Support free-form .knm package part names

idea/idea-native/src/org/jetbrains/kotlin/ide/konan/KotlinNativePluginUtil.kt

@@ -105,9 +105,9 @@ internal object CachingIdeMetadataReaderImpl : MetadataReader {
     override fun loadSerializedPackageFragment(
         libraryLayout: KonanLibraryLayout,
         packageFqName: String,
-        partIndex: Int
+        partName: String
     ): KonanProtoBuf.LinkDataPackageFragment =
-        cache.getCachedPackageFragment(libraryLayout.getVirtualFile(libraryLayout.packageFragmentFile(packageFqName, partIndex)))
+        cache.getCachedPackageFragment(libraryLayout.getVirtualFile(libraryLayout.packageFragmentFile(packageFqName, partName)))
 
     private fun KonanLibraryLayout.getVirtualFile(file: File): VirtualFile {
         val source = this.source

konan/library-reader/src/org/jetbrains/kotlin/konan/library/KonanLibrary.kt

@@ -44,8 +44,8 @@ interface KonanLibrary {
 
     val dataFlowGraph: ByteArray?
     val moduleHeaderData: KonanProtoBuf.LinkDataLibrary
-    fun packageMetadataPartCount(fqName: String): Int
-    fun packageMetadata(packageFqName: String, partIndex: Int): KonanProtoBuf.LinkDataPackageFragment
+    fun packageMetadataParts(fqName: String): Set<String>
+    fun packageMetadata(packageFqName: String, partName: String): KonanProtoBuf.LinkDataPackageFragment
 }
 
 val KonanLibrary.uniqueName

konan/library-reader/src/org/jetbrains/kotlin/konan/library/KonanLibraryLayout.kt

@@ -38,8 +38,8 @@ interface KonanLibraryLayout {
     fun packageFragmentsDir(packageFqName: String) =
         File(linkdataDir, if (packageFqName == "") "root_package" else "package_$packageFqName")
 
-    fun packageFragmentFile(packageFqName: String, partIndex: Int) =
-        File(packageFragmentsDir(packageFqName), "$partIndex$KLIB_METADATA_FILE_EXTENSION_WITH_DOT")
+    fun packageFragmentFile(packageFqName: String, partName: String) =
+        File(packageFragmentsDir(packageFqName), "$partName$KLIB_METADATA_FILE_EXTENSION_WITH_DOT")
 }
 
 sealed class KonanLibrarySource {

konan/library-reader/src/org/jetbrains/kotlin/konan/library/KonanMetadataReader.kt

@@ -12,6 +12,6 @@ interface MetadataReader {
     fun loadSerializedPackageFragment(
         libraryLayout: KonanLibraryLayout,
         packageFqName: String,
-        partIndex: Int
+        partName: String
     ): KonanProtoBuf.LinkDataPackageFragment
 }

konan/library-reader/src/org/jetbrains/kotlin/konan/library/impl/DefaultMetadataReaderImpl.kt

@@ -19,9 +19,9 @@ object DefaultMetadataReaderImpl : MetadataReader {
     override fun loadSerializedPackageFragment(
         libraryLayout: KonanLibraryLayout,
         packageFqName: String,
-        partIndex: Int
+        partName: String
     ): KonanProtoBuf.LinkDataPackageFragment =
         parsePackageFragment(
-            libraryLayout.packageFragmentFile(packageFqName, partIndex).readBytes()
+            libraryLayout.packageFragmentFile(packageFqName, partName).readBytes()
         )
 }

konan/library-reader/src/org/jetbrains/kotlin/konan/library/impl/KonanLibraryImpl.kt

@@ -62,10 +62,25 @@ internal class KonanLibraryImpl(
 
     override val moduleHeaderData: KonanProtoBuf.LinkDataLibrary by lazy { layout.inPlace { metadataReader.loadSerializedModule(it) } }
 
-    override fun packageMetadata(packageFqName: String, partIndex: Int) = layout.inPlace { metadataReader.loadSerializedPackageFragment(it, packageFqName, partIndex) }
+    override fun packageMetadata(packageFqName: String, partName: String) =
+        layout.inPlace { metadataReader.loadSerializedPackageFragment(it, packageFqName, partName) }
+
+    override fun packageMetadataParts(fqName: String): Set<String> =
+        layout.inPlace { inPlaceLayout ->
+            val fileList =
+                inPlaceLayout.packageFragmentsDir(fqName)
+                    .listFiles
+                    .mapNotNull {
+                        it.name
+                            .substringBeforeLast(KLIB_METADATA_FILE_EXTENSION_WITH_DOT, missingDelimiterValue = "")
+                            .takeIf { it.isNotEmpty() }
+                    }
+
+            fileList.toSortedSet().also {
+                require(it.size == fileList.size) { "Duplicated names: ${fileList.groupingBy { it }.eachCount().filter { (_, count) -> count > 1 }}" }
+            }
+        }
 
-    override fun packageMetadataPartCount(fqName: String): Int =
-        layout.inPlace { it.packageFragmentsDir(fqName).listFiles.count { file -> file.extension == KLIB_METADATA_FILE_EXTENSION } }
 
     override fun toString() = "$libraryName[default=$isDefault]"
 }

konan/library-reader/src/org/jetbrains/kotlin/serialization/konan/KonanPackageFragment.kt

@@ -25,7 +25,7 @@ class KonanPackageFragment(
     private val packageAccessedHandler: PackageAccessedHandler?,
     storageManager: StorageManager,
     module: ModuleDescriptor,
-    partIndex: Int
+    partName: String
 ) : DeserializedPackageFragment(fqName, storageManager, module) {
 
     lateinit var components: DeserializationComponents
@@ -36,7 +36,7 @@ class KonanPackageFragment(
 
     // The proto field is lazy so that we can load only needed
     // packages from the library.
-    private val protoForNames: KonanProtoBuf.LinkDataPackageFragment by lazy { library.packageMetadata(fqName.asString(), partIndex) }
+    private val protoForNames: KonanProtoBuf.LinkDataPackageFragment by lazy { library.packageMetadata(fqName.asString(), partName) }
 
     val proto: KonanProtoBuf.LinkDataPackageFragment
         get() = protoForNames.also { packageAccessedHandler?.markPackageAccessed(fqName) }

konan/library-reader/src/org/jetbrains/kotlin/serialization/konan/impl/KonanDeserializedPackageFragmentsFactoryImpl.kt

@@ -38,9 +38,9 @@ internal object KonanDeserializedPackageFragmentsFactoryImpl : KonanDeserialized
         storageManager: StorageManager
     ) = packageFragmentNames.flatMap {
         val fqName = FqName(it)
-        val count = library.packageMetadataPartCount(fqName.asString())
-        List(count) { partIndex ->
-            KonanPackageFragment(fqName, library, packageAccessedHandler, storageManager, moduleDescriptor, partIndex)
+        val parts = library.packageMetadataParts(it)
+        parts.map { partName ->
+            KonanPackageFragment(fqName, library, packageAccessedHandler, storageManager, moduleDescriptor, partName)
         }
     }