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Use TypeVisitor::BreakTy in HasTypeFlagsVisitor

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This commit is contained in:
LeSeulArtichaut 2020-11-05 19:30:42 +01:00
parent 23feec3977
commit 29b140a1c3
1 changed files with 22 additions and 5 deletions
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27
compiler/rustc_middle/src/ty/fold.rs
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@ -73,7 +73,7 @@ pub trait TypeFoldable<'tcx>: fmt::Debug + Clone {
}
fn has_type_flags(&self, flags: TypeFlags) -> bool {
self.visit_with(&mut HasTypeFlagsVisitor { flags }).is_break()
self.visit_with(&mut HasTypeFlagsVisitor { flags }).break_value() == Some(FoundFlags)
}
fn has_projections(&self) -> bool {
self.has_type_flags(TypeFlags::HAS_PROJECTION)
@ -901,12 +901,17 @@ impl<'tcx> TypeVisitor<'tcx> for HasEscapingVarsVisitor {
}
}
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
struct FoundFlags;
// FIXME: Optimize for checking for infer flags
struct HasTypeFlagsVisitor {
flags: ty::TypeFlags,
}
impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
type BreakTy = FoundFlags;
fn visit_ty(&mut self, t: Ty<'_>) -> ControlFlow<Self::BreakTy> {
debug!(
"HasTypeFlagsVisitor: t={:?} t.flags={:?} self.flags={:?}",
@ -914,19 +919,31 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
t.flags(),
self.flags
);
if t.flags().intersects(self.flags) { ControlFlow::BREAK } else { ControlFlow::CONTINUE }
if t.flags().intersects(self.flags) {
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
let flags = r.type_flags();
debug!("HasTypeFlagsVisitor: r={:?} r.flags={:?} self.flags={:?}", r, flags, self.flags);
if flags.intersects(self.flags) { ControlFlow::BREAK } else { ControlFlow::CONTINUE }
if flags.intersects(self.flags) {
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}
}
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
let flags = FlagComputation::for_const(c);
debug!("HasTypeFlagsVisitor: c={:?} c.flags={:?} self.flags={:?}", c, flags, self.flags);
if flags.intersects(self.flags) { ControlFlow::BREAK } else { ControlFlow::CONTINUE }
if flags.intersects(self.flags) {
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}
}
fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
@ -935,7 +952,7 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
predicate, predicate.inner.flags, self.flags
);
if predicate.inner.flags.intersects(self.flags) {
ControlFlow::BREAK
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}