[IR] Change value classes lowering dispatching strategy

Signed-off-by: Evgeniy.Zhelenskiy <Evgeniy.Zhelenskiy@jetbrains.com> #KT-1179
2023-03-29 07:46:05 +02:00
parent c1ac580031
commit 2535a87f85
15 changed files with 276 additions and 212 deletions
@@ -52149,6 +52149,12 @@ public class FirLightTreeBlackBoxCodegenTestGenerated extends AbstractFirLightTr
            runTest("compiler/testData/codegen/box/valueClasses/mutableSharedMfvcVar.kt");
        }

+        @Test
+        @TestMetadata("nestedLoweringStart.kt")
+        public void testNestedLoweringStart() throws Exception {
+            runTest("compiler/testData/codegen/box/valueClasses/nestedLoweringStart.kt");
+        }
+
        @Test
        @TestMetadata("nothingAsParameterType.kt")
        public void testNothingAsParameterType() throws Exception {
@@ -52149,6 +52149,12 @@ public class FirPsiBlackBoxCodegenTestGenerated extends AbstractFirPsiBlackBoxCo
            runTest("compiler/testData/codegen/box/valueClasses/mutableSharedMfvcVar.kt");
        }

+        @Test
+        @TestMetadata("nestedLoweringStart.kt")
+        public void testNestedLoweringStart() throws Exception {
+            runTest("compiler/testData/codegen/box/valueClasses/nestedLoweringStart.kt");
+        }
+
        @Test
        @TestMetadata("nothingAsParameterType.kt")
        public void testNothingAsParameterType() throws Exception {
@@ -10,7 +10,6 @@ import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
 import org.jetbrains.kotlin.backend.common.lower.irBlockBody
 import org.jetbrains.kotlin.backend.jvm.*
 import org.jetbrains.kotlin.backend.jvm.ir.erasedUpperBound
-import org.jetbrains.kotlin.backend.jvm.ir.isInlineClassType
 import org.jetbrains.kotlin.builtins.StandardNames
 import org.jetbrains.kotlin.config.ApiVersion
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
@@ -72,7 +71,6 @@ internal class JvmInlineClassLowering(

    override val specificMangle: SpecificMangle
        get() = SpecificMangle.Inline
-    override val IrType.needsHandling get() = isInlineClassType()
    override fun visitClassNewDeclarationsWhenParallel(declaration: IrDeclaration) = Unit

    override fun visitClassNew(declaration: IrClass): IrClass {
@@ -46,8 +46,6 @@ internal class JvmMultiFieldValueClassLowering(
    context: JvmBackendContext,
    scopeStack: MutableList<ScopeWithIr>,
 ) : JvmValueClassAbstractLowering(context, scopeStack) {
-    override val IrType.needsHandling: Boolean
-        get() = needsMfvcFlattening()

    private sealed class MfvcNodeInstanceAccessor {
        abstract val instance: MfvcNodeInstance
@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.backend.jvm.lower
 import org.jetbrains.kotlin.backend.common.*
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
 import org.jetbrains.kotlin.backend.jvm.*
+import org.jetbrains.kotlin.backend.jvm.ir.isValueClassType
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.builders.irReturn
@@ -15,6 +16,8 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.transformStatement
 import org.jetbrains.kotlin.ir.types.IrType
+import org.jetbrains.kotlin.ir.types.isNothing
+import org.jetbrains.kotlin.ir.types.makeNotNull
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 import org.jetbrains.kotlin.load.java.JvmAbi
@@ -243,68 +246,6 @@ internal abstract class JvmValueClassAbstractLowering(
    protected abstract fun createBridgeBody(source: IrSimpleFunction, target: IrSimpleFunction, original: IrFunction, inverted: Boolean)


-    // Functions for common lowering dispatching
-    private inner class NeedsToVisit : IrElementVisitor<Boolean, Nothing?> {
-        override fun visitElement(element: IrElement, data: Nothing?): Boolean = false
-        override fun visitClass(declaration: IrClass, data: Nothing?): Boolean =
-            declaration.isSpecificLoweringLogicApplicable() || declaration.declarations.any { it.accept(this, null) }
-
-        override fun visitFunction(declaration: IrFunction, data: Nothing?): Boolean =
-            replacements.quickCheckIfFunctionIsNotApplicable(declaration)
-
-        override fun visitFunctionReference(expression: IrFunctionReference, data: Nothing?): Boolean =
-            visitFunction(expression.symbol.owner, data)
-
-        override fun visitFunctionAccess(expression: IrFunctionAccessExpression, data: Nothing?): Boolean =
-            visitFunction(expression.symbol.owner, data)
-
-        override fun visitField(declaration: IrField, data: Nothing?): Boolean = declaration.type.needsHandling
-        override fun visitFieldAccess(expression: IrFieldAccessExpression, data: Nothing?): Boolean =
-            visitField(expression.symbol.owner, data)
-
-        override fun visitVariable(declaration: IrVariable, data: Nothing?): Boolean = visitValueDeclaration(declaration)
-
-        private fun visitValueDeclaration(declaration: IrValueDeclaration) = declaration.type.needsHandling
-        override fun visitValueParameter(declaration: IrValueParameter, data: Nothing?): Boolean = visitValueDeclaration(declaration)
-        override fun visitValueAccess(expression: IrValueAccessExpression, data: Nothing?): Boolean =
-            visitValueDeclaration(expression.symbol.owner)
-
-        override fun visitStringConcatenation(expression: IrStringConcatenation, data: Nothing?): Boolean = false
-        override fun visitReturn(expression: IrReturn, data: Nothing?): Boolean = (expression.returnTargetSymbol.owner as? IrFunction)
-            ?.let { replacements.quickCheckIfFunctionIsNotApplicable(it) } ?: false
-
-        override fun visitAnonymousInitializer(declaration: IrAnonymousInitializer, data: Nothing?): Boolean =
-            (declaration.parent as? IrClass)?.isSpecificLoweringLogicApplicable() == true
-
-        private fun visitStatementContainer(container: IrStatementContainer) = container.statements.any { it.accept(this, null) }
-
-        override fun visitContainerExpression(expression: IrContainerExpression, data: Nothing?): Boolean =
-            visitStatementContainer(expression)
-
-        override fun visitBlockBody(body: IrBlockBody, data: Nothing?): Boolean = visitStatementContainer(body)
-    }
-
-    internal fun needsToVisitClassNew(declaration: IrClass): Boolean = declaration.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitFunctionReference(expression: IrFunctionReference): Boolean = expression.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitFunctionAccess(expression: IrFunctionAccessExpression): Boolean = expression.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitCall(expression: IrCall): Boolean = expression.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitStringConcatenation(expression: IrStringConcatenation): Boolean = expression.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitGetField(expression: IrGetField): Boolean = expression.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitSetField(expression: IrSetField): Boolean = expression.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitGetValue(expression: IrGetValue): Boolean = expression.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitSetValue(expression: IrSetValue): Boolean = expression.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitVariable(declaration: IrVariable): Boolean = declaration.accept(NeedsToVisit(), null)
-
-    internal fun needsToVisitReturn(expression: IrReturn): Boolean = expression.accept(NeedsToVisit(), null)
    internal abstract fun visitClassNewDeclarationsWhenParallel(declaration: IrDeclaration)

    // forbid other overrides without modifying dispatcher file JvmValueClassLoweringDispatcher.kt
@@ -380,6 +321,4 @@ internal abstract class JvmValueClassAbstractLowering(
    final override fun visitErrorExpression(expression: IrErrorExpression) = super.visitErrorExpression(expression)
    final override fun visitErrorCallExpression(expression: IrErrorCallExpression) = super.visitErrorCallExpression(expression)

-
-    abstract val IrType.needsHandling: Boolean
 }
@@ -11,15 +11,21 @@ import org.jetbrains.kotlin.backend.common.ScopeWithIr
 import org.jetbrains.kotlin.backend.common.lower.loops.forLoopsPhase
 import org.jetbrains.kotlin.backend.common.phaser.makeIrFilePhase
 import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
+import org.jetbrains.kotlin.backend.jvm.MemoizedValueClassLoweringDispatcherSharedData.Access.Body
+import org.jetbrains.kotlin.backend.jvm.MemoizedValueClassLoweringDispatcherSharedData.Access.Header
+import org.jetbrains.kotlin.backend.jvm.ir.erasedUpperBound
 import org.jetbrains.kotlin.ir.IrElement
-import org.jetbrains.kotlin.ir.IrStatement
-import org.jetbrains.kotlin.ir.declarations.IrAnonymousInitializer
-import org.jetbrains.kotlin.ir.declarations.IrClass
-import org.jetbrains.kotlin.ir.declarations.IrFile
-import org.jetbrains.kotlin.ir.declarations.IrVariable
+import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.*
-import org.jetbrains.kotlin.ir.transformStatement
-import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
+import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
+import org.jetbrains.kotlin.ir.symbols.IrSymbol
+import org.jetbrains.kotlin.ir.types.IrSimpleType
+import org.jetbrains.kotlin.ir.types.IrType
+import org.jetbrains.kotlin.ir.types.classifierOrNull
+import org.jetbrains.kotlin.ir.types.typeOrNull
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
+import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
+import org.jetbrains.kotlin.ir.visitors.acceptVoid

 val jvmValueClassPhase = makeIrFilePhase(
    ::JvmValueClassLoweringDispatcher,
@@ -32,7 +38,8 @@ val jvmValueClassPhase = makeIrFilePhase(
    prerequisite = setOf(forLoopsPhase, jvmBuiltInsPhase, collectionStubMethodLowering, singleAbstractMethodPhase),
 )

-internal class JvmValueClassLoweringDispatcher(context: JvmBackendContext) : IrElementTransformerVoidWithContext(), FileLoweringPass {
+internal class JvmValueClassLoweringDispatcher(private val context: JvmBackendContext) : IrElementTransformerVoidWithContext(),
+    FileLoweringPass {
    override val scopeStack: MutableList<ScopeWithIr> = mutableListOf()
    private val inlineClassLowering: JvmInlineClassLowering = JvmInlineClassLowering(context, scopeStack)
    private val multiFieldValueClassLowering: JvmMultiFieldValueClassLowering = JvmMultiFieldValueClassLowering(context, scopeStack)
@@ -42,158 +49,177 @@ internal class JvmValueClassLoweringDispatcher(context: JvmBackendContext) : IrE
        irFile.transformChildrenVoid()
    }

-
-    private fun IrElement.requiresAnyHandling() =
-        requiresHandling(multiFieldValueClassLowering) || requiresHandling(inlineClassLowering)
-
-    override fun visitClassNew(declaration: IrClass): IrClass = if (declaration.requiresAnyHandling()) {
+    override fun visitClassNew(declaration: IrClass): IrClass = if (declaration.requiresHandling()) {
        declaration
            .let(multiFieldValueClassLowering::visitClassNew)
            .let(inlineClassLowering::visitClassNew)
    } else {
-        declaration.transformChildrenVoid()
-        for (innerDeclaration in declaration.declarations) {
-            multiFieldValueClassLowering.visitClassNewDeclarationsWhenParallel(innerDeclaration)
-        }
-        for (innerDeclaration in declaration.declarations) {
-            inlineClassLowering.visitClassNewDeclarationsWhenParallel(innerDeclaration)
-        }
        declaration
    }

-    private fun transformExpressionConsequently(expression: IrExpression) = expression
-        .transform(multiFieldValueClassLowering, null)
-        .transform(inlineClassLowering, null)
+    private fun IrElement.requiresHandling(): Boolean {
+        val visitor = NeedsToVisit(context)
+        accept(visitor, null)
+        return visitor.result
+    }
+}

-    private fun transformStatementConsequently(statement: IrStatement) = statement
-        .transformStatement(multiFieldValueClassLowering)
-        .transformStatement(inlineClassLowering)
+private class NeedsToVisit(private val context: JvmBackendContext) : IrElementVisitorVoid {
+    var result = false
+    private val replacements = context.valueClassLoweringDispatcherSharedData
+    private val visitedParameters = mutableSetOf<IrSymbol>()

-    private fun IrElement.requiresHandling(lowering: JvmValueClassAbstractLowering) =
-        accept(object : IrElementVisitor<Boolean, Nothing?> {
-            override fun visitElement(element: IrElement, data: Nothing?): Boolean = false
-            override fun visitClass(declaration: IrClass, data: Nothing?): Boolean =
-                lowering.needsToVisitClassNew(declaration) || super.visitClass(declaration, data)
+    override fun visitElement(element: IrElement) {
+        if (!result) element.acceptChildrenVoid(this)
+    }

-            override fun visitFunctionReference(expression: IrFunctionReference, data: Nothing?): Boolean =
-                lowering.needsToVisitFunctionReference(expression) || super.visitFunctionReference(expression, data)
+    private fun IrElement.acceptAndGetResult(): Boolean {
+        acceptVoid(this@NeedsToVisit)
+        return result
+    }

-            override fun visitFunctionAccess(expression: IrFunctionAccessExpression, data: Nothing?): Boolean =
-                lowering.needsToVisitFunctionAccess(expression) || super.visitFunctionAccess(expression, data)
+    private val IrClass.needsHandling: Boolean
+        get() = isValue || typeParameters.any { it.acceptAndGetResult() }
+    private val IrType.needsHandling: Boolean
+        get() = classifierOrNull?.isBound == true && erasedUpperBound.needsHandling || this is IrSimpleType && arguments.any { it.typeOrNull?.needsHandling == true }

-            override fun visitCall(expression: IrCall, data: Nothing?): Boolean =
-                lowering.needsToVisitCall(expression) || super.visitCall(expression, data)
+    override fun visitClass(declaration: IrClass) {
+        visitClassHeader(declaration)
+        if (result) return
+        visitClassBody(declaration)
+    }

-            override fun visitStringConcatenation(expression: IrStringConcatenation, data: Nothing?): Boolean =
-                lowering.needsToVisitStringConcatenation(expression) || super.visitStringConcatenation(expression, data)
+    private fun visitClassBody(declaration: IrClass) {
+        if (result) return
+        result = replacements.classResults.getOrPut(Body to declaration) {
+            declaration.declarations.any { it.acceptAndGetResult() }
+        }
+    }

-            override fun visitGetField(expression: IrGetField, data: Nothing?): Boolean =
-                lowering.needsToVisitGetField(expression) || super.visitGetField(expression, data)
+    private fun visitClassHeader(declaration: IrClass) {
+        if (result) return
+        result = replacements.classResults.getOrPut(Header to declaration) {
+            declaration.needsHandling ||
+                    declaration.typeParameters.any { it.acceptAndGetResult() } ||
+                    declaration.superTypes.mapNotNull { (it.classifierOrNull as? IrClassSymbol)?.owner }.any { visitClassHeader(it); result }
+        }
+    }

-            override fun visitSetField(expression: IrSetField, data: Nothing?): Boolean =
-                lowering.needsToVisitSetField(expression) || super.visitSetField(expression, data)
+    override fun visitFunction(declaration: IrFunction) = visitFunction(declaration, withBody = true)

-            override fun visitGetValue(expression: IrGetValue, data: Nothing?): Boolean =
-                lowering.needsToVisitGetValue(expression) || super.visitGetValue(expression, data)
+    private fun visitFunctionHeader(declaration: IrFunction) {
+        if (result) return
+        result = replacements.functionResults.getOrPut(Header to declaration) {
+            declaration.parent.let { it is IrClass && it.needsHandling } ||
+                    declaration.typeParameters.any { it.acceptAndGetResult() } ||
+                    declaration.dispatchReceiverParameter?.acceptAndGetResult() == true ||
+                    declaration.extensionReceiverParameter?.acceptAndGetResult() == true ||
+                    declaration.valueParameters.any { it.acceptAndGetResult() } ||
+                    declaration.returnType.needsHandling ||
+                    (declaration as? IrSimpleFunction)?.overriddenSymbols?.any { visitFunction(it.owner, withBody = false); result } == true
+        }
+    }

-            override fun visitSetValue(expression: IrSetValue, data: Nothing?): Boolean =
-                lowering.needsToVisitSetValue(expression) || super.visitSetValue(expression, data)
+    private fun visitFunction(declaration: IrFunction, withBody: Boolean) {
+        visitFunctionHeader(declaration)
+        if (result) return
+        if(withBody) visitFunctionBody(declaration)
+    }

-            override fun visitVariable(declaration: IrVariable, data: Nothing?): Boolean =
-                lowering.needsToVisitVariable(declaration) || super.visitVariable(declaration, data)
+    private fun visitFunctionBody(declaration: IrFunction) {
+        if (result) return
+        result = replacements.functionResults.getOrPut(Body to declaration) {
+            declaration.body?.acceptAndGetResult() == true
+        }
+    }

-            override fun visitReturn(expression: IrReturn, data: Nothing?): Boolean =
-                lowering.needsToVisitReturn(expression) || super.visitReturn(expression, data)
+    override fun visitValueParameter(declaration: IrValueParameter) {
+        if (result || !visitedParameters.add(declaration.symbol)) return
+        result = declaration.type.needsHandling
+        if (result) return
+        super.visitValueParameter(declaration)
+    }

-            override fun visitContainerExpression(expression: IrContainerExpression, data: Nothing?): Boolean =
-                visitStatementContainer(expression)
+    override fun visitTypeParameter(declaration: IrTypeParameter) {
+        if (result || !visitedParameters.add(declaration.symbol)) return
+        result = declaration.superTypes.any { it.needsHandling }
+        if (result) return
+        super.visitTypeParameter(declaration)
+    }

-            override fun visitBlockBody(body: IrBlockBody, data: Nothing?): Boolean =
-                visitStatementContainer(body)
-
-            private fun visitStatementContainer(expression: IrStatementContainer) = expression.statements.any { it.accept(this, null) }
-        }, null)
-
-    override fun visitFunctionReference(expression: IrFunctionReference): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
+    override fun visitFunctionReference(expression: IrFunctionReference) {
+        if (result) return
+        visitFunction(expression.symbol.owner, withBody = false)
+        if (result) return
        super.visitFunctionReference(expression)
    }

-    override fun visitFunctionAccess(expression: IrFunctionAccessExpression): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
+    override fun visitFunctionAccess(expression: IrFunctionAccessExpression) {
+        if (result) return
+        visitFunction(expression.symbol.owner, withBody = false)
+        if (result) return
        super.visitFunctionAccess(expression)
    }

-    override fun visitCall(expression: IrCall): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
-        super.visitCall(expression)
+    override fun visitField(declaration: IrField) = visitField(declaration, withBody = true)
+
+    private fun visitFieldHeader(declaration: IrField) {
+        if (result) return
+        result = replacements.fieldResults.getOrPut(Header to declaration) {
+            declaration.type.needsHandling
+        }
    }

-    override fun visitStringConcatenation(expression: IrStringConcatenation): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
-        super.visitStringConcatenation(expression)
+    private fun visitFieldBody(declaration: IrField) {
+        if (result) return
+        result = replacements.fieldResults.getOrPut(Body to declaration) {
+            super.visitField(declaration)
+            result
+        }
    }

-    override fun visitGetField(expression: IrGetField): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
-        super.visitGetField(expression)
+    private fun visitField(declaration: IrField, withBody: Boolean) {
+        visitFieldHeader(declaration)
+        if (withBody) visitFieldBody(declaration)
    }

-    override fun visitSetField(expression: IrSetField): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
-        super.visitSetField(expression)
+    override fun visitFieldAccess(expression: IrFieldAccessExpression) {
+        if (result) return
+        visitField(expression.symbol.owner, withBody = false)
+        if (result) return
+        super.visitFieldAccess(expression)
    }

-    override fun visitGetValue(expression: IrGetValue): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
-        super.visitGetValue(expression)
-    }
-
-    override fun visitSetValue(expression: IrSetValue): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
-        super.visitSetValue(expression)
-    }
-
-    override fun visitVariable(declaration: IrVariable): IrStatement = if (declaration.requiresAnyHandling()) {
-        transformStatementConsequently(declaration)
-    } else {
+    override fun visitVariable(declaration: IrVariable) {
+        if (result) return
+        result = declaration.type.needsHandling
+        if (result) return
        super.visitVariable(declaration)
    }

-    override fun visitReturn(expression: IrReturn): IrExpression = if (expression.requiresAnyHandling()) {
-        transformExpressionConsequently(expression)
-    } else {
-        super.visitReturn(expression)
+
+    override fun visitStringConcatenation(expression: IrStringConcatenation) {
+        if (result) return
+        result = expression.arguments.any { it.type.needsHandling }
+        if (result) return
+        super.visitStringConcatenation(expression)
    }

-    override fun visitAnonymousInitializerNew(declaration: IrAnonymousInitializer): IrStatement = if (declaration.requiresAnyHandling()) {
-        transformStatementConsequently(declaration)
-    } else {
-        super.visitAnonymousInitializerNew(declaration)
+    override fun visitCall(expression: IrCall) {
+        if (result) return
+        if (expression.symbol == context.irBuiltIns.eqeqSymbol) {
+            for (it in 0 until expression.valueArgumentsCount) {
+                result = expression.getValueArgument(it)?.type?.needsHandling ?: false
+                if (result) return
+            }
+        }
+        super.visitCall(expression)
    }

-    private fun visitStatementContainer(container: IrStatementContainer) = if (container.statements.any { it.requiresAnyHandling() }) {
-        multiFieldValueClassLowering.visitStatementContainer(container)
-        inlineClassLowering.visitStatementContainer(container)
-    } else {
-        container.statements.replaceAll { it.transformStatement(this) }
+    override fun visitExpression(expression: IrExpression) {
+        if (result) return
+        result = expression.type.needsHandling
+        if (result) return
+        super.visitExpression(expression)
    }
-
-    override fun visitContainerExpression(expression: IrContainerExpression): IrExpression {
-        visitStatementContainer(expression)
-        return expression
-    }
-
-    override fun visitBlockBody(body: IrBlockBody): IrBody {
-        visitStatementContainer(body)
-        return body
-    }
-}
+}
@@ -167,8 +167,9 @@ class JvmBackendContext(

    val inlineClassReplacements = MemoizedInlineClassReplacements(state.functionsWithInlineClassReturnTypesMangled, irFactory, this)

-    val multiFieldValueClassReplacements =
-        MemoizedMultiFieldValueClassReplacements(irFactory, this)
+    val multiFieldValueClassReplacements = MemoizedMultiFieldValueClassReplacements(irFactory, this)
+
+    val valueClassLoweringDispatcherSharedData = MemoizedValueClassLoweringDispatcherSharedData()

    val continuationClassesVarsCountByType: MutableMap<IrAttributeContainer, Map<Type, Int>> = hashMapOf()

@@ -13,8 +13,11 @@ import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.builders.declarations.addValueParameter
 import org.jetbrains.kotlin.ir.builders.declarations.buildFun
 import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.impl.IrSimpleTypeImpl
 import org.jetbrains.kotlin.ir.types.impl.IrStarProjectionImpl
+import org.jetbrains.kotlin.ir.types.isNothing
+import org.jetbrains.kotlin.ir.types.makeNotNull
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.InlineClassDescriptorResolver
@@ -83,13 +86,6 @@ class MemoizedInlineClassReplacements(
            }
        }

-    override fun quickCheckIfFunctionIsNotApplicable(function: IrFunction) = !(
-            function.parent.let { (it is IrClass && it.isSingleFieldValueClass) } ||
-                    function.dispatchReceiverParameter?.type?.isInlineClassType() == true ||
-                    function.extensionReceiverParameter?.type?.isInlineClassType() == true ||
-                    function.valueParameters.any { it.type.isInlineClassType() } || function.returnType.isInlineClassType()
-            )
-
    /**
     * Get the box function for an inline class. Concretely, this is a synthetic
     * static function named "box-impl" which takes an unboxed value and returns
@@ -22,10 +22,7 @@ import org.jetbrains.kotlin.ir.expressions.IrComposite
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.IrStatementOriginImpl
 import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
-import org.jetbrains.kotlin.ir.types.IrSimpleType
-import org.jetbrains.kotlin.ir.types.IrType
-import org.jetbrains.kotlin.ir.types.defaultType
-import org.jetbrains.kotlin.ir.types.isNothing
+import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.InlineClassDescriptorResolver
@@ -290,13 +287,6 @@ class MemoizedMultiFieldValueClassReplacements(
            }
        }

-    override fun quickCheckIfFunctionIsNotApplicable(function: IrFunction): Boolean = !(
-            function.parent.let { it is IrClass && it.isMultiFieldValueClass } ||
-                    function.dispatchReceiverParameter?.type?.needsMfvcFlattening() == true ||
-                    function.extensionReceiverParameter?.type?.needsMfvcFlattening() == true ||
-                    function.valueParameters.any { it.type.needsMfvcFlattening() }
-            )
-
    private val getReplacementForRegularClassConstructorImpl: (IrConstructor) -> IrConstructor? =
        storageManager.createMemoizedFunctionWithNullableValues { constructor ->
            when {
@@ -29,8 +29,7 @@ abstract class MemoizedValueClassAbstractReplacements(
    /**
     * Get a replacement for a function or a constructor.
     */
-    fun getReplacementFunction(function: IrFunction) =
-        if (quickCheckIfFunctionIsNotApplicable(function)) null else getReplacementFunctionImpl(function)
+    fun getReplacementFunction(function: IrFunction) = getReplacementFunctionImpl(function)

    protected abstract val getReplacementFunctionImpl: (IrFunction) -> IrSimpleFunction?

@@ -138,6 +137,4 @@ abstract class MemoizedValueClassAbstractReplacements(
        getReplacementFunction(function) ?: function.also {
            function.overriddenSymbols = replaceOverriddenSymbols(function)
        }
-
-    abstract fun quickCheckIfFunctionIsNotApplicable(function: IrFunction): Boolean
 }
@@ -0,0 +1,20 @@
+/*
+ * 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.backend.jvm
+
+import org.jetbrains.kotlin.ir.declarations.IrClass
+import org.jetbrains.kotlin.ir.declarations.IrField
+import org.jetbrains.kotlin.ir.declarations.IrFunction
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.ConcurrentMap
+
+class MemoizedValueClassLoweringDispatcherSharedData {
+    enum class Access { Header, Body }
+
+    val functionResults: ConcurrentMap<Pair<Access, IrFunction>, Boolean> = ConcurrentHashMap()
+    val classResults: ConcurrentMap<Pair<Access, IrClass>, Boolean> = ConcurrentHashMap()
+    val fieldResults: ConcurrentMap<Pair<Access, IrField>, Boolean> = ConcurrentHashMap()
+}
@@ -0,0 +1,35 @@
+// WITH_STDLIB
+// TARGET_BACKEND: JVM_IR
+// LANGUAGE: +ValueClasses
+// CHECK_BYTECODE_LISTING
+// FIR_IDENTICAL
+
+@JvmInline
+value class Point(val x: Double, val y: Double)
+
+
+class A {
+    fun b(p: Point) {
+        res = p
+    }
+}
+
+var res: Any? = null
+
+
+fun toA(out: A): A {
+
+    fun g(p: List<Point>) {
+        out.b(p.first())
+    }
+
+    g(listOf(Point(1.0, 2.0)))
+    return out
+}
+
+fun box(): String {
+    val a = A()
+    toA(a)
+    require(res.toString() == Point(1.0, 2.0).toString())
+    return "OK"
+}
@@ -0,0 +1,40 @@
+@kotlin.Metadata
+public final class A {
+    // source: 'nestedLoweringStart.kt'
+    public method <init>(): void
+    public final method b-1Nq-99U(p0: double, p1: double): void
+}
+
+@kotlin.Metadata
+public final class NestedLoweringStartKt {
+    // source: 'nestedLoweringStart.kt'
+    private static @org.jetbrains.annotations.Nullable field res: java.lang.Object
+    static method <clinit>(): void
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+    public final static @org.jetbrains.annotations.Nullable method getRes(): java.lang.Object
+    public final static method setRes(@org.jetbrains.annotations.Nullable p0: java.lang.Object): void
+    private final static method toA$g(p0: A, p1: java.util.List): void
+    public final static @org.jetbrains.annotations.NotNull method toA(@org.jetbrains.annotations.NotNull p0: A): A
+}
+
+@kotlin.jvm.JvmInline
+@kotlin.Metadata
+public final class Point {
+    // source: 'nestedLoweringStart.kt'
+    private final field x: double
+    private final field y: double
+    private synthetic method <init>(p0: double, p1: double): void
+    public synthetic final static method box-impl(p0: double, p1: double): Point
+    public final static method constructor-impl(p0: double, p1: double): void
+    public method equals(@org.jetbrains.annotations.Nullable p0: java.lang.Object): boolean
+    public static method equals-impl(p0: double, p1: double, p2: java.lang.Object): boolean
+    public final static method equals-impl0(p0: double, p1: double, p2: double, p3: double): boolean
+    public final method getX(): double
+    public final method getY(): double
+    public method hashCode(): int
+    public static method hashCode-impl(p0: double, p1: double): int
+    public @org.jetbrains.annotations.NotNull method toString(): java.lang.String
+    public static method toString-impl(p0: double, p1: double): java.lang.String
+    public synthetic final method unbox-impl-x(): double
+    public synthetic final method unbox-impl-y(): double
+}
@@ -52149,6 +52149,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
            runTest("compiler/testData/codegen/box/valueClasses/mutableSharedMfvcVar.kt");
        }

+        @Test
+        @TestMetadata("nestedLoweringStart.kt")
+        public void testNestedLoweringStart() throws Exception {
+            runTest("compiler/testData/codegen/box/valueClasses/nestedLoweringStart.kt");
+        }
+
        @Test
        @TestMetadata("nothingAsParameterType.kt")
        public void testNothingAsParameterType() throws Exception {
@@ -52149,6 +52149,12 @@ public class IrBlackBoxCodegenWithIrInlinerTestGenerated extends AbstractIrBlack
            runTest("compiler/testData/codegen/box/valueClasses/mutableSharedMfvcVar.kt");
        }

+        @Test
+        @TestMetadata("nestedLoweringStart.kt")
+        public void testNestedLoweringStart() throws Exception {
+            runTest("compiler/testData/codegen/box/valueClasses/nestedLoweringStart.kt");
+        }
+
        @Test
        @TestMetadata("nothingAsParameterType.kt")
        public void testNothingAsParameterType() throws Exception {