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Make type_implements_trait not a query

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This commit is contained in:
Aman Arora 2021-07-06 05:38:15 -04:00
parent 969a6c2481
commit 8ef5212eff
10 changed files with 141 additions and 107 deletions
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19
compiler/rustc_middle/src/query/mod.rs
View File

@ -1559,25 +1559,6 @@ rustc_queries! {
desc { "evaluating trait selection obligation `{}`", goal.value }
}
/// Evaluates whether the given type implements the given trait
/// in the given environment.
///
/// The inputs are:
///
/// - the def-id of the trait
/// - the self type
/// - the *other* type parameters of the trait, excluding the self-type
/// - the parameter environment
///
/// FIXME. If the type, trait, or environment has inference variables,
/// this yields `EvaluatedToUnknown`. It should be refactored
/// to use canonicalization, really.
query type_implements_trait(
key: (DefId, Ty<'tcx>, SubstsRef<'tcx>, ty::ParamEnv<'tcx>, )
) -> traits::EvaluationResult {
desc { "evaluating `type_implements_trait` `{:?}`", key }
}
/// Do not call this query directly: part of the `Eq` type-op
query type_op_ascribe_user_type(
goal: CanonicalTypeOpAscribeUserTypeGoal<'tcx>

6
compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs
View File

@ -13,6 +13,7 @@ use rustc_middle::ty::{self, suggest_constraining_type_param, Ty};
use rustc_span::source_map::DesugaringKind;
use rustc_span::symbol::sym;
use rustc_span::{Span, DUMMY_SP};
use rustc_trait_selection::infer::InferCtxtExt;
use crate::dataflow::drop_flag_effects;
use crate::dataflow::indexes::{MoveOutIndex, MovePathIndex};
@ -1330,8 +1331,9 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
// to avoid panics
if let Some(iter_trait) = tcx.get_diagnostic_item(sym::Iterator) {
if tcx
.type_implements_trait((iter_trait, return_ty, ty_params, self.param_env))
if self
.infcx
.type_implements_trait(iter_trait, return_ty, ty_params, self.param_env)
.must_apply_modulo_regions()
{
if let Ok(snippet) = tcx.sess.source_map().span_to_snippet(return_span) {

45
compiler/rustc_trait_selection/src/infer.rs
View File

@ -1,13 +1,18 @@
use crate::traits::query::evaluate_obligation::InferCtxtExt as _;
use crate::traits::query::outlives_bounds::InferCtxtExt as _;
use crate::traits::{self, TraitEngine, TraitEngineExt};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_hir::lang_items::LangItem;
use rustc_infer::infer::outlives::env::OutlivesEnvironment;
use rustc_infer::traits::ObligationCause;
use rustc_middle::arena::ArenaAllocatable;
use rustc_middle::infer::canonical::{Canonical, CanonicalizedQueryResponse, QueryResponse};
use rustc_middle::traits::query::Fallible;
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::ToPredicate;
use rustc_middle::ty::WithConstness;
use rustc_middle::ty::{self, Ty, TypeFoldable};
use rustc_span::{Span, DUMMY_SP};
@ -32,8 +37,22 @@ pub trait InferCtxtExt<'tcx> {
) -> InferOk<'tcx, T>
where
T: TypeFoldable<'tcx>;
}
/// Check whether a `ty` implements given trait(trait_def_id).
/// The inputs are:
///
/// - the def-id of the trait
/// - the self type
/// - the *other* type parameters of the trait, excluding the self-type
/// - the parameter environment
fn type_implements_trait(
&self,
trait_def_id: DefId,
ty: Ty<'tcx>,
params: SubstsRef<'tcx>,
param_env: ty::ParamEnv<'tcx>,
) -> traits::EvaluationResult;
}
impl<'cx, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'cx, 'tcx> {
fn type_is_copy_modulo_regions(
&self,
@ -79,6 +98,30 @@ impl<'cx, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'cx, 'tcx> {
);
InferOk { value, obligations }
}
fn type_implements_trait(
&self,
trait_def_id: DefId,
ty: Ty<'tcx>,
params: SubstsRef<'tcx>,
param_env: ty::ParamEnv<'tcx>,
) -> traits::EvaluationResult {
debug!(
"type_implements_trait: trait_def_id={:?}, type={:?}, params={:?}, param_env={:?}",
trait_def_id, ty, params, param_env
);
let trait_ref =
ty::TraitRef { def_id: trait_def_id, substs: self.tcx.mk_substs_trait(ty, params) };
let obligation = traits::Obligation {
cause: traits::ObligationCause::dummy(),
param_env,
recursion_depth: 0,
predicate: trait_ref.without_const().to_predicate(self.tcx),
};
self.evaluate_obligation_no_overflow(&obligation)
}
}
pub trait InferCtxtBuilderExt<'tcx> {

5
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
View File

@ -28,6 +28,7 @@ use rustc_target::spec::abi;
use std::fmt;
use super::InferCtxtPrivExt;
use crate::infer::InferCtxtExt as _;
use crate::traits::query::evaluate_obligation::InferCtxtExt as _;
use rustc_middle::ty::print::with_no_trimmed_paths;
@ -2349,12 +2350,12 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
}
let self_ty = self.tcx.erase_regions(self_ty);
let impls_future = self.tcx.type_implements_trait((
let impls_future = self.type_implements_trait(
future_trait,
self_ty.skip_binder(),
ty::List::empty(),
obligation.param_env,
));
);
let item_def_id = self
.tcx

41
compiler/rustc_trait_selection/src/traits/mod.rs
View File

@ -31,7 +31,7 @@ use rustc_hir::def_id::DefId;
use rustc_middle::ty::fold::TypeFoldable;
use rustc_middle::ty::subst::{InternalSubsts, SubstsRef};
use rustc_middle::ty::{
self, GenericParamDefKind, ParamEnv, ToPredicate, Ty, TyCtxt, VtblEntry, WithConstness,
self, GenericParamDefKind, ToPredicate, Ty, TyCtxt, VtblEntry, WithConstness,
COMMON_VTABLE_ENTRIES,
};
use rustc_span::Span;
@ -541,44 +541,6 @@ fn vtable_trait_first_method_offset<'tcx>(
vtable_base
}
/// Check whether a `ty` implements given trait(trait_def_id).
/// See query definition for details.
fn type_implements_trait<'tcx>(
tcx: TyCtxt<'tcx>,
key: (
DefId, // trait_def_id,
Ty<'tcx>, // type
SubstsRef<'tcx>,
ParamEnv<'tcx>,
),
) -> EvaluationResult {
let (trait_def_id, ty, params, param_env) = key;
debug!(
"type_implements_trait: trait_def_id={:?}, type={:?}, params={:?}, param_env={:?}",
trait_def_id, ty, params, param_env
);
let trait_ref = ty::TraitRef { def_id: trait_def_id, substs: tcx.mk_substs_trait(ty, params) };
// FIXME(#86868): If there are inference variables anywhere, just give up and assume
// we don't know the answer. This works around the ICEs that would result from
// using those inference variables within the `infer_ctxt` we create below.
// Really we should be using canonicalized variables, or perhaps removing
// this query altogether.
if (trait_ref, param_env).needs_infer() {
return EvaluationResult::EvaluatedToUnknown;
}
let obligation = Obligation {
cause: ObligationCause::dummy(),
param_env,
recursion_depth: 0,
predicate: trait_ref.without_const().to_predicate(tcx),
};
tcx.infer_ctxt().enter(|infcx| infcx.evaluate_obligation_no_overflow(&obligation))
}
pub fn provide(providers: &mut ty::query::Providers) {
object_safety::provide(providers);
structural_match::provide(providers);
@ -587,7 +549,6 @@ pub fn provide(providers: &mut ty::query::Providers) {
specializes: specialize::specializes,
codegen_fulfill_obligation: codegen::codegen_fulfill_obligation,
vtable_entries,
type_implements_trait,
subst_and_check_impossible_predicates,
mir_abstract_const: |tcx, def_id| {
let def_id = def_id.expect_local();

5
compiler/rustc_typeck/src/check/cast.rs
View File

@ -45,6 +45,7 @@ use rustc_session::lint;
use rustc_session::Session;
use rustc_span::symbol::sym;
use rustc_span::Span;
use rustc_trait_selection::infer::InferCtxtExt;
use rustc_trait_selection::traits;
use rustc_trait_selection::traits::error_reporting::report_object_safety_error;
@ -441,8 +442,8 @@ impl<'a, 'tcx> CastCheck<'tcx> {
let expr_ty = fcx.tcx.erase_regions(expr_ty);
let ty_params = fcx.tcx.mk_substs_trait(expr_ty, &[]);
if fcx
.tcx
.type_implements_trait((from_trait, ty, ty_params, fcx.param_env))
.infcx
.type_implements_trait(from_trait, ty, ty_params, fcx.param_env)
.must_apply_modulo_regions()
{
label = false;

59
compiler/rustc_typeck/src/check/upvar.rs
View File

@ -42,13 +42,11 @@ use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
use rustc_infer::infer::UpvarRegion;
use rustc_middle::hir::place::{Place, PlaceBase, PlaceWithHirId, Projection, ProjectionKind};
use rustc_middle::mir::FakeReadCause;
use rustc_middle::ty::{
self, ClosureSizeProfileData, TraitRef, Ty, TyCtxt, TypeckResults, UpvarSubsts,
};
use rustc_middle::ty::{self, ClosureSizeProfileData, Ty, TyCtxt, TypeckResults, UpvarSubsts};
use rustc_session::lint;
use rustc_span::sym;
use rustc_span::{MultiSpan, Span, Symbol};
use rustc_trait_selection::traits::{Obligation, ObligationCause};
use rustc_trait_selection::infer::InferCtxtExt;
use rustc_data_structures::stable_set::FxHashSet;
use rustc_index::vec::Idx;
@ -578,29 +576,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
reasons
}
/// Returns true if `ty` may implement `trait_def_id`
fn ty_impls_trait(
&self,
ty: Ty<'tcx>,
cause: &ObligationCause<'tcx>,
trait_def_id: DefId,
) -> bool {
use crate::rustc_middle::ty::ToPredicate;
use crate::rustc_middle::ty::WithConstness;
use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
let tcx = self.infcx.tcx;
let trait_ref = TraitRef { def_id: trait_def_id, substs: tcx.mk_substs_trait(ty, &[]) };
let obligation = Obligation::new(
cause.clone(),
self.param_env,
trait_ref.without_const().to_predicate(tcx),
);
self.infcx.predicate_may_hold(&obligation)
}
/// Returns true if migration is needed for trait for the provided var_hir_id
fn need_2229_migrations_for_trait(
&self,
@ -618,10 +593,17 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
let ty = self.infcx.resolve_vars_if_possible(self.node_ty(var_hir_id));
let cause = ObligationCause::misc(self.tcx.hir().span(var_hir_id), self.body_id);
let obligation_should_hold = check_trait
.map(|check_trait| self.ty_impls_trait(ty, &cause, check_trait))
.map(|check_trait| {
self.infcx
.type_implements_trait(
check_trait,
ty,
self.tcx.mk_substs_trait(ty, &[]),
self.param_env,
)
.must_apply_modulo_regions()
})
.unwrap_or(false);
// Check whether catpured fields also implement the trait
@ -630,7 +612,16 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
let ty = capture.place.ty();
let obligation_holds_for_capture = check_trait
.map(|check_trait| self.ty_impls_trait(ty, &cause, check_trait))
.map(|check_trait| {
self.infcx
.type_implements_trait(
check_trait,
ty,
self.tcx.mk_substs_trait(ty, &[]),
self.param_env,
)
.must_apply_modulo_regions()
})
.unwrap_or(false);
if !obligation_holds_for_capture && obligation_should_hold {
@ -961,13 +952,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
let is_drop_defined_for_ty = |ty: Ty<'tcx>| {
let drop_trait = self.tcx.require_lang_item(hir::LangItem::Drop, Some(closure_span));
let ty_params = self.tcx.mk_substs_trait(base_path_ty, &[]);
self.tcx
.type_implements_trait((
self.infcx
.type_implements_trait(
drop_trait,
ty,
ty_params,
self.tcx.param_env(closure_def_id.expect_local()),
))
)
.must_apply_modulo_regions()
};

50
src/test/incremental/issue-86753.rs Normal file
View File

@ -0,0 +1,50 @@
// edition:2018
// revisions: rpass1
// Regression test for #86753. The `type_implements_trait` query (since moved to a method)
// was encountering an ICE during incremental testing when hashing its arguments.
#![warn(rust_2021_compatibility)]
use std::future::Future;
use std::pin::Pin;
use std::task::{Poll, Context};
struct LocalSet {}
struct RunUntil<'a, F> {
_local_set: &'a LocalSet,
_future: F,
}
impl<'a, F> RunUntil<'a, F> {
fn project<'pin>(self: Pin<&'pin mut Self>) -> Projection<'pin, 'a, F> {
unimplemented!()
}
}
struct Projection<'pin, 'a, F>
where
RunUntil<'a, F>: 'pin,
{
pub local_set: &'pin mut &'a LocalSet,
pub future: Pin<&'pin mut F>,
}
impl LocalSet {
fn with<T>(&self, _f: impl FnOnce() -> T) -> T {
unimplemented!()
}
}
impl<T: Future> Future for RunUntil<'_, T> {
type Output = T::Output;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let me = self.project();
me.local_set.with(|| {
let _ = cx.waker();
let f = me.future;
let _ = f.poll(cx);
Poll::Pending
})
}
}
fn main() {}

4
src/test/ui/issues/issue-73886.stderr
View File

@ -8,7 +8,9 @@ error[E0605]: non-primitive cast: `u32` as `Option<_>`
--> $DIR/issue-73886.rs:4:13
|
LL | let _ = 7u32 as Option<_>;
| ^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
| ^^^^^^^^^^^^^^^^^ help: consider using the `From` trait instead: `Option<_>::from(7u32)`
|
= note: an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
error: aborting due to 2 previous errors

14
src/tools/clippy/clippy_utils/src/ty.rs
View File

@ -15,6 +15,7 @@ use rustc_span::sym;
use rustc_span::symbol::{Ident, Symbol};
use rustc_span::DUMMY_SP;
use rustc_trait_selection::traits::query::normalize::AtExt;
use rustc_trait_selection::infer::InferCtxtExt;
use crate::{match_def_path, must_use_attr};
@ -112,6 +113,7 @@ pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<
}
/// Checks whether a type implements a trait.
/// The function returns false in case the type contains an inference variable.
/// See also `get_trait_def_id`.
pub fn implements_trait<'tcx>(
cx: &LateContext<'tcx>,
@ -119,18 +121,18 @@ pub fn implements_trait<'tcx>(
trait_id: DefId,
ty_params: &[GenericArg<'tcx>],
) -> bool {
// Do not check on infer_types to avoid panic in evaluate_obligation.
if ty.has_infer_types() {
return false;
}
// Clippy shouldn't have infer types
assert!(!ty.needs_infer());
let ty = cx.tcx.erase_regions(ty);
if ty.has_escaping_bound_vars() {
return false;
}
let ty_params = cx.tcx.mk_substs(ty_params.iter());
cx.tcx
.type_implements_trait((trait_id, ty, ty_params, cx.param_env))
cx.tcx.infer_ctxt().enter(|infcx|
infcx.type_implements_trait(trait_id, ty, ty_params, cx.param_env)
.must_apply_modulo_regions()
)
}
/// Checks whether this type implements `Drop`.