Support OptionalExpectation in serializer (#2048)

* [serializer] Support OptionalExpectation

* Fix OptionalExectation test for Windows

* [tests] Don't print compiler args by default

backend.native/build.gradle

@@ -185,6 +185,7 @@ targetList.each { target ->
                 '-Xuse-experimental=kotlin.ExperimentalMultiplatform',
                 '-Xallow-result-return-type',
                 commonSrc.absolutePath,
+                "-Xcommon-sources=${commonSrc.absolutePath}",
                 project(':Interop:Runtime').file('src/main/kotlin'),
                 project(':Interop:Runtime').file('src/native/kotlin'),
                 project(':Interop:JsRuntime').file('src/main/kotlin'),

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/serialization/DescriptorTable.kt

@@ -18,6 +18,7 @@ import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.resolve.DescriptorUtils
+import org.jetbrains.kotlin.resolve.checkers.ExpectedActualDeclarationChecker
 import org.jetbrains.kotlin.resolve.constants.StringValue
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.types.TypeUtils
@@ -36,6 +37,9 @@ internal fun DeclarationDescriptor.symbolName(): String = when (this) {
 internal val DeclarationDescriptor.uniqId 
     get() = this.symbolName().localHash.value
 
+internal val DeclarationDescriptor.isSerializableExpectClass: Boolean
+    get() = this is ClassDescriptor && ExpectedActualDeclarationChecker.shouldGenerateExpectClass(this)
+
 
 // TODO: We don't manage id clashes anyhow now.
 class DescriptorTable(val builtIns: IrBuiltIns) {
@@ -95,7 +99,7 @@ val IrBuiltIns.irBuiltInDescriptors
  * and so should be computable from the descriptor itself without checking a backend state.
  */
 internal tailrec fun DeclarationDescriptor.isExported(): Boolean {
-    assert(!this.isExpectMember) { this }
+    assert(!this.isExpectMember || this.isSerializableExpectClass) { this }
 
     if (this.annotations.findAnnotation(ContractsDslNames.CONTRACTS_DSL_ANNOTATION_FQN) != null) {
         // TODO: Seems like this should be deleted in PsiToIR.

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/serialization/KonanSerializationUtil.kt

@@ -15,6 +15,7 @@ import org.jetbrains.kotlin.metadata.deserialization.BinaryVersion
 import org.jetbrains.kotlin.metadata.konan.KonanProtoBuf
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.resolve.DescriptorUtils
+import org.jetbrains.kotlin.resolve.checkers.ExpectedActualDeclarationChecker
 import org.jetbrains.kotlin.resolve.descriptorUtil.module
 import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
 import org.jetbrains.kotlin.serialization.KonanDescriptorSerializer
@@ -83,7 +84,7 @@ internal class KonanSerializationUtil(val context: Context, metadataVersion: Bin
         val classifierDescriptors = KonanDescriptorSerializer.sort(
                 fragments.flatMap {
                     it.getMemberScope().getContributedDescriptors(DescriptorKindFilter.CLASSIFIERS)
-                }.filter { !it.isExpectMember }
+                }.filter { !it.isExpectMember || it.isSerializableExpectClass }
         )
 
         val members = fragments.flatMap { fragment ->

backend.native/tests/build.gradle

@@ -2317,7 +2317,7 @@ task mpp_optional_expectation(type: RunStandaloneKonanTest) {
     def outputRoot = project.ext."$outputSourceSetName"
     flags = [
             '-Xmulti-platform',
-            "-Xcommon-sources=${file("$outputRoot/$name/mpp_optional_expectation.kt")}"
+            "-Xcommon-sources=$outputRoot/$name/mpp_optional_expectation.kt"
     ]
 }
 

backend.native/tests/codegen/mpp/mpp_optional_expectation.kt

@@ -1,10 +1,17 @@
 @file:Suppress("EXPERIMENTAL_API_USAGE_ERROR")
+
+import kotlin.js.*
+
 @OptionalExpectation
 expect annotation class Optional()
 
 @Optional
 fun foo() { println(42) }
 
+@JsName("jsBar")
+fun bar() { println(43) }
+
 fun main(args: Array<String>) {
     foo()
+    bar()
 }