[optmz] Fix for https://youtrack.jetbrains.com/issue/KT-41907 + test

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/BitcodePhases.kt

@@ -211,13 +211,25 @@ internal val escapeAnalysisPhase = makeKonanModuleOpPhase(
         op = { context, _ ->
             val entryPoint = context.ir.symbols.entryPoint?.owner
             val externalModulesDFG = ExternalModulesDFG(emptyList(), emptyMap(), emptyMap(), emptyMap())
+            val nonDevirtualizedCallSitesUnfoldFactor =
+                    if (entryPoint != null) {
+                        // For a final program it can be safely assumed that what classes we see is what we got,
+                        // so can take those. In theory we can always unfold call sites using type hierarchy, but
+                        // the analysis might converge much, much slower, so take only reasonably small for now.
+                        5
+                    }
+                    else {
+                        // Can't tolerate any non-devirtualized call site for a library.
+                        // TODO: What about private virtual functions?
+                        // Note: 0 is also bad - this means that there're no inheritors in the current source set,
+                        // but there might be some provided by the users of the library being produced.
+                        -1
+                    }
             val callGraph = CallGraphBuilder(
                     context, context.moduleDFG!!,
                     externalModulesDFG,
                     context.devirtualizationAnalysisResult!!,
-                    // Can't tolerate any non-devirtualized call site for a library.
-                    // TODO: What about private virtual functions?
-                    nonDevirtualizedCallSitesUnfoldFactor = if (entryPoint == null) 0 else 5
+                    nonDevirtualizedCallSitesUnfoldFactor
             ).build()
             EscapeAnalysis.computeLifetimes(
                     context, context.moduleDFG!!, externalModulesDFG, callGraph, context.lifetimes

backend.native/tests/objcexport/expectedLazy.h

@@ -532,6 +532,26 @@ __attribute__((swift_name("Kt39206Kt")))
 + (int32_t)myFunc __attribute__((swift_name("myFunc()"))) __attribute__((deprecated("Don't call this\nPlease")));
 @end;
 
+__attribute__((objc_subclassing_restricted))
+__attribute__((swift_name("Ckt41907")))
+@interface KtCkt41907 : KtBase
+- (instancetype)init __attribute__((swift_name("init()"))) __attribute__((objc_designated_initializer));
++ (instancetype)new __attribute__((availability(swift, unavailable, message="use object initializers instead")));
+@end;
+
+__attribute__((swift_name("Ikt41907")))
+@protocol KtIkt41907
+@required
+- (void)fooC:(KtCkt41907 *)c __attribute__((swift_name("foo(c:)")));
+@end;
+
+__attribute__((objc_subclassing_restricted))
+__attribute__((swift_name("Kt41907Kt")))
+@interface KtKt41907Kt : KtBase
++ (void)escapeCC:(KtCkt41907 *)c __attribute__((swift_name("escapeC(c:)")));
++ (void)testKt41907O:(id<KtIkt41907>)o __attribute__((swift_name("testKt41907(o:)")));
+@end;
+
 __attribute__((objc_subclassing_restricted))
 __attribute__((swift_name("LibraryKt")))
 @interface KtLibraryKt : KtBase

backend.native/tests/objcexport/kt41907.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+package kt41907
+
+class Ckt41907
+
+interface Ikt41907 {
+    fun foo(c: Ckt41907)
+}
+
+private class Bkt41907 {
+    var c: Ckt41907? = null
+}
+
+private val b = Bkt41907()
+
+fun escapeC(c: Ckt41907) {
+    b.c = c
+}
+
+fun testKt41907(o: Ikt41907) {
+    val c = Ckt41907()
+    o.foo(c)
+}

backend.native/tests/objcexport/kt41907.swift

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+import Kt
+
+class Ikt41907Impl : Ikt41907 {
+    func foo(c: Ckt41907) {
+        Kt41907Kt.escapeC(c: c)
+    }
+}
+
+private func test1() {
+    Kt41907Kt.testKt41907(o: Ikt41907Impl())
+}
+
+class Kt41907Tests : SimpleTestProvider {
+    override init() {
+        super.init()
+
+        test("Test1", test1)
+    }
+}