Struct rustc::middle::region::RegionResolutionVisitor [−][src]
struct RegionResolutionVisitor<'a, 'tcx: 'a> { tcx: TyCtxt<'a, 'tcx, 'tcx>, expr_and_pat_count: usize, scope_tree: ScopeTree, cx: Context, terminating_scopes: FxHashSet<ItemLocalId>, }
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Fields
tcx: TyCtxt<'a, 'tcx, 'tcx>
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expr_and_pat_count: usize
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scope_tree: ScopeTree
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cx: Context
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terminating_scopes: FxHashSet<ItemLocalId>
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terminating_scopes
is a set containing the ids of each
statement, or conditional/repeating expression. These scopes
are calling "terminating scopes" because, when attempting to
find the scope of a temporary, by default we search up the
enclosing scopes until we encounter the terminating scope. A
conditional/repeating expression is one which is not
guaranteed to execute exactly once upon entering the parent
scope. This could be because the expression only executes
conditionally, such as the expression b
in a && b
, or
because the expression may execute many times, such as a loop
body. The reason that we distinguish such expressions is that,
upon exiting the parent scope, we cannot statically know how
many times the expression executed, and thus if the expression
creates temporaries we cannot know statically how many such
temporaries we would have to cleanup. Therefore we ensure that
the temporaries never outlast the conditional/repeating
expression, preventing the need for dynamic checks and/or
arbitrary amounts of stack space. Terminating scopes end
up being contained in a DestructionScope that contains the
destructor's execution.
Methods
impl<'a, 'tcx> RegionResolutionVisitor<'a, 'tcx>
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impl<'a, 'tcx> RegionResolutionVisitor<'a, 'tcx>
fn record_child_scope(&mut self, child_scope: Scope) -> ScopeDepth
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fn record_child_scope(&mut self, child_scope: Scope) -> ScopeDepth
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Records the current parent (if any) as the parent of child_scope
.
Returns the depth of child_scope
.
fn enter_scope(&mut self, child_scope: Scope)
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fn enter_scope(&mut self, child_scope: Scope)
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Records the current parent (if any) as the parent of child_scope
,
and sets child_scope
as the new current parent.
fn enter_node_scope_with_dtor(&mut self, id: ItemLocalId)
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fn enter_node_scope_with_dtor(&mut self, id: ItemLocalId)
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Trait Implementations
impl<'a, 'tcx> Visitor<'tcx> for RegionResolutionVisitor<'a, 'tcx>
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impl<'a, 'tcx> Visitor<'tcx> for RegionResolutionVisitor<'a, 'tcx>
fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx>
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fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx>
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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
fn visit_block(&mut self, b: &'tcx Block)
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fn visit_block(&mut self, b: &'tcx Block)
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fn visit_body(&mut self, body: &'tcx Body)
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fn visit_body(&mut self, body: &'tcx Body)
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fn visit_arm(&mut self, a: &'tcx Arm)
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fn visit_arm(&mut self, a: &'tcx Arm)
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fn visit_pat(&mut self, p: &'tcx Pat)
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fn visit_pat(&mut self, p: &'tcx Pat)
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fn visit_stmt(&mut self, s: &'tcx Stmt)
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fn visit_stmt(&mut self, s: &'tcx Stmt)
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fn visit_expr(&mut self, ex: &'tcx Expr)
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fn visit_expr(&mut self, ex: &'tcx Expr)
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fn visit_local(&mut self, l: &'tcx Local)
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fn visit_local(&mut self, l: &'tcx Local)
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fn visit_nested_item(&mut self, id: ItemId)
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fn visit_nested_item(&mut self, id: ItemId)
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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
fn visit_nested_trait_item(&mut self, id: TraitItemId)
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fn visit_nested_trait_item(&mut self, id: TraitItemId)
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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
fn visit_nested_impl_item(&mut self, id: ImplItemId)
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fn visit_nested_impl_item(&mut self, id: ImplItemId)
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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
fn visit_nested_body(&mut self, id: BodyId)
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fn visit_nested_body(&mut self, id: BodyId)
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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
fn visit_item(&mut self, i: &'v Item)
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fn visit_item(&mut self, i: &'v Item)
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Visit the top-level item and (optionally) nested items / impl items. See visit_nested_item
for details. Read more
fn as_deep_visitor<'s>(&'s mut self) -> DeepVisitor<'s, Self>
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fn as_deep_visitor<'s>(&'s mut self) -> DeepVisitor<'s, Self>
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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
fn visit_id(&mut self, _node_id: NodeId)
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fn visit_id(&mut self, _node_id: NodeId)
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fn visit_def_mention(&mut self, _def: Def)
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fn visit_def_mention(&mut self, _def: Def)
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fn visit_name(&mut self, _span: Span, _name: Name)
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fn visit_name(&mut self, _span: Span, _name: Name)
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fn visit_ident(&mut self, ident: Ident)
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fn visit_ident(&mut self, ident: Ident)
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fn visit_mod(&mut self, m: &'v Mod, _s: Span, n: NodeId)
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fn visit_mod(&mut self, m: &'v Mod, _s: Span, n: NodeId)
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fn visit_foreign_item(&mut self, i: &'v ForeignItem)
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fn visit_foreign_item(&mut self, i: &'v ForeignItem)
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fn visit_decl(&mut self, d: &'v Decl)
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fn visit_decl(&mut self, d: &'v Decl)
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fn visit_anon_const(&mut self, c: &'v AnonConst)
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fn visit_anon_const(&mut self, c: &'v AnonConst)
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fn visit_ty(&mut self, t: &'v Ty)
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fn visit_ty(&mut self, t: &'v Ty)
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fn visit_generic_param(&mut self, p: &'v GenericParam)
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fn visit_generic_param(&mut self, p: &'v GenericParam)
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fn visit_generics(&mut self, g: &'v Generics)
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fn visit_generics(&mut self, g: &'v Generics)
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fn visit_where_predicate(&mut self, predicate: &'v WherePredicate)
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fn visit_where_predicate(&mut self, predicate: &'v WherePredicate)
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fn visit_fn_decl(&mut self, fd: &'v FnDecl)
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fn visit_fn_decl(&mut self, fd: &'v FnDecl)
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fn visit_fn(
&mut self,
fk: FnKind<'v>,
fd: &'v FnDecl,
b: BodyId,
s: Span,
id: NodeId
)
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fn visit_fn(
&mut self,
fk: FnKind<'v>,
fd: &'v FnDecl,
b: BodyId,
s: Span,
id: NodeId
)
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fn visit_trait_item(&mut self, ti: &'v TraitItem)
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fn visit_trait_item(&mut self, ti: &'v TraitItem)
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fn visit_trait_item_ref(&mut self, ii: &'v TraitItemRef)
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fn visit_trait_item_ref(&mut self, ii: &'v TraitItemRef)
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fn visit_impl_item(&mut self, ii: &'v ImplItem)
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fn visit_impl_item(&mut self, ii: &'v ImplItem)
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fn visit_impl_item_ref(&mut self, ii: &'v ImplItemRef)
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fn visit_impl_item_ref(&mut self, ii: &'v ImplItemRef)
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fn visit_trait_ref(&mut self, t: &'v TraitRef)
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fn visit_trait_ref(&mut self, t: &'v TraitRef)
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fn visit_param_bound(&mut self, bounds: &'v GenericBound)
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fn visit_param_bound(&mut self, bounds: &'v GenericBound)
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fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef, m: TraitBoundModifier)
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fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef, m: TraitBoundModifier)
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fn visit_variant_data(
&mut self,
s: &'v VariantData,
_: Name,
_: &'v Generics,
_parent_id: NodeId,
_: Span
)
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fn visit_variant_data(
&mut self,
s: &'v VariantData,
_: Name,
_: &'v Generics,
_parent_id: NodeId,
_: Span
)
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fn visit_struct_field(&mut self, s: &'v StructField)
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fn visit_struct_field(&mut self, s: &'v StructField)
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fn visit_enum_def(
&mut self,
enum_definition: &'v EnumDef,
generics: &'v Generics,
item_id: NodeId,
_: Span
)
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fn visit_enum_def(
&mut self,
enum_definition: &'v EnumDef,
generics: &'v Generics,
item_id: NodeId,
_: Span
)
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fn visit_variant(&mut self, v: &'v Variant, g: &'v Generics, item_id: NodeId)
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fn visit_variant(&mut self, v: &'v Variant, g: &'v Generics, item_id: NodeId)
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fn visit_label(&mut self, label: &'v Label)
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fn visit_label(&mut self, label: &'v Label)
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fn visit_generic_arg(&mut self, generic_arg: &'v GenericArg)
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fn visit_generic_arg(&mut self, generic_arg: &'v GenericArg)
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fn visit_lifetime(&mut self, lifetime: &'v Lifetime)
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fn visit_lifetime(&mut self, lifetime: &'v Lifetime)
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fn visit_qpath(&mut self, qpath: &'v QPath, id: NodeId, span: Span)
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fn visit_qpath(&mut self, qpath: &'v QPath, id: NodeId, span: Span)
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fn visit_path(&mut self, path: &'v Path, _id: NodeId)
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fn visit_path(&mut self, path: &'v Path, _id: NodeId)
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fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v PathSegment)
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fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v PathSegment)
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fn visit_generic_args(&mut self, path_span: Span, generic_args: &'v GenericArgs)
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fn visit_generic_args(&mut self, path_span: Span, generic_args: &'v GenericArgs)
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fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding)
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fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding)
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fn visit_attribute(&mut self, _attr: &'v Attribute)
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fn visit_attribute(&mut self, _attr: &'v Attribute)
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fn visit_macro_def(&mut self, macro_def: &'v MacroDef)
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fn visit_macro_def(&mut self, macro_def: &'v MacroDef)
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fn visit_vis(&mut self, vis: &'v Visibility)
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fn visit_vis(&mut self, vis: &'v Visibility)
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fn visit_associated_item_kind(&mut self, kind: &'v AssociatedItemKind)
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fn visit_associated_item_kind(&mut self, kind: &'v AssociatedItemKind)
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fn visit_defaultness(&mut self, defaultness: &'v Defaultness)
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fn visit_defaultness(&mut self, defaultness: &'v Defaultness)
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Auto Trait Implementations
impl<'a, 'tcx> !Send for RegionResolutionVisitor<'a, 'tcx>
impl<'a, 'tcx> !Send for RegionResolutionVisitor<'a, 'tcx>
impl<'a, 'tcx> !Sync for RegionResolutionVisitor<'a, 'tcx>
impl<'a, 'tcx> !Sync for RegionResolutionVisitor<'a, 'tcx>