Import 'cov-mark' crate
Request Document: go/android-rust-importing-crates
For CL Reviewers: go/android3p#cl-review
For Build Team: go/ab-third-party-imports
Bug: 364711528
Test: m libcov_mark
Change-Id: I1c0be9d88fd5fd02600029e211201d9c99059aa6
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..0273301
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,6 @@
+{
+ "git": {
+ "sha1": "930df736cc6cd5b5ce449b3d8ef81220a29e2e6c"
+ },
+ "path_in_vcs": ""
+}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7adcbec
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/target
+/ci
+Cargo.lock
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..afad5fa
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,54 @@
+// This file is generated by cargo_embargo.
+// Do not modify this file because the changes will be overridden on upgrade.
+
+package {
+ default_applicable_licenses: ["external_rust_crates_cov-mark_license"],
+ default_team: "trendy_team_android_rust",
+}
+
+license {
+ name: "external_rust_crates_cov-mark_license",
+ visibility: [":__subpackages__"],
+ license_kinds: ["SPDX-license-identifier-Apache-2.0"],
+ license_text: ["LICENSE"],
+}
+
+rust_test {
+ name: "cov-mark_test_tests_smoke",
+ host_supported: true,
+ crate_name: "smoke",
+ cargo_env_compat: true,
+ cargo_pkg_version: "2.0.0",
+ crate_root: "tests/smoke.rs",
+ test_suites: ["general-tests"],
+ auto_gen_config: true,
+ test_options: {
+ unit_test: true,
+ },
+ edition: "2021",
+ features: [
+ "default",
+ "enable",
+ ],
+ rustlibs: ["libcov_mark"],
+}
+
+rust_library {
+ name: "libcov_mark",
+ host_supported: true,
+ crate_name: "cov_mark",
+ cargo_env_compat: true,
+ cargo_pkg_version: "2.0.0",
+ crate_root: "src/lib.rs",
+ edition: "2021",
+ features: [
+ "default",
+ "enable",
+ ],
+ apex_available: [
+ "//apex_available:platform",
+ "//apex_available:anyapex",
+ ],
+ product_available: true,
+ vendor_available: true,
+}
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..df57fb5
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,46 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+rust-version = "1.63"
+name = "cov-mark"
+version = "2.0.0"
+authors = [
+ "Aleksey Kladov <aleksey.kladov@gmail.com>",
+ "Simonas Kazlauskas <cov-mark@kazlauskas.me>",
+]
+exclude = [
+ ".github/",
+ "bors.toml",
+ "rustfmt.toml",
+]
+description = "Manual coverage marks."
+documentation = "https://docs.rs/cov-mark"
+readme = "README.md"
+keywords = [
+ "coverage",
+ "test",
+]
+categories = ["development-tools"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/matklad/cov-mark"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = [
+ "--cfg",
+ "nightly_docs",
+]
+
+[features]
+default = ["enable"]
+enable = []
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..834f7db
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,28 @@
+[package]
+name = "cov-mark"
+version = "2.0.0"
+description = "Manual coverage marks."
+keywords = ["coverage", "test"]
+categories = ["development-tools"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/matklad/cov-mark"
+documentation = "https://docs.rs/cov-mark"
+authors = [
+ "Aleksey Kladov <aleksey.kladov@gmail.com>",
+ "Simonas Kazlauskas <cov-mark@kazlauskas.me>"
+]
+edition = "2021"
+rust-version = "1.63"
+
+exclude = [".github/", "bors.toml", "rustfmt.toml"]
+
+[workspace]
+members = ["xtask"]
+
+[features]
+default = ["enable"]
+enable = []
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "nightly_docs"]
diff --git a/LICENSE b/LICENSE
new file mode 120000
index 0000000..6b579aa
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1 @@
+LICENSE-APACHE
\ No newline at end of file
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
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+8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
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+ incidental, or consequential damages of any character arising as a
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+ of your accepting any such warranty or additional liability.
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+APPENDIX: How to apply the Apache License to your work.
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+ To apply the Apache License to your work, attach the following
+ boilerplate notice, with the fields enclosed by brackets "[]"
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
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+Unless required by applicable law or agreed to in writing, software
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diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..f2bf960
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,21 @@
+name: "cov-mark"
+description: "Manual coverage marks."
+third_party {
+ identifier {
+ type: "crates.io"
+ value: "cov-mark"
+ }
+ identifier {
+ type: "Archive"
+ value: "https://static.crates.io/crates/cov-mark/cov-mark-2.0.0.crate"
+ primary_source: true
+ }
+ version: "2.0.0"
+ # Dual-licensed, using the least restrictive per go/thirdpartylicenses#same.
+ license_type: NOTICE
+ last_upgrade_date {
+ year: 2024
+ month: 9
+ day: 6
+ }
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..ec40b04
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,3 @@
+# Bug component: 688011
+aaronyu@google.com
+include platform/prebuilts/rust:main:/OWNERS
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..81c1fce
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# cov-mark
+
+Verify that your tests exercise the conditions you think they are exercising
+
+```rust
+fn safe_divide(dividend: u32, divisor: u32) -> u32 {
+ if divisor == 0 {
+ cov_mark::hit!(save_divide_zero);
+ return 0;
+ }
+ dividend / divisor
+}
+
+#[test]
+fn test_safe_divide_by_zero() {
+ cov_mark::check!(save_divide_zero);
+ assert_eq!(safe_divide(92, 0), 0);
+}
+```
+
+See [the docs](https://docs.rs/cov-mark) for details
diff --git a/cargo_embargo.json b/cargo_embargo.json
new file mode 100644
index 0000000..9a0a579
--- /dev/null
+++ b/cargo_embargo.json
@@ -0,0 +1,3 @@
+{
+ "tests": true
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..0acc4f9
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,249 @@
+//! # cov-mark
+//!
+//! This library at its core provides two macros, [`hit!`] and [`check!`],
+//! which can be used to verify that a certain test exercises a certain code
+//! path.
+//!
+//! Here's a short example:
+//!
+//! ```
+//! fn parse_date(s: &str) -> Option<(u32, u32, u32)> {
+//! if 10 != s.len() {
+//! // By using `cov_mark::hit!`
+//! // we signal which test exercises this code.
+//! cov_mark::hit!(short_date);
+//! return None;
+//! }
+//!
+//! if "-" != &s[4..5] || "-" != &s[7..8] {
+//! cov_mark::hit!(bad_dashes);
+//! return None;
+//! }
+//! // ...
+//! # unimplemented!()
+//! }
+//!
+//! #[test]
+//! fn test_parse_date() {
+//! {
+//! // `cov_mark::check!` creates a guard object
+//! // that verifies that by the end of the scope we've
+//! // executed the corresponding `cov_mark::hit`.
+//! cov_mark::check!(short_date);
+//! assert!(parse_date("92").is_none());
+//! }
+//!
+//! // This will fail. Although the test looks like
+//! // it exercises the second condition, it does not.
+//! // The call to `check!` call catches this bug in the test.
+//! // {
+//! // cov_mark::check!(bad_dashes);
+//! // assert!(parse_date("27.2.2013").is_none());
+//! // }
+//!
+//! {
+//! cov_mark::check!(bad_dashes);
+//! assert!(parse_date("27.02.2013").is_none());
+//! }
+//! }
+//!
+//! # fn main() {}
+//! ```
+//!
+//! Here's why coverage marks are useful:
+//!
+//! * Verifying that something doesn't happen for the *right* reason.
+//! * Finding the test that exercises the code (grep for `check!(mark_name)`).
+//! * Finding the code that the test is supposed to check (grep for `hit!(mark_name)`).
+//! * Making sure that code and tests don't diverge during refactorings.
+//! * (If used pervasively) Verifying that each branch has a corresponding test.
+//!
+//! # Limitations
+//!
+//! * Names of marks must be globally unique.
+//!
+//! # Implementation Details
+//!
+//! Each coverage mark is an `AtomicUsize` counter. [`hit!`] increments
+//! this counter, [`check!`] returns a guard object which checks that
+//! the mark was incremented.
+//! Each counter is stored as a thread-local, allowing for accurate per-thread
+//! counting.
+
+#![cfg_attr(nightly_docs, deny(broken_intra_doc_links))]
+#![cfg_attr(nightly_docs, feature(doc_cfg))]
+
+/// Hit a mark with a specified name.
+///
+/// # Example
+///
+/// ```
+/// fn safe_divide(dividend: u32, divisor: u32) -> u32 {
+/// if divisor == 0 {
+/// cov_mark::hit!(save_divide_zero);
+/// return 0;
+/// }
+/// dividend / divisor
+/// }
+/// ```
+#[macro_export]
+macro_rules! hit {
+ ($ident:ident) => {
+ $crate::__rt::hit(stringify!($ident))
+ };
+}
+
+/// Checks that a specified mark was hit.
+///
+/// # Example
+///
+/// ```
+/// #[test]
+/// fn test_safe_divide_by_zero() {
+/// cov_mark::check!(save_divide_zero);
+/// assert_eq!(safe_divide(92, 0), 0);
+/// }
+/// # fn safe_divide(dividend: u32, divisor: u32) -> u32 {
+/// # if divisor == 0 {
+/// # cov_mark::hit!(save_divide_zero);
+/// # return 0;
+/// # }
+/// # dividend / divisor
+/// # }
+/// ```
+#[macro_export]
+macro_rules! check {
+ ($ident:ident) => {
+ let _guard = $crate::__rt::Guard::new(stringify!($ident), None);
+ };
+}
+
+/// Checks that a specified mark was hit exactly the specified number of times.
+///
+/// # Example
+///
+/// ```
+/// struct CoveredDropper;
+/// impl Drop for CoveredDropper {
+/// fn drop(&mut self) {
+/// cov_mark::hit!(covered_dropper_drops);
+/// }
+/// }
+///
+/// #[test]
+/// fn drop_count_test() {
+/// cov_mark::check_count!(covered_dropper_drops, 2);
+/// let _covered_dropper1 = CoveredDropper;
+/// let _covered_dropper2 = CoveredDropper;
+/// }
+/// ```
+#[macro_export]
+macro_rules! check_count {
+ ($ident:ident, $count: literal) => {
+ let _guard = $crate::__rt::Guard::new(stringify!($ident), Some($count));
+ };
+}
+
+#[doc(hidden)]
+#[cfg(feature = "enable")]
+pub mod __rt {
+ use std::{
+ cell::{Cell, RefCell},
+ rc::Rc,
+ sync::atomic::{AtomicUsize, Ordering::Relaxed},
+ };
+
+ /// Even with
+ /// https://github.com/rust-lang/rust/commit/641d3b09f41b441f2c2618de32983ad3d13ea3f8,
+ /// a `thread_local` generates significantly more verbose assembly on x86
+ /// than atomic, so we'll use atomic for the fast path
+ static LEVEL: AtomicUsize = AtomicUsize::new(0);
+
+ thread_local! {
+ static ACTIVE: RefCell<Vec<Rc<GuardInner>>> = Default::default();
+ }
+
+ #[inline(always)]
+ pub fn hit(key: &'static str) {
+ if LEVEL.load(Relaxed) > 0 {
+ hit_cold(key);
+ }
+
+ #[cold]
+ fn hit_cold(key: &'static str) {
+ ACTIVE.with(|it| it.borrow().iter().for_each(|g| g.hit(key)))
+ }
+ }
+
+ struct GuardInner {
+ mark: &'static str,
+ hits: Cell<usize>,
+ expected_hits: Option<usize>,
+ }
+
+ pub struct Guard {
+ inner: Rc<GuardInner>,
+ }
+
+ impl GuardInner {
+ fn hit(&self, key: &'static str) {
+ if key == self.mark {
+ self.hits.set(self.hits.get().saturating_add(1))
+ }
+ }
+ }
+
+ impl Guard {
+ pub fn new(mark: &'static str, expected_hits: Option<usize>) -> Guard {
+ let inner = GuardInner {
+ mark,
+ hits: Cell::new(0),
+ expected_hits,
+ };
+ let inner = Rc::new(inner);
+ LEVEL.fetch_add(1, Relaxed);
+ ACTIVE.with(|it| it.borrow_mut().push(Rc::clone(&inner)));
+ Guard { inner }
+ }
+ }
+
+ impl Drop for Guard {
+ fn drop(&mut self) {
+ LEVEL.fetch_sub(1, Relaxed);
+ let last = ACTIVE.with(|it| it.borrow_mut().pop());
+
+ if std::thread::panicking() {
+ return;
+ }
+
+ let last = last.unwrap();
+ assert!(Rc::ptr_eq(&last, &self.inner));
+ let hit_count = last.hits.get();
+ match last.expected_hits {
+ Some(hits) => assert!(
+ hit_count == hits,
+ "mark was hit {} times, expected {}",
+ hit_count,
+ hits
+ ),
+ None => assert!(hit_count > 0, "mark was not hit"),
+ }
+ }
+ }
+}
+
+#[doc(hidden)]
+#[cfg(not(feature = "enable"))]
+pub mod __rt {
+ #[inline(always)]
+ pub fn hit(_: &'static str) {}
+
+ #[non_exhaustive]
+ pub struct Guard;
+
+ impl Guard {
+ pub fn new(_: &'static str, _: Option<usize>) -> Guard {
+ Guard
+ }
+ }
+}
diff --git a/tests/smoke.rs b/tests/smoke.rs
new file mode 100644
index 0000000..102636a
--- /dev/null
+++ b/tests/smoke.rs
@@ -0,0 +1,27 @@
+fn safe_divide(dividend: u32, divisor: u32) -> u32 {
+ if divisor == 0 {
+ cov_mark::hit!(save_divide_zero);
+ return 0;
+ }
+ dividend / divisor
+}
+
+#[test]
+fn test_safe_divide_by_zero() {
+ cov_mark::check!(save_divide_zero);
+ assert_eq!(safe_divide(92, 0), 0);
+}
+
+struct CoveredDropper;
+impl Drop for CoveredDropper {
+ fn drop(&mut self) {
+ cov_mark::hit!(covered_dropper_drops);
+ }
+}
+
+#[test]
+fn test_drop_count() {
+ cov_mark::check_count!(covered_dropper_drops, 2);
+ let _covered_dropper1 = CoveredDropper;
+ let _covered_dropper2 = CoveredDropper;
+}
