Light classes: modifierList#findAnnotation does not trigger exact resolve

compiler/light-classes/src/org/jetbrains/kotlin/asJava/elements/KtLightModifierList.kt

@@ -49,7 +49,7 @@ abstract class KtLightModifierList<out T : KtLightElement<KtModifierListOwner, P
     override fun addAnnotation(qualifiedName: String) = clsDelegate.addAnnotation(qualifiedName)
     override fun getApplicableAnnotations(): Array<out PsiAnnotation> = annotations
     override fun getAnnotations(): Array<out PsiAnnotation> = _annotations.toTypedArray()
-    override fun findAnnotation(qualifiedName: String) = annotations.firstOrNull { it.qualifiedName == qualifiedName }
+    override fun findAnnotation(qualifiedName: String) = _annotations.firstOrNull { it.fqNameMatches(qualifiedName) }
     override fun getParent() = owner
     override fun getText(): String? = ""
     override fun getTextRange() = TextRange.EMPTY_RANGE
@@ -68,7 +68,7 @@ class KtLightSimpleModifierList(
     override fun copy() = KtLightSimpleModifierList(owner, modifiers)
 }
 
-private fun computeAnnotations(lightModifierList: KtLightModifierList<*>): List<PsiAnnotation> {
+private fun computeAnnotations(lightModifierList: KtLightModifierList<*>): List<KtLightAbstractAnnotation> {
     val annotationsForEntries = lightAnnotationsForEntries(lightModifierList)
     val modifierListOwner = lightModifierList.parent
     if (modifierListOwner is KtLightClassForSourceDeclaration && modifierListOwner.isAnnotationType) {

compiler/light-classes/src/org/jetbrains/kotlin/asJava/elements/lightAnnotations.kt

@@ -45,6 +45,8 @@ abstract class KtLightAbstractAnnotation(parent: PsiElement, computeDelegate: ()
     override fun getMetaData() = clsDelegate.metaData
 
     override fun getParameterList() = clsDelegate.parameterList
+
+    open fun fqNameMatches(fqName: String): Boolean = qualifiedName == fqName
 }
 
 class KtLightAnnotationForSourceEntry(
@@ -226,6 +228,12 @@ class KtLightNullabilityAnnotation(member: KtLightElement<*, PsiModifierListOwne
         isNullabilityAnnotation(it.qualifiedName)
     } ?: KtLightNonExistentAnnotation(member)
 }) {
+    override fun fqNameMatches(fqName: String): Boolean {
+        if (!isNullabilityAnnotation(fqName)) return false
+
+        return super.fqNameMatches(fqName)
+    }
+
     override val kotlinOrigin get() = null
     override fun <T : PsiAnnotationMemberValue?> setDeclaredAttributeValue(attributeName: String?, value: T?) = cannotModify()
 

idea/tests/org/jetbrains/kotlin/idea/caches/resolve/AbstractIdeLightClassTest.kt

@@ -279,6 +279,7 @@ object LightClassLazinessChecker {
     )
 
     private fun classInfo(psiClass: PsiClass) = with(psiClass) {
+        checkModifierList(modifierList!!)
         ClassInfo(fields.names(), methods.names(), PsiModifier.MODIFIERS.asList().filter { modifierList!!.hasModifierProperty(it) })
     }
 
@@ -288,7 +289,7 @@ object LightClassLazinessChecker {
     )
 
     private fun fieldInfo(field: PsiField) = with(field) {
-        modifierList?.annotations // check getting annotations list doesn't trigger exact resolve
+        checkModifierList(modifierList!!)
 
         FieldInfo(
                 name!!, PsiModifier.MODIFIERS.asList().filter { modifierList!!.hasModifierProperty(it) }
@@ -304,7 +305,7 @@ object LightClassLazinessChecker {
     )
 
     private fun methodInfo(method: PsiMethod, lazinessMode: Mode) = with(method) {
-        modifierList.annotations // check getting annotations list doesn't trigger exact resolve
+        checkModifierList(method.modifierList)
 
         MethodInfo(
                 name, relevantModifiers(lazinessMode),
@@ -323,6 +324,19 @@ object LightClassLazinessChecker {
         lazinessMode == Mode.NoLaziness || it !in visibilityModifiers
     }.filter { modifierList.hasModifierProperty(it) }
 
+    private fun checkModifierList(modifierList: PsiModifierList) {
+        // see org.jetbrains.kotlin.asJava.elements.KtLightNonSourceAnnotation
+        val isAnnotationClass = (modifierList.parent as? PsiClass)?.isAnnotationType ?: false
+
+        if (!isAnnotationClass) {
+            // check getting annotations list doesn't trigger exact resolve
+            modifierList.annotations
+
+            // check searching for non-existent annotation doesn't trigger exact resolve
+            modifierList.findAnnotation("some.package.MadeUpAnnotation")
+        }
+    }
+
     private fun Array<out PsiMember>.names() = mapTo(LinkedHashSet()) { it.name!! }
 }