diff options
Diffstat (limited to 'compiler')
| -rw-r--r-- | compiler/rustc_ast_lowering/src/asm.rs | 4 | ||||
| -rw-r--r-- | compiler/rustc_ast_lowering/src/expr.rs | 2 | ||||
| -rw-r--r-- | compiler/rustc_ast_lowering/src/lib.rs | 7 | ||||
| -rw-r--r-- | compiler/rustc_feature/src/unstable.rs | 2 | ||||
| -rw-r--r-- | compiler/rustc_middle/src/ty/consts.rs | 32 | ||||
| -rw-r--r-- | compiler/rustc_resolve/src/def_collector.rs | 16 | ||||
| -rw-r--r-- | compiler/rustc_span/src/symbol.rs | 1 |
7 files changed, 42 insertions, 22 deletions
diff --git a/compiler/rustc_ast_lowering/src/asm.rs b/compiler/rustc_ast_lowering/src/asm.rs index 51cbe808a3a..e077c544965 100644 --- a/compiler/rustc_ast_lowering/src/asm.rs +++ b/compiler/rustc_ast_lowering/src/asm.rs @@ -220,7 +220,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { let parent_def_id = self.current_def_id_parent; let node_id = self.next_node_id(); // HACK(min_generic_const_args): see lower_anon_const - if !expr.is_potential_trivial_const_arg() { + if !self.tcx.features().const_arg_path + || !expr.is_potential_trivial_const_arg() + { self.create_def( parent_def_id, node_id, diff --git a/compiler/rustc_ast_lowering/src/expr.rs b/compiler/rustc_ast_lowering/src/expr.rs index b5d8a547a8f..bb86e5c9325 100644 --- a/compiler/rustc_ast_lowering/src/expr.rs +++ b/compiler/rustc_ast_lowering/src/expr.rs @@ -387,7 +387,7 @@ impl<'hir> LoweringContext<'_, 'hir> { let node_id = self.next_node_id(); // HACK(min_generic_const_args): see lower_anon_const - if !arg.is_potential_trivial_const_arg() { + if !self.tcx.features().const_arg_path || !arg.is_potential_trivial_const_arg() { // Add a definition for the in-band const def. self.create_def(parent_def_id, node_id, kw::Empty, DefKind::AnonConst, f.span); } diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs index 81d17a9dec2..4b8c47ac4b4 100644 --- a/compiler/rustc_ast_lowering/src/lib.rs +++ b/compiler/rustc_ast_lowering/src/lib.rs @@ -2358,7 +2358,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { span: Span, ) -> &'hir hir::ConstArg<'hir> { let ct_kind = match res { - Res::Def(DefKind::ConstParam, _) => { + Res::Def(DefKind::ConstParam, _) if self.tcx.features().const_arg_path => { let qpath = self.lower_qpath( ty_id, &None, @@ -2433,7 +2433,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { self.resolver.get_partial_res(expr.id).and_then(|partial_res| partial_res.full_res()); debug!("res={:?}", maybe_res); // FIXME(min_generic_const_args): for now we only lower params to ConstArgKind::Path - if let Some(res) = maybe_res + if self.tcx.features().const_arg_path + && let Some(res) = maybe_res && let Res::Def(DefKind::ConstParam, _) = res && let ExprKind::Path(qself, path) = &expr.kind { @@ -2464,7 +2465,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { /// See [`hir::ConstArg`] for when to use this function vs /// [`Self::lower_anon_const_to_const_arg`]. fn lower_anon_const_to_anon_const(&mut self, c: &AnonConst) -> &'hir hir::AnonConst { - if c.value.is_potential_trivial_const_arg() { + if self.tcx.features().const_arg_path && c.value.is_potential_trivial_const_arg() { // HACK(min_generic_const_args): see DefCollector::visit_anon_const // Over there, we guess if this is a bare param and only create a def if // we think it's not. However we may can guess wrong (see there for example) diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs index 3a143c52a8c..4524458023d 100644 --- a/compiler/rustc_feature/src/unstable.rs +++ b/compiler/rustc_feature/src/unstable.rs @@ -193,6 +193,8 @@ declare_features! ( (unstable, anonymous_lifetime_in_impl_trait, "1.63.0", None), /// Allows identifying the `compiler_builtins` crate. (internal, compiler_builtins, "1.13.0", None), + /// Gating for a new desugaring of const arguments of usages of const parameters + (internal, const_arg_path, "1.81.0", None), /// Allows writing custom MIR (internal, custom_mir, "1.65.0", None), /// Outputs useful `assert!` messages diff --git a/compiler/rustc_middle/src/ty/consts.rs b/compiler/rustc_middle/src/ty/consts.rs index e373292741b..362ff8e988d 100644 --- a/compiler/rustc_middle/src/ty/consts.rs +++ b/compiler/rustc_middle/src/ty/consts.rs @@ -240,7 +240,7 @@ impl<'tcx> Const<'tcx> { let ty = tcx.type_of(def).no_bound_vars().expect("const parameter types cannot be generic"); - match Self::try_from_lit(tcx, ty, expr) { + match Self::try_from_lit_or_param(tcx, ty, expr) { Some(v) => v, None => ty::Const::new_unevaluated( tcx, @@ -281,7 +281,11 @@ impl<'tcx> Const<'tcx> { } #[instrument(skip(tcx), level = "debug")] - fn try_from_lit(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, expr: &'tcx hir::Expr<'tcx>) -> Option<Self> { + fn try_from_lit_or_param( + tcx: TyCtxt<'tcx>, + ty: Ty<'tcx>, + expr: &'tcx hir::Expr<'tcx>, + ) -> Option<Self> { // Unwrap a block, so that e.g. `{ P }` is recognised as a parameter. Const arguments // currently have to be wrapped in curly brackets, so it's necessary to special-case. let expr = match &expr.kind { @@ -291,6 +295,22 @@ impl<'tcx> Const<'tcx> { _ => expr, }; + if let hir::ExprKind::Path( + qpath @ hir::QPath::Resolved( + _, + &hir::Path { res: Res::Def(DefKind::ConstParam, _), .. }, + ), + ) = expr.kind + { + if tcx.features().const_arg_path { + span_bug!( + expr.span, + "try_from_lit: received const param which shouldn't be possible" + ); + } + return Some(Const::from_param(tcx, qpath, expr.hir_id)); + }; + let lit_input = match expr.kind { hir::ExprKind::Lit(lit) => Some(LitToConstInput { lit: &lit.node, ty, neg: false }), hir::ExprKind::Unary(hir::UnOp::Neg, expr) => match expr.kind { @@ -318,14 +338,6 @@ impl<'tcx> Const<'tcx> { } } - if let hir::ExprKind::Path(hir::QPath::Resolved( - _, - &hir::Path { res: Res::Def(DefKind::ConstParam, _), .. }, - )) = expr.kind - { - span_bug!(expr.span, "try_from_lit: received const param which shouldn't be possible") - } - None } diff --git a/compiler/rustc_resolve/src/def_collector.rs b/compiler/rustc_resolve/src/def_collector.rs index ed23870dfdf..3595db78e93 100644 --- a/compiler/rustc_resolve/src/def_collector.rs +++ b/compiler/rustc_resolve/src/def_collector.rs @@ -314,13 +314,15 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> { } fn visit_anon_const(&mut self, constant: &'a AnonConst) { - // HACK(min_generic_const_args): don't create defs for anon consts if we think they will - // later be turned into ConstArgKind::Path's. because this is before resolve is done, we - // may accidentally identify a construction of a unit struct as a param and not create a - // def. we'll then create a def later in ast lowering in this case. the parent of nested - // items will be messed up, but that's ok because there can't be any if we're just looking - // for bare idents. - if constant.value.is_potential_trivial_const_arg() { + if self.resolver.tcx.features().const_arg_path + && constant.value.is_potential_trivial_const_arg() + { + // HACK(min_generic_const_args): don't create defs for anon consts if we think they will + // later be turned into ConstArgKind::Path's. because this is before resolve is done, we + // may accidentally identify a construction of a unit struct as a param and not create a + // def. we'll then create a def later in ast lowering in this case. the parent of nested + // items will be messed up, but that's ok because there can't be any if we're just looking + // for bare idents. visit::walk_anon_const(self, constant) } else { let def = diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs index a2e94492f8c..942026cd7bf 100644 --- a/compiler/rustc_span/src/symbol.rs +++ b/compiler/rustc_span/src/symbol.rs @@ -595,6 +595,7 @@ symbols! { conservative_impl_trait, console, const_allocate, + const_arg_path, const_async_blocks, const_closures, const_compare_raw_pointers, |