From 278556f9fe8240f0c76daaaf8dcf7ee7f516e4af Mon Sep 17 00:00:00 2001 From: Jonas Schievink Date: Tue, 16 Jun 2020 14:52:43 +0200 Subject: Move ItemTree lowering into its own module --- crates/ra_hir_def/src/item_tree/lower.rs | 501 +++++++++++++++++++++++++++++++ 1 file changed, 501 insertions(+) create mode 100644 crates/ra_hir_def/src/item_tree/lower.rs (limited to 'crates/ra_hir_def/src/item_tree') diff --git a/crates/ra_hir_def/src/item_tree/lower.rs b/crates/ra_hir_def/src/item_tree/lower.rs new file mode 100644 index 000000000..d123a7310 --- /dev/null +++ b/crates/ra_hir_def/src/item_tree/lower.rs @@ -0,0 +1,501 @@ +use super::*; +use crate::attr::Attrs; +use hir_expand::{ast_id_map::AstIdMap, hygiene::Hygiene, HirFileId}; +use ra_syntax::ast::{self, ModuleItemOwner}; +use smallvec::SmallVec; +use std::sync::Arc; + +struct ModItems(SmallVec<[ModItem; 1]>); + +impl From for ModItems +where + T: Into, +{ + fn from(t: T) -> Self { + ModItems(SmallVec::from_buf([t.into(); 1])) + } +} + +pub(super) struct Ctx { + pub tree: ItemTree, + pub hygiene: Hygiene, + pub file: HirFileId, + pub source_ast_id_map: Arc, + pub body_ctx: crate::body::LowerCtx, +} + +impl Ctx { + pub(super) fn lower(mut self, item_owner: &dyn ModuleItemOwner) -> ItemTree { + self.tree.top_level = item_owner + .items() + .flat_map(|item| self.lower_mod_item(&item)) + .flat_map(|items| items.0) + .collect(); + self.tree + } + + fn lower_mod_item(&mut self, item: &ast::ModuleItem) -> Option { + let attrs = Attrs::new(item, &self.hygiene); + let items = match item { + ast::ModuleItem::StructDef(ast) => { + self.lower_struct(ast).map(|data| self.tree.structs.alloc(data).into()) + } + ast::ModuleItem::UnionDef(ast) => { + self.lower_union(ast).map(|data| self.tree.unions.alloc(data).into()) + } + ast::ModuleItem::EnumDef(ast) => { + self.lower_enum(ast).map(|data| self.tree.enums.alloc(data).into()) + } + ast::ModuleItem::FnDef(ast) => { + self.lower_function(ast).map(|data| self.tree.functions.alloc(data).into()) + } + ast::ModuleItem::TypeAliasDef(ast) => { + self.lower_type_alias(ast).map(|data| self.tree.type_aliases.alloc(data).into()) + } + ast::ModuleItem::StaticDef(ast) => { + self.lower_static(ast).map(|data| self.tree.statics.alloc(data).into()) + } + ast::ModuleItem::ConstDef(ast) => { + let data = self.lower_const(ast); + Some(self.tree.consts.alloc(data).into()) + } + ast::ModuleItem::Module(ast) => { + self.lower_module(ast).map(|data| self.tree.mods.alloc(data).into()) + } + ast::ModuleItem::TraitDef(ast) => { + self.lower_trait(ast).map(|data| self.tree.traits.alloc(data).into()) + } + ast::ModuleItem::ImplDef(ast) => { + self.lower_impl(ast).map(|data| self.tree.impls.alloc(data).into()) + } + ast::ModuleItem::UseItem(ast) => Some(ModItems( + self.lower_use(ast) + .into_iter() + .map(|data| self.tree.imports.alloc(data).into()) + .collect::>(), + )), + ast::ModuleItem::ExternCrateItem(ast) => { + self.lower_extern_crate(ast).map(|data| self.tree.imports.alloc(data).into()) + } + ast::ModuleItem::MacroCall(ast) => { + self.lower_macro_call(ast).map(|data| self.tree.macro_calls.alloc(data).into()) + } + ast::ModuleItem::ExternBlock(ast) => Some(ModItems( + self.lower_extern_block(ast) + .into_iter() + .map(|item| match item { + Either::Left(func) => self.tree.functions.alloc(func).into(), + Either::Right(statik) => self.tree.statics.alloc(statik).into(), + }) + .collect::>(), + )), + }; + + if !attrs.is_empty() { + for item in items.iter().flat_map(|items| &items.0) { + self.tree.attrs.insert(*item, attrs.clone()); + } + } + + items + } + + fn lower_assoc_item(&mut self, item: &ast::AssocItem) -> Option { + match item { + ast::AssocItem::FnDef(ast) => { + self.lower_function(ast).map(|data| self.tree.functions.alloc(data).into()) + } + ast::AssocItem::TypeAliasDef(ast) => { + self.lower_type_alias(ast).map(|data| self.tree.type_aliases.alloc(data).into()) + } + ast::AssocItem::ConstDef(ast) => { + let data = self.lower_const(ast); + Some(self.tree.consts.alloc(data).into()) + } + } + } + + fn lower_struct(&mut self, strukt: &ast::StructDef) -> Option { + let attrs = self.lower_attrs(strukt); + let visibility = self.lower_visibility(strukt); + let name = strukt.name()?.as_name(); + let generic_params = self.lower_generic_params(strukt); + let fields = self.lower_fields(&strukt.kind()); + let ast_id = self.source_ast_id_map.ast_id(strukt); + let kind = match strukt.kind() { + ast::StructKind::Record(_) => StructDefKind::Record, + ast::StructKind::Tuple(_) => StructDefKind::Tuple, + ast::StructKind::Unit => StructDefKind::Unit, + }; + let res = Struct { name, attrs, visibility, generic_params, fields, ast_id, kind }; + Some(res) + } + + fn lower_fields(&mut self, strukt_kind: &ast::StructKind) -> Fields { + match strukt_kind { + ast::StructKind::Record(it) => { + let range = self.lower_record_fields(it); + Fields::Record(range) + } + ast::StructKind::Tuple(it) => { + let range = self.lower_tuple_fields(it); + Fields::Tuple(range) + } + ast::StructKind::Unit => Fields::Unit, + } + } + + fn lower_record_fields(&mut self, fields: &ast::RecordFieldDefList) -> Range> { + let start = self.next_field_idx(); + for field in fields.fields() { + if let Some(data) = self.lower_record_field(&field) { + self.tree.fields.alloc(data); + } + } + let end = self.next_field_idx(); + start..end + } + + fn lower_record_field(&self, field: &ast::RecordFieldDef) -> Option { + let name = field.name()?.as_name(); + let visibility = self.lower_visibility(field); + let type_ref = self.lower_type_ref(&field.ascribed_type()?); + let res = Field { name, type_ref, visibility }; + Some(res) + } + + fn lower_tuple_fields(&mut self, fields: &ast::TupleFieldDefList) -> Range> { + let start = self.next_field_idx(); + for (i, field) in fields.fields().enumerate() { + if let Some(data) = self.lower_tuple_field(i, &field) { + self.tree.fields.alloc(data); + } + } + let end = self.next_field_idx(); + start..end + } + + fn lower_tuple_field(&self, idx: usize, field: &ast::TupleFieldDef) -> Option { + let name = Name::new_tuple_field(idx); + let visibility = self.lower_visibility(field); + let type_ref = self.lower_type_ref(&field.type_ref()?); + let res = Field { name, type_ref, visibility }; + Some(res) + } + + fn lower_union(&mut self, union: &ast::UnionDef) -> Option { + let attrs = self.lower_attrs(union); + let visibility = self.lower_visibility(union); + let name = union.name()?.as_name(); + let generic_params = self.lower_generic_params(union); + let fields = match union.record_field_def_list() { + Some(record_field_def_list) => { + self.lower_fields(&StructKind::Record(record_field_def_list)) + } + None => Fields::Record(self.next_field_idx()..self.next_field_idx()), + }; + let ast_id = self.source_ast_id_map.ast_id(union); + let res = Union { name, attrs, visibility, generic_params, fields, ast_id }; + Some(res) + } + + fn lower_enum(&mut self, enum_: &ast::EnumDef) -> Option { + let attrs = self.lower_attrs(enum_); + let visibility = self.lower_visibility(enum_); + let name = enum_.name()?.as_name(); + let generic_params = self.lower_generic_params(enum_); + let variants = match &enum_.variant_list() { + Some(variant_list) => self.lower_variants(variant_list), + None => self.next_variant_idx()..self.next_variant_idx(), + }; + let ast_id = self.source_ast_id_map.ast_id(enum_); + let res = Enum { name, attrs, visibility, generic_params, variants, ast_id }; + Some(res) + } + + fn lower_variants(&mut self, variants: &ast::EnumVariantList) -> Range> { + let start = self.next_variant_idx(); + for variant in variants.variants() { + if let Some(data) = self.lower_variant(&variant) { + self.tree.variants.alloc(data); + } + } + let end = self.next_variant_idx(); + start..end + } + + fn lower_variant(&mut self, variant: &ast::EnumVariant) -> Option { + let name = variant.name()?.as_name(); + let fields = self.lower_fields(&variant.kind()); + let res = Variant { name, fields }; + Some(res) + } + + fn lower_function(&mut self, func: &ast::FnDef) -> Option { + let attrs = self.lower_attrs(func); + let visibility = self.lower_visibility(func); + let name = func.name()?.as_name(); + let generic_params = self.lower_generic_params(func); + + let mut params = Vec::new(); + let mut has_self_param = false; + if let Some(param_list) = func.param_list() { + if let Some(self_param) = param_list.self_param() { + let self_type = if let Some(type_ref) = self_param.ascribed_type() { + TypeRef::from_ast(&self.body_ctx, type_ref) + } else { + let self_type = TypeRef::Path(name![Self].into()); + match self_param.kind() { + ast::SelfParamKind::Owned => self_type, + ast::SelfParamKind::Ref => { + TypeRef::Reference(Box::new(self_type), Mutability::Shared) + } + ast::SelfParamKind::MutRef => { + TypeRef::Reference(Box::new(self_type), Mutability::Mut) + } + } + }; + params.push(self_type); + has_self_param = true; + } + for param in param_list.params() { + let type_ref = TypeRef::from_ast_opt(&self.body_ctx, param.ascribed_type()); + params.push(type_ref); + } + } + let ret_type = match func.ret_type().and_then(|rt| rt.type_ref()) { + Some(type_ref) => TypeRef::from_ast(&self.body_ctx, type_ref), + _ => TypeRef::unit(), + }; + + let ret_type = if func.async_token().is_some() { + let future_impl = desugar_future_path(ret_type); + let ty_bound = TypeBound::Path(future_impl); + TypeRef::ImplTrait(vec![ty_bound]) + } else { + ret_type + }; + + let ast_id = self.source_ast_id_map.ast_id(func); + let res = Function { + name, + attrs, + visibility, + generic_params, + has_self_param, + params, + ret_type, + ast_id, + }; + Some(res) + } + + fn lower_type_alias(&mut self, type_alias: &ast::TypeAliasDef) -> Option { + let name = type_alias.name()?.as_name(); + let type_ref = type_alias.type_ref().map(|it| self.lower_type_ref(&it)); + let visibility = self.lower_visibility(type_alias); + let generic_params = self.lower_generic_params(type_alias); + let ast_id = self.source_ast_id_map.ast_id(type_alias); + let res = TypeAlias { name, visibility, generic_params, type_ref, ast_id }; + Some(res) + } + + fn lower_static(&mut self, static_: &ast::StaticDef) -> Option { + let name = static_.name()?.as_name(); + let type_ref = self.lower_type_ref_opt(static_.ascribed_type()); + let visibility = self.lower_visibility(static_); + let ast_id = self.source_ast_id_map.ast_id(static_); + let res = Static { name, visibility, type_ref, ast_id }; + Some(res) + } + + fn lower_const(&mut self, konst: &ast::ConstDef) -> Const { + let name = konst.name().map(|it| it.as_name()); + let type_ref = self.lower_type_ref_opt(konst.ascribed_type()); + let visibility = self.lower_visibility(konst); + let ast_id = self.source_ast_id_map.ast_id(konst); + Const { name, visibility, type_ref, ast_id } + } + + fn lower_module(&mut self, module: &ast::Module) -> Option { + let name = module.name()?.as_name(); + let visibility = self.lower_visibility(module); + let kind = if module.semicolon_token().is_some() { + ModKind::Outline {} + } else { + ModKind::Inline { + items: module + .item_list() + .map(|list| { + list.items() + .flat_map(|item| self.lower_mod_item(&item)) + .flat_map(|items| items.0) + .collect() + }) + .unwrap_or_else(|| { + mark::hit!(name_res_works_for_broken_modules); + Vec::new() + }), + } + }; + let ast_id = self.source_ast_id_map.ast_id(module); + Some(Mod { name, visibility, kind, ast_id }) + } + + fn lower_trait(&mut self, trait_def: &ast::TraitDef) -> Option { + let name = trait_def.name()?.as_name(); + let visibility = self.lower_visibility(trait_def); + let generic_params = self.lower_generic_params(trait_def); + let auto = trait_def.auto_token().is_some(); + let items = trait_def.item_list().map(|list| { + // FIXME: Does not handle macros + list.assoc_items().flat_map(|item| self.lower_assoc_item(&item)).collect() + }); + let ast_id = self.source_ast_id_map.ast_id(trait_def); + Some(Trait { + name, + visibility, + generic_params, + auto, + items: items.unwrap_or_default(), + ast_id, + }) + } + + fn lower_impl(&mut self, impl_def: &ast::ImplDef) -> Option { + let generic_params = self.lower_generic_params(impl_def); + let target_trait = impl_def.target_trait().map(|tr| self.lower_type_ref(&tr)); + let target_type = self.lower_type_ref(&impl_def.target_type()?); + let is_negative = impl_def.excl_token().is_some(); + let items = impl_def + .item_list()? + .assoc_items() + .filter_map(|item| self.lower_assoc_item(&item)) + .collect(); + let ast_id = self.source_ast_id_map.ast_id(impl_def); + Some(Impl { generic_params, target_trait, target_type, is_negative, items, ast_id }) + } + + fn lower_use(&mut self, use_item: &ast::UseItem) -> Vec { + // FIXME: cfg_attr + let is_prelude = use_item.has_atom_attr("prelude_import"); + let visibility = self.lower_visibility(use_item); + + // Every use item can expand to many `Import`s. + let mut imports = Vec::new(); + ModPath::expand_use_item( + InFile::new(self.file, use_item.clone()), + &self.hygiene, + |path, _tree, is_glob, alias| { + imports.push(Import { + path, + alias, + visibility: visibility.clone(), + is_glob, + is_prelude, + is_extern_crate: false, + is_macro_use: false, + }); + }, + ); + + imports + } + + fn lower_extern_crate(&mut self, extern_crate: &ast::ExternCrateItem) -> Option { + let path = ModPath::from_name_ref(&extern_crate.name_ref()?); + let alias = extern_crate.alias().map(|a| { + a.name().map(|it| it.as_name()).map_or(ImportAlias::Underscore, ImportAlias::Alias) + }); + let visibility = self.lower_visibility(extern_crate); + // FIXME: cfg_attr + let is_macro_use = extern_crate.has_atom_attr("macro_use"); + + Some(Import { + path, + alias, + visibility, + is_glob: false, + is_prelude: false, + is_extern_crate: true, + is_macro_use, + }) + } + + fn lower_macro_call(&mut self, m: &ast::MacroCall) -> Option { + let name = m.name().map(|it| it.as_name()); + let attrs = Attrs::new(m, &self.hygiene); + let path = ModPath::from_src(m.path()?, &self.hygiene)?; + + let ast_id = self.source_ast_id_map.ast_id(m); + + // FIXME: cfg_attr + let export_attr = attrs.by_key("macro_export"); + + let is_export = export_attr.exists(); + let is_local_inner = if is_export { + export_attr.tt_values().map(|it| &it.token_trees).flatten().any(|it| match it { + tt::TokenTree::Leaf(tt::Leaf::Ident(ident)) => { + ident.text.contains("local_inner_macros") + } + _ => false, + }) + } else { + false + }; + + let is_builtin = attrs.by_key("rustc_builtin_macro").exists(); + Some(MacroCall { name, path, is_export, is_builtin, is_local_inner, ast_id }) + } + + fn lower_extern_block(&mut self, block: &ast::ExternBlock) -> Vec> { + block.extern_item_list().map_or(Vec::new(), |list| { + list.extern_items() + .filter_map(|item| match item { + ast::ExternItem::FnDef(ast) => self.lower_function(&ast).map(Either::Left), + ast::ExternItem::StaticDef(ast) => self.lower_static(&ast).map(Either::Right), + }) + .collect() + }) + } + + fn lower_generic_params( + &mut self, + _item: &impl ast::TypeParamsOwner, + ) -> generics::GenericParams { + // TODO + generics::GenericParams { types: Arena::new(), where_predicates: Vec::new() } + } + + fn lower_attrs(&self, item: &impl ast::AttrsOwner) -> Attrs { + Attrs::new(item, &self.hygiene) + } + fn lower_visibility(&self, item: &impl ast::VisibilityOwner) -> RawVisibility { + RawVisibility::from_ast_with_hygiene(item.visibility(), &self.hygiene) + } + fn lower_type_ref(&self, type_ref: &ast::TypeRef) -> TypeRef { + TypeRef::from_ast(&self.body_ctx, type_ref.clone()) + } + fn lower_type_ref_opt(&self, type_ref: Option) -> TypeRef { + TypeRef::from_ast_opt(&self.body_ctx, type_ref) + } + + fn next_field_idx(&self) -> Idx { + Idx::from_raw(RawId::from(self.tree.fields.len() as u32)) + } + fn next_variant_idx(&self) -> Idx { + Idx::from_raw(RawId::from(self.tree.variants.len() as u32)) + } +} + +fn desugar_future_path(orig: TypeRef) -> Path { + let path = path![core::future::Future]; + let mut generic_args: Vec<_> = std::iter::repeat(None).take(path.segments.len() - 1).collect(); + let mut last = GenericArgs::empty(); + let binding = + AssociatedTypeBinding { name: name![Output], type_ref: Some(orig), bounds: Vec::new() }; + last.bindings.push(binding); + generic_args.push(Some(Arc::new(last))); + + Path::from_known_path(path, generic_args) +} -- cgit v1.2.3