mirror of https://github.com/rust-lang/rust
132 lines
5.4 KiB
Plaintext
132 lines
5.4 KiB
Plaintext
LL| |#![feature(coverage_attribute)]
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LL| |#![feature(custom_inner_attributes)] // for #![rustfmt::skip]
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LL| |#![feature(noop_waker)]
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LL| |#![allow(unused_assignments, dead_code)]
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LL| |#![rustfmt::skip]
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LL| |//@ edition: 2018
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LL| |//@ compile-flags: -Copt-level=1
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LL| |
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LL| 1|async fn c(x: u8) -> u8 {
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LL| 1| if x == 8 {
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LL| 1| 1
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LL| | } else {
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LL| 0| 0
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LL| | }
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LL| 1|}
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LL| |
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LL| 0|async fn d() -> u8 { 1 }
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LL| |
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LL| 0|async fn e() -> u8 { 1 } // unused function; executor does not block on `g()`
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LL| |
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LL| 1|async fn f() -> u8 { 1 }
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LL| |
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LL| 0|async fn foo() -> [bool; 10] { [false; 10] } // unused function; executor does not block on `h()`
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LL| |
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LL| 1|pub async fn g(x: u8) {
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LL| 0| match x {
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LL| 0| y if e().await == y => (),
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LL| 0| y if f().await == y => (),
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LL| 0| _ => (),
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LL| | }
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LL| 0|}
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LL| |
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LL| 1|async fn h(x: usize) { // The function signature is counted when called, but the body is not
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LL| 0| // executed (not awaited) so the open brace has a `0` count (at least when
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LL| 0| // displayed with `llvm-cov show` in color-mode).
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LL| 0| match x {
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LL| 0| y if foo().await[y] => (),
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LL| 0| _ => (),
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LL| | }
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LL| 0|}
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LL| |
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LL| 1|async fn i(x: u8) { // line coverage is 1, but there are 2 regions:
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LL| 1| // (a) the function signature, counted when the function is called; and
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LL| 1| // (b) the open brace for the function body, counted once when the body is
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LL| 1| // executed asynchronously.
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LL| 1| match x {
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LL| 1| y if c(x).await == y + 1 => { d().await; }
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^0 ^0 ^0 ^0
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LL| 1| y if f().await == y + 1 => (),
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^0 ^0 ^0
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LL| 1| _ => (),
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LL| | }
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LL| 1|}
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LL| |
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LL| 1|fn j(x: u8) {
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LL| 1| // non-async versions of `c()`, `d()`, and `f()` to make it similar to async `i()`.
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LL| 1| fn c(x: u8) -> u8 {
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LL| 1| if x == 8 {
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LL| 1| 1 // This line appears covered, but the 1-character expression span covering the `1`
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^0
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LL| 1| // is not executed. (`llvm-cov show` displays a `^0` below the `1` ). This is because
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LL| 1| // `fn j()` executes the open brace for the function body, followed by the function's
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LL| 1| // first executable statement, `match x`. Inner function declarations are not
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LL| 1| // "visible" to the MIR for `j()`, so the code region counts all lines between the
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LL| 1| // open brace and the first statement as executed, which is, in a sense, true.
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LL| 1| // `llvm-cov show` overcomes this kind of situation by showing the actual counts
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LL| 1| // of the enclosed coverages, (that is, the `1` expression was not executed, and
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LL| 1| // accurately displays a `0`).
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LL| 1| } else {
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LL| 1| 0
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LL| 1| }
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LL| 1| }
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LL| 1| fn d() -> u8 { 1 } // inner function is defined in-line, but the function is not executed
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^0
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LL| 1| fn f() -> u8 { 1 }
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LL| 1| match x {
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LL| 1| y if c(x) == y + 1 => { d(); }
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^0 ^0
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LL| 1| y if f() == y + 1 => (),
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^0 ^0
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LL| 1| _ => (),
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LL| | }
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LL| 1|}
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LL| |
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LL| 0|fn k(x: u8) { // unused function
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LL| 0| match x {
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LL| 0| 1 => (),
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LL| 0| 2 => (),
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LL| 0| _ => (),
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LL| | }
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LL| 0|}
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LL| |
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LL| 1|fn l(x: u8) {
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LL| 1| match x {
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LL| 0| 1 => (),
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LL| 0| 2 => (),
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LL| 1| _ => (),
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LL| | }
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LL| 1|}
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LL| |
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LL| 1|async fn m(x: u8) -> u8 { x - 1 }
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^0
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LL| |
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LL| 1|fn main() {
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LL| 1| let _ = g(10);
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LL| 1| let _ = h(9);
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LL| 1| let mut future = Box::pin(i(8));
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LL| 1| j(7);
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LL| 1| l(6);
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LL| 1| let _ = m(5);
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LL| 1| executor::block_on(future.as_mut());
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LL| 1|}
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LL| |
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LL| |mod executor {
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LL| | use core::future::Future;
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LL| | use core::pin::pin;
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LL| | use core::task::{Context, Poll, Waker};
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LL| |
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LL| | #[coverage(off)]
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LL| | pub fn block_on<F: Future>(mut future: F) -> F::Output {
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LL| | let mut future = pin!(future);
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LL| | let mut context = Context::from_waker(Waker::noop());
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LL| |
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LL| | loop {
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LL| | if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
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LL| | break val;
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LL| | }
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LL| | }
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LL| | }
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LL| |}
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