src/librustc_mir/transform/no_landing_pads.rs

   1 //! This pass removes the unwind branch of all the terminators when the no-landing-pads option is
   2 //! specified.
   3
   4 use rustc::ty::TyCtxt;
   5 use rustc::mir::*;
   6 use rustc::mir::visit::MutVisitor;
   7 use crate::transform::{MirPass, MirSource};
   8
   9 pub struct NoLandingPads;
  10
  11 impl MirPass for NoLandingPads {
  12     fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
  13         no_landing_pads(tcx, body)
  14     }
  15 }
  16
  17 pub fn no_landing_pads<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
  18     if tcx.sess.no_landing_pads() {
  19         NoLandingPads.visit_body(body);
  20     }
  21 }
  22
  23 impl<'tcx> MutVisitor<'tcx> for NoLandingPads {
  24     fn visit_terminator_kind(&mut self,
  25                         kind: &mut TerminatorKind<'tcx>,
  26                         location: Location) {
  27         if let Some(unwind) = kind.unwind_mut() {
  28             unwind.take();
  29         }
  30         self.super_terminator_kind(kind, location);
  31     }
  32 }