e8678b1030
coverage: Format all coverage tests with `rustfmt` As suggested by <https://github.com/rust-lang/rust/pull/119984#discussion_r1452856806>. Test files in `tests/` are normally ignored by `x fmt`, but sometimes those files end up being run through `rustfmt` anyway, either by `rust-analyzer` or by hand. When that happens, it's annoying to have to manually revert formatting changes that are unrelated to the actual changes being made. So it's helpful for the tests in the repository to already have standard formatting beforehand. However, there are several coverage tests that deliberately use non-standard formatting, so that line counts reveal more information about where code regions begin and end. In those cases, we can use `#[rustfmt::skip]` to prevent that code from being disturbed. ``@rustbot`` label +A-code-coverage
124 lines
3.4 KiB
Rust
124 lines
3.4 KiB
Rust
#![feature(coverage_attribute)]
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#![feature(custom_inner_attributes)] // for #![rustfmt::skip]
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#![feature(noop_waker)]
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#![allow(unused_assignments, dead_code)]
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#![rustfmt::skip]
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// edition: 2018
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// compile-flags: -Copt-level=1
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async fn c(x: u8) -> u8 {
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if x == 8 {
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1
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} else {
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0
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}
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}
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async fn d() -> u8 { 1 }
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async fn e() -> u8 { 1 } // unused function; executor does not block on `g()`
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async fn f() -> u8 { 1 }
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async fn foo() -> [bool; 10] { [false; 10] } // unused function; executor does not block on `h()`
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pub async fn g(x: u8) {
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match x {
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y if e().await == y => (),
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y if f().await == y => (),
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_ => (),
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}
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}
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async fn h(x: usize) { // The function signature is counted when called, but the body is not
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// executed (not awaited) so the open brace has a `0` count (at least when
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// displayed with `llvm-cov show` in color-mode).
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match x {
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y if foo().await[y] => (),
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_ => (),
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}
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}
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async fn i(x: u8) { // line coverage is 1, but there are 2 regions:
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// (a) the function signature, counted when the function is called; and
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// (b) the open brace for the function body, counted once when the body is
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// executed asynchronously.
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match x {
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y if c(x).await == y + 1 => { d().await; }
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y if f().await == y + 1 => (),
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_ => (),
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}
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}
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fn j(x: u8) {
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// non-async versions of `c()`, `d()`, and `f()` to make it similar to async `i()`.
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fn c(x: u8) -> u8 {
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if x == 8 {
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1 // This line appears covered, but the 1-character expression span covering the `1`
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// is not executed. (`llvm-cov show` displays a `^0` below the `1` ). This is because
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// `fn j()` executes the open brace for the function body, followed by the function's
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// first executable statement, `match x`. Inner function declarations are not
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// "visible" to the MIR for `j()`, so the code region counts all lines between the
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// open brace and the first statement as executed, which is, in a sense, true.
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// `llvm-cov show` overcomes this kind of situation by showing the actual counts
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// of the enclosed coverages, (that is, the `1` expression was not executed, and
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// accurately displays a `0`).
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} else {
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0
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}
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}
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fn d() -> u8 { 1 } // inner function is defined in-line, but the function is not executed
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fn f() -> u8 { 1 }
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match x {
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y if c(x) == y + 1 => { d(); }
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y if f() == y + 1 => (),
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_ => (),
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}
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}
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fn k(x: u8) { // unused function
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match x {
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1 => (),
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2 => (),
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_ => (),
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}
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}
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fn l(x: u8) {
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match x {
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1 => (),
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2 => (),
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_ => (),
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}
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}
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async fn m(x: u8) -> u8 { x - 1 }
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fn main() {
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let _ = g(10);
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let _ = h(9);
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let mut future = Box::pin(i(8));
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j(7);
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l(6);
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let _ = m(5);
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executor::block_on(future.as_mut());
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}
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mod executor {
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use core::future::Future;
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use core::pin::pin;
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use core::task::{Context, Poll, Waker};
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#[coverage(off)]
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pub fn block_on<F: Future>(mut future: F) -> F::Output {
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let mut future = pin!(future);
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let mut context = Context::from_waker(Waker::noop());
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loop {
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if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
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break val;
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}
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}
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}
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}
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