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rustdoc: rewrite stability inheritance as a pass

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This commit is contained in:
Lukas Markeffsky 2024-09-30 01:20:17 +00:00
parent 19252bde65
commit cd31b3acb3
9 changed files with 149 additions and 68 deletions
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1
src/librustdoc/clean/auto_trait.rs
View File

@ -117,6 +117,7 @@ fn synthesize_auto_trait_impl<'tcx>(
name: None,
inner: Box::new(clean::ItemInner {
attrs: Default::default(),
stability: None,
kind: clean::ImplItem(Box::new(clean::Impl {
safety: hir::Safety::Safe,
generics,

1
src/librustdoc/clean/blanket_impl.rs
View File

@ -87,6 +87,7 @@ pub(crate) fn synthesize_blanket_impls(
item_id: clean::ItemId::Blanket { impl_id: impl_def_id, for_: item_def_id },
inner: Box::new(clean::ItemInner {
attrs: Default::default(),
stability: None,
kind: clean::ImplItem(Box::new(clean::Impl {
safety: hir::Safety::Safe,
generics: clean_ty_generics(

1
src/librustdoc/clean/inline.rs
View File

@ -672,6 +672,7 @@ fn build_module_items(
item_id: ItemId::DefId(did),
inner: Box::new(clean::ItemInner {
attrs: Default::default(),
stability: None,
kind: clean::ImportItem(clean::Import::new_simple(
item.ident.name,
clean::ImportSource {

55
src/librustdoc/clean/types.rs
View File

@ -6,7 +6,7 @@ use std::{fmt, iter};
use arrayvec::ArrayVec;
use rustc_ast_pretty::pprust;
use rustc_attr::{ConstStability, Deprecation, Stability, StabilityLevel, StableSince};
use rustc_attr::{ConstStability, Deprecation, Stability, StableSince};
use rustc_const_eval::const_eval::is_unstable_const_fn;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_hir::def::{CtorKind, DefKind, Res};
@ -333,6 +333,8 @@ pub(crate) struct ItemInner {
/// E.g., struct vs enum vs function.
pub(crate) kind: ItemKind,
pub(crate) attrs: Attributes,
/// The effective stability, filled out by the `propagate-stability` pass.
pub(crate) stability: Option<Stability>,
}
impl std::ops::Deref for Item {
@ -381,46 +383,17 @@ fn is_field_vis_inherited(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
}
impl Item {
/// Returns the effective stability of the item.
///
/// This method should only be called after the `propagate-stability` pass has been run.
pub(crate) fn stability(&self, tcx: TyCtxt<'_>) -> Option<Stability> {
let (mut def_id, mut stability) = if let Some(inlined) = self.inline_stmt_id {
let inlined_def_id = inlined.to_def_id();
if let Some(stability) = tcx.lookup_stability(inlined_def_id) {
(inlined_def_id, stability)
} else {
// For re-exports into crates without `staged_api`, reuse the original stability.
// This is necessary, because we always want to mark unstable items.
let def_id = self.def_id()?;
return tcx.lookup_stability(def_id);
}
} else {
let def_id = self.def_id()?;
let stability = tcx.lookup_stability(def_id)?;
(def_id, stability)
};
let StabilityLevel::Stable { mut since, allowed_through_unstable_modules: false } =
stability.level
else {
return Some(stability);
};
// If any of the item's ancestors was stabilized later or is still unstable,
// then report the ancestor's stability instead.
while let Some(parent_def_id) = tcx.opt_parent(def_id) {
if let Some(parent_stability) = tcx.lookup_stability(parent_def_id) {
match parent_stability.level {
StabilityLevel::Unstable { .. } => return Some(parent_stability),
StabilityLevel::Stable { since: parent_since, .. } => {
if parent_since > since {
stability = parent_stability;
since = parent_since;
}
}
}
}
def_id = parent_def_id;
}
Some(stability)
let stability = self.inner.stability;
debug_assert!(
stability.is_some()
|| self.def_id().is_none_or(|did| tcx.lookup_stability(did).is_none()),
"missing stability for cleaned item: {self:?}",
);
stability
}
pub(crate) fn const_stability(&self, tcx: TyCtxt<'_>) -> Option<ConstStability> {
@ -502,7 +475,7 @@ impl Item {
Item {
item_id: def_id.into(),
inner: Box::new(ItemInner { kind, attrs }),
inner: Box::new(ItemInner { kind, attrs, stability: None }),
name,
cfg,
inline_stmt_id: None,

31
src/librustdoc/html/render/print_item.rs
View File

@ -436,16 +436,9 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
}
clean::ImportItem(ref import) => {
let stab_tags = if let Some(import_def_id) = import.source.did {
// Just need an item with the correct def_id and attrs
let import_item =
clean::Item { item_id: import_def_id.into(), ..(*myitem).clone() };
let stab_tags = Some(extra_info_tags(&import_item, item, tcx).to_string());
stab_tags
} else {
None
};
let stab_tags = import.source.did.map_or_else(String::new, |import_def_id| {
extra_info_tags(tcx, myitem, item, Some(import_def_id)).to_string()
});
w.write_str(ITEM_TABLE_ROW_OPEN);
let id = match import.kind {
@ -454,7 +447,6 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
}
clean::ImportKind::Glob => String::new(),
};
let stab_tags = stab_tags.unwrap_or_default();
let (stab_tags_before, stab_tags_after) = if stab_tags.is_empty() {
("", "")
} else {
@ -521,7 +513,7 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
{docs_before}{docs}{docs_after}",
name = EscapeBodyTextWithWbr(myitem.name.unwrap().as_str()),
visibility_and_hidden = visibility_and_hidden,
stab_tags = extra_info_tags(myitem, item, tcx),
stab_tags = extra_info_tags(tcx, myitem, item, None),
class = myitem.type_(),
unsafety_flag = unsafety_flag,
href = item_path(myitem.type_(), myitem.name.unwrap().as_str()),
@ -544,9 +536,10 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
/// Render the stability, deprecation and portability tags that are displayed in the item's summary
/// at the module level.
fn extra_info_tags<'a, 'tcx: 'a>(
tcx: TyCtxt<'tcx>,
item: &'a clean::Item,
parent: &'a clean::Item,
tcx: TyCtxt<'tcx>,
import_def_id: Option<DefId>,
) -> impl fmt::Display + 'a + Captures<'tcx> {
display_fn(move |f| {
fn tag_html<'a>(
@ -564,18 +557,18 @@ fn extra_info_tags<'a, 'tcx: 'a>(
}
// The trailing space after each tag is to space it properly against the rest of the docs.
if let Some(depr) = &item.deprecation(tcx) {
let deprecation = import_def_id
.map_or_else(|| item.deprecation(tcx), |import_did| tcx.lookup_deprecation(import_did));
if let Some(depr) = deprecation {
let message = if depr.is_in_effect() { "Deprecated" } else { "Deprecation planned" };
write!(f, "{}", tag_html("deprecated", "", message))?;
}
// The "rustc_private" crates are permanently unstable so it makes no sense
// to render "unstable" everywhere.
if item
.stability(tcx)
.as_ref()
.is_some_and(|s| s.is_unstable() && s.feature != sym::rustc_private)
{
let stability = import_def_id
.map_or_else(|| item.stability(tcx), |import_did| tcx.lookup_stability(import_did));
if stability.is_some_and(|s| s.is_unstable() && s.feature != sym::rustc_private) {
write!(f, "{}", tag_html("unstable", "", "Experimental"))?;
}

5
src/librustdoc/passes/mod.rs
View File

@ -23,6 +23,9 @@ pub(crate) use self::strip_priv_imports::STRIP_PRIV_IMPORTS;
mod propagate_doc_cfg;
pub(crate) use self::propagate_doc_cfg::PROPAGATE_DOC_CFG;
mod propagate_stability;
pub(crate) use self::propagate_stability::PROPAGATE_STABILITY;
pub(crate) mod collect_intra_doc_links;
pub(crate) use self::collect_intra_doc_links::COLLECT_INTRA_DOC_LINKS;
@ -75,6 +78,7 @@ pub(crate) const PASSES: &[Pass] = &[
STRIP_PRIVATE,
STRIP_PRIV_IMPORTS,
PROPAGATE_DOC_CFG,
PROPAGATE_STABILITY,
COLLECT_INTRA_DOC_LINKS,
COLLECT_TRAIT_IMPLS,
CALCULATE_DOC_COVERAGE,
@ -91,6 +95,7 @@ pub(crate) const DEFAULT_PASSES: &[ConditionalPass] = &[
ConditionalPass::new(STRIP_PRIV_IMPORTS, WhenDocumentPrivate),
ConditionalPass::always(COLLECT_INTRA_DOC_LINKS),
ConditionalPass::always(PROPAGATE_DOC_CFG),
ConditionalPass::always(PROPAGATE_STABILITY),
ConditionalPass::always(RUN_LINTS),
];

72
src/librustdoc/passes/propagate_stability.rs Normal file
View File

@ -0,0 +1,72 @@
//! Propagates stability to child items.
//!
//! The purpose of this pass is to make items whose parents are "more unstable"
//! than the item itself inherit the parent's stability.
//! For example, [`core::error::Error`] is marked as stable since 1.0.0, but the
//! [`core::error`] module is marked as stable since 1.81.0, so we want to show
//! [`core::error::Error`] as stable since 1.81.0 as well.
use rustc_attr::{Stability, StabilityLevel};
use rustc_hir::def_id::CRATE_DEF_ID;
use crate::clean::{Crate, Item, ItemId};
use crate::core::DocContext;
use crate::fold::DocFolder;
use crate::passes::Pass;
pub(crate) const PROPAGATE_STABILITY: Pass = Pass {
name: "propagate-stability",
run: propagate_stability,
description: "propagates stability to child items",
};
pub(crate) fn propagate_stability(cr: Crate, cx: &mut DocContext<'_>) -> Crate {
let crate_stability = cx.tcx.lookup_stability(CRATE_DEF_ID);
StabilityPropagator { parent_stability: crate_stability, cx }.fold_crate(cr)
}
struct StabilityPropagator<'a, 'tcx> {
parent_stability: Option<Stability>,
cx: &'a mut DocContext<'tcx>,
}
impl<'a, 'tcx> DocFolder for StabilityPropagator<'a, 'tcx> {
fn fold_item(&mut self, mut item: Item) -> Option<Item> {
let parent_stability = self.parent_stability;
let stability = match item.item_id {
ItemId::DefId(def_id) => {
let own_stability = self.cx.tcx.lookup_stability(def_id);
// If any of the item's parents was stabilized later or is still unstable,
// then use the parent's stability instead.
if let Some(own_stab) = own_stability
&& let StabilityLevel::Stable {
since: own_since,
allowed_through_unstable_modules: false,
} = own_stab.level
&& let Some(parent_stab) = parent_stability
&& (parent_stab.is_unstable()
|| parent_stab
.stable_since()
.is_some_and(|parent_since| parent_since > own_since))
{
parent_stability
} else {
own_stability
}
}
ItemId::Auto { .. } | ItemId::Blanket { .. } => {
// For now, we do now show stability for synthesized impls.
None
}
};
item.inner.stability = stability;
self.parent_stability = stability;
let item = self.fold_item_recur(item);
self.parent_stability = parent_stability;
Some(item)
}
}

2
tests/rustdoc-ui/issues/issue-91713.stdout
View File

@ -5,6 +5,7 @@ strip-aliased-non-local - strips all non-local private aliased items from the ou
strip-private - strips all private items from a crate which cannot be seen externally, implies strip-priv-imports
strip-priv-imports - strips all private import statements (`use`, `extern crate`) from a crate
propagate-doc-cfg - propagates `#[doc(cfg(...))]` to child items
propagate-stability - propagates stability to child items
collect-intra-doc-links - resolves intra-doc links
collect-trait-impls - retrieves trait impls for items in the crate
calculate-doc-coverage - counts the number of items with and without documentation
@ -19,6 +20,7 @@ strip-aliased-non-local
strip-priv-imports (when --document-private-items)
collect-intra-doc-links
propagate-doc-cfg
propagate-stability
run-lints
Passes run with `--show-coverage`:

49
tests/rustdoc/stability.rs
View File

@ -25,28 +25,61 @@ pub struct ZzStable;
#[unstable(feature = "unstable", issue = "none")]
pub mod unstable {
//@ !hasraw stability/unstable/struct.Foo.html '//span[@class="since"]'
//@ !hasraw stability/unstable/struct.StableInUnstable.html \
// '//span[@class="since"]'
//@ has - '//div[@class="stab unstable"]' 'experimental'
#[stable(feature = "rust1", since = "1.0.0")]
pub struct Foo;
pub struct StableInUnstable;
#[stable(feature = "rust1", since = "1.0.0")]
pub mod stable_in_unstable {
//@ !hasraw stability/unstable/stable_in_unstable/struct.Inner.html \
// '//span[@class="since"]'
//@ has - '//div[@class="stab unstable"]' 'experimental'
#[stable(feature = "rust1", since = "1.0.0")]
pub struct Inner;
}
}
#[stable(feature = "rust2", since = "2.2.2")]
pub mod stable_later {
//@ has stability/stable_later/struct.Bar.html '//span[@class="since"]' '2.2.2'
//@ has stability/stable_later/struct.StableInLater.html \
// '//span[@class="since"]' '2.2.2'
#[stable(feature = "rust1", since = "1.0.0")]
pub struct Bar;
pub struct StableInLater;
#[stable(feature = "rust1", since = "1.0.0")]
pub mod stable_in_later {
//@ has stability/stable_later/stable_in_later/struct.Inner.html \
// '//span[@class="since"]' '2.2.2'
#[stable(feature = "rust1", since = "1.0.0")]
pub struct Inner;
}
}
#[stable(feature = "rust1", since = "1.0.0")]
pub mod stable_earlier {
//@ has stability/stable_earlier/struct.Foo.html '//span[@class="since"]' '1.0.0'
//@ has stability/stable_earlier/struct.StableInUnstable.html \
// '//span[@class="since"]' '1.0.0'
#[doc(inline)]
#[stable(feature = "rust1", since = "1.0.0")]
pub use crate::unstable::Foo;
pub use crate::unstable::StableInUnstable;
//@ has stability/stable_earlier/struct.Bar.html '//span[@class="since"]' '1.0.0'
//@ has stability/stable_earlier/stable_in_unstable/struct.Inner.html \
// '//span[@class="since"]' '1.0.0'
#[doc(inline)]
#[stable(feature = "rust1", since = "1.0.0")]
pub use crate::stable_later::Bar;
pub use crate::unstable::stable_in_unstable;
//@ has stability/stable_earlier/struct.StableInLater.html \
// '//span[@class="since"]' '1.0.0'
#[doc(inline)]
#[stable(feature = "rust1", since = "1.0.0")]
pub use crate::stable_later::StableInLater;
//@ has stability/stable_earlier/stable_in_later/struct.Inner.html \
// '//span[@class="since"]' '1.0.0'
#[doc(inline)]
#[stable(feature = "rust1", since = "1.0.0")]
pub use crate::stable_later::stable_in_later;
}