[Fir2Ir] Introduce testing with IrFakeOverrideBuilder

^KT-61514

compiler/testData/codegen/box/annotations/javaAnnotationArrayValueDefault.kt

@@ -1,6 +1,7 @@
 // TARGET_BACKEND: JVM
 // WITH_STDLIB
 // DUMP_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // MODULE: lib
 // FILE: JavaAnn.java
 

compiler/testData/codegen/box/annotations/javaTargetOnPrimaryCtorParameter.kt

@@ -1,5 +1,6 @@
 // WITH_STDLIB
 // WITH_REFLECT
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // TARGET_BACKEND: JVM_IR
 // FIR_DUMP
 // DUMP_IR

compiler/testData/codegen/box/annotations/selfReferentialAnnotation.kt

@@ -1,5 +1,6 @@
 // FIR_DUMP
 // DUMP_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 
 annotation class Ann(@Ann(1) val e: Int)
 

compiler/testData/codegen/box/annotations/targetOnPrimaryCtorParameter.kt

@@ -1,6 +1,7 @@
 // WITH_STDLIB
 // WITH_REFLECT
 // TARGET_BACKEND: JVM_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // FIR_DUMP
 // DUMP_IR
 

compiler/testData/codegen/box/bridges/internalMethodOverrideInFriendModule.kt

@@ -1,4 +1,5 @@
 // IGNORE_BACKEND: WASM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61384
 // WITH_STDLIB
 
 // MODULE: lib1

compiler/testData/codegen/box/bridges/internalMethodOverrideMultipleInheritance.kt

@@ -1,5 +1,6 @@
 // IGNORE_BACKEND: WASM
 // WITH_STDLIB
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61384
 
 // MODULE: lib1
 

compiler/testData/codegen/box/bridges/objectClone.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 import java.util.HashSet
 
 interface A : Set<String>

compiler/testData/codegen/box/builtinStubMethods/mapRemove/noDefaultImpls.kt

@@ -1,5 +1,6 @@
 // !JVM_DEFAULT_MODE: all
 // SKIP_JDK6
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // TARGET_BACKEND: JVM
 // JVM_TARGET: 1.8
 // WITH_STDLIB

compiler/testData/codegen/box/callableReference/serializability/referenceToCompanionFunction.kt

@@ -2,6 +2,7 @@
 // FE 1.0 incorrectly resolves reference `Some::foo` (KT-45315)
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: Wasm box test does not support disabling only K1 mode with IGNORE_BACKEND directive
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // ISSUE: KT-55909
 // DUMP_IR
 

compiler/testData/codegen/box/classes/inheritSetAndHashSet.kt

@@ -1,6 +1,7 @@
 // IGNORE_BACKEND: WASM
 // WASM_MUTE_REASON: STDLIB_COLLECTION_INHERITANCE
 // KJS_WITH_FULL_RUNTIME
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // DONT_TARGET_EXACT_BACKEND: NATIVE
 
 interface A : Set<String>

compiler/testData/codegen/box/collections/inheritFromAbstractMutableListInt.kt

@@ -1,4 +1,5 @@
 // WITH_STDLIB
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 
 abstract class A : AbstractMutableList<Int>()
 

compiler/testData/codegen/box/collections/irrelevantImplCharSequence.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 
 // FILE: J.java
 

compiler/testData/codegen/box/collections/noStubsInJavaSuperClass.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 
 // FILE: B.java
 public abstract class B<E> extends A<E> implements L<E> {

compiler/testData/codegen/box/collections/removeAtBridgeClashWithJava.kt

@@ -1,5 +1,6 @@
 // TARGET_BACKEND: JVM
 // WITH_STDLIB
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // FILE: removeAtBridgeClashWithJava.kt
 
 abstract class AJALI : JavaAbstractList<Int>()

compiler/testData/codegen/box/collections/specialBridgeForGet.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // WITH_STDLIB
 // FULL_JDK
 

compiler/testData/codegen/box/compileKotlinAgainstKotlin/jvmField.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61384
 // WITH_STDLIB
 
 // MODULE: lib

compiler/testData/codegen/box/compileKotlinAgainstKotlin/jvmFieldInConstructor.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61384
 // WITH_STDLIB
 
 // MODULE: lib

compiler/testData/codegen/box/delegation/delegationToIntersectionType.kt

@@ -1,4 +1,5 @@
 // DUMP_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 
 fun <T> select(a: T, b: T) : T = a
 

compiler/testData/codegen/box/delegation/delegationToIntersectionType2.kt

@@ -1,6 +1,7 @@
 // TARGET_BACKEND: JVM
 // IGNORE_BACKEND_K1: ANY
 // DUMP_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // K1_STATUS: java.lang.AssertionError: There is still an unbound symbol after generation of IR module <main>
 
 fun <T> select(a: T, b: T) : T = a

compiler/testData/codegen/box/differentDependencyVersion/kt51194_java.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // ISSUE: KT-51194
 
 // MODULE: coreLib_1

compiler/testData/codegen/box/fakeOverride/internalFromFriendModule.kt

@@ -1,4 +1,5 @@
 // IGNORE_BACKEND: WASM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61384
 
 // MODULE: lib
 // FILE: l.kt

compiler/testData/codegen/box/fir/CustomHashSetSize.kt

@@ -1,5 +1,6 @@
 // TARGET_BACKEND: JVM_IR
 // WITH_STDLIB
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 
 // MODULE: m1
 // FILE: m1/THash.java

compiler/testData/codegen/box/fir/callableReferenceToJavaField.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // DUMP_IR
 // FULL_JDK
 // WITH_REFLECT

compiler/testData/codegen/box/fir/syntheticPropertyThroughJava.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // ISSUE: KT-59550
 
 // FILE: Intermediate.java

compiler/testData/codegen/box/fir/syntheticPropertyThroughJavaMultiModule.kt

@@ -1,5 +1,6 @@
 // TARGET_BACKEND: JVM_IR
 // ISSUE: KT-59550 (related)
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 
 // MODULE: m1
 // FILE: Base.kt

compiler/testData/codegen/box/fir/syntheticPropertyThroughJavaWithSetter.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // ISSUE: KT-59550
 
 // FILE: Intermediate.java

compiler/testData/codegen/box/functions/delegatedPropertyWithMultipleOverriddens_generics.kt

@@ -1,5 +1,7 @@
 // ISSUE: KT-55828
 // DUMP_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
+
 interface MyCollection<out E1> {
     fun foo(): E1
     val bar: E1

compiler/testData/codegen/box/functions/delegatedPropertyWithMultipleOverriddens_noGenerics.kt

@@ -1,5 +1,7 @@
 // ISSUE: KT-55828
 // DUMP_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
+
 interface MyCollection {
     fun foo(): String
     val bar: String

compiler/testData/codegen/box/inlineArgsInPlace/arrayDequeRemoveAll.kt

@@ -1,4 +1,5 @@
 // WITH_STDLIB
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 
 @Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
 class ArrayDeque<E> : AbstractMutableList<E> {

compiler/testData/codegen/box/ir/kt41765.kt

@@ -1,4 +1,5 @@
 // MODULE: lib
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61543
 // FILE: lib.kt
 
 // KT-41765

compiler/testData/codegen/box/javaFieldAndKotlinProperty/javaFieldAndKotlinProperty.kt

@@ -1,5 +1,6 @@
 // TARGET_BACKEND: JVM_IR
 // IGNORE_BACKEND_K1: JVM_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // Field VS property: case 4.1
 // See KT-50082
 // DUMP_IR

compiler/testData/codegen/box/javaInterop/conflictingOverloadsForThrowableInheritors.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // FULL_JDK
 // ISSUE: KT-45584
 

compiler/testData/codegen/box/javaInterop/conflictingOverloadsForThrowableInheritors2.kt

@@ -1,5 +1,6 @@
 // TARGET_BACKEND: JVM
 // FULL_JDK
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // ISSUE: KT-45584
 
 // FILE: PlaceholderExceptionSupport.java

compiler/testData/codegen/box/javaInterop/syntheticPropClashingWithJvmField.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // WITH_STDLIB
 // ISSUE: KT-56538
 

compiler/testData/codegen/box/javaVisibility/package/cannotAccessInterfaceMemberViaReceiver.kt

@@ -1,5 +1,6 @@
 // TARGET_BACKEND: JVM_IR
 // DUMP_IR
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // FILE: javapackage/PackagePrivateGrandparentInterface.java
 
 package javapackage;

compiler/testData/codegen/box/jdk/removeIf.kt

@@ -1,5 +1,6 @@
 // SKIP_JDK6
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // FULL_JDK
 // WITH_STDLIB
 

compiler/testData/codegen/box/jvm8/defaults/allCompatibility/bridgeWithJava.kt

@@ -1,5 +1,6 @@
 // !JVM_DEFAULT_MODE: all-compatibility
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // JVM_TARGET: 1.8
 // WITH_STDLIB
 // FULL_JDK

compiler/testData/codegen/box/jvm8/defaults/noDefaultImpls/bridgeWithJava.kt

@@ -1,5 +1,6 @@
 // !JVM_DEFAULT_MODE: all
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // JVM_TARGET: 1.8
 // WITH_STDLIB
 // FULL_JDK

compiler/testData/codegen/box/jvm8/treeMapBridge.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 
 // java.lang.NoSuchMethodError: java.util.TreeMap.remove
 // IGNORE_BACKEND: ANDROID

compiler/testData/codegen/box/sam/partialSam.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // WITH_STDLIB
 // FILE: Fn.java
 public interface Fn<T, R> {

compiler/testData/codegen/box/sam/partialSamKT.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // WITH_STDLIB
 // FILE: Fn.java
 public interface Fn<T, R> {

compiler/testData/codegen/box/smartCasts/kt44814.kt

@@ -2,6 +2,7 @@
 // WITH_STDLIB
 // DUMP_IR
 // DUMP_CFG
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // RENDERER_CFG_LEVELS
 
 class FlyweightCapableTreeStructure

compiler/testData/codegen/box/specialBuiltins/complexMapImpl.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // WITH_STDLIB
 
 // binary representation of fractional part of phi = (sqrt(5) - 1) / 2

compiler/testData/codegen/box/specialBuiltins/specialBridgeModality.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 
 import java.util.AbstractMap
 

compiler/testData/codegen/box/unsignedTypes/implicitIntegerCoercionNamedArg.kt

@@ -1,5 +1,6 @@
 // ISSUE: KT-57655
 // !LANGUAGE: +ImplicitSignedToUnsignedIntegerConversion
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61386
 // ALLOW_KOTLIN_PACKAGE
 // WITH_STDLIB
 // DUMP_IR

compiler/testData/codegen/box/vararg/varargsOverride.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // MODULE: lib
 // FILE: A.java
 

compiler/testData/codegen/box/vararg/varargsOverride2.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
 // MODULE: lib
 // FILE: A.java
 

compiler/testData/codegen/box/vararg/varargsOverride3.kt

@@ -1,4 +1,6 @@
 // TARGET_BACKEND: JVM
+// IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION: KT-61370
+
 // MODULE: lib
 // FILE: A.java
 

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/backend/ir/CodegenWithIrFakeOverrideGeneratorSuppressor.kt

@@ -0,0 +1,39 @@
+/*
+ * 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.test.backend.ir
+
+import org.jetbrains.kotlin.test.WrappedException
+import org.jetbrains.kotlin.test.directives.CodegenTestDirectives.ENABLE_IR_FAKE_OVERRIDE_GENERATION
+import org.jetbrains.kotlin.test.directives.CodegenTestDirectives.IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION
+import org.jetbrains.kotlin.test.model.AfterAnalysisChecker
+import org.jetbrains.kotlin.test.services.TestServices
+import org.jetbrains.kotlin.test.services.assertions
+import org.jetbrains.kotlin.test.services.moduleStructure
+
+class CodegenWithIrFakeOverrideGeneratorSuppressor(testServices: TestServices) : AfterAnalysisChecker(testServices) {
+    override fun check(failedAssertions: List<WrappedException>) {
+        if (!mainDirectiveEnabled) return
+        if (failedAssertions.isEmpty() && suppressDirectiveEnabled) {
+            testServices.assertions.fail {
+                "Looks like this test can be unmuted. Remove $IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION directive "
+            }
+        }
+    }
+
+    override fun suppressIfNeeded(failedAssertions: List<WrappedException>): List<WrappedException> {
+        return when {
+            !mainDirectiveEnabled -> failedAssertions
+            suppressDirectiveEnabled -> emptyList()
+            else -> failedAssertions
+        }
+    }
+
+    private val mainDirectiveEnabled: Boolean
+        get() = ENABLE_IR_FAKE_OVERRIDE_GENERATION in testServices.moduleStructure.allDirectives
+
+    private val suppressDirectiveEnabled: Boolean
+        get() = IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION in testServices.moduleStructure.allDirectives
+}

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/backend/ir/IrActualizerAndPluginsFacade.kt

@@ -39,7 +39,7 @@ class IrActualizerAndPluginsFacade(
                 inputArtifact.irPluginContext.symbolTable as SymbolTable, // TODO: it's strange place to get it.
                 inputArtifact.irMangler,
                 mapOf(module.name to module.friendDependencies.map { it.moduleName }),
-                useIrFakeOverrideBuilder = false,
+                useIrFakeOverrideBuilder = CodegenTestDirectives.ENABLE_IR_FAKE_OVERRIDE_GENERATION in module.directives,
             )
             inputArtifact.irActualizerResult = result
         }

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/directives/CodegenTestDirectives.kt

@@ -242,6 +242,19 @@ object CodegenTestDirectives : SimpleDirectivesContainer() {
             Ignore exceptions in AbstractFirLoadK2CompiledKotlin tests
         """.trimIndent()
     )
+
+    val ENABLE_IR_FAKE_OVERRIDE_GENERATION by directive(
+        description = """
+            Enables fake-override generation in FIR2IR using IR f/o generator. KT-61514
+        """.trimIndent()
+    )
+
+    // String to allow and enforce issue id. Value is not actually used.
+    val IGNORE_CODEGEN_WITH_IR_FAKE_OVERRIDE_GENERATION by stringDirective(
+        description = """
+            Suppresses test if $ENABLE_IR_FAKE_OVERRIDE_GENERATION directive enabled
+        """.trimIndent()
+    )
 }
 
 fun extractIgnoredDirectiveForTargetBackend(

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/Fir2IrJsResultsConverter.kt

@@ -10,10 +10,7 @@ import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
 import org.jetbrains.kotlin.backend.common.serialization.signature.IdSignatureDescriptor
 import org.jetbrains.kotlin.builtins.DefaultBuiltIns
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.config.CommonConfigurationKeys
+import org.jetbrains.kotlin.config.*
-import org.jetbrains.kotlin.config.CompilerConfiguration
-import org.jetbrains.kotlin.config.LanguageVersionSettings
-import org.jetbrains.kotlin.config.languageVersionSettings
 import org.jetbrains.kotlin.constant.EvaluatedConstTracker
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
@@ -172,6 +169,7 @@ fun ModuleCompilerAnalyzedOutput.convertToJsIr(
             .putIfAbsent(CommonConfigurationKeys.EVALUATED_CONST_TRACKER, EvaluatedConstTracker.create()),
         inlineConstTracker = null,
         allowNonCachedDeclarations = false,
+        useIrFakeOverrideBuilder = module.shouldUseIrFakeOverrideBuilderInConvertToIr()
     )
 
     return convertToIr(

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/Fir2IrJvmResultsConverter.kt

@@ -105,7 +105,8 @@ class Fir2IrJvmResultsConverter(
                 evaluatedConstTracker = compilerConfiguration
                     .putIfAbsent(CommonConfigurationKeys.EVALUATED_CONST_TRACKER, EvaluatedConstTracker.create()),
                 inlineConstTracker = compilerConfiguration[CommonConfigurationKeys.INLINE_CONST_TRACKER],
-                allowNonCachedDeclarations = false
+                allowNonCachedDeclarations = false,
+                useIrFakeOverrideBuilder = module.shouldUseIrFakeOverrideBuilderInConvertToIr(),
             )
             val (irModuleFragment, components, pluginContext) = firOutputPart.firAnalyzerFacade.result.outputs.single().convertToIr(
                 fir2IrExtensions,

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/Fir2IrResultsConverter.kt

@@ -5,16 +5,26 @@
 
 package org.jetbrains.kotlin.test.frontend.fir
 
+import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.platform.isCommon
 import org.jetbrains.kotlin.platform.isJs
 import org.jetbrains.kotlin.platform.jvm.isJvm
 import org.jetbrains.kotlin.test.backend.ir.IrBackendInput
+import org.jetbrains.kotlin.test.directives.CodegenTestDirectives
 import org.jetbrains.kotlin.test.model.BackendKinds
 import org.jetbrains.kotlin.test.model.Frontend2BackendConverter
 import org.jetbrains.kotlin.test.model.FrontendKinds
 import org.jetbrains.kotlin.test.model.TestModule
 import org.jetbrains.kotlin.test.services.TestServices
 
+/**
+ * In multi-platform projects this option is passed to IrActualizer instead
+ * @see [IrActualizerAndPluginsFacade]
+ */
+fun TestModule.shouldUseIrFakeOverrideBuilderInConvertToIr() =
+    CodegenTestDirectives.ENABLE_IR_FAKE_OVERRIDE_GENERATION in directives &&
+            !languageVersionSettings.supportsFeature(LanguageFeature.MultiPlatformProjects)
+
 class Fir2IrResultsConverter(
     testServices: TestServices
 ) : Frontend2BackendConverter<FirOutputArtifact, IrBackendInput>(

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/Fir2IrWasmResultsConverter.kt

@@ -167,7 +167,8 @@ fun ModuleCompilerAnalyzedOutput.convertToWasmIr(
         evaluatedConstTracker = configuration
             .putIfAbsent(CommonConfigurationKeys.EVALUATED_CONST_TRACKER, EvaluatedConstTracker.create()),
         inlineConstTracker = null,
-        allowNonCachedDeclarations = false
+        allowNonCachedDeclarations = false,
+        useIrFakeOverrideBuilder = module.shouldUseIrFakeOverrideBuilderInConvertToIr(),
     )
 
     return convertToIr(

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/runners/codegen/AbstractFirBlackBoxCodegenTest.kt

@@ -14,8 +14,10 @@ import org.jetbrains.kotlin.test.builders.configureFirHandlersStep
 import org.jetbrains.kotlin.test.directives.JvmEnvironmentConfigurationDirectives.USE_PSI_CLASS_FILES_READING
 import org.jetbrains.kotlin.test.directives.ConfigurationDirectives.WITH_STDLIB
 import org.jetbrains.kotlin.test.FirParser
+import org.jetbrains.kotlin.test.backend.ir.CodegenWithIrFakeOverrideGeneratorSuppressor
 import org.jetbrains.kotlin.test.backend.ir.IrDiagnosticsHandler
 import org.jetbrains.kotlin.test.builders.configureIrHandlersStep
+import org.jetbrains.kotlin.test.directives.CodegenTestDirectives.ENABLE_IR_FAKE_OVERRIDE_GENERATION
 import org.jetbrains.kotlin.test.directives.LanguageSettingsDirectives
 import org.jetbrains.kotlin.test.directives.configureFirParser
 import org.jetbrains.kotlin.test.frontend.fir.Fir2IrResultsConverter
@@ -90,3 +92,16 @@ open class AbstractFirLightTreeBlackBoxCodegenTest : AbstractFirBlackBoxCodegenT
 
 @FirPsiCodegenTest
 open class AbstractFirPsiBlackBoxCodegenTest : AbstractFirBlackBoxCodegenTestBase(FirParser.Psi)
+
+open class AbstractFirLightTreeBlackBoxCodegenWithIrFakeOverrideGeneratorTest : AbstractFirLightTreeBlackBoxCodegenTest() {
+    override fun configure(builder: TestConfigurationBuilder) {
+        super.configure(builder)
+        with(builder) {
+            defaultDirectives {
+                +ENABLE_IR_FAKE_OVERRIDE_GENERATION
+            }
+
+            useAfterAnalysisCheckers(::CodegenWithIrFakeOverrideGeneratorSuppressor)
+        }
+    }
+}

compiler/tests-for-compiler-generator/tests/org/jetbrains/kotlin/test/generators/GenerateJUnit5CompilerTests.kt

@@ -279,6 +279,10 @@ fun generateJUnit5CompilerTests(args: Array<String>, mainClassName: String?) {
                 model("codegen/box")
             }
 
+            testClass<AbstractFirLightTreeBlackBoxCodegenWithIrFakeOverrideGeneratorTest> {
+                model("codegen/box")
+            }
+
             testClass<AbstractFirLightTreeBlackBoxCodegenTest>("FirLightTreeBlackBoxModernJdkCodegenTestGenerated") {
                 model("codegen/boxModernJdk")
             }