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diff --git a/clang-r353983/include/llvm/Support/PrettyStackTrace.h b/clang-r353983/include/llvm/Support/PrettyStackTrace.h
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+++ b/clang-r353983/include/llvm/Support/PrettyStackTrace.h
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+//===- llvm/Support/PrettyStackTrace.h - Pretty Crash Handling --*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the PrettyStackTraceEntry class, which is used to make
+// crashes give more contextual information about what the program was doing
+// when it crashed.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_PRETTYSTACKTRACE_H
+#define LLVM_SUPPORT_PRETTYSTACKTRACE_H
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/Compiler.h"
+
+namespace llvm {
+  class raw_ostream;
+
+  void EnablePrettyStackTrace();
+
+  /// PrettyStackTraceEntry - This class is used to represent a frame of the
+  /// "pretty" stack trace that is dumped when a program crashes. You can define
+  /// subclasses of this and declare them on the program stack: when they are
+  /// constructed and destructed, they will add their symbolic frames to a
+  /// virtual stack trace.  This gets dumped out if the program crashes.
+  class PrettyStackTraceEntry {
+    friend PrettyStackTraceEntry *ReverseStackTrace(PrettyStackTraceEntry *);
+
+    PrettyStackTraceEntry *NextEntry;
+    PrettyStackTraceEntry(const PrettyStackTraceEntry &) = delete;
+    void operator=(const PrettyStackTraceEntry &) = delete;
+  public:
+    PrettyStackTraceEntry();
+    virtual ~PrettyStackTraceEntry();
+
+    /// print - Emit information about this stack frame to OS.
+    virtual void print(raw_ostream &OS) const = 0;
+
+    /// getNextEntry - Return the next entry in the list of frames.
+    const PrettyStackTraceEntry *getNextEntry() const { return NextEntry; }
+  };
+
+  /// PrettyStackTraceString - This object prints a specified string (which
+  /// should not contain newlines) to the stream as the stack trace when a crash
+  /// occurs.
+  class PrettyStackTraceString : public PrettyStackTraceEntry {
+    const char *Str;
+  public:
+    PrettyStackTraceString(const char *str) : Str(str) {}
+    void print(raw_ostream &OS) const override;
+  };
+
+  /// PrettyStackTraceFormat - This object prints a string (which may use
+  /// printf-style formatting but should not contain newlines) to the stream
+  /// as the stack trace when a crash occurs.
+  class PrettyStackTraceFormat : public PrettyStackTraceEntry {
+    llvm::SmallVector<char, 32> Str;
+  public:
+    PrettyStackTraceFormat(const char *Format, ...);
+    void print(raw_ostream &OS) const override;
+  };
+
+  /// PrettyStackTraceProgram - This object prints a specified program arguments
+  /// to the stream as the stack trace when a crash occurs.
+  class PrettyStackTraceProgram : public PrettyStackTraceEntry {
+    int ArgC;
+    const char *const *ArgV;
+  public:
+    PrettyStackTraceProgram(int argc, const char * const*argv)
+      : ArgC(argc), ArgV(argv) {
+      EnablePrettyStackTrace();
+    }
+    void print(raw_ostream &OS) const override;
+  };
+
+  /// Returns the topmost element of the "pretty" stack state.
+  const void *SavePrettyStackState();
+
+  /// Restores the topmost element of the "pretty" stack state to State, which
+  /// should come from a previous call to SavePrettyStackState().  This is
+  /// useful when using a CrashRecoveryContext in code that also uses
+  /// PrettyStackTraceEntries, to make sure the stack that's printed if a crash
+  /// happens after a crash that's been recovered by CrashRecoveryContext
+  /// doesn't have frames on it that were added in code unwound by the
+  /// CrashRecoveryContext.
+  void RestorePrettyStackState(const void *State);
+
+} // end namespace llvm
+
+#endif