FIR2IR entry points: don't create JvmDescriptorMangler if not needed

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

@@ -6,7 +6,6 @@
 package org.jetbrains.kotlin.fir.pipeline
 
 import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
-import org.jetbrains.kotlin.backend.jvm.serialization.JvmIdSignatureDescriptor
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.backend.Fir2IrConverter
 import org.jetbrains.kotlin.fir.backend.Fir2IrExtensions
@@ -20,7 +19,6 @@ import org.jetbrains.kotlin.fir.moduleData
 import org.jetbrains.kotlin.fir.resolve.ScopeSession
 import org.jetbrains.kotlin.fir.resolve.providers.firProvider
 import org.jetbrains.kotlin.fir.resolve.providers.impl.FirProviderImpl
-import org.jetbrains.kotlin.ir.backend.jvm.serialization.JvmDescriptorMangler
 import org.jetbrains.kotlin.ir.backend.jvm.serialization.JvmIrMangler
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 
@@ -30,22 +28,17 @@ fun FirSession.convertToIr(
     fir2IrExtensions: Fir2IrExtensions,
     irGeneratorExtensions: Collection<IrGenerationExtension>
 ): Fir2IrResult {
-    val mangler = JvmDescriptorMangler(null)
-    val signaturer = JvmIdSignatureDescriptor(mangler)
-
     val commonFirFiles = moduleData.dependsOnDependencies
         .map { it.session }
         .filter { it.kind == FirSession.Kind.Source }
         .flatMap { (it.firProvider as FirProviderImpl).getAllFirFiles() }
 
-    return Fir2IrConverter.createModuleFragment(
+    return Fir2IrConverter.createModuleFragmentWithoutSignatures(
         this, scopeSession, firFiles + commonFirFiles,
-        languageVersionSettings, signaturer,
-        fir2IrExtensions,
-        FirJvmKotlinMangler(this), JvmIrMangler, IrFactoryImpl,
-        FirJvmVisibilityConverter,
+        languageVersionSettings, fir2IrExtensions,
+        FirJvmKotlinMangler(this),
+        JvmIrMangler, IrFactoryImpl, FirJvmVisibilityConverter,
         Fir2IrJvmSpecialAnnotationSymbolProvider(),
-        irGeneratorExtensions,
-        generateSignatures = false
+        irGeneratorExtensions
     )
 }

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrConverter.kt

@@ -10,6 +10,9 @@ import org.jetbrains.kotlin.KtSourceFileLinesMappingFromLineStartOffsets
 import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
 import org.jetbrains.kotlin.config.AnalysisFlags
 import org.jetbrains.kotlin.config.LanguageVersionSettings
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.backend.generators.*
 import org.jetbrains.kotlin.fir.backend.generators.DataClassMembersGenerator
@@ -394,7 +397,7 @@ class Fir2IrConverter(
             }
         }
 
-        fun createModuleFragment(
+        fun createModuleFragmentWithSignaturesIfNeeded(
             session: FirSession,
             scopeSession: ScopeSession,
             firFiles: List<FirFile>,
@@ -409,10 +412,64 @@ class Fir2IrConverter(
             irGenerationExtensions: Collection<IrGenerationExtension>,
             generateSignatures: Boolean
         ): Fir2IrResult {
-            val moduleDescriptor = FirModuleDescriptor(session)
+            if (!generateSignatures) {
+                return createModuleFragmentWithoutSignatures(
+                    session, scopeSession, firFiles, languageVersionSettings,
+                    fir2IrExtensions, mangler, irMangler, irFactory,
+                    visibilityConverter, specialSymbolProvider, irGenerationExtensions
+                )
+            }
             val signatureComposer = FirBasedSignatureComposer(mangler)
             val wrappedSignaturer = WrappedDescriptorSignatureComposer(signaturer, signatureComposer)
             val symbolTable = SymbolTable(wrappedSignaturer, irFactory)
+            return createModuleFragmentWithSymbolTable(
+                session, scopeSession, firFiles, languageVersionSettings,
+                fir2IrExtensions, irMangler, irFactory, visibilityConverter,
+                specialSymbolProvider, irGenerationExtensions, signatureComposer,
+                symbolTable, generateSignatures = true
+            )
+        }
+
+        fun createModuleFragmentWithoutSignatures(
+            session: FirSession,
+            scopeSession: ScopeSession,
+            firFiles: List<FirFile>,
+            languageVersionSettings: LanguageVersionSettings,
+            fir2IrExtensions: Fir2IrExtensions,
+            mangler: FirMangler,
+            irMangler: KotlinMangler.IrMangler,
+            irFactory: IrFactory,
+            visibilityConverter: Fir2IrVisibilityConverter,
+            specialSymbolProvider: Fir2IrSpecialSymbolProvider,
+            irGenerationExtensions: Collection<IrGenerationExtension>
+        ): Fir2IrResult {
+            val signatureComposer = FirBasedSignatureComposer(mangler)
+            val signaturer = DescriptorSignatureComposerStub()
+            val symbolTable = SymbolTable(signaturer, irFactory)
+            return createModuleFragmentWithSymbolTable(
+                session, scopeSession, firFiles, languageVersionSettings,
+                fir2IrExtensions, irMangler, irFactory, visibilityConverter,
+                specialSymbolProvider, irGenerationExtensions, signatureComposer,
+                symbolTable, generateSignatures = false
+            )
+        }
+
+        private fun createModuleFragmentWithSymbolTable(
+            session: FirSession,
+            scopeSession: ScopeSession,
+            firFiles: List<FirFile>,
+            languageVersionSettings: LanguageVersionSettings,
+            fir2IrExtensions: Fir2IrExtensions,
+            irMangler: KotlinMangler.IrMangler,
+            irFactory: IrFactory,
+            visibilityConverter: Fir2IrVisibilityConverter,
+            specialSymbolProvider: Fir2IrSpecialSymbolProvider,
+            irGenerationExtensions: Collection<IrGenerationExtension>,
+            signatureComposer: FirBasedSignatureComposer,
+            symbolTable: SymbolTable,
+            generateSignatures: Boolean
+        ): Fir2IrResult {
+            val moduleDescriptor = FirModuleDescriptor(session)
             val components = Fir2IrComponentsStorage(
                 session, scopeSession, symbolTable, irFactory, signatureComposer, fir2IrExtensions, generateSignatures
             )
@@ -475,3 +532,25 @@ private class WrappedDescriptorSignatureComposer(
         }
     }
 }
+
+private class DescriptorSignatureComposerStub : IdSignatureComposer {
+    override fun composeSignature(descriptor: DeclarationDescriptor): IdSignature? {
+        return null
+    }
+
+    override fun composeEnumEntrySignature(descriptor: ClassDescriptor): IdSignature? {
+        return null
+    }
+
+    override fun composeFieldSignature(descriptor: PropertyDescriptor): IdSignature? {
+        return null
+    }
+
+    override fun composeAnonInitSignature(descriptor: ClassDescriptor): IdSignature? {
+        return null
+    }
+
+    override fun withFileSignature(fileSignature: IdSignature.FileSignature, body: () -> Unit) {
+        body()
+    }
+}

compiler/incremental-compilation-impl/src/org/jetbrains/kotlin/incremental/IncrementalFirJvmCompilerRunner.kt

@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.KtSourceFile
 import org.jetbrains.kotlin.KtVirtualFileSourceFile
 import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
 import org.jetbrains.kotlin.backend.jvm.JvmIrDeserializerImpl
-import org.jetbrains.kotlin.backend.jvm.serialization.JvmIdSignatureDescriptor
 import org.jetbrains.kotlin.build.DEFAULT_KOTLIN_SOURCE_FILES_EXTENSIONS
 import org.jetbrains.kotlin.build.report.BuildReporter
 import org.jetbrains.kotlin.cli.common.CLIConfigurationKeys
@@ -55,7 +54,6 @@ import org.jetbrains.kotlin.incremental.components.ExpectActualTracker
 import org.jetbrains.kotlin.incremental.components.InlineConstTracker
 import org.jetbrains.kotlin.incremental.components.LookupTracker
 import org.jetbrains.kotlin.incremental.multiproject.ModulesApiHistory
-import org.jetbrains.kotlin.ir.backend.jvm.serialization.JvmDescriptorMangler
 import org.jetbrains.kotlin.ir.backend.jvm.serialization.JvmIrMangler
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.util.IrMessageLogger
@@ -272,20 +270,17 @@ class IncrementalFirJvmCompilerRunner(
             val extensions = JvmFir2IrExtensions(configuration, JvmIrDeserializerImpl(), JvmIrMangler)
             val irGenerationExtensions =
                 (projectEnvironment as? VfsBasedProjectEnvironment)?.project?.let { IrGenerationExtension.getInstances(it) }.orEmpty()
-            val signaturer = JvmIdSignatureDescriptor(JvmDescriptorMangler(null))
             val allCommonFirFiles = cycleResult.session.moduleData.dependsOnDependencies
                 .map { it.session }
                 .filter { it.kind == FirSession.Kind.Source }
                 .flatMap { (it.firProvider as FirProviderImpl).getAllFirFiles() }
 
-            val (irModuleFragment, components) = Fir2IrConverter.createModuleFragment(
+            val (irModuleFragment, components) = Fir2IrConverter.createModuleFragmentWithoutSignatures(
                 cycleResult.session, cycleResult.scopeSession, cycleResult.fir + allCommonFirFiles,
-                cycleResult.session.languageVersionSettings, signaturer,
-                extensions, FirJvmKotlinMangler(cycleResult.session), JvmIrMangler, IrFactoryImpl,
-                FirJvmVisibilityConverter,
+                cycleResult.session.languageVersionSettings, extensions,
+                FirJvmKotlinMangler(cycleResult.session), JvmIrMangler, IrFactoryImpl, FirJvmVisibilityConverter,
                 Fir2IrJvmSpecialAnnotationSymbolProvider(),
-                irGenerationExtensions,
-                generateSignatures = false
+                irGenerationExtensions
             )
 
             performanceManager?.notifyIRTranslationFinished()

compiler/tests-compiler-utils/tests/org/jetbrains/kotlin/fir/FirAnalyzerFacade.kt

@@ -111,7 +111,7 @@ class FirAnalyzerFacade(
             .filter { it.kind == FirSession.Kind.Source }
             .flatMap { (it.firProvider as FirProviderImpl).getAllFirFiles() }
 
-        return Fir2IrConverter.createModuleFragment(
+        return Fir2IrConverter.createModuleFragmentWithSignaturesIfNeeded(
             session, _scopeSession!!, firFiles!! + commonFirFiles,
             languageVersionSettings, signaturer,
             fir2IrExtensions,