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Auto merge of #133234 - jhpratt:rollup-42dmg4p, r=jhpratt

Browse Source 
Rollup of 5 pull requests

Successful merges:

 - #132732 (Use attributes for `dangling_pointers_from_temporaries` lint)
 - #133108 (lints_that_dont_need_to_run: never skip future-compat-reported lints)
 - #133190 (CI: use free runner in dist-aarch64-msvc)
 - #133196 (Make rustc --explain compatible with BusyBox less)
 - #133216 (Implement `~const Fn` trait goal in the new solver)

r? `@ghost`
`@rustbot` modify labels: rollup
This commit is contained in:
bors 2024-11-20 09:27:56 +00:00
commit fda6892747
29 changed files with 305 additions and 159 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
compiler/rustc_driver_impl/src/lib.rs
View File

@ -577,7 +577,7 @@ fn show_md_content_with_pager(content: &str, color: ColorConfig) {
let mut cmd = Command::new(&pager_name);
// FIXME: find if other pagers accept color options
let mut print_formatted = if pager_name == "less" {
cmd.arg("-r");
cmd.arg("-R");
true
} else {
["bat", "catbat", "delta"].iter().any(|v| *v == pager_name)

5
compiler/rustc_feature/src/builtin_attrs.rs
View File

@ -879,6 +879,11 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
lang, Normal, template!(NameValueStr: "name"), DuplicatesOk, EncodeCrossCrate::No, lang_items,
"lang items are subject to change",
),
rustc_attr!(
rustc_as_ptr, Normal, template!(Word), ErrorFollowing,
EncodeCrossCrate::Yes,
"#[rustc_as_ptr] is used to mark functions returning pointers to their inner allocations."
),
rustc_attr!(
rustc_pass_by_value, Normal, template!(Word), ErrorFollowing,
EncodeCrossCrate::Yes,

27
compiler/rustc_lint/src/dangling.rs
View File

@ -43,13 +43,10 @@ declare_lint! {
}
/// FIXME: false negatives (i.e. the lint is not emitted when it should be)
/// 1. Method calls that are not checked for:
/// - [`temporary_unsafe_cell.get()`][`core::cell::UnsafeCell::get()`]
/// - [`temporary_sync_unsafe_cell.get()`][`core::cell::SyncUnsafeCell::get()`]
/// 2. Ways to get a temporary that are not recognized:
/// 1. Ways to get a temporary that are not recognized:
/// - `owning_temporary.field`
/// - `owning_temporary[index]`
/// 3. No checks for ref-to-ptr conversions:
/// 2. No checks for ref-to-ptr conversions:
/// - `&raw [mut] temporary`
/// - `&temporary as *(const|mut) _`
/// - `ptr::from_ref(&temporary)` and friends
@ -133,10 +130,11 @@ impl DanglingPointerSearcher<'_, '_> {
fn lint_expr(cx: &LateContext<'_>, expr: &Expr<'_>) {
if let ExprKind::MethodCall(method, receiver, _args, _span) = expr.kind
&& matches!(method.ident.name, sym::as_ptr | sym::as_mut_ptr)
&& let Some(fn_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id)
&& cx.tcx.has_attr(fn_id, sym::rustc_as_ptr)
&& is_temporary_rvalue(receiver)
&& let ty = cx.typeck_results().expr_ty(receiver)
&& is_interesting(cx.tcx, ty)
&& owns_allocation(cx.tcx, ty)
{
// FIXME: use `emit_node_lint` when `#[primary_span]` is added.
cx.tcx.emit_node_span_lint(
@ -199,24 +197,25 @@ fn is_temporary_rvalue(expr: &Expr<'_>) -> bool {
}
}
// Array, Vec, String, CString, MaybeUninit, Cell, Box<[_]>, Box<str>, Box<CStr>,
// or any of the above in arbitrary many nested Box'es.
fn is_interesting(tcx: TyCtxt<'_>, ty: Ty<'_>) -> bool {
// Array, Vec, String, CString, MaybeUninit, Cell, Box<[_]>, Box<str>, Box<CStr>, UnsafeCell,
// SyncUnsafeCell, or any of the above in arbitrary many nested Box'es.
fn owns_allocation(tcx: TyCtxt<'_>, ty: Ty<'_>) -> bool {
if ty.is_array() {
true
} else if let Some(inner) = ty.boxed_ty() {
inner.is_slice()
|| inner.is_str()
|| inner.ty_adt_def().is_some_and(|def| tcx.is_lang_item(def.did(), LangItem::CStr))
|| is_interesting(tcx, inner)
|| owns_allocation(tcx, inner)
} else if let Some(def) = ty.ty_adt_def() {
for lang_item in [LangItem::String, LangItem::MaybeUninit] {
for lang_item in [LangItem::String, LangItem::MaybeUninit, LangItem::UnsafeCell] {
if tcx.is_lang_item(def.did(), lang_item) {
return true;
}
}
tcx.get_diagnostic_name(def.did())
.is_some_and(|name| matches!(name, sym::cstring_type | sym::Vec | sym::Cell))
tcx.get_diagnostic_name(def.did()).is_some_and(|name| {
matches!(name, sym::cstring_type | sym::Vec | sym::Cell | sym::SyncUnsafeCell)
})
} else {
false
}

22
compiler/rustc_lint/src/levels.rs
View File

@ -123,17 +123,19 @@ fn lints_that_dont_need_to_run(tcx: TyCtxt<'_>, (): ()) -> FxIndexSet<LintId> {
let dont_need_to_run: FxIndexSet<LintId> = store
.get_lints()
.into_iter()
.filter(|lint| {
// Lints that show up in future-compat reports must always be run.
let has_future_breakage =
lint.future_incompatible.is_some_and(|fut| fut.reason.has_future_breakage());
!has_future_breakage && !lint.eval_always
})
.filter_map(|lint| {
if !lint.eval_always {
let lint_level = map.lint_level_id_at_node(tcx, LintId::of(lint), CRATE_HIR_ID);
if matches!(lint_level, (Level::Allow, ..))
|| (matches!(lint_level, (.., LintLevelSource::Default)))
&& lint.default_level(tcx.sess.edition()) == Level::Allow
{
Some(LintId::of(lint))
} else {
None
}
let lint_level = map.lint_level_id_at_node(tcx, LintId::of(lint), CRATE_HIR_ID);
if matches!(lint_level, (Level::Allow, ..))
|| (matches!(lint_level, (.., LintLevelSource::Default)))
&& lint.default_level(tcx.sess.edition()) == Level::Allow
{
Some(LintId::of(lint))
} else {
None
}

14
compiler/rustc_lint_defs/src/lib.rs
View File

@ -466,6 +466,20 @@ impl FutureIncompatibilityReason {
| FutureIncompatibilityReason::Custom(_) => None,
}
}
pub fn has_future_breakage(self) -> bool {
match self {
FutureIncompatibilityReason::FutureReleaseErrorReportInDeps => true,
FutureIncompatibilityReason::FutureReleaseErrorDontReportInDeps
| FutureIncompatibilityReason::FutureReleaseSemanticsChange
| FutureIncompatibilityReason::EditionError(_)
| FutureIncompatibilityReason::EditionSemanticsChange(_)
| FutureIncompatibilityReason::EditionAndFutureReleaseError(_)
| FutureIncompatibilityReason::EditionAndFutureReleaseSemanticsChange(_)
| FutureIncompatibilityReason::Custom(_) => false,
}
}
}
impl FutureIncompatibleInfo {

7
compiler/rustc_middle/src/lint.rs
View File

@ -290,12 +290,7 @@ pub fn lint_level(
let has_future_breakage = future_incompatible.map_or(
// Default allow lints trigger too often for testing.
sess.opts.unstable_opts.future_incompat_test && lint.default_level != Level::Allow,
|incompat| {
matches!(
incompat.reason,
FutureIncompatibilityReason::FutureReleaseErrorReportInDeps
)
},
|incompat| incompat.reason.has_future_breakage(),
);
// Convert lint level to error level.

6
compiler/rustc_middle/src/ty/context.rs
View File

@ -376,7 +376,11 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
self.explicit_implied_predicates_of(def_id).map_bound(|preds| preds.into_iter().copied())
}
fn is_const_impl(self, def_id: DefId) -> bool {
fn impl_is_const(self, def_id: DefId) -> bool {
self.is_conditionally_const(def_id)
}
fn fn_is_const(self, def_id: DefId) -> bool {
self.is_conditionally_const(def_id)
}

70
compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs
View File

@ -633,6 +633,76 @@ fn coroutine_closure_to_ambiguous_coroutine<I: Interner>(
)
}
/// This duplicates `extract_tupled_inputs_and_output_from_callable` but needs
/// to return different information (namely, the def id and args) so that we can
/// create const conditions.
///
/// Doing so on all calls to `extract_tupled_inputs_and_output_from_callable`
/// would be wasteful.
pub(in crate::solve) fn extract_fn_def_from_const_callable<I: Interner>(
cx: I,
self_ty: I::Ty,
) -> Result<(ty::Binder<I, (I::FnInputTys, I::Ty)>, I::DefId, I::GenericArgs), NoSolution> {
match self_ty.kind() {
ty::FnDef(def_id, args) => {
let sig = cx.fn_sig(def_id);
if sig.skip_binder().is_fn_trait_compatible()
&& !cx.has_target_features(def_id)
&& cx.fn_is_const(def_id)
{
Ok((
sig.instantiate(cx, args).map_bound(|sig| (sig.inputs(), sig.output())),
def_id,
args,
))
} else {
return Err(NoSolution);
}
}
// `FnPtr`s are not const for now.
ty::FnPtr(..) => {
return Err(NoSolution);
}
// `Closure`s are not const for now.
ty::Closure(..) => {
return Err(NoSolution);
}
// `CoroutineClosure`s are not const for now.
ty::CoroutineClosure(..) => {
return Err(NoSolution);
}
ty::Bool
| ty::Char
| ty::Int(_)
| ty::Uint(_)
| ty::Float(_)
| ty::Adt(_, _)
| ty::Foreign(_)
| ty::Str
| ty::Array(_, _)
| ty::Slice(_)
| ty::RawPtr(_, _)
| ty::Ref(_, _, _)
| ty::Dynamic(_, _, _)
| ty::Coroutine(_, _)
| ty::CoroutineWitness(..)
| ty::Never
| ty::Tuple(_)
| ty::Pat(_, _)
| ty::Alias(_, _)
| ty::Param(_)
| ty::Placeholder(..)
| ty::Infer(ty::IntVar(_) | ty::FloatVar(_))
| ty::Error(_) => return Err(NoSolution),
ty::Bound(..)
| ty::Infer(ty::TyVar(_) | ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
panic!("unexpected type `{self_ty:?}`")
}
}
}
/// Assemble a list of predicates that would be present on a theoretical
/// user impl for an object type. These predicates must be checked any time
/// we assemble a built-in object candidate for an object type, since they

55
compiler/rustc_next_trait_solver/src/solve/effect_goals.rs
View File

@ -3,15 +3,15 @@
use rustc_type_ir::fast_reject::DeepRejectCtxt;
use rustc_type_ir::inherent::*;
use rustc_type_ir::lang_items::TraitSolverLangItem;
use rustc_type_ir::{self as ty, Interner, elaborate};
use tracing::instrument;
use super::assembly::Candidate;
use super::assembly::{Candidate, structural_traits};
use crate::delegate::SolverDelegate;
use crate::solve::assembly::{self};
use crate::solve::{
BuiltinImplSource, CandidateSource, Certainty, EvalCtxt, Goal, GoalSource, NoSolution,
QueryResult,
QueryResult, assembly,
};
impl<D, I> assembly::GoalKind<D> for ty::HostEffectPredicate<I>
@ -142,7 +142,7 @@ where
ty::ImplPolarity::Positive => {}
};
if !cx.is_const_impl(impl_def_id) {
if !cx.impl_is_const(impl_def_id) {
return Err(NoSolution);
}
@ -207,7 +207,7 @@ where
_ecx: &mut EvalCtxt<'_, D>,
_goal: Goal<I, Self>,
) -> Result<Candidate<I>, NoSolution> {
todo!("Copy/Clone is not yet const")
Err(NoSolution)
}
fn consider_builtin_pointer_like_candidate(
@ -225,11 +225,48 @@ where
}
fn consider_builtin_fn_trait_candidates(
_ecx: &mut EvalCtxt<'_, D>,
_goal: Goal<I, Self>,
ecx: &mut EvalCtxt<'_, D>,
goal: Goal<I, Self>,
_kind: rustc_type_ir::ClosureKind,
) -> Result<Candidate<I>, NoSolution> {
todo!("Fn* are not yet const")
let cx = ecx.cx();
let self_ty = goal.predicate.self_ty();
let (inputs_and_output, def_id, args) =
structural_traits::extract_fn_def_from_const_callable(cx, self_ty)?;
// A built-in `Fn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
let output_is_sized_pred = inputs_and_output.map_bound(|(_, output)| {
ty::TraitRef::new(cx, cx.require_lang_item(TraitSolverLangItem::Sized), [output])
});
let requirements = cx
.const_conditions(def_id)
.iter_instantiated(cx, args)
.map(|trait_ref| {
(
GoalSource::ImplWhereBound,
goal.with(cx, trait_ref.to_host_effect_clause(cx, goal.predicate.constness)),
)
})
.chain([(GoalSource::ImplWhereBound, goal.with(cx, output_is_sized_pred))]);
let pred = inputs_and_output
.map_bound(|(inputs, _)| {
ty::TraitRef::new(cx, goal.predicate.def_id(), [
goal.predicate.self_ty(),
Ty::new_tup(cx, inputs.as_slice()),
])
})
.to_host_effect_clause(cx, goal.predicate.constness);
Self::probe_and_consider_implied_clause(
ecx,
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),
goal,
pred,
requirements,
)
}
fn consider_builtin_async_fn_trait_candidates(
@ -314,7 +351,7 @@ where
_ecx: &mut EvalCtxt<'_, D>,
_goal: Goal<I, Self>,
) -> Result<Candidate<I>, NoSolution> {
unreachable!("Destruct is not const")
Err(NoSolution)
}
fn consider_builtin_transmute_candidate(

10
compiler/rustc_next_trait_solver/src/solve/normalizes_to/mod.rs
View File

@ -394,6 +394,9 @@ where
return ecx.forced_ambiguity(MaybeCause::Ambiguity);
}
};
// A built-in `Fn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
let output_is_sized_pred = tupled_inputs_and_output.map_bound(|(_, output)| {
ty::TraitRef::new(cx, cx.require_lang_item(TraitSolverLangItem::Sized), [output])
});
@ -408,8 +411,6 @@ where
})
.upcast(cx);
// A built-in `Fn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
Self::probe_and_consider_implied_clause(
ecx,
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),
@ -438,6 +439,9 @@ where
goal_kind,
env_region,
)?;
// A built-in `AsyncFn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
let output_is_sized_pred = tupled_inputs_and_output_and_coroutine.map_bound(
|AsyncCallableRelevantTypes { output_coroutine_ty: output_ty, .. }| {
ty::TraitRef::new(cx, cx.require_lang_item(TraitSolverLangItem::Sized), [output_ty])
@ -494,8 +498,6 @@ where
)
.upcast(cx);
// A built-in `AsyncFn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
Self::probe_and_consider_implied_clause(
ecx,
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),

10
compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
View File

@ -326,6 +326,9 @@ where
return ecx.forced_ambiguity(MaybeCause::Ambiguity);
}
};
// A built-in `Fn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
let output_is_sized_pred = tupled_inputs_and_output.map_bound(|(_, output)| {
ty::TraitRef::new(cx, cx.require_lang_item(TraitSolverLangItem::Sized), [output])
});
@ -335,8 +338,6 @@ where
ty::TraitRef::new(cx, goal.predicate.def_id(), [goal.predicate.self_ty(), inputs])
})
.upcast(cx);
// A built-in `Fn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
Self::probe_and_consider_implied_clause(
ecx,
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),
@ -364,6 +365,9 @@ where
// This region doesn't matter because we're throwing away the coroutine type
Region::new_static(cx),
)?;
// A built-in `AsyncFn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
let output_is_sized_pred = tupled_inputs_and_output_and_coroutine.map_bound(
|AsyncCallableRelevantTypes { output_coroutine_ty, .. }| {
ty::TraitRef::new(cx, cx.require_lang_item(TraitSolverLangItem::Sized), [
@ -380,8 +384,6 @@ where
])
})
.upcast(cx);
// A built-in `AsyncFn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
Self::probe_and_consider_implied_clause(
ecx,
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),

3
compiler/rustc_passes/src/check_attr.rs
View File

@ -162,6 +162,9 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
self.check_rustc_std_internal_symbol(attr, span, target)
}
[sym::naked, ..] => self.check_naked(hir_id, attr, span, target, attrs),
[sym::rustc_as_ptr, ..] => {
self.check_applied_to_fn_or_method(hir_id, attr, span, target)
}
[sym::rustc_never_returns_null_ptr, ..] => {
self.check_applied_to_fn_or_method(hir_id, attr, span, target)
}

3
compiler/rustc_span/src/symbol.rs
View File

@ -316,6 +316,7 @@ symbols! {
SubdiagMessage,
Subdiagnostic,
Sync,
SyncUnsafeCell,
T,
Target,
ToOwned,
@ -409,7 +410,6 @@ symbols! {
arm,
arm_target_feature,
array,
as_mut_ptr,
as_ptr,
as_ref,
as_str,
@ -1655,6 +1655,7 @@ symbols! {
rustc_allow_const_fn_unstable,
rustc_allow_incoherent_impl,
rustc_allowed_through_unstable_modules,
rustc_as_ptr,
rustc_attrs,
rustc_autodiff,
rustc_box,

3
compiler/rustc_type_ir/src/interner.rs
View File

@ -223,7 +223,8 @@ pub trait Interner:
def_id: Self::DefId,
) -> ty::EarlyBinder<Self, impl IntoIterator<Item = (Self::Clause, Self::Span)>>;
fn is_const_impl(self, def_id: Self::DefId) -> bool;
fn impl_is_const(self, def_id: Self::DefId) -> bool;
fn fn_is_const(self, def_id: Self::DefId) -> bool;
fn const_conditions(
self,
def_id: Self::DefId,

2
library/alloc/src/boxed.rs
View File

@ -1500,6 +1500,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
/// [`as_ptr`]: Self::as_ptr
#[unstable(feature = "box_as_ptr", issue = "129090")]
#[rustc_never_returns_null_ptr]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[inline]
pub fn as_mut_ptr(b: &mut Self) -> *mut T {
// This is a primitive deref, not going through `DerefMut`, and therefore not materializing
@ -1548,6 +1549,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
/// [`as_ptr`]: Self::as_ptr
#[unstable(feature = "box_as_ptr", issue = "129090")]
#[rustc_never_returns_null_ptr]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[inline]
pub fn as_ptr(b: &Self) -> *const T {
// This is a primitive deref, not going through `DerefMut`, and therefore not materializing

2
library/alloc/src/vec/mod.rs
View File

@ -1662,6 +1662,7 @@ impl<T, A: Allocator> Vec<T, A> {
#[stable(feature = "vec_as_ptr", since = "1.37.0")]
#[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
#[rustc_never_returns_null_ptr]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[inline]
pub const fn as_ptr(&self) -> *const T {
// We shadow the slice method of the same name to avoid going through
@ -1724,6 +1725,7 @@ impl<T, A: Allocator> Vec<T, A> {
#[stable(feature = "vec_as_ptr", since = "1.37.0")]
#[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
#[rustc_never_returns_null_ptr]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[inline]
pub const fn as_mut_ptr(&mut self) -> *mut T {
// We shadow the slice method of the same name to avoid going through

5
library/core/src/cell.rs
View File

@ -587,6 +587,7 @@ impl<T: ?Sized> Cell<T> {
#[inline]
#[stable(feature = "cell_as_ptr", since = "1.12.0")]
#[rustc_const_stable(feature = "const_cell_as_ptr", since = "1.32.0")]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[rustc_never_returns_null_ptr]
pub const fn as_ptr(&self) -> *mut T {
self.value.get()
@ -1149,6 +1150,7 @@ impl<T: ?Sized> RefCell<T> {
/// ```
#[inline]
#[stable(feature = "cell_as_ptr", since = "1.12.0")]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[rustc_never_returns_null_ptr]
pub fn as_ptr(&self) -> *mut T {
self.value.get()
@ -2158,6 +2160,7 @@ impl<T: ?Sized> UnsafeCell<T> {
#[inline(always)]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "const_unsafecell_get", since = "1.32.0")]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[rustc_never_returns_null_ptr]
pub const fn get(&self) -> *mut T {
// We can just cast the pointer from `UnsafeCell<T>` to `T` because of
@ -2271,6 +2274,7 @@ impl<T: DispatchFromDyn<U>, U> DispatchFromDyn<UnsafeCell<U>> for UnsafeCell<T>
/// See [`UnsafeCell`] for details.
#[unstable(feature = "sync_unsafe_cell", issue = "95439")]
#[repr(transparent)]
#[rustc_diagnostic_item = "SyncUnsafeCell"]
#[rustc_pub_transparent]
pub struct SyncUnsafeCell<T: ?Sized> {
value: UnsafeCell<T>,
@ -2304,6 +2308,7 @@ impl<T: ?Sized> SyncUnsafeCell<T> {
/// when casting to `&mut T`, and ensure that there are no mutations
/// or mutable aliases going on when casting to `&T`
#[inline]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[rustc_never_returns_null_ptr]
pub const fn get(&self) -> *mut T {
self.value.get()

1
library/core/src/ffi/c_str.rs
View File

@ -500,6 +500,7 @@ impl CStr {
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "const_str_as_ptr", since = "1.32.0")]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[rustc_never_returns_null_ptr]
pub const fn as_ptr(&self) -> *const c_char {
self.inner.as_ptr()

2
library/core/src/mem/maybe_uninit.rs
View File

@ -525,6 +525,7 @@ impl<T> MaybeUninit<T> {
/// until they are, it is advisable to avoid them.)
#[stable(feature = "maybe_uninit", since = "1.36.0")]
#[rustc_const_stable(feature = "const_maybe_uninit_as_ptr", since = "1.59.0")]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[inline(always)]
pub const fn as_ptr(&self) -> *const T {
// `MaybeUninit` and `ManuallyDrop` are both `repr(transparent)` so we can cast the pointer.
@ -566,6 +567,7 @@ impl<T> MaybeUninit<T> {
/// until they are, it is advisable to avoid them.)
#[stable(feature = "maybe_uninit", since = "1.36.0")]
#[rustc_const_stable(feature = "const_maybe_uninit_as_mut_ptr", since = "1.83.0")]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[inline(always)]
pub const fn as_mut_ptr(&mut self) -> *mut T {
// `MaybeUninit` and `ManuallyDrop` are both `repr(transparent)` so we can cast the pointer.

2
library/core/src/slice/mod.rs
View File

@ -735,6 +735,7 @@ impl<T> [T] {
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "const_slice_as_ptr", since = "1.32.0")]
#[rustc_never_returns_null_ptr]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[inline(always)]
#[must_use]
pub const fn as_ptr(&self) -> *const T {
@ -765,6 +766,7 @@ impl<T> [T] {
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "const_ptr_offset", since = "1.61.0")]
#[rustc_never_returns_null_ptr]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[inline(always)]
#[must_use]
pub const fn as_mut_ptr(&mut self) -> *mut T {

2
library/core/src/str/mod.rs
View File

@ -373,6 +373,7 @@ impl str {
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "rustc_str_as_ptr", since = "1.32.0")]
#[rustc_never_returns_null_ptr]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[must_use]
#[inline(always)]
pub const fn as_ptr(&self) -> *const u8 {
@ -390,6 +391,7 @@ impl str {
#[stable(feature = "str_as_mut_ptr", since = "1.36.0")]
#[rustc_const_stable(feature = "const_str_as_mut", since = "1.83.0")]
#[rustc_never_returns_null_ptr]
#[cfg_attr(not(bootstrap), rustc_as_ptr)]
#[must_use]
#[inline(always)]
pub const fn as_mut_ptr(&mut self) -> *mut u8 {

2
src/ci/github-actions/jobs.yml
View File

@ -477,7 +477,7 @@ auto:
--enable-profiler
SCRIPT: python x.py dist bootstrap --include-default-paths
DIST_REQUIRE_ALL_TOOLS: 1
<<: *job-windows-8c
<<: *job-windows
- image: dist-i686-mingw
env:

7
tests/ui/lint/dangling-pointers-from-temporaries/types.rs
View File

@ -1,6 +1,7 @@
#![deny(dangling_pointers_from_temporaries)]
#![feature(sync_unsafe_cell)]
use std::cell::Cell;
use std::cell::{Cell, SyncUnsafeCell, UnsafeCell};
use std::ffi::{CStr, CString};
use std::mem::MaybeUninit;
@ -47,6 +48,10 @@ fn main() {
//~^ ERROR a dangling pointer will be produced because the temporary `MaybeUninit<u8>` will be dropped
declval::<Vec<AsPtrFake>>().as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `Vec<AsPtrFake>` will be dropped
declval::<UnsafeCell<u8>>().get();
//~^ ERROR a dangling pointer will be produced because the temporary `UnsafeCell<u8>` will be dropped
declval::<SyncUnsafeCell<u8>>().get();
//~^ ERROR a dangling pointer will be produced because the temporary `SyncUnsafeCell<u8>` will be dropped
declval::<Box<AsPtrFake>>().as_ptr();
declval::<AsPtrFake>().as_ptr();
}

54
tests/ui/lint/dangling-pointers-from-temporaries/types.stderr
View File

@ -1,5 +1,5 @@
error: a dangling pointer will be produced because the temporary `CString` will be dropped
--> $DIR/types.rs:20:26
--> $DIR/types.rs:21:26
|
LL | declval::<CString>().as_ptr();
| -------------------- ^^^^^^ this pointer will immediately be invalid
@ -15,7 +15,7 @@ LL | #![deny(dangling_pointers_from_temporaries)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: a dangling pointer will be produced because the temporary `String` will be dropped
--> $DIR/types.rs:22:25
--> $DIR/types.rs:23:25
|
LL | declval::<String>().as_ptr();
| ------------------- ^^^^^^ this pointer will immediately be invalid
@ -26,7 +26,7 @@ LL | declval::<String>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Vec<u8>` will be dropped
--> $DIR/types.rs:24:26
--> $DIR/types.rs:25:26
|
LL | declval::<Vec<u8>>().as_ptr();
| -------------------- ^^^^^^ this pointer will immediately be invalid
@ -37,7 +37,7 @@ LL | declval::<Vec<u8>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Box<CString>` will be dropped
--> $DIR/types.rs:26:31
--> $DIR/types.rs:27:31
|
LL | declval::<Box<CString>>().as_ptr();
| ------------------------- ^^^^^^ this pointer will immediately be invalid
@ -48,7 +48,7 @@ LL | declval::<Box<CString>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Box<[u8]>` will be dropped
--> $DIR/types.rs:28:28
--> $DIR/types.rs:29:28
|
LL | declval::<Box<[u8]>>().as_ptr();
| ---------------------- ^^^^^^ this pointer will immediately be invalid
@ -59,7 +59,7 @@ LL | declval::<Box<[u8]>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Box<str>` will be dropped
--> $DIR/types.rs:30:27
--> $DIR/types.rs:31:27
|
LL | declval::<Box<str>>().as_ptr();
| --------------------- ^^^^^^ this pointer will immediately be invalid
@ -70,7 +70,7 @@ LL | declval::<Box<str>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Box<CStr>` will be dropped
--> $DIR/types.rs:32:28
--> $DIR/types.rs:33:28
|
LL | declval::<Box<CStr>>().as_ptr();
| ---------------------- ^^^^^^ this pointer will immediately be invalid
@ -81,7 +81,7 @@ LL | declval::<Box<CStr>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `[u8; 10]` will be dropped
--> $DIR/types.rs:34:27
--> $DIR/types.rs:35:27
|
LL | declval::<[u8; 10]>().as_ptr();
| --------------------- ^^^^^^ this pointer will immediately be invalid
@ -92,7 +92,7 @@ LL | declval::<[u8; 10]>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Box<[u8; 10]>` will be dropped
--> $DIR/types.rs:36:32
--> $DIR/types.rs:37:32
|
LL | declval::<Box<[u8; 10]>>().as_ptr();
| -------------------------- ^^^^^^ this pointer will immediately be invalid
@ -103,7 +103,7 @@ LL | declval::<Box<[u8; 10]>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Box<Vec<u8>>` will be dropped
--> $DIR/types.rs:38:31
--> $DIR/types.rs:39:31
|
LL | declval::<Box<Vec<u8>>>().as_ptr();
| ------------------------- ^^^^^^ this pointer will immediately be invalid
@ -114,7 +114,7 @@ LL | declval::<Box<Vec<u8>>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Box<String>` will be dropped
--> $DIR/types.rs:40:30
--> $DIR/types.rs:41:30
|
LL | declval::<Box<String>>().as_ptr();
| ------------------------ ^^^^^^ this pointer will immediately be invalid
@ -125,7 +125,7 @@ LL | declval::<Box<String>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Box<Box<Box<Box<[u8]>>>>` will be dropped
--> $DIR/types.rs:42:43
--> $DIR/types.rs:43:43
|
LL | declval::<Box<Box<Box<Box<[u8]>>>>>().as_ptr();
| ------------------------------------- ^^^^^^ this pointer will immediately be invalid
@ -136,7 +136,7 @@ LL | declval::<Box<Box<Box<Box<[u8]>>>>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Cell<u8>` will be dropped
--> $DIR/types.rs:44:27
--> $DIR/types.rs:45:27
|
LL | declval::<Cell<u8>>().as_ptr();
| --------------------- ^^^^^^ this pointer will immediately be invalid
@ -147,7 +147,7 @@ LL | declval::<Cell<u8>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `MaybeUninit<u8>` will be dropped
--> $DIR/types.rs:46:34
--> $DIR/types.rs:47:34
|
LL | declval::<MaybeUninit<u8>>().as_ptr();
| ---------------------------- ^^^^^^ this pointer will immediately be invalid
@ -158,7 +158,7 @@ LL | declval::<MaybeUninit<u8>>().as_ptr();
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `Vec<AsPtrFake>` will be dropped
--> $DIR/types.rs:48:33
--> $DIR/types.rs:49:33
|
LL | declval::<Vec<AsPtrFake>>().as_ptr();
| --------------------------- ^^^^^^ this pointer will immediately be invalid
@ -168,5 +168,27 @@ LL | declval::<Vec<AsPtrFake>>().as_ptr();
= note: pointers do not have a lifetime; when calling `as_ptr` the `Vec<AsPtrFake>` will be deallocated at the end of the statement because nothing is referencing it as far as the type system is concerned
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: aborting due to 15 previous errors
error: a dangling pointer will be produced because the temporary `UnsafeCell<u8>` will be dropped
--> $DIR/types.rs:51:33
|
LL | declval::<UnsafeCell<u8>>().get();
| --------------------------- ^^^ this pointer will immediately be invalid
| |
| this `UnsafeCell<u8>` is deallocated at the end of the statement, bind it to a variable to extend its lifetime
|
= note: pointers do not have a lifetime; when calling `get` the `UnsafeCell<u8>` will be deallocated at the end of the statement because nothing is referencing it as far as the type system is concerned
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: a dangling pointer will be produced because the temporary `SyncUnsafeCell<u8>` will be dropped
--> $DIR/types.rs:53:37
|
LL | declval::<SyncUnsafeCell<u8>>().get();
| ------------------------------- ^^^ this pointer will immediately be invalid
| |
| this `SyncUnsafeCell<u8>` is deallocated at the end of the statement, bind it to a variable to extend its lifetime
|
= note: pointers do not have a lifetime; when calling `get` the `SyncUnsafeCell<u8>` will be deallocated at the end of the statement because nothing is referencing it as far as the type system is concerned
= help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
error: aborting due to 17 previous errors

90
tests/ui/traits/const-traits/const-fns-are-early-bound.rs
View File

@ -1,90 +0,0 @@
//@ known-bug: #110395
//@ failure-status: 101
//@ dont-check-compiler-stderr
// FIXME(const_trait_impl) check-pass
//@ compile-flags: -Znext-solver
#![crate_type = "lib"]
#![allow(internal_features, incomplete_features)]
#![no_std]
#![no_core]
#![feature(
auto_traits,
const_trait_impl,
effects,
lang_items,
no_core,
staged_api,
unboxed_closures,
rustc_attrs,
marker_trait_attr,
)]
#![stable(feature = "minicore", since = "1.0.0")]
fn test() {
fn is_const_fn<F>(_: F)
where
F: const FnOnce<()>,
{
}
const fn foo() {}
is_const_fn(foo);
}
/// ---------------------------------------------------------------------- ///
/// Const fn trait definitions
#[const_trait]
#[lang = "fn"]
#[rustc_paren_sugar]
trait Fn<Args: Tuple>: ~const FnMut<Args> {
extern "rust-call" fn call(&self, args: Args) -> Self::Output;
}
#[const_trait]
#[lang = "fn_mut"]
#[rustc_paren_sugar]
trait FnMut<Args: Tuple>: ~const FnOnce<Args> {
extern "rust-call" fn call_mut(&mut self, args: Args) -> Self::Output;
}
#[const_trait]
#[lang = "fn_once"]
#[rustc_paren_sugar]
trait FnOnce<Args: Tuple> {
#[lang = "fn_once_output"]
type Output;
extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
}
/// ---------------------------------------------------------------------- ///
/// All this other stuff needed for core. Unrelated to test.
#[lang = "destruct"]
#[const_trait]
trait Destruct {}
#[lang = "freeze"]
unsafe auto trait Freeze {}
#[lang = "drop"]
#[const_trait]
trait Drop {
fn drop(&mut self);
}
#[lang = "sized"]
trait Sized {}
#[lang = "copy"]
trait Copy {}
#[lang = "tuple_trait"]
trait Tuple {}
#[lang = "legacy_receiver"]
trait LegacyReceiver {}
impl<T: ?Sized> LegacyReceiver for &T {}

22
tests/ui/traits/const-traits/effects/minicore-const-fn-early-bound.rs Normal file
View File

@ -0,0 +1,22 @@
//@ aux-build:minicore.rs
//@ compile-flags: --crate-type=lib -Znext-solver -Cpanic=abort
//@ check-pass
#![feature(no_core, const_trait_impl)]
#![no_std]
#![no_core]
extern crate minicore;
use minicore::*;
fn is_const_fn<F>(_: F)
where
F: const FnOnce(),
{
}
const fn foo() {}
fn test() {
is_const_fn(foo);
}

21
tests/ui/traits/const-traits/effects/minicore-fn-fail.rs Normal file
View File

@ -0,0 +1,21 @@
//@ aux-build:minicore.rs
//@ compile-flags: --crate-type=lib -Znext-solver
#![feature(no_core, const_trait_impl)]
#![no_std]
#![no_core]
extern crate minicore;
use minicore::*;
const fn call_indirect<T: ~const Fn()>(t: &T) { t() }
#[const_trait]
trait Foo {}
impl Foo for () {}
const fn foo<T: ~const Foo>() {}
const fn test() {
call_indirect(&foo::<()>);
//~^ ERROR the trait bound `(): ~const Foo` is not satisfied
}

9
tests/ui/traits/const-traits/effects/minicore-fn-fail.stderr Normal file
View File

@ -0,0 +1,9 @@
error[E0277]: the trait bound `(): ~const Foo` is not satisfied
--> $DIR/minicore-fn-fail.rs:19:5
|
LL | call_indirect(&foo::<()>);
| ^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.

6
tests/ui/traits/const-traits/effects/minicore-works.rs
View File

@ -20,3 +20,9 @@ const fn test_op() {
let _x = Add::add(1, 2);
let _y = Custom + Custom;
}
const fn call_indirect<T: ~const Fn()>(t: &T) { t() }
const fn call() {
call_indirect(&call);
}