Re: -fdump-passes -fenable-xxx=func_name_list

[Xinliang David Li <davidxl@google.com>]

On Wed, Jun 1, 2011 at 1:51 AM, Richard Guenther
<richard.guenther@gmail.com> wrote:
> On Wed, Jun 1, 2011 at 1:34 AM, Xinliang David Li <davidxl@google.com> wrote:
>> The following patch implements the a new option that dumps gcc PASS
>> configuration. The sample output is attached.  There is one
>> limitation: some placeholder passes that are named with '*xxx' are
>> note registered thus they are not listed. They are not important as
>> they can not be turned on/off anyway.
>>
>> The patch also enhanced -fenable-xxx and -fdisable-xx to allow a list
>> of function assembler names to be specified.
>>
>> Ok for trunk?
>
> Please split the patch.
>
> I'm not too happy how you dump the pass configuration.  Why not simply,
> at a _single_ place, walk the pass tree?  Instead of doing pieces of it
> at pass execution time when it's not already dumped - that really looks
> gross.

Yes, that was the original plan -- but it has problems
1) the dumper needs to know the root pass lists -- which can change
frequently -- it can be a long term maintanance burden;
2) the centralized dumper needs to be done after option processing
3) not sure if gate functions have any side effects or have dependencies on cfun

The proposed solutions IMHO is not that intrusive -- just three hooks
to do the dumping and tracking indentation.

>
> The documentation should also link this option to the -fenable/disable
> options as obviously the pass names in that dump are those to be
> used for those flags (and not readily available anywhere else).

Ok.

>
> I also think that it would be way more useful to note in the individual
> dump files the functions (at the place they would usually appear) that
> have the pass explicitly enabled/disabled.

Ok -- for ipa passes or tree/rtl passes where all functions are
explicitly disabled.

Thanks,

David

>
> Richard.
>
>> Thanks,
>>
>> David
>>
>