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diff --git a/include/clang/Lex/PreprocessorExcludedConditionalDirectiveSkipMapping.h b/include/clang/Lex/PreprocessorExcludedConditionalDirectiveSkipMapping.h
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index 000000000000..893b7ba7a9f5
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+++ b/include/clang/Lex/PreprocessorExcludedConditionalDirectiveSkipMapping.h
@@ -0,0 +1,31 @@
+//===- PreprocessorExcludedConditionalDirectiveSkipMapping.h - --*- 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_LEX_PREPROCESSOR_EXCLUDED_COND_DIRECTIVE_SKIP_MAPPING_H
+#define LLVM_CLANG_LEX_PREPROCESSOR_EXCLUDED_COND_DIRECTIVE_SKIP_MAPPING_H
+
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+namespace clang {
+
+/// A mapping from an offset into a buffer to the number of bytes that can be
+/// skipped by the preprocessor when skipping over excluded conditional
+/// directive ranges.
+using PreprocessorSkippedRangeMapping = llvm::DenseMap<unsigned, unsigned>;
+
+/// The datastructure that holds the mapping between the active memory buffers
+/// and the individual skip mappings.
+using ExcludedPreprocessorDirectiveSkipMapping =
+    llvm::DenseMap<const llvm::MemoryBuffer *,
+                   const PreprocessorSkippedRangeMapping *>;
+
+} // end namespace clang
+
+#endif // LLVM_CLANG_LEX_PREPROCESSOR_EXCLUDED_COND_DIRECTIVE_SKIP_MAPPING_H