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liveness: Remove unused fallthrough_ln

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This commit is contained in:
Tomasz Miąsko 2020-05-21 00:00:00 +00:00
parent b3342b4920
commit 7c6301496b
1 changed files with 1 additions and 9 deletions
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10
src/librustc_passes/liveness.rs
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@ -83,8 +83,6 @@
//!
//! - `exit_ln`: a live node that is generated to represent every 'exit' from
//! the function, whether it be by explicit return, panic, or other means.
//!
//! - `fallthrough_ln`: a live node that represents a fallthrough
use self::LiveNodeKind::*;
use self::VarKind::*;
@ -638,7 +636,6 @@ impl RWUTable {
#[derive(Copy, Clone)]
struct Specials {
exit_ln: LiveNode,
fallthrough_ln: LiveNode,
}
const ACC_READ: u32 = 1;
@ -668,7 +665,6 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
// an implicit return
let specials = Specials {
exit_ln: ir.add_live_node(ExitNode),
fallthrough_ln: ir.add_live_node(ExitNode),
};
let tables = ir.tcx.typeck_tables_of(def_id);
@ -897,12 +893,8 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
fn compute(&mut self, body: &hir::Expr<'_>) -> LiveNode {
debug!("compute: using id for body, {:?}", body);
// the fallthrough exit is only for those cases where we do not
// explicitly return:
let s = self.s;
self.init_from_succ(s.fallthrough_ln, s.exit_ln);
let entry_ln = self.propagate_through_expr(body, s.fallthrough_ln);
let entry_ln = self.propagate_through_expr(body, s.exit_ln);
// hack to skip the loop unless debug! is enabled:
debug!(