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::formats::cache::Cache;
36 use crate::passes::{self, Condition::*, ConditionalPass};
38 crate use rustc_session::config::{DebuggingOptions, Input, Options};
40 crate type ExternalPaths = FxHashMap<DefId, (Vec<String>, clean::TypeKind)>;
42 crate struct DocContext<'tcx> {
43 crate tcx: TyCtxt<'tcx>,
44 crate resolver: Rc<RefCell<interface::BoxedResolver>>,
45 /// Used for normalization.
47 /// Most of this logic is copied from rustc_lint::late.
48 crate param_env: Cell<ParamEnv<'tcx>>,
49 /// Later on moved into `cache`
50 crate renderinfo: RefCell<RenderInfo>,
51 /// Later on moved through `clean::Crate` into `cache`
52 crate external_traits: Rc<RefCell<FxHashMap<DefId, clean::Trait>>>,
53 /// Used while populating `external_traits` to ensure we don't process the same trait twice at
55 crate active_extern_traits: RefCell<FxHashSet<DefId>>,
56 // The current set of type and lifetime substitutions,
57 // for expanding type aliases at the HIR level:
58 /// Table `DefId` of type parameter -> substituted type
59 crate ty_substs: RefCell<FxHashMap<DefId, clean::Type>>,
60 /// Table `DefId` of lifetime parameter -> substituted lifetime
61 crate lt_substs: RefCell<FxHashMap<DefId, clean::Lifetime>>,
62 /// Table `DefId` of const parameter -> substituted const
63 crate ct_substs: RefCell<FxHashMap<DefId, clean::Constant>>,
64 /// Table synthetic type parameter for `impl Trait` in argument position -> bounds
65 crate impl_trait_bounds: RefCell<FxHashMap<ImplTraitParam, Vec<clean::GenericBound>>>,
66 crate fake_def_ids: RefCell<FxHashMap<CrateNum, DefId>>,
67 crate all_fake_def_ids: RefCell<FxHashSet<DefId>>,
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: RefCell<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 /// Fake empty cache used when cache is required as parameter.
83 impl<'tcx> DocContext<'tcx> {
84 crate fn sess(&self) -> &Session {
88 crate fn with_param_env<T, F: FnOnce() -> T>(&self, def_id: DefId, f: F) -> T {
89 let old_param_env = self.param_env.replace(self.tcx.param_env(def_id));
91 self.param_env.set(old_param_env);
95 crate fn enter_resolver<F, R>(&self, f: F) -> R
97 F: FnOnce(&mut resolve::Resolver<'_>) -> R,
99 self.resolver.borrow_mut().access(f)
102 /// Call the closure with the given parameters set as
103 /// the substitutions for a type alias' RHS.
104 crate fn enter_alias<F, R>(
106 ty_substs: FxHashMap<DefId, clean::Type>,
107 lt_substs: FxHashMap<DefId, clean::Lifetime>,
108 ct_substs: FxHashMap<DefId, clean::Constant>,
114 let (old_tys, old_lts, old_cts) = (
115 mem::replace(&mut *self.ty_substs.borrow_mut(), ty_substs),
116 mem::replace(&mut *self.lt_substs.borrow_mut(), lt_substs),
117 mem::replace(&mut *self.ct_substs.borrow_mut(), ct_substs),
120 *self.ty_substs.borrow_mut() = old_tys;
121 *self.lt_substs.borrow_mut() = old_lts;
122 *self.ct_substs.borrow_mut() = old_cts;
126 /// Create a new "fake" [`DefId`].
128 /// This is an ugly hack, but it's the simplest way to handle synthetic impls without greatly
129 /// refactoring either rustdoc or [`rustc_middle`]. In particular, allowing new [`DefId`]s
130 /// to be registered after the AST is constructed would require storing the [`DefId`] mapping
131 /// in a [`RefCell`], decreasing the performance for normal compilation for very little gain.
133 /// Instead, we construct "fake" [`DefId`]s, which start immediately after the last `DefId`.
134 /// In the [`Debug`] impl for [`clean::Item`], we explicitly check for fake `DefId`s,
135 /// as we'll end up with a panic if we use the `DefId` `Debug` impl for fake `DefId`s.
137 /// [`RefCell`]: std::cell::RefCell
138 /// [`Debug`]: std::fmt::Debug
139 /// [`clean::Item`]: crate::clean::types::Item
140 crate fn next_def_id(&self, crate_num: CrateNum) -> DefId {
142 let num_def_ids = if crate_num == LOCAL_CRATE {
143 self.tcx.hir().definitions().def_path_table().num_def_ids()
145 self.enter_resolver(|r| r.cstore().num_def_ids(crate_num))
148 DefId { krate: crate_num, index: DefIndex::from_usize(num_def_ids) }
151 let mut fake_ids = self.fake_def_ids.borrow_mut();
153 let def_id = *fake_ids.entry(crate_num).or_insert(start_def_id);
156 DefId { krate: crate_num, index: DefIndex::from(def_id.index.index() + 1) },
159 MAX_DEF_ID.with(|m| {
160 m.borrow_mut().entry(def_id.krate).or_insert(start_def_id);
163 self.all_fake_def_ids.borrow_mut().insert(def_id);
168 /// Like `hir().local_def_id_to_hir_id()`, but skips calling it on fake DefIds.
169 /// (This avoids a slice-index-out-of-bounds panic.)
170 crate fn as_local_hir_id(&self, def_id: DefId) -> Option<HirId> {
171 if self.all_fake_def_ids.borrow().contains(&def_id) {
174 def_id.as_local().map(|def_id| self.tcx.hir().local_def_id_to_hir_id(def_id))
179 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
181 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
182 /// will be created for the handler.
183 crate fn new_handler(
184 error_format: ErrorOutputType,
185 source_map: Option<Lrc<source_map::SourceMap>>,
186 debugging_opts: &DebuggingOptions,
187 ) -> rustc_errors::Handler {
188 let emitter: Box<dyn Emitter + sync::Send> = match error_format {
189 ErrorOutputType::HumanReadable(kind) => {
190 let (short, color_config) = kind.unzip();
192 EmitterWriter::stderr(
194 source_map.map(|sm| sm as _),
196 debugging_opts.teach,
197 debugging_opts.terminal_width,
200 .ui_testing(debugging_opts.ui_testing),
203 ErrorOutputType::Json { pretty, json_rendered } => {
204 let source_map = source_map.unwrap_or_else(|| {
205 Lrc::new(source_map::SourceMap::new(source_map::FilePathMapping::empty()))
213 debugging_opts.terminal_width,
216 .ui_testing(debugging_opts.ui_testing),
221 rustc_errors::Handler::with_emitter_and_flags(
223 debugging_opts.diagnostic_handler_flags(true),
227 /// This function is used to setup the lint initialization. By default, in rustdoc, everything
228 /// is "allowed". Depending if we run in test mode or not, we want some of them to be at their
229 /// default level. For example, the "INVALID_CODEBLOCK_ATTRIBUTES" lint is activated in both
232 /// A little detail easy to forget is that there is a way to set the lint level for all lints
233 /// through the "WARNINGS" lint. To prevent this to happen, we set it back to its "normal" level
234 /// inside this function.
236 /// It returns a tuple containing:
237 /// * Vector of tuples of lints' name and their associated "max" level
238 /// * HashMap of lint id with their associated "max" level
239 pub(crate) fn init_lints<F>(
240 mut allowed_lints: Vec<String>,
241 lint_opts: Vec<(String, lint::Level)>,
243 ) -> (Vec<(String, lint::Level)>, FxHashMap<lint::LintId, lint::Level>)
245 F: Fn(&lint::Lint) -> Option<(String, lint::Level)>,
247 let warnings_lint_name = lint::builtin::WARNINGS.name;
249 allowed_lints.push(warnings_lint_name.to_owned());
250 allowed_lints.extend(lint_opts.iter().map(|(lint, _)| lint).cloned());
253 lint::builtin::HardwiredLints::get_lints()
255 .chain(rustc_lint::SoftLints::get_lints().into_iter())
258 let lint_opts = lints()
260 // Permit feature-gated lints to avoid feature errors when trying to
262 if lint.feature_gate.is_some() || allowed_lints.iter().any(|l| lint.name == l) {
268 .chain(lint_opts.into_iter())
269 .collect::<Vec<_>>();
271 let lint_caps = lints()
273 // We don't want to allow *all* lints so let's ignore
275 if allowed_lints.iter().any(|l| lint.name == l) {
278 Some((lint::LintId::of(lint), lint::Allow))
282 (lint_opts, lint_caps)
285 /// Parse, resolve, and typecheck the given crate.
286 crate fn create_config(
306 ) -> rustc_interface::Config {
307 // Add the doc cfg into the doc build.
308 cfgs.push("doc".to_string());
310 let cpath = Some(input.clone());
311 let input = Input::File(input);
313 let broken_intra_doc_links = lint::builtin::BROKEN_INTRA_DOC_LINKS.name;
314 let private_intra_doc_links = lint::builtin::PRIVATE_INTRA_DOC_LINKS.name;
315 let missing_docs = rustc_lint::builtin::MISSING_DOCS.name;
316 let missing_doc_example = rustc_lint::builtin::MISSING_DOC_CODE_EXAMPLES.name;
317 let private_doc_tests = rustc_lint::builtin::PRIVATE_DOC_TESTS.name;
318 let no_crate_level_docs = rustc_lint::builtin::MISSING_CRATE_LEVEL_DOCS.name;
319 let invalid_codeblock_attributes_name = rustc_lint::builtin::INVALID_CODEBLOCK_ATTRIBUTES.name;
320 let invalid_html_tags = rustc_lint::builtin::INVALID_HTML_TAGS.name;
321 let renamed_and_removed_lints = rustc_lint::builtin::RENAMED_AND_REMOVED_LINTS.name;
322 let non_autolinks = rustc_lint::builtin::NON_AUTOLINKS.name;
323 let unknown_lints = rustc_lint::builtin::UNKNOWN_LINTS.name;
325 // In addition to those specific lints, we also need to allow those given through
326 // command line, otherwise they'll get ignored and we don't want that.
327 let lints_to_show = vec![
328 broken_intra_doc_links.to_owned(),
329 private_intra_doc_links.to_owned(),
330 missing_docs.to_owned(),
331 missing_doc_example.to_owned(),
332 private_doc_tests.to_owned(),
333 no_crate_level_docs.to_owned(),
334 invalid_codeblock_attributes_name.to_owned(),
335 invalid_html_tags.to_owned(),
336 renamed_and_removed_lints.to_owned(),
337 unknown_lints.to_owned(),
338 non_autolinks.to_owned(),
341 let (lint_opts, lint_caps) = init_lints(lints_to_show, lint_opts, |lint| {
342 // FIXME: why is this necessary?
343 if lint.name == broken_intra_doc_links || lint.name == invalid_codeblock_attributes_name {
346 Some((lint.name_lower(), lint::Allow))
351 if proc_macro_crate { vec![CrateType::ProcMacro] } else { vec![CrateType::Rlib] };
352 // plays with error output here!
353 let sessopts = config::Options {
357 lint_opts: if !display_warnings { lint_opts } else { vec![] },
361 target_triple: target,
362 unstable_features: UnstableFeatures::from_environment(crate_name.as_deref()),
363 actually_rustdoc: true,
374 crate_cfg: interface::parse_cfgspecs(cfgs),
380 diagnostic_output: DiagnosticOutput::Default,
383 register_lints: None,
384 override_queries: Some(|_sess, providers, _external_providers| {
385 // Most lints will require typechecking, so just don't run them.
386 providers.lint_mod = |_, _| {};
387 // Prevent `rustc_typeck::check_crate` from calling `typeck` on all bodies.
388 providers.typeck_item_bodies = |_, _| {};
389 // hack so that `used_trait_imports` won't try to call typeck
390 providers.used_trait_imports = |_, _| {
392 static ref EMPTY_SET: FxHashSet<LocalDefId> = FxHashSet::default();
396 // In case typeck does end up being called, don't ICE in case there were name resolution errors
397 providers.typeck = move |tcx, def_id| {
398 // Closures' tables come from their outermost function,
399 // as they are part of the same "inference environment".
400 // This avoids emitting errors for the parent twice (see similar code in `typeck_with_fallback`)
401 let outer_def_id = tcx.closure_base_def_id(def_id.to_def_id()).expect_local();
402 if outer_def_id != def_id {
403 return tcx.typeck(outer_def_id);
407 let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(def_id)));
408 debug!("visiting body for {:?}", def_id);
409 EmitIgnoredResolutionErrors::new(tcx).visit_body(body);
410 (rustc_interface::DEFAULT_QUERY_PROVIDERS.typeck)(tcx, def_id)
413 make_codegen_backend: None,
414 registry: rustc_driver::diagnostics_registry(),
418 crate fn create_resolver<'a>(
419 externs: config::Externs,
420 queries: &Queries<'a>,
422 ) -> Rc<RefCell<interface::BoxedResolver>> {
423 let extern_names: Vec<String> = externs
425 .filter(|(_, entry)| entry.add_prelude)
426 .map(|(name, _)| name)
430 let parts = abort_on_err(queries.expansion(), sess).peek();
431 let resolver = parts.1.borrow();
433 // Before we actually clone it, let's force all the extern'd crates to
434 // actually be loaded, just in case they're only referred to inside
436 resolver.borrow_mut().access(|resolver| {
437 sess.time("load_extern_crates", || {
438 for extern_name in &extern_names {
439 debug!("loading extern crate {}", extern_name);
440 if let Err(()) = resolver
441 .resolve_str_path_error(
445 LocalDefId { local_def_index: CRATE_DEF_INDEX }.to_def_id(),
447 warn!("unable to resolve external crate {} (do you have an unused `--extern` crate?)", extern_name)
453 // Now we're good to clone the resolver because everything should be loaded
457 crate fn run_global_ctxt(
459 resolver: Rc<RefCell<interface::BoxedResolver>>,
460 mut default_passes: passes::DefaultPassOption,
461 mut manual_passes: Vec<String>,
462 render_options: RenderOptions,
463 output_format: Option<OutputFormat>,
464 ) -> (clean::Crate, RenderInfo, RenderOptions) {
465 // Certain queries assume that some checks were run elsewhere
466 // (see https://github.com/rust-lang/rust/pull/73566#issuecomment-656954425),
467 // so type-check everything other than function bodies in this crate before running lints.
469 // NOTE: this does not call `tcx.analysis()` so that we won't
470 // typeck function bodies or run the default rustc lints.
471 // (see `override_queries` in the `config`)
473 // HACK(jynelson) this calls an _extremely_ limited subset of `typeck`
474 // and might break if queries change their assumptions in the future.
476 // NOTE: This is copy/pasted from typeck/lib.rs and should be kept in sync with those changes.
477 tcx.sess.time("item_types_checking", || {
478 for &module in tcx.hir().krate().modules.keys() {
479 tcx.ensure().check_mod_item_types(tcx.hir().local_def_id(module));
482 tcx.sess.abort_if_errors();
483 tcx.sess.time("missing_docs", || {
484 rustc_lint::check_crate(tcx, rustc_lint::builtin::MissingDoc::new);
486 tcx.sess.time("check_mod_attrs", || {
487 for &module in tcx.hir().krate().modules.keys() {
488 let local_def_id = tcx.hir().local_def_id(module);
489 tcx.ensure().check_mod_attrs(local_def_id);
493 let access_levels = tcx.privacy_access_levels(LOCAL_CRATE);
494 // Convert from a HirId set to a DefId set since we don't always have easy access
495 // to the map from defid -> hirid
496 let access_levels = AccessLevels {
500 .map(|(&k, &v)| (tcx.hir().local_def_id(k).to_def_id(), v))
504 let mut renderinfo = RenderInfo::default();
505 renderinfo.access_levels = access_levels;
506 renderinfo.output_format = output_format;
508 let mut ctxt = DocContext {
511 param_env: Cell::new(ParamEnv::empty()),
512 external_traits: Default::default(),
513 active_extern_traits: Default::default(),
514 renderinfo: RefCell::new(renderinfo),
515 ty_substs: Default::default(),
516 lt_substs: Default::default(),
517 ct_substs: Default::default(),
518 impl_trait_bounds: Default::default(),
519 fake_def_ids: Default::default(),
520 all_fake_def_ids: Default::default(),
521 generated_synthetics: Default::default(),
523 .all_traits(LOCAL_CRATE)
526 .filter(|trait_def_id| tcx.trait_is_auto(*trait_def_id))
529 module_trait_cache: RefCell::new(FxHashMap::default()),
530 cache: Cache::default(),
532 debug!("crate: {:?}", tcx.hir().krate());
534 let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
536 if let Some(ref m) = krate.module {
537 if m.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
538 let help = "The following guide may be of use:\n\
539 https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html";
540 tcx.struct_lint_node(
541 rustc_lint::builtin::MISSING_CRATE_LEVEL_DOCS,
542 ctxt.as_local_hir_id(m.def_id).unwrap(),
545 lint.build("no documentation found for this crate's top-level module");
553 fn report_deprecated_attr(name: &str, diag: &rustc_errors::Handler) {
555 .struct_warn(&format!("the `#![doc({})]` attribute is considered deprecated", name));
557 "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
558 for more information",
561 if name == "no_default_passes" {
562 msg.help("you may want to use `#![doc(document_private_items)]`");
568 // Process all of the crate attributes, extracting plugin metadata along
569 // with the passes which we are supposed to run.
570 for attr in krate.module.as_ref().unwrap().attrs.lists(sym::doc) {
571 let diag = ctxt.sess().diagnostic();
573 let name = attr.name_or_empty();
575 if name == sym::no_default_passes {
576 report_deprecated_attr("no_default_passes", diag);
577 if default_passes == passes::DefaultPassOption::Default {
578 default_passes = passes::DefaultPassOption::None;
581 } else if let Some(value) = attr.value_str() {
582 let sink = match name {
584 report_deprecated_attr("passes = \"...\"", diag);
588 report_deprecated_attr("plugins = \"...\"", diag);
590 "WARNING: `#![doc(plugins = \"...\")]` \
591 no longer functions; see CVE-2018-1000622"
597 for name in value.as_str().split_whitespace() {
598 sink.push(name.to_string());
602 if attr.is_word() && name == sym::document_private_items {
603 ctxt.render_options.document_private = true;
607 let passes = passes::defaults(default_passes).iter().copied().chain(
608 manual_passes.into_iter().flat_map(|name| {
609 if let Some(pass) = passes::find_pass(&name) {
610 Some(ConditionalPass::always(pass))
612 error!("unknown pass {}, skipping", name);
618 info!("Executing passes");
621 let run = match p.condition {
623 WhenDocumentPrivate => ctxt.render_options.document_private,
624 WhenNotDocumentPrivate => !ctxt.render_options.document_private,
625 WhenNotDocumentHidden => !ctxt.render_options.document_hidden,
628 debug!("running pass {}", p.pass.name);
629 krate = ctxt.tcx.sess.time(p.pass.name, || (p.pass.run)(krate, &ctxt));
633 ctxt.sess().abort_if_errors();
635 // The main crate doc comments are always collapsed.
636 krate.collapsed = true;
638 (krate, ctxt.renderinfo.into_inner(), ctxt.render_options)
641 /// Due to <https://github.com/rust-lang/rust/pull/73566>,
642 /// the name resolution pass may find errors that are never emitted.
643 /// If typeck is called after this happens, then we'll get an ICE:
644 /// 'Res::Error found but not reported'. To avoid this, emit the errors now.
645 struct EmitIgnoredResolutionErrors<'tcx> {
649 impl<'tcx> EmitIgnoredResolutionErrors<'tcx> {
650 fn new(tcx: TyCtxt<'tcx>) -> Self {
655 impl<'tcx> Visitor<'tcx> for EmitIgnoredResolutionErrors<'tcx> {
656 type Map = Map<'tcx>;
658 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
659 // We need to recurse into nested closures,
660 // since those will fallback to the parent for type checking.
661 NestedVisitorMap::OnlyBodies(self.tcx.hir())
664 fn visit_path(&mut self, path: &'tcx Path<'_>, _id: HirId) {
665 debug!("visiting path {:?}", path);
666 if path.res == Res::Err {
667 // We have less context here than in rustc_resolve,
668 // so we can only emit the name and span.
669 // However we can give a hint that rustc_resolve will have more info.
671 "could not resolve path `{}`",
674 .map(|segment| segment.ident.as_str().to_string())
678 let mut err = rustc_errors::struct_span_err!(
682 "failed to resolve: {}",
685 err.span_label(path.span, label);
686 err.note("this error was originally ignored because you are running `rustdoc`");
687 err.note("try running again with `rustc` or `cargo check` and you may get a more detailed error");
690 // We could have an outer resolution that succeeded,
691 // but with generic parameters that failed.
692 // Recurse into the segments so we catch those too.
693 intravisit::walk_path(self, path);
697 /// `DefId` or parameter index (`ty::ParamTy.index`) of a synthetic type parameter
698 /// for `impl Trait` in argument position.
699 #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
700 crate enum ImplTraitParam {
705 impl From<DefId> for ImplTraitParam {
706 fn from(did: DefId) -> Self {
707 ImplTraitParam::DefId(did)
711 impl From<u32> for ImplTraitParam {
712 fn from(idx: u32) -> Self {
713 ImplTraitParam::ParamIndex(idx)