Replace variadic operator function pointer with an enum value.

[sbenza]

Summary

Replace variadic operator function pointer with an enum value.
Hiding the implementation of the variadic matcher will allow to specialize them for the operation performed.
In particular, it will allow for a more efficient allOf() matcher.

[klimek]

lib/ASTMatchers/ASTMatchersInternal.cpp

127

Please add a comment why we can't use virtual dispatch here.

[sbenza]

lib/ASTMatchers/ASTMatchersInternal.cpp

127

Virtual dispatch how?
You mean a different class for each enum value? (instead of a common class with a function ptr argument)
This is what we will have in the next change.
I just wanted to separate the refactor that changes a lot of files but has no behavior change (this cl), from the improvement that changes only this file and speeds up runtime.

[sbenza]

Are you waiting for an action on my part?

[klimek]

No, I had a draft containing "ah, then lgtm" which I apparently forgot to
hit "send" on.

[sbenza]

Closed by commit rL222432 (authored by @sbenza).

include/clang/ASTMatchers/ASTMatchers.h

 ///                     has(fieldDecl(hasName("b")).bind("v"))))
 /// \endcode
 /// will generate two results binding "v", the first of which binds
 /// the field declaration of \c a, the second the field declaration of
 /// \c b.
 ///
 /// Usable as: Any Matcher
 const internal::VariadicOperatorMatcherFunc<2, UINT_MAX> eachOf = {
-  internal::EachOfVariadicOperator
+  internal::DynTypedMatcher::VO_EachOf
 };
 
 /// \brief Matches if any of the given matchers matches.
 ///
 /// Usable as: Any Matcher
 const internal::VariadicOperatorMatcherFunc<2, UINT_MAX> anyOf = {
-  internal::AnyOfVariadicOperator
+  internal::DynTypedMatcher::VO_AnyOf
 };
 
 /// \brief Matches if all given matchers match.
 ///
 /// Usable as: Any Matcher
 const internal::VariadicOperatorMatcherFunc<2, UINT_MAX> allOf = {
-  internal::AllOfVariadicOperator
+  internal::DynTypedMatcher::VO_AllOf
 };
 
 /// \brief Matches sizeof (C99), alignof (C++11) and vec_step (OpenCL)
 ///
 /// Given
 /// \code
 ///   Foo x = bar;
 ///   int y = sizeof(x) + alignof(x);

 /// Example matches Y (matcher = recordDecl(unless(hasName("X"))))
 /// \code
 ///   class X {};
 ///   class Y {};
 /// \endcode
 ///
 /// Usable as: Any Matcher
 const internal::VariadicOperatorMatcherFunc<1, 1> unless = {
-  internal::NotUnaryOperator
+  internal::DynTypedMatcher::VO_UnaryNot
 };
 
 /// \brief Matches a node if the declaration associated with that node
 /// matches the given matcher.
 ///
 /// The associated declaration is:
 /// - for type nodes, the declaration of the underlying type
 /// - for CallExpr, the declaration of the callee

include/clang/ASTMatchers/ASTMatchersInternal.h

public:
   /// \brief Takes ownership of the provided implementation pointer.
   template <typename T>
   DynTypedMatcher(MatcherInterface<T> *Implementation)
       : AllowBind(false),
         SupportedKind(ast_type_traits::ASTNodeKind::getFromNodeKind<T>()),
         RestrictKind(SupportedKind), Implementation(Implementation) {}
 
   /// \brief Construct from a variadic function.
-  typedef bool (*VariadicOperatorFunction)(
-      const ast_type_traits::DynTypedNode DynNode, ASTMatchFinder *Finder,
-      BoundNodesTreeBuilder *Builder, ArrayRef<DynTypedMatcher> InnerMatchers);
+  enum VariadicOperator {
+    /// \brief Matches nodes for which all provided matchers match.
+    VO_AllOf,
+    /// \brief Matches nodes for which at least one of the provided matchers
+    /// matches.
+    VO_AnyOf,
+    /// \brief Matches nodes for which at least one of the provided matchers
+    /// matches, but doesn't stop at the first match.
+    VO_EachOf,
+    /// \brief Matches nodes that do not match the provided matcher.
+    ///
+    /// Uses the variadic matcher interface, but fails if
+    /// InnerMatchers.size() != 1.
+    VO_UnaryNot
+  };
   static DynTypedMatcher
-  constructVariadic(VariadicOperatorFunction Func,
+  constructVariadic(VariadicOperator Op,
                     std::vector<DynTypedMatcher> InnerMatchers);
 
   /// \brief Get a "true" matcher for \p NodeKind.
   ///
   /// It only checks that the node is of the right kind.
   static DynTypedMatcher trueMatcher(ast_type_traits::ASTNodeKind NodeKind);
 
   void setAllowBind(bool AB) { AllowBind = AB; }

 
 /// \brief VariadicOperatorMatcher related types.
 /// @{
 
 /// \brief "No argument" placeholder to use as template paratemers.
 struct VariadicOperatorNoArg {};
 
 /// \brief Polymorphic matcher object that uses a \c
-/// DynTypedMatcher::VariadicOperatorFunction operator.
+/// DynTypedMatcher::VariadicOperator operator.
 ///
 /// Input matchers can have any type (including other polymorphic matcher
 /// types), and the actual Matcher<T> is generated on demand with an implicit
 /// coversion operator.
 template <typename P1, typename P2 = VariadicOperatorNoArg,
           typename P3 = VariadicOperatorNoArg,
           typename P4 = VariadicOperatorNoArg,
           typename P5 = VariadicOperatorNoArg,
           typename P6 = VariadicOperatorNoArg,
           typename P7 = VariadicOperatorNoArg,
           typename P8 = VariadicOperatorNoArg,
           typename P9 = VariadicOperatorNoArg>
 class VariadicOperatorMatcher {
 public:
-  VariadicOperatorMatcher(DynTypedMatcher::VariadicOperatorFunction Func,
+  VariadicOperatorMatcher(DynTypedMatcher::VariadicOperator Op,
                           const P1 &Param1,
                           const P2 &Param2 = VariadicOperatorNoArg(),
                           const P3 &Param3 = VariadicOperatorNoArg(),
                           const P4 &Param4 = VariadicOperatorNoArg(),
                           const P5 &Param5 = VariadicOperatorNoArg(),
                           const P6 &Param6 = VariadicOperatorNoArg(),
                           const P7 &Param7 = VariadicOperatorNoArg(),
                           const P8 &Param8 = VariadicOperatorNoArg(),
                           const P9 &Param9 = VariadicOperatorNoArg())
-      : Func(Func), Param1(Param1), Param2(Param2), Param3(Param3),
+      : Op(Op), Param1(Param1), Param2(Param2), Param3(Param3),
         Param4(Param4), Param5(Param5), Param6(Param6), Param7(Param7),
         Param8(Param8), Param9(Param9) {}
 
   template <typename T> operator Matcher<T>() const {
     std::vector<DynTypedMatcher> Matchers;
     addMatcher<T>(Param1, Matchers);
     addMatcher<T>(Param2, Matchers);
     addMatcher<T>(Param3, Matchers);
     addMatcher<T>(Param4, Matchers);
     addMatcher<T>(Param5, Matchers);
     addMatcher<T>(Param6, Matchers);
     addMatcher<T>(Param7, Matchers);
     addMatcher<T>(Param8, Matchers);
     addMatcher<T>(Param9, Matchers);
-    return DynTypedMatcher::constructVariadic(Func, std::move(Matchers))
+    return DynTypedMatcher::constructVariadic(Op, std::move(Matchers))
         .template unconditionalConvertTo<T>();
   }
 
 private:
   template <typename T>
   static void addMatcher(const Matcher<T> &M,
                          std::vector<DynTypedMatcher> &Matchers) {
     Matchers.push_back(M);
   }
 
   /// \brief Overload to ignore \c VariadicOperatorNoArg arguments.
   template <typename T>
   static void addMatcher(VariadicOperatorNoArg,
                          std::vector<DynTypedMatcher> &Matchers) {}
 
-  const DynTypedMatcher::VariadicOperatorFunction Func;
+  const DynTypedMatcher::VariadicOperator Op;
   const P1 Param1;
   const P2 Param2;
   const P3 Param3;
   const P4 Param4;
   const P5 Param5;
   const P6 Param6;
   const P7 Param7;
   const P8 Param8;
   const P9 Param9;
 };
 
 /// \brief Overloaded function object to generate VariadicOperatorMatcher
 ///   objects from arbitrary matchers.
 ///
 /// It supports 1-9 argument overloaded operator(). More can be added if needed.
 template <unsigned MinCount, unsigned MaxCount>
 struct VariadicOperatorMatcherFunc {
-  DynTypedMatcher::VariadicOperatorFunction Func;
+  DynTypedMatcher::VariadicOperator Op;
 
   template <unsigned Count, typename T>
   struct EnableIfValidArity
       : public std::enable_if<MinCount <= Count && Count <= MaxCount, T> {};
 
   template <typename M1>
   typename EnableIfValidArity<1, VariadicOperatorMatcher<M1> >::type
   operator()(const M1 &P1) const {
-    return VariadicOperatorMatcher<M1>(Func, P1);
+    return VariadicOperatorMatcher<M1>(Op, P1);
   }
   template <typename M1, typename M2>
   typename EnableIfValidArity<2, VariadicOperatorMatcher<M1, M2> >::type
   operator()(const M1 &P1, const M2 &P2) const {
-    return VariadicOperatorMatcher<M1, M2>(Func, P1, P2);
+    return VariadicOperatorMatcher<M1, M2>(Op, P1, P2);
   }
   template <typename M1, typename M2, typename M3>
   typename EnableIfValidArity<3, VariadicOperatorMatcher<M1, M2, M3> >::type
   operator()(const M1 &P1, const M2 &P2, const M3 &P3) const {
-    return VariadicOperatorMatcher<M1, M2, M3>(Func, P1, P2, P3);
+    return VariadicOperatorMatcher<M1, M2, M3>(Op, P1, P2, P3);
   }
   template <typename M1, typename M2, typename M3, typename M4>
   typename EnableIfValidArity<4, VariadicOperatorMatcher<M1, M2, M3, M4> >::type
   operator()(const M1 &P1, const M2 &P2, const M3 &P3, const M4 &P4) const {
-    return VariadicOperatorMatcher<M1, M2, M3, M4>(Func, P1, P2, P3, P4);
+    return VariadicOperatorMatcher<M1, M2, M3, M4>(Op, P1, P2, P3, P4);
   }
   template <typename M1, typename M2, typename M3, typename M4, typename M5>
   typename EnableIfValidArity<
       5, VariadicOperatorMatcher<M1, M2, M3, M4, M5> >::type
   operator()(const M1 &P1, const M2 &P2, const M3 &P3, const M4 &P4,
              const M5 &P5) const {
-    return VariadicOperatorMatcher<M1, M2, M3, M4, M5>(Func, P1, P2, P3, P4,
-                                                       P5);
+    return VariadicOperatorMatcher<M1, M2, M3, M4, M5>(Op, P1, P2, P3, P4, P5);
   }
   template <typename M1, typename M2, typename M3, typename M4, typename M5,
             typename M6>
   typename EnableIfValidArity<
       6, VariadicOperatorMatcher<M1, M2, M3, M4, M5, M6> >::type
   operator()(const M1 &P1, const M2 &P2, const M3 &P3, const M4 &P4,
              const M5 &P5, const M6 &P6) const {
     return VariadicOperatorMatcher<M1, M2, M3, M4, M5, M6>(
-        Func, P1, P2, P3, P4, P5, P6);
+        Op, P1, P2, P3, P4, P5, P6);
   }
   template <typename M1, typename M2, typename M3, typename M4, typename M5,
             typename M6, typename M7>
   typename EnableIfValidArity<
       7, VariadicOperatorMatcher<M1, M2, M3, M4, M5, M6, M7> >::type
   operator()(const M1 &P1, const M2 &P2, const M3 &P3, const M4 &P4,
              const M5 &P5, const M6 &P6, const M7 &P7) const {
     return VariadicOperatorMatcher<M1, M2, M3, M4, M5, M6, M7>(
-        Func, P1, P2, P3, P4, P5, P6, P7);
+        Op, P1, P2, P3, P4, P5, P6, P7);
   }
   template <typename M1, typename M2, typename M3, typename M4, typename M5,
             typename M6, typename M7, typename M8>
   typename EnableIfValidArity<
       8, VariadicOperatorMatcher<M1, M2, M3, M4, M5, M6, M7, M8> >::type
   operator()(const M1 &P1, const M2 &P2, const M3 &P3, const M4 &P4,
              const M5 &P5, const M6 &P6, const M7 &P7, const M8 &P8) const {
     return VariadicOperatorMatcher<M1, M2, M3, M4, M5, M6, M7, M8>(
-        Func, P1, P2, P3, P4, P5, P6, P7, P8);
+        Op, P1, P2, P3, P4, P5, P6, P7, P8);
   }
   template <typename M1, typename M2, typename M3, typename M4, typename M5,
             typename M6, typename M7, typename M8, typename M9>
   typename EnableIfValidArity<
       9, VariadicOperatorMatcher<M1, M2, M3, M4, M5, M6, M7, M8, M9> >::type
   operator()(const M1 &P1, const M2 &P2, const M3 &P3, const M4 &P4,
              const M5 &P5, const M6 &P6, const M7 &P7, const M8 &P8,
              const M9 &P9) const {
     return VariadicOperatorMatcher<M1, M2, M3, M4, M5, M6, M7, M8, M9>(
-        Func, P1, P2, P3, P4, P5, P6, P7, P8, P9);
+        Op, P1, P2, P3, P4, P5, P6, P7, P8, P9);
   }
 };
 
 /// @}
 
-/// \brief Matches nodes that do not match the provided matcher.
-///
-/// Uses the variadic matcher interface, but fails if InnerMatchers.size()!=1.
-bool NotUnaryOperator(const ast_type_traits::DynTypedNode DynNode,
-                      ASTMatchFinder *Finder, BoundNodesTreeBuilder *Builder,
-                      ArrayRef<DynTypedMatcher> InnerMatchers);
-
-/// \brief Matches nodes for which all provided matchers match.
-bool AllOfVariadicOperator(const ast_type_traits::DynTypedNode DynNode,
-                           ASTMatchFinder *Finder,
-                           BoundNodesTreeBuilder *Builder,
-                           ArrayRef<DynTypedMatcher> InnerMatchers);
-
-/// \brief Matches nodes for which at least one of the provided matchers
-/// matches, but doesn't stop at the first match.
-bool EachOfVariadicOperator(const ast_type_traits::DynTypedNode DynNode,
-                            ASTMatchFinder *Finder,
-                            BoundNodesTreeBuilder *Builder,
-                            ArrayRef<DynTypedMatcher> InnerMatchers);
-
-/// \brief Matches nodes for which at least one of the provided matchers
-/// matches.
-bool AnyOfVariadicOperator(const ast_type_traits::DynTypedNode DynNode,
-                           ASTMatchFinder *Finder,
-                           BoundNodesTreeBuilder *Builder,
-                           ArrayRef<DynTypedMatcher> InnerMatchers);
-
 template <typename T>
 inline Matcher<T> DynTypedMatcher::unconditionalConvertTo() const {
   return Matcher<T>(*this);
 }
 
 /// \brief Creates a Matcher<T> that matches if all inner matchers match.
 template<typename T>
 BindableMatcher<T> makeAllOfComposite(
     ArrayRef<const Matcher<T> *> InnerMatchers) {
   // For the size() == 0 case, we return a "true" matcher.
   if (InnerMatchers.size() == 0) {
     return BindableMatcher<T>(TrueMatcher());
   }
   // For the size() == 1 case, we simply return that one matcher.
   // No need to wrap it in a variadic operation.
   if (InnerMatchers.size() == 1) {
     return BindableMatcher<T>(*InnerMatchers[0]);
   }
 
   std::vector<DynTypedMatcher> DynMatchers;
   DynMatchers.reserve(InnerMatchers.size());
   for (const auto *InnerMatcher : InnerMatchers) {
     DynMatchers.push_back(*InnerMatcher);
   }
-  return BindableMatcher<T>(DynTypedMatcher::constructVariadic(
-                                AllOfVariadicOperator, std::move(DynMatchers))
-                                .template unconditionalConvertTo<T>());
+  return BindableMatcher<T>(
+      DynTypedMatcher::constructVariadic(DynTypedMatcher::VO_AllOf,
+                                         std::move(DynMatchers))
 }
 
 /// \brief Creates a Matcher<T> that matches if
 /// T is dyn_cast'able into InnerT and all inner matchers match.
 ///
 /// Returns BindableMatcher, as matchers that use dyn_cast have
 /// the same object both to match on and to run submatchers on,
 /// so there is no ambiguity with what gets bound.

include/clang/ASTMatchers/Dynamic/VariantValue.h

public:
     /// DynTypedMatcher.
     virtual DynTypedMatcher
     convertMatcher(const DynTypedMatcher &Matcher) const = 0;
 
     /// \brief Constructs a variadic typed matcher from \p InnerMatchers.
     /// Will try to convert each inner matcher to the destination type and
     /// return llvm::None if it fails to do so.
     llvm::Optional<DynTypedMatcher>
-    constructVariadicOperator(DynTypedMatcher::VariadicOperatorFunction Func,
+    constructVariadicOperator(DynTypedMatcher::VariadicOperator Op,
                               ArrayRef<VariantMatcher> InnerMatchers) const;
 
   protected:
     ~MatcherOps() {}
 
   private:
     ast_type_traits::ASTNodeKind NodeKind;
   };
public:
   /// They should be the result of a polymorphic matcher.
   static VariantMatcher
   PolymorphicMatcher(std::vector<DynTypedMatcher> Matchers);
 
   /// \brief Creates a 'variadic' operator matcher.
   ///
   /// It will bind to the appropriate type on getTypedMatcher<T>().
   static VariantMatcher
-  VariadicOperatorMatcher(DynTypedMatcher::VariadicOperatorFunction Func,
+  VariadicOperatorMatcher(DynTypedMatcher::VariadicOperator Op,
                           std::vector<VariantMatcher> Args);
 
   /// \brief Makes the matcher the "null" matcher.
   void reset();
 
   /// \brief Whether the matcher is null.
   bool isNull() const { return !Value; }
 

lib/ASTMatchers/ASTMatchersInternal.cpp

 #include "clang/ASTMatchers/ASTMatchersInternal.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/ManagedStatic.h"
 
 namespace clang {
 namespace ast_matchers {
 namespace internal {
 
+bool NotUnaryOperator(const ast_type_traits::DynTypedNode DynNode,
+                      ASTMatchFinder *Finder, BoundNodesTreeBuilder *Builder,
+                      ArrayRef<DynTypedMatcher> InnerMatchers);
+
+bool AllOfVariadicOperator(const ast_type_traits::DynTypedNode DynNode,
+                           ASTMatchFinder *Finder,
+                           BoundNodesTreeBuilder *Builder,
+                           ArrayRef<DynTypedMatcher> InnerMatchers);
+
+bool EachOfVariadicOperator(const ast_type_traits::DynTypedNode DynNode,
+                            ASTMatchFinder *Finder,
+                            BoundNodesTreeBuilder *Builder,
+                            ArrayRef<DynTypedMatcher> InnerMatchers);
+
+bool AnyOfVariadicOperator(const ast_type_traits::DynTypedNode DynNode,
+                           ASTMatchFinder *Finder,
+                           BoundNodesTreeBuilder *Builder,
+                           ArrayRef<DynTypedMatcher> InnerMatchers);
+
+
 void BoundNodesTreeBuilder::visitMatches(Visitor *ResultVisitor) {
   if (Bindings.empty())
     Bindings.push_back(BoundNodesMap());
   for (BoundNodesMap &Binding : Bindings) {
     ResultVisitor->visitMatch(BoundNodes(Binding));
   }
 }
 
 namespace {
 
 class VariadicMatcher : public DynMatcherInterface {
- public:
-  VariadicMatcher(DynTypedMatcher::VariadicOperatorFunction Func,
+  typedef bool (*VariadicOperatorFunction)(
+      const ast_type_traits::DynTypedNode DynNode, ASTMatchFinder *Finder,
+      BoundNodesTreeBuilder *Builder, ArrayRef<DynTypedMatcher> InnerMatchers);
+
+  VariadicMatcher(VariadicOperatorFunction Func,
                   std::vector<DynTypedMatcher> InnerMatchers)
       : Func(Func), InnerMatchers(std::move(InnerMatchers)) {}
 
   bool dynMatches(const ast_type_traits::DynTypedNode &DynNode,
                   ASTMatchFinder *Finder,
                   BoundNodesTreeBuilder *Builder) const override {
     return Func(DynNode, Finder, Builder, InnerMatchers);
   }
 
- private:
-  DynTypedMatcher::VariadicOperatorFunction Func;
+  VariadicOperatorFunction Func;
   std::vector<DynTypedMatcher> InnerMatchers;
 };
 
 class IdDynMatcher : public DynMatcherInterface {
  public:
   IdDynMatcher(StringRef ID,
                const IntrusiveRefCntPtr<DynMatcherInterface> &InnerMatcher)
       : ID(ID), InnerMatcher(InnerMatcher) {}
bool dynMatches(const ast_type_traits::DynTypedNode &, ASTMatchFinder *,
     return true;
   }
 };
 static llvm::ManagedStatic<TrueMatcherImpl> TrueMatcherInstance;
 
 }  // namespace
 
 DynTypedMatcher DynTypedMatcher::constructVariadic(
-    DynTypedMatcher::VariadicOperatorFunction Func,
+    DynTypedMatcher::VariadicOperator Op,
     std::vector<DynTypedMatcher> InnerMatchers) {
   assert(InnerMatchers.size() > 0 && "Array must not be empty.");
   assert(std::all_of(InnerMatchers.begin(), InnerMatchers.end(),
                      [&InnerMatchers](const DynTypedMatcher &M) {
            return InnerMatchers[0].SupportedKind.isSame(M.SupportedKind);
          }) &&
          "SupportedKind must match!");
 
   // We must relax the restrict kind here.
   // The different operators might deal differently with a mismatch.
   // Make it the same as SupportedKind, since that is the broadest type we are
   // allowed to accept.
   auto SupportedKind = InnerMatchers[0].SupportedKind;
+  VariadicMatcher::VariadicOperatorFunction Func;
+  switch (Op) {
+  case VO_AllOf:
+    Func = AllOfVariadicOperator;
+    break;
+  case VO_AnyOf:
+    Func = AnyOfVariadicOperator;
+    break;
+  case VO_EachOf:
+    Func = EachOfVariadicOperator;
+    break;
+  case VO_UnaryNot:
+    Func = NotUnaryOperator;
+    break;
+  }
+
   return DynTypedMatcher(SupportedKind, SupportedKind,
                          new VariadicMatcher(Func, std::move(InnerMatchers)));
 }
 
 DynTypedMatcher DynTypedMatcher::trueMatcher(
     ast_type_traits::ASTNodeKind NodeKind) {
   return DynTypedMatcher(NodeKind, NodeKind, &*TrueMatcherInstance);
 }

lib/ASTMatchers/Dynamic/Marshallers.h

 
 private:
   std::vector<std::unique_ptr<MatcherDescriptor>> Overloads;
 };
 
 /// \brief Variadic operator marshaller function.
 class VariadicOperatorMatcherDescriptor : public MatcherDescriptor {
 public:
-  typedef DynTypedMatcher::VariadicOperatorFunction VarFunc;
+  typedef DynTypedMatcher::VariadicOperator VarOp;
   VariadicOperatorMatcherDescriptor(unsigned MinCount, unsigned MaxCount,
-                                    VarFunc Func, StringRef MatcherName)
-      : MinCount(MinCount), MaxCount(MaxCount), Func(Func),
+                                    VarOp Op, StringRef MatcherName)
+      : MinCount(MinCount), MaxCount(MaxCount), Op(Op),
         MatcherName(MatcherName) {}
 
   virtual VariantMatcher create(const SourceRange &NameRange,
                                 ArrayRef<ParserValue> Args,
                                 Diagnostics *Error) const override {
     if (Args.size() < MinCount || MaxCount < Args.size()) {
       const std::string MaxStr =
           (MaxCount == UINT_MAX ? "" : Twine(MaxCount)).str();
       Error->addError(NameRange, Error->ET_RegistryWrongArgCount)
           << ("(" + Twine(MinCount) + ", " + MaxStr + ")") << Args.size();
       return VariantMatcher();
     }
 
     std::vector<VariantMatcher> InnerArgs;
     for (size_t i = 0, e = Args.size(); i != e; ++i) {
       const ParserValue &Arg = Args[i];
       const VariantValue &Value = Arg.Value;
       if (!Value.isMatcher()) {
         Error->addError(Arg.Range, Error->ET_RegistryWrongArgType)
             << (i + 1) << "Matcher<>" << Value.getTypeAsString();
         return VariantMatcher();
       }
       InnerArgs.push_back(Value.getMatcher());
     }
-    return VariantMatcher::VariadicOperatorMatcher(Func, std::move(InnerArgs));
+    return VariantMatcher::VariadicOperatorMatcher(Op, std::move(InnerArgs));
   }
 
   bool isVariadic() const override { return true; }
   unsigned getNumArgs() const override { return 0; }
   void getArgKinds(ast_type_traits::ASTNodeKind ThisKind, unsigned ArgNo,
                    std::vector<ArgKind> &Kinds) const override {
     Kinds.push_back(ThisKind);
   }
   bool isConvertibleTo(ast_type_traits::ASTNodeKind Kind, unsigned *Specificity,
                        ast_type_traits::ASTNodeKind *LeastDerivedKind) const override {
     if (Specificity)
       *Specificity = 1;
     if (LeastDerivedKind)
       *LeastDerivedKind = Kind;
     return true;
   }
   bool isPolymorphic() const override { return true; }
 
 private:
   const unsigned MinCount;
   const unsigned MaxCount;
-  const VarFunc Func;
+  const VarOp Op;
   const StringRef MatcherName;
 };
 
 /// Helper functions to select the appropriate marshaller functions.
 /// They detect the number of arguments, arguments types and return type.
 
 /// \brief 0-arg overload
 template <typename ReturnType>

 }
 
 /// \brief Variadic operator overload.
 template <unsigned MinCount, unsigned MaxCount>
 MatcherDescriptor *
 makeMatcherAutoMarshall(ast_matchers::internal::VariadicOperatorMatcherFunc<
                             MinCount, MaxCount> Func,
                         StringRef MatcherName) {
-  return new VariadicOperatorMatcherDescriptor(MinCount, MaxCount, Func.Func,
+  return new VariadicOperatorMatcherDescriptor(MinCount, MaxCount, Func.Op,
                                                MatcherName);
 }
 
 }  // namespace internal
 }  // namespace dynamic
 }  // namespace ast_matchers
 }  // namespace clang
 
 #endif  // LLVM_CLANG_AST_MATCHERS_DYNAMIC_MARSHALLERS_H

lib/ASTMatchers/Dynamic/VariantValue.cpp

 VariantMatcher::MatcherOps::canConstructFrom(const DynTypedMatcher &Matcher,
                                              bool &IsExactMatch) const {
   IsExactMatch = Matcher.getSupportedKind().isSame(NodeKind);
   return Matcher.canConvertTo(NodeKind);
 }
 
 llvm::Optional<DynTypedMatcher>
 VariantMatcher::MatcherOps::constructVariadicOperator(
-    DynTypedMatcher::VariadicOperatorFunction Func,
+    DynTypedMatcher::VariadicOperator Op,
     ArrayRef<VariantMatcher> InnerMatchers) const {
   std::vector<DynTypedMatcher> DynMatchers;
   for (const auto &InnerMatcher : InnerMatchers) {
     // Abort if any of the inner matchers can't be converted to
     // Matcher<T>.
     if (!InnerMatcher.Value)
       return llvm::None;
     llvm::Optional<DynTypedMatcher> Inner =
         InnerMatcher.Value->getTypedMatcher(*this);
     if (!Inner)
       return llvm::None;
     DynMatchers.push_back(*Inner);
   }
-  return DynTypedMatcher::constructVariadic(Func, DynMatchers);
+  return DynTypedMatcher::constructVariadic(Op, DynMatchers);
 }
 
 VariantMatcher::Payload::~Payload() {}
 
 class VariantMatcher::SinglePayload : public VariantMatcher::Payload {
 public:
   SinglePayload(const DynTypedMatcher &Matcher) : Matcher(Matcher) {}
 
bool isConvertibleTo(ast_type_traits::ASTNodeKind Kind,
     return MaxSpecificity > 0;
   }
 
   const std::vector<DynTypedMatcher> Matchers;
 };
 
 class VariantMatcher::VariadicOpPayload : public VariantMatcher::Payload {
 public:
-  VariadicOpPayload(DynTypedMatcher::VariadicOperatorFunction Func,
+  VariadicOpPayload(DynTypedMatcher::VariadicOperator Op,
                     std::vector<VariantMatcher> Args)
-      : Func(Func), Args(std::move(Args)) {}
+      : Op(Op), Args(std::move(Args)) {}
 
   llvm::Optional<DynTypedMatcher> getSingleMatcher() const override {
     return llvm::Optional<DynTypedMatcher>();
   }
 
   std::string getTypeAsString() const override {
     std::string Inner;
     for (size_t i = 0, e = Args.size(); i != e; ++i) {
       if (i != 0)
         Inner += "&";
       Inner += Args[i].getTypeAsString();
     }
     return Inner;
   }
 
   llvm::Optional<DynTypedMatcher>
   getTypedMatcher(const MatcherOps &Ops) const override {
-    return Ops.constructVariadicOperator(Func, Args);
+    return Ops.constructVariadicOperator(Op, Args);
   }
 
   bool isConvertibleTo(ast_type_traits::ASTNodeKind Kind,
                        unsigned *Specificity) const override {
     for (const VariantMatcher &Matcher : Args) {
       if (!Matcher.isConvertibleTo(Kind, Specificity))
         return false;
     }
     return true;
   }
 
 private:
-  const DynTypedMatcher::VariadicOperatorFunction Func;
+  const DynTypedMatcher::VariadicOperator Op;
   const std::vector<VariantMatcher> Args;
 };
 
 VariantMatcher::VariantMatcher() {}
 
 VariantMatcher VariantMatcher::SingleMatcher(const DynTypedMatcher &Matcher) {
   return VariantMatcher(new SinglePayload(Matcher));
 }
 
 VariantMatcher
 VariantMatcher::PolymorphicMatcher(std::vector<DynTypedMatcher> Matchers) {
   return VariantMatcher(new PolymorphicPayload(std::move(Matchers)));
 }
 
 VariantMatcher VariantMatcher::VariadicOperatorMatcher(
-    DynTypedMatcher::VariadicOperatorFunction Func,
+    DynTypedMatcher::VariadicOperator Op,
     std::vector<VariantMatcher> Args) {
-  return VariantMatcher(new VariadicOpPayload(Func, std::move(Args)));
+  return VariantMatcher(new VariadicOpPayload(Op, std::move(Args)));
 }
 
 llvm::Optional<DynTypedMatcher> VariantMatcher::getSingleMatcher() const {
   return Value ? Value->getSingleMatcher() : llvm::Optional<DynTypedMatcher>();
 }
 
 void VariantMatcher::reset() { Value.reset(); }