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//===- Object.h -------------------------------------------------*- 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 
// 
//===----------------------------------------------------------------------===// 
 
#ifndef LLVM_TOOLS_OBJCOPY_COFF_OBJECT_H 
#define LLVM_TOOLS_OBJCOPY_COFF_OBJECT_H 
 
#include "llvm/ADT/ArrayRef.h" 
#include "llvm/ADT/DenseMap.h" 
#include "llvm/ADT/Optional.h" 
#include "llvm/ADT/StringRef.h" 
#include "llvm/ADT/iterator_range.h" 
#include "llvm/BinaryFormat/COFF.h" 
#include "llvm/Object/COFF.h" 
#include <cstddef> 
#include <cstdint> 
#include <vector> 
 
namespace llvm { 
namespace objcopy { 
namespace coff { 
 
struct Relocation { 
  Relocation() = default; 
  Relocation(const object::coff_relocation &R) : Reloc(R) {}
 
  object::coff_relocation Reloc; 
  size_t Target = 0; 
  StringRef TargetName; // Used for diagnostics only 
}; 
 
struct Section { 
  object::coff_section Header; 
  std::vector<Relocation> Relocs; 
  StringRef Name; 
  ssize_t UniqueId; 
  size_t Index; 
 
  ArrayRef<uint8_t> getContents() const { 
    if (!OwnedContents.empty()) 
      return OwnedContents; 
    return ContentsRef; 
  } 
 
  void setContentsRef(ArrayRef<uint8_t> Data) { 
    OwnedContents.clear(); 
    ContentsRef = Data; 
  } 
 
  void setOwnedContents(std::vector<uint8_t> &&Data) { 
    ContentsRef = ArrayRef<uint8_t>(); 
    OwnedContents = std::move(Data); 
  } 
 
  void clearContents() { 
    ContentsRef = ArrayRef<uint8_t>(); 
    OwnedContents.clear(); 
  } 
 
private: 
  ArrayRef<uint8_t> ContentsRef; 
  std::vector<uint8_t> OwnedContents; 
}; 
 
struct AuxSymbol { 
  AuxSymbol(ArrayRef<uint8_t> In) { 
    assert(In.size() == sizeof(Opaque)); 
    std::copy(In.begin(), In.end(), Opaque); 
  } 
 
  ArrayRef<uint8_t> getRef() const { 
    return ArrayRef<uint8_t>(Opaque, sizeof(Opaque)); 
  } 
 
  uint8_t Opaque[sizeof(object::coff_symbol16)]; 
}; 
 
struct Symbol { 
  object::coff_symbol32 Sym; 
  StringRef Name; 
  std::vector<AuxSymbol> AuxData; 
  StringRef AuxFile; 
  ssize_t TargetSectionId; 
  ssize_t AssociativeComdatTargetSectionId = 0; 
  Optional<size_t> WeakTargetSymbolId; 
  size_t UniqueId; 
  size_t RawIndex; 
  bool Referenced; 
}; 
 
struct Object { 
  bool IsPE = false; 
 
  object::dos_header DosHeader; 
  ArrayRef<uint8_t> DosStub; 
 
  object::coff_file_header CoffFileHeader; 
 
  bool Is64 = false; 
  object::pe32plus_header PeHeader; 
  uint32_t BaseOfData = 0; // pe32plus_header lacks this field. 
 
  std::vector<object::data_directory> DataDirectories; 
 
  ArrayRef<Symbol> getSymbols() const { return Symbols; } 
  // This allows mutating individual Symbols, but not mutating the list 
  // of symbols itself. 
  iterator_range<std::vector<Symbol>::iterator> getMutableSymbols() { 
    return make_range(Symbols.begin(), Symbols.end()); 
  } 
 
  const Symbol *findSymbol(size_t UniqueId) const; 
 
  void addSymbols(ArrayRef<Symbol> NewSymbols); 
  Error removeSymbols(function_ref<Expected<bool>(const Symbol &)> ToRemove);
 
  // Set the Referenced field on all Symbols, based on relocations in 
  // all sections. 
  Error markSymbols(); 
 
  ArrayRef<Section> getSections() const { return Sections; } 
  // This allows mutating individual Sections, but not mutating the list 
  // of sections itself. 
  iterator_range<std::vector<Section>::iterator> getMutableSections() { 
    return make_range(Sections.begin(), Sections.end()); 
  } 
 
  const Section *findSection(ssize_t UniqueId) const; 
 
  void addSections(ArrayRef<Section> NewSections); 
  void removeSections(function_ref<bool(const Section &)> ToRemove); 
  void truncateSections(function_ref<bool(const Section &)> ToTruncate); 
 
private: 
  std::vector<Symbol> Symbols; 
  DenseMap<size_t, Symbol *> SymbolMap; 
 
  size_t NextSymbolUniqueId = 0; 
 
  std::vector<Section> Sections; 
  DenseMap<ssize_t, Section *> SectionMap; 
 
  ssize_t NextSectionUniqueId = 1; // Allow a UniqueId 0 to mean undefined. 
 
  // Update SymbolMap. 
  void updateSymbols(); 
 
  // Update SectionMap and Index in each Section. 
  void updateSections(); 
}; 
 
// Copy between coff_symbol16 and coff_symbol32. 
// The source and destination files can use either coff_symbol16 or 
// coff_symbol32, while we always store them as coff_symbol32 in the 
// intermediate data structure. 
template <class Symbol1Ty, class Symbol2Ty> 
void copySymbol(Symbol1Ty &Dest, const Symbol2Ty &Src) { 
  static_assert(sizeof(Dest.Name.ShortName) == sizeof(Src.Name.ShortName), 
                "Mismatched name sizes"); 
  memcpy(Dest.Name.ShortName, Src.Name.ShortName, sizeof(Dest.Name.ShortName)); 
  Dest.Value = Src.Value; 
  Dest.SectionNumber = Src.SectionNumber; 
  Dest.Type = Src.Type; 
  Dest.StorageClass = Src.StorageClass; 
  Dest.NumberOfAuxSymbols = Src.NumberOfAuxSymbols; 
} 
 
// Copy between pe32_header and pe32plus_header. 
// We store the intermediate state in a pe32plus_header. 
template <class PeHeader1Ty, class PeHeader2Ty> 
void copyPeHeader(PeHeader1Ty &Dest, const PeHeader2Ty &Src) { 
  Dest.Magic = Src.Magic; 
  Dest.MajorLinkerVersion = Src.MajorLinkerVersion; 
  Dest.MinorLinkerVersion = Src.MinorLinkerVersion; 
  Dest.SizeOfCode = Src.SizeOfCode; 
  Dest.SizeOfInitializedData = Src.SizeOfInitializedData; 
  Dest.SizeOfUninitializedData = Src.SizeOfUninitializedData; 
  Dest.AddressOfEntryPoint = Src.AddressOfEntryPoint; 
  Dest.BaseOfCode = Src.BaseOfCode; 
  Dest.ImageBase = Src.ImageBase; 
  Dest.SectionAlignment = Src.SectionAlignment; 
  Dest.FileAlignment = Src.FileAlignment; 
  Dest.MajorOperatingSystemVersion = Src.MajorOperatingSystemVersion; 
  Dest.MinorOperatingSystemVersion = Src.MinorOperatingSystemVersion; 
  Dest.MajorImageVersion = Src.MajorImageVersion; 
  Dest.MinorImageVersion = Src.MinorImageVersion; 
  Dest.MajorSubsystemVersion = Src.MajorSubsystemVersion; 
  Dest.MinorSubsystemVersion = Src.MinorSubsystemVersion; 
  Dest.Win32VersionValue = Src.Win32VersionValue; 
  Dest.SizeOfImage = Src.SizeOfImage; 
  Dest.SizeOfHeaders = Src.SizeOfHeaders; 
  Dest.CheckSum = Src.CheckSum; 
  Dest.Subsystem = Src.Subsystem; 
  Dest.DLLCharacteristics = Src.DLLCharacteristics; 
  Dest.SizeOfStackReserve = Src.SizeOfStackReserve; 
  Dest.SizeOfStackCommit = Src.SizeOfStackCommit; 
  Dest.SizeOfHeapReserve = Src.SizeOfHeapReserve; 
  Dest.SizeOfHeapCommit = Src.SizeOfHeapCommit; 
  Dest.LoaderFlags = Src.LoaderFlags; 
  Dest.NumberOfRvaAndSize = Src.NumberOfRvaAndSize; 
} 
 
} // end namespace coff 
} // end namespace objcopy 
} // end namespace llvm 
 
#endif // LLVM_TOOLS_OBJCOPY_COFF_OBJECT_H