Visit only terminators when removing landing pads

No functional changes intended

compiler/rustc_mir/src/shim.rs

@@ -81,7 +81,7 @@ fn make_shim<'tcx>(tcx: TyCtxt<'tcx>, instance: ty::InstanceDef<'tcx>) -> Body<'
  MirPhase::Const,
  &[&[
  &add_moves_for_packed_drops::AddMovesForPackedDrops,
- &no_landing_pads::NoLandingPads::new(tcx),
+ &no_landing_pads::NoLandingPads,
  &remove_noop_landing_pads::RemoveNoopLandingPads,
  &simplify::SimplifyCfg::new("make_shim"),
  &add_call_guards::CriticalCallEdges,

compiler/rustc_mir/src/transform/mod.rs

@@ -433,15 +433,15 @@ fn run_post_borrowck_cleanup_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tc
 
  let post_borrowck_cleanup: &[&dyn MirPass<'tcx>] = &[
  // Remove all things only needed by analysis
- &no_landing_pads::NoLandingPads::new(tcx),
+ &no_landing_pads::NoLandingPads,
  &simplify_branches::SimplifyBranches::new("initial"),
  &remove_noop_landing_pads::RemoveNoopLandingPads,
  &cleanup_post_borrowck::CleanupNonCodegenStatements,
  &simplify::SimplifyCfg::new("early-opt"),
  // These next passes must be executed together
  &add_call_guards::CriticalCallEdges,
  &elaborate_drops::ElaborateDrops,
- &no_landing_pads::NoLandingPads::new(tcx),
+ &no_landing_pads::NoLandingPads,
  // AddMovesForPackedDrops needs to run after drop
  // elaboration.
  &add_moves_for_packed_drops::AddMovesForPackedDrops,

compiler/rustc_mir/src/transform/no_landing_pads.rs

@@ -2,42 +2,27 @@
 //! specified.
 
 use crate::transform::MirPass;
-use rustc_middle::mir::visit::MutVisitor;
 use rustc_middle::mir::*;
 use rustc_middle::ty::TyCtxt;
 use rustc_target::spec::PanicStrategy;
 
-pub struct NoLandingPads<'tcx> {
- tcx: TyCtxt<'tcx>,
-}
-
-impl<'tcx> NoLandingPads<'tcx> {
- pub fn new(tcx: TyCtxt<'tcx>) -> Self {
- NoLandingPads { tcx }
- }
-}
+pub struct NoLandingPads;
 
-impl<'tcx> MirPass<'tcx> for NoLandingPads<'tcx> {
+impl<'tcx> MirPass<'tcx> for NoLandingPads {
  fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
  no_landing_pads(tcx, body)
  }
 }
 
 pub fn no_landing_pads<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
- if tcx.sess.panic_strategy() == PanicStrategy::Abort {
- NoLandingPads::new(tcx).visit_body(body);
- }
-}
-
-impl<'tcx> MutVisitor<'tcx> for NoLandingPads<'tcx> {
- fn tcx(&self) -> TyCtxt<'tcx> {
- self.tcx
+ if tcx.sess.panic_strategy() != PanicStrategy::Abort {
+ return;
  }
 
- fn visit_terminator(&mut self, terminator: &mut Terminator<'tcx>, location: Location) {
+ for block in body.basic_blocks_mut() {
+ let terminator = block.terminator_mut();
  if let Some(unwind) = terminator.kind.unwind_mut() {
  unwind.take();
  }
- self.super_terminator(terminator, location);
  }
 }