@TruffleBoundary
protected CallTarget findCallTarget(TruffleObject truffleObject) {
final ForeignAccess fa = truffleObject.getForeignAccess();
final CallTarget ct = fa.access(access);
if (ct == null) {
throw messageNotRecognizedException(fa);
}
return ct;
}
@Override
public Object execute(VirtualFrame frame) {
if (RubyGuards.isRubyString(ForeignAccess.getReceiver(frame))) {
final DynamicObject string = (DynamicObject) ForeignAccess.getReceiver(frame);
final int index = (int) ForeignAccess.getArguments(frame).get(labelIndex);
if (index >= Layouts.STRING.getRope(string).byteLength()) {
return 0;
} else {
return (byte) StringOperations.getByteListReadOnly(string).get(index);
}
} else {
CompilerDirectives.transferToInterpreter();
throw new IllegalStateException("Not implemented");
}
}