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1a4d82fc JJ |
1 | /*! |
2 | ||
9fa01778 | 3 | # typeck |
1a4d82fc JJ |
4 | |
5 | The type checker is responsible for: | |
6 | ||
0731742a XL |
7 | 1. Determining the type of each expression. |
8 | 2. Resolving methods and traits. | |
9 | 3. Guaranteeing that most type rules are met. ("Most?", you say, "why most?" | |
5869c6ff | 10 | Well, dear reader, read on.) |
1a4d82fc | 11 | |
5869c6ff | 12 | The main entry point is [`check_crate()`]. Type checking operates in |
1a4d82fc JJ |
13 | several major phases: |
14 | ||
15 | 1. The collect phase first passes over all items and determines their | |
16 | type, without examining their "innards". | |
17 | ||
0731742a | 18 | 2. Variance inference then runs to compute the variance of each parameter. |
1a4d82fc | 19 | |
0731742a | 20 | 3. Coherence checks for overlapping or orphaned impls. |
1a4d82fc JJ |
21 | |
22 | 4. Finally, the check phase then checks function bodies and so forth. | |
23 | Within the check phase, we check each function body one at a time | |
24 | (bodies of function expressions are checked as part of the | |
25 | containing function). Inference is used to supply types wherever | |
26 | they are unknown. The actual checking of a function itself has | |
27 | several phases (check, regionck, writeback), as discussed in the | |
5869c6ff | 28 | documentation for the [`check`] module. |
1a4d82fc JJ |
29 | |
30 | The type checker is defined into various submodules which are documented | |
31 | independently: | |
32 | ||
33 | - astconv: converts the AST representation of types | |
0731742a | 34 | into the `ty` representation. |
1a4d82fc JJ |
35 | |
36 | - collect: computes the types of each top-level item and enters them into | |
0731742a | 37 | the `tcx.types` table for later use. |
1a4d82fc | 38 | |
0731742a | 39 | - coherence: enforces coherence rules, builds some tables. |
1a4d82fc JJ |
40 | |
41 | - variance: variance inference | |
42 | ||
abe05a73 XL |
43 | - outlives: outlives inference |
44 | ||
1a4d82fc JJ |
45 | - check: walks over function bodies and type checks them, inferring types for |
46 | local variables, type parameters, etc as necessary. | |
47 | ||
48 | - infer: finds the types to use for each type variable such that | |
49 | all subtyping and assignment constraints are met. In essence, the check | |
50 | module specifies the constraints, and the infer module solves them. | |
51 | ||
0731742a | 52 | ## Note |
1a4d82fc JJ |
53 | |
54 | This API is completely unstable and subject to change. | |
55 | ||
56 | */ | |
9cc50fc6 | 57 | |
1b1a35ee | 58 | #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")] |
94222f64 | 59 | #![cfg_attr(bootstrap, feature(bindings_after_at))] |
60c5eb7d | 60 | #![feature(bool_to_option)] |
2c00a5a8 | 61 | #![feature(crate_visibility_modifier)] |
5869c6ff | 62 | #![feature(format_args_capture)] |
94222f64 | 63 | #![feature(if_let_guard)] |
dc9dc135 | 64 | #![feature(in_band_lifetimes)] |
fc512014 | 65 | #![feature(is_sorted)] |
cdc7bbd5 | 66 | #![feature(iter_zip)] |
0bf4aa26 | 67 | #![feature(nll)] |
dfeec247 | 68 | #![feature(try_blocks)] |
0531ce1d | 69 | #![feature(never_type)] |
ba9703b0 | 70 | #![feature(slice_partition_dedup)] |
29967ef6 | 71 | #![feature(control_flow_enum)] |
94222f64 | 72 | #![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard |
dfeec247 | 73 | #![recursion_limit = "256"] |
7cac9316 | 74 | |
dfeec247 | 75 | #[macro_use] |
3dfed10e | 76 | extern crate tracing; |
94b46f34 | 77 | |
dfeec247 | 78 | #[macro_use] |
ba9703b0 | 79 | extern crate rustc_middle; |
1a4d82fc | 80 | |
3dfed10e XL |
81 | // These are used by Clippy. |
82 | pub mod check; | |
60c5eb7d | 83 | pub mod expr_use_visitor; |
85aaf69f | 84 | |
2c00a5a8 | 85 | mod astconv; |
3dfed10e | 86 | mod bounds; |
7cac9316 | 87 | mod check_unused; |
2c00a5a8 | 88 | mod coherence; |
7cac9316 | 89 | mod collect; |
532ac7d7 | 90 | mod constrained_generic_params; |
1b1a35ee | 91 | mod errors; |
136023e0 | 92 | pub mod hir_wf_check; |
476ff2be | 93 | mod impl_wf_check; |
60c5eb7d | 94 | mod mem_categorization; |
abe05a73 | 95 | mod outlives; |
dfeec247 | 96 | mod structured_errors; |
7cac9316 | 97 | mod variance; |
1a4d82fc | 98 | |
ba9703b0 | 99 | use rustc_errors::{struct_span_err, ErrorReported}; |
dfeec247 | 100 | use rustc_hir as hir; |
17df50a5 | 101 | use rustc_hir::def_id::DefId; |
cdc7bbd5 | 102 | use rustc_hir::{Node, CRATE_HIR_ID}; |
74b04a01 | 103 | use rustc_infer::infer::{InferOk, TyCtxtInferExt}; |
ba9703b0 XL |
104 | use rustc_infer::traits::TraitEngineExt as _; |
105 | use rustc_middle::middle; | |
106 | use rustc_middle::ty::query::Providers; | |
107 | use rustc_middle::ty::{self, Ty, TyCtxt}; | |
108 | use rustc_middle::util; | |
109 | use rustc_session::config::EntryFnType; | |
f9652781 | 110 | use rustc_span::{symbol::sym, Span, DUMMY_SP}; |
dfeec247 | 111 | use rustc_target::spec::abi::Abi; |
ba9703b0 XL |
112 | use rustc_trait_selection::traits::error_reporting::InferCtxtExt as _; |
113 | use rustc_trait_selection::traits::{ | |
cdc7bbd5 | 114 | self, ObligationCause, ObligationCauseCode, TraitEngine, TraitEngineExt as _, |
ba9703b0 | 115 | }; |
60c5eb7d | 116 | |
0731742a XL |
117 | use std::iter; |
118 | ||
3dfed10e XL |
119 | use astconv::AstConv; |
120 | use bounds::Bounds; | |
1a4d82fc | 121 | |
dfeec247 | 122 | fn require_c_abi_if_c_variadic(tcx: TyCtxt<'_>, decl: &hir::FnDecl<'_>, abi: Abi, span: Span) { |
6a06907d XL |
123 | match (decl.c_variadic, abi) { |
124 | // The function has the correct calling convention, or isn't a "C-variadic" function. | |
125 | (false, _) | (true, Abi::C { .. }) | (true, Abi::Cdecl) => {} | |
126 | // The function is a "C-variadic" function with an incorrect calling convention. | |
127 | (true, _) => { | |
128 | let mut err = struct_span_err!( | |
129 | tcx.sess, | |
130 | span, | |
131 | E0045, | |
132 | "C-variadic function must have C or cdecl calling convention" | |
133 | ); | |
134 | err.span_label(span, "C-variadics require C or cdecl calling convention").emit(); | |
135 | } | |
c1a9b12d SL |
136 | } |
137 | } | |
138 | ||
dc9dc135 XL |
139 | fn require_same_types<'tcx>( |
140 | tcx: TyCtxt<'tcx>, | |
141 | cause: &ObligationCause<'tcx>, | |
142 | expected: Ty<'tcx>, | |
143 | actual: Ty<'tcx>, | |
144 | ) -> bool { | |
041b39d2 | 145 | tcx.infer_ctxt().enter(|ref infcx| { |
0531ce1d | 146 | let param_env = ty::ParamEnv::empty(); |
6a06907d | 147 | let mut fulfill_cx = <dyn TraitEngine<'_>>::new(infcx.tcx); |
7cac9316 | 148 | match infcx.at(&cause, param_env).eq(expected, actual) { |
c30ab7b3 | 149 | Ok(InferOk { obligations, .. }) => { |
cc61c64b | 150 | fulfill_cx.register_predicate_obligations(infcx, obligations); |
c30ab7b3 SL |
151 | } |
152 | Err(err) => { | |
32a655c1 | 153 | infcx.report_mismatched_types(cause, expected, actual, err).emit(); |
cc61c64b XL |
154 | return false; |
155 | } | |
156 | } | |
157 | ||
158 | match fulfill_cx.select_all_or_error(infcx) { | |
159 | Ok(()) => true, | |
160 | Err(errors) => { | |
0531ce1d | 161 | infcx.report_fulfillment_errors(&errors, None, false); |
c30ab7b3 SL |
162 | false |
163 | } | |
1a4d82fc | 164 | } |
a7813a04 | 165 | }) |
1a4d82fc JJ |
166 | } |
167 | ||
cdc7bbd5 XL |
168 | fn check_main_fn_ty(tcx: TyCtxt<'_>, main_def_id: DefId) { |
169 | let main_fnsig = tcx.fn_sig(main_def_id); | |
9fa01778 | 170 | let main_span = tcx.def_span(main_def_id); |
f9652781 | 171 | |
cdc7bbd5 XL |
172 | fn main_fn_diagnostics_hir_id(tcx: TyCtxt<'_>, def_id: DefId, sp: Span) -> hir::HirId { |
173 | if let Some(local_def_id) = def_id.as_local() { | |
174 | let hir_id = tcx.hir().local_def_id_to_hir_id(local_def_id); | |
175 | let hir_type = tcx.type_of(local_def_id); | |
176 | if !matches!(hir_type.kind(), ty::FnDef(..)) { | |
177 | span_bug!(sp, "main has a non-function type: found `{}`", hir_type); | |
178 | } | |
179 | hir_id | |
180 | } else { | |
181 | CRATE_HIR_ID | |
182 | } | |
183 | } | |
f9652781 | 184 | |
cdc7bbd5 XL |
185 | fn main_fn_generics_params_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> { |
186 | if !def_id.is_local() { | |
187 | return None; | |
188 | } | |
189 | let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local()); | |
190 | match tcx.hir().find(hir_id) { | |
191 | Some(Node::Item(hir::Item { kind: hir::ItemKind::Fn(_, ref generics, _), .. })) => { | |
192 | let generics_param_span = | |
193 | if !generics.params.is_empty() { Some(generics.span) } else { None }; | |
194 | generics_param_span | |
195 | } | |
196 | _ => { | |
197 | span_bug!(tcx.def_span(def_id), "main has a non-function type"); | |
1a4d82fc | 198 | } |
cdc7bbd5 XL |
199 | } |
200 | } | |
ff7c6d11 | 201 | |
cdc7bbd5 XL |
202 | fn main_fn_where_clauses_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> { |
203 | if !def_id.is_local() { | |
204 | return None; | |
205 | } | |
206 | let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local()); | |
207 | match tcx.hir().find(hir_id) { | |
208 | Some(Node::Item(hir::Item { kind: hir::ItemKind::Fn(_, ref generics, _), .. })) => { | |
209 | generics.where_clause.span() | |
210 | } | |
211 | _ => { | |
212 | span_bug!(tcx.def_span(def_id), "main has a non-function type"); | |
213 | } | |
214 | } | |
215 | } | |
1a4d82fc | 216 | |
cdc7bbd5 XL |
217 | fn main_fn_asyncness_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> { |
218 | if !def_id.is_local() { | |
219 | return None; | |
1a4d82fc | 220 | } |
cdc7bbd5 XL |
221 | let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local()); |
222 | match tcx.hir().find(hir_id) { | |
223 | Some(Node::Item(hir::Item { span: item_span, .. })) => { | |
224 | Some(tcx.sess.source_map().guess_head_span(*item_span)) | |
225 | } | |
226 | _ => { | |
227 | span_bug!(tcx.def_span(def_id), "main has a non-function type"); | |
228 | } | |
1a4d82fc JJ |
229 | } |
230 | } | |
1a4d82fc | 231 | |
cdc7bbd5 XL |
232 | fn main_fn_return_type_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> { |
233 | if !def_id.is_local() { | |
234 | return None; | |
235 | } | |
236 | let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local()); | |
237 | match tcx.hir().find(hir_id) { | |
238 | Some(Node::Item(hir::Item { kind: hir::ItemKind::Fn(ref fn_sig, _, _), .. })) => { | |
239 | Some(fn_sig.decl.output.span()) | |
240 | } | |
241 | _ => { | |
242 | span_bug!(tcx.def_span(def_id), "main has a non-function type"); | |
243 | } | |
244 | } | |
245 | } | |
246 | ||
247 | let mut error = false; | |
248 | let main_diagnostics_hir_id = main_fn_diagnostics_hir_id(tcx, main_def_id, main_span); | |
249 | let main_fn_generics = tcx.generics_of(main_def_id); | |
250 | let main_fn_predicates = tcx.predicates_of(main_def_id); | |
251 | if main_fn_generics.count() != 0 || !main_fnsig.bound_vars().is_empty() { | |
252 | let generics_param_span = main_fn_generics_params_span(tcx, main_def_id); | |
253 | let msg = "`main` function is not allowed to have generic \ | |
254 | parameters"; | |
255 | let mut diag = | |
256 | struct_span_err!(tcx.sess, generics_param_span.unwrap_or(main_span), E0131, "{}", msg); | |
257 | if let Some(generics_param_span) = generics_param_span { | |
258 | let label = "`main` cannot have generic parameters".to_string(); | |
259 | diag.span_label(generics_param_span, label); | |
260 | } | |
261 | diag.emit(); | |
262 | error = true; | |
263 | } else if !main_fn_predicates.predicates.is_empty() { | |
264 | // generics may bring in implicit predicates, so we skip this check if generics is present. | |
265 | let generics_where_clauses_span = main_fn_where_clauses_span(tcx, main_def_id); | |
266 | let mut diag = struct_span_err!( | |
267 | tcx.sess, | |
268 | generics_where_clauses_span.unwrap_or(main_span), | |
269 | E0646, | |
270 | "`main` function is not allowed to have a `where` clause" | |
271 | ); | |
272 | if let Some(generics_where_clauses_span) = generics_where_clauses_span { | |
273 | diag.span_label(generics_where_clauses_span, "`main` cannot have a `where` clause"); | |
274 | } | |
275 | diag.emit(); | |
276 | error = true; | |
277 | } | |
278 | ||
279 | let main_asyncness = tcx.asyncness(main_def_id); | |
280 | if let hir::IsAsync::Async = main_asyncness { | |
281 | let mut diag = struct_span_err!( | |
282 | tcx.sess, | |
283 | main_span, | |
284 | E0752, | |
285 | "`main` function is not allowed to be `async`" | |
286 | ); | |
287 | let asyncness_span = main_fn_asyncness_span(tcx, main_def_id); | |
288 | if let Some(asyncness_span) = asyncness_span { | |
289 | diag.span_label(asyncness_span, "`main` function is not allowed to be `async`"); | |
290 | } | |
291 | diag.emit(); | |
292 | error = true; | |
293 | } | |
294 | ||
295 | for attr in tcx.get_attrs(main_def_id) { | |
94222f64 | 296 | if attr.has_name(sym::track_caller) { |
cdc7bbd5 XL |
297 | tcx.sess |
298 | .struct_span_err( | |
299 | attr.span, | |
300 | "`main` function is not allowed to be `#[track_caller]`", | |
301 | ) | |
302 | .span_label(main_span, "`main` function is not allowed to be `#[track_caller]`") | |
303 | .emit(); | |
304 | error = true; | |
305 | } | |
306 | } | |
307 | ||
308 | if error { | |
309 | return; | |
310 | } | |
311 | ||
312 | let expected_return_type; | |
313 | if let Some(term_id) = tcx.lang_items().termination() { | |
314 | let return_ty = main_fnsig.output(); | |
315 | let return_ty_span = main_fn_return_type_span(tcx, main_def_id).unwrap_or(main_span); | |
316 | if !return_ty.bound_vars().is_empty() { | |
317 | let msg = "`main` function return type is not allowed to have generic \ | |
318 | parameters" | |
319 | .to_owned(); | |
320 | struct_span_err!(tcx.sess, return_ty_span, E0131, "{}", msg).emit(); | |
321 | error = true; | |
322 | } | |
323 | let return_ty = return_ty.skip_binder(); | |
324 | tcx.infer_ctxt().enter(|infcx| { | |
325 | let cause = traits::ObligationCause::new( | |
326 | return_ty_span, | |
327 | main_diagnostics_hir_id, | |
328 | ObligationCauseCode::MainFunctionType, | |
329 | ); | |
330 | let mut fulfillment_cx = traits::FulfillmentContext::new(); | |
331 | fulfillment_cx.register_bound(&infcx, ty::ParamEnv::empty(), return_ty, term_id, cause); | |
332 | if let Err(err) = fulfillment_cx.select_all_or_error(&infcx) { | |
333 | infcx.report_fulfillment_errors(&err, None, false); | |
334 | error = true; | |
335 | } | |
336 | }); | |
337 | // now we can take the return type of the given main function | |
338 | expected_return_type = main_fnsig.output(); | |
339 | } else { | |
340 | // standard () main return type | |
341 | expected_return_type = ty::Binder::dummy(tcx.mk_unit()); | |
342 | } | |
343 | ||
344 | if error { | |
345 | return; | |
346 | } | |
347 | ||
348 | let se_ty = tcx.mk_fn_ptr(expected_return_type.map_bound(|expected_return_type| { | |
349 | tcx.mk_fn_sig(iter::empty(), expected_return_type, false, hir::Unsafety::Normal, Abi::Rust) | |
350 | })); | |
351 | ||
352 | require_same_types( | |
353 | tcx, | |
354 | &ObligationCause::new( | |
355 | main_span, | |
356 | main_diagnostics_hir_id, | |
357 | ObligationCauseCode::MainFunctionType, | |
358 | ), | |
359 | se_ty, | |
360 | tcx.mk_fn_ptr(main_fnsig), | |
361 | ); | |
362 | } | |
363 | fn check_start_fn_ty(tcx: TyCtxt<'_>, start_def_id: DefId) { | |
364 | let start_def_id = start_def_id.expect_local(); | |
3dfed10e | 365 | let start_id = tcx.hir().local_def_id_to_hir_id(start_def_id); |
9fa01778 | 366 | let start_span = tcx.def_span(start_def_id); |
7cac9316 | 367 | let start_t = tcx.type_of(start_def_id); |
1b1a35ee | 368 | match start_t.kind() { |
b7449926 | 369 | ty::FnDef(..) => { |
dc9dc135 | 370 | if let Some(Node::Item(it)) = tcx.hir().find(start_id) { |
ba9703b0 | 371 | if let hir::ItemKind::Fn(ref sig, ref generics, _) = it.kind { |
0bf4aa26 XL |
372 | let mut error = false; |
373 | if !generics.params.is_empty() { | |
dfeec247 XL |
374 | struct_span_err!( |
375 | tcx.sess, | |
376 | generics.span, | |
377 | E0132, | |
378 | "start function is not allowed to have type parameters" | |
379 | ) | |
380 | .span_label(generics.span, "start function cannot have type parameters") | |
381 | .emit(); | |
0bf4aa26 XL |
382 | error = true; |
383 | } | |
384 | if let Some(sp) = generics.where_clause.span() { | |
dfeec247 XL |
385 | struct_span_err!( |
386 | tcx.sess, | |
387 | sp, | |
388 | E0647, | |
389 | "start function is not allowed to have a `where` clause" | |
390 | ) | |
391 | .span_label(sp, "start function cannot have a `where` clause") | |
392 | .emit(); | |
0bf4aa26 XL |
393 | error = true; |
394 | } | |
ba9703b0 XL |
395 | if let hir::IsAsync::Async = sig.header.asyncness { |
396 | let span = tcx.sess.source_map().guess_head_span(it.span); | |
397 | struct_span_err!( | |
398 | tcx.sess, | |
399 | span, | |
400 | E0752, | |
f9652781 | 401 | "`start` is not allowed to be `async`" |
ba9703b0 | 402 | ) |
f9652781 | 403 | .span_label(span, "`start` is not allowed to be `async`") |
ba9703b0 XL |
404 | .emit(); |
405 | error = true; | |
406 | } | |
f9652781 | 407 | |
6a06907d XL |
408 | let attrs = tcx.hir().attrs(start_id); |
409 | for attr in attrs { | |
94222f64 | 410 | if attr.has_name(sym::track_caller) { |
f9652781 XL |
411 | tcx.sess |
412 | .struct_span_err( | |
413 | attr.span, | |
414 | "`start` is not allowed to be `#[track_caller]`", | |
415 | ) | |
416 | .span_label( | |
417 | start_span, | |
418 | "`start` is not allowed to be `#[track_caller]`", | |
419 | ) | |
420 | .emit(); | |
421 | error = true; | |
422 | } | |
423 | } | |
424 | ||
0bf4aa26 XL |
425 | if error { |
426 | return; | |
1a4d82fc JJ |
427 | } |
428 | } | |
1a4d82fc JJ |
429 | } |
430 | ||
29967ef6 | 431 | let se_ty = tcx.mk_fn_ptr(ty::Binder::dummy(tcx.mk_fn_sig( |
dfeec247 XL |
432 | [tcx.types.isize, tcx.mk_imm_ptr(tcx.mk_imm_ptr(tcx.types.u8))].iter().cloned(), |
433 | tcx.types.isize, | |
434 | false, | |
435 | hir::Unsafety::Normal, | |
436 | Abi::Rust, | |
437 | ))); | |
1a4d82fc | 438 | |
5bcae85e | 439 | require_same_types( |
8bb4bdeb | 440 | tcx, |
476ff2be | 441 | &ObligationCause::new(start_span, start_id, ObligationCauseCode::StartFunctionType), |
c30ab7b3 | 442 | se_ty, |
dfeec247 XL |
443 | tcx.mk_fn_ptr(tcx.fn_sig(start_def_id)), |
444 | ); | |
1a4d82fc JJ |
445 | } |
446 | _ => { | |
dfeec247 | 447 | span_bug!(start_span, "start has a non-function type: found `{}`", start_t); |
1a4d82fc JJ |
448 | } |
449 | } | |
450 | } | |
451 | ||
416331ca | 452 | fn check_for_entry_fn(tcx: TyCtxt<'_>) { |
17df50a5 | 453 | match tcx.entry_fn(()) { |
9fa01778 XL |
454 | Some((def_id, EntryFnType::Main)) => check_main_fn_ty(tcx, def_id), |
455 | Some((def_id, EntryFnType::Start)) => check_start_fn_ty(tcx, def_id), | |
456 | _ => {} | |
1a4d82fc JJ |
457 | } |
458 | } | |
459 | ||
f035d41b | 460 | pub fn provide(providers: &mut Providers) { |
8bb4bdeb XL |
461 | collect::provide(providers); |
462 | coherence::provide(providers); | |
463 | check::provide(providers); | |
7cac9316 | 464 | variance::provide(providers); |
abe05a73 | 465 | outlives::provide(providers); |
9fa01778 | 466 | impl_wf_check::provide(providers); |
136023e0 | 467 | hir_wf_check::provide(providers); |
8bb4bdeb XL |
468 | } |
469 | ||
416331ca | 470 | pub fn check_crate(tcx: TyCtxt<'_>) -> Result<(), ErrorReported> { |
dfeec247 | 471 | let _prof_timer = tcx.sess.timer("type_check_crate"); |
b7449926 | 472 | |
1a4d82fc JJ |
473 | // this ensures that later parts of type checking can assume that items |
474 | // have valid types and not error | |
1b1a35ee | 475 | // FIXME(matthewjasper) We shouldn't need to use `track_errors`. |
54a0048b | 476 | tcx.sess.track_errors(|| { |
dfeec247 | 477 | tcx.sess.time("type_collecting", || { |
532ac7d7 | 478 | for &module in tcx.hir().krate().modules.keys() { |
6a06907d | 479 | tcx.ensure().collect_mod_item_types(module); |
532ac7d7 XL |
480 | } |
481 | }); | |
54a0048b | 482 | })?; |
1a4d82fc | 483 | |
9fa01778 XL |
484 | if tcx.features().rustc_attrs { |
485 | tcx.sess.track_errors(|| { | |
dfeec247 | 486 | tcx.sess.time("outlives_testing", || outlives::test::test_inferred_outlives(tcx)); |
9fa01778 XL |
487 | })?; |
488 | } | |
abe05a73 | 489 | |
476ff2be | 490 | tcx.sess.track_errors(|| { |
dfeec247 | 491 | tcx.sess.time("impl_wf_inference", || impl_wf_check::impl_wf_check(tcx)); |
476ff2be SL |
492 | })?; |
493 | ||
54a0048b | 494 | tcx.sess.track_errors(|| { |
dfeec247 | 495 | tcx.sess.time("coherence_checking", || coherence::check_coherence(tcx)); |
54a0048b | 496 | })?; |
1a4d82fc | 497 | |
9fa01778 XL |
498 | if tcx.features().rustc_attrs { |
499 | tcx.sess.track_errors(|| { | |
dfeec247 | 500 | tcx.sess.time("variance_testing", || variance::test::test_variance(tcx)); |
9fa01778 XL |
501 | })?; |
502 | } | |
7cac9316 | 503 | |
dc9dc135 | 504 | tcx.sess.track_errors(|| { |
dfeec247 | 505 | tcx.sess.time("wf_checking", || check::check_wf_new(tcx)); |
dc9dc135 | 506 | })?; |
1a4d82fc | 507 | |
3dfed10e | 508 | // NOTE: This is copy/pasted in librustdoc/core.rs and should be kept in sync. |
dfeec247 | 509 | tcx.sess.time("item_types_checking", || { |
48663c56 | 510 | for &module in tcx.hir().krate().modules.keys() { |
6a06907d | 511 | tcx.ensure().check_mod_item_types(module); |
48663c56 XL |
512 | } |
513 | }); | |
e9174d1e | 514 | |
17df50a5 | 515 | tcx.sess.time("item_bodies_checking", || tcx.typeck_item_bodies(())); |
e9174d1e | 516 | |
a7813a04 | 517 | check_unused::check_crate(tcx); |
8bb4bdeb | 518 | check_for_entry_fn(tcx); |
7453a54e | 519 | |
dfeec247 | 520 | if tcx.sess.err_count() == 0 { Ok(()) } else { Err(ErrorReported) } |
1a4d82fc | 521 | } |
d9579d0f | 522 | |
532ac7d7 | 523 | /// A quasi-deprecated helper used in rustdoc and clippy to get |
7cac9316 | 524 | /// the type from a HIR node. |
dfeec247 | 525 | pub fn hir_ty_to_ty<'tcx>(tcx: TyCtxt<'tcx>, hir_ty: &hir::Ty<'_>) -> Ty<'tcx> { |
dc9dc135 XL |
526 | // In case there are any projections, etc., find the "environment" |
527 | // def-ID that will be used to determine the traits/predicates in | |
7cac9316 | 528 | // scope. This is derived from the enclosing item-like thing. |
532ac7d7 | 529 | let env_node_id = tcx.hir().get_parent_item(hir_ty.hir_id); |
416331ca | 530 | let env_def_id = tcx.hir().local_def_id(env_node_id); |
f9f354fc | 531 | let item_cx = self::collect::ItemCtxt::new(tcx, env_def_id.to_def_id()); |
cdc7bbd5 | 532 | <dyn AstConv<'_>>::ast_ty_to_ty(&item_cx, hir_ty) |
ff7c6d11 XL |
533 | } |
534 | ||
dc9dc135 XL |
535 | pub fn hir_trait_to_predicates<'tcx>( |
536 | tcx: TyCtxt<'tcx>, | |
dfeec247 | 537 | hir_trait: &hir::TraitRef<'_>, |
ba9703b0 | 538 | self_ty: Ty<'tcx>, |
416331ca | 539 | ) -> Bounds<'tcx> { |
dc9dc135 XL |
540 | // In case there are any projections, etc., find the "environment" |
541 | // def-ID that will be used to determine the traits/predicates in | |
ff7c6d11 | 542 | // scope. This is derived from the enclosing item-like thing. |
532ac7d7 | 543 | let env_hir_id = tcx.hir().get_parent_item(hir_trait.hir_ref_id); |
416331ca | 544 | let env_def_id = tcx.hir().local_def_id(env_hir_id); |
f9f354fc | 545 | let item_cx = self::collect::ItemCtxt::new(tcx, env_def_id.to_def_id()); |
dc9dc135 | 546 | let mut bounds = Bounds::default(); |
cdc7bbd5 | 547 | let _ = <dyn AstConv<'_>>::instantiate_poly_trait_ref( |
dfeec247 XL |
548 | &item_cx, |
549 | hir_trait, | |
550 | DUMMY_SP, | |
94222f64 | 551 | ty::BoundConstness::NotConst, |
ba9703b0 | 552 | self_ty, |
dfeec247 XL |
553 | &mut bounds, |
554 | true, | |
ff7c6d11 | 555 | ); |
0bf4aa26 | 556 | |
416331ca | 557 | bounds |
7cac9316 | 558 | } |