[Metadata] Add platform dependent type transformer

- Fix forward declaration type construction

compiler/util-klib-metadata/src/org/jetbrains/kotlin/library/metadata/KlibMetadataFactories.kt

@@ -9,6 +9,7 @@ import org.jetbrains.kotlin.backend.common.serialization.metadata.KlibMetadataDe
 import org.jetbrains.kotlin.backend.common.serialization.metadata.KlibMetadataModuleDescriptorFactory
 import org.jetbrains.kotlin.backend.common.serialization.metadata.impl.KlibMetadataDeserializedPackageFragmentsFactoryImpl
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.descriptors.deserialization.PlatformDependentTypeTransformer
 import org.jetbrains.kotlin.descriptors.konan.KlibModuleDescriptorFactory
 import org.jetbrains.kotlin.descriptors.konan.impl.KlibModuleDescriptorFactoryImpl
 import org.jetbrains.kotlin.serialization.deserialization.FlexibleTypeDeserializer
@@ -22,9 +23,13 @@ import org.jetbrains.kotlin.storage.StorageManager
  */
 open class KlibMetadataFactories(
     createBuiltIns:(StorageManager) -> KotlinBuiltIns,
-    val flexibleTypeDeserializer: FlexibleTypeDeserializer
+    val flexibleTypeDeserializer: FlexibleTypeDeserializer,
+    val platformDependentTypeTransformer: PlatformDependentTypeTransformer
 ) {
 
+    constructor(createBuiltIns:(StorageManager) -> KotlinBuiltIns, flexibleTypeDeserializer: FlexibleTypeDeserializer) :
+            this(createBuiltIns, flexibleTypeDeserializer, PlatformDependentTypeTransformer.None)
+
     /**
      * The default [KlibModuleDescriptorFactory] factory instance.
      */
@@ -54,7 +59,12 @@ open class KlibMetadataFactories(
         descriptorFactory: KlibModuleDescriptorFactory,
         packageFragmentsFactory: KlibMetadataDeserializedPackageFragmentsFactory
     ): KlibMetadataModuleDescriptorFactory =
-        KlibMetadataModuleDescriptorFactoryImpl(descriptorFactory, packageFragmentsFactory, flexibleTypeDeserializer)
+        KlibMetadataModuleDescriptorFactoryImpl(
+            descriptorFactory,
+            packageFragmentsFactory,
+            flexibleTypeDeserializer,
+            platformDependentTypeTransformer
+        )
 
     fun createDefaultKonanResolvedModuleDescriptorsFactory(
         moduleDescriptorFactory: KlibMetadataModuleDescriptorFactory

compiler/util-klib-metadata/src/org/jetbrains/kotlin/library/metadata/KlibMetadataModuleDescriptorFactory.kt

@@ -4,6 +4,7 @@ import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.PackageFragmentProvider
+import org.jetbrains.kotlin.descriptors.deserialization.PlatformDependentTypeTransformer
 import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
 import org.jetbrains.kotlin.descriptors.konan.KlibModuleDescriptorFactory
 import org.jetbrains.kotlin.library.KotlinLibrary
@@ -17,6 +18,7 @@ interface KlibMetadataModuleDescriptorFactory {
     val descriptorFactory: KlibModuleDescriptorFactory
     val packageFragmentsFactory: KlibMetadataDeserializedPackageFragmentsFactory
     val flexibleTypeDeserializer: FlexibleTypeDeserializer
+    val platformDependentTypeTransformer: PlatformDependentTypeTransformer
 
     fun createDescriptor(
         library: KotlinLibrary,

compiler/util-klib-metadata/src/org/jetbrains/kotlin/library/metadata/NativeTypeTransformer.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.library.metadata
+
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
+import org.jetbrains.kotlin.descriptors.deserialization.PlatformDependentTypeTransformer
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.types.SimpleType
+import org.jetbrains.kotlin.types.SupposititiousSimpleType
+
+class NativeTypeTransformer : PlatformDependentTypeTransformer {
+    override fun transformPlatformType(classId: ClassId, computedType: SimpleType): SimpleType {
+        val originalPackageFqn = classId.packageFqName
+        if (originalPackageFqn in forwardPackagesSet) {
+            // This hack is about keeping original class id written into proto which is required for correct IR linkage
+            val constructor = computedType.constructor
+            val classDescriptor = constructor.declarationDescriptor as ClassDescriptor
+            val realPackageFqn = (classDescriptor.containingDeclaration as PackageFragmentDescriptor).fqName
+            if (originalPackageFqn != realPackageFqn) {
+                return SupposititiousSimpleType(computedType, classId)
+            }
+        }
+
+        return computedType
+    }
+
+    companion object {
+        private val cNames = FqName("cnames")
+        private val cNamesStructs = cNames.child(Name.identifier("structs"))
+
+        private val objCNames = FqName("objcnames")
+        private val objCNamesClasses = objCNames.child(Name.identifier("classes"))
+        private val objCNamesProtocols = objCNames.child(Name.identifier("protocols"))
+
+        private val forwardPackagesSet = setOf(cNamesStructs, objCNamesClasses, objCNamesProtocols)
+    }
+}

compiler/util-klib-metadata/src/org/jetbrains/kotlin/library/metadata/impl/KlibMetadataModuleDescriptorFactoryImpl.kt

@@ -12,6 +12,7 @@ import org.jetbrains.kotlin.builtins.functions.functionInterfacePackageFragmentP
 import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.contracts.ContractDeserializerImpl
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.deserialization.PlatformDependentTypeTransformer
 import org.jetbrains.kotlin.descriptors.impl.CompositePackageFragmentProvider
 import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
 import org.jetbrains.kotlin.descriptors.konan.DeserializedKlibModuleOrigin
@@ -36,7 +37,8 @@ private val ModuleDescriptorImpl.isStdlibModule
 class KlibMetadataModuleDescriptorFactoryImpl(
     override val descriptorFactory: KlibModuleDescriptorFactory,
     override val packageFragmentsFactory: KlibMetadataDeserializedPackageFragmentsFactory,
-    override val flexibleTypeDeserializer: FlexibleTypeDeserializer
+    override val flexibleTypeDeserializer: FlexibleTypeDeserializer,
+    override val platformDependentTypeTransformer: PlatformDependentTypeTransformer
 ) : KlibMetadataModuleDescriptorFactory {
 
     override fun createDescriptorOptionalBuiltIns(
@@ -151,7 +153,8 @@ class KlibMetadataModuleDescriptorFactoryImpl(
             notFoundClasses,
             ContractDeserializerImpl(configuration, storageManager),
             extensionRegistryLite = KlibMetadataSerializerProtocol.extensionRegistry,
-            samConversionResolver = SamConversionResolverImpl(storageManager, samWithReceiverResolvers = emptyList())
+            samConversionResolver = SamConversionResolverImpl(storageManager, samWithReceiverResolvers = emptyList()),
+            platformDependentTypeTransformer = platformDependentTypeTransformer
         )
 
         fragmentsToInitialize.forEach {