Generate classes in MultifileClassCodegen exactly the same as in PackageCodegen

Two known issues with generateNonPartClassDeclarations that was here
before were the fact that we didn't sort sealed classes and its
subclasses which led to NoSuchMethodError (KT-27097), and the fact that
we didn't skip expect classes which led to incorrect duplicate JVM class
name diagnostic (KT-30843)

 #KT-27097 Fixed
 #KT-30843 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/MultifileClassCodegen.kt

@@ -34,7 +34,6 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.progress.ProgressIndicatorAndCompilationCanceledStatus
 import org.jetbrains.kotlin.psi.KtClassOrObject
 import org.jetbrains.kotlin.psi.KtFile
-import org.jetbrains.kotlin.psi.KtScript
 import org.jetbrains.kotlin.psi.KtTypeAlias
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.MemberComparator
@@ -199,7 +198,7 @@ class MultifileClassCodegenImpl(
         val partType = Type.getObjectType(JvmFileClassUtil.getFileClassInternalName(file))
         val partContext = state.rootContext.intoMultifileClassPart(packageFragment, facadeClassType, partType, file)
 
-        generateNonPartClassDeclarations(file, partContext)
+        PackageCodegenImpl.generateClassesAndObjectsInFile(file, partContext, state)
 
         if (!state.generateDeclaredClassFilter.shouldGeneratePackagePart(file) || !file.hasDeclarationsForPartClass()) return
 
@@ -214,21 +213,6 @@ class MultifileClassCodegenImpl(
         addDelegateGenerationTasksForDeclarationsInFile(file, packageFragment, partType)
     }
 
-    private fun generateNonPartClassDeclarations(file: KtFile, partContext: FieldOwnerContext<PackageFragmentDescriptor>) {
-        for (declaration in file.declarations) {
-            when (declaration) {
-                is KtClassOrObject ->
-                    if (state.generateDeclaredClassFilter.shouldGenerateClass(declaration)) {
-                        generateClassOrObject(declaration, partContext)
-                    }
-                is KtScript ->
-                    if (state.generateDeclaredClassFilter.shouldGenerateScript(declaration)) {
-                        ScriptCodegen.createScriptCodegen(declaration, state, partContext).generate()
-                    }
-            }
-        }
-    }
-
     private fun addDelegateGenerationTasksForDeclarationsInFile(file: KtFile, packageFragment: PackageFragmentDescriptor, partType: Type) {
         val facadeContext = state.rootContext.intoMultifileClass(packageFragment, facadeClassType, partType)
         val memberCodegen = createCodegenForDelegatesInMultifileFacade(facadeContext)

compiler/backend/src/org/jetbrains/kotlin/codegen/PackageCodegen.java

@@ -17,17 +17,10 @@
 package org.jetbrains.kotlin.codegen;
 
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.kotlin.codegen.context.PackageContext;
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor;
-import org.jetbrains.kotlin.psi.KtClassOrObject;
-import org.jetbrains.kotlin.psi.KtFile;
-
-import java.util.Collection;
 
 public interface PackageCodegen {
     void generate(@NotNull CompilationErrorHandler errorHandler);
 
-    void generateClassOrObject(@NotNull KtClassOrObject classOrObject, @NotNull PackageContext packagePartContext);
-
     PackageFragmentDescriptor getPackageFragment();
 }

compiler/backend/src/org/jetbrains/kotlin/codegen/PackageCodegenImpl.java

@@ -23,6 +23,7 @@ import com.intellij.util.SmartList;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.kotlin.backend.common.CodegenUtil;
+import org.jetbrains.kotlin.codegen.context.CodegenContext;
 import org.jetbrains.kotlin.codegen.context.PackageContext;
 import org.jetbrains.kotlin.codegen.state.GenerationState;
 import org.jetbrains.kotlin.descriptors.ClassDescriptor;
@@ -82,9 +83,39 @@ public class PackageCodegenImpl implements PackageCodegen {
         }
     }
 
-    private void generateClassesAndObjectsInFile(@NotNull List<KtClassOrObject> classOrObjects, @NotNull PackageContext packagePartContext) {
-        for (KtClassOrObject classOrObject : CodegenUtilKt.sortTopLevelClassesAndPrepareContextForSealedClasses(classOrObjects, packagePartContext, state)) {
-            generateClassOrObject(classOrObject, packagePartContext);
+    public static void generateClassesAndObjectsInFile(
+            @NotNull KtFile file,
+            @NotNull CodegenContext<?> context,
+            @NotNull GenerationState state
+    ) {
+        List<KtClassOrObject> classOrObjects = new ArrayList<>();
+
+        for (KtDeclaration declaration : file.getDeclarations()) {
+            if (declaration instanceof KtClassOrObject) {
+                ClassDescriptor descriptor = state.getBindingContext().get(BindingContext.CLASS, declaration);
+                if (PsiUtilsKt.hasExpectModifier(declaration) &&
+                    (descriptor == null || !ExpectedActualDeclarationChecker.shouldGenerateExpectClass(descriptor))) {
+                    continue;
+                }
+
+                KtClassOrObject classOrObject = (KtClassOrObject) declaration;
+                if (state.getGenerateDeclaredClassFilter().shouldGenerateClass(classOrObject)) {
+                    classOrObjects.add(classOrObject);
+                }
+            }
+            else if (declaration instanceof KtScript) {
+                KtScript script = (KtScript) declaration;
+
+                if (state.getGenerateDeclaredClassFilter().shouldGenerateScript(script)) {
+                    ScriptCodegen.createScriptCodegen(script, state, context).generate();
+                }
+            }
+        }
+
+        List<KtClassOrObject> sortedClasses =
+                CodegenUtilKt.sortTopLevelClassesAndPrepareContextForSealedClasses(classOrObjects, context, state);
+        for (KtClassOrObject classOrObject : sortedClasses) {
+            MemberCodegen.genClassOrObject(context, classOrObject, state, null);
         }
     }
 
@@ -103,31 +134,7 @@ public class PackageCodegenImpl implements PackageCodegen {
                 CodeFragmentCodegen.createCodegen((KtCodeFragment) file, state, packagePartContext).generate();
             }
         } else {
-            List<KtClassOrObject> classOrObjects = new ArrayList<>();
-
-            for (KtDeclaration declaration : file.getDeclarations()) {
-                if (declaration instanceof KtClassOrObject) {
-                    ClassDescriptor descriptor = state.getBindingContext().get(BindingContext.CLASS, declaration);
-                    if (PsiUtilsKt.hasExpectModifier(declaration) &&
-                        (descriptor == null || !ExpectedActualDeclarationChecker.shouldGenerateExpectClass(descriptor))) {
-                        continue;
-                    }
-
-                    KtClassOrObject classOrObject = (KtClassOrObject) declaration;
-                    if (state.getGenerateDeclaredClassFilter().shouldGenerateClass(classOrObject)) {
-                        classOrObjects.add(classOrObject);
-                    }
-                }
-                else if (declaration instanceof KtScript) {
-                    KtScript script = (KtScript) declaration;
-
-                    if (state.getGenerateDeclaredClassFilter().shouldGenerateScript(script)) {
-                        ScriptCodegen.createScriptCodegen(script, state, packagePartContext).generate();
-                    }
-                }
-            }
-
-            generateClassesAndObjectsInFile(classOrObjects, packagePartContext);
+            generateClassesAndObjectsInFile(file, packagePartContext, state);
         }
 
         if (!state.getGenerateDeclaredClassFilter().shouldGeneratePackagePart(file)) return;
@@ -166,11 +173,6 @@ public class PackageCodegenImpl implements PackageCodegen {
         return fragments.get(0);
     }
 
-    @Override
-    public void generateClassOrObject(@NotNull KtClassOrObject classOrObject, @NotNull PackageContext packagePartContext) {
-        MemberCodegen.genClassOrObject(packagePartContext, classOrObject, state, null);
-    }
-
     @Override
     public PackageFragmentDescriptor getPackageFragment() {
         return packageFragment;

compiler/backend/src/org/jetbrains/kotlin/codegen/codegenUtil.kt

@@ -8,12 +8,11 @@ package org.jetbrains.kotlin.codegen
 import com.intellij.psi.PsiElement
 import org.jetbrains.annotations.TestOnly
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.codegen.binding.CodegenBinding
 import org.jetbrains.kotlin.builtins.UnsignedTypes
+import org.jetbrains.kotlin.codegen.binding.CodegenBinding
 import org.jetbrains.kotlin.codegen.context.CodegenContext
 import org.jetbrains.kotlin.codegen.context.FieldOwnerContext
 import org.jetbrains.kotlin.codegen.context.MultifileClassFacadeContext
-import org.jetbrains.kotlin.codegen.context.PackageContext
 import org.jetbrains.kotlin.codegen.coroutines.continuationAsmType
 import org.jetbrains.kotlin.codegen.coroutines.unwrapInitialDescriptorForSuspendFunction
 import org.jetbrains.kotlin.codegen.inline.NUMBERED_FUNCTION_PREFIX
@@ -169,13 +168,13 @@ fun populateCompanionBackingFieldNamesToOuterContextIfNeeded(
 // so that we'd generate the necessary accessor for its constructor afterwards
 fun sortTopLevelClassesAndPrepareContextForSealedClasses(
     classOrObjects: List<KtClassOrObject>,
-    packagePartContext: PackageContext,
+    context: CodegenContext<*>,
     state: GenerationState
 ): List<KtClassOrObject> {
     fun prepareContextIfNeeded(descriptor: ClassDescriptor?) {
         if (DescriptorUtils.isSealedClass(descriptor)) {
             // save context for sealed class
-            packagePartContext.intoClass(descriptor!!, OwnerKind.IMPLEMENTATION, state)
+            context.intoClass(descriptor!!, OwnerKind.IMPLEMENTATION, state)
         }
     }
 

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

@@ -18,11 +18,9 @@ package org.jetbrains.kotlin.backend.jvm
 
 import org.jetbrains.kotlin.backend.common.phaser.PhaseConfig
 import org.jetbrains.kotlin.codegen.*
-import org.jetbrains.kotlin.codegen.context.PackageContext
 import org.jetbrains.kotlin.codegen.state.GenerationState
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.psi.KtClassOrObject
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi2ir.Psi2IrTranslator
 
@@ -45,10 +43,6 @@ class JvmIrCodegenFactory(private val phaseConfig: PhaseConfig) : CodegenFactory
                 JvmBackendFacade.doGenerateFiles(files, state, errorHandler, phaseConfig)
             }
 
-            override fun generateClassOrObject(classOrObject: KtClassOrObject, packagePartContext: PackageContext) {
-                TODO()
-            }
-
             override fun getPackageFragment(): PackageFragmentDescriptor {
                 return impl.packageFragment
             }

compiler/light-classes/src/org/jetbrains/kotlin/asJava/builder/LightClassDataProvider.kt

@@ -27,6 +27,7 @@ import org.jetbrains.kotlin.asJava.KotlinAsJavaSupport
 import org.jetbrains.kotlin.asJava.LightClassGenerationSupport
 import org.jetbrains.kotlin.asJava.classes.getOutermostClassOrObject
 import org.jetbrains.kotlin.codegen.CompilationErrorHandler
+import org.jetbrains.kotlin.codegen.MemberCodegen
 import org.jetbrains.kotlin.codegen.state.GenerationState
 import org.jetbrains.kotlin.fileClasses.JvmFileClassUtil
 import org.jetbrains.kotlin.name.FqName
@@ -48,7 +49,7 @@ class LightClassDataProviderForClassOrObject(
                 val packageCodegen = state.factory.forPackage(packageFqName, files)
                 val packagePartType = Type.getObjectType(JvmFileClassUtil.getFileClassInternalName(file))
                 val context = state.rootContext.intoPackagePart(packageCodegen.packageFragment, packagePartType, file)
-                packageCodegen.generateClassOrObject(getOutermostClassOrObject(classOrObject), context)
+                MemberCodegen.genClassOrObject(context, getOutermostClassOrObject(classOrObject), state, null)
                 state.factory.done()
             }
         }

compiler/testData/codegen/box/multifileClasses/sealedClassHierarchy.kt

@@ -0,0 +1,13 @@
+// IGNORE_BACKEND: JVM_IR
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+
+@file:JvmMultifileClass
+@file:JvmName("Test")
+package test
+
+sealed class Foo(val value: String)
+
+class Bar : Foo("OK")
+
+fun box(): String = Bar().value

compiler/testData/codegen/box/multiplatform/expectClassInJvmMultifileFacade.kt

@@ -0,0 +1,25 @@
+// !LANGUAGE: +MultiPlatformProjects
+// IGNORE_BACKEND: JVM_IR
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+// FILE: common.kt
+
+@file:JvmMultifileClass
+@file:JvmName("Test")
+package test
+
+expect class Foo {
+    val value: String
+}
+
+// FILE: jvm.kt
+
+@file:JvmMultifileClass
+@file:JvmName("Test")
+package test
+
+actual class Foo(actual val value: String)
+
+fun box(): String {
+    return Foo("OK").value
+}

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -15822,6 +15822,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/multifileClasses/samePartNameDifferentFacades.kt");
         }
 
+        @TestMetadata("sealedClassHierarchy.kt")
+        public void testSealedClassHierarchy() throws Exception {
+            runTest("compiler/testData/codegen/box/multifileClasses/sealedClassHierarchy.kt");
+        }
+
         @TestMetadata("compiler/testData/codegen/box/multifileClasses/optimized")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)
@@ -15878,6 +15883,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/multiplatform"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM, true);
         }
 
+        @TestMetadata("expectClassInJvmMultifileFacade.kt")
+        public void testExpectClassInJvmMultifileFacade() throws Exception {
+            runTest("compiler/testData/codegen/box/multiplatform/expectClassInJvmMultifileFacade.kt");
+        }
+
         @TestMetadata("noArgActualConstructor.kt")
         public void testNoArgActualConstructor() throws Exception {
             runTest("compiler/testData/codegen/box/multiplatform/noArgActualConstructor.kt");

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -15822,6 +15822,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/multifileClasses/samePartNameDifferentFacades.kt");
         }
 
+        @TestMetadata("sealedClassHierarchy.kt")
+        public void testSealedClassHierarchy() throws Exception {
+            runTest("compiler/testData/codegen/box/multifileClasses/sealedClassHierarchy.kt");
+        }
+
         @TestMetadata("compiler/testData/codegen/box/multifileClasses/optimized")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)
@@ -15878,6 +15883,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/multiplatform"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM, true);
         }
 
+        @TestMetadata("expectClassInJvmMultifileFacade.kt")
+        public void testExpectClassInJvmMultifileFacade() throws Exception {
+            runTest("compiler/testData/codegen/box/multiplatform/expectClassInJvmMultifileFacade.kt");
+        }
+
         @TestMetadata("noArgActualConstructor.kt")
         public void testNoArgActualConstructor() throws Exception {
             runTest("compiler/testData/codegen/box/multiplatform/noArgActualConstructor.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -15827,6 +15827,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/multifileClasses/samePartNameDifferentFacades.kt");
         }
 
+        @TestMetadata("sealedClassHierarchy.kt")
+        public void testSealedClassHierarchy() throws Exception {
+            runTest("compiler/testData/codegen/box/multifileClasses/sealedClassHierarchy.kt");
+        }
+
         @TestMetadata("compiler/testData/codegen/box/multifileClasses/optimized")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)
@@ -15883,6 +15888,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/multiplatform"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM_IR, true);
         }
 
+        @TestMetadata("expectClassInJvmMultifileFacade.kt")
+        public void testExpectClassInJvmMultifileFacade() throws Exception {
+            runTest("compiler/testData/codegen/box/multiplatform/expectClassInJvmMultifileFacade.kt");
+        }
+
         @TestMetadata("noArgActualConstructor.kt")
         public void testNoArgActualConstructor() throws Exception {
             runTest("compiler/testData/codegen/box/multiplatform/noArgActualConstructor.kt");