FIR2IR: fix f/o & delegate overridden symbol generation #KT-52745 Fixed

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

@@ -194,6 +194,10 @@ class DelegatedMemberGenerator(
                     declaration.overriddenSymbols = basePropertySymbols[declaration]?.flatMap {
                         fakeOverrideGenerator.getOverriddenSymbolsInSupertypes(it, superClasses)
                     }?.filter { it.owner != declaration }.orEmpty()
+                    declaration.getter!!.overriddenSymbols = declaration.overriddenSymbols.mapNotNull { it.owner.getter?.symbol }
+                    if (declaration.isVar) {
+                        declaration.setter!!.overriddenSymbols = declaration.overriddenSymbols.mapNotNull { it.owner.setter?.symbol }
+                    }
                 }
                 else -> continue
             }
@@ -301,18 +305,9 @@ class DelegatedMemberGenerator(
         annotationGenerator.generate(delegateProperty, firDelegateProperty)
 
         val getter = delegateProperty.getter!!
-        getter.overriddenSymbols =
-            firDelegateProperty.generateOverriddenAccessorSymbols(
-                firSubClass,
-                isGetter = true
-            )
         annotationGenerator.generate(getter, firDelegateProperty)
         if (delegateProperty.isVar) {
             val setter = delegateProperty.setter!!
-            setter.overriddenSymbols =
-                firDelegateProperty.generateOverriddenAccessorSymbols(
-                    firSubClass, isGetter = false
-                )
             annotationGenerator.generate(setter, firDelegateProperty)
         }
 

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

@@ -391,13 +391,13 @@ class FakeOverrideGenerator(
             declarationStorage.classifierStorage.getIrClassSymbol(overriddenContainingClass.symbol).owner as? IrClass
                 ?: return emptyList()
 
-        return if (overriddenContainingIrClass in superClasses) {
-            // `overridden` was a FIR declaration in some of the supertypes
-            listOf(irProducer(overridden))
-        } else {
-            // There were no FIR declaration in supertypes, but we know that we have fake overrides in some of them
-            superClasses.mapNotNull {
-                declarationStorage.getFakeOverrideInClass(it, overridden.fir)?.let { fakeOverrideInClass ->
+        return superClasses.mapNotNull { superClass ->
+            if (superClass == overriddenContainingIrClass) {
+                // `overridden` was a FIR declaration in some of the supertypes
+                irProducer(overridden)
+            } else {
+                // There were no FIR declaration in supertypes, but we know that we have fake overrides in some of them
+                declarationStorage.getFakeOverrideInClass(superClass, overridden.fir)?.let { fakeOverrideInClass ->
                     @Suppress("UNCHECKED_CAST")
                     irProducer(fakeOverrideInClass.symbol as F)
                 }

compiler/testData/codegen/box/delegation/sealedClass.kt

@@ -1,5 +1,4 @@
 // TARGET_BACKEND: JVM_IR
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_STDLIB
 
 sealed class A : CharSequence {

compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.fir.ir.txt

@@ -16,6 +16,7 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
           INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:B modality:FINAL visibility:public [data] superTypes:[<root>.A; kotlin.CharSequence]'
       FUN DELEGATED_MEMBER name:get visibility:public modality:OPEN <> ($this:<root>.A.B, index:kotlin.Int) returnType:kotlin.Char [operator]
         overridden:
+          public abstract fun get (index: kotlin.Int): kotlin.Char [fake_override,operator] declared in <root>.A
           public abstract fun get (index: kotlin.Int): kotlin.Char [operator] declared in kotlin.CharSequence
         $this: VALUE_PARAMETER name:<this> type:<root>.A.B
         VALUE_PARAMETER name:index index:0 type:kotlin.Int
@@ -27,6 +28,7 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
               index: GET_VAR 'index: kotlin.Int declared in <root>.A.B.get' type=kotlin.Int origin=null
       FUN DELEGATED_MEMBER name:subSequence visibility:public modality:OPEN <> ($this:<root>.A.B, startIndex:kotlin.Int, endIndex:kotlin.Int) returnType:kotlin.CharSequence
         overridden:
+          public abstract fun subSequence (startIndex: kotlin.Int, endIndex: kotlin.Int): kotlin.CharSequence [fake_override] declared in <root>.A
           public abstract fun subSequence (startIndex: kotlin.Int, endIndex: kotlin.Int): kotlin.CharSequence declared in kotlin.CharSequence
         $this: VALUE_PARAMETER name:<this> type:<root>.A.B
         VALUE_PARAMETER name:startIndex index:0 type:kotlin.Int
@@ -40,10 +42,12 @@ FILE fqName:<root> fileName:/delegationInSealed.kt
               endIndex: GET_VAR 'endIndex: kotlin.Int declared in <root>.A.B.subSequence' type=kotlin.Int origin=null
       PROPERTY DELEGATED_MEMBER name:length visibility:public modality:OPEN [val]
         overridden:
+          public abstract length: kotlin.Int [fake_override,val]
           public abstract length: kotlin.Int [val]
         FUN DELEGATED_MEMBER name:<get-length> visibility:public modality:OPEN <> ($this:<root>.A.B) returnType:kotlin.Int
           correspondingProperty: PROPERTY DELEGATED_MEMBER name:length visibility:public modality:OPEN [val]
           overridden:
+            public abstract fun <get-length> (): kotlin.Int [fake_override] declared in <root>.A
             public abstract fun <get-length> (): kotlin.Int declared in kotlin.CharSequence
           $this: VALUE_PARAMETER name:<this> type:<root>.A.B
           BLOCK_BODY

compiler/testData/ir/irText/firProblems/SignatureClash.fir.ir.txt

@@ -92,6 +92,7 @@ FILE fqName:<root> fileName:/SignatureClash.kt
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:DataClass modality:FINAL visibility:public [data] superTypes:[<root>.Derived; <root>.Delegate]'
     FUN DELEGATED_MEMBER name:bar visibility:public modality:OPEN <> ($this:<root>.DataClass) returnType:kotlin.Unit
       overridden:
+        public abstract fun bar (): kotlin.Unit [fake_override] declared in <root>.Derived
         public abstract fun bar (): kotlin.Unit declared in <root>.Delegate
       $this: VALUE_PARAMETER name:<this> type:<root>.DataClass
       BLOCK_BODY