More diagnostics for EA-85926 and EA-77163

compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/FileScopeFactory.kt

@@ -86,7 +86,11 @@ class FileScopeFactory(
 
         val packageView = moduleDescriptor.getPackage(file.packageFqName)
         val packageFragment = topLevelDescriptorProvider.getPackageFragment(file.packageFqName)
-                              ?: error("Could not find fragment ${file.packageFqName} for file ${file.name}")
+        if (packageFragment == null) {
+            // TODO J2K and change return type of diagnoseMissingPackageFragment() to Nothing
+            (topLevelDescriptorProvider as? LazyClassContext)?.declarationProviderFactory?.diagnoseMissingPackageFragment(file)
+            error("Could not find fragment ${file.packageFqName} for file ${file.name}")
+        }
 
         fun createImportResolver(indexedImports: IndexedImports, trace: BindingTrace, excludedImports: List<FqName>? = null) =
                 LazyImportResolver(

idea/idea-analysis/src/org/jetbrains/kotlin/idea/stubindex/SubpackagesIndexService.kt

@@ -18,6 +18,7 @@ package org.jetbrains.kotlin.idea.stubindex
 
 import com.intellij.openapi.components.ServiceManager
 import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiManager
 import com.intellij.psi.search.GlobalSearchScope
 import com.intellij.psi.util.CachedValueProvider
 import com.intellij.psi.util.CachedValuesManager
@@ -42,6 +43,7 @@ class SubpackagesIndexService(private val project: Project) {
         // a map from any existing package (in kotlin) to a set of subpackages (not necessarily direct) containing files
         private val allPackageFqNames = hashSetOf<FqName>()
         private val fqNameByPrefix = MultiMap.createSet<FqName, FqName>()
+        private val oocbCount = PsiManager.getInstance(project).modificationTracker.outOfCodeBlockModificationCount
 
         init {
             for (fqNameAsString in allPackageFqNames) {
@@ -80,6 +82,8 @@ class SubpackagesIndexService(private val project: Project) {
 
             return existingSubPackagesShortNames.map { fqName.child(it) }
         }
+
+        override fun toString() = "SubpackagesIndex: OOCB on creation $oocbCount, all packages size ${allPackageFqNames.size}"
     }
 
     companion object {

idea/idea-analysis/src/org/jetbrains/kotlin/idea/stubindex/resolve/PluginDeclarationProviderFactory.kt

@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.idea.stubindex.resolve
 import com.intellij.openapi.project.Project
 import com.intellij.psi.search.GlobalSearchScope
 import org.jetbrains.kotlin.idea.stubindex.PackageIndexUtil
+import org.jetbrains.kotlin.idea.stubindex.SubpackagesIndexService
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.resolve.lazy.data.KtClassLikeInfo
@@ -56,9 +57,12 @@ class PluginDeclarationProviderFactory(
 
     override fun diagnoseMissingPackageFragment(file: KtFile) {
         val packageFqName = file.packageFqName
+        val subpackagesIndex = SubpackagesIndexService.getInstance(project)
         throw IllegalStateException("Cannot find package fragment for file ${file.name} with package $packageFqName, " +
                                     "vFile ${file.virtualFile}, nonIndexed ${file in nonIndexedFiles} " +
-                                    "packageExists=${PackageIndexUtil.packageExists(packageFqName, indexedFilesScope, project)}")
+                                    "packageExists=${PackageIndexUtil.packageExists(packageFqName, indexedFilesScope, project)} in $indexedFilesScope," +
+                                    "SPI.packageExists=${subpackagesIndex.packageExists(packageFqName)} SPI=$subpackagesIndex " +
+                                    "OOCB count ${file.manager.modificationTracker.outOfCodeBlockModificationCount}}")
     }
 
     // trying to diagnose org.jetbrains.kotlin.resolve.lazy.NoDescriptorForDeclarationException in completion