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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| |// Tests for branch coverage of various kinds of match 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| |#[derive(Clone, Copy, Debug)]
LL| |enum Enum {
LL| | A(u32),
LL| | B(u32),
LL| | C(u32),
LL| | D(u32),
LL| |}
LL| |
LL| 15|fn match_arms(value: Enum) {
LL| 15| no_merge!();
LL| |
LL| 15| match value {
LL| 8| Enum::D(d) => consume(d),
LL| 4| Enum::C(c) => consume(c),
LL| 2| Enum::B(b) => consume(b),
LL| 1| Enum::A(a) => consume(a),
LL| | }
LL| |
LL| 15| consume(0);
LL| 15|}
LL| |
LL| 15|fn or_patterns(value: Enum) {
LL| 15| no_merge!();
LL| |
LL| 15| match value {
LL| 12| Enum::D(x) | Enum::C(x) => consume(x),
^8 ^4
LL| 3| Enum::B(y) | Enum::A(y) => consume(y),
^2 ^1
LL| | }
LL| |
LL| 15| consume(0);
LL| 15|}
LL| |
LL| 45|fn guards(value: Enum, cond: bool) {
LL| 45| no_merge!();
LL| |
LL| 3| match value {
LL| 8| Enum::D(d) if cond => consume(d),
------------------
| Branch (LL:23): [True: 8, False: 16]
------------------
LL| 4| Enum::C(c) if cond => consume(c),
------------------
| Branch (LL:23): [True: 4, False: 8]
------------------
LL| 2| Enum::B(b) if cond => consume(b),
------------------
| Branch (LL:23): [True: 2, False: 4]
------------------
LL| 1| Enum::A(a) if cond => consume(a),
------------------
| Branch (LL:23): [True: 1, False: 2]
------------------
LL| 30| _ => consume(0),
LL| | }
LL| |
LL| 45| consume(0);
LL| 45|}
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| | #[coverage(off)]
LL| | fn call_everything(e: Enum) {
LL| | match_arms(e);
LL| | or_patterns(e);
LL| | for cond in [false, false, true] {
LL| | guards(e, cond);
LL| | }
LL| | }
LL| |
LL| | call_everything(Enum::A(0));
LL| | for b in 0..2 {
LL| | call_everything(Enum::B(b));
LL| | }
LL| | for c in 0..4 {
LL| | call_everything(Enum::C(c));
LL| | }
LL| | for d in 0..8 {
LL| | call_everything(Enum::D(d));
LL| | }
LL| |}
LL| |
LL| |// FIXME(#124118) Actually instrument match arms for branch coverage.
|
