78 lines
2.7 KiB
Plaintext
78 lines
2.7 KiB
Plaintext
LL| |#![feature(coverage_attribute)]
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LL| |//@ edition: 2021
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LL| |//@ min-llvm-version: 18
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LL| |//@ ignore-llvm-version: 19 - 99
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LL| |//@ compile-flags: -Zcoverage-options=mcdc
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LL| |//@ llvm-cov-flags: --show-branches=count --show-mcdc
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LL| |
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LL| |// Check that MC/DC instrumentation can gracefully handle conditions that
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LL| |// exceed LLVM's limit of 6 conditions per decision.
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LL| |//
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LL| |// (The limit is enforced in `compiler/rustc_mir_build/src/build/coverageinfo/mcdc.rs`.)
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LL| |
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LL| 1|fn good() {
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LL| 1| // With only 6 conditions, perform full MC/DC instrumentation.
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LL| 1| let [a, b, c, d, e, f] = <[bool; 6]>::default();
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LL| 1| if a && b && c && d && e && f {
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^0 ^0 ^0 ^0 ^0
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------------------
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| Branch (LL:8): [True: 0, False: 1]
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| Branch (LL:13): [True: 0, False: 0]
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| Branch (LL:18): [True: 0, False: 0]
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| Branch (LL:23): [True: 0, False: 0]
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| Branch (LL:28): [True: 0, False: 0]
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| Branch (LL:33): [True: 0, False: 0]
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------------------
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|---> MC/DC Decision Region (LL:8) to (LL:34)
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| Number of Conditions: 6
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| Condition C1 --> (LL:8)
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| Condition C2 --> (LL:13)
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| Condition C3 --> (LL:18)
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| Condition C4 --> (LL:23)
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| Condition C5 --> (LL:28)
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| Condition C6 --> (LL:33)
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| Executed MC/DC Test Vectors:
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| C1, C2, C3, C4, C5, C6 Result
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| 1 { F, -, -, -, -, - = F }
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| C1-Pair: not covered
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| C2-Pair: not covered
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| C3-Pair: not covered
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| C4-Pair: not covered
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| C5-Pair: not covered
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| C6-Pair: not covered
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| MC/DC Coverage for Decision: 0.00%
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------------------
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LL| 0| core::hint::black_box("hello");
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LL| 1| }
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LL| 1|}
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LL| |
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LL| 1|fn bad() {
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LL| 1| // With 7 conditions, fall back to branch instrumentation only.
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LL| 1| let [a, b, c, d, e, f, g] = <[bool; 7]>::default();
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LL| 1| if a && b && c && d && e && f && g {
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^0 ^0 ^0 ^0 ^0 ^0
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------------------
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| Branch (LL:8): [True: 0, False: 1]
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| Branch (LL:13): [True: 0, False: 0]
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| Branch (LL:18): [True: 0, False: 0]
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| Branch (LL:23): [True: 0, False: 0]
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| Branch (LL:28): [True: 0, False: 0]
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| Branch (LL:33): [True: 0, False: 0]
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| Branch (LL:38): [True: 0, False: 0]
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------------------
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LL| 0| core::hint::black_box("hello");
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LL| 1| }
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LL| 1|}
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LL| |
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LL| |#[coverage(off)]
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LL| |fn main() {
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LL| | good();
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LL| | bad();
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LL| |}
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