File: | lib/Support/VirtualFileSystem.cpp |
Warning: | line 1535, column 14 The left operand of '==' is a garbage value |
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1 | //===- VirtualFileSystem.cpp - Virtual File System Layer ------------------===// | |||
2 | // | |||
3 | // The LLVM Compiler Infrastructure | |||
4 | // | |||
5 | // This file is distributed under the University of Illinois Open Source | |||
6 | // License. See LICENSE.TXT for details. | |||
7 | // | |||
8 | //===----------------------------------------------------------------------===// | |||
9 | // | |||
10 | // This file implements the VirtualFileSystem interface. | |||
11 | // | |||
12 | //===----------------------------------------------------------------------===// | |||
13 | ||||
14 | #include "llvm/Support/VirtualFileSystem.h" | |||
15 | #include "llvm/ADT/ArrayRef.h" | |||
16 | #include "llvm/ADT/DenseMap.h" | |||
17 | #include "llvm/ADT/IntrusiveRefCntPtr.h" | |||
18 | #include "llvm/ADT/None.h" | |||
19 | #include "llvm/ADT/Optional.h" | |||
20 | #include "llvm/ADT/STLExtras.h" | |||
21 | #include "llvm/ADT/SmallString.h" | |||
22 | #include "llvm/ADT/SmallVector.h" | |||
23 | #include "llvm/ADT/StringRef.h" | |||
24 | #include "llvm/ADT/StringSet.h" | |||
25 | #include "llvm/ADT/Twine.h" | |||
26 | #include "llvm/ADT/iterator_range.h" | |||
27 | #include "llvm/Config/llvm-config.h" | |||
28 | #include "llvm/Support/Casting.h" | |||
29 | #include "llvm/Support/Chrono.h" | |||
30 | #include "llvm/Support/Compiler.h" | |||
31 | #include "llvm/Support/Debug.h" | |||
32 | #include "llvm/Support/Errc.h" | |||
33 | #include "llvm/Support/ErrorHandling.h" | |||
34 | #include "llvm/Support/ErrorOr.h" | |||
35 | #include "llvm/Support/FileSystem.h" | |||
36 | #include "llvm/Support/MemoryBuffer.h" | |||
37 | #include "llvm/Support/Path.h" | |||
38 | #include "llvm/Support/Process.h" | |||
39 | #include "llvm/Support/SMLoc.h" | |||
40 | #include "llvm/Support/SourceMgr.h" | |||
41 | #include "llvm/Support/YAMLParser.h" | |||
42 | #include "llvm/Support/raw_ostream.h" | |||
43 | #include <algorithm> | |||
44 | #include <atomic> | |||
45 | #include <cassert> | |||
46 | #include <cstdint> | |||
47 | #include <iterator> | |||
48 | #include <limits> | |||
49 | #include <map> | |||
50 | #include <memory> | |||
51 | #include <mutex> | |||
52 | #include <string> | |||
53 | #include <system_error> | |||
54 | #include <utility> | |||
55 | #include <vector> | |||
56 | ||||
57 | using namespace llvm; | |||
58 | using namespace llvm::vfs; | |||
59 | ||||
60 | using llvm::sys::fs::file_status; | |||
61 | using llvm::sys::fs::file_type; | |||
62 | using llvm::sys::fs::perms; | |||
63 | using llvm::sys::fs::UniqueID; | |||
64 | ||||
65 | Status::Status(const file_status &Status) | |||
66 | : UID(Status.getUniqueID()), MTime(Status.getLastModificationTime()), | |||
67 | User(Status.getUser()), Group(Status.getGroup()), Size(Status.getSize()), | |||
68 | Type(Status.type()), Perms(Status.permissions()) {} | |||
69 | ||||
70 | Status::Status(StringRef Name, UniqueID UID, sys::TimePoint<> MTime, | |||
71 | uint32_t User, uint32_t Group, uint64_t Size, file_type Type, | |||
72 | perms Perms) | |||
73 | : Name(Name), UID(UID), MTime(MTime), User(User), Group(Group), Size(Size), | |||
74 | Type(Type), Perms(Perms) {} | |||
75 | ||||
76 | Status Status::copyWithNewName(const Status &In, StringRef NewName) { | |||
77 | return Status(NewName, In.getUniqueID(), In.getLastModificationTime(), | |||
78 | In.getUser(), In.getGroup(), In.getSize(), In.getType(), | |||
79 | In.getPermissions()); | |||
80 | } | |||
81 | ||||
82 | Status Status::copyWithNewName(const file_status &In, StringRef NewName) { | |||
83 | return Status(NewName, In.getUniqueID(), In.getLastModificationTime(), | |||
84 | In.getUser(), In.getGroup(), In.getSize(), In.type(), | |||
85 | In.permissions()); | |||
86 | } | |||
87 | ||||
88 | bool Status::equivalent(const Status &Other) const { | |||
89 | assert(isStatusKnown() && Other.isStatusKnown())((isStatusKnown() && Other.isStatusKnown()) ? static_cast <void> (0) : __assert_fail ("isStatusKnown() && Other.isStatusKnown()" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 89, __PRETTY_FUNCTION__)); | |||
90 | return getUniqueID() == Other.getUniqueID(); | |||
91 | } | |||
92 | ||||
93 | bool Status::isDirectory() const { return Type == file_type::directory_file; } | |||
94 | ||||
95 | bool Status::isRegularFile() const { return Type == file_type::regular_file; } | |||
96 | ||||
97 | bool Status::isOther() const { | |||
98 | return exists() && !isRegularFile() && !isDirectory() && !isSymlink(); | |||
99 | } | |||
100 | ||||
101 | bool Status::isSymlink() const { return Type == file_type::symlink_file; } | |||
102 | ||||
103 | bool Status::isStatusKnown() const { return Type != file_type::status_error; } | |||
104 | ||||
105 | bool Status::exists() const { | |||
106 | return isStatusKnown() && Type != file_type::file_not_found; | |||
107 | } | |||
108 | ||||
109 | File::~File() = default; | |||
110 | ||||
111 | FileSystem::~FileSystem() = default; | |||
112 | ||||
113 | ErrorOr<std::unique_ptr<MemoryBuffer>> | |||
114 | FileSystem::getBufferForFile(const llvm::Twine &Name, int64_t FileSize, | |||
115 | bool RequiresNullTerminator, bool IsVolatile) { | |||
116 | auto F = openFileForRead(Name); | |||
117 | if (!F) | |||
118 | return F.getError(); | |||
119 | ||||
120 | return (*F)->getBuffer(Name, FileSize, RequiresNullTerminator, IsVolatile); | |||
121 | } | |||
122 | ||||
123 | std::error_code FileSystem::makeAbsolute(SmallVectorImpl<char> &Path) const { | |||
124 | if (llvm::sys::path::is_absolute(Path)) | |||
125 | return {}; | |||
126 | ||||
127 | auto WorkingDir = getCurrentWorkingDirectory(); | |||
128 | if (!WorkingDir) | |||
129 | return WorkingDir.getError(); | |||
130 | ||||
131 | return llvm::sys::fs::make_absolute(WorkingDir.get(), Path); | |||
132 | } | |||
133 | ||||
134 | std::error_code FileSystem::getRealPath(const Twine &Path, | |||
135 | SmallVectorImpl<char> &Output) const { | |||
136 | return errc::operation_not_permitted; | |||
137 | } | |||
138 | ||||
139 | std::error_code FileSystem::isLocal(const Twine &Path, bool &Result) { | |||
140 | return errc::operation_not_permitted; | |||
141 | } | |||
142 | ||||
143 | bool FileSystem::exists(const Twine &Path) { | |||
144 | auto Status = status(Path); | |||
145 | return Status && Status->exists(); | |||
146 | } | |||
147 | ||||
148 | #ifndef NDEBUG | |||
149 | static bool isTraversalComponent(StringRef Component) { | |||
150 | return Component.equals("..") || Component.equals("."); | |||
151 | } | |||
152 | ||||
153 | static bool pathHasTraversal(StringRef Path) { | |||
154 | using namespace llvm::sys; | |||
155 | ||||
156 | for (StringRef Comp : llvm::make_range(path::begin(Path), path::end(Path))) | |||
157 | if (isTraversalComponent(Comp)) | |||
158 | return true; | |||
159 | return false; | |||
160 | } | |||
161 | #endif | |||
162 | ||||
163 | //===-----------------------------------------------------------------------===/ | |||
164 | // RealFileSystem implementation | |||
165 | //===-----------------------------------------------------------------------===/ | |||
166 | ||||
167 | namespace { | |||
168 | ||||
169 | /// Wrapper around a raw file descriptor. | |||
170 | class RealFile : public File { | |||
171 | friend class RealFileSystem; | |||
172 | ||||
173 | int FD; | |||
174 | Status S; | |||
175 | std::string RealName; | |||
176 | ||||
177 | RealFile(int FD, StringRef NewName, StringRef NewRealPathName) | |||
178 | : FD(FD), S(NewName, {}, {}, {}, {}, {}, | |||
179 | llvm::sys::fs::file_type::status_error, {}), | |||
180 | RealName(NewRealPathName.str()) { | |||
181 | assert(FD >= 0 && "Invalid or inactive file descriptor")((FD >= 0 && "Invalid or inactive file descriptor" ) ? static_cast<void> (0) : __assert_fail ("FD >= 0 && \"Invalid or inactive file descriptor\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 181, __PRETTY_FUNCTION__)); | |||
182 | } | |||
183 | ||||
184 | public: | |||
185 | ~RealFile() override; | |||
186 | ||||
187 | ErrorOr<Status> status() override; | |||
188 | ErrorOr<std::string> getName() override; | |||
189 | ErrorOr<std::unique_ptr<MemoryBuffer>> getBuffer(const Twine &Name, | |||
190 | int64_t FileSize, | |||
191 | bool RequiresNullTerminator, | |||
192 | bool IsVolatile) override; | |||
193 | std::error_code close() override; | |||
194 | }; | |||
195 | ||||
196 | } // namespace | |||
197 | ||||
198 | RealFile::~RealFile() { close(); } | |||
199 | ||||
200 | ErrorOr<Status> RealFile::status() { | |||
201 | assert(FD != -1 && "cannot stat closed file")((FD != -1 && "cannot stat closed file") ? static_cast <void> (0) : __assert_fail ("FD != -1 && \"cannot stat closed file\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 201, __PRETTY_FUNCTION__)); | |||
202 | if (!S.isStatusKnown()) { | |||
203 | file_status RealStatus; | |||
204 | if (std::error_code EC = sys::fs::status(FD, RealStatus)) | |||
205 | return EC; | |||
206 | S = Status::copyWithNewName(RealStatus, S.getName()); | |||
207 | } | |||
208 | return S; | |||
209 | } | |||
210 | ||||
211 | ErrorOr<std::string> RealFile::getName() { | |||
212 | return RealName.empty() ? S.getName().str() : RealName; | |||
213 | } | |||
214 | ||||
215 | ErrorOr<std::unique_ptr<MemoryBuffer>> | |||
216 | RealFile::getBuffer(const Twine &Name, int64_t FileSize, | |||
217 | bool RequiresNullTerminator, bool IsVolatile) { | |||
218 | assert(FD != -1 && "cannot get buffer for closed file")((FD != -1 && "cannot get buffer for closed file") ? static_cast <void> (0) : __assert_fail ("FD != -1 && \"cannot get buffer for closed file\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 218, __PRETTY_FUNCTION__)); | |||
219 | return MemoryBuffer::getOpenFile(FD, Name, FileSize, RequiresNullTerminator, | |||
220 | IsVolatile); | |||
221 | } | |||
222 | ||||
223 | std::error_code RealFile::close() { | |||
224 | std::error_code EC = sys::Process::SafelyCloseFileDescriptor(FD); | |||
225 | FD = -1; | |||
226 | return EC; | |||
227 | } | |||
228 | ||||
229 | namespace { | |||
230 | ||||
231 | /// The file system according to your operating system. | |||
232 | class RealFileSystem : public FileSystem { | |||
233 | public: | |||
234 | ErrorOr<Status> status(const Twine &Path) override; | |||
235 | ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override; | |||
236 | directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override; | |||
237 | ||||
238 | llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override; | |||
239 | std::error_code setCurrentWorkingDirectory(const Twine &Path) override; | |||
240 | std::error_code isLocal(const Twine &Path, bool &Result) override; | |||
241 | std::error_code getRealPath(const Twine &Path, | |||
242 | SmallVectorImpl<char> &Output) const override; | |||
243 | ||||
244 | private: | |||
245 | mutable std::mutex CWDMutex; | |||
246 | mutable std::string CWDCache; | |||
247 | }; | |||
248 | ||||
249 | } // namespace | |||
250 | ||||
251 | ErrorOr<Status> RealFileSystem::status(const Twine &Path) { | |||
252 | sys::fs::file_status RealStatus; | |||
253 | if (std::error_code EC = sys::fs::status(Path, RealStatus)) | |||
254 | return EC; | |||
255 | return Status::copyWithNewName(RealStatus, Path.str()); | |||
256 | } | |||
257 | ||||
258 | ErrorOr<std::unique_ptr<File>> | |||
259 | RealFileSystem::openFileForRead(const Twine &Name) { | |||
260 | int FD; | |||
261 | SmallString<256> RealName; | |||
262 | if (std::error_code EC = | |||
263 | sys::fs::openFileForRead(Name, FD, sys::fs::OF_None, &RealName)) | |||
264 | return EC; | |||
265 | return std::unique_ptr<File>(new RealFile(FD, Name.str(), RealName.str())); | |||
266 | } | |||
267 | ||||
268 | llvm::ErrorOr<std::string> RealFileSystem::getCurrentWorkingDirectory() const { | |||
269 | std::lock_guard<std::mutex> Lock(CWDMutex); | |||
270 | if (!CWDCache.empty()) | |||
271 | return CWDCache; | |||
272 | SmallString<256> Dir; | |||
273 | if (std::error_code EC = llvm::sys::fs::current_path(Dir)) | |||
274 | return EC; | |||
275 | CWDCache = Dir.str(); | |||
276 | return CWDCache; | |||
277 | } | |||
278 | ||||
279 | std::error_code RealFileSystem::setCurrentWorkingDirectory(const Twine &Path) { | |||
280 | // FIXME: chdir is thread hostile; on the other hand, creating the same | |||
281 | // behavior as chdir is complex: chdir resolves the path once, thus | |||
282 | // guaranteeing that all subsequent relative path operations work | |||
283 | // on the same path the original chdir resulted in. This makes a | |||
284 | // difference for example on network filesystems, where symlinks might be | |||
285 | // switched during runtime of the tool. Fixing this depends on having a | |||
286 | // file system abstraction that allows openat() style interactions. | |||
287 | if (auto EC = llvm::sys::fs::set_current_path(Path)) | |||
288 | return EC; | |||
289 | ||||
290 | // Invalidate cache. | |||
291 | std::lock_guard<std::mutex> Lock(CWDMutex); | |||
292 | CWDCache.clear(); | |||
293 | return std::error_code(); | |||
294 | } | |||
295 | ||||
296 | std::error_code RealFileSystem::isLocal(const Twine &Path, bool &Result) { | |||
297 | return llvm::sys::fs::is_local(Path, Result); | |||
298 | } | |||
299 | ||||
300 | std::error_code | |||
301 | RealFileSystem::getRealPath(const Twine &Path, | |||
302 | SmallVectorImpl<char> &Output) const { | |||
303 | return llvm::sys::fs::real_path(Path, Output); | |||
304 | } | |||
305 | ||||
306 | IntrusiveRefCntPtr<FileSystem> vfs::getRealFileSystem() { | |||
307 | static IntrusiveRefCntPtr<FileSystem> FS = new RealFileSystem(); | |||
308 | return FS; | |||
309 | } | |||
310 | ||||
311 | namespace { | |||
312 | ||||
313 | class RealFSDirIter : public llvm::vfs::detail::DirIterImpl { | |||
314 | llvm::sys::fs::directory_iterator Iter; | |||
315 | ||||
316 | public: | |||
317 | RealFSDirIter(const Twine &Path, std::error_code &EC) : Iter(Path, EC) { | |||
318 | if (Iter != llvm::sys::fs::directory_iterator()) | |||
319 | CurrentEntry = directory_entry(Iter->path(), Iter->type()); | |||
320 | } | |||
321 | ||||
322 | std::error_code increment() override { | |||
323 | std::error_code EC; | |||
324 | Iter.increment(EC); | |||
325 | CurrentEntry = (Iter == llvm::sys::fs::directory_iterator()) | |||
326 | ? directory_entry() | |||
327 | : directory_entry(Iter->path(), Iter->type()); | |||
328 | return EC; | |||
329 | } | |||
330 | }; | |||
331 | ||||
332 | } // namespace | |||
333 | ||||
334 | directory_iterator RealFileSystem::dir_begin(const Twine &Dir, | |||
335 | std::error_code &EC) { | |||
336 | return directory_iterator(std::make_shared<RealFSDirIter>(Dir, EC)); | |||
337 | } | |||
338 | ||||
339 | //===-----------------------------------------------------------------------===/ | |||
340 | // OverlayFileSystem implementation | |||
341 | //===-----------------------------------------------------------------------===/ | |||
342 | ||||
343 | OverlayFileSystem::OverlayFileSystem(IntrusiveRefCntPtr<FileSystem> BaseFS) { | |||
344 | FSList.push_back(std::move(BaseFS)); | |||
345 | } | |||
346 | ||||
347 | void OverlayFileSystem::pushOverlay(IntrusiveRefCntPtr<FileSystem> FS) { | |||
348 | FSList.push_back(FS); | |||
349 | // Synchronize added file systems by duplicating the working directory from | |||
350 | // the first one in the list. | |||
351 | FS->setCurrentWorkingDirectory(getCurrentWorkingDirectory().get()); | |||
352 | } | |||
353 | ||||
354 | ErrorOr<Status> OverlayFileSystem::status(const Twine &Path) { | |||
355 | // FIXME: handle symlinks that cross file systems | |||
356 | for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) { | |||
357 | ErrorOr<Status> Status = (*I)->status(Path); | |||
358 | if (Status || Status.getError() != llvm::errc::no_such_file_or_directory) | |||
359 | return Status; | |||
360 | } | |||
361 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
362 | } | |||
363 | ||||
364 | ErrorOr<std::unique_ptr<File>> | |||
365 | OverlayFileSystem::openFileForRead(const llvm::Twine &Path) { | |||
366 | // FIXME: handle symlinks that cross file systems | |||
367 | for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) { | |||
368 | auto Result = (*I)->openFileForRead(Path); | |||
369 | if (Result || Result.getError() != llvm::errc::no_such_file_or_directory) | |||
370 | return Result; | |||
371 | } | |||
372 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
373 | } | |||
374 | ||||
375 | llvm::ErrorOr<std::string> | |||
376 | OverlayFileSystem::getCurrentWorkingDirectory() const { | |||
377 | // All file systems are synchronized, just take the first working directory. | |||
378 | return FSList.front()->getCurrentWorkingDirectory(); | |||
379 | } | |||
380 | ||||
381 | std::error_code | |||
382 | OverlayFileSystem::setCurrentWorkingDirectory(const Twine &Path) { | |||
383 | for (auto &FS : FSList) | |||
384 | if (std::error_code EC = FS->setCurrentWorkingDirectory(Path)) | |||
385 | return EC; | |||
386 | return {}; | |||
387 | } | |||
388 | ||||
389 | std::error_code OverlayFileSystem::isLocal(const Twine &Path, bool &Result) { | |||
390 | for (auto &FS : FSList) | |||
391 | if (FS->exists(Path)) | |||
392 | return FS->isLocal(Path, Result); | |||
393 | return errc::no_such_file_or_directory; | |||
394 | } | |||
395 | ||||
396 | std::error_code | |||
397 | OverlayFileSystem::getRealPath(const Twine &Path, | |||
398 | SmallVectorImpl<char> &Output) const { | |||
399 | for (auto &FS : FSList) | |||
400 | if (FS->exists(Path)) | |||
401 | return FS->getRealPath(Path, Output); | |||
402 | return errc::no_such_file_or_directory; | |||
403 | } | |||
404 | ||||
405 | llvm::vfs::detail::DirIterImpl::~DirIterImpl() = default; | |||
406 | ||||
407 | namespace { | |||
408 | ||||
409 | class OverlayFSDirIterImpl : public llvm::vfs::detail::DirIterImpl { | |||
410 | OverlayFileSystem &Overlays; | |||
411 | std::string Path; | |||
412 | OverlayFileSystem::iterator CurrentFS; | |||
413 | directory_iterator CurrentDirIter; | |||
414 | llvm::StringSet<> SeenNames; | |||
415 | ||||
416 | std::error_code incrementFS() { | |||
417 | assert(CurrentFS != Overlays.overlays_end() && "incrementing past end")((CurrentFS != Overlays.overlays_end() && "incrementing past end" ) ? static_cast<void> (0) : __assert_fail ("CurrentFS != Overlays.overlays_end() && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 417, __PRETTY_FUNCTION__)); | |||
418 | ++CurrentFS; | |||
419 | for (auto E = Overlays.overlays_end(); CurrentFS != E; ++CurrentFS) { | |||
420 | std::error_code EC; | |||
421 | CurrentDirIter = (*CurrentFS)->dir_begin(Path, EC); | |||
422 | if (EC && EC != errc::no_such_file_or_directory) | |||
423 | return EC; | |||
424 | if (CurrentDirIter != directory_iterator()) | |||
425 | break; // found | |||
426 | } | |||
427 | return {}; | |||
428 | } | |||
429 | ||||
430 | std::error_code incrementDirIter(bool IsFirstTime) { | |||
431 | assert((IsFirstTime || CurrentDirIter != directory_iterator()) &&(((IsFirstTime || CurrentDirIter != directory_iterator()) && "incrementing past end") ? static_cast<void> (0) : __assert_fail ("(IsFirstTime || CurrentDirIter != directory_iterator()) && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 432, __PRETTY_FUNCTION__)) | |||
432 | "incrementing past end")(((IsFirstTime || CurrentDirIter != directory_iterator()) && "incrementing past end") ? static_cast<void> (0) : __assert_fail ("(IsFirstTime || CurrentDirIter != directory_iterator()) && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 432, __PRETTY_FUNCTION__)); | |||
433 | std::error_code EC; | |||
434 | if (!IsFirstTime) | |||
435 | CurrentDirIter.increment(EC); | |||
436 | if (!EC && CurrentDirIter == directory_iterator()) | |||
437 | EC = incrementFS(); | |||
438 | return EC; | |||
439 | } | |||
440 | ||||
441 | std::error_code incrementImpl(bool IsFirstTime) { | |||
442 | while (true) { | |||
443 | std::error_code EC = incrementDirIter(IsFirstTime); | |||
444 | if (EC || CurrentDirIter == directory_iterator()) { | |||
445 | CurrentEntry = directory_entry(); | |||
446 | return EC; | |||
447 | } | |||
448 | CurrentEntry = *CurrentDirIter; | |||
449 | StringRef Name = llvm::sys::path::filename(CurrentEntry.path()); | |||
450 | if (SeenNames.insert(Name).second) | |||
451 | return EC; // name not seen before | |||
452 | } | |||
453 | llvm_unreachable("returned above")::llvm::llvm_unreachable_internal("returned above", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 453); | |||
454 | } | |||
455 | ||||
456 | public: | |||
457 | OverlayFSDirIterImpl(const Twine &Path, OverlayFileSystem &FS, | |||
458 | std::error_code &EC) | |||
459 | : Overlays(FS), Path(Path.str()), CurrentFS(Overlays.overlays_begin()) { | |||
460 | CurrentDirIter = (*CurrentFS)->dir_begin(Path, EC); | |||
461 | EC = incrementImpl(true); | |||
462 | } | |||
463 | ||||
464 | std::error_code increment() override { return incrementImpl(false); } | |||
465 | }; | |||
466 | ||||
467 | } // namespace | |||
468 | ||||
469 | directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir, | |||
470 | std::error_code &EC) { | |||
471 | return directory_iterator( | |||
472 | std::make_shared<OverlayFSDirIterImpl>(Dir, *this, EC)); | |||
473 | } | |||
474 | ||||
475 | namespace llvm { | |||
476 | namespace vfs { | |||
477 | ||||
478 | namespace detail { | |||
479 | ||||
480 | enum InMemoryNodeKind { IME_File, IME_Directory, IME_HardLink }; | |||
481 | ||||
482 | /// The in memory file system is a tree of Nodes. Every node can either be a | |||
483 | /// file , hardlink or a directory. | |||
484 | class InMemoryNode { | |||
485 | InMemoryNodeKind Kind; | |||
486 | std::string FileName; | |||
487 | ||||
488 | public: | |||
489 | InMemoryNode(llvm::StringRef FileName, InMemoryNodeKind Kind) | |||
490 | : Kind(Kind), FileName(llvm::sys::path::filename(FileName)) {} | |||
491 | virtual ~InMemoryNode() = default; | |||
492 | ||||
493 | /// Get the filename of this node (the name without the directory part). | |||
494 | StringRef getFileName() const { return FileName; } | |||
495 | InMemoryNodeKind getKind() const { return Kind; } | |||
496 | virtual std::string toString(unsigned Indent) const = 0; | |||
497 | }; | |||
498 | ||||
499 | class InMemoryFile : public InMemoryNode { | |||
500 | Status Stat; | |||
501 | std::unique_ptr<llvm::MemoryBuffer> Buffer; | |||
502 | ||||
503 | public: | |||
504 | InMemoryFile(Status Stat, std::unique_ptr<llvm::MemoryBuffer> Buffer) | |||
505 | : InMemoryNode(Stat.getName(), IME_File), Stat(std::move(Stat)), | |||
506 | Buffer(std::move(Buffer)) {} | |||
507 | ||||
508 | /// Return the \p Status for this node. \p RequestedName should be the name | |||
509 | /// through which the caller referred to this node. It will override | |||
510 | /// \p Status::Name in the return value, to mimic the behavior of \p RealFile. | |||
511 | Status getStatus(StringRef RequestedName) const { | |||
512 | return Status::copyWithNewName(Stat, RequestedName); | |||
513 | } | |||
514 | llvm::MemoryBuffer *getBuffer() const { return Buffer.get(); } | |||
515 | ||||
516 | std::string toString(unsigned Indent) const override { | |||
517 | return (std::string(Indent, ' ') + Stat.getName() + "\n").str(); | |||
518 | } | |||
519 | ||||
520 | static bool classof(const InMemoryNode *N) { | |||
521 | return N->getKind() == IME_File; | |||
522 | } | |||
523 | }; | |||
524 | ||||
525 | namespace { | |||
526 | ||||
527 | class InMemoryHardLink : public InMemoryNode { | |||
528 | const InMemoryFile &ResolvedFile; | |||
529 | ||||
530 | public: | |||
531 | InMemoryHardLink(StringRef Path, const InMemoryFile &ResolvedFile) | |||
532 | : InMemoryNode(Path, IME_HardLink), ResolvedFile(ResolvedFile) {} | |||
533 | const InMemoryFile &getResolvedFile() const { return ResolvedFile; } | |||
534 | ||||
535 | std::string toString(unsigned Indent) const override { | |||
536 | return std::string(Indent, ' ') + "HardLink to -> " + | |||
537 | ResolvedFile.toString(0); | |||
538 | } | |||
539 | ||||
540 | static bool classof(const InMemoryNode *N) { | |||
541 | return N->getKind() == IME_HardLink; | |||
542 | } | |||
543 | }; | |||
544 | ||||
545 | /// Adapt a InMemoryFile for VFS' File interface. The goal is to make | |||
546 | /// \p InMemoryFileAdaptor mimic as much as possible the behavior of | |||
547 | /// \p RealFile. | |||
548 | class InMemoryFileAdaptor : public File { | |||
549 | const InMemoryFile &Node; | |||
550 | /// The name to use when returning a Status for this file. | |||
551 | std::string RequestedName; | |||
552 | ||||
553 | public: | |||
554 | explicit InMemoryFileAdaptor(const InMemoryFile &Node, | |||
555 | std::string RequestedName) | |||
556 | : Node(Node), RequestedName(std::move(RequestedName)) {} | |||
557 | ||||
558 | llvm::ErrorOr<Status> status() override { | |||
559 | return Node.getStatus(RequestedName); | |||
560 | } | |||
561 | ||||
562 | llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> | |||
563 | getBuffer(const Twine &Name, int64_t FileSize, bool RequiresNullTerminator, | |||
564 | bool IsVolatile) override { | |||
565 | llvm::MemoryBuffer *Buf = Node.getBuffer(); | |||
566 | return llvm::MemoryBuffer::getMemBuffer( | |||
567 | Buf->getBuffer(), Buf->getBufferIdentifier(), RequiresNullTerminator); | |||
568 | } | |||
569 | ||||
570 | std::error_code close() override { return {}; } | |||
571 | }; | |||
572 | } // namespace | |||
573 | ||||
574 | class InMemoryDirectory : public InMemoryNode { | |||
575 | Status Stat; | |||
576 | llvm::StringMap<std::unique_ptr<InMemoryNode>> Entries; | |||
577 | ||||
578 | public: | |||
579 | InMemoryDirectory(Status Stat) | |||
580 | : InMemoryNode(Stat.getName(), IME_Directory), Stat(std::move(Stat)) {} | |||
581 | ||||
582 | /// Return the \p Status for this node. \p RequestedName should be the name | |||
583 | /// through which the caller referred to this node. It will override | |||
584 | /// \p Status::Name in the return value, to mimic the behavior of \p RealFile. | |||
585 | Status getStatus(StringRef RequestedName) const { | |||
586 | return Status::copyWithNewName(Stat, RequestedName); | |||
587 | } | |||
588 | InMemoryNode *getChild(StringRef Name) { | |||
589 | auto I = Entries.find(Name); | |||
590 | if (I != Entries.end()) | |||
591 | return I->second.get(); | |||
592 | return nullptr; | |||
593 | } | |||
594 | ||||
595 | InMemoryNode *addChild(StringRef Name, std::unique_ptr<InMemoryNode> Child) { | |||
596 | return Entries.insert(make_pair(Name, std::move(Child))) | |||
597 | .first->second.get(); | |||
598 | } | |||
599 | ||||
600 | using const_iterator = decltype(Entries)::const_iterator; | |||
601 | ||||
602 | const_iterator begin() const { return Entries.begin(); } | |||
603 | const_iterator end() const { return Entries.end(); } | |||
604 | ||||
605 | std::string toString(unsigned Indent) const override { | |||
606 | std::string Result = | |||
607 | (std::string(Indent, ' ') + Stat.getName() + "\n").str(); | |||
608 | for (const auto &Entry : Entries) | |||
609 | Result += Entry.second->toString(Indent + 2); | |||
610 | return Result; | |||
611 | } | |||
612 | ||||
613 | static bool classof(const InMemoryNode *N) { | |||
614 | return N->getKind() == IME_Directory; | |||
615 | } | |||
616 | }; | |||
617 | ||||
618 | namespace { | |||
619 | Status getNodeStatus(const InMemoryNode *Node, StringRef RequestedName) { | |||
620 | if (auto Dir = dyn_cast<detail::InMemoryDirectory>(Node)) | |||
621 | return Dir->getStatus(RequestedName); | |||
622 | if (auto File = dyn_cast<detail::InMemoryFile>(Node)) | |||
623 | return File->getStatus(RequestedName); | |||
624 | if (auto Link = dyn_cast<detail::InMemoryHardLink>(Node)) | |||
625 | return Link->getResolvedFile().getStatus(RequestedName); | |||
626 | llvm_unreachable("Unknown node type")::llvm::llvm_unreachable_internal("Unknown node type", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 626); | |||
627 | } | |||
628 | } // namespace | |||
629 | } // namespace detail | |||
630 | ||||
631 | InMemoryFileSystem::InMemoryFileSystem(bool UseNormalizedPaths) | |||
632 | : Root(new detail::InMemoryDirectory( | |||
633 | Status("", getNextVirtualUniqueID(), llvm::sys::TimePoint<>(), 0, 0, | |||
634 | 0, llvm::sys::fs::file_type::directory_file, | |||
635 | llvm::sys::fs::perms::all_all))), | |||
636 | UseNormalizedPaths(UseNormalizedPaths) {} | |||
637 | ||||
638 | InMemoryFileSystem::~InMemoryFileSystem() = default; | |||
639 | ||||
640 | std::string InMemoryFileSystem::toString() const { | |||
641 | return Root->toString(/*Indent=*/0); | |||
642 | } | |||
643 | ||||
644 | bool InMemoryFileSystem::addFile(const Twine &P, time_t ModificationTime, | |||
645 | std::unique_ptr<llvm::MemoryBuffer> Buffer, | |||
646 | Optional<uint32_t> User, | |||
647 | Optional<uint32_t> Group, | |||
648 | Optional<llvm::sys::fs::file_type> Type, | |||
649 | Optional<llvm::sys::fs::perms> Perms, | |||
650 | const detail::InMemoryFile *HardLinkTarget) { | |||
651 | SmallString<128> Path; | |||
652 | P.toVector(Path); | |||
653 | ||||
654 | // Fix up relative paths. This just prepends the current working directory. | |||
655 | std::error_code EC = makeAbsolute(Path); | |||
656 | assert(!EC)((!EC) ? static_cast<void> (0) : __assert_fail ("!EC", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 656, __PRETTY_FUNCTION__)); | |||
657 | (void)EC; | |||
658 | ||||
659 | if (useNormalizedPaths()) | |||
660 | llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true); | |||
661 | ||||
662 | if (Path.empty()) | |||
663 | return false; | |||
664 | ||||
665 | detail::InMemoryDirectory *Dir = Root.get(); | |||
666 | auto I = llvm::sys::path::begin(Path), E = sys::path::end(Path); | |||
667 | const auto ResolvedUser = User.getValueOr(0); | |||
668 | const auto ResolvedGroup = Group.getValueOr(0); | |||
669 | const auto ResolvedType = Type.getValueOr(sys::fs::file_type::regular_file); | |||
670 | const auto ResolvedPerms = Perms.getValueOr(sys::fs::all_all); | |||
671 | assert(!(HardLinkTarget && Buffer) && "HardLink cannot have a buffer")((!(HardLinkTarget && Buffer) && "HardLink cannot have a buffer" ) ? static_cast<void> (0) : __assert_fail ("!(HardLinkTarget && Buffer) && \"HardLink cannot have a buffer\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 671, __PRETTY_FUNCTION__)); | |||
672 | // Any intermediate directories we create should be accessible by | |||
673 | // the owner, even if Perms says otherwise for the final path. | |||
674 | const auto NewDirectoryPerms = ResolvedPerms | sys::fs::owner_all; | |||
675 | while (true) { | |||
676 | StringRef Name = *I; | |||
677 | detail::InMemoryNode *Node = Dir->getChild(Name); | |||
678 | ++I; | |||
679 | if (!Node) { | |||
680 | if (I == E) { | |||
681 | // End of the path. | |||
682 | std::unique_ptr<detail::InMemoryNode> Child; | |||
683 | if (HardLinkTarget) | |||
684 | Child.reset(new detail::InMemoryHardLink(P.str(), *HardLinkTarget)); | |||
685 | else { | |||
686 | // Create a new file or directory. | |||
687 | Status Stat(P.str(), getNextVirtualUniqueID(), | |||
688 | llvm::sys::toTimePoint(ModificationTime), ResolvedUser, | |||
689 | ResolvedGroup, Buffer->getBufferSize(), ResolvedType, | |||
690 | ResolvedPerms); | |||
691 | if (ResolvedType == sys::fs::file_type::directory_file) { | |||
692 | Child.reset(new detail::InMemoryDirectory(std::move(Stat))); | |||
693 | } else { | |||
694 | Child.reset( | |||
695 | new detail::InMemoryFile(std::move(Stat), std::move(Buffer))); | |||
696 | } | |||
697 | } | |||
698 | Dir->addChild(Name, std::move(Child)); | |||
699 | return true; | |||
700 | } | |||
701 | ||||
702 | // Create a new directory. Use the path up to here. | |||
703 | Status Stat( | |||
704 | StringRef(Path.str().begin(), Name.end() - Path.str().begin()), | |||
705 | getNextVirtualUniqueID(), llvm::sys::toTimePoint(ModificationTime), | |||
706 | ResolvedUser, ResolvedGroup, 0, sys::fs::file_type::directory_file, | |||
707 | NewDirectoryPerms); | |||
708 | Dir = cast<detail::InMemoryDirectory>(Dir->addChild( | |||
709 | Name, llvm::make_unique<detail::InMemoryDirectory>(std::move(Stat)))); | |||
710 | continue; | |||
711 | } | |||
712 | ||||
713 | if (auto *NewDir = dyn_cast<detail::InMemoryDirectory>(Node)) { | |||
714 | Dir = NewDir; | |||
715 | } else { | |||
716 | assert((isa<detail::InMemoryFile>(Node) ||(((isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink >(Node)) && "Must be either file, hardlink or directory!" ) ? static_cast<void> (0) : __assert_fail ("(isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink>(Node)) && \"Must be either file, hardlink or directory!\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 718, __PRETTY_FUNCTION__)) | |||
717 | isa<detail::InMemoryHardLink>(Node)) &&(((isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink >(Node)) && "Must be either file, hardlink or directory!" ) ? static_cast<void> (0) : __assert_fail ("(isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink>(Node)) && \"Must be either file, hardlink or directory!\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 718, __PRETTY_FUNCTION__)) | |||
718 | "Must be either file, hardlink or directory!")(((isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink >(Node)) && "Must be either file, hardlink or directory!" ) ? static_cast<void> (0) : __assert_fail ("(isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink>(Node)) && \"Must be either file, hardlink or directory!\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 718, __PRETTY_FUNCTION__)); | |||
719 | ||||
720 | // Trying to insert a directory in place of a file. | |||
721 | if (I != E) | |||
722 | return false; | |||
723 | ||||
724 | // Return false only if the new file is different from the existing one. | |||
725 | if (auto Link = dyn_cast<detail::InMemoryHardLink>(Node)) { | |||
726 | return Link->getResolvedFile().getBuffer()->getBuffer() == | |||
727 | Buffer->getBuffer(); | |||
728 | } | |||
729 | return cast<detail::InMemoryFile>(Node)->getBuffer()->getBuffer() == | |||
730 | Buffer->getBuffer(); | |||
731 | } | |||
732 | } | |||
733 | } | |||
734 | ||||
735 | bool InMemoryFileSystem::addFile(const Twine &P, time_t ModificationTime, | |||
736 | std::unique_ptr<llvm::MemoryBuffer> Buffer, | |||
737 | Optional<uint32_t> User, | |||
738 | Optional<uint32_t> Group, | |||
739 | Optional<llvm::sys::fs::file_type> Type, | |||
740 | Optional<llvm::sys::fs::perms> Perms) { | |||
741 | return addFile(P, ModificationTime, std::move(Buffer), User, Group, Type, | |||
742 | Perms, /*HardLinkTarget=*/nullptr); | |||
743 | } | |||
744 | ||||
745 | bool InMemoryFileSystem::addFileNoOwn(const Twine &P, time_t ModificationTime, | |||
746 | llvm::MemoryBuffer *Buffer, | |||
747 | Optional<uint32_t> User, | |||
748 | Optional<uint32_t> Group, | |||
749 | Optional<llvm::sys::fs::file_type> Type, | |||
750 | Optional<llvm::sys::fs::perms> Perms) { | |||
751 | return addFile(P, ModificationTime, | |||
752 | llvm::MemoryBuffer::getMemBuffer( | |||
753 | Buffer->getBuffer(), Buffer->getBufferIdentifier()), | |||
754 | std::move(User), std::move(Group), std::move(Type), | |||
755 | std::move(Perms)); | |||
756 | } | |||
757 | ||||
758 | static ErrorOr<const detail::InMemoryNode *> | |||
759 | lookupInMemoryNode(const InMemoryFileSystem &FS, detail::InMemoryDirectory *Dir, | |||
760 | const Twine &P) { | |||
761 | SmallString<128> Path; | |||
762 | P.toVector(Path); | |||
763 | ||||
764 | // Fix up relative paths. This just prepends the current working directory. | |||
765 | std::error_code EC = FS.makeAbsolute(Path); | |||
766 | assert(!EC)((!EC) ? static_cast<void> (0) : __assert_fail ("!EC", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 766, __PRETTY_FUNCTION__)); | |||
767 | (void)EC; | |||
768 | ||||
769 | if (FS.useNormalizedPaths()) | |||
770 | llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true); | |||
771 | ||||
772 | if (Path.empty()) | |||
773 | return Dir; | |||
774 | ||||
775 | auto I = llvm::sys::path::begin(Path), E = llvm::sys::path::end(Path); | |||
776 | while (true) { | |||
777 | detail::InMemoryNode *Node = Dir->getChild(*I); | |||
778 | ++I; | |||
779 | if (!Node) | |||
780 | return errc::no_such_file_or_directory; | |||
781 | ||||
782 | // Return the file if it's at the end of the path. | |||
783 | if (auto File = dyn_cast<detail::InMemoryFile>(Node)) { | |||
784 | if (I == E) | |||
785 | return File; | |||
786 | return errc::no_such_file_or_directory; | |||
787 | } | |||
788 | ||||
789 | // If Node is HardLink then return the resolved file. | |||
790 | if (auto File = dyn_cast<detail::InMemoryHardLink>(Node)) { | |||
791 | if (I == E) | |||
792 | return &File->getResolvedFile(); | |||
793 | return errc::no_such_file_or_directory; | |||
794 | } | |||
795 | // Traverse directories. | |||
796 | Dir = cast<detail::InMemoryDirectory>(Node); | |||
797 | if (I == E) | |||
798 | return Dir; | |||
799 | } | |||
800 | } | |||
801 | ||||
802 | bool InMemoryFileSystem::addHardLink(const Twine &FromPath, | |||
803 | const Twine &ToPath) { | |||
804 | auto FromNode = lookupInMemoryNode(*this, Root.get(), FromPath); | |||
805 | auto ToNode = lookupInMemoryNode(*this, Root.get(), ToPath); | |||
806 | // FromPath must not have been added before. ToPath must have been added | |||
807 | // before. Resolved ToPath must be a File. | |||
808 | if (!ToNode || FromNode || !isa<detail::InMemoryFile>(*ToNode)) | |||
809 | return false; | |||
810 | return this->addFile(FromPath, 0, nullptr, None, None, None, None, | |||
811 | cast<detail::InMemoryFile>(*ToNode)); | |||
812 | } | |||
813 | ||||
814 | llvm::ErrorOr<Status> InMemoryFileSystem::status(const Twine &Path) { | |||
815 | auto Node = lookupInMemoryNode(*this, Root.get(), Path); | |||
816 | if (Node) | |||
817 | return detail::getNodeStatus(*Node, Path.str()); | |||
818 | return Node.getError(); | |||
819 | } | |||
820 | ||||
821 | llvm::ErrorOr<std::unique_ptr<File>> | |||
822 | InMemoryFileSystem::openFileForRead(const Twine &Path) { | |||
823 | auto Node = lookupInMemoryNode(*this, Root.get(), Path); | |||
824 | if (!Node) | |||
825 | return Node.getError(); | |||
826 | ||||
827 | // When we have a file provide a heap-allocated wrapper for the memory buffer | |||
828 | // to match the ownership semantics for File. | |||
829 | if (auto *F = dyn_cast<detail::InMemoryFile>(*Node)) | |||
830 | return std::unique_ptr<File>( | |||
831 | new detail::InMemoryFileAdaptor(*F, Path.str())); | |||
832 | ||||
833 | // FIXME: errc::not_a_file? | |||
834 | return make_error_code(llvm::errc::invalid_argument); | |||
835 | } | |||
836 | ||||
837 | namespace { | |||
838 | ||||
839 | /// Adaptor from InMemoryDir::iterator to directory_iterator. | |||
840 | class InMemoryDirIterator : public llvm::vfs::detail::DirIterImpl { | |||
841 | detail::InMemoryDirectory::const_iterator I; | |||
842 | detail::InMemoryDirectory::const_iterator E; | |||
843 | std::string RequestedDirName; | |||
844 | ||||
845 | void setCurrentEntry() { | |||
846 | if (I != E) { | |||
847 | SmallString<256> Path(RequestedDirName); | |||
848 | llvm::sys::path::append(Path, I->second->getFileName()); | |||
849 | sys::fs::file_type Type; | |||
850 | switch (I->second->getKind()) { | |||
851 | case detail::IME_File: | |||
852 | case detail::IME_HardLink: | |||
853 | Type = sys::fs::file_type::regular_file; | |||
854 | break; | |||
855 | case detail::IME_Directory: | |||
856 | Type = sys::fs::file_type::directory_file; | |||
857 | break; | |||
858 | } | |||
859 | CurrentEntry = directory_entry(Path.str(), Type); | |||
860 | } else { | |||
861 | // When we're at the end, make CurrentEntry invalid and DirIterImpl will | |||
862 | // do the rest. | |||
863 | CurrentEntry = directory_entry(); | |||
864 | } | |||
865 | } | |||
866 | ||||
867 | public: | |||
868 | InMemoryDirIterator() = default; | |||
869 | ||||
870 | explicit InMemoryDirIterator(const detail::InMemoryDirectory &Dir, | |||
871 | std::string RequestedDirName) | |||
872 | : I(Dir.begin()), E(Dir.end()), | |||
873 | RequestedDirName(std::move(RequestedDirName)) { | |||
874 | setCurrentEntry(); | |||
875 | } | |||
876 | ||||
877 | std::error_code increment() override { | |||
878 | ++I; | |||
879 | setCurrentEntry(); | |||
880 | return {}; | |||
881 | } | |||
882 | }; | |||
883 | ||||
884 | } // namespace | |||
885 | ||||
886 | directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir, | |||
887 | std::error_code &EC) { | |||
888 | auto Node = lookupInMemoryNode(*this, Root.get(), Dir); | |||
889 | if (!Node) { | |||
890 | EC = Node.getError(); | |||
891 | return directory_iterator(std::make_shared<InMemoryDirIterator>()); | |||
892 | } | |||
893 | ||||
894 | if (auto *DirNode = dyn_cast<detail::InMemoryDirectory>(*Node)) | |||
895 | return directory_iterator( | |||
896 | std::make_shared<InMemoryDirIterator>(*DirNode, Dir.str())); | |||
897 | ||||
898 | EC = make_error_code(llvm::errc::not_a_directory); | |||
899 | return directory_iterator(std::make_shared<InMemoryDirIterator>()); | |||
900 | } | |||
901 | ||||
902 | std::error_code InMemoryFileSystem::setCurrentWorkingDirectory(const Twine &P) { | |||
903 | SmallString<128> Path; | |||
904 | P.toVector(Path); | |||
905 | ||||
906 | // Fix up relative paths. This just prepends the current working directory. | |||
907 | std::error_code EC = makeAbsolute(Path); | |||
908 | assert(!EC)((!EC) ? static_cast<void> (0) : __assert_fail ("!EC", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 908, __PRETTY_FUNCTION__)); | |||
909 | (void)EC; | |||
910 | ||||
911 | if (useNormalizedPaths()) | |||
912 | llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true); | |||
913 | ||||
914 | if (!Path.empty()) | |||
915 | WorkingDirectory = Path.str(); | |||
916 | return {}; | |||
917 | } | |||
918 | ||||
919 | std::error_code | |||
920 | InMemoryFileSystem::getRealPath(const Twine &Path, | |||
921 | SmallVectorImpl<char> &Output) const { | |||
922 | auto CWD = getCurrentWorkingDirectory(); | |||
923 | if (!CWD || CWD->empty()) | |||
924 | return errc::operation_not_permitted; | |||
925 | Path.toVector(Output); | |||
926 | if (auto EC = makeAbsolute(Output)) | |||
927 | return EC; | |||
928 | llvm::sys::path::remove_dots(Output, /*remove_dot_dot=*/true); | |||
929 | return {}; | |||
930 | } | |||
931 | ||||
932 | std::error_code InMemoryFileSystem::isLocal(const Twine &Path, bool &Result) { | |||
933 | Result = false; | |||
934 | return {}; | |||
935 | } | |||
936 | ||||
937 | } // namespace vfs | |||
938 | } // namespace llvm | |||
939 | ||||
940 | //===-----------------------------------------------------------------------===/ | |||
941 | // RedirectingFileSystem implementation | |||
942 | //===-----------------------------------------------------------------------===/ | |||
943 | ||||
944 | namespace { | |||
945 | ||||
946 | enum EntryKind { EK_Directory, EK_File }; | |||
947 | ||||
948 | /// A single file or directory in the VFS. | |||
949 | class Entry { | |||
950 | EntryKind Kind; | |||
951 | std::string Name; | |||
952 | ||||
953 | public: | |||
954 | Entry(EntryKind K, StringRef Name) : Kind(K), Name(Name) {} | |||
955 | virtual ~Entry() = default; | |||
956 | ||||
957 | StringRef getName() const { return Name; } | |||
958 | EntryKind getKind() const { return Kind; } | |||
959 | }; | |||
960 | ||||
961 | class RedirectingDirectoryEntry : public Entry { | |||
962 | std::vector<std::unique_ptr<Entry>> Contents; | |||
963 | Status S; | |||
964 | ||||
965 | public: | |||
966 | RedirectingDirectoryEntry(StringRef Name, | |||
967 | std::vector<std::unique_ptr<Entry>> Contents, | |||
968 | Status S) | |||
969 | : Entry(EK_Directory, Name), Contents(std::move(Contents)), | |||
970 | S(std::move(S)) {} | |||
971 | RedirectingDirectoryEntry(StringRef Name, Status S) | |||
972 | : Entry(EK_Directory, Name), S(std::move(S)) {} | |||
973 | ||||
974 | Status getStatus() { return S; } | |||
975 | ||||
976 | void addContent(std::unique_ptr<Entry> Content) { | |||
977 | Contents.push_back(std::move(Content)); | |||
978 | } | |||
979 | ||||
980 | Entry *getLastContent() const { return Contents.back().get(); } | |||
981 | ||||
982 | using iterator = decltype(Contents)::iterator; | |||
983 | ||||
984 | iterator contents_begin() { return Contents.begin(); } | |||
985 | iterator contents_end() { return Contents.end(); } | |||
986 | ||||
987 | static bool classof(const Entry *E) { return E->getKind() == EK_Directory; } | |||
988 | }; | |||
989 | ||||
990 | class RedirectingFileEntry : public Entry { | |||
991 | public: | |||
992 | enum NameKind { NK_NotSet, NK_External, NK_Virtual }; | |||
993 | ||||
994 | private: | |||
995 | std::string ExternalContentsPath; | |||
996 | NameKind UseName; | |||
997 | ||||
998 | public: | |||
999 | RedirectingFileEntry(StringRef Name, StringRef ExternalContentsPath, | |||
1000 | NameKind UseName) | |||
1001 | : Entry(EK_File, Name), ExternalContentsPath(ExternalContentsPath), | |||
1002 | UseName(UseName) {} | |||
1003 | ||||
1004 | StringRef getExternalContentsPath() const { return ExternalContentsPath; } | |||
1005 | ||||
1006 | /// whether to use the external path as the name for this file. | |||
1007 | bool useExternalName(bool GlobalUseExternalName) const { | |||
1008 | return UseName == NK_NotSet ? GlobalUseExternalName | |||
1009 | : (UseName == NK_External); | |||
1010 | } | |||
1011 | ||||
1012 | NameKind getUseName() const { return UseName; } | |||
1013 | ||||
1014 | static bool classof(const Entry *E) { return E->getKind() == EK_File; } | |||
1015 | }; | |||
1016 | ||||
1017 | // FIXME: reuse implementation common with OverlayFSDirIterImpl as these | |||
1018 | // iterators are conceptually similar. | |||
1019 | class VFSFromYamlDirIterImpl : public llvm::vfs::detail::DirIterImpl { | |||
1020 | std::string Dir; | |||
1021 | RedirectingDirectoryEntry::iterator Current, End; | |||
1022 | ||||
1023 | // To handle 'fallthrough' mode we need to iterate at first through | |||
1024 | // RedirectingDirectoryEntry and then through ExternalFS. These operations are | |||
1025 | // done sequentially, we just need to keep a track of what kind of iteration | |||
1026 | // we are currently performing. | |||
1027 | ||||
1028 | /// Flag telling if we should iterate through ExternalFS or stop at the last | |||
1029 | /// RedirectingDirectoryEntry::iterator. | |||
1030 | bool IterateExternalFS; | |||
1031 | /// Flag telling if we have switched to iterating through ExternalFS. | |||
1032 | bool IsExternalFSCurrent = false; | |||
1033 | FileSystem &ExternalFS; | |||
1034 | directory_iterator ExternalDirIter; | |||
1035 | llvm::StringSet<> SeenNames; | |||
1036 | ||||
1037 | /// To combine multiple iterations, different methods are responsible for | |||
1038 | /// different iteration steps. | |||
1039 | /// @{ | |||
1040 | ||||
1041 | /// Responsible for dispatching between RedirectingDirectoryEntry iteration | |||
1042 | /// and ExternalFS iteration. | |||
1043 | std::error_code incrementImpl(bool IsFirstTime); | |||
1044 | /// Responsible for RedirectingDirectoryEntry iteration. | |||
1045 | std::error_code incrementContent(bool IsFirstTime); | |||
1046 | /// Responsible for ExternalFS iteration. | |||
1047 | std::error_code incrementExternal(); | |||
1048 | /// @} | |||
1049 | ||||
1050 | public: | |||
1051 | VFSFromYamlDirIterImpl(const Twine &Path, | |||
1052 | RedirectingDirectoryEntry::iterator Begin, | |||
1053 | RedirectingDirectoryEntry::iterator End, | |||
1054 | bool IterateExternalFS, FileSystem &ExternalFS, | |||
1055 | std::error_code &EC); | |||
1056 | ||||
1057 | std::error_code increment() override; | |||
1058 | }; | |||
1059 | ||||
1060 | /// A virtual file system parsed from a YAML file. | |||
1061 | /// | |||
1062 | /// Currently, this class allows creating virtual directories and mapping | |||
1063 | /// virtual file paths to existing external files, available in \c ExternalFS. | |||
1064 | /// | |||
1065 | /// The basic structure of the parsed file is: | |||
1066 | /// \verbatim | |||
1067 | /// { | |||
1068 | /// 'version': <version number>, | |||
1069 | /// <optional configuration> | |||
1070 | /// 'roots': [ | |||
1071 | /// <directory entries> | |||
1072 | /// ] | |||
1073 | /// } | |||
1074 | /// \endverbatim | |||
1075 | /// | |||
1076 | /// All configuration options are optional. | |||
1077 | /// 'case-sensitive': <boolean, default=true> | |||
1078 | /// 'use-external-names': <boolean, default=true> | |||
1079 | /// 'overlay-relative': <boolean, default=false> | |||
1080 | /// 'fallthrough': <boolean, default=true> | |||
1081 | /// | |||
1082 | /// Virtual directories are represented as | |||
1083 | /// \verbatim | |||
1084 | /// { | |||
1085 | /// 'type': 'directory', | |||
1086 | /// 'name': <string>, | |||
1087 | /// 'contents': [ <file or directory entries> ] | |||
1088 | /// } | |||
1089 | /// \endverbatim | |||
1090 | /// | |||
1091 | /// The default attributes for virtual directories are: | |||
1092 | /// \verbatim | |||
1093 | /// MTime = now() when created | |||
1094 | /// Perms = 0777 | |||
1095 | /// User = Group = 0 | |||
1096 | /// Size = 0 | |||
1097 | /// UniqueID = unspecified unique value | |||
1098 | /// \endverbatim | |||
1099 | /// | |||
1100 | /// Re-mapped files are represented as | |||
1101 | /// \verbatim | |||
1102 | /// { | |||
1103 | /// 'type': 'file', | |||
1104 | /// 'name': <string>, | |||
1105 | /// 'use-external-name': <boolean> # Optional | |||
1106 | /// 'external-contents': <path to external file> | |||
1107 | /// } | |||
1108 | /// \endverbatim | |||
1109 | /// | |||
1110 | /// and inherit their attributes from the external contents. | |||
1111 | /// | |||
1112 | /// In both cases, the 'name' field may contain multiple path components (e.g. | |||
1113 | /// /path/to/file). However, any directory that contains more than one child | |||
1114 | /// must be uniquely represented by a directory entry. | |||
1115 | class RedirectingFileSystem : public vfs::FileSystem { | |||
1116 | friend class RedirectingFileSystemParser; | |||
1117 | ||||
1118 | /// The root(s) of the virtual file system. | |||
1119 | std::vector<std::unique_ptr<Entry>> Roots; | |||
1120 | ||||
1121 | /// The file system to use for external references. | |||
1122 | IntrusiveRefCntPtr<FileSystem> ExternalFS; | |||
1123 | ||||
1124 | /// If IsRelativeOverlay is set, this represents the directory | |||
1125 | /// path that should be prefixed to each 'external-contents' entry | |||
1126 | /// when reading from YAML files. | |||
1127 | std::string ExternalContentsPrefixDir; | |||
1128 | ||||
1129 | /// @name Configuration | |||
1130 | /// @{ | |||
1131 | ||||
1132 | /// Whether to perform case-sensitive comparisons. | |||
1133 | /// | |||
1134 | /// Currently, case-insensitive matching only works correctly with ASCII. | |||
1135 | bool CaseSensitive = true; | |||
1136 | ||||
1137 | /// IsRelativeOverlay marks whether a ExternalContentsPrefixDir path must | |||
1138 | /// be prefixed in every 'external-contents' when reading from YAML files. | |||
1139 | bool IsRelativeOverlay = false; | |||
1140 | ||||
1141 | /// Whether to use to use the value of 'external-contents' for the | |||
1142 | /// names of files. This global value is overridable on a per-file basis. | |||
1143 | bool UseExternalNames = true; | |||
1144 | ||||
1145 | /// Whether to attempt a file lookup in external file system after it wasn't | |||
1146 | /// found in VFS. | |||
1147 | bool IsFallthrough = true; | |||
1148 | /// @} | |||
1149 | ||||
1150 | /// Virtual file paths and external files could be canonicalized without "..", | |||
1151 | /// "." and "./" in their paths. FIXME: some unittests currently fail on | |||
1152 | /// win32 when using remove_dots and remove_leading_dotslash on paths. | |||
1153 | bool UseCanonicalizedPaths = | |||
1154 | #ifdef _WIN32 | |||
1155 | false; | |||
1156 | #else | |||
1157 | true; | |||
1158 | #endif | |||
1159 | ||||
1160 | private: | |||
1161 | RedirectingFileSystem(IntrusiveRefCntPtr<FileSystem> ExternalFS) | |||
1162 | : ExternalFS(std::move(ExternalFS)) {} | |||
1163 | ||||
1164 | /// Looks up the path <tt>[Start, End)</tt> in \p From, possibly | |||
1165 | /// recursing into the contents of \p From if it is a directory. | |||
1166 | ErrorOr<Entry *> lookupPath(sys::path::const_iterator Start, | |||
1167 | sys::path::const_iterator End, Entry *From) const; | |||
1168 | ||||
1169 | /// Get the status of a given an \c Entry. | |||
1170 | ErrorOr<Status> status(const Twine &Path, Entry *E); | |||
1171 | ||||
1172 | public: | |||
1173 | /// Looks up \p Path in \c Roots. | |||
1174 | ErrorOr<Entry *> lookupPath(const Twine &Path) const; | |||
1175 | ||||
1176 | /// Parses \p Buffer, which is expected to be in YAML format and | |||
1177 | /// returns a virtual file system representing its contents. | |||
1178 | static RedirectingFileSystem * | |||
1179 | create(std::unique_ptr<MemoryBuffer> Buffer, | |||
1180 | SourceMgr::DiagHandlerTy DiagHandler, StringRef YAMLFilePath, | |||
1181 | void *DiagContext, IntrusiveRefCntPtr<FileSystem> ExternalFS); | |||
1182 | ||||
1183 | ErrorOr<Status> status(const Twine &Path) override; | |||
1184 | ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override; | |||
1185 | ||||
1186 | std::error_code getRealPath(const Twine &Path, | |||
1187 | SmallVectorImpl<char> &Output) const override; | |||
1188 | ||||
1189 | llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override { | |||
1190 | return ExternalFS->getCurrentWorkingDirectory(); | |||
1191 | } | |||
1192 | ||||
1193 | std::error_code setCurrentWorkingDirectory(const Twine &Path) override { | |||
1194 | return ExternalFS->setCurrentWorkingDirectory(Path); | |||
1195 | } | |||
1196 | ||||
1197 | std::error_code isLocal(const Twine &Path, bool &Result) override { | |||
1198 | return ExternalFS->isLocal(Path, Result); | |||
1199 | } | |||
1200 | ||||
1201 | directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override { | |||
1202 | ErrorOr<Entry *> E = lookupPath(Dir); | |||
1203 | if (!E) { | |||
1204 | EC = E.getError(); | |||
1205 | if (IsFallthrough && EC == errc::no_such_file_or_directory) | |||
1206 | return ExternalFS->dir_begin(Dir, EC); | |||
1207 | return {}; | |||
1208 | } | |||
1209 | ErrorOr<Status> S = status(Dir, *E); | |||
1210 | if (!S) { | |||
1211 | EC = S.getError(); | |||
1212 | return {}; | |||
1213 | } | |||
1214 | if (!S->isDirectory()) { | |||
1215 | EC = std::error_code(static_cast<int>(errc::not_a_directory), | |||
1216 | std::system_category()); | |||
1217 | return {}; | |||
1218 | } | |||
1219 | ||||
1220 | auto *D = cast<RedirectingDirectoryEntry>(*E); | |||
1221 | return directory_iterator(std::make_shared<VFSFromYamlDirIterImpl>( | |||
1222 | Dir, D->contents_begin(), D->contents_end(), | |||
1223 | /*IterateExternalFS=*/IsFallthrough, *ExternalFS, EC)); | |||
1224 | } | |||
1225 | ||||
1226 | void setExternalContentsPrefixDir(StringRef PrefixDir) { | |||
1227 | ExternalContentsPrefixDir = PrefixDir.str(); | |||
1228 | } | |||
1229 | ||||
1230 | StringRef getExternalContentsPrefixDir() const { | |||
1231 | return ExternalContentsPrefixDir; | |||
1232 | } | |||
1233 | ||||
1234 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) | |||
1235 | LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void dump() const { | |||
1236 | for (const auto &Root : Roots) | |||
1237 | dumpEntry(Root.get()); | |||
1238 | } | |||
1239 | ||||
1240 | LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void dumpEntry(Entry *E, int NumSpaces = 0) const { | |||
1241 | StringRef Name = E->getName(); | |||
1242 | for (int i = 0, e = NumSpaces; i < e; ++i) | |||
1243 | dbgs() << " "; | |||
1244 | dbgs() << "'" << Name.str().c_str() << "'" | |||
1245 | << "\n"; | |||
1246 | ||||
1247 | if (E->getKind() == EK_Directory) { | |||
1248 | auto *DE = dyn_cast<RedirectingDirectoryEntry>(E); | |||
1249 | assert(DE && "Should be a directory")((DE && "Should be a directory") ? static_cast<void > (0) : __assert_fail ("DE && \"Should be a directory\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1249, __PRETTY_FUNCTION__)); | |||
1250 | ||||
1251 | for (std::unique_ptr<Entry> &SubEntry : | |||
1252 | llvm::make_range(DE->contents_begin(), DE->contents_end())) | |||
1253 | dumpEntry(SubEntry.get(), NumSpaces + 2); | |||
1254 | } | |||
1255 | } | |||
1256 | #endif | |||
1257 | }; | |||
1258 | ||||
1259 | /// A helper class to hold the common YAML parsing state. | |||
1260 | class RedirectingFileSystemParser { | |||
1261 | yaml::Stream &Stream; | |||
1262 | ||||
1263 | void error(yaml::Node *N, const Twine &Msg) { Stream.printError(N, Msg); } | |||
1264 | ||||
1265 | // false on error | |||
1266 | bool parseScalarString(yaml::Node *N, StringRef &Result, | |||
1267 | SmallVectorImpl<char> &Storage) { | |||
1268 | const auto *S = dyn_cast<yaml::ScalarNode>(N); | |||
1269 | ||||
1270 | if (!S) { | |||
1271 | error(N, "expected string"); | |||
1272 | return false; | |||
1273 | } | |||
1274 | Result = S->getValue(Storage); | |||
1275 | return true; | |||
1276 | } | |||
1277 | ||||
1278 | // false on error | |||
1279 | bool parseScalarBool(yaml::Node *N, bool &Result) { | |||
1280 | SmallString<5> Storage; | |||
1281 | StringRef Value; | |||
1282 | if (!parseScalarString(N, Value, Storage)) | |||
1283 | return false; | |||
1284 | ||||
1285 | if (Value.equals_lower("true") || Value.equals_lower("on") || | |||
1286 | Value.equals_lower("yes") || Value == "1") { | |||
1287 | Result = true; | |||
1288 | return true; | |||
1289 | } else if (Value.equals_lower("false") || Value.equals_lower("off") || | |||
1290 | Value.equals_lower("no") || Value == "0") { | |||
1291 | Result = false; | |||
1292 | return true; | |||
1293 | } | |||
1294 | ||||
1295 | error(N, "expected boolean value"); | |||
1296 | return false; | |||
1297 | } | |||
1298 | ||||
1299 | struct KeyStatus { | |||
1300 | bool Required; | |||
1301 | bool Seen = false; | |||
1302 | ||||
1303 | KeyStatus(bool Required = false) : Required(Required) {} | |||
1304 | }; | |||
1305 | ||||
1306 | using KeyStatusPair = std::pair<StringRef, KeyStatus>; | |||
1307 | ||||
1308 | // false on error | |||
1309 | bool checkDuplicateOrUnknownKey(yaml::Node *KeyNode, StringRef Key, | |||
1310 | DenseMap<StringRef, KeyStatus> &Keys) { | |||
1311 | if (!Keys.count(Key)) { | |||
1312 | error(KeyNode, "unknown key"); | |||
1313 | return false; | |||
1314 | } | |||
1315 | KeyStatus &S = Keys[Key]; | |||
1316 | if (S.Seen) { | |||
1317 | error(KeyNode, Twine("duplicate key '") + Key + "'"); | |||
1318 | return false; | |||
1319 | } | |||
1320 | S.Seen = true; | |||
1321 | return true; | |||
1322 | } | |||
1323 | ||||
1324 | // false on error | |||
1325 | bool checkMissingKeys(yaml::Node *Obj, DenseMap<StringRef, KeyStatus> &Keys) { | |||
1326 | for (const auto &I : Keys) { | |||
1327 | if (I.second.Required && !I.second.Seen) { | |||
1328 | error(Obj, Twine("missing key '") + I.first + "'"); | |||
1329 | return false; | |||
1330 | } | |||
1331 | } | |||
1332 | return true; | |||
1333 | } | |||
1334 | ||||
1335 | Entry *lookupOrCreateEntry(RedirectingFileSystem *FS, StringRef Name, | |||
1336 | Entry *ParentEntry = nullptr) { | |||
1337 | if (!ParentEntry) { // Look for a existent root | |||
1338 | for (const auto &Root : FS->Roots) { | |||
1339 | if (Name.equals(Root->getName())) { | |||
1340 | ParentEntry = Root.get(); | |||
1341 | return ParentEntry; | |||
1342 | } | |||
1343 | } | |||
1344 | } else { // Advance to the next component | |||
1345 | auto *DE = dyn_cast<RedirectingDirectoryEntry>(ParentEntry); | |||
1346 | for (std::unique_ptr<Entry> &Content : | |||
1347 | llvm::make_range(DE->contents_begin(), DE->contents_end())) { | |||
1348 | auto *DirContent = dyn_cast<RedirectingDirectoryEntry>(Content.get()); | |||
1349 | if (DirContent && Name.equals(Content->getName())) | |||
1350 | return DirContent; | |||
1351 | } | |||
1352 | } | |||
1353 | ||||
1354 | // ... or create a new one | |||
1355 | std::unique_ptr<Entry> E = llvm::make_unique<RedirectingDirectoryEntry>( | |||
1356 | Name, | |||
1357 | Status("", getNextVirtualUniqueID(), std::chrono::system_clock::now(), | |||
1358 | 0, 0, 0, file_type::directory_file, sys::fs::all_all)); | |||
1359 | ||||
1360 | if (!ParentEntry) { // Add a new root to the overlay | |||
1361 | FS->Roots.push_back(std::move(E)); | |||
1362 | ParentEntry = FS->Roots.back().get(); | |||
1363 | return ParentEntry; | |||
1364 | } | |||
1365 | ||||
1366 | auto *DE = dyn_cast<RedirectingDirectoryEntry>(ParentEntry); | |||
1367 | DE->addContent(std::move(E)); | |||
1368 | return DE->getLastContent(); | |||
1369 | } | |||
1370 | ||||
1371 | void uniqueOverlayTree(RedirectingFileSystem *FS, Entry *SrcE, | |||
1372 | Entry *NewParentE = nullptr) { | |||
1373 | StringRef Name = SrcE->getName(); | |||
1374 | switch (SrcE->getKind()) { | |||
1375 | case EK_Directory: { | |||
1376 | auto *DE = dyn_cast<RedirectingDirectoryEntry>(SrcE); | |||
1377 | assert(DE && "Must be a directory")((DE && "Must be a directory") ? static_cast<void> (0) : __assert_fail ("DE && \"Must be a directory\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1377, __PRETTY_FUNCTION__)); | |||
1378 | // Empty directories could be present in the YAML as a way to | |||
1379 | // describe a file for a current directory after some of its subdir | |||
1380 | // is parsed. This only leads to redundant walks, ignore it. | |||
1381 | if (!Name.empty()) | |||
1382 | NewParentE = lookupOrCreateEntry(FS, Name, NewParentE); | |||
1383 | for (std::unique_ptr<Entry> &SubEntry : | |||
1384 | llvm::make_range(DE->contents_begin(), DE->contents_end())) | |||
1385 | uniqueOverlayTree(FS, SubEntry.get(), NewParentE); | |||
1386 | break; | |||
1387 | } | |||
1388 | case EK_File: { | |||
1389 | auto *FE = dyn_cast<RedirectingFileEntry>(SrcE); | |||
1390 | assert(FE && "Must be a file")((FE && "Must be a file") ? static_cast<void> ( 0) : __assert_fail ("FE && \"Must be a file\"", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1390, __PRETTY_FUNCTION__)); | |||
1391 | assert(NewParentE && "Parent entry must exist")((NewParentE && "Parent entry must exist") ? static_cast <void> (0) : __assert_fail ("NewParentE && \"Parent entry must exist\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1391, __PRETTY_FUNCTION__)); | |||
1392 | auto *DE = dyn_cast<RedirectingDirectoryEntry>(NewParentE); | |||
1393 | DE->addContent(llvm::make_unique<RedirectingFileEntry>( | |||
1394 | Name, FE->getExternalContentsPath(), FE->getUseName())); | |||
1395 | break; | |||
1396 | } | |||
1397 | } | |||
1398 | } | |||
1399 | ||||
1400 | std::unique_ptr<Entry> parseEntry(yaml::Node *N, RedirectingFileSystem *FS, | |||
1401 | bool IsRootEntry) { | |||
1402 | auto *M = dyn_cast<yaml::MappingNode>(N); | |||
1403 | if (!M) { | |||
1404 | error(N, "expected mapping node for file or directory entry"); | |||
1405 | return nullptr; | |||
1406 | } | |||
1407 | ||||
1408 | KeyStatusPair Fields[] = { | |||
1409 | KeyStatusPair("name", true), | |||
1410 | KeyStatusPair("type", true), | |||
1411 | KeyStatusPair("contents", false), | |||
1412 | KeyStatusPair("external-contents", false), | |||
1413 | KeyStatusPair("use-external-name", false), | |||
1414 | }; | |||
1415 | ||||
1416 | DenseMap<StringRef, KeyStatus> Keys(std::begin(Fields), std::end(Fields)); | |||
1417 | ||||
1418 | bool HasContents = false; // external or otherwise | |||
1419 | std::vector<std::unique_ptr<Entry>> EntryArrayContents; | |||
1420 | std::string ExternalContentsPath; | |||
1421 | std::string Name; | |||
1422 | yaml::Node *NameValueNode; | |||
1423 | auto UseExternalName = RedirectingFileEntry::NK_NotSet; | |||
1424 | EntryKind Kind; | |||
1425 | ||||
1426 | for (auto &I : *M) { | |||
1427 | StringRef Key; | |||
1428 | // Reuse the buffer for key and value, since we don't look at key after | |||
1429 | // parsing value. | |||
1430 | SmallString<256> Buffer; | |||
1431 | if (!parseScalarString(I.getKey(), Key, Buffer)) | |||
1432 | return nullptr; | |||
1433 | ||||
1434 | if (!checkDuplicateOrUnknownKey(I.getKey(), Key, Keys)) | |||
1435 | return nullptr; | |||
1436 | ||||
1437 | StringRef Value; | |||
1438 | if (Key == "name") { | |||
1439 | if (!parseScalarString(I.getValue(), Value, Buffer)) | |||
1440 | return nullptr; | |||
1441 | ||||
1442 | NameValueNode = I.getValue(); | |||
1443 | if (FS->UseCanonicalizedPaths) { | |||
1444 | SmallString<256> Path(Value); | |||
1445 | // Guarantee that old YAML files containing paths with ".." and "." | |||
1446 | // are properly canonicalized before read into the VFS. | |||
1447 | Path = sys::path::remove_leading_dotslash(Path); | |||
1448 | sys::path::remove_dots(Path, /*remove_dot_dot=*/true); | |||
1449 | Name = Path.str(); | |||
1450 | } else { | |||
1451 | Name = Value; | |||
1452 | } | |||
1453 | } else if (Key == "type") { | |||
1454 | if (!parseScalarString(I.getValue(), Value, Buffer)) | |||
1455 | return nullptr; | |||
1456 | if (Value == "file") | |||
1457 | Kind = EK_File; | |||
1458 | else if (Value == "directory") | |||
1459 | Kind = EK_Directory; | |||
1460 | else { | |||
1461 | error(I.getValue(), "unknown value for 'type'"); | |||
1462 | return nullptr; | |||
1463 | } | |||
1464 | } else if (Key == "contents") { | |||
1465 | if (HasContents) { | |||
1466 | error(I.getKey(), | |||
1467 | "entry already has 'contents' or 'external-contents'"); | |||
1468 | return nullptr; | |||
1469 | } | |||
1470 | HasContents = true; | |||
1471 | auto *Contents = dyn_cast<yaml::SequenceNode>(I.getValue()); | |||
1472 | if (!Contents) { | |||
1473 | // FIXME: this is only for directories, what about files? | |||
1474 | error(I.getValue(), "expected array"); | |||
1475 | return nullptr; | |||
1476 | } | |||
1477 | ||||
1478 | for (auto &I : *Contents) { | |||
1479 | if (std::unique_ptr<Entry> E = | |||
1480 | parseEntry(&I, FS, /*IsRootEntry*/ false)) | |||
1481 | EntryArrayContents.push_back(std::move(E)); | |||
1482 | else | |||
1483 | return nullptr; | |||
1484 | } | |||
1485 | } else if (Key == "external-contents") { | |||
1486 | if (HasContents) { | |||
1487 | error(I.getKey(), | |||
1488 | "entry already has 'contents' or 'external-contents'"); | |||
1489 | return nullptr; | |||
1490 | } | |||
1491 | HasContents = true; | |||
1492 | if (!parseScalarString(I.getValue(), Value, Buffer)) | |||
1493 | return nullptr; | |||
1494 | ||||
1495 | SmallString<256> FullPath; | |||
1496 | if (FS->IsRelativeOverlay) { | |||
1497 | FullPath = FS->getExternalContentsPrefixDir(); | |||
1498 | assert(!FullPath.empty() &&((!FullPath.empty() && "External contents prefix directory must exist" ) ? static_cast<void> (0) : __assert_fail ("!FullPath.empty() && \"External contents prefix directory must exist\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1499, __PRETTY_FUNCTION__)) | |||
1499 | "External contents prefix directory must exist")((!FullPath.empty() && "External contents prefix directory must exist" ) ? static_cast<void> (0) : __assert_fail ("!FullPath.empty() && \"External contents prefix directory must exist\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1499, __PRETTY_FUNCTION__)); | |||
1500 | llvm::sys::path::append(FullPath, Value); | |||
1501 | } else { | |||
1502 | FullPath = Value; | |||
1503 | } | |||
1504 | ||||
1505 | if (FS->UseCanonicalizedPaths) { | |||
1506 | // Guarantee that old YAML files containing paths with ".." and "." | |||
1507 | // are properly canonicalized before read into the VFS. | |||
1508 | FullPath = sys::path::remove_leading_dotslash(FullPath); | |||
1509 | sys::path::remove_dots(FullPath, /*remove_dot_dot=*/true); | |||
1510 | } | |||
1511 | ExternalContentsPath = FullPath.str(); | |||
1512 | } else if (Key == "use-external-name") { | |||
1513 | bool Val; | |||
1514 | if (!parseScalarBool(I.getValue(), Val)) | |||
1515 | return nullptr; | |||
1516 | UseExternalName = Val ? RedirectingFileEntry::NK_External | |||
1517 | : RedirectingFileEntry::NK_Virtual; | |||
1518 | } else { | |||
1519 | llvm_unreachable("key missing from Keys")::llvm::llvm_unreachable_internal("key missing from Keys", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1519); | |||
1520 | } | |||
1521 | } | |||
1522 | ||||
1523 | if (Stream.failed()) | |||
1524 | return nullptr; | |||
1525 | ||||
1526 | // check for missing keys | |||
1527 | if (!HasContents) { | |||
1528 | error(N, "missing key 'contents' or 'external-contents'"); | |||
1529 | return nullptr; | |||
1530 | } | |||
1531 | if (!checkMissingKeys(N, Keys)) | |||
1532 | return nullptr; | |||
1533 | ||||
1534 | // check invalid configuration | |||
1535 | if (Kind == EK_Directory && | |||
| ||||
1536 | UseExternalName != RedirectingFileEntry::NK_NotSet) { | |||
1537 | error(N, "'use-external-name' is not supported for directories"); | |||
1538 | return nullptr; | |||
1539 | } | |||
1540 | ||||
1541 | if (IsRootEntry && !sys::path::is_absolute(Name)) { | |||
1542 | assert(NameValueNode && "Name presence should be checked earlier")((NameValueNode && "Name presence should be checked earlier" ) ? static_cast<void> (0) : __assert_fail ("NameValueNode && \"Name presence should be checked earlier\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1542, __PRETTY_FUNCTION__)); | |||
1543 | error(NameValueNode, | |||
1544 | "entry with relative path at the root level is not discoverable"); | |||
1545 | return nullptr; | |||
1546 | } | |||
1547 | ||||
1548 | // Remove trailing slash(es), being careful not to remove the root path | |||
1549 | StringRef Trimmed(Name); | |||
1550 | size_t RootPathLen = sys::path::root_path(Trimmed).size(); | |||
1551 | while (Trimmed.size() > RootPathLen && | |||
1552 | sys::path::is_separator(Trimmed.back())) | |||
1553 | Trimmed = Trimmed.slice(0, Trimmed.size() - 1); | |||
1554 | // Get the last component | |||
1555 | StringRef LastComponent = sys::path::filename(Trimmed); | |||
1556 | ||||
1557 | std::unique_ptr<Entry> Result; | |||
1558 | switch (Kind) { | |||
1559 | case EK_File: | |||
1560 | Result = llvm::make_unique<RedirectingFileEntry>( | |||
1561 | LastComponent, std::move(ExternalContentsPath), UseExternalName); | |||
1562 | break; | |||
1563 | case EK_Directory: | |||
1564 | Result = llvm::make_unique<RedirectingDirectoryEntry>( | |||
1565 | LastComponent, std::move(EntryArrayContents), | |||
1566 | Status("", getNextVirtualUniqueID(), std::chrono::system_clock::now(), | |||
1567 | 0, 0, 0, file_type::directory_file, sys::fs::all_all)); | |||
1568 | break; | |||
1569 | } | |||
1570 | ||||
1571 | StringRef Parent = sys::path::parent_path(Trimmed); | |||
1572 | if (Parent.empty()) | |||
1573 | return Result; | |||
1574 | ||||
1575 | // if 'name' contains multiple components, create implicit directory entries | |||
1576 | for (sys::path::reverse_iterator I = sys::path::rbegin(Parent), | |||
1577 | E = sys::path::rend(Parent); | |||
1578 | I != E; ++I) { | |||
1579 | std::vector<std::unique_ptr<Entry>> Entries; | |||
1580 | Entries.push_back(std::move(Result)); | |||
1581 | Result = llvm::make_unique<RedirectingDirectoryEntry>( | |||
1582 | *I, std::move(Entries), | |||
1583 | Status("", getNextVirtualUniqueID(), std::chrono::system_clock::now(), | |||
1584 | 0, 0, 0, file_type::directory_file, sys::fs::all_all)); | |||
1585 | } | |||
1586 | return Result; | |||
1587 | } | |||
1588 | ||||
1589 | public: | |||
1590 | RedirectingFileSystemParser(yaml::Stream &S) : Stream(S) {} | |||
1591 | ||||
1592 | // false on error | |||
1593 | bool parse(yaml::Node *Root, RedirectingFileSystem *FS) { | |||
1594 | auto *Top = dyn_cast<yaml::MappingNode>(Root); | |||
1595 | if (!Top) { | |||
1596 | error(Root, "expected mapping node"); | |||
1597 | return false; | |||
1598 | } | |||
1599 | ||||
1600 | KeyStatusPair Fields[] = { | |||
1601 | KeyStatusPair("version", true), | |||
1602 | KeyStatusPair("case-sensitive", false), | |||
1603 | KeyStatusPair("use-external-names", false), | |||
1604 | KeyStatusPair("overlay-relative", false), | |||
1605 | KeyStatusPair("fallthrough", false), | |||
1606 | KeyStatusPair("roots", true), | |||
1607 | }; | |||
1608 | ||||
1609 | DenseMap<StringRef, KeyStatus> Keys(std::begin(Fields), std::end(Fields)); | |||
1610 | std::vector<std::unique_ptr<Entry>> RootEntries; | |||
1611 | ||||
1612 | // Parse configuration and 'roots' | |||
1613 | for (auto &I : *Top) { | |||
1614 | SmallString<10> KeyBuffer; | |||
1615 | StringRef Key; | |||
1616 | if (!parseScalarString(I.getKey(), Key, KeyBuffer)) | |||
1617 | return false; | |||
1618 | ||||
1619 | if (!checkDuplicateOrUnknownKey(I.getKey(), Key, Keys)) | |||
1620 | return false; | |||
1621 | ||||
1622 | if (Key == "roots") { | |||
1623 | auto *Roots = dyn_cast<yaml::SequenceNode>(I.getValue()); | |||
1624 | if (!Roots) { | |||
1625 | error(I.getValue(), "expected array"); | |||
1626 | return false; | |||
1627 | } | |||
1628 | ||||
1629 | for (auto &I : *Roots) { | |||
1630 | if (std::unique_ptr<Entry> E = | |||
1631 | parseEntry(&I, FS, /*IsRootEntry*/ true)) | |||
1632 | RootEntries.push_back(std::move(E)); | |||
1633 | else | |||
1634 | return false; | |||
1635 | } | |||
1636 | } else if (Key == "version") { | |||
1637 | StringRef VersionString; | |||
1638 | SmallString<4> Storage; | |||
1639 | if (!parseScalarString(I.getValue(), VersionString, Storage)) | |||
1640 | return false; | |||
1641 | int Version; | |||
1642 | if (VersionString.getAsInteger<int>(10, Version)) { | |||
1643 | error(I.getValue(), "expected integer"); | |||
1644 | return false; | |||
1645 | } | |||
1646 | if (Version < 0) { | |||
1647 | error(I.getValue(), "invalid version number"); | |||
1648 | return false; | |||
1649 | } | |||
1650 | if (Version != 0) { | |||
1651 | error(I.getValue(), "version mismatch, expected 0"); | |||
1652 | return false; | |||
1653 | } | |||
1654 | } else if (Key == "case-sensitive") { | |||
1655 | if (!parseScalarBool(I.getValue(), FS->CaseSensitive)) | |||
1656 | return false; | |||
1657 | } else if (Key == "overlay-relative") { | |||
1658 | if (!parseScalarBool(I.getValue(), FS->IsRelativeOverlay)) | |||
1659 | return false; | |||
1660 | } else if (Key == "use-external-names") { | |||
1661 | if (!parseScalarBool(I.getValue(), FS->UseExternalNames)) | |||
1662 | return false; | |||
1663 | } else if (Key == "fallthrough") { | |||
1664 | if (!parseScalarBool(I.getValue(), FS->IsFallthrough)) | |||
1665 | return false; | |||
1666 | } else { | |||
1667 | llvm_unreachable("key missing from Keys")::llvm::llvm_unreachable_internal("key missing from Keys", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1667); | |||
1668 | } | |||
1669 | } | |||
1670 | ||||
1671 | if (Stream.failed()) | |||
1672 | return false; | |||
1673 | ||||
1674 | if (!checkMissingKeys(Top, Keys)) | |||
1675 | return false; | |||
1676 | ||||
1677 | // Now that we sucessefully parsed the YAML file, canonicalize the internal | |||
1678 | // representation to a proper directory tree so that we can search faster | |||
1679 | // inside the VFS. | |||
1680 | for (auto &E : RootEntries) | |||
1681 | uniqueOverlayTree(FS, E.get()); | |||
1682 | ||||
1683 | return true; | |||
1684 | } | |||
1685 | }; | |||
1686 | ||||
1687 | } // namespace | |||
1688 | ||||
1689 | RedirectingFileSystem * | |||
1690 | RedirectingFileSystem::create(std::unique_ptr<MemoryBuffer> Buffer, | |||
1691 | SourceMgr::DiagHandlerTy DiagHandler, | |||
1692 | StringRef YAMLFilePath, void *DiagContext, | |||
1693 | IntrusiveRefCntPtr<FileSystem> ExternalFS) { | |||
1694 | SourceMgr SM; | |||
1695 | yaml::Stream Stream(Buffer->getMemBufferRef(), SM); | |||
1696 | ||||
1697 | SM.setDiagHandler(DiagHandler, DiagContext); | |||
1698 | yaml::document_iterator DI = Stream.begin(); | |||
1699 | yaml::Node *Root = DI->getRoot(); | |||
1700 | if (DI == Stream.end() || !Root) { | |||
1701 | SM.PrintMessage(SMLoc(), SourceMgr::DK_Error, "expected root node"); | |||
1702 | return nullptr; | |||
1703 | } | |||
1704 | ||||
1705 | RedirectingFileSystemParser P(Stream); | |||
1706 | ||||
1707 | std::unique_ptr<RedirectingFileSystem> FS( | |||
1708 | new RedirectingFileSystem(std::move(ExternalFS))); | |||
1709 | ||||
1710 | if (!YAMLFilePath.empty()) { | |||
1711 | // Use the YAML path from -ivfsoverlay to compute the dir to be prefixed | |||
1712 | // to each 'external-contents' path. | |||
1713 | // | |||
1714 | // Example: | |||
1715 | // -ivfsoverlay dummy.cache/vfs/vfs.yaml | |||
1716 | // yields: | |||
1717 | // FS->ExternalContentsPrefixDir => /<absolute_path_to>/dummy.cache/vfs | |||
1718 | // | |||
1719 | SmallString<256> OverlayAbsDir = sys::path::parent_path(YAMLFilePath); | |||
1720 | std::error_code EC = llvm::sys::fs::make_absolute(OverlayAbsDir); | |||
1721 | assert(!EC && "Overlay dir final path must be absolute")((!EC && "Overlay dir final path must be absolute") ? static_cast<void> (0) : __assert_fail ("!EC && \"Overlay dir final path must be absolute\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1721, __PRETTY_FUNCTION__)); | |||
1722 | (void)EC; | |||
1723 | FS->setExternalContentsPrefixDir(OverlayAbsDir); | |||
1724 | } | |||
1725 | ||||
1726 | if (!P.parse(Root, FS.get())) | |||
1727 | return nullptr; | |||
1728 | ||||
1729 | return FS.release(); | |||
1730 | } | |||
1731 | ||||
1732 | ErrorOr<Entry *> RedirectingFileSystem::lookupPath(const Twine &Path_) const { | |||
1733 | SmallString<256> Path; | |||
1734 | Path_.toVector(Path); | |||
1735 | ||||
1736 | // Handle relative paths | |||
1737 | if (std::error_code EC = makeAbsolute(Path)) | |||
1738 | return EC; | |||
1739 | ||||
1740 | // Canonicalize path by removing ".", "..", "./", etc components. This is | |||
1741 | // a VFS request, do bot bother about symlinks in the path components | |||
1742 | // but canonicalize in order to perform the correct entry search. | |||
1743 | if (UseCanonicalizedPaths) { | |||
1744 | Path = sys::path::remove_leading_dotslash(Path); | |||
1745 | sys::path::remove_dots(Path, /*remove_dot_dot=*/true); | |||
1746 | } | |||
1747 | ||||
1748 | if (Path.empty()) | |||
1749 | return make_error_code(llvm::errc::invalid_argument); | |||
1750 | ||||
1751 | sys::path::const_iterator Start = sys::path::begin(Path); | |||
1752 | sys::path::const_iterator End = sys::path::end(Path); | |||
1753 | for (const auto &Root : Roots) { | |||
1754 | ErrorOr<Entry *> Result = lookupPath(Start, End, Root.get()); | |||
1755 | if (Result || Result.getError() != llvm::errc::no_such_file_or_directory) | |||
1756 | return Result; | |||
1757 | } | |||
1758 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
1759 | } | |||
1760 | ||||
1761 | ErrorOr<Entry *> | |||
1762 | RedirectingFileSystem::lookupPath(sys::path::const_iterator Start, | |||
1763 | sys::path::const_iterator End, | |||
1764 | Entry *From) const { | |||
1765 | #ifndef _WIN32 | |||
1766 | assert(!isTraversalComponent(*Start) &&((!isTraversalComponent(*Start) && !isTraversalComponent (From->getName()) && "Paths should not contain traversal components" ) ? static_cast<void> (0) : __assert_fail ("!isTraversalComponent(*Start) && !isTraversalComponent(From->getName()) && \"Paths should not contain traversal components\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1768, __PRETTY_FUNCTION__)) | |||
1767 | !isTraversalComponent(From->getName()) &&((!isTraversalComponent(*Start) && !isTraversalComponent (From->getName()) && "Paths should not contain traversal components" ) ? static_cast<void> (0) : __assert_fail ("!isTraversalComponent(*Start) && !isTraversalComponent(From->getName()) && \"Paths should not contain traversal components\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1768, __PRETTY_FUNCTION__)) | |||
1768 | "Paths should not contain traversal components")((!isTraversalComponent(*Start) && !isTraversalComponent (From->getName()) && "Paths should not contain traversal components" ) ? static_cast<void> (0) : __assert_fail ("!isTraversalComponent(*Start) && !isTraversalComponent(From->getName()) && \"Paths should not contain traversal components\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1768, __PRETTY_FUNCTION__)); | |||
1769 | #else | |||
1770 | // FIXME: this is here to support windows, remove it once canonicalized | |||
1771 | // paths become globally default. | |||
1772 | if (Start->equals(".")) | |||
1773 | ++Start; | |||
1774 | #endif | |||
1775 | ||||
1776 | StringRef FromName = From->getName(); | |||
1777 | ||||
1778 | // Forward the search to the next component in case this is an empty one. | |||
1779 | if (!FromName.empty()) { | |||
1780 | if (CaseSensitive ? !Start->equals(FromName) | |||
1781 | : !Start->equals_lower(FromName)) | |||
1782 | // failure to match | |||
1783 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
1784 | ||||
1785 | ++Start; | |||
1786 | ||||
1787 | if (Start == End) { | |||
1788 | // Match! | |||
1789 | return From; | |||
1790 | } | |||
1791 | } | |||
1792 | ||||
1793 | auto *DE = dyn_cast<RedirectingDirectoryEntry>(From); | |||
1794 | if (!DE) | |||
1795 | return make_error_code(llvm::errc::not_a_directory); | |||
1796 | ||||
1797 | for (const std::unique_ptr<Entry> &DirEntry : | |||
1798 | llvm::make_range(DE->contents_begin(), DE->contents_end())) { | |||
1799 | ErrorOr<Entry *> Result = lookupPath(Start, End, DirEntry.get()); | |||
1800 | if (Result || Result.getError() != llvm::errc::no_such_file_or_directory) | |||
1801 | return Result; | |||
1802 | } | |||
1803 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
1804 | } | |||
1805 | ||||
1806 | static Status getRedirectedFileStatus(const Twine &Path, bool UseExternalNames, | |||
1807 | Status ExternalStatus) { | |||
1808 | Status S = ExternalStatus; | |||
1809 | if (!UseExternalNames) | |||
1810 | S = Status::copyWithNewName(S, Path.str()); | |||
1811 | S.IsVFSMapped = true; | |||
1812 | return S; | |||
1813 | } | |||
1814 | ||||
1815 | ErrorOr<Status> RedirectingFileSystem::status(const Twine &Path, Entry *E) { | |||
1816 | assert(E != nullptr)((E != nullptr) ? static_cast<void> (0) : __assert_fail ("E != nullptr", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1816, __PRETTY_FUNCTION__)); | |||
1817 | if (auto *F = dyn_cast<RedirectingFileEntry>(E)) { | |||
1818 | ErrorOr<Status> S = ExternalFS->status(F->getExternalContentsPath()); | |||
1819 | assert(!S || S->getName() == F->getExternalContentsPath())((!S || S->getName() == F->getExternalContentsPath()) ? static_cast<void> (0) : __assert_fail ("!S || S->getName() == F->getExternalContentsPath()" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1819, __PRETTY_FUNCTION__)); | |||
1820 | if (S) | |||
1821 | return getRedirectedFileStatus(Path, F->useExternalName(UseExternalNames), | |||
1822 | *S); | |||
1823 | return S; | |||
1824 | } else { // directory | |||
1825 | auto *DE = cast<RedirectingDirectoryEntry>(E); | |||
1826 | return Status::copyWithNewName(DE->getStatus(), Path.str()); | |||
1827 | } | |||
1828 | } | |||
1829 | ||||
1830 | ErrorOr<Status> RedirectingFileSystem::status(const Twine &Path) { | |||
1831 | ErrorOr<Entry *> Result = lookupPath(Path); | |||
1832 | if (!Result) { | |||
1833 | if (IsFallthrough && | |||
1834 | Result.getError() == llvm::errc::no_such_file_or_directory) { | |||
1835 | return ExternalFS->status(Path); | |||
1836 | } | |||
1837 | return Result.getError(); | |||
1838 | } | |||
1839 | return status(Path, *Result); | |||
1840 | } | |||
1841 | ||||
1842 | namespace { | |||
1843 | ||||
1844 | /// Provide a file wrapper with an overriden status. | |||
1845 | class FileWithFixedStatus : public File { | |||
1846 | std::unique_ptr<File> InnerFile; | |||
1847 | Status S; | |||
1848 | ||||
1849 | public: | |||
1850 | FileWithFixedStatus(std::unique_ptr<File> InnerFile, Status S) | |||
1851 | : InnerFile(std::move(InnerFile)), S(std::move(S)) {} | |||
1852 | ||||
1853 | ErrorOr<Status> status() override { return S; } | |||
1854 | ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> | |||
1855 | ||||
1856 | getBuffer(const Twine &Name, int64_t FileSize, bool RequiresNullTerminator, | |||
1857 | bool IsVolatile) override { | |||
1858 | return InnerFile->getBuffer(Name, FileSize, RequiresNullTerminator, | |||
1859 | IsVolatile); | |||
1860 | } | |||
1861 | ||||
1862 | std::error_code close() override { return InnerFile->close(); } | |||
1863 | }; | |||
1864 | ||||
1865 | } // namespace | |||
1866 | ||||
1867 | ErrorOr<std::unique_ptr<File>> | |||
1868 | RedirectingFileSystem::openFileForRead(const Twine &Path) { | |||
1869 | ErrorOr<Entry *> E = lookupPath(Path); | |||
1870 | if (!E) { | |||
1871 | if (IsFallthrough && | |||
1872 | E.getError() == llvm::errc::no_such_file_or_directory) { | |||
1873 | return ExternalFS->openFileForRead(Path); | |||
1874 | } | |||
1875 | return E.getError(); | |||
1876 | } | |||
1877 | ||||
1878 | auto *F = dyn_cast<RedirectingFileEntry>(*E); | |||
1879 | if (!F) // FIXME: errc::not_a_file? | |||
1880 | return make_error_code(llvm::errc::invalid_argument); | |||
1881 | ||||
1882 | auto Result = ExternalFS->openFileForRead(F->getExternalContentsPath()); | |||
1883 | if (!Result) | |||
1884 | return Result; | |||
1885 | ||||
1886 | auto ExternalStatus = (*Result)->status(); | |||
1887 | if (!ExternalStatus) | |||
1888 | return ExternalStatus.getError(); | |||
1889 | ||||
1890 | // FIXME: Update the status with the name and VFSMapped. | |||
1891 | Status S = getRedirectedFileStatus(Path, F->useExternalName(UseExternalNames), | |||
1892 | *ExternalStatus); | |||
1893 | return std::unique_ptr<File>( | |||
1894 | llvm::make_unique<FileWithFixedStatus>(std::move(*Result), S)); | |||
1895 | } | |||
1896 | ||||
1897 | std::error_code | |||
1898 | RedirectingFileSystem::getRealPath(const Twine &Path, | |||
1899 | SmallVectorImpl<char> &Output) const { | |||
1900 | ErrorOr<Entry *> Result = lookupPath(Path); | |||
1901 | if (!Result) { | |||
1902 | if (IsFallthrough && | |||
1903 | Result.getError() == llvm::errc::no_such_file_or_directory) { | |||
1904 | return ExternalFS->getRealPath(Path, Output); | |||
1905 | } | |||
1906 | return Result.getError(); | |||
1907 | } | |||
1908 | ||||
1909 | if (auto *F = dyn_cast<RedirectingFileEntry>(*Result)) { | |||
1910 | return ExternalFS->getRealPath(F->getExternalContentsPath(), Output); | |||
1911 | } | |||
1912 | // Even if there is a directory entry, fall back to ExternalFS if allowed, | |||
1913 | // because directories don't have a single external contents path. | |||
1914 | return IsFallthrough ? ExternalFS->getRealPath(Path, Output) | |||
1915 | : llvm::errc::invalid_argument; | |||
1916 | } | |||
1917 | ||||
1918 | IntrusiveRefCntPtr<FileSystem> | |||
1919 | vfs::getVFSFromYAML(std::unique_ptr<MemoryBuffer> Buffer, | |||
1920 | SourceMgr::DiagHandlerTy DiagHandler, | |||
1921 | StringRef YAMLFilePath, void *DiagContext, | |||
1922 | IntrusiveRefCntPtr<FileSystem> ExternalFS) { | |||
1923 | return RedirectingFileSystem::create(std::move(Buffer), DiagHandler, | |||
1924 | YAMLFilePath, DiagContext, | |||
1925 | std::move(ExternalFS)); | |||
1926 | } | |||
1927 | ||||
1928 | static void getVFSEntries(Entry *SrcE, SmallVectorImpl<StringRef> &Path, | |||
1929 | SmallVectorImpl<YAMLVFSEntry> &Entries) { | |||
1930 | auto Kind = SrcE->getKind(); | |||
1931 | if (Kind == EK_Directory) { | |||
1932 | auto *DE = dyn_cast<RedirectingDirectoryEntry>(SrcE); | |||
1933 | assert(DE && "Must be a directory")((DE && "Must be a directory") ? static_cast<void> (0) : __assert_fail ("DE && \"Must be a directory\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1933, __PRETTY_FUNCTION__)); | |||
1934 | for (std::unique_ptr<Entry> &SubEntry : | |||
1935 | llvm::make_range(DE->contents_begin(), DE->contents_end())) { | |||
1936 | Path.push_back(SubEntry->getName()); | |||
1937 | getVFSEntries(SubEntry.get(), Path, Entries); | |||
1938 | Path.pop_back(); | |||
1939 | } | |||
1940 | return; | |||
1941 | } | |||
1942 | ||||
1943 | assert(Kind == EK_File && "Must be a EK_File")((Kind == EK_File && "Must be a EK_File") ? static_cast <void> (0) : __assert_fail ("Kind == EK_File && \"Must be a EK_File\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1943, __PRETTY_FUNCTION__)); | |||
1944 | auto *FE = dyn_cast<RedirectingFileEntry>(SrcE); | |||
1945 | assert(FE && "Must be a file")((FE && "Must be a file") ? static_cast<void> ( 0) : __assert_fail ("FE && \"Must be a file\"", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1945, __PRETTY_FUNCTION__)); | |||
1946 | SmallString<128> VPath; | |||
1947 | for (auto &Comp : Path) | |||
1948 | llvm::sys::path::append(VPath, Comp); | |||
1949 | Entries.push_back(YAMLVFSEntry(VPath.c_str(), FE->getExternalContentsPath())); | |||
1950 | } | |||
1951 | ||||
1952 | void vfs::collectVFSFromYAML(std::unique_ptr<MemoryBuffer> Buffer, | |||
1953 | SourceMgr::DiagHandlerTy DiagHandler, | |||
1954 | StringRef YAMLFilePath, | |||
1955 | SmallVectorImpl<YAMLVFSEntry> &CollectedEntries, | |||
1956 | void *DiagContext, | |||
1957 | IntrusiveRefCntPtr<FileSystem> ExternalFS) { | |||
1958 | RedirectingFileSystem *VFS = RedirectingFileSystem::create( | |||
| ||||
1959 | std::move(Buffer), DiagHandler, YAMLFilePath, DiagContext, | |||
1960 | std::move(ExternalFS)); | |||
1961 | ErrorOr<Entry *> RootE = VFS->lookupPath("/"); | |||
1962 | if (!RootE) | |||
1963 | return; | |||
1964 | SmallVector<StringRef, 8> Components; | |||
1965 | Components.push_back("/"); | |||
1966 | getVFSEntries(*RootE, Components, CollectedEntries); | |||
1967 | } | |||
1968 | ||||
1969 | UniqueID vfs::getNextVirtualUniqueID() { | |||
1970 | static std::atomic<unsigned> UID; | |||
1971 | unsigned ID = ++UID; | |||
1972 | // The following assumes that uint64_t max will never collide with a real | |||
1973 | // dev_t value from the OS. | |||
1974 | return UniqueID(std::numeric_limits<uint64_t>::max(), ID); | |||
1975 | } | |||
1976 | ||||
1977 | void YAMLVFSWriter::addFileMapping(StringRef VirtualPath, StringRef RealPath) { | |||
1978 | assert(sys::path::is_absolute(VirtualPath) && "virtual path not absolute")((sys::path::is_absolute(VirtualPath) && "virtual path not absolute" ) ? static_cast<void> (0) : __assert_fail ("sys::path::is_absolute(VirtualPath) && \"virtual path not absolute\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1978, __PRETTY_FUNCTION__)); | |||
1979 | assert(sys::path::is_absolute(RealPath) && "real path not absolute")((sys::path::is_absolute(RealPath) && "real path not absolute" ) ? static_cast<void> (0) : __assert_fail ("sys::path::is_absolute(RealPath) && \"real path not absolute\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1979, __PRETTY_FUNCTION__)); | |||
1980 | assert(!pathHasTraversal(VirtualPath) && "path traversal is not supported")((!pathHasTraversal(VirtualPath) && "path traversal is not supported" ) ? static_cast<void> (0) : __assert_fail ("!pathHasTraversal(VirtualPath) && \"path traversal is not supported\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 1980, __PRETTY_FUNCTION__)); | |||
1981 | Mappings.emplace_back(VirtualPath, RealPath); | |||
1982 | } | |||
1983 | ||||
1984 | namespace { | |||
1985 | ||||
1986 | class JSONWriter { | |||
1987 | llvm::raw_ostream &OS; | |||
1988 | SmallVector<StringRef, 16> DirStack; | |||
1989 | ||||
1990 | unsigned getDirIndent() { return 4 * DirStack.size(); } | |||
1991 | unsigned getFileIndent() { return 4 * (DirStack.size() + 1); } | |||
1992 | bool containedIn(StringRef Parent, StringRef Path); | |||
1993 | StringRef containedPart(StringRef Parent, StringRef Path); | |||
1994 | void startDirectory(StringRef Path); | |||
1995 | void endDirectory(); | |||
1996 | void writeEntry(StringRef VPath, StringRef RPath); | |||
1997 | ||||
1998 | public: | |||
1999 | JSONWriter(llvm::raw_ostream &OS) : OS(OS) {} | |||
2000 | ||||
2001 | void write(ArrayRef<YAMLVFSEntry> Entries, Optional<bool> UseExternalNames, | |||
2002 | Optional<bool> IsCaseSensitive, Optional<bool> IsOverlayRelative, | |||
2003 | StringRef OverlayDir); | |||
2004 | }; | |||
2005 | ||||
2006 | } // namespace | |||
2007 | ||||
2008 | bool JSONWriter::containedIn(StringRef Parent, StringRef Path) { | |||
2009 | using namespace llvm::sys; | |||
2010 | ||||
2011 | // Compare each path component. | |||
2012 | auto IParent = path::begin(Parent), EParent = path::end(Parent); | |||
2013 | for (auto IChild = path::begin(Path), EChild = path::end(Path); | |||
2014 | IParent != EParent && IChild != EChild; ++IParent, ++IChild) { | |||
2015 | if (*IParent != *IChild) | |||
2016 | return false; | |||
2017 | } | |||
2018 | // Have we exhausted the parent path? | |||
2019 | return IParent == EParent; | |||
2020 | } | |||
2021 | ||||
2022 | StringRef JSONWriter::containedPart(StringRef Parent, StringRef Path) { | |||
2023 | assert(!Parent.empty())((!Parent.empty()) ? static_cast<void> (0) : __assert_fail ("!Parent.empty()", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2023, __PRETTY_FUNCTION__)); | |||
2024 | assert(containedIn(Parent, Path))((containedIn(Parent, Path)) ? static_cast<void> (0) : __assert_fail ("containedIn(Parent, Path)", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2024, __PRETTY_FUNCTION__)); | |||
2025 | return Path.slice(Parent.size() + 1, StringRef::npos); | |||
2026 | } | |||
2027 | ||||
2028 | void JSONWriter::startDirectory(StringRef Path) { | |||
2029 | StringRef Name = | |||
2030 | DirStack.empty() ? Path : containedPart(DirStack.back(), Path); | |||
2031 | DirStack.push_back(Path); | |||
2032 | unsigned Indent = getDirIndent(); | |||
2033 | OS.indent(Indent) << "{\n"; | |||
2034 | OS.indent(Indent + 2) << "'type': 'directory',\n"; | |||
2035 | OS.indent(Indent + 2) << "'name': \"" << llvm::yaml::escape(Name) << "\",\n"; | |||
2036 | OS.indent(Indent + 2) << "'contents': [\n"; | |||
2037 | } | |||
2038 | ||||
2039 | void JSONWriter::endDirectory() { | |||
2040 | unsigned Indent = getDirIndent(); | |||
2041 | OS.indent(Indent + 2) << "]\n"; | |||
2042 | OS.indent(Indent) << "}"; | |||
2043 | ||||
2044 | DirStack.pop_back(); | |||
2045 | } | |||
2046 | ||||
2047 | void JSONWriter::writeEntry(StringRef VPath, StringRef RPath) { | |||
2048 | unsigned Indent = getFileIndent(); | |||
2049 | OS.indent(Indent) << "{\n"; | |||
2050 | OS.indent(Indent + 2) << "'type': 'file',\n"; | |||
2051 | OS.indent(Indent + 2) << "'name': \"" << llvm::yaml::escape(VPath) << "\",\n"; | |||
2052 | OS.indent(Indent + 2) << "'external-contents': \"" | |||
2053 | << llvm::yaml::escape(RPath) << "\"\n"; | |||
2054 | OS.indent(Indent) << "}"; | |||
2055 | } | |||
2056 | ||||
2057 | void JSONWriter::write(ArrayRef<YAMLVFSEntry> Entries, | |||
2058 | Optional<bool> UseExternalNames, | |||
2059 | Optional<bool> IsCaseSensitive, | |||
2060 | Optional<bool> IsOverlayRelative, | |||
2061 | StringRef OverlayDir) { | |||
2062 | using namespace llvm::sys; | |||
2063 | ||||
2064 | OS << "{\n" | |||
2065 | " 'version': 0,\n"; | |||
2066 | if (IsCaseSensitive.hasValue()) | |||
2067 | OS << " 'case-sensitive': '" | |||
2068 | << (IsCaseSensitive.getValue() ? "true" : "false") << "',\n"; | |||
2069 | if (UseExternalNames.hasValue()) | |||
2070 | OS << " 'use-external-names': '" | |||
2071 | << (UseExternalNames.getValue() ? "true" : "false") << "',\n"; | |||
2072 | bool UseOverlayRelative = false; | |||
2073 | if (IsOverlayRelative.hasValue()) { | |||
2074 | UseOverlayRelative = IsOverlayRelative.getValue(); | |||
2075 | OS << " 'overlay-relative': '" << (UseOverlayRelative ? "true" : "false") | |||
2076 | << "',\n"; | |||
2077 | } | |||
2078 | OS << " 'roots': [\n"; | |||
2079 | ||||
2080 | if (!Entries.empty()) { | |||
2081 | const YAMLVFSEntry &Entry = Entries.front(); | |||
2082 | startDirectory(path::parent_path(Entry.VPath)); | |||
2083 | ||||
2084 | StringRef RPath = Entry.RPath; | |||
2085 | if (UseOverlayRelative) { | |||
2086 | unsigned OverlayDirLen = OverlayDir.size(); | |||
2087 | assert(RPath.substr(0, OverlayDirLen) == OverlayDir &&((RPath.substr(0, OverlayDirLen) == OverlayDir && "Overlay dir must be contained in RPath" ) ? static_cast<void> (0) : __assert_fail ("RPath.substr(0, OverlayDirLen) == OverlayDir && \"Overlay dir must be contained in RPath\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2088, __PRETTY_FUNCTION__)) | |||
2088 | "Overlay dir must be contained in RPath")((RPath.substr(0, OverlayDirLen) == OverlayDir && "Overlay dir must be contained in RPath" ) ? static_cast<void> (0) : __assert_fail ("RPath.substr(0, OverlayDirLen) == OverlayDir && \"Overlay dir must be contained in RPath\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2088, __PRETTY_FUNCTION__)); | |||
2089 | RPath = RPath.slice(OverlayDirLen, RPath.size()); | |||
2090 | } | |||
2091 | ||||
2092 | writeEntry(path::filename(Entry.VPath), RPath); | |||
2093 | ||||
2094 | for (const auto &Entry : Entries.slice(1)) { | |||
2095 | StringRef Dir = path::parent_path(Entry.VPath); | |||
2096 | if (Dir == DirStack.back()) | |||
2097 | OS << ",\n"; | |||
2098 | else { | |||
2099 | while (!DirStack.empty() && !containedIn(DirStack.back(), Dir)) { | |||
2100 | OS << "\n"; | |||
2101 | endDirectory(); | |||
2102 | } | |||
2103 | OS << ",\n"; | |||
2104 | startDirectory(Dir); | |||
2105 | } | |||
2106 | StringRef RPath = Entry.RPath; | |||
2107 | if (UseOverlayRelative) { | |||
2108 | unsigned OverlayDirLen = OverlayDir.size(); | |||
2109 | assert(RPath.substr(0, OverlayDirLen) == OverlayDir &&((RPath.substr(0, OverlayDirLen) == OverlayDir && "Overlay dir must be contained in RPath" ) ? static_cast<void> (0) : __assert_fail ("RPath.substr(0, OverlayDirLen) == OverlayDir && \"Overlay dir must be contained in RPath\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2110, __PRETTY_FUNCTION__)) | |||
2110 | "Overlay dir must be contained in RPath")((RPath.substr(0, OverlayDirLen) == OverlayDir && "Overlay dir must be contained in RPath" ) ? static_cast<void> (0) : __assert_fail ("RPath.substr(0, OverlayDirLen) == OverlayDir && \"Overlay dir must be contained in RPath\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2110, __PRETTY_FUNCTION__)); | |||
2111 | RPath = RPath.slice(OverlayDirLen, RPath.size()); | |||
2112 | } | |||
2113 | writeEntry(path::filename(Entry.VPath), RPath); | |||
2114 | } | |||
2115 | ||||
2116 | while (!DirStack.empty()) { | |||
2117 | OS << "\n"; | |||
2118 | endDirectory(); | |||
2119 | } | |||
2120 | OS << "\n"; | |||
2121 | } | |||
2122 | ||||
2123 | OS << " ]\n" | |||
2124 | << "}\n"; | |||
2125 | } | |||
2126 | ||||
2127 | void YAMLVFSWriter::write(llvm::raw_ostream &OS) { | |||
2128 | llvm::sort(Mappings, [](const YAMLVFSEntry &LHS, const YAMLVFSEntry &RHS) { | |||
2129 | return LHS.VPath < RHS.VPath; | |||
2130 | }); | |||
2131 | ||||
2132 | JSONWriter(OS).write(Mappings, UseExternalNames, IsCaseSensitive, | |||
2133 | IsOverlayRelative, OverlayDir); | |||
2134 | } | |||
2135 | ||||
2136 | VFSFromYamlDirIterImpl::VFSFromYamlDirIterImpl( | |||
2137 | const Twine &_Path, RedirectingDirectoryEntry::iterator Begin, | |||
2138 | RedirectingDirectoryEntry::iterator End, bool IterateExternalFS, | |||
2139 | FileSystem &ExternalFS, std::error_code &EC) | |||
2140 | : Dir(_Path.str()), Current(Begin), End(End), | |||
2141 | IterateExternalFS(IterateExternalFS), ExternalFS(ExternalFS) { | |||
2142 | EC = incrementImpl(/*IsFirstTime=*/true); | |||
2143 | } | |||
2144 | ||||
2145 | std::error_code VFSFromYamlDirIterImpl::increment() { | |||
2146 | return incrementImpl(/*IsFirstTime=*/false); | |||
2147 | } | |||
2148 | ||||
2149 | std::error_code VFSFromYamlDirIterImpl::incrementExternal() { | |||
2150 | assert(!(IsExternalFSCurrent && ExternalDirIter == directory_iterator()) &&((!(IsExternalFSCurrent && ExternalDirIter == directory_iterator ()) && "incrementing past end") ? static_cast<void > (0) : __assert_fail ("!(IsExternalFSCurrent && ExternalDirIter == directory_iterator()) && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2151, __PRETTY_FUNCTION__)) | |||
2151 | "incrementing past end")((!(IsExternalFSCurrent && ExternalDirIter == directory_iterator ()) && "incrementing past end") ? static_cast<void > (0) : __assert_fail ("!(IsExternalFSCurrent && ExternalDirIter == directory_iterator()) && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2151, __PRETTY_FUNCTION__)); | |||
2152 | std::error_code EC; | |||
2153 | if (IsExternalFSCurrent) { | |||
2154 | ExternalDirIter.increment(EC); | |||
2155 | } else if (IterateExternalFS) { | |||
2156 | ExternalDirIter = ExternalFS.dir_begin(Dir, EC); | |||
2157 | IsExternalFSCurrent = true; | |||
2158 | if (EC && EC != errc::no_such_file_or_directory) | |||
2159 | return EC; | |||
2160 | EC = {}; | |||
2161 | } | |||
2162 | if (EC || ExternalDirIter == directory_iterator()) { | |||
2163 | CurrentEntry = directory_entry(); | |||
2164 | } else { | |||
2165 | CurrentEntry = *ExternalDirIter; | |||
2166 | } | |||
2167 | return EC; | |||
2168 | } | |||
2169 | ||||
2170 | std::error_code VFSFromYamlDirIterImpl::incrementContent(bool IsFirstTime) { | |||
2171 | assert((IsFirstTime || Current != End) && "cannot iterate past end")(((IsFirstTime || Current != End) && "cannot iterate past end" ) ? static_cast<void> (0) : __assert_fail ("(IsFirstTime || Current != End) && \"cannot iterate past end\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2171, __PRETTY_FUNCTION__)); | |||
2172 | if (!IsFirstTime) | |||
2173 | ++Current; | |||
2174 | while (Current != End) { | |||
2175 | SmallString<128> PathStr(Dir); | |||
2176 | llvm::sys::path::append(PathStr, (*Current)->getName()); | |||
2177 | sys::fs::file_type Type; | |||
2178 | switch ((*Current)->getKind()) { | |||
2179 | case EK_Directory: | |||
2180 | Type = sys::fs::file_type::directory_file; | |||
2181 | break; | |||
2182 | case EK_File: | |||
2183 | Type = sys::fs::file_type::regular_file; | |||
2184 | break; | |||
2185 | } | |||
2186 | CurrentEntry = directory_entry(PathStr.str(), Type); | |||
2187 | return {}; | |||
2188 | } | |||
2189 | return incrementExternal(); | |||
2190 | } | |||
2191 | ||||
2192 | std::error_code VFSFromYamlDirIterImpl::incrementImpl(bool IsFirstTime) { | |||
2193 | while (true) { | |||
2194 | std::error_code EC = IsExternalFSCurrent ? incrementExternal() | |||
2195 | : incrementContent(IsFirstTime); | |||
2196 | if (EC || CurrentEntry.path().empty()) | |||
2197 | return EC; | |||
2198 | StringRef Name = llvm::sys::path::filename(CurrentEntry.path()); | |||
2199 | if (SeenNames.insert(Name).second) | |||
2200 | return EC; // name not seen before | |||
2201 | } | |||
2202 | llvm_unreachable("returned above")::llvm::llvm_unreachable_internal("returned above", "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2202); | |||
2203 | } | |||
2204 | ||||
2205 | vfs::recursive_directory_iterator::recursive_directory_iterator( | |||
2206 | FileSystem &FS_, const Twine &Path, std::error_code &EC) | |||
2207 | : FS(&FS_) { | |||
2208 | directory_iterator I = FS->dir_begin(Path, EC); | |||
2209 | if (I != directory_iterator()) { | |||
2210 | State = std::make_shared<detail::RecDirIterState>(); | |||
2211 | State->Stack.push(I); | |||
2212 | } | |||
2213 | } | |||
2214 | ||||
2215 | vfs::recursive_directory_iterator & | |||
2216 | recursive_directory_iterator::increment(std::error_code &EC) { | |||
2217 | assert(FS && State && !State->Stack.empty() && "incrementing past end")((FS && State && !State->Stack.empty() && "incrementing past end") ? static_cast<void> (0) : __assert_fail ("FS && State && !State->Stack.empty() && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2217, __PRETTY_FUNCTION__)); | |||
2218 | assert(!State->Stack.top()->path().empty() && "non-canonical end iterator")((!State->Stack.top()->path().empty() && "non-canonical end iterator" ) ? static_cast<void> (0) : __assert_fail ("!State->Stack.top()->path().empty() && \"non-canonical end iterator\"" , "/build/llvm-toolchain-snapshot-8~svn350071/lib/Support/VirtualFileSystem.cpp" , 2218, __PRETTY_FUNCTION__)); | |||
2219 | vfs::directory_iterator End; | |||
2220 | ||||
2221 | if (State->HasNoPushRequest) | |||
2222 | State->HasNoPushRequest = false; | |||
2223 | else { | |||
2224 | if (State->Stack.top()->type() == sys::fs::file_type::directory_file) { | |||
2225 | vfs::directory_iterator I = FS->dir_begin(State->Stack.top()->path(), EC); | |||
2226 | if (I != End) { | |||
2227 | State->Stack.push(I); | |||
2228 | return *this; | |||
2229 | } | |||
2230 | } | |||
2231 | } | |||
2232 | ||||
2233 | while (!State->Stack.empty() && State->Stack.top().increment(EC) == End) | |||
2234 | State->Stack.pop(); | |||
2235 | ||||
2236 | if (State->Stack.empty()) | |||
2237 | State.reset(); // end iterator | |||
2238 | ||||
2239 | return *this; | |||
2240 | } |