Remove NormalizerRetTy and use the decltype of the KeyPath instead

[jansvoboda11]

Summary

Depends on D83315

[Bigcheese]

lgtm

[jansvoboda11]

Taking over this patch, as Daniel is no longer involved.

clang/include/clang/Driver/Options.td

 let Flags = [CC1Option, CC1AsOption, NoDriverOption] in {
 
 def target_cpu : Separate<["-"], "target-cpu">,
   HelpText<"Target a specific cpu type">;
 def target_feature : Separate<["-"], "target-feature">,
   HelpText<"Target specific attributes">;
 def triple : Separate<["-"], "triple">,
   HelpText<"Specify target triple (e.g. i686-apple-darwin9)">,
-  MarshallingInfoString<"TargetOpts->Triple", "llvm::sys::getDefaultTargetTriple()", "std::string">,
+  MarshallingInfoString<"TargetOpts->Triple", "llvm::sys::getDefaultTargetTriple()">,
   AlwaysEmit, Normalizer<"normalizeTriple">, DenormalizeString;
 def target_abi : Separate<["-"], "target-abi">,
   HelpText<"Target a particular ABI type">;
 def target_sdk_version_EQ : Joined<["-"], "target-sdk-version=">,
   HelpText<"The version of target SDK used for compilation">;
 
 }
 

 def msave_temp_labels : Flag<["-"], "msave-temp-labels">,
   HelpText<"Save temporary labels in the symbol table. "
            "Note this may change .s semantics and shouldn't generally be used "
            "on compiler-generated code.">;
 def mrelocation_model : Separate<["-"], "mrelocation-model">,
   HelpText<"The relocation model to use">, Values<"static,pic,ropi,rwpi,ropi-rwpi,dynamic-no-pic">,
   NormalizedValuesScope<"llvm::Reloc">,
   NormalizedValues<["Static", "PIC_", "ROPI", "RWPI", "ROPI_RWPI", "DynamicNoPIC"]>,
-  MarshallingInfoString<"CodeGenOpts.RelocationModel", "PIC_", "llvm::Reloc::Model">,
+  MarshallingInfoString<"CodeGenOpts.RelocationModel", "PIC_">,
   AutoNormalizeEnum;
 def fno_math_builtin : Flag<["-"], "fno-math-builtin">,
   HelpText<"Disable implicit builtin knowledge of math functions">;
 }
 
 def disable_llvm_verifier : Flag<["-"], "disable-llvm-verifier">,
   HelpText<"Don't run the LLVM IR verifier pass">;
 def disable_llvm_passes : Flag<["-"], "disable-llvm-passes">,

 
 def mt_migrate_directory : Separate<["-"], "mt-migrate-directory">,
   HelpText<"Directory for temporary files produced during ARC or ObjC migration">;
 
 def arcmt_action_EQ : Joined<["-"], "arcmt-action=">, Flags<[CC1Option, NoDriverOption]>,
   HelpText<"The ARC migration action to take">, Values<"check,modify,migrate">,
   NormalizedValuesScope<"FrontendOptions">,
   NormalizedValues<["ARCMT_Check", "ARCMT_Modify", "ARCMT_Migrate"]>,
-  MarshallingInfoString<"FrontendOpts.ARCMTAction", "ARCMT_None", "unsigned">,
+  MarshallingInfoString<"FrontendOpts.ARCMTAction", "ARCMT_None">,
   AutoNormalizeEnumJoined;
 
 def opt_record_file : Separate<["-"], "opt-record-file">,
   HelpText<"File name to use for YAML optimization record output">;
 def opt_record_passes : Separate<["-"], "opt-record-passes">,
   HelpText<"Only record remark information for passes whose names match the given regular expression">;
 def opt_record_format : Separate<["-"], "opt-record-format">,
   HelpText<"The format used for serializing remarks (default: YAML)">;

clang/lib/Frontend/CompilerInvocation.cpp

static Optional<std::string> normalizeTriple(OptSpecifier Opt, int TableIndex,
   auto *Arg = Args.getLastArg(Opt);
   if (!Arg)
     return None;
   return llvm::Triple::normalize(Arg->getValue());
 }
 
 template <typename T, typename U>
 static T mergeForwardValue(T KeyPath, U Value) {
-  return static_cast<T>(Value);
+  return Value;
 }
 
 template <typename T, typename U> static T mergeMaskValue(T KeyPath, U Value) {
   return KeyPath | Value;
 }
 
 template <typename T> static T extractForwardValue(T KeyPath) {
   return KeyPath;
static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
   }
 }
 
 bool CompilerInvocation::parseSimpleArgs(const ArgList &Args,
                                          DiagnosticsEngine &Diags) {
 #define OPTION_WITH_MARSHALLING(                                               \
     PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
     HELPTEXT, METAVAR, VALUES, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,  \
-    TYPE, NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX)            \
+    NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX)                  \
   {                                                                            \
     if (auto MaybeValue = NORMALIZER(OPT_##ID, TABLE_INDEX, Args, Diags))      \
-      this->KEYPATH = MERGER(this->KEYPATH, static_cast<TYPE>(*MaybeValue));   \
+      this->KEYPATH = MERGER(                                                  \
+          this->KEYPATH, static_cast<decltype(this->KEYPATH)>(*MaybeValue));   \
     else                                                                       \
       this->KEYPATH = MERGER(this->KEYPATH, DEFAULT_VALUE);                    \
   }
 
 #define OPTION_WITH_MARSHALLING_BOOLEAN(                                       \
     PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
     HELPTEXT, METAVAR, VALUES, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,  \
-    TYPE, NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX, NEG_ID,    \
+    NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX, NEG_ID,          \
     NEG_SPELLING)                                                              \
   {                                                                            \
     if (auto MaybeValue =                                                      \
             NORMALIZER(OPT_##ID, OPT_##NEG_ID, TABLE_INDEX, Args, Diags))      \
-      this->KEYPATH = MERGER(this->KEYPATH, static_cast<TYPE>(*MaybeValue));   \
+      this->KEYPATH = MERGER(                                                  \
+          this->KEYPATH, static_cast<decltype(this->KEYPATH)>(*MaybeValue));   \
     else                                                                       \
       this->KEYPATH = MERGER(this->KEYPATH, DEFAULT_VALUE);                    \
   }
 
 #include "clang/Driver/Options.inc"
 #undef OPTION_WITH_MARSHALLING_BOOLEAN
 #undef OPTION_WITH_MARSHALLING
   return true;
#include "clang/Basic/LangOptions.def"
   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
 }
 
 void CompilerInvocation::generateCC1CommandLine(
     SmallVectorImpl<const char *> &Args, StringAllocator SA) const {
 #define OPTION_WITH_MARSHALLING(                                               \
     PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
     HELPTEXT, METAVAR, VALUES, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,  \
-    TYPE, NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX)            \
+    NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX)                  \
   if ((FLAGS)&options::CC1Option) {                                            \
     const auto &Extracted = EXTRACTOR(this->KEYPATH);                          \
     if (ALWAYS_EMIT || Extracted != DEFAULT_VALUE)                             \
       DENORMALIZER(Args, SPELLING, SA, TABLE_INDEX, Extracted);                \
   }
 
 #define OPTION_WITH_MARSHALLING_BOOLEAN(                                       \
     PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
     HELPTEXT, METAVAR, VALUES, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,  \
-    TYPE, NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX, NEG_ID,    \
+    NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX, NEG_ID,          \
     NEG_SPELLING)                                                              \
   if ((FLAGS)&options::CC1Option) {                                            \
     const auto &Extracted = EXTRACTOR(this->KEYPATH);                          \
     if (ALWAYS_EMIT || Extracted != DEFAULT_VALUE)                             \
       DENORMALIZER(Args, SPELLING, NEG_SPELLING, SA, TABLE_INDEX, Extracted);  \
   }
 
 #include "clang/Driver/Options.inc"

llvm/include/llvm/Option/OptParser.td

 // Helpers for defining marshalling information.
 
 class MarshallingInfo<code keypath, code defaultvalue> {
   string MarshallingInfoKind = "Default";
   code KeyPath = keypath;
   code DefaultValue = defaultvalue;
 }
 
-class MarshallingInfoString<code keypath, code defaultvalue, code normalizerretty>
-  : MarshallingInfo<keypath, defaultvalue> {
-  code NormalizerRetTy = normalizerretty;
-}
+class MarshallingInfoString<code keypath, code defaultvalue>
+  : MarshallingInfo<keypath, defaultvalue> {}
 
-class MarshallingInfoFlag<code keypath, code defaultvalue, code ty="unsigned">
+class MarshallingInfoFlag<code keypath, code defaultvalue>
   : MarshallingInfo<keypath, defaultvalue> {
-  code NormalizerRetTy = ty;
   code Normalizer = "normalizeSimpleFlag";
   code Denormalizer = "denormalizeSimpleFlag";
 }
 
-class MarshallingInfoBitfieldFlag<code keypath, code value> : MarshallingInfoFlag<keypath, "0u", "unsigned"> {
+class MarshallingInfoBitfieldFlag<code keypath, code value> : MarshallingInfoFlag<keypath, "0u"> {
   code Normalizer = "(normalizeFlagToValue<unsigned, "#value#">)";
   code ValueMerger = "mergeMaskValue";
   code ValueExtractor = "(extractMaskValue<unsigned, decltype("#value#"), "#value#">)";
 }
 
 class MarshallingInfoBooleanFlag<code keypath, code defaultvalue, Option negopt>
   : MarshallingInfoFlag<keypath, defaultvalue> {
   bit ShouldAlwaysEmit = 1;

llvm/utils/TableGen/OptParserEmitter.cpp

public:
   using Ptr = std::unique_ptr<MarshallingInfo>;
 
   const char *MacroName;
   const Record &R;
   bool ShouldAlwaysEmit;
   StringRef KeyPath;
   StringRef DefaultValue;
   StringRef NormalizedValuesScope;
-  StringRef NormalizerRetTy;
   StringRef Normalizer;
   StringRef Denormalizer;
   StringRef ValueMerger;
   StringRef ValueExtractor;
   int TableIndex = -1;
   std::vector<StringRef> Values;
   std::vector<StringRef> NormalizedValues;
   std::string ValueTableName;
virtual void emit(raw_ostream &OS) const {
     write_cstring(OS, StringRef(getOptionSpelling(R)));
     OS << ", ";
     OS << ShouldAlwaysEmit;
     OS << ", ";
     OS << KeyPath;
     OS << ", ";
     emitScopedNormalizedValue(OS, DefaultValue);
     OS << ", ";
-    OS << NormalizerRetTy;
-    OS << ", ";
     OS << Normalizer;
     OS << ", ";
     OS << Denormalizer;
     OS << ", ";
     OS << ValueMerger;
     OS << ", ";
     OS << ValueExtractor;
     OS << ", ";
void emit(raw_ostream &OS) const override {
     OS << ", ";
     write_cstring(OS, getOptionSpelling(NegOption));
   }
 };
 
 static MarshallingInfo::Ptr createMarshallingInfo(const Record &R) {
   assert(!isa<UnsetInit>(R.getValueInit("KeyPath")) &&
          !isa<UnsetInit>(R.getValueInit("DefaultValue")) &&
-         !isa<UnsetInit>(R.getValueInit("NormalizerRetTy")) &&
          !isa<UnsetInit>(R.getValueInit("ValueMerger")) &&
-         "MarshallingInfo must have a type");
+         "MarshallingInfo must have a provide a keypath, default value and a "
+         "value merger");
 
   MarshallingInfo::Ptr Ret;
   if (Record *MaybeNegOption = R.getValueAsOptionalDef("NegOption")) {
     Ret = std::make_unique<MarshallingInfoBooleanFlag>(R, *MaybeNegOption);
   } else {
     Ret = std::make_unique<MarshallingInfo>(R);
   }
 
   Ret->ShouldAlwaysEmit = R.getValueAsBit("ShouldAlwaysEmit");
   Ret->KeyPath = R.getValueAsString("KeyPath");
   Ret->DefaultValue = R.getValueAsString("DefaultValue");
   Ret->NormalizedValuesScope = R.getValueAsString("NormalizedValuesScope");
-  Ret->NormalizerRetTy = R.getValueAsString("NormalizerRetTy");
 
   Ret->Normalizer = R.getValueAsString("Normalizer");
   Ret->Denormalizer = R.getValueAsString("Denormalizer");
   Ret->ValueMerger = R.getValueAsString("ValueMerger");
   Ret->ValueExtractor = R.getValueAsString("ValueExtractor");
 
   if (!isa<UnsetInit>(R.getValueInit("NormalizedValues"))) {
     assert(!isa<UnsetInit>(R.getValueInit("Values")) &&