KT-1973 Added class kind to JetClass annotations to distinguish object declarations and regular classes.

#KT-1973 in progress

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

@@ -112,6 +112,10 @@ public class CodegenUtil {
         return 0;
     }
 
+    public static int getFlagsForClassKind(@NotNull ClassDescriptor descriptor) {
+        return descriptor.getKind() == ClassKind.OBJECT ? JvmStdlibNames.FLAG_CLASS_KIND_OBJECT : JvmStdlibNames.FLAG_CLASS_KIND_DEFAULT;
+    }
+
     @NotNull
     public static JvmClassName getInternalClassName(FunctionDescriptor descriptor) {
         final int paramCount = descriptor.getValueParameters().size();

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

@@ -250,7 +250,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
         if (signature.getKotlinGenericSignature() != null || descriptor.getVisibility() != Visibilities.PUBLIC) {
             AnnotationVisitor annotationVisitor = v.newAnnotation(JvmStdlibNames.JET_CLASS.getDescriptor(), true);
             annotationVisitor.visit(JvmStdlibNames.JET_CLASS_SIGNATURE, signature.getKotlinGenericSignature());
-            int flags = getFlagsForVisibility(descriptor.getVisibility());
+            int flags = getFlagsForVisibility(descriptor.getVisibility()) | getFlagsForClassKind(descriptor);
             if (JvmStdlibNames.FLAGS_DEFAULT_VALUE != flags) {
                 annotationVisitor.visit(JvmStdlibNames.JET_FLAGS_FIELD, flags);
             }

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/JvmStdlibNames.java

@@ -57,6 +57,10 @@ public class JvmStdlibNames {
     public static final int FLAG_METHOD_KIND_DELEGATION =    2 << 5;
     public static final int FLAG_METHOD_KIND_SYNTHESIZED =   3 << 5;
 
+    public static final int FLAG_CLASS_KIND_MASK = 7 << 5;
+    public static final int FLAG_CLASS_KIND_DEFAULT = 0 << 5;
+    public static final int FLAG_CLASS_KIND_OBJECT = 1 << 5;
+
     public static final JvmClassName JET_CONSTRUCTOR = JvmClassName.byFqNameWithoutInnerClasses("jet.runtime.typeinfo.JetConstructor");
 
     /**

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/kt/JetClassAnnotation.java

@@ -50,6 +50,10 @@ public class JetClassAnnotation extends PsiAnnotationWithFlags {
         return signature;
     }
 
+    public int kind() {
+        return flags() & JvmStdlibNames.FLAG_CLASS_KIND_MASK;
+    }
+
     @NotNull
     public static JetClassAnnotation get(PsiClass psiClass) {
         final PsiAnnotation annotation = JavaDescriptorResolver.findAnnotation(psiClass, JvmStdlibNames.JET_CLASS.getFqName().getFqName());