public static RubyClass createPointerClass(Ruby runtime, RubyModule module) {
RubyClass pointerClass =
module.defineClassUnder(
"Pointer",
module.getClass(AbstractMemory.ABSTRACT_MEMORY_RUBY_CLASS),
RubyInstanceConfig.REIFY_RUBY_CLASSES
? new ReifyingAllocator(Pointer.class)
: PointerAllocator.INSTANCE);
pointerClass.defineAnnotatedMethods(Pointer.class);
pointerClass.defineAnnotatedConstants(Pointer.class);
pointerClass.setReifiedClass(Pointer.class);
pointerClass.kindOf =
new RubyModule.KindOf() {
@Override
public boolean isKindOf(IRubyObject obj, RubyModule type) {
return obj instanceof Pointer && super.isKindOf(obj, type);
}
};
module.defineClassUnder(
"NullPointerError", runtime.getRuntimeError(), runtime.getRuntimeError().getAllocator());
// Add Pointer::NULL as a constant
Pointer nullPointer = new Pointer(runtime, pointerClass, new NullMemoryIO(runtime));
pointerClass.setConstant("NULL", nullPointer);
runtime
.getNilClass()
.addMethod("to_ptr", new NilToPointerMethod(runtime.getNilClass(), nullPointer));
return pointerClass;
}