rust/compiler/rustc_mir_transform/src/remove_false_edges.rs

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use rustc_middle::mir::{Body, TerminatorKind};
use rustc_middle::ty::TyCtxt;
use crate::MirPass;
/// Removes `FalseEdge` and `FalseUnwind` terminators from the MIR.
///
/// These are only needed for borrow checking, and can be removed afterwards.
///
/// FIXME: This should probably have its own MIR phase.
pub struct RemoveFalseEdges;
impl<'tcx> MirPass<'tcx> for RemoveFalseEdges {
fn run_pass(&self, _: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
for block in body.basic_blocks_mut() {
let terminator = block.terminator_mut();
terminator.kind = match terminator.kind {
TerminatorKind::FalseEdge { real_target, .. } => {
TerminatorKind::Goto { target: real_target }
}
TerminatorKind::FalseUnwind { real_target, .. } => {
TerminatorKind::Goto { target: real_target }
}
_ => continue,
}
}
}
}