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-rw-r--r--lib/Support/PathV2.cpp774
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diff --git a/lib/Support/PathV2.cpp b/lib/Support/PathV2.cpp
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+//===-- PathV2.cpp - Implement OS Path 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 implements the operating system PathV2 API.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/PathV2.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <cctype>
+#include <cstdio>
+#include <cstring>
+
+namespace {
+ using llvm::StringRef;
+ using llvm::sys::path::is_separator;
+
+#ifdef LLVM_ON_WIN32
+ const StringRef separators = "\\/";
+ const char prefered_separator = '\\';
+#else
+ const StringRef separators = "/";
+ const char prefered_separator = '/';
+#endif
+
+ const llvm::error_code success;
+
+ StringRef find_first_component(StringRef path) {
+ // 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;
+
+#ifdef LLVM_ON_WIN32
+ // C:
+ if (path.size() >= 2 && std::isalpha(path[0]) && path[1] == ':')
+ return path.substr(0, 2);
+#endif
+
+ // //net
+ if ((path.size() > 2) &&
+ is_separator(path[0]) &&
+ path[0] == path[1] &&
+ !is_separator(path[2])) {
+ // Find the next directory separator.
+ size_t end = path.find_first_of(separators, 2);
+ return path.substr(0, end);
+ }
+
+ // {/,\}
+ if (is_separator(path[0]))
+ return path.substr(0, 1);
+
+ if (path.startswith(".."))
+ return path.substr(0, 2);
+
+ if (path[0] == '.')
+ return path.substr(0, 1);
+
+ // * {file,directory}name
+ size_t end = path.find_first_of(separators, 2);
+ return path.substr(0, end);
+ }
+
+ size_t filename_pos(StringRef str) {
+ if (str.size() == 2 &&
+ is_separator(str[0]) &&
+ str[0] == str[1])
+ return 0;
+
+ if (str.size() > 0 && is_separator(str[str.size() - 1]))
+ return str.size() - 1;
+
+ size_t pos = str.find_last_of(separators, str.size() - 1);
+
+#ifdef LLVM_ON_WIN32
+ if (pos == StringRef::npos)
+ pos = str.find_last_of(':', str.size() - 2);
+#endif
+
+ if (pos == StringRef::npos ||
+ (pos == 1 && is_separator(str[0])))
+ return 0;
+
+ return pos + 1;
+ }
+
+ size_t root_dir_start(StringRef str) {
+ // case "c:/"
+#ifdef LLVM_ON_WIN32
+ if (str.size() > 2 &&
+ str[1] == ':' &&
+ is_separator(str[2]))
+ return 2;
+#endif
+
+ // case "//"
+ if (str.size() == 2 &&
+ is_separator(str[0]) &&
+ str[0] == str[1])
+ return StringRef::npos;
+
+ // case "//net"
+ if (str.size() > 3 &&
+ is_separator(str[0]) &&
+ str[0] == str[1] &&
+ !is_separator(str[2])) {
+ return str.find_first_of(separators, 2);
+ }
+
+ // case "/"
+ if (str.size() > 0 && is_separator(str[0]))
+ return 0;
+
+ return StringRef::npos;
+ }
+
+ size_t parent_path_end(StringRef path) {
+ size_t end_pos = filename_pos(path);
+
+ bool filename_was_sep = path.size() > 0 && is_separator(path[end_pos]);
+
+ // Skip separators except for root dir.
+ size_t root_dir_pos = root_dir_start(path.substr(0, end_pos));
+
+ while(end_pos > 0 &&
+ (end_pos - 1) != root_dir_pos &&
+ is_separator(path[end_pos - 1]))
+ --end_pos;
+
+ if (end_pos == 1 && root_dir_pos == 0 && filename_was_sep)
+ return StringRef::npos;
+
+ return end_pos;
+ }
+} // end unnamed namespace
+
+namespace llvm {
+namespace sys {
+namespace path {
+
+const_iterator begin(StringRef path) {
+ const_iterator i;
+ i.Path = path;
+ i.Component = find_first_component(path);
+ i.Position = 0;
+ 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]) &&
+ Component[1] == Component[0] &&
+ !is_separator(Component[2]);
+
+ // Handle separators.
+ if (is_separator(Path[Position])) {
+ // Root dir.
+ if (was_net
+#ifdef LLVM_ON_WIN32
+ // c:/
+ || Component.endswith(":")
+#endif
+ ) {
+ Component = Path.substr(Position, 1);
+ return *this;
+ }
+
+ // Skip extra separators.
+ while (Position != Path.size() &&
+ is_separator(Path[Position])) {
+ ++Position;
+ }
+
+ // Treat trailing '/' as a '.'.
+ if (Position == Path.size()) {
+ --Position;
+ Component = ".";
+ return *this;
+ }
+ }
+
+ // Find next component.
+ size_t end_pos = Path.find_first_of(separators, Position);
+ Component = Path.slice(Position, end_pos);
+
+ return *this;
+}
+
+const_iterator &const_iterator::operator--() {
+ // If we're at the end and the previous char was a '/', return '.'.
+ if (Position == Path.size() &&
+ Path.size() > 1 &&
+ is_separator(Path[Position - 1])
+#ifdef LLVM_ON_WIN32
+ && Path[Position - 2] != ':'
+#endif
+ ) {
+ --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 &&
+ (end_pos - 1) != root_dir_pos &&
+ is_separator(Path[end_pos - 1]))
+ --end_pos;
+
+ // Find next separator.
+ size_t start_pos = filename_pos(Path.substr(0, end_pos));
+ Component = Path.slice(start_pos, end_pos);
+ Position = start_pos;
+ return *this;
+}
+
+bool const_iterator::operator==(const const_iterator &RHS) const {
+ return Path.begin() == RHS.Path.begin() &&
+ 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) {
+ const_iterator b = begin(path),
+ pos = b,
+ e = end(path);
+ if (b != e) {
+ bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
+ bool has_drive =
+#ifdef LLVM_ON_WIN32
+ b->endswith(":");
+#else
+ false;
+#endif
+
+ if (has_net || has_drive) {
+ if ((++pos != e) && is_separator((*pos)[0])) {
+ // {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])) {
+ return *b;
+ }
+ }
+
+ return StringRef();
+}
+
+const StringRef root_name(StringRef path) {
+ const_iterator b = begin(path),
+ e = end(path);
+ if (b != e) {
+ bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
+ bool has_drive =
+#ifdef LLVM_ON_WIN32
+ b->endswith(":");
+#else
+ false;
+#endif
+
+ if (has_net || has_drive) {
+ // just {C:,//net}, return the first component.
+ return *b;
+ }
+ }
+
+ // No path or no name.
+ return StringRef();
+}
+
+const StringRef root_directory(StringRef path) {
+ const_iterator b = begin(path),
+ pos = b,
+ e = end(path);
+ if (b != e) {
+ bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
+ bool has_drive =
+#ifdef LLVM_ON_WIN32
+ b->endswith(":");
+#else
+ false;
+#endif
+
+ if ((has_net || has_drive) &&
+ // {C:,//net}, skip to the next component.
+ (++pos != e) && is_separator((*pos)[0])) {
+ return *pos;
+ }
+
+ // POSIX style root directory.
+ if (!has_net && is_separator((*b)[0])) {
+ return *b;
+ }
+ }
+
+ // No path or no root.
+ return StringRef();
+}
+
+const StringRef relative_path(StringRef path) {
+ StringRef root = root_path(path);
+ return root.substr(root.size());
+}
+
+void append(SmallVectorImpl<char> &path, 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 (SmallVectorImpl<StringRef>::const_iterator i = components.begin(),
+ e = components.end();
+ i != e; ++i) {
+ bool path_has_sep = !path.empty() && is_separator(path[path.size() - 1]);
+ bool component_has_sep = !i->empty() && is_separator((*i)[0]);
+ bool is_root_name = has_root_name(*i);
+
+ if (path_has_sep) {
+ // Strip separators from beginning of component.
+ size_t loc = i->find_first_not_of(separators);
+ StringRef c = i->substr(loc);
+
+ // Append it.
+ path.append(c.begin(), c.end());
+ continue;
+ }
+
+ if (!component_has_sep && !(path.empty() || is_root_name)) {
+ // Add a separator.
+ path.push_back(prefered_separator);
+ }
+
+ path.append(i->begin(), i->end());
+ }
+}
+
+void append(SmallVectorImpl<char> &path,
+ const_iterator begin, const_iterator end) {
+ for (; begin != end; ++begin)
+ path::append(path, *begin);
+}
+
+const StringRef parent_path(StringRef path) {
+ size_t end_pos = parent_path_end(path);
+ if (end_pos == StringRef::npos)
+ return StringRef();
+ else
+ return path.substr(0, end_pos);
+}
+
+void remove_filename(SmallVectorImpl<char> &path) {
+ size_t end_pos = parent_path_end(StringRef(path.begin(), path.size()));
+ if (end_pos != StringRef::npos)
+ path.set_size(end_pos);
+}
+
+void replace_extension(SmallVectorImpl<char> &path, const Twine &extension) {
+ 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))
+ 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 native(const Twine &path, SmallVectorImpl<char> &result) {
+ // Clear result.
+ result.clear();
+#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);
+ }
+#else
+ path.toVector(result);
+#endif
+}
+
+const StringRef filename(StringRef path) {
+ return *(--end(path));
+}
+
+const StringRef stem(StringRef path) {
+ StringRef fname = filename(path);
+ 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);
+}
+
+const StringRef extension(StringRef path) {
+ StringRef fname = filename(path);
+ 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) {
+ switch(value) {
+#ifdef LLVM_ON_WIN32
+ case '\\': // fall through
+#endif
+ case '/': return true;
+ default: return false;
+ }
+}
+
+bool has_root_name(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !root_name(p).empty();
+}
+
+bool has_root_directory(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !root_directory(p).empty();
+}
+
+bool has_root_path(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !root_path(p).empty();
+}
+
+bool has_relative_path(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !relative_path(p).empty();
+}
+
+bool has_filename(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !filename(p).empty();
+}
+
+bool has_parent_path(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !parent_path(p).empty();
+}
+
+bool has_stem(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !stem(p).empty();
+}
+
+bool has_extension(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ return !extension(p).empty();
+}
+
+bool is_absolute(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toStringRef(path_storage);
+
+ bool rootDir = has_root_directory(p),
+#ifdef LLVM_ON_WIN32
+ rootName = has_root_name(p);
+#else
+ rootName = true;
+#endif
+
+ return rootDir && rootName;
+}
+
+bool is_relative(const Twine &path) {
+ return !is_absolute(path);
+}
+
+} // end namespace path
+
+namespace fs {
+
+error_code make_absolute(SmallVectorImpl<char> &path) {
+ StringRef p(path.data(), path.size());
+
+ bool rootName = path::has_root_name(p),
+ rootDirectory = path::has_root_directory(p);
+
+ // Already absolute.
+ if (rootName && rootDirectory)
+ return success;
+
+ // All of the following conditions will need the current directory.
+ SmallString<128> current_dir;
+ if (error_code ec = current_path(current_dir)) return ec;
+
+ // 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 success;
+ }
+
+ 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 success;
+ }
+
+ 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 success;
+ }
+
+ 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);
+
+ StringRef parent = path::parent_path(p);
+ bool parent_exists;
+
+ if (error_code ec = fs::exists(parent, parent_exists)) return ec;
+
+ if (!parent_exists)
+ return create_directories(parent, existed);
+
+ return create_directory(p, existed);
+}
+
+bool exists(file_status status) {
+ return status_known(status) && status.type() != file_type::file_not_found;
+}
+
+bool status_known(file_status s) {
+ return s.type() != file_type::status_error;
+}
+
+bool is_directory(file_status status) {
+ return status.type() == file_type::directory_file;
+}
+
+error_code is_directory(const Twine &path, bool &result) {
+ file_status st;
+ if (error_code ec = status(path, st))
+ return ec;
+ result = is_directory(st);
+ return success;
+}
+
+bool is_regular_file(file_status status) {
+ return status.type() == file_type::regular_file;
+}
+
+error_code is_regular_file(const Twine &path, bool &result) {
+ file_status st;
+ if (error_code ec = status(path, st))
+ return ec;
+ result = is_regular_file(st);
+ return 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 success;
+}
+
+bool is_other(file_status status) {
+ return exists(status) &&
+ !is_regular_file(status) &&
+ !is_directory(status) &&
+ !is_symlink(status);
+}
+
+void directory_entry::replace_filename(const Twine &filename, file_status st,
+ file_status symlink_st) {
+ SmallString<128> path(Path.begin(), Path.end());
+ path::remove_filename(path);
+ path::append(path, filename);
+ Path = path.str();
+ Status = st;
+ SymlinkStatus = symlink_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 success;
+ }
+ return ec;
+ }
+
+ result = Magic == Buffer;
+ return success;
+}
+
+error_code identify_magic(const Twine &path, LLVMFileType &result) {
+ SmallString<32> Magic;
+ error_code ec = get_magic(path, Magic.capacity(), Magic);
+ if (ec && ec != errc::value_too_large)
+ return ec;
+
+ result = IdentifyFileType(Magic.data(), Magic.size());
+ return success;
+}
+
+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;
+ for (directory_iterator i(path, ec), 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 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);
+}
+
+error_code directory_entry::status(file_status &result) const {
+ return fs::status(Path, result);
+}
+
+} // end namespace fs
+} // end namespace sys
+} // end namespace llvm
+
+// Include the truly platform-specific parts.
+#if defined(LLVM_ON_UNIX)
+#include "Unix/PathV2.inc"
+#endif
+#if defined(LLVM_ON_WIN32)
+#include "Windows/PathV2.inc"
+#endif
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