Struct rustc_passes::reachable::ReachableContext

struct ReachableContext<'tcx> {
    tcx: TyCtxt<'tcx>,
    maybe_typeck_results: Option<&'tcx TypeckResults<'tcx>>,
    reachable_symbols: LocalDefIdSet,
    worklist: Vec<LocalDefId>,
    any_library: bool,
}

Fields

tcx: TyCtxt<'tcx>

maybe_typeck_results: Option<&'tcx TypeckResults<'tcx>>

reachable_symbols: LocalDefIdSet

worklist: Vec<LocalDefId>

any_library: bool

Implementations

impl<'tcx> ReachableContext<'tcx>

fn typeck_results(&self) -> &'tcx TypeckResults<'tcx>

Gets the type-checking results for the current body. As this will ICE if called outside bodies, only call when working with Expr or Pat nodes (they are guaranteed to be found only in bodies).

fn is_recursively_reachable_local(&self, def_id: DefId) -> bool

Returns true if the given def ID represents a local item that is recursive for reachability, i.e. whether everything mentioned in here also needs to be considered reachable.

There are two reasons why an item may be recursively reachable:

• It needs cross-crate MIR (see the module-level doc comment above).
• It is a const or const fn. This is not because we need the MIR to interpret them (MIR for const-eval and MIR for codegen is separate, and MIR for const-eval is always encoded). Instead, it is because const fn can create fn() pointers to other items which end up in the evaluated result of the constant and can then be called from other crates. Those items must be considered reachable.

fn propagate(&mut self)

fn propagate_node(&mut self, node: &Node<'tcx>, search_item: LocalDefId)

fn propagate_from_alloc(&mut self, alloc: ConstAllocation<'tcx>)

Finds things to add to reachable_symbols within allocations. In contrast to visit_nested_body this ignores things that were only needed to evaluate the allocation.

fn propagate_item(&mut self, res: Res)

Trait Implementations

impl<'tcx> DefIdVisitor<'tcx> for ReachableContext<'tcx>

type Result = ()

fn tcx(&self) -> TyCtxt<'tcx>

fn visit_def_id( &mut self, def_id: DefId, _kind: &str, _descr: &dyn Display, ) -> Self::Result

const SHALLOW: bool = false

const SKIP_ASSOC_TYS: bool = false

fn skeleton(&mut self) -> DefIdVisitorSkeleton<'_, 'tcx, Self>

Not overridden, but used to actually visit types and traits.

fn visit( &mut self, ty_fragment: impl TypeVisitable<TyCtxt<'tcx>>, ) -> Self::Result

fn visit_trait(&mut self, trait_ref: TraitRef<TyCtxt<'tcx>>) -> Self::Result

fn visit_predicates( &mut self, predicates: GenericPredicates<'tcx>, ) -> Self::Result

fn visit_clauses(&mut self, clauses: &[(Clause<'tcx>, Span)]) -> Self::Result

impl<'tcx> Visitor<'tcx> for ReachableContext<'tcx>

fn visit_nested_body(&mut self, body: BodyId)

Invoked to visit the body of a function, method or closure. Like visit_nested_item, does nothing by default unless you override Self::NestedFilter.

fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>)

fn visit_inline_asm(&mut self, asm: &'tcx InlineAsm<'tcx>, id: HirId)

type Map = <Self::NestedFilter as NestedFilter<'v>>::Map

type NestedFilter = None

Override this type to control which nested HIR are visited; see NestedFilter for details. If you override this type, you must also override nested_visit_map.

type Result = ()

The result type of the visit_* methods. Can be either (), or ControlFlow<T>.

fn nested_visit_map(&mut self) -> Self::Map

If type NestedFilter is set to visit nested items, this method must also be overridden to provide a map to retrieve nested items.

fn visit_nested_item(&mut self, id: ItemId) -> Self::Result

Invoked when a nested item is encountered. By default, when Self::NestedFilter is nested_filter::None, this method does nothing. You probably don’t want to override this method – instead, override Self::NestedFilter or use the “shallow” or “deep” visit patterns described at rustc_hir::intravisit. 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.

fn visit_nested_trait_item(&mut self, id: TraitItemId) -> Self::Result

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

fn visit_nested_impl_item(&mut self, id: ImplItemId) -> Self::Result

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

fn visit_nested_foreign_item(&mut self, id: ForeignItemId) -> Self::Result

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

fn visit_param(&mut self, param: &'v Param<'v>) -> Self::Result

fn visit_item(&mut self, i: &'v Item<'v>) -> Self::Result

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

fn visit_body(&mut self, b: &Body<'v>) -> Self::Result

fn visit_id(&mut self, _hir_id: HirId) -> Self::Result

fn visit_name(&mut self, _name: Symbol) -> Self::Result

fn visit_ident(&mut self, ident: Ident) -> Self::Result

fn visit_mod(&mut self, m: &'v Mod<'v>, _s: Span, n: HirId) -> Self::Result

fn visit_foreign_item(&mut self, i: &'v ForeignItem<'v>) -> Self::Result

fn visit_local(&mut self, l: &'v LetStmt<'v>) -> Self::Result

fn visit_block(&mut self, b: &'v Block<'v>) -> Self::Result

fn visit_stmt(&mut self, s: &'v Stmt<'v>) -> Self::Result

fn visit_arm(&mut self, a: &'v Arm<'v>) -> Self::Result

fn visit_pat(&mut self, p: &'v Pat<'v>) -> Self::Result

fn visit_pat_field(&mut self, f: &'v PatField<'v>) -> Self::Result

fn visit_array_length(&mut self, len: &'v ArrayLen<'v>) -> Self::Result

fn visit_anon_const(&mut self, c: &'v AnonConst) -> Self::Result

fn visit_inline_const(&mut self, c: &'v ConstBlock) -> Self::Result

fn visit_const_arg(&mut self, c: &'v ConstArg<'v>) -> Self::Result

fn visit_expr_field(&mut self, field: &'v ExprField<'v>) -> Self::Result

fn visit_ty(&mut self, t: &'v Ty<'v>) -> Self::Result

fn visit_pattern_type_pattern(&mut self, _p: &'v Pat<'v>)

fn visit_generic_param(&mut self, p: &'v GenericParam<'v>) -> Self::Result

fn visit_const_param_default( &mut self, _param: HirId, ct: &'v ConstArg<'v>, ) -> Self::Result

fn visit_generics(&mut self, g: &'v Generics<'v>) -> Self::Result

fn visit_where_predicate( &mut self, predicate: &'v WherePredicate<'v>, ) -> Self::Result

fn visit_fn_ret_ty(&mut self, ret_ty: &'v FnRetTy<'v>) -> Self::Result

fn visit_fn_decl(&mut self, fd: &'v FnDecl<'v>) -> Self::Result

fn visit_fn( &mut self, fk: FnKind<'v>, fd: &'v FnDecl<'v>, b: BodyId, _: Span, id: LocalDefId, ) -> Self::Result

fn visit_use( &mut self, path: &'v Path<'v, SmallVec<[Res; 3]>>, hir_id: HirId, ) -> Self::Result

fn visit_trait_item(&mut self, ti: &'v TraitItem<'v>) -> Self::Result

fn visit_trait_item_ref(&mut self, ii: &'v TraitItemRef) -> Self::Result

fn visit_impl_item(&mut self, ii: &'v ImplItem<'v>) -> Self::Result

fn visit_foreign_item_ref(&mut self, ii: &'v ForeignItemRef) -> Self::Result

fn visit_impl_item_ref(&mut self, ii: &'v ImplItemRef) -> Self::Result

fn visit_trait_ref(&mut self, t: &'v TraitRef<'v>) -> Self::Result

fn visit_param_bound(&mut self, bounds: &'v GenericBound<'v>) -> Self::Result

fn visit_precise_capturing_arg( &mut self, arg: &'v PreciseCapturingArg<'v>, ) -> Self::Result

fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef<'v>) -> Self::Result

fn visit_variant_data(&mut self, s: &'v VariantData<'v>) -> Self::Result

fn visit_field_def(&mut self, s: &'v FieldDef<'v>) -> Self::Result

fn visit_enum_def( &mut self, enum_definition: &'v EnumDef<'v>, item_id: HirId, ) -> Self::Result

fn visit_variant(&mut self, v: &'v Variant<'v>) -> Self::Result

fn visit_label(&mut self, label: &'v Label) -> Self::Result

fn visit_infer(&mut self, inf: &'v InferArg) -> Self::Result

fn visit_generic_arg(&mut self, generic_arg: &'v GenericArg<'v>) -> Self::Result

fn visit_lifetime(&mut self, lifetime: &'v Lifetime) -> Self::Result

fn visit_qpath( &mut self, qpath: &'v QPath<'v>, id: HirId, _span: Span, ) -> Self::Result

fn visit_path(&mut self, path: &Path<'v>, _id: HirId) -> Self::Result

fn visit_path_segment( &mut self, path_segment: &'v PathSegment<'v>, ) -> Self::Result

fn visit_generic_args( &mut self, generic_args: &'v GenericArgs<'v>, ) -> Self::Result

fn visit_assoc_item_constraint( &mut self, constraint: &'v AssocItemConstraint<'v>, ) -> Self::Result

fn visit_attribute(&mut self, _attr: &'v Attribute) -> Self::Result

fn visit_associated_item_kind( &mut self, kind: &'v AssocItemKind, ) -> Self::Result

fn visit_defaultness(&mut self, defaultness: &'v Defaultness) -> Self::Result

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: 80 bytes