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476ff2be SL |
1 | //! HIR walker for walking the contents of nodes. |
2 | //! | |
923072b8 FG |
3 | //! Here are the three available patterns for the visitor strategy, |
4 | //! in roughly the order of desirability: | |
5 | //! | |
6 | //! 1. **Shallow visit**: Get a simple callback for every item (or item-like thing) in the HIR. | |
7 | //! - Example: find all items with a `#[foo]` attribute on them. | |
8 | //! - How: Use the `hir_crate_items` or `hir_module_items` query to traverse over item-like ids | |
9 | //! (ItemId, TraitItemId, etc.) and use tcx.def_kind and `tcx.hir().item*(id)` to filter and | |
10 | //! access actual item-like thing, respectively. | |
11 | //! - Pro: Efficient; just walks the lists of item ids and gives users control whether to access | |
12 | //! the hir_owners themselves or not. | |
13 | //! - Con: Don't get information about nesting | |
14 | //! - Con: Don't have methods for specific bits of HIR, like "on | |
15 | //! every expr, do this". | |
16 | //! 2. **Deep visit**: Want to scan for specific kinds of HIR nodes within | |
17 | //! an item, but don't care about how item-like things are nested | |
18 | //! within one another. | |
19 | //! - Example: Examine each expression to look for its type and do some check or other. | |
20 | //! - How: Implement `intravisit::Visitor` and override the `NestedFilter` type to | |
21 | //! `nested_filter::OnlyBodies` (and implement `nested_visit_map`), and use | |
064997fb | 22 | //! `tcx.hir().visit_all_item_likes_in_crate(&mut visitor)`. Within your |
923072b8 FG |
23 | //! `intravisit::Visitor` impl, implement methods like `visit_expr()` (don't forget to invoke |
24 | //! `intravisit::walk_expr()` to keep walking the subparts). | |
25 | //! - Pro: Visitor methods for any kind of HIR node, not just item-like things. | |
26 | //! - Pro: Integrates well into dependency tracking. | |
27 | //! - Con: Don't get information about nesting between items | |
28 | //! 3. **Nested visit**: Want to visit the whole HIR and you care about the nesting between | |
29 | //! item-like things. | |
30 | //! - Example: Lifetime resolution, which wants to bring lifetimes declared on the | |
31 | //! impl into scope while visiting the impl-items, and then back out again. | |
32 | //! - How: Implement `intravisit::Visitor` and override the `NestedFilter` type to | |
33 | //! `nested_filter::All` (and implement `nested_visit_map`). Walk your crate with | |
34 | //! `tcx.hir().walk_toplevel_module(visitor)` invoked on `tcx.hir().krate()`. | |
35 | //! - Pro: Visitor methods for any kind of HIR node, not just item-like things. | |
36 | //! - Pro: Preserves nesting information | |
37 | //! - Con: Does not integrate well into dependency tracking. | |
476ff2be SL |
38 | //! |
39 | //! If you have decided to use this visitor, here are some general | |
9fa01778 | 40 | //! notes on how to do so: |
476ff2be SL |
41 | //! |
42 | //! Each overridden visit method has full control over what | |
e9174d1e | 43 | //! happens with its node, it can do its own traversal of the node's children, |
9cc50fc6 | 44 | //! call `intravisit::walk_*` to apply the default traversal algorithm, or prevent |
e9174d1e SL |
45 | //! deeper traversal by doing nothing. |
46 | //! | |
92a42be0 SL |
47 | //! When visiting the HIR, the contents of nested items are NOT visited |
48 | //! by default. This is different from the AST visitor, which does a deep walk. | |
49 | //! Hence this module is called `intravisit`; see the method `visit_nested_item` | |
50 | //! for more details. | |
e9174d1e | 51 | //! |
92a42be0 | 52 | //! Note: it is an important invariant that the default visitor walks |
ea8adc8c XL |
53 | //! the body of a function in "execution order" - more concretely, if |
54 | //! we consider the reverse post-order (RPO) of the CFG implied by the HIR, | |
55 | //! then a pre-order traversal of the HIR is consistent with the CFG RPO | |
56 | //! on the *initial CFG point* of each HIR node, while a post-order traversal | |
57 | //! of the HIR is consistent with the CFG RPO on each *final CFG point* of | |
58 | //! each CFG node. | |
59 | //! | |
60 | //! One thing that follows is that if HIR node A always starts/ends executing | |
61 | //! before HIR node B, then A appears in traversal pre/postorder before B, | |
62 | //! respectively. (This follows from RPO respecting CFG domination). | |
63 | //! | |
64 | //! This order consistency is required in a few places in rustc, for | |
65 | //! example generator inference, and possibly also HIR borrowck. | |
e9174d1e | 66 | |
9fa01778 | 67 | use crate::hir::*; |
74b04a01 | 68 | use rustc_ast::walk_list; |
3dfed10e | 69 | use rustc_ast::{Attribute, Label}; |
f9f354fc | 70 | use rustc_span::symbol::{Ident, Symbol}; |
dfeec247 | 71 | use rustc_span::Span; |
dfeec247 | 72 | |
dfeec247 XL |
73 | pub trait IntoVisitor<'hir> { |
74 | type Visitor: Visitor<'hir>; | |
75 | fn into_visitor(&self) -> Self::Visitor; | |
76 | } | |
77 | ||
cdc7bbd5 | 78 | #[derive(Copy, Clone, Debug)] |
e9174d1e | 79 | pub enum FnKind<'a> { |
0731742a | 80 | /// `#[xxx] pub async/const/extern "Abi" fn foo()` |
04454e1e | 81 | ItemFn(Ident, &'a Generics<'a>, FnHeader), |
e9174d1e | 82 | |
0731742a | 83 | /// `fn foo(&self)` |
04454e1e | 84 | Method(Ident, &'a FnSig<'a>), |
e9174d1e | 85 | |
0731742a | 86 | /// `|x, y| {}` |
6a06907d | 87 | Closure, |
54a0048b SL |
88 | } |
89 | ||
90 | impl<'a> FnKind<'a> { | |
48663c56 XL |
91 | pub fn header(&self) -> Option<&FnHeader> { |
92 | match *self { | |
04454e1e FG |
93 | FnKind::ItemFn(_, _, ref header) => Some(header), |
94 | FnKind::Method(_, ref sig) => Some(&sig.header), | |
6a06907d | 95 | FnKind::Closure => None, |
48663c56 XL |
96 | } |
97 | } | |
3c0e092e XL |
98 | |
99 | pub fn constness(self) -> Constness { | |
100 | self.header().map_or(Constness::NotConst, |header| header.constness) | |
101 | } | |
102 | ||
103 | pub fn asyncness(self) -> IsAsync { | |
104 | self.header().map_or(IsAsync::NotAsync, |header| header.asyncness) | |
105 | } | |
e9174d1e SL |
106 | } |
107 | ||
ba9703b0 | 108 | /// An abstract representation of the HIR `rustc_middle::hir::map::Map`. |
dfeec247 | 109 | pub trait Map<'hir> { |
ba9703b0 XL |
110 | /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found. |
111 | fn find(&self, hir_id: HirId) -> Option<Node<'hir>>; | |
dfeec247 | 112 | fn body(&self, id: BodyId) -> &'hir Body<'hir>; |
6a06907d | 113 | fn item(&self, id: ItemId) -> &'hir Item<'hir>; |
dfeec247 XL |
114 | fn trait_item(&self, id: TraitItemId) -> &'hir TraitItem<'hir>; |
115 | fn impl_item(&self, id: ImplItemId) -> &'hir ImplItem<'hir>; | |
fc512014 | 116 | fn foreign_item(&self, id: ForeignItemId) -> &'hir ForeignItem<'hir>; |
dfeec247 XL |
117 | } |
118 | ||
3c0e092e | 119 | // Used when no map is actually available, forcing manual implementation of nested visitors. |
a2a8927a | 120 | impl<'hir> Map<'hir> for ! { |
3c0e092e | 121 | fn find(&self, _: HirId) -> Option<Node<'hir>> { |
5099ac24 | 122 | *self; |
3c0e092e XL |
123 | } |
124 | fn body(&self, _: BodyId) -> &'hir Body<'hir> { | |
5099ac24 | 125 | *self; |
3c0e092e XL |
126 | } |
127 | fn item(&self, _: ItemId) -> &'hir Item<'hir> { | |
5099ac24 | 128 | *self; |
3c0e092e XL |
129 | } |
130 | fn trait_item(&self, _: TraitItemId) -> &'hir TraitItem<'hir> { | |
5099ac24 | 131 | *self; |
3c0e092e XL |
132 | } |
133 | fn impl_item(&self, _: ImplItemId) -> &'hir ImplItem<'hir> { | |
5099ac24 | 134 | *self; |
3c0e092e XL |
135 | } |
136 | fn foreign_item(&self, _: ForeignItemId) -> &'hir ForeignItem<'hir> { | |
5099ac24 | 137 | *self; |
3c0e092e XL |
138 | } |
139 | } | |
140 | ||
5099ac24 FG |
141 | pub mod nested_filter { |
142 | use super::Map; | |
ba9703b0 | 143 | |
04454e1e FG |
144 | /// Specifies what nested things a visitor wants to visit. By "nested |
145 | /// things", we are referring to bits of HIR that are not directly embedded | |
146 | /// within one another but rather indirectly, through a table in the crate. | |
147 | /// This is done to control dependencies during incremental compilation: the | |
148 | /// non-inline bits of HIR can be tracked and hashed separately. | |
149 | /// | |
150 | /// The most common choice is `OnlyBodies`, which will cause the visitor to | |
151 | /// visit fn bodies for fns that it encounters, and closure bodies, but | |
152 | /// skip over nested item-like things. | |
5099ac24 FG |
153 | /// |
154 | /// See the comments on `ItemLikeVisitor` for more details on the overall | |
155 | /// visit strategy. | |
156 | pub trait NestedFilter<'hir> { | |
157 | type Map: Map<'hir>; | |
158 | ||
159 | /// Whether the visitor visits nested "item-like" things. | |
160 | /// E.g., item, impl-item. | |
161 | const INTER: bool; | |
162 | /// Whether the visitor visits "intra item-like" things. | |
163 | /// E.g., function body, closure, `AnonConst` | |
164 | const INTRA: bool; | |
fc512014 | 165 | } |
ba9703b0 | 166 | |
476ff2be SL |
167 | /// Do not visit any nested things. When you add a new |
168 | /// "non-nested" thing, you will want to audit such uses to see if | |
169 | /// they remain valid. | |
170 | /// | |
171 | /// Use this if you are only walking some particular kind of tree | |
172 | /// (i.e., a type, or fn signature) and you don't want to thread a | |
173 | /// HIR map around. | |
5099ac24 FG |
174 | pub struct None(()); |
175 | impl NestedFilter<'_> for None { | |
176 | type Map = !; | |
177 | const INTER: bool = false; | |
178 | const INTRA: bool = false; | |
476ff2be SL |
179 | } |
180 | } | |
181 | ||
5099ac24 FG |
182 | use nested_filter::NestedFilter; |
183 | ||
e9174d1e | 184 | /// Each method of the Visitor trait is a hook to be potentially |
9fa01778 | 185 | /// overridden. Each method's default implementation recursively visits |
e9174d1e | 186 | /// the substructure of the input via the corresponding `walk` method; |
0731742a | 187 | /// e.g., the `visit_mod` method by default calls `intravisit::walk_mod`. |
e9174d1e | 188 | /// |
92a42be0 SL |
189 | /// Note that this visitor does NOT visit nested items by default |
190 | /// (this is why the module is called `intravisit`, to distinguish it | |
191 | /// from the AST's `visit` module, which acts differently). If you | |
192 | /// simply want to visit all items in the crate in some order, you | |
064997fb | 193 | /// should call `tcx.hir().visit_all_item_likes_in_crate`. Otherwise, see the comment |
92a42be0 SL |
194 | /// on `visit_nested_item` for details on how to visit nested items. |
195 | /// | |
e9174d1e | 196 | /// If you want to ensure that your code handles every variant |
9fa01778 | 197 | /// explicitly, you need to override each method. (And you also need |
e9174d1e SL |
198 | /// to monitor future changes to `Visitor` in case a new method with a |
199 | /// new default implementation gets introduced.) | |
e1599b0c | 200 | pub trait Visitor<'v>: Sized { |
5099ac24 FG |
201 | // this type should not be overridden, it exists for convenient usage as `Self::Map` |
202 | type Map: Map<'v> = <Self::NestedFilter as NestedFilter<'v>>::Map; | |
dfeec247 | 203 | |
92a42be0 SL |
204 | /////////////////////////////////////////////////////////////////////////// |
205 | // Nested items. | |
206 | ||
04454e1e FG |
207 | /// Override this type to control which nested HIR are visited; see |
208 | /// [`NestedFilter`] for details. If you override this type, you | |
209 | /// must also override [`nested_visit_map`](Self::nested_visit_map). | |
476ff2be SL |
210 | /// |
211 | /// **If for some reason you want the nested behavior, but don't | |
04454e1e FG |
212 | /// have a `Map` at your disposal:** then override the |
213 | /// `visit_nested_XXX` methods. If a new `visit_nested_XXX` variant is | |
214 | /// added in the future, it will cause a panic which can be detected | |
215 | /// and fixed appropriately. | |
216 | type NestedFilter: NestedFilter<'v> = nested_filter::None; | |
217 | ||
218 | /// If `type NestedFilter` is set to visit nested items, this method | |
219 | /// must also be overridden to provide a map to retrieve nested items. | |
5099ac24 FG |
220 | fn nested_visit_map(&mut self) -> Self::Map { |
221 | panic!( | |
222 | "nested_visit_map must be implemented or consider using \ | |
223 | `type NestedFilter = nested_filter::None` (the default)" | |
224 | ); | |
225 | } | |
476ff2be | 226 | |
04454e1e FG |
227 | /// Invoked when a nested item is encountered. By default, when |
228 | /// `Self::NestedFilter` is `nested_filter::None`, this method does | |
229 | /// nothing. **You probably don't want to override this method** -- | |
230 | /// instead, override [`Self::NestedFilter`] or use the "shallow" or | |
231 | /// "deep" visit patterns described on | |
232 | /// `itemlikevisit::ItemLikeVisitor`. The only reason to override | |
233 | /// this method is if you want a nested pattern but cannot supply a | |
234 | /// [`Map`]; see `nested_visit_map` for advice. | |
92a42be0 | 235 | fn visit_nested_item(&mut self, id: ItemId) { |
5099ac24 FG |
236 | if Self::NestedFilter::INTER { |
237 | let item = self.nested_visit_map().item(id); | |
238 | self.visit_item(item); | |
239 | } | |
476ff2be SL |
240 | } |
241 | ||
32a655c1 SL |
242 | /// Like `visit_nested_item()`, but for trait items. See |
243 | /// `visit_nested_item()` for advice on when to override this | |
244 | /// method. | |
32a655c1 | 245 | fn visit_nested_trait_item(&mut self, id: TraitItemId) { |
5099ac24 FG |
246 | if Self::NestedFilter::INTER { |
247 | let item = self.nested_visit_map().trait_item(id); | |
248 | self.visit_trait_item(item); | |
249 | } | |
32a655c1 SL |
250 | } |
251 | ||
476ff2be SL |
252 | /// Like `visit_nested_item()`, but for impl items. See |
253 | /// `visit_nested_item()` for advice on when to override this | |
254 | /// method. | |
476ff2be | 255 | fn visit_nested_impl_item(&mut self, id: ImplItemId) { |
5099ac24 FG |
256 | if Self::NestedFilter::INTER { |
257 | let item = self.nested_visit_map().impl_item(id); | |
258 | self.visit_impl_item(item); | |
259 | } | |
92a42be0 SL |
260 | } |
261 | ||
fc512014 XL |
262 | /// Like `visit_nested_item()`, but for foreign items. See |
263 | /// `visit_nested_item()` for advice on when to override this | |
264 | /// method. | |
265 | fn visit_nested_foreign_item(&mut self, id: ForeignItemId) { | |
5099ac24 FG |
266 | if Self::NestedFilter::INTER { |
267 | let item = self.nested_visit_map().foreign_item(id); | |
268 | self.visit_foreign_item(item); | |
269 | } | |
fc512014 XL |
270 | } |
271 | ||
476ff2be | 272 | /// Invoked to visit the body of a function, method or closure. Like |
04454e1e FG |
273 | /// `visit_nested_item`, does nothing by default unless you override |
274 | /// `Self::NestedFilter`. | |
32a655c1 | 275 | fn visit_nested_body(&mut self, id: BodyId) { |
5099ac24 FG |
276 | if Self::NestedFilter::INTRA { |
277 | let body = self.nested_visit_map().body(id); | |
278 | self.visit_body(body); | |
279 | } | |
476ff2be SL |
280 | } |
281 | ||
dfeec247 | 282 | fn visit_param(&mut self, param: &'v Param<'v>) { |
e1599b0c | 283 | walk_param(self, param) |
416331ca XL |
284 | } |
285 | ||
9fa01778 | 286 | /// Visits the top-level item and (optionally) nested items / impl items. See |
92a42be0 | 287 | /// `visit_nested_item` for details. |
dfeec247 | 288 | fn visit_item(&mut self, i: &'v Item<'v>) { |
92a42be0 SL |
289 | walk_item(self, i) |
290 | } | |
291 | ||
dfeec247 | 292 | fn visit_body(&mut self, b: &'v Body<'v>) { |
32a655c1 SL |
293 | walk_body(self, b); |
294 | } | |
295 | ||
92a42be0 SL |
296 | /////////////////////////////////////////////////////////////////////////// |
297 | ||
9fa01778 | 298 | fn visit_id(&mut self, _hir_id: HirId) { |
5bcae85e SL |
299 | // Nothing to do. |
300 | } | |
f9f354fc | 301 | fn visit_name(&mut self, _span: Span, _name: Symbol) { |
e9174d1e SL |
302 | // Nothing to do. |
303 | } | |
94b46f34 XL |
304 | fn visit_ident(&mut self, ident: Ident) { |
305 | walk_ident(self, ident) | |
306 | } | |
dfeec247 | 307 | fn visit_mod(&mut self, m: &'v Mod<'v>, _s: Span, n: HirId) { |
5bcae85e | 308 | walk_mod(self, m, n) |
b039eaaf | 309 | } |
dfeec247 | 310 | fn visit_foreign_item(&mut self, i: &'v ForeignItem<'v>) { |
b039eaaf SL |
311 | walk_foreign_item(self, i) |
312 | } | |
dfeec247 | 313 | fn visit_local(&mut self, l: &'v Local<'v>) { |
b039eaaf SL |
314 | walk_local(self, l) |
315 | } | |
dfeec247 | 316 | fn visit_block(&mut self, b: &'v Block<'v>) { |
b039eaaf SL |
317 | walk_block(self, b) |
318 | } | |
dfeec247 | 319 | fn visit_stmt(&mut self, s: &'v Stmt<'v>) { |
b039eaaf SL |
320 | walk_stmt(self, s) |
321 | } | |
dfeec247 | 322 | fn visit_arm(&mut self, a: &'v Arm<'v>) { |
b039eaaf SL |
323 | walk_arm(self, a) |
324 | } | |
dfeec247 | 325 | fn visit_pat(&mut self, p: &'v Pat<'v>) { |
b039eaaf SL |
326 | walk_pat(self, p) |
327 | } | |
a2a8927a XL |
328 | fn visit_array_length(&mut self, len: &'v ArrayLen) { |
329 | walk_array_len(self, len) | |
330 | } | |
94b46f34 XL |
331 | fn visit_anon_const(&mut self, c: &'v AnonConst) { |
332 | walk_anon_const(self, c) | |
333 | } | |
dfeec247 | 334 | fn visit_expr(&mut self, ex: &'v Expr<'v>) { |
b039eaaf SL |
335 | walk_expr(self, ex) |
336 | } | |
a2a8927a XL |
337 | fn visit_let_expr(&mut self, lex: &'v Let<'v>) { |
338 | walk_let_expr(self, lex) | |
339 | } | |
dfeec247 | 340 | fn visit_ty(&mut self, t: &'v Ty<'v>) { |
b039eaaf SL |
341 | walk_ty(self, t) |
342 | } | |
dfeec247 | 343 | fn visit_generic_param(&mut self, p: &'v GenericParam<'v>) { |
ff7c6d11 XL |
344 | walk_generic_param(self, p) |
345 | } | |
cdc7bbd5 XL |
346 | fn visit_const_param_default(&mut self, _param: HirId, ct: &'v AnonConst) { |
347 | walk_const_param_default(self, ct) | |
348 | } | |
dfeec247 | 349 | fn visit_generics(&mut self, g: &'v Generics<'v>) { |
b039eaaf SL |
350 | walk_generics(self, g) |
351 | } | |
dfeec247 | 352 | fn visit_where_predicate(&mut self, predicate: &'v WherePredicate<'v>) { |
3157f602 XL |
353 | walk_where_predicate(self, predicate) |
354 | } | |
dfeec247 | 355 | fn visit_fn_decl(&mut self, fd: &'v FnDecl<'v>) { |
32a655c1 SL |
356 | walk_fn_decl(self, fd) |
357 | } | |
dfeec247 | 358 | fn visit_fn(&mut self, fk: FnKind<'v>, fd: &'v FnDecl<'v>, b: BodyId, s: Span, id: HirId) { |
5bcae85e | 359 | walk_fn(self, fk, fd, b, s, id) |
e9174d1e | 360 | } |
dfeec247 | 361 | fn visit_use(&mut self, path: &'v Path<'v>, hir_id: HirId) { |
9fa01778 | 362 | walk_use(self, path, hir_id) |
13cf67c4 | 363 | } |
dfeec247 | 364 | fn visit_trait_item(&mut self, ti: &'v TraitItem<'v>) { |
b039eaaf SL |
365 | walk_trait_item(self, ti) |
366 | } | |
32a655c1 SL |
367 | fn visit_trait_item_ref(&mut self, ii: &'v TraitItemRef) { |
368 | walk_trait_item_ref(self, ii) | |
369 | } | |
dfeec247 | 370 | fn visit_impl_item(&mut self, ii: &'v ImplItem<'v>) { |
b039eaaf SL |
371 | walk_impl_item(self, ii) |
372 | } | |
c295e0f8 | 373 | fn visit_foreign_item_ref(&mut self, ii: &'v ForeignItemRef) { |
fc512014 XL |
374 | walk_foreign_item_ref(self, ii) |
375 | } | |
c295e0f8 | 376 | fn visit_impl_item_ref(&mut self, ii: &'v ImplItemRef) { |
476ff2be SL |
377 | walk_impl_item_ref(self, ii) |
378 | } | |
dfeec247 | 379 | fn visit_trait_ref(&mut self, t: &'v TraitRef<'v>) { |
b039eaaf SL |
380 | walk_trait_ref(self, t) |
381 | } | |
dfeec247 | 382 | fn visit_param_bound(&mut self, bounds: &'v GenericBound<'v>) { |
8faf50e0 | 383 | walk_param_bound(self, bounds) |
e9174d1e | 384 | } |
dfeec247 | 385 | fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef<'v>, m: TraitBoundModifier) { |
e9174d1e SL |
386 | walk_poly_trait_ref(self, t, m) |
387 | } | |
dfeec247 XL |
388 | fn visit_variant_data( |
389 | &mut self, | |
390 | s: &'v VariantData<'v>, | |
f9f354fc | 391 | _: Symbol, |
dfeec247 XL |
392 | _: &'v Generics<'v>, |
393 | _parent_id: HirId, | |
394 | _: Span, | |
395 | ) { | |
e9174d1e SL |
396 | walk_struct_def(self, s) |
397 | } | |
6a06907d XL |
398 | fn visit_field_def(&mut self, s: &'v FieldDef<'v>) { |
399 | walk_field_def(self, s) | |
e9174d1e | 400 | } |
dfeec247 XL |
401 | fn visit_enum_def( |
402 | &mut self, | |
403 | enum_definition: &'v EnumDef<'v>, | |
404 | generics: &'v Generics<'v>, | |
405 | item_id: HirId, | |
406 | _: Span, | |
407 | ) { | |
b039eaaf | 408 | walk_enum_def(self, enum_definition, generics, item_id) |
e9174d1e | 409 | } |
dfeec247 | 410 | fn visit_variant(&mut self, v: &'v Variant<'v>, g: &'v Generics<'v>, item_id: HirId) { |
b039eaaf | 411 | walk_variant(self, v, g, item_id) |
e9174d1e | 412 | } |
2c00a5a8 XL |
413 | fn visit_label(&mut self, label: &'v Label) { |
414 | walk_label(self, label) | |
415 | } | |
94222f64 XL |
416 | fn visit_infer(&mut self, inf: &'v InferArg) { |
417 | walk_inf(self, inf); | |
418 | } | |
dfeec247 | 419 | fn visit_generic_arg(&mut self, generic_arg: &'v GenericArg<'v>) { |
8faf50e0 XL |
420 | match generic_arg { |
421 | GenericArg::Lifetime(lt) => self.visit_lifetime(lt), | |
422 | GenericArg::Type(ty) => self.visit_ty(ty), | |
9fa01778 | 423 | GenericArg::Const(ct) => self.visit_anon_const(&ct.value), |
94222f64 | 424 | GenericArg::Infer(inf) => self.visit_infer(inf), |
8faf50e0 XL |
425 | } |
426 | } | |
b039eaaf SL |
427 | fn visit_lifetime(&mut self, lifetime: &'v Lifetime) { |
428 | walk_lifetime(self, lifetime) | |
e9174d1e | 429 | } |
dfeec247 | 430 | fn visit_qpath(&mut self, qpath: &'v QPath<'v>, id: HirId, span: Span) { |
476ff2be SL |
431 | walk_qpath(self, qpath, id, span) |
432 | } | |
dfeec247 | 433 | fn visit_path(&mut self, path: &'v Path<'v>, _id: HirId) { |
e9174d1e SL |
434 | walk_path(self, path) |
435 | } | |
dfeec247 | 436 | fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v PathSegment<'v>) { |
e9174d1e SL |
437 | walk_path_segment(self, path_span, path_segment) |
438 | } | |
dfeec247 | 439 | fn visit_generic_args(&mut self, path_span: Span, generic_args: &'v GenericArgs<'v>) { |
8faf50e0 | 440 | walk_generic_args(self, path_span, generic_args) |
e9174d1e | 441 | } |
dfeec247 | 442 | fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding<'v>) { |
e9174d1e SL |
443 | walk_assoc_type_binding(self, type_binding) |
444 | } | |
923072b8 | 445 | fn visit_attribute(&mut self, _attr: &'v Attribute) {} |
dc9dc135 | 446 | fn visit_associated_item_kind(&mut self, kind: &'v AssocItemKind) { |
476ff2be SL |
447 | walk_associated_item_kind(self, kind); |
448 | } | |
449 | fn visit_defaultness(&mut self, defaultness: &'v Defaultness) { | |
450 | walk_defaultness(self, defaultness); | |
451 | } | |
04454e1e FG |
452 | fn visit_inline_asm(&mut self, asm: &'v InlineAsm<'v>, id: HirId) { |
453 | walk_inline_asm(self, asm, id); | |
454 | } | |
e9174d1e SL |
455 | } |
456 | ||
dfeec247 | 457 | pub fn walk_mod<'v, V: Visitor<'v>>(visitor: &mut V, module: &'v Mod<'v>, mod_hir_id: HirId) { |
9fa01778 | 458 | visitor.visit_id(mod_hir_id); |
dfeec247 | 459 | for &item_id in module.item_ids { |
92a42be0 SL |
460 | visitor.visit_nested_item(item_id); |
461 | } | |
e9174d1e SL |
462 | } |
463 | ||
dfeec247 XL |
464 | pub fn walk_body<'v, V: Visitor<'v>>(visitor: &mut V, body: &'v Body<'v>) { |
465 | walk_list!(visitor, visit_param, body.params); | |
32a655c1 SL |
466 | visitor.visit_expr(&body.value); |
467 | } | |
468 | ||
dfeec247 | 469 | pub fn walk_local<'v, V: Visitor<'v>>(visitor: &mut V, local: &'v Local<'v>) { |
ea8adc8c XL |
470 | // Intentionally visiting the expr first - the initialization expr |
471 | // dominates the local's definition. | |
472 | walk_list!(visitor, visit_expr, &local.init); | |
9fa01778 | 473 | visitor.visit_id(local.hir_id); |
b039eaaf | 474 | visitor.visit_pat(&local.pat); |
064997fb FG |
475 | if let Some(els) = local.els { |
476 | visitor.visit_block(els); | |
477 | } | |
b039eaaf | 478 | walk_list!(visitor, visit_ty, &local.ty); |
b039eaaf SL |
479 | } |
480 | ||
94b46f34 XL |
481 | pub fn walk_ident<'v, V: Visitor<'v>>(visitor: &mut V, ident: Ident) { |
482 | visitor.visit_name(ident.span, ident.name); | |
483 | } | |
484 | ||
2c00a5a8 | 485 | pub fn walk_label<'v, V: Visitor<'v>>(visitor: &mut V, label: &'v Label) { |
8faf50e0 | 486 | visitor.visit_ident(label.ident); |
2c00a5a8 XL |
487 | } |
488 | ||
b039eaaf | 489 | pub fn walk_lifetime<'v, V: Visitor<'v>>(visitor: &mut V, lifetime: &'v Lifetime) { |
9fa01778 | 490 | visitor.visit_id(lifetime.hir_id); |
ea8adc8c | 491 | match lifetime.name { |
923072b8 | 492 | LifetimeName::Param(_, ParamName::Plain(ident)) => { |
8faf50e0 | 493 | visitor.visit_ident(ident); |
ea8adc8c | 494 | } |
923072b8 FG |
495 | LifetimeName::Param(_, ParamName::Fresh) |
496 | | LifetimeName::Param(_, ParamName::Error) | |
dfeec247 XL |
497 | | LifetimeName::Static |
498 | | LifetimeName::Error | |
dfeec247 | 499 | | LifetimeName::ImplicitObjectLifetimeDefault |
064997fb | 500 | | LifetimeName::Infer => {} |
ea8adc8c | 501 | } |
e9174d1e SL |
502 | } |
503 | ||
dfeec247 XL |
504 | pub fn walk_poly_trait_ref<'v, V: Visitor<'v>>( |
505 | visitor: &mut V, | |
506 | trait_ref: &'v PolyTraitRef<'v>, | |
507 | _modifier: TraitBoundModifier, | |
508 | ) { | |
509 | walk_list!(visitor, visit_generic_param, trait_ref.bound_generic_params); | |
e9174d1e SL |
510 | visitor.visit_trait_ref(&trait_ref.trait_ref); |
511 | } | |
512 | ||
dfeec247 | 513 | pub fn walk_trait_ref<'v, V: Visitor<'v>>(visitor: &mut V, trait_ref: &'v TraitRef<'v>) { |
9fa01778 | 514 | visitor.visit_id(trait_ref.hir_ref_id); |
b7449926 | 515 | visitor.visit_path(&trait_ref.path, trait_ref.hir_ref_id) |
e9174d1e SL |
516 | } |
517 | ||
dfeec247 | 518 | pub fn walk_param<'v, V: Visitor<'v>>(visitor: &mut V, param: &'v Param<'v>) { |
e1599b0c XL |
519 | visitor.visit_id(param.hir_id); |
520 | visitor.visit_pat(¶m.pat); | |
416331ca XL |
521 | } |
522 | ||
dfeec247 | 523 | pub fn walk_item<'v, V: Visitor<'v>>(visitor: &mut V, item: &'v Item<'v>) { |
0731742a | 524 | visitor.visit_ident(item.ident); |
e74abb32 | 525 | match item.kind { |
8faf50e0 | 526 | ItemKind::ExternCrate(orig_name) => { |
6a06907d | 527 | visitor.visit_id(item.hir_id()); |
0531ce1d XL |
528 | if let Some(orig_name) = orig_name { |
529 | visitor.visit_name(item.span, orig_name); | |
2c00a5a8 | 530 | } |
b039eaaf | 531 | } |
8faf50e0 | 532 | ItemKind::Use(ref path, _) => { |
6a06907d | 533 | visitor.visit_use(path, item.hir_id()); |
e9174d1e | 534 | } |
dfeec247 | 535 | ItemKind::Static(ref typ, _, body) | ItemKind::Const(ref typ, body) => { |
6a06907d | 536 | visitor.visit_id(item.hir_id()); |
b039eaaf | 537 | visitor.visit_ty(typ); |
32a655c1 | 538 | visitor.visit_nested_body(body); |
e9174d1e | 539 | } |
dfeec247 | 540 | ItemKind::Fn(ref sig, ref generics, body_id) => visitor.visit_fn( |
04454e1e | 541 | FnKind::ItemFn(item.ident, generics, sig.header), |
dfeec247 XL |
542 | &sig.decl, |
543 | body_id, | |
544 | item.span, | |
6a06907d | 545 | item.hir_id(), |
dfeec247 | 546 | ), |
5e7ed085 | 547 | ItemKind::Macro(..) => { |
94222f64 XL |
548 | visitor.visit_id(item.hir_id()); |
549 | } | |
8faf50e0 | 550 | ItemKind::Mod(ref module) => { |
9fa01778 | 551 | // `visit_mod()` takes care of visiting the `Item`'s `HirId`. |
6a06907d | 552 | visitor.visit_mod(module, item.span, item.hir_id()) |
e9174d1e | 553 | } |
fc512014 | 554 | ItemKind::ForeignMod { abi: _, items } => { |
6a06907d | 555 | visitor.visit_id(item.hir_id()); |
fc512014 | 556 | walk_list!(visitor, visit_foreign_item_ref, items); |
e9174d1e | 557 | } |
17df50a5 | 558 | ItemKind::GlobalAsm(asm) => { |
6a06907d | 559 | visitor.visit_id(item.hir_id()); |
04454e1e | 560 | visitor.visit_inline_asm(asm, item.hir_id()); |
cc61c64b | 561 | } |
416331ca | 562 | ItemKind::TyAlias(ref ty, ref generics) => { |
6a06907d | 563 | visitor.visit_id(item.hir_id()); |
532ac7d7 XL |
564 | visitor.visit_ty(ty); |
565 | visitor.visit_generics(generics) | |
e9174d1e | 566 | } |
dfeec247 | 567 | ItemKind::OpaqueTy(OpaqueTy { ref generics, bounds, .. }) => { |
6a06907d | 568 | visitor.visit_id(item.hir_id()); |
94b46f34 | 569 | walk_generics(visitor, generics); |
8faf50e0 | 570 | walk_list!(visitor, visit_param_bound, bounds); |
94b46f34 | 571 | } |
532ac7d7 XL |
572 | ItemKind::Enum(ref enum_definition, ref generics) => { |
573 | visitor.visit_generics(generics); | |
9fa01778 | 574 | // `visit_enum_def()` takes care of visiting the `Item`'s `HirId`. |
6a06907d | 575 | visitor.visit_enum_def(enum_definition, generics, item.hir_id(), item.span) |
e9174d1e | 576 | } |
5869c6ff | 577 | ItemKind::Impl(Impl { |
dfeec247 XL |
578 | unsafety: _, |
579 | defaultness: _, | |
580 | polarity: _, | |
581 | constness: _, | |
ba9703b0 | 582 | defaultness_span: _, |
532ac7d7 | 583 | ref generics, |
dfeec247 XL |
584 | ref of_trait, |
585 | ref self_ty, | |
586 | items, | |
5869c6ff | 587 | }) => { |
6a06907d | 588 | visitor.visit_id(item.hir_id()); |
532ac7d7 | 589 | visitor.visit_generics(generics); |
dfeec247 XL |
590 | walk_list!(visitor, visit_trait_ref, of_trait); |
591 | visitor.visit_ty(self_ty); | |
04454e1e | 592 | walk_list!(visitor, visit_impl_item_ref, *items); |
e9174d1e | 593 | } |
dfeec247 XL |
594 | ItemKind::Struct(ref struct_definition, ref generics) |
595 | | ItemKind::Union(ref struct_definition, ref generics) => { | |
e9174d1e | 596 | visitor.visit_generics(generics); |
6a06907d | 597 | visitor.visit_id(item.hir_id()); |
dfeec247 XL |
598 | visitor.visit_variant_data( |
599 | struct_definition, | |
600 | item.ident.name, | |
601 | generics, | |
6a06907d | 602 | item.hir_id(), |
dfeec247 XL |
603 | item.span, |
604 | ); | |
605 | } | |
606 | ItemKind::Trait(.., ref generics, bounds, trait_item_refs) => { | |
6a06907d | 607 | visitor.visit_id(item.hir_id()); |
e9174d1e | 608 | visitor.visit_generics(generics); |
8faf50e0 | 609 | walk_list!(visitor, visit_param_bound, bounds); |
32a655c1 | 610 | walk_list!(visitor, visit_trait_item_ref, trait_item_refs); |
e9174d1e | 611 | } |
dfeec247 | 612 | ItemKind::TraitAlias(ref generics, bounds) => { |
6a06907d | 613 | visitor.visit_id(item.hir_id()); |
ff7c6d11 | 614 | visitor.visit_generics(generics); |
8faf50e0 | 615 | walk_list!(visitor, visit_param_bound, bounds); |
ff7c6d11 | 616 | } |
e9174d1e | 617 | } |
e9174d1e SL |
618 | } |
619 | ||
04454e1e FG |
620 | pub fn walk_inline_asm<'v, V: Visitor<'v>>(visitor: &mut V, asm: &'v InlineAsm<'v>, id: HirId) { |
621 | for (op, op_sp) in asm.operands { | |
17df50a5 | 622 | match op { |
04454e1e FG |
623 | InlineAsmOperand::In { expr, .. } | InlineAsmOperand::InOut { expr, .. } => { |
624 | visitor.visit_expr(expr) | |
625 | } | |
17df50a5 XL |
626 | InlineAsmOperand::Out { expr, .. } => { |
627 | if let Some(expr) = expr { | |
628 | visitor.visit_expr(expr); | |
629 | } | |
630 | } | |
631 | InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => { | |
632 | visitor.visit_expr(in_expr); | |
633 | if let Some(out_expr) = out_expr { | |
634 | visitor.visit_expr(out_expr); | |
635 | } | |
636 | } | |
04454e1e FG |
637 | InlineAsmOperand::Const { anon_const, .. } |
638 | | InlineAsmOperand::SymFn { anon_const, .. } => visitor.visit_anon_const(anon_const), | |
639 | InlineAsmOperand::SymStatic { path, .. } => visitor.visit_qpath(path, id, *op_sp), | |
17df50a5 XL |
640 | } |
641 | } | |
642 | } | |
643 | ||
dfeec247 | 644 | pub fn walk_use<'v, V: Visitor<'v>>(visitor: &mut V, path: &'v Path<'v>, hir_id: HirId) { |
9fa01778 | 645 | visitor.visit_id(hir_id); |
13cf67c4 XL |
646 | visitor.visit_path(path, hir_id); |
647 | } | |
648 | ||
dfeec247 XL |
649 | pub fn walk_enum_def<'v, V: Visitor<'v>>( |
650 | visitor: &mut V, | |
651 | enum_definition: &'v EnumDef<'v>, | |
652 | generics: &'v Generics<'v>, | |
653 | item_id: HirId, | |
654 | ) { | |
5bcae85e | 655 | visitor.visit_id(item_id); |
dfeec247 | 656 | walk_list!(visitor, visit_variant, enum_definition.variants, generics, item_id); |
e9174d1e SL |
657 | } |
658 | ||
dfeec247 XL |
659 | pub fn walk_variant<'v, V: Visitor<'v>>( |
660 | visitor: &mut V, | |
661 | variant: &'v Variant<'v>, | |
662 | generics: &'v Generics<'v>, | |
663 | parent_item_id: HirId, | |
664 | ) { | |
e1599b0c XL |
665 | visitor.visit_ident(variant.ident); |
666 | visitor.visit_id(variant.id); | |
dfeec247 XL |
667 | visitor.visit_variant_data( |
668 | &variant.data, | |
669 | variant.ident.name, | |
670 | generics, | |
671 | parent_item_id, | |
672 | variant.span, | |
673 | ); | |
e1599b0c | 674 | walk_list!(visitor, visit_anon_const, &variant.disr_expr); |
e9174d1e SL |
675 | } |
676 | ||
dfeec247 | 677 | pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty<'v>) { |
9fa01778 | 678 | visitor.visit_id(typ.hir_id); |
5bcae85e | 679 | |
e74abb32 | 680 | match typ.kind { |
dfeec247 XL |
681 | TyKind::Slice(ref ty) => visitor.visit_ty(ty), |
682 | TyKind::Ptr(ref mutable_type) => visitor.visit_ty(&mutable_type.ty), | |
8faf50e0 | 683 | TyKind::Rptr(ref lifetime, ref mutable_type) => { |
32a655c1 | 684 | visitor.visit_lifetime(lifetime); |
b039eaaf | 685 | visitor.visit_ty(&mutable_type.ty) |
e9174d1e | 686 | } |
e1599b0c | 687 | TyKind::Never => {} |
dfeec247 | 688 | TyKind::Tup(tuple_element_types) => { |
b039eaaf | 689 | walk_list!(visitor, visit_ty, tuple_element_types); |
e9174d1e | 690 | } |
8faf50e0 | 691 | TyKind::BareFn(ref function_declaration) => { |
dfeec247 | 692 | walk_list!(visitor, visit_generic_param, function_declaration.generic_params); |
94b46f34 | 693 | visitor.visit_fn_decl(&function_declaration.decl); |
e9174d1e | 694 | } |
8faf50e0 | 695 | TyKind::Path(ref qpath) => { |
b7449926 | 696 | visitor.visit_qpath(qpath, typ.hir_id, typ.span); |
e9174d1e | 697 | } |
f035d41b | 698 | TyKind::OpaqueDef(item_id, lifetimes) => { |
0bf4aa26 XL |
699 | visitor.visit_nested_item(item_id); |
700 | walk_list!(visitor, visit_generic_arg, lifetimes); | |
701 | } | |
8faf50e0 | 702 | TyKind::Array(ref ty, ref length) => { |
b039eaaf | 703 | visitor.visit_ty(ty); |
a2a8927a | 704 | visitor.visit_array_length(length) |
e9174d1e | 705 | } |
6a06907d | 706 | TyKind::TraitObject(bounds, ref lifetime, _syntax) => { |
32a655c1 SL |
707 | for bound in bounds { |
708 | visitor.visit_poly_trait_ref(bound, TraitBoundModifier::None); | |
709 | } | |
710 | visitor.visit_lifetime(lifetime); | |
e9174d1e | 711 | } |
dfeec247 | 712 | TyKind::Typeof(ref expression) => visitor.visit_anon_const(expression), |
8faf50e0 | 713 | TyKind::Infer | TyKind::Err => {} |
e9174d1e SL |
714 | } |
715 | } | |
716 | ||
94222f64 XL |
717 | pub fn walk_inf<'v, V: Visitor<'v>>(visitor: &mut V, inf: &'v InferArg) { |
718 | visitor.visit_id(inf.hir_id); | |
719 | } | |
720 | ||
dfeec247 XL |
721 | pub fn walk_qpath<'v, V: Visitor<'v>>( |
722 | visitor: &mut V, | |
723 | qpath: &'v QPath<'v>, | |
724 | id: HirId, | |
725 | span: Span, | |
726 | ) { | |
476ff2be SL |
727 | match *qpath { |
728 | QPath::Resolved(ref maybe_qself, ref path) => { | |
dfeec247 | 729 | walk_list!(visitor, visit_ty, maybe_qself); |
476ff2be SL |
730 | visitor.visit_path(path, id) |
731 | } | |
732 | QPath::TypeRelative(ref qself, ref segment) => { | |
733 | visitor.visit_ty(qself); | |
734 | visitor.visit_path_segment(span, segment); | |
735 | } | |
3dfed10e | 736 | QPath::LangItem(..) => {} |
476ff2be SL |
737 | } |
738 | } | |
739 | ||
dfeec247 XL |
740 | pub fn walk_path<'v, V: Visitor<'v>>(visitor: &mut V, path: &'v Path<'v>) { |
741 | for segment in path.segments { | |
e9174d1e SL |
742 | visitor.visit_path_segment(path.span, segment); |
743 | } | |
744 | } | |
745 | ||
dfeec247 XL |
746 | pub fn walk_path_segment<'v, V: Visitor<'v>>( |
747 | visitor: &mut V, | |
748 | path_span: Span, | |
749 | segment: &'v PathSegment<'v>, | |
750 | ) { | |
8faf50e0 | 751 | visitor.visit_ident(segment.ident); |
dfeec247 | 752 | walk_list!(visitor, visit_id, segment.hir_id); |
8faf50e0 XL |
753 | if let Some(ref args) = segment.args { |
754 | visitor.visit_generic_args(path_span, args); | |
ea8adc8c | 755 | } |
e9174d1e SL |
756 | } |
757 | ||
dfeec247 XL |
758 | pub fn walk_generic_args<'v, V: Visitor<'v>>( |
759 | visitor: &mut V, | |
760 | _path_span: Span, | |
761 | generic_args: &'v GenericArgs<'v>, | |
762 | ) { | |
763 | walk_list!(visitor, visit_generic_arg, generic_args.args); | |
764 | walk_list!(visitor, visit_assoc_type_binding, generic_args.bindings); | |
e9174d1e SL |
765 | } |
766 | ||
dfeec247 XL |
767 | pub fn walk_assoc_type_binding<'v, V: Visitor<'v>>( |
768 | visitor: &mut V, | |
769 | type_binding: &'v TypeBinding<'v>, | |
770 | ) { | |
9fa01778 | 771 | visitor.visit_id(type_binding.hir_id); |
8faf50e0 | 772 | visitor.visit_ident(type_binding.ident); |
5869c6ff | 773 | visitor.visit_generic_args(type_binding.span, type_binding.gen_args); |
dc9dc135 | 774 | match type_binding.kind { |
5099ac24 FG |
775 | TypeBindingKind::Equality { ref term } => match term { |
776 | Term::Ty(ref ty) => visitor.visit_ty(ty), | |
777 | Term::Const(ref c) => visitor.visit_anon_const(c), | |
778 | }, | |
779 | TypeBindingKind::Constraint { bounds } => walk_list!(visitor, visit_param_bound, bounds), | |
dc9dc135 | 780 | } |
e9174d1e SL |
781 | } |
782 | ||
dfeec247 | 783 | pub fn walk_pat<'v, V: Visitor<'v>>(visitor: &mut V, pattern: &'v Pat<'v>) { |
9fa01778 | 784 | visitor.visit_id(pattern.hir_id); |
e74abb32 | 785 | match pattern.kind { |
dfeec247 | 786 | PatKind::TupleStruct(ref qpath, children, _) => { |
b7449926 | 787 | visitor.visit_qpath(qpath, pattern.hir_id, pattern.span); |
3157f602 | 788 | walk_list!(visitor, visit_pat, children); |
e9174d1e | 789 | } |
476ff2be | 790 | PatKind::Path(ref qpath) => { |
b7449926 | 791 | visitor.visit_qpath(qpath, pattern.hir_id, pattern.span); |
e9174d1e | 792 | } |
dfeec247 | 793 | PatKind::Struct(ref qpath, fields, _) => { |
b7449926 | 794 | visitor.visit_qpath(qpath, pattern.hir_id, pattern.span); |
e9174d1e | 795 | for field in fields { |
e1599b0c XL |
796 | visitor.visit_id(field.hir_id); |
797 | visitor.visit_ident(field.ident); | |
798 | visitor.visit_pat(&field.pat) | |
e9174d1e SL |
799 | } |
800 | } | |
dfeec247 XL |
801 | PatKind::Or(pats) => walk_list!(visitor, visit_pat, pats), |
802 | PatKind::Tuple(tuple_elements, _) => { | |
b039eaaf | 803 | walk_list!(visitor, visit_pat, tuple_elements); |
e9174d1e | 804 | } |
dfeec247 | 805 | PatKind::Box(ref subpattern) | PatKind::Ref(ref subpattern, _) => { |
b039eaaf | 806 | visitor.visit_pat(subpattern) |
e9174d1e | 807 | } |
532ac7d7 | 808 | PatKind::Binding(_, _hir_id, ident, ref optional_subpattern) => { |
8faf50e0 | 809 | visitor.visit_ident(ident); |
b039eaaf | 810 | walk_list!(visitor, visit_pat, optional_subpattern); |
e9174d1e | 811 | } |
7453a54e | 812 | PatKind::Lit(ref expression) => visitor.visit_expr(expression), |
32a655c1 | 813 | PatKind::Range(ref lower_bound, ref upper_bound, _) => { |
dfeec247 XL |
814 | walk_list!(visitor, visit_expr, lower_bound); |
815 | walk_list!(visitor, visit_expr, upper_bound); | |
e9174d1e | 816 | } |
7453a54e | 817 | PatKind::Wild => (), |
dfeec247 | 818 | PatKind::Slice(prepatterns, ref slice_pattern, postpatterns) => { |
b039eaaf SL |
819 | walk_list!(visitor, visit_pat, prepatterns); |
820 | walk_list!(visitor, visit_pat, slice_pattern); | |
821 | walk_list!(visitor, visit_pat, postpatterns); | |
e9174d1e SL |
822 | } |
823 | } | |
824 | } | |
825 | ||
dfeec247 | 826 | pub fn walk_foreign_item<'v, V: Visitor<'v>>(visitor: &mut V, foreign_item: &'v ForeignItem<'v>) { |
6a06907d | 827 | visitor.visit_id(foreign_item.hir_id()); |
0731742a | 828 | visitor.visit_ident(foreign_item.ident); |
e9174d1e | 829 | |
e74abb32 | 830 | match foreign_item.kind { |
dfeec247 | 831 | ForeignItemKind::Fn(ref function_declaration, param_names, ref generics) => { |
32a655c1 SL |
832 | visitor.visit_generics(generics); |
833 | visitor.visit_fn_decl(function_declaration); | |
8faf50e0 XL |
834 | for ¶m_name in param_names { |
835 | visitor.visit_ident(param_name); | |
32a655c1 | 836 | } |
e9174d1e | 837 | } |
8faf50e0 XL |
838 | ForeignItemKind::Static(ref typ, _) => visitor.visit_ty(typ), |
839 | ForeignItemKind::Type => (), | |
e9174d1e | 840 | } |
e9174d1e SL |
841 | } |
842 | ||
dfeec247 | 843 | pub fn walk_param_bound<'v, V: Visitor<'v>>(visitor: &mut V, bound: &'v GenericBound<'v>) { |
e9174d1e | 844 | match *bound { |
8faf50e0 | 845 | GenericBound::Trait(ref typ, modifier) => { |
e9174d1e SL |
846 | visitor.visit_poly_trait_ref(typ, modifier); |
847 | } | |
3dfed10e XL |
848 | GenericBound::LangItemTrait(_, span, hir_id, args) => { |
849 | visitor.visit_id(hir_id); | |
850 | visitor.visit_generic_args(span, args); | |
851 | } | |
8faf50e0 | 852 | GenericBound::Outlives(ref lifetime) => visitor.visit_lifetime(lifetime), |
e9174d1e SL |
853 | } |
854 | } | |
855 | ||
dfeec247 | 856 | pub fn walk_generic_param<'v, V: Visitor<'v>>(visitor: &mut V, param: &'v GenericParam<'v>) { |
9fa01778 | 857 | visitor.visit_id(param.hir_id); |
8faf50e0 XL |
858 | match param.name { |
859 | ParamName::Plain(ident) => visitor.visit_ident(ident), | |
923072b8 | 860 | ParamName::Error | ParamName::Fresh => {} |
e9174d1e | 861 | } |
8faf50e0 XL |
862 | match param.kind { |
863 | GenericParamKind::Lifetime { .. } => {} | |
864 | GenericParamKind::Type { ref default, .. } => walk_list!(visitor, visit_ty, default), | |
5869c6ff XL |
865 | GenericParamKind::Const { ref ty, ref default } => { |
866 | visitor.visit_ty(ty); | |
867 | if let Some(ref default) = default { | |
cdc7bbd5 | 868 | visitor.visit_const_param_default(param.hir_id, default); |
5869c6ff XL |
869 | } |
870 | } | |
8faf50e0 | 871 | } |
ff7c6d11 XL |
872 | } |
873 | ||
cdc7bbd5 XL |
874 | pub fn walk_const_param_default<'v, V: Visitor<'v>>(visitor: &mut V, ct: &'v AnonConst) { |
875 | visitor.visit_anon_const(ct) | |
876 | } | |
877 | ||
dfeec247 XL |
878 | pub fn walk_generics<'v, V: Visitor<'v>>(visitor: &mut V, generics: &'v Generics<'v>) { |
879 | walk_list!(visitor, visit_generic_param, generics.params); | |
04454e1e | 880 | walk_list!(visitor, visit_where_predicate, generics.predicates); |
3157f602 XL |
881 | } |
882 | ||
883 | pub fn walk_where_predicate<'v, V: Visitor<'v>>( | |
884 | visitor: &mut V, | |
dfeec247 XL |
885 | predicate: &'v WherePredicate<'v>, |
886 | ) { | |
5869c6ff XL |
887 | match *predicate { |
888 | WherePredicate::BoundPredicate(WhereBoundPredicate { | |
dfeec247 XL |
889 | ref bounded_ty, |
890 | bounds, | |
891 | bound_generic_params, | |
892 | .. | |
893 | }) => { | |
3157f602 | 894 | visitor.visit_ty(bounded_ty); |
8faf50e0 | 895 | walk_list!(visitor, visit_param_bound, bounds); |
ff7c6d11 | 896 | walk_list!(visitor, visit_generic_param, bound_generic_params); |
3157f602 | 897 | } |
5869c6ff | 898 | WherePredicate::RegionPredicate(WhereRegionPredicate { ref lifetime, bounds, .. }) => { |
3157f602 | 899 | visitor.visit_lifetime(lifetime); |
8faf50e0 | 900 | walk_list!(visitor, visit_param_bound, bounds); |
3157f602 | 901 | } |
5869c6ff | 902 | WherePredicate::EqPredicate(WhereEqPredicate { |
dfeec247 XL |
903 | hir_id, ref lhs_ty, ref rhs_ty, .. |
904 | }) => { | |
9fa01778 | 905 | visitor.visit_id(hir_id); |
32a655c1 SL |
906 | visitor.visit_ty(lhs_ty); |
907 | visitor.visit_ty(rhs_ty); | |
e9174d1e SL |
908 | } |
909 | } | |
910 | } | |
911 | ||
74b04a01 XL |
912 | pub fn walk_fn_ret_ty<'v, V: Visitor<'v>>(visitor: &mut V, ret_ty: &'v FnRetTy<'v>) { |
913 | if let FnRetTy::Return(ref output_ty) = *ret_ty { | |
b039eaaf | 914 | visitor.visit_ty(output_ty) |
e9174d1e SL |
915 | } |
916 | } | |
917 | ||
dfeec247 XL |
918 | pub fn walk_fn_decl<'v, V: Visitor<'v>>(visitor: &mut V, function_declaration: &'v FnDecl<'v>) { |
919 | for ty in function_declaration.inputs { | |
32a655c1 | 920 | visitor.visit_ty(ty) |
b039eaaf SL |
921 | } |
922 | walk_fn_ret_ty(visitor, &function_declaration.output) | |
923 | } | |
924 | ||
925 | pub fn walk_fn_kind<'v, V: Visitor<'v>>(visitor: &mut V, function_kind: FnKind<'v>) { | |
e9174d1e | 926 | match function_kind { |
9e0c209e | 927 | FnKind::ItemFn(_, generics, ..) => { |
e9174d1e SL |
928 | visitor.visit_generics(generics); |
929 | } | |
064997fb | 930 | FnKind::Closure | FnKind::Method(..) => {} |
e9174d1e SL |
931 | } |
932 | } | |
933 | ||
dfeec247 XL |
934 | pub fn walk_fn<'v, V: Visitor<'v>>( |
935 | visitor: &mut V, | |
936 | function_kind: FnKind<'v>, | |
937 | function_declaration: &'v FnDecl<'v>, | |
938 | body_id: BodyId, | |
939 | _span: Span, | |
940 | id: HirId, | |
941 | ) { | |
5bcae85e | 942 | visitor.visit_id(id); |
32a655c1 | 943 | visitor.visit_fn_decl(function_declaration); |
e9174d1e | 944 | walk_fn_kind(visitor, function_kind); |
32a655c1 | 945 | visitor.visit_nested_body(body_id) |
e9174d1e SL |
946 | } |
947 | ||
dfeec247 | 948 | pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v TraitItem<'v>) { |
064997fb FG |
949 | // N.B., deliberately force a compilation error if/when new fields are added. |
950 | let TraitItem { ident, generics, ref defaultness, ref kind, span, def_id: _ } = *trait_item; | |
951 | let hir_id = trait_item.hir_id(); | |
952 | visitor.visit_ident(ident); | |
953 | visitor.visit_generics(&generics); | |
954 | visitor.visit_defaultness(&defaultness); | |
955 | match *kind { | |
32a655c1 | 956 | TraitItemKind::Const(ref ty, default) => { |
064997fb | 957 | visitor.visit_id(hir_id); |
e9174d1e | 958 | visitor.visit_ty(ty); |
32a655c1 | 959 | walk_list!(visitor, visit_nested_body, default); |
e9174d1e | 960 | } |
ba9703b0 | 961 | TraitItemKind::Fn(ref sig, TraitFn::Required(param_names)) => { |
064997fb | 962 | visitor.visit_id(hir_id); |
32a655c1 | 963 | visitor.visit_fn_decl(&sig.decl); |
8faf50e0 XL |
964 | for ¶m_name in param_names { |
965 | visitor.visit_ident(param_name); | |
32a655c1 | 966 | } |
e9174d1e | 967 | } |
ba9703b0 | 968 | TraitItemKind::Fn(ref sig, TraitFn::Provided(body_id)) => { |
064997fb | 969 | visitor.visit_fn(FnKind::Method(ident, sig), &sig.decl, body_id, span, hir_id); |
dfeec247 XL |
970 | } |
971 | TraitItemKind::Type(bounds, ref default) => { | |
064997fb | 972 | visitor.visit_id(hir_id); |
8faf50e0 | 973 | walk_list!(visitor, visit_param_bound, bounds); |
b039eaaf | 974 | walk_list!(visitor, visit_ty, default); |
e9174d1e SL |
975 | } |
976 | } | |
977 | } | |
978 | ||
32a655c1 | 979 | pub fn walk_trait_item_ref<'v, V: Visitor<'v>>(visitor: &mut V, trait_item_ref: &'v TraitItemRef) { |
0731742a | 980 | // N.B., deliberately force a compilation error if/when new fields are added. |
064997fb | 981 | let TraitItemRef { id, ident, ref kind, span: _ } = *trait_item_ref; |
32a655c1 | 982 | visitor.visit_nested_trait_item(id); |
8faf50e0 | 983 | visitor.visit_ident(ident); |
32a655c1 | 984 | visitor.visit_associated_item_kind(kind); |
32a655c1 SL |
985 | } |
986 | ||
dfeec247 | 987 | pub fn walk_impl_item<'v, V: Visitor<'v>>(visitor: &mut V, impl_item: &'v ImplItem<'v>) { |
0731742a | 988 | // N.B., deliberately force a compilation error if/when new fields are added. |
064997fb FG |
989 | let ImplItem { |
990 | def_id: _, | |
991 | ident, | |
992 | ref generics, | |
993 | ref kind, | |
994 | ref defaultness, | |
995 | span: _, | |
996 | vis_span: _, | |
997 | } = *impl_item; | |
476ff2be | 998 | |
8faf50e0 | 999 | visitor.visit_ident(ident); |
abe05a73 | 1000 | visitor.visit_generics(generics); |
064997fb | 1001 | visitor.visit_defaultness(defaultness); |
e74abb32 | 1002 | match *kind { |
32a655c1 | 1003 | ImplItemKind::Const(ref ty, body) => { |
6a06907d | 1004 | visitor.visit_id(impl_item.hir_id()); |
e9174d1e | 1005 | visitor.visit_ty(ty); |
32a655c1 | 1006 | visitor.visit_nested_body(body); |
e9174d1e | 1007 | } |
ba9703b0 | 1008 | ImplItemKind::Fn(ref sig, body_id) => { |
dfeec247 | 1009 | visitor.visit_fn( |
04454e1e | 1010 | FnKind::Method(impl_item.ident, sig), |
dfeec247 XL |
1011 | &sig.decl, |
1012 | body_id, | |
1013 | impl_item.span, | |
6a06907d | 1014 | impl_item.hir_id(), |
dfeec247 | 1015 | ); |
e9174d1e | 1016 | } |
416331ca | 1017 | ImplItemKind::TyAlias(ref ty) => { |
6a06907d | 1018 | visitor.visit_id(impl_item.hir_id()); |
e9174d1e SL |
1019 | visitor.visit_ty(ty); |
1020 | } | |
1021 | } | |
1022 | } | |
1023 | ||
fc512014 XL |
1024 | pub fn walk_foreign_item_ref<'v, V: Visitor<'v>>( |
1025 | visitor: &mut V, | |
c295e0f8 | 1026 | foreign_item_ref: &'v ForeignItemRef, |
fc512014 XL |
1027 | ) { |
1028 | // N.B., deliberately force a compilation error if/when new fields are added. | |
c295e0f8 | 1029 | let ForeignItemRef { id, ident, span: _ } = *foreign_item_ref; |
fc512014 XL |
1030 | visitor.visit_nested_foreign_item(id); |
1031 | visitor.visit_ident(ident); | |
fc512014 XL |
1032 | } |
1033 | ||
c295e0f8 | 1034 | pub fn walk_impl_item_ref<'v, V: Visitor<'v>>(visitor: &mut V, impl_item_ref: &'v ImplItemRef) { |
0731742a | 1035 | // N.B., deliberately force a compilation error if/when new fields are added. |
064997fb | 1036 | let ImplItemRef { id, ident, ref kind, span: _, trait_item_def_id: _ } = *impl_item_ref; |
476ff2be | 1037 | visitor.visit_nested_impl_item(id); |
8faf50e0 | 1038 | visitor.visit_ident(ident); |
476ff2be | 1039 | visitor.visit_associated_item_kind(kind); |
476ff2be SL |
1040 | } |
1041 | ||
dfeec247 XL |
1042 | pub fn walk_struct_def<'v, V: Visitor<'v>>( |
1043 | visitor: &mut V, | |
1044 | struct_definition: &'v VariantData<'v>, | |
1045 | ) { | |
1046 | walk_list!(visitor, visit_id, struct_definition.ctor_hir_id()); | |
6a06907d | 1047 | walk_list!(visitor, visit_field_def, struct_definition.fields()); |
e9174d1e SL |
1048 | } |
1049 | ||
6a06907d XL |
1050 | pub fn walk_field_def<'v, V: Visitor<'v>>(visitor: &mut V, field: &'v FieldDef<'v>) { |
1051 | visitor.visit_id(field.hir_id); | |
6a06907d XL |
1052 | visitor.visit_ident(field.ident); |
1053 | visitor.visit_ty(&field.ty); | |
e9174d1e SL |
1054 | } |
1055 | ||
dfeec247 | 1056 | pub fn walk_block<'v, V: Visitor<'v>>(visitor: &mut V, block: &'v Block<'v>) { |
9fa01778 | 1057 | visitor.visit_id(block.hir_id); |
dfeec247 | 1058 | walk_list!(visitor, visit_stmt, block.stmts); |
b039eaaf | 1059 | walk_list!(visitor, visit_expr, &block.expr); |
e9174d1e SL |
1060 | } |
1061 | ||
dfeec247 | 1062 | pub fn walk_stmt<'v, V: Visitor<'v>>(visitor: &mut V, statement: &'v Stmt<'v>) { |
9fa01778 | 1063 | visitor.visit_id(statement.hir_id); |
e74abb32 | 1064 | match statement.kind { |
9fa01778 XL |
1065 | StmtKind::Local(ref local) => visitor.visit_local(local), |
1066 | StmtKind::Item(item) => visitor.visit_nested_item(item), | |
dfeec247 | 1067 | StmtKind::Expr(ref expression) | StmtKind::Semi(ref expression) => { |
b039eaaf | 1068 | visitor.visit_expr(expression) |
e9174d1e SL |
1069 | } |
1070 | } | |
1071 | } | |
1072 | ||
a2a8927a XL |
1073 | pub fn walk_array_len<'v, V: Visitor<'v>>(visitor: &mut V, len: &'v ArrayLen) { |
1074 | match len { | |
1075 | &ArrayLen::Infer(hir_id, _span) => visitor.visit_id(hir_id), | |
1076 | ArrayLen::Body(c) => visitor.visit_anon_const(c), | |
1077 | } | |
1078 | } | |
1079 | ||
94b46f34 | 1080 | pub fn walk_anon_const<'v, V: Visitor<'v>>(visitor: &mut V, constant: &'v AnonConst) { |
9fa01778 | 1081 | visitor.visit_id(constant.hir_id); |
94b46f34 XL |
1082 | visitor.visit_nested_body(constant.body); |
1083 | } | |
1084 | ||
a2a8927a XL |
1085 | pub fn walk_let_expr<'v, V: Visitor<'v>>(visitor: &mut V, let_expr: &'v Let<'v>) { |
1086 | // match the visit order in walk_local | |
1087 | visitor.visit_expr(let_expr.init); | |
1088 | visitor.visit_id(let_expr.hir_id); | |
1089 | visitor.visit_pat(let_expr.pat); | |
1090 | walk_list!(visitor, visit_ty, let_expr.ty); | |
1091 | } | |
1092 | ||
dfeec247 | 1093 | pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr<'v>) { |
9fa01778 | 1094 | visitor.visit_id(expression.hir_id); |
e74abb32 | 1095 | match expression.kind { |
dfeec247 XL |
1096 | ExprKind::Box(ref subexpression) => visitor.visit_expr(subexpression), |
1097 | ExprKind::Array(subexpressions) => { | |
b039eaaf | 1098 | walk_list!(visitor, visit_expr, subexpressions); |
e9174d1e | 1099 | } |
29967ef6 | 1100 | ExprKind::ConstBlock(ref anon_const) => visitor.visit_anon_const(anon_const), |
8faf50e0 | 1101 | ExprKind::Repeat(ref element, ref count) => { |
b039eaaf | 1102 | visitor.visit_expr(element); |
a2a8927a | 1103 | visitor.visit_array_length(count) |
e9174d1e | 1104 | } |
dfeec247 | 1105 | ExprKind::Struct(ref qpath, fields, ref optional_base) => { |
b7449926 | 1106 | visitor.visit_qpath(qpath, expression.hir_id, expression.span); |
e9174d1e | 1107 | for field in fields { |
9fa01778 | 1108 | visitor.visit_id(field.hir_id); |
94b46f34 | 1109 | visitor.visit_ident(field.ident); |
b039eaaf | 1110 | visitor.visit_expr(&field.expr) |
e9174d1e | 1111 | } |
b039eaaf | 1112 | walk_list!(visitor, visit_expr, optional_base); |
e9174d1e | 1113 | } |
dfeec247 | 1114 | ExprKind::Tup(subexpressions) => { |
b039eaaf | 1115 | walk_list!(visitor, visit_expr, subexpressions); |
e9174d1e | 1116 | } |
dfeec247 | 1117 | ExprKind::Call(ref callee_expression, arguments) => { |
2c00a5a8 | 1118 | visitor.visit_expr(callee_expression); |
b039eaaf | 1119 | walk_list!(visitor, visit_expr, arguments); |
e9174d1e | 1120 | } |
5099ac24 | 1121 | ExprKind::MethodCall(ref segment, arguments, _) => { |
041b39d2 | 1122 | visitor.visit_path_segment(expression.span, segment); |
b039eaaf | 1123 | walk_list!(visitor, visit_expr, arguments); |
e9174d1e | 1124 | } |
8faf50e0 | 1125 | ExprKind::Binary(_, ref left_expression, ref right_expression) => { |
b039eaaf SL |
1126 | visitor.visit_expr(left_expression); |
1127 | visitor.visit_expr(right_expression) | |
e9174d1e | 1128 | } |
60c5eb7d | 1129 | ExprKind::AddrOf(_, _, ref subexpression) | ExprKind::Unary(_, ref subexpression) => { |
b039eaaf | 1130 | visitor.visit_expr(subexpression) |
e9174d1e | 1131 | } |
8faf50e0 | 1132 | ExprKind::Cast(ref subexpression, ref typ) | ExprKind::Type(ref subexpression, ref typ) => { |
b039eaaf SL |
1133 | visitor.visit_expr(subexpression); |
1134 | visitor.visit_ty(typ) | |
e9174d1e | 1135 | } |
48663c56 XL |
1136 | ExprKind::DropTemps(ref subexpression) => { |
1137 | visitor.visit_expr(subexpression); | |
e9174d1e | 1138 | } |
a2a8927a | 1139 | ExprKind::Let(ref let_expr) => visitor.visit_let_expr(let_expr), |
5869c6ff XL |
1140 | ExprKind::If(ref cond, ref then, ref else_opt) => { |
1141 | visitor.visit_expr(cond); | |
1142 | visitor.visit_expr(then); | |
1143 | walk_list!(visitor, visit_expr, else_opt); | |
1144 | } | |
1145 | ExprKind::Loop(ref block, ref opt_label, _, _) => { | |
2c00a5a8 | 1146 | walk_list!(visitor, visit_label, opt_label); |
b039eaaf | 1147 | visitor.visit_block(block); |
e9174d1e | 1148 | } |
dfeec247 | 1149 | ExprKind::Match(ref subexpression, arms, _) => { |
b039eaaf SL |
1150 | visitor.visit_expr(subexpression); |
1151 | walk_list!(visitor, visit_arm, arms); | |
e9174d1e | 1152 | } |
064997fb FG |
1153 | ExprKind::Closure(&Closure { |
1154 | binder: _, | |
923072b8 | 1155 | bound_generic_params, |
064997fb | 1156 | fn_decl, |
923072b8 FG |
1157 | body, |
1158 | capture_clause: _, | |
1159 | fn_decl_span: _, | |
1160 | movability: _, | |
064997fb | 1161 | }) => { |
923072b8 FG |
1162 | walk_list!(visitor, visit_generic_param, bound_generic_params); |
1163 | visitor.visit_fn(FnKind::Closure, fn_decl, body, expression.span, expression.hir_id) | |
1164 | } | |
8faf50e0 | 1165 | ExprKind::Block(ref block, ref opt_label) => { |
94b46f34 XL |
1166 | walk_list!(visitor, visit_label, opt_label); |
1167 | visitor.visit_block(block); | |
1168 | } | |
dfeec247 XL |
1169 | ExprKind::Assign(ref lhs, ref rhs, _) => { |
1170 | visitor.visit_expr(rhs); | |
1171 | visitor.visit_expr(lhs) | |
e9174d1e | 1172 | } |
8faf50e0 | 1173 | ExprKind::AssignOp(_, ref left_expression, ref right_expression) => { |
b039eaaf | 1174 | visitor.visit_expr(right_expression); |
dc9dc135 | 1175 | visitor.visit_expr(left_expression); |
e9174d1e | 1176 | } |
8faf50e0 | 1177 | ExprKind::Field(ref subexpression, ident) => { |
b039eaaf | 1178 | visitor.visit_expr(subexpression); |
94b46f34 | 1179 | visitor.visit_ident(ident); |
e9174d1e | 1180 | } |
8faf50e0 | 1181 | ExprKind::Index(ref main_expression, ref index_expression) => { |
b039eaaf SL |
1182 | visitor.visit_expr(main_expression); |
1183 | visitor.visit_expr(index_expression) | |
e9174d1e | 1184 | } |
8faf50e0 | 1185 | ExprKind::Path(ref qpath) => { |
b7449926 | 1186 | visitor.visit_qpath(qpath, expression.hir_id, expression.span); |
e9174d1e | 1187 | } |
8faf50e0 | 1188 | ExprKind::Break(ref destination, ref opt_expr) => { |
dfeec247 | 1189 | walk_list!(visitor, visit_label, &destination.label); |
476ff2be SL |
1190 | walk_list!(visitor, visit_expr, opt_expr); |
1191 | } | |
8faf50e0 | 1192 | ExprKind::Continue(ref destination) => { |
dfeec247 | 1193 | walk_list!(visitor, visit_label, &destination.label); |
e9174d1e | 1194 | } |
8faf50e0 | 1195 | ExprKind::Ret(ref optional_expression) => { |
b039eaaf | 1196 | walk_list!(visitor, visit_expr, optional_expression); |
e9174d1e | 1197 | } |
f9f354fc | 1198 | ExprKind::InlineAsm(ref asm) => { |
04454e1e | 1199 | visitor.visit_inline_asm(asm, expression.hir_id); |
f9f354fc | 1200 | } |
dc9dc135 | 1201 | ExprKind::Yield(ref subexpression, _) => { |
ea8adc8c XL |
1202 | visitor.visit_expr(subexpression); |
1203 | } | |
dc9dc135 | 1204 | ExprKind::Lit(_) | ExprKind::Err => {} |
e9174d1e | 1205 | } |
e9174d1e SL |
1206 | } |
1207 | ||
dfeec247 | 1208 | pub fn walk_arm<'v, V: Visitor<'v>>(visitor: &mut V, arm: &'v Arm<'v>) { |
dc9dc135 | 1209 | visitor.visit_id(arm.hir_id); |
e74abb32 | 1210 | visitor.visit_pat(&arm.pat); |
b7449926 XL |
1211 | if let Some(ref g) = arm.guard { |
1212 | match g { | |
1213 | Guard::If(ref e) => visitor.visit_expr(e), | |
923072b8 FG |
1214 | Guard::IfLet(ref l) => { |
1215 | visitor.visit_let_expr(l); | |
fc512014 | 1216 | } |
b7449926 XL |
1217 | } |
1218 | } | |
b039eaaf | 1219 | visitor.visit_expr(&arm.body); |
e9174d1e | 1220 | } |
54a0048b | 1221 | |
dc9dc135 | 1222 | pub fn walk_associated_item_kind<'v, V: Visitor<'v>>(_: &mut V, _: &'v AssocItemKind) { |
476ff2be SL |
1223 | // No visitable content here: this fn exists so you can call it if |
1224 | // the right thing to do, should content be added in the future, | |
1225 | // would be to walk it. | |
1226 | } | |
1227 | ||
1228 | pub fn walk_defaultness<'v, V: Visitor<'v>>(_: &mut V, _: &'v Defaultness) { | |
1229 | // No visitable content here: this fn exists so you can call it if | |
1230 | // the right thing to do, should content be added in the future, | |
1231 | // would be to walk it. | |
1232 | } |