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coverage: Avoid overflow when the MC/DC condition limit is exceeded #125700
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| Function name: condition_limit::bad | ||
| Raw bytes (204): 0x[01, 01, 2c, 01, 05, 05, 1d, 05, 1d, 7a, 19, 05, 1d, 7a, 19, 05, 1d, 76, 15, 7a, 19, 05, 1d, 76, 15, 7a, 19, 05, 1d, 72, 11, 76, 15, 7a, 19, 05, 1d, 72, 11, 76, 15, 7a, 19, 05, 1d, 6e, 0d, 72, 11, 76, 15, 7a, 19, 05, 1d, 6e, 0d, 72, 11, 76, 15, 7a, 19, 05, 1d, 9f, 01, 02, a3, 01, 1d, a7, 01, 19, ab, 01, 15, af, 01, 11, 09, 0d, 21, 9b, 01, 9f, 01, 02, a3, 01, 1d, a7, 01, 19, ab, 01, 15, af, 01, 11, 09, 0d, 11, 01, 14, 01, 03, 09, 20, 05, 02, 03, 08, 00, 09, 05, 00, 0d, 00, 0e, 20, 7a, 1d, 00, 0d, 00, 0e, 7a, 00, 12, 00, 13, 20, 76, 19, 00, 12, 00, 13, 76, 00, 17, 00, 18, 20, 72, 15, 00, 17, 00, 18, 72, 00, 1c, 00, 1d, 20, 6e, 11, 00, 1c, 00, 1d, 6e, 00, 21, 00, 22, 20, 6a, 0d, 00, 21, 00, 22, 6a, 00, 26, 00, 27, 20, 21, 09, 00, 26, 00, 27, 21, 00, 28, 02, 06, 9b, 01, 02, 06, 00, 07, 97, 01, 01, 01, 00, 02] | ||
| Number of files: 1 | ||
| - file 0 => global file 1 | ||
| Number of expressions: 44 | ||
| - expression 0 operands: lhs = Counter(0), rhs = Counter(1) | ||
| - expression 1 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 2 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 3 operands: lhs = Expression(30, Sub), rhs = Counter(6) | ||
| - expression 4 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 5 operands: lhs = Expression(30, Sub), rhs = Counter(6) | ||
| - expression 6 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 7 operands: lhs = Expression(29, Sub), rhs = Counter(5) | ||
| - expression 8 operands: lhs = Expression(30, Sub), rhs = Counter(6) | ||
| - expression 9 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 10 operands: lhs = Expression(29, Sub), rhs = Counter(5) | ||
| - expression 11 operands: lhs = Expression(30, Sub), rhs = Counter(6) | ||
| - expression 12 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 13 operands: lhs = Expression(28, Sub), rhs = Counter(4) | ||
| - expression 14 operands: lhs = Expression(29, Sub), rhs = Counter(5) | ||
| - expression 15 operands: lhs = Expression(30, Sub), rhs = Counter(6) | ||
| - expression 16 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 17 operands: lhs = Expression(28, Sub), rhs = Counter(4) | ||
| - expression 18 operands: lhs = Expression(29, Sub), rhs = Counter(5) | ||
| - expression 19 operands: lhs = Expression(30, Sub), rhs = Counter(6) | ||
| - expression 20 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 21 operands: lhs = Expression(27, Sub), rhs = Counter(3) | ||
| - expression 22 operands: lhs = Expression(28, Sub), rhs = Counter(4) | ||
| - expression 23 operands: lhs = Expression(29, Sub), rhs = Counter(5) | ||
| - expression 24 operands: lhs = Expression(30, Sub), rhs = Counter(6) | ||
| - expression 25 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 26 operands: lhs = Expression(27, Sub), rhs = Counter(3) | ||
| - expression 27 operands: lhs = Expression(28, Sub), rhs = Counter(4) | ||
| - expression 28 operands: lhs = Expression(29, Sub), rhs = Counter(5) | ||
| - expression 29 operands: lhs = Expression(30, Sub), rhs = Counter(6) | ||
| - expression 30 operands: lhs = Counter(1), rhs = Counter(7) | ||
| - expression 31 operands: lhs = Expression(39, Add), rhs = Expression(0, Sub) | ||
| - expression 32 operands: lhs = Expression(40, Add), rhs = Counter(7) | ||
| - expression 33 operands: lhs = Expression(41, Add), rhs = Counter(6) | ||
| - expression 34 operands: lhs = Expression(42, Add), rhs = Counter(5) | ||
| - expression 35 operands: lhs = Expression(43, Add), rhs = Counter(4) | ||
| - expression 36 operands: lhs = Counter(2), rhs = Counter(3) | ||
| - expression 37 operands: lhs = Counter(8), rhs = Expression(38, Add) | ||
| - expression 38 operands: lhs = Expression(39, Add), rhs = Expression(0, Sub) | ||
| - expression 39 operands: lhs = Expression(40, Add), rhs = Counter(7) | ||
| - expression 40 operands: lhs = Expression(41, Add), rhs = Counter(6) | ||
| - expression 41 operands: lhs = Expression(42, Add), rhs = Counter(5) | ||
| - expression 42 operands: lhs = Expression(43, Add), rhs = Counter(4) | ||
| - expression 43 operands: lhs = Counter(2), rhs = Counter(3) | ||
| Number of file 0 mappings: 17 | ||
| - Code(Counter(0)) at (prev + 20, 1) to (start + 3, 9) | ||
| - Branch { true: Counter(1), false: Expression(0, Sub) } at (prev + 3, 8) to (start + 0, 9) | ||
| true = c1 | ||
| false = (c0 - c1) | ||
| - Code(Counter(1)) at (prev + 0, 13) to (start + 0, 14) | ||
| - Branch { true: Expression(30, Sub), false: Counter(7) } at (prev + 0, 13) to (start + 0, 14) | ||
| true = (c1 - c7) | ||
| false = c7 | ||
| - Code(Expression(30, Sub)) at (prev + 0, 18) to (start + 0, 19) | ||
| = (c1 - c7) | ||
| - Branch { true: Expression(29, Sub), false: Counter(6) } at (prev + 0, 18) to (start + 0, 19) | ||
| true = ((c1 - c7) - c6) | ||
| false = c6 | ||
| - Code(Expression(29, Sub)) at (prev + 0, 23) to (start + 0, 24) | ||
| = ((c1 - c7) - c6) | ||
| - Branch { true: Expression(28, Sub), false: Counter(5) } at (prev + 0, 23) to (start + 0, 24) | ||
| true = (((c1 - c7) - c6) - c5) | ||
| false = c5 | ||
| - Code(Expression(28, Sub)) at (prev + 0, 28) to (start + 0, 29) | ||
| = (((c1 - c7) - c6) - c5) | ||
| - Branch { true: Expression(27, Sub), false: Counter(4) } at (prev + 0, 28) to (start + 0, 29) | ||
| true = ((((c1 - c7) - c6) - c5) - c4) | ||
| false = c4 | ||
| - Code(Expression(27, Sub)) at (prev + 0, 33) to (start + 0, 34) | ||
| = ((((c1 - c7) - c6) - c5) - c4) | ||
| - Branch { true: Expression(26, Sub), false: Counter(3) } at (prev + 0, 33) to (start + 0, 34) | ||
| true = (((((c1 - c7) - c6) - c5) - c4) - c3) | ||
| false = c3 | ||
| - Code(Expression(26, Sub)) at (prev + 0, 38) to (start + 0, 39) | ||
| = (((((c1 - c7) - c6) - c5) - c4) - c3) | ||
| - Branch { true: Counter(8), false: Counter(2) } at (prev + 0, 38) to (start + 0, 39) | ||
| true = c8 | ||
| false = c2 | ||
| - Code(Counter(8)) at (prev + 0, 40) to (start + 2, 6) | ||
| - Code(Expression(38, Add)) at (prev + 2, 6) to (start + 0, 7) | ||
| = ((((((c2 + c3) + c4) + c5) + c6) + c7) + (c0 - c1)) | ||
| - Code(Expression(37, Add)) at (prev + 1, 1) to (start + 0, 2) | ||
| = (c8 + ((((((c2 + c3) + c4) + c5) + c6) + c7) + (c0 - c1))) | ||
|
|
||
| Function name: condition_limit::good | ||
| Raw bytes (180): 0x[01, 01, 20, 01, 05, 05, 19, 05, 19, 52, 15, 05, 19, 52, 15, 05, 19, 4e, 11, 52, 15, 05, 19, 4e, 11, 52, 15, 05, 19, 4a, 0d, 4e, 11, 52, 15, 05, 19, 4a, 0d, 4e, 11, 52, 15, 05, 19, 73, 02, 77, 19, 7b, 15, 7f, 11, 09, 0d, 1d, 6f, 73, 02, 77, 19, 7b, 15, 7f, 11, 09, 0d, 10, 01, 0c, 01, 03, 09, 28, 00, 06, 03, 08, 00, 22, 30, 05, 02, 01, 06, 00, 00, 08, 00, 09, 05, 00, 0d, 00, 0e, 30, 52, 19, 06, 05, 00, 00, 0d, 00, 0e, 52, 00, 12, 00, 13, 30, 4e, 15, 05, 04, 00, 00, 12, 00, 13, 4e, 00, 17, 00, 18, 30, 4a, 11, 04, 03, 00, 00, 17, 00, 18, 4a, 00, 1c, 00, 1d, 30, 46, 0d, 03, 02, 00, 00, 1c, 00, 1d, 46, 00, 21, 00, 22, 30, 1d, 09, 02, 00, 00, 00, 21, 00, 22, 1d, 00, 23, 02, 06, 6f, 02, 06, 00, 07, 6b, 01, 01, 00, 02] | ||
| Number of files: 1 | ||
| - file 0 => global file 1 | ||
| Number of expressions: 32 | ||
| - expression 0 operands: lhs = Counter(0), rhs = Counter(1) | ||
| - expression 1 operands: lhs = Counter(1), rhs = Counter(6) | ||
| - expression 2 operands: lhs = Counter(1), rhs = Counter(6) | ||
| - expression 3 operands: lhs = Expression(20, Sub), rhs = Counter(5) | ||
| - expression 4 operands: lhs = Counter(1), rhs = Counter(6) | ||
| - expression 5 operands: lhs = Expression(20, Sub), rhs = Counter(5) | ||
| - expression 6 operands: lhs = Counter(1), rhs = Counter(6) | ||
| - expression 7 operands: lhs = Expression(19, Sub), rhs = Counter(4) | ||
| - expression 8 operands: lhs = Expression(20, Sub), rhs = Counter(5) | ||
| - expression 9 operands: lhs = Counter(1), rhs = Counter(6) | ||
| - expression 10 operands: lhs = Expression(19, Sub), rhs = Counter(4) | ||
| - expression 11 operands: lhs = Expression(20, Sub), rhs = Counter(5) | ||
| - expression 12 operands: lhs = Counter(1), rhs = Counter(6) | ||
| - expression 13 operands: lhs = Expression(18, Sub), rhs = Counter(3) | ||
| - expression 14 operands: lhs = Expression(19, Sub), rhs = Counter(4) | ||
| - expression 15 operands: lhs = Expression(20, Sub), rhs = Counter(5) | ||
| - expression 16 operands: lhs = Counter(1), rhs = Counter(6) | ||
| - expression 17 operands: lhs = Expression(18, Sub), rhs = Counter(3) | ||
| - expression 18 operands: lhs = Expression(19, Sub), rhs = Counter(4) | ||
| - expression 19 operands: lhs = Expression(20, Sub), rhs = Counter(5) | ||
| - expression 20 operands: lhs = Counter(1), rhs = Counter(6) | ||
| - expression 21 operands: lhs = Expression(28, Add), rhs = Expression(0, Sub) | ||
| - expression 22 operands: lhs = Expression(29, Add), rhs = Counter(6) | ||
| - expression 23 operands: lhs = Expression(30, Add), rhs = Counter(5) | ||
| - expression 24 operands: lhs = Expression(31, Add), rhs = Counter(4) | ||
| - expression 25 operands: lhs = Counter(2), rhs = Counter(3) | ||
| - expression 26 operands: lhs = Counter(7), rhs = Expression(27, Add) | ||
| - expression 27 operands: lhs = Expression(28, Add), rhs = Expression(0, Sub) | ||
| - expression 28 operands: lhs = Expression(29, Add), rhs = Counter(6) | ||
| - expression 29 operands: lhs = Expression(30, Add), rhs = Counter(5) | ||
| - expression 30 operands: lhs = Expression(31, Add), rhs = Counter(4) | ||
| - expression 31 operands: lhs = Counter(2), rhs = Counter(3) | ||
| Number of file 0 mappings: 16 | ||
| - Code(Counter(0)) at (prev + 12, 1) to (start + 3, 9) | ||
| - MCDCDecision { bitmap_idx: 0, conditions_num: 6 } at (prev + 3, 8) to (start + 0, 34) | ||
| - MCDCBranch { true: Counter(1), false: Expression(0, Sub), condition_id: 1, true_next_id: 6, false_next_id: 0 } at (prev + 0, 8) to (start + 0, 9) | ||
| true = c1 | ||
| false = (c0 - c1) | ||
| - Code(Counter(1)) at (prev + 0, 13) to (start + 0, 14) | ||
| - MCDCBranch { true: Expression(20, Sub), false: Counter(6), condition_id: 6, true_next_id: 5, false_next_id: 0 } at (prev + 0, 13) to (start + 0, 14) | ||
| true = (c1 - c6) | ||
| false = c6 | ||
| - Code(Expression(20, Sub)) at (prev + 0, 18) to (start + 0, 19) | ||
| = (c1 - c6) | ||
| - MCDCBranch { true: Expression(19, Sub), false: Counter(5), condition_id: 5, true_next_id: 4, false_next_id: 0 } at (prev + 0, 18) to (start + 0, 19) | ||
| true = ((c1 - c6) - c5) | ||
| false = c5 | ||
| - Code(Expression(19, Sub)) at (prev + 0, 23) to (start + 0, 24) | ||
| = ((c1 - c6) - c5) | ||
| - MCDCBranch { true: Expression(18, Sub), false: Counter(4), condition_id: 4, true_next_id: 3, false_next_id: 0 } at (prev + 0, 23) to (start + 0, 24) | ||
| true = (((c1 - c6) - c5) - c4) | ||
| false = c4 | ||
| - Code(Expression(18, Sub)) at (prev + 0, 28) to (start + 0, 29) | ||
| = (((c1 - c6) - c5) - c4) | ||
| - MCDCBranch { true: Expression(17, Sub), false: Counter(3), condition_id: 3, true_next_id: 2, false_next_id: 0 } at (prev + 0, 28) to (start + 0, 29) | ||
| true = ((((c1 - c6) - c5) - c4) - c3) | ||
| false = c3 | ||
| - Code(Expression(17, Sub)) at (prev + 0, 33) to (start + 0, 34) | ||
| = ((((c1 - c6) - c5) - c4) - c3) | ||
| - MCDCBranch { true: Counter(7), false: Counter(2), condition_id: 2, true_next_id: 0, false_next_id: 0 } at (prev + 0, 33) to (start + 0, 34) | ||
| true = c7 | ||
| false = c2 | ||
| - Code(Counter(7)) at (prev + 0, 35) to (start + 2, 6) | ||
| - Code(Expression(27, Add)) at (prev + 2, 6) to (start + 0, 7) | ||
| = (((((c2 + c3) + c4) + c5) + c6) + (c0 - c1)) | ||
| - Code(Expression(26, Add)) at (prev + 1, 1) to (start + 0, 2) | ||
| = (c7 + (((((c2 + c3) + c4) + c5) + c6) + (c0 - c1))) | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| LL| |#![feature(coverage_attribute)] | ||
| LL| |//@ edition: 2021 | ||
| LL| |//@ min-llvm-version: 18 | ||
| LL| |//@ compile-flags: -Zcoverage-options=mcdc | ||
| LL| |//@ llvm-cov-flags: --show-branches=count --show-mcdc | ||
| LL| | | ||
| LL| |// Check that MC/DC instrumentation can gracefully handle conditions that | ||
| LL| |// exceed LLVM's limit of 6 conditions per decision. | ||
| LL| |// | ||
| LL| |// (The limit is enforced in `compiler/rustc_mir_build/src/build/coverageinfo/mcdc.rs`.) | ||
| LL| | | ||
| LL| 1|fn good() { | ||
| LL| 1| // With only 6 conditions, perform full MC/DC instrumentation. | ||
| LL| 1| let [a, b, c, d, e, f] = <[bool; 6]>::default(); | ||
| LL| 1| if a && b && c && d && e && f { | ||
| ^0 ^0 ^0 ^0 ^0 | ||
| ------------------ | ||
| | Branch (LL:8): [True: 0, False: 1] | ||
| | Branch (LL:13): [True: 0, False: 0] | ||
| | Branch (LL:18): [True: 0, False: 0] | ||
| | Branch (LL:23): [True: 0, False: 0] | ||
| | Branch (LL:28): [True: 0, False: 0] | ||
| | Branch (LL:33): [True: 0, False: 0] | ||
| ------------------ | ||
| |---> MC/DC Decision Region (LL:8) to (LL:34) | ||
| | | ||
| | Number of Conditions: 6 | ||
| | Condition C1 --> (LL:8) | ||
| | Condition C2 --> (LL:13) | ||
| | Condition C3 --> (LL:18) | ||
| | Condition C4 --> (LL:23) | ||
| | Condition C5 --> (LL:28) | ||
| | Condition C6 --> (LL:33) | ||
| | | ||
| | Executed MC/DC Test Vectors: | ||
| | | ||
| | C1, C2, C3, C4, C5, C6 Result | ||
| | 1 { F, -, -, -, -, - = F } | ||
| | | ||
| | C1-Pair: not covered | ||
| | C2-Pair: not covered | ||
| | C3-Pair: not covered | ||
| | C4-Pair: not covered | ||
| | C5-Pair: not covered | ||
| | C6-Pair: not covered | ||
| | MC/DC Coverage for Decision: 0.00% | ||
| | | ||
| ------------------ | ||
| LL| 0| core::hint::black_box("hello"); | ||
| LL| 1| } | ||
| LL| 1|} | ||
| LL| | | ||
| LL| 1|fn bad() { | ||
| LL| 1| // With 7 conditions, fall back to branch instrumentation only. | ||
| LL| 1| let [a, b, c, d, e, f, g] = <[bool; 7]>::default(); | ||
| LL| 1| if a && b && c && d && e && f && g { | ||
| ^0 ^0 ^0 ^0 ^0 ^0 | ||
| ------------------ | ||
| | Branch (LL:8): [True: 0, False: 1] | ||
| | Branch (LL:13): [True: 0, False: 0] | ||
| | Branch (LL:18): [True: 0, False: 0] | ||
| | Branch (LL:23): [True: 0, False: 0] | ||
| | Branch (LL:28): [True: 0, False: 0] | ||
| | Branch (LL:33): [True: 0, False: 0] | ||
| | Branch (LL:38): [True: 0, False: 0] | ||
| ------------------ | ||
| LL| 0| core::hint::black_box("hello"); | ||
| LL| 1| } | ||
| LL| 1|} | ||
| LL| | | ||
| LL| |#[coverage(off)] | ||
| LL| |fn main() { | ||
| LL| | good(); | ||
| LL| | bad(); | ||
| LL| |} | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| #![feature(coverage_attribute)] | ||
| //@ edition: 2021 | ||
| //@ min-llvm-version: 18 | ||
| //@ compile-flags: -Zcoverage-options=mcdc | ||
| //@ llvm-cov-flags: --show-branches=count --show-mcdc | ||
|
|
||
| // Check that MC/DC instrumentation can gracefully handle conditions that | ||
| // exceed LLVM's limit of 6 conditions per decision. | ||
| // | ||
| // (The limit is enforced in `compiler/rustc_mir_build/src/build/coverageinfo/mcdc.rs`.) | ||
|
|
||
| fn good() { | ||
| // With only 6 conditions, perform full MC/DC instrumentation. | ||
| let [a, b, c, d, e, f] = <[bool; 6]>::default(); | ||
| if a && b && c && d && e && f { | ||
| core::hint::black_box("hello"); | ||
| } | ||
| } | ||
|
|
||
| fn bad() { | ||
| // With 7 conditions, fall back to branch instrumentation only. | ||
| let [a, b, c, d, e, f, g] = <[bool; 7]>::default(); | ||
| if a && b && c && d && e && f && g { | ||
| core::hint::black_box("hello"); | ||
| } | ||
| } | ||
|
|
||
| #[coverage(off)] | ||
| fn main() { | ||
| good(); | ||
| bad(); | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| warning: Conditions number of the decision (7) exceeds limit (6). MCDC analysis will not count this expression. | ||
| --> $DIR/mcdc-condition-limit.rs:29:8 | ||
| | | ||
| LL | if a && b && c && d && e && f && g { | ||
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
|
||
| warning: 1 warning emitted | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| //@ edition: 2021 | ||
| //@ min-llvm-version: 18 | ||
| //@ revisions: good bad | ||
| //@ check-pass | ||
| //@ compile-flags: -Cinstrument-coverage -Zcoverage-options=mcdc -Zno-profiler-runtime | ||
|
|
||
| // Check that we emit some kind of diagnostic when MC/DC instrumentation sees | ||
| // code that exceeds the limit of 6 conditions per decision, and falls back | ||
| // to only instrumenting that code for branch coverage. | ||
| // | ||
| // See also `tests/coverage/mcdc/condition-limit.rs`, which tests the actual | ||
| // effect on instrumentation. | ||
| // | ||
| // (The limit is enforced in `compiler/rustc_mir_build/src/build/coverageinfo/mcdc.rs`.) | ||
|
|
||
| #[cfg(good)] | ||
| fn main() { | ||
| // 6 conditions is OK, so no diagnostic. | ||
| let [a, b, c, d, e, f] = <[bool; 6]>::default(); | ||
| if a && b && c && d && e && f { | ||
| core::hint::black_box("hello"); | ||
| } | ||
| } | ||
|
|
||
| #[cfg(bad)] | ||
| fn main() { | ||
| // 7 conditions is too many, so issue a diagnostic. | ||
| let [a, b, c, d, e, f, g] = <[bool; 7]>::default(); | ||
| if a && b && c && d && e && f && g { //[bad]~ WARNING Conditions number of the decision | ||
| core::hint::black_box("hello"); | ||
| } | ||
| } |
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