1 1| |#![feature(c_unwind)]
2 2| |#![allow(unused_assignments)]
4 4| 12|extern "C" fn might_abort(should_abort: bool) {
5 5| 12| if should_abort {
6 6| 0| println!("aborting...");
7 7| 0| panic!("panics and aborts");
9 9| 12| println!("Don't Panic");
13 13| 1|fn main() -> Result<(), u8> {
14 14| 1| let mut countdown = 10;
15 15| 11| while countdown > 0 {
16 16| 10| if countdown < 5 {
17 17| 4| might_abort(false);
19 19| | // See discussion (below the `Notes` section) on coverage results for the closing brace.
20 20| 10| if countdown < 5 { might_abort(false); } // Counts for different regions on one line.
22 21| | // For the following example, the closing brace is the last character on the line.
23 22| | // This shows the character after the closing brace is highlighted, even if that next
24 23| | // character is a newline.
25 24| 10| if countdown < 5 { might_abort(false); }
27 25| 10| countdown -= 1;
33 31| |// 1. Compare this program and its coverage results to those of the similar tests
34 32| |// `panic_unwind.rs` and `try_error_result.rs`.
35 33| |// 2. This test confirms the coverage generated when a program includes `TerminatorKind::Abort`.
36 34| |// 3. The test does not invoke the abort. By executing to a successful completion, the coverage
37 35| |// results show where the program did and did not execute.
38 36| |// 4. If the program actually aborted, the coverage counters would not be saved (which "works as
39 37| |// intended"). Coverage results would show no executed coverage regions.
40 38| |// 6. If `should_abort` is `true` and the program aborts, the program exits with a `132` status
41 39| |// (on Linux at least).
45 43| |Expect the following coverage results:
48 46| | 16| 11| while countdown > 0 {
49 47| | 17| 10| if countdown < 5 {
50 48| | 18| 4| might_abort(false);
54 52| |This is actually correct.
56 54| |The condition `countdown < 5` executed 10 times (10 loop iterations).
58 56| |It evaluated to `true` 4 times, and executed the `might_abort()` call.
60 58| |It skipped the body of the `might_abort()` call 6 times. If an `if` does not include an explicit
61 59| |`else`, the coverage implementation injects a counter, at the character immediately after the `if`s
62 60| |closing brace, to count the "implicit" `else`. This is the only way to capture the coverage of the
63 61| |non-true condition.
65 63| |As another example of why this is important, say the condition was `countdown < 50`, which is always
66 64| |`true`. In that case, we wouldn't have a test for what happens if `might_abort()` is not called.
67 65| |The closing brace would have a count of `0`, highlighting the missed coverage.