Do not throw on using kotlin resolve via light classes in dumb mode

Fix an exception when kotlin resolve was invoked when searching
    for tests while indexing (probably many other cases)
Does not actually fix the behaviour, the test will not be found
    resulting in undesired behaviour
Full-blown infrastructure for resolving Kotlin in dumb mode is needed
    to fix the behaviour

 #KT-24979 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/lightClasses/IdeLightClassInheritanceHelper.kt

@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.asJava.ImpreciseResolveResult.*
 import org.jetbrains.kotlin.asJava.classes.KtLightClass
 import org.jetbrains.kotlin.asJava.classes.LightClassInheritanceHelper
 import org.jetbrains.kotlin.asJava.classes.defaultJavaAncestorQualifiedName
+import org.jetbrains.kotlin.idea.caches.resolve.util.isInDumbMode
 import org.jetbrains.kotlin.idea.search.PsiBasedClassResolver
 import org.jetbrains.kotlin.psi.KtSimpleNameExpression
 import org.jetbrains.kotlin.psi.KtSuperTypeCallEntry
@@ -34,6 +35,8 @@ class IdeLightClassInheritanceHelper : LightClassInheritanceHelper {
         baseClass: PsiClass,
         checkDeep: Boolean
     ): ImpreciseResolveResult {
+        if (baseClass.project.isInDumbMode()) return NO_MATCH
+
         val classOrObject = lightClass.kotlinOrigin ?: return UNSURE
         val entries = classOrObject.superTypeListEntries
         val hasSuperClass = entries.any { it is KtSuperTypeCallEntry }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/KtFileClassProviderImpl.kt

@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.asJava.classes.KtLightClassForFacade
 import org.jetbrains.kotlin.asJava.toLightClass
 import org.jetbrains.kotlin.fileClasses.JvmFileClassUtil
 import org.jetbrains.kotlin.fileClasses.javaFileFacadeFqName
-import org.jetbrains.kotlin.idea.caches.project.getModuleInfo
+import org.jetbrains.kotlin.idea.caches.resolve.util.isInDumbMode
 import org.jetbrains.kotlin.psi.KtClassOrObject
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi.KtFileClassProvider
@@ -21,6 +21,10 @@ import org.jetbrains.kotlin.psi.analysisContext
 class KtFileClassProviderImpl(val kotlinAsJavaSupport: KotlinAsJavaSupport) :
     KtFileClassProvider {
     override fun getFileClasses(file: KtFile): Array<PsiClass> {
+        if (file.project.isInDumbMode()) {
+            return PsiClass.EMPTY_ARRAY
+        }
+
         // TODO We don't currently support finding light classes for scripts
         if (file.isCompiled || file.isScript()) {
             return PsiClass.EMPTY_ARRAY

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/util/dumbUtils.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.caches.resolve.util
+
+import com.intellij.openapi.diagnostic.Logger
+import com.intellij.openapi.project.DumbService
+import com.intellij.openapi.project.Project
+
+
+private val LOG = Logger.getInstance("kotlin.resolve.dumb.mode")
+
+fun Project.isInDumbMode(): Boolean {
+    val dumbService = DumbService.getInstance(this)
+    val dumb = dumbService.isDumb
+    if (dumb && dumbService.isAlternativeResolveEnabled) {
+        LOG.warn("Kotlin does not support alternative resolve", Throwable("<stacktrace>"))
+    }
+    return dumb
+}
+