]> git.lizzy.rs Git - rust.git/blob - src/librustdoc/core.rs
Auto merge of #67312 - cuviper:clone-box-slice, r=SimonSapin
[rust.git] / src / librustdoc / core.rs
1 use rustc::lint;
2 use rustc::middle::cstore::CrateStore;
3 use rustc::middle::privacy::AccessLevels;
4 use rustc::session::config::ErrorOutputType;
5 use rustc::session::DiagnosticOutput;
6 use rustc::session::{self, config};
7 use rustc::ty::{Ty, TyCtxt};
8 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
9 use rustc_driver::abort_on_err;
10 use rustc_feature::UnstableFeatures;
11 use rustc_hir::def::Namespace::TypeNS;
12 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, LOCAL_CRATE};
13 use rustc_hir::HirId;
14 use rustc_interface::interface;
15 use rustc_lint;
16 use rustc_resolve as resolve;
17
18 use errors::emitter::{Emitter, EmitterWriter};
19 use errors::json::JsonEmitter;
20 use rustc_span::source_map;
21 use rustc_span::symbol::sym;
22 use rustc_span::DUMMY_SP;
23 use syntax::ast::CRATE_NODE_ID;
24 use syntax::attr;
25
26 use rustc_data_structures::sync::{self, Lrc};
27 use std::cell::RefCell;
28 use std::mem;
29 use std::rc::Rc;
30
31 use crate::clean;
32 use crate::clean::{AttributesExt, MAX_DEF_ID};
33 use crate::config::{Options as RustdocOptions, RenderOptions};
34 use crate::html::render::RenderInfo;
35
36 use crate::passes;
37
38 pub use rustc::session::config::{CodegenOptions, DebuggingOptions, Input, Options};
39 pub use rustc::session::search_paths::SearchPath;
40
41 pub type ExternalPaths = FxHashMap<DefId, (Vec<String>, clean::TypeKind)>;
42
43 pub struct DocContext<'tcx> {
44     pub tcx: TyCtxt<'tcx>,
45     pub resolver: Rc<RefCell<interface::BoxedResolver>>,
46     /// Later on moved into `html::render::CACHE_KEY`
47     pub renderinfo: RefCell<RenderInfo>,
48     /// Later on moved through `clean::Crate` into `html::render::CACHE_KEY`
49     pub external_traits: Rc<RefCell<FxHashMap<DefId, clean::Trait>>>,
50     /// Used while populating `external_traits` to ensure we don't process the same trait twice at
51     /// the same time.
52     pub active_extern_traits: RefCell<FxHashSet<DefId>>,
53     // The current set of type and lifetime substitutions,
54     // for expanding type aliases at the HIR level:
55     /// Table `DefId` of type parameter -> substituted type
56     pub ty_substs: RefCell<FxHashMap<DefId, clean::Type>>,
57     /// Table `DefId` of lifetime parameter -> substituted lifetime
58     pub lt_substs: RefCell<FxHashMap<DefId, clean::Lifetime>>,
59     /// Table `DefId` of const parameter -> substituted const
60     pub ct_substs: RefCell<FxHashMap<DefId, clean::Constant>>,
61     /// Table synthetic type parameter for `impl Trait` in argument position -> bounds
62     pub impl_trait_bounds: RefCell<FxHashMap<ImplTraitParam, Vec<clean::GenericBound>>>,
63     pub fake_def_ids: RefCell<FxHashMap<CrateNum, DefId>>,
64     pub all_fake_def_ids: RefCell<FxHashSet<DefId>>,
65     /// Auto-trait or blanket impls processed so far, as `(self_ty, trait_def_id)`.
66     // FIXME(eddyb) make this a `ty::TraitRef<'tcx>` set.
67     pub generated_synthetics: RefCell<FxHashSet<(Ty<'tcx>, DefId)>>,
68     pub auto_traits: Vec<DefId>,
69 }
70
71 impl<'tcx> DocContext<'tcx> {
72     pub fn sess(&self) -> &session::Session {
73         &self.tcx.sess
74     }
75
76     pub fn enter_resolver<F, R>(&self, f: F) -> R
77     where
78         F: FnOnce(&mut resolve::Resolver<'_>) -> R,
79     {
80         self.resolver.borrow_mut().access(f)
81     }
82
83     /// Call the closure with the given parameters set as
84     /// the substitutions for a type alias' RHS.
85     pub fn enter_alias<F, R>(
86         &self,
87         ty_substs: FxHashMap<DefId, clean::Type>,
88         lt_substs: FxHashMap<DefId, clean::Lifetime>,
89         ct_substs: FxHashMap<DefId, clean::Constant>,
90         f: F,
91     ) -> R
92     where
93         F: FnOnce() -> R,
94     {
95         let (old_tys, old_lts, old_cts) = (
96             mem::replace(&mut *self.ty_substs.borrow_mut(), ty_substs),
97             mem::replace(&mut *self.lt_substs.borrow_mut(), lt_substs),
98             mem::replace(&mut *self.ct_substs.borrow_mut(), ct_substs),
99         );
100         let r = f();
101         *self.ty_substs.borrow_mut() = old_tys;
102         *self.lt_substs.borrow_mut() = old_lts;
103         *self.ct_substs.borrow_mut() = old_cts;
104         r
105     }
106
107     // This is an ugly hack, but it's the simplest way to handle synthetic impls without greatly
108     // refactoring either librustdoc or librustc. In particular, allowing new DefIds to be
109     // registered after the AST is constructed would require storing the defid mapping in a
110     // RefCell, decreasing the performance for normal compilation for very little gain.
111     //
112     // Instead, we construct 'fake' def ids, which start immediately after the last DefId.
113     // In the Debug impl for clean::Item, we explicitly check for fake
114     // def ids, as we'll end up with a panic if we use the DefId Debug impl for fake DefIds
115     pub fn next_def_id(&self, crate_num: CrateNum) -> DefId {
116         let start_def_id = {
117             let next_id = if crate_num == LOCAL_CRATE {
118                 self.tcx.hir().definitions().def_path_table().next_id()
119             } else {
120                 self.enter_resolver(|r| r.cstore().def_path_table(crate_num).next_id())
121             };
122
123             DefId { krate: crate_num, index: next_id }
124         };
125
126         let mut fake_ids = self.fake_def_ids.borrow_mut();
127
128         let def_id = fake_ids.entry(crate_num).or_insert(start_def_id).clone();
129         fake_ids.insert(
130             crate_num,
131             DefId { krate: crate_num, index: DefIndex::from(def_id.index.index() + 1) },
132         );
133
134         MAX_DEF_ID.with(|m| {
135             m.borrow_mut().entry(def_id.krate.clone()).or_insert(start_def_id);
136         });
137
138         self.all_fake_def_ids.borrow_mut().insert(def_id);
139
140         def_id.clone()
141     }
142
143     /// Like the function of the same name on the HIR map, but skips calling it on fake DefIds.
144     /// (This avoids a slice-index-out-of-bounds panic.)
145     pub fn as_local_hir_id(&self, def_id: DefId) -> Option<HirId> {
146         if self.all_fake_def_ids.borrow().contains(&def_id) {
147             None
148         } else {
149             self.tcx.hir().as_local_hir_id(def_id)
150         }
151     }
152
153     pub fn stability(&self, id: HirId) -> Option<attr::Stability> {
154         self.tcx
155             .hir()
156             .opt_local_def_id(id)
157             .and_then(|def_id| self.tcx.lookup_stability(def_id))
158             .cloned()
159     }
160
161     pub fn deprecation(&self, id: HirId) -> Option<attr::Deprecation> {
162         self.tcx.hir().opt_local_def_id(id).and_then(|def_id| self.tcx.lookup_deprecation(def_id))
163     }
164 }
165
166 /// Creates a new diagnostic `Handler` that can be used to emit warnings and errors.
167 ///
168 /// If the given `error_format` is `ErrorOutputType::Json` and no `SourceMap` is given, a new one
169 /// will be created for the handler.
170 pub fn new_handler(
171     error_format: ErrorOutputType,
172     source_map: Option<Lrc<source_map::SourceMap>>,
173     debugging_opts: &DebuggingOptions,
174 ) -> errors::Handler {
175     let emitter: Box<dyn Emitter + sync::Send> = match error_format {
176         ErrorOutputType::HumanReadable(kind) => {
177             let (short, color_config) = kind.unzip();
178             Box::new(
179                 EmitterWriter::stderr(
180                     color_config,
181                     source_map.map(|cm| cm as _),
182                     short,
183                     debugging_opts.teach,
184                     debugging_opts.terminal_width,
185                     false,
186                 )
187                 .ui_testing(debugging_opts.ui_testing()),
188             )
189         }
190         ErrorOutputType::Json { pretty, json_rendered } => {
191             let source_map = source_map.unwrap_or_else(|| {
192                 Lrc::new(source_map::SourceMap::new(source_map::FilePathMapping::empty()))
193             });
194             Box::new(
195                 JsonEmitter::stderr(None, source_map, pretty, json_rendered, false)
196                     .ui_testing(debugging_opts.ui_testing()),
197             )
198         }
199     };
200
201     errors::Handler::with_emitter_and_flags(emitter, debugging_opts.diagnostic_handler_flags(true))
202 }
203
204 pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOptions) {
205     // Parse, resolve, and typecheck the given crate.
206
207     let RustdocOptions {
208         input,
209         crate_name,
210         proc_macro_crate,
211         error_format,
212         libs,
213         externs,
214         mut cfgs,
215         codegen_options,
216         debugging_options,
217         target,
218         edition,
219         maybe_sysroot,
220         lint_opts,
221         describe_lints,
222         lint_cap,
223         mut default_passes,
224         mut manual_passes,
225         display_warnings,
226         render_options,
227         ..
228     } = options;
229
230     let extern_names: Vec<String> = externs
231         .iter()
232         .filter(|(_, entry)| entry.add_prelude)
233         .map(|(name, _)| name)
234         .cloned()
235         .collect();
236
237     // Add the doc cfg into the doc build.
238     cfgs.push("doc".to_string());
239
240     let cpath = Some(input.clone());
241     let input = Input::File(input);
242
243     let intra_link_resolution_failure_name = lint::builtin::INTRA_DOC_LINK_RESOLUTION_FAILURE.name;
244     let warnings_lint_name = lint::builtin::WARNINGS.name;
245     let missing_docs = rustc_lint::builtin::MISSING_DOCS.name;
246     let missing_doc_example = rustc_lint::builtin::MISSING_DOC_CODE_EXAMPLES.name;
247     let private_doc_tests = rustc_lint::builtin::PRIVATE_DOC_TESTS.name;
248
249     // In addition to those specific lints, we also need to whitelist those given through
250     // command line, otherwise they'll get ignored and we don't want that.
251     let mut whitelisted_lints = vec![
252         warnings_lint_name.to_owned(),
253         intra_link_resolution_failure_name.to_owned(),
254         missing_docs.to_owned(),
255         missing_doc_example.to_owned(),
256         private_doc_tests.to_owned(),
257     ];
258
259     whitelisted_lints.extend(lint_opts.iter().map(|(lint, _)| lint).cloned());
260
261     let lints = || {
262         lint::builtin::HardwiredLints::get_lints()
263             .into_iter()
264             .chain(rustc_lint::SoftLints::get_lints().into_iter())
265     };
266
267     let lint_opts = lints()
268         .filter_map(|lint| {
269             if lint.name == warnings_lint_name || lint.name == intra_link_resolution_failure_name {
270                 None
271             } else {
272                 Some((lint.name_lower(), lint::Allow))
273             }
274         })
275         .chain(lint_opts.into_iter())
276         .collect::<Vec<_>>();
277
278     let lint_caps = lints()
279         .filter_map(|lint| {
280             // We don't want to whitelist *all* lints so let's
281             // ignore those ones.
282             if whitelisted_lints.iter().any(|l| &lint.name == l) {
283                 None
284             } else {
285                 Some((lint::LintId::of(lint), lint::Allow))
286             }
287         })
288         .collect();
289
290     let crate_types = if proc_macro_crate {
291         vec![config::CrateType::ProcMacro]
292     } else {
293         vec![config::CrateType::Rlib]
294     };
295     // plays with error output here!
296     let sessopts = config::Options {
297         maybe_sysroot,
298         search_paths: libs,
299         crate_types,
300         lint_opts: if !display_warnings { lint_opts } else { vec![] },
301         lint_cap: Some(lint_cap.unwrap_or_else(|| lint::Forbid)),
302         cg: codegen_options,
303         externs,
304         target_triple: target,
305         // Ensure that rustdoc works even if rustc is feature-staged
306         unstable_features: UnstableFeatures::Allow,
307         actually_rustdoc: true,
308         debugging_opts: debugging_options,
309         error_format,
310         edition,
311         describe_lints,
312         ..Options::default()
313     };
314
315     let config = interface::Config {
316         opts: sessopts,
317         crate_cfg: interface::parse_cfgspecs(cfgs),
318         input,
319         input_path: cpath,
320         output_file: None,
321         output_dir: None,
322         file_loader: None,
323         diagnostic_output: DiagnosticOutput::Default,
324         stderr: None,
325         crate_name,
326         lint_caps,
327         register_lints: None,
328         override_queries: None,
329         registry: rustc_driver::diagnostics_registry(),
330     };
331
332     interface::run_compiler_in_existing_thread_pool(config, |compiler| {
333         compiler.enter(|queries| {
334             let sess = compiler.session();
335
336             // We need to hold on to the complete resolver, so we cause everything to be
337             // cloned for the analysis passes to use. Suboptimal, but necessary in the
338             // current architecture.
339             let resolver = {
340                 let parts = abort_on_err(queries.expansion(), sess).peek();
341                 let resolver = parts.1.borrow();
342
343                 // Before we actually clone it, let's force all the extern'd crates to
344                 // actually be loaded, just in case they're only referred to inside
345                 // intra-doc-links
346                 resolver.borrow_mut().access(|resolver| {
347                     for extern_name in &extern_names {
348                         resolver
349                             .resolve_str_path_error(DUMMY_SP, extern_name, TypeNS, CRATE_NODE_ID)
350                             .unwrap_or_else(|()| {
351                                 panic!("Unable to resolve external crate {}", extern_name)
352                             });
353                     }
354                 });
355
356                 // Now we're good to clone the resolver because everything should be loaded
357                 resolver.clone()
358             };
359
360             if sess.has_errors() {
361                 sess.fatal("Compilation failed, aborting rustdoc");
362             }
363
364             let mut global_ctxt = abort_on_err(queries.global_ctxt(), sess).take();
365
366             global_ctxt.enter(|tcx| {
367                 tcx.analysis(LOCAL_CRATE).ok();
368
369                 // Abort if there were any errors so far
370                 sess.abort_if_errors();
371
372                 let access_levels = tcx.privacy_access_levels(LOCAL_CRATE);
373                 // Convert from a HirId set to a DefId set since we don't always have easy access
374                 // to the map from defid -> hirid
375                 let access_levels = AccessLevels {
376                     map: access_levels
377                         .map
378                         .iter()
379                         .map(|(&k, &v)| (tcx.hir().local_def_id(k), v))
380                         .collect(),
381                 };
382
383                 let mut renderinfo = RenderInfo::default();
384                 renderinfo.access_levels = access_levels;
385
386                 let mut ctxt = DocContext {
387                     tcx,
388                     resolver,
389                     external_traits: Default::default(),
390                     active_extern_traits: Default::default(),
391                     renderinfo: RefCell::new(renderinfo),
392                     ty_substs: Default::default(),
393                     lt_substs: Default::default(),
394                     ct_substs: Default::default(),
395                     impl_trait_bounds: Default::default(),
396                     fake_def_ids: Default::default(),
397                     all_fake_def_ids: Default::default(),
398                     generated_synthetics: Default::default(),
399                     auto_traits: tcx
400                         .all_traits(LOCAL_CRATE)
401                         .iter()
402                         .cloned()
403                         .filter(|trait_def_id| tcx.trait_is_auto(*trait_def_id))
404                         .collect(),
405                 };
406                 debug!("crate: {:?}", tcx.hir().krate());
407
408                 let mut krate = clean::krate(&mut ctxt);
409
410                 fn report_deprecated_attr(name: &str, diag: &errors::Handler) {
411                     let mut msg = diag.struct_warn(&format!(
412                         "the `#![doc({})]` attribute is \
413                                                          considered deprecated",
414                         name
415                     ));
416                     msg.warn("please see https://github.com/rust-lang/rust/issues/44136");
417
418                     if name == "no_default_passes" {
419                         msg.help("you may want to use `#![doc(document_private_items)]`");
420                     }
421
422                     msg.emit();
423                 }
424
425                 // Process all of the crate attributes, extracting plugin metadata along
426                 // with the passes which we are supposed to run.
427                 for attr in krate.module.as_ref().unwrap().attrs.lists(sym::doc) {
428                     let diag = ctxt.sess().diagnostic();
429
430                     let name = attr.name_or_empty();
431                     if attr.is_word() {
432                         if name == sym::no_default_passes {
433                             report_deprecated_attr("no_default_passes", diag);
434                             if default_passes == passes::DefaultPassOption::Default {
435                                 default_passes = passes::DefaultPassOption::None;
436                             }
437                         }
438                     } else if let Some(value) = attr.value_str() {
439                         let sink = match name {
440                             sym::passes => {
441                                 report_deprecated_attr("passes = \"...\"", diag);
442                                 &mut manual_passes
443                             }
444                             sym::plugins => {
445                                 report_deprecated_attr("plugins = \"...\"", diag);
446                                 eprintln!(
447                                     "WARNING: `#![doc(plugins = \"...\")]` \
448                                       no longer functions; see CVE-2018-1000622"
449                                 );
450                                 continue;
451                             }
452                             _ => continue,
453                         };
454                         for name in value.as_str().split_whitespace() {
455                             sink.push(name.to_string());
456                         }
457                     }
458
459                     if attr.is_word() && name == sym::document_private_items {
460                         if default_passes == passes::DefaultPassOption::Default {
461                             default_passes = passes::DefaultPassOption::Private;
462                         }
463                     }
464                 }
465
466                 let passes = passes::defaults(default_passes).iter().chain(
467                     manual_passes.into_iter().flat_map(|name| {
468                         if let Some(pass) = passes::find_pass(&name) {
469                             Some(pass)
470                         } else {
471                             error!("unknown pass {}, skipping", name);
472                             None
473                         }
474                     }),
475                 );
476
477                 info!("Executing passes");
478
479                 for pass in passes {
480                     debug!("running pass {}", pass.name);
481                     krate = (pass.pass)(krate, &ctxt);
482                 }
483
484                 ctxt.sess().abort_if_errors();
485
486                 (krate, ctxt.renderinfo.into_inner(), render_options)
487             })
488         })
489     })
490 }
491
492 /// `DefId` or parameter index (`ty::ParamTy.index`) of a synthetic type parameter
493 /// for `impl Trait` in argument position.
494 #[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
495 pub enum ImplTraitParam {
496     DefId(DefId),
497     ParamIndex(u32),
498 }
499
500 impl From<DefId> for ImplTraitParam {
501     fn from(did: DefId) -> Self {
502         ImplTraitParam::DefId(did)
503     }
504 }
505
506 impl From<u32> for ImplTraitParam {
507     fn from(idx: u32) -> Self {
508         ImplTraitParam::ParamIndex(idx)
509     }
510 }