bjoernager/rust
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use ty::Unevaluated<'tcx, ()> in type system

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This commit is contained in:
b-naber 2022-06-27 16:32:47 +02:00
parent 7098c181f8
commit a4bbb8db5c
32 changed files with 304 additions and 192 deletions
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17
compiler/rustc_monomorphize/src/collector.rs
View file

@ -767,7 +767,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirNeighborCollector<'a, 'tcx> {
ty::ConstKind::Unevaluated(ct) => {
debug!(?ct);
let param_env = ty::ParamEnv::reveal_all();
match self.tcx.const_eval_resolve(param_env, ct, None) {
match self.tcx.const_eval_resolve(param_env, ct.expand(), None) {
// The `monomorphize` call should have evaluated that constant already.
Ok(val) => val,
Err(ErrorHandled::Reported(_) | ErrorHandled::Linted) => return,
@ -780,6 +780,19 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirNeighborCollector<'a, 'tcx> {
}
_ => return,
},
mir::ConstantKind::Unevaluated(uv, _) => {
let param_env = ty::ParamEnv::reveal_all();
match self.tcx.const_eval_resolve(param_env, uv, None) {
// The `monomorphize` call should have evaluated that constant already.
Ok(val) => val,
Err(ErrorHandled::Reported(_) | ErrorHandled::Linted) => return,
Err(ErrorHandled::TooGeneric) => span_bug!(
self.body.source_info(location).span,
"collection encountered polymorphic constant: {:?}",
literal
),
}
}
};
collect_const_value(self.tcx, val, self.output);
self.visit_ty(literal.ty(), TyContext::Location(location));
@ -798,7 +811,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirNeighborCollector<'a, 'tcx> {
collect_const_value(self.tcx, const_val, self.output)
}
ty::ConstKind::Unevaluated(unevaluated) => {
match self.tcx.const_eval_resolve(param_env, unevaluated, None) {
match self.tcx.const_eval_resolve(param_env, unevaluated.expand(), None) {
// The `monomorphize` call should have evaluated that constant already.
Ok(val) => span_bug!(
self.body.source_info(location).span,

34
compiler/rustc_monomorphize/src/polymorphize.rs
View file

@ -9,7 +9,7 @@ use rustc_hir::{def::DefKind, def_id::DefId, ConstContext};
use rustc_index::bit_set::FiniteBitSet;
use rustc_middle::mir::{
visit::{TyContext, Visitor},
Local, LocalDecl, Location,
ConstantKind, Local, LocalDecl, Location,
};
use rustc_middle::ty::{
self,
@ -292,7 +292,29 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
self.unused_parameters.clear(param.index);
ControlFlow::CONTINUE
}
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs: _, promoted: Some(p)})
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted })
if matches!(
self.tcx.def_kind(def.did),
DefKind::AnonConst | DefKind::InlineConst
) =>
{
assert_eq!(promoted, ());
self.visit_child_body(def.did, substs);
ControlFlow::CONTINUE
}
_ => c.super_visit_with(self),
}
}
fn visit_mir_const(&mut self, constant: ConstantKind<'tcx>) -> ControlFlow<Self::BreakTy> {
if !constant.has_param_types_or_consts() {
return ControlFlow::CONTINUE;
}
match constant {
ConstantKind::Ty(_) => constant.super_visit_with(self),
ConstantKind::Unevaluated(ty::Unevaluated { def, substs: _, promoted: Some(p) }, _)
// Avoid considering `T` unused when constants are of the form:
// `<Self as Foo<T>>::foo::promoted[p]`
if self.def_id == def.did && !self.tcx.generics_of(def.did).has_self =>
@ -303,13 +325,9 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
self.visit_body(&promoted[p]);
ControlFlow::CONTINUE
}
ty::ConstKind::Unevaluated(uv)
if matches!(self.tcx.def_kind(uv.def.did), DefKind::AnonConst | DefKind::InlineConst) =>
{
self.visit_child_body(uv.def.did, uv.substs);
ControlFlow::CONTINUE
ConstantKind::Val(..) | ConstantKind::Unevaluated(..) => {
constant.super_visit_with(self)
}
_ => c.super_visit_with(self),
}
}