[ObjCExport] Support mapping of ObjCObject types to id

^KT-65167

native/objcexport-header-generator/impl/analysis-api/src/org/jetbrains/kotlin/objcexport/translateToObjCType.kt

@@ -15,6 +15,7 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.StandardClassIds
 import org.jetbrains.kotlin.objcexport.analysisApiUtils.getInlineTargetTypeOrNull
 import org.jetbrains.kotlin.objcexport.analysisApiUtils.isError
+import org.jetbrains.kotlin.objcexport.analysisApiUtils.isObjCObjectType
 import org.jetbrains.kotlin.objcexport.analysisApiUtils.objCErrorType
 
 
@@ -23,9 +24,6 @@ import org.jetbrains.kotlin.objcexport.analysisApiUtils.objCErrorType
  */
 context(KtAnalysisSession, KtObjCExportSession)
 internal fun KtType.translateToObjCType(typeBridge: TypeBridge): ObjCType {
-
-    //if (!this.isObjCObjectType()) return null //TODO implement isObjCObjectType
-
     return when (typeBridge) {
         is ReferenceBridge -> this.translateToObjCReferenceType()
         is BlockPointerBridge -> this.translateToObjCFunctionType(typeBridge)
@@ -87,6 +85,10 @@ private fun KtType.mapToReferenceTypeIgnoringNullability(): ObjCNonNullReference
         return ObjCIdType
     }
 
+    if (isObjCObjectType()) {
+        return ObjCIdType
+    }
+
     /* Check if inline type represents 'regular' inline class */
     run check@{
         if (classId == null) return@check

native/objcexport-header-generator/test/org/jetbrains/kotlin/backend/konan/tests/ObjCExportTypeTranslationTest.kt

@@ -457,6 +457,20 @@ class ObjCExportTypeTranslationTest(
         assertEquals("id -> void", header.renderTypesOfSymbol("foo"))
     }
 
+    @Test
+    fun `test - ObjCObject types`() {
+        val header = header(
+            """
+                class A: kotlinx.cinterop.ObjCObject
+                val foo : A get() = A
+                val bar: kotlinx.cinterop.ObjCObject
+            """.trimIndent()
+        )
+
+        assertEquals("id", header.renderTypesOfSymbol("foo"))
+        assertEquals("id", header.renderTypesOfSymbol("bar"))
+    }
+
     @Test
     fun `test - unresolved error type`() {
         val header = header(