Move properties of enum class object to the enum class

Similar to how it's done for usual classes

compiler/backend/src/org/jetbrains/jet/codegen/AsmUtil.java

@@ -667,14 +667,17 @@ public class AsmUtil {
 
     public static boolean isPropertyWithBackingFieldCopyInOuterClass(@NotNull PropertyDescriptor propertyDescriptor) {
         boolean isExtensionProperty = propertyDescriptor.getReceiverParameter() != null;
-        return !propertyDescriptor.isVar() && !isExtensionProperty
+        DeclarationDescriptor propertyContainer = propertyDescriptor.getContainingDeclaration();
-               && isClassObjectOfClassWithKind(propertyDescriptor.getContainingDeclaration(), ClassKind.TRAIT)
+        return !propertyDescriptor.isVar()
+               && !isExtensionProperty
+               && isClassObject(propertyContainer) && isTrait(propertyContainer.getContainingDeclaration())
                && areBothAccessorDefault(propertyDescriptor)
                && getVisibilityForSpecialPropertyBackingField(propertyDescriptor, false) == ACC_PUBLIC;
     }
 
     public static boolean isClassObjectWithBackingFieldsInOuter(@NotNull DeclarationDescriptor classObject) {
-        return isClassObjectOfClassWithKind(classObject, ClassKind.CLASS);
+        DeclarationDescriptor containingClass = classObject.getContainingDeclaration();
+        return isClassObject(classObject) && (isClass(containingClass) || isEnumClass(containingClass));
     }
 
     private static boolean areBothAccessorDefault(@NotNull PropertyDescriptor propertyDescriptor) {
@@ -686,10 +689,6 @@ public class AsmUtil {
         return accessorDescriptor == null || !accessorDescriptor.hasBody();
     }
 
-    private static boolean isClassObjectOfClassWithKind(@NotNull DeclarationDescriptor classObject, @NotNull ClassKind kind) {
-        return isClassObject(classObject) && isKindOf(classObject.getContainingDeclaration(), kind);
-    }
-
     public static Type comparisonOperandType(Type left, Type right) {
         if (left == Type.DOUBLE_TYPE || right == Type.DOUBLE_TYPE) return Type.DOUBLE_TYPE;
         if (left == Type.FLOAT_TYPE || right == Type.FLOAT_TYPE) return Type.FLOAT_TYPE;

compiler/testData/codegen/box/enum/classObjectInEnum.kt

@@ -11,7 +11,7 @@ enum class Game {
 
 fun box(): String {
     if (Game.foo() != Game.ROCK) return "Fail 1"
-    // TODO: fix initialization order and uncomment
+    // TODO: fix initialization order and uncomment (KT-5761)
     // if (Game.bar != Game.PAPER) return "Fail 2: ${Game.bar}"
     if (Game.values().size != 3) return "Fail 3"
     if (Game.valueOf("SCISSORS") != Game.SCISSORS) return "Fail 4"

compiler/testData/codegen/boxWithJava/properties/classObjectProperties/Test.java

@@ -0,0 +1,16 @@
+class Test {
+    String test() {
+        String s;
+
+        s = Klass.NAME;
+        if (!s.equals("Klass")) throw new AssertionError("Fail class: " + s);
+
+        s = Trait.NAME;
+        if (!s.equals("Trait")) throw new AssertionError("Fail trait: " + s);
+
+        s = Enoom.NAME;
+        if (!s.equals("Enoom")) throw new AssertionError("Fail enum: " + s);
+
+        return "OK";
+    }
+}

compiler/testData/codegen/boxWithJava/properties/classObjectProperties/classObjectProperties.kt

@@ -0,0 +1,19 @@
+class Klass {
+    class object {
+        val NAME = "Klass"
+    }
+}
+
+trait Trait {
+    class object {
+        val NAME = "Trait"
+    }
+}
+
+enum class Enoom {
+    class object {
+        val NAME = "Enoom"
+    }
+}
+
+fun box() = Test().test()

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxWithJavaCodegenTestGenerated.java

@@ -32,7 +32,7 @@ import java.util.regex.Pattern;
 @SuppressWarnings("all")
 @TestMetadata("compiler/testData/codegen/boxWithJava")
 @TestDataPath("$PROJECT_ROOT")
-@InnerTestClasses({BlackBoxWithJavaCodegenTestGenerated.PlatformStatic.class})
+@InnerTestClasses({BlackBoxWithJavaCodegenTestGenerated.PlatformStatic.class, BlackBoxWithJavaCodegenTestGenerated.Properties.class})
 @RunWith(org.jetbrains.jet.JUnit3RunnerWithInners.class)
 public class BlackBoxWithJavaCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
     public void testAllFilesPresentInBoxWithJava() throws Exception {
@@ -74,4 +74,21 @@ public class BlackBoxWithJavaCodegenTestGenerated extends AbstractBlackBoxCodege
         
     }
     
+    @TestMetadata("compiler/testData/codegen/boxWithJava/properties")
+    @TestDataPath("$PROJECT_ROOT")
+    @InnerTestClasses({})
+    @RunWith(org.jetbrains.jet.JUnit3RunnerWithInners.class)
+    public static class Properties extends AbstractBlackBoxCodegenTest {
+        public void testAllFilesPresentInProperties() throws Exception {
+            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/boxWithJava/properties"), Pattern.compile("^([^\\.]+)$"), true);
+        }
+        
+        @TestMetadata("classObjectProperties")
+        public void testClassObjectProperties() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithJava/properties/classObjectProperties/");
+            doTestWithJava(fileName);
+        }
+        
+    }
+    
 }