🚀 go-pugleaf

In article <1992Feb21.033356.18370@athena.mit.edu> mjhostet@slayer.mit.edu (Mat Hostetter) writes:

>In article <1992Feb21.023817.17703@athena.mit.edu> mjhostet@slayer.mit.edu (Mat  
>Hostetter) writes:
>> I saw in the GNU status report that "C has been extended to support
>> nested functions, nonlocal gotos, and taking the address of a label."
>> 
>> Will there be any way to have an array of label-pointers and dispatch to the  
>> one I want?  (eg, "goto label_array[x]".)  (I basically need a switch that  
>does  
>> no bounds checking, for a really speed-intensive loop.)
>> 
>> -Mat

This looks kind of like what you want, no?

I just got gcc 2.0 built and tried it... The code isn't pretty
but works like a charm....

Check out: gcc.info,  Node: Labels as Values.

-Skip

main()
{
    static void *array[] = { &&lab0, &&lab1, &&lab2, &&lab3, &&lab4 };
    int i = 5;

top_loop:
    if (--i < 0)
	exit(0);

     goto *array[i];

lab0:	printf("lab0\n"); goto top_loop;
lab1:	printf("lab1\n"); goto top_loop;
lab2:	printf("lab2\n"); goto top_loop;
lab3:	printf("lab3\n"); goto top_loop;
lab4:	printf("lab4\n"); goto top_loop;
}
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