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691 lines
25 KiB
C++
691 lines
25 KiB
C++
//===- llvm/Support/FileSystem.h - File System OS 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::fs namespace. It is designed after
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// TR2/boost filesystem (v3), but modified to remove exception handling and the
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// path class.
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//
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// All functions return an error_code and their actual work via the last out
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// argument. The out argument is defined if and only if errc::success is
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// returned. A function may return any error code in the generic or system
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// category. However, they shall be equivalent to any error conditions listed
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// in each functions respective documentation if the condition applies. [ note:
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// this does not guarantee that error_code will be in the set of explicitly
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// listed codes, but it does guarantee that if any of the explicitly listed
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// errors occur, the correct error_code will be used ]. All functions may
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// return errc::not_enough_memory if there is not enough memory to complete the
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// operation.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_FILE_SYSTEM_H
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#define LLVM_SUPPORT_FILE_SYSTEM_H
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/PathV1.h"
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#include "llvm/Support/system_error.h"
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#include <ctime>
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#include <iterator>
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#include <string>
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namespace llvm {
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namespace sys {
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namespace fs {
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/// file_type - An "enum class" enumeration for the file system's view of the
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/// type.
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struct file_type {
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enum _ {
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status_error,
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file_not_found,
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regular_file,
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directory_file,
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symlink_file,
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block_file,
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character_file,
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fifo_file,
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socket_file,
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type_unknown
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};
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file_type(_ v) : v_(v) {}
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explicit file_type(int v) : v_(_(v)) {}
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operator int() const {return v_;}
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private:
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int v_;
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};
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/// copy_option - An "enum class" enumeration of copy semantics for copy
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/// operations.
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struct copy_option {
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enum _ {
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fail_if_exists,
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overwrite_if_exists
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};
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copy_option(_ v) : v_(v) {}
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explicit copy_option(int v) : v_(_(v)) {}
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operator int() const {return v_;}
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private:
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int v_;
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};
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/// space_info - Self explanatory.
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struct space_info {
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uint64_t capacity;
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uint64_t free;
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uint64_t available;
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};
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/// file_status - Represents the result of a call to stat and friends. It has
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/// a platform specific member to store the result.
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class file_status
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{
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// implementation defined status field.
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file_type Type;
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public:
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explicit file_status(file_type v=file_type::status_error)
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: Type(v) {}
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file_type type() const { return Type; }
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void type(file_type v) { Type = v; }
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};
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/// @}
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/// @name Physical Operators
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/// @{
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/// @brief Make \a path an absolute path.
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///
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/// Makes \a path absolute using the current directory if it is not already. An
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/// empty \a path will result in the current directory.
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///
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/// /absolute/path => /absolute/path
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/// relative/../path => <current-directory>/relative/../path
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///
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/// @param path A path that is modified to be an absolute path.
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/// @returns errc::success if \a path has been made absolute, otherwise a
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/// platform specific error_code.
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error_code make_absolute(SmallVectorImpl<char> &path);
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/// @brief Copy the file at \a from to the path \a to.
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///
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/// @param from The path to copy the file from.
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/// @param to The path to copy the file to.
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/// @param copt Behavior if \a to already exists.
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/// @returns errc::success if the file has been successfully copied.
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/// errc::file_exists if \a to already exists and \a copt ==
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/// copy_option::fail_if_exists. Otherwise a platform specific
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/// error_code.
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error_code copy_file(const Twine &from, const Twine &to,
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copy_option copt = copy_option::fail_if_exists);
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/// @brief Create all the non-existent directories in path.
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///
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/// @param path Directories to create.
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/// @param existed Set to true if \a path already existed, false otherwise.
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/// @returns errc::success if is_directory(path) and existed have been set,
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/// otherwise a platform specific error_code.
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error_code create_directories(const Twine &path, bool &existed);
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/// @brief Create the directory in path.
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///
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/// @param path Directory to create.
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/// @param existed Set to true if \a path already existed, false otherwise.
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/// @returns errc::success if is_directory(path) and existed have been set,
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/// otherwise a platform specific error_code.
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error_code create_directory(const Twine &path, bool &existed);
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/// @brief Create a hard link from \a from to \a to.
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///
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/// @param to The path to hard link to.
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/// @param from The path to hard link from. This is created.
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/// @returns errc::success if exists(to) && exists(from) && equivalent(to, from)
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/// , otherwise a platform specific error_code.
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error_code create_hard_link(const Twine &to, const Twine &from);
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/// @brief Create a symbolic link from \a from to \a to.
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///
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/// @param to The path to symbolically link to.
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/// @param from The path to symbolically link from. This is created.
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/// @returns errc::success if exists(to) && exists(from) && is_symlink(from),
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/// otherwise a platform specific error_code.
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error_code create_symlink(const Twine &to, const Twine &from);
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/// @brief Get the current path.
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///
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/// @param result Holds the current path on return.
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/// @results errc::success if the current path has been stored in result,
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/// otherwise a platform specific error_code.
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error_code current_path(SmallVectorImpl<char> &result);
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/// @brief Remove path. Equivalent to POSIX remove().
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///
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/// @param path Input path.
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/// @param existed Set to true if \a path existed, false if it did not.
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/// undefined otherwise.
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/// @results errc::success if path has been removed and existed has been
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/// successfully set, otherwise a platform specific error_code.
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error_code remove(const Twine &path, bool &existed);
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/// @brief Recursively remove all files below \a path, then \a path. Files are
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/// removed as if by POSIX remove().
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///
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/// @param path Input path.
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/// @param num_removed Number of files removed.
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/// @results errc::success if path has been removed and num_removed has been
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/// successfully set, otherwise a platform specific error_code.
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error_code remove_all(const Twine &path, uint32_t &num_removed);
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/// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
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///
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/// @param from The path to rename from.
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/// @param to The path to rename to. This is created.
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error_code rename(const Twine &from, const Twine &to);
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/// @brief Resize path to size. File is resized as if by POSIX truncate().
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///
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/// @param path Input path.
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/// @param size Size to resize to.
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/// @returns errc::success if \a path has been resized to \a size, otherwise a
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/// platform specific error_code.
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error_code resize_file(const Twine &path, uint64_t size);
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/// @brief Make file readable.
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///
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/// @param path Input path.
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/// @param value If true, make readable, else, make unreadable.
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/// @results errc::success if readability has been successfully set, otherwise a
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/// platform specific error_code.
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error_code set_read(const Twine &path, bool value);
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/// @brief Make file writeable.
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///
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/// @param path Input path.
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/// @param value If true, make writeable, else, make unwriteable.
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/// @results errc::success if writeability has been successfully set, otherwise
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/// a platform specific error_code.
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error_code set_write(const Twine &path, bool value);
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/// @brief Make file executable.
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///
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/// @param path Input path.
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/// @param value If true, make executable, else, make unexecutable.
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/// @results errc::success if executability has been successfully set, otherwise
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/// a platform specific error_code.
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error_code set_execute(const Twine &path, bool value);
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/// @}
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/// @name Physical Observers
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/// @{
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/// @brief Does file exist?
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///
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/// @param status A file_status previously returned from stat.
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/// @results True if the file represented by status exists, false if it does
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/// not.
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bool exists(file_status status);
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/// @brief Does file exist?
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///
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/// @param path Input path.
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/// @param result Set to true if the file represented by status exists, false if
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/// it does not. Undefined otherwise.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code exists(const Twine &path, bool &result);
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/// @brief Do file_status's represent the same thing?
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///
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/// @param A Input file_status.
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/// @param B Input file_status.
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///
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/// assert(status_known(A) || status_known(B));
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///
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/// @results True if A and B both represent the same file system entity, false
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/// otherwise.
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bool equivalent(file_status A, file_status B);
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/// @brief Do paths represent the same thing?
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///
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/// @param A Input path A.
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/// @param B Input path B.
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/// @param result Set to true if stat(A) and stat(B) have the same device and
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/// inode (or equivalent).
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code equivalent(const Twine &A, const Twine &B, bool &result);
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/// @brief Get file size.
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///
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/// @param path Input path.
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/// @param result Set to the size of the file in \a path.
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/// @returns errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code file_size(const Twine &path, uint64_t &result);
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/// @brief Does status represent a directory?
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///
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/// @param status A file_status previously returned from status.
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/// @results status.type() == file_type::directory_file.
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bool is_directory(file_status status);
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/// @brief Is path a directory?
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///
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/// @param path Input path.
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/// @param result Set to true if \a path is a directory, false if it is not.
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/// Undefined otherwise.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code is_directory(const Twine &path, bool &result);
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/// @brief Is path an empty file?
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///
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/// @param path Input path.
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/// @param result Set to true if \a path is a an empty file, false if it is not.
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/// Undefined otherwise.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code is_empty(const Twine &path, bool &result);
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/// @brief Does status represent a regular file?
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///
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/// @param status A file_status previously returned from status.
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/// @results status_known(status) && status.type() == file_type::regular_file.
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bool is_regular_file(file_status status);
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/// @brief Is path a regular file?
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///
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/// @param path Input path.
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/// @param result Set to true if \a path is a regular file, false if it is not.
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/// Undefined otherwise.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code is_regular_file(const Twine &path, bool &result);
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/// @brief Does this status represent something that exists but is not a
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/// directory, regular file, or symlink?
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///
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/// @param status A file_status previously returned from status.
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/// @results exists(s) && !is_regular_file(s) && !is_directory(s) &&
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/// !is_symlink(s)
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bool is_other(file_status status);
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/// @brief Is path something that exists but is not a directory,
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/// regular file, or symlink?
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///
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/// @param path Input path.
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/// @param result Set to true if \a path exists, but is not a directory, regular
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/// file, or a symlink, false if it does not. Undefined otherwise.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code is_other(const Twine &path, bool &result);
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/// @brief Does status represent a symlink?
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///
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/// @param status A file_status previously returned from stat.
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/// @param result status.type() == symlink_file.
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bool is_symlink(file_status status);
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/// @brief Is path a symlink?
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///
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/// @param path Input path.
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/// @param result Set to true if \a path is a symlink, false if it is not.
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/// Undefined otherwise.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code is_symlink(const Twine &path, bool &result);
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/// @brief Get last write time without changing it.
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///
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/// @param path Input path.
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/// @param result Set to the last write time (UNIX time) of \a path if it
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/// exists.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code last_write_time(const Twine &path, std::time_t &result);
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/// @brief Set last write time.
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///
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/// @param path Input path.
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/// @param value Time to set (UNIX time) \a path's last write time to.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code set_last_write_time(const Twine &path, std::time_t value);
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/// @brief Read a symlink's value.
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///
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/// @param path Input path.
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/// @param result Set to the value of the symbolic link \a path.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code read_symlink(const Twine &path, SmallVectorImpl<char> &result);
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/// @brief Get disk space usage information.
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///
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/// @param path Input path.
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/// @param result Set to the capacity, free, and available space on the device
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/// \a path is on.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code disk_space(const Twine &path, space_info &result);
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/// @brief Get file status as if by POSIX stat().
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///
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/// @param path Input path.
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/// @param result Set to the file status.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code status(const Twine &path, file_status &result);
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/// @brief Is status available?
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///
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/// @param path Input path.
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/// @results True if status() != status_error.
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bool status_known(file_status s);
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/// @brief Is status available?
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///
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/// @param path Input path.
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/// @param result Set to true if status() != status_error.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code status_known(const Twine &path, bool &result);
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/// @brief Get file status as if by POSIX lstat().
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///
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/// Does not resolve symlinks.
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///
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/// @param path Input path.
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/// @param result Set to the file status.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code symlink_status(const Twine &path, file_status &result);
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/// @brief Generate a unique path and open it as a file.
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///
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/// Generates a unique path suitable for a temporary file and then opens it as a
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/// file. The name is based on \a model with '%' replaced by a random char in
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/// [0-9a-f]. If \a model is not an absolute path, a suitable temporary
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/// directory will be prepended.
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///
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/// This is an atomic operation. Either the file is created and opened, or the
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/// file system is left untouched.
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///
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/// clang-%%-%%-%%-%%-%%.s => /tmp/clang-a0-b1-c2-d3-e4.s
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///
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/// @param model Name to base unique path off of.
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/// @param result_fs Set to the opened file's file descriptor.
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/// @param result_path Set to the opened file's absolute path.
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/// @results errc::success if result_{fd,path} have been successfully set,
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/// otherwise a platform specific error_code.
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error_code unique_file(const Twine &model, int &result_fd,
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SmallVectorImpl<char> &result_path);
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/// @brief Canonicalize path.
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///
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/// Sets result to the file system's idea of what path is. The result is always
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/// absolute and has the same capitalization as the file system.
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///
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/// @param path Input path.
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/// @param result Set to the canonicalized version of \a path.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result);
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/// @brief Are \a path's first bytes \a magic?
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///
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/// @param path Input path.
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/// @param magic Byte sequence to compare \a path's first len(magic) bytes to.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code has_magic(const Twine &path, const Twine &magic, bool &result);
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/// @brief Get \a path's first \a len bytes.
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///
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/// @param path Input path.
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/// @param len Number of magic bytes to get.
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/// @param result Set to the first \a len bytes in the file pointed to by
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/// \a path. Or the entire file if file_size(path) < len, in which
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/// case result.size() returns the size of the file.
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/// @results errc::success if result has been successfully set,
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/// errc::value_too_large if len is larger then the file pointed to by
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/// \a path, otherwise a platform specific error_code.
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error_code get_magic(const Twine &path, uint32_t len,
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SmallVectorImpl<char> &result);
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/// @brief Get and identify \a path's type based on its content.
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///
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/// @param path Input path.
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/// @param result Set to the type of file, or LLVMFileType::Unknown_FileType.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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error_code identify_magic(const Twine &path, LLVMFileType &result);
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/// @brief Is file bitcode?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to true if \a path is a bitcode file, false if it is not,
|
|
/// undefined otherwise.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code is_bitcode(const Twine &path, bool &result);
|
|
|
|
/// @brief Is file a dynamic library?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to true if \a path is a dynamic library, false if it is
|
|
/// not, undefined otherwise.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code is_dynamic_library(const Twine &path, bool &result);
|
|
|
|
/// @brief Is an object file?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to true if \a path is an object file, false if it is not,
|
|
/// undefined otherwise.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code is_object_file(const Twine &path, bool &result);
|
|
|
|
/// @brief Can file be read?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to true if \a path is readable, false it it is not,
|
|
/// undefined otherwise.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code can_read(const Twine &path, bool &result);
|
|
|
|
/// @brief Can file be written?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to true if \a path is writeable, false it it is not,
|
|
/// undefined otherwise.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code can_write(const Twine &path, bool &result);
|
|
|
|
/// @brief Can file be executed?
|
|
///
|
|
/// @param path Input path.
|
|
/// @param result Set to true if \a path is executable, false it it is not,
|
|
/// undefined otherwise.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code can_execute(const Twine &path, bool &result);
|
|
|
|
/// @brief Get library paths the system linker uses.
|
|
///
|
|
/// @param result Set to the list of system library paths.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code GetSystemLibraryPaths(SmallVectorImpl<std::string> &result);
|
|
|
|
/// @brief Get bitcode library paths the system linker uses
|
|
/// + LLVM_LIB_SEARCH_PATH + LLVM_LIBDIR.
|
|
///
|
|
/// @param result Set to the list of bitcode library paths.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code GetBitcodeLibraryPaths(SmallVectorImpl<std::string> &result);
|
|
|
|
/// @brief Find a library.
|
|
///
|
|
/// Find the path to a library using its short name. Use the system
|
|
/// dependent library paths to locate the library.
|
|
///
|
|
/// c => /usr/lib/libc.so
|
|
///
|
|
/// @param short_name Library name one would give to the system linker.
|
|
/// @param result Set to the absolute path \a short_name represents.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code FindLibrary(const Twine &short_name, SmallVectorImpl<char> &result);
|
|
|
|
/// @brief Get absolute path of main executable.
|
|
///
|
|
/// @param argv0 The program name as it was spelled on the command line.
|
|
/// @param MainAddr Address of some symbol in the executable (not in a library).
|
|
/// @param result Set to the absolute path of the current executable.
|
|
/// @results errc::success if result has been successfully set, otherwise a
|
|
/// platform specific error_code.
|
|
error_code GetMainExecutable(const char *argv0, void *MainAddr,
|
|
SmallVectorImpl<char> &result);
|
|
|
|
/// @}
|
|
/// @name Iterators
|
|
/// @{
|
|
|
|
/// directory_entry - A single entry in a directory. Caches the status either
|
|
/// from the result of the iteration syscall, or the first time status or
|
|
/// symlink_status is called.
|
|
class directory_entry {
|
|
std::string Path;
|
|
mutable file_status Status;
|
|
mutable file_status SymlinkStatus;
|
|
|
|
public:
|
|
explicit directory_entry(const Twine &path, file_status st = file_status(),
|
|
file_status symlink_st = file_status())
|
|
: Path(path.str())
|
|
, Status(st)
|
|
, SymlinkStatus(symlink_st) {}
|
|
|
|
directory_entry() {}
|
|
|
|
void assign(const Twine &path, file_status st = file_status(),
|
|
file_status symlink_st = file_status()) {
|
|
Path = path.str();
|
|
Status = st;
|
|
SymlinkStatus = symlink_st;
|
|
}
|
|
|
|
void replace_filename(const Twine &filename, file_status st = file_status(),
|
|
file_status symlink_st = file_status());
|
|
|
|
const std::string &path() const { return Path; }
|
|
error_code status(file_status &result) const;
|
|
error_code symlink_status(file_status &result) const;
|
|
|
|
bool operator==(const directory_entry& rhs) const { return Path == rhs.Path; }
|
|
bool operator!=(const directory_entry& rhs) const { return !(*this == rhs); }
|
|
bool operator< (const directory_entry& rhs) const;
|
|
bool operator<=(const directory_entry& rhs) const;
|
|
bool operator> (const directory_entry& rhs) const;
|
|
bool operator>=(const directory_entry& rhs) const;
|
|
};
|
|
|
|
/// directory_iterator - Iterates through the entries in path. There is no
|
|
/// operator++ because we need an error_code. If it's really needed we can make
|
|
/// it call report_fatal_error on error.
|
|
class directory_iterator {
|
|
intptr_t IterationHandle;
|
|
directory_entry CurrentEntry;
|
|
|
|
// Platform implementations implement these functions to handle iteration.
|
|
friend error_code directory_iterator_construct(directory_iterator &it,
|
|
StringRef path);
|
|
friend error_code directory_iterator_increment(directory_iterator &it);
|
|
friend error_code directory_iterator_destruct(directory_iterator &it);
|
|
|
|
public:
|
|
explicit directory_iterator(const Twine &path, error_code &ec)
|
|
: IterationHandle(0) {
|
|
SmallString<128> path_storage;
|
|
ec = directory_iterator_construct(*this, path.toStringRef(path_storage));
|
|
}
|
|
|
|
/// Construct end iterator.
|
|
directory_iterator() : IterationHandle(0) {}
|
|
|
|
~directory_iterator() {
|
|
directory_iterator_destruct(*this);
|
|
}
|
|
|
|
// No operator++ because we need error_code.
|
|
directory_iterator &increment(error_code &ec) {
|
|
ec = directory_iterator_increment(*this);
|
|
return *this;
|
|
}
|
|
|
|
const directory_entry &operator*() const { return CurrentEntry; }
|
|
const directory_entry *operator->() const { return &CurrentEntry; }
|
|
|
|
bool operator!=(const directory_iterator &RHS) const {
|
|
return CurrentEntry != RHS.CurrentEntry;
|
|
}
|
|
// Other members as required by
|
|
// C++ Std, 24.1.1 Input iterators [input.iterators]
|
|
};
|
|
|
|
/// recursive_directory_iterator - Same as directory_iterator except for it
|
|
/// recurses down into child directories.
|
|
class recursive_directory_iterator {
|
|
uint16_t Level;
|
|
bool HasNoPushRequest;
|
|
// implementation directory iterator status
|
|
|
|
public:
|
|
explicit recursive_directory_iterator(const Twine &path, error_code &ec);
|
|
// No operator++ because we need error_code.
|
|
directory_iterator &increment(error_code &ec);
|
|
|
|
const directory_entry &operator*() const;
|
|
const directory_entry *operator->() const;
|
|
|
|
// observers
|
|
/// Gets the current level. path is at level 0.
|
|
int level() const;
|
|
/// Returns true if no_push has been called for this directory_entry.
|
|
bool no_push_request() const;
|
|
|
|
// modifiers
|
|
/// Goes up one level if Level > 0.
|
|
void pop();
|
|
/// Does not go down into the current directory_entry.
|
|
void no_push();
|
|
|
|
// Other members as required by
|
|
// C++ Std, 24.1.1 Input iterators [input.iterators]
|
|
};
|
|
|
|
/// @}
|
|
|
|
} // end namespace fs
|
|
} // end namespace sys
|
|
} // end namespace llvm
|
|
|
|
#endif
|