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coverage: Branch coverage tests for match arms

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Zalathar 2024-04-17 12:32:11 +10:00
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tests/coverage/branch/match-trivial.coverage Normal file
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LL| |#![feature(coverage_attribute)]
LL| |//@ edition: 2021
LL| |//@ compile-flags: -Zcoverage-options=branch
LL| |//@ llvm-cov-flags: --show-branches=count
LL| |
LL| |// When instrumenting match expressions for branch coverage, make sure we don't
LL| |// cause an ICE or produce weird coverage output for matches with <2 arms.
LL| |
LL| |// Helper macro to prevent start-of-function spans from being merged into
LL| |// spans on the lines we care about.
LL| |macro_rules! no_merge {
LL| | () => {
LL| | for _ in 0..1 {}
LL| | };
LL| |}
LL| |
LL| |enum Uninhabited {}
LL| |enum Trivial {
LL| | Value,
LL| |}
LL| |
LL| 0|fn _uninhabited(x: Uninhabited) {
LL| 0| no_merge!();
LL| |
LL| | match x {}
LL| |
LL| | consume("done");
LL| |}
LL| |
LL| 1|fn trivial(x: Trivial) {
LL| 1| no_merge!();
LL| |
LL| 1| match x {
LL| 1| Trivial::Value => consume("trivial"),
LL| 1| }
LL| 1|
LL| 1| consume("done");
LL| 1|}
LL| |
LL| |#[coverage(off)]
LL| |fn consume<T>(x: T) {
LL| | core::hint::black_box(x);
LL| |}
LL| |
LL| |#[coverage(off)]
LL| |fn main() {
LL| | trivial(Trivial::Value);
LL| |}