2 use rustc_data_structures
::fx
::{FxHashMap, FxHashSet}
;
3 use rustc_data_structures
::sync
::{self, Lrc}
;
4 use rustc_data_structures
::unord
::UnordSet
;
5 use rustc_errors
::emitter
::{Emitter, EmitterWriter}
;
6 use rustc_errors
::json
::JsonEmitter
;
7 use rustc_feature
::UnstableFeatures
;
8 use rustc_hir
::def
::{Namespace, Res}
;
9 use rustc_hir
::def_id
::{DefId, DefIdMap, LocalDefId}
;
10 use rustc_hir
::intravisit
::{self, Visitor}
;
11 use rustc_hir
::{HirId, Path, TraitCandidate}
;
12 use rustc_interface
::interface
;
13 use rustc_middle
::hir
::nested_filter
;
14 use rustc_middle
::ty
::{ParamEnv, Ty, TyCtxt}
;
15 use rustc_resolve
as resolve
;
16 use rustc_session
::config
::{self, CrateType, ErrorOutputType}
;
17 use rustc_session
::lint
;
18 use rustc_session
::Session
;
19 use rustc_span
::symbol
::sym
;
20 use rustc_span
::{source_map, Span, Symbol}
;
22 use std
::cell
::RefCell
;
25 use std
::sync
::LazyLock
;
27 use crate::clean
::inline
::build_external_trait
;
28 use crate::clean
::{self, ItemId}
;
29 use crate::config
::{Options as RustdocOptions, OutputFormat, RenderOptions}
;
30 use crate::formats
::cache
::Cache
;
31 use crate::passes
::collect_intra_doc_links
::PreprocessedMarkdownLink
;
32 use crate::passes
::{self, Condition::*}
;
34 pub(crate) use rustc_session
::config
::{Input, Options, UnstableOptions}
;
36 pub(crate) struct ResolverCaches
{
37 pub(crate) markdown_links
: Option
<FxHashMap
<String
, Vec
<PreprocessedMarkdownLink
>>>,
38 pub(crate) doc_link_resolutions
: FxHashMap
<(Symbol
, Namespace
, DefId
), Option
<Res
<NodeId
>>>,
39 /// Traits in scope for a given module.
40 /// See `collect_intra_doc_links::traits_implemented_by` for more details.
41 pub(crate) traits_in_scope
: DefIdMap
<Vec
<TraitCandidate
>>,
42 pub(crate) all_trait_impls
: Option
<Vec
<DefId
>>,
43 pub(crate) all_macro_rules
: FxHashMap
<Symbol
, Res
<NodeId
>>,
46 pub(crate) struct DocContext
<'tcx
> {
47 pub(crate) tcx
: TyCtxt
<'tcx
>,
48 /// Name resolver. Used for intra-doc links.
50 /// The `Rc<RefCell<...>>` wrapping is needed because that is what's returned by
51 /// [`rustc_interface::Queries::expansion()`].
52 // FIXME: see if we can get rid of this RefCell somehow
53 pub(crate) resolver
: Rc
<RefCell
<interface
::BoxedResolver
>>,
54 pub(crate) resolver_caches
: ResolverCaches
,
55 /// Used for normalization.
57 /// Most of this logic is copied from rustc_lint::late.
58 pub(crate) param_env
: ParamEnv
<'tcx
>,
59 /// Later on moved through `clean::Crate` into `cache`
60 pub(crate) external_traits
: Rc
<RefCell
<FxHashMap
<DefId
, clean
::Trait
>>>,
61 /// Used while populating `external_traits` to ensure we don't process the same trait twice at
63 pub(crate) active_extern_traits
: FxHashSet
<DefId
>,
64 // The current set of parameter substitutions,
65 // for expanding type aliases at the HIR level:
66 /// Table `DefId` of type, lifetime, or const parameter -> substituted type, lifetime, or const
67 pub(crate) substs
: FxHashMap
<DefId
, clean
::SubstParam
>,
68 /// Table synthetic type parameter for `impl Trait` in argument position -> bounds
69 pub(crate) impl_trait_bounds
: FxHashMap
<ImplTraitParam
, Vec
<clean
::GenericBound
>>,
70 /// Auto-trait or blanket impls processed so far, as `(self_ty, trait_def_id)`.
71 // FIXME(eddyb) make this a `ty::TraitRef<'tcx>` set.
72 pub(crate) generated_synthetics
: FxHashSet
<(Ty
<'tcx
>, DefId
)>,
73 pub(crate) auto_traits
: Vec
<DefId
>,
74 /// The options given to rustdoc that could be relevant to a pass.
75 pub(crate) render_options
: RenderOptions
,
76 /// This same cache is used throughout rustdoc, including in [`crate::html::render`].
77 pub(crate) cache
: Cache
,
78 /// Used by [`clean::inline`] to tell if an item has already been inlined.
79 pub(crate) inlined
: FxHashSet
<ItemId
>,
80 /// Used by `calculate_doc_coverage`.
81 pub(crate) output_format
: OutputFormat
,
82 /// Used by `strip_private`.
83 pub(crate) show_coverage
: bool
,
86 impl<'tcx
> DocContext
<'tcx
> {
87 pub(crate) fn sess(&self) -> &'tcx Session
{
91 pub(crate) fn with_param_env
<T
, F
: FnOnce(&mut Self) -> T
>(
96 let old_param_env
= mem
::replace(&mut self.param_env
, self.tcx
.param_env(def_id
));
98 self.param_env
= old_param_env
;
102 pub(crate) fn enter_resolver
<F
, R
>(&self, f
: F
) -> R
104 F
: FnOnce(&mut resolve
::Resolver
<'_
>) -> R
,
106 self.resolver
.borrow_mut().access(f
)
109 /// Call the closure with the given parameters set as
110 /// the substitutions for a type alias' RHS.
111 pub(crate) fn enter_alias
<F
, R
>(
113 substs
: FxHashMap
<DefId
, clean
::SubstParam
>,
117 F
: FnOnce(&mut Self) -> R
,
119 let old_substs
= mem
::replace(&mut self.substs
, substs
);
121 self.substs
= old_substs
;
125 /// Like `hir().local_def_id_to_hir_id()`, but skips calling it on fake DefIds.
126 /// (This avoids a slice-index-out-of-bounds panic.)
127 pub(crate) fn as_local_hir_id(tcx
: TyCtxt
<'_
>, item_id
: ItemId
) -> Option
<HirId
> {
129 ItemId
::DefId(real_id
) => {
130 real_id
.as_local().map(|def_id
| tcx
.hir().local_def_id_to_hir_id(def_id
))
132 // FIXME: Can this be `Some` for `Auto` or `Blanket`?
137 pub(crate) fn with_all_trait_impls(&mut self, f
: impl FnOnce(&mut Self, &[DefId
])) {
138 let all_trait_impls
= self.resolver_caches
.all_trait_impls
.take();
139 f(self, all_trait_impls
.as_ref().expect("`all_trait_impls` are already borrowed"));
140 self.resolver_caches
.all_trait_impls
= all_trait_impls
;
144 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
146 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
147 /// will be created for the handler.
148 pub(crate) fn new_handler(
149 error_format
: ErrorOutputType
,
150 source_map
: Option
<Lrc
<source_map
::SourceMap
>>,
151 diagnostic_width
: Option
<usize>,
152 unstable_opts
: &UnstableOptions
,
153 ) -> rustc_errors
::Handler
{
154 let fallback_bundle
=
155 rustc_errors
::fallback_fluent_bundle(rustc_errors
::DEFAULT_LOCALE_RESOURCES
, false);
156 let emitter
: Box
<dyn Emitter
+ sync
::Send
> = match error_format
{
157 ErrorOutputType
::HumanReadable(kind
) => {
158 let (short
, color_config
) = kind
.unzip();
160 EmitterWriter
::stderr(
162 source_map
.map(|sm
| sm
as _
),
169 unstable_opts
.track_diagnostics
,
171 .ui_testing(unstable_opts
.ui_testing
),
174 ErrorOutputType
::Json { pretty, json_rendered }
=> {
175 let source_map
= source_map
.unwrap_or_else(|| {
176 Lrc
::new(source_map
::SourceMap
::new(source_map
::FilePathMapping
::empty()))
188 unstable_opts
.track_diagnostics
,
190 .ui_testing(unstable_opts
.ui_testing
),
195 rustc_errors
::Handler
::with_emitter_and_flags(
197 unstable_opts
.diagnostic_handler_flags(true),
201 /// Parse, resolve, and typecheck the given crate.
202 pub(crate) fn create_config(
221 scrape_examples_options
,
224 ) -> rustc_interface
::Config
{
225 // Add the doc cfg into the doc build.
226 cfgs
.push("doc".to_string());
228 let cpath
= Some(input
.clone());
229 let input
= Input
::File(input
);
231 // By default, rustdoc ignores all lints.
232 // Specifically unblock lints relevant to documentation or the lint machinery itself.
233 let mut lints_to_show
= vec
![
234 // it's unclear whether these should be part of rustdoc directly (#77364)
235 rustc_lint
::builtin
::MISSING_DOCS
.name
.to_string(),
236 rustc_lint
::builtin
::INVALID_DOC_ATTRIBUTES
.name
.to_string(),
237 // these are definitely not part of rustdoc, but we want to warn on them anyway.
238 rustc_lint
::builtin
::RENAMED_AND_REMOVED_LINTS
.name
.to_string(),
239 rustc_lint
::builtin
::UNKNOWN_LINTS
.name
.to_string(),
240 rustc_lint
::builtin
::UNEXPECTED_CFGS
.name
.to_string(),
241 // this lint is needed to support `#[expect]` attributes
242 rustc_lint
::builtin
::UNFULFILLED_LINT_EXPECTATIONS
.name
.to_string(),
244 lints_to_show
.extend(crate::lint
::RUSTDOC_LINTS
.iter().map(|lint
| lint
.name
.to_string()));
246 let (lint_opts
, lint_caps
) = crate::lint
::init_lints(lints_to_show
, lint_opts
, |lint
| {
247 Some((lint
.name_lower(), lint
::Allow
))
251 if proc_macro_crate { vec![CrateType::ProcMacro] }
else { vec![CrateType::Rlib] }
;
252 let test
= scrape_examples_options
.map(|opts
| opts
.scrape_tests
).unwrap_or(false);
253 // plays with error output here!
254 let sessopts
= config
::Options
{
262 target_triple
: target
,
263 unstable_features
: UnstableFeatures
::from_environment(crate_name
.as_deref()),
264 actually_rustdoc
: true,
277 crate_cfg
: interface
::parse_cfgspecs(cfgs
),
278 crate_check_cfg
: interface
::parse_check_cfg(check_cfgs
),
285 parse_sess_created
: None
,
286 register_lints
: Some(Box
::new(crate::lint
::register_lints
)),
287 override_queries
: Some(|_sess
, providers
, _external_providers
| {
288 // Most lints will require typechecking, so just don't run them.
289 providers
.lint_mod
= |_
, _
| {}
;
290 // Prevent `rustc_hir_analysis::check_crate` from calling `typeck` on all bodies.
291 providers
.typeck_item_bodies
= |_
, _
| {}
;
292 // hack so that `used_trait_imports` won't try to call typeck
293 providers
.used_trait_imports
= |_
, _
| {
294 static EMPTY_SET
: LazyLock
<UnordSet
<LocalDefId
>> = LazyLock
::new(UnordSet
::default);
297 // In case typeck does end up being called, don't ICE in case there were name resolution errors
298 providers
.typeck
= move |tcx
, def_id
| {
299 // Closures' tables come from their outermost function,
300 // as they are part of the same "inference environment".
301 // This avoids emitting errors for the parent twice (see similar code in `typeck_with_fallback`)
302 let typeck_root_def_id
= tcx
.typeck_root_def_id(def_id
.to_def_id()).expect_local();
303 if typeck_root_def_id
!= def_id
{
304 return tcx
.typeck(typeck_root_def_id
);
308 let body
= hir
.body(hir
.body_owned_by(def_id
));
309 debug
!("visiting body for {:?}", def_id
);
310 EmitIgnoredResolutionErrors
::new(tcx
).visit_body(body
);
311 (rustc_interface
::DEFAULT_QUERY_PROVIDERS
.typeck
)(tcx
, def_id
)
314 make_codegen_backend
: None
,
315 registry
: rustc_driver
::diagnostics_registry(),
319 pub(crate) fn run_global_ctxt(
321 resolver
: Rc
<RefCell
<interface
::BoxedResolver
>>,
322 resolver_caches
: ResolverCaches
,
324 render_options
: RenderOptions
,
325 output_format
: OutputFormat
,
326 ) -> (clean
::Crate
, RenderOptions
, Cache
) {
327 // Certain queries assume that some checks were run elsewhere
328 // (see https://github.com/rust-lang/rust/pull/73566#issuecomment-656954425),
329 // so type-check everything other than function bodies in this crate before running lints.
331 // NOTE: this does not call `tcx.analysis()` so that we won't
332 // typeck function bodies or run the default rustc lints.
333 // (see `override_queries` in the `config`)
335 // HACK(jynelson) this calls an _extremely_ limited subset of `typeck`
336 // and might break if queries change their assumptions in the future.
338 // NOTE: This is copy/pasted from typeck/lib.rs and should be kept in sync with those changes.
339 tcx
.sess
.time("item_types_checking", || {
340 tcx
.hir().for_each_module(|module
| tcx
.ensure().check_mod_item_types(module
))
342 tcx
.sess
.abort_if_errors();
343 tcx
.sess
.time("missing_docs", || {
344 rustc_lint
::check_crate(tcx
, rustc_lint
::builtin
::MissingDoc
::new
);
346 tcx
.sess
.time("check_mod_attrs", || {
347 tcx
.hir().for_each_module(|module
| tcx
.ensure().check_mod_attrs(module
))
349 rustc_passes
::stability
::check_unused_or_stable_features(tcx
);
352 tcx
.all_traits().filter(|&trait_def_id
| tcx
.trait_is_auto(trait_def_id
)).collect();
354 let mut ctxt
= DocContext
{
358 param_env
: ParamEnv
::empty(),
359 external_traits
: Default
::default(),
360 active_extern_traits
: Default
::default(),
361 substs
: Default
::default(),
362 impl_trait_bounds
: Default
::default(),
363 generated_synthetics
: Default
::default(),
365 cache
: Cache
::new(render_options
.document_private
),
366 inlined
: FxHashSet
::default(),
372 // Small hack to force the Sized trait to be present.
374 // Note that in case of `#![no_core]`, the trait is not available.
375 if let Some(sized_trait_did
) = ctxt
.tcx
.lang_items().sized_trait() {
376 let sized_trait
= build_external_trait(&mut ctxt
, sized_trait_did
);
377 ctxt
.external_traits
.borrow_mut().insert(sized_trait_did
, sized_trait
);
380 debug
!("crate: {:?}", tcx
.hir().krate());
382 let mut krate
= tcx
.sess
.time("clean_crate", || clean
::krate(&mut ctxt
));
384 if krate
.module
.doc_value().map(|d
| d
.is_empty()).unwrap_or(true) {
386 "The following guide may be of use:\n\
387 {}/rustdoc/how-to-write-documentation.html",
388 crate::DOC_RUST_LANG_ORG_CHANNEL
390 tcx
.struct_lint_node(
391 crate::lint
::MISSING_CRATE_LEVEL_DOCS
,
392 DocContext
::as_local_hir_id(tcx
, krate
.module
.item_id
).unwrap(),
393 "no documentation found for this crate's top-level module",
394 |lint
| lint
.help(help
),
398 fn report_deprecated_attr(name
: &str, diag
: &rustc_errors
::Handler
, sp
: Span
) {
400 diag
.struct_span_warn(sp
, &format
!("the `#![doc({})]` attribute is deprecated", name
));
402 "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
403 for more information",
406 if name
== "no_default_passes" {
407 msg
.help("`#![doc(no_default_passes)]` no longer functions; you may want to use `#![doc(document_private_items)]`");
408 } else if name
.starts_with("passes") {
409 msg
.help("`#![doc(passes = \"...\")]` no longer functions; you may want to use `#![doc(document_private_items)]`");
410 } else if name
.starts_with("plugins") {
411 msg
.warn("`#![doc(plugins = \"...\")]` no longer functions; see CVE-2018-1000622 <https://nvd.nist.gov/vuln/detail/CVE-2018-1000622>");
417 // Process all of the crate attributes, extracting plugin metadata along
418 // with the passes which we are supposed to run.
419 for attr
in krate
.module
.attrs
.lists(sym
::doc
) {
420 let diag
= ctxt
.sess().diagnostic();
422 let name
= attr
.name_or_empty();
423 // `plugins = "..."`, `no_default_passes`, and `passes = "..."` have no effect
424 if attr
.is_word() && name
== sym
::no_default_passes
{
425 report_deprecated_attr("no_default_passes", diag
, attr
.span());
426 } else if attr
.value_str().is_some() {
429 report_deprecated_attr("passes = \"...\"", diag
, attr
.span());
432 report_deprecated_attr("plugins = \"...\"", diag
, attr
.span());
438 if attr
.is_word() && name
== sym
::document_private_items
{
439 ctxt
.render_options
.document_private
= true;
443 info
!("Executing passes");
445 for p
in passes
::defaults(show_coverage
) {
446 let run
= match p
.condition
{
448 WhenDocumentPrivate
=> ctxt
.render_options
.document_private
,
449 WhenNotDocumentPrivate
=> !ctxt
.render_options
.document_private
,
450 WhenNotDocumentHidden
=> !ctxt
.render_options
.document_hidden
,
453 debug
!("running pass {}", p
.pass
.name
);
454 krate
= tcx
.sess
.time(p
.pass
.name
, || (p
.pass
.run
)(krate
, &mut ctxt
));
458 tcx
.sess
.time("check_lint_expectations", || tcx
.check_expectations(Some(sym
::rustdoc
)));
460 if tcx
.sess
.diagnostic().has_errors_or_lint_errors().is_some() {
461 rustc_errors
::FatalError
.raise();
464 krate
= tcx
.sess
.time("create_format_cache", || Cache
::populate(&mut ctxt
, krate
));
466 (krate
, ctxt
.render_options
, ctxt
.cache
)
469 /// Due to <https://github.com/rust-lang/rust/pull/73566>,
470 /// the name resolution pass may find errors that are never emitted.
471 /// If typeck is called after this happens, then we'll get an ICE:
472 /// 'Res::Error found but not reported'. To avoid this, emit the errors now.
473 struct EmitIgnoredResolutionErrors
<'tcx
> {
477 impl<'tcx
> EmitIgnoredResolutionErrors
<'tcx
> {
478 fn new(tcx
: TyCtxt
<'tcx
>) -> Self {
483 impl<'tcx
> Visitor
<'tcx
> for EmitIgnoredResolutionErrors
<'tcx
> {
484 type NestedFilter
= nested_filter
::OnlyBodies
;
486 fn nested_visit_map(&mut self) -> Self::Map
{
487 // We need to recurse into nested closures,
488 // since those will fallback to the parent for type checking.
492 fn visit_path(&mut self, path
: &Path
<'tcx
>, _id
: HirId
) {
493 debug
!("visiting path {:?}", path
);
494 if path
.res
== Res
::Err
{
495 // We have less context here than in rustc_resolve,
496 // so we can only emit the name and span.
497 // However we can give a hint that rustc_resolve will have more info.
499 "could not resolve path `{}`",
502 .map(|segment
| segment
.ident
.as_str())
506 let mut err
= rustc_errors
::struct_span_err
!(
510 "failed to resolve: {}",
513 err
.span_label(path
.span
, label
);
514 err
.note("this error was originally ignored because you are running `rustdoc`");
515 err
.note("try running again with `rustc` or `cargo check` and you may get a more detailed error");
518 // We could have an outer resolution that succeeded,
519 // but with generic parameters that failed.
520 // Recurse into the segments so we catch those too.
521 intravisit
::walk_path(self, path
);
525 /// `DefId` or parameter index (`ty::ParamTy.index`) of a synthetic type parameter
526 /// for `impl Trait` in argument position.
527 #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
528 pub(crate) enum ImplTraitParam
{
533 impl From
<DefId
> for ImplTraitParam
{
534 fn from(did
: DefId
) -> Self {
535 ImplTraitParam
::DefId(did
)
539 impl From
<u32> for ImplTraitParam
{
540 fn from(idx
: u32) -> Self {
541 ImplTraitParam
::ParamIndex(idx
)