coverage: Defer part of counter-creation until codegen

6 files changed, 108 insertions, 214 deletions

diff --git a/compiler/rustc_mir_transform/src/coverage/counters.rs b/compiler/rustc_mir_transform/src/coverage/counters.rs
index 50d5bf31829..fa4f80f827b 100644
--- a/compiler/rustc_mir_transform/src/coverage/counters.rs
+++ b/compiler/rustc_mir_transform/src/coverage/counters.rs
@@ -2,7 +2,6 @@ use std::cmp::Ordering;
 
 use either::Either;
 use itertools::Itertools;
-use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
 use rustc_data_structures::graph::DirectedGraph;
 use rustc_index::IndexVec;
@@ -11,31 +10,35 @@ use rustc_middle::mir::coverage::{CounterId, CovTerm, Expression, ExpressionId,
 
 use crate::coverage::counters::balanced_flow::BalancedFlowGraph;
 use crate::coverage::counters::node_flow::{
-    CounterTerm, NodeCounters, make_node_counters, node_flow_data_for_balanced_graph,
+    CounterTerm, NodeCounters, NodeFlowData, node_flow_data_for_balanced_graph,
 };
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph};
 
 mod balanced_flow;
-mod node_flow;
+pub(crate) mod node_flow;
 mod union_find;
 
-/// Ensures that each BCB node needing a counter has one, by creating physical
-/// counters or counter expressions for nodes as required.
-pub(super) fn make_bcb_counters(
-    graph: &CoverageGraph,
-    bcb_needs_counter: &DenseBitSet<BasicCoverageBlock>,
-) -> CoverageCounters {
+/// Struct containing the results of [`prepare_bcb_counters_data`].
+pub(crate) struct BcbCountersData {
+    pub(crate) node_flow_data: NodeFlowData<BasicCoverageBlock>,
+    pub(crate) priority_list: Vec<BasicCoverageBlock>,
+}
+
+/// Analyzes the coverage graph to create intermediate data structures that
+/// will later be used (during codegen) to create physical counters or counter
+/// expressions for each BCB node that needs one.
+pub(crate) fn prepare_bcb_counters_data(graph: &CoverageGraph) -> BcbCountersData {
     // Create the derived graphs that are necessary for subsequent steps.
     let balanced_graph = BalancedFlowGraph::for_graph(graph, |n| !graph[n].is_out_summable);
     let node_flow_data = node_flow_data_for_balanced_graph(&balanced_graph);
 
-    // Use those graphs to determine which nodes get physical counters, and how
-    // to compute the execution counts of other nodes from those counters.
+    // Also create a "priority list" of coverage graph nodes, to help determine
+    // which ones get physical counters or counter expressions. This needs to
+    // be done now, because the later parts of the counter-creation process
+    // won't have access to the original coverage graph.
     let priority_list = make_node_flow_priority_list(graph, balanced_graph);
-    let node_counters = make_node_counters(&node_flow_data, &priority_list);
 
-    // Convert the counters into a form suitable for embedding into MIR.
-    transcribe_counters(&node_counters, bcb_needs_counter)
+    BcbCountersData { node_flow_data, priority_list }
 }
 
 /// Arranges the nodes in `balanced_graph` into a list, such that earlier nodes
@@ -74,7 +77,7 @@ fn make_node_flow_priority_list(
 }
 
 // Converts node counters into a form suitable for embedding into MIR.
-fn transcribe_counters(
+pub(crate) fn transcribe_counters(
     old: &NodeCounters<BasicCoverageBlock>,
     bcb_needs_counter: &DenseBitSet<BasicCoverageBlock>,
 ) -> CoverageCounters {
@@ -129,7 +132,7 @@ fn transcribe_counters(
 pub(super) struct CoverageCounters {
     /// List of places where a counter-increment statement should be injected
     /// into MIR, each with its corresponding counter ID.
-    phys_counter_for_node: FxIndexMap<BasicCoverageBlock, CounterId>,
+    pub(crate) phys_counter_for_node: FxIndexMap<BasicCoverageBlock, CounterId>,
     next_counter_id: CounterId,
 
     /// Coverage counters/expressions that are associated with individual BCBs.
@@ -137,7 +140,7 @@ pub(super) struct CoverageCounters {
 
     /// Table of expression data, associating each expression ID with its
     /// corresponding operator (+ or -) and its LHS/RHS operands.
-    expressions: IndexVec<ExpressionId, Expression>,
+    pub(crate) expressions: IndexVec<ExpressionId, Expression>,
     /// Remember expressions that have already been created (or simplified),
     /// so that we don't create unnecessary duplicates.
     expressions_memo: FxHashMap<Expression, CovTerm>,
@@ -188,12 +191,6 @@ impl CoverageCounters {
         self.make_expression(lhs, Op::Subtract, rhs_sum)
     }
 
-    pub(super) fn num_counters(&self) -> usize {
-        let num_counters = self.phys_counter_for_node.len();
-        assert_eq!(num_counters, self.next_counter_id.as_usize());
-        num_counters
-    }
-
     fn set_node_counter(&mut self, bcb: BasicCoverageBlock, counter: CovTerm) -> CovTerm {
         let existing = self.node_counters[bcb].replace(counter);
         assert!(
@@ -202,30 +199,4 @@ impl CoverageCounters {
         );
         counter
     }
-
-    /// Returns an iterator over all the nodes in the coverage graph that
-    /// should have a counter-increment statement injected into MIR, along with
-    /// each site's corresponding counter ID.
-    pub(super) fn counter_increment_sites(
-        &self,
-    ) -> impl Iterator<Item = (CounterId, BasicCoverageBlock)> + Captures<'_> {
-        self.phys_counter_for_node.iter().map(|(&site, &id)| (id, site))
-    }
-
-    /// Returns an iterator over the subset of BCB nodes that have been associated
-    /// with a counter *expression*, along with the ID of that expression.
-    pub(super) fn bcb_nodes_with_coverage_expressions(
-        &self,
-    ) -> impl Iterator<Item = (BasicCoverageBlock, ExpressionId)> + Captures<'_> {
-        self.node_counters.iter_enumerated().filter_map(|(bcb, &counter)| match counter {
-            // Yield the BCB along with its associated expression ID.
-            Some(CovTerm::Expression(id)) => Some((bcb, id)),
-            // This BCB is associated with a counter or nothing, so skip it.
-            Some(CovTerm::Counter { .. } | CovTerm::Zero) | None => None,
-        })
-    }
-
-    pub(super) fn into_expressions(self) -> IndexVec<ExpressionId, Expression> {
-        self.expressions
-    }
 }
diff --git a/compiler/rustc_mir_transform/src/coverage/counters/node_flow.rs b/compiler/rustc_mir_transform/src/coverage/counters/node_flow.rs
index 9d80b3af42d..91ed54b8b59 100644
--- a/compiler/rustc_mir_transform/src/coverage/counters/node_flow.rs
+++ b/compiler/rustc_mir_transform/src/coverage/counters/node_flow.rs
@@ -9,6 +9,7 @@
 use rustc_data_structures::graph;
 use rustc_index::bit_set::DenseBitSet;
 use rustc_index::{Idx, IndexSlice, IndexVec};
+pub(crate) use rustc_middle::mir::coverage::NodeFlowData;
 use rustc_middle::mir::coverage::Op;
 
 use crate::coverage::counters::union_find::UnionFind;
@@ -16,30 +17,6 @@ use crate::coverage::counters::union_find::UnionFind;
 #[cfg(test)]
 mod tests;
 
-/// Data representing a view of some underlying graph, in which each node's
-/// successors have been merged into a single "supernode".
-///
-/// The resulting supernodes have no obvious meaning on their own.
-/// However, merging successor nodes means that a node's out-edges can all
-/// be combined into a single out-edge, whose flow is the same as the flow
-/// (execution count) of its corresponding node in the original graph.
-///
-/// With all node flows now in the original graph now represented as edge flows
-/// in the merged graph, it becomes possible to analyze the original node flows
-/// using techniques for analyzing edge flows.
-#[derive(Debug)]
-pub(crate) struct NodeFlowData<Node: Idx> {
-    /// Maps each node to the supernode that contains it, indicated by some
-    /// arbitrary "root" node that is part of that supernode.
-    supernodes: IndexVec<Node, Node>,
-    /// For each node, stores the single supernode that all of its successors
-    /// have been merged into.
-    ///
-    /// (Note that each node in a supernode can potentially have a _different_
-    /// successor supernode from its peers.)
-    succ_supernodes: IndexVec<Node, Node>,
-}
-
 /// Creates a "merged" view of an underlying graph.
 ///
 /// The given graph is assumed to have [“balanced flow”](balanced-flow),
diff --git a/compiler/rustc_mir_transform/src/coverage/mappings.rs b/compiler/rustc_mir_transform/src/coverage/mappings.rs
index 8d0d92dc367..d83c0d40a7e 100644
--- a/compiler/rustc_mir_transform/src/coverage/mappings.rs
+++ b/compiler/rustc_mir_transform/src/coverage/mappings.rs
@@ -1,9 +1,7 @@
 use std::collections::BTreeSet;
 
 use rustc_data_structures::fx::FxIndexMap;
-use rustc_data_structures::graph::DirectedGraph;
 use rustc_index::IndexVec;
-use rustc_index::bit_set::DenseBitSet;
 use rustc_middle::mir::coverage::{
     BlockMarkerId, BranchSpan, ConditionId, ConditionInfo, CoverageInfoHi, CoverageKind,
 };
@@ -63,10 +61,6 @@ const MCDC_MAX_BITMAP_SIZE: usize = i32::MAX as usize;
 
 #[derive(Default)]
 pub(super) struct ExtractedMappings {
-    /// Store our own copy of [`CoverageGraph::num_nodes`], so that we don't
-    /// need access to the whole graph when allocating per-BCB data. This is
-    /// only public so that other code can still use exhaustive destructuring.
-    pub(super) num_bcbs: usize,
     pub(super) code_mappings: Vec<CodeMapping>,
     pub(super) branch_pairs: Vec<BranchPair>,
     pub(super) mcdc_bitmap_bits: usize,
@@ -118,7 +112,6 @@ pub(super) fn extract_all_mapping_info_from_mir<'tcx>(
     );
 
     ExtractedMappings {
-        num_bcbs: graph.num_nodes(),
         code_mappings,
         branch_pairs,
         mcdc_bitmap_bits,
@@ -127,60 +120,6 @@ pub(super) fn extract_all_mapping_info_from_mir<'tcx>(
     }
 }
 
-impl ExtractedMappings {
-    pub(super) fn all_bcbs_with_counter_mappings(&self) -> DenseBitSet<BasicCoverageBlock> {
-        // Fully destructure self to make sure we don't miss any fields that have mappings.
-        let Self {
-            num_bcbs,
-            code_mappings,
-            branch_pairs,
-            mcdc_bitmap_bits: _,
-            mcdc_degraded_branches,
-            mcdc_mappings,
-        } = self;
-
-        // Identify which BCBs have one or more mappings.
-        let mut bcbs_with_counter_mappings = DenseBitSet::new_empty(*num_bcbs);
-        let mut insert = |bcb| {
-            bcbs_with_counter_mappings.insert(bcb);
-        };
-
-        for &CodeMapping { span: _, bcb } in code_mappings {
-            insert(bcb);
-        }
-        for &BranchPair { true_bcb, false_bcb, .. } in branch_pairs {
-            insert(true_bcb);
-            insert(false_bcb);
-        }
-        for &MCDCBranch { true_bcb, false_bcb, .. } in mcdc_degraded_branches
-            .iter()
-            .chain(mcdc_mappings.iter().map(|(_, branches)| branches.into_iter()).flatten())
-        {
-            insert(true_bcb);
-            insert(false_bcb);
-        }
-
-        // MC/DC decisions refer to BCBs, but don't require those BCBs to have counters.
-        if bcbs_with_counter_mappings.is_empty() {
-            debug_assert!(
-                mcdc_mappings.is_empty(),
-                "A function with no counter mappings shouldn't have any decisions: {mcdc_mappings:?}",
-            );
-        }
-
-        bcbs_with_counter_mappings
-    }
-
-    /// Returns the set of BCBs that have one or more `Code` mappings.
-    pub(super) fn bcbs_with_ordinary_code_mappings(&self) -> DenseBitSet<BasicCoverageBlock> {
-        let mut bcbs = DenseBitSet::new_empty(self.num_bcbs);
-        for &CodeMapping { span: _, bcb } in &self.code_mappings {
-            bcbs.insert(bcb);
-        }
-        bcbs
-    }
-}
-
 fn resolve_block_markers(
     coverage_info_hi: &CoverageInfoHi,
     mir_body: &mir::Body<'_>,
diff --git a/compiler/rustc_mir_transform/src/coverage/mod.rs b/compiler/rustc_mir_transform/src/coverage/mod.rs
index b1afcc84b6e..e195681bc92 100644
--- a/compiler/rustc_mir_transform/src/coverage/mod.rs
+++ b/compiler/rustc_mir_transform/src/coverage/mod.rs
@@ -21,7 +21,7 @@ use rustc_span::Span;
 use rustc_span::def_id::LocalDefId;
 use tracing::{debug, debug_span, trace};
 
-use crate::coverage::counters::CoverageCounters;
+use crate::coverage::counters::BcbCountersData;
 use crate::coverage::graph::CoverageGraph;
 use crate::coverage::mappings::ExtractedMappings;
 
@@ -82,29 +82,21 @@ fn instrument_function_for_coverage<'tcx>(tcx: TyCtxt<'tcx>, mir_body: &mut mir:
     let extracted_mappings =
         mappings::extract_all_mapping_info_from_mir(tcx, mir_body, &hir_info, &graph);
 
-    ////////////////////////////////////////////////////
-    // Create an optimized mix of `Counter`s and `Expression`s for the `CoverageGraph`. Ensure
-    // every coverage span has a `Counter` or `Expression` assigned to its `BasicCoverageBlock`
-    // and all `Expression` dependencies (operands) are also generated, for any other
-    // `BasicCoverageBlock`s not already associated with a coverage span.
-    let bcbs_with_counter_mappings = extracted_mappings.all_bcbs_with_counter_mappings();
-    if bcbs_with_counter_mappings.is_empty() {
-        // No relevant spans were found in MIR, so skip instrumenting this function.
-        return;
-    }
-
-    let coverage_counters = counters::make_bcb_counters(&graph, &bcbs_with_counter_mappings);
-
     let mappings = create_mappings(&extracted_mappings);
     if mappings.is_empty() {
         // No spans could be converted into valid mappings, so skip this function.
         debug!("no spans could be converted into valid mappings; skipping");
         return;
     }
-    let term_for_bcb = coverage_counters.node_counters.clone();
 
-    inject_coverage_statements(mir_body, &graph, &extracted_mappings, &coverage_counters);
+    // Use the coverage graph to prepare intermediate data that will eventually
+    // be used to assign physical counters and counter expressions to points in
+    // the control-flow graph
+    let BcbCountersData { node_flow_data, priority_list } =
+        counters::prepare_bcb_counters_data(&graph);
 
+    // Inject coverage statements into MIR.
+    inject_coverage_statements(mir_body, &graph);
     inject_mcdc_statements(mir_body, &graph, &extracted_mappings);
 
     let mcdc_num_condition_bitmaps = extracted_mappings
@@ -118,11 +110,10 @@ fn instrument_function_for_coverage<'tcx>(tcx: TyCtxt<'tcx>, mir_body: &mut mir:
         function_source_hash: hir_info.function_source_hash,
         body_span: hir_info.body_span,
 
-        num_counters: coverage_counters.num_counters(),
-        expressions: coverage_counters.into_expressions(),
+        node_flow_data,
+        priority_list,
 
         mappings,
-        term_for_bcb,
 
         mcdc_bitmap_bits: extracted_mappings.mcdc_bitmap_bits,
         mcdc_num_condition_bitmaps,
@@ -137,7 +128,6 @@ fn instrument_function_for_coverage<'tcx>(tcx: TyCtxt<'tcx>, mir_body: &mut mir:
 fn create_mappings(extracted_mappings: &ExtractedMappings) -> Vec<Mapping> {
     // Fully destructure the mappings struct to make sure we don't miss any kinds.
     let ExtractedMappings {
-        num_bcbs: _,
         code_mappings,
         branch_pairs,
         mcdc_bitmap_bits: _,
@@ -215,41 +205,11 @@ fn create_mappings(extracted_mappings: &ExtractedMappings) -> Vec<Mapping> {
     mappings
 }
 
-/// For each BCB node or BCB edge that has an associated coverage counter,
-/// inject any necessary coverage statements into MIR.
-fn inject_coverage_statements<'tcx>(
-    mir_body: &mut mir::Body<'tcx>,
-    graph: &CoverageGraph,
-    extracted_mappings: &ExtractedMappings,
-    coverage_counters: &CoverageCounters,
-) {
-    // Inject counter-increment statements into MIR.
-    for (id, bcb) in coverage_counters.counter_increment_sites() {
-        let target_bb = graph[bcb].leader_bb();
-        inject_statement(mir_body, CoverageKind::CounterIncrement { id }, target_bb);
-    }
-
-    // For each counter expression that is directly associated with at least one
-    // span, we inject an "expression-used" statement, so that coverage codegen
-    // can check whether the injected statement survived MIR optimization.
-    // (BCB edges can't have spans, so we only need to process BCB nodes here.)
-    //
-    // We only do this for ordinary `Code` mappings, because branch and MC/DC
-    // mappings might have expressions that don't correspond to any single
-    // point in the control-flow graph.
-    //
-    // See the code in `rustc_codegen_llvm::coverageinfo::map_data` that deals
-    // with "expressions seen" and "zero terms".
-    let eligible_bcbs = extracted_mappings.bcbs_with_ordinary_code_mappings();
-    for (bcb, expression_id) in coverage_counters
-        .bcb_nodes_with_coverage_expressions()
-        .filter(|&(bcb, _)| eligible_bcbs.contains(bcb))
-    {
-        inject_statement(
-            mir_body,
-            CoverageKind::ExpressionUsed { id: expression_id },
-            graph[bcb].leader_bb(),
-        );
+/// Inject any necessary coverage statements into MIR, so that they influence codegen.
+fn inject_coverage_statements<'tcx>(mir_body: &mut mir::Body<'tcx>, graph: &CoverageGraph) {
+    for (bcb, data) in graph.iter_enumerated() {
+        let target_bb = data.leader_bb();
+        inject_statement(mir_body, CoverageKind::VirtualCounter { bcb }, target_bb);
     }
 }
 
diff --git a/compiler/rustc_mir_transform/src/coverage/query.rs b/compiler/rustc_mir_transform/src/coverage/query.rs
index ef2724222ce..f362f4ccfa2 100644
--- a/compiler/rustc_mir_transform/src/coverage/query.rs
+++ b/compiler/rustc_mir_transform/src/coverage/query.rs
@@ -1,9 +1,10 @@
 use rustc_data_structures::captures::Captures;
+use rustc_index::IndexSlice;
 use rustc_index::bit_set::DenseBitSet;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use rustc_middle::mir::coverage::{
-    CounterId, CovTerm, CoverageIdsInfo, CoverageKind, Expression, ExpressionId,
-    FunctionCoverageInfo, MappingKind, Op,
+    BasicCoverageBlock, CounterId, CovTerm, CoverageIdsInfo, CoverageKind, Expression,
+    ExpressionId, MappingKind, Op,
 };
 use rustc_middle::mir::{Body, Statement, StatementKind};
 use rustc_middle::ty::{self, TyCtxt};
@@ -12,6 +13,9 @@ use rustc_span::def_id::LocalDefId;
 use rustc_span::sym;
 use tracing::trace;
 
+use crate::coverage::counters::node_flow::make_node_counters;
+use crate::coverage::counters::{CoverageCounters, transcribe_counters};
+
 /// Registers query/hook implementations related to coverage.
 pub(crate) fn provide(providers: &mut Providers) {
     providers.hooks.is_eligible_for_coverage = is_eligible_for_coverage;
@@ -89,41 +93,85 @@ fn coverage_ids_info<'tcx>(
     let mir_body = tcx.instance_mir(instance_def);
     let fn_cov_info = mir_body.function_coverage_info.as_deref()?;
 
-    let mut counters_seen = DenseBitSet::new_empty(fn_cov_info.num_counters);
-    let mut expressions_seen = DenseBitSet::new_filled(fn_cov_info.expressions.len());
+    // Scan through the final MIR to see which BCBs survived MIR opts.
+    // Any BCB not in this set was optimized away.
+    let mut bcbs_seen = DenseBitSet::new_empty(fn_cov_info.priority_list.len());
+    for kind in all_coverage_in_mir_body(mir_body) {
+        match *kind {
+            CoverageKind::VirtualCounter { bcb } => {
+                bcbs_seen.insert(bcb);
+            }
+            _ => {}
+        }
+    }
+
+    // Determine the set of BCBs that are referred to by mappings, and therefore
+    // need a counter. Any node not in this set will only get a counter if it
+    // is part of the counter expression for a node that is in the set.
+    let mut bcb_needs_counter =
+        DenseBitSet::<BasicCoverageBlock>::new_empty(fn_cov_info.priority_list.len());
+    for mapping in &fn_cov_info.mappings {
+        match mapping.kind {
+            MappingKind::Code { bcb } => {
+                bcb_needs_counter.insert(bcb);
+            }
+            MappingKind::Branch { true_bcb, false_bcb } => {
+                bcb_needs_counter.insert(true_bcb);
+                bcb_needs_counter.insert(false_bcb);
+            }
+            MappingKind::MCDCBranch { true_bcb, false_bcb, mcdc_params: _ } => {
+                bcb_needs_counter.insert(true_bcb);
+                bcb_needs_counter.insert(false_bcb);
+            }
+            MappingKind::MCDCDecision(_) => {}
+        }
+    }
+
+    let node_counters = make_node_counters(&fn_cov_info.node_flow_data, &fn_cov_info.priority_list);
+    let coverage_counters = transcribe_counters(&node_counters, &bcb_needs_counter);
+
+    let mut counters_seen = DenseBitSet::new_empty(coverage_counters.node_counters.len());
+    let mut expressions_seen = DenseBitSet::new_filled(coverage_counters.expressions.len());
 
     // For each expression ID that is directly used by one or more mappings,
     // mark it as not-yet-seen. This indicates that we expect to see a
-    // corresponding `ExpressionUsed` statement during MIR traversal.
+    // corresponding `VirtualCounter` statement during MIR traversal.
     for mapping in fn_cov_info.mappings.iter() {
         // Currently we only worry about ordinary code mappings.
         // For branch and MC/DC mappings, expressions might not correspond
         // to any particular point in the control-flow graph.
-        // (Keep this in sync with the injection of `ExpressionUsed`
-        // statements in the `InstrumentCoverage` MIR pass.)
         if let MappingKind::Code { bcb } = mapping.kind
-            && let Some(CovTerm::Expression(id)) = fn_cov_info.term_for_bcb[bcb]
+            && let Some(CovTerm::Expression(id)) = coverage_counters.node_counters[bcb]
         {
             expressions_seen.remove(id);
         }
     }
 
-    for kind in all_coverage_in_mir_body(mir_body) {
-        match *kind {
-            CoverageKind::CounterIncrement { id } => {
-                counters_seen.insert(id);
-            }
-            CoverageKind::ExpressionUsed { id } => {
-                expressions_seen.insert(id);
-            }
-            _ => {}
+    for bcb in bcbs_seen.iter() {
+        if let Some(&id) = coverage_counters.phys_counter_for_node.get(&bcb) {
+            counters_seen.insert(id);
+        }
+        if let Some(CovTerm::Expression(id)) = coverage_counters.node_counters[bcb] {
+            expressions_seen.insert(id);
         }
     }
 
-    let zero_expressions =
-        identify_zero_expressions(fn_cov_info, &counters_seen, &expressions_seen);
+    let zero_expressions = identify_zero_expressions(
+        &coverage_counters.expressions,
+        &counters_seen,
+        &expressions_seen,
+    );
 
-    Some(CoverageIdsInfo { counters_seen, zero_expressions })
+    let CoverageCounters { phys_counter_for_node, node_counters, expressions, .. } =
+        coverage_counters;
+
+    Some(CoverageIdsInfo {
+        counters_seen,
+        zero_expressions,
+        phys_counter_for_node,
+        term_for_bcb: node_counters,
+        expressions,
+    })
 }
 
 fn all_coverage_in_mir_body<'a, 'tcx>(
@@ -150,7 +198,7 @@ fn is_inlined(body: &Body<'_>, statement: &Statement<'_>) -> bool {
 /// already being performed by the Rust-side expression renumbering, so that
 /// the resulting coverage mappings don't get worse.
 fn identify_zero_expressions(
-    fn_cov_info: &FunctionCoverageInfo,
+    expressions: &IndexSlice<ExpressionId, Expression>,
     counters_seen: &DenseBitSet<CounterId>,
     expressions_seen: &DenseBitSet<ExpressionId>,
 ) -> DenseBitSet<ExpressionId> {
@@ -158,13 +206,13 @@ fn identify_zero_expressions(
     // have zero as both of their operands, and will therefore always have
     // a value of zero. Other expressions that refer to these as operands
     // can have those operands replaced with `CovTerm::Zero`.
-    let mut zero_expressions = DenseBitSet::new_empty(fn_cov_info.expressions.len());
+    let mut zero_expressions = DenseBitSet::new_empty(expressions.len());
 
     // Simplify a copy of each expression based on lower-numbered expressions,
     // and then update the set of always-zero expressions if necessary.
     // (By construction, expressions can only refer to other expressions
     // that have lower IDs, so one pass is sufficient.)
-    for (id, expression) in fn_cov_info.expressions.iter_enumerated() {
+    for (id, expression) in expressions.iter_enumerated() {
         if !expressions_seen.contains(id) {
             // If an expression was not seen, it must have been optimized away,
             // so any operand that refers to it can be replaced with zero.
diff --git a/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs b/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
index 26ce743be36..73b68d7155c 100644
--- a/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
+++ b/compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
@@ -137,8 +137,7 @@ fn filtered_statement_span(statement: &Statement<'_>) -> Option<Span> {
 
         // These coverage statements should not exist prior to coverage instrumentation.
         StatementKind::Coverage(
-            CoverageKind::CounterIncrement { .. }
-            | CoverageKind::ExpressionUsed { .. }
+            CoverageKind::VirtualCounter { .. }
             | CoverageKind::CondBitmapUpdate { .. }
             | CoverageKind::TestVectorBitmapUpdate { .. },
         ) => bug!(