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Add tests to assert current behavior of large future sizes #107500

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merged 5 commits into from
Feb 3, 2023
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Merged

Add tests to assert current behavior of large future sizes #107500

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cc8f990
Add tests to assert current behavior of large future sizes
bryangarza Jan 31, 2023
7e56265
Update based on PR comments
bryangarza Jan 31, 2023
cb6de47
Move ignore-pass to large-arg test
bryangarza Jan 31, 2023
7769189
Update test to not trigger stack overflow
bryangarza Feb 1, 2023
1a65219
Bless tests after rebase
bryangarza Feb 2, 2023
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16 changes: 16 additions & 0 deletions tests/ui/async-await/future-sizes/future-as-arg.rs
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// edition: 2021
// run-pass

async fn test(_arg: [u8; 16]) {}

async fn use_future(fut: impl std::future::Future<Output = ()>) {
fut.await
}

fn main() {
let actual = std::mem::size_of_val(
&use_future(use_future(use_future(use_future(use_future(test([0; 16])))))));
// Not using an exact number in case it slightly changes over different commits
let expected = 550;
assert!(actual > expected, "expected: >{expected}, actual: {actual}");
}
18 changes: 18 additions & 0 deletions tests/ui/async-await/future-sizes/large-arg.rs
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// compile-flags: -Z print-type-sizes --crate-type=lib
// edition: 2021
// build-pass
// ignore-pass

pub async fn test() {
let _ = a([0u8; 1024]).await;
}

pub async fn a<T>(t: T) -> T {
b(t).await
}
async fn b<T>(t: T) -> T {
c(t).await
}
async fn c<T>(t: T) -> T {
t
}
60 changes: 60 additions & 0 deletions tests/ui/async-await/future-sizes/large-arg.stdout
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print-type-size type: `[async fn body@$DIR/large-arg.rs:6:21: 8:2]`: 3076 bytes, alignment: 1 bytes
print-type-size discriminant: 1 bytes
print-type-size variant `Suspend0`: 3075 bytes
print-type-size local `.__awaitee`: 3075 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size variant `Unresumed`: 0 bytes
print-type-size variant `Returned`: 0 bytes
print-type-size variant `Panicked`: 0 bytes
print-type-size type: `[async fn body@$DIR/large-arg.rs:10:30: 12:2]`: 3075 bytes, alignment: 1 bytes
print-type-size discriminant: 1 bytes
print-type-size variant `Suspend0`: 3074 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size local `.__awaitee`: 2050 bytes
print-type-size variant `Unresumed`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size variant `Returned`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size variant `Panicked`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size type: `std::mem::ManuallyDrop<[async fn body@$DIR/large-arg.rs:10:30: 12:2]>`: 3075 bytes, alignment: 1 bytes
print-type-size field `.value`: 3075 bytes
print-type-size type: `std::mem::MaybeUninit<[async fn body@$DIR/large-arg.rs:10:30: 12:2]>`: 3075 bytes, alignment: 1 bytes
print-type-size variant `MaybeUninit`: 3075 bytes
print-type-size field `.uninit`: 0 bytes
print-type-size field `.value`: 3075 bytes
print-type-size type: `[async fn body@$DIR/large-arg.rs:13:26: 15:2]`: 2050 bytes, alignment: 1 bytes
print-type-size discriminant: 1 bytes
print-type-size variant `Suspend0`: 2049 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size local `.__awaitee`: 1025 bytes
print-type-size variant `Unresumed`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size variant `Returned`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size variant `Panicked`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size type: `std::mem::ManuallyDrop<[async fn body@$DIR/large-arg.rs:13:26: 15:2]>`: 2050 bytes, alignment: 1 bytes
print-type-size field `.value`: 2050 bytes
print-type-size type: `std::mem::MaybeUninit<[async fn body@$DIR/large-arg.rs:13:26: 15:2]>`: 2050 bytes, alignment: 1 bytes
print-type-size variant `MaybeUninit`: 2050 bytes
print-type-size field `.uninit`: 0 bytes
print-type-size field `.value`: 2050 bytes
print-type-size type: `[async fn body@$DIR/large-arg.rs:16:26: 18:2]`: 1025 bytes, alignment: 1 bytes
print-type-size discriminant: 1 bytes
print-type-size variant `Unresumed`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size variant `Returned`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size variant `Panicked`: 1024 bytes
print-type-size upvar `.t`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
print-type-size type: `std::mem::ManuallyDrop<[async fn body@$DIR/large-arg.rs:16:26: 18:2]>`: 1025 bytes, alignment: 1 bytes
print-type-size field `.value`: 1025 bytes
print-type-size type: `std::mem::MaybeUninit<[async fn body@$DIR/large-arg.rs:16:26: 18:2]>`: 1025 bytes, alignment: 1 bytes
print-type-size variant `MaybeUninit`: 1025 bytes
print-type-size field `.uninit`: 0 bytes
print-type-size field `.value`: 1025 bytes
print-type-size type: `std::task::Poll<[u8; 1024]>`: 1025 bytes, alignment: 1 bytes
print-type-size discriminant: 1 bytes
print-type-size variant `Ready`: 1024 bytes
print-type-size field `.0`: 1024 bytes
print-type-size variant `Pending`: 0 bytes