Struct rustc_mir_build::build::scope::Scope

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struct Scope {
    source_scope: SourceScope,
    region_scope: Scope,
    drops: Vec<DropData>,
    moved_locals: Vec<Local>,
    cached_unwind_block: Option<DropIdx>,
    cached_coroutine_drop_block: Option<DropIdx>,
}

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§source_scope: SourceScope

The source scope this scope was created in.

§region_scope: Scope

the region span of this scope within source code.

§drops: Vec<DropData>

set of places to drop when exiting this scope. This starts out empty but grows as variables are declared during the building process. This is a stack, so we always drop from the end of the vector (top of the stack) first.

§moved_locals: Vec<Local>§cached_unwind_block: Option<DropIdx>

The drop index that will drop everything in and below this scope on an unwind path.

§cached_coroutine_drop_block: Option<DropIdx>

The drop index that will drop everything in and below this scope on a coroutine drop path.

Implementations§

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impl Scope

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fn needs_cleanup(&self) -> bool

Whether there’s anything to do for the cleanup path, that is, when unwinding through this scope. This includes destructors, but not StorageDead statements, which don’t get emitted at all for unwinding, for several reasons:

  • clang doesn’t emit llvm.lifetime.end for C++ unwinding
  • LLVM’s memory dependency analysis can’t handle it atm
  • polluting the cleanup MIR with StorageDead creates landing pads even though there’s no actual destructors
  • freeing up stack space has no effect during unwinding Note that for coroutines we do emit StorageDeads, for the use of optimizations in the MIR coroutine transform.
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fn invalidate_cache(&mut self)

Trait Implementations§

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impl Debug for Scope

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl Freeze for Scope

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impl RefUnwindSafe for Scope

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impl !Send for Scope

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impl !Sync for Scope

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impl Unpin for Scope

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impl UnwindSafe for Scope

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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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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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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fn from(t: T) -> T

Returns the argument unchanged.

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Calls U::from(self).

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
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Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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type Error = !

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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: 72 bytes