KT-4107 Data objects

compiler/testData/codegen/box/dataObjects/equals.kt

@@ -0,0 +1,15 @@
+// LANGUAGE: +DataObjects
+// WITH_STDLIB
+
+package com.example
+
+import kotlin.test.*
+
+data object DataObject
+
+fun box(): String {
+    assertEquals(DataObject, DataObject)
+    assertFalse(DataObject == null)
+
+    return  "OK"
+}

compiler/testData/codegen/box/dataObjects/hashCode.kt

@@ -0,0 +1,19 @@
+// LANGUAGE: +DataObjects
+// WITH_STDLIB
+
+package com.example
+
+import kotlin.test.*
+
+data object DataObject {
+    data object Inner
+}
+
+fun box(): String {
+    assertEquals(DataObject.hashCode(), DataObject.hashCode())
+    assertNotEquals(DataObject.hashCode(), DataObject.Inner.hashCode())
+    assertNotEquals(0, DataObject.hashCode())
+    assertNotEquals(0, DataObject.Inner.hashCode())
+
+    return "OK"
+}

compiler/testData/codegen/box/dataObjects/multipleInstances.kt

@@ -0,0 +1,18 @@
+// LANGUAGE: +DataObjects
+// WITH_STDLIB
+// TARGET_BACKEND: JVM_IR
+
+import kotlin.test.*
+
+data object DataObject
+
+val doppelganger = DataObject::class.java.declaredConstructors[0].apply { isAccessible = true }.newInstance()
+
+fun box(): String {
+    assertFalse(DataObject === doppelganger)
+    assertEquals(DataObject, doppelganger)
+    assertEquals(DataObject.hashCode(), DataObject::class.java.cast(doppelganger).hashCode())
+
+    return  "OK"
+}
+

compiler/testData/codegen/box/dataObjects/serialization.kt

@@ -0,0 +1,19 @@
+// LANGUAGE: +DataObjects
+// WITH_STDLIB
+// TARGET_BACKEND: JVM_IR
+// FULL_JDK
+// CHECK_BYTECODE_LISTING
+
+import java.io.*
+
+data object NonSerializableDataObject
+
+data object SerializableDataObject: Serializable
+
+fun box(): String {
+    ByteArrayOutputStream().use { baos ->
+        ObjectOutputStream(baos).use { oos -> oos.writeObject(SerializableDataObject) }
+        ByteArrayInputStream(baos.toByteArray()).use { bais -> assert(java.io.ObjectInputStream(bais).readObject() === SerializableDataObject) }
+    }
+    return "OK"
+}

compiler/testData/codegen/box/dataObjects/serialization.txt

@@ -0,0 +1,28 @@
+@kotlin.Metadata
+public final class NonSerializableDataObject {
+    // source: 'serialization.kt'
+    public final static @org.jetbrains.annotations.NotNull field INSTANCE: NonSerializableDataObject
+    static method <clinit>(): void
+    private method <init>(): void
+    public method equals(@org.jetbrains.annotations.Nullable p0: java.lang.Object): boolean
+    public method hashCode(): int
+    public @org.jetbrains.annotations.NotNull method toString(): java.lang.String
+}
+
+@kotlin.Metadata
+public final class SerializableDataObject {
+    // source: 'serialization.kt'
+    public final static @org.jetbrains.annotations.NotNull field INSTANCE: SerializableDataObject
+    static method <clinit>(): void
+    private method <init>(): void
+    public method equals(@org.jetbrains.annotations.Nullable p0: java.lang.Object): boolean
+    public method hashCode(): int
+    private final method readResolve(): java.lang.Object
+    public @org.jetbrains.annotations.NotNull method toString(): java.lang.String
+}
+
+@kotlin.Metadata
+public final class SerializationKt {
+    // source: 'serialization.kt'
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+}

compiler/testData/codegen/box/dataObjects/toString.kt

@@ -0,0 +1,52 @@
+// LANGUAGE: +DataObjects
+// WITH_STDLIB
+
+package com.example
+
+import kotlin.test.*
+
+data object DataObject {
+    data object Nested
+}
+
+class Foo {
+    data object Inner
+}
+
+data object Declared {
+    override fun toString() = "Overriden"
+}
+
+open class WithFinalToString {
+    final override fun toString() = "FinalToString"
+}
+
+data object InheritedFromClassWithFinalToString: WithFinalToString()
+
+open class WithOpenToString {
+    override fun toString() = "OpenToString"
+}
+
+data object InheritedFromClassWithOpenToString: WithOpenToString()
+
+abstract class WithAbstractToString {
+    abstract override fun toString(): String
+}
+
+data object InheritedFromClassWithAbstractToString : WithAbstractToString()
+
+class C {
+    companion object CC
+}
+
+fun box(): String {
+    assertEquals("DataObject", DataObject.toString())
+    assertEquals("Nested", DataObject.Nested.toString())
+    assertEquals("Inner", Foo.Inner.toString())
+    assertEquals("Overriden", Declared.toString())
+    assertEquals("FinalToString", InheritedFromClassWithFinalToString.toString())
+    assertEquals("InheritedFromClassWithOpenToString", InheritedFromClassWithOpenToString.toString())
+    assertEquals("InheritedFromClassWithAbstractToString", InheritedFromClassWithAbstractToString.toString())
+
+    return "OK"
+}

compiler/testData/diagnostics/tests/dataClasses/companionDataObject.kt

@@ -0,0 +1,6 @@
+// FIR_IDENTICAL
+// LANGUAGE: +DataObjects
+
+class C {
+    companion <!WRONG_MODIFIER_TARGET!>data<!> object Object
+}

compiler/testData/diagnostics/tests/dataClasses/companionDataObject.txt

@@ -0,0 +1,16 @@
+package
+
+public final class C {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public data companion object Object {
+        private constructor Object()
+        public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+    }
+}
+

compiler/testData/diagnostics/tests/dataClasses/dataObject.kt

@@ -1,2 +0,0 @@
-// FIR_IDENTICAL
-<!WRONG_MODIFIER_TARGET!>data<!> object Object<!CONSTRUCTOR_IN_OBJECT!>(val x: Int, val y: Int)<!>

compiler/testData/diagnostics/tests/dataClasses/dataObject.txt

@@ -1,13 +0,0 @@
-package
-
-public data object Object {
-    private constructor Object(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int)
-    public final val x: kotlin.Int
-    public final val y: kotlin.Int
-    public final operator /*synthesized*/ fun component1(): kotlin.Int
-    public final operator /*synthesized*/ fun component2(): kotlin.Int
-    public final /*synthesized*/ fun copy(/*0*/ x: kotlin.Int = ..., /*1*/ y: kotlin.Int = ...): Object
-    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
-}

compiler/testData/diagnostics/tests/dataClasses/dataObjectDisabled.fir.kt

@@ -0,0 +1,2 @@
+// LANGUAGE: -DataObjects
+<!WRONG_MODIFIER_TARGET!>data<!> object Object

compiler/testData/diagnostics/tests/dataClasses/dataObjectDisabled.kt

@@ -0,0 +1,2 @@
+// LANGUAGE: -DataObjects
+<!UNSUPPORTED_FEATURE!>data<!> object Object

compiler/testData/diagnostics/tests/dataClasses/dataObjectDisabled.txt

@@ -0,0 +1,9 @@
+package
+
+public data object Object {
+    private constructor Object()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+

compiler/testData/diagnostics/tests/dataClasses/dataObjectEnabled.kt

@@ -0,0 +1,3 @@
+// LANGUAGE: +DataObjects
+// FIR_IDENTICAL
+data object Object

compiler/testData/diagnostics/tests/dataClasses/dataObjectEnabled.txt

@@ -0,0 +1,9 @@
+package
+
+public data object Object {
+    private constructor Object()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+

compiler/testData/diagnostics/tests/dataClasses/dataObjectLiteral.kt

@@ -0,0 +1,10 @@
+// FIR_IDENTICAL
+// LANGUAGE: +DataObjects
+
+interface I {
+    fun foo()
+}
+
+val o = <!UNRESOLVED_REFERENCE!>data<!><!SYNTAX!><!> object<!SYNTAX!><!>: I {
+    override fun foo() {}
+}

compiler/testData/diagnostics/tests/dataClasses/dataObjectLiteral.txt

@@ -0,0 +1,18 @@
+package
+
+public val o: [Error type: Not found recorded type for data]
+
+public object `<no name provided>` : I {
+    private constructor `<no name provided>`()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface I {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/dataClasses/strange.kt

@@ -3,8 +3,8 @@
     B(2)
 }
 
-<!WRONG_MODIFIER_TARGET!>data<!> object <!DATA_CLASS_WITHOUT_PARAMETERS!>Second<!>
+<!UNSUPPORTED_FEATURE!>data<!> object Second
 
-<!WRONG_MODIFIER_TARGET!>data<!> interface <!DATA_CLASS_WITHOUT_PARAMETERS!>Third<!>
+<!WRONG_MODIFIER_TARGET!>data<!> interface Third
 
-<!WRONG_MODIFIER_TARGET!>data<!> annotation class Fourth(val x: Int)
+<!WRONG_MODIFIER_TARGET!>data<!> annotation class Fourth(val x: Int)

compiler/testData/diagnostics/tests/dataClasses/strange.txt

@@ -11,8 +11,6 @@ public final data enum class First : kotlin.Enum<First> {
     public final val x: kotlin.Int
     protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
     public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: First): kotlin.Int
-    public final operator /*synthesized*/ fun component1(): kotlin.Int
-    public final /*synthesized*/ fun copy(/*0*/ x: kotlin.Int = ...): First
     public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     protected/*protected and package*/ final override /*1*/ /*fake_override*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun finalize(): kotlin.Unit
     public final override /*1*/ /*fake_override*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun getDeclaringClass(): java.lang.Class<First!>!
@@ -27,8 +25,6 @@ public final data enum class First : kotlin.Enum<First> {
 public final data annotation class Fourth : kotlin.Annotation {
     public constructor Fourth(/*0*/ x: kotlin.Int)
     public final val x: kotlin.Int
-    public final operator /*synthesized*/ fun component1(): kotlin.Int
-    public final /*synthesized*/ fun copy(/*0*/ x: kotlin.Int = ...): Fourth
     public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
@@ -36,7 +32,6 @@ public final data annotation class Fourth : kotlin.Annotation {
 
 public data object Second {
     private constructor Second()
-    public final /*synthesized*/ fun copy(): Second
     public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
@@ -47,3 +42,4 @@ public data interface Third {
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
+

compiler/testData/diagnostics/tests/dataObjects/overrideEqualsAndHashCode.kt

@@ -0,0 +1,44 @@
+// FIR_IDENTICAL
+// LANGUAGE: +DataObjects
+
+data object Override {
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun equals(other: Any?): Boolean {
+        return true
+    }
+
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun hashCode(): Int {
+        return 1
+    }
+}
+
+open class Base {
+    open fun hashCode(x: Int) = x
+}
+
+data object NoOverride: Base() {
+    fun equals(other: Any?, tag: Int): Boolean {
+        return true
+    }
+
+    fun hashCode(param: String): Int {
+        return 1
+    }
+
+    override fun hashCode(x: Int) = x + 1
+}
+
+open class Super {
+    override fun equals(other: Any?): Boolean {
+        return super.equals(other)
+    }
+
+    override fun hashCode(): Int {
+        return 1
+    }
+}
+
+data object OverridenInSuper: Super() {
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun equals(other: Any?): Boolean {
+        return super.equals(other)
+    }
+}

compiler/testData/diagnostics/tests/dataObjects/overrideEqualsAndHashCode.txt

@@ -0,0 +1,40 @@
+package
+
+public open class Base {
+    public constructor Base()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open fun hashCode(/*0*/ x: kotlin.Int): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public data object NoOverride : Base {
+    private constructor NoOverride()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun equals(/*0*/ other: kotlin.Any?, /*1*/ tag: kotlin.Int): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ fun hashCode(/*0*/ x: kotlin.Int): kotlin.Int
+    public final fun hashCode(/*0*/ param: kotlin.String): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public data object Override {
+    private constructor Override()
+    public open override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public data object OverridenInSuper : Super {
+    private constructor OverridenInSuper()
+    public open override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public open class Super {
+    public constructor Super()
+    public open override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJvmBackend/dataObjects/customReadResolve.kt

@@ -0,0 +1,16 @@
+// !LANGUAGE: +DataObjects
+// TARGET_BACKEND: JVM_IR
+
+import java.io.Serializable
+
+data <!CONFLICTING_JVM_DECLARATIONS!>object A<!> : Serializable {
+    <!CONFLICTING_JVM_DECLARATIONS!>private fun readResolve(): Any<!> = this
+}
+
+data object B : Serializable {
+    private fun readResolve(): B = this
+}
+
+data object C {
+    private fun readResolve(): Any = this
+}

compiler/testData/diagnostics/testsWithJvmBackend/dataObjects/customReadResolve.txt

@@ -0,0 +1,26 @@
+package
+
+public data object A : java.io.Serializable {
+    private constructor A()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    private final fun readResolve(): kotlin.Any
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public data object B : java.io.Serializable {
+    private constructor B()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    private final fun readResolve(): B
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public data object C {
+    private constructor C()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    private final fun readResolve(): kotlin.Any
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+

compiler/testData/ir/irText/declarations/parameters/dataClassMembers.fir.kt.txt

@@ -56,3 +56,4 @@ data class Test<T : Any?> {
   }
 
 }
+