[CS] Move getUnopenedTypeOfReference out of TypeChecker

lib/Sema/ConstraintSystem.cpp

@@ -925,7 +925,7 @@ Type ConstraintSystem::getUnopenedTypeOfReference(VarDecl *value, Type baseType,
                                                   DeclContext *UseDC,
                                                   const DeclRefExpr *base,
                                                   bool wantInterfaceType) {
-  return TypeChecker::getUnopenedTypeOfReference(
+  return ConstraintSystem::getUnopenedTypeOfReference(
       value, baseType, UseDC,
       [&](VarDecl *var) -> Type {
         if (Type type = getTypeIfAvailable(var))
@@ -940,7 +940,7 @@ Type ConstraintSystem::getUnopenedTypeOfReference(VarDecl *value, Type baseType,
       base, wantInterfaceType);
 }
 
-Type TypeChecker::getUnopenedTypeOfReference(
+Type ConstraintSystem::getUnopenedTypeOfReference(
     VarDecl *value, Type baseType, DeclContext *UseDC,
     llvm::function_ref<Type(VarDecl *)> getType, const DeclRefExpr *base,
     bool wantInterfaceType) {
@@ -1405,9 +1405,9 @@ ConstraintSystem::getTypeOfMemberReference(
                               ->castTo<AnyFunctionType>()->getParams();
       refType = FunctionType::get(indices, elementTy);
     } else {
-      refType = TypeChecker::getUnopenedTypeOfReference(
-          cast<VarDecl>(value), baseTy, useDC, base,
-          /*wantInterfaceType=*/true);
+      refType =
+          getUnopenedTypeOfReference(cast<VarDecl>(value), baseTy, useDC, base,
+                                     /*wantInterfaceType=*/true);
     }
 
     auto selfTy = outerDC->getSelfInterfaceType();

lib/Sema/ConstraintSystem.h

@@ -3260,6 +3260,25 @@ class ConstraintSystem {
                                   const DeclRefExpr *base = nullptr,
                                   bool wantInterfaceType = false);
 
+  /// Return the type-of-reference of the given value.
+  ///
+  /// \param baseType if non-null, return the type of a member reference to
+  ///   this value when the base has the given type
+  ///
+  /// \param UseDC The context of the access.  Some variables have different
+  ///   types depending on where they are used.
+  ///
+  /// \param base The optional base expression of this value reference
+  ///
+  /// \param wantInterfaceType Whether we want the interface type, if available.
+  ///
+  /// \param getType Optional callback to extract a type for given declaration.
+  static Type
+  getUnopenedTypeOfReference(VarDecl *value, Type baseType, DeclContext *UseDC,
+                             llvm::function_ref<Type(VarDecl *)> getType,
+                             const DeclRefExpr *base = nullptr,
+                             bool wantInterfaceType = false);
+
   /// Retrieve the type of a reference to the given value declaration,
   /// as a member with a base of the given type.
   ///

lib/Sema/TypeCheckExpr.cpp

@@ -23,6 +23,8 @@
 #include "swift/AST/SourceFile.h"
 #include "swift/AST/TypeCheckRequests.h"
 #include "swift/Parse/Lexer.h"
+#include "ConstraintSystem.h"
+
 using namespace swift;
 
 //===----------------------------------------------------------------------===//
@@ -591,7 +593,9 @@ bool TypeChecker::requireArrayLiteralIntrinsics(ASTContext &ctx,
 
 Expr *TypeChecker::buildCheckedRefExpr(VarDecl *value, DeclContext *UseDC,
                                        DeclNameLoc loc, bool Implicit) {
-  auto type = TypeChecker::getUnopenedTypeOfReference(value, Type(), UseDC);
+  auto type = constraints::ConstraintSystem::getUnopenedTypeOfReference(
+      value, Type(), UseDC,
+      [&](VarDecl *var) -> Type { return value->getType(); });
   auto semantics = value->getAccessSemanticsFromContext(UseDC,
                                                        /*isAccessOnSelf*/false);
   return new (value->getASTContext())

lib/Sema/TypeChecker.h

@@ -989,49 +989,6 @@ class TypeChecker final {
   static bool contextualizeInitializer(Initializer *DC, Expr *init);
   static void contextualizeTopLevelCode(TopLevelCodeDecl *TLCD);
 
-  /// Return the type-of-reference of the given value.
-  ///
-  /// \param baseType if non-null, return the type of a member reference to
-  ///   this value when the base has the given type
-  ///
-  /// \param UseDC The context of the access.  Some variables have different
-  ///   types depending on where they are used.
-  ///
-  /// \param base The optional base expression of this value reference
-  ///
-  /// \param wantInterfaceType Whether we want the interface type, if available.
-  ///
-  /// \param getType Optional callback to extract a type for given declaration.
-  static Type
-  getUnopenedTypeOfReference(VarDecl *value, Type baseType, DeclContext *UseDC,
-                             llvm::function_ref<Type(VarDecl *)> getType,
-                             const DeclRefExpr *base = nullptr,
-                             bool wantInterfaceType = false);
-
-  /// Return the type-of-reference of the given value.
-  ///
-  /// \param baseType if non-null, return the type of a member reference to
-  ///   this value when the base has the given type
-  ///
-  /// \param UseDC The context of the access.  Some variables have different
-  ///   types depending on where they are used.
-  ///
-  /// \param base The optional base expression of this value reference
-  ///
-  /// \param wantInterfaceType Whether we want the interface type, if available.
-  static Type getUnopenedTypeOfReference(VarDecl *value, Type baseType,
-                                         DeclContext *UseDC,
-                                         const DeclRefExpr *base = nullptr,
-                                         bool wantInterfaceType = false) {
-    return getUnopenedTypeOfReference(
-        value, baseType, UseDC,
-        [&](VarDecl *var) -> Type {
-          return wantInterfaceType ? value->getInterfaceType()
-                                   : value->getType();
-        },
-        base, wantInterfaceType);
-  }
-
   /// Retrieve the default type for the given protocol.
   ///
   /// Some protocols, particularly those that correspond to literals, have