Dump before flag

Xinliang David Li davidxl@google.com
Tue Jun 14 16:02:00 GMT 2011


On Tue, Jun 14, 2011 at 6:58 AM, Richard Guenther
<richard.guenther@gmail.com> wrote:
> On Fri, Jun 10, 2011 at 8:44 PM, Xinliang David Li <davidxl@google.com> wrote:
>> This is the revised patch as suggested.
>>
>> How does it look?
>
>  }
>
> +static void
> +execute_function_dump (void *data ATTRIBUTE_UNUSED)
>
> function needs a comment.
>
> Ok with that change.
>
> Please always specify how you tested the patch - the past fallouts
> suggest you didn't do the required testing carefully.

I think I did -- the fallout was probably due to different
'--enable-checking' setting. I have now turned it to 'yes'

Thanks,

David

>
> A changelog is missing as well.
>
> Thanks,
> Richard.
>
>> Thanks,
>>
>> David
>>
>> On Fri, Jun 10, 2011 at 9:22 AM, Xinliang David Li <davidxl@google.com> wrote:
>>> On Fri, Jun 10, 2011 at 1:52 AM, Richard Guenther
>>> <richard.guenther@gmail.com> wrote:
>>>> On Thu, Jun 9, 2011 at 5:47 PM, Xinliang David Li <davidxl@google.com> wrote:
>>>>> See attached.
>>>>
>>>> Hmm.  I don't like how you still wire dumping in the TODO routines.
>>>> Doesn't it work to just dump the body from pass_fini_dump_file ()?
>>>> Or if that doesn't sound clean from (a subset of) places where it
>>>> is called? (we might want to exclude the ipa read/write/summary
>>>> stages)
>>>
>>> That may require another round of function traversal -- but probably
>>> not a big deal -- it sounds cleaner.
>>>
>>> David
>>>
>>>>
>>>> Richard.
>>>>
>>>>> Thanks,
>>>>>
>>>>> David
>>>>>
>>>>> On Thu, Jun 9, 2011 at 2:02 AM, Richard Guenther
>>>>> <richard.guenther@gmail.com> wrote:
>>>>>> On Thu, Jun 9, 2011 at 12:31 AM, Xinliang David Li <davidxl@google.com> wrote:
>>>>>>> this is the patch that just removes the TODO_dump flag and forces it
>>>>>>> to dump. The original code cfun->last_verified = flags &
>>>>>>> TODO_verify_all looks weird -- depending on TODO_dump is set or not,
>>>>>>> the behavior of the update is different (when no other todo flags is
>>>>>>> set).
>>>>>>>
>>>>>>> Ok for trunk?
>>>>>>
>>>>>> -ENOPATCH.
>>>>>>
>>>>>> Richard.
>>>>>>
>>>>>>> David
>>>>>>>
>>>>>>> On Wed, Jun 8, 2011 at 9:52 AM, Xinliang David Li <davidxl@google.com> wrote:
>>>>>>>> On Wed, Jun 8, 2011 at 2:06 AM, Richard Guenther
>>>>>>>> <richard.guenther@gmail.com> wrote:
>>>>>>>>> On Wed, Jun 8, 2011 at 1:08 AM, Xinliang David Li <davidxl@google.com> wrote:
>>>>>>>>>> The following is the patch that does the job. Most of the changes are
>>>>>>>>>> just  removing TODO_dump_func. The major change is in passes.c and
>>>>>>>>>> tree-pass.h.
>>>>>>>>>>
>>>>>>>>>> -fdump-xxx-yyy-start       <-- dump before TODO_start
>>>>>>>>>> -fdump-xxx-yyy-before    <-- dump before main pass after TODO_pass
>>>>>>>>>> -fdump-xxx-yyy-after       <-- dump after main pass before TODO_finish
>>>>>>>>>> -fdump-xxx-yyy-finish      <-- dump after TODO_finish
>>>>>>>>>
>>>>>>>>> Can we bikeshed a bit more about these names?
>>>>>>>>
>>>>>>>> These names may be less confusing:
>>>>>>>>
>>>>>>>> before_preparation
>>>>>>>> before
>>>>>>>> after
>>>>>>>> after_cleanup
>>>>>>>>
>>>>>>>> David
>>>>>>>>
>>>>>>>>> "start" and "before"
>>>>>>>>> have no semantical difference to me ... as the dump before TODO_start
>>>>>>>>> of a pass and the dump after TODO_finish of the previous pass are
>>>>>>>>> identical (hopefully ;)), maybe merge those into a -between flag?
>>>>>>>>> If you'd specify it for a single pass then you'd get both -start and -finish
>>>>>>>>> (using your naming scheme).  Splitting that dump(s) to different files
>>>>>>>>> then might make sense (not sure about the name to use).
>>>>>>>>>
>>>>>>>>> Note that I find it extremely useful to have dumping done in
>>>>>>>>> chronological order - splitting some of it to different files destroys
>>>>>>>>> this, especially a dump after TODO_start or before TODO_finish
>>>>>>>>> should appear in the same file (or we could also start splitting
>>>>>>>>> individual TODO_ output into sub-dump-files).  I guess what would
>>>>>>>>> be nice instread would be a fancy dump-file viewer that could
>>>>>>>>> show diffs, hide things like SCEV output, etc.
>>>>>>>>>
>>>>>>>>> I suppose a patch that removes the dump TODO and unconditionally
>>>>>>>>> dumps at the current point would be a good preparation for this
>>>>>>>>> enhancing patch.
>>>>>>>>>
>>>>>>>>> Richard.
>>>>>>>>>
>>>>>>>>>> The default is 'finish'.
>>>>>>>>>>
>>>>>>>>>> Does it look ok?
>>>>>>>>>>
>>>>>>>>>> Thanks,
>>>>>>>>>>
>>>>>>>>>> David
>>>>>>>>>>
>>>>>>>>>> On Tue, Jun 7, 2011 at 2:36 AM, Richard Guenther
>>>>>>>>>> <richard.guenther@gmail.com> wrote:
>>>>>>>>>>> On Mon, Jun 6, 2011 at 6:20 PM, Xinliang David Li <davidxl@google.com> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Your patch doesn't really improve this but adds to the confusion.
>>>>>>>>>>>>>
>>>>>>>>>>>>> +  /* Override dump TODOs.  */
>>>>>>>>>>>>> +  if (dump_file && (pass->todo_flags_finish & TODO_dump_func)
>>>>>>>>>>>>> +      && (dump_flags & TDF_BEFORE))
>>>>>>>>>>>>> +    {
>>>>>>>>>>>>> +      pass->todo_flags_finish &= ~TODO_dump_func;
>>>>>>>>>>>>> +      pass->todo_flags_start |= TODO_dump_func;
>>>>>>>>>>>>> +    }
>>>>>>>>>>>>>
>>>>>>>>>>>>> and certainly writing to pass is not ok.  And the TDF_BEFORE flag
>>>>>>>>>>>>> looks misplaced as it controls TODOs, not dumping behavior.
>>>>>>>>>>>>> Yes, it's a mess right now but the above looks like a hack ontop
>>>>>>>>>>>>> of that mess (maybe because of it, but well ...).
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> How about removing dumping TODO completely -- this can be done easily
>>>>>>>>>>>> -- I don't understand why pass wants extra control on the dumping if
>>>>>>>>>>>> user already asked for dumping -- it is annoying to see empty IR dump
>>>>>>>>>>>> for a pass when I want to see it.
>>>>>>>>>>>>
>>>>>>>>>>>>> At least I would have expected to also get the dump after the
>>>>>>>>>>>>> pass, not only the one before it with this dump flag.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Now, why can't you look at the previous pass output for the
>>>>>>>>>>>>> before-dump (as I do usually)?
>>>>>>>>>>>>
>>>>>>>>>>>> For one thing, you need to either remember what is the previous pass,
>>>>>>>>>>>> or dump all passes which for large files can take very long time. Even
>>>>>>>>>>>> with all the dumps, you will need to eyeballing to find the previous
>>>>>>>>>>>> pass which may or may not have the IR dumped.
>>>>>>>>>>>>
>>>>>>>>>>>> How about removing dump TODO?
>>>>>>>>>>>
>>>>>>>>>>> Yeah, I think this would go in the right direction.  Currently some passes
>>>>>>>>>>> do not dump function bodies because they presumably do no IL
>>>>>>>>>>> modification.  But this is certainly the minority (and some passes do not
>>>>>>>>>>> dump bodies even though they are modifying the IL ...).
>>>>>>>>>>>
>>>>>>>>>>> So I'd say we should by default dump function bodies.
>>>>>>>>>>>
>>>>>>>>>>> Note that there are three useful dumping positions (maybe four),
>>>>>>>>>>> before todo-start, after todo-start, before todo-finish and after todo-finish.
>>>>>>>>>>> By default we'd want after todo-finish.  When we no longer dump via
>>>>>>>>>>> a TODO then we could indeed use dump-flags to control this
>>>>>>>>>>> (maybe -original for the body before todo-start).
>>>>>>>>>>>
>>>>>>>>>>> What to others think?
>>>>>>>>>>>
>>>>>>>>>>> Richard.
>>>>>>>>>>>
>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>
>>>>>>>>>>>> David
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Richard.
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>



More information about the Gcc-patches mailing list