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Support: Rename Path.h to PathV1.h and add a new Path.h that includes both V1 and V2.

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llvm-svn: 122065
This commit is contained in:
Michael J. Spencer 2010-12-17 17:22:36 +00:00
parent 38e6fdfd1d
commit 63aaa03399
2 changed files with 738 additions and 722 deletions
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727
include/llvm/Support/Path.h
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@ -1,4 +1,4 @@
//===- llvm/Support/Path.h - Path Operating System Concept -------*- C++ -*-===//
//===- llvm/Support/Path.h - Path Operating System Concept ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
@ -7,727 +7,10 @@
//
//===----------------------------------------------------------------------===//
//
// This file declares the llvm::sys::Path class.
// This file currently includes both PathV1 and PathV2 to facilitate moving
// clients over to the new interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SYSTEM_PATH_H
#define LLVM_SYSTEM_PATH_H
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/TimeValue.h"
#include <set>
#include <string>
#include <vector>
namespace llvm {
namespace sys {
/// This structure provides basic file system information about a file. It
/// is patterned after the stat(2) Unix operating system call but made
/// platform independent and eliminates many of the unix-specific fields.
/// However, to support llvm-ar, the mode, user, and group fields are
/// retained. These pertain to unix security and may not have a meaningful
/// value on non-Unix platforms. However, the other fields should
/// always be applicable on all platforms. The structure is filled in by
/// the PathWithStatus class.
/// @brief File status structure
class FileStatus {
public:
uint64_t fileSize; ///< Size of the file in bytes
TimeValue modTime; ///< Time of file's modification
uint32_t mode; ///< Mode of the file, if applicable
uint32_t user; ///< User ID of owner, if applicable
uint32_t group; ///< Group ID of owner, if applicable
uint64_t uniqueID; ///< A number to uniquely ID this file
bool isDir : 1; ///< True if this is a directory.
bool isFile : 1; ///< True if this is a file.
FileStatus() : fileSize(0), modTime(0,0), mode(0777), user(999),
group(999), uniqueID(0), isDir(false), isFile(false) { }
TimeValue getTimestamp() const { return modTime; }
uint64_t getSize() const { return fileSize; }
uint32_t getMode() const { return mode; }
uint32_t getUser() const { return user; }
uint32_t getGroup() const { return group; }
uint64_t getUniqueID() const { return uniqueID; }
};
/// This class provides an abstraction for the path to a file or directory
/// in the operating system's filesystem and provides various basic operations
/// on it. Note that this class only represents the name of a path to a file
/// or directory which may or may not be valid for a given machine's file
/// system. The class is patterned after the java.io.File class with various
/// extensions and several omissions (not relevant to LLVM). A Path object
/// ensures that the path it encapsulates is syntactically valid for the
/// operating system it is running on but does not ensure correctness for
/// any particular file system. That is, a syntactically valid path might
/// specify path components that do not exist in the file system and using
/// such a Path to act on the file system could produce errors. There is one
/// invalid Path value which is permitted: the empty path. The class should
/// never allow a syntactically invalid non-empty path name to be assigned.
/// Empty paths are required in order to indicate an error result in some
/// situations. If the path is empty, the isValid operation will return
/// false. All operations will fail if isValid is false. Operations that
/// change the path will either return false if it would cause a syntactically
/// invalid path name (in which case the Path object is left unchanged) or
/// throw an std::string exception indicating the error. The methods are
/// grouped into four basic categories: Path Accessors (provide information
/// about the path without accessing disk), Disk Accessors (provide
/// information about the underlying file or directory), Path Mutators
/// (change the path information, not the disk), and Disk Mutators (change
/// the disk file/directory referenced by the path). The Disk Mutator methods
/// all have the word "disk" embedded in their method name to reinforce the
/// notion that the operation modifies the file system.
/// @since 1.4
/// @brief An abstraction for operating system paths.
class Path {
/// @name Constructors
/// @{
public:
/// Construct a path to the root directory of the file system. The root
/// directory is a top level directory above which there are no more
/// directories. For example, on UNIX, the root directory is /. On Windows
/// it is file:///. Other operating systems may have different notions of
/// what the root directory is or none at all. In that case, a consistent
/// default root directory will be used.
static Path GetRootDirectory();
/// Construct a path to a unique temporary directory that is created in
/// a "standard" place for the operating system. The directory is
/// guaranteed to be created on exit from this function. If the directory
/// cannot be created, the function will throw an exception.
/// @returns an invalid path (empty) on error
/// @param ErrMsg Optional place for an error message if an error occurs
/// @brief Constrct a path to an new, unique, existing temporary
/// directory.
static Path GetTemporaryDirectory(std::string* ErrMsg = 0);
/// Construct a vector of sys::Path that contains the "standard" system
/// library paths suitable for linking into programs.
/// @brief Construct a path to the system library directory
static void GetSystemLibraryPaths(std::vector<sys::Path>& Paths);
/// Construct a vector of sys::Path that contains the "standard" bitcode
/// library paths suitable for linking into an llvm program. This function
/// *must* return the value of LLVM_LIB_SEARCH_PATH as well as the value
/// of LLVM_LIBDIR. It also must provide the System library paths as
/// returned by GetSystemLibraryPaths.
/// @see GetSystemLibraryPaths
/// @brief Construct a list of directories in which bitcode could be
/// found.
static void GetBitcodeLibraryPaths(std::vector<sys::Path>& Paths);
/// Find the path to a library using its short name. Use the system
/// dependent library paths to locate the library.
/// @brief Find a library.
static Path FindLibrary(std::string& short_name);
/// Construct a path to the default LLVM configuration directory. The
/// implementation must ensure that this is a well-known (same on many
/// systems) directory in which llvm configuration files exist. For
/// example, on Unix, the /etc/llvm directory has been selected.
/// @brief Construct a path to the default LLVM configuration directory
static Path GetLLVMDefaultConfigDir();
/// Construct a path to the LLVM installed configuration directory. The
/// implementation must ensure that this refers to the "etc" directory of
/// the LLVM installation. This is the location where configuration files
/// will be located for a particular installation of LLVM on a machine.
/// @brief Construct a path to the LLVM installed configuration directory
static Path GetLLVMConfigDir();
/// Construct a path to the current user's home directory. The
/// implementation must use an operating system specific mechanism for
/// determining the user's home directory. For example, the environment
/// variable "HOME" could be used on Unix. If a given operating system
/// does not have the concept of a user's home directory, this static
/// constructor must provide the same result as GetRootDirectory.
/// @brief Construct a path to the current user's "home" directory
static Path GetUserHomeDirectory();
/// Construct a path to the current directory for the current process.
/// @returns The current working directory.
/// @brief Returns the current working directory.
static Path GetCurrentDirectory();
/// Return the suffix commonly used on file names that contain an
/// executable.
/// @returns The executable file suffix for the current platform.
/// @brief Return the executable file suffix.
static StringRef GetEXESuffix();
/// Return the suffix commonly used on file names that contain a shared
/// object, shared archive, or dynamic link library. Such files are
/// linked at runtime into a process and their code images are shared
/// between processes.
/// @returns The dynamic link library suffix for the current platform.
/// @brief Return the dynamic link library suffix.
static StringRef GetDLLSuffix();
/// GetMainExecutable - Return the path to the main executable, given the
/// value of argv[0] from program startup and the address of main itself.
/// In extremis, this function may fail and return an empty path.
static Path GetMainExecutable(const char *argv0, void *MainAddr);
/// This is one of the very few ways in which a path can be constructed
/// with a syntactically invalid name. The only *legal* invalid name is an
/// empty one. Other invalid names are not permitted. Empty paths are
/// provided so that they can be used to indicate null or error results in
/// other lib/System functionality.
/// @brief Construct an empty (and invalid) path.
Path() : path() {}
Path(const Path &that) : path(that.path) {}
/// This constructor will accept a char* or std::string as a path. No
/// checking is done on this path to determine if it is valid. To
/// determine validity of the path, use the isValid method.
/// @param p The path to assign.
/// @brief Construct a Path from a string.
explicit Path(StringRef p);
/// This constructor will accept a character range as a path. No checking
/// is done on this path to determine if it is valid. To determine
/// validity of the path, use the isValid method.
/// @param StrStart A pointer to the first character of the path name
/// @param StrLen The length of the path name at StrStart
/// @brief Construct a Path from a string.
Path(const char *StrStart, unsigned StrLen);
/// @}
/// @name Operators
/// @{
public:
/// Makes a copy of \p that to \p this.
/// @returns \p this
/// @brief Assignment Operator
Path &operator=(const Path &that) {
path = that.path;
return *this;
}
/// Makes a copy of \p that to \p this.
/// @param that A StringRef denoting the path
/// @returns \p this
/// @brief Assignment Operator
Path &operator=(StringRef that);
/// Compares \p this Path with \p that Path for equality.
/// @returns true if \p this and \p that refer to the same thing.
/// @brief Equality Operator
bool operator==(const Path &that) const;
/// Compares \p this Path with \p that Path for inequality.
/// @returns true if \p this and \p that refer to different things.
/// @brief Inequality Operator
bool operator!=(const Path &that) const { return !(*this == that); }
/// Determines if \p this Path is less than \p that Path. This is required
/// so that Path objects can be placed into ordered collections (e.g.
/// std::map). The comparison is done lexicographically as defined by
/// the std::string::compare method.
/// @returns true if \p this path is lexicographically less than \p that.
/// @brief Less Than Operator
bool operator<(const Path& that) const;
/// @}
/// @name Path Accessors
/// @{
public:
/// This function will use an operating system specific algorithm to
/// determine if the current value of \p this is a syntactically valid
/// path name for the operating system. The path name does not need to
/// exist, validity is simply syntactical. Empty paths are always invalid.
/// @returns true iff the path name is syntactically legal for the
/// host operating system.
/// @brief Determine if a path is syntactically valid or not.
bool isValid() const;
/// This function determines if the contents of the path name are empty.
/// That is, the path name has a zero length. This does NOT determine if
/// if the file is empty. To get the length of the file itself, Use the
/// PathWithStatus::getFileStatus() method and then the getSize() method
/// on the returned FileStatus object.
/// @returns true iff the path is empty.
/// @brief Determines if the path name is empty (invalid).
bool isEmpty() const { return path.empty(); }
/// This function returns the last component of the path name. The last
/// component is the file or directory name occuring after the last
/// directory separator. If no directory separator is present, the entire
/// path name is returned (i.e. same as toString).
/// @returns StringRef containing the last component of the path name.
/// @brief Returns the last component of the path name.
StringRef getLast() const;
/// This function strips off the path and suffix of the file or directory
/// name and returns just the basename. For example /a/foo.bar would cause
/// this function to return "foo".
/// @returns StringRef containing the basename of the path
/// @brief Get the base name of the path
StringRef getBasename() const;
/// This function strips off the suffix of the path beginning with the
/// path separator ('/' on Unix, '\' on Windows) and returns the result.
StringRef getDirname() const;
/// This function strips off the path and basename(up to and
/// including the last dot) of the file or directory name and
/// returns just the suffix. For example /a/foo.bar would cause
/// this function to return "bar".
/// @returns StringRef containing the suffix of the path
/// @brief Get the suffix of the path
StringRef getSuffix() const;
/// Obtain a 'C' string for the path name.
/// @returns a 'C' string containing the path name.
/// @brief Returns the path as a C string.
const char *c_str() const { return path.c_str(); }
const std::string &str() const { return path; }
/// size - Return the length in bytes of this path name.
size_t size() const { return path.size(); }
/// empty - Returns true if the path is empty.
unsigned empty() const { return path.empty(); }
/// @}
/// @name Disk Accessors
/// @{
public:
/// This function determines if the path name is absolute, as opposed to
/// relative.
/// @brief Determine if the path is absolute.
bool isAbsolute() const;
/// This function determines if the path name is absolute, as opposed to
/// relative.
/// @brief Determine if the path is absolute.
static bool isAbsolute(const char *NameStart, unsigned NameLen);
/// This function opens the file associated with the path name provided by
/// the Path object and reads its magic number. If the magic number at the
/// start of the file matches \p magic, true is returned. In all other
/// cases (file not found, file not accessible, etc.) it returns false.
/// @returns true if the magic number of the file matches \p magic.
/// @brief Determine if file has a specific magic number
bool hasMagicNumber(StringRef magic) const;
/// This function retrieves the first \p len bytes of the file associated
/// with \p this. These bytes are returned as the "magic number" in the
/// \p Magic parameter.
/// @returns true if the Path is a file and the magic number is retrieved,
/// false otherwise.
/// @brief Get the file's magic number.
bool getMagicNumber(std::string& Magic, unsigned len) const;
/// This function determines if the path name in the object references an
/// archive file by looking at its magic number.
/// @returns true if the file starts with the magic number for an archive
/// file.
/// @brief Determine if the path references an archive file.
bool isArchive() const;
/// This function determines if the path name in the object references an
/// LLVM Bitcode file by looking at its magic number.
/// @returns true if the file starts with the magic number for LLVM
/// bitcode files.
/// @brief Determine if the path references a bitcode file.
bool isBitcodeFile() const;
/// This function determines if the path name in the object references a
/// native Dynamic Library (shared library, shared object) by looking at
/// the file's magic number. The Path object must reference a file, not a
/// directory.
/// @returns true if the file starts with the magic number for a native
/// shared library.
/// @brief Determine if the path references a dynamic library.
bool isDynamicLibrary() const;
/// This function determines if the path name in the object references a
/// native object file by looking at it's magic number. The term object
/// file is defined as "an organized collection of separate, named
/// sequences of binary data." This covers the obvious file formats such
/// as COFF and ELF, but it also includes llvm ir bitcode, archives,
/// libraries, etc...
/// @returns true if the file starts with the magic number for an object
/// file.
/// @brief Determine if the path references an object file.
bool isObjectFile() const;
/// This function determines if the path name references an existing file
/// or directory in the file system.
/// @returns true if the pathname references an existing file or
/// directory.
/// @brief Determines if the path is a file or directory in
/// the file system.
bool exists() const;
/// This function determines if the path name references an
/// existing directory.
/// @returns true if the pathname references an existing directory.
/// @brief Determines if the path is a directory in the file system.
bool isDirectory() const;
/// This function determines if the path name references an
/// existing symbolic link.
/// @returns true if the pathname references an existing symlink.
/// @brief Determines if the path is a symlink in the file system.
bool isSymLink() const;
/// This function determines if the path name references a readable file
/// or directory in the file system. This function checks for
/// the existence and readability (by the current program) of the file
/// or directory.
/// @returns true if the pathname references a readable file.
/// @brief Determines if the path is a readable file or directory
/// in the file system.
bool canRead() const;
/// This function determines if the path name references a writable file
/// or directory in the file system. This function checks for the
/// existence and writability (by the current program) of the file or
/// directory.
/// @returns true if the pathname references a writable file.
/// @brief Determines if the path is a writable file or directory
/// in the file system.
bool canWrite() const;
/// This function checks that what we're trying to work only on a regular
/// file. Check for things like /dev/null, any block special file, or
/// other things that aren't "regular" regular files.
/// @returns true if the file is S_ISREG.
/// @brief Determines if the file is a regular file
bool isRegularFile() const;
/// This function determines if the path name references an executable
/// file in the file system. This function checks for the existence and
/// executability (by the current program) of the file.
/// @returns true if the pathname references an executable file.
/// @brief Determines if the path is an executable file in the file
/// system.
bool canExecute() const;
/// This function builds a list of paths that are the names of the
/// files and directories in a directory.
/// @returns true if an error occurs, true otherwise
/// @brief Build a list of directory's contents.
bool getDirectoryContents(
std::set<Path> &paths, ///< The resulting list of file & directory names
std::string* ErrMsg ///< Optional place to return an error message.
) const;
/// @}
/// @name Path Mutators
/// @{
public:
/// The path name is cleared and becomes empty. This is an invalid
/// path name but is the *only* invalid path name. This is provided
/// so that path objects can be used to indicate the lack of a
/// valid path being found.
/// @brief Make the path empty.
void clear() { path.clear(); }
/// This method sets the Path object to \p unverified_path. This can fail
/// if the \p unverified_path does not pass the syntactic checks of the
/// isValid() method. If verification fails, the Path object remains
/// unchanged and false is returned. Otherwise true is returned and the
/// Path object takes on the path value of \p unverified_path
/// @returns true if the path was set, false otherwise.
/// @param unverified_path The path to be set in Path object.
/// @brief Set a full path from a StringRef
bool set(StringRef unverified_path);
/// One path component is removed from the Path. If only one component is
/// present in the path, the Path object becomes empty. If the Path object
/// is empty, no change is made.
/// @returns false if the path component could not be removed.
/// @brief Removes the last directory component of the Path.
bool eraseComponent();
/// The \p component is added to the end of the Path if it is a legal
/// name for the operating system. A directory separator will be added if
/// needed.
/// @returns false if the path component could not be added.
/// @brief Appends one path component to the Path.
bool appendComponent(StringRef component);
/// A period and the \p suffix are appended to the end of the pathname.
/// When the \p suffix is empty, no action is performed.
/// @brief Adds a period and the \p suffix to the end of the pathname.
void appendSuffix(StringRef suffix);
/// The suffix of the filename is erased. The suffix begins with and
/// includes the last . character in the filename after the last directory
/// separator and extends until the end of the name. If no . character is
/// after the last directory separator, then the file name is left
/// unchanged (i.e. it was already without a suffix) but the function
/// returns false.
/// @returns false if there was no suffix to remove, true otherwise.
/// @brief Remove the suffix from a path name.
bool eraseSuffix();
/// The current Path name is made unique in the file system. Upon return,
/// the Path will have been changed to make a unique file in the file
/// system or it will not have been changed if the current path name is
/// already unique.
/// @throws std::string if an unrecoverable error occurs.
/// @brief Make the current path name unique in the file system.
bool makeUnique( bool reuse_current /*= true*/, std::string* ErrMsg );
/// The current Path name is made absolute by prepending the
/// current working directory if necessary.
void makeAbsolute();
/// @}
/// @name Disk Mutators
/// @{
public:
/// This method attempts to make the file referenced by the Path object
/// available for reading so that the canRead() method will return true.
/// @brief Make the file readable;
bool makeReadableOnDisk(std::string* ErrMsg = 0);
/// This method attempts to make the file referenced by the Path object
/// available for writing so that the canWrite() method will return true.
/// @brief Make the file writable;
bool makeWriteableOnDisk(std::string* ErrMsg = 0);
/// This method attempts to make the file referenced by the Path object
/// available for execution so that the canExecute() method will return
/// true.
/// @brief Make the file readable;
bool makeExecutableOnDisk(std::string* ErrMsg = 0);
/// This method allows the last modified time stamp and permission bits
/// to be set on the disk object referenced by the Path.
/// @throws std::string if an error occurs.
/// @returns true on error.
/// @brief Set the status information.
bool setStatusInfoOnDisk(const FileStatus &SI,
std::string *ErrStr = 0) const;
/// This method attempts to create a directory in the file system with the
/// same name as the Path object. The \p create_parents parameter controls
/// whether intermediate directories are created or not. if \p
/// create_parents is true, then an attempt will be made to create all
/// intermediate directories, as needed. If \p create_parents is false,
/// then only the final directory component of the Path name will be
/// created. The created directory will have no entries.
/// @returns true if the directory could not be created, false otherwise
/// @brief Create the directory this Path refers to.
bool createDirectoryOnDisk(
bool create_parents = false, ///< Determines whether non-existent
///< directory components other than the last one (the "parents")
///< are created or not.
std::string* ErrMsg = 0 ///< Optional place to put error messages.
);
/// This method attempts to create a file in the file system with the same
/// name as the Path object. The intermediate directories must all exist
/// at the time this method is called. Use createDirectoriesOnDisk to
/// accomplish that. The created file will be empty upon return from this
/// function.
/// @returns true if the file could not be created, false otherwise.
/// @brief Create the file this Path refers to.
bool createFileOnDisk(
std::string* ErrMsg = 0 ///< Optional place to put error messages.
);
/// This is like createFile except that it creates a temporary file. A
/// unique temporary file name is generated based on the contents of
/// \p this before the call. The new name is assigned to \p this and the
/// file is created. Note that this will both change the Path object
/// *and* create the corresponding file. This function will ensure that
/// the newly generated temporary file name is unique in the file system.
/// @returns true if the file couldn't be created, false otherwise.
/// @brief Create a unique temporary file
bool createTemporaryFileOnDisk(
bool reuse_current = false, ///< When set to true, this parameter
///< indicates that if the current file name does not exist then
///< it will be used without modification.
std::string* ErrMsg = 0 ///< Optional place to put error messages
);
/// This method renames the file referenced by \p this as \p newName. The
/// file referenced by \p this must exist. The file referenced by
/// \p newName does not need to exist.
/// @returns true on error, false otherwise
/// @brief Rename one file as another.
bool renamePathOnDisk(const Path& newName, std::string* ErrMsg);
/// This method attempts to destroy the file or directory named by the
/// last component of the Path. If the Path refers to a directory and the
/// \p destroy_contents is false, an attempt will be made to remove just
/// the directory (the final Path component). If \p destroy_contents is
/// true, an attempt will be made to remove the entire contents of the
/// directory, recursively. If the Path refers to a file, the
/// \p destroy_contents parameter is ignored.
/// @param destroy_contents Indicates whether the contents of a destroyed
/// @param Err An optional string to receive an error message.
/// directory should also be destroyed (recursively).
/// @returns false if the file/directory was destroyed, true on error.
/// @brief Removes the file or directory from the filesystem.
bool eraseFromDisk(bool destroy_contents = false,
std::string *Err = 0) const;
/// MapInFilePages - This is a low level system API to map in the file
/// that is currently opened as FD into the current processes' address
/// space for read only access. This function may return null on failure
/// or if the system cannot provide the following constraints:
/// 1) The pages must be valid after the FD is closed, until
/// UnMapFilePages is called.
/// 2) Any padding after the end of the file must be zero filled, if
/// present.
/// 3) The pages must be contiguous.
///
/// This API is not intended for general use, clients should use
/// MemoryBuffer::getFile instead.
static const char *MapInFilePages(int FD, uint64_t FileSize);
/// UnMapFilePages - Free pages mapped into the current process by
/// MapInFilePages.
///
/// This API is not intended for general use, clients should use
/// MemoryBuffer::getFile instead.
static void UnMapFilePages(const char *Base, uint64_t FileSize);
/// @}
/// @name Data
/// @{
protected:
// Our win32 implementation relies on this string being mutable.
mutable std::string path; ///< Storage for the path name.
/// @}
};
/// This class is identical to Path class except it allows you to obtain the
/// file status of the Path as well. The reason for the distinction is one of
/// efficiency. First, the file status requires additional space and the space
/// is incorporated directly into PathWithStatus without an additional malloc.
/// Second, obtaining status information is an expensive operation on most
/// operating systems so we want to be careful and explicity about where we
/// allow this operation in LLVM.
/// @brief Path with file status class.
class PathWithStatus : public Path {
/// @name Constructors
/// @{
public:
/// @brief Default constructor
PathWithStatus() : Path(), status(), fsIsValid(false) {}
/// @brief Copy constructor
PathWithStatus(const PathWithStatus &that)
: Path(static_cast<const Path&>(that)), status(that.status),
fsIsValid(that.fsIsValid) {}
/// This constructor allows construction from a Path object
/// @brief Path constructor
PathWithStatus(const Path &other)
: Path(other), status(), fsIsValid(false) {}
/// This constructor will accept a char* or std::string as a path. No
/// checking is done on this path to determine if it is valid. To
/// determine validity of the path, use the isValid method.
/// @brief Construct a Path from a string.
explicit PathWithStatus(
StringRef p ///< The path to assign.
) : Path(p), status(), fsIsValid(false) {}
/// This constructor will accept a character range as a path. No checking
/// is done on this path to determine if it is valid. To determine
/// validity of the path, use the isValid method.
/// @brief Construct a Path from a string.
explicit PathWithStatus(
const char *StrStart, ///< Pointer to the first character of the path
unsigned StrLen ///< Length of the path.
) : Path(StrStart, StrLen), status(), fsIsValid(false) {}
/// Makes a copy of \p that to \p this.
/// @returns \p this
/// @brief Assignment Operator
PathWithStatus &operator=(const PathWithStatus &that) {
static_cast<Path&>(*this) = static_cast<const Path&>(that);
status = that.status;
fsIsValid = that.fsIsValid;
return *this;
}
/// Makes a copy of \p that to \p this.
/// @returns \p this
/// @brief Assignment Operator
PathWithStatus &operator=(const Path &that) {
static_cast<Path&>(*this) = static_cast<const Path&>(that);
fsIsValid = false;
return *this;
}
/// @}
/// @name Methods
/// @{
public:
/// This function returns status information about the file. The type of
/// path (file or directory) is updated to reflect the actual contents
/// of the file system.
/// @returns 0 on failure, with Error explaining why (if non-zero)
/// @returns a pointer to a FileStatus structure on success.
/// @brief Get file status.
const FileStatus *getFileStatus(
bool forceUpdate = false, ///< Force an update from the file system
std::string *Error = 0 ///< Optional place to return an error msg.
) const;
/// @}
/// @name Data
/// @{
private:
mutable FileStatus status; ///< Status information.
mutable bool fsIsValid; ///< Whether we've obtained it or not
/// @}
};
/// This enumeration delineates the kinds of files that LLVM knows about.
enum LLVMFileType {
Unknown_FileType = 0, ///< Unrecognized file
Bitcode_FileType, ///< Bitcode file
Archive_FileType, ///< ar style archive file
ELF_Relocatable_FileType, ///< ELF Relocatable object file
ELF_Executable_FileType, ///< ELF Executable image
ELF_SharedObject_FileType, ///< ELF dynamically linked shared lib
ELF_Core_FileType, ///< ELF core image
Mach_O_Object_FileType, ///< Mach-O Object file
Mach_O_Executable_FileType, ///< Mach-O Executable
Mach_O_FixedVirtualMemorySharedLib_FileType, ///< Mach-O Shared Lib, FVM
Mach_O_Core_FileType, ///< Mach-O Core File
Mach_O_PreloadExecutable_FileType, ///< Mach-O Preloaded Executable
Mach_O_DynamicallyLinkedSharedLib_FileType, ///< Mach-O dynlinked shared lib
Mach_O_DynamicLinker_FileType, ///< The Mach-O dynamic linker
Mach_O_Bundle_FileType, ///< Mach-O Bundle file
Mach_O_DynamicallyLinkedSharedLibStub_FileType, ///< Mach-O Shared lib stub
COFF_FileType ///< COFF object file or lib
};
/// This utility function allows any memory block to be examined in order
/// to determine its file type.
LLVMFileType IdentifyFileType(const char*magic, unsigned length);
/// This function can be used to copy the file specified by Src to the
/// file specified by Dest. If an error occurs, Dest is removed.
/// @returns true if an error occurs, false otherwise
/// @brief Copy one file to another.
bool CopyFile(const Path& Dest, const Path& Src, std::string* ErrMsg);
/// This is the OS-specific path separator: a colon on Unix or a semicolon
/// on Windows.
extern const char PathSeparator;
}
}
#endif
#include "llvm/Support/PathV1.h"
#include "llvm/Support/PathV2.h"

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//===- llvm/Support/PathV1.h - Path Operating System Concept ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the llvm::sys::Path class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SYSTEM_PATH_H
#define LLVM_SYSTEM_PATH_H
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/TimeValue.h"
#include <set>
#include <string>
#include <vector>
namespace llvm {
namespace sys {
/// This structure provides basic file system information about a file. It
/// is patterned after the stat(2) Unix operating system call but made
/// platform independent and eliminates many of the unix-specific fields.
/// However, to support llvm-ar, the mode, user, and group fields are
/// retained. These pertain to unix security and may not have a meaningful
/// value on non-Unix platforms. However, the other fields should
/// always be applicable on all platforms. The structure is filled in by
/// the PathWithStatus class.
/// @brief File status structure
class FileStatus {
public:
uint64_t fileSize; ///< Size of the file in bytes
TimeValue modTime; ///< Time of file's modification
uint32_t mode; ///< Mode of the file, if applicable
uint32_t user; ///< User ID of owner, if applicable
uint32_t group; ///< Group ID of owner, if applicable
uint64_t uniqueID; ///< A number to uniquely ID this file
bool isDir : 1; ///< True if this is a directory.
bool isFile : 1; ///< True if this is a file.
FileStatus() : fileSize(0), modTime(0,0), mode(0777), user(999),
group(999), uniqueID(0), isDir(false), isFile(false) { }
TimeValue getTimestamp() const { return modTime; }
uint64_t getSize() const { return fileSize; }
uint32_t getMode() const { return mode; }
uint32_t getUser() const { return user; }
uint32_t getGroup() const { return group; }
uint64_t getUniqueID() const { return uniqueID; }
};
/// This class provides an abstraction for the path to a file or directory
/// in the operating system's filesystem and provides various basic operations
/// on it. Note that this class only represents the name of a path to a file
/// or directory which may or may not be valid for a given machine's file
/// system. The class is patterned after the java.io.File class with various
/// extensions and several omissions (not relevant to LLVM). A Path object
/// ensures that the path it encapsulates is syntactically valid for the
/// operating system it is running on but does not ensure correctness for
/// any particular file system. That is, a syntactically valid path might
/// specify path components that do not exist in the file system and using
/// such a Path to act on the file system could produce errors. There is one
/// invalid Path value which is permitted: the empty path. The class should
/// never allow a syntactically invalid non-empty path name to be assigned.
/// Empty paths are required in order to indicate an error result in some
/// situations. If the path is empty, the isValid operation will return
/// false. All operations will fail if isValid is false. Operations that
/// change the path will either return false if it would cause a syntactically
/// invalid path name (in which case the Path object is left unchanged) or
/// throw an std::string exception indicating the error. The methods are
/// grouped into four basic categories: Path Accessors (provide information
/// about the path without accessing disk), Disk Accessors (provide
/// information about the underlying file or directory), Path Mutators
/// (change the path information, not the disk), and Disk Mutators (change
/// the disk file/directory referenced by the path). The Disk Mutator methods
/// all have the word "disk" embedded in their method name to reinforce the
/// notion that the operation modifies the file system.
/// @since 1.4
/// @brief An abstraction for operating system paths.
class Path {
/// @name Constructors
/// @{
public:
/// Construct a path to the root directory of the file system. The root
/// directory is a top level directory above which there are no more
/// directories. For example, on UNIX, the root directory is /. On Windows
/// it is file:///. Other operating systems may have different notions of
/// what the root directory is or none at all. In that case, a consistent
/// default root directory will be used.
static Path GetRootDirectory();
/// Construct a path to a unique temporary directory that is created in
/// a "standard" place for the operating system. The directory is
/// guaranteed to be created on exit from this function. If the directory
/// cannot be created, the function will throw an exception.
/// @returns an invalid path (empty) on error
/// @param ErrMsg Optional place for an error message if an error occurs
/// @brief Constrct a path to an new, unique, existing temporary
/// directory.
static Path GetTemporaryDirectory(std::string* ErrMsg = 0);
/// Construct a vector of sys::Path that contains the "standard" system
/// library paths suitable for linking into programs.
/// @brief Construct a path to the system library directory
static void GetSystemLibraryPaths(std::vector<sys::Path>& Paths);
/// Construct a vector of sys::Path that contains the "standard" bitcode
/// library paths suitable for linking into an llvm program. This function
/// *must* return the value of LLVM_LIB_SEARCH_PATH as well as the value
/// of LLVM_LIBDIR. It also must provide the System library paths as
/// returned by GetSystemLibraryPaths.
/// @see GetSystemLibraryPaths
/// @brief Construct a list of directories in which bitcode could be
/// found.
static void GetBitcodeLibraryPaths(std::vector<sys::Path>& Paths);
/// Find the path to a library using its short name. Use the system
/// dependent library paths to locate the library.
/// @brief Find a library.
static Path FindLibrary(std::string& short_name);
/// Construct a path to the default LLVM configuration directory. The
/// implementation must ensure that this is a well-known (same on many
/// systems) directory in which llvm configuration files exist. For
/// example, on Unix, the /etc/llvm directory has been selected.
/// @brief Construct a path to the default LLVM configuration directory
static Path GetLLVMDefaultConfigDir();
/// Construct a path to the LLVM installed configuration directory. The
/// implementation must ensure that this refers to the "etc" directory of
/// the LLVM installation. This is the location where configuration files
/// will be located for a particular installation of LLVM on a machine.
/// @brief Construct a path to the LLVM installed configuration directory
static Path GetLLVMConfigDir();
/// Construct a path to the current user's home directory. The
/// implementation must use an operating system specific mechanism for
/// determining the user's home directory. For example, the environment
/// variable "HOME" could be used on Unix. If a given operating system
/// does not have the concept of a user's home directory, this static
/// constructor must provide the same result as GetRootDirectory.
/// @brief Construct a path to the current user's "home" directory
static Path GetUserHomeDirectory();
/// Construct a path to the current directory for the current process.
/// @returns The current working directory.
/// @brief Returns the current working directory.
static Path GetCurrentDirectory();
/// Return the suffix commonly used on file names that contain an
/// executable.
/// @returns The executable file suffix for the current platform.
/// @brief Return the executable file suffix.
static StringRef GetEXESuffix();
/// Return the suffix commonly used on file names that contain a shared
/// object, shared archive, or dynamic link library. Such files are
/// linked at runtime into a process and their code images are shared
/// between processes.
/// @returns The dynamic link library suffix for the current platform.
/// @brief Return the dynamic link library suffix.
static StringRef GetDLLSuffix();
/// GetMainExecutable - Return the path to the main executable, given the
/// value of argv[0] from program startup and the address of main itself.
/// In extremis, this function may fail and return an empty path.
static Path GetMainExecutable(const char *argv0, void *MainAddr);
/// This is one of the very few ways in which a path can be constructed
/// with a syntactically invalid name. The only *legal* invalid name is an
/// empty one. Other invalid names are not permitted. Empty paths are
/// provided so that they can be used to indicate null or error results in
/// other lib/System functionality.
/// @brief Construct an empty (and invalid) path.
Path() : path() {}
Path(const Path &that) : path(that.path) {}
/// This constructor will accept a char* or std::string as a path. No
/// checking is done on this path to determine if it is valid. To
/// determine validity of the path, use the isValid method.
/// @param p The path to assign.
/// @brief Construct a Path from a string.
explicit Path(StringRef p);
/// This constructor will accept a character range as a path. No checking
/// is done on this path to determine if it is valid. To determine
/// validity of the path, use the isValid method.
/// @param StrStart A pointer to the first character of the path name
/// @param StrLen The length of the path name at StrStart
/// @brief Construct a Path from a string.
Path(const char *StrStart, unsigned StrLen);
/// @}
/// @name Operators
/// @{
public:
/// Makes a copy of \p that to \p this.
/// @returns \p this
/// @brief Assignment Operator
Path &operator=(const Path &that) {
path = that.path;
return *this;
}
/// Makes a copy of \p that to \p this.
/// @param that A StringRef denoting the path
/// @returns \p this
/// @brief Assignment Operator
Path &operator=(StringRef that);
/// Compares \p this Path with \p that Path for equality.
/// @returns true if \p this and \p that refer to the same thing.
/// @brief Equality Operator
bool operator==(const Path &that) const;
/// Compares \p this Path with \p that Path for inequality.
/// @returns true if \p this and \p that refer to different things.
/// @brief Inequality Operator
bool operator!=(const Path &that) const { return !(*this == that); }
/// Determines if \p this Path is less than \p that Path. This is required
/// so that Path objects can be placed into ordered collections (e.g.
/// std::map). The comparison is done lexicographically as defined by
/// the std::string::compare method.
/// @returns true if \p this path is lexicographically less than \p that.
/// @brief Less Than Operator
bool operator<(const Path& that) const;
/// @}
/// @name Path Accessors
/// @{
public:
/// This function will use an operating system specific algorithm to
/// determine if the current value of \p this is a syntactically valid
/// path name for the operating system. The path name does not need to
/// exist, validity is simply syntactical. Empty paths are always invalid.
/// @returns true iff the path name is syntactically legal for the
/// host operating system.
/// @brief Determine if a path is syntactically valid or not.
bool isValid() const;
/// This function determines if the contents of the path name are empty.
/// That is, the path name has a zero length. This does NOT determine if
/// if the file is empty. To get the length of the file itself, Use the
/// PathWithStatus::getFileStatus() method and then the getSize() method
/// on the returned FileStatus object.
/// @returns true iff the path is empty.
/// @brief Determines if the path name is empty (invalid).
bool isEmpty() const { return path.empty(); }
/// This function returns the last component of the path name. The last
/// component is the file or directory name occuring after the last
/// directory separator. If no directory separator is present, the entire
/// path name is returned (i.e. same as toString).
/// @returns StringRef containing the last component of the path name.
/// @brief Returns the last component of the path name.
StringRef getLast() const;
/// This function strips off the path and suffix of the file or directory
/// name and returns just the basename. For example /a/foo.bar would cause
/// this function to return "foo".
/// @returns StringRef containing the basename of the path
/// @brief Get the base name of the path
StringRef getBasename() const;
/// This function strips off the suffix of the path beginning with the
/// path separator ('/' on Unix, '\' on Windows) and returns the result.
StringRef getDirname() const;
/// This function strips off the path and basename(up to and
/// including the last dot) of the file or directory name and
/// returns just the suffix. For example /a/foo.bar would cause
/// this function to return "bar".
/// @returns StringRef containing the suffix of the path
/// @brief Get the suffix of the path
StringRef getSuffix() const;
/// Obtain a 'C' string for the path name.
/// @returns a 'C' string containing the path name.
/// @brief Returns the path as a C string.
const char *c_str() const { return path.c_str(); }
const std::string &str() const { return path; }
/// size - Return the length in bytes of this path name.
size_t size() const { return path.size(); }
/// empty - Returns true if the path is empty.
unsigned empty() const { return path.empty(); }
/// @}
/// @name Disk Accessors
/// @{
public:
/// This function determines if the path name is absolute, as opposed to
/// relative.
/// @brief Determine if the path is absolute.
bool isAbsolute() const;
/// This function determines if the path name is absolute, as opposed to
/// relative.
/// @brief Determine if the path is absolute.
static bool isAbsolute(const char *NameStart, unsigned NameLen);
/// This function opens the file associated with the path name provided by
/// the Path object and reads its magic number. If the magic number at the
/// start of the file matches \p magic, true is returned. In all other
/// cases (file not found, file not accessible, etc.) it returns false.
/// @returns true if the magic number of the file matches \p magic.
/// @brief Determine if file has a specific magic number
bool hasMagicNumber(StringRef magic) const;
/// This function retrieves the first \p len bytes of the file associated
/// with \p this. These bytes are returned as the "magic number" in the
/// \p Magic parameter.
/// @returns true if the Path is a file and the magic number is retrieved,
/// false otherwise.
/// @brief Get the file's magic number.
bool getMagicNumber(std::string& Magic, unsigned len) const;
/// This function determines if the path name in the object references an
/// archive file by looking at its magic number.
/// @returns true if the file starts with the magic number for an archive
/// file.
/// @brief Determine if the path references an archive file.
bool isArchive() const;
/// This function determines if the path name in the object references an
/// LLVM Bitcode file by looking at its magic number.
/// @returns true if the file starts with the magic number for LLVM
/// bitcode files.
/// @brief Determine if the path references a bitcode file.
bool isBitcodeFile() const;
/// This function determines if the path name in the object references a
/// native Dynamic Library (shared library, shared object) by looking at
/// the file's magic number. The Path object must reference a file, not a
/// directory.
/// @returns true if the file starts with the magic number for a native
/// shared library.
/// @brief Determine if the path references a dynamic library.
bool isDynamicLibrary() const;
/// This function determines if the path name in the object references a
/// native object file by looking at it's magic number. The term object
/// file is defined as "an organized collection of separate, named
/// sequences of binary data." This covers the obvious file formats such
/// as COFF and ELF, but it also includes llvm ir bitcode, archives,
/// libraries, etc...
/// @returns true if the file starts with the magic number for an object
/// file.
/// @brief Determine if the path references an object file.
bool isObjectFile() const;
/// This function determines if the path name references an existing file
/// or directory in the file system.
/// @returns true if the pathname references an existing file or
/// directory.
/// @brief Determines if the path is a file or directory in
/// the file system.
bool exists() const;
/// This function determines if the path name references an
/// existing directory.
/// @returns true if the pathname references an existing directory.
/// @brief Determines if the path is a directory in the file system.
bool isDirectory() const;
/// This function determines if the path name references an
/// existing symbolic link.
/// @returns true if the pathname references an existing symlink.
/// @brief Determines if the path is a symlink in the file system.
bool isSymLink() const;
/// This function determines if the path name references a readable file
/// or directory in the file system. This function checks for
/// the existence and readability (by the current program) of the file
/// or directory.
/// @returns true if the pathname references a readable file.
/// @brief Determines if the path is a readable file or directory
/// in the file system.
bool canRead() const;
/// This function determines if the path name references a writable file
/// or directory in the file system. This function checks for the
/// existence and writability (by the current program) of the file or
/// directory.
/// @returns true if the pathname references a writable file.
/// @brief Determines if the path is a writable file or directory
/// in the file system.
bool canWrite() const;
/// This function checks that what we're trying to work only on a regular
/// file. Check for things like /dev/null, any block special file, or
/// other things that aren't "regular" regular files.
/// @returns true if the file is S_ISREG.
/// @brief Determines if the file is a regular file
bool isRegularFile() const;
/// This function determines if the path name references an executable
/// file in the file system. This function checks for the existence and
/// executability (by the current program) of the file.
/// @returns true if the pathname references an executable file.
/// @brief Determines if the path is an executable file in the file
/// system.
bool canExecute() const;
/// This function builds a list of paths that are the names of the
/// files and directories in a directory.
/// @returns true if an error occurs, true otherwise
/// @brief Build a list of directory's contents.
bool getDirectoryContents(
std::set<Path> &paths, ///< The resulting list of file & directory names
std::string* ErrMsg ///< Optional place to return an error message.
) const;
/// @}
/// @name Path Mutators
/// @{
public:
/// The path name is cleared and becomes empty. This is an invalid
/// path name but is the *only* invalid path name. This is provided
/// so that path objects can be used to indicate the lack of a
/// valid path being found.
/// @brief Make the path empty.
void clear() { path.clear(); }
/// This method sets the Path object to \p unverified_path. This can fail
/// if the \p unverified_path does not pass the syntactic checks of the
/// isValid() method. If verification fails, the Path object remains
/// unchanged and false is returned. Otherwise true is returned and the
/// Path object takes on the path value of \p unverified_path
/// @returns true if the path was set, false otherwise.
/// @param unverified_path The path to be set in Path object.
/// @brief Set a full path from a StringRef
bool set(StringRef unverified_path);
/// One path component is removed from the Path. If only one component is
/// present in the path, the Path object becomes empty. If the Path object
/// is empty, no change is made.
/// @returns false if the path component could not be removed.
/// @brief Removes the last directory component of the Path.
bool eraseComponent();
/// The \p component is added to the end of the Path if it is a legal
/// name for the operating system. A directory separator will be added if
/// needed.
/// @returns false if the path component could not be added.
/// @brief Appends one path component to the Path.
bool appendComponent(StringRef component);
/// A period and the \p suffix are appended to the end of the pathname.
/// When the \p suffix is empty, no action is performed.
/// @brief Adds a period and the \p suffix to the end of the pathname.
void appendSuffix(StringRef suffix);
/// The suffix of the filename is erased. The suffix begins with and
/// includes the last . character in the filename after the last directory
/// separator and extends until the end of the name. If no . character is
/// after the last directory separator, then the file name is left
/// unchanged (i.e. it was already without a suffix) but the function
/// returns false.
/// @returns false if there was no suffix to remove, true otherwise.
/// @brief Remove the suffix from a path name.
bool eraseSuffix();
/// The current Path name is made unique in the file system. Upon return,
/// the Path will have been changed to make a unique file in the file
/// system or it will not have been changed if the current path name is
/// already unique.
/// @throws std::string if an unrecoverable error occurs.
/// @brief Make the current path name unique in the file system.
bool makeUnique( bool reuse_current /*= true*/, std::string* ErrMsg );
/// The current Path name is made absolute by prepending the
/// current working directory if necessary.
void makeAbsolute();
/// @}
/// @name Disk Mutators
/// @{
public:
/// This method attempts to make the file referenced by the Path object
/// available for reading so that the canRead() method will return true.
/// @brief Make the file readable;
bool makeReadableOnDisk(std::string* ErrMsg = 0);
/// This method attempts to make the file referenced by the Path object
/// available for writing so that the canWrite() method will return true.
/// @brief Make the file writable;
bool makeWriteableOnDisk(std::string* ErrMsg = 0);
/// This method attempts to make the file referenced by the Path object
/// available for execution so that the canExecute() method will return
/// true.
/// @brief Make the file readable;
bool makeExecutableOnDisk(std::string* ErrMsg = 0);
/// This method allows the last modified time stamp and permission bits
/// to be set on the disk object referenced by the Path.
/// @throws std::string if an error occurs.
/// @returns true on error.
/// @brief Set the status information.
bool setStatusInfoOnDisk(const FileStatus &SI,
std::string *ErrStr = 0) const;
/// This method attempts to create a directory in the file system with the
/// same name as the Path object. The \p create_parents parameter controls
/// whether intermediate directories are created or not. if \p
/// create_parents is true, then an attempt will be made to create all
/// intermediate directories, as needed. If \p create_parents is false,
/// then only the final directory component of the Path name will be
/// created. The created directory will have no entries.
/// @returns true if the directory could not be created, false otherwise
/// @brief Create the directory this Path refers to.
bool createDirectoryOnDisk(
bool create_parents = false, ///< Determines whether non-existent
///< directory components other than the last one (the "parents")
///< are created or not.
std::string* ErrMsg = 0 ///< Optional place to put error messages.
);
/// This method attempts to create a file in the file system with the same
/// name as the Path object. The intermediate directories must all exist
/// at the time this method is called. Use createDirectoriesOnDisk to
/// accomplish that. The created file will be empty upon return from this
/// function.
/// @returns true if the file could not be created, false otherwise.
/// @brief Create the file this Path refers to.
bool createFileOnDisk(
std::string* ErrMsg = 0 ///< Optional place to put error messages.
);
/// This is like createFile except that it creates a temporary file. A
/// unique temporary file name is generated based on the contents of
/// \p this before the call. The new name is assigned to \p this and the
/// file is created. Note that this will both change the Path object
/// *and* create the corresponding file. This function will ensure that
/// the newly generated temporary file name is unique in the file system.
/// @returns true if the file couldn't be created, false otherwise.
/// @brief Create a unique temporary file
bool createTemporaryFileOnDisk(
bool reuse_current = false, ///< When set to true, this parameter
///< indicates that if the current file name does not exist then
///< it will be used without modification.
std::string* ErrMsg = 0 ///< Optional place to put error messages
);
/// This method renames the file referenced by \p this as \p newName. The
/// file referenced by \p this must exist. The file referenced by
/// \p newName does not need to exist.
/// @returns true on error, false otherwise
/// @brief Rename one file as another.
bool renamePathOnDisk(const Path& newName, std::string* ErrMsg);
/// This method attempts to destroy the file or directory named by the
/// last component of the Path. If the Path refers to a directory and the
/// \p destroy_contents is false, an attempt will be made to remove just
/// the directory (the final Path component). If \p destroy_contents is
/// true, an attempt will be made to remove the entire contents of the
/// directory, recursively. If the Path refers to a file, the
/// \p destroy_contents parameter is ignored.
/// @param destroy_contents Indicates whether the contents of a destroyed
/// @param Err An optional string to receive an error message.
/// directory should also be destroyed (recursively).
/// @returns false if the file/directory was destroyed, true on error.
/// @brief Removes the file or directory from the filesystem.
bool eraseFromDisk(bool destroy_contents = false,
std::string *Err = 0) const;
/// MapInFilePages - This is a low level system API to map in the file
/// that is currently opened as FD into the current processes' address
/// space for read only access. This function may return null on failure
/// or if the system cannot provide the following constraints:
/// 1) The pages must be valid after the FD is closed, until
/// UnMapFilePages is called.
/// 2) Any padding after the end of the file must be zero filled, if
/// present.
/// 3) The pages must be contiguous.
///
/// This API is not intended for general use, clients should use
/// MemoryBuffer::getFile instead.
static const char *MapInFilePages(int FD, uint64_t FileSize);
/// UnMapFilePages - Free pages mapped into the current process by
/// MapInFilePages.
///
/// This API is not intended for general use, clients should use
/// MemoryBuffer::getFile instead.
static void UnMapFilePages(const char *Base, uint64_t FileSize);
/// @}
/// @name Data
/// @{
protected:
// Our win32 implementation relies on this string being mutable.
mutable std::string path; ///< Storage for the path name.
/// @}
};
/// This class is identical to Path class except it allows you to obtain the
/// file status of the Path as well. The reason for the distinction is one of
/// efficiency. First, the file status requires additional space and the space
/// is incorporated directly into PathWithStatus without an additional malloc.
/// Second, obtaining status information is an expensive operation on most
/// operating systems so we want to be careful and explicity about where we
/// allow this operation in LLVM.
/// @brief Path with file status class.
class PathWithStatus : public Path {
/// @name Constructors
/// @{
public:
/// @brief Default constructor
PathWithStatus() : Path(), status(), fsIsValid(false) {}
/// @brief Copy constructor
PathWithStatus(const PathWithStatus &that)
: Path(static_cast<const Path&>(that)), status(that.status),
fsIsValid(that.fsIsValid) {}
/// This constructor allows construction from a Path object
/// @brief Path constructor
PathWithStatus(const Path &other)
: Path(other), status(), fsIsValid(false) {}
/// This constructor will accept a char* or std::string as a path. No
/// checking is done on this path to determine if it is valid. To
/// determine validity of the path, use the isValid method.
/// @brief Construct a Path from a string.
explicit PathWithStatus(
StringRef p ///< The path to assign.
) : Path(p), status(), fsIsValid(false) {}
/// This constructor will accept a character range as a path. No checking
/// is done on this path to determine if it is valid. To determine
/// validity of the path, use the isValid method.
/// @brief Construct a Path from a string.
explicit PathWithStatus(
const char *StrStart, ///< Pointer to the first character of the path
unsigned StrLen ///< Length of the path.
) : Path(StrStart, StrLen), status(), fsIsValid(false) {}
/// Makes a copy of \p that to \p this.
/// @returns \p this
/// @brief Assignment Operator
PathWithStatus &operator=(const PathWithStatus &that) {
static_cast<Path&>(*this) = static_cast<const Path&>(that);
status = that.status;
fsIsValid = that.fsIsValid;
return *this;
}
/// Makes a copy of \p that to \p this.
/// @returns \p this
/// @brief Assignment Operator
PathWithStatus &operator=(const Path &that) {
static_cast<Path&>(*this) = static_cast<const Path&>(that);
fsIsValid = false;
return *this;
}
/// @}
/// @name Methods
/// @{
public:
/// This function returns status information about the file. The type of
/// path (file or directory) is updated to reflect the actual contents
/// of the file system.
/// @returns 0 on failure, with Error explaining why (if non-zero)
/// @returns a pointer to a FileStatus structure on success.
/// @brief Get file status.
const FileStatus *getFileStatus(
bool forceUpdate = false, ///< Force an update from the file system
std::string *Error = 0 ///< Optional place to return an error msg.
) const;
/// @}
/// @name Data
/// @{
private:
mutable FileStatus status; ///< Status information.
mutable bool fsIsValid; ///< Whether we've obtained it or not
/// @}
};
/// This enumeration delineates the kinds of files that LLVM knows about.
enum LLVMFileType {
Unknown_FileType = 0, ///< Unrecognized file
Bitcode_FileType, ///< Bitcode file
Archive_FileType, ///< ar style archive file
ELF_Relocatable_FileType, ///< ELF Relocatable object file
ELF_Executable_FileType, ///< ELF Executable image
ELF_SharedObject_FileType, ///< ELF dynamically linked shared lib
ELF_Core_FileType, ///< ELF core image
Mach_O_Object_FileType, ///< Mach-O Object file
Mach_O_Executable_FileType, ///< Mach-O Executable
Mach_O_FixedVirtualMemorySharedLib_FileType, ///< Mach-O Shared Lib, FVM
Mach_O_Core_FileType, ///< Mach-O Core File
Mach_O_PreloadExecutable_FileType, ///< Mach-O Preloaded Executable
Mach_O_DynamicallyLinkedSharedLib_FileType, ///< Mach-O dynlinked shared lib
Mach_O_DynamicLinker_FileType, ///< The Mach-O dynamic linker
Mach_O_Bundle_FileType, ///< Mach-O Bundle file
Mach_O_DynamicallyLinkedSharedLibStub_FileType, ///< Mach-O Shared lib stub
COFF_FileType ///< COFF object file or lib
};
/// This utility function allows any memory block to be examined in order
/// to determine its file type.
LLVMFileType IdentifyFileType(const char*magic, unsigned length);
/// This function can be used to copy the file specified by Src to the
/// file specified by Dest. If an error occurs, Dest is removed.
/// @returns true if an error occurs, false otherwise
/// @brief Copy one file to another.
bool CopyFile(const Path& Dest, const Path& Src, std::string* ErrMsg);
/// This is the OS-specific path separator: a colon on Unix or a semicolon
/// on Windows.
extern const char PathSeparator;
}
}
#endif