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-rw-r--r--ELF/Driver.cpp553
1 files changed, 402 insertions, 151 deletions
diff --git a/ELF/Driver.cpp b/ELF/Driver.cpp
index c6ca2639236ff..a11dbc7cc47fd 100644
--- a/ELF/Driver.cpp
+++ b/ELF/Driver.cpp
@@ -14,14 +14,17 @@
#include "InputFiles.h"
#include "InputSection.h"
#include "LinkerScript.h"
+#include "Memory.h"
#include "Strings.h"
-#include "SymbolListFile.h"
#include "SymbolTable.h"
#include "Target.h"
+#include "Threads.h"
#include "Writer.h"
+#include "lld/Config/Version.h"
#include "lld/Driver/Driver.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdlib>
@@ -38,48 +41,59 @@ using namespace lld::elf;
Configuration *elf::Config;
LinkerDriver *elf::Driver;
-bool elf::link(ArrayRef<const char *> Args, raw_ostream &Error) {
- HasError = false;
+BumpPtrAllocator elf::BAlloc;
+StringSaver elf::Saver{BAlloc};
+std::vector<SpecificAllocBase *> elf::SpecificAllocBase::Instances;
+
+bool elf::link(ArrayRef<const char *> Args, bool CanExitEarly,
+ raw_ostream &Error) {
+ ErrorCount = 0;
ErrorOS = &Error;
+ Argv0 = Args[0];
- Configuration C;
- LinkerDriver D;
- ScriptConfiguration SC;
- Config = &C;
- Driver = &D;
- ScriptConfig = &SC;
+ Config = make<Configuration>();
+ Driver = make<LinkerDriver>();
+ ScriptConfig = make<ScriptConfiguration>();
- Driver->main(Args);
- return !HasError;
+ Driver->main(Args, CanExitEarly);
+ freeArena();
+ return !ErrorCount;
}
// Parses a linker -m option.
-static std::pair<ELFKind, uint16_t> parseEmulation(StringRef S) {
- if (S.endswith("_fbsd"))
+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)
- .Case("aarch64linux", {ELF64LEKind, EM_AARCH64})
+ .Cases("aarch64elf", "aarch64linux", {ELF64LEKind, EM_AARCH64})
.Case("armelf_linux_eabi", {ELF32LEKind, EM_ARM})
.Case("elf32_x86_64", {ELF32LEKind, EM_X86_64})
.Case("elf32btsmip", {ELF32BEKind, EM_MIPS})
.Case("elf32ltsmip", {ELF32LEKind, EM_MIPS})
+ .Case("elf32btsmipn32", {ELF32BEKind, EM_MIPS})
+ .Case("elf32ltsmipn32", {ELF32LEKind, EM_MIPS})
.Case("elf32ppc", {ELF32BEKind, EM_PPC})
.Case("elf64btsmip", {ELF64BEKind, EM_MIPS})
.Case("elf64ltsmip", {ELF64LEKind, EM_MIPS})
.Case("elf64ppc", {ELF64BEKind, EM_PPC64})
+ .Cases("elf_amd64", "elf_x86_64", {ELF64LEKind, EM_X86_64})
.Case("elf_i386", {ELF32LEKind, EM_386})
- .Case("elf_x86_64", {ELF64LEKind, EM_X86_64})
+ .Case("elf_iamcu", {ELF32LEKind, EM_IAMCU})
.Default({ELFNoneKind, EM_NONE});
if (Ret.first == ELFNoneKind) {
if (S == "i386pe" || S == "i386pep" || S == "thumb2pe")
- error("Windows targets are not supported on the ELF frontend: " + S);
+ error("Windows targets are not supported on the ELF frontend: " + Emul);
else
- error("unknown emulation: " + S);
+ error("unknown emulation: " + Emul);
}
- return Ret;
+ return std::make_tuple(Ret.first, Ret.second, OSABI);
}
// Returns slices of MB by parsing MB as an archive file.
@@ -87,25 +101,28 @@ static std::pair<ELFKind, uint16_t> parseEmulation(StringRef S) {
std::vector<MemoryBufferRef>
LinkerDriver::getArchiveMembers(MemoryBufferRef MB) {
std::unique_ptr<Archive> File =
- check(Archive::create(MB), "failed to parse archive");
+ check(Archive::create(MB),
+ MB.getBufferIdentifier() + ": failed to parse archive");
std::vector<MemoryBufferRef> V;
- Error Err;
+ Error Err = Error::success();
for (const ErrorOr<Archive::Child> &COrErr : File->children(Err)) {
- Archive::Child C = check(COrErr, "could not get the child of the archive " +
- File->getFileName());
+ Archive::Child C =
+ check(COrErr, MB.getBufferIdentifier() +
+ ": could not get the child of the archive");
MemoryBufferRef MBRef =
check(C.getMemoryBufferRef(),
- "could not get the buffer for a child of the archive " +
- File->getFileName());
+ MB.getBufferIdentifier() +
+ ": could not get the buffer for a child of the archive");
V.push_back(MBRef);
}
if (Err)
- Error(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())
- OwningMBs.push_back(std::move(MB));
+ make<std::unique_ptr<MemoryBuffer>>(std::move(MB));
return V;
}
@@ -114,25 +131,28 @@ LinkerDriver::getArchiveMembers(MemoryBufferRef MB) {
// Newly created memory buffers are owned by this driver.
void LinkerDriver::addFile(StringRef Path) {
using namespace sys::fs;
- if (Config->Verbose)
- outs() << Path << "\n";
Optional<MemoryBufferRef> Buffer = readFile(Path);
if (!Buffer.hasValue())
return;
MemoryBufferRef MBRef = *Buffer;
+ if (InBinary) {
+ Files.push_back(make<BinaryFile>(MBRef));
+ return;
+ }
+
switch (identify_magic(MBRef.getBuffer())) {
case file_magic::unknown:
readLinkerScript(MBRef);
return;
case file_magic::archive:
- if (WholeArchive) {
+ if (InWholeArchive) {
for (MemoryBufferRef MB : getArchiveMembers(MBRef))
Files.push_back(createObjectFile(MB, Path));
return;
}
- Files.push_back(make_unique<ArchiveFile>(MBRef));
+ Files.push_back(make<ArchiveFile>(MBRef));
return;
case file_magic::elf_shared_object:
if (Config->Relocatable) {
@@ -143,13 +163,16 @@ void LinkerDriver::addFile(StringRef Path) {
return;
default:
if (InLib)
- Files.push_back(make_unique<LazyObjectFile>(MBRef));
+ Files.push_back(make<LazyObjectFile>(MBRef));
else
Files.push_back(createObjectFile(MBRef));
}
}
Optional<MemoryBufferRef> LinkerDriver::readFile(StringRef Path) {
+ if (Config->Verbose)
+ outs() << Path << "\n";
+
auto MBOrErr = MemoryBuffer::getFile(Path);
if (auto EC = MBOrErr.getError()) {
error(EC, "cannot open " + Path);
@@ -157,7 +180,7 @@ Optional<MemoryBufferRef> LinkerDriver::readFile(StringRef Path) {
}
std::unique_ptr<MemoryBuffer> &MB = *MBOrErr;
MemoryBufferRef MBRef = MB->getMemBufferRef();
- OwningMBs.push_back(std::move(MB)); // take MB ownership
+ make<std::unique_ptr<MemoryBuffer>>(std::move(MB)); // take MB ownership
if (Cpio)
Cpio->append(relativeToRoot(Path), MBRef.getBuffer());
@@ -167,11 +190,10 @@ Optional<MemoryBufferRef> LinkerDriver::readFile(StringRef Path) {
// Add a given library by searching it from input search paths.
void LinkerDriver::addLibrary(StringRef Name) {
- std::string Path = searchLibrary(Name);
- if (Path.empty())
- error("unable to find library -l" + Name);
+ if (Optional<std::string> Path = searchLibrary(Name))
+ addFile(*Path);
else
- addFile(Path);
+ error("unable to find library -l" + Name);
}
// This function is called on startup. We need this for LTO since
@@ -184,12 +206,6 @@ static void initLLVM(opt::InputArgList &Args) {
InitializeAllAsmPrinters();
InitializeAllAsmParsers();
- // This is a flag to discard all but GlobalValue names.
- // We want to enable it by default because it saves memory.
- // Disable it only when a developer option (-save-temps) is given.
- Driver->Context.setDiscardValueNames(!Config->SaveTemps);
- Driver->Context.enableDebugTypeODRUniquing();
-
// Parse and evaluate -mllvm options.
std::vector<const char *> V;
V.push_back("lld (LLVM option parsing)");
@@ -206,9 +222,6 @@ static void checkOptions(opt::InputArgList &Args) {
if (Config->EMachine == EM_MIPS && Config->GnuHash)
error("the .gnu.hash section is not compatible with the MIPS target.");
- if (Config->EMachine == EM_AMDGPU && !Config->Entry.empty())
- error("-e option is not valid for AMDGPU.");
-
if (Config->Pie && Config->Shared)
error("-shared and -pie may not be used together");
@@ -224,8 +237,8 @@ static void checkOptions(opt::InputArgList &Args) {
}
}
-static StringRef
-getString(opt::InputArgList &Args, unsigned Key, StringRef Default = "") {
+static StringRef getString(opt::InputArgList &Args, unsigned Key,
+ StringRef Default = "") {
if (auto *Arg = Args.getLastArg(Key))
return Arg->getValue();
return Default;
@@ -254,33 +267,64 @@ static bool hasZOption(opt::InputArgList &Args, StringRef Key) {
return false;
}
-void LinkerDriver::main(ArrayRef<const char *> ArgsArr) {
+static uint64_t getZOptionValue(opt::InputArgList &Args, StringRef Key,
+ uint64_t Default) {
+ for (auto *Arg : Args.filtered(OPT_z)) {
+ StringRef Value = Arg->getValue();
+ size_t Pos = Value.find("=");
+ if (Pos != StringRef::npos && Key == Value.substr(0, Pos)) {
+ Value = Value.substr(Pos + 1);
+ uint64_t Result;
+ if (Value.getAsInteger(0, Result))
+ error("invalid " + Key + ": " + Value);
+ return Result;
+ }
+ }
+ return Default;
+}
+
+void LinkerDriver::main(ArrayRef<const char *> ArgsArr, bool CanExitEarly) {
ELFOptTable Parser;
opt::InputArgList Args = Parser.parse(ArgsArr.slice(1));
+
+ // Interpret this flag early because error() depends on them.
+ Config->ErrorLimit = getInteger(Args, OPT_error_limit, 20);
+
+ // Handle -help
if (Args.hasArg(OPT_help)) {
printHelp(ArgsArr[0]);
return;
}
- if (Args.hasArg(OPT_version)) {
- outs() << getVersionString();
+
+ // GNU linkers disagree here. Though both -version and -v are mentioned
+ // in help to print the version information, GNU ld just normally exits,
+ // while gold can continue linking. We are compatible with ld.bfd here.
+ if (Args.hasArg(OPT_version) || Args.hasArg(OPT_v))
+ outs() << getLLDVersion() << "\n";
+ if (Args.hasArg(OPT_version))
return;
- }
+
+ Config->ExitEarly = CanExitEarly && !Args.hasArg(OPT_full_shutdown);
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.
- Cpio.reset(CpioFile::create(Path));
- if (Cpio) {
+ ErrorOr<CpioFile *> F = CpioFile::create(Path);
+ if (F) {
+ Cpio.reset(*F);
Cpio->append("response.txt", createResponseFile(Args));
- Cpio->append("version.txt", getVersionString());
- }
+ Cpio->append("version.txt", getLLDVersion() + "\n");
+ } else
+ error(F.getError(),
+ Twine("--reproduce: failed to open ") + Path + ".cpio");
}
readConfigs(Args);
initLLVM(Args);
createFiles(Args);
+ inferMachineType();
checkOptions(Args);
- if (HasError)
+ if (ErrorCount)
return;
switch (Config->EKind) {
@@ -297,7 +341,7 @@ void LinkerDriver::main(ArrayRef<const char *> ArgsArr) {
link<ELF64BE>(Args);
return;
default:
- error("-m or at least a .o file required");
+ llvm_unreachable("unknown Config->EKind");
}
}
@@ -314,10 +358,115 @@ static UnresolvedPolicy getUnresolvedSymbolOption(opt::InputArgList &Args) {
if (S == "ignore-all" || S == "ignore-in-object-files")
return UnresolvedPolicy::Ignore;
if (S == "ignore-in-shared-libs" || S == "report-all")
- return UnresolvedPolicy::Error;
+ return UnresolvedPolicy::ReportError;
error("unknown --unresolved-symbols value: " + S);
}
- return UnresolvedPolicy::Error;
+ return UnresolvedPolicy::ReportError;
+}
+
+static Target2Policy getTarget2Option(opt::InputArgList &Args) {
+ if (auto *Arg = Args.getLastArg(OPT_target2)) {
+ StringRef S = Arg->getValue();
+ if (S == "rel")
+ return Target2Policy::Rel;
+ if (S == "abs")
+ return Target2Policy::Abs;
+ if (S == "got-rel")
+ return Target2Policy::GotRel;
+ error("unknown --target2 option: " + S);
+ }
+ return Target2Policy::GotRel;
+}
+
+static bool isOutputFormatBinary(opt::InputArgList &Args) {
+ if (auto *Arg = Args.getLastArg(OPT_oformat)) {
+ StringRef S = Arg->getValue();
+ if (S == "binary")
+ return true;
+ error("unknown --oformat value: " + S);
+ }
+ return false;
+}
+
+static bool getArg(opt::InputArgList &Args, unsigned K1, unsigned K2,
+ bool Default) {
+ if (auto *Arg = Args.getLastArg(K1, K2))
+ return Arg->getOption().getID() == K1;
+ return Default;
+}
+
+static DiscardPolicy getDiscardOption(opt::InputArgList &Args) {
+ if (Config->Relocatable)
+ return DiscardPolicy::None;
+ 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)
+ return DiscardPolicy::All;
+ if (Arg->getOption().getID() == OPT_discard_locals)
+ return DiscardPolicy::Locals;
+ return DiscardPolicy::None;
+}
+
+static StripPolicy getStripOption(opt::InputArgList &Args) {
+ if (auto *Arg = Args.getLastArg(OPT_strip_all, OPT_strip_debug)) {
+ if (Arg->getOption().getID() == OPT_strip_all)
+ return StripPolicy::All;
+ return StripPolicy::Debug;
+ }
+ return StripPolicy::None;
+}
+
+static uint64_t parseSectionAddress(StringRef S, opt::Arg *Arg) {
+ uint64_t VA = 0;
+ if (S.startswith("0x"))
+ S = S.drop_front(2);
+ if (S.getAsInteger(16, VA))
+ error("invalid argument: " + stringize(Arg));
+ 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);
+ }
+
+ 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;
+}
+
+static SortSectionPolicy getSortKind(opt::InputArgList &Args) {
+ StringRef S = getString(Args, OPT_sort_section);
+ if (S == "alignment")
+ return SortSectionPolicy::Alignment;
+ if (S == "name")
+ return SortSectionPolicy::Name;
+ if (!S.empty())
+ error("unknown --sort-section rule: " + S);
+ return SortSectionPolicy::Default;
+}
+
+static std::vector<StringRef> getLines(MemoryBufferRef MB) {
+ SmallVector<StringRef, 0> Arr;
+ MB.getBuffer().split(Arr, '\n');
+
+ std::vector<StringRef> Ret;
+ for (StringRef S : Arr) {
+ S = S.trim();
+ if (!S.empty())
+ Ret.push_back(S);
+ }
+ return Ret;
}
// Initializes Config members by the command line options.
@@ -334,34 +483,37 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
if (auto *Arg = Args.getLastArg(OPT_m)) {
// Parse ELF{32,64}{LE,BE} and CPU type.
StringRef S = Arg->getValue();
- std::tie(Config->EKind, Config->EMachine) = parseEmulation(S);
+ std::tie(Config->EKind, Config->EMachine, Config->OSABI) =
+ parseEmulation(S);
+ Config->MipsN32Abi = (S == "elf32btsmipn32" || S == "elf32ltsmipn32");
Config->Emulation = S;
}
Config->AllowMultipleDefinition = Args.hasArg(OPT_allow_multiple_definition);
Config->Bsymbolic = Args.hasArg(OPT_Bsymbolic);
Config->BsymbolicFunctions = Args.hasArg(OPT_Bsymbolic_functions);
- Config->Demangle = !Args.hasArg(OPT_no_demangle);
+ Config->Demangle = getArg(Args, OPT_demangle, OPT_no_demangle, true);
Config->DisableVerify = Args.hasArg(OPT_disable_verify);
- Config->DiscardAll = Args.hasArg(OPT_discard_all);
- Config->DiscardLocals = Args.hasArg(OPT_discard_locals);
- Config->DiscardNone = Args.hasArg(OPT_discard_none);
Config->EhFrameHdr = Args.hasArg(OPT_eh_frame_hdr);
Config->EnableNewDtags = !Args.hasArg(OPT_disable_new_dtags);
Config->ExportDynamic = Args.hasArg(OPT_export_dynamic);
Config->FatalWarnings = Args.hasArg(OPT_fatal_warnings);
- Config->GcSections = Args.hasArg(OPT_gc_sections);
+ Config->GcSections = getArg(Args, OPT_gc_sections, OPT_no_gc_sections, false);
+ Config->GdbIndex = Args.hasArg(OPT_gdb_index);
Config->ICF = Args.hasArg(OPT_icf);
Config->NoGnuUnique = Args.hasArg(OPT_no_gnu_unique);
Config->NoUndefinedVersion = Args.hasArg(OPT_no_undefined_version);
- Config->Pie = Args.hasArg(OPT_pie);
+ Config->Nostdlib = Args.hasArg(OPT_nostdlib);
+ Config->OMagic = Args.hasArg(OPT_omagic);
+ Config->Pie = getArg(Args, OPT_pie, OPT_nopie, false);
Config->PrintGcSections = Args.hasArg(OPT_print_gc_sections);
Config->Relocatable = Args.hasArg(OPT_relocatable);
+ Config->Discard = getDiscardOption(Args);
Config->SaveTemps = Args.hasArg(OPT_save_temps);
+ Config->SingleRoRx = Args.hasArg(OPT_no_rosegment);
Config->Shared = Args.hasArg(OPT_shared);
- Config->StripAll = Args.hasArg(OPT_strip_all);
- Config->StripDebug = Args.hasArg(OPT_strip_debug);
- Config->Threads = Args.hasArg(OPT_threads);
+ Config->Target1Rel = getArg(Args, OPT_target1_rel, OPT_target1_abs, false);
+ Config->Threads = getArg(Args, OPT_threads, OPT_no_threads, true);
Config->Trace = Args.hasArg(OPT_trace);
Config->Verbose = Args.hasArg(OPT_verbose);
Config->WarnCommon = Args.hasArg(OPT_warn_common);
@@ -370,33 +522,47 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
Config->Entry = getString(Args, OPT_entry);
Config->Fini = getString(Args, OPT_fini, "_fini");
Config->Init = getString(Args, OPT_init, "_init");
- Config->LtoAAPipeline = getString(Args, OPT_lto_aa_pipeline);
- Config->LtoNewPmPasses = getString(Args, OPT_lto_newpm_passes);
+ Config->LTOAAPipeline = getString(Args, OPT_lto_aa_pipeline);
+ Config->LTONewPmPasses = getString(Args, OPT_lto_newpm_passes);
Config->OutputFile = getString(Args, OPT_o);
Config->SoName = getString(Args, OPT_soname);
Config->Sysroot = getString(Args, OPT_sysroot);
Config->Optimize = getInteger(Args, OPT_O, 1);
- Config->LtoO = getInteger(Args, OPT_lto_O, 2);
- if (Config->LtoO > 3)
+ Config->LTOO = getInteger(Args, OPT_lto_O, 2);
+ if (Config->LTOO > 3)
error("invalid optimization level for LTO: " + getString(Args, OPT_lto_O));
- Config->LtoJobs = getInteger(Args, OPT_lto_jobs, 1);
- if (Config->LtoJobs == 0)
- error("number of threads must be > 0");
+ Config->LTOPartitions = getInteger(Args, OPT_lto_partitions, 1);
+ if (Config->LTOPartitions == 0)
+ error("--lto-partitions: number of threads must be > 0");
+ Config->ThinLTOJobs = getInteger(Args, OPT_thinlto_jobs, -1u);
+ if (Config->ThinLTOJobs == 0)
+ error("--thinlto-jobs: number of threads must be > 0");
Config->ZCombreloc = !hasZOption(Args, "nocombreloc");
- Config->ZExecStack = hasZOption(Args, "execstack");
+ Config->ZExecstack = hasZOption(Args, "execstack");
Config->ZNodelete = hasZOption(Args, "nodelete");
Config->ZNow = hasZOption(Args, "now");
Config->ZOrigin = hasZOption(Args, "origin");
Config->ZRelro = !hasZOption(Args, "norelro");
+ Config->ZStackSize = getZOptionValue(Args, "stack-size", -1);
+ Config->ZWxneeded = hasZOption(Args, "wxneeded");
- if (Config->Relocatable)
- Config->StripAll = false;
+ Config->OFormatBinary = isOutputFormatBinary(Args);
+ Config->SectionStartMap = getSectionStartMap(Args);
+ Config->SortSection = getSortKind(Args);
+ Config->Target2 = getTarget2Option(Args);
+ Config->UnresolvedSymbols = getUnresolvedSymbolOption(Args);
+
+ // --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;
- // --strip-all implies --strip-debug.
- if (Config->StripAll)
- Config->StripDebug = true;
+ if (!Config->Relocatable)
+ Config->Strip = getStripOption(Args);
// Config->Pic is true if we are generating position-independent code.
Config->Pic = Config->Pie || Config->Shared;
@@ -414,13 +580,15 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
// Parse --build-id or --build-id=<style>.
if (Args.hasArg(OPT_build_id))
- Config->BuildId = BuildIdKind::Fnv1;
+ Config->BuildId = BuildIdKind::Fast;
if (auto *Arg = Args.getLastArg(OPT_build_id_eq)) {
StringRef S = Arg->getValue();
if (S == "md5") {
Config->BuildId = BuildIdKind::Md5;
- } else if (S == "sha1") {
+ } else if (S == "sha1" || S == "tree") {
Config->BuildId = BuildIdKind::Sha1;
+ } else if (S == "uuid") {
+ Config->BuildId = BuildIdKind::Uuid;
} else if (S == "none") {
Config->BuildId = BuildIdKind::None;
} else if (S.startswith("0x")) {
@@ -431,21 +599,58 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
}
}
+ for (auto *Arg : Args.filtered(OPT_auxiliary))
+ Config->AuxiliaryList.push_back(Arg->getValue());
+ if (!Config->Shared && !Config->AuxiliaryList.empty())
+ error("-f may not be used without -shared");
+
for (auto *Arg : Args.filtered(OPT_undefined))
Config->Undefined.push_back(Arg->getValue());
- Config->UnresolvedSymbols = getUnresolvedSymbolOption(Args);
-
if (auto *Arg = Args.getLastArg(OPT_dynamic_list))
if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue()))
- parseDynamicList(*Buffer);
+ readDynamicList(*Buffer);
+
+ if (auto *Arg = Args.getLastArg(OPT_symbol_ordering_file))
+ if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue()))
+ Config->SymbolOrderingFile = getLines(*Buffer);
+
+ // If --retain-symbol-file is used, we'll retail only the symbols listed in
+ // the file and discard all others.
+ if (auto *Arg = Args.getLastArg(OPT_retain_symbols_file)) {
+ Config->Discard = DiscardPolicy::RetainFile;
+ if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue()))
+ for (StringRef S : getLines(*Buffer))
+ Config->RetainSymbolsFile.insert(S);
+ }
for (auto *Arg : Args.filtered(OPT_export_dynamic_symbol))
- Config->DynamicList.push_back(Arg->getValue());
+ Config->VersionScriptGlobals.push_back(
+ {Arg->getValue(), /*IsExternCpp*/ false, /*HasWildcard*/ false});
+
+ // Dynamic lists are a simplified linker script that doesn't need the
+ // "global:" and implicitly ends with a "local:*". Set the variables needed to
+ // simulate that.
+ if (Args.hasArg(OPT_dynamic_list) || Args.hasArg(OPT_export_dynamic_symbol)) {
+ Config->ExportDynamic = true;
+ if (!Config->Shared)
+ Config->DefaultSymbolVersion = VER_NDX_LOCAL;
+ }
if (auto *Arg = Args.getLastArg(OPT_version_script))
if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue()))
- parseVersionScript(*Buffer);
+ readVersionScript(*Buffer);
+}
+
+// Returns a value of "-format" option.
+static bool getBinaryOption(StringRef S) {
+ if (S == "binary")
+ return true;
+ if (S == "elf" || S == "default")
+ return false;
+ error("unknown -format value: " + S +
+ " (supported formats: elf, default, binary)");
+ return false;
}
void LinkerDriver::createFiles(opt::InputArgList &Args) {
@@ -454,14 +659,20 @@ void LinkerDriver::createFiles(opt::InputArgList &Args) {
case OPT_l:
addLibrary(Arg->getValue());
break;
- case OPT_alias_script_T:
case OPT_INPUT:
- case OPT_script:
addFile(Arg->getValue());
break;
+ case OPT_alias_script_T:
+ case OPT_script:
+ if (Optional<MemoryBufferRef> MB = readFile(Arg->getValue()))
+ readLinkerScript(*MB);
+ break;
case OPT_as_needed:
Config->AsNeeded = true;
break;
+ case OPT_format:
+ InBinary = getBinaryOption(Arg->getValue());
+ break;
case OPT_no_as_needed:
Config->AsNeeded = false;
break;
@@ -472,10 +683,10 @@ void LinkerDriver::createFiles(opt::InputArgList &Args) {
Config->Static = false;
break;
case OPT_whole_archive:
- WholeArchive = true;
+ InWholeArchive = true;
break;
case OPT_no_whole_archive:
- WholeArchive = false;
+ InWholeArchive = false;
break;
case OPT_start_lib:
InLib = true;
@@ -486,19 +697,55 @@ void LinkerDriver::createFiles(opt::InputArgList &Args) {
}
}
- if (Files.empty() && !HasError)
- error("no input files.");
+ if (Files.empty() && ErrorCount == 0)
+ error("no input files");
+}
- // If -m <machine_type> was not given, infer it from object files.
- if (Config->EKind == ELFNoneKind) {
- for (std::unique_ptr<InputFile> &F : Files) {
- if (F->EKind == ELFNoneKind)
- continue;
- Config->EKind = F->EKind;
- Config->EMachine = F->EMachine;
- break;
- }
+// If -m <machine_type> was not given, infer it from object files.
+void LinkerDriver::inferMachineType() {
+ if (Config->EKind != ELFNoneKind)
+ return;
+
+ 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);
+ return;
}
+ error("target emulation unknown: -m or at least one .o file required");
+}
+
+// Parse -z max-page-size=<value>. The default value is defined by
+// each target.
+static uint64_t getMaxPageSize(opt::InputArgList &Args) {
+ uint64_t Val =
+ getZOptionValue(Args, "max-page-size", Target->DefaultMaxPageSize);
+ if (!isPowerOf2_64(Val))
+ error("max-page-size: value isn't a power of 2");
+ return Val;
+}
+
+// Parses -image-base option.
+static uint64_t getImageBase(opt::InputArgList &Args) {
+ // Use default if no -image-base option is given.
+ // Because we are using "Target" here, this function
+ // has to be called after the variable is initialized.
+ auto *Arg = Args.getLastArg(OPT_image_base);
+ if (!Arg)
+ return Config->Pic ? 0 : Target->DefaultImageBase;
+
+ StringRef S = Arg->getValue();
+ uint64_t V;
+ if (S.getAsInteger(0, 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;
}
// Do actual linking. Note that when this function is called,
@@ -506,66 +753,70 @@ void LinkerDriver::createFiles(opt::InputArgList &Args) {
template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) {
SymbolTable<ELFT> Symtab;
elf::Symtab<ELFT>::X = &Symtab;
+ Target = createTarget();
+ ScriptBase = Script<ELFT>::X = make<LinkerScript<ELFT>>();
- std::unique_ptr<TargetInfo> TI(createTarget());
- Target = TI.get();
- LinkerScript<ELFT> LS;
- Script<ELFT>::X = &LS;
-
- Config->Rela = ELFT::Is64Bits || Config->EMachine == EM_X86_64;
+ Config->Rela =
+ ELFT::Is64Bits || Config->EMachine == EM_X86_64 || Config->MipsN32Abi;
Config->Mips64EL =
(Config->EMachine == EM_MIPS && Config->EKind == ELF64LEKind);
-
- // Add entry symbol. Note that AMDGPU binaries have no entry points.
- if (Config->Entry.empty() && !Config->Shared && !Config->Relocatable &&
- Config->EMachine != EM_AMDGPU)
- Config->Entry = (Config->EMachine == EM_MIPS) ? "__start" : "_start";
+ Config->MaxPageSize = getMaxPageSize(Args);
+ Config->ImageBase = getImageBase(Args);
// Default output filename is "a.out" by the Unix tradition.
if (Config->OutputFile.empty())
Config->OutputFile = "a.out";
+ // 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";
+
// Handle --trace-symbol.
for (auto *Arg : Args.filtered(OPT_trace_symbol))
Symtab.trace(Arg->getValue());
- // Set either EntryAddr (if S is a number) or EntrySym (otherwise).
- if (!Config->Entry.empty()) {
- StringRef S = Config->Entry;
- if (S.getAsInteger(0, Config->EntryAddr))
- Config->EntrySym = Symtab.addUndefined(S);
- }
+ // 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(F);
- // Initialize Config->ImageBase.
- if (auto *Arg = Args.getLastArg(OPT_image_base)) {
- StringRef S = Arg->getValue();
- if (S.getAsInteger(0, Config->ImageBase))
- error(Arg->getSpelling() + ": number expected, but got " + S);
- else if ((Config->ImageBase % Target->PageSize) != 0)
- warning(Arg->getSpelling() + ": address isn't multiple of page size");
- } else {
- Config->ImageBase = Config->Pic ? 0 : Target->DefaultImageBase;
- }
+ // If an entry symbol is in a static archive, pull out that file now
+ // to complete the symbol table. After this, no new names except a
+ // few linker-synthesized ones will be added to the symbol table.
+ if (Symtab.find(Config->Entry))
+ Symtab.addUndefined(Config->Entry);
- for (std::unique_ptr<InputFile> &F : Files)
- Symtab.addFile(std::move(F));
- if (HasError)
- return; // There were duplicate symbols or incompatible files
+ // Return if there were name resolution errors.
+ if (ErrorCount)
+ return;
Symtab.scanUndefinedFlags();
Symtab.scanShlibUndefined();
- Symtab.scanDynamicList();
Symtab.scanVersionScript();
- Symtab.scanSymbolVersions();
- Symtab.addCombinedLtoObject();
- if (HasError)
+ Symtab.addCombinedLTOObject();
+ if (ErrorCount)
return;
for (auto *Arg : Args.filtered(OPT_wrap))
Symtab.wrap(Arg->getValue());
- // Write the result to the file.
+ // 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 (elf::ObjectFile<ELFT> *F : Symtab.getObjectFiles())
+ for (InputSectionBase<ELFT> *S : F->getSections())
+ if (S && S != &InputSection<ELFT>::Discarded)
+ Symtab.Sections.push_back(S);
+ for (BinaryFile *F : Symtab.getBinaryFiles())
+ for (InputSectionData *S : F->getSections())
+ Symtab.Sections.push_back(cast<InputSection<ELFT>>(S));
+
+ // Do size optimizations: garbage collection and identical code folding.
if (Config->GcSections)
markLive<ELFT>();
if (Config->ICF)
@@ -573,16 +824,16 @@ template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) {
// MergeInputSection::splitIntoPieces needs to be called before
// any call of MergeInputSection::getOffset. Do that.
- for (const std::unique_ptr<elf::ObjectFile<ELFT>> &F :
- Symtab.getObjectFiles())
- for (InputSectionBase<ELFT> *S : F->getSections()) {
- if (!S || S == &InputSection<ELFT>::Discarded || !S->Live)
- continue;
- if (S->Compressed)
- S->uncompress();
- if (auto *MS = dyn_cast<MergeInputSection<ELFT>>(S))
- MS->splitIntoPieces();
- }
+ forEach(Symtab.Sections.begin(), Symtab.Sections.end(),
+ [](InputSectionBase<ELFT> *S) {
+ if (!S->Live)
+ return;
+ if (S->isCompressed())
+ S->uncompress();
+ if (auto *MS = dyn_cast<MergeInputSection<ELFT>>(S))
+ MS->splitIntoPieces();
+ });
- writeResult<ELFT>(&Symtab);
+ // Write the result to the file.
+ writeResult<ELFT>();
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-13 03:04:35 +0000