case RETURN:
if (insn.getArgsCount() > 0 && insn.getArg(0).isLiteral()) {
LiteralArg arg = (LiteralArg) insn.getArg(0);
FieldNode f = parentClass.getConstFieldByLiteralArg(arg);
if (f != null) {
arg.wrapInstruction(new IndexInsnNode(InsnType.SGET, f.getFieldInfo(), 0));
}
}
break;
default: