Swift AST/SIL: add Type APIs for Builtin.FixedArray

* `Type.isBuiltinFixedArray`
* `Type.builtinFixedArrayElementType`

Author: eeckstein

SwiftCompilerSources/Sources/AST/Type.swift

@@ -61,6 +61,8 @@ public struct Type: TypeProperties, CustomStringConvertible, NoReflectionChildre
 
   public var builtinVectorElementType: Type { Type(bridged: bridged.getBuiltinVectorElementType()) }
 
+  public var builtinFixedArrayElementType: Type { Type(bridged: bridged.getBuiltinFixedArrayElementType()) }
+
   public func subst(with substitutionMap: SubstitutionMap) -> Type {
     return Type(bridged: bridged.subst(substitutionMap.bridged))
   }
@@ -81,6 +83,8 @@ public struct CanonicalType: TypeProperties, CustomStringConvertible, NoReflecti
 
   public var builtinVectorElementType: CanonicalType { rawType.builtinVectorElementType.canonical }
 
+  public var builtinFixedArrayElementType: CanonicalType { rawType.builtinFixedArrayElementType.canonical }
+
   public func subst(with substitutionMap: SubstitutionMap) -> CanonicalType {
     return rawType.subst(with: substitutionMap).canonical
   }
@@ -106,6 +110,7 @@ extension TypeProperties {
 
   public var isBuiltinFloat: Bool { rawType.bridged.isBuiltinFloat() }
   public var isBuiltinVector: Bool { rawType.bridged.isBuiltinVector() }
+  public var isBuiltinFixedArray: Bool { rawType.bridged.isBuiltinFixedArray() }
 
   public var isClass: Bool {
     if let nominal = nominal, nominal is ClassDecl {

SwiftCompilerSources/Sources/SIL/Type.swift

@@ -82,6 +82,10 @@ public struct Type : TypeProperties, CustomStringConvertible, NoReflectionChildr
 
   public var builtinVectorElementType: Type { canonicalType.builtinVectorElementType.silType! }
 
+  public func builtinFixedArrayElementType(in function: Function, maximallyAbstracted: Bool = false) -> Type {
+    canonicalType.builtinFixedArrayElementType.loweredType(in: function, maximallyAbstracted: maximallyAbstracted)
+  }
+
   public var superClassType: Type? { canonicalType.superClassType?.silType }
 
   public func isExactSuperclass(of type: Type) -> Bool {

include/swift/AST/ASTBridging.h

@@ -3102,7 +3102,9 @@ struct BridgedASTType {
   BRIDGED_INLINE bool isBuiltinInteger() const;
   BRIDGED_INLINE bool isBuiltinFloat() const;
   BRIDGED_INLINE bool isBuiltinVector() const;
+  BRIDGED_INLINE bool isBuiltinFixedArray() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedASTType getBuiltinVectorElementType() const;
+  SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedASTType getBuiltinFixedArrayElementType() const;
   BRIDGED_INLINE bool isBuiltinFixedWidthInteger(SwiftInt width) const;
   BRIDGED_INLINE bool isOptional() const;
   BRIDGED_INLINE bool isBuiltinType() const;

include/swift/AST/ASTBridgingImpl.h

@@ -542,10 +542,18 @@ bool BridgedASTType::isBuiltinVector() const {
   return unbridged()->is<swift::BuiltinVectorType>();
 }
 
+bool BridgedASTType::isBuiltinFixedArray() const {
+  return unbridged()->is<swift::BuiltinFixedArrayType>();
+}
+
 BridgedASTType BridgedASTType::getBuiltinVectorElementType() const {
   return {unbridged()->castTo<swift::BuiltinVectorType>()->getElementType().getPointer()};
 }
 
+BridgedASTType BridgedASTType::getBuiltinFixedArrayElementType() const {
+  return {unbridged()->castTo<swift::BuiltinFixedArrayType>()->getElementType().getPointer()};
+}
+
 bool BridgedASTType::isBuiltinFixedWidthInteger(SwiftInt width) const {
   if (auto *intTy = unbridged()->getAs<swift::BuiltinIntegerType>())
     return intTy->isFixedWidth((unsigned)width);