Restoring authorship annotation for <[email protected]>. Commit 1 of 2.

1 files changed, 2135 insertions, 2135 deletions

diff --git a/contrib/libs/llvm12/include/llvm/Support/CommandLine.h b/contrib/libs/llvm12/include/llvm/Support/CommandLine.h
index df5b148c142..c4bcacccd32 100644
--- a/contrib/libs/llvm12/include/llvm/Support/CommandLine.h
+++ b/contrib/libs/llvm12/include/llvm/Support/CommandLine.h
@@ -1,389 +1,389 @@
-#pragma once
-
-#ifdef __GNUC__
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-parameter"
-#endif
-
-//===- llvm/Support/CommandLine.h - Command line handler --------*- 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 class implements a command line argument processor that is useful when
-// creating a tool.  It provides a simple, minimalistic interface that is easily
-// extensible and supports nonlocal (library) command line options.
-//
-// Note that rather than trying to figure out what this code does, you should
-// read the library documentation located in docs/CommandLine.html or looks at
-// the many example usages in tools/*/*.cpp
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_SUPPORT_COMMANDLINE_H
-#define LLVM_SUPPORT_COMMANDLINE_H
-
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/None.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/Twine.h"
-#include "llvm/ADT/iterator_range.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/VirtualFileSystem.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cassert>
-#include <climits>
-#include <cstddef>
-#include <functional>
-#include <initializer_list>
-#include <string>
-#include <type_traits>
-#include <vector>
-
-namespace llvm {
-
-class StringSaver;
-
-/// cl Namespace - This namespace contains all of the command line option
-/// processing machinery.  It is intentionally a short name to make qualified
-/// usage concise.
-namespace cl {
-
-//===----------------------------------------------------------------------===//
-// ParseCommandLineOptions - Command line option processing entry point.
-//
-// Returns true on success. Otherwise, this will print the error message to
-// stderr and exit if \p Errs is not set (nullptr by default), or print the
-// error message to \p Errs and return false if \p Errs is provided.
-//
-// If EnvVar is not nullptr, command-line options are also parsed from the
-// environment variable named by EnvVar.  Precedence is given to occurrences
-// from argv.  This precedence is currently implemented by parsing argv after
-// the environment variable, so it is only implemented correctly for options
-// that give precedence to later occurrences.  If your program supports options
-// that give precedence to earlier occurrences, you will need to extend this
-// function to support it correctly.
-bool ParseCommandLineOptions(int argc, const char *const *argv,
-                             StringRef Overview = "",
-                             raw_ostream *Errs = nullptr,
-                             const char *EnvVar = nullptr,
-                             bool LongOptionsUseDoubleDash = false);
-
-// Function pointer type for printing version information.
-using VersionPrinterTy = std::function<void(raw_ostream &)>;
-
-///===---------------------------------------------------------------------===//
-/// SetVersionPrinter - Override the default (LLVM specific) version printer
-///                     used to print out the version when --version is given
-///                     on the command line. This allows other systems using the
-///                     CommandLine utilities to print their own version string.
-void SetVersionPrinter(VersionPrinterTy func);
-
-///===---------------------------------------------------------------------===//
-/// AddExtraVersionPrinter - Add an extra printer to use in addition to the
-///                          default one. This can be called multiple times,
-///                          and each time it adds a new function to the list
-///                          which will be called after the basic LLVM version
-///                          printing is complete. Each can then add additional
-///                          information specific to the tool.
-void AddExtraVersionPrinter(VersionPrinterTy func);
-
-// PrintOptionValues - Print option values.
-// With -print-options print the difference between option values and defaults.
-// With -print-all-options print all option values.
-// (Currently not perfect, but best-effort.)
-void PrintOptionValues();
-
-// Forward declaration - AddLiteralOption needs to be up here to make gcc happy.
-class Option;
-
-/// Adds a new option for parsing and provides the option it refers to.
-///
-/// \param O pointer to the option
-/// \param Name the string name for the option to handle during parsing
-///
-/// Literal options are used by some parsers to register special option values.
-/// This is how the PassNameParser registers pass names for opt.
-void AddLiteralOption(Option &O, StringRef Name);
-
-//===----------------------------------------------------------------------===//
-// Flags permitted to be passed to command line arguments
-//
-
-enum NumOccurrencesFlag { // Flags for the number of occurrences allowed
-  Optional = 0x00,        // Zero or One occurrence
-  ZeroOrMore = 0x01,      // Zero or more occurrences allowed
-  Required = 0x02,        // One occurrence required
-  OneOrMore = 0x03,       // One or more occurrences required
-
-  // ConsumeAfter - Indicates that this option is fed anything that follows the
-  // last positional argument required by the application (it is an error if
-  // there are zero positional arguments, and a ConsumeAfter option is used).
-  // Thus, for example, all arguments to LLI are processed until a filename is
-  // found.  Once a filename is found, all of the succeeding arguments are
-  // passed, unprocessed, to the ConsumeAfter option.
-  //
-  ConsumeAfter = 0x04
-};
-
-enum ValueExpected { // Is a value required for the option?
-  // zero reserved for the unspecified value
-  ValueOptional = 0x01,  // The value can appear... or not
-  ValueRequired = 0x02,  // The value is required to appear!
-  ValueDisallowed = 0x03 // A value may not be specified (for flags)
-};
-
-enum OptionHidden {   // Control whether -help shows this option
-  NotHidden = 0x00,   // Option included in -help & -help-hidden
-  Hidden = 0x01,      // -help doesn't, but -help-hidden does
-  ReallyHidden = 0x02 // Neither -help nor -help-hidden show this arg
-};
-
-// Formatting flags - This controls special features that the option might have
-// that cause it to be parsed differently...
-//
-// Prefix - This option allows arguments that are otherwise unrecognized to be
-// matched by options that are a prefix of the actual value.  This is useful for
-// cases like a linker, where options are typically of the form '-lfoo' or
-// '-L../../include' where -l or -L are the actual flags.  When prefix is
-// enabled, and used, the value for the flag comes from the suffix of the
-// argument.
-//
-// AlwaysPrefix - Only allow the behavior enabled by the Prefix flag and reject
-// the Option=Value form.
-//
-
-enum FormattingFlags {
-  NormalFormatting = 0x00, // Nothing special
-  Positional = 0x01,       // Is a positional argument, no '-' required
-  Prefix = 0x02,           // Can this option directly prefix its value?
-  AlwaysPrefix = 0x03      // Can this option only directly prefix its value?
-};
-
-enum MiscFlags {             // Miscellaneous flags to adjust argument
-  CommaSeparated = 0x01,     // Should this cl::list split between commas?
-  PositionalEatsArgs = 0x02, // Should this positional cl::list eat -args?
-  Sink = 0x04,               // Should this cl::list eat all unknown options?
-
-  // Grouping - Can this option group with other options?
-  // If this is enabled, multiple letter options are allowed to bunch together
-  // with only a single hyphen for the whole group.  This allows emulation
-  // of the behavior that ls uses for example: ls -la === ls -l -a
-  Grouping = 0x08,
-
-  // Default option
-  DefaultOption = 0x10
-};
-
-//===----------------------------------------------------------------------===//
-// Option Category class
-//
-class OptionCategory {
-private:
-  StringRef const Name;
-  StringRef const Description;
-
-  void registerCategory();
-
-public:
-  OptionCategory(StringRef const Name,
-                 StringRef const Description = "")
-      : Name(Name), Description(Description) {
-    registerCategory();
-  }
-
-  StringRef getName() const { return Name; }
-  StringRef getDescription() const { return Description; }
-};
-
-// The general Option Category (used as default category).
-extern OptionCategory GeneralCategory;
-
-//===----------------------------------------------------------------------===//
-// SubCommand class
-//
-class SubCommand {
-private:
-  StringRef Name;
-  StringRef Description;
-
-protected:
-  void registerSubCommand();
-  void unregisterSubCommand();
-
-public:
-  SubCommand(StringRef Name, StringRef Description = "")
-      : Name(Name), Description(Description) {
-        registerSubCommand();
-  }
-  SubCommand() = default;
-
-  void reset();
-
-  explicit operator bool() const;
-
-  StringRef getName() const { return Name; }
-  StringRef getDescription() const { return Description; }
-
-  SmallVector<Option *, 4> PositionalOpts;
-  SmallVector<Option *, 4> SinkOpts;
-  StringMap<Option *> OptionsMap;
-
-  Option *ConsumeAfterOpt = nullptr; // The ConsumeAfter option if it exists.
-};
-
-// A special subcommand representing no subcommand
-extern ManagedStatic<SubCommand> TopLevelSubCommand;
-
-// A special subcommand that can be used to put an option into all subcommands.
-extern ManagedStatic<SubCommand> AllSubCommands;
-
-//===----------------------------------------------------------------------===//
-// Option Base class
-//
-class Option {
-  friend class alias;
-
-  // handleOccurrences - Overriden by subclasses to handle the value passed into
-  // an argument.  Should return true if there was an error processing the
-  // argument and the program should exit.
-  //
-  virtual bool handleOccurrence(unsigned pos, StringRef ArgName,
-                                StringRef Arg) = 0;
-
-  virtual enum ValueExpected getValueExpectedFlagDefault() const {
-    return ValueOptional;
-  }
-
-  // Out of line virtual function to provide home for the class.
-  virtual void anchor();
-
-  uint16_t NumOccurrences; // The number of times specified
-  // Occurrences, HiddenFlag, and Formatting are all enum types but to avoid
-  // problems with signed enums in bitfields.
-  uint16_t Occurrences : 3; // enum NumOccurrencesFlag
-  // not using the enum type for 'Value' because zero is an implementation
-  // detail representing the non-value
-  uint16_t Value : 2;
-  uint16_t HiddenFlag : 2; // enum OptionHidden
-  uint16_t Formatting : 2; // enum FormattingFlags
-  uint16_t Misc : 5;
-  uint16_t FullyInitialized : 1; // Has addArgument been called?
-  uint16_t Position;             // Position of last occurrence of the option
-  uint16_t AdditionalVals;       // Greater than 0 for multi-valued option.
-
-public:
-  StringRef ArgStr;   // The argument string itself (ex: "help", "o")
-  StringRef HelpStr;  // The descriptive text message for -help
-  StringRef ValueStr; // String describing what the value of this option is
-  SmallVector<OptionCategory *, 1>
-      Categories;                    // The Categories this option belongs to
-  SmallPtrSet<SubCommand *, 1> Subs; // The subcommands this option belongs to.
-
-  inline enum NumOccurrencesFlag getNumOccurrencesFlag() const {
-    return (enum NumOccurrencesFlag)Occurrences;
-  }
-
-  inline enum ValueExpected getValueExpectedFlag() const {
-    return Value ? ((enum ValueExpected)Value) : getValueExpectedFlagDefault();
-  }
-
-  inline enum OptionHidden getOptionHiddenFlag() const {
-    return (enum OptionHidden)HiddenFlag;
-  }
-
-  inline enum FormattingFlags getFormattingFlag() const {
-    return (enum FormattingFlags)Formatting;
-  }
-
-  inline unsigned getMiscFlags() const { return Misc; }
-  inline unsigned getPosition() const { return Position; }
-  inline unsigned getNumAdditionalVals() const { return AdditionalVals; }
-
-  // hasArgStr - Return true if the argstr != ""
-  bool hasArgStr() const { return !ArgStr.empty(); }
-  bool isPositional() const { return getFormattingFlag() == cl::Positional; }
-  bool isSink() const { return getMiscFlags() & cl::Sink; }
-  bool isDefaultOption() const { return getMiscFlags() & cl::DefaultOption; }
-
-  bool isConsumeAfter() const {
-    return getNumOccurrencesFlag() == cl::ConsumeAfter;
-  }
-
-  bool isInAllSubCommands() const {
-    return any_of(Subs, [](const SubCommand *SC) {
-      return SC == &*AllSubCommands;
-    });
-  }
-
-  //-------------------------------------------------------------------------===
-  // Accessor functions set by OptionModifiers
-  //
-  void setArgStr(StringRef S);
-  void setDescription(StringRef S) { HelpStr = S; }
-  void setValueStr(StringRef S) { ValueStr = S; }
-  void setNumOccurrencesFlag(enum NumOccurrencesFlag Val) { Occurrences = Val; }
-  void setValueExpectedFlag(enum ValueExpected Val) { Value = Val; }
-  void setHiddenFlag(enum OptionHidden Val) { HiddenFlag = Val; }
-  void setFormattingFlag(enum FormattingFlags V) { Formatting = V; }
-  void setMiscFlag(enum MiscFlags M) { Misc |= M; }
-  void setPosition(unsigned pos) { Position = pos; }
-  void addCategory(OptionCategory &C);
-  void addSubCommand(SubCommand &S) { Subs.insert(&S); }
-
-protected:
-  explicit Option(enum NumOccurrencesFlag OccurrencesFlag,
-                  enum OptionHidden Hidden)
-      : NumOccurrences(0), Occurrences(OccurrencesFlag), Value(0),
-        HiddenFlag(Hidden), Formatting(NormalFormatting), Misc(0),
-        FullyInitialized(false), Position(0), AdditionalVals(0) {
-    Categories.push_back(&GeneralCategory);
-  }
-
-  inline void setNumAdditionalVals(unsigned n) { AdditionalVals = n; }
-
-public:
-  virtual ~Option() = default;
-
-  // addArgument - Register this argument with the commandline system.
-  //
-  void addArgument();
-
-  /// Unregisters this option from the CommandLine system.
-  ///
-  /// This option must have been the last option registered.
-  /// For testing purposes only.
-  void removeArgument();
-
-  // Return the width of the option tag for printing...
-  virtual size_t getOptionWidth() const = 0;
-
-  // printOptionInfo - Print out information about this option.  The
-  // to-be-maintained width is specified.
-  //
-  virtual void printOptionInfo(size_t GlobalWidth) const = 0;
-
-  virtual void printOptionValue(size_t GlobalWidth, bool Force) const = 0;
-
-  virtual void setDefault() = 0;
-
+#pragma once 
+ 
+#ifdef __GNUC__ 
+#pragma GCC diagnostic push 
+#pragma GCC diagnostic ignored "-Wunused-parameter" 
+#endif 
+ 
+//===- llvm/Support/CommandLine.h - Command line handler --------*- 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 class implements a command line argument processor that is useful when 
+// creating a tool.  It provides a simple, minimalistic interface that is easily 
+// extensible and supports nonlocal (library) command line options. 
+// 
+// Note that rather than trying to figure out what this code does, you should 
+// read the library documentation located in docs/CommandLine.html or looks at 
+// the many example usages in tools/*/*.cpp 
+// 
+//===----------------------------------------------------------------------===// 
+ 
+#ifndef LLVM_SUPPORT_COMMANDLINE_H 
+#define LLVM_SUPPORT_COMMANDLINE_H 
+ 
+#include "llvm/ADT/ArrayRef.h" 
+#include "llvm/ADT/None.h" 
+#include "llvm/ADT/Optional.h" 
+#include "llvm/ADT/STLExtras.h" 
+#include "llvm/ADT/SmallPtrSet.h" 
+#include "llvm/ADT/SmallVector.h" 
+#include "llvm/ADT/StringMap.h" 
+#include "llvm/ADT/StringRef.h" 
+#include "llvm/ADT/Twine.h" 
+#include "llvm/ADT/iterator_range.h" 
+#include "llvm/Support/ErrorHandling.h" 
+#include "llvm/Support/ManagedStatic.h" 
+#include "llvm/Support/VirtualFileSystem.h" 
+#include "llvm/Support/raw_ostream.h" 
+#include <cassert> 
+#include <climits> 
+#include <cstddef> 
+#include <functional> 
+#include <initializer_list> 
+#include <string> 
+#include <type_traits> 
+#include <vector> 
+ 
+namespace llvm { 
+ 
+class StringSaver; 
+ 
+/// cl Namespace - This namespace contains all of the command line option 
+/// processing machinery.  It is intentionally a short name to make qualified 
+/// usage concise. 
+namespace cl { 
+ 
+//===----------------------------------------------------------------------===// 
+// ParseCommandLineOptions - Command line option processing entry point. 
+// 
+// Returns true on success. Otherwise, this will print the error message to 
+// stderr and exit if \p Errs is not set (nullptr by default), or print the 
+// error message to \p Errs and return false if \p Errs is provided. 
+// 
+// If EnvVar is not nullptr, command-line options are also parsed from the 
+// environment variable named by EnvVar.  Precedence is given to occurrences 
+// from argv.  This precedence is currently implemented by parsing argv after 
+// the environment variable, so it is only implemented correctly for options 
+// that give precedence to later occurrences.  If your program supports options 
+// that give precedence to earlier occurrences, you will need to extend this 
+// function to support it correctly. 
+bool ParseCommandLineOptions(int argc, const char *const *argv, 
+                             StringRef Overview = "", 
+                             raw_ostream *Errs = nullptr, 
+                             const char *EnvVar = nullptr, 
+                             bool LongOptionsUseDoubleDash = false); 
+ 
+// Function pointer type for printing version information. 
+using VersionPrinterTy = std::function<void(raw_ostream &)>; 
+ 
+///===---------------------------------------------------------------------===// 
+/// SetVersionPrinter - Override the default (LLVM specific) version printer 
+///                     used to print out the version when --version is given 
+///                     on the command line. This allows other systems using the 
+///                     CommandLine utilities to print their own version string. 
+void SetVersionPrinter(VersionPrinterTy func); 
+ 
+///===---------------------------------------------------------------------===// 
+/// AddExtraVersionPrinter - Add an extra printer to use in addition to the 
+///                          default one. This can be called multiple times, 
+///                          and each time it adds a new function to the list 
+///                          which will be called after the basic LLVM version 
+///                          printing is complete. Each can then add additional 
+///                          information specific to the tool. 
+void AddExtraVersionPrinter(VersionPrinterTy func); 
+ 
+// PrintOptionValues - Print option values. 
+// With -print-options print the difference between option values and defaults. 
+// With -print-all-options print all option values. 
+// (Currently not perfect, but best-effort.) 
+void PrintOptionValues(); 
+ 
+// Forward declaration - AddLiteralOption needs to be up here to make gcc happy. 
+class Option; 
+ 
+/// Adds a new option for parsing and provides the option it refers to. 
+/// 
+/// \param O pointer to the option 
+/// \param Name the string name for the option to handle during parsing 
+/// 
+/// Literal options are used by some parsers to register special option values. 
+/// This is how the PassNameParser registers pass names for opt. 
+void AddLiteralOption(Option &O, StringRef Name); 
+ 
+//===----------------------------------------------------------------------===// 
+// Flags permitted to be passed to command line arguments 
+// 
+ 
+enum NumOccurrencesFlag { // Flags for the number of occurrences allowed 
+  Optional = 0x00,        // Zero or One occurrence 
+  ZeroOrMore = 0x01,      // Zero or more occurrences allowed 
+  Required = 0x02,        // One occurrence required 
+  OneOrMore = 0x03,       // One or more occurrences required 
+ 
+  // ConsumeAfter - Indicates that this option is fed anything that follows the 
+  // last positional argument required by the application (it is an error if 
+  // there are zero positional arguments, and a ConsumeAfter option is used). 
+  // Thus, for example, all arguments to LLI are processed until a filename is 
+  // found.  Once a filename is found, all of the succeeding arguments are 
+  // passed, unprocessed, to the ConsumeAfter option. 
+  // 
+  ConsumeAfter = 0x04 
+}; 
+ 
+enum ValueExpected { // Is a value required for the option? 
+  // zero reserved for the unspecified value 
+  ValueOptional = 0x01,  // The value can appear... or not 
+  ValueRequired = 0x02,  // The value is required to appear! 
+  ValueDisallowed = 0x03 // A value may not be specified (for flags) 
+}; 
+ 
+enum OptionHidden {   // Control whether -help shows this option 
+  NotHidden = 0x00,   // Option included in -help & -help-hidden 
+  Hidden = 0x01,      // -help doesn't, but -help-hidden does 
+  ReallyHidden = 0x02 // Neither -help nor -help-hidden show this arg 
+}; 
+ 
+// Formatting flags - This controls special features that the option might have 
+// that cause it to be parsed differently... 
+// 
+// Prefix - This option allows arguments that are otherwise unrecognized to be 
+// matched by options that are a prefix of the actual value.  This is useful for 
+// cases like a linker, where options are typically of the form '-lfoo' or 
+// '-L../../include' where -l or -L are the actual flags.  When prefix is 
+// enabled, and used, the value for the flag comes from the suffix of the 
+// argument. 
+// 
+// AlwaysPrefix - Only allow the behavior enabled by the Prefix flag and reject 
+// the Option=Value form. 
+// 
+ 
+enum FormattingFlags { 
+  NormalFormatting = 0x00, // Nothing special 
+  Positional = 0x01,       // Is a positional argument, no '-' required 
+  Prefix = 0x02,           // Can this option directly prefix its value? 
+  AlwaysPrefix = 0x03      // Can this option only directly prefix its value? 
+}; 
+ 
+enum MiscFlags {             // Miscellaneous flags to adjust argument 
+  CommaSeparated = 0x01,     // Should this cl::list split between commas? 
+  PositionalEatsArgs = 0x02, // Should this positional cl::list eat -args? 
+  Sink = 0x04,               // Should this cl::list eat all unknown options? 
+ 
+  // Grouping - Can this option group with other options? 
+  // If this is enabled, multiple letter options are allowed to bunch together 
+  // with only a single hyphen for the whole group.  This allows emulation 
+  // of the behavior that ls uses for example: ls -la === ls -l -a 
+  Grouping = 0x08, 
+ 
+  // Default option 
+  DefaultOption = 0x10 
+}; 
+ 
+//===----------------------------------------------------------------------===// 
+// Option Category class 
+// 
+class OptionCategory { 
+private: 
+  StringRef const Name; 
+  StringRef const Description; 
+ 
+  void registerCategory(); 
+ 
+public: 
+  OptionCategory(StringRef const Name, 
+                 StringRef const Description = "") 
+      : Name(Name), Description(Description) { 
+    registerCategory(); 
+  } 
+ 
+  StringRef getName() const { return Name; } 
+  StringRef getDescription() const { return Description; } 
+}; 
+ 
+// The general Option Category (used as default category). 
+extern OptionCategory GeneralCategory; 
+ 
+//===----------------------------------------------------------------------===// 
+// SubCommand class 
+// 
+class SubCommand { 
+private: 
+  StringRef Name; 
+  StringRef Description; 
+ 
+protected: 
+  void registerSubCommand(); 
+  void unregisterSubCommand(); 
+ 
+public: 
+  SubCommand(StringRef Name, StringRef Description = "") 
+      : Name(Name), Description(Description) { 
+        registerSubCommand(); 
+  } 
+  SubCommand() = default; 
+ 
+  void reset(); 
+ 
+  explicit operator bool() const; 
+ 
+  StringRef getName() const { return Name; } 
+  StringRef getDescription() const { return Description; } 
+ 
+  SmallVector<Option *, 4> PositionalOpts; 
+  SmallVector<Option *, 4> SinkOpts; 
+  StringMap<Option *> OptionsMap; 
+ 
+  Option *ConsumeAfterOpt = nullptr; // The ConsumeAfter option if it exists. 
+}; 
+ 
+// A special subcommand representing no subcommand 
+extern ManagedStatic<SubCommand> TopLevelSubCommand; 
+ 
+// A special subcommand that can be used to put an option into all subcommands. 
+extern ManagedStatic<SubCommand> AllSubCommands; 
+ 
+//===----------------------------------------------------------------------===// 
+// Option Base class 
+// 
+class Option { 
+  friend class alias; 
+ 
+  // handleOccurrences - Overriden by subclasses to handle the value passed into 
+  // an argument.  Should return true if there was an error processing the 
+  // argument and the program should exit. 
+  // 
+  virtual bool handleOccurrence(unsigned pos, StringRef ArgName, 
+                                StringRef Arg) = 0; 
+ 
+  virtual enum ValueExpected getValueExpectedFlagDefault() const { 
+    return ValueOptional; 
+  } 
+ 
+  // Out of line virtual function to provide home for the class. 
+  virtual void anchor(); 
+ 
+  uint16_t NumOccurrences; // The number of times specified 
+  // Occurrences, HiddenFlag, and Formatting are all enum types but to avoid 
+  // problems with signed enums in bitfields. 
+  uint16_t Occurrences : 3; // enum NumOccurrencesFlag 
+  // not using the enum type for 'Value' because zero is an implementation 
+  // detail representing the non-value 
+  uint16_t Value : 2; 
+  uint16_t HiddenFlag : 2; // enum OptionHidden 
+  uint16_t Formatting : 2; // enum FormattingFlags 
+  uint16_t Misc : 5; 
+  uint16_t FullyInitialized : 1; // Has addArgument been called? 
+  uint16_t Position;             // Position of last occurrence of the option 
+  uint16_t AdditionalVals;       // Greater than 0 for multi-valued option. 
+ 
+public: 
+  StringRef ArgStr;   // The argument string itself (ex: "help", "o") 
+  StringRef HelpStr;  // The descriptive text message for -help 
+  StringRef ValueStr; // String describing what the value of this option is 
+  SmallVector<OptionCategory *, 1> 
+      Categories;                    // The Categories this option belongs to 
+  SmallPtrSet<SubCommand *, 1> Subs; // The subcommands this option belongs to. 
+ 
+  inline enum NumOccurrencesFlag getNumOccurrencesFlag() const { 
+    return (enum NumOccurrencesFlag)Occurrences; 
+  } 
+ 
+  inline enum ValueExpected getValueExpectedFlag() const { 
+    return Value ? ((enum ValueExpected)Value) : getValueExpectedFlagDefault(); 
+  } 
+ 
+  inline enum OptionHidden getOptionHiddenFlag() const { 
+    return (enum OptionHidden)HiddenFlag; 
+  } 
+ 
+  inline enum FormattingFlags getFormattingFlag() const { 
+    return (enum FormattingFlags)Formatting; 
+  } 
+ 
+  inline unsigned getMiscFlags() const { return Misc; } 
+  inline unsigned getPosition() const { return Position; } 
+  inline unsigned getNumAdditionalVals() const { return AdditionalVals; } 
+ 
+  // hasArgStr - Return true if the argstr != "" 
+  bool hasArgStr() const { return !ArgStr.empty(); } 
+  bool isPositional() const { return getFormattingFlag() == cl::Positional; } 
+  bool isSink() const { return getMiscFlags() & cl::Sink; } 
+  bool isDefaultOption() const { return getMiscFlags() & cl::DefaultOption; } 
+ 
+  bool isConsumeAfter() const { 
+    return getNumOccurrencesFlag() == cl::ConsumeAfter; 
+  } 
+ 
+  bool isInAllSubCommands() const { 
+    return any_of(Subs, [](const SubCommand *SC) { 
+      return SC == &*AllSubCommands; 
+    }); 
+  } 
+ 
+  //-------------------------------------------------------------------------=== 
+  // Accessor functions set by OptionModifiers 
+  // 
+  void setArgStr(StringRef S); 
+  void setDescription(StringRef S) { HelpStr = S; } 
+  void setValueStr(StringRef S) { ValueStr = S; } 
+  void setNumOccurrencesFlag(enum NumOccurrencesFlag Val) { Occurrences = Val; } 
+  void setValueExpectedFlag(enum ValueExpected Val) { Value = Val; } 
+  void setHiddenFlag(enum OptionHidden Val) { HiddenFlag = Val; } 
+  void setFormattingFlag(enum FormattingFlags V) { Formatting = V; } 
+  void setMiscFlag(enum MiscFlags M) { Misc |= M; } 
+  void setPosition(unsigned pos) { Position = pos; } 
+  void addCategory(OptionCategory &C); 
+  void addSubCommand(SubCommand &S) { Subs.insert(&S); } 
+ 
+protected: 
+  explicit Option(enum NumOccurrencesFlag OccurrencesFlag, 
+                  enum OptionHidden Hidden) 
+      : NumOccurrences(0), Occurrences(OccurrencesFlag), Value(0), 
+        HiddenFlag(Hidden), Formatting(NormalFormatting), Misc(0), 
+        FullyInitialized(false), Position(0), AdditionalVals(0) { 
+    Categories.push_back(&GeneralCategory); 
+  } 
+ 
+  inline void setNumAdditionalVals(unsigned n) { AdditionalVals = n; } 
+ 
+public: 
+  virtual ~Option() = default; 
+ 
+  // addArgument - Register this argument with the commandline system. 
+  // 
+  void addArgument(); 
+ 
+  /// Unregisters this option from the CommandLine system. 
+  /// 
+  /// This option must have been the last option registered. 
+  /// For testing purposes only. 
+  void removeArgument(); 
+ 
+  // Return the width of the option tag for printing... 
+  virtual size_t getOptionWidth() const = 0; 
+ 
+  // printOptionInfo - Print out information about this option.  The 
+  // to-be-maintained width is specified. 
+  // 
+  virtual void printOptionInfo(size_t GlobalWidth) const = 0; 
+ 
+  virtual void printOptionValue(size_t GlobalWidth, bool Force) const = 0; 
+ 
+  virtual void setDefault() = 0; 
+ 
   // Prints the help string for an option.
   //
   // This maintains the Indent for multi-line descriptions.
   // FirstLineIndentedBy is the count of chars of the first line
   //      i.e. the one containing the --<option name>.
-  static void printHelpStr(StringRef HelpStr, size_t Indent,
-                           size_t FirstLineIndentedBy);
-
+  static void printHelpStr(StringRef HelpStr, size_t Indent, 
+                           size_t FirstLineIndentedBy); 
+ 
   // Prints the help string for an enum value.
   //
   // This maintains the Indent for multi-line descriptions.
@@ -392,1719 +392,1719 @@ public:
   static void printEnumValHelpStr(StringRef HelpStr, size_t Indent,
                                   size_t FirstLineIndentedBy);
 
-  virtual void getExtraOptionNames(SmallVectorImpl<StringRef> &) {}
-
-  // addOccurrence - Wrapper around handleOccurrence that enforces Flags.
-  //
-  virtual bool addOccurrence(unsigned pos, StringRef ArgName, StringRef Value,
-                             bool MultiArg = false);
-
-  // Prints option name followed by message.  Always returns true.
-  bool error(const Twine &Message, StringRef ArgName = StringRef(), raw_ostream &Errs = llvm::errs());
-  bool error(const Twine &Message, raw_ostream &Errs) {
-    return error(Message, StringRef(), Errs);
-  }
-
-  inline int getNumOccurrences() const { return NumOccurrences; }
-  void reset();
-};
-
-//===----------------------------------------------------------------------===//
-// Command line option modifiers that can be used to modify the behavior of
-// command line option parsers...
-//
-
-// desc - Modifier to set the description shown in the -help output...
-struct desc {
-  StringRef Desc;
-
-  desc(StringRef Str) : Desc(Str) {}
-
-  void apply(Option &O) const { O.setDescription(Desc); }
-};
-
-// value_desc - Modifier to set the value description shown in the -help
-// output...
-struct value_desc {
-  StringRef Desc;
-
-  value_desc(StringRef Str) : Desc(Str) {}
-
-  void apply(Option &O) const { O.setValueStr(Desc); }
-};
-
-// init - Specify a default (initial) value for the command line argument, if
-// the default constructor for the argument type does not give you what you
-// want.  This is only valid on "opt" arguments, not on "list" arguments.
-//
-template <class Ty> struct initializer {
-  const Ty &Init;
-  initializer(const Ty &Val) : Init(Val) {}
-
-  template <class Opt> void apply(Opt &O) const { O.setInitialValue(Init); }
-};
-
-template <class Ty> initializer<Ty> init(const Ty &Val) {
-  return initializer<Ty>(Val);
-}
-
-// location - Allow the user to specify which external variable they want to
-// store the results of the command line argument processing into, if they don't
-// want to store it in the option itself.
-//
-template <class Ty> struct LocationClass {
-  Ty &Loc;
-
-  LocationClass(Ty &L) : Loc(L) {}
-
-  template <class Opt> void apply(Opt &O) const { O.setLocation(O, Loc); }
-};
-
-template <class Ty> LocationClass<Ty> location(Ty &L) {
-  return LocationClass<Ty>(L);
-}
-
-// cat - Specifiy the Option category for the command line argument to belong
-// to.
-struct cat {
-  OptionCategory &Category;
-
-  cat(OptionCategory &c) : Category(c) {}
-
-  template <class Opt> void apply(Opt &O) const { O.addCategory(Category); }
-};
-
-// sub - Specify the subcommand that this option belongs to.
-struct sub {
-  SubCommand &Sub;
-
-  sub(SubCommand &S) : Sub(S) {}
-
-  template <class Opt> void apply(Opt &O) const { O.addSubCommand(Sub); }
-};
-
-// Specify a callback function to be called when an option is seen.
-// Can be used to set other options automatically.
-template <typename R, typename Ty> struct cb {
-  std::function<R(Ty)> CB;
-
-  cb(std::function<R(Ty)> CB) : CB(CB) {}
-
-  template <typename Opt> void apply(Opt &O) const { O.setCallback(CB); }
-};
-
-namespace detail {
-template <typename F>
-struct callback_traits : public callback_traits<decltype(&F::operator())> {};
-
-template <typename R, typename C, typename... Args>
-struct callback_traits<R (C::*)(Args...) const> {
-  using result_type = R;
-  using arg_type = std::tuple_element_t<0, std::tuple<Args...>>;
-  static_assert(sizeof...(Args) == 1, "callback function must have one and only one parameter");
-  static_assert(std::is_same<result_type, void>::value,
-                "callback return type must be void");
-  static_assert(std::is_lvalue_reference<arg_type>::value &&
-                    std::is_const<std::remove_reference_t<arg_type>>::value,
-                "callback arg_type must be a const lvalue reference");
-};
-} // namespace detail
-
-template <typename F>
-cb<typename detail::callback_traits<F>::result_type,
-   typename detail::callback_traits<F>::arg_type>
-callback(F CB) {
-  using result_type = typename detail::callback_traits<F>::result_type;
-  using arg_type = typename detail::callback_traits<F>::arg_type;
-  return cb<result_type, arg_type>(CB);
-}
-
-//===----------------------------------------------------------------------===//
-// OptionValue class
-
-// Support value comparison outside the template.
-struct GenericOptionValue {
-  virtual bool compare(const GenericOptionValue &V) const = 0;
-
-protected:
-  GenericOptionValue() = default;
-  GenericOptionValue(const GenericOptionValue&) = default;
-  GenericOptionValue &operator=(const GenericOptionValue &) = default;
-  ~GenericOptionValue() = default;
-
-private:
-  virtual void anchor();
-};
-
-template <class DataType> struct OptionValue;
-
-// The default value safely does nothing. Option value printing is only
-// best-effort.
-template <class DataType, bool isClass>
-struct OptionValueBase : public GenericOptionValue {
-  // Temporary storage for argument passing.
-  using WrapperType = OptionValue<DataType>;
-
-  bool hasValue() const { return false; }
-
-  const DataType &getValue() const { llvm_unreachable("no default value"); }
-
-  // Some options may take their value from a different data type.
-  template <class DT> void setValue(const DT & /*V*/) {}
-
-  bool compare(const DataType & /*V*/) const { return false; }
-
-  bool compare(const GenericOptionValue & /*V*/) const override {
-    return false;
-  }
-
-protected:
-  ~OptionValueBase() = default;
-};
-
-// Simple copy of the option value.
-template <class DataType> class OptionValueCopy : public GenericOptionValue {
-  DataType Value;
-  bool Valid = false;
-
-protected:
-  OptionValueCopy(const OptionValueCopy&) = default;
-  OptionValueCopy &operator=(const OptionValueCopy &) = default;
-  ~OptionValueCopy() = default;
-
-public:
-  OptionValueCopy() = default;
-
-  bool hasValue() const { return Valid; }
-
-  const DataType &getValue() const {
-    assert(Valid && "invalid option value");
-    return Value;
-  }
-
-  void setValue(const DataType &V) {
-    Valid = true;
-    Value = V;
-  }
-
-  bool compare(const DataType &V) const { return Valid && (Value != V); }
-
-  bool compare(const GenericOptionValue &V) const override {
-    const OptionValueCopy<DataType> &VC =
-        static_cast<const OptionValueCopy<DataType> &>(V);
-    if (!VC.hasValue())
-      return false;
-    return compare(VC.getValue());
-  }
-};
-
-// Non-class option values.
-template <class DataType>
-struct OptionValueBase<DataType, false> : OptionValueCopy<DataType> {
-  using WrapperType = DataType;
-
-protected:
-  OptionValueBase() = default;
-  OptionValueBase(const OptionValueBase&) = default;
-  OptionValueBase &operator=(const OptionValueBase &) = default;
-  ~OptionValueBase() = default;
-};
-
-// Top-level option class.
-template <class DataType>
-struct OptionValue final
-    : OptionValueBase<DataType, std::is_class<DataType>::value> {
-  OptionValue() = default;
-
-  OptionValue(const DataType &V) { this->setValue(V); }
-
-  // Some options may take their value from a different data type.
-  template <class DT> OptionValue<DataType> &operator=(const DT &V) {
-    this->setValue(V);
-    return *this;
-  }
-};
-
-// Other safe-to-copy-by-value common option types.
-enum boolOrDefault { BOU_UNSET, BOU_TRUE, BOU_FALSE };
-template <>
-struct OptionValue<cl::boolOrDefault> final
-    : OptionValueCopy<cl::boolOrDefault> {
-  using WrapperType = cl::boolOrDefault;
-
-  OptionValue() = default;
-
-  OptionValue(const cl::boolOrDefault &V) { this->setValue(V); }
-
-  OptionValue<cl::boolOrDefault> &operator=(const cl::boolOrDefault &V) {
-    setValue(V);
-    return *this;
-  }
-
-private:
-  void anchor() override;
-};
-
-template <>
-struct OptionValue<std::string> final : OptionValueCopy<std::string> {
-  using WrapperType = StringRef;
-
-  OptionValue() = default;
-
-  OptionValue(const std::string &V) { this->setValue(V); }
-
-  OptionValue<std::string> &operator=(const std::string &V) {
-    setValue(V);
-    return *this;
-  }
-
-private:
-  void anchor() override;
-};
-
-//===----------------------------------------------------------------------===//
-// Enum valued command line option
-//
-
-// This represents a single enum value, using "int" as the underlying type.
-struct OptionEnumValue {
-  StringRef Name;
-  int Value;
-  StringRef Description;
-};
-
-#define clEnumVal(ENUMVAL, DESC)                                               \
-  llvm::cl::OptionEnumValue { #ENUMVAL, int(ENUMVAL), DESC }
-#define clEnumValN(ENUMVAL, FLAGNAME, DESC)                                    \
-  llvm::cl::OptionEnumValue { FLAGNAME, int(ENUMVAL), DESC }
-
-// values - For custom data types, allow specifying a group of values together
-// as the values that go into the mapping that the option handler uses.
-//
-class ValuesClass {
-  // Use a vector instead of a map, because the lists should be short,
-  // the overhead is less, and most importantly, it keeps them in the order
-  // inserted so we can print our option out nicely.
-  SmallVector<OptionEnumValue, 4> Values;
-
-public:
-  ValuesClass(std::initializer_list<OptionEnumValue> Options)
-      : Values(Options) {}
-
-  template <class Opt> void apply(Opt &O) const {
+  virtual void getExtraOptionNames(SmallVectorImpl<StringRef> &) {} 
+ 
+  // addOccurrence - Wrapper around handleOccurrence that enforces Flags. 
+  // 
+  virtual bool addOccurrence(unsigned pos, StringRef ArgName, StringRef Value, 
+                             bool MultiArg = false); 
+ 
+  // Prints option name followed by message.  Always returns true. 
+  bool error(const Twine &Message, StringRef ArgName = StringRef(), raw_ostream &Errs = llvm::errs()); 
+  bool error(const Twine &Message, raw_ostream &Errs) { 
+    return error(Message, StringRef(), Errs); 
+  } 
+ 
+  inline int getNumOccurrences() const { return NumOccurrences; } 
+  void reset(); 
+}; 
+ 
+//===----------------------------------------------------------------------===// 
+// Command line option modifiers that can be used to modify the behavior of 
+// command line option parsers... 
+// 
+ 
+// desc - Modifier to set the description shown in the -help output... 
+struct desc { 
+  StringRef Desc; 
+ 
+  desc(StringRef Str) : Desc(Str) {} 
+ 
+  void apply(Option &O) const { O.setDescription(Desc); } 
+}; 
+ 
+// value_desc - Modifier to set the value description shown in the -help 
+// output... 
+struct value_desc { 
+  StringRef Desc; 
+ 
+  value_desc(StringRef Str) : Desc(Str) {} 
+ 
+  void apply(Option &O) const { O.setValueStr(Desc); } 
+}; 
+ 
+// init - Specify a default (initial) value for the command line argument, if 
+// the default constructor for the argument type does not give you what you 
+// want.  This is only valid on "opt" arguments, not on "list" arguments. 
+// 
+template <class Ty> struct initializer { 
+  const Ty &Init; 
+  initializer(const Ty &Val) : Init(Val) {} 
+ 
+  template <class Opt> void apply(Opt &O) const { O.setInitialValue(Init); } 
+}; 
+ 
+template <class Ty> initializer<Ty> init(const Ty &Val) { 
+  return initializer<Ty>(Val); 
+} 
+ 
+// location - Allow the user to specify which external variable they want to 
+// store the results of the command line argument processing into, if they don't 
+// want to store it in the option itself. 
+// 
+template <class Ty> struct LocationClass { 
+  Ty &Loc; 
+ 
+  LocationClass(Ty &L) : Loc(L) {} 
+ 
+  template <class Opt> void apply(Opt &O) const { O.setLocation(O, Loc); } 
+}; 
+ 
+template <class Ty> LocationClass<Ty> location(Ty &L) { 
+  return LocationClass<Ty>(L); 
+} 
+ 
+// cat - Specifiy the Option category for the command line argument to belong 
+// to. 
+struct cat { 
+  OptionCategory &Category; 
+ 
+  cat(OptionCategory &c) : Category(c) {} 
+ 
+  template <class Opt> void apply(Opt &O) const { O.addCategory(Category); } 
+}; 
+ 
+// sub - Specify the subcommand that this option belongs to. 
+struct sub { 
+  SubCommand &Sub; 
+ 
+  sub(SubCommand &S) : Sub(S) {} 
+ 
+  template <class Opt> void apply(Opt &O) const { O.addSubCommand(Sub); } 
+}; 
+ 
+// Specify a callback function to be called when an option is seen. 
+// Can be used to set other options automatically. 
+template <typename R, typename Ty> struct cb { 
+  std::function<R(Ty)> CB; 
+ 
+  cb(std::function<R(Ty)> CB) : CB(CB) {} 
+ 
+  template <typename Opt> void apply(Opt &O) const { O.setCallback(CB); } 
+}; 
+ 
+namespace detail { 
+template <typename F> 
+struct callback_traits : public callback_traits<decltype(&F::operator())> {}; 
+ 
+template <typename R, typename C, typename... Args> 
+struct callback_traits<R (C::*)(Args...) const> { 
+  using result_type = R; 
+  using arg_type = std::tuple_element_t<0, std::tuple<Args...>>; 
+  static_assert(sizeof...(Args) == 1, "callback function must have one and only one parameter"); 
+  static_assert(std::is_same<result_type, void>::value, 
+                "callback return type must be void"); 
+  static_assert(std::is_lvalue_reference<arg_type>::value && 
+                    std::is_const<std::remove_reference_t<arg_type>>::value, 
+                "callback arg_type must be a const lvalue reference"); 
+}; 
+} // namespace detail 
+ 
+template <typename F> 
+cb<typename detail::callback_traits<F>::result_type, 
+   typename detail::callback_traits<F>::arg_type> 
+callback(F CB) { 
+  using result_type = typename detail::callback_traits<F>::result_type; 
+  using arg_type = typename detail::callback_traits<F>::arg_type; 
+  return cb<result_type, arg_type>(CB); 
+} 
+ 
+//===----------------------------------------------------------------------===// 
+// OptionValue class 
+ 
+// Support value comparison outside the template. 
+struct GenericOptionValue { 
+  virtual bool compare(const GenericOptionValue &V) const = 0; 
+ 
+protected: 
+  GenericOptionValue() = default; 
+  GenericOptionValue(const GenericOptionValue&) = default; 
+  GenericOptionValue &operator=(const GenericOptionValue &) = default; 
+  ~GenericOptionValue() = default; 
+ 
+private: 
+  virtual void anchor(); 
+}; 
+ 
+template <class DataType> struct OptionValue; 
+ 
+// The default value safely does nothing. Option value printing is only 
+// best-effort. 
+template <class DataType, bool isClass> 
+struct OptionValueBase : public GenericOptionValue { 
+  // Temporary storage for argument passing. 
+  using WrapperType = OptionValue<DataType>; 
+ 
+  bool hasValue() const { return false; } 
+ 
+  const DataType &getValue() const { llvm_unreachable("no default value"); } 
+ 
+  // Some options may take their value from a different data type. 
+  template <class DT> void setValue(const DT & /*V*/) {} 
+ 
+  bool compare(const DataType & /*V*/) const { return false; } 
+ 
+  bool compare(const GenericOptionValue & /*V*/) const override { 
+    return false; 
+  } 
+ 
+protected: 
+  ~OptionValueBase() = default; 
+}; 
+ 
+// Simple copy of the option value. 
+template <class DataType> class OptionValueCopy : public GenericOptionValue { 
+  DataType Value; 
+  bool Valid = false; 
+ 
+protected: 
+  OptionValueCopy(const OptionValueCopy&) = default; 
+  OptionValueCopy &operator=(const OptionValueCopy &) = default; 
+  ~OptionValueCopy() = default; 
+ 
+public: 
+  OptionValueCopy() = default; 
+ 
+  bool hasValue() const { return Valid; } 
+ 
+  const DataType &getValue() const { 
+    assert(Valid && "invalid option value"); 
+    return Value; 
+  } 
+ 
+  void setValue(const DataType &V) { 
+    Valid = true; 
+    Value = V; 
+  } 
+ 
+  bool compare(const DataType &V) const { return Valid && (Value != V); } 
+ 
+  bool compare(const GenericOptionValue &V) const override { 
+    const OptionValueCopy<DataType> &VC = 
+        static_cast<const OptionValueCopy<DataType> &>(V); 
+    if (!VC.hasValue()) 
+      return false; 
+    return compare(VC.getValue()); 
+  } 
+}; 
+ 
+// Non-class option values. 
+template <class DataType> 
+struct OptionValueBase<DataType, false> : OptionValueCopy<DataType> { 
+  using WrapperType = DataType; 
+ 
+protected: 
+  OptionValueBase() = default; 
+  OptionValueBase(const OptionValueBase&) = default; 
+  OptionValueBase &operator=(const OptionValueBase &) = default; 
+  ~OptionValueBase() = default; 
+}; 
+ 
+// Top-level option class. 
+template <class DataType> 
+struct OptionValue final 
+    : OptionValueBase<DataType, std::is_class<DataType>::value> { 
+  OptionValue() = default; 
+ 
+  OptionValue(const DataType &V) { this->setValue(V); } 
+ 
+  // Some options may take their value from a different data type. 
+  template <class DT> OptionValue<DataType> &operator=(const DT &V) { 
+    this->setValue(V); 
+    return *this; 
+  } 
+}; 
+ 
+// Other safe-to-copy-by-value common option types. 
+enum boolOrDefault { BOU_UNSET, BOU_TRUE, BOU_FALSE }; 
+template <> 
+struct OptionValue<cl::boolOrDefault> final 
+    : OptionValueCopy<cl::boolOrDefault> { 
+  using WrapperType = cl::boolOrDefault; 
+ 
+  OptionValue() = default; 
+ 
+  OptionValue(const cl::boolOrDefault &V) { this->setValue(V); } 
+ 
+  OptionValue<cl::boolOrDefault> &operator=(const cl::boolOrDefault &V) { 
+    setValue(V); 
+    return *this; 
+  } 
+ 
+private: 
+  void anchor() override; 
+}; 
+ 
+template <> 
+struct OptionValue<std::string> final : OptionValueCopy<std::string> { 
+  using WrapperType = StringRef; 
+ 
+  OptionValue() = default; 
+ 
+  OptionValue(const std::string &V) { this->setValue(V); } 
+ 
+  OptionValue<std::string> &operator=(const std::string &V) { 
+    setValue(V); 
+    return *this; 
+  } 
+ 
+private: 
+  void anchor() override; 
+}; 
+ 
+//===----------------------------------------------------------------------===// 
+// Enum valued command line option 
+// 
+ 
+// This represents a single enum value, using "int" as the underlying type. 
+struct OptionEnumValue { 
+  StringRef Name; 
+  int Value; 
+  StringRef Description; 
+}; 
+ 
+#define clEnumVal(ENUMVAL, DESC)                                               \ 
+  llvm::cl::OptionEnumValue { #ENUMVAL, int(ENUMVAL), DESC } 
+#define clEnumValN(ENUMVAL, FLAGNAME, DESC)                                    \ 
+  llvm::cl::OptionEnumValue { FLAGNAME, int(ENUMVAL), DESC } 
+ 
+// values - For custom data types, allow specifying a group of values together 
+// as the values that go into the mapping that the option handler uses. 
+// 
+class ValuesClass { 
+  // Use a vector instead of a map, because the lists should be short, 
+  // the overhead is less, and most importantly, it keeps them in the order 
+  // inserted so we can print our option out nicely. 
+  SmallVector<OptionEnumValue, 4> Values; 
+ 
+public: 
+  ValuesClass(std::initializer_list<OptionEnumValue> Options) 
+      : Values(Options) {} 
+ 
+  template <class Opt> void apply(Opt &O) const { 
     for (const auto &Value : Values)
-      O.getParser().addLiteralOption(Value.Name, Value.Value,
-                                     Value.Description);
-  }
-};
-
-/// Helper to build a ValuesClass by forwarding a variable number of arguments
-/// as an initializer list to the ValuesClass constructor.
-template <typename... OptsTy> ValuesClass values(OptsTy... Options) {
-  return ValuesClass({Options...});
-}
-
-//===----------------------------------------------------------------------===//
-// parser class - Parameterizable parser for different data types.  By default,
-// known data types (string, int, bool) have specialized parsers, that do what
-// you would expect.  The default parser, used for data types that are not
-// built-in, uses a mapping table to map specific options to values, which is
-// used, among other things, to handle enum types.
-
-//--------------------------------------------------
-// generic_parser_base - This class holds all the non-generic code that we do
-// not need replicated for every instance of the generic parser.  This also
-// allows us to put stuff into CommandLine.cpp
-//
-class generic_parser_base {
-protected:
-  class GenericOptionInfo {
-  public:
-    GenericOptionInfo(StringRef name, StringRef helpStr)
-        : Name(name), HelpStr(helpStr) {}
-    StringRef Name;
-    StringRef HelpStr;
-  };
-
-public:
-  generic_parser_base(Option &O) : Owner(O) {}
-
-  virtual ~generic_parser_base() = default;
-  // Base class should have virtual-destructor
-
-  // getNumOptions - Virtual function implemented by generic subclass to
-  // indicate how many entries are in Values.
-  //
-  virtual unsigned getNumOptions() const = 0;
-
-  // getOption - Return option name N.
-  virtual StringRef getOption(unsigned N) const = 0;
-
-  // getDescription - Return description N
-  virtual StringRef getDescription(unsigned N) const = 0;
-
-  // Return the width of the option tag for printing...
-  virtual size_t getOptionWidth(const Option &O) const;
-
-  virtual const GenericOptionValue &getOptionValue(unsigned N) const = 0;
-
-  // printOptionInfo - Print out information about this option.  The
-  // to-be-maintained width is specified.
-  //
-  virtual void printOptionInfo(const Option &O, size_t GlobalWidth) const;
-
-  void printGenericOptionDiff(const Option &O, const GenericOptionValue &V,
-                              const GenericOptionValue &Default,
-                              size_t GlobalWidth) const;
-
-  // printOptionDiff - print the value of an option and it's default.
-  //
-  // Template definition ensures that the option and default have the same
-  // DataType (via the same AnyOptionValue).
-  template <class AnyOptionValue>
-  void printOptionDiff(const Option &O, const AnyOptionValue &V,
-                       const AnyOptionValue &Default,
-                       size_t GlobalWidth) const {
-    printGenericOptionDiff(O, V, Default, GlobalWidth);
-  }
-
-  void initialize() {}
-
-  void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) {
-    // If there has been no argstr specified, that means that we need to add an
-    // argument for every possible option.  This ensures that our options are
-    // vectored to us.
-    if (!Owner.hasArgStr())
-      for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
-        OptionNames.push_back(getOption(i));
-  }
-
-  enum ValueExpected getValueExpectedFlagDefault() const {
-    // If there is an ArgStr specified, then we are of the form:
-    //
-    //    -opt=O2   or   -opt O2  or  -optO2
-    //
-    // In which case, the value is required.  Otherwise if an arg str has not
-    // been specified, we are of the form:
-    //
-    //    -O2 or O2 or -la (where -l and -a are separate options)
-    //
-    // If this is the case, we cannot allow a value.
-    //
-    if (Owner.hasArgStr())
-      return ValueRequired;
-    else
-      return ValueDisallowed;
-  }
-
-  // findOption - Return the option number corresponding to the specified
-  // argument string.  If the option is not found, getNumOptions() is returned.
-  //
-  unsigned findOption(StringRef Name);
-
-protected:
-  Option &Owner;
-};
-
-// Default parser implementation - This implementation depends on having a
-// mapping of recognized options to values of some sort.  In addition to this,
-// each entry in the mapping also tracks a help message that is printed with the
-// command line option for -help.  Because this is a simple mapping parser, the
-// data type can be any unsupported type.
-//
-template <class DataType> class parser : public generic_parser_base {
-protected:
-  class OptionInfo : public GenericOptionInfo {
-  public:
-    OptionInfo(StringRef name, DataType v, StringRef helpStr)
-        : GenericOptionInfo(name, helpStr), V(v) {}
-
-    OptionValue<DataType> V;
-  };
-  SmallVector<OptionInfo, 8> Values;
-
-public:
-  parser(Option &O) : generic_parser_base(O) {}
-
-  using parser_data_type = DataType;
-
-  // Implement virtual functions needed by generic_parser_base
-  unsigned getNumOptions() const override { return unsigned(Values.size()); }
-  StringRef getOption(unsigned N) const override { return Values[N].Name; }
-  StringRef getDescription(unsigned N) const override {
-    return Values[N].HelpStr;
-  }
-
-  // getOptionValue - Return the value of option name N.
-  const GenericOptionValue &getOptionValue(unsigned N) const override {
-    return Values[N].V;
-  }
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, DataType &V) {
-    StringRef ArgVal;
-    if (Owner.hasArgStr())
-      ArgVal = Arg;
-    else
-      ArgVal = ArgName;
-
-    for (size_t i = 0, e = Values.size(); i != e; ++i)
-      if (Values[i].Name == ArgVal) {
-        V = Values[i].V.getValue();
-        return false;
-      }
-
-    return O.error("Cannot find option named '" + ArgVal + "'!");
-  }
-
-  /// addLiteralOption - Add an entry to the mapping table.
-  ///
-  template <class DT>
-  void addLiteralOption(StringRef Name, const DT &V, StringRef HelpStr) {
-    assert(findOption(Name) == Values.size() && "Option already exists!");
-    OptionInfo X(Name, static_cast<DataType>(V), HelpStr);
-    Values.push_back(X);
-    AddLiteralOption(Owner, Name);
-  }
-
-  /// removeLiteralOption - Remove the specified option.
-  ///
-  void removeLiteralOption(StringRef Name) {
-    unsigned N = findOption(Name);
-    assert(N != Values.size() && "Option not found!");
-    Values.erase(Values.begin() + N);
-  }
-};
-
-//--------------------------------------------------
-// basic_parser - Super class of parsers to provide boilerplate code
-//
-class basic_parser_impl { // non-template implementation of basic_parser<t>
-public:
-  basic_parser_impl(Option &) {}
-
-  virtual ~basic_parser_impl() {}
-
-  enum ValueExpected getValueExpectedFlagDefault() const {
-    return ValueRequired;
-  }
-
-  void getExtraOptionNames(SmallVectorImpl<StringRef> &) {}
-
-  void initialize() {}
-
-  // Return the width of the option tag for printing...
-  size_t getOptionWidth(const Option &O) const;
-
-  // printOptionInfo - Print out information about this option.  The
-  // to-be-maintained width is specified.
-  //
-  void printOptionInfo(const Option &O, size_t GlobalWidth) const;
-
-  // printOptionNoValue - Print a placeholder for options that don't yet support
-  // printOptionDiff().
-  void printOptionNoValue(const Option &O, size_t GlobalWidth) const;
-
-  // getValueName - Overload in subclass to provide a better default value.
-  virtual StringRef getValueName() const { return "value"; }
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  virtual void anchor();
-
-protected:
-  // A helper for basic_parser::printOptionDiff.
-  void printOptionName(const Option &O, size_t GlobalWidth) const;
-};
-
-// basic_parser - The real basic parser is just a template wrapper that provides
-// a typedef for the provided data type.
-//
-template <class DataType> class basic_parser : public basic_parser_impl {
-public:
-  using parser_data_type = DataType;
-  using OptVal = OptionValue<DataType>;
-
-  basic_parser(Option &O) : basic_parser_impl(O) {}
-};
-
-//--------------------------------------------------
-// parser<bool>
-//
-template <> class parser<bool> : public basic_parser<bool> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, bool &Val);
-
-  void initialize() {}
-
-  enum ValueExpected getValueExpectedFlagDefault() const {
-    return ValueOptional;
-  }
-
-  // getValueName - Do not print =<value> at all.
-  StringRef getValueName() const override { return StringRef(); }
-
-  void printOptionDiff(const Option &O, bool V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<bool>;
-
-//--------------------------------------------------
-// parser<boolOrDefault>
-template <> class parser<boolOrDefault> : public basic_parser<boolOrDefault> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, boolOrDefault &Val);
-
-  enum ValueExpected getValueExpectedFlagDefault() const {
-    return ValueOptional;
-  }
-
-  // getValueName - Do not print =<value> at all.
-  StringRef getValueName() const override { return StringRef(); }
-
-  void printOptionDiff(const Option &O, boolOrDefault V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<boolOrDefault>;
-
-//--------------------------------------------------
-// parser<int>
-//
-template <> class parser<int> : public basic_parser<int> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, int &Val);
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "int"; }
-
-  void printOptionDiff(const Option &O, int V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<int>;
-
-//--------------------------------------------------
-// parser<long>
-//
-template <> class parser<long> final : public basic_parser<long> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, long &Val);
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "long"; }
-
-  void printOptionDiff(const Option &O, long V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<long>;
-
-//--------------------------------------------------
-// parser<long long>
-//
-template <> class parser<long long> : public basic_parser<long long> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, long long &Val);
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "long"; }
-
-  void printOptionDiff(const Option &O, long long V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<long long>;
-
-//--------------------------------------------------
-// parser<unsigned>
-//
-template <> class parser<unsigned> : public basic_parser<unsigned> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned &Val);
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "uint"; }
-
-  void printOptionDiff(const Option &O, unsigned V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<unsigned>;
-
-//--------------------------------------------------
-// parser<unsigned long>
-//
-template <>
-class parser<unsigned long> final : public basic_parser<unsigned long> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned long &Val);
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "ulong"; }
-
-  void printOptionDiff(const Option &O, unsigned long V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<unsigned long>;
-
-//--------------------------------------------------
-// parser<unsigned long long>
-//
-template <>
-class parser<unsigned long long> : public basic_parser<unsigned long long> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg,
-             unsigned long long &Val);
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "ulong"; }
-
-  void printOptionDiff(const Option &O, unsigned long long V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<unsigned long long>;
-
-//--------------------------------------------------
-// parser<double>
-//
-template <> class parser<double> : public basic_parser<double> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, double &Val);
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "number"; }
-
-  void printOptionDiff(const Option &O, double V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<double>;
-
-//--------------------------------------------------
-// parser<float>
-//
-template <> class parser<float> : public basic_parser<float> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &O, StringRef ArgName, StringRef Arg, float &Val);
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "number"; }
-
-  void printOptionDiff(const Option &O, float V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<float>;
-
-//--------------------------------------------------
-// parser<std::string>
-//
-template <> class parser<std::string> : public basic_parser<std::string> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &, StringRef, StringRef Arg, std::string &Value) {
-    Value = Arg.str();
-    return false;
-  }
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "string"; }
-
-  void printOptionDiff(const Option &O, StringRef V, const OptVal &Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<std::string>;
-
-//--------------------------------------------------
-// parser<char>
-//
-template <> class parser<char> : public basic_parser<char> {
-public:
-  parser(Option &O) : basic_parser(O) {}
-
-  // parse - Return true on error.
-  bool parse(Option &, StringRef, StringRef Arg, char &Value) {
-    Value = Arg[0];
-    return false;
-  }
-
-  // getValueName - Overload in subclass to provide a better default value.
-  StringRef getValueName() const override { return "char"; }
-
-  void printOptionDiff(const Option &O, char V, OptVal Default,
-                       size_t GlobalWidth) const;
-
-  // An out-of-line virtual method to provide a 'home' for this class.
-  void anchor() override;
-};
-
-extern template class basic_parser<char>;
-
-//--------------------------------------------------
-// PrintOptionDiff
-//
-// This collection of wrappers is the intermediary between class opt and class
-// parser to handle all the template nastiness.
-
-// This overloaded function is selected by the generic parser.
-template <class ParserClass, class DT>
-void printOptionDiff(const Option &O, const generic_parser_base &P, const DT &V,
-                     const OptionValue<DT> &Default, size_t GlobalWidth) {
-  OptionValue<DT> OV = V;
-  P.printOptionDiff(O, OV, Default, GlobalWidth);
-}
-
-// This is instantiated for basic parsers when the parsed value has a different
-// type than the option value. e.g. HelpPrinter.
-template <class ParserDT, class ValDT> struct OptionDiffPrinter {
-  void print(const Option &O, const parser<ParserDT> &P, const ValDT & /*V*/,
-             const OptionValue<ValDT> & /*Default*/, size_t GlobalWidth) {
-    P.printOptionNoValue(O, GlobalWidth);
-  }
-};
-
-// This is instantiated for basic parsers when the parsed value has the same
-// type as the option value.
-template <class DT> struct OptionDiffPrinter<DT, DT> {
-  void print(const Option &O, const parser<DT> &P, const DT &V,
-             const OptionValue<DT> &Default, size_t GlobalWidth) {
-    P.printOptionDiff(O, V, Default, GlobalWidth);
-  }
-};
-
-// This overloaded function is selected by the basic parser, which may parse a
-// different type than the option type.
-template <class ParserClass, class ValDT>
-void printOptionDiff(
-    const Option &O,
-    const basic_parser<typename ParserClass::parser_data_type> &P,
-    const ValDT &V, const OptionValue<ValDT> &Default, size_t GlobalWidth) {
-
-  OptionDiffPrinter<typename ParserClass::parser_data_type, ValDT> printer;
-  printer.print(O, static_cast<const ParserClass &>(P), V, Default,
-                GlobalWidth);
-}
-
-//===----------------------------------------------------------------------===//
-// applicator class - This class is used because we must use partial
-// specialization to handle literal string arguments specially (const char* does
-// not correctly respond to the apply method).  Because the syntax to use this
-// is a pain, we have the 'apply' method below to handle the nastiness...
-//
-template <class Mod> struct applicator {
-  template <class Opt> static void opt(const Mod &M, Opt &O) { M.apply(O); }
-};
-
-// Handle const char* as a special case...
-template <unsigned n> struct applicator<char[n]> {
-  template <class Opt> static void opt(StringRef Str, Opt &O) {
-    O.setArgStr(Str);
-  }
-};
-template <unsigned n> struct applicator<const char[n]> {
-  template <class Opt> static void opt(StringRef Str, Opt &O) {
-    O.setArgStr(Str);
-  }
-};
-template <> struct applicator<StringRef > {
-  template <class Opt> static void opt(StringRef Str, Opt &O) {
-    O.setArgStr(Str);
-  }
-};
-
-template <> struct applicator<NumOccurrencesFlag> {
-  static void opt(NumOccurrencesFlag N, Option &O) {
-    O.setNumOccurrencesFlag(N);
-  }
-};
-
-template <> struct applicator<ValueExpected> {
-  static void opt(ValueExpected VE, Option &O) { O.setValueExpectedFlag(VE); }
-};
-
-template <> struct applicator<OptionHidden> {
-  static void opt(OptionHidden OH, Option &O) { O.setHiddenFlag(OH); }
-};
-
-template <> struct applicator<FormattingFlags> {
-  static void opt(FormattingFlags FF, Option &O) { O.setFormattingFlag(FF); }
-};
-
-template <> struct applicator<MiscFlags> {
-  static void opt(MiscFlags MF, Option &O) {
-    assert((MF != Grouping || O.ArgStr.size() == 1) &&
-           "cl::Grouping can only apply to single charater Options.");
-    O.setMiscFlag(MF);
-  }
-};
-
-// apply method - Apply modifiers to an option in a type safe way.
-template <class Opt, class Mod, class... Mods>
-void apply(Opt *O, const Mod &M, const Mods &... Ms) {
-  applicator<Mod>::opt(M, *O);
-  apply(O, Ms...);
-}
-
-template <class Opt, class Mod> void apply(Opt *O, const Mod &M) {
-  applicator<Mod>::opt(M, *O);
-}
-
-//===----------------------------------------------------------------------===//
-// opt_storage class
-
-// Default storage class definition: external storage.  This implementation
-// assumes the user will specify a variable to store the data into with the
-// cl::location(x) modifier.
-//
-template <class DataType, bool ExternalStorage, bool isClass>
-class opt_storage {
-  DataType *Location = nullptr; // Where to store the object...
-  OptionValue<DataType> Default;
-
-  void check_location() const {
-    assert(Location && "cl::location(...) not specified for a command "
-                       "line option with external storage, "
-                       "or cl::init specified before cl::location()!!");
-  }
-
-public:
-  opt_storage() = default;
-
-  bool setLocation(Option &O, DataType &L) {
-    if (Location)
-      return O.error("cl::location(x) specified more than once!");
-    Location = &L;
-    Default = L;
-    return false;
-  }
-
-  template <class T> void setValue(const T &V, bool initial = false) {
-    check_location();
-    *Location = V;
-    if (initial)
-      Default = V;
-  }
-
-  DataType &getValue() {
-    check_location();
-    return *Location;
-  }
-  const DataType &getValue() const {
-    check_location();
-    return *Location;
-  }
-
-  operator DataType() const { return this->getValue(); }
-
-  const OptionValue<DataType> &getDefault() const { return Default; }
-};
-
-// Define how to hold a class type object, such as a string.  Since we can
-// inherit from a class, we do so.  This makes us exactly compatible with the
-// object in all cases that it is used.
-//
-template <class DataType>
-class opt_storage<DataType, false, true> : public DataType {
-public:
-  OptionValue<DataType> Default;
-
-  template <class T> void setValue(const T &V, bool initial = false) {
-    DataType::operator=(V);
-    if (initial)
-      Default = V;
-  }
-
-  DataType &getValue() { return *this; }
-  const DataType &getValue() const { return *this; }
-
-  const OptionValue<DataType> &getDefault() const { return Default; }
-};
-
-// Define a partial specialization to handle things we cannot inherit from.  In
-// this case, we store an instance through containment, and overload operators
-// to get at the value.
-//
-template <class DataType> class opt_storage<DataType, false, false> {
-public:
-  DataType Value;
-  OptionValue<DataType> Default;
-
-  // Make sure we initialize the value with the default constructor for the
-  // type.
-  opt_storage() : Value(DataType()), Default(DataType()) {}
-
-  template <class T> void setValue(const T &V, bool initial = false) {
-    Value = V;
-    if (initial)
-      Default = V;
-  }
-  DataType &getValue() { return Value; }
-  DataType getValue() const { return Value; }
-
-  const OptionValue<DataType> &getDefault() const { return Default; }
-
-  operator DataType() const { return getValue(); }
-
-  // If the datatype is a pointer, support -> on it.
-  DataType operator->() const { return Value; }
-};
-
-//===----------------------------------------------------------------------===//
-// opt - A scalar command line option.
-//
-template <class DataType, bool ExternalStorage = false,
-          class ParserClass = parser<DataType>>
-class opt : public Option,
-            public opt_storage<DataType, ExternalStorage,
-                               std::is_class<DataType>::value> {
-  ParserClass Parser;
-
-  bool handleOccurrence(unsigned pos, StringRef ArgName,
-                        StringRef Arg) override {
-    typename ParserClass::parser_data_type Val =
-        typename ParserClass::parser_data_type();
-    if (Parser.parse(*this, ArgName, Arg, Val))
-      return true; // Parse error!
-    this->setValue(Val);
-    this->setPosition(pos);
-    Callback(Val);
-    return false;
-  }
-
-  enum ValueExpected getValueExpectedFlagDefault() const override {
-    return Parser.getValueExpectedFlagDefault();
-  }
-
-  void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override {
-    return Parser.getExtraOptionNames(OptionNames);
-  }
-
-  // Forward printing stuff to the parser...
-  size_t getOptionWidth() const override {
-    return Parser.getOptionWidth(*this);
-  }
-
-  void printOptionInfo(size_t GlobalWidth) const override {
-    Parser.printOptionInfo(*this, GlobalWidth);
-  }
-
-  void printOptionValue(size_t GlobalWidth, bool Force) const override {
-    if (Force || this->getDefault().compare(this->getValue())) {
-      cl::printOptionDiff<ParserClass>(*this, Parser, this->getValue(),
-                                       this->getDefault(), GlobalWidth);
-    }
-  }
-
-  template <class T,
-            class = std::enable_if_t<std::is_assignable<T &, T>::value>>
-  void setDefaultImpl() {
-    const OptionValue<DataType> &V = this->getDefault();
-    if (V.hasValue())
-      this->setValue(V.getValue());
-  }
-
-  template <class T,
-            class = std::enable_if_t<!std::is_assignable<T &, T>::value>>
-  void setDefaultImpl(...) {}
-
-  void setDefault() override { setDefaultImpl<DataType>(); }
-
-  void done() {
-    addArgument();
-    Parser.initialize();
-  }
-
-public:
-  // Command line options should not be copyable
-  opt(const opt &) = delete;
-  opt &operator=(const opt &) = delete;
-
-  // setInitialValue - Used by the cl::init modifier...
-  void setInitialValue(const DataType &V) { this->setValue(V, true); }
-
-  ParserClass &getParser() { return Parser; }
-
-  template <class T> DataType &operator=(const T &Val) {
-    this->setValue(Val);
-    Callback(Val);
-    return this->getValue();
-  }
-
-  template <class... Mods>
-  explicit opt(const Mods &... Ms)
+      O.getParser().addLiteralOption(Value.Name, Value.Value, 
+                                     Value.Description); 
+  } 
+}; 
+ 
+/// Helper to build a ValuesClass by forwarding a variable number of arguments 
+/// as an initializer list to the ValuesClass constructor. 
+template <typename... OptsTy> ValuesClass values(OptsTy... Options) { 
+  return ValuesClass({Options...}); 
+} 
+ 
+//===----------------------------------------------------------------------===// 
+// parser class - Parameterizable parser for different data types.  By default, 
+// known data types (string, int, bool) have specialized parsers, that do what 
+// you would expect.  The default parser, used for data types that are not 
+// built-in, uses a mapping table to map specific options to values, which is 
+// used, among other things, to handle enum types. 
+ 
+//-------------------------------------------------- 
+// generic_parser_base - This class holds all the non-generic code that we do 
+// not need replicated for every instance of the generic parser.  This also 
+// allows us to put stuff into CommandLine.cpp 
+// 
+class generic_parser_base { 
+protected: 
+  class GenericOptionInfo { 
+  public: 
+    GenericOptionInfo(StringRef name, StringRef helpStr) 
+        : Name(name), HelpStr(helpStr) {} 
+    StringRef Name; 
+    StringRef HelpStr; 
+  }; 
+ 
+public: 
+  generic_parser_base(Option &O) : Owner(O) {} 
+ 
+  virtual ~generic_parser_base() = default; 
+  // Base class should have virtual-destructor 
+ 
+  // getNumOptions - Virtual function implemented by generic subclass to 
+  // indicate how many entries are in Values. 
+  // 
+  virtual unsigned getNumOptions() const = 0; 
+ 
+  // getOption - Return option name N. 
+  virtual StringRef getOption(unsigned N) const = 0; 
+ 
+  // getDescription - Return description N 
+  virtual StringRef getDescription(unsigned N) const = 0; 
+ 
+  // Return the width of the option tag for printing... 
+  virtual size_t getOptionWidth(const Option &O) const; 
+ 
+  virtual const GenericOptionValue &getOptionValue(unsigned N) const = 0; 
+ 
+  // printOptionInfo - Print out information about this option.  The 
+  // to-be-maintained width is specified. 
+  // 
+  virtual void printOptionInfo(const Option &O, size_t GlobalWidth) const; 
+ 
+  void printGenericOptionDiff(const Option &O, const GenericOptionValue &V, 
+                              const GenericOptionValue &Default, 
+                              size_t GlobalWidth) const; 
+ 
+  // printOptionDiff - print the value of an option and it's default. 
+  // 
+  // Template definition ensures that the option and default have the same 
+  // DataType (via the same AnyOptionValue). 
+  template <class AnyOptionValue> 
+  void printOptionDiff(const Option &O, const AnyOptionValue &V, 
+                       const AnyOptionValue &Default, 
+                       size_t GlobalWidth) const { 
+    printGenericOptionDiff(O, V, Default, GlobalWidth); 
+  } 
+ 
+  void initialize() {} 
+ 
+  void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) { 
+    // If there has been no argstr specified, that means that we need to add an 
+    // argument for every possible option.  This ensures that our options are 
+    // vectored to us. 
+    if (!Owner.hasArgStr()) 
+      for (unsigned i = 0, e = getNumOptions(); i != e; ++i) 
+        OptionNames.push_back(getOption(i)); 
+  } 
+ 
+  enum ValueExpected getValueExpectedFlagDefault() const { 
+    // If there is an ArgStr specified, then we are of the form: 
+    // 
+    //    -opt=O2   or   -opt O2  or  -optO2 
+    // 
+    // In which case, the value is required.  Otherwise if an arg str has not 
+    // been specified, we are of the form: 
+    // 
+    //    -O2 or O2 or -la (where -l and -a are separate options) 
+    // 
+    // If this is the case, we cannot allow a value. 
+    // 
+    if (Owner.hasArgStr()) 
+      return ValueRequired; 
+    else 
+      return ValueDisallowed; 
+  } 
+ 
+  // findOption - Return the option number corresponding to the specified 
+  // argument string.  If the option is not found, getNumOptions() is returned. 
+  // 
+  unsigned findOption(StringRef Name); 
+ 
+protected: 
+  Option &Owner; 
+}; 
+ 
+// Default parser implementation - This implementation depends on having a 
+// mapping of recognized options to values of some sort.  In addition to this, 
+// each entry in the mapping also tracks a help message that is printed with the 
+// command line option for -help.  Because this is a simple mapping parser, the 
+// data type can be any unsupported type. 
+// 
+template <class DataType> class parser : public generic_parser_base { 
+protected: 
+  class OptionInfo : public GenericOptionInfo { 
+  public: 
+    OptionInfo(StringRef name, DataType v, StringRef helpStr) 
+        : GenericOptionInfo(name, helpStr), V(v) {} 
+ 
+    OptionValue<DataType> V; 
+  }; 
+  SmallVector<OptionInfo, 8> Values; 
+ 
+public: 
+  parser(Option &O) : generic_parser_base(O) {} 
+ 
+  using parser_data_type = DataType; 
+ 
+  // Implement virtual functions needed by generic_parser_base 
+  unsigned getNumOptions() const override { return unsigned(Values.size()); } 
+  StringRef getOption(unsigned N) const override { return Values[N].Name; } 
+  StringRef getDescription(unsigned N) const override { 
+    return Values[N].HelpStr; 
+  } 
+ 
+  // getOptionValue - Return the value of option name N. 
+  const GenericOptionValue &getOptionValue(unsigned N) const override { 
+    return Values[N].V; 
+  } 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, DataType &V) { 
+    StringRef ArgVal; 
+    if (Owner.hasArgStr()) 
+      ArgVal = Arg; 
+    else 
+      ArgVal = ArgName; 
+ 
+    for (size_t i = 0, e = Values.size(); i != e; ++i) 
+      if (Values[i].Name == ArgVal) { 
+        V = Values[i].V.getValue(); 
+        return false; 
+      } 
+ 
+    return O.error("Cannot find option named '" + ArgVal + "'!"); 
+  } 
+ 
+  /// addLiteralOption - Add an entry to the mapping table. 
+  /// 
+  template <class DT> 
+  void addLiteralOption(StringRef Name, const DT &V, StringRef HelpStr) { 
+    assert(findOption(Name) == Values.size() && "Option already exists!"); 
+    OptionInfo X(Name, static_cast<DataType>(V), HelpStr); 
+    Values.push_back(X); 
+    AddLiteralOption(Owner, Name); 
+  } 
+ 
+  /// removeLiteralOption - Remove the specified option. 
+  /// 
+  void removeLiteralOption(StringRef Name) { 
+    unsigned N = findOption(Name); 
+    assert(N != Values.size() && "Option not found!"); 
+    Values.erase(Values.begin() + N); 
+  } 
+}; 
+ 
+//-------------------------------------------------- 
+// basic_parser - Super class of parsers to provide boilerplate code 
+// 
+class basic_parser_impl { // non-template implementation of basic_parser<t> 
+public: 
+  basic_parser_impl(Option &) {} 
+ 
+  virtual ~basic_parser_impl() {} 
+ 
+  enum ValueExpected getValueExpectedFlagDefault() const { 
+    return ValueRequired; 
+  } 
+ 
+  void getExtraOptionNames(SmallVectorImpl<StringRef> &) {} 
+ 
+  void initialize() {} 
+ 
+  // Return the width of the option tag for printing... 
+  size_t getOptionWidth(const Option &O) const; 
+ 
+  // printOptionInfo - Print out information about this option.  The 
+  // to-be-maintained width is specified. 
+  // 
+  void printOptionInfo(const Option &O, size_t GlobalWidth) const; 
+ 
+  // printOptionNoValue - Print a placeholder for options that don't yet support 
+  // printOptionDiff(). 
+  void printOptionNoValue(const Option &O, size_t GlobalWidth) const; 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  virtual StringRef getValueName() const { return "value"; } 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  virtual void anchor(); 
+ 
+protected: 
+  // A helper for basic_parser::printOptionDiff. 
+  void printOptionName(const Option &O, size_t GlobalWidth) const; 
+}; 
+ 
+// basic_parser - The real basic parser is just a template wrapper that provides 
+// a typedef for the provided data type. 
+// 
+template <class DataType> class basic_parser : public basic_parser_impl { 
+public: 
+  using parser_data_type = DataType; 
+  using OptVal = OptionValue<DataType>; 
+ 
+  basic_parser(Option &O) : basic_parser_impl(O) {} 
+}; 
+ 
+//-------------------------------------------------- 
+// parser<bool> 
+// 
+template <> class parser<bool> : public basic_parser<bool> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, bool &Val); 
+ 
+  void initialize() {} 
+ 
+  enum ValueExpected getValueExpectedFlagDefault() const { 
+    return ValueOptional; 
+  } 
+ 
+  // getValueName - Do not print =<value> at all. 
+  StringRef getValueName() const override { return StringRef(); } 
+ 
+  void printOptionDiff(const Option &O, bool V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<bool>; 
+ 
+//-------------------------------------------------- 
+// parser<boolOrDefault> 
+template <> class parser<boolOrDefault> : public basic_parser<boolOrDefault> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, boolOrDefault &Val); 
+ 
+  enum ValueExpected getValueExpectedFlagDefault() const { 
+    return ValueOptional; 
+  } 
+ 
+  // getValueName - Do not print =<value> at all. 
+  StringRef getValueName() const override { return StringRef(); } 
+ 
+  void printOptionDiff(const Option &O, boolOrDefault V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<boolOrDefault>; 
+ 
+//-------------------------------------------------- 
+// parser<int> 
+// 
+template <> class parser<int> : public basic_parser<int> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, int &Val); 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "int"; } 
+ 
+  void printOptionDiff(const Option &O, int V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<int>; 
+ 
+//-------------------------------------------------- 
+// parser<long> 
+// 
+template <> class parser<long> final : public basic_parser<long> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, long &Val); 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "long"; } 
+ 
+  void printOptionDiff(const Option &O, long V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<long>; 
+ 
+//-------------------------------------------------- 
+// parser<long long> 
+// 
+template <> class parser<long long> : public basic_parser<long long> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, long long &Val); 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "long"; } 
+ 
+  void printOptionDiff(const Option &O, long long V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<long long>; 
+ 
+//-------------------------------------------------- 
+// parser<unsigned> 
+// 
+template <> class parser<unsigned> : public basic_parser<unsigned> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned &Val); 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "uint"; } 
+ 
+  void printOptionDiff(const Option &O, unsigned V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<unsigned>; 
+ 
+//-------------------------------------------------- 
+// parser<unsigned long> 
+// 
+template <> 
+class parser<unsigned long> final : public basic_parser<unsigned long> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned long &Val); 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "ulong"; } 
+ 
+  void printOptionDiff(const Option &O, unsigned long V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<unsigned long>; 
+ 
+//-------------------------------------------------- 
+// parser<unsigned long long> 
+// 
+template <> 
+class parser<unsigned long long> : public basic_parser<unsigned long long> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, 
+             unsigned long long &Val); 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "ulong"; } 
+ 
+  void printOptionDiff(const Option &O, unsigned long long V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<unsigned long long>; 
+ 
+//-------------------------------------------------- 
+// parser<double> 
+// 
+template <> class parser<double> : public basic_parser<double> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, double &Val); 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "number"; } 
+ 
+  void printOptionDiff(const Option &O, double V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<double>; 
+ 
+//-------------------------------------------------- 
+// parser<float> 
+// 
+template <> class parser<float> : public basic_parser<float> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, float &Val); 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "number"; } 
+ 
+  void printOptionDiff(const Option &O, float V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<float>; 
+ 
+//-------------------------------------------------- 
+// parser<std::string> 
+// 
+template <> class parser<std::string> : public basic_parser<std::string> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &, StringRef, StringRef Arg, std::string &Value) { 
+    Value = Arg.str(); 
+    return false; 
+  } 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "string"; } 
+ 
+  void printOptionDiff(const Option &O, StringRef V, const OptVal &Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<std::string>; 
+ 
+//-------------------------------------------------- 
+// parser<char> 
+// 
+template <> class parser<char> : public basic_parser<char> { 
+public: 
+  parser(Option &O) : basic_parser(O) {} 
+ 
+  // parse - Return true on error. 
+  bool parse(Option &, StringRef, StringRef Arg, char &Value) { 
+    Value = Arg[0]; 
+    return false; 
+  } 
+ 
+  // getValueName - Overload in subclass to provide a better default value. 
+  StringRef getValueName() const override { return "char"; } 
+ 
+  void printOptionDiff(const Option &O, char V, OptVal Default, 
+                       size_t GlobalWidth) const; 
+ 
+  // An out-of-line virtual method to provide a 'home' for this class. 
+  void anchor() override; 
+}; 
+ 
+extern template class basic_parser<char>; 
+ 
+//-------------------------------------------------- 
+// PrintOptionDiff 
+// 
+// This collection of wrappers is the intermediary between class opt and class 
+// parser to handle all the template nastiness. 
+ 
+// This overloaded function is selected by the generic parser. 
+template <class ParserClass, class DT> 
+void printOptionDiff(const Option &O, const generic_parser_base &P, const DT &V, 
+                     const OptionValue<DT> &Default, size_t GlobalWidth) { 
+  OptionValue<DT> OV = V; 
+  P.printOptionDiff(O, OV, Default, GlobalWidth); 
+} 
+ 
+// This is instantiated for basic parsers when the parsed value has a different 
+// type than the option value. e.g. HelpPrinter. 
+template <class ParserDT, class ValDT> struct OptionDiffPrinter { 
+  void print(const Option &O, const parser<ParserDT> &P, const ValDT & /*V*/, 
+             const OptionValue<ValDT> & /*Default*/, size_t GlobalWidth) { 
+    P.printOptionNoValue(O, GlobalWidth); 
+  } 
+}; 
+ 
+// This is instantiated for basic parsers when the parsed value has the same 
+// type as the option value. 
+template <class DT> struct OptionDiffPrinter<DT, DT> { 
+  void print(const Option &O, const parser<DT> &P, const DT &V, 
+             const OptionValue<DT> &Default, size_t GlobalWidth) { 
+    P.printOptionDiff(O, V, Default, GlobalWidth); 
+  } 
+}; 
+ 
+// This overloaded function is selected by the basic parser, which may parse a 
+// different type than the option type. 
+template <class ParserClass, class ValDT> 
+void printOptionDiff( 
+    const Option &O, 
+    const basic_parser<typename ParserClass::parser_data_type> &P, 
+    const ValDT &V, const OptionValue<ValDT> &Default, size_t GlobalWidth) { 
+ 
+  OptionDiffPrinter<typename ParserClass::parser_data_type, ValDT> printer; 
+  printer.print(O, static_cast<const ParserClass &>(P), V, Default, 
+                GlobalWidth); 
+} 
+ 
+//===----------------------------------------------------------------------===// 
+// applicator class - This class is used because we must use partial 
+// specialization to handle literal string arguments specially (const char* does 
+// not correctly respond to the apply method).  Because the syntax to use this 
+// is a pain, we have the 'apply' method below to handle the nastiness... 
+// 
+template <class Mod> struct applicator { 
+  template <class Opt> static void opt(const Mod &M, Opt &O) { M.apply(O); } 
+}; 
+ 
+// Handle const char* as a special case... 
+template <unsigned n> struct applicator<char[n]> { 
+  template <class Opt> static void opt(StringRef Str, Opt &O) { 
+    O.setArgStr(Str); 
+  } 
+}; 
+template <unsigned n> struct applicator<const char[n]> { 
+  template <class Opt> static void opt(StringRef Str, Opt &O) { 
+    O.setArgStr(Str); 
+  } 
+}; 
+template <> struct applicator<StringRef > { 
+  template <class Opt> static void opt(StringRef Str, Opt &O) { 
+    O.setArgStr(Str); 
+  } 
+}; 
+ 
+template <> struct applicator<NumOccurrencesFlag> { 
+  static void opt(NumOccurrencesFlag N, Option &O) { 
+    O.setNumOccurrencesFlag(N); 
+  } 
+}; 
+ 
+template <> struct applicator<ValueExpected> { 
+  static void opt(ValueExpected VE, Option &O) { O.setValueExpectedFlag(VE); } 
+}; 
+ 
+template <> struct applicator<OptionHidden> { 
+  static void opt(OptionHidden OH, Option &O) { O.setHiddenFlag(OH); } 
+}; 
+ 
+template <> struct applicator<FormattingFlags> { 
+  static void opt(FormattingFlags FF, Option &O) { O.setFormattingFlag(FF); } 
+}; 
+ 
+template <> struct applicator<MiscFlags> { 
+  static void opt(MiscFlags MF, Option &O) { 
+    assert((MF != Grouping || O.ArgStr.size() == 1) && 
+           "cl::Grouping can only apply to single charater Options."); 
+    O.setMiscFlag(MF); 
+  } 
+}; 
+ 
+// apply method - Apply modifiers to an option in a type safe way. 
+template <class Opt, class Mod, class... Mods> 
+void apply(Opt *O, const Mod &M, const Mods &... Ms) { 
+  applicator<Mod>::opt(M, *O); 
+  apply(O, Ms...); 
+} 
+ 
+template <class Opt, class Mod> void apply(Opt *O, const Mod &M) { 
+  applicator<Mod>::opt(M, *O); 
+} 
+ 
+//===----------------------------------------------------------------------===// 
+// opt_storage class 
+ 
+// Default storage class definition: external storage.  This implementation 
+// assumes the user will specify a variable to store the data into with the 
+// cl::location(x) modifier. 
+// 
+template <class DataType, bool ExternalStorage, bool isClass> 
+class opt_storage { 
+  DataType *Location = nullptr; // Where to store the object... 
+  OptionValue<DataType> Default; 
+ 
+  void check_location() const { 
+    assert(Location && "cl::location(...) not specified for a command " 
+                       "line option with external storage, " 
+                       "or cl::init specified before cl::location()!!"); 
+  } 
+ 
+public: 
+  opt_storage() = default; 
+ 
+  bool setLocation(Option &O, DataType &L) { 
+    if (Location) 
+      return O.error("cl::location(x) specified more than once!"); 
+    Location = &L; 
+    Default = L; 
+    return false; 
+  } 
+ 
+  template <class T> void setValue(const T &V, bool initial = false) { 
+    check_location(); 
+    *Location = V; 
+    if (initial) 
+      Default = V; 
+  } 
+ 
+  DataType &getValue() { 
+    check_location(); 
+    return *Location; 
+  } 
+  const DataType &getValue() const { 
+    check_location(); 
+    return *Location; 
+  } 
+ 
+  operator DataType() const { return this->getValue(); } 
+ 
+  const OptionValue<DataType> &getDefault() const { return Default; } 
+}; 
+ 
+// Define how to hold a class type object, such as a string.  Since we can 
+// inherit from a class, we do so.  This makes us exactly compatible with the 
+// object in all cases that it is used. 
+// 
+template <class DataType> 
+class opt_storage<DataType, false, true> : public DataType { 
+public: 
+  OptionValue<DataType> Default; 
+ 
+  template <class T> void setValue(const T &V, bool initial = false) { 
+    DataType::operator=(V); 
+    if (initial) 
+      Default = V; 
+  } 
+ 
+  DataType &getValue() { return *this; } 
+  const DataType &getValue() const { return *this; } 
+ 
+  const OptionValue<DataType> &getDefault() const { return Default; } 
+}; 
+ 
+// Define a partial specialization to handle things we cannot inherit from.  In 
+// this case, we store an instance through containment, and overload operators 
+// to get at the value. 
+// 
+template <class DataType> class opt_storage<DataType, false, false> { 
+public: 
+  DataType Value; 
+  OptionValue<DataType> Default; 
+ 
+  // Make sure we initialize the value with the default constructor for the 
+  // type. 
+  opt_storage() : Value(DataType()), Default(DataType()) {} 
+ 
+  template <class T> void setValue(const T &V, bool initial = false) { 
+    Value = V; 
+    if (initial) 
+      Default = V; 
+  } 
+  DataType &getValue() { return Value; } 
+  DataType getValue() const { return Value; } 
+ 
+  const OptionValue<DataType> &getDefault() const { return Default; } 
+ 
+  operator DataType() const { return getValue(); } 
+ 
+  // If the datatype is a pointer, support -> on it. 
+  DataType operator->() const { return Value; } 
+}; 
+ 
+//===----------------------------------------------------------------------===// 
+// opt - A scalar command line option. 
+// 
+template <class DataType, bool ExternalStorage = false, 
+          class ParserClass = parser<DataType>> 
+class opt : public Option, 
+            public opt_storage<DataType, ExternalStorage, 
+                               std::is_class<DataType>::value> { 
+  ParserClass Parser; 
+ 
+  bool handleOccurrence(unsigned pos, StringRef ArgName, 
+                        StringRef Arg) override { 
+    typename ParserClass::parser_data_type Val = 
+        typename ParserClass::parser_data_type(); 
+    if (Parser.parse(*this, ArgName, Arg, Val)) 
+      return true; // Parse error! 
+    this->setValue(Val); 
+    this->setPosition(pos); 
+    Callback(Val); 
+    return false; 
+  } 
+ 
+  enum ValueExpected getValueExpectedFlagDefault() const override { 
+    return Parser.getValueExpectedFlagDefault(); 
+  } 
+ 
+  void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override { 
+    return Parser.getExtraOptionNames(OptionNames); 
+  } 
+ 
+  // Forward printing stuff to the parser... 
+  size_t getOptionWidth() const override { 
+    return Parser.getOptionWidth(*this); 
+  } 
+ 
+  void printOptionInfo(size_t GlobalWidth) const override { 
+    Parser.printOptionInfo(*this, GlobalWidth); 
+  } 
+ 
+  void printOptionValue(size_t GlobalWidth, bool Force) const override { 
+    if (Force || this->getDefault().compare(this->getValue())) { 
+      cl::printOptionDiff<ParserClass>(*this, Parser, this->getValue(), 
+                                       this->getDefault(), GlobalWidth); 
+    } 
+  } 
+ 
+  template <class T, 
+            class = std::enable_if_t<std::is_assignable<T &, T>::value>> 
+  void setDefaultImpl() { 
+    const OptionValue<DataType> &V = this->getDefault(); 
+    if (V.hasValue()) 
+      this->setValue(V.getValue()); 
+  } 
+ 
+  template <class T, 
+            class = std::enable_if_t<!std::is_assignable<T &, T>::value>> 
+  void setDefaultImpl(...) {} 
+ 
+  void setDefault() override { setDefaultImpl<DataType>(); } 
+ 
+  void done() { 
+    addArgument(); 
+    Parser.initialize(); 
+  } 
+ 
+public: 
+  // Command line options should not be copyable 
+  opt(const opt &) = delete; 
+  opt &operator=(const opt &) = delete; 
+ 
+  // setInitialValue - Used by the cl::init modifier... 
+  void setInitialValue(const DataType &V) { this->setValue(V, true); } 
+ 
+  ParserClass &getParser() { return Parser; } 
+ 
+  template <class T> DataType &operator=(const T &Val) { 
+    this->setValue(Val); 
+    Callback(Val); 
+    return this->getValue(); 
+  } 
+ 
+  template <class... Mods> 
+  explicit opt(const Mods &... Ms) 
       : Option(llvm::cl::Optional, NotHidden), Parser(*this) {
-    apply(this, Ms...);
-    done();
-  }
-
-  void setCallback(
-      std::function<void(const typename ParserClass::parser_data_type &)> CB) {
-    Callback = CB;
-  }
-
-  std::function<void(const typename ParserClass::parser_data_type &)> Callback =
-      [](const typename ParserClass::parser_data_type &) {};
-};
-
-extern template class opt<unsigned>;
-extern template class opt<int>;
-extern template class opt<std::string>;
-extern template class opt<char>;
-extern template class opt<bool>;
-
-//===----------------------------------------------------------------------===//
-// list_storage class
-
-// Default storage class definition: external storage.  This implementation
-// assumes the user will specify a variable to store the data into with the
-// cl::location(x) modifier.
-//
-template <class DataType, class StorageClass> class list_storage {
-  StorageClass *Location = nullptr; // Where to store the object...
-
-public:
-  list_storage() = default;
-
-  void clear() {}
-
-  bool setLocation(Option &O, StorageClass &L) {
-    if (Location)
-      return O.error("cl::location(x) specified more than once!");
-    Location = &L;
-    return false;
-  }
-
-  template <class T> void addValue(const T &V) {
-    assert(Location != 0 && "cl::location(...) not specified for a command "
-                            "line option with external storage!");
-    Location->push_back(V);
-  }
-};
-
-// Define how to hold a class type object, such as a string.
-// Originally this code inherited from std::vector. In transitioning to a new
-// API for command line options we should change this. The new implementation
-// of this list_storage specialization implements the minimum subset of the
-// std::vector API required for all the current clients.
-//
-// FIXME: Reduce this API to a more narrow subset of std::vector
-//
-template <class DataType> class list_storage<DataType, bool> {
-  std::vector<DataType> Storage;
-
-public:
-  using iterator = typename std::vector<DataType>::iterator;
-
-  iterator begin() { return Storage.begin(); }
-  iterator end() { return Storage.end(); }
-
-  using const_iterator = typename std::vector<DataType>::const_iterator;
-
-  const_iterator begin() const { return Storage.begin(); }
-  const_iterator end() const { return Storage.end(); }
-
-  using size_type = typename std::vector<DataType>::size_type;
-
-  size_type size() const { return Storage.size(); }
-
-  bool empty() const { return Storage.empty(); }
-
-  void push_back(const DataType &value) { Storage.push_back(value); }
-  void push_back(DataType &&value) { Storage.push_back(value); }
-
-  using reference = typename std::vector<DataType>::reference;
-  using const_reference = typename std::vector<DataType>::const_reference;
-
-  reference operator[](size_type pos) { return Storage[pos]; }
-  const_reference operator[](size_type pos) const { return Storage[pos]; }
-
-  void clear() {
-    Storage.clear();
-  }
-
-  iterator erase(const_iterator pos) { return Storage.erase(pos); }
-  iterator erase(const_iterator first, const_iterator last) {
-    return Storage.erase(first, last);
-  }
-
-  iterator erase(iterator pos) { return Storage.erase(pos); }
-  iterator erase(iterator first, iterator last) {
-    return Storage.erase(first, last);
-  }
-
-  iterator insert(const_iterator pos, const DataType &value) {
-    return Storage.insert(pos, value);
-  }
-  iterator insert(const_iterator pos, DataType &&value) {
-    return Storage.insert(pos, value);
-  }
-
-  iterator insert(iterator pos, const DataType &value) {
-    return Storage.insert(pos, value);
-  }
-  iterator insert(iterator pos, DataType &&value) {
-    return Storage.insert(pos, value);
-  }
-
-  reference front() { return Storage.front(); }
-  const_reference front() const { return Storage.front(); }
-
-  operator std::vector<DataType> &() { return Storage; }
-  operator ArrayRef<DataType>() const { return Storage; }
-  std::vector<DataType> *operator&() { return &Storage; }
-  const std::vector<DataType> *operator&() const { return &Storage; }
-
-  template <class T> void addValue(const T &V) { Storage.push_back(V); }
-};
-
-//===----------------------------------------------------------------------===//
-// list - A list of command line options.
-//
-template <class DataType, class StorageClass = bool,
-          class ParserClass = parser<DataType>>
-class list : public Option, public list_storage<DataType, StorageClass> {
-  std::vector<unsigned> Positions;
-  ParserClass Parser;
-
-  enum ValueExpected getValueExpectedFlagDefault() const override {
-    return Parser.getValueExpectedFlagDefault();
-  }
-
-  void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override {
-    return Parser.getExtraOptionNames(OptionNames);
-  }
-
-  bool handleOccurrence(unsigned pos, StringRef ArgName,
-                        StringRef Arg) override {
-    typename ParserClass::parser_data_type Val =
-        typename ParserClass::parser_data_type();
-    if (Parser.parse(*this, ArgName, Arg, Val))
-      return true; // Parse Error!
-    list_storage<DataType, StorageClass>::addValue(Val);
-    setPosition(pos);
-    Positions.push_back(pos);
-    Callback(Val);
-    return false;
-  }
-
-  // Forward printing stuff to the parser...
-  size_t getOptionWidth() const override {
-    return Parser.getOptionWidth(*this);
-  }
-
-  void printOptionInfo(size_t GlobalWidth) const override {
-    Parser.printOptionInfo(*this, GlobalWidth);
-  }
-
-  // Unimplemented: list options don't currently store their default value.
-  void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override {
-  }
-
-  void setDefault() override {
-    Positions.clear();
-    list_storage<DataType, StorageClass>::clear();
-  }
-
-  void done() {
-    addArgument();
-    Parser.initialize();
-  }
-
-public:
-  // Command line options should not be copyable
-  list(const list &) = delete;
-  list &operator=(const list &) = delete;
-
-  ParserClass &getParser() { return Parser; }
-
-  unsigned getPosition(unsigned optnum) const {
-    assert(optnum < this->size() && "Invalid option index");
-    return Positions[optnum];
-  }
-
-  void setNumAdditionalVals(unsigned n) { Option::setNumAdditionalVals(n); }
-
-  template <class... Mods>
-  explicit list(const Mods &... Ms)
-      : Option(ZeroOrMore, NotHidden), Parser(*this) {
-    apply(this, Ms...);
-    done();
-  }
-
-  void setCallback(
-      std::function<void(const typename ParserClass::parser_data_type &)> CB) {
-    Callback = CB;
-  }
-
-  std::function<void(const typename ParserClass::parser_data_type &)> Callback =
-      [](const typename ParserClass::parser_data_type &) {};
-};
-
-// multi_val - Modifier to set the number of additional values.
-struct multi_val {
-  unsigned AdditionalVals;
-  explicit multi_val(unsigned N) : AdditionalVals(N) {}
-
-  template <typename D, typename S, typename P>
-  void apply(list<D, S, P> &L) const {
-    L.setNumAdditionalVals(AdditionalVals);
-  }
-};
-
-//===----------------------------------------------------------------------===//
-// bits_storage class
-
-// Default storage class definition: external storage.  This implementation
-// assumes the user will specify a variable to store the data into with the
-// cl::location(x) modifier.
-//
-template <class DataType, class StorageClass> class bits_storage {
-  unsigned *Location = nullptr; // Where to store the bits...
-
-  template <class T> static unsigned Bit(const T &V) {
-    unsigned BitPos = reinterpret_cast<unsigned>(V);
-    assert(BitPos < sizeof(unsigned) * CHAR_BIT &&
-           "enum exceeds width of bit vector!");
-    return 1 << BitPos;
-  }
-
-public:
-  bits_storage() = default;
-
-  bool setLocation(Option &O, unsigned &L) {
-    if (Location)
-      return O.error("cl::location(x) specified more than once!");
-    Location = &L;
-    return false;
-  }
-
-  template <class T> void addValue(const T &V) {
-    assert(Location != 0 && "cl::location(...) not specified for a command "
-                            "line option with external storage!");
-    *Location |= Bit(V);
-  }
-
-  unsigned getBits() { return *Location; }
-
-  template <class T> bool isSet(const T &V) {
-    return (*Location & Bit(V)) != 0;
-  }
-};
-
-// Define how to hold bits.  Since we can inherit from a class, we do so.
-// This makes us exactly compatible with the bits in all cases that it is used.
-//
-template <class DataType> class bits_storage<DataType, bool> {
-  unsigned Bits; // Where to store the bits...
-
-  template <class T> static unsigned Bit(const T &V) {
-    unsigned BitPos = (unsigned)V;
-    assert(BitPos < sizeof(unsigned) * CHAR_BIT &&
-           "enum exceeds width of bit vector!");
-    return 1 << BitPos;
-  }
-
-public:
-  template <class T> void addValue(const T &V) { Bits |= Bit(V); }
-
-  unsigned getBits() { return Bits; }
-
-  template <class T> bool isSet(const T &V) { return (Bits & Bit(V)) != 0; }
-};
-
-//===----------------------------------------------------------------------===//
-// bits - A bit vector of command options.
-//
-template <class DataType, class Storage = bool,
-          class ParserClass = parser<DataType>>
-class bits : public Option, public bits_storage<DataType, Storage> {
-  std::vector<unsigned> Positions;
-  ParserClass Parser;
-
-  enum ValueExpected getValueExpectedFlagDefault() const override {
-    return Parser.getValueExpectedFlagDefault();
-  }
-
-  void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override {
-    return Parser.getExtraOptionNames(OptionNames);
-  }
-
-  bool handleOccurrence(unsigned pos, StringRef ArgName,
-                        StringRef Arg) override {
-    typename ParserClass::parser_data_type Val =
-        typename ParserClass::parser_data_type();
-    if (Parser.parse(*this, ArgName, Arg, Val))
-      return true; // Parse Error!
-    this->addValue(Val);
-    setPosition(pos);
-    Positions.push_back(pos);
-    Callback(Val);
-    return false;
-  }
-
-  // Forward printing stuff to the parser...
-  size_t getOptionWidth() const override {
-    return Parser.getOptionWidth(*this);
-  }
-
-  void printOptionInfo(size_t GlobalWidth) const override {
-    Parser.printOptionInfo(*this, GlobalWidth);
-  }
-
-  // Unimplemented: bits options don't currently store their default values.
-  void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override {
-  }
-
-  void setDefault() override {}
-
-  void done() {
-    addArgument();
-    Parser.initialize();
-  }
-
-public:
-  // Command line options should not be copyable
-  bits(const bits &) = delete;
-  bits &operator=(const bits &) = delete;
-
-  ParserClass &getParser() { return Parser; }
-
-  unsigned getPosition(unsigned optnum) const {
-    assert(optnum < this->size() && "Invalid option index");
-    return Positions[optnum];
-  }
-
-  template <class... Mods>
-  explicit bits(const Mods &... Ms)
-      : Option(ZeroOrMore, NotHidden), Parser(*this) {
-    apply(this, Ms...);
-    done();
-  }
-
-  void setCallback(
-      std::function<void(const typename ParserClass::parser_data_type &)> CB) {
-    Callback = CB;
-  }
-
-  std::function<void(const typename ParserClass::parser_data_type &)> Callback =
-      [](const typename ParserClass::parser_data_type &) {};
-};
-
-//===----------------------------------------------------------------------===//
-// Aliased command line option (alias this name to a preexisting name)
-//
-
-class alias : public Option {
-  Option *AliasFor;
-
-  bool handleOccurrence(unsigned pos, StringRef /*ArgName*/,
-                        StringRef Arg) override {
-    return AliasFor->handleOccurrence(pos, AliasFor->ArgStr, Arg);
-  }
-
-  bool addOccurrence(unsigned pos, StringRef /*ArgName*/, StringRef Value,
-                     bool MultiArg = false) override {
-    return AliasFor->addOccurrence(pos, AliasFor->ArgStr, Value, MultiArg);
-  }
-
-  // Handle printing stuff...
-  size_t getOptionWidth() const override;
-  void printOptionInfo(size_t GlobalWidth) const override;
-
-  // Aliases do not need to print their values.
-  void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override {
-  }
-
-  void setDefault() override { AliasFor->setDefault(); }
-
-  ValueExpected getValueExpectedFlagDefault() const override {
-    return AliasFor->getValueExpectedFlag();
-  }
-
-  void done() {
-    if (!hasArgStr())
-      error("cl::alias must have argument name specified!");
-    if (!AliasFor)
-      error("cl::alias must have an cl::aliasopt(option) specified!");
-    if (!Subs.empty())
-      error("cl::alias must not have cl::sub(), aliased option's cl::sub() will be used!");
-    Subs = AliasFor->Subs;
-    Categories = AliasFor->Categories;
-    addArgument();
-  }
-
-public:
-  // Command line options should not be copyable
-  alias(const alias &) = delete;
-  alias &operator=(const alias &) = delete;
-
-  void setAliasFor(Option &O) {
-    if (AliasFor)
-      error("cl::alias must only have one cl::aliasopt(...) specified!");
-    AliasFor = &O;
-  }
-
-  template <class... Mods>
-  explicit alias(const Mods &... Ms)
-      : Option(Optional, Hidden), AliasFor(nullptr) {
-    apply(this, Ms...);
-    done();
-  }
-};
-
-// aliasfor - Modifier to set the option an alias aliases.
-struct aliasopt {
-  Option &Opt;
-
-  explicit aliasopt(Option &O) : Opt(O) {}
-
-  void apply(alias &A) const { A.setAliasFor(Opt); }
-};
-
-// extrahelp - provide additional help at the end of the normal help
-// output. All occurrences of cl::extrahelp will be accumulated and
-// printed to stderr at the end of the regular help, just before
-// exit is called.
-struct extrahelp {
-  StringRef morehelp;
-
-  explicit extrahelp(StringRef help);
-};
-
-void PrintVersionMessage();
-
-/// This function just prints the help message, exactly the same way as if the
-/// -help or -help-hidden option had been given on the command line.
-///
-/// \param Hidden if true will print hidden options
-/// \param Categorized if true print options in categories
-void PrintHelpMessage(bool Hidden = false, bool Categorized = false);
-
-//===----------------------------------------------------------------------===//
-// Public interface for accessing registered options.
-//
-
-/// Use this to get a StringMap to all registered named options
-/// (e.g. -help).
-///
-/// \return A reference to the StringMap used by the cl APIs to parse options.
-///
-/// Access to unnamed arguments (i.e. positional) are not provided because
-/// it is expected that the client already has access to these.
-///
-/// Typical usage:
-/// \code
-/// main(int argc,char* argv[]) {
-/// StringMap<llvm::cl::Option*> &opts = llvm::cl::getRegisteredOptions();
-/// assert(opts.count("help") == 1)
-/// opts["help"]->setDescription("Show alphabetical help information")
-/// // More code
-/// llvm::cl::ParseCommandLineOptions(argc,argv);
-/// //More code
-/// }
-/// \endcode
-///
-/// This interface is useful for modifying options in libraries that are out of
-/// the control of the client. The options should be modified before calling
-/// llvm::cl::ParseCommandLineOptions().
-///
-/// Hopefully this API can be deprecated soon. Any situation where options need
-/// to be modified by tools or libraries should be handled by sane APIs rather
-/// than just handing around a global list.
-StringMap<Option *> &getRegisteredOptions(SubCommand &Sub = *TopLevelSubCommand);
-
-/// Use this to get all registered SubCommands from the provided parser.
-///
-/// \return A range of all SubCommand pointers registered with the parser.
-///
-/// Typical usage:
-/// \code
-/// main(int argc, char* argv[]) {
-///   llvm::cl::ParseCommandLineOptions(argc, argv);
-///   for (auto* S : llvm::cl::getRegisteredSubcommands()) {
-///     if (*S) {
-///       std::cout << "Executing subcommand: " << S->getName() << std::endl;
-///       // Execute some function based on the name...
-///     }
-///   }
-/// }
-/// \endcode
-///
-/// This interface is useful for defining subcommands in libraries and
-/// the dispatch from a single point (like in the main function).
-iterator_range<typename SmallPtrSet<SubCommand *, 4>::iterator>
-getRegisteredSubcommands();
-
-//===----------------------------------------------------------------------===//
-// Standalone command line processing utilities.
-//
-
-/// Tokenizes a command line that can contain escapes and quotes.
-//
-/// The quoting rules match those used by GCC and other tools that use
-/// libiberty's buildargv() or expandargv() utilities, and do not match bash.
-/// They differ from buildargv() on treatment of backslashes that do not escape
-/// a special character to make it possible to accept most Windows file paths.
-///
-/// \param [in] Source The string to be split on whitespace with quotes.
-/// \param [in] Saver Delegates back to the caller for saving parsed strings.
-/// \param [in] MarkEOLs true if tokenizing a response file and you want end of
-/// lines and end of the response file to be marked with a nullptr string.
-/// \param [out] NewArgv All parsed strings are appended to NewArgv.
-void TokenizeGNUCommandLine(StringRef Source, StringSaver &Saver,
-                            SmallVectorImpl<const char *> &NewArgv,
-                            bool MarkEOLs = false);
-
-/// Tokenizes a Windows command line which may contain quotes and escaped
-/// quotes.
-///
-/// See MSDN docs for CommandLineToArgvW for information on the quoting rules.
-/// http://msdn.microsoft.com/en-us/library/windows/desktop/17w5ykft(v=vs.85).aspx
-///
-/// \param [in] Source The string to be split on whitespace with quotes.
-/// \param [in] Saver Delegates back to the caller for saving parsed strings.
-/// \param [in] MarkEOLs true if tokenizing a response file and you want end of
-/// lines and end of the response file to be marked with a nullptr string.
-/// \param [out] NewArgv All parsed strings are appended to NewArgv.
-void TokenizeWindowsCommandLine(StringRef Source, StringSaver &Saver,
-                                SmallVectorImpl<const char *> &NewArgv,
-                                bool MarkEOLs = false);
-
-/// Tokenizes a Windows command line while attempting to avoid copies. If no
-/// quoting or escaping was used, this produces substrings of the original
-/// string. If a token requires unquoting, it will be allocated with the
-/// StringSaver.
-void TokenizeWindowsCommandLineNoCopy(StringRef Source, StringSaver &Saver,
-                                      SmallVectorImpl<StringRef> &NewArgv);
-
-/// String tokenization function type.  Should be compatible with either
-/// Windows or Unix command line tokenizers.
-using TokenizerCallback = void (*)(StringRef Source, StringSaver &Saver,
-                                   SmallVectorImpl<const char *> &NewArgv,
-                                   bool MarkEOLs);
-
-/// Tokenizes content of configuration file.
-///
-/// \param [in] Source The string representing content of config file.
-/// \param [in] Saver Delegates back to the caller for saving parsed strings.
-/// \param [out] NewArgv All parsed strings are appended to NewArgv.
-/// \param [in] MarkEOLs Added for compatibility with TokenizerCallback.
-///
-/// It works like TokenizeGNUCommandLine with ability to skip comment lines.
-///
-void tokenizeConfigFile(StringRef Source, StringSaver &Saver,
-                        SmallVectorImpl<const char *> &NewArgv,
-                        bool MarkEOLs = false);
-
-/// Reads command line options from the given configuration file.
-///
-/// \param [in] CfgFileName Path to configuration file.
-/// \param [in] Saver  Objects that saves allocated strings.
-/// \param [out] Argv Array to which the read options are added.
-/// \return true if the file was successfully read.
-///
-/// It reads content of the specified file, tokenizes it and expands "@file"
-/// commands resolving file names in them relative to the directory where
-/// CfgFilename resides.
-///
-bool readConfigFile(StringRef CfgFileName, StringSaver &Saver,
-                    SmallVectorImpl<const char *> &Argv);
-
-/// Expand response files on a command line recursively using the given
-/// StringSaver and tokenization strategy.  Argv should contain the command line
-/// before expansion and will be modified in place. If requested, Argv will
-/// also be populated with nullptrs indicating where each response file line
-/// ends, which is useful for the "/link" argument that needs to consume all
-/// remaining arguments only until the next end of line, when in a response
-/// file.
-///
-/// \param [in] Saver Delegates back to the caller for saving parsed strings.
-/// \param [in] Tokenizer Tokenization strategy. Typically Unix or Windows.
-/// \param [in,out] Argv Command line into which to expand response files.
-/// \param [in] MarkEOLs Mark end of lines and the end of the response file
-/// with nullptrs in the Argv vector.
-/// \param [in] RelativeNames true if names of nested response files must be
-/// resolved relative to including file.
-/// \param [in] FS File system used for all file access when running the tool.
-/// \param [in] CurrentDir Path used to resolve relative rsp files. If set to
-/// None, process' cwd is used instead.
-/// \return true if all @files were expanded successfully or there were none.
-bool ExpandResponseFiles(
-    StringSaver &Saver, TokenizerCallback Tokenizer,
-    SmallVectorImpl<const char *> &Argv, bool MarkEOLs = false,
-    bool RelativeNames = false,
-    llvm::vfs::FileSystem &FS = *llvm::vfs::getRealFileSystem(),
-    llvm::Optional<llvm::StringRef> CurrentDir = llvm::None);
-
+    apply(this, Ms...); 
+    done(); 
+  } 
+ 
+  void setCallback( 
+      std::function<void(const typename ParserClass::parser_data_type &)> CB) { 
+    Callback = CB; 
+  } 
+ 
+  std::function<void(const typename ParserClass::parser_data_type &)> Callback = 
+      [](const typename ParserClass::parser_data_type &) {}; 
+}; 
+ 
+extern template class opt<unsigned>; 
+extern template class opt<int>; 
+extern template class opt<std::string>; 
+extern template class opt<char>; 
+extern template class opt<bool>; 
+ 
+//===----------------------------------------------------------------------===// 
+// list_storage class 
+ 
+// Default storage class definition: external storage.  This implementation 
+// assumes the user will specify a variable to store the data into with the 
+// cl::location(x) modifier. 
+// 
+template <class DataType, class StorageClass> class list_storage { 
+  StorageClass *Location = nullptr; // Where to store the object... 
+ 
+public: 
+  list_storage() = default; 
+ 
+  void clear() {} 
+ 
+  bool setLocation(Option &O, StorageClass &L) { 
+    if (Location) 
+      return O.error("cl::location(x) specified more than once!"); 
+    Location = &L; 
+    return false; 
+  } 
+ 
+  template <class T> void addValue(const T &V) { 
+    assert(Location != 0 && "cl::location(...) not specified for a command " 
+                            "line option with external storage!"); 
+    Location->push_back(V); 
+  } 
+}; 
+ 
+// Define how to hold a class type object, such as a string. 
+// Originally this code inherited from std::vector. In transitioning to a new 
+// API for command line options we should change this. The new implementation 
+// of this list_storage specialization implements the minimum subset of the 
+// std::vector API required for all the current clients. 
+// 
+// FIXME: Reduce this API to a more narrow subset of std::vector 
+// 
+template <class DataType> class list_storage<DataType, bool> { 
+  std::vector<DataType> Storage; 
+ 
+public: 
+  using iterator = typename std::vector<DataType>::iterator; 
+ 
+  iterator begin() { return Storage.begin(); } 
+  iterator end() { return Storage.end(); } 
+ 
+  using const_iterator = typename std::vector<DataType>::const_iterator; 
+ 
+  const_iterator begin() const { return Storage.begin(); } 
+  const_iterator end() const { return Storage.end(); } 
+ 
+  using size_type = typename std::vector<DataType>::size_type; 
+ 
+  size_type size() const { return Storage.size(); } 
+ 
+  bool empty() const { return Storage.empty(); } 
+ 
+  void push_back(const DataType &value) { Storage.push_back(value); } 
+  void push_back(DataType &&value) { Storage.push_back(value); } 
+ 
+  using reference = typename std::vector<DataType>::reference; 
+  using const_reference = typename std::vector<DataType>::const_reference; 
+ 
+  reference operator[](size_type pos) { return Storage[pos]; } 
+  const_reference operator[](size_type pos) const { return Storage[pos]; } 
+ 
+  void clear() { 
+    Storage.clear(); 
+  } 
+ 
+  iterator erase(const_iterator pos) { return Storage.erase(pos); } 
+  iterator erase(const_iterator first, const_iterator last) { 
+    return Storage.erase(first, last); 
+  } 
+ 
+  iterator erase(iterator pos) { return Storage.erase(pos); } 
+  iterator erase(iterator first, iterator last) { 
+    return Storage.erase(first, last); 
+  } 
+ 
+  iterator insert(const_iterator pos, const DataType &value) { 
+    return Storage.insert(pos, value); 
+  } 
+  iterator insert(const_iterator pos, DataType &&value) { 
+    return Storage.insert(pos, value); 
+  } 
+ 
+  iterator insert(iterator pos, const DataType &value) { 
+    return Storage.insert(pos, value); 
+  } 
+  iterator insert(iterator pos, DataType &&value) { 
+    return Storage.insert(pos, value); 
+  } 
+ 
+  reference front() { return Storage.front(); } 
+  const_reference front() const { return Storage.front(); } 
+ 
+  operator std::vector<DataType> &() { return Storage; } 
+  operator ArrayRef<DataType>() const { return Storage; } 
+  std::vector<DataType> *operator&() { return &Storage; } 
+  const std::vector<DataType> *operator&() const { return &Storage; } 
+ 
+  template <class T> void addValue(const T &V) { Storage.push_back(V); } 
+}; 
+ 
+//===----------------------------------------------------------------------===// 
+// list - A list of command line options. 
+// 
+template <class DataType, class StorageClass = bool, 
+          class ParserClass = parser<DataType>> 
+class list : public Option, public list_storage<DataType, StorageClass> { 
+  std::vector<unsigned> Positions; 
+  ParserClass Parser; 
+ 
+  enum ValueExpected getValueExpectedFlagDefault() const override { 
+    return Parser.getValueExpectedFlagDefault(); 
+  } 
+ 
+  void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override { 
+    return Parser.getExtraOptionNames(OptionNames); 
+  } 
+ 
+  bool handleOccurrence(unsigned pos, StringRef ArgName, 
+                        StringRef Arg) override { 
+    typename ParserClass::parser_data_type Val = 
+        typename ParserClass::parser_data_type(); 
+    if (Parser.parse(*this, ArgName, Arg, Val)) 
+      return true; // Parse Error! 
+    list_storage<DataType, StorageClass>::addValue(Val); 
+    setPosition(pos); 
+    Positions.push_back(pos); 
+    Callback(Val); 
+    return false; 
+  } 
+ 
+  // Forward printing stuff to the parser... 
+  size_t getOptionWidth() const override { 
+    return Parser.getOptionWidth(*this); 
+  } 
+ 
+  void printOptionInfo(size_t GlobalWidth) const override { 
+    Parser.printOptionInfo(*this, GlobalWidth); 
+  } 
+ 
+  // Unimplemented: list options don't currently store their default value. 
+  void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override { 
+  } 
+ 
+  void setDefault() override { 
+    Positions.clear(); 
+    list_storage<DataType, StorageClass>::clear(); 
+  } 
+ 
+  void done() { 
+    addArgument(); 
+    Parser.initialize(); 
+  } 
+ 
+public: 
+  // Command line options should not be copyable 
+  list(const list &) = delete; 
+  list &operator=(const list &) = delete; 
+ 
+  ParserClass &getParser() { return Parser; } 
+ 
+  unsigned getPosition(unsigned optnum) const { 
+    assert(optnum < this->size() && "Invalid option index"); 
+    return Positions[optnum]; 
+  } 
+ 
+  void setNumAdditionalVals(unsigned n) { Option::setNumAdditionalVals(n); } 
+ 
+  template <class... Mods> 
+  explicit list(const Mods &... Ms) 
+      : Option(ZeroOrMore, NotHidden), Parser(*this) { 
+    apply(this, Ms...); 
+    done(); 
+  } 
+ 
+  void setCallback( 
+      std::function<void(const typename ParserClass::parser_data_type &)> CB) { 
+    Callback = CB; 
+  } 
+ 
+  std::function<void(const typename ParserClass::parser_data_type &)> Callback = 
+      [](const typename ParserClass::parser_data_type &) {}; 
+}; 
+ 
+// multi_val - Modifier to set the number of additional values. 
+struct multi_val { 
+  unsigned AdditionalVals; 
+  explicit multi_val(unsigned N) : AdditionalVals(N) {} 
+ 
+  template <typename D, typename S, typename P> 
+  void apply(list<D, S, P> &L) const { 
+    L.setNumAdditionalVals(AdditionalVals); 
+  } 
+}; 
+ 
+//===----------------------------------------------------------------------===// 
+// bits_storage class 
+ 
+// Default storage class definition: external storage.  This implementation 
+// assumes the user will specify a variable to store the data into with the 
+// cl::location(x) modifier. 
+// 
+template <class DataType, class StorageClass> class bits_storage { 
+  unsigned *Location = nullptr; // Where to store the bits... 
+ 
+  template <class T> static unsigned Bit(const T &V) { 
+    unsigned BitPos = reinterpret_cast<unsigned>(V); 
+    assert(BitPos < sizeof(unsigned) * CHAR_BIT && 
+           "enum exceeds width of bit vector!"); 
+    return 1 << BitPos; 
+  } 
+ 
+public: 
+  bits_storage() = default; 
+ 
+  bool setLocation(Option &O, unsigned &L) { 
+    if (Location) 
+      return O.error("cl::location(x) specified more than once!"); 
+    Location = &L; 
+    return false; 
+  } 
+ 
+  template <class T> void addValue(const T &V) { 
+    assert(Location != 0 && "cl::location(...) not specified for a command " 
+                            "line option with external storage!"); 
+    *Location |= Bit(V); 
+  } 
+ 
+  unsigned getBits() { return *Location; } 
+ 
+  template <class T> bool isSet(const T &V) { 
+    return (*Location & Bit(V)) != 0; 
+  } 
+}; 
+ 
+// Define how to hold bits.  Since we can inherit from a class, we do so. 
+// This makes us exactly compatible with the bits in all cases that it is used. 
+// 
+template <class DataType> class bits_storage<DataType, bool> { 
+  unsigned Bits; // Where to store the bits... 
+ 
+  template <class T> static unsigned Bit(const T &V) { 
+    unsigned BitPos = (unsigned)V; 
+    assert(BitPos < sizeof(unsigned) * CHAR_BIT && 
+           "enum exceeds width of bit vector!"); 
+    return 1 << BitPos; 
+  } 
+ 
+public: 
+  template <class T> void addValue(const T &V) { Bits |= Bit(V); } 
+ 
+  unsigned getBits() { return Bits; } 
+ 
+  template <class T> bool isSet(const T &V) { return (Bits & Bit(V)) != 0; } 
+}; 
+ 
+//===----------------------------------------------------------------------===// 
+// bits - A bit vector of command options. 
+// 
+template <class DataType, class Storage = bool, 
+          class ParserClass = parser<DataType>> 
+class bits : public Option, public bits_storage<DataType, Storage> { 
+  std::vector<unsigned> Positions; 
+  ParserClass Parser; 
+ 
+  enum ValueExpected getValueExpectedFlagDefault() const override { 
+    return Parser.getValueExpectedFlagDefault(); 
+  } 
+ 
+  void getExtraOptionNames(SmallVectorImpl<StringRef> &OptionNames) override { 
+    return Parser.getExtraOptionNames(OptionNames); 
+  } 
+ 
+  bool handleOccurrence(unsigned pos, StringRef ArgName, 
+                        StringRef Arg) override { 
+    typename ParserClass::parser_data_type Val = 
+        typename ParserClass::parser_data_type(); 
+    if (Parser.parse(*this, ArgName, Arg, Val)) 
+      return true; // Parse Error! 
+    this->addValue(Val); 
+    setPosition(pos); 
+    Positions.push_back(pos); 
+    Callback(Val); 
+    return false; 
+  } 
+ 
+  // Forward printing stuff to the parser... 
+  size_t getOptionWidth() const override { 
+    return Parser.getOptionWidth(*this); 
+  } 
+ 
+  void printOptionInfo(size_t GlobalWidth) const override { 
+    Parser.printOptionInfo(*this, GlobalWidth); 
+  } 
+ 
+  // Unimplemented: bits options don't currently store their default values. 
+  void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override { 
+  } 
+ 
+  void setDefault() override {} 
+ 
+  void done() { 
+    addArgument(); 
+    Parser.initialize(); 
+  } 
+ 
+public: 
+  // Command line options should not be copyable 
+  bits(const bits &) = delete; 
+  bits &operator=(const bits &) = delete; 
+ 
+  ParserClass &getParser() { return Parser; } 
+ 
+  unsigned getPosition(unsigned optnum) const { 
+    assert(optnum < this->size() && "Invalid option index"); 
+    return Positions[optnum]; 
+  } 
+ 
+  template <class... Mods> 
+  explicit bits(const Mods &... Ms) 
+      : Option(ZeroOrMore, NotHidden), Parser(*this) { 
+    apply(this, Ms...); 
+    done(); 
+  } 
+ 
+  void setCallback( 
+      std::function<void(const typename ParserClass::parser_data_type &)> CB) { 
+    Callback = CB; 
+  } 
+ 
+  std::function<void(const typename ParserClass::parser_data_type &)> Callback = 
+      [](const typename ParserClass::parser_data_type &) {}; 
+}; 
+ 
+//===----------------------------------------------------------------------===// 
+// Aliased command line option (alias this name to a preexisting name) 
+// 
+ 
+class alias : public Option { 
+  Option *AliasFor; 
+ 
+  bool handleOccurrence(unsigned pos, StringRef /*ArgName*/, 
+                        StringRef Arg) override { 
+    return AliasFor->handleOccurrence(pos, AliasFor->ArgStr, Arg); 
+  } 
+ 
+  bool addOccurrence(unsigned pos, StringRef /*ArgName*/, StringRef Value, 
+                     bool MultiArg = false) override { 
+    return AliasFor->addOccurrence(pos, AliasFor->ArgStr, Value, MultiArg); 
+  } 
+ 
+  // Handle printing stuff... 
+  size_t getOptionWidth() const override; 
+  void printOptionInfo(size_t GlobalWidth) const override; 
+ 
+  // Aliases do not need to print their values. 
+  void printOptionValue(size_t /*GlobalWidth*/, bool /*Force*/) const override { 
+  } 
+ 
+  void setDefault() override { AliasFor->setDefault(); } 
+ 
+  ValueExpected getValueExpectedFlagDefault() const override { 
+    return AliasFor->getValueExpectedFlag(); 
+  } 
+ 
+  void done() { 
+    if (!hasArgStr()) 
+      error("cl::alias must have argument name specified!"); 
+    if (!AliasFor) 
+      error("cl::alias must have an cl::aliasopt(option) specified!"); 
+    if (!Subs.empty()) 
+      error("cl::alias must not have cl::sub(), aliased option's cl::sub() will be used!"); 
+    Subs = AliasFor->Subs; 
+    Categories = AliasFor->Categories; 
+    addArgument(); 
+  } 
+ 
+public: 
+  // Command line options should not be copyable 
+  alias(const alias &) = delete; 
+  alias &operator=(const alias &) = delete; 
+ 
+  void setAliasFor(Option &O) { 
+    if (AliasFor) 
+      error("cl::alias must only have one cl::aliasopt(...) specified!"); 
+    AliasFor = &O; 
+  } 
+ 
+  template <class... Mods> 
+  explicit alias(const Mods &... Ms) 
+      : Option(Optional, Hidden), AliasFor(nullptr) { 
+    apply(this, Ms...); 
+    done(); 
+  } 
+}; 
+ 
+// aliasfor - Modifier to set the option an alias aliases. 
+struct aliasopt { 
+  Option &Opt; 
+ 
+  explicit aliasopt(Option &O) : Opt(O) {} 
+ 
+  void apply(alias &A) const { A.setAliasFor(Opt); } 
+}; 
+ 
+// extrahelp - provide additional help at the end of the normal help 
+// output. All occurrences of cl::extrahelp will be accumulated and 
+// printed to stderr at the end of the regular help, just before 
+// exit is called. 
+struct extrahelp { 
+  StringRef morehelp; 
+ 
+  explicit extrahelp(StringRef help); 
+}; 
+ 
+void PrintVersionMessage(); 
+ 
+/// This function just prints the help message, exactly the same way as if the 
+/// -help or -help-hidden option had been given on the command line. 
+/// 
+/// \param Hidden if true will print hidden options 
+/// \param Categorized if true print options in categories 
+void PrintHelpMessage(bool Hidden = false, bool Categorized = false); 
+ 
+//===----------------------------------------------------------------------===// 
+// Public interface for accessing registered options. 
+// 
+ 
+/// Use this to get a StringMap to all registered named options 
+/// (e.g. -help). 
+/// 
+/// \return A reference to the StringMap used by the cl APIs to parse options. 
+/// 
+/// Access to unnamed arguments (i.e. positional) are not provided because 
+/// it is expected that the client already has access to these. 
+/// 
+/// Typical usage: 
+/// \code 
+/// main(int argc,char* argv[]) { 
+/// StringMap<llvm::cl::Option*> &opts = llvm::cl::getRegisteredOptions(); 
+/// assert(opts.count("help") == 1) 
+/// opts["help"]->setDescription("Show alphabetical help information") 
+/// // More code 
+/// llvm::cl::ParseCommandLineOptions(argc,argv); 
+/// //More code 
+/// } 
+/// \endcode 
+/// 
+/// This interface is useful for modifying options in libraries that are out of 
+/// the control of the client. The options should be modified before calling 
+/// llvm::cl::ParseCommandLineOptions(). 
+/// 
+/// Hopefully this API can be deprecated soon. Any situation where options need 
+/// to be modified by tools or libraries should be handled by sane APIs rather 
+/// than just handing around a global list. 
+StringMap<Option *> &getRegisteredOptions(SubCommand &Sub = *TopLevelSubCommand); 
+ 
+/// Use this to get all registered SubCommands from the provided parser. 
+/// 
+/// \return A range of all SubCommand pointers registered with the parser. 
+/// 
+/// Typical usage: 
+/// \code 
+/// main(int argc, char* argv[]) { 
+///   llvm::cl::ParseCommandLineOptions(argc, argv); 
+///   for (auto* S : llvm::cl::getRegisteredSubcommands()) { 
+///     if (*S) { 
+///       std::cout << "Executing subcommand: " << S->getName() << std::endl; 
+///       // Execute some function based on the name... 
+///     } 
+///   } 
+/// } 
+/// \endcode 
+/// 
+/// This interface is useful for defining subcommands in libraries and 
+/// the dispatch from a single point (like in the main function). 
+iterator_range<typename SmallPtrSet<SubCommand *, 4>::iterator> 
+getRegisteredSubcommands(); 
+ 
+//===----------------------------------------------------------------------===// 
+// Standalone command line processing utilities. 
+// 
+ 
+/// Tokenizes a command line that can contain escapes and quotes. 
+// 
+/// The quoting rules match those used by GCC and other tools that use 
+/// libiberty's buildargv() or expandargv() utilities, and do not match bash. 
+/// They differ from buildargv() on treatment of backslashes that do not escape 
+/// a special character to make it possible to accept most Windows file paths. 
+/// 
+/// \param [in] Source The string to be split on whitespace with quotes. 
+/// \param [in] Saver Delegates back to the caller for saving parsed strings. 
+/// \param [in] MarkEOLs true if tokenizing a response file and you want end of 
+/// lines and end of the response file to be marked with a nullptr string. 
+/// \param [out] NewArgv All parsed strings are appended to NewArgv. 
+void TokenizeGNUCommandLine(StringRef Source, StringSaver &Saver, 
+                            SmallVectorImpl<const char *> &NewArgv, 
+                            bool MarkEOLs = false); 
+ 
+/// Tokenizes a Windows command line which may contain quotes and escaped 
+/// quotes. 
+/// 
+/// See MSDN docs for CommandLineToArgvW for information on the quoting rules. 
+/// http://msdn.microsoft.com/en-us/library/windows/desktop/17w5ykft(v=vs.85).aspx 
+/// 
+/// \param [in] Source The string to be split on whitespace with quotes. 
+/// \param [in] Saver Delegates back to the caller for saving parsed strings. 
+/// \param [in] MarkEOLs true if tokenizing a response file and you want end of 
+/// lines and end of the response file to be marked with a nullptr string. 
+/// \param [out] NewArgv All parsed strings are appended to NewArgv. 
+void TokenizeWindowsCommandLine(StringRef Source, StringSaver &Saver, 
+                                SmallVectorImpl<const char *> &NewArgv, 
+                                bool MarkEOLs = false); 
+ 
+/// Tokenizes a Windows command line while attempting to avoid copies. If no 
+/// quoting or escaping was used, this produces substrings of the original 
+/// string. If a token requires unquoting, it will be allocated with the 
+/// StringSaver. 
+void TokenizeWindowsCommandLineNoCopy(StringRef Source, StringSaver &Saver, 
+                                      SmallVectorImpl<StringRef> &NewArgv); 
+ 
+/// String tokenization function type.  Should be compatible with either 
+/// Windows or Unix command line tokenizers. 
+using TokenizerCallback = void (*)(StringRef Source, StringSaver &Saver, 
+                                   SmallVectorImpl<const char *> &NewArgv, 
+                                   bool MarkEOLs); 
+ 
+/// Tokenizes content of configuration file. 
+/// 
+/// \param [in] Source The string representing content of config file. 
+/// \param [in] Saver Delegates back to the caller for saving parsed strings. 
+/// \param [out] NewArgv All parsed strings are appended to NewArgv. 
+/// \param [in] MarkEOLs Added for compatibility with TokenizerCallback. 
+/// 
+/// It works like TokenizeGNUCommandLine with ability to skip comment lines. 
+/// 
+void tokenizeConfigFile(StringRef Source, StringSaver &Saver, 
+                        SmallVectorImpl<const char *> &NewArgv, 
+                        bool MarkEOLs = false); 
+ 
+/// Reads command line options from the given configuration file. 
+/// 
+/// \param [in] CfgFileName Path to configuration file. 
+/// \param [in] Saver  Objects that saves allocated strings. 
+/// \param [out] Argv Array to which the read options are added. 
+/// \return true if the file was successfully read. 
+/// 
+/// It reads content of the specified file, tokenizes it and expands "@file" 
+/// commands resolving file names in them relative to the directory where 
+/// CfgFilename resides. 
+/// 
+bool readConfigFile(StringRef CfgFileName, StringSaver &Saver, 
+                    SmallVectorImpl<const char *> &Argv); 
+ 
+/// Expand response files on a command line recursively using the given 
+/// StringSaver and tokenization strategy.  Argv should contain the command line 
+/// before expansion and will be modified in place. If requested, Argv will 
+/// also be populated with nullptrs indicating where each response file line 
+/// ends, which is useful for the "/link" argument that needs to consume all 
+/// remaining arguments only until the next end of line, when in a response 
+/// file. 
+/// 
+/// \param [in] Saver Delegates back to the caller for saving parsed strings. 
+/// \param [in] Tokenizer Tokenization strategy. Typically Unix or Windows. 
+/// \param [in,out] Argv Command line into which to expand response files. 
+/// \param [in] MarkEOLs Mark end of lines and the end of the response file 
+/// with nullptrs in the Argv vector. 
+/// \param [in] RelativeNames true if names of nested response files must be 
+/// resolved relative to including file. 
+/// \param [in] FS File system used for all file access when running the tool. 
+/// \param [in] CurrentDir Path used to resolve relative rsp files. If set to 
+/// None, process' cwd is used instead. 
+/// \return true if all @files were expanded successfully or there were none. 
+bool ExpandResponseFiles( 
+    StringSaver &Saver, TokenizerCallback Tokenizer, 
+    SmallVectorImpl<const char *> &Argv, bool MarkEOLs = false, 
+    bool RelativeNames = false, 
+    llvm::vfs::FileSystem &FS = *llvm::vfs::getRealFileSystem(), 
+    llvm::Optional<llvm::StringRef> CurrentDir = llvm::None); 
+ 
 /// A convenience helper which concatenates the options specified by the
 /// environment variable EnvVar and command line options, then expands response
 /// files recursively. The tokenizer is a predefined GNU or Windows one.
@@ -2113,46 +2113,46 @@ bool expandResponseFiles(int Argc, const char *const *Argv, const char *EnvVar,
                          StringSaver &Saver,
                          SmallVectorImpl<const char *> &NewArgv);
 
-/// Mark all options not part of this category as cl::ReallyHidden.
-///
-/// \param Category the category of options to keep displaying
-///
-/// Some tools (like clang-format) like to be able to hide all options that are
-/// not specific to the tool. This function allows a tool to specify a single
-/// option category to display in the -help output.
-void HideUnrelatedOptions(cl::OptionCategory &Category,
-                          SubCommand &Sub = *TopLevelSubCommand);
-
-/// Mark all options not part of the categories as cl::ReallyHidden.
-///
-/// \param Categories the categories of options to keep displaying.
-///
-/// Some tools (like clang-format) like to be able to hide all options that are
-/// not specific to the tool. This function allows a tool to specify a single
-/// option category to display in the -help output.
-void HideUnrelatedOptions(ArrayRef<const cl::OptionCategory *> Categories,
-                          SubCommand &Sub = *TopLevelSubCommand);
-
-/// Reset all command line options to a state that looks as if they have
-/// never appeared on the command line.  This is useful for being able to parse
-/// a command line multiple times (especially useful for writing tests).
-void ResetAllOptionOccurrences();
-
-/// Reset the command line parser back to its initial state.  This
-/// removes
-/// all options, categories, and subcommands and returns the parser to a state
-/// where no options are supported.
-void ResetCommandLineParser();
-
-/// Parses `Arg` into the option handler `Handler`.
-bool ProvidePositionalOption(Option *Handler, StringRef Arg, int i);
-
-} // end namespace cl
-
-} // end namespace llvm
-
-#endif // LLVM_SUPPORT_COMMANDLINE_H
-
-#ifdef __GNUC__
-#pragma GCC diagnostic pop
-#endif
+/// Mark all options not part of this category as cl::ReallyHidden. 
+/// 
+/// \param Category the category of options to keep displaying 
+/// 
+/// Some tools (like clang-format) like to be able to hide all options that are 
+/// not specific to the tool. This function allows a tool to specify a single 
+/// option category to display in the -help output. 
+void HideUnrelatedOptions(cl::OptionCategory &Category, 
+                          SubCommand &Sub = *TopLevelSubCommand); 
+ 
+/// Mark all options not part of the categories as cl::ReallyHidden. 
+/// 
+/// \param Categories the categories of options to keep displaying. 
+/// 
+/// Some tools (like clang-format) like to be able to hide all options that are 
+/// not specific to the tool. This function allows a tool to specify a single 
+/// option category to display in the -help output. 
+void HideUnrelatedOptions(ArrayRef<const cl::OptionCategory *> Categories, 
+                          SubCommand &Sub = *TopLevelSubCommand); 
+ 
+/// Reset all command line options to a state that looks as if they have 
+/// never appeared on the command line.  This is useful for being able to parse 
+/// a command line multiple times (especially useful for writing tests). 
+void ResetAllOptionOccurrences(); 
+ 
+/// Reset the command line parser back to its initial state.  This 
+/// removes 
+/// all options, categories, and subcommands and returns the parser to a state 
+/// where no options are supported. 
+void ResetCommandLineParser(); 
+ 
+/// Parses `Arg` into the option handler `Handler`. 
+bool ProvidePositionalOption(Option *Handler, StringRef Arg, int i); 
+ 
+} // end namespace cl 
+ 
+} // end namespace llvm 
+ 
+#endif // LLVM_SUPPORT_COMMANDLINE_H 
+ 
+#ifdef __GNUC__ 
+#pragma GCC diagnostic pop 
+#endif