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llvm-mirror/tools/llvm-objcopy/llvm-objcopy.cpp
Jordan Rupprecht 5fd6d96e6e [llvm-objcopy] Add support for --rename-section flags from gnu objcopy 
Summary:
Add support for --rename-section flags from gnu objcopy.

Not all flags appear to have an effect for ELF objects, but allowing them would allow easier drop-in replacement. Other unrecognized flags are rejected.

This was only tested by comparing flags printed by "readelf -e <.o>" against the output of gnu vs llvm objcopy, it hasn't been tested to be valid beyond that.

Reviewers: jakehehrlich, alexshap

Subscribers: llvm-commits, paulsemel, alexshap

Differential Revision: https://reviews.llvm.org/D49870

llvm-svn: 338582
2018-08-01 16:23:22 +00:00

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//===- llvm-objcopy.cpp ---------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm-objcopy.h"
#include "Object.h"
#include "llvm/ADT/BitmaskEnum.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ArchiveWriter.h"
#include "llvm/Object/Binary.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/ELFTypes.h"
#include "llvm/Object/Error.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileOutputBuffer.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstdlib>
#include <functional>
#include <iterator>
#include <memory>
#include <string>
#include <system_error>
#include <utility>
using namespace llvm;
using namespace llvm::objcopy;
using namespace object;
using namespace ELF;
namespace {
enum ObjcopyID {
OBJCOPY_INVALID = 0, // This is not an option ID.
#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
HELPTEXT, METAVAR, VALUES) \
OBJCOPY_##ID,
#include "ObjcopyOpts.inc"
#undef OPTION
};
#define PREFIX(NAME, VALUE) const char *const OBJCOPY_##NAME[] = VALUE;
#include "ObjcopyOpts.inc"
#undef PREFIX
static const opt::OptTable::Info ObjcopyInfoTable[] = {
#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
HELPTEXT, METAVAR, VALUES) \
{OBJCOPY_##PREFIX, \
NAME, \
HELPTEXT, \
METAVAR, \
OBJCOPY_##ID, \
opt::Option::KIND##Class, \
PARAM, \
FLAGS, \
OBJCOPY_##GROUP, \
OBJCOPY_##ALIAS, \
ALIASARGS, \
VALUES},
#include "ObjcopyOpts.inc"
#undef OPTION
};
class ObjcopyOptTable : public opt::OptTable {
public:
ObjcopyOptTable() : OptTable(ObjcopyInfoTable, true) {}
};
enum StripID {
STRIP_INVALID = 0, // This is not an option ID.
#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
HELPTEXT, METAVAR, VALUES) \
STRIP_##ID,
#include "StripOpts.inc"
#undef OPTION
};
#define PREFIX(NAME, VALUE) const char *const STRIP_##NAME[] = VALUE;
#include "StripOpts.inc"
#undef PREFIX
static const opt::OptTable::Info StripInfoTable[] = {
#define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
HELPTEXT, METAVAR, VALUES) \
{STRIP_##PREFIX, NAME, HELPTEXT, \
METAVAR, STRIP_##ID, opt::Option::KIND##Class, \
PARAM, FLAGS, STRIP_##GROUP, \
STRIP_##ALIAS, ALIASARGS, VALUES},
#include "StripOpts.inc"
#undef OPTION
};
class StripOptTable : public opt::OptTable {
public:
StripOptTable() : OptTable(StripInfoTable, true) {}
};
struct SectionRename {
StringRef OriginalName;
StringRef NewName;
Optional<uint64_t> NewFlags;
};
struct CopyConfig {
StringRef OutputFilename;
StringRef InputFilename;
StringRef OutputFormat;
StringRef InputFormat;
StringRef BinaryArch;
StringRef SplitDWO;
StringRef AddGnuDebugLink;
std::vector<StringRef> ToRemove;
std::vector<StringRef> Keep;
std::vector<StringRef> OnlyKeep;
std::vector<StringRef> AddSection;
std::vector<StringRef> SymbolsToLocalize;
std::vector<StringRef> SymbolsToGlobalize;
std::vector<StringRef> SymbolsToWeaken;
std::vector<StringRef> SymbolsToRemove;
std::vector<StringRef> SymbolsToKeep;
StringMap<SectionRename> SectionsToRename;
StringMap<StringRef> SymbolsToRename;
bool StripAll = false;
bool StripAllGNU = false;
bool StripDebug = false;
bool StripSections = false;
bool StripNonAlloc = false;
bool StripDWO = false;
bool StripUnneeded = false;
bool ExtractDWO = false;
bool LocalizeHidden = false;
bool Weaken = false;
bool DiscardAll = false;
bool OnlyKeepDebug = false;
bool KeepFileSymbols = false;
};
using SectionPred = std::function<bool(const SectionBase &Sec)>;
enum SectionFlag {
SecNone = 0,
SecAlloc = 1 << 0,
SecLoad = 1 << 1,
SecNoload = 1 << 2,
SecReadonly = 1 << 3,
SecDebug = 1 << 4,
SecCode = 1 << 5,
SecData = 1 << 6,
SecRom = 1 << 7,
SecMerge = 1 << 8,
SecStrings = 1 << 9,
SecContents = 1 << 10,
SecShare = 1 << 11,
LLVM_MARK_AS_BITMASK_ENUM(/* LargestValue = */ SecShare)
};
} // namespace
namespace llvm {
namespace objcopy {
// The name this program was invoked as.
StringRef ToolName;
LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
errs() << ToolName << ": " << Message << ".\n";
errs().flush();
exit(1);
}
LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, std::error_code EC) {
assert(EC);
errs() << ToolName << ": '" << File << "': " << EC.message() << ".\n";
exit(1);
}
LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, Error E) {
assert(E);
std::string Buf;
raw_string_ostream OS(Buf);
logAllUnhandledErrors(std::move(E), OS, "");
OS.flush();
errs() << ToolName << ": '" << File << "': " << Buf;
exit(1);
}
} // end namespace objcopy
} // end namespace llvm
static SectionFlag ParseSectionRenameFlag(StringRef SectionName) {
return llvm::StringSwitch<SectionFlag>(SectionName)
.Case("alloc", SectionFlag::SecAlloc)
.Case("load", SectionFlag::SecLoad)
.Case("noload", SectionFlag::SecNoload)
.Case("readonly", SectionFlag::SecReadonly)
.Case("debug", SectionFlag::SecDebug)
.Case("code", SectionFlag::SecCode)
.Case("data", SectionFlag::SecData)
.Case("rom", SectionFlag::SecRom)
.Case("merge", SectionFlag::SecMerge)
.Case("strings", SectionFlag::SecStrings)
.Case("contents", SectionFlag::SecContents)
.Case("share", SectionFlag::SecShare)
.Default(SectionFlag::SecNone);
}
static SectionRename ParseRenameSectionValue(StringRef FlagValue) {
if (!FlagValue.contains('='))
error("Bad format for --rename-section: missing '='");
// Initial split: ".foo" = ".bar,f1,f2,..."
auto Old2New = FlagValue.split('=');
SectionRename SR;
SR.OriginalName = Old2New.first;
// Flags split: ".bar" "f1" "f2" ...
SmallVector<StringRef, 6> NameAndFlags;
Old2New.second.split(NameAndFlags, ',');
SR.NewName = NameAndFlags[0];
if (NameAndFlags.size() > 1) {
SectionFlag Flags = SectionFlag::SecNone;
for (size_t I = 1, Size = NameAndFlags.size(); I < Size; ++I) {
SectionFlag Flag = ParseSectionRenameFlag(NameAndFlags[I]);
if (Flag == SectionFlag::SecNone)
error("Unrecognized section flag '" + NameAndFlags[I] +
"'. Flags supported for GNU compatibility: alloc, load, noload, "
"readonly, debug, code, data, rom, share, contents, merge, "
"strings.");
Flags |= Flag;
}
SR.NewFlags = 0;
if (Flags & SectionFlag::SecAlloc)
*SR.NewFlags |= ELF::SHF_ALLOC;
if (!(Flags & SectionFlag::SecReadonly))
*SR.NewFlags |= ELF::SHF_WRITE;
if (Flags & SectionFlag::SecCode)
*SR.NewFlags |= ELF::SHF_EXECINSTR;
if (Flags & SectionFlag::SecMerge)
*SR.NewFlags |= ELF::SHF_MERGE;
if (Flags & SectionFlag::SecStrings)
*SR.NewFlags |= ELF::SHF_STRINGS;
}
return SR;
}
static bool IsDebugSection(const SectionBase &Sec) {
return Sec.Name.startswith(".debug") || Sec.Name.startswith(".zdebug") ||
Sec.Name == ".gdb_index";
}
static bool IsDWOSection(const SectionBase &Sec) {
return Sec.Name.endswith(".dwo");
}
static bool OnlyKeepDWOPred(const Object &Obj, const SectionBase &Sec) {
// We can't remove the section header string table.
if (&Sec == Obj.SectionNames)
return false;
// Short of keeping the string table we want to keep everything that is a DWO
// section and remove everything else.
return !IsDWOSection(Sec);
}
static std::unique_ptr<Writer> CreateWriter(const CopyConfig &Config,
Object &Obj, Buffer &Buf,
ElfType OutputElfType) {
if (Config.OutputFormat == "binary") {
return llvm::make_unique<BinaryWriter>(Obj, Buf);
}
// Depending on the initial ELFT and OutputFormat we need a different Writer.
switch (OutputElfType) {
case ELFT_ELF32LE:
return llvm::make_unique<ELFWriter<ELF32LE>>(Obj, Buf,
!Config.StripSections);
case ELFT_ELF64LE:
return llvm::make_unique<ELFWriter<ELF64LE>>(Obj, Buf,
!Config.StripSections);
case ELFT_ELF32BE:
return llvm::make_unique<ELFWriter<ELF32BE>>(Obj, Buf,
!Config.StripSections);
case ELFT_ELF64BE:
return llvm::make_unique<ELFWriter<ELF64BE>>(Obj, Buf,
!Config.StripSections);
}
llvm_unreachable("Invalid output format");
}
static void SplitDWOToFile(const CopyConfig &Config, const Reader &Reader,
StringRef File, ElfType OutputElfType) {
auto DWOFile = Reader.create();
DWOFile->removeSections(
[&](const SectionBase &Sec) { return OnlyKeepDWOPred(*DWOFile, Sec); });
FileBuffer FB(File);
auto Writer = CreateWriter(Config, *DWOFile, FB, OutputElfType);
Writer->finalize();
Writer->write();
}
// This function handles the high level operations of GNU objcopy including
// handling command line options. It's important to outline certain properties
// we expect to hold of the command line operations. Any operation that "keeps"
// should keep regardless of a remove. Additionally any removal should respect
// any previous removals. Lastly whether or not something is removed shouldn't
// depend a) on the order the options occur in or b) on some opaque priority
// system. The only priority is that keeps/copies overrule removes.
static void HandleArgs(const CopyConfig &Config, Object &Obj,
const Reader &Reader, ElfType OutputElfType) {
if (!Config.SplitDWO.empty()) {
SplitDWOToFile(Config, Reader, Config.SplitDWO, OutputElfType);
}
// TODO: update or remove symbols only if there is an option that affects
// them.
if (Obj.SymbolTable) {
Obj.SymbolTable->updateSymbols([&](Symbol &Sym) {
if ((Config.LocalizeHidden &&
(Sym.Visibility == STV_HIDDEN || Sym.Visibility == STV_INTERNAL)) ||
(!Config.SymbolsToLocalize.empty() &&
is_contained(Config.SymbolsToLocalize, Sym.Name)))
Sym.Binding = STB_LOCAL;
if (!Config.SymbolsToGlobalize.empty() &&
is_contained(Config.SymbolsToGlobalize, Sym.Name))
Sym.Binding = STB_GLOBAL;
if (!Config.SymbolsToWeaken.empty() &&
is_contained(Config.SymbolsToWeaken, Sym.Name) &&
Sym.Binding == STB_GLOBAL)
Sym.Binding = STB_WEAK;
if (Config.Weaken && Sym.Binding == STB_GLOBAL &&
Sym.getShndx() != SHN_UNDEF)
Sym.Binding = STB_WEAK;
const auto I = Config.SymbolsToRename.find(Sym.Name);
if (I != Config.SymbolsToRename.end())
Sym.Name = I->getValue();
});
// The purpose of this loop is to mark symbols referenced by sections
// (like GroupSection or RelocationSection). This way, we know which
// symbols are still 'needed' and wich are not.
if (Config.StripUnneeded) {
for (auto &Section : Obj.sections())
Section.markSymbols();
}
Obj.removeSymbols([&](const Symbol &Sym) {
if ((!Config.SymbolsToKeep.empty() &&
is_contained(Config.SymbolsToKeep, Sym.Name)) ||
(Config.KeepFileSymbols && Sym.Type == STT_FILE))
return false;
if (Config.DiscardAll && Sym.Binding == STB_LOCAL &&
Sym.getShndx() != SHN_UNDEF && Sym.Type != STT_FILE &&
Sym.Type != STT_SECTION)
return true;
if (Config.StripAll || Config.StripAllGNU)
return true;
if (!Config.SymbolsToRemove.empty() &&
is_contained(Config.SymbolsToRemove, Sym.Name)) {
return true;
}
if (Config.StripUnneeded && !Sym.Referenced &&
(Sym.Binding == STB_LOCAL || Sym.getShndx() == SHN_UNDEF) &&
Sym.Type != STT_FILE && Sym.Type != STT_SECTION)
return true;
return false;
});
}
SectionPred RemovePred = [](const SectionBase &) { return false; };
// Removes:
if (!Config.ToRemove.empty()) {
RemovePred = [&Config](const SectionBase &Sec) {
return find(Config.ToRemove, Sec.Name) != Config.ToRemove.end();
};
}
if (Config.StripDWO || !Config.SplitDWO.empty())
RemovePred = [RemovePred](const SectionBase &Sec) {
return IsDWOSection(Sec) || RemovePred(Sec);
};
if (Config.ExtractDWO)
RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
return OnlyKeepDWOPred(Obj, Sec) || RemovePred(Sec);
};
if (Config.StripAllGNU)
RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
if (RemovePred(Sec))
return true;
if ((Sec.Flags & SHF_ALLOC) != 0)
return false;
if (&Sec == Obj.SectionNames)
return false;
switch (Sec.Type) {
case SHT_SYMTAB:
case SHT_REL:
case SHT_RELA:
case SHT_STRTAB:
return true;
}
return IsDebugSection(Sec);
};
if (Config.StripSections) {
RemovePred = [RemovePred](const SectionBase &Sec) {
return RemovePred(Sec) || (Sec.Flags & SHF_ALLOC) == 0;
};
}
if (Config.StripDebug) {
RemovePred = [RemovePred](const SectionBase &Sec) {
return RemovePred(Sec) || IsDebugSection(Sec);
};
}
if (Config.StripNonAlloc)
RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
if (RemovePred(Sec))
return true;
if (&Sec == Obj.SectionNames)
return false;
return (Sec.Flags & SHF_ALLOC) == 0;
};
if (Config.StripAll)
RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
if (RemovePred(Sec))
return true;
if (&Sec == Obj.SectionNames)
return false;
if (Sec.Name.startswith(".gnu.warning"))
return false;
return (Sec.Flags & SHF_ALLOC) == 0;
};
// Explicit copies:
if (!Config.OnlyKeep.empty()) {
RemovePred = [&Config, RemovePred, &Obj](const SectionBase &Sec) {
// Explicitly keep these sections regardless of previous removes.
if (find(Config.OnlyKeep, Sec.Name) != Config.OnlyKeep.end())
return false;
// Allow all implicit removes.
if (RemovePred(Sec))
return true;
// Keep special sections.
if (Obj.SectionNames == &Sec)
return false;
if (Obj.SymbolTable == &Sec ||
(Obj.SymbolTable && Obj.SymbolTable->getStrTab() == &Sec))
return false;
// Remove everything else.
return true;
};
}
if (!Config.Keep.empty()) {
RemovePred = [Config, RemovePred](const SectionBase &Sec) {
// Explicitly keep these sections regardless of previous removes.
if (find(Config.Keep, Sec.Name) != Config.Keep.end())
return false;
// Otherwise defer to RemovePred.
return RemovePred(Sec);
};
}
// This has to be the last predicate assignment.
// If the option --keep-symbol has been specified
// and at least one of those symbols is present
// (equivalently, the updated symbol table is not empty)
// the symbol table and the string table should not be removed.
if ((!Config.SymbolsToKeep.empty() || Config.KeepFileSymbols) &&
Obj.SymbolTable && !Obj.SymbolTable->empty()) {
RemovePred = [&Obj, RemovePred](const SectionBase &Sec) {
if (&Sec == Obj.SymbolTable || &Sec == Obj.SymbolTable->getStrTab())
return false;
return RemovePred(Sec);
};
}
Obj.removeSections(RemovePred);
if (!Config.SectionsToRename.empty()) {
for (auto &Sec : Obj.sections()) {
const auto Iter = Config.SectionsToRename.find(Sec.Name);
if (Iter != Config.SectionsToRename.end()) {
const SectionRename &SR = Iter->second;
Sec.Name = SR.NewName;
if (SR.NewFlags.hasValue()) {
// Preserve some flags which should not be dropped when setting flags.
// Also, preserve anything OS/processor dependant.
const uint64_t PreserveMask = ELF::SHF_COMPRESSED | ELF::SHF_EXCLUDE |
ELF::SHF_GROUP | ELF::SHF_LINK_ORDER |
ELF::SHF_MASKOS | ELF::SHF_MASKPROC |
ELF::SHF_TLS | ELF::SHF_INFO_LINK;
Sec.Flags = (Sec.Flags & PreserveMask) |
(SR.NewFlags.getValue() & ~PreserveMask);
}
}
}
}
if (!Config.AddSection.empty()) {
for (const auto &Flag : Config.AddSection) {
auto SecPair = Flag.split("=");
auto SecName = SecPair.first;
auto File = SecPair.second;
auto BufOrErr = MemoryBuffer::getFile(File);
if (!BufOrErr)
reportError(File, BufOrErr.getError());
auto Buf = std::move(*BufOrErr);
auto BufPtr = reinterpret_cast<const uint8_t *>(Buf->getBufferStart());
auto BufSize = Buf->getBufferSize();
Obj.addSection<OwnedDataSection>(SecName,
ArrayRef<uint8_t>(BufPtr, BufSize));
}
}
if (!Config.AddGnuDebugLink.empty())
Obj.addSection<GnuDebugLinkSection>(Config.AddGnuDebugLink);
}
static void ExecuteElfObjcopyOnBinary(const CopyConfig &Config, Binary &Binary,
Buffer &Out) {
ELFReader Reader(&Binary);
std::unique_ptr<Object> Obj = Reader.create();
HandleArgs(Config, *Obj, Reader, Reader.getElfType());
std::unique_ptr<Writer> Writer =
CreateWriter(Config, *Obj, Out, Reader.getElfType());
Writer->finalize();
Writer->write();
}
// For regular archives this function simply calls llvm::writeArchive,
// For thin archives it writes the archive file itself as well as its members.
static Error deepWriteArchive(StringRef ArcName,
ArrayRef<NewArchiveMember> NewMembers,
bool WriteSymtab, object::Archive::Kind Kind,
bool Deterministic, bool Thin) {
Error E =
writeArchive(ArcName, NewMembers, WriteSymtab, Kind, Deterministic, Thin);
if (!Thin || E)
return E;
for (const NewArchiveMember &Member : NewMembers) {
// Internally, FileBuffer will use the buffer created by
// FileOutputBuffer::create, for regular files (that is the case for
// deepWriteArchive) FileOutputBuffer::create will return OnDiskBuffer.
// OnDiskBuffer uses a temporary file and then renames it. So in reality
// there is no inefficiency / duplicated in-memory buffers in this case. For
// now in-memory buffers can not be completely avoided since
// NewArchiveMember still requires them even though writeArchive does not
// write them on disk.
FileBuffer FB(Member.MemberName);
FB.allocate(Member.Buf->getBufferSize());
std::copy(Member.Buf->getBufferStart(), Member.Buf->getBufferEnd(),
FB.getBufferStart());
if (auto E = FB.commit())
return E;
}
return Error::success();
}
static void ExecuteElfObjcopyOnArchive(const CopyConfig &Config, const Archive &Ar) {
std::vector<NewArchiveMember> NewArchiveMembers;
Error Err = Error::success();
for (const Archive::Child &Child : Ar.children(Err)) {
Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
if (!ChildOrErr)
reportError(Ar.getFileName(), ChildOrErr.takeError());
Expected<StringRef> ChildNameOrErr = Child.getName();
if (!ChildNameOrErr)
reportError(Ar.getFileName(), ChildNameOrErr.takeError());
MemBuffer MB(ChildNameOrErr.get());
ExecuteElfObjcopyOnBinary(Config, **ChildOrErr, MB);
Expected<NewArchiveMember> Member =
NewArchiveMember::getOldMember(Child, true);
if (!Member)
reportError(Ar.getFileName(), Member.takeError());
Member->Buf = MB.releaseMemoryBuffer();
Member->MemberName = Member->Buf->getBufferIdentifier();
NewArchiveMembers.push_back(std::move(*Member));
}
if (Err)
reportError(Config.InputFilename, std::move(Err));
if (Error E =
deepWriteArchive(Config.OutputFilename, NewArchiveMembers,
Ar.hasSymbolTable(), Ar.kind(), true, Ar.isThin()))
reportError(Config.OutputFilename, std::move(E));
}
static void ExecuteElfObjcopy(const CopyConfig &Config) {
Expected<OwningBinary<llvm::object::Binary>> BinaryOrErr =
createBinary(Config.InputFilename);
if (!BinaryOrErr)
reportError(Config.InputFilename, BinaryOrErr.takeError());
if (Archive *Ar = dyn_cast<Archive>(BinaryOrErr.get().getBinary()))
return ExecuteElfObjcopyOnArchive(Config, *Ar);
FileBuffer FB(Config.OutputFilename);
ExecuteElfObjcopyOnBinary(Config, *BinaryOrErr.get().getBinary(), FB);
}
// ParseObjcopyOptions returns the config and sets the input arguments. If a
// help flag is set then ParseObjcopyOptions will print the help messege and
// exit.
static CopyConfig ParseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
ObjcopyOptTable T;
unsigned MissingArgumentIndex, MissingArgumentCount;
llvm::opt::InputArgList InputArgs =
T.ParseArgs(ArgsArr, MissingArgumentIndex, MissingArgumentCount);
if (InputArgs.size() == 0) {
T.PrintHelp(errs(), "llvm-objcopy <input> [ <output> ]", "objcopy tool");
exit(1);
}
if (InputArgs.hasArg(OBJCOPY_help)) {
T.PrintHelp(outs(), "llvm-objcopy <input> [ <output> ]", "objcopy tool");
exit(0);
}
SmallVector<const char *, 2> Positional;
for (auto Arg : InputArgs.filtered(OBJCOPY_UNKNOWN))
error("unknown argument '" + Arg->getAsString(InputArgs) + "'");
for (auto Arg : InputArgs.filtered(OBJCOPY_INPUT))
Positional.push_back(Arg->getValue());
if (Positional.empty())
error("No input file specified");
if (Positional.size() > 2)
error("Too many positional arguments");
CopyConfig Config;
Config.InputFilename = Positional[0];
Config.OutputFilename = Positional[Positional.size() == 1 ? 0 : 1];
Config.InputFormat = InputArgs.getLastArgValue(OBJCOPY_input_target);
Config.OutputFormat = InputArgs.getLastArgValue(OBJCOPY_output_target);
Config.BinaryArch = InputArgs.getLastArgValue(OBJCOPY_binary_architecture);
Config.SplitDWO = InputArgs.getLastArgValue(OBJCOPY_split_dwo);
Config.AddGnuDebugLink = InputArgs.getLastArgValue(OBJCOPY_add_gnu_debuglink);
for (auto Arg : InputArgs.filtered(OBJCOPY_redefine_symbol)) {
if (!StringRef(Arg->getValue()).contains('='))
error("Bad format for --redefine-sym");
auto Old2New = StringRef(Arg->getValue()).split('=');
if (!Config.SymbolsToRename.insert(Old2New).second)
error("Multiple redefinition of symbol " + Old2New.first);
}
for (auto Arg : InputArgs.filtered(OBJCOPY_rename_section)) {
SectionRename SR = ParseRenameSectionValue(StringRef(Arg->getValue()));
if (!Config.SectionsToRename.try_emplace(SR.OriginalName, SR).second)
error("Multiple renames of section " + SR.OriginalName);
}
for (auto Arg : InputArgs.filtered(OBJCOPY_remove_section))
Config.ToRemove.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_keep))
Config.Keep.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_only_keep))
Config.OnlyKeep.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_add_section))
Config.AddSection.push_back(Arg->getValue());
Config.StripAll = InputArgs.hasArg(OBJCOPY_strip_all);
Config.StripAllGNU = InputArgs.hasArg(OBJCOPY_strip_all_gnu);
Config.StripDebug = InputArgs.hasArg(OBJCOPY_strip_debug);
Config.StripDWO = InputArgs.hasArg(OBJCOPY_strip_dwo);
Config.StripSections = InputArgs.hasArg(OBJCOPY_strip_sections);
Config.StripNonAlloc = InputArgs.hasArg(OBJCOPY_strip_non_alloc);
Config.StripUnneeded = InputArgs.hasArg(OBJCOPY_strip_unneeded);
Config.ExtractDWO = InputArgs.hasArg(OBJCOPY_extract_dwo);
Config.LocalizeHidden = InputArgs.hasArg(OBJCOPY_localize_hidden);
Config.Weaken = InputArgs.hasArg(OBJCOPY_weaken);
Config.DiscardAll = InputArgs.hasArg(OBJCOPY_discard_all);
Config.OnlyKeepDebug = InputArgs.hasArg(OBJCOPY_only_keep_debug);
Config.KeepFileSymbols = InputArgs.hasArg(OBJCOPY_keep_file_symbols);
for (auto Arg : InputArgs.filtered(OBJCOPY_localize_symbol))
Config.SymbolsToLocalize.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_globalize_symbol))
Config.SymbolsToGlobalize.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_weaken_symbol))
Config.SymbolsToWeaken.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_strip_symbol))
Config.SymbolsToRemove.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_keep_symbol))
Config.SymbolsToKeep.push_back(Arg->getValue());
return Config;
}
// ParseStripOptions returns the config and sets the input arguments. If a
// help flag is set then ParseStripOptions will print the help messege and
// exit.
static CopyConfig ParseStripOptions(ArrayRef<const char *> ArgsArr) {
StripOptTable T;
unsigned MissingArgumentIndex, MissingArgumentCount;
llvm::opt::InputArgList InputArgs =
T.ParseArgs(ArgsArr, MissingArgumentIndex, MissingArgumentCount);
if (InputArgs.size() == 0) {
T.PrintHelp(errs(), "llvm-strip <input> [ <output> ]", "strip tool");
exit(1);
}
if (InputArgs.hasArg(STRIP_help)) {
T.PrintHelp(outs(), "llvm-strip <input> [ <output> ]", "strip tool");
exit(0);
}
SmallVector<const char *, 2> Positional;
for (auto Arg : InputArgs.filtered(STRIP_UNKNOWN))
error("unknown argument '" + Arg->getAsString(InputArgs) + "'");
for (auto Arg : InputArgs.filtered(STRIP_INPUT))
Positional.push_back(Arg->getValue());
if (Positional.empty())
error("No input file specified");
if (Positional.size() > 2)
error("Support for multiple input files is not implemented yet");
CopyConfig Config;
Config.InputFilename = Positional[0];
Config.OutputFilename =
InputArgs.getLastArgValue(STRIP_output, Positional[0]);
Config.StripDebug = InputArgs.hasArg(STRIP_strip_debug);
Config.DiscardAll = InputArgs.hasArg(STRIP_discard_all);
Config.StripUnneeded = InputArgs.hasArg(STRIP_strip_unneeded);
Config.StripAll = InputArgs.hasArg(STRIP_strip_all);
if (!Config.StripDebug && !Config.StripUnneeded && !Config.DiscardAll)
Config.StripAll = true;
for (auto Arg : InputArgs.filtered(STRIP_remove_section))
Config.ToRemove.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(STRIP_keep_symbol))
Config.SymbolsToKeep.push_back(Arg->getValue());
return Config;
}
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
ToolName = argv[0];
CopyConfig Config;
if (sys::path::stem(ToolName).endswith_lower("strip"))
Config = ParseStripOptions(makeArrayRef(argv + 1, argc));
else
Config = ParseObjcopyOptions(makeArrayRef(argv + 1, argc));
ExecuteElfObjcopy(Config);
}
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