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Complete rewrite to get first working version. 

llvm-svn: 17754
This commit is contained in:
Reid Spencer 2004-11-14 21:47:41 +00:00
parent ec7a80bad2
commit 791ad3829a
1 changed files with 411 additions and 193 deletions
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llvm/include/llvm/Bytecode/Archive.h
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@ -7,130 +7,309 @@
//
//===----------------------------------------------------------------------===//
//
// This header file defines the interface to LLVM Archive files. The interface
// is provided by the Archive class implemented by the lib/Bytecode/Archive
// library. This library is used to read and write archive (*.a) files that
// contain LLVM bytecode files (or others). It provides rudimentary capabilities
// to construct an archive file from a set of files, read the archive members
// into memory, search the archive for member files that fulfill unresolved
// symbols, and extract the archive back to the file system. 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
// library is optimized for reading.
// This header file declares the Archive and ArchiveMember classes that provide
// manipulation of LLVM Archive files. The implementation is provided by the
// lib/Bytecode/Archive library. This library is used to read and write
// archive (*.a) files that contain LLVM bytecode files (or others).
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_BYTECODE_ARCHIVE_H
#define LLVM_BYTECODE_ARCHIVE_H
#include "llvm/ADT/ilist"
#include "llvm/System/Path.h"
#include "llvm/System/MappedFile.h"
#include <map>
#include <set>
#include <fstream>
namespace llvm {
class ModuleProvider;
class Module;
// Forward declare classes
class ModuleProvider; // From VMCore
class Module; // From VMCore
class Archive; // Declared below
class ArchiveMemberHeader; // Internal implementation class
/// This class represents an archive file. It abstracts away the file format,
/// and logical operations that can be done on an archive file. It also provides
/// utilities for controlling the runtime loading/reading of the archive file
/// to provide efficient access mechanisms for JIT systems and linkers.
class Archive {
/// 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 {
/// @name Types
/// @{
public:
/// The user's interface to the archive symbol table. This multimap allows
/// symbols to be looked up and modules to be instantiated from the file
/// lazily via the ModuleProvider::materializeModule method.
typedef std::map<std::string,ModuleProvider*> SymTab;
/// 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 {
CompressedFlag = 1, ///< Member is a normal compressed file
ForeignSymbolTableFlag = 2, ///< Member is a foreign symbol table
LLVMSymbolTableFlag = 4, ///< Member is an LLVM symbol table
BytecodeFlag = 8, ///< Member is uncompressed bytecode
CompressedBytecodeFlag = 16, ///< Member is compressed bytecode
HasPathFlag = 32, ///< Member has a full or partial path
HasLongFilenameFlag = 64, ///< Member uses the long filename syntax
StringTableFlag = 256, ///< Member is an ar(1) format string table
};
/// This typedef is just shorthand for a vector of Path names
typedef std::vector<sys::Path> PathList;
/// @}
/// @name Accessors
/// @{
public:
/// @returns the parent Archive instance
/// @brief Get the archive associated with this member
Archive* getArchive() const { return parent; }
/// This typedef is just shorthand for a vector of Modules
typedef std::vector<Module*> ModuleList;
/// @returns the path to the Archive's file
/// @brief Get the path to the archive member
const sys::Path& 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 info.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 info.group; }
/// The "mode" specifies the access permissions for the file per Unix
/// security. This may not have any applicabiity 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 info.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 info.modTime; }
/// @returns the size of the archive member in bytes.
/// @brief Get the size of the archive member.
unsigned getSize() const { return info.fileSize; }
/// 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 void* getData() const { return data; }
/// This method determines if the member is a regular compressed file. Note
/// that compressed bytecode files will yield "false" for this method.
/// @see isCompressedBytecode()
/// @returns true iff the archive member is a compressed regular file.
/// @brief Determine if the member is a compressed regular file.
bool isCompressed() const { return flags&CompressedFlag; }
/// @returns true iff the member is a foreign (non-LLVM) symbol table
/// @brief Determine if this member is a foreign symbol table.
bool isForeignSymbolTable() const { return flags&ForeignSymbolTableFlag; }
/// @returns true iff the archive member is the LLVM symbol table
/// @brief Determine if this member is the LLVM symbol table.
bool isLLVMSymbolTable() const { return flags&LLVMSymbolTableFlag; }
/// @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; }
/// @returns true iff the archive member is an uncompressed bytecode file.
/// @brief Determine if this member is a bytecode file.
bool isBytecode() const { return flags&BytecodeFlag; }
/// @returns true iff the archive member is a compressed bytecode file.
/// @brief Determine if the member is a compressed bytecode file.
bool isCompressedBytecode() const { return flags&CompressedBytecodeFlag;}
/// @returns true iff the file name contains a path (directory) component.
/// @brief Determine if the member has a path
bool hasPath() const { return flags&HasPathFlag; }
/// 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 Determin if the member has a long file name
bool hasLongFilename() const { return flags&HasLongFilenameFlag; }
/// This method returns the status info (like Unix stat(2)) for the archive
/// member. The status info provides the file's size, permissions, and
/// modification time. The contents of the Path::StatusInfo structure, other
/// than the size and modification time, may not have utility on non-Unix
/// systems.
/// @returns the status info for the archive member
/// @brief Obtain the status info for the archive member
const sys::Path::StatusInfo& getStatusInfo() const { return info; }
/// 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.
/// @brief Replace contents of archive member with a new file.
void replaceWith(const sys::Path& aFile);
/// @}
/// @name ilist methods - do not use
/// @{
public:
const ArchiveMember *getNext() const { return next; }
const ArchiveMember *getPrev() const { return prev; }
ArchiveMember *getNext() { return next; }
ArchiveMember *getPrev() { return prev; }
void setPrev(ArchiveMember* p) { prev = p; }
void setNext(ArchiveMember* n) { next = n; }
/// @}
/// @name Data
/// @{
private:
ArchiveMember* next; ///< Pointer to next archive member
ArchiveMember* prev; ///< Pointer to previous archive member
Archive* parent; ///< Pointer to parent archive
sys::Path path; ///< Path of file containing the member
sys::Path::StatusInfo info; ///< Status info (size,mode,date)
unsigned flags; ///< Flags about the archive member
const void* data; ///< Data for the member
/// @}
/// @name Constructors
/// @{
public:
/// Create an empty archive file, \p Filename. The returned Archive object
/// will have no file members and an empty symbol table. The actual archive
/// file is not created until the returned Archive object is destructed.
/// @throws std::string if an error occurs
/// 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.
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 interface 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 unsigned 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 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 file.
/// @brief Create an empty Archive.
static Archive* CreateEmpty(
const sys::Path& Filename ///< Name of archive file
const sys::Path& Filename ///< Name of the archive to (eventually) create.
);
#if 0
/// 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(const sys::Path& filePath);
This interface severely complicates the
Archive class. Its commented out until
a final determination is made of whether
we will support adding modules or not.
/// Create a new archive file, \p Filename, from the LLVM modules \p Modules.
/// The module's externally visible linkage symbols will be added to the
/// archive's symbol table. The names of the file members will be obtained
/// from the Module::getModuleId() method. If that name is not unique, it will
/// be made unique by appending a monotonically increasing integer to it. If
/// \p StripName is non-empty, it specifies a prefix to be stripped from the
/// name of the file members. This allows archives with relative path names
/// to be created. The actual archive file is not created until the
/// returned Archive object is destructed.
/// @returns An Archive* that that represents the newly created archive file.
/// @throws std::string if an error occurs
/// @brief Create an archive file from modules.
static Archive* CreateFromModules(
const sys::Path& Filename, ///< Name of archive file
const ModuleList& Modules, ///< Modules to be put in archive
const std::string& StripName="" ///< Prefix to strip from member names
);
#endif
/// Create a new archive file, \p Filename, from a set of existing \p Files.
/// Each entry in \p Files will be added to the archive. If any file is an
/// llvm bytecode file, its externally visible linkage symbols will be added
/// to the archive's symbol table. If any of the paths in \p Files refer to
/// directories, those directories will be ignored. Full path names to
/// files must be provided. However, if \p StripName is non-empty, it
/// specifies a prefix string to be removed from each path before it is
/// written as the name of the file member. Any path names that do not have
/// the \p StripName as a prefix will be saved with the full path name
/// provided in \p Files. This permits archives relative to a top level
/// directory to be created.
/// @throws std::string if an error occurs
/// @brief Create an archive file from files.
static Archive* CreateFromFiles(
const sys::Path& Filename, ///< Name of archive file
const PathList& Files, ///< File paths to be put in archive
const std::string& StripName="" ///< Prefix path name to strip from names
/// This method opens an existing archive file from \p Filename and reads in
/// its symbol table without reading in any of the archive's members. This
/// reduces both I/O and cpu time in opening the archive if it is to be used
/// solely for symbol lookup (e.g. during linking). The \p Filename must
/// exist and be an archive file or an exception will be thrown. This form
/// of opening the archive is intended for read-only operations that need to
/// locate members via the symbol table for link editing. Since the archve
/// members are not read by this method, the archive will appear empty upon
/// return. If editing operations are performed on the archive, they will
/// completely replace the contents of the archive! It is recommended that
/// if this form of opening the archive is used that only the symbol table
/// lookup methods (getSymbolTable, findModuleDefiningSymbol, and
/// findModulesDefiningSymbols) be used.
/// @throws std::string if an error occurs opening the file
/// @returns an Archive* that represents the archive file.
/// @brief Open an existing archive and load its symbols.
static Archive* OpenAndLoadSymbols(
const sys::Path& Filename ///< Name of the archive file to open
);
/// Open an existing archive file from \p Filename. The necessary
/// arrangements to read the file are made, but nothing much is actually
/// read from the file. Use the Accessor methods below to lazily obtain
/// those portions of the file that are of interest.
/// @throws std::string if an error occurs
/// @brief Open an existing archive.
static Archive* Open(
const sys::Path& Filename ///< Name of the archive file
);
/// This destructor "finalizes" the archive. Regardless of whether the
/// archive was created or opened, all memory associated with the archive
/// is released, including any SymTab* returned by the getSymbolTable()
/// method, any ModuleProviders and their associated Modules returned by
/// any interface method, etc. Additionally, if the archive was created
/// using one of the Create* methods, the archive is written to disk in
/// its final format. After this method exits, none of the memory
/// associated with the archive is valid. It is the user's responsibility
/// to ensure that all references to such memory is removed before the
/// Archive is destructed.
/// 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.
/// @throws std::string if an error occurs
/// @brief Destruct in-memory archive
~Archive();
@ -139,6 +318,48 @@ we will support adding modules or not.
/// @name Accessors
/// @{
public:
/// @returns the path to the archive file.
/// @brief Get the archive path.
const sys::Path& 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 allows direct query of the Archive's symbol table. The
/// symbol table is a std::map of std::string (the symbol) to unsigned (the
/// file offset). Note that for efficiency reasons, the offset stored in
/// the symbol table is not the actual offset. It is the offset from the
/// beginning of the first "real" file member (after the symbol table). Use
/// the getFirstFileOffset() to obtain that offset and add this value to the
/// offset in the symbol table to obtain the real file offset. Note that
/// there is purposefully no interface provided by Archive to look up
/// members by their offset. Use the findModulesDefiningSymbols and
/// findModuleDefiningSymbol methods instead.
/// @returns the Archive's symbol table.
/// @brief Get the archive's symbol table
const SymTabType& getSymbolTable() { return symTab; }
/// 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; }
/// This method will scan the archive for bytecode modules, interpret them
/// and return a vector of the instantiated modules in \p Modules. If an
/// error occurs, this method will return true. If \p ErrMessage is not null
/// and an error occurs, \p *ErrMessage will be set to a string explaining
/// the error that occurred.
/// @returns true if an error occurred
/// @brief Instantiate all the bytecode modules located in the archive
bool getAllModules(std::vector<Module*>& Modules, std::string* ErrMessage);
/// This accessor looks up the \p symbol in the archive's symbol table and
/// returns the associated module that defines that symbol. This method can
/// be called as many times as necessary. This is handy for linking the
@ -147,124 +368,123 @@ we will support adding modules or not.
/// caller. It is managed internally by the Archive class. It is possible
/// that multiple calls to this accessor will return the same ModuleProvider
/// instance because the associated module defines multiple symbols.
/// @throws std::string if an error occurs
/// @returns The ModuleProvider* found or null if the archive does not
/// contain a module that defines the \p symbol.
/// @brief Look up a module by symbol name.
ModuleProvider* findModuleContainingSymbol(
ModuleProvider* findModuleDefiningSymbol(
const std::string& symbol ///< Symbol to be sought
) const;
/// Return the list of all the \p Paths for the file members in the archive.
/// This is handy for generating the table of contents of the archive. Note
/// that \p Paths is *not* cleared before it is populated. New entries are
/// appended to the end of the PathList.
/// @throw std::string if an error occurs
/// @returns nothing
/// @brief Get all the paths in the archive
void getAllPaths(
PathList& Paths ///< The list of paths returned
);
/// This method returns a caller readable SymTab object which is a map
/// of symbol names to ModuleProviders. Callers can traverse this symbol
/// table, look up specific symbols, etc. and materialize any Modules they
/// want with the associated ModuleProviders. It is unnecessary to call
/// this accessor more than once as the same object is alway returned, even
/// if changes have been made.
/// @returns a constant SymTab* that is the same for every invocation. The
/// caller should not attempt to free or modify this SymTab object, just use
/// it.
/// @brief Get the archive's symbol table.
const SymTab* getSymbolTable();
/// Extract the contents of the archive back to the file system using \p
/// RootDir as the directory at the root of the extraction. Each file
/// member is written back as a separate file. If \p flat is false, then
/// directories are created as necessary to restore the files to the correct
/// sub-directory of \p root as specified in the full path of the file
/// member. Otherwise, paths are ignored and all file members will be
/// extracted to the \p root directory using only the filename portion of
/// the path (directories ignored). If \p symtab is true, the archive's
/// symbol table will also be extracted to a file named __SYMTAB.
/// @returns nothing
/// @throws std::string if an error occurs
/// @brief Extract archive contents to a file.
void extractAllToDirectory(
const sys::Path& RootDir, ///< The root directory for extraction
bool Flat = true, ///< false = recreate directory structure
bool Symtab = false ///< true = extract symbol table too
);
/// Extract one file in the archive back to the file system using \p RootDir
/// as the directory at the root of the extraction. The file \p name is
/// extracted and placed into \p RootDir. If \p Flat is false, then any
/// intermediate directory names in the file member's path will also be
/// created. Otherwise, the member's file is created in RootDir ignoring
/// the leading path and using only the member's file name.
/// @throws std::string if an error occurs.
/// @returns nothing
/// @brief Extract a single archive file.
void extractOneFileToDirectory(
const sys::Path& RootDir, ///< The root directory for extraction
const sys::Path& name, ///< Name of file to extract
bool Flat = true ///< false = recreate directories
/// This method is similar to findModuleDefiningSymbol but allows lookup of
/// more than one symbol at a time. If \p symbols contains a list of
/// undefined symbols in some module, then calling this method is like
/// making one complete pass through the archive to resolve symbols but is
/// more efficient than looking at the individual members.
/// @brief Look up multiple symbols in the archive.
void findModulesDefiningSymbols(
const std::set<std::string>& symbols, ///< Symbols to be sought
std::set<ModuleProvider*>& modules ///< The modules matching \p symbols
);
/// @}
/// @name Mutators
/// @{
public:
/// Each entry in \p Files will be added to the archive. If any file is an
/// llvm bytecode file, its externally visible linkage symbols will be added
/// to the archive's symbol table. If any of the paths in \p Files refer to
/// directories, those directories will be ignored. Full path names to
/// files must be provided. However, if \p StripName is non-empty, it
/// specifies a prefix string to be removed from each path before it is
/// written as the name of the file member. Any path names that do not have
/// the \p StripName as a prefix will be saved with the full path name
/// provided. This permits archives relative to a top level directory
/// to be created.
/// 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 bytecode 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.
/// @throws std::string if an error occurs
/// @returns nothing
/// @brief Add a set of files to the archive.
void addFiles(
const PathList& Files, ///< The names of files to add to archive
const std::string& StripName="" ///< Prefix path to strip from names
/// @brief Write (possibly modified) archive contents to disk
void writeToDisk(
bool CreateSymbolTable=false, ///< Create Symbol table
bool TruncateNames=false, ///< Truncate the filename to 15 chars
bool Compress=false, ///< Compress files
bool PrintSymTab=false ///< Dump symtab to std::out if created
);
#if 0
This interface severely complicates the
Archive class. Its commented out until
a final determination is made of whether
we will support adding modules or not.
/// Add a set of Modules to the archive. Names of member files will
/// be taken from the Module identifier (Module::getModuleIdentifier) if it
/// is unique. Non-unique member names will be made unique by appending a
/// number. The symbol table will be augmented with the global symbols of
/// all the modules provided. If \p StripName is non-empty, it
/// specifies a prefix string to be removed from each moduleId before it is
/// written as the name of the file member. Any path names that do not have
/// the \p StripName as a prefix will be saved with the full path name
/// provided. This permits archives relative to a top level directory to
/// be created.
/// @throws std::string if an error occurs
/// 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.
/// @throws std::string if an error occurs reading the \p filename.
/// @returns nothing
/// @brief Add a set of modules to the archive.
void addModules(
const ModuleList& Modules, ///< The modules to add to the archive
const std::string& StripName="" ///< Prefix path to strip from names
);
#endif
/// @brief Add a file to the archive.
void addFileBefore(const sys::Path& filename, iterator where);
/// This method moves a \p target member to a new location in the archive,
/// just before the member given by \p iterator. When the archive is
/// written, \p target will be written in its new location.
/// @brief Move a member to a new location
void moveMemberBefore(iterator target, iterator where);
/// This method removes 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 Remove a member.
void remove(iterator target);
/// @}
/// @name Implementation
/// @{
private:
/// @brief Construct an Archive for \p filename and optionally map it
/// into memory.
Archive(const sys::Path& filename, bool map = false );
/// @brief Parse the symbol table at \p data.
void parseSymbolTable(const void* data,unsigned len);
/// @brief Parse the header of a member starting at \p At
ArchiveMember* parseMemberHeader(const char*&At,const char*End);
/// @brief Check that the archive signature is correct
void checkSignature();
/// @brief Load the entire archive.
void loadArchive();
/// @brief Load just the symbol table.
void loadSymbolTable();
/// @brief Write the symbol table to an ofstream.
void writeSymbolTable(std::ofstream& ARFile,bool PrintSymTab);
/// @brief Write one ArchiveMember to an ofstream.
void writeMember(const ArchiveMember& member, std::ofstream& ARFile,
bool CreateSymbolTable, bool TruncateNames, bool ShouldCompress);
/// @brief Fill in an ArchiveMemberHeader from ArchiveMember.
bool fillHeader(const ArchiveMember&mbr,
ArchiveMemberHeader& hdr,int sz, bool TruncateNames) const;
/// This type is used to keep track of bytecode modules loaded from the
/// symbol table. It maps the file offset to a pair that consists of the
/// associated ArchiveMember and the ModuleProvider.
/// @brief Module mapping type
typedef std::map<unsigned,std::pair<ModuleProvider*,ArchiveMember*> >
ModuleMap;
/// @}
/// @name Data
/// @{
private:
class ArchiveInternals;
ArchiveInternals* impl; ///< Implementation class
sys::Path archPath; ///< Path to the archive file we read/write
MembersList members; ///< The ilist of ArchiveMember
sys::MappedFile* mapfile; ///< Raw Archive contents mapped into memory
const char* base; ///< Base of the memory mapped file data
SymTabType symTab; ///< The symbol table
std::string strtab; ///< The string table for long file names
unsigned symTabSize; ///< Size in bytes of symbol table
unsigned firstFileOffset; ///< Offset to first normal file.
ModuleMap modules; ///< The modules loaded via symbol lookup.
/// @}
/// @name Hidden
/// @{
@ -277,6 +497,4 @@ we will support adding modules or not.
} // End llvm namespace
// vim: sw=2 ai
#endif