mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 07:14:28 +00:00
140 lines
5.9 KiB
Plaintext
140 lines
5.9 KiB
Plaintext
1| |#![allow(unused_assignments, dead_code)]
|
|
2| |
|
|
3| |// compile-flags: --edition=2018 -C opt-level=1
|
|
4| |
|
|
5| 1|async fn c(x: u8) -> u8 {
|
|
6| 1| if x == 8 {
|
|
7| 1| 1
|
|
8| | } else {
|
|
9| 0| 0
|
|
10| | }
|
|
11| 1|}
|
|
12| |
|
|
13| 0|async fn d() -> u8 { 1 }
|
|
14| |
|
|
15| 0|async fn e() -> u8 { 1 } // unused function; executor does not block on `g()`
|
|
16| |
|
|
17| 1|async fn f() -> u8 { 1 }
|
|
18| |
|
|
19| 0|async fn foo() -> [bool; 10] { [false; 10] } // unused function; executor does not block on `h()`
|
|
20| |
|
|
21| 1|pub async fn g(x: u8) {
|
|
22| 0| match x {
|
|
23| 0| y if e().await == y => (),
|
|
24| 0| y if f().await == y => (),
|
|
25| 0| _ => (),
|
|
26| | }
|
|
27| 0|}
|
|
28| |
|
|
29| 1|async fn h(x: usize) { // The function signature is counted when called, but the body is not
|
|
30| 0| // executed (not awaited) so the open brace has a `0` count (at least when
|
|
31| 0| // displayed with `llvm-cov show` in color-mode).
|
|
32| 0| match x {
|
|
33| 0| y if foo().await[y] => (),
|
|
34| 0| _ => (),
|
|
35| | }
|
|
36| 0|}
|
|
37| |
|
|
38| 1|async fn i(x: u8) { // line coverage is 1, but there are 2 regions:
|
|
39| 1| // (a) the function signature, counted when the function is called; and
|
|
40| 1| // (b) the open brace for the function body, counted once when the body is
|
|
41| 1| // executed asynchronously.
|
|
42| 1| match x {
|
|
43| 1| y if c(x).await == y + 1 => { d().await; }
|
|
^0 ^0 ^0 ^0
|
|
44| 1| y if f().await == y + 1 => (),
|
|
^0 ^0 ^0
|
|
45| 1| _ => (),
|
|
46| | }
|
|
47| 1|}
|
|
48| |
|
|
49| 1|fn j(x: u8) {
|
|
50| 1| // non-async versions of `c()`, `d()`, and `f()` to make it similar to async `i()`.
|
|
51| 1| fn c(x: u8) -> u8 {
|
|
52| 1| if x == 8 {
|
|
53| 1| 1 // This line appears covered, but the 1-character expression span covering the `1`
|
|
^0
|
|
54| 1| // is not executed. (`llvm-cov show` displays a `^0` below the `1` ). This is because
|
|
55| 1| // `fn j()` executes the open brace for the function body, followed by the function's
|
|
56| 1| // first executable statement, `match x`. Inner function declarations are not
|
|
57| 1| // "visible" to the MIR for `j()`, so the code region counts all lines between the
|
|
58| 1| // open brace and the first statement as executed, which is, in a sense, true.
|
|
59| 1| // `llvm-cov show` overcomes this kind of situation by showing the actual counts
|
|
60| 1| // of the enclosed coverages, (that is, the `1` expression was not executed, and
|
|
61| 1| // accurately displays a `0`).
|
|
62| 1| } else {
|
|
63| 1| 0
|
|
64| 1| }
|
|
65| 1| }
|
|
66| 1| fn d() -> u8 { 1 } // inner function is defined in-line, but the function is not executed
|
|
^0
|
|
67| 1| fn f() -> u8 { 1 }
|
|
68| 1| match x {
|
|
69| 1| y if c(x) == y + 1 => { d(); }
|
|
^0 ^0
|
|
70| 1| y if f() == y + 1 => (),
|
|
^0 ^0
|
|
71| 1| _ => (),
|
|
72| | }
|
|
73| 1|}
|
|
74| |
|
|
75| 0|fn k(x: u8) { // unused function
|
|
76| 0| match x {
|
|
77| 0| 1 => (),
|
|
78| 0| 2 => (),
|
|
79| 0| _ => (),
|
|
80| | }
|
|
81| 0|}
|
|
82| |
|
|
83| 1|fn l(x: u8) {
|
|
84| 1| match x {
|
|
85| 0| 1 => (),
|
|
86| 0| 2 => (),
|
|
87| 1| _ => (),
|
|
88| | }
|
|
89| 1|}
|
|
90| |
|
|
91| 1|async fn m(x: u8) -> u8 { x - 1 }
|
|
^0
|
|
92| |
|
|
93| 1|fn main() {
|
|
94| 1| let _ = g(10);
|
|
95| 1| let _ = h(9);
|
|
96| 1| let mut future = Box::pin(i(8));
|
|
97| 1| j(7);
|
|
98| 1| l(6);
|
|
99| 1| let _ = m(5);
|
|
100| 1| executor::block_on(future.as_mut());
|
|
101| 1|}
|
|
102| |
|
|
103| |mod executor {
|
|
104| | use core::{
|
|
105| | future::Future,
|
|
106| | pin::Pin,
|
|
107| | task::{Context, Poll, RawWaker, RawWakerVTable, Waker},
|
|
108| | };
|
|
109| |
|
|
110| 1| pub fn block_on<F: Future>(mut future: F) -> F::Output {
|
|
111| 1| let mut future = unsafe { Pin::new_unchecked(&mut future) };
|
|
112| 1| use std::hint::unreachable_unchecked;
|
|
113| 1| static VTABLE: RawWakerVTable = RawWakerVTable::new(
|
|
114| 1| |_| unsafe { unreachable_unchecked() }, // clone
|
|
^0
|
|
115| 1| |_| unsafe { unreachable_unchecked() }, // wake
|
|
^0
|
|
116| 1| |_| unsafe { unreachable_unchecked() }, // wake_by_ref
|
|
^0
|
|
117| 1| |_| (),
|
|
118| 1| );
|
|
119| 1| let waker = unsafe { Waker::from_raw(RawWaker::new(core::ptr::null(), &VTABLE)) };
|
|
120| 1| let mut context = Context::from_waker(&waker);
|
|
121| |
|
|
122| | loop {
|
|
123| 1| if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
|
|
124| 1| break val;
|
|
125| 0| }
|
|
126| | }
|
|
127| 1| }
|
|
128| |}
|
|
|