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