On Sun, Jul 28, 2024 at 4:16 PM Alejandro Colomar <a...@kernel.org> wrote:
>
> There were two identical definitions, and none of them are available
> where they are needed for implementing _Lengthof(). Merge them, and
> provide the single definition in gcc/tree.{h,cc}, where it's available
> for _Lengthof().
>
> Signed-off-by: Alejandro Colomar <a...@kernel.org>
> ---
> gcc/cp/cp-tree.h | 1 -
> gcc/cp/tree.cc | 13 -------------
> gcc/rust/backend/rust-tree.cc | 13 -------------
> gcc/rust/backend/rust-tree.h | 2 --
> gcc/tree.cc | 13 +++++++++++++
> gcc/tree.h | 1 +
> 6 files changed, 14 insertions(+), 29 deletions(-)
>
> diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
> index c1a371bc721..e6c1c63f872 100644
> --- a/gcc/cp/cp-tree.h
> +++ b/gcc/cp/cp-tree.h
> @@ -8099,7 +8099,6 @@ extern tree build_exception_variant
> (tree, tree);
> extern void fixup_deferred_exception_variants (tree, tree);
> extern tree bind_template_template_parm (tree, tree);
> extern tree array_type_nelts_total (tree);
> -extern tree array_type_nelts_top (tree);
> extern bool array_of_unknown_bound_p (const_tree);
> extern tree break_out_target_exprs (tree, bool = false);
> extern tree build_ctor_subob_ref (tree, tree, tree);
> diff --git a/gcc/cp/tree.cc b/gcc/cp/tree.cc
> index dfd4a3a948b..1f3ecff1a21 100644
> --- a/gcc/cp/tree.cc
> +++ b/gcc/cp/tree.cc
> @@ -3071,19 +3071,6 @@ cxx_print_statistics (void)
> depth_reached);
> }
>
> -/* Return, as an INTEGER_CST node, the number of elements for TYPE
> - (which is an ARRAY_TYPE). This counts only elements of the top
> - array. */
> -
> -tree
> -array_type_nelts_top (tree type)
> -{
> - return fold_build2_loc (input_location,
> - PLUS_EXPR, sizetype,
> - array_type_nelts (type),
> - size_one_node);
> -}
> -
> /* Return, as an INTEGER_CST node, the number of elements for TYPE
> (which is an ARRAY_TYPE). This one is a recursive count of all
> ARRAY_TYPEs that are clumped together. */
> diff --git a/gcc/rust/backend/rust-tree.cc b/gcc/rust/backend/rust-tree.cc
> index 2a5ffcbf895..dd8eda84f9b 100644
> --- a/gcc/rust/backend/rust-tree.cc
> +++ b/gcc/rust/backend/rust-tree.cc
> @@ -859,19 +859,6 @@ is_empty_class (tree type)
> return CLASSTYPE_EMPTY_P (type);
> }
>
> -// forked from gcc/cp/tree.cc array_type_nelts_top
> -
> -/* Return, as an INTEGER_CST node, the number of elements for TYPE
> - (which is an ARRAY_TYPE). This counts only elements of the top
> - array. */
> -
> -tree
> -array_type_nelts_top (tree type)
> -{
> - return fold_build2_loc (input_location, PLUS_EXPR, sizetype,
> - array_type_nelts (type), size_one_node);
> -}
> -
> // forked from gcc/cp/tree.cc builtin_valid_in_constant_expr_p
>
> /* Test whether DECL is a builtin that may appear in a
> diff --git a/gcc/rust/backend/rust-tree.h b/gcc/rust/backend/rust-tree.h
> index 26c8b653ac6..e597c3ab81d 100644
> --- a/gcc/rust/backend/rust-tree.h
> +++ b/gcc/rust/backend/rust-tree.h
> @@ -2993,8 +2993,6 @@ extern location_t rs_expr_location (const_tree);
> extern int
> is_empty_class (tree type);
>
> -extern tree array_type_nelts_top (tree);
> -
> extern bool
> is_really_empty_class (tree, bool);
>
> diff --git a/gcc/tree.cc b/gcc/tree.cc
> index 2d2d5b6db6e..3b0adb4cd9f 100644
> --- a/gcc/tree.cc
> +++ b/gcc/tree.cc
> @@ -3729,6 +3729,19 @@ array_type_nelts (const_tree type)
> ? max
> : fold_build2 (MINUS_EXPR, TREE_TYPE (max), max, min));
> }
> +
> +/* Return, as an INTEGER_CST node, the number of elements for TYPE
> + (which is an ARRAY_TYPE). This counts only elements of the top
> + array. */
> +
> +tree
> +array_type_nelts_top (tree type)
> +{
> + return fold_build2_loc (input_location,
> + PLUS_EXPR, sizetype,
> + array_type_nelts (type),
> + size_one_node);
> +}
But this is now extremely confusing API with array_type_nelts above this
saying
/* Return, as a tree node, the number of elements for TYPE (which is an
ARRAY_TYPE) minus one. This counts only elements of the top array. */
so both are "_top". And there's build_array_type_nelts that's taking
the number of elements.
Can you please rename the existing array_type_nelts to
array_type_nelts_minus_one? Then _top could be dropped as well from
the alternate API you add.
I'll also note since array_type_nelts_top calls the other function and that has
/* If they did it with unspecified bounds, then we should have already
given an error about it before we got here. */
if (! TYPE_DOMAIN (type))
return error_mark_node;
the function should handle error_mark_node (and pass that down).
Note array_type_nelts returns nelts - 1 because that avoids building
a new tree node for arrays with lower bound zero.
Thanks,
Richard.
> /* If arg is static -- a reference to an object in static storage -- then
> return the object. This is not the same as the C meaning of `static'.
> diff --git a/gcc/tree.h b/gcc/tree.h
> index 28e8e71b036..c620e55b68d 100644
> --- a/gcc/tree.h
> +++ b/gcc/tree.h
> @@ -4922,6 +4922,7 @@ extern tree build_method_type (tree, tree);
> extern tree build_offset_type (tree, tree);
> extern tree build_complex_type (tree, bool named = false);
> extern tree array_type_nelts (const_tree);
> +extern tree array_type_nelts_top (tree);
>
> extern tree value_member (tree, tree);
> extern tree purpose_member (const_tree, tree);
> --
> 2.45.2
>
