[SIR generator] Add SirVisitorVoid class

This is convenient for cases when the visitor has no context to pass to
each method

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/printer/ElementPrinter.kt

@@ -10,10 +10,7 @@ import org.jetbrains.kotlin.fir.tree.generator.context.AbstractFirTreeBuilder
 import org.jetbrains.kotlin.fir.tree.generator.model.Element
 import org.jetbrains.kotlin.fir.tree.generator.model.Field
 import org.jetbrains.kotlin.generators.tree.*
-import org.jetbrains.kotlin.generators.tree.printer.printAcceptChildrenMethod
-import org.jetbrains.kotlin.generators.tree.printer.printAcceptMethod
-import org.jetbrains.kotlin.generators.tree.printer.printTransformChildrenMethod
-import org.jetbrains.kotlin.generators.tree.printer.printTransformMethod
+import org.jetbrains.kotlin.generators.tree.printer.*
 import org.jetbrains.kotlin.utils.SmartPrinter
 
 internal class ElementPrinter(printer: SmartPrinter) : AbstractElementPrinter<Element, Field>(printer) {
@@ -69,8 +66,7 @@ internal class ElementPrinter(printer: SmartPrinter) : AbstractElementPrinter<El
 
             if (element.isRootElement) {
                 println()
-                println("fun accept(visitor: ", firVisitorVoidType.render(), ") = accept(visitor, null)")
-
+                printAcceptVoidMethod(firVisitorVoidType)
                 printAcceptChildrenMethod(
                     element = element,
                     visitorClass = firVisitorType,
@@ -78,8 +74,7 @@ internal class ElementPrinter(printer: SmartPrinter) : AbstractElementPrinter<El
                 )
                 println()
                 println()
-                println("fun acceptChildren(visitor: ", firVisitorVoidType.render(), ") = acceptChildren(visitor, null)")
-
+                printAcceptChildrenVoidMethod(firVisitorVoidType)
                 printTransformChildrenMethod(
                     element = element,
                     transformerClass = firTransformerType,

generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractVisitorVoidPrinter.kt

@@ -60,8 +60,8 @@ abstract class AbstractVisitorVoidPrinter<Element, Field>(
                 element,
                 hasDataParameter = false,
                 modality = when {
-                    element.isRootElement && visitorType.kind == TypeKind.Class -> Modality.ABSTRACT
-                    !element.isRootElement && visitorType.kind == TypeKind.Class -> Modality.OPEN
+                    isAbstractVisitRootElementMethod && visitorType.kind == TypeKind.Class -> Modality.ABSTRACT
+                    !isAbstractVisitRootElementMethod && visitorType.kind == TypeKind.Class -> Modality.OPEN
                     else -> null
                 }
             )

generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/printer/printUtils.kt

@@ -348,4 +348,18 @@ fun SmartPrinter.printTransformChildrenMethod(
     )
 }
 
+context(ImportCollector)
+fun SmartPrinter.printAcceptVoidMethod(visitorType: ClassRef<*>) {
+    val visitorParameter = FunctionParameter("visitor", visitorType)
+    printFunctionDeclaration("accept", listOf(visitorParameter), StandardTypes.unit)
+    println(" = accept(", visitorParameter.name, ", null)")
+}
+
+context(ImportCollector)
+fun SmartPrinter.printAcceptChildrenVoidMethod(visitorType: ClassRef<*>) {
+    val visitorParameter = FunctionParameter("visitor", visitorType)
+    printFunctionDeclaration("acceptChildren", listOf(visitorParameter), StandardTypes.unit)
+    println(" = acceptChildren(", visitorParameter.name, ", null)")
+}
+
 fun AbstractField<*>.call(): String = if (nullable) "?." else "."

native/swift/sir/gen/org/jetbrains/kotlin/sir/SirElement.kt

@@ -10,6 +10,7 @@ package org.jetbrains.kotlin.sir
 
 import org.jetbrains.kotlin.sir.visitors.SirTransformer
 import org.jetbrains.kotlin.sir.visitors.SirVisitor
+import org.jetbrains.kotlin.sir.visitors.SirVisitorVoid
 
 /**
  * The root interface of the Swift IR tree.
@@ -37,6 +38,8 @@ sealed interface SirElement {
     fun <E : SirElement, D> transform(transformer: SirTransformer<D>, data: D): E =
         transformer.transformElement(this, data) as E
 
+    fun accept(visitor: SirVisitorVoid) = accept(visitor, null)
+
     /**
      * Runs the provided [visitor] on subtrees with roots in this node's children.
      *
@@ -49,6 +52,8 @@ sealed interface SirElement {
      */
     fun <R, D> acceptChildren(visitor: SirVisitor<R, D>, data: D)
 
+    fun acceptChildren(visitor: SirVisitorVoid) = acceptChildren(visitor, null)
+
     /**
      * Recursively transforms this node's children *in place* using [transformer].
      *

native/swift/sir/gen/org/jetbrains/kotlin/sir/visitors/SirVisitorVoid.kt

@@ -0,0 +1,104 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+// This file was generated automatically. See native/swift/sir/tree-generator/Readme.md.
+// DO NOT MODIFY IT MANUALLY.
+
+package org.jetbrains.kotlin.sir.visitors
+
+import org.jetbrains.kotlin.sir.*
+
+/**
+ * Auto-generated by [org.jetbrains.kotlin.sir.tree.generator.printer.VisitorVoidPrinter]
+ */
+abstract class SirVisitorVoid : SirVisitor<Unit, Nothing?>() {
+
+    final override fun visitElement(element: SirElement, data: Nothing?) {
+        visitElement(element)
+    }
+
+    open fun visitElement(element: SirElement) {
+    }
+
+    final override fun visitModule(module: SirModule, data: Nothing?) {
+        visitModule(module)
+    }
+
+    open fun visitModule(module: SirModule) {
+        visitElement(module)
+    }
+
+    final override fun visitDeclarationContainer(declarationContainer: SirDeclarationContainer, data: Nothing?) {
+        visitDeclarationContainer(declarationContainer)
+    }
+
+    open fun visitDeclarationContainer(declarationContainer: SirDeclarationContainer) {
+        visitElement(declarationContainer)
+    }
+
+    final override fun visitDeclaration(declaration: SirDeclaration, data: Nothing?) {
+        visitDeclaration(declaration)
+    }
+
+    open fun visitDeclaration(declaration: SirDeclaration) {
+        visitElement(declaration)
+    }
+
+    final override fun visitForeignDeclaration(foreignDeclaration: SirForeignDeclaration, data: Nothing?) {
+        visitForeignDeclaration(foreignDeclaration)
+    }
+
+    open fun visitForeignDeclaration(foreignDeclaration: SirForeignDeclaration) {
+        visitDeclaration(foreignDeclaration)
+    }
+
+    final override fun visitNamedDeclaration(namedDeclaration: SirNamedDeclaration, data: Nothing?) {
+        visitNamedDeclaration(namedDeclaration)
+    }
+
+    open fun visitNamedDeclaration(namedDeclaration: SirNamedDeclaration) {
+        visitDeclaration(namedDeclaration)
+    }
+
+    final override fun visitEnum(enum: SirEnum, data: Nothing?) {
+        visitEnum(enum)
+    }
+
+    open fun visitEnum(enum: SirEnum) {
+        visitNamedDeclaration(enum)
+    }
+
+    final override fun visitStruct(struct: SirStruct, data: Nothing?) {
+        visitStruct(struct)
+    }
+
+    open fun visitStruct(struct: SirStruct) {
+        visitNamedDeclaration(struct)
+    }
+
+    final override fun visitCallable(callable: SirCallable, data: Nothing?) {
+        visitCallable(callable)
+    }
+
+    open fun visitCallable(callable: SirCallable) {
+        visitDeclaration(callable)
+    }
+
+    final override fun visitFunction(function: SirFunction, data: Nothing?) {
+        visitFunction(function)
+    }
+
+    open fun visitFunction(function: SirFunction) {
+        visitCallable(function)
+    }
+
+    final override fun visitForeignFunction(foreignFunction: SirForeignFunction, data: Nothing?) {
+        visitForeignFunction(foreignFunction)
+    }
+
+    open fun visitForeignFunction(foreignFunction: SirForeignFunction) {
+        visitCallable(foreignFunction)
+    }
+}

native/swift/sir/tree-generator/src/org/jetbrains/kotlin/sir/tree/generator/Main.kt

@@ -27,6 +27,7 @@ fun main(args: Array<String>) {
         ::ElementPrinter,
         listOf(
             elementVisitorType to ::VisitorPrinter,
+            elementVisitorVoidType to ::VisitorVoidPrinter,
             elementTransformerType to ::TransformerPrinter.bind(model.rootElement),
         ),
         ImplementationConfigurator,

native/swift/sir/tree-generator/src/org/jetbrains/kotlin/sir/tree/generator/Types.kt

@@ -18,6 +18,7 @@ val enumCaseType = type(BASE_PACKAGE, "SirEnumCase", TypeKind.Class)
 private const val VISITORS_PACKAGE = "$BASE_PACKAGE.visitors"
 
 val elementVisitorType = type(VISITORS_PACKAGE, "SirVisitor", TypeKind.Class)
+val elementVisitorVoidType = type(VISITORS_PACKAGE, "SirVisitorVoid", TypeKind.Class)
 val elementTransformerType = type(VISITORS_PACKAGE, "SirTransformer", TypeKind.Class)
 
 val swiftIrImplementationDetailAnnotation = type(BASE_PACKAGE, "SirImplementationDetail", TypeKind.Class)

native/swift/sir/tree-generator/src/org/jetbrains/kotlin/sir/tree/generator/printer/ElementPrinter.kt

@@ -7,13 +7,12 @@ package org.jetbrains.kotlin.sir.tree.generator.printer
 
 import org.jetbrains.kotlin.generators.tree.*
 import org.jetbrains.kotlin.generators.tree.printer.*
-import org.jetbrains.kotlin.sir.tree.generator.BASE_PACKAGE
 import org.jetbrains.kotlin.sir.tree.generator.SwiftIrTree
-import org.jetbrains.kotlin.sir.tree.generator.model.Element
-import org.jetbrains.kotlin.sir.tree.generator.model.Field
 import org.jetbrains.kotlin.sir.tree.generator.elementTransformerType
 import org.jetbrains.kotlin.sir.tree.generator.elementVisitorType
-import org.jetbrains.kotlin.sir.tree.generator.model.SimpleField
+import org.jetbrains.kotlin.sir.tree.generator.elementVisitorVoidType
+import org.jetbrains.kotlin.sir.tree.generator.model.Element
+import org.jetbrains.kotlin.sir.tree.generator.model.Field
 import org.jetbrains.kotlin.utils.SmartPrinter
 
 internal class ElementPrinter(printer: SmartPrinter) : AbstractElementPrinter<Element, Field>(printer) {
@@ -37,8 +36,12 @@ internal class ElementPrinter(printer: SmartPrinter) : AbstractElementPrinter<El
         }
 
         if (element.isRootElement) {
+            println()
+            printAcceptVoidMethod(elementVisitorVoidType)
             printAcceptChildrenMethod(element, elementVisitorType, TypeVariable("R"))
             println()
+            println()
+            printAcceptChildrenVoidMethod(elementVisitorVoidType)
             printTransformChildrenMethod(element, elementTransformerType, StandardTypes.unit)
             println()
         }

native/swift/sir/tree-generator/src/org/jetbrains/kotlin/sir/tree/generator/printer/VisitorVoidPrinter.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.sir.tree.generator.printer
+
+import org.jetbrains.kotlin.generators.tree.AbstractVisitorVoidPrinter
+import org.jetbrains.kotlin.generators.tree.ClassRef
+import org.jetbrains.kotlin.generators.tree.PositionTypeParameterRef
+import org.jetbrains.kotlin.sir.tree.generator.elementVisitorType
+import org.jetbrains.kotlin.sir.tree.generator.model.Element
+import org.jetbrains.kotlin.sir.tree.generator.model.Field
+import org.jetbrains.kotlin.utils.SmartPrinter
+
+internal class VisitorVoidPrinter(
+    printer: SmartPrinter,
+    override val visitorType: ClassRef<*>,
+) : AbstractVisitorVoidPrinter<Element, Field>(printer) {
+
+    override val visitorSuperClass: ClassRef<PositionTypeParameterRef>
+        get() = elementVisitorType
+
+    override val useAbstractMethodForRootElement: Boolean
+        get() = false
+
+    override val overriddenVisitMethodsAreFinal: Boolean
+        get() = true
+}