diff options
Diffstat (limited to 'tests')
| -rw-r--r-- | tests/coverage/auxiliary/discard_all_helper.rs | 6 | ||||
| -rw-r--r-- | tests/coverage/discard-all-issue-133606.coverage | 7 | ||||
| -rw-r--r-- | tests/coverage/discard-all-issue-133606.rs | 24 |
3 files changed, 37 insertions, 0 deletions
diff --git a/tests/coverage/auxiliary/discard_all_helper.rs b/tests/coverage/auxiliary/discard_all_helper.rs new file mode 100644 index 00000000000..9290bac7e53 --- /dev/null +++ b/tests/coverage/auxiliary/discard_all_helper.rs @@ -0,0 +1,6 @@ +//@ edition: 2021 + +// Force this function to be generated in its home crate, so that it ends up +// with normal coverage metadata. +#[inline(never)] +pub fn external_function() {} diff --git a/tests/coverage/discard-all-issue-133606.coverage b/tests/coverage/discard-all-issue-133606.coverage new file mode 100644 index 00000000000..8f5a32f6d70 --- /dev/null +++ b/tests/coverage/discard-all-issue-133606.coverage @@ -0,0 +1,7 @@ + LL| |//@ edition: 2021 + LL| | + LL| |// Force this function to be generated in its home crate, so that it ends up + LL| |// with normal coverage metadata. + LL| |#[inline(never)] + LL| 1|pub fn external_function() {} + diff --git a/tests/coverage/discard-all-issue-133606.rs b/tests/coverage/discard-all-issue-133606.rs new file mode 100644 index 00000000000..91c278b2bb8 --- /dev/null +++ b/tests/coverage/discard-all-issue-133606.rs @@ -0,0 +1,24 @@ +//! Regression test for <https://github.com/rust-lang/rust/issues/133606>. +//! +//! In rare cases, all of a function's coverage spans are discarded at a late +//! stage during codegen. When that happens, the subsequent code needs to take +//! special care to avoid emitting coverage metadata that would cause `llvm-cov` +//! to fail with a fatal error. +//! +//! We currently don't know of a concise way to reproduce that scenario with +//! ordinary Rust source code, so instead we set a special testing-only flag to +//! force it to occur. + +//@ edition: 2021 +//@ compile-flags: -Zcoverage-options=discard-all-spans-in-codegen + +// The `llvm-cov` tool will complain if the test binary ends up having no +// coverage metadata at all. To prevent that, we also link to instrumented +// code in an auxiliary crate that doesn't have the special flag set. + +//@ aux-build: discard_all_helper.rs +extern crate discard_all_helper; + +fn main() { + discard_all_helper::external_function(); +} |