[PATCH 2/5] Get bounds for a PARM_DECL (PR ipa/79761).

[Richard Biener]

On Thu, Mar 2, 2017 at 6:06 PM, marxin <mliska@suse.cz> wrote:
> gcc/ChangeLog:
>
> 2017-03-06  Martin Liska  <mliska@suse.cz>
>
>         PR ipa/79761
>         * tree-chkp.c (chkp_get_bound_for_parm): Get bounds for a param.
>         (chkp_find_bounds_1): Remove gcc_unreachable.
>
> gcc/testsuite/ChangeLog:
>
> 2017-03-06  Martin Liska  <mliska@suse.cz>
>
>         PR ipa/79761
>         * g++.dg/pr79761.C: New test.
> ---
>  gcc/testsuite/g++.dg/pr79761.C | 34 ++++++++++++++++++++++++++++++++++
>  gcc/tree-chkp.c                |  3 +--
>  2 files changed, 35 insertions(+), 2 deletions(-)
>  create mode 100644 gcc/testsuite/g++.dg/pr79761.C
>
> diff --git a/gcc/testsuite/g++.dg/pr79761.C b/gcc/testsuite/g++.dg/pr79761.C
> new file mode 100644
> index 00000000000..b1f92d2b036
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/pr79761.C
> @@ -0,0 +1,34 @@
> +/* { dg-do compile { target { ! x32 } } } */
> +/* { dg-options "-fcheck-pointer-bounds -mmpx -mabi=ms" } */
> +
> +struct Foo
> +{
> +  Foo() : a(1), b(1), c('a') {}
> +  int a;
> +  int b;
> +  char c;
> +};
> +
> +static Foo copy_foo(Foo) __attribute__((noinline, noclone));
> +
> +static Foo copy_foo(Foo A)
> +{
> +  return A;
> +}
> +
> +struct Bar : Foo
> +{
> +  Bar(Foo t) : Foo(copy_foo(t)) {}
> +};
> +
> +Foo F;
> +
> +int main (void)
> +{
> +  Bar B (F);
> +
> +  if (B.a != 1 || B.b != 1 || B.c != 'a')
> +    __builtin_abort ();
> +
> +  return 0;
> +}
> diff --git a/gcc/tree-chkp.c b/gcc/tree-chkp.c
> index 3d497f51ed8..d5683b1b9cf 100644
> --- a/gcc/tree-chkp.c
> +++ b/gcc/tree-chkp.c
> @@ -2353,7 +2353,7 @@ chkp_get_next_bounds_parm (tree parm)
>  static tree
>  chkp_get_bound_for_parm (tree parm)
>  {
> -  tree decl = SSA_NAME_VAR (parm);
> +  tree decl = TREE_CODE (parm) == PARM_DECL ? parm : SSA_NAME_VAR (parm);
>    tree bounds;
>
>    gcc_assert (TREE_CODE (decl) == PARM_DECL);
> @@ -3602,7 +3602,6 @@ chkp_find_bounds_1 (tree ptr, tree ptr_src, gimple_stmt_iterator *iter)
>        break;
>
>      case PARM_DECL:
> -      gcc_unreachable ();
>        bounds = chkp_get_bound_for_parm (ptr_src);

But this is just useless work ... just do

      case PARM_DECL:
         /* Handled above but failed.  */
         break;

the SSA_NAME case is similarly redundantly calling chkp_get_registered_bounds.

Richard.

>        break;
>
> --
> 2.11.1
>
>