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昨天我在 Assembly 中发布了一个关于我的递归斐波那契程序的问题。我现在得到了正确的输出,这要感谢这里出色的人们的帮助,但是在打印出正确的输出后,我的程序立即崩溃了。

这是调用斐波那契程序给定次数的序列程序(存储在 L 中)

.386
.model Flat
public Sequence
extrn Fibonacci:proc
include iosmacros.inc
.code
Sequence proc
    MOV L, EAX
    XOR ECX, ECX ;start count at 0
    sequ:
    CMP ECX, L
        JA endseq ;if we have passed the given value (L), end
        putstr MsgOut1
        putint ECX ;number passed to Fibonacci
        putstr MsgOut2
        MOV count, ECX ;preserve count
        PUSH ECX
        CALL Fibonacci ;call Fibonacci
        putint ECX
        putch ' '
        MOV ECX, count ;restore count
        INC ECX ;increment the count
        JMP sequ ;again
    endseq:
        putint ecx
    ret
Sequence endp

.data
    MsgOut1 DB "Fib(", 0, 0 ;first half of output message
    MsgOut2 DB ") = ", 0, 0 ;second half of output message
    L DD, 0, 0 ;number of sequences to carry out
    count DD 0,0 ;for counting
end

这是调用序列过程的代码:

.386
.model flat
extrn Sequence:proc
include Cs266.inc
.data
    Msg DB "Please input the number of sequences you would like carried out", 0Ah, 0 ;input request message
    err DB "reached end"

.code
include Rint.inc
    main:
        putstr Msg
        CALL Rint ;store int in EAX
        CALL Sequence
                putstr err
    ret

end

斐波那契代码如下:

.386
.model Flat
public Fibonacci
include iosmacros.inc ;includes macros for outputting to the screen

.code
Fibonacci proc

    MOV ECX, [ESP+4]
    CMP ECX, 1
        JA Recurse
        MOV ECX, 1 ;return value in ECX
        JMP exit

Recurse:
    PUSH EBX ;preserve value of EBX
    DEC ECX
    PUSH ECX
    CALL Fibonacci
    MOV EBX, ECX ;EBX is preserved, so safe to use
    DEC [ESP] ;decrement the value already on the stack
    CALL Fibonacci
    ADD ECX, EBX ;return value in ECX
    ADD ESP, 4 ;remove value from stack
    POP EBX ;restore old value of EBX
exit:
ret
Fibonacci endp

.data
end

我在这里发布了一堆代码,但这只是为了方便您为我指明正确的方向。我相信问题可能出在序列中,而我的调试器对我没有帮助。

编辑:就错误而言,我得到的只是:http: //imgur.com/XulTl 如果我确实启用了 Visual Studio Just-In-Time 调试,它永远不会有帮助。

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1 回答 1

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嗯......在你的Fibonacci,我看到两个pushes ,只有一个pop。至少乍一看,这似乎有点问题。

于 2011-04-12T03:15:41.810 回答