50 def get_optional_null(perf_dict, field):  argument
51 	if field in perf_dict:
52 		return perf_dict[field]
55 def get_optional_zero(perf_dict, field):  argument
56 	if field in perf_dict:
57 		return perf_dict[field]
60 def get_optional_bytes(perf_dict, field):  argument
61 	if field in perf_dict:
62 		return perf_dict[field]
65 def get_optional(perf_dict, field):  argument
66 	if field in perf_dict:
67 		return perf_dict[field]
70 def get_offset(perf_dict, field):  argument
71 	if field in perf_dict:
72 		return "+%#x" % perf_dict[field]