如何存储goto标签在数组，然后跳转到他们？ [英] How to store goto labels in an array and then jump to them?

问题描述

我要声明一个jumplabels数组。

I want to declare an array of "jumplabels".

然后我要跳转到这个数组中的jumplabel。

Then I want to jump to a "jumplabel" in this array.

但我不知道该怎么做。

它应该看起来像下面的代码：

It should look like the following code:

function()
{
    "gotolabel" s[3];
    s[0] = s0;
    s[1] = s1;
    s[2] = s2;

    s0:
    ....
    goto s[v];

    s1:
    ....
    goto s[v];

    s2:
    ....
    goto s[v];
}

有没有人知道如何执行此操作？

Does anyone have a idea how to perform this?

推荐答案

有可能使用GCC功能称为标签作为值。

It is possible with GCC feature known as "labels as values".

void *s[3] = {&&s0, &&s1, &&s2};

if (n >= 0 && n <=2)
    goto *s[n];

s0:
...
s1:
...
s2:
...

它仅适用于GCC！

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