val.diff

diff --git a/clang/include/clang/Driver/Options.h b/clang/include/clang/Driver/Options.h
index 57e4452..382e618 100644
--- a/clang/include/clang/Driver/Options.h
+++ b/clang/include/clang/Driver/Options.h
@@ -40,7 +40,7 @@ enum ClangFlags {
 enum ID {
     OPT_INVALID = 0, // This is not an option ID.
 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
-               HELPTEXT, METAVAR) OPT_##ID,
+               HELPTEXT, METAVAR, VALUE) OPT_##ID,
 #include "clang/Driver/Options.inc"
     LastOption
 #undef OPTION
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 4f1ea08..0dc873d 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2195,7 +2195,7 @@ def std_default_EQ : Joined<["-"], "std-default=">;
 def std_EQ : Joined<["-", "--"], "std=">, Flags<[CC1Option]>,
   Group<CompileOnly_Group>, HelpText<"Language standard to compile for">;
 def stdlib_EQ : Joined<["-", "--"], "stdlib=">, Flags<[CC1Option]>,
-  HelpText<"C++ standard library to use">;
+  HelpText<"C++ standard library to use">, Value<"libc++,libstdc++,platform">;
 def sub__library : JoinedOrSeparate<["-"], "sub_library">;
 def sub__umbrella : JoinedOrSeparate<["-"], "sub_umbrella">;
 def system_header_prefix : Joined<["--"], "system-header-prefix=">,
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index bec4bf4..05b47dc 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1219,7 +1219,13 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
   if (Arg *A = C.getArgs().getLastArg(options::OPT_autocomplete)) {
     // Print out all options that start with a given argument. This is used for
     // shell autocompletion.
-    llvm::outs() << llvm::join(Opts->findByPrefix(A->getValue()), " ") << '\n';
+    StringRef S = A->getValue();
+    SmallVector<StringRef, 8> Split;
+    S.split(Split, ",", -1, false);
+    std::vector<std::string> V = Opts->findByPrefix(Split[0]);
+    if (V.empty())
+      V = Opts->findByValue(Split);
+    llvm::outs() << llvm::join(V, " ") << '\n';
     return false;
   }
 
diff --git a/clang/lib/Driver/DriverOptions.cpp b/clang/lib/Driver/DriverOptions.cpp
index 6a74109..aae7660 100644
--- a/clang/lib/Driver/DriverOptions.cpp
+++ b/clang/lib/Driver/DriverOptions.cpp
@@ -22,9 +22,9 @@ using namespace llvm::opt;
 
 static const OptTable::Info InfoTable[] = {
 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
-               HELPTEXT, METAVAR)   \
+               HELPTEXT, METAVAR, VALUE)   \
   { PREFIX, NAME, HELPTEXT, METAVAR, OPT_##ID, Option::KIND##Class, PARAM, \
-    FLAGS, OPT_##GROUP, OPT_##ALIAS, ALIASARGS },
+    FLAGS, OPT_##GROUP, OPT_##ALIAS, ALIASARGS, VALUE },
 #include "clang/Driver/Options.inc"
 #undef OPTION
 };
diff --git a/clang/test/Driver/autocomplete.c b/clang/test/Driver/autocomplete.c
index 94649f2..96e539e 100644
--- a/clang/test/Driver/autocomplete.c
+++ b/clang/test/Driver/autocomplete.c
@@ -4,3 +4,5 @@
 // STD: -std={{.*}}-stdlib=
 // RUN: %clang --autocomplete=foo | not FileCheck %s -check-prefix=NONE
 // NONE: foo
+// RUN: %clang --autocomplete=l,=,-stdlib | FileCheck %s -check-prefix=STDLIB
+// STDLIB: libc++ libstdc++
diff --git a/clang/utils/bash-autocomplete.sh b/clang/utils/bash-autocomplete.sh
index a906712..3bf3730 100644
--- a/clang/utils/bash-autocomplete.sh
+++ b/clang/utils/bash-autocomplete.sh
@@ -4,11 +4,17 @@ _clang()
   local cur prev words cword flags
   _init_completion -n : || return
 
-  flags=$( clang --autocomplete="$cur" )
+  arg=""
+  for (( i = $cword; i >= 1; i-- )) ;
+  do
+    arg="$arg""${COMP_WORDS[$i]},"
+  done
+
+  flags=$( clang --autocomplete="$arg" )
   if [[ "$flags" == "" || "$cur" == "" ]]; then
     _filedir
   else
     COMPREPLY=( $( compgen -W "$flags" -- "$cur" ) )
   fi
-} 
+}
 complete -F _clang clang
diff --git a/lld/COFF/Driver.h b/lld/COFF/Driver.h
index ad72562..407d462 100644
--- a/lld/COFF/Driver.h
+++ b/lld/COFF/Driver.h
@@ -185,7 +185,7 @@ void runMSVCLinker(std::string Rsp, ArrayRef<StringRef> Objects);
 // Create enum with OPT_xxx values for each option in Options.td
 enum {
   OPT_INVALID = 0,
-#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11) OPT_##ID,
+#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
 #include "Options.inc"
 #undef OPTION
 };
diff --git a/lld/COFF/DriverUtils.cpp b/lld/COFF/DriverUtils.cpp
index 252590c..83bcb29 100644
--- a/lld/COFF/DriverUtils.cpp
+++ b/lld/COFF/DriverUtils.cpp
@@ -659,10 +659,10 @@ void runMSVCLinker(std::string Rsp, ArrayRef<StringRef> Objects) {
 
 // Create table mapping all options defined in Options.td
 static const llvm::opt::OptTable::Info infoTable[] = {
-#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10)    \
+#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10, X11)       \
   {                                                                    \
     X1, X2, X9, X10, OPT_##ID, llvm::opt::Option::KIND##Class, X8, X7, \
-    OPT_##GROUP, OPT_##ALIAS, X6                                       \
+    OPT_##GROUP, OPT_##ALIAS, X6, X11 \
   },
 #include "Options.inc"
 #undef OPTION
diff --git a/lld/ELF/Driver.h b/lld/ELF/Driver.h
index af88341..076dda7 100644
--- a/lld/ELF/Driver.h
+++ b/lld/ELF/Driver.h
@@ -58,7 +58,7 @@ public:
 // Create enum with OPT_xxx values for each option in Options.td
 enum {
   OPT_INVALID = 0,
-#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11) OPT_##ID,
+#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
 #include "Options.inc"
 #undef OPTION
 };
diff --git a/lld/ELF/DriverUtils.cpp b/lld/ELF/DriverUtils.cpp
index f4eadee..9a38c78 100644
--- a/lld/ELF/DriverUtils.cpp
+++ b/lld/ELF/DriverUtils.cpp
@@ -42,9 +42,9 @@ using namespace lld::elf;
 
 // Create table mapping all options defined in Options.td
 static const opt::OptTable::Info OptInfo[] = {
-#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10)            \
+#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10, X11)       \
   {X1, X2, X9,          X10,         OPT_##ID, opt::Option::KIND##Class,       \
-   X8, X7, OPT_##GROUP, OPT_##ALIAS, X6},
+   X8, X7, OPT_##GROUP, OPT_##ALIAS, X6,       X11},
 #include "Options.inc"
 #undef OPTION
 };
diff --git a/lld/lib/Driver/DarwinLdDriver.cpp b/lld/lib/Driver/DarwinLdDriver.cpp
index 9b4aede..eb1e178 100644
--- a/lld/lib/Driver/DarwinLdDriver.cpp
+++ b/lld/lib/Driver/DarwinLdDriver.cpp
@@ -62,7 +62,7 @@ namespace {
 enum {
   OPT_INVALID = 0,
 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
-               HELP, META) \
+               HELP, META, VALUE) \
           OPT_##ID,
 #include "DarwinLdOptions.inc"
 #undef OPTION
@@ -76,9 +76,9 @@ enum {
 // Create table mapping all options defined in DarwinLdOptions.td
 static const llvm::opt::OptTable::Info infoTable[] = {
 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
-               HELPTEXT, METAVAR)   \
+               HELPTEXT, METAVAR, VALUE)   \
   { PREFIX, NAME, HELPTEXT, METAVAR, OPT_##ID, llvm::opt::Option::KIND##Class, \
-    PARAM, FLAGS, OPT_##GROUP, OPT_##ALIAS, ALIASARGS },
+    PARAM, FLAGS, OPT_##GROUP, OPT_##ALIAS, ALIASARGS, VALUE },
 #include "DarwinLdOptions.inc"
 #undef OPTION
 };
diff --git a/llvm/include/llvm/Option/OptParser.td b/llvm/include/llvm/Option/OptParser.td
index 4da86f0..815474d 100644
--- a/llvm/include/llvm/Option/OptParser.td
+++ b/llvm/include/llvm/Option/OptParser.td
@@ -92,6 +92,7 @@ class Option<list<string> prefixes, string name, OptionKind kind> {
   int NumArgs = 0;
   string HelpText = ?;
   string MetaVarName = ?;
+  string Value = ?;
   list<OptionFlag> Flags = [];
   OptionGroup Group = ?;
   Option Alias = ?;
@@ -126,6 +127,7 @@ class Flags<list<OptionFlag> flags> { list<OptionFlag> Flags = flags; }
 class Group<OptionGroup group> { OptionGroup Group = group; }
 class HelpText<string text> { string HelpText = text; }
 class MetaVarName<string name> { string MetaVarName = name; }
+class Value<string value> { string Value = value; }
 
 // Predefined options.
 
diff --git a/llvm/include/llvm/Option/OptTable.h b/llvm/include/llvm/Option/OptTable.h
index 8a323a2..48437cb 100644
--- a/llvm/include/llvm/Option/OptTable.h
+++ b/llvm/include/llvm/Option/OptTable.h
@@ -46,6 +46,7 @@ public:
     unsigned short GroupID;
     unsigned short AliasID;
     const char *AliasArgs;
+    const char *Value;
   };
 
 private:
@@ -113,6 +114,7 @@ public:
     return getInfo(id).MetaVar;
   }
 
+  std::vector<std::string> findByValue(const SmallVectorImpl<StringRef> &Command) const;
   /// Find flags from OptTable which starts with Cur.
   ///
   /// \param [in] Cur - String prefix that all returned flags need
diff --git a/llvm/include/llvm/Option/Option.h b/llvm/include/llvm/Option/Option.h
index 139f281..f6df35f 100644
--- a/llvm/include/llvm/Option/Option.h
+++ b/llvm/include/llvm/Option/Option.h
@@ -49,6 +49,7 @@ public:
     UnknownClass,
     FlagClass,
     JoinedClass,
+    ValueClass,
     SeparateClass,
     RemainingArgsClass,
     RemainingArgsJoinedClass,
@@ -147,6 +148,7 @@ public:
     case CommaJoinedClass:
       return RenderCommaJoinedStyle;
     case FlagClass:
+    case ValueClass:
     case SeparateClass:
     case MultiArgClass:
     case JoinedOrSeparateClass:
diff --git a/llvm/lib/Option/OptTable.cpp b/llvm/lib/Option/OptTable.cpp
index b00d21e..a89a2e0 100644
--- a/llvm/lib/Option/OptTable.cpp
+++ b/llvm/lib/Option/OptTable.cpp
@@ -186,6 +186,30 @@ static unsigned matchOption(const OptTable::Info *I, StringRef Str,
   return 0;
 }
 
+std::vector<std::string>
+OptTable::findByValue(const SmallVectorImpl<StringRef> &Command) const {
+  if (Command.size() <= 1)
+    return {};
+
+  std::vector<std::string> Ret;
+  for (const Info &In : OptionInfos.slice(FirstSearchableIndex)) {
+    if (!In.Value)
+      continue;
+    std::string S = "-" + std::string(In.Name);
+    std::string C = (Command[1] == "=") ? 
+      std::string(Command[2]) + "=" : std::string(Command[1]);
+    if (S != C)
+      continue;
+
+    SmallVector<StringRef, 8> Values;
+    StringRef(In.Value).split(Values, ",", -1, false);
+    for (StringRef Val : Values)
+      if (Val.startswith(Command[0]))
+        Ret.push_back(Val);
+  }
+  return Ret;
+}
+
 std::vector<std::string> OptTable::findByPrefix(StringRef Cur) const {
   std::vector<std::string> Ret;
   for (const Info &In : OptionInfos.slice(FirstSearchableIndex)) {
@@ -328,6 +352,9 @@ static std::string getOptionHelpName(const OptTable &Opts, OptSpecifier Id) {
   case Option::FlagClass:
     break;
 
+  case Option::ValueClass:
+    break;
+
   case Option::SeparateClass: case Option::JoinedOrSeparateClass:
   case Option::RemainingArgsClass: case Option::RemainingArgsJoinedClass:
     Name += ' ';
diff --git a/llvm/lib/Option/Option.cpp b/llvm/lib/Option/Option.cpp
index 736b939..22b8f0e 100644
--- a/llvm/lib/Option/Option.cpp
+++ b/llvm/lib/Option/Option.cpp
@@ -45,6 +45,7 @@ void Option::print(raw_ostream &O) const {
     P(UnknownClass);
     P(FlagClass);
     P(JoinedClass);
+    P(ValueClass);
     P(SeparateClass);
     P(CommaJoinedClass);
     P(MultiArgClass);
diff --git a/llvm/lib/ToolDrivers/llvm-lib/LibDriver.cpp b/llvm/lib/ToolDrivers/llvm-lib/LibDriver.cpp
index 3bae382..58298ba 100644
--- a/llvm/lib/ToolDrivers/llvm-lib/LibDriver.cpp
+++ b/llvm/lib/ToolDrivers/llvm-lib/LibDriver.cpp
@@ -30,7 +30,7 @@ namespace {
 
 enum {
   OPT_INVALID = 0,
-#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11) OPT_##ID,
+#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
 #include "Options.inc"
 #undef OPTION
 };
@@ -40,10 +40,10 @@ enum {
 #undef PREFIX
 
 static const llvm::opt::OptTable::Info infoTable[] = {
-#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10)    \
+#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10, X11)       \
   {                                                                    \
     X1, X2, X9, X10, OPT_##ID, llvm::opt::Option::KIND##Class, X8, X7, \
-    OPT_##GROUP, OPT_##ALIAS, X6                                       \
+    OPT_##GROUP, OPT_##ALIAS, X6, X11 \
   },
 #include "Options.inc"
 #undef OPTION
diff --git a/llvm/tools/llvm-cvtres/llvm-cvtres.cpp b/llvm/tools/llvm-cvtres/llvm-cvtres.cpp
index f03e0b7..d711044 100644
--- a/llvm/tools/llvm-cvtres/llvm-cvtres.cpp
+++ b/llvm/tools/llvm-cvtres/llvm-cvtres.cpp
@@ -31,7 +31,7 @@ namespace {
 enum ID {
   OPT_INVALID = 0, // This is not an option ID.
 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
-               HELPTEXT, METAVAR)                                              \
+               HELPTEXT, METAVAR, VALUE)                                       \
   OPT_##ID,
 #include "Opts.inc"
 #undef OPTION
@@ -43,12 +43,12 @@ enum ID {
 
 static const opt::OptTable::Info InfoTable[] = {
 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
-               HELPTEXT, METAVAR)                                              \
+               HELPTEXT, METAVAR, VALUE)                                       \
   {                                                                            \
       PREFIX,      NAME,     HELPTEXT,                                         \
       METAVAR,     OPT_##ID, opt::Option::KIND##Class,                         \
       PARAM,       FLAGS,    OPT_##GROUP,                                      \
-      OPT_##ALIAS, ALIASARGS},
+      OPT_##ALIAS, ALIASARGS, VALUE },
 #include "Opts.inc"
 #undef OPTION
 };
diff --git a/llvm/unittests/Option/OptionParsingTest.cpp b/llvm/unittests/Option/OptionParsingTest.cpp
index 8630ff1..ede5127 100644
--- a/llvm/unittests/Option/OptionParsingTest.cpp
+++ b/llvm/unittests/Option/OptionParsingTest.cpp
@@ -19,7 +19,8 @@ using namespace llvm::opt;
 enum ID {
   OPT_INVALID = 0, // This is not an option ID.
 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
-               HELPTEXT, METAVAR) OPT_##ID,
+               HELPTEXT, METAVAR, VALUE)                                      \
+  OPT_##ID,
 #include "Opts.inc"
   LastOption
 #undef OPTION
@@ -37,9 +38,9 @@ enum OptionFlags {
 
 static const OptTable::Info InfoTable[] = {
 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \
-               HELPTEXT, METAVAR)   \
+               HELPTEXT, METAVAR, VALUE)                                      \
   { PREFIX, NAME, HELPTEXT, METAVAR, OPT_##ID, Option::KIND##Class, PARAM, \
-    FLAGS, OPT_##GROUP, OPT_##ALIAS, ALIASARGS },
+    FLAGS, OPT_##GROUP, OPT_##ALIAS, ALIASARGS, VALUE },
 #include "Opts.inc"
 #undef OPTION
 };
diff --git a/llvm/utils/TableGen/OptParserEmitter.cpp b/llvm/utils/TableGen/OptParserEmitter.cpp
index c1b5e65..5e16ef2 100644
--- a/llvm/utils/TableGen/OptParserEmitter.cpp
+++ b/llvm/utils/TableGen/OptParserEmitter.cpp
@@ -194,6 +194,8 @@ void EmitOptParser(RecordKeeper &Records, raw_ostream &OS) {
       OS << ", nullptr";
 
     // The option meta-variable name (unused).
+    OS << ", nullptr";
+
     OS << ", nullptr)\n";
   }
   OS << "\n";
@@ -283,6 +285,12 @@ void EmitOptParser(RecordKeeper &Records, raw_ostream &OS) {
     else
       OS << "nullptr";
 
+    OS << ", ";
+    if (!isa<UnsetInit>(R.getValueInit("Value")))
+      write_cstring(OS, R.getValueAsString("Value"));
+    else
+      OS << "nullptr";
+
     OS << ")\n";
   }
   OS << "#endif // OPTION\n";