448d63e946
For coverage tests, splitting code across multiple lines often makes the resulting coverage report easier to interpret, so we force rustfmt to retain line breaks by adding dummy line comments with `//`.
99 lines
3.7 KiB
Rust
99 lines
3.7 KiB
Rust
#![allow(unused_assignments, unused_variables)]
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// Verify that coverage works with optimizations:
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//@ compile-flags: -C opt-level=3
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use std::fmt::Debug;
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pub fn used_function() {
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// Initialize test constants in a way that cannot be determined at compile time, to ensure
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// rustc and LLVM cannot optimize out statements (or coverage counters) downstream from
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// dependent conditions.
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let is_true = std::env::args().len() == 1;
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let mut countdown = 0;
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if is_true {
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countdown = 10;
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}
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use_this_lib_crate();
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}
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pub fn used_only_from_bin_crate_generic_function<T: Debug>(arg: T) {
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println!("used_only_from_bin_crate_generic_function with {arg:?}");
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}
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// Expect for above function: `Unexecuted instantiation` (see below)
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pub fn used_only_from_this_lib_crate_generic_function<T: Debug>(arg: T) {
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println!("used_only_from_this_lib_crate_generic_function with {arg:?}");
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}
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pub fn used_from_bin_crate_and_lib_crate_generic_function<T: Debug>(arg: T) {
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println!("used_from_bin_crate_and_lib_crate_generic_function with {arg:?}");
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}
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pub fn used_with_same_type_from_bin_crate_and_lib_crate_generic_function<T: Debug>(arg: T) {
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println!("used_with_same_type_from_bin_crate_and_lib_crate_generic_function with {arg:?}");
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}
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pub fn unused_generic_function<T: Debug>(arg: T) {
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println!("unused_generic_function with {arg:?}");
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}
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pub fn unused_function() {
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let is_true = std::env::args().len() == 1;
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let mut countdown = 2;
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if !is_true {
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countdown = 20;
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}
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}
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#[allow(dead_code)]
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fn unused_private_function() {
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let is_true = std::env::args().len() == 1;
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let mut countdown = 2;
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if !is_true {
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countdown = 20;
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}
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}
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fn use_this_lib_crate() {
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used_from_bin_crate_and_lib_crate_generic_function("used from library used_crate.rs");
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used_with_same_type_from_bin_crate_and_lib_crate_generic_function(
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"used from library used_crate.rs",
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);
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let some_vec = vec![5, 6, 7, 8];
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used_only_from_this_lib_crate_generic_function(some_vec);
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used_only_from_this_lib_crate_generic_function("used ONLY from library used_crate.rs");
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}
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// FIXME(#79651): "Unexecuted instantiation" errors appear in coverage results,
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// for example:
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//
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// | Unexecuted instantiation: used_crate::used_only_from_bin_crate_generic_function::<_>
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//
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// These notices appear when `llvm-cov` shows instantiations. This may be a
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// default option, but it can be suppressed with:
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//
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// ```shell
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// $ `llvm-cov show --show-instantiations=0 ...`
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// ```
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//
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// The notice is triggered because the function is unused by the library itself,
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// so when the library is compiled, an "unused" set of mappings for that function
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// is included in the library's coverage metadata.
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//
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// Even though this function is used by `uses_crate.rs` (and
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// counted), with substitutions for `T`, those instantiations are only generated
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// when the generic function is actually used (from the binary, not from this
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// library crate). So the test result shows coverage for all instantiated
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// versions and their generic type substitutions, plus the `Unexecuted
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// instantiation` message for the non-substituted version. This is valid, but
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// unfortunately a little confusing.
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//
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// The library crate has its own coverage map, and the only way to show unused
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// coverage of a generic function is to include the generic function in the
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// coverage map, marked as an "unused function". If the library were used by
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// another binary that never used this generic function, then it would be valid
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// to show the unused generic, with unknown substitution (`_`).
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//
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// The alternative would be to exclude all generics from being included in the
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// "unused functions" list, which would then omit coverage results for
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// `unused_generic_function<T>()`.
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