordsize = Config->Is64 ? 8 : 4; +static void setConfigs(opt::InputArgList &args) { + ELFKind k = config->ekind; + uint16_t m = config->emachine; + + config->copyRelocs = (config->relocatable || config->emitRelocs); + config->is64 = (k == ELF64LEKind || k == ELF64BEKind); + config->isLE = (k == ELF32LEKind || k == ELF64LEKind); + config->endianness = config->isLE ? endianness::little : endianness::big; + config->isMips64EL = (k == ELF64LEKind && m == EM_MIPS); + config->isPic = config->pie || config->shared; + config->picThunk = args.hasArg(OPT_pic_veneer, config->isPic); + config->wordsize = config->is64 ? 8 : 4; // ELF defines two different ways to store relocation addends as shown below: // @@ -1029,148 +1081,150 @@ static void setConfigs(opt::InputArgList &Args) { // You cannot choose which one, Rel or Rela, you want to use. Instead each // ABI defines which one you need to use. The following expression expresses // that. - Config->IsRela = M == EM_AARCH64 || M == EM_AMDGPU || M == EM_HEXAGON || - M == EM_PPC || M == EM_PPC64 || M == EM_RISCV || - M == EM_X86_64; + config->isRela = m == EM_AARCH64 || m == EM_AMDGPU || m == EM_HEXAGON || + m == EM_PPC || m == EM_PPC64 || m == EM_RISCV || + m == EM_X86_64; // If the output uses REL relocations we must store the dynamic relocation // addends to the output sections. We also store addends for RELA relocations // if --apply-dynamic-relocs is used. // We default to not writing the addends when using RELA relocations since // any standard conforming tool can find it in r_addend. - Config->WriteAddends = Args.hasFlag(OPT_apply_dynamic_relocs, + config->writeAddends = args.hasFlag(OPT_apply_dynamic_relocs, OPT_no_apply_dynamic_relocs, false) || - !Config->IsRela; + !config->isRela; - Config->TocOptimize = - Args.hasFlag(OPT_toc_optimize, OPT_no_toc_optimize, M == EM_PPC64); + config->tocOptimize = + args.hasFlag(OPT_toc_optimize, OPT_no_toc_optimize, m == EM_PPC64); } // Returns a value of "-format" option. -static bool isFormatBinary(StringRef S) { - if (S == "binary") +static bool isFormatBinary(StringRef s) { + if (s == "binary") return true; - if (S == "elf" || S == "default") + if (s == "elf" || s == "default") return false; - error("unknown -format value: " + S + + error("unknown -format value: " + s + " (supported formats: elf, default, binary)"); return false; } -void LinkerDriver::createFiles(opt::InputArgList &Args) { +void LinkerDriver::createFiles(opt::InputArgList &args) { // For --{push,pop}-state. - std::vector<std::tuple<bool, bool, bool>> Stack; + std::vector<std::tuple<bool, bool, bool>> stack; // Iterate over argv to process input files and positional arguments. - for (auto *Arg : Args) { - switch (Arg->getOption().getUnaliasedOption().getID()) { + for (auto *arg : args) { + switch (arg->getOption().getID()) { case OPT_library: - addLibrary(Arg->getValue()); + addLibrary(arg->getValue()); break; case OPT_INPUT: - addFile(Arg->getValue(), /*WithLOption=*/false); + addFile(arg->getValue(), /*withLOption=*/false); break; case OPT_defsym: { - StringRef From; - StringRef To; - std::tie(From, To) = StringRef(Arg->getValue()).split('='); - if (From.empty() || To.empty()) - error("-defsym: syntax error: " + StringRef(Arg->getValue())); + StringRef from; + StringRef to; + std::tie(from, to) = StringRef(arg->getValue()).split('='); + if (from.empty() || to.empty()) + error("-defsym: syntax error: " + StringRef(arg->getValue())); else - readDefsym(From, MemoryBufferRef(To, "-defsym")); + readDefsym(from, MemoryBufferRef(to, "-defsym")); break; } case OPT_script: - if (Optional<std::string> Path = searchScript(Arg->getValue())) { - if (Optional<MemoryBufferRef> MB = readFile(*Path)) - readLinkerScript(*MB); + if (Optional<std::string> path = searchScript(arg->getValue())) { + if (Optional<MemoryBufferRef> mb = readFile(*path)) + readLinkerScript(*mb); break; } - error(Twine("cannot find linker script ") + Arg->getValue()); + error(Twine("cannot find linker script ") + arg->getValue()); break; case OPT_as_needed: - Config->AsNeeded = true; + config->asNeeded = true; break; case OPT_format: - Config->FormatBinary = isFormatBinary(Arg->getValue()); + config->formatBinary = isFormatBinary(arg->getValue()); break; case OPT_no_as_needed: - Config->AsNeeded = false; + config->asNeeded = false; break; case OPT_Bstatic: - Config->Static = true; + case OPT_omagic: + case OPT_nmagic: + config->isStatic = true; break; case OPT_Bdynamic: - Config->Static = false; + config->isStatic = false; break; case OPT_whole_archive: - InWholeArchive = true; + inWholeArchive = true; break; case OPT_no_whole_archive: - InWholeArchive = false; + inWholeArchive = false; break; case OPT_just_symbols: - if (Optional<MemoryBufferRef> MB = readFile(Arg->getValue())) { - Files.push_back(createObjectFile(*MB)); - Files.back()->JustSymbols = true; + if (Optional<MemoryBufferRef> mb = readFile(arg->getValue())) { + files.push_back(createObjectFile(*mb)); + files.back()->justSymbols = true; } break; case OPT_start_group: - if (InputFile::IsInGroup) + if (InputFile::isInGroup) error("nested --start-group"); - InputFile::IsInGroup = true; + InputFile::isInGroup = true; break; case OPT_end_group: - if (!InputFile::IsInGroup) + if (!InputFile::isInGroup) error("stray --end-group"); - InputFile::IsInGroup = false; - ++InputFile::NextGroupId; + InputFile::isInGroup = false; + ++InputFile::nextGroupId; break; case OPT_start_lib: - if (InLib) + if (inLib) error("nested --start-lib"); - if (InputFile::IsInGroup) + if (InputFile::isInGroup) error("may not nest --start-lib in --start-group"); - InLib = true; - InputFile::IsInGroup = true; + inLib = true; + InputFile::isInGroup = true; break; case OPT_end_lib: - if (!InLib) + if (!inLib) error("stray --end-lib"); - InLib = false; - InputFile::IsInGroup = false; - ++InputFile::NextGroupId; + inLib = false; + InputFile::isInGroup = false; + ++InputFile::nextGroupId; break; case OPT_push_state: - Stack.emplace_back(Config->AsNeeded, Config->Static, InWholeArchive); + stack.emplace_back(config->asNeeded, config->isStatic, inWholeArchive); break; case OPT_pop_state: - if (Stack.empty()) { + if (stack.empty()) { error("unbalanced --push-state/--pop-state"); break; } - std::tie(Config->AsNeeded, Config->Static, InWholeArchive) = Stack.back(); - Stack.pop_back(); + std::tie(config->asNeeded, config->isStatic, inWholeArchive) = stack.back(); + stack.pop_back(); break; } } - if (Files.empty() && errorCount() == 0) + if (files.empty() && errorCount() == 0) error("no input files"); } // If -m <machine_type> was not given, infer it from object files. void LinkerDriver::inferMachineType() { - if (Config->EKind != ELFNoneKind) + if (config->ekind != ELFNoneKind) return; - for (InputFile *F : Files) { - if (F->EKind == ELFNoneKind) + for (InputFile *f : files) { + if (f->ekind == ELFNoneKind) continue; - Config->EKind = F->EKind; - Config->EMachine = F->EMachine; - Config->OSABI = F->OSABI; - Config->MipsN32Abi = Config->EMachine == EM_MIPS && isMipsN32Abi(F); + config->ekind = f->ekind; + config->emachine = f->emachine; + config->osabi = f->osabi; + config->mipsN32Abi = config->emachine == EM_MIPS && isMipsN32Abi(f); return; } error("target emulation unknown: -m or at least one .o file required"); @@ -1178,49 +1232,72 @@ void LinkerDriver::inferMachineType() { // Parse -z max-page-size=<value>. The default value is defined by // each target. -static uint64_t getMaxPageSize(opt::InputArgList &Args) { - uint64_t Val = args::getZOptionValue(Args, OPT_z, "max-page-size", - Target->DefaultMaxPageSize); - if (!isPowerOf2_64(Val)) +static uint64_t getMaxPageSize(opt::InputArgList &args) { + uint64_t val = args::getZOptionValue(args, OPT_z, "max-page-size", + target->defaultMaxPageSize); + if (!isPowerOf2_64(val)) error("max-page-size: value isn't a power of 2"); - return Val; + if (config->nmagic || config->omagic) { + if (val != target->defaultMaxPageSize) + warn("-z max-page-size set, but paging disabled by omagic or nmagic"); + return 1; + } + return val; +} + +// Parse -z common-page-size=<value>. The default value is defined by +// each target. +static uint64_t getCommonPageSize(opt::InputArgList &args) { + uint64_t val = args::getZOptionValue(args, OPT_z, "common-page-size", + target->defaultCommonPageSize); + if (!isPowerOf2_64(val)) + error("common-page-size: value isn't a power of 2"); + if (config->nmagic || config->omagic) { + if (val != target->defaultCommonPageSize) + warn("-z common-page-size set, but paging disabled by omagic or nmagic"); + return 1; + } + // commonPageSize can't be larger than maxPageSize. + if (val > config->maxPageSize) + val = config->maxPageSize; + return val; } // Parses -image-base option. -static Optional<uint64_t> getImageBase(opt::InputArgList &Args) { - // Because we are using "Config->MaxPageSize" here, this function has to be +static Optional<uint64_t> getImageBase(opt::InputArgList &args) { + // Because we are using "Config->maxPageSize" here, this function has to be // called after the variable is initialized. - auto *Arg = Args.getLastArg(OPT_image_base); - if (!Arg) + auto *arg = args.getLastArg(OPT_image_base); + if (!arg) return None; - StringRef S = Arg->getValue(); - uint64_t V; - if (!to_integer(S, V)) { - error("-image-base: number expected, but got " + S); + StringRef s = arg->getValue(); + uint64_t v; + if (!to_integer(s, v)) { + error("-image-base: number expected, but got " + s); return 0; } - if ((V % Config->MaxPageSize) != 0) - warn("-image-base: address isn't multiple of page size: " + S); - return V; + if ((v % config->maxPageSize) != 0) + warn("-image-base: address isn't multiple of page size: " + s); + return v; } // Parses `--exclude-libs=lib,lib,...`. // The library names may be delimited by commas or colons. -static DenseSet<StringRef> getExcludeLibs(opt::InputArgList &Args) { - DenseSet<StringRef> Ret; - for (auto *Arg : Args.filtered(OPT_exclude_libs)) { - StringRef S = Arg->getValue(); +static DenseSet<StringRef> getExcludeLibs(opt::InputArgList &args) { + DenseSet<StringRef> ret; + for (auto *arg : args.filtered(OPT_exclude_libs)) { + StringRef s = arg->getValue(); for (;;) { - size_t Pos = S.find_first_of(",:"); - if (Pos == StringRef::npos) + size_t pos = s.find_first_of(",:"); + if (pos == StringRef::npos) break; - Ret.insert(S.substr(0, Pos)); - S = S.substr(Pos + 1); + ret.insert(s.substr(0, pos)); + s = s.substr(pos + 1); } - Ret.insert(S); + ret.insert(s); } - return Ret; + return ret; } // Handles the -exclude-libs option. If a static library file is specified @@ -1229,139 +1306,247 @@ static DenseSet<StringRef> getExcludeLibs(opt::InputArgList &Args) { // A special library name "ALL" means all archive files. // // This is not a popular option, but some programs such as bionic libc use it. -template <class ELFT> -static void excludeLibs(opt::InputArgList &Args) { - DenseSet<StringRef> Libs = getExcludeLibs(Args); - bool All = Libs.count("ALL"); - - auto Visit = [&](InputFile *File) { - if (!File->ArchiveName.empty()) - if (All || Libs.count(path::filename(File->ArchiveName))) - for (Symbol *Sym : File->getSymbols()) - if (!Sym->isLocal() && Sym->File == File) - Sym->VersionId = VER_NDX_LOCAL; +static void excludeLibs(opt::InputArgList &args) { + DenseSet<StringRef> libs = getExcludeLibs(args); + bool all = libs.count("ALL"); + + auto visit = [&](InputFile *file) { + if (!file->archiveName.empty()) + if (all || libs.count(path::filename(file->archiveName))) + for (Symbol *sym : file->getSymbols()) + if (!sym->isLocal() && sym->file == file) + sym->versionId = VER_NDX_LOCAL; }; - for (InputFile *File : ObjectFiles) - Visit(File); + for (InputFile *file : objectFiles) + visit(file); - for (BitcodeFile *File : BitcodeFiles) - Visit(File); + for (BitcodeFile *file : bitcodeFiles) + visit(file); } // Force Sym to be entered in the output. Used for -u or equivalent. -template <class ELFT> static void handleUndefined(StringRef Name) { - Symbol *Sym = Symtab->find(Name); - if (!Sym) +static void handleUndefined(Symbol *sym) { + // Since a symbol may not be used inside the program, LTO may + // eliminate it. Mark the symbol as "used" to prevent it. + sym->isUsedInRegularObj = true; + + if (sym->isLazy()) + sym->fetch(); +} + +// As an extention to GNU linkers, lld supports a variant of `-u` +// which accepts wildcard patterns. All symbols that match a given +// pattern are handled as if they were given by `-u`. +static void handleUndefinedGlob(StringRef arg) { + Expected<GlobPattern> pat = GlobPattern::create(arg); + if (!pat) { + error("--undefined-glob: " + toString(pat.takeError())); return; + } - // Since symbol S may not be used inside the program, LTO may - // eliminate it. Mark the symbol as "used" to prevent it. - Sym->IsUsedInRegularObj = true; + std::vector<Symbol *> syms; + symtab->forEachSymbol([&](Symbol *sym) { + // Calling Sym->fetch() from here is not safe because it may + // add new symbols to the symbol table, invalidating the + // current iterator. So we just keep a note. + if (pat->match(sym->getName())) + syms.push_back(sym); + }); - if (Sym->isLazy()) - Symtab->fetchLazy<ELFT>(Sym); + for (Symbol *sym : syms) + handleUndefined(sym); } -template <class ELFT> static void handleLibcall(StringRef Name) { - Symbol *Sym = Symtab->find(Name); - if (!Sym || !Sym->isLazy()) +static void handleLibcall(StringRef name) { + Symbol *sym = symtab->find(name); + if (!sym || !sym->isLazy()) return; - MemoryBufferRef MB; - if (auto *LO = dyn_cast<LazyObject>(Sym)) - MB = LO->File->MB; + MemoryBufferRef mb; + if (auto *lo = dyn_cast<LazyObject>(sym)) + mb = lo->file->mb; else - MB = cast<LazyArchive>(Sym)->getMemberBuffer(); + mb = cast<LazyArchive>(sym)->getMemberBuffer(); - if (isBitcode(MB)) - Symtab->fetchLazy<ELFT>(Sym); + if (isBitcode(mb)) + sym->fetch(); +} + +// Replaces common symbols with defined symbols reside in .bss sections. +// This function is called after all symbol names are resolved. As a +// result, the passes after the symbol resolution won't see any +// symbols of type CommonSymbol. +static void replaceCommonSymbols() { + symtab->forEachSymbol([](Symbol *sym) { + auto *s = dyn_cast<CommonSymbol>(sym); + if (!s) + return; + + auto *bss = make<BssSection>("COMMON", s->size, s->alignment); + bss->file = s->file; + bss->markDead(); + inputSections.push_back(bss); + s->replace(Defined{s->file, s->getName(), s->binding, s->stOther, s->type, + /*value=*/0, s->size, bss}); + }); } // If all references to a DSO happen to be weak, the DSO is not added // to DT_NEEDED. If that happens, we need to eliminate shared symbols // created from the DSO. Otherwise, they become dangling references // that point to a non-existent DSO. -template <class ELFT> static void demoteSharedSymbols() { - for (Symbol *Sym : Symtab->getSymbols()) { - if (auto *S = dyn_cast<SharedSymbol>(Sym)) { - if (!S->getFile<ELFT>().IsNeeded) { - bool Used = S->Used; - replaceSymbol<Undefined>(S, nullptr, S->getName(), STB_WEAK, S->StOther, - S->Type); - S->Used = Used; - } - } - } +static void demoteSharedSymbols() { + symtab->forEachSymbol([](Symbol *sym) { + auto *s = dyn_cast<SharedSymbol>(sym); + if (!s || s->getFile().isNeeded) + return; + + bool used = s->used; + s->replace(Undefined{nullptr, s->getName(), STB_WEAK, s->stOther, s->type}); + s->used = used; + }); } -// The section referred to by S is considered address-significant. Set the -// KeepUnique flag on the section if appropriate. -static void markAddrsig(Symbol *S) { - if (auto *D = dyn_cast_or_null<Defined>(S)) - if (D->Section) +// The section referred to by `s` is considered address-significant. Set the +// keepUnique flag on the section if appropriate. +static void markAddrsig(Symbol *s) { + if (auto *d = dyn_cast_or_null<Defined>(s)) + if (d->section) // We don't need to keep text sections unique under --icf=all even if they // are address-significant. - if (Config->ICF == ICFLevel::Safe || !(D->Section->Flags & SHF_EXECINSTR)) - D->Section->KeepUnique = true; + if (config->icf == ICFLevel::Safe || !(d->section->flags & SHF_EXECINSTR)) + d->section->keepUnique = true; } // Record sections that define symbols mentioned in --keep-unique <symbol> // and symbols referred to by address-significance tables. These sections are // ineligible for ICF. template <class ELFT> -static void findKeepUniqueSections(opt::InputArgList &Args) { - for (auto *Arg : Args.filtered(OPT_keep_unique)) { - StringRef Name = Arg->getValue(); - auto *D = dyn_cast_or_null<Defined>(Symtab->find(Name)); - if (!D || !D->Section) { - warn("could not find symbol " + Name + " to keep unique"); +static void findKeepUniqueSections(opt::InputArgList &args) { + for (auto *arg : args.filtered(OPT_keep_unique)) { + StringRef name = arg->getValue(); + auto *d = dyn_cast_or_null<Defined>(symtab->find(name)); + if (!d || !d->section) { + warn("could not find symbol " + name + " to keep unique"); continue; } - D->Section->KeepUnique = true; + d->section->keepUnique = true; } // --icf=all --ignore-data-address-equality means that we can ignore // the dynsym and address-significance tables entirely. - if (Config->ICF == ICFLevel::All && Config->IgnoreDataAddressEquality) + if (config->icf == ICFLevel::All && config->ignoreDataAddressEquality) return; // Symbols in the dynsym could be address-significant in other executables // or DSOs, so we conservatively mark them as address-significant. - for (Symbol *S : Symtab->getSymbols()) - if (S->includeInDynsym()) - markAddrsig(S); + symtab->forEachSymbol([&](Symbol *sym) { + if (sym->includeInDynsym()) + markAddrsig(sym); + }); // Visit the address-significance table in each object file and mark each // referenced symbol as address-significant. - for (InputFile *F : ObjectFiles) { - auto *Obj = cast<ObjFile<ELFT>>(F); - ArrayRef<Symbol *> Syms = Obj->getSymbols(); - if (Obj->AddrsigSec) { - ArrayRef<uint8_t> Contents = - check(Obj->getObj().getSectionContents(Obj->AddrsigSec)); - 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(F) + ": could not decode addrsig section: " + Err); - markAddrsig(Syms[SymIndex]); - Cur += Size; + for (InputFile *f : objectFiles) { + auto *obj = cast<ObjFile<ELFT>>(f); + ArrayRef<Symbol *> syms = obj->getSymbols(); + if (obj->addrsigSec) { + ArrayRef<uint8_t> contents = + check(obj->getObj().getSectionContents(obj->addrsigSec)); + 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(f) + ": could not decode addrsig section: " + err); + 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); + for (Symbol *s : syms) + markAddrsig(s); } } } -template <class ELFT> static Symbol *addUndefined(StringRef Name) { - return Symtab->addUndefined<ELFT>(Name, STB_GLOBAL, STV_DEFAULT, 0, false, - nullptr); +// This function reads a symbol partition specification section. These sections +// are used to control which partition a symbol is allocated to. See +// https://lld.llvm.org/Partitions.html for more details on partitions. +template <typename ELFT> +static void readSymbolPartitionSection(InputSectionBase *s) { + // Read the relocation that refers to the partition's entry point symbol. + Symbol *sym; + if (s->areRelocsRela) + sym = &s->getFile<ELFT>()->getRelocTargetSym(s->template relas<ELFT>()[0]); + else + sym = &s->getFile<ELFT>()->getRelocTargetSym(s->template rels<ELFT>()[0]); + if (!isa<Defined>(sym) || !sym->includeInDynsym()) + return; + + StringRef partName = reinterpret_cast<const char *>(s->data().data()); + for (Partition &part : partitions) { + if (part.name == partName) { + sym->partition = part.getNumber(); + return; + } + } + + // Forbid partitions from being used on incompatible targets, and forbid them + // from being used together with various linker features that assume a single + // set of output sections. + if (script->hasSectionsCommand) + error(toString(s->file) + + ": partitions cannot be used with the SECTIONS command"); + if (script->hasPhdrsCommands()) + error(toString(s->file) + + ": partitions cannot be used with the PHDRS command"); + if (!config->sectionStartMap.empty()) + error(toString(s->file) + ": partitions cannot be used with " + "--section-start, -Ttext, -Tdata or -Tbss"); + if (config->emachine == EM_MIPS) + error(toString(s->file) + ": partitions cannot be used on this target"); + + // Impose a limit of no more than 254 partitions. This limit comes from the + // sizes of the Partition fields in InputSectionBase and Symbol, as well as + // the amount of space devoted to the partition number in RankFlags. + if (partitions.size() == 254) + fatal("may not have more than 254 partitions"); + + partitions.emplace_back(); + Partition &newPart = partitions.back(); + newPart.name = partName; + sym->partition = newPart.getNumber(); +} + +static Symbol *addUndefined(StringRef name) { + return symtab->addSymbol( + Undefined{nullptr, name, STB_GLOBAL, STV_DEFAULT, 0}); +} + +// This function is where all the optimizations of link-time +// optimization takes place. When LTO is in use, some input files are +// not in native object file format but in the LLVM bitcode format. +// This function compiles bitcode files into a few big native files +// using LLVM functions and replaces bitcode symbols with the results. +// Because all bitcode files that the program consists of are passed to +// the compiler at once, it can do a whole-program optimization. +template <class ELFT> void LinkerDriver::compileBitcodeFiles() { + // Compile bitcode files and replace bitcode symbols. + lto.reset(new BitcodeCompiler); + for (BitcodeFile *file : bitcodeFiles) + lto->add(*file); + + for (InputFile *file : lto->compile()) { + auto *obj = cast<ObjFile<ELFT>>(file); + obj->parse(/*ignoreComdats=*/true); + for (Symbol *sym : obj->getGlobalSymbols()) + sym->parseSymbolVersion(); + objectFiles.push_back(file); + } } // The --wrap option is a feature to rename symbols so that you can write @@ -1373,9 +1558,9 @@ template <class ELFT> static Symbol *addUndefined(StringRef Name) { // // This data structure is instantiated for each -wrap option. struct WrappedSymbol { - Symbol *Sym; - Symbol *Real; - Symbol *Wrap; + Symbol *sym; + Symbol *real; + Symbol *wrap; }; // Handles -wrap option. @@ -1383,34 +1568,33 @@ struct WrappedSymbol { // This function instantiates wrapper symbols. At this point, they seem // like they are not being used at all, so we explicitly set some flags so // that LTO won't eliminate them. -template <class ELFT> -static std::vector<WrappedSymbol> addWrappedSymbols(opt::InputArgList &Args) { - std::vector<WrappedSymbol> V; - DenseSet<StringRef> Seen; +static std::vector<WrappedSymbol> addWrappedSymbols(opt::InputArgList &args) { + std::vector<WrappedSymbol> v; + DenseSet<StringRef> seen; - for (auto *Arg : Args.filtered(OPT_wrap)) { - StringRef Name = Arg->getValue(); - if (!Seen.insert(Name).second) + for (auto *arg : args.filtered(OPT_wrap)) { + StringRef name = arg->getValue(); + if (!seen.insert(name).second) continue; - Symbol *Sym = Symtab->find(Name); - if (!Sym) + Symbol *sym = symtab->find(name); + if (!sym) continue; - Symbol *Real = addUndefined<ELFT>(Saver.save("__real_" + Name)); - Symbol *Wrap = addUndefined<ELFT>(Saver.save("__wrap_" + Name)); - V.push_back({Sym, Real, Wrap}); + Symbol *real = addUndefined(saver.save("__real_" + name)); + Symbol *wrap = addUndefined(saver.save("__wrap_" + name)); + v.push_back({sym, real, wrap}); // We want to tell LTO not to inline symbols to be overwritten // because LTO doesn't know the final symbol contents after renaming. - Real->CanInline = false; - Sym->CanInline = false; + real->canInline = false; + sym->canInline = false; // Tell LTO not to eliminate these symbols. - Sym->IsUsedInRegularObj = true; - Wrap->IsUsedInRegularObj = true; + sym->isUsedInRegularObj = true; + wrap->isUsedInRegularObj = true; } - return V; + return v; } // Do renaming for -wrap by updating pointers to symbols. @@ -1418,27 +1602,63 @@ static std::vector<WrappedSymbol> addWrappedSymbols(opt::InputArgList &Args) { // When this function is executed, only InputFiles and symbol table // contain pointers to symbol objects. We visit them to replace pointers, // so that wrapped symbols are swapped as instructed by the command line. -template <class ELFT> static void wrapSymbols(ArrayRef<WrappedSymbol> Wrapped) { - DenseMap<Symbol *, Symbol *> Map; - for (const WrappedSymbol &W : Wrapped) { - Map[W.Sym] = W.Wrap; - Map[W.Real] = W.Sym; +static void wrapSymbols(ArrayRef<WrappedSymbol> wrapped) { + DenseMap<Symbol *, Symbol *> map; + for (const WrappedSymbol &w : wrapped) { + map[w.sym] = w.wrap; + map[w.real] = w.sym; } // Update pointers in input files. - parallelForEach(ObjectFiles, [&](InputFile *File) { - std::vector<Symbol *> &Syms = File->getMutableSymbols(); - for (size_t I = 0, E = Syms.size(); I != E; ++I) - if (Symbol *S = Map.lookup(Syms[I])) - Syms[I] = S; + parallelForEach(objectFiles, [&](InputFile *file) { + MutableArrayRef<Symbol *> syms = file->getMutableSymbols(); + for (size_t i = 0, e = syms.size(); i != e; ++i) + if (Symbol *s = map.lookup(syms[i])) + syms[i] = s; }); // Update pointers in the symbol table. - for (const WrappedSymbol &W : Wrapped) - Symtab->wrap(W.Sym, W.Real, W.Wrap); + for (const WrappedSymbol &w : wrapped) + symtab->wrap(w.sym, w.real, w.wrap); +} + +// To enable CET (x86's hardware-assited control flow enforcement), each +// source file must be compiled with -fcf-protection. Object files compiled +// with the flag contain feature flags indicating that they are compatible +// with CET. We enable the feature only when all object files are compatible +// with CET. +// +// This function returns the merged feature flags. If 0, we cannot enable CET. +// This is also the case with AARCH64's BTI and PAC which use the similar +// GNU_PROPERTY_AARCH64_FEATURE_1_AND mechanism. +// +// Note that the CET-aware PLT is not implemented yet. We do error +// check only. +template <class ELFT> static uint32_t getAndFeatures() { + if (config->emachine != EM_386 && config->emachine != EM_X86_64 && + config->emachine != EM_AARCH64) + return 0; + + uint32_t ret = -1; + for (InputFile *f : objectFiles) { + uint32_t features = cast<ObjFile<ELFT>>(f)->andFeatures; + if (config->forceBTI && !(features & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)) { + warn(toString(f) + ": --force-bti: file does not have BTI property"); + features |= GNU_PROPERTY_AARCH64_FEATURE_1_BTI; + } else if (!features && config->requireCET) + error(toString(f) + ": --require-cet: file is not compatible with CET"); + ret &= features; + } + + // Force enable pointer authentication Plt, we don't warn in this case as + // this does not require support in the object for correctness. + if (config->pacPlt) + ret |= GNU_PROPERTY_AARCH64_FEATURE_1_PAC; + + return ret; } -static const char *LibcallRoutineNames[] = { +static const char *libcallRoutineNames[] = { #define HANDLE_LIBCALL(code, name) name, #include "llvm/IR/RuntimeLibcalls.def" #undef HANDLE_LIBCALL @@ -1446,53 +1666,48 @@ static const char *LibcallRoutineNames[] = { // Do actual linking. Note that when this function is called, // all linker scripts have already been parsed. -template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) { - Target = getTarget(); - InX<ELFT>::VerSym = nullptr; - InX<ELFT>::VerNeed = nullptr; - - Config->MaxPageSize = getMaxPageSize(Args); - Config->ImageBase = getImageBase(Args); - +template <class ELFT> void LinkerDriver::link(opt::InputArgList &args) { // If a -hash-style option was not given, set to a default value, // which varies depending on the target. - if (!Args.hasArg(OPT_hash_style)) { - if (Config->EMachine == EM_MIPS) - Config->SysvHash = true; + if (!args.hasArg(OPT_hash_style)) { + if (config->emachine == EM_MIPS) + config->sysvHash = true; else - Config->SysvHash = Config->GnuHash = true; + config->sysvHash = config->gnuHash = true; } // Default output filename is "a.out" by the Unix tradition. - if (Config->OutputFile.empty()) - Config->OutputFile = "a.out"; + if (config->outputFile.empty()) + config->outputFile = "a.out"; // Fail early if the output file or map file is not writable. If a user has a // long link, e.g. due to a large LTO link, they do not wish to run it and // find that it failed because there was a mistake in their command-line. - if (auto E = tryCreateFile(Config->OutputFile)) - error("cannot open output file " + Config->OutputFile + ": " + E.message()); - if (auto E = tryCreateFile(Config->MapFile)) - error("cannot open map file " + Config->MapFile + ": " + E.message()); + if (auto e = tryCreateFile(config->outputFile)) + error("cannot open output file " + config->outputFile + ": " + e.message()); + if (auto e = tryCreateFile(config->mapFile)) + error("cannot open map file " + config->mapFile + ": " + e.message()); if (errorCount()) return; // Use default entry point name if no name was given via the command // line nor linker scripts. For some reason, MIPS entry point name is // different from others. - Config->WarnMissingEntry = - (!Config->Entry.empty() || (!Config->Shared && !Config->Relocatable)); - if (Config->Entry.empty() && !Config->Relocatable) - Config->Entry = (Config->EMachine == EM_MIPS) ? "__start" : "_start"; + config->warnMissingEntry = + (!config->entry.empty() || (!config->shared && !config->relocatable)); + if (config->entry.empty() && !config->relocatable) + config->entry = (config->emachine == EM_MIPS) ? "__start" : "_start"; // Handle --trace-symbol. - for (auto *Arg : Args.filtered(OPT_trace_symbol)) - Symtab->trace(Arg->getValue()); + for (auto *arg : args.filtered(OPT_trace_symbol)) + symtab->insert(arg->getValue())->traced = true; // Add all files to the symbol table. This will add almost all - // symbols that we need to the symbol table. - for (InputFile *F : Files) - Symtab->addFile<ELFT>(F); + // symbols that we need to the symbol table. This process might + // add files to the link, via autolinking, these files are always + // appended to the Files vector. + for (size_t i = 0; i < files.size(); ++i) + parseFile(files[i]); // Now that we have every file, we can decide if we will need a // dynamic symbol table. @@ -1500,20 +1715,26 @@ template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) { // producing a shared library. // We also need one if any shared libraries are used and for pie executables // (probably because the dynamic linker needs it). - Config->HasDynSymTab = - !SharedFiles.empty() || Config->Pic || Config->ExportDynamic; + config->hasDynSymTab = + !sharedFiles.empty() || config->isPic || config->exportDynamic; // Some symbols (such as __ehdr_start) are defined lazily only when there // are undefined symbols for them, so we add these to trigger that logic. - for (StringRef Name : Script->ReferencedSymbols) - addUndefined<ELFT>(Name); + for (StringRef name : script->referencedSymbols) + addUndefined(name); // Handle the `--undefined <sym>` options. - for (StringRef S : Config->Undefined) - handleUndefined<ELFT>(S); + for (StringRef arg : config->undefined) + if (Symbol *sym = symtab->find(arg)) + handleUndefined(sym); // If an entry symbol is in a static archive, pull out that file now. - handleUndefined<ELFT>(Config->Entry); + if (Symbol *sym = symtab->find(config->entry)) + handleUndefined(sym); + + // Handle the `--undefined-glob <pattern>` options. + for (StringRef pat : args::getStrings(args, OPT_undefined_glob)) + handleUndefinedGlob(pat); // If any of our inputs are bitcode files, the LTO code generator may create // references to certain library functions that might not be explicit in the @@ -1532,9 +1753,9 @@ template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) { // to, i.e. if the symbol's definition is in bitcode. Any other required // libcall symbols will be added to the link after LTO when we add the LTO // object file to the link. - if (!BitcodeFiles.empty()) - for (const char *S : LibcallRoutineNames) - handleLibcall<ELFT>(S); + if (!bitcodeFiles.empty()) + for (const char *s : libcallRoutineNames) + handleLibcall(s); // Return if there were name resolution errors. if (errorCount()) @@ -1542,27 +1763,27 @@ template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) { // Now when we read all script files, we want to finalize order of linker // script commands, which can be not yet final because of INSERT commands. - Script->processInsertCommands(); + script->processInsertCommands(); // We want to declare linker script's symbols early, // so that we can version them. // They also might be exported if referenced by DSOs. - Script->declareSymbols(); + script->declareSymbols(); // Handle the -exclude-libs option. - if (Args.hasArg(OPT_exclude_libs)) - excludeLibs<ELFT>(Args); + if (args.hasArg(OPT_exclude_libs)) + excludeLibs(args); - // Create ElfHeader early. We need a dummy section in + // Create elfHeader early. We need a dummy section in // addReservedSymbols to mark the created symbols as not absolute. - Out::ElfHeader = make<OutputSection>("", 0, SHF_ALLOC); - Out::ElfHeader->Size = sizeof(typename ELFT::Ehdr); + Out::elfHeader = make<OutputSection>("", 0, SHF_ALLOC); + Out::elfHeader->size = sizeof(typename ELFT::Ehdr); // Create wrapped symbols for -wrap option. - std::vector<WrappedSymbol> Wrapped = addWrappedSymbols<ELFT>(Args); + std::vector<WrappedSymbol> wrapped = addWrappedSymbols(args); // We need to create some reserved symbols such as _end. Create them. - if (!Config->Relocatable) + if (!config->relocatable) addReservedSymbols(); // Apply version scripts. @@ -1570,84 +1791,118 @@ template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) { // For a relocatable output, version scripts don't make sense, and // parsing a symbol version string (e.g. dropping "@ver1" from a symbol // name "foo@ver1") rather do harm, so we don't call this if -r is given. - if (!Config->Relocatable) - Symtab->scanVersionScript(); + if (!config->relocatable) + symtab->scanVersionScript(); // Do link-time optimization if given files are LLVM bitcode files. // This compiles bitcode files into real object files. // // With this the symbol table should be complete. After this, no new names // except a few linker-synthesized ones will be added to the symbol table. - Symtab->addCombinedLTOObject<ELFT>(); + compileBitcodeFiles<ELFT>(); if (errorCount()) return; // If -thinlto-index-only is given, we should create only "index // files" and not object files. Index file creation is already done // in addCombinedLTOObject, so we are done if that's the case. - if (Config->ThinLTOIndexOnly) + if (config->thinLTOIndexOnly) return; // Likewise, --plugin-opt=emit-llvm is an option to make LTO create // an output file in bitcode and exit, so that you can just get a // combined bitcode file. - if (Config->EmitLLVM) + if (config->emitLLVM) return; // Apply symbol renames for -wrap. - if (!Wrapped.empty()) - wrapSymbols<ELFT>(Wrapped); + if (!wrapped.empty()) + wrapSymbols(wrapped); // Now that we have a complete list of input files. // Beyond this point, no new files are added. // Aggregate all input sections into one place. - for (InputFile *F : ObjectFiles) - for (InputSectionBase *S : F->getSections()) - if (S && S != &InputSection::Discarded) - InputSections.push_back(S); - for (BinaryFile *F : BinaryFiles) - for (InputSectionBase *S : F->getSections()) - InputSections.push_back(cast<InputSection>(S)); - - // We do not want to emit debug sections if --strip-all - // or -strip-debug are given. - if (Config->Strip != StripPolicy::None) - llvm::erase_if(InputSections, [](InputSectionBase *S) { - return S->Name.startswith(".debug") || S->Name.startswith(".zdebug"); - }); - - Config->EFlags = Target->calcEFlags(); - - if (Config->EMachine == EM_ARM) { + for (InputFile *f : objectFiles) + for (InputSectionBase *s : f->getSections()) + if (s && s != &InputSection::discarded) + inputSections.push_back(s); + for (BinaryFile *f : binaryFiles) + for (InputSectionBase *s : f->getSections()) + inputSections.push_back(cast<InputSection>(s)); + + llvm::erase_if(inputSections, [](InputSectionBase *s) { + if (s->type == SHT_LLVM_SYMPART) { + readSymbolPartitionSection<ELFT>(s); + return true; + } + + // We do not want to emit debug sections if --strip-all + // or -strip-debug are given. + return config->strip != StripPolicy::None && + (s->name.startswith(".debug") || s->name.startswith(".zdebug")); + }); + + // Now that the number of partitions is fixed, save a pointer to the main + // partition. + mainPart = &partitions[0]; + + // Read .note.gnu.property sections from input object files which + // contain a hint to tweak linker's and loader's behaviors. + config->andFeatures = getAndFeatures<ELFT>(); + + // The Target instance handles target-specific stuff, such as applying + // relocations or writing a PLT section. It also contains target-dependent + // values such as a default image base address. + target = getTarget(); + + config->eflags = target->calcEFlags(); + // maxPageSize (sometimes called abi page size) is the maximum page size that + // the output can be run on. For example if the OS can use 4k or 64k page + // sizes then maxPageSize must be 64k for the output to be useable on both. + // All important alignment decisions must use this value. + config->maxPageSize = getMaxPageSize(args); + // commonPageSize is the most common page size that the output will be run on. + // For example if an OS can use 4k or 64k page sizes and 4k is more common + // than 64k then commonPageSize is set to 4k. commonPageSize can be used for + // optimizations such as DATA_SEGMENT_ALIGN in linker scripts. LLD's use of it + // is limited to writing trap instructions on the last executable segment. + config->commonPageSize = getCommonPageSize(args); + + config->imageBase = getImageBase(args); + + if (config->emachine == EM_ARM) { // FIXME: These warnings can be removed when lld only uses these features // when the input objects have been compiled with an architecture that // supports them. - if (Config->ARMHasBlx == false) + if (config->armHasBlx == false) warn("lld uses blx instruction, no object with architecture supporting " "feature detected"); } // This adds a .comment section containing a version string. We have to add it // before mergeSections because the .comment section is a mergeable section. - if (!Config->Relocatable) - InputSections.push_back(createCommentSection()); + if (!config->relocatable) + inputSections.push_back(createCommentSection()); + + // Replace common symbols with regular symbols. + replaceCommonSymbols(); // Do size optimizations: garbage collection, merging of SHF_MERGE sections // and identical code folding. splitSections<ELFT>(); markLive<ELFT>(); - demoteSharedSymbols<ELFT>(); + demoteSharedSymbols(); mergeSections(); - if (Config->ICF != ICFLevel::None) { - findKeepUniqueSections<ELFT>(Args); + if (config->icf != ICFLevel::None) { + findKeepUniqueSections<ELFT>(args); doIcf<ELFT>(); } // Read the callgraph now that we know what was gced or icfed - if (Config->CallGraphProfileSort) { - if (auto *Arg = Args.getLastArg(OPT_call_graph_ordering_file)) - if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue())) - readCallGraph(*Buffer); + if (config->callGraphProfileSort) { + if (auto *arg = args.getLastArg(OPT_call_graph_ordering_file)) + if (Optional<MemoryBufferRef> buffer = readFile(arg->getValue())) + readCallGraph(*buffer); readCallGraphsFromObjectFiles<ELFT>(); } |