How to store goto labels in an array and then jump to them?

c++ c goto jump-table
youllknow picture youllknow · Jun 2, 2009 · Viewed 10.7k times · Source

I want to declare an array of "jumplabels".

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

But I have not any idea how to do this.

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];
}

Does anyone have a idea how to perform this?

Answer

qrdl picture qrdl · Jun 2, 2009

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:
...

It works only with GCC!

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