Use internal names in multifile class metadata

To reuse the strings already existing in the constant pool of the class file

compiler/backend/src/org/jetbrains/kotlin/codegen/MultifileClassCodegen.kt

@@ -25,7 +25,6 @@ import org.jetbrains.kotlin.codegen.context.MethodContext
 import org.jetbrains.kotlin.codegen.state.GenerationState
 import org.jetbrains.kotlin.config.IncrementalCompilation
 import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
-import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
 import org.jetbrains.kotlin.diagnostics.DiagnosticUtils
 import org.jetbrains.kotlin.fileClasses.JvmFileClassUtil
@@ -57,7 +56,6 @@ import org.jetbrains.org.objectweb.asm.Type
 import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
 import java.util.*
 
-
 public class MultifileClassCodegen(
         private val state: GenerationState,
         public val files: Collection<JetFile>,
@@ -200,7 +198,7 @@ public class MultifileClassCodegen(
 
         val builder = state.factory.newVisitor(MultifileClassPart(file, packageFragment, facadeFqName), partType, file)
 
-        MultifileClassPartCodegen(builder, file, partType, facadeFqName, partContext, state).generate()
+        MultifileClassPartCodegen(builder, file, partType, facadeClassType, partContext, state).generate()
 
         val facadeContext = state.rootContext.intoMultifileClass(packageFragment, facadeClassType, partType)
         val memberCodegen = createCodegenForPartOfMultifileFacade(facadeContext)
@@ -280,12 +278,12 @@ public class MultifileClassCodegen(
         val av = classBuilder.newAnnotation(AsmUtil.asmDescByFqNameWithoutInnerClasses(JvmAnnotationNames.KOTLIN_MULTIFILE_CLASS), true)
         JvmCodegenUtil.writeAbiVersion(av)
 
-        val shortNames = partFqNames.map { it.shortName().asString() }.sorted()
-        val filePartClassNamesArray = av.visitArray(JvmAnnotationNames.FILE_PART_CLASS_NAMES_FIELD_NAME)
-        for (shortName in shortNames) {
-            filePartClassNamesArray.visit(null, shortName)
+        val partInternalNames = partFqNames.map { JvmClassName.byFqNameWithoutInnerClasses(it).internalName }.sorted()
+        val arv = av.visitArray(JvmAnnotationNames.FILE_PART_CLASS_NAMES_FIELD_NAME)
+        for (internalName in partInternalNames) {
+            arv.visit(null, internalName)
         }
-        filePartClassNamesArray.visitEnd()
+        arv.visitEnd()
 
         av.visitEnd()
     }

compiler/backend/src/org/jetbrains/kotlin/codegen/MultifileClassPartCodegen.kt

@@ -22,7 +22,6 @@ import org.jetbrains.kotlin.codegen.serialization.JvmSerializerExtension
 import org.jetbrains.kotlin.codegen.state.GenerationState
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.load.java.JvmAnnotationNames
-import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.JetFile
 import org.jetbrains.kotlin.psi.JetNamedFunction
 import org.jetbrains.kotlin.psi.JetProperty
@@ -36,7 +35,7 @@ public class MultifileClassPartCodegen(
         v: ClassBuilder,
         file: JetFile,
         private val filePartType: Type,
-        private val multifileClassFqName: FqName,
+        private val multifileClassType: Type,
         partContext: FieldOwnerContext<*>,
         state: GenerationState
 ) : MemberCodegen<JetFile>(state, null, partContext, file, v) {
@@ -97,7 +96,7 @@ public class MultifileClassPartCodegen(
 
         val av = v.newAnnotation(AsmUtil.asmDescByFqNameWithoutInnerClasses(JvmAnnotationNames.KOTLIN_MULTIFILE_CLASS_PART), true)
         AsmUtil.writeAnnotationData(av, serializer, packageProto)
-        av.visit(JvmAnnotationNames.MULTIFILE_CLASS_NAME_FIELD_NAME, multifileClassFqName.shortName().asString())
+        av.visit(JvmAnnotationNames.MULTIFILE_CLASS_NAME_FIELD_NAME, multifileClassType.internalName)
         av.visitEnd()
     }
 }

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaPackageScope.kt

@@ -61,7 +61,7 @@ public class LazyJavaPackageScope(
                 KotlinClassHeader.Kind.MULTIFILE_CLASS_PART -> {
                     val partName = kotlinClass.classId.shortClassName.asString()
                     val facadeName = header.multifileClassName ?: continue@kotlinClasses
-                    result[partName] = facadeName
+                    result[partName] = facadeName.substringAfterLast('/')
                 }
                 KotlinClassHeader.Kind.FILE_FACADE -> {
                     val fileFacadeName = kotlinClass.classId.shortClassName.asString()

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/DecompiledUtils.kt

@@ -89,9 +89,6 @@ public fun findMultifileClassParts(file: VirtualFile, multifileClass: KotlinJvmB
     val partsFinder = DirectoryBasedClassFinder(file.parent!!, packageFqName)
     val partNames = multifileClass.classHeader.filePartClassNames ?: return emptyList()
     return partNames.map {
-        partsFinder.findKotlinClass(ClassId(packageFqName, Name.identifier(it)))
+        partsFinder.findKotlinClass(ClassId(packageFqName, Name.identifier(it.substringAfterLast('/'))))
     }.filterNotNull()
 }
-
-public fun readMultifileClassPartHeaders(file: VirtualFile, multifileClass: KotlinJvmBinaryClass): List<KotlinClassHeader> =
-        findMultifileClassParts(file, multifileClass).map { it.classHeader }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/stubBuilder/clsStubBuilding.kt

@@ -80,7 +80,7 @@ fun createMultifileClassStub(
         components: ClsStubBuilderComponents
 ): KotlinFileStubImpl {
     val packageFqName = facadeFqName.parent()
-    val partNames = multifileClass.classHeader.filePartClassNames?.asList()
+    val partNames = multifileClass.classHeader.filePartClassNames?.asList()?.map { it.substringAfterLast('/') }
     val fileStub = KotlinFileStubForIde.forMultifileClassStub(facadeFqName, partNames, packageFqName.isRoot)
     setupFileStub(fileStub, packageFqName)
     for (partFile in partFiles) {

jps-plugin/src/org/jetbrains/kotlin/jps/incremental/IncrementalCacheImpl.kt

@@ -198,7 +198,8 @@ public class IncrementalCacheImpl(
                 inlineFunctionsMap.process(kotlinClass)
             }
             header.isCompatibleMultifileClassKind() -> {
-                val partNames = getFullNamesOfMultifileClassParts(kotlinClass)
+                val partNames = kotlinClass.classHeader.filePartClassNames?.toList()
+                                ?: throw AssertionError("Multifile class has no parts: ${kotlinClass.className}")
                 multifileClassFacadeMap.add(className, partNames)
 
                 // TODO NO_CHANGES? (delegates only, see package facade)
@@ -208,8 +209,7 @@ public class IncrementalCacheImpl(
             header.isCompatibleMultifileClassPartKind() -> {
                 assert(sourceFiles.size() == 1) { "Multifile class part from several source files: $sourceFiles" }
                 packagePartMap.addPackagePart(className)
-                val facadeClassName = getInternalNameOfTopLevelClassInTheSamePackage(kotlinClass, header.multifileClassName!!)
-                multifileClassPartMap.add(className.internalName, facadeClassName)
+                multifileClassPartMap.add(className.internalName, header.multifileClassName!!)
 
                 protoMap.process(kotlinClass, isPackage = true) +
                 constantsMap.process(kotlinClass) +
@@ -698,21 +698,6 @@ private fun ByteArray.md5(): Long {
            )
 }
 
-private fun getInternalNameOfTopLevelClassInTheSamePackage(kotlinClass: KotlinJvmBinaryClass, simpleName: String): String {
-    val classFqName = kotlinClass.classId.packageFqName.child(Name.identifier(simpleName))
-    return JvmClassName.byFqNameWithoutInnerClasses(classFqName).internalName
-}
-
-private fun getFullNamesOfMultifileClassParts(kotlinClass: LocalFileKotlinClass): List<String> {
-    val classHeader = kotlinClass.classHeader
-    val partClassNames = classHeader.filePartClassNames ?: throw AssertionError("Multifile class has no parts: ${kotlinClass.className}")
-    val fullNames = arrayListOf<String>()
-    for (shortName in partClassNames) {
-        fullNames.add(getInternalNameOfTopLevelClassInTheSamePackage(kotlinClass, shortName))
-    }
-    return fullNames
-}
-
 private abstract class StringMapExternalizer<T> : DataExternalizer<Map<String, T>> {
     override fun save(out: DataOutput, map: Map<String, T>?) {
         out.writeInt(map!!.size())