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#! -*- coding:utf8 -*-
# Author: L******
# StudentNumber: 514*******
# Class: F14*****
# Time: 2014/10/25 21:30:23
# Prog: Simple translator of assembly language designed
from sys import argv
def tran(filename,targetname):
global var
global lab
global base,entry
global legalop
legalop={"lm":"1","lb":"2","j":"B","and":"8","or":"7","xor":"9","rot":"A","halt":"C","addc":"5","addf":"6","mov":""}
var,lab={},{}
base,entry=0,0
def legalreg(w):
return 0<=w<8
def legalmem(w):
return 0<=w<256
def delcomment(s):
if s.find(";")!=-1:
return s[:s.find(";")]
return s
def genelegal(s):
for c in s:
if not ("0"<=c<="9") and not ("a"<=c<="z") and not ("A"<=c<="Z") and not (c=='_'):
raise ValueError("'{0}' is illegal".format(s))
if s=="":
return False
return True
def getlabel(s):
if s.find(":")!=-1:
w=delprespace(s[:s.find(":")])
for c in w:
if not ("0"<=c<="9") and not ("a"<=c<="z") and not ("A"<=c<="Z"):
raise ValueError("in '{0}' , Label is illegal".format(w))
return w
return ""
def delprespace(s):
for i in range(len(s)):
if s[i]!=" ":
return s[i:]
return ""
def delpostspace(s):
for i in range(len(s)-1,-1,-1):
if s[i]!=" ":
return s[:i+1]
return ""
def deledgespace(s):
ss=delprespace(delpostspace(s))
return ss
def part(s):
s2=delprespace(s)
if s2.find(" ")==-1:
return s2
else:
return(s2[:s2.find(" ")])
def nextpart(s):
if s.find(" ")==-1:
return ""
else:
return part(s[s.find(" "):])
def getbody(s):
if s.find(":")==-1:
return s
else:
return(delprespace(s[s.find(":")+1:]))
def check(para,num,*typ):
global var,lab
if len(para)!=num:
return False
for i in range(num):
if typ[i]=="reg":
if not legalreg(int(para[i])) or len(para[i])!=1:
return False
elif typ[i]=="val":
if (para[i].lower() not in var) and (not legalmem(int(para[i],16)) or len(para[i])!=2) :
return False
elif typ[i]=="addr":
if (para[i].lower() not in lab) and ( not legalmem(int(para[i],16)) or len(para[i])!=2):
return False
return True
def checkpara(h,para):
checkpara=True
if h in ("lm","lb"):
checkpara=checkpara and check(para,2,"reg","val")
if h=="mov":
checkpara=checkpara and (check(para,2,"reg","val") or check(para,2,"reg","reg"))
if h in ("addc","addf","or","and","xor"):
checkpara=checkpara and ((check(para,3,"reg","reg","reg") or check(para,2,"reg","reg")))
if h=="rot":
checkpara=checkpara and check(para,2,"reg","reg")
if h=="j":
checkpara=checkpara and (check(para,2,"reg","addr") or check(para,1,"addr"))
if h=="halt":
checkpara=checkpara and check(para,0)
def var2num(s):
global var
if s in var:
return var[s]
else:
return int(s,16)
def lab2num(s):
global lab
if s in lab:
return lab[s]
else:
return int(s,16)
def process(ff,h,para):
global legalop
global var
global label
checkpara(h,para)
if h!="mov":
ff.write(legalop[h])
else:
if check(para,2,"reg","val"):
ff.write("3")
else:
ff.write("4")
if h in ("lm","lb"):
ff.write("{0}{1:0>2x}".format(para[0],var2num(para[1])))
if h=="mov":
if check(para,2,"reg","val"):
ff.write("{0}{1:0>2x}".format(para[0],var2num(para[1])))
else:
ff.write("{0}{1}".format(para[0],para[1]))
if h in ("addc","addf","or","and","xor"):
if check(para,2,"reg","reg"):
ff.write("{0}{1}{2}".format(para[0],para[0],para[1]))
else:
ff.write("{0}{1}{2}".format(para[0],para[1],para[2]))
if h=="rot":
ff.write("{0}0{1}".format(para[0],para[1]))
if h=="j":
if check(para,1,"addr"):
ff.write("0{0:0>2x}".format(lab2num(para[0])))
else:
ff.write("{0}{1:0>2x}".format(para[0],lab2num(para[1])))
if h=="halt":
ff.write("000")
ff.write("\n")
def scan1():
global var
global lab
global base,entry
f=open(filename,"r")
raw=" ";
datap=False
codep=False
while len(raw):
raw=f.readline()
s=delprespace(delcomment(raw)).replace("\n","")
if s!="":
# print("'"+part(s).lower()+"'")
# print(len(nextpart(s)))
if codep and s!="":
now+=2
if deledgespace(s).lower()==".data":
if datap or codep or len(nextpart(s)):
raise ValueError(".DATA Declaration Error in {0}".format(s))
else:
datap=True
if deledgespace(s).lower()==".code":
if codep or len(nextpart(s)):
raise ValueError(".CODE Declaration Error in {0}".format(s))
else:
codep=True
datap=False
now=0
print("ok")
if part(deledgespace(s).lower())==".entry":
if not codep:
raise ValueError(".ENTRY Declaration Error in {0}".format(s))
else:
entry=int(nextpart(s),16)
if not legalmem(entry):
raise ValueError("illegal Entry {0} in {1}".format(entry,s))
if part(deledgespace(s).lower())==".base":
if not codep or base or now!=2:
raise ValueError(".BASE Declaration Error in {0}".format(s))
else:
base=int(nextpart(s),16)
entry=base
if not legalmem(base):
raise ValueError("illegal base {0} in {1}".format(base,s))
now=base-2
if datap and deledgespace(s).lower()!=".data":
if s.find(" ")==-1:
return ValueError("Illegal data declaration in {}".format(s))
first=part(s)
if first in var or not genelegal(first) or first.isdigit():
raise ValueError("{0} is declared twice or illegal in {1}".format(first,s))
second=int(nextpart(s),16)
if not legalmem(second):
raise ValueError("Illegal address {0} in {1}".format(second,s))
else:
var[first.lower()]=second
if codep and deledgespace(s).lower()!=".code" and deledgespace(s).lower()!=".entry" and deledgespace(s).lower()!=".base" and deledgespace(s).lower()!=".code":
# print(":::",s)
if genelegal(getlabel(s).lower()):
lab[getlabel(s).lower()]=now
f.close()
def scan2():
global var
global lab
global base,entry
global legalop
f=open(filename,"r")
raw=" ";
ff=open(targetname,"w")
codep=False
while len(raw):
raw=f.readline()
s=delprespace(delcomment(raw)).replace("\n","")
if s!="":
# print("'"+part(s).lower()+"'")
# print(len(nextpart(s)))
if codep and s!="":
now+=2
if part(s).lower()==".code":
if codep or len(nextpart(s)):
raise ValueError(".CODE Declaration Error in {0}".format(s))
else:
codep=True
datap=False
now=0
print("ok")
if part(s).lower()==".base":
# if not codep or base or now!=2:
# raise ValueError(".BASE Declaration Error in {0}".format(s))
# else:
# base=int(nextpart(s))
# if not legalmem(base):
# raise ValueError("illegal base {0} in {1}".format(base,s))
now=base-2
if codep and part(s).lower()!=".code" and part(s).lower()!=".base" and part(s).lower()!=".entry":
ss=getbody(s)
h=part(ss).lower()
if h not in legalop:
raise ValueError("Illegal operator {0} in {1}".format(part(ss),s))
print("{0:<3x}".format(now),"|",ss)
para=ss[ss.find(" ")+1:].split(",")
for i in range(len(para)):
para[i]=deledgespace(para[i]).lower()
process(ff,h,para)
ff.close()
f.close()
scan1()
print(lab)
print(base)
scan2()
def main():
helps="Translator from SimpleBasic to machine language\n\
Version 0.1 2014/10/25 L** *****\n\
---------------------------------------------------\n\
Usage:\n\
translator inputfile outputfile"
print(argv)
if len(argv)==1:
print(helps)
if len(argv)!=3:
print("there must be two parameters!")
s1=input("请输入源汇编文件文件：")
s2=input("请输入输出机器语言文件地址：")
tran(s1,s2)
else:
tran(argv[1],argv[2])
if __name__=="__main__":
main()