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;
8 use rustc_hir::def::Res;
9 use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_INDEX};
12 intravisit::{self, NestedVisitorMap, Visitor},
15 use rustc_interface::{interface, Queries};
16 use rustc_middle::hir::map::Map;
17 use rustc_middle::middle::privacy::AccessLevels;
18 use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
19 use rustc_resolve as resolve;
20 use rustc_session::config::{self, CrateType, ErrorOutputType};
21 use rustc_session::lint;
22 use rustc_session::DiagnosticOutput;
23 use rustc_session::Session;
24 use rustc_span::source_map;
25 use rustc_span::symbol::sym;
26 use rustc_span::{Span, DUMMY_SP};
28 use std::cell::RefCell;
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 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 /// 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: 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: FxHashMap<DefId, FxHashSet<DefId>>,
78 /// This same cache is used throughout rustdoc, including in [`crate::html::render`].
80 /// Used by [`clean::inline`] to tell if an item has already been inlined.
81 crate inlined: FxHashSet<ItemId>,
82 /// Used by `calculate_doc_coverage`.
83 crate output_format: OutputFormat,
86 impl<'tcx> DocContext<'tcx> {
87 crate fn sess(&self) -> &'tcx Session {
91 crate fn with_param_env<T, F: FnOnce(&mut Self) -> T>(&mut self, def_id: DefId, f: F) -> T {
92 let old_param_env = mem::replace(&mut self.param_env, self.tcx.param_env(def_id));
94 self.param_env = old_param_env;
98 crate fn enter_resolver<F, R>(&self, f: F) -> R
100 F: FnOnce(&mut resolve::Resolver<'_>) -> R,
102 self.resolver.borrow_mut().access(f)
105 /// Call the closure with the given parameters set as
106 /// the substitutions for a type alias' RHS.
107 crate fn enter_alias<F, R>(
109 ty_substs: FxHashMap<DefId, clean::Type>,
110 lt_substs: FxHashMap<DefId, clean::Lifetime>,
111 ct_substs: FxHashMap<DefId, clean::Constant>,
115 F: FnOnce(&mut Self) -> R,
117 let (old_tys, old_lts, old_cts) = (
118 mem::replace(&mut self.ty_substs, ty_substs),
119 mem::replace(&mut self.lt_substs, lt_substs),
120 mem::replace(&mut self.ct_substs, ct_substs),
123 self.ty_substs = old_tys;
124 self.lt_substs = old_lts;
125 self.ct_substs = old_cts;
129 /// Like `hir().local_def_id_to_hir_id()`, but skips calling it on fake DefIds.
130 /// (This avoids a slice-index-out-of-bounds panic.)
131 crate fn as_local_hir_id(tcx: TyCtxt<'_>, def_id: ItemId) -> Option<HirId> {
133 ItemId::DefId(real_id) => {
134 real_id.as_local().map(|def_id| tcx.hir().local_def_id_to_hir_id(def_id))
136 // FIXME: Can this be `Some` for `Auto` or `Blanket`?
142 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
144 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
145 /// will be created for the handler.
146 crate fn new_handler(
147 error_format: ErrorOutputType,
148 source_map: Option<Lrc<source_map::SourceMap>>,
149 debugging_opts: &DebuggingOptions,
150 ) -> rustc_errors::Handler {
151 let emitter: Box<dyn Emitter + sync::Send> = match error_format {
152 ErrorOutputType::HumanReadable(kind) => {
153 let (short, color_config) = kind.unzip();
155 EmitterWriter::stderr(
157 source_map.map(|sm| sm as _),
159 debugging_opts.teach,
160 debugging_opts.terminal_width,
163 .ui_testing(debugging_opts.ui_testing),
166 ErrorOutputType::Json { pretty, json_rendered } => {
167 let source_map = source_map.unwrap_or_else(|| {
168 Lrc::new(source_map::SourceMap::new(source_map::FilePathMapping::empty()))
176 debugging_opts.terminal_width,
179 .ui_testing(debugging_opts.ui_testing),
184 rustc_errors::Handler::with_emitter_and_flags(
186 debugging_opts.diagnostic_handler_flags(true),
190 /// Parse, resolve, and typecheck the given crate.
191 crate fn create_config(
211 ) -> rustc_interface::Config {
212 // Add the doc cfg into the doc build.
213 cfgs.push("doc".to_string());
215 let cpath = Some(input.clone());
216 let input = Input::File(input);
218 // By default, rustdoc ignores all lints.
219 // Specifically unblock lints relevant to documentation or the lint machinery itself.
220 let mut lints_to_show = vec![
221 // it's unclear whether these should be part of rustdoc directly (#77364)
222 rustc_lint::builtin::MISSING_DOCS.name.to_string(),
223 rustc_lint::builtin::INVALID_DOC_ATTRIBUTES.name.to_string(),
224 // these are definitely not part of rustdoc, but we want to warn on them anyway.
225 rustc_lint::builtin::RENAMED_AND_REMOVED_LINTS.name.to_string(),
226 rustc_lint::builtin::UNKNOWN_LINTS.name.to_string(),
228 lints_to_show.extend(crate::lint::RUSTDOC_LINTS.iter().map(|lint| lint.name.to_string()));
230 let (lint_opts, lint_caps) = crate::lint::init_lints(lints_to_show, lint_opts, |lint| {
231 Some((lint.name_lower(), lint::Allow))
235 if proc_macro_crate { vec![CrateType::ProcMacro] } else { vec![CrateType::Rlib] };
236 // plays with error output here!
237 let sessopts = config::Options {
241 lint_opts: if !display_warnings { lint_opts } else { vec![] },
245 target_triple: target,
246 unstable_features: UnstableFeatures::from_environment(crate_name.as_deref()),
247 actually_rustdoc: true,
258 crate_cfg: interface::parse_cfgspecs(cfgs),
264 diagnostic_output: DiagnosticOutput::Default,
267 parse_sess_created: None,
268 register_lints: Some(box crate::lint::register_lints),
269 override_queries: Some(|_sess, providers, _external_providers| {
270 // Most lints will require typechecking, so just don't run them.
271 providers.lint_mod = |_, _| {};
272 // Prevent `rustc_typeck::check_crate` from calling `typeck` on all bodies.
273 providers.typeck_item_bodies = |_, _| {};
274 // hack so that `used_trait_imports` won't try to call typeck
275 providers.used_trait_imports = |_, _| {
277 static ref EMPTY_SET: FxHashSet<LocalDefId> = FxHashSet::default();
281 // In case typeck does end up being called, don't ICE in case there were name resolution errors
282 providers.typeck = move |tcx, def_id| {
283 // Closures' tables come from their outermost function,
284 // as they are part of the same "inference environment".
285 // This avoids emitting errors for the parent twice (see similar code in `typeck_with_fallback`)
286 let outer_def_id = tcx.closure_base_def_id(def_id.to_def_id()).expect_local();
287 if outer_def_id != def_id {
288 return tcx.typeck(outer_def_id);
292 let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(def_id)));
293 debug!("visiting body for {:?}", def_id);
294 EmitIgnoredResolutionErrors::new(tcx).visit_body(body);
295 (rustc_interface::DEFAULT_QUERY_PROVIDERS.typeck)(tcx, def_id)
298 make_codegen_backend: None,
299 registry: rustc_driver::diagnostics_registry(),
303 crate fn create_resolver<'a>(
304 externs: config::Externs,
305 queries: &Queries<'a>,
307 ) -> Rc<RefCell<interface::BoxedResolver>> {
308 let extern_names: Vec<String> = externs
310 .filter(|(_, entry)| entry.add_prelude)
311 .map(|(name, _)| name)
315 let (_, resolver, _) = &*abort_on_err(queries.expansion(), sess).peek();
317 // Before we actually clone it, let's force all the extern'd crates to
318 // actually be loaded, just in case they're only referred to inside
320 resolver.borrow_mut().access(|resolver| {
321 sess.time("load_extern_crates", || {
322 for extern_name in &extern_names {
323 debug!("loading extern crate {}", extern_name);
324 if let Err(()) = resolver
325 .resolve_str_path_error(
329 LocalDefId { local_def_index: CRATE_DEF_INDEX }.to_def_id(),
331 warn!("unable to resolve external crate {} (do you have an unused `--extern` crate?)", extern_name)
337 // Now we're good to clone the resolver because everything should be loaded
341 crate fn run_global_ctxt(
343 resolver: Rc<RefCell<interface::BoxedResolver>>,
344 mut default_passes: passes::DefaultPassOption,
345 manual_passes: Vec<String>,
346 render_options: RenderOptions,
347 output_format: OutputFormat,
348 ) -> (clean::Crate, RenderOptions, Cache) {
349 // Certain queries assume that some checks were run elsewhere
350 // (see https://github.com/rust-lang/rust/pull/73566#issuecomment-656954425),
351 // so type-check everything other than function bodies in this crate before running lints.
353 // NOTE: this does not call `tcx.analysis()` so that we won't
354 // typeck function bodies or run the default rustc lints.
355 // (see `override_queries` in the `config`)
357 // HACK(jynelson) this calls an _extremely_ limited subset of `typeck`
358 // and might break if queries change their assumptions in the future.
360 // NOTE: This is copy/pasted from typeck/lib.rs and should be kept in sync with those changes.
361 tcx.sess.time("item_types_checking", || {
362 for &module in tcx.hir().krate().modules.keys() {
363 tcx.ensure().check_mod_item_types(module);
366 tcx.sess.abort_if_errors();
367 tcx.sess.time("missing_docs", || {
368 rustc_lint::check_crate(tcx, rustc_lint::builtin::MissingDoc::new);
370 tcx.sess.time("check_mod_attrs", || {
371 for &module in tcx.hir().krate().modules.keys() {
372 tcx.ensure().check_mod_attrs(module);
375 rustc_passes::stability::check_unused_or_stable_features(tcx);
377 let access_levels = tcx.privacy_access_levels(());
378 // Convert from a HirId set to a DefId set since we don't always have easy access
379 // to the map from defid -> hirid
380 let access_levels = AccessLevels {
384 .map(|(&k, &v)| (tcx.hir().local_def_id(k).to_def_id(), v))
388 let mut ctxt = DocContext {
391 param_env: ParamEnv::empty(),
392 external_traits: Default::default(),
393 active_extern_traits: Default::default(),
394 ty_substs: Default::default(),
395 lt_substs: Default::default(),
396 ct_substs: Default::default(),
397 impl_trait_bounds: Default::default(),
398 generated_synthetics: Default::default(),
403 .filter(|trait_def_id| tcx.trait_is_auto(*trait_def_id))
405 module_trait_cache: FxHashMap::default(),
406 cache: Cache::new(access_levels, render_options.document_private),
407 inlined: FxHashSet::default(),
412 // Small hack to force the Sized trait to be present.
414 // Note that in case of `#![no_core]`, the trait is not available.
415 if let Some(sized_trait_did) = ctxt.tcx.lang_items().sized_trait() {
416 let mut sized_trait = build_external_trait(&mut ctxt, sized_trait_did);
417 sized_trait.is_auto = true;
420 .insert(sized_trait_did, TraitWithExtraInfo { trait_: sized_trait, is_notable: false });
423 debug!("crate: {:?}", tcx.hir().krate());
425 let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
427 if krate.module.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
429 "The following guide may be of use:\n\
430 {}/rustdoc/how-to-write-documentation.html",
431 crate::DOC_RUST_LANG_ORG_CHANNEL
433 tcx.struct_lint_node(
434 crate::lint::MISSING_CRATE_LEVEL_DOCS,
435 DocContext::as_local_hir_id(tcx, krate.module.def_id).unwrap(),
438 lint.build("no documentation found for this crate's top-level module");
445 fn report_deprecated_attr(name: &str, diag: &rustc_errors::Handler, sp: Span) {
447 diag.struct_span_warn(sp, &format!("the `#![doc({})]` attribute is deprecated", name));
449 "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
450 for more information",
453 if name == "no_default_passes" {
454 msg.help("you may want to use `#![doc(document_private_items)]`");
455 } else if name.starts_with("plugins") {
456 msg.warn("`#![doc(plugins = \"...\")]` no longer functions; see CVE-2018-1000622 <https://nvd.nist.gov/vuln/detail/CVE-2018-1000622>");
462 let parse_pass = |name: &str, sp: Option<Span>| {
463 if let Some(pass) = passes::find_pass(name) {
464 Some(ConditionalPass::always(pass))
466 let msg = &format!("ignoring unknown pass `{}`", name);
467 let mut warning = if let Some(sp) = sp {
468 tcx.sess.struct_span_warn(sp, msg)
470 tcx.sess.struct_warn(msg)
472 if name == "collapse-docs" {
473 warning.note("the `collapse-docs` pass was removed in #80261 <https://github.com/rust-lang/rust/pull/80261>");
480 let mut manual_passes: Vec<_> =
481 manual_passes.into_iter().flat_map(|name| parse_pass(&name, None)).collect();
483 // Process all of the crate attributes, extracting plugin metadata along
484 // with the passes which we are supposed to run.
485 for attr in krate.module.attrs.lists(sym::doc) {
486 let diag = ctxt.sess().diagnostic();
488 let name = attr.name_or_empty();
490 if name == sym::no_default_passes {
491 report_deprecated_attr("no_default_passes", diag, attr.span());
492 if default_passes == passes::DefaultPassOption::Default {
493 default_passes = passes::DefaultPassOption::None;
496 } else if let Some(value) = attr.value_str() {
499 report_deprecated_attr("passes = \"...\"", diag, attr.span());
502 report_deprecated_attr("plugins = \"...\"", diag, attr.span());
507 for name in value.as_str().split_whitespace() {
508 let span = attr.name_value_literal_span().unwrap_or(attr.span());
509 manual_passes.extend(parse_pass(name, Some(span)));
513 if attr.is_word() && name == sym::document_private_items {
514 ctxt.render_options.document_private = true;
518 let passes = passes::defaults(default_passes).iter().copied().chain(manual_passes);
519 info!("Executing passes");
522 let run = match p.condition {
524 WhenDocumentPrivate => ctxt.render_options.document_private,
525 WhenNotDocumentPrivate => !ctxt.render_options.document_private,
526 WhenNotDocumentHidden => !ctxt.render_options.document_hidden,
529 debug!("running pass {}", p.pass.name);
530 krate = ctxt.tcx.sess.time(p.pass.name, || (p.pass.run)(krate, &mut ctxt));
534 ctxt.sess().abort_if_errors();
536 let render_options = ctxt.render_options;
537 let mut cache = ctxt.cache;
538 krate = tcx.sess.time("create_format_cache", || {
539 cache.populate(krate, tcx, &render_options.extern_html_root_urls, &render_options.output)
542 // The main crate doc comments are always collapsed.
543 krate.collapsed = true;
545 (krate, render_options, cache)
548 /// Due to <https://github.com/rust-lang/rust/pull/73566>,
549 /// the name resolution pass may find errors that are never emitted.
550 /// If typeck is called after this happens, then we'll get an ICE:
551 /// 'Res::Error found but not reported'. To avoid this, emit the errors now.
552 struct EmitIgnoredResolutionErrors<'tcx> {
556 impl<'tcx> EmitIgnoredResolutionErrors<'tcx> {
557 fn new(tcx: TyCtxt<'tcx>) -> Self {
562 impl<'tcx> Visitor<'tcx> for EmitIgnoredResolutionErrors<'tcx> {
563 type Map = Map<'tcx>;
565 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
566 // We need to recurse into nested closures,
567 // since those will fallback to the parent for type checking.
568 NestedVisitorMap::OnlyBodies(self.tcx.hir())
571 fn visit_path(&mut self, path: &'tcx Path<'_>, _id: HirId) {
572 debug!("visiting path {:?}", path);
573 if path.res == Res::Err {
574 // We have less context here than in rustc_resolve,
575 // so we can only emit the name and span.
576 // However we can give a hint that rustc_resolve will have more info.
578 "could not resolve path `{}`",
581 .map(|segment| segment.ident.as_str().to_string())
585 let mut err = rustc_errors::struct_span_err!(
589 "failed to resolve: {}",
592 err.span_label(path.span, label);
593 err.note("this error was originally ignored because you are running `rustdoc`");
594 err.note("try running again with `rustc` or `cargo check` and you may get a more detailed error");
597 // We could have an outer resolution that succeeded,
598 // but with generic parameters that failed.
599 // Recurse into the segments so we catch those too.
600 intravisit::walk_path(self, path);
604 /// `DefId` or parameter index (`ty::ParamTy.index`) of a synthetic type parameter
605 /// for `impl Trait` in argument position.
606 #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
607 crate enum ImplTraitParam {
612 impl From<DefId> for ImplTraitParam {
613 fn from(did: DefId) -> Self {
614 ImplTraitParam::DefId(did)
618 impl From<u32> for ImplTraitParam {
619 fn from(idx: u32) -> Self {
620 ImplTraitParam::ParamIndex(idx)