Partially reimplement KotlinType based util using IrType

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/utils/kotlinTypeBasedUtils.kt

@@ -21,24 +21,12 @@ import org.jetbrains.kotlin.types.typeUtil.isTypeParameter
 
 // TODO: implement pure Ir-based function (see IrTypeUtils.kt)
 
-@Deprecated("Use pure Ir helper")
-fun IrType.isNullable() = toKotlinType().isNullable()
-
-@Deprecated("Use pure Ir helper")
-fun IrType.isInterface() = toKotlinType().isInterface()
-
 @Deprecated("Use pure Ir helper")
 fun IrType.isPrimitiveArray() = KotlinBuiltIns.isPrimitiveArray(toKotlinType())
 
 @Deprecated("Use pure Ir helper")
 fun IrType.getPrimitiveArrayElementType() = KotlinBuiltIns.getPrimitiveArrayElementType(toKotlinType())
 
-@Deprecated("Use pure Ir helper")
-fun IrType.isTypeParameter() = toKotlinType().isTypeParameter()
-
-@Deprecated("Use pure Ir helper")
-fun IrType.isFunctionOrKFunction() = toKotlinType().isFunctionOrKFunctionType
-
 @Deprecated("Use pure Ir helper")
 fun List<IrType>.commonSupertype() = CommonSupertypes.commonSupertype(map(IrType::toKotlinType)).toIrType()!!
 
@@ -47,6 +35,3 @@ fun IrType.isSubtypeOf(superType: IrType) = toKotlinType().isSubtypeOf(superType
 
 @Deprecated("Use pure Ir helper")
 fun IrType.isSubtypeOfClass(superClass: IrClassSymbol) = DescriptorUtils.isSubtypeOfClass(toKotlinType(), superClass.descriptor)
-
-@Deprecated("Use pure Ir helper")
-fun IrType.isBuiltinFunctionalTypeOrSubtype() = toKotlinType().isBuiltinFunctionalTypeOrSubtype

compiler/ir/backend.common/src/org/jetbrains/kotlin/ir/util/IrTypeUtils.kt

@@ -5,37 +5,72 @@
 
 package org.jetbrains.kotlin.ir.util
 
+import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
 import org.jetbrains.kotlin.ir.declarations.IrTypeParameter
-import org.jetbrains.kotlin.ir.types.IrType
-import org.jetbrains.kotlin.ir.types.classifierOrNull
+import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
+import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
+import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.utils.DFS
 
+val kotlinPackageFqn = FqName.fromSegments(listOf("kotlin"))
+val kotlinReflectionPackageFqn = kotlinPackageFqn.child(Name.identifier("reflection"))
 
-fun IrType.isFunctionTypeOrSubtype(): Boolean {
+fun IrType.isFunction(): Boolean {
+    val classifier = classifierOrNull ?: return false
+    val name = classifier.descriptor.name.asString()
+    if (!name.startsWith("Function")) return false
+    val declaration = classifier.owner as IrDeclaration
+    val parent = declaration.parent as? IrPackageFragment ?: return false
 
-    val kotlinPackageFqn = FqName.fromSegments(listOf("kotlin"))
-    fun checkType(irType: IrType): Boolean {
-        val classifier = irType.classifierOrNull ?: return false
-        val name = classifier.descriptor.name.asString()
-        if (!name.startsWith("Function")) return false
-        val declaration = classifier.owner as IrDeclaration
-        val parent = declaration.parent as? IrPackageFragment ?: return false
+    return parent.fqName == kotlinPackageFqn
+}
 
-        return parent.fqName == kotlinPackageFqn
+
+fun IrType.isKFunction(): Boolean {
+    val classifier = classifierOrNull ?: return false
+    val name = classifier.descriptor.name.asString()
+    if (!name.startsWith("KFunction")) return false
+    val declaration = classifier.owner as IrDeclaration
+    val parent = declaration.parent as? IrPackageFragment ?: return false
+
+    return parent.fqName == kotlinReflectionPackageFqn
+}
+
+
+fun IrType.superTypes(): List<IrType> {
+    val classifier = classifierOrNull?.owner ?: return emptyList()
+    return when(classifier) {
+        is IrClass -> classifier.superTypes
+        is IrTypeParameter -> classifier.superTypes
+        else -> throw IllegalStateException()
     }
+}
 
-    fun superTypes(irType: IrType): List<IrType> {
-        val classifier = irType.classifierOrNull?.owner ?: return emptyList()
-        return when(classifier) {
-            is IrClass -> classifier.superTypes
-            is IrTypeParameter -> classifier.superTypes
-            else -> throw IllegalStateException()
-        }
+fun IrType.typeParameterSuperTypes(): List<IrType> {
+    val classifier = classifierOrNull ?: return emptyList()
+    return when(classifier) {
+        is IrTypeParameterSymbol -> classifier.owner.superTypes
+        is IrClassSymbol -> emptyList()
+        else -> throw IllegalStateException()
     }
+}
 
-    return DFS.ifAny(listOf(this), ::superTypes, ::checkType)
-}
+fun IrType.isFunctionTypeOrSubtype(): Boolean = DFS.ifAny(listOf(this), { it.superTypes() }, { it.isFunction() })
+
+fun IrType.isTypeParameter() = classifierOrNull is IrTypeParameterSymbol
+
+fun IrType.isInterface() = (classifierOrNull?.owner as? IrClass)?.kind == ClassKind.INTERFACE
+
+fun IrType.isFunctionOrKFunction() = isFunction() || isKFunction()
+
+fun IrType.isNullable(): Boolean = DFS.ifAny(listOf(this), { it.typeParameterSuperTypes() }, {
+    when (it) {
+        is IrSimpleType -> it.hasQuestionMark
+        else -> it is IrDynamicType
+    }
+})

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/IntrinsicifyCallsLowering.kt

@@ -6,7 +6,6 @@
 package org.jetbrains.kotlin.ir.backend.js.lower
 
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
-import org.jetbrains.kotlin.backend.common.utils.isNullable
 import org.jetbrains.kotlin.backend.common.utils.isSubtypeOf
 import org.jetbrains.kotlin.backend.common.utils.isSubtypeOfClass
 import org.jetbrains.kotlin.descriptors.PropertyAccessorDescriptor

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/TypeOperatorLowering.kt

@@ -22,6 +22,10 @@ import org.jetbrains.kotlin.ir.expressions.impl.IrCompositeImpl
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
 import org.jetbrains.kotlin.ir.types.*
+import org.jetbrains.kotlin.ir.util.isFunctionOrKFunction
+import org.jetbrains.kotlin.ir.util.isInterface
+import org.jetbrains.kotlin.ir.util.isNullable
+import org.jetbrains.kotlin.ir.util.isTypeParameter
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 
 class TypeOperatorLowering(val context: JsIrBackendContext) : FileLoweringPass {