IR: remove IrElementVisitorVoidWithContext

It was only used as a superclass in IrInlineReferenceLocator and
LocalDeclarationsLowering. In both cases it's clearer and more optimal
to pass the necessary data via the visitor 'data' variable.

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/IrElementTransformerVoidWithContext.kt

@@ -21,9 +21,11 @@ import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.builders.Scope
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.symbols.*
+import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
+import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
+import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
+import org.jetbrains.kotlin.ir.symbols.IrScriptSymbol
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
-import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 
 open class ScopeWithIr(val scope: Scope, val irElement: IrElement)
 
@@ -139,98 +141,3 @@ abstract class IrElementTransformerVoidWithContext : IrElementTransformerVoid()
         return super.visitScript(declaration)
     }
 }
-
-@OptIn(ObsoleteDescriptorBasedAPI::class)
-abstract class IrElementVisitorVoidWithContext : IrElementVisitorVoid {
-
-    private val scopeStack = mutableListOf<ScopeWithIr>()
-
-    protected open fun createScope(declaration: IrSymbolOwner): ScopeWithIr =
-        ScopeWithIr(Scope(declaration.symbol), declaration)
-
-    final override fun visitFile(declaration: IrFile) {
-        scopeStack.push(createScope(declaration))
-        visitFileNew(declaration)
-        scopeStack.pop()
-    }
-
-    final override fun visitClass(declaration: IrClass) {
-        scopeStack.push(createScope(declaration))
-        visitClassNew(declaration)
-        scopeStack.pop()
-    }
-
-    final override fun visitProperty(declaration: IrProperty) {
-        scopeStack.push(createScope(declaration))
-        visitPropertyNew(declaration)
-        scopeStack.pop()
-    }
-
-    final override fun visitField(declaration: IrField) {
-        val isDelegated = declaration.descriptor.isDelegated
-        if (isDelegated) scopeStack.push(createScope(declaration))
-        visitFieldNew(declaration)
-        if (isDelegated) scopeStack.pop()
-    }
-
-    final override fun visitFunction(declaration: IrFunction) {
-        scopeStack.push(createScope(declaration))
-        visitFunctionNew(declaration)
-        scopeStack.pop()
-    }
-
-    final override fun visitAnonymousInitializer(declaration: IrAnonymousInitializer) {
-        scopeStack.push(createScope(declaration))
-        visitAnonymousInitializerNew(declaration)
-        scopeStack.pop()
-    }
-
-    final override fun visitValueParameter(declaration: IrValueParameter) {
-        scopeStack.push(createScope(declaration))
-        visitValueParameterNew(declaration)
-        scopeStack.pop()
-    }
-
-    protected val currentFile get() = scopeStack.lastOrNull { it.scope.scopeOwnerSymbol is IrFileSymbol }
-    protected val currentClass get() = scopeStack.lastOrNull { it.scope.scopeOwnerSymbol is IrClassSymbol }
-    protected val currentFunction get() = scopeStack.lastOrNull { it.scope.scopeOwnerSymbol is IrFunctionSymbol }
-    protected val currentProperty get() = scopeStack.lastOrNull { it.scope.scopeOwnerSymbol is IrPropertySymbol }
-    protected val currentAnonymousInitializer get() = scopeStack.lastOrNull { it.scope.scopeOwnerSymbol is IrAnonymousInitializer }
-    protected val currentValueParameter get() = scopeStack.lastOrNull { it.scope.scopeOwnerSymbol is IrValueParameter }
-    protected val currentScope get() = scopeStack.peek()
-    protected val parentScope get() = if (scopeStack.size < 2) null else scopeStack[scopeStack.size - 2]
-    protected val allScopes get() = scopeStack
-
-    @ObsoleteDescriptorBasedAPI
-    fun printScopeStack() {
-        scopeStack.forEach { println(it.scope.scopeOwner) }
-    }
-
-    open fun visitFileNew(declaration: IrFile) {
-        super.visitFile(declaration)
-    }
-
-    open fun visitClassNew(declaration: IrClass) {
-        super.visitClass(declaration)
-    }
-
-    open fun visitFunctionNew(declaration: IrFunction) {
-        super.visitFunction(declaration)
-    }
-
-    open fun visitPropertyNew(declaration: IrProperty) {
-        super.visitProperty(declaration)
-    }
-
-    open fun visitFieldNew(declaration: IrField) {
-        super.visitField(declaration)
-    }
-
-    open fun visitAnonymousInitializerNew(declaration: IrAnonymousInitializer) {
-        super.visitAnonymousInitializer(declaration)
-    }
-
-    open fun visitValueParameterNew(declaration: IrValueParameter) {
-        super.visitValueParameter(declaration)
-    }
-}

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LocalDeclarationsLowering.kt

@@ -5,15 +5,16 @@
 
 package org.jetbrains.kotlin.backend.common.lower
 
-import org.jetbrains.kotlin.backend.common.*
+import org.jetbrains.kotlin.backend.common.BodyLoweringPass
+import org.jetbrains.kotlin.backend.common.CommonBackendContext
 import org.jetbrains.kotlin.backend.common.descriptors.synthesizedString
 import org.jetbrains.kotlin.backend.common.ir.*
+import org.jetbrains.kotlin.backend.common.runOnFilePostfix
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.ReceiverParameterDescriptor
 import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.ir.*
-import org.jetbrains.kotlin.ir.builders.Scope
 import org.jetbrains.kotlin.ir.builders.declarations.buildConstructor
 import org.jetbrains.kotlin.ir.builders.declarations.buildField
 import org.jetbrains.kotlin.ir.builders.declarations.buildFun
@@ -33,8 +34,7 @@ import org.jetbrains.kotlin.ir.util.file
 import org.jetbrains.kotlin.ir.util.parentAsClass
 import org.jetbrains.kotlin.ir.util.render
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
-import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
-import org.jetbrains.kotlin.ir.visitors.acceptVoid
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.utils.addToStdlib.safeAs
@@ -109,7 +109,7 @@ class LocalDeclarationsLowering(
         LocalDeclarationsTransformer(irElement, container, classesToLower).lowerLocalDeclarations()
     }
 
-    internal class ScopeWithCounter(scope: Scope, irElement: IrElement) : ScopeWithIr(scope, irElement) {
+    internal class ScopeWithCounter(val irElement: IrElement) {
         // Continuous numbering across all declarations in the container.
         var counter: Int = 0
         val usedLocalFunctionNames: MutableSet<Name> = hashSetOf()
@@ -122,7 +122,7 @@ class LocalDeclarationsLowering(
     // Need to keep LocalFunctionContext.index
     private val IrSymbolOwner.scopeWithCounter: ScopeWithCounter
         get() = context.ir.localScopeWithCounterMap.scopeMap.getOrPut(this) {
-            ScopeWithCounter(Scope(symbol), this)
+            ScopeWithCounter(this)
         }
 
     private abstract class LocalContext {
@@ -857,66 +857,70 @@ class LocalDeclarationsLowering(
                 currentParent as? IrClass
             }
 
-            irElement.acceptVoid(object : IrElementVisitorVoidWithContext() {
-                override fun visitElement(element: IrElement) {
-                    element.acceptChildrenVoid(this)
+            class Data(val currentClass: ScopeWithCounter?, val isInInlineFunction: Boolean) {
+                fun withCurrentClass(currentClass: IrClass): Data =
+                    // Don't cache local declarations
+                    Data(ScopeWithCounter(currentClass), isInInlineFunction)
+
+                fun withInline(isInline: Boolean): Data =
+                    if (isInline && !isInInlineFunction) Data(currentClass, true) else this
+            }
+
+            irElement.accept(object : IrElementVisitor<Unit, Data> {
+                override fun visitElement(element: IrElement, data: Data) {
+                    element.acceptChildren(this, data)
                 }
 
-                override fun createScope(declaration: IrSymbolOwner): ScopeWithIr {
-                    return ScopeWithCounter(Scope(declaration.symbol), declaration) // Don't cache local declarations
-                }
-
-                override fun visitFunctionExpression(expression: IrFunctionExpression) {
+                override fun visitFunctionExpression(expression: IrFunctionExpression, data: Data) {
                     // TODO: For now IrFunctionExpression can only be encountered here if this was called from the inliner,
                     // then all IrFunctionExpression will be replaced by IrFunctionReferenceExpression.
                     // Don't forget to fix this when that replacement has been dropped.
                     // Also, a note: even if a lambda is not an inline one, there still cannot be a reference to it
                     // from an outside declaration, so it is safe to skip them here and correctly handle later, after the above conversion.
-                    expression.function.acceptChildrenVoid(this)
+                    expression.function.acceptChildren(this, data)
                 }
 
-                override fun visitSimpleFunction(declaration: IrSimpleFunction) {
-                    super.visitSimpleFunction(declaration)
+                override fun visitSimpleFunction(declaration: IrSimpleFunction, data: Data) {
+                    super.visitSimpleFunction(declaration, data.withInline(declaration.isInline))
 
                     if (declaration.visibility == Visibilities.LOCAL) {
-                        val enclosingScope =
+                        val enclosingScope = data.currentClass
+                            ?: enclosingClass?.scopeWithCounter
                             // File is required for K/N because file declarations are not split by classes.
-                            currentClass ?: enclosingClass?.scopeWithCounter ?: enclosingFile.scopeWithCounter
+                            ?: enclosingFile.scopeWithCounter
                         val index =
-                            if (enclosingScope is ScopeWithCounter &&
-                                (declaration.name.isSpecial || declaration.name in enclosingScope.usedLocalFunctionNames)
-                            ) enclosingScope.counter++ else -1
+                            if (declaration.name.isSpecial || declaration.name in enclosingScope.usedLocalFunctionNames)
+                                enclosingScope.counter++
+                            else -1
                         localFunctions[declaration] =
                             LocalFunctionContext(declaration, index, enclosingScope.irElement as IrDeclarationContainer)
-                        (enclosingScope as? ScopeWithCounter)?.usedLocalFunctionNames?.add(declaration.name)
+                        enclosingScope.usedLocalFunctionNames.add(declaration.name)
                     }
                 }
 
-                override fun visitConstructor(declaration: IrConstructor) {
-                    super.visitConstructor(declaration)
+                override fun visitConstructor(declaration: IrConstructor, data: Data) {
+                    super.visitConstructor(declaration, data)
 
                     if (!declaration.constructedClass.isLocalNotInner()) return
 
-                    localClassConstructors[declaration] = LocalClassConstructorContext(declaration, inInlineFunctionScope)
+                    localClassConstructors[declaration] = LocalClassConstructorContext(declaration, data.inInlineFunctionScope)
                 }
 
-                override fun visitClassNew(declaration: IrClass) {
+                override fun visitClass(declaration: IrClass, data: Data) {
                     if (classesToLower?.contains(declaration) == false) return
-                    super.visitClassNew(declaration)
+                    super.visitClass(declaration, data.withCurrentClass(declaration))
 
                     if (!declaration.isLocalNotInner()) return
 
-                    val localClassContext = LocalClassContext(declaration, inInlineFunctionScope)
-                    localClasses[declaration] = localClassContext
+                    localClasses[declaration] = LocalClassContext(declaration, data.inInlineFunctionScope)
                 }
 
-                private val inInlineFunctionScope: Boolean
-                    get() = allScopes.any { scope -> (scope.irElement as? IrFunction)?.isInline ?: false } ||
+                private val Data.inInlineFunctionScope: Boolean
+                    get() = isInInlineFunction ||
                             generateSequence(container) { it.parent as? IrDeclaration }.any { it is IrFunction && it.isInline }
-            })
+            }, Data(null, false))
         }
     }
-
 }
 
 // Local inner classes capture anything through outer

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/ir/IrInlineReferenceLocator.kt

@@ -5,25 +5,31 @@
 
 package org.jetbrains.kotlin.backend.jvm.ir
 
-import org.jetbrains.kotlin.backend.common.IrElementVisitorVoidWithContext
 import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
 import org.jetbrains.kotlin.backend.jvm.codegen.isInlineFunctionCall
 import org.jetbrains.kotlin.backend.jvm.codegen.isInlineIrExpression
 import org.jetbrains.kotlin.ir.util.isLambda
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.IrDeclaration
+import org.jetbrains.kotlin.ir.declarations.IrDeclarationBase
 import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrValueParameter
 import org.jetbrains.kotlin.ir.expressions.IrBlock
 import org.jetbrains.kotlin.ir.expressions.IrCallableReference
 import org.jetbrains.kotlin.ir.expressions.IrFunctionAccessExpression
 import org.jetbrains.kotlin.ir.expressions.IrFunctionReference
-import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
-internal open class IrInlineReferenceLocator(private val context: JvmBackendContext) : IrElementVisitorVoidWithContext() {
-    override fun visitElement(element: IrElement) = element.acceptChildrenVoid(this)
+internal open class IrInlineReferenceLocator(private val context: JvmBackendContext) : IrElementVisitor<Unit, IrDeclaration?> {
+    override fun visitElement(element: IrElement, data: IrDeclaration?) {
+        element.acceptChildren(this, data)
+    }
 
-    override fun visitFunctionAccess(expression: IrFunctionAccessExpression) {
+    override fun visitDeclaration(declaration: IrDeclarationBase, data: IrDeclaration?) {
+        declaration.acceptChildren(this, declaration)
+    }
+
+    override fun visitFunctionAccess(expression: IrFunctionAccessExpression, data: IrDeclaration?) {
         val function = expression.symbol.owner
         if (function.isInlineFunctionCall(context)) {
             for (parameter in function.valueParameters) {
@@ -36,13 +42,13 @@ internal open class IrInlineReferenceLocator(private val context: JvmBackendCont
 
                 if (valueArgument is IrBlock && valueArgument.origin.isLambda) {
                     val reference = valueArgument.statements.last() as IrFunctionReference
-                    visitInlineLambda(reference, function, parameter, currentScope!!.irElement as IrDeclaration)
+                    visitInlineLambda(reference, function, parameter, data!!)
                 } else if (valueArgument is IrCallableReference<*>) {
                     visitInlineReference(valueArgument)
                 }
             }
         }
-        return super.visitFunctionAccess(expression)
+        return super.visitFunctionAccess(expression, data)
     }
 
     open fun visitInlineReference(argument: IrCallableReference<*>) {}

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/AddContinuationLowering.kt

@@ -41,7 +41,6 @@ import org.jetbrains.kotlin.ir.types.impl.makeTypeProjection
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
-import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 import org.jetbrains.kotlin.load.java.JavaVisibilities
 import org.jetbrains.kotlin.name.Name
@@ -96,13 +95,13 @@ private class AddContinuationLowering(private val context: JvmBackendContext) :
     private fun transformSuspendLambdasIntoContinuations(irFile: IrFile) {
         val inlineReferences = mutableSetOf<IrCallableReference<*>>()
         val suspendLambdas = mutableMapOf<IrFunctionReference, SuspendLambdaInfo>()
-        irFile.acceptChildrenVoid(object : IrInlineReferenceLocator(context) {
+        irFile.acceptChildren(object : IrInlineReferenceLocator(context) {
             override fun visitInlineReference(argument: IrCallableReference<*>) {
                 inlineReferences.add(argument)
             }
 
-            override fun visitFunctionReference(expression: IrFunctionReference) {
-                expression.acceptChildrenVoid(this)
+            override fun visitFunctionReference(expression: IrFunctionReference, data: IrDeclaration?) {
+                expression.acceptChildren(this, data)
                 if (expression.isSuspend && expression.shouldBeTreatedAsSuspendLambda() && expression !in inlineReferences) {
                     val isRestricted = expression.symbol.owner.extensionReceiverParameter?.type?.classOrNull?.owner?.annotations?.any {
                         it.type.classOrNull?.signature == IdSignature.PublicSignature("kotlin.coroutines", "RestrictsSuspension", null, 0)
@@ -115,7 +114,7 @@ private class AddContinuationLowering(private val context: JvmBackendContext) :
                 origin == IrStatementOrigin.LAMBDA ||
                         origin == IrStatementOrigin.ADAPTED_FUNCTION_REFERENCE ||
                         origin == IrStatementOrigin.SUSPEND_CONVERSION
-        })
+        }, null)
 
         for (lambda in suspendLambdas.values) {
             (lambda.function.parent as IrDeclarationContainer).declarations.remove(lambda.function)

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/FakeInliningLocalVariablesLowering.kt

@@ -19,8 +19,6 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.IrBlockBody
 import org.jetbrains.kotlin.ir.expressions.IrExpressionBody
 import org.jetbrains.kotlin.ir.expressions.IrFunctionReference
-import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
-import org.jetbrains.kotlin.ir.visitors.acceptVoid
 import org.jetbrains.kotlin.load.java.JvmAbi
 
 internal val fakeInliningLocalVariablesLowering = makeIrFilePhase(
@@ -31,11 +29,11 @@ internal val fakeInliningLocalVariablesLowering = makeIrFilePhase(
 
 internal class FakeInliningLocalVariablesLowering(val context: JvmBackendContext) : IrInlineReferenceLocator(context), FileLoweringPass {
     override fun lower(irFile: IrFile) {
-        irFile.acceptVoid(this)
+        irFile.accept(this, null)
     }
 
-    override fun visitFunctionNew(declaration: IrFunction) {
-        declaration.acceptChildrenVoid(this)
+    override fun visitFunction(declaration: IrFunction, data: IrDeclaration?) {
+        super.visitFunction(declaration, data)
         if (declaration.isInline && !declaration.origin.isSynthetic && declaration.body != null) {
             declaration.addFakeInliningLocalVariables()
         }