Re: [PATCH 2/5] Existing call graph infrastructure enhancement

[Jan Hubicka <hubicka@ucw.cz>]

> Hello,
>    after fixing an issue with callgraph thunk creation, I would like to enhance callgraph API a bit. My problem was that I was trying to expand_thunk after a body of the original function was removed. As a result, I created a call without arguments. The change was suggested by Honza.
> 
> Thank you,
> Martin
> 
> On 07/17/2014 03:49 PM, Martin Liška wrote:
> >
> >On 06/30/2014 08:54 PM, Jeff Law wrote:
> >>On 06/30/14 05:49, Martin Liška wrote:
> >>>
> >>>On 06/17/2014 10:00 PM, Jeff Law wrote:
> >>>>On 06/13/14 04:26, mliska wrote:
> >>>>>Hi,
> >>>>>     this small patch prepares remaining needed infrastructure for
> >>>>>the new pass.
> >>>>>
> >>>>>Changelog:
> >>>>>
> >>>>>2014-06-13  Martin Liska  <mliska@suse.cz>
> >>>>>        Honza Hubicka  <hubicka@ucw.cz>
> >>>>>
> >>>>>    * ipa-utils.h (polymorphic_type_binfo_p): Function marked external
> >>>>>    instead of static.
> >>>>>    * ipa-devirt.c (polymorphic_type_binfo_p): Likewise.
> >>>>>    * ipa-prop.h (count_formal_params): Likewise.
> >>>>>    * ipa-prop.c (count_formal_params): Likewise.
> >>>>>    * ipa-utils.c (ipa_merge_profiles): Be more tolerant if we merge
> >>>>>    profiles for semantically equivalent functions.
> >>>>>    * passes.c (do_per_function): If we load body of a function
> >>>>>during WPA,
> >>>>>    this condition should behave same.
> >>>>>    * varpool.c (ctor_for_folding): More tolerant assert for variable
> >>>>>    aliases created during WPA.
> >>>>Presumably we don't have any useful way to merge the cases where we
> >>>>have provides for SRC & DST in ipa_merge_profiles or even to guess
> >>>>which is more useful when presented with both?  Does it make sense to
> >>>>log this into a debugging file when we drop one?
> >>>Hello,
> >>>    this merge function was written by Honza, what do you think Honza
> >>>about this note?
> >>>
> >>>>I think this patch is fine.  If adding logging makes sense, then feel
> >>>>free to do so and consider that trivial change pre-approved.
> >>>I made a small change to this patch, where I moved
> >>>'gsi_next_nonvirtual_phi' from the pass to gimple-iterator.h.
> >>>
> >>>Ready for trunk with this change?
> >>Yes.  I think with the exception of patch #3/5 everything looks good. I'll try to get another pass over #3 this week.  What I looked at last week was pretty good; I'm pretty confident this will be wrapped up shortly.
> >>
> >>If #1/#2 make sense to install independent of #3, go ahead. #4/#5 are obviously dependent on #3.
> >>
> >>Jeff
> >
> >Hello,
> >   thank you for approval, this final version removes few hunks that are not needed any more. Changes are just cosmetic and I will commit the patch at the beginning of next week.
> >
> >Thanks,
> >Martin
> >
> 

> 2014-08-25  Martin Liska  <mliska@suse.cz>
> 
> 	* cgraph.h (release_body):  new argument keep_arguments added.
> 	* cgraph.c (release_body): Likewise.

OK,
thanks!
Honza

> diff --git a/gcc/cgraph.c b/gcc/cgraph.c
> index cb49cdc..ad32fb8 100644
> --- a/gcc/cgraph.c
> +++ b/gcc/cgraph.c
> @@ -1716,13 +1716,15 @@ release_function_body (tree decl)
>     are free'd in final.c via free_after_compilation().  */
>  
>  void
> -cgraph_node::release_body (void)
> +cgraph_node::release_body (bool keep_arguments)
>  {
>    ipa_transforms_to_apply.release ();
>    if (!used_as_abstract_origin && cgraph_state != CGRAPH_STATE_PARSING)
>      {
>        DECL_RESULT (decl) = NULL;
> -      DECL_ARGUMENTS (decl) = NULL;
> +
> +      if (!keep_arguments)
> +       DECL_ARGUMENTS (decl) = NULL;
>      }
>    /* If the node is abstract and needed, then do not clear DECL_INITIAL
>       of its associated function function declaration because it's
> diff --git a/gcc/cgraph.h b/gcc/cgraph.h
> index 2594ae5..5edcf74 100644
> --- a/gcc/cgraph.h
> +++ b/gcc/cgraph.h
> @@ -890,7 +890,7 @@ public:
>       Use this only for functions that are released before being translated to
>       target code (i.e. RTL).  Functions that are compiled to RTL and beyond
>       are free'd in final.c via free_after_compilation().  */
> -  void release_body (void);
> +  void release_body (bool keep_arguments = false);
>  
>    /* cgraph_node is no longer nested function; update cgraph accordingly.  */
>    void unnest (void);