[ObjCExport] Add extras to ObjCExportStub for proper @Throws translation

KT-66239

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

@@ -0,0 +1,15 @@
+package org.jetbrains.kotlin.objcexport.extras
+
+import org.jetbrains.kotlin.backend.konan.objcexport.ObjCExportStub
+import org.jetbrains.kotlin.tooling.core.Extras
+import org.jetbrains.kotlin.tooling.core.MutableExtras
+import org.jetbrains.kotlin.tooling.core.mutableExtrasOf
+
+internal object ObjCExportStubExtrasBuilderContext
+
+/**
+ * Convenience function for building extras for [ObjCExportStub]
+ */
+internal fun objCExportStubExtras(builder: context(ObjCExportStubExtrasBuilderContext) MutableExtras.() -> Unit): Extras {
+    return mutableExtrasOf().also { extras -> builder(ObjCExportStubExtrasBuilderContext, extras) }
+}

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

@@ -0,0 +1,25 @@
+package org.jetbrains.kotlin.objcexport.extras
+
+import org.jetbrains.kotlin.backend.konan.objcexport.ObjCExportStub
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.tooling.core.MutableExtras
+import org.jetbrains.kotlin.tooling.core.extrasKeyOf
+
+private val throwsAnnotationClassIdsKey = extrasKeyOf<List<ClassId>?>()
+
+/**
+ * Functions and constructors can have [Throws] annotations which lists exceptions.
+ * This lists of exceptions needs to be translated and forwarded as dependencies
+ */
+internal val ObjCExportStub.throwsAnnotationClassIds: List<ClassId>?
+    get() {
+        extras[throwsAnnotationClassIdsKey]?.let { return it }
+        return null
+    }
+
+context(ObjCExportStubExtrasBuilderContext)
+internal var MutableExtras.throwsAnnotationClassIds: List<ClassId>?
+    get() = this[throwsAnnotationClassIdsKey]
+    set(value) {
+        this[throwsAnnotationClassIdsKey] = value
+    }

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

@@ -14,6 +14,7 @@ import org.jetbrains.kotlin.objcexport.KtObjCExportHeaderGenerator.QueueElement
 import org.jetbrains.kotlin.objcexport.analysisApiUtils.*
 import org.jetbrains.kotlin.objcexport.extras.originClassId
 import org.jetbrains.kotlin.objcexport.extras.requiresForwardDeclaration
+import org.jetbrains.kotlin.objcexport.extras.throwsAnnotationClassIds
 import org.jetbrains.kotlin.psi.KtFile
 
 
@@ -181,6 +182,11 @@ private class KtObjCExportHeaderGenerator {
      * and `Array` has to be registered as forward declaration.
      */
     private fun enqueueDependencyClasses(stub: ObjCExportStub) {
+
+        symbolDeque += stub.closureSequence()
+            .flatMap { child -> child.throwsAnnotationClassIds.orEmpty() }
+            .map { QueueElement.Class(it) }
+
         symbolDeque += stub.closureSequence()
             .mapNotNull { child ->
                 when (child) {

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

@@ -13,6 +13,8 @@ import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.objcexport.Predefined.anyMethodSelectors
 import org.jetbrains.kotlin.objcexport.Predefined.anyMethodSwiftNames
 import org.jetbrains.kotlin.objcexport.analysisApiUtils.*
+import org.jetbrains.kotlin.objcexport.extras.objCExportStubExtras
+import org.jetbrains.kotlin.objcexport.extras.throwsAnnotationClassIds
 
 internal val KtCallableSymbol.isConstructor: Boolean
     get() = this is KtConstructorSymbol
@@ -50,7 +52,8 @@ internal fun KtFunctionLikeSymbol.buildObjCMethod(
     val swiftName = getSwiftName(bridge)
     val attributes = mutableListOf<String>()
     val returnBridge = bridge.returnBridge
-    val comment = this.translateToObjCComment(bridge, parameters)
+    val comment = translateToObjCComment(bridge, parameters)
+    val throws = definedThrows.map { it }.toList()
 
     attributes += getSwiftPrivateAttribute() ?: swiftNameAttribute(swiftName)
 
@@ -81,7 +84,10 @@ internal fun KtFunctionLikeSymbol.buildObjCMethod(
         returnType = returnType,
         selectors = selectors,
         parameters = parameters,
-        attributes = attributes
+        attributes = attributes,
+        extras = objCExportStubExtras {
+            throwsAnnotationClassIds = throws
+        }
     )
 }
 
@@ -257,7 +263,6 @@ fun MethodBridge.valueParametersAssociated(
     function: KtFunctionLikeSymbol,
 ): List<Pair<MethodBridgeValueParameter, KtValueParameterSymbol?>> {
     val allParameters = function.valueParameters
-    if (allParameters.isEmpty()) return emptyList()
 
     return this.valueParameters.mapIndexed { index, valueParameterBridge ->
         when (valueParameterBridge) {