Struct rustc_middle::ty::context::CurrentGcx

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pub struct CurrentGcx {
    value: Lrc<RwLock<Option<*const ()>>>,
}
Expand description

This is used to get a reference to a GlobalCtxt if one is available.

This is needed to allow the deadlock handler access to GlobalCtxt to look for query cycles. It cannot use the TLV global because that’s only guaranteed to be defined on the thread creating the GlobalCtxt. Other threads have access to the TLV only inside Rayon jobs, but the deadlock handler is not called inside such a job.

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§value: Lrc<RwLock<Option<*const ()>>>

This stores a pointer to a GlobalCtxt. This is set to Some inside GlobalCtxt::enter and reset to None when that function returns or unwinds.

Implementations§

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impl CurrentGcx

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pub fn new() -> Self

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pub fn access<R>( &self, f: impl for<'tcx> FnOnce(&'tcx GlobalCtxt<'tcx>) -> R, ) -> R

Trait Implementations§

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impl Clone for CurrentGcx

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fn clone(&self) -> CurrentGcx

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl<T> Aligned for T

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const ALIGN: Alignment = _

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fn borrow_mut(&mut self) -> &mut T

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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fn into_query_param(self) -> P

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes