1 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
2 use rustc_data_structures::sync::{self, Lrc};
3 use rustc_driver::abort_on_err;
4 use rustc_errors::emitter::{Emitter, EmitterWriter};
5 use rustc_errors::json::JsonEmitter;
6 use rustc_feature::UnstableFeatures;
7 use rustc_hir::def::Res;
8 use rustc_hir::def_id::{DefId, LocalDefId};
11 intravisit::{self, NestedVisitorMap, Visitor},
14 use rustc_interface::{interface, Queries};
15 use rustc_middle::hir::map::Map;
16 use rustc_middle::middle::privacy::AccessLevels;
17 use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
18 use rustc_resolve as resolve;
19 use rustc_session::config::{self, CrateType, ErrorOutputType};
20 use rustc_session::lint;
21 use rustc_session::DiagnosticOutput;
22 use rustc_session::Session;
23 use rustc_span::source_map;
24 use rustc_span::symbol::sym;
27 use std::cell::RefCell;
28 use std::lazy::SyncLazy;
32 use crate::clean::inline::build_external_trait;
33 use crate::clean::{self, ItemId, TraitWithExtraInfo};
34 use crate::config::{Options as RustdocOptions, OutputFormat, RenderOptions};
35 use crate::formats::cache::Cache;
36 use crate::passes::{self, Condition::*, ConditionalPass};
38 crate use rustc_session::config::{DebuggingOptions, Input, Options};
40 crate struct DocContext<'tcx> {
41 crate tcx: TyCtxt<'tcx>,
42 /// Name resolver. Used for intra-doc links.
44 /// The `Rc<RefCell<...>>` wrapping is needed because that is what's returned by
45 /// [`Queries::expansion()`].
46 // FIXME: see if we can get rid of this RefCell somehow
47 crate resolver: Rc<RefCell<interface::BoxedResolver>>,
48 /// Used for normalization.
50 /// Most of this logic is copied from rustc_lint::late.
51 crate param_env: ParamEnv<'tcx>,
52 /// Later on moved through `clean::Crate` into `cache`
53 crate external_traits: Rc<RefCell<FxHashMap<DefId, clean::TraitWithExtraInfo>>>,
54 /// Used while populating `external_traits` to ensure we don't process the same trait twice at
56 crate active_extern_traits: FxHashSet<DefId>,
57 // The current set of parameter substitutions,
58 // for expanding type aliases at the HIR level:
59 /// Table `DefId` of type, lifetime, or const parameter -> substituted type, lifetime, or const
60 crate substs: FxHashMap<DefId, clean::SubstParam>,
61 /// Table synthetic type parameter for `impl Trait` in argument position -> bounds
62 crate impl_trait_bounds: FxHashMap<ImplTraitParam, Vec<clean::GenericBound>>,
63 /// Auto-trait or blanket impls processed so far, as `(self_ty, trait_def_id)`.
64 // FIXME(eddyb) make this a `ty::TraitRef<'tcx>` set.
65 crate generated_synthetics: FxHashSet<(Ty<'tcx>, DefId)>,
66 crate auto_traits: Vec<DefId>,
67 /// The options given to rustdoc that could be relevant to a pass.
68 crate render_options: RenderOptions,
69 /// The traits in scope for a given module.
71 /// See `collect_intra_doc_links::traits_implemented_by` for more details.
72 /// `map<module, set<trait>>`
73 crate module_trait_cache: FxHashMap<DefId, FxHashSet<DefId>>,
74 /// This same cache is used throughout rustdoc, including in [`crate::html::render`].
76 /// Used by [`clean::inline`] to tell if an item has already been inlined.
77 crate inlined: FxHashSet<ItemId>,
78 /// Used by `calculate_doc_coverage`.
79 crate output_format: OutputFormat,
82 impl<'tcx> DocContext<'tcx> {
83 crate fn sess(&self) -> &'tcx Session {
87 crate fn with_param_env<T, F: FnOnce(&mut Self) -> T>(&mut self, def_id: DefId, f: F) -> T {
88 let old_param_env = mem::replace(&mut self.param_env, self.tcx.param_env(def_id));
90 self.param_env = old_param_env;
94 crate fn enter_resolver<F, R>(&self, f: F) -> R
96 F: FnOnce(&mut resolve::Resolver<'_>) -> R,
98 self.resolver.borrow_mut().access(f)
101 /// Call the closure with the given parameters set as
102 /// the substitutions for a type alias' RHS.
103 crate fn enter_alias<F, R>(&mut self, substs: FxHashMap<DefId, clean::SubstParam>, f: F) -> R
105 F: FnOnce(&mut Self) -> R,
107 let old_substs = mem::replace(&mut self.substs, substs);
109 self.substs = old_substs;
113 /// Like `hir().local_def_id_to_hir_id()`, but skips calling it on fake DefIds.
114 /// (This avoids a slice-index-out-of-bounds panic.)
115 crate fn as_local_hir_id(tcx: TyCtxt<'_>, def_id: ItemId) -> Option<HirId> {
117 ItemId::DefId(real_id) => {
118 real_id.as_local().map(|def_id| tcx.hir().local_def_id_to_hir_id(def_id))
120 // FIXME: Can this be `Some` for `Auto` or `Blanket`?
126 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
128 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
129 /// will be created for the handler.
130 crate fn new_handler(
131 error_format: ErrorOutputType,
132 source_map: Option<Lrc<source_map::SourceMap>>,
133 debugging_opts: &DebuggingOptions,
134 ) -> rustc_errors::Handler {
135 let emitter: Box<dyn Emitter + sync::Send> = match error_format {
136 ErrorOutputType::HumanReadable(kind) => {
137 let (short, color_config) = kind.unzip();
139 EmitterWriter::stderr(
141 source_map.map(|sm| sm as _),
143 debugging_opts.teach,
144 debugging_opts.terminal_width,
147 .ui_testing(debugging_opts.ui_testing),
150 ErrorOutputType::Json { pretty, json_rendered } => {
151 let source_map = source_map.unwrap_or_else(|| {
152 Lrc::new(source_map::SourceMap::new(source_map::FilePathMapping::empty()))
160 debugging_opts.terminal_width,
163 .ui_testing(debugging_opts.ui_testing),
168 rustc_errors::Handler::with_emitter_and_flags(
170 debugging_opts.diagnostic_handler_flags(true),
174 /// Parse, resolve, and typecheck the given crate.
175 crate fn create_config(
194 ) -> rustc_interface::Config {
195 // Add the doc cfg into the doc build.
196 cfgs.push("doc".to_string());
198 let cpath = Some(input.clone());
199 let input = Input::File(input);
201 // By default, rustdoc ignores all lints.
202 // Specifically unblock lints relevant to documentation or the lint machinery itself.
203 let mut lints_to_show = vec![
204 // it's unclear whether these should be part of rustdoc directly (#77364)
205 rustc_lint::builtin::MISSING_DOCS.name.to_string(),
206 rustc_lint::builtin::INVALID_DOC_ATTRIBUTES.name.to_string(),
207 // these are definitely not part of rustdoc, but we want to warn on them anyway.
208 rustc_lint::builtin::RENAMED_AND_REMOVED_LINTS.name.to_string(),
209 rustc_lint::builtin::UNKNOWN_LINTS.name.to_string(),
211 lints_to_show.extend(crate::lint::RUSTDOC_LINTS.iter().map(|lint| lint.name.to_string()));
213 let (lint_opts, lint_caps) = crate::lint::init_lints(lints_to_show, lint_opts, |lint| {
214 Some((lint.name_lower(), lint::Allow))
218 if proc_macro_crate { vec![CrateType::ProcMacro] } else { vec![CrateType::Rlib] };
219 // plays with error output here!
220 let sessopts = config::Options {
228 target_triple: target,
229 unstable_features: UnstableFeatures::from_environment(crate_name.as_deref()),
230 actually_rustdoc: true,
241 crate_cfg: interface::parse_cfgspecs(cfgs),
247 diagnostic_output: DiagnosticOutput::Default,
250 parse_sess_created: None,
251 register_lints: Some(box crate::lint::register_lints),
252 override_queries: Some(|_sess, providers, _external_providers| {
253 // Most lints will require typechecking, so just don't run them.
254 providers.lint_mod = |_, _| {};
255 // Prevent `rustc_typeck::check_crate` from calling `typeck` on all bodies.
256 providers.typeck_item_bodies = |_, _| {};
257 // hack so that `used_trait_imports` won't try to call typeck
258 providers.used_trait_imports = |_, _| {
259 static EMPTY_SET: SyncLazy<FxHashSet<LocalDefId>> =
260 SyncLazy::new(FxHashSet::default);
263 // In case typeck does end up being called, don't ICE in case there were name resolution errors
264 providers.typeck = move |tcx, def_id| {
265 // Closures' tables come from their outermost function,
266 // as they are part of the same "inference environment".
267 // This avoids emitting errors for the parent twice (see similar code in `typeck_with_fallback`)
268 let outer_def_id = tcx.closure_base_def_id(def_id.to_def_id()).expect_local();
269 if outer_def_id != def_id {
270 return tcx.typeck(outer_def_id);
274 let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(def_id)));
275 debug!("visiting body for {:?}", def_id);
276 EmitIgnoredResolutionErrors::new(tcx).visit_body(body);
277 (rustc_interface::DEFAULT_QUERY_PROVIDERS.typeck)(tcx, def_id)
280 make_codegen_backend: None,
281 registry: rustc_driver::diagnostics_registry(),
285 crate fn create_resolver<'a>(
286 queries: &Queries<'a>,
288 ) -> Rc<RefCell<interface::BoxedResolver>> {
289 let (krate, resolver, _) = &*abort_on_err(queries.expansion(), sess).peek();
290 let resolver = resolver.clone();
292 crate::passes::collect_intra_doc_links::load_intra_link_crates(resolver, krate)
295 crate fn run_global_ctxt(
297 resolver: Rc<RefCell<interface::BoxedResolver>>,
298 mut default_passes: passes::DefaultPassOption,
299 manual_passes: Vec<String>,
300 render_options: RenderOptions,
301 output_format: OutputFormat,
302 ) -> (clean::Crate, RenderOptions, Cache) {
303 // Certain queries assume that some checks were run elsewhere
304 // (see https://github.com/rust-lang/rust/pull/73566#issuecomment-656954425),
305 // so type-check everything other than function bodies in this crate before running lints.
307 // NOTE: this does not call `tcx.analysis()` so that we won't
308 // typeck function bodies or run the default rustc lints.
309 // (see `override_queries` in the `config`)
311 // HACK(jynelson) this calls an _extremely_ limited subset of `typeck`
312 // and might break if queries change their assumptions in the future.
314 // NOTE: This is copy/pasted from typeck/lib.rs and should be kept in sync with those changes.
315 tcx.sess.time("item_types_checking", || {
316 tcx.hir().for_each_module(|module| tcx.ensure().check_mod_item_types(module))
318 tcx.sess.abort_if_errors();
319 tcx.sess.time("missing_docs", || {
320 rustc_lint::check_crate(tcx, rustc_lint::builtin::MissingDoc::new);
322 tcx.sess.time("check_mod_attrs", || {
323 tcx.hir().for_each_module(|module| tcx.ensure().check_mod_attrs(module))
325 rustc_passes::stability::check_unused_or_stable_features(tcx);
327 let access_levels = AccessLevels {
328 map: tcx.privacy_access_levels(()).map.iter().map(|(k, v)| (k.to_def_id(), *v)).collect(),
331 let mut ctxt = DocContext {
334 param_env: ParamEnv::empty(),
335 external_traits: Default::default(),
336 active_extern_traits: Default::default(),
337 substs: Default::default(),
338 impl_trait_bounds: Default::default(),
339 generated_synthetics: Default::default(),
344 .filter(|trait_def_id| tcx.trait_is_auto(*trait_def_id))
346 module_trait_cache: FxHashMap::default(),
347 cache: Cache::new(access_levels, render_options.document_private),
348 inlined: FxHashSet::default(),
353 // Small hack to force the Sized trait to be present.
355 // Note that in case of `#![no_core]`, the trait is not available.
356 if let Some(sized_trait_did) = ctxt.tcx.lang_items().sized_trait() {
357 let mut sized_trait = build_external_trait(&mut ctxt, sized_trait_did);
358 sized_trait.is_auto = true;
361 .insert(sized_trait_did, TraitWithExtraInfo { trait_: sized_trait, is_notable: false });
364 debug!("crate: {:?}", tcx.hir().krate());
366 let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
368 if krate.module.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
370 "The following guide may be of use:\n\
371 {}/rustdoc/how-to-write-documentation.html",
372 crate::DOC_RUST_LANG_ORG_CHANNEL
374 tcx.struct_lint_node(
375 crate::lint::MISSING_CRATE_LEVEL_DOCS,
376 DocContext::as_local_hir_id(tcx, krate.module.def_id).unwrap(),
379 lint.build("no documentation found for this crate's top-level module");
386 fn report_deprecated_attr(name: &str, diag: &rustc_errors::Handler, sp: Span) {
388 diag.struct_span_warn(sp, &format!("the `#![doc({})]` attribute is deprecated", name));
390 "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
391 for more information",
394 if name == "no_default_passes" {
395 msg.help("you may want to use `#![doc(document_private_items)]`");
396 } else if name.starts_with("plugins") {
397 msg.warn("`#![doc(plugins = \"...\")]` no longer functions; see CVE-2018-1000622 <https://nvd.nist.gov/vuln/detail/CVE-2018-1000622>");
403 let parse_pass = |name: &str, sp: Option<Span>| {
404 if let Some(pass) = passes::find_pass(name) {
405 Some(ConditionalPass::always(pass))
407 let msg = &format!("ignoring unknown pass `{}`", name);
408 let mut warning = if let Some(sp) = sp {
409 tcx.sess.struct_span_warn(sp, msg)
411 tcx.sess.struct_warn(msg)
413 if name == "collapse-docs" {
414 warning.note("the `collapse-docs` pass was removed in #80261 <https://github.com/rust-lang/rust/pull/80261>");
421 let mut manual_passes: Vec<_> =
422 manual_passes.into_iter().flat_map(|name| parse_pass(&name, None)).collect();
424 // Process all of the crate attributes, extracting plugin metadata along
425 // with the passes which we are supposed to run.
426 for attr in krate.module.attrs.lists(sym::doc) {
427 let diag = ctxt.sess().diagnostic();
429 let name = attr.name_or_empty();
431 if name == sym::no_default_passes {
432 report_deprecated_attr("no_default_passes", diag, attr.span());
433 if default_passes == passes::DefaultPassOption::Default {
434 default_passes = passes::DefaultPassOption::None;
437 } else if let Some(value) = attr.value_str() {
440 report_deprecated_attr("passes = \"...\"", diag, attr.span());
443 report_deprecated_attr("plugins = \"...\"", diag, attr.span());
448 for name in value.as_str().split_whitespace() {
449 let span = attr.name_value_literal_span().unwrap_or_else(|| attr.span());
450 manual_passes.extend(parse_pass(name, Some(span)));
454 if attr.is_word() && name == sym::document_private_items {
455 ctxt.render_options.document_private = true;
459 let passes = passes::defaults(default_passes).iter().copied().chain(manual_passes);
460 info!("Executing passes");
463 let run = match p.condition {
465 WhenDocumentPrivate => ctxt.render_options.document_private,
466 WhenNotDocumentPrivate => !ctxt.render_options.document_private,
467 WhenNotDocumentHidden => !ctxt.render_options.document_hidden,
470 debug!("running pass {}", p.pass.name);
471 krate = ctxt.tcx.sess.time(p.pass.name, || (p.pass.run)(krate, &mut ctxt));
475 ctxt.sess().abort_if_errors();
477 let render_options = ctxt.render_options;
478 let mut cache = ctxt.cache;
479 krate = tcx.sess.time("create_format_cache", || cache.populate(krate, tcx, &render_options));
481 // The main crate doc comments are always collapsed.
482 krate.collapsed = true;
484 (krate, render_options, cache)
487 /// Due to <https://github.com/rust-lang/rust/pull/73566>,
488 /// the name resolution pass may find errors that are never emitted.
489 /// If typeck is called after this happens, then we'll get an ICE:
490 /// 'Res::Error found but not reported'. To avoid this, emit the errors now.
491 struct EmitIgnoredResolutionErrors<'tcx> {
495 impl<'tcx> EmitIgnoredResolutionErrors<'tcx> {
496 fn new(tcx: TyCtxt<'tcx>) -> Self {
501 impl<'tcx> Visitor<'tcx> for EmitIgnoredResolutionErrors<'tcx> {
502 type Map = Map<'tcx>;
504 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
505 // We need to recurse into nested closures,
506 // since those will fallback to the parent for type checking.
507 NestedVisitorMap::OnlyBodies(self.tcx.hir())
510 fn visit_path(&mut self, path: &'tcx Path<'_>, _id: HirId) {
511 debug!("visiting path {:?}", path);
512 if path.res == Res::Err {
513 // We have less context here than in rustc_resolve,
514 // so we can only emit the name and span.
515 // However we can give a hint that rustc_resolve will have more info.
517 "could not resolve path `{}`",
520 .map(|segment| segment.ident.as_str().to_string())
524 let mut err = rustc_errors::struct_span_err!(
528 "failed to resolve: {}",
531 err.span_label(path.span, label);
532 err.note("this error was originally ignored because you are running `rustdoc`");
533 err.note("try running again with `rustc` or `cargo check` and you may get a more detailed error");
536 // We could have an outer resolution that succeeded,
537 // but with generic parameters that failed.
538 // Recurse into the segments so we catch those too.
539 intravisit::walk_path(self, path);
543 /// `DefId` or parameter index (`ty::ParamTy.index`) of a synthetic type parameter
544 /// for `impl Trait` in argument position.
545 #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
546 crate enum ImplTraitParam {
551 impl From<DefId> for ImplTraitParam {
552 fn from(did: DefId) -> Self {
553 ImplTraitParam::DefId(did)
557 impl From<u32> for ImplTraitParam {
558 fn from(idx: u32) -> Self {
559 ImplTraitParam::ParamIndex(idx)