JVM_IR: remove descriptors from JvmCoercionToUnitPatcher

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

@@ -30,11 +30,7 @@ import org.jetbrains.kotlin.name.NameUtils
 class JvmLower(val context: JvmBackendContext) {
     fun lower(irFile: IrFile) {
         // TODO run lowering passes as callbacks in bottom-up visitor
-        JvmCoercionToUnitPatcher(
-            context.builtIns,
-            context.irBuiltIns,
-            TypeTranslator(context.ir.symbols.externalSymbolTable, context.state.languageVersionSettings)
-        ).lower(irFile)
+        JvmCoercionToUnitPatcher(context).lower(irFile)
         FileClassLowering(context).lower(irFile)
         KCallableNamePropertyLowering(context).lower(irFile)
 

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

@@ -46,5 +46,35 @@ class FileClassLowering(val context: JvmBackendContext) : FileLoweringPass {
         irFile.declarations.clear()
         irFile.declarations.addAll(classes)
     }
+
+    fun createFileClass(irFile: IrFile, fileClassMembers: List<IrDeclaration>): IrClass {
+        val fileEntry = irFile.fileEntry
+        val ktFile = context.psiSourceManager.getKtFile(fileEntry as PsiSourceManager.PsiFileEntry)
+            ?: throw AssertionError("Unexpected file entry: $fileEntry")
+        val fileClassInfo = JvmFileClassUtil.getFileClassInfoNoResolve(ktFile)
+        val descriptor = WrappedClassDescriptor(sourceElement = KotlinSourceElement(ktFile))
+        return IrClassImpl(
+            0, fileEntry.maxOffset,
+            IrDeclarationOrigin.DEFINED,
+            symbol = IrClassSymbolImpl(descriptor),
+            name = fileClassInfo.fileClassFqName.shortName(),
+            kind = ClassKind.CLASS,
+            visibility = Visibilities.PUBLIC,
+            modality = Modality.FINAL,
+            isCompanion = false,
+            isInner = false,
+            isData = false,
+            isExternal = false,
+            isInline = false
+        ).apply {
+            descriptor.bind(this)
+            superTypes.add(context.irBuiltIns.anyType)
+            parent = irFile
+            declarations.addAll(fileClassMembers)
+            // TODO: figure out why reparenting leads to failing tests.
+            // fileClassMembers.forEach { it.parent = this }
+        }
+        // TODO file annotations
+    }
 }
 

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

@@ -6,25 +6,30 @@
 package org.jetbrains.kotlin.backend.jvm.lower
 
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.backend.common.utils.isSubtypeOf
+import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
 import org.jetbrains.kotlin.ir.declarations.IrFile
-import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.expressions.IrCall
 import org.jetbrains.kotlin.ir.expressions.IrExpression
+import org.jetbrains.kotlin.ir.types.toKotlinType
 import org.jetbrains.kotlin.ir.util.TypeTranslator
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 import org.jetbrains.kotlin.psi2ir.transformations.InsertImplicitCasts
 
-class JvmCoercionToUnitPatcher(builtIns: KotlinBuiltIns, irBuiltIns: IrBuiltIns, typeTranslator: TypeTranslator) :
-    InsertImplicitCasts(builtIns, irBuiltIns, typeTranslator), FileLoweringPass {
+class JvmCoercionToUnitPatcher(val context: JvmBackendContext) :
+    InsertImplicitCasts(
+        context.builtIns, context.irBuiltIns,
+        TypeTranslator(context.ir.symbols.externalSymbolTable, context.state.languageVersionSettings)
+    ),
+    FileLoweringPass {
 
     override fun lower(irFile: IrFile) {
         irFile.transformChildrenVoid(this)
     }
 
     override fun IrExpression.coerceToUnit(): IrExpression {
-        if (isUnitSubtype(getKotlinType(this)) && this is IrCall) {
-            return coerceToUnitIfNeeded(this.symbol.descriptor.original.returnType!!)
+        if (type.isSubtypeOf(context.irBuiltIns.unitType) && this is IrCall) {
+            return coerceToUnitIfNeeded(symbol.owner.returnType.toKotlinType())
         }
 
         return this