From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- compiler/rustc_ast/src/visit.rs | 959 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 959 insertions(+) create mode 100644 compiler/rustc_ast/src/visit.rs (limited to 'compiler/rustc_ast/src/visit.rs') diff --git a/compiler/rustc_ast/src/visit.rs b/compiler/rustc_ast/src/visit.rs new file mode 100644 index 000000000..d9594b323 --- /dev/null +++ b/compiler/rustc_ast/src/visit.rs @@ -0,0 +1,959 @@ +//! 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. + +use crate::ast::*; + +use rustc_span::symbol::Ident; +use rustc_span::Span; + +#[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., ``, `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, +} + +#[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 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 { + match self { + FnKind::Fn(ctxt, ..) => Some(*ctxt), + FnKind::Closure(..) => None, + } + } +} + +#[derive(Copy, Clone, Debug)] +pub enum LifetimeCtxt { + /// Appears in a reference type. + Rptr, + /// Appears as a bound on a type or another lifetime. + Bound, + /// Appears as a generic argument. + GenericArg, +} + +/// 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 { + fn visit_ident(&mut self, _ident: Ident) {} + fn visit_foreign_item(&mut self, i: &'ast ForeignItem) { + walk_foreign_item(self, i) + } + fn visit_item(&mut self, i: &'ast Item) { + walk_item(self, i) + } + fn visit_local(&mut self, l: &'ast Local) { + walk_local(self, l) + } + fn visit_block(&mut self, b: &'ast Block) { + walk_block(self, b) + } + fn visit_stmt(&mut self, s: &'ast Stmt) { + walk_stmt(self, s) + } + fn visit_param(&mut self, param: &'ast Param) { + walk_param(self, param) + } + fn visit_arm(&mut self, a: &'ast Arm) { + walk_arm(self, a) + } + fn visit_pat(&mut self, p: &'ast Pat) { + walk_pat(self, p) + } + fn visit_anon_const(&mut self, c: &'ast AnonConst) { + walk_anon_const(self, c) + } + fn visit_expr(&mut self, ex: &'ast Expr) { + walk_expr(self, ex) + } + fn visit_expr_post(&mut self, _ex: &'ast Expr) {} + fn visit_ty(&mut self, t: &'ast Ty) { + walk_ty(self, t) + } + fn visit_generic_param(&mut self, param: &'ast GenericParam) { + walk_generic_param(self, param) + } + fn visit_generics(&mut self, g: &'ast Generics) { + walk_generics(self, g) + } + fn visit_closure_binder(&mut self, b: &'ast ClosureBinder) { + walk_closure_binder(self, b) + } + fn visit_where_predicate(&mut self, p: &'ast WherePredicate) { + walk_where_predicate(self, p) + } + fn visit_fn(&mut self, fk: FnKind<'ast>, s: Span, _: NodeId) { + walk_fn(self, fk, s) + } + fn visit_assoc_item(&mut self, i: &'ast AssocItem, ctxt: AssocCtxt) { + walk_assoc_item(self, i, ctxt) + } + fn visit_trait_ref(&mut self, t: &'ast TraitRef) { + walk_trait_ref(self, t) + } + fn visit_param_bound(&mut self, bounds: &'ast GenericBound, _ctxt: BoundKind) { + walk_param_bound(self, bounds) + } + fn visit_poly_trait_ref(&mut self, t: &'ast PolyTraitRef, m: &'ast TraitBoundModifier) { + walk_poly_trait_ref(self, t, m) + } + fn visit_variant_data(&mut self, s: &'ast VariantData) { + walk_struct_def(self, s) + } + fn visit_field_def(&mut self, s: &'ast FieldDef) { + walk_field_def(self, s) + } + fn visit_enum_def( + &mut self, + enum_definition: &'ast EnumDef, + generics: &'ast Generics, + item_id: NodeId, + _: Span, + ) { + walk_enum_def(self, enum_definition, generics, item_id) + } + fn visit_variant(&mut self, v: &'ast Variant) { + walk_variant(self, v) + } + fn visit_label(&mut self, label: &'ast Label) { + walk_label(self, label) + } + fn visit_lifetime(&mut self, lifetime: &'ast Lifetime, _: LifetimeCtxt) { + walk_lifetime(self, lifetime) + } + fn visit_mac_call(&mut self, mac: &'ast MacCall) { + walk_mac(self, mac) + } + fn visit_mac_def(&mut self, _mac: &'ast MacroDef, _id: NodeId) { + // Nothing to do + } + fn visit_path(&mut self, path: &'ast Path, _id: NodeId) { + walk_path(self, path) + } + fn visit_use_tree(&mut self, use_tree: &'ast UseTree, id: NodeId, _nested: bool) { + walk_use_tree(self, use_tree, id) + } + fn visit_path_segment(&mut self, path_span: Span, path_segment: &'ast PathSegment) { + walk_path_segment(self, path_span, path_segment) + } + fn visit_generic_args(&mut self, path_span: Span, generic_args: &'ast GenericArgs) { + walk_generic_args(self, path_span, generic_args) + } + fn visit_generic_arg(&mut self, generic_arg: &'ast GenericArg) { + walk_generic_arg(self, generic_arg) + } + fn visit_assoc_constraint(&mut self, constraint: &'ast AssocConstraint) { + walk_assoc_constraint(self, constraint) + } + fn visit_attribute(&mut self, attr: &'ast Attribute) { + walk_attribute(self, attr) + } + fn visit_vis(&mut self, vis: &'ast Visibility) { + walk_vis(self, vis) + } + fn visit_fn_ret_ty(&mut self, ret_ty: &'ast FnRetTy) { + walk_fn_ret_ty(self, ret_ty) + } + fn visit_fn_header(&mut self, _header: &'ast FnHeader) { + // Nothing to do + } + fn visit_expr_field(&mut self, f: &'ast ExprField) { + walk_expr_field(self, f) + } + fn visit_pat_field(&mut self, fp: &'ast PatField) { + walk_pat_field(self, fp) + } + fn visit_crate(&mut self, krate: &'ast Crate) { + walk_crate(self, krate) + } + fn visit_inline_asm(&mut self, asm: &'ast InlineAsm) { + walk_inline_asm(self, asm) + } + fn visit_inline_asm_sym(&mut self, sym: &'ast InlineAsmSym) { + walk_inline_asm_sym(self, sym) + } +} + +#[macro_export] +macro_rules! walk_list { + ($visitor: expr, $method: ident, $list: expr) => { + for elem in $list { + $visitor.$method(elem) + } + }; + ($visitor: expr, $method: ident, $list: expr, $($extra_args: expr),*) => { + for elem in $list { + $visitor.$method(elem, $($extra_args,)*) + } + } +} + +pub fn walk_crate<'a, V: Visitor<'a>>(visitor: &mut V, krate: &'a Crate) { + walk_list!(visitor, visit_item, &krate.items); + walk_list!(visitor, visit_attribute, &krate.attrs); +} + +pub fn walk_local<'a, V: Visitor<'a>>(visitor: &mut V, local: &'a Local) { + for attr in local.attrs.iter() { + visitor.visit_attribute(attr); + } + visitor.visit_pat(&local.pat); + walk_list!(visitor, visit_ty, &local.ty); + if let Some((init, els)) = local.kind.init_else_opt() { + visitor.visit_expr(init); + walk_list!(visitor, visit_block, els); + } +} + +pub fn walk_label<'a, V: Visitor<'a>>(visitor: &mut V, label: &'a Label) { + visitor.visit_ident(label.ident); +} + +pub fn walk_lifetime<'a, V: Visitor<'a>>(visitor: &mut V, lifetime: &'a Lifetime) { + visitor.visit_ident(lifetime.ident); +} + +pub fn walk_poly_trait_ref<'a, V>( + visitor: &mut V, + trait_ref: &'a PolyTraitRef, + _: &TraitBoundModifier, +) where + V: Visitor<'a>, +{ + walk_list!(visitor, visit_generic_param, &trait_ref.bound_generic_params); + visitor.visit_trait_ref(&trait_ref.trait_ref); +} + +pub fn walk_trait_ref<'a, V: Visitor<'a>>(visitor: &mut V, trait_ref: &'a TraitRef) { + visitor.visit_path(&trait_ref.path, trait_ref.ref_id) +} + +pub fn walk_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a Item) { + visitor.visit_vis(&item.vis); + visitor.visit_ident(item.ident); + match item.kind { + ItemKind::ExternCrate(_) => {} + ItemKind::Use(ref use_tree) => visitor.visit_use_tree(use_tree, item.id, false), + ItemKind::Static(ref typ, _, ref expr) | ItemKind::Const(_, ref typ, ref expr) => { + visitor.visit_ty(typ); + walk_list!(visitor, visit_expr, expr); + } + ItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { + let kind = + FnKind::Fn(FnCtxt::Free, item.ident, sig, &item.vis, generics, body.as_deref()); + visitor.visit_fn(kind, item.span, item.id) + } + ItemKind::Mod(_unsafety, ref mod_kind) => match mod_kind { + ModKind::Loaded(items, _inline, _inner_span) => { + walk_list!(visitor, visit_item, items) + } + ModKind::Unloaded => {} + }, + ItemKind::ForeignMod(ref foreign_module) => { + walk_list!(visitor, visit_foreign_item, &foreign_module.items); + } + ItemKind::GlobalAsm(ref asm) => visitor.visit_inline_asm(asm), + ItemKind::TyAlias(box TyAlias { ref generics, ref bounds, ref ty, .. }) => { + visitor.visit_generics(generics); + walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); + walk_list!(visitor, visit_ty, ty); + } + ItemKind::Enum(ref enum_definition, ref generics) => { + visitor.visit_generics(generics); + visitor.visit_enum_def(enum_definition, generics, item.id, item.span) + } + ItemKind::Impl(box Impl { + defaultness: _, + unsafety: _, + ref generics, + constness: _, + polarity: _, + ref of_trait, + ref self_ty, + ref items, + }) => { + visitor.visit_generics(generics); + walk_list!(visitor, visit_trait_ref, of_trait); + visitor.visit_ty(self_ty); + walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Impl); + } + ItemKind::Struct(ref struct_definition, ref generics) + | ItemKind::Union(ref struct_definition, ref generics) => { + visitor.visit_generics(generics); + visitor.visit_variant_data(struct_definition); + } + ItemKind::Trait(box Trait { + unsafety: _, + is_auto: _, + ref generics, + ref bounds, + ref items, + }) => { + visitor.visit_generics(generics); + walk_list!(visitor, visit_param_bound, bounds, BoundKind::SuperTraits); + walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Trait); + } + ItemKind::TraitAlias(ref generics, ref bounds) => { + visitor.visit_generics(generics); + walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); + } + ItemKind::MacCall(ref mac) => visitor.visit_mac_call(mac), + ItemKind::MacroDef(ref ts) => visitor.visit_mac_def(ts, item.id), + } + walk_list!(visitor, visit_attribute, &item.attrs); +} + +pub fn walk_enum_def<'a, V: Visitor<'a>>( + visitor: &mut V, + enum_definition: &'a EnumDef, + _: &'a Generics, + _: NodeId, +) { + walk_list!(visitor, visit_variant, &enum_definition.variants); +} + +pub fn walk_variant<'a, V: Visitor<'a>>(visitor: &mut V, variant: &'a Variant) +where + V: Visitor<'a>, +{ + visitor.visit_ident(variant.ident); + visitor.visit_vis(&variant.vis); + visitor.visit_variant_data(&variant.data); + walk_list!(visitor, visit_anon_const, &variant.disr_expr); + walk_list!(visitor, visit_attribute, &variant.attrs); +} + +pub fn walk_expr_field<'a, V: Visitor<'a>>(visitor: &mut V, f: &'a ExprField) { + visitor.visit_expr(&f.expr); + visitor.visit_ident(f.ident); + walk_list!(visitor, visit_attribute, f.attrs.iter()); +} + +pub fn walk_pat_field<'a, V: Visitor<'a>>(visitor: &mut V, fp: &'a PatField) { + visitor.visit_ident(fp.ident); + visitor.visit_pat(&fp.pat); + walk_list!(visitor, visit_attribute, fp.attrs.iter()); +} + +pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) { + match typ.kind { + TyKind::Slice(ref ty) | TyKind::Paren(ref ty) => visitor.visit_ty(ty), + TyKind::Ptr(ref mutable_type) => visitor.visit_ty(&mutable_type.ty), + TyKind::Rptr(ref opt_lifetime, ref mutable_type) => { + walk_list!(visitor, visit_lifetime, opt_lifetime, LifetimeCtxt::Rptr); + visitor.visit_ty(&mutable_type.ty) + } + TyKind::Tup(ref tuple_element_types) => { + walk_list!(visitor, visit_ty, tuple_element_types); + } + TyKind::BareFn(ref function_declaration) => { + walk_list!(visitor, visit_generic_param, &function_declaration.generic_params); + walk_fn_decl(visitor, &function_declaration.decl); + } + TyKind::Path(ref maybe_qself, ref path) => { + if let Some(ref qself) = *maybe_qself { + visitor.visit_ty(&qself.ty); + } + visitor.visit_path(path, typ.id); + } + TyKind::Array(ref ty, ref length) => { + visitor.visit_ty(ty); + visitor.visit_anon_const(length) + } + TyKind::TraitObject(ref bounds, ..) => { + walk_list!(visitor, visit_param_bound, bounds, BoundKind::TraitObject); + } + TyKind::ImplTrait(_, ref bounds) => { + walk_list!(visitor, visit_param_bound, bounds, BoundKind::Impl); + } + TyKind::Typeof(ref expression) => visitor.visit_anon_const(expression), + TyKind::Infer | TyKind::ImplicitSelf | TyKind::Err => {} + TyKind::MacCall(ref mac) => visitor.visit_mac_call(mac), + TyKind::Never | TyKind::CVarArgs => {} + } +} + +pub fn walk_path<'a, V: Visitor<'a>>(visitor: &mut V, path: &'a Path) { + for segment in &path.segments { + visitor.visit_path_segment(path.span, segment); + } +} + +pub fn walk_use_tree<'a, V: Visitor<'a>>(visitor: &mut V, use_tree: &'a UseTree, id: NodeId) { + visitor.visit_path(&use_tree.prefix, id); + match use_tree.kind { + UseTreeKind::Simple(rename, ..) => { + // The extra IDs are handled during HIR lowering. + if let Some(rename) = rename { + visitor.visit_ident(rename); + } + } + UseTreeKind::Glob => {} + UseTreeKind::Nested(ref use_trees) => { + for &(ref nested_tree, nested_id) in use_trees { + visitor.visit_use_tree(nested_tree, nested_id, true); + } + } + } +} + +pub fn walk_path_segment<'a, V: Visitor<'a>>( + visitor: &mut V, + path_span: Span, + segment: &'a PathSegment, +) { + visitor.visit_ident(segment.ident); + if let Some(ref args) = segment.args { + visitor.visit_generic_args(path_span, args); + } +} + +pub fn walk_generic_args<'a, V>(visitor: &mut V, _path_span: Span, generic_args: &'a GenericArgs) +where + V: Visitor<'a>, +{ + match *generic_args { + GenericArgs::AngleBracketed(ref data) => { + for arg in &data.args { + match arg { + AngleBracketedArg::Arg(a) => visitor.visit_generic_arg(a), + AngleBracketedArg::Constraint(c) => visitor.visit_assoc_constraint(c), + } + } + } + GenericArgs::Parenthesized(ref data) => { + walk_list!(visitor, visit_ty, &data.inputs); + walk_fn_ret_ty(visitor, &data.output); + } + } +} + +pub fn walk_generic_arg<'a, V>(visitor: &mut V, generic_arg: &'a GenericArg) +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_constraint<'a, V: Visitor<'a>>(visitor: &mut V, constraint: &'a AssocConstraint) { + visitor.visit_ident(constraint.ident); + if let Some(ref gen_args) = constraint.gen_args { + visitor.visit_generic_args(gen_args.span(), gen_args); + } + match constraint.kind { + AssocConstraintKind::Equality { ref term } => match term { + Term::Ty(ty) => visitor.visit_ty(ty), + Term::Const(c) => visitor.visit_anon_const(c), + }, + AssocConstraintKind::Bound { ref bounds } => { + walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); + } + } +} + +pub fn walk_pat<'a, V: Visitor<'a>>(visitor: &mut V, pattern: &'a Pat) { + match pattern.kind { + PatKind::TupleStruct(ref opt_qself, ref path, ref elems) => { + if let Some(ref qself) = *opt_qself { + visitor.visit_ty(&qself.ty); + } + visitor.visit_path(path, pattern.id); + walk_list!(visitor, visit_pat, elems); + } + PatKind::Path(ref opt_qself, ref path) => { + if let Some(ref qself) = *opt_qself { + visitor.visit_ty(&qself.ty); + } + visitor.visit_path(path, pattern.id) + } + PatKind::Struct(ref opt_qself, ref path, ref fields, _) => { + if let Some(ref qself) = *opt_qself { + visitor.visit_ty(&qself.ty); + } + visitor.visit_path(path, pattern.id); + walk_list!(visitor, visit_pat_field, fields); + } + PatKind::Box(ref subpattern) + | PatKind::Ref(ref subpattern, _) + | PatKind::Paren(ref subpattern) => visitor.visit_pat(subpattern), + PatKind::Ident(_, ident, ref optional_subpattern) => { + visitor.visit_ident(ident); + walk_list!(visitor, visit_pat, optional_subpattern); + } + PatKind::Lit(ref expression) => visitor.visit_expr(expression), + PatKind::Range(ref lower_bound, ref upper_bound, _) => { + walk_list!(visitor, visit_expr, lower_bound); + walk_list!(visitor, visit_expr, upper_bound); + } + PatKind::Wild | PatKind::Rest => {} + PatKind::Tuple(ref elems) | PatKind::Slice(ref elems) | PatKind::Or(ref elems) => { + walk_list!(visitor, visit_pat, elems); + } + PatKind::MacCall(ref mac) => visitor.visit_mac_call(mac), + } +} + +pub fn walk_foreign_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a ForeignItem) { + let Item { id, span, ident, ref vis, ref attrs, ref kind, tokens: _ } = *item; + visitor.visit_vis(vis); + visitor.visit_ident(ident); + walk_list!(visitor, visit_attribute, attrs); + match kind { + ForeignItemKind::Static(ty, _, expr) => { + visitor.visit_ty(ty); + walk_list!(visitor, visit_expr, expr); + } + ForeignItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { + let kind = FnKind::Fn(FnCtxt::Foreign, ident, sig, vis, generics, body.as_deref()); + visitor.visit_fn(kind, span, id); + } + ForeignItemKind::TyAlias(box TyAlias { generics, bounds, ty, .. }) => { + visitor.visit_generics(generics); + walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); + walk_list!(visitor, visit_ty, ty); + } + ForeignItemKind::MacCall(mac) => { + visitor.visit_mac_call(mac); + } + } +} + +pub fn walk_param_bound<'a, V: Visitor<'a>>(visitor: &mut V, bound: &'a GenericBound) { + match *bound { + GenericBound::Trait(ref typ, ref modifier) => visitor.visit_poly_trait_ref(typ, modifier), + GenericBound::Outlives(ref lifetime) => { + visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound) + } + } +} + +pub fn walk_generic_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a GenericParam) { + visitor.visit_ident(param.ident); + walk_list!(visitor, visit_attribute, param.attrs.iter()); + walk_list!(visitor, visit_param_bound, ¶m.bounds, BoundKind::Bound); + match param.kind { + GenericParamKind::Lifetime => (), + GenericParamKind::Type { ref default } => walk_list!(visitor, visit_ty, default), + GenericParamKind::Const { ref ty, ref default, .. } => { + visitor.visit_ty(ty); + if let Some(default) = default { + visitor.visit_anon_const(default); + } + } + } +} + +pub fn walk_generics<'a, V: Visitor<'a>>(visitor: &mut V, generics: &'a Generics) { + walk_list!(visitor, visit_generic_param, &generics.params); + walk_list!(visitor, visit_where_predicate, &generics.where_clause.predicates); +} + +pub fn walk_closure_binder<'a, V: Visitor<'a>>(visitor: &mut V, binder: &'a ClosureBinder) { + match binder { + ClosureBinder::NotPresent => {} + ClosureBinder::For { generic_params, span: _ } => { + walk_list!(visitor, visit_generic_param, generic_params) + } + } +} + +pub fn walk_where_predicate<'a, V: Visitor<'a>>(visitor: &mut V, predicate: &'a WherePredicate) { + match *predicate { + WherePredicate::BoundPredicate(WhereBoundPredicate { + ref bounded_ty, + ref bounds, + ref bound_generic_params, + .. + }) => { + visitor.visit_ty(bounded_ty); + walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); + walk_list!(visitor, visit_generic_param, bound_generic_params); + } + WherePredicate::RegionPredicate(WhereRegionPredicate { + ref lifetime, ref bounds, .. + }) => { + visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound); + walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); + } + WherePredicate::EqPredicate(WhereEqPredicate { ref lhs_ty, ref rhs_ty, .. }) => { + visitor.visit_ty(lhs_ty); + visitor.visit_ty(rhs_ty); + } + } +} + +pub fn walk_fn_ret_ty<'a, V: Visitor<'a>>(visitor: &mut V, ret_ty: &'a FnRetTy) { + if let FnRetTy::Ty(ref output_ty) = *ret_ty { + visitor.visit_ty(output_ty) + } +} + +pub fn walk_fn_decl<'a, V: Visitor<'a>>(visitor: &mut V, function_declaration: &'a FnDecl) { + for param in &function_declaration.inputs { + visitor.visit_param(param); + } + visitor.visit_fn_ret_ty(&function_declaration.output); +} + +pub fn walk_fn<'a, V: Visitor<'a>>(visitor: &mut V, kind: FnKind<'a>, _span: Span) { + match kind { + FnKind::Fn(_, _, sig, _, generics, body) => { + visitor.visit_generics(generics); + visitor.visit_fn_header(&sig.header); + walk_fn_decl(visitor, &sig.decl); + walk_list!(visitor, visit_block, body); + } + FnKind::Closure(binder, decl, body) => { + visitor.visit_closure_binder(binder); + walk_fn_decl(visitor, decl); + visitor.visit_expr(body); + } + } +} + +pub fn walk_assoc_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a AssocItem, ctxt: AssocCtxt) { + let Item { id, span, ident, ref vis, ref attrs, ref kind, tokens: _ } = *item; + visitor.visit_vis(vis); + visitor.visit_ident(ident); + walk_list!(visitor, visit_attribute, attrs); + match kind { + AssocItemKind::Const(_, ty, expr) => { + visitor.visit_ty(ty); + walk_list!(visitor, visit_expr, expr); + } + AssocItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { + let kind = FnKind::Fn(FnCtxt::Assoc(ctxt), ident, sig, vis, generics, body.as_deref()); + visitor.visit_fn(kind, span, id); + } + AssocItemKind::TyAlias(box TyAlias { generics, bounds, ty, .. }) => { + visitor.visit_generics(generics); + walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); + walk_list!(visitor, visit_ty, ty); + } + AssocItemKind::MacCall(mac) => { + visitor.visit_mac_call(mac); + } + } +} + +pub fn walk_struct_def<'a, V: Visitor<'a>>(visitor: &mut V, struct_definition: &'a VariantData) { + walk_list!(visitor, visit_field_def, struct_definition.fields()); +} + +pub fn walk_field_def<'a, V: Visitor<'a>>(visitor: &mut V, field: &'a FieldDef) { + visitor.visit_vis(&field.vis); + if let Some(ident) = field.ident { + visitor.visit_ident(ident); + } + visitor.visit_ty(&field.ty); + walk_list!(visitor, visit_attribute, &field.attrs); +} + +pub fn walk_block<'a, V: Visitor<'a>>(visitor: &mut V, block: &'a Block) { + walk_list!(visitor, visit_stmt, &block.stmts); +} + +pub fn walk_stmt<'a, V: Visitor<'a>>(visitor: &mut V, statement: &'a Stmt) { + match statement.kind { + StmtKind::Local(ref local) => visitor.visit_local(local), + StmtKind::Item(ref item) => visitor.visit_item(item), + StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => visitor.visit_expr(expr), + StmtKind::Empty => {} + StmtKind::MacCall(ref mac) => { + let MacCallStmt { ref mac, style: _, ref attrs, tokens: _ } = **mac; + visitor.visit_mac_call(mac); + for attr in attrs.iter() { + visitor.visit_attribute(attr); + } + } + } +} + +pub fn walk_mac<'a, V: Visitor<'a>>(visitor: &mut V, mac: &'a MacCall) { + visitor.visit_path(&mac.path, DUMMY_NODE_ID); +} + +pub fn walk_anon_const<'a, V: Visitor<'a>>(visitor: &mut V, constant: &'a AnonConst) { + visitor.visit_expr(&constant.value); +} + +pub fn walk_inline_asm<'a, V: Visitor<'a>>(visitor: &mut V, asm: &'a InlineAsm) { + for (op, _) in &asm.operands { + match op { + InlineAsmOperand::In { expr, .. } + | InlineAsmOperand::Out { expr: Some(expr), .. } + | InlineAsmOperand::InOut { expr, .. } => visitor.visit_expr(expr), + InlineAsmOperand::Out { expr: None, .. } => {} + InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => { + visitor.visit_expr(in_expr); + if let Some(out_expr) = out_expr { + visitor.visit_expr(out_expr); + } + } + InlineAsmOperand::Const { anon_const, .. } => visitor.visit_anon_const(anon_const), + InlineAsmOperand::Sym { sym } => visitor.visit_inline_asm_sym(sym), + } + } +} + +pub fn walk_inline_asm_sym<'a, V: Visitor<'a>>(visitor: &mut V, sym: &'a InlineAsmSym) { + if let Some(ref qself) = sym.qself { + visitor.visit_ty(&qself.ty); + } + visitor.visit_path(&sym.path, sym.id); +} + +pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) { + walk_list!(visitor, visit_attribute, expression.attrs.iter()); + + match expression.kind { + ExprKind::Box(ref subexpression) => visitor.visit_expr(subexpression), + ExprKind::Array(ref subexpressions) => { + walk_list!(visitor, visit_expr, subexpressions); + } + ExprKind::ConstBlock(ref anon_const) => visitor.visit_anon_const(anon_const), + ExprKind::Repeat(ref element, ref count) => { + visitor.visit_expr(element); + visitor.visit_anon_const(count) + } + ExprKind::Struct(ref se) => { + if let Some(ref qself) = se.qself { + visitor.visit_ty(&qself.ty); + } + visitor.visit_path(&se.path, expression.id); + walk_list!(visitor, visit_expr_field, &se.fields); + match &se.rest { + StructRest::Base(expr) => visitor.visit_expr(expr), + StructRest::Rest(_span) => {} + StructRest::None => {} + } + } + ExprKind::Tup(ref subexpressions) => { + walk_list!(visitor, visit_expr, subexpressions); + } + ExprKind::Call(ref callee_expression, ref arguments) => { + visitor.visit_expr(callee_expression); + walk_list!(visitor, visit_expr, arguments); + } + ExprKind::MethodCall(ref segment, ref arguments, _span) => { + visitor.visit_path_segment(expression.span, segment); + walk_list!(visitor, visit_expr, arguments); + } + ExprKind::Binary(_, ref left_expression, ref right_expression) => { + visitor.visit_expr(left_expression); + visitor.visit_expr(right_expression) + } + ExprKind::AddrOf(_, _, ref subexpression) | ExprKind::Unary(_, ref subexpression) => { + visitor.visit_expr(subexpression) + } + ExprKind::Cast(ref subexpression, ref typ) | ExprKind::Type(ref subexpression, ref typ) => { + visitor.visit_expr(subexpression); + visitor.visit_ty(typ) + } + ExprKind::Let(ref pat, ref expr, _) => { + visitor.visit_pat(pat); + visitor.visit_expr(expr); + } + ExprKind::If(ref head_expression, ref if_block, ref optional_else) => { + visitor.visit_expr(head_expression); + visitor.visit_block(if_block); + walk_list!(visitor, visit_expr, optional_else); + } + ExprKind::While(ref subexpression, ref block, ref opt_label) => { + walk_list!(visitor, visit_label, opt_label); + visitor.visit_expr(subexpression); + visitor.visit_block(block); + } + ExprKind::ForLoop(ref pattern, ref subexpression, ref block, ref opt_label) => { + walk_list!(visitor, visit_label, opt_label); + visitor.visit_pat(pattern); + visitor.visit_expr(subexpression); + visitor.visit_block(block); + } + ExprKind::Loop(ref block, ref opt_label) => { + walk_list!(visitor, visit_label, opt_label); + visitor.visit_block(block); + } + ExprKind::Match(ref subexpression, ref arms) => { + visitor.visit_expr(subexpression); + walk_list!(visitor, visit_arm, arms); + } + ExprKind::Closure(ref binder, _, _, _, ref decl, ref body, _decl_span) => { + visitor.visit_fn(FnKind::Closure(binder, decl, body), expression.span, expression.id) + } + ExprKind::Block(ref block, ref opt_label) => { + walk_list!(visitor, visit_label, opt_label); + visitor.visit_block(block); + } + ExprKind::Async(_, _, ref body) => { + visitor.visit_block(body); + } + ExprKind::Await(ref expr) => visitor.visit_expr(expr), + ExprKind::Assign(ref lhs, ref rhs, _) => { + visitor.visit_expr(lhs); + visitor.visit_expr(rhs); + } + ExprKind::AssignOp(_, ref left_expression, ref right_expression) => { + visitor.visit_expr(left_expression); + visitor.visit_expr(right_expression); + } + ExprKind::Field(ref subexpression, ident) => { + visitor.visit_expr(subexpression); + visitor.visit_ident(ident); + } + ExprKind::Index(ref main_expression, ref index_expression) => { + visitor.visit_expr(main_expression); + visitor.visit_expr(index_expression) + } + ExprKind::Range(ref start, ref end, _) => { + walk_list!(visitor, visit_expr, start); + walk_list!(visitor, visit_expr, end); + } + ExprKind::Underscore => {} + ExprKind::Path(ref maybe_qself, ref path) => { + if let Some(ref qself) = *maybe_qself { + visitor.visit_ty(&qself.ty); + } + visitor.visit_path(path, expression.id) + } + ExprKind::Break(ref opt_label, ref opt_expr) => { + walk_list!(visitor, visit_label, opt_label); + walk_list!(visitor, visit_expr, opt_expr); + } + ExprKind::Continue(ref opt_label) => { + walk_list!(visitor, visit_label, opt_label); + } + ExprKind::Ret(ref optional_expression) => { + walk_list!(visitor, visit_expr, optional_expression); + } + ExprKind::Yeet(ref optional_expression) => { + walk_list!(visitor, visit_expr, optional_expression); + } + ExprKind::MacCall(ref mac) => visitor.visit_mac_call(mac), + ExprKind::Paren(ref subexpression) => visitor.visit_expr(subexpression), + ExprKind::InlineAsm(ref asm) => visitor.visit_inline_asm(asm), + ExprKind::Yield(ref optional_expression) => { + walk_list!(visitor, visit_expr, optional_expression); + } + ExprKind::Try(ref subexpression) => visitor.visit_expr(subexpression), + ExprKind::TryBlock(ref body) => visitor.visit_block(body), + ExprKind::Lit(_) | ExprKind::Err => {} + } + + visitor.visit_expr_post(expression) +} + +pub fn walk_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a Param) { + walk_list!(visitor, visit_attribute, param.attrs.iter()); + visitor.visit_pat(¶m.pat); + visitor.visit_ty(¶m.ty); +} + +pub fn walk_arm<'a, V: Visitor<'a>>(visitor: &mut V, arm: &'a Arm) { + visitor.visit_pat(&arm.pat); + walk_list!(visitor, visit_expr, &arm.guard); + visitor.visit_expr(&arm.body); + walk_list!(visitor, visit_attribute, &arm.attrs); +} + +pub fn walk_vis<'a, V: Visitor<'a>>(visitor: &mut V, vis: &'a Visibility) { + if let VisibilityKind::Restricted { ref path, id } = vis.kind { + visitor.visit_path(path, id); + } +} + +pub fn walk_attribute<'a, V: Visitor<'a>>(visitor: &mut V, attr: &'a Attribute) { + match attr.kind { + AttrKind::Normal(ref item, ref _tokens) => walk_mac_args(visitor, &item.args), + AttrKind::DocComment(..) => {} + } +} + +pub fn walk_mac_args<'a, V: Visitor<'a>>(visitor: &mut V, args: &'a MacArgs) { + match args { + MacArgs::Empty => {} + MacArgs::Delimited(_dspan, _delim, _tokens) => {} + MacArgs::Eq(_eq_span, MacArgsEq::Ast(expr)) => visitor.visit_expr(expr), + MacArgs::Eq(_, MacArgsEq::Hir(lit)) => { + unreachable!("in literal form when walking mac args eq: {:?}", lit) + } + } +} -- cgit v1.2.3