| //! A `MutVisitor` represents an AST modification; it accepts an AST piece and |
| //! mutates it in place. So, for instance, macro expansion is a `MutVisitor` |
| //! that walks over an AST and modifies it. |
| //! |
| //! Note: using a `MutVisitor` (other than the `MacroExpander` `MutVisitor`) on |
| //! an AST before macro expansion is probably a bad idea. For instance, |
| //! a `MutVisitor` renaming item names in a module will miss all of those |
| //! that are created by the expansion of a macro. |
| |
| use std::ops::DerefMut; |
| use std::panic; |
| |
| use rustc_data_structures::flat_map_in_place::FlatMapInPlace; |
| use rustc_data_structures::stack::ensure_sufficient_stack; |
| use rustc_span::{Ident, Span}; |
| use smallvec::{Array, SmallVec, smallvec}; |
| use thin_vec::ThinVec; |
| |
| use crate::ast::*; |
| use crate::ptr::P; |
| use crate::tokenstream::*; |
| use crate::visit::{AssocCtxt, BoundKind, FnCtxt, try_visit, visit_opt, walk_list}; |
| |
| pub trait ExpectOne<A: Array> { |
| fn expect_one(self, err: &'static str) -> A::Item; |
| } |
| |
| impl<A: Array> ExpectOne<A> for SmallVec<A> { |
| fn expect_one(self, err: &'static str) -> A::Item { |
| assert!(self.len() == 1, "{}", err); |
| self.into_iter().next().unwrap() |
| } |
| } |
| |
| pub trait MutVisitor: Sized { |
| // Methods in this trait have one of three forms: |
| // |
| // fn visit_t(&mut self, t: &mut T); // common |
| // fn flat_map_t(&mut self, t: T) -> SmallVec<[T; 1]>; // rare |
| // fn filter_map_t(&mut self, t: T) -> Option<T>; // rarest |
| // |
| // When writing these methods, it is better to use destructuring like this: |
| // |
| // fn visit_abc(&mut self, ABC { a, b, c: _ }: &mut ABC) { |
| // visit_a(a); |
| // visit_b(b); |
| // } |
| // |
| // than to use field access like this: |
| // |
| // fn visit_abc(&mut self, abc: &mut ABC) { |
| // visit_a(&mut abc.a); |
| // visit_b(&mut abc.b); |
| // // ignore abc.c |
| // } |
| // |
| // As well as being more concise, the former is explicit about which fields |
| // are skipped. Furthermore, if a new field is added, the destructuring |
| // version will cause a compile error, which is good. In comparison, the |
| // field access version will continue working and it would be easy to |
| // forget to add handling for it. |
| |
| fn visit_crate(&mut self, c: &mut Crate) { |
| walk_crate(self, c) |
| } |
| |
| fn visit_meta_list_item(&mut self, list_item: &mut MetaItemInner) { |
| walk_meta_list_item(self, list_item); |
| } |
| |
| fn visit_meta_item(&mut self, meta_item: &mut MetaItem) { |
| walk_meta_item(self, meta_item); |
| } |
| |
| fn visit_use_tree(&mut self, use_tree: &mut UseTree) { |
| walk_use_tree(self, use_tree); |
| } |
| |
| fn visit_foreign_item(&mut self, ni: &mut ForeignItem) { |
| walk_item(self, ni); |
| } |
| |
| fn flat_map_foreign_item(&mut self, ni: P<ForeignItem>) -> SmallVec<[P<ForeignItem>; 1]> { |
| walk_flat_map_foreign_item(self, ni) |
| } |
| |
| fn visit_item(&mut self, i: &mut Item) { |
| walk_item(self, i); |
| } |
| |
| fn flat_map_item(&mut self, i: P<Item>) -> SmallVec<[P<Item>; 1]> { |
| walk_flat_map_item(self, i) |
| } |
| |
| fn visit_fn_header(&mut self, header: &mut FnHeader) { |
| walk_fn_header(self, header); |
| } |
| |
| fn visit_field_def(&mut self, fd: &mut FieldDef) { |
| walk_field_def(self, fd); |
| } |
| |
| fn flat_map_field_def(&mut self, fd: FieldDef) -> SmallVec<[FieldDef; 1]> { |
| walk_flat_map_field_def(self, fd) |
| } |
| |
| fn visit_assoc_item(&mut self, i: &mut AssocItem, ctxt: AssocCtxt) { |
| walk_assoc_item(self, i, ctxt) |
| } |
| |
| fn flat_map_assoc_item( |
| &mut self, |
| i: P<AssocItem>, |
| ctxt: AssocCtxt, |
| ) -> SmallVec<[P<AssocItem>; 1]> { |
| walk_flat_map_assoc_item(self, i, ctxt) |
| } |
| |
| fn visit_contract(&mut self, c: &mut FnContract) { |
| walk_contract(self, c); |
| } |
| |
| fn visit_fn_decl(&mut self, d: &mut FnDecl) { |
| walk_fn_decl(self, d); |
| } |
| |
| /// `Span` and `NodeId` are mutated at the caller site. |
| fn visit_fn(&mut self, fk: FnKind<'_>, _: Span, _: NodeId) { |
| walk_fn(self, fk) |
| } |
| |
| fn visit_coroutine_kind(&mut self, a: &mut CoroutineKind) { |
| walk_coroutine_kind(self, a); |
| } |
| |
| fn visit_closure_binder(&mut self, b: &mut ClosureBinder) { |
| walk_closure_binder(self, b); |
| } |
| |
| fn visit_block(&mut self, b: &mut Block) { |
| walk_block(self, b); |
| } |
| |
| fn flat_map_stmt(&mut self, s: Stmt) -> SmallVec<[Stmt; 1]> { |
| walk_flat_map_stmt(self, s) |
| } |
| |
| fn visit_arm(&mut self, arm: &mut Arm) { |
| walk_arm(self, arm); |
| } |
| |
| fn flat_map_arm(&mut self, arm: Arm) -> SmallVec<[Arm; 1]> { |
| walk_flat_map_arm(self, arm) |
| } |
| |
| fn visit_pat(&mut self, p: &mut P<Pat>) { |
| walk_pat(self, p); |
| } |
| |
| fn visit_anon_const(&mut self, c: &mut AnonConst) { |
| walk_anon_const(self, c); |
| } |
| |
| fn visit_expr(&mut self, e: &mut P<Expr>) { |
| walk_expr(self, e); |
| } |
| |
| /// This method is a hack to workaround unstable of `stmt_expr_attributes`. |
| /// It can be removed once that feature is stabilized. |
| fn visit_method_receiver_expr(&mut self, ex: &mut P<Expr>) { |
| self.visit_expr(ex) |
| } |
| |
| fn filter_map_expr(&mut self, e: P<Expr>) -> Option<P<Expr>> { |
| walk_filter_map_expr(self, e) |
| } |
| |
| fn visit_generic_arg(&mut self, arg: &mut GenericArg) { |
| walk_generic_arg(self, arg); |
| } |
| |
| fn visit_ty(&mut self, t: &mut P<Ty>) { |
| walk_ty(self, t); |
| } |
| |
| fn visit_ty_pat(&mut self, t: &mut TyPat) { |
| walk_ty_pat(self, t); |
| } |
| |
| fn visit_lifetime(&mut self, l: &mut Lifetime) { |
| walk_lifetime(self, l); |
| } |
| |
| fn visit_assoc_item_constraint(&mut self, c: &mut AssocItemConstraint) { |
| walk_assoc_item_constraint(self, c); |
| } |
| |
| fn visit_foreign_mod(&mut self, nm: &mut ForeignMod) { |
| walk_foreign_mod(self, nm); |
| } |
| |
| fn visit_variant(&mut self, v: &mut Variant) { |
| walk_variant(self, v); |
| } |
| |
| fn flat_map_variant(&mut self, v: Variant) -> SmallVec<[Variant; 1]> { |
| walk_flat_map_variant(self, v) |
| } |
| |
| fn visit_ident(&mut self, i: &mut Ident) { |
| walk_ident(self, i); |
| } |
| |
| fn visit_modifiers(&mut self, m: &mut TraitBoundModifiers) { |
| walk_modifiers(self, m); |
| } |
| |
| fn visit_path(&mut self, p: &mut Path) { |
| walk_path(self, p); |
| } |
| |
| fn visit_path_segment(&mut self, p: &mut PathSegment) { |
| walk_path_segment(self, p) |
| } |
| |
| fn visit_qself(&mut self, qs: &mut Option<P<QSelf>>) { |
| walk_qself(self, qs); |
| } |
| |
| fn visit_generic_args(&mut self, p: &mut GenericArgs) { |
| walk_generic_args(self, p); |
| } |
| |
| fn visit_angle_bracketed_parameter_data(&mut self, p: &mut AngleBracketedArgs) { |
| walk_angle_bracketed_parameter_data(self, p); |
| } |
| |
| fn visit_parenthesized_parameter_data(&mut self, p: &mut ParenthesizedArgs) { |
| walk_parenthesized_parameter_data(self, p); |
| } |
| |
| fn visit_local(&mut self, l: &mut Local) { |
| walk_local(self, l); |
| } |
| |
| fn visit_mac_call(&mut self, mac: &mut MacCall) { |
| walk_mac(self, mac); |
| } |
| |
| fn visit_macro_def(&mut self, def: &mut MacroDef) { |
| walk_macro_def(self, def); |
| } |
| |
| fn visit_label(&mut self, label: &mut Label) { |
| walk_label(self, label); |
| } |
| |
| fn visit_attribute(&mut self, at: &mut Attribute) { |
| walk_attribute(self, at); |
| } |
| |
| fn visit_param(&mut self, param: &mut Param) { |
| walk_param(self, param); |
| } |
| |
| fn flat_map_param(&mut self, param: Param) -> SmallVec<[Param; 1]> { |
| walk_flat_map_param(self, param) |
| } |
| |
| fn visit_generics(&mut self, generics: &mut Generics) { |
| walk_generics(self, generics); |
| } |
| |
| fn visit_trait_ref(&mut self, tr: &mut TraitRef) { |
| walk_trait_ref(self, tr); |
| } |
| |
| fn visit_poly_trait_ref(&mut self, p: &mut PolyTraitRef) { |
| walk_poly_trait_ref(self, p); |
| } |
| |
| fn visit_variant_data(&mut self, vdata: &mut VariantData) { |
| walk_variant_data(self, vdata); |
| } |
| |
| fn visit_generic_param(&mut self, param: &mut GenericParam) { |
| walk_generic_param(self, param) |
| } |
| |
| fn flat_map_generic_param(&mut self, param: GenericParam) -> SmallVec<[GenericParam; 1]> { |
| walk_flat_map_generic_param(self, param) |
| } |
| |
| fn visit_param_bound(&mut self, tpb: &mut GenericBound, _ctxt: BoundKind) { |
| walk_param_bound(self, tpb); |
| } |
| |
| fn visit_precise_capturing_arg(&mut self, arg: &mut PreciseCapturingArg) { |
| walk_precise_capturing_arg(self, arg); |
| } |
| |
| fn visit_expr_field(&mut self, f: &mut ExprField) { |
| walk_expr_field(self, f); |
| } |
| |
| fn flat_map_expr_field(&mut self, f: ExprField) -> SmallVec<[ExprField; 1]> { |
| walk_flat_map_expr_field(self, f) |
| } |
| |
| fn visit_where_clause(&mut self, where_clause: &mut WhereClause) { |
| walk_where_clause(self, where_clause); |
| } |
| |
| fn flat_map_where_predicate( |
| &mut self, |
| where_predicate: WherePredicate, |
| ) -> SmallVec<[WherePredicate; 1]> { |
| walk_flat_map_where_predicate(self, where_predicate) |
| } |
| |
| fn visit_where_predicate_kind(&mut self, kind: &mut WherePredicateKind) { |
| walk_where_predicate_kind(self, kind) |
| } |
| |
| fn visit_vis(&mut self, vis: &mut Visibility) { |
| walk_vis(self, vis); |
| } |
| |
| fn visit_id(&mut self, _id: &mut NodeId) { |
| // Do nothing. |
| } |
| |
| // Span visiting is no longer used, but we keep it for now, |
| // in case it's needed for something like #127241. |
| fn visit_span(&mut self, _sp: &mut Span) { |
| // Do nothing. |
| } |
| |
| fn visit_pat_field(&mut self, fp: &mut PatField) { |
| walk_pat_field(self, fp) |
| } |
| |
| fn flat_map_pat_field(&mut self, fp: PatField) -> SmallVec<[PatField; 1]> { |
| walk_flat_map_pat_field(self, fp) |
| } |
| |
| fn visit_inline_asm(&mut self, asm: &mut InlineAsm) { |
| walk_inline_asm(self, asm) |
| } |
| |
| fn visit_inline_asm_sym(&mut self, sym: &mut InlineAsmSym) { |
| walk_inline_asm_sym(self, sym) |
| } |
| |
| fn visit_format_args(&mut self, fmt: &mut FormatArgs) { |
| walk_format_args(self, fmt) |
| } |
| |
| fn visit_capture_by(&mut self, capture_by: &mut CaptureBy) { |
| walk_capture_by(self, capture_by) |
| } |
| |
| fn visit_fn_ret_ty(&mut self, fn_ret_ty: &mut FnRetTy) { |
| walk_fn_ret_ty(self, fn_ret_ty) |
| } |
| } |
| |
| super::common_visitor_and_walkers!((mut) MutVisitor); |
| |
| #[inline] |
| fn visit_vec<T, F>(elems: &mut Vec<T>, mut visit_elem: F) |
| where |
| F: FnMut(&mut T), |
| { |
| for elem in elems { |
| visit_elem(elem); |
| } |
| } |
| |
| #[inline] |
| fn visit_thin_vec<T, F>(elems: &mut ThinVec<T>, mut visit_elem: F) |
| where |
| F: FnMut(&mut T), |
| { |
| for elem in elems { |
| visit_elem(elem); |
| } |
| } |
| |
| #[inline] |
| fn visit_opt<T, F>(opt: &mut Option<T>, mut visit_elem: F) |
| where |
| F: FnMut(&mut T), |
| { |
| if let Some(elem) = opt { |
| visit_elem(elem); |
| } |
| } |
| |
| fn visit_attrs<T: MutVisitor>(vis: &mut T, attrs: &mut AttrVec) { |
| for attr in attrs.iter_mut() { |
| vis.visit_attribute(attr); |
| } |
| } |
| |
| #[allow(unused)] |
| fn visit_exprs<T: MutVisitor>(vis: &mut T, exprs: &mut Vec<P<Expr>>) { |
| exprs.flat_map_in_place(|expr| vis.filter_map_expr(expr)) |
| } |
| |
| fn visit_thin_exprs<T: MutVisitor>(vis: &mut T, exprs: &mut ThinVec<P<Expr>>) { |
| exprs.flat_map_in_place(|expr| vis.filter_map_expr(expr)) |
| } |
| |
| fn visit_attr_args<T: MutVisitor>(vis: &mut T, args: &mut AttrArgs) { |
| match args { |
| AttrArgs::Empty => {} |
| AttrArgs::Delimited(args) => visit_delim_args(vis, args), |
| AttrArgs::Eq { eq_span, expr } => { |
| vis.visit_expr(expr); |
| vis.visit_span(eq_span); |
| } |
| } |
| } |
| |
| fn visit_delim_args<T: MutVisitor>(vis: &mut T, args: &mut DelimArgs) { |
| let DelimArgs { dspan, delim: _, tokens: _ } = args; |
| let DelimSpan { open, close } = dspan; |
| vis.visit_span(open); |
| vis.visit_span(close); |
| } |
| |
| pub fn walk_pat_field<T: MutVisitor>(vis: &mut T, fp: &mut PatField) { |
| let PatField { attrs, id, ident, is_placeholder: _, is_shorthand: _, pat, span } = fp; |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| vis.visit_ident(ident); |
| vis.visit_pat(pat); |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_flat_map_pat_field<T: MutVisitor>( |
| vis: &mut T, |
| mut fp: PatField, |
| ) -> SmallVec<[PatField; 1]> { |
| vis.visit_pat_field(&mut fp); |
| smallvec![fp] |
| } |
| |
| fn walk_use_tree<T: MutVisitor>(vis: &mut T, use_tree: &mut UseTree) { |
| let UseTree { prefix, kind, span } = use_tree; |
| vis.visit_path(prefix); |
| match kind { |
| UseTreeKind::Simple(rename) => visit_opt(rename, |rename| vis.visit_ident(rename)), |
| UseTreeKind::Nested { items, span } => { |
| for (tree, id) in items { |
| vis.visit_id(id); |
| vis.visit_use_tree(tree); |
| } |
| vis.visit_span(span); |
| } |
| UseTreeKind::Glob => {} |
| } |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_arm<T: MutVisitor>(vis: &mut T, arm: &mut Arm) { |
| let Arm { attrs, pat, guard, body, span, id, is_placeholder: _ } = arm; |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| vis.visit_pat(pat); |
| visit_opt(guard, |guard| vis.visit_expr(guard)); |
| visit_opt(body, |body| vis.visit_expr(body)); |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_flat_map_arm<T: MutVisitor>(vis: &mut T, mut arm: Arm) -> SmallVec<[Arm; 1]> { |
| vis.visit_arm(&mut arm); |
| smallvec![arm] |
| } |
| |
| fn walk_assoc_item_constraint<T: MutVisitor>( |
| vis: &mut T, |
| AssocItemConstraint { id, ident, gen_args, kind, span }: &mut AssocItemConstraint, |
| ) { |
| vis.visit_id(id); |
| vis.visit_ident(ident); |
| if let Some(gen_args) = gen_args { |
| vis.visit_generic_args(gen_args); |
| } |
| match kind { |
| AssocItemConstraintKind::Equality { term } => match term { |
| Term::Ty(ty) => vis.visit_ty(ty), |
| Term::Const(c) => vis.visit_anon_const(c), |
| }, |
| AssocItemConstraintKind::Bound { bounds } => visit_bounds(vis, bounds, BoundKind::Bound), |
| } |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_ty_pat<T: MutVisitor>(vis: &mut T, ty: &mut TyPat) { |
| let TyPat { id, kind, span, tokens: _ } = ty; |
| vis.visit_id(id); |
| match kind { |
| TyPatKind::Range(start, end, _include_end) => { |
| visit_opt(start, |c| vis.visit_anon_const(c)); |
| visit_opt(end, |c| vis.visit_anon_const(c)); |
| } |
| TyPatKind::Or(variants) => visit_thin_vec(variants, |p| vis.visit_ty_pat(p)), |
| TyPatKind::Err(_) => {} |
| } |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_variant<T: MutVisitor>(visitor: &mut T, variant: &mut Variant) { |
| let Variant { ident, vis, attrs, id, data, disr_expr, span, is_placeholder: _ } = variant; |
| visitor.visit_id(id); |
| visit_attrs(visitor, attrs); |
| visitor.visit_vis(vis); |
| visitor.visit_ident(ident); |
| visitor.visit_variant_data(data); |
| visit_opt(disr_expr, |disr_expr| visitor.visit_anon_const(disr_expr)); |
| visitor.visit_span(span); |
| } |
| |
| pub fn walk_flat_map_variant<T: MutVisitor>( |
| vis: &mut T, |
| mut variant: Variant, |
| ) -> SmallVec<[Variant; 1]> { |
| vis.visit_variant(&mut variant); |
| smallvec![variant] |
| } |
| |
| fn walk_ident<T: MutVisitor>(vis: &mut T, Ident { name: _, span }: &mut Ident) { |
| vis.visit_span(span); |
| } |
| |
| fn walk_path<T: MutVisitor>(vis: &mut T, Path { segments, span, tokens: _ }: &mut Path) { |
| for segment in segments { |
| vis.visit_path_segment(segment); |
| } |
| vis.visit_span(span); |
| } |
| |
| fn walk_qself<T: MutVisitor>(vis: &mut T, qself: &mut Option<P<QSelf>>) { |
| visit_opt(qself, |qself| { |
| let QSelf { ty, path_span, position: _ } = &mut **qself; |
| vis.visit_ty(ty); |
| vis.visit_span(path_span); |
| }) |
| } |
| |
| fn walk_generic_args<T: MutVisitor>(vis: &mut T, generic_args: &mut GenericArgs) { |
| match generic_args { |
| GenericArgs::AngleBracketed(data) => vis.visit_angle_bracketed_parameter_data(data), |
| GenericArgs::Parenthesized(data) => vis.visit_parenthesized_parameter_data(data), |
| GenericArgs::ParenthesizedElided(span) => vis.visit_span(span), |
| } |
| } |
| |
| fn walk_generic_arg<T: MutVisitor>(vis: &mut T, arg: &mut GenericArg) { |
| match arg { |
| GenericArg::Lifetime(lt) => vis.visit_lifetime(lt), |
| GenericArg::Type(ty) => vis.visit_ty(ty), |
| GenericArg::Const(ct) => vis.visit_anon_const(ct), |
| } |
| } |
| |
| fn walk_angle_bracketed_parameter_data<T: MutVisitor>(vis: &mut T, data: &mut AngleBracketedArgs) { |
| let AngleBracketedArgs { args, span } = data; |
| visit_thin_vec(args, |arg| match arg { |
| AngleBracketedArg::Arg(arg) => vis.visit_generic_arg(arg), |
| AngleBracketedArg::Constraint(constraint) => vis.visit_assoc_item_constraint(constraint), |
| }); |
| vis.visit_span(span); |
| } |
| |
| fn walk_parenthesized_parameter_data<T: MutVisitor>(vis: &mut T, args: &mut ParenthesizedArgs) { |
| let ParenthesizedArgs { inputs, output, span, inputs_span } = args; |
| visit_thin_vec(inputs, |input| vis.visit_ty(input)); |
| vis.visit_fn_ret_ty(output); |
| vis.visit_span(span); |
| vis.visit_span(inputs_span); |
| } |
| |
| fn walk_local<T: MutVisitor>(vis: &mut T, local: &mut Local) { |
| let Local { id, super_, pat, ty, kind, span, colon_sp, attrs, tokens: _ } = local; |
| visit_opt(super_, |sp| vis.visit_span(sp)); |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| vis.visit_pat(pat); |
| visit_opt(ty, |ty| vis.visit_ty(ty)); |
| match kind { |
| LocalKind::Decl => {} |
| LocalKind::Init(init) => { |
| vis.visit_expr(init); |
| } |
| LocalKind::InitElse(init, els) => { |
| vis.visit_expr(init); |
| vis.visit_block(els); |
| } |
| } |
| visit_opt(colon_sp, |sp| vis.visit_span(sp)); |
| vis.visit_span(span); |
| } |
| |
| fn walk_attribute<T: MutVisitor>(vis: &mut T, attr: &mut Attribute) { |
| let Attribute { kind, id: _, style: _, span } = attr; |
| match kind { |
| AttrKind::Normal(normal) => { |
| let NormalAttr { item: AttrItem { unsafety: _, path, args, tokens: _ }, tokens: _ } = |
| &mut **normal; |
| vis.visit_path(path); |
| visit_attr_args(vis, args); |
| } |
| AttrKind::DocComment(_kind, _sym) => {} |
| } |
| vis.visit_span(span); |
| } |
| |
| fn walk_mac<T: MutVisitor>(vis: &mut T, mac: &mut MacCall) { |
| let MacCall { path, args } = mac; |
| vis.visit_path(path); |
| visit_delim_args(vis, args); |
| } |
| |
| fn walk_macro_def<T: MutVisitor>(vis: &mut T, macro_def: &mut MacroDef) { |
| let MacroDef { body, macro_rules: _ } = macro_def; |
| visit_delim_args(vis, body); |
| } |
| |
| fn walk_meta_list_item<T: MutVisitor>(vis: &mut T, li: &mut MetaItemInner) { |
| match li { |
| MetaItemInner::MetaItem(mi) => vis.visit_meta_item(mi), |
| MetaItemInner::Lit(_lit) => {} |
| } |
| } |
| |
| fn walk_meta_item<T: MutVisitor>(vis: &mut T, mi: &mut MetaItem) { |
| let MetaItem { unsafety: _, path: _, kind, span } = mi; |
| match kind { |
| MetaItemKind::Word => {} |
| MetaItemKind::List(mis) => visit_thin_vec(mis, |mi| vis.visit_meta_list_item(mi)), |
| MetaItemKind::NameValue(_s) => {} |
| } |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_param<T: MutVisitor>(vis: &mut T, param: &mut Param) { |
| let Param { attrs, id, pat, span, ty, is_placeholder: _ } = param; |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| vis.visit_pat(pat); |
| vis.visit_ty(ty); |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_flat_map_param<T: MutVisitor>(vis: &mut T, mut param: Param) -> SmallVec<[Param; 1]> { |
| vis.visit_param(&mut param); |
| smallvec![param] |
| } |
| |
| fn walk_closure_binder<T: MutVisitor>(vis: &mut T, binder: &mut ClosureBinder) { |
| match binder { |
| ClosureBinder::NotPresent => {} |
| ClosureBinder::For { span: _, generic_params } => { |
| generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param)); |
| } |
| } |
| } |
| |
| fn walk_fn<T: MutVisitor>(vis: &mut T, kind: FnKind<'_>) { |
| match kind { |
| FnKind::Fn( |
| _ctxt, |
| _vis, |
| Fn { |
| defaultness, |
| ident, |
| generics, |
| contract, |
| body, |
| sig: FnSig { header, decl, span }, |
| define_opaque, |
| }, |
| ) => { |
| // Visibility is visited as a part of the item. |
| visit_defaultness(vis, defaultness); |
| vis.visit_ident(ident); |
| vis.visit_fn_header(header); |
| vis.visit_generics(generics); |
| vis.visit_fn_decl(decl); |
| if let Some(contract) = contract { |
| vis.visit_contract(contract); |
| } |
| if let Some(body) = body { |
| vis.visit_block(body); |
| } |
| vis.visit_span(span); |
| |
| walk_define_opaques(vis, define_opaque); |
| } |
| FnKind::Closure(binder, coroutine_kind, decl, body) => { |
| vis.visit_closure_binder(binder); |
| coroutine_kind.as_mut().map(|coroutine_kind| vis.visit_coroutine_kind(coroutine_kind)); |
| vis.visit_fn_decl(decl); |
| vis.visit_expr(body); |
| } |
| } |
| } |
| |
| fn walk_contract<T: MutVisitor>(vis: &mut T, contract: &mut FnContract) { |
| let FnContract { requires, ensures } = contract; |
| if let Some(pred) = requires { |
| vis.visit_expr(pred); |
| } |
| if let Some(pred) = ensures { |
| vis.visit_expr(pred); |
| } |
| } |
| |
| fn walk_fn_decl<T: MutVisitor>(vis: &mut T, decl: &mut FnDecl) { |
| let FnDecl { inputs, output } = decl; |
| inputs.flat_map_in_place(|param| vis.flat_map_param(param)); |
| vis.visit_fn_ret_ty(output); |
| } |
| |
| fn walk_fn_ret_ty<T: MutVisitor>(vis: &mut T, fn_ret_ty: &mut FnRetTy) { |
| match fn_ret_ty { |
| FnRetTy::Default(span) => vis.visit_span(span), |
| FnRetTy::Ty(ty) => vis.visit_ty(ty), |
| } |
| } |
| |
| fn walk_param_bound<T: MutVisitor>(vis: &mut T, pb: &mut GenericBound) { |
| match pb { |
| GenericBound::Trait(trait_ref) => vis.visit_poly_trait_ref(trait_ref), |
| GenericBound::Outlives(lifetime) => walk_lifetime(vis, lifetime), |
| GenericBound::Use(args, span) => { |
| for arg in args { |
| vis.visit_precise_capturing_arg(arg); |
| } |
| vis.visit_span(span); |
| } |
| } |
| } |
| |
| fn walk_precise_capturing_arg<T: MutVisitor>(vis: &mut T, arg: &mut PreciseCapturingArg) { |
| match arg { |
| PreciseCapturingArg::Lifetime(lt) => { |
| vis.visit_lifetime(lt); |
| } |
| PreciseCapturingArg::Arg(path, id) => { |
| vis.visit_id(id); |
| vis.visit_path(path); |
| } |
| } |
| } |
| |
| pub fn walk_generic_param<T: MutVisitor>(vis: &mut T, param: &mut GenericParam) { |
| let GenericParam { id, ident, attrs, bounds, kind, colon_span, is_placeholder: _ } = param; |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| vis.visit_ident(ident); |
| visit_vec(bounds, |bound| vis.visit_param_bound(bound, BoundKind::Bound)); |
| match kind { |
| GenericParamKind::Lifetime => {} |
| GenericParamKind::Type { default } => { |
| visit_opt(default, |default| vis.visit_ty(default)); |
| } |
| GenericParamKind::Const { ty, kw_span: _, default } => { |
| vis.visit_ty(ty); |
| visit_opt(default, |default| vis.visit_anon_const(default)); |
| } |
| } |
| if let Some(colon_span) = colon_span { |
| vis.visit_span(colon_span); |
| } |
| } |
| |
| pub fn walk_flat_map_generic_param<T: MutVisitor>( |
| vis: &mut T, |
| mut param: GenericParam, |
| ) -> SmallVec<[GenericParam; 1]> { |
| vis.visit_generic_param(&mut param); |
| smallvec![param] |
| } |
| |
| fn walk_generics<T: MutVisitor>(vis: &mut T, generics: &mut Generics) { |
| let Generics { params, where_clause, span } = generics; |
| params.flat_map_in_place(|param| vis.flat_map_generic_param(param)); |
| vis.visit_where_clause(where_clause); |
| vis.visit_span(span); |
| } |
| |
| fn walk_ty_alias_where_clauses<T: MutVisitor>(vis: &mut T, tawcs: &mut TyAliasWhereClauses) { |
| let TyAliasWhereClauses { before, after, split: _ } = tawcs; |
| let TyAliasWhereClause { has_where_token: _, span: span_before } = before; |
| let TyAliasWhereClause { has_where_token: _, span: span_after } = after; |
| vis.visit_span(span_before); |
| vis.visit_span(span_after); |
| } |
| |
| fn walk_where_clause<T: MutVisitor>(vis: &mut T, wc: &mut WhereClause) { |
| let WhereClause { has_where_token: _, predicates, span } = wc; |
| predicates.flat_map_in_place(|predicate| vis.flat_map_where_predicate(predicate)); |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_flat_map_where_predicate<T: MutVisitor>( |
| vis: &mut T, |
| mut pred: WherePredicate, |
| ) -> SmallVec<[WherePredicate; 1]> { |
| let WherePredicate { attrs, kind, id, span, is_placeholder: _ } = &mut pred; |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| vis.visit_where_predicate_kind(kind); |
| vis.visit_span(span); |
| smallvec![pred] |
| } |
| |
| pub fn walk_where_predicate_kind<T: MutVisitor>(vis: &mut T, kind: &mut WherePredicateKind) { |
| match kind { |
| WherePredicateKind::BoundPredicate(bp) => { |
| let WhereBoundPredicate { bound_generic_params, bounded_ty, bounds } = bp; |
| bound_generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param)); |
| vis.visit_ty(bounded_ty); |
| visit_vec(bounds, |bound| vis.visit_param_bound(bound, BoundKind::Bound)); |
| } |
| WherePredicateKind::RegionPredicate(rp) => { |
| let WhereRegionPredicate { lifetime, bounds } = rp; |
| vis.visit_lifetime(lifetime); |
| visit_vec(bounds, |bound| vis.visit_param_bound(bound, BoundKind::Bound)); |
| } |
| WherePredicateKind::EqPredicate(ep) => { |
| let WhereEqPredicate { lhs_ty, rhs_ty } = ep; |
| vis.visit_ty(lhs_ty); |
| vis.visit_ty(rhs_ty); |
| } |
| } |
| } |
| |
| fn walk_variant_data<T: MutVisitor>(vis: &mut T, vdata: &mut VariantData) { |
| match vdata { |
| VariantData::Struct { fields, recovered: _ } => { |
| fields.flat_map_in_place(|field| vis.flat_map_field_def(field)); |
| } |
| VariantData::Tuple(fields, id) => { |
| vis.visit_id(id); |
| fields.flat_map_in_place(|field| vis.flat_map_field_def(field)); |
| } |
| VariantData::Unit(id) => vis.visit_id(id), |
| } |
| } |
| |
| fn walk_trait_ref<T: MutVisitor>(vis: &mut T, TraitRef { path, ref_id }: &mut TraitRef) { |
| vis.visit_id(ref_id); |
| vis.visit_path(path); |
| } |
| |
| fn walk_poly_trait_ref<T: MutVisitor>(vis: &mut T, p: &mut PolyTraitRef) { |
| let PolyTraitRef { bound_generic_params, modifiers, trait_ref, span } = p; |
| vis.visit_modifiers(modifiers); |
| bound_generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param)); |
| vis.visit_trait_ref(trait_ref); |
| vis.visit_span(span); |
| } |
| |
| fn walk_modifiers<V: MutVisitor>(vis: &mut V, m: &mut TraitBoundModifiers) { |
| let TraitBoundModifiers { constness, asyncness, polarity } = m; |
| match constness { |
| BoundConstness::Never => {} |
| BoundConstness::Always(span) | BoundConstness::Maybe(span) => vis.visit_span(span), |
| } |
| match asyncness { |
| BoundAsyncness::Normal => {} |
| BoundAsyncness::Async(span) => vis.visit_span(span), |
| } |
| match polarity { |
| BoundPolarity::Positive => {} |
| BoundPolarity::Negative(span) | BoundPolarity::Maybe(span) => vis.visit_span(span), |
| } |
| } |
| |
| pub fn walk_field_def<T: MutVisitor>(visitor: &mut T, fd: &mut FieldDef) { |
| let FieldDef { span, ident, vis, id, ty, attrs, is_placeholder: _, safety, default } = fd; |
| visitor.visit_id(id); |
| visit_attrs(visitor, attrs); |
| visitor.visit_vis(vis); |
| visit_safety(visitor, safety); |
| visit_opt(ident, |ident| visitor.visit_ident(ident)); |
| visitor.visit_ty(ty); |
| visit_opt(default, |default| visitor.visit_anon_const(default)); |
| visitor.visit_span(span); |
| } |
| |
| pub fn walk_flat_map_field_def<T: MutVisitor>( |
| vis: &mut T, |
| mut fd: FieldDef, |
| ) -> SmallVec<[FieldDef; 1]> { |
| vis.visit_field_def(&mut fd); |
| smallvec![fd] |
| } |
| |
| pub fn walk_expr_field<T: MutVisitor>(vis: &mut T, f: &mut ExprField) { |
| let ExprField { ident, expr, span, is_shorthand: _, attrs, id, is_placeholder: _ } = f; |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| vis.visit_ident(ident); |
| vis.visit_expr(expr); |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_flat_map_expr_field<T: MutVisitor>( |
| vis: &mut T, |
| mut f: ExprField, |
| ) -> SmallVec<[ExprField; 1]> { |
| vis.visit_expr_field(&mut f); |
| smallvec![f] |
| } |
| |
| pub fn walk_item_kind<K: WalkItemKind>( |
| kind: &mut K, |
| span: Span, |
| id: NodeId, |
| visibility: &mut Visibility, |
| ctxt: K::Ctxt, |
| vis: &mut impl MutVisitor, |
| ) { |
| kind.walk(span, id, visibility, ctxt, vis) |
| } |
| |
| pub fn walk_crate<T: MutVisitor>(vis: &mut T, krate: &mut Crate) { |
| let Crate { attrs, items, spans, id, is_placeholder: _ } = krate; |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| items.flat_map_in_place(|item| vis.flat_map_item(item)); |
| let ModSpans { inner_span, inject_use_span } = spans; |
| vis.visit_span(inner_span); |
| vis.visit_span(inject_use_span); |
| } |
| |
| pub fn walk_flat_map_item(vis: &mut impl MutVisitor, mut item: P<Item>) -> SmallVec<[P<Item>; 1]> { |
| vis.visit_item(&mut item); |
| smallvec![item] |
| } |
| |
| pub fn walk_flat_map_foreign_item( |
| vis: &mut impl MutVisitor, |
| mut item: P<ForeignItem>, |
| ) -> SmallVec<[P<ForeignItem>; 1]> { |
| vis.visit_foreign_item(&mut item); |
| smallvec![item] |
| } |
| |
| pub fn walk_flat_map_assoc_item( |
| vis: &mut impl MutVisitor, |
| mut item: P<AssocItem>, |
| ctxt: AssocCtxt, |
| ) -> SmallVec<[P<AssocItem>; 1]> { |
| vis.visit_assoc_item(&mut item, ctxt); |
| smallvec![item] |
| } |
| |
| fn walk_inline_asm<T: MutVisitor>(vis: &mut T, asm: &mut InlineAsm) { |
| // FIXME: Visit spans inside all this currently ignored stuff. |
| let InlineAsm { |
| asm_macro: _, |
| template: _, |
| template_strs: _, |
| operands, |
| clobber_abis: _, |
| options: _, |
| line_spans: _, |
| } = asm; |
| for (op, span) in operands { |
| match op { |
| InlineAsmOperand::In { expr, reg: _ } |
| | InlineAsmOperand::Out { expr: Some(expr), reg: _, late: _ } |
| | InlineAsmOperand::InOut { expr, reg: _, late: _ } => vis.visit_expr(expr), |
| InlineAsmOperand::Out { expr: None, reg: _, late: _ } => {} |
| InlineAsmOperand::SplitInOut { in_expr, out_expr, reg: _, late: _ } => { |
| vis.visit_expr(in_expr); |
| if let Some(out_expr) = out_expr { |
| vis.visit_expr(out_expr); |
| } |
| } |
| InlineAsmOperand::Const { anon_const } => vis.visit_anon_const(anon_const), |
| InlineAsmOperand::Sym { sym } => vis.visit_inline_asm_sym(sym), |
| InlineAsmOperand::Label { block } => vis.visit_block(block), |
| } |
| vis.visit_span(span); |
| } |
| } |
| |
| fn walk_inline_asm_sym<T: MutVisitor>( |
| vis: &mut T, |
| InlineAsmSym { id, qself, path }: &mut InlineAsmSym, |
| ) { |
| vis.visit_id(id); |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| } |
| |
| fn walk_format_args<T: MutVisitor>(vis: &mut T, fmt: &mut FormatArgs) { |
| // FIXME: visit the template exhaustively. |
| let FormatArgs { span, template: _, arguments, uncooked_fmt_str: _ } = fmt; |
| for FormatArgument { kind, expr } in arguments.all_args_mut() { |
| match kind { |
| FormatArgumentKind::Named(ident) | FormatArgumentKind::Captured(ident) => { |
| vis.visit_ident(ident) |
| } |
| FormatArgumentKind::Normal => {} |
| } |
| vis.visit_expr(expr); |
| } |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_expr<T: MutVisitor>(vis: &mut T, Expr { kind, id, span, attrs, tokens: _ }: &mut Expr) { |
| vis.visit_id(id); |
| visit_attrs(vis, attrs); |
| match kind { |
| ExprKind::Array(exprs) => visit_thin_exprs(vis, exprs), |
| ExprKind::ConstBlock(anon_const) => { |
| vis.visit_anon_const(anon_const); |
| } |
| ExprKind::Repeat(expr, count) => { |
| vis.visit_expr(expr); |
| vis.visit_anon_const(count); |
| } |
| ExprKind::Tup(exprs) => visit_thin_exprs(vis, exprs), |
| ExprKind::Call(f, args) => { |
| vis.visit_expr(f); |
| visit_thin_exprs(vis, args); |
| } |
| ExprKind::MethodCall(box MethodCall { |
| seg: PathSegment { ident, id, args: seg_args }, |
| receiver, |
| args: call_args, |
| span, |
| }) => { |
| vis.visit_method_receiver_expr(receiver); |
| vis.visit_id(id); |
| vis.visit_ident(ident); |
| visit_opt(seg_args, |args| vis.visit_generic_args(args)); |
| visit_thin_exprs(vis, call_args); |
| vis.visit_span(span); |
| } |
| ExprKind::Binary(binop, lhs, rhs) => { |
| vis.visit_expr(lhs); |
| vis.visit_expr(rhs); |
| vis.visit_span(&mut binop.span); |
| } |
| ExprKind::Unary(_unop, ohs) => vis.visit_expr(ohs), |
| ExprKind::Cast(expr, ty) => { |
| vis.visit_expr(expr); |
| vis.visit_ty(ty); |
| } |
| ExprKind::Type(expr, ty) => { |
| vis.visit_expr(expr); |
| vis.visit_ty(ty); |
| } |
| ExprKind::AddrOf(_kind, _mut, ohs) => vis.visit_expr(ohs), |
| ExprKind::Let(pat, scrutinee, span, _recovered) => { |
| vis.visit_pat(pat); |
| vis.visit_expr(scrutinee); |
| vis.visit_span(span); |
| } |
| ExprKind::If(cond, tr, fl) => { |
| vis.visit_expr(cond); |
| vis.visit_block(tr); |
| visit_opt(fl, |fl| ensure_sufficient_stack(|| vis.visit_expr(fl))); |
| } |
| ExprKind::While(cond, body, label) => { |
| visit_opt(label, |label| vis.visit_label(label)); |
| vis.visit_expr(cond); |
| vis.visit_block(body); |
| } |
| ExprKind::ForLoop { pat, iter, body, label, kind: _ } => { |
| visit_opt(label, |label| vis.visit_label(label)); |
| vis.visit_pat(pat); |
| vis.visit_expr(iter); |
| vis.visit_block(body); |
| } |
| ExprKind::Loop(body, label, span) => { |
| visit_opt(label, |label| vis.visit_label(label)); |
| vis.visit_block(body); |
| vis.visit_span(span); |
| } |
| ExprKind::Match(expr, arms, _kind) => { |
| vis.visit_expr(expr); |
| arms.flat_map_in_place(|arm| vis.flat_map_arm(arm)); |
| } |
| ExprKind::Closure(box Closure { |
| binder, |
| capture_clause, |
| constness, |
| coroutine_kind, |
| movability: _, |
| fn_decl, |
| body, |
| fn_decl_span, |
| fn_arg_span, |
| }) => { |
| visit_constness(vis, constness); |
| vis.visit_capture_by(capture_clause); |
| vis.visit_fn(FnKind::Closure(binder, coroutine_kind, fn_decl, body), *span, *id); |
| vis.visit_span(fn_decl_span); |
| vis.visit_span(fn_arg_span); |
| } |
| ExprKind::Block(blk, label) => { |
| visit_opt(label, |label| vis.visit_label(label)); |
| vis.visit_block(blk); |
| } |
| ExprKind::Gen(_capture_by, body, _kind, decl_span) => { |
| vis.visit_block(body); |
| vis.visit_span(decl_span); |
| } |
| ExprKind::Await(expr, await_kw_span) => { |
| vis.visit_expr(expr); |
| vis.visit_span(await_kw_span); |
| } |
| ExprKind::Use(expr, use_kw_span) => { |
| vis.visit_expr(expr); |
| vis.visit_span(use_kw_span); |
| } |
| ExprKind::Assign(el, er, span) => { |
| vis.visit_expr(el); |
| vis.visit_expr(er); |
| vis.visit_span(span); |
| } |
| ExprKind::AssignOp(_op, el, er) => { |
| vis.visit_expr(el); |
| vis.visit_expr(er); |
| } |
| ExprKind::Field(el, ident) => { |
| vis.visit_expr(el); |
| vis.visit_ident(ident); |
| } |
| ExprKind::Index(el, er, brackets_span) => { |
| vis.visit_expr(el); |
| vis.visit_expr(er); |
| vis.visit_span(brackets_span); |
| } |
| ExprKind::Range(e1, e2, _lim) => { |
| visit_opt(e1, |e1| vis.visit_expr(e1)); |
| visit_opt(e2, |e2| vis.visit_expr(e2)); |
| } |
| ExprKind::Underscore => {} |
| ExprKind::Path(qself, path) => { |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| } |
| ExprKind::Break(label, expr) => { |
| visit_opt(label, |label| vis.visit_label(label)); |
| visit_opt(expr, |expr| vis.visit_expr(expr)); |
| } |
| ExprKind::Continue(label) => { |
| visit_opt(label, |label| vis.visit_label(label)); |
| } |
| ExprKind::Ret(expr) => { |
| visit_opt(expr, |expr| vis.visit_expr(expr)); |
| } |
| ExprKind::Yeet(expr) => { |
| visit_opt(expr, |expr| vis.visit_expr(expr)); |
| } |
| ExprKind::Become(expr) => vis.visit_expr(expr), |
| ExprKind::InlineAsm(asm) => vis.visit_inline_asm(asm), |
| ExprKind::FormatArgs(fmt) => vis.visit_format_args(fmt), |
| ExprKind::OffsetOf(container, fields) => { |
| vis.visit_ty(container); |
| for field in fields.iter_mut() { |
| vis.visit_ident(field); |
| } |
| } |
| ExprKind::MacCall(mac) => vis.visit_mac_call(mac), |
| ExprKind::Struct(se) => { |
| let StructExpr { qself, path, fields, rest } = se.deref_mut(); |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| fields.flat_map_in_place(|field| vis.flat_map_expr_field(field)); |
| match rest { |
| StructRest::Base(expr) => vis.visit_expr(expr), |
| StructRest::Rest(_span) => {} |
| StructRest::None => {} |
| } |
| } |
| ExprKind::Paren(expr) => { |
| vis.visit_expr(expr); |
| } |
| ExprKind::Yield(kind) => { |
| let expr = kind.expr_mut(); |
| if let Some(expr) = expr { |
| vis.visit_expr(expr); |
| } |
| } |
| ExprKind::Try(expr) => vis.visit_expr(expr), |
| ExprKind::TryBlock(body) => vis.visit_block(body), |
| ExprKind::Lit(_token) => {} |
| ExprKind::IncludedBytes(_bytes) => {} |
| ExprKind::UnsafeBinderCast(_kind, expr, ty) => { |
| vis.visit_expr(expr); |
| if let Some(ty) = ty { |
| vis.visit_ty(ty); |
| } |
| } |
| ExprKind::Err(_guar) => {} |
| ExprKind::Dummy => {} |
| } |
| vis.visit_span(span); |
| } |
| |
| pub fn walk_filter_map_expr<T: MutVisitor>(vis: &mut T, mut e: P<Expr>) -> Option<P<Expr>> { |
| vis.visit_expr(&mut e); |
| Some(e) |
| } |
| |
| pub fn walk_flat_map_stmt<T: MutVisitor>( |
| vis: &mut T, |
| Stmt { kind, span, mut id }: Stmt, |
| ) -> SmallVec<[Stmt; 1]> { |
| vis.visit_id(&mut id); |
| let mut stmts: SmallVec<[Stmt; 1]> = walk_flat_map_stmt_kind(vis, kind) |
| .into_iter() |
| .map(|kind| Stmt { id, kind, span }) |
| .collect(); |
| match &mut stmts[..] { |
| [] => {} |
| [stmt] => vis.visit_span(&mut stmt.span), |
| _ => panic!( |
| "cloning statement `NodeId`s is prohibited by default, \ |
| the visitor should implement custom statement visiting" |
| ), |
| } |
| stmts |
| } |
| |
| fn walk_flat_map_stmt_kind<T: MutVisitor>(vis: &mut T, kind: StmtKind) -> SmallVec<[StmtKind; 1]> { |
| match kind { |
| StmtKind::Let(mut local) => smallvec![StmtKind::Let({ |
| vis.visit_local(&mut local); |
| local |
| })], |
| StmtKind::Item(item) => vis.flat_map_item(item).into_iter().map(StmtKind::Item).collect(), |
| StmtKind::Expr(expr) => vis.filter_map_expr(expr).into_iter().map(StmtKind::Expr).collect(), |
| StmtKind::Semi(expr) => vis.filter_map_expr(expr).into_iter().map(StmtKind::Semi).collect(), |
| StmtKind::Empty => smallvec![StmtKind::Empty], |
| StmtKind::MacCall(mut mac) => { |
| let MacCallStmt { mac: mac_, style: _, attrs, tokens: _ } = mac.deref_mut(); |
| visit_attrs(vis, attrs); |
| vis.visit_mac_call(mac_); |
| smallvec![StmtKind::MacCall(mac)] |
| } |
| } |
| } |
| |
| fn walk_vis<T: MutVisitor>(vis: &mut T, visibility: &mut Visibility) { |
| let Visibility { kind, span, tokens: _ } = visibility; |
| match kind { |
| VisibilityKind::Public | VisibilityKind::Inherited => {} |
| VisibilityKind::Restricted { path, id, shorthand: _ } => { |
| vis.visit_id(id); |
| vis.visit_path(path); |
| } |
| } |
| vis.visit_span(span); |
| } |
| |
| fn walk_capture_by<T: MutVisitor>(vis: &mut T, capture_by: &mut CaptureBy) { |
| match capture_by { |
| CaptureBy::Ref => {} |
| CaptureBy::Value { move_kw } => { |
| vis.visit_span(move_kw); |
| } |
| CaptureBy::Use { use_kw } => { |
| vis.visit_span(use_kw); |
| } |
| } |
| } |
| |
| #[derive(Debug)] |
| pub enum FnKind<'a> { |
| /// E.g., `fn foo()`, `fn foo(&self)`, or `extern "Abi" fn foo()`. |
| Fn(FnCtxt, &'a mut Visibility, &'a mut Fn), |
| |
| /// E.g., `|x, y| body`. |
| Closure( |
| &'a mut ClosureBinder, |
| &'a mut Option<CoroutineKind>, |
| &'a mut P<FnDecl>, |
| &'a mut P<Expr>, |
| ), |
| } |
