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;
27 use std::cell::{Cell, RefCell};
32 use crate::clean::{AttributesExt, MAX_DEF_ID};
33 use crate::config::{Options as RustdocOptions, RenderOptions};
34 use crate::config::{OutputFormat, RenderInfo};
35 use crate::passes::{self, Condition::*, ConditionalPass};
37 crate use rustc_session::config::{DebuggingOptions, Input, Options};
39 crate type ExternalPaths = FxHashMap<DefId, (Vec<String>, clean::TypeKind)>;
41 crate struct DocContext<'tcx> {
42 crate tcx: TyCtxt<'tcx>,
43 crate resolver: Rc<RefCell<interface::BoxedResolver>>,
44 /// Used for normalization.
46 /// Most of this logic is copied from rustc_lint::late.
47 crate param_env: Cell<ParamEnv<'tcx>>,
48 /// Later on moved into `CACHE_KEY`
49 crate renderinfo: RefCell<RenderInfo>,
50 /// Later on moved through `clean::Crate` into `CACHE_KEY`
51 crate external_traits: Rc<RefCell<FxHashMap<DefId, clean::Trait>>>,
52 /// Used while populating `external_traits` to ensure we don't process the same trait twice at
54 crate active_extern_traits: RefCell<FxHashSet<DefId>>,
55 // The current set of type and lifetime substitutions,
56 // for expanding type aliases at the HIR level:
57 /// Table `DefId` of type parameter -> substituted type
58 crate ty_substs: RefCell<FxHashMap<DefId, clean::Type>>,
59 /// Table `DefId` of lifetime parameter -> substituted lifetime
60 crate lt_substs: RefCell<FxHashMap<DefId, clean::Lifetime>>,
61 /// Table `DefId` of const parameter -> substituted const
62 crate ct_substs: RefCell<FxHashMap<DefId, clean::Constant>>,
63 /// Table synthetic type parameter for `impl Trait` in argument position -> bounds
64 crate impl_trait_bounds: RefCell<FxHashMap<ImplTraitParam, Vec<clean::GenericBound>>>,
65 crate fake_def_ids: RefCell<FxHashMap<CrateNum, DefId>>,
66 crate all_fake_def_ids: RefCell<FxHashSet<DefId>>,
67 /// Auto-trait or blanket impls processed so far, as `(self_ty, trait_def_id)`.
68 // FIXME(eddyb) make this a `ty::TraitRef<'tcx>` set.
69 crate generated_synthetics: RefCell<FxHashSet<(Ty<'tcx>, DefId)>>,
70 crate auto_traits: Vec<DefId>,
71 /// The options given to rustdoc that could be relevant to a pass.
72 crate render_options: RenderOptions,
73 /// The traits in scope for a given module.
75 /// See `collect_intra_doc_links::traits_implemented_by` for more details.
76 /// `map<module, set<trait>>`
77 crate module_trait_cache: RefCell<FxHashMap<DefId, FxHashSet<DefId>>>,
80 impl<'tcx> DocContext<'tcx> {
81 crate fn sess(&self) -> &Session {
85 crate fn with_param_env<T, F: FnOnce() -> T>(&self, def_id: DefId, f: F) -> T {
86 let old_param_env = self.param_env.replace(self.tcx.param_env(def_id));
88 self.param_env.set(old_param_env);
92 crate fn enter_resolver<F, R>(&self, f: F) -> R
94 F: FnOnce(&mut resolve::Resolver<'_>) -> R,
96 self.resolver.borrow_mut().access(f)
99 /// Call the closure with the given parameters set as
100 /// the substitutions for a type alias' RHS.
101 crate fn enter_alias<F, R>(
103 ty_substs: FxHashMap<DefId, clean::Type>,
104 lt_substs: FxHashMap<DefId, clean::Lifetime>,
105 ct_substs: FxHashMap<DefId, clean::Constant>,
111 let (old_tys, old_lts, old_cts) = (
112 mem::replace(&mut *self.ty_substs.borrow_mut(), ty_substs),
113 mem::replace(&mut *self.lt_substs.borrow_mut(), lt_substs),
114 mem::replace(&mut *self.ct_substs.borrow_mut(), ct_substs),
117 *self.ty_substs.borrow_mut() = old_tys;
118 *self.lt_substs.borrow_mut() = old_lts;
119 *self.ct_substs.borrow_mut() = old_cts;
123 /// Create a new "fake" [`DefId`].
125 /// This is an ugly hack, but it's the simplest way to handle synthetic impls without greatly
126 /// refactoring either rustdoc or [`rustc_middle`]. In particular, allowing new [`DefId`]s
127 /// to be registered after the AST is constructed would require storing the [`DefId`] mapping
128 /// in a [`RefCell`], decreasing the performance for normal compilation for very little gain.
130 /// Instead, we construct "fake" [`DefId`]s, which start immediately after the last `DefId`.
131 /// In the [`Debug`] impl for [`clean::Item`], we explicitly check for fake `DefId`s,
132 /// as we'll end up with a panic if we use the `DefId` `Debug` impl for fake `DefId`s.
134 /// [`RefCell`]: std::cell::RefCell
135 /// [`Debug`]: std::fmt::Debug
136 /// [`clean::Item`]: crate::clean::types::Item
137 crate fn next_def_id(&self, crate_num: CrateNum) -> DefId {
139 let num_def_ids = if crate_num == LOCAL_CRATE {
140 self.tcx.hir().definitions().def_path_table().num_def_ids()
142 self.enter_resolver(|r| r.cstore().num_def_ids(crate_num))
145 DefId { krate: crate_num, index: DefIndex::from_usize(num_def_ids) }
148 let mut fake_ids = self.fake_def_ids.borrow_mut();
150 let def_id = *fake_ids.entry(crate_num).or_insert(start_def_id);
153 DefId { krate: crate_num, index: DefIndex::from(def_id.index.index() + 1) },
156 MAX_DEF_ID.with(|m| {
157 m.borrow_mut().entry(def_id.krate).or_insert(start_def_id);
160 self.all_fake_def_ids.borrow_mut().insert(def_id);
165 /// Like `hir().local_def_id_to_hir_id()`, but skips calling it on fake DefIds.
166 /// (This avoids a slice-index-out-of-bounds panic.)
167 crate fn as_local_hir_id(&self, def_id: DefId) -> Option<HirId> {
168 if self.all_fake_def_ids.borrow().contains(&def_id) {
171 def_id.as_local().map(|def_id| self.tcx.hir().local_def_id_to_hir_id(def_id))
176 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
178 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
179 /// will be created for the handler.
180 crate fn new_handler(
181 error_format: ErrorOutputType,
182 source_map: Option<Lrc<source_map::SourceMap>>,
183 debugging_opts: &DebuggingOptions,
184 ) -> rustc_errors::Handler {
185 let emitter: Box<dyn Emitter + sync::Send> = match error_format {
186 ErrorOutputType::HumanReadable(kind) => {
187 let (short, color_config) = kind.unzip();
189 EmitterWriter::stderr(
191 source_map.map(|sm| sm as _),
193 debugging_opts.teach,
194 debugging_opts.terminal_width,
197 .ui_testing(debugging_opts.ui_testing),
200 ErrorOutputType::Json { pretty, json_rendered } => {
201 let source_map = source_map.unwrap_or_else(|| {
202 Lrc::new(source_map::SourceMap::new(source_map::FilePathMapping::empty()))
210 debugging_opts.terminal_width,
213 .ui_testing(debugging_opts.ui_testing),
218 rustc_errors::Handler::with_emitter_and_flags(
220 debugging_opts.diagnostic_handler_flags(true),
224 /// This function is used to setup the lint initialization. By default, in rustdoc, everything
225 /// is "allowed". Depending if we run in test mode or not, we want some of them to be at their
226 /// default level. For example, the "INVALID_CODEBLOCK_ATTRIBUTES" lint is activated in both
229 /// A little detail easy to forget is that there is a way to set the lint level for all lints
230 /// through the "WARNINGS" lint. To prevent this to happen, we set it back to its "normal" level
231 /// inside this function.
233 /// It returns a tuple containing:
234 /// * Vector of tuples of lints' name and their associated "max" level
235 /// * HashMap of lint id with their associated "max" level
236 pub(crate) fn init_lints<F>(
237 mut allowed_lints: Vec<String>,
238 lint_opts: Vec<(String, lint::Level)>,
240 ) -> (Vec<(String, lint::Level)>, FxHashMap<lint::LintId, lint::Level>)
242 F: Fn(&lint::Lint) -> Option<(String, lint::Level)>,
244 let warnings_lint_name = lint::builtin::WARNINGS.name;
246 allowed_lints.push(warnings_lint_name.to_owned());
247 allowed_lints.extend(lint_opts.iter().map(|(lint, _)| lint).cloned());
250 lint::builtin::HardwiredLints::get_lints()
252 .chain(rustc_lint::SoftLints::get_lints().into_iter())
255 let lint_opts = lints()
257 // Permit feature-gated lints to avoid feature errors when trying to
259 if lint.feature_gate.is_some() || allowed_lints.iter().any(|l| lint.name == l) {
265 .chain(lint_opts.into_iter())
266 .collect::<Vec<_>>();
268 let lint_caps = lints()
270 // We don't want to allow *all* lints so let's ignore
272 if allowed_lints.iter().any(|l| lint.name == l) {
275 Some((lint::LintId::of(lint), lint::Allow))
279 (lint_opts, lint_caps)
282 /// Parse, resolve, and typecheck the given crate.
283 crate fn create_config(
303 ) -> rustc_interface::Config {
304 // Add the doc cfg into the doc build.
305 cfgs.push("doc".to_string());
307 let cpath = Some(input.clone());
308 let input = Input::File(input);
310 let broken_intra_doc_links = lint::builtin::BROKEN_INTRA_DOC_LINKS.name;
311 let private_intra_doc_links = lint::builtin::PRIVATE_INTRA_DOC_LINKS.name;
312 let missing_docs = rustc_lint::builtin::MISSING_DOCS.name;
313 let missing_doc_example = rustc_lint::builtin::MISSING_DOC_CODE_EXAMPLES.name;
314 let private_doc_tests = rustc_lint::builtin::PRIVATE_DOC_TESTS.name;
315 let no_crate_level_docs = rustc_lint::builtin::MISSING_CRATE_LEVEL_DOCS.name;
316 let invalid_codeblock_attributes_name = rustc_lint::builtin::INVALID_CODEBLOCK_ATTRIBUTES.name;
317 let invalid_html_tags = rustc_lint::builtin::INVALID_HTML_TAGS.name;
318 let renamed_and_removed_lints = rustc_lint::builtin::RENAMED_AND_REMOVED_LINTS.name;
319 let non_autolinks = rustc_lint::builtin::NON_AUTOLINKS.name;
320 let unknown_lints = rustc_lint::builtin::UNKNOWN_LINTS.name;
322 // In addition to those specific lints, we also need to allow those given through
323 // command line, otherwise they'll get ignored and we don't want that.
324 let lints_to_show = vec![
325 broken_intra_doc_links.to_owned(),
326 private_intra_doc_links.to_owned(),
327 missing_docs.to_owned(),
328 missing_doc_example.to_owned(),
329 private_doc_tests.to_owned(),
330 no_crate_level_docs.to_owned(),
331 invalid_codeblock_attributes_name.to_owned(),
332 invalid_html_tags.to_owned(),
333 renamed_and_removed_lints.to_owned(),
334 unknown_lints.to_owned(),
335 non_autolinks.to_owned(),
338 let (lint_opts, lint_caps) = init_lints(lints_to_show, lint_opts, |lint| {
339 // FIXME: why is this necessary?
340 if lint.name == broken_intra_doc_links || lint.name == invalid_codeblock_attributes_name {
343 Some((lint.name_lower(), lint::Allow))
348 if proc_macro_crate { vec![CrateType::ProcMacro] } else { vec![CrateType::Rlib] };
349 // plays with error output here!
350 let sessopts = config::Options {
354 lint_opts: if !display_warnings { lint_opts } else { vec![] },
358 target_triple: target,
359 unstable_features: UnstableFeatures::from_environment(crate_name.as_deref()),
360 actually_rustdoc: true,
371 crate_cfg: interface::parse_cfgspecs(cfgs),
377 diagnostic_output: DiagnosticOutput::Default,
380 register_lints: None,
381 override_queries: Some(|_sess, providers, _external_providers| {
382 // Most lints will require typechecking, so just don't run them.
383 providers.lint_mod = |_, _| {};
384 // Prevent `rustc_typeck::check_crate` from calling `typeck` on all bodies.
385 providers.typeck_item_bodies = |_, _| {};
386 // hack so that `used_trait_imports` won't try to call typeck
387 providers.used_trait_imports = |_, _| {
389 static ref EMPTY_SET: FxHashSet<LocalDefId> = FxHashSet::default();
393 // In case typeck does end up being called, don't ICE in case there were name resolution errors
394 providers.typeck = move |tcx, def_id| {
395 // Closures' tables come from their outermost function,
396 // as they are part of the same "inference environment".
397 // This avoids emitting errors for the parent twice (see similar code in `typeck_with_fallback`)
398 let outer_def_id = tcx.closure_base_def_id(def_id.to_def_id()).expect_local();
399 if outer_def_id != def_id {
400 return tcx.typeck(outer_def_id);
404 let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(def_id)));
405 debug!("visiting body for {:?}", def_id);
406 EmitIgnoredResolutionErrors::new(tcx).visit_body(body);
407 (rustc_interface::DEFAULT_QUERY_PROVIDERS.typeck)(tcx, def_id)
410 make_codegen_backend: None,
411 registry: rustc_driver::diagnostics_registry(),
415 crate fn create_resolver<'a>(
416 externs: config::Externs,
417 queries: &Queries<'a>,
419 ) -> Rc<RefCell<interface::BoxedResolver>> {
420 let extern_names: Vec<String> = externs
422 .filter(|(_, entry)| entry.add_prelude)
423 .map(|(name, _)| name)
427 let parts = abort_on_err(queries.expansion(), sess).peek();
428 let resolver = parts.1.borrow();
430 // Before we actually clone it, let's force all the extern'd crates to
431 // actually be loaded, just in case they're only referred to inside
433 resolver.borrow_mut().access(|resolver| {
434 sess.time("load_extern_crates", || {
435 for extern_name in &extern_names {
436 debug!("loading extern crate {}", extern_name);
438 .resolve_str_path_error(
442 LocalDefId { local_def_index: CRATE_DEF_INDEX }.to_def_id(),
444 .unwrap_or_else(|()| {
445 panic!("Unable to resolve external crate {}", extern_name)
451 // Now we're good to clone the resolver because everything should be loaded
455 crate fn run_global_ctxt(
457 resolver: Rc<RefCell<interface::BoxedResolver>>,
458 mut default_passes: passes::DefaultPassOption,
459 mut manual_passes: Vec<String>,
460 render_options: RenderOptions,
461 output_format: Option<OutputFormat>,
462 ) -> (clean::Crate, RenderInfo, RenderOptions) {
463 // Certain queries assume that some checks were run elsewhere
464 // (see https://github.com/rust-lang/rust/pull/73566#issuecomment-656954425),
465 // so type-check everything other than function bodies in this crate before running lints.
467 // NOTE: this does not call `tcx.analysis()` so that we won't
468 // typeck function bodies or run the default rustc lints.
469 // (see `override_queries` in the `config`)
471 // HACK(jynelson) this calls an _extremely_ limited subset of `typeck`
472 // and might break if queries change their assumptions in the future.
474 // NOTE: This is copy/pasted from typeck/lib.rs and should be kept in sync with those changes.
475 tcx.sess.time("item_types_checking", || {
476 for &module in tcx.hir().krate().modules.keys() {
477 tcx.ensure().check_mod_item_types(tcx.hir().local_def_id(module));
480 tcx.sess.abort_if_errors();
481 tcx.sess.time("missing_docs", || {
482 rustc_lint::check_crate(tcx, rustc_lint::builtin::MissingDoc::new);
484 tcx.sess.time("check_mod_attrs", || {
485 for &module in tcx.hir().krate().modules.keys() {
486 let local_def_id = tcx.hir().local_def_id(module);
487 tcx.ensure().check_mod_attrs(local_def_id);
491 let access_levels = tcx.privacy_access_levels(LOCAL_CRATE);
492 // Convert from a HirId set to a DefId set since we don't always have easy access
493 // to the map from defid -> hirid
494 let access_levels = AccessLevels {
498 .map(|(&k, &v)| (tcx.hir().local_def_id(k).to_def_id(), v))
502 let mut renderinfo = RenderInfo::default();
503 renderinfo.access_levels = access_levels;
504 renderinfo.output_format = output_format;
506 let mut ctxt = DocContext {
509 param_env: Cell::new(ParamEnv::empty()),
510 external_traits: Default::default(),
511 active_extern_traits: Default::default(),
512 renderinfo: RefCell::new(renderinfo),
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 all_fake_def_ids: Default::default(),
519 generated_synthetics: Default::default(),
521 .all_traits(LOCAL_CRATE)
524 .filter(|trait_def_id| tcx.trait_is_auto(*trait_def_id))
527 module_trait_cache: RefCell::new(FxHashMap::default()),
529 debug!("crate: {:?}", tcx.hir().krate());
531 let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
533 if let Some(ref m) = krate.module {
534 if m.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
535 let help = "The following guide may be of use:\n\
536 https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html";
537 tcx.struct_lint_node(
538 rustc_lint::builtin::MISSING_CRATE_LEVEL_DOCS,
539 ctxt.as_local_hir_id(m.def_id).unwrap(),
542 lint.build("no documentation found for this crate's top-level module");
550 fn report_deprecated_attr(name: &str, diag: &rustc_errors::Handler) {
552 .struct_warn(&format!("the `#![doc({})]` attribute is considered deprecated", name));
554 "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
555 for more information",
558 if name == "no_default_passes" {
559 msg.help("you may want to use `#![doc(document_private_items)]`");
565 // Process all of the crate attributes, extracting plugin metadata along
566 // with the passes which we are supposed to run.
567 for attr in krate.module.as_ref().unwrap().attrs.lists(sym::doc) {
568 let diag = ctxt.sess().diagnostic();
570 let name = attr.name_or_empty();
572 if name == sym::no_default_passes {
573 report_deprecated_attr("no_default_passes", diag);
574 if default_passes == passes::DefaultPassOption::Default {
575 default_passes = passes::DefaultPassOption::None;
578 } else if let Some(value) = attr.value_str() {
579 let sink = match name {
581 report_deprecated_attr("passes = \"...\"", diag);
585 report_deprecated_attr("plugins = \"...\"", diag);
587 "WARNING: `#![doc(plugins = \"...\")]` \
588 no longer functions; see CVE-2018-1000622"
594 for name in value.as_str().split_whitespace() {
595 sink.push(name.to_string());
599 if attr.is_word() && name == sym::document_private_items {
600 ctxt.render_options.document_private = true;
604 let passes = passes::defaults(default_passes).iter().copied().chain(
605 manual_passes.into_iter().flat_map(|name| {
606 if let Some(pass) = passes::find_pass(&name) {
607 Some(ConditionalPass::always(pass))
609 error!("unknown pass {}, skipping", name);
615 info!("Executing passes");
618 let run = match p.condition {
620 WhenDocumentPrivate => ctxt.render_options.document_private,
621 WhenNotDocumentPrivate => !ctxt.render_options.document_private,
622 WhenNotDocumentHidden => !ctxt.render_options.document_hidden,
625 debug!("running pass {}", p.pass.name);
626 krate = ctxt.tcx.sess.time(p.pass.name, || (p.pass.run)(krate, &ctxt));
630 ctxt.sess().abort_if_errors();
632 // The main crate doc comments are always collapsed.
633 krate.collapsed = true;
635 (krate, ctxt.renderinfo.into_inner(), ctxt.render_options)
638 /// Due to <https://github.com/rust-lang/rust/pull/73566>,
639 /// the name resolution pass may find errors that are never emitted.
640 /// If typeck is called after this happens, then we'll get an ICE:
641 /// 'Res::Error found but not reported'. To avoid this, emit the errors now.
642 struct EmitIgnoredResolutionErrors<'tcx> {
646 impl<'tcx> EmitIgnoredResolutionErrors<'tcx> {
647 fn new(tcx: TyCtxt<'tcx>) -> Self {
652 impl<'tcx> Visitor<'tcx> for EmitIgnoredResolutionErrors<'tcx> {
653 type Map = Map<'tcx>;
655 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
656 // We need to recurse into nested closures,
657 // since those will fallback to the parent for type checking.
658 NestedVisitorMap::OnlyBodies(self.tcx.hir())
661 fn visit_path(&mut self, path: &'tcx Path<'_>, _id: HirId) {
662 debug!("visiting path {:?}", path);
663 if path.res == Res::Err {
664 // We have less context here than in rustc_resolve,
665 // so we can only emit the name and span.
666 // However we can give a hint that rustc_resolve will have more info.
668 "could not resolve path `{}`",
671 .map(|segment| segment.ident.as_str().to_string())
675 let mut err = rustc_errors::struct_span_err!(
679 "failed to resolve: {}",
682 err.span_label(path.span, label);
683 err.note("this error was originally ignored because you are running `rustdoc`");
684 err.note("try running again with `rustc` or `cargo check` and you may get a more detailed error");
687 // We could have an outer resolution that succeeded,
688 // but with generic parameters that failed.
689 // Recurse into the segments so we catch those too.
690 intravisit::walk_path(self, path);
694 /// `DefId` or parameter index (`ty::ParamTy.index`) of a synthetic type parameter
695 /// for `impl Trait` in argument position.
696 #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
697 crate enum ImplTraitParam {
702 impl From<DefId> for ImplTraitParam {
703 fn from(did: DefId) -> Self {
704 ImplTraitParam::DefId(did)
708 impl From<u32> for ImplTraitParam {
709 fn from(idx: u32) -> Self {
710 ImplTraitParam::ParamIndex(idx)