| //! 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 crate::ast::*; |
| use crate::ptr::P; |
| use crate::token::{self, Token}; |
| use crate::tokenstream::*; |
| |
| use rustc_data_structures::flat_map_in_place::FlatMapInPlace; |
| use rustc_data_structures::stack::ensure_sufficient_stack; |
| use rustc_data_structures::sync::Lrc; |
| use rustc_span::source_map::Spanned; |
| use rustc_span::symbol::Ident; |
| use rustc_span::Span; |
| use smallvec::{smallvec, Array, SmallVec}; |
| use std::ops::DerefMut; |
| use std::{panic, ptr}; |
| use thin_vec::ThinVec; |
| |
| 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 NoopVisitItemKind { |
| fn noop_visit(&mut self, visitor: &mut impl MutVisitor); |
| } |
| |
| pub trait MutVisitor: Sized { |
| /// Mutable token visiting only exists for the `macro_rules` token marker and should not be |
| /// used otherwise. Token visitor would be entirely separate from the regular visitor if |
| /// the marker didn't have to visit AST fragments in nonterminal tokens. |
| const VISIT_TOKENS: bool = false; |
| |
| // 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 |
| // |
| // Any additions to this trait should happen in form of a call to a public |
| // `noop_*` function that only calls out to the visitor again, not other |
| // `noop_*` functions. This is a necessary API workaround to the problem of |
| // not being able to call out to the super default method in an overridden |
| // default method. |
| // |
| // 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) { |
| noop_visit_crate(c, self) |
| } |
| |
| fn visit_meta_list_item(&mut self, list_item: &mut NestedMetaItem) { |
| noop_visit_meta_list_item(list_item, self); |
| } |
| |
| fn visit_meta_item(&mut self, meta_item: &mut MetaItem) { |
| noop_visit_meta_item(meta_item, self); |
| } |
| |
| fn visit_use_tree(&mut self, use_tree: &mut UseTree) { |
| noop_visit_use_tree(use_tree, self); |
| } |
| |
| fn flat_map_foreign_item(&mut self, ni: P<ForeignItem>) -> SmallVec<[P<ForeignItem>; 1]> { |
| noop_flat_map_item(ni, self) |
| } |
| |
| fn flat_map_item(&mut self, i: P<Item>) -> SmallVec<[P<Item>; 1]> { |
| noop_flat_map_item(i, self) |
| } |
| |
| fn visit_fn_header(&mut self, header: &mut FnHeader) { |
| noop_visit_fn_header(header, self); |
| } |
| |
| fn flat_map_field_def(&mut self, fd: FieldDef) -> SmallVec<[FieldDef; 1]> { |
| noop_flat_map_field_def(fd, self) |
| } |
| |
| fn flat_map_trait_item(&mut self, i: P<AssocItem>) -> SmallVec<[P<AssocItem>; 1]> { |
| noop_flat_map_item(i, self) |
| } |
| |
| fn flat_map_impl_item(&mut self, i: P<AssocItem>) -> SmallVec<[P<AssocItem>; 1]> { |
| noop_flat_map_item(i, self) |
| } |
| |
| fn visit_fn_decl(&mut self, d: &mut P<FnDecl>) { |
| noop_visit_fn_decl(d, self); |
| } |
| |
| fn visit_coroutine_kind(&mut self, a: &mut CoroutineKind) { |
| noop_visit_coroutine_kind(a, self); |
| } |
| |
| fn visit_closure_binder(&mut self, b: &mut ClosureBinder) { |
| noop_visit_closure_binder(b, self); |
| } |
| |
| fn visit_block(&mut self, b: &mut P<Block>) { |
| noop_visit_block(b, self); |
| } |
| |
| fn flat_map_stmt(&mut self, s: Stmt) -> SmallVec<[Stmt; 1]> { |
| noop_flat_map_stmt(s, self) |
| } |
| |
| fn flat_map_arm(&mut self, arm: Arm) -> SmallVec<[Arm; 1]> { |
| noop_flat_map_arm(arm, self) |
| } |
| |
| fn visit_pat(&mut self, p: &mut P<Pat>) { |
| noop_visit_pat(p, self); |
| } |
| |
| fn visit_anon_const(&mut self, c: &mut AnonConst) { |
| noop_visit_anon_const(c, self); |
| } |
| |
| fn visit_expr(&mut self, e: &mut P<Expr>) { |
| noop_visit_expr(e, self); |
| } |
| |
| /// 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>> { |
| noop_filter_map_expr(e, self) |
| } |
| |
| fn visit_generic_arg(&mut self, arg: &mut GenericArg) { |
| noop_visit_generic_arg(arg, self); |
| } |
| |
| fn visit_ty(&mut self, t: &mut P<Ty>) { |
| noop_visit_ty(t, self); |
| } |
| |
| fn visit_lifetime(&mut self, l: &mut Lifetime) { |
| noop_visit_lifetime(l, self); |
| } |
| |
| fn visit_assoc_item_constraint(&mut self, c: &mut AssocItemConstraint) { |
| noop_visit_assoc_item_constraint(c, self); |
| } |
| |
| fn visit_foreign_mod(&mut self, nm: &mut ForeignMod) { |
| noop_visit_foreign_mod(nm, self); |
| } |
| |
| fn flat_map_variant(&mut self, v: Variant) -> SmallVec<[Variant; 1]> { |
| noop_flat_map_variant(v, self) |
| } |
| |
| fn visit_ident(&mut self, i: &mut Ident) { |
| noop_visit_ident(i, self); |
| } |
| |
| fn visit_path(&mut self, p: &mut Path) { |
| noop_visit_path(p, self); |
| } |
| |
| fn visit_qself(&mut self, qs: &mut Option<P<QSelf>>) { |
| noop_visit_qself(qs, self); |
| } |
| |
| fn visit_generic_args(&mut self, p: &mut GenericArgs) { |
| noop_visit_generic_args(p, self); |
| } |
| |
| fn visit_angle_bracketed_parameter_data(&mut self, p: &mut AngleBracketedArgs) { |
| noop_visit_angle_bracketed_parameter_data(p, self); |
| } |
| |
| fn visit_parenthesized_parameter_data(&mut self, p: &mut ParenthesizedArgs) { |
| noop_visit_parenthesized_parameter_data(p, self); |
| } |
| |
| fn visit_local(&mut self, l: &mut P<Local>) { |
| noop_visit_local(l, self); |
| } |
| |
| fn visit_mac_call(&mut self, mac: &mut MacCall) { |
| noop_visit_mac(mac, self); |
| } |
| |
| fn visit_macro_def(&mut self, def: &mut MacroDef) { |
| noop_visit_macro_def(def, self); |
| } |
| |
| fn visit_label(&mut self, label: &mut Label) { |
| noop_visit_label(label, self); |
| } |
| |
| fn visit_attribute(&mut self, at: &mut Attribute) { |
| noop_visit_attribute(at, self); |
| } |
| |
| fn flat_map_param(&mut self, param: Param) -> SmallVec<[Param; 1]> { |
| noop_flat_map_param(param, self) |
| } |
| |
| fn visit_generics(&mut self, generics: &mut Generics) { |
| noop_visit_generics(generics, self); |
| } |
| |
| fn visit_trait_ref(&mut self, tr: &mut TraitRef) { |
| noop_visit_trait_ref(tr, self); |
| } |
| |
| fn visit_poly_trait_ref(&mut self, p: &mut PolyTraitRef) { |
| noop_visit_poly_trait_ref(p, self); |
| } |
| |
| fn visit_variant_data(&mut self, vdata: &mut VariantData) { |
| noop_visit_variant_data(vdata, self); |
| } |
| |
| fn flat_map_generic_param(&mut self, param: GenericParam) -> SmallVec<[GenericParam; 1]> { |
| noop_flat_map_generic_param(param, self) |
| } |
| |
| fn visit_param_bound(&mut self, tpb: &mut GenericBound) { |
| noop_visit_param_bound(tpb, self); |
| } |
| |
| fn visit_precise_capturing_arg(&mut self, arg: &mut PreciseCapturingArg) { |
| noop_visit_precise_capturing_arg(arg, self); |
| } |
| |
| fn visit_mt(&mut self, mt: &mut MutTy) { |
| noop_visit_mt(mt, self); |
| } |
| |
| fn flat_map_expr_field(&mut self, f: ExprField) -> SmallVec<[ExprField; 1]> { |
| noop_flat_map_expr_field(f, self) |
| } |
| |
| fn visit_where_clause(&mut self, where_clause: &mut WhereClause) { |
| noop_visit_where_clause(where_clause, self); |
| } |
| |
| fn visit_where_predicate(&mut self, where_predicate: &mut WherePredicate) { |
| noop_visit_where_predicate(where_predicate, self); |
| } |
| |
| fn visit_vis(&mut self, vis: &mut Visibility) { |
| noop_visit_vis(vis, self); |
| } |
| |
| fn visit_id(&mut self, _id: &mut NodeId) { |
| // Do nothing. |
| } |
| |
| fn visit_span(&mut self, _sp: &mut Span) { |
| // Do nothing. |
| } |
| |
| fn flat_map_pat_field(&mut self, fp: PatField) -> SmallVec<[PatField; 1]> { |
| noop_flat_map_pat_field(fp, self) |
| } |
| |
| fn visit_inline_asm(&mut self, asm: &mut InlineAsm) { |
| noop_visit_inline_asm(asm, self) |
| } |
| |
| fn visit_inline_asm_sym(&mut self, sym: &mut InlineAsmSym) { |
| noop_visit_inline_asm_sym(sym, self) |
| } |
| |
| fn visit_format_args(&mut self, fmt: &mut FormatArgs) { |
| noop_visit_format_args(fmt, self) |
| } |
| |
| fn visit_capture_by(&mut self, capture_by: &mut CaptureBy) { |
| noop_visit_capture_by(capture_by, self) |
| } |
| } |
| |
| /// Use a map-style function (`FnOnce(T) -> T`) to overwrite a `&mut T`. Useful |
| /// when using a `flat_map_*` or `filter_map_*` method within a `visit_` |
| /// method. |
| // |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| pub fn visit_clobber<T: DummyAstNode>(t: &mut T, f: impl FnOnce(T) -> T) { |
| unsafe { |
| // Safe because `t` is used in a read-only fashion by `read()` before |
| // being overwritten by `write()`. |
| let old_t = ptr::read(t); |
| let new_t = |
| panic::catch_unwind(panic::AssertUnwindSafe(|| f(old_t))).unwrap_or_else(|err| { |
| // Set `t` to some valid but possible meaningless value, |
| // and pass the fatal error further. |
| ptr::write(t, T::dummy()); |
| panic::resume_unwind(err); |
| }); |
| ptr::write(t, new_t); |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `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); |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| #[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); |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| #[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); |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_attrs<T: MutVisitor>(attrs: &mut AttrVec, vis: &mut T) { |
| for attr in attrs.iter_mut() { |
| vis.visit_attribute(attr); |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| #[allow(unused)] |
| fn visit_exprs<T: MutVisitor>(exprs: &mut Vec<P<Expr>>, vis: &mut T) { |
| exprs.flat_map_in_place(|expr| vis.filter_map_expr(expr)) |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_thin_exprs<T: MutVisitor>(exprs: &mut ThinVec<P<Expr>>, vis: &mut T) { |
| exprs.flat_map_in_place(|expr| vis.filter_map_expr(expr)) |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_bounds<T: MutVisitor>(bounds: &mut GenericBounds, vis: &mut T) { |
| visit_vec(bounds, |bound| vis.visit_param_bound(bound)); |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_fn_sig<T: MutVisitor>(FnSig { header, decl, span }: &mut FnSig, vis: &mut T) { |
| vis.visit_fn_header(header); |
| vis.visit_fn_decl(decl); |
| vis.visit_span(span); |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_attr_args<T: MutVisitor>(args: &mut AttrArgs, vis: &mut T) { |
| match args { |
| AttrArgs::Empty => {} |
| AttrArgs::Delimited(args) => visit_delim_args(args, vis), |
| AttrArgs::Eq(eq_span, AttrArgsEq::Ast(expr)) => { |
| vis.visit_span(eq_span); |
| vis.visit_expr(expr); |
| } |
| AttrArgs::Eq(_, AttrArgsEq::Hir(lit)) => { |
| unreachable!("in literal form when visiting mac args eq: {:?}", lit) |
| } |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_delim_args<T: MutVisitor>(args: &mut DelimArgs, vis: &mut T) { |
| let DelimArgs { dspan, delim: _, tokens } = args; |
| visit_delim_span(dspan, vis); |
| visit_tts(tokens, vis); |
| } |
| |
| pub fn visit_delim_span<T: MutVisitor>(dspan: &mut DelimSpan, vis: &mut T) { |
| vis.visit_span(&mut dspan.open); |
| vis.visit_span(&mut dspan.close); |
| } |
| |
| pub fn noop_flat_map_pat_field<T: MutVisitor>( |
| mut fp: PatField, |
| vis: &mut T, |
| ) -> SmallVec<[PatField; 1]> { |
| let PatField { attrs, id, ident, is_placeholder: _, is_shorthand: _, pat, span } = &mut fp; |
| vis.visit_id(id); |
| vis.visit_ident(ident); |
| vis.visit_pat(pat); |
| vis.visit_span(span); |
| visit_attrs(attrs, vis); |
| smallvec![fp] |
| } |
| |
| fn noop_visit_use_tree<T: MutVisitor>(use_tree: &mut UseTree, vis: &mut T) { |
| 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, .. } => { |
| for (tree, id) in items { |
| vis.visit_use_tree(tree); |
| vis.visit_id(id); |
| } |
| } |
| UseTreeKind::Glob => {} |
| } |
| vis.visit_span(span); |
| } |
| |
| pub fn noop_flat_map_arm<T: MutVisitor>(mut arm: Arm, vis: &mut T) -> SmallVec<[Arm; 1]> { |
| let Arm { attrs, pat, guard, body, span, id, is_placeholder: _ } = &mut arm; |
| visit_attrs(attrs, vis); |
| vis.visit_id(id); |
| vis.visit_pat(pat); |
| visit_opt(guard, |guard| vis.visit_expr(guard)); |
| visit_opt(body, |body| vis.visit_expr(body)); |
| vis.visit_span(span); |
| smallvec![arm] |
| } |
| |
| fn noop_visit_assoc_item_constraint<T: MutVisitor>( |
| AssocItemConstraint { id, ident, gen_args, kind, span }: &mut AssocItemConstraint, |
| vis: &mut T, |
| ) { |
| 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(bounds, vis), |
| } |
| vis.visit_span(span); |
| } |
| |
| pub fn noop_visit_ty<T: MutVisitor>(ty: &mut P<Ty>, vis: &mut T) { |
| let Ty { id, kind, span, tokens } = ty.deref_mut(); |
| vis.visit_id(id); |
| match kind { |
| TyKind::Infer |
| | TyKind::ImplicitSelf |
| | TyKind::Err(_) |
| | TyKind::Dummy |
| | TyKind::Never |
| | TyKind::CVarArgs => {} |
| TyKind::Slice(ty) => vis.visit_ty(ty), |
| TyKind::Ptr(mt) => vis.visit_mt(mt), |
| TyKind::Ref(lt, mt) => { |
| visit_opt(lt, |lt| noop_visit_lifetime(lt, vis)); |
| vis.visit_mt(mt); |
| } |
| TyKind::BareFn(bft) => { |
| let BareFnTy { safety, ext: _, generic_params, decl, decl_span } = bft.deref_mut(); |
| visit_safety(safety, vis); |
| generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param)); |
| vis.visit_fn_decl(decl); |
| vis.visit_span(decl_span); |
| } |
| TyKind::Tup(tys) => visit_thin_vec(tys, |ty| vis.visit_ty(ty)), |
| TyKind::Paren(ty) => vis.visit_ty(ty), |
| TyKind::Pat(ty, pat) => { |
| vis.visit_ty(ty); |
| vis.visit_pat(pat); |
| } |
| TyKind::Path(qself, path) => { |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| } |
| TyKind::Array(ty, length) => { |
| vis.visit_ty(ty); |
| vis.visit_anon_const(length); |
| } |
| TyKind::Typeof(expr) => vis.visit_anon_const(expr), |
| TyKind::TraitObject(bounds, _syntax) => { |
| visit_vec(bounds, |bound| vis.visit_param_bound(bound)) |
| } |
| TyKind::ImplTrait(id, bounds) => { |
| vis.visit_id(id); |
| visit_vec(bounds, |bound| vis.visit_param_bound(bound)); |
| } |
| TyKind::MacCall(mac) => vis.visit_mac_call(mac), |
| TyKind::AnonStruct(id, fields) | TyKind::AnonUnion(id, fields) => { |
| vis.visit_id(id); |
| fields.flat_map_in_place(|field| vis.flat_map_field_def(field)); |
| } |
| } |
| vis.visit_span(span); |
| visit_lazy_tts(tokens, vis); |
| } |
| |
| fn noop_visit_foreign_mod<T: MutVisitor>(foreign_mod: &mut ForeignMod, vis: &mut T) { |
| let ForeignMod { safety, abi: _, items } = foreign_mod; |
| visit_safety(safety, vis); |
| items.flat_map_in_place(|item| vis.flat_map_foreign_item(item)); |
| } |
| |
| pub fn noop_flat_map_variant<T: MutVisitor>( |
| mut variant: Variant, |
| visitor: &mut T, |
| ) -> SmallVec<[Variant; 1]> { |
| let Variant { ident, vis, attrs, id, data, disr_expr, span, is_placeholder: _ } = &mut variant; |
| visitor.visit_ident(ident); |
| visitor.visit_vis(vis); |
| visit_attrs(attrs, visitor); |
| visitor.visit_id(id); |
| visitor.visit_variant_data(data); |
| visit_opt(disr_expr, |disr_expr| visitor.visit_anon_const(disr_expr)); |
| visitor.visit_span(span); |
| smallvec![variant] |
| } |
| |
| fn noop_visit_ident<T: MutVisitor>(Ident { name: _, span }: &mut Ident, vis: &mut T) { |
| vis.visit_span(span); |
| } |
| |
| fn noop_visit_path<T: MutVisitor>(Path { segments, span, tokens }: &mut Path, vis: &mut T) { |
| vis.visit_span(span); |
| for PathSegment { ident, id, args } in segments { |
| vis.visit_ident(ident); |
| vis.visit_id(id); |
| visit_opt(args, |args| vis.visit_generic_args(args)); |
| } |
| visit_lazy_tts(tokens, vis); |
| } |
| |
| fn noop_visit_qself<T: MutVisitor>(qself: &mut Option<P<QSelf>>, vis: &mut T) { |
| visit_opt(qself, |qself| { |
| let QSelf { ty, path_span, position: _ } = &mut **qself; |
| vis.visit_ty(ty); |
| vis.visit_span(path_span); |
| }) |
| } |
| |
| fn noop_visit_generic_args<T: MutVisitor>(generic_args: &mut GenericArgs, vis: &mut T) { |
| match generic_args { |
| GenericArgs::AngleBracketed(data) => vis.visit_angle_bracketed_parameter_data(data), |
| GenericArgs::Parenthesized(data) => vis.visit_parenthesized_parameter_data(data), |
| } |
| } |
| |
| fn noop_visit_generic_arg<T: MutVisitor>(arg: &mut GenericArg, vis: &mut T) { |
| 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 noop_visit_angle_bracketed_parameter_data<T: MutVisitor>( |
| data: &mut AngleBracketedArgs, |
| vis: &mut T, |
| ) { |
| 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 noop_visit_parenthesized_parameter_data<T: MutVisitor>( |
| args: &mut ParenthesizedArgs, |
| vis: &mut T, |
| ) { |
| let ParenthesizedArgs { inputs, output, span, .. } = args; |
| visit_thin_vec(inputs, |input| vis.visit_ty(input)); |
| noop_visit_fn_ret_ty(output, vis); |
| vis.visit_span(span); |
| } |
| |
| fn noop_visit_local<T: MutVisitor>(local: &mut P<Local>, vis: &mut T) { |
| let Local { id, pat, ty, kind, span, colon_sp, attrs, tokens } = local.deref_mut(); |
| vis.visit_id(id); |
| 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); |
| } |
| } |
| vis.visit_span(span); |
| visit_opt(colon_sp, |sp| vis.visit_span(sp)); |
| visit_attrs(attrs, vis); |
| visit_lazy_tts(tokens, vis); |
| } |
| |
| fn noop_visit_attribute<T: MutVisitor>(attr: &mut Attribute, vis: &mut T) { |
| let Attribute { kind, id: _, style: _, span } = attr; |
| match kind { |
| AttrKind::Normal(normal) => { |
| let NormalAttr { |
| item: AttrItem { unsafety: _, path, args, tokens }, |
| tokens: attr_tokens, |
| } = &mut **normal; |
| vis.visit_path(path); |
| visit_attr_args(args, vis); |
| visit_lazy_tts(tokens, vis); |
| visit_lazy_tts(attr_tokens, vis); |
| } |
| AttrKind::DocComment(..) => {} |
| } |
| vis.visit_span(span); |
| } |
| |
| fn noop_visit_mac<T: MutVisitor>(mac: &mut MacCall, vis: &mut T) { |
| let MacCall { path, args } = mac; |
| vis.visit_path(path); |
| visit_delim_args(args, vis); |
| } |
| |
| fn noop_visit_macro_def<T: MutVisitor>(macro_def: &mut MacroDef, vis: &mut T) { |
| let MacroDef { body, macro_rules: _ } = macro_def; |
| visit_delim_args(body, vis); |
| } |
| |
| fn noop_visit_meta_list_item<T: MutVisitor>(li: &mut NestedMetaItem, vis: &mut T) { |
| match li { |
| NestedMetaItem::MetaItem(mi) => vis.visit_meta_item(mi), |
| NestedMetaItem::Lit(_lit) => {} |
| } |
| } |
| |
| fn noop_visit_meta_item<T: MutVisitor>(mi: &mut MetaItem, vis: &mut T) { |
| 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 noop_flat_map_param<T: MutVisitor>(mut param: Param, vis: &mut T) -> SmallVec<[Param; 1]> { |
| let Param { attrs, id, pat, span, ty, is_placeholder: _ } = &mut param; |
| vis.visit_id(id); |
| visit_attrs(attrs, vis); |
| vis.visit_pat(pat); |
| vis.visit_span(span); |
| vis.visit_ty(ty); |
| smallvec![param] |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_attr_tt<T: MutVisitor>(tt: &mut AttrTokenTree, vis: &mut T) { |
| match tt { |
| AttrTokenTree::Token(token, _) => { |
| visit_token(token, vis); |
| } |
| AttrTokenTree::Delimited(DelimSpan { open, close }, _spacing, _delim, tts) => { |
| vis.visit_span(open); |
| vis.visit_span(close); |
| visit_attr_tts(tts, vis); |
| } |
| AttrTokenTree::Attributes(data) => { |
| for attr in &mut *data.attrs { |
| match &mut attr.kind { |
| AttrKind::Normal(normal) => { |
| visit_lazy_tts(&mut normal.tokens, vis); |
| } |
| AttrKind::DocComment(..) => { |
| vis.visit_span(&mut attr.span); |
| } |
| } |
| } |
| visit_lazy_tts_opt_mut(Some(&mut data.tokens), vis); |
| } |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_tt<T: MutVisitor>(tt: &mut TokenTree, vis: &mut T) { |
| match tt { |
| TokenTree::Token(token, _) => { |
| visit_token(token, vis); |
| } |
| TokenTree::Delimited(DelimSpan { open, close }, _spacing, _delim, tts) => { |
| vis.visit_span(open); |
| vis.visit_span(close); |
| visit_tts(tts, vis); |
| } |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_tts<T: MutVisitor>(TokenStream(tts): &mut TokenStream, vis: &mut T) { |
| if T::VISIT_TOKENS && !tts.is_empty() { |
| let tts = Lrc::make_mut(tts); |
| visit_vec(tts, |tree| visit_tt(tree, vis)); |
| } |
| } |
| |
| fn visit_attr_tts<T: MutVisitor>(AttrTokenStream(tts): &mut AttrTokenStream, vis: &mut T) { |
| if T::VISIT_TOKENS && !tts.is_empty() { |
| let tts = Lrc::make_mut(tts); |
| visit_vec(tts, |tree| visit_attr_tt(tree, vis)); |
| } |
| } |
| |
| fn visit_lazy_tts_opt_mut<T: MutVisitor>(lazy_tts: Option<&mut LazyAttrTokenStream>, vis: &mut T) { |
| if T::VISIT_TOKENS { |
| if let Some(lazy_tts) = lazy_tts { |
| let mut tts = lazy_tts.to_attr_token_stream(); |
| visit_attr_tts(&mut tts, vis); |
| *lazy_tts = LazyAttrTokenStream::new(tts); |
| } |
| } |
| } |
| |
| fn visit_lazy_tts<T: MutVisitor>(lazy_tts: &mut Option<LazyAttrTokenStream>, vis: &mut T) { |
| visit_lazy_tts_opt_mut(lazy_tts.as_mut(), vis); |
| } |
| |
| /// Applies ident visitor if it's an ident; applies other visits to interpolated nodes. |
| /// In practice the ident part is not actually used by specific visitors right now, |
| /// but there's a test below checking that it works. |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| pub fn visit_token<T: MutVisitor>(t: &mut Token, vis: &mut T) { |
| let Token { kind, span } = t; |
| match kind { |
| token::Ident(name, _) | token::Lifetime(name) => { |
| let mut ident = Ident::new(*name, *span); |
| vis.visit_ident(&mut ident); |
| *name = ident.name; |
| *span = ident.span; |
| return; // Avoid visiting the span for the second time. |
| } |
| token::NtIdent(ident, _is_raw) => { |
| vis.visit_ident(ident); |
| } |
| token::NtLifetime(ident) => { |
| vis.visit_ident(ident); |
| } |
| token::Interpolated(nt) => { |
| let nt = Lrc::make_mut(nt); |
| visit_nonterminal(nt, vis); |
| } |
| _ => {} |
| } |
| vis.visit_span(span); |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| /// Applies the visitor to elements of interpolated nodes. |
| // |
| // N.B., this can occur only when applying a visitor to partially expanded |
| // code, where parsed pieces have gotten implanted ito *other* macro |
| // invocations. This is relevant for macro hygiene, but possibly not elsewhere. |
| // |
| // One problem here occurs because the types for flat_map_item, flat_map_stmt, |
| // etc., allow the visitor to return *multiple* items; this is a problem for the |
| // nodes here, because they insist on having exactly one piece. One solution |
| // would be to mangle the MutVisitor trait to include one-to-many and |
| // one-to-one versions of these entry points, but that would probably confuse a |
| // lot of people and help very few. Instead, I'm just going to put in dynamic |
| // checks. I think the performance impact of this will be pretty much |
| // nonexistent. The danger is that someone will apply a `MutVisitor` to a |
| // partially expanded node, and will be confused by the fact that their |
| // `flat_map_item` or `flat_map_stmt` isn't getting called on `NtItem` or `NtStmt` |
| // nodes. Hopefully they'll wind up reading this comment, and doing something |
| // appropriate. |
| // |
| // BTW, design choice: I considered just changing the type of, e.g., `NtItem` to |
| // contain multiple items, but decided against it when I looked at |
| // `parse_item_or_view_item` and tried to figure out what I would do with |
| // multiple items there.... |
| fn visit_nonterminal<T: MutVisitor>(nt: &mut token::Nonterminal, vis: &mut T) { |
| match nt { |
| token::NtItem(item) => visit_clobber(item, |item| { |
| // This is probably okay, because the only visitors likely to |
| // peek inside interpolated nodes will be renamings/markings, |
| // which map single items to single items. |
| vis.flat_map_item(item).expect_one("expected visitor to produce exactly one item") |
| }), |
| token::NtBlock(block) => vis.visit_block(block), |
| token::NtStmt(stmt) => visit_clobber(stmt, |stmt| { |
| // See reasoning above. |
| stmt.map(|stmt| { |
| vis.flat_map_stmt(stmt).expect_one("expected visitor to produce exactly one item") |
| }) |
| }), |
| token::NtPat(pat) => vis.visit_pat(pat), |
| token::NtExpr(expr) => vis.visit_expr(expr), |
| token::NtTy(ty) => vis.visit_ty(ty), |
| token::NtLiteral(expr) => vis.visit_expr(expr), |
| token::NtMeta(item) => { |
| let AttrItem { unsafety: _, path, args, tokens } = item.deref_mut(); |
| vis.visit_path(path); |
| visit_attr_args(args, vis); |
| visit_lazy_tts(tokens, vis); |
| } |
| token::NtPath(path) => vis.visit_path(path), |
| token::NtVis(visib) => vis.visit_vis(visib), |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_defaultness<T: MutVisitor>(defaultness: &mut Defaultness, vis: &mut T) { |
| match defaultness { |
| Defaultness::Default(span) => vis.visit_span(span), |
| Defaultness::Final => {} |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_safety<T: MutVisitor>(safety: &mut Safety, vis: &mut T) { |
| match safety { |
| Safety::Unsafe(span) => vis.visit_span(span), |
| Safety::Safe(span) => vis.visit_span(span), |
| Safety::Default => {} |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_polarity<T: MutVisitor>(polarity: &mut ImplPolarity, vis: &mut T) { |
| match polarity { |
| ImplPolarity::Positive => {} |
| ImplPolarity::Negative(span) => vis.visit_span(span), |
| } |
| } |
| |
| // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`. |
| fn visit_constness<T: MutVisitor>(constness: &mut Const, vis: &mut T) { |
| match constness { |
| Const::Yes(span) => vis.visit_span(span), |
| Const::No => {} |
| } |
| } |
| |
| fn noop_visit_closure_binder<T: MutVisitor>(binder: &mut ClosureBinder, vis: &mut T) { |
| match binder { |
| ClosureBinder::NotPresent => {} |
| ClosureBinder::For { span: _, generic_params } => { |
| generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param)); |
| } |
| } |
| } |
| |
| fn noop_visit_coroutine_kind<T: MutVisitor>(coroutine_kind: &mut CoroutineKind, vis: &mut T) { |
| match coroutine_kind { |
| CoroutineKind::Async { span, closure_id, return_impl_trait_id } |
| | CoroutineKind::Gen { span, closure_id, return_impl_trait_id } |
| | CoroutineKind::AsyncGen { span, closure_id, return_impl_trait_id } => { |
| vis.visit_span(span); |
| vis.visit_id(closure_id); |
| vis.visit_id(return_impl_trait_id); |
| } |
| } |
| } |
| |
| fn noop_visit_fn_decl<T: MutVisitor>(decl: &mut P<FnDecl>, vis: &mut T) { |
| let FnDecl { inputs, output } = decl.deref_mut(); |
| inputs.flat_map_in_place(|param| vis.flat_map_param(param)); |
| noop_visit_fn_ret_ty(output, vis); |
| } |
| |
| fn noop_visit_fn_ret_ty<T: MutVisitor>(fn_ret_ty: &mut FnRetTy, vis: &mut T) { |
| match fn_ret_ty { |
| FnRetTy::Default(span) => vis.visit_span(span), |
| FnRetTy::Ty(ty) => vis.visit_ty(ty), |
| } |
| } |
| |
| fn noop_visit_param_bound<T: MutVisitor>(pb: &mut GenericBound, vis: &mut T) { |
| match pb { |
| GenericBound::Trait(ty, _modifier) => vis.visit_poly_trait_ref(ty), |
| GenericBound::Outlives(lifetime) => noop_visit_lifetime(lifetime, vis), |
| GenericBound::Use(args, _) => { |
| for arg in args { |
| vis.visit_precise_capturing_arg(arg); |
| } |
| } |
| } |
| } |
| |
| fn noop_visit_precise_capturing_arg<T: MutVisitor>(arg: &mut PreciseCapturingArg, vis: &mut T) { |
| match arg { |
| PreciseCapturingArg::Lifetime(lt) => { |
| vis.visit_lifetime(lt); |
| } |
| PreciseCapturingArg::Arg(path, id) => { |
| vis.visit_path(path); |
| vis.visit_id(id); |
| } |
| } |
| } |
| |
| pub fn noop_flat_map_generic_param<T: MutVisitor>( |
| mut param: GenericParam, |
| vis: &mut T, |
| ) -> SmallVec<[GenericParam; 1]> { |
| let GenericParam { id, ident, attrs, bounds, kind, colon_span, is_placeholder: _ } = &mut param; |
| vis.visit_id(id); |
| vis.visit_ident(ident); |
| if let Some(colon_span) = colon_span { |
| vis.visit_span(colon_span); |
| } |
| visit_attrs(attrs, vis); |
| visit_vec(bounds, |bound| noop_visit_param_bound(bound, vis)); |
| 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)); |
| } |
| } |
| smallvec![param] |
| } |
| |
| fn noop_visit_label<T: MutVisitor>(Label { ident }: &mut Label, vis: &mut T) { |
| vis.visit_ident(ident); |
| } |
| |
| fn noop_visit_lifetime<T: MutVisitor>(Lifetime { id, ident }: &mut Lifetime, vis: &mut T) { |
| vis.visit_id(id); |
| vis.visit_ident(ident); |
| } |
| |
| fn noop_visit_generics<T: MutVisitor>(generics: &mut Generics, vis: &mut T) { |
| 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 noop_visit_where_clause<T: MutVisitor>(wc: &mut WhereClause, vis: &mut T) { |
| let WhereClause { has_where_token: _, predicates, span } = wc; |
| visit_thin_vec(predicates, |predicate| vis.visit_where_predicate(predicate)); |
| vis.visit_span(span); |
| } |
| |
| fn noop_visit_where_predicate<T: MutVisitor>(pred: &mut WherePredicate, vis: &mut T) { |
| match pred { |
| WherePredicate::BoundPredicate(bp) => { |
| let WhereBoundPredicate { span, bound_generic_params, bounded_ty, bounds } = bp; |
| vis.visit_span(span); |
| 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)); |
| } |
| WherePredicate::RegionPredicate(rp) => { |
| let WhereRegionPredicate { span, lifetime, bounds } = rp; |
| vis.visit_span(span); |
| noop_visit_lifetime(lifetime, vis); |
| visit_vec(bounds, |bound| noop_visit_param_bound(bound, vis)); |
| } |
| WherePredicate::EqPredicate(ep) => { |
| let WhereEqPredicate { span, lhs_ty, rhs_ty } = ep; |
| vis.visit_span(span); |
| vis.visit_ty(lhs_ty); |
| vis.visit_ty(rhs_ty); |
| } |
| } |
| } |
| |
| fn noop_visit_variant_data<T: MutVisitor>(vdata: &mut VariantData, vis: &mut T) { |
| match vdata { |
| VariantData::Struct { fields, .. } => { |
| fields.flat_map_in_place(|field| vis.flat_map_field_def(field)); |
| } |
| VariantData::Tuple(fields, id) => { |
| fields.flat_map_in_place(|field| vis.flat_map_field_def(field)); |
| vis.visit_id(id); |
| } |
| VariantData::Unit(id) => vis.visit_id(id), |
| } |
| } |
| |
| fn noop_visit_trait_ref<T: MutVisitor>(TraitRef { path, ref_id }: &mut TraitRef, vis: &mut T) { |
| vis.visit_path(path); |
| vis.visit_id(ref_id); |
| } |
| |
| fn noop_visit_poly_trait_ref<T: MutVisitor>(p: &mut PolyTraitRef, vis: &mut T) { |
| let PolyTraitRef { bound_generic_params, trait_ref, span } = p; |
| bound_generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param)); |
| vis.visit_trait_ref(trait_ref); |
| vis.visit_span(span); |
| } |
| |
| pub fn noop_flat_map_field_def<T: MutVisitor>( |
| mut fd: FieldDef, |
| visitor: &mut T, |
| ) -> SmallVec<[FieldDef; 1]> { |
| let FieldDef { span, ident, vis, id, ty, attrs, is_placeholder: _ } = &mut fd; |
| visitor.visit_span(span); |
| visit_opt(ident, |ident| visitor.visit_ident(ident)); |
| visitor.visit_vis(vis); |
| visitor.visit_id(id); |
| visitor.visit_ty(ty); |
| visit_attrs(attrs, visitor); |
| smallvec![fd] |
| } |
| |
| pub fn noop_flat_map_expr_field<T: MutVisitor>( |
| mut f: ExprField, |
| vis: &mut T, |
| ) -> SmallVec<[ExprField; 1]> { |
| let ExprField { ident, expr, span, is_shorthand: _, attrs, id, is_placeholder: _ } = &mut f; |
| vis.visit_ident(ident); |
| vis.visit_expr(expr); |
| vis.visit_id(id); |
| vis.visit_span(span); |
| visit_attrs(attrs, vis); |
| smallvec![f] |
| } |
| |
| fn noop_visit_mt<T: MutVisitor>(MutTy { ty, mutbl: _ }: &mut MutTy, vis: &mut T) { |
| vis.visit_ty(ty); |
| } |
| |
| pub fn noop_visit_block<T: MutVisitor>(block: &mut P<Block>, vis: &mut T) { |
| let Block { id, stmts, rules: _, span, tokens, could_be_bare_literal: _ } = block.deref_mut(); |
| vis.visit_id(id); |
| stmts.flat_map_in_place(|stmt| vis.flat_map_stmt(stmt)); |
| vis.visit_span(span); |
| visit_lazy_tts(tokens, vis); |
| } |
| |
| pub fn noop_visit_item_kind(kind: &mut impl NoopVisitItemKind, vis: &mut impl MutVisitor) { |
| kind.noop_visit(vis) |
| } |
| |
| impl NoopVisitItemKind for ItemKind { |
| fn noop_visit(&mut self, vis: &mut impl MutVisitor) { |
| match self { |
| ItemKind::ExternCrate(_orig_name) => {} |
| ItemKind::Use(use_tree) => vis.visit_use_tree(use_tree), |
| ItemKind::Static(box StaticItem { ty, safety: _, mutability: _, expr }) => { |
| vis.visit_ty(ty); |
| visit_opt(expr, |expr| vis.visit_expr(expr)); |
| } |
| ItemKind::Const(item) => { |
| visit_const_item(item, vis); |
| } |
| ItemKind::Fn(box Fn { defaultness, generics, sig, body }) => { |
| visit_defaultness(defaultness, vis); |
| visit_fn_sig(sig, vis); |
| vis.visit_generics(generics); |
| visit_opt(body, |body| vis.visit_block(body)); |
| } |
| ItemKind::Mod(safety, mod_kind) => { |
| visit_safety(safety, vis); |
| match mod_kind { |
| ModKind::Loaded(items, _inline, ModSpans { inner_span, inject_use_span }) => { |
| vis.visit_span(inner_span); |
| vis.visit_span(inject_use_span); |
| items.flat_map_in_place(|item| vis.flat_map_item(item)); |
| } |
| ModKind::Unloaded => {} |
| } |
| } |
| ItemKind::ForeignMod(nm) => vis.visit_foreign_mod(nm), |
| ItemKind::GlobalAsm(asm) => vis.visit_inline_asm(asm), |
| ItemKind::TyAlias(box TyAlias { |
| defaultness, |
| generics, |
| where_clauses, |
| bounds, |
| ty, |
| .. |
| }) => { |
| visit_defaultness(defaultness, vis); |
| vis.visit_generics(generics); |
| vis.visit_span(&mut where_clauses.before.span); |
| vis.visit_span(&mut where_clauses.after.span); |
| visit_bounds(bounds, vis); |
| visit_opt(ty, |ty| vis.visit_ty(ty)); |
| } |
| ItemKind::Enum(EnumDef { variants }, generics) => { |
| variants.flat_map_in_place(|variant| vis.flat_map_variant(variant)); |
| vis.visit_generics(generics); |
| } |
| ItemKind::Struct(variant_data, generics) | ItemKind::Union(variant_data, generics) => { |
| vis.visit_variant_data(variant_data); |
| vis.visit_generics(generics); |
| } |
| ItemKind::Impl(box Impl { |
| defaultness, |
| safety, |
| generics, |
| constness, |
| polarity, |
| of_trait, |
| self_ty, |
| items, |
| }) => { |
| visit_defaultness(defaultness, vis); |
| visit_safety(safety, vis); |
| vis.visit_generics(generics); |
| visit_constness(constness, vis); |
| visit_polarity(polarity, vis); |
| visit_opt(of_trait, |trait_ref| vis.visit_trait_ref(trait_ref)); |
| vis.visit_ty(self_ty); |
| items.flat_map_in_place(|item| vis.flat_map_impl_item(item)); |
| } |
| ItemKind::Trait(box Trait { safety, is_auto: _, generics, bounds, items }) => { |
| visit_safety(safety, vis); |
| vis.visit_generics(generics); |
| visit_bounds(bounds, vis); |
| items.flat_map_in_place(|item| vis.flat_map_trait_item(item)); |
| } |
| ItemKind::TraitAlias(generics, bounds) => { |
| vis.visit_generics(generics); |
| visit_bounds(bounds, vis); |
| } |
| ItemKind::MacCall(m) => vis.visit_mac_call(m), |
| ItemKind::MacroDef(def) => vis.visit_macro_def(def), |
| ItemKind::Delegation(box Delegation { |
| id, |
| qself, |
| path, |
| rename, |
| body, |
| from_glob: _, |
| }) => { |
| vis.visit_id(id); |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| if let Some(rename) = rename { |
| vis.visit_ident(rename); |
| } |
| if let Some(body) = body { |
| vis.visit_block(body); |
| } |
| } |
| ItemKind::DelegationMac(box DelegationMac { qself, prefix, suffixes, body }) => { |
| vis.visit_qself(qself); |
| vis.visit_path(prefix); |
| if let Some(suffixes) = suffixes { |
| for (ident, rename) in suffixes { |
| vis.visit_ident(ident); |
| if let Some(rename) = rename { |
| vis.visit_ident(rename); |
| } |
| } |
| } |
| if let Some(body) = body { |
| vis.visit_block(body); |
| } |
| } |
| } |
| } |
| } |
| |
| impl NoopVisitItemKind for AssocItemKind { |
| fn noop_visit(&mut self, visitor: &mut impl MutVisitor) { |
| match self { |
| AssocItemKind::Const(item) => { |
| visit_const_item(item, visitor); |
| } |
| AssocItemKind::Fn(box Fn { defaultness, generics, sig, body }) => { |
| visit_defaultness(defaultness, visitor); |
| visitor.visit_generics(generics); |
| visit_fn_sig(sig, visitor); |
| visit_opt(body, |body| visitor.visit_block(body)); |
| } |
| AssocItemKind::Type(box TyAlias { |
| defaultness, |
| generics, |
| where_clauses, |
| bounds, |
| ty, |
| .. |
| }) => { |
| visit_defaultness(defaultness, visitor); |
| visitor.visit_generics(generics); |
| visitor.visit_span(&mut where_clauses.before.span); |
| visitor.visit_span(&mut where_clauses.after.span); |
| visit_bounds(bounds, visitor); |
| visit_opt(ty, |ty| visitor.visit_ty(ty)); |
| } |
| AssocItemKind::MacCall(mac) => visitor.visit_mac_call(mac), |
| AssocItemKind::Delegation(box Delegation { |
| id, |
| qself, |
| path, |
| rename, |
| body, |
| from_glob: _, |
| }) => { |
| visitor.visit_id(id); |
| visitor.visit_qself(qself); |
| visitor.visit_path(path); |
| if let Some(rename) = rename { |
| visitor.visit_ident(rename); |
| } |
| if let Some(body) = body { |
| visitor.visit_block(body); |
| } |
| } |
| AssocItemKind::DelegationMac(box DelegationMac { qself, prefix, suffixes, body }) => { |
| visitor.visit_qself(qself); |
| visitor.visit_path(prefix); |
| if let Some(suffixes) = suffixes { |
| for (ident, rename) in suffixes { |
| visitor.visit_ident(ident); |
| if let Some(rename) = rename { |
| visitor.visit_ident(rename); |
| } |
| } |
| } |
| if let Some(body) = body { |
| visitor.visit_block(body); |
| } |
| } |
| } |
| } |
| } |
| |
| fn visit_const_item<T: MutVisitor>( |
| ConstItem { defaultness, generics, ty, expr }: &mut ConstItem, |
| visitor: &mut T, |
| ) { |
| visit_defaultness(defaultness, visitor); |
| visitor.visit_generics(generics); |
| visitor.visit_ty(ty); |
| visit_opt(expr, |expr| visitor.visit_expr(expr)); |
| } |
| |
| fn noop_visit_fn_header<T: MutVisitor>(header: &mut FnHeader, vis: &mut T) { |
| let FnHeader { safety, coroutine_kind, constness, ext: _ } = header; |
| visit_constness(constness, vis); |
| coroutine_kind.as_mut().map(|coroutine_kind| vis.visit_coroutine_kind(coroutine_kind)); |
| visit_safety(safety, vis); |
| } |
| |
| pub fn noop_visit_crate<T: MutVisitor>(krate: &mut Crate, vis: &mut T) { |
| let Crate { attrs, items, spans, id, is_placeholder: _ } = krate; |
| vis.visit_id(id); |
| visit_attrs(attrs, vis); |
| 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); |
| } |
| |
| // Mutates one item into possibly many items. |
| pub fn noop_flat_map_item<K: NoopVisitItemKind>( |
| mut item: P<Item<K>>, |
| visitor: &mut impl MutVisitor, |
| ) -> SmallVec<[P<Item<K>>; 1]> { |
| let Item { ident, attrs, id, kind, vis, span, tokens } = item.deref_mut(); |
| visitor.visit_id(id); |
| visit_attrs(attrs, visitor); |
| visitor.visit_vis(vis); |
| visitor.visit_ident(ident); |
| kind.noop_visit(visitor); |
| visitor.visit_span(span); |
| visit_lazy_tts(tokens, visitor); |
| smallvec![item] |
| } |
| |
| impl NoopVisitItemKind for ForeignItemKind { |
| fn noop_visit(&mut self, visitor: &mut impl MutVisitor) { |
| match self { |
| ForeignItemKind::Static(box StaticItem { ty, mutability: _, expr, safety: _ }) => { |
| visitor.visit_ty(ty); |
| visit_opt(expr, |expr| visitor.visit_expr(expr)); |
| } |
| ForeignItemKind::Fn(box Fn { defaultness, generics, sig, body }) => { |
| visit_defaultness(defaultness, visitor); |
| visitor.visit_generics(generics); |
| visit_fn_sig(sig, visitor); |
| visit_opt(body, |body| visitor.visit_block(body)); |
| } |
| ForeignItemKind::TyAlias(box TyAlias { |
| defaultness, |
| generics, |
| where_clauses, |
| bounds, |
| ty, |
| .. |
| }) => { |
| visit_defaultness(defaultness, visitor); |
| visitor.visit_generics(generics); |
| visitor.visit_span(&mut where_clauses.before.span); |
| visitor.visit_span(&mut where_clauses.after.span); |
| visit_bounds(bounds, visitor); |
| visit_opt(ty, |ty| visitor.visit_ty(ty)); |
| } |
| ForeignItemKind::MacCall(mac) => visitor.visit_mac_call(mac), |
| } |
| } |
| } |
| |
| pub fn noop_visit_pat<T: MutVisitor>(pat: &mut P<Pat>, vis: &mut T) { |
| let Pat { id, kind, span, tokens } = pat.deref_mut(); |
| vis.visit_id(id); |
| match kind { |
| PatKind::Wild | PatKind::Rest | PatKind::Never | PatKind::Err(_) => {} |
| PatKind::Ident(_binding_mode, ident, sub) => { |
| vis.visit_ident(ident); |
| visit_opt(sub, |sub| vis.visit_pat(sub)); |
| } |
| PatKind::Lit(e) => vis.visit_expr(e), |
| PatKind::TupleStruct(qself, path, elems) => { |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| visit_thin_vec(elems, |elem| vis.visit_pat(elem)); |
| } |
| PatKind::Path(qself, path) => { |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| } |
| PatKind::Struct(qself, path, fields, _etc) => { |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| fields.flat_map_in_place(|field| vis.flat_map_pat_field(field)); |
| } |
| PatKind::Box(inner) => vis.visit_pat(inner), |
| PatKind::Deref(inner) => vis.visit_pat(inner), |
| PatKind::Ref(inner, _mutbl) => vis.visit_pat(inner), |
| PatKind::Range(e1, e2, Spanned { span: _, node: _ }) => { |
| visit_opt(e1, |e| vis.visit_expr(e)); |
| visit_opt(e2, |e| vis.visit_expr(e)); |
| vis.visit_span(span); |
| } |
| PatKind::Tuple(elems) | PatKind::Slice(elems) | PatKind::Or(elems) => { |
| visit_thin_vec(elems, |elem| vis.visit_pat(elem)) |
| } |
| PatKind::Paren(inner) => vis.visit_pat(inner), |
| PatKind::MacCall(mac) => vis.visit_mac_call(mac), |
| } |
| vis.visit_span(span); |
| visit_lazy_tts(tokens, vis); |
| } |
| |
| fn noop_visit_anon_const<T: MutVisitor>(AnonConst { id, value }: &mut AnonConst, vis: &mut T) { |
| vis.visit_id(id); |
| vis.visit_expr(value); |
| } |
| |
| fn noop_visit_inline_asm<T: MutVisitor>(asm: &mut InlineAsm, vis: &mut T) { |
| for (op, _) in &mut asm.operands { |
| match op { |
| InlineAsmOperand::In { expr, .. } |
| | InlineAsmOperand::Out { expr: Some(expr), .. } |
| | InlineAsmOperand::InOut { expr, .. } => vis.visit_expr(expr), |
| InlineAsmOperand::Out { expr: None, .. } => {} |
| InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => { |
| 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), |
| } |
| } |
| } |
| |
| fn noop_visit_inline_asm_sym<T: MutVisitor>( |
| InlineAsmSym { id, qself, path }: &mut InlineAsmSym, |
| vis: &mut T, |
| ) { |
| vis.visit_id(id); |
| vis.visit_qself(qself); |
| vis.visit_path(path); |
| } |
| |
| fn noop_visit_format_args<T: MutVisitor>(fmt: &mut FormatArgs, vis: &mut T) { |
| for arg in fmt.arguments.all_args_mut() { |
| if let FormatArgumentKind::Named(name) = &mut arg.kind { |
| vis.visit_ident(name); |
| } |
| vis.visit_expr(&mut arg.expr); |
| } |
| } |
| |
| pub fn noop_visit_expr<T: MutVisitor>( |
| Expr { kind, id, span, attrs, tokens }: &mut Expr, |
| vis: &mut T, |
| ) { |
| match kind { |
| ExprKind::Array(exprs) => visit_thin_exprs(exprs, vis), |
| 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(exprs, vis), |
| ExprKind::Call(f, args) => { |
| vis.visit_expr(f); |
| visit_thin_exprs(args, vis); |
| } |
| ExprKind::MethodCall(box MethodCall { |
| seg: PathSegment { ident, id, args: seg_args }, |
| receiver, |
| args: call_args, |
| span, |
| }) => { |
| vis.visit_ident(ident); |
| vis.visit_id(id); |
| visit_opt(seg_args, |args| vis.visit_generic_args(args)); |
| vis.visit_method_receiver_expr(receiver); |
| visit_thin_exprs(call_args, vis); |
| vis.visit_span(span); |
| } |
| ExprKind::Binary(_binop, lhs, rhs) => { |
| vis.visit_expr(lhs); |
| vis.visit_expr(rhs); |
| } |
| 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(_, _, ohs) => vis.visit_expr(ohs), |
| ExprKind::Let(pat, scrutinee, _, _) => { |
| vis.visit_pat(pat); |
| vis.visit_expr(scrutinee); |
| } |
| 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) => { |
| vis.visit_expr(cond); |
| vis.visit_block(body); |
| visit_opt(label, |label| vis.visit_label(label)); |
| } |
| ExprKind::ForLoop { pat, iter, body, label, kind: _ } => { |
| vis.visit_pat(pat); |
| vis.visit_expr(iter); |
| vis.visit_block(body); |
| visit_opt(label, |label| vis.visit_label(label)); |
| } |
| ExprKind::Loop(body, label, span) => { |
| vis.visit_block(body); |
| visit_opt(label, |label| vis.visit_label(label)); |
| 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, |
| }) => { |
| vis.visit_closure_binder(binder); |
| visit_constness(constness, vis); |
| coroutine_kind.as_mut().map(|coroutine_kind| vis.visit_coroutine_kind(coroutine_kind)); |
| vis.visit_capture_by(capture_clause); |
| vis.visit_fn_decl(fn_decl); |
| vis.visit_expr(body); |
| vis.visit_span(fn_decl_span); |
| vis.visit_span(fn_arg_span); |
| } |
| ExprKind::Block(blk, label) => { |
| vis.visit_block(blk); |
| visit_opt(label, |label| vis.visit_label(label)); |
| } |
| ExprKind::Gen(_capture_by, body, _) => { |
| vis.visit_block(body); |
| } |
| ExprKind::Await(expr, await_kw_span) => { |
| vis.visit_expr(expr); |
| vis.visit_span(await_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(expr) => { |
| visit_opt(expr, |expr| vis.visit_expr(expr)); |
| } |
| ExprKind::Try(expr) => vis.visit_expr(expr), |
| ExprKind::TryBlock(body) => vis.visit_block(body), |
| ExprKind::Lit(_) | ExprKind::IncludedBytes(..) | ExprKind::Err(_) | ExprKind::Dummy => {} |
| } |
| vis.visit_id(id); |
| vis.visit_span(span); |
| visit_attrs(attrs, vis); |
| visit_lazy_tts(tokens, vis); |
| } |
| |
| pub fn noop_filter_map_expr<T: MutVisitor>(mut e: P<Expr>, vis: &mut T) -> Option<P<Expr>> { |
| Some({ |
| vis.visit_expr(&mut e); |
| e |
| }) |
| } |
| |
| pub fn noop_flat_map_stmt<T: MutVisitor>( |
| Stmt { kind, mut span, mut id }: Stmt, |
| vis: &mut T, |
| ) -> SmallVec<[Stmt; 1]> { |
| vis.visit_id(&mut id); |
| vis.visit_span(&mut span); |
| let stmts: SmallVec<_> = noop_flat_map_stmt_kind(kind, vis) |
| .into_iter() |
| .map(|kind| Stmt { id, kind, span }) |
| .collect(); |
| if stmts.len() > 1 { |
| panic!( |
| "cloning statement `NodeId`s is prohibited by default, \ |
| the visitor should implement custom statement visiting" |
| ); |
| } |
| stmts |
| } |
| |
| fn noop_flat_map_stmt_kind<T: MutVisitor>(kind: StmtKind, vis: &mut T) -> 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(); |
| vis.visit_mac_call(mac_); |
| visit_attrs(attrs, vis); |
| visit_lazy_tts(tokens, vis); |
| smallvec![StmtKind::MacCall(mac)] |
| } |
| } |
| } |
| |
| fn noop_visit_vis<T: MutVisitor>(visibility: &mut Visibility, vis: &mut T) { |
| match &mut visibility.kind { |
| VisibilityKind::Public | VisibilityKind::Inherited => {} |
| VisibilityKind::Restricted { path, id, shorthand: _ } => { |
| vis.visit_path(path); |
| vis.visit_id(id); |
| } |
| } |
| vis.visit_span(&mut visibility.span); |
| } |
| |
| fn noop_visit_capture_by<T: MutVisitor>(capture_by: &mut CaptureBy, vis: &mut T) { |
| match capture_by { |
| CaptureBy::Ref => {} |
| CaptureBy::Value { move_kw } => { |
| vis.visit_span(move_kw); |
| } |
| } |
| } |
| |
| /// Some value for the AST node that is valid but possibly meaningless. Similar |
| /// to `Default` but not intended for wide use. The value will never be used |
| /// meaningfully, it exists just to support unwinding in `visit_clobber` in the |
| /// case where its closure panics. |
| pub trait DummyAstNode { |
| fn dummy() -> Self; |
| } |
| |
| impl<T> DummyAstNode for Option<T> { |
| fn dummy() -> Self { |
| Default::default() |
| } |
| } |
| |
| impl<T: DummyAstNode + 'static> DummyAstNode for P<T> { |
| fn dummy() -> Self { |
| P(DummyAstNode::dummy()) |
| } |
| } |
| |
| impl DummyAstNode for Item { |
| fn dummy() -> Self { |
| Item { |
| attrs: Default::default(), |
| id: DUMMY_NODE_ID, |
| span: Default::default(), |
| vis: Visibility { |
| kind: VisibilityKind::Public, |
| span: Default::default(), |
| tokens: Default::default(), |
| }, |
| ident: Ident::empty(), |
| kind: ItemKind::ExternCrate(None), |
| tokens: Default::default(), |
| } |
| } |
| } |
| |
| impl DummyAstNode for Expr { |
| fn dummy() -> Self { |
| Expr { |
| id: DUMMY_NODE_ID, |
| kind: ExprKind::Dummy, |
| span: Default::default(), |
| attrs: Default::default(), |
| tokens: Default::default(), |
| } |
| } |
| } |
| |
| impl DummyAstNode for Ty { |
| fn dummy() -> Self { |
| Ty { |
| id: DUMMY_NODE_ID, |
| kind: TyKind::Dummy, |
| span: Default::default(), |
| tokens: Default::default(), |
| } |
| } |
| } |
| |
| impl DummyAstNode for Pat { |
| fn dummy() -> Self { |
| Pat { |
| id: DUMMY_NODE_ID, |
| kind: PatKind::Wild, |
| span: Default::default(), |
| tokens: Default::default(), |
| } |
| } |
| } |
| |
| impl DummyAstNode for Stmt { |
| fn dummy() -> Self { |
| Stmt { id: DUMMY_NODE_ID, kind: StmtKind::Empty, span: Default::default() } |
| } |
| } |
| |
| impl DummyAstNode for Crate { |
| fn dummy() -> Self { |
| Crate { |
| attrs: Default::default(), |
| items: Default::default(), |
| spans: Default::default(), |
| id: DUMMY_NODE_ID, |
| is_placeholder: Default::default(), |
| } |
| } |
| } |
| |
| impl<N: DummyAstNode, T: DummyAstNode> DummyAstNode for crate::ast_traits::AstNodeWrapper<N, T> { |
| fn dummy() -> Self { |
| crate::ast_traits::AstNodeWrapper::new(N::dummy(), T::dummy()) |
| } |
| } |
