[GAP Forum] Help for debugging GAP

[Asst. Prof. Dmitrii (Dima) Pasechnik]

Dear Wangtao,

On 19 October 2011 10:56, wangtao <wangtao2010 at ict.ac.cn> wrote:

>  I want to know some detail information of how GAP are debugging. For
> example, the result of Combinations([0]) should be [] [0], but the result of
> the executable GAP compiled by loongcc(the compiler we are developing) is []
> [], thus, there is error in loongcc that generates improper instructions.
> But I have no idea where to set the break point in GAP because I don't know
> how Combinations([0]) is evaluated, namely, which gap function is called
> firstly and which secondly, etc. I've read GAP user manual and find no
> answer.

You should read GAP source to find out.
Actually, Combinations is implemented in GAP language,
which makes it quite easy to understand.

To see this, you don't even need to read the source, you can do
gap> Print(Combinations);
at the GAP prompt)
When called with one argument, Combinations calls CombinationsA,
which is also implemented in GAP language.

Hope this helps,
Dmitrii


>
>
>
>  Can anybody give me some help? You can show me the call stack when gap is
> evaluating Combinations([0]) or give me some material about how gap is
> design.
>
>  Thank you very much.
>
>
>
> Best regards
>
> Wang Tao
>
> ============================================================
>
> Wang Tao
>
> Compiler Team, National key laboratory of Computer Architecture
>
> Institute of Computing technology, Chinese Academy of Science
>
> Mail: Wangtao2010 at ict.ac.cn
>
>
>
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