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What even is CoroutineInfo

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This commit is contained in:
Michael Goulet 2024-01-25 02:43:14 +00:00
parent 3004e8c44b
commit 07b7c77705
1 changed files with 15 additions and 4 deletions
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19
compiler/rustc_middle/src/mir/mod.rs
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@ -244,18 +244,23 @@ pub fn def_id(&self) -> DefId {
} }
} }
/// Additional information carried by a MIR body when it is lowered from a coroutine.
/// This information is modified as it is lowered during the `StateTransform` MIR pass,
/// so not all fields will be active at a given time. For example, the `yield_ty` is
/// taken out of the field after yields are turned into returns, and the `coroutine_drop`
/// body is only populated after the state transform pass.
#[derive(Clone, TyEncodable, TyDecodable, Debug, HashStable, TypeFoldable, TypeVisitable)] #[derive(Clone, TyEncodable, TyDecodable, Debug, HashStable, TypeFoldable, TypeVisitable)]
pub struct CoroutineInfo<'tcx> { pub struct CoroutineInfo<'tcx> {
/// The yield type of the function, if it is a coroutine. /// The yield type of the function. This field is removed after the state transform pass.
pub yield_ty: Option<Ty<'tcx>>, pub yield_ty: Option<Ty<'tcx>>,
/// The resume type of the function, if it is a coroutine. /// The resume type of the function. This field is removed after the state transform pass.
pub resume_ty: Option<Ty<'tcx>>, pub resume_ty: Option<Ty<'tcx>>,
/// Coroutine drop glue. /// Coroutine drop glue. This field is populated after the state transform pass.
pub coroutine_drop: Option<Body<'tcx>>, pub coroutine_drop: Option<Body<'tcx>>,
/// The layout of a coroutine. Produced by the state transformation. /// The layout of a coroutine. This field is populated after the state transform pass.
pub coroutine_layout: Option<CoroutineLayout<'tcx>>, pub coroutine_layout: Option<CoroutineLayout<'tcx>>,
/// If this is a coroutine then record the type of source expression that caused this coroutine /// If this is a coroutine then record the type of source expression that caused this coroutine
@ -303,6 +308,12 @@ pub struct Body<'tcx> {
/// and used for debuginfo. Indexed by a `SourceScope`. /// and used for debuginfo. Indexed by a `SourceScope`.
pub source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>, pub source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>,
/// Additional information carried by a MIR body when it is lowered from a coroutine.
///
/// Note that the coroutine drop shim, any promoted consts, and other synthetic MIR
/// bodies that come from processing a coroutine body are not typically coroutines
/// themselves, and should probably set this to `None` to avoid carrying redundant
/// information.
pub coroutine: Option<Box<CoroutineInfo<'tcx>>>, pub coroutine: Option<Box<CoroutineInfo<'tcx>>>,
/// Declarations of locals. /// Declarations of locals.