Reflection: add API for declaration modifiers

#KT-10447 Fixed

core/builtins/src/kotlin/reflect/KCallable.kt

@@ -62,4 +62,19 @@ public interface KCallable<out R> : KAnnotatedElement {
      * or its type does not match the type of the provided value, an exception is thrown.
      */
     public fun callBy(args: Map<KParameter, Any?>): R
+
+    /**
+     * `true` if this callable is `final`.
+     */
+    public val isFinal: Boolean
+
+    /**
+     * `true` if this callable is `open`.
+     */
+    public val isOpen: Boolean
+
+    /**
+     * `true` if this callable is `abstract`.
+     */
+    public val isAbstract: Boolean
 }

core/builtins/src/kotlin/reflect/KClass.kt

@@ -73,6 +73,49 @@ public interface KClass<T : Any> : KDeclarationContainer, KAnnotatedElement, KCl
      */
     public val supertypes: List<KType>
 
+    /**
+     * `true` if this class is `final`.
+     */
+    public val isFinal: Boolean
+
+    /**
+     * `true` if this class is `open`.
+     */
+    public val isOpen: Boolean
+
+    /**
+     * `true` if this class is `abstract`.
+     */
+    public val isAbstract: Boolean
+
+    /**
+     * `true` if this class is `sealed`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/classes.html#sealed-classes)
+     * for more information.
+     */
+    public val isSealed: Boolean
+
+    /**
+     * `true` if this class is a data class.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/data-classes.html)
+     * for more information.
+     */
+    public val isData: Boolean
+
+    /**
+     * `true` if this class is an inner class.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/nested-classes.html#inner-classes)
+     * for more information.
+     */
+    public val isInner: Boolean
+
+    /**
+     * `true` if this class is a companion object.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/object-declarations.html#companion-objects)
+     * for more information.
+     */
+    public val isCompanion: Boolean
+
     /**
      * Returns `true` if [other] is a [KClass] instance representing the same class on a given platform.
      *

core/builtins/src/kotlin/reflect/KFunction.kt

@@ -19,4 +19,44 @@ package kotlin.reflect
 /**
  * Represents a function with introspection capabilities.
  */
-public interface KFunction<out R> : KCallable<R>, Function<R>
+public interface KFunction<out R> : KCallable<R>, Function<R> {
+    /**
+     * `true` if this function is `inline`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/inline-functions.html)
+     * for more information.
+     */
+    public val isInline: Boolean
+
+    /**
+     * `true` if this function is `external`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/java-interop.html#using-jni-with-kotlin)
+     * for more information.
+     */
+    public val isExternal: Boolean
+
+    /**
+     * `true` if this function is `operator`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/operator-overloading.html)
+     * for more information.
+     */
+    public val isOperator: Boolean
+
+    /**
+     * `true` if this function is `infix`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/functions.html#infix-notation)
+     * for more information.
+     */
+    public val isInfix: Boolean
+
+    /**
+     * `true` if this function is `tailrec`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/functions.html#tail-recursive-functions)
+     * for more information.
+     */
+    public val isTailrec: Boolean
+
+    /**
+     * `true` if this is a suspending function.
+     */
+    public val isSuspend: Boolean
+}

core/builtins/src/kotlin/reflect/KParameter.kt

@@ -69,4 +69,30 @@ public interface KParameter : KAnnotatedElement {
      * 2. The parameter is declared in a member function and one of the corresponding parameters in the super functions is optional.
      */
     public val isOptional: Boolean
+
+    /**
+     * `true` if this parameter is `vararg`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/functions.html#variable-number-of-arguments-varargs)
+     * for more information.
+     */
+    public val isVararg: Boolean
+
+    /**
+     * `true` if this parameter is `noinline`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/inline-functions.html#noinline)
+     * for more information.
+     */
+    public val isNoinline: Boolean
+
+    /**
+     * `true` if this parameter is `crossinline`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/inline-functions.html#non-local-returns)
+     * for more information.
+     */
+    public val isCrossinline: Boolean
+
+    /**
+     * `true` if this parameter is `coroutine`.
+     */
+    public val isCoroutine: Boolean
 }

core/builtins/src/kotlin/reflect/KProperty.kt

@@ -25,6 +25,20 @@ package kotlin.reflect
  * @param R the type of the property.
  */
 public interface KProperty<out R> : KCallable<R> {
+    /**
+     * `true` if this property is `lateinit`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/properties.html#late-initialized-properties)
+     * for more information.
+     */
+    public val isLateinit: Boolean
+
+    /**
+     * `true` if this property is `const`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/properties.html#compile-time-constants)
+     * for more information.
+     */
+    public val isConst: Boolean
+
     /** The getter of this property, used to obtain the value of the property. */
     public val getter: Getter<R>
 

core/builtins/src/kotlin/reflect/KTypeParameter.kt

@@ -40,4 +40,11 @@ public interface KTypeParameter : KClassifier {
      * for more information.
      */
     public val variance: KVariance
+
+    /**
+     * `true` if this type parameter is `reified`.
+     * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/inline-functions.html#reified-type-parameters)
+     * for more information.
+     */
+    public val isReified: Boolean
 }