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)))

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| |}

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");

}

fn main() {

good();

bad();

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

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");

}

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");

}