Enable unused-function warning for runtime (#4628)

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

@@ -798,7 +798,6 @@ namespace {
 void freeContainer(ContainerHeader* header) NO_INLINE;
 #if USE_GC
 void garbageCollect(MemoryState* state, bool force) NO_INLINE;
-void cyclicGarbageCollect() NO_INLINE;
 void rememberNewContainer(ContainerHeader* container);
 #endif  // USE_GC
 
@@ -1017,10 +1016,6 @@ inline FrameOverlay* asFrameOverlay(ObjHeader** slot) {
   return reinterpret_cast<FrameOverlay*>(slot);
 }
 
-inline bool isRefCounted(KConstRef object) {
-  return isFreeable(containerFor(object));
-}
-
 inline void lock(KInt* spinlock) {
   while (compareAndSwap(spinlock, 0, 1) != 0) {}
 }
@@ -1698,6 +1693,7 @@ void collectWhite(MemoryState* state, ContainerHeader* start) {
 }
 #endif
 
+#if COLLECT_STATISTIC
 inline bool needAtomicAccess(ContainerHeader* container) {
   return container->shareable();
 }
@@ -1707,6 +1703,7 @@ inline bool canBeCyclic(ContainerHeader* container) {
   if (container->color() == CONTAINER_TAG_GC_GREEN) return false;
   return true;
 }
+#endif
 
 inline void addHeapRef(ContainerHeader* container) {
   MEMORY_LOG("AddHeapRef %p: rc=%d\n", container, container->refCount())
@@ -1774,6 +1771,11 @@ inline void releaseHeapRef(const ObjHeader* header) {
     releaseHeapRef<Strict, CanCollect>(const_cast<ContainerHeader*>(container));
 }
 
+
+// TODO: Consider removing this unused stuff.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+
 // We use first slot as place to store frame-local arena container.
 // TODO: create ArenaContainer object on the stack, so that we don't
 // do two allocations per frame (ArenaContainer + actual container).
@@ -1800,6 +1802,8 @@ inline size_t containerSize(const ContainerHeader* container) {
   return result;
 }
 
+#pragma clang diagnostic pop
+
 #if USE_GC
 void incrementStack(MemoryState* state) {
   FrameOverlay* frame = currentFrame;

kotlin-native/runtime/src/main/cpp/Exceptions.cpp

@@ -107,11 +107,13 @@ _Unwind_Reason_Code unwindCallback(
 
 THREAD_LOCAL_VARIABLE bool disallowSourceInfo = false;
 
+#if !OMIT_BACKTRACE && !USE_GCC_UNWIND
 SourceInfo getSourceInfo(KConstRef stackTrace, int index) {
   return disallowSourceInfo
       ? SourceInfo { .fileName = nullptr, .lineNumber = -1, .column = -1 }
       : Kotlin_getSourceInfo(*PrimitiveArrayAddressOfElementAt<KNativePtr>(stackTrace->array(), index));
 }
+#endif
 
 }  // namespace
 

kotlin-native/runtime/src/main/cpp/ObjCExport.mm

@@ -124,7 +124,6 @@ extern "C" OBJ_GETTER(Kotlin_ObjCExport_AllocInstanceWithAssociatedObject,
 }
 
 static Class getOrCreateClass(const TypeInfo* typeInfo);
-static void initializeClass(Class clazz);
 
 extern "C" id objc_retainAutoreleaseReturnValue(id self);
 
@@ -768,16 +767,6 @@ static KStdVector<const TypeInfo*> getProtocolsAsInterfaces(Class clazz) {
   return result;
 }
 
-static const TypeInfo* getMostSpecificKotlinClass(const TypeInfo* typeInfo) {
-  const TypeInfo* result = typeInfo;
-  while (getTypeAdapter(result) == nullptr) {
-    result = result->superType_;
-    RuntimeAssert(result != nullptr, "");
-  }
-
-  return result;
-}
-
 static int getVtableSize(const TypeInfo* typeInfo) {
   for (const TypeInfo* current = typeInfo; current != nullptr; current = current->superType_) {
     auto typeAdapter = getTypeAdapter(current);