bjoernager/rust
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coverage: Extract subtracted_sum in counter creation

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This commit is contained in:
Zalathar 2024-10-16 21:25:09 +11:00
parent 3b382642ab
commit 2a3b4a0afd
2 changed files with 14 additions and 12 deletions
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16
compiler/rustc_mir_transform/src/coverage/counters.rs
View file

@ -182,6 +182,12 @@ impl CoverageCounters {
.reduce(|accum, counter| self.make_expression(accum, Op::Add, counter))
}
/// Creates a counter whose value is `lhs - SUM(rhs)`.
fn make_subtracted_sum(&mut self, lhs: BcbCounter, rhs: &[BcbCounter]) -> BcbCounter {
let Some(rhs_sum) = self.make_sum(rhs) else { return lhs };
self.make_expression(lhs, Op::Subtract, rhs_sum)
}
pub(super) fn num_counters(&self) -> usize {
self.counter_increment_sites.len()
}
@ -338,8 +344,7 @@ impl<'a> CountersBuilder<'a> {
};
// 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.
// ensure that it has a counter (existing counter/expression or a new counter).
let other_out_edge_counters = successors
.iter()
.copied()
@ -347,15 +352,10 @@ impl<'a> CountersBuilder<'a> {
.filter(|&edge_target_bcb| edge_target_bcb != target_bcb)
.map(|to_bcb| self.get_or_make_edge_counter(from_bcb, to_bcb))
.collect::<Vec<_>>();
let Some(sum_of_all_other_out_edges) = self.counters.make_sum(&other_out_edge_counters)
else {
return;
};
// 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.
let expression =
self.counters.make_expression(node_counter, Op::Subtract, sum_of_all_other_out_edges);
let expression = self.counters.make_subtracted_sum(node_counter, &other_out_edge_counters);
debug!("{target_bcb:?} gets an expression: {expression:?}");
self.counters.set_edge_counter(from_bcb, target_bcb, expression);

10
tests/coverage/branch/guard.cov-map
View file

@ -1,5 +1,5 @@
Function name: guard::branch_match_guard
Raw bytes (85): 0x[01, 01, 06, 19, 0d, 05, 09, 0f, 15, 13, 11, 17, 0d, 05, 09, 0d, 01, 0c, 01, 01, 10, 1d, 03, 0b, 00, 0c, 15, 01, 14, 02, 0a, 0d, 03, 0e, 00, 0f, 19, 00, 14, 00, 19, 20, 0d, 02, 00, 14, 00, 1e, 0d, 00, 1d, 02, 0a, 11, 03, 0e, 00, 0f, 1d, 00, 14, 00, 19, 20, 11, 09, 00, 14, 00, 1e, 11, 00, 1d, 02, 0a, 17, 03, 0e, 02, 0a, 0b, 04, 01, 00, 02]
Raw bytes (85): 0x[01, 01, 06, 19, 0d, 05, 09, 0f, 15, 13, 11, 17, 0d, 05, 09, 0d, 01, 0c, 01, 01, 10, 02, 03, 0b, 00, 0c, 15, 01, 14, 02, 0a, 0d, 03, 0e, 00, 0f, 19, 00, 14, 00, 19, 20, 0d, 02, 00, 14, 00, 1e, 0d, 00, 1d, 02, 0a, 11, 03, 0e, 00, 0f, 02, 00, 14, 00, 19, 20, 11, 09, 00, 14, 00, 1e, 11, 00, 1d, 02, 0a, 17, 03, 0e, 02, 0a, 0b, 04, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 6
@ -11,7 +11,8 @@ Number of expressions: 6
- expression 5 operands: lhs = Counter(1), rhs = Counter(2)
Number of file 0 mappings: 13
- Code(Counter(0)) at (prev + 12, 1) to (start + 1, 16)
- Code(Counter(7)) at (prev + 3, 11) to (start + 0, 12)
- Code(Expression(0, Sub)) at (prev + 3, 11) to (start + 0, 12)
= (c6 - c3)
- Code(Counter(5)) at (prev + 1, 20) to (start + 2, 10)
- Code(Counter(3)) at (prev + 3, 14) to (start + 0, 15)
- Code(Counter(6)) at (prev + 0, 20) to (start + 0, 25)
@ -20,7 +21,8 @@ Number of file 0 mappings: 13
false = (c6 - c3)
- Code(Counter(3)) at (prev + 0, 29) to (start + 2, 10)
- Code(Counter(4)) at (prev + 3, 14) to (start + 0, 15)
- Code(Counter(7)) at (prev + 0, 20) to (start + 0, 25)
- Code(Expression(0, Sub)) at (prev + 0, 20) to (start + 0, 25)
= (c6 - c3)
- Branch { true: Counter(4), false: Counter(2) } at (prev + 0, 20) to (start + 0, 30)
true = c4
false = c2
@ -29,5 +31,5 @@ Number of file 0 mappings: 13
= (c1 + c2)
- Code(Expression(2, Add)) at (prev + 4, 1) to (start + 0, 2)
= ((((c1 + c2) + c3) + c4) + c5)
Highest counter ID seen: c7
Highest counter ID seen: c6