mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 21:16:44 +00:00
70 lines
3.6 KiB
Plaintext
70 lines
3.6 KiB
Plaintext
LL| |#![allow(unused_assignments)]
|
|
LL| |
|
|
LL| 12|extern "C" fn might_abort(should_abort: bool) {
|
|
LL| 12| if should_abort {
|
|
LL| 0| println!("aborting...");
|
|
LL| 0| panic!("panics and aborts");
|
|
LL| 12| } else {
|
|
LL| 12| println!("Don't Panic");
|
|
LL| 12| }
|
|
LL| 12|}
|
|
LL| |
|
|
LL| |#[rustfmt::skip]
|
|
LL| 1|fn main() -> Result<(), u8> {
|
|
LL| 1| let mut countdown = 10;
|
|
LL| 11| while countdown > 0 {
|
|
LL| 10| if countdown < 5 {
|
|
LL| 4| might_abort(false);
|
|
LL| 6| }
|
|
LL| | // See discussion (below the `Notes` section) on coverage results for the closing brace.
|
|
LL| 10| if countdown < 5 { might_abort(false); } // Counts for different regions on one line.
|
|
^4 ^6
|
|
LL| | // For the following example, the closing brace is the last character on the line.
|
|
LL| | // This shows the character after the closing brace is highlighted, even if that next
|
|
LL| | // character is a newline.
|
|
LL| 10| if countdown < 5 { might_abort(false); }
|
|
^4 ^6
|
|
LL| 10| countdown -= 1;
|
|
LL| | }
|
|
LL| 1| Ok(())
|
|
LL| 1|}
|
|
LL| |
|
|
LL| |// Notes:
|
|
LL| |// 1. Compare this program and its coverage results to those of the similar tests
|
|
LL| |// `panic_unwind.rs` and `try_error_result.rs`.
|
|
LL| |// 2. This test confirms the coverage generated when a program includes `UnwindAction::Terminate`.
|
|
LL| |// 3. The test does not invoke the abort. By executing to a successful completion, the coverage
|
|
LL| |// results show where the program did and did not execute.
|
|
LL| |// 4. If the program actually aborted, the coverage counters would not be saved (which "works as
|
|
LL| |// intended"). Coverage results would show no executed coverage regions.
|
|
LL| |// 6. If `should_abort` is `true` and the program aborts, the program exits with a `132` status
|
|
LL| |// (on Linux at least).
|
|
LL| |
|
|
LL| |/*
|
|
LL| |
|
|
LL| |Expect the following coverage results:
|
|
LL| |
|
|
LL| |```text
|
|
LL| | 16| 11| while countdown > 0 {
|
|
LL| | 17| 10| if countdown < 5 {
|
|
LL| | 18| 4| might_abort(false);
|
|
LL| | 19| 6| }
|
|
LL| |```
|
|
LL| |
|
|
LL| |This is actually correct.
|
|
LL| |
|
|
LL| |The condition `countdown < 5` executed 10 times (10 loop iterations).
|
|
LL| |
|
|
LL| |It evaluated to `true` 4 times, and executed the `might_abort()` call.
|
|
LL| |
|
|
LL| |It skipped the body of the `might_abort()` call 6 times. If an `if` does not include an explicit
|
|
LL| |`else`, the coverage implementation injects a counter, at the character immediately after the `if`s
|
|
LL| |closing brace, to count the "implicit" `else`. This is the only way to capture the coverage of the
|
|
LL| |non-true condition.
|
|
LL| |
|
|
LL| |As another example of why this is important, say the condition was `countdown < 50`, which is always
|
|
LL| |`true`. In that case, we wouldn't have a test for what happens if `might_abort()` is not called.
|
|
LL| |The closing brace would have a count of `0`, highlighting the missed coverage.
|
|
LL| |*/
|
|
|