[IRFakeOverrides] Convert lazy callables overriddens during f/o building

Unfortunately, it's not enough to know direct overriddens
to correctly build fake overrides. This mean, that we need to know
whole overridden tree during the process of building.

It happens automatically for normal classes, but not for lazy classes,
as their overriddens are built separatly.

This commit enforces correct overrddens for lazy classes in hierarhies
at the point, where they should be normally computed.

^KT-65236

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

@@ -19,15 +19,19 @@ import org.jetbrains.kotlin.fir.analysis.checkers.MppCheckerKind
 import org.jetbrains.kotlin.fir.backend.*
 import org.jetbrains.kotlin.fir.backend.jvm.Fir2IrJvmSpecialAnnotationSymbolProvider
 import org.jetbrains.kotlin.fir.declarations.FirFile
+import org.jetbrains.kotlin.fir.lazy.Fir2IrLazyClass
 import org.jetbrains.kotlin.fir.resolve.ScopeSession
 import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.KtDiagnosticReporterWithImplicitIrBasedContext
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.declarations.IrProperty
+import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.declarations.lazy.IrLazyDeclarationBase
 import org.jetbrains.kotlin.ir.overrides.IrFakeOverrideBuilder
+import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
 import org.jetbrains.kotlin.ir.types.getClass
 import org.jetbrains.kotlin.ir.util.KotlinMangler
@@ -117,7 +121,8 @@ fun FirResult.convertToIrAndActualize(
         // actualization separately. This should go away, after useIrFakeOverrideBuilder becomes
         // always enabled
         irActualizer?.actualizeClassifiers()
-        components.fakeOverrideBuilder.buildForAll(allIrModules)
+        val temporaryResolver = SpecialFakeOverrideSymbolsResolver(emptyMap())
+        components.fakeOverrideBuilder.buildForAll(allIrModules, temporaryResolver)
     }
     val expectActualMap = irActualizer?.actualizeCallablesAndMergeModules() ?: emptyMap()
     if (components.configuration.useIrFakeOverrideBuilder) {
@@ -132,15 +137,58 @@ fun FirResult.convertToIrAndActualize(
     return Fir2IrActualizedResult(irModuleFragment, components, pluginContext, actualizationResult)
 }
 
-private fun IrFakeOverrideBuilder.buildForAll(modules: List<IrModuleFragment>) {
+
+private fun resolveOverridenSymbolsInLazyClass(
+    clazz: Fir2IrLazyClass,
+    resolver: SpecialFakeOverrideSymbolsResolver
+) {
+    /*
+     * Eventually, we should be able to process lazy classes with the same code.
+     *
+     * Now we can't do this, because overriding by Java function is not supported correctly in IR builder.
+     * In most cases, nothing need to be done for lazy classes. For other cases, it is
+     * caller responsibility to handle them.
+     *
+     * Super-classes already have processed fake overrides at this moment.
+     * Also, all Fir2IrLazyClass super-classes are always platform classes,
+     * so it's valid to process it with empty expect-actual mapping.
+     *
+     * But this is still a hack, and should be removed within KT-64352
+     */
+    @OptIn(UnsafeDuringIrConstructionAPI::class)
+    for (declaration in clazz.declarations) {
+        when (declaration) {
+            is IrSimpleFunction -> {
+                declaration.overriddenSymbols = declaration.overriddenSymbols.map { resolver.getReferencedSimpleFunction(it) }
+            }
+            is IrProperty -> {
+                declaration.overriddenSymbols = declaration.overriddenSymbols.map { resolver.getReferencedProperty(it) }
+                declaration.getter?.let { getter ->
+                    getter.overriddenSymbols = getter.overriddenSymbols.map { resolver.getReferencedSimpleFunction(it) }
+                }
+                declaration.setter?.let { setter ->
+                    setter.overriddenSymbols = setter.overriddenSymbols.map { resolver.getReferencedSimpleFunction(it) }
+                }
+            }
+        }
+    }
+}
+
+private fun IrFakeOverrideBuilder.buildForAll(
+    modules: List<IrModuleFragment>,
+    resolver: SpecialFakeOverrideSymbolsResolver
+) {
     val builtFakeOverridesClasses = mutableSetOf<IrClass>()
     fun buildFakeOverrides(clazz: IrClass) {
-        if (clazz is IrLazyDeclarationBase) return
         if (!builtFakeOverridesClasses.add(clazz)) return
         for (c in clazz.superTypes) {
             c.getClass()?.let { buildFakeOverrides(it) }
         }
-        buildFakeOverridesForClass(clazz, false)
+        if (clazz is IrLazyDeclarationBase) {
+            resolveOverridenSymbolsInLazyClass(clazz as Fir2IrLazyClass, resolver)
+        } else {
+            buildFakeOverridesForClass(clazz, false)
+        }
     }
 
     class ClassVisitor : IrElementVisitorVoid {

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirLightTreeJvmIrTextTestGenerated.java

@@ -468,6 +468,12 @@ public class FirLightTreeJvmIrTextTestGenerated extends AbstractFirLightTreeJvmI
             runTest("compiler/testData/ir/irText/declarations/extensionProperties.kt");
         }
 
+        @Test
+        @TestMetadata("fakeOverrideModality.kt")
+        public void testFakeOverrideModality() throws Exception {
+            runTest("compiler/testData/ir/irText/declarations/fakeOverrideModality.kt");
+        }
+
         @Test
         @TestMetadata("fakeOverrides.kt")
         public void testFakeOverrides() throws Exception {
@@ -540,6 +546,12 @@ public class FirLightTreeJvmIrTextTestGenerated extends AbstractFirLightTreeJvmI
             runTest("compiler/testData/ir/irText/declarations/kt52677.kt");
         }
 
+        @Test
+        @TestMetadata("kt65236.kt")
+        public void testKt65236() throws Exception {
+            runTest("compiler/testData/ir/irText/declarations/kt65236.kt");
+        }
+
         @Test
         @TestMetadata("kt65432.kt")
         public void testKt65432() throws Exception {

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirPsiJvmIrTextTestGenerated.java

@@ -468,6 +468,12 @@ public class FirPsiJvmIrTextTestGenerated extends AbstractFirPsiJvmIrTextTest {
             runTest("compiler/testData/ir/irText/declarations/extensionProperties.kt");
         }
 
+        @Test
+        @TestMetadata("fakeOverrideModality.kt")
+        public void testFakeOverrideModality() throws Exception {
+            runTest("compiler/testData/ir/irText/declarations/fakeOverrideModality.kt");
+        }
+
         @Test
         @TestMetadata("fakeOverrides.kt")
         public void testFakeOverrides() throws Exception {
@@ -540,6 +546,12 @@ public class FirPsiJvmIrTextTestGenerated extends AbstractFirPsiJvmIrTextTest {
             runTest("compiler/testData/ir/irText/declarations/kt52677.kt");
         }
 
+        @Test
+        @TestMetadata("kt65236.kt")
+        public void testKt65236() throws Exception {
+            runTest("compiler/testData/ir/irText/declarations/kt65236.kt");
+        }
+
         @Test
         @TestMetadata("kt65432.kt")
         public void testKt65432() throws Exception {

compiler/testData/codegen/box/sameFileInSourceAndDependencies/classDeclaration.kt

@@ -1,6 +1,11 @@
 // NATIVE error: static cache is broken: ld.gold invocation reported errors. Please try to disable compiler caches and rerun the build.
 // DONT_TARGET_EXACT_BACKEND: NATIVE
 // IGNORE_BACKEND: JS_IR, JS_IR_ES6
+
+// KT-65416
+// IGNORE_BACKEND_K2: WASM
+
+
 // MODULE: lib
 // FILE: 2.kt
 abstract class A {

compiler/testData/codegen/box/sameFileInSourceAndDependencies/lateinitMemberPropertyDeclaration.kt

@@ -1,6 +1,10 @@
 // NATIVE error: static cache is broken: ld.gold invocation reported errors. Please try to disable compiler caches and rerun the build.
 // DONT_TARGET_EXACT_BACKEND: NATIVE
 // IGNORE_BACKEND: JS_IR, JS_IR_ES6
+
+// KT-65416
+// IGNORE_BACKEND_K2: WASM
+
 // MODULE: lib
 // FILE: 2.kt
 abstract class A {

compiler/testData/codegen/box/sameFileInSourceAndDependencies/memberFunctionDeclaration.kt

@@ -1,6 +1,11 @@
 // NATIVE error: static cache is broken: ld.gold invocation reported errors. Please try to disable compiler caches and rerun the build.
 // DONT_TARGET_EXACT_BACKEND: NATIVE
 // IGNORE_BACKEND: JS_IR, JS_IR_ES6
+
+// KT-65416
+// IGNORE_BACKEND_K2: WASM
+
+
 // MODULE: lib
 // FILE: 2.kt
 abstract class A {

compiler/testData/codegen/box/sameFileInSourceAndDependencies/memberFunctionWithDefaultArgumentsDeclaration.kt

@@ -1,6 +1,11 @@
 // NATIVE error: static cache is broken: ld.gold invocation reported errors. Please try to disable compiler caches and rerun the build.
 // DONT_TARGET_EXACT_BACKEND: NATIVE
 // IGNORE_BACKEND: JS_IR, JS_IR_ES6
+
+// KT-65416
+// IGNORE_BACKEND_K2: WASM
+
+
 // MODULE: lib
 // FILE: 2.kt
 abstract class A {

compiler/testData/codegen/box/sameFileInSourceAndDependencies/memberPropertyDeclaration.kt

@@ -1,6 +1,10 @@
 // NATIVE error: static cache is broken: ld.gold invocation reported errors. Please try to disable compiler caches and rerun the build.
 // DONT_TARGET_EXACT_BACKEND: NATIVE
 // IGNORE_BACKEND: JS_IR, JS_IR_ES6
+
+// KT-65416
+// IGNORE_BACKEND_K2: WASM
+
 // MODULE: lib
 // FILE: 2.kt
 abstract class A {

compiler/testData/ir/irText/declarations/fakeOverrideModality.ir.txt

@@ -0,0 +1,104 @@
+FILE fqName:<root> fileName:/fakeOverrideModality.kt
+  CLASS CLASS name:Base modality:OPEN visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Base
+    CONSTRUCTOR visibility:public <> () returnType:<root>.Base [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Base modality:OPEN visibility:public superTypes:[kotlin.Any]'
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:Child modality:FINAL visibility:public superTypes:[<root>.Base]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Child
+    CONSTRUCTOR visibility:public <> () returnType:<root>.Child [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in <root>.Base'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Child modality:FINAL visibility:public superTypes:[<root>.Base]'
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.Base
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in <root>.Base
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in <root>.Base
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS INTERFACE name:I modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.I
+    FUN name:foo visibility:public modality:ABSTRACT <> ($this:<root>.I) returnType:<root>.Base
+      $this: VALUE_PARAMETER name:<this> type:<root>.I
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:J modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.J
+    CONSTRUCTOR visibility:public <> () returnType:<root>.J [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:J modality:ABSTRACT visibility:public superTypes:[kotlin.Any]'
+    FUN name:foo visibility:public modality:ABSTRACT <> ($this:<root>.J) returnType:<root>.Child
+      $this: VALUE_PARAMETER name:<this> type:<root>.J
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:A modality:ABSTRACT visibility:public superTypes:[<root>.I; <root>.J]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.A
+    CONSTRUCTOR visibility:public <> () returnType:<root>.A [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in <root>.J'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:A modality:ABSTRACT visibility:public superTypes:[<root>.I; <root>.J]'
+    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.J) returnType:<root>.Child [fake_override]
+      overridden:
+        public abstract fun foo (): <root>.Base declared in <root>.I
+        public abstract fun foo (): <root>.Child declared in <root>.J
+      $this: VALUE_PARAMETER name:<this> type:<root>.J
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.I
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.J
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in <root>.I
+        public open fun hashCode (): kotlin.Int declared in <root>.J
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in <root>.I
+        public open fun toString (): kotlin.String declared in <root>.J
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any

compiler/testData/ir/irText/declarations/fakeOverrideModality.kt

@@ -0,0 +1,16 @@
+// FIR_IDENTICAL
+// ENABLE_IR_FAKE_OVERRIDE_GENERATION
+// TARGET_BACKEND: JVM
+
+open class Base
+class Child: Base()
+
+interface I {
+    fun foo(): Base
+}
+
+abstract class J {
+    abstract fun foo(): Child
+}
+
+abstract class A : I, J()

compiler/testData/ir/irText/declarations/fakeOverrideModality.kt.txt

@@ -0,0 +1,42 @@
+open class Base {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+}
+
+class Child : Base {
+  constructor() /* primary */ {
+    super/*Base*/()
+    /* <init>() */
+
+  }
+
+}
+
+interface I {
+  abstract fun foo(): Base
+
+}
+
+abstract class J {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  abstract fun foo(): Child
+
+}
+
+abstract class A : I, J {
+  constructor() /* primary */ {
+    super/*J*/()
+    /* <init>() */
+
+  }
+
+}

compiler/testData/ir/irText/declarations/fakeOverrideModality.sig.kt.txt

@@ -0,0 +1,71 @@
+// CHECK:
+//   Mangled name: A
+//   Public signature: /A|null[0]
+abstract class A : J, I {
+  // CHECK:
+  //   Mangled name: A#<init>(){}
+  //   Public signature: /A.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: A#foo(){}Child
+  //   Public signature: /A.foo|8517421086584195144[0]
+  //   Public signature debug description: foo(){}Child
+  abstract /* fake */ override fun foo(): Child
+
+}
+
+// CHECK:
+//   Mangled name: Base
+//   Public signature: /Base|null[0]
+open class Base {
+  // CHECK:
+  //   Mangled name: Base#<init>(){}
+  //   Public signature: /Base.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+}
+
+// CHECK:
+//   Mangled name: Child
+//   Public signature: /Child|null[0]
+class Child : Base {
+  // CHECK:
+  //   Mangled name: Child#<init>(){}
+  //   Public signature: /Child.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+}
+
+// CHECK:
+//   Mangled name: J
+//   Public signature: /J|null[0]
+abstract class J {
+  // CHECK:
+  //   Mangled name: J#<init>(){}
+  //   Public signature: /J.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+  // CHECK JVM_IR:
+  //   Mangled name: J#foo(){}Child
+  //   Public signature: /J.foo|8517421086584195144[0]
+  //   Public signature debug description: foo(){}Child
+  abstract fun foo(): Child
+
+}
+
+// CHECK:
+//   Mangled name: I
+//   Public signature: /I|null[0]
+interface I {
+  // CHECK JVM_IR:
+  //   Mangled name: I#foo(){}Base
+  //   Public signature: /I.foo|-5590126600799232132[0]
+  //   Public signature debug description: foo(){}Base
+  abstract fun foo(): Base
+
+}

compiler/testData/ir/irText/declarations/kt65236.ir.txt

@@ -0,0 +1,117 @@
+FILE fqName:<root> fileName:/E.kt
+  CLASS INTERFACE name:II modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.II
+    FUN name:foo visibility:public modality:OPEN <> ($this:<root>.II) returnType:kotlin.Unit
+      $this: VALUE_PARAMETER name:<this> type:<root>.II
+      BLOCK_BODY
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS INTERFACE name:I modality:ABSTRACT visibility:public superTypes:[<root>.II]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.I
+    FUN FAKE_OVERRIDE name:foo visibility:public modality:OPEN <> ($this:<root>.II) returnType:kotlin.Unit [fake_override]
+      overridden:
+        public open fun foo (): kotlin.Unit declared in <root>.II
+      $this: VALUE_PARAMETER name:<this> type:<root>.II
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.II
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in <root>.II
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in <root>.II
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:C modality:ABSTRACT visibility:public superTypes:[<root>.I]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.C
+    CONSTRUCTOR visibility:public <> () returnType:<root>.C [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:C modality:ABSTRACT visibility:public superTypes:[<root>.I]'
+    FUN name:foo visibility:public modality:ABSTRACT <> ($this:<root>.C) returnType:kotlin.Unit
+      overridden:
+        public open fun foo (): kotlin.Unit declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:<root>.C
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:D modality:ABSTRACT visibility:public superTypes:[<root>.C; <root>.J]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.D
+    CONSTRUCTOR visibility:public <> () returnType:<root>.D [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in <root>.C'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:D modality:ABSTRACT visibility:public superTypes:[<root>.C; <root>.J]'
+    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.C) returnType:kotlin.Unit [fake_override]
+      overridden:
+        public abstract fun foo (): kotlin.Unit declared in <root>.C
+        public open fun foo (): kotlin.Unit declared in <root>.J
+      $this: VALUE_PARAMETER name:<this> type:<root>.C
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.C
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.J
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in <root>.C
+        public open fun hashCode (): kotlin.Int declared in <root>.J
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in <root>.C
+        public open fun toString (): kotlin.String declared in <root>.J
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:E modality:FINAL visibility:public superTypes:[<root>.D]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.E
+    CONSTRUCTOR visibility:public <> () returnType:<root>.E [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in <root>.D'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:E modality:FINAL visibility:public superTypes:[<root>.D]'
+    FUN name:foo visibility:public modality:OPEN <> ($this:<root>.E) returnType:kotlin.Unit
+      overridden:
+        public abstract fun foo (): kotlin.Unit declared in <root>.D
+      $this: VALUE_PARAMETER name:<this> type:<root>.E
+      BLOCK_BODY
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in <root>.D
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in <root>.D
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in <root>.D
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  FUN name:foo visibility:public modality:FINAL <> (x:<root>.I) returnType:kotlin.Unit
+    VALUE_PARAMETER name:x index:0 type:<root>.I
+    BLOCK_BODY
+      CALL 'public open fun foo (): kotlin.Unit declared in <root>.I' type=kotlin.Unit origin=null
+        $this: GET_VAR 'x: <root>.I declared in <root>.foo' type=<root>.I origin=null

compiler/testData/ir/irText/declarations/kt65236.kt

@@ -0,0 +1,32 @@
+// FIR_IDENTICAL
+// ENABLE_IR_FAKE_OVERRIDE_GENERATION
+// TARGET_BACKEND: JVM
+
+// FILE: J.java
+
+interface J extends I {
+
+}
+
+// FILE: E.kt
+
+interface II {
+    fun foo() {}
+}
+
+interface I : II {
+}
+
+abstract class C: I {
+    override abstract fun foo()
+}
+
+abstract class D : C(), J {}
+
+class E : D() {
+    override fun foo() {}
+}
+
+fun foo(x : I) {
+    x.foo()
+}

compiler/testData/ir/irText/declarations/kt65236.kt.txt

@@ -0,0 +1,44 @@
+interface II {
+  fun foo() {
+  }
+
+}
+
+interface I : II {
+}
+
+abstract class C : I {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  abstract override fun foo()
+
+}
+
+abstract class D : C, J {
+  constructor() /* primary */ {
+    super/*C*/()
+    /* <init>() */
+
+  }
+
+}
+
+class E : D {
+  constructor() /* primary */ {
+    super/*D*/()
+    /* <init>() */
+
+  }
+
+  override fun foo() {
+  }
+
+}
+
+fun foo(x: I) {
+  x.foo()
+}

compiler/testData/ir/irText/declarations/kt65236.sig.kt.txt

@@ -0,0 +1,83 @@
+// CHECK:
+//   Mangled name: C
+//   Public signature: /C|null[0]
+abstract class C : I {
+  // CHECK:
+  //   Mangled name: C#<init>(){}
+  //   Public signature: /C.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+  // CHECK:
+  //   Mangled name: C#foo(){}
+  //   Public signature: /C.foo|-1041209573719867811[0]
+  //   Public signature debug description: foo(){}
+  abstract override fun foo(): Unit
+
+}
+
+// CHECK:
+//   Mangled name: D
+//   Public signature: /D|null[0]
+abstract class D : C, J {
+  // CHECK:
+  //   Mangled name: D#<init>(){}
+  //   Public signature: /D.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+  // CHECK:
+  //   Mangled name: D#foo(){}
+  //   Public signature: /D.foo|-1041209573719867811[0]
+  //   Public signature debug description: foo(){}
+  abstract /* fake */ override fun foo(): Unit
+
+}
+
+// CHECK:
+//   Mangled name: E
+//   Public signature: /E|null[0]
+class E : D {
+  // CHECK:
+  //   Mangled name: E#<init>(){}
+  //   Public signature: /E.<init>|-5645683436151566731[0]
+  //   Public signature debug description: <init>(){}
+  constructor() /* primary */
+
+  // CHECK:
+  //   Mangled name: E#foo(){}
+  //   Public signature: /E.foo|-1041209573719867811[0]
+  //   Public signature debug description: foo(){}
+  override fun foo(): Unit
+
+}
+
+// CHECK:
+//   Mangled name: I
+//   Public signature: /I|null[0]
+interface I : II {
+  // CHECK:
+  //   Mangled name: I#foo(){}
+  //   Public signature: /I.foo|-1041209573719867811[0]
+  //   Public signature debug description: foo(){}
+  /* fake */ override fun foo(): Unit
+
+}
+
+// CHECK:
+//   Mangled name: II
+//   Public signature: /II|null[0]
+interface II {
+  // CHECK:
+  //   Mangled name: II#foo(){}
+  //   Public signature: /II.foo|-1041209573719867811[0]
+  //   Public signature debug description: foo(){}
+  fun foo(): Unit
+
+}
+
+// CHECK:
+//   Mangled name: #foo(I){}
+//   Public signature: /foo|-4109751996049019888[0]
+//   Public signature debug description: foo(I){}
+fun foo(x: I): Unit

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/ClassicJvmIrTextTestGenerated.java

@@ -468,6 +468,12 @@ public class ClassicJvmIrTextTestGenerated extends AbstractClassicJvmIrTextTest
             runTest("compiler/testData/ir/irText/declarations/extensionProperties.kt");
         }
 
+        @Test
+        @TestMetadata("fakeOverrideModality.kt")
+        public void testFakeOverrideModality() throws Exception {
+            runTest("compiler/testData/ir/irText/declarations/fakeOverrideModality.kt");
+        }
+
         @Test
         @TestMetadata("fakeOverrides.kt")
         public void testFakeOverrides() throws Exception {
@@ -540,6 +546,12 @@ public class ClassicJvmIrTextTestGenerated extends AbstractClassicJvmIrTextTest
             runTest("compiler/testData/ir/irText/declarations/kt52677.kt");
         }
 
+        @Test
+        @TestMetadata("kt65236.kt")
+        public void testKt65236() throws Exception {
+            runTest("compiler/testData/ir/irText/declarations/kt65236.kt");
+        }
+
         @Test
         @TestMetadata("kt65432.kt")
         public void testKt65432() throws Exception {