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Restructure add_item_to_search_index to eliminate code paths

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Many of the code paths it handled were actually impossible. In other
cases, the various checks and transformations were spread around in such
a way that it was hard to tell what was going on.
This commit is contained in:
Noah Lev 2024-08-02 14:48:36 -07:00
parent 08f4d54ea9
commit 220c2d8c9b
1 changed files with 102 additions and 109 deletions
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211
src/librustdoc/formats/cache.rs
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@ -442,7 +442,9 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
} }
fn add_item_to_search_index(tcx: TyCtxt<'_>, cache: &mut Cache, item: &clean::Item, name: Symbol) { fn add_item_to_search_index(tcx: TyCtxt<'_>, cache: &mut Cache, item: &clean::Item, name: Symbol) {
let ((parent_did, parent_path), is_impl_child) = match *item.kind { // Item has a name, so it must also have a DefId (can't be an impl, let alone a blanket or auto impl).
let item_def_id = item.item_id.as_def_id().unwrap();
let (parent_did, parent_path) = match *item.kind {
clean::StrippedItem(..) => return, clean::StrippedItem(..) => return,
clean::AssocConstItem(..) | clean::AssocTypeItem(..) clean::AssocConstItem(..) | clean::AssocTypeItem(..)
if cache.parent_stack.last().is_some_and(|parent| parent.is_trait_impl()) => if cache.parent_stack.last().is_some_and(|parent| parent.is_trait_impl()) =>
@ -454,123 +456,114 @@ fn add_item_to_search_index(tcx: TyCtxt<'_>, cache: &mut Cache, item: &clean::It
| clean::TyAssocConstItem(..) | clean::TyAssocConstItem(..)
| clean::TyAssocTypeItem(..) | clean::TyAssocTypeItem(..)
| clean::StructFieldItem(..) | clean::StructFieldItem(..)
| clean::VariantItem(..) => ( | clean::VariantItem(..) => {
( // Don't index if containing module is stripped (i.e., private),
Some( // or if item is tuple struct/variant field (name is a number -> not useful for search).
cache if cache.stripped_mod
.parent_stack || item.type_() == ItemType::StructField
.last() && name.as_str().chars().all(|c| c.is_digit(10))
.expect("parent_stack is empty") {
.item_id() return;
.expect_def_id(), }
), let parent_did =
Some(&cache.stack[..cache.stack.len() - 1]), cache.parent_stack.last().expect("parent_stack is empty").item_id().expect_def_id();
), let parent_path = &cache.stack[..cache.stack.len() - 1];
false, (Some(parent_did), parent_path)
), }
clean::MethodItem(..) | clean::AssocConstItem(..) | clean::AssocTypeItem(..) => { clean::MethodItem(..) | clean::AssocConstItem(..) | clean::AssocTypeItem(..) => {
let last = cache.parent_stack.last().expect("parent_stack is empty 2"); let last = cache.parent_stack.last().expect("parent_stack is empty 2");
let did = match &*last { let parent_did = match &*last {
ParentStackItem::Impl { // impl Trait for &T { fn method(self); }
// impl Trait for &T { fn method(self); } //
// // When generating a function index with the above shape, we want it
// When generating a function index with the above shape, we want it // associated with `T`, not with the primitive reference type. It should
// associated with `T`, not with the primitive reference type. It should // show up as `T::method`, rather than `reference::method`, in the search
// show up as `T::method`, rather than `reference::method`, in the search // results page.
// results page. ParentStackItem::Impl { for_: clean::Type::BorrowedRef { type_, .. }, .. } => {
for_: clean::Type::BorrowedRef { type_, .. }, type_.def_id(&cache)
.. }
} => type_.def_id(&cache),
ParentStackItem::Impl { for_, .. } => for_.def_id(&cache), ParentStackItem::Impl { for_, .. } => for_.def_id(&cache),
ParentStackItem::Type(item_id) => item_id.as_def_id(), ParentStackItem::Type(item_id) => item_id.as_def_id(),
}; };
let path = did let Some(parent_did) = parent_did else { return };
.and_then(|did| cache.paths.get(&did)) // The current stack not necessarily has correlation
// The current stack not necessarily has correlation // for where the type was defined. On the other
// for where the type was defined. On the other // hand, `paths` always has the right
// hand, `paths` always has the right // information if present.
// information if present. match cache.paths.get(&parent_did) {
.map(|(fqp, _)| &fqp[..fqp.len() - 1]); Some((fqp, _)) => (Some(parent_did), &fqp[..fqp.len() - 1]),
((did, path), true) None => {
handle_orphan_impl_child(cache, item, parent_did);
return;
}
}
}
_ => {
// Don't index if item is crate root, which is inserted later on when serializing the index.
if item_def_id.is_crate_root() {
return;
}
(None, &*cache.stack)
} }
_ => ((None, Some(&*cache.stack)), false),
}; };
if let Some(parent_did) = parent_did debug_assert!(!item.is_stripped());
&& parent_path.is_none()
&& is_impl_child
{
// We have a parent, but we don't know where they're
// defined yet. Wait for later to index this item.
let impl_generics = clean_impl_generics(cache.parent_stack.last());
let impl_id = if let Some(ParentStackItem::Impl { item_id, .. }) = cache.parent_stack.last()
{
item_id.as_def_id()
} else {
None
};
let orphan_item =
OrphanImplItem { parent: parent_did, item: item.clone(), impl_generics, impl_id };
cache.orphan_impl_items.push(orphan_item);
} else if let Some(path) = parent_path
&& (is_impl_child || !cache.stripped_mod)
{
debug_assert!(!item.is_stripped());
// A crate has a module at its root, containing all items, let desc = short_markdown_summary(&item.doc_value(), &item.link_names(cache));
// which should not be indexed. The crate-item itself is // For searching purposes, a re-export is a duplicate if:
// inserted later on when serializing the search-index. //
if item.item_id.as_def_id().is_some_and(|idx| !idx.is_crate_root()) // - It's either an inline, or a true re-export
&& let ty = item.type_() // - It's got the same name
&& (ty != ItemType::StructField || u16::from_str_radix(name.as_str(), 10).is_err()) // - Both of them have the same exact path
{ let defid = match &*item.kind {
let desc = short_markdown_summary(&item.doc_value(), &item.link_names(cache)); clean::ItemKind::ImportItem(import) => import.source.did.unwrap_or(item_def_id),
// For searching purposes, a re-export is a duplicate if: _ => item_def_id,
// };
// - It's either an inline, or a true re-export let path = join_with_double_colon(parent_path);
// - It's got the same name let impl_id = if let Some(ParentStackItem::Impl { item_id, .. }) = cache.parent_stack.last() {
// - Both of them have the same exact path item_id.as_def_id()
let defid = (match &*item.kind { } else {
&clean::ItemKind::ImportItem(ref import) => import.source.did, None
_ => None, };
}) let search_type = get_function_type_for_search(
.or_else(|| item.item_id.as_def_id()); &item,
// In case this is a field from a tuple struct, we don't add it into tcx,
// the search index because its name is something like "0", which is clean_impl_generics(cache.parent_stack.last()).as_ref(),
// not useful for rustdoc search. parent_did,
let path = join_with_double_colon(path); cache,
let impl_id = );
if let Some(ParentStackItem::Impl { item_id, .. }) = cache.parent_stack.last() { let aliases = item.attrs.get_doc_aliases();
item_id.as_def_id() let deprecation = item.deprecation(tcx);
} else { let index_item = IndexItem {
None ty: item.type_(),
}; defid: Some(defid),
let search_type = get_function_type_for_search( name,
&item, path,
tcx, desc,
clean_impl_generics(cache.parent_stack.last()).as_ref(), parent: parent_did,
parent_did, parent_idx: None,
cache, exact_path: None,
); impl_id,
let aliases = item.attrs.get_doc_aliases(); search_type,
let deprecation = item.deprecation(tcx); aliases,
let index_item = IndexItem { deprecation,
ty, };
defid, cache.search_index.push(index_item);
name, }
path,
desc, /// We have a parent, but we don't know where they're
parent: parent_did, /// defined yet. Wait for later to index this item.
parent_idx: None, /// See [`Cache::orphan_impl_items`].
exact_path: None, fn handle_orphan_impl_child(cache: &mut Cache, item: &clean::Item, parent_did: DefId) {
impl_id, let impl_generics = clean_impl_generics(cache.parent_stack.last());
search_type, let impl_id = if let Some(ParentStackItem::Impl { item_id, .. }) = cache.parent_stack.last() {
aliases, item_id.as_def_id()
deprecation, } else {
}; None
cache.search_index.push(index_item); };
} let orphan_item =
} OrphanImplItem { parent: parent_did, item: item.clone(), impl_generics, impl_id };
cache.orphan_impl_items.push(orphan_item);
} }
pub(crate) struct OrphanImplItem { pub(crate) struct OrphanImplItem {