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Remove unused file. Thanks to Sean Silva for noticing it.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186239 91177308-0d34-0410-b5e6-96231b3b80d8
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Rafael Espindola 2013-07-13 04:24:33 +00:00
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tools/llvm-ar/Archive.h
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//===-- llvm/Bitcode/Archive.h - LLVM Bitcode Archive -----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header file declares the Archive and ArchiveMember classes that provide
// manipulation of LLVM Archive files. The implementation is provided by the
// lib/Bitcode/Archive library. This library is used to read and write
// archive (*.a) files that contain LLVM bitcode files (or others).
//
//===----------------------------------------------------------------------===//
#ifndef TOOLS_LLVM_AR_ARCHIVE_H
#define TOOLS_LLVM_AR_ARCHIVE_H
#include "llvm/ADT/ilist.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/TimeValue.h"
#include <map>
#include <set>
#include <vector>
namespace llvm {
class MemoryBuffer;
// Forward declare classes
class Module; // From VMCore
class Archive; // Declared below
class ArchiveMemberHeader; // Internal implementation class
class LLVMContext; // Global data
/// This class is the main class manipulated by users of the Archive class. It
/// holds information about one member of the Archive. It is also the element
/// stored by the Archive's ilist, the Archive's main abstraction. Because of
/// the special requirements of archive files, users are not permitted to
/// construct ArchiveMember instances. You should obtain them from the methods
/// of the Archive class instead.
/// @brief This class represents a single archive member.
class ArchiveMember : public ilist_node<ArchiveMember> {
/// @name Types
/// @{
public:
/// These flags are used internally by the archive member to specify various
/// characteristics of the member. The various "is" methods below provide
/// access to the flags. The flags are not user settable.
enum Flags {
SVR4SymbolTableFlag = 1, ///< Member is a SVR4 symbol table
BSD4SymbolTableFlag = 2, ///< Member is a BSD4 symbol table
HasLongFilenameFlag = 8, ///< Member uses the long filename syntax
StringTableFlag = 16 ///< Member is an ar(1) format string table
};
/// @}
/// @name Accessors
/// @{
public:
/// @returns the parent Archive instance
/// @brief Get the archive associated with this member
Archive* getArchive() const { return parent; }
/// @returns the path to the Archive's file
/// @brief Get the path to the archive member
StringRef getPath() const { return path; }
/// The "user" is the owner of the file per Unix security. This may not
/// have any applicability on non-Unix systems but is a required component
/// of the "ar" file format.
/// @brief Get the user associated with this archive member.
unsigned getUser() const { return User; }
/// The "group" is the owning group of the file per Unix security. This
/// may not have any applicability on non-Unix systems but is a required
/// component of the "ar" file format.
/// @brief Get the group associated with this archive member.
unsigned getGroup() const { return Group; }
/// The "mode" specifies the access permissions for the file per Unix
/// security. This may not have any applicability on non-Unix systems but is
/// a required component of the "ar" file format.
/// @brief Get the permission mode associated with this archive member.
unsigned getMode() const { return Mode; }
/// This method returns the time at which the archive member was last
/// modified when it was not in the archive.
/// @brief Get the time of last modification of the archive member.
sys::TimeValue getModTime() const { return ModTime; }
/// @returns the size of the archive member in bytes.
/// @brief Get the size of the archive member.
uint64_t getSize() const { return Size; }
/// This method returns the total size of the archive member as it
/// appears on disk. This includes the file content, the header, the
/// long file name if any, and the padding.
/// @brief Get total on-disk member size.
unsigned getMemberSize() const;
/// This method will return a pointer to the in-memory content of the
/// archive member, if it is available. If the data has not been loaded
/// into memory, the return value will be null.
/// @returns a pointer to the member's data.
/// @brief Get the data content of the archive member
const char* getData() const { return data; }
/// @returns true iff the member is a SVR4 (non-LLVM) symbol table
/// @brief Determine if this member is a SVR4 symbol table.
bool isSVR4SymbolTable() const { return flags&SVR4SymbolTableFlag; }
/// @returns true iff the member is a BSD4.4 (non-LLVM) symbol table
/// @brief Determine if this member is a BSD4.4 symbol table.
bool isBSD4SymbolTable() const { return flags&BSD4SymbolTableFlag; }
/// @returns true iff the archive member is the ar(1) string table
/// @brief Determine if this member is the ar(1) string table.
bool isStringTable() const { return flags&StringTableFlag; }
/// Long filenames are an artifact of the ar(1) file format which allows
/// up to sixteen characters in its header and doesn't allow a path
/// separator character (/). To avoid this, a "long format" member name is
/// allowed that doesn't have this restriction. This method determines if
/// that "long format" is used for this member.
/// @returns true iff the file name uses the long form
/// @brief Determine if the member has a long file name
bool hasLongFilename() const { return flags&HasLongFilenameFlag; }
/// This method causes the archive member to be replaced with the contents
/// of the file specified by \p File. The contents of \p this will be
/// updated to reflect the new data from \p File. The \p File must exist and
/// be readable on entry to this method.
/// @returns true if an error occurred, false otherwise
/// @brief Replace contents of archive member with a new file.
bool replaceWith(StringRef aFile, std::string* ErrMsg);
/// @}
/// @name Data
/// @{
private:
Archive *parent; ///< Pointer to parent archive
std::string path; ///< Path of file containing the member
uint32_t User;
uint32_t Group;
uint32_t Mode;
sys::TimeValue ModTime;
uint64_t Size;
unsigned flags; ///< Flags about the archive member
const char *data; ///< Data for the member
/// @}
/// @name Constructors
/// @{
public:
/// The default constructor is only used by the Archive's iplist when it
/// constructs the list's sentry node.
ArchiveMember();
private:
/// Used internally by the Archive class to construct an ArchiveMember.
/// The contents of the ArchiveMember are filled out by the Archive class.
explicit ArchiveMember(Archive *PAR);
// So Archive can construct an ArchiveMember
friend class llvm::Archive;
/// @}
};
/// This class defines the interface to LLVM Archive files. The Archive class
/// presents the archive file as an ilist of ArchiveMember objects. The members
/// can be rearranged in any fashion either by directly editing the ilist or by
/// using editing methods on the Archive class (recommended). The Archive
/// class also provides several ways of accessing the archive file for various
/// purposes such as editing and linking. Full symbol table support is provided
/// for loading only those files that resolve symbols. Note that read
/// performance of this library is _crucial_ for performance of JIT type
/// applications and the linkers. Consequently, the implementation of the class
/// is optimized for reading.
class Archive {
/// @name Types
/// @{
public:
/// This is the ilist type over which users may iterate to examine
/// the contents of the archive
/// @brief The ilist type of ArchiveMembers that Archive contains.
typedef iplist<ArchiveMember> MembersList;
/// @brief Forward mutable iterator over ArchiveMember
typedef MembersList::iterator iterator;
/// @brief Forward immutable iterator over ArchiveMember
typedef MembersList::const_iterator const_iterator;
/// @brief Reverse mutable iterator over ArchiveMember
typedef std::reverse_iterator<iterator> reverse_iterator;
/// @brief Reverse immutable iterator over ArchiveMember
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
/// @brief The in-memory version of the symbol table
typedef std::map<std::string,unsigned> SymTabType;
/// @}
/// @name ilist accessor methods
/// @{
public:
inline iterator begin() { return members.begin(); }
inline const_iterator begin() const { return members.begin(); }
inline iterator end () { return members.end(); }
inline const_iterator end () const { return members.end(); }
inline reverse_iterator rbegin() { return members.rbegin(); }
inline const_reverse_iterator rbegin() const { return members.rbegin(); }
inline reverse_iterator rend () { return members.rend(); }
inline const_reverse_iterator rend () const { return members.rend(); }
inline size_t size() const { return members.size(); }
inline bool empty() const { return members.empty(); }
inline const ArchiveMember& front() const { return members.front(); }
inline ArchiveMember& front() { return members.front(); }
inline const ArchiveMember& back() const { return members.back(); }
inline ArchiveMember& back() { return members.back(); }
/// @}
/// @name ilist mutator methods
/// @{
public:
/// This method splices a \p src member from an archive (possibly \p this),
/// to a position just before the member given by \p dest in \p this. When
/// the archive is written, \p src will be written in its new location.
/// @brief Move a member to a new location
inline void splice(iterator dest, Archive& arch, iterator src)
{ return members.splice(dest,arch.members,src); }
/// This method erases a \p target member from the archive. When the
/// archive is written, it will no longer contain \p target. The associated
/// ArchiveMember is deleted.
/// @brief Erase a member.
inline iterator erase(iterator target) { return members.erase(target); }
/// @}
/// @name Constructors
/// @{
public:
/// Create an empty archive file and associate it with the \p Filename. This
/// method does not actually create the archive disk file. It creates an
/// empty Archive object. If the writeToDisk method is called, the archive
/// file \p Filename will be created at that point, with whatever content
/// the returned Archive object has at that time.
/// @returns An Archive* that represents the new archive file.
/// @brief Create an empty Archive.
static Archive *CreateEmpty(
StringRef Filename, ///< Name of the archive to (eventually) create.
LLVMContext &C ///< Context to use for global information
);
/// Open an existing archive and load its contents in preparation for
/// editing. After this call, the member ilist is completely populated based
/// on the contents of the archive file. You should use this form of open if
/// you intend to modify the archive or traverse its contents (e.g. for
/// printing).
/// @brief Open and load an archive file
static Archive *OpenAndLoad(
StringRef filePath, ///< The file path to open and load
LLVMContext &C, ///< The context to use for global information
std::string *ErrorMessage ///< An optional error string
);
/// This destructor cleans up the Archive object, releases all memory, and
/// closes files. It does nothing with the archive file on disk. If you
/// haven't used the writeToDisk method by the time the destructor is
/// called, all changes to the archive will be lost.
/// @brief Destruct in-memory archive
~Archive();
/// @}
/// @name Accessors
/// @{
public:
/// @returns the path to the archive file.
/// @brief Get the archive path.
StringRef getPath() { return archPath; }
/// This method is provided so that editing methods can be invoked directly
/// on the Archive's iplist of ArchiveMember. However, it is recommended
/// that the usual STL style iterator interface be used instead.
/// @returns the iplist of ArchiveMember
/// @brief Get the iplist of the members
MembersList& getMembers() { return members; }
/// This method returns the offset in the archive file to the first "real"
/// file member. Archive files, on disk, have a signature and might have a
/// symbol table that precedes the first actual file member. This method
/// allows you to determine what the size of those fields are.
/// @returns the offset to the first "real" file member in the archive.
/// @brief Get the offset to the first "real" file member in the archive.
unsigned getFirstFileOffset() { return firstFileOffset; }
/// @}
/// @name Mutators
/// @{
public:
/// This method is the only way to get the archive written to disk. It
/// creates or overwrites the file specified when \p this was created
/// or opened. The arguments provide options for writing the archive. If
/// \p CreateSymbolTable is true, the archive is scanned for bitcode files
/// and a symbol table of the externally visible function and global
/// variable names is created. If \p TruncateNames is true, the names of the
/// archive members will have their path component stripped and the file
/// name will be truncated at 15 characters. If \p Compress is specified,
/// all archive members will be compressed before being written. If
/// \p PrintSymTab is true, the symbol table will be printed to std::cout.
/// @returns true if an error occurred, \p error set to error message;
/// returns false if the writing succeeded.
/// @brief Write (possibly modified) archive contents to disk
bool writeToDisk(
std::string* ErrMessage=0 ///< If non-null, where error msg is set
);
/// This method adds a new file to the archive. The \p filename is examined
/// to determine just enough information to create an ArchiveMember object
/// which is then inserted into the Archive object's ilist at the location
/// given by \p where.
/// @returns true if an error occurred, false otherwise
/// @brief Add a file to the archive.
bool addFileBefore(StringRef filename, ///< The file to be added
iterator where, ///< Insertion point
std::string *ErrMsg ///< Optional error message location
);
/// @}
/// @name Implementation
/// @{
protected:
/// @brief Construct an Archive for \p filename and optionally map it
/// into memory.
explicit Archive(StringRef filename, LLVMContext& C);
/// @returns A fully populated ArchiveMember or 0 if an error occurred.
/// @brief Parse the header of a member starting at \p At
ArchiveMember* parseMemberHeader(
const char*&At, ///< The pointer to the location we're parsing
const char*End, ///< The pointer to the end of the archive
std::string* error ///< Optional error message catcher
);
/// @param ErrMessage Set to address of a std::string to get error messages
/// @returns false on error
/// @brief Check that the archive signature is correct
bool checkSignature(std::string* ErrMessage);
/// @param ErrMessage Set to address of a std::string to get error messages
/// @returns false on error
/// @brief Load the entire archive.
bool loadArchive(std::string* ErrMessage);
/// @param ErrMessage Set to address of a std::string to get error messages
/// @returns false on error
/// @brief Load just the symbol table.
bool loadSymbolTable(std::string* ErrMessage);
/// Writes one ArchiveMember to an ofstream. If an error occurs, returns
/// false, otherwise true. If an error occurs and error is non-null then
/// it will be set to an error message.
/// @returns false if writing member succeeded,
/// returns true if writing member failed, \p error set to error message.
bool writeMember(
const ArchiveMember& member, ///< The member to be written
raw_fd_ostream& ARFile, ///< The file to write member onto
std::string* ErrMessage ///< If non-null, place were error msg is set
);
/// @brief Fill in an ArchiveMemberHeader from ArchiveMember.
bool fillHeader(const ArchiveMember&mbr,
ArchiveMemberHeader& hdr,int sz) const;
/// @brief Maps archive into memory
bool mapToMemory(std::string* ErrMsg);
/// @brief Frees all the members and unmaps the archive file.
void cleanUpMemory();
/// This type is used to keep track of bitcode modules loaded from the
/// symbol table. It maps the file offset to a pair that consists of the
/// associated ArchiveMember and the Module.
/// @brief Module mapping type
typedef std::map<unsigned,std::pair<Module*,ArchiveMember*> >
ModuleMap;
/// @}
/// @name Data
/// @{
protected:
std::string archPath; ///< Path to the archive file we read/write
MembersList members; ///< The ilist of ArchiveMember
MemoryBuffer *mapfile; ///< Raw Archive contents mapped into memory
const char* base; ///< Base of the memory mapped file data
std::string strtab; ///< The string table for long file names
unsigned firstFileOffset; ///< Offset to first normal file.
ModuleMap modules; ///< The modules loaded via symbol lookup.
LLVMContext& Context; ///< This holds global data.
/// @}
/// @name Hidden
/// @{
private:
Archive() LLVM_DELETED_FUNCTION;
Archive(const Archive&) LLVM_DELETED_FUNCTION;
Archive& operator=(const Archive&) LLVM_DELETED_FUNCTION;
/// @}
};
} // End llvm namespace
#endif