1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! This pass removes the unwind branch of all the terminators when the no-landing-pads option is
14 use rustc::ty::TyCtxt;
15 use rustc::mir::repr::*;
16 use rustc::mir::visit::MutVisitor;
17 use rustc::mir::transform::{Pass, MirPass, MirSource};
19 pub struct NoLandingPads;
21 impl<'tcx> MutVisitor<'tcx> for NoLandingPads {
22 fn visit_terminator(&mut self, bb: BasicBlock, terminator: &mut Terminator<'tcx>) {
23 match terminator.kind {
24 TerminatorKind::Goto { .. } |
25 TerminatorKind::Resume |
26 TerminatorKind::Return |
27 TerminatorKind::Unreachable |
28 TerminatorKind::If { .. } |
29 TerminatorKind::Switch { .. } |
30 TerminatorKind::SwitchInt { .. } => {
33 TerminatorKind::Call { cleanup: ref mut unwind, .. } |
34 TerminatorKind::Assert { cleanup: ref mut unwind, .. } |
35 TerminatorKind::DropAndReplace { ref mut unwind, .. } |
36 TerminatorKind::Drop { ref mut unwind, .. } => {
40 self.super_terminator(bb, terminator);
44 impl<'tcx> MirPass<'tcx> for NoLandingPads {
45 fn run_pass<'a>(&mut self, tcx: TyCtxt<'a, 'tcx, 'tcx>,
46 _: MirSource, mir: &mut Mir<'tcx>) {
47 if tcx.sess.no_landing_pads() {
53 impl Pass for NoLandingPads {}