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//! This pass removes `PlaceMention` statement, which has no effect at codegen.
use rustc_middle::mir::*;
use rustc_middle::ty::TyCtxt;
pub struct RemovePlaceMention;
impl<'tcx> MirPass<'tcx> for RemovePlaceMention {
fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
!sess.opts.unstable_opts.mir_keep_place_mention
}
fn run_pass(&self, _: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
trace!("Running RemovePlaceMention on {:?}", body.source);
for data in body.basic_blocks.as_mut_preserves_cfg() {
data.statements.retain(|statement| match statement.kind {
StatementKind::PlaceMention(..) | StatementKind::Nop => false,
_ => true,
})
}
}
}
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