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Re: Adding an IPA pass question (pass names)

On Wed, 2015-08-19 at 10:27 -0700, Steve Ellcey wrote:
> I am trying to create a new IPA pass to scan the routines being compiled
> by GCC and I thought I would put it in after the last IPA pass (comdats)
> so I tried to register it with:
>   opt_pass *p = make_pass_ipa_frame_header_opt (g);
>   static struct register_pass_info f = 
> 	{p, "comdats", 1, PASS_POS_INSERT_AFTER };
>   register_pass (&f);
> But when I build GCC I get:
> /scratch/sellcey/repos/header2/src/gcc/libgcc/libgcc2.c:1:0: fatal error: pass 'comdats' not found but is referenced by new pass 'frame-header-opt'
> Does anyone know why this is the case?  "comdats" is what is used for
> the name of pass_ipa_comdats in ipa-comdats.c.

Is your pass of the correct type?  (presumably IPA_PASS).  I've run into
this a few times with custom passes (which seems to be a "gotcha");
position_pass can fail here:

      /* Check if the current pass is of the same type as the new pass and
         matches the name and the instance number of the reference pass.  */
      if (pass->type == new_pass_info->pass->type

Hope this is helpful

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