diff options
Diffstat (limited to '')
-rw-r--r-- | compiler/rustc_mir_transform/src/remove_storage_markers.rs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/compiler/rustc_mir_transform/src/remove_storage_markers.rs b/compiler/rustc_mir_transform/src/remove_storage_markers.rs new file mode 100644 index 000000000..dbe082e90 --- /dev/null +++ b/compiler/rustc_mir_transform/src/remove_storage_markers.rs @@ -0,0 +1,29 @@ +//! This pass removes storage markers if they won't be emitted during codegen. + +use crate::MirPass; +use rustc_middle::mir::*; +use rustc_middle::ty::TyCtxt; + +pub struct RemoveStorageMarkers; + +impl<'tcx> MirPass<'tcx> for RemoveStorageMarkers { + fn is_enabled(&self, sess: &rustc_session::Session) -> bool { + sess.mir_opt_level() > 0 + } + + fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) { + if tcx.sess.emit_lifetime_markers() { + return; + } + + trace!("Running RemoveStorageMarkers on {:?}", body.source); + for data in body.basic_blocks.as_mut_preserves_cfg() { + data.statements.retain(|statement| match statement.kind { + StatementKind::StorageLive(..) + | StatementKind::StorageDead(..) + | StatementKind::Nop => false, + _ => true, + }) + } + } +} |