| use crate::def::{DefKind, Res}; |
| use crate::def_id::DefId; |
| crate use crate::hir_id::HirId; |
| use crate::itemlikevisit; |
| use crate::print; |
| |
| crate use BlockCheckMode::*; |
| crate use FunctionRetTy::*; |
| crate use UnsafeSource::*; |
| |
| use rustc_data_structures::fx::FxHashSet; |
| use rustc_data_structures::sync::{par_for_each_in, Send, Sync}; |
| use rustc_errors::FatalError; |
| use rustc_macros::HashStable_Generic; |
| use rustc_session::node_id::NodeMap; |
| use rustc_span::source_map::{SourceMap, Spanned}; |
| use rustc_span::symbol::{kw, sym, Symbol}; |
| use rustc_span::{MultiSpan, Span, DUMMY_SP}; |
| use rustc_target::spec::abi::Abi; |
| use smallvec::SmallVec; |
| use std::collections::{BTreeMap, BTreeSet}; |
| use std::fmt; |
| use syntax::ast::{self, AsmDialect, CrateSugar, Ident, Name, NodeId}; |
| use syntax::ast::{AttrVec, Attribute, FloatTy, IntTy, Label, LitKind, StrStyle, UintTy}; |
| pub use syntax::ast::{BorrowKind, ImplPolarity, IsAuto}; |
| pub use syntax::ast::{CaptureBy, Constness, Movability, Mutability, Unsafety}; |
| use syntax::tokenstream::TokenStream; |
| use syntax::util::parser::ExprPrecedence; |
| |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub struct Lifetime { |
| pub hir_id: HirId, |
| pub span: Span, |
| |
| /// Either "`'a`", referring to a named lifetime definition, |
| /// or "``" (i.e., `kw::Invalid`), for elision placeholders. |
| /// |
| /// HIR lowering inserts these placeholders in type paths that |
| /// refer to type definitions needing lifetime parameters, |
| /// `&T` and `&mut T`, and trait objects without `... + 'a`. |
| pub name: LifetimeName, |
| } |
| |
| #[derive(Debug, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)] |
| #[derive(HashStable_Generic)] |
| pub enum ParamName { |
| /// Some user-given name like `T` or `'x`. |
| Plain(Ident), |
| |
| /// Synthetic name generated when user elided a lifetime in an impl header. |
| /// |
| /// E.g., the lifetimes in cases like these: |
| /// |
| /// impl Foo for &u32 |
| /// impl Foo<'_> for u32 |
| /// |
| /// in that case, we rewrite to |
| /// |
| /// impl<'f> Foo for &'f u32 |
| /// impl<'f> Foo<'f> for u32 |
| /// |
| /// where `'f` is something like `Fresh(0)`. The indices are |
| /// unique per impl, but not necessarily continuous. |
| Fresh(usize), |
| |
| /// Indicates an illegal name was given and an error has been |
| /// reported (so we should squelch other derived errors). Occurs |
| /// when, e.g., `'_` is used in the wrong place. |
| Error, |
| } |
| |
| impl ParamName { |
| pub fn ident(&self) -> Ident { |
| match *self { |
| ParamName::Plain(ident) => ident, |
| ParamName::Fresh(_) | ParamName::Error => { |
| Ident::with_dummy_span(kw::UnderscoreLifetime) |
| } |
| } |
| } |
| |
| pub fn modern(&self) -> ParamName { |
| match *self { |
| ParamName::Plain(ident) => ParamName::Plain(ident.modern()), |
| param_name => param_name, |
| } |
| } |
| } |
| |
| #[derive(Debug, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)] |
| #[derive(HashStable_Generic)] |
| pub enum LifetimeName { |
| /// User-given names or fresh (synthetic) names. |
| Param(ParamName), |
| |
| /// User wrote nothing (e.g., the lifetime in `&u32`). |
| Implicit, |
| |
| /// Implicit lifetime in a context like `dyn Foo`. This is |
| /// distinguished from implicit lifetimes elsewhere because the |
| /// lifetime that they default to must appear elsewhere within the |
| /// enclosing type. This means that, in an `impl Trait` context, we |
| /// don't have to create a parameter for them. That is, `impl |
| /// Trait<Item = &u32>` expands to an opaque type like `type |
| /// Foo<'a> = impl Trait<Item = &'a u32>`, but `impl Trait<item = |
| /// dyn Bar>` expands to `type Foo = impl Trait<Item = dyn Bar + |
| /// 'static>`. The latter uses `ImplicitObjectLifetimeDefault` so |
| /// that surrounding code knows not to create a lifetime |
| /// parameter. |
| ImplicitObjectLifetimeDefault, |
| |
| /// Indicates an error during lowering (usually `'_` in wrong place) |
| /// that was already reported. |
| Error, |
| |
| /// User wrote specifies `'_`. |
| Underscore, |
| |
| /// User wrote `'static`. |
| Static, |
| } |
| |
| impl LifetimeName { |
| pub fn ident(&self) -> Ident { |
| match *self { |
| LifetimeName::ImplicitObjectLifetimeDefault |
| | LifetimeName::Implicit |
| | LifetimeName::Error => Ident::invalid(), |
| LifetimeName::Underscore => Ident::with_dummy_span(kw::UnderscoreLifetime), |
| LifetimeName::Static => Ident::with_dummy_span(kw::StaticLifetime), |
| LifetimeName::Param(param_name) => param_name.ident(), |
| } |
| } |
| |
| pub fn is_elided(&self) -> bool { |
| match self { |
| LifetimeName::ImplicitObjectLifetimeDefault |
| | LifetimeName::Implicit |
| | LifetimeName::Underscore => true, |
| |
| // It might seem surprising that `Fresh(_)` counts as |
| // *not* elided -- but this is because, as far as the code |
| // in the compiler is concerned -- `Fresh(_)` variants act |
| // equivalently to "some fresh name". They correspond to |
| // early-bound regions on an impl, in other words. |
| LifetimeName::Error | LifetimeName::Param(_) | LifetimeName::Static => false, |
| } |
| } |
| |
| fn is_static(&self) -> bool { |
| self == &LifetimeName::Static |
| } |
| |
| pub fn modern(&self) -> LifetimeName { |
| match *self { |
| LifetimeName::Param(param_name) => LifetimeName::Param(param_name.modern()), |
| lifetime_name => lifetime_name, |
| } |
| } |
| } |
| |
| impl fmt::Display for Lifetime { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| self.name.ident().fmt(f) |
| } |
| } |
| |
| impl fmt::Debug for Lifetime { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!( |
| f, |
| "lifetime({}: {})", |
| self.hir_id, |
| print::to_string(print::NO_ANN, |s| s.print_lifetime(self)) |
| ) |
| } |
| } |
| |
| impl Lifetime { |
| pub fn is_elided(&self) -> bool { |
| self.name.is_elided() |
| } |
| |
| pub fn is_static(&self) -> bool { |
| self.name.is_static() |
| } |
| } |
| |
| /// A `Path` is essentially Rust's notion of a name; for instance, |
| /// `std::cmp::PartialEq`. It's represented as a sequence of identifiers, |
| /// along with a bunch of supporting information. |
| #[derive(RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub struct Path<'hir> { |
| pub span: Span, |
| /// The resolution for the path. |
| pub res: Res, |
| /// The segments in the path: the things separated by `::`. |
| pub segments: &'hir [PathSegment<'hir>], |
| } |
| |
| impl Path<'_> { |
| pub fn is_global(&self) -> bool { |
| !self.segments.is_empty() && self.segments[0].ident.name == kw::PathRoot |
| } |
| } |
| |
| impl fmt::Debug for Path<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "path({})", self) |
| } |
| } |
| |
| impl fmt::Display for Path<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "{}", print::to_string(print::NO_ANN, |s| s.print_path(self, false))) |
| } |
| } |
| |
| /// A segment of a path: an identifier, an optional lifetime, and a set of |
| /// types. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct PathSegment<'hir> { |
| /// The identifier portion of this path segment. |
| #[stable_hasher(project(name))] |
| pub ident: Ident, |
| // `id` and `res` are optional. We currently only use these in save-analysis, |
| // any path segments without these will not have save-analysis info and |
| // therefore will not have 'jump to def' in IDEs, but otherwise will not be |
| // affected. (In general, we don't bother to get the defs for synthesized |
| // segments, only for segments which have come from the AST). |
| pub hir_id: Option<HirId>, |
| pub res: Option<Res>, |
| |
| /// Type/lifetime parameters attached to this path. They come in |
| /// two flavors: `Path<A,B,C>` and `Path(A,B) -> C`. Note that |
| /// this is more than just simple syntactic sugar; the use of |
| /// parens affects the region binding rules, so we preserve the |
| /// distinction. |
| pub args: Option<&'hir GenericArgs<'hir>>, |
| |
| /// Whether to infer remaining type parameters, if any. |
| /// This only applies to expression and pattern paths, and |
| /// out of those only the segments with no type parameters |
| /// to begin with, e.g., `Vec::new` is `<Vec<..>>::new::<..>`. |
| pub infer_args: bool, |
| } |
| |
| impl<'hir> PathSegment<'hir> { |
| /// Converts an identifier to the corresponding segment. |
| pub fn from_ident(ident: Ident) -> PathSegment<'hir> { |
| PathSegment { ident, hir_id: None, res: None, infer_args: true, args: None } |
| } |
| |
| pub fn generic_args(&self) -> &GenericArgs<'hir> { |
| if let Some(ref args) = self.args { |
| args |
| } else { |
| const DUMMY: &GenericArgs<'_> = &GenericArgs::none(); |
| DUMMY |
| } |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct ConstArg { |
| pub value: AnonConst, |
| pub span: Span, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum GenericArg<'hir> { |
| Lifetime(Lifetime), |
| Type(Ty<'hir>), |
| Const(ConstArg), |
| } |
| |
| impl GenericArg<'_> { |
| pub fn span(&self) -> Span { |
| match self { |
| GenericArg::Lifetime(l) => l.span, |
| GenericArg::Type(t) => t.span, |
| GenericArg::Const(c) => c.span, |
| } |
| } |
| |
| pub fn id(&self) -> HirId { |
| match self { |
| GenericArg::Lifetime(l) => l.hir_id, |
| GenericArg::Type(t) => t.hir_id, |
| GenericArg::Const(c) => c.value.hir_id, |
| } |
| } |
| |
| pub fn is_const(&self) -> bool { |
| match self { |
| GenericArg::Const(_) => true, |
| _ => false, |
| } |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct GenericArgs<'hir> { |
| /// The generic arguments for this path segment. |
| pub args: &'hir [GenericArg<'hir>], |
| /// Bindings (equality constraints) on associated types, if present. |
| /// E.g., `Foo<A = Bar>`. |
| pub bindings: &'hir [TypeBinding<'hir>], |
| /// Were arguments written in parenthesized form `Fn(T) -> U`? |
| /// This is required mostly for pretty-printing and diagnostics, |
| /// but also for changing lifetime elision rules to be "function-like". |
| pub parenthesized: bool, |
| } |
| |
| impl GenericArgs<'_> { |
| pub const fn none() -> Self { |
| Self { args: &[], bindings: &[], parenthesized: false } |
| } |
| |
| pub fn is_empty(&self) -> bool { |
| self.args.is_empty() && self.bindings.is_empty() && !self.parenthesized |
| } |
| |
| pub fn inputs(&self) -> &[Ty<'_>] { |
| if self.parenthesized { |
| for arg in self.args { |
| match arg { |
| GenericArg::Lifetime(_) => {} |
| GenericArg::Type(ref ty) => { |
| if let TyKind::Tup(ref tys) = ty.kind { |
| return tys; |
| } |
| break; |
| } |
| GenericArg::Const(_) => {} |
| } |
| } |
| } |
| panic!("GenericArgs::inputs: not a `Fn(T) -> U`"); |
| } |
| |
| pub fn own_counts(&self) -> GenericParamCount { |
| // We could cache this as a property of `GenericParamCount`, but |
| // the aim is to refactor this away entirely eventually and the |
| // presence of this method will be a constant reminder. |
| let mut own_counts: GenericParamCount = Default::default(); |
| |
| for arg in self.args { |
| match arg { |
| GenericArg::Lifetime(_) => own_counts.lifetimes += 1, |
| GenericArg::Type(_) => own_counts.types += 1, |
| GenericArg::Const(_) => own_counts.consts += 1, |
| }; |
| } |
| |
| own_counts |
| } |
| } |
| |
| /// A modifier on a bound, currently this is only used for `?Sized`, where the |
| /// modifier is `Maybe`. Negative bounds should also be handled here. |
| #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)] |
| #[derive(HashStable_Generic)] |
| pub enum TraitBoundModifier { |
| None, |
| Maybe, |
| } |
| |
| /// The AST represents all type param bounds as types. |
| /// `typeck::collect::compute_bounds` matches these against |
| /// the "special" built-in traits (see `middle::lang_items`) and |
| /// detects `Copy`, `Send` and `Sync`. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum GenericBound<'hir> { |
| Trait(PolyTraitRef<'hir>, TraitBoundModifier), |
| Outlives(Lifetime), |
| } |
| |
| impl GenericBound<'_> { |
| pub fn span(&self) -> Span { |
| match self { |
| &GenericBound::Trait(ref t, ..) => t.span, |
| &GenericBound::Outlives(ref l) => l.span, |
| } |
| } |
| } |
| |
| pub type GenericBounds<'hir> = &'hir [GenericBound<'hir>]; |
| |
| #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum LifetimeParamKind { |
| // Indicates that the lifetime definition was explicitly declared (e.g., in |
| // `fn foo<'a>(x: &'a u8) -> &'a u8 { x }`). |
| Explicit, |
| |
| // Indicates that the lifetime definition was synthetically added |
| // as a result of an in-band lifetime usage (e.g., in |
| // `fn foo(x: &'a u8) -> &'a u8 { x }`). |
| InBand, |
| |
| // Indication that the lifetime was elided (e.g., in both cases in |
| // `fn foo(x: &u8) -> &'_ u8 { x }`). |
| Elided, |
| |
| // Indication that the lifetime name was somehow in error. |
| Error, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum GenericParamKind<'hir> { |
| /// A lifetime definition (e.g., `'a: 'b + 'c + 'd`). |
| Lifetime { |
| kind: LifetimeParamKind, |
| }, |
| Type { |
| default: Option<&'hir Ty<'hir>>, |
| synthetic: Option<SyntheticTyParamKind>, |
| }, |
| Const { |
| ty: &'hir Ty<'hir>, |
| }, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct GenericParam<'hir> { |
| pub hir_id: HirId, |
| pub name: ParamName, |
| pub attrs: &'hir [Attribute], |
| pub bounds: GenericBounds<'hir>, |
| pub span: Span, |
| pub pure_wrt_drop: bool, |
| pub kind: GenericParamKind<'hir>, |
| } |
| |
| #[derive(Default)] |
| pub struct GenericParamCount { |
| pub lifetimes: usize, |
| pub types: usize, |
| pub consts: usize, |
| } |
| |
| /// Represents lifetimes and type parameters attached to a declaration |
| /// of a function, enum, trait, etc. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Generics<'hir> { |
| pub params: &'hir [GenericParam<'hir>], |
| pub where_clause: WhereClause<'hir>, |
| pub span: Span, |
| } |
| |
| impl Generics<'hir> { |
| pub const fn empty() -> Generics<'hir> { |
| Generics { |
| params: &[], |
| where_clause: WhereClause { predicates: &[], span: DUMMY_SP }, |
| span: DUMMY_SP, |
| } |
| } |
| |
| pub fn own_counts(&self) -> GenericParamCount { |
| // We could cache this as a property of `GenericParamCount`, but |
| // the aim is to refactor this away entirely eventually and the |
| // presence of this method will be a constant reminder. |
| let mut own_counts: GenericParamCount = Default::default(); |
| |
| for param in self.params { |
| match param.kind { |
| GenericParamKind::Lifetime { .. } => own_counts.lifetimes += 1, |
| GenericParamKind::Type { .. } => own_counts.types += 1, |
| GenericParamKind::Const { .. } => own_counts.consts += 1, |
| }; |
| } |
| |
| own_counts |
| } |
| |
| pub fn get_named(&self, name: Symbol) -> Option<&GenericParam<'_>> { |
| for param in self.params { |
| if name == param.name.ident().name { |
| return Some(param); |
| } |
| } |
| None |
| } |
| |
| pub fn spans(&self) -> MultiSpan { |
| if self.params.is_empty() { |
| self.span.into() |
| } else { |
| self.params.iter().map(|p| p.span).collect::<Vec<Span>>().into() |
| } |
| } |
| } |
| |
| /// Synthetic type parameters are converted to another form during lowering; this allows |
| /// us to track the original form they had, and is useful for error messages. |
| #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)] |
| #[derive(HashStable_Generic)] |
| pub enum SyntheticTyParamKind { |
| ImplTrait, |
| } |
| |
| /// A where-clause in a definition. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct WhereClause<'hir> { |
| pub predicates: &'hir [WherePredicate<'hir>], |
| // Only valid if predicates isn't empty. |
| pub span: Span, |
| } |
| |
| impl WhereClause<'_> { |
| pub fn span(&self) -> Option<Span> { |
| if self.predicates.is_empty() { None } else { Some(self.span) } |
| } |
| |
| /// The `WhereClause` under normal circumstances points at either the predicates or the empty |
| /// space where the `where` clause should be. Only of use for diagnostic suggestions. |
| pub fn span_for_predicates_or_empty_place(&self) -> Span { |
| self.span |
| } |
| } |
| |
| /// A single predicate in a where-clause. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum WherePredicate<'hir> { |
| /// A type binding (e.g., `for<'c> Foo: Send + Clone + 'c`). |
| BoundPredicate(WhereBoundPredicate<'hir>), |
| /// A lifetime predicate (e.g., `'a: 'b + 'c`). |
| RegionPredicate(WhereRegionPredicate<'hir>), |
| /// An equality predicate (unsupported). |
| EqPredicate(WhereEqPredicate<'hir>), |
| } |
| |
| impl WherePredicate<'_> { |
| pub fn span(&self) -> Span { |
| match self { |
| &WherePredicate::BoundPredicate(ref p) => p.span, |
| &WherePredicate::RegionPredicate(ref p) => p.span, |
| &WherePredicate::EqPredicate(ref p) => p.span, |
| } |
| } |
| } |
| |
| /// A type bound (e.g., `for<'c> Foo: Send + Clone + 'c`). |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct WhereBoundPredicate<'hir> { |
| pub span: Span, |
| /// Any generics from a `for` binding. |
| pub bound_generic_params: &'hir [GenericParam<'hir>], |
| /// The type being bounded. |
| pub bounded_ty: &'hir Ty<'hir>, |
| /// Trait and lifetime bounds (e.g., `Clone + Send + 'static`). |
| pub bounds: GenericBounds<'hir>, |
| } |
| |
| /// A lifetime predicate (e.g., `'a: 'b + 'c`). |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct WhereRegionPredicate<'hir> { |
| pub span: Span, |
| pub lifetime: Lifetime, |
| pub bounds: GenericBounds<'hir>, |
| } |
| |
| /// An equality predicate (e.g., `T = int`); currently unsupported. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct WhereEqPredicate<'hir> { |
| pub hir_id: HirId, |
| pub span: Span, |
| pub lhs_ty: &'hir Ty<'hir>, |
| pub rhs_ty: &'hir Ty<'hir>, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug)] |
| pub struct ModuleItems { |
| // Use BTreeSets here so items are in the same order as in the |
| // list of all items in Crate |
| pub items: BTreeSet<HirId>, |
| pub trait_items: BTreeSet<TraitItemId>, |
| pub impl_items: BTreeSet<ImplItemId>, |
| } |
| |
| /// The top-level data structure that stores the entire contents of |
| /// the crate currently being compiled. |
| /// |
| /// For more details, see the [rustc guide]. |
| /// |
| /// [rustc guide]: https://rust-lang.github.io/rustc-guide/hir.html |
| #[derive(RustcEncodable, RustcDecodable, Debug)] |
| pub struct Crate<'hir> { |
| pub module: Mod<'hir>, |
| pub attrs: &'hir [Attribute], |
| pub span: Span, |
| pub exported_macros: &'hir [MacroDef<'hir>], |
| // Attributes from non-exported macros, kept only for collecting the library feature list. |
| pub non_exported_macro_attrs: &'hir [Attribute], |
| |
| // N.B., we use a `BTreeMap` here so that `visit_all_items` iterates |
| // over the ids in increasing order. In principle it should not |
| // matter what order we visit things in, but in *practice* it |
| // does, because it can affect the order in which errors are |
| // detected, which in turn can make compile-fail tests yield |
| // slightly different results. |
| pub items: BTreeMap<HirId, Item<'hir>>, |
| |
| pub trait_items: BTreeMap<TraitItemId, TraitItem<'hir>>, |
| pub impl_items: BTreeMap<ImplItemId, ImplItem<'hir>>, |
| pub bodies: BTreeMap<BodyId, Body<'hir>>, |
| pub trait_impls: BTreeMap<DefId, Vec<HirId>>, |
| |
| /// A list of the body ids written out in the order in which they |
| /// appear in the crate. If you're going to process all the bodies |
| /// in the crate, you should iterate over this list rather than the keys |
| /// of bodies. |
| pub body_ids: Vec<BodyId>, |
| |
| /// A list of modules written out in the order in which they |
| /// appear in the crate. This includes the main crate module. |
| pub modules: BTreeMap<HirId, ModuleItems>, |
| } |
| |
| impl Crate<'hir> { |
| pub fn item(&self, id: HirId) -> &Item<'hir> { |
| &self.items[&id] |
| } |
| |
| pub fn trait_item(&self, id: TraitItemId) -> &TraitItem<'hir> { |
| &self.trait_items[&id] |
| } |
| |
| pub fn impl_item(&self, id: ImplItemId) -> &ImplItem<'hir> { |
| &self.impl_items[&id] |
| } |
| |
| pub fn body(&self, id: BodyId) -> &Body<'hir> { |
| &self.bodies[&id] |
| } |
| } |
| |
| impl Crate<'_> { |
| /// Visits all items in the crate in some deterministic (but |
| /// unspecified) order. If you just need to process every item, |
| /// but don't care about nesting, this method is the best choice. |
| /// |
| /// If you do care about nesting -- usually because your algorithm |
| /// follows lexical scoping rules -- then you want a different |
| /// approach. You should override `visit_nested_item` in your |
| /// visitor and then call `intravisit::walk_crate` instead. |
| pub fn visit_all_item_likes<'hir, V>(&'hir self, visitor: &mut V) |
| where |
| V: itemlikevisit::ItemLikeVisitor<'hir>, |
| { |
| for (_, item) in &self.items { |
| visitor.visit_item(item); |
| } |
| |
| for (_, trait_item) in &self.trait_items { |
| visitor.visit_trait_item(trait_item); |
| } |
| |
| for (_, impl_item) in &self.impl_items { |
| visitor.visit_impl_item(impl_item); |
| } |
| } |
| |
| /// A parallel version of `visit_all_item_likes`. |
| pub fn par_visit_all_item_likes<'hir, V>(&'hir self, visitor: &V) |
| where |
| V: itemlikevisit::ParItemLikeVisitor<'hir> + Sync + Send, |
| { |
| parallel!( |
| { |
| par_for_each_in(&self.items, |(_, item)| { |
| visitor.visit_item(item); |
| }); |
| }, |
| { |
| par_for_each_in(&self.trait_items, |(_, trait_item)| { |
| visitor.visit_trait_item(trait_item); |
| }); |
| }, |
| { |
| par_for_each_in(&self.impl_items, |(_, impl_item)| { |
| visitor.visit_impl_item(impl_item); |
| }); |
| } |
| ); |
| } |
| } |
| |
| /// A macro definition, in this crate or imported from another. |
| /// |
| /// Not parsed directly, but created on macro import or `macro_rules!` expansion. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct MacroDef<'hir> { |
| pub name: Name, |
| pub vis: Visibility<'hir>, |
| pub attrs: &'hir [Attribute], |
| pub hir_id: HirId, |
| pub span: Span, |
| pub body: TokenStream, |
| pub legacy: bool, |
| } |
| |
| /// A block of statements `{ .. }`, which may have a label (in this case the |
| /// `targeted_by_break` field will be `true`) and may be `unsafe` by means of |
| /// the `rules` being anything but `DefaultBlock`. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Block<'hir> { |
| /// Statements in a block. |
| pub stmts: &'hir [Stmt<'hir>], |
| /// An expression at the end of the block |
| /// without a semicolon, if any. |
| pub expr: Option<&'hir Expr<'hir>>, |
| #[stable_hasher(ignore)] |
| pub hir_id: HirId, |
| /// Distinguishes between `unsafe { ... }` and `{ ... }`. |
| pub rules: BlockCheckMode, |
| pub span: Span, |
| /// If true, then there may exist `break 'a` values that aim to |
| /// break out of this block early. |
| /// Used by `'label: {}` blocks and by `try {}` blocks. |
| pub targeted_by_break: bool, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub struct Pat<'hir> { |
| #[stable_hasher(ignore)] |
| pub hir_id: HirId, |
| pub kind: PatKind<'hir>, |
| pub span: Span, |
| } |
| |
| impl fmt::Debug for Pat<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!( |
| f, |
| "pat({}: {})", |
| self.hir_id, |
| print::to_string(print::NO_ANN, |s| s.print_pat(self)) |
| ) |
| } |
| } |
| |
| impl Pat<'_> { |
| // FIXME(#19596) this is a workaround, but there should be a better way |
| fn walk_short_(&self, it: &mut impl FnMut(&Pat<'_>) -> bool) -> bool { |
| if !it(self) { |
| return false; |
| } |
| |
| use PatKind::*; |
| match &self.kind { |
| Wild | Lit(_) | Range(..) | Binding(.., None) | Path(_) => true, |
| Box(s) | Ref(s, _) | Binding(.., Some(s)) => s.walk_short_(it), |
| Struct(_, fields, _) => fields.iter().all(|field| field.pat.walk_short_(it)), |
| TupleStruct(_, s, _) | Tuple(s, _) | Or(s) => s.iter().all(|p| p.walk_short_(it)), |
| Slice(before, slice, after) => { |
| before.iter().chain(slice.iter()).chain(after.iter()).all(|p| p.walk_short_(it)) |
| } |
| } |
| } |
| |
| /// Walk the pattern in left-to-right order, |
| /// short circuiting (with `.all(..)`) if `false` is returned. |
| /// |
| /// Note that when visiting e.g. `Tuple(ps)`, |
| /// if visiting `ps[0]` returns `false`, |
| /// then `ps[1]` will not be visited. |
| pub fn walk_short(&self, mut it: impl FnMut(&Pat<'_>) -> bool) -> bool { |
| self.walk_short_(&mut it) |
| } |
| |
| // FIXME(#19596) this is a workaround, but there should be a better way |
| fn walk_(&self, it: &mut impl FnMut(&Pat<'_>) -> bool) { |
| if !it(self) { |
| return; |
| } |
| |
| use PatKind::*; |
| match &self.kind { |
| Wild | Lit(_) | Range(..) | Binding(.., None) | Path(_) => {} |
| Box(s) | Ref(s, _) | Binding(.., Some(s)) => s.walk_(it), |
| Struct(_, fields, _) => fields.iter().for_each(|field| field.pat.walk_(it)), |
| TupleStruct(_, s, _) | Tuple(s, _) | Or(s) => s.iter().for_each(|p| p.walk_(it)), |
| Slice(before, slice, after) => { |
| before.iter().chain(slice.iter()).chain(after.iter()).for_each(|p| p.walk_(it)) |
| } |
| } |
| } |
| |
| /// Walk the pattern in left-to-right order. |
| /// |
| /// If `it(pat)` returns `false`, the children are not visited. |
| pub fn walk(&self, mut it: impl FnMut(&Pat<'_>) -> bool) { |
| self.walk_(&mut it) |
| } |
| |
| /// Walk the pattern in left-to-right order. |
| /// |
| /// If you always want to recurse, prefer this method over `walk`. |
| pub fn walk_always(&self, mut it: impl FnMut(&Pat<'_>)) { |
| self.walk(|p| { |
| it(p); |
| true |
| }) |
| } |
| } |
| |
| /// A single field in a struct pattern. |
| /// |
| /// Patterns like the fields of Foo `{ x, ref y, ref mut z }` |
| /// are treated the same as` x: x, y: ref y, z: ref mut z`, |
| /// except `is_shorthand` is true. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct FieldPat<'hir> { |
| #[stable_hasher(ignore)] |
| pub hir_id: HirId, |
| /// The identifier for the field. |
| #[stable_hasher(project(name))] |
| pub ident: Ident, |
| /// The pattern the field is destructured to. |
| pub pat: &'hir Pat<'hir>, |
| pub is_shorthand: bool, |
| pub span: Span, |
| } |
| |
| /// Explicit binding annotations given in the HIR for a binding. Note |
| /// that this is not the final binding *mode* that we infer after type |
| /// inference. |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum BindingAnnotation { |
| /// No binding annotation given: this means that the final binding mode |
| /// will depend on whether we have skipped through a `&` reference |
| /// when matching. For example, the `x` in `Some(x)` will have binding |
| /// mode `None`; if you do `let Some(x) = &Some(22)`, it will |
| /// ultimately be inferred to be by-reference. |
| /// |
| /// Note that implicit reference skipping is not implemented yet (#42640). |
| Unannotated, |
| |
| /// Annotated with `mut x` -- could be either ref or not, similar to `None`. |
| Mutable, |
| |
| /// Annotated as `ref`, like `ref x` |
| Ref, |
| |
| /// Annotated as `ref mut x`. |
| RefMut, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum RangeEnd { |
| Included, |
| Excluded, |
| } |
| |
| impl fmt::Display for RangeEnd { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| f.write_str(match self { |
| RangeEnd::Included => "..=", |
| RangeEnd::Excluded => "..", |
| }) |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum PatKind<'hir> { |
| /// Represents a wildcard pattern (i.e., `_`). |
| Wild, |
| |
| /// A fresh binding `ref mut binding @ OPT_SUBPATTERN`. |
| /// The `HirId` is the canonical ID for the variable being bound, |
| /// (e.g., in `Ok(x) | Err(x)`, both `x` use the same canonical ID), |
| /// which is the pattern ID of the first `x`. |
| Binding(BindingAnnotation, HirId, Ident, Option<&'hir Pat<'hir>>), |
| |
| /// A struct or struct variant pattern (e.g., `Variant {x, y, ..}`). |
| /// The `bool` is `true` in the presence of a `..`. |
| Struct(QPath<'hir>, &'hir [FieldPat<'hir>], bool), |
| |
| /// A tuple struct/variant pattern `Variant(x, y, .., z)`. |
| /// If the `..` pattern fragment is present, then `Option<usize>` denotes its position. |
| /// `0 <= position <= subpats.len()` |
| TupleStruct(QPath<'hir>, &'hir [&'hir Pat<'hir>], Option<usize>), |
| |
| /// An or-pattern `A | B | C`. |
| /// Invariant: `pats.len() >= 2`. |
| Or(&'hir [&'hir Pat<'hir>]), |
| |
| /// A path pattern for an unit struct/variant or a (maybe-associated) constant. |
| Path(QPath<'hir>), |
| |
| /// A tuple pattern (e.g., `(a, b)`). |
| /// If the `..` pattern fragment is present, then `Option<usize>` denotes its position. |
| /// `0 <= position <= subpats.len()` |
| Tuple(&'hir [&'hir Pat<'hir>], Option<usize>), |
| |
| /// A `box` pattern. |
| Box(&'hir Pat<'hir>), |
| |
| /// A reference pattern (e.g., `&mut (a, b)`). |
| Ref(&'hir Pat<'hir>, Mutability), |
| |
| /// A literal. |
| Lit(&'hir Expr<'hir>), |
| |
| /// A range pattern (e.g., `1..=2` or `1..2`). |
| Range(Option<&'hir Expr<'hir>>, Option<&'hir Expr<'hir>>, RangeEnd), |
| |
| /// A slice pattern, `[before_0, ..., before_n, (slice, after_0, ..., after_n)?]`. |
| /// |
| /// Here, `slice` is lowered from the syntax `($binding_mode $ident @)? ..`. |
| /// If `slice` exists, then `after` can be non-empty. |
| /// |
| /// The representation for e.g., `[a, b, .., c, d]` is: |
| /// ``` |
| /// PatKind::Slice([Binding(a), Binding(b)], Some(Wild), [Binding(c), Binding(d)]) |
| /// ``` |
| Slice(&'hir [&'hir Pat<'hir>], Option<&'hir Pat<'hir>>, &'hir [&'hir Pat<'hir>]), |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum BinOpKind { |
| /// The `+` operator (addition). |
| Add, |
| /// The `-` operator (subtraction). |
| Sub, |
| /// The `*` operator (multiplication). |
| Mul, |
| /// The `/` operator (division). |
| Div, |
| /// The `%` operator (modulus). |
| Rem, |
| /// The `&&` operator (logical and). |
| And, |
| /// The `||` operator (logical or). |
| Or, |
| /// The `^` operator (bitwise xor). |
| BitXor, |
| /// The `&` operator (bitwise and). |
| BitAnd, |
| /// The `|` operator (bitwise or). |
| BitOr, |
| /// The `<<` operator (shift left). |
| Shl, |
| /// The `>>` operator (shift right). |
| Shr, |
| /// The `==` operator (equality). |
| Eq, |
| /// The `<` operator (less than). |
| Lt, |
| /// The `<=` operator (less than or equal to). |
| Le, |
| /// The `!=` operator (not equal to). |
| Ne, |
| /// The `>=` operator (greater than or equal to). |
| Ge, |
| /// The `>` operator (greater than). |
| Gt, |
| } |
| |
| impl BinOpKind { |
| pub fn as_str(self) -> &'static str { |
| match self { |
| BinOpKind::Add => "+", |
| BinOpKind::Sub => "-", |
| BinOpKind::Mul => "*", |
| BinOpKind::Div => "/", |
| BinOpKind::Rem => "%", |
| BinOpKind::And => "&&", |
| BinOpKind::Or => "||", |
| BinOpKind::BitXor => "^", |
| BinOpKind::BitAnd => "&", |
| BinOpKind::BitOr => "|", |
| BinOpKind::Shl => "<<", |
| BinOpKind::Shr => ">>", |
| BinOpKind::Eq => "==", |
| BinOpKind::Lt => "<", |
| BinOpKind::Le => "<=", |
| BinOpKind::Ne => "!=", |
| BinOpKind::Ge => ">=", |
| BinOpKind::Gt => ">", |
| } |
| } |
| |
| pub fn is_lazy(self) -> bool { |
| match self { |
| BinOpKind::And | BinOpKind::Or => true, |
| _ => false, |
| } |
| } |
| |
| pub fn is_shift(self) -> bool { |
| match self { |
| BinOpKind::Shl | BinOpKind::Shr => true, |
| _ => false, |
| } |
| } |
| |
| pub fn is_comparison(self) -> bool { |
| match self { |
| BinOpKind::Eq |
| | BinOpKind::Lt |
| | BinOpKind::Le |
| | BinOpKind::Ne |
| | BinOpKind::Gt |
| | BinOpKind::Ge => true, |
| BinOpKind::And |
| | BinOpKind::Or |
| | BinOpKind::Add |
| | BinOpKind::Sub |
| | BinOpKind::Mul |
| | BinOpKind::Div |
| | BinOpKind::Rem |
| | BinOpKind::BitXor |
| | BinOpKind::BitAnd |
| | BinOpKind::BitOr |
| | BinOpKind::Shl |
| | BinOpKind::Shr => false, |
| } |
| } |
| |
| /// Returns `true` if the binary operator takes its arguments by value. |
| pub fn is_by_value(self) -> bool { |
| !self.is_comparison() |
| } |
| } |
| |
| impl Into<ast::BinOpKind> for BinOpKind { |
| fn into(self) -> ast::BinOpKind { |
| match self { |
| BinOpKind::Add => ast::BinOpKind::Add, |
| BinOpKind::Sub => ast::BinOpKind::Sub, |
| BinOpKind::Mul => ast::BinOpKind::Mul, |
| BinOpKind::Div => ast::BinOpKind::Div, |
| BinOpKind::Rem => ast::BinOpKind::Rem, |
| BinOpKind::And => ast::BinOpKind::And, |
| BinOpKind::Or => ast::BinOpKind::Or, |
| BinOpKind::BitXor => ast::BinOpKind::BitXor, |
| BinOpKind::BitAnd => ast::BinOpKind::BitAnd, |
| BinOpKind::BitOr => ast::BinOpKind::BitOr, |
| BinOpKind::Shl => ast::BinOpKind::Shl, |
| BinOpKind::Shr => ast::BinOpKind::Shr, |
| BinOpKind::Eq => ast::BinOpKind::Eq, |
| BinOpKind::Lt => ast::BinOpKind::Lt, |
| BinOpKind::Le => ast::BinOpKind::Le, |
| BinOpKind::Ne => ast::BinOpKind::Ne, |
| BinOpKind::Ge => ast::BinOpKind::Ge, |
| BinOpKind::Gt => ast::BinOpKind::Gt, |
| } |
| } |
| } |
| |
| pub type BinOp = Spanned<BinOpKind>; |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum UnOp { |
| /// The `*` operator (deferencing). |
| UnDeref, |
| /// The `!` operator (logical negation). |
| UnNot, |
| /// The `-` operator (negation). |
| UnNeg, |
| } |
| |
| impl UnOp { |
| pub fn as_str(self) -> &'static str { |
| match self { |
| Self::UnDeref => "*", |
| Self::UnNot => "!", |
| Self::UnNeg => "-", |
| } |
| } |
| |
| /// Returns `true` if the unary operator takes its argument by value. |
| pub fn is_by_value(self) -> bool { |
| match self { |
| Self::UnNeg | Self::UnNot => true, |
| _ => false, |
| } |
| } |
| } |
| |
| /// A statement. |
| #[derive(RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub struct Stmt<'hir> { |
| pub hir_id: HirId, |
| pub kind: StmtKind<'hir>, |
| pub span: Span, |
| } |
| |
| impl fmt::Debug for Stmt<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!( |
| f, |
| "stmt({}: {})", |
| self.hir_id, |
| print::to_string(print::NO_ANN, |s| s.print_stmt(self)) |
| ) |
| } |
| } |
| |
| /// The contents of a statement. |
| #[derive(RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub enum StmtKind<'hir> { |
| /// A local (`let`) binding. |
| Local(&'hir Local<'hir>), |
| |
| /// An item binding. |
| Item(ItemId), |
| |
| /// An expression without a trailing semi-colon (must have unit type). |
| Expr(&'hir Expr<'hir>), |
| |
| /// An expression with a trailing semi-colon (may have any type). |
| Semi(&'hir Expr<'hir>), |
| } |
| |
| impl StmtKind<'hir> { |
| pub fn attrs(&self) -> &'hir [Attribute] { |
| match *self { |
| StmtKind::Local(ref l) => &l.attrs, |
| StmtKind::Item(_) => &[], |
| StmtKind::Expr(ref e) | StmtKind::Semi(ref e) => &e.attrs, |
| } |
| } |
| } |
| |
| /// Represents a `let` statement (i.e., `let <pat>:<ty> = <expr>;`). |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Local<'hir> { |
| pub pat: &'hir Pat<'hir>, |
| /// Type annotation, if any (otherwise the type will be inferred). |
| pub ty: Option<&'hir Ty<'hir>>, |
| /// Initializer expression to set the value, if any. |
| pub init: Option<&'hir Expr<'hir>>, |
| pub hir_id: HirId, |
| pub span: Span, |
| pub attrs: AttrVec, |
| /// Can be `ForLoopDesugar` if the `let` statement is part of a `for` loop |
| /// desugaring. Otherwise will be `Normal`. |
| pub source: LocalSource, |
| } |
| |
| /// Represents a single arm of a `match` expression, e.g. |
| /// `<pat> (if <guard>) => <body>`. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Arm<'hir> { |
| #[stable_hasher(ignore)] |
| pub hir_id: HirId, |
| pub span: Span, |
| pub attrs: &'hir [Attribute], |
| /// If this pattern and the optional guard matches, then `body` is evaluated. |
| pub pat: &'hir Pat<'hir>, |
| /// Optional guard clause. |
| pub guard: Option<Guard<'hir>>, |
| /// The expression the arm evaluates to if this arm matches. |
| pub body: &'hir Expr<'hir>, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum Guard<'hir> { |
| If(&'hir Expr<'hir>), |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Field<'hir> { |
| #[stable_hasher(ignore)] |
| pub hir_id: HirId, |
| pub ident: Ident, |
| pub expr: &'hir Expr<'hir>, |
| pub span: Span, |
| pub is_shorthand: bool, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum BlockCheckMode { |
| DefaultBlock, |
| UnsafeBlock(UnsafeSource), |
| PushUnsafeBlock(UnsafeSource), |
| PopUnsafeBlock(UnsafeSource), |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum UnsafeSource { |
| CompilerGenerated, |
| UserProvided, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, RustcEncodable, RustcDecodable, Hash, Debug)] |
| pub struct BodyId { |
| pub hir_id: HirId, |
| } |
| |
| /// The body of a function, closure, or constant value. In the case of |
| /// a function, the body contains not only the function body itself |
| /// (which is an expression), but also the argument patterns, since |
| /// those are something that the caller doesn't really care about. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// fn foo((x, y): (u32, u32)) -> u32 { |
| /// x + y |
| /// } |
| /// ``` |
| /// |
| /// Here, the `Body` associated with `foo()` would contain: |
| /// |
| /// - an `params` array containing the `(x, y)` pattern |
| /// - a `value` containing the `x + y` expression (maybe wrapped in a block) |
| /// - `generator_kind` would be `None` |
| /// |
| /// All bodies have an **owner**, which can be accessed via the HIR |
| /// map using `body_owner_def_id()`. |
| #[derive(RustcEncodable, RustcDecodable, Debug)] |
| pub struct Body<'hir> { |
| pub params: &'hir [Param<'hir>], |
| pub value: Expr<'hir>, |
| pub generator_kind: Option<GeneratorKind>, |
| } |
| |
| impl Body<'hir> { |
| pub fn id(&self) -> BodyId { |
| BodyId { hir_id: self.value.hir_id } |
| } |
| |
| pub fn generator_kind(&self) -> Option<GeneratorKind> { |
| self.generator_kind |
| } |
| } |
| |
| /// The type of source expression that caused this generator to be created. |
| #[derive(Clone, PartialEq, Eq, HashStable_Generic, RustcEncodable, RustcDecodable, Debug, Copy)] |
| pub enum GeneratorKind { |
| /// An explicit `async` block or the body of an async function. |
| Async(AsyncGeneratorKind), |
| |
| /// A generator literal created via a `yield` inside a closure. |
| Gen, |
| } |
| |
| impl fmt::Display for GeneratorKind { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| match self { |
| GeneratorKind::Async(k) => fmt::Display::fmt(k, f), |
| GeneratorKind::Gen => f.write_str("generator"), |
| } |
| } |
| } |
| |
| /// In the case of a generator created as part of an async construct, |
| /// which kind of async construct caused it to be created? |
| /// |
| /// This helps error messages but is also used to drive coercions in |
| /// type-checking (see #60424). |
| #[derive(Clone, PartialEq, Eq, HashStable_Generic, RustcEncodable, RustcDecodable, Debug, Copy)] |
| pub enum AsyncGeneratorKind { |
| /// An explicit `async` block written by the user. |
| Block, |
| |
| /// An explicit `async` block written by the user. |
| Closure, |
| |
| /// The `async` block generated as the body of an async function. |
| Fn, |
| } |
| |
| impl fmt::Display for AsyncGeneratorKind { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| f.write_str(match self { |
| AsyncGeneratorKind::Block => "`async` block", |
| AsyncGeneratorKind::Closure => "`async` closure body", |
| AsyncGeneratorKind::Fn => "`async fn` body", |
| }) |
| } |
| } |
| |
| #[derive(Copy, Clone, Debug)] |
| pub enum BodyOwnerKind { |
| /// Functions and methods. |
| Fn, |
| |
| /// Closures |
| Closure, |
| |
| /// Constants and associated constants. |
| Const, |
| |
| /// Initializer of a `static` item. |
| Static(Mutability), |
| } |
| |
| impl BodyOwnerKind { |
| pub fn is_fn_or_closure(self) -> bool { |
| match self { |
| BodyOwnerKind::Fn | BodyOwnerKind::Closure => true, |
| BodyOwnerKind::Const | BodyOwnerKind::Static(_) => false, |
| } |
| } |
| } |
| |
| /// A literal. |
| pub type Lit = Spanned<LitKind>; |
| |
| /// A constant (expression) that's not an item or associated item, |
| /// but needs its own `DefId` for type-checking, const-eval, etc. |
| /// These are usually found nested inside types (e.g., array lengths) |
| /// or expressions (e.g., repeat counts), and also used to define |
| /// explicit discriminant values for enum variants. |
| #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct AnonConst { |
| pub hir_id: HirId, |
| pub body: BodyId, |
| } |
| |
| /// An expression. |
| #[derive(RustcEncodable, RustcDecodable)] |
| pub struct Expr<'hir> { |
| pub hir_id: HirId, |
| pub kind: ExprKind<'hir>, |
| pub attrs: AttrVec, |
| pub span: Span, |
| } |
| |
| // `Expr` is used a lot. Make sure it doesn't unintentionally get bigger. |
| #[cfg(target_arch = "x86_64")] |
| rustc_data_structures::static_assert_size!(Expr<'static>, 64); |
| |
| impl Expr<'_> { |
| pub fn precedence(&self) -> ExprPrecedence { |
| match self.kind { |
| ExprKind::Box(_) => ExprPrecedence::Box, |
| ExprKind::Array(_) => ExprPrecedence::Array, |
| ExprKind::Call(..) => ExprPrecedence::Call, |
| ExprKind::MethodCall(..) => ExprPrecedence::MethodCall, |
| ExprKind::Tup(_) => ExprPrecedence::Tup, |
| ExprKind::Binary(op, ..) => ExprPrecedence::Binary(op.node.into()), |
| ExprKind::Unary(..) => ExprPrecedence::Unary, |
| ExprKind::Lit(_) => ExprPrecedence::Lit, |
| ExprKind::Type(..) | ExprKind::Cast(..) => ExprPrecedence::Cast, |
| ExprKind::DropTemps(ref expr, ..) => expr.precedence(), |
| ExprKind::Loop(..) => ExprPrecedence::Loop, |
| ExprKind::Match(..) => ExprPrecedence::Match, |
| ExprKind::Closure(..) => ExprPrecedence::Closure, |
| ExprKind::Block(..) => ExprPrecedence::Block, |
| ExprKind::Assign(..) => ExprPrecedence::Assign, |
| ExprKind::AssignOp(..) => ExprPrecedence::AssignOp, |
| ExprKind::Field(..) => ExprPrecedence::Field, |
| ExprKind::Index(..) => ExprPrecedence::Index, |
| ExprKind::Path(..) => ExprPrecedence::Path, |
| ExprKind::AddrOf(..) => ExprPrecedence::AddrOf, |
| ExprKind::Break(..) => ExprPrecedence::Break, |
| ExprKind::Continue(..) => ExprPrecedence::Continue, |
| ExprKind::Ret(..) => ExprPrecedence::Ret, |
| ExprKind::InlineAsm(..) => ExprPrecedence::InlineAsm, |
| ExprKind::Struct(..) => ExprPrecedence::Struct, |
| ExprKind::Repeat(..) => ExprPrecedence::Repeat, |
| ExprKind::Yield(..) => ExprPrecedence::Yield, |
| ExprKind::Err => ExprPrecedence::Err, |
| } |
| } |
| |
| // Whether this looks like a place expr, without checking for deref |
| // adjustments. |
| // This will return `true` in some potentially surprising cases such as |
| // `CONSTANT.field`. |
| pub fn is_syntactic_place_expr(&self) -> bool { |
| self.is_place_expr(|_| true) |
| } |
| |
| // Whether this is a place expression. |
| // `allow_projections_from` should return `true` if indexing a field or |
| // index expression based on the given expression should be considered a |
| // place expression. |
| pub fn is_place_expr(&self, mut allow_projections_from: impl FnMut(&Self) -> bool) -> bool { |
| match self.kind { |
| ExprKind::Path(QPath::Resolved(_, ref path)) => match path.res { |
| Res::Local(..) | Res::Def(DefKind::Static, _) | Res::Err => true, |
| _ => false, |
| }, |
| |
| // Type ascription inherits its place expression kind from its |
| // operand. See: |
| // https://github.com/rust-lang/rfcs/blob/master/text/0803-type-ascription.md#type-ascription-and-temporaries |
| ExprKind::Type(ref e, _) => e.is_place_expr(allow_projections_from), |
| |
| ExprKind::Unary(UnOp::UnDeref, _) => true, |
| |
| ExprKind::Field(ref base, _) | ExprKind::Index(ref base, _) => { |
| allow_projections_from(base) || base.is_place_expr(allow_projections_from) |
| } |
| |
| // Partially qualified paths in expressions can only legally |
| // refer to associated items which are always rvalues. |
| ExprKind::Path(QPath::TypeRelative(..)) |
| | ExprKind::Call(..) |
| | ExprKind::MethodCall(..) |
| | ExprKind::Struct(..) |
| | ExprKind::Tup(..) |
| | ExprKind::Match(..) |
| | ExprKind::Closure(..) |
| | ExprKind::Block(..) |
| | ExprKind::Repeat(..) |
| | ExprKind::Array(..) |
| | ExprKind::Break(..) |
| | ExprKind::Continue(..) |
| | ExprKind::Ret(..) |
| | ExprKind::Loop(..) |
| | ExprKind::Assign(..) |
| | ExprKind::InlineAsm(..) |
| | ExprKind::AssignOp(..) |
| | ExprKind::Lit(_) |
| | ExprKind::Unary(..) |
| | ExprKind::Box(..) |
| | ExprKind::AddrOf(..) |
| | ExprKind::Binary(..) |
| | ExprKind::Yield(..) |
| | ExprKind::Cast(..) |
| | ExprKind::DropTemps(..) |
| | ExprKind::Err => false, |
| } |
| } |
| |
| /// If `Self.kind` is `ExprKind::DropTemps(expr)`, drill down until we get a non-`DropTemps` |
| /// `Expr`. This is used in suggestions to ignore this `ExprKind` as it is semantically |
| /// silent, only signaling the ownership system. By doing this, suggestions that check the |
| /// `ExprKind` of any given `Expr` for presentation don't have to care about `DropTemps` |
| /// beyond remembering to call this function before doing analysis on it. |
| pub fn peel_drop_temps(&self) -> &Self { |
| let mut expr = self; |
| while let ExprKind::DropTemps(inner) = &expr.kind { |
| expr = inner; |
| } |
| expr |
| } |
| } |
| |
| impl fmt::Debug for Expr<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!( |
| f, |
| "expr({}: {})", |
| self.hir_id, |
| print::to_string(print::NO_ANN, |s| s.print_expr(self)) |
| ) |
| } |
| } |
| |
| /// Checks if the specified expression is a built-in range literal. |
| /// (See: `LoweringContext::lower_expr()`). |
| /// |
| /// FIXME(#60607): This function is a hack. If and when we have `QPath::Lang(...)`, |
| /// we can use that instead as simpler, more reliable mechanism, as opposed to using `SourceMap`. |
| pub fn is_range_literal(sm: &SourceMap, expr: &Expr<'_>) -> bool { |
| // Returns whether the given path represents a (desugared) range, |
| // either in std or core, i.e. has either a `::std::ops::Range` or |
| // `::core::ops::Range` prefix. |
| fn is_range_path(path: &Path<'_>) -> bool { |
| let segs: Vec<_> = path.segments.iter().map(|seg| seg.ident.to_string()).collect(); |
| let segs: Vec<_> = segs.iter().map(|seg| &**seg).collect(); |
| |
| // "{{root}}" is the equivalent of `::` prefix in `Path`. |
| if let ["{{root}}", std_core, "ops", range] = segs.as_slice() { |
| (*std_core == "std" || *std_core == "core") && range.starts_with("Range") |
| } else { |
| false |
| } |
| }; |
| |
| // Check whether a span corresponding to a range expression is a |
| // range literal, rather than an explicit struct or `new()` call. |
| fn is_lit(sm: &SourceMap, span: &Span) -> bool { |
| let end_point = sm.end_point(*span); |
| |
| if let Ok(end_string) = sm.span_to_snippet(end_point) { |
| !(end_string.ends_with("}") || end_string.ends_with(")")) |
| } else { |
| false |
| } |
| }; |
| |
| match expr.kind { |
| // All built-in range literals but `..=` and `..` desugar to `Struct`s. |
| ExprKind::Struct(ref qpath, _, _) => { |
| if let QPath::Resolved(None, ref path) = **qpath { |
| return is_range_path(&path) && is_lit(sm, &expr.span); |
| } |
| } |
| |
| // `..` desugars to its struct path. |
| ExprKind::Path(QPath::Resolved(None, ref path)) => { |
| return is_range_path(&path) && is_lit(sm, &expr.span); |
| } |
| |
| // `..=` desugars into `::std::ops::RangeInclusive::new(...)`. |
| ExprKind::Call(ref func, _) => { |
| if let ExprKind::Path(QPath::TypeRelative(ref ty, ref segment)) = func.kind { |
| if let TyKind::Path(QPath::Resolved(None, ref path)) = ty.kind { |
| let new_call = segment.ident.name == sym::new; |
| return is_range_path(&path) && is_lit(sm, &expr.span) && new_call; |
| } |
| } |
| } |
| |
| _ => {} |
| } |
| |
| false |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum ExprKind<'hir> { |
| /// A `box x` expression. |
| Box(&'hir Expr<'hir>), |
| /// An array (e.g., `[a, b, c, d]`). |
| Array(&'hir [Expr<'hir>]), |
| /// A function call. |
| /// |
| /// The first field resolves to the function itself (usually an `ExprKind::Path`), |
| /// and the second field is the list of arguments. |
| /// This also represents calling the constructor of |
| /// tuple-like ADTs such as tuple structs and enum variants. |
| Call(&'hir Expr<'hir>, &'hir [Expr<'hir>]), |
| /// A method call (e.g., `x.foo::<'static, Bar, Baz>(a, b, c, d)`). |
| /// |
| /// The `PathSegment`/`Span` represent the method name and its generic arguments |
| /// (within the angle brackets). |
| /// The first element of the vector of `Expr`s is the expression that evaluates |
| /// to the object on which the method is being called on (the receiver), |
| /// and the remaining elements are the rest of the arguments. |
| /// Thus, `x.foo::<Bar, Baz>(a, b, c, d)` is represented as |
| /// `ExprKind::MethodCall(PathSegment { foo, [Bar, Baz] }, [x, a, b, c, d])`. |
| /// |
| /// To resolve the called method to a `DefId`, call [`type_dependent_def_id`] with |
| /// the `hir_id` of the `MethodCall` node itself. |
| /// |
| /// [`type_dependent_def_id`]: ../ty/struct.TypeckTables.html#method.type_dependent_def_id |
| MethodCall(&'hir PathSegment<'hir>, Span, &'hir [Expr<'hir>]), |
| /// A tuple (e.g., `(a, b, c, d)`). |
| Tup(&'hir [Expr<'hir>]), |
| /// A binary operation (e.g., `a + b`, `a * b`). |
| Binary(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>), |
| /// A unary operation (e.g., `!x`, `*x`). |
| Unary(UnOp, &'hir Expr<'hir>), |
| /// A literal (e.g., `1`, `"foo"`). |
| Lit(Lit), |
| /// A cast (e.g., `foo as f64`). |
| Cast(&'hir Expr<'hir>, &'hir Ty<'hir>), |
| /// A type reference (e.g., `Foo`). |
| Type(&'hir Expr<'hir>, &'hir Ty<'hir>), |
| /// Wraps the expression in a terminating scope. |
| /// This makes it semantically equivalent to `{ let _t = expr; _t }`. |
| /// |
| /// This construct only exists to tweak the drop order in HIR lowering. |
| /// An example of that is the desugaring of `for` loops. |
| DropTemps(&'hir Expr<'hir>), |
| /// A conditionless loop (can be exited with `break`, `continue`, or `return`). |
| /// |
| /// I.e., `'label: loop { <block> }`. |
| Loop(&'hir Block<'hir>, Option<Label>, LoopSource), |
| /// A `match` block, with a source that indicates whether or not it is |
| /// the result of a desugaring, and if so, which kind. |
| Match(&'hir Expr<'hir>, &'hir [Arm<'hir>], MatchSource), |
| /// A closure (e.g., `move |a, b, c| {a + b + c}`). |
| /// |
| /// The `Span` is the argument block `|...|`. |
| /// |
| /// This may also be a generator literal or an `async block` as indicated by the |
| /// `Option<Movability>`. |
| Closure(CaptureBy, &'hir FnDecl<'hir>, BodyId, Span, Option<Movability>), |
| /// A block (e.g., `'label: { ... }`). |
| Block(&'hir Block<'hir>, Option<Label>), |
| |
| /// An assignment (e.g., `a = foo()`). |
| Assign(&'hir Expr<'hir>, &'hir Expr<'hir>, Span), |
| /// An assignment with an operator. |
| /// |
| /// E.g., `a += 1`. |
| AssignOp(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>), |
| /// Access of a named (e.g., `obj.foo`) or unnamed (e.g., `obj.0`) struct or tuple field. |
| Field(&'hir Expr<'hir>, Ident), |
| /// An indexing operation (`foo[2]`). |
| Index(&'hir Expr<'hir>, &'hir Expr<'hir>), |
| |
| /// Path to a definition, possibly containing lifetime or type parameters. |
| Path(QPath<'hir>), |
| |
| /// A referencing operation (i.e., `&a` or `&mut a`). |
| AddrOf(BorrowKind, Mutability, &'hir Expr<'hir>), |
| /// A `break`, with an optional label to break. |
| Break(Destination, Option<&'hir Expr<'hir>>), |
| /// A `continue`, with an optional label. |
| Continue(Destination), |
| /// A `return`, with an optional value to be returned. |
| Ret(Option<&'hir Expr<'hir>>), |
| |
| /// Inline assembly (from `asm!`), with its outputs and inputs. |
| InlineAsm(&'hir InlineAsm<'hir>), |
| |
| /// A struct or struct-like variant literal expression. |
| /// |
| /// E.g., `Foo {x: 1, y: 2}`, or `Foo {x: 1, .. base}`, |
| /// where `base` is the `Option<Expr>`. |
| Struct(&'hir QPath<'hir>, &'hir [Field<'hir>], Option<&'hir Expr<'hir>>), |
| |
| /// An array literal constructed from one repeated element. |
| /// |
| /// E.g., `[1; 5]`. The first expression is the element |
| /// to be repeated; the second is the number of times to repeat it. |
| Repeat(&'hir Expr<'hir>, AnonConst), |
| |
| /// A suspension point for generators (i.e., `yield <expr>`). |
| Yield(&'hir Expr<'hir>, YieldSource), |
| |
| /// A placeholder for an expression that wasn't syntactically well formed in some way. |
| Err, |
| } |
| |
| /// Represents an optionally `Self`-qualified value/type path or associated extension. |
| /// |
| /// To resolve the path to a `DefId`, call [`qpath_res`]. |
| /// |
| /// [`qpath_res`]: ../ty/struct.TypeckTables.html#method.qpath_res |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum QPath<'hir> { |
| /// Path to a definition, optionally "fully-qualified" with a `Self` |
| /// type, if the path points to an associated item in a trait. |
| /// |
| /// E.g., an unqualified path like `Clone::clone` has `None` for `Self`, |
| /// while `<Vec<T> as Clone>::clone` has `Some(Vec<T>)` for `Self`, |
| /// even though they both have the same two-segment `Clone::clone` `Path`. |
| Resolved(Option<&'hir Ty<'hir>>, &'hir Path<'hir>), |
| |
| /// Type-related paths (e.g., `<T>::default` or `<T>::Output`). |
| /// Will be resolved by type-checking to an associated item. |
| /// |
| /// UFCS source paths can desugar into this, with `Vec::new` turning into |
| /// `<Vec>::new`, and `T::X::Y::method` into `<<<T>::X>::Y>::method`, |
| /// the `X` and `Y` nodes each being a `TyKind::Path(QPath::TypeRelative(..))`. |
| TypeRelative(&'hir Ty<'hir>, &'hir PathSegment<'hir>), |
| } |
| |
| /// Hints at the original code for a let statement. |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum LocalSource { |
| /// A `match _ { .. }`. |
| Normal, |
| /// A desugared `for _ in _ { .. }` loop. |
| ForLoopDesugar, |
| /// When lowering async functions, we create locals within the `async move` so that |
| /// all parameters are dropped after the future is polled. |
| /// |
| /// ```ignore (pseudo-Rust) |
| /// async fn foo(<pattern> @ x: Type) { |
| /// async move { |
| /// let <pattern> = x; |
| /// } |
| /// } |
| /// ``` |
| AsyncFn, |
| /// A desugared `<expr>.await`. |
| AwaitDesugar, |
| } |
| |
| /// Hints at the original code for a `match _ { .. }`. |
| #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)] |
| #[derive(HashStable_Generic)] |
| pub enum MatchSource { |
| /// A `match _ { .. }`. |
| Normal, |
| /// An `if _ { .. }` (optionally with `else { .. }`). |
| IfDesugar { contains_else_clause: bool }, |
| /// An `if let _ = _ { .. }` (optionally with `else { .. }`). |
| IfLetDesugar { contains_else_clause: bool }, |
| /// A `while _ { .. }` (which was desugared to a `loop { match _ { .. } }`). |
| WhileDesugar, |
| /// A `while let _ = _ { .. }` (which was desugared to a |
| /// `loop { match _ { .. } }`). |
| WhileLetDesugar, |
| /// A desugared `for _ in _ { .. }` loop. |
| ForLoopDesugar, |
| /// A desugared `?` operator. |
| TryDesugar, |
| /// A desugared `<expr>.await`. |
| AwaitDesugar, |
| } |
| |
| impl MatchSource { |
| pub fn name(self) -> &'static str { |
| use MatchSource::*; |
| match self { |
| Normal => "match", |
| IfDesugar { .. } | IfLetDesugar { .. } => "if", |
| WhileDesugar | WhileLetDesugar => "while", |
| ForLoopDesugar => "for", |
| TryDesugar => "?", |
| AwaitDesugar => ".await", |
| } |
| } |
| } |
| |
| /// The loop type that yielded an `ExprKind::Loop`. |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum LoopSource { |
| /// A `loop { .. }` loop. |
| Loop, |
| /// A `while _ { .. }` loop. |
| While, |
| /// A `while let _ = _ { .. }` loop. |
| WhileLet, |
| /// A `for _ in _ { .. }` loop. |
| ForLoop, |
| } |
| |
| impl LoopSource { |
| pub fn name(self) -> &'static str { |
| match self { |
| LoopSource::Loop => "loop", |
| LoopSource::While | LoopSource::WhileLet => "while", |
| LoopSource::ForLoop => "for", |
| } |
| } |
| } |
| |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum LoopIdError { |
| OutsideLoopScope, |
| UnlabeledCfInWhileCondition, |
| UnresolvedLabel, |
| } |
| |
| impl fmt::Display for LoopIdError { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| f.write_str(match self { |
| LoopIdError::OutsideLoopScope => "not inside loop scope", |
| LoopIdError::UnlabeledCfInWhileCondition => { |
| "unlabeled control flow (break or continue) in while condition" |
| } |
| LoopIdError::UnresolvedLabel => "label not found", |
| }) |
| } |
| } |
| |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Destination { |
| // This is `Some(_)` iff there is an explicit user-specified `label |
| pub label: Option<Label>, |
| |
| // These errors are caught and then reported during the diagnostics pass in |
| // librustc_passes/loops.rs |
| pub target_id: Result<HirId, LoopIdError>, |
| } |
| |
| /// The yield kind that caused an `ExprKind::Yield`. |
| #[derive(Copy, Clone, PartialEq, Eq, Debug, RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub enum YieldSource { |
| /// An `<expr>.await`. |
| Await, |
| /// A plain `yield`. |
| Yield, |
| } |
| |
| impl fmt::Display for YieldSource { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| f.write_str(match self { |
| YieldSource::Await => "`await`", |
| YieldSource::Yield => "`yield`", |
| }) |
| } |
| } |
| |
| impl From<GeneratorKind> for YieldSource { |
| fn from(kind: GeneratorKind) -> Self { |
| match kind { |
| // Guess based on the kind of the current generator. |
| GeneratorKind::Gen => Self::Yield, |
| GeneratorKind::Async(_) => Self::Await, |
| } |
| } |
| } |
| |
| // N.B., if you change this, you'll probably want to change the corresponding |
| // type structure in middle/ty.rs as well. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct MutTy<'hir> { |
| pub ty: &'hir Ty<'hir>, |
| pub mutbl: Mutability, |
| } |
| |
| /// Represents a function's signature in a trait declaration, |
| /// trait implementation, or a free function. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct FnSig<'hir> { |
| pub header: FnHeader, |
| pub decl: &'hir FnDecl<'hir>, |
| } |
| |
| // The bodies for items are stored "out of line", in a separate |
| // hashmap in the `Crate`. Here we just record the node-id of the item |
| // so it can fetched later. |
| #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, RustcEncodable, RustcDecodable, Debug)] |
| pub struct TraitItemId { |
| pub hir_id: HirId, |
| } |
| |
| /// Represents an item declaration within a trait declaration, |
| /// possibly including a default implementation. A trait item is |
| /// either required (meaning it doesn't have an implementation, just a |
| /// signature) or provided (meaning it has a default implementation). |
| #[derive(RustcEncodable, RustcDecodable, Debug)] |
| pub struct TraitItem<'hir> { |
| pub ident: Ident, |
| pub hir_id: HirId, |
| pub attrs: &'hir [Attribute], |
| pub generics: Generics<'hir>, |
| pub kind: TraitItemKind<'hir>, |
| pub span: Span, |
| } |
| |
| /// Represents a trait method's body (or just argument names). |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum TraitMethod<'hir> { |
| /// No default body in the trait, just a signature. |
| Required(&'hir [Ident]), |
| |
| /// Both signature and body are provided in the trait. |
| Provided(BodyId), |
| } |
| |
| /// Represents a trait method or associated constant or type |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum TraitItemKind<'hir> { |
| /// An associated constant with an optional value (otherwise `impl`s must contain a value). |
| Const(&'hir Ty<'hir>, Option<BodyId>), |
| /// A method with an optional body. |
| Method(FnSig<'hir>, TraitMethod<'hir>), |
| /// An associated type with (possibly empty) bounds and optional concrete |
| /// type. |
| Type(GenericBounds<'hir>, Option<&'hir Ty<'hir>>), |
| } |
| |
| // The bodies for items are stored "out of line", in a separate |
| // hashmap in the `Crate`. Here we just record the node-id of the item |
| // so it can fetched later. |
| #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, RustcEncodable, RustcDecodable, Debug)] |
| pub struct ImplItemId { |
| pub hir_id: HirId, |
| } |
| |
| /// Represents anything within an `impl` block. |
| #[derive(RustcEncodable, RustcDecodable, Debug)] |
| pub struct ImplItem<'hir> { |
| pub ident: Ident, |
| pub hir_id: HirId, |
| pub vis: Visibility<'hir>, |
| pub defaultness: Defaultness, |
| pub attrs: &'hir [Attribute], |
| pub generics: Generics<'hir>, |
| pub kind: ImplItemKind<'hir>, |
| pub span: Span, |
| } |
| |
| /// Represents various kinds of content within an `impl`. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum ImplItemKind<'hir> { |
| /// An associated constant of the given type, set to the constant result |
| /// of the expression. |
| Const(&'hir Ty<'hir>, BodyId), |
| /// A method implementation with the given signature and body. |
| Method(FnSig<'hir>, BodyId), |
| /// An associated type. |
| TyAlias(&'hir Ty<'hir>), |
| /// An associated `type = impl Trait`. |
| OpaqueTy(GenericBounds<'hir>), |
| } |
| |
| // The name of the associated type for `Fn` return types. |
| pub const FN_OUTPUT_NAME: Symbol = sym::Output; |
| |
| /// Bind a type to an associated type (i.e., `A = Foo`). |
| /// |
| /// Bindings like `A: Debug` are represented as a special type `A = |
| /// $::Debug` that is understood by the astconv code. |
| /// |
| /// FIXME(alexreg): why have a separate type for the binding case, |
| /// wouldn't it be better to make the `ty` field an enum like the |
| /// following? |
| /// |
| /// ``` |
| /// enum TypeBindingKind { |
| /// Equals(...), |
| /// Binding(...), |
| /// } |
| /// ``` |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct TypeBinding<'hir> { |
| pub hir_id: HirId, |
| #[stable_hasher(project(name))] |
| pub ident: Ident, |
| pub kind: TypeBindingKind<'hir>, |
| pub span: Span, |
| } |
| |
| // Represents the two kinds of type bindings. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum TypeBindingKind<'hir> { |
| /// E.g., `Foo<Bar: Send>`. |
| Constraint { bounds: &'hir [GenericBound<'hir>] }, |
| /// E.g., `Foo<Bar = ()>`. |
| Equality { ty: &'hir Ty<'hir> }, |
| } |
| |
| impl TypeBinding<'_> { |
| pub fn ty(&self) -> &Ty<'_> { |
| match self.kind { |
| TypeBindingKind::Equality { ref ty } => ty, |
| _ => panic!("expected equality type binding for parenthesized generic args"), |
| } |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable)] |
| pub struct Ty<'hir> { |
| pub hir_id: HirId, |
| pub kind: TyKind<'hir>, |
| pub span: Span, |
| } |
| |
| impl fmt::Debug for Ty<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "type({})", print::to_string(print::NO_ANN, |s| s.print_type(self))) |
| } |
| } |
| |
| /// Not represented directly in the AST; referred to by name through a `ty_path`. |
| #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)] |
| #[derive(HashStable_Generic)] |
| pub enum PrimTy { |
| Int(IntTy), |
| Uint(UintTy), |
| Float(FloatTy), |
| Str, |
| Bool, |
| Char, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct BareFnTy<'hir> { |
| pub unsafety: Unsafety, |
| pub abi: Abi, |
| pub generic_params: &'hir [GenericParam<'hir>], |
| pub decl: &'hir FnDecl<'hir>, |
| pub param_names: &'hir [Ident], |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct OpaqueTy<'hir> { |
| pub generics: Generics<'hir>, |
| pub bounds: GenericBounds<'hir>, |
| pub impl_trait_fn: Option<DefId>, |
| pub origin: OpaqueTyOrigin, |
| } |
| |
| /// From whence the opaque type came. |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum OpaqueTyOrigin { |
| /// `type Foo = impl Trait;` |
| TypeAlias, |
| /// `-> impl Trait` |
| FnReturn, |
| /// `async fn` |
| AsyncFn, |
| } |
| |
| /// The various kinds of types recognized by the compiler. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum TyKind<'hir> { |
| /// A variable length slice (i.e., `[T]`). |
| Slice(&'hir Ty<'hir>), |
| /// A fixed length array (i.e., `[T; n]`). |
| Array(&'hir Ty<'hir>, AnonConst), |
| /// A raw pointer (i.e., `*const T` or `*mut T`). |
| Ptr(MutTy<'hir>), |
| /// A reference (i.e., `&'a T` or `&'a mut T`). |
| Rptr(Lifetime, MutTy<'hir>), |
| /// A bare function (e.g., `fn(usize) -> bool`). |
| BareFn(&'hir BareFnTy<'hir>), |
| /// The never type (`!`). |
| Never, |
| /// A tuple (`(A, B, C, D, ...)`). |
| Tup(&'hir [Ty<'hir>]), |
| /// A path to a type definition (`module::module::...::Type`), or an |
| /// associated type (e.g., `<Vec<T> as Trait>::Type` or `<T>::Target`). |
| /// |
| /// Type parameters may be stored in each `PathSegment`. |
| Path(QPath<'hir>), |
| /// A type definition itself. This is currently only used for the `type Foo = impl Trait` |
| /// item that `impl Trait` in return position desugars to. |
| /// |
| /// The generic argument list contains the lifetimes (and in the future possibly parameters) |
| /// that are actually bound on the `impl Trait`. |
| Def(ItemId, &'hir [GenericArg<'hir>]), |
| /// A trait object type `Bound1 + Bound2 + Bound3` |
| /// where `Bound` is a trait or a lifetime. |
| TraitObject(&'hir [PolyTraitRef<'hir>], Lifetime), |
| /// Unused for now. |
| Typeof(AnonConst), |
| /// `TyKind::Infer` means the type should be inferred instead of it having been |
| /// specified. This can appear anywhere in a type. |
| Infer, |
| /// Placeholder for a type that has failed to be defined. |
| Err, |
| } |
| |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic, PartialEq)] |
| pub struct InlineAsmOutput { |
| pub constraint: Symbol, |
| pub is_rw: bool, |
| pub is_indirect: bool, |
| pub span: Span, |
| } |
| |
| // NOTE(eddyb) This is used within MIR as well, so unlike the rest of the HIR, |
| // it needs to be `Clone` and use plain `Vec<T>` instead of arena-allocated slice. |
| #[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic, PartialEq)] |
| pub struct InlineAsmInner { |
| pub asm: Symbol, |
| pub asm_str_style: StrStyle, |
| pub outputs: Vec<InlineAsmOutput>, |
| pub inputs: Vec<Symbol>, |
| pub clobbers: Vec<Symbol>, |
| pub volatile: bool, |
| pub alignstack: bool, |
| pub dialect: AsmDialect, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct InlineAsm<'hir> { |
| pub inner: InlineAsmInner, |
| pub outputs_exprs: &'hir [Expr<'hir>], |
| pub inputs_exprs: &'hir [Expr<'hir>], |
| } |
| |
| /// Represents a parameter in a function header. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Param<'hir> { |
| pub attrs: &'hir [Attribute], |
| pub hir_id: HirId, |
| pub pat: &'hir Pat<'hir>, |
| pub span: Span, |
| } |
| |
| /// Represents the header (not the body) of a function declaration. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct FnDecl<'hir> { |
| /// The types of the function's parameters. |
| /// |
| /// Additional argument data is stored in the function's [body](Body::parameters). |
| pub inputs: &'hir [Ty<'hir>], |
| pub output: FunctionRetTy<'hir>, |
| pub c_variadic: bool, |
| /// Does the function have an implicit self? |
| pub implicit_self: ImplicitSelfKind, |
| } |
| |
| /// Represents what type of implicit self a function has, if any. |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum ImplicitSelfKind { |
| /// Represents a `fn x(self);`. |
| Imm, |
| /// Represents a `fn x(mut self);`. |
| Mut, |
| /// Represents a `fn x(&self);`. |
| ImmRef, |
| /// Represents a `fn x(&mut self);`. |
| MutRef, |
| /// Represents when a function does not have a self argument or |
| /// when a function has a `self: X` argument. |
| None, |
| } |
| |
| impl ImplicitSelfKind { |
| /// Does this represent an implicit self? |
| pub fn has_implicit_self(&self) -> bool { |
| match *self { |
| ImplicitSelfKind::None => false, |
| _ => true, |
| } |
| } |
| } |
| |
| #[derive( |
| Copy, |
| Clone, |
| PartialEq, |
| Eq, |
| PartialOrd, |
| HashStable_Generic, |
| Ord, |
| RustcEncodable, |
| RustcDecodable, |
| Debug |
| )] |
| pub enum IsAsync { |
| Async, |
| NotAsync, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum Defaultness { |
| Default { has_value: bool }, |
| Final, |
| } |
| |
| impl Defaultness { |
| pub fn has_value(&self) -> bool { |
| match *self { |
| Defaultness::Default { has_value, .. } => has_value, |
| Defaultness::Final => true, |
| } |
| } |
| |
| pub fn is_final(&self) -> bool { |
| *self == Defaultness::Final |
| } |
| |
| pub fn is_default(&self) -> bool { |
| match *self { |
| Defaultness::Default { .. } => true, |
| _ => false, |
| } |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum FunctionRetTy<'hir> { |
| /// Return type is not specified. |
| /// |
| /// Functions default to `()` and |
| /// closures default to inference. Span points to where return |
| /// type would be inserted. |
| DefaultReturn(Span), |
| /// Everything else. |
| Return(&'hir Ty<'hir>), |
| } |
| |
| impl fmt::Display for FunctionRetTy<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| match self { |
| Self::Return(ref ty) => print::to_string(print::NO_ANN, |s| s.print_type(ty)).fmt(f), |
| Self::DefaultReturn(_) => "()".fmt(f), |
| } |
| } |
| } |
| |
| impl FunctionRetTy<'_> { |
| pub fn span(&self) -> Span { |
| match *self { |
| Self::DefaultReturn(span) => span, |
| Self::Return(ref ty) => ty.span, |
| } |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug)] |
| pub struct Mod<'hir> { |
| /// A span from the first token past `{` to the last token until `}`. |
| /// For `mod foo;`, the inner span ranges from the first token |
| /// to the last token in the external file. |
| pub inner: Span, |
| pub item_ids: &'hir [ItemId], |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct ForeignMod<'hir> { |
| pub abi: Abi, |
| pub items: &'hir [ForeignItem<'hir>], |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct GlobalAsm { |
| pub asm: Symbol, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct EnumDef<'hir> { |
| pub variants: &'hir [Variant<'hir>], |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct Variant<'hir> { |
| /// Name of the variant. |
| #[stable_hasher(project(name))] |
| pub ident: Ident, |
| /// Attributes of the variant. |
| pub attrs: &'hir [Attribute], |
| /// Id of the variant (not the constructor, see `VariantData::ctor_hir_id()`). |
| pub id: HirId, |
| /// Fields and constructor id of the variant. |
| pub data: VariantData<'hir>, |
| /// Explicit discriminant (e.g., `Foo = 1`). |
| pub disr_expr: Option<AnonConst>, |
| /// Span |
| pub span: Span, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum UseKind { |
| /// One import, e.g., `use foo::bar` or `use foo::bar as baz`. |
| /// Also produced for each element of a list `use`, e.g. |
| /// `use foo::{a, b}` lowers to `use foo::a; use foo::b;`. |
| Single, |
| |
| /// Glob import, e.g., `use foo::*`. |
| Glob, |
| |
| /// Degenerate list import, e.g., `use foo::{a, b}` produces |
| /// an additional `use foo::{}` for performing checks such as |
| /// unstable feature gating. May be removed in the future. |
| ListStem, |
| } |
| |
| /// References to traits in impls. |
| /// |
| /// `resolve` maps each `TraitRef`'s `ref_id` to its defining trait; that's all |
| /// that the `ref_id` is for. Note that `ref_id`'s value is not the `HirId` of the |
| /// trait being referred to but just a unique `HirId` that serves as a key |
| /// within the resolution map. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct TraitRef<'hir> { |
| pub path: &'hir Path<'hir>, |
| // Don't hash the `ref_id`. It is tracked via the thing it is used to access. |
| #[stable_hasher(ignore)] |
| pub hir_ref_id: HirId, |
| } |
| |
| impl TraitRef<'_> { |
| /// Gets the `DefId` of the referenced trait. It _must_ actually be a trait or trait alias. |
| pub fn trait_def_id(&self) -> DefId { |
| match self.path.res { |
| Res::Def(DefKind::Trait, did) => did, |
| Res::Def(DefKind::TraitAlias, did) => did, |
| Res::Err => { |
| FatalError.raise(); |
| } |
| _ => unreachable!(), |
| } |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct PolyTraitRef<'hir> { |
| /// The `'a` in `<'a> Foo<&'a T>`. |
| pub bound_generic_params: &'hir [GenericParam<'hir>], |
| |
| /// The `Foo<&'a T>` in `<'a> Foo<&'a T>`. |
| pub trait_ref: TraitRef<'hir>, |
| |
| pub span: Span, |
| } |
| |
| pub type Visibility<'hir> = Spanned<VisibilityKind<'hir>>; |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug)] |
| pub enum VisibilityKind<'hir> { |
| Public, |
| Crate(CrateSugar), |
| Restricted { path: &'hir Path<'hir>, hir_id: HirId }, |
| Inherited, |
| } |
| |
| impl VisibilityKind<'_> { |
| pub fn is_pub(&self) -> bool { |
| match *self { |
| VisibilityKind::Public => true, |
| _ => false, |
| } |
| } |
| |
| pub fn is_pub_restricted(&self) -> bool { |
| match *self { |
| VisibilityKind::Public | VisibilityKind::Inherited => false, |
| VisibilityKind::Crate(..) | VisibilityKind::Restricted { .. } => true, |
| } |
| } |
| |
| pub fn descr(&self) -> &'static str { |
| match *self { |
| VisibilityKind::Public => "public", |
| VisibilityKind::Inherited => "private", |
| VisibilityKind::Crate(..) => "crate-visible", |
| VisibilityKind::Restricted { .. } => "restricted", |
| } |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct StructField<'hir> { |
| pub span: Span, |
| #[stable_hasher(project(name))] |
| pub ident: Ident, |
| pub vis: Visibility<'hir>, |
| pub hir_id: HirId, |
| pub ty: &'hir Ty<'hir>, |
| pub attrs: &'hir [Attribute], |
| } |
| |
| impl StructField<'_> { |
| // Still necessary in couple of places |
| pub fn is_positional(&self) -> bool { |
| let first = self.ident.as_str().as_bytes()[0]; |
| first >= b'0' && first <= b'9' |
| } |
| } |
| |
| /// Fields and constructor IDs of enum variants and structs. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum VariantData<'hir> { |
| /// A struct variant. |
| /// |
| /// E.g., `Bar { .. }` as in `enum Foo { Bar { .. } }`. |
| Struct(&'hir [StructField<'hir>], /* recovered */ bool), |
| /// A tuple variant. |
| /// |
| /// E.g., `Bar(..)` as in `enum Foo { Bar(..) }`. |
| Tuple(&'hir [StructField<'hir>], HirId), |
| /// A unit variant. |
| /// |
| /// E.g., `Bar = ..` as in `enum Foo { Bar = .. }`. |
| Unit(HirId), |
| } |
| |
| impl VariantData<'hir> { |
| /// Return the fields of this variant. |
| pub fn fields(&self) -> &'hir [StructField<'hir>] { |
| match *self { |
| VariantData::Struct(ref fields, ..) | VariantData::Tuple(ref fields, ..) => fields, |
| _ => &[], |
| } |
| } |
| |
| /// Return the `HirId` of this variant's constructor, if it has one. |
| pub fn ctor_hir_id(&self) -> Option<HirId> { |
| match *self { |
| VariantData::Struct(_, _) => None, |
| VariantData::Tuple(_, hir_id) | VariantData::Unit(hir_id) => Some(hir_id), |
| } |
| } |
| } |
| |
| // The bodies for items are stored "out of line", in a separate |
| // hashmap in the `Crate`. Here we just record the node-id of the item |
| // so it can fetched later. |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug)] |
| pub struct ItemId { |
| pub id: HirId, |
| } |
| |
| /// An item |
| /// |
| /// The name might be a dummy name in case of anonymous items |
| #[derive(RustcEncodable, RustcDecodable, Debug)] |
| pub struct Item<'hir> { |
| pub ident: Ident, |
| pub hir_id: HirId, |
| pub attrs: &'hir [Attribute], |
| pub kind: ItemKind<'hir>, |
| pub vis: Visibility<'hir>, |
| pub span: Span, |
| } |
| |
| #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct FnHeader { |
| pub unsafety: Unsafety, |
| pub constness: Constness, |
| pub asyncness: IsAsync, |
| pub abi: Abi, |
| } |
| |
| impl FnHeader { |
| pub fn is_const(&self) -> bool { |
| match &self.constness { |
| Constness::Const => true, |
| _ => false, |
| } |
| } |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum ItemKind<'hir> { |
| /// An `extern crate` item, with optional *original* crate name if the crate was renamed. |
| /// |
| /// E.g., `extern crate foo` or `extern crate foo_bar as foo`. |
| ExternCrate(Option<Name>), |
| |
| /// `use foo::bar::*;` or `use foo::bar::baz as quux;` |
| /// |
| /// or just |
| /// |
| /// `use foo::bar::baz;` (with `as baz` implicitly on the right). |
| Use(&'hir Path<'hir>, UseKind), |
| |
| /// A `static` item. |
| Static(&'hir Ty<'hir>, Mutability, BodyId), |
| /// A `const` item. |
| Const(&'hir Ty<'hir>, BodyId), |
| /// A function declaration. |
| Fn(FnSig<'hir>, Generics<'hir>, BodyId), |
| /// A module. |
| Mod(Mod<'hir>), |
| /// An external module, e.g. `extern { .. }`. |
| ForeignMod(ForeignMod<'hir>), |
| /// Module-level inline assembly (from `global_asm!`). |
| GlobalAsm(&'hir GlobalAsm), |
| /// A type alias, e.g., `type Foo = Bar<u8>`. |
| TyAlias(&'hir Ty<'hir>, Generics<'hir>), |
| /// An opaque `impl Trait` type alias, e.g., `type Foo = impl Bar;`. |
| OpaqueTy(OpaqueTy<'hir>), |
| /// An enum definition, e.g., `enum Foo<A, B> {C<A>, D<B>}`. |
| Enum(EnumDef<'hir>, Generics<'hir>), |
| /// A struct definition, e.g., `struct Foo<A> {x: A}`. |
| Struct(VariantData<'hir>, Generics<'hir>), |
| /// A union definition, e.g., `union Foo<A, B> {x: A, y: B}`. |
| Union(VariantData<'hir>, Generics<'hir>), |
| /// A trait definition. |
| Trait(IsAuto, Unsafety, Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]), |
| /// A trait alias. |
| TraitAlias(Generics<'hir>, GenericBounds<'hir>), |
| |
| /// An implementation, e.g., `impl<A> Trait for Foo { .. }`. |
| Impl( |
| Unsafety, |
| ImplPolarity, |
| Defaultness, |
| Generics<'hir>, |
| Option<TraitRef<'hir>>, // (optional) trait this impl implements |
| &'hir Ty<'hir>, // self |
| &'hir [ImplItemRef<'hir>], |
| ), |
| } |
| |
| impl ItemKind<'_> { |
| pub fn descriptive_variant(&self) -> &str { |
| match *self { |
| ItemKind::ExternCrate(..) => "extern crate", |
| ItemKind::Use(..) => "use", |
| ItemKind::Static(..) => "static item", |
| ItemKind::Const(..) => "constant item", |
| ItemKind::Fn(..) => "function", |
| ItemKind::Mod(..) => "module", |
| ItemKind::ForeignMod(..) => "foreign module", |
| ItemKind::GlobalAsm(..) => "global asm", |
| ItemKind::TyAlias(..) => "type alias", |
| ItemKind::OpaqueTy(..) => "opaque type", |
| ItemKind::Enum(..) => "enum", |
| ItemKind::Struct(..) => "struct", |
| ItemKind::Union(..) => "union", |
| ItemKind::Trait(..) => "trait", |
| ItemKind::TraitAlias(..) => "trait alias", |
| ItemKind::Impl(..) => "impl", |
| } |
| } |
| |
| pub fn generics(&self) -> Option<&Generics<'_>> { |
| Some(match *self { |
| ItemKind::Fn(_, ref generics, _) |
| | ItemKind::TyAlias(_, ref generics) |
| | ItemKind::OpaqueTy(OpaqueTy { ref generics, impl_trait_fn: None, .. }) |
| | ItemKind::Enum(_, ref generics) |
| | ItemKind::Struct(_, ref generics) |
| | ItemKind::Union(_, ref generics) |
| | ItemKind::Trait(_, _, ref generics, _, _) |
| | ItemKind::Impl(_, _, _, ref generics, _, _, _) => generics, |
| _ => return None, |
| }) |
| } |
| } |
| |
| /// A reference from an trait to one of its associated items. This |
| /// contains the item's id, naturally, but also the item's name and |
| /// some other high-level details (like whether it is an associated |
| /// type or method, and whether it is public). This allows other |
| /// passes to find the impl they want without loading the ID (which |
| /// means fewer edges in the incremental compilation graph). |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct TraitItemRef { |
| pub id: TraitItemId, |
| #[stable_hasher(project(name))] |
| pub ident: Ident, |
| pub kind: AssocItemKind, |
| pub span: Span, |
| pub defaultness: Defaultness, |
| } |
| |
| /// A reference from an impl to one of its associated items. This |
| /// contains the item's ID, naturally, but also the item's name and |
| /// some other high-level details (like whether it is an associated |
| /// type or method, and whether it is public). This allows other |
| /// passes to find the impl they want without loading the ID (which |
| /// means fewer edges in the incremental compilation graph). |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct ImplItemRef<'hir> { |
| pub id: ImplItemId, |
| #[stable_hasher(project(name))] |
| pub ident: Ident, |
| pub kind: AssocItemKind, |
| pub span: Span, |
| pub vis: Visibility<'hir>, |
| pub defaultness: Defaultness, |
| } |
| |
| #[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum AssocItemKind { |
| Const, |
| Method { has_self: bool }, |
| Type, |
| OpaqueTy, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub struct ForeignItem<'hir> { |
| #[stable_hasher(project(name))] |
| pub ident: Ident, |
| pub attrs: &'hir [Attribute], |
| pub kind: ForeignItemKind<'hir>, |
| pub hir_id: HirId, |
| pub span: Span, |
| pub vis: Visibility<'hir>, |
| } |
| |
| /// An item within an `extern` block. |
| #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)] |
| pub enum ForeignItemKind<'hir> { |
| /// A foreign function. |
| Fn(&'hir FnDecl<'hir>, &'hir [Ident], Generics<'hir>), |
| /// A foreign static item (`static ext: u8`). |
| Static(&'hir Ty<'hir>, Mutability), |
| /// A foreign type. |
| Type, |
| } |
| |
| impl ForeignItemKind<'hir> { |
| pub fn descriptive_variant(&self) -> &str { |
| match *self { |
| ForeignItemKind::Fn(..) => "foreign function", |
| ForeignItemKind::Static(..) => "foreign static item", |
| ForeignItemKind::Type => "foreign type", |
| } |
| } |
| } |
| |
| /// A variable captured by a closure. |
| #[derive(Debug, Copy, Clone, RustcEncodable, RustcDecodable, HashStable_Generic)] |
| pub struct Upvar { |
| // First span where it is accessed (there can be multiple). |
| pub span: Span, |
| } |
| |
| pub type CaptureModeMap = NodeMap<CaptureBy>; |
| |
| // The TraitCandidate's import_ids is empty if the trait is defined in the same module, and |
| // has length > 0 if the trait is found through an chain of imports, starting with the |
| // import/use statement in the scope where the trait is used. |
| #[derive(Clone, Debug)] |
| pub struct TraitCandidate { |
| pub def_id: DefId, |
| pub import_ids: SmallVec<[NodeId; 1]>, |
| } |
| |
| // Trait method resolution |
| pub type TraitMap = NodeMap<Vec<TraitCandidate>>; |
| |
| // Map from the NodeId of a glob import to a list of items which are actually |
| // imported. |
| pub type GlobMap = NodeMap<FxHashSet<Name>>; |
| |
| #[derive(Copy, Clone, Debug)] |
| pub enum Node<'hir> { |
| Param(&'hir Param<'hir>), |
| Item(&'hir Item<'hir>), |
| ForeignItem(&'hir ForeignItem<'hir>), |
| TraitItem(&'hir TraitItem<'hir>), |
| ImplItem(&'hir ImplItem<'hir>), |
| Variant(&'hir Variant<'hir>), |
| Field(&'hir StructField<'hir>), |
| AnonConst(&'hir AnonConst), |
| Expr(&'hir Expr<'hir>), |
| Stmt(&'hir Stmt<'hir>), |
| PathSegment(&'hir PathSegment<'hir>), |
| Ty(&'hir Ty<'hir>), |
| TraitRef(&'hir TraitRef<'hir>), |
| Binding(&'hir Pat<'hir>), |
| Pat(&'hir Pat<'hir>), |
| Arm(&'hir Arm<'hir>), |
| Block(&'hir Block<'hir>), |
| Local(&'hir Local<'hir>), |
| MacroDef(&'hir MacroDef<'hir>), |
| |
| /// `Ctor` refers to the constructor of an enum variant or struct. Only tuple or unit variants |
| /// with synthesized constructors. |
| Ctor(&'hir VariantData<'hir>), |
| |
| Lifetime(&'hir Lifetime), |
| GenericParam(&'hir GenericParam<'hir>), |
| Visibility(&'hir Visibility<'hir>), |
| |
| Crate, |
| } |
| |
| impl Node<'_> { |
| pub fn ident(&self) -> Option<Ident> { |
| match self { |
| Node::TraitItem(TraitItem { ident, .. }) |
| | Node::ImplItem(ImplItem { ident, .. }) |
| | Node::ForeignItem(ForeignItem { ident, .. }) |
| | Node::Item(Item { ident, .. }) => Some(*ident), |
| _ => None, |
| } |
| } |
| } |