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Commit | Line | Data |
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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 | } | |
2b03887a FG |
143 | /// This method is a hack to workaround unstable of `stmt_expr_attributes`. |
144 | /// It can be removed once that feature is stabilized. | |
145 | fn visit_method_receiver_expr(&mut self, ex: &'ast Expr) { | |
146 | self.visit_expr(ex) | |
147 | } | |
dfeec247 XL |
148 | fn visit_expr_post(&mut self, _ex: &'ast Expr) {} |
149 | fn visit_ty(&mut self, t: &'ast Ty) { | |
150 | walk_ty(self, t) | |
151 | } | |
8faf50e0 XL |
152 | fn visit_generic_param(&mut self, param: &'ast GenericParam) { |
153 | walk_generic_param(self, param) | |
154 | } | |
dfeec247 XL |
155 | fn visit_generics(&mut self, g: &'ast Generics) { |
156 | walk_generics(self, g) | |
157 | } | |
064997fb FG |
158 | fn visit_closure_binder(&mut self, b: &'ast ClosureBinder) { |
159 | walk_closure_binder(self, b) | |
160 | } | |
8bb4bdeb XL |
161 | fn visit_where_predicate(&mut self, p: &'ast WherePredicate) { |
162 | walk_where_predicate(self, p) | |
163 | } | |
f2b60f7d FG |
164 | fn visit_fn(&mut self, fk: FnKind<'ast>, _: Span, _: NodeId) { |
165 | walk_fn(self, fk) | |
476ff2be | 166 | } |
74b04a01 XL |
167 | fn visit_assoc_item(&mut self, i: &'ast AssocItem, ctxt: AssocCtxt) { |
168 | walk_assoc_item(self, i, ctxt) | |
dfeec247 XL |
169 | } |
170 | fn visit_trait_ref(&mut self, t: &'ast TraitRef) { | |
171 | walk_trait_ref(self, t) | |
172 | } | |
04454e1e | 173 | fn visit_param_bound(&mut self, bounds: &'ast GenericBound, _ctxt: BoundKind) { |
8faf50e0 | 174 | walk_param_bound(self, bounds) |
1a4d82fc | 175 | } |
f2b60f7d FG |
176 | fn visit_poly_trait_ref(&mut self, t: &'ast PolyTraitRef) { |
177 | walk_poly_trait_ref(self, t) | |
1a4d82fc | 178 | } |
e1599b0c | 179 | fn visit_variant_data(&mut self, s: &'ast VariantData) { |
1a4d82fc JJ |
180 | walk_struct_def(self, s) |
181 | } | |
6a06907d XL |
182 | fn visit_field_def(&mut self, s: &'ast FieldDef) { |
183 | walk_field_def(self, s) | |
dfeec247 | 184 | } |
f2b60f7d FG |
185 | fn visit_enum_def(&mut self, enum_definition: &'ast EnumDef) { |
186 | walk_enum_def(self, enum_definition) | |
c1a9b12d | 187 | } |
e1599b0c XL |
188 | fn visit_variant(&mut self, v: &'ast Variant) { |
189 | walk_variant(self, v) | |
1a4d82fc | 190 | } |
2c00a5a8 XL |
191 | fn visit_label(&mut self, label: &'ast Label) { |
192 | walk_label(self, label) | |
193 | } | |
923072b8 | 194 | fn visit_lifetime(&mut self, lifetime: &'ast Lifetime, _: LifetimeCtxt) { |
b039eaaf | 195 | walk_lifetime(self, lifetime) |
1a4d82fc | 196 | } |
29967ef6 XL |
197 | fn visit_mac_call(&mut self, mac: &'ast MacCall) { |
198 | walk_mac(self, mac) | |
1a4d82fc | 199 | } |
7cac9316 XL |
200 | fn visit_mac_def(&mut self, _mac: &'ast MacroDef, _id: NodeId) { |
201 | // Nothing to do | |
202 | } | |
476ff2be | 203 | fn visit_path(&mut self, path: &'ast Path, _id: NodeId) { |
1a4d82fc JJ |
204 | walk_path(self, path) |
205 | } | |
ff7c6d11 XL |
206 | fn visit_use_tree(&mut self, use_tree: &'ast UseTree, id: NodeId, _nested: bool) { |
207 | walk_use_tree(self, use_tree, id) | |
b039eaaf | 208 | } |
f2b60f7d FG |
209 | fn visit_path_segment(&mut self, path_segment: &'ast PathSegment) { |
210 | walk_path_segment(self, path_segment) | |
1a4d82fc | 211 | } |
f2b60f7d FG |
212 | fn visit_generic_args(&mut self, generic_args: &'ast GenericArgs) { |
213 | walk_generic_args(self, generic_args) | |
8faf50e0 XL |
214 | } |
215 | fn visit_generic_arg(&mut self, generic_arg: &'ast GenericArg) { | |
29967ef6 | 216 | walk_generic_arg(self, generic_arg) |
1a4d82fc | 217 | } |
5099ac24 FG |
218 | fn visit_assoc_constraint(&mut self, constraint: &'ast AssocConstraint) { |
219 | walk_assoc_constraint(self, constraint) | |
1a4d82fc | 220 | } |
abe05a73 XL |
221 | fn visit_attribute(&mut self, attr: &'ast Attribute) { |
222 | walk_attribute(self, attr) | |
223 | } | |
476ff2be | 224 | fn visit_vis(&mut self, vis: &'ast Visibility) { |
54a0048b SL |
225 | walk_vis(self, vis) |
226 | } | |
74b04a01 | 227 | fn visit_fn_ret_ty(&mut self, ret_ty: &'ast FnRetTy) { |
5bcae85e SL |
228 | walk_fn_ret_ty(self, ret_ty) |
229 | } | |
532ac7d7 XL |
230 | fn visit_fn_header(&mut self, _header: &'ast FnHeader) { |
231 | // Nothing to do | |
232 | } | |
6a06907d XL |
233 | fn visit_expr_field(&mut self, f: &'ast ExprField) { |
234 | walk_expr_field(self, f) | |
e1599b0c | 235 | } |
6a06907d XL |
236 | fn visit_pat_field(&mut self, fp: &'ast PatField) { |
237 | walk_pat_field(self, fp) | |
e1599b0c | 238 | } |
a2a8927a XL |
239 | fn visit_crate(&mut self, krate: &'ast Crate) { |
240 | walk_crate(self, krate) | |
241 | } | |
04454e1e FG |
242 | fn visit_inline_asm(&mut self, asm: &'ast InlineAsm) { |
243 | walk_inline_asm(self, asm) | |
244 | } | |
245 | fn visit_inline_asm_sym(&mut self, sym: &'ast InlineAsmSym) { | |
246 | walk_inline_asm_sym(self, sym) | |
247 | } | |
223e47cc LB |
248 | } |
249 | ||
b039eaaf SL |
250 | #[macro_export] |
251 | macro_rules! walk_list { | |
2b03887a FG |
252 | ($visitor: expr, $method: ident, $list: expr $(, $($extra_args: expr),* )?) => { |
253 | { | |
254 | #[cfg_attr(not(bootstrap), allow(for_loops_over_fallibles))] | |
255 | for elem in $list { | |
256 | $visitor.$method(elem $(, $($extra_args,)* )?) | |
257 | } | |
b039eaaf | 258 | } |
1a4d82fc JJ |
259 | } |
260 | } | |
261 | ||
476ff2be | 262 | pub fn walk_crate<'a, V: Visitor<'a>>(visitor: &mut V, krate: &'a Crate) { |
6a06907d | 263 | walk_list!(visitor, visit_item, &krate.items); |
b039eaaf | 264 | walk_list!(visitor, visit_attribute, &krate.attrs); |
1a4d82fc JJ |
265 | } |
266 | ||
476ff2be | 267 | pub fn walk_local<'a, V: Visitor<'a>>(visitor: &mut V, local: &'a Local) { |
3157f602 XL |
268 | for attr in local.attrs.iter() { |
269 | visitor.visit_attribute(attr); | |
270 | } | |
b039eaaf SL |
271 | visitor.visit_pat(&local.pat); |
272 | walk_list!(visitor, visit_ty, &local.ty); | |
94222f64 XL |
273 | if let Some((init, els)) = local.kind.init_else_opt() { |
274 | visitor.visit_expr(init); | |
275 | walk_list!(visitor, visit_block, els); | |
276 | } | |
b039eaaf SL |
277 | } |
278 | ||
2c00a5a8 | 279 | pub fn walk_label<'a, V: Visitor<'a>>(visitor: &mut V, label: &'a Label) { |
83c7162d | 280 | visitor.visit_ident(label.ident); |
2c00a5a8 XL |
281 | } |
282 | ||
476ff2be | 283 | pub fn walk_lifetime<'a, V: Visitor<'a>>(visitor: &mut V, lifetime: &'a Lifetime) { |
83c7162d | 284 | visitor.visit_ident(lifetime.ident); |
b039eaaf SL |
285 | } |
286 | ||
f2b60f7d FG |
287 | pub fn walk_poly_trait_ref<'a, V>(visitor: &mut V, trait_ref: &'a PolyTraitRef) |
288 | where | |
dfeec247 | 289 | V: Visitor<'a>, |
1a4d82fc | 290 | { |
ff7c6d11 | 291 | walk_list!(visitor, visit_generic_param, &trait_ref.bound_generic_params); |
1a4d82fc JJ |
292 | visitor.visit_trait_ref(&trait_ref.trait_ref); |
293 | } | |
294 | ||
476ff2be | 295 | pub fn walk_trait_ref<'a, V: Visitor<'a>>(visitor: &mut V, trait_ref: &'a TraitRef) { |
1a4d82fc JJ |
296 | visitor.visit_path(&trait_ref.path, trait_ref.ref_id) |
297 | } | |
298 | ||
476ff2be | 299 | pub fn walk_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a Item) { |
a7813a04 | 300 | visitor.visit_vis(&item.vis); |
83c7162d | 301 | visitor.visit_ident(item.ident); |
e74abb32 | 302 | match item.kind { |
064997fb | 303 | ItemKind::ExternCrate(_) => {} |
dfeec247 | 304 | ItemKind::Use(ref use_tree) => visitor.visit_use_tree(use_tree, item.id, false), |
74b04a01 | 305 | ItemKind::Static(ref typ, _, ref expr) | ItemKind::Const(_, ref typ, ref expr) => { |
b039eaaf | 306 | visitor.visit_ty(typ); |
74b04a01 | 307 | walk_list!(visitor, visit_expr, expr); |
1a4d82fc | 308 | } |
3c0e092e | 309 | ItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { |
04454e1e FG |
310 | let kind = |
311 | FnKind::Fn(FnCtxt::Free, item.ident, sig, &item.vis, generics, body.as_deref()); | |
74b04a01 | 312 | visitor.visit_fn(kind, item.span, item.id) |
dfeec247 | 313 | } |
6a06907d XL |
314 | ItemKind::Mod(_unsafety, ref mod_kind) => match mod_kind { |
315 | ModKind::Loaded(items, _inline, _inner_span) => { | |
316 | walk_list!(visitor, visit_item, items) | |
317 | } | |
318 | ModKind::Unloaded => {} | |
319 | }, | |
7453a54e | 320 | ItemKind::ForeignMod(ref foreign_module) => { |
b039eaaf | 321 | walk_list!(visitor, visit_foreign_item, &foreign_module.items); |
223e47cc | 322 | } |
923072b8 | 323 | ItemKind::GlobalAsm(ref asm) => visitor.visit_inline_asm(asm), |
5e7ed085 | 324 | ItemKind::TyAlias(box TyAlias { ref generics, ref bounds, ref ty, .. }) => { |
74b04a01 | 325 | visitor.visit_generics(generics); |
04454e1e | 326 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
74b04a01 | 327 | walk_list!(visitor, visit_ty, ty); |
1a4d82fc | 328 | } |
532ac7d7 XL |
329 | ItemKind::Enum(ref enum_definition, ref generics) => { |
330 | visitor.visit_generics(generics); | |
f2b60f7d | 331 | visitor.visit_enum_def(enum_definition) |
1a4d82fc | 332 | } |
3c0e092e | 333 | ItemKind::Impl(box Impl { |
dfeec247 | 334 | defaultness: _, |
3c0e092e | 335 | unsafety: _, |
dfeec247 | 336 | ref generics, |
3c0e092e XL |
337 | constness: _, |
338 | polarity: _, | |
dfeec247 XL |
339 | ref of_trait, |
340 | ref self_ty, | |
341 | ref items, | |
5869c6ff | 342 | }) => { |
532ac7d7 | 343 | visitor.visit_generics(generics); |
dfeec247 XL |
344 | walk_list!(visitor, visit_trait_ref, of_trait); |
345 | visitor.visit_ty(self_ty); | |
74b04a01 | 346 | walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Impl); |
970d7e83 | 347 | } |
dfeec247 XL |
348 | ItemKind::Struct(ref struct_definition, ref generics) |
349 | | ItemKind::Union(ref struct_definition, ref generics) => { | |
1a4d82fc | 350 | visitor.visit_generics(generics); |
e1599b0c | 351 | visitor.visit_variant_data(struct_definition); |
1a4d82fc | 352 | } |
3c0e092e XL |
353 | ItemKind::Trait(box Trait { |
354 | unsafety: _, | |
355 | is_auto: _, | |
356 | ref generics, | |
357 | ref bounds, | |
358 | ref items, | |
359 | }) => { | |
1a4d82fc | 360 | visitor.visit_generics(generics); |
04454e1e | 361 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::SuperTraits); |
74b04a01 | 362 | walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Trait); |
1a4d82fc | 363 | } |
ff7c6d11 XL |
364 | ItemKind::TraitAlias(ref generics, ref bounds) => { |
365 | visitor.visit_generics(generics); | |
04454e1e | 366 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
ff7c6d11 | 367 | } |
29967ef6 | 368 | ItemKind::MacCall(ref mac) => visitor.visit_mac_call(mac), |
7cac9316 | 369 | ItemKind::MacroDef(ref ts) => visitor.visit_mac_def(ts, item.id), |
1a4d82fc | 370 | } |
b039eaaf | 371 | walk_list!(visitor, visit_attribute, &item.attrs); |
223e47cc LB |
372 | } |
373 | ||
f2b60f7d | 374 | pub fn walk_enum_def<'a, V: Visitor<'a>>(visitor: &mut V, enum_definition: &'a EnumDef) { |
e1599b0c | 375 | walk_list!(visitor, visit_variant, &enum_definition.variants); |
1a4d82fc | 376 | } |
223e47cc | 377 | |
e1599b0c | 378 | pub fn walk_variant<'a, V: Visitor<'a>>(visitor: &mut V, variant: &'a Variant) |
dfeec247 XL |
379 | where |
380 | V: Visitor<'a>, | |
3157f602 | 381 | { |
e1599b0c | 382 | visitor.visit_ident(variant.ident); |
60c5eb7d | 383 | visitor.visit_vis(&variant.vis); |
e1599b0c XL |
384 | visitor.visit_variant_data(&variant.data); |
385 | walk_list!(visitor, visit_anon_const, &variant.disr_expr); | |
386 | walk_list!(visitor, visit_attribute, &variant.attrs); | |
387 | } | |
388 | ||
6a06907d | 389 | pub fn walk_expr_field<'a, V: Visitor<'a>>(visitor: &mut V, f: &'a ExprField) { |
e1599b0c XL |
390 | visitor.visit_expr(&f.expr); |
391 | visitor.visit_ident(f.ident); | |
392 | walk_list!(visitor, visit_attribute, f.attrs.iter()); | |
393 | } | |
394 | ||
6a06907d | 395 | pub fn walk_pat_field<'a, V: Visitor<'a>>(visitor: &mut V, fp: &'a PatField) { |
e1599b0c XL |
396 | visitor.visit_ident(fp.ident); |
397 | visitor.visit_pat(&fp.pat); | |
398 | walk_list!(visitor, visit_attribute, fp.attrs.iter()); | |
1a4d82fc JJ |
399 | } |
400 | ||
476ff2be | 401 | pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) { |
e74abb32 | 402 | match typ.kind { |
dfeec247 XL |
403 | TyKind::Slice(ref ty) | TyKind::Paren(ref ty) => visitor.visit_ty(ty), |
404 | TyKind::Ptr(ref mutable_type) => visitor.visit_ty(&mutable_type.ty), | |
7453a54e | 405 | TyKind::Rptr(ref opt_lifetime, ref mutable_type) => { |
923072b8 | 406 | walk_list!(visitor, visit_lifetime, opt_lifetime, LifetimeCtxt::Rptr); |
b039eaaf | 407 | visitor.visit_ty(&mutable_type.ty) |
1a4d82fc | 408 | } |
7453a54e | 409 | TyKind::Tup(ref tuple_element_types) => { |
b039eaaf | 410 | walk_list!(visitor, visit_ty, tuple_element_types); |
1a4d82fc | 411 | } |
7453a54e | 412 | TyKind::BareFn(ref function_declaration) => { |
ff7c6d11 | 413 | walk_list!(visitor, visit_generic_param, &function_declaration.generic_params); |
94b46f34 | 414 | walk_fn_decl(visitor, &function_declaration.decl); |
1a4d82fc | 415 | } |
7453a54e | 416 | TyKind::Path(ref maybe_qself, ref path) => { |
c34b1796 AL |
417 | if let Some(ref qself) = *maybe_qself { |
418 | visitor.visit_ty(&qself.ty); | |
419 | } | |
420 | visitor.visit_path(path, typ.id); | |
1a4d82fc | 421 | } |
94b46f34 | 422 | TyKind::Array(ref ty, ref length) => { |
b039eaaf | 423 | visitor.visit_ty(ty); |
94b46f34 | 424 | visitor.visit_anon_const(length) |
1a4d82fc | 425 | } |
04454e1e FG |
426 | TyKind::TraitObject(ref bounds, ..) => { |
427 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::TraitObject); | |
428 | } | |
429 | TyKind::ImplTrait(_, ref bounds) => { | |
430 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Impl); | |
5bcae85e | 431 | } |
dfeec247 | 432 | TyKind::Typeof(ref expression) => visitor.visit_anon_const(expression), |
cc61c64b | 433 | TyKind::Infer | TyKind::ImplicitSelf | TyKind::Err => {} |
29967ef6 | 434 | TyKind::MacCall(ref mac) => visitor.visit_mac_call(mac), |
dfeec247 | 435 | TyKind::Never | TyKind::CVarArgs => {} |
1a4d82fc JJ |
436 | } |
437 | } | |
438 | ||
476ff2be | 439 | pub fn walk_path<'a, V: Visitor<'a>>(visitor: &mut V, path: &'a Path) { |
85aaf69f | 440 | for segment in &path.segments { |
f2b60f7d | 441 | visitor.visit_path_segment(segment); |
1a4d82fc JJ |
442 | } |
443 | } | |
444 | ||
dfeec247 | 445 | pub fn walk_use_tree<'a, V: Visitor<'a>>(visitor: &mut V, use_tree: &'a UseTree, id: NodeId) { |
ff7c6d11 | 446 | visitor.visit_path(&use_tree.prefix, id); |
ff7c6d11 | 447 | match use_tree.kind { |
94b46f34 | 448 | UseTreeKind::Simple(rename, ..) => { |
e1599b0c | 449 | // The extra IDs are handled during HIR lowering. |
0531ce1d | 450 | if let Some(rename) = rename { |
83c7162d | 451 | visitor.visit_ident(rename); |
0531ce1d | 452 | } |
ff7c6d11 | 453 | } |
dfeec247 | 454 | UseTreeKind::Glob => {} |
ff7c6d11 XL |
455 | UseTreeKind::Nested(ref use_trees) => { |
456 | for &(ref nested_tree, nested_id) in use_trees { | |
457 | visitor.visit_use_tree(nested_tree, nested_id, true); | |
458 | } | |
459 | } | |
460 | } | |
b039eaaf SL |
461 | } |
462 | ||
f2b60f7d | 463 | pub fn walk_path_segment<'a, V: Visitor<'a>>(visitor: &mut V, segment: &'a PathSegment) { |
83c7162d | 464 | visitor.visit_ident(segment.ident); |
8faf50e0 | 465 | if let Some(ref args) = segment.args { |
f2b60f7d | 466 | visitor.visit_generic_args(args); |
32a655c1 | 467 | } |
1a4d82fc JJ |
468 | } |
469 | ||
f2b60f7d | 470 | pub fn walk_generic_args<'a, V>(visitor: &mut V, generic_args: &'a GenericArgs) |
dfeec247 XL |
471 | where |
472 | V: Visitor<'a>, | |
3157f602 | 473 | { |
8faf50e0 XL |
474 | match *generic_args { |
475 | GenericArgs::AngleBracketed(ref data) => { | |
ba9703b0 XL |
476 | for arg in &data.args { |
477 | match arg { | |
478 | AngleBracketedArg::Arg(a) => visitor.visit_generic_arg(a), | |
5099ac24 | 479 | AngleBracketedArg::Constraint(c) => visitor.visit_assoc_constraint(c), |
ba9703b0 XL |
480 | } |
481 | } | |
1a4d82fc | 482 | } |
8faf50e0 | 483 | GenericArgs::Parenthesized(ref data) => { |
b039eaaf | 484 | walk_list!(visitor, visit_ty, &data.inputs); |
dfeec247 | 485 | walk_fn_ret_ty(visitor, &data.output); |
1a4d82fc JJ |
486 | } |
487 | } | |
488 | } | |
489 | ||
29967ef6 XL |
490 | pub fn walk_generic_arg<'a, V>(visitor: &mut V, generic_arg: &'a GenericArg) |
491 | where | |
492 | V: Visitor<'a>, | |
493 | { | |
494 | match generic_arg { | |
923072b8 | 495 | GenericArg::Lifetime(lt) => visitor.visit_lifetime(lt, LifetimeCtxt::GenericArg), |
29967ef6 XL |
496 | GenericArg::Type(ty) => visitor.visit_ty(ty), |
497 | GenericArg::Const(ct) => visitor.visit_anon_const(ct), | |
498 | } | |
499 | } | |
500 | ||
5099ac24 | 501 | pub fn walk_assoc_constraint<'a, V: Visitor<'a>>(visitor: &mut V, constraint: &'a AssocConstraint) { |
dc9dc135 | 502 | visitor.visit_ident(constraint.ident); |
fc512014 | 503 | if let Some(ref gen_args) = constraint.gen_args { |
f2b60f7d | 504 | visitor.visit_generic_args(gen_args); |
fc512014 | 505 | } |
dc9dc135 | 506 | match constraint.kind { |
5099ac24 FG |
507 | AssocConstraintKind::Equality { ref term } => match term { |
508 | Term::Ty(ty) => visitor.visit_ty(ty), | |
509 | Term::Const(c) => visitor.visit_anon_const(c), | |
510 | }, | |
511 | AssocConstraintKind::Bound { ref bounds } => { | |
04454e1e | 512 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
dc9dc135 XL |
513 | } |
514 | } | |
1a4d82fc JJ |
515 | } |
516 | ||
476ff2be | 517 | pub fn walk_pat<'a, V: Visitor<'a>>(visitor: &mut V, pattern: &'a Pat) { |
e74abb32 | 518 | match pattern.kind { |
17df50a5 XL |
519 | PatKind::TupleStruct(ref opt_qself, ref path, ref elems) => { |
520 | if let Some(ref qself) = *opt_qself { | |
521 | visitor.visit_ty(&qself.ty); | |
522 | } | |
7453a54e | 523 | visitor.visit_path(path, pattern.id); |
416331ca | 524 | walk_list!(visitor, visit_pat, elems); |
7453a54e | 525 | } |
3157f602 XL |
526 | PatKind::Path(ref opt_qself, ref path) => { |
527 | if let Some(ref qself) = *opt_qself { | |
528 | visitor.visit_ty(&qself.ty); | |
529 | } | |
d9579d0f AL |
530 | visitor.visit_path(path, pattern.id) |
531 | } | |
17df50a5 XL |
532 | PatKind::Struct(ref opt_qself, ref path, ref fields, _) => { |
533 | if let Some(ref qself) = *opt_qself { | |
534 | visitor.visit_ty(&qself.ty); | |
535 | } | |
1a4d82fc | 536 | visitor.visit_path(path, pattern.id); |
6a06907d | 537 | walk_list!(visitor, visit_pat_field, fields); |
1a4d82fc | 538 | } |
dfeec247 XL |
539 | PatKind::Box(ref subpattern) |
540 | | PatKind::Ref(ref subpattern, _) | |
541 | | PatKind::Paren(ref subpattern) => visitor.visit_pat(subpattern), | |
83c7162d XL |
542 | PatKind::Ident(_, ident, ref optional_subpattern) => { |
543 | visitor.visit_ident(ident); | |
b039eaaf | 544 | walk_list!(visitor, visit_pat, optional_subpattern); |
223e47cc | 545 | } |
7453a54e | 546 | PatKind::Lit(ref expression) => visitor.visit_expr(expression), |
32a655c1 | 547 | PatKind::Range(ref lower_bound, ref upper_bound, _) => { |
dfeec247 XL |
548 | walk_list!(visitor, visit_expr, lower_bound); |
549 | walk_list!(visitor, visit_expr, upper_bound); | |
223e47cc | 550 | } |
dfeec247 XL |
551 | PatKind::Wild | PatKind::Rest => {} |
552 | PatKind::Tuple(ref elems) | PatKind::Slice(ref elems) | PatKind::Or(ref elems) => { | |
416331ca | 553 | walk_list!(visitor, visit_pat, elems); |
223e47cc | 554 | } |
29967ef6 | 555 | PatKind::MacCall(ref mac) => visitor.visit_mac_call(mac), |
1a4d82fc JJ |
556 | } |
557 | } | |
558 | ||
74b04a01 XL |
559 | pub fn walk_foreign_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a ForeignItem) { |
560 | let Item { id, span, ident, ref vis, ref attrs, ref kind, tokens: _ } = *item; | |
561 | visitor.visit_vis(vis); | |
562 | visitor.visit_ident(ident); | |
563 | walk_list!(visitor, visit_attribute, attrs); | |
564 | match kind { | |
565 | ForeignItemKind::Static(ty, _, expr) => { | |
566 | visitor.visit_ty(ty); | |
567 | walk_list!(visitor, visit_expr, expr); | |
568 | } | |
3c0e092e | 569 | ForeignItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { |
04454e1e | 570 | let kind = FnKind::Fn(FnCtxt::Foreign, ident, sig, vis, generics, body.as_deref()); |
74b04a01 XL |
571 | visitor.visit_fn(kind, span, id); |
572 | } | |
5e7ed085 | 573 | ForeignItemKind::TyAlias(box TyAlias { generics, bounds, ty, .. }) => { |
74b04a01 | 574 | visitor.visit_generics(generics); |
04454e1e | 575 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
74b04a01 XL |
576 | walk_list!(visitor, visit_ty, ty); |
577 | } | |
ba9703b0 | 578 | ForeignItemKind::MacCall(mac) => { |
29967ef6 | 579 | visitor.visit_mac_call(mac); |
1a4d82fc | 580 | } |
223e47cc | 581 | } |
1a4d82fc JJ |
582 | } |
583 | ||
8faf50e0 | 584 | pub fn walk_param_bound<'a, V: Visitor<'a>>(visitor: &mut V, bound: &'a GenericBound) { |
1a4d82fc | 585 | match *bound { |
f2b60f7d | 586 | GenericBound::Trait(ref typ, ref _modifier) => visitor.visit_poly_trait_ref(typ), |
923072b8 FG |
587 | GenericBound::Outlives(ref lifetime) => { |
588 | visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound) | |
589 | } | |
223e47cc LB |
590 | } |
591 | } | |
592 | ||
ff7c6d11 | 593 | pub fn walk_generic_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a GenericParam) { |
8faf50e0 XL |
594 | visitor.visit_ident(param.ident); |
595 | walk_list!(visitor, visit_attribute, param.attrs.iter()); | |
04454e1e | 596 | walk_list!(visitor, visit_param_bound, ¶m.bounds, BoundKind::Bound); |
8faf50e0 | 597 | match param.kind { |
dc9dc135 | 598 | GenericParamKind::Lifetime => (), |
8faf50e0 | 599 | GenericParamKind::Type { ref default } => walk_list!(visitor, visit_ty, default), |
5869c6ff XL |
600 | GenericParamKind::Const { ref ty, ref default, .. } => { |
601 | visitor.visit_ty(ty); | |
602 | if let Some(default) = default { | |
603 | visitor.visit_anon_const(default); | |
604 | } | |
605 | } | |
1a4d82fc | 606 | } |
ff7c6d11 XL |
607 | } |
608 | ||
609 | pub fn walk_generics<'a, V: Visitor<'a>>(visitor: &mut V, generics: &'a Generics) { | |
610 | walk_list!(visitor, visit_generic_param, &generics.params); | |
8bb4bdeb XL |
611 | walk_list!(visitor, visit_where_predicate, &generics.where_clause.predicates); |
612 | } | |
613 | ||
064997fb FG |
614 | pub fn walk_closure_binder<'a, V: Visitor<'a>>(visitor: &mut V, binder: &'a ClosureBinder) { |
615 | match binder { | |
616 | ClosureBinder::NotPresent => {} | |
617 | ClosureBinder::For { generic_params, span: _ } => { | |
618 | walk_list!(visitor, visit_generic_param, generic_params) | |
619 | } | |
620 | } | |
621 | } | |
622 | ||
8bb4bdeb XL |
623 | pub fn walk_where_predicate<'a, V: Visitor<'a>>(visitor: &mut V, predicate: &'a WherePredicate) { |
624 | match *predicate { | |
dfeec247 XL |
625 | WherePredicate::BoundPredicate(WhereBoundPredicate { |
626 | ref bounded_ty, | |
627 | ref bounds, | |
628 | ref bound_generic_params, | |
629 | .. | |
630 | }) => { | |
8bb4bdeb | 631 | visitor.visit_ty(bounded_ty); |
04454e1e | 632 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
ff7c6d11 | 633 | walk_list!(visitor, visit_generic_param, bound_generic_params); |
8bb4bdeb | 634 | } |
dfeec247 XL |
635 | WherePredicate::RegionPredicate(WhereRegionPredicate { |
636 | ref lifetime, ref bounds, .. | |
637 | }) => { | |
923072b8 | 638 | visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound); |
04454e1e | 639 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
8bb4bdeb | 640 | } |
dfeec247 | 641 | WherePredicate::EqPredicate(WhereEqPredicate { ref lhs_ty, ref rhs_ty, .. }) => { |
8bb4bdeb XL |
642 | visitor.visit_ty(lhs_ty); |
643 | visitor.visit_ty(rhs_ty); | |
223e47cc LB |
644 | } |
645 | } | |
646 | } | |
647 | ||
74b04a01 XL |
648 | pub fn walk_fn_ret_ty<'a, V: Visitor<'a>>(visitor: &mut V, ret_ty: &'a FnRetTy) { |
649 | if let FnRetTy::Ty(ref output_ty) = *ret_ty { | |
b039eaaf | 650 | visitor.visit_ty(output_ty) |
223e47cc LB |
651 | } |
652 | } | |
653 | ||
476ff2be | 654 | pub fn walk_fn_decl<'a, V: Visitor<'a>>(visitor: &mut V, function_declaration: &'a FnDecl) { |
e1599b0c XL |
655 | for param in &function_declaration.inputs { |
656 | visitor.visit_param(param); | |
223e47cc | 657 | } |
416331ca | 658 | visitor.visit_fn_ret_ty(&function_declaration.output); |
223e47cc LB |
659 | } |
660 | ||
f2b60f7d | 661 | pub fn walk_fn<'a, V: Visitor<'a>>(visitor: &mut V, kind: FnKind<'a>) { |
476ff2be | 662 | match kind { |
04454e1e FG |
663 | FnKind::Fn(_, _, sig, _, generics, body) => { |
664 | visitor.visit_generics(generics); | |
532ac7d7 | 665 | visitor.visit_fn_header(&sig.header); |
74b04a01 XL |
666 | walk_fn_decl(visitor, &sig.decl); |
667 | walk_list!(visitor, visit_block, body); | |
476ff2be | 668 | } |
064997fb FG |
669 | FnKind::Closure(binder, decl, body) => { |
670 | visitor.visit_closure_binder(binder); | |
74b04a01 | 671 | walk_fn_decl(visitor, decl); |
476ff2be | 672 | visitor.visit_expr(body); |
1a4d82fc | 673 | } |
1a4d82fc | 674 | } |
b039eaaf | 675 | } |
1a4d82fc | 676 | |
74b04a01 XL |
677 | pub fn walk_assoc_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a AssocItem, ctxt: AssocCtxt) { |
678 | let Item { id, span, ident, ref vis, ref attrs, ref kind, tokens: _ } = *item; | |
679 | visitor.visit_vis(vis); | |
680 | visitor.visit_ident(ident); | |
681 | walk_list!(visitor, visit_attribute, attrs); | |
682 | match kind { | |
683 | AssocItemKind::Const(_, ty, expr) => { | |
d9579d0f | 684 | visitor.visit_ty(ty); |
dfeec247 | 685 | walk_list!(visitor, visit_expr, expr); |
d9579d0f | 686 | } |
3c0e092e | 687 | AssocItemKind::Fn(box Fn { defaultness: _, ref generics, ref sig, ref body }) => { |
04454e1e | 688 | let kind = FnKind::Fn(FnCtxt::Assoc(ctxt), ident, sig, vis, generics, body.as_deref()); |
74b04a01 | 689 | visitor.visit_fn(kind, span, id); |
c34b1796 | 690 | } |
2b03887a | 691 | AssocItemKind::Type(box TyAlias { generics, bounds, ty, .. }) => { |
74b04a01 | 692 | visitor.visit_generics(generics); |
04454e1e | 693 | walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound); |
dfeec247 | 694 | walk_list!(visitor, visit_ty, ty); |
d9579d0f | 695 | } |
ba9703b0 | 696 | AssocItemKind::MacCall(mac) => { |
29967ef6 | 697 | visitor.visit_mac_call(mac); |
1a4d82fc | 698 | } |
223e47cc LB |
699 | } |
700 | } | |
701 | ||
476ff2be | 702 | pub fn walk_struct_def<'a, V: Visitor<'a>>(visitor: &mut V, struct_definition: &'a VariantData) { |
6a06907d | 703 | walk_list!(visitor, visit_field_def, struct_definition.fields()); |
223e47cc LB |
704 | } |
705 | ||
6a06907d XL |
706 | pub fn walk_field_def<'a, V: Visitor<'a>>(visitor: &mut V, field: &'a FieldDef) { |
707 | visitor.visit_vis(&field.vis); | |
708 | if let Some(ident) = field.ident { | |
83c7162d | 709 | visitor.visit_ident(ident); |
2c00a5a8 | 710 | } |
6a06907d XL |
711 | visitor.visit_ty(&field.ty); |
712 | walk_list!(visitor, visit_attribute, &field.attrs); | |
223e47cc LB |
713 | } |
714 | ||
476ff2be | 715 | pub fn walk_block<'a, V: Visitor<'a>>(visitor: &mut V, block: &'a Block) { |
b039eaaf | 716 | walk_list!(visitor, visit_stmt, &block.stmts); |
223e47cc LB |
717 | } |
718 | ||
476ff2be | 719 | pub fn walk_stmt<'a, V: Visitor<'a>>(visitor: &mut V, statement: &'a Stmt) { |
e74abb32 | 720 | match statement.kind { |
3157f602 XL |
721 | StmtKind::Local(ref local) => visitor.visit_local(local), |
722 | StmtKind::Item(ref item) => visitor.visit_item(item), | |
74b04a01 XL |
723 | StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => visitor.visit_expr(expr), |
724 | StmtKind::Empty => {} | |
ba9703b0 | 725 | StmtKind::MacCall(ref mac) => { |
fc512014 | 726 | let MacCallStmt { ref mac, style: _, ref attrs, tokens: _ } = **mac; |
29967ef6 | 727 | visitor.visit_mac_call(mac); |
3157f602 | 728 | for attr in attrs.iter() { |
92a42be0 SL |
729 | visitor.visit_attribute(attr); |
730 | } | |
731 | } | |
223e47cc LB |
732 | } |
733 | } | |
734 | ||
ba9703b0 | 735 | pub fn walk_mac<'a, V: Visitor<'a>>(visitor: &mut V, mac: &'a MacCall) { |
e1599b0c | 736 | visitor.visit_path(&mac.path, DUMMY_NODE_ID); |
223e47cc LB |
737 | } |
738 | ||
94b46f34 XL |
739 | pub fn walk_anon_const<'a, V: Visitor<'a>>(visitor: &mut V, constant: &'a AnonConst) { |
740 | visitor.visit_expr(&constant.value); | |
741 | } | |
742 | ||
04454e1e | 743 | pub fn walk_inline_asm<'a, V: Visitor<'a>>(visitor: &mut V, asm: &'a InlineAsm) { |
17df50a5 XL |
744 | for (op, _) in &asm.operands { |
745 | match op { | |
746 | InlineAsmOperand::In { expr, .. } | |
94222f64 | 747 | | InlineAsmOperand::Out { expr: Some(expr), .. } |
04454e1e | 748 | | InlineAsmOperand::InOut { expr, .. } => visitor.visit_expr(expr), |
94222f64 | 749 | InlineAsmOperand::Out { expr: None, .. } => {} |
17df50a5 XL |
750 | InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => { |
751 | visitor.visit_expr(in_expr); | |
752 | if let Some(out_expr) = out_expr { | |
753 | visitor.visit_expr(out_expr); | |
754 | } | |
755 | } | |
756 | InlineAsmOperand::Const { anon_const, .. } => visitor.visit_anon_const(anon_const), | |
04454e1e | 757 | InlineAsmOperand::Sym { sym } => visitor.visit_inline_asm_sym(sym), |
17df50a5 XL |
758 | } |
759 | } | |
760 | } | |
761 | ||
04454e1e FG |
762 | pub fn walk_inline_asm_sym<'a, V: Visitor<'a>>(visitor: &mut V, sym: &'a InlineAsmSym) { |
763 | if let Some(ref qself) = sym.qself { | |
764 | visitor.visit_ty(&qself.ty); | |
765 | } | |
766 | visitor.visit_path(&sym.path, sym.id); | |
767 | } | |
768 | ||
476ff2be | 769 | pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) { |
e1599b0c XL |
770 | walk_list!(visitor, visit_attribute, expression.attrs.iter()); |
771 | ||
e74abb32 | 772 | match expression.kind { |
dfeec247 | 773 | ExprKind::Box(ref subexpression) => visitor.visit_expr(subexpression), |
32a655c1 | 774 | ExprKind::Array(ref subexpressions) => { |
b039eaaf | 775 | walk_list!(visitor, visit_expr, subexpressions); |
1a4d82fc | 776 | } |
29967ef6 | 777 | ExprKind::ConstBlock(ref anon_const) => visitor.visit_anon_const(anon_const), |
7453a54e | 778 | ExprKind::Repeat(ref element, ref count) => { |
b039eaaf | 779 | visitor.visit_expr(element); |
94b46f34 | 780 | visitor.visit_anon_const(count) |
1a4d82fc | 781 | } |
6a06907d | 782 | ExprKind::Struct(ref se) => { |
17df50a5 XL |
783 | if let Some(ref qself) = se.qself { |
784 | visitor.visit_ty(&qself.ty); | |
785 | } | |
6a06907d XL |
786 | visitor.visit_path(&se.path, expression.id); |
787 | walk_list!(visitor, visit_expr_field, &se.fields); | |
788 | match &se.rest { | |
29967ef6 XL |
789 | StructRest::Base(expr) => visitor.visit_expr(expr), |
790 | StructRest::Rest(_span) => {} | |
791 | StructRest::None => {} | |
792 | } | |
223e47cc | 793 | } |
7453a54e | 794 | ExprKind::Tup(ref subexpressions) => { |
b039eaaf | 795 | walk_list!(visitor, visit_expr, subexpressions); |
223e47cc | 796 | } |
7453a54e | 797 | ExprKind::Call(ref callee_expression, ref arguments) => { |
9e0c209e | 798 | visitor.visit_expr(callee_expression); |
b039eaaf | 799 | walk_list!(visitor, visit_expr, arguments); |
1a4d82fc | 800 | } |
2b03887a | 801 | ExprKind::MethodCall(ref segment, ref receiver, ref arguments, _span) => { |
f2b60f7d | 802 | visitor.visit_path_segment(segment); |
2b03887a | 803 | visitor.visit_expr(receiver); |
9e0c209e | 804 | walk_list!(visitor, visit_expr, arguments); |
223e47cc | 805 | } |
7453a54e | 806 | ExprKind::Binary(_, ref left_expression, ref right_expression) => { |
b039eaaf SL |
807 | visitor.visit_expr(left_expression); |
808 | visitor.visit_expr(right_expression) | |
1a4d82fc | 809 | } |
60c5eb7d | 810 | ExprKind::AddrOf(_, _, ref subexpression) | ExprKind::Unary(_, ref subexpression) => { |
b039eaaf | 811 | visitor.visit_expr(subexpression) |
1a4d82fc | 812 | } |
7453a54e | 813 | ExprKind::Cast(ref subexpression, ref typ) | ExprKind::Type(ref subexpression, ref typ) => { |
b039eaaf SL |
814 | visitor.visit_expr(subexpression); |
815 | visitor.visit_ty(typ) | |
1a4d82fc | 816 | } |
94222f64 | 817 | ExprKind::Let(ref pat, ref expr, _) => { |
e1599b0c | 818 | visitor.visit_pat(pat); |
94222f64 | 819 | visitor.visit_expr(expr); |
dc9dc135 | 820 | } |
7453a54e | 821 | ExprKind::If(ref head_expression, ref if_block, ref optional_else) => { |
b039eaaf SL |
822 | visitor.visit_expr(head_expression); |
823 | visitor.visit_block(if_block); | |
824 | walk_list!(visitor, visit_expr, optional_else); | |
1a4d82fc | 825 | } |
2c00a5a8 XL |
826 | ExprKind::While(ref subexpression, ref block, ref opt_label) => { |
827 | walk_list!(visitor, visit_label, opt_label); | |
b039eaaf SL |
828 | visitor.visit_expr(subexpression); |
829 | visitor.visit_block(block); | |
1a4d82fc | 830 | } |
2c00a5a8 XL |
831 | ExprKind::ForLoop(ref pattern, ref subexpression, ref block, ref opt_label) => { |
832 | walk_list!(visitor, visit_label, opt_label); | |
b039eaaf SL |
833 | visitor.visit_pat(pattern); |
834 | visitor.visit_expr(subexpression); | |
835 | visitor.visit_block(block); | |
b039eaaf | 836 | } |
2c00a5a8 XL |
837 | ExprKind::Loop(ref block, ref opt_label) => { |
838 | walk_list!(visitor, visit_label, opt_label); | |
b039eaaf | 839 | visitor.visit_block(block); |
b039eaaf | 840 | } |
7453a54e | 841 | ExprKind::Match(ref subexpression, ref arms) => { |
b039eaaf SL |
842 | visitor.visit_expr(subexpression); |
843 | walk_list!(visitor, visit_arm, arms); | |
223e47cc | 844 | } |
064997fb FG |
845 | ExprKind::Closure(ref binder, _, _, _, ref decl, ref body, _decl_span) => { |
846 | visitor.visit_fn(FnKind::Closure(binder, decl, body), expression.span, expression.id) | |
74b04a01 | 847 | } |
94b46f34 XL |
848 | ExprKind::Block(ref block, ref opt_label) => { |
849 | walk_list!(visitor, visit_label, opt_label); | |
850 | visitor.visit_block(block); | |
851 | } | |
8faf50e0 XL |
852 | ExprKind::Async(_, _, ref body) => { |
853 | visitor.visit_block(body); | |
854 | } | |
416331ca | 855 | ExprKind::Await(ref expr) => visitor.visit_expr(expr), |
dfeec247 XL |
856 | ExprKind::Assign(ref lhs, ref rhs, _) => { |
857 | visitor.visit_expr(lhs); | |
858 | visitor.visit_expr(rhs); | |
1a4d82fc | 859 | } |
7453a54e | 860 | ExprKind::AssignOp(_, ref left_expression, ref right_expression) => { |
9e0c209e | 861 | visitor.visit_expr(left_expression); |
b039eaaf | 862 | visitor.visit_expr(right_expression); |
223e47cc | 863 | } |
83c7162d | 864 | ExprKind::Field(ref subexpression, ident) => { |
b039eaaf | 865 | visitor.visit_expr(subexpression); |
83c7162d | 866 | visitor.visit_ident(ident); |
223e47cc | 867 | } |
7453a54e | 868 | ExprKind::Index(ref main_expression, ref index_expression) => { |
b039eaaf SL |
869 | visitor.visit_expr(main_expression); |
870 | visitor.visit_expr(index_expression) | |
223e47cc | 871 | } |
54a0048b | 872 | ExprKind::Range(ref start, ref end, _) => { |
b039eaaf SL |
873 | walk_list!(visitor, visit_expr, start); |
874 | walk_list!(visitor, visit_expr, end); | |
223e47cc | 875 | } |
fc512014 | 876 | ExprKind::Underscore => {} |
7453a54e | 877 | ExprKind::Path(ref maybe_qself, ref path) => { |
c34b1796 AL |
878 | if let Some(ref qself) = *maybe_qself { |
879 | visitor.visit_ty(&qself.ty); | |
880 | } | |
1a4d82fc | 881 | visitor.visit_path(path, expression.id) |
223e47cc | 882 | } |
2c00a5a8 XL |
883 | ExprKind::Break(ref opt_label, ref opt_expr) => { |
884 | walk_list!(visitor, visit_label, opt_label); | |
476ff2be SL |
885 | walk_list!(visitor, visit_expr, opt_expr); |
886 | } | |
2c00a5a8 XL |
887 | ExprKind::Continue(ref opt_label) => { |
888 | walk_list!(visitor, visit_label, opt_label); | |
b039eaaf | 889 | } |
7453a54e | 890 | ExprKind::Ret(ref optional_expression) => { |
b039eaaf | 891 | walk_list!(visitor, visit_expr, optional_expression); |
1a4d82fc | 892 | } |
04454e1e FG |
893 | ExprKind::Yeet(ref optional_expression) => { |
894 | walk_list!(visitor, visit_expr, optional_expression); | |
895 | } | |
29967ef6 | 896 | ExprKind::MacCall(ref mac) => visitor.visit_mac_call(mac), |
dfeec247 | 897 | ExprKind::Paren(ref subexpression) => visitor.visit_expr(subexpression), |
923072b8 | 898 | ExprKind::InlineAsm(ref asm) => visitor.visit_inline_asm(asm), |
ea8adc8c XL |
899 | ExprKind::Yield(ref optional_expression) => { |
900 | walk_list!(visitor, visit_expr, optional_expression); | |
901 | } | |
dfeec247 XL |
902 | ExprKind::Try(ref subexpression) => visitor.visit_expr(subexpression), |
903 | ExprKind::TryBlock(ref body) => visitor.visit_block(body), | |
dc9dc135 | 904 | ExprKind::Lit(_) | ExprKind::Err => {} |
1a4d82fc JJ |
905 | } |
906 | ||
907 | visitor.visit_expr_post(expression) | |
908 | } | |
909 | ||
e1599b0c XL |
910 | pub fn walk_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a Param) { |
911 | walk_list!(visitor, visit_attribute, param.attrs.iter()); | |
912 | visitor.visit_pat(¶m.pat); | |
913 | visitor.visit_ty(¶m.ty); | |
416331ca XL |
914 | } |
915 | ||
476ff2be | 916 | pub fn walk_arm<'a, V: Visitor<'a>>(visitor: &mut V, arm: &'a Arm) { |
e1599b0c | 917 | visitor.visit_pat(&arm.pat); |
e1599b0c | 918 | walk_list!(visitor, visit_expr, &arm.guard); |
b039eaaf SL |
919 | visitor.visit_expr(&arm.body); |
920 | walk_list!(visitor, visit_attribute, &arm.attrs); | |
223e47cc | 921 | } |
54a0048b | 922 | |
476ff2be | 923 | pub fn walk_vis<'a, V: Visitor<'a>>(visitor: &mut V, vis: &'a Visibility) { |
f2b60f7d | 924 | if let VisibilityKind::Restricted { ref path, id, shorthand: _ } = vis.kind { |
a7813a04 | 925 | visitor.visit_path(path, id); |
54a0048b SL |
926 | } |
927 | } | |
abe05a73 XL |
928 | |
929 | pub fn walk_attribute<'a, V: Visitor<'a>>(visitor: &mut V, attr: &'a Attribute) { | |
60c5eb7d | 930 | match attr.kind { |
f2b60f7d | 931 | AttrKind::Normal(ref normal) => walk_mac_args(visitor, &normal.item.args), |
3dfed10e | 932 | AttrKind::DocComment(..) => {} |
60c5eb7d XL |
933 | } |
934 | } | |
935 | ||
936 | pub fn walk_mac_args<'a, V: Visitor<'a>>(visitor: &mut V, args: &'a MacArgs) { | |
937 | match args { | |
938 | MacArgs::Empty => {} | |
29967ef6 | 939 | MacArgs::Delimited(_dspan, _delim, _tokens) => {} |
04454e1e FG |
940 | MacArgs::Eq(_eq_span, MacArgsEq::Ast(expr)) => visitor.visit_expr(expr), |
941 | MacArgs::Eq(_, MacArgsEq::Hir(lit)) => { | |
942 | unreachable!("in literal form when walking mac args eq: {:?}", lit) | |
943 | } | |
abe05a73 XL |
944 | } |
945 | } |