Fix loading class literal value void.class in reflection

#KT-27878 Fixed

compiler/testData/codegen/box/reflection/annotations/classLiteralWithVoidDefault.kt

@@ -0,0 +1,29 @@
+// WITH_REFLECT
+// TARGET_BACKEND: JVM
+// FILE: Anno.java
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Anno {
+    Class<?> value() default void.class;
+}
+
+// FILE: test.kt
+
+import kotlin.test.assertEquals
+
+class C {
+    @Anno
+    fun f1() {}
+
+    @Anno(Void::class)
+    fun f2() {}
+}
+
+fun box(): String {
+    assertEquals("[@Anno(value=void)]", C::f1.annotations.toString())
+    assertEquals("[@Anno(value=class java.lang.Void)]", C::f2.annotations.toString())
+    return "OK"
+}

compiler/testData/loadJava/compiledJava/annotations/ClassObjectArrayInParam.java

@@ -5,6 +5,14 @@ public class ClassObjectArrayInParam {
         Class<?>[] value();
     }
 
-    @Anno({ClassObjectArrayInParam.class, Nested.class, String.class, java.util.List.class, String[][].class, int[][].class})
+    @Anno({
+            ClassObjectArrayInParam.class,
+            Nested.class,
+            String.class,
+            java.util.List.class,
+            String[][].class,
+            int[][].class,
+            void.class
+    })
     public static class Nested {}
 }

compiler/testData/loadJava/compiledJava/annotations/ClassObjectArrayInParam.txt

@@ -8,7 +8,7 @@ public open class ClassObjectArrayInParam {
         public final val value: kotlin.Array<kotlin.reflect.KClass<*>>
     }
 
-    @test.ClassObjectArrayInParam.Anno(value = {test.ClassObjectArrayInParam::class, test.ClassObjectArrayInParam.Nested::class, kotlin.String::class, kotlin.collections.MutableList::class, kotlin.Array<kotlin.Array<kotlin.String>>::class, kotlin.Array<kotlin.IntArray>::class}) public open class Nested {
+    @test.ClassObjectArrayInParam.Anno(value = {test.ClassObjectArrayInParam::class, test.ClassObjectArrayInParam.Nested::class, kotlin.String::class, kotlin.collections.MutableList::class, kotlin.Array<kotlin.Array<kotlin.String>>::class, kotlin.Array<kotlin.IntArray>::class, kotlin.Unit::class}) public open class Nested {
         public constructor Nested()
     }
 }

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -18914,6 +18914,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 runTest("compiler/testData/codegen/box/reflection/annotations/annotationsOnJavaMembers.kt");
             }
 
+            @TestMetadata("classLiteralWithVoidDefault.kt")
+            public void testClassLiteralWithVoidDefault() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/annotations/classLiteralWithVoidDefault.kt");
+            }
+
             @TestMetadata("findAnnotation.kt")
             public void testFindAnnotation() throws Exception {
                 runTest("compiler/testData/codegen/box/reflection/annotations/findAnnotation.kt");

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -18914,6 +18914,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
                 runTest("compiler/testData/codegen/box/reflection/annotations/annotationsOnJavaMembers.kt");
             }
 
+            @TestMetadata("classLiteralWithVoidDefault.kt")
+            public void testClassLiteralWithVoidDefault() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/annotations/classLiteralWithVoidDefault.kt");
+            }
+
             @TestMetadata("findAnnotation.kt")
             public void testFindAnnotation() throws Exception {
                 runTest("compiler/testData/codegen/box/reflection/annotations/findAnnotation.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -18919,6 +18919,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 runTest("compiler/testData/codegen/box/reflection/annotations/annotationsOnJavaMembers.kt");
             }
 
+            @TestMetadata("classLiteralWithVoidDefault.kt")
+            public void testClassLiteralWithVoidDefault() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/annotations/classLiteralWithVoidDefault.kt");
+            }
+
             @TestMetadata("findAnnotation.kt")
             public void testFindAnnotation() throws Exception {
                 runTest("compiler/testData/codegen/box/reflection/annotations/findAnnotation.kt");

core/descriptors.runtime/src/kotlin/reflect/jvm/internal/components/ReflectKotlinClass.kt

@@ -16,11 +16,13 @@
 
 package kotlin.reflect.jvm.internal.components
 
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.builtins.jvm.JavaToKotlinClassMap
 import org.jetbrains.kotlin.load.kotlin.KotlinJvmBinaryClass
 import org.jetbrains.kotlin.load.kotlin.header.KotlinClassHeader
 import org.jetbrains.kotlin.load.kotlin.header.ReadKotlinClassHeaderAnnotationVisitor
 import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.constants.ClassLiteralValue
 import org.jetbrains.kotlin.resolve.jvm.JvmPrimitiveType
@@ -195,6 +197,11 @@ private object ReflectClassStructure {
             currentClass = currentClass.componentType
         }
         if (currentClass.isPrimitive) {
+            if (currentClass == Void.TYPE) {
+                // void.class is not representable in Kotlin, we approximate it by Unit::class
+                return ClassLiteralValue(ClassId.topLevel(KotlinBuiltIns.FQ_NAMES.unit.toSafe()), dimensions)
+            }
+
             val primitiveType = JvmPrimitiveType.get(currentClass.name).primitiveType
             if (dimensions > 0) {
                 return ClassLiteralValue(ClassId.topLevel(primitiveType.arrayTypeFqName), dimensions - 1)