WIP [swiftgen] Trying to repro #2871

pkgs/swiftgen/test/integration/regress_2871.swift

@@ -0,0 +1,9 @@
+import Foundation
+
+@objc public class TestEmptyClass: NSObject {}
+
+@objc public class TestFuncs: NSObject {
+  @objc public static func echoObject() -> NSObject? {
+    return TestEmptyClass()
+  }
+}

pkgs/swiftgen/test/integration/regress_2871_bindings.dart

@@ -0,0 +1,373 @@
+// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// coverage:ignore-file
+
+// AUTO GENERATED FILE, DO NOT EDIT.
+//
+// Generated by `package:ffigen`.
+// ignore_for_file: type=lint, unused_import
+import 'dart:ffi' as ffi;
+import 'package:objective_c/objective_c.dart' as objc;
+import 'package:ffi/ffi.dart' as pkg_ffi;
+
+late final _class_TestEmptyClass = objc.getClass("regress_2871.TestEmptyClass");
+late final _sel_isKindOfClass_ = objc.registerName("isKindOfClass:");
+final _objc_msgSend_19nvye5 = objc.msgSendPointer
+    .cast<
+      ffi.NativeFunction<
+        ffi.Bool Function(
+          ffi.Pointer<objc.ObjCObjectImpl>,
+          ffi.Pointer<objc.ObjCSelector>,
+          ffi.Pointer<objc.ObjCObjectImpl>,
+        )
+      >
+    >()
+    .asFunction<
+      bool Function(
+        ffi.Pointer<objc.ObjCObjectImpl>,
+        ffi.Pointer<objc.ObjCSelector>,
+        ffi.Pointer<objc.ObjCObjectImpl>,
+      )
+    >();
+typedef instancetype = ffi.Pointer<objc.ObjCObjectImpl>;
+typedef Dartinstancetype = objc.ObjCObject;
+late final _sel_init = objc.registerName("init");
+final _objc_msgSend_151sglz = objc.msgSendPointer
+    .cast<
+      ffi.NativeFunction<
+        ffi.Pointer<objc.ObjCObjectImpl> Function(
+          ffi.Pointer<objc.ObjCObjectImpl>,
+          ffi.Pointer<objc.ObjCSelector>,
+        )
+      >
+    >()
+    .asFunction<
+      ffi.Pointer<objc.ObjCObjectImpl> Function(
+        ffi.Pointer<objc.ObjCObjectImpl>,
+        ffi.Pointer<objc.ObjCSelector>,
+      )
+    >();
+late final _sel_new = objc.registerName("new");
+late final _sel_allocWithZone_ = objc.registerName("allocWithZone:");
+final _objc_msgSend_1cwp428 = objc.msgSendPointer
+    .cast<
+      ffi.NativeFunction<
+        ffi.Pointer<objc.ObjCObjectImpl> Function(
+          ffi.Pointer<objc.ObjCObjectImpl>,
+          ffi.Pointer<objc.ObjCSelector>,
+          ffi.Pointer<objc.NSZone>,
+        )
+      >
+    >()
+    .asFunction<
+      ffi.Pointer<objc.ObjCObjectImpl> Function(
+        ffi.Pointer<objc.ObjCObjectImpl>,
+        ffi.Pointer<objc.ObjCSelector>,
+        ffi.Pointer<objc.NSZone>,
+      )
+    >();
+late final _sel_alloc = objc.registerName("alloc");
+
+/// TestEmptyClass
+extension type TestEmptyClass._(objc.ObjCObject object$)
+    implements objc.ObjCObject, objc.NSObject {
+  /// Constructs a [TestEmptyClass] that points to the same underlying object as [other].
+  TestEmptyClass.as(objc.ObjCObject other) : object$ = other {
+    assert(isA(object$));
+  }
+
+  /// Constructs a [TestEmptyClass] that wraps the given raw object pointer.
+  TestEmptyClass.fromPointer(
+    ffi.Pointer<objc.ObjCObjectImpl> other, {
+    bool retain = false,
+    bool release = false,
+  }) : object$ = objc.ObjCObject(other, retain: retain, release: release) {
+    assert(isA(object$));
+  }
+
+  /// Returns whether [obj] is an instance of [TestEmptyClass].
+  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
+    obj.ref.pointer,
+    _sel_isKindOfClass_,
+    _class_TestEmptyClass,
+  );
+
+  /// alloc
+  static TestEmptyClass alloc() {
+    final $ret = _objc_msgSend_151sglz(_class_TestEmptyClass, _sel_alloc);
+    return TestEmptyClass.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// allocWithZone:
+  static TestEmptyClass allocWithZone(ffi.Pointer<objc.NSZone> zone) {
+    final $ret = _objc_msgSend_1cwp428(
+      _class_TestEmptyClass,
+      _sel_allocWithZone_,
+      zone,
+    );
+    return TestEmptyClass.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// new
+  static TestEmptyClass new$() {
+    final $ret = _objc_msgSend_151sglz(_class_TestEmptyClass, _sel_new);
+    return TestEmptyClass.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// Returns a new instance of TestEmptyClass constructed with the default `new` method.
+  TestEmptyClass() : this.as(new$().object$);
+}
+
+extension TestEmptyClass$Methods on TestEmptyClass {
+  /// init
+  TestEmptyClass init() {
+    objc.checkOsVersionInternal(
+      'TestEmptyClass.init',
+      iOS: (false, (2, 0, 0)),
+      macOS: (false, (10, 0, 0)),
+    );
+    final $ret = _objc_msgSend_151sglz(
+      object$.ref.retainAndReturnPointer(),
+      _sel_init,
+    );
+    return TestEmptyClass.fromPointer($ret, retain: false, release: true);
+  }
+}
+
+late final _class_TestEmptyClassWrapper = objc.getClass(
+  "regress_2871.TestEmptyClassWrapper",
+);
+
+/// TestEmptyClassWrapper
+extension type TestEmptyClassWrapper._(objc.ObjCObject object$)
+    implements objc.ObjCObject, objc.NSObject {
+  /// Constructs a [TestEmptyClassWrapper] that points to the same underlying object as [other].
+  TestEmptyClassWrapper.as(objc.ObjCObject other) : object$ = other {
+    assert(isA(object$));
+  }
+
+  /// Constructs a [TestEmptyClassWrapper] that wraps the given raw object pointer.
+  TestEmptyClassWrapper.fromPointer(
+    ffi.Pointer<objc.ObjCObjectImpl> other, {
+    bool retain = false,
+    bool release = false,
+  }) : object$ = objc.ObjCObject(other, retain: retain, release: release) {
+    assert(isA(object$));
+  }
+
+  /// Returns whether [obj] is an instance of [TestEmptyClassWrapper].
+  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
+    obj.ref.pointer,
+    _sel_isKindOfClass_,
+    _class_TestEmptyClassWrapper,
+  );
+
+  /// alloc
+  static TestEmptyClassWrapper alloc() {
+    final $ret = _objc_msgSend_151sglz(
+      _class_TestEmptyClassWrapper,
+      _sel_alloc,
+    );
+    return TestEmptyClassWrapper.fromPointer(
+      $ret,
+      retain: false,
+      release: true,
+    );
+  }
+
+  /// allocWithZone:
+  static TestEmptyClassWrapper allocWithZone(ffi.Pointer<objc.NSZone> zone) {
+    final $ret = _objc_msgSend_1cwp428(
+      _class_TestEmptyClassWrapper,
+      _sel_allocWithZone_,
+      zone,
+    );
+    return TestEmptyClassWrapper.fromPointer(
+      $ret,
+      retain: false,
+      release: true,
+    );
+  }
+
+  /// new
+  static TestEmptyClassWrapper new$() {
+    final $ret = _objc_msgSend_151sglz(_class_TestEmptyClassWrapper, _sel_new);
+    return TestEmptyClassWrapper.fromPointer(
+      $ret,
+      retain: false,
+      release: true,
+    );
+  }
+
+  /// Returns a new instance of TestEmptyClassWrapper constructed with the default `new` method.
+  TestEmptyClassWrapper() : this.as(new$().object$);
+}
+
+extension TestEmptyClassWrapper$Methods on TestEmptyClassWrapper {
+  /// init
+  TestEmptyClassWrapper init() {
+    objc.checkOsVersionInternal(
+      'TestEmptyClassWrapper.init',
+      iOS: (false, (2, 0, 0)),
+      macOS: (false, (10, 0, 0)),
+    );
+    final $ret = _objc_msgSend_151sglz(
+      object$.ref.retainAndReturnPointer(),
+      _sel_init,
+    );
+    return TestEmptyClassWrapper.fromPointer(
+      $ret,
+      retain: false,
+      release: true,
+    );
+  }
+}
+
+late final _class_TestFuncs = objc.getClass("regress_2871.TestFuncs");
+late final _sel_echoObject = objc.registerName("echoObject");
+
+/// TestFuncs
+extension type TestFuncs._(objc.ObjCObject object$)
+    implements objc.ObjCObject, objc.NSObject {
+  /// Constructs a [TestFuncs] that points to the same underlying object as [other].
+  TestFuncs.as(objc.ObjCObject other) : object$ = other {
+    assert(isA(object$));
+  }
+
+  /// Constructs a [TestFuncs] that wraps the given raw object pointer.
+  TestFuncs.fromPointer(
+    ffi.Pointer<objc.ObjCObjectImpl> other, {
+    bool retain = false,
+    bool release = false,
+  }) : object$ = objc.ObjCObject(other, retain: retain, release: release) {
+    assert(isA(object$));
+  }
+
+  /// Returns whether [obj] is an instance of [TestFuncs].
+  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
+    obj.ref.pointer,
+    _sel_isKindOfClass_,
+    _class_TestFuncs,
+  );
+
+  /// alloc
+  static TestFuncs alloc() {
+    final $ret = _objc_msgSend_151sglz(_class_TestFuncs, _sel_alloc);
+    return TestFuncs.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// allocWithZone:
+  static TestFuncs allocWithZone(ffi.Pointer<objc.NSZone> zone) {
+    final $ret = _objc_msgSend_1cwp428(
+      _class_TestFuncs,
+      _sel_allocWithZone_,
+      zone,
+    );
+    return TestFuncs.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// echoObject
+  static objc.NSObject? echoObject() {
+    final $ret = _objc_msgSend_151sglz(_class_TestFuncs, _sel_echoObject);
+    return $ret.address == 0
+        ? null
+        : objc.NSObject.fromPointer($ret, retain: true, release: true);
+  }
+
+  /// new
+  static TestFuncs new$() {
+    final $ret = _objc_msgSend_151sglz(_class_TestFuncs, _sel_new);
+    return TestFuncs.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// Returns a new instance of TestFuncs constructed with the default `new` method.
+  TestFuncs() : this.as(new$().object$);
+}
+
+extension TestFuncs$Methods on TestFuncs {
+  /// init
+  TestFuncs init() {
+    objc.checkOsVersionInternal(
+      'TestFuncs.init',
+      iOS: (false, (2, 0, 0)),
+      macOS: (false, (10, 0, 0)),
+    );
+    final $ret = _objc_msgSend_151sglz(
+      object$.ref.retainAndReturnPointer(),
+      _sel_init,
+    );
+    return TestFuncs.fromPointer($ret, retain: false, release: true);
+  }
+}
+
+late final _class_TestFuncsWrapper = objc.getClass(
+  "regress_2871.TestFuncsWrapper",
+);
+
+/// TestFuncsWrapper
+extension type TestFuncsWrapper._(objc.ObjCObject object$)
+    implements objc.ObjCObject, objc.NSObject {
+  /// Constructs a [TestFuncsWrapper] that points to the same underlying object as [other].
+  TestFuncsWrapper.as(objc.ObjCObject other) : object$ = other {
+    assert(isA(object$));
+  }
+
+  /// Constructs a [TestFuncsWrapper] that wraps the given raw object pointer.
+  TestFuncsWrapper.fromPointer(
+    ffi.Pointer<objc.ObjCObjectImpl> other, {
+    bool retain = false,
+    bool release = false,
+  }) : object$ = objc.ObjCObject(other, retain: retain, release: release) {
+    assert(isA(object$));
+  }
+
+  /// Returns whether [obj] is an instance of [TestFuncsWrapper].
+  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
+    obj.ref.pointer,
+    _sel_isKindOfClass_,
+    _class_TestFuncsWrapper,
+  );
+
+  /// alloc
+  static TestFuncsWrapper alloc() {
+    final $ret = _objc_msgSend_151sglz(_class_TestFuncsWrapper, _sel_alloc);
+    return TestFuncsWrapper.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// allocWithZone:
+  static TestFuncsWrapper allocWithZone(ffi.Pointer<objc.NSZone> zone) {
+    final $ret = _objc_msgSend_1cwp428(
+      _class_TestFuncsWrapper,
+      _sel_allocWithZone_,
+      zone,
+    );
+    return TestFuncsWrapper.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// new
+  static TestFuncsWrapper new$() {
+    final $ret = _objc_msgSend_151sglz(_class_TestFuncsWrapper, _sel_new);
+    return TestFuncsWrapper.fromPointer($ret, retain: false, release: true);
+  }
+
+  /// Returns a new instance of TestFuncsWrapper constructed with the default `new` method.
+  TestFuncsWrapper() : this.as(new$().object$);
+}
+
+extension TestFuncsWrapper$Methods on TestFuncsWrapper {
+  /// init
+  TestFuncsWrapper init() {
+    objc.checkOsVersionInternal(
+      'TestFuncsWrapper.init',
+      iOS: (false, (2, 0, 0)),
+      macOS: (false, (10, 0, 0)),
+    );
+    final $ret = _objc_msgSend_151sglz(
+      object$.ref.retainAndReturnPointer(),
+      _sel_init,
+    );
+    return TestFuncsWrapper.fromPointer($ret, retain: false, release: true);
+  }
+}