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