Struct rustc_passes::liveness::Liveness
source · struct Liveness<'a, 'tcx> {
ir: &'a mut IrMaps<'tcx>,
typeck_results: &'a TypeckResults<'tcx>,
param_env: ParamEnv<'tcx>,
closure_min_captures: Option<&'tcx RootVariableMinCaptureList<'tcx>>,
successors: IndexVec<LiveNode, Option<LiveNode>>,
rwu_table: RWUTable,
closure_ln: LiveNode,
exit_ln: LiveNode,
break_ln: HirIdMap<LiveNode>,
cont_ln: HirIdMap<LiveNode>,
}
Fields§
§ir: &'a mut IrMaps<'tcx>
§typeck_results: &'a TypeckResults<'tcx>
§param_env: ParamEnv<'tcx>
§closure_min_captures: Option<&'tcx RootVariableMinCaptureList<'tcx>>
§successors: IndexVec<LiveNode, Option<LiveNode>>
§rwu_table: RWUTable
§closure_ln: LiveNode
A live node representing a point of execution before closure entry & after closure exit. Used to calculate liveness of captured variables through calls to the same closure. Used for Fn & FnMut closures only.
exit_ln: LiveNode
A live node representing every ‘exit’ from the function, whether it be by explicit return, panic, or other means.
break_ln: HirIdMap<LiveNode>
§cont_ln: HirIdMap<LiveNode>
Implementations§
source§impl<'a, 'tcx> Liveness<'a, 'tcx>
impl<'a, 'tcx> Liveness<'a, 'tcx>
fn new(ir: &'a mut IrMaps<'tcx>, body_owner: LocalDefId) -> Liveness<'a, 'tcx>
fn live_node(&self, hir_id: HirId, span: Span) -> LiveNode
fn variable(&self, hir_id: HirId, span: Span) -> Variable
fn define_bindings_in_pat(&mut self, pat: &Pat<'_>, succ: LiveNode) -> LiveNode
fn live_on_entry(&self, ln: LiveNode, var: Variable) -> bool
fn live_on_exit(&self, ln: LiveNode, var: Variable) -> bool
fn used_on_entry(&self, ln: LiveNode, var: Variable) -> bool
fn assigned_on_entry(&self, ln: LiveNode, var: Variable) -> bool
fn assigned_on_exit(&self, ln: LiveNode, var: Variable) -> bool
fn write_vars<F>(&self, wr: &mut dyn Write, test: F) -> Result<()>where F: FnMut(Variable) -> bool,
fn ln_str(&self, ln: LiveNode) -> String
fn log_liveness(&self, entry_ln: LiveNode, hir_id: HirId)
fn init_empty(&mut self, ln: LiveNode, succ_ln: LiveNode)
fn init_from_succ(&mut self, ln: LiveNode, succ_ln: LiveNode)
fn merge_from_succ(&mut self, ln: LiveNode, succ_ln: LiveNode) -> bool
fn define(&mut self, writer: LiveNode, var: Variable)
fn acc(&mut self, ln: LiveNode, var: Variable, acc: u32)
fn compute(&mut self, body: &Body<'_>, hir_id: HirId) -> LiveNode
fn propagate_through_block( &mut self, blk: &Block<'_>, succ: LiveNode ) -> LiveNode
fn propagate_through_stmt( &mut self, stmt: &Stmt<'_>, succ: LiveNode ) -> LiveNode
fn propagate_through_exprs( &mut self, exprs: &[Expr<'_>], succ: LiveNode ) -> LiveNode
fn propagate_through_opt_expr( &mut self, opt_expr: Option<&Expr<'_>>, succ: LiveNode ) -> LiveNode
fn propagate_through_expr( &mut self, expr: &Expr<'_>, succ: LiveNode ) -> LiveNode
fn propagate_through_place_components( &mut self, expr: &Expr<'_>, succ: LiveNode ) -> LiveNode
fn write_place(&mut self, expr: &Expr<'_>, succ: LiveNode, acc: u32) -> LiveNode
fn access_var( &mut self, hir_id: HirId, var_hid: HirId, succ: LiveNode, acc: u32, span: Span ) -> LiveNode
fn access_path( &mut self, hir_id: HirId, path: &Path<'_>, succ: LiveNode, acc: u32 ) -> LiveNode
fn propagate_through_loop( &mut self, expr: &Expr<'_>, body: &Block<'_>, succ: LiveNode ) -> LiveNode
fn check_is_ty_uninhabited( &mut self, expr: &Expr<'_>, succ: LiveNode ) -> LiveNode
fn warn_about_unreachable<'desc>( &mut self, orig_span: Span, orig_ty: Ty<'tcx>, expr_span: Span, expr_id: HirId, descr: &'desc str )
source§impl<'tcx> Liveness<'_, 'tcx>
impl<'tcx> Liveness<'_, 'tcx>
fn check_place(&mut self, expr: &'tcx Expr<'tcx>)
fn should_warn(&self, var: Variable) -> Option<String>
fn warn_about_unused_upvars(&self, entry_ln: LiveNode)
fn warn_about_unused_args(&self, body: &Body<'_>, entry_ln: LiveNode)
fn check_unused_vars_in_pat( &self, pat: &Pat<'_>, entry_ln: Option<LiveNode>, opt_body: Option<&Body<'_>>, on_used_on_entry: impl Fn(Vec<Span>, HirId, LiveNode, Variable) )
fn report_unused( &self, hir_ids_and_spans: Vec<(HirId, Span, Span)>, ln: LiveNode, var: Variable, can_remove: bool, pat: &Pat<'_>, opt_body: Option<&Body<'_>> )
fn string_interp_suggestions( &self, name: &str, opt_body: Option<&Body<'_>> ) -> Vec<UnusedVariableStringInterp>
fn warn_about_dead_assign( &self, spans: Vec<Span>, hir_id: HirId, ln: LiveNode, var: Variable )
Trait Implementations§
source§impl<'a, 'tcx> Visitor<'tcx> for Liveness<'a, 'tcx>
impl<'a, 'tcx> Visitor<'tcx> for Liveness<'a, 'tcx>
fn visit_local(&mut self, local: &'tcx Local<'tcx>)
fn visit_expr(&mut self, ex: &'tcx Expr<'tcx>)
fn visit_arm(&mut self, arm: &'tcx Arm<'tcx>)
type Map = <Self::NestedFilter as NestedFilter<'v>>::Map
§type NestedFilter = None
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
. Read moresource§fn nested_visit_map(&mut self) -> Self::Map
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.source§fn visit_nested_item(&mut self, id: ItemId)
fn visit_nested_item(&mut self, id: ItemId)
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.source§fn visit_nested_trait_item(&mut self, id: TraitItemId)
fn visit_nested_trait_item(&mut self, id: TraitItemId)
Like
visit_nested_item()
, but for trait items. See
visit_nested_item()
for advice on when to override this
method.source§fn visit_nested_impl_item(&mut self, id: ImplItemId)
fn visit_nested_impl_item(&mut self, id: ImplItemId)
Like
visit_nested_item()
, but for impl items. See
visit_nested_item()
for advice on when to override this
method.source§fn visit_nested_foreign_item(&mut self, id: ForeignItemId)
fn visit_nested_foreign_item(&mut self, id: ForeignItemId)
Like
visit_nested_item()
, but for foreign items. See
visit_nested_item()
for advice on when to override this
method.source§fn visit_nested_body(&mut self, id: BodyId)
fn visit_nested_body(&mut self, id: 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_param(&mut self, param: &'v Param<'v>)
source§fn visit_item(&mut self, i: &'v Item<'v>)
fn visit_item(&mut self, i: &'v Item<'v>)
Visits the top-level item and (optionally) nested items / impl items. See
visit_nested_item
for details.fn visit_body(&mut self, b: &'v Body<'v>)
fn visit_id(&mut self, _hir_id: HirId)
fn visit_name(&mut self, _name: Symbol)
fn visit_ident(&mut self, ident: Ident)
fn visit_mod(&mut self, m: &'v Mod<'v>, _s: Span, n: HirId)
fn visit_foreign_item(&mut self, i: &'v ForeignItem<'v>)
fn visit_block(&mut self, b: &'v Block<'v>)
fn visit_stmt(&mut self, s: &'v Stmt<'v>)
fn visit_pat(&mut self, p: &'v Pat<'v>)
fn visit_pat_field(&mut self, f: &'v PatField<'v>)
fn visit_array_length(&mut self, len: &'v ArrayLen)
fn visit_anon_const(&mut self, c: &'v AnonConst)
fn visit_inline_const(&mut self, c: &'v ConstBlock)
fn visit_let_expr(&mut self, lex: &'v Let<'v>)
fn visit_expr_field(&mut self, field: &'v ExprField<'v>)
fn visit_ty(&mut self, t: &'v Ty<'v>)
fn visit_generic_param(&mut self, p: &'v GenericParam<'v>)
fn visit_const_param_default(&mut self, _param: HirId, ct: &'v AnonConst)
fn visit_generics(&mut self, g: &'v Generics<'v>)
fn visit_where_predicate(&mut self, predicate: &'v WherePredicate<'v>)
fn visit_fn_ret_ty(&mut self, ret_ty: &'v FnRetTy<'v>)
fn visit_fn_decl(&mut self, fd: &'v FnDecl<'v>)
fn visit_fn( &mut self, fk: FnKind<'v>, fd: &'v FnDecl<'v>, b: BodyId, _: Span, id: LocalDefId )
fn visit_use( &mut self, path: &'v Path<'v, SmallVec<[Res<HirId>; 3]>>, hir_id: HirId )
fn visit_trait_item(&mut self, ti: &'v TraitItem<'v>)
fn visit_trait_item_ref(&mut self, ii: &'v TraitItemRef)
fn visit_impl_item(&mut self, ii: &'v ImplItem<'v>)
fn visit_foreign_item_ref(&mut self, ii: &'v ForeignItemRef)
fn visit_impl_item_ref(&mut self, ii: &'v ImplItemRef)
fn visit_trait_ref(&mut self, t: &'v TraitRef<'v>)
fn visit_param_bound(&mut self, bounds: &'v GenericBound<'v>)
fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef<'v>)
fn visit_variant_data(&mut self, s: &'v VariantData<'v>)
fn visit_field_def(&mut self, s: &'v FieldDef<'v>)
fn visit_enum_def(&mut self, enum_definition: &'v EnumDef<'v>, item_id: HirId)
fn visit_variant(&mut self, v: &'v Variant<'v>)
fn visit_label(&mut self, label: &'v Label)
fn visit_infer(&mut self, inf: &'v InferArg)
fn visit_generic_arg(&mut self, generic_arg: &'v GenericArg<'v>)
fn visit_lifetime(&mut self, lifetime: &'v Lifetime)
fn visit_qpath(&mut self, qpath: &'v QPath<'v>, id: HirId, _span: Span)
fn visit_path(&mut self, path: &Path<'v, Res<HirId>>, _id: HirId)
fn visit_path_segment(&mut self, path_segment: &'v PathSegment<'v>)
fn visit_generic_args(&mut self, generic_args: &'v GenericArgs<'v>)
fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding<'v>)
fn visit_attribute(&mut self, _attr: &'v Attribute)
fn visit_associated_item_kind(&mut self, kind: &'v AssocItemKind)
fn visit_defaultness(&mut self, defaultness: &'v Defaultness)
fn visit_inline_asm(&mut self, asm: &'v InlineAsm<'v>, id: HirId)
Auto Trait Implementations§
impl<'a, 'tcx> !RefUnwindSafe for Liveness<'a, 'tcx>
impl<'a, 'tcx> !Send for Liveness<'a, 'tcx>
impl<'a, 'tcx> !Sync for Liveness<'a, 'tcx>
impl<'a, 'tcx> Unpin for Liveness<'a, 'tcx>
impl<'a, 'tcx> !UnwindSafe for Liveness<'a, 'tcx>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
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: 224 bytes