use rustc_middle::mir::traversal;
use rustc_middle::mir::visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor};
use rustc_middle::mir::{self, Location, TerminatorKind};
-use rustc_middle::ty;
use rustc_middle::ty::layout::HasTyCtxt;
use rustc_target::abi::LayoutOf;
);
}
} else {
- // FIXME this is super_place code, is repeated here to avoid cloning place or changing
- // visit_place API
- let mut context = context;
-
- if !place_ref.projection.is_empty() {
- context = if context.is_mutating_use() {
- PlaceContext::MutatingUse(MutatingUseContext::Projection)
- } else {
- PlaceContext::NonMutatingUse(NonMutatingUseContext::Projection)
- };
- }
-
self.visit_local(&place_ref.local, context, location);
- self.visit_projection(*place_ref, context, location);
}
}
}
self.visit_rvalue(rvalue, location);
}
- fn visit_terminator(&mut self, terminator: &mir::Terminator<'tcx>, location: Location) {
- let check = match terminator.kind {
- mir::TerminatorKind::Call { func: mir::Operand::Constant(ref c), ref args, .. } => {
- match *c.ty().kind() {
- ty::FnDef(did, _) => Some((did, args)),
- _ => None,
- }
- }
- _ => None,
- };
- if let Some((def_id, args)) = check {
- if Some(def_id) == self.fx.cx.tcx().lang_items().box_free_fn() {
- // box_free(x) shares with `drop x` the property that it
- // is not guaranteed to be statically dominated by the
- // definition of x, so x must always be in an alloca.
- if let mir::Operand::Move(ref place) = args[0] {
- self.visit_place(
- place,
- PlaceContext::MutatingUse(MutatingUseContext::Drop),
- location,
- );
- }
- }
- }
-
- self.super_terminator(terminator, location);
- }
-
fn visit_place(&mut self, place: &mir::Place<'tcx>, context: PlaceContext, location: Location) {
debug!("visit_place(place={:?}, context={:?})", place, context);
self.process_place(&place.as_ref(), context, location);