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Store impl_trait_fn inside OpaqueTyOrigin.

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This commit is contained in:
Camille GILLOT 2021-11-30 19:11:35 +01:00
parent 72b6f7049c
commit 8576ab45e4
13 changed files with 119 additions and 97 deletions
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9
compiler/rustc_ast_lowering/src/item.rs
View File

@ -247,12 +247,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
AnonymousLifetimeMode::PassThrough,
|this, idty| {
let ret_id = asyncness.opt_return_id();
this.lower_fn_decl(
&decl,
Some((fn_def_id.to_def_id(), idty)),
true,
ret_id,
)
this.lower_fn_decl(&decl, Some((fn_def_id, idty)), true, ret_id)
},
);
let sig = hir::FnSig {
@ -1264,7 +1259,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
|this, idty| {
this.lower_fn_decl(
&sig.decl,
Some((fn_def_id.to_def_id(), idty)),
Some((fn_def_id, idty)),
impl_trait_return_allow,
is_async,
)

25
compiler/rustc_ast_lowering/src/lib.rs
View File

@ -228,7 +228,7 @@ enum ImplTraitContext<'b, 'a> {
ReturnPositionOpaqueTy {
/// `DefId` for the parent function, used to look up necessary
/// information later.
fn_def_id: DefId,
fn_def_id: LocalDefId,
/// Origin: Either OpaqueTyOrigin::FnReturn or OpaqueTyOrigin::AsyncFn,
origin: hir::OpaqueTyOrigin,
},
@ -1377,7 +1377,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
fn lower_opaque_impl_trait(
&mut self,
span: Span,
fn_def_id: Option<DefId>,
fn_def_id: Option<LocalDefId>,
origin: hir::OpaqueTyOrigin,
opaque_ty_node_id: NodeId,
capturable_lifetimes: Option<&FxHashSet<hir::LifetimeName>>,
@ -1449,7 +1449,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
span: lctx.lower_span(span),
},
bounds: hir_bounds,
impl_trait_fn: fn_def_id,
origin,
};
@ -1519,7 +1518,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
fn lower_fn_decl(
&mut self,
decl: &FnDecl,
mut in_band_ty_params: Option<(DefId, &mut Vec<hir::GenericParam<'hir>>)>,
mut in_band_ty_params: Option<(LocalDefId, &mut Vec<hir::GenericParam<'hir>>)>,
impl_trait_return_allow: bool,
make_ret_async: Option<NodeId>,
) -> &'hir hir::FnDecl<'hir> {
@ -1577,7 +1576,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
Some((def_id, _)) if impl_trait_return_allow => {
ImplTraitContext::ReturnPositionOpaqueTy {
fn_def_id: def_id,
origin: hir::OpaqueTyOrigin::FnReturn,
origin: hir::OpaqueTyOrigin::FnReturn(def_id),
}
}
_ => ImplTraitContext::disallowed(),
@ -1632,7 +1631,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
fn lower_async_fn_ret_ty(
&mut self,
output: &FnRetTy,
fn_def_id: DefId,
fn_def_id: LocalDefId,
opaque_ty_node_id: NodeId,
) -> hir::FnRetTy<'hir> {
debug!(
@ -1747,8 +1746,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
span: this.lower_span(span),
},
bounds: arena_vec![this; future_bound],
impl_trait_fn: Some(fn_def_id),
origin: hir::OpaqueTyOrigin::AsyncFn,
origin: hir::OpaqueTyOrigin::AsyncFn(fn_def_id),
};
trace!("exist ty from async fn def id: {:#?}", opaque_ty_def_id);
@ -1794,7 +1792,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
fn lower_async_fn_output_type_to_future_bound(
&mut self,
output: &FnRetTy,
fn_def_id: DefId,
fn_def_id: LocalDefId,
span: Span,
) -> hir::GenericBound<'hir> {
// Compute the `T` in `Future<Output = T>` from the return type.
@ -1805,7 +1803,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// generates.
let context = ImplTraitContext::ReturnPositionOpaqueTy {
fn_def_id,
origin: hir::OpaqueTyOrigin::FnReturn,
origin: hir::OpaqueTyOrigin::FnReturn(fn_def_id),
};
self.lower_ty(ty, context)
}
@ -2442,17 +2440,12 @@ impl<'hir> GenericArgsCtor<'hir> {
}
}
#[tracing::instrument(level = "debug")]
fn lifetimes_from_impl_trait_bounds(
opaque_ty_id: NodeId,
bounds: hir::GenericBounds<'_>,
lifetimes_to_include: Option<&FxHashSet<hir::LifetimeName>>,
) -> Vec<(hir::LifetimeName, Span)> {
debug!(
"lifetimes_from_impl_trait_bounds(opaque_ty_id={:?}, \
bounds={:#?})",
opaque_ty_id, bounds,
);
// This visitor walks over `impl Trait` bounds and creates defs for all lifetimes that
// appear in the bounds, excluding lifetimes that are created within the bounds.
// E.g., `'a`, `'b`, but not `'c` in `impl for<'c> SomeTrait<'a, 'b, 'c>`.

2
compiler/rustc_borrowck/src/region_infer/opaque_types.rs
View File

@ -173,7 +173,7 @@ fn check_opaque_type_parameter_valid(
// fn foo<l0..'ln>() -> foo::<'static..'static>::Foo<'l0..'lm>.
//
// which would error here on all of the `'static` args.
OpaqueTyOrigin::FnReturn | OpaqueTyOrigin::AsyncFn => return true,
OpaqueTyOrigin::FnReturn(..) | OpaqueTyOrigin::AsyncFn(..) => return true,
// Check these
OpaqueTyOrigin::TyAlias => {}
}

9
compiler/rustc_hir/src/hir.rs
View File

@ -2248,7 +2248,6 @@ pub struct BareFnTy<'hir> {
pub struct OpaqueTy<'hir> {
pub generics: Generics<'hir>,
pub bounds: GenericBounds<'hir>,
pub impl_trait_fn: Option<DefId>,
pub origin: OpaqueTyOrigin,
}
@ -2256,9 +2255,9 @@ pub struct OpaqueTy<'hir> {
#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
pub enum OpaqueTyOrigin {
/// `-> impl Trait`
FnReturn,
FnReturn(LocalDefId),
/// `async fn`
AsyncFn,
AsyncFn(LocalDefId),
/// type aliases: `type Foo = impl Trait;`
TyAlias,
}
@ -2809,7 +2808,9 @@ impl ItemKind<'_> {
Some(match *self {
ItemKind::Fn(_, ref generics, _)
| ItemKind::TyAlias(_, ref generics)
| ItemKind::OpaqueTy(OpaqueTy { ref generics, impl_trait_fn: None, .. })
| ItemKind::OpaqueTy(OpaqueTy {
ref generics, origin: OpaqueTyOrigin::TyAlias, ..
})
| ItemKind::Enum(_, ref generics)
| ItemKind::Struct(_, ref generics)
| ItemKind::Union(_, ref generics)

2
compiler/rustc_infer/src/infer/error_reporting/nice_region_error/util.rs
View File

@ -107,7 +107,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
kind:
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
bounds,
origin: hir::OpaqueTyOrigin::AsyncFn,
origin: hir::OpaqueTyOrigin::AsyncFn(..),
..
}),
..

22
compiler/rustc_infer/src/infer/opaque_types.rs
View File

@ -276,7 +276,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
debug!(?concrete_ty);
let first_own_region = match opaque_defn.origin {
hir::OpaqueTyOrigin::FnReturn | hir::OpaqueTyOrigin::AsyncFn => {
hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..) => {
// We lower
//
// fn foo<'l0..'ln>() -> impl Trait<'l0..'lm>
@ -463,20 +463,24 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
let parent_def_id = self.infcx.defining_use_anchor;
let (in_definition_scope, origin) = match tcx.hir().expect_item(def_id).kind
{
// Async `impl Trait`
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
origin: hir::OpaqueTyOrigin::AsyncFn(parent),
..
}) => (parent == parent_def_id, hir::OpaqueTyOrigin::AsyncFn(parent)),
// Anonymous `impl Trait`
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
impl_trait_fn: Some(parent),
origin,
origin: hir::OpaqueTyOrigin::FnReturn(parent),
..
}) => (parent == parent_def_id.to_def_id(), origin),
}) => (parent == parent_def_id, hir::OpaqueTyOrigin::FnReturn(parent)),
// Named `type Foo = impl Bar;`
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
impl_trait_fn: None,
origin,
origin: hir::OpaqueTyOrigin::TyAlias,
..
}) => {
(may_define_opaque_type(tcx, parent_def_id, opaque_hir_id), origin)
}
}) => (
may_define_opaque_type(tcx, parent_def_id, opaque_hir_id),
hir::OpaqueTyOrigin::TyAlias,
),
ref itemkind => {
span_bug!(
self.value_span,

18
compiler/rustc_middle/src/ty/mod.rs
View File

@ -2055,13 +2055,17 @@ impl<'tcx> TyCtxt<'tcx> {
}
}
/// Yields the parent function's `DefId` if `def_id` is an `impl Trait` definition.
pub fn is_impl_trait_defn(tcx: TyCtxt<'_>, def_id: DefId) -> Option<DefId> {
if let Some(def_id) = def_id.as_local() {
if let Node::Item(item) = tcx.hir().get(tcx.hir().local_def_id_to_hir_id(def_id)) {
if let hir::ItemKind::OpaqueTy(ref opaque_ty) = item.kind {
return opaque_ty.impl_trait_fn;
}
/// Yields the parent function's `LocalDefId` if `def_id` is an `impl Trait` definition.
pub fn is_impl_trait_defn(tcx: TyCtxt<'_>, def_id: DefId) -> Option<LocalDefId> {
let def_id = def_id.as_local()?;
if let Node::Item(item) = tcx.hir().get(tcx.hir().local_def_id_to_hir_id(def_id)) {
if let hir::ItemKind::OpaqueTy(ref opaque_ty) = item.kind {
return match opaque_ty.origin {
hir::OpaqueTyOrigin::FnReturn(parent) | hir::OpaqueTyOrigin::AsyncFn(parent) => {
Some(parent)
}
hir::OpaqueTyOrigin::TyAlias => None,
};
}
}
None

15
compiler/rustc_resolve/src/late/lifetimes.rs
View File

@ -968,7 +968,10 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
let (generics, bounds) = match opaque_ty.kind {
// Named opaque `impl Trait` types are reached via `TyKind::Path`.
// This arm is for `impl Trait` in the types of statics, constants and locals.
hir::ItemKind::OpaqueTy(hir::OpaqueTy { impl_trait_fn: None, .. }) => {
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
origin: hir::OpaqueTyOrigin::TyAlias,
..
}) => {
intravisit::walk_ty(self, ty);
// Elided lifetimes are not allowed in non-return
@ -985,7 +988,7 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
}
// RPIT (return position impl trait)
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
impl_trait_fn: Some(_),
origin: hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..),
ref generics,
bounds,
..
@ -1695,7 +1698,11 @@ fn compute_object_lifetime_defaults(
hir::ItemKind::Struct(_, ref generics)
| hir::ItemKind::Union(_, ref generics)
| hir::ItemKind::Enum(_, ref generics)
| hir::ItemKind::OpaqueTy(hir::OpaqueTy { ref generics, impl_trait_fn: None, .. })
| hir::ItemKind::OpaqueTy(hir::OpaqueTy {
ref generics,
origin: hir::OpaqueTyOrigin::TyAlias,
..
})
| hir::ItemKind::TyAlias(_, ref generics)
| hir::ItemKind::Trait(_, _, ref generics, ..) => {
let result = object_lifetime_defaults_for_item(tcx, generics);
@ -2067,7 +2074,7 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
..
}) = self.tcx.hir().get(parent_hir_id)
{
if opaque.origin != hir::OpaqueTyOrigin::AsyncFn {
if !matches!(opaque.origin, hir::OpaqueTyOrigin::AsyncFn(..)) {
continue 'lifetimes;
}
// We want to do this only if the liftime identifier is already defined

4
compiler/rustc_ty_utils/src/ty.rs
View File

@ -248,7 +248,7 @@ fn trait_of_item(tcx: TyCtxt<'_>, def_id: DefId) -> Option<DefId> {
fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
// The param_env of an impl Trait type is its defining function's param_env
if let Some(parent) = ty::is_impl_trait_defn(tcx, def_id) {
return param_env(tcx, parent);
return param_env(tcx, parent.to_def_id());
}
// Compute the bounds on Self and the type parameters.
@ -313,7 +313,7 @@ fn well_formed_types_in_env<'tcx>(
// The environment of an impl Trait type is its defining function's environment.
if let Some(parent) = ty::is_impl_trait_defn(tcx, def_id) {
return well_formed_types_in_env(tcx, parent);
return well_formed_types_in_env(tcx, parent.to_def_id());
}
// Compute the bounds on `Self` and the type parameters.

13
compiler/rustc_typeck/src/astconv/mod.rs
View File

@ -2336,9 +2336,16 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
let def_id = item_id.def_id.to_def_id();
match opaque_ty.kind {
hir::ItemKind::OpaqueTy(hir::OpaqueTy { impl_trait_fn, .. }) => {
self.impl_trait_ty_to_ty(def_id, lifetimes, impl_trait_fn.is_some())
}
hir::ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => self
.impl_trait_ty_to_ty(
def_id,
lifetimes,
matches!(
origin,
hir::OpaqueTyOrigin::FnReturn(..)
| hir::OpaqueTyOrigin::AsyncFn(..)
),
),
ref i => bug!("`impl Trait` pointed to non-opaque type?? {:#?}", i),
}
}

8
compiler/rustc_typeck/src/check/check.rs
View File

@ -541,7 +541,7 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
}
if let ItemKind::OpaqueTy(hir::OpaqueTy {
origin: hir::OpaqueTyOrigin::AsyncFn | hir::OpaqueTyOrigin::FnReturn,
origin: hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::FnReturn(..),
..
}) = item.kind
{
@ -567,7 +567,7 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
visitor.visit_item(&item);
let is_async = match item.kind {
ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => {
matches!(origin, hir::OpaqueTyOrigin::AsyncFn)
matches!(origin, hir::OpaqueTyOrigin::AsyncFn(..))
}
_ => unreachable!(),
};
@ -604,7 +604,7 @@ pub(super) fn check_opaque_for_cycles<'tcx>(
) -> Result<(), ErrorReported> {
if tcx.try_expand_impl_trait_type(def_id.to_def_id(), substs).is_err() {
match origin {
hir::OpaqueTyOrigin::AsyncFn => async_opaque_type_cycle_error(tcx, span),
hir::OpaqueTyOrigin::AsyncFn(..) => async_opaque_type_cycle_error(tcx, span),
_ => opaque_type_cycle_error(tcx, def_id, span),
}
Err(ErrorReported)
@ -635,7 +635,7 @@ fn check_opaque_meets_bounds<'tcx>(
) {
match origin {
// Checked when type checking the function containing them.
hir::OpaqueTyOrigin::FnReturn | hir::OpaqueTyOrigin::AsyncFn => return,
hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..) => return,
// Can have different predicates to their defining use
hir::OpaqueTyOrigin::TyAlias => {}
}

81
compiler/rustc_typeck/src/collect.rs
View File

@ -594,7 +594,11 @@ fn type_param_predicates(
ItemKind::Fn(.., ref generics, _)
| ItemKind::Impl(hir::Impl { ref generics, .. })
| ItemKind::TyAlias(_, ref generics)
| ItemKind::OpaqueTy(OpaqueTy { ref generics, impl_trait_fn: None, .. })
| ItemKind::OpaqueTy(OpaqueTy {
ref generics,
origin: hir::OpaqueTyOrigin::TyAlias,
..
})
| ItemKind::Enum(_, ref generics)
| ItemKind::Struct(_, ref generics)
| ItemKind::Union(_, ref generics) => generics,
@ -793,7 +797,10 @@ fn convert_item(tcx: TyCtxt<'_>, item_id: hir::ItemId) {
}
// Desugared from `impl Trait`, so visited by the function's return type.
hir::ItemKind::OpaqueTy(hir::OpaqueTy { impl_trait_fn: Some(_), .. }) => {}
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..),
..
}) => {}
// Don't call `type_of` on opaque types, since that depends on type
// checking function bodies. `check_item_type` ensures that it's called
@ -1488,15 +1495,18 @@ fn generics_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::Generics {
Some(tcx.typeck_root_def_id(def_id))
}
Node::Item(item) => match item.kind {
ItemKind::OpaqueTy(hir::OpaqueTy { impl_trait_fn, .. }) => {
impl_trait_fn.or_else(|| {
let parent_id = tcx.hir().get_parent_item(hir_id);
assert!(parent_id != hir_id && parent_id != CRATE_HIR_ID);
debug!("generics_of: parent of opaque ty {:?} is {:?}", def_id, parent_id);
// Opaque types are always nested within another item, and
// inherit the generics of the item.
Some(tcx.hir().local_def_id(parent_id).to_def_id())
})
ItemKind::OpaqueTy(hir::OpaqueTy {
origin:
hir::OpaqueTyOrigin::FnReturn(fn_def_id) | hir::OpaqueTyOrigin::AsyncFn(fn_def_id),
..
}) => Some(fn_def_id.to_def_id()),
ItemKind::OpaqueTy(hir::OpaqueTy { origin: hir::OpaqueTyOrigin::TyAlias, .. }) => {
let parent_id = tcx.hir().get_parent_item(hir_id);
assert!(parent_id != hir_id && parent_id != CRATE_HIR_ID);
debug!("generics_of: parent of opaque ty {:?} is {:?}", def_id, parent_id);
// Opaque types are always nested within another item, and
// inherit the generics of the item.
Some(tcx.hir().local_def_id(parent_id).to_def_id())
}
_ => None,
},
@ -2051,31 +2061,32 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::GenericP
generics
}
ItemKind::OpaqueTy(OpaqueTy {
bounds: _,
impl_trait_fn,
ref generics,
origin: _,
origin: hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::FnReturn(..),
..
}) => {
if impl_trait_fn.is_some() {
// return-position impl trait
//
// We don't inherit predicates from the parent here:
// If we have, say `fn f<'a, T: 'a>() -> impl Sized {}`
// then the return type is `f::<'static, T>::{{opaque}}`.
//
// If we inherited the predicates of `f` then we would
// require that `T: 'static` to show that the return
// type is well-formed.
//
// The only way to have something with this opaque type
// is from the return type of the containing function,
// which will ensure that the function's predicates
// hold.
return ty::GenericPredicates { parent: None, predicates: &[] };
} else {
// type-alias impl trait
generics
}
// return-position impl trait
//
// We don't inherit predicates from the parent here:
// If we have, say `fn f<'a, T: 'a>() -> impl Sized {}`
// then the return type is `f::<'static, T>::{{opaque}}`.
//
// If we inherited the predicates of `f` then we would
// require that `T: 'static` to show that the return
// type is well-formed.
//
// The only way to have something with this opaque type
// is from the return type of the containing function,
// which will ensure that the function's predicates
// hold.
return ty::GenericPredicates { parent: None, predicates: &[] };
}
ItemKind::OpaqueTy(OpaqueTy {
ref generics,
origin: hir::OpaqueTyOrigin::TyAlias,
..
}) => {
// type-alias impl trait
generics
}
_ => NO_GENERICS,

8
compiler/rustc_typeck/src/collect/type_of.rs
View File

@ -394,13 +394,13 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: DefId) -> Ty<'_> {
let substs = InternalSubsts::identity_for_item(tcx, def_id.to_def_id());
tcx.mk_adt(def, substs)
}
ItemKind::OpaqueTy(OpaqueTy { impl_trait_fn: None, .. }) => {
ItemKind::OpaqueTy(OpaqueTy { origin: hir::OpaqueTyOrigin::TyAlias, .. }) => {
find_opaque_ty_constraints(tcx, def_id)
}
// Opaque types desugared from `impl Trait`.
ItemKind::OpaqueTy(OpaqueTy { impl_trait_fn: Some(owner), .. }) => {
ItemKind::OpaqueTy(OpaqueTy { origin: hir::OpaqueTyOrigin::FnReturn(owner) | hir::OpaqueTyOrigin::AsyncFn(owner), .. }) => {
let concrete_ty = tcx
.mir_borrowck(owner.expect_local())
.mir_borrowck(owner)
.concrete_opaque_types
.get_value_matching(|(key, _)| key.def_id == def_id.to_def_id())
.copied()
@ -413,7 +413,7 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: DefId) -> Ty<'_> {
),
);
if let Some(ErrorReported) =
tcx.typeck(owner.expect_local()).tainted_by_errors
tcx.typeck(owner).tainted_by_errors
{
// Some error in the
// owner fn prevented us from populating