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| //===- MachOObjcopy.cpp -----------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "MachOObjcopy.h"
#include "../CopyConfig.h"
#include "MachOReader.h"
#include "MachOWriter.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/Error.h"
namespace llvm {
namespace objcopy {
namespace macho {
using namespace object;
using SectionPred = std::function<bool(const Section &Sec)>;
static void removeSections(const CopyConfig &Config, Object &Obj) {
SectionPred RemovePred = [](const Section &) { return false; };
if (!Config.OnlySection.empty()) {
RemovePred = [&Config, RemovePred](const Section &Sec) {
return !Config.OnlySection.matches(Sec.CanonicalName);
};
}
return Obj.removeSections(RemovePred);
}
static Error handleArgs(const CopyConfig &Config, Object &Obj) {
if (Config.AllowBrokenLinks || !Config.BuildIdLinkDir.empty() ||
Config.BuildIdLinkInput || Config.BuildIdLinkOutput ||
!Config.SplitDWO.empty() || !Config.SymbolsPrefix.empty() ||
!Config.AllocSectionsPrefix.empty() || !Config.AddSection.empty() ||
!Config.DumpSection.empty() || !Config.KeepSection.empty() ||
Config.NewSymbolVisibility || !Config.SymbolsToGlobalize.empty() ||
!Config.SymbolsToKeep.empty() || !Config.SymbolsToLocalize.empty() ||
!Config.SymbolsToWeaken.empty() || !Config.SymbolsToKeepGlobal.empty() ||
!Config.SectionsToRename.empty() || !Config.SymbolsToRename.empty() ||
!Config.UnneededSymbolsToRemove.empty() ||
!Config.SetSectionAlignment.empty() || !Config.SetSectionFlags.empty() ||
!Config.ToRemove.empty() || Config.ExtractDWO || Config.KeepFileSymbols ||
Config.LocalizeHidden || Config.PreserveDates || Config.StripDWO ||
Config.StripNonAlloc || Config.StripSections || Config.Weaken ||
Config.DecompressDebugSections || Config.StripDebug ||
Config.StripNonAlloc || Config.StripSections || Config.StripUnneeded ||
Config.DiscardMode != DiscardType::None || !Config.SymbolsToAdd.empty() ||
Config.EntryExpr) {
return createStringError(llvm::errc::invalid_argument,
"option not supported by llvm-objcopy for MachO");
}
removeSections(Config, Obj);
return Error::success();
}
Error executeObjcopyOnBinary(const CopyConfig &Config,
object::MachOObjectFile &In, Buffer &Out) {
MachOReader Reader(In);
std::unique_ptr<Object> O = Reader.create();
if (!O)
return createFileError(
Config.InputFilename,
createStringError(object_error::parse_failed,
"unable to deserialize MachO object"));
if (Error E = handleArgs(Config, *O))
return createFileError(Config.InputFilename, std::move(E));
// TODO: Support 16KB pages which are employed in iOS arm64 binaries:
// https://github.com/llvm/llvm-project/commit/1bebb2832ee312d3b0316dacff457a7a29435edb
const uint64_t PageSize = 4096;
MachOWriter Writer(*O, In.is64Bit(), In.isLittleEndian(), PageSize, Out);
if (auto E = Writer.finalize())
return E;
return Writer.write();
}
} // end namespace macho
} // end namespace objcopy
} // end namespace llvm
|