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For PR789: 

* Add a method: bool isAbsolute() const, which determines if the path name
  is absolute or not.
* Implement caching of file status information in the Path object. Allow it
  to be updated forcefully or lazily re-fetched from the cached value.

llvm-svn: 35456
This commit is contained in:
Reid Spencer 2007-03-29 16:43:20 +00:00
parent 908f777886
commit 0f92f0e519
3 changed files with 63 additions and 30 deletions
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18
llvm/include/llvm/System/Path.h
View File

@ -123,7 +123,7 @@ namespace sys {
/// Find the path to a library using its short name. Use the system
/// dependent library paths to locate the library.
/// @brief Find a library.
static Path FindLibrary(std::string& short_name);
static Path FindLibrary(std::string& short_name);
/// Construct a path to the default LLVM configuration directory. The
/// implementation must ensure that this is a well-known (same on many
@ -162,14 +162,14 @@ namespace sys {
/// provided so that they can be used to indicate null or error results in
/// other lib/System functionality.
/// @brief Construct an empty (and invalid) path.
Path() : path() {}
Path() : path(), status(0) {}
/// This constructor will accept a std::string as a path. No checking is
/// done on this path to determine if it is valid. To determine validity
/// of the path, use the isValid method.
/// @param p The path to assign.
/// @brief Construct a Path from a string.
explicit Path(const std::string& p) : path(p) {}
explicit Path(const std::string& p) : path(p), status(0) {}
/// @}
/// @name Operators
@ -265,6 +265,11 @@ namespace sys {
/// @brief Determines if the path references the root directory.
bool isRootDirectory() const;
/// This function determines if the path name is absolute, as opposed to
/// relative.
/// @breif Determine if the path is absolute.
bool isAbsolute() const;
/// This function opens the file associated with the path name provided by
/// the Path object and reads its magic number. If the magic number at the
/// start of the file matches \p magic, true is returned. In all other
@ -352,7 +357,11 @@ namespace sys {
/// of the file system. This returns false on success, or true on error
/// and fills in the specified error string if specified.
/// @brief Get file status.
bool getFileStatus(FileStatus &Status, std::string *Error = 0) const;
bool getFileStatus(
FileStatus &Status, ///< The resulting file status
bool forceUpdate = false, ///< Force an update from the file system
std::string *Error = 0 ///< Optional place to return an error msg.
) const;
/// @}
/// @name Path Mutators
@ -511,6 +520,7 @@ namespace sys {
/// @{
private:
mutable std::string path; ///< Storage for the path name.
mutable FileStatus *status; ///< Status information.
/// @}
};

34
llvm/lib/System/Unix/Path.inc
View File

@ -79,6 +79,12 @@ Path::isValid() const {
return i >= len;
}
bool
Path::isAbsolute() const {
if (path.empty())
return false;
return path[0] == '/';
}
Path
Path::GetRootDirectory() {
Path result;
@ -357,18 +363,22 @@ Path::getLast() const {
}
bool
Path::getFileStatus(FileStatus &info, std::string *ErrStr) const {
struct stat buf;
if (0 != stat(path.c_str(), &buf))
return MakeErrMsg(ErrStr,
path + ": can't get status of file '" + path + "'");
info.fileSize = buf.st_size;
info.modTime.fromEpochTime(buf.st_mtime);
info.mode = buf.st_mode;
info.user = buf.st_uid;
info.group = buf.st_gid;
info.isDir = S_ISDIR(buf.st_mode);
info.isFile = S_ISREG(buf.st_mode);
Path::getFileStatus(FileStatus &info, bool update, std::string *ErrStr) const {
if (status == 0 || update) {
struct stat buf;
if (0 != stat(path.c_str(), &buf))
return MakeErrMsg(ErrStr, path + ": can't get status of file");
if (status == 0)
status = new FileStatus;
status->fileSize = buf.st_size;
status->modTime.fromEpochTime(buf.st_mtime);
status->mode = buf.st_mode;
status->user = buf.st_uid;
status->group = buf.st_gid;
status->isDir = S_ISDIR(buf.st_mode);
status->isFile = S_ISREG(buf.st_mode);
}
info = *status;
return false;
}

41
llvm/lib/System/Win32/Path.inc
View File

@ -105,6 +105,13 @@ Path::isValid() const {
return true;
}
bool
Path::isAbsolute() const {
if (path.length() < 3)
return false;
return path[0] == 'C' && path[1] == ':' && path[2] == '\\';
}
static Path *TempDirectory = NULL;
Path
@ -294,24 +301,30 @@ Path::getLast() const {
}
bool
Path::getFileStatus(FileStatus &info, std::string *ErrStr) const {
WIN32_FILE_ATTRIBUTE_DATA fi;
if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi))
return MakeErrMsg(ErrStr, "getStatusInfo():" + std::string(path) +
": Can't get status: ");
Path::getFileStatus(FileStatus &info, bool update, std::string *ErrStr) const {
if (status == 0 || update) {
WIN32_FILE_ATTRIBUTE_DATA fi;
if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi))
return MakeErrMsg(ErrStr, "getStatusInfo():" + std::string(path) +
": Can't get status: ");
info.fileSize = fi.nFileSizeHigh;
info.fileSize <<= sizeof(fi.nFileSizeHigh)*8;
info.fileSize += fi.nFileSizeLow;
if (status == 0)
status = new FileStatus;
info.mode = fi.dwFileAttributes & FILE_ATTRIBUTE_READONLY ? 0555 : 0777;
info.user = 9999; // Not applicable to Windows, so...
info.group = 9999; // Not applicable to Windows, so...
status->fileSize = fi.nFileSizeHigh;
status->fileSize <<= sizeof(fi.nFileSizeHigh)*8;
status->fileSize += fi.nFileSizeLow;
__int64 ft = *reinterpret_cast<__int64*>(&fi.ftLastWriteTime);
info.modTime.fromWin32Time(ft);
status->mode = fi.dwFileAttributes & FILE_ATTRIBUTE_READONLY ? 0555 : 0777;
status->user = 9999; // Not applicable to Windows, so...
status->group = 9999; // Not applicable to Windows, so...
info.isDir = fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
__int64 ft = *reinterpret_cast<__int64*>(&fi.ftLastWriteTime);
status->modTime.fromWin32Time(ft);
status->isDir = fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
}
info = *status;
return false;
}