Decompile builtins (kotlin_class and kotlin_package files)

The main purpose of this is to be able to index builtin declarations and enable go to symbol/class functionality in ide
Also it makes sense to show builtin classes (Any, Int ...) as classes when browsing kotlin-runtime.jar

Refactor decompiler code to eliminate existing and potential duplication
Share the code between js (kjsm) decompilation and builtin decompilation heavily

core/descriptors/src/org/jetbrains/kotlin/builtins/BuiltInsSerializedResourcePaths.kt

@@ -30,9 +30,9 @@ public object BuiltInsSerializedResourcePaths : SerializedResourcePaths() {
         BuiltInsProtoBuf.registerAllExtensions(extensionRegistry)
     }
 
-    private val CLASS_METADATA_FILE_EXTENSION = "kotlin_class"
-    private val PACKAGE_FILE_EXTENSION = "kotlin_package"
-    private val STRING_TABLE_FILE_EXTENSION = "kotlin_string_table"
+    val CLASS_METADATA_FILE_EXTENSION = "kotlin_class"
+    val PACKAGE_FILE_EXTENSION = "kotlin_package"
+    val STRING_TABLE_FILE_EXTENSION = "kotlin_string_table"
 
     public override fun getClassMetadataPath(classId: ClassId): String {
         return packageFqNameToPath(classId.getPackageFqName()) + "/" + classId.getRelativeClassName().asString() +

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/builtIns/KotlinBuiltInDecompiler.kt

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.decompiler.builtIns
+
+import com.intellij.ide.highlighter.JavaClassFileType
+import com.intellij.openapi.diagnostic.Logger
+import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.psi.FileViewProvider
+import com.intellij.psi.PsiManager
+import com.intellij.psi.compiled.ClassFileDecompilers
+import org.jetbrains.kotlin.builtins.BuiltInsSerializedResourcePaths
+import org.jetbrains.kotlin.idea.decompiler.KotlinDecompiledFileViewProvider
+import org.jetbrains.kotlin.idea.decompiler.KtDecompiledFile
+import org.jetbrains.kotlin.idea.decompiler.common.toClassProto
+import org.jetbrains.kotlin.idea.decompiler.common.toPackageProto
+import org.jetbrains.kotlin.idea.decompiler.textBuilder.DecompiledText
+import org.jetbrains.kotlin.idea.decompiler.textBuilder.buildDecompiledText
+import org.jetbrains.kotlin.idea.decompiler.textBuilder.defaultDecompilerRendererOptions
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.renderer.DescriptorRenderer
+import org.jetbrains.kotlin.serialization.ProtoBuf
+import org.jetbrains.kotlin.serialization.builtins.BuiltInsProtoBuf
+import org.jetbrains.kotlin.serialization.deserialization.NameResolverImpl
+
+class KotlinBuiltInDecompiler : ClassFileDecompilers.Full() {
+    private val stubBuilder = KotlinBuiltInStubBuilder()
+
+    override fun accepts(file: VirtualFile): Boolean {
+        return file.fileType == KotlinBuiltInClassFileType || file.fileType == KotlinBuiltInPackageFileType
+    }
+
+    override fun getStubBuilder() = stubBuilder
+
+    override fun createFileViewProvider(file: VirtualFile, manager: PsiManager, physical: Boolean): FileViewProvider {
+        return KotlinDecompiledFileViewProvider(manager, file, physical) { provider ->
+            if (isInternalBuiltInFile(provider.virtualFile)) {
+                null
+            }
+            else {
+                KtDecompiledFile(provider) { file ->
+                    buildDecompiledTextForBuiltIns(file)
+                }
+            }
+        }
+    }
+
+    companion object {
+        val LOG = Logger.getInstance(KotlinBuiltInDecompiler::class.java)
+    }
+}
+
+private val decompilerRendererForBuiltIns = DescriptorRenderer.withOptions { defaultDecompilerRendererOptions() }
+
+public fun buildDecompiledTextForBuiltIns(
+        builtInFile: VirtualFile
+): DecompiledText {
+    val directory = builtInFile.parent!!
+    val nameResolver = readStringTable(directory, KotlinBuiltInDecompiler.LOG)!!
+    val content = builtInFile.contentsToByteArray()
+    return when (builtInFile.fileType) {
+        KotlinBuiltInPackageFileType -> {
+            val packageFqName = content.toPackageProto(BuiltInsSerializedResourcePaths.extensionRegistry).packageFqName(nameResolver)
+            val resolver = KotlinBuiltInDeserializerForDecompiler(directory, packageFqName, nameResolver)
+            buildDecompiledText(packageFqName, resolver.resolveDeclarationsInFacade(packageFqName), decompilerRendererForBuiltIns)
+        }
+        KotlinBuiltInClassFileType -> {
+            val classProto = content.toClassProto(BuiltInsSerializedResourcePaths.extensionRegistry)
+            val classId = nameResolver.getClassId(classProto.fqName)
+            val packageFqName = classId.packageFqName
+            val resolver = KotlinBuiltInDeserializerForDecompiler(directory, packageFqName, nameResolver)
+            buildDecompiledText(
+                    packageFqName,
+                    listOfNotNull(resolver.resolveTopLevelClass(classId)),
+                    decompilerRendererForBuiltIns
+            )
+        }
+        else -> error("Unexpected filetype ${builtInFile.fileType}")
+    }
+}
+
+fun ProtoBuf.Package.packageFqName(nameResolver: NameResolverImpl): FqName {
+    return nameResolver.getPackageFqName(getExtension(BuiltInsProtoBuf.packageFqName))
+}
+
+fun isInternalBuiltInFile(virtualFile: VirtualFile): Boolean {
+    when (virtualFile.fileType) {
+        KotlinBuiltInPackageFileType -> {
+            // do not accept kotlin_package files without packageFqName extension to avoid failing on older runtimes
+            // this check may be costly but there are few kotlin_package files
+            val packageProto = virtualFile.contentsToByteArray().toPackageProto(BuiltInsSerializedResourcePaths.extensionRegistry)
+            return !packageProto.hasExtension(BuiltInsProtoBuf.packageFqName)
+        }
+        KotlinBuiltInClassFileType -> {
+            val correspondsToInnerClass = virtualFile.nameWithoutExtension.contains('.')
+            if (correspondsToInnerClass) {
+                return true
+            }
+            val classFileName = virtualFile.nameWithoutExtension + "." + JavaClassFileType.INSTANCE.defaultExtension
+            val classFileForTheSameClassIsPresent = virtualFile.parent!!.findChild(classFileName) != null
+            return classFileForTheSameClassIsPresent
+        }
+        else -> error("Unexpected filetype ${virtualFile.fileType}")
+    }
+}

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/builtIns/KotlinBuiltInDeserializerForDecompiler.kt

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.decompiler.builtIns
+
+import com.intellij.openapi.diagnostic.Logger
+import com.intellij.openapi.vfs.VirtualFile
+import org.jetbrains.kotlin.builtins.BuiltInSerializerProtocol
+import org.jetbrains.kotlin.builtins.BuiltInsSerializedResourcePaths
+import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.idea.decompiler.common.DirectoryBasedClassDataFinder
+import org.jetbrains.kotlin.idea.decompiler.textBuilder.DeserializerForDecompilerBase
+import org.jetbrains.kotlin.idea.decompiler.textBuilder.LoggingErrorReporter
+import org.jetbrains.kotlin.idea.decompiler.textBuilder.ResolveEverythingToKotlinAnyLocalClassResolver
+import org.jetbrains.kotlin.incremental.components.LookupTracker
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.resolve.TargetPlatform
+import org.jetbrains.kotlin.serialization.deserialization.*
+
+public class KotlinBuiltInDeserializerForDecompiler(
+        packageDirectory: VirtualFile,
+        packageFqName: FqName,
+        private val nameResolver: NameResolver
+) : DeserializerForDecompilerBase(packageDirectory, packageFqName) {
+    override val targetPlatform: TargetPlatform get() = TargetPlatform.Default
+
+    private val classDataFinder = DirectoryBasedClassDataFinder(
+            packageDirectory, directoryPackageFqName, nameResolver, BuiltInsSerializedResourcePaths
+    )
+
+    override val deserializationComponents = DeserializationComponents(
+            storageManager, moduleDescriptor, classDataFinder, AnnotationAndConstantLoaderImpl(moduleDescriptor, BuiltInSerializerProtocol),
+            packageFragmentProvider, ResolveEverythingToKotlinAnyLocalClassResolver(targetPlatform.builtIns), LoggingErrorReporter(LOG),
+            LookupTracker.DO_NOTHING, FlexibleTypeCapabilitiesDeserializer.ThrowException, ClassDescriptorFactory.EMPTY
+    )
+
+    override fun resolveDeclarationsInFacade(facadeFqName: FqName): List<DeclarationDescriptor> {
+        return getDescriptorsFromPackageFile(facadeFqName, BuiltInsSerializedResourcePaths, LOG, nameResolver)
+    }
+
+    companion object {
+        private val LOG = Logger.getInstance(KotlinBuiltInDeserializerForDecompiler::class.java)
+    }
+}

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/builtIns/KotlinBuiltInStubBuilder.kt

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.decompiler.builtIns
+
+import com.intellij.openapi.diagnostic.Logger
+import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.psi.compiled.ClsStubBuilder
+import com.intellij.psi.impl.compiled.ClassFileStubBuilder
+import com.intellij.psi.stubs.PsiFileStub
+import com.intellij.util.indexing.FileContent
+import org.jetbrains.annotations.TestOnly
+import org.jetbrains.kotlin.builtins.BuiltInSerializerProtocol
+import org.jetbrains.kotlin.builtins.BuiltInsSerializedResourcePaths
+import org.jetbrains.kotlin.idea.decompiler.common.AnnotationLoaderForStubBuilderImpl
+import org.jetbrains.kotlin.idea.decompiler.common.DirectoryBasedClassDataFinder
+import org.jetbrains.kotlin.idea.decompiler.common.toClassProto
+import org.jetbrains.kotlin.idea.decompiler.common.toPackageProto
+import org.jetbrains.kotlin.idea.decompiler.stubBuilder.ClsStubBuilderComponents
+import org.jetbrains.kotlin.idea.decompiler.stubBuilder.createPackageFacadeStub
+import org.jetbrains.kotlin.idea.decompiler.stubBuilder.createTopLevelClassStub
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.psi.stubs.impl.KotlinFileStubImpl
+import org.jetbrains.kotlin.serialization.deserialization.NameResolver
+import org.jetbrains.kotlin.serialization.deserialization.NameResolverImpl
+import org.jetbrains.kotlin.serialization.deserialization.TypeTable
+import java.io.ByteArrayInputStream
+
+public class KotlinBuiltInStubBuilder : ClsStubBuilder() {
+    override fun getStubVersion() = ClassFileStubBuilder.STUB_VERSION + 1
+
+    override fun buildFileStub(content: FileContent): PsiFileStub<*>? {
+
+        if (isInternalBuiltInFile(content.file)) return null
+
+        return doBuildFileStub(content)
+    }
+
+    @TestOnly
+    fun doBuildFileStub(content: FileContent): KotlinFileStubImpl? {
+        val file = content.file
+        val directory = file.parent!!
+        val nameResolver = readStringTable(directory, LOG) ?: return null
+        val contentAsBytes = content.content
+
+        return when (file.fileType) {
+            KotlinBuiltInPackageFileType -> {
+                val packageProto = contentAsBytes.toPackageProto(BuiltInsSerializedResourcePaths.extensionRegistry)
+                val packageFqName = packageProto.packageFqName(nameResolver)
+                val components = createStubBuilderComponents(file, packageFqName, nameResolver)
+                val context = components.createContext(
+                        nameResolver, packageFqName, TypeTable(packageProto.typeTable)
+                )
+                createPackageFacadeStub(packageProto, packageFqName, context)
+            }
+            KotlinBuiltInClassFileType -> {
+                val classProto = contentAsBytes.toClassProto(BuiltInsSerializedResourcePaths.extensionRegistry)
+                val classId = nameResolver.getClassId(classProto.fqName)
+                val packageFqName = classId.packageFqName
+                val components = createStubBuilderComponents(file, packageFqName, nameResolver)
+                val context = components.createContext(nameResolver, packageFqName, TypeTable(classProto.typeTable))
+                createTopLevelClassStub(classId, classProto, context)
+            }
+            else -> error("Unexpected filetype ${file.fileType}")
+        }
+    }
+
+    private fun createStubBuilderComponents(file: VirtualFile, packageFqName: FqName, nameResolver: NameResolver): ClsStubBuilderComponents {
+        val finder = DirectoryBasedClassDataFinder(file.parent!!, packageFqName, nameResolver, BuiltInsSerializedResourcePaths)
+        val annotationLoader = AnnotationLoaderForStubBuilderImpl(BuiltInSerializerProtocol)
+        return ClsStubBuilderComponents(finder, annotationLoader)
+    }
+
+    companion object {
+        val LOG = Logger.getInstance(KotlinBuiltInStubBuilder::class.java)
+    }
+}
+
+fun readStringTable(directory: VirtualFile, log: Logger): NameResolverImpl? {
+    val stringsFileName = "${directory.name}.${BuiltInsSerializedResourcePaths.STRING_TABLE_FILE_EXTENSION}"
+    val stringTableFile = directory.findFileByRelativePath(stringsFileName) ?: return run {
+        log.error("$stringsFileName not found in $directory")
+        null
+    }
+    val nameResolver = try {
+        NameResolverImpl.read(ByteArrayInputStream(stringTableFile.contentsToByteArray(false)))
+    }
+    catch (e: Exception) {
+        log.error("Error reading data from $stringTableFile ", e)
+        null
+    }
+    return nameResolver
+}

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/builtIns/fileTypes.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.decompiler.builtIns
+
+import com.intellij.openapi.fileTypes.FileType
+import com.intellij.openapi.vfs.VirtualFile
+import org.jetbrains.kotlin.builtins.BuiltInsSerializedResourcePaths
+import org.jetbrains.kotlin.idea.KotlinIcons
+
+public object KotlinBuiltInClassFileType : FileType {
+    override fun getName() = "kotlin_class"
+
+    override fun getDescription() = "Kotlin builtin class"
+
+    override fun getDefaultExtension() = BuiltInsSerializedResourcePaths.CLASS_METADATA_FILE_EXTENSION
+
+    override fun getIcon() = KotlinIcons.CLASS
+
+    override fun isBinary() = true
+
+    override fun isReadOnly() = true
+
+    override fun getCharset(file: VirtualFile, content: ByteArray) = null
+}
+
+public object KotlinBuiltInPackageFileType : FileType {
+    override fun getName() = "kotlin_package"
+
+    override fun getDescription() = "Kotlin builtin package"
+
+    override fun getDefaultExtension() = BuiltInsSerializedResourcePaths.PACKAGE_FILE_EXTENSION
+
+    override fun getIcon() = KotlinIcons.FILE
+
+    override fun isBinary() = true
+
+    override fun isReadOnly() = true
+
+    override fun getCharset(file: VirtualFile, content: ByteArray) = null
+}

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/classFile/DeserializerForClassfileDecompiler.kt

@@ -64,7 +64,7 @@ public class DeserializerForClassfileDecompiler(
             LookupTracker.DO_NOTHING, JavaFlexibleTypeCapabilitiesDeserializer, ClassDescriptorFactory.EMPTY
     )
 
-    override fun resolveDeclarationsInFacade(facadeFqName: FqName): Collection<DeclarationDescriptor> {
+    override fun resolveDeclarationsInFacade(facadeFqName: FqName): List<DeclarationDescriptor> {
         val packageFqName = facadeFqName.parent()
         assert(packageFqName == directoryPackageFqName) {
             "Was called for $facadeFqName; only members of $directoryPackageFqName package are expected."
@@ -81,7 +81,7 @@ public class DeserializerForClassfileDecompiler(
         val membersScope = DeserializedPackageMemberScope(
                 createDummyPackageFragment(packageFqName), packageProto, nameResolver, deserializationComponents
         ) { emptyList() }
-        return membersScope.getContributedDescriptors()
+        return membersScope.getContributedDescriptors().toList()
     }
 
     companion object {

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/classFile/KotlinClassFileDecompiler.kt

@@ -26,14 +26,13 @@ import org.jetbrains.kotlin.idea.decompiler.KtDecompiledFile
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.DecompiledText
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.ResolverForDecompiler
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.buildDecompiledText
+import org.jetbrains.kotlin.idea.decompiler.textBuilder.defaultDecompilerRendererOptions
 import org.jetbrains.kotlin.load.java.JvmAbi
 import org.jetbrains.kotlin.load.kotlin.KotlinBinaryClassCache
 import org.jetbrains.kotlin.load.kotlin.header.isCompatibleClassKind
 import org.jetbrains.kotlin.load.kotlin.header.isCompatibleFileFacadeKind
 import org.jetbrains.kotlin.load.kotlin.header.isCompatibleMultifileClassKind
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
-import org.jetbrains.kotlin.renderer.DescriptorRendererModifier
-import org.jetbrains.kotlin.renderer.ExcludedTypeAnnotations
 import org.jetbrains.kotlin.types.flexibility
 import org.jetbrains.kotlin.types.isFlexible
 import java.util.*
@@ -50,14 +49,10 @@ public class KotlinClassFileDecompiler : ClassFileDecompilers.Full() {
         return KotlinDecompiledFileViewProvider(manager, file, physical) { provider ->
             val virtualFile = provider.virtualFile
             val fileIndex = ServiceManager.getService(project, FileIndexFacade::class.java)
-            if (!fileIndex.isInLibraryClasses(virtualFile) && fileIndex.isInSource(virtualFile)) {
-                null
-            }
-            else if (isKotlinInternalCompiledFile(virtualFile)) {
-                null
-            }
-            else {
-                KtClsFile(provider)
+            when {
+                !fileIndex.isInLibraryClasses(virtualFile) && fileIndex.isInSource(virtualFile) -> null
+                isKotlinInternalCompiledFile(virtualFile) -> null
+                else -> KtClsFile(provider)
             }
         }
     }
@@ -65,13 +60,9 @@ public class KotlinClassFileDecompiler : ClassFileDecompilers.Full() {
 
 class KtClsFile(provider: KotlinDecompiledFileViewProvider) : KtDecompiledFile(provider, { file -> buildDecompiledTextForClassFile(file) })
 
-private val descriptorRendererForClassFileDecompiler = DescriptorRenderer.withOptions {
-    withDefinedIn = false
-    classWithPrimaryConstructor = true
+private val decompilerRendererForClassFiles = DescriptorRenderer.withOptions {
+    defaultDecompilerRendererOptions()
     typeNormalizer = { type -> if (type.isFlexible()) type.flexibility().lowerBound else type }
-    secondaryConstructorsAsPrimary = false
-    modifiers = DescriptorRendererModifier.ALL
-    excludedTypeAnnotationClasses = ExcludedTypeAnnotations.annotationsForNullabilityAndMutability
 }
 
 private val FILE_ABI_VERSION_MARKER: String = "FILE_ABI"
@@ -103,13 +94,13 @@ public fun buildDecompiledTextForClassFile(
                     mapOf())
         }
         classHeader.isCompatibleFileFacadeKind() ->
-            buildDecompiledText(packageFqName, ArrayList(resolver.resolveDeclarationsInFacade(classId.asSingleFqName())), descriptorRendererForClassFileDecompiler)
+            buildDecompiledText(packageFqName, ArrayList(resolver.resolveDeclarationsInFacade(classId.asSingleFqName())), decompilerRendererForClassFiles)
         classHeader.isCompatibleClassKind() ->
-            buildDecompiledText(packageFqName, listOfNotNull(resolver.resolveTopLevelClass(classId)), descriptorRendererForClassFileDecompiler)
+            buildDecompiledText(packageFqName, listOfNotNull(resolver.resolveTopLevelClass(classId)), decompilerRendererForClassFiles)
         classHeader.isCompatibleMultifileClassKind() -> {
             val partClasses = findMultifileClassParts(classFile, kotlinClass)
             val partMembers = partClasses.flatMap { partClass -> resolver.resolveDeclarationsInFacade(partClass.classId.asSingleFqName()) }
-            buildDecompiledText(packageFqName, partMembers, descriptorRendererForClassFileDecompiler)
+            buildDecompiledText(packageFqName, partMembers, decompilerRendererForClassFiles)
         }
         else ->
             throw UnsupportedOperationException("Unknown header kind: ${classHeader.kind} ${classHeader.isCompatibleAbiVersion}")

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/common/AnnotationLoaderForStubBuilderImpl.kt

@@ -14,25 +14,27 @@
  * limitations under the License.
  */
 
-package org.jetbrains.kotlin.idea.decompiler.js
+package org.jetbrains.kotlin.idea.decompiler.common
 
 import com.google.protobuf.MessageLite
 import org.jetbrains.kotlin.idea.decompiler.stubBuilder.ClassIdWithTarget
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.serialization.ProtoBuf
+import org.jetbrains.kotlin.serialization.SerializerExtensionProtocol
 import org.jetbrains.kotlin.serialization.deserialization.AnnotatedCallableKind
 import org.jetbrains.kotlin.serialization.deserialization.AnnotationAndConstantLoader
 import org.jetbrains.kotlin.serialization.deserialization.NameResolver
 import org.jetbrains.kotlin.serialization.deserialization.ProtoContainer
-import org.jetbrains.kotlin.serialization.js.JsProtoBuf
 import org.jetbrains.kotlin.types.KotlinType
 
-public class AnnotationLoaderForKotlinJavaScriptStubBuilder() : AnnotationAndConstantLoader<ClassId, Unit, ClassIdWithTarget> {
+public class AnnotationLoaderForStubBuilderImpl(
+        private val protocol: SerializerExtensionProtocol
+) : AnnotationAndConstantLoader<ClassId, Unit, ClassIdWithTarget> {
 
     override fun loadClassAnnotations(
             classProto: ProtoBuf.Class, nameResolver: NameResolver
     ): List<ClassId> =
-         classProto.getExtension(JsProtoBuf.classAnnotation).orEmpty().map { nameResolver.getClassId(it.id) }
+         classProto.getExtension(protocol.classAnnotation).orEmpty().map { nameResolver.getClassId(it.id) }
 
     override fun loadCallableAnnotations(
             container: ProtoContainer,
@@ -40,9 +42,9 @@ public class AnnotationLoaderForKotlinJavaScriptStubBuilder() : AnnotationAndCon
             kind: AnnotatedCallableKind
     ): List<ClassIdWithTarget> {
         val annotations = when (proto) {
-            is ProtoBuf.Constructor -> proto.getExtension(JsProtoBuf.constructorAnnotation)
-            is ProtoBuf.Function -> proto.getExtension(JsProtoBuf.functionAnnotation)
-            is ProtoBuf.Property -> proto.getExtension(JsProtoBuf.propertyAnnotation)
+            is ProtoBuf.Constructor -> proto.getExtension(protocol.constructorAnnotation)
+            is ProtoBuf.Function -> proto.getExtension(protocol.functionAnnotation)
+            is ProtoBuf.Property -> proto.getExtension(protocol.propertyAnnotation)
             else -> error("Unknown message: $proto")
         }.orEmpty()
         return annotations.map {
@@ -57,7 +59,7 @@ public class AnnotationLoaderForKotlinJavaScriptStubBuilder() : AnnotationAndCon
             parameterIndex: Int,
             proto: ProtoBuf.ValueParameter
     ): List<ClassId> =
-            proto.getExtension(JsProtoBuf.parameterAnnotation).orEmpty().map {
+            proto.getExtension(protocol.parameterAnnotation).orEmpty().map {
                 container.nameResolver.getClassId(it.id)
             }
 
@@ -71,10 +73,10 @@ public class AnnotationLoaderForKotlinJavaScriptStubBuilder() : AnnotationAndCon
             proto: ProtoBuf.Type,
             nameResolver: NameResolver
     ): List<ClassId> =
-            proto.getExtension(JsProtoBuf.typeAnnotation).orEmpty().map { nameResolver.getClassId(it.id) }
+            proto.getExtension(protocol.typeAnnotation).orEmpty().map { nameResolver.getClassId(it.id) }
 
     override fun loadTypeParameterAnnotations(proto: ProtoBuf.TypeParameter, nameResolver: NameResolver): List<ClassId> =
-        proto.getExtension(JsProtoBuf.typeParameterAnnotation).orEmpty().map { nameResolver.getClassId(it.id) }
+        proto.getExtension(protocol.typeParameterAnnotation).orEmpty().map { nameResolver.getClassId(it.id) }
 
     override fun loadPropertyConstant(
             container: ProtoContainer,

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/common/ProtoBufUtil.kt

@@ -14,18 +14,16 @@
  * limitations under the License.
  */
 
-package org.jetbrains.kotlin.serialization.js
+package org.jetbrains.kotlin.idea.decompiler.common
 
+import com.google.protobuf.ExtensionRegistryLite
 import org.jetbrains.kotlin.serialization.ProtoBuf
 import java.io.ByteArrayInputStream
 
-public fun ByteArray.toPackageProto(): ProtoBuf.Package {
-    val registry = KotlinJavascriptSerializedResourcePaths.extensionRegistry
-    return ProtoBuf.Package.parseFrom(ByteArrayInputStream(this), registry)!!
-}
-
-public fun ByteArray.toClassProto(): ProtoBuf.Class {
-    val registry = KotlinJavascriptSerializedResourcePaths.extensionRegistry
-    return ProtoBuf.Class.parseFrom(ByteArrayInputStream(this), registry)
+fun ByteArray.toPackageProto(extensionRegistry: ExtensionRegistryLite): ProtoBuf.Package {
+    return ProtoBuf.Package.parseFrom(ByteArrayInputStream(this), extensionRegistry)!!
 }
 
+fun ByteArray.toClassProto(extensionRegistry: ExtensionRegistryLite): ProtoBuf.Class {
+    return ProtoBuf.Class.parseFrom(ByteArrayInputStream(this), extensionRegistry)
+}

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/common/directoryBasedFinders.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.decompiler.common
+
+import com.intellij.openapi.vfs.VirtualFile
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.serialization.ClassData
+import org.jetbrains.kotlin.serialization.ClassDataWithSource
+import org.jetbrains.kotlin.serialization.SerializedResourcePaths
+import org.jetbrains.kotlin.serialization.deserialization.ClassDataFinder
+import org.jetbrains.kotlin.serialization.deserialization.NameResolver
+
+class DirectoryBasedClassDataFinder(
+        private val packageDirectory: VirtualFile,
+        private val directoryPackageFqName: FqName,
+        private val nameResolver: NameResolver,
+        private val paths: SerializedResourcePaths
+) : ClassDataFinder {
+    fun findFileForClass(classId: ClassId): VirtualFile? {
+        if (classId.packageFqName != directoryPackageFqName) return null
+
+        val pathRelativeToDir = paths.getClassMetadataPath(classId).substringAfterLast("/")
+        return packageDirectory.findChild(pathRelativeToDir)
+    }
+
+    override fun findClassData(classId: ClassId): ClassDataWithSource? {
+        val virtualFile = findFileForClass(classId) ?: return null
+
+        val content = virtualFile.contentsToByteArray(false)
+        val classProto = content.toClassProto(paths.extensionRegistry)
+        return ClassDataWithSource(ClassData(nameResolver, classProto))
+    }
+}
+

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/js/KotlinJavaScriptDeserializerForDecompiler.kt

@@ -19,19 +19,17 @@ package org.jetbrains.kotlin.idea.decompiler.js
 import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.vfs.VirtualFile
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.idea.decompiler.common.DirectoryBasedClassDataFinder
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.DeserializerForDecompilerBase
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.LoggingErrorReporter
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.ResolveEverythingToKotlinAnyLocalClassResolver
 import org.jetbrains.kotlin.incremental.components.LookupTracker
 import org.jetbrains.kotlin.js.resolve.JsPlatform
-import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.resolve.TargetPlatform
-import org.jetbrains.kotlin.serialization.ClassData
-import org.jetbrains.kotlin.serialization.ClassDataWithSource
 import org.jetbrains.kotlin.serialization.deserialization.*
-import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedPackageMemberScope
-import org.jetbrains.kotlin.serialization.js.*
+import org.jetbrains.kotlin.serialization.js.JsSerializerProtocol
+import org.jetbrains.kotlin.serialization.js.KotlinJavascriptSerializedResourcePaths
 import java.io.ByteArrayInputStream
 
 public class KotlinJavaScriptDeserializerForDecompiler(
@@ -48,62 +46,22 @@ public class KotlinJavaScriptDeserializerForDecompiler(
 
     override val targetPlatform: TargetPlatform get() = JsPlatform
 
-    private val metaFileFinder = DirectoryBasedKotlinJavaScriptMetaFileFinder(packageDirectory, directoryPackageFqName, nameResolver)
-
-    private val classDataFinder = DirectoryBasedKotlinJavaScriptDataFinder(metaFileFinder, LOG)
+    private val finder = DirectoryBasedClassDataFinder(packageDirectory, directoryPackageFqName, nameResolver, KotlinJavascriptSerializedResourcePaths)
 
     private val annotationAndConstantLoader = AnnotationAndConstantLoaderImpl(moduleDescriptor, JsSerializerProtocol)
 
     override val deserializationComponents = DeserializationComponents(
-            storageManager, moduleDescriptor, classDataFinder, annotationAndConstantLoader, packageFragmentProvider,
+            storageManager, moduleDescriptor, finder, annotationAndConstantLoader, packageFragmentProvider,
             ResolveEverythingToKotlinAnyLocalClassResolver(targetPlatform.builtIns), LoggingErrorReporter(LOG),
             LookupTracker.DO_NOTHING, FlexibleTypeCapabilitiesDeserializer.Dynamic, ClassDescriptorFactory.EMPTY
     )
 
-    override fun resolveDeclarationsInFacade(facadeFqName: FqName): Collection<DeclarationDescriptor> {
+    override fun resolveDeclarationsInFacade(facadeFqName: FqName): List<DeclarationDescriptor> {
         val packageFqName = facadeFqName.parent()
-        assert(packageFqName == directoryPackageFqName) {
-            "Was called for $facadeFqName; only members of $directoryPackageFqName package are expected."
-        }
-        val file = metaFileFinder.findKotlinJavascriptMetaFile(ClassId.topLevel(facadeFqName))
-        if (file == null) {
-            LOG.error("Could not read data for $facadeFqName")
-            return emptyList()
-        }
-
-        val content = file.contentsToByteArray(false)
-        val membersScope = DeserializedPackageMemberScope(
-                createDummyPackageFragment(packageFqName), content.toPackageProto(), nameResolver, deserializationComponents
-        ) { emptyList() }
-        return membersScope.getContributedDescriptors()
+        return getDescriptorsFromPackageFile(packageFqName, KotlinJavascriptSerializedResourcePaths, LOG, nameResolver)
     }
 
     companion object {
         private val LOG = Logger.getInstance(KotlinJavaScriptDeserializerForDecompiler::class.java)
     }
 }
-
-class DirectoryBasedKotlinJavaScriptMetaFileFinder(
-        val packageDirectory: VirtualFile,
-        val directoryPackageFqName: FqName,
-        val nameResolver: NameResolver
-) {
-    fun findKotlinJavascriptMetaFile(classId: ClassId): VirtualFile? {
-        if (classId.getPackageFqName() != directoryPackageFqName) return null
-
-        val targetName = classId.getRelativeClassName().pathSegments().joinToString(".", postfix = "." + KotlinJavascriptSerializationUtil.CLASS_METADATA_FILE_EXTENSION)
-        return packageDirectory.findChild(targetName)
-    }
-}
-
-class DirectoryBasedKotlinJavaScriptDataFinder(
-        val classFinder: DirectoryBasedKotlinJavaScriptMetaFileFinder,
-        val log: Logger
-) : ClassDataFinder {
-    override fun findClassData(classId: ClassId): ClassDataWithSource? {
-        val file = classFinder.findKotlinJavascriptMetaFile(classId) ?: return null
-
-        val content = file.contentsToByteArray(false)
-        return ClassDataWithSource(ClassData(classFinder.nameResolver, content.toClassProto()))
-    }
-}

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/js/KotlinJavaScriptMetaFileDecompiler.kt

@@ -26,11 +26,10 @@ import org.jetbrains.kotlin.idea.decompiler.KtDecompiledFile
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.DecompiledText
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.ResolverForDecompiler
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.buildDecompiledText
+import org.jetbrains.kotlin.idea.decompiler.textBuilder.defaultDecompilerRendererOptions
 import org.jetbrains.kotlin.load.kotlin.OldPackageFacadeClassUtils
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
-import org.jetbrains.kotlin.renderer.DescriptorRendererModifier
-import org.jetbrains.kotlin.renderer.ExcludedTypeAnnotations
 import org.jetbrains.kotlin.serialization.js.KotlinJavascriptSerializationUtil
 import java.util.*
 
@@ -57,13 +56,7 @@ class KotlinJavaScriptMetaFileDecompiler : ClassFileDecompilers.Full() {
     }
 }
 
-private val descriptorRendererForKotlinJavascriptDecompiler = DescriptorRenderer.withOptions {
-    withDefinedIn = false
-    classWithPrimaryConstructor = true
-    secondaryConstructorsAsPrimary = false
-    modifiers = DescriptorRendererModifier.ALL
-    excludedTypeAnnotationClasses = ExcludedTypeAnnotations.annotationsForNullabilityAndMutability
-}
+private val decompilerRendererForJS = DescriptorRenderer.withOptions { defaultDecompilerRendererOptions() }
 
 public fun buildDecompiledTextFromJsMetadata(
         classFile: VirtualFile,
@@ -75,11 +68,11 @@ public fun buildDecompiledTextFromJsMetadata(
     if (isPackageHeader) {
         return buildDecompiledText(packageFqName,
                                    resolveDeclarationsInPackage(packageFqName, resolver),
-                                   descriptorRendererForKotlinJavascriptDecompiler)
+                                   decompilerRendererForJS)
     }
     else {
         val classId = JsMetaFileUtils.getClassId(classFile)
-        return buildDecompiledText(packageFqName, listOfNotNull(resolver.resolveTopLevelClass(classId)), descriptorRendererForKotlinJavascriptDecompiler)
+        return buildDecompiledText(packageFqName, listOfNotNull(resolver.resolveTopLevelClass(classId)), decompilerRendererForJS)
     }
 }
 

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/js/KotlinJavaScriptStubBuilder.kt

@@ -16,12 +16,15 @@
 
 package org.jetbrains.kotlin.idea.decompiler.js
 
-import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.psi.compiled.ClsStubBuilder
 import com.intellij.psi.impl.compiled.ClassFileStubBuilder
 import com.intellij.psi.stubs.PsiFileStub
 import com.intellij.util.indexing.FileContent
+import org.jetbrains.kotlin.idea.decompiler.common.AnnotationLoaderForStubBuilderImpl
+import org.jetbrains.kotlin.idea.decompiler.common.DirectoryBasedClassDataFinder
+import org.jetbrains.kotlin.idea.decompiler.common.toClassProto
+import org.jetbrains.kotlin.idea.decompiler.common.toPackageProto
 import org.jetbrains.kotlin.idea.decompiler.stubBuilder.ClsStubBuilderComponents
 import org.jetbrains.kotlin.idea.decompiler.stubBuilder.createPackageFacadeStub
 import org.jetbrains.kotlin.idea.decompiler.stubBuilder.createTopLevelClassStub
@@ -30,9 +33,8 @@ import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.serialization.deserialization.NameResolver
 import org.jetbrains.kotlin.serialization.deserialization.NameResolverImpl
 import org.jetbrains.kotlin.serialization.deserialization.TypeTable
+import org.jetbrains.kotlin.serialization.js.JsSerializerProtocol
 import org.jetbrains.kotlin.serialization.js.KotlinJavascriptSerializedResourcePaths
-import org.jetbrains.kotlin.serialization.js.toClassProto
-import org.jetbrains.kotlin.serialization.js.toPackageProto
 import java.io.ByteArrayInputStream
 
 public class KotlinJavaScriptStubBuilder : ClsStubBuilder() {
@@ -61,14 +63,14 @@ public class KotlinJavaScriptStubBuilder : ClsStubBuilder() {
         val components = createStubBuilderComponents(file, packageFqName, nameResolver)
 
         if (isPackageHeader) {
-            val packageProto = content.toPackageProto()
+            val packageProto = content.toPackageProto(KotlinJavascriptSerializedResourcePaths.extensionRegistry)
             val context = components.createContext(
                     nameResolver, packageFqName, TypeTable(packageProto.typeTable)
             )
             return createPackageFacadeStub(packageProto, packageFqName, context)
         }
         else {
-            val classProto = content.toClassProto()
+            val classProto = content.toClassProto(KotlinJavascriptSerializedResourcePaths.extensionRegistry)
             val context = components.createContext(nameResolver, packageFqName, TypeTable(classProto.typeTable))
             val classId = JsMetaFileUtils.getClassId(file)
             return createTopLevelClassStub(classId, classProto, context)
@@ -76,13 +78,10 @@ public class KotlinJavaScriptStubBuilder : ClsStubBuilder() {
     }
 
     private fun createStubBuilderComponents(file: VirtualFile, packageFqName: FqName, nameResolver: NameResolver): ClsStubBuilderComponents {
-        val metaFileFinder = DirectoryBasedKotlinJavaScriptMetaFileFinder(file.parent!!, packageFqName, nameResolver)
-        val classDataFinder = DirectoryBasedKotlinJavaScriptDataFinder(metaFileFinder, LOG)
-        val annotationLoader = AnnotationLoaderForKotlinJavaScriptStubBuilder()
+        val classDataFinder = DirectoryBasedClassDataFinder(
+                file.parent!!, packageFqName, nameResolver, KotlinJavascriptSerializedResourcePaths
+        )
+        val annotationLoader = AnnotationLoaderForStubBuilderImpl(JsSerializerProtocol)
         return ClsStubBuilderComponents(classDataFinder, annotationLoader)
     }
-
-    companion object {
-        val LOG = Logger.getInstance(KotlinJavaScriptStubBuilder::class.java)
-    }
 }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/textBuilder/DecompiledTextFactory.kt

@@ -21,6 +21,8 @@ import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.renderer.DescriptorRendererModifier
+import org.jetbrains.kotlin.renderer.DescriptorRendererOptions
+import org.jetbrains.kotlin.renderer.ExcludedTypeAnnotations
 import org.jetbrains.kotlin.resolve.DescriptorUtils.isEnumEntry
 import org.jetbrains.kotlin.resolve.dataClassUtils.isComponentLike
 import org.jetbrains.kotlin.resolve.descriptorUtil.secondaryConstructors
@@ -42,6 +44,14 @@ public fun descriptorToKey(descriptor: DeclarationDescriptor): String {
 
 public data class DecompiledText(public val text: String, public val renderedDescriptorsToRange: Map<String, TextRange>)
 
+fun DescriptorRendererOptions.defaultDecompilerRendererOptions() {
+    withDefinedIn = false
+    classWithPrimaryConstructor = true
+    secondaryConstructorsAsPrimary = false
+    modifiers = DescriptorRendererModifier.ALL
+    excludedTypeAnnotationClasses = ExcludedTypeAnnotations.annotationsForNullabilityAndMutability
+}
+
 public fun buildDecompiledText(
         packageFqName: FqName,
         descriptors: List<DeclarationDescriptor>,

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/textBuilder/DeserializerForDecompilerBase.kt

@@ -16,25 +16,22 @@
 
 package org.jetbrains.kotlin.idea.decompiler.textBuilder
 
+import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.vfs.VirtualFile
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.descriptors.ModuleParameters
-import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
-import org.jetbrains.kotlin.descriptors.PackageFragmentProvider
-import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
-import org.jetbrains.kotlin.descriptors.annotations.AnnotationWithTarget
+import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
 import org.jetbrains.kotlin.descriptors.impl.MutablePackageFragmentDescriptor
+import org.jetbrains.kotlin.idea.decompiler.common.toPackageProto
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.TargetPlatform
-import org.jetbrains.kotlin.resolve.constants.ConstantValue
-import org.jetbrains.kotlin.serialization.deserialization.AnnotationAndConstantLoader
-import org.jetbrains.kotlin.serialization.deserialization.ClassDataFinder
+import org.jetbrains.kotlin.serialization.SerializedResourcePaths
 import org.jetbrains.kotlin.serialization.deserialization.DeserializationComponents
 import org.jetbrains.kotlin.serialization.deserialization.LocalClassResolver
+import org.jetbrains.kotlin.serialization.deserialization.NameResolver
+import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedPackageMemberScope
 import org.jetbrains.kotlin.storage.LockBasedStorageManager
 import org.jetbrains.kotlin.storage.StorageManager
 
@@ -63,7 +60,31 @@ public abstract class DeserializerForDecompilerBase(
     override fun resolveTopLevelClass(classId: ClassId) = deserializationComponents.deserializeClass(classId)
 
     protected fun createDummyPackageFragment(fqName: FqName): MutablePackageFragmentDescriptor =
-        MutablePackageFragmentDescriptor(moduleDescriptor, fqName)
+            MutablePackageFragmentDescriptor(moduleDescriptor, fqName)
+
+    protected fun getDescriptorsFromPackageFile(
+            packageFqName: FqName,
+            paths: SerializedResourcePaths,
+            log: Logger,
+            nameResolver: NameResolver
+    ): List<DeclarationDescriptor> {
+        assert(packageFqName == directoryPackageFqName) {
+            "Was called for $packageFqName; only members of $directoryPackageFqName package are expected."
+        }
+        val packageFilePath = paths.getPackageFilePath(directoryPackageFqName).substringAfterLast("/")
+        val file = packageDirectory.findChild(packageFilePath)
+        if (file == null) {
+            log.error("Could not read data for package $packageFqName; $packageFilePath absent in $packageDirectory")
+            return emptyList()
+        }
+
+        val content = file.contentsToByteArray(false)
+        val packageProto = content.toPackageProto(paths.extensionRegistry)
+        val membersScope = DeserializedPackageMemberScope(
+                createDummyPackageFragment(packageFqName), packageProto, nameResolver, deserializationComponents
+        ) { emptyList() }
+        return membersScope.getContributedDescriptors().toList()
+    }
 
     private fun createDummyModule(name: String) = ModuleDescriptorImpl(Name.special("<$name>"), storageManager, ModuleParameters.Empty, targetPlatform.builtIns)
 

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/textBuilder/ResolverForDecompiler.kt

@@ -24,5 +24,5 @@ import org.jetbrains.kotlin.name.ClassId
 public interface ResolverForDecompiler {
     public fun resolveTopLevelClass(classId: ClassId): ClassDescriptor?
 
-    public fun resolveDeclarationsInFacade(facadeFqName: FqName): Collection<DeclarationDescriptor>
+    public fun resolveDeclarationsInFacade(facadeFqName: FqName): List<DeclarationDescriptor>
 }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/util/ProjectRootsUtil.kt

@@ -16,14 +16,18 @@
 
 package org.jetbrains.kotlin.idea.util
 
-import com.intellij.openapi.roots.ProjectFileIndex
-import com.intellij.psi.PsiElement
-import org.jetbrains.kotlin.idea.util.application.runReadAction
+import com.intellij.ide.highlighter.JavaClassFileType
 import com.intellij.openapi.project.Project
+import com.intellij.openapi.roots.ProjectFileIndex
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.psi.PsiDirectory
-import com.intellij.ide.highlighter.JavaClassFileType
+import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.idea.caches.resolve.JsProjectDetector
+import org.jetbrains.kotlin.idea.decompiler.builtIns.KotlinBuiltInClassFileType
+import org.jetbrains.kotlin.idea.decompiler.builtIns.KotlinBuiltInPackageFileType
+import org.jetbrains.kotlin.idea.util.application.runReadAction
+
+private val classFileLike = setOf(JavaClassFileType.INSTANCE, KotlinBuiltInClassFileType, KotlinBuiltInPackageFileType)
 
 public object ProjectRootsUtil {
     @JvmStatic
@@ -42,7 +46,7 @@ public object ProjectRootsUtil {
                    || (includeLibraryClasses && fileIndex.isLibraryClassFile(file))
         }
         // NOTE: the following is a workaround for cases when class files are under library source roots and source files are under class roots
-        val isClassFile = file.getFileType() == JavaClassFileType.INSTANCE
+        val isClassFile = file.fileType in classFileLike
         return (includeLibraryClasses && isClassFile && fileIndex.isInLibraryClasses(file))
                || (includeLibrarySource && !isClassFile && fileIndex.isInLibrarySource(file))
     }

idea/idea-test-framework/src/org/jetbrains/kotlin/idea/test/testUtils.kt

@@ -33,7 +33,7 @@ import org.jetbrains.kotlin.diagnostics.rendering.DefaultErrorMessages
 import org.jetbrains.kotlin.idea.caches.resolve.LibraryModificationTracker
 import org.jetbrains.kotlin.idea.caches.resolve.analyzeFullyAndGetResult
 import org.jetbrains.kotlin.idea.decompiler.KotlinDecompiledFileViewProvider
-import org.jetbrains.kotlin.idea.decompiler.classFile.KtClsFile
+import org.jetbrains.kotlin.idea.decompiler.KtDecompiledFile
 import org.jetbrains.kotlin.idea.references.BuiltInsReferenceResolver
 import org.jetbrains.kotlin.psi.KtFile
 import java.util.*
@@ -106,7 +106,7 @@ public fun unInvalidateBuiltinsAndStdLib(project: Project, runnable: RunnableWit
 
     builtInsSources.forEach { unInvalidateFile(it) }
     stdLibViewProviders.forEach {
-        it.allFiles.forEach { unInvalidateFile(it as KtClsFile) }
+        it.allFiles.forEach { unInvalidateFile(it as KtDecompiledFile) }
         vFileToViewProviderMap.set(it.virtualFile, it)
     }
 }

idea/src/META-INF/plugin.xml

@@ -275,7 +275,7 @@
 
     <projectService serviceInterface="org.jetbrains.kotlin.idea.caches.resolve.ClsJavaStubByVirtualFileCache"
                     serviceImplementation="org.jetbrains.kotlin.idea.caches.resolve.ClsJavaStubByVirtualFileCache"/>
-      
+
     <projectService serviceInterface="org.jetbrains.kotlin.console.KotlinConsoleKeeper"
                     serviceImplementation="org.jetbrains.kotlin.console.KotlinConsoleKeeper"/>
 
@@ -293,6 +293,7 @@
 
     <fileTypeFactory implementation="org.jetbrains.kotlin.idea.KotlinFileTypeFactory"/>
     <fileTypeFactory implementation="org.jetbrains.kotlin.idea.KotlinJavaScriptMetaFileTypeFactory"/>
+    <fileTypeFactory implementation="org.jetbrains.kotlin.idea.KotlinBuiltInFileTypeFactory"/>
     <fileTypeFactory implementation="org.jetbrains.kotlin.idea.KotlinModuleFileFactory"/>
 
     <compileServer.plugin classpath="jps/kotlin-jps-plugin.jar;kotlin-runtime.jar;kotlin-reflect.jar;kotlin-plugin.jar;kotlin-android-extensions-plugin.jar;kotlin-android-extensions-compiler-plugin.jar"/>
@@ -560,6 +561,7 @@
 
     <psi.classFileDecompiler implementation="org.jetbrains.kotlin.idea.decompiler.classFile.KotlinClassFileDecompiler"/>
     <psi.classFileDecompiler implementation="org.jetbrains.kotlin.idea.decompiler.js.KotlinJavaScriptMetaFileDecompiler"/>
+    <psi.classFileDecompiler implementation="org.jetbrains.kotlin.idea.decompiler.builtIns.KotlinBuiltInDecompiler"/>
 
     <fileBasedIndex implementation="org.jetbrains.kotlin.idea.versions.KotlinAbiVersionIndex"/>
     <fileBasedIndex implementation="org.jetbrains.kotlin.idea.versions.KotlinJavaScriptAbiVersionIndex"/>
@@ -1300,11 +1302,17 @@
     <referenceImporter implementation="org.jetbrains.kotlin.idea.quickfix.KotlinReferenceImporter"/>
 
     <fileType.fileViewProviderFactory filetype="KJSM" implementationClass="com.intellij.psi.ClassFileViewProviderFactory"/>
-
     <filetype.stubBuilder filetype="KJSM" implementationClass="com.intellij.psi.impl.compiled.ClassFileStubBuilder"/>
-
     <filetype.decompiler filetype="KJSM" implementationClass="com.intellij.psi.impl.compiled.ClassFileDecompiler"/>
 
+    <fileType.fileViewProviderFactory filetype="kotlin_class" implementationClass="com.intellij.psi.ClassFileViewProviderFactory"/>
+    <filetype.stubBuilder filetype="kotlin_class" implementationClass="com.intellij.psi.impl.compiled.ClassFileStubBuilder"/>
+    <filetype.decompiler filetype="kotlin_class" implementationClass="com.intellij.psi.impl.compiled.ClassFileDecompiler"/>
+
+    <fileType.fileViewProviderFactory filetype="kotlin_package" implementationClass="com.intellij.psi.ClassFileViewProviderFactory"/>
+    <filetype.stubBuilder filetype="kotlin_package" implementationClass="com.intellij.psi.impl.compiled.ClassFileStubBuilder"/>
+    <filetype.decompiler filetype="kotlin_package" implementationClass="com.intellij.psi.impl.compiled.ClassFileDecompiler"/>
+
     <pathMacroExpandableProtocol protocol="kotlin-js-meta"/>
   </extensions>
 

idea/src/org/jetbrains/kotlin/idea/KotlinBuiltInFileTypeFactory.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jetbrains.kotlin.idea
+
+import com.intellij.openapi.fileTypes.FileTypeConsumer
+import com.intellij.openapi.fileTypes.FileTypeFactory
+import org.jetbrains.kotlin.idea.decompiler.builtIns.KotlinBuiltInClassFileType
+import org.jetbrains.kotlin.idea.decompiler.builtIns.KotlinBuiltInPackageFileType
+
+class KotlinBuiltInFileTypeFactory : FileTypeFactory() {
+    override fun createFileTypes(consumer: FileTypeConsumer) {
+        consumer.consume(KotlinBuiltInClassFileType, KotlinBuiltInClassFileType.defaultExtension)
+        consumer.consume(KotlinBuiltInPackageFileType, KotlinBuiltInPackageFileType.defaultExtension)
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/decompiler/textBuilder/TextConsistencyBaseTest.kt

@@ -77,7 +77,7 @@ public abstract class TextConsistencyBaseTest : KotlinLightCodeInsightFixtureTes
         override fun resolveTopLevelClass(classId: ClassId): ClassDescriptor? =
                 module.resolveTopLevelClass(classId.asSingleFqName(), NoLookupLocation.FROM_TEST)
 
-        override fun resolveDeclarationsInFacade(facadeFqName: FqName): Collection<DeclarationDescriptor> =
+        override fun resolveDeclarationsInFacade(facadeFqName: FqName): List<DeclarationDescriptor> =
                 module.getPackage(facadeFqName.parent()).memberScope.getContributedDescriptors().filter {
                     it is CallableMemberDescriptor &&
                     it.module != module.builtIns.builtInsModule &&