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-rw-r--r--llvm/lib/Support/Path.cpp1248
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diff --git a/llvm/lib/Support/Path.cpp b/llvm/lib/Support/Path.cpp
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+//===-- Path.cpp - Implement OS Path Concept ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the operating system Path API.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Path.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/Signals.h"
+#include <cctype>
+#include <cstring>
+
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
+using namespace llvm;
+using namespace llvm::support::endian;
+
+namespace {
+ using llvm::StringRef;
+ using llvm::sys::path::is_separator;
+ using llvm::sys::path::Style;
+
+ inline Style real_style(Style style) {
+#ifdef _WIN32
+ return (style == Style::posix) ? Style::posix : Style::windows;
+#else
+ return (style == Style::windows) ? Style::windows : Style::posix;
+#endif
+ }
+
+ inline const char *separators(Style style) {
+ if (real_style(style) == Style::windows)
+ return "\\/";
+ return "/";
+ }
+
+ inline char preferred_separator(Style style) {
+ if (real_style(style) == Style::windows)
+ return '\\';
+ return '/';
+ }
+
+ StringRef find_first_component(StringRef path, Style style) {
+ // Look for this first component in the following order.
+ // * empty (in this case we return an empty string)
+ // * either C: or {//,\\}net.
+ // * {/,\}
+ // * {file,directory}name
+
+ if (path.empty())
+ return path;
+
+ if (real_style(style) == Style::windows) {
+ // C:
+ if (path.size() >= 2 &&
+ std::isalpha(static_cast<unsigned char>(path[0])) && path[1] == ':')
+ return path.substr(0, 2);
+ }
+
+ // //net
+ if ((path.size() > 2) && is_separator(path[0], style) &&
+ path[0] == path[1] && !is_separator(path[2], style)) {
+ // Find the next directory separator.
+ size_t end = path.find_first_of(separators(style), 2);
+ return path.substr(0, end);
+ }
+
+ // {/,\}
+ if (is_separator(path[0], style))
+ return path.substr(0, 1);
+
+ // * {file,directory}name
+ size_t end = path.find_first_of(separators(style));
+ return path.substr(0, end);
+ }
+
+ // Returns the first character of the filename in str. For paths ending in
+ // '/', it returns the position of the '/'.
+ size_t filename_pos(StringRef str, Style style) {
+ if (str.size() > 0 && is_separator(str[str.size() - 1], style))
+ return str.size() - 1;
+
+ size_t pos = str.find_last_of(separators(style), str.size() - 1);
+
+ if (real_style(style) == Style::windows) {
+ if (pos == StringRef::npos)
+ pos = str.find_last_of(':', str.size() - 2);
+ }
+
+ if (pos == StringRef::npos || (pos == 1 && is_separator(str[0], style)))
+ return 0;
+
+ return pos + 1;
+ }
+
+ // Returns the position of the root directory in str. If there is no root
+ // directory in str, it returns StringRef::npos.
+ size_t root_dir_start(StringRef str, Style style) {
+ // case "c:/"
+ if (real_style(style) == Style::windows) {
+ if (str.size() > 2 && str[1] == ':' && is_separator(str[2], style))
+ return 2;
+ }
+
+ // case "//net"
+ if (str.size() > 3 && is_separator(str[0], style) && str[0] == str[1] &&
+ !is_separator(str[2], style)) {
+ return str.find_first_of(separators(style), 2);
+ }
+
+ // case "/"
+ if (str.size() > 0 && is_separator(str[0], style))
+ return 0;
+
+ return StringRef::npos;
+ }
+
+ // Returns the position past the end of the "parent path" of path. The parent
+ // path will not end in '/', unless the parent is the root directory. If the
+ // path has no parent, 0 is returned.
+ size_t parent_path_end(StringRef path, Style style) {
+ size_t end_pos = filename_pos(path, style);
+
+ bool filename_was_sep =
+ path.size() > 0 && is_separator(path[end_pos], style);
+
+ // Skip separators until we reach root dir (or the start of the string).
+ size_t root_dir_pos = root_dir_start(path, style);
+ while (end_pos > 0 &&
+ (root_dir_pos == StringRef::npos || end_pos > root_dir_pos) &&
+ is_separator(path[end_pos - 1], style))
+ --end_pos;
+
+ if (end_pos == root_dir_pos && !filename_was_sep) {
+ // We've reached the root dir and the input path was *not* ending in a
+ // sequence of slashes. Include the root dir in the parent path.
+ return root_dir_pos + 1;
+ }
+
+ // Otherwise, just include before the last slash.
+ return end_pos;
+ }
+} // end unnamed namespace
+
+enum FSEntity {
+ FS_Dir,
+ FS_File,
+ FS_Name
+};
+
+static std::error_code
+createUniqueEntity(const Twine &Model, int &ResultFD,
+ SmallVectorImpl<char> &ResultPath, bool MakeAbsolute,
+ unsigned Mode, FSEntity Type,
+ sys::fs::OpenFlags Flags = sys::fs::OF_None) {
+
+ // Limit the number of attempts we make, so that we don't infinite loop. E.g.
+ // "permission denied" could be for a specific file (so we retry with a
+ // different name) or for the whole directory (retry would always fail).
+ // Checking which is racy, so we try a number of times, then give up.
+ std::error_code EC;
+ for (int Retries = 128; Retries > 0; --Retries) {
+ sys::fs::createUniquePath(Model, ResultPath, MakeAbsolute);
+ // Try to open + create the file.
+ switch (Type) {
+ case FS_File: {
+ EC = sys::fs::openFileForReadWrite(Twine(ResultPath.begin()), ResultFD,
+ sys::fs::CD_CreateNew, Flags, Mode);
+ if (EC) {
+ // errc::permission_denied happens on Windows when we try to open a file
+ // that has been marked for deletion.
+ if (EC == errc::file_exists || EC == errc::permission_denied)
+ continue;
+ return EC;
+ }
+
+ return std::error_code();
+ }
+
+ case FS_Name: {
+ EC = sys::fs::access(ResultPath.begin(), sys::fs::AccessMode::Exist);
+ if (EC == errc::no_such_file_or_directory)
+ return std::error_code();
+ if (EC)
+ return EC;
+ continue;
+ }
+
+ case FS_Dir: {
+ EC = sys::fs::create_directory(ResultPath.begin(), false);
+ if (EC) {
+ if (EC == errc::file_exists)
+ continue;
+ return EC;
+ }
+ return std::error_code();
+ }
+ }
+ llvm_unreachable("Invalid Type");
+ }
+ return EC;
+}
+
+namespace llvm {
+namespace sys {
+namespace path {
+
+const_iterator begin(StringRef path, Style style) {
+ const_iterator i;
+ i.Path = path;
+ i.Component = find_first_component(path, style);
+ i.Position = 0;
+ i.S = style;
+ return i;
+}
+
+const_iterator end(StringRef path) {
+ const_iterator i;
+ i.Path = path;
+ i.Position = path.size();
+ return i;
+}
+
+const_iterator &const_iterator::operator++() {
+ assert(Position < Path.size() && "Tried to increment past end!");
+
+ // Increment Position to past the current component
+ Position += Component.size();
+
+ // Check for end.
+ if (Position == Path.size()) {
+ Component = StringRef();
+ return *this;
+ }
+
+ // Both POSIX and Windows treat paths that begin with exactly two separators
+ // specially.
+ bool was_net = Component.size() > 2 && is_separator(Component[0], S) &&
+ Component[1] == Component[0] && !is_separator(Component[2], S);
+
+ // Handle separators.
+ if (is_separator(Path[Position], S)) {
+ // Root dir.
+ if (was_net ||
+ // c:/
+ (real_style(S) == Style::windows && Component.endswith(":"))) {
+ Component = Path.substr(Position, 1);
+ return *this;
+ }
+
+ // Skip extra separators.
+ while (Position != Path.size() && is_separator(Path[Position], S)) {
+ ++Position;
+ }
+
+ // Treat trailing '/' as a '.', unless it is the root dir.
+ if (Position == Path.size() && Component != "/") {
+ --Position;
+ Component = ".";
+ return *this;
+ }
+ }
+
+ // Find next component.
+ size_t end_pos = Path.find_first_of(separators(S), Position);
+ Component = Path.slice(Position, end_pos);
+
+ return *this;
+}
+
+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, Style style) {
+ reverse_iterator I;
+ I.Path = Path;
+ I.Position = Path.size();
+ I.S = style;
+ ++I;
+ 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++() {
+ size_t root_dir_pos = root_dir_start(Path, S);
+
+ // Skip separators unless it's the root directory.
+ size_t end_pos = Position;
+ while (end_pos > 0 && (end_pos - 1) != root_dir_pos &&
+ is_separator(Path[end_pos - 1], S))
+ --end_pos;
+
+ // Treat trailing '/' as a '.', unless it is the root dir.
+ if (Position == Path.size() && !Path.empty() &&
+ is_separator(Path.back(), S) &&
+ (root_dir_pos == StringRef::npos || end_pos - 1 > root_dir_pos)) {
+ --Position;
+ Component = ".";
+ return *this;
+ }
+
+ // Find next separator.
+ size_t start_pos = filename_pos(Path.substr(0, end_pos), S);
+ Component = Path.slice(start_pos, end_pos);
+ Position = start_pos;
+ return *this;
+}
+
+bool reverse_iterator::operator==(const reverse_iterator &RHS) const {
+ return Path.begin() == RHS.Path.begin() && Component == RHS.Component &&
+ Position == RHS.Position;
+}
+
+ptrdiff_t reverse_iterator::operator-(const reverse_iterator &RHS) const {
+ return Position - RHS.Position;
+}
+
+StringRef root_path(StringRef path, Style style) {
+ const_iterator b = begin(path, style), pos = b, e = end(path);
+ if (b != e) {
+ bool has_net =
+ b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
+ bool has_drive = (real_style(style) == Style::windows) && b->endswith(":");
+
+ if (has_net || has_drive) {
+ if ((++pos != e) && is_separator((*pos)[0], style)) {
+ // {C:/,//net/}, so get the first two components.
+ return path.substr(0, b->size() + pos->size());
+ } else {
+ // just {C:,//net}, return the first component.
+ return *b;
+ }
+ }
+
+ // POSIX style root directory.
+ if (is_separator((*b)[0], style)) {
+ return *b;
+ }
+ }
+
+ return StringRef();
+}
+
+StringRef root_name(StringRef path, Style style) {
+ const_iterator b = begin(path, style), e = end(path);
+ if (b != e) {
+ bool has_net =
+ b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
+ bool has_drive = (real_style(style) == Style::windows) && b->endswith(":");
+
+ if (has_net || has_drive) {
+ // just {C:,//net}, return the first component.
+ return *b;
+ }
+ }
+
+ // No path or no name.
+ return StringRef();
+}
+
+StringRef root_directory(StringRef path, Style style) {
+ const_iterator b = begin(path, style), pos = b, e = end(path);
+ if (b != e) {
+ bool has_net =
+ b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
+ bool has_drive = (real_style(style) == Style::windows) && b->endswith(":");
+
+ if ((has_net || has_drive) &&
+ // {C:,//net}, skip to the next component.
+ (++pos != e) && is_separator((*pos)[0], style)) {
+ return *pos;
+ }
+
+ // POSIX style root directory.
+ if (!has_net && is_separator((*b)[0], style)) {
+ return *b;
+ }
+ }
+
+ // No path or no root.
+ return StringRef();
+}
+
+StringRef relative_path(StringRef path, Style style) {
+ StringRef root = root_path(path, style);
+ return path.substr(root.size());
+}
+
+void append(SmallVectorImpl<char> &path, Style style, const Twine &a,
+ const Twine &b, const Twine &c, const Twine &d) {
+ SmallString<32> a_storage;
+ SmallString<32> b_storage;
+ SmallString<32> c_storage;
+ SmallString<32> d_storage;
+
+ SmallVector<StringRef, 4> components;
+ if (!a.isTriviallyEmpty()) components.push_back(a.toStringRef(a_storage));
+ if (!b.isTriviallyEmpty()) components.push_back(b.toStringRef(b_storage));
+ if (!c.isTriviallyEmpty()) components.push_back(c.toStringRef(c_storage));
+ if (!d.isTriviallyEmpty()) components.push_back(d.toStringRef(d_storage));
+
+ for (auto &component : components) {
+ bool path_has_sep =
+ !path.empty() && is_separator(path[path.size() - 1], style);
+ if (path_has_sep) {
+ // Strip separators from beginning of component.
+ size_t loc = component.find_first_not_of(separators(style));
+ StringRef c = component.substr(loc);
+
+ // Append it.
+ path.append(c.begin(), c.end());
+ continue;
+ }
+
+ bool component_has_sep =
+ !component.empty() && is_separator(component[0], style);
+ if (!component_has_sep &&
+ !(path.empty() || has_root_name(component, style))) {
+ // Add a separator.
+ path.push_back(preferred_separator(style));
+ }
+
+ path.append(component.begin(), component.end());
+ }
+}
+
+void append(SmallVectorImpl<char> &path, const Twine &a, const Twine &b,
+ const Twine &c, const Twine &d) {
+ append(path, Style::native, a, b, c, d);
+}
+
+void append(SmallVectorImpl<char> &path, const_iterator begin,
+ const_iterator end, Style style) {
+ for (; begin != end; ++begin)
+ path::append(path, style, *begin);
+}
+
+StringRef parent_path(StringRef path, Style style) {
+ size_t end_pos = parent_path_end(path, style);
+ if (end_pos == StringRef::npos)
+ return StringRef();
+ else
+ return path.substr(0, end_pos);
+}
+
+void remove_filename(SmallVectorImpl<char> &path, Style style) {
+ size_t end_pos = parent_path_end(StringRef(path.begin(), path.size()), style);
+ if (end_pos != StringRef::npos)
+ path.set_size(end_pos);
+}
+
+void replace_extension(SmallVectorImpl<char> &path, const Twine &extension,
+ Style style) {
+ StringRef p(path.begin(), path.size());
+ SmallString<32> ext_storage;
+ StringRef ext = extension.toStringRef(ext_storage);
+
+ // Erase existing extension.
+ size_t pos = p.find_last_of('.');
+ if (pos != StringRef::npos && pos >= filename_pos(p, style))
+ path.set_size(pos);
+
+ // Append '.' if needed.
+ if (ext.size() > 0 && ext[0] != '.')
+ path.push_back('.');
+
+ // Append extension.
+ path.append(ext.begin(), ext.end());
+}
+
+void replace_path_prefix(SmallVectorImpl<char> &Path,
+ const StringRef &OldPrefix, const StringRef &NewPrefix,
+ Style style) {
+ if (OldPrefix.empty() && NewPrefix.empty())
+ return;
+
+ StringRef OrigPath(Path.begin(), Path.size());
+ if (!OrigPath.startswith(OldPrefix))
+ return;
+
+ // If prefixes have the same size we can simply copy the new one over.
+ if (OldPrefix.size() == NewPrefix.size()) {
+ llvm::copy(NewPrefix, Path.begin());
+ return;
+ }
+
+ StringRef RelPath = OrigPath.substr(OldPrefix.size());
+ SmallString<256> NewPath;
+ path::append(NewPath, style, NewPrefix);
+ path::append(NewPath, style, RelPath);
+ Path.swap(NewPath);
+}
+
+void native(const Twine &path, SmallVectorImpl<char> &result, Style style) {
+ 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, style);
+}
+
+void native(SmallVectorImpl<char> &Path, Style style) {
+ if (Path.empty())
+ return;
+ if (real_style(style) == Style::windows) {
+ std::replace(Path.begin(), Path.end(), '/', '\\');
+ if (Path[0] == '~' && (Path.size() == 1 || is_separator(Path[1], style))) {
+ SmallString<128> PathHome;
+ home_directory(PathHome);
+ PathHome.append(Path.begin() + 1, Path.end());
+ Path = PathHome;
+ }
+ } else {
+ 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 = '/';
+ }
+ }
+ }
+}
+
+std::string convert_to_slash(StringRef path, Style style) {
+ if (real_style(style) != Style::windows)
+ return path;
+
+ std::string s = path.str();
+ std::replace(s.begin(), s.end(), '\\', '/');
+ return s;
+}
+
+StringRef filename(StringRef path, Style style) { return *rbegin(path, style); }
+
+StringRef stem(StringRef path, Style style) {
+ StringRef fname = filename(path, style);
+ size_t pos = fname.find_last_of('.');
+ if (pos == StringRef::npos)
+ return fname;
+ else
+ if ((fname.size() == 1 && fname == ".") ||
+ (fname.size() == 2 && fname == ".."))
+ return fname;
+ else
+ return fname.substr(0, pos);
+}
+
+StringRef extension(StringRef path, Style style) {
+ StringRef fname = filename(path, style);
+ size_t pos = fname.find_last_of('.');
+ if (pos == StringRef::npos)
+ return StringRef();
+ else
+ if ((fname.size() == 1 && fname == ".") ||
+ (fname.size() == 2 && fname == ".."))
+ return StringRef();
+ else
+ return fname.substr(pos);
+}
+
+bool is_separator(char value, Style style) {
+ if (value == '/')
+ return true;
+ if (real_style(style) == Style::windows)
+ return value == '\\';
+ return false;
+}
+
+StringRef get_separator(Style style) {
+ if (real_style(style) == Style::windows)
+ return "\\";
+ return "/";
+}
+
+bool has_root_name(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !root_name(p, style).empty();
+}
+
+bool has_root_directory(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !root_directory(p, style).empty();
+}
+
+bool has_root_path(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !root_path(p, style).empty();
+}
+
+bool has_relative_path(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !relative_path(p, style).empty();
+}
+
+bool has_filename(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !filename(p, style).empty();
+}
+
+bool has_parent_path(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !parent_path(p, style).empty();
+}
+
+bool has_stem(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !stem(p, style).empty();
+}
+
+bool has_extension(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !extension(p, style).empty();
+}
+
+bool is_absolute(const Twine &path, Style style) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ bool rootDir = has_root_directory(p, style);
+ bool rootName =
+ (real_style(style) != Style::windows) || has_root_name(p, style);
+
+ return rootDir && rootName;
+}
+
+bool is_relative(const Twine &path, Style style) {
+ return !is_absolute(path, style);
+}
+
+StringRef remove_leading_dotslash(StringRef Path, Style style) {
+ // Remove leading "./" (or ".//" or "././" etc.)
+ while (Path.size() > 2 && Path[0] == '.' && is_separator(Path[1], style)) {
+ Path = Path.substr(2);
+ while (Path.size() > 0 && is_separator(Path[0], style))
+ Path = Path.substr(1);
+ }
+ return Path;
+}
+
+static SmallString<256> remove_dots(StringRef path, bool remove_dot_dot,
+ Style style) {
+ SmallVector<StringRef, 16> components;
+
+ // Skip the root path, then look for traversal in the components.
+ StringRef rel = path::relative_path(path, style);
+ for (StringRef C :
+ llvm::make_range(path::begin(rel, style), path::end(rel))) {
+ if (C == ".")
+ continue;
+ // Leading ".." will remain in the path unless it's at the root.
+ if (remove_dot_dot && C == "..") {
+ if (!components.empty() && components.back() != "..") {
+ components.pop_back();
+ continue;
+ }
+ if (path::is_absolute(path, style))
+ continue;
+ }
+ components.push_back(C);
+ }
+
+ SmallString<256> buffer = path::root_path(path, style);
+ for (StringRef C : components)
+ path::append(buffer, style, C);
+ return buffer;
+}
+
+bool remove_dots(SmallVectorImpl<char> &path, bool remove_dot_dot,
+ Style style) {
+ StringRef p(path.data(), path.size());
+
+ SmallString<256> result = remove_dots(p, remove_dot_dot, style);
+ if (result == path)
+ return false;
+
+ path.swap(result);
+ return true;
+}
+
+} // end namespace path
+
+namespace fs {
+
+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();
+}
+
+void createUniquePath(const Twine &Model, SmallVectorImpl<char> &ResultPath,
+ bool MakeAbsolute) {
+ 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);
+ }
+ }
+
+ ResultPath = ModelStorage;
+ ResultPath.push_back(0);
+ ResultPath.pop_back();
+
+ // Replace '%' with random chars.
+ for (unsigned i = 0, e = ModelStorage.size(); i != e; ++i) {
+ if (ModelStorage[i] == '%')
+ ResultPath[i] = "0123456789abcdef"[sys::Process::GetRandomNumber() & 15];
+ }
+}
+
+std::error_code createUniqueFile(const Twine &Model, int &ResultFd,
+ SmallVectorImpl<char> &ResultPath,
+ unsigned Mode) {
+ return createUniqueEntity(Model, ResultFd, ResultPath, false, Mode, FS_File);
+}
+
+static std::error_code createUniqueFile(const Twine &Model, int &ResultFd,
+ SmallVectorImpl<char> &ResultPath,
+ unsigned Mode, OpenFlags Flags) {
+ return createUniqueEntity(Model, ResultFd, ResultPath, false, Mode, FS_File,
+ Flags);
+}
+
+std::error_code createUniqueFile(const Twine &Model,
+ SmallVectorImpl<char> &ResultPath,
+ unsigned Mode) {
+ int FD;
+ auto EC = createUniqueFile(Model, FD, ResultPath, Mode);
+ if (EC)
+ return EC;
+ // FD is only needed to avoid race conditions. Close it right away.
+ close(FD);
+ return EC;
+}
+
+static std::error_code
+createTemporaryFile(const Twine &Model, int &ResultFD,
+ llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type) {
+ SmallString<128> Storage;
+ StringRef P = Model.toNullTerminatedStringRef(Storage);
+ assert(P.find_first_of(separators(Style::native)) == StringRef::npos &&
+ "Model must be a simple filename.");
+ // Use P.begin() so that createUniqueEntity doesn't need to recreate Storage.
+ return createUniqueEntity(P.begin(), ResultFD, ResultPath, true,
+ owner_read | owner_write, Type);
+}
+
+static std::error_code
+createTemporaryFile(const Twine &Prefix, StringRef Suffix, int &ResultFD,
+ llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type) {
+ const char *Middle = Suffix.empty() ? "-%%%%%%" : "-%%%%%%.";
+ return createTemporaryFile(Prefix + Middle + Suffix, ResultFD, ResultPath,
+ Type);
+}
+
+std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
+ int &ResultFD,
+ SmallVectorImpl<char> &ResultPath) {
+ return createTemporaryFile(Prefix, Suffix, ResultFD, ResultPath, FS_File);
+}
+
+std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
+ SmallVectorImpl<char> &ResultPath) {
+ int FD;
+ auto EC = createTemporaryFile(Prefix, Suffix, FD, ResultPath);
+ if (EC)
+ return EC;
+ // FD is only needed to avoid race conditions. Close it right away.
+ close(FD);
+ return EC;
+}
+
+
+// This is a mkdtemp with a different pattern. We use createUniqueEntity mostly
+// for consistency. We should try using mkdtemp.
+std::error_code createUniqueDirectory(const Twine &Prefix,
+ SmallVectorImpl<char> &ResultPath) {
+ int Dummy;
+ return createUniqueEntity(Prefix + "-%%%%%%", Dummy, ResultPath, true, 0,
+ FS_Dir);
+}
+
+std::error_code
+getPotentiallyUniqueFileName(const Twine &Model,
+ SmallVectorImpl<char> &ResultPath) {
+ int Dummy;
+ return createUniqueEntity(Model, Dummy, ResultPath, false, 0, FS_Name);
+}
+
+std::error_code
+getPotentiallyUniqueTempFileName(const Twine &Prefix, StringRef Suffix,
+ SmallVectorImpl<char> &ResultPath) {
+ int Dummy;
+ return createTemporaryFile(Prefix, Suffix, Dummy, ResultPath, FS_Name);
+}
+
+void make_absolute(const Twine &current_directory,
+ SmallVectorImpl<char> &path) {
+ StringRef p(path.data(), path.size());
+
+ bool rootDirectory = path::has_root_directory(p);
+ bool rootName = path::has_root_name(p);
+
+ // Already absolute.
+ if ((rootName || real_style(Style::native) != Style::windows) &&
+ rootDirectory)
+ return;
+
+ // All of the following conditions will need the current directory.
+ SmallString<128> current_dir;
+ current_directory.toVector(current_dir);
+
+ // Relative path. Prepend the current directory.
+ if (!rootName && !rootDirectory) {
+ // Append path to the current directory.
+ path::append(current_dir, p);
+ // Set path to the result.
+ path.swap(current_dir);
+ return;
+ }
+
+ if (!rootName && rootDirectory) {
+ StringRef cdrn = path::root_name(current_dir);
+ SmallString<128> curDirRootName(cdrn.begin(), cdrn.end());
+ path::append(curDirRootName, p);
+ // Set path to the result.
+ path.swap(curDirRootName);
+ return;
+ }
+
+ if (rootName && !rootDirectory) {
+ StringRef pRootName = path::root_name(p);
+ StringRef bRootDirectory = path::root_directory(current_dir);
+ StringRef bRelativePath = path::relative_path(current_dir);
+ StringRef pRelativePath = path::relative_path(p);
+
+ SmallString<128> res;
+ path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath);
+ path.swap(res);
+ return;
+ }
+
+ llvm_unreachable("All rootName and rootDirectory combinations should have "
+ "occurred above!");
+}
+
+std::error_code make_absolute(SmallVectorImpl<char> &path) {
+ if (path::is_absolute(path))
+ return {};
+
+ SmallString<128> current_dir;
+ if (std::error_code ec = current_path(current_dir))
+ return ec;
+
+ make_absolute(current_dir, path);
+ return {};
+}
+
+std::error_code create_directories(const Twine &Path, bool IgnoreExisting,
+ perms Perms) {
+ SmallString<128> PathStorage;
+ StringRef P = Path.toStringRef(PathStorage);
+
+ // Be optimistic and try to create the directory
+ std::error_code EC = create_directory(P, IgnoreExisting, Perms);
+ // 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;
+
+ if ((EC = create_directories(Parent, IgnoreExisting, Perms)))
+ return EC;
+
+ return create_directory(P, IgnoreExisting, Perms);
+}
+
+static std::error_code copy_file_internal(int ReadFD, int WriteFD) {
+ 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;
+ }
+ delete[] Buf;
+
+ if (BytesRead < 0 || BytesWritten < 0)
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+}
+
+#ifndef __APPLE__
+std::error_code copy_file(const Twine &From, const Twine &To) {
+ int ReadFD, WriteFD;
+ if (std::error_code EC = openFileForRead(From, ReadFD, OF_None))
+ return EC;
+ if (std::error_code EC =
+ openFileForWrite(To, WriteFD, CD_CreateAlways, OF_None)) {
+ close(ReadFD);
+ return EC;
+ }
+
+ std::error_code EC = copy_file_internal(ReadFD, WriteFD);
+
+ close(ReadFD);
+ close(WriteFD);
+
+ return EC;
+}
+#endif
+
+std::error_code copy_file(const Twine &From, int ToFD) {
+ int ReadFD;
+ if (std::error_code EC = openFileForRead(From, ReadFD, OF_None))
+ return EC;
+
+ std::error_code EC = copy_file_internal(ReadFD, ToFD);
+
+ close(ReadFD);
+
+ return EC;
+}
+
+ErrorOr<MD5::MD5Result> md5_contents(int FD) {
+ MD5 Hash;
+
+ constexpr size_t BufSize = 4096;
+ std::vector<uint8_t> Buf(BufSize);
+ int BytesRead = 0;
+ for (;;) {
+ BytesRead = read(FD, Buf.data(), BufSize);
+ if (BytesRead <= 0)
+ break;
+ Hash.update(makeArrayRef(Buf.data(), BytesRead));
+ }
+
+ if (BytesRead < 0)
+ return std::error_code(errno, std::generic_category());
+ MD5::MD5Result Result;
+ Hash.final(Result);
+ return Result;
+}
+
+ErrorOr<MD5::MD5Result> md5_contents(const Twine &Path) {
+ int FD;
+ if (auto EC = openFileForRead(Path, FD, OF_None))
+ return EC;
+
+ auto Result = md5_contents(FD);
+ close(FD);
+ return Result;
+}
+
+bool exists(const basic_file_status &status) {
+ return status_known(status) && status.type() != file_type::file_not_found;
+}
+
+bool status_known(const basic_file_status &s) {
+ return s.type() != file_type::status_error;
+}
+
+file_type get_file_type(const Twine &Path, bool Follow) {
+ file_status st;
+ if (status(Path, st, Follow))
+ return file_type::status_error;
+ return st.type();
+}
+
+bool is_directory(const basic_file_status &status) {
+ return status.type() == file_type::directory_file;
+}
+
+std::error_code is_directory(const Twine &path, bool &result) {
+ file_status st;
+ if (std::error_code ec = status(path, st))
+ return ec;
+ result = is_directory(st);
+ return std::error_code();
+}
+
+bool is_regular_file(const basic_file_status &status) {
+ return status.type() == file_type::regular_file;
+}
+
+std::error_code is_regular_file(const Twine &path, bool &result) {
+ file_status st;
+ if (std::error_code ec = status(path, st))
+ return ec;
+ result = is_regular_file(st);
+ return std::error_code();
+}
+
+bool is_symlink_file(const basic_file_status &status) {
+ return status.type() == file_type::symlink_file;
+}
+
+std::error_code is_symlink_file(const Twine &path, bool &result) {
+ file_status st;
+ if (std::error_code ec = status(path, st, false))
+ return ec;
+ result = is_symlink_file(st);
+ return std::error_code();
+}
+
+bool is_other(const basic_file_status &status) {
+ return exists(status) &&
+ !is_regular_file(status) &&
+ !is_directory(status);
+}
+
+std::error_code is_other(const Twine &Path, bool &Result) {
+ file_status FileStatus;
+ if (std::error_code EC = status(Path, FileStatus))
+ return EC;
+ Result = is_other(FileStatus);
+ return std::error_code();
+}
+
+void directory_entry::replace_filename(const Twine &Filename, file_type Type,
+ basic_file_status Status) {
+ SmallString<128> PathStr = path::parent_path(Path);
+ path::append(PathStr, Filename);
+ this->Path = PathStr.str();
+ this->Type = Type;
+ this->Status = Status;
+}
+
+ErrorOr<perms> getPermissions(const Twine &Path) {
+ file_status Status;
+ if (std::error_code EC = status(Path, Status))
+ return EC;
+
+ return Status.permissions();
+}
+
+} // end namespace fs
+} // end namespace sys
+} // end namespace llvm
+
+// Include the truly platform-specific parts.
+#if defined(LLVM_ON_UNIX)
+#include "Unix/Path.inc"
+#endif
+#if defined(_WIN32)
+#include "Windows/Path.inc"
+#endif
+
+namespace llvm {
+namespace sys {
+namespace fs {
+TempFile::TempFile(StringRef Name, int FD) : TmpName(Name), FD(FD) {}
+TempFile::TempFile(TempFile &&Other) { *this = std::move(Other); }
+TempFile &TempFile::operator=(TempFile &&Other) {
+ TmpName = std::move(Other.TmpName);
+ FD = Other.FD;
+ Other.Done = true;
+ Other.FD = -1;
+ return *this;
+}
+
+TempFile::~TempFile() { assert(Done); }
+
+Error TempFile::discard() {
+ Done = true;
+ if (FD != -1 && close(FD) == -1) {
+ std::error_code EC = std::error_code(errno, std::generic_category());
+ return errorCodeToError(EC);
+ }
+ FD = -1;
+
+#ifdef _WIN32
+ // On windows closing will remove the file.
+ TmpName = "";
+ return Error::success();
+#else
+ // Always try to close and remove.
+ std::error_code RemoveEC;
+ if (!TmpName.empty()) {
+ RemoveEC = fs::remove(TmpName);
+ sys::DontRemoveFileOnSignal(TmpName);
+ if (!RemoveEC)
+ TmpName = "";
+ }
+ return errorCodeToError(RemoveEC);
+#endif
+}
+
+Error TempFile::keep(const Twine &Name) {
+ assert(!Done);
+ Done = true;
+ // Always try to close and rename.
+#ifdef _WIN32
+ // If we can't cancel the delete don't rename.
+ auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
+ std::error_code RenameEC = setDeleteDisposition(H, false);
+ if (!RenameEC) {
+ RenameEC = rename_fd(FD, Name);
+ // If rename failed because it's cross-device, copy instead
+ if (RenameEC ==
+ std::error_code(ERROR_NOT_SAME_DEVICE, std::system_category())) {
+ RenameEC = copy_file(TmpName, Name);
+ setDeleteDisposition(H, true);
+ }
+ }
+
+ // If we can't rename, discard the temporary file.
+ if (RenameEC)
+ setDeleteDisposition(H, true);
+#else
+ std::error_code RenameEC = fs::rename(TmpName, Name);
+ if (RenameEC) {
+ // If we can't rename, try to copy to work around cross-device link issues.
+ RenameEC = sys::fs::copy_file(TmpName, Name);
+ // If we can't rename or copy, discard the temporary file.
+ if (RenameEC)
+ remove(TmpName);
+ }
+ sys::DontRemoveFileOnSignal(TmpName);
+#endif
+
+ if (!RenameEC)
+ TmpName = "";
+
+ if (close(FD) == -1) {
+ std::error_code EC(errno, std::generic_category());
+ return errorCodeToError(EC);
+ }
+ FD = -1;
+
+ return errorCodeToError(RenameEC);
+}
+
+Error TempFile::keep() {
+ assert(!Done);
+ Done = true;
+
+#ifdef _WIN32
+ auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
+ if (std::error_code EC = setDeleteDisposition(H, false))
+ return errorCodeToError(EC);
+#else
+ sys::DontRemoveFileOnSignal(TmpName);
+#endif
+
+ TmpName = "";
+
+ if (close(FD) == -1) {
+ std::error_code EC(errno, std::generic_category());
+ return errorCodeToError(EC);
+ }
+ FD = -1;
+
+ return Error::success();
+}
+
+Expected<TempFile> TempFile::create(const Twine &Model, unsigned Mode) {
+ int FD;
+ SmallString<128> ResultPath;
+ if (std::error_code EC =
+ createUniqueFile(Model, FD, ResultPath, Mode, OF_Delete))
+ return errorCodeToError(EC);
+
+ TempFile Ret(ResultPath, FD);
+#ifndef _WIN32
+ if (sys::RemoveFileOnSignal(ResultPath)) {
+ // Make sure we delete the file when RemoveFileOnSignal fails.
+ consumeError(Ret.discard());
+ std::error_code EC(errc::operation_not_permitted);
+ return errorCodeToError(EC);
+ }
+#endif
+ return std::move(Ret);
+}
+}
+
+} // end namsspace sys
+} // end namespace llvm
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 15:28:31 +0000