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diff --git a/clang-r353983/include/llvm/XRay/BlockPrinter.h b/clang-r353983/include/llvm/XRay/BlockPrinter.h
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+++ b/clang-r353983/include/llvm/XRay/BlockPrinter.h
@@ -0,0 +1,61 @@
+//===- BlockPrinter.h - FDR Block Pretty Printer -------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// An implementation of the RecordVisitor which formats a block of records for
+// easier human consumption.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_INCLUDE_LLVM_XRAY_BLOCKPRINTER_H_
+#define LLVM_INCLUDE_LLVM_XRAY_BLOCKPRINTER_H_
+
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/XRay/FDRRecords.h"
+#include "llvm/XRay/RecordPrinter.h"
+
+namespace llvm {
+namespace xray {
+
+class BlockPrinter : public RecordVisitor {
+  enum class State {
+    Start,
+    Preamble,
+    Metadata,
+    Function,
+    Arg,
+    CustomEvent,
+    End,
+  };
+
+  raw_ostream &OS;
+  RecordPrinter &RP;
+  State CurrentState = State::Start;
+
+public:
+  explicit BlockPrinter(raw_ostream &O, RecordPrinter &P)
+      : RecordVisitor(), OS(O), RP(P) {}
+
+  Error visit(BufferExtents &) override;
+  Error visit(WallclockRecord &) override;
+  Error visit(NewCPUIDRecord &) override;
+  Error visit(TSCWrapRecord &) override;
+  Error visit(CustomEventRecord &) override;
+  Error visit(CallArgRecord &) override;
+  Error visit(PIDRecord &) override;
+  Error visit(NewBufferRecord &) override;
+  Error visit(EndBufferRecord &) override;
+  Error visit(FunctionRecord &) override;
+  Error visit(CustomEventRecordV5 &) override;
+  Error visit(TypedEventRecord &) override;
+
+  void reset() { CurrentState = State::Start; }
+};
+
+} // namespace xray
+} // namespace llvm
+
+#endif // LLVM_INCLUDE_LLVM_XRAY_BLOCKPRINTER_H_