mirror of
https://github.com/rust-lang/rust-analyzer
synced 2024-12-29 06:23:25 +00:00
955e609867
This doesn't get rid of the once_cell dependency, unfortunately, since we have dependencies that use it, but it's a nice to do cleanup. And when our deps will eventually get rid of once_cell we will get rid of it for free.
663 lines
24 KiB
Rust
663 lines
24 KiB
Rust
//! Many kinds of items or constructs can have generic parameters: functions,
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//! structs, impls, traits, etc. This module provides a common HIR for these
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//! generic parameters. See also the `Generics` type and the `generics_of` query
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//! in rustc.
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use std::ops;
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use either::Either;
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use hir_expand::{
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name::{AsName, Name},
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ExpandResult,
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};
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use intern::Interned;
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use la_arena::{Arena, RawIdx};
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use stdx::impl_from;
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use syntax::ast::{self, HasGenericParams, HasName, HasTypeBounds};
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use triomphe::Arc;
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use crate::{
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db::DefDatabase,
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expander::Expander,
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item_tree::{AttrOwner, FileItemTreeId, GenericModItem, GenericsItemTreeNode, ItemTree},
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lower::LowerCtx,
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nameres::{DefMap, MacroSubNs},
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type_ref::{ConstRef, LifetimeRef, TypeBound, TypeRef},
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AdtId, ConstParamId, GenericDefId, HasModule, ItemTreeLoc, LifetimeParamId,
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LocalLifetimeParamId, LocalTypeOrConstParamId, Lookup, TypeOrConstParamId, TypeParamId,
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};
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/// The index of the self param in the generic of the non-parent definition.
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const SELF_PARAM_ID_IN_SELF: la_arena::Idx<TypeOrConstParamData> =
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LocalTypeOrConstParamId::from_raw(RawIdx::from_u32(0));
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/// Data about a generic type parameter (to a function, struct, impl, ...).
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#[derive(Clone, PartialEq, Eq, Debug, Hash)]
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pub struct TypeParamData {
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/// [`None`] only if the type ref is an [`TypeRef::ImplTrait`]. FIXME: Might be better to just
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/// make it always be a value, giving impl trait a special name.
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pub name: Option<Name>,
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pub default: Option<Interned<TypeRef>>,
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pub provenance: TypeParamProvenance,
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}
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/// Data about a generic lifetime parameter (to a function, struct, impl, ...).
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#[derive(Clone, PartialEq, Eq, Debug, Hash)]
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pub struct LifetimeParamData {
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pub name: Name,
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}
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/// Data about a generic const parameter (to a function, struct, impl, ...).
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#[derive(Clone, PartialEq, Eq, Debug, Hash)]
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pub struct ConstParamData {
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pub name: Name,
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pub ty: Interned<TypeRef>,
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pub default: Option<ConstRef>,
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}
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#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
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pub enum TypeParamProvenance {
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TypeParamList,
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TraitSelf,
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ArgumentImplTrait,
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}
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#[derive(Clone, PartialEq, Eq, Debug, Hash)]
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pub enum TypeOrConstParamData {
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TypeParamData(TypeParamData),
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ConstParamData(ConstParamData),
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}
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impl TypeOrConstParamData {
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pub fn name(&self) -> Option<&Name> {
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match self {
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TypeOrConstParamData::TypeParamData(it) => it.name.as_ref(),
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TypeOrConstParamData::ConstParamData(it) => Some(&it.name),
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}
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}
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pub fn has_default(&self) -> bool {
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match self {
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TypeOrConstParamData::TypeParamData(it) => it.default.is_some(),
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TypeOrConstParamData::ConstParamData(it) => it.default.is_some(),
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}
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}
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pub fn type_param(&self) -> Option<&TypeParamData> {
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match self {
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TypeOrConstParamData::TypeParamData(it) => Some(it),
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TypeOrConstParamData::ConstParamData(_) => None,
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}
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}
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pub fn const_param(&self) -> Option<&ConstParamData> {
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match self {
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TypeOrConstParamData::TypeParamData(_) => None,
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TypeOrConstParamData::ConstParamData(it) => Some(it),
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}
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}
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pub fn is_trait_self(&self) -> bool {
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match self {
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TypeOrConstParamData::TypeParamData(it) => {
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it.provenance == TypeParamProvenance::TraitSelf
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}
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TypeOrConstParamData::ConstParamData(_) => false,
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}
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}
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}
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impl_from!(TypeParamData, ConstParamData for TypeOrConstParamData);
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#[derive(Clone, PartialEq, Eq, Debug, Hash)]
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pub enum GenericParamData {
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TypeParamData(TypeParamData),
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ConstParamData(ConstParamData),
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LifetimeParamData(LifetimeParamData),
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}
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impl GenericParamData {
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pub fn name(&self) -> Option<&Name> {
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match self {
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GenericParamData::TypeParamData(it) => it.name.as_ref(),
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GenericParamData::ConstParamData(it) => Some(&it.name),
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GenericParamData::LifetimeParamData(it) => Some(&it.name),
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}
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}
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pub fn type_param(&self) -> Option<&TypeParamData> {
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match self {
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GenericParamData::TypeParamData(it) => Some(it),
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_ => None,
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}
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}
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pub fn const_param(&self) -> Option<&ConstParamData> {
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match self {
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GenericParamData::ConstParamData(it) => Some(it),
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_ => None,
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}
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}
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pub fn lifetime_param(&self) -> Option<&LifetimeParamData> {
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match self {
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GenericParamData::LifetimeParamData(it) => Some(it),
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_ => None,
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}
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}
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}
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impl_from!(TypeParamData, ConstParamData, LifetimeParamData for GenericParamData);
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pub enum GenericParamDataRef<'a> {
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TypeParamData(&'a TypeParamData),
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ConstParamData(&'a ConstParamData),
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LifetimeParamData(&'a LifetimeParamData),
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}
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/// Data about the generic parameters of a function, struct, impl, etc.
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#[derive(Clone, PartialEq, Eq, Debug, Hash)]
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pub struct GenericParams {
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type_or_consts: Arena<TypeOrConstParamData>,
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lifetimes: Arena<LifetimeParamData>,
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where_predicates: Box<[WherePredicate]>,
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}
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impl ops::Index<LocalTypeOrConstParamId> for GenericParams {
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type Output = TypeOrConstParamData;
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fn index(&self, index: LocalTypeOrConstParamId) -> &TypeOrConstParamData {
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&self.type_or_consts[index]
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}
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}
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impl ops::Index<LocalLifetimeParamId> for GenericParams {
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type Output = LifetimeParamData;
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fn index(&self, index: LocalLifetimeParamId) -> &LifetimeParamData {
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&self.lifetimes[index]
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}
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}
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/// A single predicate from a where clause, i.e. `where Type: Trait`. Combined
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/// where clauses like `where T: Foo + Bar` are turned into multiple of these.
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/// It might still result in multiple actual predicates though, because of
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/// associated type bindings like `Iterator<Item = u32>`.
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#[derive(Clone, PartialEq, Eq, Debug, Hash)]
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pub enum WherePredicate {
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TypeBound {
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target: WherePredicateTypeTarget,
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bound: Interned<TypeBound>,
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},
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Lifetime {
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target: LifetimeRef,
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bound: LifetimeRef,
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},
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ForLifetime {
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lifetimes: Box<[Name]>,
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target: WherePredicateTypeTarget,
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bound: Interned<TypeBound>,
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},
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}
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#[derive(Clone, PartialEq, Eq, Debug, Hash)]
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pub enum WherePredicateTypeTarget {
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TypeRef(Interned<TypeRef>),
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/// For desugared where predicates that can directly refer to a type param.
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TypeOrConstParam(LocalTypeOrConstParamId),
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}
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impl GenericParams {
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/// Number of Generic parameters (type_or_consts + lifetimes)
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#[inline]
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pub fn len(&self) -> usize {
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self.type_or_consts.len() + self.lifetimes.len()
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}
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#[inline]
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pub fn len_lifetimes(&self) -> usize {
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self.lifetimes.len()
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}
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#[inline]
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pub fn len_type_or_consts(&self) -> usize {
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self.type_or_consts.len()
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}
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#[inline]
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pub fn is_empty(&self) -> bool {
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self.len() == 0
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}
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#[inline]
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pub fn where_predicates(&self) -> std::slice::Iter<'_, WherePredicate> {
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self.where_predicates.iter()
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}
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/// Iterator of type_or_consts field
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#[inline]
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pub fn iter_type_or_consts(
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&self,
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) -> impl DoubleEndedIterator<Item = (LocalTypeOrConstParamId, &TypeOrConstParamData)> {
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self.type_or_consts.iter()
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}
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/// Iterator of lifetimes field
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#[inline]
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pub fn iter_lt(
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&self,
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) -> impl DoubleEndedIterator<Item = (LocalLifetimeParamId, &LifetimeParamData)> {
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self.lifetimes.iter()
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}
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pub fn find_type_by_name(&self, name: &Name, parent: GenericDefId) -> Option<TypeParamId> {
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self.type_or_consts.iter().find_map(|(id, p)| {
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if p.name().as_ref() == Some(&name) && p.type_param().is_some() {
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Some(TypeParamId::from_unchecked(TypeOrConstParamId { local_id: id, parent }))
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} else {
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None
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}
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})
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}
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pub fn find_const_by_name(&self, name: &Name, parent: GenericDefId) -> Option<ConstParamId> {
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self.type_or_consts.iter().find_map(|(id, p)| {
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if p.name().as_ref() == Some(&name) && p.const_param().is_some() {
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Some(ConstParamId::from_unchecked(TypeOrConstParamId { local_id: id, parent }))
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} else {
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None
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}
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})
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}
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#[inline]
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pub fn trait_self_param(&self) -> Option<LocalTypeOrConstParamId> {
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if self.type_or_consts.is_empty() {
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return None;
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}
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matches!(
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self.type_or_consts[SELF_PARAM_ID_IN_SELF],
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TypeOrConstParamData::TypeParamData(TypeParamData {
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provenance: TypeParamProvenance::TraitSelf,
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..
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})
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)
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.then(|| SELF_PARAM_ID_IN_SELF)
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}
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pub fn find_lifetime_by_name(
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&self,
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name: &Name,
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parent: GenericDefId,
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) -> Option<LifetimeParamId> {
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self.lifetimes.iter().find_map(|(id, p)| {
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if &p.name == name {
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Some(LifetimeParamId { local_id: id, parent })
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} else {
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None
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}
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})
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}
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pub(crate) fn generic_params_query(
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db: &dyn DefDatabase,
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def: GenericDefId,
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) -> Interned<GenericParams> {
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let _p = tracing::info_span!("generic_params_query").entered();
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let krate = def.krate(db);
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let cfg_options = db.crate_graph();
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let cfg_options = &cfg_options[krate].cfg_options;
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// Returns the generic parameters that are enabled under the current `#[cfg]` options
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let enabled_params =
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|params: &Interned<GenericParams>, item_tree: &ItemTree, parent: GenericModItem| {
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let enabled = |param| item_tree.attrs(db, krate, param).is_cfg_enabled(cfg_options);
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let attr_owner_ct = |param| AttrOwner::TypeOrConstParamData(parent, param);
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let attr_owner_lt = |param| AttrOwner::LifetimeParamData(parent, param);
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// In the common case, no parameters will by disabled by `#[cfg]` attributes.
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// Therefore, make a first pass to check if all parameters are enabled and, if so,
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// clone the `Interned<GenericParams>` instead of recreating an identical copy.
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let all_type_or_consts_enabled =
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params.type_or_consts.iter().all(|(idx, _)| enabled(attr_owner_ct(idx)));
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let all_lifetimes_enabled =
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params.lifetimes.iter().all(|(idx, _)| enabled(attr_owner_lt(idx)));
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if all_type_or_consts_enabled && all_lifetimes_enabled {
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params.clone()
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} else {
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Interned::new(GenericParams {
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type_or_consts: all_type_or_consts_enabled
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.then(|| params.type_or_consts.clone())
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.unwrap_or_else(|| {
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params
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.type_or_consts
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.iter()
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.filter(|&(idx, _)| enabled(attr_owner_ct(idx)))
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.map(|(_, param)| param.clone())
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.collect()
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}),
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lifetimes: all_lifetimes_enabled
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.then(|| params.lifetimes.clone())
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.unwrap_or_else(|| {
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params
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.lifetimes
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.iter()
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.filter(|&(idx, _)| enabled(attr_owner_lt(idx)))
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.map(|(_, param)| param.clone())
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.collect()
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}),
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where_predicates: params.where_predicates.clone(),
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})
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}
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};
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fn id_to_generics<Id: GenericsItemTreeNode>(
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db: &dyn DefDatabase,
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id: impl for<'db> Lookup<
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Database<'db> = dyn DefDatabase + 'db,
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Data = impl ItemTreeLoc<Id = Id>,
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>,
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enabled_params: impl Fn(
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&Interned<GenericParams>,
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&ItemTree,
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GenericModItem,
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) -> Interned<GenericParams>,
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) -> Interned<GenericParams>
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where
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FileItemTreeId<Id>: Into<GenericModItem>,
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{
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let id = id.lookup(db).item_tree_id();
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let tree = id.item_tree(db);
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let item = &tree[id.value];
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enabled_params(item.generic_params(), &tree, id.value.into())
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}
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match def {
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GenericDefId::FunctionId(id) => {
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let loc = id.lookup(db);
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let tree = loc.id.item_tree(db);
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let item = &tree[loc.id.value];
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let enabled_params =
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enabled_params(&item.explicit_generic_params, &tree, loc.id.value.into());
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let module = loc.container.module(db);
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let func_data = db.function_data(id);
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if func_data.params.is_empty() {
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enabled_params
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} else {
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let mut generic_params = GenericParamsCollector {
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type_or_consts: enabled_params.type_or_consts.clone(),
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lifetimes: enabled_params.lifetimes.clone(),
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where_predicates: enabled_params.where_predicates.clone().into(),
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};
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// Don't create an `Expander` if not needed since this
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// could cause a reparse after the `ItemTree` has been created due to the spanmap.
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let mut expander = None;
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for param in func_data.params.iter() {
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generic_params.fill_implicit_impl_trait_args(
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db,
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&mut expander,
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&mut || {
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(module.def_map(db), Expander::new(db, loc.id.file_id(), module))
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},
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param,
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);
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}
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Interned::new(generic_params.finish())
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}
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}
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GenericDefId::AdtId(AdtId::StructId(id)) => id_to_generics(db, id, enabled_params),
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GenericDefId::AdtId(AdtId::EnumId(id)) => id_to_generics(db, id, enabled_params),
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GenericDefId::AdtId(AdtId::UnionId(id)) => id_to_generics(db, id, enabled_params),
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GenericDefId::TraitId(id) => id_to_generics(db, id, enabled_params),
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GenericDefId::TraitAliasId(id) => id_to_generics(db, id, enabled_params),
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GenericDefId::TypeAliasId(id) => id_to_generics(db, id, enabled_params),
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GenericDefId::ImplId(id) => id_to_generics(db, id, enabled_params),
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GenericDefId::ConstId(_) => Interned::new(GenericParams {
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type_or_consts: Default::default(),
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lifetimes: Default::default(),
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where_predicates: Default::default(),
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}),
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}
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}
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}
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#[derive(Clone, Default)]
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pub(crate) struct GenericParamsCollector {
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pub(crate) type_or_consts: Arena<TypeOrConstParamData>,
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lifetimes: Arena<LifetimeParamData>,
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where_predicates: Vec<WherePredicate>,
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}
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impl GenericParamsCollector {
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pub(crate) fn fill(
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&mut self,
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lower_ctx: &LowerCtx<'_>,
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node: &dyn HasGenericParams,
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add_param_attrs: impl FnMut(
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Either<LocalTypeOrConstParamId, LocalLifetimeParamId>,
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ast::GenericParam,
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),
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) {
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if let Some(params) = node.generic_param_list() {
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self.fill_params(lower_ctx, params, add_param_attrs)
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}
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if let Some(where_clause) = node.where_clause() {
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self.fill_where_predicates(lower_ctx, where_clause);
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}
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}
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pub(crate) fn fill_bounds(
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&mut self,
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lower_ctx: &LowerCtx<'_>,
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type_bounds: Option<ast::TypeBoundList>,
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target: Either<TypeRef, LifetimeRef>,
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) {
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for bound in type_bounds.iter().flat_map(|type_bound_list| type_bound_list.bounds()) {
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self.add_where_predicate_from_bound(lower_ctx, bound, None, target.clone());
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}
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}
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fn fill_params(
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&mut self,
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lower_ctx: &LowerCtx<'_>,
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params: ast::GenericParamList,
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mut add_param_attrs: impl FnMut(
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Either<LocalTypeOrConstParamId, LocalLifetimeParamId>,
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ast::GenericParam,
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),
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) {
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for type_or_const_param in params.type_or_const_params() {
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match type_or_const_param {
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ast::TypeOrConstParam::Type(type_param) => {
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let name = type_param.name().map_or_else(Name::missing, |it| it.as_name());
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// FIXME: Use `Path::from_src`
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let default = type_param
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.default_type()
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.map(|it| Interned::new(TypeRef::from_ast(lower_ctx, it)));
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let param = TypeParamData {
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name: Some(name.clone()),
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default,
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provenance: TypeParamProvenance::TypeParamList,
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};
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let idx = self.type_or_consts.alloc(param.into());
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let type_ref = TypeRef::Path(name.into());
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self.fill_bounds(
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lower_ctx,
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type_param.type_bound_list(),
|
|
Either::Left(type_ref),
|
|
);
|
|
add_param_attrs(Either::Left(idx), ast::GenericParam::TypeParam(type_param));
|
|
}
|
|
ast::TypeOrConstParam::Const(const_param) => {
|
|
let name = const_param.name().map_or_else(Name::missing, |it| it.as_name());
|
|
let ty = const_param
|
|
.ty()
|
|
.map_or(TypeRef::Error, |it| TypeRef::from_ast(lower_ctx, it));
|
|
let param = ConstParamData {
|
|
name,
|
|
ty: Interned::new(ty),
|
|
default: ConstRef::from_const_param(lower_ctx, &const_param),
|
|
};
|
|
let idx = self.type_or_consts.alloc(param.into());
|
|
add_param_attrs(Either::Left(idx), ast::GenericParam::ConstParam(const_param));
|
|
}
|
|
}
|
|
}
|
|
for lifetime_param in params.lifetime_params() {
|
|
let name =
|
|
lifetime_param.lifetime().map_or_else(Name::missing, |lt| Name::new_lifetime(<));
|
|
let param = LifetimeParamData { name: name.clone() };
|
|
let idx = self.lifetimes.alloc(param);
|
|
let lifetime_ref = LifetimeRef::new_name(name);
|
|
self.fill_bounds(
|
|
lower_ctx,
|
|
lifetime_param.type_bound_list(),
|
|
Either::Right(lifetime_ref),
|
|
);
|
|
add_param_attrs(Either::Right(idx), ast::GenericParam::LifetimeParam(lifetime_param));
|
|
}
|
|
}
|
|
|
|
fn fill_where_predicates(&mut self, lower_ctx: &LowerCtx<'_>, where_clause: ast::WhereClause) {
|
|
for pred in where_clause.predicates() {
|
|
let target = if let Some(type_ref) = pred.ty() {
|
|
Either::Left(TypeRef::from_ast(lower_ctx, type_ref))
|
|
} else if let Some(lifetime) = pred.lifetime() {
|
|
Either::Right(LifetimeRef::new(&lifetime))
|
|
} else {
|
|
continue;
|
|
};
|
|
|
|
let lifetimes: Option<Box<_>> = pred.generic_param_list().map(|param_list| {
|
|
// Higher-Ranked Trait Bounds
|
|
param_list
|
|
.lifetime_params()
|
|
.map(|lifetime_param| {
|
|
lifetime_param
|
|
.lifetime()
|
|
.map_or_else(Name::missing, |lt| Name::new_lifetime(<))
|
|
})
|
|
.collect()
|
|
});
|
|
for bound in pred.type_bound_list().iter().flat_map(|l| l.bounds()) {
|
|
self.add_where_predicate_from_bound(
|
|
lower_ctx,
|
|
bound,
|
|
lifetimes.as_deref(),
|
|
target.clone(),
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn add_where_predicate_from_bound(
|
|
&mut self,
|
|
lower_ctx: &LowerCtx<'_>,
|
|
bound: ast::TypeBound,
|
|
hrtb_lifetimes: Option<&[Name]>,
|
|
target: Either<TypeRef, LifetimeRef>,
|
|
) {
|
|
let bound = TypeBound::from_ast(lower_ctx, bound);
|
|
self.fill_impl_trait_bounds(lower_ctx.take_impl_traits_bounds());
|
|
let predicate = match (target, bound) {
|
|
(Either::Left(type_ref), bound) => match hrtb_lifetimes {
|
|
Some(hrtb_lifetimes) => WherePredicate::ForLifetime {
|
|
lifetimes: hrtb_lifetimes.to_vec().into_boxed_slice(),
|
|
target: WherePredicateTypeTarget::TypeRef(Interned::new(type_ref)),
|
|
bound: Interned::new(bound),
|
|
},
|
|
None => WherePredicate::TypeBound {
|
|
target: WherePredicateTypeTarget::TypeRef(Interned::new(type_ref)),
|
|
bound: Interned::new(bound),
|
|
},
|
|
},
|
|
(Either::Right(lifetime), TypeBound::Lifetime(bound)) => {
|
|
WherePredicate::Lifetime { target: lifetime, bound }
|
|
}
|
|
_ => return,
|
|
};
|
|
self.where_predicates.push(predicate);
|
|
}
|
|
|
|
fn fill_impl_trait_bounds(&mut self, impl_bounds: Vec<Vec<Interned<TypeBound>>>) {
|
|
for bounds in impl_bounds {
|
|
let param = TypeParamData {
|
|
name: None,
|
|
default: None,
|
|
provenance: TypeParamProvenance::ArgumentImplTrait,
|
|
};
|
|
let param_id = self.type_or_consts.alloc(param.into());
|
|
for bound in bounds {
|
|
self.where_predicates.push(WherePredicate::TypeBound {
|
|
target: WherePredicateTypeTarget::TypeOrConstParam(param_id),
|
|
bound,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
fn fill_implicit_impl_trait_args(
|
|
&mut self,
|
|
db: &dyn DefDatabase,
|
|
// FIXME: Change this back to `LazyCell` if https://github.com/rust-lang/libs-team/issues/429 is accepted.
|
|
exp: &mut Option<(Arc<DefMap>, Expander)>,
|
|
exp_fill: &mut dyn FnMut() -> (Arc<DefMap>, Expander),
|
|
type_ref: &TypeRef,
|
|
) {
|
|
type_ref.walk(&mut |type_ref| {
|
|
if let TypeRef::ImplTrait(bounds) = type_ref {
|
|
let param = TypeParamData {
|
|
name: None,
|
|
default: None,
|
|
provenance: TypeParamProvenance::ArgumentImplTrait,
|
|
};
|
|
let param_id = self.type_or_consts.alloc(param.into());
|
|
for bound in bounds {
|
|
self.where_predicates.push(WherePredicate::TypeBound {
|
|
target: WherePredicateTypeTarget::TypeOrConstParam(param_id),
|
|
bound: bound.clone(),
|
|
});
|
|
}
|
|
}
|
|
if let TypeRef::Macro(mc) = type_ref {
|
|
let macro_call = mc.to_node(db.upcast());
|
|
let (def_map, expander) = exp.get_or_insert_with(&mut *exp_fill);
|
|
|
|
let module = expander.module.local_id;
|
|
let resolver = |path: &_| {
|
|
def_map
|
|
.resolve_path(
|
|
db,
|
|
module,
|
|
path,
|
|
crate::item_scope::BuiltinShadowMode::Other,
|
|
Some(MacroSubNs::Bang),
|
|
)
|
|
.0
|
|
.take_macros()
|
|
};
|
|
if let Ok(ExpandResult { value: Some((mark, expanded)), .. }) =
|
|
expander.enter_expand(db, macro_call, resolver)
|
|
{
|
|
let ctx = expander.ctx(db);
|
|
let type_ref = TypeRef::from_ast(&ctx, expanded.tree());
|
|
self.fill_implicit_impl_trait_args(db, &mut *exp, exp_fill, &type_ref);
|
|
exp.get_or_insert_with(&mut *exp_fill).1.exit(mark);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
pub(crate) fn finish(self) -> GenericParams {
|
|
let Self { mut lifetimes, mut type_or_consts, where_predicates } = self;
|
|
lifetimes.shrink_to_fit();
|
|
type_or_consts.shrink_to_fit();
|
|
GenericParams {
|
|
type_or_consts,
|
|
lifetimes,
|
|
where_predicates: where_predicates.into_boxed_slice(),
|
|
}
|
|
}
|
|
}
|