X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FPath.cpp;h=bdaa12820b8bdae06d1cc9a0eb240c454987ea5e;hb=52fa0d066a8fb81716713b85841b1aa031dbf8fc;hp=36fb9f3a4bf521fdbbd5a018da5de164573b46df;hpb=e11874f6c5e33f5c2d634bfd33e1ae67c93f9b74;p=oota-llvm.git diff --git a/lib/Support/Path.cpp b/lib/Support/Path.cpp index 36fb9f3a4bf..bdaa12820b8 100644 --- a/lib/Support/Path.cpp +++ b/lib/Support/Path.cpp @@ -11,13 +11,16 @@ // //===----------------------------------------------------------------------===// +#include "llvm/Support/Errc.h" #include "llvm/Support/Path.h" #include "llvm/Support/Endian.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/FileSystem.h" +#include "llvm/Support/Process.h" #include #include #include +#include #if !defined(_MSC_VER) && !defined(__MINGW32__) #include @@ -25,16 +28,18 @@ #include #endif +using namespace llvm; + namespace { using llvm::StringRef; using llvm::sys::path::is_separator; #ifdef LLVM_ON_WIN32 const char *separators = "\\/"; - const char prefered_separator = '\\'; + const char preferred_separator = '\\'; #else const char separators = '/'; - const char prefered_separator = '/'; + const char preferred_separator = '/'; #endif StringRef find_first_component(StringRef path) { @@ -76,7 +81,7 @@ namespace { return path.substr(0, 1); // * {file,directory}name - size_t end = path.find_first_of(separators, 2); + size_t end = path.find_first_of(separators); return path.substr(0, end); } @@ -159,11 +164,73 @@ enum FSEntity { FS_Name }; -// Implemented in Unix/Path.inc and Windows/Path.inc. -static llvm::error_code -createUniqueEntity(const llvm::Twine &Model, int &ResultFD, - llvm::SmallVectorImpl &ResultPath, - bool MakeAbsolute, unsigned Mode, FSEntity Type); +static std::error_code createUniqueEntity(const Twine &Model, int &ResultFD, + SmallVectorImpl &ResultPath, + bool MakeAbsolute, unsigned Mode, + FSEntity Type) { + SmallString<128> ModelStorage; + Model.toVector(ModelStorage); + + if (MakeAbsolute) { + // Make model absolute by prepending a temp directory if it's not already. + if (!sys::path::is_absolute(Twine(ModelStorage))) { + SmallString<128> TDir; + sys::path::system_temp_directory(true, TDir); + sys::path::append(TDir, Twine(ModelStorage)); + ModelStorage.swap(TDir); + } + } + + // From here on, DO NOT modify model. It may be needed if the randomly chosen + // path already exists. + ResultPath = ModelStorage; + // Null terminate. + ResultPath.push_back(0); + ResultPath.pop_back(); + +retry_random_path: + // Replace '%' with random chars. + for (unsigned i = 0, e = ModelStorage.size(); i != e; ++i) { + if (ModelStorage[i] == '%') + ResultPath[i] = "0123456789abcdef"[sys::Process::GetRandomNumber() & 15]; + } + + // Try to open + create the file. + switch (Type) { + case FS_File: { + if (std::error_code EC = + sys::fs::openFileForWrite(Twine(ResultPath.begin()), ResultFD, + sys::fs::F_RW | sys::fs::F_Excl, Mode)) { + if (EC == errc::file_exists) + goto retry_random_path; + return EC; + } + + return std::error_code(); + } + + case FS_Name: { + bool Exists; + std::error_code EC = sys::fs::exists(ResultPath.begin(), Exists); + if (EC) + return EC; + if (Exists) + goto retry_random_path; + return std::error_code(); + } + + case FS_Dir: { + if (std::error_code EC = + sys::fs::create_directory(ResultPath.begin(), false)) { + if (EC == errc::file_exists) + goto retry_random_path; + return EC; + } + return std::error_code(); + } + } + llvm_unreachable("Invalid Type"); +} namespace llvm { namespace sys { @@ -237,22 +304,42 @@ const_iterator &const_iterator::operator++() { return *this; } -const_iterator &const_iterator::operator--() { - // If we're at the end and the previous char was a '/', return '.'. +bool const_iterator::operator==(const const_iterator &RHS) const { + return Path.begin() == RHS.Path.begin() && Position == RHS.Position; +} + +ptrdiff_t const_iterator::operator-(const const_iterator &RHS) const { + return Position - RHS.Position; +} + +reverse_iterator rbegin(StringRef Path) { + reverse_iterator I; + I.Path = Path; + I.Position = Path.size(); + return ++I; +} + +reverse_iterator rend(StringRef Path) { + reverse_iterator I; + I.Path = Path; + I.Component = Path.substr(0, 0); + I.Position = 0; + return I; +} + +reverse_iterator &reverse_iterator::operator++() { + // If we're at the end and the previous char was a '/', return '.' unless + // we are the root path. + size_t root_dir_pos = root_dir_start(Path); if (Position == Path.size() && - Path.size() > 1 && - is_separator(Path[Position - 1]) -#ifdef LLVM_ON_WIN32 - && Path[Position - 2] != ':' -#endif - ) { + Path.size() > root_dir_pos + 1 && + is_separator(Path[Position - 1])) { --Position; Component = "."; return *this; } // Skip separators unless it's the root directory. - size_t root_dir_pos = root_dir_start(Path); size_t end_pos = Position; while(end_pos > 0 && @@ -267,20 +354,12 @@ const_iterator &const_iterator::operator--() { return *this; } -bool const_iterator::operator==(const const_iterator &RHS) const { - return Path.begin() == RHS.Path.begin() && +bool reverse_iterator::operator==(const reverse_iterator &RHS) const { + return Path.begin() == RHS.Path.begin() && Component == RHS.Component && Position == RHS.Position; } -bool const_iterator::operator!=(const const_iterator &RHS) const { - return !(*this == RHS); -} - -ptrdiff_t const_iterator::operator-(const const_iterator &RHS) const { - return Position - RHS.Position; -} - -const StringRef root_path(StringRef path) { +StringRef root_path(StringRef path) { const_iterator b = begin(path), pos = b, e = end(path); @@ -312,7 +391,7 @@ const StringRef root_path(StringRef path) { return StringRef(); } -const StringRef root_name(StringRef path) { +StringRef root_name(StringRef path) { const_iterator b = begin(path), e = end(path); if (b != e) { @@ -334,7 +413,7 @@ const StringRef root_name(StringRef path) { return StringRef(); } -const StringRef root_directory(StringRef path) { +StringRef root_directory(StringRef path) { const_iterator b = begin(path), pos = b, e = end(path); @@ -363,7 +442,7 @@ const StringRef root_directory(StringRef path) { return StringRef(); } -const StringRef relative_path(StringRef path) { +StringRef relative_path(StringRef path) { StringRef root = root_path(path); return path.substr(root.size()); } @@ -402,7 +481,7 @@ void append(SmallVectorImpl &path, const Twine &a, if (!component_has_sep && !(path.empty() || is_root_name)) { // Add a separator. - path.push_back(prefered_separator); + path.push_back(preferred_separator); } path.append(i->begin(), i->end()); @@ -415,7 +494,7 @@ void append(SmallVectorImpl &path, path::append(path, *begin); } -const StringRef parent_path(StringRef path) { +StringRef parent_path(StringRef path) { size_t end_pos = parent_path_end(path); if (end_pos == StringRef::npos) return StringRef(); @@ -448,31 +527,36 @@ void replace_extension(SmallVectorImpl &path, const Twine &extension) { } void native(const Twine &path, SmallVectorImpl &result) { + assert((!path.isSingleStringRef() || + path.getSingleStringRef().data() != result.data()) && + "path and result are not allowed to overlap!"); // Clear result. result.clear(); + path.toVector(result); + native(result); +} + +void native(SmallVectorImpl &Path) { #ifdef LLVM_ON_WIN32 - SmallString<128> path_storage; - StringRef p = path.toStringRef(path_storage); - result.reserve(p.size()); - for (StringRef::const_iterator i = p.begin(), - e = p.end(); - i != e; - ++i) { - if (*i == '/') - result.push_back('\\'); - else - result.push_back(*i); - } + std::replace(Path.begin(), Path.end(), '/', '\\'); #else - path.toVector(result); + for (auto PI = Path.begin(), PE = Path.end(); PI < PE; ++PI) { + if (*PI == '\\') { + auto PN = PI + 1; + if (PN < PE && *PN == '\\') + ++PI; // increment once, the for loop will move over the escaped slash + else + *PI = '/'; + } + } #endif } -const StringRef filename(StringRef path) { - return *(--end(path)); +StringRef filename(StringRef path) { + return *rbegin(path); } -const StringRef stem(StringRef path) { +StringRef stem(StringRef path) { StringRef fname = filename(path); size_t pos = fname.find_last_of('.'); if (pos == StringRef::npos) @@ -485,7 +569,7 @@ const StringRef stem(StringRef path) { return fname.substr(0, pos); } -const StringRef extension(StringRef path) { +StringRef extension(StringRef path) { StringRef fname = filename(path); size_t pos = fname.find_last_of('.'); if (pos == StringRef::npos) @@ -508,55 +592,10 @@ bool is_separator(char value) { } } -void system_temp_directory(bool erasedOnReboot, SmallVectorImpl &result) { - result.clear(); +static const char preferred_separator_string[] = { preferred_separator, '\0' }; -#ifdef __APPLE__ - // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR. - int ConfName = erasedOnReboot? _CS_DARWIN_USER_TEMP_DIR - : _CS_DARWIN_USER_CACHE_DIR; - size_t ConfLen = confstr(ConfName, 0, 0); - if (ConfLen > 0) { - do { - result.resize(ConfLen); - ConfLen = confstr(ConfName, result.data(), result.size()); - } while (ConfLen > 0 && ConfLen != result.size()); - - if (ConfLen > 0) { - assert(result.back() == 0); - result.pop_back(); - return; - } - - result.clear(); - } -#endif - - // Check whether the temporary directory is specified by an environment - // variable. - const char *EnvironmentVariable; -#ifdef LLVM_ON_WIN32 - EnvironmentVariable = "TEMP"; -#else - EnvironmentVariable = "TMPDIR"; -#endif - if (char *RequestedDir = getenv(EnvironmentVariable)) { - result.append(RequestedDir, RequestedDir + strlen(RequestedDir)); - return; - } - - // Fall back to a system default. - const char *DefaultResult; -#ifdef LLVM_ON_WIN32 - (void)erasedOnReboot; - DefaultResult = "C:\\TEMP"; -#else - if (erasedOnReboot) - DefaultResult = "/tmp"; - else - DefaultResult = "/var/tmp"; -#endif - result.append(DefaultResult, DefaultResult + strlen(DefaultResult)); +StringRef get_separator() { + return preferred_separator_string; } bool has_root_name(const Twine &path) { @@ -637,26 +676,30 @@ bool is_relative(const Twine &path) { namespace fs { -// This is a mkostemps with a different pattern. Unfortunatelly OS X (ond *BSD) -// don't have it. We should try using mkostemps on systems that have it. -error_code unique_file(const Twine &Model, int &ResultFD, - SmallVectorImpl &ResultPath, bool MakeAbsolute, - unsigned Mode) { - return createUniqueEntity(Model, ResultFD, ResultPath, MakeAbsolute, Mode, - FS_File); +std::error_code getUniqueID(const Twine Path, UniqueID &Result) { + file_status Status; + std::error_code EC = status(Path, Status); + if (EC) + return EC; + Result = Status.getUniqueID(); + return std::error_code(); +} + +std::error_code createUniqueFile(const Twine &Model, int &ResultFd, + SmallVectorImpl &ResultPath, + unsigned Mode) { + return createUniqueEntity(Model, ResultFd, ResultPath, false, Mode, FS_File); } -// This is a mktemp with a differet pattern. We use createUniqueEntity mostly -// for consistency. We should try using mktemp. -error_code unique_file(const Twine &Model, SmallVectorImpl &ResultPath, - bool MakeAbsolute) { +std::error_code createUniqueFile(const Twine &Model, + SmallVectorImpl &ResultPath) { int Dummy; - return createUniqueEntity(Model, Dummy, ResultPath, MakeAbsolute, 0, FS_Name); + return createUniqueEntity(Model, Dummy, ResultPath, false, 0, FS_Name); } -static error_code createTemporaryFile(const Twine &Model, int &ResultFD, - llvm::SmallVectorImpl &ResultPath, - FSEntity Type) { +static std::error_code +createTemporaryFile(const Twine &Model, int &ResultFD, + llvm::SmallVectorImpl &ResultPath, FSEntity Type) { SmallString<128> Storage; StringRef P = Model.toNullTerminatedStringRef(Storage); assert(P.find_first_of(separators) == StringRef::npos && @@ -666,23 +709,22 @@ static error_code createTemporaryFile(const Twine &Model, int &ResultFD, true, owner_read | owner_write, Type); } -static error_code +static std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, int &ResultFD, - llvm::SmallVectorImpl &ResultPath, - FSEntity Type) { - return createTemporaryFile(Prefix + "-%%%%%%." + Suffix, ResultFD, ResultPath, + llvm::SmallVectorImpl &ResultPath, FSEntity Type) { + const char *Middle = Suffix.empty() ? "-%%%%%%" : "-%%%%%%."; + return createTemporaryFile(Prefix + Middle + Suffix, ResultFD, ResultPath, Type); } - -error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, - int &ResultFD, - SmallVectorImpl &ResultPath) { +std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, + int &ResultFD, + SmallVectorImpl &ResultPath) { return createTemporaryFile(Prefix, Suffix, ResultFD, ResultPath, FS_File); } -error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, - SmallVectorImpl &ResultPath) { +std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, + SmallVectorImpl &ResultPath) { int Dummy; return createTemporaryFile(Prefix, Suffix, Dummy, ResultPath, FS_Name); } @@ -690,14 +732,14 @@ error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, // This is a mkdtemp with a different pattern. We use createUniqueEntity mostly // for consistency. We should try using mkdtemp. -error_code createUniqueDirectory(const Twine &Prefix, - SmallVectorImpl &ResultPath) { +std::error_code createUniqueDirectory(const Twine &Prefix, + SmallVectorImpl &ResultPath) { int Dummy; return createUniqueEntity(Prefix + "-%%%%%%", Dummy, ResultPath, true, 0, FS_Dir); } -error_code make_absolute(SmallVectorImpl &path) { +std::error_code make_absolute(SmallVectorImpl &path) { StringRef p(path.data(), path.size()); bool rootDirectory = path::has_root_directory(p), @@ -709,11 +751,12 @@ error_code make_absolute(SmallVectorImpl &path) { // Already absolute. if (rootName && rootDirectory) - return error_code::success(); + return std::error_code(); // All of the following conditions will need the current directory. SmallString<128> current_dir; - if (error_code ec = current_path(current_dir)) return ec; + if (std::error_code ec = current_path(current_dir)) + return ec; // Relative path. Prepend the current directory. if (!rootName && !rootDirectory) { @@ -721,7 +764,7 @@ error_code make_absolute(SmallVectorImpl &path) { path::append(current_dir, p); // Set path to the result. path.swap(current_dir); - return error_code::success(); + return std::error_code(); } if (!rootName && rootDirectory) { @@ -730,7 +773,7 @@ error_code make_absolute(SmallVectorImpl &path) { path::append(curDirRootName, p); // Set path to the result. path.swap(curDirRootName); - return error_code::success(); + return std::error_code(); } if (rootName && !rootDirectory) { @@ -742,27 +785,68 @@ error_code make_absolute(SmallVectorImpl &path) { SmallString<128> res; path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath); path.swap(res); - return error_code::success(); + return std::error_code(); } llvm_unreachable("All rootName and rootDirectory combinations should have " "occurred above!"); } -error_code create_directories(const Twine &path, bool &existed) { - SmallString<128> path_storage; - StringRef p = path.toStringRef(path_storage); +std::error_code create_directories(const Twine &Path, bool IgnoreExisting) { + SmallString<128> PathStorage; + StringRef P = Path.toStringRef(PathStorage); + + // Be optimistic and try to create the directory + std::error_code EC = create_directory(P, IgnoreExisting); + // If we succeeded, or had any error other than the parent not existing, just + // return it. + if (EC != errc::no_such_file_or_directory) + return EC; + + // We failed because of a no_such_file_or_directory, try to create the + // parent. + StringRef Parent = path::parent_path(P); + if (Parent.empty()) + return EC; - StringRef parent = path::parent_path(p); - if (!parent.empty()) { - bool parent_exists; - if (error_code ec = fs::exists(parent, parent_exists)) return ec; + if ((EC = create_directories(Parent))) + return EC; - if (!parent_exists) - if (error_code ec = create_directories(parent, existed)) return ec; + return create_directory(P, IgnoreExisting); +} + +std::error_code copy_file(const Twine &From, const Twine &To) { + int ReadFD, WriteFD; + if (std::error_code EC = openFileForRead(From, ReadFD)) + return EC; + if (std::error_code EC = openFileForWrite(To, WriteFD, F_None)) { + close(ReadFD); + return EC; } - return create_directory(p, existed); + const size_t BufSize = 4096; + char *Buf = new char[BufSize]; + int BytesRead = 0, BytesWritten = 0; + for (;;) { + BytesRead = read(ReadFD, Buf, BufSize); + if (BytesRead <= 0) + break; + while (BytesRead) { + BytesWritten = write(WriteFD, Buf, BytesRead); + if (BytesWritten < 0) + break; + BytesRead -= BytesWritten; + } + if (BytesWritten < 0) + break; + } + close(ReadFD); + close(WriteFD); + delete[] Buf; + + if (BytesRead < 0 || BytesWritten < 0) + return std::error_code(errno, std::generic_category()); + return std::error_code(); } bool exists(file_status status) { @@ -777,43 +861,30 @@ bool is_directory(file_status status) { return status.type() == file_type::directory_file; } -error_code is_directory(const Twine &path, bool &result) { +std::error_code is_directory(const Twine &path, bool &result) { file_status st; - if (error_code ec = status(path, st)) + if (std::error_code ec = status(path, st)) return ec; result = is_directory(st); - return error_code::success(); + return std::error_code(); } bool is_regular_file(file_status status) { return status.type() == file_type::regular_file; } -error_code is_regular_file(const Twine &path, bool &result) { +std::error_code is_regular_file(const Twine &path, bool &result) { file_status st; - if (error_code ec = status(path, st)) + if (std::error_code ec = status(path, st)) return ec; result = is_regular_file(st); - return error_code::success(); -} - -bool is_symlink(file_status status) { - return status.type() == file_type::symlink_file; -} - -error_code is_symlink(const Twine &path, bool &result) { - file_status st; - if (error_code ec = status(path, st)) - return ec; - result = is_symlink(st); - return error_code::success(); + return std::error_code(); } bool is_other(file_status status) { return exists(status) && !is_regular_file(status) && - !is_directory(status) && - !is_symlink(status); + !is_directory(status); } void directory_entry::replace_filename(const Twine &filename, file_status st) { @@ -824,29 +895,26 @@ void directory_entry::replace_filename(const Twine &filename, file_status st) { Status = st; } -error_code has_magic(const Twine &path, const Twine &magic, bool &result) { - SmallString<32> MagicStorage; - StringRef Magic = magic.toStringRef(MagicStorage); - SmallString<32> Buffer; - - if (error_code ec = get_magic(path, Magic.size(), Buffer)) { - if (ec == errc::value_too_large) { - // Magic.size() > file_size(Path). - result = false; - return error_code::success(); - } - return ec; - } - - result = Magic == Buffer; - return error_code::success(); -} - /// @brief Identify the magic in magic. - file_magic identify_magic(StringRef Magic) { +file_magic identify_magic(StringRef Magic) { if (Magic.size() < 4) return file_magic::unknown; switch ((unsigned char)Magic[0]) { + case 0x00: { + // COFF short import library file + if (Magic[1] == (char)0x00 && Magic[2] == (char)0xff && + Magic[3] == (char)0xff) + return file_magic::coff_import_library; + // Windows resource file + const char Expected[] = { 0, 0, 0, 0, '\x20', 0, 0, 0, '\xff' }; + if (Magic.size() >= sizeof(Expected) && + memcmp(Magic.data(), Expected, sizeof(Expected)) == 0) + return file_magic::windows_resource; + // 0x0000 = COFF unknown machine type + if (Magic[1] == 0) + return file_magic::coff_object; + break; + } case 0xDE: // 0x0B17C0DE = BC wraper if (Magic[1] == (char)0xC0 && Magic[2] == (char)0x17 && Magic[3] == (char)0x0B) @@ -928,6 +996,7 @@ error_code has_magic(const Twine &path, const Twine &magic, bool &result) { case 0x66: // MPS R4000 Windows case 0x50: // mc68K case 0x4c: // 80386 Windows + case 0xc4: // ARMNT Windows if (Magic[1] == 0x01) return file_magic::coff_object; @@ -958,56 +1027,21 @@ error_code has_magic(const Twine &path, const Twine &magic, bool &result) { return file_magic::unknown; } -error_code identify_magic(const Twine &path, file_magic &result) { - SmallString<32> Magic; - error_code ec = get_magic(path, Magic.capacity(), Magic); - if (ec && ec != errc::value_too_large) - return ec; +std::error_code identify_magic(const Twine &Path, file_magic &Result) { + int FD; + if (std::error_code EC = openFileForRead(Path, FD)) + return EC; - result = identify_magic(Magic); - return error_code::success(); -} + char Buffer[32]; + int Length = read(FD, Buffer, sizeof(Buffer)); + if (close(FD) != 0 || Length < 0) + return std::error_code(errno, std::generic_category()); -namespace { -error_code remove_all_r(StringRef path, file_type ft, uint32_t &count) { - if (ft == file_type::directory_file) { - // This code would be a lot better with exceptions ;/. - error_code ec; - directory_iterator i(path, ec); - if (ec) return ec; - for (directory_iterator e; i != e; i.increment(ec)) { - if (ec) return ec; - file_status st; - if (error_code ec = i->status(st)) return ec; - if (error_code ec = remove_all_r(i->path(), st.type(), count)) return ec; - } - bool obviously_this_exists; - if (error_code ec = remove(path, obviously_this_exists)) return ec; - assert(obviously_this_exists); - ++count; // Include the directory itself in the items removed. - } else { - bool obviously_this_exists; - if (error_code ec = remove(path, obviously_this_exists)) return ec; - assert(obviously_this_exists); - ++count; - } - - return error_code::success(); -} -} // end unnamed namespace - -error_code remove_all(const Twine &path, uint32_t &num_removed) { - SmallString<128> path_storage; - StringRef p = path.toStringRef(path_storage); - - file_status fs; - if (error_code ec = status(path, fs)) - return ec; - num_removed = 0; - return remove_all_r(p, fs.type(), num_removed); + Result = identify_magic(StringRef(Buffer, Length)); + return std::error_code(); } -error_code directory_entry::status(file_status &result) const { +std::error_code directory_entry::status(file_status &result) const { return fs::status(Path, result); }