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coverage: Eagerly deduplicate covspans with the same span

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This commit is contained in:
Zalathar 2024-02-18 20:38:07 +11:00
parent 7168c13579
commit ec91209f96
3 changed files with 18 additions and 15 deletions
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15
compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
View file

@ -52,14 +52,19 @@ pub(super) fn mir_to_initial_sorted_coverage_spans(
// - Span A extends further left, or
// - Both have the same start and span A extends further right
.then_with(|| Ord::cmp(&a.span.hi(), &b.span.hi()).reverse())
// If both spans are equal, sort the BCBs in dominator order,
// so that dominating BCBs come before other BCBs they dominate.
.then_with(|| basic_coverage_blocks.cmp_in_dominator_order(a.bcb, b.bcb))
// If two spans are otherwise identical, put closure spans first,
// as this seems to be what the refinement step expects.
// If two spans have the same lo & hi, put closure spans first,
// as they take precedence over non-closure spans.
.then_with(|| Ord::cmp(&a.is_closure, &b.is_closure).reverse())
// After deduplication, we want to keep only the most-dominated BCB.
.then_with(|| basic_coverage_blocks.cmp_in_dominator_order(a.bcb, b.bcb).reverse())
});
// Among covspans with the same span, keep only one. Closure spans take
// precedence, otherwise keep the one with the most-dominated BCB.
// (Ideally we should try to preserve _all_ non-dominating BCBs, but that
// requires a lot more complexity in the span refiner, for little benefit.)
initial_spans.dedup_by(|b, a| a.span.source_equal(b.span));
initial_spans
}

9
tests/coverage/closure_macro.cov-map
View file

@ -7,18 +7,17 @@ Number of file 0 mappings: 1
- Code(Counter(0)) at (prev + 29, 1) to (start + 2, 2)
Function name: closure_macro::main
Raw bytes (43): 0x[01, 01, 02, 01, 05, 05, 02, 07, 01, 21, 01, 01, 21, 02, 02, 09, 00, 0f, 05, 00, 12, 00, 13, 02, 00, 12, 00, 13, 05, 00, 54, 00, 55, 02, 02, 09, 02, 0b, 07, 03, 01, 00, 02]
Raw bytes (38): 0x[01, 01, 02, 01, 05, 05, 02, 06, 01, 21, 01, 01, 21, 02, 02, 09, 00, 12, 02, 00, 0f, 00, 54, 05, 00, 54, 00, 55, 02, 02, 09, 02, 0b, 07, 03, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 2
- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
- expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
Number of file 0 mappings: 7
Number of file 0 mappings: 6
- Code(Counter(0)) at (prev + 33, 1) to (start + 1, 33)
- Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 0, 15)
- Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 0, 18)
= (c0 - c1)
- Code(Counter(1)) at (prev + 0, 18) to (start + 0, 19)
- Code(Expression(0, Sub)) at (prev + 0, 18) to (start + 0, 19)
- Code(Expression(0, Sub)) at (prev + 0, 15) to (start + 0, 84)
= (c0 - c1)
- Code(Counter(1)) at (prev + 0, 84) to (start + 0, 85)
- Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 2, 11)

9
tests/coverage/closure_macro_async.cov-map
View file

@ -15,18 +15,17 @@ Number of file 0 mappings: 1
- Code(Counter(0)) at (prev + 35, 1) to (start + 0, 43)
Function name: closure_macro_async::test::{closure#0}
Raw bytes (43): 0x[01, 01, 02, 01, 05, 05, 02, 07, 01, 23, 2b, 01, 21, 02, 02, 09, 00, 0f, 05, 00, 12, 00, 13, 02, 00, 12, 00, 13, 05, 00, 54, 00, 55, 02, 02, 09, 02, 0b, 07, 03, 01, 00, 02]
Raw bytes (38): 0x[01, 01, 02, 01, 05, 05, 02, 06, 01, 23, 2b, 01, 21, 02, 02, 09, 00, 12, 02, 00, 0f, 00, 54, 05, 00, 54, 00, 55, 02, 02, 09, 02, 0b, 07, 03, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 2
- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
- expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
Number of file 0 mappings: 7
Number of file 0 mappings: 6
- Code(Counter(0)) at (prev + 35, 43) to (start + 1, 33)
- Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 0, 15)
- Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 0, 18)
= (c0 - c1)
- Code(Counter(1)) at (prev + 0, 18) to (start + 0, 19)
- Code(Expression(0, Sub)) at (prev + 0, 18) to (start + 0, 19)
- Code(Expression(0, Sub)) at (prev + 0, 15) to (start + 0, 84)
= (c0 - c1)
- Code(Counter(1)) at (prev + 0, 84) to (start + 0, 85)
- Code(Expression(0, Sub)) at (prev + 2, 9) to (start + 2, 11)