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SimpleAssembler.py
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SimpleAssembler.py
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import sys
'''
Group A7
Assembler
'''
c = 0
labels = {}
vars={}
L = []
lister = []
MC = {"R0":0,"R1":0,"R2":0,"R3":0,"R4":0,"R5":0,"R6":0}
count = 0
im = 0
opcod = {'add':'10000',
'sub':'10001',
'mov':'10010',#move immediate
'mov_':'10011',#move register
'ld':'10100',
'st':'10101',
'mul':'10110',
'div':'10111',
'rs':'11000',
'ls':'11001',
'xor':'11010',
'or':'11011',
'and':'11100',
'not':'11101',
'cmp':'11110',
'jmp':'11111',
'jlt':'01100',
'jgt':'01101',
'je':'01111',
'hlt':'01010'}
reg_cod = {'R0':'000',
'R1':'001',
'R2':'010',
'R3':'011',
'R4':'100',
'R5':'101',
'R6':'110',
'FLAGS':'111'}
flags = {"V":0,"L":0,"G":0,"E":0}
Type = {
'add':'A',
'sub':'A',
'mov':'B',#immediate
'mov_':'C',#register
'ld':'D',
'st':'D',
'mul':'A',
'div':'C',
'rs':'B',
'ls':'B',
'xor':'A',
'or':'A',
'and':'A',
'not':'C',
'cmp':'C',
'jmp':'E',
'jlt':'E',
'jgt':'E',
'je':'E',
'var' : 'var',
'VAR' : 'VAR',
'hlt':'F',
'.':'.'
}
bs = ""
def outpu(lister):
# print(lister)
o = sys.stdout
for a in lister:
o.write(a + '\n')
sys.exit()
def cbin(n):
global bs
bs = ""
while(n != 0):
r = n % 2
bs = bs + str(r)
n = n // 2
return bs[::-1]
def cbin1(a):
opcstr = ""
bnr = cbin(a)
zs = 8 - len(bnr)
im = zs * '0'
opcstr = opcstr + im
opcstr = opcstr + bnr
return opcstr
def typeA(m):
global lister
opcstr = ""
zs = ""
if(len(m) != 4):
sys.stderr.write("Syntax Error: Invalid syntax for type A instruction")
for i in opcod:
if(m[0] == i):
opcstr = opcstr + opcod[i]
zs = 2 * '0'
opcstr = opcstr + zs
if(MC[m[2]] > (2**16)):
flags["V"] = 1
if(m[1] == "FLAGS" or m[2] == "FLAGS" or m[3] == "FLAGS"):
sys.stderr.write("Error in line : " + str(count) + " Illegal Use of Flags")
return
if(not(0 <= int(m[1][1]) < 7)):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
if(not(0 <= int(m[2][1]) < 7)):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
if(not(0 <= int(m[3][1]) < 7)):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
if(m[1][0] != "R" or m[2][0] != "R" or m[3][0] != "R"):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
else:
for i in range(1,4):
if m[i] in reg_cod.keys():
opcstr+=reg_cod[m[i]]
lister.append(opcstr)
def typeB(m):
global lister
global count
global bs
opcstr = ""
global im
if(len(m) != 3):
sys.stderr.write("Syntax Error: Invalid syntax for type B instruction")
for i in opcod:
if(m[0] == i):
opcstr = opcstr + opcod[i]
for i in reg_cod:
if(m[1] == i and m[1]!= "FLAGS" and 0 <= int(m[1][1]) < 7):
opcstr = opcstr + reg_cod[i]
elif(m[1] == "FLAGS"):
sys.stderr.write("Error in line : " + str(count) + " Illegal Use of Flags")
return
elif(not(0 <= int(m[1][1]) < 7)):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
elif(m[1][0] != "R"):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
# for i in range(1,len(m)):
try:
m[2] = m[2][1:]
im_ = int(m[2])
except ValueError:
m[2] = m[2][1:]
im = cbin(int(m[2]))
l = 8 - len(im)
zs = l * '0'
im = zs + im
opcstr = opcstr + im
if (im_<0 or im_>255):
sys.stderr.write("Error: Immediate value is not correct")
else:
im = cbin(im_)
l = 8 - len(im)
zs = l * '0'
im = zs + im
opcstr = opcstr + im
lister.append(opcstr)
bs = ""
def typeC(m):
global lister
global count
global bs
opcstr = ""
global im
if(len(m) != 3):
sys.stderr.write("Syntax Error: Invalid syntax for type B instruction")
for i in opcod:
if(m[0] == i):
opcstr = opcstr + opcod[i]
zs = 5 * '0'
opcstr = opcstr + zs
if(MC[m[1]] == MC[m[2]]):
pass#to set up the flags register
for i in reg_cod:
if(m[1] == i and m[1]!= "FLAGS" and 0 <= int(m[1][1]) < 7):
opcstr = opcstr + reg_cod[i]
if(m[2] == i and m[2]!= "FLAGS" and 0 <= int(m[2][1]) < 7):
opcstr = opcstr + reg_cod[i]
elif(m[1] == "FLAGS"):
sys.stderr.write("Error in line : " + str(count) + " Illegal Use of Flags")
return
elif(not(0 <= int(m[1][1]) < 7)):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
elif(m[1][0] != "R"):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
lister.append(opcstr)
bs = ""
def typeD(m,L):
global vars
global count
global c
global lister
# global L
opcstr = ""
if(len(m) != 3):
sys.stderr.write("Syntax Error: Invalid syntax for type D instruction")
# c=0
# i=0
# while(L[i][0]=="var" and i<=len(L)-1):
# c+=1
# i+=1
for i in range(len(L)):
if(L[i][0] == "var"):
c = c + 1
x = c
for i in range(c):
if (L[i][0]=="var" and len(vars) == 0):
# print((len(L)-x)+i)
vars[L[i][1]]=cbin1((len(L)-x)+i)
elif (L[i][0]=="var" and len(vars) != 0):
vars.clear()
a = 0
for i in range(len(L)):
if(L[i][0] == "var"):
a = a + 1
for i in range(a):
vars[L[i][1]]=cbin1((len(L)-a)+i)
# for i in vars:
# print(i, vars[i])
# for i in range(len(L)):
# if (L[i][0]) != "var":
# c = c + 1
# x = c
# for i in range(len(L)):
# if(L[i][0] == "var"):
# # vars[L[i][1]] = 0
# # x = ((len(L)-x)+i)
# vars[L[i][1]] = cbin1(x)
# x = x + 1
if m[0]==("st"):
try:
opcstr = opcstr + opcod[m[0]]
opcstr = opcstr + reg_cod[m[1]]
opcstr = opcstr + vars[m[2]]
lister.append(opcstr)
except KeyError:
sys.stderr.write("The variable has not been declared.")
if m[0]==("ld"):
try:
opcstr = opcstr + opcod[m[0]]
opcstr = opcstr + reg_cod[m[1]]
opcstr = opcstr + vars[m[2]]
lister.append(opcstr)
except KeyError:
sys.stderr.write("The variable has not been declared.")
elif(m[1] == "FLAGS"):
sys.stderr.write("Error in line : " + str(count) + " Illegal Use of Flags")
return
elif(not(0 <= int(m[1][1]) < 7)):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
elif(m[1][0] != "R"):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
def typeE(m,L):
global labels
global lister
opcstr = ""
zs = ""
if(len(m) != 2):
sys.stderr.write("Syntax Error: Invalid syntax for type E instruction")
for i in opcod:
if(m[0] == i):
opcstr = opcstr + opcod[i]
zs = 3 * '0'
opcstr = opcstr + zs
# try:
# opcstr = opcstr + str(m[1])
# except IndexError:
# opcstr = opcstr + m[1]
for i in range(len(L)):
if(L[i][0] == "jmp" or L[i][0] == "jlt" or L[i][0] == "jgt" or L[i][0] == "je"):
if (L[i][1]) in labels:
opcstr = opcstr + labels[L[i][1]]
else:
sys.stderr.write("Error: label not found")
lister.append(opcstr)
if(m[0] == "jlt"):
flags['L'] = 1
if(m[0] == "jgt"):
flags['G'] = 1
if(m[0] == "je"):
flags['E'] = 1
def typeF(m):
global lister
global count
opcstr = ""
if(len(m) != 1):
sys.stderr.write("Syntax Error: Invalid syntax for type F instruction")
for i in opcod:
if(m[0] == i):
opcstr = opcstr + opcod[i]
zs = 11 * '0'
opcstr = opcstr + zs
lister.append(opcstr)
outpu(lister)
def typeld(m,L):
global c
global count
global vars
global lister
# global L
opcstr = ""
if(len(m) != 3):
sys.stderr.write("Syntax Error: Invalid syntax for type D instruction")
# i=0
# while(L[i][0]=="var" and i<=len(L)-1):
# c+=1
# i+=1
# for i in range(len(L)):
# if(L[i][0] == "var"):
# c = c + 1
# for i in range(c):
# if L[i][0]=="var":
# vars[L[i][1]]=cbin1((len(L)-c)+i)
for i in range(len(L)):
if(L[i][0] == "var"):
c = c + 1
x = c
for i in range(c):
if (L[i][0]=="var" and len(vars) == 0):
# print((len(L)-x)+i)
vars[L[i][1]]=cbin1((len(L)-x)+i)
elif (L[i][0]=="var" and len(vars) != 0):
vars.clear()
a = 0
for i in range(len(L)):
if(L[i][0] == "var"):
a = a + 1
for i in range(a):
vars[L[i][1]]=cbin1((len(L)-a)+i)
# for i in vars:
# print(i, vars[i])
if m[0]==("ld"):
try:
opcstr = opcstr + opcod[m[0]]
opcstr = opcstr + reg_cod[m[1]]
opcstr = opcstr + vars[m[2]]
lister.append(opcstr)
except KeyError:
sys.stderr.write("The variable has not been declared.")
elif(m[1] == "FLAGS"):
sys.stderr.write("Error in line : " + str(count) + " Illegal Use of Flags")
return
elif(not(0 <= int(m[1][1]) < 7)):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
elif(m[1][0] != "R"):
sys.stderr.write("Error in line : " + str(count) + " Not a valid register")
return
def checker(L):
global labels
# print(L)
for i in range(len(L)):
m = L[i]
if(L[i][0] == "mov" and L[i][2][0] == "$"):
typeB(m)
elif(L[i][0] == "mov" and L[i][2][0] == "R"):
k = L[i]
k[0] = "mov_"
typeC(m)
elif(L[i][0] == "mul" and len(m) == 4):
typeA(m)
elif(L[i][0] == "add" and len(m) == 4):
typeA(m)
elif(L[i][0] == "sub" and len(m) == 4):
typeA(m)
elif(L[i][0] == "st" and len(m) == 3):
typeD(m,L)
elif(L[i][0] == "ld" and len(m) == 3):
typeld(m,L)
elif(L[i][0] == "div"):
typeC(m)
elif(L[i][0] == "rs" and L[i][2][0] == "$"):
typeB(m)
elif(L[i][0] == "ls" and L[i][2][0] == "$"):
typeB(m)
elif(L[i][0] == "xor" and len(m) == 4):
typeA(m)
elif(L[i][0] == "or" and len(m) == 4):
typeA(m)
elif(L[i][0] == "and" and len(m) == 4):
typeA(m)
elif(L[i][0] == "not"):
typeC(m)
elif(L[i][0] == "cmp"):
typeC(m)
elif(L[i][0] == "jmp" and len(m) == 2):
typeE(m,L)
elif(L[i][0] == "jlt" and len(m) == 2):
typeE(m,L)
elif(L[i][0] == "jgt" and len(m) == 2):
typeE(m,L)
elif(L[i][0] == "je" and len(m) == 2):
typeE(m,L)
elif(L[i][0] == "hlt"):
typeF(m)
if(L[i].count(L[i][0]) > 1):
# print(L[i].count(L[i][0]))
sys.stderr.write("Error!! Label can be entered only once")
quit()
if(L[i][0][-1] == ":"):
Type[L[i][0]] = L[i][0]
else:
if(m[0] not in Type):
sys.stderr.write("Please enter valid input")
# print(Type)
quit()
def main():
global labels
global count
s = "new"
L = []
while(s!='hlt'):
s = sys.stdin.readline()
count = count + 1
m = s.split()
if(m[0] != "hlt"):
print(m[0])
L.append(m)
# print(m)
# print(L)
for line in m:
if (line[-1] == ":"):#identifying labels
labels[line[0:-1]] = cbin1(count)#storing the label with their line number
print(cbin1(count))
m.pop(0)
if(L[0][0] == "hlt" and count == 1):
sys.stderr.write("Error in line : " + str(count) + " Halt Instruction can't be used in the beginning")
typeF(m)
else:
if(L[0][0] != "var"):
for i in range(1,len(L)):
if L[i][0]=="var":
sys.stderr.write("Error in line : " + str(count) + " Variable is not declared at the beginning")
quit()
else:
for i in range(15):
if (" "*i) in m:
m.remove(" "*i)
else:
L.append(m)
# if(m[0] == "label")
checker(L)
break
# for i in range(0,len(L)):
# if(L[i][0] == "mov" and L[i][2][0] == "$"):
# typeB(m)
# elif(L[i][0] == "mov" and L[i][2][0] == "R"):
# k = L[i]
# k[0] = "mov_"
# typeC(m)
# elif(L[i][0] == "mul" and len(m) == 4):
# typeA(m)
# elif(L[i][0] == "add" and len(m) == 4):
# typeA(m)
# elif(L[i][0] == "sub" and len(m) == 4):
# typeA(m)
# elif(L[i][0] == "st" and len(m) == 3):
# typeD(m,L)
# elif(L[i][0] == "ld" and len(m) == 3):
# typeD(m,L)
# elif(L[i][0] == "div"):
# typeC(m)
# elif(L[i][0] == "rs" and L[i][2][0] == "$"):
# typeB(m)
# elif(L[i][0] == "ls" and L[i][2][0] == "$"):
# typeB(m)
# elif(L[i][0] == "xor" and len(m) == 4):
# typeA(m)
# elif(L[i][0] == "or" and len(m) == 4):
# typeA(m)
# elif(L[i][0] == "and" and len(m) == 4):
# typeA(m)
# elif(L[i][0] == "not"):
# typeC(m)
# elif(L[i][0] == "cmp"):
# typeC(m)
# elif(L[i][0] == "jmp" and len(m) == 2):
# typeE(m,L)
# elif(L[i][0] == "jlt" and len(m) == 2):
# typeE(m,L)
# elif(L[i][0] == "jgt" and len(m) == 2):
# typeE(m,L)
# elif(L[i][0] == "je" and len(m) == 2):
# typeE(m,L)
# elif(L[i][0] == "hlt"):
# typeF(m,L)
# '''elif(i>0 and L[i][0] == "var"):
# sys.stderr.write("Error in line: "+str(count)+" Variables can only be declared in the beginning")
# sys.exit()
# else:
# sys.stderr.write("Error in line: "+str(count)+" Please enter the instructions in valid format")
# sys.exit()'''
main()