Import LLVM 8.0.0 release including clang, lld and lldb.

1 files changed, 26 insertions, 44 deletions

diff --git a/gnu/llvm/tools/clang/lib/Basic/FileManager.cpp b/gnu/llvm/tools/clang/lib/Basic/FileManager.cpp
index d339b972ae8..01ec1d69cde 100644
--- a/gnu/llvm/tools/clang/lib/Basic/FileManager.cpp
+++ b/gnu/llvm/tools/clang/lib/Basic/FileManager.cpp
@@ -49,7 +49,7 @@ using namespace clang;
 //===----------------------------------------------------------------------===//
 
 FileManager::FileManager(const FileSystemOptions &FSO,
-                         IntrusiveRefCntPtr<vfs::FileSystem> FS)
+                         IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS)
     : FS(std::move(FS)), FileSystemOpts(FSO), SeenDirEntries(64),
       SeenFileEntries(64), NextFileUID(0) {
   NumDirLookups = NumFileLookups = 0;
@@ -58,49 +58,17 @@ FileManager::FileManager(const FileSystemOptions &FSO,
   // If the caller doesn't provide a virtual file system, just grab the real
   // file system.
   if (!this->FS)
-    this->FS = vfs::getRealFileSystem();
+    this->FS = llvm::vfs::getRealFileSystem();
 }
 
 FileManager::~FileManager() = default;
 
-void FileManager::addStatCache(std::unique_ptr<FileSystemStatCache> statCache,
-                               bool AtBeginning) {
+void FileManager::setStatCache(std::unique_ptr<FileSystemStatCache> statCache) {
   assert(statCache && "No stat cache provided?");
-  if (AtBeginning || !StatCache.get()) {
-    statCache->setNextStatCache(std::move(StatCache));
-    StatCache = std::move(statCache);
-    return;
-  }
-
-  FileSystemStatCache *LastCache = StatCache.get();
-  while (LastCache->getNextStatCache())
-    LastCache = LastCache->getNextStatCache();
-
-  LastCache->setNextStatCache(std::move(statCache));
+  StatCache = std::move(statCache);
 }
 
-void FileManager::removeStatCache(FileSystemStatCache *statCache) {
-  if (!statCache)
-    return;
-
-  if (StatCache.get() == statCache) {
-    // This is the first stat cache.
-    StatCache = StatCache->takeNextStatCache();
-    return;
-  }
-
-  // Find the stat cache in the list.
-  FileSystemStatCache *PrevCache = StatCache.get();
-  while (PrevCache && PrevCache->getNextStatCache() != statCache)
-    PrevCache = PrevCache->getNextStatCache();
-
-  assert(PrevCache && "Stat cache not found for removal");
-  PrevCache->setNextStatCache(statCache->takeNextStatCache());
-}
-
-void FileManager::clearStatCaches() {
-  StatCache.reset();
-}
+void FileManager::clearStatCache() { StatCache.reset(); }
 
 /// Retrieve the directory that the given file name resides in.
 /// Filename can point to either a real file or a virtual file.
@@ -252,7 +220,7 @@ const FileEntry *FileManager::getFile(StringRef Filename, bool openFile,
   // FIXME: This will reduce the # syscalls.
 
   // Nope, there isn't.  Check to see if the file exists.
-  std::unique_ptr<vfs::File> F;
+  std::unique_ptr<llvm::vfs::File> F;
   FileData Data;
   if (getStatValue(InterndFileName, Data, true, openFile ? &F : nullptr)) {
     // There's no real file at the given path.
@@ -315,9 +283,11 @@ const FileEntry *FileManager::getFile(StringRef Filename, bool openFile,
   UFE.InPCH = Data.InPCH;
   UFE.File = std::move(F);
   UFE.IsValid = true;
-  if (UFE.File)
-    if (auto RealPathName = UFE.File->getName())
-      UFE.RealPathName = *RealPathName;
+
+  if (UFE.File) {
+    if (auto PathName = UFE.File->getName())
+      fillRealPathName(&UFE, *PathName);
+  }
   return &UFE;
 }
 
@@ -373,6 +343,7 @@ FileManager::getVirtualFile(StringRef Filename, off_t Size,
     UFE->UniqueID = Data.UniqueID;
     UFE->IsNamedPipe = Data.IsNamedPipe;
     UFE->InPCH = Data.InPCH;
+    fillRealPathName(UFE, Data.Name);
   }
 
   if (!UFE) {
@@ -415,6 +386,17 @@ bool FileManager::makeAbsolutePath(SmallVectorImpl<char> &Path) const {
   return Changed;
 }
 
+void FileManager::fillRealPathName(FileEntry *UFE, llvm::StringRef FileName) {
+  llvm::SmallString<128> AbsPath(FileName);
+  // This is not the same as `VFS::getRealPath()`, which resolves symlinks
+  // but can be very expensive on real file systems.
+  // FIXME: the semantic of RealPathName is unclear, and the name might be
+  // misleading. We need to clean up the interface here.
+  makeAbsolutePath(AbsPath);
+  llvm::sys::path::remove_dots(AbsPath, /*remove_dot_dot=*/true);
+  UFE->RealPathName = AbsPath.str();
+}
+
 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
 FileManager::getBufferForFile(const FileEntry *Entry, bool isVolatile,
                               bool ShouldCloseOpenFile) {
@@ -465,7 +447,7 @@ FileManager::getBufferForFile(StringRef Filename, bool isVolatile) {
 /// false if it's an existent real file.  If FileDescriptor is NULL,
 /// do directory look-up instead of file look-up.
 bool FileManager::getStatValue(StringRef Path, FileData &Data, bool isFile,
-                               std::unique_ptr<vfs::File> *F) {
+                               std::unique_ptr<llvm::vfs::File> *F) {
   // FIXME: FileSystemOpts shouldn't be passed in here, all paths should be
   // absolute!
   if (FileSystemOpts.WorkingDir.empty())
@@ -479,11 +461,11 @@ bool FileManager::getStatValue(StringRef Path, FileData &Data, bool isFile,
 }
 
 bool FileManager::getNoncachedStatValue(StringRef Path,
-                                        vfs::Status &Result) {
+                                        llvm::vfs::Status &Result) {
   SmallString<128> FilePath(Path);
   FixupRelativePath(FilePath);
 
-  llvm::ErrorOr<vfs::Status> S = FS->status(FilePath.c_str());
+  llvm::ErrorOr<llvm::vfs::Status> S = FS->status(FilePath.c_str());
   if (!S)
     return true;
   Result = *S;