Merge changes to clang's Driver code into LLVM's Option library

This is in preparation for switching the clang driver over to using LLVM's
Option library.  Richard Smith introduced most of these changes to the clang
driver in r167638.

Reviewers: espindola on IRC

Differential Revision: http://llvm-reviews.chandlerc.com/D970

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183925 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Option/ArgList.h

@@ -222,8 +222,17 @@ public:
   /// negation are present, the last one wins.
   bool hasFlag(OptSpecifier Pos, OptSpecifier Neg, bool Default=true) const;
 
+  /// hasFlag - Given an option \p Pos, an alias \p PosAlias and its negative
+  /// form \p Neg, return true if the option or its alias is present, false if
+  /// the negation is present, and \p Default if none of the options are
+  /// given. If multiple options are present, the last one wins.
+  bool hasFlag(OptSpecifier Pos, OptSpecifier PosAlias, OptSpecifier Neg,
+               bool Default = true) const;
+
   /// AddLastArg - Render only the last argument match \p Id0, if present.
   void AddLastArg(ArgStringList &Output, OptSpecifier Id0) const;
+  void AddLastArg(ArgStringList &Output, OptSpecifier Id0,
+                  OptSpecifier Id1) const;
 
   /// AddAllArgs - Render all arguments matching the given ids.
   void AddAllArgs(ArgStringList &Output, OptSpecifier Id0,

include/llvm/Option/OptTable.h

@@ -99,9 +99,6 @@ public:
     return getInfo(id).GroupID;
   }
 
-  /// \brief Should the help for the given option be hidden by default.
-  bool isOptionHelpHidden(OptSpecifier id) const;
-
   /// \brief Get the help text to use to describe this option.
   const char *getOptionHelpText(OptSpecifier id) const {
     return getInfo(id).HelpText;
@@ -151,7 +148,13 @@ public:
   /// \param OS - The stream to write the help text to.
   /// \param Name - The name to use in the usage line.
   /// \param Title - The title to use in the usage line.
-  /// \param ShowHidden - Whether help-hidden arguments should be shown.
+  /// \param FlagsToInclude - If non-zero, only include options with any
+  ///                         of these flags set.
+  /// \param FlagsToExclude - Exclude options with any of these flags set.
+  void PrintHelp(raw_ostream &OS, const char *Name,
+                 const char *Title, unsigned FlagsToInclude,
+                 unsigned FlagsToExclude) const;
+
   void PrintHelp(raw_ostream &OS, const char *Name,
                   const char *Title, bool ShowHidden = false) const;
 };

lib/Option/ArgList.cpp

@@ -206,6 +206,13 @@ bool ArgList::hasFlag(OptSpecifier Pos, OptSpecifier Neg, bool Default) const {
   return Default;
 }
 
+bool ArgList::hasFlag(OptSpecifier Pos, OptSpecifier PosAlias, OptSpecifier Neg,
+                      bool Default) const {
+  if (Arg *A = getLastArg(Pos, PosAlias, Neg))
+    return A->getOption().matches(Pos) || A->getOption().matches(PosAlias);
+  return Default;
+}
+
 StringRef ArgList::getLastArgValue(OptSpecifier Id,
                                          StringRef Default) const {
   if (Arg *A = getLastArg(Id))
@@ -226,6 +233,14 @@ void ArgList::AddLastArg(ArgStringList &Output, OptSpecifier Id) const {
   }
 }
 
+void ArgList::AddLastArg(ArgStringList &Output, OptSpecifier Id0,
+                         OptSpecifier Id1) const {
+  if (Arg *A = getLastArg(Id0, Id1)) {
+    A->claim();
+    A->render(*this, Output);
+  }
+}
+
 void ArgList::AddAllArgs(ArgStringList &Output, OptSpecifier Id0,
                          OptSpecifier Id1, OptSpecifier Id2) const {
   for (arg_iterator it = filtered_begin(Id0, Id1, Id2),

lib/Option/OptTable.cpp

@@ -160,10 +160,6 @@ const Option OptTable::getOption(OptSpecifier Opt) const {
   return Option(&getInfo(id), this);
 }
 
-bool OptTable::isOptionHelpHidden(OptSpecifier id) const {
-  return getInfo(id).Flags & HelpHidden;
-}
-
 static bool isInput(const llvm::StringSet<> &Prefixes, StringRef Arg) {
   if (Arg == "-")
     return true;
@@ -346,8 +342,16 @@ static const char *getOptionHelpGroup(const OptTable &Opts, OptSpecifier Id) {
   return getOptionHelpGroup(Opts, GroupID);
 }
 
-void OptTable::PrintHelp(raw_ostream &OS, const char *Name,
-                         const char *Title, bool ShowHidden) const {
+void OptTable::PrintHelp(raw_ostream &OS, const char *Name, const char *Title,
+                         bool ShowHidden) const {
+  PrintHelp(OS, Name, Title, /*Include*/ 0, /*Exclude*/
+            (ShowHidden ? 0 : HelpHidden));
+}
+
+
+void OptTable::PrintHelp(raw_ostream &OS, const char *Name, const char *Title,
+                         unsigned FlagsToInclude,
+                         unsigned FlagsToExclude) const {
   OS << "OVERVIEW: " << Title << "\n";
   OS << '\n';
   OS << "USAGE: " << Name << " [options] <inputs>\n";
@@ -366,7 +370,10 @@ void OptTable::PrintHelp(raw_ostream &OS, const char *Name,
     if (getOptionKind(Id) == Option::GroupClass)
       continue;
 
-    if (!ShowHidden && isOptionHelpHidden(Id))
+    unsigned Flags = getInfo(Id).Flags;
+    if (FlagsToInclude && !(Flags & FlagsToInclude))
+      continue;
+    if (Flags & FlagsToExclude)
       continue;
 
     if (const char *Text = getOptionHelpText(Id)) {