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Remove rustc_allow_const_fn_ptr
This was a hack to work around the lack of an escape hatch for the "min `const fn`" checks in const-stable functions. Now that we have co-opted `allow_internal_unstable` for this purpose, we no longer need the bespoke attribute.
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@ -145,8 +145,6 @@ pub struct ConstStability {
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pub feature: Symbol,
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/// whether the function has a `#[rustc_promotable]` attribute
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pub promotable: bool,
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/// whether the function has a `#[rustc_allow_const_fn_ptr]` attribute
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pub allow_const_fn_ptr: bool,
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}
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/// The available stability levels.
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@ -190,7 +188,6 @@ where
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let mut stab: Option<Stability> = None;
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let mut const_stab: Option<ConstStability> = None;
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let mut promotable = false;
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let mut allow_const_fn_ptr = false;
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let diagnostic = &sess.parse_sess.span_diagnostic;
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'outer: for attr in attrs_iter {
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@ -200,7 +197,6 @@ where
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sym::unstable,
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sym::stable,
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sym::rustc_promotable,
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sym::rustc_allow_const_fn_ptr,
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]
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.iter()
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.any(|&s| attr.has_name(s))
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@ -215,9 +211,6 @@ where
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if attr.has_name(sym::rustc_promotable) {
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promotable = true;
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}
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if attr.has_name(sym::rustc_allow_const_fn_ptr) {
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allow_const_fn_ptr = true;
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}
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// attributes with data
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else if let Some(MetaItem { kind: MetaItemKind::List(ref metas), .. }) = meta {
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let meta = meta.as_ref().unwrap();
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@ -360,12 +353,8 @@ where
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if sym::unstable == meta_name {
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stab = Some(Stability { level, feature });
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} else {
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const_stab = Some(ConstStability {
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level,
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feature,
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promotable: false,
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allow_const_fn_ptr: false,
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});
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const_stab =
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Some(ConstStability { level, feature, promotable: false });
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}
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}
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(None, _, _) => {
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@ -440,12 +429,8 @@ where
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if sym::stable == meta_name {
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stab = Some(Stability { level, feature });
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} else {
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const_stab = Some(ConstStability {
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level,
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feature,
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promotable: false,
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allow_const_fn_ptr: false,
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});
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const_stab =
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Some(ConstStability { level, feature, promotable: false });
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}
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}
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(None, _) => {
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@ -464,18 +449,16 @@ where
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}
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// Merge the const-unstable info into the stability info
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if promotable || allow_const_fn_ptr {
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if promotable {
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if let Some(ref mut stab) = const_stab {
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stab.promotable = promotable;
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stab.allow_const_fn_ptr = allow_const_fn_ptr;
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} else {
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struct_span_err!(
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diagnostic,
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item_sp,
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E0717,
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"rustc_promotable and rustc_allow_const_fn_ptr attributes \
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must be paired with either a rustc_const_unstable or a rustc_const_stable \
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attribute"
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"`rustc_promotable` attribute must be paired with either a `rustc_const_unstable` \
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or a `rustc_const_stable` attribute"
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)
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.emit();
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}
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@ -464,7 +464,6 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
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// ==========================================================================
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rustc_attr!(rustc_promotable, AssumedUsed, template!(Word), IMPL_DETAIL),
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rustc_attr!(rustc_allow_const_fn_ptr, AssumedUsed, template!(Word), IMPL_DETAIL),
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rustc_attr!(rustc_args_required_const, AssumedUsed, template!(List: "N"), INTERNAL_UNSTABLE),
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// ==========================================================================
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@ -457,10 +457,6 @@ rustc_queries! {
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desc { |tcx| "checking if item is promotable: `{}`", tcx.def_path_str(key) }
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}
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query const_fn_is_allowed_fn_ptr(key: DefId) -> bool {
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desc { |tcx| "checking if const fn allows `fn()` types: `{}`", tcx.def_path_str(key) }
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}
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/// Returns `true` if this is a foreign item (i.e., linked via `extern { ... }`).
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query is_foreign_item(key: DefId) -> bool {
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desc { |tcx| "checking if `{}` is a foreign item", tcx.def_path_str(key) }
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@ -151,17 +151,11 @@ fn is_promotable_const_fn(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
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}
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}
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fn const_fn_is_allowed_fn_ptr(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
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is_const_fn(tcx, def_id)
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&& tcx.lookup_const_stability(def_id).map(|stab| stab.allow_const_fn_ptr).unwrap_or(false)
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}
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pub fn provide(providers: &mut Providers) {
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*providers = Providers {
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is_const_fn_raw,
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is_const_impl_raw: |tcx, def_id| is_const_impl_raw(tcx, def_id.expect_local()),
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is_promotable_const_fn,
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const_fn_is_allowed_fn_ptr,
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..*providers
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};
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}
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@ -885,7 +885,6 @@ symbols! {
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rustc,
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rustc_allocator,
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rustc_allocator_nounwind,
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rustc_allow_const_fn_ptr,
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rustc_args_required_const,
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rustc_attrs,
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rustc_builtin_macro,
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@ -129,14 +129,9 @@ impl RawWakerVTable {
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/// associated task.
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#[rustc_promotable]
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#[stable(feature = "futures_api", since = "1.36.0")]
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// `rustc_allow_const_fn_ptr` is a hack that should not be used anywhere else
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// without first consulting with T-Lang.
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//
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// FIXME: remove whenever we have a stable way to accept fn pointers from const fn
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// (see https://github.com/rust-rfcs/const-eval/issues/19#issuecomment-472799062)
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#[rustc_allow_const_fn_ptr]
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#[rustc_const_stable(feature = "futures_api", since = "1.36.0")]
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#[cfg_attr(not(bootstrap), allow_internal_unstable(const_fn_fn_ptr_basics))]
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#[cfg_attr(bootstrap, rustc_allow_const_fn_ptr)]
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pub const fn new(
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clone: unsafe fn(*const ()) -> RawWaker,
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wake: unsafe fn(*const ()),
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