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assembler.py
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161 lines (150 loc) · 7.42 KB
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import sys
code = open('input.txt', 'r').readlines()
out_symbol_table = open('out_symbol_table.txt', 'w')
out_symbol_table_HEXA = open('out_symbol_table_HEXA.txt', 'w')
out_symbol_table_BIN = open('out_symbol_table_BIN.txt', 'w')
out_symbol_table_total = open('out_symbol_table_total.txt', 'w')
out_symbol_table_total.write("Symbol | HEX | BIN"+'\n'+'-------------------------'+'\n')
output = open('output.txt', 'w')
LC = 0
n = 0
letters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ',']
hexa_letters = ['41', '42', '43', '44', '45', '46', '47', '48', '49', '4A', '4B', '4C', '4D', '4E', '4F', '50',
'51', '52', '53', '54', '55', '56', '57', '58', '59', '5A', '2C']
MRI = ['AND', 'ADD', 'LDA', 'STA', 'BUN', 'BSA', 'ISZ']
MRI_opcode_i = ['0', '1', '2', '3', '4', '5', '6']
MRI_opcode_I = ['8', '9', 'A', 'B', 'C', 'D', 'E']
NON_MRI = ['CLA', 'CLE', 'CMA', 'CME', 'CIR', 'CIL', 'INC', 'SPA', 'SNA', 'SZA', 'SZE', 'HLT', 'INP', 'OUT', 'SKI',
'SKO', 'ION', 'IOF']
NON_MRI_opcode = ['7800', '7400', '7200', '7100', '7080', '7040', '7020', '7010', '7008', '7004', '7002', '7001',
'F800', 'F400', 'F200', 'F100', 'F080', 'F040']
def second_pass():
for line in code:
word = line.split()
if 'ORG' in line:
LC = int(line[4:]) - 1
elif 'END' in line:
print("second pass finished successfully, go ahead and open 'output.txt' to find the final output")
output.write("("+LC+") "+line)
elif line[:3] in MRI:
# getting the address
LC = int(LC)
LC +=1
LC = str(LC)
HEX2BIN = bin(int(LC, 16)).split('b')[-1]
if len(HEX2BIN) < 12:
HEX2BIN = ''.join(('000', HEX2BIN))
HEX2BIN = " ".join(HEX2BIN[i:i + 4] for i in range(0, len(HEX2BIN), 4))
# check if direct or indirect and getting the opcode
if '[' in line:
opcodeIndirect = MRI_opcode_I[MRI.index(line[:3])]
HEX2BIN2 = bin(int(opcodeIndirect, 16)).split('b')[-1]
output.write(line+"(" + LC + ") "+HEX2BIN2+' '+HEX2BIN+'\n')
else:
opcodeDirect = MRI_opcode_i[MRI.index(line[:3])]
HEX2BIN2 = bin(int(opcodeDirect, 16)).split('b')[-1]
if len(HEX2BIN2) == 1:
HEX2BIN2 = ''.join(('000', HEX2BIN2))
elif len(HEX2BIN2) == 2:
HEX2BIN2 = ''.join(('00', HEX2BIN2))
elif len(HEX2BIN2) == 3:
HEX2BIN2 = ''.join(('0', HEX2BIN2))
output.write(line+"("+LC+") "+HEX2BIN2+' '+HEX2BIN+'\n')
elif line[:3] in NON_MRI:
# getting the address
LC = int(LC)
LC += 1
LC = str(LC)
HEX2BIN = bin(int(LC, 16)).split('b')[-1]
if len(HEX2BIN) < 12:
HEX2BIN = ''.join(('000', HEX2BIN))
HEX2BIN = " ".join(HEX2BIN[i:i + 4] for i in range(0, len(HEX2BIN), 4))
opcodeNON_MRI = NON_MRI_opcode[NON_MRI.index(line[:3])]
HEX2BIN2 = bin(int(opcodeNON_MRI, 16)).split('b')[-1]
if len(HEX2BIN2) == 15:
HEX2BIN2 = ''.join((HEX2BIN2, '0'))
HEX2BIN2 = " ".join(HEX2BIN2[i:i + 4] for i in range(0, len(HEX2BIN2), 4))
output.write(line+"("+LC+") "+HEX2BIN2+'\n')
elif ',' in line:
# getting the address
LC = int(LC)
LC += 1
LC = str(LC)
HEX2BIN = bin(int(LC, 16)).split('b')[-1]
if len(HEX2BIN) < 12:
HEX2BIN = ''.join(('000', HEX2BIN))
HEX2BIN = " ".join(HEX2BIN[i:i + 4] for i in range(0, len(HEX2BIN), 4))
output.write(line+"("+LC+") "+HEX2BIN+'\n')
else:
print("Error: check your syntax")
sys.exit(True)
for line in code:
word = line.split()
for i in word:
# scanning for Label
if ',' in i:
out_symbol_table.write(i[0:2]+'\n'+i[2:4]+'\n')
for letter in list(i):
# get each letter in the list
if letter in letters:
# check the letter existence and convert it to binary
index = letters.index(letter)
HEXA2BIN = bin(int(hexa_letters[index], 16))
HEXA2BIN = HEXA2BIN.replace('b', '')
HEXA2BIN = " ".join(HEXA2BIN[i:i+4] for i in range(0, len(HEXA2BIN), 4))
HEXA2BIN = HEXA2BIN.split(' ')
if len(HEXA2BIN[0]) == 3:
HEXA2BIN[0] = ''.join(('0', HEXA2BIN[0]))
elif len(HEXA2BIN[1]) == 3:
HEXA2BIN[0] = ''.join(('0', HEXA2BIN[0]))
else: pass
# write output to files
out_symbol_table_HEXA.write(hexa_letters[index]+'\n')
out_symbol_table_BIN.write(HEXA2BIN[0] + HEXA2BIN[1] + '\n')
n += 1
# Increment LC and save it in the HEX table and BIN table
if n == 4:
LC += 1
LC = str(LC)
if len(LC) == 3:
LC = ''.join(('0', LC))
else: pass
HEX2BIN = bin(int(LC, 16)).split('b')[-1]
if len(HEX2BIN) < 16:
HEX2BIN = ''.join(('0000000', HEX2BIN))
HEX2BIN = " ".join(HEX2BIN[i:i + 8] for i in range(0, len(HEX2BIN), 8))
HEX2BIN = HEX2BIN.split(' ')
out_symbol_table_BIN.write(HEX2BIN[0] + '\n'+HEX2BIN[1] + '\n')
LC = " ".join(LC[i:i + 2] for i in range(0, len(LC), 2))
LC = LC.split(' ')
DEC2HEXA = hex(int(LC[0])).split('x')[-1]
if len(DEC2HEXA) == 1:
DEC2HEXA = ''.join(('0', DEC2HEXA))
else: pass
out_symbol_table_HEXA.write(DEC2HEXA + '\n')
DEC2HEXA = hex(int(LC[1])).split('x')[-1]
if len(DEC2HEXA) == 1:
DEC2HEXA = ''.join(('0', DEC2HEXA))
else:
pass
LC = "".join(LC)
out_symbol_table_HEXA.write(DEC2HEXA + '\n')
out_symbol_table_total.write(" (LC) " + LC + '\n')
LC = int(LC)
n = 0
out_symbol_table_total.write(' '+letter+' '+hexa_letters[index]+' '+
HEXA2BIN[0]+HEXA2BIN[1]+'\n')
else:
print("Error: check your syntax")
sys.exit(True)
# scanning for ORG
if 'ORG' in line:
LC = int(line[4:]) - 1
elif 'END' in line:
print("The first pass finished successfully, go ahead and open 'out_symbol_table_total.txt' to find the "
"results of the first pass")
second_pass()
# scanning for instructions to set LC
elif "," not in line:
LC += 1