def parse_operand(string, location, tokens):
"""Parse instruction operand.
"""
sizes = {
"dqword": 128,
"pointer": 72,
"qword": 64,
"pointer": 40,
"dword": 32,
"word": 16,
"byte": 8,
"bit": 1,
}
if "immediate" in tokens:
imm_str = "".join(tokens["immediate"])
base = 16 if imm_str.startswith("0x") or imm_str.startswith(
"-0x") else 10
immediate = int(imm_str, base)
oprnd = ReilImmediateOperand(immediate)
if "register" in tokens:
if tokens["register"] in ["e", "empty"]:
oprnd = ReilEmptyOperand()
oprnd.size = 0
else:
name = tokens["register"]
oprnd = ReilRegisterOperand(name)
if "size" in tokens:
size = int(sizes[tokens["size"]])
oprnd.size = size
return [oprnd]
