[FIR2IR] Make convertAndActualize method the only entrypoint to fir2ir

Fir2Ir conversion consists of multiple steps with complex logic (like
  conversion of each module, actualization, plugins application, constant
  evaluation), and to ensure that they all are executed correctly it's
  convenient to have the single entry point for all this machinery

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirCompilerFacility.kt

@@ -16,11 +16,7 @@ import org.jetbrains.kotlin.analysis.api.diagnostics.KtDiagnostic
 import org.jetbrains.kotlin.analysis.api.fir.KtFirAnalysisSession
 import org.jetbrains.kotlin.analysis.api.impl.base.util.KtCompiledFileForOutputFile
 import org.jetbrains.kotlin.analysis.low.level.api.fir.LLFirInternals
-import org.jetbrains.kotlin.analysis.low.level.api.fir.api.DiagnosticCheckerFilter
+import org.jetbrains.kotlin.analysis.low.level.api.fir.api.*
-import org.jetbrains.kotlin.analysis.low.level.api.fir.api.LLFirResolveSession
-import org.jetbrains.kotlin.analysis.low.level.api.fir.api.collectDiagnosticsForFile
-import org.jetbrains.kotlin.analysis.low.level.api.fir.api.getModule
-import org.jetbrains.kotlin.analysis.low.level.api.fir.api.getOrBuildFirFile
 import org.jetbrains.kotlin.analysis.low.level.api.fir.compile.CodeFragmentCapturedId
 import org.jetbrains.kotlin.analysis.low.level.api.fir.compile.CodeFragmentCapturedValueAnalyzer
 import org.jetbrains.kotlin.analysis.low.level.api.fir.compile.CompilationPeerCollector
@@ -73,11 +69,7 @@ import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import org.jetbrains.kotlin.ir.types.IrSimpleType
-import org.jetbrains.kotlin.ir.util.DelicateSymbolTableApi
+import org.jetbrains.kotlin.ir.util.*
-import org.jetbrains.kotlin.ir.util.IdSignature
-import org.jetbrains.kotlin.ir.util.classId
-import org.jetbrains.kotlin.ir.util.StubGeneratorExtensions
-import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
@@ -91,7 +83,7 @@ import org.jetbrains.kotlin.resolve.source.PsiSourceFile
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
 import org.jetbrains.kotlin.utils.addIfNotNull
 import org.jetbrains.kotlin.utils.addToStdlib.runIf
-import java.util.Collections
+import java.util.*
 
 internal class KtFirCompilerFacility(
     override val analysisSession: KtFirAnalysisSession
@@ -185,7 +177,7 @@ internal class KtFirCompilerFacility(
         ProgressManager.checkCanceled()
 
         val irGeneratorExtensions = IrGenerationExtension.getInstances(project)
-        targetFir2IrResult.components.applyIrGenerationExtensions(targetFir2IrResult.irModuleFragment, irGeneratorExtensions)
+        targetFir2IrResult.pluginContext.applyIrGenerationExtensions(targetFir2IrResult.irModuleFragment, irGeneratorExtensions)
 
         val bindingContext = NoScopeRecordCliBindingTrace().bindingContext
         val codegenFactory = createJvmIrCodegenFactory(targetConfiguration, file is KtCodeFragment, targetFir2IrResult.irModuleFragment)

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/klib/compilerPipeline.kt

@@ -261,8 +261,8 @@ fun transformFirToIr(
         visibilityConverter = Fir2IrVisibilityConverter.Default,
         kotlinBuiltIns = builtInsModule ?: DefaultBuiltIns.Instance,
         actualizerTypeContextProvider = ::IrTypeSystemContextImpl
-    ) {
+    ) { _, irPart ->
-        (this.irModuleFragment.descriptor as? FirModuleDescriptor)?.let { it.allDependencyModules = librariesDescriptors }
+        (irPart.irModuleFragment.descriptor as? FirModuleDescriptor)?.let { it.allDependencyModules = librariesDescriptors }
     }
 }
 

compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/pipeline/convertToIr.kt

@@ -31,29 +31,7 @@ data class ModuleCompilerAnalyzedOutput(
     val session: FirSession,
     val scopeSession: ScopeSession,
     val fir: List<FirFile>
-) {
+)
-    fun convertToIr(
-        fir2IrExtensions: Fir2IrExtensions,
-        fir2IrConfiguration: Fir2IrConfiguration,
-        commonMemberStorage: Fir2IrCommonMemberStorage,
-        irBuiltIns: IrBuiltInsOverFir?,
-        irMangler: KotlinMangler.IrMangler,
-        visibilityConverter: Fir2IrVisibilityConverter,
-        kotlinBuiltIns: KotlinBuiltIns,
-        typeContextProvider: (IrBuiltIns) -> IrTypeSystemContext,
-    ): Fir2IrResult {
-        return Fir2IrConverter.createIrModuleFragment(
-            session, scopeSession, fir,
-            fir2IrExtensions, fir2IrConfiguration,
-            irMangler, IrFactoryImpl, visibilityConverter,
-            Fir2IrJvmSpecialAnnotationSymbolProvider(), // TODO KT-60526: replace with appropriate (probably empty) implementation for other backends.
-            kotlinBuiltIns = kotlinBuiltIns,
-            commonMemberStorage = commonMemberStorage,
-            initializedIrBuiltIns = irBuiltIns,
-            typeContextProvider = typeContextProvider
-        )
-    }
-}
 
 data class Fir2IrActualizedResult(
     val irModuleFragment: IrModuleFragment,
@@ -81,7 +59,7 @@ fun FirResult.convertToIrAndActualize(
     visibilityConverter: Fir2IrVisibilityConverter,
     kotlinBuiltIns: KotlinBuiltIns,
     actualizerTypeContextProvider: (IrBuiltIns) -> IrTypeSystemContext,
-    fir2IrResultPostCompute: Fir2IrResult.() -> Unit = {},
+    fir2IrResultPostCompute: (ModuleCompilerAnalyzedOutput, Fir2IrResult) -> Unit = { _, _ -> },
 ): Fir2IrActualizedResult {
     val fir2IrResult: Fir2IrResult
     val actualizationResult: IrActualizedResult?
@@ -91,7 +69,9 @@ fun FirResult.convertToIrAndActualize(
     when (outputs.size) {
         0 -> error("No modules found")
         1 -> {
-            fir2IrResult = outputs.single().convertToIr(
+            val output = outputs.single()
+            fir2IrResult = convertToIr(
+                output,
                 fir2IrExtensions,
                 fir2IrConfiguration,
                 commonMemberStorage = commonMemberStorage,
@@ -101,7 +81,7 @@ fun FirResult.convertToIrAndActualize(
                 kotlinBuiltIns,
                 actualizerTypeContextProvider,
             ).also { result ->
-                fir2IrResultPostCompute(result)
+                fir2IrResultPostCompute(output, result)
             }
             actualizationResult = null
         }
@@ -110,10 +90,11 @@ fun FirResult.convertToIrAndActualize(
             val commonOutputs = outputs.dropLast(1)
             var irBuiltIns: IrBuiltInsOverFir? = null
             val commonIrOutputs = commonOutputs.map {
-                it.convertToIr(
+                convertToIr(
-                    fir2IrExtensions,
+                    it,
                     // We need to build all modules before rebuilding fake overrides
                     // to avoid fixing declaration storages
+                    fir2IrExtensions,
                     fir2IrConfiguration.copy(useIrFakeOverrideBuilder = false),
                     commonMemberStorage = commonMemberStorage,
                     irBuiltIns = irBuiltIns,
@@ -122,13 +103,14 @@ fun FirResult.convertToIrAndActualize(
                     kotlinBuiltIns,
                     actualizerTypeContextProvider,
                 ).also { result ->
-                    fir2IrResultPostCompute(result)
+                    fir2IrResultPostCompute(it, result)
                     if (irBuiltIns == null) {
                         irBuiltIns = result.components.irBuiltIns
                     }
                 }
             }
-            fir2IrResult = platformOutput.convertToIr(
+            fir2IrResult = convertToIr(
+                platformOutput,
                 fir2IrExtensions,
                 fir2IrConfiguration,
                 commonMemberStorage = commonMemberStorage,
@@ -138,7 +120,7 @@ fun FirResult.convertToIrAndActualize(
                 kotlinBuiltIns,
                 actualizerTypeContextProvider,
             ).also {
-                fir2IrResultPostCompute(it)
+                fir2IrResultPostCompute(platformOutput, it)
             }
 
             actualizationResult = IrActualizer.actualize(
@@ -158,13 +140,31 @@ fun FirResult.convertToIrAndActualize(
     }
 
     val (irModuleFragment, components, pluginContext) = fir2IrResult
-    components.applyIrGenerationExtensions(irModuleFragment, irGeneratorExtensions)
+    pluginContext.applyIrGenerationExtensions(irModuleFragment, irGeneratorExtensions)
     return Fir2IrActualizedResult(irModuleFragment, components, pluginContext, actualizationResult)
 }
 
-fun Fir2IrComponents.applyIrGenerationExtensions(irModuleFragment: IrModuleFragment, irGenerationExtensions: Collection<IrGenerationExtension>) {
+private fun convertToIr(
-    if (irGenerationExtensions.isEmpty()) return
+    firOutput: ModuleCompilerAnalyzedOutput,
-    Fir2IrPluginContext(this, irModuleFragment.descriptor).applyIrGenerationExtensions(irModuleFragment, irGenerationExtensions)
+    fir2IrExtensions: Fir2IrExtensions,
+    fir2IrConfiguration: Fir2IrConfiguration,
+    commonMemberStorage: Fir2IrCommonMemberStorage,
+    irBuiltIns: IrBuiltInsOverFir?,
+    irMangler: KotlinMangler.IrMangler,
+    visibilityConverter: Fir2IrVisibilityConverter,
+    kotlinBuiltIns: KotlinBuiltIns,
+    typeContextProvider: (IrBuiltIns) -> IrTypeSystemContext,
+): Fir2IrResult {
+    return Fir2IrConverter.createIrModuleFragment(
+        firOutput.session, firOutput.scopeSession, firOutput.fir,
+        fir2IrExtensions, fir2IrConfiguration,
+        irMangler, IrFactoryImpl, visibilityConverter,
+        Fir2IrJvmSpecialAnnotationSymbolProvider(), // TODO KT-60526: replace with appropriate (probably empty) implementation for other backends.
+        kotlinBuiltIns = kotlinBuiltIns,
+        commonMemberStorage = commonMemberStorage,
+        initializedIrBuiltIns = irBuiltIns,
+        typeContextProvider = typeContextProvider
+    )
 }
 
 fun IrPluginContext.applyIrGenerationExtensions(irModuleFragment: IrModuleFragment, irGenerationExtensions: Collection<IrGenerationExtension>) {

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

@@ -73,7 +73,7 @@ sealed class IrBackendInput : ResultingArtifact.BackendInput<IrBackendInput>() {
         override val descriptorMangler: KotlinMangler.DescriptorMangler,
         override val irMangler: KotlinMangler.IrMangler,
         override val firMangler: FirMangler?,
-        val serializeSingleFile: (KtSourceFile, IrActualizedResult?) -> ProtoBuf.PackageFragment,
+        val serializeSingleFile: (KtSourceFile) -> ProtoBuf.PackageFragment,
     ) : IrBackendInput()
 
     data class JsIrDeserializedFromKlibBackendInput(
@@ -99,7 +99,7 @@ sealed class IrBackendInput : ResultingArtifact.BackendInput<IrBackendInput>() {
         override val descriptorMangler: KotlinMangler.DescriptorMangler,
         override val irMangler: KotlinMangler.IrMangler,
         override val firMangler: FirMangler?,
-        val serializeSingleFile: (KtSourceFile, IrActualizedResult?) -> ProtoBuf.PackageFragment,
+        val serializeSingleFile: (KtSourceFile) -> ProtoBuf.PackageFragment,
     ) : IrBackendInput()
 
     class JvmIrBackendInput(

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/classic/ClassicFrontend2IrConverter.kt

@@ -117,7 +117,7 @@ class ClassicFrontend2IrConverter(
             descriptorMangler = (pluginContext.symbolTable as SymbolTable).signaturer.mangler,
             irMangler = JsManglerIr,
             firMangler = null,
-        ) { file, _ ->
+        ) { file ->
             metadataSerializer.serializeScope(file, analysisResult.bindingContext, moduleFragment.descriptor)
         }
     }
@@ -159,7 +159,7 @@ class ClassicFrontend2IrConverter(
             descriptorMangler = (pluginContext.symbolTable as SymbolTable).signaturer.mangler,
             irMangler = JsManglerIr,
             firMangler = null,
-        ) { file, _ ->
+        ) { file ->
             metadataSerializer.serializeScope(file, analysisResult.bindingContext, moduleFragment.descriptor)
         }
     }

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

@@ -6,22 +6,24 @@
 package org.jetbrains.kotlin.test.frontend.fir
 
 import org.jetbrains.kotlin.KtSourceFile
-import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
+import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
 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.*
+import org.jetbrains.kotlin.config.CommonConfigurationKeys
+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
-import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
 import org.jetbrains.kotlin.diagnostics.DiagnosticReporterFactory
 import org.jetbrains.kotlin.fir.backend.*
 import org.jetbrains.kotlin.fir.backend.js.FirJsKotlinMangler
-import org.jetbrains.kotlin.fir.declarations.FirDeclaration
 import org.jetbrains.kotlin.fir.declarations.FirFile
 import org.jetbrains.kotlin.fir.descriptors.FirModuleDescriptor
+import org.jetbrains.kotlin.fir.pipeline.FirResult
 import org.jetbrains.kotlin.fir.pipeline.ModuleCompilerAnalyzedOutput
+import org.jetbrains.kotlin.fir.pipeline.convertToIrAndActualize
 import org.jetbrains.kotlin.fir.serialization.FirKLibSerializerExtension
 import org.jetbrains.kotlin.fir.serialization.serializeSingleFirFile
 import org.jetbrains.kotlin.incremental.components.LookupTracker
@@ -30,7 +32,6 @@ import org.jetbrains.kotlin.ir.backend.js.getSerializedData
 import org.jetbrains.kotlin.ir.backend.js.incrementalDataProvider
 import org.jetbrains.kotlin.ir.backend.js.lower.serialization.ir.JsManglerDesc
 import org.jetbrains.kotlin.ir.backend.js.lower.serialization.ir.JsManglerIr
-import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.library.metadata.resolver.KotlinResolvedLibrary
 import org.jetbrains.kotlin.library.unresolvedDependencies
@@ -70,92 +71,12 @@ class Fir2IrJsResultsConverter(
         inputArtifact: FirOutputArtifact
     ): IrBackendInput {
         val configuration = testServices.compilerConfigurationProvider.getCompilerConfiguration(module)
-
-        lateinit var mainIrPart: IrModuleFragment
-        val dependentIrParts = mutableListOf<IrModuleFragment>()
         val sourceFiles = mutableListOf<KtSourceFile>()
         val firFilesAndComponentsBySourceFile = mutableMapOf<KtSourceFile, Pair<FirFile, Fir2IrComponents>>()
-        lateinit var mainPluginContext: IrPluginContext
-        var irBuiltIns: IrBuiltInsOverFir? = null
-
-        val commonMemberStorage = Fir2IrCommonMemberStorage(IdSignatureDescriptor(JsManglerDesc), FirJsKotlinMangler())
 
         val irMangler = JsManglerIr
         val diagnosticReporter = DiagnosticReporterFactory.createReporter()
 
-        for ((index, part) in inputArtifact.partsForDependsOnModules.withIndex()) {
-            val (irModuleFragment, components, pluginContext) =
-                part.firAnalyzerFacade.result.outputs.single().convertToJsIr(
-                    testServices,
-                    module,
-                    configuration,
-                    diagnosticReporter,
-                    commonMemberStorage,
-                    irBuiltIns,
-                )
-            irBuiltIns = components.irBuiltIns
-            mainPluginContext = pluginContext
-
-            if (index < inputArtifact.partsForDependsOnModules.size - 1) {
-                dependentIrParts.add(irModuleFragment)
-            } else {
-                mainIrPart = irModuleFragment
-            }
-
-            sourceFiles.addAll(part.firFiles.mapNotNull { it.value.sourceFile })
-
-            for (firFile in part.firFiles.values) {
-                firFilesAndComponentsBySourceFile[firFile.sourceFile!!] = firFile to components
-            }
-        }
-
-        val metadataVersion = configuration.metadataVersion(module.languageVersionSettings.languageVersion)
-
-        var actualizedExpectDeclarations: Set<FirDeclaration>? = null
-
-        val result = IrBackendInput.JsIrBackendInput(
-            mainIrPart,
-            mainPluginContext,
-            sourceFiles,
-            configuration.incrementalDataProvider?.getSerializedData(sourceFiles) ?: emptyList(),
-            diagnosticReporter = diagnosticReporter,
-            hasErrors = inputArtifact.hasErrors,
-            descriptorMangler = commonMemberStorage.symbolTable.signaturer.mangler,
-            irMangler = irMangler,
-            firMangler = commonMemberStorage.firSignatureComposer.mangler,
-        ) { file, irActualizedResult ->
-            val (firFile, components) = firFilesAndComponentsBySourceFile[file]
-                ?: error("cannot find FIR file by source file ${file.name} (${file.path})")
-            if (actualizedExpectDeclarations == null && irActualizedResult != null) {
-                actualizedExpectDeclarations = irActualizedResult.actualizedExpectDeclarations.extractFirDeclarations()
-            }
-            serializeSingleFirFile(
-                firFile,
-                components.session,
-                components.scopeSession,
-                actualizedExpectDeclarations,
-                FirKLibSerializerExtension(
-                    components.session, metadataVersion,
-                    ConstValueProviderImpl(components),
-                    allowErrorTypes = false, exportKDoc = false,
-                    components.annotationsFromPluginRegistrar.createMetadataAnnotationsProvider()
-                ),
-                configuration.languageVersionSettings,
-            )
-        }
-        return result
-    }
-}
-
-fun ModuleCompilerAnalyzedOutput.convertToJsIr(
-    testServices: TestServices,
-    module: TestModule,
-    configuration: CompilerConfiguration,
-    diagnosticReporter: DiagnosticReporter,
-    commonMemberStorage: Fir2IrCommonMemberStorage,
-    irBuiltIns: IrBuiltInsOverFir?
-): Fir2IrResult {
-    // TODO: consider avoiding repeated libraries resolution
         val libraries = resolveLibraries(configuration, getAllJsDependenciesPaths(module, testServices))
         val (dependencies, builtIns) = loadResolvedLibraries(libraries, configuration.languageVersionSettings, testServices)
 
@@ -171,18 +92,56 @@ fun ModuleCompilerAnalyzedOutput.convertToJsIr(
             useIrFakeOverrideBuilder = module.shouldUseIrFakeOverrideBuilderInConvertToIr()
         )
 
-    return convertToIr(
+        val fir2irResult = inputArtifact.toFirResult().convertToIrAndActualize(
             Fir2IrExtensions.Default,
             fir2IrConfiguration,
-        commonMemberStorage,
+            module.irGenerationExtensions(testServices),
-        irBuiltIns,
+            IdSignatureDescriptor(JsManglerDesc),
             JsManglerIr,
+            FirJsKotlinMangler(),
             Fir2IrVisibilityConverter.Default,
             builtIns ?: DefaultBuiltIns.Instance, // TODO: consider passing externally,
             ::IrTypeSystemContextImpl
-    ).also {
+        ) { firPart, irPart ->
+            sourceFiles.addAll(firPart.fir.mapNotNull { it.sourceFile })
+            for (firFile in firPart.fir) {
+                firFilesAndComponentsBySourceFile[firFile.sourceFile!!] = firFile to irPart.components
+            }
+        }.also {
             (it.irModuleFragment.descriptor as? FirModuleDescriptor)?.let { it.allDependencyModules = dependencies }
         }
+
+        val metadataVersion = configuration.metadataVersion(module.languageVersionSettings.languageVersion)
+
+        return IrBackendInput.JsIrBackendInput(
+            fir2irResult.irModuleFragment,
+            fir2irResult.pluginContext,
+            sourceFiles,
+            configuration.incrementalDataProvider?.getSerializedData(sourceFiles) ?: emptyList(),
+            diagnosticReporter = diagnosticReporter,
+            hasErrors = inputArtifact.hasErrors,
+            descriptorMangler = fir2irResult.components.symbolTable.signaturer.mangler,
+            irMangler = irMangler,
+            firMangler = fir2irResult.components.signatureComposer.mangler,
+        ) { file ->
+            val (firFile, components) = firFilesAndComponentsBySourceFile[file]
+                ?: error("cannot find FIR file by source file ${file.name} (${file.path})")
+            val actualizedExpectDeclarations = fir2irResult.irActualizedResult?.actualizedExpectDeclarations?.extractFirDeclarations()
+            serializeSingleFirFile(
+                firFile,
+                components.session,
+                components.scopeSession,
+                actualizedExpectDeclarations,
+                FirKLibSerializerExtension(
+                    components.session, metadataVersion,
+                    ConstValueProviderImpl(components),
+                    allowErrorTypes = false, exportKDoc = false,
+                    components.annotationsFromPluginRegistrar.createMetadataAnnotationsProvider()
+                ),
+                configuration.languageVersionSettings,
+            )
+        }
+    }
 }
 
 private fun loadResolvedLibraries(
@@ -216,3 +175,14 @@ private fun loadResolvedLibraries(
         }
     } to builtInsModule
 }
+
+fun TestModule.irGenerationExtensions(testServices: TestServices): Collection<IrGenerationExtension> {
+    return IrGenerationExtension.getInstances(testServices.compilerConfigurationProvider.getProject(this))
+}
+
+fun FirOutputArtifact.toFirResult(): FirResult {
+    val outputs = partsForDependsOnModules.map {
+        ModuleCompilerAnalyzedOutput(it.session, it.firAnalyzerFacade.scopeSession, it.firFiles.values.toList())
+    }
+    return FirResult(outputs)
+}

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

@@ -20,14 +20,12 @@ import org.jetbrains.kotlin.constant.EvaluatedConstTracker
 import org.jetbrains.kotlin.container.get
 import org.jetbrains.kotlin.diagnostics.DiagnosticReporterFactory
 import org.jetbrains.kotlin.fir.backend.Fir2IrCommonMemberStorage
-import org.jetbrains.kotlin.fir.backend.Fir2IrComponents
 import org.jetbrains.kotlin.fir.backend.Fir2IrConfiguration
-import org.jetbrains.kotlin.fir.backend.IrBuiltInsOverFir
 import org.jetbrains.kotlin.fir.backend.jvm.*
+import org.jetbrains.kotlin.fir.pipeline.convertToIrAndActualize
 import org.jetbrains.kotlin.fir.pipeline.signatureComposerForJvmFir2Ir
 import org.jetbrains.kotlin.fir.psi
 import org.jetbrains.kotlin.ir.backend.jvm.serialization.JvmIrMangler
-import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.resolve.CompilerEnvironment
 import org.jetbrains.kotlin.resolve.lazy.declarations.FileBasedDeclarationProviderFactory
@@ -86,17 +84,11 @@ class Fir2IrJvmResultsConverter(
 
         val phaseConfig = configuration.get(CLIConfigurationKeys.PHASE_CONFIG)
 
-        val dependentIrParts = mutableListOf<IrModuleFragment>()
-        lateinit var backendInput: JvmIrCodegenFactory.JvmIrBackendInput
-        lateinit var mainModuleComponents: Fir2IrComponents
-
         val generateSignatures = compilerConfigurationProvider.getCompilerConfiguration(module)
             .getBoolean(JVMConfigurationKeys.LINK_VIA_SIGNATURES)
         val commonMemberStorage = Fir2IrCommonMemberStorage(signatureComposerForJvmFir2Ir(generateSignatures), FirJvmKotlinMangler())
-        var irBuiltIns: IrBuiltInsOverFir? = null
         val diagnosticReporter = DiagnosticReporterFactory.createReporter()
 
-        for ((index, firOutputPart) in inputArtifact.partsForDependsOnModules.withIndex()) {
         val compilerConfiguration = compilerConfigurationProvider.getCompilerConfiguration(module)
         val fir2IrConfiguration = Fir2IrConfiguration(
             languageVersionSettings = module.languageVersionSettings,
@@ -109,34 +101,29 @@ class Fir2IrJvmResultsConverter(
             allowNonCachedDeclarations = false,
             useIrFakeOverrideBuilder = module.shouldUseIrFakeOverrideBuilderInConvertToIr(),
         )
-            val (irModuleFragment, components, pluginContext) = firOutputPart.firAnalyzerFacade.result.outputs.single().convertToIr(
+
+        val fir2irResult = inputArtifact.toFirResult().convertToIrAndActualize(
             fir2IrExtensions,
             fir2IrConfiguration,
-                commonMemberStorage,
+            module.irGenerationExtensions(testServices),
-                irBuiltIns,
+            signatureComposerForJvmFir2Ir(generateSignatures),
             irMangler,
+            FirJvmKotlinMangler(),
             FirJvmVisibilityConverter,
             DefaultBuiltIns.Instance,
-                typeContextProvider = ::JvmIrTypeSystemContext,
+            ::JvmIrTypeSystemContext
         )
-            irBuiltIns = components.irBuiltIns
 
-            if (index < inputArtifact.partsForDependsOnModules.size - 1) {
+        val backendInput = JvmIrCodegenFactory.JvmIrBackendInput(
-                dependentIrParts.add(irModuleFragment)
+            fir2irResult.irModuleFragment,
-            } else {
+            fir2irResult.components.symbolTable,
-                mainModuleComponents = components
-                backendInput = JvmIrCodegenFactory.JvmIrBackendInput(
-                    irModuleFragment,
-                    components.symbolTable,
             phaseConfig,
-                    components.irProviders,
+            fir2irResult.components.irProviders,
             fir2IrExtensions,
-                    FirJvmBackendExtension(components, actualizedExpectDeclarations = null),
+            FirJvmBackendExtension(fir2irResult.components, actualizedExpectDeclarations = null),
-                    pluginContext,
+            fir2irResult.pluginContext,
             notifyCodegenStart = {},
         )
-            }
-        }
 
         val codegenFactory = JvmIrCodegenFactory(configuration, phaseConfig)
         val generationState = GenerationState.Builder(
@@ -145,12 +132,12 @@ class Fir2IrJvmResultsConverter(
         ).isIrBackend(
             true
         ).jvmBackendClassResolver(
-            FirJvmBackendClassResolver(mainModuleComponents)
+            FirJvmBackendClassResolver(fir2irResult.components)
         ).diagnosticReporter(
             diagnosticReporter
         ).build()
 
-        val result = IrBackendInput.JvmIrBackendInput(
+        return IrBackendInput.JvmIrBackendInput(
             generationState,
             codegenFactory,
             backendInput,
@@ -159,7 +146,5 @@ class Fir2IrJvmResultsConverter(
             irMangler = irMangler,
             firMangler = commonMemberStorage.firSignatureComposer.mangler,
         )
-
-        return result
     }
 }

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

@@ -6,25 +6,21 @@
 package org.jetbrains.kotlin.test.frontend.fir
 
 import org.jetbrains.kotlin.KtSourceFile
-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.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
-import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
 import org.jetbrains.kotlin.diagnostics.DiagnosticReporterFactory
 import org.jetbrains.kotlin.fir.backend.*
 import org.jetbrains.kotlin.fir.backend.js.FirJsKotlinMangler
-import org.jetbrains.kotlin.fir.declarations.FirDeclaration
 import org.jetbrains.kotlin.fir.declarations.FirFile
 import org.jetbrains.kotlin.fir.descriptors.FirModuleDescriptor
-import org.jetbrains.kotlin.fir.pipeline.ModuleCompilerAnalyzedOutput
+import org.jetbrains.kotlin.fir.pipeline.convertToIrAndActualize
 import org.jetbrains.kotlin.fir.serialization.FirKLibSerializerExtension
 import org.jetbrains.kotlin.fir.serialization.serializeSingleFirFile
 import org.jetbrains.kotlin.incremental.components.LookupTracker
@@ -33,7 +29,6 @@ import org.jetbrains.kotlin.ir.backend.js.getSerializedData
 import org.jetbrains.kotlin.ir.backend.js.incrementalDataProvider
 import org.jetbrains.kotlin.ir.backend.js.lower.serialization.ir.JsManglerDesc
 import org.jetbrains.kotlin.ir.backend.js.lower.serialization.ir.JsManglerIr
-import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.library.metadata.resolver.KotlinResolvedLibrary
 import org.jetbrains.kotlin.library.unresolvedDependencies
@@ -74,87 +69,11 @@ class Fir2IrWasmResultsConverter(
     ): IrBackendInput {
         val configuration = testServices.compilerConfigurationProvider.getCompilerConfiguration(module)
 
-        lateinit var mainIrPart: IrModuleFragment
-        val dependentIrParts = mutableListOf<IrModuleFragment>()
         val sourceFiles = mutableListOf<KtSourceFile>()
         val firFilesAndComponentsBySourceFile = mutableMapOf<KtSourceFile, Pair<FirFile, Fir2IrComponents>>()
-        lateinit var mainPluginContext: IrPluginContext
-        var irBuiltIns: IrBuiltInsOverFir? = null
 
-        val commonMemberStorage = Fir2IrCommonMemberStorage(IdSignatureDescriptor(JsManglerDesc), FirJsKotlinMangler())
         val diagnosticReporter = DiagnosticReporterFactory.createReporter()
 
-        for ((index, part) in inputArtifact.partsForDependsOnModules.withIndex()) {
-            val (irModuleFragment, components, pluginContext) =
-                part.firAnalyzerFacade.result.outputs.single().convertToWasmIr(
-                    testServices,
-                    module,
-                    configuration,
-                    diagnosticReporter,
-                    commonMemberStorage,
-                    irBuiltIns,
-                )
-            irBuiltIns = components.irBuiltIns
-            mainPluginContext = pluginContext
-
-            if (index < inputArtifact.partsForDependsOnModules.size - 1) {
-                dependentIrParts.add(irModuleFragment)
-            } else {
-                mainIrPart = irModuleFragment
-            }
-
-            sourceFiles.addAll(part.firFiles.mapNotNull { it.value.sourceFile })
-
-            for (firFile in part.firFiles.values) {
-                firFilesAndComponentsBySourceFile[firFile.sourceFile!!] = firFile to components
-            }
-        }
-
-        val metadataVersion = configuration.metadataVersion(module.languageVersionSettings.languageVersion)
-
-        var actualizedExpectDeclarations: Set<FirDeclaration>? = null
-
-        return IrBackendInput.WasmBackendInput(
-            mainIrPart,
-            mainPluginContext,
-            sourceFiles,
-            configuration.incrementalDataProvider?.getSerializedData(sourceFiles) ?: emptyList(),
-            diagnosticReporter = diagnosticReporter,
-            hasErrors = inputArtifact.hasErrors,
-            descriptorMangler = commonMemberStorage.symbolTable.signaturer.mangler,
-            irMangler = JsManglerIr,
-            firMangler = commonMemberStorage.firSignatureComposer.mangler,
-        ) { file, irActualizedResult ->
-            val (firFile, components) = firFilesAndComponentsBySourceFile[file]
-                ?: error("cannot find FIR file by source file ${file.name} (${file.path})")
-            if (actualizedExpectDeclarations == null && irActualizedResult != null) {
-                actualizedExpectDeclarations = irActualizedResult.actualizedExpectDeclarations.extractFirDeclarations()
-            }
-            serializeSingleFirFile(
-                firFile,
-                components.session,
-                components.scopeSession,
-                actualizedExpectDeclarations,
-                FirKLibSerializerExtension(
-                    components.session, metadataVersion,
-                    ConstValueProviderImpl(components),
-                    allowErrorTypes = false, exportKDoc = false,
-                    additionalAnnotationsProvider = null,
-                ),
-                configuration.languageVersionSettings,
-            )
-        }
-    }
-}
-
-fun ModuleCompilerAnalyzedOutput.convertToWasmIr(
-    testServices: TestServices,
-    module: TestModule,
-    configuration: CompilerConfiguration,
-    diagnosticReporter: DiagnosticReporter,
-    commonMemberStorage: Fir2IrCommonMemberStorage,
-    irBuiltIns: IrBuiltInsOverFir?
-): Fir2IrResult {
         // TODO: consider avoiding repeated libraries resolution
         val libraries = resolveWasmLibraries(module, testServices, configuration)
         val (dependencies, builtIns) = loadResolvedLibraries(libraries, configuration.languageVersionSettings, testServices)
@@ -171,18 +90,59 @@ fun ModuleCompilerAnalyzedOutput.convertToWasmIr(
             useIrFakeOverrideBuilder = module.shouldUseIrFakeOverrideBuilderInConvertToIr(),
         )
 
-    return convertToIr(
+        val fir2irResult = inputArtifact.toFirResult().convertToIrAndActualize(
             Fir2IrExtensions.Default,
             fir2IrConfiguration,
-        commonMemberStorage,
+            module.irGenerationExtensions(testServices),
-        irBuiltIns,
+            IdSignatureDescriptor(JsManglerDesc),
             JsManglerIr,
+            FirJsKotlinMangler(),
             Fir2IrVisibilityConverter.Default,
-        builtIns ?: DefaultBuiltIns.Instance, // TODO: consider passing externally
+            builtIns ?: DefaultBuiltIns.Instance, // TODO: consider passing externally,
-        typeContextProvider = ::IrTypeSystemContextImpl,
+            ::IrTypeSystemContextImpl
-    ).also {
+        ) { firPart, irPart ->
+            sourceFiles.addAll(firPart.fir.mapNotNull { it.sourceFile })
+            for (firFile in firPart.fir) {
+                firFilesAndComponentsBySourceFile[firFile.sourceFile!!] = firFile to irPart.components
+            }
+        }.also {
             (it.irModuleFragment.descriptor as? FirModuleDescriptor)?.let { it.allDependencyModules = dependencies }
         }
+
+
+        val commonMemberStorage = Fir2IrCommonMemberStorage(IdSignatureDescriptor(JsManglerDesc), FirJsKotlinMangler())
+        val metadataVersion = configuration.metadataVersion(module.languageVersionSettings.languageVersion)
+
+        return IrBackendInput.WasmBackendInput(
+            fir2irResult.irModuleFragment,
+            fir2irResult.pluginContext,
+            sourceFiles,
+            configuration.incrementalDataProvider?.getSerializedData(sourceFiles) ?: emptyList(),
+            diagnosticReporter = diagnosticReporter,
+            hasErrors = inputArtifact.hasErrors,
+            descriptorMangler = commonMemberStorage.symbolTable.signaturer.mangler,
+            irMangler = JsManglerIr,
+            firMangler = commonMemberStorage.firSignatureComposer.mangler,
+        ) { file ->
+            val (firFile, components) = firFilesAndComponentsBySourceFile[file]
+                ?: error("cannot find FIR file by source file ${file.name} (${file.path})")
+
+            val actualizedExpectDeclarations = fir2irResult.irActualizedResult?.actualizedExpectDeclarations?.extractFirDeclarations()
+            serializeSingleFirFile(
+                firFile,
+                components.session,
+                components.scopeSession,
+                actualizedExpectDeclarations,
+                FirKLibSerializerExtension(
+                    components.session, metadataVersion,
+                    ConstValueProviderImpl(components),
+                    allowErrorTypes = false, exportKDoc = false,
+                    additionalAnnotationsProvider = null,
+                ),
+                configuration.languageVersionSettings,
+            )
+        }
+    }
 }
 
 private fun loadResolvedLibraries(

compiler/tests-compiler-utils/tests/org/jetbrains/kotlin/codegen/GenerationUtils.kt

@@ -15,8 +15,6 @@ import org.jetbrains.kotlin.analyzer.AnalysisResult
 import org.jetbrains.kotlin.asJava.finder.JavaElementFinder
 import org.jetbrains.kotlin.backend.jvm.JvmIrCodegenFactory
 import org.jetbrains.kotlin.backend.jvm.JvmIrDeserializerImpl
-import org.jetbrains.kotlin.backend.jvm.JvmIrTypeSystemContext
-import org.jetbrains.kotlin.builtins.DefaultBuiltIns
 import org.jetbrains.kotlin.cli.common.CLIConfigurationKeys
 import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity
 import org.jetbrains.kotlin.cli.common.messages.GroupingMessageCollector
@@ -25,19 +23,17 @@ import org.jetbrains.kotlin.cli.common.output.writeAllTo
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
 import org.jetbrains.kotlin.cli.jvm.compiler.NoScopeRecordCliBindingTrace
 import org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM
+import org.jetbrains.kotlin.cli.jvm.compiler.pipeline.convertToIrAndActualizeForJvm
 import org.jetbrains.kotlin.codegen.state.GenerationState
 import org.jetbrains.kotlin.config.CommonConfigurationKeys
 import org.jetbrains.kotlin.config.CompilerConfiguration
 import org.jetbrains.kotlin.config.JVMConfigurationKeys
-import org.jetbrains.kotlin.config.languageVersionSettings
-import org.jetbrains.kotlin.constant.EvaluatedConstTracker
 import org.jetbrains.kotlin.diagnostics.DiagnosticReporterFactory
 import org.jetbrains.kotlin.fir.FirAnalyzerFacade
 import org.jetbrains.kotlin.fir.FirTestSessionFactoryHelper
-import org.jetbrains.kotlin.fir.backend.Fir2IrCommonMemberStorage
+import org.jetbrains.kotlin.fir.backend.jvm.FirJvmBackendClassResolver
-import org.jetbrains.kotlin.fir.backend.Fir2IrConfiguration
+import org.jetbrains.kotlin.fir.backend.jvm.FirJvmBackendExtension
-import org.jetbrains.kotlin.fir.backend.jvm.*
+import org.jetbrains.kotlin.fir.backend.jvm.JvmFir2IrExtensions
-import org.jetbrains.kotlin.fir.pipeline.signatureComposerForJvmFir2Ir
 import org.jetbrains.kotlin.ir.backend.jvm.jvmResolveLibraries
 import org.jetbrains.kotlin.ir.backend.jvm.serialization.JvmIrMangler
 import org.jetbrains.kotlin.load.kotlin.PackagePartProvider
@@ -118,7 +114,6 @@ object GenerationUtils {
             getPackagePartProvider = packagePartProvider
         )
 
-        val linkViaSignatures = configuration.getBoolean(JVMConfigurationKeys.LINK_VIA_SIGNATURES)
         // TODO: add running checkers and check that it's safe to compile
         val firAnalyzerFacade = FirAnalyzerFacade(
             session,
@@ -129,32 +124,14 @@ object GenerationUtils {
 
         val fir2IrExtensions = JvmFir2IrExtensions(configuration, JvmIrDeserializerImpl(), JvmIrMangler)
         val diagnosticReporter = DiagnosticReporterFactory.createReporter()
-
-        val fir2IrConfiguration = Fir2IrConfiguration(
-            languageVersionSettings = configuration.languageVersionSettings,
-            diagnosticReporter = diagnosticReporter,
-            linkViaSignatures = linkViaSignatures,
-            evaluatedConstTracker = configuration
-                .putIfAbsent(CommonConfigurationKeys.EVALUATED_CONST_TRACKER, EvaluatedConstTracker.create()),
-            inlineConstTracker = configuration[CommonConfigurationKeys.INLINE_CONST_TRACKER],
-            expectActualTracker = configuration[CommonConfigurationKeys.EXPECT_ACTUAL_TRACKER],
-            allowNonCachedDeclarations = false,
-            useIrFakeOverrideBuilder = configuration.getBoolean(CommonConfigurationKeys.USE_IR_FAKE_OVERRIDE_BUILDER),
-        )
-
-        val commonMemberStorage = Fir2IrCommonMemberStorage(signatureComposerForJvmFir2Ir(linkViaSignatures), FirJvmKotlinMangler())
-
         firAnalyzerFacade.runResolution()
-        val (moduleFragment, components, pluginContext) = firAnalyzerFacade.result.outputs.single().convertToIr(
+        val (moduleFragment, components, pluginContext) = firAnalyzerFacade.result.convertToIrAndActualizeForJvm(
             fir2IrExtensions,
-            fir2IrConfiguration,
+            configuration,
-            commonMemberStorage,
+            diagnosticReporter,
-            irBuiltIns = null,
+            irGeneratorExtensions = emptyList()
-            JvmIrMangler,
-            FirJvmVisibilityConverter,
-            DefaultBuiltIns.Instance,
-            ::JvmIrTypeSystemContext
         )
+
         val dummyBindingContext = NoScopeRecordCliBindingTrace().bindingContext
 
         val codegenFactory = JvmIrCodegenFactory(

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

@@ -74,7 +74,7 @@ class FirJsKlibBackendFacade(
                 abiVersion = KotlinAbiVersion.CURRENT, // TODO get from test file data
                 jsOutputName = null
             ) {
-                inputArtifact.serializeSingleFile(it, TODO("Will be fixed in the next commit"))
+                inputArtifact.serializeSingleFile(it)
             }
         }
 

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

@@ -63,7 +63,7 @@ class JsKlibBackendFacade(
                 abiVersion = KotlinAbiVersion.CURRENT, // TODO get from test file data
                 jsOutputName = null
             ) {
-                inputArtifact.serializeSingleFile(it, TODO("Will be fixed in the next commit"))
+                inputArtifact.serializeSingleFile(it)
             }
         }
 

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Fir2Ir.kt

@@ -40,7 +40,9 @@ import org.jetbrains.kotlin.ir.declarations.IrExternalPackageFragment
 import org.jetbrains.kotlin.ir.declarations.IrMemberWithContainerSource
 import org.jetbrains.kotlin.ir.objcinterop.IrObjCOverridabilityCondition
 import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
-import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.util.DelicateSymbolTableApi
+import org.jetbrains.kotlin.ir.util.SymbolTable
+import org.jetbrains.kotlin.ir.util.getPackageFragment
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
 import org.jetbrains.kotlin.library.isNativeStdlib
 import org.jetbrains.kotlin.library.metadata.KlibMetadataFactories
@@ -115,9 +117,9 @@ internal fun PhaseContext.fir2Ir(
             visibilityConverter = Fir2IrVisibilityConverter.Default,
             kotlinBuiltIns = builtInsModule ?: DefaultBuiltIns.Instance,
             actualizerTypeContextProvider = ::IrTypeSystemContextImpl,
-            fir2IrResultPostCompute = {
+            fir2IrResultPostCompute = { _, irOutput ->
                 // it's important to compare manglers before actualization, since IR will be actualized, while FIR won't
-                irModuleFragment.acceptVoid(
+                irOutput.irModuleFragment.acceptVoid(
                         ManglerChecker(
                                 KonanManglerIr,
                                 Ir2FirManglerAdapter(FirNativeKotlinMangler),

native/native.tests/tests/org/jetbrains/kotlin/konan/test/Fir2IrNativeResultsConverter.kt

@@ -5,8 +5,6 @@
 
 package org.jetbrains.kotlin.konan.test
 
-import org.jetbrains.kotlin.KtSourceFile
-import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
 import org.jetbrains.kotlin.backend.common.serialization.metadata.DynamicTypeDeserializer
 import org.jetbrains.kotlin.backend.common.serialization.signature.IdSignatureDescriptor
 import org.jetbrains.kotlin.backend.konan.serialization.KonanManglerDesc
@@ -15,32 +13,27 @@ import org.jetbrains.kotlin.builtins.DefaultBuiltIns
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.builtins.konan.KonanBuiltIns
 import org.jetbrains.kotlin.config.CommonConfigurationKeys
-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
-import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
 import org.jetbrains.kotlin.diagnostics.DiagnosticReporterFactory
-import org.jetbrains.kotlin.fir.backend.*
+import org.jetbrains.kotlin.fir.backend.Fir2IrConfiguration
+import org.jetbrains.kotlin.fir.backend.Fir2IrExtensions
+import org.jetbrains.kotlin.fir.backend.Fir2IrVisibilityConverter
 import org.jetbrains.kotlin.fir.backend.native.FirNativeKotlinMangler
-import org.jetbrains.kotlin.fir.declarations.FirFile
 import org.jetbrains.kotlin.fir.descriptors.FirModuleDescriptor
-import org.jetbrains.kotlin.fir.pipeline.ModuleCompilerAnalyzedOutput
+import org.jetbrains.kotlin.fir.pipeline.convertToIrAndActualize
 import org.jetbrains.kotlin.incremental.components.LookupTracker
-import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
-import org.jetbrains.kotlin.ir.util.KotlinMangler
 import org.jetbrains.kotlin.library.metadata.KlibMetadataFactories
 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.directives.CodegenTestDirectives
-import org.jetbrains.kotlin.test.frontend.fir.FirOutputArtifact
+import org.jetbrains.kotlin.test.frontend.fir.*
-import org.jetbrains.kotlin.test.frontend.fir.getAllNativeDependenciesPaths
-import org.jetbrains.kotlin.test.frontend.fir.resolveLibraries
 import org.jetbrains.kotlin.test.model.BackendKinds
 import org.jetbrains.kotlin.test.model.Frontend2BackendConverter
 import org.jetbrains.kotlin.test.model.FrontendKinds
@@ -74,70 +67,10 @@ class Fir2IrNativeResultsConverter(
     ): IrBackendInput {
         val configuration = testServices.compilerConfigurationProvider.getCompilerConfiguration(module)
 
-        lateinit var mainIrPart: IrModuleFragment
-        val dependentIrParts = mutableListOf<IrModuleFragment>()
-        val sourceFiles = mutableListOf<KtSourceFile>()
-        val firFilesAndComponentsBySourceFile = mutableMapOf<KtSourceFile, Pair<FirFile, Fir2IrComponents>>()
-
-        lateinit var mainPluginContext: IrPluginContext
-        var irBuiltIns: IrBuiltInsOverFir? = null
-
-        val commonMemberStorage = Fir2IrCommonMemberStorage(IdSignatureDescriptor(KonanManglerDesc), FirNativeKotlinMangler)
-        val diagnosticReporter = DiagnosticReporterFactory.createReporter()
-
-        for ((index, part) in inputArtifact.partsForDependsOnModules.withIndex()) {
-            val (irModuleFragment, components, pluginContext) =
-                part.firAnalyzerFacade.result.outputs.single().convertToNativeIr(
-                    testServices,
-                    module,
-                    configuration,
-                    diagnosticReporter,
-                    commonMemberStorage,
-                    irBuiltIns,
-                    KonanManglerIr
-                )
-            irBuiltIns = components.irBuiltIns
-            mainPluginContext = pluginContext
-
-            if (index < inputArtifact.partsForDependsOnModules.size - 1) {
-                dependentIrParts.add(irModuleFragment)
-            } else {
-                mainIrPart = irModuleFragment
-            }
-
-            sourceFiles.addAll(part.firFiles.mapNotNull { it.value.sourceFile })
-
-            for (firFile in part.firFiles.values) {
-                firFilesAndComponentsBySourceFile[firFile.sourceFile!!] = firFile to components
-            }
-        }
-
-        val result = IrBackendInput.NativeBackendInput(
-            mainIrPart,
-            mainPluginContext,
-            diagnosticReporter = diagnosticReporter,
-            descriptorMangler = commonMemberStorage.symbolTable.signaturer.mangler,
-            irMangler = KonanManglerIr,
-            firMangler = commonMemberStorage.firSignatureComposer.mangler,
-        )
-
-        return result
-    }
-}
-
-fun ModuleCompilerAnalyzedOutput.convertToNativeIr(
-    testServices: TestServices,
-    module: TestModule,
-    configuration: CompilerConfiguration,
-    diagnosticReporter: DiagnosticReporter,
-    commonMemberStorage: Fir2IrCommonMemberStorage,
-    irBuiltIns: IrBuiltInsOverFir?,
-    irMangler: KotlinMangler.IrMangler,
-): Fir2IrResult {
-    // TODO: consider avoiding repeated libraries resolution
         val libraries = resolveLibraries(configuration, getAllNativeDependenciesPaths(module, testServices))
         val (dependencies, builtIns) = loadResolvedLibraries(libraries, configuration.languageVersionSettings, testServices)
 
+        val diagnosticReporter = DiagnosticReporterFactory.createReporter()
         val fir2IrConfiguration = Fir2IrConfiguration(
             languageVersionSettings = configuration.languageVersionSettings,
             diagnosticReporter = diagnosticReporter,
@@ -149,18 +82,29 @@ fun ModuleCompilerAnalyzedOutput.convertToNativeIr(
             expectActualTracker = configuration[CommonConfigurationKeys.EXPECT_ACTUAL_TRACKER],
             useIrFakeOverrideBuilder = configuration.getBoolean(CommonConfigurationKeys.USE_IR_FAKE_OVERRIDE_BUILDER),
         )
-    return convertToIr(
+        val fir2irResult = inputArtifact.toFirResult().convertToIrAndActualize(
             Fir2IrExtensions.Default,
             fir2IrConfiguration,
-        commonMemberStorage,
+            module.irGenerationExtensions(testServices),
-        irBuiltIns,
+            IdSignatureDescriptor(KonanManglerDesc),
-        irMangler,
+            KonanManglerIr,
+            FirNativeKotlinMangler,
             Fir2IrVisibilityConverter.Default,
             builtIns ?: DefaultBuiltIns.Instance, // TODO: consider passing externally,
             ::IrTypeSystemContextImpl
         ).also {
             (it.irModuleFragment.descriptor as? FirModuleDescriptor)?.let { it.allDependencyModules = dependencies }
         }
+
+        return IrBackendInput.NativeBackendInput(
+            fir2irResult.irModuleFragment,
+            fir2irResult.pluginContext,
+            diagnosticReporter = diagnosticReporter,
+            descriptorMangler = fir2irResult.components.symbolTable.signaturer.mangler,
+            irMangler = KonanManglerIr,
+            firMangler = fir2irResult.components.signatureComposer.mangler,
+        )
+    }
 }
 
 internal val KlibFactories = KlibMetadataFactories(::KonanBuiltIns, DynamicTypeDeserializer)
@@ -196,4 +140,3 @@ private fun loadResolvedLibraries(
         }
     } to builtInsModule
 }
-

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

@@ -74,7 +74,7 @@ class FirWasmKlibBackendFacade(
                 abiVersion = KotlinAbiVersion.CURRENT, // TODO get from test file data
                 jsOutputName = null
             ) {
-                inputArtifact.serializeSingleFile(it, TODO("Will be fixed in the next commit"))
+                inputArtifact.serializeSingleFile(it)
             }
         }