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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184229 91177308-0d34-0410-b5e6-96231b3b80d8
547 lines
25 KiB
C++
547 lines
25 KiB
C++
//===- llvm/Support/PathV1.h - Path Operating System Concept ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::Path class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_PATHV1_H
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#define LLVM_SUPPORT_PATHV1_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/TimeValue.h"
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#include <set>
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#include <string>
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#include <vector>
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#define LLVM_PATH_DEPRECATED_MSG(replacement) \
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"PathV1 has been deprecated and will be removed as soon as all LLVM and" \
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" Clang clients have been moved over to PathV2. Please use `" #replacement \
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"` from PathV2 instead."
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namespace llvm {
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namespace sys {
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/// This structure provides basic file system information about a file. It
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/// is patterned after the stat(2) Unix operating system call but made
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/// platform independent and eliminates many of the unix-specific fields.
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/// However, to support llvm-ar, the mode, user, and group fields are
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/// retained. These pertain to unix security and may not have a meaningful
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/// value on non-Unix platforms. However, the other fields should
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/// always be applicable on all platforms. The structure is filled in by
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/// the PathWithStatus class.
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/// @brief File status structure
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class FileStatus {
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public:
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uint64_t fileSize; ///< Size of the file in bytes
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TimeValue modTime; ///< Time of file's modification
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uint32_t mode; ///< Mode of the file, if applicable
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uint32_t user; ///< User ID of owner, if applicable
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uint32_t group; ///< Group ID of owner, if applicable
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bool isDir : 1; ///< True if this is a directory.
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bool isFile : 1; ///< True if this is a file.
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FileStatus() : fileSize(0), modTime(0,0), mode(0777), user(999),
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group(999), isDir(false), isFile(false) { }
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TimeValue getTimestamp() const { return modTime; }
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uint64_t getSize() const { return fileSize; }
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uint32_t getMode() const { return mode; }
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uint32_t getUser() const { return user; }
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uint32_t getGroup() const { return group; }
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};
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/// This class provides an abstraction for the path to a file or directory
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/// in the operating system's filesystem and provides various basic operations
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/// on it. Note that this class only represents the name of a path to a file
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/// or directory which may or may not be valid for a given machine's file
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/// system. The class is patterned after the java.io.File class with various
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/// extensions and several omissions (not relevant to LLVM). A Path object
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/// ensures that the path it encapsulates is syntactically valid for the
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/// operating system it is running on but does not ensure correctness for
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/// any particular file system. That is, a syntactically valid path might
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/// specify path components that do not exist in the file system and using
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/// such a Path to act on the file system could produce errors. There is one
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/// invalid Path value which is permitted: the empty path. The class should
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/// never allow a syntactically invalid non-empty path name to be assigned.
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/// Empty paths are required in order to indicate an error result in some
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/// situations. If the path is empty, the isValid operation will return
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/// false. All operations will fail if isValid is false. Operations that
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/// change the path will either return false if it would cause a syntactically
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/// invalid path name (in which case the Path object is left unchanged) or
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/// throw an std::string exception indicating the error. The methods are
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/// grouped into four basic categories: Path Accessors (provide information
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/// about the path without accessing disk), Disk Accessors (provide
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/// information about the underlying file or directory), Path Mutators
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/// (change the path information, not the disk), and Disk Mutators (change
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/// the disk file/directory referenced by the path). The Disk Mutator methods
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/// all have the word "disk" embedded in their method name to reinforce the
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/// notion that the operation modifies the file system.
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/// @since 1.4
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/// @brief An abstraction for operating system paths.
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class Path {
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/// @name Constructors
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/// @{
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public:
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/// Construct a path to a unique temporary directory that is created in
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/// a "standard" place for the operating system. The directory is
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/// guaranteed to be created on exit from this function. If the directory
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/// cannot be created, the function will throw an exception.
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/// @returns an invalid path (empty) on error
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/// @param ErrMsg Optional place for an error message if an error occurs
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/// @brief Construct a path to an new, unique, existing temporary
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/// directory.
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static Path GetTemporaryDirectory(std::string* ErrMsg = 0);
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/// Construct a path to the current directory for the current process.
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/// @returns The current working directory.
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/// @brief Returns the current working directory.
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static Path GetCurrentDirectory();
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/// Return the suffix commonly used on file names that contain an
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/// executable.
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/// @returns The executable file suffix for the current platform.
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/// @brief Return the executable file suffix.
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static StringRef GetEXESuffix();
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/// GetMainExecutable - Return the path to the main executable, given the
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/// value of argv[0] from program startup and the address of main itself.
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/// In extremis, this function may fail and return an empty path.
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static Path GetMainExecutable(const char *argv0, void *MainAddr);
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/// This is one of the very few ways in which a path can be constructed
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/// with a syntactically invalid name. The only *legal* invalid name is an
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/// empty one. Other invalid names are not permitted. Empty paths are
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/// provided so that they can be used to indicate null or error results in
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/// other lib/System functionality.
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/// @brief Construct an empty (and invalid) path.
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Path() : path() {}
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Path(const Path &that) : path(that.path) {}
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/// This constructor will accept a char* or std::string as a path. No
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/// checking is done on this path to determine if it is valid. To
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/// determine validity of the path, use the isValid method.
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/// @param p The path to assign.
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/// @brief Construct a Path from a string.
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explicit Path(StringRef p);
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/// This constructor will accept a character range as a path. No checking
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/// is done on this path to determine if it is valid. To determine
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/// validity of the path, use the isValid method.
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/// @param StrStart A pointer to the first character of the path name
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/// @param StrLen The length of the path name at StrStart
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/// @brief Construct a Path from a string.
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Path(const char *StrStart, unsigned StrLen);
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/// @}
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/// @name Operators
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/// @{
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public:
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/// Makes a copy of \p that to \p this.
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/// @returns \p this
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/// @brief Assignment Operator
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Path &operator=(const Path &that) {
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path = that.path;
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return *this;
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}
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/// Makes a copy of \p that to \p this.
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/// @param that A StringRef denoting the path
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/// @returns \p this
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/// @brief Assignment Operator
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Path &operator=(StringRef that);
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/// Compares \p this Path with \p that Path for equality.
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/// @returns true if \p this and \p that refer to the same thing.
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/// @brief Equality Operator
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bool operator==(const Path &that) const;
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/// Compares \p this Path with \p that Path for inequality.
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/// @returns true if \p this and \p that refer to different things.
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/// @brief Inequality Operator
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bool operator!=(const Path &that) const { return !(*this == that); }
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/// Determines if \p this Path is less than \p that Path. This is required
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/// so that Path objects can be placed into ordered collections (e.g.
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/// std::map). The comparison is done lexicographically as defined by
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/// the std::string::compare method.
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/// @returns true if \p this path is lexicographically less than \p that.
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/// @brief Less Than Operator
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bool operator<(const Path& that) const;
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/// @}
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/// @name Path Accessors
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/// @{
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public:
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/// This function will use an operating system specific algorithm to
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/// determine if the current value of \p this is a syntactically valid
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/// path name for the operating system. The path name does not need to
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/// exist, validity is simply syntactical. Empty paths are always invalid.
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/// @returns true iff the path name is syntactically legal for the
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/// host operating system.
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/// @brief Determine if a path is syntactically valid or not.
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bool isValid() const;
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/// This function determines if the contents of the path name are empty.
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/// That is, the path name has a zero length. This does NOT determine if
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/// if the file is empty. To get the length of the file itself, Use the
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/// PathWithStatus::getFileStatus() method and then the getSize() method
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/// on the returned FileStatus object.
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/// @returns true iff the path is empty.
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/// @brief Determines if the path name is empty (invalid).
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bool isEmpty() const { return path.empty(); }
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/// Obtain a 'C' string for the path name.
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/// @returns a 'C' string containing the path name.
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/// @brief Returns the path as a C string.
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const char *c_str() const { return path.c_str(); }
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const std::string &str() const { return path; }
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/// size - Return the length in bytes of this path name.
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size_t size() const { return path.size(); }
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/// empty - Returns true if the path is empty.
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unsigned empty() const { return path.empty(); }
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/// @}
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/// @name Disk Accessors
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/// @{
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public:
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/// This function determines if the path name in the object references an
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/// archive file by looking at its magic number.
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/// @returns true if the file starts with the magic number for an archive
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/// file.
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/// @brief Determine if the path references an archive file.
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bool isArchive() const;
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/// This function determines if the path name in the object references a
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/// native Dynamic Library (shared library, shared object) by looking at
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/// the file's magic number. The Path object must reference a file, not a
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/// directory.
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/// @returns true if the file starts with the magic number for a native
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/// shared library.
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/// @brief Determine if the path references a dynamic library.
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bool isDynamicLibrary() const;
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/// This function determines if the path name in the object references a
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/// native object file by looking at it's magic number. The term object
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/// file is defined as "an organized collection of separate, named
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/// sequences of binary data." This covers the obvious file formats such
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/// as COFF and ELF, but it also includes llvm ir bitcode, archives,
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/// libraries, etc...
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/// @returns true if the file starts with the magic number for an object
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/// file.
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/// @brief Determine if the path references an object file.
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bool isObjectFile() const;
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/// This function determines if the path name references an existing file
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/// or directory in the file system.
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/// @returns true if the pathname references an existing file or
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/// directory.
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/// @brief Determines if the path is a file or directory in
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/// the file system.
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LLVM_ATTRIBUTE_DEPRECATED(bool exists() const,
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LLVM_PATH_DEPRECATED_MSG(fs::exists));
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/// This function determines if the path name references an
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/// existing directory.
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/// @returns true if the pathname references an existing directory.
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/// @brief Determines if the path is a directory in the file system.
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LLVM_ATTRIBUTE_DEPRECATED(bool isDirectory() const,
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LLVM_PATH_DEPRECATED_MSG(fs::is_directory));
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/// This function determines if the path name references an
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/// existing symbolic link.
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/// @returns true if the pathname references an existing symlink.
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/// @brief Determines if the path is a symlink in the file system.
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LLVM_ATTRIBUTE_DEPRECATED(bool isSymLink() const,
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LLVM_PATH_DEPRECATED_MSG(fs::is_symlink));
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/// This function determines if the path name references a writable file
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/// or directory in the file system. This function checks for the
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/// existence and writability (by the current program) of the file or
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/// directory.
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/// @returns true if the pathname references a writable file.
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/// @brief Determines if the path is a writable file or directory
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/// in the file system.
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bool canWrite() const;
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/// This function checks that what we're trying to work only on a regular
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/// file. Check for things like /dev/null, any block special file, or
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/// other things that aren't "regular" regular files.
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/// @returns true if the file is S_ISREG.
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/// @brief Determines if the file is a regular file
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bool isRegularFile() const;
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/// This function determines if the path name references an executable
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/// file in the file system. This function checks for the existence and
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/// executability (by the current program) of the file.
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/// @returns true if the pathname references an executable file.
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/// @brief Determines if the path is an executable file in the file
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/// system.
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bool canExecute() const;
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/// This function builds a list of paths that are the names of the
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/// files and directories in a directory.
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/// @returns true if an error occurs, true otherwise
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/// @brief Build a list of directory's contents.
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bool getDirectoryContents(
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std::set<Path> &paths, ///< The resulting list of file & directory names
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std::string* ErrMsg ///< Optional place to return an error message.
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) const;
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/// @}
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/// @name Path Mutators
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/// @{
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public:
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/// The path name is cleared and becomes empty. This is an invalid
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/// path name but is the *only* invalid path name. This is provided
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/// so that path objects can be used to indicate the lack of a
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/// valid path being found.
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/// @brief Make the path empty.
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void clear() { path.clear(); }
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/// This method sets the Path object to \p unverified_path. This can fail
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/// if the \p unverified_path does not pass the syntactic checks of the
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/// isValid() method. If verification fails, the Path object remains
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/// unchanged and false is returned. Otherwise true is returned and the
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/// Path object takes on the path value of \p unverified_path
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/// @returns true if the path was set, false otherwise.
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/// @param unverified_path The path to be set in Path object.
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/// @brief Set a full path from a StringRef
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bool set(StringRef unverified_path);
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/// One path component is removed from the Path. If only one component is
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/// present in the path, the Path object becomes empty. If the Path object
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/// is empty, no change is made.
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/// @returns false if the path component could not be removed.
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/// @brief Removes the last directory component of the Path.
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bool eraseComponent();
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/// The \p component is added to the end of the Path if it is a legal
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/// name for the operating system. A directory separator will be added if
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/// needed.
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/// @returns false if the path component could not be added.
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/// @brief Appends one path component to the Path.
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bool appendComponent(StringRef component);
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/// A period and the \p suffix are appended to the end of the pathname.
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/// When the \p suffix is empty, no action is performed.
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/// @brief Adds a period and the \p suffix to the end of the pathname.
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void appendSuffix(StringRef suffix);
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/// The suffix of the filename is erased. The suffix begins with and
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/// includes the last . character in the filename after the last directory
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/// separator and extends until the end of the name. If no . character is
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/// after the last directory separator, then the file name is left
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/// unchanged (i.e. it was already without a suffix) but the function
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/// returns false.
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/// @returns false if there was no suffix to remove, true otherwise.
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/// @brief Remove the suffix from a path name.
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bool eraseSuffix();
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/// The current Path name is made unique in the file system. Upon return,
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/// the Path will have been changed to make a unique file in the file
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/// system or it will not have been changed if the current path name is
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/// already unique.
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/// @throws std::string if an unrecoverable error occurs.
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/// @brief Make the current path name unique in the file system.
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bool makeUnique( bool reuse_current /*= true*/, std::string* ErrMsg );
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/// The current Path name is made absolute by prepending the
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/// current working directory if necessary.
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LLVM_ATTRIBUTE_DEPRECATED(
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void makeAbsolute(),
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LLVM_PATH_DEPRECATED_MSG(fs::make_absolute));
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/// @}
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/// @name Disk Mutators
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/// @{
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public:
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/// This method attempts to make the file referenced by the Path object
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/// available for reading so that the canRead() method will return true.
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/// @brief Make the file readable;
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bool makeReadableOnDisk(std::string* ErrMsg = 0);
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/// This method attempts to make the file referenced by the Path object
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/// available for writing so that the canWrite() method will return true.
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/// @brief Make the file writable;
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bool makeWriteableOnDisk(std::string* ErrMsg = 0);
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/// This method allows the last modified time stamp and permission bits
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/// to be set on the disk object referenced by the Path.
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/// @throws std::string if an error occurs.
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/// @returns true on error.
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/// @brief Set the status information.
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bool setStatusInfoOnDisk(const FileStatus &SI,
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std::string *ErrStr = 0) const;
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/// This method attempts to create a directory in the file system with the
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/// same name as the Path object. The \p create_parents parameter controls
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/// whether intermediate directories are created or not. if \p
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/// create_parents is true, then an attempt will be made to create all
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/// intermediate directories, as needed. If \p create_parents is false,
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/// then only the final directory component of the Path name will be
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/// created. The created directory will have no entries.
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/// @returns true if the directory could not be created, false otherwise
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/// @brief Create the directory this Path refers to.
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bool createDirectoryOnDisk(
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bool create_parents = false, ///< Determines whether non-existent
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///< directory components other than the last one (the "parents")
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///< are created or not.
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std::string* ErrMsg = 0 ///< Optional place to put error messages.
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);
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/// This is like createFile except that it creates a temporary file. A
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/// unique temporary file name is generated based on the contents of
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/// \p this before the call. The new name is assigned to \p this and the
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/// file is created. Note that this will both change the Path object
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/// *and* create the corresponding file. This function will ensure that
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/// the newly generated temporary file name is unique in the file system.
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/// @returns true if the file couldn't be created, false otherwise.
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/// @brief Create a unique temporary file
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bool createTemporaryFileOnDisk(
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bool reuse_current = false, ///< When set to true, this parameter
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///< indicates that if the current file name does not exist then
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///< it will be used without modification.
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std::string* ErrMsg = 0 ///< Optional place to put error messages
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);
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/// This method renames the file referenced by \p this as \p newName. The
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/// file referenced by \p this must exist. The file referenced by
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/// \p newName does not need to exist.
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/// @returns true on error, false otherwise
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/// @brief Rename one file as another.
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bool renamePathOnDisk(const Path& newName, std::string* ErrMsg);
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/// This method attempts to destroy the file or directory named by the
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/// last component of the Path. If the Path refers to a directory and the
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/// \p destroy_contents is false, an attempt will be made to remove just
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/// the directory (the final Path component). If \p destroy_contents is
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/// true, an attempt will be made to remove the entire contents of the
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/// directory, recursively. If the Path refers to a file, the
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/// \p destroy_contents parameter is ignored.
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/// @param destroy_contents Indicates whether the contents of a destroyed
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/// @param Err An optional string to receive an error message.
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/// directory should also be destroyed (recursively).
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/// @returns false if the file/directory was destroyed, true on error.
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/// @brief Removes the file or directory from the filesystem.
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bool eraseFromDisk(bool destroy_contents = false,
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std::string *Err = 0) const;
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/// @}
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/// @name Data
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/// @{
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protected:
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// Our win32 implementation relies on this string being mutable.
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mutable std::string path; ///< Storage for the path name.
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/// @}
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};
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/// This class is identical to Path class except it allows you to obtain the
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/// 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 explicit 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),
|
|
/// otherwise 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 is the OS-specific path separator: a colon on Unix or a semicolon
|
|
/// on Windows.
|
|
extern const char PathSeparator;
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|