]>
Commit | Line | Data |
---|---|---|
1a4d82fc JJ |
1 | //! AST walker. Each overridden visit method has full control over what |
2 | //! happens with its node, it can do its own traversal of the node's children, | |
3 | //! call `visit::walk_*` to apply the default traversal algorithm, or prevent | |
4 | //! deeper traversal by doing nothing. | |
5 | //! | |
6 | //! Note: it is an important invariant that the default visitor walks the body | |
7 | //! of a function in "execution order" (more concretely, reverse post-order | |
8 | //! with respect to the CFG implied by the AST), meaning that if AST node A may | |
9fa01778 | 9 | //! execute before AST node B, then A is visited first. The borrow checker in |
1a4d82fc JJ |
10 | //! particular relies on this property. |
11 | //! | |
12 | //! Note: walking an AST before macro expansion is probably a bad idea. For | |
13 | //! instance, a walker looking for item names in a module will miss all of | |
14 | //! those that are created by the expansion of a macro. | |
15 | ||
9fa01778 | 16 | use crate::ast::*; |
9fa01778 | 17 | |
064997fb | 18 | use rustc_span::symbol::Ident; |
dfeec247 | 19 | use rustc_span::Span; |
1a4d82fc | 20 | |
94222f64 | 21 | #[derive(Copy, Clone, Debug, PartialEq)] |
74b04a01 XL |
22 | pub enum AssocCtxt { |
23 | Trait, | |
24 | Impl, | |
25 | } | |
26 | ||
94222f64 | 27 | #[derive(Copy, Clone, Debug, PartialEq)] |
74b04a01 XL |
28 | pub enum FnCtxt { |
29 | Free, | |
30 | Foreign, | |
31 | Assoc(AssocCtxt), | |
32 | } | |
33 | ||
04454e1e FG |
34 | #[derive(Copy, Clone, Debug)] |
35 | pub enum BoundKind { | |
36 | /// Trait bounds in generics bounds and type/trait alias. | |
37 | /// E.g., `<T: Bound>`, `type A: Bound`, or `where T: Bound`. | |
38 | Bound, | |
39 | ||
40 | /// Trait bounds in `impl` type. | |
41 | /// E.g., `type Foo = impl Bound1 + Bound2 + Bound3`. | |
42 | Impl, | |
43 | ||
44 | /// Trait bounds in trait object type. | |
45 | /// E.g., `dyn Bound1 + Bound2 + Bound3`. | |
46 | TraitObject, | |
47 | ||
48 | /// Super traits of a trait. | |
49 | /// E.g., `trait A: B` | |
50 | SuperTraits, | |
51 | } | |
52 | ||
94222f64 | 53 | #[derive(Copy, Clone, Debug)] |
1a4d82fc | 54 | pub enum FnKind<'a> { |
74b04a01 | 55 | /// E.g., `fn foo()`, `fn foo(&self)`, or `extern "Abi" fn foo()`. |
04454e1e | 56 | Fn(FnCtxt, Ident, &'a FnSig, &'a Visibility, &'a Generics, Option<&'a Block>), |
1a4d82fc | 57 | |
e1599b0c | 58 | /// E.g., `|x, y| body`. |
064997fb | 59 | Closure(&'a ClosureBinder, &'a FnDecl, &'a Expr), |
1a4d82fc JJ |
60 | } |
61 | ||
48663c56 XL |
62 | impl<'a> FnKind<'a> { |
63 | pub fn header(&self) -> Option<&'a FnHeader> { | |
64 | match *self { | |
04454e1e | 65 | FnKind::Fn(_, _, sig, _, _, _) => Some(&sig.header), |
064997fb | 66 | FnKind::Closure(_, _, _) => None, |
74b04a01 XL |
67 | } |
68 | } | |
69 | ||
3dfed10e XL |
70 | pub fn ident(&self) -> Option<&Ident> { |
71 | match self { | |
72 | FnKind::Fn(_, ident, ..) => Some(ident), | |
73 | _ => None, | |
74 | } | |
75 | } | |
76 | ||
74b04a01 XL |
77 | pub fn decl(&self) -> &'a FnDecl { |
78 | match self { | |
04454e1e | 79 | FnKind::Fn(_, _, sig, _, _, _) => &sig.decl, |
064997fb | 80 | FnKind::Closure(_, decl, _) => decl, |
74b04a01 XL |
81 | } |
82 | } | |
83 | ||
84 | pub fn ctxt(&self) -> Option<FnCtxt> { | |
85 | match self { | |
86 | FnKind::Fn(ctxt, ..) => Some(*ctxt), | |
87 | FnKind::Closure(..) => None, | |
48663c56 XL |
88 | } |
89 | } | |
90 | } | |
91 | ||
923072b8 FG |
92 | #[derive(Copy, Clone, Debug)] |
93 | pub enum LifetimeCtxt { | |
94 | /// Appears in a reference type. | |
95 | Rptr, | |
96 | /// Appears as a bound on a type or another lifetime. | |
97 | Bound, | |
98 | /// Appears as a generic argument. | |
99 | GenericArg, | |
100 | } | |
101 | ||
e1599b0c | 102 | /// Each method of the `Visitor` trait is a hook to be potentially |
9fa01778 | 103 | /// overridden. Each method's default implementation recursively visits |
1a4d82fc | 104 | /// the substructure of the input via the corresponding `walk` method; |
6a06907d | 105 | /// e.g., the `visit_item` method by default calls `visit::walk_item`. |
1a4d82fc JJ |
106 | /// |
107 | /// If you want to ensure that your code handles every variant | |
9fa01778 | 108 | /// explicitly, you need to override each method. (And you also need |
1a4d82fc JJ |
109 | /// to monitor future changes to `Visitor` in case a new method with a |
110 | /// new default implementation gets introduced.) | |
476ff2be | 111 | pub trait Visitor<'ast>: Sized { |
064997fb | 112 | fn visit_ident(&mut self, _ident: Ident) {} |
dfeec247 XL |
113 | fn visit_foreign_item(&mut self, i: &'ast ForeignItem) { |
114 | walk_foreign_item(self, i) | |
115 | } | |
dfeec247 XL |
116 | fn visit_item(&mut self, i: &'ast Item) { |
117 | walk_item(self, i) | |
118 | } | |
119 | fn visit_local(&mut self, l: &'ast Local) { | |
120 | walk_local(self, l) | |
121 | } | |
122 | fn visit_block(&mut self, b: &'ast Block) { | |
123 | walk_block(self, b) | |
124 | } | |
125 | fn visit_stmt(&mut self, s: &'ast Stmt) { | |
126 | walk_stmt(self, s) | |
127 | } | |
128 | fn visit_param(&mut self, param: &'ast Param) { | |
129 | walk_param(self, param) | |
130 | } | |
131 | fn visit_arm(&mut self, a: &'ast Arm) { | |
132 | walk_arm(self, a) | |
133 | } | |
134 | fn visit_pat(&mut self, p: &'ast Pat) { | |
135 | walk_pat(self, p) | |
136 | } | |
137 | fn visit_anon_const(&mut self, c: &'ast AnonConst) { | |
138 | walk_anon_const(self, c) | |
139 | } | |
140 | fn visit_expr(&mut self, ex: &'ast Expr) { | |
141 | walk_expr(self, ex) | |
142 | } | |
143 | fn visit_expr_post(&mut self, _ex: &'ast Expr) {} | |
144 | fn visit_ty(&mut self, t: &'ast Ty) { | |
145 | walk_ty(self, t) | |
146 | } | |
8faf50e0 XL |
147 | fn visit_generic_param(&mut self, param: &'ast GenericParam) { |
148 | walk_generic_param(self, param) | |
149 | } | |
dfeec247 XL |
150 | fn visit_generics(&mut self, g: &'ast Generics) { |
151 | walk_generics(self, g) | |
152 | } | |
064997fb FG |
153 | fn visit_closure_binder(&mut self, b: &'ast ClosureBinder) { |
154 | walk_closure_binder(self, b) | |
155 | } | |
8bb4bdeb XL |
156 | fn visit_where_predicate(&mut self, p: &'ast WherePredicate) { |
157 | walk_where_predicate(self, p) | |
158 | } | |
74b04a01 XL |
159 | fn visit_fn(&mut self, fk: FnKind<'ast>, s: Span, _: NodeId) { |
160 | walk_fn(self, fk, s) | |
476ff2be | 161 | } |
74b04a01 XL |
162 | fn visit_assoc_item(&mut self, i: &'ast AssocItem, ctxt: AssocCtxt) { |
163 | walk_assoc_item(self, i, ctxt) | |
dfeec247 XL |
164 | } |
165 | fn visit_trait_ref(&mut self, t: &'ast TraitRef) { | |
166 | walk_trait_ref(self, t) | |
167 | } | |
04454e1e | 168 | fn visit_param_bound(&mut self, bounds: &'ast GenericBound, _ctxt: BoundKind) { |
8faf50e0 | 169 | walk_param_bound(self, bounds) |
1a4d82fc | 170 | } |
476ff2be | 171 | fn visit_poly_trait_ref(&mut self, t: &'ast PolyTraitRef, m: &'ast TraitBoundModifier) { |
1a4d82fc JJ |
172 | walk_poly_trait_ref(self, t, m) |
173 | } | |
e1599b0c | 174 | fn visit_variant_data(&mut self, s: &'ast VariantData) { |
1a4d82fc JJ |
175 | walk_struct_def(self, s) |
176 | } | |
6a06907d XL |
177 | fn visit_field_def(&mut self, s: &'ast FieldDef) { |
178 | walk_field_def(self, s) | |
dfeec247 XL |
179 | } |
180 | fn visit_enum_def( | |
181 | &mut self, | |
182 | enum_definition: &'ast EnumDef, | |
183 | generics: &'ast Generics, | |
184 | item_id: NodeId, | |
185 | _: Span, | |
186 | ) { | |
b039eaaf | 187 | walk_enum_def(self, enum_definition, generics, item_id) |
c1a9b12d | 188 | } |
e1599b0c XL |
189 | fn visit_variant(&mut self, v: &'ast Variant) { |
190 | walk_variant(self, v) | |
1a4d82fc | 191 | } |
2c00a5a8 XL |
192 | fn visit_label(&mut self, label: &'ast Label) { |
193 | walk_label(self, label) | |
194 | } | |
923072b8 | 195 | fn visit_lifetime(&mut self, lifetime: &'ast Lifetime, _: LifetimeCtxt) { |
b039eaaf | 196 | walk_lifetime(self, lifetime) |
1a4d82fc | 197 | } |
29967ef6 XL |
198 | fn visit_mac_call(&mut self, mac: &'ast MacCall) { |
199 | walk_mac(self, mac) | |
1a4d82fc | 200 | } |
7cac9316 XL |
201 | fn visit_mac_def(&mut self, _mac: &'ast MacroDef, _id: NodeId) { |
202 | // Nothing to do | |
203 | } | |
476ff2be | 204 | fn visit_path(&mut self, path: &'ast Path, _id: NodeId) { |
1a4d82fc JJ |
205 | walk_path(self, path) |
206 | } | |
ff7c6d11 XL |
207 | fn visit_use_tree(&mut self, use_tree: &'ast UseTree, id: NodeId, _nested: bool) { |
208 | walk_use_tree(self, use_tree, id) | |
b039eaaf | 209 | } |
476ff2be | 210 | fn visit_path_segment(&mut self, path_span: Span, path_segment: &'ast PathSegment) { |
1a4d82fc JJ |
211 | walk_path_segment(self, path_span, path_segment) |
212 | } | |
8faf50e0 XL |
213 | fn visit_generic_args(&mut self, path_span: Span, generic_args: &'ast GenericArgs) { |
214 | walk_generic_args(self, path_span, generic_args) | |
215 | } | |
216 | fn visit_generic_arg(&mut self, generic_arg: &'ast GenericArg) { | |
29967ef6 | 217 | walk_generic_arg(self, generic_arg) |
1a4d82fc | 218 | } |
5099ac24 FG |
219 | fn visit_assoc_constraint(&mut self, constraint: &'ast AssocConstraint) { |
220 | walk_assoc_constraint(self, constraint) | |
1a4d82fc | 221 | } |
abe05a73 XL |
222 | fn visit_attribute(&mut self, attr: &'ast Attribute) { |
223 | walk_attribute(self, attr) | |
224 | } | |
476ff2be | 225 | fn visit_vis(&mut self, vis: &'ast Visibility) { |
54a0048b SL |
226 | walk_vis(self, vis) |
227 | } | |
74b04a01 | 228 | fn visit_fn_ret_ty(&mut self, ret_ty: &'ast FnRetTy) { |
5bcae85e SL |
229 | walk_fn_ret_ty(self, ret_ty) |
230 | } | |
532ac7d7 XL |
231 | fn visit_fn_header(&mut self, _header: &'ast FnHeader) { |
232 | // Nothing to do | |
233 | } | |
6a06907d XL |
234 | fn visit_expr_field(&mut self, f: &'ast ExprField) { |
235 | walk_expr_field(self, f) | |
e1599b0c | 236 | } |
6a06907d XL |
237 | fn visit_pat_field(&mut self, fp: &'ast PatField) { |
238 | walk_pat_field(self, fp) | |
e1599b0c | 239 | } |
a2a8927a XL |
240 | fn visit_crate(&mut self, krate: &'ast Crate) { |
241 | walk_crate(self, krate) | |
242 | } | |
04454e1e FG |
243 | fn visit_inline_asm(&mut self, asm: &'ast InlineAsm) { |
244 | walk_inline_asm(self, asm) | |
245 | } | |
246 | fn visit_inline_asm_sym(&mut self, sym: &'ast InlineAsmSym) { | |
247 | walk_inline_asm_sym(self, sym) | |
248 | } | |
223e47cc LB |
249 | } |
250 | ||
b039eaaf SL |
251 | #[macro_export] |
252 | macro_rules! walk_list { | |
253 | ($visitor: expr, $method: ident, $list: expr) => { | |
254 | for elem in $list { | |
255 | $visitor.$method(elem) | |
256 | } | |
257 | }; | |
258 | ($visitor: expr, $method: ident, $list: expr, $($extra_args: expr),*) => { | |
259 | for elem in $list { | |
260 | $visitor.$method(elem, $($extra_args,)*) | |
261 | } | |
1a4d82fc JJ |
262 | } |
263 | } | |
264 | ||
476ff2be | 265 | pub fn walk_crate<'a, V: Visitor<'a>>(visitor: &mut V, krate: &'a Crate) { |
6a06907d | 266 | walk_list!(visitor, visit_item, &krate.items); |
b039eaaf | 267 | walk_list!(visitor, visit_attribute, &krate.attrs); |
1a4d82fc JJ |
268 | } |
269 | ||
476ff2be | 270 | pub fn walk_local<'a, V: Visitor<'a>>(visitor: &mut V, local: &'a Local) { |
3157f602 XL |
271 | for attr in local.attrs.iter() { |
272 | visitor.visit_attribute(attr); | |
273 | } | |
b039eaaf SL |
274 | visitor.visit_pat(&local.pat); |
275 | walk_list!(visitor, visit_ty, &local.ty); | |
94222f64 XL |
276 | if let Some((init, els)) = local.kind.init_else_opt() { |
277 | visitor.visit_expr(init); | |
278 | walk_list!(visitor, visit_block, els); | |
279 | } | |
b039eaaf SL |
280 | } |
281 | ||
2c00a5a8 | 282 | pub fn walk_label<'a, V: Visitor<'a>>(visitor: &mut V, label: &'a Label) { |
83c7162d | 283 | visitor.visit_ident(label.ident); |
2c00a5a8 XL |
284 | } |
285 | ||
476ff2be | 286 | pub fn walk_lifetime<'a, V: Visitor<'a>>(visitor: &mut V, lifetime: &'a Lifetime) { |
83c7162d | 287 | visitor.visit_ident(lifetime.ident); |
b039eaaf SL |
288 | } |
289 | ||
dfeec247 XL |
290 | pub fn walk_poly_trait_ref<'a, V>( |
291 | visitor: &mut V, | |
292 | trait_ref: &'a PolyTraitRef, | |
293 | _: &TraitBoundModifier, | |
294 | ) where | |
295 | V: Visitor<'a>, | |
1a4d82fc | 296 | { |
ff7c6d11 | 297 | walk_list!(visitor, visit_generic_param, &trait_ref.bound_generic_params); |
1a4d82fc JJ |
298 | visitor.visit_trait_ref(&trait_ref.trait_ref); |
299 | } | |
300 | ||
476ff2be | 301 | pub fn walk_trait_ref<'a, V: Visitor<'a>>(visitor: &mut V, trait_ref: &'a TraitRef) { |
1a4d82fc JJ |
302 | visitor.visit_path(&trait_ref.path, trait_ref.ref_id) |
303 | } | |
304 | ||
476ff2be | 305 | pub fn walk_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a Item) { |
a7813a04 | 306 | visitor.visit_vis(&item.vis); |
83c7162d | 307 | visitor.visit_ident(item.ident); |
e74abb32 | 308 | match item.kind { |
064997fb | 309 | ItemKind::ExternCrate(_) => {} |
dfeec247 | 310 | ItemKind::Use(ref use_tree) => visitor.visit_use_tree(use_tree, item.id, false), |
74b04a01 | 311 | ItemKind::Static(ref typ, _, ref expr) | ItemKind::Const(_, ref typ, ref expr) => { |
b039eaaf | 312 | visitor.visit_ty(typ); |
74b04a01 | 313 | walk_list!(visitor, visit_expr, expr); |
1a4d82fc | 314 | } |
3c0e092e | 315 | ItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { |
04454e1e FG |
316 | let kind = |
317 | FnKind::Fn(FnCtxt::Free, item.ident, sig, &item.vis, generics, body.as_deref()); | |
74b04a01 | 318 | visitor.visit_fn(kind, item.span, item.id) |
dfeec247 | 319 | } |
6a06907d XL |
320 | ItemKind::Mod(_unsafety, ref mod_kind) => match mod_kind { |
321 | ModKind::Loaded(items, _inline, _inner_span) => { | |
322 | walk_list!(visitor, visit_item, items) | |
323 | } | |
324 | ModKind::Unloaded => {} | |
325 | }, | |
7453a54e | 326 | ItemKind::ForeignMod(ref foreign_module) => { |
b039eaaf | 327 | walk_list!(visitor, visit_foreign_item, &foreign_module.items); |
223e47cc | 328 | } |
923072b8 | 329 | ItemKind::GlobalAsm(ref asm) => visitor.visit_inline_asm(asm), |
5e7ed085 | 330 | ItemKind::TyAlias(box TyAlias { ref generics, ref bounds, ref ty, .. }) => { |
74b04a01 | 331 | visitor.visit_generics(generics); |
04454e1e | 332 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
74b04a01 | 333 | walk_list!(visitor, visit_ty, ty); |
1a4d82fc | 334 | } |
532ac7d7 XL |
335 | ItemKind::Enum(ref enum_definition, ref generics) => { |
336 | visitor.visit_generics(generics); | |
337 | visitor.visit_enum_def(enum_definition, generics, item.id, item.span) | |
1a4d82fc | 338 | } |
3c0e092e | 339 | ItemKind::Impl(box Impl { |
dfeec247 | 340 | defaultness: _, |
3c0e092e | 341 | unsafety: _, |
dfeec247 | 342 | ref generics, |
3c0e092e XL |
343 | constness: _, |
344 | polarity: _, | |
dfeec247 XL |
345 | ref of_trait, |
346 | ref self_ty, | |
347 | ref items, | |
5869c6ff | 348 | }) => { |
532ac7d7 | 349 | visitor.visit_generics(generics); |
dfeec247 XL |
350 | walk_list!(visitor, visit_trait_ref, of_trait); |
351 | visitor.visit_ty(self_ty); | |
74b04a01 | 352 | walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Impl); |
970d7e83 | 353 | } |
dfeec247 XL |
354 | ItemKind::Struct(ref struct_definition, ref generics) |
355 | | ItemKind::Union(ref struct_definition, ref generics) => { | |
1a4d82fc | 356 | visitor.visit_generics(generics); |
e1599b0c | 357 | visitor.visit_variant_data(struct_definition); |
1a4d82fc | 358 | } |
3c0e092e XL |
359 | ItemKind::Trait(box Trait { |
360 | unsafety: _, | |
361 | is_auto: _, | |
362 | ref generics, | |
363 | ref bounds, | |
364 | ref items, | |
365 | }) => { | |
1a4d82fc | 366 | visitor.visit_generics(generics); |
04454e1e | 367 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::SuperTraits); |
74b04a01 | 368 | walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Trait); |
1a4d82fc | 369 | } |
ff7c6d11 XL |
370 | ItemKind::TraitAlias(ref generics, ref bounds) => { |
371 | visitor.visit_generics(generics); | |
04454e1e | 372 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
ff7c6d11 | 373 | } |
29967ef6 | 374 | ItemKind::MacCall(ref mac) => visitor.visit_mac_call(mac), |
7cac9316 | 375 | ItemKind::MacroDef(ref ts) => visitor.visit_mac_def(ts, item.id), |
1a4d82fc | 376 | } |
b039eaaf | 377 | walk_list!(visitor, visit_attribute, &item.attrs); |
223e47cc LB |
378 | } |
379 | ||
e1599b0c XL |
380 | pub fn walk_enum_def<'a, V: Visitor<'a>>( |
381 | visitor: &mut V, | |
382 | enum_definition: &'a EnumDef, | |
383 | _: &'a Generics, | |
384 | _: NodeId, | |
385 | ) { | |
386 | walk_list!(visitor, visit_variant, &enum_definition.variants); | |
1a4d82fc | 387 | } |
223e47cc | 388 | |
e1599b0c | 389 | pub fn walk_variant<'a, V: Visitor<'a>>(visitor: &mut V, variant: &'a Variant) |
dfeec247 XL |
390 | where |
391 | V: Visitor<'a>, | |
3157f602 | 392 | { |
e1599b0c | 393 | visitor.visit_ident(variant.ident); |
60c5eb7d | 394 | visitor.visit_vis(&variant.vis); |
e1599b0c XL |
395 | visitor.visit_variant_data(&variant.data); |
396 | walk_list!(visitor, visit_anon_const, &variant.disr_expr); | |
397 | walk_list!(visitor, visit_attribute, &variant.attrs); | |
398 | } | |
399 | ||
6a06907d | 400 | pub fn walk_expr_field<'a, V: Visitor<'a>>(visitor: &mut V, f: &'a ExprField) { |
e1599b0c XL |
401 | visitor.visit_expr(&f.expr); |
402 | visitor.visit_ident(f.ident); | |
403 | walk_list!(visitor, visit_attribute, f.attrs.iter()); | |
404 | } | |
405 | ||
6a06907d | 406 | pub fn walk_pat_field<'a, V: Visitor<'a>>(visitor: &mut V, fp: &'a PatField) { |
e1599b0c XL |
407 | visitor.visit_ident(fp.ident); |
408 | visitor.visit_pat(&fp.pat); | |
409 | walk_list!(visitor, visit_attribute, fp.attrs.iter()); | |
1a4d82fc JJ |
410 | } |
411 | ||
476ff2be | 412 | pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) { |
e74abb32 | 413 | match typ.kind { |
dfeec247 XL |
414 | TyKind::Slice(ref ty) | TyKind::Paren(ref ty) => visitor.visit_ty(ty), |
415 | TyKind::Ptr(ref mutable_type) => visitor.visit_ty(&mutable_type.ty), | |
7453a54e | 416 | TyKind::Rptr(ref opt_lifetime, ref mutable_type) => { |
923072b8 | 417 | walk_list!(visitor, visit_lifetime, opt_lifetime, LifetimeCtxt::Rptr); |
b039eaaf | 418 | visitor.visit_ty(&mutable_type.ty) |
1a4d82fc | 419 | } |
7453a54e | 420 | TyKind::Tup(ref tuple_element_types) => { |
b039eaaf | 421 | walk_list!(visitor, visit_ty, tuple_element_types); |
1a4d82fc | 422 | } |
7453a54e | 423 | TyKind::BareFn(ref function_declaration) => { |
ff7c6d11 | 424 | walk_list!(visitor, visit_generic_param, &function_declaration.generic_params); |
94b46f34 | 425 | walk_fn_decl(visitor, &function_declaration.decl); |
1a4d82fc | 426 | } |
7453a54e | 427 | TyKind::Path(ref maybe_qself, ref path) => { |
c34b1796 AL |
428 | if let Some(ref qself) = *maybe_qself { |
429 | visitor.visit_ty(&qself.ty); | |
430 | } | |
431 | visitor.visit_path(path, typ.id); | |
1a4d82fc | 432 | } |
94b46f34 | 433 | TyKind::Array(ref ty, ref length) => { |
b039eaaf | 434 | visitor.visit_ty(ty); |
94b46f34 | 435 | visitor.visit_anon_const(length) |
1a4d82fc | 436 | } |
04454e1e FG |
437 | TyKind::TraitObject(ref bounds, ..) => { |
438 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::TraitObject); | |
439 | } | |
440 | TyKind::ImplTrait(_, ref bounds) => { | |
441 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Impl); | |
5bcae85e | 442 | } |
dfeec247 | 443 | TyKind::Typeof(ref expression) => visitor.visit_anon_const(expression), |
cc61c64b | 444 | TyKind::Infer | TyKind::ImplicitSelf | TyKind::Err => {} |
29967ef6 | 445 | TyKind::MacCall(ref mac) => visitor.visit_mac_call(mac), |
dfeec247 | 446 | TyKind::Never | TyKind::CVarArgs => {} |
1a4d82fc JJ |
447 | } |
448 | } | |
449 | ||
476ff2be | 450 | pub fn walk_path<'a, V: Visitor<'a>>(visitor: &mut V, path: &'a Path) { |
85aaf69f | 451 | for segment in &path.segments { |
1a4d82fc JJ |
452 | visitor.visit_path_segment(path.span, segment); |
453 | } | |
454 | } | |
455 | ||
dfeec247 | 456 | pub fn walk_use_tree<'a, V: Visitor<'a>>(visitor: &mut V, use_tree: &'a UseTree, id: NodeId) { |
ff7c6d11 | 457 | visitor.visit_path(&use_tree.prefix, id); |
ff7c6d11 | 458 | match use_tree.kind { |
94b46f34 | 459 | UseTreeKind::Simple(rename, ..) => { |
e1599b0c | 460 | // The extra IDs are handled during HIR lowering. |
0531ce1d | 461 | if let Some(rename) = rename { |
83c7162d | 462 | visitor.visit_ident(rename); |
0531ce1d | 463 | } |
ff7c6d11 | 464 | } |
dfeec247 | 465 | UseTreeKind::Glob => {} |
ff7c6d11 XL |
466 | UseTreeKind::Nested(ref use_trees) => { |
467 | for &(ref nested_tree, nested_id) in use_trees { | |
468 | visitor.visit_use_tree(nested_tree, nested_id, true); | |
469 | } | |
470 | } | |
471 | } | |
b039eaaf SL |
472 | } |
473 | ||
dfeec247 XL |
474 | pub fn walk_path_segment<'a, V: Visitor<'a>>( |
475 | visitor: &mut V, | |
476 | path_span: Span, | |
477 | segment: &'a PathSegment, | |
478 | ) { | |
83c7162d | 479 | visitor.visit_ident(segment.ident); |
8faf50e0 XL |
480 | if let Some(ref args) = segment.args { |
481 | visitor.visit_generic_args(path_span, args); | |
32a655c1 | 482 | } |
1a4d82fc JJ |
483 | } |
484 | ||
dfeec247 XL |
485 | pub fn walk_generic_args<'a, V>(visitor: &mut V, _path_span: Span, generic_args: &'a GenericArgs) |
486 | where | |
487 | V: Visitor<'a>, | |
3157f602 | 488 | { |
8faf50e0 XL |
489 | match *generic_args { |
490 | GenericArgs::AngleBracketed(ref data) => { | |
ba9703b0 XL |
491 | for arg in &data.args { |
492 | match arg { | |
493 | AngleBracketedArg::Arg(a) => visitor.visit_generic_arg(a), | |
5099ac24 | 494 | AngleBracketedArg::Constraint(c) => visitor.visit_assoc_constraint(c), |
ba9703b0 XL |
495 | } |
496 | } | |
1a4d82fc | 497 | } |
8faf50e0 | 498 | GenericArgs::Parenthesized(ref data) => { |
b039eaaf | 499 | walk_list!(visitor, visit_ty, &data.inputs); |
dfeec247 | 500 | walk_fn_ret_ty(visitor, &data.output); |
1a4d82fc JJ |
501 | } |
502 | } | |
503 | } | |
504 | ||
29967ef6 XL |
505 | pub fn walk_generic_arg<'a, V>(visitor: &mut V, generic_arg: &'a GenericArg) |
506 | where | |
507 | V: Visitor<'a>, | |
508 | { | |
509 | match generic_arg { | |
923072b8 | 510 | GenericArg::Lifetime(lt) => visitor.visit_lifetime(lt, LifetimeCtxt::GenericArg), |
29967ef6 XL |
511 | GenericArg::Type(ty) => visitor.visit_ty(ty), |
512 | GenericArg::Const(ct) => visitor.visit_anon_const(ct), | |
513 | } | |
514 | } | |
515 | ||
5099ac24 | 516 | pub fn walk_assoc_constraint<'a, V: Visitor<'a>>(visitor: &mut V, constraint: &'a AssocConstraint) { |
dc9dc135 | 517 | visitor.visit_ident(constraint.ident); |
fc512014 XL |
518 | if let Some(ref gen_args) = constraint.gen_args { |
519 | visitor.visit_generic_args(gen_args.span(), gen_args); | |
520 | } | |
dc9dc135 | 521 | match constraint.kind { |
5099ac24 FG |
522 | AssocConstraintKind::Equality { ref term } => match term { |
523 | Term::Ty(ty) => visitor.visit_ty(ty), | |
524 | Term::Const(c) => visitor.visit_anon_const(c), | |
525 | }, | |
526 | AssocConstraintKind::Bound { ref bounds } => { | |
04454e1e | 527 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
dc9dc135 XL |
528 | } |
529 | } | |
1a4d82fc JJ |
530 | } |
531 | ||
476ff2be | 532 | pub fn walk_pat<'a, V: Visitor<'a>>(visitor: &mut V, pattern: &'a Pat) { |
e74abb32 | 533 | match pattern.kind { |
17df50a5 XL |
534 | PatKind::TupleStruct(ref opt_qself, ref path, ref elems) => { |
535 | if let Some(ref qself) = *opt_qself { | |
536 | visitor.visit_ty(&qself.ty); | |
537 | } | |
7453a54e | 538 | visitor.visit_path(path, pattern.id); |
416331ca | 539 | walk_list!(visitor, visit_pat, elems); |
7453a54e | 540 | } |
3157f602 XL |
541 | PatKind::Path(ref opt_qself, ref path) => { |
542 | if let Some(ref qself) = *opt_qself { | |
543 | visitor.visit_ty(&qself.ty); | |
544 | } | |
d9579d0f AL |
545 | visitor.visit_path(path, pattern.id) |
546 | } | |
17df50a5 XL |
547 | PatKind::Struct(ref opt_qself, ref path, ref fields, _) => { |
548 | if let Some(ref qself) = *opt_qself { | |
549 | visitor.visit_ty(&qself.ty); | |
550 | } | |
1a4d82fc | 551 | visitor.visit_path(path, pattern.id); |
6a06907d | 552 | walk_list!(visitor, visit_pat_field, fields); |
1a4d82fc | 553 | } |
dfeec247 XL |
554 | PatKind::Box(ref subpattern) |
555 | | PatKind::Ref(ref subpattern, _) | |
556 | | PatKind::Paren(ref subpattern) => visitor.visit_pat(subpattern), | |
83c7162d XL |
557 | PatKind::Ident(_, ident, ref optional_subpattern) => { |
558 | visitor.visit_ident(ident); | |
b039eaaf | 559 | walk_list!(visitor, visit_pat, optional_subpattern); |
223e47cc | 560 | } |
7453a54e | 561 | PatKind::Lit(ref expression) => visitor.visit_expr(expression), |
32a655c1 | 562 | PatKind::Range(ref lower_bound, ref upper_bound, _) => { |
dfeec247 XL |
563 | walk_list!(visitor, visit_expr, lower_bound); |
564 | walk_list!(visitor, visit_expr, upper_bound); | |
223e47cc | 565 | } |
dfeec247 XL |
566 | PatKind::Wild | PatKind::Rest => {} |
567 | PatKind::Tuple(ref elems) | PatKind::Slice(ref elems) | PatKind::Or(ref elems) => { | |
416331ca | 568 | walk_list!(visitor, visit_pat, elems); |
223e47cc | 569 | } |
29967ef6 | 570 | PatKind::MacCall(ref mac) => visitor.visit_mac_call(mac), |
1a4d82fc JJ |
571 | } |
572 | } | |
573 | ||
74b04a01 XL |
574 | pub fn walk_foreign_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a ForeignItem) { |
575 | let Item { id, span, ident, ref vis, ref attrs, ref kind, tokens: _ } = *item; | |
576 | visitor.visit_vis(vis); | |
577 | visitor.visit_ident(ident); | |
578 | walk_list!(visitor, visit_attribute, attrs); | |
579 | match kind { | |
580 | ForeignItemKind::Static(ty, _, expr) => { | |
581 | visitor.visit_ty(ty); | |
582 | walk_list!(visitor, visit_expr, expr); | |
583 | } | |
3c0e092e | 584 | ForeignItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { |
04454e1e | 585 | let kind = FnKind::Fn(FnCtxt::Foreign, ident, sig, vis, generics, body.as_deref()); |
74b04a01 XL |
586 | visitor.visit_fn(kind, span, id); |
587 | } | |
5e7ed085 | 588 | ForeignItemKind::TyAlias(box TyAlias { generics, bounds, ty, .. }) => { |
74b04a01 | 589 | visitor.visit_generics(generics); |
04454e1e | 590 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
74b04a01 XL |
591 | walk_list!(visitor, visit_ty, ty); |
592 | } | |
ba9703b0 | 593 | ForeignItemKind::MacCall(mac) => { |
29967ef6 | 594 | visitor.visit_mac_call(mac); |
1a4d82fc | 595 | } |
223e47cc | 596 | } |
1a4d82fc JJ |
597 | } |
598 | ||
8faf50e0 | 599 | pub fn walk_param_bound<'a, V: Visitor<'a>>(visitor: &mut V, bound: &'a GenericBound) { |
1a4d82fc | 600 | match *bound { |
8faf50e0 | 601 | GenericBound::Trait(ref typ, ref modifier) => visitor.visit_poly_trait_ref(typ, modifier), |
923072b8 FG |
602 | GenericBound::Outlives(ref lifetime) => { |
603 | visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound) | |
604 | } | |
223e47cc LB |
605 | } |
606 | } | |
607 | ||
ff7c6d11 | 608 | pub fn walk_generic_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a GenericParam) { |
8faf50e0 XL |
609 | visitor.visit_ident(param.ident); |
610 | walk_list!(visitor, visit_attribute, param.attrs.iter()); | |
04454e1e | 611 | walk_list!(visitor, visit_param_bound, ¶m.bounds, BoundKind::Bound); |
8faf50e0 | 612 | match param.kind { |
dc9dc135 | 613 | GenericParamKind::Lifetime => (), |
8faf50e0 | 614 | GenericParamKind::Type { ref default } => walk_list!(visitor, visit_ty, default), |
5869c6ff XL |
615 | GenericParamKind::Const { ref ty, ref default, .. } => { |
616 | visitor.visit_ty(ty); | |
617 | if let Some(default) = default { | |
618 | visitor.visit_anon_const(default); | |
619 | } | |
620 | } | |
1a4d82fc | 621 | } |
ff7c6d11 XL |
622 | } |
623 | ||
624 | pub fn walk_generics<'a, V: Visitor<'a>>(visitor: &mut V, generics: &'a Generics) { | |
625 | walk_list!(visitor, visit_generic_param, &generics.params); | |
8bb4bdeb XL |
626 | walk_list!(visitor, visit_where_predicate, &generics.where_clause.predicates); |
627 | } | |
628 | ||
064997fb FG |
629 | pub fn walk_closure_binder<'a, V: Visitor<'a>>(visitor: &mut V, binder: &'a ClosureBinder) { |
630 | match binder { | |
631 | ClosureBinder::NotPresent => {} | |
632 | ClosureBinder::For { generic_params, span: _ } => { | |
633 | walk_list!(visitor, visit_generic_param, generic_params) | |
634 | } | |
635 | } | |
636 | } | |
637 | ||
8bb4bdeb XL |
638 | pub fn walk_where_predicate<'a, V: Visitor<'a>>(visitor: &mut V, predicate: &'a WherePredicate) { |
639 | match *predicate { | |
dfeec247 XL |
640 | WherePredicate::BoundPredicate(WhereBoundPredicate { |
641 | ref bounded_ty, | |
642 | ref bounds, | |
643 | ref bound_generic_params, | |
644 | .. | |
645 | }) => { | |
8bb4bdeb | 646 | visitor.visit_ty(bounded_ty); |
04454e1e | 647 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
ff7c6d11 | 648 | walk_list!(visitor, visit_generic_param, bound_generic_params); |
8bb4bdeb | 649 | } |
dfeec247 XL |
650 | WherePredicate::RegionPredicate(WhereRegionPredicate { |
651 | ref lifetime, ref bounds, .. | |
652 | }) => { | |
923072b8 | 653 | visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound); |
04454e1e | 654 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
8bb4bdeb | 655 | } |
dfeec247 | 656 | WherePredicate::EqPredicate(WhereEqPredicate { ref lhs_ty, ref rhs_ty, .. }) => { |
8bb4bdeb XL |
657 | visitor.visit_ty(lhs_ty); |
658 | visitor.visit_ty(rhs_ty); | |
223e47cc LB |
659 | } |
660 | } | |
661 | } | |
662 | ||
74b04a01 XL |
663 | pub fn walk_fn_ret_ty<'a, V: Visitor<'a>>(visitor: &mut V, ret_ty: &'a FnRetTy) { |
664 | if let FnRetTy::Ty(ref output_ty) = *ret_ty { | |
b039eaaf | 665 | visitor.visit_ty(output_ty) |
223e47cc LB |
666 | } |
667 | } | |
668 | ||
476ff2be | 669 | pub fn walk_fn_decl<'a, V: Visitor<'a>>(visitor: &mut V, function_declaration: &'a FnDecl) { |
e1599b0c XL |
670 | for param in &function_declaration.inputs { |
671 | visitor.visit_param(param); | |
223e47cc | 672 | } |
416331ca | 673 | visitor.visit_fn_ret_ty(&function_declaration.output); |
223e47cc LB |
674 | } |
675 | ||
74b04a01 | 676 | pub fn walk_fn<'a, V: Visitor<'a>>(visitor: &mut V, kind: FnKind<'a>, _span: Span) { |
476ff2be | 677 | match kind { |
04454e1e FG |
678 | FnKind::Fn(_, _, sig, _, generics, body) => { |
679 | visitor.visit_generics(generics); | |
532ac7d7 | 680 | visitor.visit_fn_header(&sig.header); |
74b04a01 XL |
681 | walk_fn_decl(visitor, &sig.decl); |
682 | walk_list!(visitor, visit_block, body); | |
476ff2be | 683 | } |
064997fb FG |
684 | FnKind::Closure(binder, decl, body) => { |
685 | visitor.visit_closure_binder(binder); | |
74b04a01 | 686 | walk_fn_decl(visitor, decl); |
476ff2be | 687 | visitor.visit_expr(body); |
1a4d82fc | 688 | } |
1a4d82fc | 689 | } |
b039eaaf | 690 | } |
1a4d82fc | 691 | |
74b04a01 XL |
692 | pub fn walk_assoc_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a AssocItem, ctxt: AssocCtxt) { |
693 | let Item { id, span, ident, ref vis, ref attrs, ref kind, tokens: _ } = *item; | |
694 | visitor.visit_vis(vis); | |
695 | visitor.visit_ident(ident); | |
696 | walk_list!(visitor, visit_attribute, attrs); | |
697 | match kind { | |
698 | AssocItemKind::Const(_, ty, expr) => { | |
d9579d0f | 699 | visitor.visit_ty(ty); |
dfeec247 | 700 | walk_list!(visitor, visit_expr, expr); |
d9579d0f | 701 | } |
3c0e092e | 702 | AssocItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { |
04454e1e | 703 | let kind = FnKind::Fn(FnCtxt::Assoc(ctxt), ident, sig, vis, generics, body.as_deref()); |
74b04a01 | 704 | visitor.visit_fn(kind, span, id); |
c34b1796 | 705 | } |
5e7ed085 | 706 | AssocItemKind::TyAlias(box TyAlias { generics, bounds, ty, .. }) => { |
74b04a01 | 707 | visitor.visit_generics(generics); |
04454e1e | 708 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
dfeec247 | 709 | walk_list!(visitor, visit_ty, ty); |
d9579d0f | 710 | } |
ba9703b0 | 711 | AssocItemKind::MacCall(mac) => { |
29967ef6 | 712 | visitor.visit_mac_call(mac); |
1a4d82fc | 713 | } |
223e47cc LB |
714 | } |
715 | } | |
716 | ||
476ff2be | 717 | pub fn walk_struct_def<'a, V: Visitor<'a>>(visitor: &mut V, struct_definition: &'a VariantData) { |
6a06907d | 718 | walk_list!(visitor, visit_field_def, struct_definition.fields()); |
223e47cc LB |
719 | } |
720 | ||
6a06907d XL |
721 | pub fn walk_field_def<'a, V: Visitor<'a>>(visitor: &mut V, field: &'a FieldDef) { |
722 | visitor.visit_vis(&field.vis); | |
723 | if let Some(ident) = field.ident { | |
83c7162d | 724 | visitor.visit_ident(ident); |
2c00a5a8 | 725 | } |
6a06907d XL |
726 | visitor.visit_ty(&field.ty); |
727 | walk_list!(visitor, visit_attribute, &field.attrs); | |
223e47cc LB |
728 | } |
729 | ||
476ff2be | 730 | pub fn walk_block<'a, V: Visitor<'a>>(visitor: &mut V, block: &'a Block) { |
b039eaaf | 731 | walk_list!(visitor, visit_stmt, &block.stmts); |
223e47cc LB |
732 | } |
733 | ||
476ff2be | 734 | pub fn walk_stmt<'a, V: Visitor<'a>>(visitor: &mut V, statement: &'a Stmt) { |
e74abb32 | 735 | match statement.kind { |
3157f602 XL |
736 | StmtKind::Local(ref local) => visitor.visit_local(local), |
737 | StmtKind::Item(ref item) => visitor.visit_item(item), | |
74b04a01 XL |
738 | StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => visitor.visit_expr(expr), |
739 | StmtKind::Empty => {} | |
ba9703b0 | 740 | StmtKind::MacCall(ref mac) => { |
fc512014 | 741 | let MacCallStmt { ref mac, style: _, ref attrs, tokens: _ } = **mac; |
29967ef6 | 742 | visitor.visit_mac_call(mac); |
3157f602 | 743 | for attr in attrs.iter() { |
92a42be0 SL |
744 | visitor.visit_attribute(attr); |
745 | } | |
746 | } | |
223e47cc LB |
747 | } |
748 | } | |
749 | ||
ba9703b0 | 750 | pub fn walk_mac<'a, V: Visitor<'a>>(visitor: &mut V, mac: &'a MacCall) { |
e1599b0c | 751 | visitor.visit_path(&mac.path, DUMMY_NODE_ID); |
223e47cc LB |
752 | } |
753 | ||
94b46f34 XL |
754 | pub fn walk_anon_const<'a, V: Visitor<'a>>(visitor: &mut V, constant: &'a AnonConst) { |
755 | visitor.visit_expr(&constant.value); | |
756 | } | |
757 | ||
04454e1e | 758 | pub fn walk_inline_asm<'a, V: Visitor<'a>>(visitor: &mut V, asm: &'a InlineAsm) { |
17df50a5 XL |
759 | for (op, _) in &asm.operands { |
760 | match op { | |
761 | InlineAsmOperand::In { expr, .. } | |
94222f64 | 762 | | InlineAsmOperand::Out { expr: Some(expr), .. } |
04454e1e | 763 | | InlineAsmOperand::InOut { expr, .. } => visitor.visit_expr(expr), |
94222f64 | 764 | InlineAsmOperand::Out { expr: None, .. } => {} |
17df50a5 XL |
765 | InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => { |
766 | visitor.visit_expr(in_expr); | |
767 | if let Some(out_expr) = out_expr { | |
768 | visitor.visit_expr(out_expr); | |
769 | } | |
770 | } | |
771 | InlineAsmOperand::Const { anon_const, .. } => visitor.visit_anon_const(anon_const), | |
04454e1e | 772 | InlineAsmOperand::Sym { sym } => visitor.visit_inline_asm_sym(sym), |
17df50a5 XL |
773 | } |
774 | } | |
775 | } | |
776 | ||
04454e1e FG |
777 | pub fn walk_inline_asm_sym<'a, V: Visitor<'a>>(visitor: &mut V, sym: &'a InlineAsmSym) { |
778 | if let Some(ref qself) = sym.qself { | |
779 | visitor.visit_ty(&qself.ty); | |
780 | } | |
781 | visitor.visit_path(&sym.path, sym.id); | |
782 | } | |
783 | ||
476ff2be | 784 | pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) { |
e1599b0c XL |
785 | walk_list!(visitor, visit_attribute, expression.attrs.iter()); |
786 | ||
e74abb32 | 787 | match expression.kind { |
dfeec247 | 788 | ExprKind::Box(ref subexpression) => visitor.visit_expr(subexpression), |
32a655c1 | 789 | ExprKind::Array(ref subexpressions) => { |
b039eaaf | 790 | walk_list!(visitor, visit_expr, subexpressions); |
1a4d82fc | 791 | } |
29967ef6 | 792 | ExprKind::ConstBlock(ref anon_const) => visitor.visit_anon_const(anon_const), |
7453a54e | 793 | ExprKind::Repeat(ref element, ref count) => { |
b039eaaf | 794 | visitor.visit_expr(element); |
94b46f34 | 795 | visitor.visit_anon_const(count) |
1a4d82fc | 796 | } |
6a06907d | 797 | ExprKind::Struct(ref se) => { |
17df50a5 XL |
798 | if let Some(ref qself) = se.qself { |
799 | visitor.visit_ty(&qself.ty); | |
800 | } | |
6a06907d XL |
801 | visitor.visit_path(&se.path, expression.id); |
802 | walk_list!(visitor, visit_expr_field, &se.fields); | |
803 | match &se.rest { | |
29967ef6 XL |
804 | StructRest::Base(expr) => visitor.visit_expr(expr), |
805 | StructRest::Rest(_span) => {} | |
806 | StructRest::None => {} | |
807 | } | |
223e47cc | 808 | } |
7453a54e | 809 | ExprKind::Tup(ref subexpressions) => { |
b039eaaf | 810 | walk_list!(visitor, visit_expr, subexpressions); |
223e47cc | 811 | } |
7453a54e | 812 | ExprKind::Call(ref callee_expression, ref arguments) => { |
9e0c209e | 813 | visitor.visit_expr(callee_expression); |
b039eaaf | 814 | walk_list!(visitor, visit_expr, arguments); |
1a4d82fc | 815 | } |
f035d41b | 816 | ExprKind::MethodCall(ref segment, ref arguments, _span) => { |
041b39d2 | 817 | visitor.visit_path_segment(expression.span, segment); |
9e0c209e | 818 | walk_list!(visitor, visit_expr, arguments); |
223e47cc | 819 | } |
7453a54e | 820 | ExprKind::Binary(_, ref left_expression, ref right_expression) => { |
b039eaaf SL |
821 | visitor.visit_expr(left_expression); |
822 | visitor.visit_expr(right_expression) | |
1a4d82fc | 823 | } |
60c5eb7d | 824 | ExprKind::AddrOf(_, _, ref subexpression) | ExprKind::Unary(_, ref subexpression) => { |
b039eaaf | 825 | visitor.visit_expr(subexpression) |
1a4d82fc | 826 | } |
7453a54e | 827 | ExprKind::Cast(ref subexpression, ref typ) | ExprKind::Type(ref subexpression, ref typ) => { |
b039eaaf SL |
828 | visitor.visit_expr(subexpression); |
829 | visitor.visit_ty(typ) | |
1a4d82fc | 830 | } |
94222f64 | 831 | ExprKind::Let(ref pat, ref expr, _) => { |
e1599b0c | 832 | visitor.visit_pat(pat); |
94222f64 | 833 | visitor.visit_expr(expr); |
dc9dc135 | 834 | } |
7453a54e | 835 | ExprKind::If(ref head_expression, ref if_block, ref optional_else) => { |
b039eaaf SL |
836 | visitor.visit_expr(head_expression); |
837 | visitor.visit_block(if_block); | |
838 | walk_list!(visitor, visit_expr, optional_else); | |
1a4d82fc | 839 | } |
2c00a5a8 XL |
840 | ExprKind::While(ref subexpression, ref block, ref opt_label) => { |
841 | walk_list!(visitor, visit_label, opt_label); | |
b039eaaf SL |
842 | visitor.visit_expr(subexpression); |
843 | visitor.visit_block(block); | |
1a4d82fc | 844 | } |
2c00a5a8 XL |
845 | ExprKind::ForLoop(ref pattern, ref subexpression, ref block, ref opt_label) => { |
846 | walk_list!(visitor, visit_label, opt_label); | |
b039eaaf SL |
847 | visitor.visit_pat(pattern); |
848 | visitor.visit_expr(subexpression); | |
849 | visitor.visit_block(block); | |
b039eaaf | 850 | } |
2c00a5a8 XL |
851 | ExprKind::Loop(ref block, ref opt_label) => { |
852 | walk_list!(visitor, visit_label, opt_label); | |
b039eaaf | 853 | visitor.visit_block(block); |
b039eaaf | 854 | } |
7453a54e | 855 | ExprKind::Match(ref subexpression, ref arms) => { |
b039eaaf SL |
856 | visitor.visit_expr(subexpression); |
857 | walk_list!(visitor, visit_arm, arms); | |
223e47cc | 858 | } |
064997fb FG |
859 | ExprKind::Closure(ref binder, _, _, _, ref decl, ref body, _decl_span) => { |
860 | visitor.visit_fn(FnKind::Closure(binder, decl, body), expression.span, expression.id) | |
74b04a01 | 861 | } |
94b46f34 XL |
862 | ExprKind::Block(ref block, ref opt_label) => { |
863 | walk_list!(visitor, visit_label, opt_label); | |
864 | visitor.visit_block(block); | |
865 | } | |
8faf50e0 XL |
866 | ExprKind::Async(_, _, ref body) => { |
867 | visitor.visit_block(body); | |
868 | } | |
416331ca | 869 | ExprKind::Await(ref expr) => visitor.visit_expr(expr), |
dfeec247 XL |
870 | ExprKind::Assign(ref lhs, ref rhs, _) => { |
871 | visitor.visit_expr(lhs); | |
872 | visitor.visit_expr(rhs); | |
1a4d82fc | 873 | } |
7453a54e | 874 | ExprKind::AssignOp(_, ref left_expression, ref right_expression) => { |
9e0c209e | 875 | visitor.visit_expr(left_expression); |
b039eaaf | 876 | visitor.visit_expr(right_expression); |
223e47cc | 877 | } |
83c7162d | 878 | ExprKind::Field(ref subexpression, ident) => { |
b039eaaf | 879 | visitor.visit_expr(subexpression); |
83c7162d | 880 | visitor.visit_ident(ident); |
223e47cc | 881 | } |
7453a54e | 882 | ExprKind::Index(ref main_expression, ref index_expression) => { |
b039eaaf SL |
883 | visitor.visit_expr(main_expression); |
884 | visitor.visit_expr(index_expression) | |
223e47cc | 885 | } |
54a0048b | 886 | ExprKind::Range(ref start, ref end, _) => { |
b039eaaf SL |
887 | walk_list!(visitor, visit_expr, start); |
888 | walk_list!(visitor, visit_expr, end); | |
223e47cc | 889 | } |
fc512014 | 890 | ExprKind::Underscore => {} |
7453a54e | 891 | ExprKind::Path(ref maybe_qself, ref path) => { |
c34b1796 AL |
892 | if let Some(ref qself) = *maybe_qself { |
893 | visitor.visit_ty(&qself.ty); | |
894 | } | |
1a4d82fc | 895 | visitor.visit_path(path, expression.id) |
223e47cc | 896 | } |
2c00a5a8 XL |
897 | ExprKind::Break(ref opt_label, ref opt_expr) => { |
898 | walk_list!(visitor, visit_label, opt_label); | |
476ff2be SL |
899 | walk_list!(visitor, visit_expr, opt_expr); |
900 | } | |
2c00a5a8 XL |
901 | ExprKind::Continue(ref opt_label) => { |
902 | walk_list!(visitor, visit_label, opt_label); | |
b039eaaf | 903 | } |
7453a54e | 904 | ExprKind::Ret(ref optional_expression) => { |
b039eaaf | 905 | walk_list!(visitor, visit_expr, optional_expression); |
1a4d82fc | 906 | } |
04454e1e FG |
907 | ExprKind::Yeet(ref optional_expression) => { |
908 | walk_list!(visitor, visit_expr, optional_expression); | |
909 | } | |
29967ef6 | 910 | ExprKind::MacCall(ref mac) => visitor.visit_mac_call(mac), |
dfeec247 | 911 | ExprKind::Paren(ref subexpression) => visitor.visit_expr(subexpression), |
923072b8 | 912 | ExprKind::InlineAsm(ref asm) => visitor.visit_inline_asm(asm), |
ea8adc8c XL |
913 | ExprKind::Yield(ref optional_expression) => { |
914 | walk_list!(visitor, visit_expr, optional_expression); | |
915 | } | |
dfeec247 XL |
916 | ExprKind::Try(ref subexpression) => visitor.visit_expr(subexpression), |
917 | ExprKind::TryBlock(ref body) => visitor.visit_block(body), | |
dc9dc135 | 918 | ExprKind::Lit(_) | ExprKind::Err => {} |
1a4d82fc JJ |
919 | } |
920 | ||
921 | visitor.visit_expr_post(expression) | |
922 | } | |
923 | ||
e1599b0c XL |
924 | pub fn walk_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a Param) { |
925 | walk_list!(visitor, visit_attribute, param.attrs.iter()); | |
926 | visitor.visit_pat(¶m.pat); | |
927 | visitor.visit_ty(¶m.ty); | |
416331ca XL |
928 | } |
929 | ||
476ff2be | 930 | pub fn walk_arm<'a, V: Visitor<'a>>(visitor: &mut V, arm: &'a Arm) { |
e1599b0c | 931 | visitor.visit_pat(&arm.pat); |
e1599b0c | 932 | walk_list!(visitor, visit_expr, &arm.guard); |
b039eaaf SL |
933 | visitor.visit_expr(&arm.body); |
934 | walk_list!(visitor, visit_attribute, &arm.attrs); | |
223e47cc | 935 | } |
54a0048b | 936 | |
476ff2be | 937 | pub fn walk_vis<'a, V: Visitor<'a>>(visitor: &mut V, vis: &'a Visibility) { |
1b1a35ee | 938 | if let VisibilityKind::Restricted { ref path, id } = vis.kind { |
a7813a04 | 939 | visitor.visit_path(path, id); |
54a0048b SL |
940 | } |
941 | } | |
abe05a73 XL |
942 | |
943 | pub fn walk_attribute<'a, V: Visitor<'a>>(visitor: &mut V, attr: &'a Attribute) { | |
60c5eb7d | 944 | match attr.kind { |
29967ef6 | 945 | AttrKind::Normal(ref item, ref _tokens) => walk_mac_args(visitor, &item.args), |
3dfed10e | 946 | AttrKind::DocComment(..) => {} |
60c5eb7d XL |
947 | } |
948 | } | |
949 | ||
950 | pub fn walk_mac_args<'a, V: Visitor<'a>>(visitor: &mut V, args: &'a MacArgs) { | |
951 | match args { | |
952 | MacArgs::Empty => {} | |
29967ef6 | 953 | MacArgs::Delimited(_dspan, _delim, _tokens) => {} |
04454e1e FG |
954 | MacArgs::Eq(_eq_span, MacArgsEq::Ast(expr)) => visitor.visit_expr(expr), |
955 | MacArgs::Eq(_, MacArgsEq::Hir(lit)) => { | |
956 | unreachable!("in literal form when walking mac args eq: {:?}", lit) | |
957 | } | |
abe05a73 XL |
958 | } |
959 | } |