This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Where does tree-ssa.c read the variable names for -Wuninitialized messages?
- From: Diego Novillo <dnovillo at redhat dot com>
- To: François-Xavier Coudert <fxcoudert at gmail dot com>
- Cc: GCC Development <gcc at gcc dot gnu dot org>, gfortran <fortran at gcc dot gnu dot org>
- Date: Mon, 25 Sep 2006 08:44:49 -0400
- Subject: Re: Where does tree-ssa.c read the variable names for -Wuninitialized messages?
- References: <19c433eb0609250535g7d163503k71edf12266662262@mail.gmail.com>
François-Xavier Coudert wrote on 09/25/06 08:35:
> Hi,
>
> I'm trying to understand PR 13615, where a used-uninitialized Fortran
> character string induces the following diagnostic:
>
> 'c[1]{lb: 1 sz: 1}t.f: In function 'warn_character':
> t.f:33: warning: ' is used uninitialized in this function
>
> I see that this error message is emitted from tree-ssa.c, but I'm not
> skilled enough in middle-end magic to understand whether the fault is
> on the front-end not setting something correctly, or the middle-end
> not understanding what this variable is. I hope someone here could,
> without too much trouble, help me.
>
The analysis is done over SSA names. The variable name is taken from
SSA_NAME_VAR, which is a _DECL that had been gathered during the initial
into SSA phase (find_referenced_vars and rewrite_into_ssa).
I'd say the FE is not setting the name properly into whatever _DECL we
found.
Set a breakpoint at the end of tree-ssa.c:warn_uninit to examine the
_DECL node.