AST: add some Declaration APIs

* `var Declaration.parentModule`
* `var AbstractFunctionDecl.isOverridden`

Author: eeckstein

SwiftCompilerSources/Sources/AST/Declarations.swift

@@ -20,6 +20,9 @@ public class Decl: CustomStringConvertible, Hashable {
 
   public var description: String { String(taking: bridged.getDebugDescription()) }
 
+  /// The module in which this declaration resides.
+  public var parentModule: ModuleDecl { bridged.getModuleContext().getAs(ModuleDecl.self) }
+
   // True if this declaration is imported from C/C++/ObjC.
   public var hasClangNode: Bool { bridged.hasClangNode() }
 
@@ -88,7 +91,9 @@ final public class ParamDecl: VarDecl {}
 
 final public class SubscriptDecl: AbstractStorageDecl {}
 
-public class AbstractFunctionDecl: ValueDecl {}
+public class AbstractFunctionDecl: ValueDecl {
+  public var isOverridden: Bool { bridged.AbstractFunction_isOverridden() }
+}
 
 final public class ConstructorDecl: AbstractFunctionDecl {}
 

include/swift/AST/ASTBridging.h

@@ -378,6 +378,7 @@ struct BridgedDeclObj {
   BridgedDeclObj(SwiftObject obj) : obj(obj) {}
   BridgedOwnedString getDebugDescription() const;
   BRIDGED_INLINE BridgedSourceLoc getLoc() const;
+  SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedDeclObj getModuleContext() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedStringRef Type_getName() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedStringRef Value_getUserFacingName() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedSourceLoc Value_getNameLoc() const;
@@ -389,6 +390,7 @@ struct BridgedDeclObj {
   BRIDGED_INLINE bool Struct_hasUnreferenceableStorage() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedASTType Class_getSuperclass() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedDeclObj Class_getDestructor() const;
+  BRIDGED_INLINE bool AbstractFunction_isOverridden() const;
   BRIDGED_INLINE bool Destructor_isIsolated() const;
 };
 

include/swift/AST/ASTBridgingImpl.h

@@ -176,6 +176,10 @@ BridgedSourceLoc BridgedDeclObj::getLoc() const {
   return BridgedSourceLoc(sourceLoc.getOpaquePointerValue());
 }
 
+BridgedDeclObj BridgedDeclObj::getModuleContext() const {
+  return {unbridged()->getModuleContext()};
+}
+
 BridgedStringRef BridgedDeclObj::Type_getName() const {
   return getAs<swift::TypeDecl>()->getName().str();
 }
@@ -220,6 +224,10 @@ BridgedDeclObj BridgedDeclObj::Class_getDestructor() const {
   return {getAs<swift::ClassDecl>()->getDestructor()};
 }
 
+bool BridgedDeclObj::AbstractFunction_isOverridden() const {
+  return getAs<swift::AbstractFunctionDecl>()->isOverridden();
+}
+
 bool BridgedDeclObj::Destructor_isIsolated() const {
   auto dd = getAs<swift::DestructorDecl>();
   auto ai = swift::getActorIsolation(dd);