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::{Namespace::TypeNS, Res};
8 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, LocalDefId, CRATE_DEF_INDEX, LOCAL_CRATE};
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;
25 use rustc_span::DUMMY_SP;
29 use std::{cell::RefCell, collections::hash_map::Entry};
32 use crate::clean::inline::build_external_trait;
33 use crate::clean::{AttributesExt, TraitWithExtraInfo, MAX_DEF_IDX};
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 type and lifetime substitutions,
58 // for expanding type aliases at the HIR level:
59 /// Table `DefId` of type parameter -> substituted type
60 crate ty_substs: FxHashMap<DefId, clean::Type>,
61 /// Table `DefId` of lifetime parameter -> substituted lifetime
62 crate lt_substs: FxHashMap<DefId, clean::Lifetime>,
63 /// Table `DefId` of const parameter -> substituted const
64 crate ct_substs: FxHashMap<DefId, clean::Constant>,
65 /// Table synthetic type parameter for `impl Trait` in argument position -> bounds
66 crate impl_trait_bounds: FxHashMap<ImplTraitParam, Vec<clean::GenericBound>>,
67 crate fake_def_ids: FxHashMap<CrateNum, DefIndex>,
68 /// Auto-trait or blanket impls processed so far, as `(self_ty, trait_def_id)`.
69 // FIXME(eddyb) make this a `ty::TraitRef<'tcx>` set.
70 crate generated_synthetics: FxHashSet<(Ty<'tcx>, DefId)>,
71 crate auto_traits: Vec<DefId>,
72 /// The options given to rustdoc that could be relevant to a pass.
73 crate render_options: RenderOptions,
74 /// The traits in scope for a given module.
76 /// See `collect_intra_doc_links::traits_implemented_by` for more details.
77 /// `map<module, set<trait>>`
78 crate module_trait_cache: RefCell<FxHashMap<DefId, FxHashSet<DefId>>>,
79 /// This same cache is used throughout rustdoc, including in [`crate::html::render`].
81 /// Used by [`clean::inline`] to tell if an item has already been inlined.
82 crate inlined: FxHashSet<DefId>,
83 /// Used by `calculate_doc_coverage`.
84 crate output_format: OutputFormat,
87 impl<'tcx> DocContext<'tcx> {
88 crate fn sess(&self) -> &'tcx Session {
92 crate fn with_param_env<T, F: FnOnce(&mut Self) -> T>(&mut self, def_id: DefId, f: F) -> T {
93 let old_param_env = mem::replace(&mut self.param_env, self.tcx.param_env(def_id));
95 self.param_env = old_param_env;
99 crate fn enter_resolver<F, R>(&self, f: F) -> R
101 F: FnOnce(&mut resolve::Resolver<'_>) -> R,
103 self.resolver.borrow_mut().access(f)
106 /// Call the closure with the given parameters set as
107 /// the substitutions for a type alias' RHS.
108 crate fn enter_alias<F, R>(
110 ty_substs: FxHashMap<DefId, clean::Type>,
111 lt_substs: FxHashMap<DefId, clean::Lifetime>,
112 ct_substs: FxHashMap<DefId, clean::Constant>,
116 F: FnOnce(&mut Self) -> R,
118 let (old_tys, old_lts, old_cts) = (
119 mem::replace(&mut self.ty_substs, ty_substs),
120 mem::replace(&mut self.lt_substs, lt_substs),
121 mem::replace(&mut self.ct_substs, ct_substs),
124 self.ty_substs = old_tys;
125 self.lt_substs = old_lts;
126 self.ct_substs = old_cts;
130 /// Create a new "fake" [`DefId`].
132 /// This is an ugly hack, but it's the simplest way to handle synthetic impls without greatly
133 /// refactoring either rustdoc or [`rustc_middle`]. In particular, allowing new [`DefId`]s
134 /// to be registered after the AST is constructed would require storing the [`DefId`] mapping
135 /// in a [`RefCell`], decreasing the performance for normal compilation for very little gain.
137 /// Instead, we construct "fake" [`DefId`]s, which start immediately after the last `DefId`.
138 /// In the [`Debug`] impl for [`clean::Item`], we explicitly check for fake `DefId`s,
139 /// as we'll end up with a panic if we use the `DefId` `Debug` impl for fake `DefId`s.
141 /// [`RefCell`]: std::cell::RefCell
142 /// [`Debug`]: std::fmt::Debug
143 /// [`clean::Item`]: crate::clean::types::Item
144 crate fn next_def_id(&mut self, crate_num: CrateNum) -> DefId {
145 let def_index = match self.fake_def_ids.entry(crate_num) {
146 Entry::Vacant(e) => {
148 let num_def_idx = if crate_num == LOCAL_CRATE {
149 self.tcx.hir().definitions().def_path_table().num_def_ids()
151 self.resolver.borrow_mut().access(|r| r.cstore().num_def_ids(crate_num))
154 DefIndex::from_usize(num_def_idx)
157 MAX_DEF_IDX.with(|m| {
158 m.borrow_mut().insert(crate_num, num_def_idx);
160 e.insert(num_def_idx)
162 Entry::Occupied(e) => e.into_mut(),
164 *def_index = *def_index + 1;
166 DefId { krate: crate_num, index: *def_index }
169 /// Like `hir().local_def_id_to_hir_id()`, but skips calling it on fake DefIds.
170 /// (This avoids a slice-index-out-of-bounds panic.)
171 crate fn as_local_hir_id(&self, def_id: DefId) -> Option<HirId> {
172 if MAX_DEF_IDX.with(|m| {
173 m.borrow().get(&def_id.krate).map(|&idx| idx <= def_id.index).unwrap_or(false)
177 def_id.as_local().map(|def_id| self.tcx.hir().local_def_id_to_hir_id(def_id))
182 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
184 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
185 /// will be created for the handler.
186 crate fn new_handler(
187 error_format: ErrorOutputType,
188 source_map: Option<Lrc<source_map::SourceMap>>,
189 debugging_opts: &DebuggingOptions,
190 ) -> rustc_errors::Handler {
191 let emitter: Box<dyn Emitter + sync::Send> = match error_format {
192 ErrorOutputType::HumanReadable(kind) => {
193 let (short, color_config) = kind.unzip();
195 EmitterWriter::stderr(
197 source_map.map(|sm| sm as _),
199 debugging_opts.teach,
200 debugging_opts.terminal_width,
203 .ui_testing(debugging_opts.ui_testing),
206 ErrorOutputType::Json { pretty, json_rendered } => {
207 let source_map = source_map.unwrap_or_else(|| {
208 Lrc::new(source_map::SourceMap::new(source_map::FilePathMapping::empty()))
216 debugging_opts.terminal_width,
219 .ui_testing(debugging_opts.ui_testing),
224 rustc_errors::Handler::with_emitter_and_flags(
226 debugging_opts.diagnostic_handler_flags(true),
230 /// This function is used to setup the lint initialization. By default, in rustdoc, everything
231 /// is "allowed". Depending if we run in test mode or not, we want some of them to be at their
232 /// default level. For example, the "INVALID_CODEBLOCK_ATTRIBUTES" lint is activated in both
235 /// A little detail easy to forget is that there is a way to set the lint level for all lints
236 /// through the "WARNINGS" lint. To prevent this to happen, we set it back to its "normal" level
237 /// inside this function.
239 /// It returns a tuple containing:
240 /// * Vector of tuples of lints' name and their associated "max" level
241 /// * HashMap of lint id with their associated "max" level
242 pub(crate) fn init_lints<F>(
243 mut allowed_lints: Vec<String>,
244 lint_opts: Vec<(String, lint::Level)>,
246 ) -> (Vec<(String, lint::Level)>, FxHashMap<lint::LintId, lint::Level>)
248 F: Fn(&lint::Lint) -> Option<(String, lint::Level)>,
250 let warnings_lint_name = lint::builtin::WARNINGS.name;
252 allowed_lints.push(warnings_lint_name.to_owned());
253 allowed_lints.extend(lint_opts.iter().map(|(lint, _)| lint).cloned());
256 lint::builtin::HardwiredLints::get_lints()
258 .chain(rustc_lint::SoftLints::get_lints().into_iter())
261 let lint_opts = lints()
263 // Permit feature-gated lints to avoid feature errors when trying to
265 if lint.feature_gate.is_some() || allowed_lints.iter().any(|l| lint.name == l) {
271 .chain(lint_opts.into_iter())
272 .collect::<Vec<_>>();
274 let lint_caps = lints()
276 // We don't want to allow *all* lints so let's ignore
278 if allowed_lints.iter().any(|l| lint.name == l) {
281 Some((lint::LintId::of(lint), lint::Allow))
285 (lint_opts, lint_caps)
288 /// Parse, resolve, and typecheck the given crate.
289 crate fn create_config(
309 ) -> rustc_interface::Config {
310 // Add the doc cfg into the doc build.
311 cfgs.push("doc".to_string());
313 let cpath = Some(input.clone());
314 let input = Input::File(input);
316 let broken_intra_doc_links = lint::builtin::BROKEN_INTRA_DOC_LINKS.name;
317 let private_intra_doc_links = lint::builtin::PRIVATE_INTRA_DOC_LINKS.name;
318 let missing_docs = rustc_lint::builtin::MISSING_DOCS.name;
319 let missing_doc_example = rustc_lint::builtin::MISSING_DOC_CODE_EXAMPLES.name;
320 let private_doc_tests = rustc_lint::builtin::PRIVATE_DOC_TESTS.name;
321 let no_crate_level_docs = rustc_lint::builtin::MISSING_CRATE_LEVEL_DOCS.name;
322 let invalid_codeblock_attributes_name = rustc_lint::builtin::INVALID_CODEBLOCK_ATTRIBUTES.name;
323 let invalid_html_tags = rustc_lint::builtin::INVALID_HTML_TAGS.name;
324 let renamed_and_removed_lints = rustc_lint::builtin::RENAMED_AND_REMOVED_LINTS.name;
325 let non_autolinks = rustc_lint::builtin::NON_AUTOLINKS.name;
326 let unknown_lints = rustc_lint::builtin::UNKNOWN_LINTS.name;
328 // In addition to those specific lints, we also need to allow those given through
329 // command line, otherwise they'll get ignored and we don't want that.
330 let lints_to_show = vec![
331 broken_intra_doc_links.to_owned(),
332 private_intra_doc_links.to_owned(),
333 missing_docs.to_owned(),
334 missing_doc_example.to_owned(),
335 private_doc_tests.to_owned(),
336 no_crate_level_docs.to_owned(),
337 invalid_codeblock_attributes_name.to_owned(),
338 invalid_html_tags.to_owned(),
339 renamed_and_removed_lints.to_owned(),
340 unknown_lints.to_owned(),
341 non_autolinks.to_owned(),
344 let (lint_opts, lint_caps) = init_lints(lints_to_show, lint_opts, |lint| {
345 // FIXME: why is this necessary?
346 if lint.name == broken_intra_doc_links || lint.name == invalid_codeblock_attributes_name {
349 Some((lint.name_lower(), lint::Allow))
354 if proc_macro_crate { vec![CrateType::ProcMacro] } else { vec![CrateType::Rlib] };
355 // plays with error output here!
356 let sessopts = config::Options {
360 lint_opts: if !display_warnings { lint_opts } else { vec![] },
364 target_triple: target,
365 unstable_features: UnstableFeatures::from_environment(crate_name.as_deref()),
366 actually_rustdoc: true,
377 crate_cfg: interface::parse_cfgspecs(cfgs),
383 diagnostic_output: DiagnosticOutput::Default,
386 register_lints: None,
387 override_queries: Some(|_sess, providers, _external_providers| {
388 // Most lints will require typechecking, so just don't run them.
389 providers.lint_mod = |_, _| {};
390 // Prevent `rustc_typeck::check_crate` from calling `typeck` on all bodies.
391 providers.typeck_item_bodies = |_, _| {};
392 // hack so that `used_trait_imports` won't try to call typeck
393 providers.used_trait_imports = |_, _| {
395 static ref EMPTY_SET: FxHashSet<LocalDefId> = FxHashSet::default();
399 // In case typeck does end up being called, don't ICE in case there were name resolution errors
400 providers.typeck = move |tcx, def_id| {
401 // Closures' tables come from their outermost function,
402 // as they are part of the same "inference environment".
403 // This avoids emitting errors for the parent twice (see similar code in `typeck_with_fallback`)
404 let outer_def_id = tcx.closure_base_def_id(def_id.to_def_id()).expect_local();
405 if outer_def_id != def_id {
406 return tcx.typeck(outer_def_id);
410 let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(def_id)));
411 debug!("visiting body for {:?}", def_id);
412 EmitIgnoredResolutionErrors::new(tcx).visit_body(body);
413 (rustc_interface::DEFAULT_QUERY_PROVIDERS.typeck)(tcx, def_id)
416 make_codegen_backend: None,
417 registry: rustc_driver::diagnostics_registry(),
421 crate fn create_resolver<'a>(
422 externs: config::Externs,
423 queries: &Queries<'a>,
425 ) -> Rc<RefCell<interface::BoxedResolver>> {
426 let extern_names: Vec<String> = externs
428 .filter(|(_, entry)| entry.add_prelude)
429 .map(|(name, _)| name)
433 let parts = abort_on_err(queries.expansion(), sess).peek();
434 let resolver = parts.1.borrow();
436 // Before we actually clone it, let's force all the extern'd crates to
437 // actually be loaded, just in case they're only referred to inside
439 resolver.borrow_mut().access(|resolver| {
440 sess.time("load_extern_crates", || {
441 for extern_name in &extern_names {
442 debug!("loading extern crate {}", extern_name);
443 if let Err(()) = resolver
444 .resolve_str_path_error(
448 LocalDefId { local_def_index: CRATE_DEF_INDEX }.to_def_id(),
450 warn!("unable to resolve external crate {} (do you have an unused `--extern` crate?)", extern_name)
456 // Now we're good to clone the resolver because everything should be loaded
460 crate fn run_global_ctxt(
462 resolver: Rc<RefCell<interface::BoxedResolver>>,
463 mut default_passes: passes::DefaultPassOption,
464 mut manual_passes: Vec<String>,
465 render_options: RenderOptions,
466 output_format: OutputFormat,
467 ) -> (clean::Crate, RenderOptions, Cache) {
468 // Certain queries assume that some checks were run elsewhere
469 // (see https://github.com/rust-lang/rust/pull/73566#issuecomment-656954425),
470 // so type-check everything other than function bodies in this crate before running lints.
472 // NOTE: this does not call `tcx.analysis()` so that we won't
473 // typeck function bodies or run the default rustc lints.
474 // (see `override_queries` in the `config`)
476 // HACK(jynelson) this calls an _extremely_ limited subset of `typeck`
477 // and might break if queries change their assumptions in the future.
479 // NOTE: This is copy/pasted from typeck/lib.rs and should be kept in sync with those changes.
480 tcx.sess.time("item_types_checking", || {
481 for &module in tcx.hir().krate().modules.keys() {
482 tcx.ensure().check_mod_item_types(module);
485 tcx.sess.abort_if_errors();
486 tcx.sess.time("missing_docs", || {
487 rustc_lint::check_crate(tcx, rustc_lint::builtin::MissingDoc::new);
489 tcx.sess.time("check_mod_attrs", || {
490 for &module in tcx.hir().krate().modules.keys() {
491 tcx.ensure().check_mod_attrs(module);
494 rustc_passes::stability::check_unused_or_stable_features(tcx);
496 let access_levels = tcx.privacy_access_levels(LOCAL_CRATE);
497 // Convert from a HirId set to a DefId set since we don't always have easy access
498 // to the map from defid -> hirid
499 let access_levels = AccessLevels {
503 .map(|(&k, &v)| (tcx.hir().local_def_id(k).to_def_id(), v))
507 let mut ctxt = DocContext {
510 param_env: ParamEnv::empty(),
511 external_traits: Default::default(),
512 active_extern_traits: Default::default(),
513 ty_substs: Default::default(),
514 lt_substs: Default::default(),
515 ct_substs: Default::default(),
516 impl_trait_bounds: Default::default(),
517 fake_def_ids: Default::default(),
518 generated_synthetics: Default::default(),
520 .all_traits(LOCAL_CRATE)
523 .filter(|trait_def_id| tcx.trait_is_auto(*trait_def_id))
525 module_trait_cache: RefCell::new(FxHashMap::default()),
526 cache: Cache::new(access_levels, render_options.document_private),
527 inlined: FxHashSet::default(),
532 // Small hack to force the Sized trait to be present.
534 // Note that in case of `#![no_core]`, the trait is not available.
535 if let Some(sized_trait_did) = ctxt.tcx.lang_items().sized_trait() {
536 let mut sized_trait = build_external_trait(&mut ctxt, sized_trait_did);
537 sized_trait.is_auto = true;
538 ctxt.external_traits.borrow_mut().insert(
540 TraitWithExtraInfo { trait_: sized_trait, is_spotlight: false },
544 debug!("crate: {:?}", tcx.hir().krate());
546 let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
548 if let Some(ref m) = krate.module {
549 if m.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
550 let help = "The following guide may be of use:\n\
551 https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html";
552 tcx.struct_lint_node(
553 rustc_lint::builtin::MISSING_CRATE_LEVEL_DOCS,
554 ctxt.as_local_hir_id(m.def_id).unwrap(),
557 lint.build("no documentation found for this crate's top-level module");
565 fn report_deprecated_attr(name: &str, diag: &rustc_errors::Handler) {
567 .struct_warn(&format!("the `#![doc({})]` attribute is considered deprecated", name));
569 "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
570 for more information",
573 if name == "no_default_passes" {
574 msg.help("you may want to use `#![doc(document_private_items)]`");
580 // Process all of the crate attributes, extracting plugin metadata along
581 // with the passes which we are supposed to run.
582 for attr in krate.module.as_ref().unwrap().attrs.lists(sym::doc) {
583 let diag = ctxt.sess().diagnostic();
585 let name = attr.name_or_empty();
587 if name == sym::no_default_passes {
588 report_deprecated_attr("no_default_passes", diag);
589 if default_passes == passes::DefaultPassOption::Default {
590 default_passes = passes::DefaultPassOption::None;
593 } else if let Some(value) = attr.value_str() {
594 let sink = match name {
596 report_deprecated_attr("passes = \"...\"", diag);
600 report_deprecated_attr("plugins = \"...\"", diag);
602 "WARNING: `#![doc(plugins = \"...\")]` \
603 no longer functions; see CVE-2018-1000622"
609 for name in value.as_str().split_whitespace() {
610 sink.push(name.to_string());
614 if attr.is_word() && name == sym::document_private_items {
615 ctxt.render_options.document_private = true;
619 let passes = passes::defaults(default_passes).iter().copied().chain(
620 manual_passes.into_iter().flat_map(|name| {
621 if let Some(pass) = passes::find_pass(&name) {
622 Some(ConditionalPass::always(pass))
624 error!("unknown pass {}, skipping", name);
630 info!("Executing passes");
633 let run = match p.condition {
635 WhenDocumentPrivate => ctxt.render_options.document_private,
636 WhenNotDocumentPrivate => !ctxt.render_options.document_private,
637 WhenNotDocumentHidden => !ctxt.render_options.document_hidden,
640 debug!("running pass {}", p.pass.name);
641 krate = ctxt.tcx.sess.time(p.pass.name, || (p.pass.run)(krate, &mut ctxt));
645 ctxt.sess().abort_if_errors();
647 let render_options = ctxt.render_options;
648 let mut cache = ctxt.cache;
649 krate = tcx.sess.time("create_format_cache", || {
650 cache.populate(krate, tcx, &render_options.extern_html_root_urls, &render_options.output)
653 // The main crate doc comments are always collapsed.
654 krate.collapsed = true;
656 (krate, render_options, cache)
659 /// Due to <https://github.com/rust-lang/rust/pull/73566>,
660 /// the name resolution pass may find errors that are never emitted.
661 /// If typeck is called after this happens, then we'll get an ICE:
662 /// 'Res::Error found but not reported'. To avoid this, emit the errors now.
663 struct EmitIgnoredResolutionErrors<'tcx> {
667 impl<'tcx> EmitIgnoredResolutionErrors<'tcx> {
668 fn new(tcx: TyCtxt<'tcx>) -> Self {
673 impl<'tcx> Visitor<'tcx> for EmitIgnoredResolutionErrors<'tcx> {
674 type Map = Map<'tcx>;
676 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
677 // We need to recurse into nested closures,
678 // since those will fallback to the parent for type checking.
679 NestedVisitorMap::OnlyBodies(self.tcx.hir())
682 fn visit_path(&mut self, path: &'tcx Path<'_>, _id: HirId) {
683 debug!("visiting path {:?}", path);
684 if path.res == Res::Err {
685 // We have less context here than in rustc_resolve,
686 // so we can only emit the name and span.
687 // However we can give a hint that rustc_resolve will have more info.
689 "could not resolve path `{}`",
692 .map(|segment| segment.ident.as_str().to_string())
696 let mut err = rustc_errors::struct_span_err!(
700 "failed to resolve: {}",
703 err.span_label(path.span, label);
704 err.note("this error was originally ignored because you are running `rustdoc`");
705 err.note("try running again with `rustc` or `cargo check` and you may get a more detailed error");
708 // We could have an outer resolution that succeeded,
709 // but with generic parameters that failed.
710 // Recurse into the segments so we catch those too.
711 intravisit::walk_path(self, path);
715 /// `DefId` or parameter index (`ty::ParamTy.index`) of a synthetic type parameter
716 /// for `impl Trait` in argument position.
717 #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
718 crate enum ImplTraitParam {
723 impl From<DefId> for ImplTraitParam {
724 fn from(did: DefId) -> Self {
725 ImplTraitParam::DefId(did)
729 impl From<u32> for ImplTraitParam {
730 fn from(idx: u32) -> Self {
731 ImplTraitParam::ParamIndex(idx)