diff options
| -rw-r--r-- | compiler/rustc_const_eval/src/check_consts/check.rs | 88 | ||||
| -rw-r--r-- | tests/ui/traits/const-traits/cross-crate.rs | 2 | ||||
| -rw-r--r-- | tests/ui/traits/const-traits/cross-crate.stocknc.stderr | 11 |
3 files changed, 72 insertions, 29 deletions
diff --git a/compiler/rustc_const_eval/src/check_consts/check.rs b/compiler/rustc_const_eval/src/check_consts/check.rs index b6c227638a1..779de61edc3 100644 --- a/compiler/rustc_const_eval/src/check_consts/check.rs +++ b/compiler/rustc_const_eval/src/check_consts/check.rs @@ -11,7 +11,6 @@ use rustc_hir::def_id::DefId; use rustc_hir::{self as hir, LangItem}; use rustc_index::bit_set::BitSet; use rustc_infer::infer::TyCtxtInferExt; -use rustc_infer::traits::ObligationCause; use rustc_middle::mir::visit::Visitor; use rustc_middle::mir::*; use rustc_middle::span_bug; @@ -20,9 +19,11 @@ use rustc_middle::ty::{self, Instance, InstanceKind, Ty, TypeVisitableExt}; use rustc_mir_dataflow::Analysis; use rustc_mir_dataflow::impls::MaybeStorageLive; use rustc_mir_dataflow::storage::always_storage_live_locals; -use rustc_span::{DUMMY_SP, Span, Symbol, sym}; +use rustc_span::{Span, Symbol, sym}; use rustc_trait_selection::error_reporting::InferCtxtErrorExt; -use rustc_trait_selection::traits::{self, ObligationCauseCode, ObligationCtxt}; +use rustc_trait_selection::traits::{ + Obligation, ObligationCause, ObligationCauseCode, ObligationCtxt, +}; use tracing::{debug, instrument, trace}; use super::ops::{self, NonConstOp, Status}; @@ -360,6 +361,60 @@ impl<'mir, 'tcx> Checker<'mir, 'tcx> { // end of evaluation. !is_transient } + + fn revalidate_conditional_constness( + &self, + callee: DefId, + callee_args: ty::GenericArgsRef<'tcx>, + call_source: CallSource, + call_span: Span, + ) { + let tcx = self.tcx; + if !tcx.is_conditionally_const(callee) { + return; + } + + let infcx = tcx.infer_ctxt().build(self.body.typing_mode(tcx)); + let ocx = ObligationCtxt::new_with_diagnostics(&infcx); + + let const_conditions = tcx.const_conditions(callee).instantiate(tcx, callee_args); + + let body_id = self.body.source.def_id().expect_local(); + let host_polarity = match self.const_kind() { + hir::ConstContext::ConstFn => ty::BoundConstness::Maybe, + hir::ConstContext::Static(_) | hir::ConstContext::Const { .. } => { + ty::BoundConstness::Const + } + }; + let const_conditions = ocx.normalize( + &ObligationCause::misc(call_span, body_id), + self.param_env, + const_conditions, + ); + ocx.register_obligations(const_conditions.into_iter().map(|(trait_ref, span)| { + Obligation::new( + tcx, + ObligationCause::new( + call_span, + body_id, + ObligationCauseCode::WhereClause(callee, span), + ), + self.param_env, + trait_ref.to_host_effect_clause(tcx, host_polarity), + ) + })); + + let errors = ocx.select_all_or_error(); + if !errors.is_empty() { + // FIXME(effects): Soon this should be unconditionally delaying a bug. + if matches!(call_source, CallSource::Normal) && tcx.features().effects() { + tcx.dcx() + .span_delayed_bug(call_span, "this should have reported a ~const error in HIR"); + } else { + infcx.err_ctxt().report_fulfillment_errors(errors); + } + } + } } impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> { @@ -584,31 +639,12 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> { } }; - // Check that all trait bounds that are marked as `~const` can be satisfied. - // - // Typeck only does a "non-const" check since it operates on HIR and cannot distinguish - // which path expressions are getting called on and which path expressions are only used - // as function pointers. This is required for correctness. - let infcx = tcx.infer_ctxt().build(body.typing_mode(tcx)); - let ocx = ObligationCtxt::new_with_diagnostics(&infcx); - - let predicates = tcx.predicates_of(callee).instantiate(tcx, fn_args); - let cause = ObligationCause::new( + self.revalidate_conditional_constness( + callee, + fn_args, + call_source, terminator.source_info.span, - self.body.source.def_id().expect_local(), - ObligationCauseCode::WhereClause(callee, DUMMY_SP), ); - let normalized_predicates = ocx.normalize(&cause, param_env, predicates); - ocx.register_obligations(traits::predicates_for_generics( - |_, _| cause.clone(), - self.param_env, - normalized_predicates, - )); - - let errors = ocx.select_all_or_error(); - if !errors.is_empty() { - infcx.err_ctxt().report_fulfillment_errors(errors); - } let mut is_trait = false; // Attempting to call a trait method? diff --git a/tests/ui/traits/const-traits/cross-crate.rs b/tests/ui/traits/const-traits/cross-crate.rs index cfcada9c828..06c6e54dce4 100644 --- a/tests/ui/traits/const-traits/cross-crate.rs +++ b/tests/ui/traits/const-traits/cross-crate.rs @@ -18,7 +18,7 @@ const fn const_context() { #[cfg(any(stocknc, gatednc))] NonConst.func(); //[stocknc]~^ ERROR: cannot call - //[gatednc]~^^ ERROR: the trait bound + //[stocknc,gatednc]~^^ ERROR: the trait bound Const.func(); //[stock]~^ ERROR: cannot call //[stocknc]~^^ ERROR: cannot call diff --git a/tests/ui/traits/const-traits/cross-crate.stocknc.stderr b/tests/ui/traits/const-traits/cross-crate.stocknc.stderr index 5c3e3b6ff40..4ea3ae289ac 100644 --- a/tests/ui/traits/const-traits/cross-crate.stocknc.stderr +++ b/tests/ui/traits/const-traits/cross-crate.stocknc.stderr @@ -1,3 +1,9 @@ +error[E0277]: the trait bound `cross_crate::NonConst: ~const cross_crate::MyTrait` is not satisfied + --> $DIR/cross-crate.rs:19:5 + | +LL | NonConst.func(); + | ^^^^^^^^^^^^^^^ + error[E0015]: cannot call non-const fn `<cross_crate::NonConst as cross_crate::MyTrait>::func` in constant functions --> $DIR/cross-crate.rs:19:14 | @@ -22,6 +28,7 @@ help: add `#![feature(const_trait_impl)]` to the crate attributes to enable LL + #![feature(const_trait_impl)] | -error: aborting due to 2 previous errors +error: aborting due to 3 previous errors -For more information about this error, try `rustc --explain E0015`. +Some errors have detailed explanations: E0015, E0277. +For more information about an error, try `rustc --explain E0015`. |