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diff --git a/clang-r353983e/include/llvm/ExecutionEngine/RuntimeDyldChecker.h b/clang-r353983e/include/llvm/ExecutionEngine/RuntimeDyldChecker.h
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+//===---- RuntimeDyldChecker.h - RuntimeDyld tester framework -----*- 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_EXECUTIONENGINE_RUNTIMEDYLDCHECKER_H
+#define LLVM_EXECUTIONENGINE_RUNTIMEDYLDCHECKER_H
+
+#include "llvm/ADT/Optional.h"
+
+#include <cstdint>
+#include <memory>
+#include <string>
+#include <utility>
+
+namespace llvm {
+
+class StringRef;
+class MCDisassembler;
+class MemoryBuffer;
+class MCInstPrinter;
+class RuntimeDyld;
+class RuntimeDyldCheckerImpl;
+class raw_ostream;
+
+/// RuntimeDyld invariant checker for verifying that RuntimeDyld has
+///        correctly applied relocations.
+///
+/// The RuntimeDyldChecker class evaluates expressions against an attached
+/// RuntimeDyld instance to verify that relocations have been applied
+/// correctly.
+///
+/// The expression language supports basic pointer arithmetic and bit-masking,
+/// and has limited disassembler integration for accessing instruction
+/// operands and the next PC (program counter) address for each instruction.
+///
+/// The language syntax is:
+///
+/// check = expr '=' expr
+///
+/// expr = binary_expr
+///      | sliceable_expr
+///
+/// sliceable_expr = '*{' number '}' load_addr_expr [slice]
+///                | '(' expr ')' [slice]
+///                | ident_expr [slice]
+///                | number [slice]
+///
+/// slice = '[' high-bit-index ':' low-bit-index ']'
+///
+/// load_addr_expr = symbol
+///                | '(' symbol '+' number ')'
+///                | '(' symbol '-' number ')'
+///
+/// ident_expr = 'decode_operand' '(' symbol ',' operand-index ')'
+///            | 'next_pc'        '(' symbol ')'
+///            | 'stub_addr' '(' file-name ',' section-name ',' symbol ')'
+///            | symbol
+///
+/// binary_expr = expr '+' expr
+///             | expr '-' expr
+///             | expr '&' expr
+///             | expr '|' expr
+///             | expr '<<' expr
+///             | expr '>>' expr
+///
+class RuntimeDyldChecker {
+public:
+  RuntimeDyldChecker(RuntimeDyld &RTDyld, MCDisassembler *Disassembler,
+                     MCInstPrinter *InstPrinter, raw_ostream &ErrStream);
+  ~RuntimeDyldChecker();
+
+  // Get the associated RTDyld instance.
+  RuntimeDyld& getRTDyld();
+
+  // Get the associated RTDyld instance.
+  const RuntimeDyld& getRTDyld() const;
+
+  /// Check a single expression against the attached RuntimeDyld
+  ///        instance.
+  bool check(StringRef CheckExpr) const;
+
+  /// Scan the given memory buffer for lines beginning with the string
+  ///        in RulePrefix. The remainder of the line is passed to the check
+  ///        method to be evaluated as an expression.
+  bool checkAllRulesInBuffer(StringRef RulePrefix, MemoryBuffer *MemBuf) const;
+
+  /// Returns the address of the requested section (or an error message
+  ///        in the second element of the pair if the address cannot be found).
+  ///
+  /// if 'LocalAddress' is true, this returns the address of the section
+  /// within the linker's memory. If 'LocalAddress' is false it returns the
+  /// address within the target process (i.e. the load address).
+  std::pair<uint64_t, std::string> getSectionAddr(StringRef FileName,
+                                                  StringRef SectionName,
+                                                  bool LocalAddress);
+
+  /// If there is a section at the given local address, return its load
+  ///        address, otherwise return none.
+  Optional<uint64_t> getSectionLoadAddress(void *LocalAddress) const;
+
+private:
+  std::unique_ptr<RuntimeDyldCheckerImpl> Impl;
+};
+
+} // end namespace llvm
+
+#endif