upstream_utils/llvm_patches/0009-Remove-unused-functions.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: PJ Reiniger <pj.reiniger@gmail.com>
Date: Sun, 8 May 2022 13:43:50 -0400
Subject: [PATCH 09/31] Remove unused functions

---
 llvm/include/llvm/ADT/SmallString.h      |  85 +-----
 llvm/include/llvm/Support/Errno.h        |   9 -
 llvm/include/llvm/Support/VersionTuple.h |  39 ---
 llvm/include/llvm/Support/raw_ostream.h  | 127 +--------
 llvm/lib/Support/raw_ostream.cpp         | 329 -----------------------
 5 files changed, 10 insertions(+), 579 deletions(-)

diff --git a/llvm/include/llvm/ADT/SmallString.h b/llvm/include/llvm/ADT/SmallString.h
index 4d673cc8b1c49cf8a3f19653de53881cd12662ee..bfa965fd68a09d7ca3b332e38585ae37a5982ed0 100644
--- a/llvm/include/llvm/ADT/SmallString.h
+++ b/llvm/include/llvm/ADT/SmallString.h
@@ -88,49 +88,12 @@ public:
   /// @name String Comparison
   /// @{
 
-  /// Check for string equality.  This is more efficient than compare() when
-  /// the relative ordering of inequal strings isn't needed.
-  bool equals(std::string_view RHS) const {
-    return str().equals(RHS);
-  }
-
-  /// Check for string equality, ignoring case.
-  bool equals_insensitive(std::string_view RHS) const {
-    return str().equals_insensitive(RHS);
-  }
-
-  /// compare - Compare two strings; the result is negative, zero, or positive
-  /// if this string is lexicographically less than, equal to, or greater than
-  /// the \p RHS.
+  /// Compare two strings; the result is -1, 0, or 1 if this string is
+  /// lexicographically less than, equal to, or greater than the \p RHS.
   int compare(std::string_view RHS) const {
     return str().compare(RHS);
   }
 
-  /// compare_insensitive - Compare two strings, ignoring case.
-  int compare_insensitive(std::string_view RHS) const {
-    return str().compare_insensitive(RHS);
-  }
-
-  /// compare_numeric - Compare two strings, treating sequences of digits as
-  /// numbers.
-  int compare_numeric(std::string_view RHS) const {
-    return str().compare_numeric(RHS);
-  }
-
-  /// @}
-  /// @name String Predicates
-  /// @{
-
-  /// startswith - Check if this string starts with the given \p Prefix.
-  bool startswith(std::string_view Prefix) const {
-    return str().startswith(Prefix);
-  }
-
-  /// endswith - Check if this string ends with the given \p Suffix.
-  bool endswith(std::string_view Suffix) const {
-    return str().endswith(Suffix);
-  }
-
   /// @}
   /// @name String Searching
   /// @{
@@ -211,50 +174,6 @@ public:
   }
 
   /// @}
-  /// @name Helpful Algorithms
-  /// @{
-
-  /// Return the number of occurrences of \p C in the string.
-  size_t count(char C) const {
-    return str().count(C);
-  }
-
-  /// Return the number of non-overlapped occurrences of \p Str in the
-  /// string.
-  size_t count(std::string_view Str) const {
-    return str().count(Str);
-  }
-
-  /// @}
-  /// @name Substring Operations
-  /// @{
-
-  /// Return a reference to the substring from [Start, Start + N).
-  ///
-  /// \param Start The index of the starting character in the substring; if
-  /// the index is npos or greater than the length of the string then the
-  /// empty substring will be returned.
-  ///
-  /// \param N The number of characters to included in the substring. If \p N
-  /// exceeds the number of characters remaining in the string, the string
-  /// suffix (starting with \p Start) will be returned.
-  std::string_view substr(size_t Start, size_t N = std::string_view::npos) const {
-    return str().substr(Start, N);
-  }
-
-  /// Return a reference to the substring from [Start, End).
-  ///
-  /// \param Start The index of the starting character in the substring; if
-  /// the index is npos or greater than the length of the string then the
-  /// empty substring will be returned.
-  ///
-  /// \param End The index following the last character to include in the
-  /// substring. If this is npos, or less than \p Start, or exceeds the
-  /// number of characters remaining in the string, the string suffix
-  /// (starting with \p Start) will be returned.
-  std::string_view slice(size_t Start, size_t End) const {
-    return str().slice(Start, End);
-  }
 
   // Extra methods.
 
diff --git a/llvm/include/llvm/Support/Errno.h b/llvm/include/llvm/Support/Errno.h
index e095c66b90860001d90b5c2eb74f6032de6de454..787805dac6c5e3c8cb85dabeb80254443d60806c 100644
--- a/llvm/include/llvm/Support/Errno.h
+++ b/llvm/include/llvm/Support/Errno.h
@@ -19,15 +19,6 @@
 namespace llvm {
 namespace sys {
 
-/// Returns a string representation of the errno value, using whatever
-/// thread-safe variant of strerror() is available.  Be sure to call this
-/// immediately after the function that set errno, or errno may have been
-/// overwritten by an intervening call.
-std::string StrError();
-
-/// Like the no-argument version above, but uses \p errnum instead of errno.
-std::string StrError(int errnum);
-
 template <typename FailT, typename Fun, typename... Args>
 inline decltype(auto) RetryAfterSignal(const FailT &Fail, const Fun &F,
                                        const Args &... As) {
diff --git a/llvm/include/llvm/Support/VersionTuple.h b/llvm/include/llvm/Support/VersionTuple.h
index 953b40701dc934c1a356b5413c9c6c692d5f5679..30cf717973fb15ff65a47a2d80795c351b0d2768 100644
--- a/llvm/include/llvm/Support/VersionTuple.h
+++ b/llvm/include/llvm/Support/VersionTuple.h
@@ -168,45 +168,6 @@ public:
   friend bool operator>=(const VersionTuple &X, const VersionTuple &Y) {
     return !(X < Y);
   }
-
-  friend hash_code hash_value(const VersionTuple &VT) {
-    return hash_combine(VT.Major, VT.Minor, VT.Subminor, VT.Build);
-  }
-
-  template <typename HasherT, llvm::support::endianness Endianness>
-  friend void addHash(HashBuilderImpl<HasherT, Endianness> &HBuilder,
-                      const VersionTuple &VT) {
-    HBuilder.add(VT.Major, VT.Minor, VT.Subminor, VT.Build);
-  }
-
-  /// Retrieve a string representation of the version number.
-  std::string getAsString() const;
-};
-
-/// Print a version number.
-raw_ostream &operator<<(raw_ostream &Out, const VersionTuple &V);
-
-// Provide DenseMapInfo for version tuples.
-template <> struct DenseMapInfo<VersionTuple> {
-  static inline VersionTuple getEmptyKey() { return VersionTuple(0x7FFFFFFF); }
-  static inline VersionTuple getTombstoneKey() {
-    return VersionTuple(0x7FFFFFFE);
-  }
-  static unsigned getHashValue(const VersionTuple &Value) {
-    unsigned Result = Value.getMajor();
-    if (auto Minor = Value.getMinor())
-      Result = detail::combineHashValue(Result, *Minor);
-    if (auto Subminor = Value.getSubminor())
-      Result = detail::combineHashValue(Result, *Subminor);
-    if (auto Build = Value.getBuild())
-      Result = detail::combineHashValue(Result, *Build);
-
-    return Result;
-  }
-
-  static bool isEqual(const VersionTuple &LHS, const VersionTuple &RHS) {
-    return LHS == RHS;
-  }
 };
 
 } // end namespace llvm
diff --git a/llvm/include/llvm/Support/raw_ostream.h b/llvm/include/llvm/Support/raw_ostream.h
index 5d08596b4cf6bf9e9b8e2c2c1aef731bb8832da5..95019180a9deb406ed4f2991c664a4cc4e956dac 100644
--- a/llvm/include/llvm/Support/raw_ostream.h
+++ b/llvm/include/llvm/Support/raw_ostream.h
@@ -261,32 +261,6 @@ public:
     return write(Str.data(), Str.size());
   }
 
-  raw_ostream &operator<<(unsigned long N);
-  raw_ostream &operator<<(long N);
-  raw_ostream &operator<<(unsigned long long N);
-  raw_ostream &operator<<(long long N);
-  raw_ostream &operator<<(const void *P);
-
-  raw_ostream &operator<<(unsigned int N) {
-    return this->operator<<(static_cast<unsigned long>(N));
-  }
-
-  raw_ostream &operator<<(int N) {
-    return this->operator<<(static_cast<long>(N));
-  }
-
-  raw_ostream &operator<<(double N);
-
-  /// Output \p N in hexadecimal, without any prefix or padding.
-  raw_ostream &write_hex(unsigned long long N);
-
-  // Change the foreground color of text.
-  raw_ostream &operator<<(Colors C);
-
-  /// Output a formatted UUID with dash separators.
-  using uuid_t = uint8_t[16];
-  raw_ostream &write_uuid(const uuid_t UUID);
-
   /// Output \p Str, turning '\\', '\t', '\n', '"', and anything that doesn't
   /// satisfy llvm::isPrint into an escape sequence.
   raw_ostream &write_escaped(std::string_view Str, bool UseHexEscapes = false);
@@ -294,21 +268,6 @@ public:
   raw_ostream &write(unsigned char C);
   raw_ostream &write(const char *Ptr, size_t Size);
 
-  // Formatted output, see the format() function in Support/Format.h.
-  raw_ostream &operator<<(const format_object_base &Fmt);
-
-  // Formatted output, see the leftJustify() function in Support/Format.h.
-  raw_ostream &operator<<(const FormattedString &);
-
-  // Formatted output, see the formatHex() function in Support/Format.h.
-  raw_ostream &operator<<(const FormattedNumber &);
-
-  // Formatted output, see the formatv() function in Support/FormatVariadic.h.
-  raw_ostream &operator<<(const formatv_object_base &);
-
-  // Formatted output, see the format_bytes() function in Support/Format.h.
-  raw_ostream &operator<<(const FormattedBytes &);
-
   /// indent - Insert 'NumSpaces' spaces.
   raw_ostream &indent(unsigned NumSpaces);
 
@@ -323,14 +282,19 @@ public:
   /// @param BG if true change the background, default: change foreground
   /// @returns itself so it can be used within << invocations
   virtual raw_ostream &changeColor(enum Colors Color, bool Bold = false,
-                                   bool BG = false);
+                                   bool BG = false)  {
+    (void)Color;
+    (void)Bold;
+    (void)BG;
+    return *this;
+  }
 
   /// Resets the colors to terminal defaults. Call this when you are done
   /// outputting colored text, or before program exit.
-  virtual raw_ostream &resetColor();
+  virtual raw_ostream &resetColor() { return *this; }
 
   /// Reverses the foreground and background colors.
-  virtual raw_ostream &reverseColor();
+  virtual raw_ostream &reverseColor() { return *this; }
 
   /// This function determines if this stream is connected to a "tty" or
   /// "console" window. That is, the output would be displayed to the user
@@ -405,10 +369,6 @@ private:
   /// unused bytes in the buffer.
   void copy_to_buffer(const char *Ptr, size_t Size);
 
-  /// Compute whether colors should be used and do the necessary work such as
-  /// flushing. The result is affected by calls to enable_color().
-  bool prepare_colors();
-
   /// Flush the tied-to stream (if present) and then write the required data.
   void flush_tied_then_write(const char *Ptr, size_t Size);
 
@@ -460,7 +420,6 @@ class raw_fd_ostream : public raw_pwrite_stream {
   bool ShouldClose;
   bool SupportsSeeking = false;
   bool IsRegularFile = false;
-  mutable std::optional<bool> HasColors;
 
 #ifdef _WIN32
   /// True if this fd refers to a Windows console device. Mintty and other
@@ -536,10 +495,6 @@ public:
   /// to the offset specified from the beginning of the file.
   uint64_t seek(uint64_t off);
 
-  bool is_displayed() const override;
-
-  bool has_colors() const override;
-
   std::error_code error() const { return EC; }
 
   /// Return the value of the flag in this raw_fd_ostream indicating whether an
@@ -558,38 +513,6 @@ public:
   ///      - from The Zen of Python, by Tim Peters
   ///
   void clear_error() { EC = std::error_code(); }
-
-  /// Locks the underlying file.
-  ///
-  /// @returns RAII object that releases the lock upon leaving the scope, if the
-  ///          locking was successful. Otherwise returns corresponding
-  ///          error code.
-  ///
-  /// The function blocks the current thread until the lock become available or
-  /// error occurs.
-  ///
-  /// Possible use of this function may be as follows:
-  ///
-  ///   @code{.cpp}
-  ///   if (auto L = stream.lock()) {
-  ///     // ... do action that require file to be locked.
-  ///   } else {
-  ///     handleAllErrors(std::move(L.takeError()), [&](ErrorInfoBase &EIB) {
-  ///       // ... handle lock error.
-  ///     });
-  ///   }
-  ///   @endcode
-  [[nodiscard]] Expected<sys::fs::FileLocker> lock();
-
-  /// Tries to lock the underlying file within the specified period.
-  ///
-  /// @returns RAII object that releases the lock upon leaving the scope, if the
-  ///          locking was successful. Otherwise returns corresponding
-  ///          error code.
-  ///
-  /// It is used as @ref lock.
-  [[nodiscard]] Expected<sys::fs::FileLocker>
-  tryLockFor(Duration const &Timeout);
 };
 
 /// This returns a reference to a raw_fd_ostream for standard output. Use it
@@ -619,17 +542,6 @@ public:
   /// immediately destroyed.
   raw_fd_stream(std::string_view Filename, std::error_code &EC);
 
-  /// This reads the \p Size bytes into a buffer pointed by \p Ptr.
-  ///
-  /// \param Ptr The start of the buffer to hold data to be read.
-  ///
-  /// \param Size The number of bytes to be read.
-  ///
-  /// On success, the number of bytes read is returned, and the file position is
-  /// advanced by this number. On error, -1 is returned, use error() to get the
-  /// error code.
-  ssize_t read(char *Ptr, size_t Size);
-
   /// Check if \p OS is a pointer of type raw_fd_stream*.
   static bool classof(const raw_ostream *OS);
 };
@@ -747,29 +659,6 @@ public:
   ~buffer_unique_ostream() override { *OS << str(); }
 };
 
-class Error;
-
-/// This helper creates an output stream and then passes it to \p Write.
-/// The stream created is based on the specified \p OutputFileName:
-/// llvm::outs for "-", raw_null_ostream for "/dev/null", and raw_fd_ostream
-/// for other names. For raw_fd_ostream instances, the stream writes to
-/// a temporary file. The final output file is atomically replaced with the
-/// temporary file after the \p Write function is finished.
-Error writeToOutput(std::string_view OutputFileName,
-                    std::function<Error(raw_ostream &)> Write);
-
-raw_ostream &operator<<(raw_ostream &OS, std::nullopt_t);
-
-template <typename T, typename = decltype(std::declval<raw_ostream &>()
-                                          << std::declval<const T &>())>
-raw_ostream &operator<<(raw_ostream &OS, const std::optional<T> &O) {
-  if (O)
-    OS << *O;
-  else
-    OS << std::nullopt;
-  return OS;
-}
-
 } // end namespace llvm
 
 #endif // LLVM_SUPPORT_RAW_OSTREAM_H
diff --git a/llvm/lib/Support/raw_ostream.cpp b/llvm/lib/Support/raw_ostream.cpp
index a23f567a37abdc199363607446f33f29e021d7ad..76c32155b4296fbbf3f4b164cd58d63f472ccd5e 100644
--- a/llvm/lib/Support/raw_ostream.cpp
+++ b/llvm/lib/Support/raw_ostream.cpp
@@ -18,7 +18,6 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Config/config.h"
 #include "llvm/Support/Compiler.h"
-#include "llvm/Support/Duration.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Format.h"
@@ -127,49 +126,6 @@ void raw_ostream::SetBufferAndMode(char *BufferStart, size_t Size,
   assert(OutBufStart <= OutBufEnd && "Invalid size!");
 }
 
-raw_ostream &raw_ostream::operator<<(unsigned long N) {
-  write_integer(*this, static_cast<uint64_t>(N), 0, IntegerStyle::Integer);
-  return *this;
-}
-
-raw_ostream &raw_ostream::operator<<(long N) {
-  write_integer(*this, static_cast<int64_t>(N), 0, IntegerStyle::Integer);
-  return *this;
-}
-
-raw_ostream &raw_ostream::operator<<(unsigned long long N) {
-  write_integer(*this, static_cast<uint64_t>(N), 0, IntegerStyle::Integer);
-  return *this;
-}
-
-raw_ostream &raw_ostream::operator<<(long long N) {
-  write_integer(*this, static_cast<int64_t>(N), 0, IntegerStyle::Integer);
-  return *this;
-}
-
-raw_ostream &raw_ostream::write_hex(unsigned long long N) {
-  llvm::write_hex(*this, N, HexPrintStyle::Lower);
-  return *this;
-}
-
-raw_ostream &raw_ostream::operator<<(Colors C) {
-  if (C == Colors::RESET)
-    resetColor();
-  else
-    changeColor(C);
-  return *this;
-}
-
-raw_ostream &raw_ostream::write_uuid(const uuid_t UUID) {
-  for (int Idx = 0; Idx < 16; ++Idx) {
-    *this << format("%02" PRIX32, UUID[Idx]);
-    if (Idx == 3 || Idx == 5 || Idx == 7 || Idx == 9)
-      *this << "-";
-  }
-  return *this;
-}
-
-
 raw_ostream &raw_ostream::write_escaped(std::string_view Str,
                                         bool UseHexEscapes) {
   for (unsigned char c : Str) {
@@ -315,173 +271,6 @@ void raw_ostream::flush_tied_then_write(const char *Ptr, size_t Size) {
   write_impl(Ptr, Size);
 }
 
-// Formatted output.
-raw_ostream &raw_ostream::operator<<(const format_object_base &Fmt) {
-  // If we have more than a few bytes left in our output buffer, try
-  // formatting directly onto its end.
-  size_t NextBufferSize = 127;
-  size_t BufferBytesLeft = OutBufEnd - OutBufCur;
-  if (BufferBytesLeft > 3) {
-    size_t BytesUsed = Fmt.print(OutBufCur, BufferBytesLeft);
-
-    // Common case is that we have plenty of space.
-    if (BytesUsed <= BufferBytesLeft) {
-      OutBufCur += BytesUsed;
-      return *this;
-    }
-
-    // Otherwise, we overflowed and the return value tells us the size to try
-    // again with.
-    NextBufferSize = BytesUsed;
-  }
-
-  // If we got here, we didn't have enough space in the output buffer for the
-  // string.  Try printing into a SmallVector that is resized to have enough
-  // space.  Iterate until we win.
-  SmallVector<char, 128> V;
-
-  while (true) {
-    V.resize(NextBufferSize);
-
-    // Try formatting into the SmallVector.
-    size_t BytesUsed = Fmt.print(V.data(), NextBufferSize);
-
-    // If BytesUsed fit into the vector, we win.
-    if (BytesUsed <= NextBufferSize)
-      return write(V.data(), BytesUsed);
-
-    // Otherwise, try again with a new size.
-    assert(BytesUsed > NextBufferSize && "Didn't grow buffer!?");
-    NextBufferSize = BytesUsed;
-  }
-}
-
-raw_ostream &raw_ostream::operator<<(const formatv_object_base &Obj) {
-  Obj.format(*this);
-  return *this;
-}
-
-raw_ostream &raw_ostream::operator<<(const FormattedString &FS) {
-  unsigned LeftIndent = 0;
-  unsigned RightIndent = 0;
-  const ssize_t Difference = FS.Width - FS.Str.size();
-  if (Difference > 0) {
-    switch (FS.Justify) {
-    case FormattedString::JustifyNone:
-      break;
-    case FormattedString::JustifyLeft:
-      RightIndent = Difference;
-      break;
-    case FormattedString::JustifyRight:
-      LeftIndent = Difference;
-      break;
-    case FormattedString::JustifyCenter:
-      LeftIndent = Difference / 2;
-      RightIndent = Difference - LeftIndent;
-      break;
-    }
-  }
-  indent(LeftIndent);
-  (*this) << FS.Str;
-  indent(RightIndent);
-  return *this;
-}
-
-raw_ostream &raw_ostream::operator<<(const FormattedNumber &FN) {
-  if (FN.Hex) {
-    HexPrintStyle Style;
-    if (FN.Upper && FN.HexPrefix)
-      Style = HexPrintStyle::PrefixUpper;
-    else if (FN.Upper && !FN.HexPrefix)
-      Style = HexPrintStyle::Upper;
-    else if (!FN.Upper && FN.HexPrefix)
-      Style = HexPrintStyle::PrefixLower;
-    else
-      Style = HexPrintStyle::Lower;
-    llvm::write_hex(*this, FN.HexValue, Style, FN.Width);
-  } else {
-    llvm::SmallString<16> Buffer;
-    llvm::raw_svector_ostream Stream(Buffer);
-    llvm::write_integer(Stream, FN.DecValue, 0, IntegerStyle::Integer);
-    if (Buffer.size() < FN.Width)
-      indent(FN.Width - Buffer.size());
-    (*this) << Buffer;
-  }
-  return *this;
-}
-
-raw_ostream &raw_ostream::operator<<(const FormattedBytes &FB) {
-  if (FB.Bytes.empty())
-    return *this;
-
-  size_t LineIndex = 0;
-  auto Bytes = FB.Bytes;
-  const size_t Size = Bytes.size();
-  HexPrintStyle HPS = FB.Upper ? HexPrintStyle::Upper : HexPrintStyle::Lower;
-  uint64_t OffsetWidth = 0;
-  if (FB.FirstByteOffset) {
-    // Figure out how many nibbles are needed to print the largest offset
-    // represented by this data set, so that we can align the offset field
-    // to the right width.
-    size_t Lines = Size / FB.NumPerLine;
-    uint64_t MaxOffset = *FB.FirstByteOffset + Lines * FB.NumPerLine;
-    unsigned Power = 0;
-    if (MaxOffset > 0)
-      Power = llvm::Log2_64_Ceil(MaxOffset);
-    OffsetWidth = std::max<uint64_t>(4, llvm::alignTo(Power, 4) / 4);
-  }
-
-  // The width of a block of data including all spaces for group separators.
-  unsigned NumByteGroups =
-      alignTo(FB.NumPerLine, FB.ByteGroupSize) / FB.ByteGroupSize;
-  unsigned BlockCharWidth = FB.NumPerLine * 2 + NumByteGroups - 1;
-
-  while (!Bytes.empty()) {
-    indent(FB.IndentLevel);
-
-    if (FB.FirstByteOffset) {
-      uint64_t Offset = *FB.FirstByteOffset;
-      llvm::write_hex(*this, Offset + LineIndex, HPS, OffsetWidth);
-      *this << ": ";
-    }
-
-    auto Line = Bytes.take_front(FB.NumPerLine);
-
-    size_t CharsPrinted = 0;
-    // Print the hex bytes for this line in groups
-    for (size_t I = 0; I < Line.size(); ++I, CharsPrinted += 2) {
-      if (I && (I % FB.ByteGroupSize) == 0) {
-        ++CharsPrinted;
-        *this << " ";
-      }
-      llvm::write_hex(*this, Line[I], HPS, 2);
-    }
-
-    if (FB.ASCII) {
-      // Print any spaces needed for any bytes that we didn't print on this
-      // line so that the ASCII bytes are correctly aligned.
-      assert(BlockCharWidth >= CharsPrinted);
-      indent(BlockCharWidth - CharsPrinted + 2);
-      *this << "|";
-
-      // Print the ASCII char values for each byte on this line
-      for (uint8_t Byte : Line) {
-        if (isPrint(Byte))
-          *this << static_cast<char>(Byte);
-        else
-          *this << '.';
-      }
-      *this << '|';
-    }
-
-    Bytes = Bytes.drop_front(Line.size());
-    LineIndex += Line.size();
-    if (LineIndex < Size)
-      *this << '\n';
-  }
-  return *this;
-}
-
 template <char C>
 static raw_ostream &write_padding(raw_ostream &OS, unsigned NumChars) {
   static const char Chars[] = {C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C,
@@ -512,63 +301,8 @@ raw_ostream &raw_ostream::write_zeros(unsigned NumZeros) {
   return write_padding<'\0'>(*this, NumZeros);
 }
 
-bool raw_ostream::prepare_colors() {
-  // Colors were explicitly disabled.
-  if (!ColorEnabled)
-    return false;
-
-  // Colors require changing the terminal but this stream is not going to a
-  // terminal.
-  if (sys::Process::ColorNeedsFlush() && !is_displayed())
-    return false;
-
-  if (sys::Process::ColorNeedsFlush())
-    flush();
-
-  return true;
-}
-
-raw_ostream &raw_ostream::changeColor(enum Colors colors, bool bold, bool bg) {
-  if (!prepare_colors())
-    return *this;
-
-  const char *colorcode =
-      (colors == SAVEDCOLOR)
-          ? sys::Process::OutputBold(bg)
-          : sys::Process::OutputColor(static_cast<char>(colors), bold, bg);
-  if (colorcode)
-    write(colorcode, strlen(colorcode));
-  return *this;
-}
-
-raw_ostream &raw_ostream::resetColor() {
-  if (!prepare_colors())
-    return *this;
-
-  if (const char *colorcode = sys::Process::ResetColor())
-    write(colorcode, strlen(colorcode));
-  return *this;
-}
-
-raw_ostream &raw_ostream::reverseColor() {
-  if (!prepare_colors())
-    return *this;
-
-  if (const char *colorcode = sys::Process::OutputReverse())
-    write(colorcode, strlen(colorcode));
-  return *this;
-}
-
 void raw_ostream::anchor() {}
 
-//===----------------------------------------------------------------------===//
-//  Formatted Output
-//===----------------------------------------------------------------------===//
-
-// Out of line virtual method.
-void format_object_base::home() {
-}
-
 //===----------------------------------------------------------------------===//
 //  raw_fd_ostream
 //===----------------------------------------------------------------------===//
@@ -867,31 +601,6 @@ size_t raw_fd_ostream::preferred_buffer_size() const {
 #endif
 }
 
-bool raw_fd_ostream::is_displayed() const {
-  return sys::Process::FileDescriptorIsDisplayed(FD);
-}
-
-bool raw_fd_ostream::has_colors() const {
-  if (!HasColors)
-    HasColors = sys::Process::FileDescriptorHasColors(FD);
-  return *HasColors;
-}
-
-Expected<sys::fs::FileLocker> raw_fd_ostream::lock() {
-  std::error_code EC = sys::fs::lockFile(FD);
-  if (!EC)
-    return sys::fs::FileLocker(FD);
-  return errorCodeToError(EC);
-}
-
-Expected<sys::fs::FileLocker>
-raw_fd_ostream::tryLockFor(Duration const& Timeout) {
-  std::error_code EC = sys::fs::tryLockFile(FD, Timeout.getDuration());
-  if (!EC)
-    return sys::fs::FileLocker(FD);
-  return errorCodeToError(EC);
-}
-
 void raw_fd_ostream::anchor() {}
 
 //===----------------------------------------------------------------------===//
@@ -934,16 +643,6 @@ raw_fd_stream::raw_fd_stream(std::string_view Filename, std::error_code &EC)
     EC = std::make_error_code(std::errc::invalid_argument);
 }
 
-ssize_t raw_fd_stream::read(char *Ptr, size_t Size) {
-  assert(get_fd() >= 0 && "File already closed.");
-  ssize_t Ret = ::read(get_fd(), (void *)Ptr, Size);
-  if (Ret >= 0)
-    inc_pos(Ret);
-  else
-    error_detected(std::error_code(errno, std::generic_category()));
-  return Ret;
-}
-
 bool raw_fd_stream::classof(const raw_ostream *OS) {
   return OS->get_kind() == OStreamKind::OK_FDStream;
 }
@@ -999,31 +698,3 @@ void raw_pwrite_stream::anchor() {}
 void buffer_ostream::anchor() {}
 
 void buffer_unique_ostream::anchor() {}
-
-Error llvm::writeToOutput(std::string_view OutputFileName,
-                          std::function<Error(raw_ostream &)> Write) {
-  if (OutputFileName == "-")
-    return Write(outs());
-
-  if (OutputFileName == "/dev/null") {
-    raw_null_ostream Out;
-    return Write(Out);
-  }
-
-  unsigned Mode = sys::fs::all_read | sys::fs::all_write;
-  Expected<sys::fs::TempFile> Temp =
-      sys::fs::TempFile::create(OutputFileName + ".temp-stream-%%%%%%", Mode);
-  if (!Temp)
-    return createFileError(OutputFileName, Temp.takeError());
-
-  raw_fd_ostream Out(Temp->FD, false);
-
-  if (Error E = Write(Out)) {
-    if (Error DiscardError = Temp->discard())
-      return joinErrors(std::move(E), std::move(DiscardError));
-    return E;
-  }
-  Out.flush();
-
-  return Temp->keep(OutputFileName);
-}