coverage: Remove debug code from the instrumentor

compiler/rustc_mir_transform/src/coverage/counters.rs

@@ -1,10 +1,8 @@
 use super::Error;
 
-use super::debug;
 use super::graph;
 use super::spans;
 
-use debug::{DebugCounters, NESTED_INDENT};
 use graph::{BasicCoverageBlock, BcbBranch, CoverageGraph, TraverseCoverageGraphWithLoops};
 use spans::CoverageSpan;
 
@@ -16,6 +14,8 @@ use rustc_middle::mir::coverage::*;
 
 use std::fmt::{self, Debug};
 
+const NESTED_INDENT: &str = "    ";
+
 /// The coverage counter or counter expression associated with a particular
 /// BCB node or BCB edge.
 #[derive(Clone)]
@@ -75,8 +75,6 @@ pub(super) struct CoverageCounters {
     /// BCB/edge, but are needed as operands to more complex expressions.
     /// These are always [`BcbCounter::Expression`].
     pub(super) intermediate_expressions: Vec<BcbCounter>,
-
-    pub debug_counters: DebugCounters,
 }
 
 impl CoverageCounters {
@@ -91,17 +89,9 @@ impl CoverageCounters {
             bcb_edge_counters: FxHashMap::default(),
             bcb_has_incoming_edge_counters: BitSet::new_empty(num_bcbs),
             intermediate_expressions: Vec::new(),
-
-            debug_counters: DebugCounters::new(),
         }
     }
 
-    /// Activate the `DebugCounters` data structures, to provide additional debug formatting
-    /// features when formatting [`BcbCounter`] (counter) values.
-    pub fn enable_debug(&mut self) {
-        self.debug_counters.enable();
-    }
-
     /// Makes [`BcbCounter`] `Counter`s and `Expressions` for the `BasicCoverageBlock`s directly or
     /// indirectly associated with `CoverageSpans`, and accumulates additional `Expression`s
     /// representing intermediate values.
@@ -113,44 +103,30 @@ impl CoverageCounters {
         MakeBcbCounters::new(self, basic_coverage_blocks).make_bcb_counters(coverage_spans)
     }
 
-    fn make_counter<F>(&mut self, debug_block_label_fn: F) -> BcbCounter
+    fn make_counter<F>(&mut self, _debug_block_label_fn: F) -> BcbCounter
     where
         F: Fn() -> Option<String>,
     {
-        let counter = BcbCounter::Counter { id: self.next_counter() };
-        if self.debug_counters.is_enabled() {
-            self.debug_counters.add_counter(&counter, (debug_block_label_fn)());
-        }
-        counter
+        let id = self.next_counter();
+        BcbCounter::Counter { id }
     }
 
     fn make_expression<F>(
         &mut self,
         lhs: Operand,
         op: Op,
         rhs: Operand,
-        debug_block_label_fn: F,
+        _debug_block_label_fn: F,
     ) -> BcbCounter
     where
         F: Fn() -> Option<String>,
     {
         let id = self.next_expression();
-        let expression = BcbCounter::Expression { id, lhs, op, rhs };
-        if self.debug_counters.is_enabled() {
-            self.debug_counters.add_counter(&expression, (debug_block_label_fn)());
-        }
-        expression
+        BcbCounter::Expression { id, lhs, op, rhs }
     }
 
     pub fn make_identity_counter(&mut self, counter_operand: Operand) -> BcbCounter {
-        let some_debug_block_label = if self.debug_counters.is_enabled() {
-            self.debug_counters.some_block_label(counter_operand).cloned()
-        } else {
-            None
-        };
-        self.make_expression(counter_operand, Op::Add, Operand::Zero, || {
-            some_debug_block_label.clone()
-        })
+        self.make_expression(counter_operand, Op::Add, Operand::Zero, || unreachable!())
     }
 
     /// Counter IDs start from one and go up.
@@ -713,6 +689,6 @@ impl<'a> MakeBcbCounters<'a> {
 
     #[inline]
     fn format_counter(&self, counter_kind: &BcbCounter) -> String {
-        self.coverage_counters.debug_counters.format_counter(counter_kind)
+        format!("{counter_kind:?}")
     }
 }