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07aac43603
llvm-6502/include/llvm/Support/FileSystem.h
Rafael Espindola 07aac43603 Implement get_magic with generic tools and inline it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210716 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-11 22:53:00 +00:00

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//===- llvm/Support/FileSystem.h - File System OS 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::fs namespace. It is designed after
// TR2/boost filesystem (v3), but modified to remove exception handling and the
// path class.
//
// All functions return an error_code and their actual work via the last out
// argument. The out argument is defined if and only if errc::success is
// returned. A function may return any error code in the generic or system
// category. However, they shall be equivalent to any error conditions listed
// in each functions respective documentation if the condition applies. [ note:
// this does not guarantee that error_code will be in the set of explicitly
// listed codes, but it does guarantee that if any of the explicitly listed
// errors occur, the correct error_code will be used ]. All functions may
// return errc::not_enough_memory if there is not enough memory to complete the
// operation.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_FILESYSTEM_H
#define LLVM_SUPPORT_FILESYSTEM_H
#include "llvm/ADT/IntrusiveRefCntPtr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TimeValue.h"
#include "llvm/Support/system_error.h"
#include <ctime>
#include <iterator>
#include <stack>
#include <string>
#include <tuple>
#include <vector>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
namespace llvm {
namespace sys {
namespace fs {
/// An enumeration for the file system's view of the type.
enum class file_type {
status_error,
file_not_found,
regular_file,
directory_file,
symlink_file,
block_file,
character_file,
fifo_file,
socket_file,
type_unknown
};
/// space_info - Self explanatory.
struct space_info {
uint64_t capacity;
uint64_t free;
uint64_t available;
};
enum perms {
no_perms = 0,
owner_read = 0400,
owner_write = 0200,
owner_exe = 0100,
owner_all = owner_read | owner_write | owner_exe,
group_read = 040,
group_write = 020,
group_exe = 010,
group_all = group_read | group_write | group_exe,
others_read = 04,
others_write = 02,
others_exe = 01,
others_all = others_read | others_write | others_exe,
all_read = owner_read | group_read | others_read,
all_write = owner_write | group_write | others_write,
all_exe = owner_exe | group_exe | others_exe,
all_all = owner_all | group_all | others_all,
set_uid_on_exe = 04000,
set_gid_on_exe = 02000,
sticky_bit = 01000,
perms_not_known = 0xFFFF
};
// Helper functions so that you can use & and | to manipulate perms bits:
inline perms operator|(perms l , perms r) {
return static_cast<perms>(
static_cast<unsigned short>(l) | static_cast<unsigned short>(r));
}
inline perms operator&(perms l , perms r) {
return static_cast<perms>(
static_cast<unsigned short>(l) & static_cast<unsigned short>(r));
}
inline perms &operator|=(perms &l, perms r) {
l = l | r;
return l;
}
inline perms &operator&=(perms &l, perms r) {
l = l & r;
return l;
}
inline perms operator~(perms x) {
return static_cast<perms>(~static_cast<unsigned short>(x));
}
class UniqueID {
uint64_t Device;
uint64_t File;
public:
UniqueID() {}
UniqueID(uint64_t Device, uint64_t File) : Device(Device), File(File) {}
bool operator==(const UniqueID &Other) const {
return Device == Other.Device && File == Other.File;
}
bool operator!=(const UniqueID &Other) const { return !(*this == Other); }
bool operator<(const UniqueID &Other) const {
return std::tie(Device, File) < std::tie(Other.Device, Other.File);
}
uint64_t getDevice() const { return Device; }
uint64_t getFile() const { return File; }
};
/// file_status - Represents the result of a call to stat and friends. It has
/// a platform specific member to store the result.
class file_status
{
#if defined(LLVM_ON_UNIX)
dev_t fs_st_dev;
ino_t fs_st_ino;
time_t fs_st_mtime;
uid_t fs_st_uid;
gid_t fs_st_gid;
off_t fs_st_size;
#elif defined (LLVM_ON_WIN32)
uint32_t LastWriteTimeHigh;
uint32_t LastWriteTimeLow;
uint32_t VolumeSerialNumber;
uint32_t FileSizeHigh;
uint32_t FileSizeLow;
uint32_t FileIndexHigh;
uint32_t FileIndexLow;
#endif
friend bool equivalent(file_status A, file_status B);
file_type Type;
perms Perms;
public:
#if defined(LLVM_ON_UNIX)
file_status() : fs_st_dev(0), fs_st_ino(0), fs_st_mtime(0),
fs_st_uid(0), fs_st_gid(0), fs_st_size(0),
Type(file_type::status_error), Perms(perms_not_known) {}
file_status(file_type Type) : fs_st_dev(0), fs_st_ino(0), fs_st_mtime(0),
fs_st_uid(0), fs_st_gid(0), fs_st_size(0), Type(Type),
Perms(perms_not_known) {}
file_status(file_type Type, perms Perms, dev_t Dev, ino_t Ino, time_t MTime,
uid_t UID, gid_t GID, off_t Size)
: fs_st_dev(Dev), fs_st_ino(Ino), fs_st_mtime(MTime), fs_st_uid(UID),
fs_st_gid(GID), fs_st_size(Size), Type(Type), Perms(Perms) {}
#elif defined(LLVM_ON_WIN32)
file_status() : LastWriteTimeHigh(0), LastWriteTimeLow(0),
VolumeSerialNumber(0), FileSizeHigh(0), FileSizeLow(0),
FileIndexHigh(0), FileIndexLow(0), Type(file_type::status_error),
Perms(perms_not_known) {}
file_status(file_type Type) : LastWriteTimeHigh(0), LastWriteTimeLow(0),
VolumeSerialNumber(0), FileSizeHigh(0), FileSizeLow(0),
FileIndexHigh(0), FileIndexLow(0), Type(Type),
Perms(perms_not_known) {}
file_status(file_type Type, uint32_t LastWriteTimeHigh,
uint32_t LastWriteTimeLow, uint32_t VolumeSerialNumber,
uint32_t FileSizeHigh, uint32_t FileSizeLow,
uint32_t FileIndexHigh, uint32_t FileIndexLow)
: LastWriteTimeHigh(LastWriteTimeHigh),
LastWriteTimeLow(LastWriteTimeLow),
VolumeSerialNumber(VolumeSerialNumber), FileSizeHigh(FileSizeHigh),
FileSizeLow(FileSizeLow), FileIndexHigh(FileIndexHigh),
FileIndexLow(FileIndexLow), Type(Type), Perms(perms_not_known) {}
#endif
// getters
file_type type() const { return Type; }
perms permissions() const { return Perms; }
TimeValue getLastModificationTime() const;
UniqueID getUniqueID() const;
#if defined(LLVM_ON_UNIX)
uint32_t getUser() const { return fs_st_uid; }
uint32_t getGroup() const { return fs_st_gid; }
uint64_t getSize() const { return fs_st_size; }
#elif defined (LLVM_ON_WIN32)
uint32_t getUser() const {
return 9999; // Not applicable to Windows, so...
}
uint32_t getGroup() const {
return 9999; // Not applicable to Windows, so...
}
uint64_t getSize() const {
return (uint64_t(FileSizeHigh) << 32) + FileSizeLow;
}
#endif
// setters
void type(file_type v) { Type = v; }
void permissions(perms p) { Perms = p; }
};
/// file_magic - An "enum class" enumeration of file types based on magic (the first
/// N bytes of the file).
struct file_magic {
enum Impl {
unknown = 0, ///< Unrecognized file
bitcode, ///< Bitcode file
archive, ///< ar style archive file
elf_relocatable, ///< ELF Relocatable object file
elf_executable, ///< ELF Executable image
elf_shared_object, ///< ELF dynamically linked shared lib
elf_core, ///< ELF core image
macho_object, ///< Mach-O Object file
macho_executable, ///< Mach-O Executable
macho_fixed_virtual_memory_shared_lib, ///< Mach-O Shared Lib, FVM
macho_core, ///< Mach-O Core File
macho_preload_executable, ///< Mach-O Preloaded Executable
macho_dynamically_linked_shared_lib, ///< Mach-O dynlinked shared lib
macho_dynamic_linker, ///< The Mach-O dynamic linker
macho_bundle, ///< Mach-O Bundle file
macho_dynamically_linked_shared_lib_stub, ///< Mach-O Shared lib stub
macho_dsym_companion, ///< Mach-O dSYM companion file
macho_universal_binary, ///< Mach-O universal binary
coff_object, ///< COFF object file
coff_import_library, ///< COFF import library
pecoff_executable, ///< PECOFF executable file
windows_resource ///< Windows compiled resource file (.rc)
};
bool is_object() const {
return V == unknown ? false : true;
}
file_magic() : V(unknown) {}
file_magic(Impl V) : V(V) {}
operator Impl() const { return V; }
private:
Impl V;
};
/// @}
/// @name Physical Operators
/// @{
/// @brief Make \a path an absolute path.
///
/// Makes \a path absolute using the current directory if it is not already. An
/// empty \a path will result in the current directory.
///
/// /absolute/path => /absolute/path
/// relative/../path => <current-directory>/relative/../path
///
/// @param path A path that is modified to be an absolute path.
/// @returns errc::success if \a path has been made absolute, otherwise a
/// platform specific error_code.
error_code make_absolute(SmallVectorImpl<char> &path);
/// @brief Normalize path separators in \a Path
///
/// If the path contains any '\' separators, they are transformed into '/'.
/// This is particularly useful when cross-compiling Windows on Linux, but is
/// safe to invoke on Windows, which accepts both characters as a path
/// separator.
error_code normalize_separators(SmallVectorImpl<char> &Path);
/// @brief Create all the non-existent directories in path.
///
/// @param path Directories to create.
/// @returns errc::success if is_directory(path), otherwise a platform
/// specific error_code. If IgnoreExisting is false, also returns
/// error if the directory already existed.
error_code create_directories(const Twine &path, bool IgnoreExisting = true);
/// @brief Create the directory in path.
///
/// @param path Directory to create.
/// @returns errc::success if is_directory(path), otherwise a platform
/// specific error_code. If IgnoreExisting is false, also returns
/// error if the directory already existed.
error_code create_directory(const Twine &path, bool IgnoreExisting = true);
/// @brief Create a link from \a from to \a to.
///
/// The link may be a soft or a hard link, depending on the platform. The caller
/// may not assume which one. Currently on windows it creates a hard link since
/// soft links require extra privileges. On unix, it creates a soft link since
/// hard links don't work on SMB file systems.
///
/// @param to The path to hard link to.
/// @param from The path to hard link from. This is created.
/// @returns errc::success if the link was created, otherwise a platform
/// specific error_code.
error_code create_link(const Twine &to, const Twine &from);
/// @brief Get the current path.
///
/// @param result Holds the current path on return.
/// @returns errc::success if the current path has been stored in result,
/// otherwise a platform specific error_code.
error_code current_path(SmallVectorImpl<char> &result);
/// @brief Remove path. Equivalent to POSIX remove().
///
/// @param path Input path.
/// @returns errc::success if path has been removed or didn't exist, otherwise a
/// platform specific error code. If IgnoreNonExisting is false, also
/// returns error if the file didn't exist.
error_code remove(const Twine &path, bool IgnoreNonExisting = true);
/// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
///
/// @param from The path to rename from.
/// @param to The path to rename to. This is created.
error_code rename(const Twine &from, const Twine &to);
/// @brief Resize path to size. File is resized as if by POSIX truncate().
///
/// @param path Input path.
/// @param size Size to resize to.
/// @returns errc::success if \a path has been resized to \a size, otherwise a
/// platform specific error_code.
error_code resize_file(const Twine &path, uint64_t size);
/// @}
/// @name Physical Observers
/// @{
/// @brief Does file exist?
///
/// @param status A file_status previously returned from stat.
/// @returns True if the file represented by status exists, false if it does
/// not.
bool exists(file_status status);
/// @brief Does file exist?
///
/// @param path Input path.
/// @param result Set to true if the file represented by status exists, false if
/// it does not. Undefined otherwise.
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
error_code exists(const Twine &path, bool &result);
/// @brief Simpler version of exists for clients that don't need to
/// differentiate between an error and false.
inline bool exists(const Twine &path) {
bool result;
return !exists(path, result) && result;
}
/// @brief Can we execute this file?
///
/// @param Path Input path.
/// @returns True if we can execute it, false otherwise.
bool can_execute(const Twine &Path);
/// @brief Can we write this file?
///
/// @param Path Input path.
/// @returns True if we can write to it, false otherwise.
bool can_write(const Twine &Path);
/// @brief Do file_status's represent the same thing?
///
/// @param A Input file_status.
/// @param B Input file_status.
///
/// assert(status_known(A) || status_known(B));
///
/// @returns True if A and B both represent the same file system entity, false
/// otherwise.
bool equivalent(file_status A, file_status B);
/// @brief Do paths represent the same thing?
///
/// assert(status_known(A) || status_known(B));
///
/// @param A Input path A.
/// @param B Input path B.
/// @param result Set to true if stat(A) and stat(B) have the same device and
/// inode (or equivalent).
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
error_code equivalent(const Twine &A, const Twine &B, bool &result);
/// @brief Simpler version of equivalent for clients that don't need to
/// differentiate between an error and false.
inline bool equivalent(const Twine &A, const Twine &B) {
bool result;
return !equivalent(A, B, result) && result;
}
/// @brief Does status represent a directory?
///
/// @param status A file_status previously returned from status.
/// @returns status.type() == file_type::directory_file.
bool is_directory(file_status status);
/// @brief Is path a directory?
///
/// @param path Input path.
/// @param result Set to true if \a path is a directory, false if it is not.
/// Undefined otherwise.
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
error_code is_directory(const Twine &path, bool &result);
/// @brief Simpler version of is_directory for clients that don't need to
/// differentiate between an error and false.
inline bool is_directory(const Twine &Path) {
bool Result;
return !is_directory(Path, Result) && Result;
}
/// @brief Does status represent a regular file?
///
/// @param status A file_status previously returned from status.
/// @returns status_known(status) && status.type() == file_type::regular_file.
bool is_regular_file(file_status status);
/// @brief Is path a regular file?
///
/// @param path Input path.
/// @param result Set to true if \a path is a regular file, false if it is not.
/// Undefined otherwise.
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
error_code is_regular_file(const Twine &path, bool &result);
/// @brief Simpler version of is_regular_file for clients that don't need to
/// differentiate between an error and false.
inline bool is_regular_file(const Twine &Path) {
bool Result;
if (is_regular_file(Path, Result))
return false;
return Result;
}
/// @brief Does this status represent something that exists but is not a
/// directory, regular file, or symlink?
///
/// @param status A file_status previously returned from status.
/// @returns exists(s) && !is_regular_file(s) && !is_directory(s)
bool is_other(file_status status);
/// @brief Is path something that exists but is not a directory,
/// regular file, or symlink?
///
/// @param path Input path.
/// @param result Set to true if \a path exists, but is not a directory, regular
/// file, or a symlink, false if it does not. Undefined otherwise.
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
error_code is_other(const Twine &path, bool &result);
/// @brief Get file status as if by POSIX stat().
///
/// @param path Input path.
/// @param result Set to the file status.
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
error_code status(const Twine &path, file_status &result);
/// @brief A version for when a file descriptor is already available.
error_code status(int FD, file_status &Result);
/// @brief Get file size.
///
/// @param Path Input path.
/// @param Result Set to the size of the file in \a Path.
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
inline error_code file_size(const Twine &Path, uint64_t &Result) {
file_status Status;
error_code EC = status(Path, Status);
if (EC)
return EC;
Result = Status.getSize();
return error_code();
}
/// @brief Set the file modification and access time.
///
/// @returns errc::success if the file times were successfully set, otherwise a
/// platform specific error_code or errc::not_supported on platforms
/// where the functionality isn't available.
error_code setLastModificationAndAccessTime(int FD, TimeValue Time);
/// @brief Is status available?
///
/// @param s Input file status.
/// @returns True if status() != status_error.
bool status_known(file_status s);
/// @brief Is status available?
///
/// @param path Input path.
/// @param result Set to true if status() != status_error.
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
error_code status_known(const Twine &path, bool &result);
/// @brief Create a uniquely named file.
///
/// Generates a unique path suitable for a temporary file and then opens it as a
/// file. The name is based on \a model with '%' replaced by a random char in
/// [0-9a-f]. If \a model is not an absolute path, a suitable temporary
/// directory will be prepended.
///
/// Example: clang-%%-%%-%%-%%-%%.s => clang-a0-b1-c2-d3-e4.s
///
/// This is an atomic operation. Either the file is created and opened, or the
/// file system is left untouched.
///
/// The intendend use is for files that are to be kept, possibly after
/// renaming them. For example, when running 'clang -c foo.o', the file can
/// be first created as foo-abc123.o and then renamed.
///
/// @param Model Name to base unique path off of.
/// @param ResultFD Set to the opened file's file descriptor.
/// @param ResultPath Set to the opened file's absolute path.
/// @returns errc::success if Result{FD,Path} have been successfully set,
/// otherwise a platform specific error_code.
error_code createUniqueFile(const Twine &Model, int &ResultFD,
SmallVectorImpl<char> &ResultPath,
unsigned Mode = all_read | all_write);
/// @brief Simpler version for clients that don't want an open file.
error_code createUniqueFile(const Twine &Model,
SmallVectorImpl<char> &ResultPath);
/// @brief Create a file in the system temporary directory.
///
/// The filename is of the form prefix-random_chars.suffix. Since the directory
/// is not know to the caller, Prefix and Suffix cannot have path separators.
/// The files are created with mode 0600.
///
/// This should be used for things like a temporary .s that is removed after
/// running the assembler.
error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
int &ResultFD,
SmallVectorImpl<char> &ResultPath);
/// @brief Simpler version for clients that don't want an open file.
error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
SmallVectorImpl<char> &ResultPath);
error_code createUniqueDirectory(const Twine &Prefix,
SmallVectorImpl<char> &ResultPath);
enum OpenFlags : unsigned {
F_None = 0,
/// F_Excl - When opening a file, this flag makes raw_fd_ostream
/// report an error if the file already exists.
F_Excl = 1,
/// F_Append - When opening a file, if it already exists append to the
/// existing file instead of returning an error. This may not be specified
/// with F_Excl.
F_Append = 2,
/// The file should be opened in text mode on platforms that make this
/// distinction.
F_Text = 4,
/// Open the file for read and write.
F_RW = 8
};
inline OpenFlags operator|(OpenFlags A, OpenFlags B) {
return OpenFlags(unsigned(A) | unsigned(B));
}
inline OpenFlags &operator|=(OpenFlags &A, OpenFlags B) {
A = A | B;
return A;
}
error_code openFileForWrite(const Twine &Name, int &ResultFD, OpenFlags Flags,
unsigned Mode = 0666);
error_code openFileForRead(const Twine &Name, int &ResultFD);
/// @brief Identify the type of a binary file based on how magical it is.
file_magic identify_magic(StringRef magic);
/// @brief Get and identify \a path's type based on its content.
///
/// @param path Input path.
/// @param result Set to the type of file, or file_magic::unknown.
/// @returns errc::success if result has been successfully set, otherwise a
/// platform specific error_code.
error_code identify_magic(const Twine &path, file_magic &result);
error_code getUniqueID(const Twine Path, UniqueID &Result);
/// This class represents a memory mapped file. It is based on
/// boost::iostreams::mapped_file.
class mapped_file_region {
mapped_file_region() LLVM_DELETED_FUNCTION;
mapped_file_region(mapped_file_region&) LLVM_DELETED_FUNCTION;
mapped_file_region &operator =(mapped_file_region&) LLVM_DELETED_FUNCTION;
public:
enum mapmode {
readonly, ///< May only access map via const_data as read only.
readwrite, ///< May access map via data and modify it. Written to path.
priv ///< May modify via data, but changes are lost on destruction.
};
private:
/// Platform specific mapping state.
mapmode Mode;
uint64_t Size;
void *Mapping;
#ifdef LLVM_ON_WIN32
int FileDescriptor;
void *FileHandle;
void *FileMappingHandle;
#endif
error_code init(int FD, bool CloseFD, uint64_t Offset);
public:
typedef char char_type;
mapped_file_region(mapped_file_region&&);
mapped_file_region &operator =(mapped_file_region&&);
/// Construct a mapped_file_region at \a path starting at \a offset of length
/// \a length and with access \a mode.
///
/// \param path Path to the file to map. If it does not exist it will be
/// created.
/// \param mode How to map the memory.
/// \param length Number of bytes to map in starting at \a offset. If the file
/// is shorter than this, it will be extended. If \a length is
/// 0, the entire file will be mapped.
/// \param offset Byte offset from the beginning of the file where the map
/// should begin. Must be a multiple of
/// mapped_file_region::alignment().
/// \param ec This is set to errc::success if the map was constructed
/// successfully. Otherwise it is set to a platform dependent error.
mapped_file_region(const Twine &path,
mapmode mode,
uint64_t length,
uint64_t offset,
error_code &ec);
/// \param fd An open file descriptor to map. mapped_file_region takes
/// ownership if closefd is true. It must have been opended in the correct
/// mode.
mapped_file_region(int fd,
bool closefd,
mapmode mode,
uint64_t length,
uint64_t offset,
error_code &ec);
~mapped_file_region();
mapmode flags() const;
uint64_t size() const;
char *data() const;
/// Get a const view of the data. Modifying this memory has undefined
/// behavior.
const char *const_data() const;
/// \returns The minimum alignment offset must be.
static int alignment();
};
/// 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.
std::string getMainExecutable(const char *argv0, void *MainExecAddr);
/// @}
/// @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 is
/// called.
class directory_entry {
std::string Path;
mutable file_status Status;
public:
explicit directory_entry(const Twine &path, file_status st = file_status())
: Path(path.str())
, Status(st) {}
directory_entry() {}
void assign(const Twine &path, file_status st = file_status()) {
Path = path.str();
Status = st;
}
void replace_filename(const Twine &filename, file_status st = file_status());
const std::string &path() const { return Path; }
error_code 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;
};
namespace detail {
struct DirIterState;
error_code directory_iterator_construct(DirIterState&, StringRef);
error_code directory_iterator_increment(DirIterState&);
error_code directory_iterator_destruct(DirIterState&);
/// DirIterState - Keeps state for the directory_iterator. It is reference
/// counted in order to preserve InputIterator semantics on copy.
struct DirIterState : public RefCountedBase<DirIterState> {
DirIterState()
: IterationHandle(0) {}
~DirIterState() {
directory_iterator_destruct(*this);
}
intptr_t IterationHandle;
directory_entry CurrentEntry;
};
}
/// 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 {
IntrusiveRefCntPtr<detail::DirIterState> State;
public:
explicit directory_iterator(const Twine &path, error_code &ec) {
State = new detail::DirIterState;
SmallString<128> path_storage;
ec = detail::directory_iterator_construct(*State,
path.toStringRef(path_storage));
}
explicit directory_iterator(const directory_entry &de, error_code &ec) {
State = new detail::DirIterState;
ec = detail::directory_iterator_construct(*State, de.path());
}
/// Construct end iterator.
directory_iterator() : State(nullptr) {}
// No operator++ because we need error_code.
directory_iterator &increment(error_code &ec) {
ec = directory_iterator_increment(*State);
return *this;
}
const directory_entry &operator*() const { return State->CurrentEntry; }
const directory_entry *operator->() const { return &State->CurrentEntry; }
bool operator==(const directory_iterator &RHS) const {
if (State == RHS.State)
return true;
if (!RHS.State)
return State->CurrentEntry == directory_entry();
if (!State)
return RHS.State->CurrentEntry == directory_entry();
return State->CurrentEntry == RHS.State->CurrentEntry;
}
bool operator!=(const directory_iterator &RHS) const {
return !(*this == RHS);
}
// Other members as required by
// C++ Std, 24.1.1 Input iterators [input.iterators]
};
namespace detail {
/// RecDirIterState - Keeps state for the recursive_directory_iterator. It is
/// reference counted in order to preserve InputIterator semantics on copy.
struct RecDirIterState : public RefCountedBase<RecDirIterState> {
RecDirIterState()
: Level(0)
, HasNoPushRequest(false) {}
std::stack<directory_iterator, std::vector<directory_iterator> > Stack;
uint16_t Level;
bool HasNoPushRequest;
};
}
/// recursive_directory_iterator - Same as directory_iterator except for it
/// recurses down into child directories.
class recursive_directory_iterator {
IntrusiveRefCntPtr<detail::RecDirIterState> State;
public:
recursive_directory_iterator() {}
explicit recursive_directory_iterator(const Twine &path, error_code &ec)
: State(new detail::RecDirIterState) {
State->Stack.push(directory_iterator(path, ec));
if (State->Stack.top() == directory_iterator())
State.reset();
}
// No operator++ because we need error_code.
recursive_directory_iterator &increment(error_code &ec) {
const directory_iterator end_itr;
if (State->HasNoPushRequest)
State->HasNoPushRequest = false;
else {
file_status st;
if ((ec = State->Stack.top()->status(st))) return *this;
if (is_directory(st)) {
State->Stack.push(directory_iterator(*State->Stack.top(), ec));
if (ec) return *this;
if (State->Stack.top() != end_itr) {
++State->Level;
return *this;
}
State->Stack.pop();
}
}
while (!State->Stack.empty()
&& State->Stack.top().increment(ec) == end_itr) {
State->Stack.pop();
--State->Level;
}
// Check if we are done. If so, create an end iterator.
if (State->Stack.empty())
State.reset();
return *this;
}
const directory_entry &operator*() const { return *State->Stack.top(); }
const directory_entry *operator->() const { return &*State->Stack.top(); }
// observers
/// Gets the current level. Starting path is at level 0.
int level() const { return State->Level; }
/// Returns true if no_push has been called for this directory_entry.
bool no_push_request() const { return State->HasNoPushRequest; }
// modifiers
/// Goes up one level if Level > 0.
void pop() {
assert(State && "Cannot pop an end iterator!");
assert(State->Level > 0 && "Cannot pop an iterator with level < 1");
const directory_iterator end_itr;
error_code ec;
do {
if (ec)
report_fatal_error("Error incrementing directory iterator.");
State->Stack.pop();
--State->Level;
} while (!State->Stack.empty()
&& State->Stack.top().increment(ec) == end_itr);
// Check if we are done. If so, create an end iterator.
if (State->Stack.empty())
State.reset();
}
/// Does not go down into the current directory_entry.
void no_push() { State->HasNoPushRequest = true; }
bool operator==(const recursive_directory_iterator &RHS) const {
return State == RHS.State;
}
bool operator!=(const recursive_directory_iterator &RHS) const {
return !(*this == RHS);
}
// Other members as required by
// C++ Std, 24.1.1 Input iterators [input.iterators]
};
/// @}
} // end namespace fs
} // end namespace sys
} // end namespace llvm
#endif
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