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coverage: Separate creation of edge counters from building their sum

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Zalathar 2024-09-11 17:16:14 +10:00
parent 6c65d4f47f
commit a7a3595668
1 changed files with 26 additions and 28 deletions
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54
compiler/rustc_mir_transform/src/coverage/counters.rs
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@ -315,20 +315,20 @@ fn make_node_counter_and_out_edge_counters(
// For each out-edge other than the one that was chosen to get an expression,
// ensure that it has a counter (existing counter/expression or a new counter),
// and accumulate the corresponding counters into a single sum expression.
let sum_of_all_other_out_edges: BcbCounter = {
let _span = debug_span!("sum_of_all_other_out_edges", ?expression_to_bcb).entered();
successors
.iter()
.copied()
// Skip the chosen edge, since we'll calculate its count from this sum.
.filter(|&to_bcb| to_bcb != expression_to_bcb)
.fold(None, |accum, to_bcb| {
let _span = debug_span!("to_bcb", ?accum, ?to_bcb).entered();
let edge_counter = self.get_or_make_edge_counter(from_bcb, to_bcb);
Some(self.coverage_counters.make_sum_expression(accum, edge_counter))
})
.expect("there must be at least one other out-edge")
};
let other_out_edge_counters = successors
.iter()
.copied()
// Skip the chosen edge, since we'll calculate its count from this sum.
.filter(|&to_bcb| to_bcb != expression_to_bcb)
.map(|to_bcb| self.get_or_make_edge_counter(from_bcb, to_bcb))
.collect::<Vec<_>>();
let sum_of_all_other_out_edges: BcbCounter = other_out_edge_counters
.iter()
.copied()
.fold(None, |accum, edge_counter| {
Some(self.coverage_counters.make_sum_expression(accum, edge_counter))
})
.expect("there must be at least one other out-edge");
// Now create an expression for the chosen edge, by taking the counter
// for its source node and subtracting the sum of its sibling out-edges.
@ -375,20 +375,18 @@ fn get_or_make_node_counter(&mut self, bcb: BasicCoverageBlock) -> BcbCounter {
// A BCB with multiple incoming edges can compute its count by ensuring that counters
// exist for each of those edges, and then adding them up to get a total count.
let sum_of_in_edges: BcbCounter = {
let _span = debug_span!("sum_of_in_edges", ?bcb).entered();
// We avoid calling `self.bcb_predecessors` here so that we can
// call methods on `&mut self` inside the fold.
self.basic_coverage_blocks.predecessors[bcb]
.iter()
.copied()
.fold(None, |accum, from_bcb| {
let _span = debug_span!("from_bcb", ?accum, ?from_bcb).entered();
let edge_counter = self.get_or_make_edge_counter(from_bcb, bcb);
Some(self.coverage_counters.make_sum_expression(accum, edge_counter))
})
.expect("there must be at least one in-edge")
};
let in_edge_counters = self.basic_coverage_blocks.predecessors[bcb]
.iter()
.copied()
.map(|from_bcb| self.get_or_make_edge_counter(from_bcb, bcb))
.collect::<Vec<_>>();
let sum_of_in_edges: BcbCounter = in_edge_counters
.iter()
.copied()
.fold(None, |accum, edge_counter| {
Some(self.coverage_counters.make_sum_expression(accum, edge_counter))
})
.expect("there must be at least one in-edge");
debug!("{bcb:?} gets a new counter (sum of predecessor counters): {sum_of_in_edges:?}");
self.coverage_counters.set_bcb_counter(bcb, sum_of_in_edges)