[IR generator] Prepare IrElementTransformerVoid for auto-generation

This commit does two things:
- Reorders methods so that after we enable auto-generation the git diff
  is clearer
- Adds explicit return types to all `IrElementTransformerVoid` methods
  for the same purpose

No semantic changes in this commit.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/visitors/IrElementTransformerVoid.kt

@@ -22,314 +22,6 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.*
 
 abstract class IrElementTransformerVoid : IrElementTransformer<Nothing?> {
-    open fun visitElement(element: IrElement): IrElement {
-        element.transformChildren(this, null)
-        return element
-    }
-
-    final override fun visitElement(element: IrElement, data: Nothing?): IrElement = visitElement(element)
-
-    open fun visitModuleFragment(declaration: IrModuleFragment): IrModuleFragment {
-        declaration.transformChildren(this, null)
-        return declaration
-    }
-
-    final override fun visitModuleFragment(declaration: IrModuleFragment, data: Nothing?): IrModuleFragment =
-        visitModuleFragment(declaration)
-
-    open fun visitPackageFragment(declaration: IrPackageFragment): IrPackageFragment {
-        declaration.transformChildren(this, null)
-        return declaration
-    }
-
-    final override fun visitPackageFragment(declaration: IrPackageFragment, data: Nothing?): IrElement = visitPackageFragment(declaration)
-
-    open fun visitFile(declaration: IrFile): IrFile = visitPackageFragment(declaration) as IrFile
-    final override fun visitFile(declaration: IrFile, data: Nothing?): IrFile = visitFile(declaration)
-
-    open fun visitExternalPackageFragment(declaration: IrExternalPackageFragment): IrExternalPackageFragment =
-        visitPackageFragment(declaration) as IrExternalPackageFragment
-
-    final override fun visitExternalPackageFragment(declaration: IrExternalPackageFragment, data: Nothing?): IrExternalPackageFragment =
-        visitExternalPackageFragment(declaration)
-
-    open fun visitDeclaration(declaration: IrDeclarationBase): IrStatement {
-        declaration.transformChildren(this, null)
-        return declaration
-    }
-
-    final override fun visitDeclaration(declaration: IrDeclarationBase, data: Nothing?): IrStatement = visitDeclaration(declaration)
-
-    open fun visitScript(declaration: IrScript) = visitDeclaration(declaration)
-    final override fun visitScript(declaration: IrScript, data: Nothing?) = visitScript(declaration)
-
-    open fun visitClass(declaration: IrClass) = visitDeclaration(declaration)
-    final override fun visitClass(declaration: IrClass, data: Nothing?) = visitClass(declaration)
-
-    open fun visitFunction(declaration: IrFunction) = visitDeclaration(declaration)
-    final override fun visitFunction(declaration: IrFunction, data: Nothing?) = visitFunction(declaration)
-
-    open fun visitSimpleFunction(declaration: IrSimpleFunction) = visitFunction(declaration)
-    final override fun visitSimpleFunction(declaration: IrSimpleFunction, data: Nothing?) = visitSimpleFunction(declaration)
-
-    open fun visitConstructor(declaration: IrConstructor) = visitFunction(declaration)
-    final override fun visitConstructor(declaration: IrConstructor, data: Nothing?) = visitConstructor(declaration)
-
-    open fun visitProperty(declaration: IrProperty) = visitDeclaration(declaration)
-    final override fun visitProperty(declaration: IrProperty, data: Nothing?) = visitProperty(declaration)
-
-    open fun visitField(declaration: IrField) = visitDeclaration(declaration)
-    final override fun visitField(declaration: IrField, data: Nothing?) = visitField(declaration)
-
-    open fun visitLocalDelegatedProperty(declaration: IrLocalDelegatedProperty) = visitDeclaration(declaration)
-    final override fun visitLocalDelegatedProperty(declaration: IrLocalDelegatedProperty, data: Nothing?) =
-        visitLocalDelegatedProperty(declaration)
-
-    open fun visitEnumEntry(declaration: IrEnumEntry) = visitDeclaration(declaration)
-    final override fun visitEnumEntry(declaration: IrEnumEntry, data: Nothing?) = visitEnumEntry(declaration)
-
-    open fun visitAnonymousInitializer(declaration: IrAnonymousInitializer) = visitDeclaration(declaration)
-    final override fun visitAnonymousInitializer(declaration: IrAnonymousInitializer, data: Nothing?) =
-        visitAnonymousInitializer(declaration)
-
-    open fun visitTypeParameter(declaration: IrTypeParameter) = visitDeclaration(declaration)
-    final override fun visitTypeParameter(declaration: IrTypeParameter, data: Nothing?): IrStatement = visitTypeParameter(declaration)
-
-    open fun visitValueParameter(declaration: IrValueParameter) = visitDeclaration(declaration)
-    final override fun visitValueParameter(declaration: IrValueParameter, data: Nothing?): IrStatement = visitValueParameter(declaration)
-
-    open fun visitVariable(declaration: IrVariable) = visitDeclaration(declaration)
-    final override fun visitVariable(declaration: IrVariable, data: Nothing?) = visitVariable(declaration)
-
-    open fun visitTypeAlias(declaration: IrTypeAlias) = visitDeclaration(declaration)
-    final override fun visitTypeAlias(declaration: IrTypeAlias, data: Nothing?) = visitTypeAlias(declaration)
-
-    open fun visitBody(body: IrBody): IrBody {
-        body.transformChildren(this, null)
-        return body
-    }
-
-    final override fun visitBody(body: IrBody, data: Nothing?): IrBody = visitBody(body)
-
-    open fun visitExpressionBody(body: IrExpressionBody) = visitBody(body)
-    final override fun visitExpressionBody(body: IrExpressionBody, data: Nothing?) = visitExpressionBody(body)
-
-    open fun visitBlockBody(body: IrBlockBody) = visitBody(body)
-    final override fun visitBlockBody(body: IrBlockBody, data: Nothing?) = visitBlockBody(body)
-
-    open fun visitSyntheticBody(body: IrSyntheticBody) = visitBody(body)
-    final override fun visitSyntheticBody(body: IrSyntheticBody, data: Nothing?) = visitSyntheticBody(body)
-
-    open fun visitSuspendableExpression(expression: IrSuspendableExpression) = visitExpression(expression)
-    final override fun visitSuspendableExpression(expression: IrSuspendableExpression, data: Nothing?) =
-        visitSuspendableExpression(expression)
-
-    open fun visitSuspensionPoint(expression: IrSuspensionPoint) = visitExpression(expression)
-    final override fun visitSuspensionPoint(expression: IrSuspensionPoint, data: Nothing?) = visitSuspensionPoint(expression)
-
-    open fun visitExpression(expression: IrExpression): IrExpression {
-        expression.transformChildren(this, null)
-        return expression
-    }
-
-    final override fun visitExpression(expression: IrExpression, data: Nothing?): IrExpression = visitExpression(expression)
-
-    open fun visitConst(expression: IrConst<*>) = visitExpression(expression)
-    final override fun visitConst(expression: IrConst<*>, data: Nothing?) = visitConst(expression)
-
-    open fun visitConstantValue(expression: IrConstantValue): IrConstantValue {
-        expression.transformChildren(this, null)
-        return expression
-    }
-
-    final override fun visitConstantValue(expression: IrConstantValue, data: Nothing?) = visitConstantValue(expression)
-
-    open fun visitConstantObject(expression: IrConstantObject) = visitConstantValue(expression)
-    final override fun visitConstantObject(expression: IrConstantObject, data: Nothing?) = visitConstantObject(expression)
-
-    open fun visitConstantPrimitive(expression: IrConstantPrimitive) = visitConstantValue(expression)
-    final override fun visitConstantPrimitive(expression: IrConstantPrimitive, data: Nothing?) = visitConstantPrimitive(expression)
-
-    open fun visitConstantArray(expression: IrConstantArray) = visitConstantValue(expression)
-    final override fun visitConstantArray(expression: IrConstantArray, data: Nothing?) = visitConstantArray(expression)
-
-    open fun visitVararg(expression: IrVararg) = visitExpression(expression)
-    final override fun visitVararg(expression: IrVararg, data: Nothing?) = visitVararg(expression)
-
-    open fun visitSpreadElement(spread: IrSpreadElement): IrSpreadElement {
-        spread.transformChildren(this, null)
-        return spread
-    }
-
-    final override fun visitSpreadElement(spread: IrSpreadElement, data: Nothing?): IrSpreadElement = visitSpreadElement(spread)
-
-    open fun visitContainerExpression(expression: IrContainerExpression) = visitExpression(expression)
-    final override fun visitContainerExpression(expression: IrContainerExpression, data: Nothing?) = visitContainerExpression(expression)
-
-    open fun visitBlock(expression: IrBlock) = visitContainerExpression(expression)
-    final override fun visitBlock(expression: IrBlock, data: Nothing?) = visitBlock(expression)
-
-    open fun visitComposite(expression: IrComposite) = visitContainerExpression(expression)
-    final override fun visitComposite(expression: IrComposite, data: Nothing?) = visitComposite(expression)
-
-    open fun visitStringConcatenation(expression: IrStringConcatenation) = visitExpression(expression)
-    final override fun visitStringConcatenation(expression: IrStringConcatenation, data: Nothing?) = visitStringConcatenation(expression)
-
-    open fun visitDeclarationReference(expression: IrDeclarationReference) = visitExpression(expression)
-    final override fun visitDeclarationReference(expression: IrDeclarationReference, data: Nothing?) = visitDeclarationReference(expression)
-
-    open fun visitSingletonReference(expression: IrGetSingletonValue) = visitDeclarationReference(expression)
-    final override fun visitSingletonReference(expression: IrGetSingletonValue, data: Nothing?) = visitSingletonReference(expression)
-
-    open fun visitGetObjectValue(expression: IrGetObjectValue) = visitSingletonReference(expression)
-    final override fun visitGetObjectValue(expression: IrGetObjectValue, data: Nothing?) = visitGetObjectValue(expression)
-
-    open fun visitGetEnumValue(expression: IrGetEnumValue) = visitSingletonReference(expression)
-    final override fun visitGetEnumValue(expression: IrGetEnumValue, data: Nothing?) = visitGetEnumValue(expression)
-
-    open fun visitValueAccess(expression: IrValueAccessExpression) = visitDeclarationReference(expression)
-    final override fun visitValueAccess(expression: IrValueAccessExpression, data: Nothing?) = visitValueAccess(expression)
-
-    open fun visitGetValue(expression: IrGetValue) = visitValueAccess(expression)
-    final override fun visitGetValue(expression: IrGetValue, data: Nothing?) = visitGetValue(expression)
-
-    open fun visitSetValue(expression: IrSetValue) = visitValueAccess(expression)
-    final override fun visitSetValue(expression: IrSetValue, data: Nothing?) = visitSetValue(expression)
-
-    open fun visitFieldAccess(expression: IrFieldAccessExpression) = visitDeclarationReference(expression)
-    final override fun visitFieldAccess(expression: IrFieldAccessExpression, data: Nothing?) = visitFieldAccess(expression)
-
-    open fun visitGetField(expression: IrGetField) = visitFieldAccess(expression)
-    final override fun visitGetField(expression: IrGetField, data: Nothing?) = visitGetField(expression)
-
-    open fun visitSetField(expression: IrSetField) = visitFieldAccess(expression)
-    final override fun visitSetField(expression: IrSetField, data: Nothing?) = visitSetField(expression)
-
-    open fun visitMemberAccess(expression: IrMemberAccessExpression<*>) = visitDeclarationReference(expression)
-    final override fun visitMemberAccess(expression: IrMemberAccessExpression<*>, data: Nothing?) = visitMemberAccess(expression)
-
-    open fun visitFunctionAccess(expression: IrFunctionAccessExpression) = visitMemberAccess(expression)
-    final override fun visitFunctionAccess(expression: IrFunctionAccessExpression, data: Nothing?) = visitFunctionAccess(expression)
-
-    open fun visitCall(expression: IrCall) = visitFunctionAccess(expression)
-    final override fun visitCall(expression: IrCall, data: Nothing?) = visitCall(expression)
-
-    open fun visitConstructorCall(expression: IrConstructorCall) = visitFunctionAccess(expression)
-    final override fun visitConstructorCall(expression: IrConstructorCall, data: Nothing?) = visitConstructorCall(expression)
-
-    open fun visitDelegatingConstructorCall(expression: IrDelegatingConstructorCall) = visitFunctionAccess(expression)
-    final override fun visitDelegatingConstructorCall(expression: IrDelegatingConstructorCall, data: Nothing?) =
-        visitDelegatingConstructorCall(expression)
-
-    open fun visitEnumConstructorCall(expression: IrEnumConstructorCall) = visitFunctionAccess(expression)
-    final override fun visitEnumConstructorCall(expression: IrEnumConstructorCall, data: Nothing?) = visitEnumConstructorCall(expression)
-
-    open fun visitGetClass(expression: IrGetClass) = visitExpression(expression)
-    final override fun visitGetClass(expression: IrGetClass, data: Nothing?) = visitGetClass(expression)
-
-    open fun visitCallableReference(expression: IrCallableReference<*>) = visitMemberAccess(expression)
-    final override fun visitCallableReference(expression: IrCallableReference<*>, data: Nothing?) = visitCallableReference(expression)
-
-    open fun visitFunctionReference(expression: IrFunctionReference) = visitCallableReference(expression)
-    final override fun visitFunctionReference(expression: IrFunctionReference, data: Nothing?): IrElement =
-        visitFunctionReference(expression)
-
-    open fun visitPropertyReference(expression: IrPropertyReference) = visitCallableReference(expression)
-    final override fun visitPropertyReference(expression: IrPropertyReference, data: Nothing?): IrElement =
-        visitPropertyReference(expression)
-
-    open fun visitLocalDelegatedPropertyReference(expression: IrLocalDelegatedPropertyReference) = visitCallableReference(expression)
-    final override fun visitLocalDelegatedPropertyReference(expression: IrLocalDelegatedPropertyReference, data: Nothing?) =
-        visitLocalDelegatedPropertyReference(expression)
-
-    open fun visitRawFunctionReference(expression: IrRawFunctionReference) = visitDeclarationReference(expression)
-    final override fun visitRawFunctionReference(expression: IrRawFunctionReference, data: Nothing?) =
-        visitRawFunctionReference(expression)
-
-    open fun visitFunctionExpression(expression: IrFunctionExpression) = visitExpression(expression)
-    final override fun visitFunctionExpression(expression: IrFunctionExpression, data: Nothing?): IrElement =
-        visitFunctionExpression(expression)
-
-    open fun visitClassReference(expression: IrClassReference) = visitDeclarationReference(expression)
-    final override fun visitClassReference(expression: IrClassReference, data: Nothing?) = visitClassReference(expression)
-
-    open fun visitInstanceInitializerCall(expression: IrInstanceInitializerCall) = visitExpression(expression)
-    final override fun visitInstanceInitializerCall(expression: IrInstanceInitializerCall, data: Nothing?) =
-        visitInstanceInitializerCall(expression)
-
-    open fun visitTypeOperator(expression: IrTypeOperatorCall) = visitExpression(expression)
-    final override fun visitTypeOperator(expression: IrTypeOperatorCall, data: Nothing?) = visitTypeOperator(expression)
-
-    open fun visitWhen(expression: IrWhen) = visitExpression(expression)
-    final override fun visitWhen(expression: IrWhen, data: Nothing?) = visitWhen(expression)
-
-    open fun visitBranch(branch: IrBranch): IrBranch {
-        branch.transformChildren(this, null)
-        return branch
-    }
-
-    final override fun visitBranch(branch: IrBranch, data: Nothing?): IrBranch = visitBranch(branch)
-
-    open fun visitElseBranch(branch: IrElseBranch): IrElseBranch {
-        branch.transformChildren(this, null)
-        return branch
-    }
-
-    final override fun visitElseBranch(branch: IrElseBranch, data: Nothing?): IrElseBranch = visitElseBranch(branch)
-
-    open fun visitLoop(loop: IrLoop) = visitExpression(loop)
-    final override fun visitLoop(loop: IrLoop, data: Nothing?) = visitLoop(loop)
-
-    open fun visitWhileLoop(loop: IrWhileLoop) = visitLoop(loop)
-    final override fun visitWhileLoop(loop: IrWhileLoop, data: Nothing?) = visitWhileLoop(loop)
-
-    open fun visitDoWhileLoop(loop: IrDoWhileLoop) = visitLoop(loop)
-    final override fun visitDoWhileLoop(loop: IrDoWhileLoop, data: Nothing?) = visitDoWhileLoop(loop)
-
-    open fun visitTry(aTry: IrTry) = visitExpression(aTry)
-    final override fun visitTry(aTry: IrTry, data: Nothing?) = visitTry(aTry)
-
-    open fun visitCatch(aCatch: IrCatch): IrCatch {
-        aCatch.transformChildren(this, null)
-        return aCatch
-    }
-
-    final override fun visitCatch(aCatch: IrCatch, data: Nothing?): IrCatch = visitCatch(aCatch)
-
-    open fun visitBreakContinue(jump: IrBreakContinue) = visitExpression(jump)
-    final override fun visitBreakContinue(jump: IrBreakContinue, data: Nothing?) = visitBreakContinue(jump)
-
-    open fun visitBreak(jump: IrBreak) = visitBreakContinue(jump)
-    final override fun visitBreak(jump: IrBreak, data: Nothing?) = visitBreak(jump)
-
-    open fun visitContinue(jump: IrContinue) = visitBreakContinue(jump)
-    final override fun visitContinue(jump: IrContinue, data: Nothing?) = visitContinue(jump)
-
-    open fun visitReturn(expression: IrReturn) = visitExpression(expression)
-    final override fun visitReturn(expression: IrReturn, data: Nothing?) = visitReturn(expression)
-
-    open fun visitThrow(expression: IrThrow) = visitExpression(expression)
-    final override fun visitThrow(expression: IrThrow, data: Nothing?) = visitThrow(expression)
-
-    open fun visitDynamicExpression(expression: IrDynamicExpression) = visitExpression(expression)
-    final override fun visitDynamicExpression(expression: IrDynamicExpression, data: Nothing?) = visitDynamicExpression(expression)
-
-    open fun visitDynamicOperatorExpression(expression: IrDynamicOperatorExpression) = visitDynamicExpression(expression)
-    final override fun visitDynamicOperatorExpression(expression: IrDynamicOperatorExpression, data: Nothing?) =
-        visitDynamicOperatorExpression(expression)
-
-    open fun visitDynamicMemberExpression(expression: IrDynamicMemberExpression) = visitDynamicExpression(expression)
-    final override fun visitDynamicMemberExpression(expression: IrDynamicMemberExpression, data: Nothing?) =
-        visitDynamicMemberExpression(expression)
-
-    open fun visitErrorDeclaration(declaration: IrErrorDeclaration) = visitDeclaration(declaration)
-    final override fun visitErrorDeclaration(declaration: IrErrorDeclaration, data: Nothing?) = visitErrorDeclaration(declaration)
-
-    open fun visitErrorExpression(expression: IrErrorExpression) = visitExpression(expression)
-    final override fun visitErrorExpression(expression: IrErrorExpression, data: Nothing?) = visitErrorExpression(expression)
-
-    open fun visitErrorCallExpression(expression: IrErrorCallExpression) = visitErrorExpression(expression)
-    final override fun visitErrorCallExpression(expression: IrErrorCallExpression, data: Nothing?) = visitErrorCallExpression(expression)
 
     protected inline fun <T : IrElement> T.transformPostfix(body: T.() -> Unit): T {
         transformChildrenVoid()
@@ -340,6 +32,527 @@ abstract class IrElementTransformerVoid : IrElementTransformer<Nothing?> {
     protected fun IrElement.transformChildrenVoid() {
         transformChildrenVoid(this@IrElementTransformerVoid)
     }
+
+    open fun visitElement(element: IrElement): IrElement {
+        element.transformChildren(this, null)
+        return element
+    }
+
+    final override fun visitElement(element: IrElement, data: Nothing?): IrElement =
+        visitElement(element)
+
+    open fun visitDeclaration(declaration: IrDeclarationBase): IrStatement {
+        declaration.transformChildren(this, null)
+        return declaration
+    }
+
+    final override fun visitDeclaration(declaration: IrDeclarationBase, data: Nothing?): IrStatement =
+        visitDeclaration(declaration)
+
+    open fun visitValueParameter(declaration: IrValueParameter): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitValueParameter(declaration: IrValueParameter, data: Nothing?): IrStatement =
+        visitValueParameter(declaration)
+
+    open fun visitClass(declaration: IrClass): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitClass(declaration: IrClass, data: Nothing?): IrStatement =
+        visitClass(declaration)
+
+    open fun visitAnonymousInitializer(declaration: IrAnonymousInitializer): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitAnonymousInitializer(declaration: IrAnonymousInitializer, data: Nothing?): IrStatement =
+        visitAnonymousInitializer(declaration)
+
+    open fun visitTypeParameter(declaration: IrTypeParameter): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitTypeParameter(declaration: IrTypeParameter, data: Nothing?): IrStatement =
+        visitTypeParameter(declaration)
+
+    open fun visitFunction(declaration: IrFunction): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitFunction(declaration: IrFunction, data: Nothing?): IrStatement =
+        visitFunction(declaration)
+
+    open fun visitConstructor(declaration: IrConstructor): IrStatement =
+        visitFunction(declaration)
+
+    final override fun visitConstructor(declaration: IrConstructor, data: Nothing?): IrStatement =
+        visitConstructor(declaration)
+
+    open fun visitEnumEntry(declaration: IrEnumEntry): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitEnumEntry(declaration: IrEnumEntry, data: Nothing?): IrStatement =
+        visitEnumEntry(declaration)
+
+    open fun visitErrorDeclaration(declaration: IrErrorDeclaration): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitErrorDeclaration(declaration: IrErrorDeclaration, data: Nothing?): IrStatement =
+        visitErrorDeclaration(declaration)
+
+    open fun visitField(declaration: IrField): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitField(declaration: IrField, data: Nothing?): IrStatement =
+        visitField(declaration)
+
+    open fun visitLocalDelegatedProperty(declaration: IrLocalDelegatedProperty): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitLocalDelegatedProperty(declaration: IrLocalDelegatedProperty, data: Nothing?): IrStatement =
+        visitLocalDelegatedProperty(declaration)
+
+    open fun visitModuleFragment(declaration: IrModuleFragment): IrModuleFragment {
+        declaration.transformChildren(this, null)
+        return declaration
+    }
+
+    final override fun visitModuleFragment(declaration: IrModuleFragment, data: Nothing?): IrModuleFragment =
+        visitModuleFragment(declaration)
+
+    open fun visitProperty(declaration: IrProperty): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitProperty(declaration: IrProperty, data: Nothing?): IrStatement =
+        visitProperty(declaration)
+
+    open fun visitScript(declaration: IrScript): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitScript(declaration: IrScript, data: Nothing?): IrStatement =
+        visitScript(declaration)
+
+    open fun visitSimpleFunction(declaration: IrSimpleFunction): IrStatement =
+        visitFunction(declaration)
+
+    final override fun visitSimpleFunction(declaration: IrSimpleFunction, data: Nothing?): IrStatement =
+        visitSimpleFunction(declaration)
+
+    open fun visitTypeAlias(declaration: IrTypeAlias): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitTypeAlias(declaration: IrTypeAlias, data: Nothing?): IrStatement =
+        visitTypeAlias(declaration)
+
+    open fun visitVariable(declaration: IrVariable): IrStatement =
+        visitDeclaration(declaration)
+
+    final override fun visitVariable(declaration: IrVariable, data: Nothing?): IrStatement =
+        visitVariable(declaration)
+
+    open fun visitPackageFragment(declaration: IrPackageFragment): IrPackageFragment {
+        declaration.transformChildren(this, null)
+        return declaration
+    }
+
+    final override fun visitPackageFragment(declaration: IrPackageFragment, data: Nothing?): IrElement =
+        visitPackageFragment(declaration)
+
+    open fun visitExternalPackageFragment(declaration: IrExternalPackageFragment): IrExternalPackageFragment =
+        visitPackageFragment(declaration) as IrExternalPackageFragment
+
+    final override fun visitExternalPackageFragment(declaration: IrExternalPackageFragment, data: Nothing?): IrExternalPackageFragment =
+        visitExternalPackageFragment(declaration)
+
+    open fun visitFile(declaration: IrFile): IrFile =
+        visitPackageFragment(declaration) as IrFile
+
+    final override fun visitFile(declaration: IrFile, data: Nothing?): IrFile =
+        visitFile(declaration)
+
+    open fun visitExpression(expression: IrExpression): IrExpression {
+        expression.transformChildren(this, null)
+        return expression
+    }
+
+    final override fun visitExpression(expression: IrExpression, data: Nothing?): IrExpression =
+        visitExpression(expression)
+
+    open fun visitBody(body: IrBody): IrBody {
+        body.transformChildren(this, null)
+        return body
+    }
+
+    final override fun visitBody(body: IrBody, data: Nothing?): IrBody =
+        visitBody(body)
+
+    open fun visitExpressionBody(body: IrExpressionBody): IrBody =
+        visitBody(body)
+
+    final override fun visitExpressionBody(body: IrExpressionBody, data: Nothing?): IrBody =
+        visitExpressionBody(body)
+
+    open fun visitBlockBody(body: IrBlockBody): IrBody =
+        visitBody(body)
+
+    final override fun visitBlockBody(body: IrBlockBody, data: Nothing?): IrBody =
+        visitBlockBody(body)
+
+    open fun visitDeclarationReference(expression: IrDeclarationReference): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitDeclarationReference(expression: IrDeclarationReference, data: Nothing?): IrExpression =
+        visitDeclarationReference(expression)
+
+    open fun visitMemberAccess(expression: IrMemberAccessExpression<*>): IrExpression =
+        visitDeclarationReference(expression)
+
+    final override fun visitMemberAccess(expression: IrMemberAccessExpression<*>, data: Nothing?): IrExpression =
+        visitMemberAccess(expression)
+
+    open fun visitFunctionAccess(expression: IrFunctionAccessExpression): IrExpression =
+        visitMemberAccess(expression)
+
+    final override fun visitFunctionAccess(expression: IrFunctionAccessExpression, data: Nothing?): IrExpression =
+        visitFunctionAccess(expression)
+
+    open fun visitConstructorCall(expression: IrConstructorCall): IrExpression =
+        visitFunctionAccess(expression)
+
+    final override fun visitConstructorCall(expression: IrConstructorCall, data: Nothing?): IrExpression =
+        visitConstructorCall(expression)
+
+    open fun visitSingletonReference(expression: IrGetSingletonValue): IrExpression =
+        visitDeclarationReference(expression)
+
+    final override fun visitSingletonReference(expression: IrGetSingletonValue, data: Nothing?): IrExpression =
+        visitSingletonReference(expression)
+
+    open fun visitGetObjectValue(expression: IrGetObjectValue): IrExpression =
+        visitSingletonReference(expression)
+
+    final override fun visitGetObjectValue(expression: IrGetObjectValue, data: Nothing?): IrExpression =
+        visitGetObjectValue(expression)
+
+    open fun visitGetEnumValue(expression: IrGetEnumValue): IrExpression =
+        visitSingletonReference(expression)
+
+    final override fun visitGetEnumValue(expression: IrGetEnumValue, data: Nothing?): IrExpression =
+        visitGetEnumValue(expression)
+
+    open fun visitRawFunctionReference(expression: IrRawFunctionReference): IrExpression =
+        visitDeclarationReference(expression)
+
+    final override fun visitRawFunctionReference(expression: IrRawFunctionReference, data: Nothing?): IrExpression =
+        visitRawFunctionReference(expression)
+
+    open fun visitContainerExpression(expression: IrContainerExpression): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitContainerExpression(expression: IrContainerExpression, data: Nothing?): IrExpression =
+        visitContainerExpression(expression)
+
+    open fun visitBlock(expression: IrBlock): IrExpression =
+        visitContainerExpression(expression)
+
+    final override fun visitBlock(expression: IrBlock, data: Nothing?): IrExpression =
+        visitBlock(expression)
+
+    open fun visitComposite(expression: IrComposite): IrExpression =
+        visitContainerExpression(expression)
+
+    final override fun visitComposite(expression: IrComposite, data: Nothing?): IrExpression =
+        visitComposite(expression)
+
+    open fun visitSyntheticBody(body: IrSyntheticBody): IrBody =
+        visitBody(body)
+
+    final override fun visitSyntheticBody(body: IrSyntheticBody, data: Nothing?): IrBody =
+        visitSyntheticBody(body)
+
+    open fun visitBreakContinue(jump: IrBreakContinue): IrExpression =
+        visitExpression(jump)
+
+    final override fun visitBreakContinue(jump: IrBreakContinue, data: Nothing?): IrExpression =
+        visitBreakContinue(jump)
+
+    open fun visitBreak(jump: IrBreak): IrExpression =
+        visitBreakContinue(jump)
+
+    final override fun visitBreak(jump: IrBreak, data: Nothing?): IrExpression =
+        visitBreak(jump)
+
+    open fun visitContinue(jump: IrContinue): IrExpression =
+        visitBreakContinue(jump)
+
+    final override fun visitContinue(jump: IrContinue, data: Nothing?): IrExpression =
+        visitContinue(jump)
+
+    open fun visitCall(expression: IrCall): IrExpression =
+        visitFunctionAccess(expression)
+
+    final override fun visitCall(expression: IrCall, data: Nothing?): IrExpression =
+        visitCall(expression)
+
+    open fun visitCallableReference(expression: IrCallableReference<*>): IrExpression =
+        visitMemberAccess(expression)
+
+    final override fun visitCallableReference(expression: IrCallableReference<*>, data: Nothing?): IrExpression =
+        visitCallableReference(expression)
+
+    open fun visitFunctionReference(expression: IrFunctionReference): IrExpression =
+        visitCallableReference(expression)
+
+    final override fun visitFunctionReference(expression: IrFunctionReference, data: Nothing?): IrElement =
+        visitFunctionReference(expression)
+
+    open fun visitPropertyReference(expression: IrPropertyReference): IrExpression =
+        visitCallableReference(expression)
+
+    final override fun visitPropertyReference(expression: IrPropertyReference, data: Nothing?): IrElement =
+        visitPropertyReference(expression)
+
+    open fun visitLocalDelegatedPropertyReference(expression: IrLocalDelegatedPropertyReference): IrExpression =
+        visitCallableReference(expression)
+
+    final override fun visitLocalDelegatedPropertyReference(expression: IrLocalDelegatedPropertyReference, data: Nothing?): IrExpression =
+        visitLocalDelegatedPropertyReference(expression)
+
+    open fun visitClassReference(expression: IrClassReference): IrExpression =
+        visitDeclarationReference(expression)
+
+    final override fun visitClassReference(expression: IrClassReference, data: Nothing?): IrExpression =
+        visitClassReference(expression)
+
+    open fun visitConst(expression: IrConst<*>): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitConst(expression: IrConst<*>, data: Nothing?): IrExpression =
+        visitConst(expression)
+
+    open fun visitConstantValue(expression: IrConstantValue): IrConstantValue {
+        expression.transformChildren(this, null)
+        return expression
+    }
+
+    final override fun visitConstantValue(expression: IrConstantValue, data: Nothing?): IrConstantValue =
+        visitConstantValue(expression)
+
+    open fun visitConstantPrimitive(expression: IrConstantPrimitive): IrConstantValue =
+        visitConstantValue(expression)
+
+    final override fun visitConstantPrimitive(expression: IrConstantPrimitive, data: Nothing?): IrConstantValue =
+        visitConstantPrimitive(expression)
+
+    open fun visitConstantObject(expression: IrConstantObject): IrConstantValue =
+        visitConstantValue(expression)
+
+    final override fun visitConstantObject(expression: IrConstantObject, data: Nothing?): IrConstantValue {
+        return visitConstantObject(expression)
+    }
+
+    open fun visitConstantArray(expression: IrConstantArray): IrConstantValue =
+        visitConstantValue(expression)
+
+    final override fun visitConstantArray(expression: IrConstantArray, data: Nothing?): IrConstantValue =
+        visitConstantArray(expression)
+
+    open fun visitDelegatingConstructorCall(expression: IrDelegatingConstructorCall): IrExpression =
+        visitFunctionAccess(expression)
+
+    final override fun visitDelegatingConstructorCall(expression: IrDelegatingConstructorCall, data: Nothing?): IrExpression =
+        visitDelegatingConstructorCall(expression)
+
+    open fun visitDynamicExpression(expression: IrDynamicExpression): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitDynamicExpression(expression: IrDynamicExpression, data: Nothing?): IrExpression =
+        visitDynamicExpression(expression)
+
+    open fun visitDynamicOperatorExpression(expression: IrDynamicOperatorExpression): IrExpression =
+        visitDynamicExpression(expression)
+
+    final override fun visitDynamicOperatorExpression(expression: IrDynamicOperatorExpression, data: Nothing?): IrExpression =
+        visitDynamicOperatorExpression(expression)
+
+    open fun visitDynamicMemberExpression(expression: IrDynamicMemberExpression): IrExpression =
+        visitDynamicExpression(expression)
+
+    final override fun visitDynamicMemberExpression(expression: IrDynamicMemberExpression, data: Nothing?): IrExpression =
+        visitDynamicMemberExpression(expression)
+
+    open fun visitEnumConstructorCall(expression: IrEnumConstructorCall): IrExpression =
+        visitFunctionAccess(expression)
+
+    final override fun visitEnumConstructorCall(expression: IrEnumConstructorCall, data: Nothing?): IrExpression =
+        visitEnumConstructorCall(expression)
+
+    open fun visitErrorExpression(expression: IrErrorExpression): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitErrorExpression(expression: IrErrorExpression, data: Nothing?): IrExpression =
+        visitErrorExpression(expression)
+
+    open fun visitErrorCallExpression(expression: IrErrorCallExpression): IrExpression =
+        visitErrorExpression(expression)
+
+    final override fun visitErrorCallExpression(expression: IrErrorCallExpression, data: Nothing?): IrExpression =
+        visitErrorCallExpression(expression)
+
+    open fun visitFieldAccess(expression: IrFieldAccessExpression): IrExpression =
+        visitDeclarationReference(expression)
+
+    final override fun visitFieldAccess(expression: IrFieldAccessExpression, data: Nothing?): IrExpression =
+        visitFieldAccess(expression)
+
+    open fun visitGetField(expression: IrGetField): IrExpression =
+        visitFieldAccess(expression)
+
+    final override fun visitGetField(expression: IrGetField, data: Nothing?): IrExpression =
+        visitGetField(expression)
+
+    open fun visitSetField(expression: IrSetField): IrExpression =
+        visitFieldAccess(expression)
+
+    final override fun visitSetField(expression: IrSetField, data: Nothing?): IrExpression =
+        visitSetField(expression)
+
+    open fun visitFunctionExpression(expression: IrFunctionExpression): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitFunctionExpression(expression: IrFunctionExpression, data: Nothing?): IrElement =
+        visitFunctionExpression(expression)
+
+    open fun visitGetClass(expression: IrGetClass): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitGetClass(expression: IrGetClass, data: Nothing?): IrExpression =
+        visitGetClass(expression)
+
+    open fun visitInstanceInitializerCall(expression: IrInstanceInitializerCall): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitInstanceInitializerCall(expression: IrInstanceInitializerCall, data: Nothing?): IrExpression =
+        visitInstanceInitializerCall(expression)
+
+    open fun visitLoop(loop: IrLoop): IrExpression =
+        visitExpression(loop)
+
+    final override fun visitLoop(loop: IrLoop, data: Nothing?): IrExpression =
+        visitLoop(loop)
+
+    open fun visitWhileLoop(loop: IrWhileLoop): IrExpression =
+        visitLoop(loop)
+
+    final override fun visitWhileLoop(loop: IrWhileLoop, data: Nothing?): IrExpression =
+        visitWhileLoop(loop)
+
+    open fun visitDoWhileLoop(loop: IrDoWhileLoop): IrExpression =
+        visitLoop(loop)
+
+    final override fun visitDoWhileLoop(loop: IrDoWhileLoop, data: Nothing?): IrExpression =
+        visitDoWhileLoop(loop)
+
+    open fun visitReturn(expression: IrReturn): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitReturn(expression: IrReturn, data: Nothing?): IrExpression =
+        visitReturn(expression)
+
+    open fun visitStringConcatenation(expression: IrStringConcatenation): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitStringConcatenation(expression: IrStringConcatenation, data: Nothing?): IrExpression =
+        visitStringConcatenation(expression)
+
+    open fun visitSuspensionPoint(expression: IrSuspensionPoint): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitSuspensionPoint(expression: IrSuspensionPoint, data: Nothing?): IrExpression =
+        visitSuspensionPoint(expression)
+
+    open fun visitSuspendableExpression(expression: IrSuspendableExpression): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitSuspendableExpression(expression: IrSuspendableExpression, data: Nothing?): IrExpression =
+        visitSuspendableExpression(expression)
+
+    open fun visitThrow(expression: IrThrow): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitThrow(expression: IrThrow, data: Nothing?): IrExpression =
+        visitThrow(expression)
+
+    open fun visitTry(aTry: IrTry): IrExpression =
+        visitExpression(aTry)
+
+    final override fun visitTry(aTry: IrTry, data: Nothing?): IrExpression =
+        visitTry(aTry)
+
+    open fun visitCatch(aCatch: IrCatch): IrCatch {
+        aCatch.transformChildren(this, null)
+        return aCatch
+    }
+
+    final override fun visitCatch(aCatch: IrCatch, data: Nothing?): IrCatch =
+        visitCatch(aCatch)
+
+    open fun visitTypeOperator(expression: IrTypeOperatorCall): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitTypeOperator(expression: IrTypeOperatorCall, data: Nothing?): IrExpression =
+        visitTypeOperator(expression)
+
+    open fun visitValueAccess(expression: IrValueAccessExpression): IrExpression =
+        visitDeclarationReference(expression)
+
+    final override fun visitValueAccess(expression: IrValueAccessExpression, data: Nothing?): IrExpression =
+        visitValueAccess(expression)
+
+    open fun visitGetValue(expression: IrGetValue): IrExpression =
+        visitValueAccess(expression)
+
+    final override fun visitGetValue(expression: IrGetValue, data: Nothing?): IrExpression =
+        visitGetValue(expression)
+
+    open fun visitSetValue(expression: IrSetValue): IrExpression =
+        visitValueAccess(expression)
+
+    final override fun visitSetValue(expression: IrSetValue, data: Nothing?): IrExpression =
+        visitSetValue(expression)
+
+    open fun visitVararg(expression: IrVararg): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitVararg(expression: IrVararg, data: Nothing?): IrExpression =
+        visitVararg(expression)
+
+    open fun visitSpreadElement(spread: IrSpreadElement): IrSpreadElement {
+        spread.transformChildren(this, null)
+        return spread
+    }
+
+    final override fun visitSpreadElement(spread: IrSpreadElement, data: Nothing?): IrSpreadElement =
+        visitSpreadElement(spread)
+
+    open fun visitWhen(expression: IrWhen): IrExpression =
+        visitExpression(expression)
+
+    final override fun visitWhen(expression: IrWhen, data: Nothing?): IrExpression =
+        visitWhen(expression)
+
+    open fun visitBranch(branch: IrBranch): IrBranch {
+        branch.transformChildren(this, null)
+        return branch
+    }
+
+    final override fun visitBranch(branch: IrBranch, data: Nothing?): IrBranch =
+        visitBranch(branch)
+
+    open fun visitElseBranch(branch: IrElseBranch): IrElseBranch {
+        branch.transformChildren(this, null)
+        return branch
+    }
+
+    final override fun visitElseBranch(branch: IrElseBranch, data: Nothing?): IrElseBranch =
+        visitElseBranch(branch)
 }
 
 fun IrElement.transformChildrenVoid(transformer: IrElementTransformerVoid) {