arm/usr/include/llvm/Object/Archive.h - manifest_repos/toolchain - Git at Google

 //===- Archive.h - ar archive file format -----------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the ar archive file format class.
 //
 //===----------------------------------------------------------------------===//

 #ifndef LLVM_OBJECT_ARCHIVE_H
 #define LLVM_OBJECT_ARCHIVE_H

 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/fallible_iterator.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/Object/Binary.h"
 #include "llvm/Support/Chrono.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include <cassert>
 #include <cstdint>
 #include <memory>
 #include <string>
 #include <vector>

 namespace llvm {

 template <typename T> class Optional;

 namespace object {

 const char ArchiveMagic[] = "!<arch>\n";
 const char ThinArchiveMagic[] = "!<thin>\n";
 const char BigArchiveMagic[] = "<bigaf>\n";

 class Archive;

 class AbstractArchiveMemberHeader {
 protected:
   AbstractArchiveMemberHeader(const Archive *Parent) : Parent(Parent){};

 public:
   friend class Archive;
   virtual std::unique_ptr<AbstractArchiveMemberHeader> clone() const = 0;
   virtual ~AbstractArchiveMemberHeader() = default;

   /// Get the name without looking up long names.
   virtual Expected<StringRef> getRawName() const = 0;
   virtual StringRef getRawAccessMode() const = 0;
   virtual StringRef getRawLastModified() const = 0;
   virtual StringRef getRawUID() const = 0;
   virtual StringRef getRawGID() const = 0;

   /// Get the name looking up long names.
   virtual Expected<StringRef> getName(uint64_t Size) const = 0;
   virtual Expected<uint64_t> getSize() const = 0;
   virtual uint64_t getOffset() const = 0;

   /// Get next file member location.
   virtual Expected<const char *> getNextChildLoc() const = 0;
   virtual Expected<bool> isThin() const = 0;

   Expected<sys::fs::perms> getAccessMode() const;
   Expected<sys::TimePoint<std::chrono::seconds>> getLastModified() const;
   Expected<unsigned> getUID() const;
   Expected<unsigned> getGID() const;

   /// Returns the size in bytes of the format-defined member header of the
   /// concrete archive type.
   virtual uint64_t getSizeOf() const = 0;

   const Archive *Parent;
 };

 template <typename T>
 class CommonArchiveMemberHeader : public AbstractArchiveMemberHeader {
 public:
   CommonArchiveMemberHeader(const Archive *Parent, const T *RawHeaderPtr)
       : AbstractArchiveMemberHeader(Parent), ArMemHdr(RawHeaderPtr){};
   StringRef getRawAccessMode() const override;
   StringRef getRawLastModified() const override;
   StringRef getRawUID() const override;
   StringRef getRawGID() const override;

   uint64_t getOffset() const override;
   uint64_t getSizeOf() const override { return sizeof(T); }

   T const *ArMemHdr;
 };

 struct UnixArMemHdrType {
   char Name[16];
   char LastModified[12];
   char UID[6];
   char GID[6];
   char AccessMode[8];
   char Size[10]; ///< Size of data, not including header or padding.
   char Terminator[2];
 };

 class ArchiveMemberHeader : public CommonArchiveMemberHeader<UnixArMemHdrType> {
 public:
   ArchiveMemberHeader(const Archive *Parent, const char *RawHeaderPtr,
                       uint64_t Size, Error *Err);

   std::unique_ptr<AbstractArchiveMemberHeader> clone() const override {
     return std::make_unique<ArchiveMemberHeader>(*this);
   }

   Expected<StringRef> getRawName() const override;

   Expected<StringRef> getName(uint64_t Size) const override;
   Expected<uint64_t> getSize() const override;
   Expected<const char *> getNextChildLoc() const override;
   Expected<bool> isThin() const override;
 };

 // File Member Header
 struct BigArMemHdrType {
   char Size[20];       // File member size in decimal
   char NextOffset[20]; // Next member offset in decimal
   char PrevOffset[20]; // Previous member offset in decimal
   char LastModified[12];
   char UID[12];
   char GID[12];
   char AccessMode[12];
   char NameLen[4]; // File member name length in decimal
   union {
     char Name[2]; // Start of member name
     char Terminator[2];
   };
 };

 // Define file member header of AIX big archive.
 class BigArchiveMemberHeader
     : public CommonArchiveMemberHeader<BigArMemHdrType> {

 public:
   BigArchiveMemberHeader(Archive const *Parent, const char *RawHeaderPtr,
                          uint64_t Size, Error *Err);
   std::unique_ptr<AbstractArchiveMemberHeader> clone() const override {
     return std::make_unique<BigArchiveMemberHeader>(*this);
   }

   Expected<StringRef> getRawName() const override;
   Expected<uint64_t> getRawNameSize() const;

   Expected<StringRef> getName(uint64_t Size) const override;
   Expected<uint64_t> getSize() const override;
   Expected<const char *> getNextChildLoc() const override;
   Expected<uint64_t> getNextOffset() const;
   Expected<bool> isThin() const override { return false; }
 };

 class Archive : public Binary {
   virtual void anchor();

 public:
   class Child {
     friend Archive;
     friend AbstractArchiveMemberHeader;

     const Archive *Parent;
     std::unique_ptr<AbstractArchiveMemberHeader> Header;
     /// Includes header but not padding byte.
     StringRef Data;
     /// Offset from Data to the start of the file.
     uint16_t StartOfFile;

     Expected<bool> isThinMember() const;

   public:
     Child(const Archive *Parent, const char *Start, Error *Err);
     Child(const Archive *Parent, StringRef Data, uint16_t StartOfFile);

     Child(const Child &C)
         : Parent(C.Parent), Data(C.Data), StartOfFile(C.StartOfFile) {
       if (C.Header)
         Header = C.Header->clone();
     }

     Child(Child &&C) {
       Parent = std::move(C.Parent);
       Header = std::move(C.Header);
       Data = C.Data;
       StartOfFile = C.StartOfFile;
     }

     Child &operator=(Child &&C) noexcept {
       if (&C == this)
         return *this;

       Parent = std::move(C.Parent);
       Header = std::move(C.Header);
       Data = C.Data;
       StartOfFile = C.StartOfFile;

       return *this;
     }

     Child &operator=(const Child &C) {
       if (&C == this)
         return *this;

       Parent = C.Parent;
       if (C.Header)
         Header = C.Header->clone();
       Data = C.Data;
       StartOfFile = C.StartOfFile;

       return *this;
     }

     bool operator==(const Child &other) const {
       assert(!Parent || !other.Parent || Parent == other.Parent);
       return Data.begin() == other.Data.begin();
     }

     const Archive *getParent() const { return Parent; }
     Expected<Child> getNext() const;

     Expected<StringRef> getName() const;
     Expected<std::string> getFullName() const;
     Expected<StringRef> getRawName() const { return Header->getRawName(); }

     Expected<sys::TimePoint<std::chrono::seconds>> getLastModified() const {
       return Header->getLastModified();
     }

     StringRef getRawLastModified() const {
       return Header->getRawLastModified();
     }

     Expected<unsigned> getUID() const { return Header->getUID(); }
     Expected<unsigned> getGID() const { return Header->getGID(); }

     Expected<sys::fs::perms> getAccessMode() const {
       return Header->getAccessMode();
     }

     /// \return the size of the archive member without the header or padding.
     Expected<uint64_t> getSize() const;
     /// \return the size in the archive header for this member.
     Expected<uint64_t> getRawSize() const;

     Expected<StringRef> getBuffer() const;
     uint64_t getChildOffset() const;
     uint64_t getDataOffset() const { return getChildOffset() + StartOfFile; }

     Expected<MemoryBufferRef> getMemoryBufferRef() const;

     Expected<std::unique_ptr<Binary>>
     getAsBinary(LLVMContext *Context = nullptr) const;
   };

   class ChildFallibleIterator {
     Child C;

   public:
     ChildFallibleIterator() : C(Child(nullptr, nullptr, nullptr)) {}
     ChildFallibleIterator(const Child &C) : C(C) {}

     const Child *operator->() const { return &C; }
     const Child &operator*() const { return C; }

     bool operator==(const ChildFallibleIterator &other) const {
       // Ignore errors here: If an error occurred during increment then getNext
       // will have been set to child_end(), and the following comparison should
       // do the right thing.
       return C == other.C;
     }

     bool operator!=(const ChildFallibleIterator &other) const {
       return !(*this == other);
     }

     Error inc() {
       auto NextChild = C.getNext();
       if (!NextChild)
         return NextChild.takeError();
       C = std::move(*NextChild);
       return Error::success();
     }
   };

   using child_iterator = fallible_iterator<ChildFallibleIterator>;

   class Symbol {
     const Archive *Parent;
     uint32_t SymbolIndex;
     uint32_t StringIndex; // Extra index to the string.

   public:
     Symbol(const Archive *p, uint32_t symi, uint32_t stri)
         : Parent(p), SymbolIndex(symi), StringIndex(stri) {}

     bool operator==(const Symbol &other) const {
       return (Parent == other.Parent) && (SymbolIndex == other.SymbolIndex);
     }

     StringRef getName() const;
     Expected<Child> getMember() const;
     Symbol getNext() const;
   };

   class symbol_iterator {
     Symbol symbol;

   public:
     symbol_iterator(const Symbol &s) : symbol(s) {}

     const Symbol *operator->() const { return &symbol; }
     const Symbol &operator*() const { return symbol; }

     bool operator==(const symbol_iterator &other) const {
       return symbol == other.symbol;
     }

     bool operator!=(const symbol_iterator &other) const {
       return !(*this == other);
     }

     symbol_iterator &operator++() { // Preincrement
       symbol = symbol.getNext();
       return *this;
     }
   };

   Archive(MemoryBufferRef Source, Error &Err);
   static Expected<std::unique_ptr<Archive>> create(MemoryBufferRef Source);

   /// Size field is 10 decimal digits long
   static const uint64_t MaxMemberSize = 9999999999;

   enum Kind { K_GNU, K_GNU64, K_BSD, K_DARWIN, K_DARWIN64, K_COFF, K_AIXBIG };

   Kind kind() const { return (Kind)Format; }
   bool isThin() const { return IsThin; }
   static object::Archive::Kind getDefaultKindForHost();

   child_iterator child_begin(Error &Err, bool SkipInternal = true) const;
   child_iterator child_end() const;
   iterator_range<child_iterator> children(Error &Err,
                                           bool SkipInternal = true) const {
     return make_range(child_begin(Err, SkipInternal), child_end());
   }

   symbol_iterator symbol_begin() const;
   symbol_iterator symbol_end() const;
   iterator_range<symbol_iterator> symbols() const {
     return make_range(symbol_begin(), symbol_end());
   }

   static bool classof(Binary const *v) { return v->isArchive(); }

   // check if a symbol is in the archive
   Expected<Optional<Child>> findSym(StringRef name) const;

   virtual bool isEmpty() const;
   bool hasSymbolTable() const;
   StringRef getSymbolTable() const { return SymbolTable; }
   StringRef getStringTable() const { return StringTable; }
   uint32_t getNumberOfSymbols() const;
   virtual uint64_t getFirstChildOffset() const { return getArchiveMagicLen(); }

   std::vector<std::unique_ptr<MemoryBuffer>> takeThinBuffers() {
     return std::move(ThinBuffers);
   }

   std::unique_ptr<AbstractArchiveMemberHeader>
   createArchiveMemberHeader(const char *RawHeaderPtr, uint64_t Size,
                             Error *Err) const;

 protected:
   uint64_t getArchiveMagicLen() const;
   void setFirstRegular(const Child &C);

 private:
   StringRef SymbolTable;
   StringRef StringTable;

   StringRef FirstRegularData;
   uint16_t FirstRegularStartOfFile = -1;

   unsigned Format : 3;
   unsigned IsThin : 1;
   mutable std::vector<std::unique_ptr<MemoryBuffer>> ThinBuffers;
 };

 class BigArchive : public Archive {
 public:
   /// Fixed-Length Header.
   struct FixLenHdr {
     char Magic[sizeof(BigArchiveMagic) - 1]; ///< Big archive magic string.
     char MemOffset[20];                      ///< Offset to member table.
     char GlobSymOffset[20];                  ///< Offset to global symbol table.
     char
         GlobSym64Offset[20]; ///< Offset global symbol table for 64-bit objects.
     char FirstChildOffset[20]; ///< Offset to first archive member.
     char LastChildOffset[20];  ///< Offset to last archive member.
     char FreeOffset[20];       ///< Offset to first mem on free list.
   };

   const FixLenHdr *ArFixLenHdr;
   uint64_t FirstChildOffset = 0;
   uint64_t LastChildOffset = 0;

 public:
   BigArchive(MemoryBufferRef Source, Error &Err);
   uint64_t getFirstChildOffset() const override { return FirstChildOffset; }
   uint64_t getLastChildOffset() const { return LastChildOffset; }
   bool isEmpty() const override {
     return Data.getBufferSize() == sizeof(FixLenHdr);
   };
 };

 } // end namespace object
 } // end namespace llvm

 #endif // LLVM_OBJECT_ARCHIVE_H
	//===- Archive.h - ar archive file format ------------------------ 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
	//
	//===----------------------------------------------------------------------===//
	//
	// This file declares the ar archive file format class.
	//
	//===----------------------------------------------------------------------===//

	#ifndef LLVM_OBJECT_ARCHIVE_H
	#define LLVM_OBJECT_ARCHIVE_H

	#include "llvm/ADT/StringRef.h"
	#include "llvm/ADT/fallible_iterator.h"
	#include "llvm/ADT/iterator_range.h"
	#include "llvm/Object/Binary.h"
	#include "llvm/Support/Chrono.h"
	#include "llvm/Support/Error.h"
	#include "llvm/Support/FileSystem.h"
	#include "llvm/Support/MemoryBuffer.h"
	#include <cassert>
	#include <cstdint>
	#include <memory>
	#include <string>
	#include <vector>

	namespace llvm {

	template <typename T> class Optional;

	namespace object {

	const char ArchiveMagic[] = "!<arch>\n";
	const char ThinArchiveMagic[] = "!<thin>\n";
	const char BigArchiveMagic[] = "<bigaf>\n";

	class Archive;

	class AbstractArchiveMemberHeader {
	protected:
	AbstractArchiveMemberHeader(const Archive *Parent) : Parent(Parent){};

	public:
	friend class Archive;
	virtual std::unique_ptr<AbstractArchiveMemberHeader> clone() const = 0;
	virtual ~AbstractArchiveMemberHeader() = default;

	/// Get the name without looking up long names.
	virtual Expected<StringRef> getRawName() const = 0;
	virtual StringRef getRawAccessMode() const = 0;
	virtual StringRef getRawLastModified() const = 0;
	virtual StringRef getRawUID() const = 0;
	virtual StringRef getRawGID() const = 0;

	/// Get the name looking up long names.
	virtual Expected<StringRef> getName(uint64_t Size) const = 0;
	virtual Expected<uint64_t> getSize() const = 0;
	virtual uint64_t getOffset() const = 0;

	/// Get next file member location.
	virtual Expected<const char *> getNextChildLoc() const = 0;
	virtual Expected<bool> isThin() const = 0;

	Expected<sys::fs::perms> getAccessMode() const;
	Expected<sys::TimePoint<std::chrono::seconds>> getLastModified() const;
	Expected<unsigned> getUID() const;
	Expected<unsigned> getGID() const;

	/// Returns the size in bytes of the format-defined member header of the
	/// concrete archive type.
	virtual uint64_t getSizeOf() const = 0;

	const Archive *Parent;
	};

	template <typename T>
	class CommonArchiveMemberHeader : public AbstractArchiveMemberHeader {
	public:
	CommonArchiveMemberHeader(const Archive Parent, const T RawHeaderPtr)
	: AbstractArchiveMemberHeader(Parent), ArMemHdr(RawHeaderPtr){};
	StringRef getRawAccessMode() const override;
	StringRef getRawLastModified() const override;
	StringRef getRawUID() const override;
	StringRef getRawGID() const override;

	uint64_t getOffset() const override;
	uint64_t getSizeOf() const override { return sizeof(T); }

	T const *ArMemHdr;
	};

	struct UnixArMemHdrType {
	char Name[16];
	char LastModified[12];
	char UID[6];
	char GID[6];
	char AccessMode[8];
	char Size[10]; ///< Size of data, not including header or padding.
	char Terminator[2];
	};

	class ArchiveMemberHeader : public CommonArchiveMemberHeader<UnixArMemHdrType> {
	public:
	ArchiveMemberHeader(const Archive Parent, const char RawHeaderPtr,
	uint64_t Size, Error *Err);

	std::unique_ptr<AbstractArchiveMemberHeader> clone() const override {
	return std::make_unique<ArchiveMemberHeader>(*this);
	}

	Expected<StringRef> getRawName() const override;

	Expected<StringRef> getName(uint64_t Size) const override;
	Expected<uint64_t> getSize() const override;
	Expected<const char *> getNextChildLoc() const override;
	Expected<bool> isThin() const override;
	};

	// File Member Header
	struct BigArMemHdrType {
	char Size[20]; // File member size in decimal
	char NextOffset[20]; // Next member offset in decimal
	char PrevOffset[20]; // Previous member offset in decimal
	char LastModified[12];
	char UID[12];
	char GID[12];
	char AccessMode[12];
	char NameLen[4]; // File member name length in decimal
	union {
	char Name[2]; // Start of member name
	char Terminator[2];
	};
	};

	// Define file member header of AIX big archive.
	class BigArchiveMemberHeader
	: public CommonArchiveMemberHeader<BigArMemHdrType> {

	public:
	BigArchiveMemberHeader(Archive const Parent, const char RawHeaderPtr,
	uint64_t Size, Error *Err);
	std::unique_ptr<AbstractArchiveMemberHeader> clone() const override {
	return std::make_unique<BigArchiveMemberHeader>(*this);
	}

	Expected<StringRef> getRawName() const override;
	Expected<uint64_t> getRawNameSize() const;

	Expected<StringRef> getName(uint64_t Size) const override;
	Expected<uint64_t> getSize() const override;
	Expected<const char *> getNextChildLoc() const override;
	Expected<uint64_t> getNextOffset() const;
	Expected<bool> isThin() const override { return false; }
	};

	class Archive : public Binary {
	virtual void anchor();

	public:
	class Child {
	friend Archive;
	friend AbstractArchiveMemberHeader;

	const Archive *Parent;
	std::unique_ptr<AbstractArchiveMemberHeader> Header;
	/// Includes header but not padding byte.
	StringRef Data;
	/// Offset from Data to the start of the file.
	uint16_t StartOfFile;

	Expected<bool> isThinMember() const;

	public:
	Child(const Archive Parent, const char Start, Error *Err);
	Child(const Archive *Parent, StringRef Data, uint16_t StartOfFile);

	Child(const Child &C)
	: Parent(C.Parent), Data(C.Data), StartOfFile(C.StartOfFile) {
	if (C.Header)
	Header = C.Header->clone();
	}

	Child(Child &&C) {
	Parent = std::move(C.Parent);
	Header = std::move(C.Header);
	Data = C.Data;
	StartOfFile = C.StartOfFile;
	}

	Child &operator=(Child &&C) noexcept {
	if (&C == this)
	return *this;

	Parent = std::move(C.Parent);
	Header = std::move(C.Header);
	Data = C.Data;
	StartOfFile = C.StartOfFile;

	return *this;
	}

	Child &operator=(const Child &C) {
	if (&C == this)
	return *this;

	Parent = C.Parent;
	if (C.Header)
	Header = C.Header->clone();
	Data = C.Data;
	StartOfFile = C.StartOfFile;

	return *this;
	}

	bool operator==(const Child &other) const {
	assert(!Parent \|\| !other.Parent \|\| Parent == other.Parent);
	return Data.begin() == other.Data.begin();
	}

	const Archive *getParent() const { return Parent; }
	Expected<Child> getNext() const;

	Expected<StringRef> getName() const;
	Expected<std::string> getFullName() const;
	Expected<StringRef> getRawName() const { return Header->getRawName(); }

	Expected<sys::TimePoint<std::chrono::seconds>> getLastModified() const {
	return Header->getLastModified();
	}

	StringRef getRawLastModified() const {
	return Header->getRawLastModified();
	}

	Expected<unsigned> getUID() const { return Header->getUID(); }
	Expected<unsigned> getGID() const { return Header->getGID(); }

	Expected<sys::fs::perms> getAccessMode() const {
	return Header->getAccessMode();
	}

	/// \return the size of the archive member without the header or padding.
	Expected<uint64_t> getSize() const;
	/// \return the size in the archive header for this member.
	Expected<uint64_t> getRawSize() const;

	Expected<StringRef> getBuffer() const;
	uint64_t getChildOffset() const;
	uint64_t getDataOffset() const { return getChildOffset() + StartOfFile; }

	Expected<MemoryBufferRef> getMemoryBufferRef() const;

	Expected<std::unique_ptr<Binary>>
	getAsBinary(LLVMContext *Context = nullptr) const;
	};

	class ChildFallibleIterator {
	Child C;

	public:
	ChildFallibleIterator() : C(Child(nullptr, nullptr, nullptr)) {}
	ChildFallibleIterator(const Child &C) : C(C) {}

	const Child *operator->() const { return &C; }
	const Child &operator*() const { return C; }

	bool operator==(const ChildFallibleIterator &other) const {
	// Ignore errors here: If an error occurred during increment then getNext
	// will have been set to child_end(), and the following comparison should
	// do the right thing.
	return C == other.C;
	}

	bool operator!=(const ChildFallibleIterator &other) const {
	return !(*this == other);
	}

	Error inc() {
	auto NextChild = C.getNext();
	if (!NextChild)
	return NextChild.takeError();
	C = std::move(*NextChild);
	return Error::success();
	}
	};

	using child_iterator = fallible_iterator<ChildFallibleIterator>;

	class Symbol {
	const Archive *Parent;
	uint32_t SymbolIndex;
	uint32_t StringIndex; // Extra index to the string.

	public:
	Symbol(const Archive *p, uint32_t symi, uint32_t stri)
	: Parent(p), SymbolIndex(symi), StringIndex(stri) {}

	bool operator==(const Symbol &other) const {
	return (Parent == other.Parent) && (SymbolIndex == other.SymbolIndex);
	}

	StringRef getName() const;
	Expected<Child> getMember() const;
	Symbol getNext() const;
	};

	class symbol_iterator {
	Symbol symbol;

	public:
	symbol_iterator(const Symbol &s) : symbol(s) {}

	const Symbol *operator->() const { return &symbol; }
	const Symbol &operator*() const { return symbol; }

	bool operator==(const symbol_iterator &other) const {
	return symbol == other.symbol;
	}

	bool operator!=(const symbol_iterator &other) const {
	return !(*this == other);
	}

	symbol_iterator &operator++() { // Preincrement
	symbol = symbol.getNext();
	return *this;
	}
	};

	Archive(MemoryBufferRef Source, Error &Err);
	static Expected<std::unique_ptr<Archive>> create(MemoryBufferRef Source);

	/// Size field is 10 decimal digits long
	static const uint64_t MaxMemberSize = 9999999999;

	enum Kind { K_GNU, K_GNU64, K_BSD, K_DARWIN, K_DARWIN64, K_COFF, K_AIXBIG };

	Kind kind() const { return (Kind)Format; }
	bool isThin() const { return IsThin; }
	static object::Archive::Kind getDefaultKindForHost();

	child_iterator child_begin(Error &Err, bool SkipInternal = true) const;
	child_iterator child_end() const;
	iterator_range<child_iterator> children(Error &Err,
	bool SkipInternal = true) const {
	return make_range(child_begin(Err, SkipInternal), child_end());
	}

	symbol_iterator symbol_begin() const;
	symbol_iterator symbol_end() const;
	iterator_range<symbol_iterator> symbols() const {
	return make_range(symbol_begin(), symbol_end());
	}

	static bool classof(Binary const *v) { return v->isArchive(); }

	// check if a symbol is in the archive
	Expected<Optional<Child>> findSym(StringRef name) const;

	virtual bool isEmpty() const;
	bool hasSymbolTable() const;
	StringRef getSymbolTable() const { return SymbolTable; }
	StringRef getStringTable() const { return StringTable; }
	uint32_t getNumberOfSymbols() const;
	virtual uint64_t getFirstChildOffset() const { return getArchiveMagicLen(); }

	std::vector<std::unique_ptr<MemoryBuffer>> takeThinBuffers() {
	return std::move(ThinBuffers);
	}

	std::unique_ptr<AbstractArchiveMemberHeader>
	createArchiveMemberHeader(const char *RawHeaderPtr, uint64_t Size,
	Error *Err) const;

	protected:
	uint64_t getArchiveMagicLen() const;
	void setFirstRegular(const Child &C);

	private:
	StringRef SymbolTable;
	StringRef StringTable;

	StringRef FirstRegularData;
	uint16_t FirstRegularStartOfFile = -1;

	unsigned Format : 3;
	unsigned IsThin : 1;
	mutable std::vector<std::unique_ptr<MemoryBuffer>> ThinBuffers;
	};

	class BigArchive : public Archive {
	public:
	/// Fixed-Length Header.
	struct FixLenHdr {
	char Magic[sizeof(BigArchiveMagic) - 1]; ///< Big archive magic string.
	char MemOffset[20]; ///< Offset to member table.
	char GlobSymOffset[20]; ///< Offset to global symbol table.
	char
	GlobSym64Offset[20]; ///< Offset global symbol table for 64-bit objects.
	char FirstChildOffset[20]; ///< Offset to first archive member.
	char LastChildOffset[20]; ///< Offset to last archive member.
	char FreeOffset[20]; ///< Offset to first mem on free list.
	};

	const FixLenHdr *ArFixLenHdr;
	uint64_t FirstChildOffset = 0;
	uint64_t LastChildOffset = 0;

	public:
	BigArchive(MemoryBufferRef Source, Error &Err);
	uint64_t getFirstChildOffset() const override { return FirstChildOffset; }
	uint64_t getLastChildOffset() const { return LastChildOffset; }
	bool isEmpty() const override {
	return Data.getBufferSize() == sizeof(FixLenHdr);
	};
	};

	} // end namespace object
	} // end namespace llvm

	#endif // LLVM_OBJECT_ARCHIVE_H