Split out llvm/Support/FileSystem/UniqueID.h and clang/Basic/FileEntry.h, NFC

Split `FileEntry` and `FileEntryRef` out into a new file
`clang/Basic/FileEntry.h`. This allows current users of a
forward-declared `FileEntry` to transition to `FileEntryRef` without
adding more includers of `FileManager.h`.

Also split `UniqueID` out to llvm/Support/FileSystem/UniqueID.h, so
`FileEntry.h` doesn't need to include all of `FileSystem.h` for just
that type.

Differential Revision: https://reviews.llvm.org/D89761

1 files changed, 23 insertions, 0 deletions

diff --git a/clang/lib/Basic/FileEntry.cpp b/clang/lib/Basic/FileEntry.cpp
new file mode 100644
index 0000000..29218c7
--- /dev/null
+++ b/clang/lib/Basic/FileEntry.cpp
@@ -0,0 +1,23 @@
+//===- FileEntry.cpp - File references --------------------------*- 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 implementation for clang::FileEntry and clang::FileEntryRef.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/FileEntry.h"
+#include "llvm/Support/VirtualFileSystem.h"
+
+using namespace clang;
+
+FileEntry::FileEntry() : UniqueID(0, 0), IsNamedPipe(false), IsValid(false) {}
+
+FileEntry::~FileEntry() = default;
+
+void FileEntry::closeFile() const { File.reset(); }