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handle #[cfg]s on generic parameters

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This commit is contained in:
Max Heller 2023-07-27 21:17:10 -04:00
parent b64e5b3919
commit 008b639ef5
3 changed files with 65 additions and 4 deletions
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19
crates/hir-def/src/generics.rs
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@ -21,6 +21,7 @@ use crate::{
db::DefDatabase,
dyn_map::{keys, DynMap},
expander::Expander,
item_tree::ItemTree,
lower::LowerCtx,
nameres::{DefMap, MacroSubNs},
src::{HasChildSource, HasSource},
@ -154,12 +155,28 @@ impl GenericParams {
def: GenericDefId,
) -> Interned<GenericParams> {
let _p = profile::span("generic_params_query");
let krate = def.module(db).krate;
let cfg_options = db.crate_graph();
let cfg_options = &cfg_options[krate].cfg_options;
let enabled_params = |params: &GenericParams, item_tree: &ItemTree| {
let enabled = |param| item_tree.attrs(db, krate, param).is_cfg_enabled(cfg_options);
Interned::new(GenericParams {
type_or_consts: (params.type_or_consts.iter())
.filter_map(|(idx, param)| enabled(idx.into()).then(|| param.clone()))
.collect(),
lifetimes: (params.lifetimes.iter())
.filter_map(|(idx, param)| enabled(idx.into()).then(|| param.clone()))
.collect(),
where_predicates: params.where_predicates.clone(),
})
};
macro_rules! id_to_generics {
($id:ident) => {{
let id = $id.lookup(db).id;
let tree = id.item_tree(db);
let item = &tree[id.value];
item.generic_params.clone()
enabled_params(&item.generic_params, &tree)
}};
}