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Commit | Line | Data |
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1b1a35ee | 1 | use super::callee::DeferredCallResolution; |
1b1a35ee | 2 | |
c295e0f8 | 3 | use rustc_data_structures::fx::FxHashSet; |
1b1a35ee | 4 | use rustc_hir as hir; |
064997fb | 5 | use rustc_hir::def_id::LocalDefId; |
1b1a35ee XL |
6 | use rustc_hir::HirIdMap; |
7 | use rustc_infer::infer; | |
2b03887a | 8 | use rustc_infer::infer::{DefiningAnchor, InferCtxt, InferOk, TyCtxtInferExt}; |
064997fb | 9 | use rustc_middle::ty::visit::TypeVisitable; |
94222f64 | 10 | use rustc_middle::ty::{self, Ty, TyCtxt}; |
064997fb | 11 | use rustc_span::def_id::LocalDefIdMap; |
1b1a35ee | 12 | use rustc_span::{self, Span}; |
487cf647 | 13 | use rustc_trait_selection::traits::{self, TraitEngine, TraitEngineExt as _}; |
1b1a35ee XL |
14 | |
15 | use std::cell::RefCell; | |
16 | use std::ops::Deref; | |
17 | ||
18 | /// Closures defined within the function. For example: | |
04454e1e FG |
19 | /// ```ignore (illustrative) |
20 | /// fn foo() { | |
21 | /// bar(move|| { ... }) | |
22 | /// } | |
23 | /// ``` | |
1b1a35ee XL |
24 | /// Here, the function `foo()` and the closure passed to |
25 | /// `bar()` will each have their own `FnCtxt`, but they will | |
26 | /// share the inherited fields. | |
2b03887a FG |
27 | pub struct Inherited<'tcx> { |
28 | pub(super) infcx: InferCtxt<'tcx>, | |
1b1a35ee | 29 | |
2b03887a | 30 | pub(super) typeck_results: RefCell<ty::TypeckResults<'tcx>>, |
1b1a35ee XL |
31 | |
32 | pub(super) locals: RefCell<HirIdMap<super::LocalTy<'tcx>>>, | |
33 | ||
34 | pub(super) fulfillment_cx: RefCell<Box<dyn TraitEngine<'tcx>>>, | |
35 | ||
487cf647 FG |
36 | /// Some additional `Sized` obligations badly affect type inference. |
37 | /// These obligations are added in a later stage of typeck. | |
38 | /// Removing these may also cause additional complications, see #101066. | |
1b1a35ee XL |
39 | pub(super) deferred_sized_obligations: |
40 | RefCell<Vec<(Ty<'tcx>, Span, traits::ObligationCauseCode<'tcx>)>>, | |
41 | ||
487cf647 FG |
42 | /// When we process a call like `c()` where `c` is a closure type, |
43 | /// we may not have decided yet whether `c` is a `Fn`, `FnMut`, or | |
44 | /// `FnOnce` closure. In that case, we defer full resolution of the | |
45 | /// call until upvar inference can kick in and make the | |
46 | /// decision. We keep these deferred resolutions grouped by the | |
47 | /// def-id of the closure, so that once we decide, we can easily go | |
48 | /// back and process them. | |
064997fb | 49 | pub(super) deferred_call_resolutions: RefCell<LocalDefIdMap<Vec<DeferredCallResolution<'tcx>>>>, |
1b1a35ee XL |
50 | |
51 | pub(super) deferred_cast_checks: RefCell<Vec<super::cast::CastCheck<'tcx>>>, | |
52 | ||
2b03887a | 53 | pub(super) deferred_transmute_checks: RefCell<Vec<(Ty<'tcx>, Ty<'tcx>, hir::HirId)>>, |
923072b8 FG |
54 | |
55 | pub(super) deferred_asm_checks: RefCell<Vec<(&'tcx hir::InlineAsm<'tcx>, hir::HirId)>>, | |
56 | ||
1b1a35ee XL |
57 | pub(super) deferred_generator_interiors: |
58 | RefCell<Vec<(hir::BodyId, Ty<'tcx>, hir::GeneratorKind)>>, | |
59 | ||
1b1a35ee | 60 | pub(super) body_id: Option<hir::BodyId>, |
c295e0f8 XL |
61 | |
62 | /// Whenever we introduce an adjustment from `!` into a type variable, | |
63 | /// we record that type variable here. This is later used to inform | |
64 | /// fallback. See the `fallback` module for details. | |
65 | pub(super) diverging_type_vars: RefCell<FxHashSet<Ty<'tcx>>>, | |
1b1a35ee XL |
66 | } |
67 | ||
2b03887a FG |
68 | impl<'tcx> Deref for Inherited<'tcx> { |
69 | type Target = InferCtxt<'tcx>; | |
1b1a35ee XL |
70 | fn deref(&self) -> &Self::Target { |
71 | &self.infcx | |
72 | } | |
73 | } | |
74 | ||
5e7ed085 | 75 | /// A temporary returned by `Inherited::build(...)`. This is necessary |
2b03887a | 76 | /// for multiple `InferCtxt` to share the same `typeck_results` |
5e7ed085 | 77 | /// without using `Rc` or something similar. |
1b1a35ee XL |
78 | pub struct InheritedBuilder<'tcx> { |
79 | infcx: infer::InferCtxtBuilder<'tcx>, | |
80 | def_id: LocalDefId, | |
2b03887a | 81 | typeck_results: RefCell<ty::TypeckResults<'tcx>>, |
1b1a35ee XL |
82 | } |
83 | ||
2b03887a | 84 | impl<'tcx> Inherited<'tcx> { |
1b1a35ee XL |
85 | pub fn build(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> InheritedBuilder<'tcx> { |
86 | let hir_owner = tcx.hir().local_def_id_to_hir_id(def_id).owner; | |
87 | ||
88 | InheritedBuilder { | |
064997fb FG |
89 | infcx: tcx |
90 | .infer_ctxt() | |
91 | .ignoring_regions() | |
487cf647 | 92 | .with_opaque_type_inference(DefiningAnchor::Bind(hir_owner.def_id)), |
1b1a35ee | 93 | def_id, |
2b03887a | 94 | typeck_results: RefCell::new(ty::TypeckResults::new(hir_owner)), |
1b1a35ee XL |
95 | } |
96 | } | |
97 | } | |
98 | ||
99 | impl<'tcx> InheritedBuilder<'tcx> { | |
2b03887a | 100 | pub fn enter<F, R>(mut self, f: F) -> R |
1b1a35ee | 101 | where |
2b03887a | 102 | F: FnOnce(&Inherited<'tcx>) -> R, |
1b1a35ee XL |
103 | { |
104 | let def_id = self.def_id; | |
2b03887a | 105 | f(&Inherited::new(self.infcx.build(), def_id, self.typeck_results)) |
1b1a35ee XL |
106 | } |
107 | } | |
108 | ||
2b03887a FG |
109 | impl<'tcx> Inherited<'tcx> { |
110 | fn new( | |
111 | infcx: InferCtxt<'tcx>, | |
112 | def_id: LocalDefId, | |
113 | typeck_results: RefCell<ty::TypeckResults<'tcx>>, | |
114 | ) -> Self { | |
1b1a35ee | 115 | let tcx = infcx.tcx; |
064997fb | 116 | let body_id = tcx.hir().maybe_body_owned_by(def_id); |
1b1a35ee XL |
117 | |
118 | Inherited { | |
064997fb | 119 | typeck_results, |
1b1a35ee | 120 | infcx, |
6a06907d | 121 | fulfillment_cx: RefCell::new(<dyn TraitEngine<'_>>::new(tcx)), |
1b1a35ee XL |
122 | locals: RefCell::new(Default::default()), |
123 | deferred_sized_obligations: RefCell::new(Vec::new()), | |
124 | deferred_call_resolutions: RefCell::new(Default::default()), | |
125 | deferred_cast_checks: RefCell::new(Vec::new()), | |
923072b8 FG |
126 | deferred_transmute_checks: RefCell::new(Vec::new()), |
127 | deferred_asm_checks: RefCell::new(Vec::new()), | |
1b1a35ee | 128 | deferred_generator_interiors: RefCell::new(Vec::new()), |
c295e0f8 | 129 | diverging_type_vars: RefCell::new(Default::default()), |
1b1a35ee XL |
130 | body_id, |
131 | } | |
132 | } | |
133 | ||
5e7ed085 | 134 | #[instrument(level = "debug", skip(self))] |
1b1a35ee | 135 | pub(super) fn register_predicate(&self, obligation: traits::PredicateObligation<'tcx>) { |
1b1a35ee XL |
136 | if obligation.has_escaping_bound_vars() { |
137 | span_bug!(obligation.cause.span, "escaping bound vars in predicate {:?}", obligation); | |
138 | } | |
139 | self.fulfillment_cx.borrow_mut().register_predicate_obligation(self, obligation); | |
140 | } | |
141 | ||
142 | pub(super) fn register_predicates<I>(&self, obligations: I) | |
143 | where | |
144 | I: IntoIterator<Item = traits::PredicateObligation<'tcx>>, | |
145 | { | |
146 | for obligation in obligations { | |
147 | self.register_predicate(obligation); | |
148 | } | |
149 | } | |
150 | ||
151 | pub(super) fn register_infer_ok_obligations<T>(&self, infer_ok: InferOk<'tcx, T>) -> T { | |
152 | self.register_predicates(infer_ok.obligations); | |
153 | infer_ok.value | |
154 | } | |
1b1a35ee | 155 | } |