Rollup merge of #107500 - bryangarza:future-sizes-baseline-test, r=co…

…mpiler-errors Add tests to assert current behavior of large future sizes Based on a couple of sources: - https://swatinem.de/blog/future-size/ - #62958
rust-lang · Feb 3, 2023 · 22aa680 · 22aa680
2 parents 2fdb355 + 1a65219
commit 22aa680
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diff --git a/tests/ui/async-await/future-sizes/future-as-arg.rs b/tests/ui/async-await/future-sizes/future-as-arg.rs
@@ -0,0 +1,16 @@
+// 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}");
+}
diff --git a/tests/ui/async-await/future-sizes/large-arg.rs b/tests/ui/async-await/future-sizes/large-arg.rs
@@ -0,0 +1,18 @@
+// 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
+}
diff --git a/tests/ui/async-await/future-sizes/large-arg.stdout b/tests/ui/async-await/future-sizes/large-arg.stdout
@@ -0,0 +1,60 @@
+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