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