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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