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context.rs
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//! Type context book-keeping.
#![allow(rustc::usage_of_ty_tykind)]
use crate::arena::Arena;
use crate::dep_graph::{DepGraph, DepKindStruct};
use crate::infer::canonical::{CanonicalVarInfo, CanonicalVarInfos};
use crate::lint::struct_lint_level;
use crate::middle::codegen_fn_attrs::CodegenFnAttrs;
use crate::middle::resolve_lifetime;
use crate::middle::stability;
use crate::mir::interpret::{self, Allocation, ConstAllocation};
use crate::mir::{
Body, BorrowCheckResult, Field, Local, Place, PlaceElem, ProjectionKind, Promoted,
};
use crate::thir::Thir;
use crate::traits;
use crate::ty::query::{self, TyCtxtAt};
use crate::ty::{
self, AdtDef, AdtDefData, AdtKind, Binder, Const, ConstData, DefIdTree, FloatTy, FloatVar,
FloatVid, GenericParamDefKind, ImplPolarity, InferTy, IntTy, IntVar, IntVid, List, ParamConst,
ParamTy, PolyExistentialPredicate, PolyFnSig, Predicate, PredicateKind, Region, RegionKind,
ReprOptions, TraitObjectVisitor, Ty, TyKind, TyVar, TyVid, TypeAndMut, TypeckResults, UintTy,
Visibility,
};
use crate::ty::{GenericArg, InternalSubsts, SubstsRef};
use rustc_ast as ast;
use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::intern::Interned;
use rustc_data_structures::memmap::Mmap;
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, Lock, Lrc, ReadGuard, WorkerLocal};
use rustc_errors::{
DecorateLint, DiagnosticBuilder, DiagnosticMessage, ErrorGuaranteed, 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::{
Constness, ExprKind, HirId, ImplItemKind, ItemKind, Node, TraitCandidate, TraitItemKind,
};
use rustc_index::vec::IndexVec;
use rustc_macros::HashStable;
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;
use rustc_session::Session;
use rustc_span::def_id::{DefPathHash, StableCrateId};
use rustc_span::source_map::SourceMap;
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{Span, DUMMY_SP};
use rustc_target::abi::{Layout, LayoutS, TargetDataLayout, VariantIdx};
use rustc_target::spec::abi;
use rustc_type_ir::sty::TyKind::*;
use rustc_type_ir::WithCachedTypeInfo;
use rustc_type_ir::{DynKind, InternAs, InternIteratorElement, Interner, TypeFlags};
use std::any::Any;
use std::borrow::Borrow;
use std::cmp::Ordering;
use std::fmt;
use std::hash::{Hash, Hasher};
use std::iter;
use std::mem;
use std::ops::{Bound, Deref};
pub trait OnDiskCache<'tcx>: rustc_data_structures::sync::Sync {
/// Creates a new `OnDiskCache` instance from the serialized data in `data`.
fn new(sess: &'tcx Session, data: Mmap, start_pos: usize) -> Self
where
Self: Sized;
fn new_empty(source_map: &'tcx SourceMap) -> Self
where
Self: Sized;
fn drop_serialized_data(&self, tcx: TyCtxt<'tcx>);
fn serialize(&self, tcx: TyCtxt<'tcx>, encoder: FileEncoder) -> FileEncodeResult;
}
#[allow(rustc::usage_of_ty_tykind)]
impl<'tcx> Interner for TyCtxt<'tcx> {
type AdtDef = ty::AdtDef<'tcx>;
type SubstsRef = ty::SubstsRef<'tcx>;
type DefId = DefId;
type Ty = Ty<'tcx>;
type Const = ty::Const<'tcx>;
type Region = Region<'tcx>;
type TypeAndMut = TypeAndMut<'tcx>;
type Mutability = hir::Mutability;
type Movability = hir::Movability;
type PolyFnSig = PolyFnSig<'tcx>;
type ListBinderExistentialPredicate = &'tcx List<PolyExistentialPredicate<'tcx>>;
type BinderListTy = Binder<'tcx, &'tcx List<Ty<'tcx>>>;
type ListTy = &'tcx List<Ty<'tcx>>;
type AliasTy = ty::AliasTy<'tcx>;
type ParamTy = ParamTy;
type BoundTy = ty::BoundTy;
type PlaceholderType = ty::PlaceholderType;
type InferTy = InferTy;
type ErrorGuaranteed = ErrorGuaranteed;
type PredicateKind = ty::PredicateKind<'tcx>;
type AllocId = crate::mir::interpret::AllocId;
type EarlyBoundRegion = ty::EarlyBoundRegion;
type BoundRegion = ty::BoundRegion;
type FreeRegion = ty::FreeRegion;
type RegionVid = ty::RegionVid;
type PlaceholderRegion = ty::PlaceholderRegion;
}
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>>>,
substs: InternedSet<'tcx, InternalSubsts<'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>>>>,
predicates: InternedSet<'tcx, List<Predicate<'tcx>>>,
projs: InternedSet<'tcx, List<ProjectionKind>>,
place_elems: InternedSet<'tcx, List<PlaceElem<'tcx>>>,
const_: InternedSet<'tcx, ConstData<'tcx>>,
const_allocation: InternedSet<'tcx, Allocation>,
bound_variable_kinds: InternedSet<'tcx, List<ty::BoundVariableKind>>,
layout: InternedSet<'tcx, LayoutS<VariantIdx>>,
adt_def: InternedSet<'tcx, AdtDefData>,
}
impl<'tcx> CtxtInterners<'tcx> {
fn new(arena: &'tcx WorkerLocal<Arena<'tcx>>) -> CtxtInterners<'tcx> {
CtxtInterners {
arena,
type_: Default::default(),
const_lists: Default::default(),
substs: Default::default(),
region: Default::default(),
poly_existential_predicates: Default::default(),
canonical_var_infos: Default::default(),
predicate: Default::default(),
predicates: Default::default(),
projs: Default::default(),
place_elems: Default::default(),
const_: Default::default(),
const_allocation: Default::default(),
bound_variable_kinds: Default::default(),
layout: Default::default(),
adt_def: Default::default(),
}
}
/// Interns a type.
#[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,
))
}
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::NEEDS_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()
}
}
#[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,
))
}
}
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 f32: Ty<'tcx>,
pub f64: 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.
pub trait_object_dummy_self: Ty<'tcx>,
}
pub struct CommonLifetimes<'tcx> {
/// `ReStatic`
pub re_static: Region<'tcx>,
/// Erased region, used outside of type inference.
pub re_erased: Region<'tcx>,
}
pub struct CommonConsts<'tcx> {
pub unit: 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);
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)),
f32: mk(Float(ty::FloatTy::F32)),
f64: mk(Float(ty::FloatTy::F64)),
str_: mk(Str),
self_param: mk(ty::Param(ty::ParamTy { index: 0, name: kw::SelfUpper })),
trait_object_dummy_self: mk(Infer(ty::FreshTy(0))),
}
}
}
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,
))
};
CommonLifetimes { re_static: mk(ty::ReStatic), re_erased: mk(ty::ReErased) }
}
}
impl<'tcx> CommonConsts<'tcx> {
fn new(interners: &CtxtInterners<'tcx>, types: &CommonTypes<'tcx>) -> CommonConsts<'tcx> {
let mk_const = |c| {
Const(Interned::new_unchecked(
interners.const_.intern(c, |c| InternedInSet(interners.arena.alloc(c))).0,
))
};
CommonConsts {
unit: mk_const(ty::ConstData {
kind: ty::ConstKind::Value(ty::ValTree::zst()),
ty: types.unit,
}),
}
}
}
/// This struct contains information regarding the `ReFree(FreeRegion)` corresponding to a lifetime
/// conflict.
#[derive(Debug)]
pub struct FreeRegionInfo {
/// `LocalDefId` corresponding to FreeRegion
pub def_id: LocalDefId,
/// the bound region corresponding to FreeRegion
pub boundregion: 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,
}
impl<'tcx> TyCtxt<'tcx> {
pub fn feed_unit_query(self) -> TyCtxtFeed<'tcx, ()> {
TyCtxtFeed { tcx: self, key: () }
}
pub fn feed_local_crate(self) -> TyCtxtFeed<'tcx, CrateNum> {
TyCtxtFeed { tcx: self, key: LOCAL_CRATE }
}
}
impl<'tcx, KEY: Copy> TyCtxtFeed<'tcx, KEY> {
#[inline(always)]
pub fn key(&self) -> KEY {
self.key
}
}
impl<'tcx> TyCtxtFeed<'tcx, LocalDefId> {
#[inline(always)]
pub fn def_id(&self) -> LocalDefId {
self.key
}
}
/// 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
#[derive(Copy, Clone)]
#[rustc_diagnostic_item = "TyCtxt"]
#[rustc_pass_by_value]
pub struct TyCtxt<'tcx> {
gcx: &'tcx GlobalCtxt<'tcx>,
}
impl<'tcx> Deref for TyCtxt<'tcx> {
type Target = &'tcx GlobalCtxt<'tcx>;
#[inline(always)]
fn deref(&self) -> &Self::Target {
&self.gcx
}
}
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,
/// This only ever stores a `LintStore` but we don't want a dependency on that type here.
///
/// FIXME(Centril): consider `dyn LintStoreMarker` once
/// we can upcast to `Any` for some additional type safety.
pub lint_store: Lrc<dyn Any + sync::Sync + sync::Send>,
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>,
untracked: Untracked,
/// This provides access to the incremental compilation on-disk cache for query results.
/// Do not access this directly. It is only meant to be used by
/// `DepGraph::try_mark_green()` and the query infrastructure.
/// This is `None` if we are not incremental compilation mode
pub on_disk_cache: Option<&'tcx dyn OnDiskCache<'tcx>>,
pub queries: &'tcx dyn query::QueryEngine<'tcx>,
pub query_caches: query::QueryCaches<'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>,
/// 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>>,
}
impl<'tcx> TyCtxt<'tcx> {
/// 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 typeck_opt_const_arg(
self,
def: ty::WithOptConstParam<LocalDefId>,
) -> &'tcx TypeckResults<'tcx> {
if let Some(param_did) = def.const_param_did {
self.typeck_const_arg((def.did, param_did))
} else {
self.typeck(def.did)
}
}
pub fn mir_borrowck_opt_const_arg(
self,
def: ty::WithOptConstParam<LocalDefId>,
) -> &'tcx BorrowCheckResult<'tcx> {
if let Some(param_did) = def.const_param_did {
self.mir_borrowck_const_arg((def.did, param_did))
} else {
self.mir_borrowck(def.did)
}
}
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 alloc_adt_def(
self,
did: DefId,
kind: AdtKind,
variants: IndexVec<VariantIdx, ty::VariantDef>,
repr: ReprOptions,
) -> ty::AdtDef<'tcx> {
self.intern_adt_def(ty::AdtDefData::new(self, did, kind, variants, repr))
}
/// 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.intern_const_alloc(alloc);
self.create_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(
&[
ast::NestedMetaItem::Lit(ast::MetaItemLit {
kind: ast::LitKind::Int(a, _),
..
}),
],
) = attr.meta_item_list().as_deref()
{
Bound::Included(a)
} else {
self.sess
.delay_span_bug(attr.span, "invalid rustc_layout_scalar_valid_range attribute");
Bound::Unbounded
}
};
(
get(sym::rustc_layout_scalar_valid_range_start),
get(sym::rustc_layout_scalar_valid_range_end),
)
}
pub fn lift<T: Lift<'tcx>>(self, value: T) -> Option<T::Lifted> {
value.lift_to_tcx(self)
}
/// Creates a type context and call the closure with a `TyCtxt` reference
/// to the context. The closure enforces that the type context and any interned
/// value (types, substs, etc.) can only be used while `ty::tls` has a valid
/// reference to the context, to allow formatting values that need it.
pub fn create_global_ctxt(
s: &'tcx Session,
lint_store: Lrc<dyn Any + sync::Send + sync::Sync>,
arena: &'tcx WorkerLocal<Arena<'tcx>>,
hir_arena: &'tcx WorkerLocal<hir::Arena<'tcx>>,
untracked: Untracked,
dep_graph: DepGraph,
on_disk_cache: Option<&'tcx dyn OnDiskCache<'tcx>>,
queries: &'tcx dyn query::QueryEngine<'tcx>,
query_kinds: &'tcx [DepKindStruct<'tcx>],
) -> GlobalCtxt<'tcx> {
let data_layout = s.target.parse_data_layout().unwrap_or_else(|err| {
s.emit_fatal(err);
});
let interners = CtxtInterners::new(arena);
let common_types = CommonTypes::new(&interners, s, &untracked);
let common_lifetimes = CommonLifetimes::new(&interners);
let common_consts = CommonConsts::new(&interners, &common_types);
GlobalCtxt {
sess: s,
lint_store,
arena,
hir_arena,
interners,
dep_graph,
prof: s.prof.clone(),
types: common_types,
lifetimes: common_lifetimes,
consts: common_consts,
untracked,
on_disk_cache,
queries,
query_caches: query::QueryCaches::default(),
query_kinds,
ty_rcache: Default::default(),
pred_rcache: Default::default(),
selection_cache: Default::default(),
evaluation_cache: Default::default(),
data_layout,
alloc_map: Lock::new(interpret::AllocMap::new()),
}
}
/// Constructs a `TyKind::Error` type with current `ErrorGuaranteed`
#[track_caller]
pub fn ty_error_with_guaranteed(self, reported: ErrorGuaranteed) -> Ty<'tcx> {
self.mk_ty(Error(reported))
}
/// Constructs a `TyKind::Error` type and registers a `delay_span_bug` to ensure it gets used.
#[track_caller]
pub fn ty_error(self) -> Ty<'tcx> {
self.ty_error_with_message(DUMMY_SP, "TyKind::Error constructed but no error reported")
}
/// Constructs a `TyKind::Error` type and registers a `delay_span_bug` with the given `msg` to
/// ensure it gets used.
#[track_caller]
pub fn ty_error_with_message<S: Into<MultiSpan>>(self, span: S, msg: &str) -> Ty<'tcx> {
let reported = self.sess.delay_span_bug(span, msg);
self.mk_ty(Error(reported))
}
/// Like [TyCtxt::ty_error] but for constants, with current `ErrorGuaranteed`
#[track_caller]
pub fn const_error_with_guaranteed(
self,
ty: Ty<'tcx>,
reported: ErrorGuaranteed,
) -> Const<'tcx> {
self.mk_const(ty::ConstKind::Error(reported), ty)
}
/// Like [TyCtxt::ty_error] but for constants.
#[track_caller]
pub fn const_error(self, ty: Ty<'tcx>) -> Const<'tcx> {
self.const_error_with_message(
ty,
DUMMY_SP,
"ty::ConstKind::Error constructed but no error reported",
)
}
/// Like [TyCtxt::ty_error_with_message] but for constants.
#[track_caller]
pub fn const_error_with_message<S: Into<MultiSpan>>(
self,
ty: Ty<'tcx>,
span: S,
msg: &str,
) -> Const<'tcx> {
let reported = self.sess.delay_span_bug(span, msg);
self.mk_const(ty::ConstKind::Error(reported), ty)
}
pub fn consider_optimizing<T: Fn() -> String>(self, msg: T) -> bool {
let cname = self.crate_name(LOCAL_CRATE);
self.sess.consider_optimizing(cname.as_str(), msg)
}
/// Obtain all lang items of this crate and all dependencies (recursively)
pub fn lang_items(self) -> &'tcx rustc_hir::lang_items::LanguageItems {
self.get_lang_items(())
}
/// Obtain the given diagnostic item's `DefId`. Use `is_diagnostic_item` if you just want to
/// compare against another `DefId`, since `is_diagnostic_item` is cheaper.
pub fn get_diagnostic_item(self, name: Symbol) -> Option<DefId> {
self.all_diagnostic_items(()).name_to_id.get(&name).copied()
}
/// Obtain the diagnostic item's name
pub fn get_diagnostic_name(self, id: DefId) -> Option<Symbol> {
self.diagnostic_items(id.krate).id_to_name.get(&id).copied()
}
/// Check whether the diagnostic item with the given `name` has the given `DefId`.
pub fn is_diagnostic_item(self, name: Symbol, did: DefId) -> bool {
self.diagnostic_items(did.krate).name_to_id.get(&name) == Some(&did)
}
/// Returns `true` if the node pointed to by `def_id` is a generator for an async construct.
pub fn generator_is_async(self, def_id: DefId) -> bool {
matches!(self.generator_kind(def_id), Some(hir::GeneratorKind::Async(_)))
}
pub fn stability(self) -> &'tcx stability::Index {
self.stability_index(())
}
pub fn features(self) -> &'tcx rustc_feature::Features {
self.features_query(())
}
pub fn def_key(self, id: DefId) -> rustc_hir::definitions::DefKey {
// Accessing the DefKey is ok, since it is part of DefPathHash.
if let Some(id) = id.as_local() {
self.definitions_untracked().def_key(id)
} else {
self.untracked.cstore.def_key(id)
}
}
/// Converts a `DefId` into its fully expanded `DefPath` (every
/// `DefId` is really just an interned `DefPath`).
///
/// Note that if `id` is not local to this crate, the result will
/// be a non-local `DefPath`.
pub fn def_path(self, id: DefId) -> rustc_hir::definitions::DefPath {
// Accessing the DefPath is ok, since it is part of DefPathHash.
if let Some(id) = id.as_local() {
self.definitions_untracked().def_path(id)
} else {
self.untracked.cstore.def_path(id)
}
}
#[inline]
pub fn def_path_hash(self, def_id: DefId) -> rustc_hir::definitions::DefPathHash {
// Accessing the DefPathHash is ok, it is incr. comp. stable.
if let Some(def_id) = def_id.as_local() {
self.definitions_untracked().def_path_hash(def_id)
} else {
self.untracked.cstore.def_path_hash(def_id)
}
}
#[inline]
pub fn stable_crate_id(self, crate_num: CrateNum) -> StableCrateId {
if crate_num == LOCAL_CRATE {
self.sess.local_stable_crate_id()
} else {
self.untracked.cstore.stable_crate_id(crate_num)
}
}
/// Maps a StableCrateId to the corresponding CrateNum. This method assumes
/// that the crate in question has already been loaded by the CrateStore.
#[inline]
pub fn stable_crate_id_to_crate_num(self, stable_crate_id: StableCrateId) -> CrateNum {
if stable_crate_id == self.sess.local_stable_crate_id() {
LOCAL_CRATE
} else {
self.untracked.cstore.stable_crate_id_to_crate_num(stable_crate_id)
}
}
/// Converts a `DefPathHash` to its corresponding `DefId` in the current compilation
/// session, if it still exists. This is used during incremental compilation to
/// turn a deserialized `DefPathHash` into its current `DefId`.
pub fn def_path_hash_to_def_id(self, hash: DefPathHash, err: &mut dyn FnMut() -> !) -> DefId {
debug!("def_path_hash_to_def_id({:?})", hash);
let stable_crate_id = hash.stable_crate_id();
// If this is a DefPathHash from the local crate, we can look up the
// DefId in the tcx's `Definitions`.
if stable_crate_id == self.sess.local_stable_crate_id() {
self.untracked.definitions.read().local_def_path_hash_to_def_id(hash, err).to_def_id()
} else {
// If this is a DefPathHash from an upstream crate, let the CrateStore map
// it to a DefId.
let cstore = &*self.untracked.cstore;
let cnum = cstore.stable_crate_id_to_crate_num(stable_crate_id);
cstore.def_path_hash_to_def_id(cnum, hash)
}
}
pub fn def_path_debug_str(self, def_id: DefId) -> String {
// We are explicitly not going through queries here in order to get
// crate name and stable crate id since this code is called from debug!()
// statements within the query system and we'd run into endless
// recursion otherwise.
let (crate_name, stable_crate_id) = if def_id.is_local() {
(self.crate_name(LOCAL_CRATE), self.sess.local_stable_crate_id())
} else {
let cstore = &*self.untracked.cstore;
(cstore.crate_name(def_id.krate), cstore.stable_crate_id(def_id.krate))
};
format!(
"{}[{:04x}]{}",
crate_name,
// Don't print the whole stable crate id. That's just
// annoying in debug output.
stable_crate_id.to_u64() >> 8 * 6,
self.def_path(def_id).to_string_no_crate_verbose()
)
}
}
impl<'tcx> TyCtxtAt<'tcx> {
/// Create a new definition within the incr. comp. engine.
pub fn create_def(
self,
parent: LocalDefId,
data: hir::definitions::DefPathData,
) -> TyCtxtFeed<'tcx, LocalDefId> {
// This function modifies `self.definitions` using a side-effect.
// We need to ensure that these side effects are re-run by the incr. comp. engine.
// Depending on the forever-red node will tell the graph that the calling query
// needs to be re-evaluated.
self.dep_graph.read_index(DepNodeIndex::FOREVER_RED_NODE);
// The following call has the side effect of modifying the tables inside `definitions`.
// These very tables are relied on by the incr. comp. engine to decode DepNodes and to
// decode the on-disk cache.
//
// Any LocalDefId which is used within queries, either as key or result, either:
// - has been created before the construction of the TyCtxt;
// - has been created by this call to `create_def`.
// As a consequence, this LocalDefId is always re-created before it is needed by the incr.
// comp. engine itself.
//
// This call also writes to the value of `source_span` and `expn_that_defined` queries.
// This is fine because:
// - those queries are `eval_always` so we won't miss their result changing;
// - this write will have happened before these queries are called.
let key = self.untracked.definitions.write().create_def(parent, data);
let feed = TyCtxtFeed { tcx: self.tcx, key };
feed.def_span(self.span);
feed
}
}
impl<'tcx> TyCtxt<'tcx> {
pub fn iter_local_def_id(self) -> impl Iterator<Item = LocalDefId> + 'tcx {
// Create a dependency to the red node to be sure we re-execute this when the amount of
// definitions change.
self.dep_graph.read_index(DepNodeIndex::FOREVER_RED_NODE);
let definitions = &self.untracked.definitions;
std::iter::from_generator(|| {
let mut i = 0;
// Recompute the number of definitions each time, because our caller may be creating
// new ones.
while i < { definitions.read().num_definitions() } {
let local_def_index = rustc_span::def_id::DefIndex::from_usize(i);
yield LocalDefId { local_def_index };
i += 1;
}
// Leak a read lock once we finish iterating on definitions, to prevent adding new ones.
definitions.leak();
})
}
pub fn def_path_table(self) -> &'tcx rustc_hir::definitions::DefPathTable {
// Create a dependency to the crate to be sure we re-execute this when the amount of
// definitions change.
self.dep_graph.read_index(DepNodeIndex::FOREVER_RED_NODE);
// Leak a read lock once we start iterating on definitions, to prevent adding new ones
// while iterating. If some query needs to add definitions, it should be `ensure`d above.
let definitions = self.untracked.definitions.leak();
definitions.def_path_table()
}
pub fn def_path_hash_to_def_index_map(
self,
) -> &'tcx rustc_hir::def_path_hash_map::DefPathHashMap {
// Create a dependency to the crate to be sure we re-execute this when the amount of
// definitions change.
self.ensure().hir_crate(());
// Leak a read lock once we start iterating on definitions, to prevent adding new ones
// while iterating. If some query needs to add definitions, it should be `ensure`d above.
let definitions = self.untracked.definitions.leak();
definitions.def_path_hash_to_def_index_map()
}
/// Note that this is *untracked* and should only be used within the query
/// system if the result is otherwise tracked through queries
pub fn cstore_untracked(self) -> &'tcx CrateStoreDyn {
&*self.untracked.cstore
}
/// Note that this is *untracked* and should only be used within the query
/// system if the result is otherwise tracked through queries
#[inline]
pub fn definitions_untracked(self) -> ReadGuard<'tcx, Definitions> {
self.untracked.definitions.read()
}
/// Note that this is *untracked* and should only be used within the query
/// system if the result is otherwise tracked through queries
#[inline]
pub fn source_span_untracked(self, def_id: LocalDefId) -> Span {
self.untracked.source_span.get(def_id).copied().unwrap_or(DUMMY_SP)
}
#[inline(always)]
pub fn with_stable_hashing_context<R>(
self,
f: impl FnOnce(StableHashingContext<'_>) -> R,
) -> R {
f(StableHashingContext::new(self.sess, &self.untracked))
}
pub fn serialize_query_result_cache(self, encoder: FileEncoder) -> FileEncodeResult {
self.on_disk_cache.as_ref().map_or(Ok(0), |c| c.serialize(self, encoder))
}
/// If `true`, we should use lazy normalization for constants, otherwise
/// we still evaluate them eagerly.
#[inline]
pub fn lazy_normalization(self) -> bool {
let features = self.features();
// Note: We only use lazy normalization for generic const expressions.
features.generic_const_exprs
}
#[inline]
pub fn local_crate_exports_generics(self) -> bool {
debug_assert!(self.sess.opts.share_generics());
self.sess.crate_types().iter().any(|crate_type| {
match crate_type {
CrateType::Executable
| CrateType::Staticlib
| CrateType::ProcMacro
| CrateType::Cdylib => false,
// FIXME rust-lang/rust#64319, rust-lang/rust#64872:
// We want to block export of generics from dylibs,
// but we must fix rust-lang/rust#65890 before we can
// do that robustly.
CrateType::Dylib => true,
CrateType::Rlib => true,
}
})
}
/// Returns the `DefId` and the `BoundRegionKind` corresponding to the given region.
pub fn is_suitable_region(self, region: Region<'tcx>) -> Option<FreeRegionInfo> {
let (suitable_region_binding_scope, bound_region) = match *region {
ty::ReFree(ref free_region) => {
(free_region.scope.expect_local(), free_region.bound_region)
}
ty::ReEarlyBound(ref ebr) => (
self.local_parent(ebr.def_id.expect_local()),
ty::BoundRegionKind::BrNamed(ebr.def_id, ebr.name),
),
_ => return None, // not a free region
};
let is_impl_item = match self.hir().find_by_def_id(suitable_region_binding_scope) {
Some(Node::Item(..) | Node::TraitItem(..)) => false,
Some(Node::ImplItem(..)) => {
self.is_bound_region_in_impl_item(suitable_region_binding_scope)
}
_ => return None,
};
Some(FreeRegionInfo {
def_id: suitable_region_binding_scope,
boundregion: bound_region,
is_impl_item,
})
}
/// Given a `DefId` for an `fn`, return all the `dyn` and `impl` traits in its return type.
pub fn return_type_impl_or_dyn_traits(
self,
scope_def_id: LocalDefId,
) -> Vec<&'tcx hir::Ty<'tcx>> {
let hir_id = self.hir().local_def_id_to_hir_id(scope_def_id);
let Some(hir::FnDecl { output: hir::FnRetTy::Return(hir_output), .. }) = self.hir().fn_decl_by_hir_id(hir_id) else {
return vec![];
};
let mut v = TraitObjectVisitor(vec![], self.hir());
v.visit_ty(hir_output);
v.0
}
/// Given a `DefId` for an `fn`, return all the `dyn` and `impl` traits in its return type and associated alias span when type alias is used