call a native function pointer from java?

Is it possible to call a function pointer from Java?

To call a C function from Java I can just use the down call method from the CLinker, but that works only for functions and not for function pointers, since it needs a NativeSymbol for the function.

So how can I get a NativeSymbol from a MemoryAddress? Or is there an other possibility to call a function pointer from java code.

My current workaround is to just use C wrapper functions, like this:

void call_function(void (*func)(void)) {
    func();
}

and then just call these functions

    CLinker link = CLinker.systemCLinker();
    MethodHandle handle = link.downcallHandle(link.lookup("get_function_pointer").orElseThrow(), FunctionDescriptor.of(ADDRESS);
    MemoryAddress funcPntr = (MemoryAddress) handle.invoke();
    handle = link.downcallHandle(link.lookup("call_function").orElseThrow(), FunctionDescriptor.of(ADDRESS);
    handle.invoke();

Like Johannes Kuhn commented: NativeSymbol.ofAddress is exactly what I need.

So the code looks like this:

CLinker link = CLinker.systemCLinker();
MethodHandle handle = link.downcallHandle(link.lookup("get_function_pointer").orElseThrow(), FunctionDescriptor.of(ADDRESS);
MemoryAddress funcPntr = (MemoryAddress) handle.invoke();
try (ResourceScope scope = ResourceScope.newConfinedScope()) {
    NativeSymbol funcSymbol = NativeSymbol.ofAddress("symbol_name", funcPntr, scope);
    MethodHandle handle = linker.downcallHandle(funcPntr, FunctionDescriptor.ofVoid());
    handle.invoke();
}