#![allow(rustc::usage_of_ty_tykind)]
use std::assert_matches::debug_assert_matches;
use std::borrow::Cow;
use std::iter;
use std::ops::{ControlFlow, Range};
use hir::def::{CtorKind, DefKind};
use rustc_abi::{ExternAbi, FIRST_VARIANT, FieldIdx, VariantIdx};
use rustc_data_structures::captures::Captures;
use rustc_errors::{ErrorGuaranteed, MultiSpan};
use rustc_hir as hir;
use rustc_hir::LangItem;
use rustc_hir::def_id::DefId;
use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, extension};
use rustc_span::symbol::{Symbol, sym};
use rustc_span::{DUMMY_SP, Span};
use rustc_type_ir::TyKind::*;
use rustc_type_ir::visit::TypeVisitableExt;
use rustc_type_ir::{self as ir, BoundVar, CollectAndApply, DynKind};
use tracing::instrument;
use ty::util::{AsyncDropGlueMorphology, IntTypeExt};
use super::GenericParamDefKind;
use crate::infer::canonical::Canonical;
use crate::ty::InferTy::*;
use crate::ty::{
self, AdtDef, BoundRegionKind, Discr, GenericArg, GenericArgs, GenericArgsRef, List, ParamEnv,
Region, Ty, TyCtxt, TypeFlags, TypeSuperVisitable, TypeVisitable, TypeVisitor,
};
#[rustc_diagnostic_item = "TyKind"]
pub type TyKind<'tcx> = ir::TyKind<TyCtxt<'tcx>>;
pub type TypeAndMut<'tcx> = ir::TypeAndMut<TyCtxt<'tcx>>;
pub type AliasTy<'tcx> = ir::AliasTy<TyCtxt<'tcx>>;
pub type FnSig<'tcx> = ir::FnSig<TyCtxt<'tcx>>;
pub type Binder<'tcx, T> = ir::Binder<TyCtxt<'tcx>, T>;
pub type EarlyBinder<'tcx, T> = ir::EarlyBinder<TyCtxt<'tcx>, T>;
pub type TypingMode<'tcx> = ir::TypingMode<TyCtxt<'tcx>>;
pub trait Article {
fn article(&self) -> &'static str;
}
impl<'tcx> Article for TyKind<'tcx> {
fn article(&self) -> &'static str {
match self {
Int(_) | Float(_) | Array(_, _) => "an",
Adt(def, _) if def.is_enum() => "an",
Error(_) => "a",
_ => "a",
}
}
}
#[extension(pub trait CoroutineArgsExt<'tcx>)]
impl<'tcx> ty::CoroutineArgs<TyCtxt<'tcx>> {
const UNRESUMED: usize = 0;
const RETURNED: usize = 1;
const POISONED: usize = 2;
const RESERVED_VARIANTS: usize = 3;
const UNRESUMED_NAME: &'static str = "Unresumed";
const RETURNED_NAME: &'static str = "Returned";
const POISONED_NAME: &'static str = "Panicked";
#[inline]
fn variant_range(&self, def_id: DefId, tcx: TyCtxt<'tcx>) -> Range<VariantIdx> {
FIRST_VARIANT
..tcx.coroutine_layout(def_id, tcx.types.unit).unwrap().variant_fields.next_index()
}
#[inline]
fn discriminant_for_variant(
&self,
def_id: DefId,
tcx: TyCtxt<'tcx>,
variant_index: VariantIdx,
) -> Discr<'tcx> {
assert!(self.variant_range(def_id, tcx).contains(&variant_index));
Discr { val: variant_index.as_usize() as u128, ty: self.discr_ty(tcx) }
}
#[inline]
fn discriminants(
self,
def_id: DefId,
tcx: TyCtxt<'tcx>,
) -> impl Iterator<Item = (VariantIdx, Discr<'tcx>)> + Captures<'tcx> {
self.variant_range(def_id, tcx).map(move |index| {
(index, Discr { val: index.as_usize() as u128, ty: self.discr_ty(tcx) })
})
}
fn variant_name(v: VariantIdx) -> Cow<'static, str> {
match v.as_usize() {
Self::UNRESUMED => Cow::from(Self::UNRESUMED_NAME),
Self::RETURNED => Cow::from(Self::RETURNED_NAME),
Self::POISONED => Cow::from(Self::POISONED_NAME),
_ => Cow::from(format!("Suspend{}", v.as_usize() - Self::RESERVED_VARIANTS)),
}
}
#[inline]
fn discr_ty(&self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
tcx.types.u32
}
#[inline]
fn state_tys(
self,
def_id: DefId,
tcx: TyCtxt<'tcx>,
) -> impl Iterator<Item: Iterator<Item = Ty<'tcx>> + Captures<'tcx>> {
let layout = tcx.coroutine_layout(def_id, self.kind_ty()).unwrap();
layout.variant_fields.iter().map(move |variant| {
variant.iter().map(move |field| {
ty::EarlyBinder::bind(layout.field_tys[*field].ty).instantiate(tcx, self.args)
})
})
}
#[inline]
fn prefix_tys(self) -> &'tcx List<Ty<'tcx>> {
self.upvar_tys()
}
}
#[derive(Debug, Copy, Clone, HashStable, TypeFoldable, TypeVisitable)]
pub enum UpvarArgs<'tcx> {
Closure(GenericArgsRef<'tcx>),
Coroutine(GenericArgsRef<'tcx>),
CoroutineClosure(GenericArgsRef<'tcx>),
}
impl<'tcx> UpvarArgs<'tcx> {
#[inline]
pub fn upvar_tys(self) -> &'tcx List<Ty<'tcx>> {
let tupled_tys = match self {
UpvarArgs::Closure(args) => args.as_closure().tupled_upvars_ty(),
UpvarArgs::Coroutine(args) => args.as_coroutine().tupled_upvars_ty(),
UpvarArgs::CoroutineClosure(args) => args.as_coroutine_closure().tupled_upvars_ty(),
};
match tupled_tys.kind() {
TyKind::Error(_) => ty::List::empty(),
TyKind::Tuple(..) => self.tupled_upvars_ty().tuple_fields(),
TyKind::Infer(_) => bug!("upvar_tys called before capture types are inferred"),
ty => bug!("Unexpected representation of upvar types tuple {:?}", ty),
}
}
#[inline]
pub fn tupled_upvars_ty(self) -> Ty<'tcx> {
match self {
UpvarArgs::Closure(args) => args.as_closure().tupled_upvars_ty(),
UpvarArgs::Coroutine(args) => args.as_coroutine().tupled_upvars_ty(),
UpvarArgs::CoroutineClosure(args) => args.as_coroutine_closure().tupled_upvars_ty(),
}
}
}
#[derive(Copy, Clone, Debug)]
pub struct InlineConstArgs<'tcx> {
pub args: GenericArgsRef<'tcx>,
}
pub struct InlineConstArgsParts<'tcx, T> {
pub parent_args: &'tcx [GenericArg<'tcx>],
pub ty: T,
}
impl<'tcx> InlineConstArgs<'tcx> {
pub fn new(
tcx: TyCtxt<'tcx>,
parts: InlineConstArgsParts<'tcx, Ty<'tcx>>,
) -> InlineConstArgs<'tcx> {
InlineConstArgs {
args: tcx.mk_args_from_iter(
parts.parent_args.iter().copied().chain(std::iter::once(parts.ty.into())),
),
}
}
fn split(self) -> InlineConstArgsParts<'tcx, GenericArg<'tcx>> {
match self.args[..] {
[ref parent_args @ .., ty] => InlineConstArgsParts { parent_args, ty },
_ => bug!("inline const args missing synthetics"),
}
}
pub fn parent_args(self) -> &'tcx [GenericArg<'tcx>] {
self.split().parent_args
}
pub fn ty(self) -> Ty<'tcx> {
self.split().ty.expect_ty()
}
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, TyEncodable, TyDecodable)]
#[derive(HashStable)]
pub enum BoundVariableKind {
Ty(BoundTyKind),
Region(BoundRegionKind),
Const,
}
impl BoundVariableKind {
pub fn expect_region(self) -> BoundRegionKind {
match self {
BoundVariableKind::Region(lt) => lt,
_ => bug!("expected a region, but found another kind"),
}
}
pub fn expect_ty(self) -> BoundTyKind {
match self {
BoundVariableKind::Ty(ty) => ty,
_ => bug!("expected a type, but found another kind"),
}
}
pub fn expect_const(self) {
match self {
BoundVariableKind::Const => (),
_ => bug!("expected a const, but found another kind"),
}
}
}
pub type PolyFnSig<'tcx> = Binder<'tcx, FnSig<'tcx>>;
pub type CanonicalPolyFnSig<'tcx> = Canonical<'tcx, Binder<'tcx, FnSig<'tcx>>>;
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, TyEncodable, TyDecodable)]
#[derive(HashStable)]
pub struct ParamTy {
pub index: u32,
pub name: Symbol,
}
impl rustc_type_ir::inherent::ParamLike for ParamTy {
fn index(self) -> u32 {
self.index
}
}
impl<'tcx> ParamTy {
pub fn new(index: u32, name: Symbol) -> ParamTy {
ParamTy { index, name }
}
pub fn for_def(def: &ty::GenericParamDef) -> ParamTy {
ParamTy::new(def.index, def.name)
}
#[inline]
pub fn to_ty(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
Ty::new_param(tcx, self.index, self.name)
}
pub fn span_from_generics(self, tcx: TyCtxt<'tcx>, item_with_generics: DefId) -> Span {
let generics = tcx.generics_of(item_with_generics);
let type_param = generics.type_param(self, tcx);
tcx.def_span(type_param.def_id)
}
}
#[derive(Copy, Clone, Hash, TyEncodable, TyDecodable, Eq, PartialEq, Ord, PartialOrd)]
#[derive(HashStable)]
pub struct ParamConst {
pub index: u32,
pub name: Symbol,
}
impl rustc_type_ir::inherent::ParamLike for ParamConst {
fn index(self) -> u32 {
self.index
}
}
impl ParamConst {
pub fn new(index: u32, name: Symbol) -> ParamConst {
ParamConst { index, name }
}
pub fn for_def(def: &ty::GenericParamDef) -> ParamConst {
ParamConst::new(def.index, def.name)
}
pub fn find_ty_from_env<'tcx>(self, env: ParamEnv<'tcx>) -> Ty<'tcx> {
let mut candidates = env.caller_bounds().iter().filter_map(|clause| {
match clause.kind().skip_binder() {
ty::ClauseKind::ConstArgHasType(param_ct, ty) => {
assert!(!(param_ct, ty).has_escaping_bound_vars());
match param_ct.kind() {
ty::ConstKind::Param(param_ct) if param_ct.index == self.index => Some(ty),
_ => None,
}
}
_ => None,
}
});
let ty = candidates.next().unwrap();
assert!(candidates.next().is_none());
ty
}
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
#[derive(HashStable)]
pub struct BoundTy {
pub var: BoundVar,
pub kind: BoundTyKind,
}
impl<'tcx> rustc_type_ir::inherent::BoundVarLike<TyCtxt<'tcx>> for BoundTy {
fn var(self) -> BoundVar {
self.var
}
fn assert_eq(self, var: ty::BoundVariableKind) {
assert_eq!(self.kind, var.expect_ty())
}
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, TyEncodable, TyDecodable)]
#[derive(HashStable)]
pub enum BoundTyKind {
Anon,
Param(DefId, Symbol),
}
impl From<BoundVar> for BoundTy {
fn from(var: BoundVar) -> Self {
BoundTy { var, kind: BoundTyKind::Anon }
}
}
impl<'tcx> Ty<'tcx> {
#[allow(rustc::usage_of_ty_tykind)]
#[inline]
pub fn new(tcx: TyCtxt<'tcx>, st: TyKind<'tcx>) -> Ty<'tcx> {
tcx.mk_ty_from_kind(st)
}
#[inline]
pub fn new_infer(tcx: TyCtxt<'tcx>, infer: ty::InferTy) -> Ty<'tcx> {
Ty::new(tcx, TyKind::Infer(infer))
}
#[inline]
pub fn new_var(tcx: TyCtxt<'tcx>, v: ty::TyVid) -> Ty<'tcx> {
tcx.types
.ty_vars
.get(v.as_usize())
.copied()
.unwrap_or_else(|| Ty::new(tcx, Infer(TyVar(v))))
}
#[inline]
pub fn new_int_var(tcx: TyCtxt<'tcx>, v: ty::IntVid) -> Ty<'tcx> {
Ty::new_infer(tcx, IntVar(v))
}
#[inline]
pub fn new_float_var(tcx: TyCtxt<'tcx>, v: ty::FloatVid) -> Ty<'tcx> {
Ty::new_infer(tcx, FloatVar(v))
}
#[inline]
pub fn new_fresh(tcx: TyCtxt<'tcx>, n: u32) -> Ty<'tcx> {
tcx.types
.fresh_tys
.get(n as usize)
.copied()
.unwrap_or_else(|| Ty::new_infer(tcx, ty::FreshTy(n)))
}
#[inline]
pub fn new_fresh_int(tcx: TyCtxt<'tcx>, n: u32) -> Ty<'tcx> {
tcx.types
.fresh_int_tys
.get(n as usize)
.copied()
.unwrap_or_else(|| Ty::new_infer(tcx, ty::FreshIntTy(n)))
}
#[inline]
pub fn new_fresh_float(tcx: TyCtxt<'tcx>, n: u32) -> Ty<'tcx> {
tcx.types
.fresh_float_tys
.get(n as usize)
.copied()
.unwrap_or_else(|| Ty::new_infer(tcx, ty::FreshFloatTy(n)))
}
#[inline]
pub fn new_param(tcx: TyCtxt<'tcx>, index: u32, name: Symbol) -> Ty<'tcx> {
tcx.mk_ty_from_kind(Param(ParamTy { index, name }))
}
#[inline]
pub fn new_bound(
tcx: TyCtxt<'tcx>,
index: ty::DebruijnIndex,
bound_ty: ty::BoundTy,
) -> Ty<'tcx> {
Ty::new(tcx, Bound(index, bound_ty))
}
#[inline]
pub fn new_placeholder(tcx: TyCtxt<'tcx>, placeholder: ty::PlaceholderType) -> Ty<'tcx> {
Ty::new(tcx, Placeholder(placeholder))
}
#[inline]
pub fn new_alias(
tcx: TyCtxt<'tcx>,
kind: ty::AliasTyKind,
alias_ty: ty::AliasTy<'tcx>,
) -> Ty<'tcx> {
debug_assert_matches!(
(kind, tcx.def_kind(alias_ty.def_id)),
(ty::Opaque, DefKind::OpaqueTy)
| (ty::Projection | ty::Inherent, DefKind::AssocTy)
| (ty::Weak, DefKind::TyAlias)
);
Ty::new(tcx, Alias(kind, alias_ty))
}
#[inline]
pub fn new_pat(tcx: TyCtxt<'tcx>, base: Ty<'tcx>, pat: ty::Pattern<'tcx>) -> Ty<'tcx> {
Ty::new(tcx, Pat(base, pat))
}
#[inline]
#[instrument(level = "debug", skip(tcx))]
pub fn new_opaque(tcx: TyCtxt<'tcx>, def_id: DefId, args: GenericArgsRef<'tcx>) -> Ty<'tcx> {
Ty::new_alias(tcx, ty::Opaque, AliasTy::new_from_args(tcx, def_id, args))
}
pub fn new_error(tcx: TyCtxt<'tcx>, guar: ErrorGuaranteed) -> Ty<'tcx> {
Ty::new(tcx, Error(guar))
}
#[track_caller]
pub fn new_misc_error(tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
Ty::new_error_with_message(tcx, DUMMY_SP, "TyKind::Error constructed but no error reported")
}
#[track_caller]
pub fn new_error_with_message<S: Into<MultiSpan>>(
tcx: TyCtxt<'tcx>,
span: S,
msg: impl Into<Cow<'static, str>>,
) -> Ty<'tcx> {
let reported = tcx.dcx().span_delayed_bug(span, msg);
Ty::new(tcx, Error(reported))
}
#[inline]
pub fn new_int(tcx: TyCtxt<'tcx>, i: ty::IntTy) -> Ty<'tcx> {
use ty::IntTy::*;
match i {
Isize => tcx.types.isize,
I8 => tcx.types.i8,
I16 => tcx.types.i16,
I32 => tcx.types.i32,
I64 => tcx.types.i64,
I128 => tcx.types.i128,
}
}
#[inline]
pub fn new_uint(tcx: TyCtxt<'tcx>, ui: ty::UintTy) -> Ty<'tcx> {
use ty::UintTy::*;
match ui {
Usize => tcx.types.usize,
U8 => tcx.types.u8,
U16 => tcx.types.u16,
U32 => tcx.types.u32,
U64 => tcx.types.u64,
U128 => tcx.types.u128,
}
}
#[inline]
pub fn new_float(tcx: TyCtxt<'tcx>, f: ty::FloatTy) -> Ty<'tcx> {
use ty::FloatTy::*;
match f {
F16 => tcx.types.f16,
F32 => tcx.types.f32,
F64 => tcx.types.f64,
F128 => tcx.types.f128,
}
}
#[inline]
pub fn new_ref(
tcx: TyCtxt<'tcx>,
r: Region<'tcx>,
ty: Ty<'tcx>,
mutbl: ty::Mutability,
) -> Ty<'tcx> {
Ty::new(tcx, Ref(r, ty, mutbl))
}
#[inline]
pub fn new_mut_ref(tcx: TyCtxt<'tcx>, r: Region<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
Ty::new_ref(tcx, r, ty, hir::Mutability::Mut)
}
#[inline]
pub fn new_imm_ref(tcx: TyCtxt<'tcx>, r: Region<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
Ty::new_ref(tcx, r, ty, hir::Mutability::Not)
}
pub fn new_pinned_ref(
tcx: TyCtxt<'tcx>,
r: Region<'tcx>,
ty: Ty<'tcx>,
mutbl: ty::Mutability,
) -> Ty<'tcx> {
let pin = tcx.adt_def(tcx.require_lang_item(LangItem::Pin, None));
Ty::new_adt(tcx, pin, tcx.mk_args(&[Ty::new_ref(tcx, r, ty, mutbl).into()]))
}
#[inline]
pub fn new_ptr(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, mutbl: ty::Mutability) -> Ty<'tcx> {
Ty::new(tcx, ty::RawPtr(ty, mutbl))
}
#[inline]
pub fn new_mut_ptr(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
Ty::new_ptr(tcx, ty, hir::Mutability::Mut)
}
#[inline]
pub fn new_imm_ptr(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
Ty::new_ptr(tcx, ty, hir::Mutability::Not)
}
#[inline]
pub fn new_adt(tcx: TyCtxt<'tcx>, def: AdtDef<'tcx>, args: GenericArgsRef<'tcx>) -> Ty<'tcx> {
tcx.debug_assert_args_compatible(def.did(), args);
Ty::new(tcx, Adt(def, args))
}
#[inline]
pub fn new_foreign(tcx: TyCtxt<'tcx>, def_id: DefId) -> Ty<'tcx> {
Ty::new(tcx, Foreign(def_id))
}
#[inline]
pub fn new_array(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, n: u64) -> Ty<'tcx> {
Ty::new(tcx, Array(ty, ty::Const::from_target_usize(tcx, n)))
}
#[inline]
pub fn new_array_with_const_len(
tcx: TyCtxt<'tcx>,
ty: Ty<'tcx>,
ct: ty::Const<'tcx>,
) -> Ty<'tcx> {
Ty::new(tcx, Array(ty, ct))
}
#[inline]
pub fn new_slice(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
Ty::new(tcx, Slice(ty))
}
#[inline]
pub fn new_tup(tcx: TyCtxt<'tcx>, ts: &[Ty<'tcx>]) -> Ty<'tcx> {
if ts.is_empty() { tcx.types.unit } else { Ty::new(tcx, Tuple(tcx.mk_type_list(ts))) }
}
pub fn new_tup_from_iter<I, T>(tcx: TyCtxt<'tcx>, iter: I) -> T::Output
where
I: Iterator<Item = T>,
T: CollectAndApply<Ty<'tcx>, Ty<'tcx>>,
{
T::collect_and_apply(iter, |ts| Ty::new_tup(tcx, ts))
}
#[inline]
pub fn new_fn_def(
tcx: TyCtxt<'tcx>,
def_id: DefId,
args: impl IntoIterator<Item: Into<GenericArg<'tcx>>>,
) -> Ty<'tcx> {
debug_assert_matches!(
tcx.def_kind(def_id),
DefKind::AssocFn | DefKind::Fn | DefKind::Ctor(_, CtorKind::Fn)
);
let args = tcx.check_and_mk_args(def_id, args);
Ty::new(tcx, FnDef(def_id, args))
}
#[inline]
pub fn new_fn_ptr(tcx: TyCtxt<'tcx>, fty: PolyFnSig<'tcx>) -> Ty<'tcx> {
let (sig_tys, hdr) = fty.split();
Ty::new(tcx, FnPtr(sig_tys, hdr))
}
#[inline]
pub fn new_dynamic(
tcx: TyCtxt<'tcx>,
obj: &'tcx List<ty::PolyExistentialPredicate<'tcx>>,
reg: ty::Region<'tcx>,
repr: DynKind,
) -> Ty<'tcx> {
Ty::new(tcx, Dynamic(obj, reg, repr))
}
#[inline]
pub fn new_projection_from_args(
tcx: TyCtxt<'tcx>,
item_def_id: DefId,
args: ty::GenericArgsRef<'tcx>,
) -> Ty<'tcx> {
Ty::new_alias(tcx, ty::Projection, AliasTy::new_from_args(tcx, item_def_id, args))
}
#[inline]
pub fn new_projection(
tcx: TyCtxt<'tcx>,
item_def_id: DefId,
args: impl IntoIterator<Item: Into<GenericArg<'tcx>>>,
) -> Ty<'tcx> {
Ty::new_alias(tcx, ty::Projection, AliasTy::new(tcx, item_def_id, args))
}
#[inline]
pub fn new_closure(
tcx: TyCtxt<'tcx>,
def_id: DefId,
closure_args: GenericArgsRef<'tcx>,
) -> Ty<'tcx> {
tcx.debug_assert_args_compatible(def_id, closure_args);
Ty::new(tcx, Closure(def_id, closure_args))
}
#[inline]
pub fn new_coroutine_closure(
tcx: TyCtxt<'tcx>,
def_id: DefId,
closure_args: GenericArgsRef<'tcx>,
) -> Ty<'tcx> {
tcx.debug_assert_args_compatible(def_id, closure_args);
Ty::new(tcx, CoroutineClosure(def_id, closure_args))
}
#[inline]
pub fn new_coroutine(
tcx: TyCtxt<'tcx>,
def_id: DefId,
coroutine_args: GenericArgsRef<'tcx>,
) -> Ty<'tcx> {
tcx.debug_assert_args_compatible(def_id, coroutine_args);
Ty::new(tcx, Coroutine(def_id, coroutine_args))
}
#[inline]
pub fn new_coroutine_witness(
tcx: TyCtxt<'tcx>,
id: DefId,
args: GenericArgsRef<'tcx>,
) -> Ty<'tcx> {
Ty::new(tcx, CoroutineWitness(id, args))
}
#[inline]
pub fn new_static_str(tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
Ty::new_imm_ref(tcx, tcx.lifetimes.re_static, tcx.types.str_)
}
#[inline]
pub fn new_diverging_default(tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
if tcx.features().never_type_fallback() { tcx.types.never } else { tcx.types.unit }
}
fn new_generic_adt(tcx: TyCtxt<'tcx>, wrapper_def_id: DefId, ty_param: Ty<'tcx>) -> Ty<'tcx> {
let adt_def = tcx.adt_def(wrapper_def_id);
let args = GenericArgs::for_item(tcx, wrapper_def_id, |param, args| match param.kind {
GenericParamDefKind::Lifetime | GenericParamDefKind::Const { .. } => bug!(),
GenericParamDefKind::Type { has_default, .. } => {
if param.index == 0 {
ty_param.into()
} else {
assert!(has_default);
tcx.type_of(param.def_id).instantiate(tcx, args).into()
}
}
});
Ty::new(tcx, Adt(adt_def, args))
}
#[inline]
pub fn new_lang_item(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, item: LangItem) -> Option<Ty<'tcx>> {
let def_id = tcx.lang_items().get(item)?;
Some(Ty::new_generic_adt(tcx, def_id, ty))
}
#[inline]
pub fn new_diagnostic_item(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, name: Symbol) -> Option<Ty<'tcx>> {
let def_id = tcx.get_diagnostic_item(name)?;
Some(Ty::new_generic_adt(tcx, def_id, ty))
}
#[inline]
pub fn new_box(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
let def_id = tcx.require_lang_item(LangItem::OwnedBox, None);
Ty::new_generic_adt(tcx, def_id, ty)
}
#[inline]
pub fn new_maybe_uninit(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
let def_id = tcx.require_lang_item(LangItem::MaybeUninit, None);
Ty::new_generic_adt(tcx, def_id, ty)
}
pub fn new_task_context(tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
let context_did = tcx.require_lang_item(LangItem::Context, None);
let context_adt_ref = tcx.adt_def(context_did);
let context_args = tcx.mk_args(&[tcx.lifetimes.re_erased.into()]);
let context_ty = Ty::new_adt(tcx, context_adt_ref, context_args);
Ty::new_mut_ref(tcx, tcx.lifetimes.re_erased, context_ty)
}
}
impl<'tcx> rustc_type_ir::inherent::Ty<TyCtxt<'tcx>> for Ty<'tcx> {
fn new_bool(tcx: TyCtxt<'tcx>) -> Self {
tcx.types.bool
}
fn new_u8(tcx: TyCtxt<'tcx>) -> Self {
tcx.types.u8
}
fn new_infer(tcx: TyCtxt<'tcx>, infer: ty::InferTy) -> Self {
Ty::new_infer(tcx, infer)
}
fn new_var(tcx: TyCtxt<'tcx>, vid: ty::TyVid) -> Self {
Ty::new_var(tcx, vid)
}
fn new_param(tcx: TyCtxt<'tcx>, param: ty::ParamTy) -> Self {
Ty::new_param(tcx, param.index, param.name)
}
fn new_placeholder(tcx: TyCtxt<'tcx>, placeholder: ty::PlaceholderType) -> Self {
Ty::new_placeholder(tcx, placeholder)
}
fn new_bound(interner: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundTy) -> Self {
Ty::new_bound(interner, debruijn, var)
}
fn new_anon_bound(tcx: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self {
Ty::new_bound(tcx, debruijn, ty::BoundTy { var, kind: ty::BoundTyKind::Anon })
}
fn new_alias(
interner: TyCtxt<'tcx>,
kind: ty::AliasTyKind,
alias_ty: ty::AliasTy<'tcx>,
) -> Self {
Ty::new_alias(interner, kind, alias_ty)
}
fn new_error(interner: TyCtxt<'tcx>, guar: ErrorGuaranteed) -> Self {
Ty::new_error(interner, guar)
}
fn new_adt(
interner: TyCtxt<'tcx>,
adt_def: ty::AdtDef<'tcx>,
args: ty::GenericArgsRef<'tcx>,
) -> Self {
Ty::new_adt(interner, adt_def, args)
}
fn new_foreign(interner: TyCtxt<'tcx>, def_id: DefId) -> Self {
Ty::new_foreign(interner, def_id)
}
fn new_dynamic(
interner: TyCtxt<'tcx>,
preds: &'tcx List<ty::PolyExistentialPredicate<'tcx>>,
region: ty::Region<'tcx>,
kind: ty::DynKind,
) -> Self {
Ty::new_dynamic(interner, preds, region, kind)
}
fn new_coroutine(
interner: TyCtxt<'tcx>,
def_id: DefId,
args: ty::GenericArgsRef<'tcx>,
) -> Self {
Ty::new_coroutine(interner, def_id, args)
}
fn new_coroutine_closure(
interner: TyCtxt<'tcx>,
def_id: DefId,
args: ty::GenericArgsRef<'tcx>,
) -> Self {
Ty::new_coroutine_closure(interner, def_id, args)
}
fn new_closure(interner: TyCtxt<'tcx>, def_id: DefId, args: ty::GenericArgsRef<'tcx>) -> Self {
Ty::new_closure(interner, def_id, args)
}
fn new_coroutine_witness(
interner: TyCtxt<'tcx>,
def_id: DefId,
args: ty::GenericArgsRef<'tcx>,
) -> Self {
Ty::new_coroutine_witness(interner, def_id, args)
}
fn new_ptr(interner: TyCtxt<'tcx>, ty: Self, mutbl: hir::Mutability) -> Self {
Ty::new_ptr(interner, ty, mutbl)
}
fn new_ref(
interner: TyCtxt<'tcx>,
region: ty::Region<'tcx>,
ty: Self,
mutbl: hir::Mutability,
) -> Self {
Ty::new_ref(interner, region, ty, mutbl)
}
fn new_array_with_const_len(interner: TyCtxt<'tcx>, ty: Self, len: ty::Const<'tcx>) -> Self {
Ty::new_array_with_const_len(interner, ty, len)
}
fn new_slice(interner: TyCtxt<'tcx>, ty: Self) -> Self {
Ty::new_slice(interner, ty)
}
fn new_tup(interner: TyCtxt<'tcx>, tys: &[Ty<'tcx>]) -> Self {
Ty::new_tup(interner, tys)
}
fn new_tup_from_iter<It, T>(interner: TyCtxt<'tcx>, iter: It) -> T::Output
where
It: Iterator<Item = T>,
T: CollectAndApply<Self, Self>,
{
Ty::new_tup_from_iter(interner, iter)
}
fn tuple_fields(self) -> &'tcx ty::List<Ty<'tcx>> {
self.tuple_fields()
}
fn to_opt_closure_kind(self) -> Option<ty::ClosureKind> {
self.to_opt_closure_kind()
}
fn from_closure_kind(interner: TyCtxt<'tcx>, kind: ty::ClosureKind) -> Self {
Ty::from_closure_kind(interner, kind)
}
fn from_coroutine_closure_kind(
interner: TyCtxt<'tcx>,
kind: rustc_type_ir::ClosureKind,
) -> Self {
Ty::from_coroutine_closure_kind(interner, kind)
}
fn new_fn_def(interner: TyCtxt<'tcx>, def_id: DefId, args: ty::GenericArgsRef<'tcx>) -> Self {
Ty::new_fn_def(interner, def_id, args)
}
fn new_fn_ptr(interner: TyCtxt<'tcx>, sig: ty::Binder<'tcx, ty::FnSig<'tcx>>) -> Self {
Ty::new_fn_ptr(interner, sig)
}
fn new_pat(interner: TyCtxt<'tcx>, ty: Self, pat: ty::Pattern<'tcx>) -> Self {
Ty::new_pat(interner, ty, pat)
}
fn new_unit(interner: TyCtxt<'tcx>) -> Self {
interner.types.unit
}
fn new_usize(interner: TyCtxt<'tcx>) -> Self {
interner.types.usize
}
fn discriminant_ty(self, interner: TyCtxt<'tcx>) -> Ty<'tcx> {
self.discriminant_ty(interner)
}
fn async_destructor_ty(self, interner: TyCtxt<'tcx>) -> Ty<'tcx> {
self.async_destructor_ty(interner)
}
fn has_unsafe_fields(self) -> bool {
Ty::has_unsafe_fields(self)
}
}
impl<'tcx> Ty<'tcx> {
#[inline(always)]
pub fn kind(self) -> &'tcx TyKind<'tcx> {
self.0.0
}
#[inline(always)]
pub fn flags(self) -> TypeFlags {
self.0.0.flags
}
#[inline]
pub fn is_unit(self) -> bool {
match self.kind() {
Tuple(tys) => tys.is_empty(),
_ => false,
}
}
#[inline]
pub fn is_never(self) -> bool {
matches!(self.kind(), Never)
}
#[inline]
pub fn is_primitive(self) -> bool {
matches!(self.kind(), Bool | Char | Int(_) | Uint(_) | Float(_))
}
#[inline]
pub fn is_adt(self) -> bool {
matches!(self.kind(), Adt(..))
}
#[inline]
pub fn is_ref(self) -> bool {
matches!(self.kind(), Ref(..))
}
#[inline]
pub fn is_ty_var(self) -> bool {
matches!(self.kind(), Infer(TyVar(_)))
}
#[inline]
pub fn ty_vid(self) -> Option<ty::TyVid> {
match self.kind() {
&Infer(TyVar(vid)) => Some(vid),
_ => None,
}
}
#[inline]
pub fn is_ty_or_numeric_infer(self) -> bool {
matches!(self.kind(), Infer(_))
}
#[inline]
pub fn is_phantom_data(self) -> bool {
if let Adt(def, _) = self.kind() { def.is_phantom_data() } else { false }
}
#[inline]
pub fn is_bool(self) -> bool {
*self.kind() == Bool
}
#[inline]
pub fn is_str(self) -> bool {
*self.kind() == Str
}
#[inline]
pub fn is_param(self, index: u32) -> bool {
match self.kind() {
ty::Param(ref data) => data.index == index,
_ => false,
}
}
#[inline]
pub fn is_slice(self) -> bool {
matches!(self.kind(), Slice(_))
}
#[inline]
pub fn is_array_slice(self) -> bool {
match self.kind() {
Slice(_) => true,
ty::RawPtr(ty, _) | Ref(_, ty, _) => matches!(ty.kind(), Slice(_)),
_ => false,
}
}
#[inline]
pub fn is_array(self) -> bool {
matches!(self.kind(), Array(..))
}
#[inline]
pub fn is_simd(self) -> bool {
match self.kind() {
Adt(def, _) => def.repr().simd(),
_ => false,
}
}
pub fn sequence_element_type(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
match self.kind() {
Array(ty, _) | Slice(ty) => *ty,
Str => tcx.types.u8,
_ => bug!("`sequence_element_type` called on non-sequence value: {}", self),
}
}
pub fn simd_size_and_type(self, tcx: TyCtxt<'tcx>) -> (u64, Ty<'tcx>) {
let Adt(def, args) = self.kind() else {
bug!("`simd_size_and_type` called on invalid type")
};
assert!(def.repr().simd(), "`simd_size_and_type` called on non-SIMD type");
let variant = def.non_enum_variant();
assert_eq!(variant.fields.len(), 1);
let field_ty = variant.fields[FieldIdx::ZERO].ty(tcx, args);
let Array(f0_elem_ty, f0_len) = field_ty.kind() else {
bug!("Simd type has non-array field type {field_ty:?}")
};
(
f0_len
.try_to_target_usize(tcx)
.expect("expected SIMD field to have definite array size"),
*f0_elem_ty,
)
}
#[inline]
pub fn is_mutable_ptr(self) -> bool {
matches!(self.kind(), RawPtr(_, hir::Mutability::Mut) | Ref(_, _, hir::Mutability::Mut))
}
#[inline]
pub fn ref_mutability(self) -> Option<hir::Mutability> {
match self.kind() {
Ref(_, _, mutability) => Some(*mutability),
_ => None,
}
}
#[inline]
pub fn is_unsafe_ptr(self) -> bool {
matches!(self.kind(), RawPtr(_, _))
}
#[inline]
pub fn is_any_ptr(self) -> bool {
self.is_ref() || self.is_unsafe_ptr() || self.is_fn_ptr()
}
#[inline]
pub fn is_box(self) -> bool {
match self.kind() {
Adt(def, _) => def.is_box(),
_ => false,
}
}
#[inline]
pub fn is_box_global(self, tcx: TyCtxt<'tcx>) -> bool {
match self.kind() {
Adt(def, args) if def.is_box() => {
let Some(alloc) = args.get(1) else {
return true;
};
alloc.expect_ty().ty_adt_def().is_some_and(|alloc_adt| {
let global_alloc = tcx.require_lang_item(LangItem::GlobalAlloc, None);
alloc_adt.did() == global_alloc
})
}
_ => false,
}
}
pub fn boxed_ty(self) -> Option<Ty<'tcx>> {
match self.kind() {
Adt(def, args) if def.is_box() => Some(args.type_at(0)),
_ => None,
}
}
pub fn expect_boxed_ty(self) -> Ty<'tcx> {
self.boxed_ty()
.unwrap_or_else(|| bug!("`expect_boxed_ty` is called on non-box type {:?}", self))
}
#[inline]
pub fn is_scalar(self) -> bool {
matches!(
self.kind(),
Bool | Char
| Int(_)
| Float(_)
| Uint(_)
| FnDef(..)
| FnPtr(..)
| RawPtr(_, _)
| Infer(IntVar(_) | FloatVar(_))
)
}
#[inline]
pub fn is_floating_point(self) -> bool {
matches!(self.kind(), Float(_) | Infer(FloatVar(_)))
}
#[inline]
pub fn is_trait(self) -> bool {
matches!(self.kind(), Dynamic(_, _, ty::Dyn))
}
#[inline]
pub fn is_dyn_star(self) -> bool {
matches!(self.kind(), Dynamic(_, _, ty::DynStar))
}
#[inline]
pub fn is_enum(self) -> bool {
matches!(self.kind(), Adt(adt_def, _) if adt_def.is_enum())
}
#[inline]
pub fn is_union(self) -> bool {
matches!(self.kind(), Adt(adt_def, _) if adt_def.is_union())
}
#[inline]
pub fn is_closure(self) -> bool {
matches!(self.kind(), Closure(..))
}
#[inline]
pub fn is_coroutine(self) -> bool {
matches!(self.kind(), Coroutine(..))
}
#[inline]
pub fn is_coroutine_closure(self) -> bool {
matches!(self.kind(), CoroutineClosure(..))
}
#[inline]
pub fn is_integral(self) -> bool {
matches!(self.kind(), Infer(IntVar(_)) | Int(_) | Uint(_))
}
#[inline]
pub fn is_fresh_ty(self) -> bool {
matches!(self.kind(), Infer(FreshTy(_)))
}
#[inline]
pub fn is_fresh(self) -> bool {
matches!(self.kind(), Infer(FreshTy(_) | FreshIntTy(_) | FreshFloatTy(_)))
}
#[inline]
pub fn is_char(self) -> bool {
matches!(self.kind(), Char)
}
#[inline]
pub fn is_numeric(self) -> bool {
self.is_integral() || self.is_floating_point()
}
#[inline]
pub fn is_signed(self) -> bool {
matches!(self.kind(), Int(_))
}
#[inline]
pub fn is_ptr_sized_integral(self) -> bool {
matches!(self.kind(), Int(ty::IntTy::Isize) | Uint(ty::UintTy::Usize))
}
#[inline]
pub fn has_concrete_skeleton(self) -> bool {
!matches!(self.kind(), Param(_) | Infer(_) | Error(_))
}
pub fn contains(self, other: Ty<'tcx>) -> bool {
struct ContainsTyVisitor<'tcx>(Ty<'tcx>);
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ContainsTyVisitor<'tcx> {
type Result = ControlFlow<()>;
fn visit_ty(&mut self, t: Ty<'tcx>) -> Self::Result {
if self.0 == t { ControlFlow::Break(()) } else { t.super_visit_with(self) }
}
}
let cf = self.visit_with(&mut ContainsTyVisitor(other));
cf.is_break()
}
pub fn contains_closure(self) -> bool {
struct ContainsClosureVisitor;
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ContainsClosureVisitor {
type Result = ControlFlow<()>;
fn visit_ty(&mut self, t: Ty<'tcx>) -> Self::Result {
if let ty::Closure(..) = t.kind() {
ControlFlow::Break(())
} else {
t.super_visit_with(self)
}
}
}
let cf = self.visit_with(&mut ContainsClosureVisitor);
cf.is_break()
}
pub fn builtin_deref(self, explicit: bool) -> Option<Ty<'tcx>> {
match *self.kind() {
_ if let Some(boxed) = self.boxed_ty() => Some(boxed),
Ref(_, ty, _) => Some(ty),
RawPtr(ty, _) if explicit => Some(ty),
_ => None,
}
}
pub fn builtin_index(self) -> Option<Ty<'tcx>> {
match self.kind() {
Array(ty, _) | Slice(ty) => Some(*ty),
_ => None,
}
}
#[tracing::instrument(level = "trace", skip(tcx))]
pub fn fn_sig(self, tcx: TyCtxt<'tcx>) -> PolyFnSig<'tcx> {
match self.kind() {
FnDef(def_id, args) => tcx.fn_sig(*def_id).instantiate(tcx, args),
FnPtr(sig_tys, hdr) => sig_tys.with(*hdr),
Error(_) => {
Binder::dummy(ty::FnSig {
inputs_and_output: ty::List::empty(),
c_variadic: false,
safety: hir::Safety::Safe,
abi: ExternAbi::Rust,
})
}
Closure(..) => bug!(
"to get the signature of a closure, use `args.as_closure().sig()` not `fn_sig()`",
),
_ => bug!("Ty::fn_sig() called on non-fn type: {:?}", self),
}
}
#[inline]
pub fn is_fn(self) -> bool {
matches!(self.kind(), FnDef(..) | FnPtr(..))
}
#[inline]
pub fn is_fn_ptr(self) -> bool {
matches!(self.kind(), FnPtr(..))
}
#[inline]
pub fn is_impl_trait(self) -> bool {
matches!(self.kind(), Alias(ty::Opaque, ..))
}
#[inline]
pub fn ty_adt_def(self) -> Option<AdtDef<'tcx>> {
match self.kind() {
Adt(adt, _) => Some(*adt),
_ => None,
}
}
#[inline]
pub fn tuple_fields(self) -> &'tcx List<Ty<'tcx>> {
match self.kind() {
Tuple(args) => args,
_ => bug!("tuple_fields called on non-tuple: {self:?}"),
}
}
#[inline]
pub fn variant_range(self, tcx: TyCtxt<'tcx>) -> Option<Range<VariantIdx>> {
match self.kind() {
TyKind::Adt(adt, _) => Some(adt.variant_range()),
TyKind::Coroutine(def_id, args) => {
Some(args.as_coroutine().variant_range(*def_id, tcx))
}
_ => None,
}
}
#[inline]
pub fn discriminant_for_variant(
self,
tcx: TyCtxt<'tcx>,
variant_index: VariantIdx,
) -> Option<Discr<'tcx>> {
match self.kind() {
TyKind::Adt(adt, _) if adt.is_enum() => {
Some(adt.discriminant_for_variant(tcx, variant_index))
}
TyKind::Coroutine(def_id, args) => {
Some(args.as_coroutine().discriminant_for_variant(*def_id, tcx, variant_index))
}
_ => None,
}
}
pub fn discriminant_ty(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
match self.kind() {
ty::Adt(adt, _) if adt.is_enum() => adt.repr().discr_type().to_ty(tcx),
ty::Coroutine(_, args) => args.as_coroutine().discr_ty(tcx),
ty::Param(_) | ty::Alias(..) | ty::Infer(ty::TyVar(_)) => {
let assoc_items = tcx.associated_item_def_ids(
tcx.require_lang_item(hir::LangItem::DiscriminantKind, None),
);
Ty::new_projection_from_args(tcx, assoc_items[0], tcx.mk_args(&[self.into()]))
}
ty::Pat(ty, _) => ty.discriminant_ty(tcx),
ty::Bool
| ty::Char
| ty::Int(_)
| ty::Uint(_)
| ty::Float(_)
| ty::Adt(..)
| ty::Foreign(_)
| ty::Str
| ty::Array(..)
| ty::Slice(_)
| ty::RawPtr(_, _)
| ty::Ref(..)
| ty::FnDef(..)
| ty::FnPtr(..)
| ty::Dynamic(..)
| ty::Closure(..)
| ty::CoroutineClosure(..)
| ty::CoroutineWitness(..)
| ty::Never
| ty::Tuple(_)
| ty::Error(_)
| ty::Infer(IntVar(_) | FloatVar(_)) => tcx.types.u8,
ty::Bound(..)
| ty::Placeholder(_)
| ty::Infer(FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
bug!("`discriminant_ty` applied to unexpected type: {:?}", self)
}
}
}
pub fn async_destructor_ty(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
match self.async_drop_glue_morphology(tcx) {
AsyncDropGlueMorphology::Noop => {
return Ty::async_destructor_combinator(tcx, LangItem::AsyncDropNoop)
.instantiate_identity();
}
AsyncDropGlueMorphology::DeferredDropInPlace => {
let drop_in_place =
Ty::async_destructor_combinator(tcx, LangItem::AsyncDropDeferredDropInPlace)
.instantiate(tcx, &[self.into()]);
return Ty::async_destructor_combinator(tcx, LangItem::AsyncDropFuse)
.instantiate(tcx, &[drop_in_place.into()]);
}
AsyncDropGlueMorphology::Custom => (),
}
match *self.kind() {
ty::Param(_) | ty::Alias(..) | ty::Infer(ty::TyVar(_)) => {
let assoc_items = tcx
.associated_item_def_ids(tcx.require_lang_item(LangItem::AsyncDestruct, None));
Ty::new_projection(tcx, assoc_items[0], [self])
}
ty::Array(elem_ty, _) | ty::Slice(elem_ty) => {
let dtor = Ty::async_destructor_combinator(tcx, LangItem::AsyncDropSlice)
.instantiate(tcx, &[elem_ty.into()]);
Ty::async_destructor_combinator(tcx, LangItem::AsyncDropFuse)
.instantiate(tcx, &[dtor.into()])
}
ty::Adt(adt_def, args) if adt_def.is_enum() || adt_def.is_struct() => self
.adt_async_destructor_ty(
tcx,
adt_def.variants().iter().map(|v| v.fields.iter().map(|f| f.ty(tcx, args))),
),
ty::Tuple(tys) => self.adt_async_destructor_ty(tcx, iter::once(tys)),
ty::Closure(_, args) => {
self.adt_async_destructor_ty(tcx, iter::once(args.as_closure().upvar_tys()))
}
ty::CoroutineClosure(_, args) => self
.adt_async_destructor_ty(tcx, iter::once(args.as_coroutine_closure().upvar_tys())),
ty::Adt(adt_def, _) => {
assert!(adt_def.is_union());
let surface_drop = self.surface_async_dropper_ty(tcx).unwrap();
Ty::async_destructor_combinator(tcx, LangItem::AsyncDropFuse)
.instantiate(tcx, &[surface_drop.into()])
}
ty::Bound(..)
| ty::Foreign(_)
| ty::Placeholder(_)
| ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
bug!("`async_destructor_ty` applied to unexpected type: {self:?}")
}
_ => bug!("`async_destructor_ty` is not yet implemented for type: {self:?}"),
}
}
fn adt_async_destructor_ty<I>(self, tcx: TyCtxt<'tcx>, variants: I) -> Ty<'tcx>
where
I: Iterator + ExactSizeIterator,
I::Item: IntoIterator<Item = Ty<'tcx>>,
{
debug_assert_eq!(self.async_drop_glue_morphology(tcx), AsyncDropGlueMorphology::Custom);
let defer = Ty::async_destructor_combinator(tcx, LangItem::AsyncDropDefer);
let chain = Ty::async_destructor_combinator(tcx, LangItem::AsyncDropChain);
let noop =
Ty::async_destructor_combinator(tcx, LangItem::AsyncDropNoop).instantiate_identity();
let either = Ty::async_destructor_combinator(tcx, LangItem::AsyncDropEither);
let variants_dtor = variants
.into_iter()
.map(|variant| {
variant
.into_iter()
.map(|ty| defer.instantiate(tcx, &[ty.into()]))
.reduce(|acc, next| chain.instantiate(tcx, &[acc.into(), next.into()]))
.unwrap_or(noop)
})
.reduce(|other, matched| {
either.instantiate(tcx, &[other.into(), matched.into(), self.into()])
})
.unwrap();
let dtor = if let Some(dropper_ty) = self.surface_async_dropper_ty(tcx) {
Ty::async_destructor_combinator(tcx, LangItem::AsyncDropChain)
.instantiate(tcx, &[dropper_ty.into(), variants_dtor.into()])
} else {
variants_dtor
};
Ty::async_destructor_combinator(tcx, LangItem::AsyncDropFuse)
.instantiate(tcx, &[dtor.into()])
}
fn surface_async_dropper_ty(self, tcx: TyCtxt<'tcx>) -> Option<Ty<'tcx>> {
let adt_def = self.ty_adt_def()?;
let dropper = adt_def
.async_destructor(tcx)
.map(|_| LangItem::SurfaceAsyncDropInPlace)
.or_else(|| adt_def.destructor(tcx).map(|_| LangItem::AsyncDropSurfaceDropInPlace))?;
Some(Ty::async_destructor_combinator(tcx, dropper).instantiate(tcx, &[self.into()]))
}
fn async_destructor_combinator(
tcx: TyCtxt<'tcx>,
lang_item: LangItem,
) -> ty::EarlyBinder<'tcx, Ty<'tcx>> {
tcx.fn_sig(tcx.require_lang_item(lang_item, None))
.map_bound(|fn_sig| fn_sig.output().no_bound_vars().unwrap())
}
pub fn ptr_metadata_ty_or_tail(
self,
tcx: TyCtxt<'tcx>,
normalize: impl FnMut(Ty<'tcx>) -> Ty<'tcx>,
) -> Result<Ty<'tcx>, Ty<'tcx>> {
let tail = tcx.struct_tail_raw(self, normalize, || {});
match tail.kind() {
ty::Infer(ty::IntVar(_) | ty::FloatVar(_))
| ty::Uint(_)
| ty::Int(_)
| ty::Bool
| ty::Float(_)
| ty::FnDef(..)
| ty::FnPtr(..)
| ty::RawPtr(..)
| ty::Char
| ty::Ref(..)
| ty::Coroutine(..)
| ty::CoroutineWitness(..)
| ty::Array(..)
| ty::Closure(..)
| ty::CoroutineClosure(..)
| ty::Never
| ty::Error(_)
| ty::Foreign(..)
| ty::Dynamic(_, _, ty::DynStar)
| ty::Adt(..)
| ty::Tuple(..) => Ok(tcx.types.unit),
ty::Str | ty::Slice(_) => Ok(tcx.types.usize),
ty::Dynamic(_, _, ty::Dyn) => {
let dyn_metadata = tcx.require_lang_item(LangItem::DynMetadata, None);
Ok(tcx.type_of(dyn_metadata).instantiate(tcx, &[tail.into()]))
}
ty::Param(_) | ty::Alias(..) => Err(tail),
ty::Infer(ty::TyVar(_))
| ty::Pat(..)
| ty::Bound(..)
| ty::Placeholder(..)
| ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => bug!(
"`ptr_metadata_ty_or_tail` applied to unexpected type: {self:?} (tail = {tail:?})"
),
}
}
pub fn ptr_metadata_ty(
self,
tcx: TyCtxt<'tcx>,
normalize: impl FnMut(Ty<'tcx>) -> Ty<'tcx>,
) -> Ty<'tcx> {
match self.ptr_metadata_ty_or_tail(tcx, normalize) {
Ok(metadata) => metadata,
Err(tail) => bug!(
"`ptr_metadata_ty` failed to get metadata for type: {self:?} (tail = {tail:?})"
),
}
}
#[track_caller]
pub fn pointee_metadata_ty_or_projection(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
let Some(pointee_ty) = self.builtin_deref(true) else {
bug!("Type {self:?} is not a pointer or reference type")
};
if pointee_ty.is_trivially_sized(tcx) {
tcx.types.unit
} else {
match pointee_ty.ptr_metadata_ty_or_tail(tcx, |x| x) {
Ok(metadata_ty) => metadata_ty,
Err(tail_ty) => {
let Some(metadata_def_id) = tcx.lang_items().metadata_type() else {
bug!("No metadata_type lang item while looking at {self:?}")
};
Ty::new_projection(tcx, metadata_def_id, [tail_ty])
}
}
}
}
pub fn to_opt_closure_kind(self) -> Option<ty::ClosureKind> {
match self.kind() {
Int(int_ty) => match int_ty {
ty::IntTy::I8 => Some(ty::ClosureKind::Fn),
ty::IntTy::I16 => Some(ty::ClosureKind::FnMut),
ty::IntTy::I32 => Some(ty::ClosureKind::FnOnce),
_ => bug!("cannot convert type `{:?}` to a closure kind", self),
},
Bound(..) | Placeholder(_) | Param(_) | Infer(_) => None,
Error(_) => Some(ty::ClosureKind::Fn),
_ => bug!("cannot convert type `{:?}` to a closure kind", self),
}
}
pub fn from_closure_kind(tcx: TyCtxt<'tcx>, kind: ty::ClosureKind) -> Ty<'tcx> {
match kind {
ty::ClosureKind::Fn => tcx.types.i8,
ty::ClosureKind::FnMut => tcx.types.i16,
ty::ClosureKind::FnOnce => tcx.types.i32,
}
}
pub fn from_coroutine_closure_kind(tcx: TyCtxt<'tcx>, kind: ty::ClosureKind) -> Ty<'tcx> {
match kind {
ty::ClosureKind::Fn | ty::ClosureKind::FnMut => tcx.types.i16,
ty::ClosureKind::FnOnce => tcx.types.i32,
}
}
pub fn is_trivially_sized(self, tcx: TyCtxt<'tcx>) -> bool {
match self.kind() {
ty::Infer(ty::IntVar(_) | ty::FloatVar(_))
| ty::Uint(_)
| ty::Int(_)
| ty::Bool
| ty::Float(_)
| ty::FnDef(..)
| ty::FnPtr(..)
| ty::RawPtr(..)
| ty::Char
| ty::Ref(..)
| ty::Coroutine(..)
| ty::CoroutineWitness(..)
| ty::Array(..)
| ty::Pat(..)
| ty::Closure(..)
| ty::CoroutineClosure(..)
| ty::Never
| ty::Error(_)
| ty::Dynamic(_, _, ty::DynStar) => true,
ty::Str | ty::Slice(_) | ty::Dynamic(_, _, ty::Dyn) | ty::Foreign(..) => false,
ty::Tuple(tys) => tys.last().map_or(true, |ty| ty.is_trivially_sized(tcx)),
ty::Adt(def, args) => def
.sized_constraint(tcx)
.map_or(true, |ty| ty.instantiate(tcx, args).is_trivially_sized(tcx)),
ty::Alias(..) | ty::Param(_) | ty::Placeholder(..) | ty::Bound(..) => false,
ty::Infer(ty::TyVar(_)) => false,
ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
bug!("`is_trivially_sized` applied to unexpected type: {:?}", self)
}
}
}
pub fn is_trivially_pure_clone_copy(self) -> bool {
match self.kind() {
ty::Bool | ty::Char | ty::Never => true,
ty::Str | ty::Slice(..) | ty::Foreign(..) | ty::Dynamic(..) => false,
ty::Infer(ty::InferTy::FloatVar(_) | ty::InferTy::IntVar(_))
| ty::Int(..)
| ty::Uint(..)
| ty::Float(..) => true,
ty::FnDef(..) => true,
ty::Array(element_ty, _len) => element_ty.is_trivially_pure_clone_copy(),
ty::Tuple(field_tys) => {
field_tys.len() <= 3 && field_tys.iter().all(Self::is_trivially_pure_clone_copy)
}
ty::Pat(ty, _) => ty.is_trivially_pure_clone_copy(),
ty::FnPtr(..) => false,
ty::Ref(_, _, hir::Mutability::Mut) => false,
ty::Ref(_, _, hir::Mutability::Not) | ty::RawPtr(..) => true,
ty::Coroutine(..) | ty::CoroutineWitness(..) => false,
ty::Adt(..) | ty::Closure(..) | ty::CoroutineClosure(..) => false,
ty::Alias(..) => false,
ty::Param(..) | ty::Infer(..) | ty::Error(..) => false,
ty::Bound(..) | ty::Placeholder(..) => {
bug!("`is_trivially_pure_clone_copy` applied to unexpected type: {:?}", self);
}
}
}
pub fn primitive_symbol(self) -> Option<Symbol> {
match self.kind() {
ty::Bool => Some(sym::bool),
ty::Char => Some(sym::char),
ty::Float(f) => match f {
ty::FloatTy::F16 => Some(sym::f16),
ty::FloatTy::F32 => Some(sym::f32),
ty::FloatTy::F64 => Some(sym::f64),
ty::FloatTy::F128 => Some(sym::f128),
},
ty::Int(f) => match f {
ty::IntTy::Isize => Some(sym::isize),
ty::IntTy::I8 => Some(sym::i8),
ty::IntTy::I16 => Some(sym::i16),
ty::IntTy::I32 => Some(sym::i32),
ty::IntTy::I64 => Some(sym::i64),
ty::IntTy::I128 => Some(sym::i128),
},
ty::Uint(f) => match f {
ty::UintTy::Usize => Some(sym::usize),
ty::UintTy::U8 => Some(sym::u8),
ty::UintTy::U16 => Some(sym::u16),
ty::UintTy::U32 => Some(sym::u32),
ty::UintTy::U64 => Some(sym::u64),
ty::UintTy::U128 => Some(sym::u128),
},
ty::Str => Some(sym::str),
_ => None,
}
}
pub fn is_c_void(self, tcx: TyCtxt<'_>) -> bool {
match self.kind() {
ty::Adt(adt, _) => tcx.is_lang_item(adt.did(), LangItem::CVoid),
_ => false,
}
}
pub fn is_known_rigid(self) -> bool {
match self.kind() {
Bool
| Char
| Int(_)
| Uint(_)
| Float(_)
| Adt(_, _)
| Foreign(_)
| Str
| Array(_, _)
| Pat(_, _)
| Slice(_)
| RawPtr(_, _)
| Ref(_, _, _)
| FnDef(_, _)
| FnPtr(..)
| Dynamic(_, _, _)
| Closure(_, _)
| CoroutineClosure(_, _)
| Coroutine(_, _)
| CoroutineWitness(..)
| Never
| Tuple(_) => true,
Error(_) | Infer(_) | Alias(_, _) | Param(_) | Bound(_, _) | Placeholder(_) => false,
}
}
}
impl<'tcx> rustc_type_ir::inherent::Tys<TyCtxt<'tcx>> for &'tcx ty::List<Ty<'tcx>> {
fn inputs(self) -> &'tcx [Ty<'tcx>] {
self.split_last().unwrap().1
}
fn output(self) -> Ty<'tcx> {
*self.split_last().unwrap().0
}
}
#[cfg(target_pointer_width = "64")]
mod size_asserts {
use rustc_data_structures::static_assert_size;
use super::*;
static_assert_size!(ty::RegionKind<'_>, 24);
static_assert_size!(ty::TyKind<'_>, 24);
}