[Test] Use special test facade for IR actualization and IR plugins in all codegen configurations

Previously application of plugins was part of fir2ir conversion and
  ir actualization was the responsibility of each specific IR backend
  facade. Now (after moving IR extensions after IR actualization) those
  actions are extracted into separate facade for two purposes:
1. Avoid code duplication in backend facades
2. Step with this facade goes exactly after fir2ir conversion before
   irHandlersStep, which allows IR handlers to observe IR which was
   actualized and modified by extensions, which is quite useful

^KT-56173

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

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.test.backend.ir
 
 import org.jetbrains.kotlin.backend.common.actualizer.IrActualizer
+import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
 import org.jetbrains.kotlin.backend.jvm.JvmIrTypeSystemContext
 import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.config.languageVersionSettings
@@ -16,33 +17,35 @@ import org.jetbrains.kotlin.test.model.*
 import org.jetbrains.kotlin.test.services.TestServices
 import org.jetbrains.kotlin.test.services.compilerConfigurationProvider
 
-class ActualizerOnlyFacade(
+class IrActualizerAndPluginsFacade(
     val testServices: TestServices,
 ) : AbstractTestFacade<IrBackendInput, IrBackendInput>() {
     override fun transform(module: TestModule, inputArtifact: IrBackendInput): IrBackendInput {
-        if (module.useIrActualizer()) {
+        if (module.frontendKind != FrontendKinds.FIR) return inputArtifact
+        if (module.languageVersionSettings.supportsFeature(LanguageFeature.MultiPlatformProjects)) {
             val builtins = inputArtifact.irModuleFragment.irBuiltins
             val typeSystemContext = when (module.targetPlatform.isJvm()) {
                 true -> JvmIrTypeSystemContext(builtins)
                 false -> IrTypeSystemContextImpl(builtins)
             }
-            IrActualizer.actualize(
+            val result = IrActualizer.actualize(
                 inputArtifact.irModuleFragment,
                 inputArtifact.dependentIrModuleFragments,
                 inputArtifact.diagnosticReporter,
                 typeSystemContext,
                 testServices.compilerConfigurationProvider.getCompilerConfiguration(module).languageVersionSettings
             )
-            inputArtifact.irPluginContext.applyIrGenerationExtensions(
+            inputArtifact.irActualizerResult = result
-                inputArtifact.irModuleFragment,
-                irGenerationExtensions = module.irGenerationExtensions(testServices)
-            )
         }
+        inputArtifact.irPluginContext.applyIrGenerationExtensions(
+            inputArtifact.irModuleFragment,
+            irGenerationExtensions = module.irGenerationExtensions(testServices)
+        )
         return inputArtifact
     }
 
-    private fun TestModule.useIrActualizer(): Boolean {
+    private fun TestModule.irGenerationExtensions(testServices: TestServices): Collection<IrGenerationExtension> {
-        return frontendKind == FrontendKinds.FIR && languageVersionSettings.supportsFeature(LanguageFeature.MultiPlatformProjects)
+        return IrGenerationExtension.getInstances(testServices.compilerConfigurationProvider.getProject(this))
     }
 
     override val inputKind: TestArtifactKind<IrBackendInput> = BackendKinds.IrBackend

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

@@ -67,6 +67,14 @@ sealed class IrBackendInput : ResultingArtifact.BackendInput<IrBackendInput>() {
      */
     abstract val firMangler: FirMangler?
 
+    /**
+     * Results of actualization, came from IrActulizer
+     *
+     * @see org.jetbrains.kotlin.backend.common.actualizer
+     * @see org.jetbrains.kotlin.test.backend.ir.IrActualizerAndPluginsFacade
+     */
+    abstract var irActualizerResult: IrActualizedResult?
+
     abstract val diagnosticReporter: BaseDiagnosticsCollector
 
     class JsIrBackendInput(
@@ -81,6 +89,7 @@ sealed class IrBackendInput : ResultingArtifact.BackendInput<IrBackendInput>() {
         override val descriptorMangler: KotlinMangler.DescriptorMangler,
         override val irMangler: KotlinMangler.IrMangler,
         override val firMangler: FirMangler?,
+        override var irActualizerResult: IrActualizedResult? = null,
         val serializeSingleFile: (KtSourceFile, IrActualizedResult?) -> ProtoBuf.PackageFragment,
     ) : IrBackendInput()
 
@@ -96,6 +105,7 @@ sealed class IrBackendInput : ResultingArtifact.BackendInput<IrBackendInput>() {
         override val descriptorMangler: KotlinMangler.DescriptorMangler,
         override val irMangler: KotlinMangler.IrMangler,
         override val firMangler: FirMangler?,
+        override var irActualizerResult: IrActualizedResult? = null,
         val serializeSingleFile: (KtSourceFile, IrActualizedResult?) -> ProtoBuf.PackageFragment,
     ) : IrBackendInput()
 
@@ -108,6 +118,7 @@ sealed class IrBackendInput : ResultingArtifact.BackendInput<IrBackendInput>() {
         override val descriptorMangler: KotlinMangler.DescriptorMangler,
         override val irMangler: KotlinMangler.IrMangler,
         override val firMangler: FirMangler?,
+        override var irActualizerResult: IrActualizedResult? = null,
     ) : IrBackendInput() {
         override val irModuleFragment: IrModuleFragment
             get() = backendInput.irModuleFragment

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

@@ -7,21 +7,19 @@ package org.jetbrains.kotlin.test.backend.ir
 
 import org.jetbrains.kotlin.KtPsiSourceFile
 import org.jetbrains.kotlin.backend.common.BackendException
-import org.jetbrains.kotlin.backend.common.actualizer.IrActualizer
-import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
-import org.jetbrains.kotlin.backend.jvm.JvmIrTypeSystemContext
 import org.jetbrains.kotlin.backend.jvm.MultifileFacadeFileEntry
 import org.jetbrains.kotlin.backend.jvm.lower.getFileClassInfoFromIrFile
-import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.fileClasses.JvmFileClassUtil
-import org.jetbrains.kotlin.fir.pipeline.applyIrGenerationExtensions
 import org.jetbrains.kotlin.ir.PsiIrFileEntry
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.util.NaiveSourceBasedFileEntryImpl
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.test.backend.classic.JavaCompilerFacade
 import org.jetbrains.kotlin.test.directives.CodegenTestDirectives
-import org.jetbrains.kotlin.test.model.*
+import org.jetbrains.kotlin.test.model.ArtifactKinds
+import org.jetbrains.kotlin.test.model.BinaryArtifacts
+import org.jetbrains.kotlin.test.model.SourceFileInfo
+import org.jetbrains.kotlin.test.model.TestModule
 import org.jetbrains.kotlin.test.services.TestServices
 import org.jetbrains.kotlin.test.services.compilerConfigurationProvider
 
@@ -37,21 +35,6 @@ class JvmIrBackendFacade(
         require(inputArtifact is IrBackendInput.JvmIrBackendInput) {
             "JvmIrBackendFacade expects IrBackendInput.JvmIrBackendInput as input"
         }
-
-        if (module.useIrActualizer()) {
-            IrActualizer.actualize(
-                inputArtifact.irModuleFragment,
-                inputArtifact.dependentIrModuleFragments,
-                inputArtifact.state.diagnosticReporter,
-                JvmIrTypeSystemContext(inputArtifact.irModuleFragment.irBuiltins),
-                inputArtifact.state.languageVersionSettings
-            )
-            inputArtifact.irPluginContext.applyIrGenerationExtensions(
-                inputArtifact.irModuleFragment,
-                module.irGenerationExtensions(testServices)
-            )
-        }
-
         val state = inputArtifact.state
         try {
             inputArtifact.codegenFactory.generateModule(state, inputArtifact.backendInput)
@@ -97,11 +80,3 @@ class JvmIrBackendFacade(
         )
     }
 }
-
-internal fun TestModule.useIrActualizer(): Boolean {
-    return frontendKind == FrontendKinds.FIR && languageVersionSettings.supportsFeature(LanguageFeature.MultiPlatformProjects)
-}
-
-fun TestModule.irGenerationExtensions(testServices: TestServices): Collection<IrGenerationExtension> {
-    return IrGenerationExtension.getInstances(testServices.compilerConfigurationProvider.getProject(this))
-}

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

@@ -42,8 +42,6 @@ import org.jetbrains.kotlin.library.metadata.resolver.KotlinResolvedLibrary
 import org.jetbrains.kotlin.library.unresolvedDependencies
 import org.jetbrains.kotlin.storage.LockBasedStorageManager
 import org.jetbrains.kotlin.test.backend.ir.IrBackendInput
-import org.jetbrains.kotlin.test.backend.ir.irGenerationExtensions
-import org.jetbrains.kotlin.test.backend.ir.useIrActualizer
 import org.jetbrains.kotlin.test.directives.CodegenTestDirectives
 import org.jetbrains.kotlin.test.model.BackendKinds
 import org.jetbrains.kotlin.test.model.Frontend2BackendConverter
@@ -156,13 +154,6 @@ class Fir2IrJsResultsConverter(
             )
         }
 
-        if (!module.useIrActualizer()) {
-            result.irPluginContext.applyIrGenerationExtensions(
-                result.irModuleFragment,
-                irGenerationExtensions = module.irGenerationExtensions(testServices)
-            )
-        }
-
         return result
     }
 }

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

@@ -30,8 +30,6 @@ import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.resolve.CompilerEnvironment
 import org.jetbrains.kotlin.resolve.lazy.declarations.FileBasedDeclarationProviderFactory
 import org.jetbrains.kotlin.test.backend.ir.IrBackendInput
-import org.jetbrains.kotlin.test.backend.ir.irGenerationExtensions
-import org.jetbrains.kotlin.test.backend.ir.useIrActualizer
 import org.jetbrains.kotlin.test.directives.CodegenTestDirectives
 import org.jetbrains.kotlin.test.model.BackendKinds
 import org.jetbrains.kotlin.test.model.Frontend2BackendConverter
@@ -140,13 +138,6 @@ class Fir2IrJvmResultsConverter(
             firMangler = commonMemberStorage.firSignatureComposer.mangler,
         )
 
-        if (!module.useIrActualizer()) {
-            result.irPluginContext.applyIrGenerationExtensions(
-                backendInput.irModuleFragment,
-                irGenerationExtensions = module.irGenerationExtensions(testServices)
-            )
-        }
-
         return result
     }
 }

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

@@ -11,7 +11,7 @@ import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.symbols.FirLazyDeclarationResolver
 import org.jetbrains.kotlin.platform.jvm.JvmPlatforms
 import org.jetbrains.kotlin.test.*
-import org.jetbrains.kotlin.test.backend.ir.ActualizerOnlyFacade
+import org.jetbrains.kotlin.test.backend.ir.IrActualizerAndPluginsFacade
 import org.jetbrains.kotlin.test.backend.ir.IrDiagnosticsHandler
 import org.jetbrains.kotlin.test.builders.TestConfigurationBuilder
 import org.jetbrains.kotlin.test.builders.configureFirHandlersStep
@@ -99,7 +99,7 @@ abstract class AbstractFirWithActualizerDiagnosticsTest(val parser: FirParser) :
         baseFirDiagnosticTestConfiguration()
 
         facadeStep(::Fir2IrResultsConverter)
-        facadeStep(::ActualizerOnlyFacade)
+        facadeStep(::IrActualizerAndPluginsFacade)
         irHandlersStep {
             useHandlers(
                 ::IrDiagnosticsHandler

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

@@ -14,6 +14,8 @@ 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.IrDiagnosticsHandler
+import org.jetbrains.kotlin.test.builders.configureIrHandlersStep
 import org.jetbrains.kotlin.test.directives.LanguageSettingsDirectives
 import org.jetbrains.kotlin.test.directives.configureFirParser
 import org.jetbrains.kotlin.test.frontend.fir.Fir2IrResultsConverter
@@ -65,6 +67,10 @@ abstract class AbstractFirBlackBoxCodegenTestBase(
                 )
             }
 
+            configureIrHandlersStep {
+                useHandlers(::IrDiagnosticsHandler)
+            }
+
             useAfterAnalysisCheckers(
                 ::FirMetaInfoDiffSuppressor
             )

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

@@ -11,7 +11,9 @@ import org.jetbrains.kotlin.test.Constructor
 import org.jetbrains.kotlin.test.HandlersStepBuilder
 import org.jetbrains.kotlin.test.TestJdkKind
 import org.jetbrains.kotlin.test.backend.handlers.*
+import org.jetbrains.kotlin.test.backend.ir.IrActualizerAndPluginsFacade
 import org.jetbrains.kotlin.test.backend.ir.IrBackendInput
+import org.jetbrains.kotlin.test.backend.ir.IrDiagnosticsHandler
 import org.jetbrains.kotlin.test.builders.*
 import org.jetbrains.kotlin.test.directives.CodegenTestDirectives
 import org.jetbrains.kotlin.test.directives.CodegenTestDirectives.DUMP_SMAP
@@ -39,6 +41,7 @@ fun <F : ResultingArtifact.FrontendOutput<F>, B : ResultingArtifact.BackendInput
     classicFrontendHandlersStep()
     firHandlersStep()
     facadeStep(frontendToBackendConverter)
+    actualizersAndPluginsFacadeStepIfNeeded(targetFrontend)
     irHandlersStep(init = {})
     facadeStep(backendFacade)
     jvmArtifactsHandlersStep(init = {})
@@ -194,6 +197,12 @@ fun HandlersStepBuilder<BinaryArtifacts.Jvm>.inlineHandlers() {
     )
 }
 
+fun TestConfigurationBuilder.actualizersAndPluginsFacadeStepIfNeeded(targetFrontend: FrontendKind<*>) {
+    if (targetFrontend == FrontendKinds.FIR) {
+        facadeStep(::IrActualizerAndPluginsFacade)
+    }
+}
+
 fun TestConfigurationBuilder.configureModernJavaTest(jdkKind: TestJdkKind, jvmTarget: JvmTarget) {
     defaultDirectives {
         JvmEnvironmentConfigurationDirectives.JDK_KIND with jdkKind

js/js.tests/test/org/jetbrains/kotlin/js/test/converters/FirJsKlibBackendFacade.kt

@@ -6,18 +6,13 @@
 package org.jetbrains.kotlin.js.test.converters
 
 import org.jetbrains.kotlin.backend.common.CommonKLibResolver
-import org.jetbrains.kotlin.backend.common.actualizer.IrActualizer
 import org.jetbrains.kotlin.config.CommonConfigurationKeys
-import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.config.languageVersionSettings
 import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
-import org.jetbrains.kotlin.diagnostics.DiagnosticReporterFactory
-import org.jetbrains.kotlin.fir.pipeline.applyIrGenerationExtensions
 import org.jetbrains.kotlin.incremental.components.LookupTracker
 import org.jetbrains.kotlin.ir.backend.js.JsFactories
 import org.jetbrains.kotlin.ir.backend.js.resolverLogger
 import org.jetbrains.kotlin.ir.backend.js.serializeModuleIntoKlib
-import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.ir.util.IrMessageLogger
 import org.jetbrains.kotlin.js.test.utils.JsIrIncrementalDataProvider
 import org.jetbrains.kotlin.js.test.utils.jsIrIncrementalDataProvider
@@ -25,14 +20,12 @@ import org.jetbrains.kotlin.library.KotlinAbiVersion
 import org.jetbrains.kotlin.storage.LockBasedStorageManager
 import org.jetbrains.kotlin.test.backend.ir.IrBackendFacade
 import org.jetbrains.kotlin.test.backend.ir.IrBackendInput
-import org.jetbrains.kotlin.test.backend.ir.irGenerationExtensions
 import org.jetbrains.kotlin.test.frontend.classic.ModuleDescriptorProvider
 import org.jetbrains.kotlin.test.frontend.classic.moduleDescriptorProvider
 import org.jetbrains.kotlin.test.frontend.fir.getAllJsDependenciesPaths
 import org.jetbrains.kotlin.test.frontend.fir.resolveLibraries
 import org.jetbrains.kotlin.test.model.ArtifactKinds
 import org.jetbrains.kotlin.test.model.BinaryArtifacts
-import org.jetbrains.kotlin.test.model.FrontendKinds
 import org.jetbrains.kotlin.test.model.TestModule
 import org.jetbrains.kotlin.test.services.*
 import org.jetbrains.kotlin.test.services.configuration.JsEnvironmentConfigurator
@@ -64,28 +57,7 @@ class FirJsKlibBackendFacade(
         // TODO: consider avoiding repeated libraries resolution
         val libraries = resolveLibraries(configuration, getAllJsDependenciesPaths(module, testServices))
 
-        // TODO: find out how to pass diagnostics to the test infra in this case
-        val diagnosticReporter = DiagnosticReporterFactory.createReporter()
-
         if (firstTimeCompilation) {
-            val irActualizedResult =
-                if (module.frontendKind == FrontendKinds.FIR && module.languageVersionSettings.supportsFeature(LanguageFeature.MultiPlatformProjects)) {
-                    IrActualizer.actualize(
-                        inputArtifact.irModuleFragment,
-                        inputArtifact.dependentIrModuleFragments,
-                        diagnosticReporter,
-                        IrTypeSystemContextImpl(inputArtifact.irModuleFragment.irBuiltins),
-                        configuration.languageVersionSettings
-                    ).also {
-                        inputArtifact.irPluginContext.applyIrGenerationExtensions(
-                            inputArtifact.irModuleFragment,
-                            irGenerationExtensions = module.irGenerationExtensions(testServices)
-                        )
-                    }
-                } else {
-                    null
-                }
-
             serializeModuleIntoKlib(
                 configuration[CommonConfigurationKeys.MODULE_NAME]!!,
                 configuration,
@@ -102,7 +74,7 @@ class FirJsKlibBackendFacade(
                 abiVersion = KotlinAbiVersion.CURRENT, // TODO get from test file data
                 jsOutputName = null
             ) {
-                inputArtifact.serializeSingleFile(it, irActualizedResult)
+                inputArtifact.serializeSingleFile(it, inputArtifact.irActualizerResult)
             }
         }
 

js/js.tests/test/org/jetbrains/kotlin/js/test/converters/JsKlibBackendFacade.kt

@@ -32,7 +32,7 @@ class JsKlibBackendFacade(
     override val additionalServices: List<ServiceRegistrationData>
         get() = listOf(service(::JsIrIncrementalDataProvider))
 
-    constructor(testServices: TestServices): this(testServices, firstTimeCompilation = true)
+    constructor(testServices: TestServices) : this(testServices, firstTimeCompilation = true)
 
     override fun shouldRunAnalysis(module: TestModule): Boolean {
         return module.backendKind == inputKind
@@ -63,7 +63,7 @@ class JsKlibBackendFacade(
                 abiVersion = KotlinAbiVersion.CURRENT, // TODO get from test file data
                 jsOutputName = null
             ) {
-                inputArtifact.serializeSingleFile(it, null)
+                inputArtifact.serializeSingleFile(it, inputArtifact.irActualizerResult)
             }
         }
 

js/js.tests/test/org/jetbrains/kotlin/js/test/ir/AbstractJsBlackBoxCodegenTestBase.kt

@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.test.frontend.classic.handlers.ClassicDiagnosticsHan
 import org.jetbrains.kotlin.test.frontend.fir.handlers.FirDiagnosticsHandler
 import org.jetbrains.kotlin.test.model.*
 import org.jetbrains.kotlin.test.runners.AbstractKotlinCompilerWithTargetBackendTest
+import org.jetbrains.kotlin.test.runners.codegen.actualizersAndPluginsFacadeStepIfNeeded
 import org.jetbrains.kotlin.test.runners.codegen.commonClassicFrontendHandlersForCodegenTest
 import org.jetbrains.kotlin.test.services.LibraryProvider
 import org.jetbrains.kotlin.test.services.configuration.CommonEnvironmentConfigurator
@@ -154,6 +155,7 @@ fun <
     }
 
     facadeStep(frontendToBackendConverter)
+    actualizersAndPluginsFacadeStepIfNeeded(targetFrontend)
     irHandlersStep()
 
     facadeStep(backendFacade)

wasm/wasm.tests/test/org/jetbrains/kotlin/wasm/test/AbstractWasmBlackBoxCodegenTestBase.kt

@@ -19,9 +19,9 @@ import org.jetbrains.kotlin.test.frontend.classic.handlers.ClassicDiagnosticsHan
 import org.jetbrains.kotlin.test.frontend.fir.handlers.FirDiagnosticsHandler
 import org.jetbrains.kotlin.test.model.*
 import org.jetbrains.kotlin.test.runners.AbstractKotlinCompilerWithTargetBackendTest
+import org.jetbrains.kotlin.test.runners.codegen.actualizersAndPluginsFacadeStepIfNeeded
 import org.jetbrains.kotlin.test.runners.codegen.commonClassicFrontendHandlersForCodegenTest
 import org.jetbrains.kotlin.test.services.LibraryProvider
-import org.jetbrains.kotlin.test.services.configuration.CommonEnvironmentConfigurator
 import org.jetbrains.kotlin.test.services.configuration.WasmEnvironmentConfigurator
 import org.jetbrains.kotlin.test.services.sourceProviders.CoroutineHelpersSourceFilesProvider
 import org.jetbrains.kotlin.wasm.test.handlers.WasmBoxRunner
@@ -90,7 +90,7 @@ abstract class AbstractWasmBlackBoxCodegenTestBase<R : ResultingArtifact.Fronten
 
         facadeStep(frontendToBackendConverter)
         irHandlersStep()
-
+        actualizersAndPluginsFacadeStepIfNeeded(targetFrontend)
         facadeStep(backendFacade)
         klibArtifactsHandlersStep()
         facadeStep(afterBackendFacade)

wasm/wasm.tests/test/org/jetbrains/kotlin/wasm/test/converters/FirWasmKlibBackendFacade.kt

@@ -6,31 +6,24 @@
 package org.jetbrains.kotlin.wasm.test.converters
 
 import org.jetbrains.kotlin.backend.common.CommonKLibResolver
-import org.jetbrains.kotlin.backend.common.actualizer.IrActualizer
 import org.jetbrains.kotlin.config.CommonConfigurationKeys
-import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.config.languageVersionSettings
 import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
-import org.jetbrains.kotlin.diagnostics.DiagnosticReporterFactory
-import org.jetbrains.kotlin.fir.pipeline.applyIrGenerationExtensions
 import org.jetbrains.kotlin.incremental.components.LookupTracker
 import org.jetbrains.kotlin.ir.backend.js.JsFactories
 import org.jetbrains.kotlin.ir.backend.js.resolverLogger
 import org.jetbrains.kotlin.ir.backend.js.serializeModuleIntoKlib
-import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.ir.util.IrMessageLogger
 import org.jetbrains.kotlin.library.KotlinAbiVersion
 import org.jetbrains.kotlin.storage.LockBasedStorageManager
 import org.jetbrains.kotlin.test.backend.ir.IrBackendFacade
 import org.jetbrains.kotlin.test.backend.ir.IrBackendInput
-import org.jetbrains.kotlin.test.backend.ir.irGenerationExtensions
 import org.jetbrains.kotlin.test.frontend.classic.ModuleDescriptorProvider
 import org.jetbrains.kotlin.test.frontend.classic.moduleDescriptorProvider
 import org.jetbrains.kotlin.test.frontend.fir.getAllWasmDependenciesPaths
 import org.jetbrains.kotlin.test.frontend.fir.resolveLibraries
 import org.jetbrains.kotlin.test.model.ArtifactKinds
 import org.jetbrains.kotlin.test.model.BinaryArtifacts
-import org.jetbrains.kotlin.test.model.FrontendKinds
 import org.jetbrains.kotlin.test.model.TestModule
 import org.jetbrains.kotlin.test.services.*
 import org.jetbrains.kotlin.test.services.configuration.WasmEnvironmentConfigurator
@@ -61,28 +54,7 @@ class FirWasmKlibBackendFacade(
         // TODO: consider avoiding repeated libraries resolution
         val libraries = resolveLibraries(configuration, getAllWasmDependenciesPaths(module, testServices))
 
-        // TODO: find out how to pass diagnostics to the test infra in this case
-        val diagnosticReporter = DiagnosticReporterFactory.createReporter()
-
         if (firstTimeCompilation) {
-            val irActualizedResult =
-                if (module.frontendKind == FrontendKinds.FIR && module.languageVersionSettings.supportsFeature(LanguageFeature.MultiPlatformProjects)) {
-                    IrActualizer.actualize(
-                        inputArtifact.irModuleFragment,
-                        inputArtifact.dependentIrModuleFragments,
-                        diagnosticReporter,
-                        IrTypeSystemContextImpl(inputArtifact.irModuleFragment.irBuiltins),
-                        configuration.languageVersionSettings
-                    ).also {
-                        inputArtifact.irPluginContext.applyIrGenerationExtensions(
-                            inputArtifact.irModuleFragment,
-                            irGenerationExtensions = module.irGenerationExtensions(testServices)
-                        )
-                    }
-                } else {
-                    null
-                }
-
             serializeModuleIntoKlib(
                 configuration[CommonConfigurationKeys.MODULE_NAME]!!,
                 configuration,
@@ -99,7 +71,7 @@ class FirWasmKlibBackendFacade(
                 abiVersion = KotlinAbiVersion.CURRENT, // TODO get from test file data
                 jsOutputName = null
             ) {
-                inputArtifact.serializeSingleFile(it, irActualizedResult)
+                inputArtifact.serializeSingleFile(it, inputArtifact.irActualizerResult)
             }
         }