Rework stubs for interop globals passed by value

#KT-21855 Fixed

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/GlobalVariableStub.kt

@@ -22,20 +22,20 @@ import org.jetbrains.kotlin.native.interop.indexer.GlobalDecl
 
 class GlobalVariableStub(global: GlobalDecl, stubGenerator: StubGenerator) : KotlinStub, NativeBacked {
 
-    val getAddressExpression: KotlinExpression
-    val header: String
-    val getter: KotlinExpression
-    val setter: KotlinExpression?
-
-    init {
-        getAddressExpression = stubGenerator.simpleBridgeGenerator.kotlinToNative(
+    private val getAddressExpression: KotlinExpression by lazy {
+        stubGenerator.simpleBridgeGenerator.kotlinToNative(
                 nativeBacked = this,
                 returnType = BridgedType.NATIVE_PTR,
                 kotlinValues = emptyList()
         ) {
             "&${global.name}"
         }
+    }
+    val header: String
+    val getter: KotlinExpression
+    val setter: KotlinExpression?
 
+    init {
         val kotlinScope = stubGenerator.kotlinFile
 
         // TODO: consider sharing the logic below with field generator.
@@ -50,14 +50,38 @@ class GlobalVariableStub(global: GlobalDecl, stubGenerator: StubGenerator) : Kot
             getter = mirror.info.argFromBridged(getAddressExpression, kotlinScope, nativeBacked = this) + "!!"
             setter = null
         } else {
-            val pointedTypeName = mirror.pointedType.render(kotlinScope)
-            val storagePointed = "interpretPointed<$pointedTypeName>($getAddressExpression)"
             if (mirror is TypeMirror.ByValue) {
+                getter = mirror.info.argFromBridged(stubGenerator.simpleBridgeGenerator.kotlinToNative(
+                        nativeBacked = this,
+                        returnType = mirror.info.bridgedType,
+                        kotlinValues = emptyList()
+                ) {
+                    mirror.info.cToBridged(expr = global.name)
+                }, kotlinScope, nativeBacked = this)
+
+                setter = if (global.isConst) {
+                    null
+                } else {
+                    val bridgedValue = BridgeTypedKotlinValue(mirror.info.bridgedType, mirror.info.argToBridged("value"))
+
+                    stubGenerator.simpleBridgeGenerator.kotlinToNative(
+                            nativeBacked = this,
+                            returnType = BridgedType.VOID,
+                            kotlinValues = listOf(bridgedValue)
+                    ) { nativeValues ->
+                        out("${global.name} = ${mirror.info.cFromBridged(
+                                nativeValues.single(),
+                                scope,
+                                nativeBacked = this@GlobalVariableStub
+                        )};")
+                        ""
+                    }
+                }
+
                 kotlinType = mirror.argType
-                val valueProperty = "$storagePointed.value"
-                getter = valueProperty
-                setter = if (global.isConst) null else "$valueProperty = value"
             } else {
+                val pointedTypeName = mirror.pointedType.render(kotlinScope)
+                val storagePointed = "interpretPointed<$pointedTypeName>($getAddressExpression)"
                 kotlinType = mirror.pointedType
                 getter = storagePointed
                 setter = null

backend.native/tests/build.gradle

@@ -2324,7 +2324,9 @@ if (isMac()) {
     task interop_objc_smoke(type: RunInteropKonanTest) {
         disabled = (project.testTarget == 'wasm32') // No interop for wasm yet.
         goldValue = "84\nFoo\nHello, World!\nKotlin says: Hello, everybody!\nHello from Kotlin\n2, 1\n" +
-                "true\ntrue\nDeallocated\nDeallocated\n"
+                "true\ntrue\n" +
+                "Global string\nAnother global string\nnull\nglobal object\n" +
+                "Deallocated\nDeallocated\n"
 
         source = "interop/objc/smoke.kt"
         interop = 'objcSmoke'

backend.native/tests/interop/objc/smoke.h

@@ -52,3 +52,6 @@ void invoke2(void (^block)(void)) {
 
 int (^getSupplier(int x))(void);
 Class (^ _Nonnull getClassGetter(NSObject* obj))(void);
+
+extern NSString* globalString;
+extern NSObject* globalObject;

backend.native/tests/interop/objc/smoke.kt

@@ -48,6 +48,18 @@ fun run() {
         // toString (virtually):
         println(map.keys.map { it.toString() }.min() == foo.description())
     }
+
+    println(globalString)
+    autoreleasepool {
+        globalString = "Another global string"
+    }
+    println(globalString)
+
+    println(globalObject)
+    globalObject = object : NSObject() {
+        override fun description() = "global object"
+    }
+    println(globalObject)
 }
 
 fun MutablePairProtocol.swap() {

backend.native/tests/interop/objc/smoke.m

@@ -57,3 +57,6 @@ int (^getSupplier(int x))(void) {
 Class (^ _Nonnull getClassGetter(NSObject* obj))() {
     return ^{ return obj.class; };
 }
+
+NSString* globalString = @"Global string";
+NSObject* globalObject = nil;