rustc_traits/
type_op.rs

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1use std::fmt;
2
3use rustc_infer::infer::TyCtxtInferExt;
4use rustc_infer::infer::canonical::{Canonical, CanonicalQueryInput, QueryResponse};
5use rustc_middle::query::Providers;
6use rustc_middle::traits::query::NoSolution;
7use rustc_middle::ty::{Clause, FnSig, ParamEnvAnd, PolyFnSig, Ty, TyCtxt, TypeFoldable};
8use rustc_span::DUMMY_SP;
9use rustc_trait_selection::infer::InferCtxtBuilderExt;
10use rustc_trait_selection::traits::query::normalize::QueryNormalizeExt;
11use rustc_trait_selection::traits::query::type_op::ascribe_user_type::{
12    AscribeUserType, type_op_ascribe_user_type_with_span,
13};
14use rustc_trait_selection::traits::query::type_op::normalize::Normalize;
15use rustc_trait_selection::traits::query::type_op::prove_predicate::ProvePredicate;
16use rustc_trait_selection::traits::{Normalized, Obligation, ObligationCause, ObligationCtxt};
17
18pub(crate) fn provide(p: &mut Providers) {
19    *p = Providers {
20        type_op_ascribe_user_type,
21        type_op_prove_predicate,
22        type_op_normalize_ty,
23        type_op_normalize_clause,
24        type_op_normalize_fn_sig,
25        type_op_normalize_poly_fn_sig,
26        ..*p
27    };
28}
29
30fn type_op_ascribe_user_type<'tcx>(
31    tcx: TyCtxt<'tcx>,
32    canonicalized: CanonicalQueryInput<'tcx, ParamEnvAnd<'tcx, AscribeUserType<'tcx>>>,
33) -> Result<&'tcx Canonical<'tcx, QueryResponse<'tcx, ()>>, NoSolution> {
34    tcx.infer_ctxt().enter_canonical_trait_query(&canonicalized, |ocx, key| {
35        type_op_ascribe_user_type_with_span(ocx, key, DUMMY_SP)
36    })
37}
38
39fn type_op_normalize<'tcx, T>(
40    ocx: &ObligationCtxt<'_, 'tcx>,
41    key: ParamEnvAnd<'tcx, Normalize<T>>,
42) -> Result<T, NoSolution>
43where
44    T: fmt::Debug + TypeFoldable<TyCtxt<'tcx>>,
45{
46    let (param_env, Normalize { value }) = key.into_parts();
47    let Normalized { value, obligations } =
48        ocx.infcx.at(&ObligationCause::dummy(), param_env).query_normalize(value)?;
49    ocx.register_obligations(obligations);
50    Ok(value)
51}
52
53fn type_op_normalize_ty<'tcx>(
54    tcx: TyCtxt<'tcx>,
55    canonicalized: CanonicalQueryInput<'tcx, ParamEnvAnd<'tcx, Normalize<Ty<'tcx>>>>,
56) -> Result<&'tcx Canonical<'tcx, QueryResponse<'tcx, Ty<'tcx>>>, NoSolution> {
57    tcx.infer_ctxt().enter_canonical_trait_query(&canonicalized, type_op_normalize)
58}
59
60fn type_op_normalize_clause<'tcx>(
61    tcx: TyCtxt<'tcx>,
62    canonicalized: CanonicalQueryInput<'tcx, ParamEnvAnd<'tcx, Normalize<Clause<'tcx>>>>,
63) -> Result<&'tcx Canonical<'tcx, QueryResponse<'tcx, Clause<'tcx>>>, NoSolution> {
64    tcx.infer_ctxt().enter_canonical_trait_query(&canonicalized, type_op_normalize)
65}
66
67fn type_op_normalize_fn_sig<'tcx>(
68    tcx: TyCtxt<'tcx>,
69    canonicalized: CanonicalQueryInput<'tcx, ParamEnvAnd<'tcx, Normalize<FnSig<'tcx>>>>,
70) -> Result<&'tcx Canonical<'tcx, QueryResponse<'tcx, FnSig<'tcx>>>, NoSolution> {
71    tcx.infer_ctxt().enter_canonical_trait_query(&canonicalized, type_op_normalize)
72}
73
74fn type_op_normalize_poly_fn_sig<'tcx>(
75    tcx: TyCtxt<'tcx>,
76    canonicalized: CanonicalQueryInput<'tcx, ParamEnvAnd<'tcx, Normalize<PolyFnSig<'tcx>>>>,
77) -> Result<&'tcx Canonical<'tcx, QueryResponse<'tcx, PolyFnSig<'tcx>>>, NoSolution> {
78    tcx.infer_ctxt().enter_canonical_trait_query(&canonicalized, type_op_normalize)
79}
80
81fn type_op_prove_predicate<'tcx>(
82    tcx: TyCtxt<'tcx>,
83    canonicalized: CanonicalQueryInput<'tcx, ParamEnvAnd<'tcx, ProvePredicate<'tcx>>>,
84) -> Result<&'tcx Canonical<'tcx, QueryResponse<'tcx, ()>>, NoSolution> {
85    tcx.infer_ctxt().enter_canonical_trait_query(&canonicalized, |ocx, key| {
86        type_op_prove_predicate_with_cause(ocx, key, ObligationCause::dummy());
87        Ok(())
88    })
89}
90
91/// The core of the `type_op_prove_predicate` query: for diagnostics purposes in NLL HRTB errors,
92/// this query can be re-run to better track the span of the obligation cause, and improve the error
93/// message. Do not call directly unless you're in that very specific context.
94pub fn type_op_prove_predicate_with_cause<'tcx>(
95    ocx: &ObligationCtxt<'_, 'tcx>,
96    key: ParamEnvAnd<'tcx, ProvePredicate<'tcx>>,
97    cause: ObligationCause<'tcx>,
98) {
99    let (param_env, ProvePredicate { predicate }) = key.into_parts();
100    ocx.register_obligation(Obligation::new(ocx.infcx.tcx, cause, param_env, predicate));
101}
rustc_traits/type_op.rs

rustc_traits/
type_op.rs
