Support ObjC blocks in the new MM

kotlin-native/backend.native/tests/build.gradle

@@ -4759,7 +4759,7 @@ Task frameworkTest(String name, Closure<FrameworkTest> configurator) {
 
 if (isAppleTarget(project)) {
     frameworkTest('testObjCExport') {
-        enabled = !isExperimentalMM // Experimental MM doesn't support ObjC blocks and thread state switching for ObjC interop yet.
+        enabled = !isExperimentalMM // Experimental MM does not support Obj-C weaks and thread state switching for ObjC interop yet.
         final String frameworkName = 'Kt'
         final String dir = "$testOutputFramework/testObjCExport"
         final File lazyHeader = file("$dir/$target-lazy.h")
@@ -4808,7 +4808,7 @@ if (isAppleTarget(project)) {
     }
 
     frameworkTest('testObjCExportNoGenerics') {
-        enabled = !isExperimentalMM // Experimental MM doesn't support ObjC blocks and thread state switching for ObjC interop yet.
+        enabled = !isExperimentalMM // Experimental MM does not support Obj-C weaks and thread state switching for ObjC interop yet.
         final String frameworkName = 'KtNoGenerics'
         final String frameworkArtifactName = 'Kt'
         final String dir = "$testOutputFramework/testObjCExportNoGenerics"
@@ -4861,7 +4861,7 @@ if (isAppleTarget(project)) {
     }
 
     frameworkTest('testObjCExportStatic') {
-        enabled = !isExperimentalMM // Experimental MM doesn't support ObjC blocks and thread state switching for ObjC interop yet.
+        enabled = !isExperimentalMM // Experimental MM does not support Obj-C weaks and thread state switching for ObjC interop yet.
         final String frameworkName = 'KtStatic'
         final String frameworkArtifactName = 'Kt'
         final String libraryName = frameworkName + "Library"

kotlin-native/runtime/src/mm/cpp/Memory.cpp

@@ -444,6 +444,12 @@ extern "C" void EnsureNeverFrozen(ObjHeader* obj) {
     }
 }
 
+extern "C" ForeignRefContext InitLocalForeignRef(ObjHeader* object) {
+    // TODO: Remove when legacy MM is gone.
+    // Nothing to do.
+    return nullptr;
+}
+
 extern "C" ForeignRefContext InitForeignRef(ObjHeader* object) {
     auto* threadData = mm::ThreadRegistry::Instance().CurrentThreadData();
     auto* node = mm::StableRefRegistry::Instance().RegisterStableRef(threadData, object);
@@ -451,6 +457,7 @@ extern "C" ForeignRefContext InitForeignRef(ObjHeader* object) {
 }
 
 extern "C" void DeinitForeignRef(ObjHeader* object, ForeignRefContext context) {
+    RuntimeAssert(context != nullptr, "DeinitForeignRef must not be called for InitLocalForeignRef");
     auto* threadData = mm::ThreadRegistry::Instance().CurrentThreadData();
     auto* node = FromForeignRefManager(context);
     RuntimeAssert(object == **node, "Must correspond to the same object");

kotlin-native/runtime/src/mm/cpp/Stubs.cpp

@@ -21,8 +21,4 @@ RUNTIME_NOTHROW void ReleaseHeapRefNoCollect(const ObjHeader* object) {
     TODO();
 }
 
-ForeignRefContext InitLocalForeignRef(ObjHeader* object) {
-    TODO();
-}
-
 } // extern "C"