tools/llvm-objcopy/MachO/MachOObjcopy.cpp

   1 //===- MachOObjcopy.cpp -----------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "MachOObjcopy.h"
  10 #include "../CopyConfig.h"
  11 #include "MachOReader.h"
  12 #include "MachOWriter.h"
  13 #include "llvm/Support/Errc.h"
  14 #include "llvm/Support/Error.h"
  15
  16 namespace llvm {
  17 namespace objcopy {
  18 namespace macho {
  19
  20 using namespace object;
  21
  22 static Error handleArgs(const CopyConfig &Config, Object &Obj) {
  23   if (Config.AllowBrokenLinks || !Config.BuildIdLinkDir.empty() ||
  24       Config.BuildIdLinkInput || Config.BuildIdLinkOutput ||
  25       !Config.SplitDWO.empty() || !Config.SymbolsPrefix.empty() ||
  26       !Config.AllocSectionsPrefix.empty() || !Config.AddSection.empty() ||
  27       !Config.DumpSection.empty() || !Config.KeepSection.empty() ||
  28       Config.NewSymbolVisibility || !Config.OnlySection.empty() ||
  29       !Config.SymbolsToGlobalize.empty() || !Config.SymbolsToKeep.empty() ||
  30       !Config.SymbolsToLocalize.empty() || !Config.SymbolsToWeaken.empty() ||
  31       !Config.SymbolsToKeepGlobal.empty() || !Config.SectionsToRename.empty() ||
  32       !Config.SymbolsToRename.empty() ||
  33       !Config.UnneededSymbolsToRemove.empty() ||
  34       !Config.SetSectionFlags.empty() || !Config.ToRemove.empty() ||
  35       Config.ExtractDWO || Config.KeepFileSymbols || Config.LocalizeHidden ||
  36       Config.PreserveDates || Config.StripDWO || Config.StripNonAlloc ||
  37       Config.StripSections || Config.Weaken || Config.DecompressDebugSections ||
  38       Config.StripDebug || Config.StripNonAlloc || Config.StripSections ||
  39       Config.StripUnneeded || Config.DiscardMode != DiscardType::None ||
  40       !Config.SymbolsToAdd.empty() || Config.EntryExpr) {
  41     return createStringError(llvm::errc::invalid_argument,
  42                              "option not supported by llvm-objcopy for MachO");
  43   }
  44
  45   return Error::success();
  46 }
  47
  48 Error executeObjcopyOnBinary(const CopyConfig &Config,
  49                              object::MachOObjectFile &In, Buffer &Out) {
  50   MachOReader Reader(In);
  51   std::unique_ptr<Object> O = Reader.create();
  52   if (!O)
  53     return createFileError(
  54         Config.InputFilename,
  55         createStringError(object_error::parse_failed,
  56                           "unable to deserialize MachO object"));
  57
  58   if (Error E = handleArgs(Config, *O))
  59     return createFileError(Config.InputFilename, std::move(E));
  60
  61   // TODO: Support 16KB pages which are employed in iOS arm64 binaries:
  62   //       https://github.com/llvm/llvm-project/commit/1bebb2832ee312d3b0316dacff457a7a29435edb
  63   const uint64_t PageSize = 4096;
  64
  65   MachOWriter Writer(*O, In.is64Bit(), In.isLittleEndian(), PageSize, Out);
  66   if (auto E = Writer.finalize())
  67     return E;
  68   return Writer.write();
  69 }
  70
  71 } // end namespace macho
  72 } // end namespace objcopy
  73 } // end namespace llvm