use core::intrinsics;
use std::marker::PhantomData;
use std::mem;
use std::num::NonZero;
use std::ptr::NonNull;
use rustc_ast_ir::visit::VisitorResult;
use rustc_ast_ir::walk_visitable_list;
use rustc_data_structures::intern::Interned;
use rustc_errors::{DiagArgValue, IntoDiagArg};
use rustc_hir::def_id::DefId;
use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable, extension};
use rustc_serialize::{Decodable, Encodable};
use rustc_type_ir::WithCachedTypeInfo;
use smallvec::SmallVec;
use crate::ty::codec::{TyDecoder, TyEncoder};
use crate::ty::fold::{FallibleTypeFolder, TypeFoldable};
use crate::ty::visit::{TypeVisitable, TypeVisitor};
use crate::ty::{
self, ClosureArgs, CoroutineArgs, CoroutineClosureArgs, InlineConstArgs, Lift, List, Ty, TyCtxt,
};
pub type GenericArgKind<'tcx> = rustc_type_ir::GenericArgKind<TyCtxt<'tcx>>;
pub type TermKind<'tcx> = rustc_type_ir::TermKind<TyCtxt<'tcx>>;
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub struct GenericArg<'tcx> {
ptr: NonNull<()>,
marker: PhantomData<(Ty<'tcx>, ty::Region<'tcx>, ty::Const<'tcx>)>,
}
impl<'tcx> rustc_type_ir::inherent::GenericArg<TyCtxt<'tcx>> for GenericArg<'tcx> {}
impl<'tcx> rustc_type_ir::inherent::GenericArgs<TyCtxt<'tcx>> for ty::GenericArgsRef<'tcx> {
fn rebase_onto(
self,
tcx: TyCtxt<'tcx>,
source_ancestor: DefId,
target_args: GenericArgsRef<'tcx>,
) -> GenericArgsRef<'tcx> {
self.rebase_onto(tcx, source_ancestor, target_args)
}
fn type_at(self, i: usize) -> Ty<'tcx> {
self.type_at(i)
}
fn region_at(self, i: usize) -> ty::Region<'tcx> {
self.region_at(i)
}
fn const_at(self, i: usize) -> ty::Const<'tcx> {
self.const_at(i)
}
fn identity_for_item(tcx: TyCtxt<'tcx>, def_id: DefId) -> ty::GenericArgsRef<'tcx> {
GenericArgs::identity_for_item(tcx, def_id)
}
fn extend_with_error(
tcx: TyCtxt<'tcx>,
def_id: DefId,
original_args: &[ty::GenericArg<'tcx>],
) -> ty::GenericArgsRef<'tcx> {
ty::GenericArgs::extend_with_error(tcx, def_id, original_args)
}
fn split_closure_args(self) -> ty::ClosureArgsParts<TyCtxt<'tcx>> {
match self[..] {
[ref parent_args @ .., closure_kind_ty, closure_sig_as_fn_ptr_ty, tupled_upvars_ty] => {
ty::ClosureArgsParts {
parent_args,
closure_kind_ty: closure_kind_ty.expect_ty(),
closure_sig_as_fn_ptr_ty: closure_sig_as_fn_ptr_ty.expect_ty(),
tupled_upvars_ty: tupled_upvars_ty.expect_ty(),
}
}
_ => bug!("closure args missing synthetics"),
}
}
fn split_coroutine_closure_args(self) -> ty::CoroutineClosureArgsParts<TyCtxt<'tcx>> {
match self[..] {
[
ref parent_args @ ..,
closure_kind_ty,
signature_parts_ty,
tupled_upvars_ty,
coroutine_captures_by_ref_ty,
coroutine_witness_ty,
] => ty::CoroutineClosureArgsParts {
parent_args,
closure_kind_ty: closure_kind_ty.expect_ty(),
signature_parts_ty: signature_parts_ty.expect_ty(),
tupled_upvars_ty: tupled_upvars_ty.expect_ty(),
coroutine_captures_by_ref_ty: coroutine_captures_by_ref_ty.expect_ty(),
coroutine_witness_ty: coroutine_witness_ty.expect_ty(),
},
_ => bug!("closure args missing synthetics"),
}
}
fn split_coroutine_args(self) -> ty::CoroutineArgsParts<TyCtxt<'tcx>> {
match self[..] {
[
ref parent_args @ ..,
kind_ty,
resume_ty,
yield_ty,
return_ty,
witness,
tupled_upvars_ty,
] => ty::CoroutineArgsParts {
parent_args,
kind_ty: kind_ty.expect_ty(),
resume_ty: resume_ty.expect_ty(),
yield_ty: yield_ty.expect_ty(),
return_ty: return_ty.expect_ty(),
witness: witness.expect_ty(),
tupled_upvars_ty: tupled_upvars_ty.expect_ty(),
},
_ => bug!("coroutine args missing synthetics"),
}
}
}
impl<'tcx> rustc_type_ir::inherent::IntoKind for GenericArg<'tcx> {
type Kind = GenericArgKind<'tcx>;
fn kind(self) -> Self::Kind {
self.unpack()
}
}
#[cfg(parallel_compiler)]
unsafe impl<'tcx> rustc_data_structures::sync::DynSend for GenericArg<'tcx> where
&'tcx (Ty<'tcx>, ty::Region<'tcx>, ty::Const<'tcx>): rustc_data_structures::sync::DynSend
{
}
#[cfg(parallel_compiler)]
unsafe impl<'tcx> rustc_data_structures::sync::DynSync for GenericArg<'tcx> where
&'tcx (Ty<'tcx>, ty::Region<'tcx>, ty::Const<'tcx>): rustc_data_structures::sync::DynSync
{
}
unsafe impl<'tcx> Send for GenericArg<'tcx> where
&'tcx (Ty<'tcx>, ty::Region<'tcx>, ty::Const<'tcx>): Send
{
}
unsafe impl<'tcx> Sync for GenericArg<'tcx> where
&'tcx (Ty<'tcx>, ty::Region<'tcx>, ty::Const<'tcx>): Sync
{
}
impl<'tcx> IntoDiagArg for GenericArg<'tcx> {
fn into_diag_arg(self) -> DiagArgValue {
self.to_string().into_diag_arg()
}
}
const TAG_MASK: usize = 0b11;
const TYPE_TAG: usize = 0b00;
const REGION_TAG: usize = 0b01;
const CONST_TAG: usize = 0b10;
#[extension(trait GenericArgPackExt<'tcx>)]
impl<'tcx> GenericArgKind<'tcx> {
#[inline]
fn pack(self) -> GenericArg<'tcx> {
let (tag, ptr) = match self {
GenericArgKind::Lifetime(lt) => {
assert_eq!(mem::align_of_val(&*lt.0.0) & TAG_MASK, 0);
(REGION_TAG, NonNull::from(lt.0.0).cast())
}
GenericArgKind::Type(ty) => {
assert_eq!(mem::align_of_val(&*ty.0.0) & TAG_MASK, 0);
(TYPE_TAG, NonNull::from(ty.0.0).cast())
}
GenericArgKind::Const(ct) => {
assert_eq!(mem::align_of_val(&*ct.0.0) & TAG_MASK, 0);
(CONST_TAG, NonNull::from(ct.0.0).cast())
}
};
GenericArg { ptr: ptr.map_addr(|addr| addr | tag), marker: PhantomData }
}
}
impl<'tcx> From<ty::Region<'tcx>> for GenericArg<'tcx> {
#[inline]
fn from(r: ty::Region<'tcx>) -> GenericArg<'tcx> {
GenericArgKind::Lifetime(r).pack()
}
}
impl<'tcx> From<Ty<'tcx>> for GenericArg<'tcx> {
#[inline]
fn from(ty: Ty<'tcx>) -> GenericArg<'tcx> {
GenericArgKind::Type(ty).pack()
}
}
impl<'tcx> From<ty::Const<'tcx>> for GenericArg<'tcx> {
#[inline]
fn from(c: ty::Const<'tcx>) -> GenericArg<'tcx> {
GenericArgKind::Const(c).pack()
}
}
impl<'tcx> From<ty::Term<'tcx>> for GenericArg<'tcx> {
fn from(value: ty::Term<'tcx>) -> Self {
match value.unpack() {
ty::TermKind::Ty(t) => t.into(),
ty::TermKind::Const(c) => c.into(),
}
}
}
impl<'tcx> GenericArg<'tcx> {
#[inline]
pub fn unpack(self) -> GenericArgKind<'tcx> {
let ptr =
unsafe { self.ptr.map_addr(|addr| NonZero::new_unchecked(addr.get() & !TAG_MASK)) };
unsafe {
match self.ptr.addr().get() & TAG_MASK {
REGION_TAG => GenericArgKind::Lifetime(ty::Region(Interned::new_unchecked(
ptr.cast::<ty::RegionKind<'tcx>>().as_ref(),
))),
TYPE_TAG => GenericArgKind::Type(Ty(Interned::new_unchecked(
ptr.cast::<WithCachedTypeInfo<ty::TyKind<'tcx>>>().as_ref(),
))),
CONST_TAG => GenericArgKind::Const(ty::Const(Interned::new_unchecked(
ptr.cast::<WithCachedTypeInfo<ty::ConstKind<'tcx>>>().as_ref(),
))),
_ => intrinsics::unreachable(),
}
}
}
#[inline]
pub fn as_type(self) -> Option<Ty<'tcx>> {
match self.unpack() {
GenericArgKind::Type(ty) => Some(ty),
_ => None,
}
}
#[inline]
pub fn as_region(self) -> Option<ty::Region<'tcx>> {
match self.unpack() {
GenericArgKind::Lifetime(re) => Some(re),
_ => None,
}
}
#[inline]
pub fn as_const(self) -> Option<ty::Const<'tcx>> {
match self.unpack() {
GenericArgKind::Const(ct) => Some(ct),
_ => None,
}
}
pub fn expect_region(self) -> ty::Region<'tcx> {
self.as_region().unwrap_or_else(|| bug!("expected a region, but found another kind"))
}
pub fn expect_ty(self) -> Ty<'tcx> {
self.as_type().unwrap_or_else(|| bug!("expected a type, but found another kind"))
}
pub fn expect_const(self) -> ty::Const<'tcx> {
self.as_const().unwrap_or_else(|| bug!("expected a const, but found another kind"))
}
pub fn is_non_region_infer(self) -> bool {
match self.unpack() {
GenericArgKind::Lifetime(_) => false,
GenericArgKind::Type(ty) => ty.is_ty_or_numeric_infer(),
GenericArgKind::Const(ct) => ct.is_ct_infer(),
}
}
}
impl<'a, 'tcx> Lift<TyCtxt<'tcx>> for GenericArg<'a> {
type Lifted = GenericArg<'tcx>;
fn lift_to_interner(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
match self.unpack() {
GenericArgKind::Lifetime(lt) => tcx.lift(lt).map(|lt| lt.into()),
GenericArgKind::Type(ty) => tcx.lift(ty).map(|ty| ty.into()),
GenericArgKind::Const(ct) => tcx.lift(ct).map(|ct| ct.into()),
}
}
}
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for GenericArg<'tcx> {
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
folder: &mut F,
) -> Result<Self, F::Error> {
match self.unpack() {
GenericArgKind::Lifetime(lt) => lt.try_fold_with(folder).map(Into::into),
GenericArgKind::Type(ty) => ty.try_fold_with(folder).map(Into::into),
GenericArgKind::Const(ct) => ct.try_fold_with(folder).map(Into::into),
}
}
}
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for GenericArg<'tcx> {
fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>(&self, visitor: &mut V) -> V::Result {
match self.unpack() {
GenericArgKind::Lifetime(lt) => lt.visit_with(visitor),
GenericArgKind::Type(ty) => ty.visit_with(visitor),
GenericArgKind::Const(ct) => ct.visit_with(visitor),
}
}
}
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for GenericArg<'tcx> {
fn encode(&self, e: &mut E) {
self.unpack().encode(e)
}
}
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for GenericArg<'tcx> {
fn decode(d: &mut D) -> GenericArg<'tcx> {
GenericArgKind::decode(d).pack()
}
}
pub type GenericArgs<'tcx> = List<GenericArg<'tcx>>;
pub type GenericArgsRef<'tcx> = &'tcx GenericArgs<'tcx>;
impl<'tcx> GenericArgs<'tcx> {
pub fn into_type_list(&self, tcx: TyCtxt<'tcx>) -> &'tcx List<Ty<'tcx>> {
tcx.mk_type_list_from_iter(self.iter().map(|arg| match arg.unpack() {
GenericArgKind::Type(ty) => ty,
_ => bug!("`into_type_list` called on generic arg with non-types"),
}))
}
pub fn as_closure(&'tcx self) -> ClosureArgs<TyCtxt<'tcx>> {
ClosureArgs { args: self }
}
pub fn as_coroutine_closure(&'tcx self) -> CoroutineClosureArgs<TyCtxt<'tcx>> {
CoroutineClosureArgs { args: self }
}
pub fn as_coroutine(&'tcx self) -> CoroutineArgs<TyCtxt<'tcx>> {
CoroutineArgs { args: self }
}
pub fn as_inline_const(&'tcx self) -> InlineConstArgs<'tcx> {
InlineConstArgs { args: self }
}
pub fn identity_for_item(tcx: TyCtxt<'tcx>, def_id: impl Into<DefId>) -> GenericArgsRef<'tcx> {
Self::for_item(tcx, def_id.into(), |param, _| tcx.mk_param_from_def(param))
}
pub fn for_item<F>(tcx: TyCtxt<'tcx>, def_id: DefId, mut mk_kind: F) -> GenericArgsRef<'tcx>
where
F: FnMut(&ty::GenericParamDef, &[GenericArg<'tcx>]) -> GenericArg<'tcx>,
{
let defs = tcx.generics_of(def_id);
let count = defs.count();
let mut args = SmallVec::with_capacity(count);
Self::fill_item(&mut args, tcx, defs, &mut mk_kind);
tcx.mk_args(&args)
}
pub fn extend_to<F>(
&self,
tcx: TyCtxt<'tcx>,
def_id: DefId,
mut mk_kind: F,
) -> GenericArgsRef<'tcx>
where
F: FnMut(&ty::GenericParamDef, &[GenericArg<'tcx>]) -> GenericArg<'tcx>,
{
Self::for_item(tcx, def_id, |param, args| {
self.get(param.index as usize).cloned().unwrap_or_else(|| mk_kind(param, args))
})
}
pub fn fill_item<F>(
args: &mut SmallVec<[GenericArg<'tcx>; 8]>,
tcx: TyCtxt<'tcx>,
defs: &ty::Generics,
mk_kind: &mut F,
) where
F: FnMut(&ty::GenericParamDef, &[GenericArg<'tcx>]) -> GenericArg<'tcx>,
{
if let Some(def_id) = defs.parent {
let parent_defs = tcx.generics_of(def_id);
Self::fill_item(args, tcx, parent_defs, mk_kind);
}
Self::fill_single(args, defs, mk_kind)
}
pub fn fill_single<F>(
args: &mut SmallVec<[GenericArg<'tcx>; 8]>,
defs: &ty::Generics,
mk_kind: &mut F,
) where
F: FnMut(&ty::GenericParamDef, &[GenericArg<'tcx>]) -> GenericArg<'tcx>,
{
args.reserve(defs.own_params.len());
for param in &defs.own_params {
let kind = mk_kind(param, args);
assert_eq!(param.index as usize, args.len(), "{args:#?}, {defs:#?}");
args.push(kind);
}
}
pub fn extend_with_error(
tcx: TyCtxt<'tcx>,
def_id: DefId,
original_args: &[GenericArg<'tcx>],
) -> GenericArgsRef<'tcx> {
ty::GenericArgs::for_item(tcx, def_id, |def, _| {
if let Some(arg) = original_args.get(def.index as usize) {
*arg
} else {
def.to_error(tcx)
}
})
}
#[inline]
pub fn types(&'tcx self) -> impl DoubleEndedIterator<Item = Ty<'tcx>> + 'tcx {
self.iter().filter_map(|k| k.as_type())
}
#[inline]
pub fn regions(&'tcx self) -> impl DoubleEndedIterator<Item = ty::Region<'tcx>> + 'tcx {
self.iter().filter_map(|k| k.as_region())
}
#[inline]
pub fn consts(&'tcx self) -> impl DoubleEndedIterator<Item = ty::Const<'tcx>> + 'tcx {
self.iter().filter_map(|k| k.as_const())
}
#[inline]
pub fn non_erasable_generics(
&'tcx self,
tcx: TyCtxt<'tcx>,
def_id: DefId,
) -> impl DoubleEndedIterator<Item = GenericArgKind<'tcx>> + 'tcx {
let generics = tcx.generics_of(def_id);
self.iter().enumerate().filter_map(|(i, k)| match k.unpack() {
_ if Some(i) == generics.host_effect_index => None,
ty::GenericArgKind::Lifetime(_) => None,
generic => Some(generic),
})
}
#[inline]
#[track_caller]
pub fn type_at(&self, i: usize) -> Ty<'tcx> {
self[i].as_type().unwrap_or_else(|| bug!("expected type for param #{} in {:?}", i, self))
}
#[inline]
#[track_caller]
pub fn region_at(&self, i: usize) -> ty::Region<'tcx> {
self[i]
.as_region()
.unwrap_or_else(|| bug!("expected region for param #{} in {:?}", i, self))
}
#[inline]
#[track_caller]
pub fn const_at(&self, i: usize) -> ty::Const<'tcx> {
self[i].as_const().unwrap_or_else(|| bug!("expected const for param #{} in {:?}", i, self))
}
#[inline]
#[track_caller]
pub fn type_for_def(&self, def: &ty::GenericParamDef) -> GenericArg<'tcx> {
self.type_at(def.index as usize).into()
}
pub fn rebase_onto(
&self,
tcx: TyCtxt<'tcx>,
source_ancestor: DefId,
target_args: GenericArgsRef<'tcx>,
) -> GenericArgsRef<'tcx> {
let defs = tcx.generics_of(source_ancestor);
tcx.mk_args_from_iter(target_args.iter().chain(self.iter().skip(defs.count())))
}
pub fn truncate_to(&self, tcx: TyCtxt<'tcx>, generics: &ty::Generics) -> GenericArgsRef<'tcx> {
tcx.mk_args_from_iter(self.iter().take(generics.count()))
}
pub fn print_as_list(&self) -> String {
let v = self.iter().map(|arg| arg.to_string()).collect::<Vec<_>>();
format!("[{}]", v.join(", "))
}
}
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for GenericArgsRef<'tcx> {
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
folder: &mut F,
) -> Result<Self, F::Error> {
match self.len() {
1 => {
let param0 = self[0].try_fold_with(folder)?;
if param0 == self[0] { Ok(self) } else { Ok(folder.cx().mk_args(&[param0])) }
}
2 => {
let param0 = self[0].try_fold_with(folder)?;
let param1 = self[1].try_fold_with(folder)?;
if param0 == self[0] && param1 == self[1] {
Ok(self)
} else {
Ok(folder.cx().mk_args(&[param0, param1]))
}
}
0 => Ok(self),
_ => ty::util::fold_list(self, folder, |tcx, v| tcx.mk_args(v)),
}
}
}
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for &'tcx ty::List<Ty<'tcx>> {
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
folder: &mut F,
) -> Result<Self, F::Error> {
match self.len() {
2 => {
let param0 = self[0].try_fold_with(folder)?;
let param1 = self[1].try_fold_with(folder)?;
if param0 == self[0] && param1 == self[1] {
Ok(self)
} else {
Ok(folder.cx().mk_type_list(&[param0, param1]))
}
}
_ => ty::util::fold_list(self, folder, |tcx, v| tcx.mk_type_list(v)),
}
}
}
impl<'tcx, T: TypeVisitable<TyCtxt<'tcx>>> TypeVisitable<TyCtxt<'tcx>> for &'tcx ty::List<T> {
#[inline]
fn visit_with<V: TypeVisitor<TyCtxt<'tcx>>>(&self, visitor: &mut V) -> V::Result {
walk_visitable_list!(visitor, self.iter());
V::Result::output()
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
#[derive(HashStable, TypeFoldable, TypeVisitable)]
pub struct UserArgs<'tcx> {
pub args: GenericArgsRef<'tcx>,
pub user_self_ty: Option<UserSelfTy<'tcx>>,
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
#[derive(HashStable, TypeFoldable, TypeVisitable)]
pub struct UserSelfTy<'tcx> {
pub impl_def_id: DefId,
pub self_ty: Ty<'tcx>,
}