Fix ObjCExport mangling top-levels in different files in two-stage mode

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExportNamer.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.backend.konan.objcexport
 
+import org.jetbrains.kotlin.backend.common.serialization.findSourceFile
 import org.jetbrains.kotlin.backend.konan.cKeywords
 import org.jetbrains.kotlin.backend.konan.descriptors.isArray
 import org.jetbrains.kotlin.backend.konan.descriptors.isInterface
@@ -22,6 +23,7 @@ import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
 import org.jetbrains.kotlin.resolve.descriptorUtil.isSubclassOf
 import org.jetbrains.kotlin.resolve.descriptorUtil.module
+import org.jetbrains.kotlin.resolve.descriptorUtil.propertyIfAccessor
 import org.jetbrains.kotlin.resolve.source.PsiSourceFile
 
 internal interface ObjCExportNameTranslator {
@@ -791,7 +793,7 @@ private fun ObjCExportMapper.canBeInheritedBySameClass(
 ): Boolean {
     if (this.isTopLevel(first) || this.isTopLevel(second)) {
         return this.isTopLevel(first) && this.isTopLevel(second) &&
-                first.source.containingFile == second.source.containingFile
+                first.propertyIfAccessor.findSourceFile() == second.propertyIfAccessor.findSourceFile()
     }
 
     val firstClass = this.getClassIfCategory(first) ?: first.containingDeclaration as ClassDescriptor

backend.native/tests/objcexport/expectedLazy.h

@@ -607,6 +607,20 @@ __attribute__((swift_name("ThrowsEmptyKt")))
 + (BOOL)throwsEmptyAndReturnError:(NSError * _Nullable * _Nullable)error __attribute__((swift_name("throwsEmpty()")));
 @end;
 
+__attribute__((objc_subclassing_restricted))
+__attribute__((swift_name("TopLevelManglingAKt")))
+@interface KtTopLevelManglingAKt : KtBase
++ (NSString *)foo __attribute__((swift_name("foo()")));
+@property (class, readonly) NSString *bar __attribute__((swift_name("bar")));
+@end;
+
+__attribute__((objc_subclassing_restricted))
+__attribute__((swift_name("TopLevelManglingBKt")))
+@interface KtTopLevelManglingBKt : KtBase
++ (NSString *)foo __attribute__((swift_name("foo()")));
+@property (class, readonly) NSString *bar __attribute__((swift_name("bar")));
+@end;
+
 __attribute__((objc_subclassing_restricted))
 __attribute__((swift_name("DelegateClass")))
 @interface KtDelegateClass : KtBase <KtKotlinReadWriteProperty>

backend.native/tests/objcexport/topLevelMangling.swift

@@ -0,0 +1,20 @@
+import Kt
+
+private func testFunctionsInDifferentFilesAreNotMangled() throws {
+    try assertEquals(actual: TopLevelManglingAKt.foo(), expected: "a1")
+    try assertEquals(actual: TopLevelManglingBKt.foo(), expected: "b1")
+}
+
+private func testPropertiesInDifferentFilesAreNotMangled() throws {
+    try assertEquals(actual: TopLevelManglingAKt.bar, expected: "a2")
+    try assertEquals(actual: TopLevelManglingBKt.bar, expected: "b2")
+}
+
+class TopLevelManglingTests : SimpleTestProvider {
+    override init() {
+        super.init()
+
+        test("TestFunctionsInDifferentFilesAreNotMangled", testFunctionsInDifferentFilesAreNotMangled)
+        test("TestPropertiesInDifferentFilesAreNotMangled", testPropertiesInDifferentFilesAreNotMangled)
+    }
+}

backend.native/tests/objcexport/topLevelManglingA.kt

@@ -0,0 +1,4 @@
+package topLevelManglingA
+
+fun foo() = "a1"
+val bar = "a2"

backend.native/tests/objcexport/topLevelManglingB.kt

@@ -0,0 +1,4 @@
+package topLevelManglingB
+
+fun foo() = "b1"
+val bar = "b2"