1 //===-- Path.cpp - Implement OS Path Concept ------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the operating system Path API.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "llvm/Support/Path.h"
14 #include "llvm/ADT/ArrayRef.h"
15 #include "llvm/ADT/ScopeExit.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/Config/config.h"
18 #include "llvm/Config/llvm-config.h"
19 #include "llvm/Support/Endian.h"
20 #include "llvm/Support/Errc.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/FileSystem.h"
23 #include "llvm/Support/Process.h"
24 #include "llvm/Support/Signals.h"
25 #include <cctype>
26 #include <cerrno>
27
28 #if !defined(_MSC_VER) && !defined(__MINGW32__)
29 #include <unistd.h>
30 #else
31 #include <io.h>
32 #endif
33
34 using namespace llvm;
35 using namespace llvm::support::endian;
36
37 namespace {
38 using llvm::StringRef;
39 using llvm::sys::path::is_separator;
40 using llvm::sys::path::Style;
41
real_style(Style style)42 inline Style real_style(Style style) {
43 if (style != Style::native)
44 return style;
45 if (is_style_posix(style))
46 return Style::posix;
47 return LLVM_WINDOWS_PREFER_FORWARD_SLASH ? Style::windows_slash
48 : Style::windows_backslash;
49 }
50
separators(Style style)51 inline const char *separators(Style style) {
52 if (is_style_windows(style))
53 return "\\/";
54 return "/";
55 }
56
preferred_separator(Style style)57 inline char preferred_separator(Style style) {
58 if (real_style(style) == Style::windows)
59 return '\\';
60 return '/';
61 }
62
find_first_component(StringRef path,Style style)63 StringRef find_first_component(StringRef path, Style style) {
64 // Look for this first component in the following order.
65 // * empty (in this case we return an empty string)
66 // * either C: or {//,\\}net.
67 // * {/,\}
68 // * {file,directory}name
69
70 if (path.empty())
71 return path;
72
73 if (is_style_windows(style)) {
74 // C:
75 if (path.size() >= 2 &&
76 std::isalpha(static_cast<unsigned char>(path[0])) && path[1] == ':')
77 return path.substr(0, 2);
78 }
79
80 // //net
81 if ((path.size() > 2) && is_separator(path[0], style) &&
82 path[0] == path[1] && !is_separator(path[2], style)) {
83 // Find the next directory separator.
84 size_t end = path.find_first_of(separators(style), 2);
85 return path.substr(0, end);
86 }
87
88 // {/,\}
89 if (is_separator(path[0], style))
90 return path.substr(0, 1);
91
92 // * {file,directory}name
93 size_t end = path.find_first_of(separators(style));
94 return path.substr(0, end);
95 }
96
97 // Returns the first character of the filename in str. For paths ending in
98 // '/', it returns the position of the '/'.
filename_pos(StringRef str,Style style)99 size_t filename_pos(StringRef str, Style style) {
100 if (str.size() > 0 && is_separator(str[str.size() - 1], style))
101 return str.size() - 1;
102
103 size_t pos = str.find_last_of(separators(style), str.size() - 1);
104
105 if (is_style_windows(style)) {
106 if (pos == StringRef::npos)
107 pos = str.find_last_of(':', str.size() - 1);
108 }
109
110 if (pos == StringRef::npos || (pos == 1 && is_separator(str[0], style)))
111 return 0;
112
113 return pos + 1;
114 }
115
116 // Returns the position of the root directory in str. If there is no root
117 // directory in str, it returns StringRef::npos.
root_dir_start(StringRef str,Style style)118 size_t root_dir_start(StringRef str, Style style) {
119 // case "c:/"
120 if (is_style_windows(style)) {
121 if (str.size() > 2 && str[1] == ':' && is_separator(str[2], style))
122 return 2;
123 }
124
125 // case "//net"
126 if (str.size() > 3 && is_separator(str[0], style) && str[0] == str[1] &&
127 !is_separator(str[2], style)) {
128 return str.find_first_of(separators(style), 2);
129 }
130
131 // case "/"
132 if (str.size() > 0 && is_separator(str[0], style))
133 return 0;
134
135 return StringRef::npos;
136 }
137
138 // Returns the position past the end of the "parent path" of path. The parent
139 // path will not end in '/', unless the parent is the root directory. If the
140 // path has no parent, 0 is returned.
parent_path_end(StringRef path,Style style)141 size_t parent_path_end(StringRef path, Style style) {
142 size_t end_pos = filename_pos(path, style);
143
144 bool filename_was_sep =
145 path.size() > 0 && is_separator(path[end_pos], style);
146
147 // Skip separators until we reach root dir (or the start of the string).
148 size_t root_dir_pos = root_dir_start(path, style);
149 while (end_pos > 0 &&
150 (root_dir_pos == StringRef::npos || end_pos > root_dir_pos) &&
151 is_separator(path[end_pos - 1], style))
152 --end_pos;
153
154 if (end_pos == root_dir_pos && !filename_was_sep) {
155 // We've reached the root dir and the input path was *not* ending in a
156 // sequence of slashes. Include the root dir in the parent path.
157 return root_dir_pos + 1;
158 }
159
160 // Otherwise, just include before the last slash.
161 return end_pos;
162 }
163 } // end unnamed namespace
164
165 enum FSEntity {
166 FS_Dir,
167 FS_File,
168 FS_Name
169 };
170
171 static std::error_code
createUniqueEntity(const Twine & Model,int & ResultFD,SmallVectorImpl<char> & ResultPath,bool MakeAbsolute,FSEntity Type,sys::fs::OpenFlags Flags=sys::fs::OF_None,unsigned Mode=0)172 createUniqueEntity(const Twine &Model, int &ResultFD,
173 SmallVectorImpl<char> &ResultPath, bool MakeAbsolute,
174 FSEntity Type, sys::fs::OpenFlags Flags = sys::fs::OF_None,
175 unsigned Mode = 0) {
176
177 // Limit the number of attempts we make, so that we don't infinite loop. E.g.
178 // "permission denied" could be for a specific file (so we retry with a
179 // different name) or for the whole directory (retry would always fail).
180 // Checking which is racy, so we try a number of times, then give up.
181 std::error_code EC;
182 for (int Retries = 128; Retries > 0; --Retries) {
183 sys::fs::createUniquePath(Model, ResultPath, MakeAbsolute);
184 // Try to open + create the file.
185 switch (Type) {
186 case FS_File: {
187 EC = sys::fs::openFileForReadWrite(Twine(ResultPath.begin()), ResultFD,
188 sys::fs::CD_CreateNew, Flags, Mode);
189 if (EC) {
190 // errc::permission_denied happens on Windows when we try to open a file
191 // that has been marked for deletion.
192 if (EC == errc::file_exists || EC == errc::permission_denied)
193 continue;
194 return EC;
195 }
196
197 return std::error_code();
198 }
199
200 case FS_Name: {
201 EC = sys::fs::access(ResultPath.begin(), sys::fs::AccessMode::Exist);
202 if (EC == errc::no_such_file_or_directory)
203 return std::error_code();
204 if (EC)
205 return EC;
206 continue;
207 }
208
209 case FS_Dir: {
210 EC = sys::fs::create_directory(ResultPath.begin(), false);
211 if (EC) {
212 if (EC == errc::file_exists)
213 continue;
214 return EC;
215 }
216 return std::error_code();
217 }
218 }
219 llvm_unreachable("Invalid Type");
220 }
221 return EC;
222 }
223
224 namespace llvm {
225 namespace sys {
226 namespace path {
227
begin(StringRef path,Style style)228 const_iterator begin(StringRef path, Style style) {
229 const_iterator i;
230 i.Path = path;
231 i.Component = find_first_component(path, style);
232 i.Position = 0;
233 i.S = style;
234 return i;
235 }
236
end(StringRef path)237 const_iterator end(StringRef path) {
238 const_iterator i;
239 i.Path = path;
240 i.Position = path.size();
241 return i;
242 }
243
operator ++()244 const_iterator &const_iterator::operator++() {
245 assert(Position < Path.size() && "Tried to increment past end!");
246
247 // Increment Position to past the current component
248 Position += Component.size();
249
250 // Check for end.
251 if (Position == Path.size()) {
252 Component = StringRef();
253 return *this;
254 }
255
256 // Both POSIX and Windows treat paths that begin with exactly two separators
257 // specially.
258 bool was_net = Component.size() > 2 && is_separator(Component[0], S) &&
259 Component[1] == Component[0] && !is_separator(Component[2], S);
260
261 // Handle separators.
262 if (is_separator(Path[Position], S)) {
263 // Root dir.
264 if (was_net ||
265 // c:/
266 (is_style_windows(S) && Component.ends_with(":"))) {
267 Component = Path.substr(Position, 1);
268 return *this;
269 }
270
271 // Skip extra separators.
272 while (Position != Path.size() && is_separator(Path[Position], S)) {
273 ++Position;
274 }
275
276 // Treat trailing '/' as a '.', unless it is the root dir.
277 if (Position == Path.size() && Component != "/") {
278 --Position;
279 Component = ".";
280 return *this;
281 }
282 }
283
284 // Find next component.
285 size_t end_pos = Path.find_first_of(separators(S), Position);
286 Component = Path.slice(Position, end_pos);
287
288 return *this;
289 }
290
operator ==(const const_iterator & RHS) const291 bool const_iterator::operator==(const const_iterator &RHS) const {
292 return Path.begin() == RHS.Path.begin() && Position == RHS.Position;
293 }
294
operator -(const const_iterator & RHS) const295 ptrdiff_t const_iterator::operator-(const const_iterator &RHS) const {
296 return Position - RHS.Position;
297 }
298
rbegin(StringRef Path,Style style)299 reverse_iterator rbegin(StringRef Path, Style style) {
300 reverse_iterator I;
301 I.Path = Path;
302 I.Position = Path.size();
303 I.S = style;
304 ++I;
305 return I;
306 }
307
rend(StringRef Path)308 reverse_iterator rend(StringRef Path) {
309 reverse_iterator I;
310 I.Path = Path;
311 I.Component = Path.substr(0, 0);
312 I.Position = 0;
313 return I;
314 }
315
operator ++()316 reverse_iterator &reverse_iterator::operator++() {
317 size_t root_dir_pos = root_dir_start(Path, S);
318
319 // Skip separators unless it's the root directory.
320 size_t end_pos = Position;
321 while (end_pos > 0 && (end_pos - 1) != root_dir_pos &&
322 is_separator(Path[end_pos - 1], S))
323 --end_pos;
324
325 // Treat trailing '/' as a '.', unless it is the root dir.
326 if (Position == Path.size() && !Path.empty() &&
327 is_separator(Path.back(), S) &&
328 (root_dir_pos == StringRef::npos || end_pos - 1 > root_dir_pos)) {
329 --Position;
330 Component = ".";
331 return *this;
332 }
333
334 // Find next separator.
335 size_t start_pos = filename_pos(Path.substr(0, end_pos), S);
336 Component = Path.slice(start_pos, end_pos);
337 Position = start_pos;
338 return *this;
339 }
340
operator ==(const reverse_iterator & RHS) const341 bool reverse_iterator::operator==(const reverse_iterator &RHS) const {
342 return Path.begin() == RHS.Path.begin() && Component == RHS.Component &&
343 Position == RHS.Position;
344 }
345
operator -(const reverse_iterator & RHS) const346 ptrdiff_t reverse_iterator::operator-(const reverse_iterator &RHS) const {
347 return Position - RHS.Position;
348 }
349
root_path(StringRef path,Style style)350 StringRef root_path(StringRef path, Style style) {
351 const_iterator b = begin(path, style), pos = b, e = end(path);
352 if (b != e) {
353 bool has_net =
354 b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
355 bool has_drive = is_style_windows(style) && b->ends_with(":");
356
357 if (has_net || has_drive) {
358 if ((++pos != e) && is_separator((*pos)[0], style)) {
359 // {C:/,//net/}, so get the first two components.
360 return path.substr(0, b->size() + pos->size());
361 }
362 // just {C:,//net}, return the first component.
363 return *b;
364 }
365
366 // POSIX style root directory.
367 if (is_separator((*b)[0], style)) {
368 return *b;
369 }
370 }
371
372 return StringRef();
373 }
374
root_name(StringRef path,Style style)375 StringRef root_name(StringRef path, Style style) {
376 const_iterator b = begin(path, style), e = end(path);
377 if (b != e) {
378 bool has_net =
379 b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
380 bool has_drive = is_style_windows(style) && b->ends_with(":");
381
382 if (has_net || has_drive) {
383 // just {C:,//net}, return the first component.
384 return *b;
385 }
386 }
387
388 // No path or no name.
389 return StringRef();
390 }
391
root_directory(StringRef path,Style style)392 StringRef root_directory(StringRef path, Style style) {
393 const_iterator b = begin(path, style), pos = b, e = end(path);
394 if (b != e) {
395 bool has_net =
396 b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
397 bool has_drive = is_style_windows(style) && b->ends_with(":");
398
399 if ((has_net || has_drive) &&
400 // {C:,//net}, skip to the next component.
401 (++pos != e) && is_separator((*pos)[0], style)) {
402 return *pos;
403 }
404
405 // POSIX style root directory.
406 if (!has_net && is_separator((*b)[0], style)) {
407 return *b;
408 }
409 }
410
411 // No path or no root.
412 return StringRef();
413 }
414
relative_path(StringRef path,Style style)415 StringRef relative_path(StringRef path, Style style) {
416 StringRef root = root_path(path, style);
417 return path.substr(root.size());
418 }
419
append(SmallVectorImpl<char> & path,Style style,const Twine & a,const Twine & b,const Twine & c,const Twine & d)420 void append(SmallVectorImpl<char> &path, Style style, const Twine &a,
421 const Twine &b, const Twine &c, const Twine &d) {
422 SmallString<32> a_storage;
423 SmallString<32> b_storage;
424 SmallString<32> c_storage;
425 SmallString<32> d_storage;
426
427 SmallVector<StringRef, 4> components;
428 if (!a.isTriviallyEmpty()) components.push_back(a.toStringRef(a_storage));
429 if (!b.isTriviallyEmpty()) components.push_back(b.toStringRef(b_storage));
430 if (!c.isTriviallyEmpty()) components.push_back(c.toStringRef(c_storage));
431 if (!d.isTriviallyEmpty()) components.push_back(d.toStringRef(d_storage));
432
433 for (auto &component : components) {
434 bool path_has_sep =
435 !path.empty() && is_separator(path[path.size() - 1], style);
436 if (path_has_sep) {
437 // Strip separators from beginning of component.
438 size_t loc = component.find_first_not_of(separators(style));
439 StringRef c = component.substr(loc);
440
441 // Append it.
442 path.append(c.begin(), c.end());
443 continue;
444 }
445
446 bool component_has_sep =
447 !component.empty() && is_separator(component[0], style);
448 if (!component_has_sep &&
449 !(path.empty() || has_root_name(component, style))) {
450 // Add a separator.
451 path.push_back(preferred_separator(style));
452 }
453
454 path.append(component.begin(), component.end());
455 }
456 }
457
append(SmallVectorImpl<char> & path,const Twine & a,const Twine & b,const Twine & c,const Twine & d)458 void append(SmallVectorImpl<char> &path, const Twine &a, const Twine &b,
459 const Twine &c, const Twine &d) {
460 append(path, Style::native, a, b, c, d);
461 }
462
append(SmallVectorImpl<char> & path,const_iterator begin,const_iterator end,Style style)463 void append(SmallVectorImpl<char> &path, const_iterator begin,
464 const_iterator end, Style style) {
465 for (; begin != end; ++begin)
466 path::append(path, style, *begin);
467 }
468
parent_path(StringRef path,Style style)469 StringRef parent_path(StringRef path, Style style) {
470 size_t end_pos = parent_path_end(path, style);
471 if (end_pos == StringRef::npos)
472 return StringRef();
473 return path.substr(0, end_pos);
474 }
475
remove_filename(SmallVectorImpl<char> & path,Style style)476 void remove_filename(SmallVectorImpl<char> &path, Style style) {
477 size_t end_pos = parent_path_end(StringRef(path.begin(), path.size()), style);
478 if (end_pos != StringRef::npos)
479 path.truncate(end_pos);
480 }
481
replace_extension(SmallVectorImpl<char> & path,const Twine & extension,Style style)482 void replace_extension(SmallVectorImpl<char> &path, const Twine &extension,
483 Style style) {
484 StringRef p(path.begin(), path.size());
485 SmallString<32> ext_storage;
486 StringRef ext = extension.toStringRef(ext_storage);
487
488 // Erase existing extension.
489 size_t pos = p.find_last_of('.');
490 if (pos != StringRef::npos && pos >= filename_pos(p, style))
491 path.truncate(pos);
492
493 // Append '.' if needed.
494 if (ext.size() > 0 && ext[0] != '.')
495 path.push_back('.');
496
497 // Append extension.
498 path.append(ext.begin(), ext.end());
499 }
500
starts_with(StringRef Path,StringRef Prefix,Style style=Style::native)501 static bool starts_with(StringRef Path, StringRef Prefix,
502 Style style = Style::native) {
503 // Windows prefix matching : case and separator insensitive
504 if (is_style_windows(style)) {
505 if (Path.size() < Prefix.size())
506 return false;
507 for (size_t I = 0, E = Prefix.size(); I != E; ++I) {
508 bool SepPath = is_separator(Path[I], style);
509 bool SepPrefix = is_separator(Prefix[I], style);
510 if (SepPath != SepPrefix)
511 return false;
512 if (!SepPath && toLower(Path[I]) != toLower(Prefix[I]))
513 return false;
514 }
515 return true;
516 }
517 return Path.starts_with(Prefix);
518 }
519
replace_path_prefix(SmallVectorImpl<char> & Path,StringRef OldPrefix,StringRef NewPrefix,Style style)520 bool replace_path_prefix(SmallVectorImpl<char> &Path, StringRef OldPrefix,
521 StringRef NewPrefix, Style style) {
522 if (OldPrefix.empty() && NewPrefix.empty())
523 return false;
524
525 StringRef OrigPath(Path.begin(), Path.size());
526 if (!starts_with(OrigPath, OldPrefix, style))
527 return false;
528
529 // If prefixes have the same size we can simply copy the new one over.
530 if (OldPrefix.size() == NewPrefix.size()) {
531 llvm::copy(NewPrefix, Path.begin());
532 return true;
533 }
534
535 StringRef RelPath = OrigPath.substr(OldPrefix.size());
536 SmallString<256> NewPath;
537 (Twine(NewPrefix) + RelPath).toVector(NewPath);
538 Path.swap(NewPath);
539 return true;
540 }
541
native(const Twine & path,SmallVectorImpl<char> & result,Style style)542 void native(const Twine &path, SmallVectorImpl<char> &result, Style style) {
543 assert((!path.isSingleStringRef() ||
544 path.getSingleStringRef().data() != result.data()) &&
545 "path and result are not allowed to overlap!");
546 // Clear result.
547 result.clear();
548 path.toVector(result);
549 native(result, style);
550 }
551
native(SmallVectorImpl<char> & Path,Style style)552 void native(SmallVectorImpl<char> &Path, Style style) {
553 if (Path.empty())
554 return;
555 if (is_style_windows(style)) {
556 for (char &Ch : Path)
557 if (is_separator(Ch, style))
558 Ch = preferred_separator(style);
559 if (Path[0] == '~' && (Path.size() == 1 || is_separator(Path[1], style))) {
560 SmallString<128> PathHome;
561 home_directory(PathHome);
562 PathHome.append(Path.begin() + 1, Path.end());
563 Path = PathHome;
564 }
565 } else {
566 std::replace(Path.begin(), Path.end(), '\\', '/');
567 }
568 }
569
convert_to_slash(StringRef path,Style style)570 std::string convert_to_slash(StringRef path, Style style) {
571 if (is_style_posix(style))
572 return std::string(path);
573
574 std::string s = path.str();
575 std::replace(s.begin(), s.end(), '\\', '/');
576 return s;
577 }
578
filename(StringRef path,Style style)579 StringRef filename(StringRef path, Style style) { return *rbegin(path, style); }
580
stem(StringRef path,Style style)581 StringRef stem(StringRef path, Style style) {
582 StringRef fname = filename(path, style);
583 size_t pos = fname.find_last_of('.');
584 if (pos == StringRef::npos)
585 return fname;
586 if ((fname.size() == 1 && fname == ".") ||
587 (fname.size() == 2 && fname == ".."))
588 return fname;
589 return fname.substr(0, pos);
590 }
591
extension(StringRef path,Style style)592 StringRef extension(StringRef path, Style style) {
593 StringRef fname = filename(path, style);
594 size_t pos = fname.find_last_of('.');
595 if (pos == StringRef::npos)
596 return StringRef();
597 if ((fname.size() == 1 && fname == ".") ||
598 (fname.size() == 2 && fname == ".."))
599 return StringRef();
600 return fname.substr(pos);
601 }
602
is_separator(char value,Style style)603 bool is_separator(char value, Style style) {
604 if (value == '/')
605 return true;
606 if (is_style_windows(style))
607 return value == '\\';
608 return false;
609 }
610
get_separator(Style style)611 StringRef get_separator(Style style) {
612 if (real_style(style) == Style::windows)
613 return "\\";
614 return "/";
615 }
616
has_root_name(const Twine & path,Style style)617 bool has_root_name(const Twine &path, Style style) {
618 SmallString<128> path_storage;
619 StringRef p = path.toStringRef(path_storage);
620
621 return !root_name(p, style).empty();
622 }
623
has_root_directory(const Twine & path,Style style)624 bool has_root_directory(const Twine &path, Style style) {
625 SmallString<128> path_storage;
626 StringRef p = path.toStringRef(path_storage);
627
628 return !root_directory(p, style).empty();
629 }
630
has_root_path(const Twine & path,Style style)631 bool has_root_path(const Twine &path, Style style) {
632 SmallString<128> path_storage;
633 StringRef p = path.toStringRef(path_storage);
634
635 return !root_path(p, style).empty();
636 }
637
has_relative_path(const Twine & path,Style style)638 bool has_relative_path(const Twine &path, Style style) {
639 SmallString<128> path_storage;
640 StringRef p = path.toStringRef(path_storage);
641
642 return !relative_path(p, style).empty();
643 }
644
has_filename(const Twine & path,Style style)645 bool has_filename(const Twine &path, Style style) {
646 SmallString<128> path_storage;
647 StringRef p = path.toStringRef(path_storage);
648
649 return !filename(p, style).empty();
650 }
651
has_parent_path(const Twine & path,Style style)652 bool has_parent_path(const Twine &path, Style style) {
653 SmallString<128> path_storage;
654 StringRef p = path.toStringRef(path_storage);
655
656 return !parent_path(p, style).empty();
657 }
658
has_stem(const Twine & path,Style style)659 bool has_stem(const Twine &path, Style style) {
660 SmallString<128> path_storage;
661 StringRef p = path.toStringRef(path_storage);
662
663 return !stem(p, style).empty();
664 }
665
has_extension(const Twine & path,Style style)666 bool has_extension(const Twine &path, Style style) {
667 SmallString<128> path_storage;
668 StringRef p = path.toStringRef(path_storage);
669
670 return !extension(p, style).empty();
671 }
672
is_absolute(const Twine & path,Style style)673 bool is_absolute(const Twine &path, Style style) {
674 SmallString<128> path_storage;
675 StringRef p = path.toStringRef(path_storage);
676
677 bool rootDir = has_root_directory(p, style);
678 bool rootName = is_style_posix(style) || has_root_name(p, style);
679
680 return rootDir && rootName;
681 }
682
is_absolute_gnu(const Twine & path,Style style)683 bool is_absolute_gnu(const Twine &path, Style style) {
684 SmallString<128> path_storage;
685 StringRef p = path.toStringRef(path_storage);
686
687 // Handle '/' which is absolute for both Windows and POSIX systems.
688 // Handle '\\' on Windows.
689 if (!p.empty() && is_separator(p.front(), style))
690 return true;
691
692 if (is_style_windows(style)) {
693 // Handle drive letter pattern (a character followed by ':') on Windows.
694 if (p.size() >= 2 && (p[0] && p[1] == ':'))
695 return true;
696 }
697
698 return false;
699 }
700
is_relative(const Twine & path,Style style)701 bool is_relative(const Twine &path, Style style) {
702 return !is_absolute(path, style);
703 }
704
remove_leading_dotslash(StringRef Path,Style style)705 StringRef remove_leading_dotslash(StringRef Path, Style style) {
706 // Remove leading "./" (or ".//" or "././" etc.)
707 while (Path.size() > 2 && Path[0] == '.' && is_separator(Path[1], style)) {
708 Path = Path.substr(2);
709 while (Path.size() > 0 && is_separator(Path[0], style))
710 Path = Path.substr(1);
711 }
712 return Path;
713 }
714
715 // Remove path traversal components ("." and "..") when possible, and
716 // canonicalize slashes.
remove_dots(SmallVectorImpl<char> & the_path,bool remove_dot_dot,Style style)717 bool remove_dots(SmallVectorImpl<char> &the_path, bool remove_dot_dot,
718 Style style) {
719 style = real_style(style);
720 StringRef remaining(the_path.data(), the_path.size());
721 bool needs_change = false;
722 SmallVector<StringRef, 16> components;
723
724 // Consume the root path, if present.
725 StringRef root = path::root_path(remaining, style);
726 bool absolute = !root.empty();
727 if (absolute)
728 remaining = remaining.drop_front(root.size());
729
730 // Loop over path components manually. This makes it easier to detect
731 // non-preferred slashes and double separators that must be canonicalized.
732 while (!remaining.empty()) {
733 size_t next_slash = remaining.find_first_of(separators(style));
734 if (next_slash == StringRef::npos)
735 next_slash = remaining.size();
736 StringRef component = remaining.take_front(next_slash);
737 remaining = remaining.drop_front(next_slash);
738
739 // Eat the slash, and check if it is the preferred separator.
740 if (!remaining.empty()) {
741 needs_change |= remaining.front() != preferred_separator(style);
742 remaining = remaining.drop_front();
743 // The path needs to be rewritten if it has a trailing slash.
744 // FIXME: This is emergent behavior that could be removed.
745 needs_change |= remaining.empty();
746 }
747
748 // Check for path traversal components or double separators.
749 if (component.empty() || component == ".") {
750 needs_change = true;
751 } else if (remove_dot_dot && component == "..") {
752 needs_change = true;
753 // Do not allow ".." to remove the root component. If this is the
754 // beginning of a relative path, keep the ".." component.
755 if (!components.empty() && components.back() != "..") {
756 components.pop_back();
757 } else if (!absolute) {
758 components.push_back(component);
759 }
760 } else {
761 components.push_back(component);
762 }
763 }
764
765 SmallString<256> buffer = root;
766 // "root" could be "/", which may need to be translated into "\".
767 make_preferred(buffer, style);
768 needs_change |= root != buffer;
769
770 // Avoid rewriting the path unless we have to.
771 if (!needs_change)
772 return false;
773
774 if (!components.empty()) {
775 buffer += components[0];
776 for (StringRef C : ArrayRef(components).drop_front()) {
777 buffer += preferred_separator(style);
778 buffer += C;
779 }
780 }
781 the_path.swap(buffer);
782 return true;
783 }
784
785 } // end namespace path
786
787 namespace fs {
788
getUniqueID(const Twine Path,UniqueID & Result)789 std::error_code getUniqueID(const Twine Path, UniqueID &Result) {
790 file_status Status;
791 std::error_code EC = status(Path, Status);
792 if (EC)
793 return EC;
794 Result = Status.getUniqueID();
795 return std::error_code();
796 }
797
createUniquePath(const Twine & Model,SmallVectorImpl<char> & ResultPath,bool MakeAbsolute)798 void createUniquePath(const Twine &Model, SmallVectorImpl<char> &ResultPath,
799 bool MakeAbsolute) {
800 SmallString<128> ModelStorage;
801 Model.toVector(ModelStorage);
802
803 if (MakeAbsolute) {
804 // Make model absolute by prepending a temp directory if it's not already.
805 if (!sys::path::is_absolute(Twine(ModelStorage))) {
806 SmallString<128> TDir;
807 sys::path::system_temp_directory(true, TDir);
808 sys::path::append(TDir, Twine(ModelStorage));
809 ModelStorage.swap(TDir);
810 }
811 }
812
813 ResultPath = ModelStorage;
814 ResultPath.push_back(0);
815 ResultPath.pop_back();
816
817 // Replace '%' with random chars.
818 for (unsigned i = 0, e = ModelStorage.size(); i != e; ++i) {
819 if (ModelStorage[i] == '%')
820 ResultPath[i] = "0123456789abcdef"[sys::Process::GetRandomNumber() & 15];
821 }
822 }
823
createUniqueFile(const Twine & Model,int & ResultFd,SmallVectorImpl<char> & ResultPath,OpenFlags Flags,unsigned Mode)824 std::error_code createUniqueFile(const Twine &Model, int &ResultFd,
825 SmallVectorImpl<char> &ResultPath,
826 OpenFlags Flags, unsigned Mode) {
827 return createUniqueEntity(Model, ResultFd, ResultPath, false, FS_File, Flags,
828 Mode);
829 }
830
createUniqueFile(const Twine & Model,SmallVectorImpl<char> & ResultPath,unsigned Mode)831 std::error_code createUniqueFile(const Twine &Model,
832 SmallVectorImpl<char> &ResultPath,
833 unsigned Mode) {
834 int FD;
835 auto EC = createUniqueFile(Model, FD, ResultPath, OF_None, Mode);
836 if (EC)
837 return EC;
838 // FD is only needed to avoid race conditions. Close it right away.
839 close(FD);
840 return EC;
841 }
842
843 static std::error_code
createTemporaryFile(const Twine & Model,int & ResultFD,llvm::SmallVectorImpl<char> & ResultPath,FSEntity Type,sys::fs::OpenFlags Flags=sys::fs::OF_None)844 createTemporaryFile(const Twine &Model, int &ResultFD,
845 llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type,
846 sys::fs::OpenFlags Flags = sys::fs::OF_None) {
847 SmallString<128> Storage;
848 StringRef P = Model.toNullTerminatedStringRef(Storage);
849 assert(P.find_first_of(separators(Style::native)) == StringRef::npos &&
850 "Model must be a simple filename.");
851 // Use P.begin() so that createUniqueEntity doesn't need to recreate Storage.
852 return createUniqueEntity(P.begin(), ResultFD, ResultPath, true, Type, Flags,
853 owner_read | owner_write);
854 }
855
856 static std::error_code
createTemporaryFile(const Twine & Prefix,StringRef Suffix,int & ResultFD,llvm::SmallVectorImpl<char> & ResultPath,FSEntity Type,sys::fs::OpenFlags Flags=sys::fs::OF_None)857 createTemporaryFile(const Twine &Prefix, StringRef Suffix, int &ResultFD,
858 llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type,
859 sys::fs::OpenFlags Flags = sys::fs::OF_None) {
860 const char *Middle = Suffix.empty() ? "-%%%%%%" : "-%%%%%%.";
861 return createTemporaryFile(Prefix + Middle + Suffix, ResultFD, ResultPath,
862 Type, Flags);
863 }
864
createTemporaryFile(const Twine & Prefix,StringRef Suffix,int & ResultFD,SmallVectorImpl<char> & ResultPath,sys::fs::OpenFlags Flags)865 std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
866 int &ResultFD,
867 SmallVectorImpl<char> &ResultPath,
868 sys::fs::OpenFlags Flags) {
869 return createTemporaryFile(Prefix, Suffix, ResultFD, ResultPath, FS_File,
870 Flags);
871 }
872
createTemporaryFile(const Twine & Prefix,StringRef Suffix,SmallVectorImpl<char> & ResultPath,sys::fs::OpenFlags Flags)873 std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
874 SmallVectorImpl<char> &ResultPath,
875 sys::fs::OpenFlags Flags) {
876 int FD;
877 auto EC = createTemporaryFile(Prefix, Suffix, FD, ResultPath, Flags);
878 if (EC)
879 return EC;
880 // FD is only needed to avoid race conditions. Close it right away.
881 close(FD);
882 return EC;
883 }
884
885 // This is a mkdtemp with a different pattern. We use createUniqueEntity mostly
886 // for consistency. We should try using mkdtemp.
createUniqueDirectory(const Twine & Prefix,SmallVectorImpl<char> & ResultPath)887 std::error_code createUniqueDirectory(const Twine &Prefix,
888 SmallVectorImpl<char> &ResultPath) {
889 int Dummy;
890 return createUniqueEntity(Prefix + "-%%%%%%", Dummy, ResultPath, true,
891 FS_Dir);
892 }
893
894 std::error_code
getPotentiallyUniqueFileName(const Twine & Model,SmallVectorImpl<char> & ResultPath)895 getPotentiallyUniqueFileName(const Twine &Model,
896 SmallVectorImpl<char> &ResultPath) {
897 int Dummy;
898 return createUniqueEntity(Model, Dummy, ResultPath, false, FS_Name);
899 }
900
901 std::error_code
getPotentiallyUniqueTempFileName(const Twine & Prefix,StringRef Suffix,SmallVectorImpl<char> & ResultPath)902 getPotentiallyUniqueTempFileName(const Twine &Prefix, StringRef Suffix,
903 SmallVectorImpl<char> &ResultPath) {
904 int Dummy;
905 return createTemporaryFile(Prefix, Suffix, Dummy, ResultPath, FS_Name);
906 }
907
make_absolute(const Twine & current_directory,SmallVectorImpl<char> & path)908 void make_absolute(const Twine ¤t_directory,
909 SmallVectorImpl<char> &path) {
910 StringRef p(path.data(), path.size());
911
912 bool rootDirectory = path::has_root_directory(p);
913 bool rootName = path::has_root_name(p);
914
915 // Already absolute.
916 if ((rootName || is_style_posix(Style::native)) && rootDirectory)
917 return;
918
919 // All of the following conditions will need the current directory.
920 SmallString<128> current_dir;
921 current_directory.toVector(current_dir);
922
923 // Relative path. Prepend the current directory.
924 if (!rootName && !rootDirectory) {
925 // Append path to the current directory.
926 path::append(current_dir, p);
927 // Set path to the result.
928 path.swap(current_dir);
929 return;
930 }
931
932 if (!rootName && rootDirectory) {
933 StringRef cdrn = path::root_name(current_dir);
934 SmallString<128> curDirRootName(cdrn.begin(), cdrn.end());
935 path::append(curDirRootName, p);
936 // Set path to the result.
937 path.swap(curDirRootName);
938 return;
939 }
940
941 if (rootName && !rootDirectory) {
942 StringRef pRootName = path::root_name(p);
943 StringRef bRootDirectory = path::root_directory(current_dir);
944 StringRef bRelativePath = path::relative_path(current_dir);
945 StringRef pRelativePath = path::relative_path(p);
946
947 SmallString<128> res;
948 path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath);
949 path.swap(res);
950 return;
951 }
952
953 llvm_unreachable("All rootName and rootDirectory combinations should have "
954 "occurred above!");
955 }
956
make_absolute(SmallVectorImpl<char> & path)957 std::error_code make_absolute(SmallVectorImpl<char> &path) {
958 if (path::is_absolute(path))
959 return {};
960
961 SmallString<128> current_dir;
962 if (std::error_code ec = current_path(current_dir))
963 return ec;
964
965 make_absolute(current_dir, path);
966 return {};
967 }
968
create_directories(const Twine & Path,bool IgnoreExisting,perms Perms)969 std::error_code create_directories(const Twine &Path, bool IgnoreExisting,
970 perms Perms) {
971 SmallString<128> PathStorage;
972 StringRef P = Path.toStringRef(PathStorage);
973
974 // Be optimistic and try to create the directory
975 std::error_code EC = create_directory(P, IgnoreExisting, Perms);
976 // If we succeeded, or had any error other than the parent not existing, just
977 // return it.
978 if (EC != errc::no_such_file_or_directory)
979 return EC;
980
981 // We failed because of a no_such_file_or_directory, try to create the
982 // parent.
983 StringRef Parent = path::parent_path(P);
984 if (Parent.empty())
985 return EC;
986
987 if ((EC = create_directories(Parent, IgnoreExisting, Perms)))
988 return EC;
989
990 return create_directory(P, IgnoreExisting, Perms);
991 }
992
copy_file_internal(int ReadFD,int WriteFD)993 static std::error_code copy_file_internal(int ReadFD, int WriteFD) {
994 const size_t BufSize = 4096;
995 char *Buf = new char[BufSize];
996 int BytesRead = 0, BytesWritten = 0;
997 for (;;) {
998 BytesRead = read(ReadFD, Buf, BufSize);
999 if (BytesRead <= 0)
1000 break;
1001 while (BytesRead) {
1002 BytesWritten = write(WriteFD, Buf, BytesRead);
1003 if (BytesWritten < 0)
1004 break;
1005 BytesRead -= BytesWritten;
1006 }
1007 if (BytesWritten < 0)
1008 break;
1009 }
1010 delete[] Buf;
1011
1012 if (BytesRead < 0 || BytesWritten < 0)
1013 return std::error_code(errno, std::generic_category());
1014 return std::error_code();
1015 }
1016
1017 #ifndef __APPLE__
copy_file(const Twine & From,const Twine & To)1018 std::error_code copy_file(const Twine &From, const Twine &To) {
1019 int ReadFD, WriteFD;
1020 if (std::error_code EC = openFileForRead(From, ReadFD, OF_None))
1021 return EC;
1022 if (std::error_code EC =
1023 openFileForWrite(To, WriteFD, CD_CreateAlways, OF_None)) {
1024 close(ReadFD);
1025 return EC;
1026 }
1027
1028 std::error_code EC = copy_file_internal(ReadFD, WriteFD);
1029
1030 close(ReadFD);
1031 close(WriteFD);
1032
1033 return EC;
1034 }
1035 #endif
1036
copy_file(const Twine & From,int ToFD)1037 std::error_code copy_file(const Twine &From, int ToFD) {
1038 int ReadFD;
1039 if (std::error_code EC = openFileForRead(From, ReadFD, OF_None))
1040 return EC;
1041
1042 std::error_code EC = copy_file_internal(ReadFD, ToFD);
1043
1044 close(ReadFD);
1045
1046 return EC;
1047 }
1048
md5_contents(int FD)1049 ErrorOr<MD5::MD5Result> md5_contents(int FD) {
1050 MD5 Hash;
1051
1052 constexpr size_t BufSize = 4096;
1053 std::vector<uint8_t> Buf(BufSize);
1054 int BytesRead = 0;
1055 for (;;) {
1056 BytesRead = read(FD, Buf.data(), BufSize);
1057 if (BytesRead <= 0)
1058 break;
1059 Hash.update(ArrayRef(Buf.data(), BytesRead));
1060 }
1061
1062 if (BytesRead < 0)
1063 return std::error_code(errno, std::generic_category());
1064 MD5::MD5Result Result;
1065 Hash.final(Result);
1066 return Result;
1067 }
1068
md5_contents(const Twine & Path)1069 ErrorOr<MD5::MD5Result> md5_contents(const Twine &Path) {
1070 int FD;
1071 if (auto EC = openFileForRead(Path, FD, OF_None))
1072 return EC;
1073
1074 auto Result = md5_contents(FD);
1075 close(FD);
1076 return Result;
1077 }
1078
exists(const basic_file_status & status)1079 bool exists(const basic_file_status &status) {
1080 return status_known(status) && status.type() != file_type::file_not_found;
1081 }
1082
status_known(const basic_file_status & s)1083 bool status_known(const basic_file_status &s) {
1084 return s.type() != file_type::status_error;
1085 }
1086
get_file_type(const Twine & Path,bool Follow)1087 file_type get_file_type(const Twine &Path, bool Follow) {
1088 file_status st;
1089 if (status(Path, st, Follow))
1090 return file_type::status_error;
1091 return st.type();
1092 }
1093
is_directory(const basic_file_status & status)1094 bool is_directory(const basic_file_status &status) {
1095 return status.type() == file_type::directory_file;
1096 }
1097
is_directory(const Twine & path,bool & result)1098 std::error_code is_directory(const Twine &path, bool &result) {
1099 file_status st;
1100 if (std::error_code ec = status(path, st))
1101 return ec;
1102 result = is_directory(st);
1103 return std::error_code();
1104 }
1105
is_regular_file(const basic_file_status & status)1106 bool is_regular_file(const basic_file_status &status) {
1107 return status.type() == file_type::regular_file;
1108 }
1109
is_regular_file(const Twine & path,bool & result)1110 std::error_code is_regular_file(const Twine &path, bool &result) {
1111 file_status st;
1112 if (std::error_code ec = status(path, st))
1113 return ec;
1114 result = is_regular_file(st);
1115 return std::error_code();
1116 }
1117
is_symlink_file(const basic_file_status & status)1118 bool is_symlink_file(const basic_file_status &status) {
1119 return status.type() == file_type::symlink_file;
1120 }
1121
is_symlink_file(const Twine & path,bool & result)1122 std::error_code is_symlink_file(const Twine &path, bool &result) {
1123 file_status st;
1124 if (std::error_code ec = status(path, st, false))
1125 return ec;
1126 result = is_symlink_file(st);
1127 return std::error_code();
1128 }
1129
is_other(const basic_file_status & status)1130 bool is_other(const basic_file_status &status) {
1131 return exists(status) &&
1132 !is_regular_file(status) &&
1133 !is_directory(status);
1134 }
1135
is_other(const Twine & Path,bool & Result)1136 std::error_code is_other(const Twine &Path, bool &Result) {
1137 file_status FileStatus;
1138 if (std::error_code EC = status(Path, FileStatus))
1139 return EC;
1140 Result = is_other(FileStatus);
1141 return std::error_code();
1142 }
1143
replace_filename(const Twine & Filename,file_type Type,basic_file_status Status)1144 void directory_entry::replace_filename(const Twine &Filename, file_type Type,
1145 basic_file_status Status) {
1146 SmallString<128> PathStr = path::parent_path(Path);
1147 path::append(PathStr, Filename);
1148 this->Path = std::string(PathStr);
1149 this->Type = Type;
1150 this->Status = Status;
1151 }
1152
getPermissions(const Twine & Path)1153 ErrorOr<perms> getPermissions(const Twine &Path) {
1154 file_status Status;
1155 if (std::error_code EC = status(Path, Status))
1156 return EC;
1157
1158 return Status.permissions();
1159 }
1160
size() const1161 size_t mapped_file_region::size() const {
1162 assert(Mapping && "Mapping failed but used anyway!");
1163 return Size;
1164 }
1165
data() const1166 char *mapped_file_region::data() const {
1167 assert(Mapping && "Mapping failed but used anyway!");
1168 return reinterpret_cast<char *>(Mapping);
1169 }
1170
const_data() const1171 const char *mapped_file_region::const_data() const {
1172 assert(Mapping && "Mapping failed but used anyway!");
1173 return reinterpret_cast<const char *>(Mapping);
1174 }
1175
readNativeFileToEOF(file_t FileHandle,SmallVectorImpl<char> & Buffer,ssize_t ChunkSize)1176 Error readNativeFileToEOF(file_t FileHandle, SmallVectorImpl<char> &Buffer,
1177 ssize_t ChunkSize) {
1178 // Install a handler to truncate the buffer to the correct size on exit.
1179 size_t Size = Buffer.size();
1180 auto TruncateOnExit = make_scope_exit([&]() { Buffer.truncate(Size); });
1181
1182 // Read into Buffer until we hit EOF.
1183 for (;;) {
1184 Buffer.resize_for_overwrite(Size + ChunkSize);
1185 Expected<size_t> ReadBytes = readNativeFile(
1186 FileHandle, MutableArrayRef(Buffer.begin() + Size, ChunkSize));
1187 if (!ReadBytes)
1188 return ReadBytes.takeError();
1189 if (*ReadBytes == 0)
1190 return Error::success();
1191 Size += *ReadBytes;
1192 }
1193 }
1194
1195 } // end namespace fs
1196 } // end namespace sys
1197 } // end namespace llvm
1198
1199 // Include the truly platform-specific parts.
1200 #if defined(LLVM_ON_UNIX)
1201 #include "Unix/Path.inc"
1202 #endif
1203 #if defined(_WIN32)
1204 #include "Windows/Path.inc"
1205 #endif
1206
1207 namespace llvm {
1208 namespace sys {
1209 namespace fs {
1210
TempFile(StringRef Name,int FD)1211 TempFile::TempFile(StringRef Name, int FD)
1212 : TmpName(std::string(Name)), FD(FD) {}
TempFile(TempFile && Other)1213 TempFile::TempFile(TempFile &&Other) { *this = std::move(Other); }
operator =(TempFile && Other)1214 TempFile &TempFile::operator=(TempFile &&Other) {
1215 TmpName = std::move(Other.TmpName);
1216 FD = Other.FD;
1217 Other.Done = true;
1218 Other.FD = -1;
1219 #ifdef _WIN32
1220 RemoveOnClose = Other.RemoveOnClose;
1221 Other.RemoveOnClose = false;
1222 #endif
1223 return *this;
1224 }
1225
~TempFile()1226 TempFile::~TempFile() { assert(Done); }
1227
discard()1228 Error TempFile::discard() {
1229 Done = true;
1230 if (FD != -1 && close(FD) == -1) {
1231 std::error_code EC = std::error_code(errno, std::generic_category());
1232 return errorCodeToError(EC);
1233 }
1234 FD = -1;
1235
1236 #ifdef _WIN32
1237 // On Windows, closing will remove the file, if we set the delete
1238 // disposition. If not, remove it manually.
1239 bool Remove = RemoveOnClose;
1240 #else
1241 // Always try to remove the file.
1242 bool Remove = true;
1243 #endif
1244 std::error_code RemoveEC;
1245 if (Remove && !TmpName.empty()) {
1246 RemoveEC = fs::remove(TmpName);
1247 sys::DontRemoveFileOnSignal(TmpName);
1248 if (!RemoveEC)
1249 TmpName = "";
1250 } else {
1251 TmpName = "";
1252 }
1253 return errorCodeToError(RemoveEC);
1254 }
1255
keep(const Twine & Name)1256 Error TempFile::keep(const Twine &Name) {
1257 assert(!Done);
1258 Done = true;
1259 // Always try to close and rename.
1260 #ifdef _WIN32
1261 // If we can't cancel the delete don't rename.
1262 auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
1263 std::error_code RenameEC =
1264 RemoveOnClose ? std::error_code() : setDeleteDisposition(H, false);
1265 bool ShouldDelete = false;
1266 if (!RenameEC) {
1267 RenameEC = rename_handle(H, Name);
1268 // If rename failed because it's cross-device, copy instead
1269 if (RenameEC ==
1270 std::error_code(ERROR_NOT_SAME_DEVICE, std::system_category())) {
1271 RenameEC = copy_file(TmpName, Name);
1272 ShouldDelete = true;
1273 }
1274 }
1275
1276 // If we can't rename or copy, discard the temporary file.
1277 if (RenameEC)
1278 ShouldDelete = true;
1279 if (ShouldDelete) {
1280 if (!RemoveOnClose)
1281 setDeleteDisposition(H, true);
1282 else
1283 remove(TmpName);
1284 }
1285 #else
1286 std::error_code RenameEC = fs::rename(TmpName, Name);
1287 if (RenameEC) {
1288 // If we can't rename, try to copy to work around cross-device link issues.
1289 RenameEC = sys::fs::copy_file(TmpName, Name);
1290 // If we can't rename or copy, discard the temporary file.
1291 if (RenameEC)
1292 remove(TmpName);
1293 }
1294 #endif
1295 sys::DontRemoveFileOnSignal(TmpName);
1296
1297 if (!RenameEC)
1298 TmpName = "";
1299
1300 if (close(FD) == -1) {
1301 std::error_code EC(errno, std::generic_category());
1302 return errorCodeToError(EC);
1303 }
1304 FD = -1;
1305
1306 return errorCodeToError(RenameEC);
1307 }
1308
keep()1309 Error TempFile::keep() {
1310 assert(!Done);
1311 Done = true;
1312
1313 #ifdef _WIN32
1314 auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
1315 if (std::error_code EC = setDeleteDisposition(H, false))
1316 return errorCodeToError(EC);
1317 #endif
1318 sys::DontRemoveFileOnSignal(TmpName);
1319
1320 TmpName = "";
1321
1322 if (close(FD) == -1) {
1323 std::error_code EC(errno, std::generic_category());
1324 return errorCodeToError(EC);
1325 }
1326 FD = -1;
1327
1328 return Error::success();
1329 }
1330
create(const Twine & Model,unsigned Mode,OpenFlags ExtraFlags)1331 Expected<TempFile> TempFile::create(const Twine &Model, unsigned Mode,
1332 OpenFlags ExtraFlags) {
1333 int FD;
1334 SmallString<128> ResultPath;
1335 if (std::error_code EC =
1336 createUniqueFile(Model, FD, ResultPath, OF_Delete | ExtraFlags, Mode))
1337 return errorCodeToError(EC);
1338
1339 TempFile Ret(ResultPath, FD);
1340 #ifdef _WIN32
1341 auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
1342 bool SetSignalHandler = false;
1343 if (std::error_code EC = setDeleteDisposition(H, true)) {
1344 Ret.RemoveOnClose = true;
1345 SetSignalHandler = true;
1346 }
1347 #else
1348 bool SetSignalHandler = true;
1349 #endif
1350 if (SetSignalHandler && sys::RemoveFileOnSignal(ResultPath)) {
1351 // Make sure we delete the file when RemoveFileOnSignal fails.
1352 consumeError(Ret.discard());
1353 std::error_code EC(errc::operation_not_permitted);
1354 return errorCodeToError(EC);
1355 }
1356 return std::move(Ret);
1357 }
1358 } // namespace fs
1359
1360 } // namespace sys
1361 } // namespace llvm
1362