def base_10_to_b3(base_10, length):
""" base_10_to_b3:
base_10: integer value
length: desired length of resulting string
convert from base 10 to base -3 w/base_converter.base_convert
and fill in leading zeros
return: balanced base 3 string with length of 'length'
"""
result = base_converter.base_convert(str(base_10), 10, -3)
if len(result) != length:
add = length - len(result)
for i in range(0, add):
result = '0' + result
return result
def decode_code(self, s):
""" Decode Assembled Code:
R-Type:
--------------------------------------------------------
| type(2) | opcode(13) | rs(3) | rt(3) | rd(3) | sa(3) |
--------------------------------------------------------
I-Type:
--------------------------------------------------------
| type(2) | opcode(5) | rs(3) | rt(3) | immediate(14) |
--------------------------------------------------------
B-Type:
--------------------------------------------------------
| type(2) | opcode(4) | rs(3) | label0(9) | label(9) |
--------------------------------------------------------
J-Type:
--------------------------------------------------------
| type(2) | opcode(4) | address(21) |
--------------------------------------------------------
"""
type = int(base_converter.base_convert(s[0:2], -3, 10))
# R-Type
if type == R_TYPE:
self.alu_op = int(base_converter.base_convert(s[2:15], -3, 10))
self.src1 = int(base_converter.base_convert(s[15:18], -3, 10))
self.src2 = int(base_converter.base_convert(s[18:21], -3, 10))
self.dest = int(base_converter.base_convert(s[21:24], -3, 10))
self.imdt1 = int(base_converter.base_convert(s[24:27], -3, 10))
self.imdt2 = 0
# I-Type
elif type == R_TYPE:
self.alu_op = int(base_converter.base_convert(s[2:7], -3, 10))
self.src1 = int(base_converter.base_convert(s[7:10], -3, 10))
self.dest = int(base_converter.base_convert(s[10:13], -3, 10))
self.imdt1 = int(base_converter.base_convert(s[13:27], -3, 10))
self.src2 = 0
self.imdt2 = 0
# B-Type
elif type == R_TYPE:
self.alu_op = int(base_converter.base_convert(s[2:6], -3, 10))
self.src1 = int(base_converter.base_convert(s[6:9], -3, 10))
self.imdt1 = int(base_converter.base_convert(s[9:18], -3, 10))
self.imdt2 = int(base_converter.base_convert(s[18:27], -3, 10))
self.src2 = 0
self.dest = 0
# J-Type
elif type == R_TYPE:
self.alu_op = int(base_converter.base_convert(s[2:6], -3, 10))
self.imdt1 = int(base_converter.base_convert(s[6:27], -3, 10))
self.src1 = 0
self.src2 = 0
self.dest = 0
self.imdt2 = 0
# Uknown type
else:
raise DecodeError("invalid type code = %s" % (type, ))
