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diff --git a/clang-r353983/include/clang/Frontend/LayoutOverrideSource.h b/clang-r353983/include/clang/Frontend/LayoutOverrideSource.h
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+++ b/clang-r353983/include/clang/Frontend/LayoutOverrideSource.h
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+//===--- LayoutOverrideSource.h --Override Record Layouts -------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_FRONTEND_LAYOUTOVERRIDESOURCE_H
+#define LLVM_CLANG_FRONTEND_LAYOUTOVERRIDESOURCE_H
+
+#include "clang/AST/ExternalASTSource.h"
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace clang {
+  /// An external AST source that overrides the layout of
+  /// a specified set of record types.
+  ///
+  /// This class is used only for testing the ability of external AST sources
+  /// to override the layout of record types. Its input is the output format
+  /// of the command-line argument -fdump-record-layouts.
+  class LayoutOverrideSource : public ExternalASTSource {
+    /// The layout of a given record.
+    struct Layout {
+      /// The size of the record.
+      uint64_t Size;
+
+      /// The alignment of the record.
+      uint64_t Align;
+
+      /// The offsets of the fields, in source order.
+      SmallVector<uint64_t, 8> FieldOffsets;
+    };
+
+    /// The set of layouts that will be overridden.
+    llvm::StringMap<Layout> Layouts;
+
+  public:
+    /// Create a new AST source that overrides the layout of some
+    /// set of record types.
+    ///
+    /// The file is the result of passing -fdump-record-layouts to a file.
+    explicit LayoutOverrideSource(StringRef Filename);
+
+    /// If this particular record type has an overridden layout,
+    /// return that layout.
+    bool
+    layoutRecordType(const RecordDecl *Record,
+       uint64_t &Size, uint64_t &Alignment,
+       llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
+       llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
+       llvm::DenseMap<const CXXRecordDecl *,
+                      CharUnits> &VirtualBaseOffsets) override;
+
+    /// Dump the overridden layouts.
+    void dump();
+  };
+}
+
+#endif