Fix KClassValue behavior for reified type parameter literals

#KT-27799 Open

compiler/testData/diagnostics/tests/classLiteral/inAnnotationArguments.kt

@@ -32,4 +32,7 @@ fun test6() {}
 fun test7() {}
 
 @AnnArray(arrayOf(<!ANNOTATION_ARGUMENT_MUST_BE_KCLASS_LITERAL!>""::class<!>, String::class, AnObject::class))
-fun test8() {}
+fun test8() {}
+
+inline val <reified T> T.test9
+    get() = @Ann(T::class) object {}

compiler/testData/diagnostics/tests/classLiteral/inAnnotationArguments.txt

@@ -1,5 +1,6 @@
 package
 
+public val </*0*/ reified T> T.test9: kotlin.Any
 public fun foo(): kotlin.String
 @Ann(k = kotlin.String::class) public fun test1(): kotlin.Unit
 @Ann(k = kotlin.String::class) public fun test2(): kotlin.Unit

compiler/testData/ir/irText/declarations/annotations/classLiteralInAnnotation.txt

@@ -59,7 +59,7 @@ FILE fqName:<root> fileName:/classLiteralInAnnotation.kt
           CLASS CLASS name:<no name provided> modality:FINAL visibility:local flags: superTypes:[kotlin.Any]
             annotations:
               CALL 'constructor A(KClass<*>)' type=A origin=null
-                klass: CLASS_REFERENCE '<reified T>' type=kotlin.reflect.KClass<T>
+                klass: CLASS_REFERENCE 'Any' type=kotlin.reflect.KClass<kotlin.Any>
             $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:test2.<no name provided><T> flags:
             CONSTRUCTOR visibility:public <> () returnType:test2.<no name provided><T> flags:primary
               BLOCK_BODY
@@ -90,7 +90,7 @@ FILE fqName:<root> fileName:/classLiteralInAnnotation.kt
             CLASS CLASS name:<no name provided> modality:FINAL visibility:local flags: superTypes:[kotlin.Any]
               annotations:
                 CALL 'constructor A(KClass<*>)' type=A origin=null
-                  klass: CLASS_REFERENCE '<reified T>' type=kotlin.reflect.KClass<T>
+                  klass: CLASS_REFERENCE 'Any' type=kotlin.reflect.KClass<kotlin.Any>
               $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<get-test3>.<no name provided> flags:
               CONSTRUCTOR visibility:public <> () returnType:<get-test3>.<no name provided> flags:primary
                 BLOCK_BODY
@@ -122,7 +122,7 @@ FILE fqName:<root> fileName:/classLiteralInAnnotation.kt
             CLASS CLASS name:<no name provided> modality:FINAL visibility:local flags: superTypes:[kotlin.Any]
               annotations:
                 CALL 'constructor A(KClass<*>)' type=A origin=null
-                  klass: CLASS_REFERENCE '<reified T>' type=kotlin.reflect.KClass<T>
+                  klass: CLASS_REFERENCE 'Any' type=kotlin.reflect.KClass<kotlin.Any>
               $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<set-test3>.<no name provided> flags:
               CONSTRUCTOR visibility:public <> () returnType:<set-test3>.<no name provided> flags:primary
                 BLOCK_BODY
@@ -142,4 +142,3 @@ FILE fqName:<root> fileName:/classLiteralInAnnotation.kt
                   FUN IR_EXTERNAL_DECLARATION_STUB name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String flags:
                 $this: VALUE_PARAMETER name:<this> type:kotlin.Any flags:
             CALL 'constructor <no name provided>()' type=<set-test3>.<no name provided> origin=OBJECT_LITERAL
-

core/descriptors/src/org/jetbrains/kotlin/resolve/constants/constantValues.kt

@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.resolve.constants
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationArgumentVisitor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
@@ -193,9 +194,20 @@ class KClassValue(value: ClassLiteralValue) : ConstantValue<ClassLiteralValue>(v
                 arrayDimensions++
             }
 
-            val descriptor = type.constructor.declarationDescriptor as? ClassDescriptor ?: return null
-            val classId = descriptor.classId ?: return null
-            return KClassValue(classId, arrayDimensions)
+            return when (val descriptor = type.constructor.declarationDescriptor) {
+                is ClassDescriptor -> {
+                    val classId = descriptor.classId ?: return null
+                    KClassValue(classId, arrayDimensions)
+                }
+                is TypeParameterDescriptor -> {
+                    // This is possible if a reified type parameter is used in annotation on a local class / anonymous object.
+                    // In JVM class file, we can't represent such literal properly, so we're writing java.lang.Object instead.
+                    // This has no effect on the compiler front-end or other back-ends, so we use kotlin.Any for simplicity here.
+                    // Overall, it looks like such code should be disallowed: https://youtrack.jetbrains.com/issue/KT-27799
+                    KClassValue(ClassId.topLevel(KotlinBuiltIns.FQ_NAMES.any.toSafe()), 0)
+                }
+                else -> null
+            }
         }
     }
 }