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Commit | Line | Data |
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cdc7bbd5 | 1 | use crate::def::{CtorKind, DefKind, Res}; |
3c0e092e | 2 | use crate::def_id::DefId; |
17df50a5 | 3 | crate use crate::hir_id::{HirId, ItemLocalId}; |
3c0e092e | 4 | use crate::intravisit::FnKind; |
c295e0f8 | 5 | use crate::LangItem; |
dfeec247 | 6 | |
74b04a01 | 7 | use rustc_ast::util::parser::ExprPrecedence; |
5099ac24 FG |
8 | use rustc_ast::{self as ast, CrateSugar}; |
9 | use rustc_ast::{Attribute, FloatTy, IntTy, Label, LitKind, TraitObjectSyntax, UintTy}; | |
3dfed10e XL |
10 | pub use rustc_ast::{BorrowKind, ImplPolarity, IsAuto}; |
11 | pub use rustc_ast::{CaptureBy, Movability, Mutability}; | |
12 | use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece}; | |
3c0e092e | 13 | use rustc_data_structures::fingerprint::Fingerprint; |
17df50a5 | 14 | use rustc_data_structures::fx::FxHashMap; |
3c0e092e | 15 | use rustc_data_structures::sorted_map::SortedMap; |
94222f64 | 16 | use rustc_index::vec::IndexVec; |
dfeec247 | 17 | use rustc_macros::HashStable_Generic; |
17df50a5 | 18 | use rustc_span::source_map::Spanned; |
f9f354fc | 19 | use rustc_span::symbol::{kw, sym, Ident, Symbol}; |
a2a8927a | 20 | use rustc_span::{def_id::LocalDefId, BytePos, MultiSpan, Span, DUMMY_SP}; |
f9f354fc | 21 | use rustc_target::asm::InlineAsmRegOrRegClass; |
dfeec247 | 22 | use rustc_target::spec::abi::Abi; |
74b04a01 | 23 | |
dfeec247 | 24 | use smallvec::SmallVec; |
dfeec247 | 25 | use std::fmt; |
dfeec247 | 26 | |
3dfed10e | 27 | #[derive(Copy, Clone, Encodable, HashStable_Generic)] |
dfeec247 XL |
28 | pub struct Lifetime { |
29 | pub hir_id: HirId, | |
30 | pub span: Span, | |
31 | ||
32 | /// Either "`'a`", referring to a named lifetime definition, | |
5869c6ff | 33 | /// or "``" (i.e., `kw::Empty`), for elision placeholders. |
dfeec247 XL |
34 | /// |
35 | /// HIR lowering inserts these placeholders in type paths that | |
36 | /// refer to type definitions needing lifetime parameters, | |
37 | /// `&T` and `&mut T`, and trait objects without `... + 'a`. | |
38 | pub name: LifetimeName, | |
39 | } | |
40 | ||
3dfed10e | 41 | #[derive(Debug, Clone, PartialEq, Eq, Encodable, Hash, Copy)] |
dfeec247 XL |
42 | #[derive(HashStable_Generic)] |
43 | pub enum ParamName { | |
44 | /// Some user-given name like `T` or `'x`. | |
45 | Plain(Ident), | |
46 | ||
47 | /// Synthetic name generated when user elided a lifetime in an impl header. | |
48 | /// | |
49 | /// E.g., the lifetimes in cases like these: | |
50 | /// | |
51 | /// impl Foo for &u32 | |
52 | /// impl Foo<'_> for u32 | |
53 | /// | |
54 | /// in that case, we rewrite to | |
55 | /// | |
56 | /// impl<'f> Foo for &'f u32 | |
57 | /// impl<'f> Foo<'f> for u32 | |
58 | /// | |
59 | /// where `'f` is something like `Fresh(0)`. The indices are | |
60 | /// unique per impl, but not necessarily continuous. | |
61 | Fresh(usize), | |
62 | ||
63 | /// Indicates an illegal name was given and an error has been | |
64 | /// reported (so we should squelch other derived errors). Occurs | |
65 | /// when, e.g., `'_` is used in the wrong place. | |
66 | Error, | |
67 | } | |
68 | ||
69 | impl ParamName { | |
70 | pub fn ident(&self) -> Ident { | |
71 | match *self { | |
72 | ParamName::Plain(ident) => ident, | |
73 | ParamName::Fresh(_) | ParamName::Error => { | |
74 | Ident::with_dummy_span(kw::UnderscoreLifetime) | |
75 | } | |
76 | } | |
77 | } | |
78 | ||
ba9703b0 | 79 | pub fn normalize_to_macros_2_0(&self) -> ParamName { |
dfeec247 | 80 | match *self { |
ba9703b0 | 81 | ParamName::Plain(ident) => ParamName::Plain(ident.normalize_to_macros_2_0()), |
dfeec247 XL |
82 | param_name => param_name, |
83 | } | |
84 | } | |
85 | } | |
86 | ||
3dfed10e | 87 | #[derive(Debug, Clone, PartialEq, Eq, Encodable, Hash, Copy)] |
dfeec247 XL |
88 | #[derive(HashStable_Generic)] |
89 | pub enum LifetimeName { | |
90 | /// User-given names or fresh (synthetic) names. | |
91 | Param(ParamName), | |
92 | ||
93 | /// User wrote nothing (e.g., the lifetime in `&u32`). | |
a2a8927a XL |
94 | /// |
95 | /// The bool indicates whether the user should have written something. | |
96 | Implicit(bool), | |
dfeec247 XL |
97 | |
98 | /// Implicit lifetime in a context like `dyn Foo`. This is | |
99 | /// distinguished from implicit lifetimes elsewhere because the | |
100 | /// lifetime that they default to must appear elsewhere within the | |
101 | /// enclosing type. This means that, in an `impl Trait` context, we | |
102 | /// don't have to create a parameter for them. That is, `impl | |
103 | /// Trait<Item = &u32>` expands to an opaque type like `type | |
104 | /// Foo<'a> = impl Trait<Item = &'a u32>`, but `impl Trait<item = | |
105 | /// dyn Bar>` expands to `type Foo = impl Trait<Item = dyn Bar + | |
106 | /// 'static>`. The latter uses `ImplicitObjectLifetimeDefault` so | |
107 | /// that surrounding code knows not to create a lifetime | |
108 | /// parameter. | |
109 | ImplicitObjectLifetimeDefault, | |
110 | ||
111 | /// Indicates an error during lowering (usually `'_` in wrong place) | |
112 | /// that was already reported. | |
113 | Error, | |
114 | ||
115 | /// User wrote specifies `'_`. | |
116 | Underscore, | |
117 | ||
118 | /// User wrote `'static`. | |
119 | Static, | |
120 | } | |
121 | ||
122 | impl LifetimeName { | |
123 | pub fn ident(&self) -> Ident { | |
124 | match *self { | |
125 | LifetimeName::ImplicitObjectLifetimeDefault | |
a2a8927a | 126 | | LifetimeName::Implicit(_) |
3c0e092e | 127 | | LifetimeName::Error => Ident::empty(), |
dfeec247 XL |
128 | LifetimeName::Underscore => Ident::with_dummy_span(kw::UnderscoreLifetime), |
129 | LifetimeName::Static => Ident::with_dummy_span(kw::StaticLifetime), | |
130 | LifetimeName::Param(param_name) => param_name.ident(), | |
131 | } | |
132 | } | |
133 | ||
134 | pub fn is_elided(&self) -> bool { | |
135 | match self { | |
136 | LifetimeName::ImplicitObjectLifetimeDefault | |
a2a8927a | 137 | | LifetimeName::Implicit(_) |
dfeec247 XL |
138 | | LifetimeName::Underscore => true, |
139 | ||
140 | // It might seem surprising that `Fresh(_)` counts as | |
141 | // *not* elided -- but this is because, as far as the code | |
142 | // in the compiler is concerned -- `Fresh(_)` variants act | |
143 | // equivalently to "some fresh name". They correspond to | |
144 | // early-bound regions on an impl, in other words. | |
145 | LifetimeName::Error | LifetimeName::Param(_) | LifetimeName::Static => false, | |
146 | } | |
147 | } | |
148 | ||
149 | fn is_static(&self) -> bool { | |
150 | self == &LifetimeName::Static | |
151 | } | |
152 | ||
ba9703b0 | 153 | pub fn normalize_to_macros_2_0(&self) -> LifetimeName { |
dfeec247 | 154 | match *self { |
ba9703b0 XL |
155 | LifetimeName::Param(param_name) => { |
156 | LifetimeName::Param(param_name.normalize_to_macros_2_0()) | |
157 | } | |
dfeec247 XL |
158 | lifetime_name => lifetime_name, |
159 | } | |
160 | } | |
161 | } | |
162 | ||
163 | impl fmt::Display for Lifetime { | |
164 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
165 | self.name.ident().fmt(f) | |
166 | } | |
167 | } | |
168 | ||
169 | impl fmt::Debug for Lifetime { | |
170 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
ba9703b0 | 171 | write!(f, "lifetime({}: {})", self.hir_id, self.name.ident()) |
dfeec247 XL |
172 | } |
173 | } | |
174 | ||
175 | impl Lifetime { | |
176 | pub fn is_elided(&self) -> bool { | |
177 | self.name.is_elided() | |
178 | } | |
179 | ||
180 | pub fn is_static(&self) -> bool { | |
181 | self.name.is_static() | |
182 | } | |
183 | } | |
184 | ||
185 | /// A `Path` is essentially Rust's notion of a name; for instance, | |
186 | /// `std::cmp::PartialEq`. It's represented as a sequence of identifiers, | |
187 | /// along with a bunch of supporting information. | |
3dfed10e | 188 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
189 | pub struct Path<'hir> { |
190 | pub span: Span, | |
191 | /// The resolution for the path. | |
192 | pub res: Res, | |
193 | /// The segments in the path: the things separated by `::`. | |
194 | pub segments: &'hir [PathSegment<'hir>], | |
195 | } | |
196 | ||
197 | impl Path<'_> { | |
198 | pub fn is_global(&self) -> bool { | |
199 | !self.segments.is_empty() && self.segments[0].ident.name == kw::PathRoot | |
200 | } | |
201 | } | |
202 | ||
dfeec247 XL |
203 | /// A segment of a path: an identifier, an optional lifetime, and a set of |
204 | /// types. | |
3dfed10e | 205 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
206 | pub struct PathSegment<'hir> { |
207 | /// The identifier portion of this path segment. | |
dfeec247 XL |
208 | pub ident: Ident, |
209 | // `id` and `res` are optional. We currently only use these in save-analysis, | |
210 | // any path segments without these will not have save-analysis info and | |
211 | // therefore will not have 'jump to def' in IDEs, but otherwise will not be | |
212 | // affected. (In general, we don't bother to get the defs for synthesized | |
213 | // segments, only for segments which have come from the AST). | |
214 | pub hir_id: Option<HirId>, | |
215 | pub res: Option<Res>, | |
216 | ||
217 | /// Type/lifetime parameters attached to this path. They come in | |
218 | /// two flavors: `Path<A,B,C>` and `Path(A,B) -> C`. Note that | |
219 | /// this is more than just simple syntactic sugar; the use of | |
220 | /// parens affects the region binding rules, so we preserve the | |
221 | /// distinction. | |
222 | pub args: Option<&'hir GenericArgs<'hir>>, | |
223 | ||
224 | /// Whether to infer remaining type parameters, if any. | |
225 | /// This only applies to expression and pattern paths, and | |
226 | /// out of those only the segments with no type parameters | |
227 | /// to begin with, e.g., `Vec::new` is `<Vec<..>>::new::<..>`. | |
228 | pub infer_args: bool, | |
229 | } | |
230 | ||
231 | impl<'hir> PathSegment<'hir> { | |
232 | /// Converts an identifier to the corresponding segment. | |
233 | pub fn from_ident(ident: Ident) -> PathSegment<'hir> { | |
234 | PathSegment { ident, hir_id: None, res: None, infer_args: true, args: None } | |
235 | } | |
236 | ||
5869c6ff | 237 | pub fn invalid() -> Self { |
3c0e092e | 238 | Self::from_ident(Ident::empty()) |
5869c6ff XL |
239 | } |
240 | ||
241 | pub fn args(&self) -> &GenericArgs<'hir> { | |
dfeec247 XL |
242 | if let Some(ref args) = self.args { |
243 | args | |
244 | } else { | |
245 | const DUMMY: &GenericArgs<'_> = &GenericArgs::none(); | |
246 | DUMMY | |
247 | } | |
248 | } | |
249 | } | |
250 | ||
3dfed10e | 251 | #[derive(Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
252 | pub struct ConstArg { |
253 | pub value: AnonConst, | |
254 | pub span: Span, | |
255 | } | |
256 | ||
94222f64 XL |
257 | #[derive(Encodable, Debug, HashStable_Generic)] |
258 | pub struct InferArg { | |
259 | pub hir_id: HirId, | |
94222f64 XL |
260 | pub span: Span, |
261 | } | |
262 | ||
263 | impl InferArg { | |
264 | pub fn to_ty(&self) -> Ty<'_> { | |
265 | Ty { kind: TyKind::Infer, span: self.span, hir_id: self.hir_id } | |
266 | } | |
267 | } | |
268 | ||
3dfed10e | 269 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
270 | pub enum GenericArg<'hir> { |
271 | Lifetime(Lifetime), | |
272 | Type(Ty<'hir>), | |
273 | Const(ConstArg), | |
94222f64 | 274 | Infer(InferArg), |
dfeec247 XL |
275 | } |
276 | ||
277 | impl GenericArg<'_> { | |
278 | pub fn span(&self) -> Span { | |
279 | match self { | |
280 | GenericArg::Lifetime(l) => l.span, | |
281 | GenericArg::Type(t) => t.span, | |
282 | GenericArg::Const(c) => c.span, | |
94222f64 | 283 | GenericArg::Infer(i) => i.span, |
dfeec247 XL |
284 | } |
285 | } | |
286 | ||
287 | pub fn id(&self) -> HirId { | |
288 | match self { | |
289 | GenericArg::Lifetime(l) => l.hir_id, | |
290 | GenericArg::Type(t) => t.hir_id, | |
291 | GenericArg::Const(c) => c.value.hir_id, | |
94222f64 | 292 | GenericArg::Infer(i) => i.hir_id, |
dfeec247 XL |
293 | } |
294 | } | |
295 | ||
5869c6ff | 296 | pub fn is_synthetic(&self) -> bool { |
3c0e092e | 297 | matches!(self, GenericArg::Lifetime(lifetime) if lifetime.name.ident() == Ident::empty()) |
5869c6ff XL |
298 | } |
299 | ||
74b04a01 XL |
300 | pub fn descr(&self) -> &'static str { |
301 | match self { | |
302 | GenericArg::Lifetime(_) => "lifetime", | |
303 | GenericArg::Type(_) => "type", | |
304 | GenericArg::Const(_) => "constant", | |
94222f64 | 305 | GenericArg::Infer(_) => "inferred", |
74b04a01 XL |
306 | } |
307 | } | |
fc512014 | 308 | |
a2a8927a | 309 | pub fn to_ord(&self) -> ast::ParamKindOrd { |
fc512014 | 310 | match self { |
5869c6ff XL |
311 | GenericArg::Lifetime(_) => ast::ParamKindOrd::Lifetime, |
312 | GenericArg::Type(_) => ast::ParamKindOrd::Type, | |
a2a8927a | 313 | GenericArg::Const(_) => ast::ParamKindOrd::Const, |
94222f64 | 314 | GenericArg::Infer(_) => ast::ParamKindOrd::Infer, |
fc512014 XL |
315 | } |
316 | } | |
5099ac24 FG |
317 | |
318 | pub fn is_ty_or_const(&self) -> bool { | |
319 | match self { | |
320 | GenericArg::Lifetime(_) => false, | |
321 | GenericArg::Type(_) | GenericArg::Const(_) | GenericArg::Infer(_) => true, | |
322 | } | |
323 | } | |
dfeec247 XL |
324 | } |
325 | ||
3dfed10e | 326 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
327 | pub struct GenericArgs<'hir> { |
328 | /// The generic arguments for this path segment. | |
329 | pub args: &'hir [GenericArg<'hir>], | |
330 | /// Bindings (equality constraints) on associated types, if present. | |
331 | /// E.g., `Foo<A = Bar>`. | |
332 | pub bindings: &'hir [TypeBinding<'hir>], | |
333 | /// Were arguments written in parenthesized form `Fn(T) -> U`? | |
334 | /// This is required mostly for pretty-printing and diagnostics, | |
335 | /// but also for changing lifetime elision rules to be "function-like". | |
336 | pub parenthesized: bool, | |
17df50a5 XL |
337 | /// The span encompassing arguments and the surrounding brackets `<>` or `()` |
338 | /// Foo<A, B, AssocTy = D> Fn(T, U, V) -> W | |
339 | /// ^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^ | |
340 | /// Note that this may be: | |
341 | /// - empty, if there are no generic brackets (but there may be hidden lifetimes) | |
342 | /// - dummy, if this was generated while desugaring | |
343 | pub span_ext: Span, | |
dfeec247 XL |
344 | } |
345 | ||
346 | impl GenericArgs<'_> { | |
347 | pub const fn none() -> Self { | |
17df50a5 | 348 | Self { args: &[], bindings: &[], parenthesized: false, span_ext: DUMMY_SP } |
dfeec247 XL |
349 | } |
350 | ||
dfeec247 XL |
351 | pub fn inputs(&self) -> &[Ty<'_>] { |
352 | if self.parenthesized { | |
353 | for arg in self.args { | |
354 | match arg { | |
355 | GenericArg::Lifetime(_) => {} | |
356 | GenericArg::Type(ref ty) => { | |
357 | if let TyKind::Tup(ref tys) = ty.kind { | |
358 | return tys; | |
359 | } | |
360 | break; | |
361 | } | |
362 | GenericArg::Const(_) => {} | |
94222f64 | 363 | GenericArg::Infer(_) => {} |
dfeec247 XL |
364 | } |
365 | } | |
366 | } | |
367 | panic!("GenericArgs::inputs: not a `Fn(T) -> U`"); | |
368 | } | |
369 | ||
94222f64 XL |
370 | #[inline] |
371 | pub fn has_type_params(&self) -> bool { | |
372 | self.args.iter().any(|arg| matches!(arg, GenericArg::Type(_))) | |
373 | } | |
dfeec247 | 374 | |
c295e0f8 XL |
375 | pub fn has_err(&self) -> bool { |
376 | self.args.iter().any(|arg| match arg { | |
377 | GenericArg::Type(ty) => matches!(ty.kind, TyKind::Err), | |
378 | _ => false, | |
379 | }) || self.bindings.iter().any(|arg| match arg.kind { | |
5099ac24 | 380 | TypeBindingKind::Equality { term: Term::Ty(ty) } => matches!(ty.kind, TyKind::Err), |
c295e0f8 XL |
381 | _ => false, |
382 | }) | |
383 | } | |
384 | ||
94222f64 XL |
385 | #[inline] |
386 | pub fn num_type_params(&self) -> usize { | |
387 | self.args.iter().filter(|arg| matches!(arg, GenericArg::Type(_))).count() | |
388 | } | |
389 | ||
390 | #[inline] | |
391 | pub fn num_lifetime_params(&self) -> usize { | |
392 | self.args.iter().filter(|arg| matches!(arg, GenericArg::Lifetime(_))).count() | |
393 | } | |
dfeec247 | 394 | |
94222f64 XL |
395 | #[inline] |
396 | pub fn has_lifetime_params(&self) -> bool { | |
397 | self.args.iter().any(|arg| matches!(arg, GenericArg::Lifetime(_))) | |
398 | } | |
399 | ||
400 | #[inline] | |
401 | pub fn num_generic_params(&self) -> usize { | |
402 | self.args.iter().filter(|arg| !matches!(arg, GenericArg::Lifetime(_))).count() | |
dfeec247 | 403 | } |
5869c6ff | 404 | |
17df50a5 XL |
405 | /// The span encompassing the text inside the surrounding brackets. |
406 | /// It will also include bindings if they aren't in the form `-> Ret` | |
407 | /// Returns `None` if the span is empty (e.g. no brackets) or dummy | |
5869c6ff | 408 | pub fn span(&self) -> Option<Span> { |
17df50a5 XL |
409 | let span_ext = self.span_ext()?; |
410 | Some(span_ext.with_lo(span_ext.lo() + BytePos(1)).with_hi(span_ext.hi() - BytePos(1))) | |
5869c6ff XL |
411 | } |
412 | ||
413 | /// Returns span encompassing arguments and their surrounding `<>` or `()` | |
17df50a5 XL |
414 | pub fn span_ext(&self) -> Option<Span> { |
415 | Some(self.span_ext).filter(|span| !span.is_empty()) | |
5869c6ff XL |
416 | } |
417 | ||
418 | pub fn is_empty(&self) -> bool { | |
419 | self.args.is_empty() | |
420 | } | |
dfeec247 XL |
421 | } |
422 | ||
423 | /// A modifier on a bound, currently this is only used for `?Sized`, where the | |
424 | /// modifier is `Maybe`. Negative bounds should also be handled here. | |
3dfed10e | 425 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Hash, Debug)] |
dfeec247 XL |
426 | #[derive(HashStable_Generic)] |
427 | pub enum TraitBoundModifier { | |
428 | None, | |
429 | Maybe, | |
430 | MaybeConst, | |
431 | } | |
432 | ||
433 | /// The AST represents all type param bounds as types. | |
434 | /// `typeck::collect::compute_bounds` matches these against | |
435 | /// the "special" built-in traits (see `middle::lang_items`) and | |
436 | /// detects `Copy`, `Send` and `Sync`. | |
cdc7bbd5 | 437 | #[derive(Clone, Debug, HashStable_Generic)] |
dfeec247 XL |
438 | pub enum GenericBound<'hir> { |
439 | Trait(PolyTraitRef<'hir>, TraitBoundModifier), | |
3dfed10e XL |
440 | // FIXME(davidtwco): Introduce `PolyTraitRef::LangItem` |
441 | LangItemTrait(LangItem, Span, HirId, &'hir GenericArgs<'hir>), | |
dfeec247 XL |
442 | Outlives(Lifetime), |
443 | } | |
444 | ||
c295e0f8 XL |
445 | #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))] |
446 | rustc_data_structures::static_assert_size!(GenericBound<'_>, 48); | |
447 | ||
dfeec247 | 448 | impl GenericBound<'_> { |
ba9703b0 | 449 | pub fn trait_ref(&self) -> Option<&TraitRef<'_>> { |
dfeec247 | 450 | match self { |
ba9703b0 | 451 | GenericBound::Trait(data, _) => Some(&data.trait_ref), |
dfeec247 XL |
452 | _ => None, |
453 | } | |
454 | } | |
455 | ||
456 | pub fn span(&self) -> Span { | |
457 | match self { | |
5869c6ff XL |
458 | GenericBound::Trait(t, ..) => t.span, |
459 | GenericBound::LangItemTrait(_, span, ..) => *span, | |
460 | GenericBound::Outlives(l) => l.span, | |
dfeec247 XL |
461 | } |
462 | } | |
463 | } | |
464 | ||
465 | pub type GenericBounds<'hir> = &'hir [GenericBound<'hir>]; | |
466 | ||
3dfed10e | 467 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
468 | pub enum LifetimeParamKind { |
469 | // Indicates that the lifetime definition was explicitly declared (e.g., in | |
470 | // `fn foo<'a>(x: &'a u8) -> &'a u8 { x }`). | |
471 | Explicit, | |
472 | ||
473 | // Indicates that the lifetime definition was synthetically added | |
474 | // as a result of an in-band lifetime usage (e.g., in | |
475 | // `fn foo(x: &'a u8) -> &'a u8 { x }`). | |
476 | InBand, | |
477 | ||
478 | // Indication that the lifetime was elided (e.g., in both cases in | |
479 | // `fn foo(x: &u8) -> &'_ u8 { x }`). | |
480 | Elided, | |
481 | ||
482 | // Indication that the lifetime name was somehow in error. | |
483 | Error, | |
484 | } | |
485 | ||
3dfed10e | 486 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
487 | pub enum GenericParamKind<'hir> { |
488 | /// A lifetime definition (e.g., `'a: 'b + 'c + 'd`). | |
489 | Lifetime { | |
490 | kind: LifetimeParamKind, | |
491 | }, | |
492 | Type { | |
493 | default: Option<&'hir Ty<'hir>>, | |
3c0e092e | 494 | synthetic: bool, |
dfeec247 XL |
495 | }, |
496 | Const { | |
497 | ty: &'hir Ty<'hir>, | |
5869c6ff XL |
498 | /// Optional default value for the const generic param |
499 | default: Option<AnonConst>, | |
dfeec247 XL |
500 | }, |
501 | } | |
502 | ||
3dfed10e | 503 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
504 | pub struct GenericParam<'hir> { |
505 | pub hir_id: HirId, | |
506 | pub name: ParamName, | |
dfeec247 XL |
507 | pub bounds: GenericBounds<'hir>, |
508 | pub span: Span, | |
509 | pub pure_wrt_drop: bool, | |
510 | pub kind: GenericParamKind<'hir>, | |
511 | } | |
512 | ||
a2a8927a XL |
513 | impl<'hir> GenericParam<'hir> { |
514 | pub fn bounds_span_for_suggestions(&self) -> Option<Span> { | |
515 | self.bounds | |
516 | .iter() | |
517 | .fold(None, |span: Option<Span>, bound| { | |
518 | // We include bounds that come from a `#[derive(_)]` but point at the user's code, | |
519 | // as we use this method to get a span appropriate for suggestions. | |
520 | if !bound.span().can_be_used_for_suggestions() { | |
521 | None | |
522 | } else { | |
523 | let span = span.map(|s| s.to(bound.span())).unwrap_or_else(|| bound.span()); | |
524 | Some(span) | |
525 | } | |
526 | }) | |
527 | .map(|sp| sp.shrink_to_hi()) | |
74b04a01 XL |
528 | } |
529 | } | |
530 | ||
dfeec247 XL |
531 | #[derive(Default)] |
532 | pub struct GenericParamCount { | |
533 | pub lifetimes: usize, | |
534 | pub types: usize, | |
535 | pub consts: usize, | |
94222f64 | 536 | pub infer: usize, |
dfeec247 XL |
537 | } |
538 | ||
539 | /// Represents lifetimes and type parameters attached to a declaration | |
540 | /// of a function, enum, trait, etc. | |
3dfed10e | 541 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
542 | pub struct Generics<'hir> { |
543 | pub params: &'hir [GenericParam<'hir>], | |
544 | pub where_clause: WhereClause<'hir>, | |
545 | pub span: Span, | |
546 | } | |
547 | ||
a2a8927a | 548 | impl<'hir> Generics<'hir> { |
dfeec247 XL |
549 | pub const fn empty() -> Generics<'hir> { |
550 | Generics { | |
551 | params: &[], | |
552 | where_clause: WhereClause { predicates: &[], span: DUMMY_SP }, | |
553 | span: DUMMY_SP, | |
554 | } | |
555 | } | |
556 | ||
dfeec247 XL |
557 | pub fn get_named(&self, name: Symbol) -> Option<&GenericParam<'_>> { |
558 | for param in self.params { | |
559 | if name == param.name.ident().name { | |
560 | return Some(param); | |
561 | } | |
562 | } | |
563 | None | |
564 | } | |
565 | ||
566 | pub fn spans(&self) -> MultiSpan { | |
567 | if self.params.is_empty() { | |
568 | self.span.into() | |
569 | } else { | |
570 | self.params.iter().map(|p| p.span).collect::<Vec<Span>>().into() | |
571 | } | |
572 | } | |
573 | } | |
574 | ||
dfeec247 | 575 | /// A where-clause in a definition. |
3dfed10e | 576 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
577 | pub struct WhereClause<'hir> { |
578 | pub predicates: &'hir [WherePredicate<'hir>], | |
74b04a01 | 579 | // Only valid if predicates aren't empty. |
dfeec247 XL |
580 | pub span: Span, |
581 | } | |
582 | ||
583 | impl WhereClause<'_> { | |
584 | pub fn span(&self) -> Option<Span> { | |
585 | if self.predicates.is_empty() { None } else { Some(self.span) } | |
586 | } | |
587 | ||
588 | /// The `WhereClause` under normal circumstances points at either the predicates or the empty | |
589 | /// space where the `where` clause should be. Only of use for diagnostic suggestions. | |
590 | pub fn span_for_predicates_or_empty_place(&self) -> Span { | |
591 | self.span | |
592 | } | |
f9f354fc XL |
593 | |
594 | /// `Span` where further predicates would be suggested, accounting for trailing commas, like | |
595 | /// in `fn foo<T>(t: T) where T: Foo,` so we don't suggest two trailing commas. | |
596 | pub fn tail_span_for_suggestion(&self) -> Span { | |
597 | let end = self.span_for_predicates_or_empty_place().shrink_to_hi(); | |
5869c6ff | 598 | self.predicates.last().map_or(end, |p| p.span()).shrink_to_hi().to(end) |
f9f354fc | 599 | } |
dfeec247 XL |
600 | } |
601 | ||
602 | /// A single predicate in a where-clause. | |
3dfed10e | 603 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
604 | pub enum WherePredicate<'hir> { |
605 | /// A type binding (e.g., `for<'c> Foo: Send + Clone + 'c`). | |
606 | BoundPredicate(WhereBoundPredicate<'hir>), | |
607 | /// A lifetime predicate (e.g., `'a: 'b + 'c`). | |
608 | RegionPredicate(WhereRegionPredicate<'hir>), | |
609 | /// An equality predicate (unsupported). | |
610 | EqPredicate(WhereEqPredicate<'hir>), | |
611 | } | |
612 | ||
a2a8927a | 613 | impl<'hir> WherePredicate<'hir> { |
dfeec247 XL |
614 | pub fn span(&self) -> Span { |
615 | match self { | |
5869c6ff XL |
616 | WherePredicate::BoundPredicate(p) => p.span, |
617 | WherePredicate::RegionPredicate(p) => p.span, | |
618 | WherePredicate::EqPredicate(p) => p.span, | |
dfeec247 XL |
619 | } |
620 | } | |
621 | } | |
622 | ||
623 | /// A type bound (e.g., `for<'c> Foo: Send + Clone + 'c`). | |
3dfed10e | 624 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
625 | pub struct WhereBoundPredicate<'hir> { |
626 | pub span: Span, | |
627 | /// Any generics from a `for` binding. | |
628 | pub bound_generic_params: &'hir [GenericParam<'hir>], | |
629 | /// The type being bounded. | |
630 | pub bounded_ty: &'hir Ty<'hir>, | |
631 | /// Trait and lifetime bounds (e.g., `Clone + Send + 'static`). | |
632 | pub bounds: GenericBounds<'hir>, | |
633 | } | |
634 | ||
a2a8927a | 635 | impl<'hir> WhereBoundPredicate<'hir> { |
3c0e092e XL |
636 | /// Returns `true` if `param_def_id` matches the `bounded_ty` of this predicate. |
637 | pub fn is_param_bound(&self, param_def_id: DefId) -> bool { | |
638 | let path = match self.bounded_ty.kind { | |
639 | TyKind::Path(QPath::Resolved(None, path)) => path, | |
640 | _ => return false, | |
641 | }; | |
642 | match path.res { | |
5099ac24 FG |
643 | Res::Def(DefKind::TyParam, def_id) |
644 | | Res::SelfTy { trait_: Some(def_id), alias_to: None } => def_id == param_def_id, | |
3c0e092e XL |
645 | _ => false, |
646 | } | |
647 | } | |
648 | } | |
649 | ||
dfeec247 | 650 | /// A lifetime predicate (e.g., `'a: 'b + 'c`). |
3dfed10e | 651 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
652 | pub struct WhereRegionPredicate<'hir> { |
653 | pub span: Span, | |
654 | pub lifetime: Lifetime, | |
655 | pub bounds: GenericBounds<'hir>, | |
656 | } | |
657 | ||
658 | /// An equality predicate (e.g., `T = int`); currently unsupported. | |
3dfed10e | 659 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
660 | pub struct WhereEqPredicate<'hir> { |
661 | pub hir_id: HirId, | |
662 | pub span: Span, | |
663 | pub lhs_ty: &'hir Ty<'hir>, | |
664 | pub rhs_ty: &'hir Ty<'hir>, | |
665 | } | |
666 | ||
3c0e092e | 667 | /// HIR node coupled with its parent's id in the same HIR owner. |
dfeec247 | 668 | /// |
3c0e092e XL |
669 | /// The parent is trash when the node is a HIR owner. |
670 | #[derive(Clone, Debug)] | |
671 | pub struct ParentedNode<'tcx> { | |
672 | pub parent: ItemLocalId, | |
673 | pub node: Node<'tcx>, | |
dfeec247 XL |
674 | } |
675 | ||
3c0e092e XL |
676 | /// Attributes owned by a HIR owner. |
677 | #[derive(Debug)] | |
678 | pub struct AttributeMap<'tcx> { | |
679 | pub map: SortedMap<ItemLocalId, &'tcx [Attribute]>, | |
680 | pub hash: Fingerprint, | |
681 | } | |
dfeec247 | 682 | |
3c0e092e XL |
683 | impl<'tcx> AttributeMap<'tcx> { |
684 | pub const EMPTY: &'static AttributeMap<'static> = | |
685 | &AttributeMap { map: SortedMap::new(), hash: Fingerprint::ZERO }; | |
dfeec247 | 686 | |
3c0e092e XL |
687 | #[inline] |
688 | pub fn get(&self, id: ItemLocalId) -> &'tcx [Attribute] { | |
689 | self.map.get(&id).copied().unwrap_or(&[]) | |
dfeec247 | 690 | } |
3c0e092e | 691 | } |
dfeec247 | 692 | |
3c0e092e XL |
693 | /// Map of all HIR nodes inside the current owner. |
694 | /// These nodes are mapped by `ItemLocalId` alongside the index of their parent node. | |
695 | /// The HIR tree, including bodies, is pre-hashed. | |
696 | #[derive(Debug)] | |
697 | pub struct OwnerNodes<'tcx> { | |
698 | /// Pre-computed hash of the full HIR. | |
699 | pub hash_including_bodies: Fingerprint, | |
700 | /// Pre-computed hash of the item signature, sithout recursing into the body. | |
701 | pub hash_without_bodies: Fingerprint, | |
702 | /// Full HIR for the current owner. | |
703 | // The zeroth node's parent should never be accessed: the owner's parent is computed by the | |
704 | // hir_owner_parent query. It is set to `ItemLocalId::INVALID` to force an ICE if accidentally | |
705 | // used. | |
706 | pub nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>, | |
707 | /// Content of local bodies. | |
708 | pub bodies: SortedMap<ItemLocalId, &'tcx Body<'tcx>>, | |
5099ac24 FG |
709 | /// Non-owning definitions contained in this owner. |
710 | pub local_id_to_def_id: SortedMap<ItemLocalId, LocalDefId>, | |
711 | } | |
712 | ||
713 | impl<'tcx> OwnerNodes<'tcx> { | |
714 | pub fn node(&self) -> OwnerNode<'tcx> { | |
715 | use rustc_index::vec::Idx; | |
716 | let node = self.nodes[ItemLocalId::new(0)].as_ref().unwrap().node; | |
717 | let node = node.as_owner().unwrap(); // Indexing must ensure it is an OwnerNode. | |
718 | node | |
719 | } | |
3c0e092e XL |
720 | } |
721 | ||
722 | /// Full information resulting from lowering an AST node. | |
723 | #[derive(Debug, HashStable_Generic)] | |
724 | pub struct OwnerInfo<'hir> { | |
725 | /// Contents of the HIR. | |
726 | pub nodes: OwnerNodes<'hir>, | |
727 | /// Map from each nested owner to its parent's local id. | |
728 | pub parenting: FxHashMap<LocalDefId, ItemLocalId>, | |
729 | /// Collected attributes of the HIR nodes. | |
730 | pub attrs: AttributeMap<'hir>, | |
731 | /// Map indicating what traits are in scope for places where this | |
732 | /// is relevant; generated by resolve. | |
733 | pub trait_map: FxHashMap<ItemLocalId, Box<[TraitCandidate]>>, | |
734 | } | |
94222f64 | 735 | |
3c0e092e XL |
736 | impl<'tcx> OwnerInfo<'tcx> { |
737 | #[inline] | |
738 | pub fn node(&self) -> OwnerNode<'tcx> { | |
5099ac24 FG |
739 | self.nodes.node() |
740 | } | |
741 | } | |
742 | ||
743 | #[derive(Copy, Clone, Debug, HashStable_Generic)] | |
744 | pub enum MaybeOwner<T> { | |
745 | Owner(T), | |
746 | NonOwner(HirId), | |
747 | /// Used as a placeholder for unused LocalDefId. | |
748 | Phantom, | |
749 | } | |
750 | ||
751 | impl<T> MaybeOwner<T> { | |
752 | pub fn as_owner(self) -> Option<T> { | |
753 | match self { | |
754 | MaybeOwner::Owner(i) => Some(i), | |
755 | MaybeOwner::NonOwner(_) | MaybeOwner::Phantom => None, | |
756 | } | |
757 | } | |
758 | ||
759 | pub fn map<U>(self, f: impl FnOnce(T) -> U) -> MaybeOwner<U> { | |
760 | match self { | |
761 | MaybeOwner::Owner(i) => MaybeOwner::Owner(f(i)), | |
762 | MaybeOwner::NonOwner(hir_id) => MaybeOwner::NonOwner(hir_id), | |
763 | MaybeOwner::Phantom => MaybeOwner::Phantom, | |
764 | } | |
765 | } | |
766 | ||
767 | pub fn unwrap(self) -> T { | |
768 | match self { | |
769 | MaybeOwner::Owner(i) => i, | |
770 | MaybeOwner::NonOwner(_) | MaybeOwner::Phantom => panic!("Not a HIR owner"), | |
771 | } | |
fc512014 | 772 | } |
3c0e092e | 773 | } |
fc512014 | 774 | |
3c0e092e XL |
775 | /// The top-level data structure that stores the entire contents of |
776 | /// the crate currently being compiled. | |
777 | /// | |
778 | /// For more details, see the [rustc dev guide]. | |
779 | /// | |
780 | /// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/hir.html | |
781 | #[derive(Debug)] | |
782 | pub struct Crate<'hir> { | |
5099ac24 | 783 | pub owners: IndexVec<LocalDefId, MaybeOwner<&'hir OwnerInfo<'hir>>>, |
3c0e092e | 784 | pub hir_hash: Fingerprint, |
dfeec247 XL |
785 | } |
786 | ||
dfeec247 XL |
787 | /// A block of statements `{ .. }`, which may have a label (in this case the |
788 | /// `targeted_by_break` field will be `true`) and may be `unsafe` by means of | |
789 | /// the `rules` being anything but `DefaultBlock`. | |
3dfed10e | 790 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
791 | pub struct Block<'hir> { |
792 | /// Statements in a block. | |
793 | pub stmts: &'hir [Stmt<'hir>], | |
794 | /// An expression at the end of the block | |
795 | /// without a semicolon, if any. | |
796 | pub expr: Option<&'hir Expr<'hir>>, | |
797 | #[stable_hasher(ignore)] | |
798 | pub hir_id: HirId, | |
799 | /// Distinguishes between `unsafe { ... }` and `{ ... }`. | |
800 | pub rules: BlockCheckMode, | |
801 | pub span: Span, | |
802 | /// If true, then there may exist `break 'a` values that aim to | |
803 | /// break out of this block early. | |
804 | /// Used by `'label: {}` blocks and by `try {}` blocks. | |
805 | pub targeted_by_break: bool, | |
806 | } | |
807 | ||
3dfed10e | 808 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
809 | pub struct Pat<'hir> { |
810 | #[stable_hasher(ignore)] | |
811 | pub hir_id: HirId, | |
812 | pub kind: PatKind<'hir>, | |
813 | pub span: Span, | |
29967ef6 XL |
814 | // Whether to use default binding modes. |
815 | // At present, this is false only for destructuring assignment. | |
816 | pub default_binding_modes: bool, | |
dfeec247 XL |
817 | } |
818 | ||
5869c6ff | 819 | impl<'hir> Pat<'hir> { |
dfeec247 | 820 | // FIXME(#19596) this is a workaround, but there should be a better way |
5869c6ff | 821 | fn walk_short_(&self, it: &mut impl FnMut(&Pat<'hir>) -> bool) -> bool { |
dfeec247 XL |
822 | if !it(self) { |
823 | return false; | |
824 | } | |
825 | ||
826 | use PatKind::*; | |
136023e0 | 827 | match self.kind { |
dfeec247 XL |
828 | Wild | Lit(_) | Range(..) | Binding(.., None) | Path(_) => true, |
829 | Box(s) | Ref(s, _) | Binding(.., Some(s)) => s.walk_short_(it), | |
830 | Struct(_, fields, _) => fields.iter().all(|field| field.pat.walk_short_(it)), | |
831 | TupleStruct(_, s, _) | Tuple(s, _) | Or(s) => s.iter().all(|p| p.walk_short_(it)), | |
832 | Slice(before, slice, after) => { | |
136023e0 | 833 | before.iter().chain(slice).chain(after.iter()).all(|p| p.walk_short_(it)) |
dfeec247 XL |
834 | } |
835 | } | |
836 | } | |
837 | ||
838 | /// Walk the pattern in left-to-right order, | |
839 | /// short circuiting (with `.all(..)`) if `false` is returned. | |
840 | /// | |
841 | /// Note that when visiting e.g. `Tuple(ps)`, | |
842 | /// if visiting `ps[0]` returns `false`, | |
843 | /// then `ps[1]` will not be visited. | |
5869c6ff | 844 | pub fn walk_short(&self, mut it: impl FnMut(&Pat<'hir>) -> bool) -> bool { |
dfeec247 XL |
845 | self.walk_short_(&mut it) |
846 | } | |
847 | ||
848 | // FIXME(#19596) this is a workaround, but there should be a better way | |
5869c6ff | 849 | fn walk_(&self, it: &mut impl FnMut(&Pat<'hir>) -> bool) { |
dfeec247 XL |
850 | if !it(self) { |
851 | return; | |
852 | } | |
853 | ||
854 | use PatKind::*; | |
136023e0 | 855 | match self.kind { |
dfeec247 XL |
856 | Wild | Lit(_) | Range(..) | Binding(.., None) | Path(_) => {} |
857 | Box(s) | Ref(s, _) | Binding(.., Some(s)) => s.walk_(it), | |
858 | Struct(_, fields, _) => fields.iter().for_each(|field| field.pat.walk_(it)), | |
859 | TupleStruct(_, s, _) | Tuple(s, _) | Or(s) => s.iter().for_each(|p| p.walk_(it)), | |
860 | Slice(before, slice, after) => { | |
136023e0 | 861 | before.iter().chain(slice).chain(after.iter()).for_each(|p| p.walk_(it)) |
dfeec247 XL |
862 | } |
863 | } | |
864 | } | |
865 | ||
866 | /// Walk the pattern in left-to-right order. | |
867 | /// | |
868 | /// If `it(pat)` returns `false`, the children are not visited. | |
5869c6ff | 869 | pub fn walk(&self, mut it: impl FnMut(&Pat<'hir>) -> bool) { |
dfeec247 XL |
870 | self.walk_(&mut it) |
871 | } | |
872 | ||
873 | /// Walk the pattern in left-to-right order. | |
874 | /// | |
875 | /// If you always want to recurse, prefer this method over `walk`. | |
876 | pub fn walk_always(&self, mut it: impl FnMut(&Pat<'_>)) { | |
877 | self.walk(|p| { | |
878 | it(p); | |
879 | true | |
880 | }) | |
881 | } | |
882 | } | |
883 | ||
884 | /// A single field in a struct pattern. | |
885 | /// | |
886 | /// Patterns like the fields of Foo `{ x, ref y, ref mut z }` | |
887 | /// are treated the same as` x: x, y: ref y, z: ref mut z`, | |
888 | /// except `is_shorthand` is true. | |
3dfed10e | 889 | #[derive(Debug, HashStable_Generic)] |
6a06907d | 890 | pub struct PatField<'hir> { |
dfeec247 XL |
891 | #[stable_hasher(ignore)] |
892 | pub hir_id: HirId, | |
893 | /// The identifier for the field. | |
dfeec247 XL |
894 | pub ident: Ident, |
895 | /// The pattern the field is destructured to. | |
896 | pub pat: &'hir Pat<'hir>, | |
897 | pub is_shorthand: bool, | |
898 | pub span: Span, | |
899 | } | |
900 | ||
901 | /// Explicit binding annotations given in the HIR for a binding. Note | |
902 | /// that this is not the final binding *mode* that we infer after type | |
903 | /// inference. | |
3dfed10e | 904 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
905 | pub enum BindingAnnotation { |
906 | /// No binding annotation given: this means that the final binding mode | |
907 | /// will depend on whether we have skipped through a `&` reference | |
908 | /// when matching. For example, the `x` in `Some(x)` will have binding | |
909 | /// mode `None`; if you do `let Some(x) = &Some(22)`, it will | |
910 | /// ultimately be inferred to be by-reference. | |
911 | /// | |
912 | /// Note that implicit reference skipping is not implemented yet (#42640). | |
913 | Unannotated, | |
914 | ||
915 | /// Annotated with `mut x` -- could be either ref or not, similar to `None`. | |
916 | Mutable, | |
917 | ||
918 | /// Annotated as `ref`, like `ref x` | |
919 | Ref, | |
920 | ||
921 | /// Annotated as `ref mut x`. | |
922 | RefMut, | |
923 | } | |
924 | ||
3dfed10e | 925 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
926 | pub enum RangeEnd { |
927 | Included, | |
928 | Excluded, | |
929 | } | |
930 | ||
931 | impl fmt::Display for RangeEnd { | |
932 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
933 | f.write_str(match self { | |
934 | RangeEnd::Included => "..=", | |
935 | RangeEnd::Excluded => "..", | |
936 | }) | |
937 | } | |
938 | } | |
939 | ||
3dfed10e | 940 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
941 | pub enum PatKind<'hir> { |
942 | /// Represents a wildcard pattern (i.e., `_`). | |
943 | Wild, | |
944 | ||
945 | /// A fresh binding `ref mut binding @ OPT_SUBPATTERN`. | |
946 | /// The `HirId` is the canonical ID for the variable being bound, | |
947 | /// (e.g., in `Ok(x) | Err(x)`, both `x` use the same canonical ID), | |
948 | /// which is the pattern ID of the first `x`. | |
949 | Binding(BindingAnnotation, HirId, Ident, Option<&'hir Pat<'hir>>), | |
950 | ||
951 | /// A struct or struct variant pattern (e.g., `Variant {x, y, ..}`). | |
952 | /// The `bool` is `true` in the presence of a `..`. | |
6a06907d | 953 | Struct(QPath<'hir>, &'hir [PatField<'hir>], bool), |
dfeec247 XL |
954 | |
955 | /// A tuple struct/variant pattern `Variant(x, y, .., z)`. | |
956 | /// If the `..` pattern fragment is present, then `Option<usize>` denotes its position. | |
957 | /// `0 <= position <= subpats.len()` | |
136023e0 | 958 | TupleStruct(QPath<'hir>, &'hir [Pat<'hir>], Option<usize>), |
dfeec247 XL |
959 | |
960 | /// An or-pattern `A | B | C`. | |
961 | /// Invariant: `pats.len() >= 2`. | |
136023e0 | 962 | Or(&'hir [Pat<'hir>]), |
dfeec247 | 963 | |
94222f64 | 964 | /// A path pattern for a unit struct/variant or a (maybe-associated) constant. |
dfeec247 XL |
965 | Path(QPath<'hir>), |
966 | ||
967 | /// A tuple pattern (e.g., `(a, b)`). | |
968 | /// If the `..` pattern fragment is present, then `Option<usize>` denotes its position. | |
969 | /// `0 <= position <= subpats.len()` | |
136023e0 | 970 | Tuple(&'hir [Pat<'hir>], Option<usize>), |
dfeec247 XL |
971 | |
972 | /// A `box` pattern. | |
973 | Box(&'hir Pat<'hir>), | |
974 | ||
975 | /// A reference pattern (e.g., `&mut (a, b)`). | |
976 | Ref(&'hir Pat<'hir>, Mutability), | |
977 | ||
978 | /// A literal. | |
979 | Lit(&'hir Expr<'hir>), | |
980 | ||
981 | /// A range pattern (e.g., `1..=2` or `1..2`). | |
982 | Range(Option<&'hir Expr<'hir>>, Option<&'hir Expr<'hir>>, RangeEnd), | |
983 | ||
984 | /// A slice pattern, `[before_0, ..., before_n, (slice, after_0, ..., after_n)?]`. | |
985 | /// | |
986 | /// Here, `slice` is lowered from the syntax `($binding_mode $ident @)? ..`. | |
987 | /// If `slice` exists, then `after` can be non-empty. | |
988 | /// | |
989 | /// The representation for e.g., `[a, b, .., c, d]` is: | |
990 | /// ``` | |
991 | /// PatKind::Slice([Binding(a), Binding(b)], Some(Wild), [Binding(c), Binding(d)]) | |
992 | /// ``` | |
136023e0 | 993 | Slice(&'hir [Pat<'hir>], Option<&'hir Pat<'hir>>, &'hir [Pat<'hir>]), |
dfeec247 XL |
994 | } |
995 | ||
3dfed10e | 996 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
997 | pub enum BinOpKind { |
998 | /// The `+` operator (addition). | |
999 | Add, | |
1000 | /// The `-` operator (subtraction). | |
1001 | Sub, | |
1002 | /// The `*` operator (multiplication). | |
1003 | Mul, | |
1004 | /// The `/` operator (division). | |
1005 | Div, | |
1006 | /// The `%` operator (modulus). | |
1007 | Rem, | |
1008 | /// The `&&` operator (logical and). | |
1009 | And, | |
1010 | /// The `||` operator (logical or). | |
1011 | Or, | |
1012 | /// The `^` operator (bitwise xor). | |
1013 | BitXor, | |
1014 | /// The `&` operator (bitwise and). | |
1015 | BitAnd, | |
1016 | /// The `|` operator (bitwise or). | |
1017 | BitOr, | |
1018 | /// The `<<` operator (shift left). | |
1019 | Shl, | |
1020 | /// The `>>` operator (shift right). | |
1021 | Shr, | |
1022 | /// The `==` operator (equality). | |
1023 | Eq, | |
1024 | /// The `<` operator (less than). | |
1025 | Lt, | |
1026 | /// The `<=` operator (less than or equal to). | |
1027 | Le, | |
1028 | /// The `!=` operator (not equal to). | |
1029 | Ne, | |
1030 | /// The `>=` operator (greater than or equal to). | |
1031 | Ge, | |
1032 | /// The `>` operator (greater than). | |
1033 | Gt, | |
1034 | } | |
1035 | ||
1036 | impl BinOpKind { | |
1037 | pub fn as_str(self) -> &'static str { | |
1038 | match self { | |
1039 | BinOpKind::Add => "+", | |
1040 | BinOpKind::Sub => "-", | |
1041 | BinOpKind::Mul => "*", | |
1042 | BinOpKind::Div => "/", | |
1043 | BinOpKind::Rem => "%", | |
1044 | BinOpKind::And => "&&", | |
1045 | BinOpKind::Or => "||", | |
1046 | BinOpKind::BitXor => "^", | |
1047 | BinOpKind::BitAnd => "&", | |
1048 | BinOpKind::BitOr => "|", | |
1049 | BinOpKind::Shl => "<<", | |
1050 | BinOpKind::Shr => ">>", | |
1051 | BinOpKind::Eq => "==", | |
1052 | BinOpKind::Lt => "<", | |
1053 | BinOpKind::Le => "<=", | |
1054 | BinOpKind::Ne => "!=", | |
1055 | BinOpKind::Ge => ">=", | |
1056 | BinOpKind::Gt => ">", | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | pub fn is_lazy(self) -> bool { | |
29967ef6 | 1061 | matches!(self, BinOpKind::And | BinOpKind::Or) |
dfeec247 XL |
1062 | } |
1063 | ||
1064 | pub fn is_shift(self) -> bool { | |
29967ef6 | 1065 | matches!(self, BinOpKind::Shl | BinOpKind::Shr) |
dfeec247 XL |
1066 | } |
1067 | ||
1068 | pub fn is_comparison(self) -> bool { | |
1069 | match self { | |
1070 | BinOpKind::Eq | |
1071 | | BinOpKind::Lt | |
1072 | | BinOpKind::Le | |
1073 | | BinOpKind::Ne | |
1074 | | BinOpKind::Gt | |
1075 | | BinOpKind::Ge => true, | |
1076 | BinOpKind::And | |
1077 | | BinOpKind::Or | |
1078 | | BinOpKind::Add | |
1079 | | BinOpKind::Sub | |
1080 | | BinOpKind::Mul | |
1081 | | BinOpKind::Div | |
1082 | | BinOpKind::Rem | |
1083 | | BinOpKind::BitXor | |
1084 | | BinOpKind::BitAnd | |
1085 | | BinOpKind::BitOr | |
1086 | | BinOpKind::Shl | |
1087 | | BinOpKind::Shr => false, | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | /// Returns `true` if the binary operator takes its arguments by value. | |
1092 | pub fn is_by_value(self) -> bool { | |
1093 | !self.is_comparison() | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | impl Into<ast::BinOpKind> for BinOpKind { | |
1098 | fn into(self) -> ast::BinOpKind { | |
1099 | match self { | |
1100 | BinOpKind::Add => ast::BinOpKind::Add, | |
1101 | BinOpKind::Sub => ast::BinOpKind::Sub, | |
1102 | BinOpKind::Mul => ast::BinOpKind::Mul, | |
1103 | BinOpKind::Div => ast::BinOpKind::Div, | |
1104 | BinOpKind::Rem => ast::BinOpKind::Rem, | |
1105 | BinOpKind::And => ast::BinOpKind::And, | |
1106 | BinOpKind::Or => ast::BinOpKind::Or, | |
1107 | BinOpKind::BitXor => ast::BinOpKind::BitXor, | |
1108 | BinOpKind::BitAnd => ast::BinOpKind::BitAnd, | |
1109 | BinOpKind::BitOr => ast::BinOpKind::BitOr, | |
1110 | BinOpKind::Shl => ast::BinOpKind::Shl, | |
1111 | BinOpKind::Shr => ast::BinOpKind::Shr, | |
1112 | BinOpKind::Eq => ast::BinOpKind::Eq, | |
1113 | BinOpKind::Lt => ast::BinOpKind::Lt, | |
1114 | BinOpKind::Le => ast::BinOpKind::Le, | |
1115 | BinOpKind::Ne => ast::BinOpKind::Ne, | |
1116 | BinOpKind::Ge => ast::BinOpKind::Ge, | |
1117 | BinOpKind::Gt => ast::BinOpKind::Gt, | |
1118 | } | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | pub type BinOp = Spanned<BinOpKind>; | |
1123 | ||
3dfed10e | 1124 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
1125 | pub enum UnOp { |
1126 | /// The `*` operator (deferencing). | |
6a06907d | 1127 | Deref, |
dfeec247 | 1128 | /// The `!` operator (logical negation). |
6a06907d | 1129 | Not, |
dfeec247 | 1130 | /// The `-` operator (negation). |
6a06907d | 1131 | Neg, |
dfeec247 XL |
1132 | } |
1133 | ||
1134 | impl UnOp { | |
1135 | pub fn as_str(self) -> &'static str { | |
1136 | match self { | |
6a06907d XL |
1137 | Self::Deref => "*", |
1138 | Self::Not => "!", | |
1139 | Self::Neg => "-", | |
dfeec247 XL |
1140 | } |
1141 | } | |
1142 | ||
1143 | /// Returns `true` if the unary operator takes its argument by value. | |
1144 | pub fn is_by_value(self) -> bool { | |
6a06907d | 1145 | matches!(self, Self::Neg | Self::Not) |
dfeec247 XL |
1146 | } |
1147 | } | |
1148 | ||
1149 | /// A statement. | |
3dfed10e | 1150 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
1151 | pub struct Stmt<'hir> { |
1152 | pub hir_id: HirId, | |
1153 | pub kind: StmtKind<'hir>, | |
1154 | pub span: Span, | |
1155 | } | |
1156 | ||
dfeec247 | 1157 | /// The contents of a statement. |
3dfed10e | 1158 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
1159 | pub enum StmtKind<'hir> { |
1160 | /// A local (`let`) binding. | |
1161 | Local(&'hir Local<'hir>), | |
1162 | ||
1163 | /// An item binding. | |
1164 | Item(ItemId), | |
1165 | ||
1166 | /// An expression without a trailing semi-colon (must have unit type). | |
1167 | Expr(&'hir Expr<'hir>), | |
1168 | ||
1169 | /// An expression with a trailing semi-colon (may have any type). | |
1170 | Semi(&'hir Expr<'hir>), | |
1171 | } | |
1172 | ||
dfeec247 | 1173 | /// Represents a `let` statement (i.e., `let <pat>:<ty> = <expr>;`). |
3dfed10e | 1174 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
1175 | pub struct Local<'hir> { |
1176 | pub pat: &'hir Pat<'hir>, | |
1177 | /// Type annotation, if any (otherwise the type will be inferred). | |
1178 | pub ty: Option<&'hir Ty<'hir>>, | |
1179 | /// Initializer expression to set the value, if any. | |
1180 | pub init: Option<&'hir Expr<'hir>>, | |
1181 | pub hir_id: HirId, | |
1182 | pub span: Span, | |
dfeec247 XL |
1183 | /// Can be `ForLoopDesugar` if the `let` statement is part of a `for` loop |
1184 | /// desugaring. Otherwise will be `Normal`. | |
1185 | pub source: LocalSource, | |
1186 | } | |
1187 | ||
1188 | /// Represents a single arm of a `match` expression, e.g. | |
1189 | /// `<pat> (if <guard>) => <body>`. | |
3dfed10e | 1190 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
1191 | pub struct Arm<'hir> { |
1192 | #[stable_hasher(ignore)] | |
1193 | pub hir_id: HirId, | |
1194 | pub span: Span, | |
dfeec247 XL |
1195 | /// If this pattern and the optional guard matches, then `body` is evaluated. |
1196 | pub pat: &'hir Pat<'hir>, | |
1197 | /// Optional guard clause. | |
1198 | pub guard: Option<Guard<'hir>>, | |
1199 | /// The expression the arm evaluates to if this arm matches. | |
1200 | pub body: &'hir Expr<'hir>, | |
1201 | } | |
1202 | ||
a2a8927a XL |
1203 | /// Represents a `let <pat>[: <ty>] = <expr>` expression (not a Local), occurring in an `if-let` or |
1204 | /// `let-else`, evaluating to a boolean. Typically the pattern is refutable. | |
1205 | /// | |
1206 | /// In an if-let, imagine it as `if (let <pat> = <expr>) { ... }`; in a let-else, it is part of the | |
1207 | /// desugaring to if-let. Only let-else supports the type annotation at present. | |
1208 | #[derive(Debug, HashStable_Generic)] | |
1209 | pub struct Let<'hir> { | |
1210 | pub hir_id: HirId, | |
1211 | pub span: Span, | |
1212 | pub pat: &'hir Pat<'hir>, | |
1213 | pub ty: Option<&'hir Ty<'hir>>, | |
1214 | pub init: &'hir Expr<'hir>, | |
1215 | } | |
1216 | ||
3dfed10e | 1217 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
1218 | pub enum Guard<'hir> { |
1219 | If(&'hir Expr<'hir>), | |
a2a8927a | 1220 | // FIXME use hir::Let for this. |
fc512014 | 1221 | IfLet(&'hir Pat<'hir>, &'hir Expr<'hir>), |
dfeec247 XL |
1222 | } |
1223 | ||
3dfed10e | 1224 | #[derive(Debug, HashStable_Generic)] |
6a06907d | 1225 | pub struct ExprField<'hir> { |
dfeec247 XL |
1226 | #[stable_hasher(ignore)] |
1227 | pub hir_id: HirId, | |
1228 | pub ident: Ident, | |
1229 | pub expr: &'hir Expr<'hir>, | |
1230 | pub span: Span, | |
1231 | pub is_shorthand: bool, | |
1232 | } | |
1233 | ||
3dfed10e | 1234 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
1235 | pub enum BlockCheckMode { |
1236 | DefaultBlock, | |
1237 | UnsafeBlock(UnsafeSource), | |
dfeec247 XL |
1238 | } |
1239 | ||
3dfed10e | 1240 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
1241 | pub enum UnsafeSource { |
1242 | CompilerGenerated, | |
1243 | UserProvided, | |
1244 | } | |
1245 | ||
a2a8927a | 1246 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Hash, Debug)] |
dfeec247 XL |
1247 | pub struct BodyId { |
1248 | pub hir_id: HirId, | |
1249 | } | |
1250 | ||
1251 | /// The body of a function, closure, or constant value. In the case of | |
1252 | /// a function, the body contains not only the function body itself | |
1253 | /// (which is an expression), but also the argument patterns, since | |
1254 | /// those are something that the caller doesn't really care about. | |
1255 | /// | |
1256 | /// # Examples | |
1257 | /// | |
1258 | /// ``` | |
1259 | /// fn foo((x, y): (u32, u32)) -> u32 { | |
1260 | /// x + y | |
1261 | /// } | |
1262 | /// ``` | |
1263 | /// | |
1264 | /// Here, the `Body` associated with `foo()` would contain: | |
1265 | /// | |
1266 | /// - an `params` array containing the `(x, y)` pattern | |
1267 | /// - a `value` containing the `x + y` expression (maybe wrapped in a block) | |
1268 | /// - `generator_kind` would be `None` | |
1269 | /// | |
1270 | /// All bodies have an **owner**, which can be accessed via the HIR | |
1271 | /// map using `body_owner_def_id()`. | |
3dfed10e | 1272 | #[derive(Debug)] |
dfeec247 XL |
1273 | pub struct Body<'hir> { |
1274 | pub params: &'hir [Param<'hir>], | |
1275 | pub value: Expr<'hir>, | |
1276 | pub generator_kind: Option<GeneratorKind>, | |
1277 | } | |
1278 | ||
a2a8927a | 1279 | impl<'hir> Body<'hir> { |
dfeec247 XL |
1280 | pub fn id(&self) -> BodyId { |
1281 | BodyId { hir_id: self.value.hir_id } | |
1282 | } | |
1283 | ||
1284 | pub fn generator_kind(&self) -> Option<GeneratorKind> { | |
1285 | self.generator_kind | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | /// The type of source expression that caused this generator to be created. | |
6a06907d XL |
1290 | #[derive( |
1291 | Clone, | |
1292 | PartialEq, | |
1293 | PartialOrd, | |
1294 | Eq, | |
1295 | Hash, | |
1296 | HashStable_Generic, | |
1297 | Encodable, | |
1298 | Decodable, | |
1299 | Debug, | |
1300 | Copy | |
1301 | )] | |
dfeec247 XL |
1302 | pub enum GeneratorKind { |
1303 | /// An explicit `async` block or the body of an async function. | |
1304 | Async(AsyncGeneratorKind), | |
1305 | ||
1306 | /// A generator literal created via a `yield` inside a closure. | |
1307 | Gen, | |
1308 | } | |
1309 | ||
1310 | impl fmt::Display for GeneratorKind { | |
1311 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
1312 | match self { | |
1313 | GeneratorKind::Async(k) => fmt::Display::fmt(k, f), | |
1314 | GeneratorKind::Gen => f.write_str("generator"), | |
1315 | } | |
1316 | } | |
1317 | } | |
1318 | ||
6a06907d XL |
1319 | impl GeneratorKind { |
1320 | pub fn descr(&self) -> &'static str { | |
1321 | match self { | |
1322 | GeneratorKind::Async(ask) => ask.descr(), | |
1323 | GeneratorKind::Gen => "generator", | |
1324 | } | |
1325 | } | |
1326 | } | |
1327 | ||
dfeec247 XL |
1328 | /// In the case of a generator created as part of an async construct, |
1329 | /// which kind of async construct caused it to be created? | |
1330 | /// | |
1331 | /// This helps error messages but is also used to drive coercions in | |
1332 | /// type-checking (see #60424). | |
6a06907d XL |
1333 | #[derive( |
1334 | Clone, | |
1335 | PartialEq, | |
1336 | PartialOrd, | |
1337 | Eq, | |
1338 | Hash, | |
1339 | HashStable_Generic, | |
1340 | Encodable, | |
1341 | Decodable, | |
1342 | Debug, | |
1343 | Copy | |
1344 | )] | |
dfeec247 XL |
1345 | pub enum AsyncGeneratorKind { |
1346 | /// An explicit `async` block written by the user. | |
1347 | Block, | |
1348 | ||
1349 | /// An explicit `async` block written by the user. | |
1350 | Closure, | |
1351 | ||
1352 | /// The `async` block generated as the body of an async function. | |
1353 | Fn, | |
1354 | } | |
1355 | ||
1356 | impl fmt::Display for AsyncGeneratorKind { | |
1357 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
1358 | f.write_str(match self { | |
1359 | AsyncGeneratorKind::Block => "`async` block", | |
1360 | AsyncGeneratorKind::Closure => "`async` closure body", | |
1361 | AsyncGeneratorKind::Fn => "`async fn` body", | |
1362 | }) | |
1363 | } | |
1364 | } | |
1365 | ||
6a06907d XL |
1366 | impl AsyncGeneratorKind { |
1367 | pub fn descr(&self) -> &'static str { | |
1368 | match self { | |
1369 | AsyncGeneratorKind::Block => "`async` block", | |
1370 | AsyncGeneratorKind::Closure => "`async` closure body", | |
1371 | AsyncGeneratorKind::Fn => "`async fn` body", | |
1372 | } | |
1373 | } | |
1374 | } | |
1375 | ||
dfeec247 XL |
1376 | #[derive(Copy, Clone, Debug)] |
1377 | pub enum BodyOwnerKind { | |
1378 | /// Functions and methods. | |
1379 | Fn, | |
1380 | ||
1381 | /// Closures | |
1382 | Closure, | |
1383 | ||
1384 | /// Constants and associated constants. | |
1385 | Const, | |
1386 | ||
1387 | /// Initializer of a `static` item. | |
1388 | Static(Mutability), | |
1389 | } | |
1390 | ||
1391 | impl BodyOwnerKind { | |
1392 | pub fn is_fn_or_closure(self) -> bool { | |
1393 | match self { | |
1394 | BodyOwnerKind::Fn | BodyOwnerKind::Closure => true, | |
1395 | BodyOwnerKind::Const | BodyOwnerKind::Static(_) => false, | |
1396 | } | |
1397 | } | |
1398 | } | |
1399 | ||
f9f354fc XL |
1400 | /// The kind of an item that requires const-checking. |
1401 | #[derive(Clone, Copy, Debug, PartialEq, Eq)] | |
1402 | pub enum ConstContext { | |
1403 | /// A `const fn`. | |
1404 | ConstFn, | |
1405 | ||
1406 | /// A `static` or `static mut`. | |
1407 | Static(Mutability), | |
1408 | ||
1409 | /// A `const`, associated `const`, or other const context. | |
1410 | /// | |
1411 | /// Other contexts include: | |
1412 | /// - Array length expressions | |
1413 | /// - Enum discriminants | |
1414 | /// - Const generics | |
1415 | /// | |
1416 | /// For the most part, other contexts are treated just like a regular `const`, so they are | |
1417 | /// lumped into the same category. | |
1418 | Const, | |
1419 | } | |
1420 | ||
1421 | impl ConstContext { | |
1422 | /// A description of this const context that can appear between backticks in an error message. | |
1423 | /// | |
1424 | /// E.g. `const` or `static mut`. | |
1425 | pub fn keyword_name(self) -> &'static str { | |
1426 | match self { | |
1427 | Self::Const => "const", | |
1428 | Self::Static(Mutability::Not) => "static", | |
1429 | Self::Static(Mutability::Mut) => "static mut", | |
1430 | Self::ConstFn => "const fn", | |
1431 | } | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | /// A colloquial, trivially pluralizable description of this const context for use in error | |
1436 | /// messages. | |
1437 | impl fmt::Display for ConstContext { | |
1438 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
1439 | match *self { | |
1440 | Self::Const => write!(f, "constant"), | |
1441 | Self::Static(_) => write!(f, "static"), | |
1442 | Self::ConstFn => write!(f, "constant function"), | |
1443 | } | |
1444 | } | |
1445 | } | |
1446 | ||
dfeec247 XL |
1447 | /// A literal. |
1448 | pub type Lit = Spanned<LitKind>; | |
1449 | ||
a2a8927a XL |
1450 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Debug, HashStable_Generic)] |
1451 | pub enum ArrayLen { | |
1452 | Infer(HirId, Span), | |
1453 | Body(AnonConst), | |
1454 | } | |
1455 | ||
1456 | impl ArrayLen { | |
1457 | pub fn hir_id(&self) -> HirId { | |
1458 | match self { | |
1459 | &ArrayLen::Infer(hir_id, _) | &ArrayLen::Body(AnonConst { hir_id, body: _ }) => hir_id, | |
1460 | } | |
1461 | } | |
1462 | } | |
1463 | ||
dfeec247 XL |
1464 | /// A constant (expression) that's not an item or associated item, |
1465 | /// but needs its own `DefId` for type-checking, const-eval, etc. | |
1466 | /// These are usually found nested inside types (e.g., array lengths) | |
1467 | /// or expressions (e.g., repeat counts), and also used to define | |
1468 | /// explicit discriminant values for enum variants. | |
94222f64 XL |
1469 | /// |
1470 | /// You can check if this anon const is a default in a const param | |
1471 | /// `const N: usize = { ... }` with `tcx.hir().opt_const_param_default_param_hir_id(..)` | |
3dfed10e | 1472 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
1473 | pub struct AnonConst { |
1474 | pub hir_id: HirId, | |
1475 | pub body: BodyId, | |
1476 | } | |
1477 | ||
1478 | /// An expression. | |
3dfed10e | 1479 | #[derive(Debug)] |
dfeec247 XL |
1480 | pub struct Expr<'hir> { |
1481 | pub hir_id: HirId, | |
1482 | pub kind: ExprKind<'hir>, | |
dfeec247 XL |
1483 | pub span: Span, |
1484 | } | |
1485 | ||
dfeec247 XL |
1486 | impl Expr<'_> { |
1487 | pub fn precedence(&self) -> ExprPrecedence { | |
1488 | match self.kind { | |
1489 | ExprKind::Box(_) => ExprPrecedence::Box, | |
29967ef6 | 1490 | ExprKind::ConstBlock(_) => ExprPrecedence::ConstBlock, |
dfeec247 XL |
1491 | ExprKind::Array(_) => ExprPrecedence::Array, |
1492 | ExprKind::Call(..) => ExprPrecedence::Call, | |
1493 | ExprKind::MethodCall(..) => ExprPrecedence::MethodCall, | |
1494 | ExprKind::Tup(_) => ExprPrecedence::Tup, | |
1495 | ExprKind::Binary(op, ..) => ExprPrecedence::Binary(op.node.into()), | |
1496 | ExprKind::Unary(..) => ExprPrecedence::Unary, | |
1497 | ExprKind::Lit(_) => ExprPrecedence::Lit, | |
1498 | ExprKind::Type(..) | ExprKind::Cast(..) => ExprPrecedence::Cast, | |
1499 | ExprKind::DropTemps(ref expr, ..) => expr.precedence(), | |
5869c6ff | 1500 | ExprKind::If(..) => ExprPrecedence::If, |
94222f64 | 1501 | ExprKind::Let(..) => ExprPrecedence::Let, |
dfeec247 XL |
1502 | ExprKind::Loop(..) => ExprPrecedence::Loop, |
1503 | ExprKind::Match(..) => ExprPrecedence::Match, | |
1504 | ExprKind::Closure(..) => ExprPrecedence::Closure, | |
1505 | ExprKind::Block(..) => ExprPrecedence::Block, | |
1506 | ExprKind::Assign(..) => ExprPrecedence::Assign, | |
1507 | ExprKind::AssignOp(..) => ExprPrecedence::AssignOp, | |
1508 | ExprKind::Field(..) => ExprPrecedence::Field, | |
1509 | ExprKind::Index(..) => ExprPrecedence::Index, | |
1510 | ExprKind::Path(..) => ExprPrecedence::Path, | |
1511 | ExprKind::AddrOf(..) => ExprPrecedence::AddrOf, | |
1512 | ExprKind::Break(..) => ExprPrecedence::Break, | |
1513 | ExprKind::Continue(..) => ExprPrecedence::Continue, | |
1514 | ExprKind::Ret(..) => ExprPrecedence::Ret, | |
f9f354fc | 1515 | ExprKind::InlineAsm(..) => ExprPrecedence::InlineAsm, |
dfeec247 XL |
1516 | ExprKind::Struct(..) => ExprPrecedence::Struct, |
1517 | ExprKind::Repeat(..) => ExprPrecedence::Repeat, | |
1518 | ExprKind::Yield(..) => ExprPrecedence::Yield, | |
1519 | ExprKind::Err => ExprPrecedence::Err, | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | // Whether this looks like a place expr, without checking for deref | |
1524 | // adjustments. | |
1525 | // This will return `true` in some potentially surprising cases such as | |
1526 | // `CONSTANT.field`. | |
1527 | pub fn is_syntactic_place_expr(&self) -> bool { | |
1528 | self.is_place_expr(|_| true) | |
1529 | } | |
1530 | ||
3dfed10e XL |
1531 | /// Whether this is a place expression. |
1532 | /// | |
1533 | /// `allow_projections_from` should return `true` if indexing a field or index expression based | |
1534 | /// on the given expression should be considered a place expression. | |
dfeec247 XL |
1535 | pub fn is_place_expr(&self, mut allow_projections_from: impl FnMut(&Self) -> bool) -> bool { |
1536 | match self.kind { | |
29967ef6 XL |
1537 | ExprKind::Path(QPath::Resolved(_, ref path)) => { |
1538 | matches!(path.res, Res::Local(..) | Res::Def(DefKind::Static, _) | Res::Err) | |
1539 | } | |
dfeec247 XL |
1540 | |
1541 | // Type ascription inherits its place expression kind from its | |
1542 | // operand. See: | |
1543 | // https://github.com/rust-lang/rfcs/blob/master/text/0803-type-ascription.md#type-ascription-and-temporaries | |
1544 | ExprKind::Type(ref e, _) => e.is_place_expr(allow_projections_from), | |
1545 | ||
6a06907d | 1546 | ExprKind::Unary(UnOp::Deref, _) => true, |
dfeec247 XL |
1547 | |
1548 | ExprKind::Field(ref base, _) | ExprKind::Index(ref base, _) => { | |
1549 | allow_projections_from(base) || base.is_place_expr(allow_projections_from) | |
1550 | } | |
1551 | ||
3dfed10e XL |
1552 | // Lang item paths cannot currently be local variables or statics. |
1553 | ExprKind::Path(QPath::LangItem(..)) => false, | |
1554 | ||
dfeec247 XL |
1555 | // Partially qualified paths in expressions can only legally |
1556 | // refer to associated items which are always rvalues. | |
1557 | ExprKind::Path(QPath::TypeRelative(..)) | |
1558 | | ExprKind::Call(..) | |
1559 | | ExprKind::MethodCall(..) | |
1560 | | ExprKind::Struct(..) | |
1561 | | ExprKind::Tup(..) | |
5869c6ff | 1562 | | ExprKind::If(..) |
dfeec247 XL |
1563 | | ExprKind::Match(..) |
1564 | | ExprKind::Closure(..) | |
1565 | | ExprKind::Block(..) | |
1566 | | ExprKind::Repeat(..) | |
1567 | | ExprKind::Array(..) | |
1568 | | ExprKind::Break(..) | |
1569 | | ExprKind::Continue(..) | |
1570 | | ExprKind::Ret(..) | |
94222f64 | 1571 | | ExprKind::Let(..) |
dfeec247 XL |
1572 | | ExprKind::Loop(..) |
1573 | | ExprKind::Assign(..) | |
f9f354fc | 1574 | | ExprKind::InlineAsm(..) |
dfeec247 XL |
1575 | | ExprKind::AssignOp(..) |
1576 | | ExprKind::Lit(_) | |
29967ef6 | 1577 | | ExprKind::ConstBlock(..) |
dfeec247 XL |
1578 | | ExprKind::Unary(..) |
1579 | | ExprKind::Box(..) | |
1580 | | ExprKind::AddrOf(..) | |
1581 | | ExprKind::Binary(..) | |
1582 | | ExprKind::Yield(..) | |
1583 | | ExprKind::Cast(..) | |
1584 | | ExprKind::DropTemps(..) | |
1585 | | ExprKind::Err => false, | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | /// If `Self.kind` is `ExprKind::DropTemps(expr)`, drill down until we get a non-`DropTemps` | |
1590 | /// `Expr`. This is used in suggestions to ignore this `ExprKind` as it is semantically | |
1591 | /// silent, only signaling the ownership system. By doing this, suggestions that check the | |
1592 | /// `ExprKind` of any given `Expr` for presentation don't have to care about `DropTemps` | |
1593 | /// beyond remembering to call this function before doing analysis on it. | |
1594 | pub fn peel_drop_temps(&self) -> &Self { | |
1595 | let mut expr = self; | |
1596 | while let ExprKind::DropTemps(inner) = &expr.kind { | |
1597 | expr = inner; | |
1598 | } | |
1599 | expr | |
1600 | } | |
6a06907d XL |
1601 | |
1602 | pub fn peel_blocks(&self) -> &Self { | |
1603 | let mut expr = self; | |
1604 | while let ExprKind::Block(Block { expr: Some(inner), .. }, _) = &expr.kind { | |
1605 | expr = inner; | |
1606 | } | |
1607 | expr | |
1608 | } | |
1609 | ||
1610 | pub fn can_have_side_effects(&self) -> bool { | |
1611 | match self.peel_drop_temps().kind { | |
1612 | ExprKind::Path(_) | ExprKind::Lit(_) => false, | |
1613 | ExprKind::Type(base, _) | |
1614 | | ExprKind::Unary(_, base) | |
1615 | | ExprKind::Field(base, _) | |
1616 | | ExprKind::Index(base, _) | |
1617 | | ExprKind::AddrOf(.., base) | |
1618 | | ExprKind::Cast(base, _) => { | |
1619 | // This isn't exactly true for `Index` and all `Unnary`, but we are using this | |
1620 | // method exclusively for diagnostics and there's a *cultural* pressure against | |
1621 | // them being used only for its side-effects. | |
1622 | base.can_have_side_effects() | |
1623 | } | |
1624 | ExprKind::Struct(_, fields, init) => fields | |
1625 | .iter() | |
1626 | .map(|field| field.expr) | |
1627 | .chain(init.into_iter()) | |
1628 | .all(|e| e.can_have_side_effects()), | |
1629 | ||
1630 | ExprKind::Array(args) | |
1631 | | ExprKind::Tup(args) | |
1632 | | ExprKind::Call( | |
1633 | Expr { | |
1634 | kind: | |
1635 | ExprKind::Path(QPath::Resolved( | |
1636 | None, | |
1637 | Path { res: Res::Def(DefKind::Ctor(_, CtorKind::Fn), _), .. }, | |
1638 | )), | |
1639 | .. | |
1640 | }, | |
1641 | args, | |
1642 | ) => args.iter().all(|arg| arg.can_have_side_effects()), | |
1643 | ExprKind::If(..) | |
1644 | | ExprKind::Match(..) | |
1645 | | ExprKind::MethodCall(..) | |
1646 | | ExprKind::Call(..) | |
1647 | | ExprKind::Closure(..) | |
1648 | | ExprKind::Block(..) | |
1649 | | ExprKind::Repeat(..) | |
1650 | | ExprKind::Break(..) | |
1651 | | ExprKind::Continue(..) | |
1652 | | ExprKind::Ret(..) | |
94222f64 | 1653 | | ExprKind::Let(..) |
6a06907d XL |
1654 | | ExprKind::Loop(..) |
1655 | | ExprKind::Assign(..) | |
1656 | | ExprKind::InlineAsm(..) | |
6a06907d XL |
1657 | | ExprKind::AssignOp(..) |
1658 | | ExprKind::ConstBlock(..) | |
1659 | | ExprKind::Box(..) | |
1660 | | ExprKind::Binary(..) | |
1661 | | ExprKind::Yield(..) | |
1662 | | ExprKind::DropTemps(..) | |
1663 | | ExprKind::Err => true, | |
1664 | } | |
1665 | } | |
dfeec247 XL |
1666 | } |
1667 | ||
dfeec247 XL |
1668 | /// Checks if the specified expression is a built-in range literal. |
1669 | /// (See: `LoweringContext::lower_expr()`). | |
3dfed10e | 1670 | pub fn is_range_literal(expr: &Expr<'_>) -> bool { |
dfeec247 XL |
1671 | match expr.kind { |
1672 | // All built-in range literals but `..=` and `..` desugar to `Struct`s. | |
3dfed10e XL |
1673 | ExprKind::Struct(ref qpath, _, _) => matches!( |
1674 | **qpath, | |
1675 | QPath::LangItem( | |
1676 | LangItem::Range | |
5869c6ff XL |
1677 | | LangItem::RangeTo |
1678 | | LangItem::RangeFrom | |
1679 | | LangItem::RangeFull | |
1680 | | LangItem::RangeToInclusive, | |
a2a8927a | 1681 | .. |
3dfed10e XL |
1682 | ) |
1683 | ), | |
dfeec247 XL |
1684 | |
1685 | // `..=` desugars into `::std::ops::RangeInclusive::new(...)`. | |
1686 | ExprKind::Call(ref func, _) => { | |
a2a8927a | 1687 | matches!(func.kind, ExprKind::Path(QPath::LangItem(LangItem::RangeInclusiveNew, ..))) |
dfeec247 XL |
1688 | } |
1689 | ||
3dfed10e | 1690 | _ => false, |
dfeec247 | 1691 | } |
dfeec247 XL |
1692 | } |
1693 | ||
3dfed10e | 1694 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
1695 | pub enum ExprKind<'hir> { |
1696 | /// A `box x` expression. | |
1697 | Box(&'hir Expr<'hir>), | |
29967ef6 XL |
1698 | /// Allow anonymous constants from an inline `const` block |
1699 | ConstBlock(AnonConst), | |
dfeec247 XL |
1700 | /// An array (e.g., `[a, b, c, d]`). |
1701 | Array(&'hir [Expr<'hir>]), | |
1702 | /// A function call. | |
1703 | /// | |
1704 | /// The first field resolves to the function itself (usually an `ExprKind::Path`), | |
1705 | /// and the second field is the list of arguments. | |
1706 | /// This also represents calling the constructor of | |
1707 | /// tuple-like ADTs such as tuple structs and enum variants. | |
1708 | Call(&'hir Expr<'hir>, &'hir [Expr<'hir>]), | |
1709 | /// A method call (e.g., `x.foo::<'static, Bar, Baz>(a, b, c, d)`). | |
1710 | /// | |
5099ac24 | 1711 | /// The `PathSegment` represents the method name and its generic arguments |
dfeec247 | 1712 | /// (within the angle brackets). |
5099ac24 | 1713 | /// The first element of the `&[Expr]` is the expression that evaluates |
dfeec247 XL |
1714 | /// to the object on which the method is being called on (the receiver), |
1715 | /// and the remaining elements are the rest of the arguments. | |
1716 | /// Thus, `x.foo::<Bar, Baz>(a, b, c, d)` is represented as | |
5099ac24 | 1717 | /// `ExprKind::MethodCall(PathSegment { foo, [Bar, Baz] }, [x, a, b, c, d], span)`. |
f035d41b XL |
1718 | /// The final `Span` represents the span of the function and arguments |
1719 | /// (e.g. `foo::<Bar, Baz>(a, b, c, d)` in `x.foo::<Bar, Baz>(a, b, c, d)` | |
dfeec247 XL |
1720 | /// |
1721 | /// To resolve the called method to a `DefId`, call [`type_dependent_def_id`] with | |
1722 | /// the `hir_id` of the `MethodCall` node itself. | |
1723 | /// | |
3dfed10e | 1724 | /// [`type_dependent_def_id`]: ../ty/struct.TypeckResults.html#method.type_dependent_def_id |
5099ac24 | 1725 | MethodCall(&'hir PathSegment<'hir>, &'hir [Expr<'hir>], Span), |
dfeec247 XL |
1726 | /// A tuple (e.g., `(a, b, c, d)`). |
1727 | Tup(&'hir [Expr<'hir>]), | |
1728 | /// A binary operation (e.g., `a + b`, `a * b`). | |
1729 | Binary(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>), | |
1730 | /// A unary operation (e.g., `!x`, `*x`). | |
1731 | Unary(UnOp, &'hir Expr<'hir>), | |
1732 | /// A literal (e.g., `1`, `"foo"`). | |
1733 | Lit(Lit), | |
1734 | /// A cast (e.g., `foo as f64`). | |
1735 | Cast(&'hir Expr<'hir>, &'hir Ty<'hir>), | |
1736 | /// A type reference (e.g., `Foo`). | |
1737 | Type(&'hir Expr<'hir>, &'hir Ty<'hir>), | |
1738 | /// Wraps the expression in a terminating scope. | |
1739 | /// This makes it semantically equivalent to `{ let _t = expr; _t }`. | |
1740 | /// | |
1741 | /// This construct only exists to tweak the drop order in HIR lowering. | |
1742 | /// An example of that is the desugaring of `for` loops. | |
1743 | DropTemps(&'hir Expr<'hir>), | |
94222f64 XL |
1744 | /// A `let $pat = $expr` expression. |
1745 | /// | |
1746 | /// These are not `Local` and only occur as expressions. | |
1747 | /// The `let Some(x) = foo()` in `if let Some(x) = foo()` is an example of `Let(..)`. | |
a2a8927a | 1748 | Let(&'hir Let<'hir>), |
5869c6ff XL |
1749 | /// An `if` block, with an optional else block. |
1750 | /// | |
1751 | /// I.e., `if <expr> { <expr> } else { <expr> }`. | |
1752 | If(&'hir Expr<'hir>, &'hir Expr<'hir>, Option<&'hir Expr<'hir>>), | |
dfeec247 XL |
1753 | /// A conditionless loop (can be exited with `break`, `continue`, or `return`). |
1754 | /// | |
1755 | /// I.e., `'label: loop { <block> }`. | |
5869c6ff XL |
1756 | /// |
1757 | /// The `Span` is the loop header (`for x in y`/`while let pat = expr`). | |
1758 | Loop(&'hir Block<'hir>, Option<Label>, LoopSource, Span), | |
dfeec247 XL |
1759 | /// A `match` block, with a source that indicates whether or not it is |
1760 | /// the result of a desugaring, and if so, which kind. | |
1761 | Match(&'hir Expr<'hir>, &'hir [Arm<'hir>], MatchSource), | |
1762 | /// A closure (e.g., `move |a, b, c| {a + b + c}`). | |
1763 | /// | |
1764 | /// The `Span` is the argument block `|...|`. | |
1765 | /// | |
1766 | /// This may also be a generator literal or an `async block` as indicated by the | |
1767 | /// `Option<Movability>`. | |
1768 | Closure(CaptureBy, &'hir FnDecl<'hir>, BodyId, Span, Option<Movability>), | |
1769 | /// A block (e.g., `'label: { ... }`). | |
1770 | Block(&'hir Block<'hir>, Option<Label>), | |
1771 | ||
1772 | /// An assignment (e.g., `a = foo()`). | |
1773 | Assign(&'hir Expr<'hir>, &'hir Expr<'hir>, Span), | |
1774 | /// An assignment with an operator. | |
1775 | /// | |
1776 | /// E.g., `a += 1`. | |
1777 | AssignOp(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>), | |
1778 | /// Access of a named (e.g., `obj.foo`) or unnamed (e.g., `obj.0`) struct or tuple field. | |
1779 | Field(&'hir Expr<'hir>, Ident), | |
1780 | /// An indexing operation (`foo[2]`). | |
1781 | Index(&'hir Expr<'hir>, &'hir Expr<'hir>), | |
1782 | ||
1783 | /// Path to a definition, possibly containing lifetime or type parameters. | |
1784 | Path(QPath<'hir>), | |
1785 | ||
1786 | /// A referencing operation (i.e., `&a` or `&mut a`). | |
1787 | AddrOf(BorrowKind, Mutability, &'hir Expr<'hir>), | |
1788 | /// A `break`, with an optional label to break. | |
1789 | Break(Destination, Option<&'hir Expr<'hir>>), | |
1790 | /// A `continue`, with an optional label. | |
1791 | Continue(Destination), | |
1792 | /// A `return`, with an optional value to be returned. | |
1793 | Ret(Option<&'hir Expr<'hir>>), | |
1794 | ||
f9f354fc XL |
1795 | /// Inline assembly (from `asm!`), with its outputs and inputs. |
1796 | InlineAsm(&'hir InlineAsm<'hir>), | |
dfeec247 XL |
1797 | |
1798 | /// A struct or struct-like variant literal expression. | |
1799 | /// | |
1800 | /// E.g., `Foo {x: 1, y: 2}`, or `Foo {x: 1, .. base}`, | |
1801 | /// where `base` is the `Option<Expr>`. | |
6a06907d | 1802 | Struct(&'hir QPath<'hir>, &'hir [ExprField<'hir>], Option<&'hir Expr<'hir>>), |
dfeec247 XL |
1803 | |
1804 | /// An array literal constructed from one repeated element. | |
1805 | /// | |
1806 | /// E.g., `[1; 5]`. The first expression is the element | |
1807 | /// to be repeated; the second is the number of times to repeat it. | |
a2a8927a | 1808 | Repeat(&'hir Expr<'hir>, ArrayLen), |
dfeec247 XL |
1809 | |
1810 | /// A suspension point for generators (i.e., `yield <expr>`). | |
1811 | Yield(&'hir Expr<'hir>, YieldSource), | |
1812 | ||
1813 | /// A placeholder for an expression that wasn't syntactically well formed in some way. | |
1814 | Err, | |
1815 | } | |
1816 | ||
1817 | /// Represents an optionally `Self`-qualified value/type path or associated extension. | |
1818 | /// | |
1819 | /// To resolve the path to a `DefId`, call [`qpath_res`]. | |
1820 | /// | |
3dfed10e XL |
1821 | /// [`qpath_res`]: ../rustc_middle/ty/struct.TypeckResults.html#method.qpath_res |
1822 | #[derive(Debug, HashStable_Generic)] | |
dfeec247 XL |
1823 | pub enum QPath<'hir> { |
1824 | /// Path to a definition, optionally "fully-qualified" with a `Self` | |
1825 | /// type, if the path points to an associated item in a trait. | |
1826 | /// | |
1827 | /// E.g., an unqualified path like `Clone::clone` has `None` for `Self`, | |
1828 | /// while `<Vec<T> as Clone>::clone` has `Some(Vec<T>)` for `Self`, | |
1829 | /// even though they both have the same two-segment `Clone::clone` `Path`. | |
1830 | Resolved(Option<&'hir Ty<'hir>>, &'hir Path<'hir>), | |
1831 | ||
1832 | /// Type-related paths (e.g., `<T>::default` or `<T>::Output`). | |
1833 | /// Will be resolved by type-checking to an associated item. | |
1834 | /// | |
1835 | /// UFCS source paths can desugar into this, with `Vec::new` turning into | |
1836 | /// `<Vec>::new`, and `T::X::Y::method` into `<<<T>::X>::Y>::method`, | |
1837 | /// the `X` and `Y` nodes each being a `TyKind::Path(QPath::TypeRelative(..))`. | |
1838 | TypeRelative(&'hir Ty<'hir>, &'hir PathSegment<'hir>), | |
3dfed10e | 1839 | |
a2a8927a XL |
1840 | /// Reference to a `#[lang = "foo"]` item. `HirId` of the inner expr. |
1841 | LangItem(LangItem, Span, Option<HirId>), | |
3dfed10e XL |
1842 | } |
1843 | ||
1844 | impl<'hir> QPath<'hir> { | |
1845 | /// Returns the span of this `QPath`. | |
1846 | pub fn span(&self) -> Span { | |
1847 | match *self { | |
1848 | QPath::Resolved(_, path) => path.span, | |
6a06907d | 1849 | QPath::TypeRelative(qself, ps) => qself.span.to(ps.ident.span), |
a2a8927a | 1850 | QPath::LangItem(_, span, _) => span, |
3dfed10e XL |
1851 | } |
1852 | } | |
1853 | ||
1854 | /// Returns the span of the qself of this `QPath`. For example, `()` in | |
1855 | /// `<() as Trait>::method`. | |
1856 | pub fn qself_span(&self) -> Span { | |
1857 | match *self { | |
1858 | QPath::Resolved(_, path) => path.span, | |
1859 | QPath::TypeRelative(qself, _) => qself.span, | |
a2a8927a | 1860 | QPath::LangItem(_, span, _) => span, |
3dfed10e XL |
1861 | } |
1862 | } | |
1863 | ||
1864 | /// Returns the span of the last segment of this `QPath`. For example, `method` in | |
1865 | /// `<() as Trait>::method`. | |
1866 | pub fn last_segment_span(&self) -> Span { | |
1867 | match *self { | |
1868 | QPath::Resolved(_, path) => path.segments.last().unwrap().ident.span, | |
1869 | QPath::TypeRelative(_, segment) => segment.ident.span, | |
a2a8927a | 1870 | QPath::LangItem(_, span, _) => span, |
3dfed10e XL |
1871 | } |
1872 | } | |
dfeec247 XL |
1873 | } |
1874 | ||
1875 | /// Hints at the original code for a let statement. | |
3dfed10e | 1876 | #[derive(Copy, Clone, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
1877 | pub enum LocalSource { |
1878 | /// A `match _ { .. }`. | |
1879 | Normal, | |
dfeec247 XL |
1880 | /// When lowering async functions, we create locals within the `async move` so that |
1881 | /// all parameters are dropped after the future is polled. | |
1882 | /// | |
1883 | /// ```ignore (pseudo-Rust) | |
1884 | /// async fn foo(<pattern> @ x: Type) { | |
1885 | /// async move { | |
1886 | /// let <pattern> = x; | |
1887 | /// } | |
1888 | /// } | |
1889 | /// ``` | |
1890 | AsyncFn, | |
1891 | /// A desugared `<expr>.await`. | |
1892 | AwaitDesugar, | |
29967ef6 XL |
1893 | /// A desugared `expr = expr`, where the LHS is a tuple, struct or array. |
1894 | /// The span is that of the `=` sign. | |
1895 | AssignDesugar(Span), | |
dfeec247 XL |
1896 | } |
1897 | ||
1898 | /// Hints at the original code for a `match _ { .. }`. | |
3dfed10e | 1899 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Hash, Debug)] |
dfeec247 XL |
1900 | #[derive(HashStable_Generic)] |
1901 | pub enum MatchSource { | |
1902 | /// A `match _ { .. }`. | |
1903 | Normal, | |
dfeec247 XL |
1904 | /// A desugared `for _ in _ { .. }` loop. |
1905 | ForLoopDesugar, | |
1906 | /// A desugared `?` operator. | |
1907 | TryDesugar, | |
1908 | /// A desugared `<expr>.await`. | |
1909 | AwaitDesugar, | |
1910 | } | |
1911 | ||
1912 | impl MatchSource { | |
94222f64 XL |
1913 | #[inline] |
1914 | pub const fn name(self) -> &'static str { | |
dfeec247 XL |
1915 | use MatchSource::*; |
1916 | match self { | |
1917 | Normal => "match", | |
dfeec247 XL |
1918 | ForLoopDesugar => "for", |
1919 | TryDesugar => "?", | |
1920 | AwaitDesugar => ".await", | |
1921 | } | |
1922 | } | |
1923 | } | |
1924 | ||
1925 | /// The loop type that yielded an `ExprKind::Loop`. | |
3dfed10e | 1926 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
1927 | pub enum LoopSource { |
1928 | /// A `loop { .. }` loop. | |
1929 | Loop, | |
1930 | /// A `while _ { .. }` loop. | |
1931 | While, | |
dfeec247 XL |
1932 | /// A `for _ in _ { .. }` loop. |
1933 | ForLoop, | |
1934 | } | |
1935 | ||
1936 | impl LoopSource { | |
1937 | pub fn name(self) -> &'static str { | |
1938 | match self { | |
1939 | LoopSource::Loop => "loop", | |
94222f64 | 1940 | LoopSource::While => "while", |
dfeec247 XL |
1941 | LoopSource::ForLoop => "for", |
1942 | } | |
1943 | } | |
1944 | } | |
1945 | ||
3dfed10e | 1946 | #[derive(Copy, Clone, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
1947 | pub enum LoopIdError { |
1948 | OutsideLoopScope, | |
1949 | UnlabeledCfInWhileCondition, | |
1950 | UnresolvedLabel, | |
1951 | } | |
1952 | ||
1953 | impl fmt::Display for LoopIdError { | |
1954 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
1955 | f.write_str(match self { | |
1956 | LoopIdError::OutsideLoopScope => "not inside loop scope", | |
1957 | LoopIdError::UnlabeledCfInWhileCondition => { | |
1958 | "unlabeled control flow (break or continue) in while condition" | |
1959 | } | |
1960 | LoopIdError::UnresolvedLabel => "label not found", | |
1961 | }) | |
1962 | } | |
1963 | } | |
1964 | ||
3dfed10e | 1965 | #[derive(Copy, Clone, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
1966 | pub struct Destination { |
1967 | // This is `Some(_)` iff there is an explicit user-specified `label | |
1968 | pub label: Option<Label>, | |
1969 | ||
1970 | // These errors are caught and then reported during the diagnostics pass in | |
1971 | // librustc_passes/loops.rs | |
1972 | pub target_id: Result<HirId, LoopIdError>, | |
1973 | } | |
1974 | ||
1975 | /// The yield kind that caused an `ExprKind::Yield`. | |
3dfed10e | 1976 | #[derive(Copy, Clone, PartialEq, Eq, Debug, Encodable, Decodable, HashStable_Generic)] |
dfeec247 XL |
1977 | pub enum YieldSource { |
1978 | /// An `<expr>.await`. | |
ba9703b0 | 1979 | Await { expr: Option<HirId> }, |
dfeec247 XL |
1980 | /// A plain `yield`. |
1981 | Yield, | |
1982 | } | |
1983 | ||
ba9703b0 XL |
1984 | impl YieldSource { |
1985 | pub fn is_await(&self) -> bool { | |
1986 | match self { | |
1987 | YieldSource::Await { .. } => true, | |
1988 | YieldSource::Yield => false, | |
1989 | } | |
1990 | } | |
1991 | } | |
1992 | ||
dfeec247 XL |
1993 | impl fmt::Display for YieldSource { |
1994 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
1995 | f.write_str(match self { | |
ba9703b0 | 1996 | YieldSource::Await { .. } => "`await`", |
dfeec247 XL |
1997 | YieldSource::Yield => "`yield`", |
1998 | }) | |
1999 | } | |
2000 | } | |
2001 | ||
2002 | impl From<GeneratorKind> for YieldSource { | |
2003 | fn from(kind: GeneratorKind) -> Self { | |
2004 | match kind { | |
2005 | // Guess based on the kind of the current generator. | |
2006 | GeneratorKind::Gen => Self::Yield, | |
ba9703b0 | 2007 | GeneratorKind::Async(_) => Self::Await { expr: None }, |
dfeec247 XL |
2008 | } |
2009 | } | |
2010 | } | |
2011 | ||
2012 | // N.B., if you change this, you'll probably want to change the corresponding | |
2013 | // type structure in middle/ty.rs as well. | |
3dfed10e | 2014 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2015 | pub struct MutTy<'hir> { |
2016 | pub ty: &'hir Ty<'hir>, | |
2017 | pub mutbl: Mutability, | |
2018 | } | |
2019 | ||
2020 | /// Represents a function's signature in a trait declaration, | |
2021 | /// trait implementation, or a free function. | |
3dfed10e | 2022 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2023 | pub struct FnSig<'hir> { |
2024 | pub header: FnHeader, | |
2025 | pub decl: &'hir FnDecl<'hir>, | |
3dfed10e | 2026 | pub span: Span, |
dfeec247 XL |
2027 | } |
2028 | ||
2029 | // The bodies for items are stored "out of line", in a separate | |
fc512014 | 2030 | // hashmap in the `Crate`. Here we just record the hir-id of the item |
dfeec247 | 2031 | // so it can fetched later. |
a2a8927a | 2032 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Debug)] |
dfeec247 | 2033 | pub struct TraitItemId { |
6a06907d XL |
2034 | pub def_id: LocalDefId, |
2035 | } | |
2036 | ||
2037 | impl TraitItemId { | |
2038 | #[inline] | |
2039 | pub fn hir_id(&self) -> HirId { | |
2040 | // Items are always HIR owners. | |
2041 | HirId::make_owner(self.def_id) | |
2042 | } | |
dfeec247 XL |
2043 | } |
2044 | ||
2045 | /// Represents an item declaration within a trait declaration, | |
2046 | /// possibly including a default implementation. A trait item is | |
2047 | /// either required (meaning it doesn't have an implementation, just a | |
2048 | /// signature) or provided (meaning it has a default implementation). | |
3dfed10e | 2049 | #[derive(Debug)] |
dfeec247 XL |
2050 | pub struct TraitItem<'hir> { |
2051 | pub ident: Ident, | |
6a06907d | 2052 | pub def_id: LocalDefId, |
dfeec247 XL |
2053 | pub generics: Generics<'hir>, |
2054 | pub kind: TraitItemKind<'hir>, | |
2055 | pub span: Span, | |
2056 | } | |
2057 | ||
6a06907d XL |
2058 | impl TraitItem<'_> { |
2059 | #[inline] | |
2060 | pub fn hir_id(&self) -> HirId { | |
2061 | // Items are always HIR owners. | |
2062 | HirId::make_owner(self.def_id) | |
2063 | } | |
2064 | ||
2065 | pub fn trait_item_id(&self) -> TraitItemId { | |
2066 | TraitItemId { def_id: self.def_id } | |
2067 | } | |
2068 | } | |
2069 | ||
dfeec247 | 2070 | /// Represents a trait method's body (or just argument names). |
3dfed10e | 2071 | #[derive(Encodable, Debug, HashStable_Generic)] |
ba9703b0 | 2072 | pub enum TraitFn<'hir> { |
dfeec247 XL |
2073 | /// No default body in the trait, just a signature. |
2074 | Required(&'hir [Ident]), | |
2075 | ||
2076 | /// Both signature and body are provided in the trait. | |
2077 | Provided(BodyId), | |
2078 | } | |
2079 | ||
2080 | /// Represents a trait method or associated constant or type | |
3dfed10e | 2081 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2082 | pub enum TraitItemKind<'hir> { |
2083 | /// An associated constant with an optional value (otherwise `impl`s must contain a value). | |
2084 | Const(&'hir Ty<'hir>, Option<BodyId>), | |
ba9703b0 XL |
2085 | /// An associated function with an optional body. |
2086 | Fn(FnSig<'hir>, TraitFn<'hir>), | |
dfeec247 XL |
2087 | /// An associated type with (possibly empty) bounds and optional concrete |
2088 | /// type. | |
2089 | Type(GenericBounds<'hir>, Option<&'hir Ty<'hir>>), | |
2090 | } | |
2091 | ||
2092 | // The bodies for items are stored "out of line", in a separate | |
fc512014 | 2093 | // hashmap in the `Crate`. Here we just record the hir-id of the item |
dfeec247 | 2094 | // so it can fetched later. |
a2a8927a | 2095 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Debug)] |
dfeec247 | 2096 | pub struct ImplItemId { |
6a06907d XL |
2097 | pub def_id: LocalDefId, |
2098 | } | |
2099 | ||
2100 | impl ImplItemId { | |
2101 | #[inline] | |
2102 | pub fn hir_id(&self) -> HirId { | |
2103 | // Items are always HIR owners. | |
2104 | HirId::make_owner(self.def_id) | |
2105 | } | |
dfeec247 XL |
2106 | } |
2107 | ||
2108 | /// Represents anything within an `impl` block. | |
3dfed10e | 2109 | #[derive(Debug)] |
dfeec247 XL |
2110 | pub struct ImplItem<'hir> { |
2111 | pub ident: Ident, | |
6a06907d | 2112 | pub def_id: LocalDefId, |
dfeec247 | 2113 | pub vis: Visibility<'hir>, |
dfeec247 XL |
2114 | pub generics: Generics<'hir>, |
2115 | pub kind: ImplItemKind<'hir>, | |
2116 | pub span: Span, | |
2117 | } | |
2118 | ||
6a06907d XL |
2119 | impl ImplItem<'_> { |
2120 | #[inline] | |
2121 | pub fn hir_id(&self) -> HirId { | |
2122 | // Items are always HIR owners. | |
2123 | HirId::make_owner(self.def_id) | |
2124 | } | |
2125 | ||
2126 | pub fn impl_item_id(&self) -> ImplItemId { | |
2127 | ImplItemId { def_id: self.def_id } | |
2128 | } | |
2129 | } | |
2130 | ||
dfeec247 | 2131 | /// Represents various kinds of content within an `impl`. |
3dfed10e | 2132 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2133 | pub enum ImplItemKind<'hir> { |
2134 | /// An associated constant of the given type, set to the constant result | |
2135 | /// of the expression. | |
2136 | Const(&'hir Ty<'hir>, BodyId), | |
ba9703b0 XL |
2137 | /// An associated function implementation with the given signature and body. |
2138 | Fn(FnSig<'hir>, BodyId), | |
dfeec247 XL |
2139 | /// An associated type. |
2140 | TyAlias(&'hir Ty<'hir>), | |
dfeec247 XL |
2141 | } |
2142 | ||
2143 | // The name of the associated type for `Fn` return types. | |
2144 | pub const FN_OUTPUT_NAME: Symbol = sym::Output; | |
2145 | ||
2146 | /// Bind a type to an associated type (i.e., `A = Foo`). | |
2147 | /// | |
2148 | /// Bindings like `A: Debug` are represented as a special type `A = | |
2149 | /// $::Debug` that is understood by the astconv code. | |
2150 | /// | |
2151 | /// FIXME(alexreg): why have a separate type for the binding case, | |
2152 | /// wouldn't it be better to make the `ty` field an enum like the | |
2153 | /// following? | |
2154 | /// | |
2155 | /// ``` | |
2156 | /// enum TypeBindingKind { | |
2157 | /// Equals(...), | |
2158 | /// Binding(...), | |
2159 | /// } | |
2160 | /// ``` | |
3dfed10e | 2161 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2162 | pub struct TypeBinding<'hir> { |
2163 | pub hir_id: HirId, | |
dfeec247 | 2164 | pub ident: Ident, |
5869c6ff | 2165 | pub gen_args: &'hir GenericArgs<'hir>, |
dfeec247 XL |
2166 | pub kind: TypeBindingKind<'hir>, |
2167 | pub span: Span, | |
2168 | } | |
2169 | ||
5099ac24 FG |
2170 | #[derive(Debug, HashStable_Generic)] |
2171 | pub enum Term<'hir> { | |
2172 | Ty(&'hir Ty<'hir>), | |
2173 | Const(AnonConst), | |
2174 | } | |
2175 | ||
2176 | impl<'hir> From<&'hir Ty<'hir>> for Term<'hir> { | |
2177 | fn from(ty: &'hir Ty<'hir>) -> Self { | |
2178 | Term::Ty(ty) | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | impl<'hir> From<AnonConst> for Term<'hir> { | |
2183 | fn from(c: AnonConst) -> Self { | |
2184 | Term::Const(c) | |
2185 | } | |
2186 | } | |
2187 | ||
dfeec247 | 2188 | // Represents the two kinds of type bindings. |
3dfed10e | 2189 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2190 | pub enum TypeBindingKind<'hir> { |
2191 | /// E.g., `Foo<Bar: Send>`. | |
2192 | Constraint { bounds: &'hir [GenericBound<'hir>] }, | |
5099ac24 FG |
2193 | /// E.g., `Foo<Bar = ()>`, `Foo<Bar = ()>` |
2194 | Equality { term: Term<'hir> }, | |
dfeec247 XL |
2195 | } |
2196 | ||
2197 | impl TypeBinding<'_> { | |
2198 | pub fn ty(&self) -> &Ty<'_> { | |
2199 | match self.kind { | |
5099ac24 | 2200 | TypeBindingKind::Equality { term: Term::Ty(ref ty) } => ty, |
dfeec247 XL |
2201 | _ => panic!("expected equality type binding for parenthesized generic args"), |
2202 | } | |
2203 | } | |
5099ac24 FG |
2204 | pub fn opt_const(&self) -> Option<&'_ AnonConst> { |
2205 | match self.kind { | |
2206 | TypeBindingKind::Equality { term: Term::Const(ref c) } => Some(c), | |
2207 | _ => None, | |
2208 | } | |
2209 | } | |
dfeec247 XL |
2210 | } |
2211 | ||
3dfed10e | 2212 | #[derive(Debug)] |
dfeec247 XL |
2213 | pub struct Ty<'hir> { |
2214 | pub hir_id: HirId, | |
2215 | pub kind: TyKind<'hir>, | |
2216 | pub span: Span, | |
2217 | } | |
2218 | ||
dfeec247 | 2219 | /// Not represented directly in the AST; referred to by name through a `ty_path`. |
3dfed10e | 2220 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Hash, Debug)] |
dfeec247 XL |
2221 | #[derive(HashStable_Generic)] |
2222 | pub enum PrimTy { | |
2223 | Int(IntTy), | |
2224 | Uint(UintTy), | |
2225 | Float(FloatTy), | |
2226 | Str, | |
2227 | Bool, | |
2228 | Char, | |
2229 | } | |
2230 | ||
1b1a35ee | 2231 | impl PrimTy { |
6a06907d XL |
2232 | /// All of the primitive types |
2233 | pub const ALL: [Self; 17] = [ | |
2234 | // any changes here should also be reflected in `PrimTy::from_name` | |
2235 | Self::Int(IntTy::I8), | |
2236 | Self::Int(IntTy::I16), | |
2237 | Self::Int(IntTy::I32), | |
2238 | Self::Int(IntTy::I64), | |
2239 | Self::Int(IntTy::I128), | |
2240 | Self::Int(IntTy::Isize), | |
2241 | Self::Uint(UintTy::U8), | |
2242 | Self::Uint(UintTy::U16), | |
2243 | Self::Uint(UintTy::U32), | |
2244 | Self::Uint(UintTy::U64), | |
2245 | Self::Uint(UintTy::U128), | |
2246 | Self::Uint(UintTy::Usize), | |
2247 | Self::Float(FloatTy::F32), | |
2248 | Self::Float(FloatTy::F64), | |
2249 | Self::Bool, | |
2250 | Self::Char, | |
2251 | Self::Str, | |
2252 | ]; | |
2253 | ||
cdc7bbd5 XL |
2254 | /// Like [`PrimTy::name`], but returns a &str instead of a symbol. |
2255 | /// | |
2256 | /// Used by clippy. | |
1b1a35ee XL |
2257 | pub fn name_str(self) -> &'static str { |
2258 | match self { | |
2259 | PrimTy::Int(i) => i.name_str(), | |
2260 | PrimTy::Uint(u) => u.name_str(), | |
2261 | PrimTy::Float(f) => f.name_str(), | |
2262 | PrimTy::Str => "str", | |
2263 | PrimTy::Bool => "bool", | |
2264 | PrimTy::Char => "char", | |
2265 | } | |
2266 | } | |
2267 | ||
2268 | pub fn name(self) -> Symbol { | |
2269 | match self { | |
2270 | PrimTy::Int(i) => i.name(), | |
2271 | PrimTy::Uint(u) => u.name(), | |
2272 | PrimTy::Float(f) => f.name(), | |
2273 | PrimTy::Str => sym::str, | |
2274 | PrimTy::Bool => sym::bool, | |
2275 | PrimTy::Char => sym::char, | |
2276 | } | |
2277 | } | |
6a06907d XL |
2278 | |
2279 | /// Returns the matching `PrimTy` for a `Symbol` such as "str" or "i32". | |
2280 | /// Returns `None` if no matching type is found. | |
2281 | pub fn from_name(name: Symbol) -> Option<Self> { | |
2282 | let ty = match name { | |
2283 | // any changes here should also be reflected in `PrimTy::ALL` | |
2284 | sym::i8 => Self::Int(IntTy::I8), | |
2285 | sym::i16 => Self::Int(IntTy::I16), | |
2286 | sym::i32 => Self::Int(IntTy::I32), | |
2287 | sym::i64 => Self::Int(IntTy::I64), | |
2288 | sym::i128 => Self::Int(IntTy::I128), | |
2289 | sym::isize => Self::Int(IntTy::Isize), | |
2290 | sym::u8 => Self::Uint(UintTy::U8), | |
2291 | sym::u16 => Self::Uint(UintTy::U16), | |
2292 | sym::u32 => Self::Uint(UintTy::U32), | |
2293 | sym::u64 => Self::Uint(UintTy::U64), | |
2294 | sym::u128 => Self::Uint(UintTy::U128), | |
2295 | sym::usize => Self::Uint(UintTy::Usize), | |
2296 | sym::f32 => Self::Float(FloatTy::F32), | |
2297 | sym::f64 => Self::Float(FloatTy::F64), | |
2298 | sym::bool => Self::Bool, | |
2299 | sym::char => Self::Char, | |
2300 | sym::str => Self::Str, | |
2301 | _ => return None, | |
2302 | }; | |
2303 | Some(ty) | |
2304 | } | |
1b1a35ee XL |
2305 | } |
2306 | ||
3dfed10e | 2307 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2308 | pub struct BareFnTy<'hir> { |
2309 | pub unsafety: Unsafety, | |
2310 | pub abi: Abi, | |
2311 | pub generic_params: &'hir [GenericParam<'hir>], | |
2312 | pub decl: &'hir FnDecl<'hir>, | |
2313 | pub param_names: &'hir [Ident], | |
2314 | } | |
2315 | ||
3dfed10e | 2316 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2317 | pub struct OpaqueTy<'hir> { |
2318 | pub generics: Generics<'hir>, | |
2319 | pub bounds: GenericBounds<'hir>, | |
dfeec247 XL |
2320 | pub origin: OpaqueTyOrigin, |
2321 | } | |
2322 | ||
2323 | /// From whence the opaque type came. | |
136023e0 | 2324 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)] |
dfeec247 | 2325 | pub enum OpaqueTyOrigin { |
dfeec247 | 2326 | /// `-> impl Trait` |
a2a8927a | 2327 | FnReturn(LocalDefId), |
dfeec247 | 2328 | /// `async fn` |
a2a8927a | 2329 | AsyncFn(LocalDefId), |
6a06907d XL |
2330 | /// type aliases: `type Foo = impl Trait;` |
2331 | TyAlias, | |
dfeec247 XL |
2332 | } |
2333 | ||
2334 | /// The various kinds of types recognized by the compiler. | |
3dfed10e | 2335 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2336 | pub enum TyKind<'hir> { |
2337 | /// A variable length slice (i.e., `[T]`). | |
2338 | Slice(&'hir Ty<'hir>), | |
2339 | /// A fixed length array (i.e., `[T; n]`). | |
a2a8927a | 2340 | Array(&'hir Ty<'hir>, ArrayLen), |
dfeec247 XL |
2341 | /// A raw pointer (i.e., `*const T` or `*mut T`). |
2342 | Ptr(MutTy<'hir>), | |
2343 | /// A reference (i.e., `&'a T` or `&'a mut T`). | |
2344 | Rptr(Lifetime, MutTy<'hir>), | |
2345 | /// A bare function (e.g., `fn(usize) -> bool`). | |
2346 | BareFn(&'hir BareFnTy<'hir>), | |
2347 | /// The never type (`!`). | |
2348 | Never, | |
2349 | /// A tuple (`(A, B, C, D, ...)`). | |
2350 | Tup(&'hir [Ty<'hir>]), | |
2351 | /// A path to a type definition (`module::module::...::Type`), or an | |
2352 | /// associated type (e.g., `<Vec<T> as Trait>::Type` or `<T>::Target`). | |
2353 | /// | |
2354 | /// Type parameters may be stored in each `PathSegment`. | |
2355 | Path(QPath<'hir>), | |
c295e0f8 | 2356 | /// An opaque type definition itself. This is only used for `impl Trait`. |
dfeec247 | 2357 | /// |
f035d41b XL |
2358 | /// The generic argument list contains the lifetimes (and in the future |
2359 | /// possibly parameters) that are actually bound on the `impl Trait`. | |
2360 | OpaqueDef(ItemId, &'hir [GenericArg<'hir>]), | |
dfeec247 XL |
2361 | /// A trait object type `Bound1 + Bound2 + Bound3` |
2362 | /// where `Bound` is a trait or a lifetime. | |
6a06907d | 2363 | TraitObject(&'hir [PolyTraitRef<'hir>], Lifetime, TraitObjectSyntax), |
dfeec247 XL |
2364 | /// Unused for now. |
2365 | Typeof(AnonConst), | |
2366 | /// `TyKind::Infer` means the type should be inferred instead of it having been | |
2367 | /// specified. This can appear anywhere in a type. | |
2368 | Infer, | |
2369 | /// Placeholder for a type that has failed to be defined. | |
2370 | Err, | |
2371 | } | |
2372 | ||
3dfed10e | 2373 | #[derive(Debug, HashStable_Generic)] |
f9f354fc XL |
2374 | pub enum InlineAsmOperand<'hir> { |
2375 | In { | |
2376 | reg: InlineAsmRegOrRegClass, | |
2377 | expr: Expr<'hir>, | |
2378 | }, | |
2379 | Out { | |
2380 | reg: InlineAsmRegOrRegClass, | |
2381 | late: bool, | |
2382 | expr: Option<Expr<'hir>>, | |
2383 | }, | |
2384 | InOut { | |
2385 | reg: InlineAsmRegOrRegClass, | |
2386 | late: bool, | |
2387 | expr: Expr<'hir>, | |
2388 | }, | |
2389 | SplitInOut { | |
2390 | reg: InlineAsmRegOrRegClass, | |
2391 | late: bool, | |
2392 | in_expr: Expr<'hir>, | |
2393 | out_expr: Option<Expr<'hir>>, | |
2394 | }, | |
2395 | Const { | |
cdc7bbd5 | 2396 | anon_const: AnonConst, |
f9f354fc XL |
2397 | }, |
2398 | Sym { | |
2399 | expr: Expr<'hir>, | |
2400 | }, | |
2401 | } | |
2402 | ||
2403 | impl<'hir> InlineAsmOperand<'hir> { | |
2404 | pub fn reg(&self) -> Option<InlineAsmRegOrRegClass> { | |
2405 | match *self { | |
2406 | Self::In { reg, .. } | |
2407 | | Self::Out { reg, .. } | |
2408 | | Self::InOut { reg, .. } | |
2409 | | Self::SplitInOut { reg, .. } => Some(reg), | |
2410 | Self::Const { .. } | Self::Sym { .. } => None, | |
2411 | } | |
2412 | } | |
c295e0f8 XL |
2413 | |
2414 | pub fn is_clobber(&self) -> bool { | |
2415 | matches!( | |
2416 | self, | |
2417 | InlineAsmOperand::Out { reg: InlineAsmRegOrRegClass::Reg(_), late: _, expr: None } | |
2418 | ) | |
2419 | } | |
f9f354fc XL |
2420 | } |
2421 | ||
3dfed10e | 2422 | #[derive(Debug, HashStable_Generic)] |
f9f354fc XL |
2423 | pub struct InlineAsm<'hir> { |
2424 | pub template: &'hir [InlineAsmTemplatePiece], | |
94222f64 | 2425 | pub template_strs: &'hir [(Symbol, Option<Symbol>, Span)], |
fc512014 | 2426 | pub operands: &'hir [(InlineAsmOperand<'hir>, Span)], |
f9f354fc XL |
2427 | pub options: InlineAsmOptions, |
2428 | pub line_spans: &'hir [Span], | |
2429 | } | |
2430 | ||
dfeec247 | 2431 | /// Represents a parameter in a function header. |
3dfed10e | 2432 | #[derive(Debug, HashStable_Generic)] |
dfeec247 | 2433 | pub struct Param<'hir> { |
dfeec247 XL |
2434 | pub hir_id: HirId, |
2435 | pub pat: &'hir Pat<'hir>, | |
3dfed10e | 2436 | pub ty_span: Span, |
dfeec247 XL |
2437 | pub span: Span, |
2438 | } | |
2439 | ||
2440 | /// Represents the header (not the body) of a function declaration. | |
3dfed10e | 2441 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2442 | pub struct FnDecl<'hir> { |
2443 | /// The types of the function's parameters. | |
2444 | /// | |
f9f354fc | 2445 | /// Additional argument data is stored in the function's [body](Body::params). |
dfeec247 | 2446 | pub inputs: &'hir [Ty<'hir>], |
74b04a01 | 2447 | pub output: FnRetTy<'hir>, |
dfeec247 XL |
2448 | pub c_variadic: bool, |
2449 | /// Does the function have an implicit self? | |
2450 | pub implicit_self: ImplicitSelfKind, | |
2451 | } | |
2452 | ||
2453 | /// Represents what type of implicit self a function has, if any. | |
3dfed10e | 2454 | #[derive(Copy, Clone, Encodable, Decodable, Debug, HashStable_Generic)] |
dfeec247 XL |
2455 | pub enum ImplicitSelfKind { |
2456 | /// Represents a `fn x(self);`. | |
2457 | Imm, | |
2458 | /// Represents a `fn x(mut self);`. | |
2459 | Mut, | |
2460 | /// Represents a `fn x(&self);`. | |
2461 | ImmRef, | |
2462 | /// Represents a `fn x(&mut self);`. | |
2463 | MutRef, | |
2464 | /// Represents when a function does not have a self argument or | |
2465 | /// when a function has a `self: X` argument. | |
2466 | None, | |
2467 | } | |
2468 | ||
2469 | impl ImplicitSelfKind { | |
2470 | /// Does this represent an implicit self? | |
2471 | pub fn has_implicit_self(&self) -> bool { | |
29967ef6 | 2472 | !matches!(*self, ImplicitSelfKind::None) |
dfeec247 XL |
2473 | } |
2474 | } | |
2475 | ||
3dfed10e | 2476 | #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Encodable, Decodable, Debug)] |
74b04a01 | 2477 | #[derive(HashStable_Generic)] |
dfeec247 XL |
2478 | pub enum IsAsync { |
2479 | Async, | |
2480 | NotAsync, | |
2481 | } | |
2482 | ||
3dfed10e | 2483 | #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, Encodable, Decodable, HashStable_Generic)] |
dfeec247 XL |
2484 | pub enum Defaultness { |
2485 | Default { has_value: bool }, | |
2486 | Final, | |
2487 | } | |
2488 | ||
2489 | impl Defaultness { | |
2490 | pub fn has_value(&self) -> bool { | |
2491 | match *self { | |
ba9703b0 | 2492 | Defaultness::Default { has_value } => has_value, |
dfeec247 XL |
2493 | Defaultness::Final => true, |
2494 | } | |
2495 | } | |
2496 | ||
2497 | pub fn is_final(&self) -> bool { | |
2498 | *self == Defaultness::Final | |
2499 | } | |
2500 | ||
2501 | pub fn is_default(&self) -> bool { | |
29967ef6 | 2502 | matches!(*self, Defaultness::Default { .. }) |
dfeec247 XL |
2503 | } |
2504 | } | |
2505 | ||
3dfed10e | 2506 | #[derive(Debug, HashStable_Generic)] |
74b04a01 | 2507 | pub enum FnRetTy<'hir> { |
dfeec247 XL |
2508 | /// Return type is not specified. |
2509 | /// | |
2510 | /// Functions default to `()` and | |
2511 | /// closures default to inference. Span points to where return | |
2512 | /// type would be inserted. | |
2513 | DefaultReturn(Span), | |
2514 | /// Everything else. | |
2515 | Return(&'hir Ty<'hir>), | |
2516 | } | |
2517 | ||
74b04a01 | 2518 | impl FnRetTy<'_> { |
17df50a5 | 2519 | #[inline] |
dfeec247 XL |
2520 | pub fn span(&self) -> Span { |
2521 | match *self { | |
2522 | Self::DefaultReturn(span) => span, | |
2523 | Self::Return(ref ty) => ty.span, | |
2524 | } | |
2525 | } | |
2526 | } | |
2527 | ||
a2a8927a | 2528 | #[derive(Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
2529 | pub struct Mod<'hir> { |
2530 | /// A span from the first token past `{` to the last token until `}`. | |
2531 | /// For `mod foo;`, the inner span ranges from the first token | |
2532 | /// to the last token in the external file. | |
2533 | pub inner: Span, | |
2534 | pub item_ids: &'hir [ItemId], | |
2535 | } | |
2536 | ||
3dfed10e | 2537 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2538 | pub struct EnumDef<'hir> { |
2539 | pub variants: &'hir [Variant<'hir>], | |
2540 | } | |
2541 | ||
3dfed10e | 2542 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2543 | pub struct Variant<'hir> { |
2544 | /// Name of the variant. | |
dfeec247 | 2545 | pub ident: Ident, |
dfeec247 XL |
2546 | /// Id of the variant (not the constructor, see `VariantData::ctor_hir_id()`). |
2547 | pub id: HirId, | |
2548 | /// Fields and constructor id of the variant. | |
2549 | pub data: VariantData<'hir>, | |
2550 | /// Explicit discriminant (e.g., `Foo = 1`). | |
2551 | pub disr_expr: Option<AnonConst>, | |
2552 | /// Span | |
2553 | pub span: Span, | |
2554 | } | |
2555 | ||
3dfed10e | 2556 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
2557 | pub enum UseKind { |
2558 | /// One import, e.g., `use foo::bar` or `use foo::bar as baz`. | |
2559 | /// Also produced for each element of a list `use`, e.g. | |
2560 | /// `use foo::{a, b}` lowers to `use foo::a; use foo::b;`. | |
2561 | Single, | |
2562 | ||
2563 | /// Glob import, e.g., `use foo::*`. | |
2564 | Glob, | |
2565 | ||
2566 | /// Degenerate list import, e.g., `use foo::{a, b}` produces | |
2567 | /// an additional `use foo::{}` for performing checks such as | |
2568 | /// unstable feature gating. May be removed in the future. | |
2569 | ListStem, | |
2570 | } | |
2571 | ||
2572 | /// References to traits in impls. | |
2573 | /// | |
2574 | /// `resolve` maps each `TraitRef`'s `ref_id` to its defining trait; that's all | |
2575 | /// that the `ref_id` is for. Note that `ref_id`'s value is not the `HirId` of the | |
2576 | /// trait being referred to but just a unique `HirId` that serves as a key | |
2577 | /// within the resolution map. | |
cdc7bbd5 | 2578 | #[derive(Clone, Debug, HashStable_Generic)] |
dfeec247 XL |
2579 | pub struct TraitRef<'hir> { |
2580 | pub path: &'hir Path<'hir>, | |
2581 | // Don't hash the `ref_id`. It is tracked via the thing it is used to access. | |
2582 | #[stable_hasher(ignore)] | |
2583 | pub hir_ref_id: HirId, | |
2584 | } | |
2585 | ||
2586 | impl TraitRef<'_> { | |
2587 | /// Gets the `DefId` of the referenced trait. It _must_ actually be a trait or trait alias. | |
ba9703b0 | 2588 | pub fn trait_def_id(&self) -> Option<DefId> { |
dfeec247 | 2589 | match self.path.res { |
ba9703b0 XL |
2590 | Res::Def(DefKind::Trait | DefKind::TraitAlias, did) => Some(did), |
2591 | Res::Err => None, | |
dfeec247 XL |
2592 | _ => unreachable!(), |
2593 | } | |
2594 | } | |
2595 | } | |
2596 | ||
cdc7bbd5 | 2597 | #[derive(Clone, Debug, HashStable_Generic)] |
dfeec247 | 2598 | pub struct PolyTraitRef<'hir> { |
74b04a01 | 2599 | /// The `'a` in `for<'a> Foo<&'a T>`. |
dfeec247 XL |
2600 | pub bound_generic_params: &'hir [GenericParam<'hir>], |
2601 | ||
74b04a01 | 2602 | /// The `Foo<&'a T>` in `for<'a> Foo<&'a T>`. |
dfeec247 XL |
2603 | pub trait_ref: TraitRef<'hir>, |
2604 | ||
2605 | pub span: Span, | |
2606 | } | |
2607 | ||
2608 | pub type Visibility<'hir> = Spanned<VisibilityKind<'hir>>; | |
2609 | ||
94222f64 | 2610 | #[derive(Copy, Clone, Debug)] |
dfeec247 XL |
2611 | pub enum VisibilityKind<'hir> { |
2612 | Public, | |
2613 | Crate(CrateSugar), | |
2614 | Restricted { path: &'hir Path<'hir>, hir_id: HirId }, | |
2615 | Inherited, | |
2616 | } | |
2617 | ||
2618 | impl VisibilityKind<'_> { | |
2619 | pub fn is_pub(&self) -> bool { | |
29967ef6 | 2620 | matches!(*self, VisibilityKind::Public) |
dfeec247 XL |
2621 | } |
2622 | ||
2623 | pub fn is_pub_restricted(&self) -> bool { | |
2624 | match *self { | |
2625 | VisibilityKind::Public | VisibilityKind::Inherited => false, | |
2626 | VisibilityKind::Crate(..) | VisibilityKind::Restricted { .. } => true, | |
2627 | } | |
2628 | } | |
dfeec247 XL |
2629 | } |
2630 | ||
3dfed10e | 2631 | #[derive(Debug, HashStable_Generic)] |
6a06907d | 2632 | pub struct FieldDef<'hir> { |
dfeec247 | 2633 | pub span: Span, |
dfeec247 XL |
2634 | pub ident: Ident, |
2635 | pub vis: Visibility<'hir>, | |
2636 | pub hir_id: HirId, | |
2637 | pub ty: &'hir Ty<'hir>, | |
dfeec247 XL |
2638 | } |
2639 | ||
6a06907d | 2640 | impl FieldDef<'_> { |
dfeec247 XL |
2641 | // Still necessary in couple of places |
2642 | pub fn is_positional(&self) -> bool { | |
2643 | let first = self.ident.as_str().as_bytes()[0]; | |
fc512014 | 2644 | (b'0'..=b'9').contains(&first) |
dfeec247 XL |
2645 | } |
2646 | } | |
2647 | ||
2648 | /// Fields and constructor IDs of enum variants and structs. | |
3dfed10e | 2649 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2650 | pub enum VariantData<'hir> { |
2651 | /// A struct variant. | |
2652 | /// | |
2653 | /// E.g., `Bar { .. }` as in `enum Foo { Bar { .. } }`. | |
6a06907d | 2654 | Struct(&'hir [FieldDef<'hir>], /* recovered */ bool), |
dfeec247 XL |
2655 | /// A tuple variant. |
2656 | /// | |
2657 | /// E.g., `Bar(..)` as in `enum Foo { Bar(..) }`. | |
6a06907d | 2658 | Tuple(&'hir [FieldDef<'hir>], HirId), |
dfeec247 XL |
2659 | /// A unit variant. |
2660 | /// | |
2661 | /// E.g., `Bar = ..` as in `enum Foo { Bar = .. }`. | |
2662 | Unit(HirId), | |
2663 | } | |
2664 | ||
a2a8927a | 2665 | impl<'hir> VariantData<'hir> { |
dfeec247 | 2666 | /// Return the fields of this variant. |
6a06907d | 2667 | pub fn fields(&self) -> &'hir [FieldDef<'hir>] { |
dfeec247 XL |
2668 | match *self { |
2669 | VariantData::Struct(ref fields, ..) | VariantData::Tuple(ref fields, ..) => fields, | |
2670 | _ => &[], | |
2671 | } | |
2672 | } | |
2673 | ||
2674 | /// Return the `HirId` of this variant's constructor, if it has one. | |
2675 | pub fn ctor_hir_id(&self) -> Option<HirId> { | |
2676 | match *self { | |
2677 | VariantData::Struct(_, _) => None, | |
2678 | VariantData::Tuple(_, hir_id) | VariantData::Unit(hir_id) => Some(hir_id), | |
2679 | } | |
2680 | } | |
2681 | } | |
2682 | ||
2683 | // The bodies for items are stored "out of line", in a separate | |
fc512014 | 2684 | // hashmap in the `Crate`. Here we just record the hir-id of the item |
dfeec247 | 2685 | // so it can fetched later. |
a2a8927a | 2686 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Debug, Hash)] |
dfeec247 | 2687 | pub struct ItemId { |
6a06907d XL |
2688 | pub def_id: LocalDefId, |
2689 | } | |
2690 | ||
2691 | impl ItemId { | |
2692 | #[inline] | |
2693 | pub fn hir_id(&self) -> HirId { | |
2694 | // Items are always HIR owners. | |
2695 | HirId::make_owner(self.def_id) | |
2696 | } | |
dfeec247 XL |
2697 | } |
2698 | ||
2699 | /// An item | |
2700 | /// | |
2701 | /// The name might be a dummy name in case of anonymous items | |
3dfed10e | 2702 | #[derive(Debug)] |
dfeec247 XL |
2703 | pub struct Item<'hir> { |
2704 | pub ident: Ident, | |
6a06907d | 2705 | pub def_id: LocalDefId, |
dfeec247 XL |
2706 | pub kind: ItemKind<'hir>, |
2707 | pub vis: Visibility<'hir>, | |
2708 | pub span: Span, | |
2709 | } | |
2710 | ||
6a06907d XL |
2711 | impl Item<'_> { |
2712 | #[inline] | |
2713 | pub fn hir_id(&self) -> HirId { | |
2714 | // Items are always HIR owners. | |
2715 | HirId::make_owner(self.def_id) | |
2716 | } | |
2717 | ||
2718 | pub fn item_id(&self) -> ItemId { | |
2719 | ItemId { def_id: self.def_id } | |
2720 | } | |
2721 | } | |
2722 | ||
74b04a01 | 2723 | #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)] |
3dfed10e | 2724 | #[derive(Encodable, Decodable, HashStable_Generic)] |
74b04a01 XL |
2725 | pub enum Unsafety { |
2726 | Unsafe, | |
2727 | Normal, | |
2728 | } | |
2729 | ||
2730 | impl Unsafety { | |
2731 | pub fn prefix_str(&self) -> &'static str { | |
2732 | match self { | |
2733 | Self::Unsafe => "unsafe ", | |
2734 | Self::Normal => "", | |
2735 | } | |
2736 | } | |
2737 | } | |
2738 | ||
2739 | impl fmt::Display for Unsafety { | |
2740 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
2741 | f.write_str(match *self { | |
2742 | Self::Unsafe => "unsafe", | |
2743 | Self::Normal => "normal", | |
2744 | }) | |
2745 | } | |
2746 | } | |
2747 | ||
2748 | #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)] | |
3dfed10e | 2749 | #[derive(Encodable, Decodable, HashStable_Generic)] |
74b04a01 XL |
2750 | pub enum Constness { |
2751 | Const, | |
2752 | NotConst, | |
2753 | } | |
2754 | ||
94222f64 XL |
2755 | impl fmt::Display for Constness { |
2756 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
2757 | f.write_str(match *self { | |
2758 | Self::Const => "const", | |
2759 | Self::NotConst => "non-const", | |
2760 | }) | |
2761 | } | |
2762 | } | |
2763 | ||
3dfed10e | 2764 | #[derive(Copy, Clone, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
2765 | pub struct FnHeader { |
2766 | pub unsafety: Unsafety, | |
2767 | pub constness: Constness, | |
2768 | pub asyncness: IsAsync, | |
2769 | pub abi: Abi, | |
2770 | } | |
2771 | ||
2772 | impl FnHeader { | |
5099ac24 FG |
2773 | pub fn is_async(&self) -> bool { |
2774 | matches!(&self.asyncness, IsAsync::Async) | |
2775 | } | |
2776 | ||
dfeec247 | 2777 | pub fn is_const(&self) -> bool { |
29967ef6 | 2778 | matches!(&self.constness, Constness::Const) |
dfeec247 XL |
2779 | } |
2780 | } | |
2781 | ||
3dfed10e | 2782 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2783 | pub enum ItemKind<'hir> { |
2784 | /// An `extern crate` item, with optional *original* crate name if the crate was renamed. | |
2785 | /// | |
2786 | /// E.g., `extern crate foo` or `extern crate foo_bar as foo`. | |
f9f354fc | 2787 | ExternCrate(Option<Symbol>), |
dfeec247 XL |
2788 | |
2789 | /// `use foo::bar::*;` or `use foo::bar::baz as quux;` | |
2790 | /// | |
2791 | /// or just | |
2792 | /// | |
2793 | /// `use foo::bar::baz;` (with `as baz` implicitly on the right). | |
2794 | Use(&'hir Path<'hir>, UseKind), | |
2795 | ||
2796 | /// A `static` item. | |
2797 | Static(&'hir Ty<'hir>, Mutability, BodyId), | |
2798 | /// A `const` item. | |
2799 | Const(&'hir Ty<'hir>, BodyId), | |
2800 | /// A function declaration. | |
2801 | Fn(FnSig<'hir>, Generics<'hir>, BodyId), | |
94222f64 XL |
2802 | /// A MBE macro definition (`macro_rules!` or `macro`). |
2803 | Macro(ast::MacroDef), | |
dfeec247 XL |
2804 | /// A module. |
2805 | Mod(Mod<'hir>), | |
2806 | /// An external module, e.g. `extern { .. }`. | |
c295e0f8 | 2807 | ForeignMod { abi: Abi, items: &'hir [ForeignItemRef] }, |
dfeec247 | 2808 | /// Module-level inline assembly (from `global_asm!`). |
17df50a5 | 2809 | GlobalAsm(&'hir InlineAsm<'hir>), |
dfeec247 XL |
2810 | /// A type alias, e.g., `type Foo = Bar<u8>`. |
2811 | TyAlias(&'hir Ty<'hir>, Generics<'hir>), | |
2812 | /// An opaque `impl Trait` type alias, e.g., `type Foo = impl Bar;`. | |
2813 | OpaqueTy(OpaqueTy<'hir>), | |
2814 | /// An enum definition, e.g., `enum Foo<A, B> {C<A>, D<B>}`. | |
2815 | Enum(EnumDef<'hir>, Generics<'hir>), | |
2816 | /// A struct definition, e.g., `struct Foo<A> {x: A}`. | |
2817 | Struct(VariantData<'hir>, Generics<'hir>), | |
2818 | /// A union definition, e.g., `union Foo<A, B> {x: A, y: B}`. | |
2819 | Union(VariantData<'hir>, Generics<'hir>), | |
2820 | /// A trait definition. | |
2821 | Trait(IsAuto, Unsafety, Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]), | |
2822 | /// A trait alias. | |
2823 | TraitAlias(Generics<'hir>, GenericBounds<'hir>), | |
2824 | ||
2825 | /// An implementation, e.g., `impl<A> Trait for Foo { .. }`. | |
5869c6ff XL |
2826 | Impl(Impl<'hir>), |
2827 | } | |
2828 | ||
2829 | #[derive(Debug, HashStable_Generic)] | |
2830 | pub struct Impl<'hir> { | |
2831 | pub unsafety: Unsafety, | |
2832 | pub polarity: ImplPolarity, | |
2833 | pub defaultness: Defaultness, | |
2834 | // We do not put a `Span` in `Defaultness` because it breaks foreign crate metadata | |
2835 | // decoding as `Span`s cannot be decoded when a `Session` is not available. | |
2836 | pub defaultness_span: Option<Span>, | |
2837 | pub constness: Constness, | |
2838 | pub generics: Generics<'hir>, | |
2839 | ||
2840 | /// The trait being implemented, if any. | |
2841 | pub of_trait: Option<TraitRef<'hir>>, | |
2842 | ||
2843 | pub self_ty: &'hir Ty<'hir>, | |
c295e0f8 | 2844 | pub items: &'hir [ImplItemRef], |
dfeec247 XL |
2845 | } |
2846 | ||
2847 | impl ItemKind<'_> { | |
dfeec247 XL |
2848 | pub fn generics(&self) -> Option<&Generics<'_>> { |
2849 | Some(match *self { | |
2850 | ItemKind::Fn(_, ref generics, _) | |
2851 | | ItemKind::TyAlias(_, ref generics) | |
a2a8927a XL |
2852 | | ItemKind::OpaqueTy(OpaqueTy { |
2853 | ref generics, origin: OpaqueTyOrigin::TyAlias, .. | |
2854 | }) | |
dfeec247 XL |
2855 | | ItemKind::Enum(_, ref generics) |
2856 | | ItemKind::Struct(_, ref generics) | |
2857 | | ItemKind::Union(_, ref generics) | |
2858 | | ItemKind::Trait(_, _, ref generics, _, _) | |
5869c6ff | 2859 | | ItemKind::Impl(Impl { ref generics, .. }) => generics, |
dfeec247 XL |
2860 | _ => return None, |
2861 | }) | |
2862 | } | |
136023e0 XL |
2863 | |
2864 | pub fn descr(&self) -> &'static str { | |
2865 | match self { | |
2866 | ItemKind::ExternCrate(..) => "extern crate", | |
2867 | ItemKind::Use(..) => "`use` import", | |
2868 | ItemKind::Static(..) => "static item", | |
2869 | ItemKind::Const(..) => "constant item", | |
2870 | ItemKind::Fn(..) => "function", | |
94222f64 | 2871 | ItemKind::Macro(..) => "macro", |
136023e0 XL |
2872 | ItemKind::Mod(..) => "module", |
2873 | ItemKind::ForeignMod { .. } => "extern block", | |
2874 | ItemKind::GlobalAsm(..) => "global asm item", | |
2875 | ItemKind::TyAlias(..) => "type alias", | |
2876 | ItemKind::OpaqueTy(..) => "opaque type", | |
2877 | ItemKind::Enum(..) => "enum", | |
2878 | ItemKind::Struct(..) => "struct", | |
2879 | ItemKind::Union(..) => "union", | |
2880 | ItemKind::Trait(..) => "trait", | |
2881 | ItemKind::TraitAlias(..) => "trait alias", | |
2882 | ItemKind::Impl(..) => "implementation", | |
2883 | } | |
2884 | } | |
dfeec247 XL |
2885 | } |
2886 | ||
2887 | /// A reference from an trait to one of its associated items. This | |
2888 | /// contains the item's id, naturally, but also the item's name and | |
2889 | /// some other high-level details (like whether it is an associated | |
2890 | /// type or method, and whether it is public). This allows other | |
2891 | /// passes to find the impl they want without loading the ID (which | |
2892 | /// means fewer edges in the incremental compilation graph). | |
3dfed10e | 2893 | #[derive(Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
2894 | pub struct TraitItemRef { |
2895 | pub id: TraitItemId, | |
dfeec247 XL |
2896 | pub ident: Ident, |
2897 | pub kind: AssocItemKind, | |
2898 | pub span: Span, | |
2899 | pub defaultness: Defaultness, | |
2900 | } | |
2901 | ||
2902 | /// A reference from an impl to one of its associated items. This | |
2903 | /// contains the item's ID, naturally, but also the item's name and | |
2904 | /// some other high-level details (like whether it is an associated | |
2905 | /// type or method, and whether it is public). This allows other | |
2906 | /// passes to find the impl they want without loading the ID (which | |
2907 | /// means fewer edges in the incremental compilation graph). | |
3dfed10e | 2908 | #[derive(Debug, HashStable_Generic)] |
c295e0f8 | 2909 | pub struct ImplItemRef { |
dfeec247 | 2910 | pub id: ImplItemId, |
dfeec247 XL |
2911 | pub ident: Ident, |
2912 | pub kind: AssocItemKind, | |
2913 | pub span: Span, | |
dfeec247 | 2914 | pub defaultness: Defaultness, |
5099ac24 FG |
2915 | /// When we are in a trait impl, link to the trait-item's id. |
2916 | pub trait_item_def_id: Option<DefId>, | |
dfeec247 XL |
2917 | } |
2918 | ||
3dfed10e | 2919 | #[derive(Copy, Clone, PartialEq, Encodable, Debug, HashStable_Generic)] |
dfeec247 XL |
2920 | pub enum AssocItemKind { |
2921 | Const, | |
ba9703b0 | 2922 | Fn { has_self: bool }, |
dfeec247 | 2923 | Type, |
dfeec247 XL |
2924 | } |
2925 | ||
fc512014 XL |
2926 | // The bodies for items are stored "out of line", in a separate |
2927 | // hashmap in the `Crate`. Here we just record the hir-id of the item | |
2928 | // so it can fetched later. | |
a2a8927a | 2929 | #[derive(Copy, Clone, PartialEq, Eq, Encodable, Debug)] |
fc512014 | 2930 | pub struct ForeignItemId { |
6a06907d XL |
2931 | pub def_id: LocalDefId, |
2932 | } | |
2933 | ||
2934 | impl ForeignItemId { | |
2935 | #[inline] | |
2936 | pub fn hir_id(&self) -> HirId { | |
2937 | // Items are always HIR owners. | |
2938 | HirId::make_owner(self.def_id) | |
2939 | } | |
fc512014 XL |
2940 | } |
2941 | ||
2942 | /// A reference from a foreign block to one of its items. This | |
2943 | /// contains the item's ID, naturally, but also the item's name and | |
2944 | /// some other high-level details (like whether it is an associated | |
2945 | /// type or method, and whether it is public). This allows other | |
2946 | /// passes to find the impl they want without loading the ID (which | |
2947 | /// means fewer edges in the incremental compilation graph). | |
2948 | #[derive(Debug, HashStable_Generic)] | |
c295e0f8 | 2949 | pub struct ForeignItemRef { |
fc512014 | 2950 | pub id: ForeignItemId, |
fc512014 XL |
2951 | pub ident: Ident, |
2952 | pub span: Span, | |
fc512014 XL |
2953 | } |
2954 | ||
6a06907d | 2955 | #[derive(Debug)] |
dfeec247 | 2956 | pub struct ForeignItem<'hir> { |
dfeec247 | 2957 | pub ident: Ident, |
dfeec247 | 2958 | pub kind: ForeignItemKind<'hir>, |
6a06907d | 2959 | pub def_id: LocalDefId, |
dfeec247 XL |
2960 | pub span: Span, |
2961 | pub vis: Visibility<'hir>, | |
2962 | } | |
2963 | ||
6a06907d XL |
2964 | impl ForeignItem<'_> { |
2965 | #[inline] | |
2966 | pub fn hir_id(&self) -> HirId { | |
2967 | // Items are always HIR owners. | |
2968 | HirId::make_owner(self.def_id) | |
2969 | } | |
2970 | ||
2971 | pub fn foreign_item_id(&self) -> ForeignItemId { | |
2972 | ForeignItemId { def_id: self.def_id } | |
2973 | } | |
2974 | } | |
2975 | ||
dfeec247 | 2976 | /// An item within an `extern` block. |
3dfed10e | 2977 | #[derive(Debug, HashStable_Generic)] |
dfeec247 XL |
2978 | pub enum ForeignItemKind<'hir> { |
2979 | /// A foreign function. | |
2980 | Fn(&'hir FnDecl<'hir>, &'hir [Ident], Generics<'hir>), | |
2981 | /// A foreign static item (`static ext: u8`). | |
2982 | Static(&'hir Ty<'hir>, Mutability), | |
2983 | /// A foreign type. | |
2984 | Type, | |
2985 | } | |
2986 | ||
dfeec247 | 2987 | /// A variable captured by a closure. |
3dfed10e | 2988 | #[derive(Debug, Copy, Clone, Encodable, HashStable_Generic)] |
dfeec247 XL |
2989 | pub struct Upvar { |
2990 | // First span where it is accessed (there can be multiple). | |
2991 | pub span: Span, | |
2992 | } | |
2993 | ||
dfeec247 XL |
2994 | // The TraitCandidate's import_ids is empty if the trait is defined in the same module, and |
2995 | // has length > 0 if the trait is found through an chain of imports, starting with the | |
2996 | // import/use statement in the scope where the trait is used. | |
3dfed10e | 2997 | #[derive(Encodable, Decodable, Clone, Debug)] |
f035d41b | 2998 | pub struct TraitCandidate { |
dfeec247 | 2999 | pub def_id: DefId, |
f035d41b | 3000 | pub import_ids: SmallVec<[LocalDefId; 1]>, |
dfeec247 XL |
3001 | } |
3002 | ||
94222f64 XL |
3003 | #[derive(Copy, Clone, Debug, HashStable_Generic)] |
3004 | pub enum OwnerNode<'hir> { | |
3005 | Item(&'hir Item<'hir>), | |
3006 | ForeignItem(&'hir ForeignItem<'hir>), | |
3007 | TraitItem(&'hir TraitItem<'hir>), | |
3008 | ImplItem(&'hir ImplItem<'hir>), | |
3009 | Crate(&'hir Mod<'hir>), | |
3010 | } | |
3011 | ||
3012 | impl<'hir> OwnerNode<'hir> { | |
3013 | pub fn ident(&self) -> Option<Ident> { | |
3014 | match self { | |
3015 | OwnerNode::Item(Item { ident, .. }) | |
3016 | | OwnerNode::ForeignItem(ForeignItem { ident, .. }) | |
3017 | | OwnerNode::ImplItem(ImplItem { ident, .. }) | |
3018 | | OwnerNode::TraitItem(TraitItem { ident, .. }) => Some(*ident), | |
3019 | OwnerNode::Crate(..) => None, | |
3020 | } | |
3021 | } | |
3022 | ||
3023 | pub fn span(&self) -> Span { | |
3024 | match self { | |
3025 | OwnerNode::Item(Item { span, .. }) | |
3026 | | OwnerNode::ForeignItem(ForeignItem { span, .. }) | |
3027 | | OwnerNode::ImplItem(ImplItem { span, .. }) | |
3028 | | OwnerNode::TraitItem(TraitItem { span, .. }) | |
3029 | | OwnerNode::Crate(Mod { inner: span, .. }) => *span, | |
3030 | } | |
3031 | } | |
3032 | ||
3033 | pub fn fn_decl(&self) -> Option<&FnDecl<'hir>> { | |
3034 | match self { | |
3035 | OwnerNode::TraitItem(TraitItem { kind: TraitItemKind::Fn(fn_sig, _), .. }) | |
3036 | | OwnerNode::ImplItem(ImplItem { kind: ImplItemKind::Fn(fn_sig, _), .. }) | |
3037 | | OwnerNode::Item(Item { kind: ItemKind::Fn(fn_sig, _, _), .. }) => Some(fn_sig.decl), | |
3038 | OwnerNode::ForeignItem(ForeignItem { | |
3039 | kind: ForeignItemKind::Fn(fn_decl, _, _), | |
3040 | .. | |
3041 | }) => Some(fn_decl), | |
3042 | _ => None, | |
3043 | } | |
3044 | } | |
3045 | ||
3046 | pub fn body_id(&self) -> Option<BodyId> { | |
3047 | match self { | |
3048 | OwnerNode::TraitItem(TraitItem { | |
3049 | kind: TraitItemKind::Fn(_, TraitFn::Provided(body_id)), | |
3050 | .. | |
3051 | }) | |
3052 | | OwnerNode::ImplItem(ImplItem { kind: ImplItemKind::Fn(_, body_id), .. }) | |
3053 | | OwnerNode::Item(Item { kind: ItemKind::Fn(.., body_id), .. }) => Some(*body_id), | |
3054 | _ => None, | |
3055 | } | |
3056 | } | |
3057 | ||
3058 | pub fn generics(&self) -> Option<&'hir Generics<'hir>> { | |
3059 | match self { | |
3060 | OwnerNode::TraitItem(TraitItem { generics, .. }) | |
3061 | | OwnerNode::ImplItem(ImplItem { generics, .. }) => Some(generics), | |
3062 | OwnerNode::Item(item) => item.kind.generics(), | |
3063 | _ => None, | |
3064 | } | |
3065 | } | |
3066 | ||
3067 | pub fn def_id(self) -> LocalDefId { | |
3068 | match self { | |
3069 | OwnerNode::Item(Item { def_id, .. }) | |
3070 | | OwnerNode::TraitItem(TraitItem { def_id, .. }) | |
3071 | | OwnerNode::ImplItem(ImplItem { def_id, .. }) | |
3072 | | OwnerNode::ForeignItem(ForeignItem { def_id, .. }) => *def_id, | |
3073 | OwnerNode::Crate(..) => crate::CRATE_HIR_ID.owner, | |
3074 | } | |
3075 | } | |
3076 | ||
3077 | pub fn expect_item(self) -> &'hir Item<'hir> { | |
3078 | match self { | |
3079 | OwnerNode::Item(n) => n, | |
3080 | _ => panic!(), | |
3081 | } | |
3082 | } | |
3083 | ||
3084 | pub fn expect_foreign_item(self) -> &'hir ForeignItem<'hir> { | |
3085 | match self { | |
3086 | OwnerNode::ForeignItem(n) => n, | |
3087 | _ => panic!(), | |
3088 | } | |
3089 | } | |
3090 | ||
3091 | pub fn expect_impl_item(self) -> &'hir ImplItem<'hir> { | |
3092 | match self { | |
3093 | OwnerNode::ImplItem(n) => n, | |
3094 | _ => panic!(), | |
3095 | } | |
3096 | } | |
3097 | ||
3098 | pub fn expect_trait_item(self) -> &'hir TraitItem<'hir> { | |
3099 | match self { | |
3100 | OwnerNode::TraitItem(n) => n, | |
3101 | _ => panic!(), | |
3102 | } | |
3103 | } | |
3104 | } | |
3105 | ||
3106 | impl<'hir> Into<OwnerNode<'hir>> for &'hir Item<'hir> { | |
3107 | fn into(self) -> OwnerNode<'hir> { | |
3108 | OwnerNode::Item(self) | |
3109 | } | |
3110 | } | |
3111 | ||
3112 | impl<'hir> Into<OwnerNode<'hir>> for &'hir ForeignItem<'hir> { | |
3113 | fn into(self) -> OwnerNode<'hir> { | |
3114 | OwnerNode::ForeignItem(self) | |
3115 | } | |
3116 | } | |
3117 | ||
3118 | impl<'hir> Into<OwnerNode<'hir>> for &'hir ImplItem<'hir> { | |
3119 | fn into(self) -> OwnerNode<'hir> { | |
3120 | OwnerNode::ImplItem(self) | |
3121 | } | |
3122 | } | |
3123 | ||
3124 | impl<'hir> Into<OwnerNode<'hir>> for &'hir TraitItem<'hir> { | |
3125 | fn into(self) -> OwnerNode<'hir> { | |
3126 | OwnerNode::TraitItem(self) | |
3127 | } | |
3128 | } | |
3129 | ||
3130 | impl<'hir> Into<Node<'hir>> for OwnerNode<'hir> { | |
3131 | fn into(self) -> Node<'hir> { | |
3132 | match self { | |
3133 | OwnerNode::Item(n) => Node::Item(n), | |
3134 | OwnerNode::ForeignItem(n) => Node::ForeignItem(n), | |
3135 | OwnerNode::ImplItem(n) => Node::ImplItem(n), | |
3136 | OwnerNode::TraitItem(n) => Node::TraitItem(n), | |
3137 | OwnerNode::Crate(n) => Node::Crate(n), | |
3138 | } | |
3139 | } | |
3140 | } | |
3141 | ||
ba9703b0 | 3142 | #[derive(Copy, Clone, Debug, HashStable_Generic)] |
dfeec247 XL |
3143 | pub enum Node<'hir> { |
3144 | Param(&'hir Param<'hir>), | |
3145 | Item(&'hir Item<'hir>), | |
3146 | ForeignItem(&'hir ForeignItem<'hir>), | |
3147 | TraitItem(&'hir TraitItem<'hir>), | |
3148 | ImplItem(&'hir ImplItem<'hir>), | |
3149 | Variant(&'hir Variant<'hir>), | |
6a06907d | 3150 | Field(&'hir FieldDef<'hir>), |
dfeec247 XL |
3151 | AnonConst(&'hir AnonConst), |
3152 | Expr(&'hir Expr<'hir>), | |
3153 | Stmt(&'hir Stmt<'hir>), | |
3154 | PathSegment(&'hir PathSegment<'hir>), | |
3155 | Ty(&'hir Ty<'hir>), | |
3156 | TraitRef(&'hir TraitRef<'hir>), | |
3157 | Binding(&'hir Pat<'hir>), | |
3158 | Pat(&'hir Pat<'hir>), | |
3159 | Arm(&'hir Arm<'hir>), | |
3160 | Block(&'hir Block<'hir>), | |
3161 | Local(&'hir Local<'hir>), | |
dfeec247 XL |
3162 | |
3163 | /// `Ctor` refers to the constructor of an enum variant or struct. Only tuple or unit variants | |
3164 | /// with synthesized constructors. | |
3165 | Ctor(&'hir VariantData<'hir>), | |
3166 | ||
3167 | Lifetime(&'hir Lifetime), | |
3168 | GenericParam(&'hir GenericParam<'hir>), | |
3169 | Visibility(&'hir Visibility<'hir>), | |
3170 | ||
cdc7bbd5 | 3171 | Crate(&'hir Mod<'hir>), |
94222f64 XL |
3172 | |
3173 | Infer(&'hir InferArg), | |
dfeec247 XL |
3174 | } |
3175 | ||
3dfed10e | 3176 | impl<'hir> Node<'hir> { |
94222f64 XL |
3177 | /// Get the identifier of this `Node`, if applicable. |
3178 | /// | |
3179 | /// # Edge cases | |
3180 | /// | |
3181 | /// Calling `.ident()` on a [`Node::Ctor`] will return `None` | |
3182 | /// because `Ctor`s do not have identifiers themselves. | |
3183 | /// Instead, call `.ident()` on the parent struct/variant, like so: | |
3184 | /// | |
3185 | /// ```ignore (illustrative) | |
3186 | /// ctor | |
3187 | /// .ctor_hir_id() | |
3188 | /// .and_then(|ctor_id| tcx.hir().find(tcx.hir().get_parent_node(ctor_id))) | |
3189 | /// .and_then(|parent| parent.ident()) | |
3190 | /// ``` | |
dfeec247 XL |
3191 | pub fn ident(&self) -> Option<Ident> { |
3192 | match self { | |
3193 | Node::TraitItem(TraitItem { ident, .. }) | |
3194 | | Node::ImplItem(ImplItem { ident, .. }) | |
3195 | | Node::ForeignItem(ForeignItem { ident, .. }) | |
6a06907d | 3196 | | Node::Field(FieldDef { ident, .. }) |
29967ef6 | 3197 | | Node::Variant(Variant { ident, .. }) |
94222f64 XL |
3198 | | Node::Item(Item { ident, .. }) |
3199 | | Node::PathSegment(PathSegment { ident, .. }) => Some(*ident), | |
3200 | Node::Lifetime(lt) => Some(lt.name.ident()), | |
3201 | Node::GenericParam(p) => Some(p.name.ident()), | |
3202 | Node::Param(..) | |
3203 | | Node::AnonConst(..) | |
3204 | | Node::Expr(..) | |
3205 | | Node::Stmt(..) | |
3206 | | Node::Block(..) | |
3207 | | Node::Ctor(..) | |
3208 | | Node::Pat(..) | |
3209 | | Node::Binding(..) | |
3210 | | Node::Arm(..) | |
3211 | | Node::Local(..) | |
3212 | | Node::Visibility(..) | |
3213 | | Node::Crate(..) | |
3214 | | Node::Ty(..) | |
3215 | | Node::TraitRef(..) | |
3216 | | Node::Infer(..) => None, | |
dfeec247 XL |
3217 | } |
3218 | } | |
74b04a01 | 3219 | |
5099ac24 | 3220 | pub fn fn_decl(&self) -> Option<&'hir FnDecl<'hir>> { |
74b04a01 | 3221 | match self { |
ba9703b0 XL |
3222 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(fn_sig, _), .. }) |
3223 | | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(fn_sig, _), .. }) | |
74b04a01 XL |
3224 | | Node::Item(Item { kind: ItemKind::Fn(fn_sig, _, _), .. }) => Some(fn_sig.decl), |
3225 | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(fn_decl, _, _), .. }) => { | |
3226 | Some(fn_decl) | |
3227 | } | |
3228 | _ => None, | |
3229 | } | |
3230 | } | |
3231 | ||
5099ac24 FG |
3232 | pub fn fn_sig(&self) -> Option<&'hir FnSig<'hir>> { |
3233 | match self { | |
3234 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(fn_sig, _), .. }) | |
3235 | | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(fn_sig, _), .. }) | |
3236 | | Node::Item(Item { kind: ItemKind::Fn(fn_sig, _, _), .. }) => Some(fn_sig), | |
3237 | _ => None, | |
3238 | } | |
3239 | } | |
3240 | ||
f035d41b XL |
3241 | pub fn body_id(&self) -> Option<BodyId> { |
3242 | match self { | |
3243 | Node::TraitItem(TraitItem { | |
3244 | kind: TraitItemKind::Fn(_, TraitFn::Provided(body_id)), | |
3245 | .. | |
3246 | }) | |
3247 | | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(_, body_id), .. }) | |
3248 | | Node::Item(Item { kind: ItemKind::Fn(.., body_id), .. }) => Some(*body_id), | |
3249 | _ => None, | |
3250 | } | |
3251 | } | |
3252 | ||
3dfed10e | 3253 | pub fn generics(&self) -> Option<&'hir Generics<'hir>> { |
74b04a01 XL |
3254 | match self { |
3255 | Node::TraitItem(TraitItem { generics, .. }) | |
f035d41b XL |
3256 | | Node::ImplItem(ImplItem { generics, .. }) => Some(generics), |
3257 | Node::Item(item) => item.kind.generics(), | |
74b04a01 XL |
3258 | _ => None, |
3259 | } | |
3260 | } | |
f9f354fc | 3261 | |
94222f64 XL |
3262 | pub fn as_owner(self) -> Option<OwnerNode<'hir>> { |
3263 | match self { | |
3264 | Node::Item(i) => Some(OwnerNode::Item(i)), | |
3265 | Node::ForeignItem(i) => Some(OwnerNode::ForeignItem(i)), | |
3266 | Node::TraitItem(i) => Some(OwnerNode::TraitItem(i)), | |
3267 | Node::ImplItem(i) => Some(OwnerNode::ImplItem(i)), | |
3268 | Node::Crate(i) => Some(OwnerNode::Crate(i)), | |
3269 | _ => None, | |
3270 | } | |
3271 | } | |
3c0e092e XL |
3272 | |
3273 | pub fn fn_kind(self) -> Option<FnKind<'hir>> { | |
3274 | match self { | |
3275 | Node::Item(i) => match i.kind { | |
3276 | ItemKind::Fn(ref sig, ref generics, _) => { | |
3277 | Some(FnKind::ItemFn(i.ident, generics, sig.header, &i.vis)) | |
3278 | } | |
3279 | _ => None, | |
3280 | }, | |
3281 | Node::TraitItem(ti) => match ti.kind { | |
3282 | TraitItemKind::Fn(ref sig, TraitFn::Provided(_)) => { | |
3283 | Some(FnKind::Method(ti.ident, sig, None)) | |
3284 | } | |
3285 | _ => None, | |
3286 | }, | |
3287 | Node::ImplItem(ii) => match ii.kind { | |
3288 | ImplItemKind::Fn(ref sig, _) => Some(FnKind::Method(ii.ident, sig, Some(&ii.vis))), | |
3289 | _ => None, | |
3290 | }, | |
3291 | Node::Expr(e) => match e.kind { | |
3292 | ExprKind::Closure(..) => Some(FnKind::Closure), | |
3293 | _ => None, | |
3294 | }, | |
3295 | _ => None, | |
3296 | } | |
3297 | } | |
dfeec247 | 3298 | } |
6a06907d XL |
3299 | |
3300 | // Some nodes are used a lot. Make sure they don't unintentionally get bigger. | |
3301 | #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))] | |
3302 | mod size_asserts { | |
3303 | rustc_data_structures::static_assert_size!(super::Block<'static>, 48); | |
5099ac24 | 3304 | rustc_data_structures::static_assert_size!(super::Expr<'static>, 56); |
6a06907d XL |
3305 | rustc_data_structures::static_assert_size!(super::Pat<'static>, 88); |
3306 | rustc_data_structures::static_assert_size!(super::QPath<'static>, 24); | |
a2a8927a | 3307 | rustc_data_structures::static_assert_size!(super::Ty<'static>, 80); |
6a06907d XL |
3308 | |
3309 | rustc_data_structures::static_assert_size!(super::Item<'static>, 184); | |
3310 | rustc_data_structures::static_assert_size!(super::TraitItem<'static>, 128); | |
5099ac24 | 3311 | rustc_data_structures::static_assert_size!(super::ImplItem<'static>, 144); |
6a06907d XL |
3312 | rustc_data_structures::static_assert_size!(super::ForeignItem<'static>, 136); |
3313 | } |