src/librustc_driver/driver.rs

   1 // Copyright 2012-2013 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::session::Session;
  12 use rustc::session::config::{self, Input, OutputFilenames};
  13 use rustc::session::search_paths::PathKind;
  14 use rustc::lint;
  15 use rustc::metadata::creader::CrateReader;
  16 use rustc::middle::{stability, ty, reachable};
  17 use rustc::middle::dependency_format;
  18 use rustc::middle;
  19 use rustc::plugin::load::Plugins;
  20 use rustc::plugin::registry::Registry;
  21 use rustc::plugin;
  22 use rustc::util::common::time;
  23 use rustc_borrowck as borrowck;
  24 use rustc_resolve as resolve;
  25 use rustc_trans::back::link;
  26 use rustc_trans::back::write;
  27 use rustc_trans::trans;
  28 use rustc_typeck as typeck;
  29
  30 use serialize::json;
  31
  32 use std::io;
  33 use std::io::fs;
  34 use std::os;
  35 use syntax::ast;
  36 use syntax::ast_map;
  37 use syntax::attr;
  38 use syntax::attr::{AttrMetaMethods};
  39 use syntax::diagnostics;
  40 use syntax::parse;
  41 use syntax::parse::token;
  42 use syntax;
  43
  44 pub fn compile_input(sess: Session,
  45                      cfg: ast::CrateConfig,
  46                      input: &Input,
  47                      outdir: &Option<Path>,
  48                      output: &Option<Path>,
  49                      addl_plugins: Option<Vec<String>>,
  50                      control: CompileController) {
  51     macro_rules! controller_entry_point{($point: ident, $make_state: expr) => ({
  52         {
  53             let state = $make_state;
  54             (control.$point.callback)(state);
  55         }
  56         if control.$point.stop {
  57             return;
  58         }
  59     })}
  60
  61     // We need nested scopes here, because the intermediate results can keep
  62     // large chunks of memory alive and we want to free them as soon as
  63     // possible to keep the peak memory usage low
  64     let (outputs, trans, sess) = {
  65         let (outputs, expanded_crate, id) = {
  66             let krate = phase_1_parse_input(&sess, cfg, input);
  67
  68             controller_entry_point!(after_parse,
  69                                     CompileState::state_after_parse(input,
  70                                                                     &sess,
  71                                                                     outdir,
  72                                                                     &krate));
  73
  74             let outputs = build_output_filenames(input,
  75                                                  outdir,
  76                                                  output,
  77                                                  &krate.attrs[],
  78                                                  &sess);
  79             let id = link::find_crate_name(Some(&sess),
  80                                            &krate.attrs[],
  81                                            input);
  82             let expanded_crate
  83                 = match phase_2_configure_and_expand(&sess,
  84                                                      krate,
  85                                                      &id[],
  86                                                      addl_plugins) {
  87                     None => return,
  88                     Some(k) => k
  89                 };
  90
  91             (outputs, expanded_crate, id)
  92         };
  93
  94         controller_entry_point!(after_expand,
  95                                 CompileState::state_after_expand(input,
  96                                                                  &sess,
  97                                                                  outdir,
  98                                                                  &expanded_crate,
  99                                                                  &id[]));
 100
 101         let mut forest = ast_map::Forest::new(expanded_crate);
 102         let ast_map = assign_node_ids_and_map(&sess, &mut forest);
 103
 104         write_out_deps(&sess, input, &outputs, &id[]);
 105
 106         let arenas = ty::CtxtArenas::new();
 107         let analysis = phase_3_run_analysis_passes(sess,
 108                                                    ast_map,
 109                                                    &arenas,
 110                                                    id,
 111                                                    control.make_glob_map);
 112
 113         controller_entry_point!(after_analysis,
 114                                 CompileState::state_after_analysis(input,
 115                                                                    &analysis.ty_cx.sess,
 116                                                                    outdir,
 117                                                                    analysis.ty_cx.map.krate(),
 118                                                                    &analysis,
 119                                                                    &analysis.ty_cx));
 120
 121         if log_enabled!(::log::INFO) {
 122             println!("Pre-trans");
 123             analysis.ty_cx.print_debug_stats();
 124         }
 125         let (tcx, trans) = phase_4_translate_to_llvm(analysis);
 126
 127         if log_enabled!(::log::INFO) {
 128             println!("Post-trans");
 129             tcx.print_debug_stats();
 130         }
 131
 132         // Discard interned strings as they are no longer required.
 133         token::get_ident_interner().clear();
 134
 135         (outputs, trans, tcx.sess)
 136     };
 137     phase_5_run_llvm_passes(&sess, &trans, &outputs);
 138
 139     controller_entry_point!(after_llvm,
 140                             CompileState::state_after_llvm(input,
 141                                                            &sess,
 142                                                            outdir,
 143                                                            &trans));
 144
 145     phase_6_link_output(&sess, &trans, &outputs);
 146 }
 147
 148 /// The name used for source code that doesn't originate in a file
 149 /// (e.g. source from stdin or a string)
 150 pub fn anon_src() -> String {
 151     "<anon>".to_string()
 152 }
 153
 154 pub fn source_name(input: &Input) -> String {
 155     match *input {
 156         // FIXME (#9639): This needs to handle non-utf8 paths
 157         Input::File(ref ifile) => ifile.as_str().unwrap().to_string(),
 158         Input::Str(_) => anon_src()
 159     }
 160 }
 161
 162 /// CompileController is used to customise compilation, it allows compilation to
 163 /// be stopped and/or to call arbitrary code at various points in compilation.
 164 /// It also allows for various flags to be set to influence what information gets
 165 /// colelcted during compilation.
 166 ///
 167 /// This is a somewhat higher level controller than a Session - the Session
 168 /// controls what happens in each phase, whereas the CompileController controls
 169 /// whether a phase is run at all and whether other code (from outside the
 170 /// the compiler) is run between phases.
 171 ///
 172 /// Note that if compilation is set to stop and a callback is provided for a
 173 /// given entry point, the callback is called before compilation is stopped.
 174 ///
 175 /// Expect more entry points to be added in the future.
 176 pub struct CompileController<'a> {
 177     pub after_parse: PhaseController<'a>,
 178     pub after_expand: PhaseController<'a>,
 179     pub after_analysis: PhaseController<'a>,
 180     pub after_llvm: PhaseController<'a>,
 181
 182     pub make_glob_map: resolve::MakeGlobMap,
 183 }
 184
 185 impl<'a> CompileController<'a> {
 186     pub fn basic() -> CompileController<'a> {
 187         CompileController {
 188             after_parse: PhaseController::basic(),
 189             after_expand: PhaseController::basic(),
 190             after_analysis: PhaseController::basic(),
 191             after_llvm: PhaseController::basic(),
 192             make_glob_map: resolve::MakeGlobMap::No,
 193         }
 194     }
 195 }
 196
 197 pub struct PhaseController<'a> {
 198     pub stop: bool,
 199     pub callback: Box<Fn(CompileState) -> () + 'a>,
 200 }
 201
 202 impl<'a> PhaseController<'a> {
 203     pub fn basic() -> PhaseController<'a> {
 204         PhaseController {
 205             stop: false,
 206             callback: box |&: _| {},
 207         }
 208     }
 209 }
 210
 211 /// State that is passed to a callback. What state is available depends on when
 212 /// during compilation the callback is made. See the various constructor methods
 213 /// (`state_*`) in the impl to see which data is provided for any given entry point.
 214 pub struct CompileState<'a, 'ast: 'a, 'tcx: 'a> {
 215     pub input: &'a Input,
 216     pub session: &'a Session,
 217     pub cfg: Option<&'a ast::CrateConfig>,
 218     pub krate: Option<&'a ast::Crate>,
 219     pub crate_name: Option<&'a str>,
 220     pub output_filenames: Option<&'a OutputFilenames>,
 221     pub out_dir: Option<&'a Path>,
 222     pub expanded_crate: Option<&'a ast::Crate>,
 223     pub ast_map: Option<&'a ast_map::Map<'ast>>,
 224     pub analysis: Option<&'a ty::CrateAnalysis<'tcx>>,
 225     pub tcx: Option<&'a ty::ctxt<'tcx>>,
 226     pub trans: Option<&'a trans::CrateTranslation>,
 227 }
 228
 229 impl<'a, 'ast, 'tcx> CompileState<'a, 'ast, 'tcx> {
 230     fn empty(input: &'a Input,
 231              session: &'a Session,
 232              out_dir: &'a Option<Path>)
 233              -> CompileState<'a, 'ast, 'tcx> {
 234         CompileState {
 235             input: input,
 236             session: session,
 237             out_dir: out_dir.as_ref(),
 238             cfg: None,
 239             krate: None,
 240             crate_name: None,
 241             output_filenames: None,
 242             expanded_crate: None,
 243             ast_map: None,
 244             analysis: None,
 245             tcx: None,
 246             trans: None,
 247         }
 248     }
 249
 250     fn state_after_parse(input: &'a Input,
 251                          session: &'a Session,
 252                          out_dir: &'a Option<Path>,
 253                          krate: &'a ast::Crate)
 254                          -> CompileState<'a, 'ast, 'tcx> {
 255         CompileState {
 256             krate: Some(krate),
 257             .. CompileState::empty(input, session, out_dir)
 258         }
 259     }
 260
 261     fn state_after_expand(input: &'a Input,
 262                           session: &'a Session,
 263                           out_dir: &'a Option<Path>,
 264                           expanded_crate: &'a ast::Crate,
 265                           crate_name: &'a str)
 266                           -> CompileState<'a, 'ast, 'tcx> {
 267         CompileState {
 268             crate_name: Some(crate_name),
 269             expanded_crate: Some(expanded_crate),
 270             .. CompileState::empty(input, session, out_dir)
 271         }
 272     }
 273
 274     fn state_after_analysis(input: &'a Input,
 275                             session: &'a Session,
 276                             out_dir: &'a Option<Path>,
 277                             krate: &'a ast::Crate,
 278                             analysis: &'a ty::CrateAnalysis<'tcx>,
 279                             tcx: &'a ty::ctxt<'tcx>)
 280                             -> CompileState<'a, 'ast, 'tcx> {
 281         CompileState {
 282             analysis: Some(analysis),
 283             tcx: Some(tcx),
 284             krate: Some(krate),
 285             .. CompileState::empty(input, session, out_dir)
 286         }
 287     }
 288
 289
 290     fn state_after_llvm(input: &'a Input,
 291                         session: &'a Session,
 292                         out_dir: &'a Option<Path>,
 293                         trans: &'a trans::CrateTranslation)
 294                         -> CompileState<'a, 'ast, 'tcx> {
 295         CompileState {
 296             trans: Some(trans),
 297             .. CompileState::empty(input, session, out_dir)
 298         }
 299     }
 300 }
 301
 302 pub fn phase_1_parse_input(sess: &Session, cfg: ast::CrateConfig, input: &Input)
 303     -> ast::Crate {
 304     // These may be left in an incoherent state after a previous compile.
 305     // `clear_tables` and `get_ident_interner().clear()` can be used to free
 306     // memory, but they do not restore the initial state.
 307     syntax::ext::mtwt::reset_tables();
 308     token::reset_ident_interner();
 309
 310     let krate = time(sess.time_passes(), "parsing", (), |_| {
 311         match *input {
 312             Input::File(ref file) => {
 313                 parse::parse_crate_from_file(&(*file), cfg.clone(), &sess.parse_sess)
 314             }
 315             Input::Str(ref src) => {
 316                 parse::parse_crate_from_source_str(anon_src().to_string(),
 317                                                    src.to_string(),
 318                                                    cfg.clone(),
 319                                                    &sess.parse_sess)
 320             }
 321         }
 322     });
 323
 324     if sess.opts.debugging_opts.ast_json_noexpand {
 325         println!("{}", json::as_json(&krate));
 326     }
 327
 328     if let Some(ref s) = sess.opts.show_span {
 329         syntax::show_span::run(sess.diagnostic(), s.as_slice(), &krate);
 330     }
 331
 332     krate
 333 }
 334
 335 // For continuing compilation after a parsed crate has been
 336 // modified
 337
 338 /// Run the "early phases" of the compiler: initial `cfg` processing,
 339 /// loading compiler plugins (including those from `addl_plugins`),
 340 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
 341 /// harness if one is to be provided and injection of a dependency on the
 342 /// standard library and prelude.
 343 ///
 344 /// Returns `None` if we're aborting after handling -W help.
 345 pub fn phase_2_configure_and_expand(sess: &Session,
 346                                     mut krate: ast::Crate,
 347                                     crate_name: &str,
 348                                     addl_plugins: Option<Vec<String>>)
 349                                     -> Option<ast::Crate> {
 350     let time_passes = sess.time_passes();
 351
 352     *sess.crate_types.borrow_mut() =
 353         collect_crate_types(sess, &krate.attrs[]);
 354     *sess.crate_metadata.borrow_mut() =
 355         collect_crate_metadata(sess, &krate.attrs[]);
 356
 357     time(time_passes, "recursion limit", (), |_| {
 358         middle::recursion_limit::update_recursion_limit(sess, &krate);
 359     });
 360
 361     // strip before expansion to allow macros to depend on
 362     // configuration variables e.g/ in
 363     //
 364     //   #[macro_use] #[cfg(foo)]
 365     //   mod bar { macro_rules! baz!(() => {{}}) }
 366     //
 367     // baz! should not use this definition unless foo is enabled.
 368
 369     time(time_passes, "gated macro checking", (), |_| {
 370         let (features, unknown_features) =
 371             syntax::feature_gate::check_crate_macros(sess.codemap(),
 372                                                      &sess.parse_sess.span_diagnostic,
 373                                                      &krate);
 374         for uf in unknown_features.iter() {
 375             sess.add_lint(lint::builtin::UNKNOWN_FEATURES,
 376                           ast::CRATE_NODE_ID,
 377                           *uf,
 378                           "unknown feature".to_string());
 379         }
 380
 381         // these need to be set "early" so that expansion sees `quote` if enabled.
 382         *sess.features.borrow_mut() = features;
 383         sess.abort_if_errors();
 384     });
 385
 386     krate = time(time_passes, "configuration 1", krate, |krate|
 387                  syntax::config::strip_unconfigured_items(sess.diagnostic(), krate));
 388
 389     krate = time(time_passes, "crate injection", krate, |krate|
 390                  syntax::std_inject::maybe_inject_crates_ref(krate,
 391                                                              sess.opts.alt_std_name.clone()));
 392
 393     let mut addl_plugins = Some(addl_plugins);
 394     let Plugins { macros, registrars }
 395         = time(time_passes, "plugin loading", (), |_|
 396                plugin::load::load_plugins(sess, &krate, addl_plugins.take().unwrap()));
 397
 398     let mut registry = Registry::new(sess, &krate);
 399
 400     time(time_passes, "plugin registration", registrars, |registrars| {
 401         if sess.features.borrow().rustc_diagnostic_macros {
 402             registry.register_macro("__diagnostic_used",
 403                 diagnostics::plugin::expand_diagnostic_used);
 404             registry.register_macro("__register_diagnostic",
 405                 diagnostics::plugin::expand_register_diagnostic);
 406             registry.register_macro("__build_diagnostic_array",
 407                 diagnostics::plugin::expand_build_diagnostic_array);
 408         }
 409
 410         for registrar in registrars.into_iter() {
 411             registry.args_hidden = Some(registrar.args);
 412             (registrar.fun)(&mut registry);
 413         }
 414     });
 415
 416     let Registry { syntax_exts, lint_passes, lint_groups, .. } = registry;
 417
 418     {
 419         let mut ls = sess.lint_store.borrow_mut();
 420         for pass in lint_passes.into_iter() {
 421             ls.register_pass(Some(sess), true, pass);
 422         }
 423
 424         for (name, to) in lint_groups.into_iter() {
 425             ls.register_group(Some(sess), true, name, to);
 426         }
 427     }
 428
 429     // Lint plugins are registered; now we can process command line flags.
 430     if sess.opts.describe_lints {
 431         super::describe_lints(&*sess.lint_store.borrow(), true);
 432         return None;
 433     }
 434     sess.lint_store.borrow_mut().process_command_line(sess);
 435
 436     // Abort if there are errors from lint processing or a plugin registrar.
 437     sess.abort_if_errors();
 438
 439     krate = time(time_passes, "expansion", (krate, macros, syntax_exts),
 440         |(krate, macros, syntax_exts)| {
 441             // Windows dlls do not have rpaths, so they don't know how to find their
 442             // dependencies. It's up to us to tell the system where to find all the
 443             // dependent dlls. Note that this uses cfg!(windows) as opposed to
 444             // targ_cfg because syntax extensions are always loaded for the host
 445             // compiler, not for the target.
 446             let mut _old_path = String::new();
 447             if cfg!(windows) {
 448                 _old_path = os::getenv("PATH").unwrap_or(_old_path);
 449                 let mut new_path = sess.host_filesearch(PathKind::All).get_dylib_search_paths();
 450                 new_path.extend(os::split_paths(&_old_path[]).into_iter());
 451                 os::setenv("PATH", os::join_paths(&new_path[]).unwrap());
 452             }
 453             let cfg = syntax::ext::expand::ExpansionConfig {
 454                 crate_name: crate_name.to_string(),
 455                 enable_quotes: sess.features.borrow().quote,
 456                 recursion_limit: sess.recursion_limit.get(),
 457             };
 458             let ret = syntax::ext::expand::expand_crate(&sess.parse_sess,
 459                                               cfg,
 460                                               macros,
 461                                               syntax_exts,
 462                                               krate);
 463             if cfg!(windows) {
 464                 os::setenv("PATH", _old_path);
 465             }
 466             ret
 467         }
 468     );
 469
 470     // Needs to go *after* expansion to be able to check the results of macro expansion.
 471     time(time_passes, "complete gated feature checking", (), |_| {
 472         syntax::feature_gate::check_crate(sess.codemap(),
 473                                           &sess.parse_sess.span_diagnostic,
 474                                           &krate);
 475         sess.abort_if_errors();
 476     });
 477
 478     // JBC: make CFG processing part of expansion to avoid this problem:
 479
 480     // strip again, in case expansion added anything with a #[cfg].
 481     krate = time(time_passes, "configuration 2", krate, |krate|
 482                  syntax::config::strip_unconfigured_items(sess.diagnostic(), krate));
 483
 484     krate = time(time_passes, "maybe building test harness", krate, |krate|
 485                  syntax::test::modify_for_testing(&sess.parse_sess,
 486                                                   &sess.opts.cfg,
 487                                                   krate,
 488                                                   sess.diagnostic()));
 489
 490     krate = time(time_passes, "prelude injection", krate, |krate|
 491                  syntax::std_inject::maybe_inject_prelude(krate));
 492
 493     time(time_passes, "checking that all macro invocations are gone", &krate, |krate|
 494          syntax::ext::expand::check_for_macros(&sess.parse_sess, krate));
 495
 496     Some(krate)
 497 }
 498
 499 pub fn assign_node_ids_and_map<'ast>(sess: &Session,
 500                                      forest: &'ast mut ast_map::Forest)
 501                                      -> ast_map::Map<'ast> {
 502     struct NodeIdAssigner<'a> {
 503         sess: &'a Session
 504     }
 505
 506     impl<'a> ast_map::FoldOps for NodeIdAssigner<'a> {
 507         fn new_id(&self, old_id: ast::NodeId) -> ast::NodeId {
 508             assert_eq!(old_id, ast::DUMMY_NODE_ID);
 509             self.sess.next_node_id()
 510         }
 511     }
 512
 513     let map = time(sess.time_passes(), "assigning node ids and indexing ast", forest, |forest|
 514                    ast_map::map_crate(forest, NodeIdAssigner { sess: sess }));
 515
 516     if sess.opts.debugging_opts.ast_json {
 517         println!("{}", json::as_json(map.krate()));
 518     }
 519
 520     map
 521 }
 522
 523 /// Run the resolution, typechecking, region checking and other
 524 /// miscellaneous analysis passes on the crate. Return various
 525 /// structures carrying the results of the analysis.
 526 pub fn phase_3_run_analysis_passes<'tcx>(sess: Session,
 527                                          ast_map: ast_map::Map<'tcx>,
 528                                          arenas: &'tcx ty::CtxtArenas<'tcx>,
 529                                          name: String,
 530                                          make_glob_map: resolve::MakeGlobMap)
 531                                          -> ty::CrateAnalysis<'tcx> {
 532     let time_passes = sess.time_passes();
 533     let krate = ast_map.krate();
 534
 535     time(time_passes, "external crate/lib resolution", (), |_|
 536          CrateReader::new(&sess).read_crates(krate));
 537
 538     let lang_items = time(time_passes, "language item collection", (), |_|
 539                           middle::lang_items::collect_language_items(krate, &sess));
 540
 541     let resolve::CrateMap {
 542         def_map,
 543         freevars,
 544         capture_mode_map,
 545         export_map,
 546         trait_map,
 547         external_exports,
 548         last_private_map,
 549         glob_map,
 550     } =
 551         time(time_passes, "resolution", (),
 552              |_| resolve::resolve_crate(&sess,
 553                                         &ast_map,
 554                                         &lang_items,
 555                                         krate,
 556                                         make_glob_map));
 557
 558     // Discard MTWT tables that aren't required past resolution.
 559     syntax::ext::mtwt::clear_tables();
 560
 561     let named_region_map = time(time_passes, "lifetime resolution", (),
 562                                 |_| middle::resolve_lifetime::krate(&sess, krate, &def_map));
 563
 564     time(time_passes, "looking for entry point", (),
 565          |_| middle::entry::find_entry_point(&sess, &ast_map));
 566
 567     sess.plugin_registrar_fn.set(
 568         time(time_passes, "looking for plugin registrar", (), |_|
 569             plugin::build::find_plugin_registrar(
 570                 sess.diagnostic(), krate)));
 571
 572     let region_map = time(time_passes, "region resolution", (), |_|
 573                           middle::region::resolve_crate(&sess, krate));
 574
 575     time(time_passes, "loop checking", (), |_|
 576          middle::check_loop::check_crate(&sess, krate));
 577
 578     let stability_index = time(time_passes, "stability index", (), |_|
 579                                stability::Index::build(krate));
 580
 581     time(time_passes, "static item recursion checking", (), |_|
 582          middle::check_static_recursion::check_crate(&sess, krate, &def_map, &ast_map));
 583
 584     let ty_cx = ty::mk_ctxt(sess,
 585                             arenas,
 586                             def_map,
 587                             named_region_map,
 588                             ast_map,
 589                             freevars,
 590                             capture_mode_map,
 591                             region_map,
 592                             lang_items,
 593                             stability_index);
 594
 595     // passes are timed inside typeck
 596     typeck::check_crate(&ty_cx, trait_map);
 597
 598     time(time_passes, "check static items", (), |_|
 599          middle::check_static::check_crate(&ty_cx));
 600
 601     // These next two const passes can probably be merged
 602     time(time_passes, "const marking", (), |_|
 603          middle::const_eval::process_crate(&ty_cx));
 604
 605     time(time_passes, "const checking", (), |_|
 606          middle::check_const::check_crate(&ty_cx));
 607
 608     let maps = (external_exports, last_private_map);
 609     let (exported_items, public_items) =
 610             time(time_passes, "privacy checking", maps, |(a, b)|
 611                  middle::privacy::check_crate(&ty_cx, &export_map, a, b));
 612
 613     time(time_passes, "intrinsic checking", (), |_|
 614          middle::intrinsicck::check_crate(&ty_cx));
 615
 616     time(time_passes, "effect checking", (), |_|
 617          middle::effect::check_crate(&ty_cx));
 618
 619     time(time_passes, "match checking", (), |_|
 620          middle::check_match::check_crate(&ty_cx));
 621
 622     time(time_passes, "liveness checking", (), |_|
 623          middle::liveness::check_crate(&ty_cx));
 624
 625     time(time_passes, "borrow checking", (), |_|
 626          borrowck::check_crate(&ty_cx));
 627
 628     time(time_passes, "rvalue checking", (), |_|
 629          middle::check_rvalues::check_crate(&ty_cx, krate));
 630
 631     // Avoid overwhelming user with errors if type checking failed.
 632     // I'm not sure how helpful this is, to be honest, but it avoids a
 633     // lot of annoying errors in the compile-fail tests (basically,
 634     // lint warnings and so on -- kindck used to do this abort, but
 635     // kindck is gone now). -nmatsakis
 636     ty_cx.sess.abort_if_errors();
 637
 638     let reachable_map =
 639         time(time_passes, "reachability checking", (), |_|
 640              reachable::find_reachable(&ty_cx, &exported_items));
 641
 642     time(time_passes, "death checking", (), |_| {
 643         middle::dead::check_crate(&ty_cx,
 644                                   &exported_items,
 645                                   &reachable_map)
 646     });
 647
 648     time(time_passes, "lint checking", (), |_|
 649          lint::check_crate(&ty_cx, &exported_items));
 650
 651     ty::CrateAnalysis {
 652         export_map: export_map,
 653         ty_cx: ty_cx,
 654         exported_items: exported_items,
 655         public_items: public_items,
 656         reachable: reachable_map,
 657         name: name,
 658         glob_map: glob_map,
 659     }
 660 }
 661
 662 /// Run the translation phase to LLVM, after which the AST and analysis can
 663 /// be discarded.
 664 pub fn phase_4_translate_to_llvm<'tcx>(analysis: ty::CrateAnalysis<'tcx>)
 665                                        -> (ty::ctxt<'tcx>, trans::CrateTranslation) {
 666     let time_passes = analysis.ty_cx.sess.time_passes();
 667
 668     time(time_passes, "resolving dependency formats", (), |_|
 669          dependency_format::calculate(&analysis.ty_cx));
 670
 671     // Option dance to work around the lack of stack once closures.
 672     time(time_passes, "translation", analysis, |analysis|
 673          trans::trans_crate(analysis))
 674 }
 675
 676 /// Run LLVM itself, producing a bitcode file, assembly file or object file
 677 /// as a side effect.
 678 pub fn phase_5_run_llvm_passes(sess: &Session,
 679                                trans: &trans::CrateTranslation,
 680                                outputs: &OutputFilenames) {
 681     if sess.opts.cg.no_integrated_as {
 682         let output_type = config::OutputTypeAssembly;
 683
 684         time(sess.time_passes(), "LLVM passes", (), |_|
 685             write::run_passes(sess, trans, &[output_type], outputs));
 686
 687         write::run_assembler(sess, outputs);
 688
 689         // Remove assembly source, unless --save-temps was specified
 690         if !sess.opts.cg.save_temps {
 691             fs::unlink(&outputs.temp_path(config::OutputTypeAssembly)).unwrap();
 692         }
 693     } else {
 694         time(sess.time_passes(), "LLVM passes", (), |_|
 695             write::run_passes(sess,
 696                               trans,
 697                               &sess.opts.output_types[],
 698                               outputs));
 699     }
 700
 701     sess.abort_if_errors();
 702 }
 703
 704 /// Run the linker on any artifacts that resulted from the LLVM run.
 705 /// This should produce either a finished executable or library.
 706 pub fn phase_6_link_output(sess: &Session,
 707                            trans: &trans::CrateTranslation,
 708                            outputs: &OutputFilenames) {
 709     let old_path = os::getenv("PATH").unwrap_or_else(||String::new());
 710     let mut new_path = sess.host_filesearch(PathKind::All).get_tools_search_paths();
 711     new_path.extend(os::split_paths(&old_path[]).into_iter());
 712     os::setenv("PATH", os::join_paths(&new_path[]).unwrap());
 713
 714     time(sess.time_passes(), "linking", (), |_|
 715          link::link_binary(sess,
 716                            trans,
 717                            outputs,
 718                            &trans.link.crate_name[]));
 719
 720     os::setenv("PATH", old_path);
 721 }
 722
 723 fn escape_dep_filename(filename: &str) -> String {
 724     // Apparently clang and gcc *only* escape spaces:
 725     // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
 726     filename.replace(" ", "\\ ")
 727 }
 728
 729 fn write_out_deps(sess: &Session,
 730                   input: &Input,
 731                   outputs: &OutputFilenames,
 732                   id: &str) {
 733
 734     let mut out_filenames = Vec::new();
 735     for output_type in sess.opts.output_types.iter() {
 736         let file = outputs.path(*output_type);
 737         match *output_type {
 738             config::OutputTypeExe => {
 739                 for output in sess.crate_types.borrow().iter() {
 740                     let p = link::filename_for_input(sess, *output,
 741                                                      id, &file);
 742                     out_filenames.push(p);
 743                 }
 744             }
 745             _ => { out_filenames.push(file); }
 746         }
 747     }
 748
 749     // Write out dependency rules to the dep-info file if requested with
 750     // --dep-info
 751     let deps_filename = match sess.opts.write_dependency_info {
 752         // Use filename from --dep-file argument if given
 753         (true, Some(ref filename)) => filename.clone(),
 754         // Use default filename: crate source filename with extension replaced
 755         // by ".d"
 756         (true, None) => match *input {
 757             Input::File(..) => outputs.with_extension("d"),
 758             Input::Str(..) => {
 759                 sess.warn("can not write --dep-info without a filename \
 760                            when compiling stdin.");
 761                 return
 762             },
 763         },
 764         _ => return,
 765     };
 766
 767     let result = (|&:| -> io::IoResult<()> {
 768         // Build a list of files used to compile the output and
 769         // write Makefile-compatible dependency rules
 770         let files: Vec<String> = sess.codemap().files.borrow()
 771                                    .iter().filter(|fmap| fmap.is_real_file())
 772                                    .map(|fmap| escape_dep_filename(&fmap.name[]))
 773                                    .collect();
 774         let mut file = try!(io::File::create(&deps_filename));
 775         for path in out_filenames.iter() {
 776             try!(write!(&mut file as &mut Writer,
 777                           "{}: {}\n\n", path.display(), files.connect(" ")));
 778         }
 779         Ok(())
 780     })();
 781
 782     match result {
 783         Ok(()) => {}
 784         Err(e) => {
 785             sess.fatal(&format!("error writing dependencies to `{}`: {}",
 786                                deps_filename.display(), e)[]);
 787         }
 788     }
 789 }
 790
 791 pub fn collect_crate_types(session: &Session,
 792                            attrs: &[ast::Attribute]) -> Vec<config::CrateType> {
 793     // Unconditionally collect crate types from attributes to make them used
 794     let attr_types: Vec<config::CrateType> = attrs.iter().filter_map(|a| {
 795         if a.check_name("crate_type") {
 796             match a.value_str() {
 797                 Some(ref n) if *n == "rlib" => {
 798                     Some(config::CrateTypeRlib)
 799                 }
 800                 Some(ref n) if *n == "dylib" => {
 801                     Some(config::CrateTypeDylib)
 802                 }
 803                 Some(ref n) if *n == "lib" => {
 804                     Some(config::default_lib_output())
 805                 }
 806                 Some(ref n) if *n == "staticlib" => {
 807                     Some(config::CrateTypeStaticlib)
 808                 }
 809                 Some(ref n) if *n == "bin" => Some(config::CrateTypeExecutable),
 810                 Some(_) => {
 811                     session.add_lint(lint::builtin::UNKNOWN_CRATE_TYPES,
 812                                      ast::CRATE_NODE_ID,
 813                                      a.span,
 814                                      "invalid `crate_type` \
 815                                       value".to_string());
 816                     None
 817                 }
 818                 _ => {
 819                     session.add_lint(lint::builtin::UNKNOWN_CRATE_TYPES,
 820                                      ast::CRATE_NODE_ID,
 821                                      a.span,
 822                                      "`crate_type` requires a \
 823                                       value".to_string());
 824                     None
 825                 }
 826             }
 827         } else {
 828             None
 829         }
 830     }).collect();
 831
 832     // If we're generating a test executable, then ignore all other output
 833     // styles at all other locations
 834     if session.opts.test {
 835         return vec!(config::CrateTypeExecutable)
 836     }
 837
 838     // Only check command line flags if present. If no types are specified by
 839     // command line, then reuse the empty `base` Vec to hold the types that
 840     // will be found in crate attributes.
 841     let mut base = session.opts.crate_types.clone();
 842     if base.len() == 0 {
 843         base.extend(attr_types.into_iter());
 844         if base.len() == 0 {
 845             base.push(link::default_output_for_target(session));
 846         }
 847         base.sort();
 848         base.dedup();
 849     }
 850
 851     base.into_iter().filter(|crate_type| {
 852         let res = !link::invalid_output_for_target(session, *crate_type);
 853
 854         if !res {
 855             session.warn(&format!("dropping unsupported crate type `{:?}` \
 856                                    for target `{}`",
 857                                  *crate_type, session.opts.target_triple)[]);
 858         }
 859
 860         res
 861     }).collect()
 862 }
 863
 864 pub fn collect_crate_metadata(session: &Session,
 865                               _attrs: &[ast::Attribute]) -> Vec<String> {
 866     session.opts.cg.metadata.clone()
 867 }
 868
 869 pub fn build_output_filenames(input: &Input,
 870                               odir: &Option<Path>,
 871                               ofile: &Option<Path>,
 872                               attrs: &[ast::Attribute],
 873                               sess: &Session)
 874                            -> OutputFilenames {
 875     match *ofile {
 876         None => {
 877             // "-" as input file will cause the parser to read from stdin so we
 878             // have to make up a name
 879             // We want to toss everything after the final '.'
 880             let dirpath = match *odir {
 881                 Some(ref d) => d.clone(),
 882                 None => Path::new(".")
 883             };
 884
 885             // If a crate name is present, we use it as the link name
 886             let stem = sess.opts.crate_name.clone().or_else(|| {
 887                 attr::find_crate_name(attrs).map(|n| n.get().to_string())
 888             }).unwrap_or(input.filestem());
 889
 890             OutputFilenames {
 891                 out_directory: dirpath,
 892                 out_filestem: stem,
 893                 single_output_file: None,
 894                 extra: sess.opts.cg.extra_filename.clone(),
 895             }
 896         }
 897
 898         Some(ref out_file) => {
 899             let ofile = if sess.opts.output_types.len() > 1 {
 900                 sess.warn("ignoring specified output filename because multiple \
 901                            outputs were requested");
 902                 None
 903             } else {
 904                 Some(out_file.clone())
 905             };
 906             if *odir != None {
 907                 sess.warn("ignoring --out-dir flag due to -o flag.");
 908             }
 909             OutputFilenames {
 910                 out_directory: out_file.dir_path(),
 911                 out_filestem: out_file.filestem_str().unwrap().to_string(),
 912                 single_output_file: ofile,
 913                 extra: sess.opts.cg.extra_filename.clone(),
 914             }
 915         }
 916     }
 917 }