AST: add Type.interfaceTypeOfArchetype and some related APIs

Author: eeckstein

SwiftCompilerSources/Sources/AST/Type.swift

@@ -50,6 +50,8 @@ public struct Type: TypeProperties, CustomStringConvertible, NoReflectionChildre
 
   public var staticTypeOfDynamicSelf: Type { Type(bridged: bridged.getStaticTypeOfDynamicSelf()) }
 
+  public var interfaceTypeOfArchetype: Type { Type(bridged: bridged.getInterfaceTypeOfArchetype()) }
+
   public var superClassType: Type? {
     precondition(isClass)
     let bridgedSuperClassTy = bridged.getSuperClassType()
@@ -141,6 +143,8 @@ extension TypeProperties {
   public var isArchetype: Bool { rawType.bridged.isArchetype() }
   public var isExistentialArchetype: Bool { rawType.bridged.isExistentialArchetype() }
   public var isExistentialArchetypeWithError: Bool { rawType.bridged.isExistentialArchetypeWithError() }
+  public var isRootArchetype: Bool { rawType.interfaceTypeOfArchetype.isGenericTypeParameter }
+  public var isRootExistentialArchetype: Bool { isExistentialArchetype && isRootArchetype }
   public var isExistential: Bool { rawType.bridged.isExistential() }
   public var isClassExistential: Bool { rawType.bridged.isClassExistential() }
   public var isGenericTypeParameter: Bool { rawType.bridged.isGenericTypeParam() }

include/swift/AST/ASTBridging.h

@@ -3133,6 +3133,7 @@ struct BridgedASTType {
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE OptionalBridgedDeclObj getAnyNominal() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedASTType getInstanceTypeOfMetatype() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedASTType getStaticTypeOfDynamicSelf() const;
+  SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedASTType getInterfaceTypeOfArchetype() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedASTType getSuperClassType() const;
   BRIDGED_INLINE MetatypeRepresentation getRepresentationOfMetatype() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedSubstitutionMap getContextSubstitutionMap() const;

include/swift/AST/ASTBridgingImpl.h

@@ -567,6 +567,10 @@ BridgedASTType BridgedASTType::getStaticTypeOfDynamicSelf() const {
   return {unbridged()->getAs<swift::DynamicSelfType>()->getSelfType().getPointer()};
 }
 
+BridgedASTType BridgedASTType::getInterfaceTypeOfArchetype() const {
+  return {unbridged()->getAs<swift::ArchetypeType>()->getInterfaceType().getPointer()};
+}
+
 BridgedASTType BridgedASTType::getSuperClassType() const {
   return {unbridged()->getSuperclass().getPointer()};
 }