Fir2Ir: pass file data to Fir2IrSignatureComposer

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

@@ -428,8 +428,9 @@ class Fir2IrConverter(
             irGenerationExtensions: Collection<IrGenerationExtension>
         ): Fir2IrResult {
             val moduleDescriptor = FirModuleDescriptor(session)
-            val symbolTable = SymbolTable(signaturer, irFactory)
             val signatureComposer = FirBasedSignatureComposer(mangler)
+            val wrappedSignaturer = WrappedDescriptorSignatureComposer(signaturer, signatureComposer)
+            val symbolTable = SymbolTable(wrappedSignaturer, irFactory)
             val components = Fir2IrComponentsStorage(session, scopeSession, symbolTable, irFactory, signatureComposer, fir2IrExtensions)
             val converter = Fir2IrConverter(moduleDescriptor, components)
 
@@ -532,3 +533,14 @@ class Fir2IrConverter(
         }
     }
 }
+
+private class WrappedDescriptorSignatureComposer(
+    private val delegate: IdSignatureComposer,
+    private val firComposer: Fir2IrSignatureComposer
+) : IdSignatureComposer by delegate {
+    override fun withFileSignature(fileSignature: IdSignature.FileSignature, body: () -> Unit) {
+        firComposer.withFileSignature(fileSignature) {
+            delegate.withFileSignature(fileSignature, body)
+        }
+    }
+}

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrSignatureComposer.kt

@@ -7,10 +7,13 @@ package org.jetbrains.kotlin.fir.backend
 
 import org.jetbrains.kotlin.fir.declarations.FirDeclaration
 import org.jetbrains.kotlin.fir.declarations.FirProperty
+import org.jetbrains.kotlin.fir.signaturer.FirMangler
 import org.jetbrains.kotlin.fir.symbols.ConeClassLikeLookupTag
 import org.jetbrains.kotlin.ir.util.IdSignature
 
 interface Fir2IrSignatureComposer {
+    val mangler: FirMangler
     fun composeSignature(declaration: FirDeclaration, containingClass: ConeClassLikeLookupTag? = null): IdSignature?
     fun composeAccessorSignature(property: FirProperty, isSetter: Boolean, containingClass: ConeClassLikeLookupTag? = null): IdSignature?
+    fun withFileSignature(sig: IdSignature.FileSignature, body: () -> Unit)
 }

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/signaturer/FirBasedSignatureComposer.kt

@@ -17,7 +17,15 @@ import org.jetbrains.kotlin.fir.visitors.FirVisitor
 import org.jetbrains.kotlin.ir.util.IdSignature
 
 @NoMutableState
-class FirBasedSignatureComposer(private val mangler: FirMangler) : Fir2IrSignatureComposer {
+class FirBasedSignatureComposer(override val mangler: FirMangler) : Fir2IrSignatureComposer {
+    var fileSignature: IdSignature.FileSignature? = null
+
+    override fun withFileSignature(sig: IdSignature.FileSignature, body: () -> Unit) {
+        fileSignature = sig
+        body()
+        fileSignature = null
+    }
+
     inner class SignatureBuilder : FirVisitor<Unit, Any?>() {
         var hashId: Long? = null
         var mask = 0L