IR: add BackendContext.typeSystem and JvmIrTypeSystemContext

To be able to override JVM-specific behavior of IrTypeSystemContext in
JVM IR, for things like JVM flexible types.

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

@@ -19,15 +19,16 @@ package org.jetbrains.kotlin.backend.common
 import org.jetbrains.kotlin.backend.common.ir.Ir
 import org.jetbrains.kotlin.backend.common.ir.SharedVariablesManager
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrFactory
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
 import org.jetbrains.kotlin.name.FqName
 
 interface BackendContext {
     val ir: Ir<CommonBackendContext>
     val builtIns: KotlinBuiltIns
     val irBuiltIns: IrBuiltIns
+    val typeSystem: IrTypeSystemContext
     val sharedVariablesManager: SharedVariablesManager
     val internalPackageFqn: FqName
     val irFactory: IrFactory

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

@@ -479,8 +479,8 @@ private class FakeOverrideBuilderForLowerings : FakeOverrideBuilderStrategy() {
     }
 }
 
-fun IrClass.addFakeOverrides(irBuiltIns: IrBuiltIns, implementedMembers: List<IrOverridableMember> = emptyList()) {
-    IrOverridingUtil(irBuiltIns, FakeOverrideBuilderForLowerings())
+fun IrClass.addFakeOverrides(typeSystem: IrTypeSystemContext, implementedMembers: List<IrOverridableMember> = emptyList()) {
+    IrOverridingUtil(typeSystem, FakeOverrideBuilderForLowerings())
         .buildFakeOverridesForClassUsingOverriddenSymbols(this, implementedMembers, compatibilityMode = false)
         .forEach { addChild(it) }
 }

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

@@ -407,7 +407,7 @@ abstract class AbstractSuspendFunctionsLowering<C : CommonBackendContext>(val co
             }
 
             coroutineClass.superTypes += superTypes
-            coroutineClass.addFakeOverrides(context.irBuiltIns)
+            coroutineClass.addFakeOverrides(context.typeSystem)
 
             initializeStateMachine(coroutineConstructors, coroutineClassThis)
 

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

@@ -13,9 +13,9 @@ import org.jetbrains.kotlin.backend.common.ir.addFakeOverrides
 import org.jetbrains.kotlin.backend.common.ir.copyTo
 import org.jetbrains.kotlin.backend.common.ir.createImplicitParameterDeclarationWithWrappedDescriptor
 import org.jetbrains.kotlin.descriptors.ClassKind
-import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
 import org.jetbrains.kotlin.descriptors.DescriptorVisibility
+import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.builders.*
@@ -32,7 +32,6 @@ import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.util.OperatorNameConventions
-import org.jetbrains.kotlin.ir.util.functions
 
 abstract class SingleAbstractMethodLowering(val context: CommonBackendContext) : FileLoweringPass, IrElementTransformerVoidWithContext() {
     // SAM wrappers are cached, either in the file class (if it exists), or in a top-level enclosing class.
@@ -234,7 +233,7 @@ abstract class SingleAbstractMethodLowering(val context: CommonBackendContext) :
         if (superType.needEqualsHashCodeMethods)
             generateEqualsHashCode(subclass, superType, field)
 
-        subclass.addFakeOverrides(context.irBuiltIns)
+        subclass.addFakeOverrides(context.typeSystem)
 
         return subclass
     }

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

@@ -12,7 +12,10 @@ import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
 import org.jetbrains.kotlin.backend.common.phaser.makeIrFilePhase
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
-import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.declarations.IrDeclaration
+import org.jetbrains.kotlin.ir.declarations.IrDeclarationOrigin
+import org.jetbrains.kotlin.ir.declarations.IrSymbolOwner
+import org.jetbrains.kotlin.ir.declarations.IrVariable
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.expressions.impl.IrCompositeImpl
 import org.jetbrains.kotlin.ir.util.dump
@@ -236,7 +239,7 @@ private class RangeLoopTransformer(
                 mainLoopVariable.endOffset,
                 context.irBuiltIns.unitType,
                 IrStatementOrigin.FOR_LOOP_NEXT,
-                loopHeader.initializeIteration(mainLoopVariable, loopVariableComponents, this)
+                loopHeader.initializeIteration(mainLoopVariable, loopVariableComponents, this, this@RangeLoopTransformer.context)
             )
         }
 

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

@@ -48,7 +48,8 @@ internal interface ForLoopHeader {
     fun initializeIteration(
         loopVariable: IrVariable?,
         loopVariableComponents: Map<Int, IrVariable>,
-        builder: DeclarationIrBuilder
+        builder: DeclarationIrBuilder,
+        backendContext: CommonBackendContext,
     ): List<IrStatement>
 
     /** Builds a new loop from the old loop. */
@@ -273,8 +274,9 @@ internal class ProgressionLoopHeader(
     override fun initializeIteration(
         loopVariable: IrVariable?,
         loopVariableComponents: Map<Int, IrVariable>,
-        builder: DeclarationIrBuilder
-    ) =
+        builder: DeclarationIrBuilder,
+        backendContext: CommonBackendContext,
+    ): List<IrStatement> =
         with(builder) {
             // loopVariable is used in the loop condition if it can overflow. If no loopVariable was provided, create one.
             this@ProgressionLoopHeader.loopVariable = if (headerInfo.canOverflow && loopVariable == null) {
@@ -377,8 +379,9 @@ internal class IndexedGetLoopHeader(
     override fun initializeIteration(
         loopVariable: IrVariable?,
         loopVariableComponents: Map<Int, IrVariable>,
-        builder: DeclarationIrBuilder
-    ) =
+        builder: DeclarationIrBuilder,
+        backendContext: CommonBackendContext,
+    ): List<IrStatement> =
         with(builder) {
             // loopVariable = objectVariable[inductionVariable]
             val indexedGetFun = with(headerInfo.expressionHandler) { headerInfo.objectVariable.type.getFunction }
@@ -483,8 +486,9 @@ internal class WithIndexLoopHeader(
     override fun initializeIteration(
         loopVariable: IrVariable?,
         loopVariableComponents: Map<Int, IrVariable>,
-        builder: DeclarationIrBuilder
-    ) =
+        builder: DeclarationIrBuilder,
+        backendContext: CommonBackendContext,
+    ): List<IrStatement> =
         with(builder) {
             // The `withIndex()` extension function returns a lazy Iterable that wraps each element of the underlying iterable (e.g., array,
             // progression, Iterable, Sequence, CharSequence) into an IndexedValue containing the index of that element and the element
@@ -553,7 +557,7 @@ internal class WithIndexLoopHeader(
             // We "wire" the 1st destructured component to index, and the 2nd to the loop variable value from the underlying iterable.
             loopVariableComponents[1]?.initializer = irGet(indexVariable)
             listOfNotNull(loopVariableComponents[1], incrementIndexStatement) +
-                    nestedLoopHeader.initializeIteration(loopVariableComponents[2], linkedMapOf(), builder)
+                    nestedLoopHeader.initializeIteration(loopVariableComponents[2], linkedMapOf(), builder, backendContext)
         }
 
     // Use the nested loop header to build the loop. More info in comments in initializeIteration().
@@ -571,7 +575,8 @@ internal class IterableLoopHeader(
     override fun initializeIteration(
         loopVariable: IrVariable?,
         loopVariableComponents: Map<Int, IrVariable>,
-        builder: DeclarationIrBuilder
+        builder: DeclarationIrBuilder,
+        backendContext: CommonBackendContext,
     ): List<IrStatement> =
         with(builder) {
             // loopVariable = iteratorVar.next()
@@ -586,7 +591,7 @@ internal class IterableLoopHeader(
             // Find and replace the call to preserve any type-casts.
             loopVariable?.initializer = loopVariable?.initializer?.transform(InitializerCallReplacer(next), null)
             // Even if there is no loop variable, we always want to call `next()` for iterables and sequences.
-            listOf(loopVariable ?: next.coerceToUnitIfNeeded(next.type, context.irBuiltIns))
+            listOf(loopVariable ?: next.coerceToUnitIfNeeded(next.type, context.irBuiltIns, backendContext.typeSystem))
         }
 
     override fun buildLoop(builder: DeclarationIrBuilder, oldLoop: IrLoop, newBody: IrExpression?): LoopReplacement = with(builder) {

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsIrBackendContext.kt

@@ -10,27 +10,40 @@ import org.jetbrains.kotlin.backend.common.ir.Ir
 import org.jetbrains.kotlin.backend.common.ir.Symbols
 import org.jetbrains.kotlin.builtins.PrimitiveType
 import org.jetbrains.kotlin.config.CompilerConfiguration
-import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
 import org.jetbrains.kotlin.descriptors.impl.EmptyPackageFragmentDescriptor
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
-import org.jetbrains.kotlin.ir.*
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.IrFileEntry
+import org.jetbrains.kotlin.ir.SourceRangeInfo
+import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.backend.js.ir.JsIrBuilder
 import org.jetbrains.kotlin.ir.backend.js.lower.JsInnerClassesSupport
-import org.jetbrains.kotlin.ir.backend.js.utils.*
+import org.jetbrains.kotlin.ir.backend.js.utils.JsInlineClassesUtils
+import org.jetbrains.kotlin.ir.backend.js.utils.OperatorNames
 import org.jetbrains.kotlin.ir.builders.declarations.addFunction
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFileImpl
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.expressions.IrCall
-import org.jetbrains.kotlin.ir.symbols.*
+import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
+import org.jetbrains.kotlin.ir.symbols.IrClassifierSymbol
+import org.jetbrains.kotlin.ir.symbols.IrFileSymbol
+import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.impl.DescriptorlessExternalPackageFragmentSymbol
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.types.impl.IrDynamicTypeImpl
-import org.jetbrains.kotlin.ir.util.*
-import org.jetbrains.kotlin.js.config.RuntimeDiagnostic
+import org.jetbrains.kotlin.ir.util.SymbolTable
+import org.jetbrains.kotlin.ir.util.getPropertyGetter
+import org.jetbrains.kotlin.ir.util.getPropertySetter
+import org.jetbrains.kotlin.ir.util.kotlinPackageFqn
 import org.jetbrains.kotlin.js.config.ErrorTolerancePolicy
 import org.jetbrains.kotlin.js.config.JSConfigurationKeys
+import org.jetbrains.kotlin.js.config.RuntimeDiagnostic
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.scopes.MemberScope
@@ -58,6 +71,7 @@ class JsIrBackendContext(
     val extractedLocalClasses: MutableSet<IrClass> = hashSetOf()
 
     override val builtIns = module.builtIns
+    override val typeSystem: IrTypeSystemContext = IrTypeSystemContextImpl(irBuiltIns)
 
     override val irFactory: IrFactory = symbolTable.irFactory
 
@@ -394,4 +408,4 @@ class JsIrBackendContext(
 
     // TODO: investigate if it could be removed
     fun <T> lazy2(fn: () -> T) = lazy { irFactory.stageController.withInitialIr(fn) }
-}
+}

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/coroutines/AbstractSuspendFunctionsLowering.kt

@@ -8,8 +8,8 @@ package org.jetbrains.kotlin.ir.backend.js.lower.coroutines
 import org.jetbrains.kotlin.backend.common.*
 import org.jetbrains.kotlin.backend.common.ir.*
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
-import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
+import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.backend.js.lower.CallableReferenceLowering
 import org.jetbrains.kotlin.ir.builders.*
@@ -437,7 +437,7 @@ abstract class AbstractSuspendFunctionsLowering<C : CommonBackendContext>(val co
                 coroutineClass.superTypes += coroutineBaseClass.defaultType
             }
 
-            coroutineClass.addFakeOverrides(context.irBuiltIns, implementedMembers)
+            coroutineClass.addFakeOverrides(context.typeSystem, implementedMembers)
 
             // TODO constructing fake overrides on lowered declaration is tricky.
             coroutineClass.declarations.transformFlat {

compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmIrCodegenFactory.kt

@@ -91,7 +91,7 @@ open class JvmIrCodegenFactory(
         val irLinker = JvmIrLinker(
             psi2irContext.moduleDescriptor,
             messageLogger,
-            psi2irContext.irBuiltIns,
+            JvmIrTypeSystemContext(psi2irContext.irBuiltIns),
             symbolTable,
             functionFactory,
             frontEndContext,

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

@@ -35,6 +35,7 @@ import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.IrFunctionReference
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.types.IrType
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
 import org.jetbrains.kotlin.ir.types.defaultType
 import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.name.FqName
@@ -62,6 +63,7 @@ class JvmBackendContext(
     override val scriptMode: Boolean = false
 
     override val builtIns = state.module.builtIns
+    override val typeSystem: IrTypeSystemContext = JvmIrTypeSystemContext(irBuiltIns)
     val typeMapper = IrTypeMapper(this)
     val methodSignatureMapper = MethodSignatureMapper(this)
 

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

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2021 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.descriptors.IrBuiltIns
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
+
+class JvmIrTypeSystemContext(override val irBuiltIns: IrBuiltIns) : IrTypeSystemContext

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt

@@ -1443,7 +1443,7 @@ class ExpressionCodegen(
         val reifiedTypeInliner = ReifiedTypeInliner(
             mappings,
             IrInlineIntrinsicsSupport(context, typeMapper),
-            IrTypeSystemContextImpl(context.irBuiltIns),
+            context.typeSystem,
             state.languageVersionSettings,
             state.unifiedNullChecks,
         )

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/IrTypeMapper.kt

@@ -40,7 +40,7 @@ import org.jetbrains.kotlin.ir.types.isKClass as isKClassImpl
 import org.jetbrains.kotlin.ir.util.isSuspendFunction as isSuspendFunctionImpl
 
 class IrTypeMapper(private val context: JvmBackendContext) : KotlinTypeMapperBase(), TypeMappingContext<JvmSignatureWriter> {
-    override val typeSystem: IrTypeSystemContext = IrTypeSystemContextImpl(context.irBuiltIns)
+    override val typeSystem: IrTypeSystemContext = context.typeSystem
     override val typeContext: TypeSystemCommonBackendContextForTypeMapping = IrTypeCheckerContextForTypeMapping(typeSystem, context)
 
     override fun mapClass(classifier: ClassifierDescriptor): Type =

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

@@ -219,10 +219,8 @@ fun IrDeclaration.isInCurrentModule(): Boolean =
 // "not learned through smartcasting".
 fun IrExpression.isSmartcastFromHigherThanNullable(context: JvmBackendContext): Boolean {
     return when (this) {
-        is IrTypeOperatorCall -> operator == IrTypeOperator.IMPLICIT_CAST && !argument.type.isSubtypeOf(
-            type.makeNullable(),
-            context.irBuiltIns
-        )
+        is IrTypeOperatorCall ->
+            operator == IrTypeOperator.IMPLICIT_CAST && !argument.type.isSubtypeOf(type.makeNullable(), context.typeSystem)
         is IrGetValue -> {
             // Check if the variable initializer is smartcast. In FIR, if the subject of a `when` is smartcast,
             // the IMPLICIT_CAST is in the initializer of the variable for the subject.

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

@@ -231,7 +231,7 @@ internal class CollectionStubMethodLowering(val context: JvmBackendContext) : Cl
     private fun createTypeChecker(overrideFun: IrSimpleFunction, parentFun: IrSimpleFunction): AbstractTypeCheckerContext =
         IrTypeCheckerContext(
             IrTypeSystemContextWithAdditionalAxioms(
-                context.irBuiltIns,
+                context.typeSystem,
                 overrideFun.typeParameters,
                 parentFun.typeParameters
             )

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

@@ -522,7 +522,7 @@ internal class FunctionReferenceLowering(private val context: JvmBackendContext)
                     generateSamEqualsHashCodeMethods(boundReceiverVar)
                 }
                 if (isKotlinFunInterface) {
-                    functionReferenceClass.addFakeOverrides(context.irBuiltIns)
+                    functionReferenceClass.addFakeOverrides(backendContext.typeSystem)
                 }
 
                 +functionReferenceClass
@@ -845,5 +845,3 @@ internal class FunctionReferenceLowering(private val context: JvmBackendContext)
             declaration.parent.let { it is IrClass && it.isFileClass }
     }
 }
-
-

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

@@ -280,7 +280,7 @@ class JvmOptimizationLowering(val context: JvmBackendContext) : FileLoweringPass
                     return context.createIrBuilder(expression.symbol, expression.startOffset, expression.endOffset).irBlock(expression) {
                         if (backingField.isStatic && receiver != null) {
                             // If the field is static, evaluate the receiver for potential side effects.
-                            +receiver.coerceToUnit(context.irBuiltIns)
+                            +receiver.coerceToUnit(context.irBuiltIns, this@JvmOptimizationLowering.context.typeSystem)
                         }
                         if (accessor.valueParameters.size > 0) {
                             +irSetField(

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

@@ -126,7 +126,7 @@ class JvmPropertiesLowering(private val backendContext: JvmBackendContext) : IrE
     private fun IrBuilderWithScope.patchReceiver(expression: IrFieldAccessExpression): IrExpression =
         if (expression.symbol.owner.isStatic && expression.receiver != null) {
             irBlock {
-                +expression.receiver!!.coerceToUnit(context.irBuiltIns)
+                +expression.receiver!!.coerceToUnit(context.irBuiltIns, backendContext.typeSystem)
                 expression.receiver = null
                 +expression
             }

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

@@ -30,7 +30,10 @@ import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
 import org.jetbrains.kotlin.ir.types.*
-import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.util.defaultType
+import org.jetbrains.kotlin.ir.util.dump
+import org.jetbrains.kotlin.ir.util.parentAsClass
+import org.jetbrains.kotlin.ir.util.render
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
@@ -360,7 +363,11 @@ private class TypeOperatorLowering(private val context: JvmBackendContext) : Fil
                 irComposite(resultType = expression.type) {
                     +expression.argument.transformVoid()
                     // TODO: Don't generate these casts in the first place
-                    if (!expression.argument.type.isSubtypeOf(expression.type.makeNullable(), context.irBuiltIns)) {
+                    if (!expression.argument.type.isSubtypeOf(
+                            expression.type.makeNullable(),
+                            this@TypeOperatorLowering.context.typeSystem
+                        )
+                    ) {
                         +IrCompositeImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, expression.type)
                     }
                 }

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmBackendContext.kt

@@ -13,16 +13,24 @@ import org.jetbrains.kotlin.backend.wasm.utils.WasmInlineClassesUtils
 import org.jetbrains.kotlin.config.CompilerConfiguration
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.impl.EmptyPackageFragmentDescriptor
-import org.jetbrains.kotlin.ir.*
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.IrFileEntry
+import org.jetbrains.kotlin.ir.SourceRangeInfo
+import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.backend.js.JsCommonBackendContext
 import org.jetbrains.kotlin.ir.backend.js.JsMapping
 import org.jetbrains.kotlin.ir.backend.js.lower.JsInnerClassesSupport
 import org.jetbrains.kotlin.ir.builders.declarations.buildFun
-import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.declarations.IrFactory
+import org.jetbrains.kotlin.ir.declarations.IrFile
+import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
 import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFileImpl
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.symbols.impl.DescriptorlessExternalPackageFragmentSymbol
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
@@ -36,6 +44,7 @@ class WasmBackendContext(
     override val configuration: CompilerConfiguration,
 ) : JsCommonBackendContext {
     override val builtIns = module.builtIns
+    override val typeSystem: IrTypeSystemContext = IrTypeSystemContextImpl(irBuiltIns)
     override var inVerbosePhase: Boolean = false
     override val scriptMode = false
     override val irFactory: IrFactory = symbolTable.irFactory

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/lower/GenericReturnTypeLowering.kt

@@ -15,7 +15,6 @@ import org.jetbrains.kotlin.ir.backend.js.utils.realOverrideTarget
 import org.jetbrains.kotlin.ir.builders.irImplicitCast
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
-import org.jetbrains.kotlin.ir.declarations.IrTypeParameter
 import org.jetbrains.kotlin.ir.expressions.IrCall
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
@@ -62,7 +61,7 @@ class GenericReturnTypeLowering(val context: WasmBackendContext) : FileLoweringP
 
         if (erasedReturnType != call.type) {
             if (callType.isNothing()) return call
-            if (erasedReturnType.isSubtypeOf(callType, context.irBuiltIns)) return call
+            if (erasedReturnType.isSubtypeOf(callType, context.typeSystem)) return call
 
             // Erase type parameter from call return type
             val newCall = irCall(
@@ -83,4 +82,4 @@ class GenericReturnTypeLowering(val context: WasmBackendContext) : FileLoweringP
         }
         return call
     }
-}
+}

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/lower/WasmTypeOperatorLowering.kt

@@ -17,7 +17,10 @@ import org.jetbrains.kotlin.backend.wasm.ir2wasm.erasedUpperBound
 import org.jetbrains.kotlin.ir.builders.*
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrTypeParameter
-import org.jetbrains.kotlin.ir.expressions.*
+import org.jetbrains.kotlin.ir.expressions.IrConst
+import org.jetbrains.kotlin.ir.expressions.IrExpression
+import org.jetbrains.kotlin.ir.expressions.IrTypeOperator
+import org.jetbrains.kotlin.ir.expressions.IrTypeOperatorCall
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
@@ -94,7 +97,7 @@ class WasmBaseTypeOperatorTransformer(val context: WasmBackendContext) : IrEleme
         // Inlined values have no type information on runtime.
         // But since they are final we can compute type checks on compile time.
         if (fromType.isInlined()) {
-            val result = fromType.erasedType.isSubtypeOf(toType.erasedType, builtIns)
+            val result = fromType.erasedType.isSubtypeOf(toType.erasedType, context.typeSystem)
             return builder.irBoolean(result)
         }
 
@@ -173,7 +176,7 @@ class WasmBaseTypeOperatorTransformer(val context: WasmBackendContext) : IrEleme
             }
         }
 
-        if (fromType.erasedType.isSubtypeOf(toType.erasedType, context.irBuiltIns)) {
+        if (fromType.erasedType.isSubtypeOf(toType.erasedType, context.typeSystem)) {
             return value
         }
         if (toType.isNothing()) {
@@ -213,7 +216,7 @@ class WasmBaseTypeOperatorTransformer(val context: WasmBackendContext) : IrEleme
         val toType = expression.typeOperand
         val fromType = expression.argument.type
 
-        if (fromType.erasedType.isSubtypeOf(expression.type.erasedType, context.irBuiltIns)) {
+        if (fromType.erasedType.isSubtypeOf(expression.type.erasedType, context.typeSystem)) {
             return narrowType(fromType, expression.type, expression.argument)
         }
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/overrides/IrOverridingUtil.kt

@@ -10,7 +10,6 @@ import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
 import org.jetbrains.kotlin.descriptors.DescriptorVisibility
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.collectAndFilterRealOverrides
@@ -98,7 +97,7 @@ fun buildFakeOverrideMember(superType: IrType, member: IrOverridableMember, claz
 // to use abstract overridable member interfaces.
 
 class IrOverridingUtil(
-    private val irBuiltIns: IrBuiltIns,
+    private val typeSystem: IrTypeSystemContext,
     private val fakeOverrideBuilder: FakeOverrideBuilderStrategy
 ) {
     private val originals = mutableMapOf<IrOverridableMember, IrOverridableMember>()
@@ -446,7 +445,7 @@ class IrOverridingUtil(
         AbstractTypeChecker.equalTypes(this as AbstractTypeCheckerContext, a, b)
 
     private fun createTypeChecker(a: List<IrTypeParameter>, b: List<IrTypeParameter>) =
-        IrTypeCheckerContext(IrTypeSystemContextWithAdditionalAxioms(irBuiltIns, a, b))
+        IrTypeCheckerContext(IrTypeSystemContextWithAdditionalAxioms(typeSystem, a, b))
 
     private fun isReturnTypeMoreSpecific(
         a: IrOverridableMember,
@@ -677,7 +676,7 @@ class IrOverridingUtil(
         val typeCheckerContext =
             IrTypeCheckerContext(
                 IrTypeSystemContextWithAdditionalAxioms(
-                    irBuiltIns,
+                    typeSystem,
                     superTypeParameters,
                     subTypeParameters
                 )

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/IrTypeCheckerUtils.kt

@@ -6,14 +6,13 @@
 package org.jetbrains.kotlin.ir.types
 
 import org.jetbrains.kotlin.ir.declarations.IrTypeParameter
-import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.types.model.TypeConstructorMarker
 
 class IrTypeSystemContextWithAdditionalAxioms(
-    override val irBuiltIns: IrBuiltIns,
+    typeSystem: IrTypeSystemContext,
     firstParameters: List<IrTypeParameter>,
     secondParameters: List<IrTypeParameter>
-) : IrTypeSystemContext {
+) : IrTypeSystemContext by typeSystem {
     init {
         assert(firstParameters.size == secondParameters.size) {
             "different length of type parameter lists: $firstParameters vs $secondParameters"
@@ -29,4 +28,4 @@ class IrTypeSystemContextWithAdditionalAxioms(
         if (matchingTypeConstructors[c1] == c2 || matchingTypeConstructors[c2] == c1) return true
         return false
     }
-}
+}

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/IrTypeUtils.kt

@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.ir.symbols.IrClassifierSymbol
 import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
 import org.jetbrains.kotlin.ir.util.fqNameWhenAvailable
 import org.jetbrains.kotlin.types.AbstractTypeChecker
-import org.jetbrains.kotlin.types.AbstractTypeCheckerContext
 
 fun IrClassifierSymbol.superTypes(): List<IrType> = when (this) {
     is IrClassSymbol -> owner.superTypes
@@ -30,13 +29,8 @@ fun IrClassifierSymbol.isStrictSubtypeOfClass(superClass: IrClassSymbol): Boolea
 fun IrType.isSubtypeOfClass(superClass: IrClassSymbol): Boolean =
     this is IrSimpleType && classifier.isSubtypeOfClass(superClass)
 
-fun IrType.isSubtypeOf(superType: IrType, irBuiltIns: IrBuiltIns): Boolean {
-    return AbstractTypeChecker.isSubtypeOf(
-        IrTypeCheckerContext(IrTypeSystemContextImpl(irBuiltIns)) as AbstractTypeCheckerContext,
-        this,
-        superType
-    )
-}
+fun IrType.isSubtypeOf(superType: IrType, typeSystem: IrTypeSystemContext): Boolean =
+    AbstractTypeChecker.isSubtypeOf(IrTypeCheckerContext(typeSystem), this, superType)
 
 fun IrType.isNullable(): Boolean =
     when (this) {

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt

@@ -154,12 +154,12 @@ fun IrExpression.isFalseConst() = this is IrConst<*> && this.kind == IrConstKind
 
 fun IrExpression.isIntegerConst(value: Int) = this is IrConst<*> && this.kind == IrConstKind.Int && this.value == value
 
-fun IrExpression.coerceToUnit(builtins: IrBuiltIns): IrExpression {
-    return coerceToUnitIfNeeded(type, builtins)
+fun IrExpression.coerceToUnit(builtins: IrBuiltIns, typeSystem: IrTypeSystemContext): IrExpression {
+    return coerceToUnitIfNeeded(type, builtins, typeSystem)
 }
 
-fun IrExpression.coerceToUnitIfNeeded(valueType: IrType, irBuiltIns: IrBuiltIns): IrExpression {
-    return if (valueType.isSubtypeOf(irBuiltIns.unitType, irBuiltIns))
+fun IrExpression.coerceToUnitIfNeeded(valueType: IrType, irBuiltIns: IrBuiltIns, typeSystem: IrTypeSystemContext): IrExpression {
+    return if (valueType.isSubtypeOf(irBuiltIns.unitType, typeSystem))
         this
     else
         IrTypeOperatorCallImpl(

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/FakeOverrides.kt

@@ -28,6 +28,7 @@ import org.jetbrains.kotlin.ir.overrides.IrOverridingUtil
 import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.impl.IrPropertySymbolImpl
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
 import org.jetbrains.kotlin.ir.types.getClass
 import org.jetbrains.kotlin.ir.util.IdSignature
 import org.jetbrains.kotlin.ir.util.KotlinMangler
@@ -69,12 +70,12 @@ class FakeOverrideBuilder(
     val linker: FileLocalAwareLinker,
     val symbolTable: SymbolTable,
     mangler: KotlinMangler.IrMangler,
-    irBuiltIns: IrBuiltIns,
+    typeSystem: IrTypeSystemContext,
     val platformSpecificClassFilter: FakeOverrideClassFilter = DefaultFakeOverrideClassFilter
 ) : FakeOverrideBuilderStrategy() {
     private val haveFakeOverrides = mutableSetOf<IrClass>()
 
-    private val irOverridingUtil = IrOverridingUtil(irBuiltIns, this)
+    private val irOverridingUtil = IrOverridingUtil(typeSystem, this)
 
     // TODO: The declaration table is needed for the signaturer.
     private val fakeOverrideDeclarationTable = FakeOverrideDeclarationTable(mangler)

compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsIrLinker.kt

@@ -7,13 +7,12 @@ package org.jetbrains.kotlin.ir.backend.js.lower.serialization.ir
 
 import org.jetbrains.kotlin.backend.common.overrides.FakeOverrideBuilder
 import org.jetbrains.kotlin.backend.common.serialization.*
-import org.jetbrains.kotlin.backend.common.serialization.signature.IdSignatureSerializer
-import org.jetbrains.kotlin.backend.common.serialization.signature.PublicIdSignatureComputer
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.ir.builders.TranslationPluginContext
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.descriptors.IrAbstractFunctionFactory
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.ir.util.IrMessageLogger
 import org.jetbrains.kotlin.ir.util.ReferenceSymbolTable
 import org.jetbrains.kotlin.ir.util.SymbolTable
@@ -30,7 +29,7 @@ class JsIrLinker(
     private val icData: ICData? = null
 ) : KotlinIrLinker(currentModule, messageLogger, builtIns, symbolTable, emptyList()) {
 
-    override val fakeOverrideBuilder = FakeOverrideBuilder(this, symbolTable, JsManglerIr, builtIns)
+    override val fakeOverrideBuilder = FakeOverrideBuilder(this, symbolTable, JsManglerIr, IrTypeSystemContextImpl(builtIns))
 
     override fun isBuiltInModule(moduleDescriptor: ModuleDescriptor): Boolean =
         moduleDescriptor === moduleDescriptor.builtIns.builtInsModule

compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/ir/backend/jvm/serialization/JvmIrLinker.kt

@@ -8,8 +8,6 @@ package org.jetbrains.kotlin.ir.backend.jvm.serialization
 import org.jetbrains.kotlin.backend.common.overrides.FakeOverrideBuilder
 import org.jetbrains.kotlin.backend.common.serialization.*
 import org.jetbrains.kotlin.backend.common.serialization.encodings.BinarySymbolData
-import org.jetbrains.kotlin.backend.common.serialization.signature.IdSignatureSerializer
-import org.jetbrains.kotlin.backend.common.serialization.signature.PublicIdSignatureComputer
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.konan.KlibModuleOrigin
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
@@ -18,9 +16,9 @@ import org.jetbrains.kotlin.ir.declarations.IrField
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.declarations.impl.IrModuleFragmentImpl
 import org.jetbrains.kotlin.ir.descriptors.IrAbstractFunctionFactory
-import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.symbols.IrFieldSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
 import org.jetbrains.kotlin.ir.util.DeclarationStubGenerator
 import org.jetbrains.kotlin.ir.util.IdSignature
 import org.jetbrains.kotlin.ir.util.IrMessageLogger
@@ -37,15 +35,15 @@ import org.jetbrains.kotlin.name.Name
 class JvmIrLinker(
     currentModule: ModuleDescriptor?,
     messageLogger: IrMessageLogger,
-    builtIns: IrBuiltIns,
+    typeSystem: IrTypeSystemContext,
     symbolTable: SymbolTable,
     override val functionalInterfaceFactory: IrAbstractFunctionFactory,
     override val translationPluginContext: TranslationPluginContext?,
     private val stubGenerator: DeclarationStubGenerator,
     private val manglerDesc: JvmManglerDesc
-) : KotlinIrLinker(currentModule, messageLogger, builtIns, symbolTable, emptyList()) {
+) : KotlinIrLinker(currentModule, messageLogger, typeSystem.irBuiltIns, symbolTable, emptyList()) {
 
-    override val fakeOverrideBuilder = FakeOverrideBuilder(this, symbolTable, JvmManglerIr, builtIns)
+    override val fakeOverrideBuilder = FakeOverrideBuilder(this, symbolTable, JvmManglerIr, typeSystem)
 
     private val javaName = Name.identifier("java")
 

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Context.kt

@@ -24,6 +24,8 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrFieldImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFunctionImpl
 import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.builtins.konan.KonanBuiltIns
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
 import org.jetbrains.kotlin.ir.symbols.impl.IrSimpleFunctionSymbolImpl
@@ -330,6 +332,9 @@ internal class Context(config: KonanConfig) : KonanBackendContext(config) {
     override val irBuiltIns
         get() = ir.irModule.irBuiltins
 
+    override val typeSystem: IrTypeSystemContext
+        get() = IrTypeSystemContextImpl(irBuiltIns)
+
     val interopBuiltIns by lazy {
         InteropBuiltIns(this.builtIns)
     }

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/EnumSpecialDescriptorsFactory.kt

@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.backend.konan.descriptors.synthesizedName
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
 import org.jetbrains.kotlin.descriptors.Modality
-import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.declarations.buildFun
 import org.jetbrains.kotlin.ir.builders.irBlockBody
 import org.jetbrains.kotlin.ir.builders.irCall
@@ -32,9 +31,11 @@ import org.jetbrains.kotlin.ir.symbols.impl.IrFieldSymbolImpl
 import org.jetbrains.kotlin.ir.symbols.impl.IrSimpleFunctionSymbolImpl
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.typeWith
-import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.util.constructors
+import org.jetbrains.kotlin.ir.util.defaultType
+import org.jetbrains.kotlin.ir.util.functions
+import org.jetbrains.kotlin.ir.util.module
 import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.resolve.descriptorUtil.module
 
 
 internal object DECLARATION_ORIGIN_ENUM : IrDeclarationOriginImpl("ENUM")
@@ -203,7 +204,7 @@ internal class EnumSpecialDeclarationsFactory(val context: Context) {
         )
 
         implObject.superTypes += context.irBuiltIns.anyType
-        implObject.addFakeOverrides(context.irBuiltIns)
+        implObject.addFakeOverrides(context.typeSystem)
 
         val itemGetterSymbol = findItemGetterSymbol()
         val enumEntriesMap = enumEntriesMap(enumClass)

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGen.kt

@@ -45,6 +45,7 @@ import org.jetbrains.kotlin.util.OperatorNameConventions
 
 internal interface KotlinStubs {
     val irBuiltIns: IrBuiltIns
+    val typeSystem: IrTypeSystemContext
     val symbols: KonanSymbols
     val target: KonanTarget
     val language: String
@@ -1221,7 +1222,7 @@ private class ObjCBlockPointerValuePassing(
             +irReturn(callBlock(blockPointer, arguments))
         }
 
-        irClass.addFakeOverrides(stubs.irBuiltIns)
+        irClass.addFakeOverrides(stubs.typeSystem)
 
         stubs.addKotlin(irClass)
         return constructor

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionReferenceLowering.kt

@@ -294,7 +294,7 @@ internal class FunctionReferenceLowering(val context: Context): FileLoweringPass
 
             functionReferenceClass.superTypes += superTypes
 
-            functionReferenceClass.addFakeOverrides(context.irBuiltIns)
+            functionReferenceClass.addFakeOverrides(context.typeSystem)
 
             return BuiltFunctionReference(functionReferenceClass, buildConstructor())
         }

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt

@@ -80,6 +80,7 @@ private abstract class BaseInteropIrTransformer(private val context: Context) :
         return object : KotlinStubs {
             override val irBuiltIns get() = context.irBuiltIns
             override val symbols get() = context.ir.symbols
+            override val typeSystem: IrTypeSystemContext get() = context.typeSystem
 
             val klib: KonanLibrary? get() {
                 return (element as? IrCall)?.symbol?.owner?.konanLibrary as? KonanLibrary

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/TestProcessor.kt

@@ -518,7 +518,7 @@ internal class TestProcessor (val context: Context) {
             companionGetter?.let { declarations += it }
 
             superTypes += symbols.baseClassSuite.typeWith(listOf(testClassType, testCompanionType))
-            addFakeOverrides(context.irBuiltIns)
+            addFakeOverrides(context.typeSystem)
         }
     //endregion
 

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanIrlinker.kt

@@ -37,6 +37,7 @@ import org.jetbrains.kotlin.ir.descriptors.IrAbstractFunctionFactory
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 import org.jetbrains.kotlin.ir.symbols.impl.IrPublicSymbolBase
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.ir.types.classOrNull
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
@@ -91,7 +92,8 @@ internal class KonanIrLinker(
     override fun isBuiltInModule(moduleDescriptor: ModuleDescriptor): Boolean = moduleDescriptor.isNativeStdlib()
 
     private val forwardDeclarationDeserializer = forwardModuleDescriptor?.let { KonanForwardDeclarationModuleDeserializer(it) }
-    override val fakeOverrideBuilder = FakeOverrideBuilder(this, symbolTable, KonanManglerIr, builtIns, KonanFakeOverrideClassFilter)
+    override val fakeOverrideBuilder: FakeOverrideBuilder =
+        FakeOverrideBuilder(this, symbolTable, KonanManglerIr, IrTypeSystemContextImpl(builtIns), KonanFakeOverrideClassFilter)
 
     override fun createModuleDeserializer(moduleDescriptor: ModuleDescriptor, klib: KotlinLibrary?, strategy: DeserializationStrategy): IrModuleDeserializer {
         if (moduleDescriptor === forwardModuleDescriptor) {