| //! AST walker. Each overridden visit method has full control over what |
| //! happens with its node, it can do its own traversal of the node's children, |
| //! call `visit::walk_*` to apply the default traversal algorithm, or prevent |
| //! deeper traversal by doing nothing. |
| //! |
| //! Note: it is an important invariant that the default visitor walks the body |
| //! of a function in "execution order" (more concretely, reverse post-order |
| //! with respect to the CFG implied by the AST), meaning that if AST node A may |
| //! execute before AST node B, then A is visited first. The borrow checker in |
| //! particular relies on this property. |
| //! |
| //! Note: walking an AST before macro expansion is probably a bad idea. For |
| //! instance, a walker looking for item names in a module will miss all of |
| //! those that are created by the expansion of a macro. |
| |
| pub use rustc_ast_ir::visit::VisitorResult; |
| pub use rustc_ast_ir::{try_visit, visit_opt, walk_list, walk_visitable_list}; |
| use rustc_span::Span; |
| use rustc_span::symbol::Ident; |
| |
| use crate::ast::*; |
| use crate::ptr::P; |
| |
| #[derive(Copy, Clone, Debug, PartialEq)] |
| pub enum AssocCtxt { |
| Trait, |
| Impl, |
| } |
| |
| #[derive(Copy, Clone, Debug, PartialEq)] |
| pub enum FnCtxt { |
| Free, |
| Foreign, |
| Assoc(AssocCtxt), |
| } |
| |
| #[derive(Copy, Clone, Debug)] |
| pub enum BoundKind { |
| /// Trait bounds in generics bounds and type/trait alias. |
| /// E.g., `<T: Bound>`, `type A: Bound`, or `where T: Bound`. |
| Bound, |
| |
| /// Trait bounds in `impl` type. |
| /// E.g., `type Foo = impl Bound1 + Bound2 + Bound3`. |
| Impl, |
| |
| /// Trait bounds in trait object type. |
| /// E.g., `dyn Bound1 + Bound2 + Bound3`. |
| TraitObject, |
| |
| /// Super traits of a trait. |
| /// E.g., `trait A: B` |
| SuperTraits, |
| } |
| impl BoundKind { |
| pub fn descr(self) -> &'static str { |
| match self { |
| BoundKind::Bound => "bounds", |
| BoundKind::Impl => "`impl Trait`", |
| BoundKind::TraitObject => "`dyn` trait object bounds", |
| BoundKind::SuperTraits => "supertrait bounds", |
| } |
| } |
| } |
| |
| #[derive(Copy, Clone, Debug)] |
| pub enum FnKind<'a> { |
| /// E.g., `fn foo()`, `fn foo(&self)`, or `extern "Abi" fn foo()`. |
| Fn(FnCtxt, Ident, &'a FnSig, &'a Visibility, &'a Generics, Option<&'a Block>), |
| |
| /// E.g., `|x, y| body`. |
| Closure(&'a ClosureBinder, &'a Option<CoroutineKind>, &'a FnDecl, &'a Expr), |
| } |
| |
| impl<'a> FnKind<'a> { |
| pub fn header(&self) -> Option<&'a FnHeader> { |
| match *self { |
| FnKind::Fn(_, _, sig, _, _, _) => Some(&sig.header), |
| FnKind::Closure(..) => None, |
| } |
| } |
| |
| pub fn ident(&self) -> Option<&Ident> { |
| match self { |
| FnKind::Fn(_, ident, ..) => Some(ident), |
| _ => None, |
| } |
| } |
| |
| pub fn decl(&self) -> &'a FnDecl { |
| match self { |
| FnKind::Fn(_, _, sig, _, _, _) => &sig.decl, |
| FnKind::Closure(_, _, decl, _) => decl, |
| } |
| } |
| |
| pub fn ctxt(&self) -> Option<FnCtxt> { |
| match self { |
| FnKind::Fn(ctxt, ..) => Some(*ctxt), |
| FnKind::Closure(..) => None, |
| } |
| } |
| } |
| |
| #[derive(Copy, Clone, Debug)] |
| pub enum LifetimeCtxt { |
| /// Appears in a reference type. |
| Ref, |
| /// Appears as a bound on a type or another lifetime. |
| Bound, |
| /// Appears as a generic argument. |
| GenericArg, |
| } |
| |
| pub trait WalkItemKind: Sized { |
| fn walk<'a, V: Visitor<'a>>( |
| &'a self, |
| item: &'a Item<Self>, |
| ctxt: AssocCtxt, |
| visitor: &mut V, |
| ) -> V::Result; |
| } |
| |
| /// Each method of the `Visitor` trait is a hook to be potentially |
| /// overridden. Each method's default implementation recursively visits |
| /// the substructure of the input via the corresponding `walk` method; |
| /// e.g., the `visit_item` method by default calls `visit::walk_item`. |
| /// |
| /// If you want to ensure that your code handles every variant |
| /// explicitly, you need to override each method. (And you also need |
| /// to monitor future changes to `Visitor` in case a new method with a |
| /// new default implementation gets introduced.) |
| pub trait Visitor<'ast>: Sized { |
| /// The result type of the `visit_*` methods. Can be either `()`, |
| /// or `ControlFlow<T>`. |
| type Result: VisitorResult = (); |
| |
| fn visit_ident(&mut self, _ident: Ident) -> Self::Result { |
| Self::Result::output() |
| } |
| fn visit_foreign_item(&mut self, i: &'ast ForeignItem) -> Self::Result { |
| walk_item(self, i) |
| } |
| fn visit_item(&mut self, i: &'ast Item) -> Self::Result { |
| walk_item(self, i) |
| } |
| fn visit_local(&mut self, l: &'ast Local) -> Self::Result { |
| walk_local(self, l) |
| } |
| fn visit_block(&mut self, b: &'ast Block) -> Self::Result { |
| walk_block(self, b) |
| } |
| fn visit_stmt(&mut self, s: &'ast Stmt) -> Self::Result { |
| walk_stmt(self, s) |
| } |
| fn visit_param(&mut self, param: &'ast Param) -> Self::Result { |
| walk_param(self, param) |
| } |
| fn visit_arm(&mut self, a: &'ast Arm) -> Self::Result { |
| walk_arm(self, a) |
| } |
| fn visit_pat(&mut self, p: &'ast Pat) -> Self::Result { |
| walk_pat(self, p) |
| } |
| fn visit_anon_const(&mut self, c: &'ast AnonConst) -> Self::Result { |
| walk_anon_const(self, c) |
| } |
| fn visit_expr(&mut self, ex: &'ast Expr) -> Self::Result { |
| walk_expr(self, ex) |
| } |
| /// 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: &'ast Expr) -> Self::Result { |
| self.visit_expr(ex) |
| } |
| fn visit_expr_post(&mut self, _ex: &'ast Expr) -> Self::Result { |
| Self::Result::output() |
| } |
| fn visit_ty(&mut self, t: &'ast Ty) -> Self::Result { |
| walk_ty(self, t) |
| } |
| fn visit_generic_param(&mut self, param: &'ast GenericParam) -> Self::Result { |
| walk_generic_param(self, param) |
| } |
| fn visit_generics(&mut self, g: &'ast Generics) -> Self::Result { |
| walk_generics(self, g) |
| } |
| fn visit_closure_binder(&mut self, b: &'ast ClosureBinder) -> Self::Result { |
| walk_closure_binder(self, b) |
| } |
| fn visit_where_predicate(&mut self, p: &'ast WherePredicate) -> Self::Result { |
| walk_where_predicate(self, p) |
| } |
| fn visit_fn(&mut self, fk: FnKind<'ast>, _: Span, _: NodeId) -> Self::Result { |
| walk_fn(self, fk) |
| } |
| fn visit_assoc_item(&mut self, i: &'ast AssocItem, ctxt: AssocCtxt) -> Self::Result { |
| walk_assoc_item(self, i, ctxt) |
| } |
| fn visit_trait_ref(&mut self, t: &'ast TraitRef) -> Self::Result { |
| walk_trait_ref(self, t) |
| } |
| fn visit_param_bound(&mut self, bounds: &'ast GenericBound, _ctxt: BoundKind) -> Self::Result { |
| walk_param_bound(self, bounds) |
| } |
| fn visit_precise_capturing_arg(&mut self, arg: &'ast PreciseCapturingArg) { |
| walk_precise_capturing_arg(self, arg); |
| } |
| fn visit_poly_trait_ref(&mut self, t: &'ast PolyTraitRef) -> Self::Result { |
| walk_poly_trait_ref(self, t) |
| } |
| fn visit_variant_data(&mut self, s: &'ast VariantData) -> Self::Result { |
| walk_struct_def(self, s) |
| } |
| fn visit_field_def(&mut self, s: &'ast FieldDef) -> Self::Result { |
| walk_field_def(self, s) |
| } |
| fn visit_enum_def(&mut self, enum_definition: &'ast EnumDef) -> Self::Result { |
| walk_enum_def(self, enum_definition) |
| } |
| fn visit_variant(&mut self, v: &'ast Variant) -> Self::Result { |
| walk_variant(self, v) |
| } |
| fn visit_variant_discr(&mut self, discr: &'ast AnonConst) -> Self::Result { |
| self.visit_anon_const(discr) |
| } |
| fn visit_label(&mut self, label: &'ast Label) -> Self::Result { |
| walk_label(self, label) |
| } |
| fn visit_lifetime(&mut self, lifetime: &'ast Lifetime, _: LifetimeCtxt) -> Self::Result { |
| walk_lifetime(self, lifetime) |
| } |
| fn visit_mac_call(&mut self, mac: &'ast MacCall) -> Self::Result { |
| walk_mac(self, mac) |
| } |
| fn visit_mac_def(&mut self, _mac: &'ast MacroDef, _id: NodeId) -> Self::Result { |
| Self::Result::output() |
| } |
| fn visit_path(&mut self, path: &'ast Path, _id: NodeId) -> Self::Result { |
| walk_path(self, path) |
| } |
| fn visit_use_tree( |
| &mut self, |
| use_tree: &'ast UseTree, |
| id: NodeId, |
| _nested: bool, |
| ) -> Self::Result { |
| walk_use_tree(self, use_tree, id) |
| } |
| fn visit_path_segment(&mut self, path_segment: &'ast PathSegment) -> Self::Result { |
| walk_path_segment(self, path_segment) |
| } |
| fn visit_generic_args(&mut self, generic_args: &'ast GenericArgs) -> Self::Result { |
| walk_generic_args(self, generic_args) |
| } |
| fn visit_generic_arg(&mut self, generic_arg: &'ast GenericArg) -> Self::Result { |
| walk_generic_arg(self, generic_arg) |
| } |
| fn visit_assoc_item_constraint( |
| &mut self, |
| constraint: &'ast AssocItemConstraint, |
| ) -> Self::Result { |
| walk_assoc_item_constraint(self, constraint) |
| } |
| fn visit_attribute(&mut self, attr: &'ast Attribute) -> Self::Result { |
| walk_attribute(self, attr) |
| } |
| fn visit_vis(&mut self, vis: &'ast Visibility) -> Self::Result { |
| walk_vis(self, vis) |
| } |
| fn visit_fn_ret_ty(&mut self, ret_ty: &'ast FnRetTy) -> Self::Result { |
| walk_fn_ret_ty(self, ret_ty) |
| } |
| fn visit_fn_header(&mut self, _header: &'ast FnHeader) -> Self::Result { |
| Self::Result::output() |
| } |
| fn visit_expr_field(&mut self, f: &'ast ExprField) -> Self::Result { |
| walk_expr_field(self, f) |
| } |
| fn visit_pat_field(&mut self, fp: &'ast PatField) -> Self::Result { |
| walk_pat_field(self, fp) |
| } |
| fn visit_crate(&mut self, krate: &'ast Crate) -> Self::Result { |
| walk_crate(self, krate) |
| } |
| fn visit_inline_asm(&mut self, asm: &'ast InlineAsm) -> Self::Result { |
| walk_inline_asm(self, asm) |
| } |
| fn visit_format_args(&mut self, fmt: &'ast FormatArgs) -> Self::Result { |
| walk_format_args(self, fmt) |
| } |
| fn visit_inline_asm_sym(&mut self, sym: &'ast InlineAsmSym) -> Self::Result { |
| walk_inline_asm_sym(self, sym) |
| } |
| fn visit_capture_by(&mut self, _capture_by: &'ast CaptureBy) -> Self::Result { |
| Self::Result::output() |
| } |
| } |
| |
| pub fn walk_crate<'a, V: Visitor<'a>>(visitor: &mut V, krate: &'a Crate) -> V::Result { |
| let Crate { attrs, items, spans: _, id: _, is_placeholder: _ } = krate; |
| walk_list!(visitor, visit_attribute, attrs); |
| walk_list!(visitor, visit_item, items); |
| V::Result::output() |
| } |
| |
| pub fn walk_local<'a, V: Visitor<'a>>(visitor: &mut V, local: &'a Local) -> V::Result { |
| let Local { id: _, pat, ty, kind, span: _, colon_sp: _, attrs, tokens: _ } = local; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_pat(pat)); |
| visit_opt!(visitor, visit_ty, ty); |
| if let Some((init, els)) = kind.init_else_opt() { |
| try_visit!(visitor.visit_expr(init)); |
| visit_opt!(visitor, visit_block, els); |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_label<'a, V: Visitor<'a>>(visitor: &mut V, Label { ident }: &'a Label) -> V::Result { |
| visitor.visit_ident(*ident) |
| } |
| |
| pub fn walk_lifetime<'a, V: Visitor<'a>>(visitor: &mut V, lifetime: &'a Lifetime) -> V::Result { |
| let Lifetime { id: _, ident } = lifetime; |
| visitor.visit_ident(*ident) |
| } |
| |
| pub fn walk_poly_trait_ref<'a, V>(visitor: &mut V, trait_ref: &'a PolyTraitRef) -> V::Result |
| where |
| V: Visitor<'a>, |
| { |
| let PolyTraitRef { bound_generic_params, trait_ref, span: _ } = trait_ref; |
| walk_list!(visitor, visit_generic_param, bound_generic_params); |
| visitor.visit_trait_ref(trait_ref) |
| } |
| |
| pub fn walk_trait_ref<'a, V: Visitor<'a>>(visitor: &mut V, trait_ref: &'a TraitRef) -> V::Result { |
| let TraitRef { path, ref_id } = trait_ref; |
| visitor.visit_path(path, *ref_id) |
| } |
| |
| impl WalkItemKind for ItemKind { |
| fn walk<'a, V: Visitor<'a>>( |
| &'a self, |
| item: &'a Item<Self>, |
| _ctxt: AssocCtxt, |
| visitor: &mut V, |
| ) -> V::Result { |
| let Item { id, span, vis, ident, .. } = item; |
| match self { |
| ItemKind::ExternCrate(_rename) => {} |
| ItemKind::Use(use_tree) => try_visit!(visitor.visit_use_tree(use_tree, *id, false)), |
| ItemKind::Static(box StaticItem { ty, safety: _, mutability: _, expr }) => { |
| try_visit!(visitor.visit_ty(ty)); |
| visit_opt!(visitor, visit_expr, expr); |
| } |
| ItemKind::Const(box ConstItem { defaultness: _, generics, ty, expr }) => { |
| try_visit!(visitor.visit_generics(generics)); |
| try_visit!(visitor.visit_ty(ty)); |
| visit_opt!(visitor, visit_expr, expr); |
| } |
| ItemKind::Fn(box Fn { defaultness: _, generics, sig, body }) => { |
| let kind = FnKind::Fn(FnCtxt::Free, *ident, sig, vis, generics, body.as_deref()); |
| try_visit!(visitor.visit_fn(kind, *span, *id)); |
| } |
| ItemKind::Mod(_unsafety, mod_kind) => match mod_kind { |
| ModKind::Loaded(items, _inline, _inner_span) => { |
| walk_list!(visitor, visit_item, items); |
| } |
| ModKind::Unloaded => {} |
| }, |
| ItemKind::ForeignMod(ForeignMod { safety: _, abi: _, items }) => { |
| walk_list!(visitor, visit_foreign_item, items); |
| } |
| ItemKind::GlobalAsm(asm) => try_visit!(visitor.visit_inline_asm(asm)), |
| ItemKind::TyAlias(box TyAlias { |
| generics, |
| bounds, |
| ty, |
| defaultness: _, |
| where_clauses: _, |
| }) => { |
| try_visit!(visitor.visit_generics(generics)); |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
| visit_opt!(visitor, visit_ty, ty); |
| } |
| ItemKind::Enum(enum_definition, generics) => { |
| try_visit!(visitor.visit_generics(generics)); |
| try_visit!(visitor.visit_enum_def(enum_definition)); |
| } |
| ItemKind::Impl(box Impl { |
| defaultness: _, |
| safety: _, |
| generics, |
| constness: _, |
| polarity: _, |
| of_trait, |
| self_ty, |
| items, |
| }) => { |
| try_visit!(visitor.visit_generics(generics)); |
| visit_opt!(visitor, visit_trait_ref, of_trait); |
| try_visit!(visitor.visit_ty(self_ty)); |
| walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Impl); |
| } |
| ItemKind::Struct(struct_definition, generics) |
| | ItemKind::Union(struct_definition, generics) => { |
| try_visit!(visitor.visit_generics(generics)); |
| try_visit!(visitor.visit_variant_data(struct_definition)); |
| } |
| ItemKind::Trait(box Trait { safety: _, is_auto: _, generics, bounds, items }) => { |
| try_visit!(visitor.visit_generics(generics)); |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::SuperTraits); |
| walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Trait); |
| } |
| ItemKind::TraitAlias(generics, bounds) => { |
| try_visit!(visitor.visit_generics(generics)); |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
| } |
| ItemKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)), |
| ItemKind::MacroDef(ts) => try_visit!(visitor.visit_mac_def(ts, *id)), |
| ItemKind::Delegation(box Delegation { |
| id, |
| qself, |
| path, |
| rename, |
| body, |
| from_glob: _, |
| }) => { |
| try_visit!(walk_qself(visitor, qself)); |
| try_visit!(visitor.visit_path(path, *id)); |
| visit_opt!(visitor, visit_ident, *rename); |
| visit_opt!(visitor, visit_block, body); |
| } |
| ItemKind::DelegationMac(box DelegationMac { qself, prefix, suffixes, body }) => { |
| try_visit!(walk_qself(visitor, qself)); |
| try_visit!(visitor.visit_path(prefix, *id)); |
| if let Some(suffixes) = suffixes { |
| for (ident, rename) in suffixes { |
| visitor.visit_ident(*ident); |
| if let Some(rename) = rename { |
| visitor.visit_ident(*rename); |
| } |
| } |
| } |
| visit_opt!(visitor, visit_block, body); |
| } |
| } |
| V::Result::output() |
| } |
| } |
| |
| pub fn walk_item<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| item: &'a Item<impl WalkItemKind>, |
| ) -> V::Result { |
| walk_assoc_item(visitor, item, AssocCtxt::Trait /*ignored*/) |
| } |
| |
| pub fn walk_enum_def<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| EnumDef { variants }: &'a EnumDef, |
| ) -> V::Result { |
| walk_list!(visitor, visit_variant, variants); |
| V::Result::output() |
| } |
| |
| pub fn walk_variant<'a, V: Visitor<'a>>(visitor: &mut V, variant: &'a Variant) -> V::Result |
| where |
| V: Visitor<'a>, |
| { |
| let Variant { attrs, id: _, span: _, vis, ident, data, disr_expr, is_placeholder: _ } = variant; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_vis(vis)); |
| try_visit!(visitor.visit_ident(*ident)); |
| try_visit!(visitor.visit_variant_data(data)); |
| visit_opt!(visitor, visit_variant_discr, disr_expr); |
| V::Result::output() |
| } |
| |
| pub fn walk_expr_field<'a, V: Visitor<'a>>(visitor: &mut V, f: &'a ExprField) -> V::Result { |
| let ExprField { attrs, id: _, span: _, ident, expr, is_shorthand: _, is_placeholder: _ } = f; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_ident(*ident)); |
| try_visit!(visitor.visit_expr(expr)); |
| V::Result::output() |
| } |
| |
| pub fn walk_pat_field<'a, V: Visitor<'a>>(visitor: &mut V, fp: &'a PatField) -> V::Result { |
| let PatField { ident, pat, is_shorthand: _, attrs, id: _, span: _, is_placeholder: _ } = fp; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_ident(*ident)); |
| try_visit!(visitor.visit_pat(pat)); |
| V::Result::output() |
| } |
| |
| pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) -> V::Result { |
| let Ty { id, kind, span: _, tokens: _ } = typ; |
| match kind { |
| TyKind::Slice(ty) | TyKind::Paren(ty) => try_visit!(visitor.visit_ty(ty)), |
| TyKind::Ptr(MutTy { ty, mutbl: _ }) => try_visit!(visitor.visit_ty(ty)), |
| TyKind::Ref(opt_lifetime, MutTy { ty, mutbl: _ }) => { |
| visit_opt!(visitor, visit_lifetime, opt_lifetime, LifetimeCtxt::Ref); |
| try_visit!(visitor.visit_ty(ty)); |
| } |
| TyKind::Tup(tuple_element_types) => { |
| walk_list!(visitor, visit_ty, tuple_element_types); |
| } |
| TyKind::BareFn(function_declaration) => { |
| let BareFnTy { safety: _, ext: _, generic_params, decl, decl_span: _ } = |
| &**function_declaration; |
| walk_list!(visitor, visit_generic_param, generic_params); |
| try_visit!(walk_fn_decl(visitor, decl)); |
| } |
| TyKind::Path(maybe_qself, path) => { |
| try_visit!(walk_qself(visitor, maybe_qself)); |
| try_visit!(visitor.visit_path(path, *id)); |
| } |
| TyKind::Pat(ty, pat) => { |
| try_visit!(visitor.visit_ty(ty)); |
| try_visit!(visitor.visit_pat(pat)); |
| } |
| TyKind::Array(ty, length) => { |
| try_visit!(visitor.visit_ty(ty)); |
| try_visit!(visitor.visit_anon_const(length)); |
| } |
| TyKind::TraitObject(bounds, _syntax) => { |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::TraitObject); |
| } |
| TyKind::ImplTrait(_id, bounds) => { |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Impl); |
| } |
| TyKind::Typeof(expression) => try_visit!(visitor.visit_anon_const(expression)), |
| TyKind::Infer | TyKind::ImplicitSelf | TyKind::Dummy => {} |
| TyKind::Err(_guar) => {} |
| TyKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)), |
| TyKind::Never | TyKind::CVarArgs => {} |
| } |
| V::Result::output() |
| } |
| |
| fn walk_qself<'a, V: Visitor<'a>>(visitor: &mut V, qself: &'a Option<P<QSelf>>) -> V::Result { |
| if let Some(qself) = qself { |
| let QSelf { ty, path_span: _, position: _ } = &**qself; |
| try_visit!(visitor.visit_ty(ty)); |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_path<'a, V: Visitor<'a>>(visitor: &mut V, path: &'a Path) -> V::Result { |
| let Path { span: _, segments, tokens: _ } = path; |
| walk_list!(visitor, visit_path_segment, segments); |
| V::Result::output() |
| } |
| |
| pub fn walk_use_tree<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| use_tree: &'a UseTree, |
| id: NodeId, |
| ) -> V::Result { |
| let UseTree { prefix, kind, span: _ } = use_tree; |
| try_visit!(visitor.visit_path(prefix, id)); |
| match kind { |
| UseTreeKind::Simple(rename) => { |
| // The extra IDs are handled during AST lowering. |
| visit_opt!(visitor, visit_ident, *rename); |
| } |
| UseTreeKind::Glob => {} |
| UseTreeKind::Nested { ref items, span: _ } => { |
| for &(ref nested_tree, nested_id) in items { |
| try_visit!(visitor.visit_use_tree(nested_tree, nested_id, true)); |
| } |
| } |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_path_segment<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| segment: &'a PathSegment, |
| ) -> V::Result { |
| let PathSegment { ident, id: _, args } = segment; |
| try_visit!(visitor.visit_ident(*ident)); |
| visit_opt!(visitor, visit_generic_args, args); |
| V::Result::output() |
| } |
| |
| pub fn walk_generic_args<'a, V>(visitor: &mut V, generic_args: &'a GenericArgs) -> V::Result |
| where |
| V: Visitor<'a>, |
| { |
| match generic_args { |
| GenericArgs::AngleBracketed(AngleBracketedArgs { span: _, args }) => { |
| for arg in args { |
| match arg { |
| AngleBracketedArg::Arg(a) => try_visit!(visitor.visit_generic_arg(a)), |
| AngleBracketedArg::Constraint(c) => { |
| try_visit!(visitor.visit_assoc_item_constraint(c)) |
| } |
| } |
| } |
| } |
| GenericArgs::Parenthesized(data) => { |
| let ParenthesizedArgs { span: _, inputs, inputs_span: _, output } = data; |
| walk_list!(visitor, visit_ty, inputs); |
| try_visit!(visitor.visit_fn_ret_ty(output)); |
| } |
| GenericArgs::ParenthesizedElided(_span) => {} |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_generic_arg<'a, V>(visitor: &mut V, generic_arg: &'a GenericArg) -> V::Result |
| where |
| V: Visitor<'a>, |
| { |
| match generic_arg { |
| GenericArg::Lifetime(lt) => visitor.visit_lifetime(lt, LifetimeCtxt::GenericArg), |
| GenericArg::Type(ty) => visitor.visit_ty(ty), |
| GenericArg::Const(ct) => visitor.visit_anon_const(ct), |
| } |
| } |
| |
| pub fn walk_assoc_item_constraint<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| constraint: &'a AssocItemConstraint, |
| ) -> V::Result { |
| let AssocItemConstraint { id: _, ident, gen_args, kind, span: _ } = constraint; |
| try_visit!(visitor.visit_ident(*ident)); |
| visit_opt!(visitor, visit_generic_args, gen_args); |
| match kind { |
| AssocItemConstraintKind::Equality { term } => match term { |
| Term::Ty(ty) => try_visit!(visitor.visit_ty(ty)), |
| Term::Const(c) => try_visit!(visitor.visit_anon_const(c)), |
| }, |
| AssocItemConstraintKind::Bound { bounds } => { |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
| } |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_pat<'a, V: Visitor<'a>>(visitor: &mut V, pattern: &'a Pat) -> V::Result { |
| let Pat { id, kind, span: _, tokens: _ } = pattern; |
| match kind { |
| PatKind::TupleStruct(opt_qself, path, elems) => { |
| try_visit!(walk_qself(visitor, opt_qself)); |
| try_visit!(visitor.visit_path(path, *id)); |
| walk_list!(visitor, visit_pat, elems); |
| } |
| PatKind::Path(opt_qself, path) => { |
| try_visit!(walk_qself(visitor, opt_qself)); |
| try_visit!(visitor.visit_path(path, *id)) |
| } |
| PatKind::Struct(opt_qself, path, fields, _rest) => { |
| try_visit!(walk_qself(visitor, opt_qself)); |
| try_visit!(visitor.visit_path(path, *id)); |
| walk_list!(visitor, visit_pat_field, fields); |
| } |
| PatKind::Box(subpattern) | PatKind::Deref(subpattern) | PatKind::Paren(subpattern) => { |
| try_visit!(visitor.visit_pat(subpattern)); |
| } |
| PatKind::Ref(subpattern, _ /*mutbl*/) => { |
| try_visit!(visitor.visit_pat(subpattern)); |
| } |
| PatKind::Ident(_bmode, ident, optional_subpattern) => { |
| try_visit!(visitor.visit_ident(*ident)); |
| visit_opt!(visitor, visit_pat, optional_subpattern); |
| } |
| PatKind::Lit(expression) => try_visit!(visitor.visit_expr(expression)), |
| PatKind::Range(lower_bound, upper_bound, _end) => { |
| visit_opt!(visitor, visit_expr, lower_bound); |
| visit_opt!(visitor, visit_expr, upper_bound); |
| } |
| PatKind::Wild | PatKind::Rest | PatKind::Never => {} |
| PatKind::Err(_guar) => {} |
| PatKind::Tuple(elems) | PatKind::Slice(elems) | PatKind::Or(elems) => { |
| walk_list!(visitor, visit_pat, elems); |
| } |
| PatKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)), |
| } |
| V::Result::output() |
| } |
| |
| impl WalkItemKind for ForeignItemKind { |
| fn walk<'a, V: Visitor<'a>>( |
| &'a self, |
| item: &'a Item<Self>, |
| _ctxt: AssocCtxt, |
| visitor: &mut V, |
| ) -> V::Result { |
| let &Item { id, span, ident, ref vis, .. } = item; |
| match self { |
| ForeignItemKind::Static(box StaticItem { ty, mutability: _, expr, safety: _ }) => { |
| try_visit!(visitor.visit_ty(ty)); |
| visit_opt!(visitor, visit_expr, expr); |
| } |
| ForeignItemKind::Fn(box Fn { defaultness: _, generics, sig, body }) => { |
| let kind = FnKind::Fn(FnCtxt::Foreign, ident, sig, vis, generics, body.as_deref()); |
| try_visit!(visitor.visit_fn(kind, span, id)); |
| } |
| ForeignItemKind::TyAlias(box TyAlias { |
| generics, |
| bounds, |
| ty, |
| defaultness: _, |
| where_clauses: _, |
| }) => { |
| try_visit!(visitor.visit_generics(generics)); |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
| visit_opt!(visitor, visit_ty, ty); |
| } |
| ForeignItemKind::MacCall(mac) => { |
| try_visit!(visitor.visit_mac_call(mac)); |
| } |
| } |
| V::Result::output() |
| } |
| } |
| |
| pub fn walk_param_bound<'a, V: Visitor<'a>>(visitor: &mut V, bound: &'a GenericBound) -> V::Result { |
| match bound { |
| GenericBound::Trait(typ, _modifier) => visitor.visit_poly_trait_ref(typ), |
| GenericBound::Outlives(lifetime) => visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound), |
| GenericBound::Use(args, _span) => { |
| walk_list!(visitor, visit_precise_capturing_arg, args); |
| V::Result::output() |
| } |
| } |
| } |
| |
| pub fn walk_precise_capturing_arg<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| arg: &'a PreciseCapturingArg, |
| ) { |
| match arg { |
| PreciseCapturingArg::Lifetime(lt) => { |
| visitor.visit_lifetime(lt, LifetimeCtxt::GenericArg); |
| } |
| PreciseCapturingArg::Arg(path, id) => { |
| visitor.visit_path(path, *id); |
| } |
| } |
| } |
| |
| pub fn walk_generic_param<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| param: &'a GenericParam, |
| ) -> V::Result { |
| let GenericParam { id: _, ident, attrs, bounds, is_placeholder: _, kind, colon_span: _ } = |
| param; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_ident(*ident)); |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
| match kind { |
| GenericParamKind::Lifetime => (), |
| GenericParamKind::Type { default } => visit_opt!(visitor, visit_ty, default), |
| GenericParamKind::Const { ty, default, kw_span: _ } => { |
| try_visit!(visitor.visit_ty(ty)); |
| visit_opt!(visitor, visit_anon_const, default); |
| } |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_generics<'a, V: Visitor<'a>>(visitor: &mut V, generics: &'a Generics) -> V::Result { |
| let Generics { params, where_clause, span: _ } = generics; |
| let WhereClause { has_where_token: _, predicates, span: _ } = where_clause; |
| walk_list!(visitor, visit_generic_param, params); |
| walk_list!(visitor, visit_where_predicate, predicates); |
| V::Result::output() |
| } |
| |
| pub fn walk_closure_binder<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| binder: &'a ClosureBinder, |
| ) -> V::Result { |
| match binder { |
| ClosureBinder::NotPresent => {} |
| ClosureBinder::For { generic_params, span: _ } => { |
| walk_list!(visitor, visit_generic_param, generic_params) |
| } |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_where_predicate<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| predicate: &'a WherePredicate, |
| ) -> V::Result { |
| match predicate { |
| WherePredicate::BoundPredicate(WhereBoundPredicate { |
| bounded_ty, |
| bounds, |
| bound_generic_params, |
| span: _, |
| }) => { |
| walk_list!(visitor, visit_generic_param, bound_generic_params); |
| try_visit!(visitor.visit_ty(bounded_ty)); |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
| } |
| WherePredicate::RegionPredicate(WhereRegionPredicate { lifetime, bounds, span: _ }) => { |
| try_visit!(visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound)); |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
| } |
| WherePredicate::EqPredicate(WhereEqPredicate { lhs_ty, rhs_ty, span: _ }) => { |
| try_visit!(visitor.visit_ty(lhs_ty)); |
| try_visit!(visitor.visit_ty(rhs_ty)); |
| } |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_fn_ret_ty<'a, V: Visitor<'a>>(visitor: &mut V, ret_ty: &'a FnRetTy) -> V::Result { |
| match ret_ty { |
| FnRetTy::Default(_span) => {} |
| FnRetTy::Ty(output_ty) => try_visit!(visitor.visit_ty(output_ty)), |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_fn_decl<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| FnDecl { inputs, output }: &'a FnDecl, |
| ) -> V::Result { |
| walk_list!(visitor, visit_param, inputs); |
| visitor.visit_fn_ret_ty(output) |
| } |
| |
| pub fn walk_fn<'a, V: Visitor<'a>>(visitor: &mut V, kind: FnKind<'a>) -> V::Result { |
| match kind { |
| FnKind::Fn(_ctxt, _ident, FnSig { header, decl, span: _ }, _vis, generics, body) => { |
| // Identifier and visibility are visited as a part of the item. |
| try_visit!(visitor.visit_fn_header(header)); |
| try_visit!(visitor.visit_generics(generics)); |
| try_visit!(walk_fn_decl(visitor, decl)); |
| visit_opt!(visitor, visit_block, body); |
| } |
| FnKind::Closure(binder, _coroutine_kind, decl, body) => { |
| try_visit!(visitor.visit_closure_binder(binder)); |
| try_visit!(walk_fn_decl(visitor, decl)); |
| try_visit!(visitor.visit_expr(body)); |
| } |
| } |
| V::Result::output() |
| } |
| |
| impl WalkItemKind for AssocItemKind { |
| fn walk<'a, V: Visitor<'a>>( |
| &'a self, |
| item: &'a Item<Self>, |
| ctxt: AssocCtxt, |
| visitor: &mut V, |
| ) -> V::Result { |
| let &Item { id, span, ident, ref vis, .. } = item; |
| match self { |
| AssocItemKind::Const(box ConstItem { defaultness: _, generics, ty, expr }) => { |
| try_visit!(visitor.visit_generics(generics)); |
| try_visit!(visitor.visit_ty(ty)); |
| visit_opt!(visitor, visit_expr, expr); |
| } |
| AssocItemKind::Fn(box Fn { defaultness: _, generics, sig, body }) => { |
| let kind = |
| FnKind::Fn(FnCtxt::Assoc(ctxt), ident, sig, vis, generics, body.as_deref()); |
| try_visit!(visitor.visit_fn(kind, span, id)); |
| } |
| AssocItemKind::Type(box TyAlias { |
| generics, |
| bounds, |
| ty, |
| defaultness: _, |
| where_clauses: _, |
| }) => { |
| try_visit!(visitor.visit_generics(generics)); |
| walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
| visit_opt!(visitor, visit_ty, ty); |
| } |
| AssocItemKind::MacCall(mac) => { |
| try_visit!(visitor.visit_mac_call(mac)); |
| } |
| AssocItemKind::Delegation(box Delegation { |
| id, |
| qself, |
| path, |
| rename, |
| body, |
| from_glob: _, |
| }) => { |
| try_visit!(walk_qself(visitor, qself)); |
| try_visit!(visitor.visit_path(path, *id)); |
| visit_opt!(visitor, visit_ident, *rename); |
| visit_opt!(visitor, visit_block, body); |
| } |
| AssocItemKind::DelegationMac(box DelegationMac { qself, prefix, suffixes, body }) => { |
| try_visit!(walk_qself(visitor, qself)); |
| try_visit!(visitor.visit_path(prefix, id)); |
| if let Some(suffixes) = suffixes { |
| for (ident, rename) in suffixes { |
| visitor.visit_ident(*ident); |
| if let Some(rename) = rename { |
| visitor.visit_ident(*rename); |
| } |
| } |
| } |
| visit_opt!(visitor, visit_block, body); |
| } |
| } |
| V::Result::output() |
| } |
| } |
| |
| pub fn walk_assoc_item<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| item: &'a Item<impl WalkItemKind>, |
| ctxt: AssocCtxt, |
| ) -> V::Result { |
| let &Item { id: _, span: _, ident, ref vis, ref attrs, ref kind, tokens: _ } = item; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_vis(vis)); |
| try_visit!(visitor.visit_ident(ident)); |
| try_visit!(kind.walk(item, ctxt, visitor)); |
| V::Result::output() |
| } |
| |
| pub fn walk_struct_def<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| struct_definition: &'a VariantData, |
| ) -> V::Result { |
| walk_list!(visitor, visit_field_def, struct_definition.fields()); |
| V::Result::output() |
| } |
| |
| pub fn walk_field_def<'a, V: Visitor<'a>>(visitor: &mut V, field: &'a FieldDef) -> V::Result { |
| let FieldDef { attrs, id: _, span: _, vis, ident, ty, is_placeholder: _ } = field; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_vis(vis)); |
| visit_opt!(visitor, visit_ident, *ident); |
| try_visit!(visitor.visit_ty(ty)); |
| V::Result::output() |
| } |
| |
| pub fn walk_block<'a, V: Visitor<'a>>(visitor: &mut V, block: &'a Block) -> V::Result { |
| let Block { stmts, id: _, rules: _, span: _, tokens: _, could_be_bare_literal: _ } = block; |
| walk_list!(visitor, visit_stmt, stmts); |
| V::Result::output() |
| } |
| |
| pub fn walk_stmt<'a, V: Visitor<'a>>(visitor: &mut V, statement: &'a Stmt) -> V::Result { |
| let Stmt { id: _, kind, span: _ } = statement; |
| match kind { |
| StmtKind::Let(local) => try_visit!(visitor.visit_local(local)), |
| StmtKind::Item(item) => try_visit!(visitor.visit_item(item)), |
| StmtKind::Expr(expr) | StmtKind::Semi(expr) => try_visit!(visitor.visit_expr(expr)), |
| StmtKind::Empty => {} |
| StmtKind::MacCall(mac) => { |
| let MacCallStmt { mac, attrs, style: _, tokens: _ } = &**mac; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_mac_call(mac)); |
| } |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_mac<'a, V: Visitor<'a>>(visitor: &mut V, mac: &'a MacCall) -> V::Result { |
| let MacCall { path, args: _ } = mac; |
| visitor.visit_path(path, DUMMY_NODE_ID) |
| } |
| |
| pub fn walk_anon_const<'a, V: Visitor<'a>>(visitor: &mut V, constant: &'a AnonConst) -> V::Result { |
| let AnonConst { id: _, value } = constant; |
| visitor.visit_expr(value) |
| } |
| |
| pub fn walk_inline_asm<'a, V: Visitor<'a>>(visitor: &mut V, asm: &'a InlineAsm) -> V::Result { |
| 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: _ } => { |
| try_visit!(visitor.visit_expr(expr)) |
| } |
| InlineAsmOperand::Out { expr: None, reg: _, late: _ } => {} |
| InlineAsmOperand::SplitInOut { in_expr, out_expr, reg: _, late: _ } => { |
| try_visit!(visitor.visit_expr(in_expr)); |
| visit_opt!(visitor, visit_expr, out_expr); |
| } |
| InlineAsmOperand::Const { anon_const } => { |
| try_visit!(visitor.visit_anon_const(anon_const)) |
| } |
| InlineAsmOperand::Sym { sym } => try_visit!(visitor.visit_inline_asm_sym(sym)), |
| InlineAsmOperand::Label { block } => try_visit!(visitor.visit_block(block)), |
| } |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_inline_asm_sym<'a, V: Visitor<'a>>( |
| visitor: &mut V, |
| InlineAsmSym { id, qself, path }: &'a InlineAsmSym, |
| ) -> V::Result { |
| try_visit!(walk_qself(visitor, qself)); |
| visitor.visit_path(path, *id) |
| } |
| |
| pub fn walk_format_args<'a, V: Visitor<'a>>(visitor: &mut V, fmt: &'a FormatArgs) -> V::Result { |
| let FormatArgs { span: _, template: _, arguments } = fmt; |
| for FormatArgument { kind, expr } in arguments.all_args() { |
| match kind { |
| FormatArgumentKind::Named(ident) | FormatArgumentKind::Captured(ident) => { |
| try_visit!(visitor.visit_ident(*ident)) |
| } |
| FormatArgumentKind::Normal => {} |
| } |
| try_visit!(visitor.visit_expr(expr)); |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) -> V::Result { |
| let Expr { id, kind, span, attrs, tokens: _ } = expression; |
| walk_list!(visitor, visit_attribute, attrs); |
| match kind { |
| ExprKind::Array(subexpressions) => { |
| walk_list!(visitor, visit_expr, subexpressions); |
| } |
| ExprKind::ConstBlock(anon_const) => try_visit!(visitor.visit_anon_const(anon_const)), |
| ExprKind::Repeat(element, count) => { |
| try_visit!(visitor.visit_expr(element)); |
| try_visit!(visitor.visit_anon_const(count)); |
| } |
| ExprKind::Struct(se) => { |
| let StructExpr { qself, path, fields, rest } = &**se; |
| try_visit!(walk_qself(visitor, qself)); |
| try_visit!(visitor.visit_path(path, *id)); |
| walk_list!(visitor, visit_expr_field, fields); |
| match rest { |
| StructRest::Base(expr) => try_visit!(visitor.visit_expr(expr)), |
| StructRest::Rest(_span) => {} |
| StructRest::None => {} |
| } |
| } |
| ExprKind::Tup(subexpressions) => { |
| walk_list!(visitor, visit_expr, subexpressions); |
| } |
| ExprKind::Call(callee_expression, arguments) => { |
| try_visit!(visitor.visit_expr(callee_expression)); |
| walk_list!(visitor, visit_expr, arguments); |
| } |
| ExprKind::MethodCall(box MethodCall { seg, receiver, args, span: _ }) => { |
| try_visit!(visitor.visit_expr(receiver)); |
| try_visit!(visitor.visit_path_segment(seg)); |
| walk_list!(visitor, visit_expr, args); |
| } |
| ExprKind::Binary(_op, left_expression, right_expression) => { |
| try_visit!(visitor.visit_expr(left_expression)); |
| try_visit!(visitor.visit_expr(right_expression)); |
| } |
| ExprKind::AddrOf(_kind, _mutbl, subexpression) => { |
| try_visit!(visitor.visit_expr(subexpression)); |
| } |
| ExprKind::Unary(_op, subexpression) => { |
| try_visit!(visitor.visit_expr(subexpression)); |
| } |
| ExprKind::Cast(subexpression, typ) | ExprKind::Type(subexpression, typ) => { |
| try_visit!(visitor.visit_expr(subexpression)); |
| try_visit!(visitor.visit_ty(typ)); |
| } |
| ExprKind::Let(pat, expr, _span, _recovered) => { |
| try_visit!(visitor.visit_pat(pat)); |
| try_visit!(visitor.visit_expr(expr)); |
| } |
| ExprKind::If(head_expression, if_block, optional_else) => { |
| try_visit!(visitor.visit_expr(head_expression)); |
| try_visit!(visitor.visit_block(if_block)); |
| visit_opt!(visitor, visit_expr, optional_else); |
| } |
| ExprKind::While(subexpression, block, opt_label) => { |
| visit_opt!(visitor, visit_label, opt_label); |
| try_visit!(visitor.visit_expr(subexpression)); |
| try_visit!(visitor.visit_block(block)); |
| } |
| ExprKind::ForLoop { pat, iter, body, label, kind: _ } => { |
| visit_opt!(visitor, visit_label, label); |
| try_visit!(visitor.visit_pat(pat)); |
| try_visit!(visitor.visit_expr(iter)); |
| try_visit!(visitor.visit_block(body)); |
| } |
| ExprKind::Loop(block, opt_label, _span) => { |
| visit_opt!(visitor, visit_label, opt_label); |
| try_visit!(visitor.visit_block(block)); |
| } |
| ExprKind::Match(subexpression, arms, _kind) => { |
| try_visit!(visitor.visit_expr(subexpression)); |
| walk_list!(visitor, visit_arm, arms); |
| } |
| ExprKind::Closure(box Closure { |
| binder, |
| capture_clause, |
| coroutine_kind, |
| constness: _, |
| movability: _, |
| fn_decl, |
| body, |
| fn_decl_span: _, |
| fn_arg_span: _, |
| }) => { |
| try_visit!(visitor.visit_capture_by(capture_clause)); |
| try_visit!(visitor.visit_fn( |
| FnKind::Closure(binder, coroutine_kind, fn_decl, body), |
| *span, |
| *id |
| )) |
| } |
| ExprKind::Block(block, opt_label) => { |
| visit_opt!(visitor, visit_label, opt_label); |
| try_visit!(visitor.visit_block(block)); |
| } |
| ExprKind::Gen(_capt, body, _kind, _decl_span) => try_visit!(visitor.visit_block(body)), |
| ExprKind::Await(expr, _span) => try_visit!(visitor.visit_expr(expr)), |
| ExprKind::Assign(lhs, rhs, _span) => { |
| try_visit!(visitor.visit_expr(lhs)); |
| try_visit!(visitor.visit_expr(rhs)); |
| } |
| ExprKind::AssignOp(_op, left_expression, right_expression) => { |
| try_visit!(visitor.visit_expr(left_expression)); |
| try_visit!(visitor.visit_expr(right_expression)); |
| } |
| ExprKind::Field(subexpression, ident) => { |
| try_visit!(visitor.visit_expr(subexpression)); |
| try_visit!(visitor.visit_ident(*ident)); |
| } |
| ExprKind::Index(main_expression, index_expression, _span) => { |
| try_visit!(visitor.visit_expr(main_expression)); |
| try_visit!(visitor.visit_expr(index_expression)); |
| } |
| ExprKind::Range(start, end, _limit) => { |
| visit_opt!(visitor, visit_expr, start); |
| visit_opt!(visitor, visit_expr, end); |
| } |
| ExprKind::Underscore => {} |
| ExprKind::Path(maybe_qself, path) => { |
| try_visit!(walk_qself(visitor, maybe_qself)); |
| try_visit!(visitor.visit_path(path, *id)); |
| } |
| ExprKind::Break(opt_label, opt_expr) => { |
| visit_opt!(visitor, visit_label, opt_label); |
| visit_opt!(visitor, visit_expr, opt_expr); |
| } |
| ExprKind::Continue(opt_label) => { |
| visit_opt!(visitor, visit_label, opt_label); |
| } |
| ExprKind::Ret(optional_expression) => { |
| visit_opt!(visitor, visit_expr, optional_expression); |
| } |
| ExprKind::Yeet(optional_expression) => { |
| visit_opt!(visitor, visit_expr, optional_expression); |
| } |
| ExprKind::Become(expr) => try_visit!(visitor.visit_expr(expr)), |
| ExprKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)), |
| ExprKind::Paren(subexpression) => try_visit!(visitor.visit_expr(subexpression)), |
| ExprKind::InlineAsm(asm) => try_visit!(visitor.visit_inline_asm(asm)), |
| ExprKind::FormatArgs(f) => try_visit!(visitor.visit_format_args(f)), |
| ExprKind::OffsetOf(container, fields) => { |
| try_visit!(visitor.visit_ty(container)); |
| walk_list!(visitor, visit_ident, fields.iter().copied()); |
| } |
| ExprKind::Yield(optional_expression) => { |
| visit_opt!(visitor, visit_expr, optional_expression); |
| } |
| ExprKind::Try(subexpression) => try_visit!(visitor.visit_expr(subexpression)), |
| ExprKind::TryBlock(body) => try_visit!(visitor.visit_block(body)), |
| ExprKind::Lit(_token) => {} |
| ExprKind::IncludedBytes(_bytes) => {} |
| ExprKind::Err(_guar) => {} |
| ExprKind::Dummy => {} |
| } |
| |
| visitor.visit_expr_post(expression) |
| } |
| |
| pub fn walk_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a Param) -> V::Result { |
| let Param { attrs, ty, pat, id: _, span: _, is_placeholder: _ } = param; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_pat(pat)); |
| try_visit!(visitor.visit_ty(ty)); |
| V::Result::output() |
| } |
| |
| pub fn walk_arm<'a, V: Visitor<'a>>(visitor: &mut V, arm: &'a Arm) -> V::Result { |
| let Arm { attrs, pat, guard, body, span: _, id: _, is_placeholder: _ } = arm; |
| walk_list!(visitor, visit_attribute, attrs); |
| try_visit!(visitor.visit_pat(pat)); |
| visit_opt!(visitor, visit_expr, guard); |
| visit_opt!(visitor, visit_expr, body); |
| V::Result::output() |
| } |
| |
| pub fn walk_vis<'a, V: Visitor<'a>>(visitor: &mut V, vis: &'a Visibility) -> V::Result { |
| let Visibility { kind, span: _, tokens: _ } = vis; |
| match kind { |
| VisibilityKind::Restricted { path, id, shorthand: _ } => { |
| try_visit!(visitor.visit_path(path, *id)); |
| } |
| VisibilityKind::Public | VisibilityKind::Inherited => {} |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_attribute<'a, V: Visitor<'a>>(visitor: &mut V, attr: &'a Attribute) -> V::Result { |
| let Attribute { kind, id: _, style: _, span: _ } = attr; |
| match kind { |
| AttrKind::Normal(normal) => { |
| let NormalAttr { item, tokens: _ } = &**normal; |
| let AttrItem { unsafety: _, path, args, tokens: _ } = item; |
| try_visit!(visitor.visit_path(path, DUMMY_NODE_ID)); |
| try_visit!(walk_attr_args(visitor, args)); |
| } |
| AttrKind::DocComment(_kind, _sym) => {} |
| } |
| V::Result::output() |
| } |
| |
| pub fn walk_attr_args<'a, V: Visitor<'a>>(visitor: &mut V, args: &'a AttrArgs) -> V::Result { |
| match args { |
| AttrArgs::Empty => {} |
| AttrArgs::Delimited(_args) => {} |
| AttrArgs::Eq(_eq_span, AttrArgsEq::Ast(expr)) => try_visit!(visitor.visit_expr(expr)), |
| AttrArgs::Eq(_eq_span, AttrArgsEq::Hir(lit)) => { |
| unreachable!("in literal form when walking mac args eq: {:?}", lit) |
| } |
| } |
| V::Result::output() |
| } |
