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-rw-r--r--crates/ra_hir_def/src/item_tree.rs517
1 files changed, 12 insertions, 505 deletions
diff --git a/crates/ra_hir_def/src/item_tree.rs b/crates/ra_hir_def/src/item_tree.rs
index 245ee5e62..a13a989dd 100644
--- a/crates/ra_hir_def/src/item_tree.rs
+++ b/crates/ra_hir_def/src/item_tree.rs
@@ -1,13 +1,23 @@
1//! A simplified AST that only contains items. 1//! A simplified AST that only contains items.
2 2
3mod lower;
4
5use std::{
6 ops::{Index, Range},
7 sync::Arc,
8};
9
10use ast::{AstNode, AttrsOwner, ModuleItemOwner, NameOwner, StructKind, TypeAscriptionOwner};
11use either::Either;
3use hir_expand::{ 12use hir_expand::{
4 ast_id_map::{AstIdMap, FileAstId}, 13 ast_id_map::FileAstId,
5 hygiene::Hygiene, 14 hygiene::Hygiene,
6 name::{name, AsName, Name}, 15 name::{name, AsName, Name},
7 HirFileId, InFile, 16 HirFileId, InFile,
8}; 17};
9use ra_arena::{Arena, Idx, RawId}; 18use ra_arena::{Arena, Idx, RawId};
10use ra_syntax::{ast, match_ast}; 19use ra_syntax::{ast, match_ast};
20use rustc_hash::FxHashMap;
11use test_utils::mark; 21use test_utils::mark;
12 22
13use crate::{ 23use crate::{
@@ -18,14 +28,6 @@ use crate::{
18 type_ref::{Mutability, TypeBound, TypeRef}, 28 type_ref::{Mutability, TypeBound, TypeRef},
19 visibility::RawVisibility, 29 visibility::RawVisibility,
20}; 30};
21use ast::{AstNode, AttrsOwner, ModuleItemOwner, NameOwner, StructKind, TypeAscriptionOwner};
22use either::Either;
23use rustc_hash::FxHashMap;
24use smallvec::SmallVec;
25use std::{
26 ops::{Index, Range},
27 sync::Arc,
28};
29 31
30/// The item tree of a source file. 32/// The item tree of a source file.
31#[derive(Debug, Default, Eq, PartialEq)] 33#[derive(Debug, Default, Eq, PartialEq)]
@@ -80,7 +82,7 @@ impl ItemTree {
80 }; 82 };
81 83
82 let map = db.ast_id_map(file_id); 84 let map = db.ast_id_map(file_id);
83 let mut ctx = Ctx { 85 let mut ctx = lower::Ctx {
84 tree: ItemTree::default(), 86 tree: ItemTree::default(),
85 hygiene, 87 hygiene,
86 file: file_id, 88 file: file_id,
@@ -366,498 +368,3 @@ pub struct Field {
366 pub type_ref: TypeRef, 368 pub type_ref: TypeRef,
367 pub visibility: RawVisibility, 369 pub visibility: RawVisibility,
368} 370}
369
370struct ModItems(SmallVec<[ModItem; 1]>);
371
372impl<T> From<T> for ModItems
373where
374 T: Into<ModItem>,
375{
376 fn from(t: T) -> Self {
377 ModItems(SmallVec::from_buf([t.into(); 1]))
378 }
379}
380
381struct Ctx {
382 tree: ItemTree,
383 hygiene: Hygiene,
384 file: HirFileId,
385 source_ast_id_map: Arc<AstIdMap>,
386 body_ctx: crate::body::LowerCtx,
387}
388
389impl Ctx {
390 fn lower(mut self, item_owner: &dyn ModuleItemOwner) -> ItemTree {
391 self.tree.top_level = item_owner
392 .items()
393 .flat_map(|item| self.lower_mod_item(&item))
394 .flat_map(|items| items.0)
395 .collect();
396 self.tree
397 }
398
399 fn lower_mod_item(&mut self, item: &ast::ModuleItem) -> Option<ModItems> {
400 let attrs = Attrs::new(item, &self.hygiene);
401 let items = match item {
402 ast::ModuleItem::StructDef(ast) => {
403 self.lower_struct(ast).map(|data| self.tree.structs.alloc(data).into())
404 }
405 ast::ModuleItem::UnionDef(ast) => {
406 self.lower_union(ast).map(|data| self.tree.unions.alloc(data).into())
407 }
408 ast::ModuleItem::EnumDef(ast) => {
409 self.lower_enum(ast).map(|data| self.tree.enums.alloc(data).into())
410 }
411 ast::ModuleItem::FnDef(ast) => {
412 self.lower_function(ast).map(|data| self.tree.functions.alloc(data).into())
413 }
414 ast::ModuleItem::TypeAliasDef(ast) => {
415 self.lower_type_alias(ast).map(|data| self.tree.type_aliases.alloc(data).into())
416 }
417 ast::ModuleItem::StaticDef(ast) => {
418 self.lower_static(ast).map(|data| self.tree.statics.alloc(data).into())
419 }
420 ast::ModuleItem::ConstDef(ast) => {
421 let data = self.lower_const(ast);
422 Some(self.tree.consts.alloc(data).into())
423 }
424 ast::ModuleItem::Module(ast) => {
425 self.lower_module(ast).map(|data| self.tree.mods.alloc(data).into())
426 }
427 ast::ModuleItem::TraitDef(ast) => {
428 self.lower_trait(ast).map(|data| self.tree.traits.alloc(data).into())
429 }
430 ast::ModuleItem::ImplDef(ast) => {
431 self.lower_impl(ast).map(|data| self.tree.impls.alloc(data).into())
432 }
433 ast::ModuleItem::UseItem(ast) => Some(ModItems(
434 self.lower_use(ast)
435 .into_iter()
436 .map(|data| self.tree.imports.alloc(data).into())
437 .collect::<SmallVec<_>>(),
438 )),
439 ast::ModuleItem::ExternCrateItem(ast) => {
440 self.lower_extern_crate(ast).map(|data| self.tree.imports.alloc(data).into())
441 }
442 ast::ModuleItem::MacroCall(ast) => {
443 self.lower_macro_call(ast).map(|data| self.tree.macro_calls.alloc(data).into())
444 }
445 ast::ModuleItem::ExternBlock(ast) => Some(ModItems(
446 self.lower_extern_block(ast)
447 .into_iter()
448 .map(|item| match item {
449 Either::Left(func) => self.tree.functions.alloc(func).into(),
450 Either::Right(statik) => self.tree.statics.alloc(statik).into(),
451 })
452 .collect::<SmallVec<_>>(),
453 )),
454 };
455
456 if !attrs.is_empty() {
457 for item in items.iter().flat_map(|items| &items.0) {
458 self.tree.attrs.insert(*item, attrs.clone());
459 }
460 }
461
462 items
463 }
464
465 fn lower_assoc_item(&mut self, item: &ast::AssocItem) -> Option<AssocItem> {
466 match item {
467 ast::AssocItem::FnDef(ast) => {
468 self.lower_function(ast).map(|data| self.tree.functions.alloc(data).into())
469 }
470 ast::AssocItem::TypeAliasDef(ast) => {
471 self.lower_type_alias(ast).map(|data| self.tree.type_aliases.alloc(data).into())
472 }
473 ast::AssocItem::ConstDef(ast) => {
474 let data = self.lower_const(ast);
475 Some(self.tree.consts.alloc(data).into())
476 }
477 }
478 }
479
480 fn lower_struct(&mut self, strukt: &ast::StructDef) -> Option<Struct> {
481 let attrs = self.lower_attrs(strukt);
482 let visibility = self.lower_visibility(strukt);
483 let name = strukt.name()?.as_name();
484 let generic_params = self.lower_generic_params(strukt);
485 let fields = self.lower_fields(&strukt.kind());
486 let ast_id = self.source_ast_id_map.ast_id(strukt);
487 let kind = match strukt.kind() {
488 ast::StructKind::Record(_) => StructDefKind::Record,
489 ast::StructKind::Tuple(_) => StructDefKind::Tuple,
490 ast::StructKind::Unit => StructDefKind::Unit,
491 };
492 let res = Struct { name, attrs, visibility, generic_params, fields, ast_id, kind };
493 Some(res)
494 }
495
496 fn lower_fields(&mut self, strukt_kind: &ast::StructKind) -> Fields {
497 match strukt_kind {
498 ast::StructKind::Record(it) => {
499 let range = self.lower_record_fields(it);
500 Fields::Record(range)
501 }
502 ast::StructKind::Tuple(it) => {
503 let range = self.lower_tuple_fields(it);
504 Fields::Tuple(range)
505 }
506 ast::StructKind::Unit => Fields::Unit,
507 }
508 }
509
510 fn lower_record_fields(&mut self, fields: &ast::RecordFieldDefList) -> Range<Idx<Field>> {
511 let start = self.next_field_idx();
512 for field in fields.fields() {
513 if let Some(data) = self.lower_record_field(&field) {
514 self.tree.fields.alloc(data);
515 }
516 }
517 let end = self.next_field_idx();
518 start..end
519 }
520
521 fn lower_record_field(&self, field: &ast::RecordFieldDef) -> Option<Field> {
522 let name = field.name()?.as_name();
523 let visibility = self.lower_visibility(field);
524 let type_ref = self.lower_type_ref(&field.ascribed_type()?);
525 let res = Field { name, type_ref, visibility };
526 Some(res)
527 }
528
529 fn lower_tuple_fields(&mut self, fields: &ast::TupleFieldDefList) -> Range<Idx<Field>> {
530 let start = self.next_field_idx();
531 for (i, field) in fields.fields().enumerate() {
532 if let Some(data) = self.lower_tuple_field(i, &field) {
533 self.tree.fields.alloc(data);
534 }
535 }
536 let end = self.next_field_idx();
537 start..end
538 }
539
540 fn lower_tuple_field(&self, idx: usize, field: &ast::TupleFieldDef) -> Option<Field> {
541 let name = Name::new_tuple_field(idx);
542 let visibility = self.lower_visibility(field);
543 let type_ref = self.lower_type_ref(&field.type_ref()?);
544 let res = Field { name, type_ref, visibility };
545 Some(res)
546 }
547
548 fn lower_union(&mut self, union: &ast::UnionDef) -> Option<Union> {
549 let attrs = self.lower_attrs(union);
550 let visibility = self.lower_visibility(union);
551 let name = union.name()?.as_name();
552 let generic_params = self.lower_generic_params(union);
553 let fields = match union.record_field_def_list() {
554 Some(record_field_def_list) => {
555 self.lower_fields(&StructKind::Record(record_field_def_list))
556 }
557 None => Fields::Record(self.next_field_idx()..self.next_field_idx()),
558 };
559 let ast_id = self.source_ast_id_map.ast_id(union);
560 let res = Union { name, attrs, visibility, generic_params, fields, ast_id };
561 Some(res)
562 }
563
564 fn lower_enum(&mut self, enum_: &ast::EnumDef) -> Option<Enum> {
565 let attrs = self.lower_attrs(enum_);
566 let visibility = self.lower_visibility(enum_);
567 let name = enum_.name()?.as_name();
568 let generic_params = self.lower_generic_params(enum_);
569 let variants = match &enum_.variant_list() {
570 Some(variant_list) => self.lower_variants(variant_list),
571 None => self.next_variant_idx()..self.next_variant_idx(),
572 };
573 let ast_id = self.source_ast_id_map.ast_id(enum_);
574 let res = Enum { name, attrs, visibility, generic_params, variants, ast_id };
575 Some(res)
576 }
577
578 fn lower_variants(&mut self, variants: &ast::EnumVariantList) -> Range<Idx<Variant>> {
579 let start = self.next_variant_idx();
580 for variant in variants.variants() {
581 if let Some(data) = self.lower_variant(&variant) {
582 self.tree.variants.alloc(data);
583 }
584 }
585 let end = self.next_variant_idx();
586 start..end
587 }
588
589 fn lower_variant(&mut self, variant: &ast::EnumVariant) -> Option<Variant> {
590 let name = variant.name()?.as_name();
591 let fields = self.lower_fields(&variant.kind());
592 let res = Variant { name, fields };
593 Some(res)
594 }
595
596 fn lower_function(&mut self, func: &ast::FnDef) -> Option<Function> {
597 let attrs = self.lower_attrs(func);
598 let visibility = self.lower_visibility(func);
599 let name = func.name()?.as_name();
600 let generic_params = self.lower_generic_params(func);
601
602 let mut params = Vec::new();
603 let mut has_self_param = false;
604 if let Some(param_list) = func.param_list() {
605 if let Some(self_param) = param_list.self_param() {
606 let self_type = if let Some(type_ref) = self_param.ascribed_type() {
607 TypeRef::from_ast(&self.body_ctx, type_ref)
608 } else {
609 let self_type = TypeRef::Path(name![Self].into());
610 match self_param.kind() {
611 ast::SelfParamKind::Owned => self_type,
612 ast::SelfParamKind::Ref => {
613 TypeRef::Reference(Box::new(self_type), Mutability::Shared)
614 }
615 ast::SelfParamKind::MutRef => {
616 TypeRef::Reference(Box::new(self_type), Mutability::Mut)
617 }
618 }
619 };
620 params.push(self_type);
621 has_self_param = true;
622 }
623 for param in param_list.params() {
624 let type_ref = TypeRef::from_ast_opt(&self.body_ctx, param.ascribed_type());
625 params.push(type_ref);
626 }
627 }
628 let ret_type = match func.ret_type().and_then(|rt| rt.type_ref()) {
629 Some(type_ref) => TypeRef::from_ast(&self.body_ctx, type_ref),
630 _ => TypeRef::unit(),
631 };
632
633 let ret_type = if func.async_token().is_some() {
634 let future_impl = desugar_future_path(ret_type);
635 let ty_bound = TypeBound::Path(future_impl);
636 TypeRef::ImplTrait(vec![ty_bound])
637 } else {
638 ret_type
639 };
640
641 let ast_id = self.source_ast_id_map.ast_id(func);
642 let res = Function {
643 name,
644 attrs,
645 visibility,
646 generic_params,
647 has_self_param,
648 params,
649 ret_type,
650 ast_id,
651 };
652 Some(res)
653 }
654
655 fn lower_type_alias(&mut self, type_alias: &ast::TypeAliasDef) -> Option<TypeAlias> {
656 let name = type_alias.name()?.as_name();
657 let type_ref = type_alias.type_ref().map(|it| self.lower_type_ref(&it));
658 let visibility = self.lower_visibility(type_alias);
659 let generic_params = self.lower_generic_params(type_alias);
660 let ast_id = self.source_ast_id_map.ast_id(type_alias);
661 let res = TypeAlias { name, visibility, generic_params, type_ref, ast_id };
662 Some(res)
663 }
664
665 fn lower_static(&mut self, static_: &ast::StaticDef) -> Option<Static> {
666 let name = static_.name()?.as_name();
667 let type_ref = self.lower_type_ref_opt(static_.ascribed_type());
668 let visibility = self.lower_visibility(static_);
669 let ast_id = self.source_ast_id_map.ast_id(static_);
670 let res = Static { name, visibility, type_ref, ast_id };
671 Some(res)
672 }
673
674 fn lower_const(&mut self, konst: &ast::ConstDef) -> Const {
675 let name = konst.name().map(|it| it.as_name());
676 let type_ref = self.lower_type_ref_opt(konst.ascribed_type());
677 let visibility = self.lower_visibility(konst);
678 let ast_id = self.source_ast_id_map.ast_id(konst);
679 Const { name, visibility, type_ref, ast_id }
680 }
681
682 fn lower_module(&mut self, module: &ast::Module) -> Option<Mod> {
683 let name = module.name()?.as_name();
684 let visibility = self.lower_visibility(module);
685 let kind = if module.semicolon_token().is_some() {
686 ModKind::Outline {}
687 } else {
688 ModKind::Inline {
689 items: module
690 .item_list()
691 .map(|list| {
692 list.items()
693 .flat_map(|item| self.lower_mod_item(&item))
694 .flat_map(|items| items.0)
695 .collect()
696 })
697 .unwrap_or_else(|| {
698 mark::hit!(name_res_works_for_broken_modules);
699 Vec::new()
700 }),
701 }
702 };
703 let ast_id = self.source_ast_id_map.ast_id(module);
704 Some(Mod { name, visibility, kind, ast_id })
705 }
706
707 fn lower_trait(&mut self, trait_def: &ast::TraitDef) -> Option<Trait> {
708 let name = trait_def.name()?.as_name();
709 let visibility = self.lower_visibility(trait_def);
710 let generic_params = self.lower_generic_params(trait_def);
711 let auto = trait_def.auto_token().is_some();
712 let items = trait_def.item_list().map(|list| {
713 // FIXME: Does not handle macros
714 list.assoc_items().flat_map(|item| self.lower_assoc_item(&item)).collect()
715 });
716 let ast_id = self.source_ast_id_map.ast_id(trait_def);
717 Some(Trait {
718 name,
719 visibility,
720 generic_params,
721 auto,
722 items: items.unwrap_or_default(),
723 ast_id,
724 })
725 }
726
727 fn lower_impl(&mut self, impl_def: &ast::ImplDef) -> Option<Impl> {
728 let generic_params = self.lower_generic_params(impl_def);
729 let target_trait = impl_def.target_trait().map(|tr| self.lower_type_ref(&tr));
730 let target_type = self.lower_type_ref(&impl_def.target_type()?);
731 let is_negative = impl_def.excl_token().is_some();
732 let items = impl_def
733 .item_list()?
734 .assoc_items()
735 .filter_map(|item| self.lower_assoc_item(&item))
736 .collect();
737 let ast_id = self.source_ast_id_map.ast_id(impl_def);
738 Some(Impl { generic_params, target_trait, target_type, is_negative, items, ast_id })
739 }
740
741 fn lower_use(&mut self, use_item: &ast::UseItem) -> Vec<Import> {
742 // FIXME: cfg_attr
743 let is_prelude = use_item.has_atom_attr("prelude_import");
744 let visibility = self.lower_visibility(use_item);
745
746 // Every use item can expand to many `Import`s.
747 let mut imports = Vec::new();
748 ModPath::expand_use_item(
749 InFile::new(self.file, use_item.clone()),
750 &self.hygiene,
751 |path, _tree, is_glob, alias| {
752 imports.push(Import {
753 path,
754 alias,
755 visibility: visibility.clone(),
756 is_glob,
757 is_prelude,
758 is_extern_crate: false,
759 is_macro_use: false,
760 });
761 },
762 );
763
764 imports
765 }
766
767 fn lower_extern_crate(&mut self, extern_crate: &ast::ExternCrateItem) -> Option<Import> {
768 let path = ModPath::from_name_ref(&extern_crate.name_ref()?);
769 let alias = extern_crate.alias().map(|a| {
770 a.name().map(|it| it.as_name()).map_or(ImportAlias::Underscore, ImportAlias::Alias)
771 });
772 let visibility = self.lower_visibility(extern_crate);
773 // FIXME: cfg_attr
774 let is_macro_use = extern_crate.has_atom_attr("macro_use");
775
776 Some(Import {
777 path,
778 alias,
779 visibility,
780 is_glob: false,
781 is_prelude: false,
782 is_extern_crate: true,
783 is_macro_use,
784 })
785 }
786
787 fn lower_macro_call(&mut self, m: &ast::MacroCall) -> Option<MacroCall> {
788 let name = m.name().map(|it| it.as_name());
789 let attrs = Attrs::new(m, &self.hygiene);
790 let path = ModPath::from_src(m.path()?, &self.hygiene)?;
791
792 let ast_id = self.source_ast_id_map.ast_id(m);
793
794 // FIXME: cfg_attr
795 let export_attr = attrs.by_key("macro_export");
796
797 let is_export = export_attr.exists();
798 let is_local_inner = if is_export {
799 export_attr.tt_values().map(|it| &it.token_trees).flatten().any(|it| match it {
800 tt::TokenTree::Leaf(tt::Leaf::Ident(ident)) => {
801 ident.text.contains("local_inner_macros")
802 }
803 _ => false,
804 })
805 } else {
806 false
807 };
808
809 let is_builtin = attrs.by_key("rustc_builtin_macro").exists();
810 Some(MacroCall { name, path, is_export, is_builtin, is_local_inner, ast_id })
811 }
812
813 fn lower_extern_block(&mut self, block: &ast::ExternBlock) -> Vec<Either<Function, Static>> {
814 block.extern_item_list().map_or(Vec::new(), |list| {
815 list.extern_items()
816 .filter_map(|item| match item {
817 ast::ExternItem::FnDef(ast) => self.lower_function(&ast).map(Either::Left),
818 ast::ExternItem::StaticDef(ast) => self.lower_static(&ast).map(Either::Right),
819 })
820 .collect()
821 })
822 }
823
824 fn lower_generic_params(
825 &mut self,
826 _item: &impl ast::TypeParamsOwner,
827 ) -> generics::GenericParams {
828 // TODO
829 generics::GenericParams { types: Arena::new(), where_predicates: Vec::new() }
830 }
831
832 fn lower_attrs(&self, item: &impl ast::AttrsOwner) -> Attrs {
833 Attrs::new(item, &self.hygiene)
834 }
835 fn lower_visibility(&self, item: &impl ast::VisibilityOwner) -> RawVisibility {
836 RawVisibility::from_ast_with_hygiene(item.visibility(), &self.hygiene)
837 }
838 fn lower_type_ref(&self, type_ref: &ast::TypeRef) -> TypeRef {
839 TypeRef::from_ast(&self.body_ctx, type_ref.clone())
840 }
841 fn lower_type_ref_opt(&self, type_ref: Option<ast::TypeRef>) -> TypeRef {
842 TypeRef::from_ast_opt(&self.body_ctx, type_ref)
843 }
844
845 fn next_field_idx(&self) -> Idx<Field> {
846 Idx::from_raw(RawId::from(self.tree.fields.len() as u32))
847 }
848 fn next_variant_idx(&self) -> Idx<Variant> {
849 Idx::from_raw(RawId::from(self.tree.variants.len() as u32))
850 }
851}
852
853fn desugar_future_path(orig: TypeRef) -> Path {
854 let path = path![core::future::Future];
855 let mut generic_args: Vec<_> = std::iter::repeat(None).take(path.segments.len() - 1).collect();
856 let mut last = GenericArgs::empty();
857 let binding =
858 AssociatedTypeBinding { name: name![Output], type_ref: Some(orig), bounds: Vec::new() };
859 last.bindings.push(binding);
860 generic_args.push(Some(Arc::new(last)));
861
862 Path::from_known_path(path, generic_args)
863}
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