operations={"add":"00000","sub":"00001","movimm":"00010","movreg":"00011","ld":"00100","st":"00101","mul":"00110", "div":"00111","rs":"01000","ls":"01001","xor":"01010","or":"01011","and":"01100","not":"01101", "cmp":"01110","jmp":"01111","jlt":"11100","jgt":"11101","je":"11111","hlt":"11010","mov":"0"} registers={"R0":"000","R1":"001","R2":"010","R3":"011","R4":"100","R5":"101","R6":"110","FLAGS":"111"} A=["add","sub","mul","xor","or","and"] B=["movimm","rs","ls"] C=["movreg","div","not","cmp"] D=["ld","st"] E=["jmp","jlt","jgt","je"] F=["hlt"] R0=["0"]*16 R1=["0"]*16 R2=["0"]*16 R3=["0"]*16 R4=["0"]*16 R5=["0"]*16 R6=["0"]*16 FLAGS=["0"]*16 variables={} f=open("textfile.txt") f2=open("outfile.txt","w+") L1=f.readlines() L2=[] labels={} #labels_values variables_list=[] write_list=[] print(L1) if len(L1)>128: f2.write("Instructions exceed memory limit") exit() var_flag=0 for i in range(len(L1)): if L1[i]=="\n": pass else: if ((L1[i]).strip()).split()[0][-1]==":": var_flag=1 labels[((L1[i].strip()).split()[0])[:-1]]=str(format(i,f'0{7}b')) L2.append(((((L1[i]).strip()).split())[1:])) elif (((L1[i]).strip()).split())[0]=="var": if var_flag==0: variables_list.append(((L1[i].strip()).split())[1]) else: f2.write("Variable not declared at start in line number"+str(i)) exit() elif ((L1[i]).strip()).split()[0] in operations: var_flag=1 L2.append((L1[i].strip()).split()) elif ((L1[i]).strip()).split()[0][-1]!=":" or ((L1[i]).strip()).split()[0] not in operations or ((L1[i]).strip()).split()[0]!="var": f2.write("Keyword not recognized") exit() if ["hlt"] not in L2: f2.write("Halt missing") exit() if L2[-1][0]!="hlt": f2.write("Halt must be last instruction") exit() variables_list.append("") for i in range(len(variables_list)): L2.append("") L2[len(L2)-1]=variables_list[i] variables[variables_list[i]]=L2.index(variables_list[i]) L2.pop(len(L2)-1) print(L2) if len(L2)>128: f2.write("Memory limit exceeded") exit() print(labels) for i in range(len(L2)): if L2[i][0] not in operations: f2.write("Typo in operation at line number"+str(i)) exit() if L2[i][0]=="hlt": write_list.append(operations[L2[i][0]]+("0"*11)) break elif L2[i][0]=="jmp": temp=i if L2[i][1] in variables_list: if L2[i][1] not in labels: f2.write("Variable used as label at line number"+str(i)) exit() if L2[i][1] not in list(labels.keys()): f2.write("Undefined label used at line number"+str(i)) exit() num=int(labels[L2[i][1]]) i=num write_list.append(operations[L2[temp][0]]+("0"*4)+labels[L2[temp][1]]) write_list.append("\n") elif L2[i][0]=="jlt": temp=i if L2[i][1] in variables_list: if L2[i][1] not in labels: f2.write("Variable used as label at line number"+str(i)) exit() if L2[i][1] not in list(labels.keys()): f2.write("Undefined label used at line number"+str(i)) exit() if FLAGS[13]=="1": num=int(labels[L2[i][1]]) i=num num_bin_str=str(format(num,f'0{7}b')) write_list.append(operations[L2[temp][0]]+("0"*4)+labels[L2[temp][1]]) write_list.append("\n") elif L2[i][0]=="jgt": temp=i if L2[i][1] in variables_list: if L2[i][1] not in labels: f2.write("Variable used as label at line number"+str(i)) exit() if L2[i][1] not in labels: f2.write("Undefined label used at line number"+str(i)) exit() if FLAGS[14]=="1": num=int(labels[L2[i][1]]) i=num num_bin_str=str(format(num,f'0{7}b')) write_list.append(operations[L2[temp][0]]+("0"*4)+labels[L2[temp][1]]) write_list.append("\n") elif L2[i][0]=="je": temp=i if L2[i][1] in variables_list: if L2[i][1] not in labels: f2.write("Variable used as label at line number"+str(i)) exit() if L2[i][1] not in labels: f2.write("Undefined label used at line number"+str(i)) exit() if FLAGS[15]=="1": num=int(labels[L2[i][1]]) i=num num_bin_str=str(format(num,f'0{7}b')) write_list.append(operations[L2[temp][0]]+("0"4)+labels[L2[temp][1]]) write_list.append("\n") elif L2[i][0] in A: str1=eval(L2[i][1]) str2=eval(L2[i][2]) str3=eval(L2[i][3]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() str1eval="" str2eval="" str3eval="" for j in str1: str1eval+=j for j in str2: str2eval+=j for j in str3: str3eval+=j num1=int(str1eval,2) num2=int(str2eval,2) num3=int(str3eval,2) if L2[i][0]=="add": num1=num2+num3 if num1>127: num1=0 FLAGS[12]=1 elif L2[i][0]=="sub": num1=num2-num3 if num1<0: num1=0 FLAGS[12]=1 elif L2[i][0]=="mul": num1=num2num3 if num1>127: num1=0 FLAGS[12]=1 elif L2[i][0]=="xor": num1=num2^num3 elif L2[i][0]=="or": num1=num2|num3 elif L2[i][0]=="and": num1=num2&num3 str1val=str(format(num1,f'0{7}b')) str1val=list(str1val) str1[9:]=str1val write_list.append(operations[L2[i][0]]+("0"*2)+registers[str(L2[i][1])]+registers[str(L2[i][2])]+registers[str(L2[i][3])]) write_list.append("\n") elif L2[i][0]=="cmp": str1=eval(L2[i][1]) str2=eval(L2[i][2]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if L2[i][2] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() if str2 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() str1eval="" str2eval="" for j in str1: str1eval+=j for j in str2: str2eval+=j num1=int(str1eval,2) num2=int(str2eval,2) if num1>num2: FLAGS[14]="1" elif num1<num2: FLAGS[13]="1" elif num1==num2: FLAGS[15]="1" write_list.append(operations[L2[i][0]]+("0"*5)+registers[str(L2[i][1])]+registers[str(L2[i][2])]) write_list.append("\n") elif L2[i][0]=="not": str1=eval(L2[i][1]) str2=eval(L2[i][2]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if L2[i][2] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() if str2 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() str2eval="" for i in str2: str2eval+=i num1=int(str2eval,2) size=7 max=(2**size)-1 num1=max-num2 str1eval=str(format(num2,f'0{7}b')) str1eval=list(str2eval) str1[9:]=str1eval write_list.append(operations[L2[i][0]]+("0"*5)+str(L2[i][1])+str(L2[i][2])) write_list.append("\n") elif L2[i][0]=="rs": str1=eval(L2[i][1]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() num1=int(L2[i][2]) if num1>127: f2.write("Illegal immediate value at line number"+str(i)) exit() num1val=str(format(num1,f'0{7}b')) num1val=list(num1val) str1[7:16]=str1[0:9] str1[0:7]=num1val num_bin_str="" for j in num_bin: num_bin_str+=j write_list.append(operations[L2[i][0]]+"0"+str(L2[i][1])+str(num_bin_str)) write_list.append("\n") elif L2[i][0]=="ls": str1=eval(L2[i][1]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() num1=int(L2[i][2]) if num1>127: f2.write("Illegal immediate value at line number"+str(i)) exit() num1val=str(format(num1,f'0{7}b')) num1val=list(num1val) str1[0:9]=str1[7:16] str1[9:16]=num1val num_bin_str="" for j in num1val: num_bin_str+=j write_list.append(operations[L2[i][0]]+"0"+str(L2[i][1])+str(num_bin_str)) write_list.append("\n") elif L2[i][0]=="div": str1=eval(L2[i][1]) str2=eval(L2[i][2]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if L2[i][2] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() if str2 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() str1eval="" str2eval="" for i in str1: str1eval+=i for i in str2: str2eval+=i num1=int(str1eval,2) num2=int(str2eval,2) if num2==0: quot=0 rem=0 quot_bin=str(format(quot,f'0{7}b')) rem_bin=str(format(rem,f'0{7}b')) quot_bin=list(quot_bin) rem_bin=list(rem_bin) R1[9:]=quot_bin R2[9:]=rem_bin else: quot=num1//num2 rem=num1%num2 quot_bin=str(format(quot,f'0{7}b')) rem_bin=str(format(rem,f'0{7}b')) quot_bin=list(quot_bin) rem_bin=list(rem_bin) R1[9:]=quot_bin R2[9:]=rem_bin write_list.append(operations[L2[i][0]]+("0"*5)+str(L2[i][1])+str(L2[i][2])) write_list.append("\n") elif L2[i][0]=="mov": if L2[i][2] in list(registers.keys()): str1=eval(L2[i][1]) str2=eval(L2[i][2]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if L2[i][2] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() str1=str2.copy() write_list.append(operations[(L2[i][0]+"reg")]+("0"*5)+registers[str(L2[i][1])]+registers[str(L2[i][2])]) write_list.append("\n") else: str1=eval(L2[i][1]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() num=int(L2[i][2][1:]) if num>127: f2.write("Illegal immediate value at line number"+str(i)) exit() num_bin=str(format(num,f'0{7}b')) num_bin=list(num_bin) str1[9:]=num_bin num_bin_str="" for j in num_bin: num_bin_str+=j write_list.append(operations[(L2[i][0]+"imm")]+"0"+str(registers[str(L2[i][1])])+str(num_bin_str)) write_list.append("\n") elif L2[i][0]=="ld": str1=eval(L2[i][1]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() try: num2=variables[L2[i][2]] except: if L2[i][2] in labels: f2.write("Label used in place of variable") exit() else: f2.write("Undefined variable used") exit() #value=L2[num2] value_bin=str(format(num2,f'0{7}b')) #value_bin=list(value_bin) #str1[9:]=value_bin write_list.append(operations[L2[i][0]]+"0"+registers[str(L2[i][1])]+str(value_bin)) write_list.append("\n") elif L2[i][0]=="st": str1=eval(L2[i][1]) if L2[i][1] not in registers: f2.write("Typo in register name at line number"+str(i)) exit() if str1 is FLAGS: f2.write("Illegal use of FLAGS register at line number"+str(i)) exit() try: num2=variables[L2[i][2]] except: if L2[i][2] in labels: f2.write("Label used in place of variable") exit() else: f2.write("Undefined variable used") exit() #value=L2[num2] #str1eval="" #for i in str1: # str1eval+=i #value=int(str1eval,2) value_bin=str(format(num2,f'0{7}b')) #L2[num2]=value_bin write_list.append(operations[L2[i][0]]+"0"+registers[str(L2[i][1])]+str(value_bin)) write_list.append("\n") f.close() f2.writelines(write_list) f2.close()