mirror of https://github.com/rust-lang/rust
23 lines
753 B
Rust
23 lines
753 B
Rust
//! 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,
|
|
})
|
|
}
|
|
}
|
|
}
|