Re: OpenMP 3.0 libgomp ABI documentation for TASK construct

[Qihang Huang <qihang.huang@gmail.com>]

That's super! Thank you Antoniu. With the capacity of printing the
expanded code, it feels a lot more freedom now when reading the source
code of libgomp.

Cheers,
Tim

On Mon, Oct 5, 2009 at 8:29 AM, Antoniu Pop
<antoniu.pop@mines-paristech.fr> wrote:
> Hi Tim,
>
>
>> From gcc online docs (http://gcc.gnu.org/onlinedocs/libgomp/), I found
>> documentations for most of OpenMP constructs, except one very
>> important construct TASK.
>
> I cannot answer this. It may be that the documentation was written
> before tasks (which were introduced in a latter version  of OpenMP)
> were added to GCC OpenMP.
>
>>
>> I don't know why it is missing, but I really
>> need to find out how TASK get transformed into GOMP_* routines. I
>> posted this question before, but haven't got a reply yet. I am very
>> grateful if someone can point me to the right track. For example, is
>> there a pretty-print feature of the AST after processing the OpenMP
>> pragmas? If so, how? Of course, if someone have the expertise, and
>> directly show me how TASK get transformed, it would be even better!
>
>
> For the pretty print, just use -fdump-tree-ompexp-all on the compile
> line and look for the file *.c.*ompexp that is generated. It contains
> the dump just after OpenMP expansion.
>
> If you need to check out the code generation routines by yourself,
> take a look at gcc/omp-low.c
> Most of everything happens there. There are two passes, OpenMP
> lowerring then expansion. The generation of the GOMP_* routine calls
> happens during expansion pass and so you should start from the
> "expand_omp_taskreg" function (in gcc/omp-low.c).
>
> Best,
> Antoniu
>