[我已经实现了组装15个mips指令的简单汇编程序，程序从如图所示的用户获取指令并打印相应的机器代码输出txt文件，我的问题是如何修改代码使汇编程序需要无限的不。指令，直到用户中止他自己和他自己的程序在输出文件的新行中打印每个32位指令]
这是代码：
inst = raw_input("enter your instruction operation:")
if ((inst[0] == 'a' and inst[1] == 'd' and inst[2] == 'd' and inst[3] != 'i') or (inst[0] == 'a' and inst[1] == 'n' and inst[2] == 'd' and inst[3] != 'i') or (inst[0] == 'o' and inst[1] == 'r'and inst[2] != 'i') or (inst[0] == 'n' and inst[1] == 'o' and inst[2] == 'r') or (inst[0] == 's' and inst[1] == 'u' and inst[2] == 'b') or (inst[0] == 's' and inst[1] == 'l' and inst[2] == 'l') or(inst[0] == 's' and inst[1] == 'l' and inst[2] == 't')):
Rs = raw_input("enter the first operand:")
for i in range (0,32):
if(Rs == '$'+ str(i)):
rs = "{0:05b}".format(i)
opcode = '000000'
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs))
Mc_file.close()
Rt = raw_input("enter the 2nd operand:")
for i in range (0,32):
if(Rt == '$'+ str(i)):
rt = "{0:05b}".format(i)
opcode = '000000'
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt))
Mc_file.close()
Rd = raw_input("enter the destination operand:")
for i in range (0,32):
if(Rd == '$'+ str(i)):
rd = "{0:05b}".format(i)
opcode = '000000'
shamt ='00000'
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) +str(rd) + shamt)
Mc_file.close()
if(inst[0] == 'a' and inst[1] == 'd' and inst[2] == 'd'):
ass_inst = str(inst) + ' ' + str(Rd) + ',' + str(Rs) + ',' + str(Rt)
print "your assembly instruction is: %s" % (ass_inst)
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) +str(rd) + shamt + str('100000'))
Mc_file.close()
if(inst[0] == 'a' and inst[1] == 'n' and inst[2] == 'd'):
ass_inst = str(inst) + ' ' + str(Rd) + ',' + str(Rs) + ',' + str(Rt)
print "your assembly instruction is: %s" % (ass_inst)
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) +str(rd) + shamt + str('100100'))
Mc_file.close()
if(inst[0] == 'o' and inst[1] == 'r'):
ass_inst = str(inst) + ' ' + str(Rd) + ',' + str(Rs) + ',' + str(Rt)
print "your assembly instruction is: %s" % (ass_inst)
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) +str(rd) + shamt + str('100101'))
Mc_file.close()
if(inst[0] == 'n' and inst[1] == 'o' and inst[2] == 'r'):
ass_inst = str(inst) + ' ' + str(Rd) + ',' + str(Rs) + ',' + str(Rt)
print "your assembly instruction is: %s" % (ass_inst)
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) +str(rd) + shamt + str('100111'))
Mc_file.close()
if(inst[0] == 's' and inst[1] == 'u' and inst[2] == 'b'):
ass_inst = str(inst) + ' ' + str(Rd) + ',' + str(Rs) + ',' + str(Rt)
print "your assembly instruction is: %s" % (ass_inst)
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) +str(rd) + shamt + str('100010'))
Mc_file.close()
""" if(inst[0] == 'j' and inst[1] == 'r'):
ass_inst = str(inst) + ' ' + str(Rd) + ',' + str(Rs) + ',' + str(Rt)
print "your assembly instruction is: %s" % (ass_inst)
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str('00000') + str('00000') +str(rd) + shamt + str('001000'))
Mc_file.close()"""
if(inst[0] == 's' and inst[1] == 'l' and inst[2] == 'l'):
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) +str(rd) + shamt + str('000000'))
Mc_file.close()
if(inst[0] == 's' and inst[1] == 'l' and inst[2] == 't'):
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) +str(rd) + shamt + str('101010'))
Mc_file.close()
elif (inst[0] == 'l' and inst[1] == 'w'):
Rs = raw_input("enter the first operand:",)
for i in range (0,32):
if(Rs == '$'+ str(i)):
rs = "{0:05b}".format(i)
Rt = raw_input("enter the destination operand:")
for i in range (0,32):
if(Rt == '$'+ str(i)):
rt = "{0:05b}".format(i)
imediate = input("Enter the value of the offset:")
ass_inst = str(inst) + ' ' + str(Rs) + ',' + str(str(imediate) + '('+ str(Rt) + ')')
print " Entered assembly instruction is: %s " % ass_inst
opcode ='100011'
imd = "{0:016b}".format(imediate)
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) + str(imd))
Mc_file.close()
elif (inst[0] == 's' and inst[1] == 'w'):
Rs = raw_input("enter the destination operand:")
for i in range (0,32):
if(Rs == '$'+ str(i)):
rs = "{0:05b}".format(i)
Rt = raw_input("enter the source operand:")
for i in range (0,32):
if(Rt == '$'+ str(i)):
rt = "{0:05b}".format(i)
imediate = input("Enter the value of the offset:")
ass_inst = str(inst) + ' ' + str(Rs) + ',' + str(str(imediate) + '('+ str(Rt) + ')')
print "your assembly instruction is: %s" % (ass_inst)
imd = "{0:016b}".format(imediate)
opcode = '101011'
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) + str(imd))
Mc_file.close()
elif inst[0] == 'j' and inst[1] == 'r':
dr = raw_input("enter the destination register:")
inst_ = str(inst) + ' ' + str(dr)
print "The entered assembly instruction is %s" % inst_
for i in range(0,32):
if(dr == '$'+ str(i)):
addrss = "{0:026b}".format(i)
Mc_file = open("output.txt", "w")
opcode = '000011'
Mc_file.write(str(opcode) + str(addrss))
Mc_file.close()
elif inst[0] == 'b' and inst[1] == 'e' and inst[2] == 'q':
Rs = raw_input("enter the first operand to be compared:",)
for i in range (0,32):
if(Rs == '$'+ str(i)):
rs = "{0:05b}".format(i)
Rt = raw_input("enter the second operand to be compared:")
for i in range (0,32):
if(Rt == '$'+ str(i)):
rt = "{0:05b}".format(i)
imediate = input("Enter the branch target address:")
ass_inst = (str(inst) + ' ' + str(Rs) + ',' + str(Rt) + ' ' + str(imediate))
print " Entered assembly instruction is: %s " % ass_inst
imd = "{0:016b}".format(imediate)
opcode = '000100'
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) + str(imd))
Mc_file.close()
elif (inst[0] == 'a' and inst[1] == 'n' and inst[2] == 'd'and inst[3] == 'i'):
Rs = raw_input("enter the first operand:")
for i in range (0,32):
if(Rs == '$'+ str(i)):
rs = "{0:05b}".format(i)
Rt = raw_input("enter the second operand:")
for i in range (0,32):
if(Rt == '$'+ str(i)):
rt = "{0:05b}".format(i)
imediate = input("Enter the Imediate number:")
ass_inst = (str(inst) + ' ' + str(Rs) + ',' + str(Rt) + ' ' + str(imediate))
print " Entered assembly instruction is: %s " % ass_inst
imd = "{0:016b}".format(imediate)
opcode = '000100'
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) + str(imd))
Mc_file.close()
elif (inst[0] == 'o' and inst[1] == 'r' and inst[2] == 'i'):
Rs = raw_input("enter the first operand:")
for i in range (0,32):
if(Rs == '$'+ str(i)):
rs = "{0:05b}".format(i)
Rt = raw_input("enter the second operand:")
for i in range (0,32):
if(Rt == '$'+ str(i)):
rt = "{0:05b}".format(i)
imediate = input("Enter the Imediate number:")
ass_inst = (str(inst) + ' ' + str(Rs) + ',' + str(Rt) + ' ' + str(imediate))
print " Entered assembly instruction is: %s " % ass_inst
imd = "{0:016b}".format(imediate)
opcode = '001101'
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) + str(imd))
Mc_file.close()
elif (inst[0] == 'a' and inst[1] == 'd' and inst[2] == 'd'and inst[3] == 'i'):
Rs = raw_input("enter the first operand:")
for i in range (0,32):
if(Rs == '$'+ str(i)):
rs = "{0:05b}".format(i)
Rt = raw_input("enter the second operand:")
for i in range (0,32):
if(Rt == '$'+ str(i)):
rt = "{0:05b}".format(i)
imediate = input("Enter the Imediate number:")
ass_inst = (str(inst) + ' ' + str(Rs) + ',' + str(Rt) + ' ' + str(imediate))
print " Entered assembly instruction is: %s " % ass_inst
imd = "{0:016b}".format(imediate)
opcode = '001000'
Mc_file = open("output.txt", "w")
Mc_file.write(str(opcode) + str(rs) + str(rt) + str(imd))
Mc_file.close()
else:
print "Not supported operation!"
答案 0 :(得分：1)
您可以使用while True无限循环：
while True:
inst = raw_input("enter your instruction operation or 'q' to quit:")
if inst.lower() in ("q", "quit"):
break
# rest of code goes here
您可以{@ 1}}此循环之前的文件和open一行一行，或者每次通过write（“追加”）中的循环重新打开文件模式。