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assembler_directives.py
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assembler_directives.py
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from common_backend import *
#use memory and data_ptr
#.byte, .half, .word, .dword, .asciiz
#
class UnknownAD(Exception):#unknown assembler directive
pass
class BigData(Exception):
pass
dict = {}
ptr = 0x10000000
def asembler_directives():
global ptr
ptr = 0x10000000
global dict
dict.clear
asmdirinp = open("input.txt", "r")
inplist = asmdirinp.readlines()
for lien in inplist:#lien is line
if (lien[-1] == '\n'):
lien = lien[:-1]
if ('.' in lien):
while (':' in lien):
lien = lien[1:]
lien = lien.replace(" ", ",")
lien_list = lien.split(',')
while ("" in lien_list):
lien_list.remove("")
if (lien_list[0] != '.data' and lien_list[0] != '.text'):
if (lien_list[0] == '.byte'):
lien_list.remove(lien_list[0])
data_list = lien_list
for data in data_list:
if (int(data) < 0):
data = int(data)
data = data + pow(2, 8)
if (data < pow(2, 7)):#128
raise BigData("data too big to fit")
data = str(data)
elif (int(data) >= pow(2, 7)):#128
raise BigData("data too big to fit")
dict[ptr] = int(data)
ptr = ptr + 1
elif (lien_list[0] == '.asciiz'):
lien_list.remove(lien_list[0])
data_list = lien_list
for data in data_list:
for ch in data[1:-1]:
dict[ptr] = ord(ch)
ptr = ptr + 1
elif (lien_list[0] == '.half'):
lien_list.remove(lien_list[0])
data_list = lien_list
for data in data_list:
if (int(data) < 0):
data = int(data)
data = data + pow(2, 16)
if (data < pow(2, 15)):
raise BigData("data too big to fit")
data = str(data)
elif (int(data) >= pow(2, 15)):
raise BigData("data too big to fit")
dict[ptr] = int(data) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x100) % 0x100
#dict[ptr] = int(int(data) % 0xffff) /
ptr = ptr + 1
elif (lien_list[0] == '.word'):
lien_list.remove(lien_list[0])
data_list = lien_list
for data in data_list:
if (int(data) < 0):
data = int(data)
data = data + pow(2, 32)
if (data < pow(2, 31)):
raise BigData("data too big to fit")
data = str(data)
elif (int(data) >= pow(2, 31)):
raise BigData("data too big to fit")
dict[ptr] = int(data) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x100) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x10000) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x1000000) % 0x100
ptr = ptr + 1
elif (lien_list[0] == '.dword'):
lien_list.remove(lien_list[0])
data_list = lien_list
for data in data_list:
if (int(data) < 0):
data = int(data)
data = data + pow(2, 64)
if (data < pow(2, 63)):
raise BigData("data too big to fit")
data = str(data)
elif (int(data) >= pow(2, 63)):
raise BigData("data too big to fit")
dict[ptr] = int(data) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x100) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x10000) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x1000000) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x100000000) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x10000000000) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x1000000000000) % 0x100
ptr = ptr + 1
dict[ptr] = int(int(data) / 0x100000000000000) % 0x100
ptr = ptr + 1
else:
raise UnknownAD("unknown assembler directive")
#unrecognised assembler directive
return dict
asmdirinp.close()
#asembler_directives()