Reflection: add API for declaration modifiers

#KT-10447 Fixed

core/runtime.jvm/src/kotlin/jvm/internal/CallableReference.java

@@ -99,6 +99,21 @@ public abstract class CallableReference implements KCallable {
         return getReflected().callBy(args);
     }
 
+    @Override
+    public boolean isFinal() {
+        return getReflected().isFinal();
+    }
+
+    @Override
+    public boolean isOpen() {
+        return getReflected().isOpen();
+    }
+
+    @Override
+    public boolean isAbstract() {
+        return getReflected().isAbstract();
+    }
+
     public KCallable compute() {
         if (reflected == null) {
             reflected = computeReflected();

core/runtime.jvm/src/kotlin/jvm/internal/ClassReference.kt

@@ -48,6 +48,27 @@ class ClassReference(override val jClass: Class<*>) : KClass<Any>, ClassBasedDec
     override val supertypes: List<KType>
         get() = error()
 
+    override val isFinal: Boolean
+        get() = error()
+
+    override val isOpen: Boolean
+        get() = error()
+
+    override val isAbstract: Boolean
+        get() = error()
+
+    override val isSealed: Boolean
+        get() = error()
+
+    override val isData: Boolean
+        get() = error()
+
+    override val isInner: Boolean
+        get() = error()
+
+    override val isCompanion: Boolean
+        get() = error()
+
     private fun error(): Nothing = throw KotlinReflectionNotSupportedError()
 
     override fun equals(other: Any?) =

core/runtime.jvm/src/kotlin/jvm/internal/FunctionReference.java

@@ -84,6 +84,51 @@ public class FunctionReference extends FunctionImpl implements KFunction {
         return getReflected().callBy(args);
     }
 
+    @Override
+    public boolean isFinal() {
+        return getReflected().isFinal();
+    }
+
+    @Override
+    public boolean isOpen() {
+        return getReflected().isOpen();
+    }
+
+    @Override
+    public boolean isAbstract() {
+        return getReflected().isAbstract();
+    }
+
+    @Override
+    public boolean isInline() {
+        return getReflected().isInline();
+    }
+
+    @Override
+    public boolean isExternal() {
+        return getReflected().isExternal();
+    }
+
+    @Override
+    public boolean isOperator() {
+        return getReflected().isOperator();
+    }
+
+    @Override
+    public boolean isInfix() {
+        return getReflected().isInfix();
+    }
+
+    @Override
+    public boolean isTailrec() {
+        return getReflected().isTailrec();
+    }
+
+    @Override
+    public boolean isSuspend() {
+        return getReflected().isSuspend();
+    }
+
     @Override
     public boolean equals(Object obj) {
         if (obj == this) return true;

core/runtime.jvm/src/kotlin/jvm/internal/PropertyReference.java

@@ -19,6 +19,21 @@ package kotlin.jvm.internal;
 import kotlin.reflect.KProperty;
 
 public abstract class PropertyReference extends CallableReference implements KProperty {
+    @Override
+    protected KProperty getReflected() {
+        return (KProperty) super.getReflected();
+    }
+
+    @Override
+    public boolean isLateinit() {
+        return getReflected().isLateinit();
+    }
+
+    @Override
+    public boolean isConst() {
+        return getReflected().isConst();
+    }
+
     @Override
     public boolean equals(Object obj) {
         if (obj == this) return true;