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;
  15 use rustc::hir::def::Def;
  16 use rustc::middle::privacy::AccessLevels;
  17 use rustc::ty::{self, TyCtxt, AllArenas};
  18 use rustc::hir::map as hir_map;
  19 use rustc::lint;
  20 use rustc::util::nodemap::FxHashMap;
  21 use rustc_resolve as resolve;
  22 use rustc_metadata::creader::CrateLoader;
  23 use rustc_metadata::cstore::CStore;
  24
  25 use syntax::ast::NodeId;
  26 use syntax::codemap;
  27 use syntax::feature_gate::UnstableFeatures;
  28 use errors;
  29 use errors::emitter::ColorConfig;
  30
  31 use std::cell::{RefCell, Cell};
  32 use std::mem;
  33 use std::rc::Rc;
  34 use std::path::PathBuf;
  35
  36 use visit_ast::RustdocVisitor;
  37 use clean;
  38 use clean::Clean;
  39 use html::render::RenderInfo;
  40
  41 pub use rustc::session::config::Input;
  42 pub use rustc::session::search_paths::SearchPaths;
  43
  44 pub type ExternalPaths = FxHashMap<DefId, (Vec<String>, clean::TypeKind)>;
  45
  46 pub struct DocContext<'a, 'tcx: 'a, 'rcx: 'a> {
  47     pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
  48     pub resolver: &'a RefCell<resolve::Resolver<'rcx>>,
  49     /// The stack of module NodeIds up till this point
  50     pub mod_ids: RefCell<Vec<NodeId>>,
  51     pub populated_all_crate_impls: Cell<bool>,
  52     // Note that external items for which `doc(hidden)` applies to are shown as
  53     // non-reachable while local items aren't. This is because we're reusing
  54     // the access levels from crateanalysis.
  55     /// Later on moved into `clean::Crate`
  56     pub access_levels: RefCell<AccessLevels<DefId>>,
  57     /// Later on moved into `html::render::CACHE_KEY`
  58     pub renderinfo: RefCell<RenderInfo>,
  59     /// Later on moved through `clean::Crate` into `html::render::CACHE_KEY`
  60     pub external_traits: RefCell<FxHashMap<DefId, clean::Trait>>,
  61     /// Used while populating `external_traits` to ensure we don't process the same trait twice at
  62     /// the same time.
  63     pub active_extern_traits: RefCell<Vec<DefId>>,
  64     // The current set of type and lifetime substitutions,
  65     // for expanding type aliases at the HIR level:
  66
  67     /// Table type parameter definition -> substituted type
  68     pub ty_substs: RefCell<FxHashMap<Def, clean::Type>>,
  69     /// Table node id of lifetime parameter definition -> substituted lifetime
  70     pub lt_substs: RefCell<FxHashMap<DefId, clean::Lifetime>>,
  71 }
  72
  73 impl<'a, 'tcx, 'rcx> DocContext<'a, 'tcx, 'rcx> {
  74     pub fn sess(&self) -> &session::Session {
  75         &self.tcx.sess
  76     }
  77
  78     /// Call the closure with the given parameters set as
  79     /// the substitutions for a type alias' RHS.
  80     pub fn enter_alias<F, R>(&self,
  81                              ty_substs: FxHashMap<Def, clean::Type>,
  82                              lt_substs: FxHashMap<DefId, clean::Lifetime>,
  83                              f: F) -> R
  84     where F: FnOnce() -> R {
  85         let (old_tys, old_lts) =
  86             (mem::replace(&mut *self.ty_substs.borrow_mut(), ty_substs),
  87              mem::replace(&mut *self.lt_substs.borrow_mut(), lt_substs));
  88         let r = f();
  89         *self.ty_substs.borrow_mut() = old_tys;
  90         *self.lt_substs.borrow_mut() = old_lts;
  91         r
  92     }
  93 }
  94
  95 pub trait DocAccessLevels {
  96     fn is_doc_reachable(&self, did: DefId) -> bool;
  97 }
  98
  99 impl DocAccessLevels for AccessLevels<DefId> {
 100     fn is_doc_reachable(&self, did: DefId) -> bool {
 101         self.is_public(did)
 102     }
 103 }
 104
 105
 106 pub fn run_core(search_paths: SearchPaths,
 107                 cfgs: Vec<String>,
 108                 externs: config::Externs,
 109                 input: Input,
 110                 triple: Option<String>,
 111                 maybe_sysroot: Option<PathBuf>,
 112                 allow_warnings: bool,
 113                 force_unstable_if_unmarked: bool) -> (clean::Crate, RenderInfo)
 114 {
 115     // Parse, resolve, and typecheck the given crate.
 116
 117     let cpath = match input {
 118         Input::File(ref p) => Some(p.clone()),
 119         _ => None
 120     };
 121
 122     let warning_lint = lint::builtin::WARNINGS.name_lower();
 123
 124     let sessopts = config::Options {
 125         maybe_sysroot,
 126         search_paths,
 127         crate_types: vec![config::CrateTypeRlib],
 128         lint_opts: if !allow_warnings { vec![(warning_lint, lint::Allow)] } else { vec![] },
 129         lint_cap: Some(lint::Allow),
 130         externs,
 131         target_triple: triple.unwrap_or(config::host_triple().to_string()),
 132         // Ensure that rustdoc works even if rustc is feature-staged
 133         unstable_features: UnstableFeatures::Allow,
 134         actually_rustdoc: true,
 135         debugging_opts: config::DebuggingOptions {
 136             force_unstable_if_unmarked,
 137             ..config::basic_debugging_options()
 138         },
 139         ..config::basic_options().clone()
 140     };
 141
 142     let codemap = Rc::new(codemap::CodeMap::new(sessopts.file_path_mapping()));
 143     let diagnostic_handler = errors::Handler::with_tty_emitter(ColorConfig::Auto,
 144                                                                true,
 145                                                                false,
 146                                                                Some(codemap.clone()));
 147
 148     let mut sess = session::build_session_(
 149         sessopts, cpath, diagnostic_handler, codemap,
 150     );
 151     let trans = rustc_driver::get_trans(&sess);
 152     let cstore = Rc::new(CStore::new(trans.metadata_loader()));
 153     rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
 154
 155     let mut cfg = config::build_configuration(&sess, config::parse_cfgspecs(cfgs));
 156     target_features::add_configuration(&mut cfg, &sess, &*trans);
 157     sess.parse_sess.config = cfg;
 158
 159     let control = &driver::CompileController::basic();
 160
 161     let krate = panictry!(driver::phase_1_parse_input(control, &sess, &input));
 162
 163     let name = ::rustc_trans_utils::link::find_crate_name(Some(&sess), &krate.attrs, &input);
 164
 165     let mut crate_loader = CrateLoader::new(&sess, &cstore, &name);
 166
 167     let resolver_arenas = resolve::Resolver::arenas();
 168     let result = driver::phase_2_configure_and_expand_inner(&sess,
 169                                                       &cstore,
 170                                                       krate,
 171                                                       None,
 172                                                       &name,
 173                                                       None,
 174                                                       resolve::MakeGlobMap::No,
 175                                                       &resolver_arenas,
 176                                                       &mut crate_loader,
 177                                                       |_| Ok(()));
 178     let driver::InnerExpansionResult {
 179         mut hir_forest,
 180         resolver,
 181         ..
 182     } = abort_on_err(result, &sess);
 183
 184     // We need to hold on to the complete resolver, so we clone everything
 185     // for the analysis passes to use. Suboptimal, but necessary in the
 186     // current architecture.
 187     let defs = resolver.definitions.clone();
 188     let resolutions = ty::Resolutions {
 189         freevars: resolver.freevars.clone(),
 190         export_map: resolver.export_map.clone(),
 191         trait_map: resolver.trait_map.clone(),
 192         maybe_unused_trait_imports: resolver.maybe_unused_trait_imports.clone(),
 193         maybe_unused_extern_crates: resolver.maybe_unused_extern_crates.clone(),
 194     };
 195     let analysis = ty::CrateAnalysis {
 196         access_levels: Rc::new(AccessLevels::default()),
 197         name: name.to_string(),
 198         glob_map: if resolver.make_glob_map { Some(resolver.glob_map.clone()) } else { None },
 199     };
 200
 201     let arenas = AllArenas::new();
 202     let hir_map = hir_map::map_crate(&sess, &*cstore, &mut hir_forest, &defs);
 203     let output_filenames = driver::build_output_filenames(&input,
 204                                                           &None,
 205                                                           &None,
 206                                                           &[],
 207                                                           &sess);
 208
 209     let resolver = RefCell::new(resolver);
 210
 211     abort_on_err(driver::phase_3_run_analysis_passes(&*trans,
 212                                                      control,
 213                                                      &sess,
 214                                                      &*cstore,
 215                                                      hir_map,
 216                                                      analysis,
 217                                                      resolutions,
 218                                                      &arenas,
 219                                                      &name,
 220                                                      &output_filenames,
 221                                                      |tcx, analysis, _, result| {
 222         if let Err(_) = result {
 223             sess.fatal("Compilation failed, aborting rustdoc");
 224         }
 225
 226         let ty::CrateAnalysis { access_levels, .. } = analysis;
 227
 228         // Convert from a NodeId set to a DefId set since we don't always have easy access
 229         // to the map from defid -> nodeid
 230         let access_levels = AccessLevels {
 231             map: access_levels.map.iter()
 232                                   .map(|(&k, &v)| (tcx.hir.local_def_id(k), v))
 233                                   .collect()
 234         };
 235
 236         let ctxt = DocContext {
 237             tcx,
 238             resolver: &resolver,
 239             populated_all_crate_impls: Cell::new(false),
 240             access_levels: RefCell::new(access_levels),
 241             external_traits: Default::default(),
 242             active_extern_traits: Default::default(),
 243             renderinfo: Default::default(),
 244             ty_substs: Default::default(),
 245             lt_substs: Default::default(),
 246             mod_ids: Default::default(),
 247         };
 248         debug!("crate: {:?}", tcx.hir.krate());
 249
 250         let krate = {
 251             let mut v = RustdocVisitor::new(&*cstore, &ctxt);
 252             v.visit(tcx.hir.krate());
 253             v.clean(&ctxt)
 254         };
 255
 256         (krate, ctxt.renderinfo.into_inner())
 257     }), &sess)
 258 }