language-servers/rust-analyzer
1
0
Fork 0
mirror of https://github.com/rust-lang/rust-analyzer.git synced 2025-11-19 03:28:36 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 4

refactor: Lower type-refs before type inference

Browse source 
This refactors how we deal with items in hir-def lowering.

- It now lowers all of them through an "ExpressionStore" (kind of a misnomer as this point) as their so called *Signatures.
- We now uniformly lower type AST into TypeRefs before type inference.
- Likewise, this moves macro expansion out of type inference, resulting in a single place where we do non-defmap macro expansion.
- Finally, this PR removes a lot of information from ItemTree, making the DefMap a lot less likely to be recomputed and have it only depend on actual early name resolution related information (not 100% true, we still have ADT fields in there but thats a follow up removal).
This commit is contained in:
Lukas Wirth 2025-01-25 17:20:10 +01:00
parent 588948f267
commit 1fd9520c92
127 changed files with 6733 additions and 7993 deletions
Download patch file Download diff file Expand all files Collapse all files

519
crates/hir-def/src/item_tree/lower.rs
View file

@ -4,41 +4,28 @@ use std::{cell::OnceCell, collections::hash_map::Entry};
use hir_expand::{
HirFileId,
mod_path::path,
mod_path::PathKind,
name::AsName,
span_map::{SpanMap, SpanMapRef},
};
use intern::{Symbol, sym};
use la_arena::Arena;
use rustc_hash::FxHashMap;
use span::{AstIdMap, SyntaxContext};
use syntax::{
AstNode,
ast::{self, HasModuleItem, HasName, HasTypeBounds, IsString},
ast::{self, HasModuleItem, HasName, IsString},
};
use thin_vec::ThinVec;
use triomphe::Arc;
use crate::{
LocalLifetimeParamId, LocalTypeOrConstParamId,
db::DefDatabase,
generics::{GenericParams, GenericParamsCollector},
item_tree::{
AssocItem, AttrOwner, Const, Either, Enum, ExternBlock, ExternCrate, Field, FieldParent,
FieldsShape, FileItemTreeId, FnFlags, Function, GenericArgs, GenericItemSourceMapBuilder,
GenericModItem, Idx, Impl, ImportAlias, Interned, ItemTree, ItemTreeData,
ItemTreeSourceMaps, ItemTreeSourceMapsBuilder, Macro2, MacroCall, MacroRules, Mod, ModItem,
ModKind, ModPath, Mutability, Name, Param, Path, Range, RawAttrs, RawIdx, RawVisibilityId,
Static, StaticFlags, Struct, StructKind, Trait, TraitAlias, TypeAlias, Union, Use, UseTree,
UseTreeKind, Variant,
AssocItem, AttrOwner, Const, Enum, ExternBlock, ExternCrate, Field, FieldParent,
FieldsShape, FileItemTreeId, Function, Idx, Impl, ImportAlias, Interned, ItemTree,
ItemTreeData, Macro2, MacroCall, MacroRules, Mod, ModItem, ModKind, ModPath, Name, Range,
RawAttrs, RawIdx, RawVisibility, RawVisibilityId, Static, Struct, StructKind, Trait,
TraitAlias, TypeAlias, Union, Use, UseTree, UseTreeKind, Variant, VisibilityExplicitness,
},
lower::LowerCtx,
path::AssociatedTypeBinding,
type_ref::{
LifetimeRef, PathId, RefType, TraitBoundModifier, TraitRef, TypeBound, TypeRef, TypeRefId,
TypesMap, TypesSourceMap,
},
visibility::RawVisibility,
};
fn id<N>(index: Idx<N>) -> FileItemTreeId<N> {
@ -49,11 +36,8 @@ pub(super) struct Ctx<'a> {
db: &'a dyn DefDatabase,
tree: ItemTree,
source_ast_id_map: Arc<AstIdMap>,
generic_param_attr_buffer:
FxHashMap<Either<LocalTypeOrConstParamId, LocalLifetimeParamId>, RawAttrs>,
span_map: OnceCell<SpanMap>,
file: HirFileId,
source_maps: ItemTreeSourceMapsBuilder,
}
impl<'a> Ctx<'a> {
@ -61,11 +45,9 @@ impl<'a> Ctx<'a> {
Self {
db,
tree: ItemTree::default(),
generic_param_attr_buffer: FxHashMap::default(),
source_ast_id_map: db.ast_id_map(file),
file,
span_map: OnceCell::new(),
source_maps: ItemTreeSourceMapsBuilder::default(),
}
}
@ -73,39 +55,13 @@ impl<'a> Ctx<'a> {
self.span_map.get_or_init(|| self.db.span_map(self.file)).as_ref()
}
fn body_ctx<'b, 'c>(
&self,
types_map: &'b mut TypesMap,
types_source_map: &'b mut TypesSourceMap,
) -> LowerCtx<'c>
where
'a: 'c,
'b: 'c,
{
// FIXME: This seems a bit wasteful that if `LowerCtx` will initialize the span map we won't benefit.
LowerCtx::with_span_map_cell(
self.db,
self.file,
self.span_map.clone(),
types_map,
types_source_map,
)
}
pub(super) fn lower_module_items(
mut self,
item_owner: &dyn HasModuleItem,
) -> (ItemTree, ItemTreeSourceMaps) {
pub(super) fn lower_module_items(mut self, item_owner: &dyn HasModuleItem) -> ItemTree {
self.tree.top_level =
item_owner.items().flat_map(|item| self.lower_mod_item(&item)).collect();
assert!(self.generic_param_attr_buffer.is_empty());
(self.tree, self.source_maps.build())
self.tree
}
pub(super) fn lower_macro_stmts(
mut self,
stmts: ast::MacroStmts,
) -> (ItemTree, ItemTreeSourceMaps) {
pub(super) fn lower_macro_stmts(mut self, stmts: ast::MacroStmts) -> ItemTree {
self.tree.top_level = stmts
.statements()
.filter_map(|stmt| {
@ -135,11 +91,10 @@ impl<'a> Ctx<'a> {
}
}
assert!(self.generic_param_attr_buffer.is_empty());
(self.tree, self.source_maps.build())
self.tree
}
pub(super) fn lower_block(mut self, block: &ast::BlockExpr) -> (ItemTree, ItemTreeSourceMaps) {
pub(super) fn lower_block(mut self, block: &ast::BlockExpr) -> ItemTree {
self.tree
.attrs
.insert(AttrOwner::TopLevel, RawAttrs::new(self.db.upcast(), block, self.span_map()));
@ -164,8 +119,7 @@ impl<'a> Ctx<'a> {
}
}
assert!(self.generic_param_attr_buffer.is_empty());
(self.tree, self.source_maps.build())
self.tree
}
fn data(&mut self) -> &mut ItemTreeData {
@ -232,31 +186,13 @@ impl<'a> Ctx<'a> {
}
fn lower_struct(&mut self, strukt: &ast::Struct) -> Option<FileItemTreeId<Struct>> {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
let visibility = self.lower_visibility(strukt);
let name = strukt.name()?.as_name();
let ast_id = self.source_ast_id_map.ast_id(strukt);
let (fields, kind, attrs) = self.lower_fields(&strukt.kind(), &mut body_ctx);
let (generic_params, generics_source_map) =
self.lower_generic_params(HasImplicitSelf::No, strukt);
types_map.shrink_to_fit();
types_source_map.shrink_to_fit();
let res = Struct {
name,
visibility,
generic_params,
fields,
shape: kind,
ast_id,
types_map: Arc::new(types_map),
};
let (fields, kind, attrs) = self.lower_fields(&strukt.kind());
let res = Struct { name, visibility, fields, shape: kind, ast_id };
let id = id(self.data().structs.alloc(res));
self.source_maps.structs.push(GenericItemSourceMapBuilder {
item: types_source_map,
generics: generics_source_map,
});
for (idx, attr) in attrs {
self.add_attrs(
AttrOwner::Field(
@ -266,14 +202,12 @@ impl<'a> Ctx<'a> {
attr,
);
}
self.write_generic_params_attributes(id.into());
Some(id)
}
fn lower_fields(
&mut self,
strukt_kind: &ast::StructKind,
body_ctx: &mut LowerCtx<'_>,
) -> (Box<[Field]>, FieldsShape, Vec<(usize, RawAttrs)>) {
match strukt_kind {
ast::StructKind::Record(it) => {
@ -281,7 +215,7 @@ impl<'a> Ctx<'a> {
let mut attrs = vec![];
for (i, field) in it.fields().enumerate() {
let data = self.lower_record_field(&field, body_ctx);
let data = self.lower_record_field(&field);
fields.push(data);
let attr = RawAttrs::new(self.db.upcast(), &field, self.span_map());
if !attr.is_empty() {
@ -295,7 +229,7 @@ impl<'a> Ctx<'a> {
let mut attrs = vec![];
for (i, field) in it.fields().enumerate() {
let data = self.lower_tuple_field(i, &field, body_ctx);
let data = self.lower_tuple_field(i, &field);
fields.push(data);
let attr = RawAttrs::new(self.db.upcast(), &field, self.span_map());
if !attr.is_empty() {
@ -308,63 +242,32 @@ impl<'a> Ctx<'a> {
}
}
fn lower_record_field(
&mut self,
field: &ast::RecordField,
body_ctx: &mut LowerCtx<'_>,
) -> Field {
fn lower_record_field(&mut self, field: &ast::RecordField) -> Field {
let name = match field.name() {
Some(name) => name.as_name(),
None => Name::missing(),
};
let visibility = self.lower_visibility(field);
let type_ref = TypeRef::from_ast_opt(body_ctx, field.ty());
Field { name, type_ref, visibility, is_unsafe: field.unsafe_token().is_some() }
Field { name, visibility, is_unsafe: field.unsafe_token().is_some() }
}
fn lower_tuple_field(
&mut self,
idx: usize,
field: &ast::TupleField,
body_ctx: &mut LowerCtx<'_>,
) -> Field {
fn lower_tuple_field(&mut self, idx: usize, field: &ast::TupleField) -> Field {
let name = Name::new_tuple_field(idx);
let visibility = self.lower_visibility(field);
let type_ref = TypeRef::from_ast_opt(body_ctx, field.ty());
Field { name, type_ref, visibility, is_unsafe: false }
Field { name, visibility, is_unsafe: false }
}
fn lower_union(&mut self, union: &ast::Union) -> Option<FileItemTreeId<Union>> {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
let visibility = self.lower_visibility(union);
let name = union.name()?.as_name();
let ast_id = self.source_ast_id_map.ast_id(union);
let (fields, _, attrs) = match union.record_field_list() {
Some(record_field_list) => {
self.lower_fields(&StructKind::Record(record_field_list), &mut body_ctx)
}
Some(record_field_list) => self.lower_fields(&StructKind::Record(record_field_list)),
None => (Box::default(), FieldsShape::Record, Vec::default()),
};
let (generic_params, generics_source_map) =
self.lower_generic_params(HasImplicitSelf::No, union);
types_map.shrink_to_fit();
types_source_map.shrink_to_fit();
let res = Union {
name,
visibility,
generic_params,
fields,
ast_id,
types_map: Arc::new(types_map),
};
let res = Union { name, visibility, fields, ast_id };
let id = id(self.data().unions.alloc(res));
self.source_maps.unions.push(GenericItemSourceMapBuilder {
item: types_source_map,
generics: generics_source_map,
});
for (idx, attr) in attrs {
self.add_attrs(
AttrOwner::Field(
@ -374,7 +277,6 @@ impl<'a> Ctx<'a> {
attr,
);
}
self.write_generic_params_attributes(id.into());
Some(id)
}
@ -388,12 +290,8 @@ impl<'a> Ctx<'a> {
FileItemTreeId(self.next_variant_idx())..FileItemTreeId(self.next_variant_idx())
}
};
let (generic_params, generics_source_map) =
self.lower_generic_params(HasImplicitSelf::No, enum_);
let res = Enum { name, visibility, generic_params, variants, ast_id };
let res = Enum { name, visibility, variants, ast_id };
let id = id(self.data().enums.alloc(res));
self.source_maps.enum_generics.push(generics_source_map);
self.write_generic_params_attributes(id.into());
Some(id)
}
@ -411,20 +309,14 @@ impl<'a> Ctx<'a> {
}
fn lower_variant(&mut self, variant: &ast::Variant) -> Idx<Variant> {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
let name = match variant.name() {
Some(name) => name.as_name(),
None => Name::missing(),
};
let (fields, kind, attrs) = self.lower_fields(&variant.kind(), &mut body_ctx);
let (fields, kind, attrs) = self.lower_fields(&variant.kind());
let ast_id = self.source_ast_id_map.ast_id(variant);
types_map.shrink_to_fit();
types_source_map.shrink_to_fit();
let res = Variant { name, fields, shape: kind, ast_id, types_map: Arc::new(types_map) };
let res = Variant { name, fields, shape: kind, ast_id };
let id = self.data().variants.alloc(res);
self.source_maps.variants.push(types_source_map);
for (idx, attr) in attrs {
self.add_attrs(
AttrOwner::Field(
@ -438,144 +330,14 @@ impl<'a> Ctx<'a> {
}
fn lower_function(&mut self, func: &ast::Fn) -> Option<FileItemTreeId<Function>> {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
let visibility = self.lower_visibility(func);
let name = func.name()?.as_name();
let mut has_self_param = false;
let mut has_var_args = false;
let mut params = vec![];
let mut attrs = vec![];
let mut push_attr = |idx, attr: RawAttrs| {
if !attr.is_empty() {
attrs.push((idx, attr))
}
};
if let Some(param_list) = func.param_list() {
if let Some(self_param) = param_list.self_param() {
push_attr(
params.len(),
RawAttrs::new(self.db.upcast(), &self_param, self.span_map()),
);
let self_type = match self_param.ty() {
Some(type_ref) => TypeRef::from_ast(&mut body_ctx, type_ref),
None => {
let self_type = body_ctx.alloc_type_ref_desugared(TypeRef::Path(
Name::new_symbol_root(sym::Self_.clone()).into(),
));
match self_param.kind() {
ast::SelfParamKind::Owned => self_type,
ast::SelfParamKind::Ref => body_ctx.alloc_type_ref_desugared(
TypeRef::Reference(Box::new(RefType {
ty: self_type,
lifetime: self_param.lifetime().as_ref().map(LifetimeRef::new),
mutability: Mutability::Shared,
})),
),
ast::SelfParamKind::MutRef => body_ctx.alloc_type_ref_desugared(
TypeRef::Reference(Box::new(RefType {
ty: self_type,
lifetime: self_param.lifetime().as_ref().map(LifetimeRef::new),
mutability: Mutability::Mut,
})),
),
}
}
};
params.push(Param { type_ref: Some(self_type) });
has_self_param = true;
}
for param in param_list.params() {
push_attr(params.len(), RawAttrs::new(self.db.upcast(), &param, self.span_map()));
let param = match param.dotdotdot_token() {
Some(_) => {
has_var_args = true;
Param { type_ref: None }
}
None => {
let type_ref = TypeRef::from_ast_opt(&mut body_ctx, param.ty());
Param { type_ref: Some(type_ref) }
}
};
params.push(param);
}
}
let ret_type = match func.ret_type() {
Some(rt) => match rt.ty() {
Some(type_ref) => TypeRef::from_ast(&mut body_ctx, type_ref),
None if rt.thin_arrow_token().is_some() => body_ctx.alloc_error_type(),
None => body_ctx.alloc_type_ref_desugared(TypeRef::unit()),
},
None => body_ctx.alloc_type_ref_desugared(TypeRef::unit()),
};
let ret_type = if func.async_token().is_some() {
let future_impl = desugar_future_path(&mut body_ctx, ret_type);
let ty_bound = TypeBound::Path(future_impl, TraitBoundModifier::None);
body_ctx.alloc_type_ref_desugared(TypeRef::ImplTrait(ThinVec::from_iter([ty_bound])))
} else {
ret_type
};
let abi = func.abi().map(lower_abi);
let ast_id = self.source_ast_id_map.ast_id(func);
let mut flags = FnFlags::default();
if func.body().is_some() {
flags |= FnFlags::HAS_BODY;
}
if has_self_param {
flags |= FnFlags::HAS_SELF_PARAM;
}
if func.default_token().is_some() {
flags |= FnFlags::HAS_DEFAULT_KW;
}
if func.const_token().is_some() {
flags |= FnFlags::HAS_CONST_KW;
}
if func.async_token().is_some() {
flags |= FnFlags::HAS_ASYNC_KW;
}
if func.unsafe_token().is_some() {
flags |= FnFlags::HAS_UNSAFE_KW;
}
if func.safe_token().is_some() {
flags |= FnFlags::HAS_SAFE_KW;
}
if has_var_args {
flags |= FnFlags::IS_VARARGS;
}
types_map.shrink_to_fit();
types_source_map.shrink_to_fit();
let (generic_params, generics_source_map) =
self.lower_generic_params(HasImplicitSelf::No, func);
let res = Function {
name,
visibility,
explicit_generic_params: generic_params,
abi,
params: params.into_boxed_slice(),
ret_type,
ast_id,
types_map: Arc::new(types_map),
flags,
};
let res = Function { name, visibility, ast_id };
let id = id(self.data().functions.alloc(res));
self.source_maps.functions.push(GenericItemSourceMapBuilder {
item: types_source_map,
generics: generics_source_map,
});
for (idx, attr) in attrs {
self.add_attrs(AttrOwner::Param(id, Idx::from_raw(RawIdx::from_u32(idx as u32))), attr);
}
self.write_generic_params_attributes(id.into());
Some(id)
}
@ -583,83 +345,27 @@ impl<'a> Ctx<'a> {
&mut self,
type_alias: &ast::TypeAlias,
) -> Option<FileItemTreeId<TypeAlias>> {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
let name = type_alias.name()?.as_name();
let type_ref = type_alias.ty().map(|it| TypeRef::from_ast(&mut body_ctx, it));
let visibility = self.lower_visibility(type_alias);
let bounds = self.lower_type_bounds(type_alias, &mut body_ctx);
let ast_id = self.source_ast_id_map.ast_id(type_alias);
let (generic_params, generics_source_map) =
self.lower_generic_params(HasImplicitSelf::No, type_alias);
types_map.shrink_to_fit();
types_source_map.shrink_to_fit();
let res = TypeAlias {
name,
visibility,
bounds,
generic_params,
type_ref,
ast_id,
types_map: Arc::new(types_map),
};
let res = TypeAlias { name, visibility, ast_id };
let id = id(self.data().type_aliases.alloc(res));
self.source_maps.type_aliases.push(GenericItemSourceMapBuilder {
item: types_source_map,
generics: generics_source_map,
});
self.write_generic_params_attributes(id.into());
Some(id)
}
fn lower_static(&mut self, static_: &ast::Static) -> Option<FileItemTreeId<Static>> {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
let name = static_.name()?.as_name();
let type_ref = TypeRef::from_ast_opt(&mut body_ctx, static_.ty());
let visibility = self.lower_visibility(static_);
let mut flags = StaticFlags::empty();
if static_.mut_token().is_some() {
flags |= StaticFlags::MUTABLE;
}
if static_.safe_token().is_some() {
flags |= StaticFlags::HAS_SAFE_KW;
}
if static_.unsafe_token().is_some() {
flags |= StaticFlags::HAS_UNSAFE_KW;
}
let ast_id = self.source_ast_id_map.ast_id(static_);
types_map.shrink_to_fit();
types_source_map.shrink_to_fit();
let res =
Static { name, visibility, type_ref, ast_id, flags, types_map: Arc::new(types_map) };
self.source_maps.statics.push(types_source_map);
let res = Static { name, visibility, ast_id };
Some(id(self.data().statics.alloc(res)))
}
fn lower_const(&mut self, konst: &ast::Const) -> FileItemTreeId<Const> {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
let name = konst.name().map(|it| it.as_name());
let type_ref = TypeRef::from_ast_opt(&mut body_ctx, konst.ty());
let visibility = self.lower_visibility(konst);
let ast_id = self.source_ast_id_map.ast_id(konst);
types_map.shrink_to_fit();
types_source_map.shrink_to_fit();
let res = Const {
name,
visibility,
type_ref,
ast_id,
has_body: konst.body().is_some(),
types_map: Arc::new(types_map),
};
self.source_maps.consts.push(types_source_map);
let res = Const { name, visibility, ast_id };
id(self.data().consts.alloc(res))
}
@ -688,8 +394,6 @@ impl<'a> Ctx<'a> {
let name = trait_def.name()?.as_name();
let visibility = self.lower_visibility(trait_def);
let ast_id = self.source_ast_id_map.ast_id(trait_def);
let is_auto = trait_def.auto_token().is_some();
let is_unsafe = trait_def.unsafe_token().is_some();
let items = trait_def
.assoc_item_list()
@ -698,12 +402,8 @@ impl<'a> Ctx<'a> {
.filter_map(|item_node| self.lower_assoc_item(&item_node))
.collect();
let (generic_params, generics_source_map) =
self.lower_generic_params(HasImplicitSelf::Yes(trait_def.type_bound_list()), trait_def);
let def = Trait { name, visibility, generic_params, is_auto, is_unsafe, items, ast_id };
let def = Trait { name, visibility, items, ast_id };
let id = id(self.data().traits.alloc(def));
self.source_maps.trait_generics.push(generics_source_map);
self.write_generic_params_attributes(id.into());
Some(id)
}
@ -714,32 +414,14 @@ impl<'a> Ctx<'a> {
let name = trait_alias_def.name()?.as_name();
let visibility = self.lower_visibility(trait_alias_def);
let ast_id = self.source_ast_id_map.ast_id(trait_alias_def);
let (generic_params, generics_source_map) = self.lower_generic_params(
HasImplicitSelf::Yes(trait_alias_def.type_bound_list()),
trait_alias_def,
);
let alias = TraitAlias { name, visibility, generic_params, ast_id };
let alias = TraitAlias { name, visibility, ast_id };
let id = id(self.data().trait_aliases.alloc(alias));
self.source_maps.trait_alias_generics.push(generics_source_map);
self.write_generic_params_attributes(id.into());
Some(id)
}
fn lower_impl(&mut self, impl_def: &ast::Impl) -> FileItemTreeId<Impl> {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
let ast_id = self.source_ast_id_map.ast_id(impl_def);
// FIXME: If trait lowering fails, due to a non PathType for example, we treat this impl
// as if it was an non-trait impl. Ideally we want to create a unique missing ref that only
// equals itself.
let self_ty = TypeRef::from_ast_opt(&mut body_ctx, impl_def.self_ty());
let target_trait = impl_def.trait_().and_then(|tr| TraitRef::from_ast(&mut body_ctx, tr));
let is_negative = impl_def.excl_token().is_some();
let is_unsafe = impl_def.unsafe_token().is_some();
// We cannot use `assoc_items()` here as that does not include macro calls.
let items = impl_def
.assoc_item_list()
@ -749,27 +431,8 @@ impl<'a> Ctx<'a> {
.collect();
// Note that trait impls don't get implicit `Self` unlike traits, because here they are a
// type alias rather than a type parameter, so this is handled by the resolver.
let (generic_params, generics_source_map) =
self.lower_generic_params(HasImplicitSelf::No, impl_def);
types_map.shrink_to_fit();
types_source_map.shrink_to_fit();
let res = Impl {
generic_params,
target_trait,
self_ty,
is_negative,
is_unsafe,
items,
ast_id,
types_map: Arc::new(types_map),
};
let id = id(self.data().impls.alloc(res));
self.source_maps.impls.push(GenericItemSourceMapBuilder {
item: types_source_map,
generics: generics_source_map,
});
self.write_generic_params_attributes(id.into());
id
let res = Impl { items, ast_id };
id(self.data().impls.alloc(res))
}
fn lower_use(&mut self, use_item: &ast::Use) -> Option<FileItemTreeId<Use>> {
@ -856,68 +519,8 @@ impl<'a> Ctx<'a> {
id(self.data().extern_blocks.alloc(res))
}
fn write_generic_params_attributes(&mut self, parent: GenericModItem) {
self.generic_param_attr_buffer.drain().for_each(|(idx, attrs)| {
self.tree.attrs.insert(
match idx {
Either::Left(id) => AttrOwner::TypeOrConstParamData(parent, id),
Either::Right(id) => AttrOwner::LifetimeParamData(parent, id),
},
attrs,
);
})
}
fn lower_generic_params(
&mut self,
has_implicit_self: HasImplicitSelf,
node: &dyn ast::HasGenericParams,
) -> (Arc<GenericParams>, TypesSourceMap) {
let (mut types_map, mut types_source_map) =
(TypesMap::default(), TypesSourceMap::default());
let mut body_ctx = self.body_ctx(&mut types_map, &mut types_source_map);
debug_assert!(self.generic_param_attr_buffer.is_empty(),);
body_ctx.take_impl_traits_bounds();
let mut generics = GenericParamsCollector::default();
if let HasImplicitSelf::Yes(bounds) = has_implicit_self {
// Traits and trait aliases get the Self type as an implicit first type parameter.
generics.fill_self_param();
// add super traits as bounds on Self
// i.e., `trait Foo: Bar` is equivalent to `trait Foo where Self: Bar`
let bound_target = Either::Left(body_ctx.alloc_type_ref_desugared(TypeRef::Path(
Name::new_symbol_root(sym::Self_.clone()).into(),
)));
generics.fill_bounds(&mut body_ctx, bounds, bound_target);
}
let span_map = body_ctx.span_map().clone();
let add_param_attrs = |item: Either<LocalTypeOrConstParamId, LocalLifetimeParamId>,
param| {
let attrs = RawAttrs::new(self.db.upcast(), &param, span_map.as_ref());
debug_assert!(self.generic_param_attr_buffer.insert(item, attrs).is_none());
};
generics.fill(&mut body_ctx, node, add_param_attrs);
let generics = generics.finish(types_map, &mut types_source_map);
(generics, types_source_map)
}
fn lower_type_bounds(
&mut self,
node: &dyn ast::HasTypeBounds,
body_ctx: &mut LowerCtx<'_>,
) -> Box<[TypeBound]> {
match node.type_bound_list() {
Some(bound_list) => {
bound_list.bounds().map(|it| TypeBound::from_ast(body_ctx, it)).collect()
}
None => Box::default(),
}
}
fn lower_visibility(&mut self, item: &dyn ast::HasVisibility) -> RawVisibilityId {
let vis = RawVisibility::from_ast(self.db, item.visibility(), &mut |range| {
let vis = visibility_from_ast(self.db, item.visibility(), &mut |range| {
self.span_map().span_for_range(range).ctx
});
self.data().vis.alloc(vis)
@ -930,27 +533,6 @@ impl<'a> Ctx<'a> {
}
}
fn desugar_future_path(ctx: &mut LowerCtx<'_>, orig: TypeRefId) -> PathId {
let path = path![core::future::Future];
let mut generic_args: Vec<_> = std::iter::repeat_n(None, path.segments().len() - 1).collect();
let binding = AssociatedTypeBinding {
name: Name::new_symbol_root(sym::Output.clone()),
args: None,
type_ref: Some(orig),
bounds: Box::default(),
};
generic_args.push(Some(GenericArgs { bindings: Box::new([binding]), ..GenericArgs::empty() }));
let path = Path::from_known_path(path, generic_args);
PathId::from_type_ref_unchecked(ctx.alloc_type_ref_desugared(TypeRef::Path(path)))
}
enum HasImplicitSelf {
/// Inner list is a type bound list for the implicit `Self`.
Yes(Option<ast::TypeBoundList>),
No,
}
fn lower_abi(abi: ast::Abi) -> Symbol {
match abi.abi_string() {
Some(tok) => Symbol::intern(tok.text_without_quotes()),
@ -1041,3 +623,32 @@ pub(crate) fn lower_use_tree(
let tree = lowering.lower_use_tree(tree, span_for_range)?;
Some((tree, lowering.mapping))
}
fn private_vis() -> RawVisibility {
RawVisibility::Module(
Interned::new(ModPath::from_kind(PathKind::SELF)),
VisibilityExplicitness::Implicit,
)
}
fn visibility_from_ast(
db: &dyn DefDatabase,
node: Option<ast::Visibility>,
span_for_range: &mut dyn FnMut(::tt::TextRange) -> SyntaxContext,
) -> RawVisibility {
let Some(node) = node else { return private_vis() };
let path = match node.kind() {
ast::VisibilityKind::In(path) => {
let path = ModPath::from_src(db.upcast(), path, span_for_range);
match path {
None => return private_vis(),
Some(path) => path,
}
}
ast::VisibilityKind::PubCrate => ModPath::from_kind(PathKind::Crate),
ast::VisibilityKind::PubSuper => ModPath::from_kind(PathKind::Super(1)),
ast::VisibilityKind::PubSelf => ModPath::from_kind(PathKind::SELF),
ast::VisibilityKind::Pub => return RawVisibility::Public,
};
RawVisibility::Module(Interned::new(path), VisibilityExplicitness::Explicit)
}