Struct rustc::middle::resolve_lifetime::LifetimeContext[][src]

struct LifetimeContext<'a, 'tcx: 'a> {
    tcx: TyCtxt<'a, 'tcx, 'tcx>,
    map: &'a mut NamedRegionMap,
    scope: &'a Scope<'a>,
    trait_ref_hack: bool,
    is_in_fn_syntax: bool,
    labels_in_fn: Vec<Ident>,
    xcrate_object_lifetime_defaults: DefIdMap<Vec<ObjectLifetimeDefault>>,
    lifetime_uses: &'a mut DefIdMap<LifetimeUseSet<'tcx>>,
}
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Fields

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Deep breath. Our representation for poly trait refs contains a single binder and thus we only allow a single level of quantification. However, the syntax of Rust permits quantification in two places, e.g., T: for <'a> Foo<'a> and for <'a, 'b> &'b T: Foo<'a>. In order to get the de Bruijn indices correct when representing these constraints, we should only introduce one scope. However, we want to support both locations for the quantifier and during lifetime resolution we want precise information (so we can't desugar in an earlier phase).

SO, if we encounter a quantifier at the outer scope, we set trait_ref_hack to true (and introduce a scope), and then if we encounter a quantifier at the inner scope, we error. If trait_ref_hack is false, then we introduce the scope at the inner quantifier.

I'm sorry.

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Used to disallow the use of in-band lifetimes in fn or Fn syntax.

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List of labels in the function/method currently under analysis.

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Cache for cross-crate per-definition object lifetime defaults.

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Methods

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

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Visits self by adding a scope and handling recursive walk over the contents with walk.

Handles visiting fns and methods. These are a bit complicated because we must distinguish early- vs late-bound lifetime parameters. We do this by checking which lifetimes appear within type bounds; those are early bound lifetimes, and the rest are late bound.

For example:

fn foo<'a,'b,'c,T:Trait<'b>>(...)

Here 'a and 'c are late bound but 'b is early bound. Note that early- and late-bound lifetimes may be interspersed together.

If early bound lifetimes are present, we separate them into their own list (and likewise for late bound). They will be numbered sequentially, starting from the lowest index that is already in scope (for a fn item, that will be 0, but for a method it might not be). Late bound lifetimes are resolved by name and associated with a binder id (binder_id), so the ordering is not important there.

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Returns the next index one would use for an early-bound-region if extending the current scope.

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Returns the next index one would use for an impl Trait that is being converted into an abstract type. This will be the next early index from the enclosing item, for the most part. See the abstract_type_parent field for more info.

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Returns true if, in the current scope, replacing '_ would be equivalent to a single-use lifetime.

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Sometimes we resolve a lifetime, but later find that it is an error (esp. around impl trait). In that case, we remove the entry into map.defs so as not to confuse later code.

Trait Implementations

impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx>
[src]

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The default versions of the visit_nested_XXX routines invoke this method to get a map to use. By selecting an enum variant, you control which kinds of nested HIR are visited; see NestedVisitorMap for details. By "nested HIR", we are referring to bits of HIR that are not directly embedded within one another but rather indirectly, through a table in the crate. This is done to control dependencies during incremental compilation: the non-inline bits of HIR can be tracked and hashed separately. Read more

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Invoked when a nested item is encountered. By default does nothing unless you override nested_visit_map to return Some(_), in which case it will walk the item. You probably don't want to override this method -- instead, override nested_visit_map or use the "shallow" or "deep" visit patterns described on itemlikevisit::ItemLikeVisitor. The only reason to override this method is if you want a nested pattern but cannot supply a Map; see nested_visit_map for advice. Read more

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Invoked to visit the body of a function, method or closure. Like visit_nested_item, does nothing by default unless you override nested_visit_map to return Some(_), in which case it will walk the body. Read more

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Visit the top-level item and (optionally) nested items / impl items. See visit_nested_item for details. Read more

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Like visit_nested_item(), but for trait items. See visit_nested_item() for advice on when to override this method. Read more

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Like visit_nested_item(), but for impl items. See visit_nested_item() for advice on when to override this method. Read more

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When invoking visit_all_item_likes(), you need to supply an item-like visitor. This method converts a "intra-visit" visitor into an item-like visitor that walks the entire tree. If you use this, you probably don't want to process the contents of nested item-like things, since the outer loop will visit them as well. Read more

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Auto Trait Implementations

impl<'a, 'tcx> !Send for LifetimeContext<'a, 'tcx>

impl<'a, 'tcx> !Sync for LifetimeContext<'a, 'tcx>