Question

我编写了这段代码，其中我必须从文件中读取指令并必须识别每条指令，最后我要将这些指令放在列表中。

我创建了一个对象列表来描述每条指令（操作码，源..）

我的问题是，当我从文件中读取每一行（指令）时，我想获取指令的操作码以了解如何工作并从指令行中提取其他信息我试图像这样切换大小写：

def OpcodeSwitcher(inst_opcode) :
    switcher = {
         'ADD': add_sub_branch(line), #function I call when the instruction is ADD
         'SUB': print(1)
 }

然后调用此函数，该函数是我从行中提取的操作码，但是在无限循环中被击中了！

我只是想不通，有什么帮助吗？

这是一个非常小的文件的示例：

ADD $3, $0, 4
SUB $7, $0, 1
# Program ends with infinite loop (avoid fall-through to undefined data following the end of the program)
# Data for this program. Any other location that is not explicitly set is implicitly set to zero.
D@0x000032A0
0x12345678
0xFFFFFFFF

这是主文件：

    import sys
    import memory as Memory


    # main

    file_name = sys.argv[1]
    print("Loading memory image file:", file_name)
    Memory.sim_mem_reset(file_name)

这是内存文件：

    import sys


    instructionsList = []


    class Sim_cmd(object) :
        def __init__(self, opcode, src1, src2,isSrc2Imm,dst) :
            self.opcode=opcode
            self.src1=src1
            self.src2=src2
            self.isSrc2Imm=isSrc2Imm
            self.dst=dst




    def get_inst(line,inst_num) :
        inst_opcode=line.split(' ', 1)[0]

        # here I am trying to do a case switch statement on the inst_opcode
        # for example if the opcode is "ADD" I would like to call a function to handle 
        # this line to fill the instructionsList which means to do something like this
        # instructionsList.append(Sim_cmd(inst_opcode,0,0,0,0))



    def sim_mem_reset(memFileName):
        with open(memFileName, 'r+') as fileName:
            for line in fileName:
                if line[0] == '#' or len(line.strip()) == 0:
                    continue

                inst = 0
                while len(line.strip()) != 0 and line[0] != '#' and line[0] != 'D':
                    get_inst(line, inst)
                    inst += 1

                # here the data memory begin
                if line[0] == 'D' and line[1] == '@':
                #some code

如何在python中使用switch case，在每种情况下分别调用特定函数？

0 个答案: