[IR] Simplify IrFileImpl and IrExternalPackageFragment

#KT-65773 In Progress

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -27,7 +27,6 @@ import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.declarations.IrFunctionBuilder
 import org.jetbrains.kotlin.ir.builders.declarations.addValueParameter
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
 import org.jetbrains.kotlin.ir.expressions.impl.IrConstructorCallImpl
 import org.jetbrains.kotlin.ir.symbols.*
@@ -607,7 +606,7 @@ class IrBuiltInsOverFir(
     }
 
     private fun createPackage(fqName: FqName): IrExternalPackageFragment =
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(moduleDescriptor, fqName)
+        createEmptyExternalPackageFragment(moduleDescriptor, fqName)
 
     private fun IrDeclarationParent.createFunction(
         name: String,

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/ScriptLowering.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -25,7 +25,6 @@ import org.jetbrains.kotlin.ir.declarations.impl.*
 import org.jetbrains.kotlin.ir.descriptors.toIrBasedKotlinType
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.expressions.impl.*
-import org.jetbrains.kotlin.ir.util.toIrConst
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.symbols.impl.IrAnonymousInitializerSymbolImpl
 import org.jetbrains.kotlin.ir.symbols.impl.IrConstructorSymbolImpl
@@ -34,6 +33,7 @@ import org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.types.impl.IrSimpleTypeImpl
 import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.util.toIrConst
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
@@ -356,7 +356,7 @@ private class ScriptsToClassesLowering(val context: JvmBackendContext, val inner
         }
 
     private val scriptingJvmPackage by lazy(LazyThreadSafetyMode.PUBLICATION) {
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(context.state.module, FqName("kotlin.script.experimental.jvm"))
+        createEmptyExternalPackageFragment(context.state.module, FqName("kotlin.script.experimental.jvm"))
     }
 
     private fun IrClass.addScriptMainFun() {

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/JvmReflectSymbols.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 package org.jetbrains.kotlin.backend.jvm
@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.ir.builders.declarations.addValueParameter
 import org.jetbrains.kotlin.ir.builders.declarations.buildClass
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
+import org.jetbrains.kotlin.ir.declarations.createEmptyExternalPackageFragment
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.types.defaultType
@@ -29,7 +29,7 @@ class JvmReflectSymbols(val context: JvmBackendContext) {
     private val javaLangReflect: FqName = FqName("java.lang.reflect")
 
     private val javaLangReflectPackage: IrPackageFragment =
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(context.state.module, javaLangReflect)
+        createEmptyExternalPackageFragment(context.state.module, javaLangReflect)
 
     val javaLangReflectField: IrClassSymbol =
         createJavaLangReflectClass(FqName("java.lang.reflect.Field")) { klass ->

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/JvmSharedVariablesManager.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -11,7 +11,6 @@ import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.builders.declarations.*
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrVariableImpl
 import org.jetbrains.kotlin.ir.expressions.IrConst
 import org.jetbrains.kotlin.ir.expressions.IrExpression
@@ -31,7 +30,7 @@ class JvmSharedVariablesManager(
     val irBuiltIns: IrBuiltIns,
     irFactory: IrFactory,
 ) : SharedVariablesManager {
-    private val jvmInternalPackage = IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(
+    private val jvmInternalPackage = createEmptyExternalPackageFragment(
         module, FqName("kotlin.jvm.internal")
     )
 

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/JvmSymbols.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -23,7 +23,6 @@ import org.jetbrains.kotlin.descriptors.annotations.KotlinTarget
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.declarations.*
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.expressions.IrRawFunctionReference
 import org.jetbrains.kotlin.ir.expressions.impl.IrConstImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrConstructorCallImpl
@@ -82,7 +81,7 @@ class JvmSymbols(
     private val generateOptimizedCallableReferenceSuperClasses = context.config.generateOptimizedCallableReferenceSuperClasses
 
     private fun createPackage(fqName: FqName): IrPackageFragment =
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(context.state.module, fqName)
+        createEmptyExternalPackageFragment(context.state.module, fqName)
 
     private fun createClass(
         fqName: FqName,
@@ -1091,7 +1090,7 @@ class JvmSymbols(
         private val javaLangAnnotation: FqName = FqName("java.lang.annotation")
 
         private val javaLangAnnotationPackage: IrPackageFragment =
-            IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(context.state.module, javaLangAnnotation)
+            createEmptyExternalPackageFragment(context.state.module, javaLangAnnotation)
 
         private fun buildClass(
             fqName: FqName,

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/descriptors/IrBuiltInsOverDescriptors.kt

@@ -23,7 +23,7 @@ import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrConstructor
 import org.jetbrains.kotlin.ir.declarations.IrExternalPackageFragment
 import org.jetbrains.kotlin.ir.declarations.IrFactory
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
+import org.jetbrains.kotlin.ir.declarations.createEmptyExternalPackageFragment
 import org.jetbrains.kotlin.ir.descriptors.*
 import org.jetbrains.kotlin.ir.expressions.impl.IrConstructorCallImpl
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
@@ -77,7 +77,7 @@ class IrBuiltInsOverDescriptors(
     private val builtInsModule = builtIns.builtInsModule
 
     private val kotlinInternalPackage = StandardClassIds.BASE_INTERNAL_PACKAGE
-    override val kotlinInternalPackageFragment = IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(builtInsModule, kotlinInternalPackage)
+    override val kotlinInternalPackageFragment = createEmptyExternalPackageFragment(builtInsModule, kotlinInternalPackage)
 
     private val packageFragmentDescriptor = IrBuiltinsPackageFragmentDescriptorImpl(builtInsModule, KOTLIN_INTERNAL_IR_FQN)
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrExternalPackageFragment.kt

@@ -12,7 +12,6 @@ import org.jetbrains.kotlin.ir.symbols.IrExternalPackageFragmentSymbol
 import org.jetbrains.kotlin.ir.util.transformInPlace
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
-import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
 
 /**
  * This is a root parent element for external declarations (meaning those that come from
@@ -36,8 +35,6 @@ import org.jetbrains.kotlin.serialization.deserialization.descriptors.Deserializ
 abstract class IrExternalPackageFragment : IrPackageFragment() {
     abstract override val symbol: IrExternalPackageFragmentSymbol
 
-    abstract val containerSource: DeserializedContainerSource?
-
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitExternalPackageFragment(this, data)
 

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrPackageFragment.kt

@@ -8,10 +8,7 @@
 
 package org.jetbrains.kotlin.ir.declarations
 
-import org.jetbrains.kotlin.descriptors.ModuleDescriptor
-import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
 import org.jetbrains.kotlin.ir.IrElementBase
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.symbols.IrPackageFragmentSymbol
 import org.jetbrains.kotlin.name.FqName
 
@@ -21,17 +18,6 @@ import org.jetbrains.kotlin.name.FqName
 abstract class IrPackageFragment : IrElementBase(), IrDeclarationContainer, IrSymbolOwner {
     abstract override val symbol: IrPackageFragmentSymbol
 
-    @ObsoleteDescriptorBasedAPI
-    abstract val packageFragmentDescriptor: PackageFragmentDescriptor
-
-    /**
-     * This should be a link to [IrModuleFragment] instead. 
-     *
-     * Unfortunately, some package fragments (e.g. some synthetic ones and [IrExternalPackageFragment])
-     * are not located in any IR module, but still have a module descriptor. 
-     */
-    abstract val moduleDescriptor: ModuleDescriptor
-
     abstract var packageFqName: FqName
 
     @Deprecated(

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrPackageFragments.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.ir.declarations
+
+import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
+import org.jetbrains.kotlin.descriptors.impl.EmptyPackageFragmentDescriptor
+import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
+import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
+import org.jetbrains.kotlin.ir.declarations.impl.IrFileImpl
+import org.jetbrains.kotlin.ir.symbols.impl.IrExternalPackageFragmentSymbolImpl
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
+import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberDescriptor
+
+
+@ObsoleteDescriptorBasedAPI
+val IrPackageFragment.packageFragmentDescriptor: PackageFragmentDescriptor
+    get() = symbol.descriptor
+
+@OptIn(ObsoleteDescriptorBasedAPI::class)
+val IrExternalPackageFragment.containerSource: DeserializedContainerSource?
+    get() = (symbol.descriptor as? DeserializedMemberDescriptor)?.containerSource
+
+/**
+ * This should be a link to [IrModuleFragment] instead.
+ *
+ * Unfortunately, some package fragments (e.g. some synthetic ones and [IrExternalPackageFragment])
+ * are not located in any IR module, but still have a module descriptor.
+ */
+@OptIn(ObsoleteDescriptorBasedAPI::class)
+val IrPackageFragment.moduleDescriptor
+    get() = if (this is IrFileImpl && isInsideModule) {
+        module.descriptor
+    } else {
+        packageFragmentDescriptor.containingDeclaration
+    }
+
+fun createEmptyExternalPackageFragment(module: ModuleDescriptor, fqName: FqName): IrExternalPackageFragment =
+    IrExternalPackageFragmentImpl(
+        IrExternalPackageFragmentSymbolImpl(EmptyPackageFragmentDescriptor(module, fqName)), fqName
+    )

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrExternalPackageFragmentImpl.kt

@@ -1,38 +1,21 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.ir.declarations.impl
 
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
-import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
-import org.jetbrains.kotlin.descriptors.impl.EmptyPackageFragmentDescriptor
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.declarations.IrExternalPackageFragment
 import org.jetbrains.kotlin.ir.symbols.IrExternalPackageFragmentSymbol
 import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
-import org.jetbrains.kotlin.ir.symbols.impl.IrExternalPackageFragmentSymbolImpl
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
-import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberDescriptor
 
 class IrExternalPackageFragmentImpl(
     override val symbol: IrExternalPackageFragmentSymbol,
-    override var packageFqName: FqName
+    override var packageFqName: FqName,
 ) : IrExternalPackageFragment() {
     override val startOffset: Int
         get() = UNDEFINED_OFFSET
@@ -44,25 +27,18 @@ class IrExternalPackageFragmentImpl(
         symbol.bind(this)
     }
 
-    @ObsoleteDescriptorBasedAPI
-    override val packageFragmentDescriptor: PackageFragmentDescriptor
-        get() = symbol.descriptor
-
-    @OptIn(ObsoleteDescriptorBasedAPI::class)
-    override val moduleDescriptor: ModuleDescriptor
-        get() = packageFragmentDescriptor.containingDeclaration
-
     @UnsafeDuringIrConstructionAPI
     override val declarations: MutableList<IrDeclaration> = ArrayList()
 
-    @OptIn(ObsoleteDescriptorBasedAPI::class)
-    override val containerSource: DeserializedContainerSource?
-        get() = (symbol.descriptor as? DeserializedMemberDescriptor)?.containerSource
-
     companion object {
-        fun createEmptyExternalPackageFragment(module: ModuleDescriptor, fqName: FqName): IrExternalPackageFragment =
-            IrExternalPackageFragmentImpl(
-                IrExternalPackageFragmentSymbolImpl(EmptyPackageFragmentDescriptor(module, fqName)), fqName
+        @Deprecated(
+            message = "Use org.jetbrains.kotlin.ir.declarations.createEmptyExternalPackageFragment instead",
+            replaceWith = ReplaceWith(
+                "createEmptyExternalPackageFragment",
+                "org.jetbrains.kotlin.ir.declarations.createEmptyExternalPackageFragment"
             )
+        )
+        fun createEmptyExternalPackageFragment(module: ModuleDescriptor, fqName: FqName): IrExternalPackageFragment =
+            org.jetbrains.kotlin.ir.declarations.createEmptyExternalPackageFragment(module, fqName)
     }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrFileImpl.kt

@@ -1,25 +1,12 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.ir.declarations.impl
 
-import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
 import org.jetbrains.kotlin.ir.IrFileEntry
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
@@ -61,25 +48,15 @@ class IrFileImpl(
 
     override lateinit var module: IrModuleFragment
 
+    internal val isInsideModule: Boolean
+        get() = ::module.isInitialized
+
     override val startOffset: Int
         get() = 0
 
     override val endOffset: Int
         get() = fileEntry.maxOffset
 
-    @ObsoleteDescriptorBasedAPI
-    override val packageFragmentDescriptor: PackageFragmentDescriptor
-        get() = symbol.descriptor
-
-    @OptIn(ObsoleteDescriptorBasedAPI::class)
-    override val moduleDescriptor: ModuleDescriptor
-        get() {
-            return if (this::module.isInitialized)
-                module.descriptor
-            else
-                packageFragmentDescriptor.containingDeclaration
-        }
-
     @UnsafeDuringIrConstructionAPI
     override val declarations: MutableList<IrDeclaration> = ArrayList()
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/impl/IrErrorClassImpl.kt

@@ -1,17 +1,17 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.ir.types.impl
 
-import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
+import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.descriptors.SourceElement
 import org.jetbrains.kotlin.ir.IrFileEntry
-import org.jetbrains.kotlin.ir.IrImplementationDetail
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrClassImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
 import org.jetbrains.kotlin.ir.symbols.IrFileSymbol
@@ -59,11 +59,6 @@ private object ErrorFile : IrFile() {
         get() = shouldNotBeCalled()
         set(_) {}
 
-    @ObsoleteDescriptorBasedAPI
-    override val packageFragmentDescriptor: PackageFragmentDescriptor
-        get() = shouldNotBeCalled()
-    override val moduleDescriptor: ModuleDescriptor
-        get() = shouldNotBeCalled()
     override var packageFqName: FqName
         get() = FqName.ROOT
         set(_) = shouldNotBeCalled()

compiler/ir/ir.tree/tree-generator/src/org/jetbrains/kotlin/ir/generator/IrTree.kt

@@ -612,17 +612,6 @@ object IrTree : AbstractTreeBuilder() {
         parent(symbolOwner)
 
         +symbol(packageFragmentSymbolType)
-        +field("packageFragmentDescriptor", type(Packages.descriptors, "PackageFragmentDescriptor"), mutable = false) {
-            optInAnnotation = obsoleteDescriptorBasedApiAnnotation
-        }
-        +field("moduleDescriptor", type(Packages.descriptors, "ModuleDescriptor"), mutable = false) {
-            kDoc = """
-            This should be a link to [IrModuleFragment] instead. 
-               
-            Unfortunately, some package fragments (e.g. some synthetic ones and [IrExternalPackageFragment])
-            are not located in any IR module, but still have a module descriptor. 
-            """.trimIndent()
-        }
         +field("packageFqName", type<FqName>())
         +field("fqName", type<FqName>()) {
             defaultValueInBase = "packageFqName"
@@ -660,7 +649,6 @@ object IrTree : AbstractTreeBuilder() {
         parent(packageFragment)
 
         +symbol(externalPackageFragmentSymbolType)
-        +field("containerSource", type<DeserializedContainerSource>(), nullable = true, mutable = false)
     }
     val file: Element by element(Declaration) {
         needTransformMethod()

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/linkage/partial/MissingDeclarationStubGenerator.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.linkage.IrProvider
 import org.jetbrains.kotlin.ir.linkage.partial.PartiallyLinkedDeclarationOrigin
 import org.jetbrains.kotlin.ir.symbols.*
@@ -33,7 +32,7 @@ import org.jetbrains.kotlin.types.error.ErrorUtils
  */
 internal class MissingDeclarationStubGenerator(private val builtIns: IrBuiltIns) : IrProvider {
     private val commonParent by lazy {
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(ErrorUtils.errorModule, FqName.ROOT)
+        createEmptyExternalPackageFragment(ErrorUtils.errorModule, FqName.ROOT)
     }
 
     private var declarationsToPatch = arrayListOf<IrDeclaration>()

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrModuleSerializer.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -9,6 +9,7 @@ import org.jetbrains.kotlin.builtins.FunctionInterfacePackageFragment
 import org.jetbrains.kotlin.ir.IrDiagnosticReporter
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.declarations.packageFragmentDescriptor
 import org.jetbrains.kotlin.library.SerializedIrFile
 import org.jetbrains.kotlin.library.SerializedIrModule
 

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/KotlinIrLinker.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -15,10 +15,7 @@ import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.builders.TranslationPluginContext
-import org.jetbrains.kotlin.ir.declarations.IrDeclaration
-import org.jetbrains.kotlin.ir.declarations.IrFile
-import org.jetbrains.kotlin.ir.declarations.IrFunction
-import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.linkage.IrDeserializer
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.util.*

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/Imports.kt

@@ -1,6 +1,6 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
- * that can be found in the LICENSE file.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.backend.konan.llvm
@@ -9,6 +9,7 @@ import org.jetbrains.kotlin.backend.konan.Context
 import org.jetbrains.kotlin.backend.konan.descriptors.isExpectMember
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
+import org.jetbrains.kotlin.ir.declarations.moduleDescriptor
 import org.jetbrains.kotlin.library.metadata.CompiledKlibModuleOrigin
 import org.jetbrains.kotlin.library.metadata.SyntheticModulesOrigin
 import org.jetbrains.kotlin.library.metadata.klibModuleOrigin
@@ -17,8 +18,7 @@ private val ModuleDescriptor.llvmSymbolOrigin: CompiledKlibModuleOrigin
     get() {
         assert(!this.isExpectMember) { this }
 
-        val moduleOrigin = klibModuleOrigin
-        when (moduleOrigin) {
+        when (val moduleOrigin = klibModuleOrigin) {
             is CompiledKlibModuleOrigin -> return moduleOrigin
             SyntheticModulesOrigin -> error("Declaration is synthetic and can't be an origin of LLVM symbol:\n${this}")
         }

plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/parcel/ir/AndroidSymbols.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 // This file was autogenerated based on android.jar, do not edit it directly.
@@ -14,7 +14,7 @@ import org.jetbrains.kotlin.ir.builders.declarations.*
 import org.jetbrains.kotlin.ir.declarations.IrFactory
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
+import org.jetbrains.kotlin.ir.declarations.createEmptyExternalPackageFragment
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.types.defaultType
@@ -445,7 +445,7 @@ class AndroidSymbols(
     }.symbol
 
     private fun createPackage(packageName: String): IrPackageFragment =
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(
+        createEmptyExternalPackageFragment(
             moduleFragment.descriptor,
             FqName(packageName)
         )

plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/codegen/AndroidIrExtension.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -26,7 +26,6 @@ import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.*
 import org.jetbrains.kotlin.ir.builders.declarations.*
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.expressions.impl.IrBlockImpl
@@ -87,7 +86,7 @@ private class AndroidIrTransformer(val extension: AndroidIrExtension, val plugin
 
     private fun createPackage(fqName: FqName) =
         cachedPackages.getOrPut(fqName) {
-            IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(pluginContext.moduleDescriptor, fqName)
+            createEmptyExternalPackageFragment(pluginContext.moduleDescriptor, fqName)
         }
 
     private fun createClass(fqName: FqName, isInterface: Boolean = false) =

plugins/atomicfu/atomicfu-compiler/src/org/jetbrains/kotlinx/atomicfu/compiler/backend/common/AbstractAtomicSymbols.kt

@@ -1,20 +1,17 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlinx.atomicfu.compiler.backend.common
 
 import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns.isPrimitiveType
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
-import org.jetbrains.kotlin.ir.builders.declarations.addConstructor
 import org.jetbrains.kotlin.ir.builders.declarations.buildClass
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
 import org.jetbrains.kotlin.ir.expressions.impl.IrConstructorCallImpl
@@ -124,7 +121,7 @@ abstract class AbstractAtomicSymbols(
     }
 
     protected fun createPackage(packageName: String): IrPackageFragment =
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(
+        createEmptyExternalPackageFragment(
             moduleFragment.descriptor,
             FqName(packageName)
         )

plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/SerialInfoImplJvmIrGenerator.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -11,7 +11,6 @@ import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.declarations.*
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.expressions.impl.*
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
@@ -95,7 +94,7 @@ class SerialInfoImplJvmIrGenerator(
     }
 
     private fun createPackage(packageName: String): IrPackageFragment =
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(
+        createEmptyExternalPackageFragment(
             moduleFragment.descriptor,
             FqName(packageName)
         )

plugins/parcelize/parcelize-compiler/parcelize.backend/src/org/jetbrains/kotlin/parcelize/AndroidSymbols.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -17,6 +17,7 @@ import org.jetbrains.kotlin.ir.declarations.IrDeclarationOrigin
 import org.jetbrains.kotlin.ir.declarations.IrFactory
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
+import org.jetbrains.kotlin.ir.declarations.createEmptyExternalPackageFragment
 import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.symbols.*
@@ -552,7 +553,7 @@ class AndroidSymbols(
         }.symbol
 
     private fun createPackage(packageName: String): IrPackageFragment =
-        IrExternalPackageFragmentImpl.createEmptyExternalPackageFragment(
+        createEmptyExternalPackageFragment(
             moduleFragment.descriptor,
             FqName(packageName)
         )