2 use crate::infer::canonical::{self, Canonical};
3 use crate::lint::LintExpectation;
4 use crate::metadata::ModChild;
5 use crate::middle::codegen_fn_attrs::CodegenFnAttrs;
6 use crate::middle::exported_symbols::{ExportedSymbol, SymbolExportInfo};
7 use crate::middle::lib_features::LibFeatures;
8 use crate::middle::privacy::AccessLevels;
9 use crate::middle::resolve_lifetime::{ObjectLifetimeDefault, Region, ResolveLifetimes};
10 use crate::middle::stability::{self, DeprecationEntry};
12 use crate::mir::interpret::GlobalId;
13 use crate::mir::interpret::{
14 ConstValue, EvalToAllocationRawResult, EvalToConstValueResult, EvalToValTreeResult,
16 use crate::mir::interpret::{LitToConstError, LitToConstInput};
17 use crate::mir::mono::CodegenUnit;
19 use crate::traits::query::{
20 CanonicalPredicateGoal, CanonicalProjectionGoal, CanonicalTyGoal,
21 CanonicalTypeOpAscribeUserTypeGoal, CanonicalTypeOpEqGoal, CanonicalTypeOpNormalizeGoal,
22 CanonicalTypeOpProvePredicateGoal, CanonicalTypeOpSubtypeGoal, NoSolution,
24 use crate::traits::query::{
25 DropckConstraint, DropckOutlivesResult, MethodAutoderefStepsResult, NormalizationResult,
28 use crate::traits::specialization_graph;
29 use crate::traits::{self, ImplSource};
30 use crate::ty::fast_reject::SimplifiedType;
31 use crate::ty::layout::TyAndLayout;
32 use crate::ty::subst::{GenericArg, SubstsRef};
33 use crate::ty::util::AlwaysRequiresDrop;
34 use crate::ty::GeneratorDiagnosticData;
35 use crate::ty::{self, AdtSizedConstraint, CrateInherentImpls, ParamEnvAnd, Ty, TyCtxt};
37 use rustc_ast::expand::allocator::AllocatorKind;
38 use rustc_attr as attr;
39 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
40 use rustc_data_structures::steal::Steal;
41 use rustc_data_structures::svh::Svh;
42 use rustc_data_structures::sync::Lrc;
43 use rustc_errors::ErrorGuaranteed;
45 use rustc_hir::def::DefKind;
46 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIdSet, LocalDefId};
47 use rustc_hir::hir_id::HirId;
48 use rustc_hir::lang_items::{LangItem, LanguageItems};
49 use rustc_hir::{Crate, ItemLocalId, TraitCandidate};
50 use rustc_index::{bit_set::FiniteBitSet, vec::IndexVec};
51 use rustc_session::config::{EntryFnType, OptLevel, OutputFilenames, SymbolManglingVersion};
52 use rustc_session::cstore::{CrateDepKind, CrateSource};
53 use rustc_session::cstore::{ExternCrate, ForeignModule, LinkagePreference, NativeLib};
54 use rustc_session::lint::LintExpectationId;
55 use rustc_session::utils::NativeLibKind;
56 use rustc_session::Limits;
57 use rustc_span::symbol::Symbol;
58 use rustc_span::{Span, DUMMY_SP};
59 use rustc_target::abi;
60 use rustc_target::spec::PanicStrategy;
62 use std::path::PathBuf;
65 pub(crate) use rustc_query_system::query::QueryJobId;
66 use rustc_query_system::query::*;
68 #[derive(Copy, Clone)]
69 pub struct TyCtxtAt<'tcx> {
70 pub tcx: TyCtxt<'tcx>,
74 impl<'tcx> Deref for TyCtxtAt<'tcx> {
75 type Target = TyCtxt<'tcx>;
77 fn deref(&self) -> &Self::Target {
82 #[derive(Copy, Clone)]
83 pub struct TyCtxtEnsure<'tcx> {
84 pub tcx: TyCtxt<'tcx>,
87 impl<'tcx> TyCtxt<'tcx> {
88 /// Returns a transparent wrapper for `TyCtxt`, which ensures queries
89 /// are executed instead of just returning their results.
91 pub fn ensure(self) -> TyCtxtEnsure<'tcx> {
92 TyCtxtEnsure { tcx: self }
95 /// Returns a transparent wrapper for `TyCtxt` which uses
96 /// `span` as the location of queries performed through it.
98 pub fn at(self, span: Span) -> TyCtxtAt<'tcx> {
99 TyCtxtAt { tcx: self, span }
102 pub fn try_mark_green(self, dep_node: &dep_graph::DepNode) -> bool {
103 self.queries.try_mark_green(self, dep_node)
107 /// Helper for `TyCtxtEnsure` to avoid a closure.
111 /// Helper to ensure that queries only return `Copy` types.
113 fn copy<T: Copy>(x: &T) -> T {
117 macro_rules! query_helper_param_ty {
118 (DefId) => { impl IntoQueryParam<DefId> };
122 macro_rules! query_storage {
123 ([][$K:ty, $V:ty]) => {
124 <DefaultCacheSelector as CacheSelector<$K, $V>>::Cache
126 ([(arena_cache) $($rest:tt)*][$K:ty, $V:ty]) => {
127 <ArenaCacheSelector<'tcx> as CacheSelector<$K, $V>>::Cache
129 ([$other:tt $($modifiers:tt)*][$($args:tt)*]) => {
130 query_storage!([$($modifiers)*][$($args)*])
134 macro_rules! separate_provide_extern_decl {
135 ([][$name:ident]) => {
138 ([(separate_provide_extern) $($rest:tt)*][$name:ident]) => {
141 query_keys::$name<'tcx>,
142 ) -> query_values::$name<'tcx>
144 ([$other:tt $($modifiers:tt)*][$($args:tt)*]) => {
145 separate_provide_extern_decl!([$($modifiers)*][$($args)*])
149 macro_rules! separate_provide_extern_default {
150 ([][$name:ident]) => {
153 ([(separate_provide_extern) $($rest:tt)*][$name:ident]) => {
155 "`tcx.{}({:?})` unsupported by its crate; \
156 perhaps the `{}` query was never assigned a provider function",
162 ([$other:tt $($modifiers:tt)*][$($args:tt)*]) => {
163 separate_provide_extern_default!([$($modifiers)*][$($args)*])
167 macro_rules! opt_remap_env_constness {
168 ([][$name:ident]) => {};
169 ([(remap_env_constness) $($rest:tt)*][$name:ident]) => {
170 let $name = $name.without_const();
172 ([$other:tt $($modifiers:tt)*][$name:ident]) => {
173 opt_remap_env_constness!([$($modifiers)*][$name])
177 macro_rules! define_callbacks {
180 [$($modifiers:tt)*] fn $name:ident($($K:tt)*) -> $V:ty,)*) => {
182 // HACK(eddyb) this is like the `impl QueryConfig for queries::$name`
183 // below, but using type aliases instead of associated types, to bypass
184 // the limitations around normalizing under HRTB - for example, this:
185 // `for<'tcx> fn(...) -> <queries::$name<'tcx> as QueryConfig<TyCtxt<'tcx>>>::Value`
186 // doesn't currently normalize to `for<'tcx> fn(...) -> query_values::$name<'tcx>`.
187 // This is primarily used by the `provide!` macro in `rustc_metadata`.
188 #[allow(nonstandard_style, unused_lifetimes)]
192 $(pub type $name<'tcx> = $($K)*;)*
194 #[allow(nonstandard_style, unused_lifetimes)]
195 pub mod query_values {
198 $(pub type $name<'tcx> = $V;)*
200 #[allow(nonstandard_style, unused_lifetimes)]
201 pub mod query_storage {
204 $(pub type $name<'tcx> = query_storage!([$($modifiers)*][$($K)*, $V]);)*
206 #[allow(nonstandard_style, unused_lifetimes)]
207 pub mod query_stored {
210 $(pub type $name<'tcx> = <query_storage::$name<'tcx> as QueryStorage>::Stored;)*
214 pub struct QueryCaches<'tcx> {
215 $($(#[$attr])* pub $name: query_storage::$name<'tcx>,)*
218 impl<'tcx> TyCtxtEnsure<'tcx> {
221 pub fn $name(self, key: query_helper_param_ty!($($K)*)) {
222 let key = key.into_query_param();
223 opt_remap_env_constness!([$($modifiers)*][key]);
225 let cached = try_get_cached(self.tcx, &self.tcx.query_caches.$name, &key, noop);
232 self.tcx.queries.$name(self.tcx, DUMMY_SP, key, QueryMode::Ensure);
236 impl<'tcx> TyCtxt<'tcx> {
240 pub fn $name(self, key: query_helper_param_ty!($($K)*)) -> query_stored::$name<'tcx>
242 self.at(DUMMY_SP).$name(key)
246 impl<'tcx> TyCtxtAt<'tcx> {
249 pub fn $name(self, key: query_helper_param_ty!($($K)*)) -> query_stored::$name<'tcx>
251 let key = key.into_query_param();
252 opt_remap_env_constness!([$($modifiers)*][key]);
254 let cached = try_get_cached(self.tcx, &self.tcx.query_caches.$name, &key, copy);
257 Ok(value) => return value,
261 self.tcx.queries.$name(self.tcx, self.span, key, QueryMode::Get).unwrap()
265 pub struct Providers {
266 $(pub $name: for<'tcx> fn(
268 query_keys::$name<'tcx>,
269 ) -> query_values::$name<'tcx>,)*
272 pub struct ExternProviders {
273 $(pub $name: separate_provide_extern_decl!([$($modifiers)*][$name]),)*
276 impl Default for Providers {
277 fn default() -> Self {
279 $($name: |_, key| bug!(
280 "`tcx.{}({:?})` unsupported by its crate; \
281 perhaps the `{}` query was never assigned a provider function",
290 impl Default for ExternProviders {
291 fn default() -> Self {
293 $($name: separate_provide_extern_default!([$($modifiers)*][$name]),)*
298 impl Copy for Providers {}
299 impl Clone for Providers {
300 fn clone(&self) -> Self { *self }
303 impl Copy for ExternProviders {}
304 impl Clone for ExternProviders {
305 fn clone(&self) -> Self { *self }
308 pub trait QueryEngine<'tcx>: rustc_data_structures::sync::Sync {
309 fn as_any(&'tcx self) -> &'tcx dyn std::any::Any;
311 fn try_mark_green(&'tcx self, tcx: TyCtxt<'tcx>, dep_node: &dep_graph::DepNode) -> bool;
318 key: query_keys::$name<'tcx>,
320 ) -> Option<query_stored::$name<'tcx>>;)*
325 // Each of these queries corresponds to a function pointer field in the
326 // `Providers` struct for requesting a value of that type, and a method
327 // on `tcx: TyCtxt` (and `tcx.at(span)`) for doing that request in a way
328 // which memoizes and does dep-graph tracking, wrapping around the actual
329 // `Providers` that the driver creates (using several `rustc_*` crates).
331 // The result type of each query must implement `Clone`, and additionally
332 // `ty::query::values::Value`, which produces an appropriate placeholder
333 // (error) value if the query resulted in a query cycle.
334 // Queries marked with `fatal_cycle` do not need the latter implementation,
335 // as they will raise an fatal error on query cycles instead.
337 rustc_query_append! { define_callbacks! }
340 use super::{DefId, LocalDefId};
342 /// An analogue of the `Into` trait that's intended only for query parameters.
344 /// This exists to allow queries to accept either `DefId` or `LocalDefId` while requiring that the
345 /// user call `to_def_id` to convert between them everywhere else.
346 pub trait IntoQueryParam<P> {
347 fn into_query_param(self) -> P;
350 impl<P> IntoQueryParam<P> for P {
352 fn into_query_param(self) -> P {
357 impl<'a, P: Copy> IntoQueryParam<P> for &'a P {
359 fn into_query_param(self) -> P {
364 impl IntoQueryParam<DefId> for LocalDefId {
366 fn into_query_param(self) -> DefId {
372 use sealed::IntoQueryParam;
374 impl<'tcx> TyCtxt<'tcx> {
375 pub fn def_kind(self, def_id: impl IntoQueryParam<DefId>) -> DefKind {
376 let def_id = def_id.into_query_param();
377 self.opt_def_kind(def_id)
378 .unwrap_or_else(|| bug!("def_kind: unsupported node: {:?}", def_id))
382 impl<'tcx> TyCtxtAt<'tcx> {
383 pub fn def_kind(self, def_id: impl IntoQueryParam<DefId>) -> DefKind {
384 let def_id = def_id.into_query_param();
385 self.opt_def_kind(def_id)
386 .unwrap_or_else(|| bug!("def_kind: unsupported node: {:?}", def_id))