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Compute generator sizes with -Zprint_type_sizes

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This commit is contained in:
Michael Goulet 2022-11-05 18:25:41 +00:00
parent 023b5136b5
commit b45b9489bb
6 changed files with 74 additions and 1 deletions
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3
compiler/rustc_session/src/code_stats.rs
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@ -33,6 +33,7 @@ pub enum DataTypeKind {
Union,
Enum,
Closure,
Generator,
}
#[derive(PartialEq, Eq, Hash, Debug)]
@ -113,7 +114,7 @@ impl CodeStats {
let mut max_variant_size = discr_size;
let struct_like = match kind {
DataTypeKind::Struct | DataTypeKind::Closure => true,
DataTypeKind::Struct | DataTypeKind::Closure | DataTypeKind::Generator => true,
DataTypeKind::Enum | DataTypeKind::Union => false,
};
for (i, variant_info) in variants.into_iter().enumerate() {

6
compiler/rustc_ty_utils/src/layout.rs
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@ -826,6 +826,12 @@ fn record_layout_for_printing_outlined<'tcx>(
return;
}
ty::Generator(..) => {
debug!("print-type-size t: `{:?}` record generator", layout.ty);
record(DataTypeKind::Generator, false, None, vec![]);
return;
}
_ => {
debug!("print-type-size t: `{:?}` skip non-nominal", layout.ty);
return;

19
src/test/ui/print_type_sizes/async.rs Normal file
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@ -0,0 +1,19 @@
// compile-flags: -Z print-type-sizes
// edition:2021
// build-pass
// ignore-pass
#![feature(start)]
async fn wait() {}
async fn test(arg: [u8; 8192]) {
wait().await;
drop(arg);
}
#[start]
fn start(_: isize, _: *const *const u8) -> isize {
let _ = test([0; 8192]);
0
}

25
src/test/ui/print_type_sizes/async.stdout Normal file
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@ -0,0 +1,25 @@
print-type-size type: `[static generator@$DIR/async.rs:10:32: 13:2]`: 16386 bytes, alignment: 1 bytes
print-type-size end padding: 16386 bytes
print-type-size type: `std::future::from_generator::GenFuture<[static generator@$DIR/async.rs:10:32: 13:2]>`: 16386 bytes, alignment: 1 bytes
print-type-size field `.0`: 16386 bytes
print-type-size type: `std::mem::ManuallyDrop<[u8; 8192]>`: 8192 bytes, alignment: 1 bytes
print-type-size field `.value`: 8192 bytes
print-type-size type: `std::mem::MaybeUninit<[u8; 8192]>`: 8192 bytes, alignment: 1 bytes
print-type-size variant `MaybeUninit`: 8192 bytes
print-type-size field `.uninit`: 0 bytes
print-type-size field `.value`: 8192 bytes
print-type-size type: `[static generator@$DIR/async.rs:8:17: 8:19]`: 1 bytes, alignment: 1 bytes
print-type-size end padding: 1 bytes
print-type-size type: `std::future::from_generator::GenFuture<[static generator@$DIR/async.rs:8:17: 8:19]>`: 1 bytes, alignment: 1 bytes
print-type-size field `.0`: 1 bytes
print-type-size type: `std::mem::ManuallyDrop<std::future::from_generator::GenFuture<[static generator@$DIR/async.rs:8:17: 8:19]>>`: 1 bytes, alignment: 1 bytes
print-type-size field `.value`: 1 bytes
print-type-size type: `std::mem::MaybeUninit<std::future::from_generator::GenFuture<[static generator@$DIR/async.rs:8:17: 8:19]>>`: 1 bytes, alignment: 1 bytes
print-type-size variant `MaybeUninit`: 1 bytes
print-type-size field `.uninit`: 0 bytes
print-type-size field `.value`: 1 bytes
print-type-size type: `std::task::Poll<()>`: 1 bytes, alignment: 1 bytes
print-type-size discriminant: 1 bytes
print-type-size variant `Ready`: 0 bytes
print-type-size field `.0`: 0 bytes
print-type-size variant `Pending`: 0 bytes

20
src/test/ui/print_type_sizes/generator.rs Normal file
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@ -0,0 +1,20 @@
// compile-flags: -Z print-type-sizes
// build-pass
// ignore-pass
#![feature(start, generators, generator_trait)]
use std::ops::Generator;
fn generator<const C: usize>(array: [u8; C]) -> impl Generator<Yield = (), Return = ()> {
move |()| {
yield ();
let _ = array;
}
}
#[start]
fn start(_: isize, _: *const *const u8) -> isize {
let _ = generator([0; 8192]);
0
}

2
src/test/ui/print_type_sizes/generator.stdout Normal file
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@ -0,0 +1,2 @@
print-type-size type: `[generator@$DIR/generator.rs:10:5: 10:14]`: 8193 bytes, alignment: 1 bytes
print-type-size end padding: 8193 bytes