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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/99826] New: GIMPLE FE fails to grok pointer declarators
Date: Tue, 30 Mar 2021 09:58:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99826

            Bug ID: 99826
           Summary: GIMPLE FE fails to grok pointer declarators
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

char * __GIMPLE(ssa) foo(char *p)
{
  char *_2;

__BB(2):
  _2 =3D p_1(D);
  return _2;
}

shows two issues, first the return type declaration causes __GIMPLE to be
not associated with the function, failing it to parse at all.  Fixing that
using a typedef shows that we fail to parse the SSA declaration 'char *_2'
as SSA name declaration because we have

      /* Handle SSA name decls specially, they do not go into the identifier
         table but we simply build the SSA name for later lookup.  */
      unsigned version, ver_offset;
      if (declarator->kind =3D=3D cdk_id
          && is_gimple_reg_type (specs->type)

but declarator is

$5 =3D {kind =3D cdk_pointer, id_loc =3D 0, declarator =3D 0x3775200, u =3D=
 {id =3D {
      id =3D <tree 0x0>, attrs =3D <tree 0x0>}, arg_info =3D 0x0, array =3D=
 {
      dimen =3D <tree 0x0>, quals =3D 0, attrs =3D <tree 0x0>, static_p =3D=
 0,=20
      vla_unspec_p =3D 0}, pointer_quals =3D 0, attrs =3D <tree 0x0>}}

in this case.  It looks like we need to unwrap cdk_pointer at least
(and build the actual pointer type in the SSA case).  The "early-out"
case for SSA names tries to avoid start_decl and building a decl
(and registering it in the binding for future lookup).=