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diff --git a/include/llvm/XRay/XRayRecord.h b/include/llvm/XRay/XRayRecord.h
new file mode 100644
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+++ b/include/llvm/XRay/XRayRecord.h
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+//===- XRayRecord.h - XRay Trace Record -----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file replicates the record definition for XRay log entries. This should
+// follow the evolution of the log record versions supported in the compiler-rt
+// xray project.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_XRAY_XRAY_RECORD_H
+#define LLVM_XRAY_XRAY_RECORD_H
+
+#include <cstdint>
+
+namespace llvm {
+namespace xray {
+
+/// XRay traces all have a header providing some top-matter information useful
+/// to help tools determine how to interpret the information available in the
+/// trace.
+struct XRayFileHeader {
+  /// Version of the XRay implementation that produced this file.
+  uint16_t Version = 0;
+
+  /// A numeric identifier for the type of file this is. Best used in
+  /// combination with Version.
+  uint16_t Type = 0;
+
+  /// Whether the CPU that produced the timestamp counters (TSC) move at a
+  /// constant rate.
+  bool ConstantTSC;
+
+  /// Whether the CPU that produced the timestamp counters (TSC) do not stop.
+  bool NonstopTSC;
+
+  /// The number of cycles per second for the CPU that produced the timestamp
+  /// counter (TSC) values. Useful for estimating the amount of time that
+  /// elapsed between two TSCs on some platforms.
+  uint64_t CycleFrequency = 0;
+};
+
+/// Determines the supported types of records that could be seen in XRay traces.
+/// This may or may not correspond to actual record types in the raw trace (as
+/// the loader implementation may synthesize this information in the process of
+/// of loading).
+enum class RecordTypes { ENTER, EXIT };
+
+struct XRayRecord {
+  /// The type of record.
+  uint16_t RecordType;
+
+  /// The CPU where the thread is running. We assume number of CPUs <= 256.
+  uint8_t CPU;
+
+  /// Identifies the type of record.
+  RecordTypes Type;
+
+  /// The function ID for the record.
+  int32_t FuncId;
+
+  /// Get the full 8 bytes of the TSC when we get the log record.
+  uint64_t TSC;
+
+  /// The thread ID for the currently running thread.
+  uint32_t TId;
+};
+
+} // namespace xray
+} // namespace llvm
+
+#endif // LLVM_XRAY_XRAY_RECORD_H