1 //! Contains basic data about various HIR declarations.
3 use std::{mem, sync::Arc};
5 use hir_expand::{name::Name, AstId, ExpandResult, HirFileId, InFile, MacroCallId};
10 body::{Expander, Mark},
13 item_tree::{self, AssocItem, FnFlags, ItemTreeId, ModItem, Param, TreeId},
14 nameres::{attr_resolution::ResolvedAttr, DefMap},
15 type_ref::{TraitRef, TypeBound, TypeRef},
16 visibility::RawVisibility,
17 AssocItemId, AstIdWithPath, ConstId, ConstLoc, FunctionId, FunctionLoc, HasModule, ImplId,
18 Intern, ItemContainerId, Lookup, ModuleId, StaticId, TraitId, TypeAliasId, TypeAliasLoc,
21 #[derive(Debug, Clone, PartialEq, Eq)]
22 pub struct FunctionData {
24 pub params: Vec<(Option<Name>, Interned<TypeRef>)>,
25 pub ret_type: Interned<TypeRef>,
26 pub async_ret_type: Option<Interned<TypeRef>>,
28 pub visibility: RawVisibility,
29 pub abi: Option<Interned<str>>,
30 pub legacy_const_generics_indices: Vec<u32>,
35 pub(crate) fn fn_data_query(db: &dyn DefDatabase, func: FunctionId) -> Arc<FunctionData> {
36 let loc = func.lookup(db);
37 let krate = loc.container.module(db).krate;
38 let crate_graph = db.crate_graph();
39 let cfg_options = &crate_graph[krate].cfg_options;
40 let item_tree = loc.id.item_tree(db);
41 let func = &item_tree[loc.id.value];
43 let enabled_params = func
46 .filter(|¶m| item_tree.attrs(db, krate, param.into()).is_cfg_enabled(cfg_options));
48 // If last cfg-enabled param is a `...` param, it's a varargs function.
49 let is_varargs = enabled_params
52 .map_or(false, |param| matches!(item_tree[param], Param::Varargs));
54 let mut flags = func.flags;
56 flags.bits |= FnFlags::IS_VARARGS;
59 if matches!(loc.container, ItemContainerId::ExternBlockId(_)) {
60 flags.bits |= FnFlags::IS_IN_EXTERN_BLOCK;
63 let legacy_const_generics_indices = item_tree
64 .attrs(db, krate, ModItem::from(loc.id.value).into())
65 .by_key("rustc_legacy_const_generics")
68 .map(|arg| parse_rustc_legacy_const_generics(arg))
71 Arc::new(FunctionData {
72 name: func.name.clone(),
73 params: enabled_params
75 .filter_map(|id| match &item_tree[id] {
76 Param::Normal(name, ty) => Some((name.clone(), ty.clone())),
77 Param::Varargs => None,
80 ret_type: func.ret_type.clone(),
81 async_ret_type: func.async_ret_type.clone(),
82 attrs: item_tree.attrs(db, krate, ModItem::from(loc.id.value).into()),
83 visibility: item_tree[func.visibility].clone(),
84 abi: func.abi.clone(),
85 legacy_const_generics_indices,
90 pub fn has_body(&self) -> bool {
91 self.flags.bits & FnFlags::HAS_BODY != 0
94 /// True if the first param is `self`. This is relevant to decide whether this
95 /// can be called as a method.
96 pub fn has_self_param(&self) -> bool {
97 self.flags.bits & FnFlags::HAS_SELF_PARAM != 0
100 pub fn is_default(&self) -> bool {
101 self.flags.bits & FnFlags::IS_DEFAULT != 0
104 pub fn is_const(&self) -> bool {
105 self.flags.bits & FnFlags::IS_CONST != 0
108 pub fn is_async(&self) -> bool {
109 self.flags.bits & FnFlags::IS_ASYNC != 0
112 pub fn is_unsafe(&self) -> bool {
113 self.flags.bits & FnFlags::IS_UNSAFE != 0
116 pub fn is_in_extern_block(&self) -> bool {
117 self.flags.bits & FnFlags::IS_IN_EXTERN_BLOCK != 0
120 pub fn is_varargs(&self) -> bool {
121 self.flags.bits & FnFlags::IS_VARARGS != 0
125 fn parse_rustc_legacy_const_generics(tt: &tt::Subtree) -> Vec<u32> {
126 let mut indices = Vec::new();
127 for args in tt.token_trees.chunks(2) {
129 tt::TokenTree::Leaf(tt::Leaf::Literal(lit)) => match lit.text.parse() {
130 Ok(index) => indices.push(index),
136 if let Some(comma) = args.get(1) {
138 tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) if punct.char == ',' => {}
147 #[derive(Debug, Clone, PartialEq, Eq)]
148 pub struct TypeAliasData {
150 pub type_ref: Option<Interned<TypeRef>>,
151 pub visibility: RawVisibility,
153 /// Bounds restricting the type alias itself (eg. `type Ty: Bound;` in a trait or impl).
154 pub bounds: Vec<Interned<TypeBound>>,
158 pub(crate) fn type_alias_data_query(
159 db: &dyn DefDatabase,
161 ) -> Arc<TypeAliasData> {
162 let loc = typ.lookup(db);
163 let item_tree = loc.id.item_tree(db);
164 let typ = &item_tree[loc.id.value];
166 Arc::new(TypeAliasData {
167 name: typ.name.clone(),
168 type_ref: typ.type_ref.clone(),
169 visibility: item_tree[typ.visibility].clone(),
170 is_extern: matches!(loc.container, ItemContainerId::ExternBlockId(_)),
171 bounds: typ.bounds.to_vec(),
176 #[derive(Debug, Clone, PartialEq, Eq)]
177 pub struct TraitData {
179 pub items: Vec<(Name, AssocItemId)>,
182 pub visibility: RawVisibility,
183 /// Whether the trait has `#[rust_skip_array_during_method_dispatch]`. `hir_ty` will ignore
184 /// method calls to this trait's methods when the receiver is an array and the crate edition is
186 pub skip_array_during_method_dispatch: bool,
187 // box it as the vec is usually empty anyways
188 pub attribute_calls: Option<Box<Vec<(AstId<ast::Item>, MacroCallId)>>>,
192 pub(crate) fn trait_data_query(db: &dyn DefDatabase, tr: TraitId) -> Arc<TraitData> {
193 let tr_loc = tr.lookup(db);
194 let item_tree = tr_loc.id.item_tree(db);
195 let tr_def = &item_tree[tr_loc.id.value];
196 let _cx = stdx::panic_context::enter(format!(
197 "trait_data_query({:?} -> {:?} -> {:?})",
200 let name = tr_def.name.clone();
201 let is_auto = tr_def.is_auto;
202 let is_unsafe = tr_def.is_unsafe;
203 let module_id = tr_loc.container;
204 let visibility = item_tree[tr_def.visibility].clone();
205 let skip_array_during_method_dispatch = item_tree
206 .attrs(db, tr_loc.container.krate(), ModItem::from(tr_loc.id.value).into())
207 .by_key("rustc_skip_array_during_method_dispatch")
210 let mut collector = AssocItemCollector::new(
214 ItemContainerId::TraitId(tr),
216 collector.collect(tr_loc.id.tree_id(), &tr_def.items);
220 attribute_calls: collector.take_attr_calls(),
221 items: collector.items,
225 skip_array_during_method_dispatch,
229 pub fn associated_types(&self) -> impl Iterator<Item = TypeAliasId> + '_ {
230 self.items.iter().filter_map(|(_name, item)| match item {
231 AssocItemId::TypeAliasId(t) => Some(*t),
236 pub fn associated_type_by_name(&self, name: &Name) -> Option<TypeAliasId> {
237 self.items.iter().find_map(|(item_name, item)| match item {
238 AssocItemId::TypeAliasId(t) if item_name == name => Some(*t),
243 pub fn method_by_name(&self, name: &Name) -> Option<FunctionId> {
244 self.items.iter().find_map(|(item_name, item)| match item {
245 AssocItemId::FunctionId(t) if item_name == name => Some(*t),
250 pub fn attribute_calls(&self) -> impl Iterator<Item = (AstId<ast::Item>, MacroCallId)> + '_ {
251 self.attribute_calls.iter().flat_map(|it| it.iter()).copied()
255 #[derive(Debug, Clone, PartialEq, Eq)]
256 pub struct ImplData {
257 pub target_trait: Option<Interned<TraitRef>>,
258 pub self_ty: Interned<TypeRef>,
259 pub items: Vec<AssocItemId>,
260 pub is_negative: bool,
261 // box it as the vec is usually empty anyways
262 pub attribute_calls: Option<Box<Vec<(AstId<ast::Item>, MacroCallId)>>>,
266 pub(crate) fn impl_data_query(db: &dyn DefDatabase, id: ImplId) -> Arc<ImplData> {
267 let _p = profile::span("impl_data_query");
268 let impl_loc = id.lookup(db);
270 let item_tree = impl_loc.id.item_tree(db);
271 let impl_def = &item_tree[impl_loc.id.value];
272 let target_trait = impl_def.target_trait.clone();
273 let self_ty = impl_def.self_ty.clone();
274 let is_negative = impl_def.is_negative;
275 let module_id = impl_loc.container;
277 let mut collector = AssocItemCollector::new(
280 impl_loc.id.file_id(),
281 ItemContainerId::ImplId(id),
283 collector.collect(impl_loc.id.tree_id(), &impl_def.items);
285 let attribute_calls = collector.take_attr_calls();
286 let items = collector.items.into_iter().map(|(_, item)| item).collect();
288 Arc::new(ImplData { target_trait, self_ty, items, is_negative, attribute_calls })
291 pub fn attribute_calls(&self) -> impl Iterator<Item = (AstId<ast::Item>, MacroCallId)> + '_ {
292 self.attribute_calls.iter().flat_map(|it| it.iter()).copied()
296 #[derive(Debug, Clone, PartialEq, Eq)]
297 pub struct ConstData {
298 /// `None` for `const _: () = ();`
299 pub name: Option<Name>,
300 pub type_ref: Interned<TypeRef>,
301 pub visibility: RawVisibility,
305 pub(crate) fn const_data_query(db: &dyn DefDatabase, konst: ConstId) -> Arc<ConstData> {
306 let loc = konst.lookup(db);
307 let item_tree = loc.id.item_tree(db);
308 let konst = &item_tree[loc.id.value];
311 name: konst.name.clone(),
312 type_ref: konst.type_ref.clone(),
313 visibility: item_tree[konst.visibility].clone(),
318 #[derive(Debug, Clone, PartialEq, Eq)]
319 pub struct StaticData {
321 pub type_ref: Interned<TypeRef>,
322 pub visibility: RawVisibility,
328 pub(crate) fn static_data_query(db: &dyn DefDatabase, konst: StaticId) -> Arc<StaticData> {
329 let loc = konst.lookup(db);
330 let item_tree = loc.id.item_tree(db);
331 let statik = &item_tree[loc.id.value];
333 Arc::new(StaticData {
334 name: statik.name.clone(),
335 type_ref: statik.type_ref.clone(),
336 visibility: item_tree[statik.visibility].clone(),
337 mutable: statik.mutable,
338 is_extern: matches!(loc.container, ItemContainerId::ExternBlockId(_)),
343 struct AssocItemCollector<'a> {
344 db: &'a dyn DefDatabase,
346 def_map: Arc<DefMap>,
347 container: ItemContainerId,
350 items: Vec<(Name, AssocItemId)>,
351 attr_calls: Vec<(AstId<ast::Item>, MacroCallId)>,
354 impl<'a> AssocItemCollector<'a> {
356 db: &'a dyn DefDatabase,
359 container: ItemContainerId,
364 def_map: module_id.def_map(db),
366 expander: Expander::new(db, file_id, module_id),
369 attr_calls: Vec::new(),
373 fn take_attr_calls(&mut self) -> Option<Box<Vec<(AstId<ast::Item>, MacroCallId)>>> {
374 let attribute_calls = mem::take(&mut self.attr_calls);
375 if attribute_calls.is_empty() {
378 Some(Box::new(attribute_calls))
382 fn collect(&mut self, tree_id: TreeId, assoc_items: &[AssocItem]) {
383 let item_tree = tree_id.item_tree(self.db);
385 'items: for &item in assoc_items {
386 let attrs = item_tree.attrs(self.db, self.module_id.krate, ModItem::from(item).into());
387 if !attrs.is_cfg_enabled(self.expander.cfg_options()) {
391 for attr in &*attrs {
393 AstId::new(self.expander.current_file_id(), item.ast_id(&item_tree).upcast());
394 let ast_id_with_path = AstIdWithPath { path: (*attr.path).clone(), ast_id };
396 if let Ok(ResolvedAttr::Macro(call_id)) = self.def_map.resolve_attr_macro(
398 self.module_id.local_id,
402 self.attr_calls.push((ast_id, call_id));
403 let res = self.expander.enter_expand_id(self.db, call_id);
404 self.collect_macro_items(res);
410 AssocItem::Function(id) => {
411 let item = &item_tree[id];
413 FunctionLoc { container: self.container, id: ItemTreeId::new(tree_id, id) }
415 self.items.push((item.name.clone(), def.into()));
417 AssocItem::Const(id) => {
418 let item = &item_tree[id];
419 let name = match item.name.clone() {
424 ConstLoc { container: self.container, id: ItemTreeId::new(tree_id, id) }
426 self.items.push((name, def.into()));
428 AssocItem::TypeAlias(id) => {
429 let item = &item_tree[id];
430 let def = TypeAliasLoc {
431 container: self.container,
432 id: ItemTreeId::new(tree_id, id),
435 self.items.push((item.name.clone(), def.into()));
437 AssocItem::MacroCall(call) => {
438 let call = &item_tree[call];
439 let ast_id_map = self.db.ast_id_map(self.expander.current_file_id());
440 let root = self.db.parse_or_expand(self.expander.current_file_id()).unwrap();
441 let call = ast_id_map.get(call.ast_id).to_node(&root);
443 stdx::panic_context::enter(format!("collect_items MacroCall: {}", call));
444 let res = self.expander.enter_expand(self.db, call);
446 if let Ok(res) = res {
447 self.collect_macro_items(res);
454 fn collect_macro_items(&mut self, res: ExpandResult<Option<(Mark, ast::MacroItems)>>) {
455 if let Some((mark, mac)) = res.value {
456 let src: InFile<ast::MacroItems> = self.expander.to_source(mac);
457 let tree_id = item_tree::TreeId::new(src.file_id, None);
458 let item_tree = tree_id.item_tree(self.db);
460 item_tree.top_level_items().iter().filter_map(ModItem::as_assoc_item).collect();
462 self.collect(tree_id, &iter);
464 self.expander.exit(self.db, mark);