44 def get_optional_null(perf_dict, field):  argument
45 	if field in perf_dict:
46 		return perf_dict[field]
49 def get_optional_zero(perf_dict, field):  argument
50 	if field in perf_dict:
51 		return perf_dict[field]
54 def get_optional_bytes(perf_dict, field):  argument
55 	if field in perf_dict:
56 		return perf_dict[field]
59 def get_optional(perf_dict, field):  argument
60 	if field in perf_dict:
61 		return perf_dict[field]
64 def get_offset(perf_dict, field):  argument
65 	if field in perf_dict:
66 		return "+%#x" % perf_dict[field]