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coverage: Fix an unstable-sort inconsistency in coverage spans #115930

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Merged
merged 3 commits into from
Sep 19, 2023
Merged

coverage: Fix an unstable-sort inconsistency in coverage spans #115930

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4690f97
coverage: Fix an unstable-sort inconsistency in coverage spans
Zalathar Sep 18, 2023
a4cb31b
coverage: Regression test for inconsistent handling of closure spans
Zalathar Sep 18, 2023
01b67f4
coverage: Simplify sorting of coverage spans extracted from MIR
Zalathar Sep 17, 2023
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5 changes: 4 additions & 1 deletion compiler/rustc_mir_transform/src/coverage/spans.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -333,7 +333,7 @@ impl<'a, 'tcx> CoverageSpans<'a, 'tcx> {

initial_spans.push(CoverageSpan::for_fn_sig(self.fn_sig_span));

initial_spans.sort_unstable_by(|a, b| {
initial_spans.sort_by(|a, b| {
if a.span.lo() == b.span.lo() {
if a.span.hi() == b.span.hi() {
if a.is_in_same_bcb(b) {
Expand All @@ -357,6 +357,9 @@ impl<'a, 'tcx> CoverageSpans<'a, 'tcx> {
a.span.lo().partial_cmp(&b.span.lo())
}
.unwrap()
// If two spans are otherwise identical, put closure spans first,
// as this seems to be what the refinement step expects.
.then_with(|| Ord::cmp(&a.is_closure, &b.is_closure).reverse())
});

initial_spans
Expand Down
14 changes: 7 additions & 7 deletions tests/coverage-map/status-quo/closure.cov-map
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
Function name: closure::main
Raw bytes (170): 0x[01, 01, 17, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 05, 05, 5a, 01, 05, 18, 01, 08, 01, 0f, 0d, 03, 16, 0e, 06, 0a, 07, 10, 05, 13, 0d, 0b, 1a, 0e, 08, 09, 0f, 10, 05, 0e, 09, 13, 16, 05, 0d, 18, 17, 19, 09, 01, 21, 1b, 04, 09, 00, 29, 1f, 01, 09, 00, 2d, 23, 01, 09, 00, 24, 27, 05, 09, 00, 24, 2b, 02, 09, 00, 21, 2f, 04, 09, 00, 21, 33, 04, 09, 00, 28, 37, 09, 09, 00, 32, 3b, 04, 09, 00, 33, 3f, 07, 09, 00, 4b, 43, 08, 09, 01, 09, 47, 0a, 09, 01, 09, 4b, 08, 09, 01, 09, 4f, 0a, 08, 00, 10, 05, 00, 11, 04, 06, 5a, 04, 06, 00, 07, 57, 01, 05, 03, 02]
Raw bytes (170): 0x[01, 01, 17, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 00, 01, 05, 05, 5a, 01, 05, 18, 01, 08, 01, 0f, 0d, 03, 16, 0e, 06, 0a, 07, 10, 05, 13, 0d, 0b, 1a, 0e, 06, 0a, 0f, 10, 05, 0c, 16, 13, 16, 05, 0d, 18, 17, 19, 09, 01, 1e, 1b, 04, 09, 00, 29, 1f, 01, 09, 00, 2d, 23, 01, 09, 00, 24, 27, 05, 09, 00, 24, 2b, 02, 09, 00, 21, 2f, 04, 09, 00, 21, 33, 04, 09, 00, 28, 37, 09, 09, 00, 32, 3b, 04, 09, 00, 33, 3f, 07, 09, 00, 4b, 43, 08, 09, 00, 48, 47, 0a, 09, 00, 47, 4b, 08, 09, 00, 44, 4f, 0a, 08, 00, 10, 05, 00, 11, 04, 06, 5a, 04, 06, 00, 07, 57, 01, 05, 03, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 23
Expand Down Expand Up @@ -32,13 +32,13 @@ Number of file 0 mappings: 24
= (c0 + Zero)
- Code(Expression(1, Add)) at (prev + 16, 5) to (start + 19, 13)
= (c0 + Zero)
- Code(Expression(2, Add)) at (prev + 26, 14) to (start + 8, 9)
- Code(Expression(2, Add)) at (prev + 26, 14) to (start + 6, 10)
= (c0 + Zero)
- Code(Expression(3, Add)) at (prev + 16, 5) to (start + 14, 9)
- Code(Expression(3, Add)) at (prev + 16, 5) to (start + 12, 22)
= (c0 + Zero)
- Code(Expression(4, Add)) at (prev + 22, 5) to (start + 13, 24)
= (c0 + Zero)
- Code(Expression(5, Add)) at (prev + 25, 9) to (start + 1, 33)
- Code(Expression(5, Add)) at (prev + 25, 9) to (start + 1, 30)
= (c0 + Zero)
- Code(Expression(6, Add)) at (prev + 4, 9) to (start + 0, 41)
= (c0 + Zero)
Expand All @@ -60,11 +60,11 @@ Number of file 0 mappings: 24
= (c0 + Zero)
- Code(Expression(15, Add)) at (prev + 7, 9) to (start + 0, 75)
= (c0 + Zero)
- Code(Expression(16, Add)) at (prev + 8, 9) to (start + 1, 9)
- Code(Expression(16, Add)) at (prev + 8, 9) to (start + 0, 72)
= (c0 + Zero)
- Code(Expression(17, Add)) at (prev + 10, 9) to (start + 1, 9)
- Code(Expression(17, Add)) at (prev + 10, 9) to (start + 0, 71)
= (c0 + Zero)
- Code(Expression(18, Add)) at (prev + 8, 9) to (start + 1, 9)
- Code(Expression(18, Add)) at (prev + 8, 9) to (start + 0, 68)
= (c0 + Zero)
- Code(Expression(19, Add)) at (prev + 10, 8) to (start + 0, 16)
= (c0 + Zero)
Expand Down
4 changes: 2 additions & 2 deletions tests/coverage-map/status-quo/generator.cov-map
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@ Number of file 0 mappings: 4
= (c1 + (c0 - c1))

Function name: generator::main
Raw bytes (71): 0x[01, 01, 0b, 01, 00, 05, 0b, 09, 0d, 11, 00, 11, 15, 2a, 19, 11, 15, 15, 19, 26, 00, 2a, 19, 11, 15, 09, 01, 0f, 01, 02, 19, 03, 07, 0b, 00, 2e, 11, 01, 2b, 00, 2d, 07, 01, 0e, 00, 35, 0f, 02, 0b, 00, 2e, 2a, 01, 22, 00, 27, 26, 00, 2c, 00, 2e, 1f, 01, 0e, 00, 35, 23, 02, 01, 00, 02]
Raw bytes (71): 0x[01, 01, 0b, 01, 00, 05, 0b, 09, 0d, 11, 00, 11, 15, 2a, 19, 11, 15, 15, 19, 26, 00, 2a, 19, 11, 15, 09, 01, 0f, 01, 02, 16, 03, 07, 0b, 00, 2e, 11, 01, 2b, 00, 2d, 07, 01, 0e, 00, 35, 0f, 02, 0b, 00, 2e, 2a, 01, 22, 00, 27, 26, 00, 2c, 00, 2e, 1f, 01, 0e, 00, 35, 23, 02, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 11
Expand All @@ -30,7 +30,7 @@ Number of expressions: 11
- expression 9 operands: lhs = Expression(10, Sub), rhs = Counter(6)
- expression 10 operands: lhs = Counter(4), rhs = Counter(5)
Number of file 0 mappings: 9
- Code(Counter(0)) at (prev + 15, 1) to (start + 2, 25)
- Code(Counter(0)) at (prev + 15, 1) to (start + 2, 22)
- Code(Expression(0, Add)) at (prev + 7, 11) to (start + 0, 46)
= (c0 + Zero)
- Code(Counter(4)) at (prev + 1, 43) to (start + 0, 45)
Expand Down
14 changes: 7 additions & 7 deletions tests/run-coverage/closure.coverage
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This file shows the inconsistent handling of closure spans caused by this bug.

Some closure signatures were already treated as non-executable, while others were being treated as part of the preceding code, depending on implementation details of the unstable sort.

Original file line number Diff line number Diff line change
Expand Up @@ -76,8 +76,8 @@
LL| 1| some_string = None;
LL| 1| let
LL| 1| a
LL| 1| =
LL| 1| ||
LL| | =
LL| | ||
LL| 1| {
LL| 1| let mut countdown = 0;
LL| 1| if is_false {
Expand All @@ -98,8 +98,8 @@
LL| 1|
LL| 1| let
LL| 1| quote_closure
LL| 1| =
LL| 1| |val|
LL| | =
LL| | |val|
LL| 5| {
LL| 5| let mut countdown = 0;
LL| 5| if is_false {
Expand Down Expand Up @@ -186,7 +186,7 @@
LL| | ;
LL| |
LL| 1| let short_used_not_covered_closure_line_break_block_embedded_branch =
LL| 1| | _unused_arg: u8 |
LL| | | _unused_arg: u8 |
LL| 0| {
LL| 0| println!(
LL| 0| "not called: {}",
Expand All @@ -196,7 +196,7 @@
LL| | ;
LL| |
LL| 1| let short_used_covered_closure_line_break_no_block_embedded_branch =
LL| 1| | _unused_arg: u8 |
LL| | | _unused_arg: u8 |
LL| 1| println!(
LL| 1| "not called: {}",
LL| 1| if is_true { "check" } else { "me" }
Expand All @@ -205,7 +205,7 @@
LL| | ;
LL| |
LL| 1| let short_used_covered_closure_line_break_block_embedded_branch =
LL| 1| | _unused_arg: u8 |
LL| | | _unused_arg: u8 |
LL| 1| {
LL| 1| println!(
LL| 1| "not called: {}",
Expand Down