用c语言编写一个简单的组译器

2008-04-02 12:10:38 186 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

ServiceNow Discovery & CMDB Interview Questions and Answers (2025) 【代码】ServiceNow Discovery & CMDB Interview Questions and Answers (2025) 阅读详情

用c语言编写一个简单的组译器
要求：1 一行一行读取输入文件
2 将输入文件的每一行转化成记忆码，操作码，标签等
3 对无效的指令或者操作码进行操作
运行程序的时候输入指令为
./assembler <输入文件> <输出文件>

小弟初学，看到题目很迷茫，望各位高手给个简单的例子就行，先谢过。

...全文

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切换为时间正序

meiZiNick 2008-05-01

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没遇到过这种情况.

UltraBejing 2008-05-01

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我也想知道，正在找這方面的資料~~~~~

knowledge_Is_Life 2008-04-30

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以后需再关注，现在先帮你顶一下

dongyi940333 2008-04-03

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学习了,谢谢jennyvenus

sk_soju 2008-04-03

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这个函数就是用来做加减法的么
运行的时候输入
./assembler <输入文件> <输出文件>
这里的输入和输出都是些啥文件啊

huxiaolai 2008-04-03

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看不懂,没学到什么,
顶下

用户　昵称 2008-04-02

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    If Decom(i) = "WORD" And Decom(i + 1) = "PTR" Then

        '[]=============[]

        '[]列举可能的方式

        '[]mov word ptr [1000h],1

        '[]mov word ptr [si],1

        '[]mov word ptr [si+d8],1

        '[]mov word ptr [si+d16],1

        '[]mov word ptr [bx+si],1

        '[]mov word ptr [bx+si+d8],1

        '[]mov word ptr [bx+si+d16],1

        '[]=============[]

        If Is_Dir_Mem(i + 2) Then

            ADD_OR_SUB = WORDPTR_DIRMEM_0(OPT, Decom(i + 3), Decom(i + 6))

        ElseIf Is_InDir_Mem(i + 2) Then

            ADD_OR_SUB = WORDPTR_INDIRMEM_0(OPT, Decom(i + 3), Decom(i + 6))

        ElseIf Is_InDir_Mem8(i + 2) Then

            ADD_OR_SUB = WORDPTR_INDIRMEM8_0(OPT, Decom(i + 3), Decom(i + 4), Decom(i + 5), Decom(i + 8))

        ElseIf Is_InDir_Mem16(i + 2) Then

            ADD_OR_SUB = WORDPTR_INDIRMEM16_0(OPT, Decom(i + 3), Decom(i + 4), Decom(i + 5), Decom(i + 8))

        ElseIf Is_Base_Mem(i + 2) Then

            ADD_OR_SUB = WORDPTR_BASEMEM_0(OPT, Decom(i + 3), Decom(i + 5), Decom(i + 8))

        ElseIf Is_Base_Mem8(i + 2) Then

            ADD_OR_SUB = WORDPTR_BASEMEM8_0(OPT, Decom(i + 3), Decom(i + 5), Decom(i + 6), Decom(i + 7), Decom(i + 9))

        ElseIf Is_Base_Mem16(i + 2) Then

            ADD_OR_SUB = WORDPTR_BASEMEM16_0(OPT, Decom(i + 3), Decom(i + 5), Decom(i + 6), Decom(i + 7), Decom(i + 9))

        End If

    End If

    '--------------------------------------------------

    '++++++++++++++++++++++++++++++++++++++++++++++++++

    If IsWord(Decom(i)) Then

        If IsWord(Decom(i + 2)) Then

            If OPT = "XCHG" And Decom(i) = "AX" And Decom(i + 2) = "AX" Then

                ADD_OR_SUB = "90"

            Else

                ADD_OR_SUB = word1 & WORD_WORD(Decom(i), Decom(i + 2))

            End If

        ElseIf IsImme(i + 2) Then

            ADD_OR_SUB = WORD_IMME_0(OPT, Decom(i), Decom(i + 2))

        ElseIf Is_Dir_Mem(i + 2) Then

            ADD_OR_SUB = WORD_DIR_MEM_0(OPT, Decom(i), Decom(i + 3))

        ElseIf Is_InDir_Mem(i + 2) Then

            ADD_OR_SUB = word2 & WORD_INDIR_MEM(Decom(i), Decom(i + 3))

        ElseIf Is_InDir_Mem8(i + 2) Then

            ADD_OR_SUB = word2 & WORD_INDIR_MEM8(Decom(i), Decom(i + 3), Decom(i + 4), Decom(i + 5))

        ElseIf Is_InDir_Mem16(i + 2) Then

            ADD_OR_SUB = word2 & WORD_INDIR_MEM16(Decom(i), Decom(i + 3), Decom(i + 4), Decom(i + 5))

        ElseIf Is_Base_Mem(i + 2) Then

            ADD_OR_SUB = word2 & WORD_BASE_MEM(Decom(i), Decom(i + 3), Decom(i + 5))

        ElseIf Is_Base_Mem8(i + 2) Then

            ADD_OR_SUB = word2 & WORD_BASE_MEM8(Decom(i), Decom(i + 3), Decom(i + 5), Decom(i + 6), Decom(i + 7))

        ElseIf Is_Base_Mem16(i + 2) Then

            ADD_OR_SUB = word2 & WORD_BASE_MEM16(Decom(i), Decom(i + 3), Decom(i + 5), Decom(i + 6), Decom(i + 7))

        End If

    End If

    '----------------------------------------------------------------

    '++++++++++++++++++++++++++++++++++++++++++++++++++

    If IsByte(Decom(i)) Then

        If IsByte(Decom(i + 2)) Then

            ADD_OR_SUB = byte1 & BYTE_BYTE(Decom(i), Decom(i + 2))

        ElseIf IsImme(i + 2) Then

            ADD_OR_SUB = BYTE_IMME_0(OPT, Decom(i), Decom(i + 2))

        ElseIf Is_Dir_Mem(i + 2) Then

            ADD_OR_SUB = BYTE_DIR_MEM_0(OPT, Decom(i), Decom(i + 3))

        ElseIf Is_InDir_Mem(i + 2) Then

            ADD_OR_SUB = byte2 & BYTE_INDIR_MEM(Decom(i), Decom(i + 3))

        ElseIf Is_InDir_Mem8(i + 2) Then

            ADD_OR_SUB = byte2 & BYTE_INDIR_MEM8(Decom(i), Decom(i + 3), Decom(i + 4), Decom(i + 5))

        ElseIf Is_InDir_Mem16(i + 2) Then

            ADD_OR_SUB = byte2 & BYTE_INDIR_MEM16(Decom(i), Decom(i + 3), Decom(i + 4), Decom(i + 5))

        ElseIf Is_Base_Mem(i + 2) Then

            ADD_OR_SUB = byte2 & BYTE_BASE_MEM(Decom(i), Decom(i + 3), Decom(i + 5))

        ElseIf Is_Base_Mem8(i + 2) Then

            ADD_OR_SUB = byte2 & BYTE_BASE_MEM8(Decom(i), Decom(i + 3), Decom(i + 5), Decom(i + 6), Decom(i + 7))

        ElseIf Is_Base_Mem16(i + 2) Then

            ADD_OR_SUB = byte2 & BYTE_BASE_MEM16(Decom(i), Decom(i + 3), Decom(i + 5), Decom(i + 6), Decom(i + 7))

        End If

    End If

    '----------------------------------------------------------------

    If Decom(i) = "[" Then

        If Is_Dir_Mem(i) Then

            If IsByte(Decom(i + 4)) Then

                ADD_OR_SUB = DIR_MEM_BYTE_0(OPT, Decom(i + 1), Decom(i + 4))

            ElseIf IsWord(Decom(i + 4)) Then

                ADD_OR_SUB = DIR_MEM_WORD_0(OPT, Decom(i + 1), Decom(i + 4))

            End If

        ElseIf Is_InDir_Mem(i) Then

            If IsByte(Decom(i + 4)) Then

                ADD_OR_SUB = mem1 & INDIR_MEM_BYTE(Decom(i + 1), Decom(i + 4))

            ElseIf IsWord(Decom(i + 4)) Then

                ADD_OR_SUB = mem2 & INDIR_MEM_WORD(Decom(i + 1), Decom(i + 4))

            End If

        ElseIf Is_InDir_Mem8(i) Then

            If IsByte(Decom(i + 6)) Then

                ADD_OR_SUB = mem1 & INDIR_MEM8_BYTE(Decom(i + 1), Decom(i + 2), Decom(i + 3), Decom(i + 6))

            ElseIf IsWord(Decom(i + 6)) Then

                ADD_OR_SUB = mem2 & INDIR_MEM8_WORD(Decom(i + 1), Decom(i + 2), Decom(i + 3), Decom(i + 6))

            End If

        ElseIf Is_InDir_Mem16(i) Then

            If IsByte(Decom(i + 6)) Then

                ADD_OR_SUB = mem1 & INDIR_MEM16_BYTE(Decom(i + 1), Decom(i + 2), Decom(i + 3), Decom(i + 6))

            ElseIf IsWord(Decom(i + 6)) Then

                ADD_OR_SUB = mem2 & INDIR_MEM16_WORD(Decom(i + 1), Decom(i + 2), Decom(i + 3), Decom(i + 6))

            End If

        ElseIf Is_Base_Mem(i) Then

            If IsByte(Decom(i + 6)) Then

                ADD_OR_SUB = mem1 & BASE_MEM_BYTE(Decom(i + 1), Decom(i + 3), Decom(i + 6))

            ElseIf IsWord(Decom(i + 6)) Then

                ADD_OR_SUB = mem2 & BASE_MEM_WORD(Decom(i + 1), Decom(i + 3), Decom(i + 6))

            End If

        ElseIf Is_Base_Mem8(i) Then

            If IsByte(Decom(i + 8)) Then

                ADD_OR_SUB = mem1 & BASE_MEM8_BYTE(Decom(i + 1), Decom(i + 3), Decom(i + 4), Decom(i + 5), Decom(i + 8))

            ElseIf IsWord(Decom(i + 8)) Then

                ADD_OR_SUB = mem2 & BASE_MEM8_WORD(Decom(i + 1), Decom(i + 3), Decom(i + 4), Decom(i + 5), Decom(i + 8))

            End If

        ElseIf Is_Base_Mem16(i) Then

            If IsByte(Decom(i + 8)) Then

                ADD_OR_SUB = mem1 & BASE_MEM16_BYTE(Decom(i + 1), Decom(i + 3), Decom(i + 4), Decom(i + 5), Decom(i + 8))

            ElseIf IsWord(Decom(i + 8)) Then

                ADD_OR_SUB = mem2 & BASE_MEM16_WORD(Decom(i + 1), Decom(i + 3), Decom(i + 4), Decom(i + 5), Decom(i + 8))

            End If

        End If

    End If

这只是当时的一个函数。

用户　昵称 2008-04-02

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        Case "LDS"

            word1 = "C5"

            word2 = "C5"

        Case "LES"

            word1 = "C4"

            word2 = "C4"

        Case "LEA"

            word1 = "8D"

            word2 = "8D"

        Case Else

    End Select

    If (Decom(i) = "BYTE" Or Decom(i) = "DWORD") And Decom(i + 1) = "PTR" Then

        '[]=============[]

        '[]列举可能的方式

        '[]mov byte ptr [1000h],1

        '[]mov byte ptr [si],1

        '[]mov byte ptr [si+d8],1

        '[]mov byte ptr [si+d16],1

        '[]mov byte ptr [bx+si],1

        '[]mov byte ptr [bx+si+d8],1

        '[]mov byte ptr [bx+si+d16],1

        '[]=============[]

        If Is_Dir_Mem(i + 2) Then

            ADD_OR_SUB = BYTEPTR_DIRMEM_0(OPT, Decom(i + 3), Decom(i + 6))

        ElseIf Is_InDir_Mem(i + 2) Then

            ADD_OR_SUB = BYTEPTR_INDIRMEM_0(OPT, Decom(i + 3), Decom(i + 6))

        ElseIf Is_InDir_Mem8(i + 2) Then

            ADD_OR_SUB = BYTEPTR_INDIRMEM8_0(OPT, Decom(i + 3), Decom(i + 4), Decom(i + 5), Decom(i + 8))

        ElseIf Is_InDir_Mem16(i + 2) Then

            ADD_OR_SUB = BYTEPTR_INDIRMEM16_0(OPT, Decom(i + 3), Decom(i + 4), Decom(i + 5), Decom(i + 8))

        ElseIf Is_Base_Mem(i + 2) Then

            ADD_OR_SUB = BYTEPTR_BASEMEM_0(OPT, Decom(i + 3), Decom(i + 5), Decom(i + 8))

        ElseIf Is_Base_Mem8(i + 2) Then

            ADD_OR_SUB = BYTEPTR_BASEMEM8_0(OPT, Decom(i + 3), Decom(i + 5), Decom(i + 6), Decom(i + 7), Decom(i + 9))

        ElseIf Is_Base_Mem16(i + 2) Then

            ADD_OR_SUB = BYTEPTR_BASEMEM16_0(OPT, Decom(i + 3), Decom(i + 5), Decom(i + 6), Decom(i + 7), Decom(i + 9))

        End If

    End If

End Function

用户　昵称 2008-04-02

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我以前写过VB的。当时虽然知道有规则，但是并没有按规则写，都是逐个匹配翻译的。



Public Function ADD_OR_SUB(ByVal OPT As String) As String

    Dim i As Long

    Dim word1 As String

    Dim word2 As String

    Dim byte1 As String

    Dim byte2 As String

    Dim mem1 As String

    Dim mem2 As String

    i = 4

    Select Case OPT

        Case "ADC"

            word1 = "11"

            word2 = "13"

            byte1 = "10"

            byte2 = "12"

            mem1 = "10"

            mem2 = "11"

        Case "ADD"

            word1 = "01"

            word2 = "03"

            byte1 = "00"

            byte2 = "02"

            mem1 = "00"

            mem2 = "01"

        Case "AND"

            word1 = "21"

            word2 = "23"

            byte1 = "20"

            byte2 = "22"

            mem1 = "20"

            mem2 = "21"

        Case "CMP"

            word1 = "39"

            word2 = "3B"

            byte1 = "38"

            byte2 = "3A"

            mem1 = "38"

            mem2 = "39"

        Case "OR"

            word1 = "09"

            word2 = "0B"

            byte1 = "08"

            byte2 = "0A"

            mem1 = "08"

            mem2 = "09"

        Case "SBB"

            word1 = "19"

            word2 = "1B"

            byte1 = "18"

            byte2 = "1A"

            mem1 = "18"

            mem2 = "19"

        Case "SBB"

            word1 = "29"

            word2 = "2B"

            byte1 = "28"

            byte2 = "2A"

            mem1 = "28"

            mem2 = "29"

        Case "TEST"

            word1 = "85"

            word2 = "85"

            byte1 = "84"

            byte2 = "84"

            mem1 = "84"

            mem2 = "85"

        Case "XOR"

            word1 = "31"

            word2 = "33"

            byte1 = "30"

            byte2 = "32"

            mem1 = "30"

            mem2 = "31"

        Case "XCHG"

            word1 = "87"

            word2 = "87"

            byte1 = "86"

            byte2 = "86"

            mem1 = "86"

            mem2 = "87"

sk_soju 2008-04-02

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关键问题是我现在都不知道怎样入手有什么最简单的例子可以借用一下的么

用户　昵称 2008-04-02

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俺正在做这个玩，其实很复杂的，最麻烦的就是各种指令如何转换成机器码，虽然有一定的规则，然后实现起来还是得逐个分析。

用c语言编写一个简单的组译器

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