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Diffstat (limited to 'tests/run-coverage/abort.coverage')
-rw-r--r-- | tests/run-coverage/abort.coverage | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/tests/run-coverage/abort.coverage b/tests/run-coverage/abort.coverage new file mode 100644 index 000000000..a71c58d61 --- /dev/null +++ b/tests/run-coverage/abort.coverage @@ -0,0 +1,69 @@ + 1| |#![feature(c_unwind)] + 2| |#![allow(unused_assignments)] + 3| | + 4| 12|extern "C" fn might_abort(should_abort: bool) { + 5| 12| if should_abort { + 6| 0| println!("aborting..."); + 7| 0| panic!("panics and aborts"); + 8| 12| } else { + 9| 12| println!("Don't Panic"); + 10| 12| } + 11| 12|} + 12| | + 13| 1|fn main() -> Result<(), u8> { + 14| 1| let mut countdown = 10; + 15| 11| while countdown > 0 { + 16| 10| if countdown < 5 { + 17| 4| might_abort(false); + 18| 6| } + 19| | // See discussion (below the `Notes` section) on coverage results for the closing brace. + 20| 10| if countdown < 5 { might_abort(false); } // Counts for different regions on one line. + ^4 ^6 + 21| | // For the following example, the closing brace is the last character on the line. + 22| | // This shows the character after the closing brace is highlighted, even if that next + 23| | // character is a newline. + 24| 10| if countdown < 5 { might_abort(false); } + ^4 ^6 + 25| 10| countdown -= 1; + 26| | } + 27| 1| Ok(()) + 28| 1|} + 29| | + 30| |// Notes: + 31| |// 1. Compare this program and its coverage results to those of the similar tests + 32| |// `panic_unwind.rs` and `try_error_result.rs`. + 33| |// 2. This test confirms the coverage generated when a program includes `UnwindAction::Terminate`. + 34| |// 3. The test does not invoke the abort. By executing to a successful completion, the coverage + 35| |// results show where the program did and did not execute. + 36| |// 4. If the program actually aborted, the coverage counters would not be saved (which "works as + 37| |// intended"). Coverage results would show no executed coverage regions. + 38| |// 6. If `should_abort` is `true` and the program aborts, the program exits with a `132` status + 39| |// (on Linux at least). + 40| | + 41| |/* + 42| | + 43| |Expect the following coverage results: + 44| | + 45| |```text + 46| | 16| 11| while countdown > 0 { + 47| | 17| 10| if countdown < 5 { + 48| | 18| 4| might_abort(false); + 49| | 19| 6| } + 50| |``` + 51| | + 52| |This is actually correct. + 53| | + 54| |The condition `countdown < 5` executed 10 times (10 loop iterations). + 55| | + 56| |It evaluated to `true` 4 times, and executed the `might_abort()` call. + 57| | + 58| |It skipped the body of the `might_abort()` call 6 times. If an `if` does not include an explicit + 59| |`else`, the coverage implementation injects a counter, at the character immediately after the `if`s + 60| |closing brace, to count the "implicit" `else`. This is the only way to capture the coverage of the + 61| |non-true condition. + 62| | + 63| |As another example of why this is important, say the condition was `countdown < 50`, which is always + 64| |`true`. In that case, we wouldn't have a test for what happens if `might_abort()` is not called. + 65| |The closing brace would have a count of `0`, highlighting the missed coverage. + 66| |*/ + |