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context.rs
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//! Type context book-keeping.
#![allow(rustc::usage_of_ty_tykind)]
pub mod tls;
pub use rustc_type_ir::lift::Lift;
use crate::arena::Arena;
use crate::dep_graph::{DepGraph, DepKindStruct};
use crate::infer::canonical::{CanonicalParamEnvCache, CanonicalVarInfo, CanonicalVarInfos};
use crate::lint::lint_level;
use crate::metadata::ModChild;
use crate::middle::codegen_fn_attrs::CodegenFnAttrs;
use crate::middle::resolve_bound_vars;
use crate::middle::stability;
use crate::mir::interpret::{self, Allocation, ConstAllocation};
use crate::mir::{Body, Local, Place, PlaceElem, ProjectionKind, Promoted};
use crate::query::plumbing::QuerySystem;
use crate::query::LocalCrate;
use crate::query::Providers;
use crate::query::{IntoQueryParam, TyCtxtAt};
use crate::thir::Thir;
use crate::traits;
use crate::traits::solve;
use crate::traits::solve::{
ExternalConstraints, ExternalConstraintsData, PredefinedOpaques, PredefinedOpaquesData,
};
use crate::ty::predicate::ExistentialPredicateStableCmpExt as _;
use crate::ty::{
self, AdtDef, AdtDefData, AdtKind, Binder, Clause, Clauses, Const, ConstData,
GenericParamDefKind, ImplPolarity, List, ListWithCachedTypeInfo, ParamConst, ParamTy, Pattern,
PatternKind, PolyExistentialPredicate, PolyFnSig, Predicate, PredicateKind, PredicatePolarity,
Region, RegionKind, ReprOptions, TraitObjectVisitor, Ty, TyKind, TyVid, Visibility,
};
use crate::ty::{GenericArg, GenericArgs, GenericArgsRef};
use rustc_ast::{self as ast, attr};
use rustc_data_structures::defer;
use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::intern::Interned;
use rustc_data_structures::profiling::SelfProfilerRef;
use rustc_data_structures::sharded::{IntoPointer, ShardedHashMap};
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_data_structures::steal::Steal;
use rustc_data_structures::sync::{self, FreezeReadGuard, Lock, Lrc, RwLock, WorkerLocal};
#[cfg(parallel_compiler)]
use rustc_data_structures::sync::{DynSend, DynSync};
use rustc_data_structures::unord::UnordSet;
use rustc_errors::{
Applicability, Diag, DiagCtxt, DiagMessage, ErrorGuaranteed, LintDiagnostic, MultiSpan,
};
use rustc_hir as hir;
use rustc_hir::def::DefKind;
use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
use rustc_hir::definitions::Definitions;
use rustc_hir::intravisit::Visitor;
use rustc_hir::lang_items::LangItem;
use rustc_hir::{HirId, Node, TraitCandidate};
use rustc_index::IndexVec;
use rustc_macros::{HashStable, TyDecodable, TyEncodable};
use rustc_query_system::dep_graph::DepNodeIndex;
use rustc_query_system::ich::StableHashingContext;
use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
use rustc_session::config::CrateType;
use rustc_session::cstore::{CrateStoreDyn, Untracked};
use rustc_session::lint::Lint;
use rustc_session::{Limit, MetadataKind, Session};
use rustc_span::def_id::{DefPathHash, StableCrateId, CRATE_DEF_ID};
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{Span, DUMMY_SP};
use rustc_target::abi::{FieldIdx, Layout, LayoutS, TargetDataLayout, VariantIdx};
use rustc_target::spec::abi;
use rustc_type_ir::TyKind::*;
use rustc_type_ir::WithCachedTypeInfo;
use rustc_type_ir::{CollectAndApply, Interner, TypeFlags};
use std::assert_matches::assert_matches;
use std::borrow::Borrow;
use std::cmp::Ordering;
use std::fmt;
use std::hash::{Hash, Hasher};
use std::iter;
use std::marker::PhantomData;
use std::mem;
use std::ops::{Bound, Deref};
#[allow(rustc::usage_of_ty_tykind)]
impl<'tcx> Interner for TyCtxt<'tcx> {
type DefId = DefId;
type AdtDef = ty::AdtDef<'tcx>;
type GenericArgs = ty::GenericArgsRef<'tcx>;
type OwnItemArgs = &'tcx [ty::GenericArg<'tcx>];
type GenericArg = ty::GenericArg<'tcx>;
type Term = ty::Term<'tcx>;
type BoundVarKinds = &'tcx List<ty::BoundVariableKind>;
type BoundVarKind = ty::BoundVariableKind;
type CanonicalVars = CanonicalVarInfos<'tcx>;
type PredefinedOpaques = solve::PredefinedOpaques<'tcx>;
type DefiningOpaqueTypes = &'tcx ty::List<LocalDefId>;
type ExternalConstraints = ExternalConstraints<'tcx>;
type GoalEvaluationSteps = &'tcx [solve::inspect::GoalEvaluationStep<TyCtxt<'tcx>>];
type Ty = Ty<'tcx>;
type Tys = &'tcx List<Ty<'tcx>>;
type FnInputTys = &'tcx [Ty<'tcx>];
type ParamTy = ParamTy;
type BoundTy = ty::BoundTy;
type PlaceholderTy = ty::PlaceholderType;
type ErrorGuaranteed = ErrorGuaranteed;
type BoundExistentialPredicates = &'tcx List<PolyExistentialPredicate<'tcx>>;
type PolyFnSig = PolyFnSig<'tcx>;
type AllocId = crate::mir::interpret::AllocId;
type Pat = Pattern<'tcx>;
type Safety = hir::Safety;
type Abi = abi::Abi;
type Const = ty::Const<'tcx>;
type PlaceholderConst = ty::PlaceholderConst;
type ParamConst = ty::ParamConst;
type BoundConst = ty::BoundVar;
type ValueConst = ty::ValTree<'tcx>;
type ExprConst = ty::Expr<'tcx>;
type Region = Region<'tcx>;
type EarlyParamRegion = ty::EarlyParamRegion;
type LateParamRegion = ty::LateParamRegion;
type BoundRegion = ty::BoundRegion;
type PlaceholderRegion = ty::PlaceholderRegion;
type ParamEnv = ty::ParamEnv<'tcx>;
type Predicate = Predicate<'tcx>;
type Clause = Clause<'tcx>;
type Clauses = ty::Clauses<'tcx>;
fn mk_canonical_var_infos(self, infos: &[ty::CanonicalVarInfo<Self>]) -> Self::CanonicalVars {
self.mk_canonical_var_infos(infos)
}
type GenericsOf = &'tcx ty::Generics;
fn generics_of(self, def_id: DefId) -> &'tcx ty::Generics {
self.generics_of(def_id)
}
fn type_of_instantiated(self, def_id: DefId, args: ty::GenericArgsRef<'tcx>) -> Ty<'tcx> {
self.type_of(def_id).instantiate(self, args)
}
fn alias_ty_kind(self, alias: ty::AliasTy<'tcx>) -> ty::AliasTyKind {
match self.def_kind(alias.def_id) {
DefKind::AssocTy => {
if let DefKind::Impl { of_trait: false } = self.def_kind(self.parent(alias.def_id))
{
ty::Inherent
} else {
ty::Projection
}
}
DefKind::OpaqueTy => ty::Opaque,
DefKind::TyAlias => ty::Weak,
kind => bug!("unexpected DefKind in AliasTy: {kind:?}"),
}
}
fn alias_term_kind(self, alias: ty::AliasTerm<'tcx>) -> ty::AliasTermKind {
match self.def_kind(alias.def_id) {
DefKind::AssocTy => {
if let DefKind::Impl { of_trait: false } = self.def_kind(self.parent(alias.def_id))
{
ty::AliasTermKind::InherentTy
} else {
ty::AliasTermKind::ProjectionTy
}
}
DefKind::OpaqueTy => ty::AliasTermKind::OpaqueTy,
DefKind::TyAlias => ty::AliasTermKind::WeakTy,
DefKind::AssocConst => ty::AliasTermKind::ProjectionConst,
DefKind::AnonConst => ty::AliasTermKind::UnevaluatedConst,
kind => bug!("unexpected DefKind in AliasTy: {kind:?}"),
}
}
fn trait_ref_and_own_args_for_alias(
self,
def_id: Self::DefId,
args: Self::GenericArgs,
) -> (rustc_type_ir::TraitRef<Self>, Self::OwnItemArgs) {
assert_matches!(self.def_kind(def_id), DefKind::AssocTy | DefKind::AssocConst);
let trait_def_id = self.parent(def_id);
assert_matches!(self.def_kind(trait_def_id), DefKind::Trait);
let trait_generics = self.generics_of(trait_def_id);
(
ty::TraitRef::new(self, trait_def_id, args.truncate_to(self, trait_generics)),
&args[trait_generics.count()..],
)
}
fn mk_args(self, args: &[Self::GenericArg]) -> Self::GenericArgs {
self.mk_args(args)
}
fn mk_args_from_iter(self, args: impl Iterator<Item = Self::GenericArg>) -> Self::GenericArgs {
self.mk_args_from_iter(args)
}
fn check_and_mk_args(
self,
def_id: DefId,
args: impl IntoIterator<Item: Into<ty::GenericArg<'tcx>>>,
) -> ty::GenericArgsRef<'tcx> {
self.check_and_mk_args(def_id, args)
}
fn parent(self, def_id: Self::DefId) -> Self::DefId {
self.parent(def_id)
}
fn recursion_limit(self) -> usize {
self.recursion_limit().0
}
}
impl<'tcx> rustc_type_ir::inherent::Abi<TyCtxt<'tcx>> for abi::Abi {
fn is_rust(self) -> bool {
matches!(self, abi::Abi::Rust)
}
}
impl<'tcx> rustc_type_ir::inherent::Safety<TyCtxt<'tcx>> for hir::Safety {
fn is_safe(self) -> bool {
matches!(self, hir::Safety::Safe)
}
fn prefix_str(self) -> &'static str {
self.prefix_str()
}
}
type InternedSet<'tcx, T> = ShardedHashMap<InternedInSet<'tcx, T>, ()>;
pub struct CtxtInterners<'tcx> {
/// The arena that types, regions, etc. are allocated from.
arena: &'tcx WorkerLocal<Arena<'tcx>>,
// Specifically use a speedy hash algorithm for these hash sets, since
// they're accessed quite often.
type_: InternedSet<'tcx, WithCachedTypeInfo<TyKind<'tcx>>>,
const_lists: InternedSet<'tcx, List<ty::Const<'tcx>>>,
args: InternedSet<'tcx, GenericArgs<'tcx>>,
type_lists: InternedSet<'tcx, List<Ty<'tcx>>>,
canonical_var_infos: InternedSet<'tcx, List<CanonicalVarInfo<'tcx>>>,
region: InternedSet<'tcx, RegionKind<'tcx>>,
poly_existential_predicates: InternedSet<'tcx, List<PolyExistentialPredicate<'tcx>>>,
predicate: InternedSet<'tcx, WithCachedTypeInfo<ty::Binder<'tcx, PredicateKind<'tcx>>>>,
clauses: InternedSet<'tcx, ListWithCachedTypeInfo<Clause<'tcx>>>,
projs: InternedSet<'tcx, List<ProjectionKind>>,
place_elems: InternedSet<'tcx, List<PlaceElem<'tcx>>>,
const_: InternedSet<'tcx, WithCachedTypeInfo<ConstData<'tcx>>>,
pat: InternedSet<'tcx, PatternKind<'tcx>>,
const_allocation: InternedSet<'tcx, Allocation>,
bound_variable_kinds: InternedSet<'tcx, List<ty::BoundVariableKind>>,
layout: InternedSet<'tcx, LayoutS<FieldIdx, VariantIdx>>,
adt_def: InternedSet<'tcx, AdtDefData>,
external_constraints: InternedSet<'tcx, ExternalConstraintsData<'tcx>>,
predefined_opaques_in_body: InternedSet<'tcx, PredefinedOpaquesData<'tcx>>,
fields: InternedSet<'tcx, List<FieldIdx>>,
local_def_ids: InternedSet<'tcx, List<LocalDefId>>,
captures: InternedSet<'tcx, List<&'tcx ty::CapturedPlace<'tcx>>>,
offset_of: InternedSet<'tcx, List<(VariantIdx, FieldIdx)>>,
}
impl<'tcx> CtxtInterners<'tcx> {
fn new(arena: &'tcx WorkerLocal<Arena<'tcx>>) -> CtxtInterners<'tcx> {
CtxtInterners {
arena,
type_: Default::default(),
const_lists: Default::default(),
args: Default::default(),
type_lists: Default::default(),
region: Default::default(),
poly_existential_predicates: Default::default(),
canonical_var_infos: Default::default(),
predicate: Default::default(),
clauses: Default::default(),
projs: Default::default(),
place_elems: Default::default(),
const_: Default::default(),
pat: Default::default(),
const_allocation: Default::default(),
bound_variable_kinds: Default::default(),
layout: Default::default(),
adt_def: Default::default(),
external_constraints: Default::default(),
predefined_opaques_in_body: Default::default(),
fields: Default::default(),
local_def_ids: Default::default(),
captures: Default::default(),
offset_of: Default::default(),
}
}
/// Interns a type. (Use `mk_*` functions instead, where possible.)
#[allow(rustc::usage_of_ty_tykind)]
#[inline(never)]
fn intern_ty(&self, kind: TyKind<'tcx>, sess: &Session, untracked: &Untracked) -> Ty<'tcx> {
Ty(Interned::new_unchecked(
self.type_
.intern(kind, |kind| {
let flags = super::flags::FlagComputation::for_kind(&kind);
let stable_hash = self.stable_hash(&flags, sess, untracked, &kind);
InternedInSet(self.arena.alloc(WithCachedTypeInfo {
internee: kind,
stable_hash,
flags: flags.flags,
outer_exclusive_binder: flags.outer_exclusive_binder,
}))
})
.0,
))
}
/// Interns a const. (Use `mk_*` functions instead, where possible.)
#[allow(rustc::usage_of_ty_tykind)]
#[inline(never)]
fn intern_const(
&self,
data: ty::ConstData<'tcx>,
sess: &Session,
untracked: &Untracked,
) -> Const<'tcx> {
Const(Interned::new_unchecked(
self.const_
.intern(data, |data: ConstData<'_>| {
let flags = super::flags::FlagComputation::for_const(&data.kind, data.ty);
let stable_hash = self.stable_hash(&flags, sess, untracked, &data);
InternedInSet(self.arena.alloc(WithCachedTypeInfo {
internee: data,
stable_hash,
flags: flags.flags,
outer_exclusive_binder: flags.outer_exclusive_binder,
}))
})
.0,
))
}
fn stable_hash<'a, T: HashStable<StableHashingContext<'a>>>(
&self,
flags: &ty::flags::FlagComputation,
sess: &'a Session,
untracked: &'a Untracked,
val: &T,
) -> Fingerprint {
// It's impossible to hash inference variables (and will ICE), so we don't need to try to cache them.
// Without incremental, we rarely stable-hash types, so let's not do it proactively.
if flags.flags.intersects(TypeFlags::HAS_INFER) || sess.opts.incremental.is_none() {
Fingerprint::ZERO
} else {
let mut hasher = StableHasher::new();
let mut hcx = StableHashingContext::new(sess, untracked);
val.hash_stable(&mut hcx, &mut hasher);
hasher.finish()
}
}
/// Interns a predicate. (Use `mk_predicate` instead, where possible.)
#[inline(never)]
fn intern_predicate(
&self,
kind: Binder<'tcx, PredicateKind<'tcx>>,
sess: &Session,
untracked: &Untracked,
) -> Predicate<'tcx> {
Predicate(Interned::new_unchecked(
self.predicate
.intern(kind, |kind| {
let flags = super::flags::FlagComputation::for_predicate(kind);
let stable_hash = self.stable_hash(&flags, sess, untracked, &kind);
InternedInSet(self.arena.alloc(WithCachedTypeInfo {
internee: kind,
stable_hash,
flags: flags.flags,
outer_exclusive_binder: flags.outer_exclusive_binder,
}))
})
.0,
))
}
fn intern_clauses(&self, clauses: &[Clause<'tcx>]) -> Clauses<'tcx> {
if clauses.is_empty() {
ListWithCachedTypeInfo::empty()
} else {
self.clauses
.intern_ref(clauses, || {
let flags = super::flags::FlagComputation::for_clauses(clauses);
InternedInSet(ListWithCachedTypeInfo::from_arena(
&*self.arena,
flags.into(),
clauses,
))
})
.0
}
}
}
// For these preinterned values, an alternative would be to have
// variable-length vectors that grow as needed. But that turned out to be
// slightly more complex and no faster.
const NUM_PREINTERNED_TY_VARS: u32 = 100;
const NUM_PREINTERNED_FRESH_TYS: u32 = 20;
const NUM_PREINTERNED_FRESH_INT_TYS: u32 = 3;
const NUM_PREINTERNED_FRESH_FLOAT_TYS: u32 = 3;
// This number may seem high, but it is reached in all but the smallest crates.
const NUM_PREINTERNED_RE_VARS: u32 = 500;
const NUM_PREINTERNED_RE_LATE_BOUNDS_I: u32 = 2;
const NUM_PREINTERNED_RE_LATE_BOUNDS_V: u32 = 20;
pub struct CommonTypes<'tcx> {
pub unit: Ty<'tcx>,
pub bool: Ty<'tcx>,
pub char: Ty<'tcx>,
pub isize: Ty<'tcx>,
pub i8: Ty<'tcx>,
pub i16: Ty<'tcx>,
pub i32: Ty<'tcx>,
pub i64: Ty<'tcx>,
pub i128: Ty<'tcx>,
pub usize: Ty<'tcx>,
pub u8: Ty<'tcx>,
pub u16: Ty<'tcx>,
pub u32: Ty<'tcx>,
pub u64: Ty<'tcx>,
pub u128: Ty<'tcx>,
pub f16: Ty<'tcx>,
pub f32: Ty<'tcx>,
pub f64: Ty<'tcx>,
pub f128: Ty<'tcx>,
pub str_: Ty<'tcx>,
pub never: Ty<'tcx>,
pub self_param: Ty<'tcx>,
/// Dummy type used for the `Self` of a `TraitRef` created for converting
/// a trait object, and which gets removed in `ExistentialTraitRef`.
/// This type must not appear anywhere in other converted types.
/// `Infer(ty::FreshTy(0))` does the job.
pub trait_object_dummy_self: Ty<'tcx>,
/// Pre-interned `Infer(ty::TyVar(n))` for small values of `n`.
pub ty_vars: Vec<Ty<'tcx>>,
/// Pre-interned `Infer(ty::FreshTy(n))` for small values of `n`.
pub fresh_tys: Vec<Ty<'tcx>>,
/// Pre-interned `Infer(ty::FreshIntTy(n))` for small values of `n`.
pub fresh_int_tys: Vec<Ty<'tcx>>,
/// Pre-interned `Infer(ty::FreshFloatTy(n))` for small values of `n`.
pub fresh_float_tys: Vec<Ty<'tcx>>,
}
pub struct CommonLifetimes<'tcx> {
/// `ReStatic`
pub re_static: Region<'tcx>,
/// Erased region, used outside of type inference.
pub re_erased: Region<'tcx>,
/// Pre-interned `ReVar(ty::RegionVar(n))` for small values of `n`.
pub re_vars: Vec<Region<'tcx>>,
/// Pre-interned values of the form:
/// `ReBound(DebruijnIndex(i), BoundRegion { var: v, kind: BrAnon })`
/// for small values of `i` and `v`.
pub re_late_bounds: Vec<Vec<Region<'tcx>>>,
}
pub struct CommonConsts<'tcx> {
pub unit: Const<'tcx>,
pub true_: Const<'tcx>,
pub false_: Const<'tcx>,
}
impl<'tcx> CommonTypes<'tcx> {
fn new(
interners: &CtxtInterners<'tcx>,
sess: &Session,
untracked: &Untracked,
) -> CommonTypes<'tcx> {
let mk = |ty| interners.intern_ty(ty, sess, untracked);
let ty_vars =
(0..NUM_PREINTERNED_TY_VARS).map(|n| mk(Infer(ty::TyVar(TyVid::from(n))))).collect();
let fresh_tys: Vec<_> =
(0..NUM_PREINTERNED_FRESH_TYS).map(|n| mk(Infer(ty::FreshTy(n)))).collect();
let fresh_int_tys: Vec<_> =
(0..NUM_PREINTERNED_FRESH_INT_TYS).map(|n| mk(Infer(ty::FreshIntTy(n)))).collect();
let fresh_float_tys: Vec<_> =
(0..NUM_PREINTERNED_FRESH_FLOAT_TYS).map(|n| mk(Infer(ty::FreshFloatTy(n)))).collect();
CommonTypes {
unit: mk(Tuple(List::empty())),
bool: mk(Bool),
char: mk(Char),
never: mk(Never),
isize: mk(Int(ty::IntTy::Isize)),
i8: mk(Int(ty::IntTy::I8)),
i16: mk(Int(ty::IntTy::I16)),
i32: mk(Int(ty::IntTy::I32)),
i64: mk(Int(ty::IntTy::I64)),
i128: mk(Int(ty::IntTy::I128)),
usize: mk(Uint(ty::UintTy::Usize)),
u8: mk(Uint(ty::UintTy::U8)),
u16: mk(Uint(ty::UintTy::U16)),
u32: mk(Uint(ty::UintTy::U32)),
u64: mk(Uint(ty::UintTy::U64)),
u128: mk(Uint(ty::UintTy::U128)),
f16: mk(Float(ty::FloatTy::F16)),
f32: mk(Float(ty::FloatTy::F32)),
f64: mk(Float(ty::FloatTy::F64)),
f128: mk(Float(ty::FloatTy::F128)),
str_: mk(Str),
self_param: mk(ty::Param(ty::ParamTy { index: 0, name: kw::SelfUpper })),
trait_object_dummy_self: fresh_tys[0],
ty_vars,
fresh_tys,
fresh_int_tys,
fresh_float_tys,
}
}
}
impl<'tcx> CommonLifetimes<'tcx> {
fn new(interners: &CtxtInterners<'tcx>) -> CommonLifetimes<'tcx> {
let mk = |r| {
Region(Interned::new_unchecked(
interners.region.intern(r, |r| InternedInSet(interners.arena.alloc(r))).0,
))
};
let re_vars =
(0..NUM_PREINTERNED_RE_VARS).map(|n| mk(ty::ReVar(ty::RegionVid::from(n)))).collect();
let re_late_bounds = (0..NUM_PREINTERNED_RE_LATE_BOUNDS_I)
.map(|i| {
(0..NUM_PREINTERNED_RE_LATE_BOUNDS_V)
.map(|v| {
mk(ty::ReBound(
ty::DebruijnIndex::from(i),
ty::BoundRegion { var: ty::BoundVar::from(v), kind: ty::BrAnon },
))
})
.collect()
})
.collect();
CommonLifetimes {
re_static: mk(ty::ReStatic),
re_erased: mk(ty::ReErased),
re_vars,
re_late_bounds,
}
}
}
impl<'tcx> CommonConsts<'tcx> {
fn new(
interners: &CtxtInterners<'tcx>,
types: &CommonTypes<'tcx>,
sess: &Session,
untracked: &Untracked,
) -> CommonConsts<'tcx> {
let mk_const = |c| {
interners.intern_const(
c, sess, // This is only used to create a stable hashing context.
untracked,
)
};
CommonConsts {
unit: mk_const(ty::ConstData {
kind: ty::ConstKind::Value(ty::ValTree::zst()),
ty: types.unit,
}),
true_: mk_const(ty::ConstData {
kind: ty::ConstKind::Value(ty::ValTree::Leaf(ty::ScalarInt::TRUE)),
ty: types.bool,
}),
false_: mk_const(ty::ConstData {
kind: ty::ConstKind::Value(ty::ValTree::Leaf(ty::ScalarInt::FALSE)),
ty: types.bool,
}),
}
}
}
/// This struct contains information regarding a free parameter region,
/// either a `ReEarlyParam` or `ReLateParam`.
#[derive(Debug)]
pub struct FreeRegionInfo {
/// `LocalDefId` of the free region.
pub def_id: LocalDefId,
/// the bound region corresponding to free region.
pub bound_region: ty::BoundRegionKind,
/// checks if bound region is in Impl Item
pub is_impl_item: bool,
}
/// This struct should only be created by `create_def`.
#[derive(Copy, Clone)]
pub struct TyCtxtFeed<'tcx, KEY: Copy> {
pub tcx: TyCtxt<'tcx>,
// Do not allow direct access, as downstream code must not mutate this field.
key: KEY,
}
/// Never return a `Feed` from a query. Only queries that create a `DefId` are
/// allowed to feed queries for that `DefId`.
impl<KEY: Copy, CTX> !HashStable<CTX> for TyCtxtFeed<'_, KEY> {}
/// The same as `TyCtxtFeed`, but does not contain a `TyCtxt`.
/// Use this to pass around when you have a `TyCtxt` elsewhere.
/// Just an optimization to save space and not store hundreds of
/// `TyCtxtFeed` in the resolver.
#[derive(Copy, Clone)]
pub struct Feed<'tcx, KEY: Copy> {
_tcx: PhantomData<TyCtxt<'tcx>>,
// Do not allow direct access, as downstream code must not mutate this field.
key: KEY,
}
/// Never return a `Feed` from a query. Only queries that create a `DefId` are
/// allowed to feed queries for that `DefId`.
impl<KEY: Copy, CTX> !HashStable<CTX> for Feed<'_, KEY> {}
impl<T: fmt::Debug + Copy> fmt::Debug for Feed<'_, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.key.fmt(f)
}
}
/// Some workarounds to use cases that cannot use `create_def`.
/// Do not add new ways to create `TyCtxtFeed` without consulting
/// with T-compiler and making an analysis about why your addition
/// does not cause incremental compilation issues.
impl<'tcx> TyCtxt<'tcx> {
/// Can only be fed before queries are run, and is thus exempt from any
/// incremental issues. Do not use except for the initial query feeding.
pub fn feed_unit_query(self) -> TyCtxtFeed<'tcx, ()> {
self.dep_graph.assert_ignored();
TyCtxtFeed { tcx: self, key: () }
}
/// Only used in the resolver to register the `CRATE_DEF_ID` `DefId` and feed
/// some queries for it. It will panic if used twice.
pub fn create_local_crate_def_id(self, span: Span) -> TyCtxtFeed<'tcx, LocalDefId> {
let key = self.untracked().source_span.push(span);
assert_eq!(key, CRATE_DEF_ID);
TyCtxtFeed { tcx: self, key }
}
/// In order to break cycles involving `AnonConst`, we need to set the expected type by side
/// effect. However, we do not want this as a general capability, so this interface restricts
/// to the only allowed case.
pub fn feed_anon_const_type(self, key: LocalDefId, value: ty::EarlyBinder<Ty<'tcx>>) {
debug_assert_eq!(self.def_kind(key), DefKind::AnonConst);
TyCtxtFeed { tcx: self, key }.type_of(value)
}
}
impl<'tcx, KEY: Copy> TyCtxtFeed<'tcx, KEY> {
#[inline(always)]
pub fn key(&self) -> KEY {
self.key
}
#[inline(always)]
pub fn downgrade(self) -> Feed<'tcx, KEY> {
Feed { _tcx: PhantomData, key: self.key }
}
}
impl<'tcx, KEY: Copy> Feed<'tcx, KEY> {
#[inline(always)]
pub fn key(&self) -> KEY {
self.key
}
#[inline(always)]
pub fn upgrade(self, tcx: TyCtxt<'tcx>) -> TyCtxtFeed<'tcx, KEY> {
TyCtxtFeed { tcx, key: self.key }
}
}
impl<'tcx> TyCtxtFeed<'tcx, LocalDefId> {
#[inline(always)]
pub fn def_id(&self) -> LocalDefId {
self.key
}
// Caller must ensure that `self.key` ID is indeed an owner.
pub fn feed_owner_id(&self) -> TyCtxtFeed<'tcx, hir::OwnerId> {
TyCtxtFeed { tcx: self.tcx, key: hir::OwnerId { def_id: self.key } }
}
// Fills in all the important parts needed by HIR queries
pub fn feed_hir(&self) {
self.local_def_id_to_hir_id(HirId::make_owner(self.def_id()));
let node = hir::OwnerNode::Synthetic;
let bodies = Default::default();
let attrs = hir::AttributeMap::EMPTY;
let (opt_hash_including_bodies, _) = self.tcx.hash_owner_nodes(node, &bodies, &attrs.map);
let node = node.into();
self.opt_hir_owner_nodes(Some(self.tcx.arena.alloc(hir::OwnerNodes {
opt_hash_including_bodies,
nodes: IndexVec::from_elem_n(
hir::ParentedNode { parent: hir::ItemLocalId::INVALID, node },
1,
),
bodies,
})));
self.feed_owner_id().hir_attrs(attrs);
}
}
/// The central data structure of the compiler. It stores references
/// to the various **arenas** and also houses the results of the
/// various **compiler queries** that have been performed. See the
/// [rustc dev guide] for more details.
///
/// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/ty.html
///
/// An implementation detail: `TyCtxt` is a wrapper type for [GlobalCtxt],
/// which is the struct that actually holds all the data. `TyCtxt` derefs to
/// `GlobalCtxt`, and in practice `TyCtxt` is passed around everywhere, and all
/// operations are done via `TyCtxt`. A `TyCtxt` is obtained for a `GlobalCtxt`
/// by calling `enter` with a closure `f`. That function creates both the
/// `TyCtxt`, and an `ImplicitCtxt` around it that is put into TLS. Within `f`:
/// - The `ImplicitCtxt` is available implicitly via TLS.
/// - The `TyCtxt` is available explicitly via the `tcx` parameter, and also
/// implicitly within the `ImplicitCtxt`. Explicit access is preferred when
/// possible.
#[derive(Copy, Clone)]
#[rustc_diagnostic_item = "TyCtxt"]
#[rustc_pass_by_value]
pub struct TyCtxt<'tcx> {
gcx: &'tcx GlobalCtxt<'tcx>,
}
// Explicitly implement `DynSync` and `DynSend` for `TyCtxt` to short circuit trait resolution.
#[cfg(parallel_compiler)]
unsafe impl DynSend for TyCtxt<'_> {}
#[cfg(parallel_compiler)]
unsafe impl DynSync for TyCtxt<'_> {}
fn _assert_tcx_fields() {
sync::assert_dyn_sync::<&'_ GlobalCtxt<'_>>();
sync::assert_dyn_send::<&'_ GlobalCtxt<'_>>();
}
impl<'tcx> Deref for TyCtxt<'tcx> {
type Target = &'tcx GlobalCtxt<'tcx>;
#[inline(always)]
fn deref(&self) -> &Self::Target {
&self.gcx
}
}
/// See [TyCtxt] for details about this type.
pub struct GlobalCtxt<'tcx> {
pub arena: &'tcx WorkerLocal<Arena<'tcx>>,
pub hir_arena: &'tcx WorkerLocal<hir::Arena<'tcx>>,
interners: CtxtInterners<'tcx>,
pub sess: &'tcx Session,
crate_types: Vec<CrateType>,
/// The `stable_crate_id` is constructed out of the crate name and all the
/// `-C metadata` arguments passed to the compiler. Its value forms a unique
/// global identifier for the crate. It is used to allow multiple crates
/// with the same name to coexist. See the
/// `rustc_symbol_mangling` crate for more information.
stable_crate_id: StableCrateId,
pub dep_graph: DepGraph,
pub prof: SelfProfilerRef,
/// Common types, pre-interned for your convenience.
pub types: CommonTypes<'tcx>,
/// Common lifetimes, pre-interned for your convenience.
pub lifetimes: CommonLifetimes<'tcx>,
/// Common consts, pre-interned for your convenience.
pub consts: CommonConsts<'tcx>,
/// Hooks to be able to register functions in other crates that can then still
/// be called from rustc_middle.
pub(crate) hooks: crate::hooks::Providers,
untracked: Untracked,
pub query_system: QuerySystem<'tcx>,
pub(crate) query_kinds: &'tcx [DepKindStruct<'tcx>],
// Internal caches for metadata decoding. No need to track deps on this.
pub ty_rcache: Lock<FxHashMap<ty::CReaderCacheKey, Ty<'tcx>>>,
pub pred_rcache: Lock<FxHashMap<ty::CReaderCacheKey, Predicate<'tcx>>>,
/// Caches the results of trait selection. This cache is used
/// for things that do not have to do with the parameters in scope.
pub selection_cache: traits::SelectionCache<'tcx>,
/// Caches the results of trait evaluation. This cache is used
/// for things that do not have to do with the parameters in scope.
/// Merge this with `selection_cache`?
pub evaluation_cache: traits::EvaluationCache<'tcx>,
/// Caches the results of goal evaluation in the new solver.
pub new_solver_evaluation_cache: solve::EvaluationCache<'tcx>,
pub new_solver_coherence_evaluation_cache: solve::EvaluationCache<'tcx>,
pub canonical_param_env_cache: CanonicalParamEnvCache<'tcx>,
/// Data layout specification for the current target.
pub data_layout: TargetDataLayout,
/// Stores memory for globals (statics/consts).
pub(crate) alloc_map: Lock<interpret::AllocMap<'tcx>>,
current_gcx: CurrentGcx,
}
impl<'tcx> GlobalCtxt<'tcx> {
/// Installs `self` in a `TyCtxt` and `ImplicitCtxt` for the duration of
/// `f`.
pub fn enter<F, R>(&'tcx self, f: F) -> R
where
F: FnOnce(TyCtxt<'tcx>) -> R,
{
let icx = tls::ImplicitCtxt::new(self);
// Reset `current_gcx` to `None` when we exit.
let _on_drop = defer(move || {
*self.current_gcx.value.write() = None;
});
// Set this `GlobalCtxt` as the current one.
{
let mut guard = self.current_gcx.value.write();
assert!(guard.is_none(), "no `GlobalCtxt` is currently set");
*guard = Some(self as *const _ as *const ());
}
tls::enter_context(&icx, || f(icx.tcx))
}
pub fn finish(&self) -> FileEncodeResult {
self.dep_graph.finish_encoding()
}
}
/// This is used to get a reference to a `GlobalCtxt` if one is available.
///
/// This is needed to allow the deadlock handler access to `GlobalCtxt` to look for query cycles.
/// It cannot use the `TLV` global because that's only guaranteed to be defined on the thread
/// creating the `GlobalCtxt`. Other threads have access to the `TLV` only inside Rayon jobs, but
/// the deadlock handler is not called inside such a job.
#[derive(Clone)]
pub struct CurrentGcx {
/// This stores a pointer to a `GlobalCtxt`. This is set to `Some` inside `GlobalCtxt::enter`
/// and reset to `None` when that function returns or unwinds.
value: Lrc<RwLock<Option<*const ()>>>,
}
#[cfg(parallel_compiler)]
unsafe impl DynSend for CurrentGcx {}
#[cfg(parallel_compiler)]
unsafe impl DynSync for CurrentGcx {}
impl CurrentGcx {
pub fn new() -> Self {
Self { value: Lrc::new(RwLock::new(None)) }
}
pub fn access<R>(&self, f: impl for<'tcx> FnOnce(&'tcx GlobalCtxt<'tcx>) -> R) -> R {
let read_guard = self.value.read();
let gcx: *const GlobalCtxt<'_> = read_guard.unwrap() as *const _;
// SAFETY: We hold the read lock for the `GlobalCtxt` pointer. That prevents
// `GlobalCtxt::enter` from returning as it would first acquire the write lock.
// This ensures the `GlobalCtxt` is live during `f`.
f(unsafe { &*gcx })
}
}
impl<'tcx> TyCtxt<'tcx> {
pub fn has_typeck_results(self, def_id: LocalDefId) -> bool {
// Closures' typeck results come from their outermost function,
// as they are part of the same "inference environment".
let typeck_root_def_id = self.typeck_root_def_id(def_id.to_def_id());
if typeck_root_def_id != def_id.to_def_id() {
return self.has_typeck_results(typeck_root_def_id.expect_local());
}
self.hir_node_by_def_id(def_id).body_id().is_some()
}
/// Expects a body and returns its codegen attributes.
///
/// Unlike `codegen_fn_attrs`, this returns `CodegenFnAttrs::EMPTY` for
/// constants.
pub fn body_codegen_attrs(self, def_id: DefId) -> &'tcx CodegenFnAttrs {
let def_kind = self.def_kind(def_id);
if def_kind.has_codegen_attrs() {
self.codegen_fn_attrs(def_id)
} else if matches!(
def_kind,
DefKind::AnonConst | DefKind::AssocConst | DefKind::Const | DefKind::InlineConst
) {
CodegenFnAttrs::EMPTY
} else {
bug!(
"body_codegen_fn_attrs called on unexpected definition: {:?} {:?}",
def_id,
def_kind
)
}
}
pub fn alloc_steal_thir(self, thir: Thir<'tcx>) -> &'tcx Steal<Thir<'tcx>> {
self.arena.alloc(Steal::new(thir))
}
pub fn alloc_steal_mir(self, mir: Body<'tcx>) -> &'tcx Steal<Body<'tcx>> {
self.arena.alloc(Steal::new(mir))
}
pub fn alloc_steal_promoted(
self,
promoted: IndexVec<Promoted, Body<'tcx>>,
) -> &'tcx Steal<IndexVec<Promoted, Body<'tcx>>> {
self.arena.alloc(Steal::new(promoted))
}
pub fn mk_adt_def(
self,
did: DefId,
kind: AdtKind,
variants: IndexVec<VariantIdx, ty::VariantDef>,
repr: ReprOptions,
is_anonymous: bool,
) -> ty::AdtDef<'tcx> {
self.mk_adt_def_from_data(ty::AdtDefData::new(
self,
did,
kind,
variants,
repr,
is_anonymous,
))
}
/// Allocates a read-only byte or string literal for `mir::interpret`.
pub fn allocate_bytes(self, bytes: &[u8]) -> interpret::AllocId {
// Create an allocation that just contains these bytes.
let alloc = interpret::Allocation::from_bytes_byte_aligned_immutable(bytes);
let alloc = self.mk_const_alloc(alloc);
self.reserve_and_set_memory_alloc(alloc)
}
/// Returns a range of the start/end indices specified with the
/// `rustc_layout_scalar_valid_range` attribute.
// FIXME(eddyb) this is an awkward spot for this method, maybe move it?
pub fn layout_scalar_valid_range(self, def_id: DefId) -> (Bound<u128>, Bound<u128>) {
let get = |name| {
let Some(attr) = self.get_attr(def_id, name) else {
return Bound::Unbounded;
};
debug!("layout_scalar_valid_range: attr={:?}", attr);
if let Some(
&[