[][src]Struct rustc::middle::mem_categorization::MemCategorizationContext

pub struct MemCategorizationContext<'a, 'gcx: 'a + 'tcx, 'tcx: 'a> {
    pub tcx: TyCtxt<'a, 'gcx, 'tcx>,
    pub region_scope_tree: &'a ScopeTree,
    pub tables: &'a TypeckTables<'tcx>,
    rvalue_promotable_map: Option<Lrc<ItemLocalSet>>,
    infcx: Option<&'a InferCtxt<'a, 'gcx, 'tcx>>,
}
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Fields

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Methods

impl<'a, 'tcx> MemCategorizationContext<'a, 'tcx, 'tcx>
[src]

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impl<'a, 'gcx, 'tcx> MemCategorizationContext<'a, 'gcx, 'tcx>
[src]

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Creates a MemCategorizationContext during type inference. This is used during upvar analysis and a few other places. Because the typeck tables are not yet complete, the results from the analysis must be used with caution:

  • rvalue promotions are not known, so the lifetimes of temporaries may be overly conservative;
  • similarly, as the results of upvar analysis are not yet known, the results around upvar accesses may be incorrect.

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Returns the type of value that this pattern matches against. Some non-obvious cases:

  • a ref x binding matches against a value of type T and gives x the type &T; we return T.
  • a pattern with implicit derefs (thanks to default binding modes #42640) may look like Some(x) but in fact have implicit deref patterns attached (e.g., it is really &Some(x)). In that case, we return the "outermost" type (e.g., `&Option).

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Like pat_ty, but ignores implicit & patterns.

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Returns the lifetime of a temporary created by expr with id id. This could be 'static if id is part of a constant expression.

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Creates a cmt for an indexing operation ([]).

One subtle aspect of indexing that may not be immediately obvious: for anything other than a fixed-length vector, an operation like x[y] actually consists of two disjoint (from the point of view of borrowck) operations. The first is a deref of x to create a pointer p that points at the first element in the array. The second operation is an index which adds y*sizeof(T) to p to obtain the pointer to x[y]. cat_index will produce a resulting cmt containing both this deref and the indexing, presuming that base_cmt is not of fixed-length type.

Parameters

  • elt: the HIR node being indexed
  • base_cmt: the cmt of elt

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Trait Implementations

impl<'a, 'gcx: 'a + 'tcx, 'tcx: 'a> Clone for MemCategorizationContext<'a, 'gcx, 'tcx>
[src]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Auto Trait Implementations

impl<'a, 'gcx, 'tcx> !Send for MemCategorizationContext<'a, 'gcx, 'tcx>

impl<'a, 'gcx, 'tcx> !Sync for MemCategorizationContext<'a, 'gcx, 'tcx>

Blanket Implementations

impl<T> MaybeResult for T
[src]

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impl<'a, T> Captures for T where
    T: ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

Creates owned data from borrowed data, usually by cloning. Read more

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recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

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The type returned in the event of a conversion error.

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Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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The type returned in the event of a conversion error.

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Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
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Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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Gets the TypeId of self. Read more

impl<E> SpecializationError for E
[src]

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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
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impl<T> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> Erased for T