bjoernager/rust
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TypeVisitor: use ControlFlow in rustc_{mir,privacy,traits,typeck}

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This commit is contained in:
LeSeulArtichaut 2020-10-21 14:26:34 +02:00
parent 4fe735b320
commit 61f8182cec
13 changed files with 171 additions and 122 deletions
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45
compiler/rustc_mir/src/monomorphize/polymorphize.rs
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@ -20,6 +20,7 @@ use rustc_middle::ty::{
};
use rustc_span::symbol::sym;
use std::convert::TryInto;
use std::ops::ControlFlow;
/// Provide implementations of queries relating to polymorphization analysis.
pub fn provide(providers: &mut Providers) {
@ -138,7 +139,7 @@ fn mark_used_by_predicates<'tcx>(
// predicate is used.
let any_param_used = {
let mut vis = HasUsedGenericParams { unused_parameters };
predicate.visit_with(&mut vis)
predicate.visit_with(&mut vis) == ControlFlow::BREAK
};
if any_param_used {
@ -249,17 +250,17 @@ impl<'a, 'tcx> Visitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
}
impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> bool {
fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<(), ()> {
debug!("visit_const: c={:?}", c);
if !c.has_param_types_or_consts() {
return false;
return ControlFlow::CONTINUE;
}
match c.val {
ty::ConstKind::Param(param) => {
debug!("visit_const: param={:?}", param);
self.unused_parameters.clear(param.index);
false
ControlFlow::CONTINUE
}
ty::ConstKind::Unevaluated(def, _, Some(p))
// Avoid considering `T` unused when constants are of the form:
@ -270,22 +271,22 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
// the generic parameters, instead, traverse the promoted MIR.
let promoted = self.tcx.promoted_mir(def.did);
self.visit_body(&promoted[p]);
false
ControlFlow::CONTINUE
}
ty::ConstKind::Unevaluated(def, unevaluated_substs, None)
if self.tcx.def_kind(def.did) == DefKind::AnonConst =>
{
self.visit_child_body(def.did, unevaluated_substs);
false
ControlFlow::CONTINUE
}
_ => c.super_visit_with(self),
}
}
fn visit_ty(&mut self, ty: Ty<'tcx>) -> bool {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<(), ()> {
debug!("visit_ty: ty={:?}", ty);
if !ty.has_param_types_or_consts() {
return false;
return ControlFlow::CONTINUE;
}
match *ty.kind() {
@ -293,18 +294,18 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
debug!("visit_ty: def_id={:?}", def_id);
// Avoid cycle errors with generators.
if def_id == self.def_id {
return false;
return ControlFlow::CONTINUE;
}
// Consider any generic parameters used by any closures/generators as used in the
// parent.
self.visit_child_body(def_id, substs);
false
ControlFlow::CONTINUE
}
ty::Param(param) => {
debug!("visit_ty: param={:?}", param);
self.unused_parameters.clear(param.index);
false
ControlFlow::CONTINUE
}
_ => ty.super_visit_with(self),
}
@ -317,28 +318,38 @@ struct HasUsedGenericParams<'a> {
}
impl<'a, 'tcx> TypeVisitor<'tcx> for HasUsedGenericParams<'a> {
fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> bool {
fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<(), ()> {
debug!("visit_const: c={:?}", c);
if !c.has_param_types_or_consts() {
return false;
return ControlFlow::CONTINUE;
}
match c.val {
ty::ConstKind::Param(param) => {
!self.unused_parameters.contains(param.index).unwrap_or(false)
if self.unused_parameters.contains(param.index).unwrap_or(false) {
ControlFlow::CONTINUE
} else {
ControlFlow::BREAK
}
}
_ => c.super_visit_with(self),
}
}
fn visit_ty(&mut self, ty: Ty<'tcx>) -> bool {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<(), ()> {
debug!("visit_ty: ty={:?}", ty);
if !ty.has_param_types_or_consts() {
return false;
return ControlFlow::CONTINUE;
}
match ty.kind() {
ty::Param(param) => !self.unused_parameters.contains(param.index).unwrap_or(false),
ty::Param(param) => {
if self.unused_parameters.contains(param.index).unwrap_or(false) {
ControlFlow::CONTINUE
} else {
ControlFlow::BREAK
}
}
_ => ty.super_visit_with(self),
}
}