Update prebuilt Clang to r353983e.HEADq10.0

clang 9.0.5 (based on r353983e) from build 5696680.

Bug: http://b/135931688
Bug: http://b/136008926
Test: N/A
Change-Id: I922d17410047d2e2df4625615352c588ee71b203

1 files changed, 287 insertions, 0 deletions

diff --git a/clang-r353983e/include/clang/Basic/FileManager.h b/clang-r353983e/include/clang/Basic/FileManager.h
new file mode 100644
index 00000000..88c1467b
--- /dev/null
+++ b/clang-r353983e/include/clang/Basic/FileManager.h
@@ -0,0 +1,287 @@
+//===--- FileManager.h - File System Probing and Caching --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Defines the clang::FileManager interface and associated types.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_FILEMANAGER_H
+#define LLVM_CLANG_BASIC_FILEMANAGER_H
+
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include <ctime>
+#include <map>
+#include <memory>
+#include <string>
+
+namespace llvm {
+
+class MemoryBuffer;
+
+} // end namespace llvm
+
+namespace clang {
+
+class FileSystemStatCache;
+
+/// Cached information about one directory (either on disk or in
+/// the virtual file system).
+class DirectoryEntry {
+  friend class FileManager;
+
+  StringRef Name; // Name of the directory.
+
+public:
+  StringRef getName() const { return Name; }
+};
+
+/// Cached information about one file (either on disk
+/// or in the virtual file system).
+///
+/// If the 'File' member is valid, then this FileEntry has an open file
+/// descriptor for the file.
+class FileEntry {
+  friend class FileManager;
+
+  StringRef Name;             // Name of the file.
+  std::string RealPathName;   // Real path to the file; could be empty.
+  off_t Size;                 // File size in bytes.
+  time_t ModTime;             // Modification time of file.
+  const DirectoryEntry *Dir;  // Directory file lives in.
+  unsigned UID;               // A unique (small) ID for the file.
+  llvm::sys::fs::UniqueID UniqueID;
+  bool IsNamedPipe;
+  bool InPCH;
+  bool IsValid;               // Is this \c FileEntry initialized and valid?
+
+  /// The open file, if it is owned by the \p FileEntry.
+  mutable std::unique_ptr<llvm::vfs::File> File;
+
+public:
+  FileEntry()
+      : UniqueID(0, 0), IsNamedPipe(false), InPCH(false), IsValid(false)
+  {}
+
+  FileEntry(const FileEntry &) = delete;
+  FileEntry &operator=(const FileEntry &) = delete;
+
+  StringRef getName() const { return Name; }
+  StringRef tryGetRealPathName() const { return RealPathName; }
+  bool isValid() const { return IsValid; }
+  off_t getSize() const { return Size; }
+  unsigned getUID() const { return UID; }
+  const llvm::sys::fs::UniqueID &getUniqueID() const { return UniqueID; }
+  bool isInPCH() const { return InPCH; }
+  time_t getModificationTime() const { return ModTime; }
+
+  /// Return the directory the file lives in.
+  const DirectoryEntry *getDir() const { return Dir; }
+
+  bool operator<(const FileEntry &RHS) const { return UniqueID < RHS.UniqueID; }
+
+  /// Check whether the file is a named pipe (and thus can't be opened by
+  /// the native FileManager methods).
+  bool isNamedPipe() const { return IsNamedPipe; }
+
+  void closeFile() const {
+    File.reset(); // rely on destructor to close File
+  }
+
+  // Only for use in tests to see if deferred opens are happening, rather than
+  // relying on RealPathName being empty.
+  bool isOpenForTests() const { return File != nullptr; }
+};
+
+struct FileData;
+
+/// Implements support for file system lookup, file system caching,
+/// and directory search management.
+///
+/// This also handles more advanced properties, such as uniquing files based
+/// on "inode", so that a file with two names (e.g. symlinked) will be treated
+/// as a single file.
+///
+class FileManager : public RefCountedBase<FileManager> {
+  IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS;
+  FileSystemOptions FileSystemOpts;
+
+  /// Cache for existing real directories.
+  std::map<llvm::sys::fs::UniqueID, DirectoryEntry> UniqueRealDirs;
+
+  /// Cache for existing real files.
+  std::map<llvm::sys::fs::UniqueID, FileEntry> UniqueRealFiles;
+
+  /// The virtual directories that we have allocated.
+  ///
+  /// For each virtual file (e.g. foo/bar/baz.cpp), we add all of its parent
+  /// directories (foo/ and foo/bar/) here.
+  SmallVector<std::unique_ptr<DirectoryEntry>, 4> VirtualDirectoryEntries;
+  /// The virtual files that we have allocated.
+  SmallVector<std::unique_ptr<FileEntry>, 4> VirtualFileEntries;
+
+  /// A cache that maps paths to directory entries (either real or
+  /// virtual) we have looked up
+  ///
+  /// The actual Entries for real directories/files are
+  /// owned by UniqueRealDirs/UniqueRealFiles above, while the Entries
+  /// for virtual directories/files are owned by
+  /// VirtualDirectoryEntries/VirtualFileEntries above.
+  ///
+  llvm::StringMap<DirectoryEntry*, llvm::BumpPtrAllocator> SeenDirEntries;
+
+  /// A cache that maps paths to file entries (either real or
+  /// virtual) we have looked up.
+  ///
+  /// \see SeenDirEntries
+  llvm::StringMap<FileEntry*, llvm::BumpPtrAllocator> SeenFileEntries;
+
+  /// The canonical names of directories.
+  llvm::DenseMap<const DirectoryEntry *, llvm::StringRef> CanonicalDirNames;
+
+  /// Storage for canonical names that we have computed.
+  llvm::BumpPtrAllocator CanonicalNameStorage;
+
+  /// Each FileEntry we create is assigned a unique ID #.
+  ///
+  unsigned NextFileUID;
+
+  // Statistics.
+  unsigned NumDirLookups, NumFileLookups;
+  unsigned NumDirCacheMisses, NumFileCacheMisses;
+
+  // Caching.
+  std::unique_ptr<FileSystemStatCache> StatCache;
+
+  bool getStatValue(StringRef Path, FileData &Data, bool isFile,
+                    std::unique_ptr<llvm::vfs::File> *F);
+
+  /// Add all ancestors of the given path (pointing to either a file
+  /// or a directory) as virtual directories.
+  void addAncestorsAsVirtualDirs(StringRef Path);
+
+  /// Fills the RealPathName in file entry.
+  void fillRealPathName(FileEntry *UFE, llvm::StringRef FileName);
+
+public:
+  FileManager(const FileSystemOptions &FileSystemOpts,
+              IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS = nullptr);
+  ~FileManager();
+
+  /// Installs the provided FileSystemStatCache object within
+  /// the FileManager.
+  ///
+  /// Ownership of this object is transferred to the FileManager.
+  ///
+  /// \param statCache the new stat cache to install. Ownership of this
+  /// object is transferred to the FileManager.
+  void setStatCache(std::unique_ptr<FileSystemStatCache> statCache);
+
+  /// Removes the FileSystemStatCache object from the manager.
+  void clearStatCache();
+
+  /// Lookup, cache, and verify the specified directory (real or
+  /// virtual).
+  ///
+  /// This returns NULL if the directory doesn't exist.
+  ///
+  /// \param CacheFailure If true and the file does not exist, we'll cache
+  /// the failure to find this file.
+  const DirectoryEntry *getDirectory(StringRef DirName,
+                                     bool CacheFailure = true);
+
+  /// Lookup, cache, and verify the specified file (real or
+  /// virtual).
+  ///
+  /// This returns NULL if the file doesn't exist.
+  ///
+  /// \param OpenFile if true and the file exists, it will be opened.
+  ///
+  /// \param CacheFailure If true and the file does not exist, we'll cache
+  /// the failure to find this file.
+  const FileEntry *getFile(StringRef Filename, bool OpenFile = false,
+                           bool CacheFailure = true);
+
+  /// Returns the current file system options
+  FileSystemOptions &getFileSystemOpts() { return FileSystemOpts; }
+  const FileSystemOptions &getFileSystemOpts() const { return FileSystemOpts; }
+
+  IntrusiveRefCntPtr<llvm::vfs::FileSystem> getVirtualFileSystem() const {
+    return FS;
+  }
+
+  /// Retrieve a file entry for a "virtual" file that acts as
+  /// if there were a file with the given name on disk.
+  ///
+  /// The file itself is not accessed.
+  const FileEntry *getVirtualFile(StringRef Filename, off_t Size,
+                                  time_t ModificationTime);
+
+  /// Open the specified file as a MemoryBuffer, returning a new
+  /// MemoryBuffer if successful, otherwise returning null.
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
+  getBufferForFile(const FileEntry *Entry, bool isVolatile = false,
+                   bool ShouldCloseOpenFile = true);
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
+  getBufferForFile(StringRef Filename, bool isVolatile = false);
+
+  /// Get the 'stat' information for the given \p Path.
+  ///
+  /// If the path is relative, it will be resolved against the WorkingDir of the
+  /// FileManager's FileSystemOptions.
+  ///
+  /// \returns false on success, true on error.
+  bool getNoncachedStatValue(StringRef Path, llvm::vfs::Status &Result);
+
+  /// Remove the real file \p Entry from the cache.
+  void invalidateCache(const FileEntry *Entry);
+
+  /// If path is not absolute and FileSystemOptions set the working
+  /// directory, the path is modified to be relative to the given
+  /// working directory.
+  /// \returns true if \c path changed.
+  bool FixupRelativePath(SmallVectorImpl<char> &path) const;
+
+  /// Makes \c Path absolute taking into account FileSystemOptions and the
+  /// working directory option.
+  /// \returns true if \c Path changed to absolute.
+  bool makeAbsolutePath(SmallVectorImpl<char> &Path) const;
+
+  /// Produce an array mapping from the unique IDs assigned to each
+  /// file to the corresponding FileEntry pointer.
+  void GetUniqueIDMapping(
+                    SmallVectorImpl<const FileEntry *> &UIDToFiles) const;
+
+  /// Modifies the size and modification time of a previously created
+  /// FileEntry. Use with caution.
+  static void modifyFileEntry(FileEntry *File, off_t Size,
+                              time_t ModificationTime);
+
+  /// Retrieve the canonical name for a given directory.
+  ///
+  /// This is a very expensive operation, despite its results being cached,
+  /// and should only be used when the physical layout of the file system is
+  /// required, which is (almost) never.
+  StringRef getCanonicalName(const DirectoryEntry *Dir);
+
+  void PrintStats() const;
+};
+
+} // end namespace clang
+
+#endif // LLVM_CLANG_BASIC_FILEMANAGER_H