243 lines
8.6 KiB
Rust
243 lines
8.6 KiB
Rust
//! Defines hir-level representation of visibility (e.g. `pub` and `pub(crate)`).
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use std::{iter, sync::Arc};
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use hir_expand::{hygiene::Hygiene, InFile};
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use la_arena::ArenaMap;
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use syntax::ast;
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use crate::{
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db::DefDatabase,
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nameres::DefMap,
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path::{ModPath, PathKind},
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resolver::HasResolver,
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ConstId, FunctionId, HasModule, LocalFieldId, ModuleId, VariantId,
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};
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/// Visibility of an item, not yet resolved.
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum RawVisibility {
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/// `pub(in module)`, `pub(crate)` or `pub(super)`. Also private, which is
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/// equivalent to `pub(self)`.
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Module(ModPath),
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/// `pub`.
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Public,
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}
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impl RawVisibility {
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pub(crate) const fn private() -> RawVisibility {
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RawVisibility::Module(ModPath::from_kind(PathKind::Super(0)))
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}
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pub(crate) fn from_ast(
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db: &dyn DefDatabase,
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node: InFile<Option<ast::Visibility>>,
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) -> RawVisibility {
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Self::from_ast_with_hygiene(db, node.value, &Hygiene::new(db.upcast(), node.file_id))
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}
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pub(crate) fn from_ast_with_hygiene(
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db: &dyn DefDatabase,
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node: Option<ast::Visibility>,
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hygiene: &Hygiene,
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) -> RawVisibility {
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Self::from_ast_with_hygiene_and_default(db, node, RawVisibility::private(), hygiene)
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}
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pub(crate) fn from_ast_with_hygiene_and_default(
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db: &dyn DefDatabase,
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node: Option<ast::Visibility>,
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default: RawVisibility,
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hygiene: &Hygiene,
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) -> RawVisibility {
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let node = match node {
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None => return default,
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Some(node) => node,
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};
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match node.kind() {
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ast::VisibilityKind::In(path) => {
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let path = ModPath::from_src(db.upcast(), path, hygiene);
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let path = match path {
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None => return RawVisibility::private(),
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Some(path) => path,
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};
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RawVisibility::Module(path)
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}
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ast::VisibilityKind::PubCrate => {
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let path = ModPath::from_kind(PathKind::Crate);
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RawVisibility::Module(path)
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}
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ast::VisibilityKind::PubSuper => {
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let path = ModPath::from_kind(PathKind::Super(1));
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RawVisibility::Module(path)
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}
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ast::VisibilityKind::PubSelf => {
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let path = ModPath::from_kind(PathKind::Plain);
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RawVisibility::Module(path)
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}
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ast::VisibilityKind::Pub => RawVisibility::Public,
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}
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}
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pub fn resolve(
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&self,
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db: &dyn DefDatabase,
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resolver: &crate::resolver::Resolver,
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) -> Visibility {
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// we fall back to public visibility (i.e. fail open) if the path can't be resolved
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resolver.resolve_visibility(db, self).unwrap_or(Visibility::Public)
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}
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}
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/// Visibility of an item, with the path resolved.
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub enum Visibility {
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/// Visibility is restricted to a certain module.
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Module(ModuleId),
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/// Visibility is unrestricted.
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Public,
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}
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impl Visibility {
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pub fn is_visible_from(self, db: &dyn DefDatabase, from_module: ModuleId) -> bool {
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let to_module = match self {
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Visibility::Module(m) => m,
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Visibility::Public => return true,
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};
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// if they're not in the same crate, it can't be visible
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if from_module.krate != to_module.krate {
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return false;
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}
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let def_map = from_module.def_map(db);
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self.is_visible_from_def_map(db, &def_map, from_module.local_id)
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}
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pub(crate) fn is_visible_from_other_crate(self) -> bool {
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matches!(self, Visibility::Public)
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}
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pub(crate) fn is_visible_from_def_map(
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self,
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db: &dyn DefDatabase,
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def_map: &DefMap,
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mut from_module: crate::LocalModuleId,
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) -> bool {
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let mut to_module = match self {
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Visibility::Module(m) => m,
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Visibility::Public => return true,
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};
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// `to_module` might be the root module of a block expression. Those have the same
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// visibility as the containing module (even though no items are directly nameable from
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// there, getting this right is important for method resolution).
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// In that case, we adjust the visibility of `to_module` to point to the containing module.
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// Additional complication: `to_module` might be in `from_module`'s `DefMap`, which we're
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// currently computing, so we must not call the `def_map` query for it.
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let arc;
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let to_module_def_map =
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if to_module.krate == def_map.krate() && to_module.block == def_map.block_id() {
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cov_mark::hit!(is_visible_from_same_block_def_map);
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def_map
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} else {
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arc = to_module.def_map(db);
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&arc
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};
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let is_block_root = matches!(to_module.block, Some(_) if to_module_def_map[to_module.local_id].parent.is_none());
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if is_block_root {
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to_module = to_module_def_map.containing_module(to_module.local_id).unwrap();
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}
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// from_module needs to be a descendant of to_module
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let mut def_map = def_map;
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let mut parent_arc;
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loop {
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if def_map.module_id(from_module) == to_module {
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return true;
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}
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match def_map[from_module].parent {
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Some(parent) => from_module = parent,
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None => {
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match def_map.parent() {
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Some(module) => {
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parent_arc = module.def_map(db);
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def_map = &*parent_arc;
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from_module = module.local_id;
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}
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// Reached the root module, nothing left to check.
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None => return false,
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}
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}
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}
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}
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}
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/// Returns the most permissive visibility of `self` and `other`.
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///
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/// If there is no subset relation between `self` and `other`, returns `None` (ie. they're only
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/// visible in unrelated modules).
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pub(crate) fn max(self, other: Visibility, def_map: &DefMap) -> Option<Visibility> {
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match (self, other) {
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(Visibility::Module(_) | Visibility::Public, Visibility::Public)
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| (Visibility::Public, Visibility::Module(_)) => Some(Visibility::Public),
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(Visibility::Module(mod_a), Visibility::Module(mod_b)) => {
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if mod_a.krate != mod_b.krate {
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return None;
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}
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let mut a_ancestors = iter::successors(Some(mod_a.local_id), |&m| {
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let parent_id = def_map[m].parent?;
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Some(parent_id)
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});
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let mut b_ancestors = iter::successors(Some(mod_b.local_id), |&m| {
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let parent_id = def_map[m].parent?;
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Some(parent_id)
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});
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if a_ancestors.any(|m| m == mod_b.local_id) {
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// B is above A
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return Some(Visibility::Module(mod_b));
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}
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if b_ancestors.any(|m| m == mod_a.local_id) {
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// A is above B
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return Some(Visibility::Module(mod_a));
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}
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None
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}
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}
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}
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}
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/// Resolve visibility of all specific fields of a struct or union variant.
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pub(crate) fn field_visibilities_query(
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db: &dyn DefDatabase,
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variant_id: VariantId,
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) -> Arc<ArenaMap<LocalFieldId, Visibility>> {
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let var_data = match variant_id {
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VariantId::StructId(it) => db.struct_data(it).variant_data.clone(),
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VariantId::UnionId(it) => db.union_data(it).variant_data.clone(),
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VariantId::EnumVariantId(it) => {
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db.enum_data(it.parent).variants[it.local_id].variant_data.clone()
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}
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};
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let resolver = variant_id.module(db).resolver(db);
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let mut res = ArenaMap::default();
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for (field_id, field_data) in var_data.fields().iter() {
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res.insert(field_id, field_data.visibility.resolve(db, &resolver));
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}
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Arc::new(res)
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}
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/// Resolve visibility of a function.
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pub(crate) fn function_visibility_query(db: &dyn DefDatabase, def: FunctionId) -> Visibility {
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let resolver = def.resolver(db);
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db.function_data(def).visibility.resolve(db, &resolver)
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}
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/// Resolve visibility of a const.
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pub(crate) fn const_visibility_query(db: &dyn DefDatabase, def: ConstId) -> Visibility {
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let resolver = def.resolver(db);
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db.const_data(def).visibility.resolve(db, &resolver)
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}
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