src/librustdoc/core.rs

   1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use rustc_lint;
  12 use rustc_driver::{self, driver, target_features, abort_on_err};
  13 use rustc::session::{self, config};
  14 use rustc::hir::def_id::{DefId, DefIndex, DefIndexAddressSpace, CrateNum, LOCAL_CRATE};
  15 use rustc::hir::def::Def;
  16 use rustc::hir::{self, HirVec};
  17 use rustc::middle::cstore::CrateStore;
  18 use rustc::middle::privacy::AccessLevels;
  19 use rustc::ty::{self, TyCtxt, AllArenas};
  20 use rustc::hir::map as hir_map;
  21 use rustc::lint::{self, LintPass};
  22 use rustc::session::config::ErrorOutputType;
  23 use rustc::util::nodemap::{FxHashMap, FxHashSet};
  24 use rustc_resolve as resolve;
  25 use rustc_metadata::creader::CrateLoader;
  26 use rustc_metadata::cstore::CStore;
  27 use rustc_target::spec::TargetTriple;
  28
  29 use syntax::ast::{self, Ident, NodeId};
  30 use syntax::source_map;
  31 use syntax::edition::Edition;
  32 use syntax::feature_gate::UnstableFeatures;
  33 use syntax::json::JsonEmitter;
  34 use syntax::ptr::P;
  35 use syntax::symbol::keywords;
  36 use syntax_pos::DUMMY_SP;
  37 use errors;
  38 use errors::emitter::{Emitter, EmitterWriter};
  39 use parking_lot::ReentrantMutex;
  40
  41 use std::cell::RefCell;
  42 use std::mem;
  43 use rustc_data_structures::sync::{self, Lrc};
  44 use std::rc::Rc;
  45 use std::sync::Arc;
  46 use std::path::PathBuf;
  47
  48 use visit_ast::RustdocVisitor;
  49 use clean;
  50 use clean::{get_path_for_type, Clean, MAX_DEF_ID, AttributesExt};
  51 use html::render::RenderInfo;
  52 use passes;
  53
  54 pub use rustc::session::config::{Input, Options, CodegenOptions};
  55 pub use rustc::session::search_paths::SearchPaths;
  56
  57 pub type ExternalPaths = FxHashMap<DefId, (Vec<String>, clean::TypeKind)>;
  58
  59 pub struct DocContext<'a, 'tcx: 'a, 'rcx: 'a, 'cstore: 'rcx> {
  60     pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
  61     pub resolver: &'a RefCell<resolve::Resolver<'rcx, 'cstore>>,
  62     /// The stack of module NodeIds up till this point
  63     pub crate_name: Option<String>,
  64     pub cstore: Rc<CStore>,
  65     // Note that external items for which `doc(hidden)` applies to are shown as
  66     // non-reachable while local items aren't. This is because we're reusing
  67     // the access levels from crateanalysis.
  68     /// Later on moved into `html::render::CACHE_KEY`
  69     pub renderinfo: RefCell<RenderInfo>,
  70     /// Later on moved through `clean::Crate` into `html::render::CACHE_KEY`
  71     pub external_traits: Arc<ReentrantMutex<RefCell<FxHashMap<DefId, clean::Trait>>>>,
  72     /// Used while populating `external_traits` to ensure we don't process the same trait twice at
  73     /// the same time.
  74     pub active_extern_traits: RefCell<Vec<DefId>>,
  75     // The current set of type and lifetime substitutions,
  76     // for expanding type aliases at the HIR level:
  77
  78     /// Table type parameter definition -> substituted type
  79     pub ty_substs: RefCell<FxHashMap<Def, clean::Type>>,
  80     /// Table node id of lifetime parameter definition -> substituted lifetime
  81     pub lt_substs: RefCell<FxHashMap<DefId, clean::Lifetime>>,
  82     /// Table DefId of `impl Trait` in argument position -> bounds
  83     pub impl_trait_bounds: RefCell<FxHashMap<DefId, Vec<clean::GenericBound>>>,
  84     pub send_trait: Option<DefId>,
  85     pub fake_def_ids: RefCell<FxHashMap<CrateNum, DefId>>,
  86     pub all_fake_def_ids: RefCell<FxHashSet<DefId>>,
  87     /// Maps (type_id, trait_id) -> auto trait impl
  88     pub generated_synthetics: RefCell<FxHashSet<(DefId, DefId)>>,
  89     pub all_traits: Vec<DefId>,
  90 }
  91
  92 impl<'a, 'tcx, 'rcx, 'cstore> DocContext<'a, 'tcx, 'rcx, 'cstore> {
  93     pub fn sess(&self) -> &session::Session {
  94         &self.tcx.sess
  95     }
  96
  97     /// Call the closure with the given parameters set as
  98     /// the substitutions for a type alias' RHS.
  99     pub fn enter_alias<F, R>(&self,
 100                              ty_substs: FxHashMap<Def, clean::Type>,
 101                              lt_substs: FxHashMap<DefId, clean::Lifetime>,
 102                              f: F) -> R
 103     where F: FnOnce() -> R {
 104         let (old_tys, old_lts) =
 105             (mem::replace(&mut *self.ty_substs.borrow_mut(), ty_substs),
 106              mem::replace(&mut *self.lt_substs.borrow_mut(), lt_substs));
 107         let r = f();
 108         *self.ty_substs.borrow_mut() = old_tys;
 109         *self.lt_substs.borrow_mut() = old_lts;
 110         r
 111     }
 112
 113     // This is an ugly hack, but it's the simplest way to handle synthetic impls without greatly
 114     // refactoring either librustdoc or librustc. In particular, allowing new DefIds to be
 115     // registered after the AST is constructed would require storing the defid mapping in a
 116     // RefCell, decreasing the performance for normal compilation for very little gain.
 117     //
 118     // Instead, we construct 'fake' def ids, which start immediately after the last DefId in
 119     // DefIndexAddressSpace::Low. In the Debug impl for clean::Item, we explicitly check for fake
 120     // def ids, as we'll end up with a panic if we use the DefId Debug impl for fake DefIds
 121     pub fn next_def_id(&self, crate_num: CrateNum) -> DefId {
 122         let start_def_id = {
 123             let next_id = if crate_num == LOCAL_CRATE {
 124                 self.tcx
 125                     .hir
 126                     .definitions()
 127                     .def_path_table()
 128                     .next_id(DefIndexAddressSpace::Low)
 129             } else {
 130                 self.cstore
 131                     .def_path_table(crate_num)
 132                     .next_id(DefIndexAddressSpace::Low)
 133             };
 134
 135             DefId {
 136                 krate: crate_num,
 137                 index: next_id,
 138             }
 139         };
 140
 141         let mut fake_ids = self.fake_def_ids.borrow_mut();
 142
 143         let def_id = fake_ids.entry(crate_num).or_insert(start_def_id).clone();
 144         fake_ids.insert(
 145             crate_num,
 146             DefId {
 147                 krate: crate_num,
 148                 index: DefIndex::from_array_index(
 149                     def_id.index.as_array_index() + 1,
 150                     def_id.index.address_space(),
 151                 ),
 152             },
 153         );
 154
 155         MAX_DEF_ID.with(|m| {
 156             m.borrow_mut()
 157                 .entry(def_id.krate.clone())
 158                 .or_insert(start_def_id);
 159         });
 160
 161         self.all_fake_def_ids.borrow_mut().insert(def_id);
 162
 163         def_id.clone()
 164     }
 165
 166     /// Like the function of the same name on the HIR map, but skips calling it on fake DefIds.
 167     /// (This avoids a slice-index-out-of-bounds panic.)
 168     pub fn as_local_node_id(&self, def_id: DefId) -> Option<NodeId> {
 169         if self.all_fake_def_ids.borrow().contains(&def_id) {
 170             None
 171         } else {
 172             self.tcx.hir.as_local_node_id(def_id)
 173         }
 174     }
 175
 176     pub fn get_real_ty<F>(&self,
 177                           def_id: DefId,
 178                           def_ctor: &F,
 179                           real_name: &Option<Ident>,
 180                           generics: &ty::Generics,
 181     ) -> hir::Ty
 182     where F: Fn(DefId) -> Def {
 183         let path = get_path_for_type(self.tcx, def_id, def_ctor);
 184         let mut segments = path.segments.into_vec();
 185         let last = segments.pop().expect("segments were empty");
 186
 187         segments.push(hir::PathSegment::new(
 188             real_name.unwrap_or(last.ident),
 189             self.generics_to_path_params(generics.clone()),
 190             false,
 191         ));
 192
 193         let new_path = hir::Path {
 194             span: path.span,
 195             def: path.def,
 196             segments: HirVec::from_vec(segments),
 197         };
 198
 199         hir::Ty {
 200             id: ast::DUMMY_NODE_ID,
 201             node: hir::TyKind::Path(hir::QPath::Resolved(None, P(new_path))),
 202             span: DUMMY_SP,
 203             hir_id: hir::DUMMY_HIR_ID,
 204         }
 205     }
 206
 207     pub fn generics_to_path_params(&self, generics: ty::Generics) -> hir::GenericArgs {
 208         let mut args = vec![];
 209
 210         for param in generics.params.iter() {
 211             match param.kind {
 212                 ty::GenericParamDefKind::Lifetime => {
 213                     let name = if param.name == "" {
 214                         hir::ParamName::Plain(keywords::StaticLifetime.ident())
 215                     } else {
 216                         hir::ParamName::Plain(ast::Ident::from_interned_str(param.name))
 217                     };
 218
 219                     args.push(hir::GenericArg::Lifetime(hir::Lifetime {
 220                         id: ast::DUMMY_NODE_ID,
 221                         span: DUMMY_SP,
 222                         name: hir::LifetimeName::Param(name),
 223                     }));
 224                 }
 225                 ty::GenericParamDefKind::Type {..} => {
 226                     args.push(hir::GenericArg::Type(self.ty_param_to_ty(param.clone())));
 227                 }
 228             }
 229         }
 230
 231         hir::GenericArgs {
 232             args: HirVec::from_vec(args),
 233             bindings: HirVec::new(),
 234             parenthesized: false,
 235         }
 236     }
 237
 238     pub fn ty_param_to_ty(&self, param: ty::GenericParamDef) -> hir::Ty {
 239         debug!("ty_param_to_ty({:?}) {:?}", param, param.def_id);
 240         hir::Ty {
 241             id: ast::DUMMY_NODE_ID,
 242             node: hir::TyKind::Path(hir::QPath::Resolved(
 243                 None,
 244                 P(hir::Path {
 245                     span: DUMMY_SP,
 246                     def: Def::TyParam(param.def_id),
 247                     segments: HirVec::from_vec(vec![
 248                         hir::PathSegment::from_ident(Ident::from_interned_str(param.name))
 249                     ]),
 250                 }),
 251             )),
 252             span: DUMMY_SP,
 253             hir_id: hir::DUMMY_HIR_ID,
 254         }
 255     }
 256 }
 257
 258 pub trait DocAccessLevels {
 259     fn is_doc_reachable(&self, did: DefId) -> bool;
 260 }
 261
 262 impl DocAccessLevels for AccessLevels<DefId> {
 263     fn is_doc_reachable(&self, did: DefId) -> bool {
 264         self.is_public(did)
 265     }
 266 }
 267
 268 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
 269 ///
 270 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
 271 /// will be created for the handler.
 272 pub fn new_handler(error_format: ErrorOutputType,
 273                    source_map: Option<Lrc<source_map::SourceMap>>,
 274                    treat_err_as_bug: bool,
 275 ) -> errors::Handler {
 276     // rustdoc doesn't override (or allow to override) anything from this that is relevant here, so
 277     // stick to the defaults
 278     let sessopts = Options::default();
 279     let emitter: Box<dyn Emitter + sync::Send> = match error_format {
 280         ErrorOutputType::HumanReadable(color_config) => Box::new(
 281             EmitterWriter::stderr(
 282                 color_config,
 283                 source_map.map(|cm| cm as _),
 284                 false,
 285                 sessopts.debugging_opts.teach,
 286             ).ui_testing(sessopts.debugging_opts.ui_testing)
 287         ),
 288         ErrorOutputType::Json(pretty) => {
 289             let source_map = source_map.unwrap_or_else(
 290                 || Lrc::new(source_map::SourceMap::new(sessopts.file_path_mapping())));
 291             Box::new(
 292                 JsonEmitter::stderr(
 293                     None,
 294                     source_map,
 295                     pretty,
 296                 ).ui_testing(sessopts.debugging_opts.ui_testing)
 297             )
 298         },
 299         ErrorOutputType::Short(color_config) => Box::new(
 300             EmitterWriter::stderr(
 301                 color_config,
 302                 source_map.map(|cm| cm as _),
 303                 true,
 304                 false)
 305         ),
 306     };
 307
 308     errors::Handler::with_emitter_and_flags(
 309         emitter,
 310         errors::HandlerFlags {
 311             can_emit_warnings: true,
 312             treat_err_as_bug,
 313             report_delayed_bugs: false,
 314             external_macro_backtrace: false,
 315             ..Default::default()
 316         },
 317     )
 318 }
 319
 320 pub fn run_core(search_paths: SearchPaths,
 321                 cfgs: Vec<String>,
 322                 externs: config::Externs,
 323                 input: Input,
 324                 triple: Option<TargetTriple>,
 325                 maybe_sysroot: Option<PathBuf>,
 326                 allow_warnings: bool,
 327                 crate_name: Option<String>,
 328                 force_unstable_if_unmarked: bool,
 329                 edition: Edition,
 330                 cg: CodegenOptions,
 331                 error_format: ErrorOutputType,
 332                 cmd_lints: Vec<(String, lint::Level)>,
 333                 lint_cap: Option<lint::Level>,
 334                 describe_lints: bool,
 335                 mut manual_passes: Vec<String>,
 336                 mut default_passes: passes::DefaultPassOption,
 337                 treat_err_as_bug: bool,
 338 ) -> (clean::Crate, RenderInfo, Vec<String>) {
 339     // Parse, resolve, and typecheck the given crate.
 340
 341     let cpath = match input {
 342         Input::File(ref p) => Some(p.clone()),
 343         _ => None
 344     };
 345
 346     let intra_link_resolution_failure_name = lint::builtin::INTRA_DOC_LINK_RESOLUTION_FAILURE.name;
 347     let warnings_lint_name = lint::builtin::WARNINGS.name;
 348     let missing_docs = rustc_lint::builtin::MISSING_DOCS.name;
 349
 350     // In addition to those specific lints, we also need to whitelist those given through
 351     // command line, otherwise they'll get ignored and we don't want that.
 352     let mut whitelisted_lints = vec![warnings_lint_name.to_owned(),
 353                                      intra_link_resolution_failure_name.to_owned(),
 354                                      missing_docs.to_owned()];
 355
 356     whitelisted_lints.extend(cmd_lints.iter().map(|(lint, _)| lint).cloned());
 357
 358     let lints = lint::builtin::HardwiredLints.get_lints()
 359                     .into_iter()
 360                     .chain(rustc_lint::SoftLints.get_lints().into_iter())
 361                     .filter_map(|lint| {
 362                         if lint.name == warnings_lint_name ||
 363                            lint.name == intra_link_resolution_failure_name {
 364                             None
 365                         } else {
 366                             Some((lint.name_lower(), lint::Allow))
 367                         }
 368                     })
 369                     .chain(cmd_lints.into_iter())
 370                     .collect::<Vec<_>>();
 371
 372     let host_triple = TargetTriple::from_triple(config::host_triple());
 373     // plays with error output here!
 374     let sessopts = config::Options {
 375         maybe_sysroot,
 376         search_paths,
 377         crate_types: vec![config::CrateType::Rlib],
 378         lint_opts: if !allow_warnings {
 379             lints
 380         } else {
 381             vec![]
 382         },
 383         lint_cap: Some(lint_cap.unwrap_or_else(|| lint::Forbid)),
 384         cg,
 385         externs,
 386         target_triple: triple.unwrap_or(host_triple),
 387         // Ensure that rustdoc works even if rustc is feature-staged
 388         unstable_features: UnstableFeatures::Allow,
 389         actually_rustdoc: true,
 390         debugging_opts: config::DebuggingOptions {
 391             force_unstable_if_unmarked,
 392             ..config::basic_debugging_options()
 393         },
 394         error_format,
 395         edition,
 396         describe_lints,
 397         ..Options::default()
 398     };
 399     driver::spawn_thread_pool(sessopts, move |sessopts| {
 400         let source_map = Lrc::new(source_map::SourceMap::new(sessopts.file_path_mapping()));
 401         let diagnostic_handler = new_handler(error_format,
 402                                              Some(source_map.clone()),
 403                                              treat_err_as_bug);
 404
 405         let mut sess = session::build_session_(
 406             sessopts, cpath, diagnostic_handler, source_map,
 407         );
 408
 409         lint::builtin::HardwiredLints.get_lints()
 410                                      .into_iter()
 411                                      .chain(rustc_lint::SoftLints.get_lints().into_iter())
 412                                      .filter_map(|lint| {
 413                                          // We don't want to whitelist *all* lints so let's
 414                                          // ignore those ones.
 415                                          if whitelisted_lints.iter().any(|l| &lint.name == l) {
 416                                              None
 417                                          } else {
 418                                              Some(lint)
 419                                          }
 420                                      })
 421                                      .for_each(|l| {
 422                                          sess.driver_lint_caps.insert(lint::LintId::of(l),
 423                                                                       lint::Allow);
 424                                      });
 425
 426         let codegen_backend = rustc_driver::get_codegen_backend(&sess);
 427         let cstore = Rc::new(CStore::new(codegen_backend.metadata_loader()));
 428         rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
 429
 430         let mut cfg = config::build_configuration(&sess, config::parse_cfgspecs(cfgs));
 431         target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
 432         sess.parse_sess.config = cfg;
 433
 434         let control = &driver::CompileController::basic();
 435
 436         let krate = panictry!(driver::phase_1_parse_input(control, &sess, &input));
 437
 438         let name = match crate_name {
 439             Some(ref crate_name) => crate_name.clone(),
 440             None => ::rustc_codegen_utils::link::find_crate_name(Some(&sess), &krate.attrs, &input),
 441         };
 442
 443         let mut crate_loader = CrateLoader::new(&sess, &cstore, &name);
 444
 445         let resolver_arenas = resolve::Resolver::arenas();
 446         let result = driver::phase_2_configure_and_expand_inner(&sess,
 447                                                         &cstore,
 448                                                         krate,
 449                                                         None,
 450                                                         &name,
 451                                                         None,
 452                                                         resolve::MakeGlobMap::No,
 453                                                         &resolver_arenas,
 454                                                         &mut crate_loader,
 455                                                         |_| Ok(()));
 456         let driver::InnerExpansionResult {
 457             mut hir_forest,
 458             resolver,
 459             ..
 460         } = abort_on_err(result, &sess);
 461
 462         // We need to hold on to the complete resolver, so we clone everything
 463         // for the analysis passes to use. Suboptimal, but necessary in the
 464         // current architecture.
 465         let defs = resolver.definitions.clone();
 466         let resolutions = ty::Resolutions {
 467             freevars: resolver.freevars.clone(),
 468             export_map: resolver.export_map.clone(),
 469             trait_map: resolver.trait_map.clone(),
 470             maybe_unused_trait_imports: resolver.maybe_unused_trait_imports.clone(),
 471             maybe_unused_extern_crates: resolver.maybe_unused_extern_crates.clone(),
 472         };
 473         let analysis = ty::CrateAnalysis {
 474             access_levels: Lrc::new(AccessLevels::default()),
 475             name: name.to_string(),
 476             glob_map: if resolver.make_glob_map { Some(resolver.glob_map.clone()) } else { None },
 477         };
 478
 479         let arenas = AllArenas::new();
 480         let hir_map = hir_map::map_crate(&sess, &*cstore, &mut hir_forest, &defs);
 481         let output_filenames = driver::build_output_filenames(&input,
 482                                                             &None,
 483                                                             &None,
 484                                                             &[],
 485                                                             &sess);
 486
 487         let resolver = RefCell::new(resolver);
 488         abort_on_err(driver::phase_3_run_analysis_passes(&*codegen_backend,
 489                                                         control,
 490                                                         &sess,
 491                                                         &*cstore,
 492                                                         hir_map,
 493                                                         analysis,
 494                                                         resolutions,
 495                                                         &arenas,
 496                                                         &name,
 497                                                         &output_filenames,
 498                                                         |tcx, analysis, _, result| {
 499             if result.is_err() {
 500                 sess.fatal("Compilation failed, aborting rustdoc");
 501             }
 502
 503             let ty::CrateAnalysis { access_levels, .. } = analysis;
 504
 505             // Convert from a NodeId set to a DefId set since we don't always have easy access
 506             // to the map from defid -> nodeid
 507             let access_levels = AccessLevels {
 508                 map: access_levels.map.iter()
 509                                     .map(|(&k, &v)| (tcx.hir.local_def_id(k), v))
 510                                     .collect()
 511             };
 512
 513             let send_trait = if crate_name == Some("core".to_string()) {
 514                 clean::path_to_def_local(&tcx, &["marker", "Send"])
 515             } else {
 516                 clean::path_to_def(&tcx, &["core", "marker", "Send"])
 517             };
 518
 519             let mut renderinfo = RenderInfo::default();
 520             renderinfo.access_levels = access_levels;
 521
 522             let ctxt = DocContext {
 523                 tcx,
 524                 resolver: &resolver,
 525                 crate_name,
 526                 cstore: cstore.clone(),
 527                 external_traits: Default::default(),
 528                 active_extern_traits: Default::default(),
 529                 renderinfo: RefCell::new(renderinfo),
 530                 ty_substs: Default::default(),
 531                 lt_substs: Default::default(),
 532                 impl_trait_bounds: Default::default(),
 533                 send_trait: send_trait,
 534                 fake_def_ids: RefCell::new(FxHashMap()),
 535                 all_fake_def_ids: RefCell::new(FxHashSet()),
 536                 generated_synthetics: RefCell::new(FxHashSet()),
 537                 all_traits: tcx.all_traits(LOCAL_CRATE).to_vec(),
 538             };
 539             debug!("crate: {:?}", tcx.hir.krate());
 540
 541             let mut krate = {
 542                 let mut v = RustdocVisitor::new(&ctxt);
 543                 v.visit(tcx.hir.krate());
 544                 v.clean(&ctxt)
 545             };
 546
 547             fn report_deprecated_attr(name: &str, diag: &errors::Handler) {
 548                 let mut msg = diag.struct_warn(&format!("the `#![doc({})]` attribute is \
 549                                                          considered deprecated", name));
 550                 msg.warn("please see https://github.com/rust-lang/rust/issues/44136");
 551
 552                 if name == "no_default_passes" {
 553                     msg.help("you may want to use `#![doc(document_private_items)]`");
 554                 }
 555
 556                 msg.emit();
 557             }
 558
 559             // Process all of the crate attributes, extracting plugin metadata along
 560             // with the passes which we are supposed to run.
 561             for attr in krate.module.as_ref().unwrap().attrs.lists("doc") {
 562                 let diag = ctxt.sess().diagnostic();
 563
 564                 let name = attr.name().map(|s| s.as_str());
 565                 let name = name.as_ref().map(|s| &s[..]);
 566                 if attr.is_word() {
 567                     if name == Some("no_default_passes") {
 568                         report_deprecated_attr("no_default_passes", diag);
 569                         if default_passes == passes::DefaultPassOption::Default {
 570                             default_passes = passes::DefaultPassOption::None;
 571                         }
 572                     }
 573                 } else if let Some(value) = attr.value_str() {
 574                     let sink = match name {
 575                         Some("passes") => {
 576                             report_deprecated_attr("passes = \"...\"", diag);
 577                             &mut manual_passes
 578                         },
 579                         Some("plugins") => {
 580                             report_deprecated_attr("plugins = \"...\"", diag);
 581                             eprintln!("WARNING: #![doc(plugins = \"...\")] no longer functions; \
 582                                       see CVE-2018-1000622");
 583                             continue
 584                         },
 585                         _ => continue,
 586                     };
 587                     for p in value.as_str().split_whitespace() {
 588                         sink.push(p.to_string());
 589                     }
 590                 }
 591
 592                 if attr.is_word() && name == Some("document_private_items") {
 593                     if default_passes == passes::DefaultPassOption::Default {
 594                         default_passes = passes::DefaultPassOption::Private;
 595                     }
 596                 }
 597             }
 598
 599             let mut passes: Vec<String> =
 600                 passes::defaults(default_passes).iter().map(|p| p.to_string()).collect();
 601             passes.extend(manual_passes);
 602
 603             for pass in &passes {
 604                 // the "unknown pass" error will be reported when late passes are run
 605                 if let Some(pass) = passes::find_pass(pass).and_then(|p| p.early_fn()) {
 606                     krate = pass(krate, &ctxt);
 607                 }
 608             }
 609
 610             ctxt.sess().abort_if_errors();
 611
 612             (krate, ctxt.renderinfo.into_inner(), passes)
 613         }), &sess)
 614     })
 615 }