vendor/clang/clang-trunk-r351319

1 files changed, 0 insertions, 454 deletions

diff --git a/include/clang/Basic/VirtualFileSystem.h b/include/clang/Basic/VirtualFileSystem.h
deleted file mode 100644
index 2480b91123c15..0000000000000
--- a/include/clang/Basic/VirtualFileSystem.h
+++ /dev/null
@@ -1,454 +0,0 @@
-//===- VirtualFileSystem.h - Virtual File System Layer ----------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-/// \file
-/// Defines the virtual file system interface vfs::FileSystem.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_CLANG_BASIC_VIRTUALFILESYSTEM_H
-#define LLVM_CLANG_BASIC_VIRTUALFILESYSTEM_H
-
-#include "clang/Basic/LLVM.h"
-#include "llvm/ADT/IntrusiveRefCntPtr.h"
-#include "llvm/ADT/None.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/Twine.h"
-#include "llvm/Support/Chrono.h"
-#include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/SourceMgr.h"
-#include <cassert>
-#include <cstdint>
-#include <ctime>
-#include <memory>
-#include <stack>
-#include <string>
-#include <system_error>
-#include <utility>
-#include <vector>
-
-namespace llvm {
-
-class MemoryBuffer;
-
-} // namespace llvm
-
-namespace clang {
-namespace vfs {
-
-/// The result of a \p status operation.
-class Status {
-  std::string Name;
-  llvm::sys::fs::UniqueID UID;
-  llvm::sys::TimePoint<> MTime;
-  uint32_t User;
-  uint32_t Group;
-  uint64_t Size;
-  llvm::sys::fs::file_type Type = llvm::sys::fs::file_type::status_error;
-  llvm::sys::fs::perms Perms;
-
-public:
-   // FIXME: remove when files support multiple names
-  bool IsVFSMapped = false;
-
-  Status() = default;
-  Status(const llvm::sys::fs::file_status &Status);
-  Status(StringRef Name, llvm::sys::fs::UniqueID UID,
-         llvm::sys::TimePoint<> MTime, uint32_t User, uint32_t Group,
-         uint64_t Size, llvm::sys::fs::file_type Type,
-         llvm::sys::fs::perms Perms);
-
-  /// Get a copy of a Status with a different name.
-  static Status copyWithNewName(const Status &In, StringRef NewName);
-  static Status copyWithNewName(const llvm::sys::fs::file_status &In,
-                                StringRef NewName);
-
-  /// Returns the name that should be used for this file or directory.
-  StringRef getName() const { return Name; }
-
-  /// @name Status interface from llvm::sys::fs
-  /// @{
-  llvm::sys::fs::file_type getType() const { return Type; }
-  llvm::sys::fs::perms getPermissions() const { return Perms; }
-  llvm::sys::TimePoint<> getLastModificationTime() const { return MTime; }
-  llvm::sys::fs::UniqueID getUniqueID() const { return UID; }
-  uint32_t getUser() const { return User; }
-  uint32_t getGroup() const { return Group; }
-  uint64_t getSize() const { return Size; }
-  /// @}
-  /// @name Status queries
-  /// These are static queries in llvm::sys::fs.
-  /// @{
-  bool equivalent(const Status &Other) const;
-  bool isDirectory() const;
-  bool isRegularFile() const;
-  bool isOther() const;
-  bool isSymlink() const;
-  bool isStatusKnown() const;
-  bool exists() const;
-  /// @}
-};
-
-/// Represents an open file.
-class File {
-public:
-  /// Destroy the file after closing it (if open).
-  /// Sub-classes should generally call close() inside their destructors.  We
-  /// cannot do that from the base class, since close is virtual.
-  virtual ~File();
-
-  /// Get the status of the file.
-  virtual llvm::ErrorOr<Status> status() = 0;
-
-  /// Get the name of the file
-  virtual llvm::ErrorOr<std::string> getName() {
-    if (auto Status = status())
-      return Status->getName().str();
-    else
-      return Status.getError();
-  }
-
-  /// Get the contents of the file as a \p MemoryBuffer.
-  virtual llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
-  getBuffer(const Twine &Name, int64_t FileSize = -1,
-            bool RequiresNullTerminator = true, bool IsVolatile = false) = 0;
-
-  /// Closes the file.
-  virtual std::error_code close() = 0;
-};
-
-namespace detail {
-
-/// An interface for virtual file systems to provide an iterator over the
-/// (non-recursive) contents of a directory.
-struct DirIterImpl {
-  virtual ~DirIterImpl();
-
-  /// Sets \c CurrentEntry to the next entry in the directory on success,
-  /// or returns a system-defined \c error_code.
-  virtual std::error_code increment() = 0;
-
-  Status CurrentEntry;
-};
-
-} // namespace detail
-
-/// An input iterator over the entries in a virtual path, similar to
-/// llvm::sys::fs::directory_iterator.
-class directory_iterator {
-  std::shared_ptr<detail::DirIterImpl> Impl; // Input iterator semantics on copy
-
-public:
-  directory_iterator(std::shared_ptr<detail::DirIterImpl> I)
-      : Impl(std::move(I)) {
-    assert(Impl.get() != nullptr && "requires non-null implementation");
-    if (!Impl->CurrentEntry.isStatusKnown())
-      Impl.reset(); // Normalize the end iterator to Impl == nullptr.
-  }
-
-  /// Construct an 'end' iterator.
-  directory_iterator() = default;
-
-  /// Equivalent to operator++, with an error code.
-  directory_iterator &increment(std::error_code &EC) {
-    assert(Impl && "attempting to increment past end");
-    EC = Impl->increment();
-    if (!Impl->CurrentEntry.isStatusKnown())
-      Impl.reset(); // Normalize the end iterator to Impl == nullptr.
-    return *this;
-  }
-
-  const Status &operator*() const { return Impl->CurrentEntry; }
-  const Status *operator->() const { return &Impl->CurrentEntry; }
-
-  bool operator==(const directory_iterator &RHS) const {
-    if (Impl && RHS.Impl)
-      return Impl->CurrentEntry.equivalent(RHS.Impl->CurrentEntry);
-    return !Impl && !RHS.Impl;
-  }
-  bool operator!=(const directory_iterator &RHS) const {
-    return !(*this == RHS);
-  }
-};
-
-class FileSystem;
-
-/// An input iterator over the recursive contents of a virtual path,
-/// similar to llvm::sys::fs::recursive_directory_iterator.
-class recursive_directory_iterator {
-  using IterState =
-      std::stack<directory_iterator, std::vector<directory_iterator>>;
-
-  FileSystem *FS;
-  std::shared_ptr<IterState> State; // Input iterator semantics on copy.
-
-public:
-  recursive_directory_iterator(FileSystem &FS, const Twine &Path,
-                               std::error_code &EC);
-
-  /// Construct an 'end' iterator.
-  recursive_directory_iterator() = default;
-
-  /// Equivalent to operator++, with an error code.
-  recursive_directory_iterator &increment(std::error_code &EC);
-
-  const Status &operator*() const { return *State->top(); }
-  const Status *operator->() const { return &*State->top(); }
-
-  bool operator==(const recursive_directory_iterator &Other) const {
-    return State == Other.State; // identity
-  }
-  bool operator!=(const recursive_directory_iterator &RHS) const {
-    return !(*this == RHS);
-  }
-
-  /// Gets the current level. Starting path is at level 0.
-  int level() const {
-    assert(!State->empty() && "Cannot get level without any iteration state");
-    return State->size()-1;
-  }
-};
-
-/// The virtual file system interface.
-class FileSystem : public llvm::ThreadSafeRefCountedBase<FileSystem> {
-public:
-  virtual ~FileSystem();
-
-  /// Get the status of the entry at \p Path, if one exists.
-  virtual llvm::ErrorOr<Status> status(const Twine &Path) = 0;
-
-  /// Get a \p File object for the file at \p Path, if one exists.
-  virtual llvm::ErrorOr<std::unique_ptr<File>>
-  openFileForRead(const Twine &Path) = 0;
-
-  /// This is a convenience method that opens a file, gets its content and then
-  /// closes the file.
-  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
-  getBufferForFile(const Twine &Name, int64_t FileSize = -1,
-                   bool RequiresNullTerminator = true, bool IsVolatile = false);
-
-  /// Get a directory_iterator for \p Dir.
-  /// \note The 'end' iterator is directory_iterator().
-  virtual directory_iterator dir_begin(const Twine &Dir,
-                                       std::error_code &EC) = 0;
-
-  /// Set the working directory. This will affect all following operations on
-  /// this file system and may propagate down for nested file systems.
-  virtual std::error_code setCurrentWorkingDirectory(const Twine &Path) = 0;
-
-  /// Get the working directory of this file system.
-  virtual llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const = 0;
-
-  /// Gets real path of \p Path e.g. collapse all . and .. patterns, resolve
-  /// symlinks. For real file system, this uses `llvm::sys::fs::real_path`.
-  /// This returns errc::operation_not_permitted if not implemented by subclass.
-  virtual std::error_code getRealPath(const Twine &Path,
-                                      SmallVectorImpl<char> &Output) const;
-
-  /// Check whether a file exists. Provided for convenience.
-  bool exists(const Twine &Path);
-
-  /// Make \a Path an absolute path.
-  ///
-  /// Makes \a Path absolute using the current directory if it is not already.
-  /// An empty \a Path will result in the current directory.
-  ///
-  /// /absolute/path   => /absolute/path
-  /// relative/../path => <current-directory>/relative/../path
-  ///
-  /// \param Path A path that is modified to be an absolute path.
-  /// \returns success if \a path has been made absolute, otherwise a
-  ///          platform-specific error_code.
-  std::error_code makeAbsolute(SmallVectorImpl<char> &Path) const;
-};
-
-/// Gets an \p vfs::FileSystem for the 'real' file system, as seen by
-/// the operating system.
-IntrusiveRefCntPtr<FileSystem> getRealFileSystem();
-
-/// A file system that allows overlaying one \p AbstractFileSystem on top
-/// of another.
-///
-/// Consists of a stack of >=1 \p FileSystem objects, which are treated as being
-/// one merged file system. When there is a directory that exists in more than
-/// one file system, the \p OverlayFileSystem contains a directory containing
-/// the union of their contents.  The attributes (permissions, etc.) of the
-/// top-most (most recently added) directory are used.  When there is a file
-/// that exists in more than one file system, the file in the top-most file
-/// system overrides the other(s).
-class OverlayFileSystem : public FileSystem {
-  using FileSystemList = SmallVector<IntrusiveRefCntPtr<FileSystem>, 1>;
-
-  /// The stack of file systems, implemented as a list in order of
-  /// their addition.
-  FileSystemList FSList;
-
-public:
-  OverlayFileSystem(IntrusiveRefCntPtr<FileSystem> Base);
-
-  /// Pushes a file system on top of the stack.
-  void pushOverlay(IntrusiveRefCntPtr<FileSystem> FS);
-
-  llvm::ErrorOr<Status> status(const Twine &Path) override;
-  llvm::ErrorOr<std::unique_ptr<File>>
-  openFileForRead(const Twine &Path) override;
-  directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
-  llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override;
-  std::error_code setCurrentWorkingDirectory(const Twine &Path) override;
-  std::error_code getRealPath(const Twine &Path,
-                              SmallVectorImpl<char> &Output) const override;
-
-  using iterator = FileSystemList::reverse_iterator;
-  using const_iterator = FileSystemList::const_reverse_iterator;
-
-  /// Get an iterator pointing to the most recently added file system.
-  iterator overlays_begin() { return FSList.rbegin(); }
-  const_iterator overlays_begin() const { return FSList.rbegin(); }
-
-  /// Get an iterator pointing one-past the least recently added file
-  /// system.
-  iterator overlays_end() { return FSList.rend(); }
-  const_iterator overlays_end() const { return FSList.rend(); }
-};
-
-namespace detail {
-
-class InMemoryDirectory;
-
-} // namespace detail
-
-/// An in-memory file system.
-class InMemoryFileSystem : public FileSystem {
-  std::unique_ptr<detail::InMemoryDirectory> Root;
-  std::string WorkingDirectory;
-  bool UseNormalizedPaths = true;
-
-public:
-  explicit InMemoryFileSystem(bool UseNormalizedPaths = true);
-  ~InMemoryFileSystem() override;
-
-  /// Add a file containing a buffer or a directory to the VFS with a
-  /// path. The VFS owns the buffer.  If present, User, Group, Type
-  /// and Perms apply to the newly-created file or directory.
-  /// \return true if the file or directory was successfully added,
-  /// false if the file or directory already exists in the file system with
-  /// different contents.
-  bool addFile(const Twine &Path, time_t ModificationTime,
-               std::unique_ptr<llvm::MemoryBuffer> Buffer,
-               Optional<uint32_t> User = None, Optional<uint32_t> Group = None,
-               Optional<llvm::sys::fs::file_type> Type = None,
-               Optional<llvm::sys::fs::perms> Perms = None);
-
-  /// Add a buffer to the VFS with a path. The VFS does not own the buffer.
-  /// If present, User, Group, Type and Perms apply to the newly-created file
-  /// or directory.
-  /// \return true if the file or directory was successfully added,
-  /// false if the file or directory already exists in the file system with
-  /// different contents.
-  bool addFileNoOwn(const Twine &Path, time_t ModificationTime,
-                    llvm::MemoryBuffer *Buffer,
-                    Optional<uint32_t> User = None,
-                    Optional<uint32_t> Group = None,
-                    Optional<llvm::sys::fs::file_type> Type = None,
-                    Optional<llvm::sys::fs::perms> Perms = None);
-
-  std::string toString() const;
-
-  /// Return true if this file system normalizes . and .. in paths.
-  bool useNormalizedPaths() const { return UseNormalizedPaths; }
-
-  llvm::ErrorOr<Status> status(const Twine &Path) override;
-  llvm::ErrorOr<std::unique_ptr<File>>
-  openFileForRead(const Twine &Path) override;
-  directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
-
-  llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override {
-    return WorkingDirectory;
-  }
-  /// Canonicalizes \p Path by combining with the current working
-  /// directory and normalizing the path (e.g. remove dots). If the current
-  /// working directory is not set, this returns errc::operation_not_permitted.
-  ///
-  /// This doesn't resolve symlinks as they are not supported in in-memory file
-  /// system.
-  std::error_code getRealPath(const Twine &Path,
-                              SmallVectorImpl<char> &Output) const override;
-
-  std::error_code setCurrentWorkingDirectory(const Twine &Path) override;
-};
-
-/// Get a globally unique ID for a virtual file or directory.
-llvm::sys::fs::UniqueID getNextVirtualUniqueID();
-
-/// Gets a \p FileSystem for a virtual file system described in YAML
-/// format.
-IntrusiveRefCntPtr<FileSystem>
-getVFSFromYAML(std::unique_ptr<llvm::MemoryBuffer> Buffer,
-               llvm::SourceMgr::DiagHandlerTy DiagHandler,
-               StringRef YAMLFilePath,
-               void *DiagContext = nullptr,
-               IntrusiveRefCntPtr<FileSystem> ExternalFS = getRealFileSystem());
-
-struct YAMLVFSEntry {
-  template <typename T1, typename T2> YAMLVFSEntry(T1 &&VPath, T2 &&RPath)
-      : VPath(std::forward<T1>(VPath)), RPath(std::forward<T2>(RPath)) {}
-  std::string VPath;
-  std::string RPath;
-};
-
-/// Collect all pairs of <virtual path, real path> entries from the
-/// \p YAMLFilePath. This is used by the module dependency collector to forward
-/// the entries into the reproducer output VFS YAML file.
-void collectVFSFromYAML(
-    std::unique_ptr<llvm::MemoryBuffer> Buffer,
-    llvm::SourceMgr::DiagHandlerTy DiagHandler, StringRef YAMLFilePath,
-    SmallVectorImpl<YAMLVFSEntry> &CollectedEntries,
-    void *DiagContext = nullptr,
-    IntrusiveRefCntPtr<FileSystem> ExternalFS = getRealFileSystem());
-
-class YAMLVFSWriter {
-  std::vector<YAMLVFSEntry> Mappings;
-  Optional<bool> IsCaseSensitive;
-  Optional<bool> IsOverlayRelative;
-  Optional<bool> UseExternalNames;
-  Optional<bool> IgnoreNonExistentContents;
-  std::string OverlayDir;
-
-public:
-  YAMLVFSWriter() = default;
-
-  void addFileMapping(StringRef VirtualPath, StringRef RealPath);
-
-  void setCaseSensitivity(bool CaseSensitive) {
-    IsCaseSensitive = CaseSensitive;
-  }
-
-  void setUseExternalNames(bool UseExtNames) {
-    UseExternalNames = UseExtNames;
-  }
-
-  void setIgnoreNonExistentContents(bool IgnoreContents) {
-    IgnoreNonExistentContents = IgnoreContents;
-  }
-
-  void setOverlayDir(StringRef OverlayDirectory) {
-    IsOverlayRelative = true;
-    OverlayDir.assign(OverlayDirectory.str());
-  }
-
-  void write(llvm::raw_ostream &OS);
-};
-
-} // namespace vfs
-} // namespace clang
-
-#endif // LLVM_CLANG_BASIC_VIRTUALFILESYSTEM_H