[FIR2IR] Extract logic of IR declarations generation into separate component. Part 3

Move caching of created IrFunctions back to Fir2IrDeclarationStorage
Fix all call-sites

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt

@@ -429,17 +429,50 @@ class Fir2IrDeclarationStorage(
     fun originalDeclarationForDelegated(irDeclaration: IrDeclaration): FirDeclaration? = delegatedReverseCache[irDeclaration]
 
     fun getOrCreateIrFunction(
-        function: FirSimpleFunction,
+        function: FirFunction,
         irParent: IrDeclarationParent?,
+        predefinedOrigin: IrDeclarationOrigin? = null,
         isLocal: Boolean = false,
+        fakeOverrideOwnerLookupTag: ConeClassLikeLookupTag? = null
     ): IrSimpleFunction {
         getCachedIrFunction(function)?.let { return it }
-        return callablesGenerator.createIrFunction(
+        return createAndCacheIrFunction(function, irParent, predefinedOrigin, isLocal, fakeOverrideOwnerLookupTag)
+    }
+
+    private fun createAndCacheIrFunction(
+        function: FirFunction,
+        irParent: IrDeclarationParent?,
+        predefinedOrigin: IrDeclarationOrigin? = null,
+        isLocal: Boolean = false,
+        fakeOverrideOwnerLookupTag: ConeClassLikeLookupTag? = null
+    ): IrSimpleFunction {
+        val irFunction = callablesGenerator.createIrFunction(
             function,
             irParent,
+            predefinedOrigin,
             isLocal = isLocal,
-            fakeOverrideOwnerLookupTag = function.containingClassLookupTag()
+            fakeOverrideOwnerLookupTag = fakeOverrideOwnerLookupTag
         )
+        when {
+            irFunction.visibility == DescriptorVisibilities.LOCAL -> {
+                localStorage.putLocalFunction(function, irFunction)
+            }
+
+            function.isFakeOverride(fakeOverrideOwnerLookupTag) -> {
+                val originalFunction = function.unwrapFakeOverrides()
+                val key = FakeOverrideIdentifier(
+                    originalFunction.symbol,
+                    fakeOverrideOwnerLookupTag ?: function.containingClassLookupTag()!!
+                )
+                irFakeOverridesForFirFakeOverrideMap[key] = irFunction
+            }
+
+            else -> {
+                functionCache[function] = irFunction
+            }
+        }
+
+        return irFunction
     }
 
     fun getCachedIrAnonymousInitializer(anonymousInitializer: FirAnonymousInitializer): IrAnonymousInitializer? =
@@ -715,7 +748,7 @@ class Fir2IrDeclarationStorage(
                 val irParent = findIrParent(fir)
                 val parentOrigin = (irParent as? IrDeclaration)?.origin ?: IrDeclarationOrigin.DEFINED
                 val declarationOrigin = computeDeclarationOrigin(firFunctionSymbol, parentOrigin)
-                callablesGenerator.createIrFunction(fir, irParent, predefinedOrigin = declarationOrigin).symbol
+                createAndCacheIrFunction(fir, irParent, predefinedOrigin = declarationOrigin).symbol
             }
             is FirSimpleFunction -> {
                 val unmatchedOwner = fakeOverrideOwnerLookupTag != firFunctionSymbol.containingClassLookupTag()
@@ -727,7 +760,7 @@ class Fir2IrDeclarationStorage(
                     fakeOverrideOwnerLookupTag,
                     getCachedIrDeclaration = ::getCachedIrFunction,
                     createIrDeclaration = { parent, origin ->
-                        callablesGenerator.createIrFunction(
+                        createAndCacheIrFunction(
                             fir, parent,
                             predefinedOrigin = origin,
                             fakeOverrideOwnerLookupTag = fakeOverrideOwnerLookupTag,

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrVisitor.kt

@@ -396,7 +396,7 @@ class Fir2IrVisitor(
 
     override fun visitSimpleFunction(simpleFunction: FirSimpleFunction, data: Any?): IrElement = whileAnalysing(session, simpleFunction) {
         val irFunction = if (simpleFunction.visibility == Visibilities.Local) {
-            callablesGenerator.createIrFunction(
+            declarationStorage.getOrCreateIrFunction(
                 simpleFunction, irParent = conversionScope.parent(), predefinedOrigin = IrDeclarationOrigin.LOCAL_FUNCTION, isLocal = true
             )
         } else {
@@ -418,7 +418,7 @@ class Fir2IrVisitor(
         data: Any?
     ): IrElement = whileAnalysing(session, anonymousFunction) {
         return anonymousFunction.convertWithOffsets { startOffset, endOffset ->
-            val irFunction = callablesGenerator.createIrFunction(
+            val irFunction = declarationStorage.getOrCreateIrFunction(
                 anonymousFunction,
                 irParent = conversionScope.parent(),
                 predefinedOrigin = IrDeclarationOrigin.LOCAL_FUNCTION,

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/DelegatedMemberGenerator.kt

@@ -205,11 +205,10 @@ class DelegatedMemberGenerator(private val components: Fir2IrComponents) : Fir2I
         firSubClass: FirClass,
         delegateOverride: FirSimpleFunction
     ): IrSimpleFunction {
-        val delegateFunction =
-            callablesGenerator.createIrFunction(
-                delegateOverride, subClass, predefinedOrigin = IrDeclarationOrigin.DELEGATED_MEMBER,
-                fakeOverrideOwnerLookupTag = firSubClass.symbol.toLookupTag()
-            )
+        val delegateFunction = declarationStorage.getOrCreateIrFunction(
+            delegateOverride, subClass, predefinedOrigin = IrDeclarationOrigin.DELEGATED_MEMBER,
+            fakeOverrideOwnerLookupTag = firSubClass.symbol.toLookupTag()
+        )
         val baseSymbols = mutableListOf<FirNamedFunctionSymbol>()
         // the overridden symbols should be collected only after all fake overrides for all superclases are created and bound to their
         // overridden symbols, otherwise in some cases they will be left in inconsistent state leading to the errors in IR

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/FakeOverrideGenerator.kt

@@ -122,7 +122,7 @@ class FakeOverrideGenerator(
             createFakeOverriddenIfNeeded(
                 firClass, irClass, isLocal, functionSymbol,
                 declarationStorage::getCachedIrFunction,
-                callablesGenerator::createIrFunction,
+                declarationStorage::getOrCreateIrFunction,
                 createFakeOverrideSymbol = { firFunction, callableSymbol ->
                     val symbol = FirFakeOverrideGenerator.createSymbolForSubstitutionOverride(callableSymbol, firClass.symbol.classId)
                     FirFakeOverrideGenerator.createSubstitutionOverrideFunction(

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/Fir2IrCallableDeclarationsGenerator.kt

@@ -345,7 +345,6 @@ class Fir2IrCallableDeclarationsGenerator(val components: Fir2IrComponents) : Fi
         }
 
         if (visibility == Visibilities.Local) {
-            localStorage.putLocalFunction(function, created)
             return created
         }
         if (function.symbol.callableId.isKFunctionInvoke()) {
@@ -353,16 +352,6 @@ class Fir2IrCallableDeclarationsGenerator(val components: Fir2IrComponents) : Fi
                 created.overriddenSymbols += declarationStorage.getIrFunctionSymbol(it) as IrSimpleFunctionSymbol
             }
         }
-        if (function.isFakeOverride(fakeOverrideOwnerLookupTag)) {
-            val originalFunction = function.unwrapFakeOverrides()
-            val key = Fir2IrDeclarationStorage.FakeOverrideIdentifier(
-                originalFunction.symbol,
-                fakeOverrideOwnerLookupTag ?: function.containingClassLookupTag()!!
-            )
-            irFakeOverridesForFirFakeOverrideMap[key] = created
-        } else {
-            functionCache[function] = created
-        }
         return created
     }